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 PDF

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Publication number
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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CN
China
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water
low
pressure
steam
heater
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CN201320833227.5U
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Chinese (zh)
Inventor
徐钢
张晨旭
张鑫
黄圣伟
杨勇平
刘彤
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华北电力大学
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Priority to CN201320833227.5U priority Critical patent/CN203703942U/en
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Abstract

The utility model discloses a boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water in the field of energy conservation. The system mainly comprises a high temperature rotary air preheater, a low temperature rotary air preheater, a flue gas/water heat exchanger and warm air blowers, wherein the flue gas/water heat exchanger is arranged in series between the high temperature rotary air preheater and the low temperature rotary air preheater; boiler feed water in a heat regenerative system is heated by high temperature flue gas flowing through the flue gas/water heat exchanger; a part of high pressure extracted steam is squeezed out to return to the steam turbine for continuous expansion work; the absorbed heat, reduced in the rotary air preheaters, of cold air is compensated with low-grade heat energy of No.7 low pressure extracted steam and No.8 low pressure extracted steam of the steam turbine. According to the system, the heat energy of boiler-side high temperature flue gas is replaced by utilizing the heat energy of the low-grade extracted steam, and is introduced into the heat regenerative system on the steam turbine side to heat the boiler feed water; the high pressure extracted steam is squeezed out, so that the purposes of improving the heat-to-power conversion efficiency of a unit and reducing the consumption of power/coal supply to the unit are realized.

Description

For heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater
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)

1. for heating a furnace side smoke heat energy effective utilization system for steam turbine side backheat feedwater, it is characterized in that: 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.
2. according to claim 1 a kind of for heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater, it is characterized in that: 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) outlet, and its fume side outlet is connected to low temperature rotary regenerative air preheater (3) entrance.
3. according to claim 1 a kind of for heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater, it is characterized in that: described cigarette water-to-water heat exchanger (4) water side entrance is connected to No. 3 high-pressure heater outlets by corresponding pipeline valve, cigarette water-to-water heat exchanger (4) water side outlet is connected with No. 2 high-pressure heater outlets by corresponding pipeline valve.
4. according to claim 1 a kind of for heating the furnace side smoke heat energy effective utilization system of steam turbine side backheat feedwater, it is characterized in that: described No. 7 steam air heaters (11) and No. 8 steam air heaters (12) entrance 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.
CN201320833227.5U 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 CN203703942U (en)

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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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Cited By (4)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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

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Granted publication date: 20140709

Termination date: 20151218