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Low-temperature low-pressure desulfurization wastewater evaporation treatment device and process

A desulfurization wastewater, low-temperature and low-pressure technology, applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc., can solve the problem of small flue spray treatment, large equipment footprint, flue and dust removal Corrosion of equipment and other problems to achieve the effect of improving energy utilization, avoiding equipment fouling, and reducing corrosion

Pending Publication Date: 2017-05-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used desulfurization wastewater treatment process mainly includes neutralization, flocculation, sedimentation and effluent; however, the equipment occupies a large area, high investment, complex process, and often the desulfurization wastewater after treatment is still not up to standard
However, new desulfurization wastewater technologies developed in recent years, such as membrane treatment, flue spray, MED (Multiple Effect Evaporation and Crystallization Process), etc., play a certain role in the recycling of wastewater, but there are still many problems, such as membrane treatment Severe fouling phenomenon requires frequent replacement of the filter membrane; the flue spray treatment volume is small, which is easy to corrode the flue and dust collector; the MED evaporation treatment process has problems such as easy fouling and high energy consumption

Method used

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  • Low-temperature low-pressure desulfurization wastewater evaporation treatment device and process
  • Low-temperature low-pressure desulfurization wastewater evaporation treatment device and process

Examples

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Effect test

Embodiment 1

[0032] refer to figure 1 , the low-temperature and low-pressure desulfurization wastewater evaporation treatment device described in this embodiment, the device includes a flue gas treatment system 1 and an evaporation crystallization system 2 .

[0033] The flue gas treatment system 1 includes an air preheater 11 , a dust collector 12 and a desulfurization tower 13 .

[0034] The evaporation and crystallization system 2 includes an evaporator 20, a sludge pump 21, a heater 22, a high-pressure atomizing nozzle 23, a scrubber 24, a vacuum pump 25, a condenser 26, a drainage pump 27, a slagging device 28, and a sludge Pump two 29, water storage equipment 30, feed water pump 31 and atomizing nozzle 32, wherein scrubber (such as figure 2 ) 24 includes a defogging plate 41, a sieve plate pipeline 42, a sieve plate 43, a water supply pipeline 44 and a flushing pipeline 45.

[0035] The supernatant outlet of the water storage device 30 in the evaporation crystallization system 2 i...

Embodiment 2

[0049] The low-temperature and low-pressure desulfurization wastewater evaporation device used in this embodiment is basically the same as that of the above-mentioned embodiment 1, and the differences are as follows:

[0050] The low-temperature and low-pressure desulfurization wastewater evaporation process includes the following process steps:

[0051] 1) The flue gas passes through the air preheater 11 to recover waste heat and then enters the dust collector 12 to remove dust, and the flue gas after dust removal enters the desulfurization tower 13 to generate desulfurization wastewater;

[0052] 2) Inject the desulfurization wastewater stock solution produced by the desulfurization tower 13 into the water storage device 30, and after settling, take the waste water supernatant from the water storage device 30 and inject it into the tube side of the condenser 26 through the feed pump 31, and pass through the tube side of the condenser 26 After preheating, it is injected into ...

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Abstract

The invention relates to a low-temperature low-pressure desulfurization wastewater evaporation treatment device and process. The device comprises a flue gas treatment system and an evaporation and crystallization system, wherein in the evaporation and crystallization system, flue gas form a dust collector is utilized to heat the circulating wastewater; a high-pressure atomizing nozzle and an air washer are arranged in an evaporator and are respectively used for atomizing the heated wastewater and washing steam; wastewater supernate is utilized to condense the generated steam; and the evaporated and concentrated slurry is sprayed into a flue duct after an air preheater, is evaporated and crystallized, and is removed by the dust collector. The device can be used for purifying power plant desulfurization wastewater and similar sewage. The related flash evaporation condition is a low-temperature low-pressure state, so that corrosion of wastewater for the evaporation system can be greatly reduced, the equipment is effectively prevented from scaling and slagging, the energy utilization is improved by utilizing the flue gas treatment system, salt and water separation can be achieved for a final product, and zero emission of desulfurization wastewater can be realized.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a low-temperature and low-pressure desulfurization wastewater evaporation treatment device and a process thereof. Background technique [0002] Limestone-gypsum flue gas desulfurization technology is currently the most widely used industrial flue gas desulfurization technology. The desulfurization wastewater generated by this process has the characteristics of high salt content, acidic water quality and heavy metals exceeding the standard, which has become the most difficult wastewater for power plants to treat. At present, the commonly used desulfurization wastewater treatment processes mainly include neutralization, flocculation, sedimentation and effluent; however, the equipment occupies a large area, requires high investment, and the process is complicated, so the desulfurization wastewater after treatment often still does not meet the standard. Ho...

Claims

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Application Information

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IPC IPC(8): C02F1/06C02F1/12C02F1/16C02F103/18
CPCC02F1/043C02F1/048C02F1/06C02F1/12C02F1/16C02F2001/007C02F2103/18
Inventor 赵莉李琳刘宇吴洋文董长青陆强
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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