The development of grain SLT-High Speed Centrifugal Spray Dryer in China

China is the most populous country in the world, and food production security is always the top priority of the country. China as the world's largest food producer and consumer, in ensuring the sustainable development of grain production has adopted a series of effective measures, from 2004 to 2004, 8 consecutive increase in grain production, in 2011, the national grain output reached 1.1424 trillion tons (571 million tons), created a new record in domestic food production. Faced with several years of harvest, grain in cherish the hard-won good situation in agricultural development at the same time, we are also think about how to reduce food after harvest because of the weather changes, such as drying production losses. According to the statistics of the relevant departments, the food losses caused by the effects of climate change, such as mildew and germination, are as high as 5%. If you produce 500 million tons of grain a year, the equivalent of 25 million tons of food is broken. Therefore, in this sense, it is imperative to develop grain SLT-High Speed Centrifugal Spray Dryer.

1. Concept of grain SLT-High Speed Centrifugal Spray Dryer

Grain drying is an important step in agricultural production and a key link in agricultural production, which is an important part of the whole mechanization of grain production. Grain SLT - high-speed centrifugal spray drying technology in machinery as the main means, and apply the corresponding technical measures, artificially controlling factors such as temperature, humidity, without prejudice to the premise of grain quality, reduce the water content in the grain, to the national security storage standard drying technology.

Ii. Classification and advantages of grain SLT-High Speed Centrifugal Spray Dryer

Classification of grain dryer:

1. According to the heating mode, the dryer is divided into flow type, conduction type, radiant type and dielectric type.

(1) for the flow dryer, the direct drying machine is also called, which is to use the hot drying medium to direct contact with wet materials, to transfer heat by convection, and to take the generated steam away;

(2) conduction type dryer is also called the indirect dryer, it USES the conduction way by heat transfer heat to the wet material through metal partition, the generated moisture vapor available vacuum suction and ventilation with a small amount of purge gas or in a separate set of low-temperature condensation on the condenser surface method. This kind of dryer does not use the drying medium, the heat efficiency is higher, the product is not polluted, but the drying ability is limited by the heat transfer area of the metal wall, the structure is also more complex, often in the vacuum operation;

(3) the radiant dryer is the electromagnetic wave that USES various radiators to emit a certain wavelength range, which is selectively absorbed by the wet materials and then converted into heat to dry;

(4) the dielectric drying machine is used to make use of high frequency electric field to dry the internal heat effect of wet materials.

Advantages of the above dryer:

With high performance evaporator, large heat transfer area, low heat transfer temperature, and more stable air temperature of evaporator outlet.

High efficiency gas water separation structure, high oil and water separation efficiency.

2. The drying machine can be divided into fixed bed type, agitating type, spray type and composite type according to the movement mode of wet materials;

3, according to the structure, the dryer can be divided into the van, drying machine, drying machine, roller conveyor type dryer, vertical drying machine, the mechanical agitation type drying machine, rotary dryer, fluidized bed drying machine, pneumatic dryer, vibration dryer, spray dryer and combined-type dryer, etc

3. Development trend of foreign grain SLT-High Speed Centrifugal Spray Dryer

Grain drying machines abroad research started in the 1940 s, 50 s and 60 s developed countries basically realized the grain SLT - high speed centrifugal spray drier, 60 s and 70 s grain drying automated, in the 70 s and 70 s grain drying to the high efficiency, high quality, energy saving, reduce costs, computer control direction, after 90 grain drying equipment has been achieved seriation, standardization. In recent years, the computer simulation of grain drying process has made great progress, the continuous development, traditional software and proprietary software to the design of grain drying machines and product quality improvement has played a very important role.

Japan is one of the countries with the highest degree of global grain SLT-High Speed Centrifugal Spray Dryer. Its grain drying machinery industry has a long history and deep research and development strength. Japanese grain SLT - high speed centrifugal spray drier started in the late 1950 s, through continuous progress of science and technology, especially the policy of the government support, its technical level has the world leading position, grain SLT - high-speed centrifugal spray drying rate of 92%.

At present, the countries or regions where rice is widely cultivated, such as Japan, South Korea and Taiwan, actively promote the development of rice conditioning and drying equipment. In 2009, the number of Japanese rice conditioning drying equipment was about 25,000. Rice conditioning drying machinery manufacturers, such as Japanese yamamoto, with bamboo, shizuoka, and gold, the south Korean international, Han Cheng, emerging and Taiwan's keep on this kind of type as a basic model of the rice drying.