CN114352566A - Air inlet system of centrifugal compressor - Google Patents
Air inlet system of centrifugal compressor Download PDFInfo
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- CN114352566A CN114352566A CN202210012789.7A CN202210012789A CN114352566A CN 114352566 A CN114352566 A CN 114352566A CN 202210012789 A CN202210012789 A CN 202210012789A CN 114352566 A CN114352566 A CN 114352566A
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Abstract
The invention relates to an air inlet system of a centrifugal compressor, which comprises two paths of air inlet pipelines, wherein one path of air inlet pipeline is an inlet air inlet pipeline of the original centrifugal compressor, and the other path of air inlet pipeline is an auxiliary external air source air inlet pipeline; supplementary external air supply intake pipe is gone up and is established ties each part of installation in proper order according to the direction of admitting air and includes: the pneumatic stop valve, the pneumatic throttling film regulating valve and the gas distributor are arranged on the side of the gas inlet pipeline in front of the inlet guide vane of the centrifugal compressor; and the adjustment of the pneumatic stop valve and the pneumatic throttling film adjusting valve is integrated into a full-automatic control system of the air inlet system of the centrifugal compressor. The implementation of the invention can effectively improve the inlet air pressure of the centrifugal compressor in the refrigeration field, ensure that the inlet air pressure, the outlet pressure and the flow are in the design value range, maintain the safe, stable and economic operation of the centrifugal compressor, and obviously reduce the surge shutdown failure rate of the centrifugal compressor caused by insufficient pressure.
Description
Technical Field
The invention belongs to the field of centrifugal compressors, and particularly relates to a centrifugal compressor air inlet process system applied to the refrigeration industry.
Background
Centrifugal compressors are also known as turbine compressors: the compressor is mainly used for compressing gas and mainly comprises a rotor and a stator: the rotor comprises an impeller and a shaft, and the impeller is provided with blades, a balance disc and a part of shaft seal; the main body of the stator is a cylinder, and the stator also comprises a diffuser, a bend, a reflux device, an air inlet pipe, an exhaust pipe and other devices. The main components of a centrifugal compressor used to compress gas are an impeller rotating at high speed and a diffuser with gradually increasing flow area. The centrifugal compressor works on gas through an impeller, and mechanical energy is converted into pressure energy of the gas by utilizing centrifugal boosting action and speed reduction and diffusion action in a flow passage of the impeller and a diffuser. In chemical industry, petroleum refining, metallurgy, refrigeration and other industries, a centrifugal compressor is a very critical device.
The working mechanism of the centrifugal compressor is as follows: when gas flows through the impeller of the centrifugal compressor, the impeller which runs at high speed enables the gas to be under the action of centrifugal force, on one hand, the pressure is improved, and on the other hand, the speed is greatly increased, namely, the centrifugal compressor firstly converts the mechanical energy of a prime motor into the static pressure energy and the kinetic energy of the gas through the impeller. Then, when the gas flows through the passage of the diffuser, the section of the flow passage is gradually increased, the flow velocity of the front gas molecules is reduced, and the rear gas molecules continuously flow forwards, so that most kinetic energy of the gas is converted into static pressure energy, namely, the function of boosting is further achieved. Obviously, the work of the impeller on the gas is the root cause of the increased pressure of the gas, and how much the impeller works per unit mass of gas per unit time is closely related to the peripheral speed of the outer edge of the impeller, the greater the peripheral speed, the greater the work of the impeller on the gas.
The refrigeration industry widely uses various centrifugal compressors such as air, oxygen and nitrogen with the exhaust pressure of less than 5 MPa.
According to the working mechanism of the centrifugal compressor, all the centrifugal compressors of various types are designed with compressor characteristic curves for controlling and adjusting the working condition variable quantities of the centrifugal compressor, such as inlet air pressure, flow rate and compression ratio, outlet pressure and flow rate, efficiency, power and the like. The design working condition of the centrifugal compressor is set according to the actual operation characteristic curve of theoretical design and field surge test correction, and the adjustable range of the design values of the air inlet pressure and the flow is limited.
When the air inlet pressure and the air inlet flow are in the designed value range, the centrifugal compressor operates in the designed working condition area, the inlet air radially enters the impeller, the flowing condition of the air in the impeller flow channel accords with the design calculation, and the compression efficiency and the mechanical efficiency of the compressor are in the optimal working point. When the air inlet pressure and the air inlet flow are reduced and are larger than the lowest alarm value and smaller than the design value, but still run in the design working condition area, the compression ratio of the centrifugal compressor is increased, the outlet pressure and the air inlet flow are reduced, the compression efficiency and the mechanical efficiency of the compressor are reduced, and the compressor deviates from the optimal working point. When the inlet pressure and the flow are reduced to be smaller than the lowest alarm value and larger than the interlocking value and the centrifugal compressor runs in a deviation mode from the design working condition area, the inlet direction deviates from the radial inlet angle, gas rotates and breaks away from blades of the impeller, and the blades cannot improve the gas pressure, so that the outlet pressure and the flow of the centrifugal compressor are reduced and cannot reach the design values. When the inlet air inlet pressure and the inlet air inlet flow are reduced to be smaller than the interlocking value, the centrifugal compressor is in an unstable operation state, the gas flowing working condition in an impeller flow passage is deteriorated, and finally the centrifugal compressor generates surge failure or is automatically stopped in an interlocking mode.
At present, centrifugal compressors applied to the refrigeration industry all adopt a single inlet air inlet design process, the process has a very limited adjusting range on air inlet pressure and flow, and a centrifugal circulation nitrogen compressor in an oxygen-nitrogen liquefaction device is taken as an example: the product nitrogen is pressurized by a pressurizing turboexpander, heat is exchanged by a heat exchanger, after being liquefied by a liquefier, one part of the product nitrogen is output as product liquid nitrogen, and the liquefied nitrogen is not recycled and liquefied; in the process, a centrifugal type circulating nitrogen press often generates surge phenomenon due to insufficient inlet pressure, and in order to maintain inlet air inlet pressure, the conventional process usually adopts two adjusting modes, namely, a backflow valve is arranged to prevent the nitrogen press from surging, the backflow valve is opened to enable medium-pressure nitrogen at the outlet part of the circulating nitrogen press to flow back to the inlet end of the inlet of the circulating nitrogen press, the inlet pressure of the inlet of the circulating nitrogen press is kept stable, but the outlet flow of the circulating nitrogen press is reduced, the nitrogen is repeatedly compressed, and the reactive power consumption is increased; and secondly, under the condition that the centrifugal circulation nitrogen compressor is provided with the emptying valve, in order to prevent surging, the opening degree of inlet guide vanes of the nitrogen compressor is reduced, and the inlet pressure of the inlet of the circulation nitrogen compressor is maintained within a rated range as much as possible, but the inlet air inflow is reduced too much, so that surging fault of the nitrogen compressor is caused.
In the prior art, the adjustment of inlet pressure and flow of a centrifugal compressor is very limited no matter a mode of setting a reflux valve or a mode of adjusting the opening of an inlet guide vane is adopted; the centrifugal compressor has the advantages that the air inlet pressure and the air inlet flow are mainly determined by the single inlet air inlet mode of the centrifugal compressor, the air inlet pressure and the air inlet flow are mainly determined by the pressure and the air flow of the outlet gas of an upper process pipeline, the operation stability of the upper process production line has great influence on the operation working condition of the centrifugal compressor, and the adjustment range of the air inlet pressure and the air inlet flow in front of the inlet of the centrifugal compressor body is very limited, so that the centrifugal compressor is easy to operate unstably, the operation working condition is easy to fluctuate due to the influence of the upper process production line, when the upper process production line operates unstably, the air inlet pressure is often deviated from the designed working condition range of the compressor, and the failure rate and the operation energy consumption of the centrifugal compressor are high.
Disclosure of Invention
The invention provides a technical scheme of an air inlet system of a centrifugal compressor, aiming at improving the inlet air inlet pressure of the centrifugal compressor in the refrigeration field, ensuring that the inlet air pressure, the outlet pressure and the flow are in the design value region and maintaining the safe, stable and economic operation of the centrifugal compressor.
The invention relates to a technical scheme of a centrifugal compressor air inlet system, which comprises two air inlet pipelines: one path is a main air inlet source pipeline, namely an original centrifugal compressor inlet air inlet pipeline, the other path is a low-pressure air source pipeline which introduces the same gas medium from the outside of an original air inlet system and is an auxiliary external air source air inlet pipeline, and two paths of air inlets are simultaneously used during working.
The characteristic curves and various parameters of the centrifugal compressor under different working conditions are collected on site and compared and analyzed, a low-pressure air source with the same medium is introduced from the outside as an auxiliary external air source aiming at the phenomenon of insufficient inlet air pressure of the inlet of the centrifugal compressor, and an air inlet pipeline of the auxiliary external air source is connected to a front main air inlet pipeline of an inlet guide vane of the centrifugal compressor. In order to ensure that the auxiliary external air source is converged into the main air inlet source, the set pressure of the auxiliary external air source must be greater than the pressure of the main air inlet source, and the flow rate of the auxiliary external air source is less than that of the main air inlet source.
In order to right the supplementary external air supply's pressure and flow adjust and control, the supplementary external air supply intake manifold upper part is according to the direction of admitting air and is establish ties the installation in proper order, includes: a pneumatic cut-off valve, a pneumatic throttling film regulating valve and a gas distributor; furthermore, the pressure transmitter is arranged on the side of the main inlet duct in front of the inlet guide vanes of the centrifugal compressor. Firstly, arranging a pneumatic cut-off valve at an inlet of an external air source pipeline, wherein the pneumatic cut-off valve has a switching function; secondly, a pneumatic throttling film regulating valve is sequentially arranged behind the pneumatic cut-off valve and used for regulating the pressure and the flow of an external low-pressure air source before entering an inlet guide vane of the centrifugal compressor; the special gas distributor is arranged in the external gas source inlet pipeline behind the pneumatic throttling film regulating valve and used for controlling the flow rate of the external gas source gas, so that the gas flow distribution is uniform, the pressure fluctuation phenomenon is avoided, the gas is converged into the main inlet pipeline in a laminar flow mode, the gas flow disturbance caused by the fact that the external gas source is converged into the main inlet pipeline is avoided, and the stability of the inlet gas of the compressor is ensured.
The gas distributor can be designed into a cylindrical shape or a conical shape according to the technical requirements of design, installation and operation, has the same circular radian as an external gas source gas inlet pipeline, is assembled in the inner diameter of the external gas source gas inlet pipeline, and is made of stainless steel.
The further technical scheme of the invention is as follows: will pneumatic trip valve, pneumatic throttling film governing valve and the centrifugal compressor DCS centralized control system electric connection that supplementary external air supply intake pipe set up realize the full automatic control function of centrifugal compressor air intake system. The pneumatic cut-off valve has a switching function and can quickly and fully open or cut off the communication between the auxiliary external air source air inlet pipeline and the main air inlet pipeline. The pneumatic throttling film regulating valve can regulate the pressure and flow of gas entering an external gas source gas inlet pipeline on the inlet guide vane side of the centrifugal compressor; in order to avoid interference with a DCS integrated automatic control system of the centrifugal compressor, the pneumatic throttling membrane regulating valve is set to be a single control logic, is only controlled by a signal transmitted by a pressure transmitter, automatically regulates according to a pressure set value, and does not participate in the centralized control of an air inlet system of the centrifugal compressor.
A DCS control system of the centrifugal compressor is additionally provided with a pneumatic cutoff valve opening and closing feedback signal and a pneumatic throttling film regulating valve control logic. When the centrifugal compressor is in an operating state and the pneumatic cut-off valve is automatically and fully opened, the opening of the pneumatic throttling film regulating valve is automatically regulated according to the display value of the inlet air pressure transmitter of the centrifugal compressor in the DCS control system, so that the inlet air pressure of the centrifugal compressor is regulated. When the centrifugal compressor is in a shutdown state and the pneumatic cut-off valve is automatically and fully closed, the pneumatic throttling film regulating valve is automatically and fully closed. Meanwhile, the control logic of the pneumatic throttling film regulating valve is single control logic and does not participate in the control of inlet guide vanes and anti-surge valves of the centrifugal compressor. The inlet air inlet pressure value of the centrifugal compressor is transmitted to a bus assembly of a DCS (distributed control system) control system through a pressure transmitter in a 4-20 mA electric signal mode, and the opening degree of a pneumatic throttling film regulating valve is regulated through setting a special inlet air inlet pressure analog quantity input module and a special inlet air inlet pressure analog quantity output module control logic. In addition, the DCS control system is additionally provided with a high interlocking value of inlet air pressure of the centrifugal compressor, when the inlet air pressure of the centrifugal compressor is larger than the high interlocking value, the pneumatic stop valve is automatically closed, and an external low-pressure air source does not enter an inlet air inlet pipeline of the centrifugal compressor.
By adopting the technical scheme of the invention, when the centrifugal compressor runs, the inlet air inlet pressure of the centrifugal compressor can be ensured to reach the design value, the outlet pressure and the flow rate of the centrifugal compressor are in the design value range, meanwhile, the full-automatic and one-key operation of the centrifugal compressor is completely realized, and the requirements of metallurgy and chemical production are met.
Drawings
FIG. 1 is a schematic illustration of a prior art centrifugal compressor air intake process with a reflux valve;
FIG. 2 is a schematic of the inlet process for a prior art centrifugal compressor with a blow-down valve;
FIG. 3 is a schematic view of an embodiment of the present invention of a centrifugal compressor inlet process with a blow-down valve;
FIG. 4 is a schematic view of a second embodiment of the centrifugal compressor inlet process with a return valve according to the present invention;
description of the symbols: b1, a booster turboexpander; e2, heat exchanger; e3, liquefier; b4, centrifugal circulating nitrogen press; e4, gas distributor; v1, a pneumatic cut-off valve; v2, pneumatic throttling film regulating valve; p1, pressure transmitter; v3, product gas air valve; v4, centrifugal recycle nitrogen press return valve; v5, inlet guide vanes of a centrifugal circulation nitrogen press; v6, centrifugal cycle nitrogen press blow valve.
Detailed Description
The following describes the implementation of the technical solution of the present invention in detail with reference to fig. 3 and 4:
the first embodiment is as follows: 20000m matched with oxygen-nitrogen liquefaction device of Martin gas company3The implementation and operation of the technical scheme of the invention are specifically explained by taking the inlet gas inlet process of the/h centrifugal circulation nitrogen compressor as an example.
Example 20000m of the invention3The inlet air inlet process of the/h centrifugal circulation nitrogen press is provided with a vent valve, an external air source adopts an oxygen production and liquefaction device to heat low-pressure nitrogen, the pressure is 0.5MPa, and the purity of the nitrogen is the same as that of the product nitrogen in an original inlet air inlet pipeline.
Through field design and implementation, an external low-pressure nitrogen pipeline is connected to an original main air inlet pipeline before an inlet guide vane V5 of a circulating nitrogen compressor B4, and the inlet air pressure of an inlet of a B4 of the circulating nitrogen compressor is effectively improved. The pressure of the auxiliary external air source is greater than that of the main air inlet source, the flow is less than that of the main air inlet source, and the minimum external low-pressure nitrogen air input is led in to the maximum extent to achieve the effect of improving the inlet pressure.
Example 20000m of the invention3The air inlet process device of the/h centrifugal circulation nitrogen compressor B4 comprises: an inlet guide vane V5 is arranged in front of an air inlet pipeline of the circulating nitrogen press B4, an emptying valve V6 is arranged behind an exhaust pipeline of the circulating nitrogen press B4, an auxiliary external low-pressure nitrogen pipeline is connected to an original main air inlet pipeline in front of the inlet guide vane V5 of the circulating nitrogen press B4, and a pneumatic cut-off valve V1, a pneumatic throttling film adjusting valve V2, a gas distributor E4, a pressure transmitter P1 and the pressure transmitter P1 are sequentially connected in series to the external air inlet pipeline and arranged on the side of the air inlet pipeline in front of the inlet guide vane V5 of the circulating nitrogen press B4; the centrifugal circulating nitrogen press B4, the inlet guide vane V5 of the circulating nitrogen press, the pressure transmitter P1, the emptying valve V6, the pneumatic stop valve V1 in an external low-pressure nitrogen pipeline and the pneumatic throttling film regulating valve V2 are all automatically regulated and controlled by a DCS control system.
When the oxygen-nitrogen liquefying device of the horse steel is operated, 20000m3Statistics, analysis and calculation of the amplitude data of the inlet air pressure drop of the B4 inlet of the/h circulating nitrogen compressor, wherein the diameter of an external low-pressure nitrogen pipeline is designed to be 50MM, and the maximum low-pressure nitrogen flow is 400m3H is used as the reference value. The low-pressure nitrogen pipeline is made of stainless steel materials.
The air inlet side of an external low-pressure nitrogen pipeline is provided with 1 pneumatic shut-off valve V1, and the pneumatic shut-off valve V1 is a 2-position valve, so that full opening and full closing can be realized within 1 second. The outlet side of the external low-pressure nitrogen pipeline is provided with 1 pneumatic throttling film regulating valve V2, and the pressure and the flow of the external low-pressure nitrogen entering the air inlet pipeline at the inlet guide vane V5 side of the circulating nitrogen press B4 can be regulated. Through design, 1 cylindrical gas distributor E4 is designed and installed in an external low-pressure nitrogen pipeline at the outlet side of a pneumatic throttling membrane regulating valve V2, the circular radian of the gas distributor E4 is the same as that of the external low-pressure nitrogen pipeline, the gas distributor E4 is embedded in the inner diameter of the external low-pressure nitrogen pipeline and is made of stainless steel materials; the gas distributor E4 adjusts the flow rate of externally-connected low-pressure nitrogen, so that the low-pressure nitrogen which is converged into the inlet gas inlet pipeline of the inlet B4 of the centrifugal type circulating nitrogen press is uniformly distributed, the impeller of the circulating nitrogen press B4 is kept stable in gas inlet, and the fluctuation of gas flow is avoided.
A pneumatic cut-off valve V1 and a pneumatic throttling film regulating valve V2 automatic control module are additionally arranged in an original DCS control system of the oxygen-nitrogen liquefying device, and when a circulating nitrogen press B4 is in an operating state, the pneumatic cut-off valve V1 is controlled to be automatically and fully opened; according to the display value of the pressure transmitter, the opening of the valve is automatically adjusted by the pneumatic throttling film adjusting valve V2, and the inlet air pressure of the B4 inlet of the circulating nitrogen compressor is adjusted. When the circulating nitrogen compressor B4 is stopped, the pneumatic cut-off valve V1 is controlled to be automatically and fully closed, the pressure transmitter has no signal, and the pneumatic throttling film regulating valve V2 is automatically and fully closed. In addition, a circulating nitrogen compressor B4 inlet air pressure interlocking value is additionally arranged in a DCS control system of the oxygen-nitrogen liquefaction device, when the inlet air pressure of a circulating nitrogen compressor B4 is larger than the interlocking value, a pneumatic cut-off valve V1 is automatically closed, and auxiliary external low-pressure nitrogen does not enter a main inlet pipeline of an inlet of the circulating nitrogen compressor B4.
20000m3The fully automatic operation method of the inlet air inlet process of the/h centrifugal circulation nitrogen compressor B4 is as follows:
first, the oxygen-nitrogen liquefaction apparatus was put into operation and started at 20000m3A/h circulating nitrogen press B4 when the pressure is 20000m3When the rotating speed of the B4 of the/h circulating nitrogen compressor is increased to the set value of 1500r/min, 20000m is used for increasing the outlet pressure and the flow to the design values3The opening degree of an inlet guide vane V5 of the/h circulating nitrogen compressor B4 is adjusted to a normal operation opening degree, and an emptying valve V6 is adjusted to a full-closed state. 20000m3When the inlet air pressure of the B4 inlet of the/h circulating nitrogen compressor is less than the low alarm value of 4KPa, the DCS controls the linkage operation auxiliary external air inlet system module, the pneumatic cut-off valve V1 is automatically fully opened, the pneumatic throttling film regulating valve V2 is automatically opened, and the valve opening of the pneumatic throttling film regulating valve V2 is automatically regulated according to the pressure signal transmitted by the pressure transmitter P1. 20000m3The inlet air pressure of the/h circulating nitrogen press is automatically adjusted to a set value of 8KPa, and when the inlet air pressure exceeds the set value, the pneumatic cut-off valve V1 and the pneumatic throttling film adjusting valve V2 are automatically closed.
Decommissioning 20000m320000m for a/h circulating nitrogen press B043The opening degree of an inlet guide vane V5 of a/h circulating nitrogen compressor B04 is reduced to a minimum set value, an emptying valve V6 is adjusted to a full-open state, and the opening degree is 20000m3When the rotating speed of the/h circulating nitrogen compressor B04 is reduced to 0r/min, the pneumatic cut-off valve V1 and the pneumatic throttling film regulating valve V2 are automatically and fully closed.
Example two: 14500m matched with oxygen-nitrogen liquefying device of Martin gas company3The inlet gas inlet process of a/h centrifugal circulation nitrogen press is taken as an example,the implementation and operation of the technical scheme of the invention are concretely explained.
Inventive example 14500m3The inlet air inlet process of the/h centrifugal circulation nitrogen compressor is provided with a reflux valve, an external air source adopts an oxygen production and liquefaction device to heat low-pressure nitrogen, the pressure is 0.5MPa, and the purity of the nitrogen is the same as that of nitrogen in a medium-pressure pipe network in an original main air inlet pipeline.
Warp 14500m3After statistics, analysis and calculation of the amplitude data of the inlet air pressure drop of the B4 inlet of the/h circulating nitrogen press, the diameter of an external low-pressure nitrogen pipeline is designed to be 45mm, the external low-pressure nitrogen pipeline is connected to a main air inlet pipeline at 0.5m on the V5 side of a B4 inlet guide vane of the circulating nitrogen press, and the design value of the maximum low-pressure nitrogen flow is 350m3H is used as the reference value. The low-pressure nitrogen pipeline is made of 304 stainless steel materials.
The air inlet side of an external low-pressure nitrogen pipeline is provided with 1 pneumatic stop valve V1, the valve diameter is designed to be 45mm, and the pneumatic stop valve V1 is a 2-position valve, so that full opening and full closing can be realized within 1 second. The outlet side of an external low-pressure nitrogen pipeline is provided with 1 pneumatic throttling film regulating valve V2, and the pneumatic throttling film regulating valve V2 is provided with a speed increaser which can be accurately regulated to 14500m3And the pressure and the flow of low-pressure nitrogen are externally connected in an air inlet pipeline on the V5 side of an inlet guide vane of the/h circulating nitrogen compressor B4. 1 cylindrical gas distributor E4 is designed and installed in an external low-pressure nitrogen pipeline on the outlet side of the pneumatic throttling membrane regulating valve V2, the circular radian of the gas distributor E4 is the same as that of the external low-pressure nitrogen pipeline, the gas distributor E is embedded in the inner diameter of the external low-pressure nitrogen pipeline and is purchased from 4 groups of gas distribution plates, and the material is 304 stainless steel materials. The gas distributor E4 adjusts the flow rate of externally-connected low-pressure nitrogen, so that the low-pressure nitrogen which is converged into the main gas inlet pipeline of the centrifugal circulation nitrogen compressor B4 is uniformly distributed, and the stable gas inlet of the impeller of the nitrogen compressor B4 is ensured.
A pneumatic cut-off valve V1 and a pneumatic throttling film regulating valve V2 automatic control module are additionally arranged in a DCS control system of the oxygen-nitrogen liquefying device, and full-automatic control is realized through an opening and closing feedback signal of the pneumatic cut-off valve V1 and a control logic of the pneumatic throttling film regulating valve V2. At 14500m3The pneumatic cut-off valve V1 is automatically and fully opened under the operation state of the/h circulating nitrogen compressor B4, and the pneumatic throttling film regulating valve V2 automatically opens according to the display value of an air inlet pressure transmitter P1 in a DCS control systemThe opening of the valve is adjusted to meet the requirement of inlet air pressure of the inlet of the circulating nitrogen compressor B4. At 14500m3When the/h circulating nitrogen compressor B4 is in a stop state, the pneumatic stop valve V1 is automatically and fully closed, and the pneumatic throttling film regulating valve V2 is automatically and fully closed. Meanwhile, the control logic of the pneumatic throttling film regulating valve V2 is a special control logic, and does not participate in the control of the inlet guide vane V5 and the return valve V4 of the circulating nitrogen compressor B4, 14500m3And the inlet air pressure value of the/h circulating nitrogen compressor B04 is transmitted to a bus component in a DCS control system through a pressure transmitter P1 in the form of a 4-20 mA electric signal, and the opening degree of a pneumatic throttling film regulating valve V2 is regulated by setting special inlet air pressure analog quantity input and output module control logic.
14500m according to example of the present invention3The fully automatic operation method of the inlet air inlet process of the/h centrifugal circulation nitrogen compressor B4 is as follows:
startup 14500m3The/h circulation nitrogen compressor B4 inlet air inlet device. At 14500m3When the rotating speed of the/h circulating nitrogen press B4 is increased to a set value of 1500r/min, in order to enable the outlet pressure and the flow of the nitrogen press B04 to be increased to design values, the opening degree of a guide vane V5 at the inlet of the nitrogen press B4 is adjusted to a normal operation value, a return valve V4 is adjusted to a full-closed state, when the inlet air pressure of the nitrogen press B4 is smaller than a low alarm value of 5KPa, a pneumatic cut-off valve V1 is automatically opened, a pneumatic throttling film regulating valve V2 is automatically opened, the inlet air pressure of the nitrogen press B4 is automatically adjusted to a set value of 10KPa, and when the inlet air pressure is increased to be larger than an interlocking value of 12KPa, a pneumatic cut-off valve V1 and a pneumatic throttling film regulating valve V2 are automatically closed.
14500m out of service3When the inlet air inlet device of the B4 inlet of the circulating nitrogen compressor is started, 14500m3A/h circulation nitrogen compressor B04 return valve V4, the opening degree of an inlet guide vane V5 is reduced, the pressure of the nitrogen compressor B4 is relieved, and the pressure is increased to 14500m3When the rotating speed of the/h circulating nitrogen compressor B4 is reduced to 0r/min, the switch of the control module is automatically closed by the pneumatic cut-off valve V1 and the pneumatic throttling film regulating valve V2.
Claims (6)
1. The air inlet system of the centrifugal compressor comprises two air inlet pipelines, wherein one air inlet pipeline is a main air inlet source pipeline, namely an inlet air inlet pipeline of the original centrifugal compressor, the other air inlet pipeline is a low-pressure air source pipeline which is introduced from the outside of the original air inlet system and is provided with the same gas medium, and is an auxiliary external air source air inlet pipeline which is connected to the main air inlet pipeline in front of an inlet guide vane of the centrifugal compressor.
2. A centrifugal compressor air intake system according to claim 1, wherein: the pressure of the auxiliary external air source is greater than that of the main air inlet source, and the flow is less than that of the main air inlet source.
3. A centrifugal compressor air intake system according to claim 1, wherein: supplementary external air supply intake pipe is last the part according to the direction of admitting air and establishes ties the installation in proper order, include: a pneumatic cut-off valve, a pneumatic throttling film regulating valve and a gas distributor; furthermore, the pressure transmitter is arranged on the side of the main inlet duct in front of the inlet guide vanes of the centrifugal compressor.
4. A centrifugal compressor air intake system according to claim 3, wherein: the gas distributor arranged on the auxiliary external gas source gas inlet pipeline is cylindrical or conical, has the same circular radian as the external gas source gas inlet pipeline, is assembled in the inner diameter of the external gas source gas inlet pipeline, and is made of stainless steel.
5. A centrifugal compressor air intake system according to claim 3, wherein: the pneumatic stop valve, the pneumatic throttling film regulating valve and the pressure transmitter are arranged on the auxiliary external air source air inlet pipeline, are arranged on the main air inlet pipeline side in front of the inlet guide vane of the centrifugal compressor, are electrically connected with the DCS centralized control system of the centrifugal compressor and are incorporated into the air inlet full-automatic control system of the centrifugal compressor.
6. A centrifugal compressor air intake system according to claim 5, wherein: the pneumatic throttling film regulating valve is automatically controlled to be single logic control, and automatically regulated according to a pressure set value according to a signal transmitted by the pressure transmitter.
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| CN202210012789.7A CN114352566A (en) | 2022-01-07 | 2022-01-07 | Air inlet system of centrifugal compressor |
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| CN202210012789.7A CN114352566A (en) | 2022-01-07 | 2022-01-07 | Air inlet system of centrifugal compressor |
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