CN203421669U - Comprehensive heat utilization system of boiler tail - Google Patents
Comprehensive heat utilization system of boiler tail Download PDFInfo
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- CN203421669U CN203421669U CN201320473515.4U CN201320473515U CN203421669U CN 203421669 U CN203421669 U CN 203421669U CN 201320473515 U CN201320473515 U CN 201320473515U CN 203421669 U CN203421669 U CN 203421669U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model relates to a comprehensive heat utilization system of a boiler tail. The comprehensive heat utilization system of the boiler tail comprises a low-energy-level steam extraction pipeline, a steam air heater, an air preheater and a coal economizer/denitration device outlet flue, wherein the low-energy-level steam extraction pipeline is installed at the low-energy-level end of a steam turbine, the steam air heater is installed on a boiler air inlet duct, and the air preheater is installed on the boiler air inlet duct and located above the steam air heater. The low-energy-level steam extraction pipeline is connected to the steam air heater. The coal economizer/denitration device outlet flue is provided with two branch circuits. One branch circuit is connected to an air preheater rear flue through the air preheater, and the other branch circuit is connected to the air preheater rear flue through a water-feeding coal economizer. The air preheater rear flue is connected to a dust remover. The outlet end of the water-feeding coal economizer is connected to a main water-feeding pipeline of a water-feeding pump outlet and connected with a water-feeding operation platform inlet pipeline through a regulating valve. Low-energy-level steam extraction of the steam turbine is utilized, extracted steam is heated with cold-blast air through the steam air heater, wherein the cold-blast air enters a boiler, and the aims that the efficiency of the turbine is improved, and fuel coal is saved are achieved.
Description
Technical field
The utility model relates to thermal power generating technology field, is specifically related to a kind of boiler tail heat utilization system.
Background technology
One of the thermal efficiency loss maximum of Steam Turbine in Fire Power Plant is turbine discharge cold source energy, conventional steam turbine has all designed heat regenerative system for this reason, by extracted steam from turbine heat-setting water and feedwater, reclaim steam heat, reduce cold source energy, and then improve turbine thermodynamic efficiency.But heat regenerative system can only reclaim fraction steam, still there is most steam to condense through condenser, by cooling tower or air cooling tower heat exchange loses heat.If the steam discharge of steam turbine or the heat that draws gas can be recycled, reduce cold source energy, will greatly improve turbine efficiency.And conventional boiler afterbody is provided with air preheater, 300～1000 MW units of take are example, and air preheater entrance flue gas temperature is generally at 370～400 ℃, approximately 120～150 ℃ of the flue-gas temperatures of discharge.And approximately 20 ℃ of the cold wind temperature of air preheater entrance, the temperature difference is very large, exists the waste of high level heat.
Utility model content
The utility model is in order to overcome the deficiency of above technology, provide a kind of by the comprehensive utilization of conventional extracted steam from turbine system and boiler tail air and gas system to improve plant thermal efficiency, save the boiler tail heat utilization system of power plant's gross coal consumption rate.
The utility model overcomes the technical scheme that its technical problem adopts:
This boiler tail heat utilization system, comprise the low-lying level bleed steam pipework that is installed on steam turbine low-lying level end, be installed on the steam air heater on inlet air of boiler road, be installed on inlet air of boiler road and be positioned at air preheater and economizer/denitration outlet flue of steam air heater top, described low-lying level bleed steam pipework is connected in steam air heater, described economizer/denitration outlet flue has two branch roads, one branch road is connected in air preheater rear pass through air preheater, another branch road is connected in air preheater rear pass through feedwater economizer, described air preheater rear pass is connected in deduster, described feedwater economizer exit end is connected in the main feed water pipe road of feed pump outlet, its port of export is connected with feedwater operating desk inlet duct through control valve.
In order to realize, utilize flue gas part condensate water, also comprise the condensate water economizer that is installed in economizer/denitration outlet flue and is positioned at feedwater economizer branch road, the port of export of described condensate water economizer is connected in the main condensate pipeline of oxygen-eliminating device entrance through control valve, its arrival end is connected in low-pressure heater arrival end condensing water conduit, and the described low-pressure heater port of export is connected in oxygen-eliminating device.
Above-mentioned low-lying level bleed steam pipework comprises final stage bleed steam pipework and the inferior final stage bleed steam pipework being installed on steam turbine, and described final stage bleed steam pipework and time final stage bleed steam pipework are connected in steam air heater by pipeline.
In order to adjust the flow that participates in heat exchange flue gas, also to comprise, be installed on respectively damper II and damper I on economizer/denitration outlet flue two branch roads and that lay respectively at air preheater and feedwater economizer lower end.
In order to realize the recycling of condensed water after steam air heater heat exchange, also comprise condenser, described final stage bleed steam pipework and inferior final stage bleed steam pipework are connected in condenser by hydrophobic pipeline II and hydrophobic pipeline I respectively after steam air heater, in described hydrophobic pipeline I and hydrophobic pipeline II, are respectively arranged with control valve and shut-off valve.
The beneficial effects of the utility model are: utilize the final stage bleed steam pipework of steam turbine low-lying level to draw gas and by steam air heater, heat the inlet air of boiler road 16 of flowing through enter stove cold wind.By heating cold wind, reclaim the heat of this part steam to reach the object that reduces cold source energy, can save part high-temperature flue gas, the high-temperature flue gas of saving feeds water through economizer/denitration outlet flue heating part simultaneously.By utilizing the flue gas of high level partly to feed water to save drawing gas of steam turbine high level, the high level of saving draws gas and can continue acting at steam turbine.Reach raising turbine efficiency, save coal-fired object.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
In figure, 1. 2. final stage bleed steam pipeworks of final stage bleed steam pipework, 3. steam air heater 4. air preheater 5. condensate water economizers 6. feedwater economizer 7. economizers/denitration outlet flue 8. damper I 9. low-pressure heater 10. deduster 11. condenser 12. control valve 13. shut-off valve 14. hydrophobic pipeline I 15. hydrophobic pipeline II 16. inlet air of boiler road 17. air preheater rear pass 18. damper II 19. feedwater operating desk 20. high-pressure heater 21. oxygen-eliminating device 22. feed pump 23. control valves.
The specific embodiment
Below in conjunction with 1 pair of the utility model of accompanying drawing, be described further.
This boiler tail heat utilization system, it comprises the low-lying level bleed steam pipework that is installed on steam turbine low-lying level end, be installed on the steam air heater 3 on inlet air of boiler road 16, be installed on inlet air of boiler road 16 and be positioned at air preheater 4 and economizer/denitration outlet flue 7 of steam air heater 3 tops, described low-lying level bleed steam pipework is connected in steam air heater 3, described economizer/denitration outlet flue 7 has two branch roads, one branch road is connected in air preheater rear pass 17 through air preheater 4, another branch road is connected in air preheater rear pass 17 through feedwater economizer 6, described air preheater rear pass 17 is connected in deduster 10, described feedwater economizer 6 arrival ends are connected in the main feed water pipe road of feed pump 22 outlets, its port of export is connected with feedwater operating desk 19 inlet ducts through control valve 23, economizer 6 and high-pressure heater 20 parallel runnings are equivalent to feed water.High-pressure heater 20 two ends are connected to feed pump 22 and feedwater operating desk 19.Low-lying level bleed steam pipework draws gas and holds extraction steam to pass through steam air heater 3 heat exchange by cold air heating to 85～115 ℃ inlet air of boiler road 16 from steam turbine low-pressure, and the high-temperature flue gas that the cold wind of heating is carried by economizer/denitration outlet flue 7 more afterwards finally makes the cold air heating in inlet air of boiler road 16 arrive temperature required through air preheater 4 heat exchange.Because steam has carried out elementary heating to cold wind, therefore can save part high-temperature flue gas, the high-temperature flue gas of saving enters the part feedwater of squeezing into feed pump 22 in feedwater economizer 6 by another branch road and carries out heat exchange, after heating, enter feedwater operating desk 19, another part feedwater enters feedwater operating desk 19 after still being heated and heated by high-pressure heater 20.Therefore by high-temperature flue gas heating part, feed water, reduced the amount of drawing gas of steam turbine high level, improved turbine efficiency, saved fire coal.Low-lying level bleed steam pipework can comprise final stage bleed steam pipework 1 and the inferior final stage bleed steam pipework 2 being installed on steam turbine, and final stage bleed steam pipework 1 and time final stage bleed steam pipework 2 are connected in steam air heater 3 by pipeline.When steam-turbine unit load reduction, extraction pressure reduces, the vapour source of final stage bleed steam pipework 1 can switch to time final stage bleed steam pipework 2, by that analogy, the vapour source of the inferior final stage bleed steam pipework 2 of steam turbine can switch to drawing gas of level third from the bottom, the steam extracting will enter stove cold air heating in the inlet air of boiler road 16 being connected with boiler through steam air heater 3, to guarantee that cold air heating is heated to 85～115 ℃.By that analogy, when penultimate pressure does not reach instructions for use, can bleed steam pipework be installed in steam turbine level third from the bottom, utilize steam that level third from the bottom extracts will in the inlet air of boiler road 16 being connected with boiler, to enter stove cold air heating through steam air heater 3.
For steam turbine, level last, penultimate stage, level third from the bottom are that final stage, inferior final stage, level third from the bottom are low-lying level, and the some levels before low-lying level are high level.Utilize the final stage bleed steam pipework 1 of steam turbine low-lying level and/or inferior final stage bleed steam pipework 2 draws gas and by steam air heater 3 heating, flow through inlet air of boiler road 16 enter stove cold wind.By heating cold wind, reclaim the heat of this part steam to reach the object that reduces cold source energy, can save part high-temperature flue gas, the high-temperature flue gas of saving is through the 6 heat exchange heating part feedwater of feedwater economizer simultaneously.Because feedwater adopts flue gas, can save drawing gas of steam turbine high level, the high level of saving draws gas and can continue acting at steam turbine.Reach the object that improves unit efficiency.The low-pressure steam that turbine system has been equivalent to take out more to steam turbine.But can save the steam of the high voltage parameter of steam turbine.Therefore improve the efficiency of unit.For conventional fired power generating unit, all can implement, both be applicable to new-built unit, also be applicable to Transformation of Unit.For conventional 300～1000 MW units, can save coal-fired 3～5g/kWh.And to boiler air preheater 4, improved the entrance cold wind temperature of air preheater 4, reduce the corrosion risk of air preheater 4.
In economizer/denitration outlet flue 7 and be arranged in feedwater economizer 6 branch roads condensate water economizer 5 can be installed, the port of export of condensate water economizer 5 is connected in the main condensate pipeline of oxygen-eliminating device 21 entrances through control valve 23, its arrival end is connected in low-pressure heater 9 arrival end condensing water conduits, the low-pressure heater port of export is connected in oxygen-eliminating device 21, is equivalent to condensate water economizer and low-pressure heater 9 parallel runnings.Condensate water is delivered to water supply system except a part enters after oxygen-eliminating device 21 is processed after by low-pressure heater 9 heating by feed pump 22, its another part directly enters in condensate water economizer 5 by pipeline, condensate water flows into oxygen-eliminating device 21 after high-temperature flue gas heat exchange again at condensate water economizer 5, therefore can reduce the steam consumption quantity of low-pressure heater 9, further save the energy, improved the utilization rate of high-temperature flue gas.
By on 7 liang of branch roads of economizer/denitration outlet flue and be positioned at air preheater 4 and feedwater economizer 6 lower ends damper II 18 and damper I 8 are installed respectively, to realize, adjust the high-temperature flue gas flow that enters air preheater 4 and enter feedwater economizer 6 and condensate water economizer 5, to facilitate according to concrete environment for use, adjust.
Steam turbine last stage bleed steam pipework 1 or inferior final stage bleed steam pipework 2 are connected in condenser 11 by hydrophobic pipeline II 15 and hydrophobic pipeline I 14 respectively after steam air heater 3.Steam condensation Cheng Shui after heat exchange, is delivered to condenser 11 recyclings through hydrophobic pipeline II 15 and gas exhaust piping I 14, has saved water resource, provides cost savings.In hydrophobic pipeline I 14 and hydrophobic pipeline II 15, be respectively arranged with control valve 12 and shut-off valve 13, by control valve 12, can regulate the steam flow that the final stage of steam turbine is drawn gas and inferior final stage is drawn gas, can replacing control valve 12 for convenience detach by closing shut-off valve 13 after control valve 12 damages.
Claims (5)
1. a boiler tail heat utilization system, it is characterized in that: comprise the low-lying level bleed steam pipework that is installed on steam turbine low-lying level end, be installed on the steam air heater (3) on inlet air of boiler road (16), be installed on inlet air of boiler road (16) and go up and be positioned at air preheater (4) and economizer/denitration outlet flue (7) of steam air heater (3) top, described low-lying level bleed steam pipework is connected in steam air heater (3), described economizer/denitration outlet flue (7) has two branch roads, one branch road is connected in air preheater rear pass (17) through air preheater (4), another branch road is connected in air preheater rear pass (17) through feedwater economizer (6), described air preheater rear pass (17) is connected in deduster (10), described feedwater economizer (6) port of export is connected in the main feed water pipe road of feed pump (22) outlet, its port of export is connected with feedwater operating desk (19) inlet duct through control valve (23).
2. boiler tail heat utilization system according to claim 1, it is characterized in that: also comprise the condensate water economizer (5) that is installed in economizer/denitration outlet flue (7) and is positioned at feedwater economizer (6) branch road, the port of export of described condensate water economizer (5) is connected in the main condensate pipeline of oxygen-eliminating device (21) entrance through control valve (23), its arrival end is connected in low-pressure heater (9) arrival end condensing water conduit, and described low-pressure heater (9) port of export is connected in oxygen-eliminating device (21).
3. boiler tail heat utilization system according to claim 1 and 2, it is characterized in that: described low-lying level bleed steam pipework comprises final stage bleed steam pipework (1) and the inferior final stage bleed steam pipework (2) being installed on steam turbine, described final stage bleed steam pipework (1) and time final stage bleed steam pipework (2) are connected in steam air heater (3) by pipeline.
4. boiler tail heat utilization system according to claim 3, is characterized in that: also comprise and be installed on respectively damper II (18) and damper I (8) on economizer/denitration outlet flue (7) two branch roads and that lay respectively at air preheater (4) and feedwater economizer (6) lower end.
5. boiler tail heat utilization system according to claim 3, it is characterized in that: also comprise condenser (11), described final stage bleed steam pipework (1) and inferior final stage bleed steam pipework (2) are connected in condenser (11) by hydrophobic pipeline II (15) and hydrophobic pipeline I (14) respectively after steam air heater (3), are respectively arranged with control valve (12) and shut-off valve (13) in described hydrophobic pipeline I (14) and hydrophobic pipeline II (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320473515.4U CN203421669U (en) | 2013-08-05 | 2013-08-05 | Comprehensive heat utilization system of boiler tail |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320473515.4U CN203421669U (en) | 2013-08-05 | 2013-08-05 | Comprehensive heat utilization system of boiler tail |
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| CN203421669U true CN203421669U (en) | 2014-02-05 |
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| CN201320473515.4U Expired - Fee Related CN203421669U (en) | 2013-08-05 | 2013-08-05 | Comprehensive heat utilization system of boiler tail |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939935A (en) * | 2014-04-02 | 2014-07-23 | 北京龙源冷却技术有限公司 | Boiler blower inlet air heating system |
| CN107062298A (en) * | 2017-05-26 | 2017-08-18 | 华北电力大学 | The system and heat exchange module of vapor and its heat in a kind of embrane method recovered flue gas |
-
2013
- 2013-08-05 CN CN201320473515.4U patent/CN203421669U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939935A (en) * | 2014-04-02 | 2014-07-23 | 北京龙源冷却技术有限公司 | Boiler blower inlet air heating system |
| CN103939935B (en) * | 2014-04-02 | 2016-08-17 | 北京龙源冷却技术有限公司 | Boiler fan intake air heating system |
| CN107062298A (en) * | 2017-05-26 | 2017-08-18 | 华北电力大学 | The system and heat exchange module of vapor and its heat in a kind of embrane method recovered flue gas |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140205 Termination date: 20190805 |
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| CF01 | Termination of patent right due to non-payment of annual fee |