A low-rank pulverized coal continuous dry distillation process and device

Abstract

The invention relates to a low-rank pulverized coal continuous carbonization process and device. The low-rank pulverized coal enters an externally heated continuous carbonization furnace through a double-sealed feeding device and a material buffer bin, and collects raw coal gas through a gas collection device and a gas collection chamber. It is exported from the gas collection system; the furnace charge after dry distillation is discharged through the discharge device; there are two types of discharge device to choose from, the first discharge device is to discharge the powder charge through the coke discharge drum; the second discharge device is to discharge the charge After cooling, it is continuously and evenly discharged into the charge buffer device through the discharge control valve, and then discharged through the quantitative discharge valve after secondary cooling. The invention realizes the process of continuous carbonization in an externally heated continuous carbonization furnace using low-rank pulverized coal as raw material, and can prevent cross-leakage of air inside and outside the carbonization chamber during the charging process, and realize effective sealing; the raw coal gas generated in the carbonization process can be quickly exported, It can also increase the yield of light oil and the calorific value of gas; in the process of discharging coke, it can control the uniform and continuous discharge of powder coke, and the quality of semi-coke can be controlled and adjusted.

Description

technical field [0001] The invention relates to the technical field of low-rank coal dry distillation, in particular to a low-rank pulverized coal continuous dry distillation process and device. Background technique [0002] Low-rank coal refers to coal with a low degree of coalification. This type of coal is of low quality, widely distributed in my country, and has a large output. In the process of mining low-rank coal, a large amount of pulverized coal (coal with a particle size below 13mm) will be produced. Due to the poor air permeability and good fluidity of pulverized coal, traditional techniques and technologies cannot be used for dry distillation of pulverized coal. The pulverized coal is basically wasted. Therefore, how to continuously dry distill pulverized coal, increase the yield of light oil and increase the calorific value of gas; effectively control the discharge of powder coke; effectively seal and prevent dust and gas leakage are important links in this des...

AI Technical Summary

Problems solved by technology

[0003] The main problems in the traditional low-rank coal carbonization process and technology: 1) Due to the poor air permeability of pulverized coal, the gas cannot be exported smoothly

Therefore, the traditional coal carbonization furnace can only carbonize lump coal, but not pulverized coal. The cost of raw materials is high and the economic benefit is low.

Since the gas produced in the dry distillation process cannot be exported smoothly, the gas is subjected to long-term high temperature cracking, the yield of light tar in the gas is low, and the calorific value of the gas is also reduced accordingly; 2) Due to the good fluidity of powdered coke, the traditional The paddle-type discharge device cannot seal and control the discharge of powder coke; 3) The interface between the charging valve and the charge introduction device adopts a socket type, which cannot be effectively sealed, and dust and gas flow from the socket gap during coal charging Serious leakage, causing environmental pollution

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