KR20120096748A - Compressing unit having anti-surge logic and multi-stage compressing apparatus comprising the same - Google Patents

Abstract

PURPOSE: A compression unit having an antisurge logic and a multi-stage compression device are provided to efficiently prevent a stall of a compressor and to prevent a pressure loss caused by measuring a flow rate passing through the compressor. CONSTITUTION: A compression unit having an antisurge logic comprises a compressor(100), a main flow path(200), a bypass flow path(300), a valve(400), and a flow meter. The main flow path penetrates through the compressor. The bypass flow path detours the compressor and connects an inlet and an outlet of the compressor. The valve controls opening/closing the bypass flow path. The flow meter is arranged in the bypass flow path.

Description

Compression unit having anti-surge logic and multistage compression apparatus having same {Compressing unit having anti-surge logic and multi-stage compressing apparatus comprising the same}

The present invention relates to a compression unit for compressing a fluid and a multistage compression device having the same, and more particularly, to a compression unit having an anti-surge logic and a multistage compression device having the same.

Compressors for compressing fluids such as air or fuel gas are widely used in the industry.

On the other hand, the compressor may cause a phenomenon in which the compression efficiency drops rapidly when the flow rate is too low or the pressure of the outflow fluid is too high, thereby limiting the compressor operation flow rate and the outflow fluid pressure to a predetermined range. It is very important to.

BACKGROUND Compression units with anti-surge logic with bypass flow paths are known to prevent stalling of the compressor.

1 is a schematic diagram of a compression unit having a conventional anti-surge logic. Referring to FIG. 1, a compression unit 1 having a conventional anti-surge logic includes a compressor 10, a main flow path 20, The bypass flow path 30, the valve 40, the flowmeter 60, the 1st pressure gauge 70, the 2nd pressure gauge 80, and the control part 50 are provided.

The compressor 10 is for compressing a fluid and may be a compressor of various types such as centrifugal type or axial flow type.

The main flow path 20 passes through the compressor 10 as a fluid flow path. That is, the fluid is introduced into the compressor 10 through the flow path, and then the pressure is increased to flow out of the compressor 10.

The bypass flow path 30 connects the outlet of the compressor 10 and the inlet of the compressor 10 without passing through the compressor 10. That is, when the bypass flow path 30 is opened, the fluid flowing out of the compressor 10 flows to the inlet of the compressor 10, and the difference between the pressure at the outlet side of the compressor 10 and the pressure at the inlet side is reduced and is introduced into the compressor. The flow rate is increased.

The valve 40 is for controlling the opening and closing of the bypass flow path 30, and may be made of an electromagnetic valve such as a solenoid valve to enable electronic control.

The flowmeter 60 is disposed in the main flow passage 20 on the inlet side of the compressor 10, and is disposed downstream from the portion where the bypass flow passage 30 and the main flow passage 20 meet. That is, the flow meter 60 measures the flow rate of the fluid flowing into the compressor 10.

The first pressure gauge 70 is disposed downstream of the flow meter 60 to measure the pressure of the fluid flowing into the inlet of the compressor 10.

The second pressure gauge 80 measures the pressure of the fluid flowing out of the compressor 10.

The controller 50 may control the opening and closing of the valve 40 based on the measured values of the flowmeter 60, the first pressure gauge 70, and the second pressure gauge 80 so as to prevent stall of the compressor 10. . That is, the control unit 50 is a pressure difference between the pressure at the inlet side of the compressor 10 measured by the first pressure gauge 70 and the pressure at the outlet side measured by the second pressure gauge 80 is greater than or equal to a predetermined size. When the inflow rate of 10) is equal to or less than a predetermined size, the valve 40 is opened to allow fluid to pass through the bypass flow path 30. Accordingly, the compression unit 1 having the conventional anti-surge logic can effectively prevent stall of the compressor 10 by controlling the flow rate of the bypass flow path 30.

Meanwhile, the conventional compression unit 1 having anti-surge logic needs to accurately measure the flow rate flowing into the compressor 10. For this purpose, the compression unit 1 has a predetermined amount in the main flow path 10 on the inlet side of the compressor 10. A straight section 22 over the length should be provided.

Accordingly, the compression unit 1 having the conventional anti-surge logic becomes large in size so that a predetermined linear distance can be secured in the flow path on the inlet side of the compressor 10. In other words, the conventional compression unit 1 with anti-surge logic can be said to be disadvantageous in miniaturization.

The disadvantage of the compression unit 1 having such a conventional anti-surge logic may be more prominent when a multistage compression system is constructed by connecting them in multiple stages. Hereinafter, a conventional multi-stage compression system in which a compression unit 1 having conventional anti-surge logic is connected in series multi-stage will be described.

FIG. 2 is a schematic diagram of a conventional multistage compression device having a multistage compressor, and referring to FIG. 2, a conventional multistage compression device 2 is provided with the anti-surge logic of FIG. It can be seen that the compression unit 1 is provided. That is, the conventional multistage compression apparatus 2 includes a plurality of compressors 20a, 20b, and 20c provided in multiple stages in the main flow path 20, and bypass flow paths 30a and 30b corresponding to the respective compressors 20a, 20b, and 20c. 30c), valves 40a, 40b, 40c, flow meters 60a, 60b, 60c, first pressure gauges 70a, 70b, 70c, and second pressure gauges 80a, 80b, 80c.

The plurality of compressors 20a, 20b, 20c are driven in combination with a pinion gear 94 coupled to a bull gear 90 connected to a drive source 92.

In such a conventional multistage compression apparatus 2, straight sections 22a, 22b, 22c of predetermined length are provided on the inlet side of each compressor 10 so that the flow rates of the compressors 20a, 20b, and 20c can be accurately measured. Is provided. Therefore, the overall volume of the multistage compression apparatus 2 can be significantly increased due to the securement of the straight sections 22a, 22b, and 22c.

In addition, since the flow meters 60a, 60b, and 60c are usually installed in the flow path and partially obstruct the flow of the fluid, there is a problem that the pressure of the fluid is lost.

In order to solve the above problem, some aspects of the present invention can effectively prevent the stall of the compressor, advantageous in miniaturization, and has anti-surge logic that can effectively prevent the pressure loss caused by measuring the flow rate through the compressor. It is an object to provide one compression unit and a multistage compression device.

In order to achieve the above object, a compression unit having anti-surge logic with anti-surge logic according to an embodiment of the present invention includes a compressor, a main flow path passing through the compressor, and bypassing the compressor. And a bypass passage connecting the inlet of the inlet to the outlet of the compressor, a valve for controlling the opening and closing of the bypass passage, and a flow meter disposed in the bypass passage.

In addition, in order to achieve the above object, a multistage compression apparatus according to another embodiment of the present invention, a plurality of compressors connected in series multiple stages, a main flow passage through the plurality of compressors, and corresponds to each of the compressors, A plurality of bypass flow paths connecting the inlet port of each compressor and the outlet port of each compressor to bypass each compressor, a plurality of valves disposed in each bypass flow path and controlling opening and closing of each bypass flow path; A plurality of bypass flowmeters are provided in each of the bypass flow paths.

According to the compression unit and the multi-stage compression apparatus with anti-surge logic according to some aspects of the present invention, the stall of the compressor can be effectively prevented, which is advantageous in miniaturization, and the pressure loss caused by measuring the flow rate through the compressor. can do.

1 is a schematic diagram of a compression unit with conventional anti-surge logic.
2 is a schematic diagram of a conventional multistage compression apparatus.
3 is a schematic diagram of a compression unit with anti-surge logic in accordance with one embodiment of the present invention.
4 is a schematic diagram of a multi-stage compression apparatus according to another embodiment of the present invention.
FIG. 5 is a simplified view of the multistage compression apparatus of FIG. 4 to explain a method of calculating the flow rate of each compressor.

Hereinafter, a compression unit having anti-surge logic according to an embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a schematic diagram of a compression unit with anti-surge logic in accordance with one embodiment of the present invention.

Referring to FIG. 3, the compression unit 3 having the anti-surge logic according to the present embodiment includes a compressor 100, a main flow path 200, a bypass flow path 300, a valve 400, a flow meter 600, The first pressure gauge 700, the second pressure gauge 800, and the controller 500 are provided.

The compressor 100 is for compressing a fluid and may be a compressor 100 of various types such as centrifugal type or axial flow type.

The main flow path 200 is a flow path through which the fluid passing through the compressor 100 flows. That is, the fluid flows along the main flow path 200, flows into and out of the compressor 100, and increases in pressure as it flows out of the compressor 100.

The bypass flow path 300 connects the outlet of the compressor 100 and the inlet of the compressor 100 without passing through the compressor 100. That is, the bypass flow path 300 bypasses the compressor 100 and connects the outlet of the compressor 100 with the inlet of the compressor 100. When the bypass flow path 300 is opened, part or all of the flow rate of the outlet of the compressor 100 may be re-introduced into the compressor 100 via the bypass flow path 300. In the bypass passage 300, a straight section 320 having a predetermined length or more is formed to install the flowmeter 600. Since the bypass flow path 300 bypasses the compressor 100 without passing through it, it is very easy to secure a straight section as compared with the main flow path 200.

The valve 400 is for controlling the opening and closing of the bypass flow path 300, and may be formed of an electromagnetic valve such as a solenoid valve to enable electronic control.

The flowmeter 600 is disposed in the bypass flow path 300 to measure the flow rate flowing through the bypass flow path 300, and is disposed in the straight section 320 provided in the bypass flow path 300. The flowmeter 600 includes various types of flowmeters such as differential pressure flowmeters such as orifice flowmeters or venturi flowmeters, flowmeters of flow rate estimation methods such as turbine meters or propeller meters, or volumetric flowmeters such as oscillating gear flowmeters or vibrating piston flowmeters. May be employed. In addition, a flowmeter may be a flowmeter which measures the volume flow volume of a fluid, and may be a flowmeter which measures the mass flow volume of a fluid.

On the other hand, since the bypass flow path 300 typically has a smaller flow rate than the main flow path 200, the flow meter 600 has a smaller capacity than the flow meter 60 of the compression unit 1 having the conventional anti-surge logic. It may be to have. Therefore, the straight section 320 of the bypass flow path 300 required for the flow rate measurement can be further shortened.

The first pressure gauge 700 is disposed on the upstream side of the compressor 100 in the main flow path 200 so as to measure the pressure of the fluid flowing into the compressor 100. As the first pressure gauge 700, various types of pressure gauges such as a liquid pressure gauge, a ring balance pressure gauge, a deadweight pressure gauge, a bourdon tube pressure gauge, a bellows pressure gauge, a diaphragm pressure gauge, an electric resistance pressure gauge, and a piezoelectric pressure gauge may be used.

The second pressure gauge 800 is disposed on the downstream side of the compressor 100 in the main flow path 200 so that the pressure of the fluid flowing out of the compressor 100 can be measured. As the second pressure gauge 800, a pressure gauge of the same type as the first pressure gauge 700 may be used.

The control unit 500 is electrically connected to the first pressure gauge 700, the second pressure gauge 800, and the flow meter 600 to input the measured values of the first pressure gauge 700, the second pressure gauge 800, and the flow meter 600. And control the opening and closing of the valve 400 according to the measured value. For example, the controller 500 may prevent the stall of the compressor 100. When the difference between the pressure measured by the first pressure gauge 700 and the second pressure gauge 800 approaches the stall pressure of the compressor 100, the valve ( The bypass flow path 300 may be opened by opening 400. When the valve 400 is opened, the fluid is re-introduced from the outlet of the compressor 100 to the inlet through the bypass flow path 300, so that the pressure difference between the outlet and the inlet is reduced, and the flow rate passing through the compressor 100 increases to increase the flow rate of the compressor ( Stall of 100) is prevented.

When the bypass flow path 300 is opened to prevent stall of the compressor 100, the amount of fluid passing through the bypass flow path 300 is measured by the flow meter 600. If the flow rate flowing into the main flow path 200 is known, the amount of fluid passing through the compressor 100 can be easily calculated by adding the flow rate of the bypass flow path 300 to the flow rate of the main flow path 200.

Since the compression unit 3 having the anti-surge logic of the present embodiment is provided with the flow meter 600 in the bypass flow path 300, a straight section for the flow meter 600 is not required in the main flow path 200. Instead, the compression unit 3 having the anti-surge logic of the present embodiment requires a straight section 320 in the bypass flow path 300, but the bypass flow path 300 bypasses the compressor 100 so that the anti-surge logic It is possible to easily secure the straight section 320 without increasing the overall volume of the compression unit (3) having a. Therefore, the compression unit 3 with the anti-surge logic of this embodiment is very advantageous for miniaturization as compared with the compression unit 1 with the conventional anti-surge logic.

In addition, since the compression unit 3 having the anti-surge logic of the present embodiment does not need to install the flow meter 600 in the main flow path 200, pressure loss due to the flow meter 600 does not occur in the main flow path 200. Do not. Therefore, the compression efficiency can be further superior to that of the compression unit 3 having the conventional anti-surge logic.

Next, a multi-stage compression apparatus according to another embodiment of the present invention will be described with reference to the drawings.

4 is a schematic diagram of a multi-stage compression apparatus according to another embodiment of the present invention.

Referring to FIG. 4, the multistage compression device 4 according to the present embodiment is a compression unit 3 having the anti-surge logic of FIG. 3 connected in series, and includes a plurality of compressors 100a disposed in the main flow path 200. , 100b, 100c and main flowmeters 250, bypass flow paths 300a, 300b, 300c, valves 400a, 400b, 400c, and bypass flowmeters 600a, 600b, 600c corresponding to the respective compressors 100. ), First pressure gauges 700a, 700b, 700c, second pressure gauges 800a, 800b, 800c, and a control unit (not shown).

The plurality of compressors 100a, 100b, and 100c are connected in series multiple stages to the main flow path 200, and serve to gradually compress the fluid passing through the main flow path 200. Hereinafter, the plurality of compressors 100a, 100b and 100c will be referred to as a first compressor 100a, a second compressor 100b and a third compressor 100c from the upstream side of the main flow path 200, respectively.

Referring to FIG. 4, each of the first to third compressors 100a, 100b and 100c is connected to a pinion gear 940 and 960 geared to the bull gear 900. That is, when the bull gear 900 is rotated by a driving source 920 such as a motor or an engine, the first to third compressors 100a, 100b, and 100c operate together.

The main flow meter 250 is for measuring the flow rate of the fluid flowing in the main flow path 200, the bypass flow path (300a, 300b) in the upper side of the inlet of the first compressor (100a, 100b, 100c) and the main flow path 200 And 300c upstream of the confluence point.

Bypass flow paths 300a, 300b, and 300c are connected to the first to third compressors 100a, 100b, and 100c, respectively. The bypass flow paths 300a, 300b, and 300c bypass the compressors 100a, 100b, and 100c to connect the outlets and the inlets of the compressors 100a, 100b, and 100c.

Each bypass flow path 300a, 300b, 300c includes valves 400a, 400b, 400c capable of controlling the flow rate of each bypass flow path 300a, 300b, 300c, and each bypass flow path 300a, 300b, 300c. Bypass flowmeters 600a, 600b, and 600c capable of measuring the flow rate of?) Are disposed. Each bypass flowmeter (600a, 600b, 600c) is installed in the straight section (320a, 320b, 320c) provided in each bypass flow path (300a, 300b, 300c) for accurate flow rate measurement.

At the inlets of each of the compressors 100a, 100b, and 100c, first pressure gauges 700a, 700b, and 700c for measuring the pressure of the fluid flowing into the compressors 100a, 100b, and 100c are disposed. The second pressure gauges 800a, 800b, and 800c for measuring the pressure of the fluid flowing out of the compressors 100a, 100b, and 100c are disposed at the outlet of the 100c.

The controller (not shown) receives measurement values of each of the first pressure gauges 700a, 700b, and 700c and the second pressure gauges 800a, 800b, and 800c, and controls the opening and closing of each valve 400a, 400b, or 400c. Do it. The controller controls the pressure difference between the inlets and outlets of the compressors 100a, 100b, and 100c to stall the compressors 100a, 100b, and 100c to prevent stalls from occurring in the compressors 100a, 100b, and 100c. When the pressure difference approaches, the valves 400a, 400b and 400c of the bypass flow paths 300a, 300b and 300c may be opened to allow fluid to flow through the bypass flow paths 300a, 300b and 300c.

Thus, according to the multistage compression apparatus 4 of this embodiment, stalling of each compressor 100a, 100b, 100c can be controlled effectively.

In addition, by using the multistage compression device 4 of the present embodiment, the flow rate of the fluid passing through each of the compressors 100a, 100b, 100c can be measured without installing a flow meter at each inlet of the compressors 100a, 100b, 100c. However, hereinafter, a method of measuring the flow rate passing through each of the compressors 100a, 100b, and 100c in the multistage compression apparatus 4 of the present embodiment will be described.

FIG. 5 is a simplified diagram of the multistage compression apparatus 4 of the present embodiment in order to explain a method of calculating the flow rate passing through the compressors 100a, 100b, 100c in the multistage compression apparatus 4 of the present embodiment.

Referring to FIG. 5, the fluid flowing into the main flow path 200 flows out through the first to third compressors 100a, 100b, and 100c, and a part of the flow rate flowing out of each of the compressors 100a, 100b, and 100c is Through the bypass flow path (300a, 300b, 300c) it is re-introduced to the compressor (100a, 100b, 100c).

Accordingly, the flow rate passing through the first compressor 100 is equal to the sum of the flow rate introduced into the main flow path 200 and the flow rate of the bypass flow path 300a connected to the first compressor 100a. The flow rate passing through is equal to the sum of the flow rate flowing into the main flow path 200 and the flow rate of the bypass flow path 300b connected to the second compressor 100b, and the flow rate passing through the third compressor 100c is the main flow path ( It is equal to the sum of the flow rate introduced into the 200 and the flow rate of the bypass flow path (300c) connected to the third compressor (100c).

That is, the flow rate passing through the first to third compressors (100a, 100b, 100c), the flow rate measured by the main flowmeter 250 and the flow rate measured by each bypass flowmeter (600a, 600b, 600c) is represented by Satisfies.

fc1 = fm + fb1

fc2 = fm + fb2

fc3 = fm + fb3

Here, fc1, fc2, and fc3 are flow rates passing through the first to third compressors 100a, 100b, and 100c, respectively, fm is a flow rate measured by the main flowmeter 250, and fb1, fb2, and fb3 are respectively the first flow rates. This is the flow rate measured by the bypass flowmeters 600a, 600b, 600c disposed in the bypass flow paths 300a, 300b, 300c corresponding to the third compressors 100a, 100b, 100c.

Thus, the multistage compression apparatus 4 according to the present embodiment can measure the flow rate passing through each compressor 100a, 100b, 100c without installing a flowmeter on the inlet side of each compressor 100a, 100b, 100c. . Therefore, since it is not necessary to secure a straight section in front of the inlet of each compressor 100, it is possible to effectively reduce the length of the pipe connecting each compressor (100a, 100b, 100c) and effectively reduce the volume of the entire multi-stage compressor (4) Can be reduced.

In addition, since only one main flowmeter 250 may be installed in the main flow passage 200, the pressure loss due to the installation of the flow meters 60a, 60b, and 60c may be effectively reduced as compared to the conventional multistage compression device 4. .

Although some embodiments of the present invention have been described above, the present invention is not limited thereto and may be embodied in various forms within the scope of the technical idea of the present invention.

For example, the multi-stage compression apparatus 4 according to the above-described embodiment has been described that each compressor 100 is powered by the bull gear 900 and the pinion gears 940 and 960, but the multi-stage compression apparatus according to the present invention. (4) may be embodied in a form in which a plurality of compressors 100 are connected to and operate on one shaft.

In addition, in the above-described embodiment, the main flowmeter 250 is described as being disposed upstream of the first compressor 100, but the main flowmeter 250 is installed on the downstream side of the third compressor 100 to supply the main flow passage 200. Can also be measured. In addition, the main flowmeter 250 may be installed in the main flow path 200 between each bypass flow path (300a, 300b, 300c).

In addition, the multi-stage compression apparatus 4 of the above-described embodiment has been described as having a main flowmeter 250, but when the flow rate of the main flow path 200 is predetermined, the main flowmeter 250 may not necessarily be required.

In addition, the multi-stage compression apparatus 4 of the above-described embodiment has been described as having three compressors 100a, 100b, and 100c, but the number of compressors of the multi-stage compression apparatus 4 of the present invention is not limited thereto.

 In addition, the present invention may be embodied in various forms.

3 ... compression unit with anti-surge logic
4 ... multistage compression unit
100,100a, 100b, 100c ... compressor
200 .. euros a week
300,300a, 300b, 300c ... Bypass Euro
400,400a, 400b, 400c ... valves
600,600a, 600b, 600c ... flow meter
700,700a, 700b, 700c ... first flow meter
800,800a, 800b, 800c ... second flow meter

Claims (7)

With compressor,
A main flow passage passing through the compressor,
A bypass flow passage bypassing the compressor and connecting an inlet of the compressor and an outlet of the compressor;
A valve controlling opening and closing of the bypass flow path,
Compression unit having anti-surge logic having a flow meter disposed in the bypass flow path. The method of claim 1,
A first pressure gauge disposed at the inlet of the compressor;
Compression unit having an anti-surge logic further comprising a second pressure gauge disposed at the outlet of the compressor. A plurality of compressors connected in series and multiple stages,
A main flow passage passing through the plurality of compressors,
A plurality of bypass flow paths corresponding to the respective compressors and connecting the inlets of the respective compressors to the outlets of the compressors to bypass the compressors;
A plurality of valves disposed in each of the bypass flow passages and controlling opening and closing of each of the bypass flow passages;
And a plurality of bypass flowmeters disposed in each of the bypass flow paths. The method of claim 3,
And a main flow meter disposed in the main flow path so as to measure a flow rate flowing into the main flow path. The method of claim 4, wherein
The main flow meter,
A multistage compression system arranged in an upstream side of the compressor located at the top of the plurality of compressors in the main flow path. The method of claim 3,
A plurality of first pressure gauges disposed at the inlets of the respective compressors;
And a plurality of second pressure gauges disposed at the outlets of the respective compressors. The method of claim 3,
With fire gear,
Further comprising a plurality of pinion gear is geared to the bull gear,
Each compressor,
Multistage compression system coupled to and driven by each pinion gear.

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