Method for synthesizing high-value products from refinery furnace gas

A method for synthesizing high-value products from refinery furnace gas, comprising a raw material preparation process and a product preparation process, wherein

• the raw material preparation process comprises the following steps:
• S1. removing dust and pollutants from crude furnace gas discharged from a refinery unit to obtain clean furnace gas;
• S2. recovering heat energy from the clean furnace gas via a first waste heat boiler, then delivering the clean furnace gas to a first fuel reactor filled with a solid oxygen carrier material, oxidizing the clean furnace gas by the solid oxygen carrier material to generate carbon dioxide, outputting carbon dioxide and nitrogen mixed exhaust gas at a tail end of the first fuel reactor, and separating the exhaust gas by adsorption to obtain nearly pure carbon dioxide and nearly pure nitrogen;
• S3. delivering an oxygen-depleted solid material transformed from the solid oxygen carrier material after step S2 to a first steam reactor, delivering water vapor to the first steam reactor, and reforming the oxygen-depleted solid material and the water vapor to generate hydrogen, wherein the oxygen-depleted solid material is subjected to partial oxygen recovery to obtain a partially oxygen-recovered solid material;
• S4. delivering the partially oxygen-recovered solid material to an air reactor in which air reacts with the partially oxygen-recovered solid material to obtain nearly pure nitrogen;
• and
• S5. removing dust and pollutants from crude coke oven gas discharged from another refinery unit to obtain clean coke oven gas, delivering the clean coke oven gas to a second fuel reactor filled with a solid oxygen carrier material, oxidizing the clean coke oven gas by the solid oxygen carrier material to obtain synthesis gas comprising carbon monoxide and hydrogen, delivering an oxygen-depleted solid material transformed from the solid oxygen carrier material to a second steam reactor in a second stage, delivering water vapor to the second steam reactor, and reforming the oxygen-depleted solid material and the water vapor to generate hydrogen;
• wherein the product preparation process comprises the following steps:
• S6. adjusting a hydrogen-carbon ratio or hydrogen-nitrogen ratio of the nearly pure carbon dioxide, the nearly pure nitrogen, and the nearly pure hydrogen, and delivering the adjusted nearly pure carbon dioxide and hydrogen to a mixing homogenizer to prepare methanol or ammonia synthesis gas;
• S7. delivering the methanol or ammonia synthesis gas to a pressure buffer for pressurization, and then delivering the pressurized synthesis gas to a tower pre-heater;
• and
• S8. delivering the pre-heated methanol or ammonia synthesis gas to a synthesis tower for synthesis reaction, and obtaining methanol or ammonia products after gas-liquid separation.