Energy-saving and anti-blocking coal gas washing method

Abstract

The invention discloses an energy-saving anti-blocking coal gas washing method, and belongs to the field of coal chemical industry. The method is characterized in that coal gas discharged from a gasification furnace is fully contacted and wetted with ash water from a high-pressure ash water pump in a venturi scrubber, and then enters a water scrubber for fine washing, black water generated by fine washing enters a flash tank for flash evaporation, steam after flash evaporation enters a flash steam scrubber for heat exchange with low-temperature ash water, non-condensable gas is discharged, and the heated ash water is conveyed to the gasification furnace and the venturi scrubber through a high-pressure ash water pump. Compared with the prior art, the energy-saving and anti-blocking coal gas washing method is simple in process and excellent in washing effect, and has very good popularization and application values.

Description

technical field [0001] The invention relates to the field of coal chemical industry, and specifically provides an energy-saving and anti-clogging gas washing method. Background technique [0002] At present, the crude synthesis gas produced by the pressurized gasifier contains a large amount of coal ash. In order to ensure the stable operation of the subsequent sections, the crude synthesis gas usually needs to be washed with water to remove the coal ash. The existing crude synthesis gas treatment process usually adopts the method of rough washing in the chilling chamber + fine washing in the water washing tower. The washing water needs to be transported to the water washing tower through a high-pressure gray water pump, and the crude syngas is fine-washed in the water washing tower. The final black water is transported to the quenching chamber of the gasification furnace through the quenching water pump, and the crude synthesis gas is roughly washed in the quenching chamber...

AI Technical Summary

Problems solved by technology

The existing technology often uses the black water of the washing tower and tower kettle as the cooling water. Since the black water of the washing tower and tower kettle absorbs part of the heat of the crude synthesis gas, the water temperature is relatively high, and the cooling effect is poor when it is used as the cooling water of the downcomer, and it cannot be used for the downcomer. Tubes improve effective protection, and down tube burn-through accidents often occur

[0005] 3. High energy consumption

[0006] In order to solve the above-mentioned deficiencies in the prior art, the patent document with the publication number CN107033967A discloses a coal gasification equipment with heat recovery function, which requires a large amount of washing water to be added to the water washing tower, high power consumption, and poor washing effect , the content of gas particles in the water washing tower is high, which may easily cause dust accumulation and blockage of the gas delivery pipeline

The patent document with the publication number CN107033967A discloses a coal gasification system, which adopts the washing method of chilling chamber + Venturi scrubber + separation tank + tray type water washing tower, and there are many problems that the equipment is easy to block and the system resistance is too large question

Images