305results about How to "Improve the perturbation effect" patented technology

The invention relates to a large-diameter earth pressure balance shield machine. The machine comprises a cutterhead, a cutterhead drive part, a propulsion oil cylinder, an erector, spiral conveyors and a frame; the cutterhead is a double-cutterhead which comprises a peripheral large cutterhead and an independent central cutterhead; the cutterhead drive part comprises two driving mechanisms which drive the peripheral large cutterhead and the independent central cutterhead respectively; and the peripheral large cutterhead and the independent central cutterhead rotate independently and bidirectionally. Compared with the prior art, the shield machine adopts the double-cutterhead design, greatly optimizes a cutting speed of the cutterhead on a soil body, further improves a propulsion speed of the shield, optimizes the disturbance effect of the cutterhead on the soil body, and prevents the rolling of a shield machine body; different opening rates are designed on the cutterhead and are suitable for different situations of a central part and a peripheral part when a tunnel is advanced; and three spiral conveyors discharge soil, effectively control the posture of the shield, and prevent the deviation of a tunnel axis.

The invention discloses an active power filter device based on a coupled inductance, which is composed of a signal acquisition module, a main control module, a drive module, a power conversion module and an LCL filter module based on a coupled inductance. The steps of extracting command current are as follows: first, extract sinωt and cosωt which are synchronized with grid A-phase voltage ua through digital phase-locked loop; secondly, transform the three-phase grid current into dqo coordinates to obtain current id, iq in dqo coordinate system , io; the third is to perform digital low-pass filtering on id and iq to extract their DC components; the fourth is to inversely transform io, sinωt and cosωt to dqo coordinates; the fifth is to perform subtraction to obtain the three-phase grid current The fundamental reactive and harmonic currents in . After hysteresis comparison control, PWM gating signals and trigger pulses are generated to control the orderly on-off of each IGBT in the power conversion module to generate PWM voltage, which is filtered by the filter module and then injected into the grid for compensation.

The invention relates to an immersed vacuum membrane distillation plant and a sewage treatment technology using the same. The immersed vacuum membrane distillation plant comprises a raw water storage tank, a gas dissolving pump, a raw water heating water tank, a membrane distillation hydrophobic membrane module, a condenser, a vacuum buffer tank, a vacuum pump, a water producing tank, a valve, a measuring instrument, and an automatic controller. The sewage treatment technology is characterized in that: raw water is subject to pH regulation, microfiltration and other pretreatment, then the pretreated raw water enters into the raw water storage tank, the sewage in the raw water storage tank is subject to gas-water mixing through the gas dissolving pump, and then the gas-water mixture enters into the raw water storage tank for heating to a specific temperature, membrane distillation is carried out at the specific temperature, the produced water after membrane distillation is directly reused, and a little thick water is treated concentrately. According to the invention, the use of the plant in sewage treatment reduces the effect of concentration polarization and temperature difference polarization in the sewage, reduces membrane pollution, increases the membrane distillation flux, prolongs the operation period of the membrane module, reduces the heat loss of the pipeline, and increases the heat utilization rate.

Variable-disturbance range polycarboxylate superplasticizer preparing equipment comprises a kettle body, a transmission device, a machine frame and a first rotating shaft, wherein mounting bases are symmetrically arranged on the outer side wall of the kettle body; lifting bodies are fixedly mounted on the mounting bases; the free ends of the two lifting bodies are jointly fixedly connected with amounting plate; the transmission device is fixed to the mounting plate through the machine frame; the transmission device is connected with the first rotating shaft positioned inside the kettle body.The variable-disturbance range polycarboxylate superplasticizer preparing equipment has the beneficial effects as follows: through stretch and retraction of the lifting bodies, lifting of the mountingplate is driven so as to drive the first rotating shaft to lift in the kettle body, and the first rotating shaft drives a stirring body to lift, so that the stirring range is changed and the stirringeffect is effectively improved; the first rotating shaft drives the stirring body to rotate, stirring bulges arranged on the stirring body stir and mix materials, and during rotation of the stirringbody, the materials enter and exit from through holes to form a turbulent flow, so that the mixing effect is further improved.

The invention discloses an internal threaded copper tube. The internal threaded copper tube comprises a tube body (1), wherein internal threaded teeth with different height and various tooth shapes are formed on the inner wall of the tube body (1) and are alternately distributed. Due to the difference of the tooth shapes and the height, the turbulent flow intensity of a coolant is increased, and disturbance on the coolant and heat conduction energy efficiency are improved. In the using process, the tooth shapes of the common internal threaded copper tube are damaged while the tube is expanded, and due to the difference of the tooth shapes and the height, only a part of tooth shapes of the internal threaded copper tube are damaged after the internal threaded copper tube is expanded, and the internal threaded copper tube still has high heat transfer efficiency. By using the optimized design, the weight, production cost and using cost of the tube can be reduced. The internal threaded copper tube is suitable to be widely used in the fields of refrigeration, air conditioning, power generation, sugar making, chemical industry, solar energy and the like.

The invention discloses an electrochemical synchronous nitrogen and phosphorus removal apparatus and a municipal sewage treatment method, and belongs to the technical field of sewage treatment. A dimensionally stable electrode, an iron electrode, an aluminum electrode, a magnesium electrode and a copper modified stainless steel electrode which are commonly used in an electrochemical water treatment technology are combined to realize the nitrogen and phosphorus removal treatment of the municipal sewage in a same electrolytic cell. The apparatus has the advantages of simple structure, operation convenience, high efficiency, stable indexes of discharged water, and realization of the large-scale automatic sewage treatment. The municipal sewage method has the advantages of simple technology, operation convenience, manpower and material resource saving, low energy consumption, high removal rate of sewage pollution indexes, and realization of the removal rate of each of the municipal sewage indexes comprising the chemical oxygen demand, nitrate nitrogen, ammonia nitrogen and total phosphorus to reach above 92%.

The invention discloses a low-nitrogen combustion technique based on circulating fluidized bed boiler. The circulating fluidized bed boiler comprises a boiler body, a cyclone separator, a deduster, an induced draft fan, a primary air supply system and a secondary air supply system which are connected in sequence. A smoke recirculation pipe is drawn out behind the induced draft fan. The primary air supply system and the secondary air supply system are connected to the smoke recirculation pipe in parallel. A burn-out chamber is arranged at an outlet of the cyclone separator. The low-nitrogen combustion technique based on the circulating fluidized bed boiler comprises the following steps that pulverized coal enters the boiler body under the action of primary air, specifically, the amount of smoke recirculation air in the primary air accounts for 8-10% the total air amount of the primary amount, and the amount of the primary air accounts for 40-45% of the total air amount; secondary air is introduced into the boiler body through the secondary air supply system, specifically, the amount of smoke recirculation air in the secondary air accounts for 12-14% the total air amount of the secondary air; fine flying ash enters the burn-out chamber; and over fire air is introduced into the burn-out chamber. According to the low-nitrogen combustion technique based on the circulating fluidized bed boiler, the burn-out chamber is arranged at the outlet of the separator, and part of smoke is mixed into the primary air and the secondary air, so that generation of NOx is reduced.

The invention relates to a device for waste heat recovery based on control over outlet smoke temperature. According to the device, a smoke adjusting baffle and a bypass flue are arranged in an original flue and a temperature sensor is arranged in the flue; the bypass flue is communicated with a smoke heat exchanger and the smoke heat exchanger is connected with a steam pocket; the steam pocket is communicated with an air heat exchanger in an air side flue through a saturated steam output pipe and the air heat exchanger is further communicated with the steam pocket through a condensate water input pipeline so that circulation can be formed; a condensate water circulation pump is arranged on the condensate water input pipeline; a liquid level sensor is arranged on the air heat exchanger; the steam pocket is provided with a steam pocket pressure sensor. The outlet smoke temperature is controlled by the adjusting baffle, smoke is shunted by the adjusting baffle, and therefore it is guaranteed that the temperature of the discharged smoke is stabilized at a set value; according to control over the steam pressure of the steam pocket, the backflow speed of condensate water is controlled to control the heat exchange area of a heat exchange system, and therefore control over the heat exchange power of the heat exchangers is achieved.

The invention discloses a venturi mixer with symmetrical inlet pipes at a throat part. The venturi mixer comprises a mainstream venturi pipe flow-in pipeline, a mainstream venturi pipe tapered section, the mainstream venturi pipe throat part, a mainstream venturi pipe diffusion section and a mainstream venturi pipe flow-out pipeline, wherein the mainstream venturi pipe throat part is symmetrically provided with a first inlet pipe, a second inlet pipe, a third inlet pipe and a fourth inlet pipe which are oblique toward the mainstream venturi pipe diffusion section, are communicated with the mainstream venturi pipe throat part and are centrally provided with open pores in which an inlet fluid flows. Compared with a traditional single inlet mode, the mode disclosed by the invention has the advantages that the inlet fluid can be distributed more uniformly; a mainstream fluid flows through the throat part, and converges with the inlet fluid at the center of the throat part so as to form intense reverse opposite impact, so that the influence to a mixing effect of a boundary layer is reduced fully, the turbulent effect increases, the mixing effect of the mainstream fluid and the inlet fluid nearby the central line is improved, the mixing efficiency is improved effectively, and the using range of the venturi mixer is expanded.

The invention relates to an integrated technique and special equipment for raw gas waste heat recovery and steam replacement with heat transfer soil. The integrated technique and the special equipment are mainly characterized in that high-temperature separation heat pipes are used to recover latent heat of high-temperature raw gas from a coking chamber, the recovered heat is transmitted to heat transfer oil, the heated transfer oil supplies required heat to various coking procedures of chemical production operational units (an ammonia evaporation procedure, crude benzene distillation and refining procedures, a coke distillation procedure), the heat transfer oil in a whole chemical production system cycles in closed loops, and temperature and flow are regulated and controlled according different requirements of the units on operational heat sources. Compared with the prior art, the integrated technique and the special equipment can be used for efficiently recovering high-quality waste heat of raw coke oven gas, energy consumption of the coking procedure is reduced, consumption of circulating ammonia water in spraying is reduced, heat transfer oil heating systems for the chemical production operational units and addition heat required by the heat transfer oil heating systems are omitted, and closed-loop circulation of the heat transfer soil and cascade use of the waste heat are achieved.

The invention relates to a rotary water-distributing type IC (internal circulation) anaerobic reactor. The rotary water-distributing type IC anaerobic reactor comprises a reaction tower, wherein the bottom of the reaction tower is provided with a water inlet, a water discharging opening is formed in the upper part of the reaction tower, and a water introducing and distributing device, a reflux water distributing device, an inner reflux pipe, a first three-phase separator, a second three-phase separator and a gas-water separator are arranged in the reaction tower from bottom to top sequentially; the upper end of the inner reflux pipe communicates with the gas-water separator, and the lower end of the inner reflux pipe is arranged towards the bottom of the reaction tower; the upper part of the first three-phase separator and the upper part of the second three-phase separator are each connected with a biogas collecting pipe which communicates with the gas-water separator, and the water inlet is connected with the water introducing and distributing device which comprises a main connecting pipe; and one end of the main connecting pipe is provided with two or more branch pipes which areradially arranged, each branch pipe is provided with a water inlet hole, and the water inlet holes all face to the counter-clockwise direction or the clockwise direction. In the way, sewage which is injected into the water inlet can be mixed with anaerobic bacteria-containing sludge in the tower evenly, so that the effect of mass transfer between the sewage and anaerobic bacteria is improved.

The invention discloses a command current extraction method and a compensating current generation method for an active power filter. The command current is extracted by a digital phase-locked loop method and the compensating current is generated by a hysteresis current control method, so that the real time of an active power filtering device is improved, and the capability of the active power filtering device of inhibiting the disturbance in a loop is enhanced and the performance of a system is greatly improved.

The invention relates to a dry circulating fluidized bed flue gas desulfurization reaction tower, belonging to the field of flue gas purification technology. Said invention includes tower body and flue gas inlet, flue gas outlet, spraying water inlet and spraying powder outlet which are connected with the tower body. Said tower body is composed of upper and lower two sections which are connected by means of designed Venturi section. The lower section of said tower body is preseparation chamber with buffer action, the connection form of the preseparation chamber and the described flue gas inlet adopts a tangetial gas-feeding turnable type structure, the bottom portion of preseparation chamber is equipped with a conical ash-falling mouth. The upper section of said tower body is a straight barrel section; the lower portion of said straight barrel section is connected with the described spraying powder inlet and spraying water inlet placed over the spraying powder inlet. In the interior of upper portion of said straight barrel section an internal separation member with inertial separation action is mounted, and the described flue gas outlet is placed over the internal separation member and connected with outer wall of said straight barrel section.

The invention relates to a solid material conveying pipeline, and in particular relates to a conveying pipeline capable of preventing materials from blocking. The material conveying pipe provided by the invention comprises an external pipe; one end of the external pipe is a feeding port; the other end of the external pipe is a discharging port; the upper pipe wall in the external pipe is fixedly fitted with an internal pipe; a material channel is formed between the external wall of the internal pipe and the internal wall of the external pipe; a plurality of flowing-aided through holes distributed along the length direction of the internal pipe are formed on the pipe wall of the internal pipe towards the material channel; and a flowing-aided plate passing through the flowing-aided through holes and stretching in the material channel is extended downwards from the upper pipe wall in the internal pipe. As the flowing-aided through holes and the flowing-aided plate are adopted, the material conveying pipe provided by the invention can effectively prevent blocking.

The invention provides an ultrasonic reinforced micro-channel heat exchanger. The heat exchanger comprises a shell, a water-cooling system, micro pin fins, an ultrasonic generator and an ultrasonic transducer, wherein the water-cooling system comprises a cooling water channel, a water inlet and a water outlet; the cooling water channel is arranged in the shell; the water inlet and the water outlet are connected with the cooling water channel to form the water-cooling system; the shell comprises a channel main body and an upper sealing cover; the channel main body and the upper sealing cover are connected in a sealing manner; the micro pin fins and the cooling water channel are arranged in the channel main body; the micro pin fins are arranged along the axial direction of the channel main body; the cooling water channel is formed in the spaces among the micro pin fins, and the spaces between the micro pin fins and the inner wall of the channel main body; ultrasonic transducer oscillators are distributed on the two sides of the channel main body; and the ultrasonic generator is connected with the transducer through a wire. According to the ultrasonic reinforced micro-channel heat exchanger, the ultrasonic generator is adopted to give out high-frequency signals to enable the transducer to generate ultrasonic vibration; an ultrasonic cavitation effect generated by the cooling water is changed into an ultra-turbulent flow state, so that the cooling effect is reinforced; and in addition, dirt in the channel can be cleaned at any time, and the heat transfer resistance is lowered.

The invention relates to the technical field of ceramic material production equipment, and discloses intelligent stirring equipment based on a ceramic material. The intelligent stirring equipment comprises a shell, the top of the shell is rotatably connected with a gear set, the middle part of the gear set is fixedly connected with a first rotating shaft, and the periphery of the bottom of the first rotating shaft is fixedly connected with spiral blades; and a second rotating shaft is rotationally connected into the gear set, an electromagnet is fixedly connected to the bottom of the second rotating shaft, a supporting base is fixedly connected to the periphery of the middle of the second rotating shaft, and a connecting rod set is hinged to the periphery of the supporting base. Accordingto the intelligent stirring equipment based on the ceramic material, during replacement, a pull rod is pulled up to release locking of a movable block to a filter screen frame to take out a blocked filter screen, the effect of replacing the filter screen at the edge is achieved, the practicability of the equipment is improved, the supporting bases at the top and the bottom are crossed to stretch and fold, the disturbance effect of water is enhanced, and intelligent adjustment makes stirring more uniform; and fine clods are prevented from influencing the surface quality of the ceramic.

The invention provides a heat exchanger fin. The heat exchanger fin comprises a plurality of fin units which are integrally connected in a certain manner; the sections of the fin units in the circulation direction of an outside fluid are approximately rectangular or trapezoidal; in the length direction of the fin, the adjacent fin units are connected by use of corresponding tops and corresponding first roots and second roots; in addition, the adjacent fin units are arranged in a ladder pattern, and gaps are formed between corresponding first sidewalls and corresponding second sidewalls; in the width direction of the fin, the adjacent fins are connected by use of the corresponding first roots and the corresponding second roots; an reinforcing element serving as a lug and/or a concave portion is integrally formed on one of the first sidewall and the second sidewall, so that the bearing strength of the fin units can be enhanced and the surface heat exchange area of the fin also can be increased; meanwhile, the reinforcing element is matched with the gaps to increase the turbulence between the fin and the fluid, and consequently, the heat exchange efficiency of the heat exchanger with the fin can be improved.

The invention provides a multi-stage indoor formaldehyde removing device with sterilization effect. According to the invention, a high-pass filter screen, a water vapor removing layer, a carbon dioxide removing layer, a steel mesh and a formaldehyde removing layer are sequentially installed between an air inlet and an air outlet; the high-pass filter screen is used for filtering dust particles andPM2.5 particles; the water vapor removing layer is made of a silica gel or molecular sieve, and the silica gel or molecular sieve is grown on activated carbon cotton or high-pass fibers; the carbon dioxide removing layer employs a metal organic framework material growing on the activated carbon cotton or high-pass fibers; the steel mesh is sprayed with nanometer silver ions and is provided with aplurality of uniformly-distributed ultraviolet lamps; and the formaldehyde removing layer is a metal organic framework material growing on the activated carbon cotton or high-pass fibers, and the metal organic framework material is doped with a photocatalyst. The multi-stage indoor formaldehyde removing device of the invention can remove PM2.5, dust, water vapor and CO2 gas step by step, therebyefficiently removing formaldehyde and achieving sterilization effect at the same time.

The invention belongs to water treatment equipment, and particularly relates to a spiral flocculator which comprises a support. At least two spiral plates with opposite turning directions are longitudinally arranged on the support at intervals, the upper end and the lower end of each spiral plate are rotationally assembled on the support, and strip-shaped blades are radially fixed onto outer edges of the spiral plates. The spiral flocculator is mounted between two adjacent partition boards in a folded plate type flocculation reaction tank when applied to the folded plate type flocculation reaction tank. The spiral flocculator solves problems of large application limitation, poor flocculation effect and large occupied area of an existing reaction tank in the prior art, and has the advantages that a disturbance effect to water flow is good, the occupied area of the reaction tank is small, installation is simple, energy is saved, and the like.

The invention relates to a hollow fibrous membrane reactor integrating a gas distribution function and an enzyme catalysis function and an application method of the reactor. A hollow fibrous membrane is used as a gas distributor, the hollow fibrous membrane for distributing the gas and a hollow fibrous membrane of an immobilized enzyme are assembled into a same component, the bottom end of the membrane component and the bottom ends of all fibrous membranes in the component are sealed, the top end of the membrane component and the top end of the hollow fibrous membrane of the immobilized enzyme are sealed, and the top end of the hollow fibrous membrane for distributing the gas is open and is used for introducing CO2 gas; the hollow fibrous membrane reactor is applied to a formate dehydrogenase (FDH) catalytic CO2 methanoic acid synthetic system, by controlling the upstream gas rate, the number of the hollow fibrous membrane for distributing the gas and the micro-structural parameters of the membrane, the quantity and the size of bubbles, the retention time and space distribution in a solution can be adjusted, so that the gas-liquid contact time and the gas-liquid contact area can be increased, the liquid phase can be effectively disturbed, the rapid and efficient dispersion and mixing between the gas phase and the liquid phase and inside the liquid phase can be realized, and the mass transfer effect can be improved.

The invention discloses a visible tea yellowing device and a yellowing method, and relates to the technical field of tea processing. The yellowing device comprises a rack and a rack-mounted yellowingcylinder, wherein a water tank for heating a lower cylinder wall is connected with the lower cylinder wall of the yellowing cylinder; a material inlet is mounted at the top part of the yellowing cylinder; a material outlet is mounted at the bottom of the yellowing cylinder; a rotary opening and closing door is mounted on the material outlet; a vent hole is formed at one end of the yellowing cylinder; a yellowing cylinder side door is mounted at the other end of the yellowing cylinder; a hollow shaft is mounted rotationally along the axial direction in the yellowing cylinder; a power device isconnected with one end of the hollow shaft; the other end of the hollow shaft communicates with the inside of a water tank by an air guide pipe; air flow holes are uniformly distributed in the hollowshaft; and a plurality of turning devices are mounted along the axial direction on the outer wall of the hollow shaft. By adopting the visible yellowing device disclosed by the invention, the internalenvironment of the yellowing cylinder can be easily adjusted and controlled, so a yellowing process of yellow tea is convenient in operation and uniform in yellowing effects, and the yellowing quality and performance of the yellowing device are improved.