133results about How to "Reduce back flow" patented technology

The invention relates to a flexible tubular solid liquid processor, with filter, heat exchange and thermal extraction functions, wherein the filter element at least comprises one flexible tubular membrane unit, upper flange room and lower flange room; the hydraulic extracting system comprises pressure container, extract pump and tubes; the material liquid of container can be filtered by the tubular filter membrane of membrane unit, and said material liquid can be used as work medium to extract the concentrated material liquid in the filter room of membrane unit and discharge filter slag; the pressure container or the filter room of membrane unit can be filled with medium to exchange heat, to realize thermal filter or extraction; the filter element is arranged on the bearing base inside the pressure container; the filter rotator can rotate the filter element to realize cross-flow filter; and the invention can be arranged with gas or water reverse tube and vacuum filter tube; the slag discharge system comprises slag discharger or tubular inner / outer membrane scraper, or vibration slag discharger, or compression slag discharger.

The invention relates to a small high-efficiency mud-water separation device used for supplying water to villages and small towns. The device comprises a mechanical flocculation area and a hydraulic flocculation area, a sedimentation area, an active mud residue concentration area, an active mud residue internal reflux tube / cylinder, an impeller lifting device, a water inlet and outlet system, a mud discharge system and the like. The main body of the device mainly comprises three layers of concentric cylinders; an inner cylinder is the mechanical flocculation area, the middle is provided with the impeller lifting device, and active mud residue at the bottom of a concentration chamber is lifted to the mechanical flocculation area by the internal reflux tube / cylinder arranged in the center of the bottom; the hydraulic flocculation area is formed between the inner cylinder and a middle cylinder, and is provided with a pore plate; the sedimentation area is formed between the middle cylinder and an outer cylinder, and is provided with a single-blade single-curve rotary sloping plate; and the bottom of the equipment is provided with a mud residue concentration chamber. The device has theadvantages of compact structure, high space utilization rate, small occupied area, mechanical flocculation area, easily controlled reflux quantity, low energy consumption, good effluent quality and the like, and has great promotion value.

To provide a disposable diaper in which, regardless of the concentration of water absorbent in the absorbent article and the configuration thereof, the liquid return quantity is reduced, and liquid can be captured at an excellent speed. While adjusting the absorption factor and surface tension of the water absorbent to within specific ranges, the water-containing gel-form cross-linked polymer obtained in the polymerization step is crushed to a specific weight-average particle diameter, and after drying has a liquid permeability improver added during or after surface crosslinking, thereby obtaining a water absorbent with excellent GCA (Gel Capillary Absorption) and FGBP (Free Gel Bed Permeability).

The invention discloses a method for treating waste water in aerobic and two-stage anoxic-aerobic ways. The waste water flows through a regulating tank, a primary aeration tank, a primary settling tank, an anoxic tank, a first-stage aerobic tank, a secondary settling tank, an aerobic tank, a second-stage aerobic tank, a triple settling tank, a coagulation reaction tank, a coagulation settling tank and a decolorizing tank in sequence, so that water is finally discharged within controlling indexes of the national standard. The anoxic tank, the first-stage aerobic tank and the secondary settling tank construct a first-stage anoxic-aerobic system; and the aerobic tank, the second-stage aerobic tank and the triple settling tank construct a second-stage anoxic-aerobic system. After treatment, the removing efficiencies of major organic pollutants, particularly ammonia nitrogen and total nitrogen in the coal chemical industry are increased greatly; due to the arrangement of a two-stage anoxic-aerobic system, the reflux amount of a nitration liquid is reduced, system energy consumption is lowered, and the removing efficiency of total nitrogen is increased greatly simultaneously; and due to the arrangement of a coagulation, decolorizing and reaction unit, the COD (Chemical Oxygen Demand) of discharged water is further lowered, and decolorizing, sterilizing and deodorizing functions are realized.

The invention discloses an intelligent center-drive single-pipe suction dredge comprising a sludge concentration signal acquisition device, a controller, an electric actuating mechanism and a sludge discharge valve which is arranged in a sludge discharge channel, wherein, the sludge concentration signal acquisition device is used for acquiring the sludge concentration state in an acquisition sludge discharge well and outputting a sludge concentration signal into the controller, and the controller is used for judging the sludge concentration state and controlling the electric actuating mechanism to regulate the opening degree of the sludge discharge valve to be directly proportional to the sludge concentration signal. The intelligent central transmission single pipe suction dredge has the advantages that the intelligent center-drive single-pipe suction dredge changes the traditional control mode of artificially regulating the sludge discharge valve to regulate the sludge discharge amount, thereby allowing the operation of a system to be more in line with the dynamic changing law; and the intelligent center-drive single-pipe suction dredge realizes the purpose of stabilizing the sludge discharge concentration within a higher scope of 10 to 12g / L, thereby lowering the return sludge volume of a biochemical system and reducing the energy consumption of a sludge return system by 30 to 50 percent, and the energy consumption of a whole municipal sewage treatment plant can even be reduced by about 2 to 4 percent.

The invention discloses an ethyl acetate synthesis method utilizing membrane separation dehydration. Ethyl alcohol and acetic acid are reboiled and then enter an esterification kettle so as to carry out esterification reaction in the presence of a catalyst; a reaction product enters an esterification tower so as to be separated; a gas phase is distilled off from a tower top, condensed and layeredthrough a layering tank so as to extract ethyl acetate; the ethyl alcohol is vaporized by evaporation, then enters a raw material pervaporation permeable membrane assembly so as to be dehydrated, andis then fed into the esterification tower so as to be reacted with the acetic acid; crude ethyl acetate is vaporized by evaporation, then enters an esterification pervaporation permeable membrane assembly, and is then divided into two parts; one part reflows to the esterification tower so as to be used as a water-carrying agent, and the other part enters a refining tower so as to be refined, so that purified ethyl acetate is obtained. According to the ethyl acetate synthesis method utilizing membrane separation dehydration provided by the invention, a pervaporation membrane method is adopted for removing moisture of the raw material ethyl alcohol and a coarse ester on the top of the esterification tower without the limitation of azeotropy, no third component is introduced, the yield and the product purity are ensured, a craft process is simple, the continuous operation is realized, and the energy consumption is low.

The invention relates to a combined valve. The combined valve comprises a multifunctional valve, a confluence plate and at least one operation reversing valve, wherein a left opening and a right opening at one side surface of one operation reversing valve are respectively connected to a left cavity and a right cavity of a piston cylinder; a left reflux opening, a middle inlet and a right reflux opening at the other side surface of the operation reversing valve are respectively connected to a left flow channel, a middle flow channel and a right flow channel of the confluence plate; the channels of the left reflux opening and the right reflux opening of the operation reversing valve are respectively provided with a one-way valve; the left reflux opening and the right reflux opening are corresponding connected to a left flow channel and a right flow channel of the confluence plate through respective throttle valves; and the left inlet and right inlet of the multifunctional valve are respectively and correspondingly communicated with a left outlet and a right outlet through respective throttle valves. The combined valve avoids mutual influence among cylinders and collision abrasion to a piston and a cylinder end cover when the piston moves rapidly, prolongs the service life of the piston cylinder efficiently, and guarantees operation safety and stability of the piston cylinder.

The invention discloses a control method for preventing a multi-unit air conditioner screw compressor from liquid impact. The method comprises the following steps of: (1) closing each electromagnetic valve and closing an electronic expansion valve of each indoor unit when an air conditioning unit is electrified and stands by; (2) when oil temperature of an oil sump reaches a set oil temperature, opening a master liquid supply electromagnetic valve, opening a liquid supply electromagnetic valve on a liquid supply pipe of an indoor unit which receives a power-on instruction, opening the electronic expansion valve of the indoor unit, and loading the screw compressor in a gradient way until the screw compressor is fully loaded; (3) opening an electromagnetic valve on a gas-liquid separator oil return pipe when the total load of the indoor unit is in a partial load condition; (4) closing a liquid supply electromagnetic valve and the electronic expansion valve on the corresponding liquid supply pipe when a certain indoor unit is stopped; and (5) when the indoor unit is stopped, closing the master liquid supply electromagnetic valve, closing the electromagnetic valves and the electronic expansion valves on the liquid supply pipes of all the indoor units, and then stopping the screw compressor. Compared with the conventional method, the method has the characteristic of avoiding liquidimpact phenomenon, along with high operation stability and safety.

The invention discloses a thermoelectric refrigerating unit which comprises a semiconductor thermal arm and an electroluminescence body at the outer edge of the semiconductor thermal arm. A first direct-current power source is connected with the semiconductor thermal arm and the electroluminescence body to achieve luminescence refrigerating. A second direct-current power source provides drive current, and the current passes through a thermal release end electrode, the semiconductor thermal arm, a thermal absorption end electrode and the thermal release end electrode to form a loop. The thermal absorption end of the semiconductor thermal arm is connected with a thermal absorption end metal electrode, the thermal release end of the semiconductor thermal arm is connected with a thermal release end metal electrode and connected with a metal thermal sink through thermal conduction silicone grease, and the metal thermal sink carries out thermal radiation outwards. According to the thermoelectric refrigerating unit, phonons in thermoelectric materials are absorbed through electroluminescence, the reflux quantity of phonons in the thermal arm can be effectively reduced, and therefore the refrigerating efficiency of the thermoelectric refrigerating unit is improved.

The invention relates to a structure of a reversing valve. The reversing valve comprises a control reversing valve and an action reversing valve, and two groups are matched to realize flow velocity variable control over a pressure medium. Compared with the prior art, the structure of the reversing valve has the advantages that: through a design of a second valve rod and two overflow valves, when a piston moves to be about to contact the end of a piston cylinder, the reflux quantity of the pressure medium is reduced, and the motion resistance of the piston is increased, so that the motion velocity of the piston is reduced, the piston slowly touches the end of the piston cylinder, the piston and the end of the piston cylinder are prevented from being collided and worn when the piston moves at a high speed, the service life of the piston cylinder is effectively prolonged, and the operation safety and stability of the piston cylinder are ensured simultaneously.

The invention provides a furnace, in particular to an energy-saving float glass furnace which comprises a melting zone, a settling zone, a neck and a cooling part which are sequentially communicated, wherein the neck is provided with a deep separation device for molten glass; the deep separation device for the molten glass comprises at least a group of rectangular retaining walls, the two ends of the retaining walls are supported on pool walls at the two sides of the neck, and the bottom surfaces of the retaining walls are positioned between the 1 / 3 position and the 2 / 3 position of the neck in the depth direction from top to bottom; each group of the retaining walls comprise N numbered fire-proof bricks and (N-1)*3 numbered fire-proof pin shafts, N is a natural number greater than or equal to 2, and every two adjacent fire-proof bricks are jointed through three fire-proof pin shafts which are arranged triangularly; the width of the neck is within 2.5m; the width of the cooling part is within 7m; the depth of a pool is 600-1000mm; and the area of the cooling part is less than 15% of the sum of the area of the melting zone and the area of the settling zone. The furnace has the advantage of better energy-saving effect.

The invention relates to a multifunctional valve and a multifunctional valve combination valve. The multifunctional valve and the multifunctional valve combination valve comprise a valve body, a valve cavity which is arranged in the valve body and a valve rod which is arranged in the valve cavity, wherein a middle inlet, a left inlet and a right inlet are arranged on one side of the valve body, the middle inlet is used for the entering of pressure mediums, the left inlet and the right inlet are used for the selective entering of the pressure mediums, a left outlet and a right outlet are arranged on the other side of the valve body, the left outlet and the right outlet are used for the discharging of the pressure mediums, and the left inlet and the left outlet and the right inlet and the right outlet are selectively communicated in a corresponding mode through the matching of the valve cavity and the valve rod. The multifunctional valve and the multifunctional valve combination valve are characterized in that the left inlet is communicated with a left cavity correspondingly, the right inlet is communicated with a right cavity correspondingly, and correspondingly, the left cavity and the right cavity are communicated with the left outlet and the right outlet through a left throttle valve and a right throttle valve. According to the multifunctional valve and the multifunctional valve combination valve, a piston can be slowly contacted with the end portion of a piston cylinder, the collision and the abrasion to a piston rod when the piston is moved rapidly are avoided, the service life of the piston cylinder is prolonged effectively, and meanwhile the operation safety of the piston cylinder and the stability of the piston cylinder are ensured.

The present invention relates to a constant water level sequencing batch type activated sludge treatment sewage system with a characteristic of multi-level A-O reinforced denitrogenation and phosphorus removing, and a method thereof. The system sequentially comprises an anaerobic cell, multiple stage anoxia-aerobic cells, and a facultative cell, wherein the rear of the facultative cell is dividedinto two branches, one branch is the first sequencing batch cell communicated with the first aerobic cell, and the other branch is the second sequencing batch cell communicated with the second aerobic cell. With the system of the present invention, the constant water level sequencing batch type activated sludge treatment sewage method is improved so as to enhance effects of denitrogenation and phosphorus removing.

The invention discloses a funnel-shaped valveless piezoelectric pump. The funnel-shaped valveless piezoelectric pump comprises a pump body and a piezoelectric vibrator; the pump body is provided with a Y-shaped longitudinal section and is a funnel-shaped pump body formed by rotating the Y-shaped longitudinal section around the longitudinal center symmetric axis of the Y-shaped longitudinal section, and a pump cavity penetrating through from the Y-shaped wide opening end to the Y-shaped narrow opening end is formed; the wide opening end of the funnel-shaped pump body is a fluid inlet end and is provided with at least one fluid inlet; the narrow opening end of the funnel-shaped pump body is a fluid outlet end and is provided with a fluid outlet; fluid blocking bodies are arranged along the inner side wall of the pump cavity; and the piezoelectric vibrator is fixedly or detachably installed at the wide opening end of the pump body. According to the funnel-shaped valveless piezoelectric pump, the funnel-shaped pump body is designed, and the fluid blocking bodies are arranged on the side wall of the pump cavity, so that a valveless piezoelectric pump structure of a pipeline valve and fluid blocking body valve composite structure is formed; and in the fluid sucking process, the forward and reverse flow resistance differences of the funnel-shaped pump body are further increased, and the fluid pumping effect can be more remarkably improved.

The invention discloses an energy-saving and yield-improving production method of ethyl acetate. The production method comprises the following steps of: heating and gasifying raw material acetic acid and ethanol and then feeding into a reaction kettle to react; recovering a bottom material in the reaction kettle according to a certain proportion with the total amount of fed materials to an evaporator to perform flash evaporation, wherein most of ester and alcohol in the bottom material which is subjected to flash evaporation are returned to the bottom of an esterification tower, and the ester phase of the rest bottom material is a large amount of acid and a part of water and is discharged through a pump from the bottom of the evaporator; conveying the treated bottom material to a heat exchanger through the pump for heating and then directly feeding into a dehydration tower to perform dehydration treatment; performing azeotropic distillation and recovering azeotrope formed by water and a dehydrant from the top of the esterification tower; condensing to split phase; discharging the water phase to a recovery tower for treatment; reflowing the oil phase to a dehydration tower; and newly returning acid which is discharged from the bottom of the dehydration tower to the reaction kettle to participate in esterification reaction. After the process is implemented, the water in the kettle is effectively reduced to further reduce the corrosion condition of the equipment, the energy of an esterification section is saved by 5-10 percent, the capacity can be increased by 10-20 percent, and the economic benefit is obvious.

The invention discloses a method for enhancing sewage nitrogen and phosphorus removal and saving energy and reducing consumption based on pulse aeration. On the basis of a traditional A2O process, different galleries or areas of an aerobic zone are partitioned, a central control system in a sewage treatment plant is used for controlling an air blower, a pipeline and an air valve of an aerating system, the aerobic zone is subjected to pulse aeration, an area in the aerobic zone is always in the low dissolved oxygen state, DO is smaller than 0.5 mg / L, meanwhile, other areas normally aerate to be in high dissolved oxygen state, that is, DO is 2-3 mg / L, different areas of the aerobic zone are alternatively in the low dissolved oxygen state, the time that each area is in the low dissolved oxygen state in one cycle is t / n; t is an aerobic zone hydraulic retention time, and n refers to the number of the galleries or areas; the pulse cycle is an aerobic zone hydraulic retention time; after the aerobic zone is subjected to intermittent pulse aeration, an alternative aerobic-anoxic environment is realized, the denitrification is enhanced, and the sewage treatment effect and the water quality are improved.

The invention relates to a device and method for preparing high-purity nitrogen monoxide from adipic acid production tail gases. The device comprises a compressor, an absorption tower, an adsorption device, a low-temperature rectifying tower and a low-temperature refining tower which are connected in sequence, wherein the low-temperature rectifying tower is provided with an intercondenser; airflow discharged from the adsorption device enters the low-temperature rectifying tower after being cooled through a heat exchanger; purge gases located at the top of the tower and treated by the intercondenser is delivered to a tail gas treatment system after the cold energy is recovered; a liquid flow at the bottom of the tower enters the low-temperature refining tower; high-purity N2O is obtained from the top of the low-temperature refining tower and is filled after cold energy is recovered; a pressurized absorption, pressurized adsorption and low-temperature rectification coupling method is adopted; and the low-temperature rectifying tower is internally provided with an intercooler, so that the process energy consumption is greatly reduced on the premise that the high purity of the product is ensured.

The invention discloses a wear-resistant lining plate for a large self-grinding machine / a large semi-self-grinding machine. The wear-resistant lining plate is characterized in that the bottom platesof a feeding end inner ring lining plate body, a feeding end middle ring lining plate body and a feeding end outer ring lining plate body of the wear-resistant lining plate are provided with first lifting strips which are increased in height correspondingly, and are provided with long strip bosses for increasing the wear resistance of the bottom plates correspondingly; a feeding end barrel liningplate body, a middle section barrel lining plate body and a discharging end barrel lining plate body are provided with second lifting strips with the sections of asymmetric structures; an outer ring ore pulp lifter is provided with large arc-shaped third lifting strips, long bolts and short bolts; a grid plate is provided with large arc-shaped fourth lifting strips, and an inner ring ore pulp lifter is provided with fifth long lifting strips and sixth short lifting strips which are arranged at intervals; and a discharging device is of an integral structure and is provided with seventh short lifting strips. According to the wear-resistant lining plate, the problem that in the prior art, the service life of a feeding end lining plate body is relatively low, the discharging efficiency of a grinding machine is low and the number of the lining plates is too large are effectively solved.

The present invention relates to a check valve and, more particularly, to a check valve comprising a main disk and a separate auxiliary disk, the main disk making a rapid closing operation, and the auxiliary disk, which has an area smaller than that of the main disk, making a slow closing operation, thereby reducing the velocity of a reverse flow inside a conduit, right before the disks are finally closed, and preventing a slam (a characteristic phenomenon wherein, when the disks are closed with a bang, an instantaneous increase in pressure wave raises the possibility of piping fracture and causes noise and vibration) of the disks and water hammer.

The present invention discloses a refluence and extraction method of rare earth and a rear earth complete separation art adopting the method, the rear earth complete separation art belongs to the rear earth separation art field. The technical proposal of the present invention is that lanthanon is divided into an easy-extraction group A and a hard-extraction group B, the lanthanon near to the separation cut position in the groups of A and B is A1 and B1 respectively, the lanthanon of large mass partition chosen from A1 and B1 is used as the refluence metal, one or two connected refluence and extraction are used for producing one rear earth water solution containing only the refluence metal. One part of the rear earth water solution containing only the refluence metal is used as the product liquid output, and one part is used as the refluence liquid making the refluence metal enter into the refluent and extractive feed liquid for the refluence and extraction and separation. By analogy, the process is ended up until the rear earth is separated fully. The present invention has the advantages of single extraction system, continuous production, short technological process, and high product pureness and rear earth yield.

The invention discloses a self-controlled type self-absorption centrifugal pump for a ship. The self-controlled type self-absorption centrifugal pump comprises a centrifugal pump body, an aspirator, a pressure-control pipeline and an aspiration pipeline, wherein a water inlet of the centrifugal pump body is in lap joint with the aspirator; and the aspirator comprises a liquid-level switch, a jetting pump, a pressure-control switch, a solenoid valve and a pneumatic pump. A power source of the jetting pump is compressed air; and the pressure-control switch of the jetting pump separately communicates with the liquid-level switch and the solenoid valve. The two ends of the pressure-control pipeline are separately connected with a water outlet of the centrifugal pump body and the pressure-control switch; and the two ends of the aspiration pipeline are separately connected with an external joint of an internal pump cover of the centrifugal pump body and the liquid-level switch. According to the self-controlled type self-absorption centrifugal pump for the ship disclosed by the invention, the aspirator and the centrifugal pump body constitute the self-absorption pump, so that the structure is relatively simple, the size is small, suction ability is remarkably improved, and artificial water injection is not needed before starting. Under this working condition, automatic control is easily realized, labor duty is not needed during a working period, and therefore, the self-controlled type self-absorption centrifugal pump is especially suitable for being matched with a fire-fighting water supply system of the ship.

An energy saving ultra clear glass kiln comprises a plurality of cooling forehearth limbs and a melting zone, a clarification zone and a neck that are successively connected. At least one neck is included, and each neck is connected to at least one cooling forehearth limb and provided with a molten glass deep separation apparatus. One the one hand, each neck communicates with at least one cooling forehearth limb, namely a cooling transverse pathway is canceled, and a structure form of direct communication to the forehearth limb is employed; the cooling forehearth limb becomes an independent cooling portion, is in a small cooling portion arrangement and has little heat radiation; therefore, an area of the cooling portion is reduced, and molten glass flow in the cooling portion is smooth, and each ton of molten glass (discharge) accounts for 0.1-0.15m<2> of the cooling portion. on the other hand, the arrangement of molten glass deep separation apparatus compresses width of the neck, increases length of the neck, reduces a circulation section area of the molten glass at the neck, separates the molten glass in the neck and plays a role of reducing backflow of the molten glass. Thereby, the amount of the molten glass with obviously reduced temperature in the cooling portion flowing back to the clarification zone and the melting zone through the neck is effectively reduced, and liquid flow of the molten glass is much reasonable. The kiln has good energy saving effect.

The invention discloses a control method for the sludge discharge of a center-drive single-pipe suction dredge, and the control method controls the opening degree of a sludge discharge valve to be directly proportional to a sludge state signal according to the sludge state by detecting the sludge state and outputting the corresponding sludge state signal. The control method has the advantages that the control method changes the traditional control mode of artificially regulating the sludge discharge valve to regulate the sludge discharge amount, thereby allowing the operation of a system to be more in line with the dynamic changing law; the control is more accurate and direct by obtaining the on-line sludge state signal and regulating the opening degree of the sludge discharge valve, the sludge concentration can be stabilized within a higher scope of 10 to 12g / L by the control method, thereby lowering the return sludge volume of a biochemical system and reducing the energy consumption of a sludge return system by 30 to 50 percent, and the energy consumption of a whole municipal sewage treatment plant can even be reduced by about 2 to 4 percent.

The invention discloses an important factory water pump for a nuclear power station. Small grooves with different depths are arranged on the peripheral surface of a front sealing ring and a rear sealing ring of an impeller; the swing direction of each groove is opposite to the rotation direction of the impeller, so that the reflux quantity of liquid can be effectively reduced, and the volume efficiency of the pump is improved, thereby the purpose of the pump efficiency is achieved; a pump body is sealed by a packing seal device to be convenient and quick to overhaul and replace; a bearing is sealed by a lip-shaped skeleton sealing ring, and a lip thereof is outward and can effectively block a medium from entering a bearing body; a heat radiating fin is arranged on a bearing body at the position of a thrust bearing to increase the superficial area of the area, thereby effectively controlling the temperature of the bearing; a closing plate is additionally arranged at a window arranged on the bearing body for sealing to avoid the medium from entering a ball bearing; and meanwhile, a lip-shaped skeleton sealing ring is arranged on a pressure cover of an upper bearing to block the medium from entering the thrust bearing.

The present invention provides a dry flue gas desulfurizing process with independent feeding, feeding back and water-spraying device. It includes desulfurizing agent preparation digestion system, desulfurizing reaction tower and desulfurizing reaction system and exterior desulfurizing granules separation and recirculating system. The water-spraying atomization device of desulfurizing reaction tower, desulfurizing agent feeding device and granules recirculating feed back device are independently placed, and the different heights of the desulfurizing reaction tower are equipped with respective nozzles, so that the structure can raise the utilization rate of the desulfurizing agent and can raise the desulfurizing effect.

The invention provides a fractionation system and a fractionation method of a gasoline and diesel hydrogenation device. The inlet of the system is communicated with the reaction unit of the gasoline and diesel hydrogenation device, the outlet of the system is respectively communicated with a reforming device and a diesel product tank, and the system comprises a stripping tower, a first reflux tank, a first reflux pump, a fractionating tower, a second reflux tank, a second reflux pump, a first heat exchanger, a circulating pump, a reboiler, a booster pump, a steam generator and the like. The fractionation process comprises the following steps: low-fraction oil of the reaction unit enters the stripping tower, bottom oil of the stripping tower enters the fractionating tower, naphtha extractedfrom the top of the stripping tower and naphtha extracted from the top of the fractionating tower are converged and then sent to the reforming device, and diesel oil is extracted from the bottom of the fractionating tower. According to the fractionation system, the operation mode of the stripping tower is changed from total reflux to partial extraction, the reflux quantity of the stripping towercan be reduced by extracting part of naphtha from the top of the stripping tower, and the temperature of the bottom of the stripping tower and the feeding temperature of the fractionating tower are increased so that the treatment load of the fractionating tower is reduced, and finally the aims of saving energy and reducing consumption are fulfilled.

A liquid permeable surface sheet (3) comprises an upper layer non-woven fabric (20) which is provided at the skin side, and which is hydrophilic, and a lower layer non-woven fabric (21) which is provided at the non-skin side, and which is water repellent. A plurality of openings (22) are formed which pass through the upper layer non-woven fabric and the lower layer non-woven fabric. Accordingly, body fluid transfers smoothly through the openings to an absorbent body. The upper layer non-woven fabric at the skin side is made to be hydrophilic such that body fluid readily permeates therethrough.The lower layer non-woven fabric at the non-skin side is made to be water repellent such that the body fluid which has passed through is not readily absorbed again. Accordingly, the amount of returning body fluid can be reduced.

The invention relates to the field of household appliances, and discloses a closed impeller, a heating pump and a dish washing machine. The closed impeller (10) comprises a front cover plate (1), a rear cover plate (2) and multiple blades (3) which are centrally arranged and are spaced circumferentially, wherein the front cover plate is in a circular ring shape and is arranged on the upper part ofthe blade top surfaces of the blades, and the outer diameter of the front cover plate is smaller than the outer diameter of the blades; and projection of the multiple blades on the rear cover plate forms a circular ring projection area, and the radial distance between the outer periphery of the front cover plate and the outer periphery of the circular ring projection area is not smaller than onehalf of the annular width of the circular ring projection area. According to the closed impeller, the outer diameter of the front cover plate is set to be smaller than the outer diameter of the blades, so that the heating pump has both the better heat exchange efficiency and the better pump efficiency.

The invention relates to the technical field of glass kiln, and provides a plate glass kiln clarification section tank bottom construction method. A support layer is laid on the bottom of the glass kiln; a first pavement structure is tiled on the support layer; the first pavement structure comprises multiple levels of horizontal steps which rise gradually along a molten glass flowing direction; adjacent horizontal steps are connected through inclined surfaces; and along the molten glass flowing direction, a second pavement structure is laid at the end of the highest level of horizontal step, wherein the second pavement structure is connected with the end of the highest level of horizontal step. The entire tank bottom of the clarification section is step-like. With the construction method, the height of the clarification section tank bottom is lifted, such that the depth of molten glass at that section is relatively reduced. Also, the depth of a surface flow layer at that section is reduced, such that flowing molten glass can slowly flow to a cooling section along the step-like clarification section tank bottom. Molten glass reflux amount is effectively reduced, such that energy consumption is reduced, and clarification rate is improved.