CN115307208A - Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system - Google Patents

Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system Download PDF

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Publication number
CN115307208A
CN115307208A CN202210929018.4A CN202210929018A CN115307208A CN 115307208 A CN115307208 A CN 115307208A CN 202210929018 A CN202210929018 A CN 202210929018A CN 115307208 A CN115307208 A CN 115307208A
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China
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pressure
station
temperature
zero
water
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CN202210929018.4A
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Inventor
刘圣冠
乔磊
马汀山
黄嘉驷
程东涛
贺凯
尚海军
王钰泽
曹勇
万小艳
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Priority to CN202210929018.4A priority Critical patent/CN115307208A/en
Publication of CN115307208A publication Critical patent/CN115307208A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2101/00—Electric generators of small-scale CHP systems
    • F24D2101/10—Gas turbines; Steam engines or steam turbines; Water turbines, e.g. located in water pipes
    • 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]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention discloses a zero-temperature-drop heat supply system of a pressure isolation station based on a high back pressure unit and a working method of the zero-temperature-drop heat supply system, and belongs to the technical field of cogeneration. The system comprises a high-back-pressure condenser, a first-station zero-time net circulating pump, a first-station steam heater, a pressure reduction turbine unit, a heating power station, a pressure-isolating station primary net circulating pump, a return water booster pump and a pressure-isolating station plate heat exchanger. The pressure isolation station and the booster pump (station) are mutually standby, can be switched according to the side load of the heat supply network and the return water temperature of the primary network of the heat station, and have flexible operation mode; when the heat load at the side of the heat supply network or the return water temperature of the primary network heat supply network is higher, the temperature of the inlet water entering the high-back-pressure condenser can be effectively reduced, the safe operation of a unit is guaranteed, meanwhile, the heat exchange ratio of the condenser is improved, the overall heat supply economical efficiency is optimal, and the overall operation cost is obviously reduced.

Description

Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a zero-temperature-drop heat supply system of a pressure isolation station based on a high back pressure unit and a working method thereof.
Background
The high back pressure unit is adopted for supplying heat, heat released by steam condensation in the condenser is absorbed by circulating water of a heat supply network, cold source loss is greatly reduced, and the economy of the unit is greatly improved. However, the problem of low water supply temperature exists in high back pressure heat supply, the upper water supply limit is about 80 ℃, the water supply requirement of a heat supply network in a severe cold period in northern areas is not met, and therefore a steam secondary heating system is usually configured. The method comprises the following steps of firstly heating the circulating water of the heat supply network through a condenser for the first time to absorb the exhaust waste heat of a low-pressure cylinder, and then completing the second heating through a steam heater of a heat supply first station to generate high-temperature hot water.
The temperature of circulating water entering a condenser is strictly controlled and cannot exceed a certain limit value, and the high water temperature affects the safe operation of a unit on one hand and reduces the first heat exchange ratio on the other hand, so that the overall heat supply economy is reduced. In addition, the pressure isolation station arranged on the heat supply network side increases the power consumption and the heat loss of a primary network circulating pump, and indirectly improves the water temperature of heat supply network circulating water entering the high-backpressure condenser due to the addition of primary heat exchange.
Disclosure of Invention
In order to solve the existing problems, the invention aims to provide a pressure-isolated station zero-temperature-drop heating system based on a high-back-pressure unit and a working method thereof, the operation mode is flexible, the temperature of inlet water entering a high-back-pressure condenser can be effectively reduced, the safe operation of the unit is guaranteed, the heat exchange ratio of the condenser is improved, the overall heating economical efficiency is optimal, and the overall operation cost is obviously reduced.
The invention is realized by the following technical scheme:
the invention discloses a pressure-isolating station zero-temperature-drop heat supply system based on a high-back-pressure unit, which comprises a high-back-pressure condenser, a first-station zero-time net circulating pump, a first-station steam heater, a pressure-reducing turbine unit, a heating station, a pressure-isolating station one-time net circulating pump, a return water booster pump and a pressure-isolating station plate heat exchanger, wherein the high-back-pressure condenser is connected with the first-station zero-time net circulating pump;
the high-temperature side outlet of the pressure-isolating station plate-type heat exchanger is connected with the water side inlet of a high-backpressure condenser, and the water side outlet of the high-backpressure condenser is connected with the inlet of a first-station zero-time net circulating pump; the outlet of the primary zero-time net circulating pump is connected with the water side inlet of the primary steam heater; the water side outlet of the steam heater of the first station is respectively connected with the high-temperature side inlets of the pressure reduction turbine unit and the pressure isolation station plate type heat exchanger; the outlet of the pressure reduction turbine unit is connected with the inlet of the high-temperature side of the thermal station; the low-temperature side outlet of the plate heat exchanger of the pressure isolation station is connected with the high-temperature side inlet of the heating station; the high-temperature side outlet of the heating station is respectively connected with the inlet of the pressure-isolated station primary network circulating pump and the inlet of the return water booster pump; the outlet of the pressure-isolating station primary net circulating pump is connected with the low-temperature side inlet of the pressure-isolating station plate heat exchanger; and the outlet of the return water booster pump is connected with the water side inlet of the high back pressure condenser.
Preferably, the inlet of the first zero-time net circulating pump is connected with a water supplementing constant-pressure buffer water tank.
Preferably, a #3 gate valve is arranged between a high-temperature side outlet of the pressure-isolating station plate-type heat exchanger and a water side inlet of the high-back-pressure condenser, a #1 gate valve is arranged between a water side outlet of the first-station steam heater and the pressure-reducing turbine unit, a #2 gate valve is arranged between a water side outlet of the first-station steam heater and a high-temperature side inlet of the pressure-isolating station plate-type heat exchanger, a #5 gate valve is arranged between an outlet of the pressure-reducing turbine unit and a high-temperature side inlet of the heating station, a #6 gate valve is arranged between a low-temperature side outlet of the pressure-isolating station plate-type heat exchanger and a high-temperature side inlet of the heating station, a #7 gate valve is arranged between a high-temperature side outlet of the heating station and an inlet of the pressure-isolating station primary net circulating pump, a #8 gate valve is arranged between a high-temperature side outlet of the heating station and an inlet of the back-water pressure booster pump, and a #4 gate valve is arranged between an outlet of the back-water booster pump and a water side inlet of the high-back-pressure condenser.
Preferably, a #1 regulating valve is connected between a water side inlet and a water side outlet of the high back pressure condenser, a #2 regulating valve is connected between a water side inlet and a water side outlet of the steam heater at the initial station, a #3 regulating valve is connected between a high temperature side inlet and a high temperature side outlet of the pressure isolation station plate type heat exchanger, and a #4 regulating valve is connected between a low temperature side inlet and a low temperature side outlet of the pressure isolation station plate type heat exchanger.
Preferably, a dirt separator is arranged between the outlet of the high-temperature side of the heat station and the inlet of the return water booster pump.
Preferably, two bypasses are arranged between the inlet and the outlet of the return water booster pump, one bypass is provided with a water hammer prevention check valve, and the other bypass is provided with a static pressure control pump.
The working method of the zero-temperature-drop heat supply system of the pressure isolation station based on the high back pressure unit comprises the following steps
And (3) under a common working condition:
when the heat load or the return water temperature of the primary network heat supply network is lower than a preset value, the pressure reduction turbine set and the return water booster pump are not put into operation, and the system is divided into a zero secondary network and a primary network by the pressure isolation station plate type heat exchanger; on the zero-time network side, circulating water of a heat supply network firstly enters a high-backpressure condenser for heating and then enters a first-station steam heater for further heating and temperature rise, and circulating power is provided by a first-station zero-time circulating pump; on the primary net side, the low-temperature side water outlet of the plate heat exchanger of the pressure-isolating station is conveyed to a heating station through a water supply pipeline, after heat is released, the water returns to the low-temperature side inlet of the plate heat exchanger of the pressure-isolating station from a water return pipeline, the next heat exchange cycle is carried out, and the cycle power is provided by a primary net circulating pump of the pressure-isolating station; the temperature of the circulating water entering the heat supply network of the high back pressure condenser is higher than the temperature of the return water of the heating station;
zero temperature drop working condition of the pressure isolation station:
when the heat load or the return water temperature of the primary network heat supply network is higher than a preset value, the plate heat exchanger of the pressure isolation station is not put into operation; the zero secondary network is directly communicated with the primary network, backwater of the heating station enters a high-back-pressure condenser for heating through a backwater booster pump, then enters a first-station steam heater for further heating and temperature rise, and then enters the heating station for heat exchange after being decompressed through a decompression turbine unit; and the temperature of the circulating water entering the heat supply network of the high back pressure condenser is equal to the temperature of the return water of the heating station.
Preferably, under the common working condition, the first station zero-time circulating pump and the pressure-isolating station primary net circulating pump both adopt an inlet constant-pressure operation mode; under the zero temperature drop working condition of the pressure isolation station, the first-station zero-time circulating pump and the return water booster pump are connected in series for operation, the first-station zero-time circulating pump adopts an outlet constant-pressure operation mode, and the return water booster pump adopts a flow feedback control operation mode.
Preferably, under the zero temperature drop working condition of the pressure isolation station, the pressure reduction turbine set reduces the zero-time network water supply pressure to the primary network water supply pressure, and the return water booster pump increases the primary network return water pressure to the zero-time network return water pressure.
Preferably, under the zero temperature drop working condition of the pressure isolation station, potential energy generated by pressure reduction of the pressure reduction turbine set drives the water return booster pump, and the part with insufficient power is supplied by the motor.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a pressure-isolating station zero-temperature-drop heating system based on a high-backpressure unit, wherein a pressure-isolating station and a booster pump (station) are mutually standby, switching can be performed according to the side load of a heat supply network and the return water temperature of a primary network of a heating station, and the operation mode is flexible; when the heat load at the side of the heat supply network or the return water temperature of the primary network heat supply network is higher, the temperature of the inlet water entering the high-back-pressure condenser can be effectively reduced, the safe operation of a unit is guaranteed, meanwhile, the heat exchange ratio of the condenser is improved, the overall heat supply economical efficiency is optimal, and the overall operation cost is obviously reduced.
Furthermore, the inlet of the first zero-time net circulating pump is connected with a water supplementing constant-pressure buffer water tank, so that water supplementing and constant pressure can be performed on the system, and a water hammer generated by the return water booster pump can be absorbed.
Furthermore, regulating valves connected at each side regulate the circulating water flow participating in the heat exchange of the stage.
Furthermore, a dirt remover is arranged between the outlet of the high-temperature side of the heating station and the inlet of the return water booster pump, so that the water quality can be improved, the service life of equipment in the system is prolonged, the maintenance is reduced, and the safety and the stability of the operation of the system are ensured.
Furthermore, a water hammer check valve is connected beside the return water booster pump and can absorb a water hammer generated by the first-station zero-time net circulating pump; the static pressure control pump is connected beside the return water booster pump, and when the pressure of an inlet pipe network of the return water booster pump exceeds a limit value, the zero-time network can be leaked to a water pump return zero-time network pipeline of the primary network.
The working method of the pressure-insulated station zero-temperature-drop heating system based on the high-back-pressure unit, disclosed by the invention, has the advantages of flexible operation mode and high automation degree, can effectively reduce the temperature of inlet water entering the high-back-pressure condenser, ensures the safe operation of the unit, and simultaneously improves the heat exchange ratio of the condenser, so that the overall heat supply economical efficiency is optimal, and the overall operation cost is obviously reduced.
Furthermore, under the zero temperature drop working condition of the pressure isolation station, heat loss caused by heat exchange of a plate type heat exchanger of the pressure isolation station and power consumption of a primary network circulating pump of the pressure isolation station are avoided, power of the return water booster pump is mainly provided by potential energy generated by the pressure reduction turbine unit, increased power consumption is limited, and the whole operation cost is obviously reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system of the present invention;
FIG. 2 is a system equivalent structure diagram of the system of the present invention under a common working condition;
FIG. 3 is a system equivalent structure diagram of the system of the present invention under a zero temperature drop condition.
In the figure: 1-high back pressure condenser; 2- #1 regulator valve; 3-water supplementing constant pressure buffer water tank; 4-first station zero-time net circulating pump; 5-first steam heater; 6- #2 regulating valve; 7- #1 gate valve; 8- #2 gate valve; 9- #3 regulating valve; 10- #3 gate valve; 11- #4 gate valve; 12-a pressure reducing turbine set; gate valves 13- # 5; 14- #6 gate valve; 15- #4 regulator valve; 16-a heat station; 17- #7 gate valve; 18-pressure isolation station primary net circulating pump; 19- #8 gate valve; 20-a dirt separator; 21-water hammer resistant check valve; 22-a return water booster pump; 23-a hydrostatic control pump; 24-pressure isolating station plate type heat exchanger.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
referring to fig. 1, the pressure-isolated station zero-temperature-drop heating system based on the high back pressure unit comprises a high back pressure condenser 1, a water supplementing constant-pressure buffer water tank 3, a first station zero-time network circulating pump 4, a first station steam heater 5, a pressure reducing turbine unit 12, a heating power station 16 and a pressure-isolated station plate heat exchanger 24.
A high-temperature side outlet of the pressure isolation station plate type heat exchanger 24 is connected with a water side inlet of a high-backpressure condenser 1 through a #3 gate valve 10, the water side outlet of the high-backpressure condenser 1 is connected with an inlet of a first station zero-order network circulating pump 4, and a #1 regulating valve 2 is connected between the water side inlet and the water side outlet of the high-backpressure condenser 1 in a bypassing manner; the water supplementing constant-pressure buffer water tank 3 is connected with an inlet of a primary zero-time net circulating pump 4, and an outlet of the primary zero-time net circulating pump 4 is connected with a water side inlet of a primary steam heater 5; the water side outlet of the first-station steam heater 5 is respectively connected with a decompression turbine unit 12 through a #1 gate valve 7 and connected with the high-temperature side inlet of a pressure-isolating station plate type heat exchanger 24 through a #2 gate valve 8; a #2 regulating valve 6 is connected between a water side inlet and a water side outlet of the first-station steam heater 5; a #3 regulating valve 9 is connected between the high-temperature side inlet and the high-temperature side outlet of the pressure-isolating station plate heat exchanger 24; the outlet of the pressure reduction turbine unit 12 is connected with the high-temperature side inlet of the thermal power station 16 through a #5 gate valve 13; the low-temperature side outlet of the pressure-isolating station plate-type heat exchanger 24 is connected with the high-temperature side inlet of the thermal power station 16 through a #6 gate valve 14; the outlet of the high-temperature side of the thermal power station 16 is respectively connected with the inlet of a primary net circulating pump 18 of the pressure-isolated station through a #7 gate valve 17 and is connected with the inlet of a dirt separator 20 through a #8 gate valve 19; the outlet of the pressure-isolating station primary net circulating pump 18 is connected with the low-temperature side inlet of the pressure-isolating station plate heat exchanger 24; a #4 regulating valve 15 is connected between a low-temperature side inlet and a low-temperature side outlet of the pressure-isolating station plate type heat exchanger 24; the outlet of the dirt separator 20 is respectively connected with the inlets of a return water booster pump 22 and a static pressure control pump 23, and the outlets of the return water booster pump 22 and the static pressure control pump 23 are connected with the water side inlet of the high back pressure condenser 1 through a #4 gate valve 11; a water hammer prevention check valve 21 is connected between the inlet and the outlet of the return water boosting pump 22.
The high-temperature side of the plate type heat exchanger 24 of the pressure isolation station is provided with a bypass pipe and a #3 regulating valve 9 between outlets, the low-temperature side of the plate type heat exchanger 24 of the pressure isolation station is provided with a bypass pipe and a #4 regulating valve 15 between outlets, the water side of the steam heater 5 of the initial station is provided with a bypass pipe and a #2 regulating valve 6 between outlets, the water side of the high-backpressure condenser 1 is provided with a bypass pipe and a #1 regulating valve 2 between outlets, and the high-temperature side of the high-backpressure condenser is used for regulating the circulating water flow participating in the heat exchange of the stage.
The working method of the pressure-isolating station zero-temperature-drop heating system based on the high back pressure unit comprises the following steps:
and (3) under a common working condition:
when the heat load or the return water temperature of the primary network heat supply network is lower, the pressure-isolating station plate heat exchanger 24 is put into operation, and the pressure reduction turbine unit 12, the return water booster pump 22 and the static pressure control pump 23 are not put into operation; the method specifically comprises the following steps: the gate valves 7, #4 11, #5 13 and #8 are closed, the gate valves 8, #3 10, #6 14 and #7 are opened, and the plate heat exchanger 24 separates the system into a zero-order net and a primary net, and the equivalent diagram of the system in this condition is shown in fig. 2.
On the zero-time network side, the outlet of the high-temperature side of the plate heat exchanger 24 of the heat-supply network circulating water pressure-isolating station enters a high-back-pressure condenser 1 through a #3 gate valve 10 for heating, then enters a first-station steam heater 5 for further heating and warming, enters the plate heat exchanger 24 of the pressure-isolating station through a #2 gate valve 8, and performs the next heat exchange cycle after releasing heat; the circulating power of the zero-time net side is provided by a first-station zero-time circulating pump 4, the first-station zero-time circulating pump 4 adopts a constant-pressure operation mode, and a constant-pressure point is an inlet of the first-station zero-time circulating pump 4.
On the primary network side, the low-temperature side water outlet of the plate heat exchanger 24 of the pressure-isolating station goes to the thermal power station 16 through a #6 gate valve 14 along a water supply pipeline, and returns to the low-temperature side inlet of the plate heat exchanger 24 of the pressure-isolating station through a #7 gate valve 17 along a water return pipeline after heat is released, so that the next heat exchange cycle is carried out; the circulating power of the primary net side is provided by a primary net circulating pump 18 of the pressure isolation station, the primary net circulating pump 18 of the pressure isolation station adopts a constant pressure operation mode, and a constant pressure point is an inlet of the primary net circulating pump 18 of the pressure isolation station.
Bypass pipes are arranged at the high-temperature side and the outlet of the plate heat exchanger 24 of the pressure-isolating station and are provided with a #3 regulating valve 9 for regulating the circulating water flow participating in heat exchange at the high-temperature side of the plate heat exchanger 24 of the pressure-isolating station; bypass pipes are arranged at the low-temperature side and the outlet of the plate type heat exchanger 24 of the pressure-isolating station and are provided with a #4 regulating valve 15 for regulating the circulating water flow participating in heat exchange at the low-temperature side of the plate type heat exchanger 24 of the pressure-isolating station; a bypass pipe is arranged at the water side and the water outlet of the first-station steam heater 5 and is provided with a #2 regulating valve 6 for regulating the flow of circulating water entering the first-station steam heater 5 to participate in heat exchange; the bypass pipe is arranged at the water inlet and the water outlet of the high back pressure condenser 1 and is provided with a #1 regulating valve 2 for regulating the circulating water flow entering the high back pressure condenser 1 to participate in heat exchange.
Under the working condition, the plate heat exchanger 24 of the pressure isolation station divides the system into a zero-order network and a primary network, and enters the circulating water temperature T of the heat supply network of the high-back-pressure steam condenser 1 B Is higher than the temperature T of the 16 return water of the heating power station C 。
Zero temperature drop working condition of the pressure isolation station:
when the heat load or the return water temperature of the primary network heat supply network is higher, the plate heat exchanger 24 of the pressure isolation station stops running, and the pressure reduction turbine unit 12, the return water booster pump 22 and the static pressure control pump 23 are put into operation, specifically: the #2 gate valve 8, the #3 gate valve 10, the #6 gate valve 14 and the #7 gate valve 17 are closed, the #1 gate valve 7, the #4 gate valve 11, the #5 gate valve 13 and the #8 gate valve 19 are opened, and the equivalent diagram of the system in the operating condition is shown in fig. 3.
Under the working condition, an original zero secondary network is communicated with a primary network, return water of an original heat station 16 firstly enters a dirt separator 20 for dirt removal and water quality improvement, then enters a high-back-pressure condenser 1 for heating through a return water booster pump 22 and a #4 gate valve 11, then enters a first-station steam heater 5 for further heating and temperature rise, and then is reduced in pressure through a pressure reduction turbine unit 12 and enters the heat station 16 for heat exchange.
Under the working condition, the pressure of the original zero-order net and the pressure of the original primary net need to be balanced, in the diagram 3, a point A is a primary net water supply pressure measuring point, a point B is a primary net water return pressure measuring point, a point C is a zero-order net water return pressure measuring point, and a point D is a zero-order net water supply pressure measuring point. The pressure reduction turbine unit 12 is responsible for the original water supply pipe pressure P at the point D in the drawing D Reducing the original water supply pipe pressure P to A point A The return water booster pump 22 is responsible for the pressure P of the original return water pipe at the point B in the drawing B Increasing the original return pipe pressure P to the point C C (ii) a Potential energy Δ P generated by decompression of decompression turbine group 12 DA The energy-saving device can be fully utilized, the energy-saving device is used as a main power source of the return water booster pump 22 to drive the return water booster pump 22 to operate, and the part with insufficient power is supplied by the motor.
Under the working condition, the return water booster pump 22 and the first-station zero-time network circulating pump 4 are operated in series, the return water booster pump 22 adopts a flow feedback control operation mode, and the first-station zero-time network circulating pump 4 adopts an outlet constant-pressure operation mode. A water supplementing constant-pressure buffer water tank 3 is arranged at the inlet of the primary zero-order net circulating pump 4 for supplementing water and maintaining constant pressure, and can absorb a water hammer generated by the return water booster pump 22; a bypass is arranged at the inlet and the outlet of the return water booster pump 22, a waterproof hammer check valve 21 is arranged on the bypass, and a water hammer generated by the first-station zero-time net circulating pump 4 can be absorbed by the water supplementing constant-pressure buffer water tank 3 after passing through the zero-temperature-difference bypass waterproof hammer check valve 21.
In addition, in order to prevent safety accidents caused by the fact that the static pressure of the original primary network exceeds the designed pressure, bypass pipes are arranged at the inlet and the outlet of the return water booster pump 22, the static pressure control pump 23 is configured, when the pressure of the inlet pipe network of the return water booster pump 22 exceeds the limit value, the static pressure control pump 23 is started, and the water volume pump leaking to the primary network from the zero-time network returns to the zero-time network pipeline.
Under the working condition, the original zero-time network is directly communicated with the primary network, the return water of the original primary network directly enters the high-back-pressure condenser 1 after decontamination and pressure rise, and the circulating water temperature T of the heat supply network C Equal to the return water temperature T of the heating power station B Namely, the return water temperature of the primary network is equal to the return water temperature of the zero-time network.
Generally, when the heat load is lower (less than 70% of the designed heat load) or the return water temperature of a primary network heat supply network is lower (the temperature rise in a high back pressure condenser is less than 8 ℃), the system operates under the common working condition; when the heat load is higher (greater than 70% of the designed heat load) or the return water temperature of the primary network heat supply network is higher (the temperature rise in the high back pressure condenser is greater than 8 ℃), the system operates under the zero temperature drop working condition of the pressure isolation station.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention disclosed herein, or the equivalent structures or equivalent flow conversion processes using the contents of the present specification and the drawings, or the direct and indirect applications in other related fields, shall be covered by the scope of the present invention.

Claims (10)

1. A pressure-isolating station zero-temperature-drop heat supply system based on a high back pressure unit is characterized by comprising a high back pressure condenser (1), a first-station zero-time network circulating pump (4), a first-station steam heater (5), a pressure reduction turbine unit (12), a heating power station (16), a pressure-isolating station primary-time network circulating pump (18), a return water booster pump (22) and a pressure-isolating station plate heat exchanger (24);
a high-temperature side outlet of the pressure-isolating station plate-type heat exchanger (24) is connected with a water side inlet of the high-backpressure condenser (1), and a water side outlet of the high-backpressure condenser (1) is connected with an inlet of a first station zero-time net circulating pump (4); the outlet of the first-station zero-time net circulating pump (4) is connected with the water side inlet of the first-station steam heater (5); the water side outlet of the first-station steam heater (5) is respectively connected with the high-temperature side inlets of the pressure reduction turbine unit (12) and the pressure isolation station plate heat exchanger (24); the outlet of the pressure reduction turbine unit (12) is connected with the inlet of the high-temperature side of the heat station (16); the low-temperature side outlet of the plate heat exchanger (24) of the pressure isolation station is connected with the high-temperature side inlet of the heat station (16); the high-temperature side outlet of the heat station (16) is respectively connected with the inlet of a pressure-isolated station primary network circulating pump (18) and the inlet of a water return booster pump (22); an outlet of a pressure-isolating station primary net circulating pump (18) is connected with a low-temperature side inlet of a pressure-isolating station plate heat exchanger (24); the outlet of the return water booster pump (22) is connected with the water side inlet of the high back pressure condenser (1).
2. The pressure-isolated station zero-temperature-drop heating system based on the high-back-pressure unit as claimed in claim 1, wherein an inlet of the first station zero-time net circulating pump (4) is connected with a water-supplementing constant-pressure buffer water tank (3).
3. The pressure-isolated station zero-temperature-drop heating system based on the high-back-pressure unit as claimed in claim 1, wherein a #3 gate valve (10) is arranged between a high-temperature side outlet of a pressure-isolated station plate heat exchanger (24) and a water side inlet of the high-back-pressure condenser (1), a #1 gate valve (7) is arranged between a water side outlet of a head station steam heater (5) and a pressure-reducing turbine unit (12), a #2 gate valve (8) is arranged between a water side outlet of the head station steam heater (5) and a high-temperature side inlet of the pressure-isolated station plate heat exchanger (24), a #5 gate valve (13) is arranged between an outlet of the pressure-reducing turbine unit (12) and a high-temperature side inlet of a thermal station (16), a #6 gate valve (14) is arranged between a low-temperature side outlet of the pressure-isolated station plate heat exchanger (24) and a high-temperature side inlet of the thermal station (16), a #7 gate valve (17) is arranged between a high-temperature side outlet of the thermal station (16) and an inlet of a primary network circulating pump (18), a #7 gate valve (19) is arranged between a high-temperature side outlet of the pressure-isolating station plate heat exchanger (22) and a back-return water pump (11).
4. The pressure-isolated station zero-temperature-drop heating system based on the high-back-pressure unit as claimed in claim 1, wherein a #1 regulating valve (2) is connected between a water side inlet and a water side outlet of the high-back-pressure condenser (1), a #2 regulating valve (6) is connected between a water side inlet and a water side outlet of the head steam heater (5), a #3 regulating valve (9) is connected between a high-temperature side inlet and a high-temperature side outlet of the pressure-isolated station plate heat exchanger (24), and a #4 regulating valve (15) is connected between a low-temperature side inlet and a low-temperature side outlet of the pressure-isolated station plate heat exchanger (24).
5. The pressure-isolated station zero-temperature-drop heating system based on the high-back-pressure unit is characterized in that a dirt separator (20) is arranged between the outlet of the high-temperature side of the heat station (16) and the inlet of the water return booster pump (22).
6. The zero-temperature-drop heating system for the pressure isolation station based on the high back pressure unit is characterized in that two bypasses are arranged between the inlet and the outlet of the return water boosting pump (22), a water hammer-proof check valve (21) is arranged on one bypass, and a static pressure control pump (23) is arranged on the other bypass.
7. The working method of the zero temperature drop heating system of the pressure isolation station based on the high back pressure unit as set forth in claim 1 to 6, characterized in that it comprises:
and (3) under a common working condition:
when the heat load or the return water temperature of the primary network heat supply network is lower than a preset value, the pressure reduction turbine unit (12) and the return water booster pump (22) are not put into operation, and the plate heat exchanger (24) of the pressure isolation station separates the system into a zero secondary network and a primary network; on the zero-time network side, circulating water of a heat supply network firstly enters a high-backpressure condenser (1) for heating and then enters a first-station steam heater (5) for further heating and temperature rise, and circulating power is provided by a first-station zero-time circulating pump (4); on the primary network side, the low-temperature side water outlet of the pressure-isolating station plate heat exchanger (24) is sent to a heating power station (16) through a water supply pipeline, after releasing heat, the water returns to the low-temperature side inlet of the pressure-isolating station plate heat exchanger (24) from a water return pipeline to perform the next heat exchange cycle, and the cycle power is provided by a pressure-isolating station primary network circulating pump (18); the temperature of the circulating water entering the heat supply network of the high back pressure condenser (1) is higher than the temperature of the return water of the heat station (16);
zero temperature drop working condition of the pressure isolation station:
when the heat load or the return water temperature of the primary network heat supply network is higher than a preset value, the plate heat exchanger (24) of the pressure isolation station is not put into operation; the zero secondary network is directly communicated with the primary network, backwater of the heating station (16) enters the high-back-pressure condenser (1) for heating through the backwater booster pump (22), then enters the first-station steam heater (5) for further heating and temperature rise, is decompressed through the decompression turbine unit (12), and then enters the heating station (16) for heat exchange; the temperature of the circulating water entering the high back pressure condenser (1) in the heat supply network is equal to the temperature of the return water of the heat station (16).
8. The working method of the pressure-isolated station zero-temperature-drop heating system based on the high-back-pressure unit as claimed in claim 7, wherein under a normal working condition, the first station zero-time circulating pump (4) and the pressure-isolated station primary network circulating pump (18) both adopt an inlet constant-pressure operation mode; under the zero temperature drop working condition of the pressure isolation station, the first-station zero-time circulating pump (4) and the return water booster pump (22) are operated in series, the first-station zero-time circulating pump (4) adopts an outlet constant-pressure operation mode, and the return water booster pump (22) adopts a flow feedback control operation mode.
9. The operating method of the pressure-isolated station zero-temperature-drop heating system based on the high-back-pressure unit as recited in claim 7, characterized in that under the pressure-isolated station zero-temperature-drop condition, the pressure-reducing turbine unit (12) reduces the zero-time network water supply pressure to the primary network water supply pressure, and the return water booster pump (22) increases the primary network return water pressure to the zero-time network return water pressure.
10. The working method of the pressure-isolating station zero-temperature-drop heating system based on the high-back-pressure unit is characterized in that under the pressure-isolating station zero-temperature-drop working condition, potential energy generated by pressure reduction of the pressure reduction turbine unit (12) drives the water return booster pump (22), and a part with insufficient power is supplied by the motor.
CN202210929018.4A 2022-08-03 2022-08-03 Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system Pending CN115307208A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210929018.4A CN115307208A (en) 2022-08-03 2022-08-03 Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system

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Application Number Priority Date Filing Date Title
CN202210929018.4A CN115307208A (en) 2022-08-03 2022-08-03 Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system

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CN202210929018.4A Pending CN115307208A (en) 2022-08-03 2022-08-03 Zero-temperature-drop heat supply system of pressure isolation station based on high back pressure unit and working method of zero-temperature-drop heat supply system

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