The direction of development of denitrification catalysts in the steel industry, the current technology of desulphurisation and dust removal process in steel enterprises has been very mature, and also able to achieve ultra-low emission index requirements, there are also many options in the technical route, but denitrification technology still needs to be developed and improved. According to statistics, in the production process of the steel industry, sintering flue gas process NOx emissions account for about half of the total NOx emissions in steel plants, making the control of NOx in the sintering flue gas has become the focus of environmental management of iron and steel enterprises after dust and desulphurization. According to the requirements of ultra-low emission, the NOx concentration of steel mill sintering machine should reach below 50mg/Nm³. The current main process routes for denitrification of steel mill sintering machines are denitrification before desulphurisation and denitrification after desulphurisation, and denitrification after desulphurisation with semi-dry desulphurisation and denitrification after wet desulphurisation. Selective catalytic reduction (SCR) denitrification technology is the most mature denitrification technology, which is flexible and can be combined flexibly according to the built/unbuilt desulphurisation units, and has a strong ability to adapt to changes in working conditions; denitrification efficiency can reach over 90% or higher, and can achieve ultra-clean emissions; it can simultaneously promote the decomposition of dioxins, without the generation of secondary pollutants; there is no secondary pollution of waste gas and wastewater The system is simple and easy to operate, with high safety and no risk of dust storms. Denitrification catalysts are the key to SCR denitrification technology, and low energy denitrification catalysts that are adapted to the low temperature conditions of the steel industry, resistant to poisoning and anti-clogging are the way forward. At present, according to the different forms of sinter configuration, the post-DSR denitrification processes are: wet desulphurisation + electrostatic dehumidification + GGH + hot air furnace + SCR, semi-dry desulphurisation + cloth bag dust removal + GGH + hot air furnace + SCR, activated carbon desulphurisation and dust removal + SCR denitrification. The pre-DGD denitrification process is mainly electrostatic precipitation + GGH + hot blast furnace + SCR + desulphurisation. I Wet desulphurisation + electrostatic dehumidification + GGH + hot blast furnace + SCR After the flue gas has been wet desulphurised and electrostatically dehumidified, the temperature is about 50-60°C. The low temperature flue gas is warmed up by heat exchange between GGH and the high temperature flue gas from the SCR outlet, then mixed with the high temperature flue gas from the hot air furnace and warmed up to 220-280°C to enter the SCR reactor, and the denitrification fl...

The company is mainly engaged in the research and development, production and sales of filtration materials, flue gas purification series of environmental protection products, the main products are various types of high temperature and corrosion resistant filter bags and SCR denitrification catalysts, which can be applied to power, steel and coking, waste incineration, cement and glass industries. 2017-2021 the company's operating revenue CAGR is 17.11%, the net profit attributable to the mother CAGR is 18.35%. Both filter bags and catalysts have the property of consumables, with an average replacement cycle of 3-4 years. The company's filter bag business strength areas in electricity and waste incineration: the power industry price factor dominates, the company's market share in the top three; in the field of waste incineration, the company is in the market leader, with the largest manufacturer of waste incineration Everbright in-depth cooperation has accumulated a lot of business. The company's catalyst business strength areas are in power, steel and small boilers: the company has the top three market shares in regional power plants and small boilers, and the first market share in the steel industry. Power industry benefits from coal power investment, non-electricity industry accounted for an increase. Electricity is the company's first major business, the electricity stock market is stable, the market size of filter bags and denitrification catalysts is about 2.5 and 5 billion yuan respectively. Under the urgent demand of supply preservation + peak regulation, coal power investment starts to return to growth, and new coal power units are expected to bottom out in the next few years, bringing new installation demand for filter bags and denitrification catalysts in the power industry. Non-electric industries such as steel, cement, waste incineration, flat glass, ceramics and non-electric coal-fired boilers will become the main battlefield for ultra-low emission transformation, providing major increments, especially in the cement track, where provincial and municipal policies have yet to be fully followed up and the overall catalyst transformation rate is less than 10%, leaving a wide space. It is expected that in 2022 the non-electricity industry filter bag, denitrification catalyst market size of about 10, 5 billion yuan, respectively, the company's products from the power industry to the power and non-electricity synergistic development, the current non-electricity industry revenue accounted for more than 50%. With the national environmental protection policy tightening, the competitive ability of weak small and medium-sized enterprises will continue to exit, the company with production capacity expansion gradually landed, the market share is expected to continue to improve. Wide temperature differential catalysts adapted to flexibility retrofits to market. Large-scale access to new energy sources makes the construction of peaking capacity cru...

From 19th to 20th November, Yuanchen Technology Analysis and Testing Centre welcomed the annual CNAS supervision/extension audit. The audit expert group was commissioned by China National Accreditation Service for Conformity Assessment and consisted of Mr. Peng Bin from the Exploration Research Institute of Anhui Coalfield Geology Bureau, Mr. Wang Qixiang from the National Centre for Nanoscience and Mr. Wang Guiling from the Shandong Fiber Quality Monitoring Centre to conduct this review. In addition to the regular supervisory review, the audit focused on the new SCR full-size testing capability of the testing centre, which is the third generation of SCR full-size testing and evaluation platform independently developed by Yuanchen Technology, capable of conducting objective and comprehensive testing and evaluation of the performance and life of the products, greatly enhancing the enterprise's ability to control the quality of catalyst products. Through the strict evaluation of the quality system, technical capability and on-site assessment, the evaluation team considered that the quality management system of the analysis and testing centre of Yuanchen Technology was running well, with a self-improvement and continuous improvement management mechanism, and affirmed the standardized quality management system of Yuanchen Technology. See the river rushing at the top of the mountain; feel the wind swelling at the top of the peaks. The successful passing of this assessment has enhanced the comprehensive strength and core competitiveness of the company in the field of SCR denitrification catalyst inspection and testing. In the future, Yuanchen Technology will continue to adhere to the quality policy of "scientific method, fair behavior, accurate results and customer satisfaction", continuously improve the comprehensive competitiveness of the laboratory, improve product quality and contribute to the high-quality development of the industry.

Denitrification catalysts are the core part of SCR technology and determine the denitrification efficiency and economy of the SCR system, with construction costs accounting for more than 20% of the cost of flue gas denitrification projects and operating costs accounting for more than 30%. In recent years, developed countries such as the US, Japan and Germany have continued to invest large amounts of human, material and financial resources in research and development of high efficiency, low cost flue gas denitrification catalysts, with emphasis on the protection of intellectual property rights in the process of catalyst patent technology, technology transfer and production licensing. The initial catalysts were metal-based catalysts such as Pt-Rh and Pt, with monolithic ceramics such as alumina as the carrier, which had the characteristics of higher activity and lower reaction temperature, but the expensive price limited their application in power plants. Therefore, since the late 1960s, three Japanese companies, Hitachi, Mitsubishi and Takeda Chemical, have developed TiO2-based catalysts through continuous research and development and have gradually replaced the Pt-Rh and Pt series catalysts. The composition of this type of catalyst is mainly composed of metal oxides such as V2O5 (WO3), Fe2O3, CuO, CrOx, MnOx, MgO, MoO3, NiO or a mixture that plays a combined role, usually with TiO2, Al2O3, ZrO2, SiO2, activated carbon (AC), etc. as the carrier, and the reducing agent such as liquid ammonia or urea in the SCR system to reduce It is now the mainstream catalyst for SCR denitrification applications in power plants. There are three types of catalysts: plate, honeycomb and corrugated plate. All three catalyst types have a proven track record in coal-fired SCR, with the plate and honeycomb types being more common and the corrugated plate type being less common. The design of the catalyst is to select a catalyst with a certain reaction area to meet the design requirements of the basic SCR performance such as denitrification efficiency and ammonia escape rate under the conditions of flue gas flow, temperature, pressure and composition at the outlet of the coal economiser; its anti-blocking and anti-wear performance is the key to ensure the long-term safe and stable operation of the SCR equipment in an environment with variable ash conditions. In terms of anti-clogging of ash, for a given reactor cross-section, the plate catalyst has the largest through-flow area for the same catalyst pitch, generally above 85%, the honeycomb catalyst is second with a through-flow area generally around 80% and the corrugated plate catalyst has a similar through-flow area to the honeycomb catalyst. Under the same design conditions, a properly selected honeycomb catalyst with a large pitch can have an anti-clogging effect close to that of the plate catalyst. In terms of structure, the plate catalyst has the smallest number of wall angles and the largest circulation area, mak...

Denitrification catalysts refer to catalyst used in SCR (selective catalytic reduction) denitrification systems in power plants, where the SCR reaction causes a chemical reaction between the reducing agent and the nitrogen oxides in the flue gas selectively at a certain temperature. The most commonly used catalysts are the V2O5-WO3(MoO3)/TiO2 series (TiO2 as the main carrier and V2O5 as the main active ingredient). The current SCR commercial catalysts are basically TiO2 as the carrier, V2O5 as the main active ingredient and WO3 and MoO3 as the antioxidant and anti-toxicant auxiliary ingredients. There are three types of catalysts: plate, honeycomb and corrugated plate. The plate catalyst is based on a stainless steel sheet pressed into a metal mesh, with a mixture of TiO2 and V2O5 adhered to the stainless steel mesh, which is pressed and forged to form the catalyst module. Honeycomb catalysts are generally homogeneous catalysts. The mixture of TiO2, V2O5, WO3, etc. is passed through a ceramic extrusion equipment to make catalyst elements with a cross section of 150mm X 150mm and varying lengths, which are then assembled into standard modules with a cross section of approximately 2m X 1m. The manufacturing process for corrugated plate catalysts is generally based on TiO2 reinforced with glass fibres and the active ingredients such as WO3 and V2O5 are impregnated onto the surface of the catalyst to increase the catalyst activity and reduce the SO2 oxidation rate.

The material for dust collector bags is synthetic, natural or glass fibre woven into cloth or felt. The cloth or felt is then sewn into cylindrical or flat filter bags as required. Depending on the nature of the flue gas, the filter media is selected to suit the application conditions. Usually, in the case of flue gas temperature below 120°C, the filter media is required to have acid resistance and durability, often using polyester fleece and polyester needle felt; in dealing with high temperature flue gas (<250°C), the main choice is graphitised glass fibre cloth; in some special cases, the choice of carbon fibre filter media, etc. It is important to control the speed of the flue gas through the filter media (called filtration speed) in the operation of the bag filter. Generally the filtration speed is 0.5-2m/min, for particles larger than 0.1μm the efficiency can be more than 99%, the equipment resistance loss is about 980-I470Pa. Dust collector bags are made of textile filter cloth and non-textile felt, using the filtering effect of fibre fabric to filter dust-containing gases. According to the temperature material A, room temperature cloth bag: room temperature cloth bag is mainly made of polyester, polypropylene, acrylic and other fibers by non-woven, textile process, with good air permeability, smooth surface, good dimensional stability, easy to strip dust and other excellent performance. Mainly used in general industrial enterprises with dust pollution industry dust removal and room temperature flue gas treatment and other fields. Second, medium-temperature bags: as the country attaches greater importance to environmental protection, especially in recent years, the rapid development of bag-type dust removal technology industry, China began to use imported synthetic fibers developed can adapt to the more severe working conditions, ultra-long service life of high-performance filter materials. At present the more common medium-temperature filter materials are aramid fibers, PPS series fibers through the dip-tie, waterproof, oil-proof, anti-corrosion process treatment, so as to achieve the desired effect;. Third, high-temperature bags: high-temperature bags are mainly made of P84, expanded glass fiber, ultra-fine glass fiber and other high-temperature resistant fibers through the textile, non-woven process, with good thermal stability, high filtration efficiency, long service life and other characteristics. It is mainly used for dust removal under various high temperature flue gas conditions. Detailed description The dust bag/filter bag is the heart of the bag-type dust collector in operation, usually cylindrical pulse-type filter bags are hung vertically in the dust collector, the dust-containing gas enters the dust collector from the air inlet and passes through the flow guide of the dust hopper, so that some of the large particles of dust in the gas are separated by inertia force and fall directly into the dust hopper. Most of the dust i...