In recent years, prevention and control of air pollution aroused the attention of all walks of life, this article will introduce sintering plant exhaust gas treatment technology analysis. Waste gas from the ironworks mainly comes from the following technological processes: dust will be produced during the transportation, screening and transportation of blast furnace raw materials, fuel and auxiliary raw materials; some harmful waste gases will be generated when the blast furnace is tapped, which mainly includes dust, Carbon monoxide, sulfur dioxide and hydrogen sulfide and other pollutants; blast furnace gas emissions and cast iron iron casting dust emissions and graphite carbon emissions.
As people's awareness of environmental protection, environmental standards are more stringent. In order to reduce investment and cost and improve desulfurization efficiency, in recent years, various countries have invested a great deal of manpower and material resources to develop an economical and efficient new practical desulfurization process. The representative new desulfurization technologies mainly include the following:
(1) deep flue gas desulfurization method
This method is a patented technology developed by Chiyoda Chemical Construction Company in Japan. At the heart is a jet-flow boiling reactor, where the flue gas flows through the slurry in a boiling state and reacts, omitting recirculation pumps, atomizing nozzles, oxidation tanks and concentrators, which invest 50-75% less than limestone-gypsum systems.
(2) Pulsed corona plasma method
This method is by pulse high-voltage power supply in the ordinary reactor to form a plasma, generating high-energy electrons. It can save expensive electron beam accelerator, at the same time has the advantages of simple process equipment, easy operation. Has now completed 14000m3 / h test device, energy consumption 12 ~ 15kWh / m3.
1, raw materials preparation system dust
Sintering raw materials preparation process, raw materials in the collection, mixing, crushing, screening, transportation and ingredients of the various process equipment points have a lot of dust.
Raw material preparation system dust, wet and dry dust removal process can be used. As for the raw material yard, due to the open-pit operation of the stacker and reclaimer, the dust can not be sealed tightly, and the mechanical dust-removing device can not be adopted. The wet-type hydraulic dusting can be adopted, that is, spraying water mist to catch some dust and suppress the moisture Dust flying; on the material crushing, screening and tape and transfer points, set up a closed and exhaust dust removal system. Dust removal system can be distributed or centralized. Depletion dust removal system equipment can be used impulse precipitator, bubble dust collector and pulse bag filter. Cyclone and cyclone water film filter efficiency is low, should not be used; centralized system can be centralized control of dozens or even hundreds of suction points, and install large-scale high-efficiency dust removal equipment, such as electrostatic precipitators, dust removal efficiency.
2, mixing system dust
In the mixture of transport, add water and mixing process, resulting in dust and water gas emissions. Heat back to the mine process produces a lot of dust - water symbiosis gas, the exhaust gas temperature, humidity, dust concentration is high, the focus of governance. Cold and recuperation process due to low temperature, does not produce large amounts of water vapor, dust generated only in the material transfer point emissions.
The key to solving the exhaust gas treatment of the mixture system is to use the cold-return process as much as possible. Mixing system should be used for dust removal dust, dust removal equipment can be used such as dust-intensive precipitator dust removal equipment.
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