109results about How to "Extended operating cycle" patented technology

The invention relates to the technical field of wastewater treatment, in particular to a hydrolytic acidification wastewater treatment process for strengthening extracellular electron transfer, which comprises the following steps: S1, constructing a hydrolytic acidification reactor, taking carbon fiber suspension filler as an anode, taking a steel wire mesh frame as a cathode, connecting the carbon fiber suspension filler in series by a stainless steel wire rope, and taking the stainless steel wire rope as a cathode; the carbon fiber suspension filler is connected with the steel wire mesh frame through an electrochemical workstation; s2, inoculating hydrolytic acidification bacteria into a reactor, controlling culture conditions, and domesticating microorganisms in a micro-current environment until a biological membrane is formed on the carbon fiber suspension filler; s3, inputting wastewater to be treated into the reactor, controlling treatment conditions, monitoring an effluent result, and discharging after the effluent result reaches the standard. Compared with traditional interspecific electron transfer, the wastewater treatment method has higher efficiency and speed, the oxygenolysis process of organic matter is accelerated, and the overall efficiency of wastewater treatment is improved.

The invention relates to the technical field of fault detection, in particular to an intelligent fault detection and diagnosis method and system, and the method comprises the following steps: extracting and classifying fault feature vectors item by item based on the normal state and abnormal state operation data of a vehicle, transmitting the fault feature vectors to a fault coding layer through coding, inputting a potential space, and carrying out the clustering of feature points, and obtaining a preliminary fault identification feature. According to the method, the accuracy and the efficiency of fault diagnosis are remarkably improved by refining fault feature extraction and expanding sample analysis, and the accuracy and the efficiency of fault diagnosis are remarkably improved by analyzing normal and abnormal state data, extracting fine fault feature vectors, performing preliminary identification by utilizing a clustering technology, further expanding a sample set by simulating samples and deepening fault mode learning. And graded fault detection is introduced, response is adjusted according to fault severity, early warning is realized through dynamic monitoring, the equipment operation period is effectively prolonged, the shutdown risk is reduced, the maintenance cost is saved, and the system reliability is improved.

The invention provides a sulfate-containing waste liquid treatment system and a sulfate-containing waste liquid treatment method for acrylonitrile and a combination device thereof, the system comprises at least two sets of waste liquid treatment units and a set of flue gas treatment unit, sulfate waste liquid is divided into two strands to enter the two sets of waste liquid treatment units for combustion, waste heat utilization and quenching purification, the discharged sulfur-containing flue gas is collected and enters a set of flue gas treatment unit, the sulfur-containing flue gas subjected to deep cooling, demisting and drying can be directly used for producing high-purity sulfuric acid, and a two-end and one-tail mode is adopted, so that the operation flexibility of the system is improved, and the treatment pressure is reduced. In the waste liquid treatment unit, a high-temperature reaction device adopts segmented air distribution, so that sufficient combustion of waste liquid is ensured, and SO2 loss is reduced; a special temperature field and structural design in the waste heat boiler can prevent the heat exchange device from scaling and blocking; a venturi scrubber is adopted in the quenching purification device to quench the flue gas, and a protective liquid film is formed on the contact interface of the high-temperature flue gas and a liquid phase, so that the temperature of equipment is effectively reduced, and corrosion of the high-temperature flue gas is prevented.

The invention relates to the technical field of path planning, and discloses a trajectory path planning system for automation equipment, which is characterized in that map data is acquired through a map establishment module, and is processed and analyzed to establish a map model; the path planning module generates a path planning strategy based on the map model, the equipment initial position and the supply point; the motion control module generates a motion control instruction according to the result of the path planning strategy to control the automation equipment; the safety monitoring module continuously monitors the terrain environment, obstacles and equipment states, and evaluates the safety of the motion control instruction in real time; and when the motion control instruction is not safe, the dynamic adjustment module generates a correction signal and adjusts the motion control instruction, so that autonomous positioning, path planning, safe navigation and dynamic adjustment of the automation equipment in a complex environment are realized, the operation efficiency of the automation equipment is improved, the operation safety is guaranteed, and the adaptive capacity of the automation equipment is improved.

The invention belongs to the technical field of entrained-flow bed coal gasification processes, and particularly relates to an entrained-flow bed coal gasification grey water quality optimization method which comprises the following steps: (1) performing multi-stage flash evaporation on black water to be treated to obtain multi-stage concentrated black water; (2) adding a flocculating agent into the multi-stage concentrated black water to settle, and enabling the obtained supernatant liquid as overflow grey water to enter a filtration-adsorption system; (3) preparing a filter aid mixed solution in advance; before the filter is put into use, the filter aid mixed solution is introduced into the filter for precoating, and after precoating and filtering, the filter aid forms a filter aid filtering base layer on filter cloth of the filter; after the pre-coating process of the filter aid is finished, the overflow grey water is introduced into a filter for filtration-adsorption treatment; and (4) adding a dispersing agent into the obtained ash water filtrate to prepare recycled ash water, and feeding the recycled ash water into a washing tower and a gasification furnace for cyclic utilization. The method can effectively improve the water quality of the recycled grey water under the condition of reducing the dosage of the flocculating agent and the dispersing agent, and prolongs the operation period of a water system.

The invention discloses a built-in heat exchange double fluidized bed reaction device, which is used for a biomass raw material hydrogen production process, and comprises: a gasification chamber, which is of a cylindrical structure and is provided with a conical surface at the bottom, and the conical surface is provided with a hole for introducing bubbling fluidizing air; the combustion chamber is of a tubular structure and is arranged in the gasification chamber in a sleeved mode, the bottom of the combustion chamber is in an open state, and the combustion chamber is arranged in the conical surface area and used for introducing vertically-upward combustion-supporting air; the material returning units are arranged at the upper part of the reaction device, are uniformly arranged along the circumferential direction and are used for carrying the high-temperature bed material particles from the combustion chamber to an annular gasification area outside the combustion chamber and mixing the high-temperature bed material particles with biomass raw materials in the gasification area to produce hydrogen; the material returning unit is provided with a loosening chamber and a material returning chamber, and a bottom plate of the loosening chamber is obliquely arranged towards the material returning chamber. Through the built-in design of the double fluidized beds, the feeding pipe and the return feeder are prevented from being exposed at room temperature, and the heat loss of the reactor is reduced; and meanwhile, the device can provide enough regeneration time for the bed material under the condition of keeping a relatively high solid conveying rate.

The invention relates to the technical field of crude oil cracking, and discloses a method and system for preparing low-carbon olefin and application, and the method comprises the following steps: (1) vaporizing raw oil to obtain a gas phase and a liquid phase; (2) carrying out supercritical extraction and sedimentation on the liquid phase to obtain extracted oil, settled oil and asphalt; (3) performing microwave cracking on the gas phase, the extract oil and water vapor in the presence of an electromagnetic wave absorber to obtain microwave cracking gas; (4) performing catalytic cracking on the settled oil to obtain catalyst cracking gas; and (5) separating the microwave cracking gas and / or the catalytic cracking gas to obtain the low-carbon olefin. According to the present invention, microwave cracking is adopted, and is matched with the supercritical extraction unit and the catalytic cracking unit, such that the problem of easy coking during the cracking reaction of the heavy cracking raw material can be effectively solved, the high low-carbon olefin yield can be obtained, and the operation period can be prolonged.

The invention relates to a molecular sieve catalyst as well as a preparation method and application thereof, and the preparation method of the molecular sieve catalyst comprises the following steps: (1) obtaining an all-silicon Silicate-1 molecular sieve; (2) preparing the molecular sieve catalyst: S1, uniformly mixing an all-silicon Silicate-1 molecular sieve with a silicon source, alkali, a template agent, water, a Pt source and an auxiliary agent, and aging under a negative pressure condition; s2, heating under a microwave induction condition for crystallization, and then washing, drying and roasting to obtain the molecular sieve catalyst. The prepared catalyst shows excellent stability and carbon deposition resistance and higher propylene product selectivity in a reaction for preparing propylene through propane dehydrogenation, and the catalyst is beneficial for prolonging the operation cycle of a device and reducing the unit consumption of the reaction.

The invention discloses a method for reducing carbon and alkali accumulation in a process of producing aluminum oxide by a Bayer process, which comprises the following steps of: feeding strong alkali liquor filtered by a salt discharging machine into a strong alkali tank through a first pipeline assembly, and feeding strong alkali liquor overflowing from a salt settling tank into the strong alkali tank through a second pipeline assembly; the middle of the strong alkali tank in the depth direction is connected with the circulating mother liquor blending tank through a strong alkali liquor conveying pipeline assembly, the bottom of the strong alkali tank is connected with the salt settling tank through an underflow conveying pipeline assembly, and the bottom of the salt settling tank is connected with the salt discharging machine through a salt discharging pipeline assembly; the invention also discloses a system for reducing carbon alkali accumulation in the process of producing alumina by the Bayer process, strong alkali liquor in the middle of the depth direction of the strong alkali tank is clear, and is conveyed to the circulating mother liquor blending tank through the strong alkali liquor conveying pipeline assembly for adjusting the circulating mother liquor, so that sodium carbonate returned to the process of producing alumina by the Bayer process is obviously reduced; the problems of high solid content and unsmooth alkali supplement caused by sodium carbonate are avoided, and the concentration of the circulating mother liquor meets the requirement.

The invention discloses a detachable traceless silicone rubber creepage-increasing umbrella skirt and processing equipment and a processing technology thereof, and belongs to the technical field of electric insulation accessory processing, the detachable traceless silicone rubber creepage-increasing umbrella skirt specifically comprises an umbrella skirt body, a mounting hole matched with an insulation plate is formed in the middle of the umbrella skirt body, and an interlocking opening communicated with the mounting hole is formed in the umbrella skirt body in the radial direction of the umbrella skirt body; the interlocking opening can realize autonomous closing and locking, and the closed umbrella skirt body forms a complete closed-loop structure; according to the invention, through the arrangement of the interlocking opening, the umbrella skirt body is directly sleeved into the insulating plate and then the interlocking part is buckled during installation, the umbrella skirt body is separated by hands during disassembly, tools are not needed, adhesive residues are avoided, mechanical damage is avoided, detachable traceless installation is truly realized, the insulating plate body is not damaged, and the later maintenance and replacement efficiency is greatly improved.

This invention relates to the field of petrochemical technology, specifically to a method and system for dehydrogenating low-carbon alkanes to olefins. The method includes: (1) introducing low-carbon alkanes into a moving bed reaction zone packed with a dehydrogenation catalyst to undergo a dehydrogenation reaction, obtaining dehydrogenation products, and separating the dehydrogenation products to obtain hydrogen, olefins, and alkanes; (2) introducing the spent catalyst flowing out from the bottom of the moving bed reaction zone into a regenerator for regeneration treatment to obtain a regenerated catalyst, and recycling the regenerated catalyst back to the moving bed reaction zone to participate in the dehydrogenation reaction. Using the method provided by this invention, the conversion rate of low-carbon alkanes can be improved, continuous catalyst circulation can be achieved, and the operating cycle of the unit can be extended.

Embodiments of the present application provide a method and apparatus for generating optimized parameters. The method is suitable for generating optimized parameters related to solder paste printing in surface mount technology. In the method, a cluster parameter model is used to determine whether at least one input parameter deviates from at least one parameter cluster. A global parameter model is used to determine the printing result of a plurality of target parameters in the input parameter. A heuristic algorithm is used to select at least one candidate parameter from the target parameters. An individual parameter model is used to modify the candidate parameter. As a result, the optimized parameters with high operation cycle and low failure rate can be obtained.

This invention discloses a high-gravity oil-solid separation device and method. The device comprises two parts: high-gravity separation and membrane filtration separation. The high-gravity separation part includes a device body, an oil slurry inlet, a diluent inlet, a pipeline mixer, a rotating shaft, a liquid distributor, separation components, a slurry enrichment plate, a heavy phase outlet, a centrifugal pump, a light phase outlet, a motor, and a nitrogen inlet. The membrane filtration separation part includes pipelines and sliding baffles, with the pipelines divided into membrane filtration pipelines and diluent inlet pipelines. This invention first discharges most solid particles through high-gravity separation, and then uses membrane filtration separation to improve the solidification effect, overcoming the limitations of a single separation mode, enhancing the separation effect and long-term operational stability, while simplifying the process flow and saving floor space.

The application discloses a method for sealing coke oven door frame channeling by grouting, which comprises the following steps: firstly, observing the channeling of the coke oven door frame to be repaired, judging the gap state between the coke oven door frame and the protection plate, and determining the channeling position; secondly, removing the T-shaped bolts of the fixed pressing plates adjacent to the upper part and the lower part of the channeling position, and completely covering the channeling position between the upper and lower pressing plates; thirdly, cleaning the installation hole after the T-shaped bolts are removed; fourthly, installing the grouting sealing plate with a grouting pipe and a drainage pipe in the T-shaped bolt installation hole of the upper part and the lower part of the channeling position; fifthly, using a grouting machine to press the sealing grouting material into the gap between the coke oven door frame to be repaired and the protection plate through the grouting pipe in batches until the grouting pipe discharges the grouting material; and finally, completing the sealing grouting of the coke oven door frame channeling. The method overcomes the defects of the traditional coke oven door frame channeling maintenance, reduces the influence on the normal production of the coke oven, avoids damaging the carbonization chamber masonry, improves the maintenance effect and efficiency, reduces environmental pollution, ensures the normal and reliable operation of the coke oven, and prolongs the operation cycle.

The utility model discloses a multilayer combined filter structure of desulfurization dust remover, including tower body, at least one layer composite filler layer is arranged in the tower body, the composite filler layer is multilayer structure, and the regular shaped filler area, transition flow guide area, bulk packing area and support grating from top to bottom include successively, the regular shaped filler area and bulk packing area outside all are provided with fixed frame, the regular shaped filler area and bulk packing area are filled in the corresponding fixed frame respectively, through the high specific surface area of bulk packing, can effectively strengthen gas liquid contact in bulk packing area, improve mass transfer rate, and the low resistance characteristic of regular shaped filler can avoid partial pressure drop surge in regular shaped filler area, realizes the balance of desulfurization efficiency and energy consumption, reduces operating energy consumption while guaranteeing desulfurization effect.

The invention relates to the technical field of crude oil cracking, and discloses a method and a system for preparing low-carbon olefin by utilizing microwave cracking and catalytic cracking and application, the method comprises the following steps: fractionating raw oil to obtain a gas phase fraction and a liquid phase fraction; under the condition of microwave cracking, mixing the gas-phase fraction with first water vapor, and then carrying out first contact with an electromagnetic wave absorber; carrying out second contact on the liquid-phase fraction and a catalyst under a catalytic cracking condition; and separating the first contact product and / or the second contact product to obtain the low-carbon olefin. According to the method, microwave cracking is adopted and is matched with fractionation and catalytic cracking, so that the problem that a heavy cracking raw material is easy to coke during cracking reaction can be effectively solved, the yield of low-carbon olefin is increased, and the operation period is prolonged.

The invention discloses a process method for selective deep desulfurization and denitrification of aromatic-rich fractions. The process method comprises the following steps: (1) mixing aromatic-rich diesel oil with hydrogen, and then feeding the mixture into a pre-hydrogenation reaction zone I for pre-hydrogenation dealkene reaction; (2) a product obtained in the step (1) enters a hydrofining reaction zone II for a hydrofining desulfurization and denitrification reaction; (3) carrying out flash evaporation on the product obtained in the step (2) to separate recycle hydrogen, enabling the obtained refined diesel oil to enter a moving bed adsorption denitrification reaction zone III, and carrying out deep adsorption denitrification reaction on the refined diesel oil under the action of an adsorption denitrification agent to obtain a desulfurized and denitrified refined aromatic-rich diesel oil component; and (4) enabling the inactivated adsorption denitrification agent in the step (3) to enter an adsorbent regeneration area IV, and completing reduction and drying of the inactivated adsorption denitrification agent under the action of a desorption agent to obtain the cyclically regenerated adsorption denitrification agent. According to the process method, deep removal of the sulfur-containing nitrogen-containing compound can be realized, and the investment cost is also greatly reduced.

The utility model relates to the technical field of bag-type dust removers, and discloses a bag-type dust removal connecting structure which comprises a first connecting ring, two connecting blocks are fixedly connected to the inner wall of the first connecting ring, an expansion ring is fixedly connected to the left side of the first connecting ring, and a convex ring is fixedly connected to the left side of the first connecting ring. A second connecting ring is detachably connected to the left side of the first connecting ring, a sealing groove is formed in the second connecting ring, a plurality of first springs are fixedly connected to the inner wall of the sealing groove, sealing rings are fixedly connected to the right sides of the first springs, and a clamping ring is fixedly connected to the interior of the second connecting ring. According to the utility model, dust-containing gas can be effectively prevented from escaping, the clean and safe working environment is guaranteed, the harm of dust to the health of personnel and the surrounding environment is greatly reduced, the stable airflow and pressure environment in the bag-type dust collector can be maintained, the efficient development of dust collection operation is ensured, and the reliable operation cycle and the service life of equipment are prolonged in an assisting manner.

The invention discloses MDA and a processing method thereof for phosgenation production of MDI. HCl gas is used to strip raw material MDA, so that the oxidation products (quinones, imines) in MDA can quickly undergo condensation reaction with MDA, and the oxidation products (quinones, imines) in MDA are reduced. The mass ratio of HCl stripping amount to raw material MDA is (0.02-0.1):1, and the stripping time is 1-30min. At the same time, negative pressure distillation dehydration is used to deeply remove the moisture generated by the reaction, reduce the occurrence of side reactions in the subsequent phosgenation reaction process, improve the reaction yield, and extend the operation cycle. The method is simple in process, easy to operate, low in operating cost, can realize automatic stable control, and has strong industrial applicability.

The invention provides a hydrocracking catalyst, which is characterized in that a catalyst I is formed by mixing a Y molecular sieve, alumina and an adhesive to serve as a carrier and is loaded with nickel and tungsten, a catalyst II is formed by mixing a ZSM-5 molecular sieve, alumina and an adhesive to serve as a carrier and is loaded with cobalt and tungsten, and the catalyst I and the catalyst II are mixed to obtain the hydrocracking catalyst. Cobalt and tungsten are loaded on the ZSM-5 molecular sieve, so that the influence of aromatic hydrocarbon on alkane adsorption reaction is reduced, bond breaking and isomerization reaction of alkane are enhanced, the pour point of the transformer oil is remarkably reduced, and the yield of the transformer oil is increased; nickel and tungsten are loaded on the Y molecular sieve, so that the ring-opening cracking reaction of aromatic hydrocarbon is enhanced, the aromatic hydrocarbon content in the transformer oil can be remarkably reduced, and the stability and chromaticity of the transformer oil are improved. The composite catalyst gives consideration to indexes of the aromatic hydrocarbon content and the pour point of the transformer oil, can realize partitioned reinforcement of an aromatic hydrocarbon ring-opening reaction and a paraffin bond-breaking isomerization reaction, and can directly produce a qualified transformer oil product.

The invention relates to a quench cooler electric decoking device and an electric decoking process, and belongs to the field of petrochemical engineering, the quench cooler electric decoking device comprises a current conversion controller, an input electrode, an output electrode, an input detection electrode, an output detection electrode, a detector and a pulse power supply. The input electrode and the input detection electrode are connected to the inlet end of a furnace tube of the quench cooler, the output electrode and the output detection electrode are connected to the outlet end of the furnace tube of the quench cooler, and the detector is connected with the input detection electrode and the output detection electrode. The current conversion controller loads set voltage and current to the two ends of the quench cooler furnace tube through the input electrode and the output electrode, and an electromagnetic field is formed in the quench cooler furnace tube; the flow direction of the reaction material in the furnace tube of the quench cooler is the same as the flow direction of the current; and the input detection electrode and the output detection electrode are used for detecting voltages at two ends of the furnace tube of the quench cooler in real time. The method improves the decoking effect, is suitable for decoking and oxygen-containing flue gas purification at high temperature, and prolongs the operation cycle of the quench cooler.

The invention discloses a fatty acid salt coking inhibitor as well as a preparation method and application thereof, and belongs to the technical field of coking inhibitors. According to the technical scheme, fatty acid reacts with a potassium compound to obtain the coking inhibitor, wherein the fatty acid is one or a mixture of oleic acid and stearic acid, and the potassium compound is potassium hydroxide, potassium carbonate or potassium bicarbonate. The coking inhibitor disclosed by the invention can be directly added into cracking raw oil for heavy raw material cracking furnaces such as diesel oil and tail oil, and injection equipment such as an inhibitor nozzle does not need to be additionally arranged independently, so that the unnecessary blocking risk is reduced, and the process complexity is reduced; and compared with the existing sulfur and phosphorus-containing oil-soluble inhibitor, the coking inhibitor provided by the invention has good decoking performance for middle and later-stage gas-phase coking.

The invention provides an intelligent micro-control group control oil well dosing device and method.The device comprises a host and a wellhead skid, the host comprises a PLC, a signal amplifier, a self-priming pump, a chemical tank, a dosing pump, a filtering device, a constant-pressure tank and a total flowmeter, the PLC controls the self-priming pump to feed water into the chemical tank through the signal amplifier, and the PLC controls the dosing pump to feed water into the chemical tank through the filtering device; a medicament is added into the medicament tank, the mixed medicament enters the medicament adding pump through the filtering device, the medicament adding pump conveys the mixed medicament to the constant-pressure tank, the medicament is metered through the total flow meter after constant pressure, then the medicament is conveyed into the wellhead skid, the medicament is metered again in the wellhead skid, and then the medicament is injected through an oil well casing. And real-time metering of single-well dosing data is realized. The intelligent micro-control group-control oil well dosing device and method are high in automation degree and safe and stable in operation, the labor intensity of workers and potential safety hazards are greatly reduced, and the loss of water and chemicals during oil well dosing is reduced.

The utility model relates to the field of petroleum chemical technology, concretely relates to a catalyst settlement system stable in operation and good in settlement effect, including clarification mechanism, sludge buffer tank, feed pipeline, sludge tank, backflow pipeline, overflow pipeline, filter press, filtrate tank and sludge discharge pipeline, the clarification mechanism includes a plurality of settlement tanks that are arranged side by side from front to back in proper order and the clarification tank that is arranged at the end of clarification mechanism, the bottom of clarification tank is provided with special ammonium sulfate solution discharge pipeline, is provided with ammonium sulfate solution pump on the ammonium sulfate solution discharge pipeline, the end of ammonium sulfate solution discharge pipeline extends to ammonium sulfate tank area, the outlet end of ammonium sulfate solution pump is equipped with a branch pipeline, this branch pipeline is connected with the feed inlet on the top of filtrate tank through regulating valve, the bottom outlet of filtrate tank is connected with the inlet of clarification mechanism through filtrate pump. The catalyst settlement system is stable in operation, and the downstream device operation cycle is prolonged.

The invention relates to the technical field of residual oil processing, in particular to a residual oil pretreatment method, a residual oil pretreatment device, a residual oil processing method and a residual oil processing system. Cooling the obtained hydrothermal conversion reaction product or heavy components in the hydrothermal conversion reaction product, carrying out ultrasonic dispersion with a solvent, carrying out centrifugal separation on the obtained mixed slurry, and carrying out solvent recovery on the obtained filtrate to obtain pretreated residual oil and a recovered solvent; wherein the content of Ni in the residual oil is 10-200 [mu] g / g, and the content of V in the residual oil is 10-450 [mu] g / g. The method has the advantages that the residual oil raw material adaptability is high, and the metal removal rate is high; meanwhile, the pretreated residual oil is subjected to hydrofining, and a better hydrofining product can be obtained and can be used for producing alpha-olefin.

The invention relates to the technical field of petrochemical engineering, in particular to a pre-flash tower bottom oil diversion and emergency oil return system which comprises a switching and shunting module, a pressure mixing module and a cooperative control module. Boosting the pressure of the slurry oil and then dividing the slurry oil into a first branch flow and a second branch flow; the first branch is communicated with a first conveying pipeline, the first conveying pipeline is communicated with a wax oil mixing part, and slurry oil and product wax oil from the vacuum tower are mixed at the wax oil mixing part; the second branch is communicated with a second conveying pipeline, and the second conveying pipeline is communicated with an emergency connector. According to the invention, integrated hardware multiplexing and cooperative control are carried out on the load optimization process and the blockage emergency oil return function of the vacuum tower, and embedded active safety protection is constructed while load reduction and efficiency improvement of the vacuum tower are realized, so that the processing load and operation continuity of the device are systematically improved.

The utility model discloses a protection reactor applied to a hydrotreating reactor, which comprises a feed inlet assembly, a filtration reaction tower, a hydrogenation assembly and a hydrotreating reactor, the feed inlet assembly provides crude oil to be treated for the filtration reaction tower, the hydrogenation assembly provides hydrogen for the filtration reaction tower, the filtration reaction tower is connected with the hydrotreating reactor, and the hydrotreating reactor is connected with the hydrogenation assembly. The filtering reaction tower conveys treated crude oil to the hydrotreating reactor for further reaction, the feed port assembly comprises a first feed port, a second feed port and a third feed port, the filtering reaction tower comprises a first bed layer, a second bed layer and a third bed layer, the first bed layer, the second bed layer and the third bed layer are sequentially arranged from top to bottom, and the first bed layer, the second bed layer and the third bed layer are sequentially arranged from top to bottom. The first feeding hole is connected with the first bed layer, the second feeding hole is connected with the second bed layer, and the third feeding hole is connected with the third bed layer, so that the continuous operation time of the hydrotreating reactor is greatly prolonged.

The invention relates to a sewage anaerobic ammonia oxidation denitrification reaction device and process, and relates to the technical field of sewage treatment; the device comprises a purification tank, a denitrification reactor, a cleaning tank and a cleaner; the denitrification reactor is arranged in the purification tank and the cleaning tank, the cleaning tank is used to maintain the denitrification reactor, the cleaner is used to clean the anaerobic bacteria diffusion cotton, and the cleaner comprises a filter screen plate for filtering impurities in the sewage; the invention can solve the following problems existing in the prior art: firstly, a large amount of impurities are mixed in the sewage, and when the sewage passes through the anaerobic bacteria sponge bed, the impurities in the sewage will enter the anaerobic bacteria sponge bed, causing the anaerobic bacteria sponge bed to be blocked and unable to denitrify the sewage, further affecting the efficiency of sewage denitrification; secondly, the anaerobic bacteria are concentrated on the anaerobic bacteria sponge bed, so when the sewage is purified, the sewage treatment effect will be poor, and at the same time, it is impossible to ensure that the anaerobic bacteria in the anaerobic bacteria sponge bed and the sewage are fully mixed.

The invention relates to a purification and separation method, a purification and separation system and a preparation method of isocyanate. The purification and separation method of isocyanate comprises the following steps: conveying an isocyanate reaction solution to a light component removal tower, and carrying out primary rectification to obtain an isocyanate crude product solution; directly conveying the first crude product liquid to a finished product tower, heating the second crude product liquid for partial gasification, and then conveying the second crude product liquid to the finished product tower for secondary rectification together with the first crude product liquid to obtain heavy components, isocyanate and low-boiling-point substances; heating a part of low-boiling-point substances for partial gasification, and then refluxing the low-boiling-point substances to the light component removal tower; in the processes of the first rectification and the second rectification, the inert medium is used for cleaning the trays in the light component removal tower and the finished product tower. The purification and separation method is simple to operate, the polymer generation rate is low, the yield of isocyanate is increased, meanwhile, solid waste is reduced, online self-cleaning is achieved, blockage of all equipment in the rectification process can be effectively avoided, the operation stability of the whole purification and separation system is guaranteed, and the operation cycle of the purification and separation system is greatly prolonged.