32results about How to "Overcome coking" patented technology

The invention discloses a steam cracking method implemented in cracking equipment including a cracking furnace and a rapid-cooling device, the cracking furnace comprises a convection section and a radiation section, the method comprises the following steps: mixing an olefin, hydrogen and water vapor mixture with a liquid cracking feedstock, heating an obtained cracking feedstock mixture in the convection section for vaporization of the cracking feedstock mixture, heating up to the stretch-across temperature, adding the vaporized cracking feedstock mixture into the radiation section for first cracking reaction to obtain a first cracking reaction product; mixing an olefin-containing material flow with the first cracking reaction product at an outlet port of the radiation section for second cracking reaction to obtain a second cracking reaction product, and then injecting the second cracking reaction product into the rapid-cooling device for cooling and separating. According to the steam cracking method, coking of the olefin as a cracking feedstock in the convection section of the cracking furnace can be reduced, the cracking furnace operation can be long-term and stable, and the heat from high temperature cracking products of the radiation section can be effectively recovered.

The invention discloses a steam cracking method, and the method comprises the following steps: mixing water vapor with a liquid cracking feedstock, then heating in a convection section to the stretch-across temperature, and then entering into a radiation section for cracking reaction, and then injecting an obtained cracking reaction product into a rapid-cooling device for cooling and separating. The method also comprises at least one of the flowing to processes: before a heated cracking feedstock mixture is added into the radiation section, the heated cracking feedstock mixture is mixed with an olefin; and (2) before the cracking reaction product is injected into the rapid-cooling device, the cracking reaction product is contacted with the olefin for reaction. According to the steam cracking method, by addition of the olefin at the outlet port and / or the inlet port of the radiation section, coking in the convection section of a cracking furnace and the rapid-cooling device may not be produced, the heat from high temperature cracking products of the radiation section can be effectively used, and the yield of butadiene may be improved.

The invention belongs to the field of energy and environments, and particularly relates to a supercritical water heat combustion reactor for thick oil injection production. The supercritical water heat combustion reactor for thick oil injection production comprises a reaction chamber, an upper top cover and a lower bottom cover, wherein the reaction chamber is hollow, openings are formed in the upper end and the lower end of the reaction chamber respectively, the upper top cover is connected with the opening formed in the upper end of the reaction chamber in a sealed mode, the lower bottom cover is connected with the opening formed in the lower end of the reaction chamber, and a closed space is formed by the reaction chamber, the upper top cover and the lower bottom cover; a cylindrical stepped hollow portion is formed in the center of the upper top cover, a stepped hollow portion on the lower portion of the cylindrical stepped hollow portion serves as a combustor, a stepped hollow portion on the upper portion of the cylindrical stepped hollow portion serves as a communicated fuel inlet, an annular groove is formed in the outer side of the lower end of the stepped hollow portion on the upper portion of the cylindrical stepped hollow portion, the lower portion of the annular groove is communicated with the combustor, and the annular groove is communicated with an oxidizing agent inlet formed in the side face of the upper top cover; a mixing chamber is arranged at the bottom of the combustor, an annular gap formed between the upper top cover and the reaction chamber is formed in the side of the combustor, and the annular gap is communicated with a supplementary water inlet formed in the side face of the reaction chamber.

The invention discloses a steam cracking method, and the method comprises the following steps: mixing water vapor with a liquid cracking feedstock, heating an obtained cracking feedstock mixture in a convection section to the stretch-across temperature, and then adding the heated cracking feedstock mixture into a radiation section for cracking reaction, and then injecting an obtained cracking reaction product into a rapid-cooling device for cooling and separating. The method also comprises addition of a heated olefin or a heated olefin and water vapor mixture at an inlet port and / or an outlet port of the radiation section. According to the steam cracking method, by addition of the olefin at the outlet port and / or the inlet port of the radiation section, coking in the convection section of a cracking furnace and the rapid-cooling device may not be produced, the heat from high temperature cracking products of the radiation section can be effectively used, and the yield of butadiene may be improved.

A steam cracking method comprises the following steps: mixing a liquid cracking raw material with water steam, heating the above obtained cracking raw material mixture in a convection section to an across temperature, carrying out a cracking reaction, injecting the above obtained cracking reaction product into a quenching apparatus, and cooling and separating, wherein the method also comprises at least one of the following two processes: 1, the heated cracking raw material mixture is mixed with a material flow containing olefin before the heated cracking raw material mixture is added to a radiant section; and 2, the cracking reaction product contacts and reacts with the material flow containing olefin before the cracking reaction product is injected to the quenching apparatus. The method allows the material flow containing olefin to be introduced at the outlet and / or inlet of the radiant section, so coking generated in the convection section of a cracking furnace and in the quenching apparatus does not appear, the effective utilization of heat of high temperature cracking products from the radiant section can be realized, and the butadiene yield is improved.

The invention discloses a steam cracking method, and the method comprises the following steps: mixing water vapor with a liquid cracking feedstock, heating an obtained cracking feedstock mixture in a convection section to the stretch-across temperature, and then adding the heated cracking feedstock mixture into a radiation section for cracking reaction, and then injecting an obtained cracking reaction product into a rapid-cooling device for cooling and separating. The method also comprises introduction of an olefin, hydrogen and water vapor mixture at an inlet port of the convection section and / or the radiation section. According to the steam cracking method, in a steam cracking process, an olefin is introduced as a partial cracking feedstock, coking in the convection section of a cracking furnace and the rapid-cooling device may not be produced, the heat from high temperature cracking products of the radiation section can be effectively used, and the yield of butadiene may be improved.

The invention pertains to forward and backward wall opposed firing type utility boiler combustion chamber and method for arranging air nozzle on its side. The combustion chamber comprises a pulverized coal burner, forward and backward walls of combustion chamber of combustion wind combustor group, and a combustion chamber body arranged with air nozzle group including two-sided wall, and a combustion chamber hopper at lower part of the combustion chamber body. The method arranging air nozzle on its side is to arrange 1-6 row of air nozzles above the intersecting line of lowest pulverized coal burner shaft cross section and two-sided wall, and symmetrical with side wall centre line. By arranging a nozzle cluster capable of supplying axial flow air and side flow air to the combustion chamberon two-sided walls at same time, the invention can reduce side wall temperature at same time of improving oxygen compensation strength and boiler thermal efficiency, can effectively prevent the two-sided walls from severe coking and high-temperature corrosion, can reduce examination and repair amount of work of combustion chamber and can prolong service-life. The invention overcomes disadvantagesof low combustion efficiency, severe coking and high-temperature corrosion of the two-sided walls in background art.

The invention discloses an active control mechanism for broadening a lean burn flameout boundary of a combustion chamber of a heavy duty gas turbine. The active control mechanism comprises an oil supply system, an oil pump, an overflow valve, an elastic element, a nozzle, a backpressure valve, a connecting rod, a sleeve and an axial cyclone. The elastic element comprises two spring tubes which are arranged in parallel and a closed cavity, and the tail ends of the spring tubes are communicated with the closed cavity to form a free end of the elastic element. The oil pump is communicated with the oil supply system and is respectively connected with the inlet ends of the nozzle and the overflow valve; an overflow port of the overflow valve and the outlet end of the backpressure valve are communicated with the oil supply system; the inlet end of the elastic element is connected with the outlet end of the overflow valve; the outlet end of the elastic element is connected with the inlet end of the backpressure valve; the free end of the elastic element is hinged with the connecting rod; and the connecting rod is hinged with the sleeve. According to the active control mechanism, the lean burn flameout boundary of the combustion chamber of the heavy duty gas turbine is effectively broadened, the phenomenon of coking and carbon deposition due to immobilization of fuel in the single spring tube can be solved, and the service life of the control mechanism is prolonged.