CN1920387A - Low-pressure coal saver for boiler - Google Patents
Low-pressure coal saver for boiler Download PDFInfo
- Publication number
- CN1920387A CN1920387A CNA2006100687565A CN200610068756A CN1920387A CN 1920387 A CN1920387 A CN 1920387A CN A2006100687565 A CNA2006100687565 A CN A2006100687565A CN 200610068756 A CN200610068756 A CN 200610068756A CN 1920387 A CN1920387 A CN 1920387A
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- low
- boiler
- pressure
- coal saver
- outlet
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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
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Abstract
The invention relates to a left-heat recycle energy-saving device of boiler, wherein the low-pressure coal saver is mounted at the tail smoke channel at the outlet of air preheater, which is formed by tube beam, inlet couple bank, and outlet couple bank; the tube beam uses fin improved tube structure; the surfaces of base tube and fin are modified. The invention uses the condensed water inside the low-pressure recycle heating system to switch between high and low temperatures, while the outlet water is leaded into oxygen remover. The invention can reduce the smoke temperature and improve the cycle heat efficiency, with corrosion resistance.
Description
One, technical field
The invention belongs to boiler afterheat and reclaim energy-saving equipment, particularly a kind of low-pressure coal saver that can reduce all kinds of station boiler exhaust gas temperatures.
Two, background technology
Many boilers because a variety of causes such as the variation of burning coal, load variations, combustion system change, heating surface change etc., causes the off-design operating mode, make exhaust gas temperature off-design value to raise about 20～50 ℃ in running.Have a strong impact on the cycle efficieny in boiler efficiency and power plant like this, increased the coal consumption of boiler.The present method that solves the exhaust gas temperature rising has a variety of, can adopt the heating surface that strengthens high-pressure economizer, the measures such as heating surface that strengthen air preheater, and still, these measures often are subjected to technical or structural restriction.Strengthen the heating surface of high-pressure economizer, must cause exporting water temperature and raise, limiting value is exactly the saturation temperature in the boiler-steam dome, also is subjected to the restriction of installing space simultaneously.Strengthen the heating surface area of air preheater, must cause the rising of hot blast temperature, also be subjected to the restriction of installing space and metal heatproof intensity.
Three, summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned existing equipment technology, a kind of low-pressure coal saver that can be installed in boiler tail is provided,, reduce the exhaust gas temperature of boiler, improve the cycle efficieny in power plant with the heat energy of recovery boiler flue gas.
The present invention realizes in the following manner:
Low-pressure coal saver for boiler of the present invention, comprise economizer tube panel, heat-exchanging tube bundle, inlet header case, outlet collection case, its key problem in technology is that the inlet header case is connected by the heater of pipeline with the low pressure heat regenerative system, outlet collection case connects oxygen-eliminating device by pipeline, and low-pressure coal saver is installed on the back-end ductwork of boiler air preheater outlet.Heat-exchanging tube bundle in the economizer tube panel is spiral fin coil or longitudinal finned tube.Be provided with high temperature transfer valve and low temperature switching valve in inlet header case and the pipeline that low-pressure heater is connected.The flue gas that comes out from air preheater enters low-pressure coal saver, the heat release of outside heat exchanger tube, flowing, and the temperature of flue gas is minimized, and enters the deduster of boiler behind the outflow economizer.The condensate water that comes from low-pressure heater flows in the economizer tube, behind the heat of absorption flue gas, flows out economizer and enters oxygen-eliminating device.
The finned heat-exchanging tube bundle of economizer tube panel can be spiral fin coil or longitudinal finned tube.Pipe parent tube and fin surface are done modification and are handled, and resistance to wear and corrosion resistant ability to have.
The present invention has adopted the system at changeable water inlet water source owing to adopted finned modification pipe Pipe bundle structure, therefore can arrange more heat exchange area in limited space, reclaims the heat energy of flue gas effectively, has improved the economy of equipment.When exhaust gas temperature changes, can adjust the wall temperature of economizer tube bank, avoid taking place cold end corrosion and clogging phenomenon, improve the reliability of equipment by switching the water inlet water source.When therefore the exhaust gas temperature that causes in boiler load change, fuel band variation etc. takes place to change greatly, also can guarantee higher heat transfer efficiency, higher reliability guarantees to have higher waste heat recovery effect under various operating modes.
Four, description of drawings
Fig. 1 is a system diagram of the present invention
Fig. 2 is the structural representation of low-pressure coal saver
1 is the low-pressure coal saver tube bank among the figure, and 2 be the inlet header case, and 3 are outlet collection case, 4, be the high temperature transfer valve, and 5 is to hang down temperature switching valve.
Five, the specific embodiment
Below in conjunction with description of drawings most preferred embodiment of the present invention:
As shown in Figure 1 and Figure 2, inlet header case 2 is connected by the heater of pipeline with the low pressure heat regenerative system, and outlet collection case 3 connects oxygen-eliminating device by pipeline, and low-pressure coal saver is installed on the back-end ductwork of boiler air preheater outlet.Heat-exchanging tube bundle in the economizer tube panel is spiral fin coil or longitudinal finned tube.Be provided with high temperature transfer valve 4 and low temperature switching valve 5 in inlet header case 2 and the pipeline that low-pressure heater is connected.When the present invention worked, the pipe space outerpace that the flue gas that flows out from air preheater enters low-pressure coal saver tube bank 1 flowed, and emits heat, makes the temperature of flue gas reduce.Condensate water is drawn from the outlet of #1 low-pressure heater, enters the inlet header case 2 of low-pressure coal saver, and then flows into the pipe inner flow passage of economizer tube bank 1, absorbs the flue gas liberated heat, flows out economizer tube bank 1 and enters outlet collection case 3, flows into oxygen-eliminating device again.When the flue-gas temperature that boiler air preheater comes out was on the low side, then condensate water should switch to #2 low-pressure heater outlet and draws.Height according to flue-gas temperature, under normal condition, the condensate water that enters this low-pressure coal saver can be drawn from the outlet of #1 low-pressure heater, and condensate water is drawn from the outlet of #2 low-pressure heater when flue-gas temperature is on the low side, also can draw from these two heater outlets simultaneously.During actual motion, can optimize the ratio of two strands of water.This low-pressure coal saver is arranged in the later back-end ductwork of air preheater, can adjust wall temperature, is suitable for the bigger occasion of power condition changing, the energy recovery rate height.
Claims (3)
1. low-pressure coal saver for boiler, comprise economizer tube panel, heat-exchanging tube bundle, inlet header case, outlet collection case, it is characterized in that the inlet header case is connected by the heater of pipeline with the low pressure heat regenerative system, outlet collection case connects oxygen-eliminating device by pipeline, and low-pressure coal saver is installed on the back-end ductwork of boiler air preheater outlet.
2. low-pressure coal saver for boiler according to claim 1 is characterized in that the heat-exchanging tube bundle in the economizer tube panel is spiral fin coil or longitudinal finned tube.
3. low-pressure coal saver for boiler according to claim 1 is characterized in that being provided with high temperature transfer valve and low temperature switching valve in inlet header case and the pipeline that low-pressure heater is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100687565A CN1920387A (en) | 2006-09-05 | 2006-09-05 | Low-pressure coal saver for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100687565A CN1920387A (en) | 2006-09-05 | 2006-09-05 | Low-pressure coal saver for boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1920387A true CN1920387A (en) | 2007-02-28 |
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ID=37778170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100687565A Pending CN1920387A (en) | 2006-09-05 | 2006-09-05 | Low-pressure coal saver for boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN1920387A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586803B (en) * | 2009-04-27 | 2011-05-25 | 济南达能动力技术有限责任公司 | Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature |
| CN101629713B (en) * | 2009-08-19 | 2011-06-22 | 深圳中兴科扬节能环保股份有限公司 | Flue gas afterheat recovery system |
| CN102661600A (en) * | 2012-04-27 | 2012-09-12 | 杭州锅炉集团股份有限公司 | Clean-burning blast furnace gas boiler |
| CN102997262A (en) * | 2011-09-19 | 2013-03-27 | 上海康洪精密机械有限公司 | System for improving utilization grade of flue gas afterheat |
| CN107208888A (en) * | 2015-02-05 | 2017-09-26 | 三菱日立电力***株式会社 | The control method of heat exchanger and heat exchanger |
-
2006
- 2006-09-05 CN CNA2006100687565A patent/CN1920387A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586803B (en) * | 2009-04-27 | 2011-05-25 | 济南达能动力技术有限责任公司 | Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature |
| CN101629713B (en) * | 2009-08-19 | 2011-06-22 | 深圳中兴科扬节能环保股份有限公司 | Flue gas afterheat recovery system |
| CN102997262A (en) * | 2011-09-19 | 2013-03-27 | 上海康洪精密机械有限公司 | System for improving utilization grade of flue gas afterheat |
| CN102661600A (en) * | 2012-04-27 | 2012-09-12 | 杭州锅炉集团股份有限公司 | Clean-burning blast furnace gas boiler |
| CN107208888A (en) * | 2015-02-05 | 2017-09-26 | 三菱日立电力***株式会社 | The control method of heat exchanger and heat exchanger |
| CN107208888B (en) * | 2015-02-05 | 2022-01-07 | 三菱动力株式会社 | Heat exchanger and method for controlling heat exchanger |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20070228 |