Dust removal preparation system
Ore and coal (including coke) are the basic raw materials and fuels of metallurgy and building materials industry; To produce high-quality cement, steel and non-ferrous metals, raw materials and fuels must be treated in advance. In the processing process of raw materials and fuels, crushing, grinding, screening, grading, dosing, mixing, homogenization, granulation, drying, cooling, storage, transportation and packaging are dust points; In the ore calcination, roasting, drying and other processes will also produce a large amount of dust containing waste gas, serious pollution of the environment, therefore, where the process related to dust must have dustproof design.
The solid particle emission concentration of bag dust removal technology is lower than that of other dust removal technologies, generally stable below 30mg/Nm3, and the dust removal particle size is 1-200μm. If the dust concentration of the bag dust collector used to purify the flue gas of the coal-fired boiler is less than 20mg/Nm3, the dust concentration of the blast furnace gas and water gas is less than 5mg/Nm3; It is also lower than 5mg/Nm3 for waste incineration power plants. All these highlight the position of bag dust collector in energy saving and emission reduction.
Outstanding advantage
Ore and coal (including coke) are the basic raw materials and fuels of metallurgy and building materials industry; To produce high-quality cement, steel and non-ferrous metals, raw materials and fuels must be treated in advance. In the processing process of raw materials and fuels, crushing, grinding, screening, grading, dosing, mixing, homogenization, granulation, drying, cooling, storage, transportation and packaging are dust points; In the ore calcination, roasting, drying and other processes will also produce a large amount of dust containing waste gas, serious pollution of the environment, therefore, where the process related to dust must have dustproof design.
The solid particle emission concentration of bag dust removal technology is lower than that of other dust removal technologies, generally stable below 30mg/Nm3, and the dust removal particle size is 1-200μm. If the dust concentration of the bag dust collector used to purify the flue gas of the coal-fired boiler is less than 20mg/Nm3, the dust concentration of the blast furnace gas and water gas is less than 5mg/Nm3; It is also lower than 5mg/Nm3 for waste incineration power plants. All these highlight the position of bag dust collector in energy saving and emission reduction.
As early as the 1980s, our company independently developed the vertical preheater for calcination of limestone and produced a pulse bag dust collector, whose dust concentration was lower than 50mg/Nm3 and reached the standard. Recently, with the national improvement of emission standards and the expansion of the application of bag dust collector, for small and medium-sized crusher, screening, feeding and powder warehouse top dust removal and dust collection characteristics, our company has developed a compact structure and high dust removal efficiency of the single dust removal unit (ZHMC); For roasting, calcining, drying ore and chemical or physical reaction, release a lot of gas high temperature industrial kiln, our company developed a high temperature fan, high temperature dust collector and pipe and dust collection system of the air box dust collector system (ZLPM), Through the induced draft fan set at the tail of the kiln, the 130℃-280℃ high temperature dust containing gas is extracted and dust removal is carried out. For mining stope and wind in the fine powder (less than 50μm) content, dust collector and the characteristics of multi-section mining powder processing, and cement, coal powder preparation and other powder engineering, our company developed including bag dust collector, fan and ventilation pipe long bag pulse dust collector (ZLCM), the machine processing air volume, with the characteristics of centralized dust collection system. ZHMC, ZLPM and ZLCM can further develop and formulate corresponding process solutions according to customer requirements.
Major advantage
As early as the 1980s, our company independently developed the vertical preheater for calcination of limestone and produced the pulse bag dust collector, whose dust concentration was lower than 30mg/Nm3 and reached the standard. Recently, with the national improvement of emission standards and the expansion of the application of bag dust collector, for small and medium-sized crusher, screening, feeding and powder warehouse top dust removal and dust collection characteristics, our company has developed a compact structure and high dust removal efficiency of the single dust removal unit (ZHMC); For roasting, calcining, drying ore and chemical or physical reaction, release a lot of gas high temperature industrial kiln, our company developed a high temperature fan, high temperature dust collector and pipe and dust collection system of the air box dust collector system (ZLPM), Through the induced draft fan set at the tail of the kiln, the 130℃-280℃ high temperature dust containing gas is extracted and dust removal is carried out. For mining stope and wind in the fine powder (less than 30μm) content, dust collector and multi-section characteristics of mineral powder processing, and cement, pulverized coal preparation and other powder engineering, our company developed including bag dust collector, fan and ventilation pipe long bag pulse dust collector (ZLCM), the machine handles large air volume, with the characteristics of centralized dust collection system. ZHMC, ZLPM and ZLCM can further develop and formulate corresponding process solutions according to customer requirements.
Process flow
Dust removal process of kiln tail in lime industry
The flue gas temperature at the end of the lime kiln is 220℃, and the dust concentration is generally 10~30g/Nm3. According to the characteristics of lime production and dust, and drawing years of experience, our company adopts large-scale high temperature off-line pulse dust collector for kiln tail dust removal and sets a two-stage dust removal system. * level dust removal set cyclone dust collector, secondary high temperature bag dust collector, high temperature induced draft fan. The whole system is operated under negative pressure and is well sealed to prevent dust from spilling. The purified gas is discharged to the atmosphere by a high temperature resistant fan through the chimney. The dust concentration of the purified gas is controlled within 30mg/Nm3, which is better than the national standard. When the rotary kiln starts drying, the smoke volume is small, the temperature is low, and the moisture content is large. In order to prevent the flue gas from condensation through the bag dust collector, the inlet pipe valve of the bag dust collector is closed, and the flue gas enters the cyclone dust collector through the bypass pipe and is discharged to the atmosphere through the chimney.
The dust collected by the bag dust collector is sent into the dust bin through the rotary discharge valve, scraper and bucket elevator, and is regularly transported away by special vehicles. In order to make the dust hopper discharge smoothly and prevent the side wall from sticking, the bin wall vibrator is set on the inclined wall of the dust hopper. The dust collector adopts high temperature resistant filter material. The inlet of the fan is equipped with an electric regulating valve to ensure the flue gas pressure of the kiln. At the same time, the fan is equipped with a hydraulic coupler to adjust speed to meet the different production conditions of the kiln.
Crushing dust removal process
Dust removal from storage bin
According to the different feeding methods of finished products and storage bin layout, it can be divided into four ways: tape head discharge, chute discharge, discharge machine and screw discharge.
Dust collection technology of pulverized coal preparation
In the pulverized coal preparation section, the dust collector is used to collect pulverized coal for 200 purpose. In view of the combustibility of pulverized coal, explosion-proof doors are set in each room of pulverized coal dust collector, which has high safety.
The preparation process of pulverized coal is as follows:
Raw coal and coke powder with particle size less than 25mm are fed into the silo by the lifting machine respectively. Raw coal and coke powder are fed evenly from the lower part of the silo by the feeder and enter the mixing silo through the belt conveyor and the lifting machine. Materials in the mixing silo are uniformly fed into the feeding device of the coal mill by the metering feeder and enter the inner silo of the coal mill. The drying of the coal mill system uses the hot air drawn from the kiln head furnace of the rotary kiln to dry inside the mill; The pulverized coal enters the dynamic separator for classification under the negative pressure of the induced draft fan of the dust collector. The unqualified coarse particle coal is returned to the feeding device of the coal mill by the return screw conveyor for secondary grinding and drying. The qualified fineness coal enters the pulse bag dust collector. Bag type dust collector collects qualified coal powder, and the collected coal powder enters the coal powder bin through the screw conveyor; After measuring by powder flowmeter, the pulverized coal is sent to the burner of the kiln head by the pneumatic conveying device.
