1382 results about "Fixed bed" patented technology

The invention relates to a preparation method of phenylmethylamine. The technical scheme adopted by the invention for mainly solving the problems of high catalyst loss, low production efficiency and high intermittent operation labor intensity is as follows: the preparation method of the phenylmethylamine comprises the following steps: mixing the raw material of cyanobenzene with a solvent material or at least one of one part of product materials in a mixing unit, introducing the mixture into a fixed bed hydrogenation reactor to be in contact with hydrogen and a catalyst and carry out multi-phase continuous hydrogenation reaction to obtain a product material containing phenylmethylamine, separating the product material to obtain a phenylmethylamine product, wherein the catalyst is a metal loaded catalyst; and the metal is selected from at least one of Pd, Pt, Cu, Ni, Mo and Fe. The preparation method can be used for preparing phenylmethylamine.

The invention discloses a method for preparing 12-mercaptan through solid organic acid catalysis, belongs to the technical field of 12-mercaptan preparation, and aims to solve the problems of low catalyst activity, harsh reaction conditions, serious pollution, high cost and dependence on import in the prior art. N-dodecanol and hydrogen sulfide are used as raw materials and are mixed according to the molar ratio of 1: 1.2-1: 1.3; the method comprises the following steps: gasifying n-dodecanol, mixing with purified hydrogen sulfide, preheating to 210-240 DEG C, introducing into a fixed bed reactor filled with a solid organic acid catalyst, and reacting at-0.08-3.0 MPa for 3.5-4 hours; and cooling and condensing the reaction product, carrying out gas-liquid separation, rectifying and purifying the liquid product to obtain 12-mercaptan with the purity of more than or equal to 99.5%, and recycling unreacted hydrogen sulfide. The solid organic acid can be a catalyst of p-toluenesulfonic acid and the like or mesoporous silica loaded nickel, cobalt and molybdenum metal oxides. The method has the advantages of high catalytic activity, mild reaction conditions, high product yield (the conversion rate of n-dodecanol is greater than or equal to 94.5%), environmental protection and low cost, can realize the domestic mass production of 12-mercaptan, and meets the market demand.

The invention provides a fixed bed reactor for preparing aromatic hydrocarbon through hydrogenation of carbon dioxide. The fixed bed reactor comprises a reaction cavity and a temperature control system, the reaction cavity comprises a rapid reaction section and a slow reaction section which are sequentially arranged in the material flow direction; the rapid reaction section is provided with a first heat exchange assembly, and the slow reaction section is provided with a second heat exchange assembly; the temperature control system comprises a first temperature adjusting unit and a second temperature adjusting unit, the first temperature adjusting unit is connected with the first heat exchange assembly, the second temperature adjusting unit is connected with the second heat exchange assembly, and the first temperature adjusting unit and the second temperature adjusting unit are independently connected with the central processing unit. The reactor provided by the invention adopts a multi-section design and global temperature linkage control, is suitable for a strong heat release rapid reaction process, and can effectively inhibit hot spots and improve aromatic hydrocarbon selectivity and catalyst stability.

The invention relates to a heterogeneous catalysis technology, and aims to provide a method for improving the yield of components of aviation kerosene prepared by ethylene oligomerization through combination of a fixed bed and a slurry bed. Comprising a fixed bed reactor and a slurry bed reactor which are sequentially connected in series, the fixed bed reactor is filled with a metal modified mesoporous zeolite molecular sieve catalyst, and the slurry bed reactor is filled with a mesoporous zeolite molecular sieve catalyst. The method comprises the following steps: firstly, carrying out ethylene oligomerization reaction in a fixed bed reactor to generate a product containing C4-C8 olefin; the reaction product is directly introduced into the fixed bed reactors connected in series for secondary reaction, and the final product comprises C5-C16 + liquid phase olefin as an aviation fuel component. By adopting a fixed bed-slurry bed reactor combined method, the ethylene conversion rate can be greatly improved; secondary oligomerization is carried out by using an acidic mesoporous zeolite molecular sieve catalyst, so that the selectivity of aviation kerosene components is improved; the mesoporous catalyst prepared by an alkali treatment method has a good diffusion effect and keeps high activity for a long time.

The invention belongs to the technical field of industrial waste heat resource utilization, and provides a hydrogen-fused salt energy storage coupled industrial waste heat recovery hydrogen production system and method, a fused salt energy storage subsystem comprises an energy storage module and a waste heat heat exchange module which are connected with each other, and a thermochemical circulation subsystem adopts a reactor; the reactor adopts a horizontal fixed bed reactor, and CaO-Ca (OH) 2 particles are filled in the reactor; a heat absorption stage: the high-temperature molten salt flows through a reactor jacket, a bed layer is heated to a first preset temperature, Ca (OH) 2 is subjected to a decomposition reaction, and nitrogen is introduced in the reaction process; a heat release stage: introducing water vapor into the reactor, carrying out hydration reaction on the water vapor and CaO, heating the fused salt to a second preset temperature by virtue of reaction heat release, and providing a heat source for the electrolytic hydrogen production subsystem; through coupling of a fused salt energy storage system and CaO-Ca (OH) 2 thermochemical circulation, efficient recovery and utilization of low-grade waste heat at the temperature of 300-500 DEG C are achieved, an electrolytic bath is driven to produce hydrogen at low cost, the heat efficiency of the system is improved to 75% or above, and green hydrogen self-supply in the high-energy-consumption industry is promoted.

The invention discloses a catalytic method for converting alpha-olefin in an alkane-olefin mixture into internal olefin and application, raw materials and a solid acid catalyst are carried out in a fixed bed or a reaction kettle, the reaction temperature is 50-150 DEG C, the reaction pressure is 15-400 psi, and the reaction environment is an inert gas atmosphere; when the reaction is carried out on the fixed bed, the mass space velocity of the solid acid catalyst is 1h <-1 >-20h <-1 >; when the reaction is carried out in the reaction kettle, the conversion frequency of the raw materials is 5000 mol substrate mol acid site density <-1 > h <-1 > to 50000 mol substrate mol acid site density <-1 > h <-1 >; wherein the raw material is an alkane-alkene mixture; the solid acid catalyst comprises an active component and a carrier, wherein the carrier contains at least one inorganic oxide; the active component has a structure as shown in a formula (1) and / or a formula (2), in the formula (1) and the formula (2), R is alkyl or phenyl, and n is greater than or equal to 1. According to the catalysis method provided by the invention, the conversion rate of alpha-olefin can be increased, and the proportion of skeleton isomerization products and oligomers in internal olefin products can be reduced.

The utility model provides an activated carbon waste gas treatment device which comprises a tank body, an activated carbon adsorption unit, an air distribution device, an air supply unit and a waste gas conveying unit, the interior of the tank body is divided into a plurality of independent adsorption subareas through longitudinal partition plates, the lower end of each subarea is provided with an air inlet branch pipe, and the top of each subarea is provided with an exhaust branch pipe which is communicated with an exhaust header pipe; the activated carbon adsorption unit is composed of layered activated carbon assemblies, the air distribution device achieves uniform distribution and independent control of airflow through an annular air supply / waste gas distribution header pipe and crotch-shaped partition distribution branch pipes, the air supply unit adjusts the air supply amount through a compression fan and a fourth flow meter, and the waste gas conveying unit controls waste gas input through an exhaust fan and a fifth flow meter. The device disclosed by the utility model is based on waste gas concentration and flow data, dynamically opens and closes partitions and adjusts air volume, realizes accurate matching of adsorption area and load, breaks through the efficiency bottleneck of a fixed bed, improves the utilization rate of activated carbon to 85-95%, reduces energy consumption by 15-20%, supports rapid partition switching and modular maintenance, and remarkably optimizes the operation and maintenance cost.

A fixed-bed reactor is provided for desulfurization, comprising an outlet collector located at a lower end section of the reactor and a lower baffle plate spaced apart from an upper section of the outlet collector. The fixed-bed reactor efficiently reduces the surface temperature of the outlet collector located at a lower end section of the reactor.

The invention discloses application of a supported heterogeneous catalyst of oxide and copper-manganese spinel in preparation of acetaldehyde by anaerobic dehydrogenation of ethanol, and belongs to the technical field of heterogeneous catalysis for preparation of acetaldehyde and hydrogen by anaerobic dehydrogenation of ethanol. The reaction is carried out in a fixed bed reactor, under the conditions that the reaction atmosphere is nitrogen, the reaction temperature is 280 DEG C and the mass space velocity is 66.1 h <-1 >, the ethanol conversion rate is 72.5%, the acetaldehyde selectivity is 95.0%, and the space time yield of acetaldehyde based on the copper-manganese composite oxide is 43.5 h <-1 >, so that high-selectivity preparation of acetaldehyde and hydrogen under relatively mild conditions is realized; the system has the remarkable advantages of simple catalyst preparation, high catalytic activity under the condition of high mass airspeed, high space-time yield of acetaldehyde, high atom utilization rate of the system, good stability and the like. The CuMnTi-1 catalyst can be stabilized for more than 70 hours, the CuMnTi-1 improves the utilization rate of copper and manganese, improves the catalytic performance, reduces the demand quantity of copper-manganese spinel in the reaction, and reduces the overall cost of catalyst preparation.

A new method for extracting lithium from salt lake brine, comprising the following steps: a salt lake old brine raw material, desorption liquid, low-magnesium water, and adsorption tail liquid pass through an old brine feeding pipe (2), a desorption liquid feeding pipe (4), a low-magnesium water top desorption liquid feeding pipe (3), and an adsorption tail liquid top desorption liquid feeding pipe (11), respectively, which are located above and below a rotary disc of a multi-way valve system (1); and after respectively entering corresponding adsorption columns (6) by means of a duct and channel within the multi-way valve system (1), the entire process procedure is completed from an adsorption tail liquid discharge pipe (7), a qualified desorption liquid discharge pipe (10), a lithium-containing old brine discharge pipe (8), and an adsorption tail liquid top desorption liquid discharge pipe (5); and the adsorption columns (6) are connected in series or in parallel by means of channels located in the multi-way valve system (1). The feature in which a multi-way valve device is simple and easy to operate is utilized, and in comparison with a fixed bed operating system, the utilization rate of lithium adsorbent may be increased by over 20%, the utilization efficiency of the lithium adsorbent may be increased by over 40%, and production costs may be reduced by 30-50%. Therefore, the stability of a qualified desorption liquid is improved, stable production is guaranteed, and year-round constant operation may be achieved.

This disclosure relates to methods of preparing a zeolite including heating the dry gel zeolite in a fixed bed reactor to form a zeolite.

The invention provides an efficient treatment method for VOC waste gas in semi-coke production, which comprises the following steps: when the type of a catalyst and reaction conditions are determined, performing low-temperature oxidation treatment on a high-concentration VOC intermediate product through a fixed bed reactor, and adjusting the reaction temperature in real time by adopting a temperature monitoring system to obtain a waste gas flow after preliminary decomposition; for the waste gas flow after optimization decomposition, calculating energy consumption and equipment operation parameters in the reaction process by adopting an energy consumption analysis algorithm, and adjusting a process integration scheme through an iterative optimization technology to obtain a process parameter combination under energy consumption control; and according to a process parameter combination under energy consumption control, analyzing a balance point of equipment investment and operation cost through a cost estimation model, and predicting economy of long-term operation by adopting a Monte Carlo simulation technology to obtain a final process optimization scheme.

The invention relates to a method for preparing a gasoline component and an aviation fuel component through ethylene oligomerization, which comprises the following steps: contacting an ethylene-containing raw material with a first catalyst to carry out a first oligomerization reaction to obtain a first oligomerization product; the first catalyst comprises an FER structure molecular sieve; contacting the first oligomerization product with a second catalyst filled in the fixed bed reactor to carry out a second oligomerization reaction so as to obtain a second oligomerization product; the second catalyst is a molecular sieve catalyst and / or an amorphous silica-alumina catalyst; carrying out gas-liquid separation on the second oligomerization product to obtain a gas product and a liquid product, and carrying out distillation separation on the liquid product to obtain a C5-C9 fraction and a C9 + fraction; according to the method provided by the invention, the ethylene conversion rate is high, and the yield of C9 < + > fraction in the liquid product can be obviously improved.

The invention belongs to the technical field of energy chemical industry and catalysis, and discloses a preparation method for preparing synthesis gas through iron-catalyzed methane dry reforming. According to the method, gamma-aluminum oxide is taken as a carrier, ferric nitrate is loaded by adopting an equivalent-volume impregnation method, an iron oxide catalyst is formed through drying and roasting, and metal iron active sites with high dispersity are obtained through hydrogen reduction. The reaction is carried out in a fixed bed reactor, the reaction temperature is controlled to be 650-700 DEG C, methane and carbon dioxide are mixed according to the volume ratio of 1: 1 and introduced into the reactor under the normal pressure condition, and efficient dry reforming is realized to generate synthesis gas. According to the method, the methane conversion rate can reach 85% or above, and the carbon dioxide conversion rate can reach 90% or above. Compared with the existing noble metal or nickel-based catalytic system, the catalyst disclosed by the invention has the advantages of cheap raw materials, simple and convenient preparation process, excellent carbon deposition resistance, capability of keeping high activity and stability at lower temperature, low energy consumption, low cost, strong environmental protection property and suitability for industrial amplification.

Methods and systems for converting a renewable fuel intermediate composition to finished transportation fuel are provided herein. In some examples, a renewable fuel intermediate composition is flowed over a first catalyst in a first reaction zone to generate a saturated, hydrodeoxygenated product. A liquid portion of the renewable fuel intermediate composition may be characterized as having more than about 70 wt % of the oxygen being within ketone groups. The saturated, hydrodeoxygenated product may be flowed over a second fixed-bed catalyst in a second reaction zone to generate a product including the finished transportation fuel.

The invention belongs to the technical field of sewage treatment equipment, and particularly relates to a high-spinning-state sulfur-ferrihydrite adsorption material for a fixed bed, a preparation method and fixed bed adsorption equipment. According to the high-spin-state sulfur-ferrihydrite adsorption material for the fixed bed, in the preparation process, through the weak field ligand effect of sulfur, a FeO6 octahedron of ferrihydrite is triggered to generate remarkable Taylor (Jahn-Teller) distortion, Fe < 3 + > is induced to be converted into a high-spin state, spin polarization is regulated and controlled, part of low-spin-state Fe < 3 + > ions are promoted to be converted into the high-spin state, and the high-spin-state sulfur-ferrihydrite adsorption material for the fixed bed is obtained. The high-spin-state sulfur-ferrihydrite is obtained, the affinity with phosphate is enhanced, and the phosphate adsorption performance of the ferrihydrite is improved at present; the high-spinning-state sulfur-ferrihydrite is filled into fixed bed adsorption equipment, so that pollution of wastewater and sewage discharge to natural water bodies such as underground water, rivers and oceans can be effectively reduced, and the phenomena of algae bloom and red tide are avoided.

The application discloses a zinc-containing high-concentration high-salt production wastewater resource utilization method of gliclazide, and relates to the technical field of wastewater, and comprises the following steps: mixing raw water and dilution water according to a proportion and adjusting a pH value, removing zinc ions in the mixed wastewater to obtain treated wastewater; the treated wastewater is introduced into a running branch of a fixed bed resin adsorption device at a preset flow rate, nitrogen heterocyclic organic matter is adsorbed and separated through a resin adsorption column, the COD value of effluent water is monitored, and when the COD value exceeds a set value, the treated wastewater is switched to a standby branch to be evaporated and concentrated to recover sodium chloride; saturated resin is regenerated by countercurrent regeneration with methanol, and methanol washing liquid and water washing liquid obtained through the regeneration are recovered through a rectifying column, and the methanol recovered at the top of the rectifying column is recycled for resin regeneration. The application solves the problems, such as unstable treatment effect, high operation cost and low resource recovery rate, which are commonly present in the prior art when treating the wastewater.

The invention provides a process for preparing high-purity lithium sulfide through layer interface induction strengthening, which comprises the following steps: dissolving lithium chloride and sodium sulfide in N-methyl pyrrolidone, and stirring to form uniform slurry; pumping the obtained slurry into a fixed bed reactor filled with a molybdenum disulfide catalyst layered module, and reacting to obtain turbid liquid; performing temperature-controlled crystallization on the turbid liquid, filtering and separating to obtain sodium chloride crystals; performing reduced pressure distillation on the filtrate to obtain a lithium sulfide crude product; and dissolving the lithium sulfide crude product in absolute ethyl alcohol for washing, and carrying out suction filtration and drying to obtain lithium sulfide. According to the method disclosed by the invention, fixed bed catalytic reaction and programmed cooling crystallization separation are integrated, and process parameters are optimized, so that the core pain points of high energy consumption, poor safety, difficulty in separation, easiness in catalyst deactivation and the like in a traditional method are successfully solved; a green closed loop of the whole process flow is realized, and a reliable technical path is provided for industrial production of the high-performance lithium sulfide material.

The invention discloses a thermal power generating unit deep peak regulation and combustion stabilization system and method coupled with fixed bed oxygen-enriched gasification, and relates to the technical field of thermal power generating unit intelligent control. The method comprises the following steps: S1, pre-constructing an AI model library containing a flame state recognition model and a unit load-gasification intensity linkage control model; s2, collecting an automatic power generation control load instruction, a multispectral flame image, unit operation parameters and gasification furnace operation parameter data in real time, and inputting a flame state recognition model to output a flame state and a stability index; s3, calling the linkage control model, and inputting real-time working condition data to calculate the calorific value compensation amount of the synthesis gas; s4, taking the flame stability index as feedback, correcting the feedforward control quantity through the model prediction controller, and dynamically adjusting the operation parameters of the gasification furnace; and S5, when an exit condition is met, an exit track is generated. Intelligent control over the thermal power generating unit is achieved, the operation cost is reduced, the flame monitoring precision and the control response speed are improved, and safe and economical operation of the unit is guaranteed.

The utility model discloses a gas-liquid fixed bed reactor which comprises a barrel, an upper tube plate, an upper sealing head arranged at the upper end of the barrel, a lower tube plate, a lower sealing head arranged at the lower end of the barrel and a reaction tube nest arranged between the upper tube plate and the lower tube plate, and a liquid separation groove is formed in the upper tube plate; the gas-liquid fixed bed reactor further comprises a flexible multi-point thermocouple, the flexible multi-point thermocouple comprises a detection section, a wire section and a junction box which are sequentially arranged, the detection section is inserted into the reaction tube nest from bottom to top, the junction box is located on the outer side of the lower end socket, one end of the wire section is connected with the detection section, and the other end of the wire section is connected with the junction box. And the other end passes through the lower sealing head and is connected with the junction box. The flexible multi-point thermocouple is utilized, the problem that the temperature measuring thermocouple cannot extend into the reaction tube nest from the upper sealing head due to the fact that a liquid distribution disc is arranged at the upper tube plate is solved, the detection section of the flexible multi-point thermocouple is inserted into the reaction tube nest from bottom to top, the detection section can directly make contact with a reaction medium, and the advantage of being accurate in measured value is achieved.

The invention discloses a method for producing hydrogen by using organic solid waste, and relates to the technical field of new energy. The method comprises the following steps: classifying the organic solid wastes, screening out organic matters and combustible substances, mixing the organic matters and the combustible substances, and crushing into a homogeneous material with the particle size of less than or equal to 50mm; drying the homogenized material to obtain a dried material of which the water content is less than or equal to 8%; feeding the dried material into a rotary kiln pyrolyzing furnace, mixing the dried material with a heat carrier in the rotary kiln pyrolyzing furnace, heating the dried material by flue gas through the cylinder wall of the rotary kiln pyrolyzing furnace and the heat carrier, and pyrolyzing the dried material at the pyrolyzing temperature of 450-750 DEG C to obtain oil gas and pyrolyzing slag; mixing the pyrolysis residues with a cosolvent, preparing a glass body in a gasification melting furnace, mixing oil gas with water vapor, and reacting in a fixed bed reactor to prepare synthesis gas; and preparing the synthesis gas into hydrogen. The pyrolysis efficiency is remarkably improved, fuel consumption is reduced, system energy consumption is correspondingly reduced, and low-temperature efficient pyrolysis is achieved.

The present application relates to a kind of self-regeneration fixed bed reaction system for multiphase catalytic reaction, belong to fixed bed technical field.The system includes shell assembly, reaction tank assembly, distribution disc assembly and regeneration connecting assembly.Shell is separated to form several sectors, each sector is equipped with reaction tank, and isolation chamber is formed between reaction tank.Regeneration connecting assembly includes upper and lower rotating disc connected by rotating shaft, and inert gas containing cavity is arranged in rotating disc and is communicated with isolation chamber.Driving mechanism rotates rotating disc, so that regeneration pipe is communicated with specific reaction tank and carries out on-line carbon burning regeneration.The present application realizes the continuous production mode of "multi-zone reaction, one area on-line regeneration" by rotating structure, cooperates with the unique scraping seal assembly and elastic buffer structure, solves the pain points such as fast coking of catalyst in high-temperature dehydrogenation and other reactions, frequent switching, easy to string gas and thermal stress damage, significantly improves the production efficiency, operating stability and heat energy utilization rate of device.

The invention provides a loess-based hydrogen sulfide adsorbent, a preparation method thereof and application of the loess-based hydrogen sulfide adsorbent in removal of hydrogen sulfide in natural gas. Loess with a specific substance content is taken as a raw material, the material is prepared through pretreatment, modification activation and extrusion molding, and modification activation comprises alkali activation, graphene oxide crosslinking and copper and zinc loading. According to the invention, specific loess is combined with a targeted modification and activation process, so that the porosity and the specific surface area are effectively improved, and a new active phase is formed and endowed with adsorption and catalytic oxidation effects. The prepared adsorbent has the remarkable advantages of low cost, high sulfur capacity, long penetration time, excellent regeneration performance and the like. In a medium-low-temperature dry desulfurization scene, HS (the concentration is reduced to 0.1 ppm or below) in natural gas can be efficiently removed, and the device is particularly suitable for small and medium-sized natural gas purification devices in various process scenes such as a fixed bed and a moving bed, and can also be expanded to various fields such as coal chemical industry, petrochemical industry, biogas purification, environmental protection and the like.

This invention provides a system and method for removing high and low boiling points in polysilicon production. The system includes a first distillation column comprising a top rectifying section, a bottom stripping section, and a separation section between the rectifying and stripping sections, all of which are sequentially interconnected. The separation section includes a pre-fractionation section and a main fractionation section arranged side-by-side but not interconnected. The main fractionation section includes, from top to bottom, a first main fractionation section and a second main fractionation section that are interconnected. The pre-fractionation section has a low-boiling material inlet, the stripping section has a bottom outlet, and the first main fractionation section has a first outlet. The outlet of the disproportionation fixed-bed reactor is connected to the low-boiling material inlet. The second distillation column has a high-boiling material inlet and a top outlet, and the bottom outlet of the stripping section is connected to the high-boiling material inlet. The first outlet and the top outlet of the second distillation column are respectively connected to an adsorption column.

A method for preparing ethylbenzene by using nanosheet molecular sieve as catalyst, the hydrogen type nanosheet molecular sieve is broken and loaded into a fixed bed reactor, benzene and ethanol are used as raw materials, nitrogen is used as carrier gas, the reaction is carried out at 280-350 DEG C and 0.1-1.0 MPa; the hydrogen type nanosheet molecular sieve is ZSM-5 molecular sieve, the length of b axis direction is 70-100 nm, the length ratio L b / L a is less than 0.40. The method for preparing ethylbenzene provided by the application can be directly used for catalyzing ethanol and benzene to prepare ethylbenzene without secondary treatment such as modification of acid, alkali and alkali metal and rare earth metal elements based on the special structure of the nanosheet molecular sieve with ultra-short b axis, can ensure that the product is desorbed and diffused from the surface of the catalyst in time, reduces the probability of deep reaction of the product molecules, realizes high selectivity of the product ethylbenzene, and reduces the cracking and other side reactions.

The application discloses a catalyst for preparing methylaniline and a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst is prepared by modifying an activated carbon carrier with zirconium, cerium or nickel, treating the carrier with high-temperature nitrogen, loading active components Pd and pH-responsive polymers, solving the problems of low dispersion of the active components, easy poisoning and activity attenuation, and having good pH responsiveness and environmental adaptability. The preparation method optimizes a carrier modification process, adopts an impregnation method combined with timed stirring, controls reaction parameters, improves catalyst performance, realizes high selectivity and high yield of methylaniline, and has the advantages of high selectivity of the catalyst for methylaniline, inhibition of side reactions, adoption of a fixed bed reactor, simplification of operation, reduction of safety hazards, efficient reaction at a lower reaction temperature and pressure, and reduction of energy consumption and production cost.

The invention belongs to the technical field of biomass gasification, and particularly relates to a preparation method of high-calorific-value biomass gas. The preparation method comprises the following steps: (1) performing pyrolysis reaction on a modified biomass raw material in a pyrolysis reactor to obtain pyrolysis gas and solid biochar; (2) enabling the pyrolysis gas and water vapor to flow into a fixed bed reactor filled with a catalyst layer in parallel from bottom to top, carrying out methanation reaction to obtain product gas, enabling the product gas to flow out from the top of the fixed bed reactor, dividing the product gas into three streams, namely product gas A, product gas B and product gas C, cooling the product gas A to 40-50 DEG C, returning the product gas A to the fixed bed reactor, and enabling the product gas B to flow into the fixed bed reactor; the product gas B directly returns to the fixed bed reactor, and the reaction gas C is cooled and then is collected as biomass fuel gas. According to the preparation method, the content of methane in the fuel gas and the calorific value of the fuel gas can be remarkably increased.

The application discloses a preparation method and application of a low-Cu-loading high-activity methanol reforming hydrogen production catalyst. The catalyst takes Al2O3 as a carrier, Cu as an active component, and Ce as an additive, is synthesized by a coprecipitation method in one step, and realizes the synergistic effect of the active metal, the additive and the carrier by precisely controlling the Cu loading to be 5-15%, the Ce doping amount to be 1-5%, and combining specific precipitation, calcination and reduction processes; the dispersion degree and the low-temperature catalytic performance of Cu are improved by using the redox electron regulation formed by CeO2 and Al2O3 and the strong metal carrier interaction. Without doping of noble metals, the raw material cost is reduced, meanwhile, the catalyst has excellent mechanical strength, the long-period reaction performance does not attenuate for 300 hours, is suitable for a fixed-bed reforming reactor, can be efficiently applied to a methanol steam reforming hydrogen production reaction, and has remarkable industrial application value.

The utility model discloses an improved activated carbon fixed bed device and relates to the technical field of water treatment. Comprising a plurality of perforated plates which are mounted in an activated carbon tank, and the perforated plates adopt a mode that edge holes are small and dense and central holes are large and sparse; according to the height-diameter ratio of the carbon tank, 0-2 layers of porous plates are added to the carbon tank with the height-diameter ratio larger than 2; 1-3 layers of perforated plates are additionally arranged for the steel plates with the height-diameter ratio of 1-2; if the height-diameter ratio is smaller than 1, a perforated plate mode is not suitable; water is guided to the center from the edge, so that the distribution of water flow is adjusted to be uniform, and activated carbon can be uniformly adsorbed; the number of the perforated plates is selectively increased according to the height-diameter ratio of the carbon tank, so that the uniformity of water flow in the carbon tank can be improved.

The utility model discloses a fixed bed reactor for continuous flow efficient catalytic hydrogenation, which comprises a reactor main tank body, and an upper partition plate, a plurality of middle partition plates and a lower partition plate are fixed in the reactor main tank body; a plurality of vertical reaction cylinders are inserted into the corresponding through holes of the upper partition plate, the middle partition plate and the lower partition plate, and the outer side walls of the vertical reaction cylinders are welded and fixed on the inner side walls of the corresponding through holes; the upper partition plate is located at the upper part of the reactor main tank body, the lower partition plate is located at the lower part of the reactor main tank body, and the middle partition plate is located at the reactor main tank body between the upper partition plate and the lower partition plate; in the continuous reaction process, heat exchange media with different temperatures or heat exchange media with the same temperature flow in the upper heat exchange cavity, the middle heat exchange cavity and the lower heat exchange cavity, so that the reaction temperature of each stage is controlled, the heat exchange effect is met, and the reaction effect can reach the optimal state.