After more than ten years of market development, domestic dryer manufacturing companies have opened up a road for independent research and development of grain low-temperature drying technology in line with China's national conditions. Many invention patents and practical patents have emerged.
"The continuous maturity and development of core technologies not only breaks the monopoly of foreign technology, but also continues to improve on this basis, and we have developed a drying machine suitable for the characteristics of our domestic grain cultivation, which is the popularization of drying machines in the domestic market in the future. Laid the foundation of technology." The responsible person said.
This year's Central Economic Work Conference has for the first time brought food security to the height of the "national strategy."
A person in charge of an Anhui grain drying machinery manufacturing company stated that the country’s emphasis on food security, and that it is downgraded, is that the state has increased subsidies for the purchase of dryers. This has largely solved the pressure on farmers’ friends’ purchase funds. This has also become At present, the main driving force for the vigorous development of the grain drying machinery industry.
According to a report issued by the Ericsson Research Center, the domestic demand for the grain drying machinery industry in China will increase from 1,783 units in 2013 to 2,290 units in 2015. It is expected that the demand will increase by 507 units in two years.
"In recent years, with the slowdown in the growth rate of the nation's manufacturing industry, the agricultural machinery industry is outshone in the entire machinery manufacturing industry. The main reason is that the rigid demand for the agricultural machinery market continues to increase," said Wang Jinfu, general manager of Chery Heavy Industry Co., Ltd. .
Contradictions highlight the fact that one large grain family in Qinping, Henan Province believes that with the increase in land transfer scale, large grain producers must purchase agricultural machinery such as dryers.
"I think that if more than 1,000 acres of land are circulated, dryers and other equipment are indispensable," said the large grain growers mentioned above. At the same time, many large grain producers said that from the perspective of cost, dryers will also become necessary machinery.
“For example, a drying machine can reduce the moisture content of 20 tons of rice from 30% to 16% a day. It takes a cost of 500 yuan, and the artificial lighting to the same level requires a 400 square meter cement field and 8 The labor force carried out more than 3 days of sun exposure, and the cost of employing workers was more than 2,400 yuan,†said one large grain producer.
However, in the eyes of people in the industry, in the fierce competition, China's grain drying machinery market is difficult to hide the chaos of mutual exclusion.
“At present, the market for grain drying machinery is mainly due to the problems of serious homogeneity, disorderly price, disordered quality, and other issues in the market for self-owned brand grain drying machinery. As long as there is a market for new products introduced by one manufacturer, it is reflected in the market. Immediately there will be a lot of manufacturers to follow up. Homogenization makes the new product's life cycle become shorter and shorter, and prices drop again and again." An industry source said.
Wang Jinfu also believes that, from a nationwide perspective, there are still many prominent contradictions in the grain drying industry in China: First, attention needs to be paid, the second is to solve the problem of product supply, and the third is to solve the problem of promotion mode and service guarantee. At present, there is a lack of planning for the development of the domestic grain dryer industry, and the total production volume of products is insufficient. There is no independent brand enterprise with core leading technologies in the industry; the number of dryers is not large; the energy consumption is high due to high drying energy consumption. The quality of dried grains is poor, especially corn, and there is a lack of drying techniques and equipment suitable for rapeseed, soybeans, and cash crops.
The boiler water wall is the main radiation heat surface, arranged inside the boiler chamber and proceeds the heat exchange directly with the high temperature flame. The convection tubes are the convection heat surface of the boiler, arranged between the boiler chamber outlet and the end heat surface and proceed the heat exchange directly with the high temperature fume. The water wall and convection tubes are the main heat surface of the boiler, the tubes diameter for both generally usedΦ 51-60mm boiler steel tubes, also as the request.
The first type is the bare pipe water wall. This is the simplest structure of the water wall. The advantage is that ordinary seamless steel pipes can be used, and it is more convenient to replace the water wall pipe. The disadvantage is that the temperature of the furnace wall is still high, and heavy refractory bricks are required. The steel frame of the corresponding boiler should be strengthened. , The air leakage of the furnace wall is relatively large. Old-fashioned high-pressure boilers and medium and small boilers are used more frequently.
The second tupe is the membrane water wall. The membrane water wall is welded by seamless steel tubes with fins. The Water Wall Tubes are connected by fins to make the water wall into a whole. This kind of water wall is called a membrane water wall. Its function is to strengthen the heat transfer of the water wall and greatly reduce the temperature of the furnace wall. The furnace wall does not need refractory bricks, but only requires thermal insulation materials. Compared with the conventional heavy furnace wall, the weight can be reduced by 60% ~ 70%, the furnace wall heat storage is reduced by 80%, the start and stop time is shortened, and the fuel consumption is reduced. The load of the furnace steel frame is greatly reduced, saving refractory materials and steel.
The third type is the pierced pipe water wall. The barbed pipe water wall pipe is made by welding many grab nails with a length of 20 to 26 mm and a diameter of 6 to 12 mm on the water wall pipe. It is mainly used to lay the gas belt. Generally, for boilers that burn fuel with low calorific value and low volatile content, in order to stabilize the fire, pierced pipe water walls are often used for laying the fire protection belt.
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