CN113432143A - Low-temperature flue gas waste heat recovery system - Google Patents
Low-temperature flue gas waste heat recovery system Download PDFInfo
- Publication number
- CN113432143A CN113432143A CN202110760461.9A CN202110760461A CN113432143A CN 113432143 A CN113432143 A CN 113432143A CN 202110760461 A CN202110760461 A CN 202110760461A CN 113432143 A CN113432143 A CN 113432143A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- low
- steam
- cooling water
- circulating cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 123
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000002918 waste heat Substances 0.000 title claims abstract description 44
- 238000011084 recovery Methods 0.000 title abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000000498 cooling water Substances 0.000 claims abstract description 50
- 238000000605 extraction Methods 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 13
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012716 precipitator Substances 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 206010022000 influenza Diseases 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention relates to a system for recovering low-temperature flue gas waste heat, which comprises: the low-temperature flue gas enters the flue gas heat exchanger through the bypass flue and is mixed with circulating cooling water in the flue gas heat exchanger, circulating cooling water absorbs waste heat of the low-temperature flue gas and then is converted into circulating cooling water hot water to be discharged, and the low-temperature flue gas is mixed with the circulating cooling water and then is discharged through the chimney. By adding the bypass flue and the flue gas heat exchanger on the basis of the original smoke exhaust system, low-temperature flue gas enters the flue gas heat exchanger after passing through the bypass flue and is mixed with circulating cooling water in the flue gas heat exchanger, so that the circulating cooling water absorbs waste heat of the low-temperature flue gas and is converted into circulating cooling water hot water, and the recovery of the low-temperature flue gas waste heat is realized.
Description
Technical Field
The invention relates to the field of flue gas waste heat recovery, in particular to a low-temperature flue gas waste heat recovery system.
Background
The energy consumption of China is the first in the world, and the coal consumption ratio is still high. In an energy production structure in 2018, raw coal accounts for 68.3%, crude oil accounts for 7.2%, natural gas accounts for 5.7%, and hydroelectric power, nuclear power, wind power and the like account for 18.8%. Coal still occupies the leading position of an energy structure, and in 2020, the percentage of electric coal in China accounting for the consumption of coal is improved to more than 60% by proposing action plans for energy conservation, emission reduction, upgrading and reconstruction of coal and electricity (2014-2020). Meanwhile, the high-efficiency coal-fired unit in China is low in utilization hours, high in capacity and high in parameter, the supercritical unit frequently participates in peak shaving, the high-efficiency coal-fired unit cannot operate in the optimal working state, the energy efficiency advantage is difficult to exert, and the emission of carbon dioxide and pollutants is increased to a certain extent. Researches show that the heat loss of the exhaust gas accounts for more than 60% of the total heat loss of the boiler, the coal consumption can be reduced by about 2g/(kW.h) when the exhaust gas temperature is reduced by 20 ℃, and the method has great significance on the energy use efficiency.
At present, the existing flue gas waste heat recovery in China is only limited to the flue gas waste heat recovery at 130 ℃ at an outlet of an air preheater, an inlet of an induced draft fan, an outlet of a dust remover or an outlet of the induced draft fan, and a system for recovering the low-temperature flue gas waste heat at about 50 ℃ at an inlet of a chimney does not exist at present.
Disclosure of Invention
The invention aims to provide a system for recovering low-temperature flue gas waste heat, which realizes the recovery of the low-temperature flue gas waste heat by additionally arranging a bypass flue and a flue gas heat exchanger.
In order to achieve the purpose, the invention provides the following scheme:
a system for low temperature flue gas waste heat recovery, the system comprising: the low-temperature flue gas enters the flue gas heat exchanger through the bypass flue, the circulating cooling water in the flue gas heat exchanger is mixed with the circulating cooling water in the flue gas heat exchanger, the circulating cooling water absorbs the waste heat of the low-temperature flue gas and then is converted into circulating cooling water hot water to be discharged, and the low-temperature flue gas is discharged from the chimney after being mixed with the circulating cooling water.
Optionally, the system further comprises a first electric valve and a second electric valve, wherein the first electric valve is arranged on the bypass flue, the second electric valve is arranged on the original flue parallel to the bypass flue, and the second electric valve is connected with the wet electric dust collector;
when the low-temperature flue gas enters the flue gas heat exchanger through the bypass flue and then is discharged through the chimney; when bypass flue or during gas heater trouble, first electrically operated valve is in the closed condition, second electrically operated valve is in the open mode, the low temperature flue gas warp former flue gas gets into again warp in the wet-type electrostatic precipitator the chimney discharges.
Optionally, the recirculated cooling water in the flue gas heat exchanger comes from a steam heat pump, the steam heat pump is connected with the flue gas heat exchanger, recirculated cooling water enters the steam heat pump after being converted into recirculated cooling water heating water in the flue gas heat exchanger, the steam heat pump is used for heating a part of condensed water at the outlet of the condensed water pump after the heat energy of the recirculated cooling water heating water is promoted by the parameter, and the recirculated cooling water cooled after the condensed water is heated enters the flue gas heat exchanger to be recycled.
Optionally, the system further comprises a steam turbine, the steam turbine is connected with the steam heat pump, one path of steam in four-section steam extraction of the steam turbine is introduced into the steam heat pump, the other path of steam is that the steam heat pump promotes the heat energy of the circulating cooling water hot water to do work, and the other path of steam is converted into condensed water after doing work and is introduced into a condenser connected with the condensed water pump to be recycled.
Optionally, a condensed water pipeline connected to the steam heat pump is arranged at an outlet of the condensed water pump, the condensed water pipeline is used for introducing a part of condensed water at the outlet of the condensed water pump into the steam heat pump, and the part of condensed water is heated in the steam heat pump and then introduced into an outlet of the second low-pressure heater of the steam turbine through a return water pipeline.
Optionally, a third electric valve is arranged on the condensate pipe, and when the third electric valve is in an open state, a part of the condensate at the outlet of the condensate pump is introduced into the steam heat pump through the condensate pipe.
Optionally, a regulating valve is arranged on the condensed water pipeline, and the regulating valve is used for controlling the amount of the condensed water flowing from the condensed water pump to the steam heat pump.
Optionally, a fourth electrically operated valve is arranged on the water return pipeline, and when the fourth electrically operated valve is in an open state, the part of the condensed water is heated in the steam heat pump and then is introduced into an outlet of the second low-pressure heater of the steam turbine through the water return pipeline.
Optionally, the system is used for retrieving the low temperature flue gas waste heat of boiler chimney entrance, works as when the system is used for retrieving the low temperature flue gas waste heat of boiler chimney entrance, the system still includes boiler, dust remover, draught fan and desulfurization absorption tower, the low temperature flue gas that the boiler produced passes through the dust remover the draught fan with enter behind the desulfurization absorption tower bypass flue.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the system for recovering the low-temperature flue gas waste heat is additionally provided with the bypass flue and the flue gas heat exchanger on the basis of the original smoke exhaust system, so that the low-temperature flue gas enters the flue gas heat exchanger through the bypass flue and is mixed with the circulating cooling water in the flue gas heat exchanger, the circulating cooling water absorbs the low-temperature flue gas waste heat and is converted into circulating cooling water hot water, and the recovery of the low-temperature flue gas waste heat is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system for recovering waste heat of low-temperature flue gas according to embodiment 1 of the present invention;
description of the symbols:
1-a bypass flue; 2-flue gas heat exchanger; 3-a chimney; 4-a first electrically operated valve; 5-a second electrically operated valve; 6-original flue; 7-wet electric precipitation; 8-a steam heat pump; 9-a condensate pump; 10-a steam turbine; 11-a condenser; 12-a condensate pipe; 13-a water return pipe; 14-a second low pressure heater; 15-a first low pressure heater; 16-a third low pressure heater; 17-a fourth low pressure heater; 18-a third electrically operated valve; 19-a regulating valve; 20-a fourth electrically operated valve; 21-a boiler; 22-a dust remover; 23-a draught fan; and 24-a desulfurization absorption tower.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a system for recovering low-temperature flue gas waste heat, which realizes the recovery of the low-temperature flue gas waste heat by additionally arranging a bypass flue and a flue gas heat exchanger.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
The present embodiment provides a system for recovering waste heat of low-temperature flue gas, please refer to fig. 1, the system includes: the low-temperature flue gas enters the flue gas heat exchanger 2 through the bypass flue 1 and is mixed with circulating cooling water in the flue gas heat exchanger 2, the circulating cooling water absorbs the waste heat of the low-temperature flue gas and then is converted into circulating cooling water hot water to be discharged, and the low-temperature flue gas and the circulating cooling water are mixed and then are discharged through a chimney 3.
The flue gas at the inlet of the chimney 3 is low-temperature flue gas at about 50 ℃, however, the existing flue gas waste heat recovery is limited to the flue gas waste heat recovery at 130 ℃ at the outlet of the boiler air preheater, the inlet of the induced draft fan 23, the outlet of the dust remover 22 or the outlet of the induced draft fan 23. This embodiment is through setting up a bypass flue 1 and gas heater 2 in low temperature flue gas outlet department, lets in the low temperature flue gas in bypass flue 1 with the recirculated cooling water mixing among the gas heater 2, makes recirculated cooling water absorb the waste heat of low temperature flue gas, converts the recirculated cooling water hot water into to realize the recovery of low temperature flue gas waste heat. Meanwhile, after the low-temperature flue gas is mixed with the circulating cooling water, impurities in the flue gas are purified, the whitening of the flue gas is realized, and the discharged flue gas meets the requirements of environmental protection and standard emission.
The system shown in the embodiment can be used for recovering the low-temperature flue gas waste heat at the inlet of the boiler chimney 3, when the system is used for recovering the low-temperature flue gas waste heat at the inlet of the boiler chimney 3, the system further comprises a boiler 21, a dust remover 22, an induced draft fan 23 and a desulfurization absorption tower 24, and the low-temperature flue gas generated by the boiler 21 enters the bypass flue 1 after passing through the dust remover 22, the induced draft fan 23 and the desulfurization absorption tower 24. It should be noted that the system shown in this embodiment is not limited to recovering the waste heat of the low-temperature flue gas at the inlet of the boiler chimney 3, and can also be used for recovering the waste heat of the low-temperature flue gas discharged from other systems.
The system provided by the embodiment further comprises a first electric valve 4 and a second electric valve 5;
wherein, first electrically operated valve 4 sets up on bypass flue 1, and when first electrically operated valve 4 opened, low temperature flue gas got into bypass flue 1 through this valve. The second electric valve 5 is arranged on the original flue 6 parallel to the bypass flue 1, the second electric valve 5 is connected with the wet electric dust removal 7, and when the second electric valve 5 is opened, low-temperature flue gas enters the original flue 6 through the second electric valve 5.
When the flue gas heat exchanger operates normally, the first electric valve 4 is in an open state, the second electric valve 5 is in a closed state, and low-temperature flue gas enters the flue gas heat exchanger 2 through the bypass flue 1 and is discharged through the chimney 3; when the bypass flue 1 or the flue gas heat exchanger 2 has a fault, the first electric valve 4 is in a closed state, the second electric valve 5 is in an open state, and low-temperature flue gas enters the wet electric dust removal 7 through the original flue 6 and is discharged through the chimney 3.
In the existing flue gas recovery system, when a flue gas discharge system breaks down, the system needs to be shut down for maintenance, and the system provided by the embodiment can realize the recovery of low-temperature flue gas, and when any one of the flues breaks down, the other flue can be used as a standby flue, so that the system can be maintained online without stopping. However, it should be said that, when the bypass flue 1 is in fault, the flue gas enters the wet-type electric dust removal 7 through the original flue 6, and at this time, the recovery of the low-temperature flue gas waste heat cannot be realized, but the whole system can still realize the normal purification and then discharge of the flue gas, that is, the working process of flue gas discharge is not influenced.
The circulating cooling water in the flue gas heat exchanger 2 comes from a steam heat pump 8, the steam heat pump 8 is connected with the flue gas heat exchanger 2, the circulating cooling water is converted into circulating cooling water hot water in the flue gas heat exchanger 2 and then enters the steam heat pump 8, the steam heat pump 8 can be used for heating a part of condensed water at the outlet of a condensed water pump 9 after the heat energy of the circulating cooling water hot water is improved by parameters, and the circulating cooling water cooled after the condensed water is heated enters the flue gas heat exchanger 2 to be recycled.
The system of the embodiment may further include a steam turbine 10, the steam turbine 10 is connected to the steam heat pump 8, one path of steam in the four-stage extraction steam of the steam turbine 10 is introduced into the steam heat pump 8, the path of steam is used for the steam heat pump 8 to lift heat energy of the circulating cooling water hot water to do work, and the heat energy is converted into condensed water after the heat energy is done to be introduced into a condenser 11 connected to the condensed water pump 9 to be recovered.
A condensate pipe 12 connected with the steam heat pump 8 is arranged at the outlet of the condensate pump 9, the condensate pipe 12 is used for leading a part of condensate at the outlet of the condensate pump 9 to the steam heat pump 8, and the part of condensate is heated in the steam heat pump 8 and then is led to the outlet of a second low-pressure heater 14 of the steam turbine 10 through a return pipe 13.
It should be noted that, in general, a large unit is provided with eight stages of air extraction, wherein the first stage air extraction, the second stage air extraction and the third stage air extraction correspond to the high-pressure heaters No. 1, No. 2 and No. 3 respectively; the four-section air extraction supplies air to users such as a deaerator, a small steam turbine, auxiliary steam and the like; the five-section air extraction, the six-section air extraction, the seven-section air extraction and the eight-section air extraction respectively correspond to the No. 5, the No. 6, the No. 7 and the No. 8 low-pressure heaters.
As shown in fig. 1, in this embodiment, the steam turbine 10 includes four low-pressure heaters, an inlet of a first low-pressure heater 15 (i.e., No. 8 low-pressure heater) is connected to an outlet of the condensate pump 9, an inlet of a second low-pressure heater 14 (i.e., No. 7 low-pressure heater) is connected to an outlet of the first low-pressure heater 15, an inlet of a third low-pressure heater 16 (i.e., No. 6 low-pressure heater) is connected to an outlet of the second low-pressure heater 14, an inlet of a fourth low-pressure heater 17 (i.e., No. 5 low-pressure heater) is connected to an outlet of the third low-pressure heater 16, an outlet of the fourth low-pressure heater 17 is connected to a deaerator, and three high-pressure heaters (not shown in fig. 1) are further connected behind the deaerator.
In this embodiment, one path of steam in the four-stage air extraction of the steam turbine 10 is introduced into the steam heat pump 8, and is used to raise the heat energy parameter of the circulating cooling water hot water in the steam heat pump 8, the heat energy of the circulating cooling water hot water before parameter extraction is about 50 ℃, and after parameter extraction, the heat energy of the circulating cooling water hot water is about 95 ℃, the circulating cooling water hot water after parameter extraction is used to heat a part of condensed water at the outlet of the condensed water pump 9, and the part of condensed water is heated in the steam heat pump 8 and then introduced into the outlet of the second low-pressure heater 14 of the steam turbine 10 through the return water pipe 13, so that the air extraction amount of the steam turbine 10 is reduced, and the power supply coal consumption is reduced.
In this embodiment, a third electric valve 18 may be further disposed on the condensed water pipe 12, and when the third electric valve 18 is in an open state, a part of the condensed water at the outlet of the condensed water pump 9 is introduced into the steam heat pump 8 through the condensed water pipe 12.
The condensate pipe 12 may further be provided with a regulating valve 19, and the regulating valve 19 is used for controlling the amount of the condensate flowing from the condensate pump 9 to the steam heat pump 8, thereby realizing automatic control of the amount of the heated condensate.
A fourth electric valve 20 is provided on the water return pipe 13, and when the fourth electric valve 20 is in an open state, a part of the condensed water is heated in the steam heat pump 8 and then passes through the water return pipe 13 to the outlet of the second low pressure heater 14 of the steam turbine 10.
Most boiler flue gas waste heat recovery in the current market is that a low-temperature economizer or a low-temperature economizer is additionally arranged at a flue gas end of about 120-140 ℃ in front of a desulfurization system and behind an air preheater, a tube bundle of the economizer is directly contacted with flue gas, the economizer is seriously abraded and leaked, the resistance of a flue is greatly increased, the boiler cannot be isolated and overhauled in operation, and the loss of auxiliary equipment such as a draught fan 23 is increased. When the system of this embodiment is used for retrieving the low temperature flue gas waste heat of 3 entrances of boiler chimney, adopt the wet flue gas waste heat recovery of low temperature behind the desulfurization absorption tower 24, the condensate water does not have direct contact with the flue gas, reduce wear, low temperature flue gas waste heat recovery device and wet-type electrostatic precipitator 7 are each other reserve, can keep apart the maintenance in the operation, do not have the increase to the flue resistance, can reach flue gas waste heat recovery, improve the purpose of isolation maintenance in unit operating efficiency and the operation, can reach the flue gas and whiten again, guarantee that the requirement of environmental protection up to standard emission can retrieve the moisture cyclic utilization in the wet flue gas simultaneously, reduce water consumption.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A system for recovering waste heat of low-temperature flue gas is characterized by comprising: the low-temperature flue gas enters the flue gas heat exchanger through the bypass flue, the circulating cooling water in the flue gas heat exchanger is mixed with the circulating cooling water in the flue gas heat exchanger, the circulating cooling water absorbs the waste heat of the low-temperature flue gas and then is converted into circulating cooling water hot water to be discharged, and the low-temperature flue gas is discharged from the chimney after being mixed with the circulating cooling water.
2. The system of claim 1, further comprising a first electrically operated valve and a second electrically operated valve, wherein the first electrically operated valve is disposed on the bypass flue, the second electrically operated valve is disposed on an original flue juxtaposed to the bypass flue, and the second electrically operated valve is connected to a wet electric precipitator;
when the low-temperature flue gas enters the flue gas heat exchanger through the bypass flue and then is discharged through the chimney; when bypass flue or during gas heater trouble, first electrically operated valve is in the closed condition, second electrically operated valve is in the open mode, the low temperature flue gas warp former flue gas gets into again warp in the wet-type electrostatic precipitator the chimney discharges.
3. The system of claim 1, wherein the circulating cooling water in the flue gas heat exchanger is from a steam heat pump, the steam heat pump is connected with the flue gas heat exchanger, the circulating cooling water cold water is converted into the circulating cooling water hot water in the flue gas heat exchanger and then enters the steam heat pump, the steam heat pump is used for heating a part of condensed water at an outlet of a condensed water pump after the heat energy of the circulating cooling water hot water is increased by a parameter, and the circulating cooling water cooled after the condensed water is heated enters the flue gas heat exchanger to be recycled.
4. The system according to claim 3, characterized in that the system further comprises a steam turbine, the steam turbine is connected with the steam heat pump, one path of steam in four-stage steam extraction of the steam turbine is introduced into the steam heat pump, the one path of steam is used for the steam heat pump to raise heat energy of the circulating cooling water hot water to do work, and the one path of steam is converted into condensed water after doing work and is introduced into a condenser connected with the condensed water pump to be recycled.
5. The system according to claim 4, characterized in that a condensate pipe connected with the steam heat pump is arranged at the outlet of the condensate pump, the condensate pipe is used for leading a part of condensate at the outlet of the condensate pump to the steam heat pump, and the part of condensate is heated in the steam heat pump and then is led to the outlet of the second low-pressure heater of the steam turbine through a return pipe.
6. The system of claim 5, wherein a third electrically operated valve is provided in the condensate conduit, and when the third electrically operated valve is in an open state, a portion of the condensate at the condensate pump outlet passes through the condensate conduit to the steam heat pump.
7. The system of claim 5, wherein the condensate line is provided with a regulating valve for controlling the amount of condensate flowing from the condensate pump to the steam heat pump.
8. The system of claim 5, wherein the water return line is provided with a fourth electrically operated valve, and when the fourth electrically operated valve is in an open state, the portion of the condensed water is heated in the steam heat pump and then passes through the water return line to the outlet of the second low pressure heater of the steam turbine.
9. The system of claim 1, wherein the system is used for recovering low-temperature flue gas waste heat at an inlet of a boiler chimney, when the system is used for recovering the low-temperature flue gas waste heat at the inlet of the boiler chimney, the system further comprises a boiler, a dust remover, an induced draft fan and a desulfurization absorption tower, and low-temperature flue gas generated by the boiler enters the bypass flue after passing through the dust remover, the induced draft fan and the desulfurization absorption tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110760461.9A CN113432143B (en) | 2021-07-06 | 2021-07-06 | Low-temperature flue gas waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110760461.9A CN113432143B (en) | 2021-07-06 | 2021-07-06 | Low-temperature flue gas waste heat recovery system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113432143A true CN113432143A (en) | 2021-09-24 |
| CN113432143B CN113432143B (en) | 2022-10-11 |
Family
ID=77759010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110760461.9A Active CN113432143B (en) | 2021-07-06 | 2021-07-06 | Low-temperature flue gas waste heat recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113432143B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865454A (en) * | 2010-06-10 | 2010-10-20 | 上海电力学院 | Method for overheating steam of cooler waste heat boiler and device used in same |
| CN103775140A (en) * | 2012-12-18 | 2014-05-07 | 苟仲武 | Improved electricity generation system with pump assisting in condensing and cooling and electricity generation method of electricity generation system |
| CN104848199A (en) * | 2015-04-23 | 2015-08-19 | 张中印 | Method for recovering waste heat from power plant through absorption heat pump to heat boiler water |
| CN106765265A (en) * | 2017-01-05 | 2017-05-31 | 东方电气集团东方锅炉股份有限公司 | A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type |
| CN210772215U (en) * | 2019-06-21 | 2020-06-16 | 光大环保技术研究院（南京）有限公司 | Smoke tower integrated smoke waste heat recovery device for waste incineration power plant |
| CN113134425A (en) * | 2021-04-23 | 2021-07-20 | 华能国际电力股份有限公司上海石洞口第一电厂 | Wet-type electric dust removal device for coal-fired power plant |
-
2021
- 2021-07-06 CN CN202110760461.9A patent/CN113432143B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865454A (en) * | 2010-06-10 | 2010-10-20 | 上海电力学院 | Method for overheating steam of cooler waste heat boiler and device used in same |
| CN103775140A (en) * | 2012-12-18 | 2014-05-07 | 苟仲武 | Improved electricity generation system with pump assisting in condensing and cooling and electricity generation method of electricity generation system |
| CN104848199A (en) * | 2015-04-23 | 2015-08-19 | 张中印 | Method for recovering waste heat from power plant through absorption heat pump to heat boiler water |
| CN106765265A (en) * | 2017-01-05 | 2017-05-31 | 东方电气集团东方锅炉股份有限公司 | A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type |
| CN210772215U (en) * | 2019-06-21 | 2020-06-16 | 光大环保技术研究院（南京）有限公司 | Smoke tower integrated smoke waste heat recovery device for waste incineration power plant |
| CN113134425A (en) * | 2021-04-23 | 2021-07-20 | 华能国际电力股份有限公司上海石洞口第一电厂 | Wet-type electric dust removal device for coal-fired power plant |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113432143B (en) | 2022-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204923035U (en) | Processing system is synthesized to coal fired boiler's flue gas | |
| CN108443906B (en) | Flue gas waste heat utilization system and method based on multi-energy level and recirculated heating cold air | |
| CN104006401B (en) | The degree of depth of boiler of power plant fume afterheat is recycled and emission-reducing system | |
| CN201795471U (en) | Flue gas afterheat utilization system | |
| EP2942494B1 (en) | Coal fired oxy plant with heat integration | |
| CN203177151U (en) | Boiler flue gas waste heat recycling system with improved structure | |
| CN112128732B (en) | Waste steam and flue gas waste heat energy quality coupling and improving system | |
| CN104235928A (en) | Boiler flue gas waste heat heating system | |
| CN102839999B (en) | Small steam turbine exhaust steam cold source loss recovery system and method | |
| CN107149873B (en) | Energy-saving full-load denitration system | |
| CN204593353U (en) | A kind of integrated system of deep exploitation residual heat from boiler fume | |
| CN210729109U (en) | Novel coal-fired power generation ultralow emission flue gas pollution control system | |
| CN113432143B (en) | Low-temperature flue gas waste heat recovery system | |
| CN205717147U (en) | A kind of full load denitration utilizes and air preheater corrosion-and blocking-prevention coupled system with fume afterheat | |
| CN104976610A (en) | Medium-temperature coal economizer system and method thereof for recovering smoke afterheat | |
| CN109114583B (en) | Flue gas waste heat utilization system of coal-fired power plant and working method | |
| CN210197339U (en) | Combined system for effectively relieving blockage of ammonium bisulfate of air preheater | |
| CN114543070A (en) | Multi-medium low-temperature economizer system and control method thereof | |
| CN208687705U (en) | A kind of system that excision low pressure (LP) cylinder is coupled into automotive row with low-pressure coal saver | |
| CN203927882U (en) | Warm economizer system in one | |
| CN111828998A (en) | Novel energy-saving and environment-friendly system combining flue gas cooler with flue gas heater of air heater | |
| CN102954460B (en) | Power station boiler energy optimal utilization system | |
| CN203421669U (en) | Comprehensive heat utilization system of boiler tail | |
| CN111577460A (en) | Method for improving efficiency of gas turbine and removing white smoke | |
| CN215808445U (en) | Slag and flue gas waste heat comprehensive utilization system based on circulating fluidized bed boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |