Coal-firing agricultural soil hot water sterilization machine

Abstract

The invention relates to a hot water sterilizing machine applied to agriculture by burning coal, belonging to the field of agriculture equipment. A furnace of the sterilizing machine of the invention is divided into a coal furnace and a fire furnace by a fire grate, the top of the coal furnace is connected with an air inlet pipe, a boiler barrel comprises water space in the lower part and negative pressure vacuum space in the upper part, the negative pressure vacuum space is internally provided with a recuperator tube connected with the outside, the water space is internally provided with heat pipe bundles to form a gas duct. The hot water sterilizing machine applied to agriculture by burning coal can combine a vacuum boiler, gasification wraparound burning and a membrane wall heat transmission structure and continuously provide hot water with the temperature of 90-95 DEG C, has high thermal utilization factor and generates little pollution to the environment, in addition, optimal combination is carried out on the structure of the invention, so that the sterilizing machine has small volume, high thermal efficiency and good mobility. With a membrane-beneath irrigation system adopted, the high temperature hot water obtained in the invention is irrigated in soil or ground substances to heat the soil or ground substances to 50-60 DEG C which lasts for 1-2 hours, thus killing a large amount of mixed fungus in the soil and restoring land capability of the soil.

Description

technical field [0001] The invention relates to mechanical equipment for restoring soil fertility in agricultural facilities, in particular to a coal-fired soil hot water sterilizer for high-temperature disinfection of facility soil diseases and insect pests. Background technique [0002] Since the reform and opening up, with the rapid increase of Chinese people's demand for vegetables, the area of ​​facility vegetables has developed rapidly, and the area of ​​various facilities has reached 3.2 million hm2, of which the area of ​​various types of greenhouses, mainly high-efficiency and energy-saving solar greenhouses, has exceeded 300,000 hm2. The growth cycle of facility vegetables is short, and there are many stubble changes. The soil-borne diseases of the planting soil are serious year after year, especially the occurrence of root-knot nematodes has greatly affected the vegetable yield. Diseases have become a prominent problem in the production and development of protecte...

AI Technical Summary

Problems solved by technology

[0004] 1. Fumigation disinfection of chemicals such as chloropicrin and methyl bromide: the method is to pour highly toxic chemical substances into the soil, use shed film to seal high-temperature fumigation to kill soil diseases and insect pests, and finally open the shed to disperse the toxicity of the chemicals. The problem is that the disinfectants are highly toxic and costly. Professionals are required to deal with them, and they also cause great pollution to the workers and the atmosphere. At present, they are basically not used.

[0005] 2. Calcium cyanide ammonium is also called lime nitrogen disinfection method: the method is to spread calcium cyanide ammonium on the soil surface, and then spread straw and other organic matter, plow, pour water, cover film and then seal the shed, due to the production of calcium cyanide ammonium High cost, high toxicity, not suitable for the production of pollution-free vegetable products, and incomplete disinfection, so the application is also limited

[0006] 3. High-temperature steam disinfection: the method is to spray high-temperature hot steam into the soil matrix and use hot steam to kill soil diseases and insect pests. Due to the limited steam penetration, it is mainly used for substrate disinfection of soilless cultivation and cannot be used for soil disinfection.

[0007] 4. Fuel oil hot water disinfection: The method is to use diesel fuel to heat the water and pour it into the soil with a water separator to directly kill the harmful microorganisms in the soil at high temperature for a long time. The advantage is that it has no pollution to the soil and no chemical pesticide residues. The disadvantage is that the equipment used in this technology is imported from South Korea, the cost is very high, the price of fuel and diesel is high, and the application cost is high. It is not suitable for China's national conditions and cannot be widely used.

However, the existing coal-fired boilers cannot achieve the effect of producing high-temperature hot water for a long time to achieve sterilization

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