Coal gasification black grey water energy recovery and fly ash reutilization system

Abstract

The invention provides a coal gasification black grey water energy recovery and fly ash reutilization system, and belongs to the technical field of coal gasification. The system comprises a separation device, a lock hopper, a clear liquid storage tank and a thick slurry recovery processing device, and the separation device comprises a shell, a filter unit arranged in the shell and a backwashing pipeline arranged outside the shell; an inlet pipeline for introducing black grey water and a compensation liquid pipeline for introducing compensation liquid are arranged on the shell; the lock hopper is communicated with the shell; the filtration liquid storage tank is communicated with the opening end of the calandria outside the shell, and the first outlet is used for being communicated with a backwashing pipeline; and the thick slurry recovery processing device is communicated with the lock hopper. The coal gasification black and grey water energy recovery and fly ash reutilization system provided by the invention replaces the processes of flash evaporation and the like in the prior art, removes ash and recycles fly ash slag under the condition that the black and grey water is not depressurized and cooled, simplifies the process flow, reduces the energy consumption, reduces the occupied area and reduces the investment.

Description

Technical field [0001] The present invention belongs to the field of coal gasization, and more particularly, it is to involve coal gasification, black and agglomeration, and fly ash re-use system. Background technique [0002] As one of my country's three major petrochemical energy, coal is mainly used in important areas such as civil fuel, power generation, chemical industry and industrial fuel. "Rich coal deficiency is less gas" is the basic characteristics of my country's energy, and coal as an important fuel and chemical raw material play an extremely important role in my country's national economic development. [0003] Gasification refers to a series of chemical reactions in coal in a certain temperature and pressure, such as a furnace, such as a furnace, such as a furnace, such as a furnace, such as a furnace. Solid coal is converted to a process of non-combustible gas such as Co, H2, CH4 and other flammable gases and CO2. The gas generated by the gasification is mainly us...

AI Technical Summary

Problems solved by technology

[0007] 1) High energy consumption

Multi-stage flash evaporation causes heat energy loss;

[0008] 2) Waste of resources

Direct discharge of fly ash not only pollutes the environment, but also wastes resources

[0009] 3) Large area and large investment

High-temperature black and gray water requires multi-stage flash evaporation to cool down, which increases the number of equipment; the system process is long, which increases the investment in procurement and construction costs of pipelines, instruments, and civil engineering;

[0010] 4) The process is unstable, and abnormal shutdown occurs, which affects the long-term operation of the gasifier and frequent inspection and maintenance

During the multi-stage flash evaporation process of high-temperature black and gray water, due to the temperature drop and the escape of acid gas, dissolved salts are precipitated, resulting in fouling of subsequent equipment, which affects the long-term operation of the equipment

Images