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Application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production technology

A technology of heat pump evaporation and vacuum salt production, which is applied in the field of salt production, can solve the problems of large investment in new construction and waste of assets, and achieve the effects of short investment recovery period, energy saving and energy consumption reduction

Active Publication Date: 2021-11-02
SHANDONG CAIYANGZI SALTWORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] How to apply the MVR heat pump evaporation salt production technology to the existing vacuum salt production evaporation equipment, there are two methods, one is new construction, the other is technical transformation, the investment in new construction is large, and the existing equipment will be idle, resulting in waste of assets

Method used

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  • Application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production technology
  • Application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production technology
  • Application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production technology

Examples

Experimental program
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Effect test

Embodiment 1

[0051] like figure 2 As shown, the evaporation and crystallization process of MVR heat pump evaporation salt production in the multi-effect vacuum salt production process technology, the specific steps include:

[0052] 1. After the salt washing process, the sea salt from the salt pond is sent to the salt washing yard for temporary storage; the temporarily stored solid salt enters the raw salt hopper into the disc feeder and is quantitatively fed to the raw salt belt; it is transported by the raw salt belt Go to the salt tank, mix with the condensed water from the evaporator, dissolve, make refined brine, and enter the evaporative drying system.

[0053] 2. The refined brine temporarily stored in the brine pool is pumped to the filter for filtration through the original brine, and the filtered brine enters the mixing tank to become brine; the brine in the mixing tank is pumped to the secondary preliminary After heat exchange between the heater and condensed water, refined br...

Embodiment 2

[0070] like figure 1 As shown, the brine treatment process of MVR heat pump evaporation salt production in the multi-effect vacuum salt production process technology, the specific steps include:

[0071] 1. Input the brine with a NaCl content of 310 g / L obtained after dissolving the original salt into the reaction tank, add soda ash to adjust the pH value to 8, and then input it into the settling tank to settle to obtain the upper refined brine;

[0072] 2. Transport the upper layer of refined brine to the refined brine tank, and pump it to the preheater through the mixing pump. After the refined brine is preheated to 98-101°C, it enters the circulation pipe, is forced to circulate, and then enters the five-effect evaporation system;

[0073] 3. In the five-effect evaporation system, the steam pressure at the outlet of the compressor is controlled at 169.1kpa, and the pressure of the evaporation chamber is controlled at -0.001Mpa. After the evaporation tank is concentrated and...

Embodiment 3

[0077] like image 3 As shown, the steam treatment process of MVR heat pump evaporation salt production in the multi-effect vacuum salt production process technology, the specific steps include:

[0078] 1. There are two raw steam from the border area. The first raw steam enters the MVR evaporation device as a supplementary heat source for system start-up and normal operation of the system; the second raw steam enters the air preheater for preheating Air, as the heat source for the drying system;

[0079] The volume ratio of the first branch raw steam to the second branch raw steam is 1:1.

[0080] 2. The secondary steam evaporated from each effect goes through the demister to remove the entrained mist, and then enters the scrubber together. After being washed by the circulating condensed water in the scrubber, it enters the steam compressor and passes through the compressor. compression;

[0081] The inlet medium of the steam compressor is saturated water vapor, the inlet ...

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Abstract

The invention relates to an application method of MVR (mechanical vapor recompression) heat pump evaporation salt production in a multi-effect vacuum salt production process technology. The application method comprises an evaporation crystallization process, a brine treatment process, a steam treatment process, a condensate water treatment process and a non-condensable gas treatment process. In the steam treatment process, live steam is introduced into an MVR evaporation device and an air preheater; after entrainment carried by secondary steam evaporated by each effect is removed through a demister, the secondary steam is gathered to enter a scrubber tower, is washed by circulating condensate water in the scrubber tower and then enters a steam compressor to be compressed; and secondary steam is compressed in the compressor and then enters each effect heating chamber to serve as a heat source. According to the application method disclosed by the invention, 40.5% of energy consumption can be reduced; the project construction period is only eight months; few plants, small occupied area and low equipment and facility investment are provided; and the payback period is only 3.34 years.

Description

technical field [0001] The invention relates to the technical field of salt production, in particular to an application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production technology. Background technique [0002] MVR is the abbreviation of mechanical vapor recompression technology (mechanical vapor recompression), which uses the secondary steam and its energy generated by the evaporation system itself to upgrade the low-grade steam into a high-grade steam heat source through the mechanical work of the compressor. Such a cycle provides heat energy to the evaporation system, thereby reducing the demand for external energy as an energy-saving technology. [0003] The original multi-effect vacuum salt production generally uses power plant boilers to burn coal to generate steam, which is used to generate electricity, and the steam after power generation is then used for vacuum salt production. Emissions put forward higher requirements, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/00B01D1/30B01D9/02B01D1/26B01D3/06F25B30/06
CPCB01D1/0011B01D1/26B01D1/30B01D9/0031B01D3/06B01D1/0082F25B30/06
Inventor 杨伟杨彩霞王志册单宝成张元刚
Owner SHANDONG CAIYANGZI SALTWORKS
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