A natural gas fuel gas calorific value regulating system, method and device

Abstract

The present invention relates to the technical field of gas calorific value, and specifically to a natural gas gas calorific value regulation system, method and device. The present invention realizes one-step calculation of natural gas calorific value regulation by real-time monitoring of state parameters in the natural gas pipeline transportation process. At the same time, the pressure and temperature in the transmission process are fully considered to correct the calculation of the natural gas calorific value regulation process, so as to ensure that the natural gas calorific value regulation is fast and accurate. In addition, the present invention provides dynamic regulation of the gas calorific value. When the working conditions change, the system of the present invention can also automatically adjust to the target calorific value state, so as to realize the stability of the calorific value of the natural gas pipeline transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of gas calorific value, and in particular to a natural gas calorific value regulating system, method and device. Background Art

[0002] At present, with the increase in natural gas consumption and the expansion of its scope of use, its transmission pipeline network will achieve regional, national and even global interconnection. However, due to the diversification of natural gas resources, natural gases with different calorific values ​​entering the same pipeline network are prone to interchangeability problems. At the same time, some special users have specific requirements for the calorific value of natural gas. For example, some industrial users need high calorific value natural gas to meet the needs of their production processes, while some civilian users may pay more attention to the economy and environmental protection of natural gas. Therefore, it is necessary to achieve effective regulation of the calorific value of natural gas.

[0003] For example, the patent with authorization announcement number CN216643263U discloses an adjustable system for gas, in which a fixing plate is moved upward, thereby moving a fixing column upward and disengaging the fixing column from the vent hole. However, there are still certain shortcomings.

[0004] There is rigid friction between the fixed column and the vent hole. After long-term use, a gap will form between the two, and natural gas can flow through the gap, causing the actual flow rate to differ from the required flow rate, which will have a certain impact on subsequent use results or recorded data.

[0005] For example, Chinese patent CN116027822A discloses a natural gas control system, which receives the calorific value data of the pipeline back end and compares it with the preset calorific value, and uses proportional / integral and differential calculations to adjust the natural gas flow and oxygen flow according to the size and direction of the deviation, so that the natural gas burns fully. However, in actual applications, the use of proportional regulation has static errors and low control accuracy. Integral regulation is prone to oscillation and overshoot. If the time constant of differential regulation is too large, it will introduce interference and large system impact. If it is too small, the adjustment cycle will be long and the effect will not be significant. In addition, proportional, integral and differential regulation are dynamic adjustment processes, and the flow valve needs to be frequently operated. On the one hand, the flow valve and other equipment are easily damaged due to frequent operation. On the other hand, the adjustment process is unstable and the calorific value adjustment takes a long time to complete. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a natural gas calorific value regulation system, method and device, which can achieve fast and accurate regulation of the natural gas calorific value.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A natural gas calorific value regulating device comprises a data collector, a data processor and a gas mixing actuator, wherein the data collector comprises at least a temperature collector, a gas pressure collector in a pipeline, a gas flow collector in a pipeline and a gas calorific value collector; the data processor comprises a processor and a memory, wherein the memory stores a data processing algorithm, algorithm parameters and parameters of a natural gas calorific value regulating system after dynamically regulating the calorific value; the processor executes a natural gas calorific value regulating method, completes the mixed gas flow required for gas calorific value regulation and calculates the opening degree of a pipeline electric valve;

[0009] The gas mixing actuator includes an electric valve and a control circuit, and the control circuit receives an adjustment instruction from a data processor and controls the electric valve to open to a specified opening degree;

[0010] The electric valve includes a valve body and a motor. The opening degree of the valve body is controlled by controlling the rotation of the motor through a control circuit. A mounting plate is fixedly installed in the middle of the valve body. A plurality of through holes are opened through the middle of the mounting plate. A sealing column of different lengths is slidably installed in the middle of the through hole to seal it. A lever hole is opened at the bottom of the sealing column. A sealing airbag is fixedly installed on the outside of the sealing column. The sealing airbag is connected to the lever hole.

[0011] One end of the valve body is connected to and fixedly installed with an air inlet, and the other end of the valve body is connected to and fixedly installed with an air outlet.

[0012] Preferably, a limited polygonal rod is slidably installed through the middle of the mounting plate, a linkage plate is fixedly installed on the top of the limited polygonal rod, and a plurality of sealing columns are evenly fixedly installed on the bottom of the linkage plate in circumferential direction according to their lengths; a screw rod is rotatably installed on the top of the linkage plate, the screw rod is threadedly connected to the top of the valve body, a hand wheel is fixedly installed on the top of the screw rod, one end of the hand wheel is fixedly connected to the output shaft of the motor, and the motor is slidably installed between the support column on the valve body; a positioning rod is fixedly installed on the outside of the handwheel, a fixing rod is fixedly installed on the top of the valve body, and a plurality of threaded holes are evenly opened through the middle of the fixing rod; a threaded hole is opened at the end of the positioning rod away from the handwheel, and the positioning rod and the fixing rod are fixedly connected by bolts.

[0013] The present invention also provides a regulating system for a natural gas calorific value regulating device, comprising:

[0014] Data acquisition module, the data acquisition module collects the natural gas pipeline flow Q1 and records the natural gas calorific value q1 in the pipeline, collects the high calorific value pipeline gas flow Q H And record the gas calorific value q H , collect low calorific value pipeline flow Q L And record the gas calorific value q L , collect the calorific value of the mixed output gas and record it as q;

[0015] Data processing module, which receives the target calorific value q0 of natural gas and processes the data. The processing logic is as follows:

[0016] S1. Determine the magnitude relationship between the current calorific value q of natural gas and the target calorific value q0;

[0017] S2. When q > q0, assign the adjustment variable q2 = q L , and adjust the pipe valve V to the low-calorific value pipeline valve V L ; when q < q0, assign the adjustment variable q2 = q H , and adjust the pipe valve V to the high-calorific value pipeline valve V H ;

[0018] S3. Calculate the adjusted pipeline flow rate Q2, , where α is the adjustment factor, ;

[0019] S4. Calculate the opening degree of the adjusted pipe valve V , where β is the proportionality factor between the valve opening degree and the gas flow rate;

[0020] Gas mixing module, which receives the adjusted pipe valve V and the valve opening degree from the data processing module , and adjusts the corresponding valve opening degree to , so that the gas in the corresponding pipeline is mixed with the gas in the natural gas pipeline to adjust the calorific value of the natural gas;

[0021] Furthermore, the data acquisition module also collects at least the gas pressure P1 and temperature T1 in the natural gas pipeline, the gas pressure P H and temperature T H in the high-calorific value pipeline, and the gas pressure P L and temperature T L in the low-calorific value pipeline;

[0022] Particularly, in step S2 of the data processing module, it also processes: when q > q0, assign the variables P2 = P L , T2 = T L ; when q < q0, assign the variables P2 = P H , T2 = T H ;

[0023] Particularly, in step S3 of the data processing module, the pipeline flow rate is calculated and corrected to make , where is the flow correction factor, which is a function of P1, P2, T1, T2, q1, q2, is the flow correction offset;

[0024] Particularly, in step S3 of the data processing module, the opening degree of the pipe valve is calculated Also make corrections so that ,in is the valve opening correction factor, which is a function of P2 and T2. It is the valve correction offset.

[0025] Furthermore, the natural gas calorific value regulation system further includes an abnormal alarm module, which receives the actual output calorific value q of the natural gas pipeline. out And compared with the target calorific value q0, calculate ,when When the value is greater than the preset warning threshold thresh1, the system issues a warning of abnormal heat value; the abnormal alarm module also receives and adjusts the pipeline flow Q in real time. 2_real Data, when the valve V is operated to adjust the opening degree When When the valve is abnormal, the system issues a valve abnormality warning.

[0026] Furthermore, the natural gas calorific value regulation system further includes a dynamic regulation module, which receives the actual output calorific value q of the natural gas pipeline. out And compared with the target calorific value q0, calculate , set the valve to adjust the minimum scale V min , gas calorific value stability threshold thresh3, adjust the natural gas calorific value, specifically:

[0027] when When the system is not operated, the gas calorific value is not adjusted;

[0028] when If it is not true, continue to run "Is V assigned a value?"

[0029] If the adjustment valve V is not assigned a specific valve variable, that is, "Is V assigned a value?" is not true:

[0030] when When , open the low calorific value pipeline valve and press Iterate until The curve with i reaches the extreme point, where i is the number of adjustments. When it exceeds 100%, the system issues a valve overshoot warning;

[0031] when When , high calorific value pipeline valve is opened and pressed Iterate until The curve with i reaches the extreme point, where i is the number of adjustments. When it exceeds 100%, the system issues a valve overshoot warning;

[0032] If the valve V is adjusted to assign a specific valve variable, the current valve opening degree is recorded as , calculate the adjustment direction variable , at the same time, when When defining variables ,when When the variable , adjust V to the corresponding valve and press Iterate until The curve with i reaches the extreme point, where i is the number of adjustments. When it exceeds 100% or is lower than 0, the system issues a valve overshoot warning.

[0033] Dynamic adjustment is completed, and the current parameters are recorded, including: P1, P2, T1, T2, q1, q2, Q1, Q2, V, .

[0034] Furthermore, the natural gas calorific value regulation system also includes a model iteration module. When the dynamic adjustment record parameters accumulate to a specified number, the system integrates the newly added data to the pipeline flow Q2 and valve opening degree. Make training adjustments.

[0035] In particular, the present invention also provides a natural gas calorific value regulating method, which completes data processing of the data processing module and completes dynamic adjustment of the natural gas calorific value of the dynamic adjustment module.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides a method for regulating the calorific value of natural gas, which fully considers the influence of gas flow, calorific value, temperature and pressure on calorific value regulation, realizes one-step automatic regulation of the calorific value of natural gas, and achieves the effect of fast and accurate calorific value regulation.

[0038] The present invention also provides a method for dynamic calorific value adjustment. Through dynamic adjustment, when the natural gas pipeline transportation conditions change due to special reasons, the calorific value of the gas can be automatically stabilized, and special operating condition data can be recorded at the same time, the calorific value adjustment model can be further optimized, and the characteristics of fast and accurate natural gas calorific value adjustment can be further ensured.

[0039] The present invention can monitor the parameters of the natural gas pipeline transportation process in real time and can automatically issue an alarm when an abnormal situation occurs.

[0040] Natural gas enters the sealing airbag from the leverage hole, and the sealing airbag expands to further seal the through-hole, thereby ensuring that the actual flow rate is basically consistent with the required flow rate. When adjusting, the sealing column moves up and down. Since the sealing airbag is elastic, the friction with the through-hole is small, the wear is slow, and the service life is long. When the sealing airbag and the through-hole are worn, the sealing airbag can also expand to make the two seal together to achieve precise control of the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0042] Figure 2 This is a schematic diagram of the natural gas calorific value adjustment method of the present invention;

[0043] Figure 3 This is a logic diagram of the dynamic adjustment module of the present invention;

[0044] Figure 4 This is a schematic diagram interface of the natural gas calorific value regulating device of the present invention;

[0045] Figure 5 It is a comparison curve diagram of using PID control and the adjustment method of the present invention;

[0046] Figure 6 A schematic diagram of the overall structure of a natural gas calorific value regulating device provided by the present invention;

[0047] Figure 7 A schematic diagram of the internal structure of a valve body of a natural gas calorific value regulating device provided by the present invention;

[0048] Figure 8 for Figure 7 A magnified image of point A;

[0049] Fig. 9 A schematic diagram of the sealing column structure of a natural gas calorific value regulating device provided by the present invention.

[0050] In the figure: 1. Sealing airbag; 2. Air inlet; 3. Air outlet; 4. Valve body; 5. Handwheel; 6. Screw rod; 7. Linkage plate; 8. Sealing column; 9. Limiting polygonal rod; 10. Mounting plate; 11. Through hole; 12. Positioning rod; 13. Fixing rod; 14. Threaded hole; 15. Scale bar; 16. Lever hole; 17. Motor; 18. Support column. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Embodiment 1:

[0053] like Figure 1 , 2 As shown, a natural gas calorific value regulation system of the present invention comprises a data acquisition module, a data processing module, a gas mixing module (i.e., a command execution module), an abnormal alarm module, and a dynamic regulation module, wherein the abnormal alarm module can monitor and alarm the entire system process such as the dynamic regulation process and conventional data acquisition abnormalities in addition to monitoring the gas calorific value deviation.

[0054] In actual application, when the calorific value of natural gas pipeline transportation needs to be changed (the target calorific value is q0), the system data acquisition module first collects the natural gas pipeline flow Q1 and records the calorific value of the natural gas in the pipeline q1, and collects the high calorific value pipeline gas flow Q H And record the gas calorific value q H , collect low calorific value pipeline flow Q L And record the gas calorific value q L , collect the calorific value of the mixed output gas and record it as q. Secondly, the system data processing module compares the current calorific value q with the target calorific value q0:

[0055] when When the current gas calorific value is higher than the target calorific value, the calorific value needs to be reduced. Therefore, the valve of the low calorific value pipeline needs to be opened (the value of the adjustment pipe valve V is the low calorific value pipeline valve V L , the corresponding assignment adjustment variable q2 = q L ), mixing low calorific value gas into the current natural gas to reduce the calorific value of natural gas;

[0056] when When the gas calorific value is lower than the target calorific value, the calorific value needs to be increased. Therefore, the valve of the high calorific value pipeline needs to be opened (the value of the adjustment pipe valve V is the high calorific value pipeline valve V H , the corresponding assignment adjustment variable q2 = q H ), mixing high calorific value gas into the current natural gas to increase the calorific value of natural gas.

[0057] Accordingly, increasing or decreasing the calorific value requires opening the pipeline flow rate Q2 of the mixed gas, , where q0, q1, and q2 represent the target calorific value of the natural gas, the original calorific value of the main natural gas pipeline, and the calorific value of the mixed gas (corresponding calorific values are replaced with the calorific values of the corresponding gases according to increase or decrease). In application, the three calorific values are specific values that can be determined in the previous application. When using, only need to directly input them into the system as known quantities. When the calorific values of the gases in the three pipelines cannot be obtained, this system can also add detection devices to obtain the calorific value results of the gases in the main pipeline and the mixed pipeline.

[0058] Correspondingly, the degree to which the corresponding valve of the mixed gas pipeline needs to be opened can be calculated according to the flow rate , where β is the proportionality factor between the valve opening degree and the gas flow rate.

[0059] Through the above operations, when it is necessary to control the calorific value of the transmitted natural gas to a certain calorific value q0, the data processing module of this system quickly calculates, determines the flow rate of the mixed gas, calculates the valve opening degree, and sends an instruction to the gas mixing module. The gas mixing module selects the valve to be opened according to the data processing module and controls the valve to open to the calculated opening degree, realizing one-step adjustment of the gas calorific value. At the same time, the data collected by the system will be saved in the system in real time and visually displayed on the display screen in real time. When the deviation of some parameters from the preset values is greater than a certain threshold, the abnormal warning module of the system will give an alarm, and it will also be synchronously displayed on the display screen.

[0060] Example 2:

[0061] As Figure 2 、 3 shown, on the basis of Example 1, fully considering the influence of the gas pressure and temperature in the transmission pipeline on the calorific value control and flow rate control, the adjustment formula of Example 1 is corrected to make the gas calorific value adjustment more accurate.

[0062] First, the data acquisition module at least also acquires the gas pressure P1 and temperature T1 in the natural gas pipeline, the gas pressure PH and temperature TH in the high-calorific value pipeline, and the gas pressure PL and temperature TL in the low-calorific value pipeline. When q>q0, assign the variable P2 = P L 、T2 = T L ; when q<q0, assign the variable P2 = P H 、T2 = T H , thus corresponding the increased or decreased parameters to the operating variables T2 and P2. When correcting, the data processing module first corrects the calculation of the flow rate. Considering that the main factors mapping the flow rate to the calorific value system also include the pipeline fluid pressure and temperature, a flow rate correction equation is established, , where is the flow rate correction factor, which is a function of P1, P2, T1, T2, q1, and q2. is the flow correction bias. To determine the parameters in the correction equation, two methods can be used:

[0063] 1. Default correction factor in the starting state , , , , during actual operation, this system includes an abnormal alarm module and a dynamic adjustment module. When the difference between the calorific value q and the preset calorific value q0 is large (greater than thresh1) after the flow rate calculated using the calculation formula in Embodiment 1 and the valve opening degree instruction are completed, the system issues a warning, indicating that the adjustment function does not conform to the current working condition. At this time, the operator can choose automatic dynamic adjustment. The dynamic adjustment will adjust the valve little by little according to a set adjustment scale and track the flow rate Q2 of the mixed gas and the calorific value q of the mixed gas. When the difference between the calorific value of the finally mixed gas and the preset calorific value q0 keeps decreasing and starts to increase (i.e., the extreme point of the curve of the difference and the number of times), the dynamic adjustment ends and records the relevant parameters at this time, including: P1, P2, T1, T2, q1, q2, Q1, Q2, V, , when the recorded data accumulates to a certain amount (it can be the results of multiple times of a single device or the data results of multiple devices), use this data to the pipeline flow rate and the valve opening degree out for iterative training to obtain optimized parameters. The iterative method can be to use the difference between the actual output calorific value q of the natural gas pipeline after mixing and the target calorific value q0 as the loss function and use the gradient descent method for parameter fitting, or it can be to use the polynomial fitting method and use the least squares method for parameter fitting. Among them, the valve opening correction only needs to use the target pipeline flow rate Q2, the current pipeline temperature T2, pressure P2, and the current valve opening degree

[0064] 2. Through experiments, collect the mixed calorific value q under different temperatures, pressures, flow rates, and heat amounts ( ) at the specified pipeline flow rate Q2, and perform fitting of the flow equation after obtaining a large amount of data; collect the flow rate data Q2 at different valve opening degrees under different temperatures and pressures ( ) and perform correction fitting of the valve opening degree and the flow rate.

[0065] When finally used, the natural gas calorific value q0 to be converted is input, and the data processing module automatically calculates the valve opening degree according to the corrected equation, that is, , to achieve precise control of valve opening and stable output of natural gas with specified calorific value, thereby improving user satisfaction.

[0066] It should be noted that according to the valve opening degree equation, by simplifying the parameters, the final The reason why they are separated in the present invention is that, on the one hand, the flow and opening degree equations of general valves are relatively fixed, and basically do not need to be corrected under normal pressure and temperature, so the fitting process can be simplified. On the other hand, by fitting separately, the relationship between the required flow and the actual flow can be dynamically observed. When there is a large deviation between the two, the fault of the valve can be found (it may be due to long-term use, corrosion, wear and tear causing the valve flow to be too large, or due to blockage causing the flow to be too small).

[0067] It should be further explained that there may be factors that have not been taken into account in practical applications. However, since the correction equation of the present invention adopts a fitting method rather than a data solution (analytical method), the impact of some factors that have not been taken into account will be reflected in the parameters of the correction equation, thereby avoiding the problem of incomplete consideration of influencing factors.

[0068] Embodiment three:

[0069] like Figure 4-Figure 8 As shown, the present invention provides a natural gas calorific value regulating device to achieve calorific value regulation of natural gas, wherein the data collector realizes the data collection function, and at least includes a temperature collector, a gas pressure collector in the pipeline, a gas flow collector in the pipeline, and a gas calorific value collector; the data processor completes the core calculation, achieves a one-time adjustment of the calorific value of the natural gas, and continuously optimizes and adjusts the model to achieve fast and accurate adjustment of the calorific value of the natural gas; the gas mixer actuator is an instruction execution structure, including an electric valve and a control circuit, and the control circuit receives the adjustment instruction of the data processor and controls the electric valve to open to a specified opening degree.

[0070] In practical applications, the regulating device of the present invention can also be connected to a display terminal to realize real-time visual display of data, and at the same time, with the help of data processing and data storage functions, data trend display, analysis and further data mining can be performed to discover more problems. At the same time, the display terminal can also be synchronized with the alarm device to synchronously display the warning information on the display terminal to conduct real-time monitoring of natural gas pipeline transportation. Among them, the types of warnings are mainly as follows:

[0071] 1. During the data collection phase, the threshold is designed and set. When a parameter exceeds the specified threshold, a corresponding warning is issued, such as abnormal pressure, abnormal problem, etc. This is a routine function;

[0072] 2. Actual output calorific value of natural gas pipeline q out The difference between the target calorific value q0 , when | When it is greater than the preset warning threshold thresh1, the system issues a warning of abnormal heat value;

[0073] 3. Actual receiving adjustment pipeline flow Q 2_real Data, when the valve V is operated to adjust the opening degree When When the system issues a valve abnormality warning;

[0074] 4. During the dynamic adjustment process, when the valve is adjusted to below 0% for full closure or above 100% for full opening, the system will issue a valve overshoot warning.

[0075] like Figure 5 As shown, by comparing with the traditional PID control (including proportional, integral, and differential terms) algorithm, the method of the present invention has no overshoot and no delay, and can achieve the natural gas calorific value conversion in one step.

[0076] The electric valve includes a valve body 4 and a motor 17. The rotation of the motor 17 is controlled by a control circuit to control the opening degree of the valve body 4. A mounting plate 10 is fixedly installed in the middle of the valve body 4. A plurality of through holes 11 are penetrated through the middle of the mounting plate 10 for the circulation of natural gas. A sealing column 8 of different lengths is slidably installed in the middle of the through hole 11 to seal it, which is used to adjust the number of through holes 11 through which natural gas can flow, thereby controlling the flow rate of natural gas. A lever hole 16 is opened at the bottom of the sealing column 8, and a sealing airbag 1 is fixedly installed on the outside of the sealing column 8, and the sealing airbag 1 is connected to the lever hole 16.

[0077] In this embodiment, during operation, natural gas enters the sealing airbag 1 from the lever hole 16, and the sealing airbag 1 expands to further seal with the through hole 11, thereby ensuring that the actual flow rate is basically consistent with the required flow rate. During adjustment, the sealing column 8 moves up and down. Since the sealing airbag 1 is elastic, the friction with the through hole 11 is small, the wear is slow, and the service life is long. When the sealing airbag 1 and the through hole 11 are worn, the sealing airbag 1 can also expand so that the two are sealed and matched to achieve precise control of the flow rate.

[0078] Specifically, one end of the valve body 4 is connected to and fixedly installed with the air inlet 2 , and the other end of the valve body 4 is connected to and fixedly installed with the air outlet 3 .

[0079] In this embodiment, the natural gas flow path is the gas inlet 2 , the valve body 4 , the through hole 11 , and the gas outlet 3 .

[0080] Specifically, a limiting polygonal rod 9 is slidably installed in the middle of the mounting plate 10, a linkage plate 7 is fixedly installed on the top of the limiting polygonal rod 9, the limiting polygonal rod 9 is used to limit the movement trajectory of the linkage plate 7, and a plurality of sealing columns 8 are uniformly and circumferentially fixedly installed at the bottom of the linkage plate 7 in sequence according to their lengths;

[0081] A screw rod 6 is rotatably installed on the top of the linkage plate 7. The screw rod 6 is used to move the linkage plate 7 up and down, driving the screw rod 6 to be threadedly connected to the top of the valve body 4. A hand wheel 5 is fixedly installed on the top of the screw rod 6. One end of the hand wheel 5 is fixedly connected to the output shaft of the motor 17. The motor 17 is slidably installed between a support column 18 on the valve body 4. The support column 18 is fixed on the valve body 4. A slide groove is provided on the support column 18. A connecting rod is provided in the slide groove. The connecting rod is fixedly connected to the side wall of the motor 17. In an emergency, it is convenient for the staff to rotate the screw rod 6. Under normal working conditions, the forward and reverse rotation of the motor 17 is controlled by the control circuit. The motor 17 is a forward and reverse motor. The motor is connected to an external power supply or a battery (not shown in the figure), thereby controlling the opening degree of the valve body 4.

[0082] In this embodiment, in an emergency, the staff rotates the hand wheel 5 and the screw 6 to raise or lower the screw 6, the linkage plate 7 and the sealing column 8, thereby increasing or decreasing the number of openings of the through holes 11, thereby achieving natural gas flow rate regulation.

[0083] Specifically, a positioning rod 12 is fixedly installed on the outer side of the hand wheel 5, a fixing rod 13 is fixedly installed on the top of the valve body 4, and a plurality of threaded holes 14 are evenly penetrated in the middle of the fixing rod 13;

[0084] A threaded hole 14 is formed at one end of the positioning rod 12 away from the hand wheel 5 , and the positioning rod 12 is fixedly connected to the fixing rod 13 by bolts.

[0085] In this embodiment, in an emergency, after the adjustment is completed, the positioning rod 12 rotates with the hand wheel 5 to the threaded hole 14 of the corresponding height, and the staff uses bolts to fix the positioning rod 12 and the fixing rod 13 to prevent the hand wheel 5 from rotating under the interference of the external environment, thereby ensuring that the natural gas flow rate is fixed.

[0086] Specifically, a plurality of scale bars 15 are evenly fixedly installed on the outer side of the fixing rod 13 to facilitate the staff to check the adjustment progress, and the scale bars 15 are matched with the threaded holes 14 in the middle of the fixing rod 13 one by one.

[0087] In this embodiment, the scale bar 15 can clearly display the current natural gas flow rate, making it convenient for the staff to know the adjustment progress.

[0088] Specifically, the bottom of the hand wheel 5 and the top of the valve body 4 are commonly connected with a sealing assembly, and the sealing assembly is movably installed on the periphery of the screw rod 6 to prevent natural gas from leaking from the matching gap between the screw rod 6 and the valve body 4. This article only lists one implementation method. There are many ways to solve the problem in the prior art, which are relatively mature and will not be repeated in this article.

[0089] Specific working method: The natural gas flow path is the air inlet 2, the valve body 4, the through hole 11, and the air outlet 3. When adjusting the flow rate, under normal circumstances, the rotation of the screw rod 6 is controlled by the motor 17. In an emergency, the staff can turn the handwheel 5 and the screw rod 6 to make the screw rod 6, the linkage plate 7, and the sealing column 8 rise and fall, so that the number of open through holes 11 increases or decreases, thereby realizing the natural gas flow rate adjustment. After the adjustment is completed, the positioning rod 12 follows the handwheel 5 to rotate to the threaded hole 14 of the corresponding height. The staff uses bolts to fix the positioning rod 12 and the fixing rod 13 to prevent the handwheel 5 from rotating under the interference of the external environment, thereby ensuring that the natural gas flow rate is fixed. The scale bar 15 can clearly display the current natural gas flow rate, which is convenient for the staff to know the adjustment progress.

[0090] During operation, natural gas enters the sealing airbag 1 from the lever hole 16, and the sealing airbag 1 expands and further seals with the through hole 11, thereby ensuring that the actual flow rate is basically consistent with the required flow rate. During adjustment, the sealing column 8 moves up and down. Since the sealing airbag 1 is elastic, the friction with the through hole 11 is small, the wear is slow, and the service life is long. When the sealing airbag 1 and the through hole 11 are worn, the sealing airbag 1 can also expand so that the two are sealed and matched to achieve precise control of the flow rate.

[0091] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A natural gas calorific value regulating device, comprising a data collector, a data processor and a gas mixing actuator, wherein the data collector at least comprises a temperature collector, a gas pressure collector in a pipeline, a gas flow collector in a pipeline and a gas calorific value collector; characterized in that: The data processor includes a processor and a memory, and the memory stores the data processing algorithm, algorithm parameters, and parameters after the natural gas calorific value adjustment system dynamically adjusts the calorific value; the processor executes the natural gas calorific value adjustment method, completes the mixed gas flow required for the gas calorific value adjustment, and calculates the opening degree of the pipeline electric valve; The gas mixing actuator includes an electric valve and a control circuit, and the control circuit receives an adjustment instruction from a data processor and controls the electric valve to open to a specified opening degree; The electric valve comprises a valve body (4) and a motor (17). The opening degree of the valve body (4) is controlled by the rotation of the motor (17) controlled by a control circuit. A mounting plate (10) is fixedly mounted in the middle of the valve body (4). A plurality of through holes (11) are penetrated through the middle of the mounting plate (10) for the circulation of natural gas. A sealing column (8) of different lengths is slidably mounted in the middle of the through hole (11) to seal the through hole (11). The sealing column (8) is used to adjust the number of through holes (11) through which natural gas can flow, thereby controlling the flow rate of the natural gas. A lever hole (16) is opened at the bottom of the sealing column (8). A sealing air bag (1) is fixedly mounted on the outer side of the sealing column (8). The sealing air bag (1) is connected to the lever hole (16). Natural gas enters the sealing air bag (1) from the lever hole (16). The sealing air bag (1) expands and further seals the through hole (11), thereby ensuring that the actual flow rate is consistent with the required flow rate. One end of the valve body (4) is connected to and fixedly mounted with an air inlet (2), and the other end of the valve body (4) is connected to and fixedly mounted with an air outlet (3).

2. A natural gas calorific value regulating device according to claim 1, characterized in that: A limiting polygonal rod (9) is slidably installed in the middle of the installation plate (10), a linkage plate (7) is fixedly installed on the top of the limiting polygonal rod (9), and a plurality of sealing columns (8) are evenly and circumferentially fixedly installed on the bottom of the linkage plate (7) in accordance with their lengths; A screw rod (6) is rotatably mounted on the top of the linkage plate (7), the screw rod (6) is threadedly connected to the top of the valve body (4), a hand wheel (5) is fixedly mounted on the top of the screw rod (6), one end of the hand wheel (5) is fixedly connected to the output shaft of the motor (17), and the motor (17) is slidably mounted between a support column (18) on the valve body (4).

3. A natural gas calorific value regulating device according to claim 2, characterized in that: A positioning rod (12) is fixedly installed on the outside of the hand wheel (5), a fixing rod (13) is fixedly installed on the top of the valve body (4), and a plurality of threaded holes (14) are evenly penetrated through the middle of the fixing rod (13); A threaded hole (14) is provided at one end of the positioning rod (12) away from the hand wheel (5), and the positioning rod (12) and the fixing rod (13) are fixedly connected by bolts.

4. The regulating system of the natural gas calorific value regulating device according to claim 3 is characterized in that: The system includes: Data acquisition module, the data acquisition module collects the natural gas pipeline flow Q1 and records the natural gas calorific value q1 in the pipeline, collects the high calorific value pipeline gas flow Q H And record the gas calorific value q H , collect low calorific value pipeline flow Q L And record the gas calorific value q L , collect the calorific value of the mixed output gas and record it as q; Data processing module: The data processing module receives the target calorific value of natural gas q0 and performs data processing. The processing logic is as follows: S1. Determine the relationship between the current natural gas calorific value q and the target calorific value q0; S2. When q > q0, assign the adjustment variable q2 = q L , and adjust the pipe valve V to the low calorific value pipeline valve V L ; when q < q0, assign the adjustment variable q2 = q H , and adjust the pipe valve V to the high calorific value pipeline valve V H ; S3. Calculate and adjust the pipeline flow Q2, Q2 = α·Q1, where α is the adjustment factor, α = (q1-q0) / (q0-q2); S4. Calculate the opening degree V of the regulating valve V open =β·Q2, where β is the proportional factor between valve opening and gas flow rate; Gas mixing module, the gas mixing module receives the adjustment pipe valve V and valve opening degree V from the data processing module open , adjust the corresponding valve opening to V open , so that the gas in the corresponding pipeline is mixed with the gas in the natural gas pipeline, and the calorific value of the natural gas is adjusted.

5. The regulating system of the natural gas calorific value regulating device according to claim 4 is characterized in that: The data acquisition module also collects at least the gas pressure P1 and temperature T1 in the natural gas pipeline, the gas pressure P1 in the high calorific value pipeline H and temperature T H , Gas pressure in low calorific value pipeline P L and temperature T L ; The data processing module in step S2 also processes: when q > q0, assign variables P2 = P L , T2 = T L ; when q < q0, assign variables P2 = P H , T2 = T H ; The data processing module S3 calculates the pipeline flow rate and makes corrections so that Q2 = ω Q α Q1+b Q , where ω Q =F Q (P1, P2, T1, T2, q1, q2) is the flow correction factor, which is a function of P1, P2, T1, T2, q1, q2, b Q is the flow correction bias; The data processing module S4 calculates the pipe valve opening degree V open Also make corrections so that V open =ω V β Q2+b V , where ω V =F V (P2, T2) is the valve opening correction factor, which is a function of P2 and T2. V It is the valve correction offset.

6. The regulating system of the natural gas calorific value regulating device according to claim 5, characterized in that: The natural gas calorific value regulating system further comprises an abnormal alarm module, which receives the actual output calorific value q of the natural gas pipeline. out And compare it with the target calorific value q0, calculate Δq=q out -q0, when |Δq| is greater than the preset warning threshold thresh1, the system issues a warning of abnormal calorific value; the abnormal alarm module also receives and adjusts the pipeline flow Q in real time 2_real Data, when the valve V is operated to adjust the opening degree V open When |Q 2_real -Q2|>thresh2, the system issues a valve abnormality warning.

7. The regulating system of the natural gas calorific value regulating device according to claim 6 is characterized in that: The natural gas calorific value regulation system also includes a dynamic regulation module, which receives the actual output calorific value q of the natural gas pipeline. out And compare it with the target calorific value q0, calculate Δq=q out -q0, set the minimum scale V of valve adjustment min , gas calorific value stability threshold thresh3, adjust the natural gas calorific value, specifically: When |Δq|≤thresh3, the system does not operate and the gas calorific value is not adjusted; When |Δq|>thresh3, If the adjustment valve V is not assigned a specific valve variable: When Δq>0, the value V=V L , open the low calorific value pipeline valve and press V open =i·V min Iterate until the curve of Δq and i reaches the extreme point, where i is the number of adjustments. open When it exceeds 100%, the system issues a valve overshoot warning; When Δq<0, the value V=V H , open the high calorific value pipeline valve and press V open =i·V min Iterate until the curve of Δq and i reaches the extreme point, where i is the number of adjustments. open When it exceeds 100%, the system issues a valve overshoot warning; If the valve V is adjusted to assign a specific valve variable, the current valve opening degree is recorded as V open_0 , calculate the adjustment direction variable a=Δq / |Δq|, at the same time, when V=V L When V = V H When variable b = -1, adjust V corresponding to the valve and press V open =V open_0 +a·b·i·V min Iterate until the curve of Δq and i reaches the extreme point, where i is the number of adjustments. open When it exceeds 100% or is lower than 0, the system issues a valve overshoot warning; Dynamic adjustment is completed, and the current parameters are recorded, including: P1, P2, T1, T2, q1, q2, Q1, Q2, V, V open .

8. The regulating system of the natural gas calorific value regulating device according to claim 7 is characterized in that: The natural gas calorific value regulation system also includes a model iteration module. When the dynamic regulation record parameters accumulate to a specified number, the system integrates the newly added data to the pipeline flow Q2 and the valve opening V open Make training adjustments.

9. A method for regulating the calorific value of natural gas, applied to a regulating system of a natural gas calorific value regulating device according to any one of claims 7-8, characterized in that: The natural gas calorific value adjustment method completes the data processing of the data processing module and completes the dynamic adjustment of the natural gas calorific value of the dynamic adjustment module.

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