10results about How to "Solve coking" patented technology

The invention discloses a built-in heat exchange double fluidized bed reaction device, which is used for a biomass raw material hydrogen production process, and comprises: a gasification chamber, which is of a cylindrical structure and is provided with a conical surface at the bottom, and the conical surface is provided with a hole for introducing bubbling fluidizing air; the combustion chamber is of a tubular structure and is arranged in the gasification chamber in a sleeved mode, the bottom of the combustion chamber is in an open state, and the combustion chamber is arranged in the conical surface area and used for introducing vertically-upward combustion-supporting air; the material returning units are arranged at the upper part of the reaction device, are uniformly arranged along the circumferential direction and are used for carrying the high-temperature bed material particles from the combustion chamber to an annular gasification area outside the combustion chamber and mixing the high-temperature bed material particles with biomass raw materials in the gasification area to produce hydrogen; the material returning unit is provided with a loosening chamber and a material returning chamber, and a bottom plate of the loosening chamber is obliquely arranged towards the material returning chamber. Through the built-in design of the double fluidized beds, the feeding pipe and the return feeder are prevented from being exposed at room temperature, and the heat loss of the reactor is reduced; and meanwhile, the device can provide enough regeneration time for the bed material under the condition of keeping a relatively high solid conveying rate.

The invention discloses a production process of fluoride-free anti-wicking polyester fibers. The production process comprises the following steps: S1, carrying out solid-phase polycondensation treatment on a polyester chip raw material to obtain a high-viscosity chip; s2, performing melt spinning on the high-viscosity slices to obtain tows; s3, performing first oiling treatment on the tows from the spinning channel, wherein an oil agent for the first oiling is a basic spinning oil agent; s4, the tows are subjected to multi-stage drafting hot roller sizing and main interlacer treatment in sequence; s5, oiling the tows for the second time, wherein the oiling agent for oiling for the second time is functional fluoride-free oiling agent; s6, winding forming, inspection and packaging; and S7, carrying out curing treatment on the packaging fibers. The problems of fuming and coking at a high-temperature hot roller are solved, meanwhile, the long-term anti-wicking performance of the fluoride-free anti-wicking polyester fiber is improved through curing treatment, the anti-wicking performance of the fluoride-free anti-wicking polyester fiber is improved, the problems of fuming and coking at the high-temperature hot roller are solved, and the service life of the fluoride-free anti-wicking polyester fiber is prolonged. The long-term anti-wicking performance of the fluorine-free anti-wicking polyester fiber is improved.

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 invention discloses a two-section type built-in double fluidized bed reaction device, which is used for a biomass raw material chemical looping hydrogen production process, and each section of built-in double fluidized bed comprises: a gasification chamber which is of a cylindrical structure and is provided with a conical surface at the bottom, and the conical surface is provided with a hole for introducing bubbling fluidizing air; the combustion chamber is of a tubular structure and is arranged in the gasification chamber in a sleeved mode, the bottom of the combustion chamber is in an open state, and the combustion chamber is arranged in the conical surface area and used for introducing vertically-upward combustion-supporting air; the material returning units are arranged at the upper part of the reaction device, are uniformly arranged along the circumferential direction and are used for carrying the high-temperature bed material particles from the combustion chamber to an annular gasification area outside the combustion chamber and mixing the high-temperature bed material particles with biomass raw materials in the gasification area to produce hydrogen; the material returning unit is provided with a loosening chamber and a material returning chamber, and a bottom plate of the loosening chamber is obliquely arranged towards the material returning chamber; the two sections of built-in double fluidized beds are connected in series and are used for introducing the hydrogen-containing synthesis gas prepared by the first section of double fluidized bed into the combustion chamber of the second section of double fluidized bed.

The invention provides a petroleum coke production process which comprises the following steps: (1) heating a first raw material, feeding the heated first raw material into a delayed coking device for reaction, and stopping feeding the first raw material when the reaction time reaches 10-60%, preferably 20-40%, of the whole reaction period; and (2) heating the second raw material, feeding the heated second raw material into a delayed coking device, reacting to obtain petroleum coke after the reaction is finished, and further fractionating an oil-gas material flow generated by the reaction. The process provided by the invention solves the problem of ethylene tar treatment on one hand, can obviously improve the problem of high volatile component content of petroleum coke obtained by taking ethylene tar as a raw material, can reduce the coking tendency of a furnace tube of a heating furnace, and prolongs the operation period of the heating furnace.

The invention discloses a mixed processing method of high-sulfur crude oil and high-acid crude oil. The method comprises the following steps: (1) respectively pretreating the high-sulfur crude oil and the high-acid crude oil; (2) mixing the pretreated high-sulfur crude oil and the pretreated high-acid crude oil obtained in the step (1), mixing with alkali metal, and enabling the mixture to enter an alkali metal treatment reaction zone for reaction; and (3) carrying out post-treatment on the reaction effluent obtained in the step (2) to obtain a final product. According to the method, high-sulfur crude oil and high-acid crude oil are jointly processed, and low-sulfur and low-acid high-quality raw materials are provided for the subsequent processing process.

The invention provides a composite coating for a water cooling wall, and relates to the technical field of anticorrosive paints.The composite coating comprises a bottom coating, a middle coating and a face coating; for the middle coating, the ratio of the number of particles with the size larger than 0.5 mm to the total number of particles is larger than or equal to 80%; part of particles of the face coating are embedded into particle gaps of the middle coating to form a fusion structure, and the face coating is tightly connected with the middle coating through the fusion structure. According to the invention, the large-particle middle coating is added into the composite coating to provide skeleton support for the face coating, and after the thickness of the face coating is reduced, the face coating in the particle gaps of the middle coating still exerts the anti-coking performance of the coating, so that the corrosion resistance of the composite coating is greatly improved, and the service life of the composite coating is prolonged. The comprehensive performance and the service life of the composite coating are prolonged.

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.