CN203703942U - Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water - Google Patents
Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water Download PDFInfo
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- CN203703942U CN203703942U CN201320833227.5U CN201320833227U CN203703942U CN 203703942 U CN203703942 U CN 203703942U CN 201320833227 U CN201320833227 U CN 201320833227U CN 203703942 U CN203703942 U CN 203703942U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000003546 flue gas Substances 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 title claims abstract description 18
- 230000001172 regenerating effect Effects 0.000 title claims description 21
- 238000000605 extraction Methods 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 16
- 239000000779 smoke Substances 0.000 description 14
- 235000019504 cigarettes Nutrition 0.000 description 12
- 239000003517 fume Substances 0.000 description 8
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
本实用新型公开了属于节能领域的一种用于加热汽机侧回热给水的炉侧烟气热能高效利用系统，其主要包括高低温回转式空气预热器、烟水换热器和暖风器。本系统将烟水换热器装置串联布置于高温回转式空气预热器和低温回转式空气预热器之间，利用流经烟水换热器的高温烟气加热回热系统中的锅炉给水，排挤部分高压抽汽返回汽轮机继续膨胀做功。冷空气在回转式空气预热器中减少的吸热量由汽轮机7号低压抽汽和8号低压抽汽的低品位热能来弥补。该系统利用低品位抽汽的热能置换出炉侧高温烟气的热能，并将其引入汽机侧的回热系统加热锅炉给水，排挤高压抽汽，从而实现提高机组热功转换效率，降低机组供电煤耗的目的。
The utility model discloses a high-efficiency utilization system of flue gas heat energy on the side of the furnace for heating the reheated feed water on the side of the steam turbine, belonging to the field of energy saving, which mainly includes a high and low temperature rotary air preheater, a smoke-water heat exchanger and an air heater . In this system, the smoke-water heat exchanger is arranged in series between the high-temperature rotary air preheater and the low-temperature rotary air preheater, and the boiler feed water in the recuperation system is heated by the high-temperature flue gas flowing through the smoke-water heat exchanger. , the displaced part of the high-pressure extracted steam returns to the steam turbine to continue to expand and do work. The reduced heat absorption of cold air in the rotary air preheater is compensated by the low-grade heat energy of steam turbine No. 7 low-pressure extraction steam and No. 8 low-pressure extraction steam. The system uses the heat energy of low-grade extraction steam to replace the heat energy of high-temperature flue gas on the furnace side, and introduces it into the heat recovery system on the turbine side to heat the boiler feed water and squeeze out high-pressure extraction steam, so as to improve the heat power conversion efficiency of the unit and reduce the coal consumption of power supply for the unit the goal of.
Description
Technical field
The utility model belongs to boiler smoke heat energy and rationally utilizes field, a kind of furnace side smoke heat energy effective utilization system feeding water for heating steam turbine side backheat during mainly for power station unit variable parameter operation.Utilize steam turbine low-pressure bled steam preheating to enter stove air, improve air preheater entrance wind-warm syndrome, reduce the thermal discharge of flue gas in air preheater, and this part heat is introduced to the feedwater of cigarette water-to-water heat exchanger heating boiler, this system, in the situation that not reducing exhaust gas temperature, has better realized " temperature counterpart, cascade utilization ".Meanwhile, this system reform is smaller, is applicable to the Large-sized Coal-fired Power group degree of depth energy-conservation.
Background technology
The energy-saving and emission-reduction of large electric power plant unit are Chinese important energy source strategies.In China, coal-burning power plant has consumed the coal production of national nearly half, along with rising steadily of Coal Energy Source price in recent years, also day by day increase taking coal as main cost of electricity-generating, each firepower unit is faced with huge economizer pressure, constantly seeks the new technology of energy-conservation of consumption reduction, realizes energy-saving and emission-reduction.
Occur cold end corrosion phenomenon for fear of heated surface at the end of boiler, in thermal power plant, the exhaust gas temperature of boiler is generally 120-130 DEG C of left and right; The exhaust gas temperature that uses high-sulfur combustor reaches 150-160 DEG C of left and right, and the exhaust gas temperature of old-fashioned unit boiler out of the ordinary even can reach more than 180 DEG C.Exhaust gas temperature is too high directly cause in flue gas can waste heat recovery energy without just utilizing directly discharged to atmosphere.Current most of power plant adopts smoke limestone wet desulfurizing process, by spray mode, exhaust gas temperature has been reduced to 50 DEG C, though reached best desulfurization temperature, has consumed a large amount of water equal energy sources, has also increased smoke discharge amount.Therefore, the utilizing boiler tail flue gas heat energy, reduce full factory net coal consumption rate and become the important topic in current power station of economic environmental protection how.
The prospect of UTILIZATION OF VESIDUAL HEAT IN technology application is extensive.Abroad, begin one's study already and apply the equipment that rationally utilizes boiler tail flue gas heat energy.As: Cologne, Germany Nideraussem1000MW level brown coal generating set is installed at waste heat exchange device in the bypass flue of air preheater, adopt separation flue system fully to reduce exhaust gas temperature, introducing portion flue gas is to the interior heating boiler feedwater of bypass flue simultaneously.SchwarzePumpe power plant of Germany 2 X 800MW brown coal generating sets have installed gas cooler additional after electrostatic precipitator, utilize fume afterheat to carry out heating boiler feedwater.In China, Waigaoqiao of Shaihai power plant, in three phases enlarging million kilowatt ultra supercritical unit engineering project, is just applied to afterheat heat exchanger ending portion fume afterheat back and forth.
The utility model proposes one and can meet the requirement of desulfurization dust-removal system inlet temperature, can reclaim again the new system of cold junction optimization of a large amount of fume afterheats, this system not only can realize energy counterpart, cascade utilization, and less on existing equipment impact.Therefore be applicable to the technological transformation of existing coal fired power plant for heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater.
Summary of the invention
The purpose of this utility model is the smoke heat energy Rational Utilization for fired power generating unit, proposes a kind of for heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater.
To achieve these goals, the technical solution adopted in the utility model is: this system is made up of two-stage rotary regenerative air preheater, one-level cigarette water-to-water heat exchanger and two-stage steam air heater, on the smoke discharging pipe of boiler 1, be in series with successively high temperature rotating regenerative air heater 2, cigarette water-to-water heat exchanger 4, low temperature rotary regenerative air preheater 3, steam turbine high-pressure cylinder 5, Steam Turbine Through IP Admission 6 and turbine low pressure cylinder 7 are connected in series with generator 8, turbine low pressure cylinder 7 is delivered to low-pressure heater by condenser 10 No. 8 successively condensate water, No. 7 low-pressure heaters, No. 6 low-pressure heaters, No. 5 low-pressure heaters, deliver to again oxygen-eliminating device 9, be sent to successively high-pressure heater No. 3 through oxygen-eliminating device 9 condensate water, No. 2 high-pressure heaters, No. 1 high-pressure heater, No. 2 high-pressure heater is connected in parallel by valve and fume gas condensation water heater 4, No. 7 warm-air driers 11 are connected with drawing gas for No. 7 by valve, No. 8 warm-air driers 12 are connected with drawing gas for No. 8 by valve.
Described cigarette water-to-water heat exchanger 4 is arranged between high temperature rotating regenerative air heater 2 and low temperature rotary regenerative air preheater 3, its fume side entrance is connected to high temperature rotating regenerative air heater 2 and exports, and its fume side outlet is connected to low temperature rotary regenerative air preheater 3 entrances.
Described cigarette water-to-water heat exchanger 4 water side entrances are connected to No. 3 high-pressure heater outlets by corresponding pipeline valve, and cigarette water-to-water heat exchanger 4 water side outlets are connected with No. 2 high-pressure heater outlets by corresponding pipeline valve.
Described 11 and No. 8 steam air heater 12 entrances of No. 7 steam air heaters be connected respectively to No. seven of turbine low pressure cylinder and No. eight extraction lines on, the steam after condensation heat is connected on the drain water piping of No. 7 low-pressure heaters and No. 8 low-pressure heaters by corresponding pipeline, valve respectively.
Extract the part steam turbine low-pressure preheating cold air that draws gas for heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater, improve the temperature of air preheater entrance cold air, reduce like this caloric receptivity of cold air in air preheater, then reclaimed this part high-grade fume afterheat by cigarette water-to-water heat exchanger 4 is set in two-stage rotary regenerative air preheater.The principle of this system based on energy counterpart, cascade utilization, high efficiency recovered flue gas heat energy, energy-saving effect is obvious.
Brief description of the drawings
Fig. 1 is in the furnace side smoke heat energy effective utilization system of heating steam turbine side backheat feedwater.
Detailed description of the invention
It is a kind of in the furnace side smoke heat energy effective utilization system of heating steam turbine side backheat feedwater that the utility model provides.Be explained below in conjunction with drawings and embodiments.
The furnace side smoke heat energy effective utilization system feeding water in heating steam turbine side backheat as shown in Figure 1.This optimization integrated system mainly comprises high temperature rotating regenerative air heater 2, flue gas heat-exchange unit 4, low temperature rotary regenerative air preheater 3, steam turbine high-pressure cylinder 5, Steam Turbine Through IP Admission 6 and turbine low pressure cylinder 7 and generator 8, condenser 10, warm-air drier 11 and warm-air drier 12.Its principle is as follows:
On the smoke discharging pipe of boiler 1, be in series with successively high temperature rotating regenerative air heater 2, cigarette water-to-water heat exchanger 4, low temperature rotary regenerative air preheater 3, steam turbine high-pressure cylinder 5, Steam Turbine Through IP Admission 6 and turbine low pressure cylinder 7 are connected in series with generator 8, turbine low pressure cylinder 7 is delivered to low-pressure heater by condenser 10 No. 8 successively condensate water, No. 7 low-pressure heaters, No. 6 low-pressure heaters, No. 5 low-pressure heaters, deliver to again oxygen-eliminating device 9, be sent to successively high-pressure heater No. 3 through oxygen-eliminating device 9 condensate water, No. 2 high-pressure heaters, No. 1 high-pressure heater, No. 2 high-pressure heater is connected in parallel by valve and fume gas condensation water heater 4, No. 7 warm-air drier 11 is drawn gas and is connected with 7# by valve, No. 8 warm-air driers 12 are connected with drawing gas for No. 8 by valve.
Cigarette water-to-water heat exchanger 4 is arranged between high temperature rotating regenerative air heater 2 and low temperature rotary regenerative air preheater 3, the flue gas of 400 DEG C of left and right of economizer exit flow through successively high temperature rotating regenerative air heater 2, cigarette water-to-water heat exchanger 4, low temperature rotary regenerative air preheater 3.
Cigarette water-to-water heat exchanger 4 water side entrances are connected to No. 3 high-pressure heater outlets by corresponding pipeline valve, and cigarette water-to-water heat exchanger 4 water side outlets are connected with No. 2 high-pressure heater outlets by corresponding pipeline valve.
11 and No. 8 steam air heaters 12 of No. 7 steam air heaters extract No. seven of part turbine low pressure cylinder and No. eight preheatings of drawing gas enter the cold air before air preheater, improve the temperature of cold air, reduce the caloric receptivity of cold air in air preheater.Steam after condensation heat fills in corresponding drain water piping through drainage pump.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320833227.5U CN203703942U (en) | 2013-12-18 | 2013-12-18 | Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320833227.5U CN203703942U (en) | 2013-12-18 | 2013-12-18 | Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water |
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| CN203703942U true CN203703942U (en) | 2014-07-09 |
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| CN201320833227.5U Expired - Fee Related CN203703942U (en) | 2013-12-18 | 2013-12-18 | Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976635A (en) * | 2015-07-02 | 2015-10-14 | 东方电气集团东方锅炉股份有限公司 | Boiler tail exhaust gas heat utilization system |
| CN105401987A (en) * | 2015-12-08 | 2016-03-16 | 广州粤能电力科技开发有限公司 | Steam-extraction superheat utilization system for double-reheat stream turbine for heating boiler secondary air |
| CN105526599A (en) * | 2016-01-26 | 2016-04-27 | 华北电力大学 | Clean type coal-fired boiler smoke discharging waste heat quality improving using system |
| CN106678863A (en) * | 2016-12-07 | 2017-05-17 | 上海发电设备成套设计研究院 | Smoke water composite heating system and method for lignite-fired unit |
| CN111140870A (en) * | 2020-01-17 | 2020-05-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-quality heat utilization system of machine furnace |
| CN112594019A (en) * | 2020-12-13 | 2021-04-02 | 东北电力大学 | Energy cascade efficient utilization system of supercritical coal-fired generator set |
-
2013
- 2013-12-18 CN CN201320833227.5U patent/CN203703942U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976635A (en) * | 2015-07-02 | 2015-10-14 | 东方电气集团东方锅炉股份有限公司 | Boiler tail exhaust gas heat utilization system |
| CN105401987A (en) * | 2015-12-08 | 2016-03-16 | 广州粤能电力科技开发有限公司 | Steam-extraction superheat utilization system for double-reheat stream turbine for heating boiler secondary air |
| CN105526599A (en) * | 2016-01-26 | 2016-04-27 | 华北电力大学 | Clean type coal-fired boiler smoke discharging waste heat quality improving using system |
| CN105526599B (en) * | 2016-01-26 | 2018-05-25 | 华北电力大学 | The upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system |
| CN106678863A (en) * | 2016-12-07 | 2017-05-17 | 上海发电设备成套设计研究院 | Smoke water composite heating system and method for lignite-fired unit |
| CN111140870A (en) * | 2020-01-17 | 2020-05-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-quality heat utilization system of machine furnace |
| CN112594019A (en) * | 2020-12-13 | 2021-04-02 | 东北电力大学 | Energy cascade efficient utilization system of supercritical coal-fired generator set |
| CN112594019B (en) * | 2020-12-13 | 2022-11-25 | 东北电力大学 | Energy cascade efficient utilization system of supercritical coal-fired generator set |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20151218 |
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| EXPY | Termination of patent right or utility model |