Device for preparing clean coal by thermally decomposing, gasifying and semi-carbonizing waste

Abstract

The invention discloses a device for preparing clean coal by pyrolyzing, gasifying and semi-carbonizing a waste. The device comprises a material supply system, a material pre-treatment system, a thermal decomposition and semi-carbonization device, a combustion and gasification device, a food additive addition device, a clean coal cooling and collecting system and a synthesis gas reuse system, wherein the material supply system and the material pre-treatment system are connected, a food additive is arranged in the food additive addition device, both the food additive addition device and the material pre-treatment system are connected with the thermal decomposition and semi-carbonization device, both the synthesis gas reuse system and the thermal decomposition and semi-carbonization device are connected with the combustion and gasification device, and the thermal decomposition and semi-carbonization device is connected with the clean coal cooling and collecting system. The device for preparing the clean coal by pyrolyzing, gasifying and semi-carbonizing the waste is simple in structure, produces the clean coal by fully using the low-grade coal and the agricultural waste, and effectively saves the energy, the surface of the powdered coal is coated with an addition biomass, the combustion efficiency is stable, the gas emission is low, the spontaneous combustion is prevented, and the occurrence of fire and explosion is avoided.

Description

technical field [0001] The invention relates to a device for preparing clean coal, in particular to a device for preparing clean coal by pyrolysis, gasification and semi-carbonization of waste. Background technique [0002] Generally, waste is pyrolyzed and gasified using a horizontal flue gas furnace, a thermal rotary kiln pyrolysis gasifier, an exothermic rotary kiln pyrolysis gasifier with inclined surfaces using high The heat rotates the waste, and when the solid waste is introduced, the waste is pyrolyzed and gasified at high temperature. In this type of thermal rotary kiln, the pyrolysis gasification should be carried out under the condition of anoxic and anoxic, which will produce a certain amount of gas and residue, however, when air is introduced into the cracking gasifier, there is a great risk of fire , high temperature thermal shock, and a risk of explosion. [0003] Through this thermal rotary kiln pyrolysis gasification furnace, the method of gasifying and ca...

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Problems solved by technology

In this type of thermal rotary kiln, the pyrolysis gasification should be carried out under the condition of anoxic and anoxic, which will produce a certain amount of gas and residue, however, when air is introduced into the cracking gasifier, there is a great risk of fire , high temperature thermal shock, and creates an explosion risk

[0003] Through this thermal rotary kiln pyrolysis gasification furnace, the method of gasifying and carbonizing waste as fuel, in order to reduce the life (running time) of the pyrolysis gasification furnace and power generation equipment caused by thermal shock phenomenon and explosion Said, many heat sources are required to maintain the gas volume at high temperature, leading to the problem of poor thermal efficiency

[0004] In addition, the use of thermal rotary kiln to semi-carbonize waste to prepare high-quality coal, that is, clean coal, must be operated under anaerobic and low temperature conditions. If excessive air quality is introduced, the risk of fire is high, and there is And the risk of thermal shock phenomenon and explosion, the method of semi-carbonizing waste through this thermal rotary kiln is to shorten the life of the semi-carbonization furnace through thermal shock and explosion, which results in the need for a heat source to maintain the high-temperature gas volume and equipment costs increase, which reduces thermal efficiency

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