Down-flow gas semi-coke activated pulverized coal pyrolysis system and method

Abstract

The invention relates to a down-flow gas semi-coke activated pulverized coal pyrolysis system and method. The system is characterized in that a high-temperature flue gas heat exchanger is communicated with a second L-shaped valve, a first L-shaped valve, a vertical mill and an upward heating riser; the vertical mill is communicated with a dry pulverized coal surge bin; a cyclone mixer is communicated with a high-temperature semi-coke surge bin, the high-temperature flue gas heat exchanger, the dry pulverized coal surge bin and a downer reaction pipe; the downer reaction pipe is communicated with an oil-gas cyclone dust collector; the oil-gas cyclone dust collector is communicated with a semi-coke cooler and the upward heating riser; the upward heating riser is communicated with a primary cyclone dust collector; the primary cyclone dust collector is communicated with a secondary cyclone dust collector; the secondary cyclone dust collector is communicated with a ternary cyclone dust collector; the ternary cyclone dust collector is communicated with the high-temperature flue gas heat exchanger; and the primary cyclone dust collector, the secondary cyclone dust collector and the ternary cyclone dust collector are communicated with the high-temperature semi-coke surge bin. The system and the method can be used for improving the yield of coal tar and reducing the consumption of energy, the dust collectors discharge materials smoothly, and subsequent fine dust removal is carried out stably.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a system and method for producing coal tar, semi-coke and coal gas by pyrolysis of coal gas semi-coke activated pulverized coal in a down-flow type. Background technique [0002] The graded utilization of high volatile bituminous coal and lignite is an important way of clean coal chemical industry. The coal topping device has low investment, low energy consumption, high thermal efficiency, and has broad market prospects and good economic benefits. [0003] From the pyrolysis mechanism and practice, it is proved that fast pyrolysis and fast derivation can increase the yield of coal pyrolysis coal tar. Pyrolysis of pulverized coal less than 200 mesh belongs to flash pyrolysis, with high liquid yield, good controllability of powder transport by airflow, simple process and low investment, so it is highly praised. However, due to the small particle size of ...

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Problems solved by technology

The patent is a counter-current method, with materials from top to bottom, gas from bottom to top, and heat heated by gas and side walls. This method uses gas heat carrier and indirect heat exchange because the pulverized coal is in a suspended state, and the gas heat carrier The amount is large, and a large amount of fine coal powder is carried out with the gas, which makes it difficult to remove dust from the raw coal gas

The above patents do not propose a targeted and resolute solution for the waste gas dust removal system. According to the fact that the raw gas contains a large amount of coal tar, it is easy to deposit carbon and agglomerate in the temperature range.

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