31results about How to "Slow down the speed of coking" patented technology

The invention discloses a hydrogenation and refining method of gasoline with poor quality, comprising the following steps: the base oil of gasoline contacts and reacts with hydrogenation protective agent at low temperature; after reaction effluent is mixed with circulation oil, the mixture sequentially contacts and reacts with hydrogenation desilication solvent and hyrorefining catalyst at high temperature; the reaction product is cooled and separated to obtain hydrogen-rich gas and refined gasoline fraction; and parts of refined gasoline fraction serves as circulation oil to return to the outlet of a first hydrogenation reaction area. The method can handle coker gasoline with high content of sulphur, nitrogen and olefin, and refined gasoline fraction can satisfy charging requirements of reforming pre-hydrogenation devices and steam cracking ethene preparing devices. The method of the invention can effectively slow coking speed of heating furnace tubes, greatly lowers pressure drop generation frequency of a main hydrogenation reactor, improves the operating severity of the main hydrogenation reactor and retards the deactivation speed of catalyst at the bottom of a refined reactor.

The invention provides a system to prepare glycol, which comprises: an oxirane reaction system with a tube-row fixed bed reactor with the tube size within 40~50mm, an oxirane hydration reaction system, a glycol evaporation system with a multi-effect evaporator system in series and a heat exchanger with low-pressure steam as heat source, and a vacuum dewatering system with a pre-heater arranged in front of the tower to heat the feeding solution to or more than its bubble point temperature; Wherein, the reboiler in the evaporation system has tube plate as dual-face composite structure steel plate, basic material layer as carbon steel, tube side composite layer as Monel alloy, and shell side composite layer as stainless steel. This invention takes small land, needs low investment, solves effectively the corrosion protection and coking problems for device, and has well economic benefit.

The invention discloses a method for dewatering treatment in glycol preparation. Wherein, heating the concentrated glycol aqueous solution obtained from multi-effect evaporation system in a preheater to its bubble point or higher; in dewatering tower, taking dewater treatment. This invention solves the problems of reboiler coking, prolongs service lifetime, and can increase the tower load more than 30% by adding a little piece of devices.

The invention discloses a catalytic cracking and catalytic gasoline hydrogenation combined technological method. The method comprises: adjusting the operating conditions of a FCC (fluid catalytic cracking) device fractionating tower, conducting cutting pre-separation on FCC gasoline in the fractionating tower so as to obtain light fractions and heavy fractions; subjecting the light fractions to alkali-free deodorization, then letting the deodorized light fractions and thermocatalytic diesel oil enter a hydrogenation prefractionator together, thus obtaining light gasoline at the tower top and medium gasoline at a tower middle lateral line, mixing the medium gasoline with the heavy fractions, then passing the mixture through a hydrogenation protection reactor and a hydrodesulfurization reactor in order, and mixing the obtained refined product with the deodorized refined light gasoline so as to obtain a clean gasoline product. With the method provided in the invention, the equipment energy consumption is significantly reduced, the gasoline octane number loss is small, gasoline product quality can meet the quality requirement of a sulfur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises are improved.

The invention provides a method for producing aromatics and light oil by catalytic conversion of straight-run diesel oil. The method comprises the following steps: 1) performing pretreatment on straight-run diesel oil to remove basic nitrogen compounds to obtain straight-run diesel oil removed from basic nitrogen compounds; 2) adding transition metal ions to the straight-run diesel oil removed from basic nitrogen compounds The modified nanometer ZSM‑5 molecular sieve catalyst is used as a reaction catalyst to carry out a catalytic conversion reaction to obtain the aromatic hydrocarbons and light oil. In the present invention, the straight-run diesel oil from which basic nitrogen compounds have been removed is used as the reaction raw material, and the modified nanometer ZSM-5 molecular sieve is used as the catalyst to carry out the catalytic conversion reaction, the catalyst has high reactivity, the reaction is more sufficient, the conversion rate of diesel oil macromolecules is improved, and the target product of aromatic hydrocarbons is obtained. The yield is increased, the formation of dry gas by-products is suppressed, and the coking speed of the catalyst is slowed down to prolong the single-pass cycle.

The invention discloses a catalytic gasoline deep hydrodesulfurization method. The method comprises: adjusting the operating conditions of a catalytic device fractionating tower, adding a lateral line, adopting an appropriate cutting point to conduct cutting so as to obtain FCC (fluid catalytic cracking) gasoline light fractions at the tower top and FCC heavy fractions at the lateral line; subjecting FCC gasoline light fractions to alkali-free deodorization, and then separating light gasoline and medium gasoline through a hydrogenation prefractionator; and carrying out moderate selective hydrogenation on the medium gasoline, performing deep selective hydrogenation on the heavy gasoline, and mixing the obtained two parts of refined distillate oil with the light gasoline subjected to alkali-free deodorization, thus obtaining a clean gasoline product or a blending component. Compared with the existing catalytic gasoline hydrodesulfurization technologies, the method provided in the invention can significantly reduce equipment energy consumption, the gasoline octane number loss is small, the obtained gasoline product quality can meet the quality requirement for a sulfur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises are improved.

The invention discloses a catalytic cracking and catalytic gasoline hydrogenation combined process. The process comprises: adjusting the operating conditions of an FCC (fluid catalytic cracking) device fractionating tower, and conducting cutting pre-separation on FCC gasoline in the fractionating tower to obtain light fractions and heavy fractions; subjecting the light fractions to alkali-free deodorization, then leaving the light fractions and thermocatalytic diesel oil to enter a hydrogenation prefractionator together to separate light gasoline and medium gasoline; and making the medium gasoline pass a prehydrogenation reactor and a hydrodesulfurization reactor in order to perform moderate selective hydrogenation, subjecting the heavy fractions to deep selective hydrogenation, and mixing the two parts of refined distillate oil with the refined light gasoline so as to obtain a clean gasoline product or a blending component. According to the process provided in the invention, the equipment energy consumption is reduced significantly, the gasoline octane number loss is small, and the gasoline product quality can meet quality requirement for a sulphur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises can be improved.

The invention discloses a deep hydrodesulfurization method for catalytic gasoline. The method comprises: adjusting the operating conditions of a catalytic device fractionating tower, adding a lateral line, and adopting an appropriate cutting point to perform cutting so as to obtain light fractions at the tower top and heavy fractions at the lateral line; subjecting the light fractions to alkali-free deodorization, then passing the deodorized light fractions through a hydrogenation prefractionator to separate light gasoline and medium gasoline; and subjecting the separated medium gasoline and the heavy fractions to selective hydrogenation, and mixing the refined product with the light gasoline subjected to alkali-free deodorization, thus obtaining a clean gasoline product or a blending component. Compared with the existing catalytic gasoline hydrodesulfurization technologies, the method provided in the invention has the advantages that: the equipment energy consumption is significantly reduced, the gasoline octane number loss is small, the gasoline product quality can meet the quality requirement for a sulfur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises are improved.

The invention discloses a low-energy consumption catalytic gasoline hydrodesulfurization method. The method comprises: adjusting the operating conditions of a catalytic device fractionating tower, conducting pre-separation on FCC (fluid catalytic cracking) gasoline in the fractionating tower so as to obtain light fractions at the tower top and heavy fractions at a lateral line; subjecting mercaptan in the light fractions to hydroconversion into a heavy sulfide, leaving the treated light fractions to enter a hydrogenation prefractionator to fractionate light gasoline and medium gasoline; carrying out moderate selective hydrodesulfurization on the medium gasoline, performing deep selective hydrodesulfurization on the heavy gasoline, subjecting the obtained two refined products to gas stripping, and then mixing them with the light gasoline undergoing mercaptan hydroconversion, thus obtaining a clean gasoline product. Compared with the existing catalytic gasoline hydrodesulfurization technologies, the method provided in the invention can significantly reduce equipment energy consumption, the gasoline octane number loss is small, the obtained gasoline product quality can meet the quality requirement of a sulfur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises are improved obviously.

The invention discloses a method used for catalytic gasoline deep hydrodesulfurization. The method comprises following steps: catalytic gasoline is delivered into a prefrationation tower firstly; an appropriate separation point is adopted, light gasoline fraction and middle gasoline fraction are discharged through the top of the prefrationation tower, and heavy gasoline fraction is discharged through the bottom of the prefrationation tower; the light gasoline fraction and the middle gasoline fraction are subjected to alkali-free deodorization, and are delivered into a hydrogenation prefrationation tower so as to separate light gasoline and middle gasoline, wherein catalytic cracking hot diesel oil extracted from a main fractionate tower side line is also delivered into the hydrogenation prefrationation tower; separated middle gasoline and heavy gasoline are mixed, and are subjected to selective hydrogenation, and an obtained distillate is mixed with light gasoline obtained via alkali-free deodorization so as to obtain clean gasoline products. Compared with existing catalytic gasoline hydrodesulfurization method, the method and equipment of the invention is capable of reducing energy consumption greatly, octane value loss of the gasoline products is less, sulfur content of the gasoline products is less than 10<mu>g / g, and economic benefits of oil refining enterprises are improved.

A semi-regeneration catalytic reforming reaction system comprises at least one combined bed reactor and a fixed bed reactor connected with the combined bed reactors in series.Each combined bed reactor is formed by combination of a fixed bed and a tube nest type fixed bed catalyst bed, wherein in the tube nest type fixed bed catalyst bed, the outlet material flow of the follow-up fixed bed reactor makes indirect contact with the reaction material flow of the combined bed reactor and heat is provided.The invention further provides a catalytic reforming method adopting the system.The problem that the operation efficiency of a reforming reaction system is hard to improve due to the limitation of the regeneration period of a catalyst of a final reactor can be well solved, and the reforming reaction system is made to obtain higher operation benefits.

The invention provides a coking inhibitor capable of retarding the coking of a furnace tube, filler and a heat exchanger in the distillation process of waste oil and effectively prolonging the on-stream time. The coking inhibitor is fully utilized to soften coke blocks, inhibit condensation and polymerization of condensed aromatics, and prevent or reduce the formation of coking materials; after the product is added in the atmospheric and vacuum distillation process, an acid value is effectively reduced and acid corrosion of equipment is controlled; the coking speed is greatly reduced, and theon-stream time is prolonged, i.e., monthly maintenance is prolonged to three-month maintenance once, so that production days are increased, the input of maintenance cost is reduced and direct economicbenefits are brought for a factory.

The invention discloses a method for catalytic cracking of straight-run diesel oil. The method comprises the following steps: step 1, adding acidic substances to straight-run diesel oil to perform pretreatment for removing basic nitrogen compounds; step 2, adding ZSM-5 nanometer molecular sieve The catalyst is put into the reactor for pretreatment; step 3, after the pretreatment is completed, feed straight-run diesel oil and inert diluent gas into the reactor at the same time to carry out catalytic cracking reaction to generate low-carbon olefins; the acidic substance is diphosphoric acid One or two of the group consisting of sodium hydrogen phosphate and potassium dihydrogen phosphate, the amount of acidic substances added is 1%-5% of the mass of straight-run diesel oil; the inert diluent gas is composed of nitrogen, helium and argon One or more of the groups, the molar ratio of the straight-run diesel to the inert diluent gas is 1:0.1-1. The direct-flow diesel catalytic cracking method of the present invention can increase the conversion rate of diesel oil and the yield of low-carbon olefins, and can prolong the one-way cycle of the catalyst.

The invention discloses a catalytic gasoline hydrodesulfurization method. The method comprises: adjusting the operating conditions of a catalytic device fractionating tower, adding a lateral line, conducting cutting at an appropriate cutting temperature so as to obtain light fractions at the tower top and heavy fractions at the lateral line; subjecting the light fractions to an alkali extraction treatment, and then separating light gasoline and medium gasoline through a hydrogenation prefractionator; and carrying out moderate selective hydrodesulfurization on the medium gasoline, and carrying out deep selective hydrodesulfurization on the heavy gasoline, subjecting the obtained two refined products to gas stripping, and then mixing them with alkali extracted light gasoline, thus obtaining a clean gasoline product. Compared with the existing catalytic gasoline hydrodesulfurization technologies, the method provided in the invention can significantly reduce equipment energy consumption, the gasoline octane number loss is small, the obtained gasoline product quality can meet the quality requirement for a sulfur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises are substantially improved.

A method for hydrogenation refining of coking gasoline. The raw material oil is mixed with hydrogen and enters the hydrogenation protection reactor to contact with the hydrogenation protection agent. The reaction is carried out under low temperature conditions. The reactor reacts with the hydrorefining catalyst under high temperature conditions, and the reaction product is cooled and separated to obtain hydrogen-rich gas and refined gasoline fraction. The olefin content in the refined gasoline fraction is less than 1% by volume, the sulfur content is less than 300 μg / g, and the nitrogen content is less than 2 μg / g, all of which can meet the feed requirements of reforming prehydrogenation units and steam cracking ethylene units. The method can effectively delay the coking speed of the furnace tube of the heating furnace, greatly reduce the pressure drop generation frequency of the hydrogenation main reactor, and can increase the operating severity of the hydrogenation main reactor.

The invention relates to a novel household straw gasification furnace which comprises a pressure device, a flange used for fixing a screw rod, a deashing and decoking block device and a large furnace tooth, a small furnace tooth, a water circulation heating device and a gas-fired boiler of the water circulation heating device, wherein the structure of the pressure device is as follows: a sleeve is sleeved between a first bevel gear and the flange, the first bevel gear and the upper end of the pressure screw rod are fixedly connected, a second bevel gear is fixedly connected with one end of a rocker shaft, and the first bevel gear and the second bevel gear are mutually meshed; and a bearing is arranged behind the second bevel gear on the rocker shaft, the bearing is supported by a bearing base fixed on a furnace top cover, and the other end of the rocker shaft is connected with a rocker. The novel household straw gasification furnace provided by the invention has the advantages that the operation is more simple and convenient through each structure improvement and reconstruction, the using effect is more ideal and stabilized, the thermal efficiency is improved further, thereby also establishing a foundation for realizing automatization.