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Denitration catalyst, preparation method for denitration catalyst and method for reducing nitrogen oxide emission of circulating fluidized bed boiler

A technology of denitrification catalyst and circulating fluidized bed, which is applied in the field of reducing nitrogen oxide emissions from circulating fluidized bed boilers, denitrification catalyst and its preparation, which can solve the transfer of pollutants, the aggravation of the blue plume of exhaust flue gas, and the increase of device operation issues of complexity

Active Publication Date: 2019-01-15
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In response to 50mg / m 3 The company has added measures such as selective catalytic reduction (SCR), low-temperature oxidation (such as LoTOx and COA, etc.) at the back, but SCR catalysts will cause SO 2 to SO 3 conversion, so that the SO in the flue gas 3 The increase in content will cause corrosion and blockage of equipment at the rear of the SCR, and aggravate the blue smoke plume of the exhaust gas; low-temperature oxidation has problems such as pollutant transfer and high denitrification costs; this undoubtedly increases the complexity of device operation and increases the operating cost of denitrification devices. Eliminates the advantages of low-cost pollution control of CFB boilers

Method used

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  • Denitration catalyst, preparation method for denitration catalyst and method for reducing nitrogen oxide emission of circulating fluidized bed boiler
  • Denitration catalyst, preparation method for denitration catalyst and method for reducing nitrogen oxide emission of circulating fluidized bed boiler
  • Denitration catalyst, preparation method for denitration catalyst and method for reducing nitrogen oxide emission of circulating fluidized bed boiler

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preparation example Construction

[0025] Some embodiments of the present invention also provide the preparation method of the above-mentioned denitration catalyst, which includes: activated alumina, fly ash of a coal-fired circulating fluidized bed boiler with a carbon content of less than 6.0wt%, salts of lanthanide elements, and transition metals Roasting the green balls prepared by salts and binders.

[0026] Further, in some embodiments, the preparation method of the denitration catalyst specifically includes:

[0027] S1. Activated alumina, coal-fired circulating fluidized bed boiler fly ash with a carbon content of less than 6.0 wt%, salts of lanthanide elements, salts of transition metals, and a binder are used to prepare green pellets.

[0028] Specifically, the solid mixture obtained by mixing activated alumina and fly ash of a coal-fired circulating fluidized bed boiler with a carbon content of less than 6.0wt% is placed in a turntable rolling machine, and the solid mixture is sprayed by a sprayer wh...

Embodiment 1

[0041] Take by weighing activated alumina 357.1g (dry basis is 70wt%), carbon content is lower than 6.0wt% coal-fired CFB boiler fly ash 444.4g (dry basis is 90wt%) and 40g pore-enlarging agent is put into rolling ball machine, Stir evenly; weigh 137.5g of lanthanum nitrate and put it into beaker 1 with a volume of 500ml, add 150g of distilled water, stir to make it completely dissolve; weigh 161.3g of copper nitrate and put it into beaker 2 with a volume of 500ml, add 200g of distilled water, stir Dissolve it completely; weigh 975g of aluminum sol and put it into beaker 3; weigh 210g of dilute hydrochloric acid solution with a concentration of 15% and put it into beaker 4; The solution, the copper nitrate solution in beaker 2, the aluminum sol in beaker 3 and the dilute hydrochloric acid solution in beaker 4 are sprayed into the rolling ball machine, so that the materials in the rolling ball machine gradually grow into balls. Sieve the pellets of the material into pellets of ...

Embodiment 2

[0043] Take by weighing activated alumina 500.0g (dry basis is 70wt%), carbon content is lower than 6.0wt% coal-fired CFB boiler fly ash 333.3g (dry basis is 90wt%) and 30g pore expander are put into rolling ball machine, Stir evenly; weigh 125.0g of cerium nitrate and put it into beaker 1 with a volume of 500ml, add 150g of distilled water, stir to make it completely dissolved; weigh 320.0g of zinc nitrate and put it into beaker 2 with a volume of 1000ml, add 400g of distilled water, stir Dissolve it completely; weigh 1100.0g of aluminum sol and put it into beaker 3; weigh 70g of dilute hydrochloric acid solution with a concentration of 15% and put it into beaker 4; The lanthanum solution, the copper nitrate solution in beaker 2, the aluminum sol in beaker 3 and the dilute hydrochloric acid solution in beaker 4 are sprayed into the ball rolling machine, so that the materials in the ball rolling machine grow into balls gradually. Sieve the pellets of the material into pellets ...

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Abstract

The invention discloses a denitration catalyst, a preparation method for the denitration catalyst and a method for reducing nitrogen oxide emission of a circulating fluidized bed boiler. The method for reducing the nitrogen oxide emission comprises the step that the denitration catalyst is added into a boiler dense-phase bed of the circulating fluidized bed boiler. The preparation method for the denitration catalyst comprises the step that green pellets prepared from active aluminum oxide, coal-fired circulating fluidized bed boiler fly ash with the carbon content lower than 6.0wt%, lanthanidesalts, transition metal salts and adhesive are roasted so as to obtain the denitration catalyst prepared from the following components in parts by weight: 15-50 parts of activated aluminum oxide, 12-45 parts of coal-fired circulating fluidized bed boiler fly ash with the carbon content of lower than 6.0wt%, 1-7 parts of lanthanide oxide, 2-15 parts of transition metal oxide and 15-25 parts of adhesive. According to the denitration catalyst, the preparation method for the denitration catalyst and the method for reducing the nitrogen oxide emission of the circulating fluidized bed boiler, in the combustion process of CFB fire coal, under the action of the denitration catalyst, NOx in flue gas is converted in situ in a combustion chamber of the boiler, and therefore the purpose of reducing NOx in the flue gas is achieved.

Description

technical field [0001] The invention relates to the technical field of denitrification, in particular to a denitrification catalyst, a preparation method thereof and a method for reducing nitrogen oxide emissions from circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed (CFB) boiler, as one of the most successful clean coal combustion technologies in commercial application, has the advantages of good adaptability to coal types, excellent load regulation performance, and easy comprehensive utilization of ash. Compared with pulverized coal boilers, it has the advantage of natural low NOx emission, which can generally reach 200mg / m 3 , to meet national and regional emission standards. However, with the implementation of the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), the NOx emission concentration is required to be 100mg / m 3 (in NO 2 Calculated, converted to dry basis, O 2 volume fraction 6.0%), even f...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/889B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/20B01D2251/204B01D2251/2062B01D2255/2063B01D2255/2065B01D2255/2066B01D2255/2068B01D2255/2073B01D2255/20738B01D2255/20746B01D2255/20761B01D2255/20792B01D2255/2092B01J23/83B01J23/8892
Inventor 齐文义郝代军杨金辉李小苗左世伟陈千惠黄延召孟学峰
Owner SINOPEC ENG GRP CO LTD