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A crystallization cooler and its method for extending the operation period of an external circulation type crystallizer

An operation cycle and cooler technology, applied in the chemical industry, can solve problems affecting supersaturation, deterioration of heat transfer performance, crystallizer shutdown, etc., and achieve the effects of eliminating scaling, small temperature difference between inside and outside, and reducing heat exchange area

Active Publication Date: 2016-05-25
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large temperature difference between the cooled solution and the heat transfer surface of this type of cooler (the smaller the temperature difference, the better), it is very easy to crystallize scale, which not only leads to deterioration of heat transfer performance, but also affects the control of supersaturation; In severe cases, the condenser is blocked and the crystallizer is shut down

Method used

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  • A crystallization cooler and its method for extending the operation period of an external circulation type crystallizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The piperazine solution at 60°C is cooled and crystallized by a DTB crystallizer at 20°C, and the traditional tubular cooler and the crystallization cooler of the present invention are respectively used for cooling and crystallization. The traditional shell and tube cooler is directly cooled with cooling water at 6-10°C. The working fluid of the crystallization cooler of the present invention is dimethyl ether, and the temperature of the freezing water is 6-10°C. The circulating material entering the crystallization cooler is 4800kg / h piperazine solution at 23°C. The flow of chilled water is controlled through the control loop formed by the regulating valve 18 and the temperature control indicator 19, so that the evaporation temperature of the working fluid is controlled at 18°C, so that The circulating material is cooled to 20°C and enters the crystallizer.

[0026] After 112 hours of operation of the traditional shell-and-tube cooler, the cooler was blocked and unabl...

Embodiment 2

[0028] As described in Example 1, the traditional tubular cooler and the crystallization cooler of the present invention are respectively used for cooling and crystallization, and the crystallization process conditions and control mode are the same as in Example 1, except that the working fluid of the present invention is Methylal.

[0029] After the traditional shell-and-tube cooler was operated for 102 hours, the cooler was blocked and could not operate; after the crystallization cooler of the present invention was operated for 200 hours, no obvious fouling was found when the crystallization cooler was disassembled.

Embodiment 3

[0031] As described in Example 1, the traditional tubular cooler and the crystallization cooler of the present invention are respectively used for cooling and crystallization, and the crystallization process conditions and control mode are the same as in Example 1, except that the working fluid of the present invention is Methyl tert-butyl ether.

[0032] After 95 hours of operation of the traditional shell-and-tube cooler, the cooler was blocked and unable to operate; after the crystallization cooler of the present invention was operated for 200 hours, no obvious fouling was found when the crystallization cooler was disassembled.

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Abstract

The invention discloses a crystallization cooler capable of prolonging the operation period of external circulating type crystallization. The crystallization cooler mainly solves the problems of a conventional crystallization cooler that in an external circulating type cooling and crystallization process, heat transfer performance deteriorates, a pipeline is plugged to cause frequent faults and the operation period is short. Circulating materials in a crystallizer are mixed with fresh feeding materials, and the mixture is cooled in an evaporation section by evaporating working liquid to generate the degree of supersaturation, and then is crystallized in the crystallizer; the gas phase of the working liquid evaporated in the evaporation section enters a condensation section, exchanges heat with frozen water to be condensed and then flows back to the evaporation section through gravity; a control loop is formed by the working liquid gas phase and a regulating valve, the evaporation temperature of the working liquid can be controlled by controlling the flow rate of chilled water, thus controlling the difference of temperatures inside and outside a heat exchange pipe of the evaporator and further preventing scaling.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a cooler for an external circulation crystallization process, in particular to a crystallization cooler and a crystallization method for crystallization when an Olso crystallizer, a DTB crystallizer and a DP crystallizer are used for cooling crystallization. Background technique [0002] Industrial crystallization is a basic chemical process, and the manufacture of various products is related to crystallization. Such as inorganic fertilizers, inorganic salts, chemical reagents, petrochemical products and explosives. Cooling crystallization is one of the important processes of industrial crystallization. Crystals are precipitated by cooling to supersaturation, and it is suitable for systems whose solubility decreases significantly with the decrease of temperature. [0003] Partition wall heat exchange cooling crystallization is one of the most widely used cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/02
Inventor 袁俊吕剑杨建明赵锋伟王博张伟惠丰杜咏梅秦越马辉郝志军
Owner XIAN MODERN CHEM RES INST