The main material in the desulfurization project is limestone powder (the fineness is generally required to pass 90% of 325 meshes or 95% of 250 days), and the preparation of limestone powder is generally divided into vertical roller mill process and ball mill process. As the desulfurization problem has become particularly prominent in recent years, the type of pulverizing process used is also the key to the success of the desulfurization project. Therefore, HLM type desulfurization stone vertical roller mill pulverizing process is recommended.

HLM desulfurization stone powder vertical roller mill is a high-efficiency energy-saving drying and grinding equipment developed by HCMilling(Guilin Hongcheng) on the basis of widely absorbing foreign advanced technology and summarizing the application experience of vertical roller mills at home and abroad. The utility model not only has the advantages of turning over the roller for maintenance of vegetable break mill, but also has the characteristics of turning over the roller sleeve for MPS mill and long service life. It integrates fine crushing and drying, grinding, powder selection and transportation, and has the advantages of high grinding efficiency, low power consumption, large drying capacity, easy adjustment of product fineness, simple process flow, small floor area, low noise, no dust pollution, low wear, convenient maintenance and reliable operation.

Main structure and application of HLM desulfurized stone vertical roller mill: HLM vertical roller mill for desulfurized stone powder consists of separator, grinding roller, grinding disc, pressurizing device, vertical reducer, motor and shell And so on. Separator is an important part to ensure product fineness. It is composed of adjustable speed drive, rotor, shell, air outlet, etc., and its working principle is similar to that of powder concentrator. The grinding plate is fixed on the outlet shaft of the vertical reducer, and there is an annular groove on the grinding plate, which is the rolling groove for grinding materials. The grinding plate consists of a plate seat, a lining plate and a stopper Ring, etc. The pressurizing device is an important part to provide grinding pressure, which is composed of high-pressure oil station, hydraulic cylinder, pull rod, accumulator, etc., and can apply sufficient pressure to the grinding roller to crush materials. The vertical reducer should not only slow down and transmit power, drive the grinding plate to rotate, but also bear the weight of the grinding plate and grinding pressure.

Advantages of desulfurization stone powder vertical roller mill:

1. High grinding efficiency

The desulfurization stone powder vertical roller mill uses the material layer grinding principle to grind materials, which has low energy consumption. The power consumption of the grinding system is 20%~30% lower than that of the ball mill, and with the increase of raw material moisture, the power saving effect is more significant.

2. Large drying capacity

Desulfurized stone powder vertical roller mill adopts hot air to transport materials. When grinding materials with large water content, the inlet air temperature can be controlled to make the products reach the required final water content. Materials with moisture content up to 15% can be dried in the vertical roller mill.

3. The chemical composition of the product is stable

The particles are uniformly graded, which is conducive to the calcined materials staying for only 2min~3min in the vertical roller mill, while 15min~20min in the ball mill. Therefore, the chemical composition and fineness of desulfurization stone powder vertical roller mill products can be quickly measured and corrected.

4. Simple process, small footprint and space

The vertical roller mill for desulfurized stone powder is equipped with a powder concentrator, which does not require additional powder concentrator and lifting equipment. The dust bearing gas from the mill can be directly collected by a high concentration bag filter or an electric dust collector, so the process is simple, the layout is compact, and it can be arranged in the open air. The building area is about 70% of the ball milling system, and the building space is about 50%~60% of the ball milling system.

5. Low noise, less dust and clean operating environment

The vertical roller mill for desulfurized stone powder does not directly contact the grinding roller and the grinding disc during operation, and there is no metal impact sound of steel balls colliding with each other in the ball mill, so the noise is low, 20~25 decibels lower than that of the ball mill. In addition, the vertical roller mill for desulfurized stone powder adopts a fully sealed system, which operates under negative pressure without raising dust and with a clean environment.

6. Abrasive body has low wear and high utilization rate

Since there is no direct contact between metals during the operation of the vertical roller mill for desulfurized stone powder, the abrasion of its grinding body is small, and the abrasion per unit product is generally 5~10g/l.

Comparison between vertical roller mill and ball mill process plan of desulfurization stone powder: the process flow of desulfurization stone vertical roller mill is “primary dust collection system”. It has the advantages of simple process flow, fewer system equipment, fewer system failure points, convenient system operation, flexible process layout, and no wear of the main fan impeller of the system. However, a high concentration dust collector is required, and the investment is relatively large. The technological process of ball milling is “two-stage dust collection system” “. It has the characteristics of complex process flow, many system equipment, many system failure points, difficult system operation, many process layout constraints, and large floor area. Although it does not need to configure a high concentration dust collector, the relative investment is also large. When the enterprise is building, expanding, or technical transformation, it mainly considers the economic and social benefits, such as the size of investment, the length of loan repayment period, operating costs, and maintenance costs Environmental protection, fixed number of operators, safe operation, convenient maintenance and other factors. Taking the limestone powder preparation system with an annual output of 300000 tons as an example, the relevant indexes of the vertical roller mill and ball mill using desulfurization stone powder are compared. The middle discharge drying mill system with central drive has nearly 50% more investment than the vertical roller mill system, while the technical and economic indicators are lower than the desulfurization stone vertical roller mill. In particular, the power consumption per unit product of the desulfurization stone powder vertical roller mill system is 20% lower than that of the central drive intermediate discharge and drying mill system.

It can be seen that the desulfurization stone vertical roller mill is superior to the ball mill grinding system in terms of both technical and economic indicators. Although the price of desulfurization stone powder vertical roller mill is higher than that of ball mill, the desulfurization stone powder vertical roller mill system is only about 50% of that of ball mill system. In terms of other technical indicators, the desulfurization stone powder vertical roller mill is also more advanced. If you are interested in selecting limestone vertical roller mill, please contact us for details.