A control method for a positive pressure explosion-proof system

Abstract

The invention discloses a positive pressure explosion-proof system control method and belongs to the technical field of explosion prevention. After a first air source fan and a first electric valve are started, only when the concentration detected by each first gas detector is smaller than a first preset concentration, the concentration detected by the second gas detector is smaller than a secondpreset concentration, the pressure detected by the first pressure detector is smaller than a first preset pressure and / or the pressure detected by the second pressure detector is smaller than a secondpreset pressure, the concentration detected by the second gas detector is smaller than the second preset concentration; if not, a second air source fan is started, and a second electric valve is started; when the concentration detected by the at least one first gas detector is greater than or equal to a first preset concentration or the concentration detected by the second gas detector is greaterthan or equal to a second preset concentration, an alarm is given and the working device is turned off. According to the method, air can be supplemented through the second air source fan, continuousair supply of the air supply unit is ensured, the explosive gas concentration of air inlets of the two air source fans and the explosive gas concentration in the positive-pressure explosion-proof cavity are detected, and potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to the field of explosion-proof technology, in particular to a control method for a positive pressure explosion-proof system. Background technique [0002] With the rapid development of my country's industry and the increasing scale of production, such as in petroleum, chemical and other dangerous sites, positive pressure explosion-proof systems are more and more widely used in explosive hazardous sites, such as for working devices such as magnetic levitation blowers. Explosion protection. [0003] The gas supply of the existing positive pressure explosion-proof system mostly adopts on-site gas supply, but the stability of the on-site gas supply is difficult to guarantee, and there is explosive gas on site, which affects the safe operation of the positive pressure explosion-proof system and poses a safety hazard. Contents of the invention [0004] The purpose of the present invention is to provide a positive pressure explosion-p...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a positive pressure explosion-proof system control method to solve the problems in the prior art that the stability of on-site gas supply is difficult to ensure, and there is explosive gas on site, which affects the safe operation of the positive pressure explosion-proof system. security risks

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