Method for enabling smoke detection and alarm system to be used in phosphine environment

An alarm system, phosphine technology, applied in the direction of alarms, fire alarms, scattering characteristics measurement, etc., can solve the problem of unusable fire detection alarms, etc., and achieve the effect of simple structure and convenient operation
CN102054325BInactive Publication Date: 2012-04-18็งฆ็ง‘้›
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
็งฆ็ง‘้›
Publication Date
2012-04-18
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a method for enabling a smoke detection and alarm system to be used in a phosphine environment, namely, a method for thoroughly eliminating the possibility that PH3 corrodes metal parts of a smoke detection and alarm system by adopting four protective screens. The method comprises the following steps: (1) adopting an air-sampling high-sensitivity smoke detection and alarm system which can be arranged away from a phosphine scene; (2) feeding only 5 percent of air samples into a detection cavity, and directly discharging the residual 95 percent of air samples; (3) coating the metal parts of the smoke detection and alarm system with epoxy resins; and (4) carrying out catalytic oxidation absorption and separation on the metal parts in a negative-pressure reaction separator by using Pd (II)-Fe (III) liquid-phase catalytic oxidizing agent or efficient calcium-hypochlorite bleach solution. The method provided by the invention has the advantages of high reliability, simple process and equipment, cheap and easily-obtained catalytic agent and absorbent, high absorption efficiency and capability of improving the smoke detection performance, and is convenient to operate, therefore, the method can be widely applied to fire detection alarms in a strong corrosive phosphine environment.
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Description

technical field

[0001] The invention relates to a method for enabling a smoke detection and alarm system to operate normally for a long time in an environment containing phosphine gas which has a strong corrosion effect on metal objects such as copper. In particular, it relates to a solution that phosphine gas produced by aluminum phosphide fumigation and insecticide has a strong corrosion effect on metal objects such as circuit boards and electronic components of fire detection and alarm equipment.

[0002] At present, aluminum phosphide tablets are used to kill insects in tobacco leaf storage warehouses, medicinal material storage warehouses and grain storage warehouses, which have been widely used because of their high insecticidal efficiency and economical convenience. When aluminum phosphide encounters water in the air, it will decompose and produce phosphine gas, which is highly toxic and has a strong corrosion effect on metal objects. Each gram of aluminum phosphide tab...

Claims

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