Method for detecting and controlling oxygen content in coal gasification production process

Abstract

The invention discloses a method for detecting and controlling oxygen content in a coal gasification production process, is particularly suitable for control of the oxygen content in ammonia and methanol synthesis production. Because an oxygen content control system is a large time lag system, the control of the large time lag system is difficult in a control process. According to the method disclosed by the invention, a sampling point for oxygen content analysis is moved forward to a starting point, namely an outlet of a single coal gas producer, at which the oxygen content in coal gas is triggered to rise; a buffer water distributor for small-sized instruments and refining and purifying devices for drying and desulfurating gas are designed and arranged; an oxygen content analyzer is utilized and is provided with a terminal connected with a DCS (Discrete Control System); the DCS is combined with technologies of automatic control and safety interlocking so as to realize automatic alarm and safety interlocking, so that the difficult problem of high oxygen content caused by deteriorated single furnace conditions and valve faults is solved thoroughly; and the method is a breakthroughtechnological innovation for the safety production and stable production in chemical industry. According to the invention, afterward passive control is changed into beforehand active control, so thatthe problems of time lag are reduced and the requirement on intrinsic safety is met.

Description

technical field [0001] The invention relates to a method for detecting and controlling the oxygen content in the coal gasification production process, such as a method for detecting and controlling the oxygen content in the production process of synthetic ammonia and methanol. Background technique [0002] In the synthetic ammonia production process of fixed bed gasification to produce raw material gas, the oxygen content in synthetic ammonia and methanol production raw gas is an important parameter in the production of synthetic ammonia and the first control index that affects system safety. The process index issued by the former Ministry of Chemical Industry is: O 2 ≤0.5%, once the oxygen content exceeds the standard, it is easy to cause an explosion accident. In order to ensure safe production, the practice in the industry at home and abroad is to use the oxygen analyzer to set the monitoring point of oxygen content on the outlet pipeline of the gas cabinet or the outlet...

AI Technical Summary

Problems solved by technology

[0003] In the traditional technology, if the oxygen content in the raw material gas exceeds the standard, the traditional monitoring method will cut off all the gas generators, stop the production system, and vent a large amount of gas, resulting in a waste of resources

However, it is very difficult to find the reason for the excessive oxygen content in several furnaces. It is often judged by experience, coupled with nervousness, it is easy to cause misjudgment, poor accuracy, and takes a long time, which poses a great threat to production safety.

If the oxygen content seriously exceeds the standard or the treatment is not timely, it may cause a system explosion in the gas system, resulting in serious consequences

Even if the cause is found out and the fault point is eliminated, the inert gas replacement system must be turned on again to gradually transfer to normal production, which prolongs the cycle of troubleshooting and affects the normal production

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