Double wet method flue gas desulphurization and dust removal treatment process

A wet flue gas desulfurization, desulfurization and dust removal technology, applied in gas treatment, separation methods, air quality improvement and other directions, can solve the problems of fog removal dead angle, regional structure blockage, low investment, etc., to reduce the moisture content of flue gas, reduce The final product, the effect of ultra-low emission

Active Publication Date: 2017-02-22
张明鑫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] The initial investment of the roof-type demister is lower than that of the wet ESP, but because the flushing cannot cover the whole area, there is a dead angle for demisting, which leads to blockage of the structure in some areas
Most of the systems that have been corrected are not stable enough and often exceed the standard

Method used

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  • Double wet method flue gas desulphurization and dust removal treatment process
  • Double wet method flue gas desulphurization and dust removal treatment process
  • Double wet method flue gas desulphurization and dust removal treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Double-wet flue gas desulfurization and dust removal process, its structure includes: a first-level desulfurization and dust removal device for flue gas; a second-level desulfurization and dust removal device for second-level desulfurization and dust removal treatment A dedusting device; and an ammonia addition device externally connected to the secondary desulfurization and dedusting device and participating in ammonia desulfurization;

[0062] Wherein, the first-level desulfurization and dust removal device includes a Venturi dust removal tower 30, a first-level desulfurization water pool 1, a second-level desulfurization water pool 2, and a third-level desulfurization water pool 3, which constitute a desulfurization water pool and overflow and settle step by step. The first pumping pipeline 6 of the water supply of the Venturi dedusting tower 30 and the first return pipeline 7 connected between the water outlet of the Venturi dedusting tower 30 and the three-stage des...

Embodiment 2

[0067] The difference between this embodiment and embodiment 1 is:

[0068] The Venturi dedusting tower 30 of the first-stage desulfurization and dedusting device is connected to the external chain furnace 31 via the economizer 32; the flue gas generated by the combustion of the chain furnace 31 passes through the ammonia denitrification process in the furnace body and passes through the flue and the province. The coal container 32 enters the first-level desulfurization and dust removal treatment process; the ammonia denitrification treatment device includes: a calcium carbonate adding tank 29 is installed above the coal seam in the furnace body of the chain furnace, by which calcium carbonate is added above the coal seam; An ammonia water tank 28 for adding ammonia water or urea is installed in the high temperature zone where the temperature of the furnace body is greater than 200°C. The ammonia water tank 28 is connected with the external ammonia water tank 12 of the secondar...

experiment example

[0070] Material preparation:

[0071] Coal used in the test: low calorific value 5000cal / g; volatile matter 28.32%; total sulfur 0.6%; total water 13.25%;

[0072] Ammonia water with a concentration of 25%: 6T;

[0073] Limestone: 1 ton (200 mesh) Calcium oxide: 1 ton (calcium content > 80%) Magnesium oxide: 1 ton (magnesium content > 75%) Egg shell: 1 ton (calcium carbonate content > 80%)

[0074] Boiler model: chain grate quick-install hot water boiler (DZL4.2-1.0 / 110 / 70-AII);

[0075] Venturi dust removal tower: HSCL desulfurization water film dust collector (HSCL1-365T / H);

[0076] Clear water spray tower: adopt the clear water spray tower in embodiment 1

[0077] demister

[0078] Inspection instrument: WJ-60B pitot tube parallel automatic smoke and oil sampler (Qingdao Laoshan District Electronic Instrument Co., Ltd.).

[0079] Operation process: start the desulfurization water pump 8 connected to the primary desulfurization pool 1, start the dedusting water pump 10...

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Abstract

The invention relates to a double wet method flue gas desulphurization and dust removal treatment process. The double wet method flue gas desulphurization and dust removal treatment process is characterized in that calcium carbonate and ammonia water or urea are matched in a furnace to remove NO and NO2, then particulate matters and solute carried by first-stage dust removal and desulphurization are cleaned by using second-stage dust removing water through an n-shaped two-stage wet method desulphurization and dust removal process; second-stage water is desulfurized and denitrified by using the characteristics that ammonia is harmless and is low in gaseous conversion temperature; formed ammonium sulfite refluxes for secondary utilization, and a double-alkali method desulphurization process is formed in first-stage dust removing water. The water content in flue gas at the tail end is reduced by adopting a cyclone centrifugal force, and main pollutants such as SO2, NOX and soot in flue gas emission in a boiler can be discharged at ultra-low emission.

Description

technical field [0001] The invention relates to a combustion flue gas treatment process, in particular to a comprehensive treatment process for flue gas desulfurization, denitrification and dust removal, and belongs to the technical field of combustion exhaust gas treatment. Background technique [0002] Shandong Province is a key air pollutant emission control area. Since September 1, 2013, Shandong Province has promulgated the "Shandong Province Boiler Air Pollutant Emission Standard" to adjust the industrial boiler flue gas emission standard to SO 2 <300mg / m 3 , NO X <400 mg / m 3 , Dust<50 mg / m 3 . Upgraded to SO since January 1, 2016 2 <200mg / m 3 NO X <300 mg / m 3 , Dust<20 mg / m 3 . Finding an economical and suitable comprehensive flue gas treatment method is an important issue. [0003] Now in the professional division, desulfurization and denitrification and dust removal are divided into two professional sub-items. As the emission standa...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/50B01D47/10
CPCB01D47/10B01D53/50B01D53/79B01D2251/2062B01D2258/0283Y02A50/20
Inventor 张明鑫
Owner 张明鑫
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