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Flue gas dust removal, desulfurization and denitration integrated system and method

A technology for desulfurization and denitrification, flue gas, applied in the direction of chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of catalyst toxicity, low NOx removal rate, air pollution, etc., achieve difficult removal and improve denitrification efficiency , High removal efficiency

Active Publication Date: 2015-11-18
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's NOx control technologies can be divided into two categories: one is the NOx generation control technology in the combustion process, which mainly includes air staged combustion, fuel staged combustion, concentration deviation combustion, and flue gas recirculation technologies. The rate is relatively low, no more than 75%. The other is flue gas denitrification technology, including wet denitrification and dry denitrification. Among them, dry denitrification is the most widely used, mainly including SNCR technology and SCR technology. The NOx removal rate can reach 50% to 70%; the NOx removal rate of the latter can reach more than 90%. Among them, the SCR technology has the highest denitrification efficiency, but the research on SCR technology in my country started relatively late, and the early projects mainly relied on imports. Both SCR and SNCR denitrification processes need to spray urea or ammonia. The escape of ammonia will pollute the atmosphere, because ammonia is a substance that intensifies smog; SCR technology also has the problem of catalyst poisoning and failure, and the catalyst is poisonous. After the failure of the catalyst, further waste treatment is required. Therefore use and waste disposal costs are higher
As mentioned above, the flue gas purification system operated independently in three stages of dust removal, desulfurization and denitrification is complex and huge, with high operation and maintenance costs, high energy consumption and power consumption

Method used

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  • Flue gas dust removal, desulfurization and denitration integrated system and method

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Embodiment 1

[0031] 3 boilers with a capacity of 25t / h, the designed flue gas flow at the system inlet is 104000Nm 3 / h. The temperature of the saturated flue gas is 55°C, and the volume fraction of oxygen content in the flue gas is 16%. The dust concentration in the flue gas is 50mg / Nm 3 , SO 2 The concentration is 125mg / Nm 3 ,NO X The concentration is 176mg / Nm 3 . NO X The mass fraction of NO in the NO is 95%, NO 2 The mass fraction is 5%.

[0032] The dust removal and desulfurization agent of the system adopts NaOH solution with a concentration of 30%, and the denitrification agent adopts H with a concentration of 35%. 2 o 2 and 30% NaOH mixed solution.

[0033] The size of the tray tower body in the system is φ4.8×12.5, and the material is carbon steel lining rubber; the diameter of the tray is also 4.8m, and the material is 316Lss; the material of the mist eliminator is polypropylene; the flow rate of the main circulation pump is 480m 3 / h, the material is 316Lss; the over...

Embodiment 2

[0038] 5 For a boiler with a capacity of 20 / h, the designed flue gas flow at the system inlet is 150,000Nm 3 / h. The temperature of the saturated flue gas is 55°C, and the volume fraction of oxygen content in the flue gas is 9%. The dust concentration in the flue gas is 76mg / Nm 3 , SO 2 The concentration is 75mg / Nm 3 ,NO X The concentration is 148mg / Nm 3 . NO X The mass fraction of NO in the NO is 95%, NO 2 The mass fraction is 5%.

[0039] The system dust removal and desulfurization agent adopts NaOH solution with a concentration of 30%, and the destocking agent adopts H with a concentration of 35%. 2 o 2 and 30% NaOH mixed solution.

[0040] The size of the system tray tower body is φ5.6×11.5, and the material is carbon steel lining rubber; the diameter of the tray is also 5.6m, and the material is 316Lss; the material of the mist eliminator is polypropylene; the flow rate of the main circulation pump is 680m 3 / h, the material is 316Lss; the overall size of the ...

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Abstract

The invention discloses a flue gas dust removal, desulfurization and denitration integrated system and method. The system comprises a baffle tower body, an ozonator, a soft water processor, a wet type induced draft fan, a chimney and a waste reservoir, wherein a partition type liquid accumulation tank, a flue gas inlet, a first tower plate layer, a first layer of demister, a second tower plate layer, a second layer of demister and a sprinkling layer are arranged in the baffle tower body from bottom to top in sequence. The partition type liquid accumulation tank evenly divided into two chambers is adopted for storing a desulfurizing agent and a denitration agent. A sealing cover is arranged on the top of the denitration agent liquid accumulation tank portion to prevent the desulfurizing agent and the denitration agent from being mixed. The invention further provides a flue gas dust removal, desulfurization and denitration integrated method of the system. By the adoption of the flue gas dust removal, desulfurization and denitration integrated system and method, the functions of heating flue gas, reducing the liquid drop carrying rate of flue gas, reducing the relative humidity of flue gas and protecting a lower flue and the chimney are realized, the influence of composite low-temperature corrosion on the system caused by wet flue gas is small, and manufacturing cost is reasonable relatively.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification and emission control in coal-burning industrial processes, and in particular relates to an integrated system and method for flue gas dust removal, desulfurization and denitrification. Background technique [0002] my country's flue gas purification system is usually divided into three stages: dust removal, desulfurization, and denitrification, and each stage does not interfere with each other. The dust removal method mainly includes the use of electrostatic precipitator and bag filter for dust removal, but the dust removal efficiency of electrostatic precipitator is affected by coal, fly ash composition, corona characteristics, etc. The components of the flue gas are relatively sensitive. If the filter bag is used improperly, it is easy to be damaged and the emission exceeds the standard. At present, the old filter bag cannot be used as a resource, causing secondary pollution. The d...

Claims

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Application Information

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IPC IPC(8): B01D50/00B01D53/75B01D53/56B01D53/50
Inventor 赵钦新孙一睿杨文君潘佩媛谢昌亚王云刚
Owner XI AN JIAOTONG UNIV