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Triple-effect evaporation and crystallization production process and device

A technology of three-effect evaporation and production equipment, which is applied in the direction of multi-effect evaporation and solution crystallization, can solve the problems of high discharge temperature of distilled water and condensed water, high cost of environmental protection and prevention, and large consumption of cooling water, so as to reduce emissions , It is not easy to scar, and the effect of reducing the amount of heating steam

Active Publication Date: 2014-12-17
HUBEI JIXING CHEM IND GRP
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  • Abstract
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Problems solved by technology

[0002] In the existing technology, the solubility does not change much with temperature, the low solubility, and the material solution that is easy to crystallize are affected by characteristic factors such as strong heat sensitivity, low concentration, and easy crystallization that are unique to gas. DTB evaporator and other devices, the production process of such equipment has high energy consumption, large discharge of steamed water, high discharge temperature of steamed water and condensed water, serious loss of heat energy, low utilization rate of heat energy, large consumption of cooling water for processing steamed water, The high cost of environmental protection prevention and control has become a bottleneck restricting production

Method used

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  • Triple-effect evaporation and crystallization production process and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The top of the first-effect heating chamber 1 is connected to the first-effect separation chamber 4 through the feeding pipeline, and the bottom of the first-effect separation chamber 4 is connected to the first-effect axial flow pump 8 through the feeding pipe, and then connected to the bottom of the first-effect heating chamber 1; the first-effect separation The top of the chamber 4 is connected to the upper part of the second-effect heating chamber 2 through the pipeline, the top of the second-effect heating chamber 2 is connected to the second-effect separation chamber 5 through the feeding pipeline, and the bottom of the second-effect separation chamber 5 is connected to the second-effect axial flow pump 9 through the feeding pipe. After the connection, it is connected with the bottom of the second-effect heating chamber 2; the top of the second-effect separation chamber 5 is connected with the upper part of the third-effect heating chamber 3 through a line pipeline, ...

Embodiment 2

[0047] Raw material: calcium formate solution, composition: calcium formate ~14%, water and others ~86%, temperature: 30°C,

[0048] Output: steamed water volume: 1000kg / h, product: calcium formate crystal,

[0049] Raw steam: saturated steam: pressure 0. 3~0.4MPaG

[0050] Circulating water system: the upper water temperature is 32°C, the return water temperature is 38°C, and the upper water pressure is 0.4MPaG.

[0051] The specific operation is as follows:

[0052] Open the cooling water valves of the mechanical seals of each pump. The mechanical seals cannot operate without cooling liquid. Check that all valves are closed;

[0053] Check the supply pressure of the circulating cooling water, open the valve of the indirect condenser shell-side venting pipeline, and discharge the non-condensable gas on the shell side; feed the circulating cooling water, check whether the temperature, pressure, and return water temperature of the circulating cooling water are accurate ;

...

Embodiment 3

[0077] Concrete implementation steps are with embodiment 2, and other data are as follows:

[0078] Feed calcium formate 2.75m 3 / h, concentration 14%, steam flow 634 kg / h;

[0079] One effect: temperature 90℃, pressure: -40kpa;

[0080] Second effect: temperature 72°C, pressure: -67kpa;

[0081] Three effects: temperature 53°C, pressure: -86kpa;

[0082] At this time, the amount of steamed water: 1.320t / h;

[0083] The steam consumption ratio: 0.48 (t steam / t water);

[0084] From the above results, the steam consumption ratio of the three-effect evaporation system can be determined: 0.45-0.5 (t steam / t water).

[0085] Using the above process and steps, the yield can reach 88% and above.

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Abstract

The invention provides a triple-effect evaporation and crystallization production process and device with little change in solubility along the temperature, with low solubility and material crystallization simplicity. The process adopts triple-effect forced circulation evaporation; a third-effect separating chamber is in the type of a DTB (draft tube baffled) crystallizer; second-effect evaporated and concentrated materials enters the heating chamber of a third-effect evaporator through inter-effect pressure difference; hot concentrated materials enter a draft tube at the bottom of the DTB crystallizer, move up to the surface layer of liquid under the action of a forceful axial pump and flashed under the action of vacuum; crystal generated by supersaturated solution can move downwards from the surface layer of the liquid and towards the bottom along an annular channel outside the draft tube; crystal mush is exhausted from the bottom of the crystallizer outside the draft tube; after centrifugal separation is performed, large-grained and uniform-granularity products can be obtained.

Description

technical field [0001] The invention relates to a three-effect evaporation and crystallization production process for a material whose solubility does not change much with temperature, has low solubility, and is easy to crystallize, in particular an improved material evaporation crystallization process and crystallization equipment suitable for a DTB crystallizer. Background technique [0002] In the existing technology, the solubility does not change much with temperature, the low solubility, and the material solution that is easy to crystallize are affected by characteristic factors such as strong heat sensitivity, low concentration, and easy crystallization that are unique to gas. DTB evaporator and other devices, the production process of such equipment has high energy consumption, large discharge of steamed water, high discharge temperature of steamed water and condensed water, serious loss of heat energy, low utilization rate of heat energy, large consumption of cooling...

Claims

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Application Information

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IPC IPC(8): B01D9/02B01D1/26
Inventor 张志祥吴杰袁翔
Owner HUBEI JIXING CHEM IND GRP
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