Control method, device, equipment and medium of low-pressure cylinder micro-power heat supply unit

Abstract

The application provides a control method, device, equipment and medium of a low-pressure cylinder micro-power heat supply unit, and belongs to the technical field of heat supply unit control. The method comprises the following steps: obtaining the steam flow of the low-pressure cylinder, the exhaust temperature of the low-pressure cylinder, the theoretical steam flow of the low-pressure cylinder, the valve opening degree value of the heat supply valve corresponding to the theoretical steam flow, and the heat supply valve state; when the exhaust temperature of the low-pressure cylinder does not exceed the first temperature early warning value and the heat supply valve state is in the normal operation condition, determining the PID output adjustment value of the heat supply valve according to the steam flow of the low-pressure cylinder based on the PID algorithm; determining the PID output theoretical value of the heat supply valve according to the theoretical steam flow of the low-pressure cylinder based on the PID algorithm; calculating the PID opening degree deviation value according to the PID output theoretical value and the PID output adjustment value; and correcting the valve opening degree value according to the PID output adjustment value when the PID opening degree deviation value exceeds the preset value. The method can improve the reliability of equipment operation.

Description

Technical Field

[0001] This invention relates to the field of heating unit control technology, specifically to a control method for a low-pressure cylinder low-output heating unit, a control device for a low-pressure cylinder low-output heating unit, an electronic device, and a computer-readable storage medium. Background Technology

[0002] Heating units need to decouple heat and electricity to adapt to market peak shaving, thereby increasing the proportion of clean energy utilization. This is an important means to promote the timely achievement of carbon peaking and carbon neutrality goals. Among these, mid-exhaust extraction steam heating units account for the largest proportion. An effective means to achieve heat and electricity decoupling in mid-exhaust extraction steam heating units is to further reduce the steam inlet flow rate of the low-pressure cylinder. However, further reducing the steam inlet flow rate of the low-pressure cylinder while ensuring the safe operation of the unit is the main problem hindering this type of unit.

[0003] Conventional heating units typically use a butterfly valve on the connecting pipe between the medium and low-pressure cylinders to control the steam extraction flow and the steam inlet flow to the low-pressure cylinder. Most of these butterfly valves are single-gate valves, employing mechanical limiting, gate perforation, or pre-reserved annular gaps to control the steam extraction flow while ensuring a certain steam inlet flow to the low-pressure cylinder. When participating in deep peak shaving or frequent load increases and decreases, this method faces the following problems:

[0004] 1. The minimum flow rate of the heating butterfly valve is too high, which prevents the steam extraction rate from being further increased.

[0005] 2. When the single valve plate is at a small opening, the flow control accuracy is low, which increases the difficulty of operation and identification for operators, and makes it impossible to control accurately in a small flow range;

[0006] 3. When the steam flow rate of the low-pressure cylinder is lower than that of the low-pressure cylinder, manual operation of the heating butterfly valve can easily cause the exhaust parameters of the medium-pressure cylinder to exceed the limit, and the exhaust parameters of the low-pressure cylinder to exceed the limit, thus affecting the safe operation of the main unit. The safety control operation mode of the medium and low-pressure cylinders cannot be effectively automatically adjusted, and the risk to operational safety is further increased.

[0007] A survey of existing technologies for modifying the steam inlet flow of low-pressure cylinders revealed the following issues: Firstly, the connecting pipe butterfly valve must be quickly closed during steam inlet flow reduction to allow rapid passage through the stress hump zone of the cylinder's final blade. This operation carries significant risk and has a limited adjustment range. Secondly, the cooling steam bypass design has a low flow rate, and frequent switching between the main connecting pipe butterfly valve and the cooling bypass valve easily leads to overspeeding during operation, potentially causing dangerous vibrations in the connecting pipe. Thirdly, while water spraying can suppress blowouts in the low-pressure cylinder, the water erosion at the blade tip inlet and the backflow at the blade root outlet are exacerbated because the final and secondary final stages operate in a fully de-flow state.

[0008] Analysis suggests that the main technical approach currently implemented to reduce the steam flow rate of the low-pressure cylinder only addresses two aspects: avoiding the flutter zone and controlling overheating. Furthermore, it suffers from technical limitations such as the need to quickly cross the stress hump zone when switching on the low-pressure cylinder, significant risk of blade water erosion, high operational risks, and a narrow control range, resulting in a relatively low operational safety factor for the low-pressure cylinder. Summary of the Invention

[0009] The purpose of this invention is to provide a control method, device, equipment and medium for low-pressure cylinder low-output heating units, which solves at least the problem of the relatively low operating safety factor of existing low-pressure cylinders.

[0010] To achieve the above objectives, in one aspect, the present invention provides a control method for a low-pressure cylinder low-output heating unit, the method comprising:

[0011] Obtain the steam inlet flow rate of the low-pressure cylinder, the steam outlet temperature of the low-pressure cylinder, the theoretical steam inlet flow rate of the low-pressure cylinder, the valve opening value of the heating valve corresponding to the theoretical steam inlet flow rate, and the status of the heating valve.

[0012] When the heating valve is in normal operating condition, and the exhaust temperature of the low-pressure cylinder does not exceed the first temperature warning value, the PID output adjustment value of the heating valve is determined based on the PID algorithm and the inlet steam flow of the low-pressure cylinder.

[0013] Based on the PID algorithm, the theoretical PID output value of the heating valve is determined according to the theoretical steam flow rate of the low-pressure cylinder.

[0014] Calculate the PID opening deviation value based on the theoretical PID output value and the PID output adjustment value;

[0015] When the PID opening deviation exceeds the preset value, the valve opening value is corrected according to the PID output adjustment value.

[0016] Preferably, the method further includes:

[0017] When the heating valve is in normal operating condition, if the exhaust temperature of the low-pressure cylinder exceeds the first temperature warning value but does not exceed the second temperature warning value, the first rate of increase of the exhaust temperature of the low-pressure cylinder is determined, wherein the second temperature warning value is greater than the first temperature warning value.

[0018] When the first rate of increase is greater than zero, the valve opening value is continuously increased by the first opening increase amount within a first preset time period, so that the first rate of increase is less than zero.

[0019] Preferably, the method further includes:

[0020] When the heating valve is in normal operating condition, if the exhaust temperature of the low-pressure cylinder exceeds the second temperature warning value, the second rate of increase of the exhaust temperature of the low-pressure cylinder is determined.

[0021] When the second rate of increase is greater than zero, the valve opening value is continuously increased by a second opening increase amount within a second preset time period so that the second rate of increase is less than zero; wherein the second opening increase amount is greater than the first opening increase amount.

[0022] Preferably, the method further includes:

[0023] Obtain the real-time back pressure of the heating unit;

[0024] Based on the real-time back pressure of the heating unit, the intake flow range of the low-pressure cylinder is determined, and the minimum intake flow within the intake flow range is taken as the theoretical steam flow.

[0025] Preferably, the method further includes:

[0026] When the heating valve is in the closed process condition, obtain the exhaust parameters of the intermediate pressure cylinder;

[0027] When the exhaust parameters of the intermediate pressure cylinder exceed the preset parameter threshold, determine the third rate of increase of the exhaust parameters of the intermediate pressure cylinder;

[0028] When the third rate of increase is greater than zero, the valve opening value is continuously increased by the third opening increase amount within the third preset time period so that the third rate of increase is less than zero.

[0029] Preferably, the heating valve is a double-gate integrated valve.

[0030] On the other hand, the present invention also provides a control device for a low-pressure cylinder low-output heating unit, the device being used to implement the above-mentioned control method for the low-pressure cylinder low-output heating unit, the device comprising:

[0031] The parameter acquisition module is used to acquire the steam inlet flow rate of the low-pressure cylinder, the steam outlet temperature of the low-pressure cylinder, the theoretical steam inlet flow rate of the low-pressure cylinder, the valve opening value of the heating valve corresponding to the theoretical steam inlet flow rate, and the status of the heating valve.

[0032] The adjustment value determination module is used to determine the PID output adjustment value of the heating valve based on the PID algorithm and the steam inlet flow rate of the low-pressure cylinder when the exhaust steam temperature of the low-pressure cylinder does not exceed the first temperature warning value under the normal operating condition of the heating valve.

[0033] The theoretical value determination module is used to determine the theoretical PID output value of the heating valve based on the theoretical steam flow rate of the low-pressure cylinder using a PID algorithm.

[0034] The deviation calculation module is used to calculate the PID opening deviation value based on the theoretical value and the adjusted value of the PID output.

[0035] The valve opening correction module is used to correct the valve opening value based on the PID output adjustment value when the PID opening deviation value exceeds the preset value.

[0036] Preferably, the device further includes:

[0037] The back pressure acquisition module is used to acquire the real-time back pressure of the heating unit.

[0038] The theoretical steam inlet flow rate determination module is used to determine the range of steam inlet flow rate of the low-pressure cylinder based on the real-time back pressure of the heating unit, and to take the minimum steam inlet flow rate within the range as the theoretical steam inlet flow rate.

[0039] On the other hand, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the low-pressure cylinder micro-output heating unit described above.

[0040] On the other hand, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described control method for a low-pressure cylinder micro-output heating unit.

[0041] Through the above technical solution, the present invention has at least the following technical effects:

[0042] When controlling the heating valve, the present invention adopts a step-by-step control method for the PID output. That is, the PID output adjustment value will only be sent to the heating valve when the PID opening deviation value exceeds the preset value, and the heating valve will only operate at this time. This control method can effectively reduce the number of heating valve operations and improve the reliability of equipment operation.

[0043] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is the structural frame of a low-pressure cylinder micro-output heating unit provided in one embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of a heating valve provided in one embodiment of the present invention;

[0047] Figure 3 This is a flowchart of a control method for a low-pressure cylinder low-output heating unit provided in one embodiment of the present invention;

[0048] Figure 4 This is a control flowchart for the safe operation of a low-pressure cylinder provided in one embodiment of the present invention;

[0049] Figure 5 This is a control flowchart of a low-pressure cylinder low-output heating unit provided in an optional embodiment of the present invention;

[0050] Figure 6 This is a control flowchart for reliable operation of a medium-pressure cylinder provided by one embodiment of the present invention;

[0051] Figure 7 This is a block diagram of a control device for a low-pressure cylinder micro-output heating unit provided in one embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures

[0053] 1-Intermediate pressure cylinder; 2-Heating valve; 3-Condenser; 4-Valve group; 5-Heat user; 6-Intermediate pressure cylinder exhaust parameter acquisition device; 7-Low pressure cylinder inlet parameter acquisition device; 8-Low pressure cylinder exhaust parameter acquisition device; 9-Outer gate; 10-Outer gate control mechanism; 11-Inner gate; 12-Inner gate control mechanism. Detailed Implementation

[0054] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0055] Example 1

[0056] Figure 1 This is the structural frame of a low-pressure cylinder low-output heating unit provided in one embodiment of the present invention, such as... Figure 1 As shown, the low-pressure cylinder low-output heating unit of this embodiment includes: a high-pressure cylinder, a medium-pressure cylinder 1, a low-pressure cylinder, a heating valve 2, a condenser 3, a valve group 4, and a heat user 5;

[0057] The high-pressure cylinder, intermediate-pressure cylinder 1, and low-pressure cylinder are coaxially connected. The first exhaust end of the intermediate-pressure cylinder 1 is connected to the steam input end of the heating valve 2 through a steam pipe. The steam output end of the heating valve 2 is connected to the steam input end of the low-pressure cylinder through a steam pipe. The exhaust end of the low-pressure cylinder is connected to the steam input end of the condenser 3 through a steam pipe.

[0058] The second exhaust end of the intermediate pressure cylinder 1 is connected to the steam input end of the valve group 4 through a steam pipe, and the steam output end of the valve group 4 is connected to the steam input end of the heat user 5 through a steam pipe.

[0059] A steam discharge parameter acquisition device for intermediate pressure cylinder 1 is installed on the steam pipeline between the first exhaust end of intermediate pressure cylinder 1 and the steam input end of heating valve 2. The steam discharge parameter acquisition device for intermediate pressure cylinder 1 mainly includes a flow meter, a pressure meter and a thermometer, which are used to collect the steam discharge flow rate, steam discharge pressure and steam discharge temperature of intermediate pressure cylinder 1 respectively.

[0060] A low-pressure cylinder steam inlet parameter acquisition device 7 is installed on the steam pipeline between the steam inlet end of the low-pressure cylinder and the steam outlet end of the heating valve 2. The low-pressure cylinder steam inlet parameter acquisition device 7 mainly includes a flow meter, a pressure meter and a thermometer, which are used to collect the steam inlet flow, steam inlet pressure and steam inlet temperature of the low-pressure cylinder respectively.

[0061] A low-pressure cylinder exhaust parameter acquisition device 8 is installed on the steam pipeline between the exhaust end of the low-pressure cylinder and the steam input end of the condenser 3. The low-pressure cylinder exhaust temperature acquisition device mainly includes a flow meter, a pressure meter and a thermometer, which are used to collect the exhaust flow rate, exhaust pressure and exhaust temperature of the low-pressure cylinder respectively.

[0062] The heating valve 2 in this embodiment adopts a double gate integrated valve, which includes an outer gate 9 and an inner gate 11, as well as an outer gate control mechanism 10 and an inner gate control mechanism 12. This valve can avoid the performance problems, gate hole drilling or reserved annular gap problems of the original heating butterfly valve. The double gate integrated heating butterfly valve can realize wide-range precise adjustment of the steam flow of the low-pressure cylinder.

[0063] Based on the above-mentioned low-pressure cylinder low-output heating unit, this embodiment also provides a control method for the low-pressure cylinder low-output heating unit. Figure 3 This is a flowchart of a control method for a low-pressure cylinder low-output heating unit according to one embodiment of the present invention, as shown below. Figure 3 As shown, the method includes:

[0064] Step S101: Obtain the steam inlet flow rate of the low-pressure cylinder, the steam outlet temperature of the low-pressure cylinder, the theoretical steam inlet flow rate of the low-pressure cylinder, the valve opening value of the heating valve corresponding to the theoretical steam inlet flow rate, and the status of the heating valve.

[0065] The heating valve states in this embodiment include: normal operation state and closing process state, wherein the normal operation state is when the heating valve is in normal operation, and the closing process state is when the heating valve is in the closing process.

[0066] Step S102: When the heating valve is in normal operating condition, and the exhaust temperature of the low-pressure cylinder does not exceed the first temperature warning value, the PID output adjustment value of the heating valve is determined based on the PID algorithm and the steam inlet flow rate of the low-pressure cylinder.

[0067] In this embodiment, the steam flow rate of the low-pressure cylinder is input to the first PID controller. After the steam flow rate of the low-pressure cylinder is processed by the PID algorithm, the first PID controller can output the PID output adjustment value of the heating valve.

[0068] Step S103: Based on the PID algorithm, determine the theoretical PID output value of the heating valve according to the theoretical steam flow rate of the low-pressure cylinder;

[0069] In this embodiment, the theoretical steam flow rate of the low-pressure cylinder is the set value of the first PID controller. After the theoretical steam flow rate of the low-pressure cylinder is processed by the PID algorithm, the first PID controller can output the theoretical PID output value of the heating valve.

[0070] The theoretical steam inlet flow rate of the low-pressure cylinder in this embodiment can be calculated based on the real-time back pressure of the heating unit. Specifically, the method further includes:

[0071] Step a01: Obtain the real-time back pressure of the heating unit;

[0072] Step a01: Determine the intake flow range of the low-pressure cylinder based on the real-time back pressure of the heating unit, and take the minimum intake flow within the intake flow range as the theoretical steam flow.

[0073] Therefore, the theoretical steam flow rate of the low-pressure cylinder can be updated based on the real-time back pressure, which helps to improve the control accuracy of the heating valve.

[0074] Step S104: Calculate the PID opening deviation value based on the theoretical PID output value and the PID output adjustment value;

[0075] Step S105: When the PID opening deviation value exceeds the preset value, the valve opening value is corrected according to the PID output adjustment value.

[0076] This embodiment uses a dual-gate integrated heating valve applied to a low-pressure cylinder low-output flexible operation heating unit, which can achieve wide-range and precise adjustment of the steam flow rate in the low-pressure cylinder. Furthermore, when controlling the heating valve, the PID output adopts a step-by-step control method, that is, when the PID opening deviation value exceeds the preset value, for example, when the PID opening deviation value exceeds 1.5%, the PID output adjustment value will be sent to the heating valve, and the heating valve will then operate. This control method can effectively reduce the number of heating valve operations and improve the reliability of equipment operation.

[0077] As a further optimization of this embodiment, in order to improve the operational safety of the low-pressure cylinder, such as Figure 4 As shown, the method further includes:

[0078] Step b01: When the heating valve is in normal operating condition, when the exhaust temperature of the low-pressure cylinder exceeds the first temperature warning value but does not exceed the second temperature warning value, determine the first rate of increase of the exhaust temperature of the low-pressure cylinder, wherein the second temperature warning value is greater than the first temperature warning value.

[0079] In this embodiment, the exhaust temperature of the low-pressure cylinder, which is collected in real time, is input into the timer. The exhaust temperature of the low-pressure cylinder is then delayed to obtain the delayed temperature corresponding to the exhaust temperature of the low-pressure cylinder. Then, the exhaust temperature of the low-pressure cylinder and the corresponding delayed temperature are input into the subtractor for subtraction to obtain the first rise rate (first rise rate = (exhaust temperature of low-pressure cylinder - delayed temperature) / delay duration).

[0080] Step b02: When the first rate of increase is greater than zero, the valve opening value is continuously increased by the first opening increase amount within a first preset time period so that the first rate of increase is less than zero.

[0081] In this embodiment, when the first rate of increase is greater than zero, it indicates that the exhaust temperature of the low-pressure cylinder exceeds the first temperature warning value and has an upward trend. The first preset duration is preferably 5 minutes. Within these 5 minutes, PID control lockout information is generated. The lockout signal is used to lock out the first PID controller. At this time, steps S102 to S105 are suspended within the first preset duration, and the valve opening value of the heating valve is increased. The first increase in opening value can be: the valve opening value increases by 5% every 10 seconds; or every 10 seconds, the valve opening value is increased by 5% in the first 5 seconds and the last 5 seconds are waiting time.

[0082] If the first rate of increase is still greater than zero after 10 seconds, the valve opening is increased by 5% every 10 seconds to make the first rate of increase less than zero. If the first rate of increase is still greater than zero after 5 minutes, an alarm signal is generated to inform the staff that there is a fault in the heating unit. When the first rate of increase is less than zero, the exhaust temperature of the low-pressure cylinder will show a downward trend, which can reduce the exhaust temperature of the low-pressure cylinder to below the first temperature warning value. After the exhaust temperature of the low-pressure cylinder is reduced to the first temperature warning value, steps S102 to S105 are executed again to adjust the intake flow of the low-pressure cylinder.

[0083] As a further optimization of this embodiment, such as Figure 5 As shown, the method further includes:

[0084] Step c01: When the heating valve is in normal operating condition, and the exhaust temperature of the low-pressure cylinder exceeds the second temperature warning value, determine the second rate of increase of the exhaust temperature of the low-pressure cylinder.

[0085] When the exhaust temperature of the low-pressure cylinder exceeds the second temperature warning value, it indicates that the rate of increase of the exhaust temperature of the low-pressure cylinder is relatively large, and the adjustment methods in steps b01 to b02 are insufficient to reduce the exhaust temperature of the low-pressure cylinder.

[0086] At this time, the exhaust temperature of the low-pressure cylinder, which is collected in real time, is input into the timer. The exhaust temperature of the low-pressure cylinder is delayed to obtain the delayed temperature corresponding to the exhaust temperature of the low-pressure cylinder. Then, the exhaust temperature of the low-pressure cylinder and the corresponding delayed temperature are input into the subtractor for subtraction to obtain the second rise rate (second rise rate = (exhaust temperature of low-pressure cylinder - delayed temperature) / delay duration).

[0087] Step c02: When the second rising rate is greater than zero, within a second preset time period, the valve opening value is continuously increased by a second opening increase amount so that the second rising rate is less than zero; wherein, the second opening increase amount is greater than the first opening increase amount.

[0088] In this embodiment, the first preset duration is preferably 5 minutes. Within these 5 minutes, PID control interlocking information is generated. The interlocking signal is used to interlock the first PID controller. At this time, steps S102 to S105 are suspended for the second preset duration, and the valve opening value of the heating valve is increased. The second increase in opening value can be: the valve opening value increases by 10% every 10 seconds; or the valve opening value is increased by 10% for the first 5 seconds and then the last 5 seconds are a waiting time.

[0089] If the second rate of increase is still greater than zero after 10 seconds, the valve opening is increased by 10% every 10 seconds to make the second rate of increase less than zero. If the second rate of increase is still greater than zero after 5 minutes, an alarm signal is generated to inform the staff that there is a fault in the heating unit. When the second rate of increase is less than zero, the exhaust temperature of the low-pressure cylinder will show a downward trend, which can reduce the exhaust temperature of the low-pressure cylinder to below the first temperature warning value. After the exhaust temperature of the low-pressure cylinder is reduced to the first temperature warning value, steps S102 to S105 are executed again to adjust the intake flow of the low-pressure cylinder.

[0090] In this embodiment, a piecewise function of the exhaust temperature of the low-pressure cylinder can be constructed. When the exhaust temperature of the low-pressure cylinder exceeds the first temperature warning value but does not exceed the second temperature warning value, the piecewise function outputs a first output value (the first output value is 5). The first output value is input into the second PID controller. The proportional P of the second PID controller is 0, the integral time I is 5, and the output value of the second PID controller is the first opening increase (5%).

[0091] When the exhaust temperature exceeds the second temperature warning value, the piecewise function outputs the second output value (the second output value is 10), and inputs the second output value into the second PID controller. The proportional P of the second PID controller is 0, the integral time I is 5, and the output value of the second PID controller is the second opening increase (the second opening increase is 10%). This method can improve the stability and speed of temperature control of the low-pressure cylinder.

[0092] As a further optimization of this embodiment, during the closing of the heating valve, the intermediate pressure and exhaust temperature are prone to increase. To protect the intermediate pressure cylinder and improve its operational reliability; for example... Figure 6 As shown, the method further includes:

[0093] Step d01: When the heating valve is in the closed state, obtain the exhaust parameters of the intermediate pressure cylinder;

[0094] Step d02: When the exhaust parameters of the intermediate pressure cylinder exceed the preset parameter threshold, determine the third rate of increase of the exhaust parameters of the intermediate pressure cylinder;

[0095] In this embodiment, the exhaust parameters mainly include: the exhaust pressure of the intermediate pressure cylinder and the exhaust temperature of the intermediate pressure cylinder. The corresponding preset parameter thresholds include: preset pressure and preset temperature. At this time, the third rise rate includes: pressure rise rate and temperature rise rate.

[0096] When the exhaust pressure of the intermediate pressure cylinder exceeds the preset pressure and / or the exhaust temperature of the intermediate pressure cylinder exceeds the preset temperature, the pressure rise rate and temperature rise rate are calculated.

[0097] Step d03: When the third rate of increase is greater than zero, within the third preset time period, the valve opening value is continuously increased by the third opening increase amount so that the third rate of increase is less than zero.

[0098] When the exhaust pressure of the intermediate pressure cylinder exceeds the preset pressure and the exhaust pressure still has an upward trend, the valve opening is adjusted in step d03 to reduce the pressure rise rate to less than zero.

[0099] When the exhaust temperature of the intermediate pressure cylinder exceeds the preset temperature and the exhaust temperature still has an upward trend, the valve opening is adjusted in step d03 to reduce the rate of temperature rise to less than zero.

[0100] When the exhaust pressure of the intermediate pressure cylinder exceeds the preset pressure and the exhaust temperature of the intermediate pressure cylinder exceeds the preset temperature, and at the same time, the exhaust pressure and exhaust temperature also show an upward trend, the valve opening is adjusted in step d03 to reduce the pressure rise rate and temperature rise rate to less than zero.

[0101] In this embodiment, when the exhaust pressure of the intermediate pressure cylinder exceeds the preset pressure or the exhaust temperature of the intermediate pressure cylinder exceeds the preset temperature, and when the third rising rate is greater than zero, it indicates that there is a risk of overpressure or overheating of the intermediate pressure cylinder.

[0102] In this embodiment, the third preset duration is 5 minutes, and the third opening increase can be: the valve opening value increases by 10% every 10 seconds; or the valve opening value is increased by 10% for the first 5 seconds and then the last 5 seconds are a waiting time.

[0103] If the third rate of increase is still greater than zero after 10 seconds, the valve opening is increased by 10% every 10 seconds to make the third rate of increase less than zero. If the third rate of increase is still greater than zero after 5 minutes, an alarm signal is generated to inform the staff that there is a fault in the heating unit. When the third rate of increase is less than zero, the exhaust pressure or exhaust temperature of the intermediate pressure cylinder will show a downward trend, which can bring the exhaust pressure and exhaust temperature of the intermediate pressure cylinder below the preset pressure and temperature. When the exhaust pressure and exhaust temperature of the intermediate pressure cylinder are below the preset pressure and temperature, the exhaust pressure and exhaust temperature of the intermediate pressure cylinder will be restored to the safe and stable operating range.

[0104] In this embodiment, a parameter function for the intermediate pressure cylinder can be constructed. When the exhaust pressure of the intermediate pressure cylinder exceeds the preset pressure or the exhaust temperature of the intermediate pressure cylinder exceeds the preset temperature, and when the third rise rate is greater than zero, the parameter function of the intermediate pressure cylinder outputs a third output value (the third output value is 10). The third output value is input into the third PID controller. The proportional P of the third PID controller is 0, the integral time I is 5, and the output value of the third PID controller is the third opening increase (10%). This method can improve the control stability and speed of the temperature and pressure of the intermediate pressure cylinder.

[0105] Example 2

[0106] Figure 7 This is a block diagram of a control device for a low-pressure cylinder low-output heating unit provided in one embodiment of the present invention, as shown below. Figure 7 As shown, based on the same inventive concept as Embodiment 1, this embodiment also provides a control device for a low-pressure cylinder low-output heating unit. The device is used to implement the control method for the low-pressure cylinder low-output heating unit of Embodiment 1. The device includes:

[0107] The parameter acquisition module is used to acquire the steam inlet flow rate of the low-pressure cylinder, the steam outlet temperature of the low-pressure cylinder, the theoretical steam inlet flow rate of the low-pressure cylinder, the valve opening value of the heating valve corresponding to the theoretical steam inlet flow rate, and the status of the heating valve.

[0108] The adjustment value determination module is used to determine the PID output adjustment value of the heating valve based on the PID algorithm and the steam inlet flow rate of the low-pressure cylinder when the exhaust steam temperature of the low-pressure cylinder does not exceed the first temperature warning value under the normal operating condition of the heating valve.

[0109] The theoretical value determination module is used to determine the theoretical PID output value of the heating valve based on the theoretical steam flow rate of the low-pressure cylinder using a PID algorithm.

[0110] The deviation calculation module is used to calculate the PID opening deviation value based on the theoretical value and the adjusted value of the PID output.

[0111] The valve opening correction module is used to correct the valve opening value based on the PID output adjustment value when the PID opening deviation value exceeds the preset value.

[0112] As a further optimization of this embodiment, the device further includes:

[0113] The back pressure acquisition module is used to acquire the real-time back pressure of the heating unit.

[0114] The theoretical steam inlet flow rate determination module is used to determine the range of steam inlet flow rate of the low-pressure cylinder based on the real-time back pressure of the heating unit, and to take the minimum steam inlet flow rate within the range as the theoretical steam inlet flow rate.

[0115] This embodiment uses a dual-gate integrated heating valve applied to a low-pressure cylinder low-output flexible operation heating unit, which can achieve wide-range and precise adjustment of the steam flow rate in the low-pressure cylinder. Furthermore, when controlling the heating valve, the PID output adopts a step-by-step control method, that is, when the PID opening deviation value exceeds the preset value, for example, when the PID opening deviation value exceeds 1.5%, the PID output adjustment value will be sent to the heating valve, and the heating valve will then operate. This control method can effectively reduce the number of heating valve operations and improve the reliability of equipment operation.

[0116] Based on the same inventive concept as Embodiment 1, this embodiment also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method of the low-pressure cylinder micro-output heating unit described above.

[0117] Based on the same inventive concept as Embodiment 1, this embodiment also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described control method for a low-pressure cylinder micro-output heating unit.

[0118] This embodiment uses a dual-gate integrated heating valve applied to a low-pressure cylinder low-output flexible operation heating unit, which can achieve wide-range and precise adjustment of the steam flow rate in the low-pressure cylinder. Furthermore, when controlling the heating valve, the PID output adopts a step-by-step control method, that is, when the PID opening deviation value exceeds the preset value, for example, when the PID opening deviation value exceeds 1.5%, the PID output adjustment value will be sent to the heating valve, and the heating valve will then operate. This control method can effectively reduce the number of heating valve operations and improve the reliability of equipment operation.

[0119] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0120] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0121] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0122] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0123] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0124] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0125] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0126] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0127] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for a low-pressure cylinder low-output heating unit, characterized in that, The method includes: Obtain the steam inlet flow rate of the low-pressure cylinder, the steam outlet temperature of the low-pressure cylinder, the theoretical steam inlet flow rate of the low-pressure cylinder, the valve opening value of the heating valve corresponding to the theoretical steam inlet flow rate, and the status of the heating valve. When the heating valve is in normal operating condition, and the exhaust temperature of the low-pressure cylinder does not exceed the first temperature warning value, the PID output adjustment value of the heating valve is determined based on the PID algorithm and the inlet steam flow of the low-pressure cylinder. Based on the PID algorithm, the theoretical PID output value of the heating valve is determined according to the theoretical steam flow rate of the low-pressure cylinder. Calculate the PID opening deviation value based on the theoretical PID output value and the PID output adjustment value; When the PID opening deviation exceeds the preset value, the valve opening value is corrected according to the PID output adjustment value.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the real-time back pressure of the heating unit; Based on the real-time back pressure of the heating unit, the intake flow range of the low-pressure cylinder is determined, and the minimum intake flow within the intake flow range is taken as the theoretical steam flow.

3. The method according to claim 1, characterized in that, The method further includes: When the heating valve is in normal operating condition, if the exhaust temperature of the low-pressure cylinder exceeds the first temperature warning value but does not exceed the second temperature warning value, the first rate of increase of the exhaust temperature of the low-pressure cylinder is determined, wherein the second temperature warning value is greater than the first temperature warning value. When the first rate of increase is greater than zero, the valve opening value is continuously increased by the first opening increase amount within a first preset time period, so that the first rate of increase is less than zero.

4. The method according to claim 3, characterized in that, The method further includes: When the heating valve is in normal operating condition, if the exhaust temperature of the low-pressure cylinder exceeds the second temperature warning value, the second rate of increase of the exhaust temperature of the low-pressure cylinder is determined. When the second rate of increase is greater than zero, the valve opening value is continuously increased by the second opening increase amount within the second preset time period so that the second rate of increase is less than zero.

5. The method according to claim 1, characterized in that, The method further includes: When the heating valve is in the closed process condition, obtain the exhaust parameters of the intermediate pressure cylinder; When the exhaust parameters of the intermediate pressure cylinder exceed the preset parameter threshold, determine the third rate of increase of the exhaust parameters of the intermediate pressure cylinder; When the third rate of increase is greater than zero, the valve opening value is continuously increased by the third opening increase amount within the third preset time period so that the third rate of increase is less than zero.

6. The method according to claim 1, characterized in that, The heating valve is a double-gate integrated valve.

7. A control device for a low-pressure cylinder low-output heating unit, the device being used to implement the control method for the low-pressure cylinder low-output heating unit according to any one of claims 1-6, characterized in that, The device includes: The parameter acquisition module is used to acquire the steam inlet flow rate of the low-pressure cylinder, the steam outlet temperature of the low-pressure cylinder, the theoretical steam inlet flow rate of the low-pressure cylinder, the valve opening value of the heating valve corresponding to the theoretical steam inlet flow rate, and the status of the heating valve. The adjustment value determination module is used to determine the PID output adjustment value of the heating valve based on the PID algorithm and the steam inlet flow rate of the low-pressure cylinder when the heating valve is in normal operating condition and the exhaust steam temperature of the low-pressure cylinder does not exceed the first temperature warning value. The theoretical value determination module is used to determine the theoretical PID output value of the heating valve based on the theoretical steam flow rate of the low-pressure cylinder using a PID algorithm. The deviation calculation module is used to calculate the PID opening deviation value based on the theoretical value and the adjusted value of the PID output. The valve opening correction module is used to correct the valve opening value based on the PID output adjustment value when the PID opening deviation value exceeds the preset value.

8. The control device for the low-pressure cylinder micro-output heating unit according to claim 7, characterized in that, The device further includes: The back pressure acquisition module is used to acquire the real-time back pressure of the heating unit. The theoretical steam inlet flow rate determination module is used to determine the range of steam inlet flow rate of the low-pressure cylinder based on the real-time back pressure of the heating unit, and to take the minimum steam inlet flow rate within the range as the theoretical steam inlet flow rate.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method for the low-pressure cylinder low-output heating unit as described in any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the control method for the low-pressure cylinder micro-output heating unit as described in any one of claims 1-6.

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