Ammoniation granulator and composite fertilizer production novel technique

Abstract

The invention relates to an ammoniation granulator and a compound fertilizer production technology by an amino acid method, aiming at solving the technical problems in the compound fertilizer production process that: biuret is easy to generate, the granulating effect is not good, the production efficiency is low and the energy consumption is high. An amino acid distributor of the ammoniation granulator is respectively and independently arranged, an amino spraying branch pipe provided with an inclined plane spout has an angle of 30 to 60 degrees with a vertical line on the cross section of a cylinder, the rotating directions of the inclined plane spout and the cylinder are consistent; the spout of an acid spraying branch pipe is correspondingly arranged in the opening direction of the inclined spout of the amino spraying branch pipe; and when ammoniation granulating, the granulator sprays liquid ammonia in a material layer with the pressure of 0.5 to 1.0MPa through the amino distributor, an acid distributor sprays sulphuric acid of 50 to 70 percent in the material layer with the pressure of 0.2 to 0.5Mpa, and each ton of solid material is injected with 15 to 25kg of liquid ammonia and 16.8 to 39.2kg of dilute sulphuric acid. The invention is applied in various raw materials and suitable for the scale production of various compound fertilizers; and the finished products have perfectly round and solid particles, are water resistant and movement resistant and not easy to be crushed and agglomerated.

Description

technical field [0001] The invention relates to a granulation device and a compound fertilizer production process, in particular to a compound fertilizer ammoniation granulator and a new compound fertilizer ammonia production process. technical background [0002] my country's compound fertilizer production began in the 1970s and developed rapidly after entering the 1980s. Especially since 1990, compound fertilizers have been increasing at a rate of 1 million tons (physical volume) almost every year, and have gradually shifted to the production of high-concentration nitrogen, phosphorus and potassium compound fertilizers. Nevertheless, the current application of compound fertilizers in my country only accounts for about 25% of the total application of chemical fertilizers, and the domestic production of compound fertilizers only accounts for 20% of the total output of chemical fertilizers, and they are mainly low-concentration compound fertilizer products. According to the ...

AI Technical Summary

Problems solved by technology

[0005] 1. Sulfuric acid-ammonia tubular reactor type granulator, see figure 1 In the figure, 12 is the drum body, 13 is the feed inlet, 15 is the ammonia tube reactor, 16 is the gas ammonia pipeline, 17 is the sulfuric acid pipeline, 18 is the tail water suction pipeline, and 10 is the gas-solid separation chamber of the granulator , 9 is the discharge port, and 11 is the tail gas outlet. When this type of granulator is ammoniated and granulated, the acid neutralization reaction is carried out in the tubular reactor. Due to the large heat generated during the reaction, the temperature of the ammonium sulfate solution As high as 300-350°C, in the case of such high temperature and the presence of amino acid at the same time, the corrosion of the tubular reactor 15 will be aggravated, resulting in a shortened service life of the tubular reactor; If there is urea, the local high temperature generated will easily decompose urea to produce biuret, which will increase the content of biuret in the compound fertilizer and cause damage to crops; Requires complex scrubbing piping system

[0006] 2. Traditional sulfuric acid-ammonia nozzle type granulator, see figure 2 12 in the figure is the drum body, 13 is the feed inlet, 20 is the liquid ammonia distributor, 19 is the sulfuric acid distributor, 10 is the gas-solid separation chamber of the granulator, 9 is the discharge port, and 11 is the tail gas outlet. When the type granulator is ammonified and granulated, the sulfuric acid is sprayed on the material layer, and the liquid ammonia is sprayed directly in the material, so the distribution of the amino acid is easy to be uneven, and the sulfuric acid will react with other materials.

[0010] Among them, the reaction of ① and ② will increase the loss of materials, and the reaction of ③ will lead to the phenomenon of "mixing mud" in the granulator, making the granulation impossible.

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