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Blast furnace gas dehumidification benefits
(1) When the blast furnace gas contains water, it is vaporized and heated together with the blast furnace gas during the combustion and utilization process, and heat is consumed. When the water content of blast furnace gas is reduced from 70.62 g/m3 to 10 g/m3, the removed part of the water will no longer waste energy during gas transportation and utilization, and it is estimated that the removed water can consume 6%~10% of the total heat energy of the gas during the gas combustion process.
(2) The water content of blast furnace gas decreases, the calorific value increases, the theoretical combustion temperature of blast furnace gas increases, and the hot air temperature increases. When the moisture in the blast furnace gas is reduced to 10 g/m3, the theoretical combustion temperature of the blast furnace gas can be increased by 55 °C, the corresponding hot air temperature can be increased by more than 50 °C, and the calorific value can be increased by 205 k J/m3.
(3) Increasing the hot air temperature is very beneficial to the operation of the blast furnace. The increase of the hot air temperature increases the heat brought in by the hot air, which can reduce the coke consumption and reduce the coke ratio. Secondly, increasing the hot air temperature is conducive to increasing the amount of coal injection in the blast furnace and the replacement rate of pulverized coal, so as to achieve the purpose of saving coke. The moisture in the blast furnace gas can increase the hot air temperature by more than 50 °C, and the focal ratio can be reduced by 10 kg/t (the hot air temperature can be increased by 100 °C, and the focal ratio can be reduced by 15~20 kg/t). It can inject 17.5kg/t more coal (the air temperature is increased by 100 °C, allowing more coal injection of about 35 kg/t[4]).
(4) Blast furnace gas contains acid gas, when these acid gases encounter condensate in the gas into weak acid, weak acid water quality has strong corrosiveness to the pipeline, blast furnace gas water content corrosion on the inner wall of the pipeline seriously exceeds the national standard GB50050- 2007. It is estimated that the corrosion rate of blast furnace gas pipeline in the atmosphere is 56.16 μm/a, the average corrosion rate in condensate is 363.94 μm/a, corrugated compensator and other components not only have condensate accumulation, but also stress corrosion aggravates the corrosion rate, so removing the condensate of blast furnace gas, pipelines and other conveying equipment can extend the service life of at least 363.94/56.16=6.48 times.
(5) While removing the moisture in the blast furnace gas, the dust content is also reduced, the quality of the blast furnace gas is improved, the calorific value is increased, so that the heat utilization rate of the gas equipment is improved, and at the same time, the impurity content is reduced, which reduces the negative impact on the quality of the hot blast furnace, heating furnace, boiler, steam turbine and other gas equipment and final product quality.
(6) Due to the reduction of water content in blast furnace gas, the overflow of the water seal tank is also reduced, saving drainage equipment, reducing the labor intensity of workers, eliminating the overflow of condensate, and avoiding environmental pollution. Blast furnace gas dehumidification not only improves economic benefits, but also protects the environment, and its social benefits are also significant.
Blast furnace gas dehumidification benefits
(1) When the blast furnace gas contains water, it is vaporized and heated together with the blast furnace gas during the combustion and utilization process, and heat is consumed. When the water content of blast furnace gas is reduced from 70.62 g/m3 to 10 g/m3, the removed part of the water will no longer waste energy during gas transportation and utilization, and it is estimated that the removed water can consume 6%~10% of the total heat energy of the gas during the gas combustion process.
(2) The water content of blast furnace gas decreases, the calorific value increases, the theoretical combustion temperature of blast furnace gas increases, and the hot air temperature increases. When the moisture in the blast furnace gas is reduced to 10 g/m3, the theoretical combustion temperature of the blast furnace gas can be increased by 55 °C, the corresponding hot air temperature can be increased by more than 50 °C, and the calorific value can be increased by 205 k J/m3.
(3) Increasing the hot air temperature is very beneficial to the operation of the blast furnace. The increase of the hot air temperature increases the heat brought in by the hot air, which can reduce the coke consumption and reduce the coke ratio. Secondly, increasing the hot air temperature is conducive to increasing the amount of coal injection in the blast furnace and the replacement rate of pulverized coal, so as to achieve the purpose of saving coke. The moisture in the blast furnace gas can increase the hot air temperature by more than 50 °C, and the focal ratio can be reduced by 10 kg/t (the hot air temperature can be increased by 100 °C, and the focal ratio can be reduced by 15~20 kg/t). It can inject 17.5kg/t more coal (the air temperature is increased by 100 °C, allowing more coal injection of about 35 kg/t[4]).
(4) Blast furnace gas contains acid gas, when these acid gases encounter condensate in the gas into weak acid, weak acid water quality has strong corrosiveness to the pipeline, blast furnace gas water content corrosion on the inner wall of the pipeline seriously exceeds the national standard GB50050- 2007. It is estimated that the corrosion rate of blast furnace gas pipeline in the atmosphere is 56.16 μm/a, the average corrosion rate in condensate is 363.94 μm/a, corrugated compensator and other components not only have condensate accumulation, but also stress corrosion aggravates the corrosion rate, so removing the condensate of blast furnace gas, pipelines and other conveying equipment can extend the service life of at least 363.94/56.16=6.48 times.
(5) While removing the moisture in the blast furnace gas, the dust content is also reduced, the quality of the blast furnace gas is improved, the calorific value is increased, so that the heat utilization rate of the gas equipment is improved, and at the same time, the impurity content is reduced, which reduces the negative impact on the quality of the hot blast furnace, heating furnace, boiler, steam turbine and other gas equipment and final product quality.
(6) Due to the reduction of water content in blast furnace gas, the overflow of the water seal tank is also reduced, saving drainage equipment, reducing the labor intensity of workers, eliminating the overflow of condensate, and avoiding environmental pollution. Blast furnace gas dehumidification not only improves economic benefits, but also protects the environment, and its social benefits are also significant.
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