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Method for applying petrochemical exhausted lye to semidry-method flue gas desulfurization

A petrochemical and waste lye technology, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, to achieve the effects of reducing treatment costs, occupying a small area, and improving flue gas desulfurization efficiency

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method for using petrochemical waste lye in the semi-dry desulfurization of boiler flue gas, to realize waste treatment with waste, and to improve the efficiency of flue gas desulfurization, Ensure that the exhausted flue gas is stably discharged up to the standard (the sulfur dioxide content in the exhaust gas can be completely maintained at 600mg / Nm 3 Below), save part of the desulfurizer, reduce the cost of separate treatment of waste caustic soda, save energy and reduce consumption, and can also eliminate the impact of waste caustic discharge on sewage treatment plants, effectively overcome the large area occupied by wet desulfurization and the investment in wastewater treatment Disadvantages such as high cost

Method used

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  • Method for applying petrochemical exhausted lye to semidry-method flue gas desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]The olefin waste lye is settled by gravity for 24-48 hours, and the oily substances and suspended solids are separated and removed. Spray the pretreated waste lye and desulfurizer into the absorption tower with spray nozzles in the middle and upper part of the absorption tower, and at the same time, pass the boiler flue gas that has removed most of the dust in the flue gas through electrostatic dust removal into the absorption tower At the bottom, after being accelerated by the Venturi structure at the bottom of the absorption tower, it enters the absorption tower and flows from bottom to top in the tower. In this process, the pretreated waste caustic soda is driven into the absorption tower by the corrosion-resistant pump and spray nozzle, sprayed from top to bottom from the sprayer, and directly contacts with the flue gas in a turbulent state, fully reacting to reach SO removal from flue gas 2 the goal of.

[0028] In this example, the flow rate of boiler flue gas is...

Embodiment 2

[0031] In this example, boiler flue gas SO 2 The concentration is 2100~3900mg / Nm 3 . When the injection amount of waste lye is 4.0t / h, and the desulfurization agent is sodium hydroxide, and the dosage is 1.5t / h, the SO in the flue gas 2 Emission concentration 500~600mg / Nm 3 , The desulfurization rate is 75% to 85%. The color of desulfurization gray is dark gray, and the main component is Na 2 S 2 o 3 ·5H 2 O, Na 2 SO 3 、Na 2 CO 3 ·H 2 O, the density is 0.7626Kg / dm 3 . Other method steps are with embodiment 1.

Embodiment 3

[0033] In this example, the alkali-containing waste water is the waste lye produced by the vinyl chloride plant, and most of the organic matter is removed by rectification or stripping. After pretreatment, the dichloroethane content of the alkali-containing wastewater is less than or equal to 1 μg / g.

[0034] The flow rate of boiler flue gas to the bottom of the absorption tower is 40-50Nm 3 / h,SO 2 The concentration is 2600~4300mg / Nm 3 . When the amount of waste lye injected from the middle and upper part of the absorption tower is 6.0t / h, and the amount of sodium hydroxide injected is 0.8t / h, the SO in the flue gas 2 Emission concentration 400~500mg / Nm 3 , The desulfurization rate is 80% to 90%.

[0035] The color of desulfurization gray is dark gray, and the main component is Na 2 S 2 o 3 ·5H 2 O, Na 2 SO 3 、Na 2 CO 3 ·H 2 O, the density is 0.8434Kg / dm 3 . Other method steps are with embodiment 1.

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Abstract

The invention discloses a method for applying petrochemical exhausted lye to semidry-method flue gas desulfurization, belonging to the technical field of environmental protection. The method disclosed by the invention is characterized in that part or all of exhausted lye subjected to pretreatment replaces industrial water and is applied to a semidry-method desulfurization device for boiler flue gas, and injected to a desulfurizing absorption tower according to a required amount, wherein alkaline compounds such as Na2S, NaOH and / or Na2CO3 and the like of the exhausted lye fully react with SO2 in flue gas, then generated sulfur-containing compounds as heavy components are fed into a circulatory ash system and treated along with circulatory ash, and light components are discharged to a desulfurized ash silo of a power plant; and the desulfurization rate of externally-exhausted flue gas is greatly increased and can reach 70-99%, thereby achieving an effect of stable emission on standard. Meanwhile, the application amount of a desulfurizing agent can be saved, the influence of exhausted lye on a sewage treatment system is eliminated, effects of saving energy and reducing consumption are achieved, and the treatment of wastes with processes of wastes against one another is realized, therefore, the method has good economic and social benefits.

Description

technical field [0001] The invention relates to a method for using petrochemical waste lye in semi-dry flue gas desulfurization, belonging to the technical field of environmental protection, and in particular to a method for using petrochemical waste lye in semi-dry desulfurization of boiler flue gas. Background technique [0002] Most of the thermal power plants supporting petrochemical production use pulverized coal boilers, and the flue gas generated must be desulfurized and discharged after reaching the standard. Flue gas desulfurization technology mainly uses various alkaline absorbents or adsorbents to capture SO in flue gas. 2 It is transformed into sulfur-containing compounds that are stable and easily separated mechanically. Generally speaking, flue gas desulfurization technology can be divided into dry method, semi-dry method and wet method. Among them, the semi-dry flue gas desulfurization technology is that the desulfurization absorption and product treatment a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 邱纯书孙玉忠潘咸峰张方银王建娜李茂双
Owner CHINA PETROLEUM & CHEM CORP
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