In the industrial field, because the chemicals involved vary greatly, different BW fixed safety monitoring devices can be equipped according to the specific chemical or chemical gas that the factory contacts.
Petrochemical
More than 80% of the petrochemical industry's production areas are inflammable and explosive. The “Code for the Design of Detection and Warning of Combustible Gases and Poisonous Gases in Petrochemical Enterprises†stipulates that the radius of the plane of coverage of gas detectors shall be 7.5 meters for indoor and 15 meters for outdoor. Within the effective coverage area, at least one detector should be set. In addition, detectors should be installed in the positions near the inlet and outlet valve groups of the tank and in the pump room, compressor room, and bottle filling valve group where leakage gas may be present.
In most cases, it is necessary to monitor whether the flammable gas leaks with BWLEL or IR. BWLEL or IR implements secondary alarms. When the combustible gas concentration in the tested area reaches 10% LEL (LEL, the lowest explosion limit) or 20% LEL, the monitor emits a primary or secondary alarm. Alarm limits can also be adjusted according to user requirements.
For production processes that involve toxic and hazardous volatile organic compounds such as benzene, toluene, aniline, carbon disulfide, etc., BWPID should be used to monitor for leaks. For the detection of benzene leakage in petrochemical plants such as styrene, a BWPID with a UV lamp energy of 9.8 eV can be used. BP's Texas refinery in Texas, USA, used a BWPID of a 9.8eV UV lamp to monitor and report benzene leaks on the production floor. In the monitoring process that lasted more than half a year, BW PID accurately and effectively alerted the benzene leakage accident that occurred during the period.
Metallurgical industry
Metallurgical industry, especially steel smelting, uses industrial gas as fuel. Due to the high CO content of blast furnace gas, converter gas, and coke oven gas, CO poisoning accidents or explosions may be caused by the lack of CO and flammable gas leak detection. The safety inspection of iron and steel enterprises is based on the use of BWLCO, which monitors the toxicity of CO, and BWLEL, which has a total concentration of flammable gases. Monitoring the concentration of toxic gases and flammable gases can track changes in the gas concentration in the environment. If the gas reaches a certain concentration, the instrument can send out an alarm signal to warn that there are leaked gases in the vicinity of the surrounding personnel. It should immediately evacuate and take emergency measures to avoid further development of the situation and accidents such as poisoning or explosion.
Tobacco industry
Before tobacco is stored, it must be sterilized by fumigation to prevent heat and mildew and insect infestation. So far, the commonly used fumigants in the tobacco industry are phosphine and methyl bromide. Fumigation insecticide commonly used agents harmful to humans, and most flammable, improper operation, can cause poisoning and even burning of fumigation insecticides.
BWPH 30~1000ppm can effectively monitor the fumigation process of PH3 as fumigant to ensure the disinfection and insecticidal effect; BWPH 30~20ppm can detect the concentration of residual gas to ensure that there is no residue of toxic fumigant after fumigation. For methyl bromide fumigation, BWIR can be used to monitor the concentration of hydrogen bromide during fumigation and BWPID to monitor residual and leakage of fumigation hydrogen bromide gas.
Water treatment industry
Whether it is drinking water treatment, ordinary tap water treatment, or waste water treatment, it requires the use of disinfectants to oxidize and sterilize microorganisms, bacteria, and chemicals in water. At present, the most widely used disinfectants in domestic water plants and drinking water plants are liquid chlorine and chlorine dioxide. Because chlorine and chlorine dioxide themselves are toxic to the human body, their TWA is: 0.5ppm and 0.1ppm (NIOSH), so the application of BWCl2, BWClO2 detection of chlorine and chlorine dioxide leakage, so as to avoid leakage caused by personal poisoning accidents. In wastewater treatment, organic matter may oxidize or decompose to produce methane, carbon monoxide, carbon dioxide, and hydrogen sulfide. BWCl2, ClO2, CO, and H2S are also commonly used in water treatment plants.
Pharmaceutical Industry
In the pharmaceutical industry, as many raw materials and intermediates are flammable, explosive or toxic chemicals, chemical plants also need to monitor the leakage of toxic or hazardous or inflammable and explosive gases in the pharmaceutical process. BWPID is used to monitor various volatile organic compounds, BWLEL or IR is used to monitor flammable gases, and BWCO, H2S, SO2, NO2, etc. are used to detect various toxic gases involved in the production process.
Food Industry
In the food industry, gases such as ClO22, CO2, and O2 need to be used for sterilization, preservation, and other processes. At these process sites, the concentration of these gases must be measured with a corresponding fixed BW instrument to perform process control or leak monitoring.
In addition, BW equipment can be effectively used in the pesticide industry, semiconductor industry, and customs inspection.
Quoted from Modern Career and Safety
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Wenzhou Kangyuan Electronics Co Ltd , https://www.kangyuanelectronic.com