94results about How to "Constant flow rate" patented technology

The invention relates to smoke treatment, in particular provides a clearing device for smoke pollutants of a glass kiln and a clearing method thereof. The clearing device is suitable for the glass kiln with high smoke temperature, smaller smoke amount, high clearing efficiency, stable system operation, simple structure and small floor area and is provided with an afterheat recovery boiler, a reaction tower, a bag dust collector, a circulating fluidization flume, a clean smoke recirculating flue, an absorbent bin and a feeding air flume which are sequentially connected. The clearing method comprises the following steps: smoke emitted by the glass kiln enters the afterheat recovery boiler; original smoke emitted by the afterheat recovery boiler enters a high-temperature reaction region of the reaction tower for premixing treatment with an absorbent, is accelerated by a Venturi accelerating region before entering a circulating fluidization reaction region and is cooled and purified before entering the bag dust collector; the purified smoke emitted from the reaction tower firstly enters the bag dust collector to remove particles and is emitted to a chimney by a draft fan in a purification chamber; and reaction dust emitted by the reaction tower is collected by the bag dust collector and is returned to the high-temperature reaction region.

The invention relates to a gravity drive microfluidic device for preparing a monodispersed emulsion and a method thereof, which is characterized in that a microfluidic system is driven by utilizing the constant flow rate generated by means of the constant gravity action of fluid columns with different heights based on the microfluidic device; liquid drops with different and even volumes are formed by utilizing the action of a shearing force, the surface tension and the like of the continuous phase fluid to the dispersed phase fluid; and microspheres meeting the requirements on bioanalysis and carriers of proteins, genes, medicine screening and the like are formed by solidification, drying or ultraviolet irradiation polymerization. The device of the invention comprises a microfluidic control device support component, a constant sample introduction component, a fluid pipeline, a microfluidic control channel component and a continuous sample adding component, wherein the heights of two-phase liquid columns are automatically controlled by controlling a two-phase mechanical motor; the liquid columns with different heights drive the fluid to generate the constant speed; the continuous-phase fluid for driving the microfluidic control device is used for shearing the dispersed phase liquid to prepare the liquid drops with the different volumes; and the large-scale and continuous preparation of the liquid drops can be realized by the continuous sample adding component and the constant sample introduction component.

The present invention relates to a large freezing test model box and large freezing simulation test platform. The platform comprises: a groundwater circulation system, a formation simulation system, arefrigeration cycle system and a monitoring system, therein the formation simulation system is used to simulate distribution of different soil layers, the groundwater circulation system is used to simulate different groundwater flow rates, and the refrigeration cycle system is used to simulate the formation freezing construction scheme under different working conditions, and the monitoring systemis used to record a change trend of each monitoring quantity during a freezing process. The large freezing test model box and simulation test platform can simulate groundwater flow in a test soil layer to the greatest extent, analyse temperature field expansion and variation law through automatic data acquisition and processing, and study forming process of frozen walls (curtains) or bottom plates, determine thickness control variables, and obtain relationship between groundwater flow rate and freezing temperature field and freezing design parameters, and optimize freezing design scheme, andpropose corresponding measures.

Diecasting machine for production of mouldings from thixotropic metal billets, containing a sprue system which connects a cylindrical casting chamber cavity with a moulding cavity, where the sprue system has a cylindrical sprue cavity immediately adjacent to the casting chamber cavity and contains at least one sprue, and all sprues lead laterally away from the generated surface of the sprue cavity and each sprue has a concentric center line and at its end facing towards the moulding cavity has an inlet opening for introduction of the thixotropic metal alloy into the moulding cavity, and the sprue system is connected to the casting chamber cavity by a passage opening perpendicular in relation to a concentric longitudinal axis of the cylindrical casting chamber cavity, wherein each sprue has a circular or elliptical cross section with a substantially constant cross sectional area over its entire length.

The invention relates to a full-automatic quick measurement system and method for water quality hexavalent chromium. A first electromagnetic valve is connected with a hexavalent chromium standard solution and a second electromagnetic valve and then is connected to a first joint of a six-way valve through a peristaltic pump; the second electromagnetic valve is connected with a standard sample; a second joint of the six-way valve is connected with a fifth joint through a quantifying ring; a sixth joint of the six-way valve is connected with waste liquid; a third joint of the six-way valve is connected to current carrying liquid through the peristaltic pump; a fourth joint of the six-way valve is connected with one end of a reaction pipe and a development agent passing through the peristaltic pump respectively through a three-way mixing machine; a third electromagnetic valve is connected to the other end of the reaction pipe and air respectively; and the third electromagnetic valve is also connected to the waste liquid through a photoelectric detection device. The full-automatic quick measurement system has the advantages of simple flow path design, pure digital photoelectric detection, bubble interference elimination and the like; and furthermore, a programmable logic controller (PLC) is used, so that the fault rate of an instrument control system is greatly reduced, and an instrument can really carry out unmanned full-automatic measurement.

The invention discloses a humidifying process for high-moisture charged coking coal. The process comprises the following steps of: pre-humidifying the high-moisture charged coking coal; sieving coal particles; smashing and separating large-particle coal; humidifying charged coking coal; recycling a low-grade heat source; and dedusting and pelletizing. The humidifying process has the advantages of high humidifying performance, large humidifying range, low energy consumption, low air pollution and convenience for maintaining and repairing.

The invention discloses a miniature measurement and control system fit for a high-field asymmetric waveform transference tube. The system comprises a man-machine interaction module, an upper computer system and a measurement and control circuit module, wherein the measurement and control circuit module comprises a plurality of sub-circuit modules; an operator sends an operation command and observes a detection result through a friendly instrument operation interface provided by the upper computer system and the man-machine interaction module; the upper computer system is connected with the sub-circuit modules in the measurement and control circuit module; and the sub-circuit modules are connected with corresponding components in the high-field asymmetric waveform transference tube to generate measuring signals necessary for detecting substance ingredients of the high-field asymmetric waveform transference tube and detect a signal output by the high-field asymmetric waveform transference tube at high precision. The miniature measurement and control system provided by the invention is fit for high-field asymmetric waveform transference tubes with different sizes and manufactured by various techniques, and the system has the advantages of low noise, high integration degree, good reliability and anti-interference capability, and quick and simple operation, and the like.

The invention provides a device and method for detecting the performance of functional material activated water, which relate to water treatment. The device mainly comprises six parts including a raw water storage tank, a water treatment bed, an activated water storage tank, a detection and control unit, a water quality detection and control unit and a data processing unit, wherein the potential of hydrogen (pH) values and the oxidation reduction potential (OPR) of raw water and activated water are detected in real time in an on-line way by a raw water pH electrode and a raw water ORP electrode as well as an activated water pH electrode and an activated water ORP electrode; detected data is transmitted into the data processing unit by the water quality detection and control unit; and a real-time data curve and a history data curve can be displayed after data analysis and operation, and test results can be obtained. The device and the method can simply and rapidly detect the performance of the functional material activated water, so that materials with excellent performance for activating animal drinking water can be screened out.

The invention provides a circulating water heating system of a secondary pump, consisting of a heating medium water inlet pipe, a heating medium water return pipe, a heat exchanger, a primary pump, a secondary pump, a bypass flow water mixer, a temperature control valve, a control cabinet and a tail-end heat user. The circulating water heating system is characterized in that the heating medium water inlet pipe is connected with a primary side inlet of the heat exchanger through the temperature control valve; the heating medium water return pipe is connected with the primary side outlet of the heat exchanger; a secondary side outlet of the heat exchanger is connected with a primary water inlet of the bypass flow water mixer through the primary water supply pipe; the primary water outlet of the bypass flow mixer is connected with the primary pump through the primary water return pipe and than is butted with a secondary side inlet of the heat exchanger. The invention adopts the primary pump constant flow and the secondary pump constant flow to operate so as to ensure that the system can automatically adapt to the load change of the tail-end heat user, controls the water supply temperature of the primary water supply pipe by matching outdoor temperature variation, and has the characteristics of reasonable design, reliable operation, high efficiency, energy saving, capability of automatically adapting to the flow variation of the secondary side tail-end heat user, and the like. The invention is particularly suitable for large and medium circulating water heating systems.

A heat exchanger is configured to have quadrant shaped baffles positioned at an angle to a longitudinal axis of shell for guiding cross-flow of fluid into a helical pattern while maintaining substantially uniform velocity of the cross-flow. Each of the quadrant-shaped baffles has a pair of flanks converging toward one another from a respective outer edge, which has spaced apart extending end portions each overhanging a respective one of the pair of flanks and configured to overlap the extending portion of an adjacent quadrant-shaped baffle in the desired position of the quadrant-shaped baffles. The extending end portions each are provided with at least one of the plurality of holes aligned with a respective hole of the extending portion of the adjacent quadrant-shaped baffle in the desired position of the quadrant-shaped baffles, wherein as the holes formed in the extending portions of the adjacent baffles are traversed by a respective pipe to secure the desired position of the quadrant-shaped baffles.

The invention relates to the field of hot forming, and discloses a method for producing a hot-forming part with variable strength and a lower die base of a die. The method comprises the steps that a plate material which is fully austenitized is put into the die for producing the hot-forming part to be stamped; in the stamping process, the area, needing to be machined to be in high strength, of the plate material is rapidly cooled to the temperature less than T<3> DEG C under the condition that the cooling rate V<1> is larger than the critical quenching rate V of the plate material, and the high strength area only provided with martensite microstructures is obtained; the area, needing to be machined to be in low strength, of the plate material is cooled to be within the preset temperature ranging from T<4> DEG C to T<5> DEG C under the condition that the cooling rate V<2> is smaller than V, and the low strength area which is simultaneously provided with austenite, bainite and / or pearlite microstructures is obtained; after the pressure is kept for a preset time period t<2>, stamping is completed, and the hot forming part with the variable strength is obtained. Compared with the prior art, according to the method for producing the hot-forming part with the variable strength and the lower die base of the die, the temperature control over the areas with different strength requirements in the part is flexible and effective, a transition area is narrow, and the situation of scrapping of the part can be avoided as much as possible.

The invention discloses a flow test device pressure and flow velocity double closed loop control system. A pressure control closed-loop system is formed by a constant temperature water tank, a water supply unit, a constant pressure control acquisition sensor, a pressure automatic control regulator and an upper computer. When work voltage of the pressure control closed-loop system deviates from the set pressure, the constant pressure control acquisition sensor transmits a pressure signal to the pressure automatic control regulator and the upper computer respectively. A flow control closed-loop system is formed by a gauge inspection device, a flow velocity state acquisition sensor, a straight stroke flow regulating valve, a flow velocity control performer and an upper computer. When work flow velocity of the flow control closed-loop system deviates from the set flow velocity, the flow velocity state acquisition sensor transmits a flow velocity signal to the flow velocity control performer and the upper computer. Water supply pressure and work flow velocity are ensured to be simultaneously constant or mutually supplementary so that control of reduced device size and accurate energy saving can be realized, and degree of stability of flow velocity of work medium water of the device is lower than 0.5%.

The intelligent cerebrospinal fluid replacing instrument consists of two parts, including a disposable replacing cylinder and a driving and controlling device capable of being reused. Inside the replacing cylinder with replacing port for the drainage pipe to be connected on and sucker, artificial cerebrospinal fluid is held. The driving and controlling device includes mainly a mechanical driving unit and an automatic control unit. The present invention has a program driven pushing and sucking pump with constant speed and constant displacement, and parameters capable of being set based on disease condition, so that it has intelligently controlled speed, time and pushing and sucking amount of the replaced cerebrospinal fluid and is scientific, accurate, safe and efficient.

The invention discloses a roasting flue gas heat recovery and dust suppression system of a zinc oxide production device. The roasting flue gas heat recovery and dust suppression system comprises a box body, wherein a flue gas inlet and a flue gas outlet are formed in the box body, a plurality of heat exchange assemblies are longitudinally arranged on the box body, each heat exchange assembly comprises a feed box, a discharge box and a plurality of heat exchange tubes which are used for communicating the feed box with the discharge box, all of the heat exchange tubes are positioned on the inner wall of the box body, cooling media respectively flow into each feed box, then flow to each heat exchange tube and flow out from each discharge box at last, and air mechanical force is regularly sent to shake off dirt and dust on the outer walls of the heat exchange tubes, so that dirtiness resistance is reduced, and the flue gas heat exchange effect is guaranteed. According to the heat recovery and dust suppression system, the plurality of heat exchange assemblies which are mutually independent are arranged on the box body, the heat of a part of flue gas is carried away by each heat exchange assembly, so that gradual cooling of the box body is realized, and a stable controllable temperature gradient field is formed in a heat exchange flue due to the change of the flue gas temperature, so that gradual dust suppression is realized, and the phenomenon that a pipeline is blocked by powdered zinc oxide which is suddenly cooled due to temperature jump is avoided. The roasting flue gas heat recovery and dust suppression system has the advantages of simple structure and reliability in operation.

The invention relates to a pulverized fuel burner and an entrained flow gasifier with several such burners for the production of synthesis gas, the burner connecting pieces are arranged for the supply of fuel dust and coolant on an outer double-walled sleeve, the one a central tube in radial distance concentrically surrounding and to the central channel an annular channel for the promotion of the combustion dust forming the burner mouth, the burner has 1 connection port for an oxidizer, and for cooling water at double central tube for the promotion of the oxidizing agent to the burner mouth. The invention provides a pulverized fuel burner for the production of synthesis gas with a higher wear resistance, low tendency to clog and optimal mixing of pulverized fuel and oxidant to be created, which is suitable for use in an entrained flow gasifier. According to the invention of the pulverized fuel supply to the burner mouth underneath an opens tangentially inlet opening for the pulverized fuel in the annular channel a distributor with several annular sections circumferentially distributed funnel-like depressions with outlet available, each outlet opening in an axially parallel straight pulverized fuel channel with approximately rectangular cross-section within the annular channel opens, wherein the cross-sectional area of the pulverized fuel channels together corresponds to the cross-sectional area of the inlet opening for the pulverized fuel, said pulverized fuel channels open into a spiral plenum front of the burner mouth defined by an upper coil, which the spaces of the annular channel between the outlet openings of the pulverized fuel channels closes, a parallel to bottom coil to swirl generation in the pulverized fuel flow and a two helices interconnecting web is limited.

The invention discloses an efficient hydraulic circulation clarifier and aims to provide a circulation clarifier which is high in operation stability, reduces chemical and energy consumption, can better adapt to changes of water volume and water quality during actual operation and reduces operation cost of water treatment facilities. The efficient hydraulic circulation clarifier adopts a method implemented according to the following steps: firstly, raw water enters a water inlet pipe at the clarifier bottom, is sprayed into a Venturi tube at a high speed through a spray nozzle and a horn mouth, so that vacuum is formed near the horn mouth in the lower part of the Venturi tube and sucks a large amount of backflow sludge, the backflow sludge and the raw water mix and react fiercely in the Venturi tube, and then a product enters a first flocculation basin and a second flocculation basin; a sludge and raw material mixed solution overflowing from the second flocculation basin is subjected to sludge-water separation in a separation chamber in a settling region, clear water moves upwards and is collected by a water collection tank and drained outward, one part of the settled sludge enters an automatic sludge discharge pipe, and the other part of the settle sludge is sucked by the Venturi tube, enters a reaction system and is recycled continuously.

The invention discloses a high pressure injected air oxidation heat effect detecting and tracking experimental device and a method. The device comprises an injection system, an experimental model system, a data collecting and controlling system, a gas phase output system, a liquid phase output system, a gas phase analysis system, a liquid phase analysis system, a personal computer (PC) controlling system and a constant temperature oven, wherein one end of the injection system is connected with the controlling system, the other end of the injection system is connected with the inlet end of the model system; the output end of the model system is connected with the gas phase output system used for collecting residual air samples and the liquid phase output system used for collecting oxidized oil samples; the gas phase output system and the liquid phase output system are arranged in a parallel connection manner; the output end of the gas phase output system is connected with the gas phase analysis system; Oil samples collected by the output end of the liquid phase output system is connected with the liquid phase analysis system; temperature probes on two ends of the experimental model system and a heating band at the inner internal wall of the experimental model system are respectively connected with the data collecting and controlling system. The experimental model system is evenly provided with the temperature probes, the heat effect change at the internal part of an oxidation tube can be detected in real time by the data collecting and controlling system, so that the accuracy of result analysis is ensured.

The invention relates to a device and method for measuring the infiltration rate of a sponge applied to green space construction of a sponge city. The device comprises a Mariotte flask (3), a percolation column (9) and a latex air bag (16), wherein the percolation column (9) is internally provided with a perforated partition plate (10) used for placing a sponge to be measured; the top of the percolation column is opened and is provided with a sealing plug (8) connected with the Mariotte flask (3) and the latex air bag (16); and the bottom of the percolation column connected with a measuring cylinder (13) through a liquid outlet tube (12). The sponge to be measured is placed on the perforated partition plate (10) in the percolation column (9); the percolation column (9) is filled with air through the latex air bag (16) and is then filled with water; after the surface of the water is higher than the surface of the sponge to be measured, the percolation column (9) is connected with the Mariotte flask (3), and the air inlet hole of the Mariotte bottle (3) is aligned with the water surface in the percolation column (9); and then the infiltration rate is calculated according to the measurement parameters. Compared with the prior art, the device of the invention has the advantages of simplicity, low cost, easy operation and the like.

The invention discloses a constant flow injection pump system and a cell magnetic sorting device. The constant flow injection pump system comprises a first plunger pump, a second plunger pump, a first check valve, a second check valve, a third check valve, a fourth check valve, a liquid outlet pipe and a liquid inlet pipe; the outlet of the first plunger pump is respectively connected with the inlet of the first check valve and the outlet of the second check value; the outlet of the first check value is connected with the liquid outlet pipe; the liquid inlet pipe is respectively connected with the inlet of the second check valve and the inlet of the third check valve; the outlet of the second plunger pump is respectively connected with the outlet of the third check valve and the inlet of the fourth check valve; the outlet of the fourth check valve is connected with the liquid outlet pipe. According to the constant flow injection pump system, liquid can be kept stable and constant in flow rate, and the flow rate can be regulated; the cell magnetic sorting device is simple in structure, efficient and reliable, and is suitable for continuous high-capacity magnetic cell separation; the device integrates a target cell washing function, therefore sorting and washing are completed simultaneously, and high-quality continuous cell sorting can be realized.

A fuel injector comprising an injector body having a spray aperture; a pintle extending within the injector body for axial movement between a closed position and an open position; said pintle head comprising a tapered portion engageable against the valve seat of the spray aperture and a cylindrical portion upstream of said tapered portion, an annular channel being provided defining a first part of a flow passage upstream of the spray aperture, wherein a discontinuity is provided downstream of the annular channel and upstream of the spray aperture to generate cavitation when the pintle stroke exceeds a predetermined limit to thereby generate a virtual channel of constant cross section downstream of the annular channel whereby the flow rate of the fuel flowing through said spray aperture is substantially independent of the stroke of the pintle when the pintle is in its open position.

The invention relates to a gravity drive microfluidic device for preparing a monodispersed emulsion and a method thereof, which is characterized in that a microfluidic system is driven by utilizing the constant flow rate generated by means of the constant gravity action of fluid columns with different heights based on the microfluidic device; liquid drops with different and even volumes are formed by utilizing the action of a shearing force, the surface tension and the like of the continuous phase fluid to the dispersed phase fluid; and microspheres meeting the requirements on bioanalysis andcarriers of proteins, genes, medicine screening and the like are formed by solidification, drying or ultraviolet irradiation polymerization. The device of the invention comprises a microfluidic control device support component, a constant sample introduction component, a fluid pipeline, a microfluidic control channel component and a continuous sample adding component, wherein the heights of two-phase liquid columns are automatically controlled by controlling a two-phase mechanical motor; the liquid columns with different heights drive the fluid to generate the constant speed; the continuous-phase fluid for driving the microfluidic control device is used for shearing the dispersed phase liquid to prepare the liquid drops with the different volumes; and the large-scale and continuous preparation of the liquid drops can be realized by the continuous sample adding component and the constant sample introduction component.

The invention discloses a drip irrigation device used for integration of water and fertilizer. The drip irrigation device comprises a drip irrigation pipe and a sealing cover body, wherein a D-shapeddrip irrigation channel is formed in the drip irrigation pipe; a constant-pressure groove, a tooth-shaped flow limiting groove, a drip irrigation groove and a siphon compensation groove are further formed in the drip irrigation pipe; a water flow channel is formed in one side of a pressure balance partition plate; a through hole is formed in a water flow channel plate; a pair of extrusion springsare fixedly installed at the end, away from the drip irrigation groove, of the siphon compensation groove; a siphon balance hole communicates with a siphon balance ball arranged in the D-shaped drip irrigation channel, and clean water is poured into the siphon balance ball; and a first-level sleeve is inserted in a sealing sleeve in a movably mode. A flexible pressure film expands under the actionof pressure to be matched with the tooth-shaped flow limiting groove, so that the flow speed of the drip irrigation hole is guarantee; meanwhile, during irrigation, the drip irrigation groove is opened, during irrigation stopping, the drip irrigation groove is closed, and the siphon volume is compensated through volume expansion of the siphon balance ball; and the blocking phenomenon caused by backflow of liquid in a burette is effectively prevented.

An infusion pump includes an actuator having an output shaft; a pump actuator comprising a plurality of members (30a, 30b, 30c, 30d) in hinged communication with each other so as to form a parallelogram construction, the plurality of members being hinged to the output shaft, and having a length 1 actuator moved by the output shaft and in contact with tubing, such that the pump actuator at an output shaft actuated distance x creates flat contact areas with the tubing, and wherein remaining non-contact areas of the tubing are at least substantially circular in shape; and a logic implementer configured to use at least two relationships to solve for a same number of variables to calculate a cross-sectional area of the tubing at an output shaft actuated distance x.

The invention discloses a hydrogen fuel cell metal bipolar plate resistant to long-term corrosion, which comprises a metal bipolar plate with plating layers on the surface, and the plating layers are a Cr plating layer, a CrN plating layer and a CrTiCN plating layer in sequence from inside to outside on the surface of the metal bipolar plate. The corrosion-resistant coating still has excellent corrosion resistance under a long-term corrosion condition, and meanwhile, the contact resistance of the corroded coating is kept in a low state.

The invention belongs to the field of medical instruments and particularly relates to a proportional valve for non-invasion ventilators. The proportional valve comprises a valve body, a head cover, a valve spool and a motor. The head cover is disposed at the bottom of the valve body, and the valve spool and the motor are accommodated inside the valve body. Guide channels are arranged on the valve spool along the circumferential direction, two ends of each guide channel are the closed, and a position sensor is arranged on the side wall of the cavity of the valve spool; an air inlet valve hole, an air outlet valve hole and an exhaust valve hole respectively communicated with the corresponding guide channels are arranged in the valve body, a detector is arranged at the position of the outlet of the air outlet valve hole, and the position sensor and the detector are respectively electrically connected with an intelligent control circuit; the valve spool is driven to rotate through the motor, and conversion of the proportional valve under the states of complete air outlet, complete exhaustion and half opening and half closing can be realized by connecting or disconnecting the guide channels with the air inlet valve hole in the valve spool. The proportional valve is simple and reasonable in structure and small in size; size of pressure or flow velocity tidal volume can be controlled in real time, noises during operation can be reduced, and pressure titration or the tidal volume can be accurately controlled and provided for a patient.

The invention discloses a special photooxygen catalytic device for waste gas treatment, the special photooxygen catalytic device comprises an upper mounting cover, a catalytic box, four supporting legs and a rotary table; the catalytic box is arranged below the upper mounting cover, and the four supporting legs are vertically arranged at the four corners of the bottom of the catalytic box respectively, the rotary table is arranged in the middle of the bottom of the catalytic box, and the upper mounting cover is of a hollow structure. The special photooxygen catalytic device has the beneficialeffects that a plurality of rotary plates are used for respectively introducing waste gas, so that the waste gas can be uniformly dispersed in the catalytic box through air outlet holes, motors II ona plurality of ultraviolet lamp panels are matched to drive a plurality of lamp tubes on the two sides to swing up and down in a reciprocating manner, motors I drive the plurality of lamp tubes to rotate continuously, the angle and the position range of the waste gas being irradiated by the lamp tubes are expanded, and the ultraviolet lamp panels are enabled to irradiate ultraviolet rays to the waste gas more comprehensively, so that the waste gas is oxidized and deodorized and sterilized more comprehensively and thoroughly; the device is convenient to operate, firm and durable, has good social benefits and is suitable for popularization and application.

The invention relates to a static warming isolation heat exchange device of an internal combustion locomotive. The static warming isolation heat exchange device of the internal combustion locomotive comprises a heat exchange heat source pipeline, a locomotive warming pipeline, a heat exchanger, a circulating pump, a regulating valve and a master controller, wherein the static warming isolation heat exchange device of the internal combustion locomotive is connected onto a ground warming heat source main system through the heat exchange heat source pipeline, the locomotive warming pipeline is connected onto a locomotive water system, the heat exchange heat source pipeline and the locomotive warming pipeline are both connected onto the heat exchanger, the circulating pump is connected onto the locomotive warming pipeline, a communicating pipe provided with the regulating valve is installed between the heat exchange heat source pipeline and the locomotive warming pipeline, and the circulating pump and the regulating valve both work under control of the master controller.

The invention discloses feeding equipment for producing polyethylene fibers. The feeding equipment comprises a feeding kettle. A polyethylene powder and solvent mixed liquid input pipeline is connected to the top of the feeding kettle, a polyethylene powder and solvent mixed liquid output pipeline is connected to the bottom of the feeding kettle, and a polyethylene powder and solvent mixed liquid circulating pipeline is further connected to the feeding kettle. The inlet end of the polyethylene powder and solvent mixed liquid circulating pipeline is communicated with the bottom of the feeding kettle, the outlet end of the polyethylene powder and solvent mixed liquid circulating pipeline is communicated with the top of the feeding kettle, and a circulating pump is arranged on the polyethylene powder and solvent mixed liquid circulating pipeline. Compared with an ultrahigh molecular weight polyethylene fiber feeding device used at present, due to the fact that the material circulating pump is added, material accumulation on the bottom in a cavity of a kettle body is avoided, and shearing stress is reduced.

The invention discloses a conveying device capable of passively adjusting flow. The conveying device comprises a pipeline, a transmission mechanism and a flow adjusting assembly; an annular opening isformed in the inner wall of the pipeline; the transmission mechanism comprises an annular driving cavity, a driven cavity and a connecting channel communicating the annular driving cavity and the driven cavity, the annular driving cavity, the driven cavity and the connecting channel are filled with a flowing medium, the inner side wall of the annular driving cavity includes an extrusion deformation piece, and an annular opening is sealed; the flow adjusting assembly comprises a moving part and a plugging barrel, the plugging barrel is plugged at the position, located in the downstream of theextrusion deformation piece, in the pipeline, a plurality of circulating holes are formed in the plugging barrel, and the moving part is movably connected to the plugging barrel; and an elastic telescopic part is arranged on the driven cavity, and the extrusion deformation piece drives, through the extruded stroke, the moving piece to shield the circulation hole. According to the conveying device,adjustment of pulse liquid flow or air flow is passively achieved through the transmission mechanism, and the relatively-constant flow speed and flow are obtained.

The invention relates to a method for preparing p-cymene from dipentene. The method comprises the following steps of: S1, continuously introducing nitrogen into a fixed bed reactor, wherein a catalystbed layer is arranged in the fixed bed reactor, and the catalyst bed layer is theta-ring filler loaded with a powdery catalyst; S2, vaporizing dipentene at 180-220 DEG C to form steam, introducing the steam into the fixed bed reactor, filling the fixed bed reactor with the steam, and vacuumizing, wherein the temperature in the fixed bed reactor is 180-240 DEG C, and the vacuum degree is 0.04-0.095 MPa; and continuously introducing the steam into the fixed bed reactor to carry out catalytic dehydrogenation reaction to obtain p-cymene. According to the method, high-purity p-cymene can be simply, efficiently and continuously prepared, and the content of p-cymene is 92% or above.