Comprehensive utilization method for coal chemical industry gasified black water high-temperature flashing steam

Abstract

The invention relates to a comprehensive utilization method for coal chemistry industry gasified washing black water high-temperature flashing steam. The high-temperature flashing steam first directly heats part of a grey water mixture to high temperature in a combined purifying tower, and then grey water and a low-temperature grey water mixture which is discharged through a deaerator are mixed and pumped into a vaporization washing tower to be recycled after set temperature is reached; the non-condensation high-temperature flashing steam is purified on the upper section of the tower, a first high-temperature flashing steam condenser and a second high-temperature flashing steam condenser are introduced to prepare secondary steam, the secondary steam is used for a raw ammonia recycling stripping tower and a strong brine evaporating system, and excessive secondary steam is introduced into a low-pressure steam pipeline net; part of high-temperature flashing steam condensate is introduced into the gasification deaerator, the remaining condensate and non-condensation high-temperature flashing steam enter the ammonia recycling stripping tower for separation, ammonia gas is pumped out along a lateral line to prepare ammonium hydroxide, carbon dioxide, hydrogen sulfide and other gas are introduced into a sulfur recycling system for sulfur recycling and then enter a carbon dioxide recycling system. Finally, the high-temperature flashing steam is sufficiently utilized.

Description

technical field [0001] The invention belongs to the waste gas and wastewater treatment links in the fields of coal chemical industry, new energy chemical industry, petrochemical industry, etc., and specifically relates to the composition of water vapor, ammonia, hydrogen sulfide, carbon dioxide, carbon monoxide, hydrogen and other components produced by high-temperature flash evaporation of gasification and washing black water. The thermal energy utilization and useful component recovery method of the high-temperature flash gas (referred to as high flash gas, the same below) are divided. Background technique [0002] Coal chemical and emerging energy enterprises such as synthetic ammonia, coke, methanol, diethyl ether, and dimethyl ether form high-temperature gasification washing water at 230-260°C during the cooling and washing process of coal gasification and gasification gas, which is called gasification washing black. Water, which contains ammonia, carbon dioxide, hydrog...

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Problems solved by technology

But at the same time, the load of the waste heat boiler in the transformation section of the enterprise is often full. If the heating temperature of gray water rises, the waste boiler system will not be able to bear it.

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