CN217441606U - Electric boiler heat recovery system and cogeneration unit - Google Patents
Electric boiler heat recovery system and cogeneration unit Download PDFInfo
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- CN217441606U CN217441606U CN202221236226.8U CN202221236226U CN217441606U CN 217441606 U CN217441606 U CN 217441606U CN 202221236226 U CN202221236226 U CN 202221236226U CN 217441606 U CN217441606 U CN 217441606U
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Abstract
The utility model discloses an electric boiler heat recovery system and combined heat and power generation unit, electric boiler heat recovery system include water heat exchanger and heat pump, water heat exchanger once inclines into water end and electric boiler's play water end intercommunication, water heat exchanger once inclines out water end with electric boiler's the end intercommunication of intaking, water heat exchanger's secondary side is intake and is managed the export intercommunication with heat supply network circulating water pump, water heat exchanger's secondary side is returned water end and heat supply network circulating water pump import intercommunication, the waste hot water of heat pump is intake and is held with electric boiler's play water end intercommunication, the waste hot water of heat pump return water end with electric boiler's the end intercommunication of intaking is so that retrieve electric boiler goes out the heat of water, the play water end of heat pump links to each other with low pressure feed water heater's the end of intaking. The utility model provides an electric boiler heat recovery system possesses the super heat supply of recovery electric boiler, reduces the heat supply coal consumption, reduces the advantage of heat supply plant power consumption.
Description
Technical Field
The utility model relates to a thermal power's technical field especially relates to electric boiler heat recovery system and combined heat and power generation unit.
Background
In the foreseeable future electric power market, with the large-scale grid-connected power generation of new energy units such as wind power, photovoltaic and the like, the utilization hours of the thermal power generating unit are continuously reduced, and the deep peak regulation transformation of the thermal power generating unit becomes a great trend. However, the operation flexibility of the thermal power generating unit is improved by deep peak regulation modification, and meanwhile, the energy consumption index of the thermal power generating unit is obviously deteriorated and is obviously contradicted with the energy-saving and consumption-reducing target of the thermal power generating unit.
In the related technology, for a combined heat and power generation unit facing deep peak shaving, the additional electric boiler modification scheme has the advantages of high flexibility, strong peak shaving capability and the like, and is adopted by multiple combined heat and power generation power stations. The technical principle that the electric boiler transformation scheme can enable the cogeneration unit to realize deep peak regulation by a large margin is as follows: the electric boiler can consume surplus output of the unit and make up for the deficiency of heat supply capacity, thereby not only reducing the output of the unit, but also satisfying the requirement of the unit for supplying heat to the outside and successfully realizing thermoelectric decoupling. In actual operation, the main problems existing in the electric boiler transformation scheme are as follows: although the electric boiler can be configured with a plurality of series arrangements simultaneously, in order to meet the deep peak regulation requirement of the cogeneration unit at the beginning and the end of heat supply, even if the heat storage tank is configured simultaneously, a large amount of heat generated by the electric boiler still has an over-supply phenomenon, namely, the heat supply is greater than the external heat supply requirement, the over-supply is restricted by an external heat supply network, the part of the over-supply heat cannot generate economic benefit, a large amount of raw coal is wasted, the power consumption rate of the comprehensive plant of the unit is raised, and the running economy of the unit is influenced.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
Therefore, the embodiment of the utility model provides an electric boiler heat recovery system, this electric boiler heat recovery system have retrieve the super heat supply of electric boiler, reduce the heat supply coal consumption, reduce the advantage of heat supply plant power consumption.
According to the utility model discloses electric boiler heat recovery system, electric boiler heat recovery system include water heat exchanger and heat pump, the side of water heat exchanger is intake the end and is communicate with electric boiler's play water end, the side of water heat exchanger side be out water end with electric boiler's the end intercommunication of intaking, water heat exchanger's secondary side is intake the end and is exported the intercommunication with heat supply network circulating water pump, water heat exchanger's secondary side is returned water end and heat supply network circulating water pump import intercommunication, the waste hot water of heat pump is intake the end and is communicated with electric boiler's play water end, the waste hot water of heat pump return water end with electric boiler's the end intercommunication of intaking so that retrieve electric boiler goes out the heat of water, the play water end of heat pump links to each other with low pressure feed water heater's the end of intaking.
According to the utility model discloses electric boiler heat recovery system has the super heat supply of recovery electric boiler, reduces the heat supply coal consumption, reduces the advantage of heat supply plant power consumption.
In some embodiments, the secondary side water return end is communicated with a water inlet end of a steam-water heat exchanger, and a water outlet end of the steam-water heat exchanger is communicated with an inlet of the heat supply network circulating water pump.
In some embodiments, the driving steam end of the heat pump is communicated with the steam exhaust end of the medium pressure cylinder of the steam turbine, and the hydrophobic end of the heat pump is communicated with the hot well of the condenser.
In some embodiments, a steam inlet end of the steam-water heat exchanger is communicated with a steam exhaust end of an intermediate pressure cylinder of the steam turbine, and a drain end of the steam-water heat exchanger is communicated with the hot well of the condenser.
In some embodiments, the water outlet end of the low pressure heater is in communication with a deaerator.
In some embodiments, the circulating water return end of the condenser is communicated with the water supply end of the cooling tower, the water outlet end of the cooling tower is communicated with the water inlet end of the circulating water pump, the water outlet end of the circulating water pump is communicated with the circulating water inlet end of the condenser, the hot well condensate outlet is communicated with the water inlet end of the condensate pump, and the condensate pump outlet is communicated with the water inlet end of the low-pressure heater.
In some embodiments, a shaft seal heater is arranged between the low-pressure heater and the condensate pump, and a condensate outlet of the shaft seal heater is communicated with a water inlet end of the heat pump.
According to the cogeneration unit of the embodiment of the utility model, the cogeneration unit comprises a boiler, a condenser, a heat pump, an electric boiler and a heat consumer, the main steam of the boiler outlet is communicated with the steam inlet of the high pressure cylinder of the steam turbine, the steam outlet of the medium pressure cylinder of the steam turbine is communicated with the driving steam inlet of the heat pump and the heating steam inlet of the steam-water heat exchanger, the steam outlet of the low pressure cylinder of the steam turbine is communicated with the steam inlet of the condenser, the steam turbine is used for driving the generator to generate electricity, the drain end of the steam-water heat exchanger and the drain end of the heat pump are communicated with the hot well of the condenser, the hot well condensed water outlet end of the condenser is communicated with the condensed water pump, the circulating water return end of the condenser is communicated with the water feeding end of the cooling tower and the residual heat water inlet end of the heat pump, the water outlet end of the cooling tower is communicated with the water inlet end of the circulating water pump, the water outlet end of the circulating water pump is communicated with the circulating water inlet end of the condenser, the condensate pump, the shaft seal heater, the low-pressure heater and the deaerator are sequentially communicated, the drain end of the heat pump and the drain end of the steam-water heat exchanger are communicated with the hot well of the condenser, the water outlet end of the heat pump is communicated with the water inlet end of the steam-water heat exchanger and the water inlet end of the low-pressure heater, the electric boiler is used for consuming surplus output of the generator, the water outlet end of the electric boiler is communicated with the primary side water inlet end of the water-water heat exchanger and the residual heat water inlet end of the heat pump, the water inlet end of the electric boiler is communicated with the residual heat water return end of the heat pump and the primary side water return end of the water-water heat exchanger, the water inlet end of the heat consumer is communicated with the water outlet end of the steam-water heat exchanger, and the water outlet end of the heat consumer is communicated with the water inlet end of the heat network circulating water pump, and the water outlet end of the secondary side of the water-water heat exchanger is communicated with the water inlet end of the steam-water heat exchanger.
In some embodiments, a switching valve for switching communication with the residual heat water inlet end of the heat pump is arranged between the circulating water return end of the condenser and the water outlet end of the electric boiler.
In some embodiments, electrically operated valves are disposed between the waste heat water return end of the heat pump and the circulating water pump, between the waste heat water inlet end of the heat pump and the circulating water return end of the condenser, between the water outlet end of the heat network circulating water pump and the water inlet end of the heat pump, between the water outlet end of the heat pump and the water inlet end of the steam-water heat exchanger, between the circulating water return end of the condenser and the waste heat water inlet end of the heat pump, between the condensed water outlet end of the shaft seal heater and the water inlet end of the heat pump, between the water outlet end of the heat pump and the condensed water outlet section of the low pressure heater, and between the water outlet end of the electric boiler and the waste heat water inlet end of the heat pump.
Drawings
Fig. 1 is a schematic structural view of a cogeneration unit according to an embodiment of the present invention.
Reference numerals: 1. a high pressure cylinder; 2. an intermediate pressure cylinder; 3. no. 1 low-pressure cylinder; 4. no. 2 low-pressure cylinder; 5. a condenser; 6. a cooling tower; 7. a water circulating pump; 8. a condensate pump; 9. a shaft seal heater; 10. a No. 8 low pressure heater; 11. no. 7 low pressure heater; 12. number 6 low pressure heater; 13. a No. 5 low pressure heater; 14. a deaerator; 15. a steam-water heat exchanger; 16. a hot user; 17. a heat supply network circulating water pump; 18. a heat pump; 19. an electric boiler; 20. a water-water heat exchanger; 21. and (5) changing the plants to high plants.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
According to the utility model discloses electric boiler heat recovery system, electric boiler heat recovery system includes water heat exchanger 20 and heat pump 18, the side of water heat exchanger 20 is intake the end and is communicate with electric boiler 19's play water end, the side of water heat exchanger 20 is intake the end and is communicate with electric boiler 19's the end of intaking, water heat exchanger 20's secondary side is intake the end and is exported the intercommunication with heat supply network circulating water pump 17, water heat exchanger 20's secondary side is returned water end and heat supply network circulating water pump 17 import intercommunication, heat pump 18's waste hot water is intake the end and is communicated with electric boiler 19's play water end, heat pump 18's waste hot water is returned water end and electric boiler 19's the end of intaking and is communicated so that retrieve the heat that electric boiler 19 goes out water, heat pump 18's the end of intaking links to each other with No. 6 low pressure heater 12's end of intaking. The heat pump 18 is an absorption heat pump 18. The water-water heat exchanger 20 and the heat pump 18 can recover the heat over-supplied by the electric boiler 19, reduce the coal consumption for heat supply and reduce the power consumption of a heat supply plant.
According to the utility model discloses electric boiler heat recovery system has the super heat supply volume of retrieving electric boiler, reduces the heat supply coal consumption, reduces the advantage of heat supply plant power consumption.
In some embodiments, the secondary side water return end is communicated with the water inlet end of the steam-water heat exchanger 15, and the water outlet end of the steam-water heat exchanger 15 is communicated with the inlet of the heat consumer 16.
Therefore, the secondary side water return end of the water-water heat exchanger 20 is communicated with the steam-water heat exchanger 15, and the temperature of hot water is increased by using steam to meet the heat supply requirement.
In some embodiments, the driving steam end of the heat pump 18 is communicated with the exhaust end of the medium pressure cylinder 2 of the steam turbine, and the hydrophobic end of the heat pump 18 is communicated with the hot well of the condenser 5.
Specifically, the steam turbine comprises a high-pressure cylinder 1, an intermediate-pressure cylinder 2 and a low-pressure cylinder, main steam at the outlet of a boiler is communicated with a steam inlet of the high-pressure cylinder 1 of the steam turbine, a steam exhaust end of the high-pressure cylinder 1 is communicated with a steam inlet of the intermediate-pressure cylinder 2, a driving steam end of a heat pump 18 is communicated with a steam exhaust end of the intermediate-pressure cylinder 2, a steam inlet of the low-pressure cylinder is communicated with a steam exhaust end of the intermediate-pressure cylinder 2, and a steam exhaust butterfly valve is arranged between the intermediate-pressure cylinder 2 and the low-pressure cylinder.
In some embodiments, the steam inlet end of the steam-water heat exchanger 15 is communicated with the steam exhaust end of the intermediate pressure cylinder 2 of the steam turbine, and the water drainage end of the steam-water heat exchanger 15 is communicated with the hot well of the condenser 5.
Specifically, the steam inlet end of the steam-water heat exchanger 15 is communicated with the steam exhaust end of the intermediate pressure cylinder 2, and the heating steam of the steam-water heat exchanger 15 adopts the steam from the intermediate pressure cylinder 2 to improve the water temperature to meet the heat supply requirement.
In some embodiments, the water outlet end of the low pressure heater is in communication with a deaerator 14.
Specifically, the water outlet end of the No. 5 low-pressure heater 13 is communicated with the deaerator 14, the deaerator 14 can prevent the oxygen content in water from increasing to corrode a pipeline, the service life of the system is prolonged, and water of the deaerator 14 enters the boiler through the water feeding pump after being deaerated and finally enters the steam turbine to do work.
In some embodiments, the circulating water return end of the condenser 5 is communicated with the water supply end of the cooling tower 6, the water outlet end of the cooling tower 6 is communicated with the water inlet end of the circulating water pump 7, the water outlet end of the circulating water pump 7 is communicated with the circulating water inlet end of the condenser 5, the condensed water outlet of the hot well is communicated with the water inlet end of the condensed water pump 8, and the outlet of the condensed water pump 8 is communicated with the water inlet end of the low-pressure heater.
From this, condenser 5 has guaranteed whole thermodynamic cycle's continuous operation, and circulating water pump 7 drive rivers circulate between cooling tower 6 and condenser 5, and condensate pump 8 carries the condensate water of condenser 5's hot-well to low pressure feed water heater, can improve the temperature of water, has reduced the steam volume that the steam turbine arranged to condenser 5 in, has reduced the cold source loss, improves the thermodynamic cycle efficiency of system.
In some embodiments, a gland seal heater 9 is arranged between the low-pressure heater and the condensate pump 8, and a condensate outlet of the gland seal heater 9 is communicated with a water inlet end of the heat pump 18.
Therefore, the shaft seal heater can recover shaft seal leakage steam to reduce cold source loss and improve the thermodynamic cycle efficiency of the system.
According to the cogeneration unit of the embodiment of the utility model, the cogeneration unit comprises a boiler, a steam turbine, a condenser 5, a heat pump 18, an electric boiler 19 and a heat consumer 16, main steam at the outlet of the boiler is communicated with a steam inlet of the steam turbine, steam outlets of a No. 1 low pressure cylinder 3 and a No. 2 low pressure cylinder 4 of the steam turbine are communicated with a steam inlet of the condenser 5, a steam outlet of a medium pressure cylinder 2 of the steam turbine is communicated with a driving steam inlet of the heat pump 18 and a heating steam inlet of a steam-water heat exchanger 15, the steam turbine is used for driving a generator to generate electricity, a drain end of the steam-water heat exchanger 15 and a drain end of the heat pump 18 are communicated with a hot well of the condenser 5, a hot well condensed water outlet end of the condenser 5 is communicated with a condensed water pump 8, a circulating water return end of the condenser 5 is communicated with a water inlet end of a cooling tower 6 and a residual hot water inlet end of the heat pump 18, a water outlet end of the cooling tower 6 is communicated with a water inlet end of a circulating water pump 7, the water outlet end of a circulating water pump 7 is communicated with the circulating water inlet end of a condenser 5, a condensate pump 8, a shaft seal heater 9, a low-pressure heater and a deaerator 14 are sequentially communicated, the water drain end of a heat pump 18 and the water drain end of a steam-water heat exchanger 15 are communicated with a hot well of the condenser 5, the water outlet end of the heat pump 18 is communicated with the water inlet end of the steam-water heat exchanger 15 and the water inlet end of a No. 5 low-pressure heater 12, an electric boiler 19 is used for consuming surplus power of a generator, the water outlet end of the electric boiler 19 is communicated with the primary side water inlet end of a water-water heat exchanger 20 and the water waste water inlet end of the heat pump 18, the water inlet end of the electric boiler 19 is communicated with the water waste water return end of the heat pump 18 and the primary side water return end of the water heat exchanger 20, the water inlet end of a heat consumer 16 is communicated with the water outlet end of the steam-water heat exchanger 15, the water outlet end of the heat consumer 16 is communicated with the water inlet end of a heat network circulating water pump 17, the water outlet end of the heat network circulating water pump 17 is communicated with the water inlet end of the heat pump 18 and the secondary side water inlet end of the water heat exchanger 20, the secondary side water outlet end of the water-water heat exchanger 20 is communicated with the water inlet end of the steam-water heat exchanger 15. The steam turbine includes high pressure cylinder 1, intermediate pressure cylinder 2, No. 1 low-pressure cylinder 3 and No. 2 low-pressure cylinder 4, and the high voltage power supply of electric boiler 19 links to each other with high factory change 21. The high plant transformer 21 is a distribution transformer that provides electrical power to power plant equipment. The low-pressure heaters comprise a No. 5 low-pressure heater 13, a No. 6 low-pressure heater 12, a No. 7 low-pressure heater 11 and a No. 8 low-pressure heater 10, and surplus heat recovered by a heat pump 18 from effluent water of an electric boiler 19 is recovered to an outlet of the No. 7 low-pressure heater 11 (namely an inlet of the No. 6 low-pressure heater 12).
Therefore, when the heat and power cogeneration unit needs deep peak shaving in the early and late stages of heating and heat supply, and when the heat of the outlet water of the water-water heat exchanger 20 of the electric boiler 19 exceeds the heat required by a user, the inlet water of the residual heat water of the heat pump 18 is switched into part of the outlet water of the electric boiler 19 by the circulating backwater of the condenser 5. The surplus heat recovered from the effluent of the electric boiler 19 by the heat pump 18 is recovered to the low-pressure heater, so that the excess heat of the electric boiler 19 under the deep peak shaving heat supply working condition is effectively recovered, the loss of the excess heat of the outlet of the electric boiler 19 without benefit is eliminated, the heat supply coal consumption is reduced, and the power consumption of a heat supply plant is reduced. The quantity of the heat pumps 18 for recovering the excess heat of the water outlet of the electric boiler 19 depends on the amount of the excess heat of the electric boiler 19, and the more the excess heat is, the more the heat pumps 18 for recovering are put into use. Compared with the quality of the circulating water return of the condenser 5 at the beginning and the end of heat supply, the quality of the outlet water of the electric boiler 19 is higher, and the recycling value is higher.
In some embodiments, a switching valve for switching communication with the waste heat water inlet end of the heat pump 18 is arranged between the circulating water return end of the condenser 5 and the water outlet end of the electric boiler 19.
Therefore, the switching valve realizes that the inflow of residual heat water of the heat pump 18 is switched into partial outflow of the electric boiler 19 from the circulating backwater of the condenser 5, so that the excessive heat supply of the outflow of the electric boiler 19 is convenient to recover.
In some embodiments, electric valves are respectively arranged between the condenser 5 and the heat pump 18, between the waste heat water return end of the heat pump 18 and the circulating water pump 7, between the waste heat water inlet end of the heat pump 18 and the circulating water return end of the condenser 5, between the water outlet end of the heat network circulating water pump 17 and the water inlet end of the heat pump 18, between the water outlet end of the heat pump 18 and the water inlet end of the steam-water heat exchanger 15, between the circulating water return end of the condenser 5 and the waste heat water inlet end of the heat pump 18, between the condensed water outlet end of the shaft seal heater 9 and the water inlet end of the heat pump 18, between the water outlet end of the heat pump 18 and the condensed water outlet end of the low pressure heater, and between the water outlet end of the electric boiler 19 and the waste heat water inlet end of the heat pump 18.
The utility model discloses a concrete working process does:
when the cogeneration unit is in the deep peak shaving and heating working condition at the beginning and the end of heating and heat supply, and when the heat required by the heat user 16 is less than the heat generated by the electric boiler 19, 1 or a plurality of heat pumps 18 are sequentially split according to the quantity of the heat exceeding. When the heat pump 18 is disassembled, the electric valve from the circulating water return end of the condenser 5 to the residual heat water inlet end of the heat pump 18, the switching valve, the electric valve from the residual heat water return end of the heat pump 18 to the circulating water inlet end of the condenser 5, the electric valve from the water return end of the heat network circulating water pump 17 to the water inlet end of the heat pump 18, the electric valve from the water outlet end of the heat pump 18 to the water inlet end of the steam-water heat exchanger 15 are closed in sequence, the electric valve from the condensed water outlet end of the shaft seal heater 9 to the water inlet end of the heat pump 18, the electric valve from the water outlet end of the heat pump 18 to the condensed water outlet end of the No. 7 low pressure heater 11, the electric valve from the water outlet end of the electric boiler 19 to the residual heat water inlet end of the heat pump 18, and the electric valve from the residual heat water return end of the heat pump 18 to the water inlet end of the electric boiler 19 are opened in sequence. The method comprises the steps of switching the inflow of residual heat water of a heat pump 18 from the circulating backwater of a condenser 5 to the outflow of an electric boiler 19, switching the outflow of the inflow of the heat pump 18 from a heat supply network circulating water pump 17 to the outflow of condensed water of a shaft seal heater 9, switching the outflow of the residual heat water of the heat pump 18 from the circulating water pump 7 of the condenser 5 to the inflow of the electric boiler 19, and switching the inflow of the outflow of the heat pump 18 from the inflow of a steam-water heat exchanger 15 to the inflow of part of condensed water of a No. 6 low-pressure heater 12. Namely, the heat pump 18 recovers surplus heat from the water discharged from the electric boiler 19 to the inlet of the No. 6 low-pressure heater 12. When the heat required by the heat consumer 16 is greater than the heat produced by the electric boiler 19, the reverse operation is sufficient.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.
Claims (10)
1. An electric boiler heat recovery system, comprising:
the primary side water inlet end of the water-water heat exchanger is communicated with the water outlet end of the electric boiler, the primary side water outlet end of the water-water heat exchanger is communicated with the water inlet end of the electric boiler, the secondary side water inlet end of the water-water heat exchanger is communicated with the outlet of a heat supply network circulating water pump, and the secondary side water return end of the water-water heat exchanger is communicated with the inlet of the heat supply network circulating water pump; and
the waste heat water return end of the heat pump is communicated with the water inlet end of the electric boiler so as to recover the heat of the water discharged from the electric boiler, and the water outlet end of the heat pump is connected with the water inlet end of the low-pressure heater.
2. The electric boiler heat recovery system of claim 1, wherein the secondary side return water end is communicated with a water inlet end of a steam-water heat exchanger, and a water outlet end of the steam-water heat exchanger is communicated with an inlet of the heat supply network circulating water pump.
3. The electric boiler heat recovery system of claim 2, wherein the driving steam end of the heat pump is in communication with the exhaust end of the intermediate pressure cylinder of the steam turbine, and the drain end of the heat pump is in communication with the hot well of the condenser.
4. The electric boiler heat recovery system of claim 3, wherein a steam inlet end of the steam-water heat exchanger is in communication with the steam exhaust end of an intermediate pressure cylinder of the steam turbine, and a drain end of the steam-water heat exchanger is in communication with the hot well of the condenser.
5. The electric boiler heat recovery system of claim 4, wherein the water outlet end of the low pressure heater is in communication with a deaerator.
6. The electric boiler heat recovery system of claim 3, wherein the circulating water return end of the condenser is in communication with the upper water end of the cooling tower, the water outlet end of the cooling tower is in communication with the water inlet end of the circulating water pump, the water outlet end of the circulating water pump is in communication with the circulating water inlet end of the condenser, the condensate outlet of the hot well is in communication with the water inlet end of the condensate pump, and the outlet of the condensate pump is in communication with the water inlet end of the low pressure heater.
7. The electric boiler heat recovery system of claim 6, wherein a gland seal heater is disposed between the low pressure heater and the condensate pump, and a condensate outlet of the gland seal heater is communicated with a water inlet end of the heat pump.
8. A cogeneration unit is characterized by comprising
The main steam at the outlet of the boiler is communicated with a steam inlet of a high-pressure cylinder of a steam turbine, a steam outlet of a medium-pressure cylinder of the steam turbine is communicated with a driving steam inlet of a heat pump and a heating steam inlet of a steam-water heat exchanger, a steam outlet of a low-pressure cylinder of the steam turbine is communicated with a steam inlet of a condenser, and the steam turbine is used for driving a generator to generate electricity;
the water drainage end of the steam-water heat exchanger and the water drainage end of the heat pump are communicated with a hot well of the condenser, the condensed water outlet end of the hot well of the condenser is communicated with a condensed water pump, the circulating water return end of the condenser is communicated with the water feeding end of a cooling tower and the residual heat water inlet end of the heat pump, the water outlet end of the cooling tower is communicated with the water inlet end of a circulating water pump, the water outlet end of the circulating water pump is communicated with the circulating water inlet end of the condenser, and the condensed water pump, a shaft seal heater, a low-pressure heater and a deaerator are sequentially communicated;
the water drainage end of the heat pump and the water drainage end of the steam-water heat exchanger are communicated with a hot well of the condenser, and the water outlet end of the heat pump is communicated with the water inlet end of the steam-water heat exchanger and the water inlet end of the low-pressure heater;
the electric boiler is used for consuming the surplus output of the generator, the water outlet end of the electric boiler is communicated with the primary side water inlet end of the water-water heat exchanger and the waste heat water inlet end of the heat pump, and the water inlet end of the electric boiler is communicated with the waste heat water return end of the heat pump and the primary side water return end of the water-water heat exchanger;
the water inlet end of the heat consumer is communicated with the water outlet end of the steam-water heat exchanger, the water outlet end of the heat consumer is communicated with the water inlet end of the heat network circulating water pump, the water outlet end of the heat network circulating water pump is communicated with the water inlet end of the heat pump and the secondary side water inlet end of the water-water heat exchanger, and the secondary side water outlet end of the water-water heat exchanger is communicated with the water inlet end of the steam-water heat exchanger.
9. The cogeneration unit of claim 8, wherein a switching valve for switching communication with the waste heat water inlet end of the heat pump is provided between the circulating water return end of the condenser and the water outlet end of the electric boiler.
10. The cogeneration unit according to claim 9, wherein electrically operated valves are disposed between the waste heat water return end of the heat pump and the circulating water pump, between the waste heat water inlet end of the heat pump and the circulating water return end of the condenser, between the water outlet end of the heat grid circulating water pump and the water inlet end of the heat pump, between the water outlet end of the heat pump and the water inlet end of the steam-water heat exchanger, between the circulating water return end of the condenser and the waste heat water inlet end of the heat pump, between the condensed water outlet end of the shaft seal heater and the water inlet end of the heat pump, between the water outlet end of the heat pump and the condensed water outlet section of the low pressure heater, and between the water outlet end of the electric boiler and the waste heat water inlet end of the heat pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221236226.8U CN217441606U (en) | 2022-05-20 | 2022-05-20 | Electric boiler heat recovery system and cogeneration unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221236226.8U CN217441606U (en) | 2022-05-20 | 2022-05-20 | Electric boiler heat recovery system and cogeneration unit |
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| CN217441606U true CN217441606U (en) | 2022-09-16 |
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| CN202221236226.8U Active CN217441606U (en) | 2022-05-20 | 2022-05-20 | Electric boiler heat recovery system and cogeneration unit |
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- 2022-05-20 CN CN202221236226.8U patent/CN217441606U/en active Active
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