A kind of acid mixing equipment and acid mixing method for industrial production of urea ammonium nitrate solution

Abstract

The invention provides acid mixing equipment for industrially producing urea and an ammonium nitrate solution. The acid mixing equipment comprises a cylinder body, an upper sealing head and a lower sealing head, wherein a water feeding hole, a pressure gauge interface and an exhaust hole are formed in the upper end of the upper sealing head, a nitrogen inlet is also formed in the center of the upper end of the upper sealing head, an acid outlet is formed in the lower end of the lower sealing head, a level gauge is arranged on the side wall of the cylinder body, an acid inlet is formed in the upper part of the side wall of the cylinder body, a sampling hole is formed in the lower part of the side wall of the cylinder body, a nitrogen pipeline is axially arranged in an inner cavity of the cylinder body, one end of the nitrogen pipeline is connected with the nitrogen inlet, the other end of the nitrogen pipeline is arranged at the bottom of the cylinder body and is provided with a gas distributor, the gas distributor is formed by pipelines in a crossing mode, and an air hole is formed in the bottom of each pipeline of the gas distributor. With the adoption of the acid mixing equipment, the diluted ammonium nitrate solution is colorless and transparent and does not have influence on colors of UAN product quality; in addition, as dilution and conveying of the ammonium nitrate are combined into a whole, control and operation are convenient. The invention also provides a method of mixing acid by adopting the acid mixing equipment.

Description

technical field [0001] The invention relates to acid mixing equipment, in particular to an acid mixing equipment and an acid mixing method for industrially producing urea ammonium nitrate solution. Background technique [0002] Urea Ammonium Nitrate solution (Urea Ammonium Nitrate solution), referred to as UAN solution, also known as nitrogen solution (N solution) abroad, is prepared from urea, ammonium nitrate and water. [0003] The pH value control of the solution in UAN production is a necessary step. Generally, dilute nitric acid with a concentration of 25-35% is added to the semi-finished solution to control the pH value. However, there is no nitric acid solution of this concentration and quality in industrial production, and it generally needs to be diluted with water. This operation is not easy to control. Adding water directly to dilute nitric acid will cause exothermic reaction to generate nitrogen dioxide and other gases. When the gas is dissolved in nitric acid, ...

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Problems solved by technology

[0003] The pH value control of the solution in UAN production is a necessary step. Generally, dilute nitric acid with a concentration of 25-35% is added to the semi-finished solution to control the pH value. However, there is no nitric acid solution of this concentration and quality in industrial production, and it generally needs to be diluted with water. This operation is not easy to control. Adding water directly to dilute nitric acid will cause exothermic reaction to generate nitrogen dioxide and other gases. When the gas is dissolved in nitric acid, it will produce yellow color and affect product quality. Therefore, the solution diluted with nitric acid is generally added by adding air or Dissolved gas is blown out by nitrogen, etc., which is called bleaching process, and the operation of adding nitric acid to UAN preparation tank is not easy to control and measure

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