30results about How to "Address pressure fluctuations" patented technology

The invention discloses a device and a method for testing a gas diffusion coefficient in a porous medium. The device mainly comprises a clamp holder, gas sampling systems, a confining pressure pump, a pressure balancing system, a gas supply system, a gas chromatograph analyzer and a vacuum pump; the two ends of the clamp holder are connected to the inlet ends of the gas sampling systems; the outlet ends of the gas sampling systems are connected with the gas chromatograph analyzer and the vacuum pump; the two ends of the clamp holder are connected with the gas supply system respectively, and are also connected with the confining pressure pump and the pressure balancing system; the clamp holder comprises a housing, a sample bridge, a sample cavity and a plug; a confining pressure cavity is arranged in the housing; the sample bridge is positioned in the center of the clamp holder; a porous medium sample is stored in the sample cavity. Through the adoption of the method, influence on a test result, which is caused by the seepage flow of gases in the porous medium in a testing process and pressure fluctuation during gas sampling, is eliminated, and interference of residual gases in a sampling pipeline to the test result is effectively reduced. The device and the method are reliable in principle and simple and convenient to operate, improves the accuracy of the diffusion coefficient to be tested, and has a broad market prospect.

The invention discloses a mixing device of high-pressure natural gas and low-pressure gas, comprising: a low-pressure gas transmission pipeline, a high-pressure natural gas pipeline and a decompression assembly. The low-pressure gas transmission pipeline is connected to the pressurizer and transmits the low-pressure gas, and the pressurizer pressurizes the low-pressure gas and transmits it to the heating furnace. High-pressure natural gas pipelines transport high-pressure natural gas. One end of the decompression assembly is connected to the high-pressure natural gas pipeline, and the other end is connected to the output end of the compressor. Inlet shut-off valve, multi-stage pressure regulator, safety relief valve, pressure regulating relief valve, flow regulating valve and outlet shut-off valve. The invention also discloses a mixing method of high-pressure natural gas and low-pressure gas. The invention can decompress the high-pressure natural gas and then mix it into the low-pressure coal gas, and solves the problem of pressure fluctuation when the high-pressure natural gas is mixed into the low-pressure coal gas.

The invention discloses a method and a device for denitrification and heat recovery of industrial furnace flue gas. The method comprises that the high-temperature flue gas is converted into low-temperature flue gas after heat exchange and reaction in the flue gas channel formed by the U-shaped regenerator containing the catalyst, and the ambient air is heat-transformed in the air channel formed by the U-shaped regenerator containing the catalyst. High-temperature air, flue gas channel and air channel are switched through the reversing valve; the device mainly includes the heating furnace and its air distribution control system, U-shaped regenerator, reversing valve, air inlet and outlet modules, and flue gas inlet and outlet Module and reversing valve driving device; air inlet and outlet modules, reversing valve and flue gas inlet and outlet modules are located on the diameter of the reversing valve, and U-shaped regenerators are evenly distributed on both sides of the diameter of the reversing valve. The invention integrates denitrification and regenerative heat recovery functions, and can replace waste heat boilers and denitrification towers as a whole; it does not need to introduce reducing agents from the outside, which greatly reduces device investment, land occupation and operating costs.

The invention provides a fan gas inlet device which comprises a gas inlet pipeline and a gas inlet cap. The gas inlet cap comprises a cap body and two cap side portions extending from the two sides ofthe cap body correspondingly. The cap body is provided with a front edge lip and a rear edge part. A gas inlet is formed between the front edge lip and the gas inlet pipeline. The rear edge part is connected to the gas inlet pipeline. The cap side portions are connected to the gas inlet pipeline and are provided with gas inlet holes. According to the fan gas inlet device, through the manner of changing the condition of a flow field in the fan gas inlet by arranging the gas inlet cap, the pressure fluctuation condition is pressed within an acceptable range, and therefore the problem of pressure fluctuation is solved.

The invention discloses a slurry shield machine with a slurry circulation system. The slurry shield machine with the slurry circulation system comprises an excavation bin, a cutter, an air cushion bin, a gate, a slurry feeding assembly, a slurry discharging assembly, a pressurizer and a stone breaking device, wherein the gate is arranged between the excavation bin and the air cushion bin; the slurry feeding assembly comprises a first slurry feeding tube and a second slurry feeding tube; a slurry outlet of the first slurry feeding tube communicates with the excavation bin; a slurry outlet of the second slurry feeding tube communicates with the air cushion bin; the slurry discharging assembly comprises a first slurry discharging tube and a second slurry discharging tube; a slurry inlet of the first slurry discharging tube communicates with the excavation bin; a slurry inlet of the second slurry discharging tube communicates with the air cushion bin; the pressurizer comprises a ventilation opening which communicates with the air cushion bin; and the stone breaking device is arranged on an upstream side of the slurry inlet of the second slurry discharging tube. According to the slurry shield machine with the slurry circulation system, a first working mode and a second working mode of the slurry shield machine can be switched over when the slurry shield machine runs, and adaptation and tunneling ability of the slurry shielding machine are improved.

The invention discloses a roller press hydraulic system and an automatic pressure stabilizing device thereof, and belongs to the roller press hydraulic system and a matched device. The automatic pressure stabilizing device comprises a hydraulic oil station (1), a left pressure stabilizing device (2) and a right pressure stabilizing device (3), wherein energy storage devices (4) and combined valve bodies are arranged in both the left pressure stabilizing device (2) and the right pressure stabilizing device (3); the energy storage devices (4) in the left pressure stabilizing device (2) and the right pressure stabilizing device (3) are communicated with oil cylinder working chambers (5) on the two sides of the roller press hydraulic system through pipelines respectively; and the combined valve bodies in the left pressure stabilizing device (2) and the right pressure stabilizing device (3) are arranged closely to oil cylinders on the two sides of a roller press respectively. The automatic pressure stabilizing device of the roller press hydraulic system provided by the invention has a simple overall structure, the problem of pressure fluctuation of the conventional hydraulic system of the roller press is solved well, an extrusion effect of a material is enhanced, and the yield of a roller press system is improved.

The invention discloses a stable high-pressure medical pump. The stable high-pressure medical pump comprises a pump body, a liquid inlet pipe and a liquid outlet pipe; a first piston cylinder and a second piston cylinder are arranged in the pump body; a first liquid inlet channel and a first liquid discharge channel communicates with an inner cavity of the first piston cylinder; a second liquid inlet channel and a second liquid discharge channel communicates with an inner cavity of the second piston cylinder; the liquid inlet pipe is respectively connected with the first liquid inlet channel and the second liquid inlet channel, and is provided with one-way valves on the first liquid inlet channel and the second liquid inlet channel; a switching valve is arranged on the pump body; the liquid outlet pipe can communicate with the first liquid discharge channel or the second liquid discharge channel through the switching valve; and pistons and piston rods are respectively mounted in the first piston cylinder and the second piston cylinder. The stable high-pressure medical pump comprises two piston cylinders, uses an asynchronous continuous pressing mode of double pistons to realize reciprocating motions of the double pistons, matches with the one-way valves and the switching valve to realize no-gap continuous high pressure, overcomes the fluctuation problem of a water jet scalpel, and keeps excellent cutting performance of the water jet scalpel under constant pressure.

The invention discloses a vacuum pressure swing adsorption system operating under constant pressure and a control process thereof, comprising an adsorption tower, a fan and a vacuum pump. The adsorption towers are divided into three groups, and each group is composed of two adsorption towers. The operation modes of primary pressure drop, secondary pressure drop, vacuum analysis, secondary pressure rise, primary pressure rise, and feeding are cycled. The present invention is a six-column process. Through the optimal control of its own process, secondary pressure equalization is adopted in the adsorption and vacuum analysis process. Compared with the existing 2 to 5 tower process, the fluctuation range is reduced because the number of pressure equalization is one more time. It solves the pressure fluctuation problem of the system itself, and can be used to solve the pressure fluctuation problem of the fan outlet and the pressure fluctuation problem of the vacuum pump, so that the system can run smoothly.

The invention provides a transfer synchronizing mechanism of a high-temperature and high-pressure formation fluid analysis meter. The transfer synchronizing mechanism comprises two high-precision motors (1-1 and 1-2), two high-precision right-angle speed reducers (2-1 and 2-2) connected with the two high-precision motors (1-1 and 1-2) respectively, a host A (3) connected with the high-precision right-angle speed reducer (2-1), a host B (4) connected with the high-precision right-angle speed reducer (2-2), a metal high-pressure line (5) used for connecting the host A (3) and the host B (4), a synchronizing controller (7) connected with the high-precision motor (1-1) and the high-precision motor (1-2), and synchronous control cables (6) used for being connected with the two high-precision motors (1-1 and 1-2) and the synchronizing controller (7) respectively. The high-precision servo motors and the high-precision right-angle speed reducers are adopted, so that the feeding quantity of the host A and the supplementary quantity of the host B are controlled to be consistent, and pressure is also stabilized.

Embodiments of the present invention provide a compensation method, device, excavator and processor for hysteresis of proportional valve of an excavator. The excavator includes a main pump, a controller and a proportional valve. The method includes: acquiring a target action of the main pump; The target action is to generate a corresponding PWM signal; superimpose the dither signal on the PWM signal; and output the PWM signal after superimposing the dither signal to the proportional valve to reduce the hysteresis of the proportional valve. By optimizing the controller program, the hysteresis of the proportional valve is compensated and improved without changing the electro-hydraulic control system and the original PWM output frequency. At the same time, because the PWM output signal is constantly changing and responding, the control accuracy of the proportional valve is greatly improved, and the error when the controller adjusts the proportional valve for reciprocating motion is reduced, which significantly improves the accuracy and stability of the hydraulic system.

A rotary pressure filter device, a seal for use with the rotary pressure filter device and a method of using the same. This rotary pressure filter unit is designed to process solid-liquid mixtures under pressure in multiple successive work zones. Rotating the drum moves the compartment containing the solid-liquid mixture through the plurality of successive zones. These zones are separated by sealing means designed to reduce pressure surges when the compartments enter the continuum.