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Method and system for flue gas demercuration by using desulfurization waste water of coal-fired power plant

A technology for desulfurizing wastewater and coal-fired power plants, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems such as the inability to reuse wastewater, negative system operation, and complicated configuration, so as to overcome high operating costs, The effect of saving operation cost and low cost

Active Publication Date: 2014-01-22
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the process of wet desulfurization of coal-fired flue gas, Cl - Ions can be heavily enriched, negatively affecting system operation
Conventional desulfurization wastewater treatment systems are complex in configuration and can only remove heavy metals and other suspended impurities in wastewater. Currently, there is no effective removal of Cl in wastewater. - Ionic chemical agents, but unable to remove Cl in wastewater - ions, so the treated wastewater still cannot be reused

Method used

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  • Method and system for flue gas demercuration by using desulfurization waste water of coal-fired power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 The shown system for flue gas demercury removal using desulfurization wastewater from coal-fired power plants includes air preheater 2, dust collector 3, absorption tower 4, dehydration device 6, desulfurization wastewater storage tank 7, water pump 8, air compressor 9 and Spraying device, wherein the air preheater 2, the dust collector 3 and the absorption tower 4 are connected sequentially through the flue, the flue gas inlet of the air preheater 2 is connected to the boiler 1, and the flue gas outlet of the absorption tower 4 is connected to the chimney 5. The water inlet of the dehydration device 6 is connected to the water outlet of the absorption tower 4 , and its water outlet is connected to the water inlet of the desulfurization wastewater storage tank 7 . A branch pipe communicating with the bottom of the absorption tower 4 is provided on the pipeline between the dehydration device 6 and the desulfurization wastewater storage tank 7 for returni...

Embodiment 2

[0028] Limestone-gypsum wet process by-products are produced by the dehydration device 6 and desulfurized wastewater without conventional neutralization, coagulation, flocculation, concentration and other conventional wastewater treatment is directly transported to the desulfurization wastewater storage tank 7, where halogen additives are added and mixed Uniformly form a desulfurization wastewater mixture, transport it to the flue before the entrance of the air preheater 2 and dust collector 3 through the water pump 8 through the wastewater pipeline, and then spray the desulfurization wastewater mixture evenly into the flue through the liquid atomizing nozzle 10, and mix with the flue gas In the desulfurization wastewater mixture, the mass ratio of the total mass of bromine and iodine elements in the halogen additive to the chlorine element in the desulfurization wastewater is 0.05, and the injection amount is 0.003L / m 3 smoke. After testing, the Hg content at the outlet of th...

Embodiment 3

[0031] Limestone-gypsum wet process by-products are produced by the dehydration device 6 and desulfurized wastewater without conventional neutralization, coagulation, flocculation, concentration and other conventional wastewater treatment is directly transported to the desulfurization wastewater storage tank 7, where mercury removal catalyst is added and Mix evenly to form a mixture of desulfurization wastewater, and use the water pump 8 to transport it to the flue before the entrance of the air preheater 2 and dust collector 3 through the wastewater pipeline, and then spray the desulfurization wastewater mixture evenly into the flue through the liquid atomizing nozzle 10, and mix with the flue gas In the desulfurization wastewater mixture, the mass ratio of the total mass of iron ions and manganese ions in the mercury removal catalyst to the chlorine element in the desulfurization wastewater is 0.01, and the injection volume is 0.004L / m 3 smoke. After testing, the Hg content ...

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Abstract

The invention discloses a method for flue gas demercuration by using desulfurization waste water of a coal-fired power plant. The method comprises the following steps: adding one or two of a halogen additive and a demercuration catalyst into desulfurization waste water produced in a wet flue gas desulphurization process of limestone-gypsum in the coal-fired power plant; after fully mixing, pumping to a flue between an air pre-heater and a dedustor; atomizing and spraying in the flue through an atomizing device; fully contacting with dust in the passing flue to remove mercury in the flue gas; capturing and removing solid state matters and flue gas dust in the desulfurization waste water, thus realizing zero-emission of the desulfurization waste water while carrying out flue gas demercuration. Meanwhile, the invention further discloses a system which uses the method. According to the invention, not only can flue gas and mercury emission of the coal-fired power plant be reduced, but also zero-emission of the desulfurization waste water is realized. Fuzzy conventional wastewater treatment processes are canceled, thereby realizing the effect of treatment of wastes with processes of wastes against one another.

Description

technical field [0001] The invention relates to a method for removing mercury from flue gas of a coal-fired power plant, in particular to a method for removing mercury from flue gas by using desulfurization wastewater from a coal-fired power plant. Meanwhile, the present invention also relates to the system of the above method. Background technique [0002] Mercury is one of the trace elements in coal, which is released into the atmosphere as the coal is burned. Due to the strong physiological toxicity and bioaccumulation of mercury pollutants, its pollution control has received widespread attention. As a country with coal as the main energy structure, my country is urgent to study the control of mercury emissions from coal-fired power plants. [0003] At present, the relatively mature flue gas mercury removal technology is activated carbon injection technology, which has considerable removal efficiency, but the cost investment is too high, and it will also affect the comp...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/86B01D53/64
Inventor 唐念盘思伟陈思维李丽胡将军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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