271results 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 tail gas treatment system and method.The tail gas treatment system comprises a carbon monoxide removal reactor, a first heat exchanger, a nitrous oxide decomposition reactor, an SCR reactor, a booster fan and a backflow pipeline, and a material inlet of the carbon monoxide removal reactor is connected with a tail gas source through a first pipeline; a material outlet of the carbon monoxide removal reactor is connected with a material inlet of the nitrous oxide decomposition reactor through a second pipeline and a low-temperature medium channel of the first heat exchanger, and a material outlet of the nitrous oxide decomposition reactor supplies materials to the booster fan through a third pipeline, a high-temperature medium channel of the first heat exchanger and a fourth pipeline. And the air outlet end of the booster fan is connected with the second pipeline through a return pipeline, and supplies materials to the SCR reactor through a fifth pipeline. The device is simple in structure and low in maintenance cost, can efficiently treat nitrous oxide-containing tail gas for a long period, and meets the environmental protection requirement.

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 direct coal liquefaction residue solvent extraction deliming method, refined asphalt and application, and relates to the technical field of solid waste resource treatment. According to the method, process conditions and process parameters are reasonably controlled, the thermal dissolution effect of an extraction agent and the liquefied residues is improved, a scale inhibitor composed of a multi-element alkyl organic matter, an auxiliary and coking washing oil is mixed with the extraction agent, then the ground liquefied residues are added into a material obtained through mixing, and the extraction agent and the liquefied residues are mixed uniformly. The slurry is prepared by controlling the stirring speed, the reaction temperature and the like; due to the addition of the scale inhibitor, the concentration of the residue extraction liquid is improved, and the treatment capacity and efficiency are enhanced; and a filter used for precision filtration adopts a stainless steel metal sintered filter element, so that the filter is resistant to higher temperature and pressure, the service life can be prolonged, and the stripping of viscous materials such as asphaltene in the liquefied residues is facilitated. The ultralow-ash refined asphalt prepared by the method can be used as a high-quality raw material of a high-end carbon material.

The utility model relates to the technical field of wastewater treatment, and discloses a high-hardness and high-salinity wastewater treatment device which comprises a seed crystal fluidization tank, a medicament storage tank, a crystallization and granulation fluidized bed and a multi-effect evaporation system, the crystallization and granulation fluidized bed is respectively connected with the seed crystal fluidization tank and the medicament storage tank through pipelines, and the multi-effect evaporation system is connected with the seed crystal fluidization tank and the medicament storage tank through pipelines. The liquid inlet position of the multi-effect evaporation system is connected with a liquid outlet end pipeline of the crystallization and granulation fluidized bed, the liquid return position of the multi-effect evaporation system is connected with a liquid inlet end pipeline of the crystallization and granulation fluidized bed, the air outlet end of the multi-effect evaporation system is connected with a condenser through a pipeline, and the condenser is connected with a vacuum pump through a pipeline; the liquid return position of the multi-effect evaporation system is externally connected with high-hardness and high-salinity wastewater, and the high-hardness and high-salinity wastewater can be mixed with return liquid flowing out of the liquid return position of the multi-effect evaporation system and then enters the liquid inlet end of the crystallization and granulation fluidized bed; the device has the advantages that the occupied area is reduced, and the operation cost is reduced.

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 present invention provides a water treatment method and a water treatment system for purification of methanol-to-olefin product gas, which can effectively remove particulate matter and oily wax-like organic matter in the quenched water turbidity generated in the product gas purification process. The water treatment method comprises: sending the product gas into a quenching tower for washing and cooling with quenching water to obtain quenched product gas and quenched water turbidity; sending the quenched product gas into a water washing tower for washing and cooling again to obtain washed product gas and washed water turbidity; circulating part of the washed water turbidity to the water washing tower, sending part of the washed water turbidity to the quenching tower; sending the quenched water turbidity to a microchannel separator for treatment to remove particulate matter and part of organic matter in the quenched water turbidity to obtain quenched water clear liquid; sending part of the quenched water clear liquid to the quenching tower, sending part of the quenched water clear liquid to the water washing tower; sending part of the quenched water clear liquid and part of the washed water turbidity to a sewage stripping tower for treatment.

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 belongs to the technical field of oil well anti-scaling indoor tests, and discloses an underground composite alloy anti-scaling device indoor dynamic simulation test device which comprises an anti-scaling module and a comparison module, the anti-scaling module comprises a first container water tank, a first anti-scaling test hanging piece, a composite alloy anti-scaling device, a first temperature control system and a first fluid circulation system, the first anti-scaling test hanging piece is arranged in the first container water tank, and the composite alloy anti-scaling device is arranged in the first container water tank and connected to the first fluid circulation system in series. And the comparison module comprises a second container water tank, a second anti-scaling test hanging piece, a second temperature control system and a second fluid circulation system. The invention further discloses an indoor dynamic simulation test method for the underground composite alloy anti-scaling device. The current situation of the underground scaling technology is known, and the influence rule of the temperature and the flow speed on the anti-scaling effect of the composite alloy device is obtained.

The invention discloses an intelligent low-carbon treatment and recycling system for rainwater and sewage. The system comprises a biological retention module used for collecting and treating rainwater to obtain treated rainwater; the numerical control drainage module is used for collecting oxidation-reduction potential data and pH value data of the processed rainwater as environmental data to be transmitted to the control module, and discharging the processed rainwater in a preset duration based on a first control signal sent by the control module; the rainwater and sewage collecting module is used for storing the discharged treated rainwater and maintaining the water storage amount within a preset range; the irrigation module is used for collecting soil humidity data of the bioretention module and transmitting the soil humidity data to the control module, and extracting stored water in the rainwater and sewage collection module based on a second control signal sent by the control unit to irrigate the bioretention module; the control module is used for receiving the environment data and performing double judgment, sending a first control signal when a preset condition is met, receiving the soil humidity data, and sending a second control signal when the preset condition is met. The stable and efficient low-carbon treatment and recycling of the rain sewage are realized.

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 present invention discloses a high-silicon naphtha processing system and a processing technology. The high-silicon naphtha processing system of the present invention comprises a fixed bed reactor, a desiliconization reactor, a heat exchanger and a fractionation unit; the fixed bed reactor is composed of a gas phase reaction zone, a gas-liquid separation zone, a gas-liquid countercurrent zone, a gas-liquid contact zone and a liquid phase reaction zone from top to bottom. The high-silicon naphtha processing technology comprises: hydrogen first enters the gas-liquid contact zone at the bottom of the fixed bed reactor, the high-silicon naphtha and the olefin-rich raw material enter the gas-liquid separation zone from the top of the fixed bed reactor, the materials react in each reaction zone, the desiliconized product is mixed with the bottom effluent of the liquid phase reaction zone after heat exchange, and stripping and fractionation are performed to obtain qualified products. The present invention not only realizes the efficient removal of silicon in high-silicon raw materials, but also can simultaneously process conventional coking raw materials, obtain qualified chemical raw materials and automotive diesel products, and at the same time extend the operation cycle of the coking oil processing device.

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.

The invention discloses a high-boiling cracking waste liquid treatment system and method in a polycrystalline silicon production process, and belongs to the technical field of high-boiling cracking waste liquid treatment.The system comprises a waste liquid buffer tank, a waste liquid hydrolysis tank, a lime milk preparation pool, a waste alkali buffer pool, a drying pool and a tail gas spraying and washing unit; the feeding end of the waste liquid buffer tank is connected with the reaction tank, and the discharging end of the waste liquid buffer tank is connected with the waste liquid hydrolysis tank; an alkali liquor inlet of the waste liquor hydrolysis tank is connected with the waste alkali buffer pool, a lime milk inlet of the waste liquor hydrolysis tank is connected with the lime milk preparation pool, a bottom discharge port of the waste liquor hydrolysis tank is connected with the drying pool through a liquid seal tank drainage pipeline, and a top tail gas phase outlet of the waste liquor hydrolysis tank is connected with the hydrolysis tail gas spraying and washing unit; the drying tank is provided with a water outlet, and the water outlet is connected to the lime milk preparation tank through a trench. According to the method, the sodium hydroxide waste alkali liquor and the lime powder are used for treating the high-boiling cracking waste liquid, the purpose of treating waste with waste is achieved, and meanwhile zero sewage discharge is achieved.

The invention discloses a folding subsurface flow wetland capable of being produced in batches and a processing and mounting method thereof, and relates to the technical field of sewage treatment.The folding subsurface flow wetland comprises an anti-seepage film and a cushion layer which are laid in a plain soil pit, the cushion layer is filled in a closed area defined by the anti-seepage film, and the cushion layer comprises a filler layer and a soil mellow layer; the filler layer is laid on the anti-seepage film, a water collecting pipe system is distributed in the middle of the filler layer, and a soil matured layer for plant growth is arranged above the filler layer. Sewage is treated through a microbial soil infiltration treatment technology, the rural domestic sewage treatment effect is considered, meanwhile, the construction difficulty is small, the occupied area is small, and the construction cost is low. The system can be fully integrated into a small vegetable garden or small garden ecological system of a peasant household, protects the farmland cultivation and planting habits of the peasant household, is small in investment and low in cost, and meets the requirements of domestic sewage treatment and recycling in vast rural areas.

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 invention belongs to the technical field of hematite denitration, and particularly relates to a method suitable for middle denitration of superfine hematite pellets, which comprises the following steps: (1) controlling the high-point temperature of flue gas of a catalyst layer of a denitration tower to be 390-400 DEG C; (2) the high-point temperature of a preheating second-section air bellow of the chain grate machine is controlled to be 550-590 DEG C; (3) increasing the air volume of a backheating fan; (4) the temperature of an inlet of a main exhaust fan is controlled to be 140-150 DEG C, and the negative pressure of a kiln tail is controlled to be 220-260 Pa; (5) increasing the distribution thickness of the south side and the north side of the chain grate machine, controlling the distribution thickness to be 190 + / -10mm, and controlling the thickness difference between the south side and the north side to be + / -5mm; (6) a first air bellow branch pipe of the first preheating section of the chain grate machine is connected to a regenerative horizontal pipe of the second preheating section of the chain grate machine; (7) adjusting a float flowmeter according to the nitrogen oxide content of the original flue gas at the inlet of the south-north denitration tower, increasing the ammonia spraying amount of the south-side denitration tower, and reducing the ammonia spraying amount of the north-side denitration tower; and (8) the emission of nitric oxide is controlled in a centralized control mode, and the emission is controlled to be 20-30 mg / Nm. By adopting the method, ammonia escape is reduced, the temperatures of the first preheating section and the second preheating section are controlled, and the denitration efficiency is improved.

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 present invention discloses a two-stage hydrocracking method for producing more chemical raw materials. The method comprises: the raw oil and hydrogen first enter the first hydrogenation reaction zone in the two stages for reaction, the one-way conversion rate of the first hydrogenation reaction zone is controlled to be 70% to 85%, the effluent of the first hydrogenation reaction zone enters a high-pressure gas-liquid phase separator with a pressure lower than that of the first hydrogenation reaction zone and a temperature of 80 to 100°C, so that the mass ratio of hydrogen to hydrocarbons in the gas phase component obtained at the top of the high-pressure gas-liquid phase separator is 1.20 to 1.70, the liquid phase component obtained at the bottom is separated and fractionated to obtain light hydrocarbons, light naphtha, heavy naphtha, diesel and tail oil, the diesel and the gas phase component at the top of the high-pressure gas-liquid phase separator enter the second hydrogenation reaction zone in the two stages for reaction, the one-way conversion rate of the second hydrogenation reaction zone is controlled to be 40% to 80%, and the second hydrogenation reaction zone is subjected to the separation and fractionation. The method of the present invention can achieve the purpose of increasing the production of high-quality chemical raw materials by only slightly adjusting the process, and has the advantages of long-term stable operation.