Since time immemorial, humans have been accustomed to using natural heat sources and natural ventilation to dry materials. They are completely constrained by natural conditions and have low productivity. With the development of production, they are gradually replaced by artificially controllable heat sources and mechanical ventilation dehumidification. However, there are five disadvantages in the long-term development of drying equipment in China:
1, no special products
Although China has a large number of drying equipment factories, these plants are mainly concentrated in several regions. One of the important reasons why this situation is caused is that drying equipment is easy to copy, and dozens or even hundreds of companies produce the same model. Cause you can do what I can do, you can't do what I can't do. The brochures and promotional materials of each company are exactly the same, the content is strikingly similar, and patented products are rare, resulting in no special products for all manufacturers. Many drying equipment manufacturers produce the same model, the result is a price competition, the transaction is not backed by the technical content of equipment, but to win with low prices. It is well known that drying equipment is produced in one piece and in one piece. Each device has a certain amount of intellectual investment, and mental work is accompanied by the whole process of drying equipment manufacturing. However, in the economic negotiation with manufacturers, there is almost no technical content in the price of equipment, which means that the drying equipment is completely equivalent to general general equipment. However, the risk borne by drying equipment manufacturers is much greater than other equipment. Without the economical accumulation of drying equipment manufacturers, there will be no technological development costs. It would be easy to imagine that no new aircraft will emerge in recent decades. On the other hand, previous unfavorable technology protection is also one of the important reasons for the low enthusiasm of developers. Drying equipment nameless brand products, developers may consume a lot of manpower and material resources and financial resources for many years of work, once the new model to the market, in a very short period of time there will be a number of imitation products, a new round of price competition to start again. As China's technological protection system is increasingly perfected, this phenomenon of disorderly competition will surely be curbed. It is believed that in the near future, China's drying equipment will be the key to winning with high technology content. The development of our own unique drying equipment and the development of high-tech enterprises will enable our dry industry to embark on a healthy development.
2, behind the level of equipment
A complete drying system consists of a variety of equipment. Drying is an integrated technique involving many disciplines. In addition to the technology of drying itself, it is inseparable from other aspects of knowledge. For example, heating systems involve heat exchange or combustion technologies; electrical appliances involve automatic control technologies; dust removal systems involve heterogeneous separation technologies; and sometimes they involve knowledge of environmental protection. The combination of many existing equipment and various equipment is not reasonable. The phenomenon of so-called big horse-drawn cars is extremely common, causing unnecessary waste. Mainly in the system design, can not consider the relationship between various parameters and supporting equipment according to the actual situation.
For example, convection dryers are designed with different locations in which the equipment is installed, the air volume and the heat load of the heat exchange equipment are not the same, resulting in different types of fans, and there are numerous examples. The main reason is that the meaning and influence factors of each parameter are not really understood. In addition, the level of standardization and serialization of equipment is also relatively backward, and the interchangeability is poor, that is, the interchangeability of equipment produced by the same manufacturer is not satisfactory. Some foreign manufacturers compile numbers of all products of the factory, as long as the user asks which number of parts to provide the same parts as the original, and the user is very convenient when repairing the equipment. The reliability of the parameters given in the specifications of many domestic manufacturers is not high, and the specifications of the equipment are too rough and incomplete, which increases the difficulty of user selection. Another reason for the backwardness in the level of equipment is that the level of control and the level of mechatronics are not high. The problems related to this aspect have already been mentioned above, but there is not much discussion here.
3, large-scale technology behind
Drying equipment used in petrochemicals and inorganic chemicals has a large amount of processing. Many of our equipment have not been manufactured so far. There are many reasons for the backwardness of large-scale equipment technology. First, in the past production, the output of various industries in China was relatively small. Most of them have not yet formed a true economic scale, and they cannot effectively stimulate the enthusiasm of large-scale equipment research.
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