12 results about "Coke deposition" patented technology

A catalyst regeneration gas loop is operated in a heat exchanger decoking mode. A regeneration gas is diverted away from a burn zone of the catalyst regeneration gas loop and to a heat exchanger, where coke deposits are disposed on a surface of the heat exchanger. The regeneration gas is prevented from flowing to an oxychlorination / calcination zone of the catalyst regeneration gas loop. Within the heat exchanger, the coke deposits are combusted with oxygen of the regeneration gas, thereby removing the coke deposits from the surface of the heat exchanger and producing carbon dioxide. Oxygen is replenished to the regeneration gas. The regeneration gas is recycled to the heat exchanger.

The invention discloses an in-situ synthesized naphtha catalytic cracking agent material and a preparation method thereof, and belongs to the field of petrochemical engineering catalytic materials. According to the method, the porous LaF3 composite material is synthesized in situ on the surface of ZSM-5 through a process route of PVP soft template in-situ attachment, hydroxyl modification, LaF3 in-situ deposition and hydrothermal synergistic crystallization. According to the material, through a weak acid-medium strong acid synergistic acidic system and a porous structure, the problems that a traditional catalyst is insufficient in acid sites, mass transfer is blocked and carbon deposition is serious are solved, the initial conversion rate of naphtha is larger than 90%, the total yield of ethylene and propylene is larger than 52%, the carbon deposition amount is only 9.4% after circulation is conducted five times, the structure is stable, the preparation process is simple, and the material has industrial application potential.

The invention discloses an automatic cleaning device for coking at a tank opening of a calcining furnace, and belongs to the technical field of calcining furnace cleaning, the automatic cleaning device comprises a limiting mounting plate, a plurality of lifting through holes for releasing pressure are formed in the two ends of the limiting mounting plate, and a cleaning mechanism is arranged on one side of the limiting mounting plate; a fixing mechanism used for driving the cleaning mechanism to rotate and achieving the position adjusting effect on the cleaning mechanism is arranged on the side, facing the cleaning mechanism, of the limiting mounting plate, and the cleaning mechanism comprises a cleaning assembly used for achieving the cleaning effect and a transmission assembly used for achieving the transmission and shape adjusting effect on the cleaning assembly. The cleaning assembly is arranged at the end, away from the fixing mechanism, of the transmission assembly. Through mutual cooperation of multiple structures, the cleaning unit can realize range cleaning of the calcining furnace tank opening through rotation and height change, so that a user does not need to adjust the position of the cleaning device in the cleaning process, and the cleaning device is labor-saving in use and higher in cleaning efficiency.

A fluidized bed reactor system includes a fluidized bed reactor configured to receive an upwardly flowing heated light hydrocarbon feed stream and a heated regenerated catalyst at a temperature sufficient to crack the heated light hydrocarbon feed stream to produce a product effluent stream comprising hydrogen and a spent catalyst comprising coke deposits; a catalyst regeneration unit in operative connection with the bottom of the fluidized bed reactor, the catalyst regeneration unit configured to receive the spent catalyst flowing downward and to combust the coke deposit, to produce the heated regenerated catalyst and a heated gaseous effluent for producing the heated light hydrocarbon feed stream; and a riser externally connected to the fluidized bed reactor and the catalyst regeneration unit, the riser configured to receive the heated regenerated catalyst and a gas-based flow to cause the heated regenerated catalyst to flow upward to the fluidized bed reactor.

Systems and methods are provided for forming particles containing pyrolysis coke during a forced-circulation hydrocarbon pyrolysis process. The gaseous hydrocarbon pyrolysis configuration described herein provides reduced coke fouling of the pyrolysis system. This is achieved using a forced circulation reactor design to move circulating coke through the reactor system. The gaseous hydrocarbon pyrolysis configuration is proposed to prevent the undesirable operational affects that occur in reaction zones that do not contain solid particles by maintaining an amount of solid particles above a threshold solids density in areas of the system with pyrolysis conditions. The threshold solids density is a density at which carbon formed during the pyrolysis reaction will have increased selectivity for depositing on circulating solid (coke) particles, while reducing or minimizing coke deposition on system surfaces.

The invention discloses a TDI (toluene diisocynate) decoking process system and application thereof in a TDI production process. The TDI decoking process system comprises a decoking tower, a first circulating pump, a tower kettle reboiler and a wiped-film evaporator, the wiped-film evaporator is additionally arranged to retreat tower bottoms after decoking of the decoking tower, and the content of tar in the tower bottoms is reduced, so that the situation that the heat exchange effect of the heat exchanger is reduced due to coke deposits is avoided. The TDI decoking process system is applied to a TDI production process, and due to the improvement of the decoking process system, the overall operation stability is higher, and the service life is longer.

The application discloses a TDI decoking process system and application thereof in a TDI production process. The TDI decoking process system comprises a decoking tower, a first circulating pump, a tower kettle reboiler and a wiped film evaporator. The tower kettle liquid after decoking of the decoking tower is reprocessed through the added wiped film evaporator, so that the content of the coke in the tower kettle liquid is reduced, and therefore, the heat exchange effect of the heat exchanger caused by the coke deposit is avoided. The TDI decoking process system is applied to the TDI production process. Due to the improvement of the decoking process system, the overall operation stability is higher, and the service life is longer.

A catalyst regeneration gas loop is operated in a heat exchanger decoking mode. A regeneration gas is diverted away from a burn zone of the catalyst regeneration gas loop and to a heat exchanger, where coke deposits are disposed on a surface of the heat exchanger. The regeneration gas is prevented from flowing to an oxychlorination / calcination zone of the catalyst regeneration gas loop. Within the heat exchanger, the coke deposits are combusted with oxygen of the regeneration gas, thereby removing the coke deposits from the surface of the heat exchanger and producing carbon dioxide. Oxygen is replenished to the regeneration gas. The regeneration gas is recycled to the heat exchanger.

The application discloses an aluminum alloy surface crystalline nano-composite film layer and a preparation method thereof. The preparation method comprises the following steps: preparing a Cr plating layer on the surface of a substrate, then preparing a CrAlN plating layer on the Cr plating layer to obtain a substrate plated with a CrAlN film layer; and preparing a TiO2 plating layer on the surface of the substrate plated with the CrAlN film layer to form a nano-composite film layer on the surface of the aluminum alloy. The CrAlN plating layer provides structural support and oxidation resistance, and the crystalline TiO2 plating layer enhances the anti-coking ability and self-cleaning characteristics of the surface. The multilayer design can significantly improve the overall anti-coking effect and slow down the coke deposition rate.

The invention discloses an agent for preventing coking during dry distillation. The agent comprises the following components in percentage by mass: 5-30% of an organosilicon compound; 3-15% by mass of a metal salt coking inhibitor selected from one or more of an aluminum salt, a calcium salt, a magnesium salt and a zinc salt; 0.5-5% by mass of a nonionic surfactant; and 5-20% by mass of a sustained-release agent selected from a polymer sustained-release material. By adopting the composite formula of the organic silicon compound and the metal salt coke inhibitor, a synergistic effect can be achieved, and the coke generation probability is remarkably reduced. Especially at an extremely high temperature, the components can effectively interfere with a molecular structure formed by coke and reduce coke deposition and coking phenomena, so that the clean and efficient operation of equipment is effectively maintained, and the agent is suitable for various raw materials and different reaction conditions, can adapt to various dry distillation reaction systems such as low-rank coal, oil shale and waste tires, and has a wide application prospect. And the method is not limited by reaction raw materials or temperature.

Disclosed is a process that includes flowing a hydrocarbon material through a first tube bank disposed in a convection section of a pyrolysis furnace along a flow path of a flue gas generated in a radiant section of the pyrolysis furnace. The process further includes flowing the hydrocarbon material through a second tube bank disposed upstream of the first tube bank along the flow path of the flue gas. Then, the process include flowing the hydrocarbon material through a third tube bank disposed downstream of the second tube bank along the flow path of the flue gas. Flowing the hydrocarbon material through the second tube bank before the third tube bank may prevent coke deposition in areas of the convection where it is difficult to remove coke deposits.

The utility model discloses an EGR (Exhaust Gas Recirculation) valve with a sealing protection device, which relates to the technical field of EGR valves and comprises a valve body, a vacuum connecting pipe, a contraction mechanism arranged on the valve body, a central valve rod, an exhaust gas backflow space, a fixed plate, a rotating mechanism arranged on the fixed plate, a carbon scraping plate, an elastic sealing plug and a cooling component arranged on the valve body, through cooperation of a contraction mechanism, a center valve rod, a fixing plate, a rotating mechanism, a carbon scraping plate and an elastic sealing plug, when a waste gas inlet is opened or closed, the center valve rod drives the carbon scraping plate to rotate along the inner wall of the valve body through the rotating mechanism, the inner wall of the valve body is cleaned, soot particles are prevented from being deposited on the inner wall of the valve body, and the service life of the valve body is prolonged. Formation of coke deposits is prevented, so that complete closing of the valve is not hindered, and sealing failure is avoided; the gas entering the valve body is cooled through the cooling assembly, and the influence of the temperature on the elastic sealing plug is reduced, so that the service life is prolonged, and the sealing protection effect is achieved.