A gas parameter adjusting system and method applied to a gas engine

Abstract

The application discloses a gas parameter adjusting system and method applied to a gas engine, adopts a potentiometer control signal generator to simulate a gas concentration signal, can omit computer connection and one-by-one inputting time, and can greatly compress adjusting time. Only by slightly twisting the potentiometer, the gas concentration parameter adjusting is realized, and the method is very simple and convenient. The adjusting speed is greatly improved, and even multiple units can be simultaneously operated.

Description

A gas parameter adjustment system and method for gas engines Technical Field

[0001] This invention belongs to the technical field of gas engine, and particularly relates to a gas parameter adjustment system and method for gas engines. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] The stable operation of a gas turbine engine requires the composition of the gas to be within a reasonable range. If the composition of the gas changes significantly, exceeding the engine's own composition parameter correction range, the gas turbine engine will be unable to operate stably, directly leading to unit shutdown or knocking and other dangers, causing significant losses.

[0004] When significant changes occur in the composition of fuel gas, the traditional method involves manually adjusting the parameters of the fuel gas composition by connecting a computer to the engine's control system, entering the software login account and password. This is extremely slow and inefficient, taking an average of about 5 minutes per engine. For large-scale power generation projects such as biogas power generation, coal gas power generation, coke oven gas power generation, carbon monoxide power generation, and hydrogen power generation, manually adjusting parameters one by one is not only slow but also prone to causing unit disconnection and shutdown. The workload for on-duty personnel is enormous, and they may become overwhelmed and even make mistakes in the rush, leading to other hazards.

[0005] For example, a landfill in Guangdong uses six 1000KW biogas generator sets in an islanded operation to supply power to a factory. Such a large-scale use of biogas generator sets in an islanded mode to provide comprehensive power supply for a factory is very rare in the industry.

[0006] This presents numerous technical challenges. For instance, sudden increases and decreases in load during islanded operation can severely impact the unit, demanding extremely high dynamic response capabilities. Landfill gas concentrations frequently fluctuate due to factors such as temperature, fermentation time, humidity, leaks, and drainage. This landfill utilizes under-membrane biogas extraction technology; the large landfill area and high probability of leaks further increase the probability and magnitude of methane concentration variations. For example, during commissioning, the worst instance occurred where the gas concentration fluctuated repeatedly between 50% and 36% within 10 minutes. These methane concentration changes directly affect unit stability; even slight mishaps can lead to unit shutdown and power supply disruptions. Therefore, rapid adjustments to the unit's gas parameters are crucial to prevent shutdowns. Consequently, improving the speed of adjusting gas parameters in the engine control system and enhancing the unit's dynamic response have become key factors for the smooth operation of the power plant.

[0007] Previously, adjusting the gas parameters of the engine controller involved connecting a computer to the controller, entering a username and password, accessing the program, finding the gas parameters, consulting the gas concentration table, determining the gas concentration value, deciding whether to increase or decrease the concentration, finding the new gas parameters in the concentration table, typing them in character by character, and saving the changes. The effect had to be observed, and if the effect was not significant, further adjustments had to be made. This process was repeated for each unit. The steps were cumbersome, and sometimes communication was slow due to high-voltage interference. Adjusting the parameters of six units could take at least 5-6 minutes. Excessive debugging time could easily cause unit shutdowns and power outages. Therefore, reducing the time for adjusting gas engine parameters from minutes to seconds to ensure smooth unit operation and stable and safe power supply is a pressing issue that needs to be addressed. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention provides a gas parameter adjustment system and method for gas engines, which uses a potentiometer to control a signal generator to simulate the concentration signal of the gas, thus eliminating the time required for computer connection and inputting numbers one by one, and significantly reducing the adjustment time.

[0009] To achieve the above objectives, a first aspect of the present invention provides a gas parameter adjustment system for a gas engine, comprising: a gas engine controller, a potentiometer, and a signal generator;

[0010] The input terminal of the signal generator is connected to the output terminal of the potentiometer. The signal generator receives the analog signal output by the potentiometer and uses the received analog signal to control the change of the gas parameters of the engine controller.

[0011] A second aspect of the present invention provides a method for adjusting gas parameters in a gas engine, employing the aforementioned gas parameter adjustment system for a gas engine, characterized in that the resistance of the potentiometer is adjusted based on the actuator opening degree, and / or exhaust temperature change, and / or unit sound and / or power and speed fluctuations.

[0012] The above one or more technical solutions have the following beneficial effects:

[0013] In this invention, a potentiometer-controlled signal generator is used to simulate the concentration signal of the gas, eliminating the need for computer connection and sequential digital input, thus significantly reducing adjustment time. Adjusting the gas concentration parameter is as simple as turning the potentiometer, making it extremely convenient. The adjustment speed is greatly improved, and multiple units can even operate simultaneously.

[0014] In this invention, parameters such as changes in actuator opening degree, exhaust temperature, power and speed fluctuations, generator sound, and current gas parameter display values ​​are used as judgment criteria to quickly adjust the parameters of the gas composition in the engine, thereby stabilizing the engine rapidly. Then, fine-tuning is performed using parameters such as actuator opening degree and exhaust temperature as judgment criteria, or the controller's own program is used for fine-tuning to restore it to the optimal operating conditions.

[0015] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 is a schematic diagram of the box body in Embodiment 1 of the present invention;

[0018] Figure 2 is a wiring diagram of the signal generator and the gas engine controller in Embodiment 1 of the present invention;

[0019] Figure 3 is a schematic diagram of the potentiometer in Embodiment 1 of the present invention. Detailed Implementation

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0022] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0023] Example 1

[0024] This embodiment discloses a gas parameter adjustment system for a gas engine, including: a gas engine controller, a potentiometer, and a signal generator;

[0025] The input terminal of the signal generator is connected to the output terminal of the potentiometer. The signal generator receives the analog signal output by the potentiometer and uses the received analog signal to control the change of the gas parameters of the engine controller.

[0026] In this embodiment, the signal generator can receive the analog signal from the potentiometer and send the gas parameter signal required by the engine controller (governor). The engine controller (governor) receives the signal from the signal generator and changes the engine's gas parameters.

[0027] As shown in Figure 2, RB, RA, and GND are the analog input ports of the signal generator, mAo and GND are the 4-20mA analog signal output terminals, and mAi and GND are the 0-20mA input terminals of the speed controller. Specifically, the analog input port of the signal generator is connected to the GND terminal of the speed controller, the mAo terminal of the signal generator is connected to the mAi terminal of the speed controller, and the PWR terminal of the signal generator is connected to the PWR terminal of the speed controller.

[0028] As shown in Figure 3, the WXD3-13-2W potentiometer is a 10KΩ coil resistor. The rotating shaft drives a slider to slide along the resistance wire, controlling the resistance change at the output terminal and providing a resistance analog signal to the signal generator. The signal generator outputs a 4-20mA signal based on the given value, thus setting the biogas concentration. The potentiometer has three terminals: terminals 1 and 3 are fixed at 10KΩ, and terminal 2 is the potentiometer's slider, which is also the output terminal. Forward or reverse resistance variations are obtained by connecting terminals 2 and 1, or 2 and 3.

[0029] As shown in Figure 1, the cabinet adopts a single-unit design (single-unit does not mean that only one set of controllers can be installed, but includes multiple sets). It is connected by screws in a parallel cabinet manner, which is convenient for parallel and unparalleled, and is conducive to increasing or decreasing the number of units, making it very flexible in use. It can be fixed on the wall or placed on the table. There is a cable inlet hole at the back and bottom. When fixed on the wall, use the bottom cable inlet hole, and when placed on the table, use the rear cable inlet hole.

[0030] In this embodiment, the signal generator parameters are set to put the signal generator in potentiometer mode. The controller is wired and its parameters are set to put the controller in the CH4 signal-on state. The signal range that the controller can receive is set to match that of the signal generator.

[0031] This example illustrates the parameter settings for a biogas power generation signal generator and gas engine controller at a landfill. Please note that these settings are for illustrative purposes only and may vary depending on the specific engine controller.

[0032] Digital display analog output module settings:

[0033] (1) F0-2 Given type selection: 3-(potential set);

[0034] (2) F0-3 Output Type Selection: 3-(0~100% corresponds to 4~20Ma);

[0035] (3) F0-6 displays the minimum value: 300;

[0036] (4) F0-7 displays the maximum value: 700;

[0037] (5) 1.2 - Gas Attribute Settings:

[0038] Parameter settings for a certain type of engine controller:

[0039] ① Select (Activate CH4% signal)

[0040] ② Gas parameters (low quality)

[0041] CH4%-30;Density-1.6kg / m3;Low heating value (LHV)-10.76MJ / m3;

[0042] Theoretical air-fuel ratio: -2.901 Nm3 gas / Nm3 air;

[0043] ③ Gas parameters (high quality)

[0044] CH4%-70; Density-1.1kg / m3; Lower heating value (LHV)-25.12MJ / m3;

[0045] Theoretical air-fuel ratio: -6.77 Nm3_gas / Nm3_air;

[0046] (2) 10.3-Input (CH4 sensor / UEGO-NGK):

[0047] Turn the potentiometer counterclockwise to the end and clockwise to the end, then fill in the original CH4% voltage values ​​obtained twice into the voltage column. Their corresponding CH4% values ​​are 30.00 and 70.00, respectively.

[0048] In order to address the issue of unstable engine operation caused by significant changes in gas composition exceeding the engine's stable range, this embodiment uses parameters such as actuator opening, exhaust temperature, power fluctuations, and generator noise as judgment criteria to quickly adjust the gas composition parameters of the engine, thereby stabilizing the engine rapidly. Then, fine-tuning is performed using parameters such as actuator opening and exhaust temperature as judgment criteria, or by relying on the controller's own program to fine-tune the process and restore the engine to its optimal operating conditions.

[0049] This rapid gas parameter adjustment method uses a potentiometer to control a 4-20mA signal generator to simulate gas concentration signals. This eliminates the time spent connecting to a computer and manually inputting numbers, significantly reducing adjustment time. The signal generator directly displays the gas concentration, making it easy to determine the current gas concentration range and engine parameters. There's no need for tedious table lookups or computer logins; a computer can even be completely eliminated. Simply turning the potentiometer adjusts the gas concentration parameters—it's incredibly simple and convenient. The adjustment speed is greatly improved, allowing even simultaneous operation of multiple units. For example, adjusting the gas parameters of six units, which previously took five minutes, now only takes 2-3 seconds. This significantly faster adjustment speed compared to traditional techniques means a substantial improvement in the unit's responsiveness, preventing frequent shutdowns caused by frequent changes in gas concentration and greatly reducing the workload of operators.

[0050] The gas concentration parameter adjustment system enables rapid adjustment of gas parameters, preventing frequent unit shutdowns caused by frequent changes in gas concentration. This significantly reduces the workload of operating personnel and avoids chaotic situations during critical moments.

[0051] This embodiment addresses the issue of unstable engine operation caused by significant changes in fuel gas composition exceeding the engine's stable range. It utilizes parameters such as actuator opening changes, exhaust temperature changes, power and speed fluctuations, generator sound, and current fuel gas parameter displays as criteria to rapidly adjust the fuel gas composition parameters, stabilizing the engine quickly. Fine-tuning is then performed using actuator opening and exhaust temperature parameters, or by relying on the controller's own program to restore optimal operating conditions.

[0052] Example 2

[0053] The purpose of this embodiment is to provide a method for adjusting gas parameters in a gas engine. It adopts a gas parameter adjustment system for a gas engine as described in Embodiment 1. The system is characterized in that the resistance of the potentiometer is adjusted based on the actuator opening degree, and / or exhaust temperature change, and / or unit sound and / or power and speed fluctuations.

[0054] This solution addresses situations where significant changes in fuel gas composition exceed the engine's stable operating range, leading to unstable engine operation. It uses parameters such as changes in actuator opening, exhaust temperature, power and speed fluctuations, generator sound, and current fuel gas parameter display values ​​as judgment criteria to quickly adjust the fuel gas composition parameters, stabilizing the engine rapidly. Fine-tuning is then performed using actuator opening and exhaust temperature parameters, or by relying on the controller's own program for fine-tuning, to restore the engine to optimal operating conditions.

[0055] In this embodiment, a method for adjusting gas parameters in a gas engine is shown in the table below:

[0056] Table 1:

[0057]

[0058]

[0059] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any particular combination of hardware and software.

[0060] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for adjusting gas parameters in a gas engine, characterized in that, A gas parameter adjustment system for a gas engine is employed. This system includes a gas engine governor, a potentiometer, and a signal generator. The input of the signal generator is connected to the output of the potentiometer. The potentiometer controls the signal generator to simulate a gas concentration signal, eliminating the time required for computer connection and sequential digital input, thus significantly reducing adjustment time. The signal generator receives the analog signal output from the potentiometer and outputs the gas parameter signal needed by the engine governor. The engine governor receives the signal from the signal generator and changes the engine's gas parameters. The gas parameter adjustment method includes... Fluctuations in exhaust temperature, turbocharger surge, exhaust pipe backfire, power, and speed are used as the basis for judgment. The resistance of the potentiometer is adjusted by turning it. If the exhaust temperature is lower than normal, the gas parameters are adjusted within 5% to stabilize the unit. If turbocharger surge or power and speed fluctuations are greater than ±3%, the gas parameters are first adjusted by more than 5% to stabilize the unit speed, and then fine-tuned to bring the unit to the optimal operating state. If the exhaust temperature is higher than normal, the gas parameters are adjusted within 5% to stabilize the unit. If exhaust pipe backfires, the gas parameters are first adjusted by more than 5% to stabilize the unit speed, and then fine-tuned to bring the unit to the optimal operating state.

2. The method for adjusting gas parameters in a gas engine as described in claim 1, characterized in that the signal generator is used to output a 4-20mA signal to control the change of gas parameters in the engine governor.

3. The method for adjusting gas parameters in a gas engine as described in claim 1, characterized in that, It also includes a housing, and the potentiometer and the signal generator are housed inside the housing.

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