CN204648289U - Separate air pre-heating system - Google Patents
Separate air pre-heating system Download PDFInfo
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- CN204648289U CN204648289U CN201520372626.5U CN201520372626U CN204648289U CN 204648289 U CN204648289 U CN 204648289U CN 201520372626 U CN201520372626 U CN 201520372626U CN 204648289 U CN204648289 U CN 204648289U
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- air
- preheater
- air preheater
- burner hearth
- 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
Abstract
The utility model discloses separate air pre-heating system, wherein First air air preheater is separated setting with air preheater of secondary air; The output of coal-grinding unit is connected with burner hearth by pulverized coal channel, and the flue gas output of burner hearth is connected with the heat smoke input of First air air preheater by gas cooler; The flue gas output of burner hearth is also connected with the heat smoke input of two air preheater of secondary airs; The cold Secondary Air input of air preheater of secondary air is connected with pressure fan; The hot Secondary Air output of air preheater of secondary air is connected with burner hearth; The cold First air input of First air air preheater is connected with primary air fan.First air and air preheater of secondary air outlet can be provided separately according to most suitable wind-warm syndrome; And regulated by the condensing capacity that flows through gas cooler or confluent, thus avoid as regulating heat primary air temperature and exhaust gas temperature that a large amount of blending cold wind causes rises, the problem of boiler efficiency decline.
Description
Technical field
The utility model relates to thermal power generation, and more particularly it is a kind of separate air pre-heating system.
Background technology
Rotary regenerative air preheater is the important auxiliary equipment in thermal power plant, it is the heat-exchange apparatus utilizing the waste heat of flue gas to carry out heating boiler burning required air, present large-scale power station pulverized-coal fired boiler usually every platform boiler adopts 2 trisector air heaters, and every platform air preheater is divided into flue gas district, First air district and region, three, Secondary Air district at circumferencial direction.Wherein the hot-air (heat primary air) of First air district heating is as the medium of pulverized coal conveying, for unit pulverized-coal system, also plays mill coal drying and logical wind action; The hot-air (hot Secondary Air) of Secondary Air district heating is as the oxygen required for coal dust firing and after-flame.
Due to heat primary air and hot Secondary Air difference functionally, the temperature therefore required is not identical yet, and the factor affecting wind-warm syndrome is also different.Heat primary air temperature is the different types according to pulverized coal preparation system and the different requirements to desiccant temperature, and prevent coal dust from condensing, explode, coal pulverizer bearing allowable temperature and coal dust catch fire in burner hearth and smooth combustion determines.According to the difference of coal, the wind-warm syndrome that pulverized coal preparation system requires is generally between 200 ~ 300 DEG C, and when the coal varitation burnt, wind-warm syndrome also will adjust thereupon.Hot Secondary Air then mainly meets the requirement of coal dust smooth combustion and abundant after-flame in burner hearth, different according to coal, generally between 300 ~ 380 DEG C.
Because rotary regenerative air preheater is an integral device, rotor is by after the heating of flue gas district, heat primary air district and Secondary Air district can be added successively according to rotation direction, therefore the gentle hot secondary air temperature of heat primary air can not accomplish that difference is too large, simultaneously in order to adapt to the change of coal, air preheater design wind-warm syndrome is generally at 300 DEG C ~ about 350 DEG C, and pulverized coal preparation system is designed with a road pressure cold wind simultaneously, enters coal pulverizer with a heat hot blast blending to the temperature required.When the wind-warm syndrome that pulverized coal preparation system requires is lower, a large amount of cold wind directly enters burner hearth by pulverized coal preparation system without air preheater, and exhaust gas temperature can be caused to raise, and boiler efficiency declines, and general exhaust gas temperature often raises 12-15 DEG C, and boiler efficiency will decline 1%.
Simultaneously, owing to owing to there is dynamic and static gaps in rotary regenerative air preheater, air side pressure is malleation, and fume side pressure is negative pressure, therefore Air Leakage is inevitably had to exist, because primary air pressure is higher, the inleakage of First air side direction fume side is large, and the share of duty air preheater inleakage is the highest.The Air Leakage of air preheater causes power plant's primary air fan and air-introduced machine cigarette air capacity to increase, and power consumption increases, and power plant efficiency declines.
Summary of the invention
The separate air pre-heating system that the purpose of this utility model is to overcome prior art inefficiency and provides.
The utility model realizes by following technical scheme:
Separate air pre-heating system, comprises coal-grinding unit, burner hearth, and the output of described coal-grinding unit is connected with burner hearth by pulverized coal channel, and the flue gas output of described burner hearth is connected with the heat smoke input of First air air preheater; The flue gas output of described burner hearth is also connected with the heat smoke input of two air preheater of secondary airs;
The cold Secondary Air input of described air preheater of secondary air is connected with pressure fan; The hot Secondary Air output of described air preheater of secondary air is connected with described burner hearth;
The cold First air input of described First air air preheater is connected with primary air fan, and the heat primary air output of described First air air preheater is connected by the input of coal pulverizer inlet hot blast damper with described coal-grinding unit; Described primary air fan is connected by the input of cold First air pipeline with described coal-grinding unit; Described cold First air pipeline is provided with coal pulverizer inlet cold wind damper.Described air preheater of secondary air, described First air air preheater are provided with cold flue gas output.
Between the flue gas output of described burner hearth and the heat smoke input of described First air air preheater, pipeline is also provided with gas cooler.
Described air preheater of secondary air is two points of storehouse rotary regenerative air preheaters.
Described First air air preheater is two points of storehouse rotary regenerative air preheaters or tubular air preheater.
Adopt the technical solution of the utility model owing to First air and air preheater of secondary air being provided separately, First air and air preheater of secondary air outlet can design respectively according to most suitable wind-warm syndrome, the entrance wind-warm syndrome that wind-warm syndrome can require with coal pulverizer matches, and regulated by the condensing capacity that flows through gas cooler or confluent, thus avoid as regulating heat primary air temperature and exhaust gas temperature that a large amount of blending cold wind causes rises, the problem of boiler efficiency decline.When wherein First air air preheater adopts tubular air preheater, air leak rate of air curtain is zero substantially, can thoroughly eliminate leaking out of First air side, thus reduces exerting oneself of primary air fan and air-introduced machine, reduces power consumption and station service power consumption rate.
Accompanying drawing explanation
The existing air preheater system structural representation of Fig. 1.
Fig. 2 separate air pre-heating system structural representation.
In figure: trisector air heater 1; Air preheater of secondary air 2; First air air preheater 3; Gas cooler 4; Coal-grinding unit 5; Cold First air pipeline 6; Coal pulverizer inlet hot blast damper 7; Coal pulverizer inlet cold wind damper 8; Primary air fan 9; Pressure fan 10; Burner hearth 11.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail, but this embodiment should not be construed restriction of the present utility model, only for example, simultaneously by illustrating that advantage of the present utility model will become clearly and easy understand.
Separate air pre-heating system, comprises coal-grinding unit 5, burner hearth 11, and the output of coal-grinding unit 5 is connected with burner hearth 11 by pulverized coal channel, and First air air preheater is separated setting with air preheater of secondary air; The flue gas output of burner hearth 11 is connected with the heat smoke input of First air air preheater 3; The flue gas output of burner hearth 11 is also connected with the heat smoke input of two air preheater of secondary airs 2;
The cold Secondary Air input of air preheater of secondary air 2 is connected with pressure fan 10; The hot Secondary Air output of air preheater of secondary air 2 is connected with burner hearth 11;
The cold First air input of First air air preheater 3 is connected with primary air fan 9, and the heat primary air output of First air air preheater 3 is connected with the input of coal-grinding unit 5 by coal pulverizer inlet hot blast damper 7; Primary air fan 9 is connected with the input of coal-grinding unit 5 by cold First air pipeline 6; Cold First air pipeline 6 is provided with coal pulverizer inlet cold wind damper 8.Air preheater of secondary air 2, First air air preheater 3 are provided with cold flue gas output.
Between the flue gas output of burner hearth 11 and the heat smoke input of First air air preheater 3, pipeline is also provided with gas cooler 4.Gas cooler 4 reclaims a part of heat for external system, and controls the flue-gas temperature entering First air air preheater 3.Gas cooler 4 matches with coal pulverizer inlet hot blast damper 7, coal pulverizer inlet cold wind damper 8 control achieved the heat of mixing First air problem entering coal-grinding unit 5.
Air preheater of secondary air 2 adopts two points of storehouse rotary regenerative air preheaters.
First air air preheater 3 adopts two points of storehouse rotary regenerative air preheaters or tubular air preheater.It is higher that First air compares Secondary Air pressure, comparatively serious according to two points of storehouse rotary air preheater air leak phenomenons, therefore suggestion adopts tubular air preheater when unit capacity is little.
In production reality, can actual condition be adjusted, regulate the quantity of two kinds of form air preheaters by following scheme:
Scheme one: 2 air preheater of secondary air+2 First air air preheaters
Scheme two: 2 air preheater of secondary airs+1 First air air preheater
Scheme three: 1 air preheater of secondary airs+1 First air air preheater
Scheme four: 1 air preheater of secondary airs+2 First air air preheaters
It should be noted that: to those of ordinary skill in the art, can also make some changes or distortion to the utility model under the prerequisite not changing the utility model principle, this belongs to protection domain of the present utility model equally.
Claims (4)
1. separate air pre-heating system, comprise coal-grinding unit (5), burner hearth (11), the output of described coal-grinding unit (5) is connected with burner hearth (11) by pulverized coal channel, it is characterized in that: the flue gas output of described burner hearth (11) is connected with the heat smoke input of First air air preheater (3); The flue gas output of described burner hearth (11) is also connected with the heat smoke input of two air preheater of secondary airs (2);
The cold Secondary Air input of described air preheater of secondary air (2) is connected with pressure fan (10); The hot Secondary Air output of described air preheater of secondary air (2) is connected with described burner hearth (11);
The cold First air input of described First air air preheater (3) is connected with primary air fan (9), and the heat primary air output of described First air air preheater (3) is connected by the input of coal pulverizer inlet hot blast damper (7) with described coal-grinding unit (5); Described primary air fan (9) is connected by the input of cold First air pipeline (6) with described coal-grinding unit (5); Described cold First air pipeline (6) is provided with coal pulverizer inlet cold wind damper (8); Described air preheater of secondary air (2), described First air air preheater (3) are provided with cold flue gas output.
2. separate air pre-heating system according to claim 1, is characterized in that: between the flue gas output of described burner hearth (11) and the heat smoke input of described First air air preheater (3), pipeline is also provided with gas cooler (4).
3. separate air pre-heating system according to claim 1 and 2, is characterized in that: described air preheater of secondary air (2) is two points of storehouse rotary regenerative air preheaters.
4. separate air pre-heating system according to claim 3, is characterized in that: described First air air preheater (3) is two points of storehouse rotary regenerative air preheaters or tubular air preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372626.5U CN204648289U (en) | 2015-06-02 | 2015-06-02 | Separate air pre-heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520372626.5U CN204648289U (en) | 2015-06-02 | 2015-06-02 | Separate air pre-heating system |
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| CN204648289U true CN204648289U (en) | 2015-09-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705117A (en) * | 2017-01-22 | 2017-05-24 | 华北电力科学研究院有限责任公司 | Primary air system of thermal power plant and start and stop control method of primary air system |
| CN109268866A (en) * | 2018-09-06 | 2019-01-25 | 无锡戈滤科环境科技有限公司 | A kind of direct-firing pulverized coal combustion system of medium-speed pulverizer suitable for high-moisture coal |
-
2015
- 2015-06-02 CN CN201520372626.5U patent/CN204648289U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705117A (en) * | 2017-01-22 | 2017-05-24 | 华北电力科学研究院有限责任公司 | Primary air system of thermal power plant and start and stop control method of primary air system |
| CN106705117B (en) * | 2017-01-22 | 2023-07-11 | 华北电力科学研究院有限责任公司 | Primary air system of thermal power plant and start-stop control method thereof |
| CN109268866A (en) * | 2018-09-06 | 2019-01-25 | 无锡戈滤科环境科技有限公司 | A kind of direct-firing pulverized coal combustion system of medium-speed pulverizer suitable for high-moisture coal |
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