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Method and device for recovering urea dust by utilizing ceramic particles

A technology for ceramsite and urea, which is applied in the field of recycling urea dust and equipment using ceramsite, can solve the problems of high energy consumption and operating cost, low urea recovery efficiency, large equipment volume, etc. Uniform particle size effect

Inactive Publication Date: 2010-07-21
TIANJIN TEDA ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above methods, there are generally disadvantages such as large equipment volume, complex structure, high energy consumption and operating costs, or low urea recovery efficiency. It is urgent to find another way to develop a more convenient and effective urea dust recovery method

Method used

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  • Method and device for recovering urea dust by utilizing ceramic particles
  • Method and device for recovering urea dust by utilizing ceramic particles
  • Method and device for recovering urea dust by utilizing ceramic particles

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Experimental program
Comparison scheme
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Embodiment 1

[0023] First, fresh ceramsite 2 is soaked in storage tank 4 after adding water 3, and the water is released after soaking for about 1 hour. The urea dust gas stream 1 is sent to the filtering device 5 . After the system has been running for a period of time, start the rotary valve at the bottom of the filter device, and the ceramsite in the urea-containing aqueous solution is continuously moved out of the filter device at a certain speed and enters the washing device 6 for washing. After washing, a 17% high-concentration urea solution 7 is obtained. Return the washed ceramsite to the storage tank and re-immerse in water. After 24 hours, release the water to obtain a low-concentration urea solution 9 of about 3.8%. The ceramsite product is sent back to the filter device 5 for reuse. The above filtering device 5 adopts the fluidized bed device disclosed in Patent No. 200820142243.9.

[0024] The recovery rate of the urea dust obtained by the above method is about 98%.

Embodiment 2

[0026] First, fresh ceramsite 2 is soaked in storage tank 4 after adding water 3, and after soaking for about 3 hours, the water is released, and then the soaked ceramsite is sent to the continuous filtering device 5 and completely filled, and finally the water-containing ceramsite is filled horizontally. The urea dust gas stream 1 is sent to the filter equipment. After the system has been running for a period of time, start the rotary valve at the bottom of the filter equipment, and the ceramsite in the urea-containing aqueous solution is continuously moved out of the filter equipment at a certain speed and enters the washing equipment 6 for washing. After washing, a 20% high-concentration urea solution 7 is obtained. After washing, the ceramsite is returned to the storage tank and soaked in water again. After 30 hours, the water is released to obtain a low-concentration urea solution 9 of about 4.5%, and the ceramsite product is sent back to the filter device 5 for reuse.

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Abstract

The invention discloses a method for recovering urea dust by utilizing ceramic particles, which comprises the following steps: a) mixing fresh ceramic particles and water, and soaking in a storage tank; b) feeding the soaked water-containing ceramic particles serving as a filter material into a continuous filter plant from the upper part, making the urea-containing dust pass through the filter plant along the horizontal direction, and filtering the urea dust by the water-containing ceramic particles to obtain purified gas; c) discharging the water-containing ceramic particles through a rotary valve on the bottom of the filter plant, and changing into ceramic particles containing aqueous solution of urea; and d) washing the ceramic particles containing aqueous solution of urea through a washing plant, soaking the ceramic particles in water again, and feeding the ceramic particles back to the filter plant for repeated use, wherein 15 to 20 percent urea solution is obtained after washing, and 3 to 5 percent urea solution is obtained after soaking. The invention also discloses a device for implementing the method. Compared with the conventional urea dust recovering method, the method has the advantages of simple equipment, small occupied area, low investment, low operating cost, and high urea recovery efficiency, so the method has good development prospect and promotion value.

Description

technical field [0001] The invention relates to a method for recovering urea dust by utilizing ceramsite, which is suitable for the recovery process of urea dust produced in the urea production process. The invention also relates to a device for implementing the method. Background technique [0002] With the increasing shortage of energy resources, all walks of life are striving to promote clean production, and the awareness that pollution is also waste is gradually increasing. For fertilizer production enterprises, reducing the urea dust content in the tail gas discharge of urea prilling towers is attracting more and more attention. At present, domestic urea production enterprises basically use prilling towers for granulation. Due to the imperfect production process, the urea dust and ammonia content in the exhaust gas of prilling towers seriously exceed the standard. A small number of small and medium-sized urea enterprises in China have started to control the tail gas e...

Claims

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Application Information

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IPC IPC(8): B01D46/30C05C9/00
Inventor 张曙光高建东韩檬徐朝阳刘汉桥郝永俊董柯
Owner TIANJIN TEDA ENVIRONMENTAL PROTECTION