System and method for preparing sulphur-bearing granular urea

A technology of large-grain urea and urea, applied in the direction of fertilizer mixture, fertilizer form, fertilization device, etc., can solve the problems of plant loss, single urea nutrient, low nitrogen utilization rate, etc., and achieve the effect of short process, simple operation and low investment

Inactive Publication Date: 2010-07-14
北京荷丰远东技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the single nutrient of urea, it cannot provide other nutrients needed by plants
At the same time, because the nitrogen content is too high, plants often have no time to absorb it and cause loss, which not only causes the nitrogen utilization rate to be too low, but also causes serious environmental pollution.

Method used

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  • System and method for preparing sulphur-bearing granular urea
  • System and method for preparing sulphur-bearing granular urea
  • System and method for preparing sulphur-bearing granular urea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In the original large granular urea production process (see figure 1 ) on the basis of adding sulfur part, dispersant to add pump, and evaporator to form the system for preparing sulfur-containing large-grained urea according to the present invention.

[0058] The vulcanizing part includes a stirring tank 11 (including an outlet regulating valve), a vulcanizing pump 13, and the dispersant adding pump is a metering pump 12. The added equipment is shown in Table 1:

[0059] Table 1 The newly added equipment of the system of the present invention

[0060] device name

quantity

Remark

sulfur stirred tank

1

Atmospheric operating conditions

Sulfurizing pump (suitable for suspended material liquid)

1+1 (one of

Standby)

The pressure head (that is, the head of the pump) is higher than

Urea feed pump

Metering pumps

1

Dispersant dosage control

Evaporator

1

Simple flow control loop ...

Embodiment 2

[0074] The system for preparing sulfur-containing large granular urea described in Example 1 was used to prepare sulfur-containing large granular urea with a sulfur content of 10%.

[0075] The sulfur powder is melted in the stirring tank 11 (temperature 135° C.), and the outlet regulator of the stirring tank 11 is used to control the added mass to be 10% of the total mass, and the sulfur adding pump 13 is added to the pipeline for transporting the urea melt to be granulated Middle: adopt commercially available liquid dispersant and control its adding mass to be 0.1% of the total mass by metering pump 12, add in the pipeline that transports the urea melt to be granulated. Then the urea melt to be granulated mixed with sulfur melt and dispersant enters the fluidized bed granulator 2 for granulation, and the obtained urea granules pass through the bucket elevator 3 and enter the sieving machine 4 to be sieved (2-4 mm), and the particle size is qualified The large particle urea i...

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Abstract

The invention relates to a system and a method for preparing sulphur-bearing granular urea. The invention utilizes the existing device for preparing sulphur-bearing granular urea, adds a sulphur adding part, a dispersing agent adding pump and an evaporator, provides a system for preparing the sulphur-bearing granular urea, and provides the method for producing the sulphur-bearing granular urea by using the system. The system of the invention possibly maintains the original system for preparing the sulphur-bearing granular urea, has the advantages of simple operation, low investment and short flow process, and can conveniently provide the sulphur-bearing urea capable of meeting the sulphur nutrient requirement of crops.

Description

technical field [0001] The invention relates to the field of chemical fertilizer production, in particular to a system and method for preparing sulfur-containing large granular urea. Background technique [0002] Currently, by NH 3 and CO 2 Synthetically prepared solid urea is one of the most important types of nitrogen fertilizer, which is widely used in agricultural production as fertilizer. However, due to the single nutrient of urea, it cannot provide other nutrients needed by plants. At the same time, because the nitrogen content is too high, plants often have no time to absorb it and cause loss, which not only causes the nitrogen fertilizer utilization rate to be too low, but also causes serious environmental pollution. In fact, sulfur deficiency is common in many areas, especially in sandy, low-organic soils, which usually need to be supplemented with sulfur-containing fertilizers. Therefore, sulfur-coated urea, in which sulfur is coated on the outside of urea gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00
Inventor 王威高彦芳
Owner 北京荷丰远东技术有限公司
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