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Information Name: | The new low-temperature flue gas denitrification SCR equipment |
Published: | 2014-12-29 |
Validity: | 30 |
Specifications: | dz |
Quantity: | 10.00 |
Price Description: | |
Detailed Product Description: | The new low-temperature flue gas denitrification technology is based on the traditional SCR technology on the research and development of a proprietary technology denitration. Currently the most widely used and most effective flue gas denitrification technology is NH3 selective catalytic reduction NOx technology (SCR). As the core of the SCR process - has become a key catalyst to achieve the nitrogen oxide emission reduction targets, the commercial catalyst system for the current widespread use of titanium-based vanadium catalyst (V2O5-WO3 / TiO2), the activity of the higher temperature window (320 to 420 ℃), the SCR device will need to be installed before and after the air preheater economizer, the use of flue gas temperature to reach the self-temperature region, and where a high concentration of dust and the presence of SO2, catalyst poisoning and is easy to reduce the use of lifetime. SCR technology promotion restrictions main bottleneck that the reaction temperature requirements are relatively high, making the denitration process energy is large, the larger the corresponding project investment costs. To overcome these shortcomings, Xiangyang first world with the National Environmental Protection Equipment Co., Ltd. Technical Research Centre of flue gas desulfurization project jointly developed a low-temperature flue gas denitrification technology, after a long period of repeated small-scale and pilot studies, and through a glass enterprises in Zhejiang furnace flue systems and a coking plant in Inner Mongolia coking flue gas test, improved technology, and made a lot of industrial data, tests showed that the technology can be very good to complete flue gas denitrification at low temperatures task, already have industrial application of technology infrastructure and conditions. Currently our company is actively seeking opportunities to implement industrial applications. Second, the new low-temperature flue gas denitrification technical principles of new low-temperature DeNOx technology is based on the traditional SCR technology to optimize get, its the same technical principles, mainly in the role of a catalyst to NH3 as a reducing agent, selective and smoke NOx gas in the reaction and generate toxic pollution of N2 and H2O. The reducing agent may also be a hydrocarbon (such as methane, propane, etc.), ammonia, urea and the like. With NH3 as a reducing agent for example, the reaction is as follows: 4NH3 + 4NO + O2 → 4N2 + 6H2O (1-1) 4NH3 + 2NO2 + O2 → 3N2 + 6H2O (1-2) 8NH3 + 6NO2 → 7N2 + 12H2O (1- 3) The new low-temperature flue gas denitrification technology breakthrough is superior low-temperature catalytic, unlike the conventional catalyst vanadium catalyst up to 400 ℃ ignition temperature, the new catalytic method used at 120 ℃ to have good activity, the applicable temperature window for 90 ~ 200 ℃. Table 1 flue gas denitration front window influencing factors need to meet a number Item temperature 120-180 ℃ low temperature catalytic effect can not be achieved, the high humidity affect the adsorption of 2 <5% water vapor content too easily poisoned catalyst oxygen 3- 3 10% concentration is too low affects the efficiency of four denitration dust concentration <50mg / Nm3 will clog the bed is too high, increase the resistance of the system and affect the desulfurization efficiency and product quality acid 5 SO2 concentration <100mg / Nm3 too high, the reaction with a reducing agent, reacts blockage of the bed, while the new low-temperature DeNOx catalyst poisoning technology process flow diagram shown in Figure 1, the first to be treated by the fan into the flue gas treatment system to remove dust, quenching, the temperature, flue gas dust concentration, moisture, oxygen and other indicators to meet the SO2 concentration denitration process requirements (Table 1), and then enters the denitration tower, and NH3 as a reducing agent storage tank directly from the top of ammonia injected into and mixed with the flue gas. Denitration tower filled with a catalyst in whole or in bulk, gas distribution pipe into the flue gas denitration zone, through the catalyst layer, the flue gas NO, O2, NH3 sufficient basis under catalysis catalyst, NO is reduced to N2 and H2O, direct discharge standards by smoke after bed. Denitration catalyst life is generally 3-5 years, after deactivation of the catalyst, need to be replaced, and the deactivated catalyst can be regenerated and returned for the second activation, recycling. The system consists of fume collection part, preprocessing, denitrification part ammonia source components. Fume collection part of the main flue pipes, valves, fans, chimney composition; preprocessing mainly by dust, quenching towers and other components, some of the major equipment for denitration denitration tower (including catalyst); some of the major source of ammonia is ammonia storage tank, evaporation equipment and cushioning devices. Third, the technical characteristics of high temperature catalytic oxidation of variable low-temperature catalytic oxidation and adsorption catalyst catalytic function of the effective combination of activated carbon, low-temperature catalytic cracked the technical difficulties. (1) DeNOx efficiency up to 80%, engineering practice to achieve a 85% denitrification efficiency; (2) adaptability, can be well adapted flue gas volume fluctuations, and the flue gas temperature at 90-200 ℃ The large-scale fluctuations; (3) economic efficiency, the use of activated carbon as catalyst support, compared to titanium-based catalyst, reducing the cost from the source to the catalyst preparation process is simple and efficient principle, preparation means relatively simplified, making the catalyst long-term continuity of supply, while the reaction temperature is lowered again greatly reduced operating costs. (4) no secondary pollutants, consistent with national laws and regulations with regard to green production. (5) with the use of flue gas desulfurization technology to solve the traditional catalysts require high reaction temperature, low sulfur poisoning antioxidant capacity, poor stability, in line with the current development trend of environmental protection industry. Fourth, a pilot engineering applications, stationary device denitration pilot study validated through a series of experiments, the new low-temperature SCR DeNOx technology has been successful in a small pilot plant, get a lot of data and conclusions. On this basis, the use of independent research and to build a fixed low temperature DeNOx pilot plant, low temperature SCR DeNOx process was verified. The main parameters of the experiment shown in the following table: Table 2 low temperature SCR DeNOx pilot experimental parameters flue gas flow (m3 / h) catalyst loading volume (m3) airspeed (h-1) NO content (mg / Nm3) O2 content (%) temperature range (℃) 40 0.004 10000 1000 5 ~ 6 90 ~ 180 Experimental results show that at 120 ℃, the pilot denitration efficiency of about 73%, 150 ℃, the denitration efficiency increased to more than 80%, exports NO concentration of about 200mg / Nm3, has reached the national emission standards. When the reaction temperature is raised to 180 ℃, the denitration efficiency of over 87%, export concentration of about 130mg / Nm3, lower than most of the national emission standards for air emissions industry. 2, the mobile device combined with desulfurization and denitrification in the glass furnace flue gas cryogenic test 2.1 SCR DeNOx pilot car use mobile desulfurization and denitrification equipment at a glass furnace flue gas conditions Glass Group, a joint pilot test desulfurization and denitrification . Furnace flue gas is characterized by: high SO2 and NO concentration, the fluctuation range of large, low flue gas temperature, the higher oxygen content. Joint pilot furnace flue gas desulfurization and denitration tests conducted for continuous operation for more than 200h. Under the conditions of a glass furnace flue gas emissions from the production line Glass Group, conducted a related denitration performance test. The main flue gas conditions in the following table: Table 3 Zhejiang parameters of a glass furnace flue gas flow (m3 / h) airspeed (h-1) NO concentration (mg / Nm3) SO2 concentrations (mg / Nm3) O2 content (%) H2O content (%) Temperature (℃) 80 5000 1500 ~ 2000 1000 ~ 4000 9 ~ 12 6 ~ 10 130 ~ 170 The results show: the desulfurization section to show a good desulfurization performance, most of the time to maintain the 98 desulfurization efficiency% or more, export concentration is below 50mg / Nm3. After entering through the flue gas desulfurization and denitration section, after optimization, denitrification efficiency to maintain a long stable, basically in between 75% to 80%, the average outlet concentration of about 300mg / Nm3, lower than the national glass furnace flue emission standards (700mg / Nm3). Overall denitration performance, and successfully passed the EPA expert technical appraisal. Owners show great interest in matters being discussed engineering applications. 2.1 low coking plant flue gas denitrification SCR pilot in June 2014 to August, a coking plant in Inner Mongolia Wuhai use truck-mounted pilot plant desulfurization and denitration conducted a joint test for coking furnace flue cases were long continuous The denitration test, the test results are as follows: Condition coke concentration of nitrogen oxides in the exhaust gas has a greater volatility of the reactor inlet concentration of NOx in the range of 680 ~ 1030mg / Nm3. Reactor outlet NOx concentration range of 50 ~ 260mg / Nm3, export concentration increased with the inlet concentration increased, the denitration efficiency in the range of 73 to 94%, basically stable at around 83%. Experimental results show that the test used in low-temperature catalyst for high-load operation of the coke oven exhaust. Five. Prospects currently on the denitration market, high-temperature SCR technology to dominate the power industry due to high flue gas temperature, basically take this technology denitration process, but for the steel sinter, coke, glass furnaces and other industries, due to end row flue gas temperature is low, if the traditional SCR technology for flue gas reheating will cause excessive energy consumption, by contrast, the biggest advantage of low-temperature SCR technology is the lower reaction temperature window for these fumes have good adaptability and matching, which can effectively solve these difficult problems industry process selection, manufacturing enterprises solve environmental problems. The new low-temperature SCR DeNOx catalytic technology after years of research and a long test, technology has matured, has all the conditions for industrialization. |
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Copyright © GuangDong ICP No. 10089450, Environmental Protection Equipment Co., Ltd. Xiangyang first world All rights reserved.
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You are the 9245 visitor
Copyright © GuangDong ICP No. 10089450, Environmental Protection Equipment Co., Ltd. Xiangyang first world All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility