Three-tail-gas heat recycling method

Abstract

The invention discloses a three-tail-gas heat recycling method which comprises the steps: exchanging heat of three tail gases with air by utilizing the temperature of 140-160 DEG C of the three tail gases; leading the three gases into a coal rod drying furnace, wherein the temperature of air is about 130 DEG C because the air is drier after being overheated; and ensuring that the bin temperature of the coal rod drying furnace ranges from 110 DEG C to 120 DEG C. The three-tail-gas heat recycling method has simple operation, is not needed to be controlled, completely satisfies an air amount requirement of the drying furnace and has stable coal rod moisture between 6 percent and 8 percent. The coal consumption of 20y / day of a hot-blast furnace is saved, meanwhile, the original hot-blast furnace can generate smoke dust in a running process, and waste heat of the three gases is used for drying coal rods and can not generate smoke dust; the original hot-blast furnace needs two operators per shift and has large labor intensity and poor operational environment, and the hot-blast furnace is unmanned and reduces the cost. The three-tail-gas heat recycling method uses the waste heat of the three gases to control the coal rod content and the mechanical strength of an artificial gas furnace, consequently, the physical quantity consumption of the coal rod is reduced, a gas-production furnace condition is optimized, and the labor intensity is reduced.

Description

technical field [0001] The invention relates to a coal rod drying process in pulverized coal molding and vaporization technology, in particular to a heat recovery and utilization method of trigas tail gas. Background technique [0002] Synthetic ammonia is an important chemical fertilizer and occupies an important position in the chemical industry. In the production of synthetic ammonia, the batch method is generally adopted, that is, the air and water vapor are alternately carried out separately to form a working cycle for preparing semi-water gas, and the time required for each cycle is about 3 minutes. In order to make the raw material gas produced not only meet the needs of synthetic ammonia, but also make full use of it. Generally, each working cycle is divided into 6 stages: ①Blowing. Air is fed from the bottom of the furnace to burn the coal material and increase the temperature of the furnace, and the blowing air is vented through the vent pipe. ② Recycling. In t...

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Problems solved by technology

[0003] The hot blast stove is used to produce hot flue gas, and it is put into the coal rod drying furnace to dry the coal rods. Due to the small amount of hot air, a certain amount of cold air is required before entering the drying furnace, which cannot meet the production requirements, and the flue gas itself contains A certain amount of moisture will cause the temperature of the drying furnace to be between 40°C and 60°C, and the moisture content of the coal rods to fluctuate between 7% and 9%, and the energy consumption of the hot blast furnace is high, and the coal consumption per day is about 20 tons. Poor, produces a lot of smoke and dust, and the hot air volume of the drying furnace is small

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