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Urea melting apparatus

A melting device, urea technology, applied in the direction of fertilization device, urea compound fertilizer, nitrogen fertilizer, etc., can solve the problems of low stirring intensity, high maintenance cost, ammonia bubbling, etc., to speed up the melting speed, prevent the risk of leaking tanks, The effect of preventing local high temperature

Inactive Publication Date: 2012-05-23
JIANGSU ABOLUO COMPOUND FERTILIZER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The stirring strength of the stirring paddle in the urea melting tank is small, and it is difficult to form an up and down circulation flow. The solid urea is easily suspended on the surface of the urine, and it is not heated uniformly, so it cannot be melted quickly. It can only be melted when water (3-5%) is added.
Since the urea solution has a relatively long residence time (≥20min) or contains 3-5% moisture in the melting tank, the urea in the urea solution will soon be at high temperature (>100°C) and a long residence time (≥20min) Under certain conditions, a large amount of biuret is rapidly formed; at the same time, urea is rapidly hydrolyzed under the action of water [CO(NH 2 ) 2 +H 2 O=CO 2 +2NH 3 ], overflowing a large amount of ammonia, resulting in the loss of nitrogen on the one hand, on the other hand the hydrolysis causes the vapor pressure of ammonia in the urine to drop, leading to the further generation of biuret in the urine; in addition, adding water to the urine will cause the moisture content of the finished product High, the particles are flat and not round
[0005] 2. The stirring intensity of this type of device is low, the fluidity of the urine in the melting tank is poor, the heat of the heating coil cannot fully exchange heat with the urine in the tank, resulting in the enrichment of heat near the coil, the temperature rises, and the urine occurs Condensation reaction produces biuret (according to the measurement, the content of biuret in the urine prepared by the urea melter with the above structure is usually 5-8 times that of the solid urea itself), and a large amount of ammonia Gas overflow produces bubbling phenomenon, which causes nutrient loss, pollutes the environment, and easily leads to bubbling
[0006] 3. The molten urine is poured into the granulator through the submerged pump in the auxiliary tank. The steam insulation pipe cannot be installed at the pump outlet, and the urine is easy to solidify and block here; most of the valves in the urine pipeline are insulation valves. High maintenance costs
[0007] 4. The vertical submerged pump cannot completely drain the urine in the melting tank, and it is difficult to drain the urine and clean the tank, and it is easy to cause waste
[0008] 5. This type of equipment has a large investment and high maintenance and operation costs. If it is necessary to be equipped with a computer metering system to control the flow of urine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 A urea melting device, see figure 2 , Including an ellipsoidal crown bottom melting tank (Φ1800mm, H2200mm), a stirring mechanism, a heating coil 3 set in the melting tank, the stirring mechanism includes a stirring motor 15 (11-15KW, depending on the size of the tank, the speed of the stirring blade It is 85 rpm), the stirring shaft 7 and the upper and lower stirring paddles 16, 18 located in the melting tank, the upper stirring paddle 16 is composed of three inclined blades (inclination angle 30°, width 120mm), The lower stirring paddle 18 is composed of three impeller-type paddles; a drain port 19 is provided at the bottom of the arc bottom surface, and the drain port 19 is connected to the spray pipe 23 by the drain pipe 21; An overflow port 29 connected to the spray pipe 23 is provided at 500mm (filters can be installed at the overflow port). The height difference between the overflow port 29 and the spray outlet of the spray pipe 23 is at least 4m to ensu...

Embodiment 2

[0033] Example 2 A urea melting device, see image 3 , Including a conical arc-shaped bottom melting tank, a stirring mechanism, and a heating coil 3 arranged in the melting tank. The stirring mechanism includes a drive motor 15, a stirring shaft 7 located in the melting tank, and three upper, middle and lower stirring paddles 16, 30, 18, the upper and middle agitating paddles 16, 30 are both composed of three inclined blades, and the lower agitating paddle 18 is composed of three impeller-type paddles; a drain port 19 is provided at the bottom of the cone bottom. The discharge port 19 is connected to the spray pipe 23 by the discharge pipe 21; an overflow port 29 connected to the spray pipe 23 is provided on the upper part of the side wall of the melting tank, and the height difference between the overflow port 29 and the spray outlet of the spray pipe 23 It is subject to ensuring that there is sufficient pressure at the nozzle; a vertical guide tube 17 is provided in the lowe...

Embodiment 3

[0034] Example 3 is a urea melting device, which is basically the same as Example 1, except that: the upper layer is inclined liquid stirring paddle, the lower layer is the A310 axial flow stirring paddle (Laining); the deflector is a straight tube type .

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Abstract

The invention relates to a solid urea melting device, aiming at solving the technical problems of low melting efficiency, easy generation of biuret, difficult clearing and maintaining, as well as high operating cost in the existing similar devices. The device comprises a melting tank, a stirring mechanism and a heating coil arranged in the melting tank, wherein, a stirring shaft and stirring paddles of the stirring mechanism are arranged in the melting tank; the device is characterized in that: the bottom surface of the melting tank is a curved surface, and a purging port is arranged at the bottom of the curved surface; an overflow port communicated with a guniting pipe is arranged at the upper part of the side wall of the melting tank; at least two upper and lower layers of stirring paddles are laid out on the stirring shaft; and a guide flow cylinder is arranged at the lower area of the inside of the heating coil, and the lower layer of stirring paddles is matched with and arranged in the guide flow cylinder. The device can be widely applied in the field of compound fertilizer production for the fast melting of solid urea.

Description

Technical field [0001] The invention relates to a compound fertilizer production equipment, in particular to a solid urea melting device. technical background [0002] With the development and production needs of urine slurry urea-based compound fertilizer technology, sulfur-based compound fertilizer spraying nitrogen supplement technology, and large particle urea technology, high-concentration urine (≥99.5%) is used in the above-mentioned various technology Plays an increasingly important role. Except for the urea factory that can directly provide high-concentration urine (≥99.5%), other high-concentration urine is mainly derived from the direct melting of solid granular urea, but due to the particularity of urea itself, solid urea will be hydrolyzed during melting And isomerization condensation, and biuret formation. The compound fertilizer or large granular urea processed from the urine with higher biuret is not good for the growth of crops, especially it will cause serious ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05C9/00
Inventor 赖涛
Owner JIANGSU ABOLUO COMPOUND FERTILIZER
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