Coal fired boiler 33 MW capacity
Coal fired boiler 33 MW capacity
At present, China’s energy consumption is mainly coal, and it is the largest country in the world. Data analysis shows that in recent years, China has changed from coal exporter to coal importer. So far, China accounts for 47% of global coal consumption and remains the world’s largest country. Coal still plays a central role in China’s rapid economic growth.
There are many types of combustion boilers in China.
According to the combustion mode, it is divided into: chamber suspended combustion, layer combustion, boiling combustion, etc.
Boiler combustion is an extremely complex physical and chemical reaction process. According to the special requirements of coal quality of L industry boilers, the maximum use of fuel energy can be obtained by mixing several kinds of single coal with different properties in a certain proportion by means of power blending. This not only overcomes the defect of single kind of coal, but also enables users to get coal with stable quality. Improve the utilization rate of poor coal; Improve the boiler’s thermal efficiency and other advantages.
Combustion furnace classification
(1) chamber suspended combustion: the fuel is suspended combustion in the fire chamber without grate, but the fuel requirements are high, can only use pulverized coal, liquid, gas fuel, and the basic particle size of pulverized coal is less than 0.1mm. Combustion fuel with air as a carrier, i. generally do not need power coal.
(2) boiling combustion: the grate of the boiler burner is made of steel plates (16~20mm thick) or cast iron plates (30~ 40mm thick) evenly distributed with air holes with diameters of 35 ~ 40mm. The blast is blown into the charge layer by the air hole. The particle size of mainly used low-quality coal is less than 8mm and the main particle size is between 0.2–3mm. Generally, no power coal blending is needed. The hot material layer in the boiling state is up to 1~1.5m, and the agitation and mixing of coal particles and air in the coal seam is strong. Therefore, the coal particles have good heating conditions and wide adaptability to coal, especially can burn low-quality coal with low volatilization, high ash content and low calorific value, and even coal gangue. If add limestone in boiling layer, pass intense agitate, can remove sulfur in fuel adequately, can avoid low temperature already corroded, can reduce environmental pollution again.
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