A gas concentration control method and system for a gas generator set

Abstract

The application discloses a kind of gas concentration control method and system of gas generator set, it is related to the technical field of gas control of generator set, the corresponding relationship of actual power and intake pressure, intake temperature and intake pressure are obtained in advance, the method specifically includes: obtaining gas generator set intake pressure, automatically adjusting gas concentration range according to the change of intake pressure, and correcting gas concentration range by intake temperature;Actual power is obtained according to the difference range of the calculated power and intake pressure and correction parameter;Protective measures are determined by the difference range of the calculated power and actual power.The application can improve the adaptability of low-gas generator set to low-gas fluctuation, improve power generation efficiency;Without the flow measurement accuracy of gas flow valve, directly modify concentration or adjust air and gas valve, avoid the problem that low-gas change is too large, adaptive adjustment range is insufficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas control of generator sets, and particularly relates to a gas concentration control method and system for a gas generator set. BACKGROUND

[0002] Low-gas and partial-gas are usually utilized by means of gas power generation, but the composition of gas often changes, and the current engine usually adjusts the ratio of gas and air by means of manual, exhaust temperature, cylinder temperature and the like, and the reaction speed is slow, and the unit cannot be adjusted in time.

[0003] In the prior art, the LCEM system has a GQCL control mode, in which the control system compares the actual power of the engine with the calculated power of the engine of the system, corrects the gas flow, and makes the actual power of the engine equal to the calculated power. The inventor finds that the GQCL control mode is not suitable for low-gas sources with large changes in gas, and the normal adaptation range of the gas control system is about 20%, and the accuracy of the gas valve flow measurement is relatively high. When the gas valve is blocked, the power closed loop will be offset, and the power closed loop needs to be recalibrated to continue to be used, and because of the adjustment range, gas valve blockage and the like, the use in a low-gas field is not ideal. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application aims to provide a gas concentration control method and system for a gas generator set, which can improve the adaptability of a low-gas generator set to low-gas fluctuations and improve the power generation efficiency, does not require the accuracy of gas flow valve flow measurement, directly corrects the concentration or adjusts the air and gas valve, and avoids the problems of large changes in low-gas and insufficient adaptive adjustment range.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0006] In a first aspect, the embodiments of the present application provide a gas concentration control method for a gas generator set, and the corresponding relationship between actual power and intake pressure, the corresponding relationship between intake temperature and intake pressure are obtained in advance, and the method specifically comprises:

[0007] The intake pressure of the gas generator set is obtained, the gas concentration range is automatically adjusted according to the change of the intake pressure, and the gas concentration range is corrected by the intake temperature;

[0008] The calculated power is obtained according to the intake pressure and the correction parameter;

[0009] The difference range between the calculated power and the actual power is used to determine the protection measures.

[0010] As a further implementation manner, the correction parameter comprises a temperature correction value, a concentration correction value, an exhaust temperature correction value and a manual correction value.

[0011] As a further implementation manner, the calculated pressure is obtained according to a ratio of the intake pressure and the product of the temperature correction value, the concentration correction value, the exhaust temperature correction value and the manual correction value, and the calculated power is obtained according to a relationship between the calculated pressure and the high power and the low power corresponding pressure.

[0012] As a further implementation manner, the relationship between the intake temperature and the intake pressure is calculated according to the Clapeyron equation.

[0013] As a further implementation manner, the highest exhaust temperature value and the lowest exhaust temperature value are determined according to the operating state of the gas generator set, and the exhaust temperature correction value is determined according to an exhaust temperature range formed by the lowest exhaust temperature value and the highest exhaust temperature value.

[0014] As a further implementation manner, the protection measure comprises an exhaust temperature load reduction, a parking, a gas fluctuation load reduction and an exhaust temperature difference load reduction.

[0015] As a further implementation manner, when the difference between the calculated power and the actual power exceeds a set range, the exhaust temperature load reduction mode is adopted.

[0016] In a second aspect, embodiments of the present application further provide a gas concentration control system of a gas generator set, comprising:

[0017] A gas concentration range correction module is configured to obtain an intake pressure of the gas generator set, automatically adjust a gas concentration range according to a change of the intake pressure, and correct the gas concentration range by an intake temperature;

[0018] A calculated power obtaining module is configured to obtain a calculated power according to the intake pressure and a correction parameter;

[0019] A protection measure determining module is configured to determine a protection measure according to a difference range between the calculated power and an actual power.

[0020] In a third aspect, embodiments of the present application further provide a computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of the gas concentration control method of the gas generator set.

[0021] In a fourth aspect, embodiments of the present application further provide a computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the gas concentration control method of the gas generator set when executing the program.

[0022] The present application has the following advantages:

[0023] The present application utilizes the characteristics of the pressure in the intake cavity of the external mixing single-point injection gas unit, relies on the change of the pressure in the intake cavity to automatically adjust the gas concentration of the unit, and slowly corrects the range of the control through the temperature, solves the self-adaptive problem of the gas ratio in the market of the low-gas generator unit with large gas source fluctuation, eliminates a series of problems caused by the large workload of manual adjustment or the slow adjustment response speed of the cylinder temperature and exhaust temperature, improves the adaptability of the low-gas generator unit to low-gas fluctuation, and improves the power generation efficiency.

[0024] The gas generator unit of the present application is provided with protection measures of exhaust temperature load reduction, parking, gas fluctuation load reduction and exhaust temperature difference load reduction, so that the unit automatically adapts to the change of the gas concentration by combining the gas concentration adjustment and the protection measures, improves the unit efficiency, improves the unit emission, and reduces the unit failure rate.

[0025] The present application overcomes the shortcomings of the GQCL control mode, does not require the flow measurement accuracy of the gas flow valve, directly modifies the concentration or adjusts the air and gas valves, and introduces a manual correction value, thereby avoiding the problems of large low-gas change and insufficient adaptive adjustment range. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof serve to explain the present application and do not constitute an improper limitation on the present application.

[0027] Figure 1 is a flow chart of the present application according to one or more embodiments;

[0028] Figure 2 is a graph of the actual power corresponding to the intake pressure of the present application according to one or more embodiments;

[0029] Figure 3 is a schematic diagram of the control interface of the present application according to one or more embodiments. DETAILED DESCRIPTION

[0030] Embodiment one:

[0031] The present embodiment provides a gas concentration control method for a gas generator unit, and the actual power corresponding to the intake pressure and the intake temperature corresponding to the intake pressure are obtained in advance, as shown in Figure 1 The method specifically comprises the following steps:

[0032] The intake pressure of the gas generator unit is obtained, the gas concentration range is automatically adjusted according to the change of the intake pressure, and the gas concentration range is corrected through the intake temperature;

[0033] The calculation power is obtained according to the intake pressure and the correction parameter;

[0034] The protection measure is determined by calculating the difference range between the power and the actual power.

[0035] The embodiment utilizes the characteristics of the pressure in the intake cavity of the external mixing single-point injection gas unit, relies on the change of the pressure in the intake cavity to automatically adjust the gas concentration of the unit, and slowly corrects the range of the control through the temperature.

[0036] In the embodiment, the correction parameters include a temperature correction value, a concentration correction value, an exhaust temperature correction value, and a manual correction value.

[0037] According to the good running state of the gas generator unit, the intake pressure of the unit is recorded, for example, as shown in Table 1. Figure 2 Taking a 1000GF9-WD low-gas unit as an example, when the power is 950 KW and the intake temperature is 30°C, the intake pressure range of the unit is 2 bar to 2.06 bar. After obtaining the pressure range of multiple power points, the corresponding relationship between the actual power and the intake pressure is calculated.

[0038] 1. Temperature correction value:

[0039] When the intake temperature changes, the relationship between the intake temperature and the intake pressure is calculated according to the Clapeyron equation PV = nRT to obtain the temperature correction value. The specific method is that the correction value is 1 at 20 degrees Celsius, and the formula is: temperature correction value = (273 + intake temperature) / 293.

[0040] 2. Concentration correction value:

[0041] According to the actual running situation on site, the relationship between the gas concentration and the intake pressure is designed. The specific method is that when the CH4 concentration is greater than 15%, the concentration correction value is equal to the default value 1, and when the concentration is less than or equal to 15%, the formula is:

[0042] Concentration correction value = 1 - (15 - gas concentration) / 500

[0043] The concentration correction value changes.

[0044] 3. Exhaust temperature correction value:

[0045] According to the highest exhaust temperature and the lowest exhaust temperature when the unit is running well, the exhaust temperature range is obtained; when the exhaust temperature exceeds the above range, it is slowly corrected to obtain the exhaust temperature correction value.

[0046] The specific method is that when the average exhaust temperature is between the highest exhaust temperature and the lowest exhaust temperature, the correction value is normally defaulted to 1, when the average exhaust temperature is higher than the upper limit of the set value, the exhaust temperature correction value slowly increases by 0.01 every 30 seconds, and when the average exhaust temperature is lower than the lower limit of the set value, the exhaust temperature correction value slowly decreases by 0.01 every 30 seconds.

[0047] 4. Manual correction value:

[0048] In order to adapt to the change of field gas source, a manual correction value manually inputted in the field is introduced.

[0049] 5. Finally, the following is obtained:

[0050] Actual value of intake pressure control = manual correction value * temperature correction value * concentration correction value * exhaust temperature correction value * pressure set value.

[0051] The protection measures of the embodiment include exhaust temperature reduction, parking, gas fluctuation reduction and exhaust temperature difference reduction.

[0052] In order to prevent the gas generator set from changing the pressure state due to the fact that some cylinders do not work, a mode of reducing load to 320KW is set when the exhaust temperature difference of each cylinder is greater than 150 degrees; in order to prevent the measurement error of the sensor or the adjustment speed from not following the change speed of the concentration, a mode of reducing load to 400KW is set when any cylinder exhaust temperature is higher than 670 degrees, and the set continues to be higher than 690 degrees, and the generator set is parked; in order to prevent the measurement from being affected by the serious instability of the generator set, a mode of reducing load to 320KW is set when the power fluctuation exceeds the limit value of 300KW.

[0053] In order to more directly protect the gas generator set, the power of the generator set is calculated, and when the difference between the calculated power and the actual power is too large, the generator set is slowly reduced.

[0054] In the formula, the calculated pressure = intake pressure / (manual correction value * concentration correction value * temperature correction value * exhaust temperature correction value);

[0055] Calculated power = high power-(high power-low power)*(high power corresponding pressure-calculated pressure) / (high power corresponding pressure-low power corresponding pressure).

[0056] In the embodiment, the intake temperature and the intake pressure are used to automatically adjust the size of the gas concentration, so that the generator set always works at the set pressure under the corresponding power, thereby making the running state of the generator set stable and optimal.

[0057] As shown in Figure 3 The embodiment sets the exhaust temperature reduction, parking, gas fluctuation reduction and exhaust temperature difference reduction mode, in order to prevent sudden changes from being adjusted, after the generator set is closed, the power of the generator set is calculated, and when the difference between the calculated power and the actual power reaches a certain value (for example, 150KW), the concentration is adjusted and the load is slowly reduced.

[0058] In the embodiment, the adjustment and protection measures are combined, so that the generator set automatically adapts to the change of the gas concentration, improves the efficiency of the generator set, improves the emission of the generator set, and reduces the failure rate of the generator set.

[0059] Embodiment two:

[0060] The embodiment provides a gas concentration control system of a gas generator set, comprising:

[0061] A gas concentration range correction module is used for acquiring gas inlet pressure of the gas generator set, automatically adjusting the gas concentration range according to the change of the gas inlet pressure, and correcting the gas concentration range through the gas inlet temperature;

[0062] A calculated power acquisition module is used for obtaining the calculated power according to the gas inlet pressure and the correction parameter;

[0063] A protection measure determination module is used for determining the protection measure through the difference range of the calculated power and the actual power.

[0064] Embodiment three:

[0065] The embodiment provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the steps in the gas concentration control method of the gas generator set.

[0066] Embodiment four:

[0067] The embodiment provides a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the processor realizes the steps in the gas concentration control method of the gas generator set when executing the program.

[0068] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of controlling the concentration of fuel gas for a gas-powered generator set, characterized by, The method specifically comprises the following steps: The gas concentration range is automatically adjusted according to the change of the intake pressure, and the gas concentration range is corrected through the intake temperature; the correction parameters include a temperature correction value, a concentration correction value, an exhaust temperature correction value and a manual correction value; According to the intake pressure and the correction parameter, the calculated power is obtained; specifically, the calculated pressure is obtained according to the ratio of the product of the intake pressure, the temperature correction value, the concentration correction value, the exhaust temperature correction value and the manual correction value, and the calculated power is obtained according to the relationship between the calculated pressure and the high-power corresponding pressure and the low-power corresponding pressure; the calculated power is obtained according to the relationship between the calculated pressure and the high-power corresponding pressure and the low-power corresponding pressure, specifically: calculated power = high power - (high power - low power) (high-power corresponding pressure - calculated pressure) / (high-power corresponding pressure - low-power corresponding pressure) The protection measures are determined by calculating the difference range between the calculated power and the actual power; The protection measures include exhaust temperature load reduction, parking, gas fluctuation load reduction and exhaust temperature difference load reduction; When the difference between the calculated power and the actual power exceeds a set range, the exhaust temperature load reduction mode is adopted; in order to prevent sudden change adjustment, after the unit is closed, the unit power is calculated, and when the difference between the calculated power and the actual power reaches a certain value, the concentration is adjusted and the load is slowly reduced.

2. The gas concentration control method for a gas-powered packaged generator according to claim 1, characterized by, The relationship between the intake temperature and the intake pressure is calculated according to the Clapeyron equation.

3. The method of claim 1, wherein the gas concentration is controlled by adjusting the amount of fuel supplied to the gas engine. The exhaust temperature maximum value and the exhaust temperature minimum value are determined according to the running state of the gas power generation unit, and the exhaust temperature correction value is determined according to the exhaust temperature range formed by the exhaust temperature minimum value and the exhaust temperature maximum value.

4. A gas concentration control system for a gas-powered generator set, comprising: The method comprises the following steps: A gas concentration range correction module is configured to acquire the intake pressure of the gas power generation unit, automatically adjust the gas concentration range according to the change of the intake pressure, and correct the gas concentration range through the intake temperature; the correction parameters include a temperature correction value, a concentration correction value, an exhaust temperature correction value and a manual correction value; The computing power acquisition module is used for obtaining the computing power according to the intake pressure and the correction parameter; specifically, the computing pressure is obtained according to the ratio of the product of the intake pressure, the temperature correction value, the concentration correction value, the exhaust temperature correction value and the manual correction value, and the computing power is obtained according to the relationship between the computing pressure and the high-power corresponding pressure and the low-power corresponding pressure; the computing power is obtained according to the relationship between the computing pressure and the high-power corresponding pressure and the low-power corresponding pressure, specifically: computing power = high power - (high power - low power) (high power corresponding pressure - computing pressure) / (high power corresponding pressure - low power corresponding pressure) A protection measure determination module is configured to determine the protection measures by calculating the difference range between the calculated power and the actual power; the protection measures include exhaust temperature load reduction, parking, gas fluctuation load reduction and exhaust temperature difference load reduction; When the difference between the calculated power and the actual power exceeds a set range, the exhaust temperature load reduction mode is adopted; in order to prevent sudden change adjustment, after the unit is closed, the unit power is calculated, and when the difference between the calculated power and the actual power reaches a certain value, the concentration is adjusted and the load is slowly reduced.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to realize the steps in the gas concentration control method of the gas power generation unit as claimed in any one of claims 1-3.

6. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the steps in the gas concentration control method of the gas power generation unit as claimed in any one of claims 1-3.

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