1156 results about "Centrifugal compressor" patented technology

The embodiment of the invention provides a centrifugal compressor performance data determination method and a centrifugal compressor performance optimization method, and belongs to the technical field of centrifugal compressors. The method comprises the steps that the inlet guide vane opening degree and the compressor rotating speed are combined to obtain an operation mode combination; grouping the original compressor operation parameters based on the operation mode combination to obtain grouped operation parameters, wherein the grouped operation parameters comprise evaporator parameters, condenser parameters, refrigerating capacity of a refrigerating machine and unit operation efficiency parameters; calculating a flow coefficient and a pressure ratio of a compressor according to evaporator parameters, condenser parameters and refrigerating capacity of a refrigerator; the isentropic compression efficiency of the compressor is calculated according to the condenser parameters; calculating the isentropic compression efficiency of the compressor unit based on the unit operation efficiency parameter and the isentropic compression efficiency of the compressor; and constructing a performance curve based on the compressor flow coefficient, the pressure ratio, the compressor isentropic compression efficiency and the compressor unit isentropic compression efficiency. According to the embodiment of the invention, the performance data of the centrifugal compressor can be accurately obtained, and the accuracy of performance optimization is improved.

According to the centrifugal compressor, a motor cavity is defined by a shell, and a plurality of pressing wheels are arranged at the two ends of a rotor shaft respectively; in the height direction of the centrifugal compressor, the first medium inlet is located in the lower end of the shell, the second medium inlet is located in the upper end of the shell, the medium outlet is located between the first medium inlet and the second medium inlet, and the first medium inlet, the second medium inlet and the medium outlet all communicate with the motor cavity. Therefore, the multiple pressing wheels are arranged at the two ends of the rotor shaft correspondingly, staged compression of gas can be achieved, the centrifugal compressor can achieve the higher pressure ratio, and the operation efficiency of the centrifugal compressor is improved; according to the centrifugal compressor, the first medium inlet is located in the lower end of the shell, the second medium inlet is located in the upper end of the shell, and the medium outlet is located between the first medium inlet and the second medium inlet, so that the flowing-in and flowing-out positions and the flowing speed of media are reasonable, the cooling effect of the centrifugal compressor can be remarkably improved, and the working performance of the centrifugal compressor is improved.

The invention relates to the technical field of compressor state monitoring, and particularly provides a multi-parameter identification method for rotating stall of a centrifugal compressor. The method comprises the following steps: acquiring pressure pulsation data according to a pressure sensor of the centrifugal compressor; according to a sparse dictionary corresponding to the centrifugal compressor, sparse reconstruction is conducted on the pressure pulsation data, a stall sensing signal is obtained, and the sparse dictionary is obtained through training according to the pressure pulsation data collected by a pressure sensor of the centrifugal compressor; according to the stall sensing signal, identifying a phase parameter of stall dynamic propagation through a two-channel fusion and space phase identification method; and calculating a plurality of target parameters of the centrifugal compressor according to the phase parameters. The problems that a centrifugal compressor parameter identification method in the prior art is low in accuracy and low in efficiency are solved.

A centrifugal compressor includes a rotary shaft, an electric motor, an impeller, a thrust bearing, and a housing having a passage that includes a motor cooling passage and a bearing cooling passage. The housing includes an inner housing and an outer housing. The motor cooling passage is defined by the inner housing and the outer housing. The passage includes a branching passage through which cooling fluid is divided and flows into the motor cooling passage and the bearing cooling passage and a joining passage through which the cooling fluid flowing through the bearing cooling passage joins the cooling fluid flowing through the motor cooling passage. The motor cooling passage includes a guide wall that guides the cooling fluid flowing through the motor cooling passage.

The invention discloses an energy-saving type magnetic suspension centrifugal water chilling unit, and relates to the technical field of refrigeration, the energy-saving type magnetic suspension centrifugal water chilling unit comprises a magnetic suspension compressor, a variable-diameter throttling mechanism and a heat exchange system, the heat exchange system is fixedly installed on the side face of the outer wall of the magnetic suspension compressor, and the variable-diameter throttling mechanism is fixedly installed on the side face of the outer wall of the heat exchange system; an outlet of the magnetic suspension compressor is directly connected with the heat exchange system through a pipeline, and the reducing throttling mechanism is connected with the heat exchange system through a pipeline. The front-stage closed impeller and the rear-stage semi-open impeller are coaxially connected in series, efficient compression without mechanical contact and oil lubrication is achieved, the problems that a centrifugal compressor is high in energy consumption and large in vibration due to mechanical friction are solved, and the energy efficiency ratio of a unit is effectively increased.

The invention discloses a new-configuration cross-medium aircraft based on blade tip jet rotors and a working method thereof, the aircraft has an air flight mode, an underwater navigation mode and a cross-medium mode, and comprises a fuselage; the main rotor system comprises an electric centrifugal compressor which is arranged on the fuselage in a jacking manner and a blade tip air injection main rotor blade which is connected with an air path of the electric centrifugal compressor; the auxiliary lift system comprises lift units arranged on the fuselage in a distributed mode, and the lift units can be independently controlled; in the air flight mode, the propeller tip jets air, the main rotor rotates, and the auxiliary lift system works to realize air flight; and in the underwater navigation mode, the blade tip jets air, the main rotor stops rotating, the blades on the single side are overturned around the fixed axis till the blade nozzles face the advancing rear portion, and the underwater water jet propulsion device is formed. The novel-configuration cross-medium aircraft disclosed by the invention adopts a distributed lift force layout, has relatively large take-off weight and good maneuverability, can realize continuous medium crossing, and is small in water entering and exiting impact.

The invention relates to the technical field of multi-stage centrifugal compressors, and discloses a multi-shaft multi-stage centrifugal compressor for a high-temperature heat pump, which comprises an input shaft, an output shaft and a gear box, the input shaft and the output shaft are arranged on the gear box, the input shaft is in transmission connection with the output shaft through a gear set, one end of the output shaft is provided with a first-stage compressor, and the other end of the output shaft is provided with a second-stage compressor. A first-stage compressor is installed at one end of the output shaft, a second-stage compressor is installed at the other end of the output shaft, a first-stage sealing device is arranged at the joint of the first-stage compressor and the gear box, a second-stage sealing device is arranged at the joint of the second-stage compressor and the gear box, and the first-stage sealing device is communicated with the second-stage sealing device. The secondary sealing device is communicated with an air exhaust compressor through an air exhaust pipeline, the air exhaust compressor is installed on the input shaft, and the air exhaust compressor conveys a working medium to a working medium system. The sealing device is arranged between the compressor and the gearbox, so that leakage of working media is reduced, and the sealing effect is improved.

The utility model discloses a heat management system based on an air floatation centrifugal compressor and a machine room. The heat management system comprises the air floatation centrifugal compressor, an evaporator, a condenser and a throttling element. An air inlet of the air flotation centrifugal compressor communicates with an outlet of the evaporator, a liquid cooling module is arranged in the air flotation centrifugal compressor to cool a motor of the air flotation centrifugal compressor, an inlet of the liquid cooling module is connected to an outlet of the condenser through a first control valve, and an outlet of the liquid cooling module is connected to an inlet of the evaporator. The evaporator is arranged at the to-be-cooled device to absorb heat emitted by the to-be-cooled device. An inlet of the condenser communicates with an exhaust port of the air flotation centrifugal compressor, and the throttling element is arranged at an inlet of the evaporator and used for conducting throttling expansion on the cooled refrigerant. The heat management system is applied to the machine room, an oil separator and corresponding pipelines are omitted, the overall structure is simple, and meanwhile the heat dissipation efficiency can be improved.

The centrifugal compressor provided by the application comprises an impeller, a diffuser and a backflow device. The diffuser comprises a cover plate and a partition plate. The cover plate is installed on the backflow device and forms a containing cavity with the backflow device. The partition plate is accommodated in the containing cavity and divides the containing cavity into a supply air passage communicated with an air inlet. The supply air passage comprises a diffuser passage, a reversing passage and a backflow passage. The reversing passage has opposite first and second side walls. The first side wall is arranged on the inner side wall of the cover plate, and the second side wall is arranged on the outer side wall of the partition plate. The first side wall comprises a first arc surface, a second arc surface and a first plane arranged between the first arc surface and the second arc surface. The second side wall comprises a third arc surface and a fourth arc surface. According to the scheme, the gas in the diffuser passage is smoothly transitioned into the backflow passage, and the loss of gas flow from the diffuser passage into the backflow passage is avoided.

The invention discloses a centrifugal compressor assembly error modeling method integrating manufacturing error and assembly deformation, which comprises the following specific steps: S1, measuring an assembly surface by adopting line laser and a three-coordinate measuring machine, assembling surface point clouds of all assembling parts of the centrifugal impeller of the centrifugal compressor are obtained through feature extraction, a surface model of the assembling parts in interference fit with the centrifugal impeller is reconstructed based on an NURBS curved surface modeling method, and deformation calculation of interference fit of the centrifugal impeller is conducted; s2, calculating a matching error of the assembly surface of each assembly part by adopting a point cloud constraint registration method; and S3, based on the assembly constraint relation between the matching surfaces and the improved Jacobian-spinor model, a centrifugal compressor centrifugal impeller assembly chain error transfer model is established. The method has the advantages that the problem that error sources are not comprehensively considered in the actual assembly process is solved, the constraint relation between assembly surface matching errors is considered, and the assembly chain error transmission model is constructed and used for improving the assembly error prediction precision.

The invention discloses a multistage closed-loop recovery method and system for industrial flue gas waste heat, and particularly relates to the technical field of waste heat recovery. The method comprises the following steps: predicting a process steam demand through a high-temperature section temperature parameter in flue gas monitoring data, and predicting a preheating medium demand based on a low-temperature section temperature parameter in the flue gas monitoring data; inputting the high-temperature-section demand prediction result and the low-temperature-section demand prediction result into a dynamic heat balance equation, calculating an optimized set point of a three-stage compressor unit, and adjusting the rotating speeds of a centrifugal compressor, a screw compressor and a scroll compressor by adopting a fuzzy PID (Proportion Integration Differentiation) algorithm; collecting temperature and flow data of secondary waste heat after the industrial equipment is reused, and generating secondary waste heat monitoring data; according to a compressor adjusting instruction and secondary waste heat monitoring data, the real-time opening degrees of the two-way stop valve and the electric adjusting valve are controlled, backflow of secondary waste heat to the interstage heat exchanger set is achieved, closed-loop recycling of industrial flue gas waste heat is completed through countercurrent flow heat exchange, and the waste heat recycling efficiency and the system stability are improved.

The invention discloses a gas compression assembly for a centrifugal compressor and the centrifugal compressor, and relates to the technical field of compressors, the gas compression assembly comprises a motor, a first-stage pressing wheel, a second-stage pressing wheel and a third-stage pressing wheel, the motor is provided with a rotor shaft, the rotor shaft forms a weight reduction space, the first-stage pressing wheel is fixedly arranged at the first end of the rotor shaft, and the second-stage pressing wheel is fixedly arranged at the second end of the rotor shaft; the first-stage pressing wheel nose is located on the side, away from the motor, of the first-stage pressing wheel back, the second-stage pressing wheel is fixedly arranged at the second end of the rotor shaft, the second-stage pressing wheel back is located on the side, away from the motor, of the second-stage pressing wheel nose, and the third-stage pressing wheel is fixedly arranged at the second end of the rotor shaft and located on the side, away from the motor, of the second-stage pressing wheel. The third-stage pressing wheel nose is located on the side, away from the motor, of the third-stage pressing wheel back. According to the gas compression assembly, staged compression of gas can be achieved, the centrifugal compressor can achieve a higher pressure ratio, gas loss can be reduced, the working efficiency of the gas compression assembly is improved, and the weight of the gas compression assembly can be reduced.

According to the equipment and the method, hydrogen is pre-cooled with a mechanical low-temperature pre-cooling cycle and a helium cycle through a first-stage heat exchanger, is subjected to ortho-secondary conversion through a second heat exchanger, a fourth heat exchanger and a fifth heat exchanger, and is subjected to heat exchange with cold helium discharged from a first turbo expander in the helium cycle; and liquid hydrogen generated after the liquid hydrogen enters the liquid hydrogen throttling valve to be throttled enters the liquid storage tank, and the hydrogen liquefaction process is completed. Helium entering and exiting the helium circulation low-temperature compressor unit is subjected to mechanical low-temperature precooling, the compression work is reduced through helium low-temperature compression, the expansion work is recycled through the turbo expander, and the thermodynamic efficiency of the system is improved; the hydrogen liquefying system only depends on the cooling capacity provided by the helium circulating system and the mechanical low-temperature pre-cooling circulating system, hydrogen liquefying can be completed without compression, and the system safety is improved; the helium circulation low-temperature compressor unit and the mechanical low-temperature compressor both adopt oil-free gas suspension centrifugal compressors, so that the problems of oil removal and oil return are avoided, and the reliability is remarkably improved.

Aircraft turbomachine including a centrifugal compressor, a combustion chamber, the combustion chamber being supplied by the compressor via a diffuser and via a straightener, and a heat exchanger, the exchanger including a first circuit, supplied with exhaust gas from the turbomachine, and a second circuit, which are connected by volutes on the one hand to an outlet of the diffuser and on the other hand to an inlet of the straightener, the volutes having reversed winding directions such that their connection ports to the exchanger are independent of one another and are substantially diametrically opposed, and such that the minimum cross section of each duct is situated at a larger cross section of the other duct.

The invention discloses a gas compression assembly for a centrifugal compressor and the centrifugal compressor, and relates to the technical field of compressors, the gas compression assembly comprises a motor, a first-stage pressing wheel, a second-stage pressing wheel and a third-stage pressing wheel, the motor is provided with a rotor shaft, the first-stage pressing wheel is fixedly arranged at the first end of the rotor shaft, and the second-stage pressing wheel is fixedly arranged at the second end of the rotor shaft; the first-stage pressing wheel nose is located on the side, away from the motor, of the first-stage pressing wheel back, the second-stage pressing wheel is fixedly arranged at the second end of the rotor shaft, the second-stage pressing wheel back is located on the side, away from the motor, of the second-stage pressing wheel nose, and the third-stage pressing wheel is fixedly arranged at the second end of the rotor shaft and located on the side, away from the motor, of the second-stage pressing wheel. The third-stage pressing wheel nose is located on the side, away from the motor, of the third-stage pressing wheel back. According to the gas compression assembly, self-balance of the axial force of the gas compression assembly can be achieved, the stability of the gas compression assembly during working can be improved, the reliability of the centrifugal compressor can be improved, gas leakage can be reduced, and the working efficiency of the gas compression assembly can be improved.

The invention relates to a centrifugal compressor PIV speed measurement and analysis method, device and equipment and a medium. The method comprises the following steps: acquiring flow field optical measurement data of the centrifugal compressor through a particle image velocity measurement technology; inputting optical measurement data of the flow field into a deep learning model, and extracting dynamic characteristics of the flow field through a characteristic extraction layer of the deep learning model; reconstructing the dynamic characteristics of the flow field into a three-dimensional flow field velocity vector field by using a velocity vector reconstruction layer in the deep learning model; and generating a velocity measurement analysis result based on the three-dimensional flow field velocity vector field. By adopting the method, the multi-scale dynamic characteristics in the complex three-dimensional rotating flow field of the centrifugal compressor can be effectively captured, high-precision three-dimensional velocity vector reconstruction is realized, and the spatial resolution and robustness of flow field measurement are improved.

The utility model relates to the technical field of variable-frequency centrifugal water chilling units, and discloses an anti-incrustation variable-frequency centrifugal water chilling unit which comprises a supporting frame, an evaporator, a centrifugal compressor and a condenser, and a second water inlet is formed in the position, close to the top end, of the front end of the condenser. The bottom ends of the first water inlet and the second water inlet are each provided with a slag discharging opening. The second water inlet is formed in the end face of the condenser and used for water inflow, the annular plate and the mounting plate are connected and mounted through the bolts, the filter screen is used for filtering treatment, then the transmission shaft can be driven to rotate after the driving motor works, and at the moment, the cleaning rod rotates correspondingly, and meanwhile the cleaning effect is improved. The cleaning brush can clean residues on the surface of the filter screen, at the moment, the residue discharging opening can be used for residue discharging treatment, and therefore in the working process, the overall inflow water filtering work is well improved, the proportion of impurities in water flow is reduced, and scale formation is reduced.

The present invention relates to the technical field of multi-stage centrifugal compressors, and discloses a multi-shaft multi-stage centrifugal compressor for a high-temperature heat pump, comprising an input shaft, an output shaft and a gearbox, wherein the input shaft and the output shaft are mounted on the gearbox, the input shaft is connected to the output shaft through a gear set, a primary compressor is mounted on one end of the output shaft, a secondary compressor is mounted on the other end of the output shaft, and an exhaust compressor is also included, a primary sealing device is provided at the connection between the primary compressor and the gearbox, a secondary sealing device is provided at the connection between the secondary compressor and the gearbox, the primary sealing device is communicated with the secondary sealing device, the secondary sealing device is communicated with the exhaust compressor through an exhaust pipeline, the exhaust compressor is mounted on the input shaft, and the exhaust compressor delivers a working medium to a working medium system. The present invention reduces the leakage of the working medium and improves the sealing effect by arranging a sealing device between the compressor and the gearbox.

A discharge system for bulk tank trailers unloads dry bulk material from a bulk product trailer that is configured to be pulled by a vehicle. The discharge system includes a centrifugal compressor, a drive mechanism and a speed increaser. The centrifugal compressor is configured to deliver compressed air to force the dry bulk material from the bulk product trailer and convey the dry bulk material to a storage tank. The drive mechanism furnished rotational motion to the centrifugal compressor (e.g., via a power take-off of the vehicle). The speed increaser is disposed between the centrifugal compressor and the drive mechanism and is configured to increase the speed of the rotational motion furnished by the drive mechanism to the speed compressor. The drive mechanism may include a hydraulic system configured to drive a liquid product pump for pumping liquid product from a liquid product storage tank trailer pulled by the vehicle.

To provide a centrifugal compressor which can reduce a processing cost while suppressing reduction in efficiency due to power loss while reducing a flow rate of a surge point flow.SOLUTION: In a centrifugal compressor of the present disclosure, a casing includes an inflow passage in which a fluid flows, a discharge passage, and an impeller storing part which stores an impeller and has a facing face forming an outer passage extending in one axial direction from an upstream end of the discharge passage along with a cover. The inflow passage includes a limit point at a position where a center angle of an arc of a chip-side flat face from a reference point toward a downstream side is 30°. The casing includes a circulation passage which communicates a region between a plurality of blades and the inflow passage, and communicates with an end part on one axial direction side of the outer passage. An inlet-side opening on the impeller side of the circulation passage is positioned at a boundary between an upstream end face of the cover and the casing. An outlet-side opening on the inflow passage side of the circulation passage is positioned on an upstream side from the limit point.SELECTED DRAWING: Figure 2

The invention relates to an air suspension high-speed centrifugal compressor applied to the technical field of centrifugal machines, and the air suspension high-speed centrifugal compressor comprises a machine body, a centrifugal rotor, a pneumatic bearing, a magnetic suspension system, an end magnetic disk, a shaft magnet, a brake magnet, a magnetic core, an arc rail groove, a brake module and a steering rib. Vector electromagnetic phase modulation is adopted by the electromagnet, active damping control and gyroscopic effect compensation of the centrifugal rotor are achieved through magnetic field vector synthesis, the centrifugal rotor is accelerated and decelerated through magnetic force, the critical rotation speed acceleration time and deceleration time of the centrifugal rotor are effectively shortened, and the hybrid magnetic locking technology is adopted in the shutdown stage of the centrifugal machine. When the centrifugal rotor is static, the brake module is triggered, magnetic pole reversal of the brake magnet is achieved through a reconstruction mechanism generated by the brake magnet, and the centrifugal rotor is in a stable magnetic attraction brake state through the cooperative magnetic attraction effect of the permanent magnet and the brake magnet.

The invention discloses a method for calculating the strength of an end face tooth coupling of an energy storage centrifugal compressor, relates to a method for calculating the strength of an end face tooth coupling, and aims to solve the problem that a method for accurately judging whether the strength of the end face tooth coupling of the compressor is qualified or not by a conventional end face tooth calculation and checking method does not exist at present. The method is implemented according to the following steps that firstly, axial component force generated when the end face teeth transmit torque is obtained; 2, the axial expansion difference of the end face teeth, the main shaft and the screw at the working temperature is calculated, and the actual pre-tightening force of the screw during unit operation is calculated; 3, impeller thrust generated by the front and back pressure difference of the impeller is calculated, the effective tooth surface area of the end face teeth is calculated, and the end face tooth root bending stress, the end face tooth maximum extrusion stress and the end face tooth axial tensioning force safety coefficient of the centrifugal compressor are calculated; and 4, judging the strength of the end face tooth coupling of the energy storage centrifugal compressor. The invention belongs to the field of end face tooth coupling checking.

The invention provides a design method of an asymmetric guide vane diffuser for a centrifugal compressor, and belongs to the technical field of distributed new energy and aviation power. The method comprises the steps that the basic size and shape of the diffuser are determined based on the outlet airflow condition of the centrifugal compressor; according to the connecting mode of the diffuser and the volute, the design requirement of the asymmetric guide vane is determined; according to the number of the blades, the numbers and initial positions of the blades are determined, and according to airflow conditions and blade outlet boundary requirements, the angles and the positions of the blades are adjusted; based on the preliminary design, geometric parameters of the blade are calculated, and the geometric parameters comprise the trailing edge distance, the included angle and the mean camber line coordinate; and gradually optimizing the geometric parameters through an iterative calculation method. Through iterative optimization and CFD simulation, the aerodynamic performance of the diffuser can be remarkably improved, the flow loss is reduced, and the overall efficiency of a gas compressor is improved.

The utility model discloses a centrifugal nitrogen compressor, and particularly relates to the technical field of centrifugal compressors, the centrifugal nitrogen compressor comprises a base, an outer shell and an impeller, a supporting table is fixed at the top end of the base, the outer shell is fixed at the top end of the supporting table, an inner shell is fixed in the outer shell, the impeller is arranged in the inner shell, and the impeller is arranged in the inner shell. A rotating shaft is installed in the impeller, and a heat dissipation assembly is installed on one side of the shell. The air box, the first air groove and the second air groove are arranged, the second air groove is located on the outer side of the outer shell, air is blown to the outer surface of the outer shell through the second air groove along with rotation of the fan blades in the air box and is matched with the cooling fins, cooling treatment can be conducted from the outer side, and meanwhile the first air groove penetrates through the outer shell and the inner shell and penetrates out of the other side of the outer shell. And part of air penetrates out of the first air groove and can assist in heat dissipation treatment from the interior, and the internal and external synchronous heat dissipation performance of the centrifugal nitrogen compressor is achieved.

The invention discloses a double-unit double-stage centrifugal compressor and an operation control method, and belongs to the technical field of centrifugal compressors. Comprising an evaporator, a low-pressure-stage compressor, a high-pressure-stage compressor, a power saver and a condenser. S2, collecting the cold water outlet temperature and the cooling water outlet temperature after the water pump operates; s3, estimating the running pressure ratio 1t of the unit; according to the design pressure ratio of the low-pressure-stage compressor, the low-pressure-stage compressor is started, the high-pressure-stage compressor is not started, and on the contrary, the high-pressure-stage compressor is started to operate after operation starting feedback of the low-pressure-stage compressor is completed; and S4, in the operation process, if the operation pressure ratio is larger than or equal to the design pressure ratio of the low-pressure-stage compressor, the high-pressure-stage compressor is switched into operation. The mode that the low-pressure-stage compressor and the high-pressure-stage compressor are connected in series is adopted, and by controlling the low-pressure-stage compressor and the high-pressure-stage compressor, stable and efficient working condition operation of the centrifugal compressor is achieved.

A centrifugal compressor is described comprising an anti-surge return line is disclosed, wherein a radial expansion impeller is arranged downstream a compressor discharge and one or more flow regulators are arranged between the compressor discharge and the radial expansion impeller, and wherein the radial expansion impeller discharge is connected with the anti-surge return line. A method for controlling surge in a compressor is also described, the method comprising a step of directing at least a portion or volume of the continuous flow of fluid from the compressor to a radial expansion impeller and to a return line.

The invention relates to the technical field of organic solid waste treatment, in particular to a process system for hydrogen production and co-production of biological natural gas from biological crude synthesis gas, which comprises a purification unit, a hydrocarbon regulation unit, an acid removal unit, a methane upgrading unit, a hydrogen recycling and purifying unit and a methane recycling and purifying unit which are connected in sequence. The purification unit is used for removing impurities through pre-impurity removal, compression, dry-process impurity removal and wet-process desulfurization to produce purified synthesis gas and sulfur; the hydrocarbon adjusting unit is pressurized through a centrifugal compressor and adjusts the hydrogen-carbon ratio; the acid removal unit is used for removing acid gas and organic sulfur; the methane upgrading unit is used for converting CO / CO2 into methane through methanation reaction; and the recycling unit purifies hydrogen through pressure swing adsorption and recycles methane by using a membrane separation technology to produce biogas. The problems of low purity and insufficient raw material utilization rate of the traditional process are solved through the circulation process, the co-production of high-purity hydrogen and biogas is realized, and the additional value of resources is improved.

The present application relates to the technical field of compressors, and discloses a centrifugal compressor and a refrigeration device. The centrifugal compressor comprises: a housing, which is provided with a gas inlet and a gas outlet; a centrifugal compression mechanism, which is located in the housing and used for pressurizing a fluid flowing in from the gas inlet and then flowing out of the housing from the gas outlet; a main shaft, which extends in the vertical direction and is arranged in the housing, wherein the main shaft can rotate around the axis thereof; a bearing assembly, which is arranged on the outer side of the main shaft in a sleeving manner; and a centrifugal pump, which is arranged on the outer side of the main shaft in a sleeving manner and can rotate along with the main shaft. The housing defines lubricating channels and an oil cavity, the lubricating channels are communicated with the oil cavity and the bearing assembly, the centrifugal pump is communicated with the oil cavity, and the centrifugal pump can drive oil to circularly flow between the oil cavity and the bearing assembly through the lubricating channels. The coaxial centrifugal pump arranged on the vertical main shaft is used as an oil pump, omitting an oil pump driven by a motor, reducing the power consumption of the oil pump, and improving the efficiency of the compressor.

The invention relates to the field of centrifugal compressors, in particular to a high-pressure centrifugal compressor which comprises a high-pressure centrifugal compressor body, an air inlet pipe and an exhaust pipe are arranged on the high-pressure centrifugal compressor body, the exhaust pipe is connected with an external pipeline through a connecting mechanism, and a detection mechanism is arranged between the exhaust pipe and the external pipeline in a covering mode. Through the synergistic effect of a tensioning assembly (meshing transmission of a gear ring and a gear) of the connecting mechanism and a spring energy storage structure, rapid fastening sealing of the exhaust pipe and an external pipeline can be achieved only by rotating an operation ring, compared with traditional flange connection, bolts do not need to be operated one by one, the assembling efficiency is remarkably improved, meanwhile, a first spring provides continuous axial pressing force, and the assembling efficiency is improved. A connecting gap caused by vibration or temperature change can be dynamically compensated, it is ensured that the sealing ring is in a tight fit state all the time, and the air leakage risk is effectively avoided.

The invention relates to a pneumatic performance testing system for a centrifugal refrigeration compressor, which belongs to the technical field of refrigeration compressor testing and comprises a refrigeration pipeline communicated between an outlet of a second-stage centrifugal compressor and an inlet of a first-stage centrifugal compressor. A first adjusting valve CV1, a first gas cooler and a first electric heater are sequentially arranged on the refrigeration pipeline in the advancing direction of refrigerants, a second gas cooler is arranged on the middle pipeline, and a fourth adjusting valve CV4, a fifth gas cooler and a second electric heater are sequentially arranged on the air supplementing pipeline. According to the invention, the pressure and temperature of the refrigerant entering the first-stage centrifugal compressor can be adjusted, and the pressure and temperature of the refrigerant entering the second-stage centrifugal compressor can be adjusted, so that the refrigerant gas reaches the suction pressure and temperature required by the tested two-stage centrifugal refrigeration compressor; therefore, the performance of the two-stage centrifugal refrigeration compressor can be tested respectively, and the test effect of the high-speed centrifugal refrigeration compressor is improved.