Due to the complex composition and emission conditions of the process VOCs, in order to achieve efficient and advanced treatment of VOCs-containing exhaust gas, the exhaust gas needs to be pretreated under certain working conditions. The exhaust gas pretreatment mainly affects the VOCs composition, pollutant concentration, temperature, humidity and Adjust the particulate matter. The "Technical Specification for Industrial Organic Waste Gas Treatment Engineering by Adsorption Method (HJ 2026-2013)" requires that the concentration of organic matter in the organic waste gas entering the treatment device (adsorption, incineration, catalysis, etc.) is less than 25% of its lower explosive limit. When the concentration of organic matter in the exhaust gas is higher than 25% of its lower explosive limit, it should be reduced to 25% of its lower explosive limit before purification. For example, when the adsorption concentration (activated carbon, zeolite runner) + RTO, RCO treatment process is adopted, the concentration of waste gas during the desorption process needs to be controlled. The exhaust temperature of the vulcanization process is about 60-70°C. If activated carbon adsorption and low-temperature plasma are used for treatment, the temperature needs to be reduced to below 40-50°C. For physical adsorption, the lower the temperature, the better the adsorption. For compounds with low boiling points, the temperature effect is particularly obvious. For adsorption, catalysis, and incineration devices, the lower the humidity, the higher the purification efficiency. The relative humidity of the exhaust gas has a great influence on the adsorption performance of activated carbon and zeolite molecular sieve. The main methods of exhaust gas dehumidification include: demister and dehumidification by demister (mainly for spray system); condensation and dehumidification; heating and dehumidification (improving the adsorption capacity of adsorbent materials such as activated carbon); adsorption dehumidification (continuous dehumidification device with zeolite rotor) ). The control of particulate matter is also very important. The content of particulate matter entering the adsorption device should be less than 1mg/m3, and the content of particulate matter entering the incinerator should be less than 10mg/m3. Low-temperature plasma, photooxidation, and biological devices have stricter requirements for particulate matter. For example, paint mist particles are difficult to purify spray waste gas due to their high viscosity and can be removed by dry filtration; the waste gas of rubber products refining process contains high concentration of dust, which needs to be efficiently filtered through a cloth bag before entering the subsequent VOCs treatment equipment. The main methods of particle removal are: mechanical filtration technology (wire mesh filter element, filter felt, filter box, etc.); dry high-efficiency filtration technology, wet filtration technology (Venturi...

This measure is aimed at the serious unorganized dissipation of VOCs, and the effective collection of exhaust gas is a prerequisite for in-depth treatment. Article 45 of the Air Pollution Prevention and Control Law: Production and service activities that produce exhaust gas containing volatile organic compounds shall be carried out in confined spaces or equipment, and pollution prevention and control facilities shall be installed and used in accordance with regulations. Enclosed equipment and enclosed spaces are all enclosed collection systems, including enclosed areas or enclosed buildings formed by using a complete enclosure structure to block pollutants, workplaces, etc. from the surrounding space. In enclosed areas or enclosed buildings, except for the entry and exit of personnel, vehicles, equipment and materials, as well as exhaust pipes and vents established by law, doors, windows and other openings (openings) should be kept closed at all times.  If it cannot be sealed, measures shall be taken to reduce exhaust gas emissions. The exhaust hood belongs to a local gas collection system. A reasonable exhaust hood is designed according to the characteristics of the discharge point, and the suction wind speed is controlled to improve the collection efficiency.

Yuanchen Technology (hereinafter referred to as "our company") cement kiln flue gas denitrification catalyst was officially put into operation on the 1# line (5000t/d) of XXX Conch Cement Co., Ltd. Chaohu Conch Cement 1# line SCR denitration is a high temperature and high dust process. Our company has recently completed a return visit to Chaohu Conch Cement. The SCR denitration system is operating stably, the catalyst meets the design requirements of the working conditions, and the NOx emission reaches the standard (the average emission value is less than 50mg/Nm3 ). Since winning the bid for the SCR denitration catalyst project of Chaohu Conch Cement Line 1#, Yuanchen Technology has actively maintained close contact with the engineering company and the owner. The installation and other links are checked at various levels, providing the owners with high-quality products and thoughtful services.  According to the results of the on-site return visit and the feedback from the owner, the special catalyst for cement kiln flue gas denitration produced by our company has not been blocked since it was put into operation. The ammonia consumption is lower, and the pressure difference of the three-layer catalyst is less than 300Pa. On the one hand, the catalysts provided by our company meet the needs of customers for emission reduction of pollutants, and on the other hand, they also help customers achieve energy saving and consumption reduction, and reduce carbon emissions in the production process. Based on the successful application of Chaohu Conch Cement, Yuanchen Technology will continue to provide relevant environmental protection engineering companies and cement manufacturers with high-quality special catalysts for cement kiln flue gas denitration and satisfactory product life-cycle services to help my country The cement industry will achieve the goal of carbon peaking and carbon neutrality as soon as possible.

Yuanchen Technology Biomass Boiler is a boiler that uses biomass energy as fuel. However, although biomass boilers are less polluting than coal boilers, they also produce particulate dust, sulfur dioxide (SO2), nitrogen oxides (NOx), acid gases, etc. during the combustion process, and the generated dust and exhaust gas need to be treated Only then can the exhaust emission standards be reached. Only the SCR denitrification technology can meet the requirements of "ultra-low emission" and be stable for a long time, and solve the problem of alkali metal poisoning in the flue gas denitration of biomass boilers in an all-round way.

Generally speaking, all porous materials that can allow fluid to pass through and trap solid particles contained in the fluid to achieve the purpose of solid-liquid separation are collectively referred to as dust bag filter media. On the one hand, the filter efficiency of the dust bag is related to the structure of the filter material, and on the other hand, it also depends on the dust layer formed on the filter material. Therefore, theoretically, the highest efficiency can be achieved when the filter material is not broken. Therefore, as long as the design parameters are selected properly, the dust removal effect of the bag filter should be no problem. The key points of selecting the bag should meet the following requirements: easy to clean dust, good air permeability, temperature resistance, strong corrosion resistance, etc.

In recent years, with the intensification of global warming, CO2, as the main greenhouse gas, has attracted widespread attention from all over the world. In order to alleviate the problem of global climate change brought about by CO2 emissions, "carbon peak" and "carbon neutrality" were formally proposed this year to achieve "carbon emission reduction". Human factors have led to a significant increase in the concentration of CO2 in the atmosphere. Among them, the CO2 emissions of coal-fired power plants account for about 1/3 of the world. Therefore, it is necessary to take measures to remove a large amount of CO2 in the tail gas of coal-fired power plants.  At present, the industrial methods for removing CO2 from flue gas mainly include traditional techniques such as solvent absorption, membrane separation, pressure swing adsorption, and cryogenic distillation. Fundamental  Membrane absorption method is a new type of separation process that combines membrane separation and ordinary absorption. Microporous membranes are mostly used. In this process, the gas-liquid two phases contact and mass transfer at the fixed gas-liquid interface, and flow on both sides respectively. The membrane itself has no selectivity to gas, and only serves to isolate the absorbent from the gas. CO2 diffuses through the membrane to the liquid side under the action of a concentration gradient. Theoretically, the membrane pores can allow gas molecules separated on one side of the membrane to penetrate to the other side of the membrane without high pressure, and the purpose of separating mixed gases is mainly achieved by the selective absorption of the absorbent.  The basic principle is shown in the figure below (take a hydrophobic porous membrane as an example). The driving force of this technology to achieve gas separation is the interphase concentration difference. The mass transfer process is based on Fick's law and can be divided into the following three steps: ① First, the solute is transferred from the mixed gas to the surface of the membrane pores; ② The solute is then transferred from the membrane pores Diffusion to the gas-liquid two-phase interface; ③The solute eventually reacts with the absorbent and is absorbed into the main body of the liquid phase. Different kinds of membranes for carbon dioxide absorption technology (1)The metal organic framework material (MOF) is compounded with organosilane, and a series of composite gas separation membranes with high flux and high selectivity have been successfully designed and prepared. (2)Selecting microporous polymer (PIM-1) and metal organic framework material (MOF) nanoparticles to develop a new type of carbon dioxide separation membrane material in the form of mixed matrix membranes (MMMs), which has both high permeability and high Selective. (3) The combination of electrospinning, pore formation, hydrolysis reaction and grafting technology successfully prepared a flexible and strong polyethyleneimine ...