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Multi-stage steam-carrying evaporation and concentration process for high-concentration wastewater

A technology for evaporative concentration and concentrated wastewater, applied in the direction of heating water/sewage treatment, etc., can solve the problems of complex systems, complex equipment, complex components, etc., and achieve the effect of simplifying the process section and reducing equipment investment

Inactive Publication Date: 2020-03-31
江苏同奇环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through papers, patents and market research and analysis, we found that there are several problems that need to be solved urgently: 1) High-concentration wastewater, especially pharmaceutical wastewater, has complex components, it is extremely difficult to domesticate microorganisms, and biochemical treatment is difficult to implement; 2) High-concentration wastewater contains more salt. It is highly corrosive, and corrosive gas is dissolved in the steam generated during the high-temperature concentration process. If a similar seawater desalination process is used, it is difficult to overcome the corrosion problem of the container and heat exchange equipment; 3) The traditional multi-effect evaporation concentration process is suitable for Treatment of a large amount of wastewater, while processing a small amount of wastewater requires high energy consumption, complex equipment, high investment, and low cost performance. At present, there is no good industrial wastewater treatment technology with a daily processing capacity of less than 20 tons, especially for high Thick wastewater reduction technology; 4) Some patents use solar evaporation. Although this technology can effectively use new energy, solar energy is unstable and cannot work without sunlight, resulting in large fluctuations in equipment processing capacity. Additional supplementary heat source, complex system
[0005] Generally speaking, the existing traditional thermal concentration technology is not suitable for the treatment of high-concentration industrial wastewater with a small daily treatment volume. We must find a thermal concentration evaporation process with less investment, strong adaptability, and simple maintenance to achieve high concentration. Energy Saving and Environmental Protection Treatment of Concentrated Wastewater

Method used

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  • Multi-stage steam-carrying evaporation and concentration process for high-concentration wastewater
  • Multi-stage steam-carrying evaporation and concentration process for high-concentration wastewater

Examples

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specific Embodiment 1

[0039] Specific Example 1: Three-stage evaporation process flow of multi-stage steam-carrying evaporation and concentration process for high-concentration wastewater

[0040] The steam 4-1 enters the indirect heat exchanger 4, and indirectly heats the cold wastewater concentrated solution transported by the wastewater solution pump 1-4 from the primary evaporator 1-1, and then returns to the primary evaporation through the pipeline 4-3 The device 1-1 is evaporated and concentrated, and the steam 4-1 itself is cooled by the cold waste water solution into condensed water 4-2.

[0041] In the primary evaporation section, in the primary evaporator 1-1, the hot wastewater solution heated by the indirect heat exchanger 4 is in direct contact with the dehumidified air delivered by the fan 1-3, and the air is blown and circulated by the fan 1-3 Flowing, the water in the hot wastewater solution evaporates and is taken away by the air to become hot and humid air. The air passes through...

specific Embodiment 2

[0045] Specific embodiment 2: Two-stage evaporation process flow of multi-stage steam-carrying evaporation and concentration process for high-concentration wastewater

[0046] The steam 3-1 enters the indirect heat exchanger 3, and the indirect heating solution pump 1-4 transports the cold wastewater concentrate from the primary evaporator 1-1, and returns to the primary evaporator 1- through the pipeline 3-3 1 is concentrated by evaporation, and the steam 3-1 is itself cooled by the cold solution to condensed water 3-2.

[0047] In the primary evaporation section, in the primary evaporator 1-1, the hot wastewater solution heated by the indirect heat exchanger 3 is in direct contact with the dehumidified air delivered by the fan 1-3, and the air is blown by the fan 1-3. The wind circulates, and the water in the hot wastewater solution evaporates and is carried away by the air to become hot and humid air. The hot and humid air passes through the pipeline 1-1-1 to the indirect ...

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Abstract

The invention relates to a multistage steam-carrying evaporation and concentration process for high-concentration wastewater. A device used in the multistage steam-carrying evaporation and concentration process consists of a front-end heating section, a multistage evaporation and concentration section, a wastewater solution conveying section, a tail-end cooling section and auxiliary equipment. According to the device, air is used as a steam carrier for evaporation of high-concentration wastewater, heat energy temperature gradient utilization principles are adopted, secondary steam is used forheating a cold wastewater solution, and latent heat in hot moisture is recycled, so evaporation energy consumption is reduced, and high-concentration wastewater steam condensate water is recycled. Moreover, as condensed and dehumidified air is directly contacted with a hot wastewater solution for evaporation, an evaporator made of a non-metal material can be adopted, and the problems of scaling and corrosion in traditional evaporation processes are solved; and thus, system operation stability is improved, and the service life of equipment is prolonged. The process is simple in equipment, stable in operation, low in maintenance difficulty, low in energy consumption and capable of effectively utilizing a primary heat source and realizing energy-saving and environment-friendly treatment of high-concentration wastewater.

Description

technical field [0001] The invention relates to a multi-stage steam-carrying evaporation and concentration process for high-concentration wastewater, in particular to a method of using air as an evaporation water carrier to realize atmospheric-pressure evaporation and concentration of high-concentration wastewater. Through multi-stage evaporation and intermediate condensation, this technology can make full use of the latent heat of secondary steam and reduce the consumption of primary steam. It is a high-concentration wastewater evaporation and concentration treatment device, which belongs to the technical field of environmental protection and energy-saving concentration treatment of difficult-to-treat industrial wastewater (high-concentration wastewater). . Background technique [0002] With the rapid development of my country's industry and manufacturing industry, the pollution of industrial wastewater, especially high-concentration wastewater, to the environment has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04
CPCC02F1/04
Inventor 吴志根
Owner 江苏同奇环保科技有限公司