Environmental Protection Equipment for Solid Fuel Boiler
I. Boiler Solid Fuel Analysis:
1) Coal Ash Composition Introduction:
Coal ash composition is complex, mainly composed of silicon, aluminum, iron, titanium, calcium, magnesium, sulfur, potassium, sodium and other elements of oxides and salts. When the coal burns, most of sulfur is oxidized to sulfur dioxide (SO2), with the flue gas emissions forming atmospheric pollution, harming animal, plant growth and human health, a corrosive action on metal equipment; When more coal used in metallurgical coking sulfur, also affect the quality of the coke and steel. When the coal that the sulfur content is high used for metallurgical coking, it also affect the quality of coke and iron and steel.
2) Biomass Solid Formed Fuel Introduction：
Biomass solid formed fuel (hereinafter referred to as biomass fuel, commonly known as straw coal) is a modern clean fuels that according to the new technology and special equipment, crop stalks, wood shavings, sawdust, peanut shell, corn cob, straw, rice husk, straw husks, tree branches and leaves hay will be compressed carbide forming, without any additives and binder. It is 6cm ~ 8cm in diameter, and length of 4 ~ 5times its diameter, broken rate is less than 2.0%, dry basis moisture content less than 15%, the ash content less than 1.5%, sulfur and chlorine content is typically less than 0. 07%, the nitrogen content is less than 0. 5%.
II. Boiler Supporting Scheme: Multi-Tube Dust Catcher + Wet Dust Collector
1) The multi-tube dust catcher is mainly composed of a number of cyclones combination in a sealed box, including the housing of placement cyclone dust collector, the entrance and outlet of flue gas and dust collecting hopper. Working principle: filter movement by the guider, cyclone, the exhaust pipe, etc. , made of ceramic or cast iron materials. When the dust containing gas enters the the dust collector entrance, through the guider and whirlwind internal rotation, the dust and the gas are separated under the centrifugal force action, so the dust lands in dust collection box is discharged through the air lock. The efficiency can reach 93%.
The wet dust remover is known as "the mist eliminator". It is the device that it make the dust gas and liquid (usually water) in close contact, exploiting inertia collision of water droplets and particles or the full mixing of water and dust and other functions to trap particles or to increase or stay in a fixed container to achieve the effect of water and dust separation.
The filter of dust particle size less than 5 microns dust removal efficiency is high, service life for up to 5 ~ 8 years. Filter structure is compact, small footprint, water consumption is small, with 5 ~ 7 cubic meters per second dust covers an area of about 4 square meters of airflow, USES about 1 ton/hour.
The dust removal efficiency of the dust remover is high for a particle size less than 5 μm dust, the service life is up to 5 to 8 years. Dust collector has the advantages of compact structure, small space occupation, small water consumption, the water consumption is about 1 tons / hour
Taking multi-cyclone matching, glass steel desulfurization dust removal device, air pollutant emissions can be few, low concentration. Solid fuel combustion can be achieved after microinjection emissions of NOx, SO2 emissions below 33. 6 mg/m3, soot emissions less than 46 mg/m3. Refer to the standard, the gas boiler emissions standards is: SO2≤100mg/m3, dust≤200mg/m3.
III、Conclusion
Solid fuel boilers will be becoming a popular trend in South Asia, Southeast Asia, Africa and other underdeveloped countries. The use of a large number of solid fuel boiler will lead to serious environmental pollution, which must be strictly equipped with the corresponding dust removal equipment to ensure the environment protection. It is responsible for boiler supplier to protect our home together.
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