Coal full-grain size grading pyrolysis and active coke preparation coupling process and system in coal gas circulating

Abstract

The invention provides a coal full-grain size grading pyrolysis and active coke preparation coupling process and system in coal gas circulating. The process comprises the following steps: dividing raw coal into slack coal and pea coal through a raw coal preheating and grading system and drying the raw coal by utilizing high temperature flue gas discharged by a coal gas heating furnace; with the obtained steam-containing tail gas as an activating agent and pyrolysis coal gas generated by the coal gas heating furnace per se as an activating agent heating flue, enabling the obtained high temperature activating agent to be in direct contact with high temperature semicoke from a slack coal pyrolyzing furnace and a pea coal pyrolyzing furnace to activate the semicoke. The process provided by the invention has the advantages that raw coal pyrolysis is coupled with active coke preparation and the coal gas generated by the pyrolysis is utilized to serve as the energy of active coke activation, so that the production cost is low; water carried by the raw coal per se serves as the source of a steam activating agent, so that water is saved in the production process; the high temperature semicoke from the pyrolyzing furnaces is in direct contact with the high temperature activating agent to be activated and the sensible heat of the high temperature semicoke is utilized, so that the production energy consumption is low; gas containing combustible components generated by activation serves as the compensatory fuel of the pyrolysis, so that the energy recycling efficiency is high.

Description

Technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a process and system for preparing coal gas circulating coal full particle size classification pyrolysis coupled activated coke. [0002] Background technique [0003] Activated coke is an activated carbon adsorption material with a relatively developed pore structure and a large specific surface area produced by a special production process with coal as the main raw material. It has the characteristics of strong adsorption capacity and good chemical stability, and is widely used. In the field of environmental treatment such as sewage treatment, flue gas desulfurization and denitrification. [0004] Activated coke and activated carbon are both carbonaceous materials with special adsorption functions, but the most obvious advantage of activated coke over activated carbon is its low price. At present, the traditional method for preparing coal gas circulating coal full parti...

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Problems solved by technology

[0007] 1. During the pyrolysis process of pulverized coal, phenol-containing wastewater is generated, and the discharge of pollutants is large;

[0008] 2. The pyrolysis gas produced during the pulverized coal pyrolysis process has a high powder content, which makes it difficult to remove dust, and the recovered tar has a high dust content;

[0009] 2. The activator is water vapor, and fresh activator needs to be evaporated to make up for it, which consumes a lot of water;

[0010] 3. After pyrolysis, the high-temperature semi-coke is cooled by inert gas, and then screened and classified. The granular coke is directly fed into the activation furnace, and the coke powder is molded and then enters the activation furnace, and then heated up and activated together. There are cumbersome procedures, many equipments, and large investment. , high energy consumption

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