Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof

A technology for coal-fired power plants and denitration agents, applied in separation methods, chemical instruments and methods, fuels, etc., can solve the problems of complex reburning fuel systems, high carbon content in fly ash, and high operating costs, and achieve simple preparation methods and denitrification High efficiency and improved utilization quality

Inactive Publication Date: 2014-01-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of complex reburning fuel system, high operating cost, high carbon content in fly ash and low denitrificatio

Method used

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  • Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof
  • Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof
  • Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034]In this embodiment, wood chips (SD) are used as raw materials, and after pretreatment processes such as air-drying, crushing, and screening, wood chips with a particle size of less than 5 cm are produced. Weigh about 250g of sawdust samples, put them quickly into a fixed-bed low-temperature pyrolysis carbonization device with a pyrolysis temperature of 250°C and continuous flow of nitrogen (flow rate: 5L / min), turn off the electric heater after pyrolysis for 20 minutes, and Cool down to room temperature. Sawdust charcoal powder (SD250) with a particle size of less than 0.5mm is obtained after crushing, grinding and sieving. Weigh 0.60g of analytically pure Fe with a particle size of less than 0.45mm 2 o 3 and 0.90g of analytically pure urea granules, mixed with 100g of wood chip charcoal powder (SD250) in turn, and mixed thoroughly to prepare wood chip charcoal powder with additives (SD250-UF), and put it into a reagent bottle for later use.

Embodiment 2

[0036] In this embodiment, wood chips (SD) are used as raw materials, and after pretreatment processes such as air-drying, crushing, and screening, wood chips with a particle size of less than 5 cm are produced. Weigh about 200g of sawdust samples, quickly put them into a fixed-bed low-temperature pyrolysis carbonization device with a pyrolysis temperature of 300°C and continuous flow of nitrogen (flow rate: 5L / min), turn off the electric heater after pyrolysis for 20min, and Cool to room temperature. Sawdust charcoal powder (SD300) with a particle size of less than 5mm is obtained after crushing, grinding and sieving.

[0037] Weigh 0.17g NaCl, 0.22g KCl and 0.16g Na 2 CO 3 Analytical pure particles, formulated separately as 5% NaCl, KCl and Na 2 CO 3 solution; the prepared NaCl, KCl and Na 2 CO 3 The solution was evenly sprayed on 100g of wood chip charcoal powder (SD300), and after being fully stirred, it was placed in an oven at 80°C to dry for 2 hours; the dried imp...

Embodiment 3

[0039] In this embodiment, bamboo (BB) is used as raw material, and after pretreatment processes such as air-drying, crushing and sieving, wood pellets with a particle size of less than 5 cm are produced. Weigh about 250g of bamboo samples, quickly put them into a spiral low-temperature pyrolysis carbonization device with a pyrolysis temperature of 275°C and continuous flow of nitrogen (flow rate: 8L / min), turn off the electric heater after pyrolysis for 20min, and Cool to room temperature. Bamboo charcoal powder (BB275) with a particle size of less than 0.5mm was obtained after crushing, grinding and sieving, and put into a reagent bottle for later use.

[0040] Weigh 0.10g NaCl and 0.13g KCl analytically pure particles, and prepare 5% NaCl and KCl solutions respectively; spray the prepared NaCl and KCl solutions evenly on 100g bamboo charcoal powder (BB275) in turn, and place them in the Dry in an oven at 80°C for 2 hours; spray the dried bamboo charcoal powder with 2.50g u...

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Abstract

The invention discloses a coal-fired power plant boiler biomass reburning denitration agent and a preparation method thereof. Based on an advanced reburning denitration technology principle and with biomass energy utilization and coal fired flue gas nitrogen oxides (NOx) control as backgrounds, the biomass reburning denitration agent prepared from biomass/biomass carbon, alkali metal salts (KCl, NaCl, Na2CO3 and the like) and additives (urea, Fe2O3 and the like) is used for controlling emissions of the coal-fired flue gas NOx. The biomass reburning denitration agent which has low water content, high energy density and easy crushing, and is suitable for storage and long distance transportation is prepared through treating processes of biomass raw material pretreatment (drying, crushing and sieving), low temperature pyrolysis (at the temperature of 200-300 DEG C for 10-30 min and under a nitrogen atmosphere), solution (Na2CO3, NaCl and KCl) spraying or dipping, and additives (urea, Fe2O3) mechanical mixing and the like. The biomass reburning denitration agent has the characteristics of wide raw material sources, simple preparation process, low cost, high denitration efficiency and the like, and is suitable for control of emissions of the nitrogen oxides of flue gas in the fields of coal-fired power plants, waste incineration and the like.

Description

technical field [0001] The invention relates to a biomass reburning denitration agent for a coal-fired power station boiler and a preparation method thereof, belonging to the technical field of biomass energy utilization and coal-fired boiler flue gas denitrification. Background technique [0002] my country is a major energy-consuming country dominated by coal. In 2011, my country's thermal power nitrogen oxides (NO x ) emissions as high as 10.5 million tons, accounting for more than 40% of the country's total emissions, its rapid growth exacerbated the deterioration of regional acid rain, partially offset my country's SO 2 Efforts to reduce emissions. The national standard "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) implemented in 2012 clearly stipulates the emission limits of nitrogen oxides from coal-fired power plants, requiring that the concentration of nitrogen oxides emitted by coal-fired power plant boilers shall not exceed 100mg...

Claims

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Application Information

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IPC IPC(8): C10L9/10B01D53/90B01D53/56
Inventor 卢平郝江涛于伟祝秀明徐森荣
Owner NANJING NORMAL UNIVERSITY
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