CN107631289A - A kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system - Google Patents
A kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system Download PDFInfo
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- CN107631289A CN107631289A CN201710777927.XA CN201710777927A CN107631289A CN 107631289 A CN107631289 A CN 107631289A CN 201710777927 A CN201710777927 A CN 201710777927A CN 107631289 A CN107631289 A CN 107631289A
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The invention discloses a kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system, include heating agent water circulation system, condensate heat-exchange system, gas bypass system, the gas bypass system is connected in parallel at boiler flue gas outlet with air preheater, the heating agent water circulation pipe is connected with shell-and-tube heat exchanger, the heating agent water circulation pipe connection gas cooler, smoke re-heater and shell-and-tube heat exchanger, the condensate heat exchanging pipe connect shell-and-tube heat exchanger.The present invention solves the problems, such as that current fume afterheat does not recycle fully and chimney emits white cigarette.
Description
Technical field
The present invention relates to heat recovery technology field, and in particular to more than a kind of coal-burning power plant's heat supply initial station low temperature recovered flue gas
Hot systems.
Background technology
Cogeneration of heat and power is to improve energy utilization rate, one of important method of energy-saving and emission-reduction is realized, due to existing power generation dispatching
No matter mode unit size, generated electricity after building up by average using hourage scheduling, both do not consider energy factor, and do not pass through completely
The principle of thorough " electricity determining by heat ", it is impossible to make the energy-saving effect of cogeneration of heat and power must give full play to.If the flue gas tool discharged in boiler
There is higher temperature, the waste of heat can be caused, it is impossible to make full use of the waste heat of flue gas, in turn result in the waste of the energy.Although
Flue-gas temperature is reduced, and then reduce desulfurizing tower water consumption it has been proposed that by being reclaimed to fume afterheat in the prior art
Amount, the system for improving efficiency of dust collection, but do not propose fume afterheat being used for external heat supply.
Flue gas desulfurization mainly has two kinds of dry type flue gas desulfurizing and wet process of FGD.Wherein wet fuel gas desulfurizing technology stream
Journey, form and mechanism are similar, mainly using slurries such as lime stone (CaCO3), lime (CaO) or sodium carbonate (Na2CO3)
Make detergent, flue gas is washed in reaction tower, so as to remove the SO2 in flue gas.The existing 50 years history of this technique,
After continuously improving and improving, Technical comparing is ripe, and high (90%~98%) with desulfuration efficiency, unit capacity
Greatly, the advantages that coal adaptability is strong, and operating cost is relatively low and byproduct easily reclaims.Also it is exactly wet desulfurizing process so that desulfurization
Humidity of flue gas increases afterwards, and these are discharged into chimney from desulfurizing tower with saturation wet flue gas state and arrange flue gas to air, cause
Grand chimney emits white cigarette phenomenon.
The content of the invention
The present invention provides a kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system, solves current fume afterheat
Do not recycle the problem of emitting white cigarette with chimney fully.
To achieve the above object, the present invention provides following technical scheme：A kind of coal-burning power plant's heat supply initial station low temperature reclaims cigarette
Gas residual heat system, include the air preheater for being arranged at boiler flue gas outlet, gas cooler, go out with gas cooler flue gas
Mouthful connection dry electric precipitation device, connect with dry electric precipitation device exhanst gas outlet air-introduced machine, receive flue gas desulfurizing tower, and take off
The smoke re-heater of sulphur tower flue gas outlet, the chimney connected with smoke re-heater exhanst gas outlet, also include heat medium water and follow
Loop system, condensate heat-exchange system, gas bypass system, the gas bypass system are connected in parallel on boiler smoke with air preheater
Exit, the heating agent water circulation pipe are connected with shell-and-tube heat exchanger, the heating agent water circulation pipe connection gas cooler,
Smoke re-heater and shell-and-tube heat exchanger, the condensate heat exchanging pipe connect shell-and-tube heat exchanger.
Further, the gas bypass system is made up of high and low pressure gas-water heat exchanger, the heat exchange of high pressure gas-water
Device come heating part high-pressure feed water, and then is squeezed the middle and high cylinder pressure of steam turbine and drawn gas using the fume afterheat of absorption；Low pressure flue gas-
Water- to-water heat exchanger come heating part low pressure condensate water, and then is squeezed turbine low pressure cylinder and drawn gas using the fume afterheat of absorption.
Further, the heat medium water is demineralized water, connects expansion tank on the heating agent water circulation pipe, demineralized water leads to
Cross expansion tank supply heating agent water circulation pipe.
Further, the gas bypass system is made up of high and low pressure gas-water heat exchanger, high pressure gas-water heat exchanger
Using the fume afterheat of absorption come heating part high-pressure feed water, and then squeeze No. 1 high pressure cylinder in steam turbine and draw gas；Low pressure flue gas-
Water- to-water heat exchanger come heating part low pressure condensate water, and then is squeezed No. 2 low pressure (LP) cylinders of steam turbine and drawn gas using the fume afterheat of absorption.
Further, the smoke re-heater includes nearly dew point water temperature control module, the nearly dew point water temperature control mould
Heat medium water flow proportional in block regulation heating agent water circulation pipe, so as to control the inlet water temperature into chimney to be not less than acid dew point.
The beneficial effects of the invention are as follows：
The present invention compared with prior art, not only squeeze turbine low pressure cylinder and draw gas, and can also squeeze steam turbine mesohigh by the system
Cylinder steam discharge, the cigarette Wen Genggao, waste heat grade residing for its flue gas utilized are higher, have in terms of unit efficiency is lifted further
Improve.The present invention sets heating agent water circulation pipe purpose to be to eliminate chimney " Bai Long ", while can extend making for chimney lining
Use the life-span.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the implementation with invention
Example is used to explain the present invention together, is not construed as limiting the invention.
In the accompanying drawings：
Fig. 1 is a kind of structural representation of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system of the present invention.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein preferred real
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Refering to Fig. 1, a kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system, include and be arranged at boiler smoke
The air preheater 4 of outlet, gas cooler 101, the dry electric precipitation device 5 connected with the exhanst gas outlet of gas cooler 101, with
The air-introduced machine 6 of the exhanst gas outlet of dry electric precipitation device 5 connection, receive the desulfurizing tower 7 of flue gas, connect with the exhanst gas outlet of desulfurizing tower 7
Smoke re-heater 102, the chimney 8 connected with the exhanst gas outlet of smoke re-heater 102, also include heating agent water circulation system 1, condense
Water heat-exchange system 2, gas bypass system 3, the gas bypass system 3 are connected in parallel at boiler flue gas outlet with air preheater 4,
The heating agent water circulation pipe is connected with shell-and-tube heat exchanger 201, the heating agent water circulation pipe connection gas cooler 101,
Smoke re-heater 102 and shell-and-tube heat exchanger 201, the heat medium water are demineralized water, are connected on the heating agent water circulation pipe swollen
Swollen water tank 103, demineralized water supply heating agent water circulation pipe by expansion tank 103, and the condensate heat exchanging pipe connects shell
Formula heat exchanger 201,
The gas bypass system 3 is made up of high and low pressure gas-water heat exchanger, and high pressure gas-water heat exchanger 301 utilizes absorption
Fume afterheat carry out heating part high-pressure feed water, and then squeeze No. 1 high pressure cylinder 303 in steam turbine and draw gas；Low pressure gas-water exchanges heat
Device 302 come heating part low pressure condensate water, and then is squeezed No. 2 low pressure (LP) cylinders of steam turbine and draws gas 304 using the fume afterheat of absorption.
In one embodiment, high and low pressure gas-water heat exchanger 301,302, gas cooler material 101 are along flue gas direction
From 20G and ND steel, usage ratio respectively accounts for 50%, and the material of smoke re-heater 102 selects SMO254 two-phases respectively along flue gas direction
Stainless steel, 316 L and ND steel, the row of SMO254 naked pipes 6, flue gas are promoted to more than water dew point, and reserved 1 exhaust amount.
In another embodiment, the smoke re-heater 102 includes nearly dew point water temperature control module, the nearly dew point water
Heat medium water flow proportional in warm control module regulation heating agent water circulation pipe, so as to control the inlet water temperature into chimney to be not less than
Acid dew point.
The present invention operation principle be：
Temperature in gas bypass system 3 residing for 13% flue gas is 370~150 DEG C, and this partial fume waste heat is disposed in flue gas
High and low pressure gas-water heat exchanger 301,302 in bypass utilizes.High pressure gas-water heat exchanger can utilize temperature be 370~
240 DEG C of fume afterheat, drawn gas for heating part high-pressure feed water exclusion intermediate pressure cylinder；Low pressure gas-water heat exchanger can utilize temperature
The fume afterheat for 240~150 DEG C is spent, is drawn gas for heating part low pressure condensate water exclusion low pressure (LP) cylinder.
The entrance of dry electric precipitation device 5 set gas cooler 101,68~70 DEG C of heat medium water inflow temperature, by flue gas from
150 DEG C are down to 85 DEG C, and water temperature rises to 105~108 DEG C after heat medium water heat absorption；In chimney entrance, smoke re-heater 102, high temperature are set
Outlet cigarette temperature in absorption tower is heated to 72 DEG C to eliminate white cigarette phenomenon by heat medium water by 46 DEG C, and heating agent coolant-temperature gage is reduced to 85 DEG C；If
Put shell-and-tube heat exchanger 201 and import heating agent water temperature is reduced to 68~70 DEG C by 85 DEG C, No. 1 low pressure is back to after condensate heating
Cylinder 202.
Finally it should be noted that：The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, to the greatest extent
The present invention is described in detail with reference to the foregoing embodiments for pipe, and for those skilled in the art, it still can be with
Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (5)
1. a kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system, it is characterised in that include and be arranged at boiler smoke
The air preheater of gas outlet（4）, gas cooler（101）With gas cooler（101）The dry type electricity of exhanst gas outlet connection removes
Dirt device（5）And dry electric precipitation device（5）The air-introduced machine of exhanst gas outlet connection（6）, receive flue gas desulfurizing tower（7）With desulfurizing tower
（7）The smoke re-heater of exhanst gas outlet connection（102）With smoke re-heater（102）The chimney of exhanst gas outlet connection（8）, also wrap
Heating agent water circulation system is included（1）, condensate heat-exchange system（2）, gas bypass system（3）, the gas bypass system（3）With
Air preheater（4）It is connected in parallel at boiler flue gas outlet, the heating agent water circulation pipe is connected with shell-and-tube heat exchanger（201）,
The heating agent water circulation pipe connects gas cooler（101）, smoke re-heater（102）And shell-and-tube heat exchanger（201）, it is described
Condensate heat exchanging pipe connects shell-and-tube heat exchanger（201）.
A kind of 2. coal-burning power plant's heat supply initial station low temperature Mist heat recovering system according to claim 1, it is characterised in that
The heat medium water is demineralized water, and expansion tank is connected on the heating agent water circulation pipe（103）, demineralized water passes through expansion tank
（103）Supply heating agent water circulation pipe.
A kind of 3. coal-burning power plant's heat supply initial station low temperature Mist heat recovering system according to claim 1, it is characterised in that
The gas bypass system（3）It is made up of high and low pressure gas-water heat exchanger, high pressure gas-water heat exchanger（301）Utilize absorption
Fume afterheat carry out heating part high-pressure feed water, and then squeeze No. 1 high pressure cylinder in steam turbine（303）Draw gas；Low pressure gas-water changes
Hot device（302）Using the fume afterheat of absorption come heating part low pressure condensate water, and then squeeze No. 2 low pressure (LP) cylinders of steam turbine and draw gas
（304）.
A kind of 4. coal-burning power plant's heat supply initial station low temperature Mist heat recovering system according to claim 1, it is characterised in that
The high and low pressure gas-water heat exchanger（301）、（302）, gas cooler material（101）20G and ND is selected along flue gas direction
Steel, usage ratio respectively account for 50%, smoke re-heater（102）Material is along flue gas direction respectively from SMO254 two phase stainless steels, 316
L and ND steel, the row of SMO254 naked pipes 6, flue gas are promoted to more than water dew point, and reserved 1 exhaust amount.
A kind of 5. coal-burning power plant's heat supply initial station low temperature Mist heat recovering system according to claim 1, it is characterised in that
The smoke re-heater（102）Include nearly dew point water temperature control module, the nearly dew point water temperature control module regulation heat medium water
Heat medium water flow proportional in circulation line, so as to control the inlet water temperature into chimney to be not less than acid dew point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710777927.XA CN107631289A (en) | 2017-09-01 | 2017-09-01 | A kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710777927.XA CN107631289A (en) | 2017-09-01 | 2017-09-01 | A kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system |
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| CN107631289A true CN107631289A (en) | 2018-01-26 |
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| CN201710777927.XA Pending CN107631289A (en) | 2017-09-01 | 2017-09-01 | A kind of coal-burning power plant's heat supply initial station low temperature Mist heat recovering system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726153A (en) * | 2019-09-27 | 2020-01-24 | 华电电力科学研究院有限公司 | Coal-fired power plant flue gas whitening elimination system and method |
Citations (4)
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|---|---|---|---|---|
| CN103574630A (en) * | 2012-07-19 | 2014-02-12 | 中国电力工程顾问集团华东电力设计院 | Method for improving temperature of smoke discharged by chimney of thermal power plant, smoke heating system and thermal power generation unit |
| CN103968406A (en) * | 2014-05-13 | 2014-08-06 | 上海发电设备成套设计研究院 | Water gas smoke-smoke heat exchanging system and method capable of preventing low-temperature corrosion |
| CN106090971A (en) * | 2016-07-06 | 2016-11-09 | 大唐(北京)能源管理有限公司 | A kind of combined steam flue gas MGGH system and method |
| CN206320726U (en) * | 2016-12-16 | 2017-07-11 | 东方电气集团东方锅炉股份有限公司 | A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth |
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2017
- 2017-09-01 CN CN201710777927.XA patent/CN107631289A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574630A (en) * | 2012-07-19 | 2014-02-12 | 中国电力工程顾问集团华东电力设计院 | Method for improving temperature of smoke discharged by chimney of thermal power plant, smoke heating system and thermal power generation unit |
| CN103968406A (en) * | 2014-05-13 | 2014-08-06 | 上海发电设备成套设计研究院 | Water gas smoke-smoke heat exchanging system and method capable of preventing low-temperature corrosion |
| CN106090971A (en) * | 2016-07-06 | 2016-11-09 | 大唐(北京)能源管理有限公司 | A kind of combined steam flue gas MGGH system and method |
| CN206320726U (en) * | 2016-12-16 | 2017-07-11 | 东方电气集团东方锅炉股份有限公司 | A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726153A (en) * | 2019-09-27 | 2020-01-24 | 华电电力科学研究院有限公司 | Coal-fired power plant flue gas whitening elimination system and method |
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Application publication date: 20180126 |