Urea sulfate reactor and application thereof

Abstract

The invention provides a urea sulfate reactor and a compound fertilizer production process by using the same. While in use, concentrated sulfuric acid and a high-temperature urea solution are proportioned, then are added into the reactor, and are in full contact with each other in a short time; a large amount of reaction heat, a high-temperature viscous urea sulfate liquid, a high-temperature molten urea and high-temperature high-pressure steam are produced by undergoing a chemical reaction, and the high-temperature viscous urea sulfate liquid and the high-temperature molten urea are atomized and sprayed into a pelleting machine through a narrow and small atomizing spray nozzle under a certain pressure; because the atomized high-temperature materials are directly sprayed on the surface of a material bed of materials in the pelleting machine, the material temperature and the liquid phase amount in the pelleting machine can be increased through contact. The materials in the pelleting machine are pelletized into pellets when the pelleting machine rotates, at the same time, the materials sprayed out from the reactor contain sulfuric acid, sulfuric acid can undergo a chemical reaction with ammonium hydrogen carbonate added in the materials and releases water and a large amount of reaction heat, so the material temperature and the liquid phase amount in the pelleting machine are also allowed to be greatly increased, and thus the materials are more easily pelletized.

Description

technical field [0001] The invention relates to a urea sulfate reactor and a compound fertilizer production process using the urea sulfate reactor, belonging to the technical field of compound fertilizers. Background technique [0002] At present, my country's compound fertilizer granulation generally adopts the steam granulation method, urine spraying method or the upgraded amino acid method. With the continuous advancement of science and technology, very few enterprises have begun to use the sulfuric acid urea ammonification spraying method. The urea sulfuric acid ammoniation spraying method is an advanced granulation method that combines the advantages of the above-mentioned various granulation methods. This method is not only suitable for the compound fertilizers that can be produced by the above-mentioned granulation methods, but also suitable for Or difficult to produce 30-10-10, 16-16-16, 17-17-17, 18-18-18, 15-5-25 and other compound fertilizers, as well as ammonium ...

AI Technical Summary

Problems solved by technology

However, it has been found in practical production that the urea sulfuric acid reactor used in traditional urea sulfur process equipment and its matching equipment such as pipelines, pump valves, etc. are not only complex in structure, troublesome in operation, large in investment (about 400,000 yuan), and short in service life. Moreover, the heat loss in the production process is large, and it is easy to corrode. After corrosion, there are major safety hazards, and the repair and maintenance costs are high.

[0003] Patent No. 201110290323.5 discloses a urea sulfate ammoniated compound fertilizer production process. Because it uses sulfuric acid and urea to react in advance to generate urea sulfate, and then becomes a urea sulfate solution through dilution, the reaction kettle and urea sulfate used for the reaction of sulfuric acid and urea The pipeline has high requirements for corrosion resistance and a large anti-corrosion area; it also reacts with gas ammonia through a tubular reactor, which needs to be invested in an ammonia station, which requires a high level of safety and requires a series of safety facilities, making the structure of the entire equipment complex. High input and operating costs

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