A back pressure engine control system

Abstract

The application discloses a back pressure turbine generator control system, comprising: a back pressure turbine generator, a sensor assembly, an inlet steam adjusting module, a power generation power supply module and a control unit. The application monitors the steam parameters of the inlet and outlet of the back pressure turbine generator in real time through the sensor and feeds back to the control unit, and the control unit calculates the enthalpy difference value to diagnose the system energy efficiency. When the efficiency is low, the control unit integrates the equipment operating load and the user steam demand, dynamically calculates and outputs the two optimization target intervals of the steam parameters and the motor power, and then drives the inlet steam adjusting module and the power generation power supply module to adjust coordinately. Thus, a closed-loop dynamic control is formed, the efficient coordinated conversion of steam and electric energy is ensured, the power transmission loss is reduced, the system comprehensive energy saving rate is improved by more than 40% compared with the traditional throttling steam supply mode, the dual goals of accurate steam parameter adaptation and high efficiency enthalpy recovery are realized, the enterprise external power dependence is reduced, and the energy cascade utilization efficiency is maximized.

Description

Technical Field

[0001] This application relates to the field of energy recycling technology, and in particular to a back pressure machine control system. Background Technology

[0002] In industrial production, power plants often face the problem of mismatch between steam supply parameters and the demand parameters of heat users. For example, the medium-pressure steam parameters output by the power plant are much higher than the actual steam consumption parameters of external heat users. Traditional solutions use direct throttling to reduce pressure and temperature, which wastes a large amount of steam enthalpy and results in low energy efficiency. At the same time, key equipment in the power station, such as air compressors and refrigeration systems, consume a large amount of external electrical energy, further increasing the company's energy costs. Summary of the Invention

[0003] In view of this, this application provides a back pressure turbine control system, which solves the problem of enthalpy waste caused by the mismatch between the steam supply parameters of existing power plants and the demand parameters of heat users.

[0004] According to one aspect of this application, a back pressure machine control system is provided, comprising: A back-pressure steam turbine generator has a steam inlet end, a steam outlet end, and an electrical output end. The steam inlet end is connected to the steam pipeline network of the power plant, the steam outlet end is connected to the steam distribution cylinder of the user pipeline network, and the electrical output end is electrically connected to the high-voltage power transmission system. The back-pressure steam turbine generator is used to convert the thermal energy of the steam output from the power plant into electrical energy. A sensor assembly is provided at the steam inlet and the steam outlet, and the sensor module is used to collect steam parameters at the steam inlet and the steam outlet of the back-pressure steam turbine generator. A steam inlet regulating module is installed on the steam inlet pipeline of the back-pressure steam turbine generator. The steam inlet regulating module is used to regulate the steam inlet parameters of the back-pressure steam turbine generator. A power generation and supply module is connected between the power output terminal and the high-voltage transmission system. The power generation and supply module is used to process the electrical energy generated by the back-pressure steam turbine generator and supply it to the electrical load through the high-voltage transmission system. The control unit is electrically connected to the sensor assembly, the steam inlet regulating module, and the power generation module, respectively. The control unit is used to calculate the enthalpy difference between the steam inlet and the exhaust end based on the steam parameters. When the enthalpy recovery efficiency reflected by the enthalpy difference is lower than the efficiency threshold, the control unit determines a first target range of the steam parameters and a second target range of the motor output power based on the equipment operating load and the user's steam demand, and controls the steam inlet regulating module and the power generation module respectively based on the first target range and the second target range.

[0005] Optionally, the steam inlet regulating module includes: an opening regulating valve and a pre-positioned pressure stabilizing device; The control unit is used to output an opening adjustment command to the opening adjustment valve when the steam flow rate exceeds the steam flow rate range in the first target range, and / or to output a pressure adjustment command to the pre-pressurization device when the steam pressure exceeds the steam pressure range in the first target range.

[0006] Optionally, the back pressure machine control system further includes: An exhaust steam adapter module is connected between the exhaust end and the user pipeline steam distribution cylinder, and is electrically connected to the control unit. The exhaust steam adapter module is used to adjust the exhaust steam parameters of the back-pressure steam turbine generator. The control unit is used to control the exhaust steam adaptation module to adjust the exhaust steam parameters according to the third target range when the steam parameters at the exhaust end exceed the third target range, wherein the third target range is set based on the user's steam demand.

[0007] Optionally, the exhaust steam adaptation module includes: a temperature compensator and a pressure regulating valve; The control unit is used to output a temperature correction command to the temperature compensator when the exhaust temperature exceeds the exhaust temperature range in the third target range, and / or to output a pressure correction command to the pressure regulating valve when the exhaust pressure exceeds the exhaust pressure range in the third target range.

[0008] Optionally, the exhaust temperature range is configured as 283±5℃; The exhaust pressure range is configured as 1.2 ± 0.05 MPa.

[0009] Optionally, the power generation module includes: A power conversion unit is used to convert the electrical energy generated by the back-pressure steam turbine generator into power frequency AC power that conforms to the second target range. The power conversion unit includes a rectifier and filter unit and an inverter unit. An energy metering device is used to measure and count the total amount of energy recovered from the power generation and supply module.

[0010] Optionally, the power generation module further includes: A grid-connected switching switch is used to switch between the power generation module and the external power supply circuit; The control unit is used to control the grid-connected switching switch to switch to the external power supply circuit when the recovered power is less than the load demand or when the parameters are abnormal.

[0011] Optionally, the back pressure machine control system further includes: A safety protection module is installed at the steam inlet and the power output, and is electrically connected to the sensor assembly and the control unit. The safety protection module is used to cut off the steam inlet and / or power supply. The control unit is used to control safety protection modules to cut off steam intake and / or power supply when steam parameters exceed safety thresholds and / or turbine vibration exceeds limits.

[0012] Optionally, the sensor assembly includes a temperature sensor, a vibration sensor, a pressure sensor, and a flow sensor.

[0013] Optionally, the efficiency threshold is greater than or equal to 85%.

[0014] Using the above technical solution, the back-pressure turbine control system includes a back-pressure turbine generator, sensor components, a steam inlet regulating module, a power generation module, and a control unit. Sensors monitor the steam parameters at the inlet and outlet of the back-pressure turbine in real time and feed them back to the control unit. The control unit calculates the enthalpy difference to diagnose the system's energy efficiency. When efficiency is low, the control unit dynamically calculates and outputs two optimized target ranges for steam parameters and motor power, considering both the equipment's operating load and the user's steam demand. This drives the steam inlet regulating module and the power generation module to make coordinated adjustments. This forms a closed-loop dynamic control, ensuring efficient and coordinated conversion of steam and electricity, reducing transmission losses, and improving the overall energy saving rate by more than 40% compared to traditional throttling steam supply methods. It achieves the dual goals of precise steam parameter matching and efficient enthalpy recovery, reducing the enterprise's dependence on external electricity and maximizing the efficiency of energy cascade utilization.

[0015] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram of the back pressure machine control system provided in an embodiment of this application is shown; Figure 2 A schematic diagram of the control logic of the back pressure machine control system provided in an embodiment of this application is shown.

[0017] Figure label: 110 Back-pressure steam turbine generator, 120 Sensor assembly, 130 Inlet steam regulating module, 131 Opening regulating valve, 132 Pre-voltage stabilizing device, 140 Power generation and supply module, 141 Power conversion unit, 142 Grid connection switching switch, 150 Exhaust steam adapter module, 151 Temperature compensator, 152 Pressure regulating valve, 160 Control unit, 170 Safety protection module, 200 High-voltage transmission system, 300 External power supply circuit. Detailed Implementation

[0018] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “attached” to another element, it can be directly connected or attached to the other element, or there may be intermediate elements. Furthermore, “connected” or “attached” as used herein can include wireless connections or wireless interconnections. The term “and / or” as used herein includes all or any unit and all combinations of one or more associated listed items.

[0021] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0022] This embodiment provides a back pressure machine control system, such as Figure 1 As shown, the back pressure turbine control system includes: a back pressure turbine generator 110, a sensor assembly 120, a steam inlet regulating module 130, a power generation module 140, and a control unit 160.

[0023] Specifically, the back-pressure steam turbine generator 110 has a steam inlet end, a steam outlet end, and an electrical output end. The steam inlet end is connected to the power plant's steam pipeline network, the steam outlet end is connected to the user's pipeline steam distribution cylinder, and the electrical output end is electrically connected to the high-voltage transmission system 200. The back-pressure steam turbine generator 110 is used to convert the thermal energy of the steam output from the power plant into electrical energy. The system's steam source mainly comes from the power plant's high-pressure steam source and medium-pressure steam source. The steam source steam enters the back-pressure steam turbine generator through the steam pipeline network and performs work. The exhaust steam after performing work enters the user's pipeline steam distribution cylinder to meet the industrial heat users' demand for large quantities of stable industrial steam. At the same time, the thermal energy generated by the steam performing work in the back-pressure steam turbine generator 110 is converted into mechanical energy and finally into electrical energy. The generated electrical energy is adjusted in terms of voltage and frequency by the power generation and supply module 140 and then transmitted to the electrical equipment through the high-voltage transmission system 200. This fully utilizes the pressure and temperature potential of steam, improves energy utilization efficiency, and achieves cascaded energy utilization.

[0024] Sensor assembly 120 is installed at the steam inlet and exhaust ends of the back-pressure steam turbine generator 110 to collect steam parameters at these ends. Sensor assembly 120 includes a temperature sensor, a vibration sensor, a pressure sensor, and a flow sensor. The steam parameters include inlet parameters at the inlet end and exhaust parameters at the exhaust end, and may specifically include temperature, pressure, flow rate, vibration, etc.

[0025] The steam inlet regulating module 130 is installed on the steam inlet pipeline of the steam turbine generator set. The steam inlet regulating module 130 is used to regulate the steam inlet parameters of the back pressure steam turbine generator 110.

[0026] The power generation and power supply module 140 is connected between the power output terminal and the high-voltage transmission system 200. The power generation and power supply module 140 is used to process the electrical energy generated by the back-pressure steam turbine generator 110 and supply it to the electrical load through the high-voltage transmission system 200.

[0027] The control unit 160 is electrically connected to the sensor assembly 120, the steam inlet regulating module 130, and the power generation module 140, respectively. The control unit 160 is used to calculate the enthalpy difference between the steam inlet and the steam outlet based on the steam parameters. When the enthalpy recovery efficiency reflected by the enthalpy difference is lower than the efficiency threshold, the control unit 160 determines the first target range of steam parameters and the second target range of motor output power based on the equipment operating load and the user's steam demand, and controls the steam inlet regulating module 130 and the power generation module 140 respectively based on the first target range and the second target range.

[0028] The equipment operating load reflects the actual power generation or energy conversion load currently undertaken by the back-pressure steam turbine generator, such as turbine speed, valve opening, and boiler steam supply capacity, usually expressed as "active power (MW)" or "load rate (%)". User steam demand reflects the real-time consumption demand of downstream heat users (such as factory production and heating systems) for steam flow, pressure, and temperature, usually expressed as "steam flow (t / h)" or "thermal power (GJ / h)".

[0029] Understandably, this efficiency threshold is greater than or equal to 85% to meet the requirement of maximizing enthalpy recovery.

[0030] The back-pressure compressor control system provided in this application uses sensors to monitor the steam parameters at the inlet and outlet of the back-pressure compressor in real time and feeds them back to the control unit. The control unit calculates the enthalpy difference based on this to diagnose the system's energy efficiency status. When the efficiency is low, the control unit comprehensively considers the equipment's operating load and the user's steam demand, dynamically calculates and outputs two optimized target ranges for steam parameters and motor power, and then drives the steam inlet adjustment module and the power generation module to make coordinated adjustments. This forms a closed-loop dynamic control, ensuring efficient and coordinated conversion of steam and electrical energy, reducing transmission losses, and improving the overall energy saving rate of the system by more than 40% compared to traditional throttling steam supply methods. It achieves the dual goals of precise steam parameter matching and efficient enthalpy recovery, reduces the enterprise's dependence on external electricity, and maximizes the efficiency of energy cascade utilization.

[0031] It should be noted that the enthalpy difference is the difference between the enthalpy values ​​corresponding to the temperature and pressure at the inlet steam end and the enthalpy values ​​corresponding to the temperature and pressure at the outlet steam end. The enthalpy value at the corresponding pressure and temperature can be found using a steam enthalpy meter (such as a saturated steam meter or a superheated steam meter), or calculated using thermodynamic software / Steam Tables. The enthalpy recovery efficiency is the quotient of the actual recovered enthalpy difference and the theoretically maximum recoverable enthalpy difference. The actual recovered enthalpy difference can be obtained by dividing the enthalpy recovery amount calculated from the heat energy produced by the back pressure compressor by the steam flow rate. The heat energy produced by the back pressure compressor can be detected using a heat recovery device.

[0032] In practical application scenarios, such as Figure 1 As shown, the steam intake regulating module 130 includes an opening regulating valve 131 and a pre-pressurization device 132. The control unit 160 is electrically connected to the opening regulating valve 131 and the pre-pressurization device 132, respectively.

[0033] Specifically, the opening regulating valve 131 is used to regulate the steam inlet flow rate and can be an electric ball valve, an electric butterfly valve, etc. The pre-pressurization device 132 is used to regulate the steam inlet pressure and can be an electric pressure reducing valve, a booster compressor, etc.

[0034] In this embodiment, a pre-pressurization device to eliminate upstream disturbances and an opening regulating valve for precise steam delivery are installed on the steam inlet pipeline of the back-pressure steam turbine generator. These are independently and collaboratively controlled by the control unit, achieving decoupled management of steam pressure and flow. This not only quickly and accurately maintains the inlet steam parameters within the optimal target range, directly improving enthalpy recovery efficiency, but also significantly enhances the system's anti-interference capability by isolating upstream pressure fluctuations. This ensures the safety and stability of the back-pressure steam turbine generator, a core piece of equipment, and prevents parameter fluctuations from affecting power generation efficiency.

[0035] Furthermore, after determining the first target range that meets the equipment operating load and user steam demand, the control unit compares the current steam flow rate with the steam flow rate range within the first target range. If the steam flow rate exceeds the steam flow rate range, the control unit outputs an opening adjustment command to the opening regulating valve to trigger it to increase or decrease the steam flow rate until the steam flow rate falls within the steam flow rate range. Similarly, the control unit compares the current steam pressure with the steam pressure range within the first target range. If the steam pressure exceeds the steam pressure range, the control unit outputs a pressure adjustment command to the pre-pressurization device to trigger it to change the steam pressure, ensuring stable equipment operation.

[0036] In practical application scenarios, such as Figure 1 As shown, the power generation and supply module includes: a power conversion unit 141, a grid connection switching switch 142, and an energy metering device (not shown in the figure). The control unit 160 is electrically connected to the power conversion unit 141, the grid connection switching switch 142, and the energy metering device.

[0037] Specifically, the power conversion unit 141 includes a rectifier and filter unit and an inverter unit. The electrical energy output by the generator is filtered for impurities and converted from DC to DC by the rectifier and filter unit, and then converted into AC power of the second target range that meets the load requirements by the inverter unit.

[0038] The energy metering device is used to measure and count the total amount of energy recovered from the power generation module 140.

[0039] The grid-connected transfer switch 142 is used to switch between the power generation module 140 and the external power supply circuit 300. When the control unit 160 detects that the recovered power is less than the load demand or that the parameters are abnormal, it can control the grid-connected transfer switch 142 to switch to the external power supply circuit 300.

[0040] In this embodiment, the rectification, filtering, and inversion processes of the power conversion unit convert the raw electrical energy output from the back-pressure turbine generator into clean and stable industrial frequency AC power, precisely matching the second target range of load demand and ensuring power quality and efficiency. Simultaneously, by setting a grid-connected switching switch, flexible switching and reliable grid connection between the module and the external power grid can be ensured, improving the stability and flexibility of system operation, and enhancing energy utilization efficiency and power supply reliability.

[0041] In one embodiment, such as Figure 1 As shown, the back pressure machine control system also includes: exhaust steam adapter module 150.

[0042] Specifically, the exhaust steam adaptation module 150 is connected between the exhaust end and the user pipeline steam distribution cylinder, and is electrically connected to the control unit 160. The exhaust steam adaptation module 150 is used to adjust the exhaust steam parameters of the back-pressure steam turbine generator 110. The control unit 160 is used to control the exhaust steam adaptation module 150 to adjust the exhaust steam parameters according to the third target range when the steam parameters at the exhaust end exceed the third target range.

[0043] The third target range can be reasonably set based on the user's steam demand. For example, the exhaust temperature range can be configured as 283±5℃, and the exhaust pressure range can be configured as 1.2±0.05MPa.

[0044] In this embodiment, the exhaust parameters of the back-pressure steam turbine generator are adjusted in real time by the exhaust steam adaptation module, effectively maintaining the steam parameters within the set third target range and ensuring the stability of exhaust pressure and temperature. With the automatic monitoring and adjustment of the control unit, it can quickly respond to changes in operating conditions, ensure the reliability and safety of the generator set operation, and improve the overall system stability and operating efficiency.

[0045] In practical application scenarios, such as Figure 1 As shown, the exhaust steam adapter module 150 includes a temperature compensator 151 and a pressure regulating valve 152. The temperature compensator 151 is used to regulate the exhaust steam temperature and can be a heating / cooling coil, coil, etc. The pressure regulating valve 152 is used to regulate the exhaust steam pressure and can be a pressure reducing valve, pressure regulating valve, etc.

[0046] Before delivering exhaust steam to the user, control unit 160 compares the current exhaust steam temperature with the exhaust steam temperature range in the third target range. If the exhaust steam temperature exceeds the exhaust steam temperature range, control unit 160 outputs a temperature correction command to temperature compensator 151 to trigger temperature compensator 151 to increase or decrease the exhaust steam temperature until the exhaust steam temperature is within the exhaust steam temperature range. Similarly, control unit 160 compares the current exhaust steam pressure with the exhaust steam pressure range in the third target range. If the exhaust steam pressure exceeds the exhaust steam pressure range in the third target range, control unit 160 outputs a pressure correction command to pressure regulating valve 152 to trigger pressure regulating valve 152 to change the exhaust steam pressure. This ensures that the final output steam parameters are stable within the third target range, meeting the steam demand of external heat users.

[0047] In one embodiment, such as Figure 1 As shown, the back pressure machine control system also includes: a safety protection module 170.

[0048] Specifically, the safety protection module 170 is located at both the steam inlet and the power output end, and is electrically connected to the sensor assembly 120 and the control unit 160. The control unit 160 is used to control the safety protection module 170 to cut off the steam inlet and / or power supply when the steam parameters exceed the safety threshold and / or the turbine vibration exceeds the limit.

[0049] In practical applications, safety protection modules include, but are not limited to, overpressure alarm devices, overtemperature shutdown valves, vibration monitors, and emergency shut-off circuits.

[0050] In this embodiment, a safety protection module is installed at key nodes of the system. When the inlet steam pressure / temperature exceeds the safety threshold, the turbine vibration exceeds the standard, or the exhaust parameters are abnormal, the safety protection module immediately triggers an alarm. In severe cases, it automatically activates the emergency cut-off circuit to cut off the steam supply and power supply, thus preventing equipment damage and safety accidents.

[0051] For specific examples, such as Figure 1As shown, the high-efficiency back-pressure turbine control system is primarily composed of a back-pressure steam turbine generator 110, an inlet steam regulation module 130, an exhaust steam adaptation module 150, a power generation and supply module 140, a central control unit 160, and a safety protection module 170. These modules work together to achieve the recovery and efficient utilization of steam energy. Specifically, the back-pressure steam turbine generator 110 is selected to meet inlet steam parameters of 2.6~3.0 MPa / 360~380℃, and a rated power of 4000 kW is chosen based on the steam processing capacity. Its inlet end is connected to the power plant's medium-pressure steam network via a pipeline. The inlet steam regulation module 130 is installed on the pipeline, sequentially equipped with components such as an electric regulating valve, a pressure transmitter, a flow sensor, and a pre-pressurization device 132. The pressure transmitter and flow sensor collect steam parameters in real time and feed them back to the central control unit 160. The central control unit 160 controls the electric regulating valve to adjust the inlet steam flow based on the equipment's operating load and the user's steam demand. The exhaust end is connected to the exhaust adapter module 150 via a pipeline. After receiving the exhaust steam from the turbine, the exhaust adapter module 150 adjusts the steam temperature through the temperature compensator 151, and the pressure regulating valve 152 precisely controls the exhaust pressure. The constant temperature and pressure controller monitors and corrects parameter deviations in real time, and finally connects to the external heat user's steam pipeline network. The power output end of the back-pressure turbine generator 110 is connected to the rectifier and filter unit of the power generation and supply module 140. The output end of the inverter unit is connected to the power supply control cabinet of the softened water system, etc., via a cable. The grid-connected switching switch 142 is connected in parallel with the external power supply circuit 300, and the power metering device is connected in series in the power supply circuit. The central control unit 160 is connected to the sensors and electric regulating valve of the steam inlet regulating module 130, the controller and regulating valve of the exhaust adapter module 150, the inverter and switching switch of the power generation and supply module 140, and various monitoring devices and actuators of the safety protection module 170 through signal lines to build a complete control network. The system employs a DCS controller as its core, incorporating an enthalpy calculation model based on the thermodynamic characteristics of steam to calculate the enthalpy difference between the inlet and outlet steam in real time. Combined with real-time power load data from the air compressor and refrigeration system within the power station, the operating parameters of the inlet steam regulation module 130 and the power generation and supply module 140 are dynamically adjusted using a matching algorithm to ensure that the enthalpy recovery efficiency is always >85%, while simultaneously guaranteeing stable steam supply parameters.

[0052] like Figure 2 As shown, the operation flow of the high-efficiency back pressure machine control system is as follows: 1. After the system starts, the central control unit initializes the parameters of each module, sets the allowable safe range of steam inlet pressure (2.9-3.1 MPa.a), the target parameters of exhaust steam (1.2 MPa.a / 283℃), the enthalpy recovery efficiency threshold (≥85%), and the safety protection threshold.

[0053] 2. The electric regulating valve of the steam inlet regulating module gradually opens, allowing the medium-pressure steam from the power plant to enter the back-pressure turbine generator after being stabilized by the pre-pressurization device, driving the generator to generate electricity. The back-pressure turbine generator, as the core of energy conversion, receives medium-pressure steam from the power plant at 2.6~3.0 MPa.a / 360~380℃. The steam expands within the turbine, doing work to drive the generator, converting the steam's enthalpy loss into electrical energy. Pressure transmitters and flow sensors provide real-time feedback on the steam inlet parameters, and the central control unit dynamically adjusts the opening of the electric regulating valve to ensure stable equipment operation.

[0054] 3. The power generation and supply module converts the electrical energy output by the generator into 380V / 50Hz industrial frequency AC power. The power supply is counted in real time by the power metering device and fed back to the central control unit for real-time calculation of energy-saving benefits.

[0055] 4. After the back-pressure steam turbine generator performs its work, the exhaust steam is discharged to the exhaust steam adapter module for precise parameter control. The temperature compensator and pressure regulating valve adjust their parameters according to the instructions of the central control unit to ensure that the exhaust steam parameters are precisely matched to 1.2MPa / 283℃, continuously supplying steam to external heat users.

[0056] 5. The safety protection module monitors the system's operating status throughout the process. When abnormal parameters or equipment failures occur, it immediately sends a signal to the central control unit. The central control unit triggers an alarm, adjusts the operating conditions, or initiates an emergency shutdown based on the level of abnormality to ensure system safety.

[0057] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0058] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A back pressure machine control system, characterized in that, The system includes: A back-pressure steam turbine generator has a steam inlet end, a steam outlet end, and an electrical output end. The steam inlet end is connected to the steam pipeline network of the power plant, the steam outlet end is connected to the steam distribution cylinder of the user pipeline network, and the electrical output end is electrically connected to the high-voltage power transmission system. The back-pressure steam turbine generator is used to convert the thermal energy of the steam output from the power plant into electrical energy. A sensor assembly is provided at the steam inlet and the steam outlet, and the sensor assembly is used to collect steam parameters at the steam inlet and the steam outlet of the back-pressure steam turbine generator. A steam inlet regulating module is installed on the steam inlet pipeline of the back-pressure steam turbine generator. The steam inlet regulating module is used to regulate the steam inlet parameters of the back-pressure steam turbine generator. A power generation and supply module is connected between the power output terminal and the high-voltage transmission system. The power generation and supply module is used to process the electrical energy generated by the back-pressure steam turbine generator and supply it to the electrical load through the high-voltage transmission system. The control unit is electrically connected to the sensor assembly, the steam inlet regulating module, and the power generation module, respectively. The control unit is used to calculate the enthalpy difference between the steam inlet and the exhaust end based on the steam parameters. When the enthalpy recovery efficiency reflected by the enthalpy difference is lower than the efficiency threshold, the control unit determines a first target range of the steam parameters and a second target range of the motor output power based on the equipment operating load and the user's steam demand, and controls the steam inlet regulating module and the power generation module respectively based on the first target range and the second target range.

2. The back pressure machine control system according to claim 1, characterized in that, The steam inlet regulating module includes: an opening regulating valve and a pre-positioned pressure stabilizing device; The control unit is used to output an opening adjustment command to the opening adjustment valve when the steam flow rate exceeds the steam flow rate range in the first target range, and / or to output a pressure adjustment command to the pre-pressurization device when the steam pressure exceeds the steam pressure range in the first target range.

3. The back pressure machine control system according to claim 1, characterized in that, The system also includes: An exhaust steam adapter module is connected between the exhaust end and the user pipeline steam distribution cylinder, and is electrically connected to the control unit. The exhaust steam adapter module is used to adjust the exhaust steam parameters of the back-pressure steam turbine generator. The control unit is used to control the exhaust steam adaptation module to adjust the exhaust steam parameters according to the third target range when the steam parameters at the exhaust end exceed the third target range, wherein the third target range is set based on the user's steam demand.

4. The back pressure machine control system according to claim 3, characterized in that, The exhaust steam adaptation module includes: a temperature compensator and a pressure regulating valve; The control unit is used to output a temperature correction command to the temperature compensator when the exhaust temperature exceeds the exhaust temperature range in the third target range, and / or to output a pressure correction command to the pressure regulating valve when the exhaust pressure exceeds the exhaust pressure range in the third target range.

5. The back pressure machine control system according to claim 4, characterized in that, The exhaust temperature range is configured as 283±5℃; The exhaust pressure range is configured as 1.2 ± 0.05 MPa.

6. The back pressure machine control system according to claim 1, characterized in that, The power generation module includes: A power conversion unit is used to convert the electrical energy generated by the back-pressure steam turbine generator into power frequency AC power that conforms to the second target range. The power conversion unit includes a rectifier and filter unit and an inverter unit. An energy metering device is used to measure and count the total amount of energy recovered from the power generation and supply module.

7. The back pressure machine control system according to claim 1, characterized in that, The power generation module also includes: A grid-connected switching switch is used to switch between the power generation module and the external power supply circuit; The control unit is used to control the grid-connected switching switch to switch to the external power supply circuit when the recovered power is less than the load demand or when the parameters are abnormal.

8. The back pressure machine control system according to claim 1, characterized in that, The system also includes: A safety protection module is installed at the steam inlet and the power output, and is electrically connected to the sensor assembly and the control unit. The safety protection module is used to cut off the steam inlet and / or power supply. The control unit is used to control the safety protection module to cut off the steam intake and / or power supply when the steam parameters exceed the safety threshold and / or the turbine vibration exceeds the standard.

9. The back pressure machine control system according to any one of claims 1 to 7, characterized in that, The sensor assembly includes a temperature sensor, a vibration sensor, a pressure sensor, and a flow sensor.

10. The back pressure machine control system according to any one of claims 1 to 7, characterized in that, The efficiency threshold is greater than or equal to 85%.

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