Compressor working condition control method taking gas turbine as power source

Abstract

The invention relates to a working condition control method for a compressor with a gas turbine as a power source, and relates to the technical field of power machinery. The method comprises the steps that a target compressor outlet flow given value and a current flow value are obtained; determining a power turbine rotating speed given value based on the compressor outlet flow given value; determining a core engine rotating speed given value based on the power turbine rotating speed given value; a feeding value is determined based on the core engine rotating speed given value; and based on the feeding value, the working condition of the compressor is controlled and adjusted. The compressor unit is directly controlled according to the flow conveying target, the requirement for operators is lowered, the response to the target is faster and more timely, and meanwhile, compared with an old control method that the rotating speed of a power turbine is directly set manually, the flow control cascade structure has the advantages that the unit changes more gently, and the accuracy, the stability and the safety are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of power machinery, and in particular to a method for controlling the operating condition of a compressor using a combustion engine as a power source. Background Art

[0002] With the widespread use of natural gas as a clean energy in daily life, the demand for its transportation and storage is also increasing. As the main boosting equipment for the natural gas transportation pipeline network, the gas turbine-driven natural gas compressor has a huge market space.

[0003] In the related art, the existing natural gas boosting equipment uses the compressor speed as the ultimate control target, which is not directly related to the demand target of the natural gas boosting station itself, that is, the flow rate of transported natural gas. The on-duty personnel are required to manually set the speed target value according to the operating conditions.

[0004] However, since the natural gas flow transported by the compressor speed control is related to the anti-surge control of the compressor itself, it is difficult to find a suitable speed target value at one time. As a multi-input system, in order to obtain a certain output flow, it is necessary to manually adjust the engine speed and the anti-surge valve opening. For safety considerations during manual adjustment, the anti-surge valve opening usually has a large margin, which causes waste. Summary of the invention

[0005] The present invention relates to a method for controlling the working condition of a compressor using a gas engine as a power source, which can realize efficient and stable automatic control of the working condition of the compressor. The method comprises: Obtain the target compressor outlet flow set value and current flow value; determining a power turbine speed setpoint based on a compressor outlet flow setpoint; Determining a core engine speed setpoint based on a power turbine speed setpoint; Determine the feed value based on the core engine speed given value; Based on the feed value, the compressor operating conditions are controlled and adjusted.

[0006] In an optional embodiment, determining a power turbine speed set value based on a compressor outlet flow set value includes: The compressor outlet flow set value is input into the flow control model, and the power turbine speed set value is output.

[0007] In an optional embodiment, after determining the power turbine speed set value based on the compressor outlet flow set value, the method includes: A power turbine speed setpoint limit condition corresponding to the power turbine speed setpoint is generated.

[0008] In an optional embodiment, determining the core engine speed set value based on the power turbine speed set value includes: The power turbine speed set value is input into the turbine speed control model, and the core engine speed set value is output.

[0009] In an optional embodiment, after determining the core engine speed set value based on the power turbine speed set value, the method further comprises: A core engine speed set value constraint condition corresponding to the core engine speed set value is generated.

[0010] In an optional embodiment, determining the feed value based on the core engine speed given value includes: The core engine speed given value is input into the feed value calculation model, and the feed value is output.

[0011] In an optional embodiment, the method further comprises: Determine the compressor speed based on the compressor flow set value; Determine the anti-surge valve opening set value based on the compressor speed; The anti-surge valve control current value is determined based on the anti-surge valve opening given value.

[0012] In an optional embodiment, determining the compressor speed based on the compressor flow set value includes: Configure working line data corresponding to the target compressor; The compressor speed is determined by combining the working line data and the compressor flow set value.

[0013] In an optional embodiment, determining the anti-surge valve control current value based on the anti-surge valve opening given value includes: The given value of the anti-surge valve opening is input into the current calculation model, and the anti-surge valve control current value is output.

[0014] The beneficial effects brought about by the technical solution provided by the present invention include at least: Directly controlling the compressor unit according to the flow delivery target reduces the requirements for operators and responds to the target more quickly and timely. At the same time, compared with the old control method of manually setting the power turbine speed, the flow control cascade structure has smoother unit changes and higher accuracy, stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1A flow chart of a method for controlling a compressor operating condition using a gas engine as a power source provided by an exemplary embodiment of the present invention is shown.

[0017] Figure 2 A flow chart of another compressor operating condition control method using a combustion engine as a power source provided by an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Figure 1 A flow chart of a compressor operating condition control method using a gas engine as a power source provided by an exemplary embodiment of the present invention is shown. The method is described by taking the application of the method in a computer device as an example. The method comprises: Step 101, obtaining a target compressor outlet flow set value and a current flow value.

[0020] In the embodiment of the present invention, the target compressor outlet flow set value is the preset value of the outlet flow of the target compressor during the adjustment process. The current flow value represents the current flow state of the target compressor. It should be noted that the target compressor is a compressor with a fuel engine as a power source, so the adjustment of the working condition is associated with the fuel engine feed value of the compressor.

[0021] Step 102: determining a power turbine speed set value based on a compressor outlet flow set value.

[0022] In the embodiment of the present invention, a cascade structure control is adopted inside the compressor, and the speed of the compressor includes the speed of the power turbine and the speed of the core engine. Therefore, the given value of the speed of the power turbine and the given value of the speed of the core engine are determined step by step.

[0023] Step 103, determining a core engine speed set value based on a power turbine speed set value.

[0024] Step 104, determining the feed value based on the core engine speed given value.

[0025] This process is a process of determining the final fuel supply value based on the core engine speed given value. In the embodiment of the present invention, the fuel supply value is the fuel supply value.

[0026] Step 105: Based on the feed value, the compressor operating condition is controlled and adjusted.

[0027] In an embodiment of the present invention, the compressor operating condition at least includes the actual flow rate of the compressor. In some other embodiments of the present invention, the compressor operating condition also includes compression to at least one of a power turbine speed value and a core engine speed value.

[0028] In summary, the method provided in the embodiment of the present invention directly controls the compressor unit according to the flow delivery target, which reduces the requirements for operators and responds to the target more quickly and timely. At the same time, compared with the old control method of manually directly setting the power turbine speed, the flow control cascade structure has a smoother unit change and higher accuracy, stability and safety.

[0029] It should be noted that, in the embodiment of the present invention, in order to prevent the surge phenomenon from occurring, in the conventional cascade control process, it is also possible to set Figure 2 A flow chart of another compressor operating condition control method using a gas engine as a power source provided by an exemplary embodiment of the present invention is shown. The method is described by taking the application of the method in a computer device as an example. The method includes: Step 201, obtaining a target compressor outlet flow set value and a current flow value.

[0030] This process corresponds to the process shown in step 101 and will not be described in detail here.

[0031] Step 202, input the compressor outlet flow set value into the flow control model, and output the power turbine speed set value.

[0032] In an embodiment of the present invention, the flow control model is implemented as a calculation model, which corresponds to an input quantity including a given value of the compressor outlet flow. After determining the input quantity, the computer device can output a given value of the power turbine speed.

[0033] In an embodiment of the present invention, a specific method for determining the power turbine speed set value is: the power turbine speed set value is calculated based on a given flow rate and flow rate feedback through a PID controller closed-loop control.

[0034] Step 203, generating a power turbine speed set value restriction condition corresponding to the power turbine speed set value.

[0035] In the embodiment of the present invention, the power turbine speed set value restriction condition is used to be input into the controller to directly control the working state of the power turbine, thereby achieving the adjustment of the power turbine speed.

[0036] Step 204, input the power turbine speed set value into the turbine speed control model, and output the core engine speed set value.

[0037] In an embodiment of the present invention, a specific method of the core engine speed set value is: the core engine speed set value is calculated based on the power turbine speed set value and the power turbine speed measurement value through the closed-loop control of the PID controller.

[0038] Step 205: Generate a core engine speed set value restriction condition corresponding to the core engine speed set value.

[0039] Step 206, input the core engine speed given value into the feed value calculation model, and output the feed value.

[0040] In the embodiment of the present invention, a specific method for determining the feed value is: the feed value is calculated based on the core engine speed set value and the core engine speed measurement value through the closed-loop control of the PID controller.

[0041] Step 207, determining the compressor speed based on the compressor flow set value.

[0042] In the embodiment of the present invention, the compressor speed is usually determined by configuring the working line data corresponding to the target compressor and combining the working line data and the compressor flow set value. Optionally, a specific method for determining the compressor speed is: Step 208: Determine the anti-surge valve opening set value based on the compressor speed.

[0043] In the embodiment of the present invention, the anti-surge valve opening given value is determined based on the working line of the target compressor. Optionally, a specific calculation method of the anti-surge valve opening given value is: the anti-surge valve opening given value is calculated by interpolation of the target compressor characteristic curve according to the target compressor and the boost ratio.

[0044] Step 209, determining the anti-surge valve control current value based on the anti-surge valve opening given value.

[0045] In the embodiment of the present invention, the process is a process of inputting the anti-surge valve opening given value into the current calculation model and outputting the anti-surge valve control current value. Optionally, an example of a specific calculation process of the anti-surge valve control current value is: the anti-surge valve control current value is calculated by a PID controller closed-loop control based on the anti-surge valve opening given value and the anti-surge valve opening measured value.

[0046] That is, steps 207 to 209 show a method for determining the anti-surge valve control current value in parallel with the cascade control method and using the compressor flow set value as input.

[0047] In summary, the method provided by the embodiment of the present invention: 1) The compressor unit is directly controlled according to the flow delivery target, which reduces the requirements for operators and responds to the target more quickly and timely.

[0048] 2) Compared with the old control method of manually setting the power turbine speed directly, the flow control cascade structure has smoother unit changes and higher accuracy, stability and safety.

[0049] 3) Decoupled anti-surge control can also adopt fully automated control during the unit adjustment process, eliminating the redundant safety margin during manual control and reducing the unit energy consumption.

[0050] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling the operating condition of a compressor using a gas engine as a power source, characterized in that: The method is applied in a computer device, and the method comprises: Obtain the target compressor outlet flow set value and current flow value; Determining a power turbine speed set value based on the compressor outlet flow set value; Determining a core engine speed setpoint based on the power turbine speed setpoint; Determining a feed value based on a given value of the core engine speed; Based on the feed value, the compressor operating condition is controlled and adjusted.

2. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 1, characterized in that: The step of determining a power turbine speed set value based on the compressor outlet flow set value comprises: The compressor outlet flow set value is input into a flow control model, and the power turbine speed set value is output.

3. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 2, characterized in that: After determining the power turbine speed set value based on the compressor outlet flow set value, the method includes: A power turbine speed set value restriction condition corresponding to the power turbine speed set value is generated.

4. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 1, characterized in that: The determining of the core engine speed set value based on the power turbine speed set value comprises: The power turbine speed set value is input into a turbine speed control model, and the core engine speed set value is output.

5. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 4, characterized in that: After determining the core engine speed set value based on the power turbine speed set value, the method further comprises: A core engine speed set value restriction condition corresponding to the core engine speed set value is generated.

6. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 1, characterized in that: The step of determining the feed value based on the core engine speed given value comprises: The core engine speed given value is input into a feed value calculation model, and the feed value is outputted.

7. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 6, characterized in that: The method further comprises: Determining a compressor speed based on the compressor flow set value; Determining a given value of the anti-surge valve opening based on the compressor speed; The anti-surge valve control current value is determined based on the anti-surge valve opening given value.

8. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 7, characterized in that: The step of determining the compressor speed based on the compressor flow set value comprises: Configure working line data corresponding to the target compressor; The compressor speed is determined by combining the working line data and the compressor flow set value.

9. The method for controlling the operating condition of a compressor using a gas engine as a power source according to claim 7, characterized in that: The step of determining the anti-surge valve control current value based on the anti-surge valve opening given value comprises: The anti-surge valve opening given value is input into the current calculation model, and the anti-surge valve control current value is output.

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