Continuous production method of granular humic acid urea and activation reactor

Abstract

The invention relates to a continuous production method of granular humic acid urea and an activation reactor. The method comprises the following steps of: mixing granular urea and decomposed coal or brown coal with a catalyst; performing activation reaction on the mixture in the activation reactor; and cooling, crushing and prilling to prepare the granular humic acid urea fertilizer. A heat transfer jacket is arranged between an inner tank body and an outer tank body of the activation reactor. The tank body is internally provided with three stirring shafts. Interlayers are arranged on the side walls of the stirring shafts. Each spiral blade is internally of a hollow structure. Heat transfer oil is filled in the heat transfer jacket, the heat transfer interlayers and the hollow structures of the spiral blades. According to the invention, the process is short in reaction time, the activation reactor is heated adequately and uniformly, and urea is not crushed or melted, so that the energy consumption of whole production is greatly reduced.

Description

technical field [0001] The invention relates to a method for continuously producing granular humic acid urea by reacting weathered coal or lignite with urea, and belongs to the technical field of agricultural fertilizer production. Background technique [0002] my country is a big country in the use of fertilizers, and urea is one of the most important nitrogen fertilizers. The annual output of urea is about 55 million tons, and the domestic use is about 43 million tons. However, the utilization rate of urea in farmland is low, only 30%-35%. Part of nitrogen volatilizes in the form of ammonia and nitrous oxide or leaches into groundwater in the form of nitrate, causing environmental pollution and waste of resources. [0003] In order to improve the utilization efficiency of nitrogen in urea, scholars have conducted a lot of research and developed a variety of technical means and methods to improve the utilization efficiency of nitrogen in urea. Under certain conditions, ure...

AI Technical Summary

Problems solved by technology

This method uses molten urea, and its limitation is that the production must be connected with the urea production process. If this method is used in areas far away from urea production plants, the energy consumption will be too high and it is not suitable for large-scale production.

Chinese patents CN102153424A, CN1169975A, CN102260111A, and CN102249814A disclose the reaction conditions of the complexation of urea and humic acid and the process of producing fertilizers. The method adopted in these patents is to perform solid-liquid separation after the two fully react and then add or not add other raw materials Made into fertilizer, it is not suitable for large-scale production and application due to the high energy consumption of the solid-liquid separation process

Chinese patents CN1887819A and CN1580005A disclose the method of making fertilizer with urea and humic acid. The method of these two patents is to directly mix the two, and then add other raw materials to granulate. There is no reaction between the two, which is a simple mixed fertilizer process. Among them, the effect of humic acid is difficult to exert, and it cannot effectively improve the utilization efficiency of nitrogen in urea

The equipment uses steam heating, which is difficult to achieve stable temperature control, which affects the best reaction effect of humic acid urea. Two screw propellers are used, and the production efficiency is low.

Images