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When designing cement plant pollution problems that need attention

When designing cement plant pollution problems that need attention

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1. Dust.

Cement dust has long been considered the main source of pollution in the broken material, generated in the process of stacking, grinding, storage, drying, conveying, firing , and bulk packaging factory, etc.

Entire cement production line generally has 30 to 40 organized dust emission points, including the largest gas emissions from cement kiln dust point. Cement kiln dust control measures currently mainly collecting bags and ESP. There may have yard for fugitive emissions and dust generated by the use of open-air transport and other control measures can be stamped humidifiers fugitive emissions to almost zero. The remaining smaller production point almost use the dust bag filter.

Currently commonly used cement plant dust collection bags and ESP technology is relatively mature, the bag filter dust values ​​generally below 50mg/m3, the actual plant can reach below 30mg/m3, the electrostatic precipitator dust is usually 100mg / m 3 or less 50mg/m3 , so now the new plant can meet the national environmental protection department of the cement plant dust emissions requirements.

2. Acidic oxides SOx and NOx.

Cement clinker burning need to burn fuels such as coal or heavy oil, fuel due to the presence of sulfur and nitrogen in the air is also a lot of nitrogen, will produce SOx (SO2 and SO3) combustion and NOx ( mainly of nitric oxide NO and nitrogen dioxide NO2).

SOx control measures mainly uses low-sulfur raw materials and fuels.

NOx control measures mainly reasonable to reduce α, but you should pay attention, not let the mechanical and chemical kiln and calciner increased loss of incomplete combustion, as well as the toxic smoke increases. Thus , α should be reasonable to reduce the discharge of hazardous substances at least in principle. Denitrification apparatus can be installed or low calcination.

3.CO2.

Cement plant mainly refers to the discharge of greenhouse gases CO2, cement production, direct CO2 gas main sources are pulverized coal combustion and raw meal CaCO3 decomposition. Pure low temperature waste heat power generation technology to control the production and development of portland cement calcium cement, clinker instead of increasing the use of mixed materials, are a good way to reduce CO2 emissions.

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4. Noise.

Cement noise mainly from the mill, air compressor, blower , high pressure centrifugal fans , crushers, pumps and other equipment. These devices near the noise level of 90 decibels or more generally.

The maximum noise, a large cement plant ball mill grinding noise at about 120 db , generally with plant noise and sound-absorbing material to absorb the mill using noise. Direction of grinding technology is the use of vertical mill instead of ball mill grinding, grinding is not only more efficient than milling, but also solved the noise problem. Using open layout, noise problems can meet environmental requirements. Using pre- roller press grinding technology can achieve the same effect. Compressor noise is also a great tradition, using screw compressor technology can better reduce noise and meet environmental requirements.

High pressure blower noise is very large , Zenith is currently being developed and adopted Lobe Roots Blower , Blower than two clover leaf blower noise can be reduced by about 10 db , while saving 10% to 20 %.

High pressure centrifugal fan noise at 100 decibels, the number of large cement plant fan, fan noise is relatively prominent. Reduce system resistance, dual fan series , import and export add silencers, plus enclosures, consider using double telescopic chimney noise and system design , etc., can effectively reduce the noise.

Limestone and other hard material crushing noise is also very large, over 100 dB, is also only by closing plants and reducing the running time to alleviate noise problems. Developed countries have a large number of uses twisted Roll Crusher replace hammer crusher, PEW jaw broken is designed by Zenith company by use of advanced technology, R & D by the our Germans team , can be well used in cement .

5. Wastewater discharge.

Cement kiln is mainly conditioning tower water, water vapor emissions, a small amount of cooling water discharge basically meet emission requirements. In addition, rotary kiln , dryers and other supporting wheel dip tank wastewater, can be discharged after degreasing . Water containing traces of acid, base must be discharged in the laboratory and process (pH = 6 ~ 8) before discharge .

6. Magnesia-chrome brick.

Chromium pollution control requirements for chromium refractories, cement plants have not done much so far. On the one hand , the standard has not restrict refractory chromium content , on the other hand, replacing down the cement plant waste magnesia-chrome refractory no specialized anti-pollution accumulation facility, when rain washed could seriously pollute groundwater. Europe after the 1990s has banned the production of chromium-containing refractories. Magnesium chromium waste pile material have a special envelope yard, and sheds rain, while harmless treatment.

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