Oil shale dry-process coking method and water spraying structure of gas retort

Abstract

The invention relates to an oil shale dry-process coking method and a water spraying structure of a gas retort. The gas retort adopting the water spraying structure is characterized in that steam is taken as a carrier of a gas barrier layer, the lower part of the gas retort is respectively introduced with saturated vapor and / or sprayed with water having the temperature of 25-80 DEG C, the pressure of the water is 8000 Pa, the vapor pressure is 7500 Pa, a water vapor barrier layer with the height of 2-3m is formed by the water vapor and / or water which enters the gas retort under the action of high temperature semi-coking, so that the gas is prevented from overflowing, and oxygen is avoided to enter the gas retort along with the air; when in running, the water spray pressure can be regulated to lead the pressure at a gas outlet of the gas retort to be micro-positive pressure and the semi-coking outlet pressure to be micro-negative pressure, so that dry-process coking can be realized; a spray pipe is arranged above a cooling water pipe and is vertical to a semi-coking channel, the end of the spray pipe is provided with an automatic regulating valve, and the spray pipe is also provided with an even spray hole. The invention decreases the volume of the gas by about one third, and reduces the subsequent technique, current management running cost or investment to the same extent.

Description

Technical field [0001] The method of the present invention is suitable for a gas full-cycle oil shale dry distillation furnace and a dry distillation furnace structure modified for implementing the method. Background technique [0002] At present, in the metallurgical and coal chemical industries, there are dry coke quenching technologies, which generally use air or nitrogen to cool the coke and recover heat. However, this method is not applicable to oil shale retorting furnaces, mainly because oxygen is not allowed to be mixed in the oil shale retorting products. Once a certain limit is exceeded, the oil recovery device is prone to explosion and the equipment cannot be operated. [0003] Oil shale retort furnaces at home and abroad, whether it is Fushun furnace, Maoming square furnace, foreign Brazilian furnace (Petrosix), Estonia's Kiviter furnace, all use wet coking, the main reason is to prevent the escape of gas in the retort furnace , Dry distillation gas contains toxic subs...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the semi-coke with a large amount of water has brought a series of difficult technical problems, and it needs to consume a lot of water, and the water content in the semi-coke is generally about 20%.

A 3 million tons of oil shale carbonization plant consumes more than 600,000 tons of water to cool semi-coke, and the water in the semi-coke will leak into the ground to cause pollution, and the calorific value of the semi-coke with water is reduced, and it is easy to freeze in winter Frozen, bad transportation and many other problems

[0004] In 2006, Northeast Electric Power University proposed the oil shale refining furnace dry coke extraction process, patent publication number: CN1986733A, because this process needs to install the retort furnace on a platform with a height of 8-10m, and also need to increase Roots blower, crushing I don't know what the reason is, but so far, no user has been seen

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