A coal impurity removal system

Abstract

The invention discloses a coal impurity removing system, which comprises a feeding mechanism, a conveying device, a microwave heating cavity and a collecting device, wherein the conveying device is connected with the feeding mechanism and extends in a conveying direction to penetrate through the microwave heating cavity to be connected with the collecting device; the microwave heating cavity comprises a first chamber and a second chamber; the first chamber is located at one end, close to the feeding mechanism, of the microwave heating cavity; the second chamber is located on the downstream of the first chamber in the conveying direction; and the microwave power in the first chamber is larger than that of the second chamber. With the adoption of the technical scheme, the method for heating coal raw materials by the microwave is utilized so as to effectively remove impurities of the coal raw materials, the impurity removing efficiency is high, and the impurity effect is good; and meanwhile, the coal raw materials can be prevented from burning caused by over high temperature, so that the safety of impurity removing process is guaranteed, the complexity of impurity removing operation is reduced, the manpower and working time are saved, and the industrial production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of coal processing, in particular to a coal impurity removal system. Background technique [0002] Before coal is processed, it usually contains a lot of impurities, which need to be removed before use. The most abundant impurity is water. Coal that has not been treated for impurities usually contains a large amount of water, for example, the water content of coal slime reaches more than 25%, and the water content of lignite is as high as about 33%. The high water content of coal not only increases the weight and transportation cost, but also reduces the calorific value, which seriously affects the economic efficiency of coal. In addition, another major impurity in coal is sulfur. The combustion of sulfur-containing coal will cause serious pollution to the environment. Therefore, coal desulfurization is required in the process of coal processing. It can be seen that the impurity removal treatment of coal, especiall...

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Problems solved by technology

Since coal itself is combustible, it is easy to spontaneously ignite during the process of heating coal at high temperature, which will not only reduce the quality of coal, but also cause safety problems

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