Method and equipment for evaporation crystallization of high concentration salt water

Abstract

The present invention relates to a method and equipment for evaporation crystallization of high concentration salt water, wherein waste heat of a low temperature material is collected by using a low temperature heat recovery apparatus to prepare low temperature hot water with a temperature of less than 95 DEG C, the low temperature hot water is used to heat concentrated salt water and air, the heated and pressurized concentrated salt water and the heated and pressurized air enter the evaporator of an evaporation crystallization apparatus, the high concentration salt water is atomized into the micro particle size liquid droplets through an atomization spraying nozzle, the micro particle size liquid droplets and the hot air are mixed, the micro particle size liquid droplets are evaporated so as to form salt micro-particles, the salt micro-particles are separated through a dust removing device, and are discharged and collected through a rotary valve, and the filtered clean air is discharged into the atmosphere through an exhaust fan. The method and the equipment of the present invention have the following advantages that: the occupation area of the present invention is much smaller than the occupation area of the evaporation pond, the environmental pollution risk is low; the equipment operates at a room temperature under a normal pressure, such that the risk during the operating process is substantially reduced; the equipment can adopt the non-metallic corrosion-resistant material, such that the operating time is long, and the maintenance cost is low; the construction cost is low, and the maintenance is easy; and the enterprise waste heat is utilized as the evaporation heat source, such that the whole energy consumption is low.

Description

technical field [0001] The invention relates to a zero-discharge method at the end of sewage treatment, in particular to a method and equipment for evaporation and crystallization of high-concentration brine. Background technique [0002] The national environmental protection requirements for sewage discharge, especially for large-scale integrated petroleum and chemical enterprises, are becoming more and more stringent, and the requirements for zero discharge of sewage are becoming more and more common. For the zero discharge of sewage in large-scale integrated petroleum and chemical enterprises, the method of evaporation and crystallization is mainly used. Evaporation crystallization currently mainly includes several methods such as evaporation pond, multi-effect evaporation, and falling film mechanical compression evaporation crystallization. The evaporation pond occupies a large area and is greatly restricted by natural conditions. There is a risk of groundwater pollutio...

AI Technical Summary

Problems solved by technology

The evaporation pond occupies a large area and is greatly restricted by natural conditions. There is a risk of groundwater pollution caused by the leakage of the evaporation pond. Currently, it is restricted by national environmental protection regulations, and its use is greatly restricted.

Multi-effect evaporation requires high-grade steam as a heat source. It belongs to a pressure system. It needs to consider the use of corrosion-resistant metals. The system is more complicated and the cost is higher.

The method of falling film mechanical compression evaporation crystallization requires almost no additional heat and requires a certain amount of power consumption. It belongs to the pressure system and needs to consider the use of corrosion-resistant metals. The system is complicated and the cost is high.

[0003] In the production process of large-scale joint enterprises such as oil refining, petrochemical, and coal chemical industry, during the cooling process of high-temperature process materials, although heat recovery has been carried out, there are still a large number of low-temperature materials that need to be continuously cooled by air coolers and circulating water systems. Waste heat is not fully utilized

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