CN104047647B - Utilize the system that the flue gas low-temperature waste heat of generator set generates electricity - Google Patents
Utilize the system that the flue gas low-temperature waste heat of generator set generates electricity Download PDFInfo
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- CN104047647B CN104047647B CN201310082479.3A CN201310082479A CN104047647B CN 104047647 B CN104047647 B CN 104047647B CN 201310082479 A CN201310082479 A CN 201310082479A CN 104047647 B CN104047647 B CN 104047647B
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- flue gas
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- waste heat
- cylinder
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000003546 flue gas Substances 0.000 title claims abstract description 41
- 239000002918 waste heat Substances 0.000 title claims abstract description 30
- 230000005611 electricity Effects 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000011084 recovery Methods 0.000 claims abstract description 25
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 25
- 230000000051 modifying Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000003517 fume Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
- 206010022000 Influenza Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000011030 bottleneck Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000002708 enhancing Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000001172 regenerating Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention provides a kind of system utilizing the flue gas low-temperature waste heat of generator set to generate electricity, comprise the first steam generating system, condensing water conduit and the low-pressure heater be located on condensing water conduit and vapour condenser, first steam generating system comprises low pressure (LP) cylinder, low-pressure heater is connected with low pressure (LP) cylinder, also comprise flue gas heat recovery device and the second steam generating system, flue gas heat recovery device comprises endotherm section and heat release section, endotherm section is located in boiler flue, and heat release section to be placed in from condensing water conduit on parallel branch condensed water branch road out; Second steam generating system comprises the second connected steam turbine and the second generator, and the second steam turbine is connected with low pressure (LP) cylinder by extraction steam pipe, and low pressure (LP) cylinder, the second steam turbine are all connected with vapour condenser by exhaust steam pipe.The present invention can safe retrieving low-temperature flue gas waste heat, and the waste heat of recovery is come again to generate electricity by the mode of cascade utilization, solving the generating of traditional recovery waste heat cannot the problem of accurate-metering, solve large power plant low temperature exhaust heat can not the problem of efficiency utilization simultaneously, makes power plant reach the object of energy-conserving and environment-protective.
Description
Technical field
The present invention relates to thermal power generation technical field, particularly relate to a kind of system utilizing the flue gas low-temperature waste heat of generator set to generate electricity.
Background technique
When country advocates energy-conserving and environment-protective and enterprise energetically in order to self-growth, the efficiency of boiler is more and more higher, the height of efficiency of boiler is mainly reflected in the height of flue gas loss, and temperature of exhaust fume has intuitively reacted flue gas loss, therefore temperature of exhaust fume has been one of important indicator weighing efficiency of boiler.Temperature of exhaust fume is higher, flue gas loss is larger, efficiency of boiler is lower, therefore the temperature of exhaust fume of boiler is all lower at present, the temperature of exhaust fume of present large medium-size boiler is all general at about 135 DEG C, particularly large-sized boiler, because its air preheater is generally rotary regenerative air heater, therefore its temperature of exhaust fume may be lower.
Although the temperature of exhaust fume of boiler has been down to very low at present, along with the development of power-saving technology, still temperature of exhaust fume can be down to by related art scheme lower, thus recovery section fume afterheat, and ensure that the normal safe of boiler runs simultaneously.Because exhaust gas temperature is lower, the waste heat grade reclaimed with general heat recovery technology is all lower, in Generator Set, not suitable effective Land use systems, cause heat recovery project can not use in Generator Set, this is also one of energy-conservation subject matter run into of low temperature exhaust heat of current Generator Set.And in Generator Set, low-grade heat energy is very abundant comparatively speaking, therefore whether its a large amount of low-grade heat energy can be utilized by some technological scheme, qualitative change is caused with quantitative change, thus the more high-grade heat energy of part can be obtained, and this part high-grade heat energy is effectively utilized? this is the energy-conservation bottleneck run into of low-temperature flue gas waste heat of present Generator Set, and its subject matter is not how recovery waste heat, but how the waste heat reclaimed effectively utilizes.
Now general flue gas waste heat recovery technology is all utilize waste heat to heat demineralized water, to reduce the consumption of drawing gas of low-pressure heater, the steam done work in steam turbine like this can increase, but because this part steam grade is lower, its acting generating efficiency of steam turbine for large-sized unit is lower, and have impact on the balance of drawing gas of steam generator system, this part of saving is drawn gas and can not be utilized efficiently, and this part amount be used effectively can not effectively be measured, cause amount of energy saving cannot accurate-metering.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of system utilizing the flue gas low-temperature waste heat of generator set to generate electricity, for solving the problems referred to above that prior art exists.
For achieving the above object and other relevant objects, the invention provides a kind of system utilizing the flue gas low-temperature waste heat of generator set to generate electricity, comprise the first steam generating system, condensing water conduit, and the low-pressure heater be located on condensing water conduit and vapour condenser, first steam generating system comprises low pressure (LP) cylinder, described low-pressure heater is connected with described low pressure (LP) cylinder, also comprise flue gas heat recovery device and the second steam generating system, described flue gas heat recovery device comprises endotherm section and heat release section, described endotherm section is located in boiler flue, described heat release section to be placed in from described condensing water conduit on parallel branch condensed water branch road out, second steam generating system comprises the second connected steam turbine and the second generator, and the second steam turbine is connected with described low pressure (LP) cylinder by extraction steam pipe, and described low pressure (LP) cylinder, the second steam turbine are all connected with described vapour condenser by exhaust steam pipe.
Preferably, also comprise control system, the first modulating valve that described condensed water branch road is established, the second modulating valve that described extraction steam pipe is established, and the temperature transducer be located on described endotherm section, described first modulating valve, the second modulating valve and described temperature transducer are all connected with described control system.
Preferably, described endotherm section is positioned at described boiler flue end.
Preferably, described low-pressure heater is one-level low-pressure heater or multistage low-pressure heater.
Preferably, the import and export of described condensed water branch road lay respectively at the both sides of described low-pressure heater.
Preferably, the amount of drawing gas that described second steam turbine is used is equal with the amount of drawing gas of being saved by described flue gas heat recovery device heating condensate water.
As mentioned above, the system utilizing the flue gas low-temperature waste heat of generator set to generate electricity of the present invention, there is following beneficial effect: can safe retrieving low-temperature flue gas waste heat, and the mode of the waste heat of recovery by cascade utilization is generated electricity, make power plant reach the object of energy-conserving and environment-protective; Reclaim low-temperature flue gas waste heat heating boiler feed water system, save with this and draw gas, and drawing gas of saving is directly used in generating, the second steam turbine selected is selected for the parameter of drawing gas of saving, therefore the former power generation system generating efficiency of drawing gas back than traditional is high, and do not destroy the balance of drawing gas of original steam power generation system, reduce the impact normally run original system, on energy contract mangement project, energy-saving effect is significantly and conveniently adjust amount of energy saving.
Accompanying drawing explanation
Fig. 1 is shown as the system schematic utilizing the flue gas low-temperature waste heat of generator set to generate electricity of the present invention.
Element numbers explanation
1 low-pressure heater
2 exhaust steam pipes
3 low pressure (LP) cylinders
4 extraction steam pipes
5 second modulating valve
6 vapour condenser
7 second steam turbine
8 second generators
9 boiler flues
10 flue gas heat recovery devices
11 first modulating valve
12 condensed water branch roads
13 condensing water conduits
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Refer to Fig. 1.Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, content all only in order to coordinate specification to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 1, the invention provides a kind of system utilizing the flue gas low-temperature waste heat of generator set to generate electricity, this generator set excellent finger pure condensate formula unit, it comprises the first steam generating system, the condensing water conduit 13 of water is sent to boiler, and the low-pressure heater 1 be located on condensing water conduit 13 and vapour condenser 6, first steam generating system comprises low pressure (LP) cylinder 3, the steam inlet of low-pressure heater 1 is connected with low pressure (LP) cylinder 3, this first steam generating system is the power generation system in original generator set, also comprise flue gas heat recovery device 10 and the second steam generating system, flue gas heat recovery device 10 comprises endotherm section and heat release section, endotherm section is located in boiler flue 9, heat release section to be placed in from condensing water conduit 13 on parallel branch condensed water branch road 12 out, second steam generating system comprises the second connected steam turbine 7 and the second generator 8, second steam turbine 7 is connected with described low pressure (LP) cylinder 3 by extraction steam pipe 4, and low pressure (LP) cylinder 3, second steam turbine 6 is all connected with vapour condenser 6 by exhaust steam pipe 2.The present invention adds the second steam generating system on original first steam generating system basis, enhance electricity, improve smoke pre-heating utilization ratio simultaneously, it adopts and is arranged in boiler flue 9 by flue gas heat recovery device 10, absorption portion fume afterheat, then Decay heat removal is given the condensed water of coming from condensed water branch road 12, this part condensed water of heating to heat it in low-pressure heater 1 by from drawing gas in low pressure (LP) cylinder 3 originally, therefore save this part to draw gas, this part draws gas and enters into the second steam turbine 7 by extraction steam pipe 4, and do work in the second steam turbine, this second steam turbine is not the first steam turbine in original first steam generating system, it can utilize this part to draw gas, second steam turbine drives the second generator 8 to do work and produces electric energy, the exhaust steam finishing merit enters into vapour condenser 6 by exhaust steam pipe 2.
The present invention reclaims low-temperature flue gas waste heat, by saving the utilization of drawing gas of former steam generator system to effective utilization of this waste heat, generated electricity by drawing gas of saving, improve the efficiency utilization of low-temperature flue gas preheating with this, improve the generated energy of whole generator set.
For ease of regulating, the import and export of above-mentioned condensed water branch road 12 lay respectively at the both sides of low-pressure heater 1, and it forms the structure in parallel with the condensing water conduit of low-pressure heater section.
The present invention also comprises control system, the first modulating valve 11 that condensed water branch road 12 is established, the second modulating valve 5 that extraction steam pipe 4 is established, and be located at the temperature transducer on endotherm section, the first modulating valve 11, second modulating valve 5 and temperature transducer are all connected with control system.Condensed water branch road 12 is provided with the first modulating valve 11, regulate by the heating-condensing water yield of control system to flue gas heat recovery device 10, regulate the endotherm section wall surface temperature of flue gas heat recovery device 10 simultaneously, ensure that it runs under the operating mode of safety.Extraction steam pipe 4 is provided with the second modulating valve 5, second modulating valve is connected with control system, operationally, the amount of drawing gas entering the second steam turbine 7 from low pressure (LP) cylinder 3 can be regulated in real time, steam generating system is not affected, and this part amount of drawing gas should be equal with the amount of drawing gas of being saved by flue gas heat recovery device 10 heating condensate water.Namely the amount of drawing gas that the second steam turbine is used is equal with the amount of drawing gas of being saved by flue gas heat recovery device heating condensate water.Above-mentioned endotherm section is positioned at boiler flue end, can avoid affecting using of boiler flue other equipment interior so hot.Above-mentioned low-pressure heater 1 is one-level low-pressure heater or multistage low-pressure heater.
Draw gas after doing work in the second steam turbine 7 and become exhaust steam, exhaust steam enters vapour condenser 6 by exhaust steam pipe 2, gets back in condensate system after condensation.In the present embodiment, the second steam turbine 7 is low-pressure turbine.
In sum, the system utilizing the flue gas low-temperature waste heat of generator set to generate electricity of the present invention, the condensed water heated with steam (steam namely in low pressure (LP) cylinder) is heated by flue gas heat, namely heating condensate water is carried out with low-grade waste heat, save the steam of high-grade heat energy, and utilize drawing gas of saving to generate electricity, make heat energy realize cascade utilization, solving the generating of traditional recovery waste heat cannot the problem of accurate-metering, substantially increases utilization efficiency of heat energy.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (4)
1. the system utilizing the flue gas low-temperature waste heat of generator set to generate electricity, comprise the first steam generating system, condensing water conduit (13), and the low-pressure heater (1) be located on condensing water conduit (13) and vapour condenser (6), first steam generating system comprises low pressure (LP) cylinder (3), described low-pressure heater (1) is connected with described low pressure (LP) cylinder (3), it is characterized in that, also comprise flue gas heat recovery device (10) and the second steam generating system, described flue gas heat recovery device (10) comprises endotherm section and heat release section, described endotherm section is located in boiler flue (9), described heat release section to be placed in from described condensing water conduit on parallel branch condensed water branch road (12) out, and the import and export of described condensed water branch road (12) lay respectively at the both sides of described low-pressure heater (1), second steam generating system comprises connected the second steam turbine (7) and the second generator (8), second steam turbine (7) is connected with described low pressure (LP) cylinder (3) by extraction steam pipe (4), and described low pressure (LP) cylinder (3), the second steam turbine (7) are all connected with described vapour condenser (6) by exhaust steam pipe (2), the amount of drawing gas that described second steam turbine (7) is used is equal with the amount of drawing gas of being saved by described flue gas heat recovery device (10) heating condensate water.
2. the system utilizing the flue gas low-temperature waste heat of generator set to generate electricity according to claim 1, it is characterized in that: also comprise control system, the first modulating valve (11) that described condensed water branch road (12) is established, the second modulating valve (5) that described extraction steam pipe (4) is established, and the temperature transducer be located on described endotherm section, described first modulating valve (11), the second modulating valve (5) and described temperature transducer are all connected with described control system.
3. the system utilizing the flue gas low-temperature waste heat of generator set to generate electricity according to claim 1, is characterized in that: described endotherm section is positioned at described boiler flue end.
4. the system utilizing the flue gas low-temperature waste heat of generator set to generate electricity according to claim 1, is characterized in that: described low-pressure heater (1) is one-level low-pressure heater or multistage low-pressure heater.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310082479.3A CN104047647B (en) | 2013-03-15 | 2013-03-15 | Utilize the system that the flue gas low-temperature waste heat of generator set generates electricity |
| PCT/CN2013/079193 WO2014139253A1 (en) | 2013-03-15 | 2013-07-11 | System using low-temperature waste heat of gas of generator unit to generate power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310082479.3A CN104047647B (en) | 2013-03-15 | 2013-03-15 | Utilize the system that the flue gas low-temperature waste heat of generator set generates electricity |
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| Publication Number | Publication Date |
|---|---|
| CN104047647A CN104047647A (en) | 2014-09-17 |
| CN104047647B true CN104047647B (en) | 2015-12-02 |
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| CN201310082479.3A Active CN104047647B (en) | 2013-03-15 | 2013-03-15 | Utilize the system that the flue gas low-temperature waste heat of generator set generates electricity |
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| CN102734787A (en) * | 2012-07-06 | 2012-10-17 | 上海伏波环保设备有限公司 | Concurrent recycling system for boiler smoke afterheat |
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| CN203130171U (en) * | 2013-03-15 | 2013-08-14 | 上海伏波环保设备有限公司 | System utilizing low temperature exhaust heat of flue gas of generating set for power generation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06300215A (en) * | 1993-04-09 | 1994-10-28 | Mitsubishi Heavy Ind Ltd | Steam plant |
| WO2008119784A2 (en) * | 2007-03-30 | 2008-10-09 | Siemens Aktiengesellschaft | Arrangement with a steam turbine and a condenser |
-
2013
- 2013-03-15 CN CN201310082479.3A patent/CN104047647B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270675A (en) * | 2008-04-24 | 2008-09-24 | 华北电力大学 | Solar energy and coal-burning unit combined thermal power generation system |
| EP2392786A1 (en) * | 2009-01-30 | 2011-12-07 | Hitachi, Ltd. | Power plant |
| CN101892879A (en) * | 2010-07-09 | 2010-11-24 | 绍兴文理学院 | Thermal power plant waste heat generating set using working medium phase-change circulation |
| CN102678206A (en) * | 2011-03-07 | 2012-09-19 | 中国电力工程顾问集团华东电力设计院 | Thermodynamic system for combined heat recovery of power plant |
| CN102767822A (en) * | 2012-06-27 | 2012-11-07 | 华北电力大学 | Integrated system for pre-heating air and condensed water of turbine in grading manner by using boiler smoke |
| CN102734787A (en) * | 2012-07-06 | 2012-10-17 | 上海伏波环保设备有限公司 | Concurrent recycling system for boiler smoke afterheat |
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