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Crystallizer and crystallization system

A crystallizer and crystallization technology, applied in the crystallizer and crystallization system, ammonia desulfurization process field, can solve the problems such as the inability to guarantee the clarity of the reflux slurry, the damage of the heater and the tube, and the small ammonium sulfate crystal particles. Complete crystallization effect, promote growth rate, and complete solid-liquid separation effect

Pending Publication Date: 2019-11-22
XIAN AEROSPACE SOURCE POWER ENG CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Most of the existing evaporative crystallizers are empty cylinders without internal components, or only a baffle is set to partially shield them, which cannot ensure the clarity of the backflow slurry, thus causing the ammonium sulfate crystal particles in the backflow slurry to affect the equipment. Corrosion is serious, especially the heater and pipeline are easily damaged, and it also brings problems of poor solid-liquid separation effect and small ammonium sulfate crystal particles, which limit the promotion of evaporation crystallization technology

Method used

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  • Crystallizer and crystallization system
  • Crystallizer and crystallization system

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Embodiment 1

[0034] Such as figure 1 As shown, the crystallizer of this embodiment includes a crystallizer body 1, and the crystallizer body 1 is provided with a crystallizer inlet 9, a clarified liquid outlet 8, a crystallization slurry outlet 10, and a steam outlet 12. In a preferred solution, clarification There are two liquid outlets 8 arranged symmetrically;

[0035] A slurry distributor 14, a clarification zone and a crystal growth zone are arranged in the crystallizer body 1 along the flow direction of the slurry; the slurry distributor 14 is connected to the crystallizer inlet 9; the structure of the slurry distributor 14 can be an annular tube, and the tube A number of injection ports are evenly distributed along the circumferential direction,

[0036] The clarified liquid outlet 8 is located in the clarification area, and the clarification area is equipped with a filter plate, such as figure 2 As shown, the diameter of the slurry through hole 19 accounts for 40% to 60% of the ...

Embodiment 2

[0045] Such as figure 1 , figure 2 As shown, the crystallization system of this embodiment further includes a heater 2 , an evaporation circulation pump 3 , an evaporation removal pump 4 and a thick slurry pump 5 on the basis of the above embodiments.

[0046] Optionally, the heater 2 is a shell-and-tube heat exchanger, and the heater 2 is connected to the thick slurry pump 5, the evaporation circulation pump 3, and the crystallizer inlet 9; the evaporation circulation pump 3 is connected to the thick slurry pump 5, the heater 2, and the clarifier Liquid outlet 8 connection;

[0047] When working, the original ammonium sulfate slurry from the thick slurry pump 5 is mixed with the clarified slurry from the evaporation circulation pump 3 and then enters the heater 2. The heater 2 is a shell-and-tube heat exchanger, and the heating heat comes from steam at about 180 ° C. After the ammonium sulfate slurry absorbs heat, the temperature rises to 105° C. to 110° C. to obtain the c...

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Abstract

The invention discloses a crystallizer and a crystallization system. The crystallizer comprises a crystallizer body, crystallization stock solution entering from an inlet of the crystallizer is distributed in the crystallizer through a slurry distributor to be evaporated instantaneously, concentrated slurry enters the crystal growth area through the slurry through holes, in the crystallization process, part of slurry in the crystal growth area passes through the filtering holes, crystal particles in the slurry are filtered out, and liquid returns to the clear liquid outlet. The disclosed crystallization system further comprises a heater, an evaporation circulating pump and an evaporation taking-out pump, and is used for heating the crystallization stock solution and outputting clear liquidand crystallization slurry. The interior of the crystallizer is partitioned into the clearing area and the crystal growth area, so that the concentration of raw slurry and the content of crystal particles in different areas can be reasonably controlled, the crystal particles are prevented from being brought to a clear liquid outlet by turbulent flow, and solid-liquid separation in the crystallizer is more thorough.

Description

technical field [0001] The invention relates to crystallization equipment for chemical production, in particular to a crystallizer and a crystallization system, and the invention is especially suitable for ammonia desulfurization process. Background technique [0002] Crystallization is a key process link in chemical production. For example: [0003] In the ammonia desulfurization production process, the by-product is ammonium sulfate, which is a fertilizer containing nitrogen and sulfur. It has high added value and broad market demand, which is also an important advantage of ammonia desulfurization. Concentrating and crystallizing the ammonium sulfate slurry produced after desulfurization is an important part of ammonia desulfurization. At present, the domestic market is mainly divided into saturated crystallization inside the tower and evaporation crystallization outside the tower. [0004] The evaporation and crystallization device outside the tower is set outside the d...

Claims

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Application Information

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IPC IPC(8): B01D9/02C01C1/242C05C3/00
CPCB01D9/0027B01D9/0059B01D9/0063C01C1/242C05C3/00
Inventor 陈艳艳吕文豪冷健夏金松向轶李雄飞
Owner XIAN AEROSPACE SOURCE POWER ENG CO LTD
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