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What are the types and characteristics of pneumatic conveying equipment commonly used in cement plants?

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the production process of cement is generally summarized as two grinding and one burning, which is divided into three stages: after crushing calcareous raw materials, clay raw materials and a small amount of correction raw materials, they are mixed, ground and mixed into raw materials with appropriate composition and uniform quality according to a certain proportion, which is called raw material preparation; The process of calcining the raw meal in the cement kiln to partial melting to obtain the Portland cement clinker with calcium silicate as the main component is called clinker calcination; Clinker is ground into cement by adding an appropriate amount of gypsum, mixed materials or additives, and packaged or delivered in bulk, which is called cement grinding and delivery. Pulse pneumatic conveying system has the advantages of high productivity (material gas ratio m up to 30 ~ 300), long conveying distance (up to 500m), low gas consumption, low conveying wind speed (generally only 1 ~ 2m /s), less pipeline wear, difficult material crushing in the conveying process and low energy consumption. Therefore, it is a promising pneumatic conveying mode

pneumatic conveying equipment has good dust-proof effect; It is convenient to realize mechanization and automation, reduce labor intensity and save manpower; In the conveying process, a variety of process operations can be carried out at the same time, such as mixing, crushing, sorting, drying and cooling. It has the advantages of preventing materials from moisture, pollution or mixing with sundries, so it has been applied in casting, metallurgy, chemical industry, building materials, grain processing and other departments. Its main disadvantage is large power consumption; The equipment (mainly separator population) and pipeline (mainly elbow) wear quickly. If the design, construction or operation are improper, it is easy to cause material deposition, blockage and interruption of transportation; It is not suitable to transport materials with high humidity, high viscosity or easy to break. Pneumatic conveying equipment is generally composed of feeder (such as throat, suction nozzle, transmitter, etc.), conveying pipe, air pipe, separator (commonly used are volumetric and cyclone), air lock (commonly used are flap and rotary, which can be used as both feeder and discharger), dust collector and fan (such as centrifugal fan, roots blower, water ring vacuum pump, air compressor, etc.). The function of the material receiver is to feed materials to create an appropriate material gas ratio and start and accelerate the materials. The function of separator is to separate materials from air and sort materials. The function of air lock is to evenly supply or discharge materials and prevent air leakage at the same time. The function of the fan is to provide power for the system. High pressure centrifugal fan or water ring vacuum pump are commonly used in vacuum suction and delivery system; The pressure delivery system needs roots blower or air compressor

pneumatic conveying equipment can be divided into suction type and pressure type according to different working pressure. According to the vacuum degree of the system, the suction type can be divided into low vacuum (vacuum degree is less than 9.8kpa) and high vacuum (vacuum degree is 40 ~ 60kpa). The pressure feeding type can be divided into high pressure [pressure (1 ~ 7) according to the action pressure of the system × 105Pa] and low pressure (pressure at 0.5 × Below 105Pa). In addition, there are a mixing system with both suction and pressure in the system, a closed circulation system (air is closed circulation, and all materials can be recovered) and a pulse pneumatic conveying system. The low vacuum suction system and pulse pneumatic conveying system are briefly introduced below


pneumatic conveying equipment commonly used in cement plants include pneumatic lift pump, screw pump, bin pump, etc; The pneumatic conveying system consists of pneumatic conveying equipment and pipelines. Compared with other conveying equipment, although it has the characteristics of flexible layout, small floor area and centralized, decentralized, high height and long-distance conveying of powder materials, it needs to be equipped with a compressed air system with high power consumption. From the perspective of energy saving, it is advocated to use machinery instead of pneumatic conveying. At present, pneumatic lift pumps are used at the kiln tail to transport raw meal to the preheater

common equipment in cement plant: 1. Coal pre homogenization equipment, coal mill, rotor scale, preheater, rotary kiln, cooler, etc. in firing workshop. 2. Cement workshop: cement mixing, roller press, cement mill, packaging machine, etc. 3. Raw material workshop: limestone crusher (hammer breaking, jaw breaking, etc.), stacker reclaimer and raw material mill for limestone pre homogenization. 4. Various metering belts, belt fans and fans are equipped with circulating water system

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