Implementation of the strictest standard for oil fume purification in Beijing

At the beginning of the new year, many restaurants, fast-food restaurants and canteens in Beijing have successively completed the renovation of lampblack equipment, introduced new high-voltage electrostatic photolysis equipment for lampblack purification, and further improved the emission standards of lampblack. Cooking fume pollution has always been an important component of urban air endogenous pollution. According to the previous research of the Institute of Atmospheric Physics of the Chinese Academy of Sciences on the causes of smog pollution in Beijing Tianjin Hebei University, the catering emissions in Beijing accounted for about 14% of PM2.5 sources. From January 1 this year, the third standard of air pollutants for catering in Beijing was officially implemented. The emission limit of lampblack was reduced by half, and a new non methane total hydrocarbon would also be strictly restricted. "The non methane total hydrocarbon will be rapidly photolysis and transformation in the air, and become one of the main sources of PM2.5 pollution in the oil smoke and waste gas."

The urban construction department is responsible for the explanation of the staff in charge of the renovation of the oil fume purification equipment. Since this year, the content of non methane total hydrocarbon in the exhaust gas of cooking fume has been strictly limited, and the maximum allowable emission concentration of cooking fume has also been reduced from 2 mg / m3 to 1 mg, 50%. It is understood that the number of purification equipment to be installed in restaurants is related to the amount of air discharged. "The standard air volume of a single stove is calculated by 2000 cubic meters per hour, and the cost of single air volume transformation is several yuan. In general, the air volume of restaurants is between thousands and tens of thousands. For restaurants that produce more cooking fumes, they need to choose better purification equipment. " Beijing Economic and Technological Development Zone City Operation Bureau in charge of catering fume transformation staff said. In order to meet the new standards, many large-scale catering units began to reform the fume purification equipment in the second half of last year.

A staff member of an oil fume equipment manufacturer said, "most of the equipment replaced this time is based on the working principle of high-voltage static electricity. When the oil fume and particles in the exhaust gas pass through the electric field, they are smashed to realize the front-end purification, while the end purification mainly uses the mercury lamp to remove the non methane total hydrocarbon components in the oil fume exhaust gas." Roast duck, barbecue and Sichuan cuisine are the food and beverage industries with more serious smoke pollution. The main businesses in Jijie, which are spicy crawfish, barbecue and hotpot, have started the renovation of the equipment of cooking fume since August last year. According to the relevant person in charge of the chamber of Commerce, 90% of more than 110 restaurants in the street have completed construction, and the remaining 10% are waiting for the manufacturers to carry out renovation. In addition to large-scale chain restaurants, many time-honored restaurants, Chinese and Western restaurants and fast-food restaurants, canteens of government departments and state-owned enterprises, and even cafes that supply fried food such as chips and chicken pieces, are all involved in the "fume purification revolution".

By the end of November 2019, more than 50 Direct stores under Huatian Group, including tongheju, tongchunyuan, eryouju, Di'anmen Makai restaurant and Qingfeng Baozipu, have completed the upgrading and transformation of fume purification. At present, more than 14000 catering enterprises in Beijing have completed the upgrading of the standard of lampblack and achieved the standard emission. The new standard not only limits the pollutant content, but also cleans the equipment more frequently. According to the regulations, the purification equipment shall be maintained regularly. In principle, the filter material shall be cleaned, maintained or replaced at least once a month to ensure that there is no obvious oil stain at the outlet and surrounding of the exhaust funnel. The environmental protection department requires that every oil fume purification equipment should be equipped with data acquisition equipment, which can monitor whether the purification equipment is normally opened in business hours through voltage, current and other indicators. The relevant departments will carry out regular spot check on the pollutant concentration of the exhaust gas discharged by the catering units, and will check the cleaning records of the fume purification facilities of the catering units. If they fail to meet the standards, they will face a fine ranging from 5000 yuan to 50000 yuan.