my country is a country with a large population and a large agricultural country. There is a saying that "without industry, there is no wealth; without agriculture, there is no stability; without business, there is no life". Agricultural issues are related to social stability and even human survival. To put it bluntly, food issues are related to social stability and even human survival. We cannot do without food and agricultural products for three meals a day. Even if technology is more advanced, the demand and requirements for agricultural products will only be greater and higher. Unfortunately, the food we eat now is getting worse and worse: the appearance is better and bigger, but we don’t know that many of them are chemically processed, which looks good but not delicious, and even harmful to the body. There are a lot of unknown and shameful secrets in the planting, processing, storage and transportation links, such as adding hormones during planting and raising, fumigating sulfur during processing, adding preservatives during storage and transportation, etc. Now food safety has become a serious social problem, and everyone is in danger.

Agricultural products (including seafood) generally have the following characteristics:

High water content

Meat generally reaches about 50%, and fruits and vegetables generally reach 80-90%. Buying and selling agricultural products is almost like buying and selling water.

Strong seasonality

The biggest problem encountered in the processing and sales of agricultural products is that they are very seasonal. No matter how much money you have, you can't buy the newly listed ones (except greenhouses). During the peak production period, they rot in the fields and trees, and no one wants them.

Easy to rot and deteriorate

Most agricultural products will rot and deteriorate in a few days at room temperature, or reduce nutritional content, or change color and taste. As a result, storage and transportation have become a big problem for agricultural products. The cost of storage and transportation of some agricultural products is far greater than the cost of planting and raising.

Post-processing is required

Some agricultural products need to be processed after picking before they can be used normally, such as tea, tobacco, rice, wheat, cotton, betel nut, vegetable oil, Chinese herbal medicine, etc.

Large production volume

Any kind of agricultural product, even if you have never used or eaten it, actually has a very large production volume, calculated in hundreds of thousands of tons, millions of tons, tens of millions or even tens of millions of tons. A large amount of storage space is required. If cold storage is used, the cost is unbearable for humans.

In order to solve the above problems, the best way is to dry the agricultural products to reduce the water content of the agricultural products, which can save transportation costs, greatly extend the shelf life, effectively achieve supply and demand balance and suppress market price fluctuations, and facilitate consumers to purchase and use.

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Let me tell you a phenomenon: the more developed countries and regions, the less fresh food is consumed, and the more hygienic and clean dry products are consumed. Therefore, drying technology and drying equipment are very important and urgent for us, but this industry has not received enough attention.

Drying is a very old and traditional process. It does not even require human participation. It can be dried by relying on the sun and ventilation. Because of this, it has not attracted much attention. People think what is the point of studying? Just dry it in the sun. Therefore, to this day, the drying and processing of agricultural products in my country is still very backward, mostly relying on the weather and polluting processing. You can pay attention to the dirty ground on the road or on both sides of the highway, and see how much food is dried in your mouth.

For many products, it is okay to dry them in the sun, but no one thinks about whether it can achieve the best effect. Traditional drying is open-loop drying. Even if the weather is very good, there are still problems such as dust pollution and nutrient volatilization and loss.

The bigger problem is, what to do when the weather is bad?

In the past, the production was distributed to households. Every family had a small piece of floor, and every family had surplus labor of the elderly and children. Now this kind of small-scale peasant economy has been eliminated. It is easy for the government to call on farmers to grow and raise crops. The country encourages large-scale and intensive production of agricultural products, but the next problem is storage, transportation and sales. The government is powerless to do this. Farmers can only find ways to do it themselves, mainly by drying and then storing, transporting and selling. However, the drying place after large-scale and intensive farming is a very big problem. It is impossible to distribute it to each household for drying. What should we do if it rains suddenly? Therefore, we must rely on modern drying equipment.

At present, the drying equipment for agricultural products is generally very backward. Most of them use coal and firewood, and a small part uses gas and electricity. The cost is very high, and sometimes it pollutes agricultural products. For example: Betel nut in Hainan Province was originally the top southern medicine and has the effect of preventing and fighting cancer. However, in the past few years, farmers directly burned coal or construction waste to dry betel nut, which made betel nut a carcinogenic product. After CCTV reported it, the purchase price of raw betel nut dropped from more than ten yuan per catty to one yuan per catty, and no one wanted it. The loss of farmers in one year reached more than 10 billion yuan. Since 2013, Hainan Agriculture Department has invested over 100 million yuan in subsidies to promote energy-saving and environmentally friendly drying equipment based on heat pumps. It has not recovered yet, and the lesson is profound.

Drying consumes a lot of energy, and coal and wood for drying are also major contributors to environmental pollution. Now the haze coverage area in my country has reached more than 10%, and it is concentrated in more developed cities, and even hit Japan. Therefore, it is a general trend to control high-pollution coal-fired and wood-fired drying equipment and promote green energy-saving and environmentally friendly equipment based on heat pumps. The country has introduced many very strong subsidy policies.

Heat pump is the only equipment discovered by humans so far with an efficiency of more than 100%. It actually absorbs energy from the environment, has no pollution, and is very easy to control temperature and humidity. Drying has been promoted and used in many provinces and industries in the south, and hot water and floor heating have been applied to Beijing.