WO2023193477A1 - Thermoelectric decoupling system used for heat supply unit, and method - Google Patents

Thermoelectric decoupling system used for heat supply unit, and method Download PDF

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Publication number
WO2023193477A1
WO2023193477A1 PCT/CN2022/140498 CN2022140498W WO2023193477A1 WO 2023193477 A1 WO2023193477 A1 WO 2023193477A1 CN 2022140498 W CN2022140498 W CN 2022140498W WO 2023193477 A1 WO2023193477 A1 WO 2023193477A1
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Prior art keywords
pressure cylinder
superheater
regulating valve
inlet
heating
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PCT/CN2022/140498
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French (fr)
Chinese (zh)
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王妍
许朋江
马汀山
吕凯
雒青
王宏武
黄嘉驷
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西安热工研究院有限公司
西安西热节能技术有限公司
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Publication of WO2023193477A1 publication Critical patent/WO2023193477A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]

Definitions

  • the present disclosure relates to the technical field of heating for coal-fired units, and in particular, to a thermoelectric decoupling system and method for heating units.
  • thermoelectric decoupling system and method for a heating unit.
  • thermoelectric decoupling system for a heating unit including a boiler, a superheater interstage heat exchanger, a steam turbine unit, a heating network heater, and a generator.
  • the boiler includes Primary superheater and secondary superheater, where,
  • the inlet of the first-level superheater is connected to the boiler feed water pipeline, and the outlet of the first-level superheater is connected in sequence to the shell side of the interstage heat exchanger of the superheater, the second-level superheater, the steam turbine unit and The shell side of the heating network heater;
  • the tube side of the heating network heater is connected to the heating network through a circulation pipeline;
  • the tube side outlet of the heating network heater is connected to the shell side inlet of the superheater interstage heat exchanger, and the shell side outlet of the superheater interstage heat exchanger is connected to the heating network water supply pipeline of the heating network. connect;
  • the steam turbine unit is connected to the engine through a transmission shaft;
  • the superheater interstage heat exchanger is used to supplement the heating network water by utilizing the thermal energy generated in the boiler.
  • the system further includes a first regulating valve, wherein,
  • One end of the first regulating valve is connected to the pipe side outlet of the heat network heater
  • the other end of the first regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
  • the steam turbine unit includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, wherein,
  • the high-pressure cylinder is connected to the medium-pressure cylinder, the low-pressure cylinder and the generator in sequence through a transmission shaft;
  • the outlet of the secondary superheater is connected to the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence;
  • the outlet of the medium-pressure cylinder is connected with the shell-side inlet of the heat network heater.
  • the boiler further includes a primary reheater, a secondary reheater and a reheater interstage heat exchanger, wherein,
  • the outlet of the high-pressure cylinder is connected in sequence to the first-stage reheater, the reheater interstage heat exchanger, the second-stage reheater and the inlet of the medium-pressure cylinder;
  • the tube side outlet of the heat network heater is connected to the shell side inlet of the reheater interstage heat exchanger;
  • the shell-side outlet of the reheater interstage heat exchanger is connected to the water supply pipeline of the heating network.
  • the system further includes a second regulating valve, wherein,
  • One end of the second regulating valve is connected to the pipe side outlet of the heat network heater
  • the other end of the second regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
  • the system further includes a third regulating valve, wherein,
  • the third regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
  • the system further includes a condenser, a condensate pump, a low-pressure heater group, a deaerator, a feed water pump and a high-pressure heater group, wherein,
  • the outlet of the low-pressure cylinder is connected in sequence to the condenser, the condensate pump, the low-pressure heater group, the deaerator, the feed water pump and the high-pressure heater group;
  • the high-pressure heater group is connected to the inlet of the first-stage superheater through the boiler feed water pipeline;
  • the shell-side outlet of the heat network heater is connected with the inlet of the low-pressure heater group.
  • thermoelectric decoupling system for a heating unit as described in the first aspect includes:
  • control the first regulating valve and the second regulating valve In response to receiving the external heating instruction of the unit, control the first regulating valve and the second regulating valve to close, and control the third regulating valve to open;
  • the reheat steam target temperature value is compared with the current reheat steam temperature value, and the opening and closing angle of the second regulating valve is adjusted based on the comparison result.
  • Figure 1 is a schematic structural diagram of a thermoelectric decoupling system for a heating unit proposed in an embodiment of the present disclosure
  • FIG. 2 is a flow chart of a method for a thermoelectric decoupling system of a heating unit proposed in an embodiment of the present disclosure.
  • Figure 1 is a schematic structural diagram of a thermoelectric decoupling system for a heating unit proposed in an embodiment of the present disclosure.
  • thermoelectric decoupling system for heating units includes: boiler, superheater interstage heat exchanger 1, steam turbine unit and heating network heater 7, generator 14.
  • the boiler includes a first-stage superheater 3 and secondary superheater 4.
  • the inlet of the primary superheater 3 is connected to the boiler feed water pipeline, and the outlet of the primary superheater 3 is connected in turn to the tube side of the superheater interstage heat exchanger 1, the secondary superheater 4, the steam turbine unit and the heating network heater.
  • the tube side of the heating network heater 7 is connected to the heating network through a circulation pipeline; the tube side outlet of the heating network heater 7 is connected to the shell side inlet of the superheater interstage heat exchanger 1, and the superheater interstage
  • the shell side outlet of heat exchanger 1 is connected to the water supply pipeline of the heating network; the steam turbine unit is connected to the engine through the transmission shaft; the superheater interstage heat exchanger 1 is used to supplement the heating network water using the heat energy generated in the boiler Heating.
  • the system also includes a first regulating valve 8, where one end of the first regulating valve 8 is connected to the pipe side outlet of the heating network heater 7; the other end of the first regulating valve 8 is connected between the heating network heater 7 and the heating network water supply. on the pipes between pipes.
  • the above-mentioned tube side may be the side of the equipment used for transmitting high-pressure medium
  • the shell side may be the side of the equipment used for transmitting low-pressure medium.
  • the high-pressure medium can be steam or water
  • the low-pressure medium can be water or steam.
  • the steam in the steam turbine enters the heating network heater 7 from the steam turbine outlet, and exchanges heat with the return water of the heating network.
  • the heating network heater 7 transports the heated heating network return water to the superheater interstage heat exchanger 1 to exchange heat with the above-mentioned water vapor.
  • the heated heating network water enters the heating network through the heating network water supply pipeline.
  • the cooled water vapor enters the secondary superheater 4 for secondary heating.
  • the reheated steam enters the steam turbine unit to perform work, thus driving the generator 14 to generate electricity.
  • the steam turbine unit includes a high-pressure cylinder 11, an intermediate-pressure cylinder 12 and a low-pressure cylinder 13.
  • the high-pressure cylinder 11 is connected to the intermediate-pressure cylinder 12, the low-pressure cylinder 13 and the generator 14 in sequence through a transmission shaft; the outlet of the secondary superheater 4 is connected to the high-pressure cylinder in sequence.
  • Medium-pressure cylinder 12 and low-pressure cylinder 13; the outlet of the medium-pressure cylinder 12 is connected to the shell-side inlet of the heat network heater 7.
  • the steam from the secondary superheater 4 sequentially enters the high-pressure cylinder 11 , the intermediate-pressure cylinder 12 and the low-pressure cylinder 13 to perform work, thus driving the generator 14 to generate electricity, and part of the steam at the outlet of the intermediate-pressure cylinder 12 enters the heating network.
  • the heater 7 exchanges heat with the hot network water return water in the heating network heater 7, thereby heating the hot network water return water.
  • the boiler also includes a primary reheater 5, a secondary reheater 6 and a reheater interstage heat exchanger 2.
  • the outlet of the high-pressure cylinder 11 is connected to the primary reheater 5, the reheater interstage heat exchanger in turn.
  • the inlet of the reheater 2, the secondary reheater 6 and the medium pressure cylinder 12; the tube side outlet of the heat network heater 7 is connected to the shell side inlet of the reheater interstage heat exchanger 2; the reheater interstage heat exchanger
  • the shell side outlet of 2 is connected to the heating network water supply pipeline.
  • the system also includes a second regulating valve 9, wherein one end of the second regulating valve 9 is connected to the pipe side outlet of the heating network heater 7; the other end of the second regulating valve 9 is connected between the heating network heater 7 and the heating network water supply. on the pipes between pipes.
  • the steam is heated by the secondary superheater and then enters the high-pressure cylinder 11 to perform work, and then returns to the boiler for secondary heating.
  • the steam enters the first-stage reheater 5 from the high-pressure cylinder 11 for heating, and then enters the reheater interstage heat exchanger 2.
  • the heat network heater 7 returns the hot network water to the water.
  • the return water from the heating network exchanges heat with the steam and then returns to the heating network through the heating network water supply pipeline for external heating.
  • the above-mentioned steam enters the secondary reheater 6 and the medium-pressure cylinder 12 in sequence.
  • the hot network water exchanges heat with the main steam and reheated steam, thereby heating the hot network water, and then supplementing the heat supply to the heating network.
  • Heating can realize electrical load regulation through temperature control of steam without reducing the amount of steam entering the steam turbine, and realize supplementary heating of the heating network, which effectively improves the thermoelectric decoupling capability of the unit.
  • the system also includes a third regulating valve 10, wherein the third regulating valve 10 is connected on the pipeline between the heating network heater 7 and the heating network water supply pipeline.
  • the first regulating valve 8 and the second regulating valve 9 are closed, the third regulating valve 10 is opened, and the hot water network return water enters the heating network heater 7 and is connected with the medium pressure
  • the exhaust steam of cylinder 12 performs heat exchange, and the heated return water of the heating network returns to the heating network through the heating network water supply pipeline.
  • the first regulating valve 8 and the second regulating valve 9 are opened, so that part of the hot network water return water enters the superheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2, heat exchange with main steam and reheat steam. It can be understood that since the steam transfers part of its heat to the hot network water, the inlet steam temperature entering the turbine decreases.
  • the system also includes a condenser 15, a condensate pump 16, a low-pressure heater group 17, a deaerator 18, a feed water pump 19 and a high-pressure heater group 20.
  • the outlet of the low-pressure cylinder is connected to the condenser 15 and the condensate pump 16 in sequence.
  • the high-pressure heater group 20 is connected to the inlet of the primary superheater 3 through the boiler feed water pipeline; the shell side of the heat network heater 7
  • the outlet is connected with the inlet of the low-pressure heater group 17.
  • the steam sequentially enters the high-pressure cylinder 11, the medium-pressure cylinder 12, and the low-pressure cylinder 13 to perform work, thus driving the generator 14 to generate electricity.
  • the steam after performing the work sequentially enters the condenser 15, the condensate pump 16, and the low-pressure heater.
  • Group 17, deaerator 18, feed water pump 19 and high pressure heater group 20 finally return to the primary superheater 3 to complete the cycle.
  • Part of the exhaust steam from the medium-pressure cylinder 12 enters the heating network heater 7, exchanges heat with the hot network return water, and then enters the low-pressure heater group 17, and returns to the first stage of the boiler together with the steam output from the low-pressure cylinder 13.
  • thermoelectric decoupling system for the heating unit by using hot network water to deheat the main steam and reheated steam, on the one hand, the temperature of the heating network water supply is increased and the external heat supply of the unit is increased. On the other hand, the temperature of the superheated steam and reheated steam at the turbine inlet is reduced, thereby reducing the power generation of the unit.
  • This invention not only improves the heating capacity of the unit, but also reduces the electrical output of the unit and improves the flexibility of the unit's thermoelectric decoupling operation.
  • the accuracy of adjusting the temperature reduction range of the main steam and reheated steam can be effectively improved, thereby achieving flexible adjustment of the electrical load and thermal load of the unit.
  • FIG. 2 is a flow chart of a method for a thermoelectric decoupling system of a heating unit proposed in an embodiment of the present disclosure.
  • the method for a thermoelectric decoupling system of a heating unit includes steps 201 to 205 .
  • Step 201 In response to receiving an instruction to increase external heat supply, obtain the target heat load value.
  • the first regulating valve 8 and the second regulating valve 9 can be controlled to close, and the third regulating valve 10 can be controlled to open.
  • Step 202 Based on the target heat load value and the current electrical load value, determine the target temperature value of the main steam at the inlet of the high-pressure cylinder 11 and the target temperature value of the reheat steam at the inlet of the intermediate-pressure cylinder 12.
  • the main steam target temperature value at the inlet of the high-pressure cylinder 11 and the reheat steam target temperature at the inlet of the medium-pressure cylinder 12 corresponding to different target heat load values and electrical load values can be recorded in advance based on calculation analysis results or tests. value and the main steam flow value of the unit.
  • the main steam target temperature value at the inlet of the high-pressure cylinder 11 and the medium-pressure cylinder 12 corresponding to the target heat load value can be determined based on the target heat load value and the current electrical load value.
  • the target reheat steam temperature value at the inlet and the main steam flow rate value of the unit can be recorded in advance based on calculation analysis results or tests. value and the main steam flow value of the unit.
  • Step 203 Obtain the current main steam temperature value at the inlet of the high-pressure cylinder 11 and the current reheat steam temperature value at the inlet of the medium-pressure cylinder 12.
  • temperature sensors can be installed at the inlet of the high-pressure cylinder 11 and the inlet of the intermediate-pressure cylinder 12, and the current main steam temperature value at the inlet of the high-pressure cylinder 11 and the current reheat steam temperature at the inlet of the intermediate-pressure cylinder 12 are detected by the temperature sensor. value.
  • Step 204 Compare the main steam target temperature value with the current main steam temperature value, and adjust the opening and closing angle of the first regulating valve 8 based on the comparison result.
  • the main steam target temperature value is compared with the current main steam temperature value. The larger the difference, the larger the opening and closing angle of the first regulating valve 8 is adjusted.
  • Step 205 Compare the reheat steam target temperature value with the current reheat steam temperature value, and adjust the opening and closing angle of the second regulating valve 9 based on the comparison result.
  • the target temperature value of the reheated steam is compared with the current temperature value of the reheated steam. The larger the difference, the larger the opening and closing angle of the second regulating valve 9 is adjusted.
  • Turbine steam inlet valve As an example of possible implementation, you can also obtain the current unit main steam flow value and the main steam target flow value, compare the unit main steam target flow value with the current main steam flow value, and adjust the boiler feed water flow and flow rate based on the comparison results. Turbine steam inlet valve.
  • the unit supplies heat to the outside normally, the first regulating valve 8 and the second regulating valve 9 are closed, the third regulating valve 10 is fully opened, and the return water of the heating network circulating water enters the heating network heater 7 and is heated by the steam extracted by the unit. , and then sent to the heating network water supply pipeline.
  • the circulating water from the hot network heater 7 outlet enters the superheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2 and is further heated by the steam, and then is supplied to the outside.
  • the maximum heat supply of the unit is to the outside.
  • Q1 is the heat absorbed by the heating network circulating water in the superheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2.
  • W main steam is the main steam flow
  • W reheat steam is the reheat steam flow
  • W circulating water is the heating network circulating water flow
  • h T10 is the original main steam enthalpy value of the unit
  • h T20 is the original reheat steam enthalpy value of the unit
  • h T1 is the main steam enthalpy value at the turbine inlet after cooling
  • h T2 is the reheated steam enthalpy value at the turbine inlet after cooling
  • C P is the constant pressure specific heat capacity of water
  • T4 is the heating network circulating water supply temperature
  • T3 is the heating network heater 7 outlet Circulating water temperature.
  • the main and reheat steam temperatures T1 and T2 after cooling are determined by the openings of the first regulating valve 8 and the second regulating valve 9 .
  • the first regulating valve 8 and the second regulating valve 9 regulate the circulating water flow flowing through the preheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2, thereby controlling the main and reheat steam temperatures T1 and T2. adjust. Realize the adjustment of the unit's electrical load and external heat supply.
  • the main steam flow of the unit can be adjusted by adjusting the boiler feed water flow and the turbine steam inlet valve.
  • the maximum achievable cooling value T1max of the main steam is 15°C after the steam enters the high-pressure cylinder 11 to expand and perform work.
  • the maximum cooling value T2max that can be achieved by the reheated steam is that after the reheated steam enters the intermediate-pressure cylinder 12 to expand and perform work, the superheat degree of the exhaust steam from the intermediate-pressure cylinder 12 is 15°C.
  • This technical solution reduces the superheat of the steam at the inlet of the low-pressure cylinder 13 and avoids safety risks caused by excessive steam humidity in the flow area of the low-pressure cylinder 13. Therefore, this solution is suitable for low-pressure cylinder 13 zero-output heating units, optical axis heating units, Back-pressure heating units and other heating operation units in which the steam inlet flow of the low-pressure cylinder 13 is in a restricted state.
  • the unit's original design main steam pressure is 16.7MPa
  • the main steam and reheat steam temperatures are 538°C
  • the main steam flow rate is 1029t/h.
  • the external heat supply is 484MW
  • the unit's power generation load is 195MW.
  • the superheat degree of the high-discharge steam is controlled to 15°C
  • the temperature of the main steam after heat exchange and cooling is 460°C
  • the temperature of the reheat steam is 460°C
  • the power generation load of the unit is 166MW
  • the total external heat supply of the unit is 521MW.
  • the unit's electric output adjustment capacity is increased by 29MW
  • the heat supply is increased by 37MW.
  • the unit's original design main steam pressure is 24.2MPa
  • the main steam and reheat steam temperatures are 566°C
  • the main steam flow rate is 1029t/h.
  • the external heat supply is 964MW
  • the unit's power generation load is 388MW.
  • thermoelectric decoupling system of the heating unit by using hot network water to deheat the main steam and reheated steam, on the one hand, the temperature of the heating network water supply is increased, and the external supply of the unit is increased. heat; on the other hand, it reduces the temperature of the superheated steam and reheated steam at the turbine inlet, thereby reducing the power generation of the unit.
  • This invention not only improves the heating capacity of the unit, but also reduces the electrical output of the unit and improves the flexibility of the unit's thermoelectric decoupling operation.
  • the accuracy of adjusting the temperature reduction range of the main steam and reheated steam can be effectively improved, thereby achieving flexible adjustment of the electrical load and thermal load of the unit.
  • the present disclosure only realizes heat exchange between hot network water and boiler steam through the steam interstage heat exchanger, thereby achieving thermoelectric decoupling, with lower energy consumption and higher efficiency. Compared with electric boiler heating and heat storage tank heating, Technologies such as heat and heat pump heating effectively reduce operating costs.
  • first and second are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
  • connection In the present invention, unless otherwise clearly stated and limited, the terms “installation”, “connection”, “connection”, “fixing” and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanically connected, electrically connected or communicable with each other; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
  • a first feature being “on” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch.
  • the terms “above”, “above” and “above” the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature.
  • "Below”, “below” and “beneath” the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.
  • the terms “one embodiment,” “some embodiments,” “examples,” “specific examples,” or “some examples” mean specific features, structures, materials, or features described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

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Abstract

The present disclosure relates to a thermoelectric decoupling system used for a heat supply unit, and a method. A specific solution comprises: an inlet of a primary superheater being connected to a boiler feedwater pipe, an outlet of the primary superheater being successively connected to a pipe side of a superheater interstage heat exchanger, a secondary superheater, a steam turbine set and a casing side of a heat network heater, a pipe side of the heat network heater being connected to a heat network by means a circulation loop, a pipe side outlet of the heat network heater being connected to a casing side inlet of the superheater interstage heat exchanger, a casing side outlet of the superheater interstage heat exchanger being connected to a heat network water supply pipe of the heat network, the steam turbine set being connected to an engine by means of a drive shaft, and the superheater interstage heat exchanger being used for supplementing and supplying heat network water with heat by using heat energy generated in a boiler.

Description

一种用于供热机组的热电解耦***及方法A thermoelectric decoupling system and method for heating units
相关申请的交叉引用Cross-references to related applications
本申请基于申请号为202210364952.6、申请日为2022年4月7日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。This application is filed based on a Chinese patent application with application number 202210364952.6 and a filing date of April 7, 2022, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference into this application.
技术领域Technical field
本公开涉及燃煤机组供热技术领域，尤其涉及一种用于供热机组的热电解耦***及方法。The present disclosure relates to the technical field of heating for coal-fired units, and in particular, to a thermoelectric decoupling system and method for heating units.
背景技术Background technique
相关技术中，风电、光伏等可再生能源发电的规模和比重大幅提高，然而可再生能源具有波动性和间歇性等特点，接入电网后，需要其它机组增加调峰、调频等辅助服务的能力。在燃煤发电机组占据主体电源地位，同时大规模不稳定可再生能源亟待并网的双重背景下，煤电机组负荷调节能力亟待提高。对于供热机组，在采暖季，如何在满足供热的前提下，提升机组电出力调节能力，以满足民生保供要求，成为急需解决的问题。目前，部分电厂通过电锅炉供热、储热罐供热、热泵供热等技术手段，在一定程度上缓解了机组热电耦合、难以灵活运行的矛盾，但这些技术手段存在能耗较高、效率偏低、投资成本高等问题，一定程度上限制了其推广应用。Among related technologies, the scale and proportion of renewable energy power generation such as wind power and photovoltaics have increased significantly. However, renewable energy has characteristics such as volatility and intermittentness. After being connected to the power grid, other units are required to increase the capacity of auxiliary services such as peak shaving and frequency modulation. . Under the dual background of coal-fired power generation units occupying the main power source and large-scale unstable renewable energy urgently needing to be connected to the grid, the load regulation capabilities of coal power units need to be improved urgently. For heating units, during the heating season, how to improve the unit's power output adjustment capability on the premise of satisfying heating supply to meet people's livelihood and supply requirements has become an urgent problem. At present, some power plants use electric boiler heating, heat storage tank heating, heat pump heating and other technical means to alleviate the contradiction of thermal and electric coupling of units and difficulty in flexible operation to a certain extent. However, these technical means have high energy consumption and poor efficiency. Problems such as low cost and high investment cost limit its promotion and application to a certain extent.
发明内容Contents of the invention
为此，本公开提供一种用于供热机组的热电解耦***及方法。To this end, the present disclosure provides a thermoelectric decoupling system and method for a heating unit.
根据本公开实施例的第一方面，提供一种用于供热机组的热电解耦***，包括锅炉、过热器级间换热器、汽轮机组和热网加热器、发电机，所述锅炉包括一级过热器和二级过热器，其中，According to a first aspect of an embodiment of the present disclosure, a thermoelectric decoupling system for a heating unit is provided, including a boiler, a superheater interstage heat exchanger, a steam turbine unit, a heating network heater, and a generator. The boiler includes Primary superheater and secondary superheater, where,
所述一级过热器的入口与锅炉给水管路连接，所述一级过热器的出口依次连接所述过热器级间换热器的壳侧、所述二级过热器、所述汽轮机组和所述热网加热器的壳侧；The inlet of the first-level superheater is connected to the boiler feed water pipeline, and the outlet of the first-level superheater is connected in sequence to the shell side of the interstage heat exchanger of the superheater, the second-level superheater, the steam turbine unit and The shell side of the heating network heater;
所述热网加热器的管侧通过循环管路与热网连接；The tube side of the heating network heater is connected to the heating network through a circulation pipeline;
所述热网加热器的管侧出口与所述过热器级间换热器的壳侧入口连接，所述过热器级间换热器的壳侧出口与所述热网的热网供水管路连接；The tube side outlet of the heating network heater is connected to the shell side inlet of the superheater interstage heat exchanger, and the shell side outlet of the superheater interstage heat exchanger is connected to the heating network water supply pipeline of the heating network. connect;
所述汽轮机组通过传动轴与所述发动机连接；The steam turbine unit is connected to the engine through a transmission shaft;
所述过热器级间换热器用于利用锅炉中产生的热能对热网水进行补充供热。The superheater interstage heat exchanger is used to supplement the heating network water by utilizing the thermal energy generated in the boiler.
根据本公开的一个实施例，所述***还包括第一调节阀，其中，According to an embodiment of the present disclosure, the system further includes a first regulating valve, wherein,
所述第一调节阀的一端与所述热网加热器的管侧出口连接；One end of the first regulating valve is connected to the pipe side outlet of the heat network heater;
所述第一调节阀的另一端连接在所述热网加热器与所述热网供水管路之间的管路上。The other end of the first regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
根据本公开的一个实施例，所述汽轮机组包括高压缸、中压缸和低压缸，其中，According to an embodiment of the present disclosure, the steam turbine unit includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, wherein,
所述高压缸通过传动轴依次连接所述中压缸、所述低压缸和所述发电机；The high-pressure cylinder is connected to the medium-pressure cylinder, the low-pressure cylinder and the generator in sequence through a transmission shaft;
所述二级过热器的出口依次连接所述高压缸、所述中压缸和所述低压缸；The outlet of the secondary superheater is connected to the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence;
所述中压缸的出口与所述热网加热器的壳侧入口连接。The outlet of the medium-pressure cylinder is connected with the shell-side inlet of the heat network heater.
根据本公开的一个实施例，所述锅炉还包括一级再热器、二级再热器和再热器级间换热器，其中，According to an embodiment of the present disclosure, the boiler further includes a primary reheater, a secondary reheater and a reheater interstage heat exchanger, wherein,
所述高压缸的出口依次连接所述一级再热器、所述再热器级间换热器、所述二级再热器和所述中压缸的入口；The outlet of the high-pressure cylinder is connected in sequence to the first-stage reheater, the reheater interstage heat exchanger, the second-stage reheater and the inlet of the medium-pressure cylinder;
所述热网加热器的管侧出口与所述再热器级间换热器的壳侧入口连接；The tube side outlet of the heat network heater is connected to the shell side inlet of the reheater interstage heat exchanger;
所述再热器级间换热器的壳侧出口与所述热网供水管路连接。The shell-side outlet of the reheater interstage heat exchanger is connected to the water supply pipeline of the heating network.
根据本公开的一个实施例，所述***还包括第二调节阀，其中，According to an embodiment of the present disclosure, the system further includes a second regulating valve, wherein,
所述第二调节阀的一端与所述热网加热器的管侧出口连接；One end of the second regulating valve is connected to the pipe side outlet of the heat network heater;
所述第二调节阀的另一端连接在所述热网加热器与所述热网供水管路之间的管路上。The other end of the second regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
根据本公开的一个实施例，所述***还包括第三调节阀，其中，According to an embodiment of the present disclosure, the system further includes a third regulating valve, wherein,
所述第三调节阀连接在所述热网加热器与所述热网供水管路之间的管路上。The third regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
根据本公开的一个实施例，所述***还包括凝汽器、凝结水泵、低压加热器组、除氧器、给水泵和高压加热器组，其中，According to an embodiment of the present disclosure, the system further includes a condenser, a condensate pump, a low-pressure heater group, a deaerator, a feed water pump and a high-pressure heater group, wherein,
所述低压缸的出口依次连接所述凝汽器、所述凝结水泵、所述低压加热器组、所述除氧器、所述给水泵和所述高压加热器组；The outlet of the low-pressure cylinder is connected in sequence to the condenser, the condensate pump, the low-pressure heater group, the deaerator, the feed water pump and the high-pressure heater group;
所述高压加热器组通过所述锅炉给水管路与所述一级过热器的入口连接；The high-pressure heater group is connected to the inlet of the first-stage superheater through the boiler feed water pipeline;
所述热网加热器的壳侧出口与所述低压加热器组的入口连接。The shell-side outlet of the heat network heater is connected with the inlet of the low-pressure heater group.
根据本公开实施例的第二方面，一种应用于如第一方面所述的用于供热机组的热电解耦***的方法，包括：According to a second aspect of an embodiment of the present disclosure, a method applied to the thermoelectric decoupling system for a heating unit as described in the first aspect, includes:
响应于接收到机组对外供热指令，控制所述第一调节阀和所述第二调节阀关闭，控制所述第三调节阀打开；In response to receiving the external heating instruction of the unit, control the first regulating valve and the second regulating valve to close, and control the third regulating valve to open;
响应于接收到提升对外供热量指令，获取目标热负荷值和当前电负荷值；In response to receiving the instruction to increase the external heat supply, obtain the target heat load value and the current electrical load value;
基于所述目标热负荷值和当前机组电负荷值，确定所述高压缸入口的主蒸汽目标温度值和所述中压缸入口的再热蒸汽目标温度值；Based on the target heat load value and the current unit electrical load value, determine the main steam target temperature value at the high-pressure cylinder inlet and the reheat steam target temperature value at the medium-pressure cylinder inlet;
获取所述高压缸入口的当前主蒸汽温度值和所述中压缸入口的当前再热蒸汽温度值；Obtain the current main steam temperature value of the high-pressure cylinder inlet and the current reheat steam temperature value of the medium-pressure cylinder inlet;
将所述主蒸汽目标温度值与所述当前主蒸汽温度值进行比对，基于比对结果调节所述第一调节阀的开合角度；Compare the main steam target temperature value with the current main steam temperature value, and adjust the opening and closing angle of the first regulating valve based on the comparison result;
将所述再热蒸汽目标温度值与所述当前再热蒸汽温度值进行比对，基于比对结果调节所述第二调节阀的开合角度。The reheat steam target temperature value is compared with the current reheat steam temperature value, and the opening and closing angle of the second regulating valve is adjusted based on the comparison result.
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本申请。It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present application.
附图说明Description of the drawings
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理，并不构成对本公开的不当限定。The drawings herein are incorporated into and constitute a part of this specification, illustrate embodiments consistent with the disclosure, and together with the description are used to explain the principles of the disclosure, and do not constitute undue limitations on the disclosure.
图1为本公开实施例中提出的一种用于供热机组的热电解耦***的结构示意图；Figure 1 is a schematic structural diagram of a thermoelectric decoupling system for a heating unit proposed in an embodiment of the present disclosure;
图2为本公开实施例中提出的一种用于供热机组的热电解耦***的方法的流程图。FIG. 2 is a flow chart of a method for a thermoelectric decoupling system of a heating unit proposed in an embodiment of the present disclosure.
附图标记Reference signs
1、过热器级间换热器；2、再热器级间换热器；3、一级过热器；4、二级过热器；5、一级再热器；6、二级再热器；7、热网加热器；8、第一调节阀；9、第二调节阀；10、第三调节阀；11、高压缸；12、中压缸；13、低压缸；14、发电机；15、凝汽器；16、凝结水泵；17、低压加热器组；18、除氧器；19、给水泵；20、高压加热器组。1. Superheater interstage heat exchanger; 2. Reheater interstage heat exchanger; 3. Primary superheater; 4. Secondary superheater; 5. Primary reheater; 6. Secondary reheater ; 7. Heating network heater; 8. First regulating valve; 9. Second regulating valve; 10. Third regulating valve; 11. High pressure cylinder; 12. Medium pressure cylinder; 13. Low pressure cylinder; 14. Generator; 15. Condenser; 16. Condensation water pump; 17. Low-pressure heater group; 18. Deaerator; 19. Feed water pump; 20. High-pressure heater group.
具体实施方式Detailed ways
为了使本领域普通人员更好地理解本公开的技术方案，下面将结合附图，对本公开实施例中的技术方案进行清楚、完整地描述。In order to allow ordinary people in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings.
需要说明的是，本公开的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本公开的实施例能够以除了在这里图示或描述的那些以外的顺序实施。以下示例性实施例中所描述的实施方式并不代表与本公开相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本公开的一些方面相一致的装置和方法的例子。It should be noted that the terms "first", "second", etc. in the description and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the disclosure described herein can be practiced in sequences other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with aspects of the disclosure as detailed in the appended claims.
图1为本公开实施例中提出的一种用于供热机组的热电解耦***的结构示意图。Figure 1 is a schematic structural diagram of a thermoelectric decoupling system for a heating unit proposed in an embodiment of the present disclosure.
如图1所示，该用于供热机组的热电解耦***包括：锅炉、过热器级间换热器1、汽轮机组和热网加热器7、发电机14，锅炉包括一级过热器3和二级过热器4。As shown in Figure 1, the thermoelectric decoupling system for heating units includes: boiler, superheater interstage heat exchanger 1, steam turbine unit and heating network heater 7, generator 14. The boiler includes a first-stage superheater 3 and secondary superheater 4.
其中，一级过热器3的入口与锅炉给水管路连接，一级过热器3的出口依次连接过热器级间换热器1的管侧、二级过热器4、汽轮机组和热网加热器7的壳侧；热网加热器7的管侧通过循环管路与热网连接；热网加热器7的管侧出口与过热器级间换热器1的壳侧入口连接，过热器级间换热器1的壳侧出口与热网的热网供水管路连接；汽轮机组通过传动轴与发动机连接；过热器级间换热器1用于利用锅炉中产生的热能对热网水进行补充供热。Among them, the inlet of the primary superheater 3 is connected to the boiler feed water pipeline, and the outlet of the primary superheater 3 is connected in turn to the tube side of the superheater interstage heat exchanger 1, the secondary superheater 4, the steam turbine unit and the heating network heater. 7; the tube side of the heating network heater 7 is connected to the heating network through a circulation pipeline; the tube side outlet of the heating network heater 7 is connected to the shell side inlet of the superheater interstage heat exchanger 1, and the superheater interstage The shell side outlet of heat exchanger 1 is connected to the water supply pipeline of the heating network; the steam turbine unit is connected to the engine through the transmission shaft; the superheater interstage heat exchanger 1 is used to supplement the heating network water using the heat energy generated in the boiler Heating.
该***还包括第一调节阀8，其中，第一调节阀8的一端与热网加热器7的管侧出口连接；第一调节阀8的另一端连接在热网加热器7与热网供水管路之间的管路上。The system also includes a first regulating valve 8, where one end of the first regulating valve 8 is connected to the pipe side outlet of the heating network heater 7; the other end of the first regulating valve 8 is connected between the heating network heater 7 and the heating network water supply. on the pipes between pipes.
需要说明的是，上述管侧可以是设备中用于传输高压介质的一侧，壳侧可以是设备中用于传输低压介质的一侧。其中，高压介质可以是蒸汽，也可以是水，低压介质可以是水，也可以是蒸汽。It should be noted that the above-mentioned tube side may be the side of the equipment used for transmitting high-pressure medium, and the shell side may be the side of the equipment used for transmitting low-pressure medium. Among them, the high-pressure medium can be steam or water, and the low-pressure medium can be water or steam.
作为一种可能的示例，水由锅炉给水管路流经给水加热装置后进入到一级过热器3中进行加热，形成高温水蒸汽，水蒸汽进入到过热器级间换热器1中。汽轮机中的蒸汽由汽轮机出口进入到热网加热器7中，与热网水回水进行换热。热网加热器7将加热后的热网回水输送至过热器级间换热器1中与上述水蒸气进行换热，升温后的热网水通过热网供水管路进入 到热网中，降温后的水蒸汽进入到二级过热器4中进行二次加热。二次加热后的蒸汽进入到汽轮机组中做功，从而带动发电机14进行发电。As a possible example, water flows from the boiler feed water pipe through the feed water heating device and then enters the first-stage superheater 3 for heating, forming high-temperature water vapor, and the water vapor enters the superheater interstage heat exchanger 1 . The steam in the steam turbine enters the heating network heater 7 from the steam turbine outlet, and exchanges heat with the return water of the heating network. The heating network heater 7 transports the heated heating network return water to the superheater interstage heat exchanger 1 to exchange heat with the above-mentioned water vapor. The heated heating network water enters the heating network through the heating network water supply pipeline. The cooled water vapor enters the secondary superheater 4 for secondary heating. The reheated steam enters the steam turbine unit to perform work, thus driving the generator 14 to generate electricity.
汽轮机组包括高压缸11、中压缸12和低压缸13，其中，高压缸11通过传动轴依次连接中压缸12、低压缸13和发电机14；二级过热器4的出口依次连接高压缸11、中压缸12和低压缸13；中压缸12的出口与热网加热器7的壳侧入口连接。The steam turbine unit includes a high-pressure cylinder 11, an intermediate-pressure cylinder 12 and a low-pressure cylinder 13. The high-pressure cylinder 11 is connected to the intermediate-pressure cylinder 12, the low-pressure cylinder 13 and the generator 14 in sequence through a transmission shaft; the outlet of the secondary superheater 4 is connected to the high-pressure cylinder in sequence. 11. Medium-pressure cylinder 12 and low-pressure cylinder 13; the outlet of the medium-pressure cylinder 12 is connected to the shell-side inlet of the heat network heater 7.
作为一种可能的示例，蒸汽由二级过热器4依次进入高压缸11、中压缸12和低压缸13中做功，从而带动发电机14发电，中压缸12出口的部分蒸汽进入到热网加热器7中，与热网加热器7中的热网水回水进行换热，从而加热热网水回水。As a possible example, the steam from the secondary superheater 4 sequentially enters the high-pressure cylinder 11 , the intermediate-pressure cylinder 12 and the low-pressure cylinder 13 to perform work, thus driving the generator 14 to generate electricity, and part of the steam at the outlet of the intermediate-pressure cylinder 12 enters the heating network. The heater 7 exchanges heat with the hot network water return water in the heating network heater 7, thereby heating the hot network water return water.
锅炉还包括一级再热器5、二级再热器6和再热器级间换热器2，其中，高压缸11的出口依次连接一级再热器5、再热器级间换热器2、二级再热器6和中压缸12的入口；热网加热器7的管侧出口与再热器级间换热器2的壳侧入口连接；再热器级间换热器2的壳侧出口与热网供水管路连接。The boiler also includes a primary reheater 5, a secondary reheater 6 and a reheater interstage heat exchanger 2. The outlet of the high-pressure cylinder 11 is connected to the primary reheater 5, the reheater interstage heat exchanger in turn. The inlet of the reheater 2, the secondary reheater 6 and the medium pressure cylinder 12; the tube side outlet of the heat network heater 7 is connected to the shell side inlet of the reheater interstage heat exchanger 2; the reheater interstage heat exchanger The shell side outlet of 2 is connected to the heating network water supply pipeline.
该***还包括第二调节阀9，其中，第二调节阀9的一端与热网加热器7的管侧出口连接；第二调节阀9的另一端连接在热网加热器7与热网供水管路之间的管路上。The system also includes a second regulating valve 9, wherein one end of the second regulating valve 9 is connected to the pipe side outlet of the heating network heater 7; the other end of the second regulating valve 9 is connected between the heating network heater 7 and the heating network water supply. on the pipes between pipes.
可以理解的是，作为一种可能的实施方式的示例，蒸汽由二级过热器加热后进入到高压缸11中做功，然后返回至锅炉中进行二次加热。It can be understood that, as an example of a possible implementation, the steam is heated by the secondary superheater and then enters the high-pressure cylinder 11 to perform work, and then returns to the boiler for secondary heating.
作为一种可能的示例，蒸汽由高压缸11进入到一级再热器5中进行加热，然后进入到再热器级间换热器2中，热网加热器7将热网水回水输送至再热器级间换热器2中，热网水回水与上述蒸汽进行换热后通过热网供水管路返回至热网中对外供热。上述蒸汽依次进入二级再热器6和中压缸12中。As a possible example, the steam enters the first-stage reheater 5 from the high-pressure cylinder 11 for heating, and then enters the reheater interstage heat exchanger 2. The heat network heater 7 returns the hot network water to the water. In the reheater interstage heat exchanger 2, the return water from the heating network exchanges heat with the steam and then returns to the heating network through the heating network water supply pipeline for external heating. The above-mentioned steam enters the secondary reheater 6 and the medium-pressure cylinder 12 in sequence.
需要说明的是，在本公开一些实施例中，通过热网水与主蒸汽和再热蒸汽进行换热，从而对热网水进行加热，进而对热网进行补充供热，相比于抽汽供热，能够实现在不减少进入汽轮机的蒸汽量的情况下，通过对蒸汽的温度控制实现电负荷调节，并实现热网的补充供热，有效提高了机组的热电解耦能力。It should be noted that in some embodiments of the present disclosure, the hot network water exchanges heat with the main steam and reheated steam, thereby heating the hot network water, and then supplementing the heat supply to the heating network. Compared with the extraction of steam Heating can realize electrical load regulation through temperature control of steam without reducing the amount of steam entering the steam turbine, and realize supplementary heating of the heating network, which effectively improves the thermoelectric decoupling capability of the unit.
该***还包括第三调节阀10，其中，第三调节阀10连接在热网加热器7与热网供水管路之间的管路上。The system also includes a third regulating valve 10, wherein the third regulating valve 10 is connected on the pipeline between the heating network heater 7 and the heating network water supply pipeline.
作为一种可能的示例，机组正常对外供热时，第一调节阀8和第二调节阀9关闭，第三调节阀10打开，热网水回水进入热网加热器7中，与中压缸12排汽进行换热，被加热后的热网水回水通过热网供水管路返回至热网中。当机组需要提升对外供热量时，将第一调节阀8和第二调节阀9打开，使部分热网水回水进入到过热器级间换热器1、再热器级间换热器2中，与主蒸汽和再热蒸汽进行换热。可以理解的是，由于蒸汽将部分热量传递给热网水，进入汽轮机的入口蒸汽温度降低。As a possible example, when the unit supplies heat to the outside normally, the first regulating valve 8 and the second regulating valve 9 are closed, the third regulating valve 10 is opened, and the hot water network return water enters the heating network heater 7 and is connected with the medium pressure The exhaust steam of cylinder 12 performs heat exchange, and the heated return water of the heating network returns to the heating network through the heating network water supply pipeline. When the unit needs to increase the external heat supply, the first regulating valve 8 and the second regulating valve 9 are opened, so that part of the hot network water return water enters the superheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2, heat exchange with main steam and reheat steam. It can be understood that since the steam transfers part of its heat to the hot network water, the inlet steam temperature entering the turbine decreases.
该***还包括凝汽器15、凝结水泵16、低压加热器组17、除氧器18、给水泵19和高压加热器组20，其中，低压缸的出口依次连接凝汽器15、凝结水泵16、低压加热器组17、除氧器18、给水泵19和高压加热器组20；高压加热器组20通过锅炉给水管路与一级过热器3的入口连接；热网加热器7的壳侧出口与低压加热器组17的入口连接。The system also includes a condenser 15, a condensate pump 16, a low-pressure heater group 17, a deaerator 18, a feed water pump 19 and a high-pressure heater group 20. The outlet of the low-pressure cylinder is connected to the condenser 15 and the condensate pump 16 in sequence. , low-pressure heater group 17, deaerator 18, feed water pump 19 and high-pressure heater group 20; the high-pressure heater group 20 is connected to the inlet of the primary superheater 3 through the boiler feed water pipeline; the shell side of the heat network heater 7 The outlet is connected with the inlet of the low-pressure heater group 17.
作为一种可能的示例，蒸汽依次进入高压缸11、中压缸12、低压缸13中做功，从而带动发电机14发电，做功后的蒸汽依次进入凝汽器15、凝结水泵16、低压加热器组17、除氧器18、给水泵19和高压加热器组20，最终返回至一级过热器3中，完成循环。中压缸12的部分排汽进入到热网加热器7中，与热网水回水进行换热后进入到低压加热器组17中，与低压缸13输出的蒸汽一起返回至锅炉的一级过热器3中。As a possible example, the steam sequentially enters the high-pressure cylinder 11, the medium-pressure cylinder 12, and the low-pressure cylinder 13 to perform work, thus driving the generator 14 to generate electricity. The steam after performing the work sequentially enters the condenser 15, the condensate pump 16, and the low-pressure heater. Group 17, deaerator 18, feed water pump 19 and high pressure heater group 20 finally return to the primary superheater 3 to complete the cycle. Part of the exhaust steam from the medium-pressure cylinder 12 enters the heating network heater 7, exchanges heat with the hot network return water, and then enters the low-pressure heater group 17, and returns to the first stage of the boiler together with the steam output from the low-pressure cylinder 13. Superheater 3.
根据本公开实施例的用于供热机组的热电解耦***，通过利用热网水对主蒸汽、再热蒸汽进行减温，一方面，提升了热网供水温度，增加了机组对外供热量；另一方面，降低了汽轮机入口过热蒸汽、再热蒸汽的温度，从而使机组发电功率降低。该发明在提升机组供热能力的同时，降低机组电出力，提升了机组热电解耦运行的灵活性。另外，通过第一调节阀、第二调节阀，能够有效提高调节主蒸汽、再热蒸汽减温幅度的精准度，从而实现机组电负荷、热负荷的灵活调节。According to the thermoelectric decoupling system for the heating unit according to the embodiment of the present disclosure, by using hot network water to deheat the main steam and reheated steam, on the one hand, the temperature of the heating network water supply is increased and the external heat supply of the unit is increased. On the other hand, the temperature of the superheated steam and reheated steam at the turbine inlet is reduced, thereby reducing the power generation of the unit. This invention not only improves the heating capacity of the unit, but also reduces the electrical output of the unit and improves the flexibility of the unit's thermoelectric decoupling operation. In addition, through the first regulating valve and the second regulating valve, the accuracy of adjusting the temperature reduction range of the main steam and reheated steam can be effectively improved, thereby achieving flexible adjustment of the electrical load and thermal load of the unit.
图2为本公开实施例中提出的一种用于供热机组的热电解耦***的方法的流程图。在本公开一些实施例中，如图2所示，该用于供热机组的热电解耦***的方法包括步骤201至步骤205。FIG. 2 is a flow chart of a method for a thermoelectric decoupling system of a heating unit proposed in an embodiment of the present disclosure. In some embodiments of the present disclosure, as shown in FIG. 2 , the method for a thermoelectric decoupling system of a heating unit includes steps 201 to 205 .
步骤201，响应于接收到提升对外供热量指令，获取目标热负荷值。Step 201: In response to receiving an instruction to increase external heat supply, obtain the target heat load value.
可以理解的是，在需要机组正常对外供热时，可以控制第一调节阀8和第二调节阀9关闭，控制第三调节阀10打开。It can be understood that when the unit needs to supply heat to the outside normally, the first regulating valve 8 and the second regulating valve 9 can be controlled to close, and the third regulating valve 10 can be controlled to open.
步骤202，基于目标热负荷值和当前电负荷值，确定高压缸11入口的主蒸汽目标温度值和中压缸12入口的再热蒸汽目标温度值。Step 202: Based on the target heat load value and the current electrical load value, determine the target temperature value of the main steam at the inlet of the high-pressure cylinder 11 and the target temperature value of the reheat steam at the inlet of the intermediate-pressure cylinder 12.
需要说明的是，当目标热负荷值和当前电负荷值确定后，高压缸11入口的主蒸汽目标温度值、中压缸12入口的再热蒸汽目标温度值以及机组主蒸汽流量之间存在对应关系。It should be noted that when the target heat load value and the current electrical load value are determined, there is a correspondence between the main steam target temperature value at the inlet of the high-pressure cylinder 11, the reheat steam target temperature value at the inlet of the medium-pressure cylinder 12, and the main steam flow rate of the unit. relation.
作为一种可能的示例，可以预先基于计算分析结果或测试记录不同目标热负荷值和电负荷值所对应的高压缸11入口的主蒸汽目标温度值、中压缸12入口的再热蒸汽目标温度值以及机组主蒸汽流量值，需要提升热负荷时，可以根据目标热负荷值及当前电负荷值，确定与该目标热负荷值对应的高压缸11入口的主蒸汽目标温度值、中压缸12入口的再热蒸汽目标温度值以及机组主蒸汽流量值。As a possible example, the main steam target temperature value at the inlet of the high-pressure cylinder 11 and the reheat steam target temperature at the inlet of the medium-pressure cylinder 12 corresponding to different target heat load values and electrical load values can be recorded in advance based on calculation analysis results or tests. value and the main steam flow value of the unit. When the heat load needs to be increased, the main steam target temperature value at the inlet of the high-pressure cylinder 11 and the medium-pressure cylinder 12 corresponding to the target heat load value can be determined based on the target heat load value and the current electrical load value. The target reheat steam temperature value at the inlet and the main steam flow rate value of the unit.
步骤203，获取高压缸11入口的当前主蒸汽温度值、中压缸12入口的当前再热蒸汽温度值。Step 203: Obtain the current main steam temperature value at the inlet of the high-pressure cylinder 11 and the current reheat steam temperature value at the inlet of the medium-pressure cylinder 12.
作为一种可能实施的示例，可以在高压缸11入口以及中压缸12入口安装温度传感器，通过温度传感器检测高压缸11入口的当前主蒸汽温度值和中压缸12入口的当前再热蒸汽温度值。As an example of possible implementation, temperature sensors can be installed at the inlet of the high-pressure cylinder 11 and the inlet of the intermediate-pressure cylinder 12, and the current main steam temperature value at the inlet of the high-pressure cylinder 11 and the current reheat steam temperature at the inlet of the intermediate-pressure cylinder 12 are detected by the temperature sensor. value.
步骤204，将主蒸汽目标温度值与当前主蒸汽温度值进行比对，基于比对结果调节第一调节阀8的开合角度。Step 204: Compare the main steam target temperature value with the current main steam temperature value, and adjust the opening and closing angle of the first regulating valve 8 based on the comparison result.
可以理解的是，将主蒸汽目标温度值与当前主蒸汽温度值进行比对，差值越大，调节第一调节阀8的开合角度越大。It can be understood that the main steam target temperature value is compared with the current main steam temperature value. The larger the difference, the larger the opening and closing angle of the first regulating valve 8 is adjusted.
步骤205，将再热蒸汽目标温度值与当前再热蒸汽温度值进行比对，基于比对结果调节 第二调节阀9的开合角度。Step 205: Compare the reheat steam target temperature value with the current reheat steam temperature value, and adjust the opening and closing angle of the second regulating valve 9 based on the comparison result.
可以理解的是，将再热蒸汽目标温度值与当前再热蒸汽温度值进行比对，差值越大，调节第二调节阀9的开合角度越大。It can be understood that the target temperature value of the reheated steam is compared with the current temperature value of the reheated steam. The larger the difference, the larger the opening and closing angle of the second regulating valve 9 is adjusted.
作为一种可能实施的示例，还可以获取当前机组主蒸汽流量值和主蒸汽目标流量值，将机组主蒸汽目标流量值与当前主蒸汽流量值进行比对，基于比对结果调节锅炉给水流量及汽轮机进汽阀门。As an example of possible implementation, you can also obtain the current unit main steam flow value and the main steam target flow value, compare the unit main steam target flow value with the current main steam flow value, and adjust the boiler feed water flow and flow rate based on the comparison results. Turbine steam inlet valve.
举例来说，机组正常对外供热时，第一调节阀8、第二调节阀9关闭，第三调节阀10全开，热网循环水回水进入热网加热器7中被机组抽汽加热，之后送入热网供水管路。For example, when the unit supplies heat to the outside normally, the first regulating valve 8 and the second regulating valve 9 are closed, the third regulating valve 10 is fully opened, and the return water of the heating network circulating water enters the heating network heater 7 and is heated by the steam extracted by the unit. , and then sent to the heating network water supply pipeline.
此时，机组发电负荷为E，E＝f(P,M)＝f1(P)，P为机组主蒸汽压力，M为机组主蒸汽流量，发电负荷可以由机组主蒸汽压力确定。At this time, the power generation load of the unit is E, E=f(P,M)=f1(P), P is the main steam pressure of the unit, M is the main steam flow of the unit, and the power generation load can be determined by the main steam pressure of the unit.
机组抽汽供热模式下最大对外供热量Q，Q＝f2(E)＝f3(P)。The maximum external heat supply Q in the unit's extraction steam heating mode, Q=f2(E)=f3(P).
当机组需提升对外供热量(或降低发电负荷时)，打开第一调节阀8、第二调节阀9，引热网加热器7出口部分热网循环水进入过热器级间换热器1、再热器级间换热器2，与主蒸汽、再热蒸汽进行换热。由于蒸汽将部分热量传递给热网水，进入汽轮机组的入口蒸汽温度降低，When the unit needs to increase the external heat supply (or reduce the power generation load), open the first regulating valve 8 and the second regulating valve 9, and the heating network circulating water at the outlet of the heating network heater 7 enters the superheater interstage heat exchanger 1 , Reheater interstage heat exchanger 2, exchanges heat with main steam and reheat steam. Since the steam transfers part of its heat to the hot water, the temperature of the inlet steam entering the turbine unit decreases.
此时，机组电负荷E＝f4(P,T1,T2)，其中T1为汽轮机入口主蒸汽温度，T2为汽轮机入口再热蒸汽温度。由于T1、T2降低，机组电负荷E降低。At this time, the electrical load of the unit is E = f4 (P, T1, T2), where T1 is the main steam temperature at the turbine inlet, and T2 is the reheat steam temperature at the turbine inlet. As T1 and T2 decrease, the electrical load E of the unit decreases.
热网加热器7出口热网循环水进入过热器级间换热器1、再热器级间换热器2被蒸汽进一步加热，之后再对外供出，机组最大对外供热量The circulating water from the hot network heater 7 outlet enters the superheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2 and is further heated by the steam, and then is supplied to the outside. The maximum heat supply of the unit is to the outside.
Q’＝Q+Q1＝f2(E)+Q1＝f4(P,T1,T2)+Q1Q’＝Q+Q1＝f2(E)+Q1＝f4(P,T1,T2)+Q1
其中，Q1为热网循环水在过热器级间换热器1、再热器级间换热器2中吸收的热量。Among them, Q1 is the heat absorbed by the heating network circulating water in the superheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2.
Q1＝W 主蒸汽·(h T10-h T1)+W 再热蒸汽·(h T20-h T2)＝C P·W 循环水·(T4-T3)＝f5(P,T1,T2) Q1＝W main steam · (h T10 -h T1 ) + W reheat steam · (h T20 -h T2 ) = C P · W circulating water · (T4-T3) = f5 (P, T1, T2)
其中，W 主蒸汽为主蒸汽流量，W 再热蒸汽为再热蒸汽流量，W 循环水为热网循环水流量，h T10为机组原主蒸汽焓值，h T20为机组原再热蒸汽焓值，h T1为降温后汽轮机入口主蒸汽焓值，h T2为降温后汽轮机入口再热蒸汽焓值，C P为水定压比热容，T4为热网循环水供水温度，T3为热网加热器7出口循环水温度。 Among them, W main steam is the main steam flow, W reheat steam is the reheat steam flow, W circulating water is the heating network circulating water flow, h T10 is the original main steam enthalpy value of the unit, h T20 is the original reheat steam enthalpy value of the unit, h T1 is the main steam enthalpy value at the turbine inlet after cooling, h T2 is the reheated steam enthalpy value at the turbine inlet after cooling, C P is the constant pressure specific heat capacity of water, T4 is the heating network circulating water supply temperature, T3 is the heating network heater 7 outlet Circulating water temperature.
故Q’＝f4(P,T1,T2)+f5(P,T1,T2)＝f6(P,T1,T2)，即供热量Q’也可由P、T1、T2确定。Therefore, Q’ = f4 (P, T1, T2) + f5 (P, T1, T2) = f6 (P, T1, T2), that is, the heat supply Q’ can also be determined by P, T1, and T2.
而降温后主、再热蒸汽温度T1、T2由第一调节阀8、第二调节阀9的开度确定。通过第一调节阀8、第二调节阀9调节流经过热器级间换热器1、再热器级间换热器2的循环水流量，从而对主、再热蒸汽温度T1、T2进行调节。实现对机组电负荷及对外供热量的调节。机组主蒸汽流量可通过调节锅炉给水流量及汽轮机进汽阀门进行调节。The main and reheat steam temperatures T1 and T2 after cooling are determined by the openings of the first regulating valve 8 and the second regulating valve 9 . The first regulating valve 8 and the second regulating valve 9 regulate the circulating water flow flowing through the preheater interstage heat exchanger 1 and the reheater interstage heat exchanger 2, thereby controlling the main and reheat steam temperatures T1 and T2. adjust. Realize the adjustment of the unit's electrical load and external heat supply. The main steam flow of the unit can be adjusted by adjusting the boiler feed water flow and the turbine steam inlet valve.
对主、再热蒸汽温度T1、T2进行调节时，主蒸汽可实现的最大降温值T1max为蒸汽进入高压缸11膨胀做功后，高压缸11排汽过热度为15℃。再热蒸汽可实现的最大降温值T2max为再热蒸汽进入中压缸12膨胀做功后，中压缸12排汽过热度为15℃。When adjusting the main and reheat steam temperatures T1 and T2, the maximum achievable cooling value T1max of the main steam is 15°C after the steam enters the high-pressure cylinder 11 to expand and perform work. The maximum cooling value T2max that can be achieved by the reheated steam is that after the reheated steam enters the intermediate-pressure cylinder 12 to expand and perform work, the superheat degree of the exhaust steam from the intermediate-pressure cylinder 12 is 15°C.
该技术方案由于使得低压缸13入口蒸汽过热度降低，为避免低压缸13通流区域蒸汽湿 度过大造成安全风险，因此该方案适用于低压缸13零出力供热机组、光轴供热机组、背压供热机组等低压缸13进汽流量处于限制状态的供热运行机组。This technical solution reduces the superheat of the steam at the inlet of the low-pressure cylinder 13 and avoids safety risks caused by excessive steam humidity in the flow area of the low-pressure cylinder 13. Therefore, this solution is suitable for low-pressure cylinder 13 zero-output heating units, optical axis heating units, Back-pressure heating units and other heating operation units in which the steam inlet flow of the low-pressure cylinder 13 is in a restricted state.
以亚临界300MW机组为例：Take the subcritical 300MW unit as an example:
机组原设计主汽压力16.7MPa，主蒸汽、再热蒸汽温度538℃，主蒸汽流量1029t/h。机组低压缸13零出力供热模式下，对外供热量为484MW，机组发电负荷为195MW。采用该热电解耦***后，控制高排蒸汽过热度为15℃，主蒸汽换热降温后温度为460℃，再热蒸汽温度460℃，机组发电负荷为166MW，机组对外总供热量为521MW，其中抽汽供热量454MW，主蒸汽换热供热量67MW。采用本方案，使机组电出力调节能力提升29MW，供热量提升37MW。The unit's original design main steam pressure is 16.7MPa, the main steam and reheat steam temperatures are 538°C, and the main steam flow rate is 1029t/h. In the zero-output heating mode of the unit's low-pressure cylinder 13, the external heat supply is 484MW, and the unit's power generation load is 195MW. After adopting this thermoelectric decoupling system, the superheat degree of the high-discharge steam is controlled to 15°C, the temperature of the main steam after heat exchange and cooling is 460°C, the temperature of the reheat steam is 460°C, the power generation load of the unit is 166MW, and the total external heat supply of the unit is 521MW. , including extraction steam heat supply of 454MW and main steam heat exchange heat supply of 67MW. Using this solution, the unit's electric output adjustment capacity is increased by 29MW, and the heat supply is increased by 37MW.
以超临界680MW机组为例：Take the supercritical 680MW unit as an example:
机组原设计主汽压力24.2MPa，主蒸汽、再热蒸汽温度566℃，主蒸汽流量1029t/h。机组低压缸13零出力供热模式下，对外供热量为964MW，机组发电负荷为388MW。采用该热电解耦***后，控制高排蒸汽过热度为15℃，主蒸汽换热降温后温度为505℃，再热蒸汽温度505℃，机组发电负荷为342MW，机组对外总供热量为1027MW，其中抽汽供热量920MW，主蒸汽换热供热量107MW。采用本方案，使机组电出力调节能力提升46MW，供热量提升63MW。The unit's original design main steam pressure is 24.2MPa, the main steam and reheat steam temperatures are 566°C, and the main steam flow rate is 1029t/h. In the zero-output heating mode of the unit's low-pressure cylinder 13, the external heat supply is 964MW, and the unit's power generation load is 388MW. After adopting this thermoelectric decoupling system, the superheat degree of the high-discharge steam is controlled to 15°C, the main steam temperature after heat exchange and cooling is 505°C, the reheat steam temperature is 505°C, the power generation load of the unit is 342MW, and the total external heat supply of the unit is 1027MW. , including extraction steam heat supply of 920MW and main steam heat exchange heat supply of 107MW. Using this solution, the unit's electric output adjustment capacity is increased by 46MW, and the heat supply is increased by 63MW.
根据本公开实施例的用于供热机组的热电解耦***的方法，通过利用热网水对主蒸汽、再热蒸汽进行减温，一方面，提升了热网供水温度，增加了机组对外供热量；另一方面，降低了汽轮机入口过热蒸汽、再热蒸汽的温度，从而使机组发电功率降低。该发明在提升机组供热能力的同时，降低机组电出力，提升了机组热电解耦运行的灵活性。另外，通过第一调节阀第二调节阀，能够有效提高调节主蒸汽、再热蒸汽减温幅度的精准度，从而实现机组电负荷、热负荷的灵活调节。此外，本公开仅通过蒸汽级间换热器实现热网水与锅炉蒸汽的换热，进而实现热电解耦，能耗较低，效率较高，相比于电锅炉供热、储热罐供热和热泵供热等技术，有效降低了运行成本。According to the method for the thermoelectric decoupling system of the heating unit according to the embodiment of the present disclosure, by using hot network water to deheat the main steam and reheated steam, on the one hand, the temperature of the heating network water supply is increased, and the external supply of the unit is increased. heat; on the other hand, it reduces the temperature of the superheated steam and reheated steam at the turbine inlet, thereby reducing the power generation of the unit. This invention not only improves the heating capacity of the unit, but also reduces the electrical output of the unit and improves the flexibility of the unit's thermoelectric decoupling operation. In addition, through the first regulating valve and the second regulating valve, the accuracy of adjusting the temperature reduction range of the main steam and reheated steam can be effectively improved, thereby achieving flexible adjustment of the electrical load and thermal load of the unit. In addition, the present disclosure only realizes heat exchange between hot network water and boiler steam through the steam interstage heat exchanger, thereby achieving thermoelectric decoupling, with lower energy consumption and higher efficiency. Compared with electric boiler heating and heat storage tank heating, Technologies such as heat and heat pump heating effectively reduce operating costs.
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the referred devices or components. Must have a specific orientation, be constructed and operate in a specific orientation and are therefore not to be construed as limitations of the invention.
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接或彼此可通讯；可以是直接相连，也可以通过中间媒介间接相连，可 以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanically connected, electrically connected or communicable with each other; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.
在本发明中，术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。As used herein, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (8)

  1. 一种用于供热机组的热电解耦***，包括锅炉、过热器级间换热器、汽轮机组和热网加热器、发电机，所述锅炉包括一级过热器和第二过热器，A thermoelectric decoupling system for a heating unit, including a boiler, a superheater interstage heat exchanger, a steam turbine unit, a heating network heater, and a generator. The boiler includes a primary superheater and a second superheater,
    所述一级过热器的入口与锅炉给水管路连接，所述一级过热器的出口依次连接所述过热器级间换热器的管侧、所述二级过热器、所述汽轮机组和所述热网加热器的壳侧；The inlet of the first-level superheater is connected to the boiler feed water pipeline, and the outlet of the first-level superheater is connected in sequence to the tube side of the interstage heat exchanger of the superheater, the second-level superheater, the steam turbine unit and The shell side of the heating network heater;
    所述热网加热器的管侧通过循环管路与热网连接；The tube side of the heating network heater is connected to the heating network through a circulation pipeline;
    所述热网加热器的管侧出口与所述过热器级间换热器的壳侧入口连接，所述过热器级间换热器的壳侧出口与所述热网的热网供水管路连接；The tube side outlet of the heating network heater is connected to the shell side inlet of the superheater interstage heat exchanger, and the shell side outlet of the superheater interstage heat exchanger is connected to the heating network water supply pipeline of the heating network. connect;
    所述汽轮机组通过传动轴与所述发动机连接；The steam turbine unit is connected to the engine through a transmission shaft;
    所述过热器级间换热器用于利用锅炉中产生的热能对热网水进行补充供热。The superheater interstage heat exchanger is used to supplement the heating network water by utilizing the thermal energy generated in the boiler.
  2. 根据权利要求1所述的***，其中，还包括第一调节阀，The system of claim 1, further comprising a first regulating valve,
    所述第一调节阀的一端与所述热网加热器的管侧出口连接；One end of the first regulating valve is connected to the pipe side outlet of the heat network heater;
    所述第一调节阀的另一端连接在所述热网加热器与所述热网供水管路之间的管路上。The other end of the first regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
  3. 根据权利要求1所述的***，其中，所述汽轮机组包括高压缸、中压缸和低压缸，The system of claim 1, wherein the steam turbine unit includes a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder,
    所述高压缸通过传动轴依次连接所述中压缸、所述低压缸和所述发电机；The high-pressure cylinder is connected to the medium-pressure cylinder, the low-pressure cylinder and the generator in sequence through a transmission shaft;
    所述二级过热器的出口依次连接所述高压缸、所述中压缸和所述低压缸；The outlet of the secondary superheater is connected to the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence;
    所述中压缸的出口与所述热网加热器的管侧入口连接。The outlet of the medium pressure cylinder is connected with the tube side inlet of the heat network heater.
  4. 根据权利要求3所述的***，其中，所述锅炉还包括一级再热器、二级再热器和再热器级间换热器，The system of claim 3, wherein the boiler further includes a primary reheater, a secondary reheater, and a reheater interstage heat exchanger,
    所述高压缸的出口依次连接所述一级再热器、所述再热器级间换热器、所述二级再热器和所述中压缸的入口；The outlet of the high-pressure cylinder is connected in sequence to the first-stage reheater, the reheater interstage heat exchanger, the second-stage reheater and the inlet of the medium-pressure cylinder;
    所述热网加热器的管侧出口与所述再热器级间换热器的壳侧入口连接；The tube side outlet of the heat network heater is connected to the shell side inlet of the reheater interstage heat exchanger;
    所述再热器级间换热器的壳侧出口与所述热网供水管路连接。The shell-side outlet of the reheater interstage heat exchanger is connected to the water supply pipeline of the heating network.
  5. 根据权利要求4所述的***，其中，还包括第二调节阀，The system of claim 4, further comprising a second regulating valve,
    所述第二调节阀的一端与所述热网加热器的管侧出口连接；One end of the second regulating valve is connected to the pipe side outlet of the heat network heater;
    所述第二调节阀的另一端连接在所述热网加热器与所述热网供水管路之间的管路上。The other end of the second regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
  6. 根据权利要求5所述的***，其中，还包括第三调节阀，The system of claim 5, further comprising a third regulating valve,
    所述第三调节阀连接在所述热网加热器与所述热网供水管路之间的管路上。The third regulating valve is connected to the pipeline between the heating network heater and the heating network water supply pipeline.
  7. 根据权利要求3所述的***，其中，还包括凝汽器、凝结水泵、低压加热器组、除氧器、给水泵和高压加热器组，The system according to claim 3, further comprising a condenser, a condensate pump, a low-pressure heater group, a deaerator, a feed water pump and a high-pressure heater group,
    所述低压缸的出口依次连接所述凝汽器、所述凝结水泵、所述低压加热器组、所述除氧器、所述给水泵和所述高压加热器组；The outlet of the low-pressure cylinder is connected in sequence to the condenser, the condensate pump, the low-pressure heater group, the deaerator, the feed water pump and the high-pressure heater group;
    所述高压加热器组通过所述锅炉给水管路与所述一级过热器的入口连接；The high-pressure heater group is connected to the inlet of the first-stage superheater through the boiler feed water pipeline;
    所述热网加热器的壳侧出口与所述低压加热器组的入口连接。The shell-side outlet of the heat network heater is connected with the inlet of the low-pressure heater group.
  8. 一种应用于如权利要求1-7所述的用于供热机组的热电解耦***的方法，包括：A method applied to the thermoelectric decoupling system for a heating unit as claimed in claims 1-7, comprising:
    响应于接收到机组对外供热指令，控制所述第一调节阀和所述第二调节阀关闭，控制所述第三调节阀打开；In response to receiving the external heating instruction of the unit, control the first regulating valve and the second regulating valve to close, and control the third regulating valve to open;
    响应于接收到提升对外供热量指令，获取目标热负荷值和当前电负荷值；In response to receiving the instruction to increase the external heat supply, obtain the target heat load value and the current electrical load value;
    基于所述目标热负荷值和当前电负荷值，确定所述高压缸入口的主蒸汽目标温度值和所述中压缸入口的再热蒸汽目标温度值；Based on the target thermal load value and the current electrical load value, determine the main steam target temperature value at the high-pressure cylinder inlet and the reheat steam target temperature value at the medium-pressure cylinder inlet;
    获取所述高压缸入口的当前主蒸汽温度值和所述中压缸入口的当前再热蒸汽温度值；Obtain the current main steam temperature value of the high-pressure cylinder inlet and the current reheat steam temperature value of the medium-pressure cylinder inlet;
    将所述主蒸汽目标温度值与所述当前主蒸汽温度值进行比对，基于比对结果调节所述第一调节阀的开合角度；Compare the main steam target temperature value with the current main steam temperature value, and adjust the opening and closing angle of the first regulating valve based on the comparison result;
    将所述再热蒸汽目标温度值与所述当前再热蒸汽温度值进行比对，基于比对结果调节所述第二调节阀的开合角度。The reheat steam target temperature value is compared with the current reheat steam temperature value, and the opening and closing angle of the second regulating valve is adjusted based on the comparison result.
PCT/CN2022/140498 2022-04-07 2022-12-20 Thermoelectric decoupling system used for heat supply unit, and method WO2023193477A1 (en)

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