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Device for treating wastewater by using low-grade flue gas

A flue gas treatment, low-grade technology, applied in the direction of gaseous effluent wastewater treatment, filtration treatment, sedimentation treatment, etc., can solve the problems of adverse effects on unit efficiency, high-quality heat energy consumption, high investment cost, etc., and achieve good social and economic benefits impact, low operating costs, and low investment

Pending Publication Date: 2019-10-25
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is that the existing desulfurization wastewater concentration technology has defects such as high-quality heat energy consumption, high energy consumption, high investment cost, high operation requirements, and adverse effects on unit efficiency. Device for treating waste water with low-grade flue gas

Method used

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  • Device for treating wastewater by using low-grade flue gas
  • Device for treating wastewater by using low-grade flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a device for treating waste water using low-grade flue gas, such as figure 1 and 2 As shown, it includes a dedusting unit 1 and a desulfurization unit 2 connected in communication, and also includes an economizer 4, which is arranged between the dedusting unit 1 and the desulfurization unit 2 or along the flow direction of the flue gas, and is arranged upstream of the dedusting unit 1. In the embodiment, the dedusting unit 1 is an electric dust collector, the economizer 4 is a low-temperature economizer, and the desulfurization unit 2 is a desulfurization tower, which also includes,

[0035] The first heat exchanger 5 communicates with the economizer 4 to exchange heat between the desulfurization waste water and the first heat exchange medium from the economizer in the first heat exchanger 5, specifically, the first heat exchange medium is Intermediate heat medium water obtained after heat exchange of high-temperature flue gas;

[0036] The fl...

Embodiment 2

[0042] This embodiment provides a device for treating waste water using low-grade flue gas, such as figure 1 and 2 As shown, on the basis of the above-mentioned embodiment 1, in order to improve the heat utilization efficiency and the desulfurization wastewater treatment effect, a second heat exchanger 9 is also included, which is arranged between the flash tank 6 and the precipitation unit 8-1. The inlet end of the heat exchanger 9 is connected to the outlet of the concentrated waste water, and the outlet end is connected to the straight line section, so that the concentrated waste water can exchange heat with the second heat exchange medium in the second heat exchanger 9. Specifically, the second heat exchange medium is from the outside The low addition of condensate;

[0043] Such as figure 1 As shown, it also includes a third heat exchanger 7, communicated with the secondary steam outlet on the upper part of the shell, and the third heat exchanger 7 is also communicated ...

Embodiment 3

[0045] This embodiment provides a device for treating waste water using low-grade flue gas. On the basis of the above-mentioned embodiment 1 or 2, it also includes a first pump 11, which communicates with the flash tank 6 and is used to make the flash tank 6 It is in a negative pressure state and controls its internal vacuum; that is, in order to ensure that the heated wastewater can be flashed and concentrated, the low temperature phase change concentration system needs to be equipped with a vacuum pump (that is, the first pump 11), the vacuum pump and the wastewater flash tank and condensation After the condenser is connected in series, the secondary steam is first cooled in the condenser to form secondary steam condensate, and a phase change occurs during the cooling process to generate negative pressure, which can maintain the negative pressure state of the system by itself, but the system starts and maintains vacuum Stability requires a vacuum pump to be installed. The vac...

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Abstract

The invention discloses a device for treating wastewater by using low-grade flue gas. The device is provided with a dust removal unit, an economizer and a desulfurization unit which communicate sequentially, and further comprises a first heat exchanger, a flash tank and a filter pressing device, and waste heat of the flue gas is recovered by the first heat exchanger to improve the dust removal capacity of the dust removal unit and reduce the process water replenishment of the desulfurization unit. Meanwhile, the heat recovered by the flue gas is used for increasing the temperature of the desulfurization wastewater, and the wastewater after the temperature rise is flashed in the flash tank, so that concentration of the desulfurization wastewater is realized; and the flash tank is in a negative pressure state, the recovered heat of the flue gas is taken out by the concentrated wastewater and secondary steam, the heat contained in the concentrated wastewater and the condensed secondary steam is recovered by using low pressure heater condensed water, and finally the heat is returned to a low pressure heater condensed water system to realize thermal energy cascading utilization. Meanwhile, the filter pressing device effectively treats the desulfurization wastewater. The device has low energy consumption, low investment and low operating cost, achieves efficient environmental protection effects such as energy saving and emission reduction, and has good social and economic impacts.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a device for treating waste water by using low-grade flue gas, in particular to a device used for waste heat recovery of flue gas in thermal power plants for collaborative desulfurization waste water treatment or deep recovery of waste heat for flue gas in other fields and cooperative waste water treatment installation. Background technique [0002] At present, wet desulfurization wastewater treatment mainly adopts triple box pretreatment + clarification tank + dehydrator technology, which can remove some heavy metals, reduce some SS and turbidity, but cannot remove chloride ions, and the treated wastewater has no way out. The technologies currently being studied include advanced pretreatment + concentration reduction + evaporative drying. [0003] Among them, advanced pretreatment includes dosing, clarification and filtration; concentration reduction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/18
CPCC02F9/00C02F1/001C02F2001/007C02F1/16C02F1/06C02F1/046C02F2103/18
Inventor 王争荣沈明忠汪洋夏怀鹏胡小夫耿宣苏军划沈建永李伟王桦
Owner CHINA HUADIAN ENG
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