A coupled energy supply regulation method and coupled energy supply system thereof

Abstract

The application provides a coupling energy supply adjustment method and a coupling energy supply system. The coupling energy supply adjustment method is used for predicting a main steam temperature and a main steam flow after a time lag by using current waste heat resources, the main steam being generated by a steam generation device using current input waste heat; predicting system thermal efficiency and system efficiency of the coupling energy supply system according to the main steam temperature and the main steam flow after the time lag, the current waste heat resource amount and a power equipment exhaust temperature; calculating a comprehensive evaluation value according to the system thermal efficiency and the system efficiency; and solving a standard main steam temperature and a standard main steam flow after the time lag by taking the main steam temperature and the main steam flow as constraints and taking the comprehensive evaluation value as a maximum target.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a coupled power supply regulation method and a coupled power supply system thereof. Background Technology

[0002] As the average operating rate of cement kilns decreases, cement plant clinker production lines will be shut down for longer periods, resulting in insufficient waste heat generated from clinker calcination. Insufficient waste heat will cause the main steam temperature and flow rate to fall below standard values, leading to low generator power output.

[0003] Furthermore, in practical applications, a considerable time elapses between the entry of waste heat resources into the waste heat power generation system and their utilization for power generation. This means that the current waste heat resources and the current waste heat power generation do not correspond. Using this mismatched thermoelectric conversion as a key efficiency metric and control strategy for setting standard values ​​for main steam temperature and flow rate is unreasonable. It only focuses on the efficiency of the "quantity" conversion (the ratio of system power generation to the amount of waste heat resources at the system inlet, i.e., thermal efficiency) while neglecting the efficiency of the "quality" conversion (the ratio of effective exergy output to system exergy input, i.e., efficiency). On the other hand, due to the large time lag in the cement clinker production process, the duration and effect of the waste heat resources at the system inlet are difficult to quantify. Most existing waste heat power generation systems lack timely and accurate internal adjustment mechanisms, leading to unstable generator power generation. Summary of the Invention

[0004] In view of this, this application provides a coupled power supply regulation method and a coupled power supply system to avoid the problem of unstable power generation caused by inaccurate setting of standard values ​​for main steam temperature and main steam flow.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] The first aspect of this application provides a coupled energy supply regulation method applied to a coupled energy supply system, the coupled energy supply system including at least a steam generating device, a combustion supplement device connected to the steam generating device, and a power device connected to the combustion supplement device, the method comprising:

[0007] The time delay time is determined based on the historical process parameter data of the coupled power supply system;

[0008] Using the current waste heat resources, predict the main steam temperature and main steam flow rate after the time lag; the main steam is generated by the steam generating device using the current waste heat resources;

[0009] Based on the main steam temperature after the time delay, the main steam flow rate after the time delay, the current waste heat resources, and the exhaust temperature of the power equipment, the system thermal efficiency and system efficiency of the coupled energy supply system are predicted.

[0010] Calculate the comprehensive evaluation value based on the system thermal efficiency and the system efficiency;

[0011] Using the main steam temperature and the main steam flow rate as constraints, and with the comprehensive evaluation value as the maximum objective, the standard main steam temperature and standard main steam flow rate after the time delay are obtained.

[0012] Optionally, the method further includes:

[0013] The actual main steam flow rate and actual main steam temperature are obtained after the time delay; wherein the steam generating device utilizes actual waste heat resources to generate the steam.

[0014] If the actual main steam flow rate is less than the standard main steam flow rate and the actual main steam temperature is less than the standard main steam temperature, the supplementary combustion device uses a gas-fired heating water pump to supply water at room temperature to generate steam, so that the steam flow rate and the main steam flow rate together reach the standard main steam flow rate, and the steam temperature and the main steam temperature together reach the standard main steam temperature.

[0015] Optionally, the method further includes:

[0016] If the main steam flow rate is less than the standard main steam flow rate, and the actual main steam temperature is greater than the standard main steam temperature, the combustion device uses a gas-fired water pump to supply water at room temperature to generate steam at a second preset temperature, so that the steam flow rate and the main steam flow rate together reach the standard main steam flow rate, and the steam temperature and the main steam temperature together reach the standard main steam temperature; wherein, the second preset temperature is less than the first preset temperature;

[0017] The power equipment uses the steam and the main steam to drive the generator to generate electricity.

[0018] Optionally, the method further includes:

[0019] If the actual main steam flow rate is equal to the standard main steam flow rate, and the actual main steam temperature is less than the standard main steam temperature, then the main steam is heated to the standard main steam temperature.

[0020] The power equipment uses the heated main steam to drive a generator to generate electricity.

[0021] Optionally, determining the time delay based on the historical process parameter data of the coupled power supply system includes:

[0022] Acquire historical process parameter data of the coupled energy supply system, and preprocess the historical process parameter data;

[0023] Using a preset analysis program, the historical waste heat resource temperature and time of the coupled energy supply system, as well as the historical main steam temperature and time of the main steam generated after the historical waste heat resource of the coupled energy supply system enters the steam generation device, are identified from the pre-processed historical process parameter data.

[0024] The time difference between the historical waste heat resource temperature time and the historical main steam temperature time is calculated to obtain the time delay time.

[0025] Optionally, the step of using current waste heat resources to predict the main steam temperature and main steam flow rate after the time lag includes:

[0026] Obtain the current waste heat resources of the coupled energy supply system;

[0027] The main steam temperature after the time lag is predicted using the main steam temperature prediction model and the current waste heat resources.

[0028] The main steam flow rate after the time lag is predicted using the main steam flow rate prediction model and the current waste heat resources.

[0029] Optionally, the current waste heat resources include the current boiler water level, the current waste gas temperature, and the current waste gas flow rate. Predicting the main steam temperature after the time lag using the main steam temperature prediction model and the current waste heat resources includes:

[0030] Input the current exhaust gas temperature, the current exhaust gas flow rate, and the current boiler water level into the main steam temperature prediction model;

[0031] The main steam temperature prediction model uses the current exhaust gas temperature, the current exhaust gas flow rate, and the current boiler water level to predict the main steam temperature after the time lag.

[0032] Optionally, predicting the main steam flow rate after the time lag using the main steam flow rate prediction model and the current waste heat resources includes:

[0033] Input the current exhaust gas temperature, the current exhaust gas flow rate, and the current boiler water level into the main steam flow prediction model;

[0034] The main steam flow prediction model uses the current exhaust gas temperature, the current exhaust gas flow rate, and the current boiler water level to predict the main steam flow rate after the time lag.

[0035] Optionally, predicting the system thermal efficiency and system efficiency of the coupled energy supply system based on the main steam temperature after the time delay, the main steam flow rate after the time delay, the current waste heat resources, and the exhaust temperature of the power equipment includes:

[0036] The main steam temperature after the time delay, the main steam flow rate after the time delay, the current waste heat resources, and the exhaust temperature of the power equipment are input into the thermal efficiency prediction model to predict the system thermal efficiency of the coupled energy supply system.

[0037] The main steam temperature, the main steam flow rate, the current waste heat resources, and the exhaust temperature of the power equipment are input into the efficiency prediction model to predict the system efficiency of the coupled energy supply system.

[0038] A second aspect of this application provides a coupled energy supply system, comprising: a steam generating device, a combustion device, a power equipment, and a generator;

[0039] The input end of the steam generating device receives waste heat, and the output end of the steam generating device is connected to the first input end of the combustion supplement device.

[0040] The second input terminal of the afterburning device receives biomass, the first output terminal of the afterburning device is connected to the input terminal of the power equipment, and the output terminal of the power equipment is connected to the input terminal of the generator;

[0041] The output terminal of the generator is connected to the target device;

[0042] The combustion device is used to perform the coupling power supply regulation method as described in the first aspect of this application.

[0043] Optionally, the afterburning device includes a heating device and a storage device;

[0044] The output end of the steam generating device is connected to the first input end of the heating device; wherein, the first input end of the heating device is the first input end of the combustion supplement device;

[0045] The second input terminal of the heating device is connected to the first output terminal of the storage device, and the first output terminal of the heating device is connected to the input terminal of the power equipment; wherein, the first output terminal of the heating device is the first output terminal of the afterburning device;

[0046] The heating device is used to perform the coupling power supply regulation method as provided in the first aspect of this application.

[0047] Optional features also include: direct-fired flue gas turbines;

[0048] The first input terminal of the flue gas direct combustion engine is connected to the second output terminal of the supplementary combustion device, and the second input terminal of the flue gas direct combustion engine is connected to the third output terminal of the supplementary combustion device.

[0049] Optionally, the afterburning device includes a heating device and a storage device;

[0050] The first input terminal of the flue gas direct combustion engine is connected to the second output terminal of the heating device, and the second input terminal of the flue gas direct combustion engine is connected to the second output terminal of the storage device;

[0051] Wherein, the second output end of the heating device is the second output end of the combustion supplement device, and the second output end of the storage device is the third output end of the combustion supplement device.

[0052] Optionally, the storage device includes: a gasification device, a purification device, and a gas storage device;

[0053] The gasification device receives biomass at its input end, and its output end is connected to the input end of the purification device; wherein, the input end of the gasification device is the second input end of the afterburner.

[0054] The output end of the purification device is connected to the input end of the gas storage device, and the first output end of the gas storage device is connected to the second input end of the heating device; wherein, the first output end of the gas storage device is the first output end of the storage device.

[0055] The coupled power supply regulation method provided in this application analyzes the time delay of the coupled power supply system to predict the main steam temperature and flow rate after the time delay based on the current waste heat resources. Based on the current waste heat resources and the predicted main steam temperature and flow rate after the time delay, the method predicts the system thermal efficiency and system efficiency of the coupled power supply system. Using the main steam temperature and flow rate as constraints and maximizing the comprehensive evaluation value as the objective, the method solves for the standard main steam temperature and flow rate after the time delay. This method not only fully considers the long time that occurs between the waste heat resources entering the waste heat power generation system and the utilization of waste heat resources for power generation, and the large time delay characteristic of the cement clinker production process, but also combines system thermal efficiency and system efficiency. That is, it focuses not only on the efficiency of "quantity" conversion but also on the efficiency of "quality" conversion, thereby improving the accuracy of the standard values ​​of the main steam temperature and flow rate, and ultimately solving the problem of unstable generator power output. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of a coupled power supply system provided in an embodiment of this application;

[0058] Figure 2 This is a schematic diagram of another coupled power supply system provided in an embodiment of this application;

[0059] Figure 3 This is a schematic diagram of another coupled power supply system provided in an embodiment of this application;

[0060] Figure 4 This is a flowchart illustrating a coupling power supply regulation method provided in an embodiment of this application. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] In this application, 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 a process, method, article, or apparatus. Without further limitation, 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.

[0063] See Figure 1 The diagram shows a structural schematic of a coupled energy supply system provided in an embodiment of this application. The coupled energy supply system includes a steam generation device 101, a combustion device 102, a power equipment 103, a generator 104, and a target device.

[0064] Specifically, the input end of the steam generating device 101 receives waste heat, and the output end of the steam generating device 101 is connected to the input end of the combustion supplement device 102.

[0065] The second input end of the afterburning device 102 receives biomass, the first output end of the afterburning device 102 is connected to the input end of the power equipment 103, the output end of the power equipment 103 is connected to the input of the generator 104, and the output end of the generator 104 is connected to the target equipment.

[0066] The afterburning device is used to perform the coupling function adjustment method provided in this application.

[0067] Optionally, the combustion supplementation device includes a heating device and a storage device; the output end of the steam generating device is connected to the first input end of the heating device; wherein, the first input end of the heating device is the first input end of the combustion supplementation device; the second input end of the heating device is connected to the first output end of the storage device, and the first output end of the heating device is connected to the input end of the power equipment; wherein, the first output end of the heating device is the first output end of the combustion supplementation device.

[0068] A heating device is used to perform the coupling function adjustment method provided in this application. The heating device can be a supplementary combustion boiler.

[0069] Furthermore, in combination Figure 1 See Figure 2 The coupled power supply system provided in this application also includes: a flue gas direct combustion engine 106.

[0070] Specifically, the first input terminal of the flue gas direct combustion engine 106 is connected to the second output terminal of the combustion supplement device 102, and the second input terminal of the flue gas direct combustion engine 106 is connected to the third output terminal of the combustion supplement device 102.

[0071] Optionally, the first input terminal of the flue gas direct combustion engine 106 is connected to the second output terminal of the heating device, and the second input terminal of the flue gas direct combustion engine 106 is connected to the second output terminal of the storage device.

[0072] The second output terminal of the heating device is the second output terminal of the combustion supplement device 102, and the second output terminal of the storage device is the third output terminal of the combustion supplement device 102.

[0073] In a preferred embodiment of this application, the steam generating device 101 can be a waste heat boiler, the power equipment can be a steam turbine, the gasification equipment can be a gasifier, and the gas storage equipment can be a gas storage tank. The selection can be made according to the actual application, and this application embodiment does not limit the choice.

[0074] like Figure 3As shown, the input end of the waste heat boiler receives waste heat, and the output end of the waste heat boiler is connected to the first input end of the supplementary combustion boiler; the input end of the gasifier receives biomass; the output end of the gasifier is connected to the input end of the purification equipment, and the output end of the purification equipment is connected to the input end of the gas storage tank; the output end of the gas storage tank is connected to the second input end of the supplementary combustion boiler, and the first output end of the supplementary combustion boiler is connected to the input end of the steam turbine through a steam pipe; the output end of the steam turbine is connected to the target equipment; the first input end of the flue gas direct combustion engine is connected to the second output end of the supplementary combustion boiler, and the second input end of the flue gas direct combustion engine is connected to the second output end of the gas storage tank.

[0075] See Figure 4 The diagram illustrates a flowchart of a coupling power supply regulation method provided in an embodiment of this application. This coupling power supply regulation method is applied to the coupling power supply system disclosed in the above-described embodiment of this application, and specifically includes the following steps:

[0076] S401: Determine the time delay based on the historical process parameter data of the coupled power supply system.

[0077] In this embodiment, historical process parameter data of the coupled power supply system can be obtained and preprocessed to determine the time delay based on the preprocessed historical process parameter data.

[0078] It should be noted that preprocessing historical process parameter data can include deleting outliers, filling in missing items, and filtering excessively long historical parameter data to make the historical process parameter data more reasonable and smooth.

[0079] Optionally, a preset analysis program can be used to identify the historical waste heat resource temperature and time of the coupled energy supply system, as well as the historical main steam temperature and time of the main steam generated after the historical waste heat resource of the coupled energy supply system enters the steam generation device, from the pre-processed historical process parameter data; the time difference between the historical waste heat resource temperature and time and the historical main steam temperature and time can be calculated to obtain the time delay.

[0080] It should be noted that the historical waste heat resource temperature is the temperature of the historical waste heat resource before it enters the steam generation unit, and the historical main steam temperature is the temperature of the main steam generated by the steam generation unit based on the historical waste heat resource after it enters the steam generation unit. The historical waste heat resource can be historical waste heat.

[0081] It should also be noted that, from Figure 3As can be seen from this, the steam generating device can be a waste heat boiler. That is to say, the historical waste heat resource temperature is the temperature of the historical waste heat resource before it enters the waste heat boiler, and the historical main steam temperature is the temperature of the historical main steam generated by the waste heat boiler based on the historical waste heat resource after it enters the waste heat boiler.

[0082] S402: Utilize current waste heat resources to predict the main steam temperature and flow rate after a time lag; the main steam is generated by the steam generation device using the currently input waste heat.

[0083] In this embodiment, a main steam temperature prediction model and a main steam flow prediction model can be established using the multiple linear regression model.

[0084] As a preferred embodiment of this application, the main steam temperature after a time lag is predicted using a main steam temperature prediction model and current waste heat resources; the main steam flow rate after a time lag is predicted using a main steam flow rate prediction model and current waste heat resources. The current waste heat resources include the current boiler water level, the current waste gas temperature, and the current waste gas flow rate.

[0085] Optionally, the current exhaust gas temperature, current exhaust gas flow rate, and current boiler water level are input into the main steam temperature prediction model; the main steam temperature prediction model uses the current exhaust gas temperature, current exhaust gas flow rate, and current boiler water level to predict the main steam temperature after a time lag. The method of predicting the main steam temperature after a time lag using the main steam temperature prediction model is shown in formula (1).

[0086] (1)

[0087] in, The main steam temperature after the time delay. The current exhaust gas flow rate, h represents the current exhaust gas temperature, and h represents the current boiler water level.

[0088] Optionally, the current exhaust gas temperature, current exhaust gas flow rate, and current boiler water level are input into the main steam flow prediction model; the main steam flow rate after a time lag is predicted using the current exhaust gas temperature, current exhaust gas flow rate, and current boiler water level. The method of predicting the main steam flow rate after a time lag using the main steam flow prediction model is shown in formula (2).

[0089] (2)

[0090] in, The main steam flow rate after the time delay. The current exhaust gas flow rate, h represents the current exhaust gas temperature, and h represents the current boiler water level.

[0091] S403: Based on the main steam temperature after the time delay, the main steam flow rate after the time delay, the current waste heat resources, and the exhaust temperature of the power equipment, predict the system thermal efficiency and system efficiency of the coupled energy supply system.

[0092] In this embodiment, enthalpy analysis is used to analyze the coupled energy supply system according to the first law of thermodynamics, determine the parameters related to the thermal efficiency of the coupled energy supply system, and determine the thermal efficiency prediction model based on the parameters related to thermal efficiency. Among them, the parameters related to thermal efficiency include main steam temperature, main steam flow rate, current waste heat resource amount, and exhaust temperature of power equipment. The current waste heat resource amount is the current exhaust gas temperature. At this time, the thermal efficiency prediction model constructed based on the parameters related to thermal efficiency is as shown in formula (3):

[0093] (3)

[0094] in, The main steam flow rate after the time delay. The main steam temperature after the time delay. The exhaust temperature of the power equipment. For the system's thermal efficiency. From Figure 3 As can be seen from this, the temperature of the power equipment is the exhaust temperature of the steam turbine.

[0095] The second law of thermodynamics was used to analyze the coupled energy supply system using exergy analysis to determine the various parameters related to the thermal efficiency of the coupled functional system. Based on these parameters, a corresponding thermal efficiency prediction model was constructed. The parameters related to thermal efficiency include the main steam temperature, main steam flow rate, current waste heat resource quantity, and exhaust temperature of the power equipment. The current waste heat resource quantity is the current exhaust gas temperature. The thermal efficiency prediction model constructed based on these parameters is shown in formula (4).

[0096] (4)

[0097] in, The main steam flow rate after the time delay. The main steam temperature after the time delay. The exhaust temperature of the power equipment. For system efficiency. From Figure 3 As can be seen from this, the temperature of the power equipment is the exhaust temperature of the steam turbine.

[0098] Optionally, after predicting the main steam temperature and flow rate after the time lag, the exhaust temperature of the power equipment can be further obtained. This allows the main steam temperature after the time lag, the main steam flow rate after the time lag, the current waste heat resource quantity, and the exhaust temperature of the power equipment to be input into the thermal efficiency prediction model to predict the system thermal efficiency of the coupled energy supply system. Similarly, the main steam temperature after the time lag, the main steam flow rate after the time lag, the current waste heat resource quantity, and the exhaust temperature of the power equipment can be input into the efficiency prediction model to predict the system efficiency of the coupled energy supply system. Here, the current waste heat resource quantity is the current exhaust gas temperature.

[0099] S404: Calculate the comprehensive evaluation value based on the system thermal efficiency and system efficiency.

[0100] In the specific execution step S404, after predicting the system thermal efficiency and system efficiency, the average value of the system thermal efficiency and system efficiency is calculated, and the average value is used as the comprehensive evaluation value of the coupled energy supply system.

[0101] S405: Using the main steam temperature and the main steam flow rate as constraints, and with the comprehensive evaluation value as the maximum objective, solve for the standard main steam temperature and standard main steam flow rate after the time delay.

[0102] Optionally, a comprehensive evaluation value optimization model can be established with the maximum comprehensive evaluation value as the standard and the main steam temperature and main steam flow rate limits as constraints. The comprehensive evaluation value optimization model can be solved using the particle swarm optimization algorithm to obtain the dynamic optimization setpoints of the main steam temperature and main steam flow rate after the time delay. The dynamic optimization setpoints of the main steam temperature and main steam flow rate after the time delay are then used as the standard main steam temperature and the dynamic optimization setpoints of the main steam flow rate after the time delay, respectively.

[0103] In this embodiment, the comprehensive evaluation value optimization model is established with the maximum comprehensive evaluation value as the standard and the main steam temperature and main steam flow rate as constraints, as shown in formula (5).

[0104] (5)

[0105] in, The minimum value of the preset main steam temperature. The maximum value of the preset main steam temperature; The minimum value of the pre-set main steam flow rate, The maximum value of the main steam flow rate is preset.

[0106] The coupled power supply regulation method provided in this application analyzes the time delay of the coupled power supply system to predict the main steam temperature and flow rate after the time delay based on the current waste heat resources. Based on the current waste heat resources and the predicted main steam temperature and flow rate after the time delay, the method predicts the system thermal efficiency and system efficiency of the coupled power supply system. Finally, with the main steam temperature and flow rate as constraints and the comprehensive evaluation value as the maximum objective, the standard main steam temperature and flow rate after the time delay are obtained. This method not only fully considers the long time that occurs between the waste heat resources entering the waste heat power generation system and the utilization of waste heat resources for power generation, and the large time delay characteristic of the cement clinker production process, but also combines system thermal efficiency and system efficiency. That is, it focuses not only on the efficiency of "quantity" conversion but also on the efficiency of "quality" conversion, thereby improving the accuracy of the standard values ​​of the main steam temperature and flow rate, and thus solving the problem of unstable generator power output.

[0107] Furthermore, based on the coupled energy supply regulation method provided in the above embodiments of this application, this application can also implement coupled energy supply strategies under different conditions for the actual main steam parameters after the time lag, according to the standard main steam temperature and standard main steam flow rate after the time lag. The specific process is as follows:

[0108] The actual main steam flow rate and actual main steam temperature are obtained after the time delay; wherein the steam generating device utilizes actual waste heat resources. It is determined whether the actual main steam flow rate is equal to the standard main steam flow rate and whether the actual main steam temperature is equal to the standard main steam temperature; if the actual main steam flow rate is less than the standard main steam flow rate and the main steam temperature is less than the standard main steam temperature, the combustion device uses a gas-fired water pump to supply water at room temperature to generate steam at a first preset temperature, so that the steam flow rate and the main steam flow rate both reach the standard main steam flow rate, and the steam temperature and the main steam temperature both reach the standard main steam temperature; the power equipment uses the steam and the actual main steam to drive a generator to generate electricity. The first preset temperature is calculated as: First preset temperature = (Standard main steam heat - Actual main steam heat) / (Specific heat capacity * (Standard main steam flow rate - Actual main steam flow rate)).

[0109] If the actual main steam flow rate is less than the standard main steam flow rate, but the actual main steam temperature is greater than the standard main steam temperature, the gas-fired heating water pump is used by the combustion supplement device to generate steam at the second preset temperature, so that the steam flow rate and the actual main steam flow rate both reach the standard main steam flow rate, and the steam temperature and the actual main steam temperature both reach the standard main steam temperature. The steam and the actual main steam then drive a generator to produce electricity. The second preset temperature is less than the first preset temperature. The second preset temperature is calculated as follows: Second preset temperature = (Standard main steam heat - Actual main steam heat) / (Specific heat capacity * (Standard main steam flow rate - Actual main steam flow rate)).

[0110] If the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is less than the standard main steam temperature, the actual main steam is heated to the standard main steam temperature; the heated actual main steam is then used by a power equipment to drive a generator to generate electricity.

[0111] If the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is equal to the standard main steam temperature, the actual main steam will be used to drive the generator to generate electricity through the power equipment.

[0112] If the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is greater than the standard main steam temperature, open the desuperheating water valve until the actual main steam temperature and the actual main steam flow rate are equal to the standard main steam flow rate. Then, use the actual main steam with the actual main steam temperature and flow rate equal to the standard main steam flow rate to drive the generator to generate electricity.

[0113] If the actual main steam flow rate is greater than the standard main steam flow rate, regardless of whether the actual main steam temperature is less than, equal to, or greater than the standard main steam temperature, the exhaust valve is opened after a time delay until the actual main steam flow rate equals the standard main steam flow rate. If the actual main steam temperature is less than the standard steam temperature, the actual main steam is heated to the standard main steam temperature. If the actual main steam temperature is greater than the standard steam temperature, the desuperheating water valve is opened until the actual main steam temperature equals the standard main steam temperature. The generator is then driven by the actual main steam with both the actual main steam temperature and flow rate equal to the standard main steam flow rate to generate electricity.

[0114] As a preferred embodiment of this application, Figure 3For example, the steam generation device can be a waste heat boiler, the power equipment can be a steam turbine, and the combustion device includes a combustion boiler, a gasifier, purification equipment, and a gas storage tank. Waste heat resources are input into the waste heat boiler so that it can generate the corresponding main steam. Simultaneously, biomass is fed into the gasifier so that it can be gasified to obtain fuel gas, which is then purified and stored in the gas storage tank.

[0115] When the supplementary combustion boiler detects that the waste heat boiler is outputting actual main steam, it determines whether the actual main steam flow rate is equal to the standard main steam flow rate and whether the actual main steam temperature is equal to the standard main steam temperature.

[0116] If the actual main steam flow rate is less than the standard main steam flow rate and the actual main steam temperature is less than the standard main steam temperature, the supplementary combustion boiler can switch to parallel operation mode after a time delay. This means that the ambient temperature feedwater pump valve is opened, and the pump outputs ambient temperature feedwater at a preset flow rate. A portion of the feedwater heated by the gas from the gas storage tank is drawn to the ambient temperature feedwater at the first preset temperature, ensuring that both the steam flow rate and the actual main steam flow rate reach the standard main steam flow rate, and both the steam temperature and the actual main steam temperature reach the standard main steam temperature. The steam and the actual main steam are then fed into the steam turbine through steam pipelines, and the steam turbine uses the steam and the actual main steam to drive the generator to produce electricity. The preset flow rate is the difference between the main steam flow rate and the standard main steam flow rate.

[0117] If the actual main steam flow rate is less than the standard main steam flow rate, but the actual main steam temperature is greater than the standard main steam temperature, the system can switch to parallel operation mode after a time delay. In other words, the auxiliary combustion boiler opens the valve of the ambient temperature feedwater pump, outputs ambient temperature feedwater at a preset flow rate, and draws part of the ambient temperature feedwater from the gas storage tank heated by the gas to the second preset temperature. This ensures that the steam flow rate and the actual main steam flow rate both reach the standard main steam flow rate, and that the steam temperature and the actual main steam temperature both reach the standard main steam temperature. The steam and the actual main steam are then fed into the steam turbine through the steam pipeline, and the steam turbine uses the steam and the actual main steam to drive the generator to generate electricity.

[0118] If the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is less than the standard main steam temperature, the auxiliary combustion boiler draws some gas from the gas storage tank to heat the actual main steam to the standard main steam temperature. The heated actual main steam is then fed into the steam turbine through the steam pipeline, and the steam turbine uses the heated actual main steam to drive the generator to generate electricity.

[0119] If the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is equal to the standard main steam temperature, the supplementary combustion boiler can be controlled to switch to series function mode after a time delay. That is, the actual main steam is input into the steam turbine through the steam pipeline, and the steam turbine uses the actual main steam to drive the generator to generate electricity.

[0120] If the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is greater than the standard main steam temperature, the waste heat boiler is controlled to open the desuperheating water valve until the main steam temperature and the main steam flow rate are equal to the standard main steam temperature and the standard main steam flow rate. The actual main steam with the actual main steam temperature and the actual main steam flow rate are equal to the standard main steam temperature and the standard main steam flow rate are then fed into the steam turbine through the steam pipeline. The steam turbine uses the actual main steam with the actual main steam temperature and the actual main steam flow rate to drive the generator to generate electricity.

[0121] If the actual main steam flow rate is greater than the standard main steam flow rate, regardless of whether the actual main steam temperature is less than, equal to, or greater than the standard main steam temperature, the exhaust valve is opened after a time delay until the main steam flow rate equals the standard main steam flow rate. If the actual main steam temperature is less than the standard steam temperature, the actual main steam is heated to the standard main steam temperature. If the actual main steam temperature is greater than the standard steam temperature, the desuperheating water valve is opened until the actual main steam temperature equals the standard main steam temperature. The actual main steam with the same temperature and flow rate is then fed into the steam turbine through the steam pipeline. The steam turbine uses the actual main steam with the same temperature and flow rate to drive the generator to generate electricity.

[0122] Furthermore, in this embodiment, the actual main steam generated by the waste heat boiler will produce corresponding flue gas after entering the supplementary combustion boiler. The flue gas generated can then be drawn from the gas storage tank by the flue gas direct combustion engine and converted into flue gas through the gas pipeline. The flue gas direct combustion engine can then use the input flue gas to cool or heat the plant area.

[0123] Similar or identical parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0124] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0125] The features described above regarding the disclosed embodiments can be substituted for or combined with each other to enable those skilled in the art to implement or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of coupled energy supply regulation, characterized in that The method is applied to a coupled energy supply system, the coupled energy supply system at least comprising a steam generation device, a supplementary combustion device connected with the steam generation device, and a power equipment connected with the supplementary combustion device, and the method comprises: determining a time lag time according to historical process parameter data of the coupled energy supply system; predicting a main steam temperature and a main steam flow rate of the main steam after the time lag time by using current waste heat resources; the main steam is generated by the steam generation device by using the current waste heat resources; predicting a system thermal efficiency and a system exergy efficiency of the coupled energy supply system according to the main steam temperature after the time lag time, the main steam flow rate after the time lag time, the current waste heat resources, and a power equipment exhaust temperature; calculating an integrated evaluation value according to the system thermal efficiency and the system exergy efficiency; solving a standard main steam temperature and a standard main steam flow rate after the time lag time by taking the main steam temperature and the main steam flow rate as constraints and taking the integrated evaluation value as a maximum target.

2. The method of claim 1, wherein, The method further comprises: obtaining an actual main steam flow rate and an actual main steam temperature after the time lag time; wherein the steam generation device generates by using actual waste heat resources; if the actual main steam flow rate is less than the standard main steam flow rate and the actual main steam temperature is less than the standard main steam temperature, generating steam by heating water pump normal temperature feed water to a first preset temperature by the supplementary combustion device, so that the steam flow rate of the steam and the main steam flow rate together reach the standard main steam flow rate, and the steam temperature of the steam and the main steam temperature together reach the standard main steam temperature.

3. The method of claim 2, wherein, The method further comprises: if the main steam flow rate is less than the standard main steam flow rate and the actual main steam temperature is greater than the standard main steam temperature, generating steam by heating water pump normal temperature feed water to a second preset temperature by the supplementary combustion device, so that the steam flow rate of the steam and the main steam flow rate together reach the standard main steam flow rate, and the steam temperature of the steam and the main steam temperature together reach the standard main steam temperature; wherein the second preset temperature is less than the first preset temperature; generating electricity by the power equipment by using the steam and the main steam to drive a generator.

4. The method of claim 2, wherein, The method further comprises: if the actual main steam flow rate is equal to the standard main steam flow rate and the actual main steam temperature is less than the standard main steam temperature, heating the main steam to the standard main steam temperature; generating electricity by the power equipment by using the heated main steam to drive a generator.

5. The method of claim 1, wherein, The method of determining a time lag time according to historical process parameter data of the coupled energy supply system comprises: obtaining historical process parameter data of the coupled energy supply system and pre-processing the historical process parameter data; identifying, by using a preset analysis program, a historical waste heat resource temperature time of the coupled energy supply system and a historical main steam temperature time of the main steam generated after the historical waste heat resources of the coupled energy supply system enter the steam generation device from the pre-processed historical process parameter data; Calculate the time difference between the historical waste heat resource temperature time and the historical main steam temperature time, and obtain the time lag time.

6. The method of claim 1, wherein, The main steam temperature and the main steam flow of the main steam after the time lag time are predicted by using the current waste heat resource, including: Obtain the current waste heat resource of the coupled energy supply system; Predict the main steam temperature of the main steam after the time lag time by the main steam temperature prediction model and the current waste heat resource; Predict the main steam flow of the main steam after the time lag time by the main steam flow prediction model and the current waste heat resource.

7. The method of claim 6, wherein, The current waste heat resource includes the current boiler water level, the current exhaust gas temperature and the current exhaust gas flow of the exhaust gas, and the main steam temperature of the main steam after the time lag time is predicted by the main steam temperature prediction model and the current waste heat resource, including: Input the current exhaust gas temperature, the current exhaust gas flow and the current boiler water level into the main steam temperature prediction model; The main steam temperature of the main steam after the time lag time is predicted by the main steam temperature prediction model by using the current exhaust gas temperature, the current exhaust gas flow and the current boiler water level.

8. The method of claim 7, wherein, The main steam flow of the main steam after the time lag time is predicted by the main steam flow prediction model and the current waste heat resource, including: Input the current exhaust gas temperature, the current exhaust gas flow and the current boiler water level into the main steam flow prediction model; The main steam flow of the main steam after the time lag time is predicted by the main steam flow prediction model by using the current exhaust gas temperature, the current exhaust gas flow and the current boiler water level.

9. The method of claim 1, wherein, The system thermal efficiency and the system exergy efficiency of the coupled energy supply system are predicted according to the main steam temperature after the time lag time, the main steam flow after the time lag time, the current waste heat resource and the power plant exhaust temperature, including: Input the main steam temperature after the time lag time, the main steam flow after the time lag time, the current waste heat resource and the power plant exhaust temperature into the thermal efficiency prediction model to predict the system thermal efficiency of the coupled energy supply system; Input the main steam temperature, the main steam flow, the current waste heat resource and the power plant exhaust temperature into the exergy efficiency prediction model to predict the system exergy efficiency of the coupled energy supply system.

10. A coupled power supply system, characterized by, It includes: A steam generating device, a supplemental combustion device, a power plant and a generator; The input end of the steam generating device receives waste heat, and the output end of the steam generating device is connected with the first input end of the supplemental combustion device; The second input end of the supplemental combustion device receives biomass, the first output end of the supplemental combustion device is connected with the input end of the power plant, and the output end of the power plant is connected with the input end of the generator; The output end of the generator is connected with a target device; The supplemental combustion device is used to perform the coupled energy supply adjustment method according to any one of claims 1-9.

11. The coupled power supply system of claim 10, wherein, The supplemental combustion device includes a heating device and a storage device; The output end of the steam generating device is connected with the first input end of the heating device; wherein the first input end of the heating device is the first input end of the supplemental combustion device; The supplemental combustion device includes a heating device and a storage device; The second input end of the heating device is connected with the first output end of the storage device, and the first output end of the heating device is connected with the input end of the power equipment; wherein the first output end of the heating device is the first output end of the supplementary combustion device; The heating device is used for executing the coupling energy supply adjustment method according to any one of claims 1-9.

12. The coupled power supply system of claim 10, wherein, Further comprising: A flue gas direct combustion machine; The first input end of the flue gas direct combustion machine is connected with the second output end of the supplementary combustion device, and the second input end of the flue gas direct combustion machine is connected with the third output end of the supplementary combustion device.

13. The coupled power supply system of claim 12, wherein, The supplementary combustion device comprises a heating device and a storage device; The first input end of the flue gas direct combustion machine is connected with the second output end of the heating device, and the second input end of the flue gas direct combustion machine is connected with the second output end of the storage device; Wherein the second output end of the heating device is the second output end of the supplementary combustion device, and the second output end of the storage device is the third output end of the supplementary combustion device.

14. The coupled power supply system of claim 11 or 13, wherein, The storage device comprises a gasification equipment, a purification equipment and a gas storage equipment; The input end of the gasification equipment receives biomass, and the output end of the gasification equipment is connected with the input end of the purification equipment; wherein the input end of the gasification equipment is the second input end of the supplementary combustion device; The output end of the purification equipment is connected with the input end of the gas storage equipment, and the first output end of the gas storage equipment is connected with the second input end of the heating device; wherein the first output end of the gas storage equipment is the first output end of the storage device.

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