A method for improving pollution and coking of burning high-sodium coal
A technology for high-sodium coal and pollution, which is applied in the direction of combustion methods, non-flammable liquid/gas transportation, and combustion equipment. Dosage, the effect of reducing drying output
Active Publication Date: 2017-12-08
SHANGHAI POWER EQUIP RES INST +1
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Problems solved by technology
[0009] The technical problem to be solved by the present invention is: to provide a method for reducing the primary air volume and moisture in the raw coal, which is beneficial to the ignition and burnout of coal powder, and to improve the pollution and coking of high-sodium coal, which solves the serious coking of the heating surface of the boiler , Contamination and clogging of ash, resulting in the problem that the boiler cannot operate safely and stably for a long time
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[0022] In order to make the present invention more obvious and comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
[0023] A method of improving the contamination and coking of burning high-sodium coal of the present invention, such as figure 1 Shown is a system diagram of a test device for a method for improving fouling and coking with high-sodium coal. Including the raw coal bunker 1, the raw coal in the raw coal bunker 1 enters the coal mill 4 through the coal feeder 3 and is ground into pulverized coal, and the pulverized coal is burned in the boiler burner 5, and a screen superheater is installed on the top of the furnace above the burner 5. 6. After passing through the furnace, it goes to the air preheater 7, and then it is discharged through the boiler tail 8. The air preheater 7 extracts the cold primary air a1 and the cold secondary air a2 from one end and forms the hot primary air a3 and the hot secondary ...
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The invention discloses a method for improving stain coking of burning high-sodium coal. One part of secondary hot air in an outlet of an air pre-heater is introduced to a coal dropping pipe on the bottom of a raw coal bunker, wherein a heating device is mounted on the coal dropping pipe; and then, secondary hot air, which is used for heating raw coal by the heating device, is introduced to a secondary air spray nozzle in the uppermost layer of boiler overfire air. According to the technical scheme adopted by the invention, the method has the following advantages that: firstly, the temperature of raw coal which enters a coal mil can be greatly increased, and moisture in the raw coal can be reduced; secondly, dosage of primary air can be reduced; thirdly, after the dosage of the primary air and the moisture in the raw coal are reduced, ignition and complete combustion of pulverized coal are facilitated; an fourthly, moisture content of secondary air which is used for heating raw coal is increased, and after the secondary air is introduced into an upper furnace hearth (SOFA air position), the outlet temperature of the furnace hearth is reduced, the oxidizing atmosphere of the furnace hearth is improved, an ash fusion point is increased in a facilitated mode, and a stain coking condition of a heated surface is avoided or improved.
Description
technical field [0001] The invention relates to a method for improving the fouling and coking of burning high-sodium coal, and belongs to the technical field of power generation boilers. Background technique [0002] The eastern part of the Junggar Basin in Xinjiang is a narrow strip from Fukang City to Mulei Kazakh Autonomous County, about 220 kilometers long from east to west. The predicted reserves of Zhundong Coalfield resources reach 390 billion tons, and the accumulated reserves of coal resources are currently 213.6 billion tons, making it the largest integrated coalfield in my country. [0003] At present, the coal produced in the Zhundong mining area is mostly used for power generation. However, after being widely used in the existing boilers of the built power plant, the boiler heating surface (especially the screen superheater) is exposed to serious coking, fouling and ash blocking, which makes the boiler unable to long-term safe and stable operation. In response...
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IPC IPC(8): F23K1/04F23L15/00F23L9/00
CPCY02E20/34
Inventor 周文台何翔魏增涛曹建文马达夫金鑫
Owner SHANGHAI POWER EQUIP RES INST