CN203784991U - Hot air recirculating system of coal-fired boiler - Google Patents
Hot air recirculating system of coal-fired boiler Download PDFInfo
- Publication number
- CN203784991U CN203784991U CN201420186202.5U CN201420186202U CN203784991U CN 203784991 U CN203784991 U CN 203784991U CN 201420186202 U CN201420186202 U CN 201420186202U CN 203784991 U CN203784991 U CN 203784991U
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- air
- recirculating
- air duct
- hot blast
- coal
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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 discloses a hot air recirculating system of a coal-fired boiler. The hot air recirculating system of the coal-fired boiler mainly comprises an air pre-heater, a blower (a primary draught fan), a recirculating air duct, a recirculating air duct shutoff gate, a recirculating air duct adjusting valve and a cold air and hot air mixing chamber. According to the hot air recirculating system, a hot air recirculating device is additionally arranged in an outlet air duct of the air pre-heater, the hot air recirculating device is used for pumping part of hot air in an outlet of the air pre-heater, the part of hot air is induced to the front of the blower (the primary draught fan) through the recirculating air duct and is mixed with cold air pumped from the outdoor, and then the mixed air is induced to the air pre-heater. By means of the hot air recirculating system, the problem that the blast temperature in an inlet of the air pre-heater in some areas is low is solved, the ubiquitous low-temperature corrosion and ash fouling problems occurring when the air pre-heater operates normally are relieved to a large extent, and powerful guarantees are provided for safe and sable operation of a large thermal generator set under the low-temperature environment.
Description
Technical field
The utility model belongs to and prevents air preheater cold end corrosion technical field, particularly a kind of coal-burning boiler hot blast recirculating system.Be to mix with entrance cold wind by extract a part out from the hot blast of air preheater outlet specifically, to improve air preheater entrance wind-warm syndrome, its cold junction mean wall temperature improved, protection air preheater cold junction heat transfer element, mitigate corrosion and stifled ash.
Background technology
The safe operation of boiler unit is relevant with many factors, and air preheater, send the safe operation of the equipment such as (once) blower fan, deduster directly relevant with cold wind temperature.Should to cold wind temperature, certain requirement be proposed according to different fuel characteristics, different operating conditions in order to ensure the safe operation of these equipment.
The means that prevent cold end corrosion are diversified, adopt and improve cold wind temperature, to ensure that the mean wall temperature of cold junction is one of method of extensive use the most higher than acid dew-point temperature.The corrosion of preheater and stifled ash are mainly positioned at the cold junction of preheater, sometimes also can produce at intermediate layer heating surface.Therefore require cold junction mean wall temperature in service higher than recommendation, generally at least exceed 5 DEG C of left and right.Again because under boiler different load, its exhaust gas temperature is also different, thereby desired cold wind temperature is also different in the time of different boiler load, when boiler at low load (startup), exhaust gas temperature is lower, for ensureing that cold junction mean wall temperature still on recommendation, just requires higher cold wind temperature.In addition, when (once) pressure fan is during directly by outdoor air draught, the wind-warm syndrome that enters blower fan is exactly local environment temperature, in the time of the such low temperature of cold district, material and the adjusting device of blower fan are difficult to bear, in order to make the wind-warm syndrome that enters blower fan reach desired numerical value under any environment temperature, also be necessary to take measures to improve cold wind temperature, higher cold wind temperature of while also can reduce indoor cold air duct and occur low temperature dewfall phenomenon.Also have for the safe operation of electric precipitation, general provision, in the time of unit starting, just only allows input at exhaust gas temperature during higher than dew point, to avoid dewfall on the lower electric precipitation pole plate of temperature.Thereby improve the method extension device life-span that enters preheater cold wind temperature, improve equipment service condition, reduce environmental pollution and have very important significance.Generally, can be by two kinds of methods realizations of steam air heater and hot blast recirculation be set.
The advantages such as hot blast recirculating system is simple, operation is convenient, repair and maintenance workload is little and widely application, but it also has certain problem in running.For the system of installing recirculation blower, the increase of wear problem, initial cost and the operating cost of recirculation blower all makes its availability decline.In addition, the mixing inequality of recirculation hot blast and air preheater entrance cold wind also often causes pressure fan (primary air fan) operation thereafter to break down, and causes reduce its service life.
Summary of the invention
The purpose of this utility model is the existing various drawbacks of device for current raising air preheater entrance wind-warm syndrome, proposes the more rational hot blast recirculating system of one.
Described a kind of coal-burning boiler hot blast recirculating system mainly comprises air preheater (1), pressure fan (2), recirculating air duct (3), recirculating air duct cut-off gate (4), recirculating air duct control valve (5) and air mix chamber (6); Described pressure fan (2) is connected with air preheater import air channel with air mix chamber (6) respectively; Described recirculating air duct connects respectively hot-blast outlet air channel and the air mix chamber (6) of air preheater; Described air mix chamber (6) is connected with environment cold wind import (7); Described recirculating air duct cut-off gate (4) is connected with recirculating air duct control valve (5), is arranged in the air inlet place of recirculating air duct.
The air outlet of described recirculating air duct is arranged air mix chamber (6), in order to strengthen the mixed effect of hot and cold wind, in order to avoid there is top and the bottom, air channel wind-warm syndrome difference, causes the dangerous operation of pressure fan (2).
Described recirculation hot blast is sent into air mix chamber (6) by a, b, c tri-tunnels, to strengthen the mixed effect of cold-hot wind in mixing chamber.
On described recirculating air duct, be furnished with successively recirculation cut-off gate (4) and recirculation control valve (5), utilize recirculation cut-off gate (4) to increase the air channel tightness after hot blast recirculating system is stopped using, utilize recirculation control valve (5) to regulate the hot air flow entering in air mix chamber (6).
Described air mix chamber (6) is arranged in the air inlet place of pressure fan.The pressure reduction that it utilizes between air preheater outlet hot blast and pressure fan air inlet, extracts hot blast.
Native system is realized hot blast recirculation flow by the pressure differential of utilizing air preheater outlet hot blast and pressure fan (primary air fan) intake air, has saved hot blast recirculation blower, has reduced initial cost and operating cost.In addition, at the air outlet arranged cold hot air mixer of recirculating air duct, and make to recycle hot blast and send into air mix chamber by a, b, c tri-tunnels, strengthen the mixed effect of hot and cold wind with this, in order to avoid there is top and the bottom, air channel wind-warm syndrome difference, cause the dangerous operation of pressure fan (primary air fan).Demonstration by analysis, native system has larger superiority in safety in operation and economy.
Brief description of the drawings
Fig. 1 is a kind of coal-burning boiler hot blast recirculating system.
Fig. 2 is the A-A view of hot blast recirculating system part.
Number in the figure:
1-air preheater; 2-pressure fan (primary air fan); 3-recirculating air duct;
4-recirculating air duct cut-off gate; 5-recirculating air duct control valve; 6-air mix chamber;
The outdoor wind entrance of 7-.
Detailed description of the invention
The utility model proposes a kind of coal-burning boiler hot blast recirculating system.Be explained below in conjunction with accompanying drawing and example.
In a kind of coal-burning boiler hot blast recirculating system schematic diagram as shown in Figure 1, this system mainly comprises air preheater (1), pressure fan (2), recirculating air duct (3), recirculating air duct cut-off gate (4), recirculating air duct control valve (5) and air mix chamber (6).
Its principle is as follows: flow through after air mix chamber and pressure fan (primary air fan) and enter air preheater from the cold air of external environment condition, carry out heat exchange with the flue gas in air preheater, hot-air major part after intensification is delivered to pulverized coal preparation system or burner hearth, wherein sub-fraction is sent air mix chamber back to via recirculating air duct, mix with the cold air from external environment condition, improve the air themperature of air blower inlet, then send in air preheater via pressure fan.Be located in the north, winter environment temperature compared with for low thermal power plant for part, as long as choose rational recirculation air quantity, just can ensure that the entrance wind-warm syndrome of air preheater meets design requirement.
In the time of boiler load or variation of ambient temperature, can regulate recirculation air quantity by recirculating air duct control valve, and then guarantee that air preheater entrance wind-warm syndrome is stable.In the time that ambient temperature raises, close gradually recirculating air duct control valve, reduce the recirculation air quantity entering in air mix chamber, until ambient temperature can meet the requirement of air preheater entrance wind-warm syndrome completely.
Claims (5)
1. a coal-burning boiler hot blast recirculating system, it is characterized in that, this system mainly comprises air preheater (1), pressure fan (2), recirculating air duct (3), recirculating air duct cut-off gate (4), recirculating air duct control valve (5) and air mix chamber (6); Described pressure fan (2) is connected with air preheater import air channel with air mix chamber (6) respectively; Described recirculating air duct connects respectively hot-blast outlet air channel and the air mix chamber (6) of air preheater; Described air mix chamber (6) is connected with environment cold wind import (7); Described recirculating air duct cut-off gate (4) is connected with recirculating air duct control valve (5), is arranged in the air inlet place of recirculating air duct.
2. a kind of coal-burning boiler hot blast recirculating system according to claim 1, it is characterized in that: the air outlet at recirculating air duct is arranged air mix chamber (6), in order to strengthen the mixed effect of hot and cold wind, in order to avoid there is top and the bottom, air channel wind-warm syndrome difference, cause the dangerous operation of pressure fan (2).
3. a kind of coal-burning boiler hot blast recirculating system according to claim 1, is characterized in that: recirculation hot blast is sent into air mix chamber (6) by a, b, c tri-tunnels, to strengthen the mixed effect of cold-hot wind in mixing chamber.
4. a kind of coal-burning boiler hot blast recirculating system according to claim 1, it is characterized in that: on recirculating air duct, be furnished with successively recirculation cut-off gate (4) and recirculation control valve (5), utilize recirculation cut-off gate (4) to increase the air channel tightness after hot blast recirculating system is stopped using, utilize recirculation control valve (5) to regulate the hot air flow entering in air mix chamber (6).
5. a kind of coal-burning boiler hot blast recirculating system according to claim 1, is characterized in that: air mix chamber (6) is arranged in the air inlet place of pressure fan, and the pressure reduction that it utilizes between air preheater outlet hot blast and pressure fan air inlet, extracts hot blast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420186202.5U CN203784991U (en) | 2014-04-17 | 2014-04-17 | Hot air recirculating system of coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420186202.5U CN203784991U (en) | 2014-04-17 | 2014-04-17 | Hot air recirculating system of coal-fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203784991U true CN203784991U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420186202.5U Expired - Fee Related CN203784991U (en) | 2014-04-17 | 2014-04-17 | Hot air recirculating system of coal-fired boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN203784991U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526599A (en) * | 2016-01-26 | 2016-04-27 | 华北电力大学 | Clean type coal-fired boiler smoke discharging waste heat quality improving using system |
| CN105937850A (en) * | 2016-06-04 | 2016-09-14 | 安徽都灵精密机械有限公司 | Automatic thermoregulator device of grain drier |
| CN106402838A (en) * | 2016-09-13 | 2017-02-15 | 上海理工大学 | Tail flue gas waste heat utilizing system of utility boiler based on hot blast recycling |
| CN106482088A (en) * | 2016-09-13 | 2017-03-08 | 上海理工大学 | Joint thermal wind sensor utilizes system with the residual heat from boiler fume of steam air heater |
| CN113803706A (en) * | 2021-09-23 | 2021-12-17 | 上海理工大学 | Power generation system based on hot air recycling utilizes boiler afterbody flue gas waste heat |
-
2014
- 2014-04-17 CN CN201420186202.5U patent/CN203784991U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526599A (en) * | 2016-01-26 | 2016-04-27 | 华北电力大学 | Clean type coal-fired boiler smoke discharging waste heat quality improving using system |
| CN105526599B (en) * | 2016-01-26 | 2018-05-25 | 华北电力大学 | The upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system |
| CN105937850A (en) * | 2016-06-04 | 2016-09-14 | 安徽都灵精密机械有限公司 | Automatic thermoregulator device of grain drier |
| CN106402838A (en) * | 2016-09-13 | 2017-02-15 | 上海理工大学 | Tail flue gas waste heat utilizing system of utility boiler based on hot blast recycling |
| CN106482088A (en) * | 2016-09-13 | 2017-03-08 | 上海理工大学 | Joint thermal wind sensor utilizes system with the residual heat from boiler fume of steam air heater |
| CN113803706A (en) * | 2021-09-23 | 2021-12-17 | 上海理工大学 | Power generation system based on hot air recycling utilizes boiler afterbody flue gas waste heat |
| CN113803706B (en) * | 2021-09-23 | 2024-04-19 | 上海理工大学 | Power generation system based on hot air recycling and utilizing waste heat of tail flue gas of boiler |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20150417 |
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| EXPY | Termination of patent right or utility model |