Single-stage multi-effect evaporation and separation device

Abstract

The invention discloses a single-stage multi-effect evaporation device for overcoming defects of the prior art, and relates to a single-stage multi-effect evaporation and separation device. The single-stage multi-effect evaporation and separation device comprises evaporators, a steam compressor, a pump and a control valve, wherein the pump is communicated with a pipeline and is used for conveyingvarious types of liquid; the first evaporator and the second evaporator are arranged in the device. The single-stage multi-effect evaporation and separation device has the advantages that the defectsof the prior art are comprehensively overcome; the running cost of equipment is greatly reduced; the energy-saving and consumption-decreasing measures can be smoothly implemented.

Description

technical field [0001] The invention relates to a single-stage multi-effect evaporation separation device, in particular to a multi-effect evaporation separation device with MVR. The device of the present invention includes an evaporator and a steam compressor, a pipeline connected to a fresh steam source, a distilled condensed water output pipeline, a waste liquid input pipeline to be treated, a treated concentrated waste liquid discharge pipeline, and a delivery pipeline. Pumps for various liquids and control valves installed on pipelines. Background technique [0002] In our country, the serious shortage and shortage of water resources is an objective reality. At the same time, the reuse of water resources and pollution control are facing severe tests. Although some gratifying results have been achieved with the strengthening of national environmental governance policies and inspections, the discharge of wastewater is an embarrassing reality that has to be faced. The pub...

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Problems solved by technology

Membrane concentration is a high-efficiency purification and concentration technology. It uses the difference in the molecular weight of the active ingredient and the liquid to achieve directional separation and concentration. However, once the concentration of inorganic salts in the sewage reaches a certain level, it will not be able to form an effective osmotic pressure. , so the range of use is very narrow, and the investment cost is too high, which cannot meet the needs of the industry at present; evaporation crystallization is to evaporate sewage to form distilled water and concentrated brine, and then separate the concentrated brine from solid and liquid, whether it is using a traditional multi-effect system or using MVR evaporation system, the water quality after treatment is very good, the solid waste can be bagged centrally, and the treatment result is relatively thorough. However, the content of calcium, magnesium and silicon ions in the wastewater is very high, and it also contains a large amount of solid suspended matter such as calcium carbonate and Excessive ash will quickly foul in the evaporator, causing the equipment to fail to operate normally

[0004] The traditional MVR evaporation system has been widely used due to its advantages of simple operation, small footprint, good energy saving effect, etc., but it is an independent unit with poor process performance. A set of MVR evaporation system can only be Working under the same temperature and concentration state, since the boiling point of the evaporated waste liquid increases with the increase of concentration, the steam compressor is required to provide a large steam saturation temperature rise, and the energy consumption increases significantly

At the same time, the equipment operates in a high-temperature and high-concentration working environment, which is prone to structural phenomena, which is very difficult to clean and increases operating costs.

[0005] In the centrifuge separation stage, the traditional centrifuge is prone to clogging due to its high requirements on the concentration, temperature and particle size of the supersaturated liquid, making it difficult to achieve solid-liquid separation. If the waste liquid contains a certain amount of organic matter, the centrifugation effect is even worse

[0006] Generally, boilers are widely used in industrial production to generate steam to meet the needs of the process. The flue gas discharged after fuel combustion still has a relatively high temperature. At present, the boiler flue gas is directly discharged into the atmosphere after desulfurization treatment, and this part of heat energy is not obtained. use efficiently

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