Fangxin Lihua's low-temperature SCR denitrification of sintering flue gas demonstrates huge energy-saving advantages - the energy-saving rate of the flue gas whitening and denitrification system of the 12 # sintering machine of Nissan Iron and Steel exceeds 38%
Publishdate：2020-06-19 Views：19
Recently, commissioned by Tongxing Environmental Protection Technology Co., Ltd. and Beijing Fangxin Lihua Technology Co., Ltd., after six days of continuous testing, Shandong Special Equipment Inspection and Research Institute Co., Ltd. issued a test report on the energy consumption of the 12 # sintering machine flue gas whitening and denitrification system of Rizhao Iron and Steel Holding Group Co., Ltd. The report shows that with the same set of denitration systems, while maintaining consistent parameters such as inlet flue gas volume, inlet flue gas NOx concentration, and outlet NOx concentration, the denitration system operates more energy-efficient at 200 ℃ than at 280 ℃, which is equivalent to 1 Nm per standard cubic meter ³） The energy consumption of blast furnace gas under the original flue gas is as high as 38.32%.
The 12 # 360 ㎡ sintering machine of Rizhao Iron and Steel adopts the process of "main exhaust fan+MGGH heat exchange (cooling)+lime gypsum desulfurization+calcium desulfurization (adding slurry condenser)+wet electrostatic precipitator+flue gas condenser+flue gas demister+MGGH heat exchange (heating)+GGH heat exchange (cold side)+hot air furnace heating and heating+medium and low temperature SCR denitrification (operating at a wide temperature of 200-280 ℃)+GGH heat exchange (hot side)+desulfurization and denitrification induced draft fan+new chimney" for flue gas treatment, The SCR denitrification adopts the concept of "medium temperature design and wide temperature operation", that is, the denitrification body and equipment selection are designed according to 280 ℃, and the denitrification operation is designed according to the temperature range of 200 ℃ -280 ℃.
The test report shows that the inlet flue gas volume during denitrification operation at 280 ℃ is 718569.80Nm ³/ h. The calorific value of blast furnace gas is 3858.01KJ/Nm ³， Blast furnace gas consumption 14334.59Nm ³/ h. Converted to 1Nm ³ The energy consumption of blast furnace gas for raw flue gas (per standard cubic meter) is 76.96KJ/Nm ³， When operating at 200 ℃ for denitrification, the inlet flue gas volume is 718477.63Nm ³/ h. Blast furnace gas calorific value 3904.56KJ/Nm ³， The gas consumption of blast furnace is 8734.58Nm ³/ h. Converted to 1Nm ³ The energy consumption of blast furnace gas for raw flue gas (per standard cubic meter) is 47.47KJ/Nm ³， The denitrification system operates at 200 ℃, saving 38.32% of gas energy consumption compared to operating at 280 ℃.
According to the annual operating time of 7920 hours for the 12 # 360 ㎡ sintering machine of Rizhao Iron and Steel, the low-temperature SCR denitrification system can save approximately 43.5 million Nm of blast furnace gas for the owner each year ³ (Calorific value 3858.01KJ/Nm) ³）。 According to the price of blast furnace gas, 0.1 yuan/m ³ Based on the unit price calculation, this item alone can save 4.35 million yuan in annual operating costs, fully demonstrating the huge energy-saving potential of low-temperature denitrification.
It is necessary to meet the current and future stricter pollutant emission standards, ensure the continuous and stable compliance of pollutant emissions, and also consider the energy consumption of equipment operation and secondary investment returns. How to find a balance point and achieve a win-win situation of environmental protection standards and economic operation tests the intelligence of managers. After several rounds of inspection and exchange, Rizhao Steel finally adopted the concept of "medium temperature design and wide temperature operation", achieving the goal of both environmental protection and energy conservation.
Beijing Fangxin Lihua Technology Co., Ltd. is a professional research and development manufacturer of non electric low-temperature SCR denitrification catalysts. In recent years, it has provided smoke control products and project services to well-known enterprises in non electric industries such as steel sintering, pelletizing, coking, garbage incineration, lime kiln, gas boiler, acid washing, papermaking, glass, ceramics, refractory materials, etc., and has established a good reputation in the industry. In the future, the company will continuously strive to provide customers with more energy-efficient denitrification solutions while meeting ultra-low emission targets.
Recently, commissioned by Tongxing Environmental Protection Technology Co., Ltd. and Beijing Fangxin Lihua Technology Co., Ltd., after six days of continuous testing, Shandong Special Equipment Inspection and Research Institute Co., Ltd. issued a test report on the energy consumption of the 12 # sintering machine flue gas whitening and denitrification system of Rizhao Iron and Steel Holding Group Co., Ltd. The report shows that with the same set of denitration systems, while maintaining consistent parameters such as inlet flue gas volume, inlet flue gas NOx concentration, and outlet NOx concentration, the denitration system operates more energy-efficient at 200 ℃ than at 280 ℃, which is equivalent to 1 Nm per standard cubic meter ³） The energy consumption of blast furnace gas under the original flue gas is as high as 38.32%.
The 12 # 360 ㎡ sintering machine of Rizhao Iron and Steel adopts the process of "main exhaust fan+MGGH heat exchange (cooling)+lime gypsum desulfurization+calcium desulfurization (adding slurry condenser)+wet electrostatic precipitator+flue gas condenser+flue gas demister+MGGH heat exchange (heating)+GGH heat exchange (cold side)+hot air furnace heating and heating+medium and low temperature SCR denitrification (operating at a wide temperature of 200-280 ℃)+GGH heat exchange (hot side)+desulfurization and denitrification induced draft fan+new chimney" for flue gas treatment, The SCR denitrification adopts the concept of "medium temperature design and wide temperature operation", that is, the denitrification body and equipment selection are designed according to 280 ℃, and the denitrification operation is designed according to the temperature range of 200 ℃ -280 ℃.
The test report shows that the inlet flue gas volume during denitrification operation at 280 ℃ is 718569.80Nm ³/ h. The calorific value of blast furnace gas is 3858.01KJ/Nm ³， Blast furnace gas consumption 14334.59Nm ³/ h. Converted to 1Nm ³ The energy consumption of blast furnace gas for raw flue gas (per standard cubic meter) is 76.96KJ/Nm ³， When operating at 200 ℃ for denitrification, the inlet flue gas volume is 718477.63Nm ³/ h. Blast furnace gas calorific value 3904.56KJ/Nm ³， The gas consumption of blast furnace is 8734.58Nm ³/ h. Converted to 1Nm ³ The energy consumption of blast furnace gas for raw flue gas (per standard cubic meter) is 47.47KJ/Nm ³， The denitrification system operates at 200 ℃, saving 38.32% of gas energy consumption compared to operating at 280 ℃.
According to the annual operating time of 7920 hours for the 12 # 360 ㎡ sintering machine of Rizhao Iron and Steel, the low-temperature SCR denitrification system can save approximately 43.5 million Nm of blast furnace gas for the owner each year ³ (Calorific value 3858.01KJ/Nm) ³）。 According to the price of blast furnace gas, 0.1 yuan/m ³ Based on the unit price calculation, this item alone can save 4.35 million yuan in annual operating costs, fully demonstrating the huge energy-saving potential of low-temperature denitrification.
It is necessary to meet the current and future stricter pollutant emission standards, ensure the continuous and stable compliance of pollutant emissions, and also consider the energy consumption of equipment operation and secondary investment returns. How to find a balance point and achieve a win-win situation of environmental protection standards and economic operation tests the intelligence of managers. After several rounds of inspection and exchange, Rizhao Steel finally adopted the concept of "medium temperature design and wide temperature operation", achieving the goal of both environmental protection and energy conservation.
Beijing Fangxin Lihua Technology Co., Ltd. is a professional research and development manufacturer of non electric low-temperature SCR denitrification catalysts. In recent years, it has provided smoke control products and project services to well-known enterprises in non electric industries such as steel sintering, pelletizing, coking, garbage incineration, lime kiln, gas boiler, acid washing, papermaking, glass, ceramics, refractory materials, etc., and has established a good reputation in the industry. In the future, the company will continuously strive to provide customers with more energy-efficient denitrification solutions while meeting ultra-low emission targets.
