CN103047675A - Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater - Google Patents
Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater Download PDFInfo
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- CN103047675A CN103047675A CN2013100160716A CN201310016071A CN103047675A CN 103047675 A CN103047675 A CN 103047675A CN 2013100160716 A CN2013100160716 A CN 2013100160716A CN 201310016071 A CN201310016071 A CN 201310016071A CN 103047675 A CN103047675 A CN 103047675A
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- temperature
- flue gas
- heating surface
- convection heating
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000003546 flue gas Substances 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002918 waste heat Substances 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 230000001172 regenerating effect Effects 0.000 claims description 24
- 230000008676 import Effects 0.000 claims description 13
- 230000033228 biological regulation Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 14
- 239000003245 coal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003416 augmentation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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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
Abstract
The invention relates to the technical field of boiler flue gas waste heat utilization, in particular to a flue gas waste heat utilization device and a method of a boiler water heat medium controlling circulating type air preheater applicable to a power station boiler with a steam drum. The device comprises a boiler water heat medium controlling circulating type air preheater and a rear flue gas channel convection heating surface. The upper portion of the boiler water heat medium controlling circulating type air preheater is connected to a falling pipe through an inlet header of the air preheater and the lower portion passing through a circulating pipe is connected to a circulating pump with a frequency converter through an outlet header of the air preheater. The rear flue gas channel convection heating surface is arranged in a perpendicular flue, the lower portion is connected to the circulating pipe through an inlet header of the convection heating surface, and the upper portion of the rear flue gas channel convection heating surface is connected to a raising pipe through an outlet header of the convection heating surface. The inlet header of the convection heating surface is provided with a thermometric indicator. An automatic control device is arranged between the thermometric indicator and the circulating pump with a frequency converter. The device can effectively improve the boiler thermal efficiency.
Description
Technical field
The present invention relates to boiler exhaust gas UTILIZATION OF VESIDUAL HEAT IN technical field, be specifically related to a kind of pot hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device and method that is applicable to the station boiler of drum.
Background technology
Heated surface at the end of boiler adopts economizer to add the version of air preheater usually, and its advantage is reheated blast when reducing heat loss due to exhaust gas, improves fire box temperature, has improved burning.But this traditional boiler tail heated structure has two drawbacks.One, air preheater are that flue gas is direct by metal heated and air-supply heat exchange, the inevitable existence because of leaking out that cold end corrosion, wearing and tearing or structure interval cause, namely affect boiler output, and causing again rousing the air inducing power consumption increases; Its two, on the one hand, because the existence of cold end corrosion, it is lower that the exhaust gas temperature of boiler can't design, heat loss due to exhaust gas can not further reduce; On the other hand, reason causes the boiler operatiopn actual exhaust gas temperature to be higher than design load far away because the variation of coal, heating surface area be large etc.At present, in order to solve the too high problem of exhaust gas temperature, people utilize the technology such as horizontal type phase-change heat exchanger, low-pressure coal saver and complex phase-change heat exchanger that heated surface at the end of boiler is transformed.Although can the decrease exhaust gas temperature after transforming, even be lower than design load, but since reduce heat that exhaust gas temperature reclaims without exception be used for heat-setting water or demineralized water, squeeze low add or oxygen-eliminating device draws gas that what enter the steam turbine acting is the lower steam of quality, available energy is very low, and it is not remarkable to cause unit efficiency to improve.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming and a kind of pot of hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device and method are provided.
Technical scheme of the present invention is achieved in that a kind of pot of hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device, this device comprises pot hydro-thermal matchmaker controlled circulation regenerative air heater and a back-end ductwork convection heating surface, pot hydro-thermal matchmaker controlled circulation regenerative air heater top links to each other with the decline conduit by air preheater import header, the bottom is connected with circulating pump with frequency converter through circulating line by the air preheater outlet header, the back-end ductwork convection heating surface is installed in the vertical flue, its underpart is connected with circulating line by convection heating surface import header, top is connected with riser duct by the convection heating surface outlet header, on the convection heating surface import header temperature instrumentation is installed, be connected with self-con-tained unit between temperature instrumentation and the circulating pump with frequency converter, the temperature signal that self-con-tained unit records by temperature instrumentation controls to adjust the revolution with the circulating pump of frequency converter.
The import and export of described circulating pump with frequency converter is separately installed with before the pump valve behind the valve and pump.
A kind of pot of method that hydro-thermal matchmaker controlled circulation regenerative air heater fume afterheat utilizes, the method may further comprise the steps:
Water in step 1, the drum, enter a pot hydro-thermal matchmaker controlled circulation regenerative air heater through the decline conduit, carry out heat exchange with air-supply after, the water exothermic temperature is reduced to the water design temperature and keeps certain safe clearance, described water design temperature is higher than flue gas acid dew point, and safe clearance is 10-15 ℃;
Temperature is increased to the air-supply design temperature after step 2, the air-supply heat absorption, and is higher even when being higher than drum water saturation temperature when the temperature of designing requirement wind, need to arrange one section by the high-temperature air preheater of flue gas;
Water after step 3, the cooling enters the back-end ductwork convection heating surface that is arranged in the back-end ductwork through circulating line by the circulating pump with frequency converter, the back-end ductwork convection heating surface absorbs flue gas heat, coolant-temperature gage wherein raises and even boiling, enters boiler-steam dome by riser duct at last;
Temperature is reduced to the flue gas set temperature value after the water heat release in the back-end ductwork convection heating surface of step 4, flue gas, enters atmosphere after dedusting, desulfurization; Described flue gas set temperature value can be only than back-end ductwork convection heating surface minimum wall temperature, namely pot hydro-thermal matchmaker controlled circulation regenerative air heater water outlet temperature high 10 ℃～15 ℃.
In the described step 3, the temperature signal that self-con-tained unit records by temperature instrumentation, control and regulation are with the revolution of the circulating pump of frequency converter, thus regulation and control water circuit flow, finally realize entering the regulation and control of back-end ductwork convection heating surface coolant-temperature gage, make it be higher than all the time flue gas acid dew point.
The invention has the beneficial effects as follows: no matter device of the present invention is air preheater or tail flue gas convection heating surface, all is the aqueous vapor heat exchange, because the coefficient of heat transfer of water side is higher than the gas side far away, just can improve whole heat transfer coefficient so only need strengthen the heat exchange of gas side.The augmentation of heat transfer of spiral fin coil, H type finned tube all has been comparatively ripe technology, has been widely used on boiler economizer, low-pressure coal saver, horizontal type phase-change heat exchanger and the complex phase-change heat exchanger, and has obtained good effect.Utilize device of the present invention, 20 ℃～40 ℃ cooling extent is arranged usually, can improve boiler thermal output 1.5%～3%.
Description of drawings
Fig. 1 is structural representation of the present invention.
The specific embodiment
A kind of pot of hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device, this device comprises pot hydro-thermal matchmaker controlled circulation regenerative air heater 1 and a back-end ductwork convection heating surface 8, pot hydro-thermal matchmaker controlled circulation regenerative air heater 1 top links to each other with decline conduit 14 by air preheater import header 13, the bottom is connected with circulating pump 5 with frequency converter through circulating line 3 by air preheater outlet header 2, back-end ductwork convection heating surface 8 is installed in the vertical flue, its underpart is connected with circulating line 3 by convection heating surface import header 7, top is connected with riser duct 10 by convection heating surface outlet header 9, on the convection heating surface import header 7 temperature instrumentation 11 is installed, be connected with self-con-tained unit 12 between temperature instrumentation 11 and the circulating pump 5 with frequency converter, the temperature signal that self-con-tained unit 12 records by temperature instrumentation 11 controls to adjust the revolution with the circulating pump 5 of frequency converter.
The import and export of described circulating pump 5 with frequency converter is separately installed with before the pump valve 6 behind the valve 4 and pump.
A kind of pot of method that hydro-thermal matchmaker controlled circulation regenerative air heater fume afterheat utilizes, the method may further comprise the steps:
Water in step 1, the drum, enter a pot hydro-thermal matchmaker controlled circulation regenerative air heater 1 through decline conduit 14, carry out heat exchange with air-supply after, the water exothermic temperature is reduced to the water design temperature and keeps certain safe clearance, described design temperature is higher than flue gas acid dew point, and safe clearance is 10-15 ℃;
Temperature is increased to the air-supply set temperature value after step 2, the air-supply heat absorption, and is higher even when being higher than drum water saturation temperature when the designing requirement wind-warm syndrome, need to arrange one section by the high-temperature air preheater of flue gas;
Described air-supply design temperature requires that according to different boiler design different wind pushing temperatures is arranged, and coal-powder boiler is generally at 300-400 ℃, and CFBB is generally at 150-220 ℃, and chain furnace is generally in 150 ℃;
Water after step 3, the cooling enters the back-end ductwork convection heating surface 8 that is arranged in the back-end ductwork through circulating line 3 by the circulating pump 5 with frequency converter, back-end ductwork convection heating surface 8 absorbs flue gas heat, coolant-temperature gage wherein raises and even boiling, enters boiler-steam dome by riser duct 10 at last;
Step 4, flue gas temperature after the water heat release is reduced to the flue gas set temperature value, enters atmosphere after dedusting, desulfurization; Described set temperature value can be only than back-end ductwork convection heating surface 8 minimum wall temperatures, namely pot hydro-thermal matchmaker controlled circulation regenerative air heater 1 water outlet temperature high 10 ℃～15 ℃.
In the described step 3, the temperature signal that self-con-tained unit 12 records by temperature instrumentation 11, control and regulation are with the revolution of the circulating pump 5 of frequency converter, thereby regulation and control water circuit flow, finally realize entering the regulation and control of back-end ductwork convection heating surface 8 coolant-temperature gages, make it be higher than all the time flue gas acid dew point.
During pot hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device operation of the present invention, can set according to flue gas acid dew point the coolant-temperature gage of back-end ductwork convection heating surface import header 7, self-con-tained unit 12 will be regulated the water circulation flow with the revolution of the circulating pump 5 of frequency converter by adjusting.The water circulation flow increases, the outlet temperature of then blowing and the inlet water temperature degree rising that enters back-end ductwork convection heating surface 8, and exhaust gas temperature also increases; Otherwise said temperature then reduces.Therefore by regulating control with the flow of the circulating pump 5 of frequency converter, can effectively regulate control back-end ductwork convection heating surface 8 minimum wall temperatures and exhaust gas temperature and be in setting range, decrease exhaust gas temperature under the prerequisite that guarantees safe operation of the boiler.Because the water of apparatus of the present invention Mist heat recovering heating turns back to again in the drum, recovery waste heat directly enters steam generator system inside, has directly improved the thermal efficiency of boiler.
Claims (4)
1. pot hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device, it is characterized in that: this device comprises pot hydro-thermal matchmaker controlled circulation regenerative air heater (1) and back-end ductwork convection heating surface (8), pot hydro-thermal matchmaker's controlled circulation regenerative air heater (1) top links to each other with decline conduit (14) by air preheater import header (13), the bottom is connected with circulating pump (5) with frequency converter through circulating line (3) by air preheater outlet header (2), back-end ductwork convection heating surface (8) is installed in the vertical flue, its underpart is connected with circulating line (3) by convection heating surface import header (7), top is connected with riser duct (10) by convection heating surface outlet header (9), temperature instrumentation (11) is installed on the convection heating surface import header (7), be connected with self-con-tained unit (12) between temperature instrumentation (11) and the circulating pump (5) with frequency converter, the temperature signal that self-con-tained unit (12) records by temperature instrumentation (11) controls to adjust the revolution with the circulating pump (5) of frequency converter.
2. pot according to claim 1 hydro-thermal matchmaker controlled circulation regenerative air heater flue gas waste heat utilization device is characterized in that: be separately installed with before the pump valve (6) behind the valve (4) and pump with the import and export of the circulating pump (5) of frequency converter.
3. the method utilized of a pot hydro-thermal matchmaker controlled circulation regenerative air heater fume afterheat, it is characterized in that: the method may further comprise the steps:
Water in step 1, the drum enters a pot hydro-thermal matchmaker controlled circulation regenerative air heater (1) through decline conduit (14), after carrying out heat exchange with air-supply, the water exothermic temperature is reduced to the water design temperature and keeps certain safe clearance, described water design temperature is higher than flue gas acid dew point, and safe clearance is 10-15 ℃;
Temperature is increased to the air-supply design temperature after step 2, the air-supply heat absorption, and is higher even when being higher than drum water saturation temperature when the temperature of designing requirement wind, need to arrange one section by the high-temperature air preheater of flue gas;
Water after step 3, the cooling enters the back-end ductwork convection heating surface (8) that is arranged in the back-end ductwork through circulating line (3) by the circulating pump (5) with frequency converter, back-end ductwork convection heating surface (8) absorbs flue gas heat, coolant-temperature gage wherein raises and even boiling, enters boiler-steam dome by riser duct (10) at last;
Temperature is reduced to the flue gas set temperature value after the water heat release in the back-end ductwork convection heating surface (8) of step 4, flue gas, enters atmosphere after dedusting, desulfurization; Described flue gas set temperature value can be only than back-end ductwork convection heating surface (8) minimum wall temperature, namely pot hydro-thermal matchmaker's controlled circulation regenerative air heater (1) water outlet temperature high 10 ℃～15 ℃.
4. the method utilized of pot according to claim 3 hydro-thermal matchmaker controlled circulation regenerative air heater fume afterheat, it is characterized in that: in the described step 3, the temperature signal that self-con-tained unit (12) records by temperature instrumentation (11), control and regulation are with the revolution of the circulating pump (5) of frequency converter, thereby regulation and control water circuit flow, finally realize entering the regulation and control of back-end ductwork convection heating surface (8) coolant-temperature gage, make it be higher than all the time flue gas acid dew point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310016071.6A CN103047675B (en) | 2013-01-17 | 2013-01-17 | Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310016071.6A CN103047675B (en) | 2013-01-17 | 2013-01-17 | Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater |
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| CN103047675B CN103047675B (en) | 2015-06-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438426A (en) * | 2013-07-26 | 2013-12-11 | 济南海普电力节能科技有限公司 | Boiler smoke gas afterheat energy-saving system for thermal power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3005848C2 (en) * | 1979-03-09 | 1987-12-10 | Kraftanlagen Ag, 6900 Heidelberg, De | |
| JPH1026486A (en) * | 1996-07-10 | 1998-01-27 | Takao Miyajima | Recovery of heat of exhaust gas by heating medium connected spiral type heat exchangers |
| CN201555208U (en) * | 2009-08-28 | 2010-08-18 | 深圳中兴科扬节能环保股份有限公司 | Flue gas waste heat recovery system |
| CN202158578U (en) * | 2011-07-19 | 2012-03-07 | 中兴能源（天津）节能服务有限公司 | Composite water circulation heat exchanger with function of exchanging heat and heating air for three times |
| CN202561794U (en) * | 2012-03-30 | 2012-11-28 | 上海阳高新能源科技有限公司 | Intelligent full-automatic air heater |
| CN203099883U (en) * | 2013-01-17 | 2013-07-31 | 张志宇 | Smoke waste heat utilization device of boiler water heating medium control and circulation type air preheater |
-
2013
- 2013-01-17 CN CN201310016071.6A patent/CN103047675B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3005848C2 (en) * | 1979-03-09 | 1987-12-10 | Kraftanlagen Ag, 6900 Heidelberg, De | |
| JPH1026486A (en) * | 1996-07-10 | 1998-01-27 | Takao Miyajima | Recovery of heat of exhaust gas by heating medium connected spiral type heat exchangers |
| CN201555208U (en) * | 2009-08-28 | 2010-08-18 | 深圳中兴科扬节能环保股份有限公司 | Flue gas waste heat recovery system |
| CN202158578U (en) * | 2011-07-19 | 2012-03-07 | 中兴能源（天津）节能服务有限公司 | Composite water circulation heat exchanger with function of exchanging heat and heating air for three times |
| CN202561794U (en) * | 2012-03-30 | 2012-11-28 | 上海阳高新能源科技有限公司 | Intelligent full-automatic air heater |
| CN203099883U (en) * | 2013-01-17 | 2013-07-31 | 张志宇 | Smoke waste heat utilization device of boiler water heating medium control and circulation type air preheater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438426A (en) * | 2013-07-26 | 2013-12-11 | 济南海普电力节能科技有限公司 | Boiler smoke gas afterheat energy-saving system for thermal power plant |
| CN103438426B (en) * | 2013-07-26 | 2015-04-08 | 山东英电节能科技有限公司 | Boiler smoke gas afterheat energy-saving system for thermal power plant |
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| CN103047675B (en) | 2015-06-17 |
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Application publication date: 20130417 Assignee: Yangzhou Xia Kang Environmental Protection Technology Co., Ltd. Assignor: Zhang Zhiyu Contract record no.: 2014320000690 Denomination of invention: Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater License type: Exclusive License Record date: 20141015 |
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Inventor after: Zhang Zhiyu Inventor after: Zhang Liuqing Inventor after: Deng Xiaojun Inventor before: Zhang Zhiyu Inventor before: Zhang Liuqing |
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Inventor after: Zhang Zhiyu Inventor after: Zhang Liuqing Inventor after: Deng Xiaojun Inventor after: Yu Changshun Inventor before: Zhang Zhiyu Inventor before: Zhang Liuqing Inventor before: Deng Xiaojun |
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Inventor after: Zhang Zhiyu Inventor after: Zhang Liuqing Inventor after: Deng Xiaojun Inventor after: Yu Changshun Inventor after: Shen Hongju Inventor before: Zhang Zhiyu Inventor before: Zhang Liuqing Inventor before: Deng Xiaojun Inventor before: Yu Changshun |
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Inventor after: Zhang Zhiyu Inventor after: Zhang Liuqing Inventor after: Deng Xiaojun Inventor after: Yu Changshun Inventor after: Shen Hongju Inventor after: Shi Xingbiao Inventor before: Zhang Zhiyu Inventor before: Zhang Liuqing Inventor before: Deng Xiaojun Inventor before: Yu Changshun Inventor before: Shen Hongju |
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Effective date of registration: 20201120 Address after: Building 2, No. 3, Fuqian Road, Hailing District, Taizhou City, Jiangsu Province Patentee after: Taizhou Haitong Asset Management Co., Ltd Address before: Xuchang City, Henan province 461000 City Road and long road intersection eight National Quality Inspection Center Room 309 Patentee before: Zhang Zhiyu |