CN203375432U - Protective device of low-temperature heating surface at tail of boiler - Google Patents
Protective device of low-temperature heating surface at tail of boiler Download PDFInfo
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- CN203375432U CN203375432U CN201320333675.9U CN201320333675U CN203375432U CN 203375432 U CN203375432 U CN 203375432U CN 201320333675 U CN201320333675 U CN 201320333675U CN 203375432 U CN203375432 U CN 203375432U
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- gas cooler
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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 utility model relates to a protective device of a low-temperature heating surface at the tail of a boiler. The protective device comprises a primary air high-temperature section air preheater vertically arranged in a flue, a flue gas cooler, a primary air low-temperature section air preheater arranged on the external of the flue, a start-up boiler water supply tank and a deaerator. The input end of the primary air high-temperature section air preheater is connected with the output end of the primary air low-temperature section air preheater, the heating working medium input end of the primary air low-temperature section air preheater is respectively connected with the cooling medium condensation water output end of the flue gas cooler, the start-up boiler water supply tank, the deaerator and a start-up boiler steam leading-out pipe through pipelines, and each pipeline is provided with a valve; the output end of the flue gas cooler is connected with the input end of the primary air low-temperature section air preheater through an output pipeline, and a condensation water pipe and the output pipe are respectively provided with a valve. According to the protective device, the outer wall of the low-temperature section of the boiler air preheater can be protected against condensation, corrosion and ash fouling, and thus the service life of the boiler is prolonged.
Description
Technical field
The utility model relates to a kind of protector, especially relates to the protector of boiler tail low temperature heating surface.
Background technology
At present, during the power plant fuel large at these moisture contents of biomass burning, rubbish and burning mixed mud, the flue gas produced, its water content is also larger, while running into the large heat transfer medium of thermal resistance in the process of smoke evacuation, steam in flue gas more easily condenses into dew on the low temperature tube wall, and for a long time condensation makes on the heating surface tube wall of flue afterbody and produces corrosion.In order to prevent that flue gas from producing condensation corrosion air flue equipment heating surface piping, prior art as shown in Figure 1, economizer 11, wind high temperature section air preheater 12, Secondary Air high temperature section air preheater 13, wind air reheater 14 and a Secondary Air air reheater 15, all be placed in flue 1.Adopt the mode of flue gas and high temperature air heat exchange, as promote flue-gas temperature and prevent that flue gas from forming condensation corrosion flue afterbody equipment heating surface at the flue afterbody, it is too high that this mode will make flue afterbody exhaust gas temperature, the outer surface corrosion that can make to be arranged on the air preheater of exhaust opening leaks, and produces potential safety hazard.The situations such as stifled ash easily occur, impact is conducted heat, and has increased the operation and maintenance cost of boiler, both dangerous, also not environmental protection simultaneously.
Therefore study the characteristics of heated surface at the end of boiler cold end corrosion, the boiler tail structure of development of new, meet boiler safety, economical operation requirement, and economy of power plant, safe operation, have great significance to economic development and environmental protection.
Summary of the invention
The utility model is the protective device of a kind of boiler tail flue gas side heating surface anti-low-temperature corrosion provided in order to overcome the problems referred to above that prior art exists.
The purpose of this utility model can be achieved through the following technical solutions: the protector of boiler tail low temperature heating surface, described boiler tail comprises flue, be characterized in, described protector is included in a wind high temperature section air preheater and a gas cooler setting up and down in described flue, also comprises: startup boiler feedwater case and an oxygen-eliminating device that is arranged on wind air reheater of described flue outer front end and is arranged on described flue outer-rear end;
The input of a described wind high temperature section air preheater is connected with the output of a wind air reheater, the heating working medium input of a described wind air reheater is connected with startup boiler feedwater case, oxygen-eliminating device, startup boiler, gas cooler condensate water output respectively by pipeline, and each described pipeline is equipped with valve;
Described gas cooler condensate water input is connected with the condensate pipe of Steam Turbine Regenerative System, and gas cooler condensate water output is connected with the input of a described wind air reheater respectively by output channel; Described condensate pipe, output channel all are provided with valve.
The protector of above-mentioned boiler tail low temperature heating surface, wherein, also comprise a Secondary Air high temperature section air preheater and a Secondary Air air reheater;
Described Secondary Air high temperature section air preheater is arranged in flue, between a described wind high temperature section air preheater, gas cooler;
Described Secondary Air air reheater is arranged on described flue outer front end, described Secondary Air high temperature section air preheater is connected with the Secondary Air air reheater, the input of described Secondary Air air reheater heating working medium is connected with oxygen-eliminating device, gas cooler condensate water output respectively by pipeline, and described pipeline is equipped with valve.
The protector of above-mentioned boiler tail low temperature heating surface, wherein, the protector of described boiler tail low temperature heating surface also is provided with a condensate water bypass duct, described condensate water bypass duct one end is connected with Steam Turbine Regenerative System by pipeline, the other end is connected with the pipeline of the output end of gas cooler by above-mentioned pipeline, and described pipeline is equipped with valve.
The protector of above-mentioned boiler tail low temperature heating surface, wherein, a described wind air reheater, Secondary Air air reheater are heat pipe-type water-air heat exchanger.
The protector of above-mentioned boiler tail low temperature heating surface, wherein, described gas cooler is heat-pipe type cooling apparatus, and the heat exchanger tube of this heat-pipe type cooling apparatus is all by the adverse current in-line arrangement, and outer wall is smooth.
Because the utility model has adopted above technical scheme, the technique effect of its generation is obvious:
1, due to will be once, the secondary air reheater is arranged on outside flue, outside heated working medium is the air of low temperature, inside is condensate water or other the inferior clean waters after the gas cooler heat absorption, air reheater or (with) complete heat release in the secondary air reheater after, remove oxygen-eliminating device or start the boiler feedwater case; Cryogenic air through once, after Secondary Air air reheater heating, again enter in flue once, Secondary Air high temperature section air preheater, heating again, complete heat exchange by once, secondary high-temperature section air preheater discharges flue.This device can be according to the exhaust gas temperature situation in boiler, selection is opened once simultaneously, Secondary Air low-temperature zone preheater, once, Secondary Air high temperature section preheater, or only open a wind low-temperature zone preheater and a wind high temperature section preheater, improved the operating efficiency of this protector;
2, in order to guarantee boiler efficiency, it is enough large that the utility model is arranged the heat transfer area of the heat pipe of gas cooler, and heat pipe outer wall is smooth light pipe, and by the adverse current in-line arrangement, can fully absorb waste heat, be convenient to install additional simple soot blower and can reach heat-transfer effect preferably;
3, can fundamentally prevent this type of boiler air preheater low-temperature zone outer wall generation condensation, corrosion and stifled ash, thereby avoid due to air preheater low-temperature zone corrosion, stifled ash;
4, condensate water is after the heating of a wind air preheater, and water temperature is higher, reduces the relatively high-quality steam of oxygen-eliminating device for heating, has increased and has removed industrial steam vapour, has improved the economy of power plant;
5, can reduce operating cost and repair and maintenance amount and the cost of air preheater and gas cooler, play the cost of saving station service.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art boiler tail structure.
Fig. 2 is the structural representation of a kind of embodiment of the protective device of the utility model boiler tail flue gas side heating surface anti-low-temperature corrosion.
The specific embodiment
Specific features of the present utility model and performance are further described by following embodiment and accompanying drawing thereof.
Refer to Fig. 2.The protector of boiler tail low temperature heating surface, be included in interior wind high temperature section air preheater setting up and down of flue 100 101, Secondary Air high temperature section air preheater 102, gas cooler 103, also comprise: be arranged on wind air reheater 201 of described flue outer upper ends, a Secondary Air air reheater 202, and be arranged on one of described flue 100 outsides and start boiler feedwater case and an oxygen-eliminating device;
The heating working medium input of a described wind high temperature section air preheater 101 is connected with the condensate water output of a wind air reheater 201, a described wind air reheater is connected with startup boiler feedwater case by pipeline 1, one time the wind air reheater is connected with oxygen-eliminating device by pipeline 2, one time the wind air reheater is connected with startup Boiler Steam fairlead by pipeline 3, and one time the wind air reheater is connected with the delivery trunk 7 of gas cooler 103 by pipeline 4; Described pipeline 1 is provided with the first valve 2011, and described pipeline 2 is provided with the second valve 2012, and described pipeline 3 is provided with the 3rd valve 2013, and described pipeline 4 is provided with the 4th valve 2014.
The input of described Secondary Air high temperature section air preheater 102 is connected with the output of Secondary Air air reheater 202, described Secondary Air air reheater 202 is connected with oxygen-eliminating device by pipeline 6, Secondary Air air reheater 202 is connected with the delivery trunk 7 of gas cooler 103 by pipeline 5, described pipeline 5 is provided with the 5th valve 2015, and described pipeline 6 is provided with the 6th valve 2016.
The input of described gas cooler 103 is connected with Steam Turbine Regenerative System by external condensation water pipe 9, described external condensation water pipe 9 is provided with the 7th valve 301, described external condensation water pipe 9 one sides also are provided with condensate water shunt valve 8, one end of described condensate water shunt valve 8 is connected with the gas cooler pipeline at output, described condensate water shunt valve 8 is provided with the 8th valve 302, and described gas cooler pipeline at output is provided with the 9th valve 303.
Operation principle of the present utility model is: wind, a Secondary Air air reheater are arranged on outside flue, and outside heated working medium is the air of low temperature, and inside is the condensate water after heat absorption.Condensate water is utilized gas cooler absorption boiler fume afterheat, be delivered to air reheater, outside flue, cold air is heated, condensate water after the air reheater heat release is delivered to startup boiler feedwater case or oxygen-eliminating device carries out recycling of heat, energy, and cold air becomes warm air and delivers to the high temperature section air preheater in flue after heating in air reheater, heating reaches higher design temperature again.Send into again the boiler hot air channel, enter burner hearth and participate in burning.
When boiler startup, the 8th valve 302 is opened, the 7th valve 301, the 9th valve 303 are closed, the 4th valve 2013 is opened, the 4th valve 2014 is opened, start boiler and carry out vapour heat release in wind air reheater, a cold wind is heated to more than 150 ℃ in a wind air reheater simultaneously, then enter wind high temperature section air preheater one time, the hot-air of higher temperature flue gas to lower temperature in flue carries out heat exchange, improve fast temperature in flue, thereby shortened the boiler startup time.
When boiler load is low, exhaust gas temperature is lower than 100 ℃, now the 7th valve 301, the 8th valve 302 unlatchings, the 9th valve 303 are regulated and are opened, utilize and regulate the condensing capacity that enters gas cooler, reduce the flue-gas temperature of condensate water after the caloric receptivity of gas cooler is controlled gas cooler and be not less than 100 ℃, to guarantee exhaust gas temperature, be not less than 100 ℃.
So, in the whole production process of boiler, exhaust gas temperature can be controlled at more than 100 ℃ all the time, guarantees that the interior heating surface outer wall of flue, more than 100 ℃, is unlikely to produce the condensation phenomenon, causes cold end corrosion, has shortened the boiler startup time simultaneously, has saved the energy.
This Novel practical can be used for the heated surface at the end of boiler equipment such as power plant's living beings, rubbish, burning mixed mud and prevents low-temperature corrosion protection, especially be applied in the boiler of power plant of biomass burning, secondary stock, garbage power, wherein living beings are agriculture and forestry organic waste material, wood chip, branch, leaf, the inferior material of branch and agricultural crop straw, rubbish refers to house refuse, industrial refuse, and mud refers to domestic sludge, industrial sludge etc.
Above description is further illustrating of the utility model being done in conjunction with the specific embodiment and accompanying drawing.But; the utility model obviously can be implemented with multiple other method that is different from this description; those skilled in the art can be in the situation that be promoted, deduced according to actual service condition without prejudice to the utility model content; therefore, the content of above-mentioned specific embodiment should not limit the really protection domain of regulation of the utility model.
Claims (5)
1. the protector of boiler tail low temperature heating surface, described boiler tail comprises flue, it is characterized in that, described protector is included in a wind high temperature section air preheater and a gas cooler setting up and down in described flue, also comprises: startup boiler feedwater case and an oxygen-eliminating device that is arranged on wind air reheater of described flue outer front end and is arranged on described flue outer-rear end;
The input of a described wind high temperature section air preheater is connected with the output of a wind air reheater, the heating working medium input of a described wind air reheater is connected with startup boiler feedwater case, oxygen-eliminating device, startup boiler, gas cooler condensate water output respectively by pipeline, and each described pipeline is equipped with valve;
Described gas cooler condensate water input is connected with the condensate pipe of Steam Turbine Regenerative System, and gas cooler condensate water output is connected with the input of a described wind air reheater respectively by output channel; Described condensate pipe, output channel all are provided with valve.
2. the protector of boiler tail low temperature heating surface according to claim 1, is characterized in that, also comprises a Secondary Air high temperature section air preheater and a Secondary Air air reheater;
Described Secondary Air high temperature section air preheater is arranged in flue, between a described wind high temperature section air preheater, gas cooler;
Described Secondary Air air reheater is arranged on described flue outer front end, described Secondary Air high temperature section air preheater is connected with the Secondary Air air reheater, the input of described Secondary Air air reheater heating working medium is connected with oxygen-eliminating device, gas cooler condensate water output respectively by pipeline, and described pipeline is equipped with valve.
3. the protector of boiler tail low temperature heating surface according to claim 1 and 2, it is characterized in that, the protector of described boiler tail low temperature heating surface also is provided with a condensate water bypass duct, described condensate water bypass duct one end is connected with Steam Turbine Regenerative System by pipeline, the other end is connected with the pipeline of the output end of gas cooler by above-mentioned pipeline, and described pipeline is equipped with valve.
4. the protector of boiler tail low temperature heating surface according to claim 3, is characterized in that, a described wind air reheater, Secondary Air air reheater are heat pipe-type water-air heat exchanger.
5. the protector of boiler tail low temperature heating surface according to claim 1 and 2, is characterized in that, described gas cooler is heat-pipe type cooling apparatus, and the heat exchanger tube of this heat-pipe type cooling apparatus is all by the adverse current in-line arrangement, and outer wall is smooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320333675.9U CN203375432U (en) | 2013-06-09 | 2013-06-09 | Protective device of low-temperature heating surface at tail of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320333675.9U CN203375432U (en) | 2013-06-09 | 2013-06-09 | Protective device of low-temperature heating surface at tail of boiler |
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| Publication Number | Publication Date |
|---|---|
| CN203375432U true CN203375432U (en) | 2014-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320333675.9U Expired - Lifetime CN203375432U (en) | 2013-06-09 | 2013-06-09 | Protective device of low-temperature heating surface at tail of boiler |
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| CN (1) | CN203375432U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013900A (en) * | 2017-05-22 | 2017-08-04 | 恩极而（上海）能源科技有限公司 | It is a kind of with the boiler air preheating device and its pre-heating mean that condensate is medium |
| CN112879938A (en) * | 2021-01-26 | 2021-06-01 | 东方电气集团东方汽轮机有限公司 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
| CN114251650A (en) * | 2021-12-31 | 2022-03-29 | 华中科技大学 | A biomass combustion system based on deep condensation technology and its use method |
-
2013
- 2013-06-09 CN CN201320333675.9U patent/CN203375432U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013900A (en) * | 2017-05-22 | 2017-08-04 | 恩极而（上海）能源科技有限公司 | It is a kind of with the boiler air preheating device and its pre-heating mean that condensate is medium |
| CN112879938A (en) * | 2021-01-26 | 2021-06-01 | 东方电气集团东方汽轮机有限公司 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
| CN114251650A (en) * | 2021-12-31 | 2022-03-29 | 华中科技大学 | A biomass combustion system based on deep condensation technology and its use method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140101 |
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| CX01 | Expiry of patent term |