CN214836580U - Gas-steam combined cycle flue gas waste heat recovery device - Google Patents
Gas-steam combined cycle flue gas waste heat recovery device Download PDFInfo
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- CN214836580U CN214836580U CN202120239639.0U CN202120239639U CN214836580U CN 214836580 U CN214836580 U CN 214836580U CN 202120239639 U CN202120239639 U CN 202120239639U CN 214836580 U CN214836580 U CN 214836580U
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- natural gas
- heater
- immersion
- waste heat
- water
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- 239000002918 waste heat Substances 0.000 title claims abstract description 44
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000003546 flue gas Substances 0.000 title claims abstract description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 258
- 239000003345 natural gas Substances 0.000 claims abstract description 129
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000007654 immersion Methods 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 230000008676 import Effects 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 230000003020 moisturizing effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model discloses a gas-steam combined cycle flue gas waste heat recovery device, it includes the female pipe of condensate water, congeals water heater, oxygen-eliminating device, demineralized water tank and immersion natural gas heater, immersion natural gas heater's air inlet is connected with natural gas import hand-operated gate, immersion natural gas heater's gas outlet is connected with natural gas export hand-operated gate, and the parallel connection has natural gas temperature regulating valve between the two, the export of demineralized water tank links to each other with waste heat recovery heat exchanger's import through the second along separate routes, waste heat recovery heat exchanger's export links to each other with immersion natural gas heater's water inlet, immersion natural gas heater's delivery port links to each other with the import of the female pipe of condensate water, the export of the female pipe of condensate water links to each other with the import of congealing water heater, and congeals the water heater export and links to each other with the oxygen-eliminating device. The utility model discloses utilize immersion natural gas heater to replace original electric heater to the natural gas heating to reduce the station service power rate, improve the heating security.
Description
Technical Field
The utility model relates to a flue gas waste heat recovery technical field, concretely relates to gas-steam combined cycle flue gas waste heat recovery device.
Background
With the development of Chinese economy and the improvement of the living standard of people, the national and public pay more attention to environmental protection, and the requirements on the smoke emission standard of a boiler in a generator set are higher and higher. Therefore, the power generation technology of the gas turbine in China has been developed dramatically in more than ten years, and the gas-steam combined cycle unit gradually becomes an important development direction of the power industry with the advantages of high efficiency, low emission, flexible operation characteristics and the like, and more combined cycle units are put into the market.
The heating scheme adopted by the existing combined cycle unit is that an electric heater heats natural gas, the scheme of the electric heater is that high-temperature and high-pressure gas generated by combustion of the natural gas and air pushes a gas turbine to rotate, the gas turbine drives a generator to generate electricity, and a part of generated electricity is transmitted to the electric heater to heat the natural gas, so that the scheme has low initial investment, high operation energy consumption and large consumption of electric energy, greatly increases the service power of a power plant, and reduces the economy of the power plant in the long run; meanwhile, natural gas can generate a large amount of high-temperature flue gas to release heat after combustion, and the high-temperature flue gas directly enters the environment through the exhaust pipe, so that the environment is polluted, and huge energy waste is caused.
Disclosure of Invention
The utility model aims at providing an it is not enough to above-mentioned prior art, provide one kind and utilize immersion natural gas heater to replace original electric heater to heat the natural gas and degree of depth is retrieved the gas-steam combined cycle flue gas waste heat recovery device of flue gas waste heat as the heat source.
The utility model adopts the technical scheme as follows:
a gas-steam combined cycle flue gas waste heat recovery device comprises a waste heat boiler, a condensate water main pipe, a condensate water heater, a deaerator, a desalting water tank and an immersion natural gas heater, wherein a natural gas flow pipe is arranged in the immersion natural gas heater, one end of the natural gas flow pipe is communicated with an air inlet of the immersion natural gas heater, the other end of the natural gas flow pipe is communicated with an air outlet of the immersion natural gas heater, the air inlet of the immersion natural gas heater is connected with a natural gas inlet manual door through a pipeline, the air outlet of the immersion natural gas heater is connected with a natural gas outlet manual door through a pipeline, a natural gas temperature regulating valve is arranged between an inlet end of the natural gas inlet manual door and an outlet end of the natural gas outlet manual door in parallel through a pipeline, a water supplementing pneumatic door is connected on the immersion natural gas heater through a pipeline, the outlet connection of demineralized water tank has outlet conduit, and outlet conduit divide into first branch and second branch, first branch links to each other with the import of moisturizing air door, the second branch is passed through the heat exchanger elevator pump and is linked to each other with the import of the waste heat recovery heat exchanger that sets up in exhaust-heat boiler afterbody flue, the export of waste heat recovery heat exchanger passes through the manual door of heater import and links to each other with immersion natural gas heater's water inlet, immersion natural gas heater's delivery port links to each other with the import of the female pipe of condensate through congealing the water heater elevator pump, the export of the female pipe of condensate links to each other with the import of congealing the water heater, congealing the export of water heater and the import of oxygen-eliminating device link to each other.
The heat exchanger emptying electric door and the safety valve drainage manual door are connected to an immersion natural gas heater of the device through pipelines respectively, and are connected with the safety valve.
The top of the immersion natural gas heater of the device is provided with a liquid level meter and an overflow port.
The bottom of the immersion natural gas heater of the device is provided with a waterproof door for overhauling and isolating the immersion natural gas heater.
A manual isolating door for an inlet of the heat exchanger is arranged between a lifting pump of the heat exchanger and an inlet of the waste heat recovery heat exchanger.
A drainage door is arranged between an outlet of the waste heat recovery heat exchanger and a manual door of an inlet of the heater.
A heater water level regulating valve is arranged between the water outlet of the immersion natural gas heater and the condensate heater lifting pump of the device.
The beneficial effects of the utility model are that:
(1) the utility model utilizes the immersion natural gas heater to replace the original electric heater to heat the natural gas, thereby further reducing the plant power rate and improving the safety and stability of the natural gas heating process;
(2) the utility model deeply recovers the flue gas waste heat in the waste heat boiler and uses the flue gas waste heat as the heat source in the natural gas heating process, thereby not only reducing the exhaust gas temperature, but also improving the heat utilization efficiency;
(3) the utility model discloses get into immersion natural gas heater with demineralized water as the heat carrier and heat the natural gas, the demineralized water that has heated finally gets into the condensation water main pipe again and retrieves, and the water recovery benefit is showing, and simultaneously, the unit operation discharges zero and increases;
(4) the utility model discloses combine flue gas, demineralized water and natural gas system, utilize the energy high efficiency to make the whole efficiency of gas-steam combined cycle unit improve.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure 1, a waste heat boiler; 2. a waste heat recovery heat exchanger; 3. a condensed water heater; 4. a deaerator; 5. a demineralized water tank; 6. an immersed natural gas heater; 7. a natural gas flow tube; 8. a natural gas inlet manual door; 9. a natural gas outlet manual door; 10. a natural gas temperature regulating valve; 11. a water replenishing pneumatic door; 12. a first shunt; 13. a second branch circuit; 14. a heat exchanger lift pump; 15. a heater inlet manual door; 16. a condensate heater lift pump; 17. a condensate header; 18. the heat exchanger empties the electric door; 19. a safety valve drainage manual door; 20. a waterproof door; 21. a manual isolating door at the inlet of the heat exchanger; 22. a hydrophobic gate; 23. a water level regulating valve of the heater.
Detailed Description
The invention will be further described with reference to the accompanying drawings:
as shown in fig. 1, the utility model discloses it includes exhaust-heat boiler 1, the main pipe 17 of condensate water, congeals water heater 3, oxygen-eliminating device 4, demineralized water tank 5 and immersion natural gas heater 6, wherein is equipped with natural gas flow pipe 7 in the immersion natural gas heater 6, and the one end of natural gas flow pipe 7 and immersion natural gas heater 6's air inlet switch-on, the other end and immersion natural gas heater 6's gas outlet switch-on make the natural gas that gets into in the immersion natural gas heater 6 flow in natural gas flow pipe 7.
The gas inlet of the immersion natural gas heater 6 is connected with a natural gas inlet manual door 8 through a pipeline, and the gas outlet of the immersion natural gas heater 6 is connected with a natural gas outlet manual door 9 through a pipeline, so that an operator can conveniently control natural gas to enter the immersion natural gas heater 6 from the natural gas inlet manual door 8 and flow out from the natural gas outlet manual door 9; a natural gas temperature regulating valve 10 is arranged between the inlet end of the natural gas inlet manual door 8 and the outlet end of the natural gas outlet manual door 9 in parallel through a pipeline and is used for mixing heated natural gas flowing out of the natural gas outlet manual door 9 by natural gas which is not heated so as to control the temperature of the flowing natural gas within a reasonable range.
There is water supply pneumatic door 11 through the pipe connection on immersion natural gas heater 6 for carry out the moisturizing to immersion natural gas heater 6, guarantee that its heat transfer is high-efficient going on.
The exit linkage of the demineralized water tank 5 of this device has outlet conduit, and outlet conduit divide into first branch 12 and second branch 13, and wherein first branch 12 links to each other with the import of moisturizing pneumatic door 11, and opening and closing of moisturizing pneumatic door 11 is controlled manually to operating personnel to in the demineralized water of control demineralized water tank 5 gets into immersion natural gas heater 6, make the demineralized water flow in immersion natural gas heater 6's cavity.
The second branch 13 is connected with an inlet of a waste heat recovery heat exchanger 2 arranged in a tail flue of the waste heat boiler 1 through a heat exchanger lifting pump 14, and the waste heat boiler 1 absorbs the waste heat of the flue gas by taking demineralized water as a medium, so that the exhaust gas temperature is reduced, the heat energy of the waste heat of the flue gas is reasonably applied to natural gas heating, and the energy waste is reduced; the heat exchanger lifting pump 14 is used for improving the drainage pressure of the desalted water and ensuring that the working medium overcomes the circulation resistance in the pipeline of the waste heat recovery heat exchanger 2; wherein a manual isolating door 21 of a heat exchanger inlet is arranged between the heat exchanger lifting pump 14 and the inlet of the waste heat recovery heat exchanger 2, so that an operator can manually control the discharge amount of the desalted water.
The outlet of the waste heat recovery heat exchanger 2 of the device is connected with the water inlet of the immersion natural gas heater 6 through the heater inlet manual door 15, so that the heated desalted water enters the immersion natural gas heater 6 through the heater inlet manual door 15 and heats the natural gas flowing in the natural gas flow pipe 7 in an immersion mode; wherein a hydrophobic door 22 is arranged between the outlet of the waste heat recovery heat exchanger 2 and the manual heater inlet door 15 and is used for discharging air and other non-condensable gases in the pipeline.
The water outlet of an immersion natural gas heater 6 of the device is connected with the inlet of a condensate water main pipe 17 through a condensate water heater lifting pump 16, the outlet of the condensate water main pipe 17 is connected with the inlet of a condensate water heater 3, the outlet of the condensate water heater 3 is connected with the inlet of a deaerator 4, desalted water discharged by the immersion natural gas heater 6 is pressurized by the condensate water heater lifting pump 16, then the desalted water converges into the condensate water main pipe 17 and then enters the condensate water heater 3 for heating, and finally the desalted water is used as condensate water to enter the deaerator 4; a heater water level regulating valve 23 is installed between the water outlet of the immersion natural gas heater 6 and the condensate heater lift pump 16, and the heater water level regulating valve 23 is pneumatically regulated to control the flow rate in the immersion natural gas heater 6, thereby achieving the purpose of regulating the temperature of the natural gas by the demineralized water.
The immersion natural gas heater 6 of the device is respectively connected with a heat exchanger emptying electric door 18 and a safety valve drainage manual door 19 through pipelines, and the heat exchanger emptying electric door 18 and the safety valve drainage manual door 19 are both connected with a safety valve to ensure that the immersion natural gas heater 6 keeps safe pressure; the top of the immersion natural gas heater 6 is provided with a liquid level meter and an overflow port for observing and maintaining the liquid level of the desalted water therein; the bottom of the immersion natural gas heater 6 is provided with a watertight door 20 for maintenance isolation thereof.
The utility model discloses a use as follows: natural gas to be heated enters a natural gas flow pipe 7 in the immersion natural gas heater 6 from a natural gas inlet manual door 8, flowing in the natural gas flow pipe 7, heating by desalted water flowing in the inner cavity of the immersed natural gas heater 6 in the flowing process, the desalted water flowing into the immersion natural gas heater 6 as a heat source firstly enters the waste heat recovery heat exchanger 2 from the desalted water tank 5 through the heat exchanger lifting pump 14 to absorb the flue gas waste heat of the waste heat boiler 1, enters the immersion natural gas heater 6 through the heater inlet manual door 15 after being heated, heating the natural gas in the natural gas flow pipe 7 in an immersed mode, enabling the heated natural gas to flow out of the natural gas outlet manual door 9, and opening the natural gas temperature regulating valve 10 to perform mixing regulation on the heated natural gas if the temperature of the heated natural gas is not in a reasonable range; and the demineralized water that is used for heating the natural gas passes through heater water level control valve 23 and flows out, and demineralized water flows out the back, improves pressure through congealing the female pipe 17 of condensate water and then gets into congealing the water heater 3 and heat, finally gets into in the oxygen-eliminating device 4 as the condensate water to this circulation.
Other parts which are not described in the present invention are the same as those in the prior art.
Claims (7)
1. The utility model provides a gas-steam combined cycle flue gas waste heat recovery device, characterized by it includes exhaust-heat boiler (1), condensate water main pipe (17), condensate water heater (3), oxygen-eliminating device (4), demineralized water tank (5) and immersion natural gas heater (6), be equipped with natural gas flow pipe (7) in immersion natural gas heater (6), the one end of natural gas flow pipe (7) and the air inlet switch-on of immersion natural gas heater (6), the other end and the gas outlet switch-on of immersion natural gas heater (6), the air inlet of immersion natural gas heater (6) has natural gas inlet hand door (8) through the pipe connection, the gas outlet of immersion natural gas heater (6) has natural gas outlet hand door (9) through the pipe connection, be equipped with natural gas through parallelly connected the natural gas pipeline between the entry end of natural gas inlet hand door (8) and the outflow end of natural gas outlet hand door (9) through parallelly connected The system comprises a temperature regulating valve (10), a water supplementing pneumatic door (11) is connected to the immersion natural gas heater (6) through a pipeline, an outlet of the desalted water tank (5) is connected with a water outlet pipeline, the water outlet pipeline is divided into a first branch (12) and a second branch (13), the first branch (12) is connected with an inlet of the water supplementing pneumatic door (11), the second branch (13) is connected with an inlet of a waste heat recovery heat exchanger (2) arranged in a tail flue of the waste heat boiler (1) through a heat exchanger lifting pump (14), an outlet of the waste heat recovery heat exchanger (2) is connected with a water inlet of the immersion natural gas heater (6) through a heater inlet manual door (15), a water outlet of the natural gas immersion heater (6) is connected with an inlet of a condensed water main pipe (17) through a condensed water heater lifting pump (16), an outlet of the condensed water main pipe (17) is connected with an inlet of the condensed water heater (3), the outlet of the condensed water heater (3) is connected with the inlet of the deaerator (4).
2. The gas-steam combined cycle flue gas waste heat recovery device according to claim 1, wherein the immersion natural gas heater (6) is connected with a heat exchanger emptying electric door (18) and a safety valve drainage manual door (19) through pipelines, and the heat exchanger emptying electric door (18) and the safety valve drainage manual door (19) are both connected with a safety valve.
3. The gas-steam combined cycle flue gas waste heat recovery device of claim 1, wherein a liquid level meter and an overflow port are arranged at the top of the immersion natural gas heater (6).
4. The gas-steam combined cycle flue gas waste heat recovery device of claim 1, wherein the bottom of the immersion natural gas heater (6) is provided with a waterproof door (20) for maintenance and isolation.
5. The gas-steam combined cycle flue gas waste heat recovery device of claim 1, wherein a heat exchanger inlet manual isolation door (21) is installed between the heat exchanger lift pump (14) and the inlet of the waste heat recovery heat exchanger (2).
6. The gas-steam combined cycle flue gas waste heat recovery device according to claim 1, wherein a drainage door (22) is installed between the outlet of the waste heat recovery heat exchanger (2) and the heater inlet manual door (15).
7. The gas-steam combined cycle flue gas waste heat recovery device of claim 1, wherein a heater water level regulating valve (23) is installed between the water outlet of the immersion natural gas heater (6) and the condensate heater lift pump (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120239639.0U CN214836580U (en) | 2021-01-28 | 2021-01-28 | Gas-steam combined cycle flue gas waste heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120239639.0U CN214836580U (en) | 2021-01-28 | 2021-01-28 | Gas-steam combined cycle flue gas waste heat recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214836580U true CN214836580U (en) | 2021-11-23 |
Family
ID=78953743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120239639.0U Expired - Fee Related CN214836580U (en) | 2021-01-28 | 2021-01-28 | Gas-steam combined cycle flue gas waste heat recovery device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214836580U (en) |
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2021
- 2021-01-28 CN CN202120239639.0U patent/CN214836580U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211123 |