At present, my country's more mature fixed pollution source VOCs monitoring and detection method is an offline detection method. The samples to be tested are collected on-site through sampling bags or sampling tubes, and then analyzed by testing agencies. This kind of sampling-offline detection can only understand the precise concentration of the gas sample to be tested, and cannot monitor the emission concentration of exhaust gas from a fixed pollution source in real time. In addition, during the sampling-offline detection process, gas sample concentration attenuation, pollution, etc. may occur, resulting in a certain difference between the analysis result and the actual situation. Therefore, compared to the sampling-offline detection method, the online VOCs monitoring technology is more time-sensitive, and it can reflect the VOCs emission of pollution sources more truthfully and accurately. With the continuous advancement of VOCs online monitoring technology, the current VOCs online monitoring methods in my country mainly include spectroscopy, mass spectrometry, chromatography and sensor technology. Various technologies have their own advantages and disadvantages in different fields and conditions of use. (1) Spectroscopy technology Spectroscopy technologies used for online monitoring of VOCs mainly include Fourier Transform Infrared Absorption Spectroscopy (FTIR), Differential Absorption Spectroscopy (DOAS) and Tunable Laser Absorption Spectroscopy (TDLAS). Passive Fourier transform infrared spectroscopy (PFTIR), open optical path long optical path Fourier transform infrared spectroscopy technology (OP-FTIR) and open optical path long optical path ultraviolet differential absorption spectroscopy (UV-DOAS) online monitoring mainly through Open the optical path long optical path (100 ~ 1000m) spectrometer to monitor the pollution plume passing through the optical path. OP-FTIR can monitor hydrocarbons and MTBE and other refining characteristic VOCs, UV-DOAS is suitable for monitoring benzene series, phenols and photochemical products-ozone, etc. The more mature online monitoring technology for the unorganized emission of VOCs at the plant boundary of petrochemical enterprises is the open optical path long optical path spectroscopy. OP-FTIR and UV-DOAS have a large number of applications in the emission monitoring of hydrocarbons and benzene series at the plant boundary, and can be qualitatively and quantitatively measured. The monitoring response time of VOCs in the polluted plume passing through the optical path is shorter, and the monitoring result is the average concentration of the path. TDLAS technology is a laser spectroscopic analysis method established and developed by using the characteristics of high laser power density and large photon flux. The technology has high sensitivity, good selectivity, real-time and dynamic properties. TDLAS technology can monitor VOCs at ppm or even ppb level within 1s of detection time. In addition, this t...

The dust filter bag has a wide application space and has been widely used in electric furnace steelmaking, blast furnace coal injection, sintering, fire resistance, carbon black, cement and other industries, and has achieved good results. The electric furnace filter has good advantages and is very strong in terms of cleaning ability and filtration load compared with other products of the same type. Since the injection of pulverized coal can replace part of coke, achieving coal-based coke can significantly reduce coke consumption, thereby reducing production costs, and is also one of the hands to adjust the furnace condition and ensure smooth, stable production and high production of the blast furnace. In the process of developing a large number of coal injection technology. The use of the pulverized coal preparation system (large pulverizer) results in the generation of a concentration of 600-1 0009/Nm' pulverized coal and a part of ultrafine pulverized coal. Because the penetration and penetration of pulverized coal are higher than ordinary powder, it can not be collected with ordinary filter materials, which will cause leakage. Penetration and so on. 1. The pulverized coal particles penetrated the environment greatly. The diaphragm is used to prevent the leakage of the filter material, and the hub can achieve the desired result. Wei Zhoujiang membrane filter. Increase the resistance of the winding. Affected production. For coal injection in the blast furnace. Coal dust and other system dust source t high dust concentration, fine dust particles, high dust resistance, high explosive. Dust is easy to produce leakage powder and dust leakage. 1. Advantages of Stable antistatic filter cloth The strength is higher: the high-strength and low-stretch industrial yarn is used as the base fabric, the needle density is high, and the fiber is tightly cohesive, so that the strength is greatly improved. The pore size is smaller: the fine fiber is generally selected, the fiber diameter is reduced several times, the diameter of the L is reduced, the porosity is increased, and the filtration precision is improved. Lower elongation: the felt fibers are tightly packed and have a high density, which greatly reduces their elongation. High-strength low-stretch fibers are used as the base fabric to make the elongation less. High acid and alkali resistance: high-molecular-weight polyester grade fiber, acid-base and hydrolysis resistance are improved due to the direct spinning process. More wear-resistant, folding resistance: due to the high strength of the filter felt, the number of fibers per unit volume is high, the density is high, the wear is strong, and the service life is longer. High uniformity: several times of opening and loosening and fine combing make the fiber web more uniform, so that the whole of the filter felt is uniform and the surface is flat. Smooth surface: due to the uniform surface, the fibers are fine and dense, and the surface can be calendered t...

As an important precursor of PM2.5 and ozone, VOCs emit much higher than sulfur dioxide and nitrogen oxides, and are extremely harmful to the atmospheric environment and human health. With the deepening of our country's air control work, the control of VOCs pollution is very difficult. The results of the national air quality forecast consultation in the first half of September were announced: light to moderate ozone pollution may occur in the Yangtze River Delta, and the prevention and control of VOCs gas pollution is even more urgent. National policies for VOCs have been continuously introduced, and local governments have also intensively launched VOCs gas governance and monitoring policies and regulations.     (1) National level    In June 2010, the Ministry of Environmental Protection, the National Development and Reform Commission, the Ministry of Science and Technology, the Ministry of Industry and Information Technology, the Ministry of Finance, the Ministry of Housing and Urban-Rural Development, the Ministry of Transport, the Ministry of Commerce, and the Energy Administration jointly issued the "Regarding the Promotion of Joint Prevention and Control of Air Pollution" "Guiding Opinions on Improving Regional Air Quality", volatile organic compounds are listed as one of the four air pollutants that need key control.    In December 2011, the Ministry of Environmental Protection issued the "Twelfth Five-Year Development Plan for National Environmental Protection Standards", emphasizing the strengthening of the control of volatile organic pollutants and toxic waste gas, and officially proposed to control the emission of volatile organic pollutants, and clearly proposed to carry out volatilization. Monitoring of sexual organic pollutants.    In September 2013, the State Council issued the "Air Pollution Prevention and Control Action Plan" to promote the control of volatile organic compounds, increase the collection of pollution fees, and include volatile organic compounds in the scope of the collection of pollution fees.    In July 2014, the State Council’s "Measures for the Assessment of the Implementation of the Air Pollution Prevention and Control Action Plan (for Trial Implementation)" stipulated the progress of the national air volatile organic pollutants control. At this point, the treatment of atmospheric volatile organic pollutants has begun, and the monitoring has officially started.    In December 2014, the Ministry of Environmental Protection issued the "Comprehensive Remediation Plan for Volatile Organic Compounds in the Petrochemical Industry". By 2017, the national petrochemical industry has basically completed the comprehensive remediation of VOCs and established a VOCs monitoring and monitoring system. The total VOCs emissions will be reduced by more than 30% compared with 2014.       In June 2015, the Ministry of Environmental Protection issued the "Vol...

The main technological process of the needle punched non-woven filter material for bag filter is: opening-mixing-fine opening-carding-netting-needle punching-finishing-slitting bag making. The fiber opened by the bale opening machine is much looser than the fiber bale, but it still cannot meet the requirements of uniform mixing and opening degree. It is necessary to further use the blending box to mix and open the raw materials. The purpose of the blender is to fully open and mix the raw materials. According to the configuration and form of the equipment, the mixing box type is generally divided into a large warehouse cotton mixing machine, a multi-bin cotton mixing machine and a semi-automatic cotton mixing machine. The big warehouse cotton blending machine takes the fiber that has been unpacked by the bale opener, and sends the fiber through the pipe to the cotton outlet of the cyclone separator at the top of the cotton storage bin under the action of the fan. °Rotate and reciprocate along the longitudinal center of the cotton storage bin at the same time, and the ejected fibers are evenly thrown and accumulated layer by layer. Yuanchen Technology always pays attention to product quality and quality first, and invests in the introduction of advanced Autefa acupuncture production line from Germany for the production of acupuncture filter materials. The production line is equipped with two large warehouse cotton blenders to realize the full mixing of the upper and lower fiber materials of the filter material, and make full preparations for the quality of the final product.

VOCs advanced treatment technology and process-efficient and reasonable treatment process system

Main technology and equipment① Adsorption technology: solvent adsorption recovery (activated carbon/activated carbon fiber adsorption device); adsorption concentration device (zeolite runner/honeycomb activated carbon) Thermal incineration technology: RTO/TO/TNV Catalytic combustion technology: RCO/CO The above-mentioned processes and equipment have the widest range of application, the largest market share, and the largest contribution to the reduction of VOCs. They are currently the mainstream technology for VOCs governance. Main technology and equipment② Adsorption technology: pre-treatment (spray tower), post-treatment (activated carbon adsorption + oil gas recovery) Condensation technology: suitable for the purification of high boiling point and high concentration gas, usually other technologies are needed to achieve compliance discharge (such as condensation + adsorption technology) Absorption and condensation technology has a narrow application range, and is usually used in the pre-treatment and post-treatment processes of VOCs. It plays an "auxiliary" role in the combined treatment process, but it is essential for certain industries. Main technology and equipment ③ Biological purification technology is mainly used for exhaust gas deodorization. It is widely used in sewage treatment, garbage treatment, chemical, pharmaceutical, pesticide, food processing and production industries. In recent years, progress has been made in the cultivation of biological strains, biological fillers and biological purification processes, and the scope of application has continued to expand. Biological purification technology has become one of the main technologies for the treatment of organic waste gas. Main technology and equipment④ Low-temperature plasma/photocatalysis/photooxidation technology is a kind of destruction technology. Due to its low purification efficiency (20-50%), it is easy to produce secondary pollutants, so it is usually combined with absorption technology to improve efficiency. It is usually used for the purification of gas odor after reaching the emission standard. This type of technology has received a large number of applications between 2013 and 2018, which has caused great confusion to the market. At present, the "sudden brake" method has been adopted to restrict its use. It is legal to restrict this type of technology to the field of low-concentration odor control in the "Comprehensive Treatment Plan for Volatile Organic Pollutants in Key Industries" in 2019.