Plugging Method of Drain Pipe of Carbon Washing Tower in Coal-water Slurry Gasification Process

Abstract

The invention discloses a blocking removal method for a water discharge pipe of a carbon washing tower in the coal-water slurry gasification process. According to the method, the water discharge pipe is connected, between a discharge valve and a flow meter, with a flushing pipe communicated with a carbon washing tower water supplement pipeline; before a gasification system is started, the discharge value and a side discharge value are closed, and a carbon washing tower water discharge regulating valve group is opened, so that high pressure ash water flows into the water discharge pipe, and then into a high pressure flash tank through a main water discharge pipe via the flow meter and the carbon washing tower water discharge regulating valve group; when the liquid level of a gasification furnace is established, the carbon washing tower water discharge regulating valve group is closed, the discharge valve is opened, and high pressure ash water enters the carbon washing tower through the discharge valve; when the differential pressure of the carbon washing tower and the main water discharge pipe of the carbon washing tower reaches 1.0-4.0 MPa, the carbon washing tower water discharge regulating valve group is opened, when the flow meter reaches the maximum scale value, a stop valve of the flushing pipe is closed, and the blocking removal process is ended. According to the blocking removal method, as high pressure ash water is taken as the flushing water, the differential pressure is high, the flow rate is high, an excellent flushing effect can be achieved, excess water does not need to be added into the system, the safe and stable operation period of the gasification system can also be prolonged.

Description

technical field [0001] The invention relates to a carbon washing tower used in a coal-water slurry gasification process, in particular to a method for flushing and blocking a drainpipe of a carbon washing tower in a coal-water slurry gasification process. Background technique [0002] In the coal-water slurry gasification process, the carbon scrubber is mainly used to wash the saturated syngas at the outlet of the gasifier, remove the dust in the syngas, and make the dust content of the syngas at the outlet of the carbon scrubber ≤1mg / Nm 3 , and recover the heat and the water carried by the syngas. The supplementary water of the carbon scrubber comes from the high-pressure gray water of the slag water treatment system. The black water obtained after washing the syngas in the carbon scrubber is sent to three places respectively: one is sent to the quenching ring of the gasifier through a chilled water pump as Chilled water; one is sent to the venturi scrubber through the chi...

AI Technical Summary

Problems solved by technology

To sum up, if the carbon washing tower cannot drain normally, it will affect the long-term safe and stable operation of the gasification system

At present, there is no mature method for dredging the drainpipe. Field operators usually use a sledgehammer to hit the pipeline after the drainpipe is blocked, and dredge it by vibration. This method is time-consuming, laborious and ineffective.

In addition, after the system is shut down, there will be a lot of dust accumulation inside the carbon washing tower, which makes the cleaning work more difficult and time-consuming

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