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Low-temperature evaporation, concentration and crystallization system and method using waste heat

A low-temperature evaporation, concentration and crystallization technology, used in chemical instruments and methods, energy and wastewater treatment, water/sewage treatment, etc. Achieve the effect of improving the reuse rate, treating a wide range of objects, and avoiding the risk of scaling

Active Publication Date: 2014-12-17
KMD BEIJING ENERGY & ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, low-temperature multi-effect evaporation is one of the most energy-saving methods in distillation, but its main problems are: low single-unit processing capacity, easy fouling, high engineering cost of equipment, and low heat transfer efficiency.
However, the use of this treatment process has extremely high requirements on equipment materials, and the system needs to consume a lot of heat during operation, which has the disadvantages of high one-time investment and high operating costs. It can only be used in power plants in particularly scarce areas.
The multi-stage flash evaporation technology was developed in view of the serious fouling shortcomings in the multi-effect evaporation process. It has been widely used and developed since it came out. Great flexibility and other advantages, but it has relatively high energy consumption, heat reuse rate and other deficiencies

Method used

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  • Low-temperature evaporation, concentration and crystallization system and method using waste heat
  • Low-temperature evaporation, concentration and crystallization system and method using waste heat
  • Low-temperature evaporation, concentration and crystallization system and method using waste heat

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] 20% sodium chloride in 5m 3 The flow rate of / h enters the concentrated evaporative crystallization system of the present invention for processing, and the processing results are as shown in Table 1: wherein, a, b to k in Table 1 correspond to figure 1 Sampling points a, b to k in .

[0037] Table 1 Sodium chloride concentrated brine evaporation concentration crystallization table

[0038]

[0039] After the concentrated brine is treated by the evaporative concentration and crystallization system and method of the present invention, the energy consumption required to obtain per cubic product water is less than 30KW·h.

Embodiment 2

[0041] 20% sodium sulfate concentrated brine with 5m 3 The flow rate of / h enters the concentrated evaporative crystallization system of the present invention for processing, and the processing results are as shown in Table 1: wherein, a, b to k in Table 1 correspond to figure 1 Sampling points a, b to k in .

[0042] Table 2 Sodium sulfate concentrated brine evaporation concentration crystallization table

[0043]

[0044] After the concentrated brine is treated by the evaporative concentration and crystallization system and method of the present invention, the energy consumption required to obtain per cubic product water is less than 30KW·h.

[0045] The evaporation concentration and crystallization system of the present invention is suitable for the treatment of high-concentration concentrated brine in various industries. Since the crystallization separation or concentration separation can be completed in an environment with a low temperature (30-80°C), the final produc...

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Abstract

The invention discloses a low-temperature evaporation, concentration and crystallization system using waste heat. The low-temperature evaporation, concentration and crystallization system comprises an evaporation chamber, a heat exchanger set containing at least one heat exchanger, a cooler, a condensation chamber and a draught fan, wherein the evaporation chamber, the draught fan and the condensation chamber are connected with one another to form a closed circulation loop; a water inlet and a water outlet of the heat exchanger set are connected with a raw water opening and an evaporator respectively; a heat-exchanging medium inlet of the heat exchanger set is connected with a heat-exchanging medium outlet of the condensation chamber and a waste heat source; a heat-exchanging medium outlet of the heat exchanger set is connected with a refrigerating medium inlet of the condensation chamber by the cooler; the system further comprises a solid-liquid separator connected with a crystallized salt outlet of the evaporation chamber; and the waste heat source comprises each type of industrial waste heat, residual heat or waste gas, such as low-temperature exhausted gas, low-temperature circulating water, cinder flushing water, terrestrial heat tail water, solar hot water and the like. By adopting the system and the method disclosed by the invention, recycling and harmless treatment can be carried out on high-concentration salt-containing wastewater under a relatively low temperature so that the energy consumption is low, and the repeated utilization rate of energy is high.

Description

technical field [0001] The present invention relates to a waste water treatment system, in particular to a low-temperature evaporation concentration system that utilizes various industrial waste heat, waste heat, waste gas, etc., and can carry out resourceful and harmless treatment of high-concentration saline waste water at a relatively low temperature. A crystallization system. In addition, the present invention also relates to a low-temperature evaporation concentration crystallization method for treating high-concentration saline wastewater by using the system, which belongs to the field of environmental protection. Background technique [0002] With the development of my country's industry, the generation of high-concentration saline wastewater is becoming more and more extensive, and the amount of wastewater is also increasing year by year, which has caused many harms to the ecological environment. For high-concentration salt-containing wastewater, the industry mainly ...

Claims

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Application Information

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IPC IPC(8): C02F1/16
CPCY02W10/37
Inventor 姬小凤
Owner KMD BEIJING ENERGY & ENVIRONMENT TECH CO LTD
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