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Fume desulfurizing process with enhancement limestone method

A desulfurization process and limestone technology, applied in the field of flue gas desulfurization process and enhanced limestone flue gas desulfurization process, can solve the problems of high operating cost and large investment, and achieve the advantages of reducing desulfurization cost, improving desulfurization efficiency and improving utilization rate. Effect

Active Publication Date: 2007-03-07
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

[0004] However, the main disadvantages of the existing wet limestone / lime flue gas desulfurization technology are the large investment and the need to control the oxidation of sulfite generated during the desulfurization process (forced oxidation or inhibited oxidation) to ensure the reliable operation of the system, resulting in operating costs high

Method used

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  • Fume desulfurizing process with enhancement limestone method
  • Fume desulfurizing process with enhancement limestone method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Referring to Fig. 1, absorbent limestone powder and additives are stored in limestone silo 5 and additive silo 6 respectively, and enter digestion reactor 8 through respective screw conveyors 7 and metering devices. If it is a limestone block, it will enter the limestone bin 5 after being ground into powder by the limestone grinder 18. If it is a liquid additive, the additive can be directly delivered to the digestion reactor 8 through the liquid delivery pipeline.

[0038] Limestone and additives are reacted with water (which may be process make-up water 16 or filtrate from filtrate tank 13 or overhead flow from cyclone 10) in digestion reactor 8 to form an absorption slurry.

[0039] The absorption slurry after the digestion reaction is delivered to the output pipeline of the main circulation pump 15 through the absorption slurry delivery pump 9 , or directly enters the absorption tower 1 .

[0040] The sulfur-containing flue gas 2 enters the absorption tower 1 and r...

Embodiment 2

[0045] According to the process described in Example 1, the 220t / h boiler supporting flue gas desulfurization is carried out. Boiler flue gas inlet SO 2 The concentration is 9690mg / m 3 , the temperature is 160°C, the inlet pH is 5.0, and the liquid-gas ratio is 20.0L / m 3 , the sodium sulfate ion concentration is 2852mg / L, the calcium ion concentration is 620mg / L, the absorption slurry concentration mass ratio is 11.7%, and the desulfurization efficiency reaches 97.0%.

Embodiment 3

[0047] Carry out 130t / h boiler matching flue gas desulfurization process according to the technological process described in embodiment 1, boiler flue gas imports SO 2 The concentration is 2050mg / m 3, the temperature is 155°C, the inlet pH is 6.5, and the liquid-gas ratio is 5.0L / m 3 , the concentration of sodium nitrate is 5096mg / L, the concentration of calcium ion is 600mg / L, the concentration-mass ratio of the absorption slurry is 13.0%, and the desulfurization efficiency is 96.1%.

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Abstract

The invention relates to a method for desulfurising smoke, especially a strengthen limestone smoke desulfurising method. Wherein, it comprises adding limestone and additive into reactor, to be mixed and reacted with water to generate adsorption slurry; inputting slurry into adsorption tower; the sulfur smoke enters into tower to react with slurry; the purified smoke is discharge outside the tower; the slurry with sulfur dioxide will be discharged at the bottom of tower to be recycled. The invention can improve desulfurising efficiency at 5-10% and improve the absorber utilization at 1-10%.

Description

technical field [0001] The invention relates to a flue gas desulfurization process, in particular to an enhanced limestone method flue gas desulfurization process, which is mainly used in the technical field of air pollution control and prevention. Background technique [0002] Flue gas desulfurization has a long history, and research in this area was carried out as early as more than one hundred years ago. At present, desulfurization technology can be summarized into three categories: (1) desulfurization before combustion, such as coal washing, microbial desulfurization; (2) desulfurization during combustion, such as industrial briquette sulfur fixation, calcium injection in the furnace; Desulfurization, namely flue gas desulfurization (FGD). The FGD method is the only large-scale commercialized desulfurization technology in the world. FGD technology mainly uses absorbent or adsorbent to remove SO in flue gas 2 , and transform it into a more stable sulfur compound. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80
Inventor 吴忠标莫建松程常杰李福才王凯南程斌徐卫平
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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