WO2024047780A1 - Dispositif de compression d'air - Google Patents

Dispositif de compression d'air Download PDF

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Publication number
WO2024047780A1
WO2024047780A1 PCT/JP2022/032716 JP2022032716W WO2024047780A1 WO 2024047780 A1 WO2024047780 A1 WO 2024047780A1 JP 2022032716 W JP2022032716 W JP 2022032716W WO 2024047780 A1 WO2024047780 A1 WO 2024047780A1
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WO
WIPO (PCT)
Prior art keywords
air
return
compressor
buffer tank
compression device
Prior art date
Application number
PCT/JP2022/032716
Other languages
English (en)
Japanese (ja)
Inventor
樹央 水野
智夫 鈴木
良郎 安齊
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Priority to PCT/JP2022/032716 priority Critical patent/WO2024047780A1/fr
Priority to TW112125035A priority patent/TW202411537A/zh
Publication of WO2024047780A1 publication Critical patent/WO2024047780A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity

Definitions

  • the present invention relates to an air compression device.
  • Patent Document 1 states, ⁇ By returning a portion of the discharged gas to the suction side of the rotary compressor to increase the suction pressure, the flow rate is adjusted such that the discharge pressure can be increased while maintaining a predetermined compression ratio.
  • An oil-free rotary compressor characterized in that a return gas pipe provided with a control means is branched from the discharge gas pipe and connected to the suction side of the rotary compressor.'' (see paragraph 1) is disclosed. There is.
  • the air compressor described in Patent Document 1 directly returns a portion of the discharged air to the air suction side via piping, resulting in unstable suction pressure.
  • An object of the present invention is to stabilize suction pressure in an air compression device.
  • An air compression device that is one aspect of the present invention includes a compressor that compresses intake air taken in from an intake port through an air intake pipe, a heat exchanger that cools the compressed air, and a heat exchanger that cools the compressed air. It is characterized by comprising an air return pipe that returns part of the air as return air to the air suction pipe, and a buffer tank provided at a predetermined position of the air return pipe to temporarily store at least the return air. do.
  • FIG. 1 is a diagram showing the configuration of an air compressor according to a first embodiment.
  • FIG. 3 is a flowchart of discharge air return control in Example 1.
  • FIG. 3 is a diagram showing the pressure, flow rate, temperature, and density at each location in the air compression device of Example 1.
  • FIG. 2 is a diagram showing the configuration of an air compressor according to a second embodiment.
  • 7 is a flowchart of discharge air return control in Example 2.
  • FIG. FIG. 3 is a diagram showing the pressure, flow rate, temperature, and density at each location in the air compression device of Example 2.
  • FIG. 3 is a diagram showing the configuration of an air compressor according to a third embodiment.
  • FIG. 3 is a diagram showing the configuration of an air compressor according to a third embodiment.
  • FIG. 7 is a flowchart of discharge air return control in Example 3; 3 is a diagram showing the pressure, flow rate, temperature, and density at each location in the air compression device of Example 3.
  • FIG. 7 is a flowchart of other discharge air return control in Examples 1 and 3.
  • FIG. 7 is a flowchart of another discharge air return control according to the second embodiment.
  • Embodiment 1 of the present invention will be described below with reference to FIGS. 1, 2, and 3.
  • FIG. 1 is a diagram showing the configuration of an air compression device of Example 1, and the solid line in the diagram indicates the flow of air in the air compression device.
  • the area within the broken line 19 is inside the package of the air compressor. Outside air taken in from the air intake port 1 passes through an air filter 2, a check valve 3, and a buffer tank 4, and is compressed by a compressor 7 (a single-stage machine in the main body of the air compressor). The compressed high-temperature air is cooled by an intercooler (heat exchanger) 11, and further compressed to a target pressure by a compressor 8 (a two-stage machine in the main body of the air compressor).
  • a compressor 7 a single-stage machine in the main body of the air compressor.
  • the compressed high-temperature air is cooled by an intercooler (heat exchanger) 11, and further compressed to a target pressure by a compressor 8 (a two-stage machine in the main body of the air compressor).
  • the suction pressure is measured by the pressure gauge 6, the intermediate pressure by the pressure gauge 16, the discharge pressure by the pressure gauge 13, and the return air by the pressure gauge 20. Get the value.
  • Control of the regulating valve 5 is performed by a control panel 15 via a control line.
  • the check valve 17 is for preventing the air from the customer side from flowing back during unloading, and 18 is an air outlet during unloading.
  • the air compression device is provided with a thermometer 21, a thermometer 22, a thermometer 23, and a thermometer 24, respectively.
  • Thermometer 21 measures the intake air temperature.
  • Thermometer 22 measures the return air temperature.
  • the thermometer 23 measures the first stage discharge temperature.
  • Thermometer 24 measures the discharge temperature.
  • the buffer tank 4 is a place where air taken in from the outside air and part of the discharged air are mixed and the pressurized intake air is stored. By once storing air in the buffer tank 4, air with stable pressure can be sent to the compressor 7 (single-stage machine). This prevents the adjustment valve 5 from chattering.
  • chattering refers to the adjustment valve 5 repeatedly opening and closing in order to finely adjust the amount of return air due to changes in the usage amount of discharge air or fluctuations in discharge pressure. Chattering shortens the life of the regulating valve 5 and causes control errors.
  • a check valve 3 is attached to the inlet of the buffer tank 4 in order to prevent part of the discharged air sent into the buffer tank 4 from flowing back through the air intake port 1.
  • An adjustment valve 5 is attached to the air return pipe 10 that returns part of the discharged air, and by opening and closing this adjustment valve 5, the amount returned to the buffer tank 4 can be adjusted. However, if the discharged air is directly fed into the regulating valve 5, the valve will be opened and closed while receiving high-pressure air, which is likely to lead to deterioration or failure of the regulating valve 5. To prevent this, an orifice 9 is attached to the air return pipe 10. The orifice 9 also has the role of preventing the regulating valve 5 from opening and closing excessively in response to small fluctuations in discharge pressure when controlling the return flow rate.
  • FIG. 2 shows the control flow of the regulating valve 5 of the first embodiment.
  • a control panel 15 controls a series of adjustment valves 5. The control flow will be explained below.
  • normal operation S202 is performed with the adjustment valve 5 in the closed state.
  • the control panel 15 determines whether the discharge air pressure (P d ) measured by the pressure gauge 13 is around a preset target pressure (target value) (for example, within ⁇ 10% of the target pressure) (S203). . If P d is around the target pressure (S203: Yes), normal operation S202 is continued, and it is determined whether P d is around the target pressure at predetermined time intervals in S203.
  • target value for example, within ⁇ 10% of the target pressure
  • the adjustment valve 5 is adjusted (S204). Specifically, for example, if the target pressure is 90% or less, the adjustment valve 5 is opened by a predetermined amount to increase the amount of compressed air returned to the buffer tank 4, and if the target pressure is 110% or more, the adjustment valve 5 is opened. is closed by a predetermined amount to reduce the amount of compressed air returned to the buffer tank 4.
  • the compressed air returns to the buffer tank 4, the first-stage suction air pressure of the compressor 7 increases, and the air pressure (suction pressure P s ) coming out of the buffer tank 4 measured by the pressure gauge 6 becomes the preset target pressure. It is determined whether the pressure is close to (target value) (for example, within ⁇ 10% of the target pressure) (S205).
  • the adjustment valve 5 is further adjusted (S204). Specifically, for example, if the target pressure is 90% or less, the adjustment valve 5 is opened by a predetermined amount to increase the amount of compressed air returned to the buffer tank 4, and if the target pressure is 110% or more, the adjustment valve 5 is opened. By closing by a predetermined amount and reducing the amount of compressed air returned to the buffer tank 4, the first stage suction air pressure of the compressor 7 is adjusted to be around the target pressure.
  • the suction can be achieved while protecting the compressor 8 with a simple configuration. Pressure can be stabilized.
  • a control panel 15 controls a series of adjustment valves 5.
  • step 206 is omitted.
  • the other steps are almost the same as the control flow shown in FIG. 2, so their explanation will be omitted.
  • the amount of opening and closing of the regulating valve 5 is set to a predetermined value, and there is a concern that it will take time to determine whether the pressure in each part has reached the target pressure after opening and closing the regulating valve 5.
  • step 206 is omitted to speed up the processing.
  • FIG. 3 shows the pressure P, volumetric flow rate Q, mass flow rate G, temperature T, and air density ⁇ at each position inside the package 19 of the air compressor.
  • the first stage suction flow rate is the sum of the suction flow rate and the return flow rate, it can be expressed by the following equation (1) using Boyle-Charles' law.
  • the suction air pressure Ps is set to 80 [kPa] (atmospheric pressure near an altitude of 2000 m), and the first stage suction pressure Ps+r is increased to 100 [kPa] using return air.
  • suction temperature Ts 303.15K
  • density ⁇ s 0.92kg/m 3
  • return temperature Tr 423.15K
  • density ⁇ r 6.43kg.
  • the first-stage suction flow rate Qs+r 50m 3 /min
  • the suction temperature Ts+r 303.15K
  • the density ⁇ s+r 1.15kg/m 3
  • the suction air amount Qs and the first-stage air end are Assuming that the intake air amount Qs+r is the same, the return flow rate Qr can be calculated according to the following equation (3).
  • Embodiment 2 of the present invention will be described below with reference to FIGS. 4, 5, and 6.
  • FIG. 4 is a diagram showing the configuration of the air compression device of Example 2, and the solid line in the diagram indicates the flow of air in the air compression device.
  • Embodiment 2 has a structure in which a part of the discharged air is returned between the compressor 7 (first stage machine) and the compressor 8 (second stage machine) (between the heat exchanger 11 and the second stage suction port).
  • the configuration that differs from the air compressor of Example 1 shown in FIG. 1 is the arrangement of the buffer tank 4 and check valve 3. Furthermore, in the second embodiment, a pressure sensor 25 and a thermometer 26 are newly arranged.
  • the pressure sensor 25 is a sensor that measures the two-stage suction pressure (Pc+r), and is connected to the control unit 15 by a dotted line.
  • the thermometer 26 is a thermometer that measures the two-stage suction air temperature (Tc+r), and is connected to the control unit 15 by a dotted line.
  • An outlet for air from the buffer tank 4 is provided between the compressors 7 and 8, and the buffer tank 4 temporarily stores return air and sends the return air to the compressor 8.
  • the check valve 3 is provided on the outlet side of the buffer tank 4 to prevent the air cooled by the heat exchanger 11 from flowing back into the buffer tank 4.
  • FIG. 5 shows the control flow of the regulating valve 5 of the second embodiment.
  • control flow is almost the same as the control flow of the regulating valve 5 of Example 1 shown in FIG. 2, and the difference is that the reference pressure after adjusting the regulating valve 5 is the second stage suction pressure P1+r (see S205). .
  • the other steps are almost the same as those in the first embodiment shown in FIG. 2, so their explanation will be omitted.
  • a control panel 15 controls a series of adjustment valves 5.
  • step 206 is omitted.
  • the other steps are almost the same as the control flow shown in FIG. 5, so their explanation will be omitted.
  • the amount of opening and closing of the regulating valve 5 is set to a predetermined value, and there is a concern that it will take time to determine whether the pressure in each part has reached the target pressure after opening and closing the regulating valve 5.
  • step 206 is omitted to speed up the processing.
  • FIG. 6 shows the pressure P, volume flow rate Q, mass flow rate G, temperature T, and air density ⁇ at each position. Since the first-stage suction flow rate is the sum of the suction flow rate and the return flow rate, it can be expressed by the following equation (5) using Boyle-Charles' law.
  • Tc is the outlet temperature of the intercooler (heat exchanger) 11.
  • Equation (8) shows that the return flow rate requires about 20% of the discharge flow rate, and as in Example 1, it can be used to determine the opening/closing amount of the adjustment valve 5 for adjusting the return flow rate in S204. can.
  • Embodiment 3 of the present invention will be described below with reference to FIGS. 7, 8, and 9.
  • FIG. 7 is a diagram showing the configuration of the air compression device of Example 3, and the solid line indicates the flow of air in the air compression device.
  • the main configuration different from the air compression device of Example 1 shown in FIG. 1 is that the compressor 8 (two-stage unit) and heat exchanger 12 of the air compression device main body are not present. In this way, the air compression device of Example 3 is a single-stage air compression device.
  • outside air is taken in from an air intake port 1, passes through an air filter 2, a check valve 3, and a buffer tank 4, and is compressed by a compressor 7.
  • the compressed high-temperature air is cooled by the heat exchanger 11 and then discharged to the outside from the discharge port 14.
  • FIG. 8 shows the control flow of the regulating valve 5 of the third embodiment.
  • ⁇ i1 is the compression ratio of the single-stage machine, and indicates the ratio Pd/P1 of the discharge pressure and the suction pressure.
  • the other steps are almost the same as those in the first embodiment shown in FIG. 2, so their explanation will be omitted.
  • the amount of opening and closing of the regulating valve 5 is set to a predetermined value, and there is a concern that it will take time to determine whether the pressure in each part has reached the target pressure after opening and closing the regulating valve 5.
  • step 206 is omitted to speed up the processing.
  • FIG. 9 shows the pressure P, volume flow rate Q, mass flow rate G, temperature T, and air density ⁇ at each position. Since the first-stage suction flow rate is the sum of the suction flow rate and the return flow rate, it can be expressed by the following equation (9) using Boyle-Charles' law.
  • the suction air pressure Ps is set to 80 [kPa] (atmospheric pressure near an altitude of 2000 m), and the suction pressure Ps+r is increased to 100 [kPa] using return air.
  • Equation (12) shows that the return flow rate requires about 20% of the discharge flow rate, and as in Example 1, it can be used to determine the opening/closing amount of the adjustment valve 5 for adjusting the return flow rate in S204. can.
  • the suction pressure can be stably increased by returning a portion of the discharged air to the buffer tank installed on the suction side. Furthermore, chattering of the regulating valve 5 attached to the air return pipe can be prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

L'invention concerne un dispositif de compression d'air comprenant un réservoir tampon qui est disposé à une position prescrite d'un tuyau de retour d'air et stocke temporairement de l'air de retour.
PCT/JP2022/032716 2022-08-31 2022-08-31 Dispositif de compression d'air WO2024047780A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2022/032716 WO2024047780A1 (fr) 2022-08-31 2022-08-31 Dispositif de compression d'air
TW112125035A TW202411537A (zh) 2022-08-31 2023-07-05 空氣壓縮裝置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/032716 WO2024047780A1 (fr) 2022-08-31 2022-08-31 Dispositif de compression d'air

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WO2024047780A1 true WO2024047780A1 (fr) 2024-03-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166785A (ja) * 1984-02-10 1985-08-30 Hitachi Ltd 無給油式回転圧縮装置
JP2005069013A (ja) * 2003-08-22 2005-03-17 Tokyo Electric Power Co Inc:The ガス供給装置及びその制御方法
US20190085854A1 (en) * 2015-07-09 2019-03-21 Nuovo Pignone Tecnologie Srl Compressor system with a gas temperature control at the inlet of the anti-surge line and relevant method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166785A (ja) * 1984-02-10 1985-08-30 Hitachi Ltd 無給油式回転圧縮装置
JP2005069013A (ja) * 2003-08-22 2005-03-17 Tokyo Electric Power Co Inc:The ガス供給装置及びその制御方法
US20190085854A1 (en) * 2015-07-09 2019-03-21 Nuovo Pignone Tecnologie Srl Compressor system with a gas temperature control at the inlet of the anti-surge line and relevant method

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