70results about How to "Uniform reaction temperature" patented technology

The invention provides a battery, comprising a cover plate, a shell, a battery cell and electrolyte. The battery cell and the electrolyte are sealed in the shell of the battery, and the cover plate is hermetically connected with the shell. The battery cell comprises a positive polar plate, a negative polar plate and a diaphragm arranged between the positive polar plate and the negative polar plate. A positive polar lug is arranged on the positive polar plate, and a negative polar lug is arranged on the negative polar plate. The battery cell is further internally provided with a positive polar current and heat conducting member and a negative polar current and heat conducting member, and the positive polar current and heat conducting member and the negative polar current and heat conducting member are mutually insulated. The positive polar current and heat conducting member and the positive polar lug are conducted; the negative polar current and heat conducting member and the negative polar lug are conducted; the positive polar current and heat conducting member and / or the negative polar current and heat conducting member penetrate(s) through the cover plate to leading out current. According to the invention, the internal heat of the battery cell can be reduced rapidly, substances on the polar plates can be prevented from further thermal reaction, and thus, the safety performance of the battery is increased. Meanwhile, the stability of the internal temperature of the battery cell is guaranteed, the cyclic performance and the like of the battery are improved. In addition, the temperature at all parts in the battery cell can be ensured to be consistent so as to eliminate temperature differences and make the reaction temperature of all parts of the polar plates consistent. Meanwhile, the current and heat conducting members can play roles of backbone and support to support the battery cell, and is beneficial to not only assembly but also winding of the battery cell.

Provided are slurry bubble column technology for preparing ethylene through acetylene hydrogenation and a device thereof. The slurry bubble column technology includes adding water and then catalyst into a reactor, filling inert gases for replacing, heating, leading gas mixture of acetylene and hydrogen to enter in the reactor for reacting from the bottom of the reactor through a gas distributor, finally exhausting reaction products and unreacted feed gases from the top of the reactor, and separating to obtain the ethylene. The unreacted feed gases and the feed gases are mixed and then enter the reactor again for reacting. The reactor comprises a reaction gas inlet at the bottom, the gas distributor and a material liquid exhaust port, a reactor barrel body is arranged on an expended section on the upper portion of a slurry bubble column reactor, and a catalyst feeding port and a gas outlet are arranged at the top of the reactor. The slurry bubble column for preparing the ethylene through the acetylene hydrogenation is simple in structure, overcomes the phenomenon of temperature runaway in a fixed bed reactor and improves the conversion rate and selectivity of the reaction, and the operation is easy to control.

The invention relates to the field of environmental engineering, in particular to sludge incineration technology. The sludge incinerator with no auxiliary fuel overcomes the disadvantage that sludge incineration in the prior art requires the auxiliary fuel such as coal. The sludge incinerator with no auxiliary fuel mainly comprises a boiling section, a suspension chamber, a spray pipe, a gas-guide pipe, a support arch, a slag outlet, a cooling spray nozzle, a combustor, an air chamber and a high-temperature air pre-heater, a slag cabin, a sand hoisting machine, a sand feeder, a middle cabin and a feeding machine. The sludge incinerator with no auxiliary fuel has the following advantages that: the incinerator adopting the technology can realize stable incineration of the sludge under the condition of not adding the coal so as to achieve innocent treatment of the sludge; the sludge incinerator using the technology can store a large amount of heat inside, and a bed has a uniform reaction temperature, so that partial overheat phenomenon is prevented and the temperature in the bed is easy to be controlled; the sludge incinerator is also safe for treating sludge containing a lot of volatile substances (such as oil-containing sludge); a fluidized bed has a simple structure, a low failure rate and a low construction cost, and is provided with a mechanical transmission component; the sludge incinerator can lower the coefficient of excess air and can reduce power consumption; the sludge incinerator has wide fuel adaptability so as to realize controlling harmful gases, such as SO2, NOx and the like easily and to obtain higher combustion efficiency; and ash produced by sludge incineration has a plurality of applications.

The invention provides a preparation method of ethyl acetate and / or isopropyl acetate. Catalytic dry gas from an oil refinery is used as a dilute ethylene and / or dilute propylene raw material and is introduced into a reaction system with a strong solid acidic catalyst to perform an addition esterification reaction so as to produce ethyl acetate and isopropyl acetate. The dry gas required by the method directly comes from a dry gas desulfurization treatment device of the refinery, the addition reaction pressure is low, continuous production of the ethyl acetate and isopropyl acetate can be realized by using dilute ethylene and / or dilute propylene, i.e., low-concentration ethylene and / or propylene, serving as raw material(s), the device investment is saved, the energy consumption is low, and the preparation method belongs to an advanced technology for new utilization of the catalytic dry gas.

The invention discloses a technological process for continuously producing succinic anhydride and co-producing succinic acid through maleic anhydride catalytic hydrogenation. The whole process comprises three steps, namely, reaction, rectification and hydrolysis, wherein two stages of hydrogenation reactors are used for reaction, a primary hydrogenation reactor is a fixed bed reactor with hydrogen entering from the lower part and reaction liquid exiting from the upper part, and a secondary hydrogenation reactor is a trickle bed reactor with hydrogen and reaction liquid entering from the upper part and exiting from the lower part. The technological process adopts an external circulating heat radiation manner, and reaction heat is uniformly removed, so that the average operation temperature of the whole reactor is effectively controlled, and the reaction temperature in the whole main reactor is balanced. Furthermore, the primary hydrogenation reactor adopts the manner that both the maleic anhydride solution and hydrogen flow upward simultaneously, so that the reaction temperature of the whole reactor is controlled to be balanced, local hot spot temperature is effectively controlled and lowered, and the reactants are prevented from polymerizing and depositing carbon or coking.

The invention relates to an oxidizing reaction device. The oxidizing reaction device comprises a reaction area, a gas-liquid distribution area and a material supporting member. The gas-liquid distribution area is arranged below the reaction area, and the material supporting member is used for supporting a reactant in a first cavity and arranged at the bottom end of the reaction area. The gas-liquid distribution area comprises a second cavity, a gas collection chamber, more than one gas distribution pipe and a ventilation opening, the gas collection chamber is arranged in the second cavity, one end of each gas distribution pipe is arranged at the peripheral edge of the gas collection chamber, and the ventilation opening is arranged below the gas collection chamber. At least one air hole is formed in each gas distribution pipe. By adopting the oxidizing reaction device, the gas, material liquid and temperature can be uniformly distributed in a reaction system, the reaction time is reduced, and the reaction speed is increased.

The CS2 reactor furnace includes inner furnace body of refractory material, outer furnace body of refractory material, and heating chamber between the inner surface body and the outer furnace body. In the peripheral of the inner surface body, there are sulfur gasifying furnace and carbon material preheating furnace, and the sulfur gasifying, furnace is connected via sulfur vapor duct to the bottom of the inner furnace body. The CS2 reactor furnace of the present invention has no sulfurizing and oxidizing corrosion of inner furnace body and thus long service life. The material preheating speeds the reaction and raise the product yield. Heating the coal-burning gas furnace via the main fire channel communicated with the furnace body can save fuel and stabilize furnace temperature.

The invention discloses an external circular reaction device suitable for hydrogenation exothermic reaction. The external circular reaction device mainly comprises a first-stage hydrogenation reactor, a second-stage hydrogenation reactor, a hydrogen circulation loop and a liquid circulation loop. The liquid circulation loop in the reaction device is used for mixing a part of reacted solution and a fresh raw material solution, so that the concentration of raw materials in the reactor is reduced, the bed temperature rise generated by a heat release effect caused by hydrogenation is relieved, and the temperature inside the first-stage hydrogenation reactor is effectively controlled. A way that the raw material solution and hydrogen flow up in parallel is adopted in the first-stage hydrogenation reactor, a liquid phase is used as a continuous phase, and a catalyst is soaked into a reaction liquid, so that the reaction temperature of a catalyst bed keeps constant, meanwhile, the overhigh local temperature of a reaction site on the surface of the catalyst is avoided, furthermore, the occurrence of polymerization reaction of organic matters on the surface of the catalyst is effectively inhibited, the carbon deposition quantity on the surface of the catalyst is low, and the service life of the catalyst is remarkably prolonged. The external circular reaction device disclosed by the invention is suitable for continuously producing succinic anhydride by using maleic anhydride through catalytic hydrogenation and preparing 1- 4-butanediol by using butynediol through hydrogenation.

This invention relates to new technology of gaseous phase catalytic esterification and its equipment, it uses straight immobilized bed reactor with fluidic apparatus. The invented new technology is low in cost, higher raw material gas space velocity, uniform mixing of raw material, can reduce channeling and short circuit effectively. The ethyl butylate yield and selectivity can reach respectively to 85.41% and 95.43%.

The invention provides a hydrogenation process for silicon tetrachloride and a process for preparing high-purity silicon from trichlorosilane. The process for preparing high-purity silicon from trichlorosilane comprises the following steps: (1) introducing trichlorosilane gas and hydrogen into a micro-channel mixing and heating device for heating and mixing so as to obtain a heated gas mixture; (2) conveying the heated gas mixture into a micro-channel reactor, heating the gas mixture and carrying out a reaction in the presence of a catalyst so as to obtain a reacted mixture; and (3) cooling the reacted mixture and carrying out solid-gas separation so as to obtain high-purity silicon and a cooled gas mixture, and separating and recycling each component in the cooled gas mixture. The invention also discloses a hydrogenation process for silicon tetrachloride. Compared with the prior art, the hydrogenation process for silicon tetrachloride and the process for preparing high-purity silicon from trichlorosilane in the invention have the beneficial effects that the conversion rates of silicon tetrachloride and trichlorosilane can reach 50% or above; and through combination of the processes with micro-chemical technology, the conversion rates are increased, security of the production processes is improved, and energy consumption is reduced.

The invention discloses a bipyramid rotary superconducting waste cracking furnace which is composed of a bipyramid superconducting isothermal rotary furnace body, a rotary furnace body driver, a heater and a feeding machine. The bipyramid rotary superconducting waste cracking furnace is characterized in that the bipyramid superconducting isothermal rotary furnace body is a bipyramid composite pipeisothermal superconducting rotary furnace body with two small ends and a thick middle composed of a metal inner pipe and a metal outer pipe which are concentric, the thick portion in the furnace bodyis a superconducting working medium heating pool, and a circumferential heating zone provided with heat exchange sheets is arranged on the periphery of the heating pool. The heater heats the furnacebody outside the furnace body through self-produced gas of the waste cracking furnace, produced radiant heat is rapidly and evenly transferred to waste in the rotary furnace through the circumferential heating zone, the heating pool and the bipyramid composite pipe isothermal superconducting rotary furnace body, and therefore the waste is rapidly and efficiently cracked and gasified. By means of the cracking furnace, the risk that bonding, bulging, blocking and coking are caused by local overheating of waste in the furnace is avoided, flue gas is prevented from being produced, pollution of harmful substances released by cracked materials to environment is avoided, dioxin emission is effectively restrained, and environment is protected; and cracked solid waste can be used as activated carbon for preparing chemical raw materials, and the overall economic benefits are obvious.

The invention discloses a hydrotreating method for heavy hydrocarbon raw materials. According to the invention, a fixed bed hydrogenation reactor is employed; at least two catalyst beds are arranged in the fixed bed hydrogenation reactor; a solvent is introduced at least from one gap formed by two adjacent catalyst beds and is mixed with reacting materials, and light components are extracted; the light components are introduced out from the reactor in an extraction and separation area between two adjacent catalyst beds, and heavy components enter into next catalyst bed for further reaction; extracted oil can directly enter into a gasoline / diesel hydrogenation device so as to obtain qualified gasoline / diesel and can also enter into an FCC main fractionating column for fractionation so as to obtain a crude product which enters into the gasoline / diesel hydrogenation device so as to obtain qualified gasoline / diesel. The method provided in the invention can effectively reduce pressure drop of beds in fixed bed hydrotreatment, prolong the service life of a catalyst, improve a total conversion rate of a fixed bed hydrogenation apparatus and enhance treating capacity of an apparatus under the condition of a same conversion rate, thereby creating greater benefits for an enterprise.

The invention provides a heterogeneous chain extension synthesis method for waterborne polyurethane. The method comprises the following steps: S1, pre-polymerizing: dehydrating polyester polyol, and performing a pre-polymerization reaction on the dehydrated polyester polyol and diisocyanate; S2, performing hydrophilic chain extension and cross-linking: adding a hydrophilic chain extender, a cross-linking agent and a diluent to a material obtained in step S1, and performing a chain extension and cross-linking reaction; S3, neutralizing and extending the chain: adding neutralizing amine, water,the diluent, a pH buffer agent and fatty amine to a material obtained in step S2, and ending the reaction to obtain a prepolymer; S4, performing dispersing emulsification: adding water to a material obtained in step S3 to achieve emulsification in order to uniformly disperse the prepolymer in water; and S5, performing a post-chain extension reaction: adding a post-chain extension amine to a material obtained in step S4, performing chain extension in water, and performing reduced pressure distillation to remove the solvent in order to obtain the waterborne polyurethane. The method uses fatty amine to carry out chain extension in a heterogeneous state in order to synthesize the waterborne polyurethane resin with high content of allophanate; and the obtained emulsion has the advantages of small micelle particle size, low viscosity, good leveling property and good storage performance.

The invention provides a separation system and method for carbon dioxide in a medium-high pressure air source. CO2 rich liquor from an absorption tower is subjected to pressure reduction and regenerated step by step in modes such as flash evaporation, high-pressure desorption and low-pressure desorption, the high-pressure characteristic of a CO2 air source is fully used, and input of external heatconsumption is reduced; the low-energy-consumption and low-cost requirements are met; high-temperature desorbed air of the tower top of a high-pressure desorption tower is introduced into a reboilerof a low-pressure desorption tower and used for a heating desorption heat source, external heat consumption required by the low-pressure desorption tower is reduced, and meanwhile the cooling-water consumption of a desorbed air cooler is reduced; barren liquor and semi-barren liquor from the high-pressure desorption tower and the low-pressure desorption tower enter from an upper-section filler anda lower-section filler of the absorption tower respectively, reaction temperatures at all portions of a tower body can be kept uniform, it is avoided that the local temperature is over high, and degradation and loss of an absorbent are reduced. According to the separation system and method for carbon dioxide in the medium-high pressure air source, the high-pressure characteristic of the CO2 air source is fully used, the input of the external heat consumption is reduced, and the low-energy-consumption and low-cost requirements are met.

The invention belongs to the field of clinical medical diagnosis and especially relates to a microballoon-based cup-type time resolution fluorescent procalcitonin analysis kit, a preparation method and an application thereof. The kit comprises a detection reaction cup, a fluorescence labeling antibody and a cleaning fluid. The method comprises the following steps of: in specific detection process, firstly drawing a standard curve; adding a to-be-detected sample into the detection reaction cup; adding the fluorescence labeling antibody; incubating at 30-40 DEG C; washing with the cleaning fluid and removing the uncombined antibody and fluorescence labeling antibody; and comparing a fluorescence signal with the standard curve, thereby acquiring the concentration of procalcitonin of the to-be-detected sample. The detection method for the procalcitonin is ultrahigh in sensitivity, so that the automatic operation can be easily realized; the reaction temperature is uniform; the method is not influenced by the environmental factor; the accuracy is better; the precision is excellent.

The invention discloses a production device of a RI-01 crude oil demulsifier. The production device mainly comprises an autoclave (D101), a reaction kettle (D102), and a mixing kettle (D103), whereinthe autoclave (D101) is connected with the mixing kettle (D103), the reaction kettle (D102) is connected with the mixing kettle (D103), and the autoclave (D101) has a nominal volume of 700-760 L.

The invention discloses a preparation process of succinic acid, which comprises the following steps: using maleic anhydride as a raw material; under the action of a microsphere catalyst, carrying out direct liquid-phase hydrogenation by using a slurry reactor to prepare succinic anhydride, and performing hydrolyzing to produce succinic acid, so that the reaction process is solvent-free, the energy consumption generated by separation is avoided, the materials are backmixed in the reactor, and external circulation heat removal is not required in the reaction process; meanwhile, a large amount of reaction liquid does not need to be circularly diluted, the reaction temperature is uniform, no hot spot exists in the reactor, and an over-temperature phenomenon does not occur even if the hydrogenation catalyst is applied to a strong exothermic reaction, so that the hydrogenation catalyst has good activity and stability, reaction materials do not need to be diluted by adopting a solvent, and energy consumption can be greatly reduced; in addition, no water is generated in the hydrogenation reaction process, no acid is generated through hydrolysis, and equipment does not need a special corrosion-resistant material.

The invention discloses a cup type time-resolved fluorescence D-dimer analysis method and a reagent kit based on microspheres. The method includes the steps that the inner surface of a detection reaction cup is coated with D-dimer monoclonal antibodies or polyclonal antibodies; the time-resolved fluorescence microspheres and the D-dimer monoclonal antibodies or polyclonal antibodies are subjected to covalent bond cross-linking to prepare fluorescence-labeled antibodies; a D-dimer sample to be detected is added into the coated detection reaction cup, then the fluorescence-labeled antibodies are added, and incubation is carried out at 25-40 DEG C; cleaning is carried out to remove unbound antigens and fluorescence-labeled antibodies, and fluorescence signals in the detection reaction cup are tested under the excitation of 340-380 nm exciting light; the fluorescence signals are compared with a standard curve, and the D-dimer concentration of the D-dimer sample to be detected is obtained. By means of the method, detection can be completed within a short detection time, the detection time is shortened, and the detection sensitivity is effectively improved.

Provided are slurry bubble column technology for preparing ethylene through acetylene hydrogenation and a device thereof. The slurry bubble column technology includes adding water and then catalyst into a reactor, filling inert gases for replacing, heating, leading gas mixture of acetylene and hydrogen to enter in the reactor for reacting from the bottom of the reactor through a gas distributor, finally exhausting reaction products and unreacted feed gases from the top of the reactor, and separating to obtain the ethylene. The unreacted feed gases and the feed gases are mixed and then enter the reactor again for reacting. The reactor comprises a reaction gas inlet at the bottom, the gas distributor and a material liquid exhaust port, a reactor barrel body is arranged on an expended section on the upper portion of a slurry bubble column reactor, and a catalyst feeding port and a gas outlet are arranged at the top of the reactor. The slurry bubble column for preparing the ethylene through the acetylene hydrogenation is simple in structure, overcomes the phenomenon of temperature runaway in a fixed bed reactor and improves the conversion rate and selectivity of the reaction, and the operation is easy to control.

A method for producing a particulate alumina composition includes the steps of preparing a wet particulate in a gas-liquid-solid three-phase system containing air by adding water and / or one or more compounds selected from an inorganic compound and an oxygen-containing organic compound to one or more alumina sources selected from an alumina hydrate and an alumina being rehydratable in the temperature range of 70 to 250° C., and to carry out a hydrothermal reaction in a temperature range of 70° C. to 250° C. Filtration and washing are carried out after the particulate alumina composition is preliminarily brought into contact with an alkaline component when an acid component is removed from the particulate alumina composition. The particulate alumina composition obtained by the method has a specific surface area in a dried product at 200° C. in the range of 40 to 300 m2 / g and contains crystalline boehmite having an aspect ratio of 10 or less.

A sputtering apparatus is provided. The sputtering apparatus comprises cooling water system having a temperature-controlling device for controlling the temperature of the sidewalls of the reaction chamber. During the deposition process of titanium / titanium nitride, the sidewall temperature of the chamber is controlled at about 50° C.˜70° C. for reducing the difference of temperature distribution in the chamber so that the reaction temperature within the reaction chamber can be rendered substantially uniform.

The invention discloses a reaction kettle for high-efficient chemical industry, wherein a rotor of a rotating motor is coaxially connected with a stirring rod located in the middle of an inner cavity of a reaction kettle body; the rotor of the rotating motor and the stirring rod are internally hollow and connected to each other; the outer part of the rotor opening of the rotor motor is further connected with a material extracting motor, and one side at the top part of the reaction kettle body is further vertically provided with a waste gas outlet; the outer part of the waste gas outlet is equipped with an absorbing cavity, and the outer part of the reaction kettle body is sleeved with a water bath tank; the bottom part of the water bath tank is equipped with a stirring motor, and the outer part of the stirring blade at the outer part of the rotor of the stirring motor is fixe with an electric heating bar. The reaction kettle for high-efficient chemical industry is heated through a water bath method, so that the reaction temperature can be more accurately controlled; besides, the drawing type fetching and discharging structures are arranged, so that the working efficiency is higher; an waste gas absorbing structure can improve the safety of the chemical industry reaction.

The invention belongs to the field of clinical medical diagnosis and especially relates to a microballoon-based cup-type time resolution fluorescent troponin I analysis kit as well as a preparation method and application thereof. The kit comprises a detection reaction cup, a fluorescence labeling antibody and a cleaning fluid. The method comprises the following steps of: in a specific detection process, firstly drawing a standard curve; adding a to-be-detected sample into the detection reaction cup; adding the fluorescence labeling antibody; incubating at 30-40 DEG C; washing with the cleaning fluid and removing the uncombined antibody and fluorescence labeling antibody; comparing a fluorescence signal with the standard curve, thereby acquiring the concentration of troponin I of the to-be-detected sample. The detection method for the troponin I is ultrahigh in sensitivity, so that the automatic operation can be easily realized; the reaction temperature is uniform; the method is not influenced by the environmental factor; the accuracy is better; the precision is excellent.

The invention discloses a method for synthesizing cinnamyl alcohol through selective hydrogenation of cinnamyl aldehyde. A tubular reactor is adopted, a small-particle solid special catalyst is arranged in the tubular reactor, the cinnamyl aldehyde and hydrogen are used as reaction raw materials, and the cinnamyl alcohol is synthesized by catalyzing the cinnamyl aldehyde to be selectively hydrogenated under the conditions that the reaction temperature is 50-120 DEG C and the reaction pressure of hydrogen is 0.5-5.0 MPa. Compared with the traditional kettle type, fixed bed and trickle bed reactors, the method provided by the method can obtain higher cinnamyl alcohol selectivity, cinnamyl alcohol yield and stability, and has better economic benefits.

The invention discloses a preparation method of ultrahigh-molecular-weight polyacrylamide. The preparation method comprises the following steps: (1) preparing an acrylamide aqueous solution; (2) adding the acrylamide aqueous solution into a reactor provided with a liquid internal heat conduction device, introducing water of 6-7 DEG C into a water filling nozzle of the liquid internal heat conduction device, starting a stirrer of the liquid internal heat conduction device, introducing nitrogen to remove oxygen, and adding an initiating agent to perform polymerization reaction, thereby preparing a polymerization product; and (3) cutting and granulating the polymerization product, and then adding the polymerization product into a hydrolyzer to perform hydrolysis reaction, thereby preparing ultrahigh-molecular-weight polyacrylamide. According to the preparation method disclosed by the invention, by adopting reasonable proportioning, combining corresponding process conditions and adopting the self-made liquid internal heat conduction device to uniformize the reaction temperature and stabilize the molecular weight of polyacrylamide, the molecular weight of prepared polyacrylamide reaches 3.4*10<7>.

The invention discloses a cup-type time-resolved fluorescent analysis method and kit for NT-proBNP based on microspheres. The method comprises the following steps: coating the interior surface of a detection reaction cup with a NT-proBNP monoclonal or polyclonal antibody; subjecting time-resolved fluorescent microspheres and the NT-proBNP monoclonal or polyclonal antibody to crosslinking via a covalent bond so as to prepare a fluorescence-labeled antibody; adding a to-be-detected NT-proBNP sample into the coated detection reaction cup, then adding the fluorescence-labeled antibody and carrying out incubation at 25 to 40 DEG C; carrying out cleaning to remove unbounded antigen and fluorescence-labeled antibody and testing a fluorescence signal in the detection reaction cup under the condition of excitation by exciting light with a wavelength of 340 to 380 nm; and comparing the fluorescence signal with a standard curve so as to obtain the concentration of NT-proBNP in the to-be-detected NT-proBNP sample. The method and kit provided by the invention can complete detection in short detection time, shortens detection time and improves detection sensitivity.

The invention relates to a hydrotreatment method of a heavy hydrocarbon raw material. The method adopts a fixed-bed hydrogenation reactor, which is provided with at least two catalyst bed layers inside. Between at least one adjacent catalyst bed layer, a liquid phase material is educed. The educed liquid phase material is mixed with a solvent, and then a light component is extracted. A light component-extracted heavy component is returned to the fixed-bed hydrogenation reactor so as to enter a next catalyst bed layer for continuous reaction. The extracted oil can directly enter a gasoline and diesel oil hydrogenation device so as to obtain qualified gasoline and diesel oil, or can enter a main fractionate tower of FCC (fluid catalytic cracking) for fractionation so as to obtain a crude product, which then enters a gasoline and diesel oil hydrogenation device so as to obtain qualified gasoline and diesel oil. The method of the invention not lonely can effectively reduce the pressure drop of a bed layer in subsequent hydrotreatment and prolong the service life of a catalyst, but also enhances the total conversion rate of a fixed-bed hydrogenation device simultaneously, or can improve the treatment capability of the device under a same conversion rate, as well as recovers part of light oil, thus being able to create greater benefits for enterprises.