A new process for sewage treatment of fixed bed batch gasifier based on environmental protection

Abstract

The invention provides a new environmental protection-based fixed-bed intermittent gasifier sewage treatment process. The process steps include: temporarily storing the gas-making hot sewage in the sewage storage tank and then flowing into the vacuum flash tank, depressurizing and evaporating, and water vapor entering the column The tube heat exchanger is heat-exchanged and condensed, and the condensed water returns to the vacuum flash tank. The uncondensed benzene, phenol, cyanide and other harmful substances are pumped out by the vacuum pump, and then sent to the blower to pressurize and enter the gas generator for combustion; the cooled sewage enters the vacuum filter. The sludge is filtered by the ash machine and pumped into the gas making system for the next cycle after being pressurized by the water pump. The sludge is sent to the thermoelectric boiler for recycling, and the exhaust gas from the vacuum ash filter is sent to the blower together with the exhaust gas from the vacuum pump. The invention optimizes the traditional gas-making sewage treatment process, recycles the harmful substances and the energy contained in the hot sewage produced by the gasifier, forms a closed cycle system, eliminates the discharge of toxic and harmful substances, and improves the scientific nature of the production process And rationality, to achieve the purpose of energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an environment-friendly fixed-bed intermittent gasifier sewage treatment process. Background technique [0002] Coal gasification enterprises have begun to take shape in my country. Among all the current coal gasification technologies in China, fixed bed gasification technology is the most widely used and most mature coal gasification technology. Compared with other types of gasifiers, the fixed-bed batch gasifier has the smallest investment, the most mature technology and normal operation, so it occupies a huge proportion in my country's gasification technology. However, its production wastewater treatment problem has become a bottleneck restricting the development of the industry. my country's coal gasification projects are mainly distributed in water-scarce areas or key watersheds of the South-to-North Water Diversion Project. Some coal gasification enterprises cann...

AI Technical Summary

Problems solved by technology

However, its production wastewater treatment problem has become a bottleneck restricting the development of the industry

my country's coal gasification projects are mainly distributed in water-scarce areas or key watersheds of the South-to-North Water Diversion Project. Some coal gasification enterprises cannot expand their production scale due to wastewater discharge problems, and some enterprises even face the bad luck of suspending production for rectification.

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