CN103528089A - Method and device for controlling coal fired boiler wind pressure changing combustion - Google Patents
Method and device for controlling coal fired boiler wind pressure changing combustion Download PDFInfo
- Publication number
- CN103528089A CN103528089A CN201310488000.6A CN201310488000A CN103528089A CN 103528089 A CN103528089 A CN 103528089A CN 201310488000 A CN201310488000 A CN 201310488000A CN 103528089 A CN103528089 A CN 103528089A
- Authority
- CN
- China
- Prior art keywords
- fuel
- blast
- wind pressure
- boiler
- air
- Prior art date
Links
- 238000002485 combustion reactions Methods 0.000 title claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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- 230000037351 starvation Effects 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound 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[S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000004083 survival Effects 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
- 239000002699 waste materials Substances 0.000 description 1
Abstract
The invention discloses a method and device for controlling coal fired boiler wind pressure changing combustion, and belongs to the technical field of boiler combustion. The method for controlling the coal fired boiler wind pressure changing combustion comprises the steps that firstly, wind pressure is adjusted so that fuel can be combusted under the normal wind pressure; secondly, when an ash protective layer is formed on the surface of the fuel, the wind pressure is increased, then the ash protective layer on the surface of the fuel is blown away, and therefore the air is fully mixed with the fuel; thirdly, the wind pressure is reduced to the normal wind pressure, and then combustion is carried out; fourthly, after the ash protective layer is formed on the surface of the fuel, the wind pressure is increased again, the ash protective layer on the surface of the fuel is blown away, and the wind pressure is cyclically adjusted for combustion until the fuel is fully combusted. According to the method and device for controlling the coal fired boiler wind pressure changing combustion, combustion efficiency can be remarkably improved to more than 92%, the carbon content of slag is reduced to below 8%, and heat efficiency can reach to about 80%.
Description
Technical field
The invention belongs to boiler combustion technology field, be specifically related to control method and device that a kind of coal-burning boiler becomes blast burning.
Background technology
The energy is the engine of economy and social development, the survival and development that the exploitation exploitation of the energy and control are directly connected to the mankind, high speed development along with national economy, increasing to the demand of the energy on the one hand, energy resources but can not infinitely be supplied with on the other hand, so energy availability and demand contradiction is that China is also the key subjects that countries in the world generally face.
General chain grate boiler design bunker coal is specific coal, take bituminous coal as example, no matter all be that furnace arch structure or coal-air ratio all design by bituminous coal, the thermodynamical model of boiler is to be also that fuel designs by bituminous coal, according to this thermodynamical model, be equipped with control system and setup control parameter simultaneously, and in fact due to the variation of coal market, raising up of coal price, it is fixed that the selected fuel coal of current enterprise is just come by market, thereby sometimes can not completely according to design coal, go to use causes the design of boiler not conform to actual situation, affect the thermal efficiency of boiler, secondly, because traveling-grate stoker is grate firing, inevitable because the part coal in chain upper end is in burning, on the surface of the superiors, form softening grey shell, this grey shell is starvation in short-term, and inner coal cannot fully be burnt, thereby causes the thermal efficiency of boiler to reduce.
Therefore, how to improve the thermal efficiency of existing boiler, improve the utilization rate of coal, solve existing coal-burning boiler and use in service in reality, the thermal efficiency is low, and energy waste is large, and dust exhausting concentration is large, the sulfur content of coal is high, the problem ，Shi boiler enterprise current urgent problem serious to atmosphere pollution.
Summary of the invention
The object of this invention is to provide control method and device that a kind of coal-burning boiler becomes blast burning, to reach the thermal efficiency that improves boiler, improve the object of the utilization rate of coal.
The present invention is achieved by the following technical solutions:
Coal-burning boiler becomes a control method for blast burning, and step is:
(1) adjust blast, make fuel depress burning in normal wind;
(2) when fuel surface forms after grey protective layer, strengthen blast, the grey protective layer of fuel surface is blown off, air is fully mixed with fuel;
(3) reduce blast to normal blast, burn;
(4) when fuel surface forms after grey protective layer, again strengthen blast, the grey protective layer of fuel surface is blown off, so circulation adjustment blast burns, until fuel combustion is abundant.
Further, above-mentioned control method becomes in blast burner and completes at following coal-burning boiler, comprise the water inlet system being connected to form successively by pipeline by demineralizer, water supply tank, small pump and circulating pump, the port of export of circulating pump connects economizer by pipeline, economizer is also connected with boiler respectively at air preheater, described air preheater is connected respectively at air blast, air-introduced machine and boiler by pipeline, and described water inlet system, boiler and air blast, air-introduced machine are connected respectively at control system.
Further, described small pump comprises main small pump and next choice water pump in parallel, and described circulating pump comprises main circulation pump in parallel and standby circulating pump.
The input of the control system in apparatus of the present invention is connected with boiler, water supply system respectively, image data, and the output of control system is connected with air-introduced machine respectively at air blast, carries out transformation and adjusts wind.The operation principle of this is: fuel on grate under a wind pressure value normal combustion; because granularity difference, the coal seam thickness of coal are uneven; cause in combustion process; along with the carrying out of burning can form thick grey protective layer at fuel surface; under same blast, air is difficult for and fuel mix, strengthens at this moment blast and just the grey shell of fuel surface can be blown off in time, makes air and fuel mix abundant; under pulse blast, constantly by oxidized, can improve the firing out rate of fuel.
The inventive method can improve efficiency of combustion significantly, reaches more than 92%, reduces boiler slag carbon content, can drop to below 8%, and the thermal efficiency reaches 80% left and right.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention:
In figure: 1-demineralizer, 2-water supply tank, the main small pump of 3-, 4-next choice water pump, 5-main circulation pump, 6-are for circulating pump, 7-economizer, 8-air preheater, 9-air blast, 10-air-introduced machine, 11-boiler, 12-control system.
The specific embodiment
Below in conjunction with embodiment, the present invention will be further described.
A kind of coal-burning boiler as shown in Figure 1 becomes blast burner, comprise the water inlet system being connected to form successively by pipeline by demineralizer 1, water supply tank 2, small pump and circulating pump, the port of export of circulating pump connects economizer 7 by pipeline, economizer 7 is also connected with boiler 11 respectively at air preheater 8, described air preheater 8 is connected respectively at air blast 9, air-introduced machine 10 and boiler 11 by pipeline, and described water inlet system, boiler 11 and air blast 9, air-introduced machine 10 are connected respectively at control system 12.
Wherein small pump comprises main small pump 3 and next choice water pump 4 in parallel, and described circulating pump comprises main circulation pump in parallel 5 and standby circulating pump 6.
During work, step is:
(1) adjust blast, make fuel depress burning in normal wind;
(2) when fuel surface forms after grey protective layer, strengthen blast, the grey protective layer of fuel surface is blown off, air is fully mixed with fuel;
(3) reduce blast to normal blast, burn;
(4) when fuel surface forms after grey protective layer, again strengthen blast, the grey protective layer of fuel surface is blown off, so circulation adjustment blast burns, until fuel combustion is abundant.
Claims (3)
1. coal-burning boiler becomes a control method for blast burning, it is characterized in that, step is:
(1) adjust blast, make fuel depress burning in normal wind;
(2) when fuel surface forms after grey protective layer, strengthen blast, the grey protective layer of fuel surface is blown off, air is fully mixed with fuel;
(3) reduce blast to normal blast, burn;
(4) when fuel surface forms after grey protective layer, again strengthen blast, the grey protective layer of fuel surface is blown off, so circulation adjustment blast burns, until fuel combustion is abundant.
2. method claimed in claim 1 becomes in blast burner and completes at following coal-burning boiler, it is characterized in that, comprise by demineralizer (1), water supply tank (2), the water inlet system that small pump and circulating pump connect to form successively by pipeline, the port of export of circulating pump connects economizer (7) by pipeline, economizer (7) is also connected with boiler (11) respectively at air preheater (8), described air preheater (8) by pipeline respectively at air blast (9), air-introduced machine (10) is connected with boiler (11), described water inlet system, boiler (11) and air blast (9), air-introduced machine (10) connects respectively at control system (12).
3. coal-burning boiler according to claim 2 becomes blast burner, it is characterized in that, described small pump comprises main small pump (3) and next choice water pump (4) in parallel, and described circulating pump comprises main circulation pump in parallel (5) and standby circulating pump (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310488000.6A CN103528089A (en) | 2013-10-18 | 2013-10-18 | Method and device for controlling coal fired boiler wind pressure changing combustion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310488000.6A CN103528089A (en) | 2013-10-18 | 2013-10-18 | Method and device for controlling coal fired boiler wind pressure changing combustion |
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| Publication Number | Publication Date |
|---|---|
| CN103528089A true CN103528089A (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310488000.6A CN103528089A (en) | 2013-10-18 | 2013-10-18 | Method and device for controlling coal fired boiler wind pressure changing combustion |
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