CN210292036U - High-efficient low vacuum waste heat recovery system - Google Patents
High-efficient low vacuum waste heat recovery system Download PDFInfo
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- CN210292036U CN210292036U CN201920941333.2U CN201920941333U CN210292036U CN 210292036 U CN210292036 U CN 210292036U CN 201920941333 U CN201920941333 U CN 201920941333U CN 210292036 U CN210292036 U CN 210292036U
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Abstract
A high-efficiency low-vacuum waste heat recovery system comprises an absorption heat pump system; the absorption heat pump system comprises a generator, a condenser, an evaporator and an absorber, wherein a working medium output pipeline of the generator is connected with a working medium input pipeline of the condenser; the absorption heat pump system exchanges heat through various media. The utility model discloses an utilize absorption heat pump to reduce heat supply network temperature return water temperature, make it satisfy condenser recirculated cooling water's condition, the exhaust steam waste heat of retrieving steam turbine exhaust is used for the heating, has both reduced the waste heat waste, has improved the heating capacity of unit again.
Description
Technical Field
The utility model relates to a low-grade waste heat recovery of thermal power plant field specifically is a high-efficient low vacuum waste heat recovery system, is a neotype waste heat recovery system.
Background
In a conventional thermal power plant, heat taken away by low-temperature circulating cooling water of a condenser accounts for more than 30% of total energy consumption of the whole plant, a large amount of energy waste and thermal pollution are caused, and the significance of waste heat utilization is great.
The central heating is a trend of future urban development under the environmental pressure, and the heat supply transformation of the thermal power generating unit is a main technical means for improving the heat supply capacity. At present, a thermal power generating unit mainly adopts a steam extraction and heat supply technology, and has higher requirements on parameters such as steam source temperature, pressure and the like. However, as the heat load increases year by year, the heating capacity of many units reaches the upper limit, and new technologies are urgently needed to increase the heating capacity of the units. How to utilize low-grade waste heat to improve the heat supply capacity of the unit becomes a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
Technical problem to be solved
The invention provides a high-efficiency low-vacuum waste heat recovery system for recovering low-grade waste heat of circulating cooling water of a condenser, increasing the heat supply capacity of a unit and effectively reducing the coal consumption of the unit.
(II) technical scheme
A high-efficiency low-vacuum waste heat recovery system comprises an absorption heat pump system; the absorption heat pump system comprises a generator, a condenser, an evaporator and an absorber, wherein a working medium output pipeline of the generator is connected with a working medium input pipeline of the condenser;
after the first medium works through the generator, a second medium is discharged out of the generator;
the third medium absorbs heat through the absorber and then enters the condenser to absorb heat, and a fourth medium is formed after heat absorption;
after the fifth medium is cooled by the evaporator, a sixth medium is formed and enters the condenser to absorb heat, and a seventh medium entering the heat supply network water pump inlet main pipe is formed after heat absorption; or the fifth medium is cooled by an evaporator and then directly enters a seventh medium of a heat supply network water pump inlet main pipe;
the eighth medium absorbs heat after passing through the condenser, and a ninth medium is formed after heat absorption and is discharged;
the seventh medium is heated by a heat supply network heater of the heat supply network heating system to form a tenth medium to be discharged; or the seventh medium is discharged directly as the tenth medium.
The absorption heat pump system further comprises a solution heat exchanger, and the solution heat exchanger is connected between the generator and the absorber.
The first medium is steam extracted by the steam turbine intermediate pressure cylinder, and the second medium formed after the steam extracted by the steam turbine intermediate pressure cylinder works by the generator is condensed water which returns to the steam turbine system again.
The third medium is condensed water, the condensed water is sucked by the absorber and then enters the condenser to absorb heat, and a fourth medium formed after heat absorption enters the shaft seal heater or the low-pressure heater inlet condensed water pipeline;
or
The third medium is secondary heat supply network backwater, the backwater is sucked by the absorber and then enters the condenser to absorb heat, and the fourth medium formed after heat absorption enters a secondary heat supply network water supply pipeline.
The fifth medium is return water of a heat supply network;
the eighth medium is circulating water cooling water, and the eighth medium absorbs heat in the condenser to form a ninth medium which enters the cooling tower.
A seventh medium of the heat supply network water pump inlet main pipe is heated by a heat supply network heater of the heat supply network heating system to form a tenth medium which is discharged to a heat supply network water supply pipeline; or the seventh medium is directly discharged to a water supply pipeline of the heat supply network through an eighteenth valve.
And an electric water filtering pump and a heat supply network circulating pump are connected on a pipeline between the seventh medium and the heat supply network heater.
And a fourteenth valve is connected in parallel to the pipeline where the electric water filtering pump is arranged.
A first valve is arranged on a pipeline between the condenser and the evaporator, and the first valve is a pressure reducing valve.
And after the fifth medium is cooled by the evaporator, a fourth valve is connected to a pipeline between the fifth medium and the heat supply network water pump inlet main pipe.
(III) advantageous effects
According to the above technical scheme, the utility model discloses a high-efficient low vacuum waste heat recovery system has following beneficial effect:
(1) the temperature of the return water of a heat supply network is reduced by using an absorption heat pump, so that the temperature meets the condition of circulating cooling water of a condenser, and the exhaust steam waste heat of the steam turbine is recovered for heating, thereby reducing waste heat and improving the heat supply capacity of a unit;
(2) after the return water temperature of the heat supply network is properly reduced through the heat pump, the back pressure corresponding to the original main machine condenser only needs to be properly improved on the premise of safe operation of the existing wet cooling unit, and the exhaust steam heat of the steam turbine is recovered, so that the main steam turbine is prevented from being reformed, and the initial investment of the project is reduced;
(3) the absorption heat pump unit takes steam exhausted by a steam turbine intermediate pressure cylinder as a driving heat source, recovers heat of return water of a heat supply network, is used for heating condensate after fine treatment, can directly improve the temperature of the condensate, reduces steam extraction of the steam turbine, and increases the working capacity of a main steam turbine.
Drawings
Fig. 1 is a schematic diagram of the present invention.
1-a generator; 2-a condenser; 3-an evaporator; 4-an absorber; 5-solution heat exchanger; 6-a condenser; 7-heating network heater
S1, S2, S3, S4, S5, S6, S7, S8, S9, S10-steam or water
P1-solution pump, P2-heat net circulating pump
G1-electric water filter
V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21-valves.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a high-efficient low vacuum waste heat recovery system, including absorption heat pump system, condenser 6 and heat supply network heating system.
The absorption heat pump system comprises a generator 1, a condenser 2, an evaporator 3, an absorber 4 and a working medium circulating among the generator 1, wherein a working medium output pipeline of the generator 1 is connected with a working medium input pipeline of the condenser 2, a working medium output pipeline of the condenser 2 is connected with a working medium input pipeline of the evaporator 3, a working medium output pipeline of the evaporator 3 is connected with a working medium input pipeline of the absorber 4, and a working medium output pipeline of the absorber 4 is connected with a working medium input pipeline of the generator 1.
A solution heat exchanger 5 is arranged on a pipeline between the generator 1 and the absorber 4, two pipelines are arranged between the solution heat exchanger 5 and the absorber 4, one pipeline is provided with a solution valve V2, and the other pipeline is provided with a solution heat exchange pump 5.
As an embodiment, when working media circulating among a generator 1, a condenser 2, an evaporator 3 and an absorber 4 select lithium bromide and aqueous solution as working media pairs, after the lithium bromide-aqueous solution is heated by a high-temperature heat source (such as medium pressure cylinder exhaust) in the generator 1, precipitated refrigerant water vapor enters the condenser 2 to be condensed and releases heat, the condensed water enters the evaporator 3 through a first valve V1-pressure reducing valve, after the evaporator 3 is heated by a low-temperature heat source (such as heat supply network return water), the precipitated low-pressure refrigerant water vapor is absorbed by concentrated lithium bromide solution in the absorber 4 to release heat, dilute lithium bromide solution is generated, then the dilute lithium bromide solution exchanges heat with low-temperature medium dilute lithium bromide solution from the absorber through a solution heat exchanger, the dilute lithium bromide solution is preheated by high-temperature concentrated lithium bromide solution from the generator 1 and then is pumped back to the generator 1 again, the cycle is completed.
In absorption heat pump system, heat or the heat absorption to multiple medium, and then carry out waste heat recovery, wherein:
after the first medium S1 works through the generator 1, a second medium S2 is formed and discharged out of the generator 1; the first medium S1 can be selected from a steam turbine intermediate pressure cylinder to extract steam, the steam turbine intermediate pressure extracted steam is used as a generator driving heat source to drive the generator to work, and the second medium S2 formed after the steam turbine intermediate pressure cylinder extracted steam works through the generator 1 is condensed water which returns to the steam turbine system again.
The third medium S3 absorbs heat through the absorber 4 and then enters the condenser 2 to absorb heat, and the fourth medium S4 is formed after heat absorption. The third medium is a different medium depending on the scenario and the need.
When the third medium S3 is the condensate water after the fine processing, the condensate water is sucked by the absorber 4 and then enters the condenser 2 to absorb heat, and the fourth medium S4 formed after the heat absorption enters the shaft seal heater or the low-pressure heater inlet condensate water pipeline.
When the third medium S3 is the secondary heat supply network backwater, the third medium is sucked by the absorber 4 and then enters the condenser 2 to absorb heat, and the fourth medium S4 formed after heat absorption enters a secondary heat supply network water supply pipeline.
After the fifth medium S5 is cooled by the evaporator 3, a sixth medium S6 is formed and enters the condenser 6 to absorb heat, and a seventh medium S7 is formed and enters the inlet main pipe of the heat supply network water pump after absorbing heat; or the fifth medium S5 is cooled by the evaporator 3 and then directly used as the seventh medium S7 entering the inlet main pipe of the heat supply network water pump.
The fifth medium S5 can be heat supply network backwater, and the sixth medium S6, which is the heat supply network backwater after heat absorption and temperature reduction by the condenser 6 under the normal production condition, enters the heat supply network water pump inlet main pipe to become a seventh medium S7. After the fifth medium S5 serving as return water of the heat supply network is cooled by the evaporator 3 after an accident occurs, the fifth medium directly enters the inlet main pipe of the heat supply network water pump through a bypass.
The eighth medium S8 absorbs heat after passing through the condenser 6, and a ninth medium S9 is formed after absorbing heat and is discharged; the eighth medium S8 is circulating water cooling water, and the eighth medium S8 absorbs heat in the condenser 6 to form a ninth medium S9, and enters the cooling tower.
The condenser 6 is connected with an eighth medium S8 serving as circulating cooling water and a heat supply network backwater-sixth medium S6 cooled by an absorption heat pump system, the eighth medium S8 absorbs the waste steam waste heat of the steam turbine, the heat-absorbed circulating cooling water serves as a ninth medium S9 and is supplied to the cooling tower, and in the process, the heat supply network backwater-sixth medium S6 which absorbs heat is supplied to a heat supply network water pump inlet main pipe of the heat supply network heating system and enters the heat supply network heating system as a seventh medium S7.
The heat supply network heating system comprises an electric water filter G1, a heat supply network circulating water pump P2, a heat supply network heater 7 and relevant matched valves thereof, receives heat supply network return water-seventh medium S7 from a condenser and an absorption heat pump system, heats the heat supply network return water-seventh medium S10, and supplies heat supply network water-tenth medium S10 which reaches the temperature required by a user to a heat supply network water supply main pipe.
The heat supply network heater 7 is provided with a bypass pipeline, an eighteenth valve V18 is arranged on the bypass pipeline, and the return water of the heat supply network directly enters the main pipe when the heat supply network heater 7 fails.
A fourteenth valve V14 is connected in parallel to a pipeline where the electric water filtering pump G1 is located to serve as a standby valve, so that return water of a heat supply network can be directly output when the electric water filtering pump G1 fails.
After the fifth medium S5 is cooled by the evaporator 3, a fourth valve V4 is connected to a pipeline between the fifth medium S5 and a main pipe at the inlet of the heat supply network water pump, and a third valve V3 is arranged on a service pipeline between the sixth medium S6 and the condenser 6.
Overall, electrically operated valves V5~ V11 are used for controlling and adjusting the quantity of recirculated cooling water and the heat supply network return water that get into the condenser, and valves V12~ V21 are heat supply network heating system bypass electrically operated valves, are convenient for equipment operation and put into operation.
Above-mentioned utility model when using, the heat supply network return water-fifth medium S5 at first reduces the temperature to about 40 ℃ through heat pump set, then absorbs the exhaust steam waste heat of steam turbine exhaust through condenser 6, sends to the heat consumer after heating the temperature to the required temperature of user through heat supply network heater 7 at last, and the heat that the heat supply network return water reduces takes away the heat through host computer condensate system or secondary heat supply network water system.
The heat recovered by the heat pump unit is the heat of the return water of the heat supply network-the fifth medium S5, and when the cooling water adopts the condensed water, the temperature of the condensed water can be directly increased, the extracted steam with higher quality is reduced, the condensed water is heated, and the work capacity of the main turbine is increased.
In the heating season, the absorption heat pump system and the heat supply network heating system are put into operation, and the flow rates of circulating cooling water entering the condenser and return water of the heat supply network can be adjusted through the electric valve; in non-heating seasons, the heat supply network heating system equipment is shut down, the absorption heat pump system can absorb the exhaust steam waste heat in the condenser taken away by the circulating water, and then the heat is used for heating the condensed water, so that the coal consumption of the unit is reduced.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the present invention should be covered by the present invention.
Claims (10)
1. A high-efficiency low-vacuum waste heat recovery system is characterized by comprising an absorption heat pump system;
the absorption heat pump system comprises a generator (1), a condenser (2), an evaporator (3) and an absorber (4), wherein a working medium output pipeline of the generator (1) is connected with a working medium input pipeline of the condenser (2), a working medium output pipeline of the condenser (2) is connected with a working medium input pipeline of the evaporator (3), a working medium output pipeline of the evaporator (3) is connected with a working medium input pipeline of the absorber (4), and a working medium output pipeline of the absorber (4) is connected with a working medium input pipeline of the generator (1);
after the first medium (S1) works through the generator (1), a second medium (S2) is formed and discharged out of the generator (1); the third medium (S3) absorbs heat through the absorber (4) and then enters the condenser (2) to absorb heat, and a fourth medium (S4) is formed after heat absorption;
after the fifth medium (S5) is cooled by the evaporator (3), a sixth medium (S6) is formed and enters the condenser (6) to absorb heat, and a seventh medium (S7) entering the inlet main pipe of the heat supply network water pump is formed after heat absorption; or the fifth medium (S5) is cooled by the evaporator (3) and then directly enters a seventh medium (S7) of the heat supply network water pump inlet main pipe;
the eighth medium (S8) absorbs heat after passing through the condenser (6) and forms a ninth medium (S9) to be discharged;
the seventh medium (S7) is heated by a heat supply network heater (7) of the heat supply network heating system to form a tenth medium (S10) to be discharged; or the seventh medium (S7) is discharged directly as the tenth medium (S10).
2. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
the absorption heat pump system further comprises a solution heat exchanger (5), and the solution heat exchanger (5) is connected between the generator (1) and the absorber (4).
3. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
the first medium (S1) is extracted steam of a steam turbine intermediate pressure cylinder, and a second medium (S2) formed after the extracted steam of the steam turbine intermediate pressure cylinder applies work through the generator (1) is condensed water which returns to the steam turbine system again.
4. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
the third medium (S3) is condensed water, the condensed water is sucked by the absorber (4) and then enters the condenser (2) to absorb heat, and a fourth medium (S4) formed after heat absorption enters an inlet condensed water pipeline of the shaft seal heater or the low-pressure heater;
or
The third medium (S3) is secondary heat supply network backwater, the third medium is sucked by the absorber (4) and then enters the condenser (2) to absorb heat, and the fourth medium (S4) formed after heat absorption enters a secondary heat supply network water supply pipeline.
5. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
the fifth medium (S5) is return water of a heat supply network;
the eighth medium (S8) is circulating water cooling water, and the eighth medium (S8) absorbs heat in the condenser (6) to form a ninth medium (S9) and enters the cooling tower.
6. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
a seventh medium (S7) of the heat supply network water pump inlet main pipe is heated by a heat supply network heater (7) of the heat supply network heating system to form a tenth medium (S10) and is discharged to a heat supply network water supply pipeline; or the seventh medium (S7) is directly discharged to the water supply pipeline of the heat supply network through the eighteenth valve (V18).
7. The high efficiency low vacuum waste heat recovery system of claim 6, wherein:
an electric water filtering pump (G1) and a heat supply network circulating pump (P2) are connected to a pipeline between the seventh medium (S7) and the heat supply network heater (7).
8. A high efficiency low vacuum waste heat recovery system according to claim 7 wherein:
and a fourteenth valve (V14) is connected in parallel to a pipeline where the electric water filtering pump (G1) is located.
9. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
a first valve (V1) is arranged on a pipeline between the condenser (2) and the evaporator (3), and the first valve (V1) is a pressure reducing valve.
10. The high efficiency low vacuum waste heat recovery system of claim 1, wherein:
and after the fifth medium (S5) is cooled through the evaporator (3), a fourth valve (V4) is connected to a pipeline between the fifth medium and a main pipe at the inlet of the heat supply network water pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920941333.2U CN210292036U (en) | 2019-06-21 | 2019-06-21 | High-efficient low vacuum waste heat recovery system |
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| CN201920941333.2U CN210292036U (en) | 2019-06-21 | 2019-06-21 | High-efficient low vacuum waste heat recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594288A (en) * | 2020-06-08 | 2020-08-28 | 威立雅（哈尔滨）热电有限公司 | Heat energy recovery device for steam turbine shaft seal heater |
| CN114427762A (en) * | 2022-03-11 | 2022-05-03 | 西安热工研究院有限公司 | System and method for utilizing return water waste heat of heat supply network by adopting absorption heat pump |
-
2019
- 2019-06-21 CN CN201920941333.2U patent/CN210292036U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594288A (en) * | 2020-06-08 | 2020-08-28 | 威立雅（哈尔滨）热电有限公司 | Heat energy recovery device for steam turbine shaft seal heater |
| CN114427762A (en) * | 2022-03-11 | 2022-05-03 | 西安热工研究院有限公司 | System and method for utilizing return water waste heat of heat supply network by adopting absorption heat pump |
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