Apparatus and method for producing diesel fuel and jet fuel using Fischer-Tropsch synthetic oil

A method for producing diesel fuel and jet fuel, the method comprising:

• 1) transporting Fischer-Tropsch synthetic oil to a pipe that is connected to a raw material inlet of a hydrofining reactor through an oil mixture inlet pipe, introducing circulating hydrogen to the pipe through a circulating hydrogen inlet pipe, mixing and inputting the circulating hydrogen and the Fischer-Tropsch synthetic oil to the hydrofining reactor via the raw material inlet of the hydrofining reactor for a hydrofining reaction in the presence of a hydrofining catalyst to produce hydrofining products;
• 2) allowing the hydrofining products obtained from 1) to enter a hot separator via a hydrofining product inlet of the hot separator to produce separated oil and cracking oil gas;
• discharging the separated oil from the hot separator via a separated oil outlet of the hot separator and introducing the separated oil discharged from the hot separator to a first rectifying column via a separated oil inlet of the first rectifying column, discharging the cracking oil gas from the hot separator via a first gas outlet of the hot separator;
• 3) rectifying the separated oil to yield tail oil fraction, diesel fraction, naphtha fraction, and cracking oil gas in the first rectifying column;
• discharging the tail oil fraction from the first rectifying column through a tail oil fraction outlet of the first rectifying column and allowing the tail oil fraction discharged from the first rectifying column to enter a first mixing chamber through a tail oil fraction inlet of the first mixing chamber;
• allowing the circulating hydrogen to enter the first mixing chamber through a circulating hydrogen inlet of the first mixing chamber;
• mixing the tail oil fraction and the circulating hydrogen in the first mixing chamber to obtain a first resulting mixture and allowing the first resulting mixture to enter a hydrocracking reactor through a first mixture outlet of the first mixing chamber and a first mixture inlet of the hydrocracking reactor;
• discharging the diesel fraction from the first rectifying column through a diesel fraction outlet of the first rectifying column and allowing the diesel fraction discharged from the first rectifying column to enter a second mixing chamber through a diesel fraction inlet of the second mixing chamber;
• introducing renewal hydrogen to enter the second mixing chamber through a renewal hydrogen inlet of the second mixing chamber;
• mixing the diesel fraction and the renewal hydrogen in the second mixing chamber to obtain a second resulting mixture and allowing the second resulting mixture to enter a hydroisomerization reactor through a second mixture outlet of the second mixing chamber and a second mixture inlet of the hydroisomerization reactor;
• discharging the naphtha fraction from the first rectifying column through a naphtha fraction outlet of the first rectifying column;
• and discharging the cracking oil gas from the first rectifying column through a second gas outlet of the first rectifying column;
• 4) hydrocracking the first resulting mixture in the hydrocracking reactor to produce hydrocracking products;
• hydroisomerizing the second resulting mixture in the hydroisomerization reactor to produce hydroisomerization products;
• 5) discharging the hydrocracking products from the hydrocracking reactor through a hydrocracking product outlet of the hydrocracking reactor;
• discharging the hydroisomerization products from the hydroisomerization reactor through a hydroisomerization product outlet of the hydroisomerization reactor;
• mixing the hydrocracking products and the hydroisomerization products to obtain a third resulting mixture and allowing the third resulting mixture to enter a second rectifying column through a hydrogenation product mixture inlet of the second rectifying column;
• rectifying the third resulting mixture to produce cracking oil gas, aviation kerosene, diesel, paraffin, tail oil fraction, and naphtha fraction in the second rectifying column;
• discharging the aviation kerosene from the second rectifying column to an aviation kerosene tank through an aviation kerosene outlet of the second rectifying column, discharging the diesel from the second rectifying column to a diesel tank through a diesel outlet of the second rectifying column;
• discharging the naphtha fraction from the second rectifying column to a naphtha fraction tank through a naphtha fraction outlet of the second rectifying column;
• discharging a mixture of the tail oil fraction and the paraffin from the second rectifying column through a paraffin outlet of the second rectifying column, or recycling the mixture of the tail oil fraction and the paraffin from the second rectifying column along a discharge pipe of the tail oil fraction and paraffin to enter the first mixing chamber via the tail oil fraction inlet of the first mixing chamber to mix with the circulating hydrogen and then to enter the hydrocracking reactor, wherein the paraffin outlet of the second rectifying column is connected to the discharge pipe of the tail oil fraction and paraffin via a tee joint;
• and discharging the cracking oil gas from the second rectifying column through a third gas outlet of the second rectifying column;
• and
• 6) mixing and introducing the cracking oil gas discharged in 2), 3), and 5) to a condensation fractionating column via the a gas inlet of the condensation fractionating column, to yield gas and liquid;
• discharging the gas from the condensation fractionating column via a fourth gas outlet of the condensation fractionating column and then allowing the gas discharged from the condensation fractionating column to enter the hydrofining reactor via the pipe that is connected to the raw material inlet of the hydrofining reactor for cyclic utilization;
• and discharging the liquid from the condensation fractionating column via a liquid outlet of the condensation fractionating column and then converging the liquid discharged from the condensation fractionating column with the naphtha fraction discharged in 3) and 5) to yield ethylene pyrolysis materials.