Small Papermaking Equipment Industry Development Prospects

　　Paper itself has high humidity and high cohesiveness. The traditional small-sized papermaking could not meet this requirement. The “Third-stage multi-loop” small papermaking special paper for papermaking adopts a unique breaking device to disperse the bonded paper. Post-drying increases the contact area between papermaking and hot air, which greatly improves the heat utilization rate. After drying, papermaking can reduce the moisture content to 12% at a time. After drying, papermaking can be directly used as fuel. . Make papermaking become a treasure. In addition, after years of unremitting efforts, our company's R&D department can use boiler tail gas as a heat source for papermaking small papermaking, and successfully launches small-scale paper making using boiler exhaust gas. There is no investment in heating, no cost in heat. Really energy-saving and dry, truly energy saving and environmental protection.

　　Pre-drying equipment service The chemical industry's distinguishing feature is the increasing importance of technical content. This is very different from selling products in the past mainly by price competition. Among them, some manufacturers of drying equipment with high technological content, focusing on the development of new products, have gradually increased their effectiveness; conversely, some enterprises with low technological content and new and new technology development capabilities have begun to decline in efficiency.

　　The principle is approximately the same, the bottom of the cone is tangentially fed into the air, the middle of the cylinder is filled with material, and the bottom is set with stirring, which can continuously disperse the filter cake or slightly sticky particles. The finer particles are swirled with the gas stream, and the particles corresponding to the gas velocity can be discharged through the craters at the top of the vessel. Its maximum output can reach 8t/h. The difference with flashlight small papermaking is mainly in the bottom structure and the air intake type.

　　This equipment is an additional vibration source for the air distribution plate or the whole machine to the fluidized drying equipment. Because the operating gas velocity can be reduced, especially for materials with uneven particle size distribution, both the drying rate and the thermal efficiency can be improved, and it has been widely used.

　　Department of the tray is divided into special cars on the car can be intermittent in and out of the ramp to increase production and increase thermal efficiency. Other structures are similar to box-type small papermaking.

　　When the airflow is used to affect the critical speed and the take-out speed of the dried material particle group, the particles form a fluidized motion, thereby enhancing the heat transfer and mass transfer of the particles, and are often used in fine chemicals and pharmaceutical products.

　　Its structure is a vertical cylinder with several layers of rotating disks. The material can be added at the top and dropped down to the bottom. The hot air is introduced from the bottom. The air is circulated by several blower turbine impellers arranged in the center of the cylinder, and a heater is arranged at the corresponding height of the inner wall of the drum to supplement the heat of the air and increase the thermal efficiency and the drying rate. However, the equipment is not easy to clean. It is more difficult for multi-species production and materials that require cleanliness.

　　It can be used to dry corn, cereals, vegetables, etc. This machine is equipped with a belt made of stainless steel mesh. The material moves with the belt and can be heated in sections. The unit is a unit of 1.8 to 2 meters in length and can be connected up to 40 meters in length. The throughput can be as high as 4 tons per hour. During the constant drying phase, the hot air temperature can reach 130°C, and the relative humidity of the exhaust can reach 85%.

　　After the material liquid or suspension is atomized, the droplets are dried directly with hot air to form a powdery product. Nebulization methods include centrifugal spray, pressure spray, and air spray. In the drying room design, the introduction of hot air has a great influence on the drying process. In addition, the temperature of imported hot air is highly dependent on the thermal efficiency. The higher the temperature, the higher the thermal efficiency. General inlet air temperature is 150°C and thermal efficiency is about 30%.

　　In addition, the progress of drying technology will also reverse the current domestic export situation of drying equipment. At present, China's drying equipment has not yet formed an export scale, and its export volume is still less than 5% of the total, and it is mainly sold to Southeast Asia. However, according to the authoritative forecast, with the development of technology, the proportion of China's export drying equipment in total production will increase from 5% to 10% in the next few years, and the export market will also expand from Southeast Asia to Europe and the United States. The large gap between the domestic level of large-scale drying equipment manufacturing and the international level is expected to improve. The

　　China's drying industry started late and has a weak foundation, but it has developed rapidly. The rapid development of industry and agriculture and science and technology have led to the development of drying equipment and better performance in the market. Drying equipment plants have mushroomed. Some companies have a high starting point, adhere to the development of science and technology, and play a catalytic role in the development of the drying industry. However, there are also “strategic brands” with low investment and low technical content. Extending the market with a large number of low-quality, low-cost equipment has not only affected the overall image of the drying equipment, but has also caused a “neutral” in domestic drying equipment prices. A good product cannot sell at a good price, and a good product cannot compete with a product. Low-tech production

　　Rotary drum Small paper is a slightly inclined horizontal cylinder. Convection of material and hot air through small papermaking is an earlier model. Although the structure is simple, the thermal efficiency is high, allowing high temperature operation. Now the mine or inorganic chemical industry and coal washing and drying industry are the most widely used. Rotary drum small papermaking is very adaptable to various materials, such as sludge, slag, river sand, paper, desulfurized gypsum, bean dregs, wine slag and other high moisture high bonding materials have unparalleled advantages. Over the past few years, the improvement of the structure of the lifting plate (copying board) in the cylinder, the addition of heating pipes, breaking devices and lining sleeves, etc., have made the performance of small-sized papermaking drums ever-increasing, and the application range has been increasing.

　　Flash small-scale papermaking is carried out by heating the air in a conical bottom and stirring it so that the falling filter cake is dispersed by strong stirring. After drying, the fines can be collected with the air flow to a cyclone or bag filter. It can be used to disperse cakes or granular materials with a certain viscosity.

　　The hot air is carried along with the particles and dried by heat. In order to increase the relative velocity of airflow and particles and increase the heat and mass transfer rate, a variable diameter is added on the basis of straight pipes, and a pulsed air dryer is made. The drying efficiency of pulsed airflow is lower than that of the original straight pipe. Cyclone airflow is a little higher for small papermaking. In addition, the drying space is made into a jacket cylinder, in which the hot air and the material are tangent to the upper part of the cylinder, and the cyclone airflow mini-paper produced by the central tube is used to continuously heat the air and materials during the drying process. There are now many improvements in the extension of the dwell time, such as scroll type, sleeve type, etc. This kind of small-sized paper is mainly suitable for bulk, moisture-absorbing materials

　　Box type small papermaking is one of the oldest drying equipment. The material is loaded on a plate, the material plate is placed on the rack and discharged one by one, and steam or electricity is used as a heat source. The hot air inside the box can be recycled and partially discharged to make the drying uniform. Although the thermal efficiency is low, it is still being used in large quantities and continues to be manufactured. The reason is that the structure is simple and there are no obvious problems with the operation. However, many materials must be turned over and turned during drying. The heat-sensitive materials are often susceptible to discoloration and are not suitable for drying materials with solvents. Due to the accumulation of materials, the inner layer has poor heat transfer and mass transfer, and thus the drying rate is low.

　　Products are not squeezed into the big market, and “operational profitability” makes many advantageous companies have no advantage in the market, so that the overall competitiveness of China's drying industry can hardly be played. Welcome to our website www.1978st.com, more papermaking equipment, paper machine information