CN215832223U - Cold and hot combined supply system for exhaust steam waste heat recovery - Google Patents
Cold and hot combined supply system for exhaust steam waste heat recovery Download PDFInfo
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- CN215832223U CN215832223U CN202122098095.3U CN202122098095U CN215832223U CN 215832223 U CN215832223 U CN 215832223U CN 202122098095 U CN202122098095 U CN 202122098095U CN 215832223 U CN215832223 U CN 215832223U
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Abstract
The utility model discloses a cold and hot combined supply system for recovering waste heat of exhaust steam, and belongs to the technical field of waste heat recovery of exhaust steam. The system comprises a fixed-row flash tank, a steam-steam ejector, a refrigerating system, a heating system, a cooling water storage tank, a cold water supply storage tank and a hot water supply storage tank; the steam outlet and the steam extraction port of the steam turbine of the fixed-discharge flash tank are communicated with the inlet of a steam ejector, and two pipelines are led out from the outlet of the steam ejector and are respectively communicated with the inlets of a refrigerating system and a heating system; the cooling water storage tank is used for supplying water for a refrigerating system and a heating system; the outlet of the refrigerating system is respectively connected with a main cooling pipeline and an auxiliary cooling pipeline, and the auxiliary cooling pipeline is connected with a cooling water storage tank; the outlet of the heating system is respectively connected with a main heating pipeline and an auxiliary heating pipeline, and the auxiliary heating pipeline is connected with a heating water storage tank. The system ensures the stability of output cold and heat, and can improve the utilization efficiency of dead steam by extracting steam through the steam turbine according to the actual cold and heat using requirements of users.
Description
Technical Field
The utility model relates to the technical field of exhaust steam waste heat recovery, in particular to a cold and hot combined supply system for exhaust steam waste heat recovery.
Background
In the production process of a thermal power plant, strict standard regulations are provided for the steam quality, and the power plant generally adopts a continuous pollution discharge mode and a periodic pollution discharge mode to ensure the steam quality. The temperature of the exhaust steam generated by the fixed-discharge flash tank is 100-120 ℃, and the low-grade steam is usually directly discharged to the air. Not only causes resource loss of a power plant, but also has negative influence on environmental vision to a certain extent.
Aiming at the problem of low-grade steam recycling, a waste heat recovery system for supplying cold, heat and electricity and a waste heat recycling and refrigerating system based on lithium bromide refrigeration are provided at present. For example, chinese patent CN209523787U discloses a waste heat recovery system, which includes a generator set and a lithium bromide unit, wherein a waste heat source can be introduced into the generator set to generate electricity, and can also be used to cool or heat through the lithium bromide unit to provide a combined supply of cooling, heating and power. Chinese patent CN210980422U discloses a waste heat recycling refrigeration system based on lithium bromide refrigeration, which comprises a transfer tank, a lithium bromide refrigeration unit and an air conditioning refrigeration unit, wherein a secondary transfer tank is used to stably output lithium bromide chilled water, thereby stabilizing the refrigeration capacity of the air conditioning refrigeration unit.
The two types of waste heat recycling systems have at least the following technical problems: 1) a system combining a generator set with a lithium bromide unit can cause unstable capacity of continuous output of electric quantity or refrigeration/heating quantity; 2) the introduction of the transfer tank causes energy loss of the working medium in the process of twice transfer tank access, the waste heat utilization efficiency is not high, and particularly when the cold demand is low (such as in winter), the system has low waste heat recovery efficiency.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a combined cooling and heating system for recovering waste heat of exhaust steam, which is realized by adopting the following technical scheme:
a cold and hot combined supply system for recovering waste steam and waste heat comprises a fixed-row flash tank, a steam-steam ejector, a refrigerating system, a heating system, a cooling water storage tank, a cold water storage tank and a hot water storage tank;
the steam outlet and the steam extraction port of the steam turbine of the fixed-discharge flash tank are communicated with the inlet of a steam ejector, and two pipelines are led out from the outlet of the steam ejector and are respectively communicated with the inlets of a refrigerating system and a heating system; the cooling water storage tank is used for supplying water for a refrigerating system and a heating system;
the outlet of the refrigeration system is respectively connected with a main cooling pipeline and an auxiliary cooling pipeline provided with a first electric valve, the main cooling pipeline directly leads out refrigerated water, the auxiliary cooling pipeline is communicated with the upper inlet of a cooling water storage tank, and the bottom of the cooling water storage tank is provided with an auxiliary cooling water outlet;
the outlet of the heating system is respectively connected with a main heat supply pipeline and an auxiliary heat supply pipeline provided with a second electric valve, the main heat supply pipeline directly leads out water after heating, the auxiliary heat supply pipeline is communicated with the upper inlet of the hot water supply storage tank, and the bottom of the hot water supply storage tank is provided with an auxiliary hot water supply outlet.
Preferably, water level gauges are respectively arranged in the cold water supply storage tank and the hot water supply storage tank.
Preferably, the water level meter is connected with the steam ejector through a feedback circuit and is used for controlling the steam extraction amount of the steam turbine entering the steam ejector.
Preferably, the steam-steam ejector comprises a first channel connected with a steam extraction opening of the steam turbine and a second channel connected with a steam outlet of the fixed-discharge flash tank, the second channel is communicated with the receiving chamber, and a valve for controlling the steam extraction amount of the steam turbine is arranged on the first channel.
Preferably, a first stop valve is arranged on a first pipeline connected with the steam-steam ejector and the refrigerating system, and a second stop valve is arranged on a second pipeline connected with the steam-steam ejector and the heating system.
Preferably, refrigerating system include lithium bromide unit and first exhaust treatment room, the steam inlet of lithium bromide unit and the export intercommunication of vapour ejector, the water inlet and the cooling water storage tank intercommunication of lithium bromide unit, the gas vent and the first exhaust treatment room intercommunication of lithium bromide unit, the main cooling pipeline that supplies is connected to the delivery port of lithium bromide unit.
Preferably, the heating system comprises a steam-water heat exchanger unit and a second exhaust treatment chamber, a steam inlet of the steam-water heat exchanger unit is communicated with an outlet of the steam-steam ejector, a water inlet of the steam-water heat exchanger unit is communicated with the cooling water storage tank, an exhaust port of the steam-water heat exchanger unit is communicated with the second exhaust treatment chamber, and a water outlet of the steam-water heat exchanger unit is connected with the main heat supply pipeline.
Preferably, the main cooling pipeline and the main heating pipeline are provided with electric pumps.
Preferably, the cooling water storage tank is provided with a water inlet pipeline and two water outlet pipelines which are respectively communicated with the refrigerating system and the heating system, and each pipeline is provided with an electric pump.
The utility model has the beneficial effects that: the system has the advantages that the refrigeration capacity is provided by the lithium bromide unit, the heating capacity is provided by the steam-water heat exchange unit, the cooling water storage tank, the cold water supply storage tank and the hot water supply storage tank are reasonably designed on the premise of ensuring the existing waste heat utilization efficiency, the stability of output cold and heat is ensured, the exhaust steam utilization efficiency can be improved by extracting steam through the steam turbine according to the actual cold and heat requirements of users, and the cold and heat combined supply mode is optimized.
Drawings
Fig. 1 is a schematic structural diagram of a waste steam heat recovery combined cooling and heating system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a refrigeration system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a heating system according to an embodiment of the present invention.
In the figure: 1-a fixed-row flash tank; 2-a steam ejector, 21-a steam extraction port, 22-a first stop valve and 23-a second stop valve; 3-a refrigeration system, 31-a lithium bromide unit, 32-a first exhaust treatment chamber, 33-a first electric pump, 34-a first electric valve and 35-a main cooling pipeline; 4-a heating system, 41-a steam-water heat exchange unit, 42-a second exhaust treatment chamber, 43-a second electric pump, 44-a second electric valve and 45-a main heat supply pipeline; 5-a cooling water storage tank, 51-a cooling water inlet, 52-a third electric pump, 53-a fourth electric pump, 54-a fifth electric pump; 6-cold water supply storage tank, 61-auxiliary cold water supply outlet; 7-a hot water supply storage tank, 71-an auxiliary hot water supply outlet; 8-feedback circuit.
Detailed Description
The utility model will now be further described with reference to the accompanying drawings, which illustrate, in a simplified schematic manner, the basic operating principles of the utility model.
As shown in fig. 1, the combined cooling and heating system for recovering waste heat of exhaust steam provided by the utility model comprises a fixed-row flash tank 1, a steam-steam ejector 2, a refrigerating system 3, a heating system 4, a cooling water storage tank 5, a cold water storage tank 6 and a hot water storage tank 7; the reasonable design of the cooling water storage tank 5, the cold water supply storage tank 6 and the hot water supply storage tank 7 ensures the stability of the cold and heat output of the combined cold and heat supply system.
The fixed-discharge flash tank is used as the steam production equipment of the utility model, and the traditional fixed-discharge flash tank separates secondary steam and waste hot water from regular sewage or waste hot water discharged by a boiler through pressure reduction and flash expansion. The secondary steam is used as a heat source for preheating and recycling. A steam outlet of the fixed-discharge flash tank 1 and a steam extraction port 21 of a steam turbine are communicated with an inlet of a steam ejector 2, and two pipelines led out from an outlet of the steam ejector 2 are respectively communicated with inlets of a refrigerating system 3 and a heating system 4; cooling water storage tank 5 be used for supplying water for refrigerating system 3 and heating system 4, cooling water storage tank 5 on be equipped with an inlet channel and two outlet conduit that communicate refrigerating system 3 and heating system 4 respectively, all install the electric pump on each pipeline, wherein third electric pump 52 is used for getting into cooling water storage tank 5 for the cooling water and provides drive power, fourth electric pump 53 is used for getting into refrigerating system 3 for the cooling water and provides drive power, fifth electric pump 54 is used for getting into heating system 4 for the cooling water and provides drive power.
The outlet of the refrigerating system 3 is respectively connected with a main cooling pipeline 35 and an auxiliary cooling pipeline provided with a first electric valve 34, the main cooling pipeline 35 directly leads out refrigerated water, the auxiliary cooling pipeline is communicated with the upper inlet of the cooling water storage tank 6, and the bottom of the cooling water storage tank 6 is provided with an auxiliary cooling water outlet 61;
the outlet of the heating system 4 is respectively connected with a main heating pipeline 45 and an auxiliary heating pipeline provided with a second electric valve 44, the main heating pipeline 45 is directly led out water after heating, the auxiliary heating pipeline is communicated with the upper inlet of the hot water supply storage tank 7, and the bottom of the hot water supply storage tank 7 is provided with an auxiliary hot water supply outlet 71.
In order to realize the self-adaptive adjustment of the cold/heat supply amount of the combined cold and heat supply system, water level meters are respectively arranged in a cold water supply storage tank 6 and a hot water supply storage tank 7 and are connected with the steam ejector 2 through a feedback circuit 8 to control the steam extraction amount of a steam turbine entering the steam ejector 2. In concrete realization, steam vapour ejector 2 include a first passageway of being connected with steam turbine extraction opening and a second passageway that is connected with the flash tank 1 steam outlet of surely arranging, second passageway intercommunication receiving chamber, be equipped with the valve of control steam turbine extraction volume on the first passageway, steam turbine extraction gets into steam vapour ejector 2 through first passageway, the steam that surely arranges flash tank 1 production gets into the receiving chamber of steam vapour ejector 2 through the second passageway, draws to penetrate at steam turbine extraction and rise the pressure with steam temperature, satisfies refrigerating system and heating system's operation requirement. The reading of the water level meter is converted into an electric signal through a feedback circuit, the opening of a valve on the first channel is controlled, and the steam extraction quantity of the steam turbine is adjusted.
A first stop valve 22 is arranged on a first pipeline connecting the steam-steam ejector 2 and the refrigerating system 3, and a second stop valve 23 is arranged on a second pipeline connecting the steam-steam ejector 2 and the heating system 4. The first stop valve 22 and the second stop valve 23 are used to start and stop the cooling system and the heating system, respectively.
In one embodiment of the present invention, as shown in fig. 2, the refrigeration system utilizes a lithium bromide unit for refrigeration, and includes a lithium bromide unit 31 and a first exhaust treatment chamber 32, a steam inlet of the lithium bromide unit is communicated with an outlet of the steam ejector 2, a water inlet of the lithium bromide unit is communicated with the cooling water storage tank 5, an exhaust port of the lithium bromide unit is communicated with the first exhaust treatment chamber 32, and a water outlet of the lithium bromide unit is connected to a main cooling supply pipeline 35.
In one specific implementation of the present invention, as shown in fig. 3, the heating system generates heat by using a steam-water heat exchanger unit, and includes a steam-water heat exchanger unit 41 and a second exhaust treatment chamber 42, a steam inlet of the steam-water heat exchanger unit 41 is communicated with an outlet of the steam-steam ejector 2, a water inlet of the steam-water heat exchanger unit is communicated with the cooling water storage tank 5, an exhaust port of the steam-water heat exchanger unit is communicated with the second exhaust treatment chamber 42, and a water outlet of the steam-water heat exchanger unit is connected to a main heat supply pipeline 45.
And the main cold supply pipeline and the main heat supply pipeline are provided with electric pumps which are respectively used for driving cold media and hot media to flow. The first electric pump 33 is used for driving the cooled water to be discharged from the cooling system, and the second electric pump 34 is used for driving the heated water to be discharged from the heating system.
The working process of the cold and hot combined supply system for recovering the waste steam waste heat is as follows:
firstly, the system is initialized, the fixed-displacement flash tank produces steam, and cooling water is pumped into the cooling water storage tank 5 from the cooling water inlet 51 by the third electric pump.
Second, the first stop valve 22 is opened to start the refrigeration system 3. The extracted steam of the steam turbine is used for ejecting the steam in the fixed-discharge flash tank 1 through the steam ejector 2, and the ejected mixed steam is heated and pressurized to meet the operation requirement of the lithium bromide unit 31. The mixed steam enters the steam inlet of the lithium bromide unit, and simultaneously, the cooling water stored in the cooling water storage tank 5 enters the water inlet of the lithium bromide unit through the driving of the fourth electric pump 53. The mixed steam drives a lithium bromide unit 31 to circularly cool the temperature-reduced volume-expansion drainage or circulating cooling water from 25-30 ℃ to 5-7 ℃, the water is pumped into a main cooling pipeline 35 under the drive of a first electric pump 33, and the waste gas is treated by a first exhaust treatment chamber 32 in the refrigeration system and then is exhausted.
When the demand of cooling is small, the opening degree of the first electric valve 34 is increased, redundant cold water is stored in the cold water supply storage tank 6, meanwhile, the residual quantity of the cold water supply storage tank 6 is detected by the water level meter and then converted into an electric signal, the electric signal is fed back to the steam ejector 2 through the feedback circuit 8, and the steam extraction quantity of the steam turbine is decreased. When the demand for cooling is large, the cold water stored in the cold water supply storage tank 6 is discharged from the auxiliary cold water supply outlet 61 to provide auxiliary cooling, so that stable supply of cooling capacity for users is guaranteed, meanwhile, the residual quantity of the cold water supply storage tank 6 is detected by the water level meter and then converted into an electric signal, and the electric signal is fed back to the steam ejector 2 through the feedback circuit 8 to increase the steam extraction quantity of the steam turbine.
And thirdly, opening the second stop valve 23 and starting the heating system 4. The extracted steam of the steam turbine is used for ejecting the steam in the fixed-discharge flash tank 1 through the steam ejector 2, and the ejected mixed steam is heated and boosted to meet the operation requirement of the steam-water heat exchange unit 41. The mixed steam enters a steam inlet of the steam-water heat exchanger unit, and meanwhile, the cooling water stored in the cooling water storage tank 5 enters a water inlet of the steam-water heat exchanger unit through the driving of the fifth electric pump 54. The steam heat is transferred to the cooling water in the steam-water heat exchanger unit 41 to generate hot water, the hot water is pumped into the main heat supply pipeline 45 under the driving of the second electric pump 43, and the waste gas is treated by the second exhaust treatment chamber 42 in the heating system and then is exhausted.
When the heat demand is smaller, the opening degree of the second electric valve 44 is increased, the excess heat water is stored in the hot water supply storage tank 7, meanwhile, the residual amount of the hot water supply storage tank 7 is detected by the water level meter and then converted into an electric signal, the electric signal is fed back to the steam ejector 2 through the feedback circuit 8, and the steam extraction amount of the steam turbine is reduced. When the heat demand is large, the hot water stored in the hot water supply storage tank 7 is discharged from the auxiliary hot water supply outlet 71 to provide auxiliary heat supply, so that the stable supply of the heat used by a user is ensured, meanwhile, the residual quantity of the hot water supply storage tank 7 is detected by a water level meter and then converted into an electric signal, and the electric signal is fed back to the steam ejector 2 through the feedback circuit 8 to increase the steam extraction quantity of the steam turbine.
The foregoing lists merely illustrate specific embodiments of the utility model. It is obvious that the utility model is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the utility model.
Claims (9)
1. A cold and hot combined supply system for recovering waste heat of dead steam is characterized by comprising a fixed-row flash tank (1), a steam ejector (2), a refrigerating system (3), a heating system (4), a cooling water storage tank (5), a cold water supply storage tank (6) and a hot water supply storage tank (7);
a steam outlet and a steam turbine steam extraction port of the fixed-discharge flash tank (1) are communicated with an inlet of a steam ejector (2), and two pipelines led out from an outlet of the steam ejector (2) are respectively communicated with inlets of a refrigerating system (3) and a heating system (4); the cooling water storage tank (5) is used for supplying water for the refrigerating system (3) and the heating system (4);
an outlet of the refrigerating system (3) is respectively connected with a main cooling pipeline (35) and an auxiliary cooling pipeline provided with a first electric valve (34), the main cooling pipeline directly leads out refrigerated water, the auxiliary cooling pipeline is communicated with an upper inlet of a cold water supply storage tank (6), and an auxiliary cold water supply outlet (61) is arranged at the bottom of the cold water supply storage tank (6);
the outlet of the heating system (4) is respectively connected with a main heat supply pipeline (45) and an auxiliary heat supply pipeline provided with a second electric valve (44), the main heat supply pipeline directly leads out water after heating, the auxiliary heat supply pipeline is communicated with the upper inlet of the hot water supply storage tank (7), and an auxiliary hot water supply outlet (71) is arranged at the bottom of the hot water supply storage tank (7).
2. A combined cooling and heating system for recovering waste heat of dead steam according to claim 1, wherein water level gauges are respectively arranged in the cold water supply storage tank (6) and the hot water supply storage tank (7).
3. The waste steam waste heat recovery combined cooling and heating system as claimed in claim 2, wherein the water level gauge is connected with the steam ejector (2) through a feedback circuit (8) and is used for controlling the steam extraction amount of the steam turbine entering the steam ejector (2).
4. The waste steam waste heat recovery combined cooling and heating system as claimed in claim 1, wherein the steam ejector (2) comprises a first channel connected with a steam extraction port (21) of the steam turbine and a second channel connected with a steam outlet of the fixed discharge flash tank (1), the second channel is communicated with the receiving chamber, and a valve for controlling the steam extraction amount of the steam turbine is arranged on the first channel.
5. The waste steam waste heat recovery combined cooling and heating system as claimed in claim 1, wherein a first stop valve (22) is arranged on a first pipeline connecting the steam ejector (2) and the refrigeration system (3), and a second stop valve (23) is arranged on a second pipeline connecting the steam ejector (2) and the heating system (4).
6. The exhaust steam waste heat recovery combined cooling and heating system according to claim 1, wherein the refrigerating system (3) comprises a lithium bromide unit (31) and a first exhaust treatment chamber (32), a steam inlet of the lithium bromide unit is communicated with an outlet of the steam ejector (2), a water inlet of the lithium bromide unit is communicated with the cooling water storage tank (5), an exhaust port of the lithium bromide unit is communicated with the first exhaust treatment chamber, and a water outlet of the lithium bromide unit is connected with a main cooling supply pipeline (35).
7. The exhaust steam waste heat recovery combined cooling and heating system according to claim 1, wherein the heating system comprises a steam-water heat exchanger unit (41) and a second exhaust treatment chamber (42), a steam inlet of the steam-water heat exchanger unit is communicated with an outlet of the steam-steam ejector (2), a water inlet of the steam-water heat exchanger unit is communicated with a cooling water storage tank (5), an exhaust port of the steam-water heat exchanger unit is communicated with the second exhaust treatment chamber, and a water outlet of the steam-water heat exchanger unit is connected with a main heat supply pipeline (45).
8. A combined cooling and heating system for recovering waste heat from exhaust steam according to claim 6 or 7, wherein electric pumps are installed on the main cooling pipeline and the main heating pipeline.
9. A combined cooling and heating system for recovering waste heat from exhaust steam according to claim 1, wherein the cooling water storage tank (5) is provided with a water inlet pipeline and two water outlet pipelines respectively communicating the refrigerating system and the heating system, and each pipeline is provided with an electric pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122098095.3U CN215832223U (en) | 2021-09-01 | 2021-09-01 | Cold and hot combined supply system for exhaust steam waste heat recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122098095.3U CN215832223U (en) | 2021-09-01 | 2021-09-01 | Cold and hot combined supply system for exhaust steam waste heat recovery |
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| Publication Number | Publication Date |
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| CN215832223U true CN215832223U (en) | 2022-02-15 |
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| CN202122098095.3U Active CN215832223U (en) | 2021-09-01 | 2021-09-01 | Cold and hot combined supply system for exhaust steam waste heat recovery |
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2021
- 2021-09-01 CN CN202122098095.3U patent/CN215832223U/en active Active
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