40results about How to "Reduce back pressure" patented technology

The invention belongs to the technical field of oil and gas well development, and particularly relates to a shale gas well gas lift dredging method. According to the method, the gas lift pressure is obviously reduced to 40-60% through comprehensive means such as foam drainage liquid filling for reducing the gas well accumulated liquid density, short-time annular gas lift, wellhead return pressure reduction for the gas lift, oil jacket pressure balancing for reducing the hydrostatic liquid column height and alternate positive and negative lift, and multiple cooperation is conducted, so that the gas lift pressure is obviously reduced to 40-60%, the gas well recovery production progress can be accelerated, the gas lift effect is improved, and the gas well recovery efficiency is improved. The production recovery cost is reduced. In the process of lifting the deep shale gas well, gas well lifting can be achieved by optimizing gas lifting operation steps on the basis of existing gas lifting equipment, effective gas lifting can be achieved by means of the technical method under the influence of factors such as high temperature and high pressure, shaft corrosion and sand production of the deep shale gas well under different conditions, and the success rate reaches up to 80%.

The invention relates to the technical field of energy conservation and consumption reduction of coal-fired units, in particular to a novel energy storage type dry peak cooling system which comprises a peak condenser, a dry air cooling tower, a reservoir, a reservoir circulating pump, a cooling tower circulating pump and a DCS control center. And a corresponding instruction is made according to a comparison result after the back pressure threshold value is compared with a built-in back pressure threshold value. On the basis of the energy storage type design concept, cooling water resources are reasonably allocated and stored, the capacity requirement of the dry type air cooling tower is reduced, and the problem that the space in a plant is limited is solved; meanwhile, by adopting a mixed cooling mode of cold water of the dry-type air cooling tower and cold water of the reservoir, the temperature of the peak condenser is effectively reduced, the back pressure of the unit is further reduced, the on-load capacity of the unit is improved, and the unit can stably operate under nameplate output in the high-temperature period in summer; the problems that an original direct air cooling system is high in back pressure and limited in load in summer are solved.

The invention relates to a method and a system for integrally removing greenhouse gas and particulate matters in ship tail gas based on an alkaline adsorption technology. The method comprises the following steps: firstly, cooling the ship tail gas until water vapor is in a supersaturated state; spraying and mixing with an alkaline solution, and removing dust and particulate matters from the obtained gas phase; mixing the obtained liquid phase with an alkaline reagent, and filtering to obtain a solution in which the greenhouse gas is dissolved; the system comprises a heat exchanger, a decarbonization tower, dust removal equipment and a precipitation cabinet, the heat exchanger is connected with a ship tail gas exhaust pipe and used for cooling ship tail gas till steam is in a supersaturated state. The decarburization tower is used for spraying and mixing the cooled ship tail gas and an alkaline solution to obtain a gas phase and a liquid phase; the dust removal equipment is communicated with a gas phase outlet of the decarbonization tower and is used for removing particulate matters in a gas phase; and the precipitation cabinet is communicated with a liquid phase outlet of the decarbonization tower. Compared with the prior art, greenhouse gas and particulate matters, especially ultrafine particulate matters, in the tail gas of the marine diesel engine can be removed at the same time.

The present invention provides a system and method for heat and power cogeneration of a steam turbine waste heat in a solar thermal power station. The system mainly includes a steam turbine, a steam-water heat exchanger, and a compression heat pump. The steam turbine is connected to the steam side of the steam-water heat exchanger through a steam exhaust extraction pipeline, and the water side of the steam-water heat exchanger is connected to the compression heat pump through a circulating water pipeline. The compression heat pump is connected to a heating water pipeline. The latent heat of the steam exhaust from the steam turbine is transferred to the circulating water through the steam-water heat exchanger, and the circulating water with low-grade heat is converted into heating water with high-grade heat through the compression heat pump to provide heat to users, wherein the circulating water with the heat of the exhaust steam is stored in a circulating water storage tank, and the heating water with high-grade heat is stored in a heating water storage tank, and continuous heating is still achieved after the steam turbine is shut down. The present invention effectively improves the heat grade and comprehensive energy utilization rate, realizes peak cooling, solves the attenuation problem of the power station condensation system, and the problem of intermittent waste heat from the solar thermal power station, and is conducive to reducing heating costs and carbon emissions.

The embodiment of the invention provides a liquid spraying condensation system of an ammonia water circulation power generation system. The system comprises a liquid storage tank, a working medium pump, a spraying section, a condenser and a control valve. The low-concentration liquid ammonia water is sprayed into the high-concentration ammonia water vapor, so that the ammonia concentration is reduced, the condensation effect is ensured, the ammonia water vapor is prevented from entering the liquid storage tank, the back pressure of the system is reduced, and the efficiency of the system is improved. And the functions can be realized only by simply transforming the original Kalina cycle power generation system, and the system is simple in structure and easy to implement.

This utility model discloses a dust collection device for cutting building decoration materials, including a debris collection device and a high-pressure blower. The debris collection device includes a collection bucket and a second air inlet pipe. A debris baffle is provided inside the collection bucket. An air inlet hole is formed through one side of the top of the debris baffle. Air outlet holes are uniformly formed around the air inlet hole at the top of the debris baffle. Limiting notches are uniformly formed on the outer side of the debris baffle. A base plate is fixedly connected to the bottom end of the second air inlet pipe, and an exhaust pipe is uniformly fixedly connected to the top of the base plate. A top connecting plate is fixedly installed at the top of the second air inlet pipe. This utility model effectively solves the problem of difficult high-temperature handling of metal cutting debris through an innovative design of water-cooled dust suppression and multi-stage interception. It utilizes the fine bubbles generated by the exhaust pipe to extend the gas-liquid contact time, combined with the debris baffle forcing the debris to collide and sink multiple times, rapidly cooling the high-temperature debris.

The invention discloses an engine exhaust aftertreatment device and a vehicle, and relates to the technical field of vehicles. The particle trap is arranged in the exhaust channel and is provided with a carrier wall; in the axial direction of the particle trap, the carrier wall is provided with a first area section, a second area section and a third area section which are sequentially arranged, and the length of the second area section is larger than the sum of the length of the first area section and the length of the third area section. And the loading capacity of the catalyst coating of the second area section is greater than that of the catalyst coating of the first area section and greater than that of the catalyst coating of the third area section. By arranging the first area section, the second area section and the third area section with the axial gradient, the back pressure of the particulate filter can be reduced, oil consumption can be reduced, the output torque of an engine can be improved, and the engine exhaust aftertreatment device can have high filtering efficiency so as to meet the emission regulation requirement of the next generation.

The present invention provides a concrete pump pipe fixing structure for super high-rise building construction, which solves the problem that the pipe suspension phenomenon generated by the mobile platform used for the concrete pump pipe will increase the vibration amplitude of the outlet pipe of the concrete pump pipe, causing the pump pipe clamp to be easily loosened and the concrete pump pipe to fall off the mobile platform. The present invention includes a base plate and a roller mechanism arranged at the bottom of the base plate; a support structure extending in the up and down directions is rotatably arranged on the base plate, a clamping mechanism is arranged on the top of the support structure, and an annular channel for placing the concrete pump pipe is formed in the middle of the clamping mechanism; a locking mechanism is arranged in the annular direction at the front of the clamping mechanism, and a locking port for supporting the concrete pump pipe is arranged at the front end of the locking mechanism, and the locking port can be opened and closed and reset by itself, and the locking mechanism includes a plurality of spring rod mechanisms arranged at annular intervals; when the spring rod mechanism is in the initial state, the front end of the spring rod mechanism is inclined toward the axial direction of the annular channel.

The invention discloses a direct air cooling unit shading anti-freezing device, and relates to the technical field of direct air cooling systems of thermal power plants, the direct air cooling unit shading anti-freezing device comprises a main body unit, an air cooling island and a shading frame arranged above the air cooling island; and the shading anti-freezing unit comprises two driving assemblies arranged on the air cooling island, a supporting assembly arranged on the driving assemblies and connected with the shading frame, and a connecting assembly arranged on the shading frame. According to the direct air cooling unit shading and anti-freezing device, by arranging the shading and anti-freezing unit and utilizing a driving motor, a rotating shaft, a shading frame, a shading net and other structures on the shading and anti-freezing unit, solar radiant heat of an air cooling island is effectively shaded, the cooling effect of the air cooling island is improved, the unit back pressure is reduced, the unit load reception capacity is improved, and the unit auxiliary power consumption rate is reduced; and when the environment temperature is low, the height of the device is reduced, the density of the sunshade net is increased, the heat dissipation speed of the air cooling island is slowed down, and the effective anti-freezing effect is achieved.

The utility model discloses an SCR mixer and an engine aftertreatment device, and relates to the technical field of engine tail gas treatment. The urea and tail gas mixing device is used for mixing urea and tail gas to generate mixed gas and comprises a connecting shell and a barrel assembly connected into the connecting shell. The cylinder assembly comprises an air inlet cylinder and an air outlet cylinder which are distributed in the axial direction. The gas inlet cylinder is provided with a gas inlet for tail gas to enter, and the gas outlet cylinder is provided with a gas exhaust area for exhausting mixed gas; mixed gas only needs to enter the gas outlet cylinder through the axially-distributed gas inlet cylinder and is discharged through the gas outlet cylinder, and the mixed gas does not need to be discharged through an outer pipe, so that the back pressure of the gas is reduced, and the oil consumption is reduced; and moreover, a sleeved outer pipe is not arranged on the outer side of the cylinder body assembly, so that the manufacturing difficulty of centering is avoided, the structure is simplified, and the cost is reduced.

The invention provides a DPF system based on a particle collecting device and a control method thereof.The DPF system comprises the particle collecting device, the particle collecting device comprises an aggregation filter AF (103) and a cyclone particle collector CPC (100), the aggregation filter AF (103) arranged on the downstream of an exhaust pipe (101) filters particles in tail gas flowing through the exhaust pipe (101), and the cyclone particle collector CPC (100) filters the particles in the tail gas flowing through the exhaust pipe (101); the particulate matters remained in the aggregation filter AF (103) are aggregated into larger particles and then are discharged from the aggregation filter AF (103); and a cyclone particle collector (CPC) (100) is arranged at the downstream of the aggregation filter AF (103) and is used for capturing and treating particles discharged from the aggregation filter AF (103). The control method is used for controlling the DPF system.

The utility model relates to the technical field of nozzles for injection molding, in particular to an injection mold runner nozzle, which comprises a shell, a nozzle body and a nozzle cover, the spraying assembly is detachably arranged at the bottom end of the hollow flow channel; the valve pin is arranged at the hollow flow channel in a sliding manner; wherein a first accommodating groove and a second accommodating groove are formed in the bottom end of the hollow flow channel; the spraying assembly comprises a valve nozzle assembly arranged at the first containing groove, a third containing groove is formed in the top end of the valve nozzle assembly, and a penetrating spraying channel is formed in the lower side of the valve nozzle assembly. The fixing piece is detachably arranged in the second containing groove, is arranged in a hollow penetrating mode and is arranged on the outer side of the valve nozzle assembly in a sleeving mode; the supporting ring is clamped to the third containing groove, a first through hole is formed in the middle of the supporting ring, two or more second through holes are evenly formed in the peripheral side of the first through hole, and the second through holes communicate with the hollow flow channel and the avoiding part correspondingly. The utility model discloses a runner nozzle of an injection mold, and aims to solve the problem that a valve pin of an injection nozzle in the prior art is easy to deviate in the radial direction.

This invention discloses a waste heat recovery device for flue gas from a thermal oil aluminum melting furnace, relating to the field of baking furnace technology. The device includes a furnace, with a support rod fixedly connected to the outer wall of the furnace and an exhaust pipe fixedly connected to the top of the furnace. A furnace opening and closing door is provided on the front of the exhaust pipe, and a waste heat recovery mechanism is installed inside the exhaust pipe. By setting up the waste heat recovery mechanism, while heat is exchanged through inclined heat-conducting plates, the rotation of the inclined heat-conducting plates dynamically disturbs and redistributes the uneven heat distribution of the high-temperature flue gas within the exhaust pipe, continuously reconstructing the flue gas flow field. Through the continuous rotation of each inclined heat-conducting plate within the exhaust pipe, it is ensured that each inclined heat-conducting plate uniformly contacts and exchanges heat with the flue gas at all locations within the exhaust pipe, significantly improving the overall heat transfer efficiency and waste heat recovery rate.

The present invention discloses an exhaust system, control method, device and vehicle of an engine. In the exhaust system of the engine, the engine includes at least one cylinder and a supercharger, and the cylinder includes an exhaust valve; the exhaust system includes an exhaust valve, an exhaust duct, an exhaust manifold, an exhaust bypass pipe and an air guide valve; the exhaust duct is located between the exhaust valve and the air guide valve, one end of the exhaust duct is connected to the exhaust valve, and the other end is connected to the intake end of the air guide valve; the air guide valve is used to connect the first outlet end or the second outlet end by changing the action, the first outlet end is connected to the exhaust bypass pipe, and the second outlet end is connected to the exhaust manifold; the exhaust manifold is connected to the supercharger. Through the exhaust system and its control of the present invention, the action of the air guide valve is changed to control whether the supercharger participates in the exhaust, which can take into account the advantages of the turbocharged engine utilizing the exhaust energy and the low back pressure and low residual exhaust gas of the naturally aspirated engine.

The utility model discloses a steam balance optimizing device of a BDO device. The steam balance optimizing device comprises a first heat exchanger set, a second heat exchanger set, a steam generator, a fourth heat exchanger, a fifth heat exchanger and a sixth heat exchanger. The output end of the input end of the first group of heat exchangers is connected with the input end of a first condensed water collecting tank; the output end of the first condensed water collecting tank is connected with a 1.0 MPa steam pipe network and the input end of a first pressurizing water pump; the output end of the second heat exchanger is connected with the input end of the second condensed water collecting tank; the output end of the steam generator, the output end of the fourth heat exchanger and the output end of the fifth heat exchanger are connected with the input end of the third group of heat exchangers; according to the device, the energy consumption of the device is greatly reduced while various use points of the device are met; self-produced steam of an original high-pressure heat exchanger E-5610 and self-produced steam of a BDO separation tower top tank V-5755 are reserved, and a steam generator PK-6001 is additionally arranged. And the steam at the top of the original first condensed water flash tank is merged into a 1.0 MPa steam pipe network to fully recycle the steam after flash evaporation.

The utility model discloses a valve cover and contain its electromagnetic pulse valve, the valve cover includes valve cover body, the upper surface of valve cover body has the exhaust pipe outside, the exhaust pipe is used for discharging the air of valve cover chamber of electromagnetic pulse valve, the bottom of exhaust pipe with valve cover chamber is linked together, and the top of exhaust pipe constructs and has the exhaust outlet, to export the compressed air in valve cover chamber. Through separating exhaust pipe and valve cover body, the exhaust pipe is external on valve cover body, thus, the section area of exhaust passage increases, and the angle of exhaust passage is reduced, and the exhaust resistance is reduced, can effectively promote the output pressure rising rate of electromagnetic pulse valve.

The ultrasonic probe comprises a sound head, a connecting cable and a plug, the sound head comprises a sound head shell, a transducer and a heat exchange piece, the connecting cable comprises a connecting cable shell, a first liquid path pipe and a second liquid path pipe, and the plug comprises a plug shell and an active liquid cooling device. The active liquid cooling device comprises a radiator, a pump, a liquid storage tank, a third liquid path pipe and a fourth liquid path pipe. The outlet of the pump is connected with the liquid storage tank, the cavity in the pump is communicated with the cavity of the liquid storage tank through the fourth liquid path pipe, the liquid storage tank is provided with a relatively larger cavity, and the larger cavity has a wider horizontal cross section, so that the hydraulic pressure of liquid can be effectively reduced, and the hydraulic pressure of the cavity in the pump communicated with the liquid storage tank is also reduced; the back pressure of the pump can be reduced through the liquid storage tank, the working pressure of the driving film in the pump can be reduced through reduction of the back pressure in the pump, the service life of the driving film is prolonged, and then the service life of the pump is prolonged.

The utility model discloses a kind of anti-clogging boiler flue gas denitrification devices, it is related to flue gas denitrification device technical field, the anti-clogging boiler flue gas denitrification device, including denitration tower, the smoke inlet end of the denitration tower is connected with the smoke outlet end of boiler by smoke inlet pipe, denitration tower smoke outlet end is connected with the smoke pipe of elbow pipe shape, sweeping pipe is equipped in the outside of the bending section of smoke pipe, a plurality of sweeping head distributed along circumference is installed on sweeping pipe, each sweeping head is inserted into the inside of smoke pipe and is inclined to the wall of pipe and is arranged, for the directional sweeping of elbow pipe inner wall, ash outlet is set in the inside bottom of the bending section of smoke pipe, ash outlet is sealed and closed by detachable arc sealing plate, for discharging accumulated dust and reaction product.The utility model is by being provided with sweeping structure, ash outlet, zoning heating, helical flow guide vane and expansion smoke pipe, prevent from blocking, prevent from condensing, flow guide and steady flow are integrated in one, effectively promote the operation stability of boiler flue gas denitrification device.

The invention provides an operation control method for an anti-freezing device of a high-position water collecting cooling tower, which can be used for construction in a cold region. The anti-freezing device and a sealing ceiling are included, the anti-freezing device is arranged around the high-position water collecting cooling tower, and the sealing ceiling is arranged between the top of the anti-freezing device and a tower drum of the high-position water collecting cooling tower; the system further comprises a temperature measuring element in the water collecting tank and a system control module; through the system control module, the flexible wind screen can be automatically retracted into the driving device outer cover in the hot season, and air inlet of the high-position water collection cooling tower is not affected; in winter, operation control over the flexible wind screen can be manually or automatically executed according to an established control strategy under the winter operation working condition of the high-position water collecting cooling tower, the precise anti-freezing function of the high-position water collecting cooling tower is achieved, circulating water can operate at the low temperature, the back pressure of a unit is reduced, and the economical efficiency of the unit is improved; according to the automatic operation control method of the anti-freezing device, the stability and the safety of the circulating water control system with the high-level water collecting cooling tower are improved.

An AC coordinated control system includes a first coordinated controller and at least two welding power sources, the first coordinated controller including a parameter setting unit configured to set parameters required for welding, a communication unit in communication with each of the at least two welding power sources and configured to transmit the parameters to each of the at least two welding power sources, an output unit connected to the at least two welding power sources and configured to output a phase of the first coordinated controller to the at least two welding power sources, and a control unit connected to the parameter setting unit, the communication unit, and the output unit and configured to control actions of the parameter setting unit, the communication unit, and the output unit, wherein the at least two welding power sources are configured to output welding currents synchronized with the phase of the first coordinated controller in response to receiving the parameters transmitted by the output unit and the phase of the first coordinated controller. An operation method of an AC coordinated controller is also provided.

This invention relates to the field of gas field production technology, and in particular to a gas well pumping and drainage method for producing gas by draining liquid from the entire wellbore. The steps are as follows: Step 1: Deploy a single-flow device; Step 2: Begin the pumping operation; Step 3: The pumping device descends; Step 4: Reciprocating operation; Step 5: Detect the liquid accumulation and resume production. This invention provides a gas well pumping and drainage method for producing gas by draining liquid from the entire wellbore, and provides a downhole device with a reasonable structure, stable performance, and strong gas-liquid lifting capacity, which has a gas-liquid unidirectional flow control function to assist in gas-liquid lifting and prevent liquid backflow. This method solves the problems encountered in the pumping and drainage process of gas wells by adopting a new method of relay drainage using a pumping device and a single-flow device. It can significantly reduce the height of the liquid column in the wellbore, realize the lifting of liquid from the entire wellbore of the liquid-filled gas well, further improve the production recovery effect of the liquid-filled well, and effectively solve the problem of production recovery of liquid-filled gas wells.

The invention discloses an exhaust silencer with a self-adaptive adjusting valve. The exhaust silencer comprises a first exhaust pipe and an adjusting valve assembly. Channels extending from the air outlet end to the air inlet end of the first exhaust pipe in the extending direction of the first exhaust pipe are formed in the opposite positions of the pipe wall of the first exhaust pipe, and a plurality of through silencing holes are formed in the pipe wall of the first exhaust pipe in the circumferential direction and the extending direction of the first exhaust pipe; the adjusting valve assembly comprises a fixing base, two elastic pieces and a valve plate. The fixed seat is fixedly connected to the outer wall of the first exhaust pipe; the valve plate comprises a baffle plate and at least two connecting strips; the blocking piece is vertically arranged and slidably connected into the first exhaust pipe. The first ends of the two connecting strips are fixedly connected to the opposite positions of the edge of the blocking piece correspondingly, and the two connecting strips are slidably connected in the two channels correspondingly. The first ends of the two elastic pieces are connected with the second ends of the two connecting strips respectively, and the second ends of the two elastic pieces are connected with the fixing base. Corresponding to different application working conditions, the position of the valve plate can be adjusted in a self-adaptive mode, and the noise reduction performance is improved under the condition that smooth tail gas circulation is guaranteed.

The invention relates to an ablation catheter and an ablation system. The ablation catheter comprises a catheter body, a perfusion assembly and a needle assembly. The perfusion assembly is arranged in the catheter body and comprises a first perfusion tube and a first liquid inlet tube, the first perfusion tube is used for allowing the needle assembly to movably penetrate through and comprises a first tube section, a second tube section and a third tube section which are sequentially connected from the near end to the far end, and the radial size of the second tube section is the largest; the first liquid inlet pipe and the first pipe section are arranged side by side in the radial direction of the filling assembly and communicate with the second pipe section. The needle assembly comprises a second liquid inlet pipe, a second infusion pipe and an ablation needle which are sequentially connected from the near end to the far end, and the second liquid inlet pipe is separated from the first liquid inlet pipe. The ablation catheter is provided with the out-needle perfusion flow channel and the in-needle perfusion flow channel which can be independently controlled, the sealing performance of the perfusion assembly is good, and the perfusion assembly can tolerate the perfusion back pressure to 0.5 Mpa.

The utility model discloses a winter summer dual -purpose energy -conserving system for air cooling unit, including heat supply network system and air cooling system, heat supply network system includes steam turbine and heat supply network heat exchanger, and air cooling system is air cooling island, steam turbine includes steam turbine medium pressure cylinder and steam turbine low pressure cylinder, and steam turbine medium pressure cylinder communicates with heat exchange medium first inlet, and steam turbine low pressure cylinder respectively links up heat exchange medium second inlet, and air cooling island, and heat exchange medium first drain interface and heat exchange medium second drain interface are set up respectively on heat supply network heat exchanger, and heat exchange medium first drain interface and heat exchange medium second drain interface converge to hot well inlet, heat supply network circulating backwater water inlet and heat supply network circulating water supply water inlet are set up respectively on heat supply network heat exchanger. The utility model discloses in the high temperature period of summer, utilize the idle heat supply network heat exchanger as the peak cooler of air cooling unit, can effectively reduce the back pressure of air cooling unit, thereby improves unit efficiency.

This invention discloses a molten salt energy storage system and its operation method for thermal power plants coupled with compressed carbon dioxide energy storage, belonging to the field of energy storage and peak shaving in thermal power plants. The system includes a molten salt energy storage unit and a compressed carbon dioxide energy storage unit: molten salt is heated by extracted steam after reheating for heat storage; the heat of compression generated by the compressed carbon dioxide is used to heat feedwater and condensate, eliminating the need for an independent heat storage medium; before expansion, carbon dioxide is heated by four stages of extracted steam and high-temperature molten salt, and cold energy recovery is used to liquefy the carbon dioxide in a circulating manner; the operation method includes peak shaving and load reduction operation modes and peak shaving and load increase operation modes. This invention can improve the peak shaving response speed and regulation capability of thermal power plants, increase electricity-to-electricity efficiency by more than 20%, eliminate the need for cooling water and an independent heat storage medium, reduce investment, achieve energy cascade utilization and decoupled operation of compression and expansion, enable boilers to maintain high loads to achieve zero grid connection electricity, avoid frequent start-ups and shutdowns, and extend equipment life.

The utility model belongs to the technical field of granulator filter screen plates, and particularly relates to a high-efficiency filter screen plate for a granulator, which comprises a granulator body, a filter plate is mounted at a discharge port of the granulator body in an inserting manner, a plurality of round holes are formed in the filter plate, the diameter of each round hole is 6mm, a limiting groove is formed in the peripheral side of the filter plate, and the limiting groove is communicated with the discharge port of the granulator body. Sliding grooves are formed in the positions, located on the two sides of the filter plate, in the granulator body, clamping blocks are slidably installed in the sliding grooves, one sides of the clamping blocks extend into the limiting grooves, and first springs fixed to the inner walls of the sliding grooves are symmetrically and fixedly installed on the other sides of the clamping blocks; according to the filter plate, a worker can conveniently install the filter plate, tools are not needed during installation, the worker can conveniently operate the filter plate, plastic melts adhered to the inner walls of the round holes can be cleaned, it is guaranteed that no plastic melts remain on the inner walls of the round holes when the filter plate is used next time, meanwhile, back pressure can be reduced, and the service life of the filter plate is prolonged. And the passing ability of plastic melt is improved, and the production efficiency is improved.

The utility model provides a vacuum pump cooler for a vacuum pump system. The vacuum pump cooler comprises a heat exchanger, an industrial water supply pipeline, a closed water supply pipeline, a closed water return system, an industrial water recovery system, an industrial water source and a closed water source, one end of the heat exchanger is connected with the separator, one end of the heat exchanger is connected with the vacuum pump body, one end of the industrial water supply pipeline is connected with the industrial water source, the other end of the industrial water supply pipeline is connected with the other end of the heat exchanger, and the closed water supply pipeline is connected with the closed water source. The other end of the closed water supply pipeline is connected with the other end of the heat exchanger, and the closed water return system and the industrial water recovery system are both connected with the other end of the heat exchanger. The vacuum cooling pump solves the problem of poor cooling effect of the vacuum cooling pump in the prior art.

The utility model discloses a kind of turbine exhaust comprehensive utilization devices of maintaining controllable pressure difference, including steam turbine, condenser, air ejector, circulating water pump and condensate pump, the steam outlet of steam turbine is communicated with the steam side entrance of external negative pressure difference type waste heat recovery device by a steam extraction pipe fitting, and the water side import and export of negative pressure difference type waste heat recovery device is connected with heat user side system.This utility model relates to the technical field of energy saving of thermal system, the turbine exhaust comprehensive utilization device of maintaining controllable pressure difference, by setting additional exhaust steam waste heat utilization pipeline and the heat exchanger of waste heat utilization at the exhaust steam outlet of steam turbine, and by controlling heat exchanger outlet flow and pipeline inlet flow and the flow of main pipeline are corrected, to ensure that back pressure is not too high, steam turbine normal operation is not affected.

The present invention belongs to the technical field of automobile exhaust treatment, and discloses an exhaust treatment mixer and an engine. The exhaust treatment mixer comprises a guide pipe and a guide plate, the guide pipe comprises an intake port and an exhaust port, exhaust gas is input from the intake port and discharged from the exhaust port, a urea injection port is provided on the side wall of the guide pipe, urea is input into the interior of the guide pipe from the urea injection port; the guide plate is fixedly arranged on the inner wall of the guide pipe, the guide plate comprises a first panel, a second panel and a third panel which are sequentially connected and arranged along the direction of exhaust gas flow, the first panel and the second panel and the third panel and the second panel are arranged at an angle, and the urea injection port is located upstream of the third panel or upstream of the second panel or upstream of the first panel. The present invention reduces the resistance to the exhaust gas flow by simplifying the structure of the guide plate, and meets the use requirements of the engine.

The invention relates to a catalytic active material as well as a preparation method and application thereof, and belongs to the technical field of three-way catalysis. The catalytic active material comprises an active material body and a molecular sieve, the molecular sieve is provided with a plurality of pore channels, the active material body is packaged in the pore channels, and the active material body comprises a first precious metal and a second precious metal; wherein the first precious metal or the second precious metal is independently packaged in part of the pore channels; by packaging multiple metals on the molecular sieve, when the molecular sieve is used as a three-way catalyst, multiple precious metals on a single coating component are integrated, and back pressure rise is avoided. And at least part of the noble metal is independently encapsulated in the pore channels of the molecular sieve, and spatial isolation of the molecular sieve structure is utilized to avoid agglomeration of noble metal oxide nanoparticles due to movement at high temperature and catalyst deactivation caused by easy formation of PdRh, PtRh and other noble metal alloys due to Ostwaldski curing of the noble metal in a reducing atmosphere.