From December 2nd to 4th, a large-scale heavy polluted weather struck, and 60 cities in Beijing, Tianjin and Hebei and surrounding areas started an early warning response. It is understood that the Beijing-Tianjin-Hebei region has achieved regional high-level and large-scale early warning and emergency response for the first time. According to environmental experts, almost all emissions related to atmospheric pollutants in China are the highest in the world.
Why has the pollution been frequently polluted for many years?
Speaking of air pollution caused by industrial emissions contribution when the first place, especially coal-fired power plants, waste incineration, metallurgy, cement industry, many industries are now walking a fine line, the standard is not strict, not strict review As well as the lack of advanced dust removal technology, the problem of air pollution is still severe after many years of governance in China! Therefore, the standards of ultra-low emission and the technology of co-processing are particularly important!
Experts have said: In the face of air pollution, we can’t just wait for the wind to come.
With the same breath, the fate. We can't move the mountains, we can't change the airflow, but we can improve the dust removal, achieve coordinated disposal, and ultra-low emissions.
The new idea of ​​innovation and development is that China's air pollution control model has changed from single governance to coordinated control. China has made certain achievements in the coordinated control of metallurgical sintering furnaces, waste incinerators, coal-fired boilers, etc., and has formed an increasingly mature technical route. At this stage, in order to meet the new emission standards, a combination of electrostatic precipitator and wet desulfurization, and a synergistic control process combining electrostatic precipitator, circulating fluidized bed desulfurization and bag filter are gradually introduced. At present, co-processing with bag dust removal technology as the core has become the mainstream of development.
1. Sintering machine head smoke coordination technology
Sintering machine head flue gas coordinated treatment island technology: front electric precipitator (original ESP) + circulating fluidized bed reaction tower (CFB) + bag type dust collector (BF).
2. Solid waste incineration flue gas synergistic treatment technology
"Incineration power generation" is the most effective way to achieve waste reduction, harmlessness and resource utilization. At present, dry, semi-dry and dry + semi-dry processes for treating waste incineration flue gas have been formed with bag dust removal as the core. The method combines to process the collaborative control technology route.
3. Coordinated treatment technology for coal-fired boiler flue gas
(1) Ultra-low emission synergistic treatment technology with low-temperature electrostatic precipitator as the core
Synergistic treatment process: pre-denitration (SCR) + cooling (FGC) + low-temperature electric dust removal (LLT-ESP) + wet desulfurization (WFGD) + wet electrostatic precipitator (WESP) + heating (FGR), is coal-fired boiler smoke Luxury configuration with ultra-low emission coordination.
(2) Ultra-low emission synergistic treatment technology with single tower and three zones wet method ultra-clean desulfurization as the core
Synergistic treatment process: pre-deNOx (SCR) + electric dedusting (ESP) + ultra-clean wet desulfurization (SJ-WFGD), is a practical configuration for coal-fired boiler flue gas ultra-low emission synergistic treatment.
(3) Ultra-low emission synergistic treatment technology with super-clean electric bag composite dust removal as the core
Collaborative management combination: pre-denitrification (SCR) + cooling (FGC) + ultra-clean electric bag composite dust removal (ESP + BF) + ultra-clean wet desulfurization (WFGD) + heating (FGR), is the ultra-low emission of coal-fired boiler flue gas Innovative configuration of collaborative governance.
(4) Ultra-low emission and dry-dry method for coordinated treatment of circulating fluidized bed desulfurization and bag dust removal
Synergistic treatment process: low nitrogen combustion (LNB), furnace denitration (SNCR) + electric dust removal (ESP) + circulating fluidized bed desulfurization (CFB) + bag dust removal (BF), is a low smoke of small and medium coal-fired boilers A fully dry configuration of emissions synergies.
4. Collaborative treatment technology based on kiln tail bag dust removal technology in cement industry
(1) The core technology is a combined collaborative treatment process of “low nitrogen combustion + flue gas denitrification + waste heat boiler + bag filterâ€, which uses high-efficiency bag filter to collect fine particles and adsorb toxic and harmful substances (such as mercury ). High temperature treatment in the kiln to achieve maximum utilization of thermal energy and coordinated management of various pollutants.
(2) The combination is an all-dry process, energy-saving and water-saving, material recycling, using the high-calcium fly ash of the cement kiln as the adsorbent, and the dust layer on the surface of the filter bag participates in synergistic adsorption, and the particulate matter returning system is received.
Compared with the single treatment of pollutants, the multi-component coordination is a brand-new big problem. In recent years, China has carried out research and development on multi-pollutant coordinated control in many fields such as sintering furnace, cement kiln, garbage incinerator and coal-fired boiler, and has achieved certain results, and gradually formed a coordinated control technology route of various genres.
Regarding the co-processing and ultra-low emission with bag dust removal as the core, Xiao Bian has the following questions, and experts are expected to answer questions:
1. Can a tower be both desulfurized and denitrified, such as a baghouse as a reaction tower?
2. Is the bag type dust collector placed before the desulfurization process and after desulfurization, which method is more economical, environmentally friendly and efficient?
3. Some people have proposed to reduce bag-type dust removal resistance to achieve energy-saving, then how to achieve trade-off balance under the energy-saving and ultra-low emission standards?
4. Nanotechnology is developing rapidly. Can filter cloth made of nanofibers meet the requirements of ultra-low emission more effectively?
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