4results about How to "Solve coking" patented technology

The invention discloses a rare earth tailing-based aerogel catalyst for refractory coal and a preparation method thereof, and the preparation method comprises the following steps: a, pretreating rare earth tailings rich in cerium oxide to obtain raw material powder; b, carrying out modification treatment on the raw material powder obtained in the step a to obtain modified powder; and c, preparing rare earth tailing-based aerogel from the modified powder obtained in the step b, and grinding to obtain the catalyst. The rare earth tailing-based aerogel catalyst prepared by the invention has a relatively high specific surface area and a rich pore structure, obviously improves the combustion efficiency of fire coal, can be suitable for fire-retardant solid fuel, realizes wide-load stable combustion of fire-retardant coal powder, expands the coal type adaptability of a unit, reduces the use amount of long flame coal, and reduces the production cost. The coking problem is effectively solved.

This invention relates to the field of circulating fluidized bed boiler technology, specifically to an anti-clogging structure for the return feed port of a circulating fluidized bed boiler. This structure employs a high-pressure fluidizing air duct embedded in the return feed channel of the circulating fluidized bed boiler, with the port of the embedded section directly opposite the return feed port area where the return feed channel connects to the furnace of the circulating fluidized bed boiler. A high-pressure fluidizing air source is connected to one end of the high-pressure fluidizing air duct, providing fluidizing air that is blown from the port of the embedded section towards the return feed port area, preventing ash and coking in the return feed port area. By embedding a high-pressure fluidizing air duct at the end of the return feed channel, this invention effectively prevents abrupt changes in material flow characteristics and thermal imbalance at the return feed port during load variations, thus preventing the formation of a coke layer on the inner wall and ultimately causing blockage, which is beneficial for ensuring the normal operation of the boiler.

The application relates to the field of ethylene cracking, and discloses an alloy furnace tube and a treatment method and application thereof. The method comprises the following steps: (1) performing first heat treatment on the alloy furnace tube in the presence of a reducing atmosphere to obtain a pretreated alloy furnace tube; and (2) performing second heat treatment on the pretreated alloy furnace tube in the presence of a low-oxygen partial pressure atmosphere to obtain an alloy furnace tube with an oxidation film on the inner surface; wherein the content of oxygen in the reducing atmosphere is 0 ppm; and the dew point of the low-oxygen partial pressure atmosphere is-40 DEG C to 40 DEG C. By performing heat treatment on the alloy furnace tube in the presence of the reducing atmosphere and the low-oxygen partial pressure atmosphere, a dense and stable oxidation film can be formed on the inner surface of the furnace tube, catalytic coking is inhibited or slowed down, the degree of carburization of the furnace tube is reduced, and the service life of the furnace tube is prolonged. The cracking furnace tube provided by the application for a hydrocarbon cracking device can adapt to various hydrocarbon raw materials, and the operation cycle of the cracking furnace is significantly prolonged compared with the prior art.

The utility model discloses a kind of oil furnace method soft carbon black production reactors, including reactor cavity, multiple raw material oil oil gun spray system being arranged at the oil inlet end of reactor cavity and the pressure regulating pipeline of another end;Tangential air pipe is provided on the lateral wall outside reactor cavity;Oil gun spray system includes the feed panel of multiple raw material oil guns being arranged, and raw material oil gun is equipped with axial combustion air sheath on the side of sleeve;Raw material oil is sprayed into reactor cavity by raw material oil gun;Axial combustion air enters reactor cavity from axial combustion air sheath place;Tangential wind enters reactor cavity from tangential air pipe place;Powdered carbon black generated inside reactor cavity is discharged after rising to pressure regulating pipeline with carbon black flue gas.The raw material oil gun of axial combustion air sheath is developed, and then large-size reactor is used again, and multiple raw material oil gun system and the design of tangential / axial wind are matched, more flexible and adjustable perfect spray are provided, the problem of screen residue after coking is solved, and primary particle is made larger.