CN101050864B - Control method for low temperature corrosion blocking ash of coal burning boiler air preheater - Google Patents
Control method for low temperature corrosion blocking ash of coal burning boiler air preheater Download PDFInfo
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- CN101050864B CN101050864B CN2007100174963A CN200710017496A CN101050864B CN 101050864 B CN101050864 B CN 101050864B CN 2007100174963 A CN2007100174963 A CN 2007100174963A CN 200710017496 A CN200710017496 A CN 200710017496A CN 101050864 B CN101050864 B CN 101050864B
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- 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
A method for controlling low temperature corrosion and ash block of air pre-heater on coal-fired boiler includes setting one set of air bypass pipe of air pre-heater on air blowing in system of boiler, arranging air door on said air bypass pipe, using arranged air door to control air rate entering into air bypass pipe and air pre-heater, sending air rate of bypass pipe back to air blowing in system or directly to furnace tank after it is passed through pre-heater for controlling problem of low temperature corrosion and ash block at pre-heater. The system used for realizing said method is also disclosed.
Description
Technical field
The present invention relates to the pulverized-coal fired boiler air supply method, be specifically related to the control method of the stifled ash of a kind of coal-fired pot air preheater cold end corrosion.
Background technology
Because a variety of causes after coal-burning boiler puts into operation, is compared with the exhaust gas temperature design load, exists exhaust gas temperature problem higher or on the low side usually.The higher boiler exhaust gas heat loss that makes of exhaust gas temperature increases, and is unfavorable to economy; Exhaust gas temperature is on the low side then to cause air preheater cold end corrosion and stifled ash, has seriously influenced the safe operation of boiler, has to shut down deashing sometimes.When the boiler fired coal sulfur-bearing was higher, this problem was more outstanding.
Because more operating uncertain factors, such as, error during coal-fired sulfur content height, flue gas heat-transfer character difference and heating power calculate etc., at present, boiler is difficult to reach its design temperature after putting into operation, in addition, because the variation that boiler uses coal, atmospheric environment variation of temperature etc., exhaust gas temperature and acid dew-point temperature also can change thereupon, therefore, in design, can't accomplish accurately to hold exhaust gas temperature, thereby the cold end corrosion of uncontrollable air preheater and stifled ash, this just need can control exhaust gas temperature by suitable adjustment mode after putting into operation.
Air and flue system from present boiler, steam air heater generally all is installed on the intake stack of air preheater, perhaps adopted hot air circulating system, and adjusted EAT, the exhaust gas temperature of controlling air preheater by it, and then the cold end corrosion of control air preheater and stifled ash.Because the resistance of steam air heater is excessive, the design area of steam air heater is more limited; Hot air circulating system exists the problem that SR increases equally.Therefore, under the EIAJ of steam air heater or hot air circulating system, still can't solve exhaust gas temperature problem on the low side sometimes, this is to cause a part of coal-burning boiler, and the essence reason of cold end corrosion clogging phenomenon appears in the boiler that particularly uses sulphur coal.
After boiler puts into operation, when the stifled grey problem of cold end corrosion occurs, there is no good solution usually.In practice, adopt the area that reduces air preheater, economizer or other heating surface to improve exhaust gas temperature usually.Though this measure is feasible, can alleviate the cold end corrosion clogging phenomenon of air preheater.But along with the increase of unit operation time, the pickup of each heating surface of boiler increases the weight of, and caloric receptivity reduces, and higher phenomenon will appear in exhaust gas temperature.Such as, the problems referred to above just appearred in two 300MW grade boilers of LH power plant.This shows that the measure that reduces equipment heating surface areas such as air preheater exists certain problem, and nonideal solution.
As seen from the above analysis, to address the above problem well, should design the bigger special-purpose regulation and control system in adjusting leeway and control exhaust gas temperature, this is very important to solving the stifled grey problem of coal-burning boiler exhaust gas temperature air preheater cold end corrosion on the low side and that cause, to putting forward coal-fired high boiler safety in operation great practical significance is arranged.
Summary of the invention
Above-mentioned defective or deficiency at the coal-burning boiler existence, the control method that the purpose of this invention is to provide a kind of low temperature corrosion blocking ash of coal burning boiler air preheater, this method does not need external power, utilization is provided with air preheater bypass wind system and regulates the air quantity that enters air preheater, and then the stifled grey problem of cold end corrosion of controlling exhaust gas temperature and causing.
In order to realize above-mentioned task, the present invention is achieved by following technical proposals:
A kind of control method of low temperature corrosion blocking ash of coal burning boiler air preheater, it is characterized in that, this method is provided with the air bypass pipe that a cover or two overlaps air preheaters in the supply air system of boiler, and the air bypass pipe is provided with air door, is regulated the air quantity of shunt valve by this air door.During one cover bypass wind, bypass wind is sneaked in the hot secondary wind on the secondary wind-heat airduct road behind air preheater; Perhaps send into burner hearth from furnace hopper below correct position.During two cover bypass wind, cover bypass wind secondary wind-heat airduct road behind air preheater is sneaked into the hot secondary wind; Another set of bypass wind is sent into burner hearth from furnace hopper below correct position.Like this, under the constant situation of air output, can control the air quantity that enters air preheater by the adjusting of bypass air quantity.When exhaust gas temperature is on the low side, increase the bypass air quantity, reduce the air quantity that enters air preheater, its heat absorption from fume side is reduced, to improve exhaust gas temperature, the cold end corrosion of control air preheater and stifled ash; When exhaust gas temperature is higher, reduce or close bypass wind, increase the air quantity that enters air preheater, its heat absorption from fume side is increased, reducing exhaust gas temperature, in the cold end corrosion of control air preheater and stifled ash, improve boiler thermal output as much as possible.
Method of the present invention can be regulated the bypass air quantity according to atmospheric environment variations in temperature throughout the year, and control enters the air quantity and the exhaust gas temperature of air preheater, thereby can solve the stifled grey problem of exhaust gas temperature air preheater cold end corrosion on the low side and that cause; Simultaneously, can control exhaust gas temperature freely, improve the economy (being boiler thermal output) of unit operation as much as possible.
The present invention has following technical characterstic:
1, the present invention is provided with the air bypass pipe in the air preheater supply air system, and controls the air quantity that enters air preheater by the air capacity of regulating in this air bypass pipe, controls exhaust gas temperature thus.Therefore, boiler operatiopn can be regulated the bypass air quantity according to atmospheric environment variations in temperature throughout the year, and the control exhaust gas temperature can effectively solve the stifled grey problem of exhaust gas temperature air preheater cold end corrosion on the low side and that cause; Simultaneously, can effectively control the flue gas loss of boiler operatiopn, improve the economy of unit operation.
2, the control method of low temperature corrosion blocking ash of coal burning boiler air preheater of the present invention is owing to can effectively solve exhaust gas temperature problem on the low side, therefore, can consciously exhaust gas temperature be designed 10 ℃～20 ℃ on the low side during boiler design, like this, prevention, the higher problem of solution exhaust gas temperature also there is certain help.
3, the control method of low temperature corrosion blocking ash of coal burning boiler air preheater of the present invention, when the whereabouts of bypass wind was burner hearth, bypass wind was converted into the absorption heat of slags from absorbing flue gas heat, and the heat gain and loss of this part is in a basic balance.Bypass wind enters burner hearth, and flue gas temperature of hearth outlet is improved, and then exhaust gas temperature is raise; On the other hand, reduce, exhaust gas temperature is raise owing to enter the air capacity of air preheater.Because the effect of this two aspect, the share that bypass wind enters burner hearth is littler than the share that bypass wind enters secondary wind-heat airduct road, and economic loss is less relatively.
4. the control method of low temperature corrosion blocking ash of coal burning boiler air preheater of the present invention, the resistance of supply air system is reduced, compare (this obviously increases SR) with steam air heater with hot air circulation exhaust gas temperature control system, SR obviously reduces, and the power consumption of air and flue system is reduced.Exerting oneself of the original supply air system of boiler etc. had no adverse effect.
5, for the active service boiler, the control method of low temperature corrosion blocking ash of coal burning boiler air preheater of the present invention can be sent into from burner hearth when bypass wind is sent into burner hearth as far as possible, when sending into burner hearth and having any problem it is sent into secondary wind-heat airduct road.Bypass wind is sent into burner hearth, and economic loss is better relatively, but air quantity is influential to stove internal combustion situation when excessive; Bypass wind is sent into secondary wind-heat air channel, and stove internal combustion situation is not then produced any influence, but economy slightly is worse than from burner hearth and sends into.
6, the control method of low temperature corrosion blocking ash of coal burning boiler air preheater of the present invention is without any need for external power, and bypass airduct road utilizes the differential pressure of supply air system to carry bypass wind.In addition, realize that the control operation of this method all is arranged on outside the stove, good operation conditions can realize the dial plate operation.
Description of drawings
Fig. 1 is the schematic diagram of embodiment 1;
Fig. 2 is the schematic diagram of embodiment 2;
Fig. 3 is the schematic diagram of embodiment 3;
Fig. 4 is the schematic diagram of embodiment 4.
Number in the figure is represented respectively: the bypass wind connecting pipe of 1, advancing hot-air system, 2, advance the air door of the bypass wind connecting pipe of hot-air system, 3, advance the bypass wind connecting pipe of burner hearth, 4, advance the air door of the bypass wind connecting pipe of burner hearth, 5, the original pressure fan of boiler supply air system, 6, air preheater air channel import, 7, air preheater; 8, secondary wind-heat airduct road; 9, boiler body; 10, burner hearth bypass bellows; 11, bypass wind air inlet.
The present invention is described in further detail below in conjunction with accompanying drawing.
The specific embodiment
The control method of low temperature corrosion blocking ash of coal burning boiler air preheater of the present invention, the air bypass pipeline of one cover or two cover air preheaters is set in the supply air system of boiler, the air bypass pipeline is provided with air door, regulate the air quantity (this air quantity reduces) enter air preheater by air door when the bypass air quantity increases and make itself and flue gas heat exchange, and then reach the control exhaust gas temperature and grey purpose is blocked up in the air preheater cold end corrosion.The basic equipment of realizing this method comprises traditional connecting pipe, air door and electronic control system thereof (not providing among the latter figure), at different boilers, can increase other auxiliary equipment or electronic control system on the basis of basic equipment.
Below be the embodiment that the inventor provides, need to prove, the invention is not restricted to these embodiment.
Embodiment 1:
Referring to Fig. 1, present embodiment is provided with the air bypass pipeline 1 that two-way advances hot-air system, and correspondence is arranged on first and second liang of air channels of boiler respectively, and Fig. 1 only provides a side, and opposite side is identical with Fig. 1.By the air quantity of the ducted air door of air bypass 2 controls, under the constant situation of air output, the air quantity that enters air preheater 7 by air preheater intake stack 6 is reduced with the increase of bypass wind by bypath system; Minimizing with bypass wind increases, thereby its heat absorption from fume side is reduced, and perhaps increases, and then reaches the purpose of control exhaust gas temperature and the stifled ash of air preheater cold end corrosion.Bypass wind is sent into hot secondary air channel road 8 by air bypass pipeline 1 somewhere from the secondary wind-heat airduct road 8 after air preheater.Then, enter burner hearth with hot secondary wind.
Embodiment 2:
Referring to Fig. 2, present embodiment has two-way to advance the air bypass pipeline 1 of burner hearth, and correspondence is arranged on first and second liang of air channels of boiler respectively, and Fig. 2 only provides a side, and opposite side is identical with Fig. 2.By the air quantity of the ducted air door of its air bypass 4 controls, under the constant situation of air output, the air quantity that enters air preheater 7 by air preheater intake stack 6 is reduced with the increase of bypass wind by bypath system; Minimizing with bypass wind increases, thereby its heat absorption from fume side is reduced, and perhaps increases, and then reaches the purpose of control exhaust gas temperature.Bypass wind directly enters burner hearth 10 with it from burner hearth bottom by air bypass pipeline 1.
Embodiment 3:
Referring to Fig. 3, present embodiment has two-way to advance the air bypass pipeline 1 of burner hearth, and correspondence is arranged on first and second liang of air channels of boiler respectively, and Fig. 3 only provides a side, and opposite side is identical with Fig. 3.By the air quantity of the air door in its air bypass pipeline 34 control, under the constant situation of air output, the air quantity that enters air preheater 7 by air preheater intake stack 6 is reduced with the increase of bypass wind by bypath system; Minimizing with bypass wind increases, thereby makes its heat absorption from fume side reduce or increase, and then reaches the purpose of control exhaust gas temperature and the stifled ash of air preheater cold end corrosion.Bypass wind is sent into bypass wind bellows 10 by air bypass pipeline 3, and directly it is entered burner hearth 9 from burner hearth bottom by bypass wind air inlet 11.
Embodiment 4:
Referring to Fig. 4, present embodiment has two-way to advance the air bypass pipeline 1 of hot-air system, and correspondence is arranged on first and second liang of air channels of boiler respectively, and Fig. 4 only provides a side, and opposite side is identical with Fig. 4.By the air quantity of ducted air door 2 controls of air bypass by this bypath system; Simultaneously, also have two-way to advance the air bypass pipeline 1 of burner hearth, correspondence is arranged on first and second liang of air channels of boiler respectively, and Fig. 4 only provides a side, and opposite side is identical with Fig. 4.By the air quantity of 4 controls of the air door in its air bypass pipeline 3 by this bypath system.Under the constant situation of air output, the air quantity that enters air preheater 7 by air preheater intake stack 6 is reduced with increase of this two covers bypass wind; Minimizing with bypass wind increases, thereby makes its heat absorption from fume side reduce or increase, and then reaches the purpose of control exhaust gas temperature and the stifled ash of air preheater cold end corrosion.One cover bypass wind is sent into hot secondary air channel road 8 by the somewhere on the secondary wind-heat airduct road 8 of air bypass pipeline 1 after air preheater.Then, enter burner hearth with hot secondary wind; Another set of bypass wind is sent into bypass wind bellows 10 by air bypass pipeline 3, and directly it is entered burner hearth 9 from burner hearth bottom by bypass wind air inlet 11.
Operation principle of the present invention is as follows:
Method of the present invention is controlled the air quantity that enters bypass airduct road and air preheater by the air bypass pipeline that is installed in the air preheater on the air preheater intake stack, and controls its caloric receptivity from fume side by the air quantity that enters air preheater.When entering the air quantity minimizing (increase of bypass wind) of air preheater, its caloric receptivity from fume side reduces, and exhaust gas temperature is raise; When entering the increase of air preheater air quantity, its caloric receptivity from fume side increases, and exhaust gas temperature is reduced.Reach the purpose of control exhaust gas temperature and the stifled ash of air preheater cold end corrosion with this.
Compare with the supply air system of existing equipment, enter the air quantity of air preheater can be on certain degree manual control, thereby reach the purpose of effective control exhaust gas temperature. This system is very simple, and is easy to implement, very suitable active service boiler improvement and newly constructed boiler. For the active service boiler, it is very easy to construct, and the boiler flue external form is not changed; And do not need to increase power-equipment, do not need to transform yet and send induced draught system, be convenient to very much implement. For then easier enforcement of newly constructed boiler.
According to the system of the stifled grey control method preparation of air preheater cold end corrosion of the present invention, can be adapted to the coal-burning boiler of the various combustion systems of various capacity.
Claims (2)
1. the control method of a low temperature corrosion blocking ash of coal burning boiler air preheater, it is characterized in that, this method is provided with the air bypass pipeline of a cover air preheater in the supply air system of boiler, the air bypass pipeline is provided with air door, the air quantity of regulating the bypass air quantity and entering air preheater by air door, bypass wind is sent into burner hearth from furnace hopper below correct position, under the constant situation of air output, adjusting by bypass wind can be controlled the air quantity that enters air preheater, thereby controls its caloric receptivity from fume side, the cold end corrosion of exhaust gas temperature and air preheater and stifled ash.
2. the control method of a low temperature corrosion blocking ash of coal burning boiler air preheater, it is characterized in that, this method is provided with two cover air bypass pipelines in the supply air system of boiler, be equipped with the air door of connecting pipe on the two cover air bypass pipelines, the air quantity of regulating the air quantity of each bypass wind and entering air preheater by air door, sneak into the hot secondary wind after the powder process dry wind suction opeing on the one secondary wind-heat airduct road of cover bypass air quantity behind air preheater on the air-flow direction, another set of bypass wind is sent into burner hearth from furnace hopper below correct position, under the constant situation of air output, adjusting by this two covers bypass wind can be controlled the air quantity that enters air preheater, thereby controls its caloric receptivity from fume side, the cold end corrosion of exhaust gas temperature and air preheater and stifled ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100174963A CN101050864B (en) | 2007-03-13 | 2007-03-13 | Control method for low temperature corrosion blocking ash of coal burning boiler air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100174963A CN101050864B (en) | 2007-03-13 | 2007-03-13 | Control method for low temperature corrosion blocking ash of coal burning boiler air preheater |
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| CN101050864A CN101050864A (en) | 2007-10-10 |
| CN101050864B true CN101050864B (en) | 2010-08-25 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230636B (en) * | 2011-03-29 | 2015-09-30 | 宝钢工业炉工程技术有限公司 | The low-temperature protection device of preheater metallic heat exchanging tube |
| CN102829486A (en) * | 2012-09-25 | 2012-12-19 | 中国东方电气集团有限公司 | System for increasing the temperature of secondary air at inlet of air pre-heater |
| CN104567476B (en) * | 2015-01-05 | 2017-01-18 | 洛阳瑞昌石油化工设备有限公司 | Plate type air preheating device with adjusting function |
| CN107842874A (en) * | 2017-10-26 | 2018-03-27 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of primary and secondary air heat distribution regulating system and method |
| CN107816732A (en) * | 2017-10-26 | 2018-03-20 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of air preheater cold end wall temperature adjusting means and method |
| CN109882879B (en) * | 2019-04-03 | 2024-03-29 | 华能国际电力股份有限公司玉环电厂 | Full operating mode flue gas denitration and air preheater anti-blocking system |
| CN110906359B (en) * | 2019-11-18 | 2021-05-11 | 上海发电设备成套设计研究院有限责任公司 | Combustion device capable of adjusting secondary air temperature and use method |
| CN112133942A (en) * | 2020-09-30 | 2020-12-25 | 上海海事大学 | Fuel cell of ship electric propulsion system and application thereof |
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