Safety shutdown interlocking of Texaco gasification furnace

Abstract

The invention relates to the field of coal chemical industry, in particular to a safety shutdown interlocking of a Texaco gasification furnace. The safety shutdown interlocking monitors and controls the operation process of the gasification furnace through inlet pressure of a coal paste pump, and adopts two-in-three logic control over the inlet pressure of the coal paste pump. The invention solves the accidents of peroxide of the gasification furnace and peroxide explosion caused by big coal paste viscosity, poor flowability and blockage of the inlet of the coal paste pump. The interlocking has high accuracy and flowability, and is safe and reliable.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a safety trip interlock of a Texaco gasifier. Background technique [0002] The Texaco gasification process is a relatively mature raw coal gasification technology, which is characterized in that raw coal is ground into a slurry, and pure oxygen undergoes an incomplete oxidation reaction under high temperature and high pressure in a certain proportion in the gasifier. Produced mainly with CO, H 2 The crude gas which is the effective gas is used as the raw material gas in the subsequent section. Because the reaction conditions and the characteristics of raw materials are relatively harsh, it is easy to cause peroxygen explosion accidents, so there are safety shutdown interlocks such as high oxygen-coal ratio and low coal slurry flow rate. However, the above two safety shutdown interlocks are reliable. The reliability depends entirely on the accuracy and stability of the coa...

AI Technical Summary

Problems solved by technology

Because the reaction conditions and the characteristics of raw materials are relatively harsh, it is easy to cause peroxygen explosion accidents, so there are safety shutdown interlocks such as high oxygen-coal ratio and low coal slurry flow rate. However, the above two safety shutdown interlocks are reliable. The reliability depends entirely on the accuracy and stability of the coal slurry flowmeter. However, due to the limitation of the characteristics of the coal slurry itself, its flow rate fluctuates frequently, and the coal slurry is easy to deposit at the coal slurry flowmeter, resulting in a large flow deviation. According to the usage situation in the industry in 2019, the electromagnetic flowmeters such as Cologne, Yokogawa, Kaifeng Instrument Factory, and Shanghai Weitai all have the above disadvantages. In order to improve the stability of the flowmeter, the damping time has to be increased, but it is not enough. The point is that when the inlet of the coal slurry pump is suddenly blocked, so that the coal slurry pump does not measure, the flow rate at the outlet of the coal slurry pump cannot be reduced in time due to the long damping time, so the high oxygen-to-coal ratio and low coal slurry flow rate will stop the machine safely. The safety and reliability of the interlock is greatly reduced. In the industry, after the inlet of the coal slurry pump was suddenly blocked, the safety stop interlock was not triggered in time, resulting in a system overoxygen accident.

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