CN201819198U - High and low pressure combined-type economizer - Google Patents
High and low pressure combined-type economizer Download PDFInfo
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- CN201819198U CN201819198U CN2010205575252U CN201020557525U CN201819198U CN 201819198 U CN201819198 U CN 201819198U CN 2010205575252 U CN2010205575252 U CN 2010205575252U CN 201020557525 U CN201020557525 U CN 201020557525U CN 201819198 U CN201819198 U CN 201819198U
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Abstract
The utility model provides a high and low pressure combined-type economizer. The combined-type economizer comprises a first high pressure economizer, an air pre-heater, a low pressure economizer, and a second high pressure economizer, wherein the first high pressure economizer, the air pre-heater and the low pressure economizer are arranged in a flue duct in the flue gas flowing direction sequentially; the second high pressure economizer is connected in series with the first high pressure economizer, and is connected with a boiler water feeding system; the low pressure economizer is connected with a heat exchanger; and a boiler air supply system is connected with the air pre-heater through the heat exchanger. The high and low pressure combined-type economizer provided by the utility model has the advantages that waste heat utilization ratio of flue gas is improved; the recovering and circulation efficiency is accelerated; and acid dew corrosion on equipment caused by the flue gas can be avoided.
Description
Technical field
The utility model relates to the residual heat from boiler fume recovery technology, particularly a kind of high high-low pressure combined type economizer of cycle efficieny that reclaims.
Background technology
Be typically provided with economizer and air preheater in the boiler flue, the absorption portion fume afterheat reduces exhaust gas temperature.Yet because SO in the boiler smoke
3Existence, the exhanst gas outlet temperature of air preheater back-end surfaces is restricted, exhaust gas temperature is crossed to hang down and can be caused the wall temperature of heating surface to be lower than flue gas acid dew point and cold end corrosion and dust stratification take place, so the boiler design exhaust gas temperature is usually at 140 ℃-160 ℃ or higher.The low-pressure coal saver technology is reducing the popular welcome that is subjected to domestic power plant on the exhaust gas temperature, low-pressure coal saver is installed in the boiler back end ductwork, utilize low-pressure heater in the Steam Turbine Regenerative System to add the condensate water of hot water side but not high-pressure feed water comes cooled flue gas, its heat transfer boundary condition is similar to economizer, but the pressure of water side is well below the pressure of economizer, so claim its low-pressure coal saver.The installation of low-pressure coal saver makes the steam turbine heat-exchange system obtain a heat credit, has saved a part and has bled, and well reclaims heat loss due to exhaust gas, has improved the thermal efficiency of full factory.
Yet compare with high-pressure economizer, low-pressure coal saver is poor slightly on the using energy source grade.After using low-pressure coal saver, when condensing water temperature raises, the backheat rate of air sucked in required is reduced, the condensation component that enters condenser increases, thereby has increased the steam discharge heat loss, has reduced cycle efficieny.
The utility model content
Problem to be solved in the utility model provides the high high-low pressure combined type economizer of a kind of fume afterheat utilization rate, overcomes the above-mentioned problems in the prior art.
A kind of high-low pressure combined type of the utility model economizer, comprise by the flue gas direction of flowing through and be located at first high-pressure economizer, air preheater and low-pressure coal saver in the flue successively, also comprise second high-pressure economizer of connecting with described first high-pressure economizer, second high-pressure economizer links to each other with the feed water system of boiler; Described low-pressure coal saver links to each other with a heat exchanger, and the boiler supply air system links to each other with air preheater by described heat exchanger.
The inlet header case of first high-pressure economizer described in the utility model links to each other with the outlet collection case of described second high-pressure economizer, the outlet collection case of described first high-pressure economizer links to each other with boiler-steam dome, and the inlet header case of described second high-pressure economizer links to each other with the described feed water system of boiler.
The second high-pressure economizer inlet header case described in the utility model and the first high-pressure economizer inlet header case are formed by a control valve and regulate bypass.
The utility model also comprises an automatic control system, links to each other with described control valve.
Low-pressure coal saver described in the utility model is provided with a temperature sensor, and temperature sensor links to each other with described automatic control system.
By above technical scheme, with respect to traditional low-pressure coal saver cooling space is this section flue gas behind the air preheater, and the cooling space of the utility model high-low pressure combined type economizer is high-pressure economizer and this section of air preheater flue gas, utilize second high-pressure economizer to absorb heat the heating boiler feedwater, and low-pressure coal saver comes the heating boiler air-supply to prevent the acid corrosion of air preheater, therefore the utility model reclaims the grade of heat than traditional high-low pressure economizer height, the heat that absorbs is participated in interior circulation directly, so efficient also wants high than traditional high-low pressure economizer.
Description of drawings
Fig. 1 is the structural representation of a kind of high-low pressure combined type economizer of the present utility model
The specific embodiment
As shown in Figure 1, a kind of high-low pressure combined type of the utility model economizer, comprise by the flue gas direction of flowing through and be located at first high-pressure economizer 2, air preheater 5 and low-pressure coal saver 9 in the flue 1 successively, also comprise second high-pressure economizer 3 of connecting with first high-pressure economizer 2, the inlet header case of first high-pressure economizer 2 links to each other with the outlet collection case of second high-pressure economizer 3, the outlet collection case of first high-pressure economizer 2 links to each other with boiler-steam dome, and the inlet header case of second high-pressure economizer links to each other with the feed water system of boiler 11.Accelerated the utilization rate of fume afterheat and improved heating-up temperature by the series connection of two high-pressure economizers boiler feedwater.Low-pressure coal saver 9 links to each other with heat exchanger 7 by a circulating pump 8, the boiler supply air system is blown to heat exchanger 7, heat exchanger 7 links to each other with air preheater 5, air utilizes low-pressure coal saver to absorb next heat heating by heat exchanger earlier, enter air preheater 5 again, the import wind-warm syndrome of air preheater has improved like this, has reduced corrosivity is revealed in the acid of air preheater.
The inlet header case of the inlet header case of first high-pressure economizer 2 and first high-pressure economizer 3 forms by control valve 4 and regulates bypass, control valve 4 links to each other with the feed water system of boiler 11, regulate the caloric receptivity of high-pressure economizer by this control valve 4, thereby change the entrance flue gas temperature that enters air preheater 5.Low-pressure coal saver 9 is provided with the wall temperature that a temperature sensor 10 is measured low-pressure coal saver, also comprise an automatic control system 6, link to each other with control valve 4 with temperature sensor 10, this temperature sensor 10 is passed to automatic control system 6 to the temperature of surveying, and can control to adjust the caloric receptivity that valve 4 reduces high-pressure economizer when automatic control system 6 receives the low signal of low-pressure coal saver wall temperature.
Flue gas passes through first high-pressure economizer, 2, the second high-pressure economizers 3 in the boiler back end ductwork 1 successively, air preheater 5, low-pressure coal saver 9 and to its heat release.The heat that first high-pressure economizer 2 and second high-pressure economizer 3 absorb is directly passed to the feed water system of boiler 11; because absorbing heat, two high-pressure economizers must make the cigarette temperature drop that enters air preheater 5 low; change the heat transfer structure of air preheater 5; the reduction of cigarette temperature may cause the acid of air preheat equipment back-end surfaces to reveal corrosion; low-pressure coal saver 9 is used for heating boiler air-supply and can remedies this defective well, the protection air preheater for this reason.The boiler air-supply rises to 50 ℃～60 ℃ by heat exchanger 7 heat absorption back temperature and enters air preheater 5.Because air preheat equipment importation wind-warm syndrome has improved 30 ℃～40 ℃, make its lowermost wall surface temperature improve more than 20 ℃, away from flue gas acid dew point.The feed water system of boiler 11 feedwater at first enter second high-pressure economizer 3, enter first high-pressure economizer 2 then, directly enter first high-pressure economizer and do not enter second high-pressure economizer by electric control valve 4 adjustable water savings, thereby change the entrance flue gas temperature that enters air preheat equipment 5.The heat transfer temperature and pressure of low-pressure coal saver 9 change like this, heat output also changes thereupon, break original thermal balance, low-pressure coal saver regulates wall surface temperature automatically and exhaust gas temperature is set up new heat transfer balance, thereby realize the controllable of wall temperature and exhaust gas temperature, to adapt to acid dew point variation that boiler oil or load variations bring requirement to the lowermost wall surface temperature.
Claims (5)
1. high-low pressure combined type economizer, comprise by the flue gas direction of flowing through and be located at first high-pressure economizer, air preheater and low-pressure coal saver in the flue successively, it is characterized in that, also comprise second high-pressure economizer of connecting with described first high-pressure economizer, second high-pressure economizer links to each other with the feed water system of boiler; Described low-pressure coal saver links to each other with a heat exchanger, and the boiler supply air system links to each other with air preheater by described heat exchanger.
2. high-low pressure combined type economizer according to claim 1, it is characterized in that, the inlet header case of described first high-pressure economizer links to each other with the outlet collection case of described second high-pressure economizer, the outlet collection case of described first high-pressure economizer links to each other with boiler-steam dome, and the inlet header case of described second high-pressure economizer links to each other with the described feed water system of boiler.
3. high-low pressure combined type economizer according to claim 2 is characterized in that, the described second high-pressure economizer inlet header case and the first high-pressure economizer inlet header case are formed by a control valve and regulate bypass.
4. high-low pressure combined type economizer according to claim 3 is characterized in that, also comprises an automatic control system, links to each other with described control valve.
5. high-low pressure combined type economizer according to claim 4 is characterized in that described low-pressure coal saver is provided with a temperature sensor, and temperature sensor links to each other with described automatic control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205575252U CN201819198U (en) | 2010-10-12 | 2010-10-12 | High and low pressure combined-type economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205575252U CN201819198U (en) | 2010-10-12 | 2010-10-12 | High and low pressure combined-type economizer |
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| Publication Number | Publication Date |
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| CN201819198U true CN201819198U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205575252U Expired - Fee Related CN201819198U (en) | 2010-10-12 | 2010-10-12 | High and low pressure combined-type economizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175188A (en) * | 2011-12-20 | 2013-06-26 | 上海康洪精密机械有限公司 | Closed circulation type coaleconomizer |
| CN103307592A (en) * | 2012-03-16 | 2013-09-18 | 尹华雷 | Low-pressure coal economizer coated by walls of boiler tail flue |
| CN113465423A (en) * | 2020-07-23 | 2021-10-01 | 中北大学 | Flue gas monitoring heat pipe system |
-
2010
- 2010-10-12 CN CN2010205575252U patent/CN201819198U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175188A (en) * | 2011-12-20 | 2013-06-26 | 上海康洪精密机械有限公司 | Closed circulation type coaleconomizer |
| CN103307592A (en) * | 2012-03-16 | 2013-09-18 | 尹华雷 | Low-pressure coal economizer coated by walls of boiler tail flue |
| CN113465423A (en) * | 2020-07-23 | 2021-10-01 | 中北大学 | Flue gas monitoring heat pipe system |
| CN113465423B (en) * | 2020-07-23 | 2022-04-15 | 中北大学 | Flue gas monitoring heat pipe system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 201107 Shanghai, Minhang District Exhibition Road, No. first, No. 1, building 58, B District Patentee after: Shanghai Fubo Environmental Protection Equipment Co., Ltd. Address before: 201204 Shanghai City, Pudong New Area Road No. 1151 Building No. 3 Lianxi 3 floor B block Patentee before: Shanghai Fubo Environmental Protection Equipment Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20181012 |
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| CF01 | Termination of patent right due to non-payment of annual fee |