The flat glass industry is difficult to meet the emission standard
since January 1, 2014, the existing flat glass production enterprises have implemented the emission standard of air pollutants for flat glass industry (hereinafter referred to as the standard). A few days ago, when I went to Zhengzhou, Henan, Langfang, Hebei and Yulin, Shaanxi with the Ministry of environmental protection to supervise the prevention and control of air pollution, I found that many flat glass enterprises still have excessive emissions. Some flat glass enterprises reported that due to immature treatment technology, they could not meet the standard emission requirements
at present, why are some enterprises unable to meet the emission standards? Is there any suspicion or doubt that the standard is "too high"? Whether the mainstream technology widely used in China can meet the requirements of the standard? Therefore, we interviewed relevant enterprises and experts
the combination of flat glass denitration and dust removal technology pays attention to
the denitration device is arranged after the high-temperature dust collector, and denitration needs to be carried out after cooling
it is introduced that the core technology of dust emission reduction and NOx removal in flat glass enterprises is high-temperature electrostatic precipitation and selective catalytic reduction (SCR) denitration technology. At present, SCR technology is mainly used for flue gas denitration in power plants. Due to the particularity of glass furnace flue gas, the flat glass industry has special needs for SCR denitration technology
experts said that the dust content of glass furnace flue gas is large, ranging from 200 mg/m3 to 280 mg/m3, and the dust particle size is small. The dust contains alkali metals and alkaline earth metals that can lead to catalyst poisoning, which is easy to cause plugging of catalyst pores. At the same time, Na2SO4 needs to be added as clarifier in the glass production process, accounting for about 5% of the total ingredients of flat glass, resulting in the dust in the flue gas containing Na2SO4 particles, which dissolve in water and produce sodium ions, which is easy to cause poisoning of the catalyst. Therefore, it is considered that the denitration device is arranged after the high-temperature dust collector, and then denitration is carried out after removing most of the dust
at present, the exhaust gas temperature of domestic glass furnaces is 420 ℃ ~ 450 ℃, while the appropriate temperature of SCR denitration catalyst is 300 ℃ ~ 380 ℃. The flue gas temperature exceeds the efficient working temperature of conventional catalyst, and denitration needs to be carried out after cooling
as Chen Xuegong, deputy general manager of Jiangsu branch bank group, said, the most fundamental core technology of SCR is catalyst selection and reactor design. He said that in order to compete for orders, some domestic environmental protection enterprises competed viciously. After winning the order, they did little work in flow field simulation design and cold model test, resulting in unscientific reactor design, resulting in local ash deposition and irregular wear of catalyst during equipment use, which had a fatal impact on the whole denitration system
it is understood that if each project strictly implements the detection and calibration of the production line, the personalized design, flow field simulation design and cold model test of the project, the project can be successfully put into operation at one time
it is understood that since 2006, the science and Technology Bank Group has jointly built a denitration technology laboratory in the glass industry with Tsinghua University, and has set up a special team to study the key common technologies of NOx removal in industrial kilns such as cement and glass, and has made a breakthrough. Kehang group has successively undertaken the first flat glass high temperature dust removal +scr denitration EPC project and a large number of denitration model demonstration projects
in the glass industry, Kehang group has successively undertaken a number of high-temperature dust removal +scr denitration EPC projects such as CSG group, Zibo Jinjing, Qingdao Jinjing and Shahe Jingtai. The 600t/D and 900 t/D high temperature dust removal + SCR denitration EPC projects of CSG group have been monitored by authoritative environmental protection monitoring institutions, and the emission concentration is far lower than the national emission standard of air pollutants
there are difficulties in the management of production lines using petroleum coke and heavy oil.
according to the requirements of industrial policies, flat glass production enterprises should adopt clean energy and high calorific value fuels, which is not the general situation of enterprises in the industry.
Chen Xuegong said: "some flat glass enterprises say that the processing technology is immature and cannot meet the standard requirements is incorrect."
Chen Xuegong said that for production lines that use natural gas and coal to gas as fuels, the treatment technology of PM and NOx emissions is very mature. However, the PM and NOx emission reduction technologies of enterprises that use petroleum coke and heavy oil as fuels need to be further matured
it is understood that the science and Technology Bank Group has specially set up a research group on the environmental governance of flat glass with petroleum coke and heavy oil as the main fuels, and quickly tackle key problems through increasing research and development efforts, international cooperation, laboratory trials, etc. Next, we will look for suitable enterprises to carry out industrialization experiments and the construction of model projects. Level 3: press the "gear" key on the front panel
according to the requirements of industrial policies, flat glass production enterprises should adopt clean energy and high calorific value fuels, which is related to what emission reduction technology enterprises adopt and whether they can meet the emission standards
Chen Xuegong introduced that there are mainly four kinds of fuels widely used in flat glass enterprises at present, and the order from good to bad is natural gas, heavy oil, coal to gas and petroleum coke. At present, most of the world uses natural gas as fuel, and some use heavy oil. Most domestic enterprises use coal to gas and petroleum coke, and there are only a few domestic production lines using heavy oil as fuel an insider also introduced that the carbon emission intensity of petroleum coke, coal tar and other fuels is twice that of natural gas fuels China glass () Department
an insider also introduced that the carbon emission intensity of petroleum coke, coal tar and other fuels is twice that of natural gas fuels
China glass () Department
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