Coal pyrolysis method for increasing oil yield by introducing fusel

Abstract

The invention belongs to the technical field of chemical engineering. A Coal pyrolysis method for increasing oil yield by introducing fusel comprises the following steps: (1) injecting the fusel through pumping into a preheater and preheating the fusel into steam; (2) introducing the fusel steam or fusel steam mixed with a carrier gas into a coal pyrolysis reactor, and carrying out a coal pyrolysis reaction on the fusel and coal at a reaction temperature of 450-650 DEG C for 10-30min; (3) purifying and condensing a reaction product of raw coke oven gas, recovering tar, and sending coal gas out; and (4) discharging a product semi coke through bottom of a moving-bed reactor. According to the invention, fusel is introduced into a low-temperature coal pyrolysis reaction system for the first time; pyrolysis products of the fusel in the reactor react with debris free radicals generated by coal pyrolysis to generate a free radical stable product, so as to improve oil yield of the coal pyrolysis; meanwhile, due to existence of effects like hydrogenation in the coal pyrolysis process, portion of the oil product is converted into a light fraction, and utilization of fusel is realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a coal pyrolysis method for increasing oil yield. Background technique [0002] my country is the world's largest coal producer and consumer. With the tightening of national energy, especially oil resources, and the continuous growth of energy demand, the position of the coal industry in my country's economic development has become increasingly prominent. The polygeneration utilization of coal is the future direction of development, and the clean development and utilization of coal is bound to be a concern of the world. From the analysis of the chemical structure and composition of coal, it is the direction of coal energy utilization to form a new integrated process of high efficiency, cleanliness, and rational utilization of resources through the hierarchical transformation of coal. [0003] In the comprehensive utilization of coal, coal low-temperature py...

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Problems solved by technology

Due to the structural characteristics and chemical properties of coal itself, the tar yield of the traditional pyrolysis process is low, and it is difficult to meet the huge market demand

[0004] In the existing coal low-temperature pyrolysis process, after the coal is heated to 480-650°C, the coal is pyrolyzed in the reactor, and the gas phase is raw coal gas generated by the pyrolysis reaction, and the reaction product stays in the reactor for a long time. It is easy to cause the tar that has been volatilized into the gas phase to undergo secondary cracking reaction and free radical polymerization reaction, thereby reducing the yield of tar

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