Overall rotary type solid thermal carrier retort

Abstract

The invention relates to the technical field of powdered coal pyrolysis equipment, and in particular discloses an overall rotary type solid thermal carrier retort which comprises a retort outer cylinder, wherein a preheating chamber, a destructive distillation chamber and a combustion chamber are arranged inside the retort outer cylinder; the destructive distillation chamber comprises an inner cylinder fixedly connected with the retort outer cylinder; at least one preheating tube is arranged inside the preheating chamber; one end of the preheating tube is communicated with the inner cylinder of the destructive distillation chamber; a high-temperature semicoke feeding hole is formed in one end, close to the preheating tube, of the inner cylinder; a pyrolysis semicoke discharge hole is formed in the other end of the inner cylinder; the high-temperature semicoke feeding hole is communicated with a first return material channel; the other end of the first return material channel is communicated with the combustion chamber; the pyrolysis semicoke discharge hole is connected with a second return material channel; the other end of the second return material channel is communicated with the combustion chamber. By adopting the overall rotary type solid thermal carrier retort disclosed by the invention, powdered coal is preheated in an indirect heating mode with heat conduction intensification measures, and rapid pyrolysis of the powdered coal is achieved through direct blending and mixing of a solid thermal carrier and preheated raw coal.

Description

technical field [0001] The invention relates to the technical field of pulverized coal pyrolysis equipment, in particular to an integral rotary solid heat carrier carbonization furnace. Background technique [0002] Thermal decomposition of coal refers to the chemical process in which coal is heated in the absence of air to form gas, tar and semi-coke (or coke) products. According to the pyrolysis temperature, it is divided into low-temperature pyrolysis of 500-650°C, medium-temperature pyrolysis of 650-800°C, high-temperature pyrolysis of 900-1000°C and ultra-high temperature pyrolysis of >1200°C. According to the heating rate, it can be divided into slow pyrolysis of 3-5°C / min, medium-speed pyrolysis of 5-100°C / min, fast pyrolysis of 50-105°C / min and flash pyrolysis of >106°C. [0003] High-yield tar and gas can be extracted by using rapid pyrolysis method to improve the quality of low-rank pulverized coal. At the same time, the semi-coke produced is not only a high...

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Problems solved by technology

[0004] The solid heat carrier pyrolysis technology has short pyrolysis time and high thermal efficiency of the system, but the existing solid heat carrier pyrolysis technology mostly uses gas-solid two-phase flow transportation and separation equipment, which is prone to sticking of tar and semi-coke particles. The junction and system pipes are blocked, and the power consumption and dusty gas processing capacity are also relatively large. The rotary pyrolysis equipment is suitable for small particle size materials, and the pyrolysis powder is in a state of continuous stirring during the pyrolysis process, and no air flow is used to transport materials. Therefore, the dust content in the flue gas and retort gas is significantly reduced, and the post-treatment difficulty of retort gas is reduced. However, several types of rotary pyrolysis equipment in the prior art have certain limitations, such as slow pyrolysis speed and long pyrolysis time. , and then produce secondary decomposition of tar, low oil recovery

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