CN104990074A - Coal burning method - Google Patents
Coal burning method Download PDFInfo
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- CN104990074A CN104990074A CN201510379039.3A CN201510379039A CN104990074A CN 104990074 A CN104990074 A CN 104990074A CN 201510379039 A CN201510379039 A CN 201510379039A CN 104990074 A CN104990074 A CN 104990074A
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Abstract
The invention belongs to the field of coal, and discloses a coal burning method which comprises the step of burning coal to be burnt, wherein the fineness R of pulverized coal of the coal to be burnt is 30 to 45 percent, and the Na2O content of the coal to be burnt is 3 to 10 percent by weight. The coal burning method has the advantage that the contamination condition of a tail duct of a boiler used for burning coal can be reduced obviously, particularly when the boiler is used for burning coal of which the alkali metal content is relatively high, so that the stop-for-ash-removing cycle of the boiler is prolonged.
Description
Technical field
The invention belongs to coal field, the present invention relates to a kind of method of coal combustion.
Background technology
Accurate eastern coalfield resources reserves reach 3,900 hundred million tons, are the maximum at present self-contained coalfields of China.Calculate with present coal in China annual production, an eastern coalfield of standard uses more than 120 year with regard to enough national.
Accurate eastern coal igniting temperature is low, burn-off rate is high, and combustion economization is high, and has the low advantage of pollutant emission, is therefore excellent steam coal, meets the target of China's energy-saving and emission-reduction especially.But the alkali metal oxide content such as sodium, potassium is higher in the flying dust of accurate eastern coal, thus cause it to make boiler flue have serious fouling characteristics in combustion, threaten and affect the safe operation of boiler.
The many employings of boiler put into effect at present mix the method for the coal that alkali metal content is less in burning coal ash to use accurate eastern coal, but, when adopting in this way, make the ratio that uses of the accurate eastern coal of most boiler be no more than 60%.Further, the reserves of Xinjiang region low alkali coal are well below the eastern coal of standard, and current low alkali coal source is in short supply, and future more will face the situation can mixing burning without coal.
In addition, the price of current Xinjiang region low alkali coal has been more than 2 times of accurate eastern coal, and due to scarcity of resources, its price difference following also will expand further.If turn down alkali metal coal to enter Xinjiang region greatly will increase production cost from other places, have a strong impact on the economic benefit of electricity power enterprise.Therefore, for Xinjiang region, area, especially accurate east, the accurate eastern coal of clean burn is a kind of inevitable trend.
Affect because afterbody stains main cigarette temperature, the wall temperature etc. of being subject to, and can not find the method for the gentle wall temperature of the cigarette that obviously can reduce operating boiler flue at present, thus accurate eastern coal burning boiler blowing out cleaning cycle is shortened greatly, seriously reduce the economic benefit of electricity power enterprise.
Therefore, the method for coal that a kind of burning alkali metal content that can overcome above-mentioned defect is higher is badly in need of at present finding.
Summary of the invention
The object of this invention is to provide the method for the higher coal of a kind of alkali metal content that burns, use the method coal combustion, the contamination of the back-end ductwork of the boiler of coal combustion obviously can be alleviated during the coal that particularly alkali metal content is higher, thus the blowing out cleaning cycle of the boiler of prolonging combustion coal.
To achieve these goals, the invention provides a kind of method of coal combustion, the method comprises burns coal to be combusted, the fineness of pulverized coal R of described coal to be combusted
90for 30-45%, the Na containing 3-10 % by weight in described coal to be combusted
2o.
By the contamination of the back-end ductwork of the boiler of coal combustion obviously can be alleviated during technique scheme coal combustion, thus the blowing out cleaning cycle of the boiler of prolonging combustion coal, and significantly improve economic benefit.
As can be seen from the result of embodiments of the invention and comparative example also: when adopting method coal combustion of the present invention, the contamination of the back-end ductwork of the boiler of coal combustion obviously can be alleviated by other condition controlled in the fineness of pulverized coal of coal to be combusted and Optimizing Combustion, thus the blowing out cleaning cycle of the boiler of prolonging combustion coal.Be in particular: adopt method coal combustion of the present invention, particularly burn alkali metal content higher coal time, when boiler runs at least 5 days continuously, the contamination of boiler tail is not obvious, and boiler operatiopn is good; And adopting the method coal combustion in comparative example, during the coal that particularly burning alkali metal content is higher, under same combustion case, boiler runs 2 days continuously and just finds afterwards, and the contamination layer of boiler tail is not easily blown off by soot blower, affects boiler and normally runs.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Below the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, described burning oxygen amount refers to the oxygen content in furnace outlet flue gas:
The invention provides a kind of method of coal combustion, the method comprises burns coal to be combusted, the fineness of pulverized coal R of described coal to be combusted
90for 30-45%, the Na containing 3-10 % by weight in described coal to be combusted
2o.
The above-mentioned method coal combustion provided of the present invention is provided, during the coal that particularly burning alkali metal content is higher, obviously can alleviate the contamination of the back-end ductwork of the boiler of coal combustion, thus the blowing out cleaning cycle of the boiler of prolonging combustion coal, and significantly improve economic benefit.
The present invention is to the fineness of pulverized coal R controlling described coal to be combusted
90for the method for 30-45%, there is no particular limitation, and the various methods that those skilled in the art can adopt this area routine to use control fineness of pulverized coal, as long as can make described fineness of pulverized coal R
90for 30-45%.Such as, the present invention can control the fineness of pulverized coal of described coal to be combusted by adjustment separator for coal mill baffle plate.To the model of described coal pulverizer, there is no particular limitation in the present invention, can be the various coal pulverizers that this area routine uses.
In the method for coal combustion of the present invention, the fineness of pulverized coal R of further preferred described coal to be combusted
90for 35-40%.
The method of coal combustion of the present invention is specially adapted to the Na containing 4-8 % by weight in coal to be combusted
2the burning of coal of O.The contamination serious conditions of the boiler back end ductwork that the method causes when can alleviate the coal of burning high basic metal content further.
In order to alleviate the contamination of boiler back end ductwork further, in the method for coal combustion of the present invention, the condition preferably controlling described burning makes the phosphorus content of the flying dust burnt be 5-8 % by weight.
More preferably, in situation, in the method for coal combustion of the present invention, can the condition of control combustion the phosphorus content of the flying dust burnt be made to be 6-7 % by weight.
In the method for coal combustion of the present invention, those skilled in the art can adopt various routine in this area to use the phosphorus content of the flying dust of various method control combustion, the present inventor finds under study for action, when being 2.5-4% by the burning oxygen amount of control combustion, further can alleviate the contamination of boiler back end ductwork.
Particularly preferably in situation, in the method for coal combustion of the present invention, when the burning oxygen amount of described burning is 3-3.5%, the contamination of the boiler back end ductwork of coal combustion can be alleviated more significantly, thus the boiler shutdown cleaning cycle of prolonging combustion coal, and significantly improve economic benefit.
Particularly preferably in situation, combustion method of the present invention is applicable to the standard east coal picking up from accurate eastern coalfield.
Under preferable case, in method of the present invention, described burning is carried out in the boiler.There is no particular limitation to the model of described boiler for method of the present invention, and method of the present invention adapts to the conventional various boilers in this area, and preferred boiler of the present invention is π type boiler.
There is no particular limitation to add the speed of coal to be combusted in boiler described in method subtend of the present invention, and those skilled in the art can select in the speed adding coal in boiler that this area routine uses.
Especially, in the present invention, described back-end ductwork comprises horizontal flue and the vertical well gas flue of boiler.
According to one of the present invention preferred embodiment, described burning is carried out in the boiler, and the condition of burning comprises: burning oxygen amount is 2.5-4%, the fineness of pulverized coal R of described coal to be combusted
90for 30-45%, the phosphorus content of the flying dust of described burning is 5-8 % by weight.
When adopting said method coal combustion of the present invention, obviously can alleviate the contamination of the back-end ductwork of the boiler of the higher coal of burning alkali metal content, thus the blowing out cleaning cycle of the boiler of prolonging combustion coal, and significantly improve economic benefit.
The following examples will be further described the present invention, but not thereby limiting the invention.
Unless stated otherwise, used in comparative example and embodiment reagent is commercially available product.The coal used in following examples and comparative example is all as the criterion eastern coal, wherein about containing 7 % by weight Na
2o.Method of the present invention is carried out in the boiler of the accurate eastern coal coal dust of burning.
Embodiment 1
The present embodiment is for illustration of the method for coal combustion of the present invention.Particularly:
The described burning of the present embodiment is carried out in the boiler, and the burning oxygen amount of described burning is 3.5%, the fineness of pulverized coal R of described standard to be combusted east coal
90be 37%, the phosphorus content of the flying dust of described burning is 6 % by weight.
Adopt said method to make boiler run 7 days continuously, visually observe discovery: the contamination of boiler tail is not obvious, and boiler operatiopn is good.
Embodiment 2
The present embodiment is for illustration of the method for coal combustion of the present invention.Particularly:
The described burning of the present embodiment is carried out in the boiler, and the burning oxygen amount of described burning is 3.2%, the fineness of pulverized coal R of described standard to be combusted east coal
90be 35%, the phosphorus content of the flying dust of described burning is 7 % by weight.
Adopt said method to make boiler run 7 days continuously, visually observe discovery: the contamination of boiler tail is not obvious, and boiler operatiopn is good.
Embodiment 3
The present embodiment is for illustration of the method for coal combustion of the present invention.Particularly:
The described burning of the present embodiment is carried out in the boiler, and the burning oxygen amount of described burning is 3.5%, the fineness of pulverized coal R of described standard to be combusted east coal
90be 40%, the phosphorus content of the flying dust of described burning is 6.5 % by weight.
Adopt said method to make boiler run 7 days continuously, visually observe discovery: the contamination of boiler tail is not obvious, and boiler operatiopn is good.
Embodiment 4
The present embodiment is for illustration of the method for coal combustion of the present invention.
The present embodiment adopts the accurate eastern coal of method burning described in embodiment 1, and wherein, difference is:
The fineness of pulverized coal R of described standard to be combusted east coal
90be 42%.
Particularly, the method for the present embodiment is:
Described burning is carried out in the boiler, and the burning oxygen amount of described burning is 3.5%, the fineness of pulverized coal R of described standard to be combusted east coal
90be 42%, the phosphorus content of the flying dust of described burning is 6 % by weight.
Adopt said method to make boiler run 5 days continuously, visually observe discovery: the contamination of boiler tail is not obvious, and boiler operatiopn is good; Boiler runs 7 days continuously and observes discovery afterwards: boiler tail has a small amount of contamination, and boiler operatiopn is good.
Embodiment 5
The present embodiment is for illustration of the method for coal combustion of the present invention.
The present embodiment adopts the accurate eastern coal of method burning described in embodiment 2, and wherein, difference is:
Described burning oxygen amount is 2.7%, and the phosphorus content of the flying dust of described burning is 8 % by weight.
Particularly, the method for the present embodiment is:
Described burning is carried out in the boiler, and the burning oxygen amount of described burning is 2.7%, the fineness of pulverized coal R of described standard to be combusted east coal
90be 35%, the phosphorus content of the flying dust of described burning is 8 % by weight.
Visually observe discovery after adopting said method to make boiler run 5 days continuously, the contamination of boiler tail is not obvious, and boiler operatiopn is good; Boiler observes discovery after running 7 days continuously, and boiler tail has a small amount of contamination, and boiler operatiopn is better.
Comparative example 1
Adopt the method coal combustion described in embodiment 1, wherein, difference is:
Method described in the prior art is adopted to control fineness of pulverized coal R
90be 20%, burning oxygen amount is 3%, and the phosphorus content of the flying dust of described burning is 1 % by weight.
Visually observe discovery after adopting said method to make boiler run 2 days continuously, the contamination layer of boiler tail is not easily blown off by soot blower, affects boiler and normally runs.
Comparative example 2
Adopt the method coal combustion described in comparative example 1, wherein, difference is:
Method described in the prior art is adopted to control fineness of pulverized coal R
90be 50%, burning oxygen amount is 2.5%, and the phosphorus content of the flying dust of described burning is 15 % by weight.
Visually observe discovery after adopting said method to make boiler run 2 days continuously, boiler tail has more contamination, affects boiler and normally runs.
Can be found out by the result contrasting above-described embodiment 1-5 and comparative example 1-2, when adopting method coal combustion of the present invention, obviously can be alleviated the contamination of the back-end ductwork of the boiler of coal combustion by other condition controlled in the fineness of pulverized coal of coal to be combusted and Optimizing Combustion, thus extend the blowing out cleaning cycle of the boiler of coal.
Below describe the preferred embodiment of the present invention in detail in conjunction with the embodiments; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. a method for coal combustion, is characterized in that, the method comprises burns coal to be combusted, the fineness of pulverized coal R of described coal to be combusted
90for 30-45%, the Na containing 3-10 % by weight in described coal to be combusted
2o.
2. method according to claim 1, wherein, the fineness of pulverized coal R of described coal to be combusted
90for 35-40%.
3. method according to claim 1, wherein, the Na containing 4-8 % by weight in described coal to be combusted
2o.
4. the condition according to the method in claim 1-3 described in any one, wherein, controlling described burning makes the phosphorus content of the flying dust burnt be 5-8 % by weight.
5. method according to claim 4, wherein, the condition controlling described burning makes the phosphorus content of the flying dust burnt be 6-7 % by weight.
6. according to the method in claim 1-3 described in any one, wherein, the burning oxygen amount of described burning is 2.5-4%.
7. method according to claim 6, wherein, described burning oxygen amount is 3-3.5%.
8. according to the method in claim 1-3 described in any one, wherein, described coal to be combusted is as the criterion eastern coal.
9. according to the method in claim 1-3 described in any one, wherein, described burning is carried out in the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510379039.3A CN104990074A (en) | 2015-07-01 | 2015-07-01 | Coal burning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510379039.3A CN104990074A (en) | 2015-07-01 | 2015-07-01 | Coal burning method |
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| CN104990074A true CN104990074A (en) | 2015-10-21 |
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| CN201510379039.3A Pending CN104990074A (en) | 2015-07-01 | 2015-07-01 | Coal burning method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010067689A1 (en) * | 2008-12-09 | 2010-06-17 | 株式会社タイホーコーザイ | Pulverization assistant for coal and use thereof |
| CN104502218A (en) * | 2015-01-08 | 2015-04-08 | 西安热工研究院有限公司 | Simple and convenient method for distinguishing contamination characteristic of coal ash |
-
2015
- 2015-07-01 CN CN201510379039.3A patent/CN104990074A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010067689A1 (en) * | 2008-12-09 | 2010-06-17 | 株式会社タイホーコーザイ | Pulverization assistant for coal and use thereof |
| CN104502218A (en) * | 2015-01-08 | 2015-04-08 | 西安热工研究院有限公司 | Simple and convenient method for distinguishing contamination characteristic of coal ash |
Non-Patent Citations (3)
| Title |
|---|
| 刘璀巍: "苇湖梁电厂锅炉燃用新疆准东煤特性研究", 《发电技术》 * |
| 程智海，王义，李学兵，等: "现役锅炉纯烧准东煤技术研究", 《中国动力工程学会锅炉专业委员会2012年论文集》 * |
| 胡小梅，李鹏: "发电锅炉结焦原因分析以及解决方法", 《新疆电力技术》 * |
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Application publication date: 20151021 |