Gasification furnace annular gap purge gas flow control system

Abstract

The invention discloses a gasification furnace annular gap purge gas flow control system, which belongs to the field of coal chemical industry, and comprises a main path, a bypass, a background calculation unit, a pressure difference adjustment controller and a plurality of pressure detection meters, the rapid feeding of the gasification furnace can generate large economic benefits, the bypass is used for adjusting the flow during the normal operation of the gasification furnace, and the use amount of high-pressure inert gas is reduced and saved; the pressure difference between the annular gap of the first gasification furnace and the air pressure value of the first gasification furnace measured by the plurality of pressure detection meters is calculated in the background calculation unit, and the valve switching workload of field operators can be reduced by the pressure difference adjustment controller according to pressure difference adjustment. The mode that a person opens and closes a hand valve through physical power to adjust the differential pressure is changed into the mode that a central control operator inputs numerical values through buttons and a keyboard on a DCS to achieve automatic adjustment, and rapidness, convenience and safety are achieved.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a gasification furnace annulus purge gas flow control system. Background technique [0002] The pulverized coal gasifier will be filled with high-pressure inert gas in the annulus area to balance the pressure difference between the inside and outside of the water wall and prevent coal ash from flowing back into the annulus area. The existing conventional process is that the high-pressure inert gas enters the annulus of the gasifier through the front hand valve, the shower guide, the flow control valve, the back hand valve, and the check valve. There are three problems in this process: (1) The flow adjustment method is limited, and the flow can only be adjusted by relying on the front and rear hand valves or regulating valves; (2) When the gasifier is in normal operation, the flow adjustment range is small, and the hand valve is used to adjust the flow rate. , th...

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Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a flow control system for gasifier annulus purge gas to solve the problem of limited flow adjustment methods in the prior art, and when the gasifier is in normal operation, the hand valve Adjustment The flow adjustment process is uncontrollable and the system fluctuates greatly

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