Micro-oil ignition coal powder combusting device
A technology for pulverized coal burner and micro-oil ignition, which is applied to burners, burners for burning powder fuel, combustion methods, etc. and other problems to achieve the effect of improving stability, shortening warm-up time, and avoiding insufficient ignition stability
Inactive Publication Date: 2008-03-05
CHINA JILIANG UNIV
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Problems solved by technology
Therefore, when the actual required length of the entire pulverized coal burner exceeds the upper limit, it will lead to a reduction in the burnout rate of pulverized coal at the outlet of the burner; this will greatly reduce the stability of ignition, and even lead to failure of normal ignition
Therefore, the above-mentioned existing burners only have good adaptability to bituminous coal and lignite with high volatile content, and their application is greatly restricted.
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[0014] The present invention will be further described below in conjunction with drawings and embodiments.
[0015] As shown in Fig. 1 and Fig. 2, the present invention includes a pulverized coal concentrator 2, a primary air channel 1 with a square cross section and a pulverized coal combustion chamber 6 with a square cross section. The pulverized coal concentrator 2 is composed of a left taper section 2.1, a middle throat section 2.2 and a right taper section 2.3 connected in sequence from left to right; the longitudinal section of the left taper section 2.1 is large at the left end and small at the right end isosceles trapezoid, the longitudinal section of the gradual expansion section 2.3 on the right is an isosceles trapezoid with a small left end and a large right end; therefore the whole pulverized coal concentrator 2 is a pipeline with large left and right ends and small middle. The left tapering section 2.1 communicates with the primary air passage 1, and the right ta...
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This invention declares a tiny-oil ignition combustor of coal powder including successively connected primary air channel, coal powder concentrator and coal powder combustor with overlapping axis. At least 2 oil combustors are positioned symmetrically on the coal combustor, each has a tiny oil gun at the inlet and a coal powder concentrator connected to the outlet; the axis of the oil combustor has an angle of 40degree-60degree with the primary air channel. The symmetrically position of double oil guns solves the heating problem of distal fuel with unilateral oil gun and saves the preheating time. This invention can accomplish the preheating and drying of the fuel and ignition in a much shorter distance, which eliminates the instability of ignition and low burnout rate of coal powder because of the inadequate length of coal powder combustor.
Description
technical field [0001] The invention relates to a pulverized coal burner, which belongs to a cold-state ignition and ultra-low-load stable combustion device for a pulverized coal boiler in a power station; in particular, it relates to a pulverized coal burner with micro-oil ignition. Background technique [0002] my country is a big oil importing country. In May 2005, the National Development and Reform Commission launched the "Medium and Long-term Special Plan for Energy Conservation", which proposed the goal of saving and replacing 38 million tons of oil during the "Eleventh Five-Year Plan" period, and was listed as the top ten energy-saving projects. The conventional method for boiler start-up and low-load stable combustion in a thermal power station is to use a large oil gun to inject oil; taking a 300MW unit as an example, 50-100T of fuel oil needs to be input during the cold start-up of the boiler from ignition to pulverized coal with load. With the use of micro-oil ig...
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Inventor 闫志勇徐鸿魏恩宗孔凡玉
Owner CHINA JILIANG UNIV