Advanced system for realizing self-stabilization and self-control of reciprocating compressor loop

Abstract

The utility model discloses an advanced system for realizing self-stabilization and self-control of a loop of a reciprocating compressor, which is used for solving the problems that when an existing reciprocating compressor breaks down, personnel cannot open a valve manually in time; in addition, when most production devices operate normally, loads fluctuate up and down, and the opening degree of a valve needs to be adjusted frequently so as to stabilize the pressure of the system, and the automatic control method belongs to the technical field of reciprocating compressor automatic control. The reciprocating compressor is provided with a return pipeline and a final-stage loop pipeline, the return pipeline is provided with a return regulating valve, the final-stage loop pipeline is provided with a final-stage loop regulating valve, the reciprocating compressor is provided with a first-stage outlet pressure measuring point, the return regulating valve and the first-stage outlet pressure measuring point of the reciprocating compressor are provided with a first loop automatic controller, and the first loop automatic controller is provided with a second loop automatic controller. The loop automatic controller I controls the opening and closing of the one-return one-regulating valve The reciprocating compressor is provided with a final-stage outlet pressure measuring point, the final-stage loop regulating valve and the final-stage outlet pressure measuring point of the reciprocating compressor are provided with a loop automatic controller II, and the loop automatic controller II controls opening and closing of the final-stage loop regulating valve.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the automatic control technical field of reciprocating compressor, especially relates to an advanced system for realizing self-stabilization and self-control of reciprocating compressor loop. BACKGROUND

[0002] Reciprocating compressor is widely used in petroleum, chemical industry, natural gas transportation and other industries, and is high energy consumption equipment of enterprises. Due to the volumetric compression principle, reciprocating compressor has problems such as fixed compression flow and mismatch with system changing gas demand, causing actual large number of units to rely on backflow valve for flow regulation. In actual operation process, frequent manual operation is needed, and operation errors are prone to occur, causing system fluctuation; when current and rear sections appear abnormal, compressor outlet overpressure or inlet suction is often caused due to personnel untimely reaction, and safety accidents are prone to be caused. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing an advanced system for realizing self-stabilization and self-control of reciprocating compressor loop, and aims at solving the problems that current reciprocating compressor loop valves are manually controlled, personnel do not manually open the valve in time when equipment fails, buffer tank pressure is prone to be caused, safety valve is prone to jump or equipment overpressure rupture accident is prone to be caused; in addition, load of most production devices fluctuates up and down when normally operating, valve opening degree needs to be frequently adjusted to stabilize system pressure, and the utility model aims at reducing operation frequency and realizing self-stabilization and self-control.

[0004] The utility model is realized by adopting the following technical scheme:

[0005] An advanced system for realizing self-stabilization and self-control of reciprocating compressor loop, comprising a reciprocating compressor, the reciprocating compressor is provided with a return one pipeline and a last stage loop pipeline, the return one pipeline is provided with a return one regulating valve, the last stage loop pipeline is provided with a last stage loop regulating valve, the reciprocating compressor is provided with a first stage outlet pressure measuring point, the return one regulating valve and the first stage outlet pressure measuring point of the reciprocating compressor are provided with loop self-control one, and the loop self-control one controls opening and closing of the return one regulating valve.

[0006] The reciprocating compressor is provided with a last stage outlet pressure measuring point, the last stage loop regulating valve and the last stage outlet pressure measuring point of the reciprocating compressor are provided with loop self-control two, and the loop self-control two controls opening and closing of the last stage loop regulating valve.

[0007] When applied, the reciprocating compressor is provided with a first stage outlet pressure measuring point and a last stage outlet pressure measuring point, and is simultaneously provided with loop self-control one and loop self-control two, the loop self-control one controls opening degree of the return one regulating valve according to the first stage outlet pressure measuring point value, the loop self-control two controls opening degree of the last stage loop regulating valve according to the last stage pressure measuring point value, automatic control of the return one regulating valve and the last stage loop regulating valve is realized, and then self-stabilization and self-control of the reciprocating compressor loop are realized, and stable operation of the reciprocating compressor is maintained.

[0008] Further preferably, when the primary outlet pressure measuring point value is lower than the set value, the circuit automatic control one controls the primary circuit regulating valve to close, so as to maintain the primary outlet pressure stable.

[0009] Further preferably, when the final stage outlet pressure measuring point value is higher than the set value, the circuit automatic control two controls the final stage circuit regulating valve to open, so as to prevent the reciprocating compressor system from overpressure; when the final stage outlet pressure measuring point is lower than the set value, the circuit automatic control two controls the final stage circuit regulating valve to close.

[0010] Further preferably, the reciprocating compressor is provided with a total inlet pressure measuring point, when the total inlet pressure measuring point value is lower than the set value, the reciprocating compressor inlet is prevented from being sucked; when the total inlet pressure is higher than the set value, the circuit automatic control two controls the final stage circuit regulating valve to close.

[0011] Further preferably, when the final stage outlet pressure measuring point value is lower than the set value and the total inlet pressure measuring point value is lower than the set value, the circuit automatic control two controls the final stage circuit regulating valve to open, that is, the final stage circuit regulating valve opening degree is selected to be large, so as to stabilize the reciprocating compressor system operation.

[0012] Further preferably, the reciprocating compressor comprises an inlet total buffer tank, the inlet total buffer tank is connected with a primary inlet buffer tank through a pipeline, a total inlet pressure measuring point is arranged between the inlet total buffer tank and the primary inlet buffer tank, the primary inlet buffer tank is connected with a primary cylinder through a pipeline, the primary cylinder is connected with a primary outlet buffer tank through a pipeline, the primary outlet buffer tank is connected with a primary outlet cooler through a pipeline, a primary outlet pressure measuring point is arranged between the primary outlet buffer tank and the primary outlet cooler, the primary outlet cooler is connected with a primary outlet separator through a pipeline, the primary outlet separator is connected with a final stage inlet buffer tank through a pipeline, one end of a primary return pipeline is arranged between the primary outlet separator and the final stage inlet buffer tank, the other end of the primary return pipeline is arranged at the inlet side of the primary inlet buffer tank, the final stage inlet buffer tank is connected with a final stage cylinder through a pipeline, the final stage cylinder is connected with a final stage outlet buffer tank through a pipeline, the final stage outlet buffer tank is connected with a final stage outlet cooler through a pipeline, a final stage outlet pressure measuring point is arranged between the final stage outlet buffer tank and the final stage outlet cooler, the final stage outlet cooler is connected with a final stage outlet separator through a pipeline, the final stage outlet separator is connected with a post-process section through a pipeline, one end of a final stage circuit pipeline is arranged between the final stage outlet separator and the post-process section, the other end of the final stage circuit pipeline is arranged at the inlet side of the primary inlet buffer tank.

[0013] Compared with the process facility of the prior art which adopts manual control to adjust the loop valve, the process facility of the present application uses the pressure value of each outlet to control the opening degree of the loop valve, can realize automatic adjustment of the loop valve, and thus stabilizes the system pressure; when the equipment appears overpressure due to fault, the loop valve can be automatically opened according to the pressure, which can effectively prevent the overpressure of the buffer tank from causing the safety valve to jump or the equipment to rupture due to overpressure; when the current system pressure suddenly decreases, the last-stage loop valve can be automatically opened according to the inlet pressure, which can prevent the inlet from being sucked and cause the equipment to rupture. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings incorporated in the specification and forming a part thereof illustrate embodiments consistent with the present application and together with the description are used to explain the principles of the application.

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative effort on the premise of not paying creative effort.

[0016] Figure 1 The present application structure schematic diagram is shown.

[0017] In the drawing: 1 - total buffer tank, 2 - total inlet pressure measuring point, 3 - first-stage inlet buffer tank, 4 - first-stage cylinder, 5 - first-stage outlet buffer tank, 6 - first-stage outlet pressure measuring point, 7 - first-stage outlet cooler, 8 - first-stage outlet separator, 9 - last-stage inlet buffer tank, 10 - last-stage cylinder, 11 - last-stage outlet buffer tank, 12 - last-stage outlet pressure measuring point, 13 - last-stage outlet cooler, 14 - last-stage outlet separator, 15 - one-loop regulating valve, 16 - last-stage loop regulating valve. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative effort on the premise of not paying creative effort.

[0019] In the description, it needs to be explained that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; Obviously, the examples in the description are only a part of the examples of the present application, not all examples.

[0021] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0022] An advanced system for realizing self-stabilization and self-control of a reciprocating compressor circuit, comprising a reciprocating compressor, the reciprocating compressor being provided with a primary return pipeline and a final stage return pipeline, the primary return pipeline being provided with a primary return regulating valve 15, the final stage return pipeline being provided with a final stage return regulating valve 16, the reciprocating compressor being provided with a primary stage outlet pressure measuring point 6, the primary return regulating valve 15 and the primary stage outlet pressure measuring point 6 of the reciprocating compressor being provided with a circuit self-control I, the circuit self-control I controlling the opening and closing of the primary return regulating valve 15.

[0023] The reciprocating compressor is provided with a final stage outlet pressure measuring point 12, and the final stage return regulating valve 16 and the final stage outlet pressure measuring point 12 of the reciprocating compressor are provided with a circuit self-control II, and the circuit self-control II controls the opening and closing of the final stage return regulating valve 16.

[0024] When the value of the primary stage outlet pressure measuring point 6 is lower than the set value, the circuit self-control I controls the primary return regulating valve 15 to close small.

[0025] When the value of the final stage outlet pressure measuring point 12 is higher than the set value, the circuit self-control II controls the final stage return regulating valve 16 to open large, and when the value of the final stage outlet pressure measuring point 12 is lower than the set value, the circuit self-control II controls the final stage return regulating valve 16 to close small.

[0026] The reciprocating compressor is provided with a total inlet pressure measuring point 2, and when the value of the total inlet pressure measuring point 2 is lower than the set value, the circuit self-control II controls the final stage return regulating valve 16 to open large, and when the total inlet pressure is higher than the set value, the circuit self-control II controls the final stage return regulating valve 16 to close small.

[0027] When the value of the final stage outlet pressure measuring point 12 is less than the set value and the value of the total inlet pressure measuring point 2 is less than the set value, the loop automatic control two controls the final stage loop regulating valve 16 to open wider.

[0028] The reciprocating compressor includes an inlet main buffer tank 1, which is connected to a primary inlet buffer tank 3 via a pipeline. A main inlet pressure measuring point 2 is installed between the main inlet buffer tank 1 and the primary inlet buffer tank 3. The primary inlet buffer tank 3 is connected to a primary cylinder 4 via a pipeline. The primary cylinder 4 is connected to a primary outlet buffer tank 5 via a pipeline. The primary outlet buffer tank 5 is connected to a primary outlet cooler 7 via a pipeline. A primary outlet pressure measuring point 6 is installed between the primary outlet buffer tank 5 and the primary outlet cooler 7. The primary outlet cooler 7 is connected to a primary outlet separator 8 via a pipeline. The primary outlet separator 8 is connected to a final stage inlet buffer tank 9 via a pipeline. A pressure measuring point 6 is installed between the primary outlet separator 8 and the final stage inlet buffer tank 9. One end of a return pipeline is set at the inlet side of the first-stage inlet buffer tank 3. The last-stage inlet buffer pipe is connected to the last-stage cylinder 10 through a pipeline. The last-stage cylinder 10 is connected to the last-stage outlet buffer tank 11 through a pipeline. The last-stage outlet buffer tank 11 is connected to the last-stage outlet cooler 13 through a pipeline. A last-stage outlet pressure measuring point 12 is set between the last-stage outlet buffer tank 11 and the last-stage outlet cooler 13. The last-stage outlet cooler 13 is connected to the last-stage outlet separator 14 through a pipeline. The last-stage outlet separator 14 is connected to the downstream section through a pipeline. One end of the last-stage loop pipeline is set between the last-stage outlet separator 14 and the downstream section. The other end of the last-stage loop pipeline is set at the inlet side of the first-stage inlet buffer tank 3.

[0029] The working principle is as follows:

[0030] The total inlet pressure measuring point of this utility model is set before the first-stage inlet buffer tank 3, and the interstage outlet pressure measuring point and the final stage outlet pressure measuring point 12 are selected on the buffer tank (representing the total outlet pressure detection after the compressor has worked).

[0031] When this embodiment is applied, as follows: Figure 1 As shown, the gas enters the first-stage inlet buffer tank 3 after passing through the inlet buffer tank 1 of the reciprocating compressor. After being compressed by the first-stage cylinder 4, it enters the first-stage outlet buffer tank 5. After being cooled to room temperature by the first-stage outlet cooler 7, the gas enters the first-stage outlet separator 8. After separation, the gas enters the final-stage inlet buffer tank 9. After being compressed by the final-stage cylinder 10, it enters the final-stage outlet buffer tank 11. After being cooled to room temperature by the final-stage cooler, the gas enters the final-stage outlet separator 14. After separation, the gas is sent to the next processing section.

[0032] The primary outlet separator 8 is connected to a primary return pipeline in front of the primary inlet buffer tank 3, and a primary return valve 15 is arranged on the primary return pipeline, and the primary return valve 15 is arranged in a PID loop self-control mode with the primary outlet pressure measuring point 6, and the set value is the designed compression ratio of the reciprocating compressor, and when the value of the primary outlet pressure measuring point 6 is lower than the set value, the primary return valve 15 is closed to maintain the stability of the primary outlet pressure measuring point 6;

[0033] The last-stage outlet separator 14 is connected to a last-stage return pipeline in front of the primary inlet buffer tank 3, and a last-stage return valve 16 is arranged on the last-stage return pipeline, and the last-stage return valve 16 is arranged in a PID loop self-control mode with the total inlet pressure measuring point 2 of the reciprocating compressor, and the set value is the total inlet pressure value of the reciprocating compressor in the normal operation, and when the inlet pressure measuring point is lower than the set value, the last-stage return valve 16 is opened to maintain the stability of the inlet pressure measuring point;

[0034] The last-stage return valve 16 is arranged in a PID loop self-control mode with the last-stage outlet pressure measuring point 12, and the set value is the pressure of the rear device in the normal operation, and when the last-stage outlet pressure measuring point 12 is lower than the set value, the last-stage return valve 16 is closed to maintain the stability of the last-stage outlet pressure measuring point 12;

[0035] The PID loop self-control of the last-stage return valve 16, the total inlet pressure measuring point 2 of the reciprocating compressor and the last-stage outlet pressure measuring point 12 is set to be high, that is, the opening degree of the last-stage return valve 16 is selected to be the point with high PID loop self-control feedback value, so as to ensure the safe and stable operation of the reciprocating compressor.

[0036] The utility model has the following advantages:

[0037] 1) Automation instead of manual control, which can realize unattended stable operation, reduce labor intensity and support the next step of systematic intelligent manufacturing;

[0038] 2) Safety is effectively guaranteed, first, when the total inlet pressure is low, the last-stage return valve is opened to supplement the inlet pressure, when the inlet pressure is high, the primary return valve is closed, when the outlet pressure is low, the rear system is controlled, and when the outlet pressure is high, the last-stage return valve is opened.

[0039] The above description is only a specific implementation of the utility model, so that those skilled in the art can understand or implement the utility model. Although the foregoing embodiments are described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should be covered in the protection scope of the claims.

Claims

1. An advanced system for achieving self-stabilization and self-control of a reciprocating compressor circuit, characterized by: The reciprocating compressor is provided with a one-return-one pipeline and a last-stage return pipeline, the one-return-one pipeline is provided with a one-return-one regulating valve (15), the last-stage return pipeline is provided with a last-stage return regulating valve (16), the reciprocating compressor is provided with a one-stage outlet pressure measuring point (6), the one-return-one regulating valve (15) and the one-stage outlet pressure measuring point (6) of the reciprocating compressor are provided with a loop automatic control one, the loop automatic control one controls the opening and closing of the one-return-one regulating valve (15). The reciprocating compressor is provided with a last-stage outlet pressure measuring point (12), the last-stage return regulating valve (16) and the last-stage outlet pressure measuring point (12) of the reciprocating compressor are provided with a loop automatic control two, the loop automatic control two controls the opening and closing of the last-stage return regulating valve (16).

2. An advanced system for implementing self-stabilization and self-control of a reciprocating compressor circuit according to claim 1, characterized in that: When the one-stage outlet pressure measuring point (6) is lower than the set value, the loop automatic control one controls the one-return-one regulating valve (15) to be closed.

3. An advanced system for implementing self-stabilization and self-control of a reciprocating compressor circuit according to claim 1, characterized in that: When the last-stage outlet pressure measuring point (12) is higher than the set value, the loop automatic control two controls the last-stage return regulating valve (16) to be opened, when the last-stage outlet pressure measuring point (12) is lower than the set value, the loop automatic control two controls the last-stage return regulating valve (16) to be closed.

4. An advanced system for implementing self-stabilization and self-control of a reciprocating compressor circuit according to claim 3, characterized in that: The reciprocating compressor is provided with a total inlet pressure measuring point (2), when the total inlet pressure measuring point (2) is lower than the set value, the loop automatic control two controls the last-stage return regulating valve (16) to be opened, when the total inlet pressure is higher than the set value, the loop automatic control two controls the last-stage return regulating valve (16) to be closed.

5. An advanced system for implementing self-stabilization and self-control of a reciprocating compressor circuit according to claim 4, characterized in that: When the last-stage outlet pressure measuring point (12) is lower than the set value and the total inlet pressure measuring point (2) is lower than the set value, the loop automatic control two controls the last-stage return regulating valve (16) to be opened.

6. An advanced system for implementing self-stabilization and self-control of a reciprocating compressor circuit according to claim 4, characterized in that: The reciprocating compressor comprises an inlet total buffer tank (1), a first-stage inlet buffer tank (3) connected to the inlet total buffer tank (1) through a pipeline, a total inlet pressure measuring point (2) arranged between the inlet total buffer tank (1) and the first-stage inlet buffer tank (3), a first-stage cylinder (4) connected to the first-stage inlet buffer tank (3) through a pipeline, a first-stage outlet buffer tank (5) connected to the first-stage cylinder (4) through a pipeline, a first-stage outlet cooler (7) connected to the first-stage outlet buffer tank (5) through a pipeline, a first-stage outlet pressure measuring point (6) arranged between the first-stage outlet buffer tank (5) and the first-stage outlet cooler (7), a first-stage outlet separator (8) connected to the first-stage outlet cooler (7) through a pipeline, a last-stage inlet buffer tank (9) connected to the first-stage outlet separator (8) through a pipeline, one end of a first-stage return pipeline arranged between the first-stage outlet separator (8) and the last-stage inlet buffer tank (9), the other end of the first-stage return pipeline arranged at the inlet side of the first-stage inlet buffer tank (3), a last-stage cylinder (10) connected to the last-stage inlet buffer tank (9) through a pipeline, a last-stage outlet buffer tank (11) connected to the last-stage cylinder (10) through a pipeline, a last-stage outlet cooler (13) connected to the last-stage outlet buffer tank (11) through a pipeline, a last-stage outlet pressure measuring point (12) arranged between the last-stage outlet buffer tank (11) and the last-stage outlet cooler (13), a last-stage outlet separator (14) connected to the last-stage outlet cooler (13) through a pipeline, a post-process connected to the last-stage outlet separator (14) through a pipeline, and one end of a last-stage return pipeline arranged between the last-stage outlet separator (14) and the post-process, the other end of the last-stage return pipeline arranged at the inlet side of the first-stage inlet buffer tank (3).

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