35results about How to "Fully converted" patented technology

The invention relates to the technical field of aerobic composting, in particular to a material turning device for aerobic composting and a layered turning method. The material turning and throwing device for aerobic composting comprises a walking mechanism, a supporting frame and a turning and throwing assembly, the turning and throwing assembly comprises a first turning and throwing roller assembly and a second turning and throwing roller assembly, and the first turning and throwing roller assembly is higher than the second turning and throwing roller assembly and turns and throws materials entering a turning and throwing channel in a layered mode; the second turning and throwing roller assembly comprises a roller shaft, a cutter structure and an adjusting structure used for driving the cutter structure to stretch out and draw back in the radial direction of the roller shaft, a telescopic part of the adjusting structure and the roller shaft are coaxially arranged, the adjusting structure is used for driving an adjusting rod to move in the axial direction of the roller shaft, and a mounting base corresponding to the cutter structure is arranged on the adjusting rod; the cutter structure is connected with the mounting seat through a connecting rod. According to the material turning and throwing device for aerobic composting, the turning and throwing effect is improved, the uniformity of turning and throwing materials is improved, the energy consumption is reduced, and the fermentation period of aerobic composting is shortened.

According to the method, a one-pot copolymerization method is adopted, MBAA and borax serve as cross-linking agents, zwitterionic polyelectrolyte hydrogel containing SBMA, PVA, THMA and AMPS is prepared, and the zwitterionic polyelectrolyte hydrogel has excellent adhesion performance and biocompatibility and is suitable for the field of biological medicine. According to the method, the physical characteristics of the hydrogel are enhanced due to crosslinking sites and hydrogen bonds of polyvinyl alcohol. The cationic and anionic groups of SBMA improve the adhesion performance, and the reaction monomer THMA provides hydrogen-bond interaction to further promote adhesion, so that the prepared hydrogel adhesive shows excellent adhesion performance and biocompatibility, and is suitable for biological medicine application of wound dressing, drug release systems, tissue engineering and the like.

The invention discloses carbon monoxide gas oxidative dehydrogenation equipment, which belongs to the field of carbon monoxide treatment and comprises a hollow shell, a gas inlet cover fixedly connected to the upper end of the hollow shell, a bottom plate fixedly connected to the inner wall of the hollow shell and a first exhaust port formed in the lower end of the bottom plate. A first partition plate and a second partition plate located below the first partition plate are further fixedly connected to the inner wall of the hollow shell, and a flow passing cavity is formed between the upper portion of the first partition plate and the air inlet cover. The cooling air ring can exhaust oxygen to the inner wall of the reaction through hole, it is ensured that the oxygen is evenly distributed on the inner wall of the reaction through hole, the oxygen is prevented from being concentrated in a certain area, and therefore the catalytic reaction efficiency is improved; it is ensured that the catalytic reaction is evenly conducted in the whole catalyst, the situation that the reaction efficiency is reduced due to insufficient oxygen or unsmooth airflow in a local area is avoided, and it is ensured that reactants can be fully converted.

The invention discloses a processing method of a traditional Chinese medicine residue organic fertilizer. The traditional Chinese medicine residue organic fertilizer comprises the following components in parts by weight: 50-60 parts of traditional Chinese medicine residue, 15-20 parts of straw, 10-15 parts of urea, 4-8 parts of potassium sulfate, 20-30 parts of livestock manure and 2-5 parts of trace elements. The design of the traditional Chinese medicine residue organic fertilizer formula aims at converting waste traditional Chinese medicine residues into organic fertilizer with efficient fertility. The traditional Chinese medicine residues are used as organic wastes, contain rich organic substances and trace elements, and are high-quality raw materials for preparing organic fertilizers. Straw is used as an agricultural waste, also contains rich organic substances and is matched with the traditional Chinese medicine residues for use, so that the fertilizer efficiency of the fertilizer can be improved, and the soil structure can be improved. Urea and potassium sulfate serve as main nitrogen and potassium sources, necessary nutrient elements are provided for crops, and crop growth is promoted. And the livestock manure is a high-quality organic fertilizer, is rich in various nutrient elements such as nitrogen, phosphorus and potassium, and is beneficial to improving the soil fertility and promoting the crops to absorb nutrients.

The invention discloses a method for recovering a lithium element in a retired ternary lithium battery positive electrode material, and relates to the technical field of battery recovery, and the method comprises the following steps: S1, uniformly mixed carbon powder and ternary positive electrode recovery powder are placed in a reduction furnace, and a carbon thermal reduction reaction is carried out under the protection of a nitrogen atmosphere to obtain a reduced material; s2, the reduction material, pure water and grinding balls are put into a pressurized ball milling tank, carbon dioxide is introduced, ball milling is conducted in the high-pressure environment of 2-5 MPa, and ball milling slurry is obtained; s3, carrying out solid-liquid separation on the ball-milled slurry to obtain a lithium extraction leachate; s4, the lithium extraction leachate is subjected to impurity removal, concentration and thermal decomposition, and lithium carbonate crystals are obtained; and S5, washing, drying and crushing the lithium carbonate crystals to obtain the battery-grade lithium carbonate. According to the method disclosed by the invention, lithium is extracted by matching carbon dioxide with ball-milling water in a high-pressure environment, so that the leaching efficiency and the leaching rate of the lithium element in the reduced ternary positive electrode recycled powder can be effectively improved.

The invention discloses a flue-cured tobacco upper leaf nutrition regulation and matched flue-curing method, which comprises the following steps: S1, primary spraying: spraying a leaf surface regulator I in 3-5 days after middle tobacco leaves are mature and harvested; s2, secondary spraying: spraying a leaf surface conditioning agent II 1-2 days before the upper tobacco leaves are mature and harvested; s3, baking: baking by adopting a baking process of'one low, one high and one long 'in a yellowing period, 'one slow, one low and one long' in a color fixing period and'one slow, one long and one low 'in a stem drying period; the method can effectively improve the quality and baking characteristics of the upper fresh tobacco leaves, reduce diseases of the upper tobacco leaves in the field, and improve the quality of the baked upper tobacco leaves.

The invention discloses a method for producing a silicon-manganese alloy by using electrolytic manganese sulfide slag. The method comprises the following steps: mixing the sulfide slag with coke or fine coal in proportion, calcining at high temperature, gradually heating in the process to remove crystal water, and carrying out decomposition, oxidation and reduction reactions. Sulfur dioxide gas generated in the calcining process is collected and converted into industrial sulfuric acid. And the calcined manganese-rich slag is used for producing the silicon-manganese alloy. The method has the beneficial effects that the valuable elements in the vulcanized slag are efficiently recycled, the environmental pollution is reduced, the economic benefit is improved, the sustainable development is promoted, the treatment efficiency is improved, the aims of comprehensive utilization and environmental protection of the vulcanized slag are achieved, and an effective solution is provided for industrial production.

The application discloses a kind of preparation methods of south Shaanxi flavor bean curd, belong to the technical field of soy products processing.The method includes time selection, acid water production, embryo production, embryo natural fermentation, seasoning production and fermented bean curd pickling and the like steps, under the natural temperature conditions in south Shaanxi region winter, using the acid water obtained by vegetable natural fermentation to point slurry, and under the condition of not inoculating artificial culture strain, solid-state natural fermentation and post-ripening fermentation are carried out to the embryo.By solid-state fermentation and continuous post-ripening, the stable flavor and good texture of bean curd are formed without relying on food additives.The process flow of the method is clear, the operation condition requirement is low, the finished product flavor is mellow, the nutrition conversion is sufficient, and the method has good safety, repeatability and popularization and application value.

The invention belongs to the technical field of chemical reaction equipment, and particularly relates to a lateral flow catalyst bed layer structure which comprises a shell assembly, a plurality of feeding assemblies are evenly arranged in the shell assembly in a staggered mode, a plurality of adjusting assemblies are evenly arranged in the shell assembly, and all the adjusting assemblies correspond to the feeding assemblies; the shell assembly comprises a shell, a reaction cavity is formed in the shell, a catalyst is arranged in the reaction cavity, and a plurality of heat conduction columns are arranged in the reaction cavity in a penetrating mode. According to the catalyst bed structure, the flowing path of reactants is improved, disturbance in the reaction cavity is increased, the reactants are promoted to be evenly distributed, in addition, the opening area of the discharging holes can be adjusted, transverse vibration of the catalyst can be achieved, the flowing stability of the reactants in the catalyst is further guaranteed, and the reaction is promoted to be carried out in the positive direction.

The invention discloses a preparation technology for processing honey-fragrance black tea by using golden tea, and the preparation technology comprises the steps of heavy withering, long-time light rolling, high-temperature rapid fermentation and drying, according to the technology, the moisture of rolled leaves is reduced through heavy withering, the fragrance and taste of the rolled tea leaves are improved, long-time light rolling is adopted, the juice yield of the rolled leaves is reduced, the cell breakage rate is increased, and the strip forming rate is promoted; according to the technology, through high-temperature rapid fermentation, high-temperature and high-humidity fermentation promotion, fermentation speed acceleration, fermentation uniformity improvement, effective control, medium gross fire rapid passing, timely fermentation termination and short-time moisture regaining, the moisture of dried leaves is uniform, better conditions are created for next-step drying, the shaping effect is achieved through heating and rolling frying in the technology, and meanwhile further dehydration and shaping are achieved; and high-temperature short-time re-drying, rapid dehydration and high-temperature re-drying can rapidly dehydrate the tea leaves, maintain the flavor of the tea leaves, reduce the influence of long-time temperature and humidity on varieties, realize low-temperature long-time sufficient drying, realize alcoholization and impurity removal, ensure sufficient drying of the tea leaves and ensure the product quality.

The utility model relates to wind power generation technical field discloses wind power generation device, including support subassembly, wind wheel subassembly and power generation subassembly, wind wheel subassembly includes main shaft and impeller, and the main shaft fixed mounting is in support subassembly, and the impeller rotatablely installs on the main shaft, power generation subassembly includes first power generation unit and second power generation unit, and the stator of first power generation unit and second power generation unit all fixed mounting is in main shaft, and the outer rotor of first power generation unit and second power generation unit all are connected with the impeller fixedly, the utility model under the same wind force condition, first power generation unit and second power generation unit can work simultaneously, and the mechanical energy of impeller capture is more efficient, more fully converts into electric energy, effectively increases the overall power generation, improves the wind energy utilization efficiency and power generation efficiency, solves when the outside wind speed is at the low level, and the overall power generation of generator is insufficient.

The utility model discloses a conversion tube structure of a nitrogen oxide converter and the nitrogen oxide converter, the conversion tube structure comprises a conversion tube main body, a filler area is arranged in the conversion tube main body, and the filler area is used for placing conversion filler; the breathable partition plate is arranged in the conversion pipe main body and is used for partitioning the conversion filler in the filler area; the elastic structure is located in the conversion pipe body, makes contact with the breathable partition plate and applies elastic force to the breathable partition plate. According to the nitrogen oxide converter, the internal space of the conversion pipe is rearranged and reformed, the ventilation partition plate is additionally arranged on the conversion pipe, and the elastic structure capable of freely rebounding is arranged at the bottom of the conversion pipe, so that smoke can be fully converted when the nitrogen oxide converter is used, and the effect that the nitrogen oxide converter continuously and normally works for a long time is achieved; the nitrogen oxide conversion function is more stable, more efficient and more sufficient, and the purpose of reducing the field use cost is achieved.

A method for the synergistic lithium and phosphorus supplementation and targeted regeneration of lithium iron phosphate (LFP) cathode materials is disclosed, involving a regeneration and repair method for retired LFP cathode materials. This method aims to address the technical problems of poor uniformity, poor electrochemical performance, and poor safety associated with existing direct regeneration methods for retired LFP cathode materials. The method comprises: 1. Cathode material stripping and crushing; 2. Preparation of an aqueous repair solution using a reducing agent, lithium salt, and phytic acid; reaction of the degraded LFP black powder in the repair solution; filtration, drying, and segmented sintering to completely reconstruct the material's intact crystal structure and coat it with a highly conductive carbon layer. The regenerated LFP cathode material exhibits a discharge specific capacity of up to 149.7 mAh g⁻¹ at a current density of 1 C. ‑ ¹, and it is cycle-stable, making it suitable for use in the battery industry.

The invention provides a method for prolonging the cycle life of a conversion reaction positive electrode battery based on large-current pulse activation. According to the invention, a conventional low-current constant-current activation mode is replaced by a specific charge-discharge system activation method for the conversion reaction positive electrode battery; a conversion reaction positive electrode is repeatedly stimulated, a product is regulated and controlled to be uniformly nucleated, a stable reaction interface is formed, a homogeneous reaction of the product is smoothly realized, a diffusion barrier of a two-phase product reaction is reduced, and a discharge product is promoted to be fully converted into an active substance material; and the volume expansion of the pole piece is effectively inhibited, so that the problems of capacity attenuation and unstable cycle performance of a conversion reaction positive electrode battery caused by inactivation, falling and passivation of active substances are improved. Besides, compared with a traditional low-current activation system, the charging and discharging system provided by the invention shortens the time and can promote the battery to quickly reach the optimal performance state, so that the commercialization value is further improved for the application of the battery.

The invention discloses a preparation method and application of a catalyst for producing methyl methacrylate and co-producing methylacrolein. The catalyst contains two catalytic promoters at the same time so as to provide catalytic active sites for producing methyl methacrylate and methylacrolein. When the mass ratio of the catalytic promoter to the active component is in a range of 0.2-0.45, relatively high methyl methacrylate selectivity can be realized; and when the mass ratio is in a range of 0.45-0.8, co-production of methyl methacrylate and methylacrolein can be realized. According to the catalyst, the product distribution of methyl methacrylate and methylacrolein can be more flexibly regulated and controlled, the economical efficiency of the whole process is optimized, the preparation process is simple, and the catalyst is suitable for large-scale industrial application.

This utility model provides a horizontal energy-saving land-based booster pump, belonging to the field of booster pump technology. It solves the problem of insufficient efficiency in existing booster pumps. This utility model includes a shell, a suction chamber, and a discharge chamber. A connecting groove is provided on the outer side of one end of the valve seat, which connects to the end of the discharge chamber through the connecting groove. A cover plate is installed between each impeller assembly. The pump shaft passes through the impeller assembly and the support, with one end connected to the inside of the valve seat. An upper shaft sleeve is installed inside the valve seat, and the pump shaft is connected to the upper shaft sleeve. The support is installed on one side of the impeller assembly, and a bearing seat is formed inside the support. A rubber guide bearing is installed in the bearing seat. A first adjusting shaft sleeve is fitted around the outer circumference of the pump shaft at one end of the bearing seat. A support end cover is installed on the outer end of one side of the bearing seat, and a sealing gasket is installed inside the support end cover. The pump shaft passes through the support end cover and the sealing gasket. This utility model has the advantages of reduced energy loss and high overall efficiency.

The invention relates to the technical field of 4A zeolite production, and discloses a preparation method for producing 4A zeolite by using coal gangue, which comprises the following steps: carrying out pretreatment, sodium carbonate alkali fusion, water quenching, wet grinding, solid-liquid separation, caustic soda alkali fusion, dry powder dissolution, primary caustic soda alkali fusion, secondary caustic soda alkali fusion, tertiary caustic soda alkali fusion, mold adjustment, slurrying, crystallization and drying on the coal gangue to obtain the 4A zeolite. The coal gangue is used as a raw material, aluminum oxide and silicon dioxide in the coal gangue can be fully extracted through the method, the yield of the 4A zeolite is increased, and the obtained 4A zeolite has the advantages of being high in crystallinity and whiteness, low in impurity content, large in cation exchange capacity and the like.

The application discloses a catalyst for synthesizing 2,6-dimethylphenol and a preparation method thereof, and relates to the technical field of organic synthesis catalysis. The catalyst comprises a composite catalytic system and an active component loaded in the composite catalytic system. The composite catalytic system is a mixed filler of cerium modified molecular sieves and molecularly imprinted polymers. The active component is a combination of iron salt and magnesium salt. The catalyst for synthesizing 2,6-dimethylphenol and the preparation method thereof can greatly improve the yield of 2,6-dimethylphenol through synergistic catalysis of the iron salt and the magnesium salt, shape selection and screening of the cerium modified molecular sieves and synergistic effect of the molecularly imprinted polymers, and is significantly superior to traditional catalysts. The selectivity of 2,6-dimethylphenol is significantly improved through the shape selection of the cerium modified molecular sieves and the selective adsorption of the molecularly imprinted polymers on o-cresol.

This invention discloses a curing process for the upper tobacco leaves of Yunyan 87 based on the synergistic regulation of yellowing and color fixation. The yellowing period is divided into three stages: in the early stage, the temperature is increased at 0.8~1.2℃ / h to 36~38℃ (wet bulb 31~35℃), and the temperature is maintained for 10~14h until the high-temperature layer begins to yellow; in the middle stage, the temperature is increased at 0.8~1.2℃ / 3h to 39~41℃ (wet bulb 35~36℃), and the temperature is maintained for 18~22h until the high-temperature layer is completely yellow and collapses; in the late stage, the temperature is increased at 0.8~1.2℃ / 4h to 41~43℃, and the temperature is maintained for 18~22h. The color-fixing period is divided into three stages: in the early stage, the temperature is raised to 44~46℃ (wet bulb 34~35℃) and stabilized for 3~4 hours until the main vein of the high-temperature layer turns white; in the middle stage, the temperature is raised to 47~49℃ (wet bulb 35~36℃) and stabilized for 16~20 hours until the leaf veins of the low-temperature layer turn white and the leaves turn yellow; in the later stage, the temperature is raised to 53~55℃ (wet bulb 36~37℃) and stabilized for 18~20 hours until the leaf tissue of the low-temperature layer is completely dry. Compared with the existing curing process, this process moderately raises the temperature and humidity during the yellowing stage and moderately reduces the humidity and curing time during the color-fixing stage, so that the tobacco leaves turn yellow fully, promote the rapid degradation of starch and the transformation of aroma components, and avoid the phenomenon of green curing, lees curing and ash hanging on the upper tobacco leaves due to insufficient yellowing and color fixing.

This invention discloses a method for the ethylene glycol hydrolysis of polyethylene terephthalate (PET) with staged control of ethylene glycol dosage. The method includes: in a first stage, adding PET and ethylene glycol to the reaction system at a molar ratio of 1:1 to 1:3, and reacting at 180–196 °C for 0.5–2 h under the action of a solid catalyst; in a second stage, adding ethylene glycol to the reaction system to achieve a molar ratio of ethylene glycol to PET of 1:5 to 1:8, and continuing the reaction for another 2–4 h. By adding ethylene glycol in stages, the conversion degree of oligomers during the reaction is improved, thereby significantly increasing the monomer yield under the same ethylene glycol dosage conditions, reducing oligomer residue, and lowering subsequent separation costs.

The invention relates to the technical field of 4A zeolite production, and discloses a preparation method for producing 4A zeolite based on coal gangue, which comprises the following steps: adopting coal gangue, carrying out a roasting process, sodium carbonate alkali melting and refining process, carrying out a three-time extraction process, adjusting a mold, slurrying, crystallizing and drying to obtain the 4A zeolite. The coal gangue is used as a raw material, aluminum oxide and silicon dioxide in the coal gangue can be fully extracted through the method, the yield of the 4A zeolite is increased, and the obtained 4A zeolite has the advantages of being high in crystallinity and whiteness, low in impurity content, large in cation exchange capacity and the like.

The present invention relates to a floating beam green tea processing technology, which comprises the steps of tedding, fixation, spreading for cooling, rolling and parching, the fixation is divided into three steps: first steam fixation is performed, the temperatures of the front, middle and rear sections in a cylinder are different, ozone water washing is performed after the first fixation, the second fixation adopts microwave fixation, and nitrogen-containing substances are supplemented and sprayed before the fixation. And finally, the floating beam green tea which is mellow in tea fragrance, green in leaf bottom and light green and bright in soup color is obtained.

The invention discloses a porphyrin COF material as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment material preparation. The preparation method disclosed by the invention comprises the following steps: S1, reacting tetracarboxyl porphyrin, trivalent iron salt and a solvent under a reflux condition, and after the reaction is finished, carrying out post-treatment on an obtained reaction product to obtain a Fe < 3 + >-TCPP solid; s2, the Fe < 3 + >-TCPP solid, an acylating chlorination reagent and a solvent are subjected to a reaction under the reflux condition, after the reaction is finished, an obtained reaction product is subjected to aftertreatment, and a Fe < 3 + >-TCPP-COCl solid is obtained; s3, the Fe < 3 + >-TCPP-COCl solid and p-phenylenediamine are ground and subjected to a reaction, after the reaction is finished, an obtained reaction product is subjected to aftertreatment, and a porphyrin COF material is obtained; the method overcomes the limitation of the traditional preparation method.

The invention provides a process for comprehensively recovering valuable metals from tin-containing soot, which comprises the following steps: taking the tin-containing soot, carrying out first-stage high-pressure oxygen leaching to obtain a first-stage leaching solution and first-stage leaching residues, and recovering lead, bismuth and tin valuable metals from the first-stage leaching residues; the tin-containing soot and the first-section leachate are subjected to second-section high-pressure oxygen leaching, second-section leachate and second-section leaching residues are obtained, and the second-section leaching residues are returned to the first-section high-pressure oxygen leaching; copper recovery is conducted on the second-section leaching solution, and copper deposition post-solution and copper sulfide slag are obtained; the copper sulphide slag is subjected to alkali washing to obtain alkali washing liquid and copper sulphide; reacting the copper-deposited solution with sulfur dioxide, and then reacting with hydrogen sulfide to obtain an arsenic-deposited solution and arsenic sulfide slag; and the arsenic sulfide slag is subjected to copper replacement and arsenic replacement, and arsenic trioxide and copper sulfide are recycled. According to the method, valuable metals such as arsenic, copper, bismuth and tin in the tin-containing soot are separated and comprehensively recycled one by one, the recycling efficiency is high, the cost is low, the hazardous waste tin-containing soot is effectively treated, meanwhile, the wastewater yield is small, almost no waste residue is generated, and secondary pollution to the environment is avoided.

The invention discloses a regeneration method for lithium battery waste, belongs to the technical field of waste battery regeneration, and mainly relates to a hydrogen reduction roasting method for lithium battery waste, including three-stage reduction roasting; the temperature of the first stage reduction roasting is 450±20℃, the hydrogen flow rate is 10‑15m 3 / h tons of material, the reduction roasting time is 10-20min, the second stage reduction roasting temperature is 530±40℃, and the hydrogen flow rate is 20-30m 3 / h tons of material, the reduction roasting time is 10-40min, the temperature of the third stage reduction roasting is 620±30℃, and the hydrogen flow rate is 25-30m 3 / h tons of material, and the reduction roasting time is 10-30min. After the roasting product is leached, the leachate is further treated to remove impurities and precipitate lithium to prepare a lithium salt product, and the leached residue is subsequently treated to separate and recover nickel and / or cobalt and manganese. The method of the present invention can achieve simple and efficient separation of valuable elements in lithium battery waste.

This invention discloses a reactor for water-gas shift reaction and its application. The reactor is suitable for water-gas shift reaction processes containing gaseous and liquid reactants. A reaction chamber is set inside a hollow, sealed cylinder formed by the reactor walls. The reaction chamber is a hollow, sealed chamber surrounded by porous material as its wall surface. A gaseous reactant inlet pipe penetrates the reactor wall and extends into the upper part of the reaction chamber, a liquid reactant inlet pipe penetrates the reactor wall and extends into the cylinder, and a reaction product outlet pipe penetrates the reactor wall and extends into the lower part of the reaction chamber. The catalyst for the water-gas shift reaction is packed in the reaction chamber. The water-gas shift reaction can be carried out under near-isothermal conditions. Water in the liquid reactant does not need to be pre-vaporized and is directly fed into the reactor in liquid form, saving the energy consumption required to transport the corresponding amount of water vapor. Simultaneously, a high molar ratio of water to carbon monoxide is maintained within the reactor, promoting complete conversion of carbon monoxide.

The present invention relates to a processing method of special flavor Kung Fu black tea, comprising: (1) selecting fresh leaves of small and medium leaf tea varieties suitable for making black tea as raw materials; (2) picking fresh leaves of small and medium leaf tea varieties from late March to early May; (3) performing temperature, light and wind withering treatment; (4) shaking treatment; (5) performing secondary withering; (6) ultrasonic crushing to promote the crushing of leaf cell membranes and vacuole membranes, and promote the full biochemical reaction between enzymes in the leaves and substrates (7) performing variable frequency short-time cold rolling; (8) performing low-temperature medium-humidity dynamic fermentation; (9) performing a primary drying operation by roller-hot air coupled rolling drying; (10) conveying the primary dried leaves treated in step (9) to a cooling room by a conveyor belt, and removing broken leaves and yellow leaves by a winnowing machine; (11) performing a low-temperature long-time hot air sufficient drying operation; (12) performing a temperature-controlled and humidity-controlled far-infrared aroma treatment on the tea sample obtained by the treatment in step (11), and after completion, a sweet and mellow black tea is obtained.

The application relates to a method and a special smoking room for low-temperature smoked bacon, and relates to the technical field of meat product deep processing and food machinery engineering. The special part is that a special low-temperature smoking room is used for temperature section smoking: first stage smoking: the smoke temperature is adjusted through a circulating water cooling device, the smoke gas temperature contacted by the bottom layer of bacon blanks in the bacon smoking room is controlled to be 20-25 DEG C, the smoke gas temperature contacted by the top layer of bacon blanks is controlled to be 15-20 DEG C, and smoking is carried out for 2-4 months; second stage smoking: the smoke gas temperature contacted by the bottom layer of bacon blanks in the bacon smoking room is controlled to be 30-35 DEG C, and the smoke gas temperature contacted by the top layer of bacon blanks is controlled to be 25-30 DEG C. Beneficial effects: the oil and fire are separated, and the problem of carcinogens such as benzo[a]pyrene generated by high-temperature cracking of oil is completely eliminated. Meanwhile, the fire risk is greatly reduced, the disadvantages of 'upper maturation and lower growth' or local overheating in the traditional process are eliminated, the controllability of process parameters is high, and a reliable technical path is provided for the standardization and large-scale production of bacon.

The utility model belongs to the technical field of production devices, and particularly relates to a cyclodextrin conversion reaction device which comprises a reaction kettle and a buffer tank connected with the reaction kettle, a raw material opening is formed in the top of the reaction kettle, a stirrer is arranged in the reaction kettle and penetrates through the top of the reaction kettle to be connected with a motor, and a feeding opening is formed in the bottom of the reaction kettle. A liquid distributor is arranged at the lower part of the inner side of the reaction kettle and is connected with the feeding hole, a suction pipe is arranged in the reaction kettle in a surrounding manner, a plurality of through holes are formed in the suction pipe, the suction pipe is connected with the top of a buffer tank through a pipeline, a nitrogen pipeline is arranged on the buffer tank, and the bottom of the buffer tank is connected with the feeding hole through a pipeline. According to the method, the cyclodextrin conversion reaction is carried out in a countercurrent circulation manner, so that the contact area of cyclodextrin and a chemical additive can be increased, and the conversion efficiency of cyclodextrin is improved.

This utility model provides a multi-stage water pump, belonging to the field of water pump technology. It solves the problem of insufficient rectification effect of the diffuser in existing water pumps. This utility model includes a pump cover, pump casing, volute, multi-stage impeller assembly, pump shaft, and bearing housing. The multi-stage impeller assembly is installed inside the pump casing and includes a diffuser and impeller body. The diffuser is an integrally formed structure and includes a front diffuser end and a rear diffuser end. A rear diffuser blade is formed on the front side of the rear diffuser end and is connected to the rear side of the front diffuser end. A rear diffuser flow channel is formed between the front and rear diffuser ends. A cavity is formed on the front side of the front diffuser end, and a mounting seat is formed inside the cavity. The impeller body is installed in the mounting seat. Several front diffuser blades are formed inside the front diffuser end, and several diffusion windows are opened on the outer surface of the front diffuser end. A front diffuser flow channel is opened inside the front diffuser end and is connected to the diffusion windows. This utility model has the advantages of high structural strength and good diffuser rectification effect.