A granulator containing double-tube reactors and its application in the production of diammonium phosphate

Abstract

The invention provides a granulator comprising double tubular reactors. A main beam is arranged on the upper part of the granulator. A No.1 tubular reactor and a No.2 tubular reactor are respectively arranged on the two opposite sides of the granulator. According to the No.1 tubular reactor, an ammonia distributor is inserted into a granulator feed layer through a plow-type steel part welded on the main beam. A liquid ammonia delivery pipe is arranged on the end of the No.1 tubular reactor positioned on the outer side of the granulator. According to the No.2 tubular reactor, an ammonia distributor is inserted into a granulator feed layer through a plow-type steel part welded on the main beam. A liquid ammonia delivery pipe is arranged on the end of the No.2 tubular reactor positioned on the outer side of the granulator. A washing liquid circulation tank is respectively connected to the upper parts of the No.1 tubular reactor and the No.2 tubular reactor through tubular reactor feeding pumps. The working pressure of the equipment is lower than that of single tubular reactors. A blocking frequency is substantially reduced. Single tubular reactor purging frequency is reduced to once per shift. A cylinder scale phenomenon close to a spray point is inhibited.

Description

technical field

[0001] The invention relates to a novel granulator applied to diammonium phosphate, specifically a granulator containing double-tube reactors, which is applied to the granulation of diammonium phosphate. Background technique

[0002] Hubei Liuguo Chemical Co., Ltd.'s annual output of 240,000 tons of 64% nutrient diammonium phosphate plant was completed and put into operation on September 18, 2012, and reached the production and standard in early 2013. In order to increase the production capacity of the device and reduce the production cost per ton, the factors restricting the production capacity of the device must be modified.

[0003] The original production process uses a single tubular reactor (referred to as tube reactor) for secondary ammoniation spray granulation. In the process of increasing production capacity, increasing the system load will lead to fouling of tube reactor nozzles, increased tube counter pressure, primary ammonia and The flow of was...

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