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Flue gas desulfurization and demercuration method

A mercury and flue gas removal technology, which is applied in the field of environmental pollution control, can solve the problems of cumbersome preparation of high-activity absorbents, high operating costs of activated carbon, and easy failure of additives, etc., to prolong the ionization reaction time, occupy a small area, and The effect of convenient operation and maintenance

Active Publication Date: 2013-01-23
FUJIAN LONGKING DSDN ENGINEERING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, Zhao Yi et al. disclosed a flue gas desulfurization and mercury removal purification method in the patent application number 200310103954.7. The purpose of simultaneous desulfurization and mercury removal is achieved by spraying a highly active absorbent into the circulating fluidized bed reaction tower. The highly active absorbent includes 30%~60% fly ash, 38%~80% slaked lime and 1%~2.5% additives, among which the additives are potassium permanganate, calcium hypochlorite, ammonium persulfate and peracetic acid One or more of these methods can simultaneously achieve a desulfurization efficiency of more than 90% and a mercury removal rate of more than 50%. And it is easy to fail after being placed for a long time, so it is difficult to realize industrialization
The flue gas desulfurization and mercury removal technology developed by NETL in the United States uses the combination of flue gas desulfurization (FGD) and activated carbon flue gas injection technology (ACI) for simultaneous desulfurization and mercury removal. The mercury removal rate of this method is as high as about 90%, but a large amount of activated carbon is used. High operating costs and prone to secondary pollution

Method used

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  • Flue gas desulfurization and demercuration method

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Effect test

Embodiment 1

[0042] The generator set of a power plant with a power generation capacity of 300MW provides raw flue gas, and sulfur dioxide (SO 2 ) concentration is 1500mg / Nm 3 , the concentration of heavy metal mercury (Hg) is 3×10 -3 mg / m 3 , the original flue gas temperature is 130°C; the waste water produced during the regeneration of the ion exchange resin of the power plant boiler is mixed with industrial water to obtain water containing chloride ions, and the concentration of chloride ions in the water containing chloride ions is 0.1 mg / L; Calcium and calcium hydroxide mixture as absorbent in the circulating fluidized bed dry desulfurization and mercury dedusting device with 2030000m 3 The above-mentioned raw flue gas is fed at a speed of 39t / h, and at the same time, the above-mentioned mixed water is sprayed at a speed of 39t / h for treatment. After the treatment, the purified flue gas with an outlet temperature of about 72°C is obtained.

[0043] Detect the purified flue gas, pur...

Embodiment 2

[0045] The generator set of a power plant with a power generation capacity of 300MW provides raw flue gas, and sulfur dioxide (SO 2 ) concentration is 1500mg / Nm 3 , the concentration of heavy metal mercury (Hg) is 3×10 -3 mg / m 3 , the original flue gas temperature is 130°C; the waste water produced during the regeneration of the ion exchange resin of the power plant boiler is mixed with industrial water to obtain water containing chloride ions, and the concentration of chloride ions in the water containing chloride ions is 0.2 mg / L; Calcium and calcium hydroxide mixture as absorbent in the circulating fluidized bed dry desulfurization and mercury dedusting device with 2030000m 3 The above-mentioned raw flue gas is fed at a speed of 39t / h, and at the same time, the above-mentioned mixed water is sprayed at a speed of 39t / h for treatment. After the treatment, the purified flue gas with an outlet temperature of about 72°C is obtained.

[0046] Detect the purified flue gas, pur...

Embodiment 3

[0048] The generator set of a power plant with a power generation capacity of 300MW provides raw flue gas, and sulfur dioxide (SO 2 ) concentration is 1500mg / Nm 3 , the concentration of heavy metal mercury (Hg) is 3×10 -3 mg / m 3 , the original flue gas temperature is 130°C; the waste water produced during the regeneration of the ion exchange resin of the power plant boiler is mixed with industrial water to obtain water containing chloride ions, and the concentration of chloride ions in the water containing chloride ions is 0.3 mg / L; Calcium and calcium hydroxide mixture as absorbent in the circulating fluidized bed dry desulfurization and mercury dedusting device with 2030000m 3 The above-mentioned raw flue gas is fed at a speed of 39t / h, and at the same time, the above-mentioned mixed water is sprayed at a speed of 39t / h for treatment. After the treatment, the purified flue gas with an outlet temperature of about 72°C is obtained.

[0049] Detect the purified flue gas, pur...

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Abstract

The invention provides a flue gas desulfurization and demercuration method comprising the following steps of: spraying water containing chlorine ions into a circulating fluidized bed dry-method desulfurization and demercuration dust-removing device to purify raw flue gas; taking the water containing the chlorine ions to carry out a desulfurization and demercuration reaction in the circulating fluidized bed dry-method desulfurization and demercuration dust-removing device; and leading the purified dust-containing flue gas to pass through a cloth bag filter to obtain purified flue gas. The flue gas purified by using the method disclosed by the invention has high desulfurization and demercuration efficiency. The invention further provides a flue gas desulfurization and demercuration device for the method provided by the invention. The flue gas desulfurization and demercuration device comprises a water storage tank, an atomizing device communicated with an outlet of the water storage tank, and the circulating fluidized bed dry-method desulfurization and demercuration dust-removing device communicated with an outlet of the water storage tank. Furthermore, the method has the advantages of simple process flow, low investment and operation cost and easiness for industrialization; and the device occupies a small area and is convenient to operate and maintain.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a method for flue gas desulfurization and mercury removal. Background technique [0002] Coal, as the main energy source at present, produces a large amount of sulfur dioxide (SO 2 ) and heavy metal mercury (Hg), which seriously pollute the air environment and endanger human health. Among them, the emission of mercury from coal combustion is particularly serious, accounting for more than 1 / 3 of the total emission of mercury pollutants. Therefore, it is very important to control the emission of sulfur dioxide and heavy metal mercury. [0003] Studies have shown that the mercury content in raw coal is 0.1-5.5 μg / g, and the average mercury content is 0.22 μg / g. Therefore, the methods of mercury removal from coal-fired flue gas mainly include mercury removal before combustion, mercury removal during combustion and post-combustion mercury removal. Mercury thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/50B01D53/64
Inventor 詹威全林文锋王建春王永桥
Owner FUJIAN LONGKING DSDN ENGINEERING CO LTD
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