Studying PGDS electric filters for removing high-ohmic magnesite dust

Conclusions Double-staged dust-extraction equipment based on NIIOGAZ cyclones of the type TsN-24 and electric filters PGDS-73-3 situated behind a rotary furnace (diameter 3.6 and length 90 m) for firing magnesite facilitated operations without a break in the health-safety norms for dust extraction.The optimum gas velocity in the cyclones in which their efficiency was about 90% is 7 m/sec. In this case there was no wear of the active part of the cyclones.The efficiency of the electric filter largely depends on the dust load on entry. With a reduction in the input dust concentration from 25.3 to 9.5 g/Nm³ the residual dust concentration is respectively reduced from 0.240 to 0.143 g/Nm³ with a water concentration in the raw material fed into the furnace of 1.2%.An increase in the moisture content of the raw materials to 2.5% causes a reduction in the resistivity of the dust from 10¹³ to 7·10¹¹ ·cm, and there is partial suppression of the back corona in the electric filter, as a result of which the residual dust concentration diminishes to 0.062 g/Nm³ which is less by a factor of 2 or more than the health-safety norms.Translated from Ogneupory, No. 7, pp. 18–25, July, 1970.     

Equipment for extracting magnesite dust from drying drums

Conclusions The dry method of purifying flue gases behind drying drums for drying magnesite, using group equipment of cyclones TsN-15 designed by NIIOGAZ, is effective, simple, and convenient.Translated from Ogneupory, No.1, pp.63–64, January, 1967.     

烧结金属除尘技术的研究进展

介绍一种高性能的过滤材料——烧结金属过滤材料及其特性。探讨了该过滤材料在除尘技术中的应用及其发展状况 ,对于烧结金属过滤式除尘的设计优化进行了初步研究 ,最后对该除尘技术的前景做了展望     

Technology for obtaining powder from extracted caustic magnesite dust utilizing sulfates

Conclusions A technology was developed for obtaining refractory powder from extracted caustic magnesite dust. The method includes solution in water of the sulfates, hydration of magnesia, thickening and filtration of the slurry, mixing the cake with dry magnesite dust, briqueting the mixture, and firing the briquet.The technology eliminates contamination by sulfates of the surroundings and clogging of the surfaces of the pipes in waste heat boilers, and yields from the caustic dust a dense powder for making refractory magnesite products, and enables us to utilize sulfates.Translated from Ogneupory, No. 4, pp. 11–16, April, 1981.     

燃烧后烟气的脱硫除尘技术

为了满足环境保护的要求,燃烧后烟气要实现达标排放,必须对其中的二氧化硫及灰份进行治理。本文重点介绍了燃烧后烟气脱硫除尘技术中石灰法脱硫除尘的原理、工艺流程、装备及实际应用效果。石灰法脱硫具有投资少、脱硫效率高、运行成本低等优点。     

聚氯乙烯干燥系统尾气除尘工艺对比

介绍了湿式洗涤除尘工艺和袋滤器除尘工艺的核心设备和具体流程,比较了两种工艺应用在聚氯乙烯干燥尾气除尘方面的优缺点.     

Performance of a catalytically activated ceramic hot gas filter for catalytic tar removal from biomass gasification gas

Silicon carbide-based filter elements were catalytically activated to provide filter elements for catalytic tar removal from biomass-derived syngas. The filter element support was coated with CeO₂, CaO–Al₂O₃ and MgO with a specific surface of 7.4, 15.9 and 21.9 m²/g synthesized by exo-templating with activated carbon. Doping of a MgO coated filter element with 60 wt% NiO has led to an increase of the specific surface from 0.15 to 0.21 m²/g, whereas in case of a MgO–Al₂O₃ coated filter element a decrease from 1.18 to 0.91 m²/g was found. An increase of the NiO loading from 6 to 60 wt% on a MgO coated filter element resulted in an increase of the naphthalene conversion from 91 to 100% at 800 °C and a face velocity of 2.5 cm/s at a naphthalene concentration of 5 g/Nm³ in model biomass gasification gas. In case of a MgO–Al₂O₃ coated filter element with 60 wt% NiO in addition to complete naphthalene conversion in the absence of H₂S, a higher conversion of 66% was found in the presence of 100 ppmv H₂S compared to 49% of the MgO–NiO coated filter element. After scaling up of the catalytic activation procedure to a 1520 mm long filter candle, which shows an acceptable differential pressure of 54.9 mbar, 58 and 97% naphthalene conversion was achieved in the presence and absence of H₂S, respectively. The calculated WHSV value of 209.6 Nm³ h⁻¹ kg⁻¹ indicates the technical feasibility of a further increase of the catalytic performance by an increase of the NiO loading.     

超低阻力除尘滤袋在水泥厂收尘系统中的应用

以浙江虎鹰水泥有限公司收尘系统为例,介绍了该公司收尘器由于运行时间长,存在系统漏风严重、粉尘排放指标超标、运行压差大、收尘系统电耗高等问题。通过采取对收尘系统进行结构优化改造,使用超低阻力、超低排放除尘滤袋等一系列措施,实现了粉尘超低排放,同时,降低了系统运行压差及系统运行电耗,有效降低了运营成本。     

超低阻力除尘滤袋在水泥厂收尘系统中的应用

以浙江虎鹰水泥有限公司收尘系统为例,介绍了该公司收尘器由于运行时间长,存在系统漏风严重、粉尘排放指标超标、运行压差大、收尘系统电耗高等问题。通过采取对收尘系统进行结构优化改造,使用超低阻力、超低排放除尘滤袋等一系列措施,实现了粉尘超低排放,同时,降低了系统运行压差及系统运行电耗,有效降低了运营成本。     

锅炉烟气脱硫除尘与渣浆水的综合利用

介绍了锅炉烟气脱硫、除尘工艺的主要特点以及废渣浆水的综合利用，治理后的效果以及存在的主要问题。     

Making wall blocks for electric steel-smelting furnaces from magnesite chrome brick waste

Conclusions The wear resistance of wall blocks tamped from magnesite-chrome brick waste after service is not inferior to those made of magnesite powder.Ground chrome-magneslte and magnesite-chrome waste after service may also be used to make different furnace parts (channels, pseudo baffles, loading window covers, and so on).The use of the waste will make it possible to reduce the consumption of metallurgical magnesite powder.     

Elements of gas cleaning and dust removal systems lined with refractory concretes

Principles are considered for the construction of concrete linings for furnaces, gas ducts, cyclones and other elements of gas cleaning and dust removal systems subject to the action of high temperature, chemically corrosive gases, and abrasive wear. Examples are provided of manufacturing lined elements of gas cleaning systems made of refractory concretes in various branches of industry. __________ Translated from Novye Ogneupory, No. 11, pp. 15–19, November 2007.