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Exhaust gas treatment system and exhaust gas treatment method

A technology for waste gas treatment and waste gas, which is applied in the direction of gas treatment, separation methods, combustion methods, etc., and can solve the problems of increased maintenance costs for power generation equipment users

Active Publication Date: 2018-11-23
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SO in exhaust gas 3 In the low-temperature equipment downstream of the air heater, it becomes the cause of failures such as equipment corrosion and blockage due to increased ash adhesion, and becomes an important factor that increases maintenance costs for power generation equipment users.

Method used

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  • Exhaust gas treatment system and exhaust gas treatment method
  • Exhaust gas treatment system and exhaust gas treatment method
  • Exhaust gas treatment system and exhaust gas treatment method

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Embodiment Construction

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment, Moreover, when there exist several embodiment, what combined each embodiment is also included in this invention.

[0043] figure 1 It is a schematic configuration diagram of the exhaust gas treatment system of this embodiment. figure 1 Exemplary exhaust gas treatment system 10 is, for example, boiler exhaust gas (hereinafter referred to as "exhaust gas") from boilers 11 such as coal-fired boilers using coal, residual solid matter, etc. ".) 18 removal of nitrogen oxides (NO x ), sulfur oxides (SO x ) and other hazardous substances. It should be noted that, in this embodiment, the combustion mechanism that burns fuel is used as a boiler, but it is not limited thereto. Instead of the boiler 11, various combustion equipment that burns fuel and exhausts exhaust gas can be used.

[0044] Th...

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PUM

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Abstract

The invention provides an exhaust gas treatment system and an exhaust gas treatment method. The exhaust gas treatment system is provided with: a flue through which exhaust gas discharged from a fuel-burning combustion facility flows; a heat exchanger arranged in the flue; a limestone supply device for removing SO3 in the exhaust gas, which flows upstream of the heat exchanger CaCO3 is supplied to the exhaust gas; an SO3 measuring device on the upstream side, which measures SO3 in the exhaust gas flowing at a position upstream of the position where CaCO3 is supplied by the limestone supply device for SO3 removal in the exhaust gas; and a control device, which uses the SO3 meter on the upstream side The amount of SO3 measured by the measuring device and the relationship between the molar ratio of SO3 and CaCO3 determine the supply amount of CaCO3, and the limestone supply device for SO3 removal from the exhaust gas supplies the determined amount of CaCO3 to the flue.

Description

technical field [0001] The present invention relates to an exhaust gas treatment system and an exhaust gas treatment method for treating sulfur oxides by supplying limestone to exhaust gas discharged from a combustion facility. Background technique [0002] Sulfur oxides (SO x ) is mostly sulfur dioxide (SO 2 ), but part of it is converted into sulfur trioxide (SO 3 ). Thanks to SO 3 Because of its high reactivity and corrosiveness, in the past, in order to prevent equipment deterioration, it was generally neutralized by injecting ammonia into the flue. When sulfur (S) from fuel in a thermal power plant is burned in a boiler, it is oxidized by the catalyst component in the fuel or the catalyst of the denitrification device, from sulfur dioxide (SO 2 ) into sulfur trioxide (SO 3 )Element. For this converted SO 3 The concentration is about 30-50ppm at the maximum in the exhaust gas of coal-fired boilers. In the case of fuel oil and heavy fuel, it is also related to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/77B01D53/81B01D53/86B01D53/94F23J15/00
CPCB01D53/346B01D53/501B01D53/83B01D2251/404B01D2251/606B01D2257/302B01D2258/0283F23J15/02F23J15/06F23J2215/20F23J2219/40F23J2219/50F23J2219/60Y02E20/30B01D53/1481B01D53/1493B01D53/80B01D2252/10
Inventor 神山直行香川晴治福田俊大牛久哲
Owner MITSUBISHI POWER LTD