82 results about "Multistage compressor" patented technology

The invention provides an intelligent performance test method and system for a multistage series Roots vapor compressor. The method comprises the following steps: introducing vapor into equipment to be tested as a test medium; the to-be-tested equipment comprises a control unit, multiple stages of Roots vapor compressors connected in series, an interstage spraying device and a parameter detection unit; the opening degree of each valve in the pipeline valve assembly and the spraying water flow of the inter-stage spraying device are cooperatively controlled through the control unit, so that each stage of compressor in the to-be-tested equipment is stabilized at a preset test working condition point; after the to-be-tested equipment operates stably, acquiring steady-state operation data within a preset duration through a parameter detection unit; calculating a performance evaluation index of the to-be-tested equipment by using the steady-state operation data; the performance evaluation indexes comprise isentropic efficiency and / or volume efficiency of the compressor. The invention further provides a test system for implementing the method. According to the invention, through intelligent automatic control, the performance test of the multi-stage compressor is realized.

The invention discloses an isobaric multi-stage flexible compressed air energy storage system and an operation strategy thereof, relates to the technical field of compressed air energy storage, solves the problems that an air storage device is poor in universality and cannot fundamentally achieve efficient and flexible operation under variable working conditions, and comprises a multi-stage compressor unit, a multi-stage expansion unit and an air storage unit. The multi-stage compressor unit is composed of a first compressor unit, a second compressor unit and a third compressor unit, and the multi-stage expansion unit is composed of a first expansion unit, a second expansion unit and a third expansion unit. Through the isobaric gas storage technology, the non-design working condition caused by the pressure change of the storage tank is eliminated, the compressor and the turbine always work near the optimal pressure ratio, through the multi-machine parallel flexible combination, each device can operate at an efficient point close to the rated power of the device, the low-efficiency problem that a large horse pulls a small trolley in a single large device is avoided, and the working efficiency of the whole device is improved. And the overall efficiency of the system is greatly improved.

The invention belongs to the technical field of ground engineering natural gas gathering, transportation and treatment, and discloses a method for preventing and controlling generation of hydrates in a scattered natural gas recovery process, which comprises the following steps of: transforming a multi-stage compressor in a pressurizing, inflating and storing stage, adopting a frequency conversion fan as an air cooler at a last-stage outlet of the compressor, and adding a temperature controller; the temperature controller automatically and dynamically adjusts the rotating speed of the fan of the last-stage air cooler by comparing the simulated and pre-judged gas hydrate generation temperature with the simulated and pre-judged temperature after gas discharging of the transportation tank is completed, so that the temperature, monitored by the temperature sensor, of the outlet of the compressor is increased; and until the simulated and pre-judged temperature of the transportation tank after gas discharging is higher than the highest temperature of gas hydrate generation, full-process hydrate generation prevention and control are achieved through self-produced heat of the compressor. The multi-stage compressor in the pressurizing, inflating and storing stage is transformed, hydrate generation is prevented and controlled in the whole process through self-heat production of the compressor, and the scattered natural gas is safely and efficiently recycled at low cost.

The present invention relates to a boil-off gas reliquefaction system for a ship. The boil-off gas reliquefaction system for a ship according to the present invention, whereby boil-off gas generated from a liquefied natural gas (LNG) storage tank for a ship is reliquefied, comprises: a first heat exchanger for recovering cold heat from a first boil-off gas generated in the storage tank; a multi-stage compressor for compressing the boil-off gas that has passed through the heat exchanger; a high-pressure gas line for supplying high-pressure gas that is supplied from the multi-stage compressor; a low-pressure gas line for supplying the boil-off gas, which is supplied from the multi-stage compressor, as a low-pressure gas by using a decompression valve; a second heat exchanger in which heat exchange occurs between the high-pressure gas line and the low-pressure gas line downstream of the decompression valve; and a third heat exchanger by which the boil-off gas that has passed through the second heat exchanger is cooled by means of heat medium oil of a cryogenic chiller.

The application provides a compressed air energy storage power generation system based on cascade utilization of photothermal heat compensation and flash evaporation, and relates to the technical field of energy storage power generation. Air is compressed by a multistage compressor through an air compression heat exchange unit, high-pressure air is obtained, heat generated by compressed air is absorbed by low-temperature water, high-temperature water is obtained, an expansion power generation system is used, a multistage expander is used, high-temperature heat conducting oil obtained by the high-temperature water and a photothermal heat collection unit is used to heat input high-pressure gas of each stage of the expander in sequence, power generation is performed, electric energy, exhaust gas of the last stage of the expander, medium-temperature water and low-temperature heat conducting oil are obtained, high-grade energy utilization is realized, heat of the medium-temperature water is converted into electric energy by a flash evaporation power generation system, medium-grade energy utilization is realized, low-grade energy utilization is realized through preheating, the problem that the existing compressed air energy storage power generation system cannot realize cascade utilization of high, medium and low-grade energy is solved, and the application is suitable for energy storage power generation.

This invention is a method for the production and distribution of compressed air in organized industrial zones (OIZs), specifically involving the centralized production of compressed air using energy-efficient turbo compressors and its transmission to industrial facilities via high-pressure conveying lines. The method aims to produce compressed air more efficiently and minimize energy losses during transport, thanks to the low energy consumption and multi-stage compression mechanism of turbo compressors. This method also ensures fair and accurate billing based on the measurement of compressed air consumption supplied to industrial facilities. Each industrial facility is equipped with high-accuracy meters to precisely measure the amount of compressed air consumed. Data from these meters is collected and processed in real time via a central control system. Billing is then based solely on the amount of air consumed. The system aims to reduce operating costs through energy efficiency and low maintenance costs, as well as to ensure environmental sustainability by reducing carbon emissions. The fact that turbo compressors offer lower energy consumption and maintenance requirements compared to screw compressors increases the overall efficiency of this method and provides economic advantages.

The application discloses a pipeline structure for multistage compressor series connection, which comprises a first pipe body and a second pipe body connected with each other, a first cavity, a second cavity and a third cavity are sequentially arranged in the first pipe body along the length direction, the cross-sectional dimension of the second cavity is smaller than that of the third cavity; a fourth cavity and a fifth cavity are sequentially arranged in the second pipe body along the length direction, the cross-sectional dimension of the fourth cavity is smaller than that of the third cavity; a valve body is slidably arranged in the third cavity, the length of the valve body is smaller than the depth of the third cavity, and a flow channel communicating with the third cavity and the fourth cavity is arranged in the valve body. The application can automatically increase the pressure of the gas when the pressure of the gas is small, and can automatically make part of the gas directly jump over the pressure increasing stage when the pressure of the gas is large, which is beneficial to optimizing the load distribution and effectively improving the pressure increasing efficiency and the cycle transfer efficiency of the multistage compressor.

The application discloses a system identification method for mechanical damping of a compressor blade, and the method is as follows: a working condition is determined through steady CFD calculation of a multistage compressor, and is used as an initial field to carry out unsteady CFD calculation; blade modal force amplitude f and phase θ are calculated based on the results of the aerodynamic unsteady calculation and strength finite element analysis; aerodynamic damping under different pitch diameters is calculated by combining the influence coefficient method, and average aerodynamic damping coefficients of aerodynamic damping under all different pitch diameters are calculated; vibration response values of the blade under typical states in the test are measured, and are converted into blade generalized displacement q; the modal force amplitude f, the phase θ, the blade generalized displacement q and the average aerodynamic damping coefficients are brought into a formula to obtain mechanical damping of the blade. Advantageous effects: the real mechanical damping of the blade in a multistage environment is obtained, and based on the obtained mechanical damping, the prediction accuracy and reliability of forced response of the blade in subsequent blade type optimization and blade modification design of derivative types can be effectively improved.

This application relates to the field of large-scale energy storage and integrated energy utilization technology, and in particular to a pre-cooled and heated megawatt-class compressed air energy combined cooling, heating and power system. The system includes: a multi-stage compressor, a multi-stage cooler, a multi-stage heater, a multi-stage expander, a preheater, a hot water tank, a cold water tank, an air storage tank, a high-temperature tank, a chiller, a heater and a low-temperature tank, a high-efficiency heat exchanger, a precooler, a condenser, and control components. It can realize the conversion from electrical energy to compressed air potential energy and then to thermal energy, and vice versa. It can fully utilize the system's own energy and automatically adjust the inlet temperature of the multi-stage compressor according to environmental conditions, enhancing the stability of the system and materials with seasonal changes. Therefore, it solves the problems of high total compression work consumption, large energy loss, poor system thermal storage performance, and low system efficiency in megawatt-class compressed air energy combined cooling, heating and power systems.

The application discloses a flue gas carbon dioxide capturing and conveying integrated system, and relates to the technical field of carbon dioxide capturing.The carbon dioxide capturing and conveying integrated system comprises a pretreatment and absorption module, an integrated processing module, a refining and liquefaction module and an energy management and control module, the pretreatment and absorption module is used for preliminarily treating flue gas and absorbing CO2 in the flue gas, the integrated processing module comprises a multistage compressor unit, a desorption tower and a closed heat pump circulation system, the closed heat pump circulation system is used for transmitting heat generated by the multistage compressor unit to the desorption tower, the refining and liquefaction module is used for refining CO2 gas desorbed and obtaining liquid CO2 used for conveying through liquefaction, and the energy management and control module is used for dynamic regulation and control of each module.The capturing and conveying integrated system can realize integrated, efficient and compact processing from flue gas to conveyable liquid CO2 product through process depth coupling and modular design.

To provide a compressor unit which includes a plurality of stages of compressors and is suitable for compressing hydrogen gas generated by a water electrolysis system.SOLUTION: The compressor unit 10 is used to compress the hydrogen gas generated by the water electrolysis system 25. The compressor unit 10 includes a screw compressor 12 that hydrogen gas containing moisture generated from the water electrolysis system 25, a dryer 14 that is disposed on the downstream side of the screw compressor 12 and dries the hydrogen gas, and a reciprocating compressor 16 that further compresses the hydrogen flowing out from the dryer 14.SELECTED DRAWING: Figure 1

The application discloses a compressed air energy storage-fused salt heat storage comprehensive energy system and an operation method thereof, and belongs to the technical field of energy conversion and energy storage. The system comprises a multi-stage compressor unit, a fused salt-air heat exchanger group, a high-temperature fused salt tank, a low-temperature fused salt tank, a high-pressure gas storage well, an expander, a generator, a regional heat supply heat exchange unit, a heat network circulating pump, a water supplement device and an inter-stage reheating flow channel. The multi-stage compressor unit is connected with the high-pressure gas storage well through the fused salt-air heat exchanger group, and the low-temperature fused salt tank and the high-temperature fused salt tank form a heat storage loop through the fused salt-air heat exchanger group. The outlet of the high-temperature fused salt tank is divided into two paths, one of which is connected with the expander through the inter-stage reheating flow channel, and the other of which is connected with the regional heat supply heat exchange unit to form a closed heating loop. The expander is coaxially connected with the generator, and the air inlet of the expander is connected with the high-pressure gas storage well. The application realizes large-temperature-difference external heat supply while improving the power generation efficiency through high-temperature fused salt heat storage and double-path heat distribution.

This invention proposes a photovoltaic-driven compressed air energy storage system with multi-stage compression and segmented heat recovery. The system includes: photovoltaic modules, a multi-stage compressor unit, a thermal storage heat exchanger, a high-temperature thermal storage tank, a low-temperature thermal storage tank, a regenerative heat exchanger, an expander, and an ORC unit. The photovoltaic modules supply power to the multi-stage compressor unit, which compresses the gas and stores it in the gas storage tank. Part of the heat generated is stored in the high-temperature contact tank and the low-temperature thermal storage tank through two thermal storage heat exchangers. The gas storage tank then feeds the high-pressure gas into the expander for expansion and work, driving a generator to produce electricity. Part of the waste heat from the expander's exhaust gas is fed into the ORC unit for secondary power generation, realizing waste heat utilization. This invention achieves efficient utilization and long-term energy storage of photovoltaic energy, significantly improving energy efficiency and operational safety, and solving the problems of low efficiency, large heat loss, and insufficient regulation capacity in traditional compressed air energy storage systems.

To provide a system and method for exhaust gas recirculation and injection in a gas turbine.SOLUTION: The system includes a gas turbine system having a gas turbine engine including a compressor, a combustor, and a turbine. The gas turbine system further includes an exhaust gas recirculation (EGR) system configured to recirculate a first portion of an exhaust flow from the gas turbine engine to an air intake of the gas turbine engine. The system further includes an exhaust gas injection system including a multistage compressor including a plurality of stages, wherein the multistage compressor is configured to compress a second portion of the exhaust stream. The exhaust gas injection system further includes an intercooler coupled to the multistage compressor. The exhaust gas injection system is configured to inject a second portion of the exhaust stream into the gas turbine engine at one or more exhaust injection locations other than the air intake to provide power augmentation of the gas turbine engine.SELECTED DRAWING: Figure 1

The invention provides a compressor waste heat utilization system and method, and belongs to the technical field of oil field waste heat recycling, the system comprises a natural gas loop and a produced liquid loop, the natural gas loop comprises a compressor, the compressor comprises multiple stages of compression mechanisms arranged in a stacked mode, and the compressor pressurizes natural gas step by step through the multiple stages of compression mechanisms; the natural gas loop and the produced liquid loop share a plurality of heat exchangers, the heat exchangers in the natural gas loop correspond to the compression mechanisms, the heat exchangers are arranged at the rear ends of the compression mechanisms of the same stage, and natural gas and produced liquid conduct heat interaction through the heat exchangers. The method comprises the steps that the heat exchange process is subjected to analog calculation, step-by-step pressurization is conducted through the compressor, and multi-stage heat exchange is conducted through the heat exchanger. According to the system and the method, interstage compression waste heat utilization can be carried out on the compression mechanism, interstage heat and produced liquid are subjected to heat exchange, produced liquid heating is achieved, the waste heat utilization efficiency is improved, and meanwhile the energy consumption of a natural gas treatment system and the energy consumption of an oil and gas gathering and transportation treatment system are further reduced.

The invention relates to a compressed air energy storage compression side power tracking control method, which comprises the following steps of: constructing a multi-stage compressor basic dynamic model, and obtaining a mixed power expression by combining thermodynamic deviation, an inter-stage coupling effect and an unstable area power abrupt change correction data set; establishing an explicit efficiency expression between the real-time operation efficiency and the operation condition of each stage of compressor; power tracking deviation is determined based on a hybrid power expression, so that a multivariate objective function is constructed, a multi-objective model prediction control system is constructed according to an explicit efficiency expression in combination with a preset safety constraint condition, and weight coefficients in the number of the multi-objective model prediction control system are adjusted according to requirements of different operation scenes; and a self-adaptive control instruction is obtained. Therefore, the problems that in the prior art, when strong disturbance such as power grid frequency sudden change and wind-solar power sudden change is coped with, the instability phenomena such as surge and blockage of a compressor unit are easily induced, and in a serious situation, mechanical damage to equipment and energy storage interruption are caused are solved, and the multi-scene self-adaptive control effect is improved.

A compressor system includes an electric motor having a rotatable output shaft extending from either end thereof. The compressor system further includes multiple compression stages fluidly coupled to one another in series and mechanically connected to the output shaft. The first compressor stage includes two split impellers with each impeller discharging approximately one half of the fluid flow at a desired pressure to the second compressor stage.

This invention discloses a controllable pressure ratio hydraulically driven booster system and control method, comprising: two or more booster units, each booster unit connected in series according to its stage number; the driving device for each booster unit is an independent variable flow hydraulic pump station; each booster unit's inlet and outlet pipes are equipped with pressure gauges and temperature detectors; and a control system that receives data from the pressure gauges and temperature detectors and controls the flow rate of the corresponding independent variable flow hydraulic pump station. This invention enables real-time adjustment of the pressure ratio of a multi-stage compressor, ensuring that the compressor always approaches a constant pressure ratio, significantly reducing compressor energy consumption.

This application discloses a system and method for producing cryogenic cooling capacity based on carbon dioxide, belonging to the field of pipeline transportation technology. The system includes: a multi-stage compressor, a first heat exchanger, an absorption chiller, a regenerator, a second heat exchanger, a booster pump, and an expander. By processing the input room-temperature gaseous carbon dioxide through a series of steps, the system can output cryogenic gaseous carbon dioxide that provides cryogenic cooling capacity for the cryogenic distillation process of carbon dioxide. By using this cryogenic carbon dioxide to replace liquid ammonia as a refrigerant, not only is the problem of the difficulty in obtaining cryogenic cooling capacity in the cryogenic distillation process solved, but the hazards are also reduced, making the refrigeration process more energy-efficient and environmentally friendly.

The invention belongs to the technical field of energy storage and utilization, relates to a compressed air energy storage and air separation coupling system, and aims to solve the problems of inflexible operation modes and the like. The device comprises a compressed air energy storage unit and an air separation unit. The compressed air energy storage unit comprises a multi-stage compressor energy storage unit, a multi-stage heat exchanger heat storage / release unit, a high-pressure gas storage unit and a first multi-stage expansion machine energy release unit; and the air separation unit comprises a second multi-stage expansion machine energy release unit and an air separation tower. High-pressure air in the high-pressure gas storage unit can be supplied to the first multi-stage expansion machine energy release unit in a branching mode for energy release power generation, or is supplied to the second multi-stage expansion machine energy release unit after being purified and heated, and cold energy is provided for the air separation tower while expansion acting power generation is conducted. According to the invention, independent expansion machine paths are set to respectively serve energy storage electricity release and air separation air supply, so that the dual functions of electricity generation and air supply are realized, and the peak power supply capacity, flexibility and energy utilization efficiency are improved.

A multi-cylinder fluid compressor for compressing a working fluid. The compressor includes a first gas compression cylinder, divided into axially aligned compression chambers by a first reciprocating gas piston, and a second gas compression cylinder, divided into axially aligned compression chambers by a second reciprocating gas piston. The gas compression cylinders are axially aligned and the reciprocating gas pistons are driven by a common piston rod extending through the compression cylinders and operably connected with the reciprocating gas pistons. The common piston rod is reciprocally driven by a hydraulic fluid supply system to reciprocally drive the reciprocating gas pistons. The compressor system may be operated as a multi-stage compressor system by conveying working fluid outlet from one compression chamber to the inlet of another compression chamber. Cooling may be provided between stages. One application for the compressor is in a vapor recovery system for drawing low pressure vapors that can accumulate above hydrocarbon liquids in a tank.

A refrigeration device and a control method, control device and storage medium thereof. The refrigeration device comprises: a refrigeration system comprising a multi-stage compressor, a condenser, a throttling device and an evaporator connected in sequence, the multi-stage compressor comprising a plurality of compression modules connected in sequence, at least one compression module comprising a compression unit and a cooler, the cooler being located on the downstream side of the compression unit and being in communication with the compression unit, and each compression module comprising a compression unit; and a cooling system comprising a cooling flow path, an input end of the cooling flow path being connected to the evaporator and / or the condenser, and an output end of the cooling flow path being connected to the cooler, and being configured to deliver a cooling medium in the evaporator and / or the condenser to the cooler to reduce the superheat of the refrigerant discharged by the cooler. The present scheme can utilize the cooling medium in the system to cool the multi-stage compressor, without the need for an external cooling circulating water system, thereby facilitating the miniaturization of the refrigeration device and reducing costs.

A multi-cylinder fluid compressor for compressing a working fluid. The compressor includes a first gas compression cylinder, divided into axially aligned compression chambers by a first reciprocating gas piston, and a second gas compression cylinder, divided into axially aligned compression chambers by a second reciprocating gas piston. The gas compression cylinders are axially aligned and the reciprocating gas pistons are driven by a common piston rod extending through the compression cylinders and operably connected with the reciprocating gas pistons. The common piston rod is reciprocally driven by a hydraulic fluid supply system to reciprocally drive the reciprocating gas pistons. The compressor system may be operated as a multi-stage compressor system by conveying working fluid outlet from one compression chamber to the inlet of another compression chamber. Cooling may be provided between stages. One application for the compressor is in a vapor recovery system for drawing low pressure vapors that can accumulate above hydrocarbon liquids in a tank.

Turbomachine (210) for a vehicle (200a), in particular a commercial vehicle (200b), comprising at least one fuel cell system (205) with at least one fuel cell stack (206), wherein the turbomachine (210) comprises a multi-stage compressor (215) having at least two rotatably mounted compressor impellers (216a, 216b) for supplying the fuel cell stack (206) with an air supply flow (110) on the cathode side; the turbomachine (210) comprises a recirculation blower (220) having at least one rotatably mounted recirculation impeller (221) for conveying a fluid (120) used on the anode side by the fuel cell stack (206); wherein the compressor impellers (216a, 216b) and the recirculation impeller (221) are mechanically and rotationally fixedly connected to each other for carrying out a common rotational movement (R).

The invention discloses an energy-saving rectification method for heavy alcohol recovery of a DMC (Dimethyl Carbonate) device, which comprises the following steps: rectifying waste liquid of the DMC device through a light component removal tower, distilling light component water and methanol from the tower top of the light component removal tower, and feeding tower kettle material flow of the light component removal tower into an ethylene glycol recovery tower; an MEG product is distilled from the tower top of the ethylene glycol recovery tower, and a tower kettle material flow of the ethylene glycol recovery tower is further separated through a heavy alcohol separation tower; the tower top steam of the heavy alcohol separation tower is heated through a multi-stage compressor unit, exchanges heat with the tower kettle material flow through a heavy alcohol separation tower heat exchanger, and then passes through a heavy alcohol separation tower condenser to distill a DEG product; and after tower kettle liquid of the heavy alcohol separation tower exchanges heat with tower top steam, distilling out a TEG product through an auxiliary condenser of the heavy alcohol separation tower.

The present disclosure provides a multi-stage compressor and an air conditioning unit. The multi-stage compressor includes a flash tank, which is arranged in the multi-stage compressor, a refrigerant inlet of the flash tank is configured to be communicated with a condenser, a vapor outlet of the flash tank is communicated with a high-pressure-stage suction port of the multi-stage compressor, and a liquid outlet of the flash tank is configured to be communicated with an evaporator. The multi-stage compressor and the air conditioning unit of the present disclosure effectively improve compressor efficiency.