CN112944448A - Centralized arrangement type large temperature difference heat supply system of pressure isolation station - Google Patents
Centralized arrangement type large temperature difference heat supply system of pressure isolation station Download PDFInfo
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- CN112944448A CN112944448A CN202110406949.1A CN202110406949A CN112944448A CN 112944448 A CN112944448 A CN 112944448A CN 202110406949 A CN202110406949 A CN 202110406949A CN 112944448 A CN112944448 A CN 112944448A
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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
- F24D19/00—Details
- F24D19/0002—Means for connecting central heating radiators to circulation pipes
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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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
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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
- 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
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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Abstract
The invention discloses a pressure-isolating station centralized arrangement type large-temperature-difference heat supply system which comprises a thermal power plant and a plurality of pressure-isolating station centralized arrangement units, wherein the thermal power plant is connected with a primary network heat supply network circulating water return pipeline through a primary network heat supply network circulating water supply pipeline, and an inlet pipeline and an outlet pipeline of each pressure-isolating station centralized arrangement unit are respectively connected with the primary network heat supply network circulating water supply pipeline and the primary network heat supply network circulating water return pipeline. Compared with the method that the heat pump is arranged at the user side, the method has the advantages that the occupied area is small, and the manufacturing cost is relatively low; the pressure isolation stations are intensively provided with units, so that the influence of the heat exchange end difference of the pressure isolation stations on the temperature difference of circulating water of a heat supply network can be effectively counteracted; meanwhile, the centralized arrangement unit of the pressure isolation station can ensure that the COP (coefficient of performance) of the heat pump can reach 4.5-7, the efficiency is higher, and a driving mode can be selected according to the diversity of conditions of system arrangement; the invention is suitable for the pressure isolation station adopted by the long-distance large-temperature-difference heating system. The invention is suitable for the technical field of heat supply energy sources.
Description
Technical Field
The invention belongs to the technical field of heat supply energy sources, and particularly relates to a centralized arrangement type large-temperature-difference heat supply system of a pressure isolation station.
Background
Along with the rapid increase of urban construction speed, in order to meet the environmental protection requirements of energy conservation and emission reduction, a newly-built heat source is farther and farther from a heat supply area, and the heat supply radius is larger and larger, so that the application of pressure-isolating stations is increasingly increased. The caliber of the urban heat supply pipe network reaches DN1400, and if the pipe diameter is continuously increased to improve the conveying capacity of the pipe network, a plurality of difficulties are increased, so that the realization is impossible. Therefore, the method of increasing the temperature difference between supply water and return water by using the existing pipe network is adopted to improve the transportation capacity of the pipe network so as to increase the heat supply amount, and the mode is more and more applied to the existing urban long-distance heat supply engineering. The large-temperature-difference long-distance heat supply engineering has the characteristics of long heat supply pipeline, large height difference and the like, safety measures such as pressure isolation stations are arranged on a system main pipe network in order to overcome potential safety hazards caused by overlarge terrain height difference in a heat supply area, the problem that a primary network direct supply system is too large in height difference of the whole system is solved, when the constant pressure of the system meets the water filling height of the system, the situation that a system is not enough for heat users and equipment pressure bearing can be caused, and when the constant pressure of the system meets the equipment pressure bearing, the situation that the water is not full at the high position of the system can occur. And the end difference of the pressure isolation station can influence the temperature of the circulating water of a heat supply network of a heat user, and particularly for large-temperature-difference waste heat utilization projects, the arrangement of the pressure isolation station influences the economical efficiency of the whole system.
The current large temperature difference heating system mainly comprises the following components:
1) the heat source end user side adopts an absorption heat pump large temperature difference heat supply system: the system is provided with a steam absorption heat pump and a conventional heat exchanger at a heat source end, uses the exhaust steam of a steam turbine to preheat the return water of a heat supply network, uses circulating cooling water as a low-level heat source of the absorption heat pump, and uses part of the extracted steam heat source to drive the absorption heat pump to heat the circulating water of the heat supply network so as to recover the power generation waste heat of a power plant. The user side heats the secondary network to supply hot water by adopting a mode of combining the hot water absorption heat pump and the water-water heat exchanger, the temperature difference between the supply water and the return water of the heat network is increased, and meanwhile, the heat pump at the user side does not need external energy sources as driving force. The technology has the advantages that part of the waste heat of the power plant is recovered, and the tail end heat pump does not need to be driven by external energy. The defects are that the absorption heat pumps are required to be arranged at the user side, the implementation difficulty is high, and the investment is high.
2) The heat source end high back pressure user side absorption heat pump large temperature difference heat supply system comprises: the system is provided with a high-backpressure condenser at a heat source end, primary heating is carried out on heat supply network circulating water by utilizing steam exhausted from a low-pressure cylinder of a steam turbine, secondary heating is carried out on the heat supply network circulating water by utilizing medium-exhaust steam extraction, energy cascade utilization is realized, and power generation waste heat of a power plant is utilized as far as possible. The user side heats the secondary network to supply hot water by adopting a mode of combining the hot water absorption heat pump and the water-water heat exchanger, the temperature difference between the supply water and the return water of the heat network is increased, and meanwhile, the heat pump at the user side does not need external energy sources as driving force. The technology has the advantages that the waste heat utilization rate of the power plant is high, and the tail end heat pump does not need to be driven by external energy. The heat source end has higher requirement on the temperature of return water, the temperature of the return water is high, the economical efficiency is influenced, a generator set is required to fix the power by heat, the flexibility of the generator set is poor, the implementation difficulty of a user side is high, and the investment is high.
Application No.: 200810101065X Chinese invention patent discloses a large temperature difference central heating system, which comprises a steam turbine, a condenser, a steam absorption heat pump, a steam-water heat exchanger, a connecting pipeline and accessories. The invention is mainly characterized in that: the heat supply temperature difference of the heat supply network is large, and is increased by about one time compared with the operation of the conventional heat supply network, so that the conveying capacity of the heat supply network can be greatly increased, and meanwhile, the heat supply return water temperature is low, the problems of heat preservation and thermal stress compensation do not exist, and the investment of a return water pipe network and the whole pipe network can be further reduced; the exhaust steam of the steam turbine is utilized to preheat the return water of the large heat supply network, and the circulating water is utilized as a low-level heat source of the absorption heat pump, so that the waste heat generated in the power generation process of the power plant is recovered to the greatest extent; the secondary network is heated to supply hot water by adopting a mode of combining a hot water absorption heat pump and a water-water heat exchanger at the tail end, the supply and return water temperatures of the large heat supply network are increased, and meanwhile, the heat pump does not need an external heat source as a driving force. The invention is the most common large temperature difference heating system, but does not relate to a pressure isolation station, and the absorption heat pumps are arranged at end users, so the implementation is difficult and the manufacturing cost is high.
Application No.: 2016103142249 Chinese patent application discloses a system and method for supplying heat by one network with large temperature difference, wherein a self-driven heat pump is installed in parallel between a network water supply pipeline and a network water return pipeline at the upstream of a heat supply system, and a plurality of heat exchange stations for supplying heat to users are installed in parallel between a network water supply pipeline and a network water return pipeline at the downstream of the heat supply system; a group of self-driven heat pumps at the upstream of the heating system corresponds to a plurality of heat exchange stations at the downstream of the heating system. The low-temperature water supply and return temperature difference of the grid water is effectively increased by means of the self-driven heat pump, the heat supply capacity of a heat supply network system is greatly improved, energy is saved, consumption is reduced, and meanwhile the problem that the low-temperature water return of the grid water cannot be realized because a large-temperature-difference heat exchange unit cannot be installed in a heat exchange station due to space or other reasons is effectively solved. Although the invention overcomes the defect that the heat pump is arranged at the end of the user, the invention does not relate to the pressure isolation station and does not combine with the pressure isolation station system to overcome the influence of the pressure isolation station on the large-temperature-difference heating system, and the heat pump used by the invention is a self-driven heat pump and has higher application conditions.
Application No.: 2016107635989 Chinese patent application discloses an electrically driven heat pump large temperature difference waste heat recovery heat supply unit, which comprises a first-stage heat exchange station and a second-stage heat exchange station, wherein the first-stage heat exchange station comprises a return water heater, a plurality of second-stage electrically driven heat pumps connected in series, a condensate water heat exchanger, a plurality of first-stage electrically driven heat pumps connected in series and a peak heater, the second-stage heat exchange station comprises a plate heat exchanger and a third-stage electrically driven heat pump connected in series, a primary net return water sequentially passes through the return water heater and the plurality of second-stage electrically driven heat pumps connected in series, the primary network water supply after heat release in the plate heat exchanger sequentially enters three-level electrically driven heat pumps which are connected with different heat pump working media and different heat pump circulating systems in series, and the water after full heat release and temperature reduction enters a return water heater again as primary network return water; the secondary network backwater is divided into two paths, and the two paths of backwater respectively enter the plate heat exchanger and the three-level electric drive heat pump to absorb heat and raise temperature, and the backwater is converged after the temperature is raised and is output to a heat user as secondary network water supply. The invention adopts a multistage electrically-driven heat pump to improve the heat supply temperature difference and increase the transport capacity of a heat supply network, but does not relate to a pressure isolation station or combine with a pressure isolation station system to overcome the influence of the pressure isolation station on a large temperature difference heat supply system.
Disclosure of Invention
The invention provides a centralized large-temperature-difference heating system of a pressure isolation station, which is used for solving the technical problem.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a separate big difference in temperature heating system of centralized arrangement formula of pressure station, includes that thermal power plant and a plurality of separate pressure station are concentrated and are arranged the unit, and the thermal power plant passes through once net heat supply network circulating water supply pipe and once net heat supply network circulating water return pipe and connects, and each separates pressure station and concentrates the inlet pipeline and the outlet pipeline of arranging the unit and be connected with once net heat supply network circulating water supply pipe and once net heat supply network circulating water return pipe respectively.
Furthermore, the pressure isolation station centralized arrangement unit comprises a pressure isolation station and a compression heat pump, an inlet and an outlet of a heat exchanger of the pressure isolation station are respectively communicated with a primary network heat supply network circulating water supply pipeline and a primary network heat supply network circulating water return pipeline, a secondary network heat supply network circulating water supply pipeline behind the pressure isolation station and a secondary network heat supply network circulating water return pipeline behind the pressure isolation station are respectively connected with the pressure isolation station, a plurality of heat using units connected in parallel are arranged between the secondary network heat supply network circulating water supply pipeline behind the pressure isolation station and the secondary network heat supply network circulating water return pipeline behind the pressure isolation station, an inlet and an outlet of an evaporator of the compression heat pump are respectively connected with a communication pipeline at the inlet of the heat exchanger of the pressure isolation station, a first regulating valve is arranged on the communication pipeline and between the inlet and the outlet of the evaporator of the compression heat pump, an inlet and an outlet of a condenser of the compression heat pump are respectively communicated with the secondary network heat supply network circulating water return pipeline behind the, and a second regulating valve is arranged on a circulating water return pipeline of the primary network heat supply network behind the pressure isolation station and between an inlet and an outlet of a condenser of the compression heat pump.
Furthermore, the heat utilization unit comprises plate heat exchangers respectively connected with a pressure-isolated station back primary network heat supply network circulating water supply pipeline and a pressure-isolated station back primary network heat supply network circulating water return pipeline, and the plate heat exchangers supply heat to heat users through pipelines.
Furthermore, the heat consumer is connected in parallel with a bypass pipe, and a heat supply network circulating water bypass door is installed on the bypass pipe.
Furthermore, a heat pump starting water tank is communicated with a pipeline communicated with the inlet of the heat exchanger of the compression heat pump through a heat pump starting water replenishing pump, and a heat pump starting water replenishing regulating valve is installed on an outlet pipe of the heat pump starting water replenishing pump.
Furthermore, a pressure station post primary network heat supply network circulating water bypass is communicated between the pressure station post primary network heat supply network circulating water supply pipeline and the pressure station post primary network heat supply network circulating water return pipeline, and a pressure station post primary network heat supply network circulating water bypass stop valve is installed on the pressure station post primary network heat supply network circulating water bypass.
Furthermore, a pressure-isolating station rear primary network heat supply network circulating water pump is arranged on the pressure-isolating station rear primary network heat supply network circulating water supply pipeline.
Furthermore, a pressure-isolating station primary pipe network regulating valve is installed on an inlet pipeline of the pressure-isolating station centralized arrangement unit.
Furthermore, a primary pipe network bypass is communicated between the primary network heat supply network circulating water supply pipeline and the primary network heat supply network circulating water return pipeline, and a primary pipe network bypass stop valve is installed on the primary pipe network bypass.
Due to the adoption of the structure, compared with the prior art, the invention has the technical progress that: the centralized arrangement unit of the pressure isolation stations is adopted, heat pumps do not need to be arranged at all user sides, and compared with the method that the heat pumps are arranged at the user sides, the heat pumps occupy less land and have relatively low manufacturing cost; the pressure isolation stations are intensively provided with units, so that the influence of the heat exchange end difference of the pressure isolation stations on the temperature difference of circulating water of a heat supply network can be effectively counteracted; meanwhile, the centralized arrangement unit of the pressure isolation station can ensure that the COP (coefficient of performance) of the heat pump can reach 4.5-7, the efficiency is higher, and a driving mode can be selected according to the diversity of conditions of system arrangement; the invention is suitable for the pressure isolation station adopted by the long-distance large-temperature-difference heating system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
fig. 1 is a structural arrangement diagram of an embodiment of the present invention.
Labeling components: 101-a thermal power plant; 102-a pressure isolation station; 103-compression heat pump drive; 104-heat pump starting water tank; 105-starting a water replenishing pump by the heat pump; 106-a compression heat pump; 107-a primary network heat supply network circulating water pump behind the pressure isolation station; 108-heat consumer-plate heat exchanger; 109-hot user one; 110-heat consumer two-plate heat exchanger; 111-hot user two; 112-heat consumer three-plate heat exchanger; 113-hot user three; 201-a primary pipe network regulating valve of a pressure isolation station; 202-a primary pipe network regulating valve of a second pressure isolation station; 203-a primary pipe network bypass stop valve; 204-a first regulating valve; 205-a second regulating valve; 206-the heat pump starts the water replenishing regulating valve; 207-a primary network heat supply network circulating water bypass stop valve behind the pressure isolation station; 208-heat consumer-heat network circulating water bypass door; 209-heating network circulating water bypass door of heating user II; 210-a heat consumer three-heat-supply-network circulating water bypass door; 301-a primary network heat supply network circulating water supply pipeline; 302-a primary network heat supply network circulating water return pipeline; 303-a primary network heat supply network circulating water supply pipeline behind the pressure isolation station; 304-a primary network heat supply network circulating water return pipeline behind the pressure isolation station.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present invention.
The invention discloses a pressure-isolating station centralized arrangement type large-temperature-difference heat supply system which comprises a thermal power plant 101 and a plurality of pressure-isolating station 102 centralized arrangement units, wherein the thermal power plant 101 is connected with a primary network heat supply network circulating water supply pipeline 301 and a primary network heat supply network circulating water return pipeline 302 through the primary network heat supply network circulating water supply pipeline 301, and an inlet pipeline and an outlet pipeline of each pressure-isolating station 102 centralized arrangement unit are respectively connected with the primary network heat supply network circulating water supply pipeline 301 and the primary network heat supply network circulating water return pipeline 302. Wherein, the pressure isolation station 102 centralized arrangement unit comprises a pressure isolation station 102 and a compression heat pump 106, the inlet and outlet of the heat exchanger of the pressure isolation station 102 are respectively communicated with a primary network heat supply network circulating water supply pipeline 301 and a primary network heat supply network circulating water return pipeline 302, the pressure isolation station post-primary network heat supply network circulating water supply pipeline 303 and the pressure isolation station post-primary network heat supply network circulating water return pipeline 304 are respectively connected with the pressure isolation station 102, a plurality of heat using units connected in parallel are arranged between the pressure isolation station post-primary network heat supply network water supply pipeline 303 and the pressure isolation station post-primary network circulating water return pipeline 304, the inlet and outlet of the evaporator of the compression heat pump 106 are respectively connected with the communication pipeline at the inlet of the heat exchanger of the pressure isolation station 102, a first regulating valve 204 is arranged on the communication pipeline and between the inlet and outlet of the evaporator of the compression heat pump 106, the inlet and outlet of the condenser of the compression heat pump 106 are respectively communicated with the pressure isolation station post-primary network circulating water return pipeline 304, and a second regulating valve 205 is arranged on a circulating water return pipeline 304 of the primary network heat supply network behind the pressure insulation station and between the inlet and the outlet of the condenser of the compression heat pump 106. The compression heat pump 106 of the present embodiment is driven by the compression heat pump driving device 103 to operate.
As a preferred embodiment of the present invention, the heat unit comprises plate heat exchangers respectively connected to the pressure-isolated post-primary-network heat supply network circulating water supply pipeline 303 and the pressure-isolated post-primary-network heat supply network circulating water return pipeline 304, and the plate heat exchangers supply heat to heat users through pipelines. In this embodiment, three heat users are taken as an example, the first plate heat exchanger 108 of the heat user exchanges heat with the first heat user 109, the second plate heat exchanger 110 of the heat user exchanges heat with the second heat user 111, and the third plate heat exchanger 112 of the heat user exchanges heat with the third heat user 113. Each heat consumer is connected in parallel with a bypass pipe, and a heat consumer one-heat-supply-network circulating water bypass door 208, a heat consumer two-heat-supply-network circulating water bypass door 209 and a heat consumer three-heat-supply-network circulating water bypass door 210 are respectively installed on each bypass pipe. In the embodiment, a heat pump starting water tank 104 is communicated with a pipeline communicated with an inlet of a heat exchanger of the pressure insulation station 102 through a heat pump starting water replenishing pump 105 on an evaporator inlet of a compression heat pump 106, and a heat pump starting water replenishing regulating valve 206 is installed on an outlet pipe of the heat pump starting water replenishing pump 105. In this embodiment, a pressure station 102 post-primary network heat supply network circulating water bypass is communicated between the pressure station post-primary network heat supply network circulating water supply pipeline 303 and the pressure station post-primary network heat supply network circulating water return pipeline 304, and a pressure station 102 post-primary network heat supply network circulating water bypass stop valve 207 is installed on the pressure station 102 post-primary network heat supply network circulating water bypass. And a pressure-isolated station back primary network heat supply network circulating water pump 107 is installed on the pressure-isolated station back primary network heat supply network circulating water supply pipeline 303.
As a preferred embodiment of the present invention, the pressure-isolating station 102 primary pipe network regulating valve is installed on the inlet pipe of the pressure-isolating station 102 centralized arrangement unit, in this embodiment, for example, two pressure-isolating station 102 centralized arrangement units are adopted, and a first pressure-isolating station primary pipe network regulating valve 201 and a second pressure-isolating station primary pipe network regulating valve 202 are respectively installed on the inlet pipe of the two pressure-isolating station 102 centralized arrangement units. A primary pipe network bypass is communicated between the primary heat supply network circulating water supply pipeline 301 and the primary heat supply network circulating water return pipeline 302, and a primary pipe network bypass stop valve 203 is installed on the primary pipe network bypass.
The technical scheme includes that a compression heat pump 106 is arranged at a pressure isolation station 102, return water on the side of a primary pipe network of the pressure isolation station 102 is introduced into an evaporator of the compression heat pump 106 for cooling, return water on a secondary pipe network of the pressure isolation station 102 is introduced into a condenser of the compression heat pump 106 for heating, and then the return water is sent to the pressure isolation station 102 and mixed with water supplied to the secondary pipe network, so that the purpose of reducing the total return water temperature of the primary pipe network of the thermal power plant 101 is achieved, and meanwhile, the transport power of the heat network after the pressure isolation station 102 is.
The system flow of the invention is as follows:
1) and the previous network side system process of the pressure isolation station 102: the heat supply network circulating water supply water heated by the self-heating power plant 101 flows from a primary network circulating water supply pipeline 301 to a pressure isolation station 102, enters a heat exchanger of the pressure isolation station 102 for heat exchange and then is divided into two paths, and one path returns to a primary heat supply network circulating water return pipeline; one path of the heat is continuously released to the evaporator of the compression heat pump 106, and the heat supply network circulating water absorbed by the evaporator of the compression heat pump 106 flows to a primary heat supply network circulating water return pipeline to be mixed and flows to the thermal power plant 101; the flow of the circulating water on the previous network side flowing to the pressure-isolating station 102 of the other pressure-isolating stations 102 is the same as the above-mentioned flow.
2) And the next network side system flow of the pressure isolation station 102: the back primary heat supply network circulating water backwater of the pressure isolation station 102 for self-heating user heat exchange flows to the vicinity of the pressure isolation station 102 from a back primary heat supply network circulating water backwater pipeline 304 of the pressure isolation station and is divided into two paths, one path of the backwater is connected to a condenser of the compression heat pump 106 for absorbing heat, and the heat supply network circulating water heated by the condenser of the compression heat pump 106 flows to a back primary heat supply network circulating water supply pipeline 303 of the pressure isolation station; one path enters the heat exchanger of the pressure insulation station 102 for heat exchange, and the heat supply network circulating water heated by the heat exchanger of the pressure insulation station 102 flows to the primary network circulating water supply pipeline 303 after the pressure insulation station and is mixed with the circulating water heated by the compression heat pump 106 to be supplied to each heat user. The flow of the circulating water on the last network side after flowing to the pressure-isolating stations 102 of other pressure-isolating stations 102 is the same as the above-mentioned flow.
3) And a secondary station side system flow: the back primary heat supply network circulating water supply water of the pressure isolation station 102 from the pressure isolation station back primary heat supply network circulating water supply pipeline 303 flows to a heat user plate heat exchanger to heat the secondary network circulating water and then flows to the pressure isolation station back primary network circulating water return pipeline 304 for circulation; the second network heat supply network circulating water which releases heat from the first heat supply user 109 flows to the first heat supply user plate heat exchanger 108 to be heated by the first network circulating water and then supplied to the heat supply user, and the circulation is carried out. The hot-user-hot-network circulating water bypass door 208 may bypass the secondary-network hot-network circulating water when the hot-user equipment fails. The flow of the secondary network heat supply network circulating water flowing to other heat users is the same as the flow.
4) And a starting system flow of the evaporator of the compression heat pump 106: when the system is started to operate, due to factors such as delay of operation of a heat user side, the temperature of circulating water of a primary network heat supply network from a heat exchanger of the pressure isolation station 102 to an evaporator of the compression heat pump 106 is possibly higher than 50 ℃, at the moment, the heat pump starting water replenishing pump 105 needs to be started, the heat pump starting water replenishing regulating valve 206 is opened, cold water of the heat pump starting water tank 104 is replenished to the circulating water of the primary network heat supply network to the evaporator of the compression heat pump 106, and the temperature of the circulating water of the primary network heat supply network is reduced to below 50 ℃.
The adjusting method comprises the following steps:
the system of the invention adjusts the target and means, under the premise that the temperature pressure head of the compression heat pump 106 meets the heat supply requirement of the heat user, COP takes the maximum value.
In the formula: COP is the compression heat pump 106 efficiency; q. q.smThe flow rate of the circulating water of the next heat supply network is the flow rate of the circulating water of the pressure isolation station 102 of the condenser of the compression heat pump 106; t is t1The condenser outlet water temperature of the compression heat pump 106; t is t2The inlet water temperature of the condenser of the compression heat pump 106; c is the specific heat capacity of water; w is the output power of the compression heat pump driving apparatus 103.
ΔT＝t1-t3
in the formula: t is t1The condenser outlet water temperature of the compression heat pump 106; t is t3The outlet water temperature of the evaporator of the compression heat pump 106.
Efficiency of the compression heat pump 106 versus temperature head:
COP＝0.0001×ΔT2-0.1524×ΔT+10.966
the system adjusting means can adjust the efficiency of the compression heat pump 106 and the heat load thereof by adjusting the following equipment in the system of the invention:
increasing the frequency of the primary network heat supply network circulating water pump 107 behind the pressure isolation station can increase the circulating water flow of the primary network heat supply network behind the pressure isolation station 102;
increasing the opening of the second regulator valve 205 increases the flow of the circulating water into the condenser of the compression heat pump 106;
increasing the opening of the first regulator valve 204 increases the flow of circulating water into the evaporator of the compression heat pump 106;
the invention is mainly characterized in the following four aspects:
the first step, the pressure isolation station 102 is intensively provided with units, so that the large temperature difference operation of a heat supply network is realized, and the transportation capacity of the heat supply network is increased;
secondly, after the system is applied, the return water temperature of the heat supply network in front of the pressure isolation station 102 can be lower than that of the heat supply network behind the pressure isolation station 102, the influence of the heat exchange of the pressure isolation station 102 on improving the return water temperature of the primary network is overcome, and particularly for large-temperature-difference waste heat utilization engineering, the system can improve the economy of the whole system;
thirdly, the driving device 103 of the compression heat pump in the system of the present invention may be a driving device such as a variable frequency motor, a gas turbine or a back pressure turbine, if the tail flue gas of the gas turbine can be used to further heat the circulating water of the heat supply network heated by the condenser of the compression heat pump 106 and then sent to the heat consumer, if the tail flue gas of the gas turbine can be used to further heat the circulating water of the heat supply network heated by the condenser of the compression heat pump 106, the exhaust gas of the back pressure turbine can be used to further heat the circulating water of the heat supply network heated by the.
Fourthly, when the system of the invention is started and operated, if the temperature of the circulating water return water of the primary network heat supply network from the heat exchanger of the pressure isolation station 102 to the evaporator of the compression heat pump 106 is higher than 50 ℃, the heat pump starting water replenishing pump 105 is started, the heat pump starting water replenishing regulating valve 206 is opened, the cold water of the heat pump starting water tank 104 is replenished to the circulating water return water of the primary network heat supply network of the evaporator of the compression heat pump 106, and the temperature of the circulating water return water of the primary network heat supply network is reduced to below 50 ℃.
Preferred embodiments:
1012 MW extraction and condensation of a thermal power plant are steam turbine units, one unit is subjected to high back pressure heat supply transformation, the power plant supplies heat to a certain city which is 30km away from the power plant, the length of a primary heat pipe network is 30km, the height difference between two places is 130m, a pressure isolation station 102 is arranged in the middle, 5 heat exchangers are arranged in the pressure isolation station 102, the front pipe diameter DN1000 of the pressure isolation station 102 and the rear pipe diameter DN1200 of the pressure isolation station 102, the water supply temperature before the current pipeline runs the pressure isolation station 102 is 120 ℃, the water return temperature is 50 ℃, the maximum heat network circulating water quantity is 8000t/h, the water supply temperature after the pressure isolation station 102 is 115 ℃, the water return temperature is 45 ℃, the water return temperature difference between the front side and the rear side of the pressure isolation station 102 is 5. As the urbanization process is accelerated, the city needs to increase about 116MW heating heat load, and a heat supply network system is required to be modified.
According to the system, 5 electrically-driven compression heat pumps 106 are correspondingly arranged in front of and behind 1025 heat exchangers in the pressure isolation station, the power of a single electrically-driven compression heat pump 106 is 23.27MW, the output power of a driving motor is 4.6MW, a primary pipe network regulating valve is arranged on a primary pipe network return water pipeline of each pressure isolation station 102 heat exchanger, the primary pipe network return water is led to an evaporator of the electrically-driven compression heat pump 106, and the circulating water after heat exchange of the evaporator is connected to a primary pipe network circulating water return pipeline 302; a compression heat pump 106 regulating valve is arranged on a primary network heat supply network circulating water return pipeline 302 behind each pressure isolation station 102 heat exchanger, the primary network heat supply network circulating water return water behind the pressure isolation station 102 heat exchanger is led to an electrically-driven compression heat pump 106 condenser, and the circulating water after heat exchange of the cooler is connected to a primary network heat supply network circulating water supply pipeline 303 behind the pressure isolation station. Each electrically driven compression heat pump 106 is provided with a heat pump starting water tank 104, a heat pump starting water replenishing pump 105, a heat pump starting water replenishing regulating valve 206 and corresponding pipelines.
After the improvement, the flow rate of the circulating water of the primary network heat supply network before the heat exchanger of each pressure isolation station 102 is connected to the pressure isolation station 102 of the evaporator of the electrically-driven compression heat pump 106 is about 800t/h, the inlet temperature is 50 ℃, the outlet temperature is 30 ℃, the flow rate of the circulating water of the primary network heat supply network after the pressure isolation station 102 of the condenser of the electrically-driven compression heat pump 106 is about 800t/h, the inlet temperature is 45 ℃, the outlet temperature is 70 ℃, the COP of the electrically-driven compression heat pump 106 is 5, the temperature head 40, the water discharged by the electrically-driven compression heat pump 106 is mixed with the original circulating water, the temperature of the circulating water of the primary network heat supply network of the thermal power plant 101 is 40 ℃, the temperature of the circulating water supply of the primary network heat supply network after the pressure isolation station 102 at the user side is 100 ℃, and the total heat. The temperature of the circulating water return of the primary network of the thermal power plant 101 before the pressure isolation station 102 is modified is 40 ℃ lower than that of the circulating water return of the primary network of the thermal power plant 101 after the pressure isolation station 102, the temperature difference of the return water of the front side and the rear side of the pressure isolation station 102 is-5 ℃, and the utilization ratio of the waste heat of the thermal power plant 101 can be greatly increased after the temperature of the circulating water return of the primary network of the thermal power plant 101 after the modification is 40 ℃.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a separate big difference in temperature heating system of centralized arrangement of pressure station which characterized in that: the thermal power plant is connected with a primary network heat supply network circulating water supply pipeline and a primary network heat supply network circulating water return pipeline through the primary network heat supply network circulating water supply pipeline and the primary network heat supply network circulating water return pipeline, and an inlet pipeline and an outlet pipeline of the centralized arrangement unit of each pressure isolation station are respectively connected with the primary network heat supply network circulating water supply pipeline and the primary network heat supply network circulating water return pipeline.
2. The centralized large temperature difference heating system of the pressure isolation station as claimed in claim 1, wherein: the centralized arrangement unit of the pressure isolation station comprises a pressure isolation station and a compression heat pump, wherein an inlet and an outlet of a heat exchanger of the pressure isolation station are respectively communicated with a primary network circulating water supply pipeline and a primary network circulating water return pipeline, a secondary network circulating water supply pipeline behind the pressure isolation station and a secondary network circulating water return pipeline behind the pressure isolation station are respectively connected with the pressure isolation station, a plurality of heat using units which are connected in parallel are arranged between the primary network circulating water supply pipeline behind the pressure isolation station and the secondary network circulating water return pipeline behind the pressure isolation station, an inlet and an outlet of an evaporator of the compression heat pump are respectively connected with a communication pipeline at the inlet of the heat exchanger of the pressure isolation station, a first regulating valve is arranged on the communication pipeline and between the inlet and the outlet of the evaporator of the compression heat pump, an inlet and an outlet of a condenser of the compression heat pump are respectively communicated with the primary network circulating water return pipeline behind the pressure isolation station, and a second regulating valve is arranged on a circulating water return pipeline of the primary network heat supply network behind the pressure isolation station and between an inlet and an outlet of a condenser of the compression heat pump.
3. The centralized large temperature difference heating system of the pressure-isolating station as claimed in claim 2, wherein: the heat utilization unit comprises plate heat exchangers respectively connected with a pressure-isolated station back primary network heat supply network circulating water supply pipeline and a pressure-isolated station back primary network heat supply network circulating water return pipeline, and the plate heat exchangers supply heat to heat users through pipelines.
4. The centrally-arranged large-temperature-difference heating system of the pressure-isolating station as claimed in claim 3, wherein: the heat consumer is connected with a bypass pipe in parallel, and a heat supply network circulating water bypass door is installed on the bypass pipe.
5. The centralized large temperature difference heating system of the pressure-isolating station as claimed in claim 2, wherein: and a heat pump starting water tank is communicated with a pipeline communicated with the inlet of the heat exchanger of the compression heat pump and the inlet of the heat exchanger of the pressure isolation station through a heat pump starting water replenishing pump, and a heat pump starting water replenishing regulating valve is installed on an outlet pipe of the heat pump starting water replenishing pump.
6. The centralized large temperature difference heating system of the pressure-isolating station as claimed in claim 2, wherein: and a pressure station back primary network heat supply network circulating water bypass is communicated between the pressure station back primary network heat supply network circulating water supply pipeline and the pressure station back primary network heat supply network circulating water return pipeline, and a pressure station back primary network heat supply network circulating water bypass stop valve is installed on the pressure station back primary network heat supply network circulating water bypass.
7. The centralized large temperature difference heating system of the pressure-isolating station as claimed in claim 2, wherein: and a pressure-isolating station rear primary network heat supply network circulating water pump is arranged on the pressure-isolating station rear primary network heat supply network circulating water supply pipeline.
8. The centralized large temperature difference heating system of the pressure isolation station as claimed in claim 1, wherein: and a primary pipe network regulating valve of the pressure isolation station is arranged on an inlet pipeline of the pressure isolation station centralized arrangement unit.
9. The centralized large temperature difference heating system of the pressure isolation station as claimed in claim 1, wherein: a primary pipe network bypass is communicated between the primary network heat supply network circulating water supply pipeline and the primary network heat supply network circulating water return pipeline, and a primary pipe network bypass stop valve is installed on the primary pipe network bypass.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0601019L (en) * | 2006-05-08 | 2007-11-09 | Hans Severinson | A controller for a water-borne heating or cooling system |
| CN101769553A (en) * | 2008-12-30 | 2010-07-07 | 张明亮 | Circulating water heating system of secondary pump |
| EP2331882A2 (en) * | 2008-10-06 | 2011-06-15 | Sunnovations Inc. | Adaptive self pumping solar hot water heating system with overheat protection |
| CN202419765U (en) * | 2012-02-09 | 2012-09-05 | 冀州中科能源有限公司 | Circulating water cooling heating apparatus of turbine condenser in thermal power plant |
| CN203704104U (en) * | 2014-01-10 | 2014-07-09 | 北京新城国泰能源科技有限公司 | Water mixing heat supply device used in heat exchange station |
| CN104456685A (en) * | 2014-05-26 | 2015-03-25 | 宋春节 | Multi-heat-source single-pipe waste heat utilization heat supply system |
| CN105444243A (en) * | 2014-09-02 | 2016-03-30 | 盾安（天津）节能***有限公司 | Waste heat recovery heat supply and water charging system and water charging method |
| CN105953290A (en) * | 2016-05-13 | 2016-09-21 | 湖南同为节能科技有限公司 | First-network water large-temperature-difference heat supplying system and method |
| CN205807597U (en) * | 2016-07-18 | 2016-12-14 | 临沂富达节能科技有限公司 | A kind of temperature utilizing heat pump techniques to extract the big temperature difference realizes the heating system concentrated |
| CN207299103U (en) * | 2017-08-03 | 2018-05-01 | 中清源环保节能有限公司 | A kind of central heating heat distribution pipe network is every pressure heat-exchange system |
| CN110285470A (en) * | 2019-06-25 | 2019-09-27 | 北京源深节能技术有限责任公司 | Mating steam turbine heating plant and its operation method |
| CN211502950U (en) * | 2020-01-22 | 2020-09-15 | 郑州航空港城市运营有限公司 | Large-temperature-difference heat exchange system |
| CN212962283U (en) * | 2020-09-01 | 2021-04-13 | 中国电建集团山东电力建设有限公司 | Air cooling power station waste heat energy source utilization system |
-
2021
- 2021-04-15 CN CN202110406949.1A patent/CN112944448A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0601019L (en) * | 2006-05-08 | 2007-11-09 | Hans Severinson | A controller for a water-borne heating or cooling system |
| EP2331882A2 (en) * | 2008-10-06 | 2011-06-15 | Sunnovations Inc. | Adaptive self pumping solar hot water heating system with overheat protection |
| CN101769553A (en) * | 2008-12-30 | 2010-07-07 | 张明亮 | Circulating water heating system of secondary pump |
| CN202419765U (en) * | 2012-02-09 | 2012-09-05 | 冀州中科能源有限公司 | Circulating water cooling heating apparatus of turbine condenser in thermal power plant |
| CN203704104U (en) * | 2014-01-10 | 2014-07-09 | 北京新城国泰能源科技有限公司 | Water mixing heat supply device used in heat exchange station |
| CN104456685A (en) * | 2014-05-26 | 2015-03-25 | 宋春节 | Multi-heat-source single-pipe waste heat utilization heat supply system |
| CN105444243A (en) * | 2014-09-02 | 2016-03-30 | 盾安（天津）节能***有限公司 | Waste heat recovery heat supply and water charging system and water charging method |
| CN105953290A (en) * | 2016-05-13 | 2016-09-21 | 湖南同为节能科技有限公司 | First-network water large-temperature-difference heat supplying system and method |
| CN205807597U (en) * | 2016-07-18 | 2016-12-14 | 临沂富达节能科技有限公司 | A kind of temperature utilizing heat pump techniques to extract the big temperature difference realizes the heating system concentrated |
| CN207299103U (en) * | 2017-08-03 | 2018-05-01 | 中清源环保节能有限公司 | A kind of central heating heat distribution pipe network is every pressure heat-exchange system |
| CN110285470A (en) * | 2019-06-25 | 2019-09-27 | 北京源深节能技术有限责任公司 | Mating steam turbine heating plant and its operation method |
| CN211502950U (en) * | 2020-01-22 | 2020-09-15 | 郑州航空港城市运营有限公司 | Large-temperature-difference heat exchange system |
| CN212962283U (en) * | 2020-09-01 | 2021-04-13 | 中国电建集团山东电力建设有限公司 | Air cooling power station waste heat energy source utilization system |
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