Processed materials and techniques default resolution crushing plant

Fan in the fan air volume selection issue, I have contacted many of the technical staff in both there is a misunderstanding (including the institute's technical staff): Always

mention by air delivery system as the standard material amount of wind mill design requirements regardless of the negative pressure, even thought the selected wind

Pressure pulverizer machine can guarantee the requirements of another job pressure. In fact grinder required pressure is the pressure difference inside and outside the mill

sieve, air volume can not be guaranteed, then the pressure inside and outside on the small sieve, coal crushing plant powder can not be immediately qualified discharge, and was repeated

hammer mill combat and processing

Large circulation layer, resulting in increased power consumption grinder, impact crushing yield, so the fan flow must ensure pressure and wind mill sieve references to material

delivery system requires air flow into account, choose whichever is greater. Pressure measured at system pressure loss decision. Opportunities with centrifugal wind

The system increases wind resistance loss decline, such as increased yield when crushed, fan air flow is reduced, the fan should be considered when selecting a fan operating

point when the actual use of the parameters and the impact of the impeller wear.

Vacuum box grinder grinding process using natural atmospheric pulverized powder sieved qualified poor ability t crushing and screening plant material and high power consumption, and on-site dust

capacity, environment is poor, there are security risks. It previously widely used at home and abroad for the grinding process with vacuum box below 1,2 milling station

Arts. The main purpose of the grinding process is to pass the powder after grinding as soon as possible from the sieve through the negative pressure inside the suction

ventilation, thereby improving the output of pulverizer and reduce power consumption. 1 shows the process as autistic Screw conveyor is powdered materials, autistic autistic

plate conveyor often

Failure, resulting in air leakage within the screw conveyor, causing the negative pressure in the negative pressure tank lower sieve mill external pressure can not be

guaranteed, a direct impact mill production, so that the grinding process is theoretically feasible, poor stability of the actual operation. 2 shows a grinding process and the

Well eliminate air leakage.

Vacuum tank grinding process accounting and Design Considerations ① mill sieve external pressure must ensure that 800 ~ 1500Pa, pressure is too small, the mill production is

reduced; mill inlet air intake must be arranged in order to ensure adequate air flow into the system. ② vacuum tank

Gas velocity ≤ 2.5m / s, generally choose ≤ 1m / s, the gas velocity is too large, the powder will be sucked away fans, but also to increase the pulse bag filter processing

burden. ③ Selection cyclone discharger must ensure that the fan can handle (the maximum amount of wind turbine by 95% to 98% chose) the actual amount of wind

. Pulse bag filter in use for some time, it will reduce a lot of air volume, resulting in loss of pulse bag filter resistance increase, thus affecting the actual amount of wind

turbine, it reduces the pressure inside and outside the mill sieve, so often crushing system used for some time

Room, its crushing production will decline, so the selection process when the pulse bag filter should be selected air volume fan flow of 1.8 to 2 times.

Fan Selection is the most critical, the general fan air flow by mill sieve area per square centimeter of not less than 0.3m3 / h, normal selection by 0.45 ~ 0.6m3 / h, normal

crushing system centrifugal fan air flow will actually With the loss resistance of the system decreases. Wind turbines

Selection must be based on the calculated pressure system pressure loss (including loss of pressure difference inside and outside the mill sieve) of 1.1 to 1.2 times for the

proper selection. Most of the fan is selected to reduce the power consumption low, system piping speed ≤ 15m / s.

Grinding process with the advantages and disadvantages of the negative pressure box advantages: product powder of the water taken to reduce the body temperature of the powder

product with the grinder 5 ~ 10 ℃; increased sieving ability of the material mill, the mill capacity, compared with a natural crushing pressure increase production 15% to 30%;,

and negative lead

Wind crushed powder can reduce dust and improve the operating environment.

Summary The above is based on maize and cassava as raw material for ethanol production grinding process design and equipment selection process frequently encountered major

problems and countermeasures, not necessarily all right, but I hope it can engage in these aspects of the design, production management, equipment Management has helped people

Help and learn from.