A large amount of straw is produced every year. The current ways of using straw include fertilizer, feed, and energy. Straw carbonization is a new way to reuse straw in recent years. The carbonized straw can be used as fuel or used in industry, and even Applied to the soil as biochar. Straw carbonization requires preliminary crushing of the straw, so that the length of the straw can reach 3-5 cm for easy feeding, and the crushed straw can be carbonized.
The straw carbonization machine is a special equipment for carbonization of straw. It uses the "one-fire two-step method" for carbonization. The pulverized straw can be carbonized after four steps in the carbonization machine. The first step is the drying stage, the temperature in the furnace is 120-150 degrees, this process is mainly to evaporate the moisture in the raw materials; the second step is the pre-carbonization stage, at this time, the temperature in the furnace rises to 150-275 degrees, and the straw begins to undergo pyrolysis, hemicellulose will decompose into carbon dioxide, carbon monoxide, and acetic acid; the third step is the carbonization stage, the further pyrolysis of the straw will produce a large amount of combustible gas, as well as wood tar and wood vinegar, the temperature in the furnace at this stage is 275-450 degrees; the fourth step is the calcination stage, when the temperature reaches 450 degrees or more, a lot of heat is still needed to burn the straw carbon, discharge the residual volatile matter, and increase the fixed carbon content of the straw carbon.
After the carbonization of the straw is completed, it needs to be cooled before it can be discharged. At this time, the temperature of the straw carbon is very high, and it will spontaneously ignite in contact with oxygen in the air. Zhengzhou Jiutian carbonization machine has designed a closed air device and a water-cooled discharge machine at the discharge port to reduce the temperature of straw carbon to below 30 degrees.
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