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A plate type multi-stage flash desulfurization wastewater treatment and recovery device and its method

A technology of desulfurization waste water and recovery device, applied in water/sewage multi-stage treatment, water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as evaporator corrosion and scaling, improve heat transfer coefficient and prolong time , to avoid the effect of corrosion and scaling

Active Publication Date: 2016-01-27
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main factor restricting the development of thermal evaporation desulfurization wastewater treatment technology is the serious corrosion and scaling in the evaporator. Therefore, it is necessary to develop a new type of desulfurization wastewater treatment method to solve the problem of corrosion and scaling in the evaporator.

Method used

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  • A plate type multi-stage flash desulfurization wastewater treatment and recovery device and its method
  • A plate type multi-stage flash desulfurization wastewater treatment and recovery device and its method
  • A plate type multi-stage flash desulfurization wastewater treatment and recovery device and its method

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Embodiment Construction

[0026] Such as figure 1 , 2 , 3, 4, and 5, the plate-type multi-stage flash desulfurization wastewater treatment device includes a first-stage plate heat exchanger 1, a first-stage booster pump 2, a second-stage plate heat exchanger 3, and a second-stage booster pump Pump 4, first stage fresh water tank 5, n-1th stage plate heat exchanger 6, n-1st stage booster pump 7, second stage fresh water tank 8, nth stage plate heat exchanger 9, nth stage Booster pump 10, n-1st stage fresh water tank 11, plate condenser 12, desulfurization wastewater pretreatment pool 13, booster pump 14, nth stage fresh water tank 15, fresh water pump 16, fresh water pool 17, circulating water pump 18, Concentrate treatment tank 19, nth stage delivery pump 20, three-way valve 21, nth stage flash tank 22, n-1st stage delivery pump 23, n-1st stage flash tank 24, second stage delivery pump 25. The second-stage flash tank 26, the first-stage delivery pump 27, the first-stage flash tank 28, and the boiler ...

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Abstract

Provided are a plate-type multi-stage flash distillation apparatus for desulfurization wastewater treatment and recovery and a method therefor. The apparatus is mainly composed of plate-type heat exchangers, a plate-type condenser (12), a boiler (29), flash distillation tanks, freshwater tanks, water pumps and stainless steel pipelines. A pretreated desulfurization wastewater is brought into the plate-type heat exchanger stage by stage, heated to a certain temperature, and then brought into a first stage flash distillation tank (5) for flash distillation, the secondary steam is brought into the next-stage plate-type heat exchangers and condensed to release the latent heat to preheat the desulfurization wastewater, the concentrated desulfurization wastewater is brought into the next-stage flash distillation tank for flash distillation, and the process is carried out in sequence to the final stage, in which the secondary steam is brought into the plate-type condenser (12), the condensed fresh water in each stage is brought into a freshwater pool (17) for recycling, a part of the concentrated desulfurization wastewater is used as a circulating liquid to maintain the continuous proceeding of the flash distillation process, and a part thereof is brought into a concentrated liquid treating pool (19) and subjected to a centralized treatment. The apparatus and method can recover the latent heat of the secondary steam, has a high concentration multiple, a small occupation area and a low energy consumption, and can achieve zero release of the desulfurization wastewater.

Description

technical field [0001] The invention relates to a plate-type multi-stage flash desulfurization wastewater treatment and recovery device and a method thereof, belonging to the technical field of desulfurization wastewater treatment. Background technique [0002] SO emissions from coal-fired power plants 2 It will cause serious air pollution, and a desulfurization system must be installed to treat SO 2 Remove. There are many desulfurization technologies in thermal power plants, which can be divided into pre-combustion desulfurization, in-combustion desulfurization and post-combustion desulfurization according to the position of the process in the combustion process. Due to economic factors and unit capacity constraints, the first two desulfurization technologies have not been widely used. Flue gas desulfurization (FGD) is currently the only desulfurization technology in large-scale commercial operation. Among all flue gas desulfurization technologies, limestone-gypsum flue ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/06
CPCC02F1/06C02F2201/002
Inventor 肖刚李明春骆仲泱倪明江高翔岑可法方梦祥周劲松施正伦程乐鸣王勤辉王树荣余春江王涛郑成航
Owner ZHEJIANG UNIV
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