Low-noise emptying method for nitrogen replacement of reaction kettle

Abstract

The invention discloses a low-noise emptying method for nitrogen replacement of a reaction kettle. The method comprises the following steps of adding a bypass on an original blow-down pipe, wherein the bypass is provided with a bypass regulating valve and a bypass emptying shut-off valve. The bypass is automatically controlled to carry out a reaction kettle emptying operation by a DCS control system, a DCS automatic control program comprises several steps that the valve opening of the regulating valve on the bypass is controlled step by step to empty, the valve opening of the regulating valveis increased with the number of step, each emptying step has a certain emptying time, the number of emptying step, the opening size of the regulating valve of each step and the setting of each emptying time depend on the overall emptying time and the actual situation of the emptying noise. According to the invention, the bypass emptying operation is controlled by the DCS control system, so that the emptying process is more stable, the noise is less, the influence of the noise on workers and the environment is reduced, and the problem that large noise is generated by directly emptying in the prior art is effectively solved.

Description

technical field [0001] The invention relates to the technical field of venting for nitrogen replacement of reactors, in particular to a low-noise venting method for nitrogen replacement of reactors. Background technique [0002] Combustible gas and air (or oxygen) are evenly mixed within a certain concentration range to form a premixed gas, which will explode when encountering a fire source. For example: hydrogen is an extremely flammable and explosive gas. When the volume fraction in air is 4%-75%, it can cause an explosion when it encounters a fire source; carbon monoxide is a flammable and explosive gas that mixes with air It can form an explosive mixture. When the volume fraction in air is 12%-74.2%, it can cause combustion and explosion in case of open flame and high temperature. Therefore, before this type of flammable and explosive gas is passed into the reactor for reaction, it must be replaced with nitrogen, and the air in the reactor must be replaced with nitrogen...

AI Technical Summary

Problems solved by technology

However, when the reaction kettle is replaced with nitrogen, the pressure in the kettle is relatively high, forming a large pressure difference with the air pressure, and when the vent valve is suddenly opened for venting, huge noise will be generated.

[0004] Noise is a kind of pollution, which will bring great harm to the staff and the surrounding environment, mainly reflected in: ① Noise will have a certain harmful effect on people's hearing. If people are in a high noise pollution environment for a long time, they will It will cause hearing loss, piercing, tinnitus and deafness; ② Noise will cause the staff to be unable to concentrate on work, emotional irritability, agitation and slowness; ③ Loud noise will affect the normal communication and communication of the staff, It is not conducive to the orderly development of work; ④ Noise will also affect the sleep and rest of the staff and surrounding residents, and long-term fatigue work is not conducive to the safe operation of production

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