Pyrolysis device and gas-based shaft kiln combined system and method for treating coal

Abstract

The invention discloses a pyrolysis device and gas-based shaft kiln combined system and a method for treating coal. The system comprises a pyrolysis device, a separating and purifying system, a reforming and transforming system and a gas-based shaft kiln, wherein the pyrolysis device comprises a device body, a particle moving bed, a pyrolysis oil-gas outlet, a catalyst inlet and a catalyst outlet; the particle moving bed comprises an outer casing and an inner casing, the inner casing is located inside the outer casing, and the outer casing and the inner casing are fixed on the side wall of the lower part of the device body, so that the inner space of the particle moving bed is limited. According to the method, raw materials are pyrolyzed, produced pyrolysis oil-gas is treated by the separating and purifying system and the reforming and transforming system, and reduced gas is obtained and sent into the gas-based shaft kiln for iron and steel smelting. With the adoption of the system and the method, pulverized coal difficult to utilize usually is effectively utilized, the pyrolysis gas produced by the pyrolysis device has the low dust content, the subsequent treatment cost and energy consumption are reduced, and the reduced gas produced by the system can be directly applied to production of the gas-based shaft kiln.

Description

technical field [0001] The invention belongs to the technical field of step-by-step utilization of coal, and in particular relates to a pyrolysis device combined with a gas-based shaft furnace and a coal processing method for medium and low-rank pulverized coal such as long-flame coal and lignite. Background technique [0002] The structural characteristics of coal itself determine that low-rank coal has high volatile content and strong activity. Due to high moisture and oxygen content and low calorific value, the direct utilization (combustion or gasification) efficiency is low, and the economic value is far inferior to high-rank coal. Therefore, The low-rank coal developed and utilized on a large scale must be processed and upgraded before it can be used for domestic production. One of the most scientific and commonly used processing methods is pyrolysis, also known as "dry distillation" or "thermal decomposition". Pyrolysis refers to a series of physical changes and chem...

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Problems solved by technology

[0004] However, the pyrolysis oil and gas produced by coal pyrolysis has complex components, heavy tar components, large dust content, and irregular dust shape. It requires subsequent installation of complex dust removal systems to process pyrolysis oil and gas to obtain coal-to-gas and high-quality tar

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