Method, system and process for preparing powdered activated coke by carbonization and activation of pulverized coal

Abstract

The invention discloses a two-stage method, system and process for preparing powdered activated coke by carbonizing and activating pulverized coal. Activation treatment to obtain powdered activated coke and activation gas, pyrolysis gas is burned to obtain combustion flue gas, combustion flue gas is used as the heat source of activation treatment, combustion flue gas indirectly heats carbonized material and water vapor to obtain waste heat flue gas, waste heat flue gas As part of the heat source of the carbonization process, the waste heat flue gas indirectly heats the pulverized coal, and the activated gas is used as another part of the heat source of the pulverized coal, and the activated gas is in contact with the pulverized coal. The present invention divides carbonization and activation into two processes, and the combustion of pyrolysis gas in the carbonization section provides heat sources for the activation section, carbonization section and coal powder preheating in turn, and the comprehensive energy utilization rate of the system is high, and the coking coal consumption is low. The carbonized pyrolysis gas has a high content of combustible gas, high calorific value, easy and stable combustion, and is convenient to use.

Description

technical field [0001] The invention belongs to the field of active coke preparation, and relates to a method, a system and a process for preparing powdered active coke by carbonizing and activating pulverized coal in two stages. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Activated coke usually has a well-developed pore structure and certain surface chemical activity, and has a wide range of applications in the fields of gas and water purification. The applicant has long-term research in the field of active coke preparation for flue gas desulfurization. In order to reduce the production cost of active coke, the applicant has patent application number 201310176387.1 "...

AI Technical Summary

Problems solved by technology

[0004] In practice, the applicant found that the above-mentioned patented method and device have the following problems: the carbonization and activation medium of pulverized coal coking use the high-temperature flue gas produced by pulverized coal combustion, and in order to ensure that the coking reaction is fully carried out, the coking must be ensured The temperature at the furnace outlet is above 850°C, so more pulverized coal needs to be burned to provide heat, and the energy consumption of coking is high; during the coking process, pulverized coal is in direct contact with high-temperature flue gas, and the combustible gas pyrolyzed from pulverized coal is mixed into the flue gas and Oxygen combustion in flue gas leads to low calorific value of coking pyrolysis gas and difficulty in utilization

Images