Method and system for utilizing waste heat of coupling fuzzy control, ORC (organic Rankine cycle) and Carnot cell

Abstract

The invention provides a coupling fuzzy control, ORC (Organic Rankine Cycle) and Carnot cell waste heat utilization method and system, which combines a fuzzy T-S model, an ORC and Carnot cell coupling system, and excites an ORC waste heat generator set by using a pseudo-random signal modulated based on a fuzzy model. The implementation process of flue gas waste heat utilization and Carnot cell compensation is monitored, regulated and controlled in real time, the adaptability limitation of a traditional static model on the time-varying characteristic of waste heat parameters is broken through, and coordinated control over multi-level gradient utilization of industrial waste heat and stored energy release is achieved. And the flexibility, the energy efficiency level and the new energy friendly access capability of the energy system are improved. According to the method, a multi-energy-flow collaborative optimization mechanism is constructed based on the fuzzy T-S dynamic clustering algorithm, the flue gas waste heat recovery rate is increased, the waste heat resource gradient utilization efficiency and the energy system operation flexibility are remarkably improved, and an efficient solution is provided for low-temperature waste heat deep recovery in the iron and steel industry.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of industrial waste heat recovery and energy storage, and particularly relates to a waste heat utilization method and system coupling fuzzy control, ORC and Carnot cell. BACKGROUND

[0002] A large amount of low-temperature industrial waste heat (80℃-350℃) is generated in the processes of sintering, iron smelting and steel rolling in the steel manufacturing process. At present, most of the waste heat is not efficiently recovered, resulting in huge energy waste and carbon emission problems. As a power generation technology suitable for low-temperature heat sources, the organic Rankine cycle (ORC) has been widely used in industrial waste heat utilization scenarios. However, the ORC system is difficult to adapt to the time-varying nature of the flue gas parameters, and a considerable part of the waste heat cannot be fully recovered and utilized. The system has weak regulation ability, poor energy utilization timeliness and other problems.

[0003] The Carnot cell is a new type of energy storage system based on the principles of heat pump + heat storage + heat engine. It can convert electrical energy or low-grade heat energy into high-temperature heat energy and store it in a heat storage device. When needed, it can be converted into electrical energy output through a heat engine. The system has the ability of cross-period, large-capacity energy storage and rapid load response.

[0004] However, the existing traditional control method is based on the traditional fixed mechanism model, which regards the ORC and the Carnot cell as independent subsystems. It lacks coordination mechanism for the response characteristics of the ORC and the heat storage period of the Carnot cell, and ignores the nonlinearity of multivariable parameters, resulting in low comprehensive efficiency, poor stability and other problems of the system.

[0005] The existing scheme one establishes an economic analysis model linking peak-valley electricity price and natural gas price, establishes an optimal planning and operation control optimization framework for equipment, and completes the capacity configuration and operation state regulation and control of the waste heat recovery equipment based on static parameters. However, this scheme still has significant limitations in practical application: the optimization model does not fully consider the dynamic fluctuation characteristics of flue gas temperature, flow and other parameters in the steel production process, resulting in insufficient dynamic response capability of the system in response to different working conditions of the steel plant, such as equipment regulation lag, low-temperature waste heat recovery rate, and other problems, which restricts the energy cascade utilization efficiency and system control flexibility.

[0006] The second existing scheme forms flue gas above 100 DEG C by preheating boiler feed water through the coal economizer after the flue gas at the outlet of the waste heat boiler, and recovers the low-temperature flue gas waste heat of the circular cooler at 150-200 DEG C by mixing the circulating flue gas with cooling air. However, the scheme has structural defects: the air leakage problem between the upper air collecting hood of the circular cooler and the trolley forces the system to supplement excessive cooling air, leading to uneven mixing of cold and hot inlet flue gas, fluctuation of outlet flue gas quality, and reduction of waste heat boiler power generation efficiency; at the same time, the system does not consider the influence of dynamic fluctuations of flue gas temperature and flow on the stability of the heat cycle, and the low-grade waste heat of the flue gas at the outlet of the evaporator with a temperature below 85.3 DEG C cannot be effectively utilized, restricting the deep recovery potential of waste heat resources.

[0007] The third existing scheme converts industrial waste heat into high-quality heat energy by driving the compressor during off-peak electricity periods, stores the heat energy through the cascade heat storage module (medium-high temperature phase change latent heat unit + high pressure water sensible heat unit), and releases the energy through the organic Rankine cycle during peak electricity periods to generate electricity, realizing waste heat recovery and grid peak shaving. However, the control strategy focuses on static economic optimization and does not fully consider the nonlinear coupling relationship between industrial waste heat temperature fluctuations and the dynamic characteristics of the Carnot battery energy storage and release, leading to lag in thermal and electrical decoupling response and limited multi-energy flow coordination efficiency in actual operation, making it difficult to adapt to the fine regulation and control requirements under the time-varying scene of steel plant flue gas parameters.

[0008] In summary, the existing deep utilization technology of waste heat has not yet had a scheme coupling fuzzy T-S control, organic Rankine cycle and Carnot battery. SUMMARY

[0009] The technical problem to be solved by the present application is to provide a waste heat utilization method and system coupling fuzzy control, ORC and Carnot battery, for real-time monitoring and regulation of the implementation process of flue gas waste heat utilization and Carnot battery compensation.

[0010] The technical solution adopted by the present application to solve the above technical problems is: a waste heat utilization method coupling fuzzy control, ORC and Carnot battery, comprising the following steps: S1: assembling a waste heat utilization system coupling fuzzy control, ORC and Carnot battery, including a multi-output ORC system composed of controlled regulating valves and working fluid processing units; S2: decomposing the parameters of the multi-output ORC system into fuzzy rules of a multi-input single-output system; S3: setting the output of the fuzzy rule as a modulated pseudo-random signal, and using it as a dynamic disturbance excitation source to perform parameter excitation on the ORC system; based on the excitation result, dynamically adjusting the controlled parameters.

[0011] According to the scheme, in the step S1, the controlled regulating valve comprises a three-way regulating valve, a four-way regulating valve and a solenoid valve; the working medium processing unit comprises a low-temperature flue gas chimney, a waste heat exchanger, an expander, a condenser, a working medium pump, a working medium storage tank, a high-temperature heat accumulator, a low-temperature heat accumulator, a compressor, a cooling tower, a water pump, a cooling control valve and a liquid storage tank; the condenser, the cooling tower, the water pump, the cooling control valve and the liquid storage tank form a cooling cycle.

[0012] According to the scheme, in the step S2, the fuzzy rule is: if an input vector of the fuzzy rule is within a clustering radius of a data clustering center, then an output of the fuzzy rule is equal to a sum of a static output, a product of a transpose of a dynamic parameter vector to be identified and the input vector, and a static compensation parameter of a Carnot cell.

[0013] Further, in the step S2, if a certain input vector of the fuzzy rule belongs to a certain cluster, then the static output is corrected by actual outputs corresponding to all input vectors of the fuzzy rule.

[0014] Further, in the step S2, a nonlinear output is obtained by weighting and averaging the outputs of the fuzzy rules according to membership functions of the fuzzy rules; the membership functions of the fuzzy rules are obtained by distances between the input vector and each clustering center.

[0015] According to the scheme, in the step S3, the parameters comprise an expander inlet regulating valve opening, a working medium pump rotating speed, a flue gas mass flow regulating valve opening and a Carnot cell loop working medium heat exchange cycle flow rate.

[0016] According to the scheme, in the step S3, the specific steps are as follows: S31: when the pseudo-random signal satisfies the ORC system alone running condition, the working medium is sent into the expander to generate electricity through the waste heat exchanger, and then the working medium is cooled by the condenser and sent into the working medium storage tank through the working medium pump; S32: when the pseudo-random signal satisfies the Carnot cell alone running condition, the low-temperature flue gas waste heat is adjusted according to the pseudo-random signal; S33: when the pseudo-random signal satisfies the ORC system and Carnot cell running condition, the Carnot cell low-temperature heat accumulator condition or the Carnot cell high-temperature heat accumulator condition is adjusted according to the pseudo-random signal.

[0017] Further, in the step S32, the specific steps are as follows: S321: when the low-temperature flue gas waste heat satisfies the low-temperature heat accumulator storage regulation pseudo-random signal, the working medium is exchanged by the waste heat exchanger, then exchanged by the low-temperature heat accumulator, and then sent into the working medium storage tank; S322: When the low-temperature flue gas waste heat cannot meet the low-temperature heat accumulator storage regulation pseudo-random signal, the working medium is sent into a compressor for compression, then expanded heat exchange through a high-temperature heat accumulator, and then sent into the low-temperature heat accumulator for further heat exchange, and then sent into a working medium storage tank; S323: When the low-temperature flue gas waste heat meets the high-temperature heat accumulator storage regulation pseudo-random signal, the working medium is sent into a waste heat exchanger, a high-temperature heat accumulator and a low-temperature heat accumulator in sequence for heat exchange, and then sent into a working medium storage tank.

[0018] Further, in the step S33, the specific steps are as follows: S331: When the pseudo-random signal meets the ORC system and the low-temperature heat accumulator of the Carnot cell, the working medium is sent into a waste heat exchanger for heat exchange, then divided into two parts according to the pseudo-random signal, one part is sent into an expander for power generation, then sent into a working medium storage tank through a condenser and a working medium pump; the other part is sent into the working medium storage tank through a low-temperature heat accumulator. S332: When the pseudo-random signal meets the ORC system and the high-temperature heat accumulator of the Carnot cell, the working medium is sent into a waste heat exchanger for heat exchange, then divided into two parts according to the pseudo-random signal, one part is sent into an expander for power generation, then sent into a working medium storage tank through a condenser and a working medium pump; the other part is sent into the working medium storage tank through a high-temperature heat accumulator and a low-temperature heat accumulator.

[0019] The waste heat utilization system coupled with fuzzy control, ORC and Carnot cell, The system establishment submodule is used for establishing the waste heat utilization system coupled with fuzzy control, ORC and Carnot cell, and includes a multi-output ORC system composed of a controlled regulating valve and a working medium processing unit; The parameter decomposition submodule is used for decomposing parameters of the multi-output ORC system into fuzzy rules of a multi-input single-output system. The excitation adjustment submodule is used for setting the output of the fuzzy rule as a modulated pseudo-random signal, and using the pseudo-random signal as a dynamic disturbance excitation source to perform parameter excitation on the ORC system; and based on the excitation result, performing dynamic adjustment on the controlled parameters.

[0020] The present application has the following advantages: 1.The method and system for coupling fuzzy control, ORC and waste heat utilization of Carnot cell according to the present application, aiming at the problem that a large amount of low-temperature flue gas waste heat generated in the sintering, ironmaking and steel rolling processes of the existing steel manufacturing process cannot be effectively utilized, combines the fuzzy Takagi-Sugeno (T-S) model with the organic Rankine cycle (ORC) and Carnot cell coupling system, uses the pseudo-random signal modulated based on the fuzzy model to excite the ORC waste heat generator set, realizes real-time monitoring and regulation of the flue gas waste heat utilization and Carnot cell compensation implementation process, breaks through the adaptability limitation of the traditional static model to the time-varying characteristics of waste heat parameters, realizes the coordinated control of multi-level cascade utilization of industrial waste heat and energy storage and release, and improves the flexibility, energy efficiency and new energy friendly access capability of the energy system.

[0021] 2.The present application constructs a multi-energy flow collaborative optimization mechanism based on the fuzzy T-S dynamic clustering algorithm, improves the flue gas waste heat recovery rate, and significantly improves the cascade utilization efficiency of waste heat resources and the flexibility of the energy system, providing an efficient solution for deep recovery of low-temperature waste heat in the steel industry.

[0022] 3.The present application combines the Carnot cell with the ORC system, dynamically excites the ORC unit through the pseudo-random signal modulated by the T-S fuzzy control, constructs a multi-energy flow collaborative optimization mechanism, and effectively solves the technical problems of poor adaptability of the steel plant waste heat recovery system to the time-varying characteristics of flue gas parameters and low energy storage and release efficiency.

[0023] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 is a flow chart of an embodiment of the present application.

[0026] Figure 2 is a system composition diagram of an embodiment of the present application.

[0027] In the figure: 1. Low-temperature flue gas; 2. Waste heat exchanger; 4. Expander; 5. Condenser; 6. Working medium pump; 7. Working medium storage tank; 8. Solenoid valve; 9. High-temperature thermal storage; 10. Low-temperature thermal storage; 11. Four-way regulating valve; 12. Compressor; 13. Cooling tower; 14. Water pump; 15. Cooling control valve; 16. Liquid storage tank; 301. First solenoid three-way regulating valve; 302. Second solenoid three-way regulating valve; 303. Third solenoid three-way regulating valve; 304. Fourth solenoid three-way regulating valve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0029] Example 1 Referring to Figure 1 , the specific steps of the waste heat utilization method coupling fuzzy control, ORC and Carnot cell are as follows: S1: Assembling a waste heat utilization system coupling fuzzy control, ORC and Carnot cell, including a multi-output ORC system composed of controlled regulating valves and working medium processing units; S2: Decomposing the parameters of the multi-output ORC system into fuzzy rules of a multi-input single-output system; S3: Setting the output of the fuzzy rules as a modulated pseudo-random signal and using it as a dynamic disturbance excitation source to perform parameter excitation on the ORC system; and based on the excitation results, performing dynamic adjustment on the controlled parameters.

[0030] Further, in step S1, the controlled regulating valves include three-way regulating valves, four-way regulating valves and solenoid valves; the working medium processing units include a low-temperature flue gas, a waste heat exchanger, an expander, a condenser, a working medium pump, a working medium storage tank, a high-temperature thermal storage, a low-temperature thermal storage, a compressor, a cooling tower, a water pump, a cooling control valve and a liquid storage tank; the condenser, the cooling tower, the water pump, the cooling control valve and the liquid storage tank form a cooling cycle.

[0031] In step S2, the fuzzy rule is: if the input vector of the fuzzy rule is within the clustering radius of a certain data clustering center, then the output of the fuzzy rule is equal to the sum of the static output, the transpose of the dynamic parameter vector to be identified and the product of the input vector, and the static compensation parameter of the Carnot cell.

[0032] Further, in step S2, if a certain input vector of the fuzzy rule belongs to a certain cluster, then the static output is corrected through the actual output corresponding to all input vectors of the fuzzy rule.

[0033] Further, in step S2, the nonlinear output is obtained by weighting the outputs of the fuzzy rules according to the membership functions of the fuzzy rules and averaging the weighted outputs; and the membership functions of the fuzzy rules are obtained by the distances between the input vector and the cluster centers.

[0034] In step S3, the parameters include the opening degree of the inlet regulating valve of the expander, the rotating speed of the working medium pump, the opening degree of the flue gas mass flow regulating valve, and the flow speed of the working medium in the heat exchange cycle of the Carnot cell loop.

[0035] In step S3, the specific steps are as follows: S31: When the pseudo-random signal meets the condition of the ORC system running alone, the working medium is sent into the expander to generate electricity through the waste heat exchanger, and then the working medium is cooled through the condenser and sent into the working medium storage tank through the working medium pump; S32: When the pseudo-random signal meets the condition of the Carnot cell running alone, the low-temperature flue gas waste heat is adjusted according to the pseudo-random signal; S33: When the pseudo-random signal meets the condition of the ORC system and the Carnot cell running, the Carnot cell low-temperature heat accumulator condition or the Carnot cell high-temperature heat accumulator condition is adjusted according to the pseudo-random signal.

[0036] Further, in step S32, the specific steps are as follows: S321: When the low-temperature flue gas waste heat meets the low-temperature heat accumulator storage control pseudo-random signal, the working medium is exchanged through the waste heat exchanger, and then exchanged through the low-temperature heat accumulator and sent into the working medium storage tank; S322: When the low-temperature flue gas waste heat cannot meet the low-temperature heat accumulator storage control pseudo-random signal, the working medium is compressed through the compressor, then expanded and exchanged through the high-temperature heat accumulator, further exchanged through the low-temperature heat accumulator, and then sent into the working medium storage tank; S323: When the low-temperature flue gas waste heat meets the high-temperature heat accumulator storage control pseudo-random signal, the working medium is exchanged through the waste heat exchanger, the high-temperature heat accumulator, and the low-temperature heat accumulator in sequence, and then sent into the working medium storage tank.

[0037] Further, in step S33, the specific steps are as follows: S331: When the pseudo-random signal meets the condition of the ORC system and the Carnot cell low-temperature heat accumulator, the working medium is exchanged through the waste heat exchanger, and then divided into two parts according to the pseudo-random signal, one part is sent into the expander to generate electricity, then sent into the working medium storage tank through the condenser and the working medium pump; the other part is exchanged through the low-temperature heat accumulator and then sent into the working medium storage tank; S332: When the pseudo-random signal satisfies the conditions of the ORC system and the high-temperature heat storage device of the Carnot battery, the working fluid is sent to the waste heat exchanger for heat exchange, and then divided into two parts according to the pseudo-random signal. One part is sent to the expander for power generation, and then sent to the working fluid storage tank through the condenser and the working fluid pump. The other part is sent to the working fluid storage tank after heat exchange in the high-temperature heat storage device and then further used for waste heat in the low-temperature heat storage device.

[0038] This embodiment addresses the problem of ineffective utilization of large amounts of medium- and low-temperature flue gas waste heat generated in multiple stages of existing steel manufacturing processes, such as sintering, ironmaking, and rolling. It combines a fuzzy Takagi-Sugeno (TS) model with an organic Rankine cycle (ORC) and Carnot battery coupling system. By using pseudo-random signals modulated based on the fuzzy model to excite the ORC waste heat generator unit, it achieves real-time monitoring and control of the flue gas waste heat utilization and Carnot battery compensation process. This overcomes the limitations of traditional static models in adapting to the time-varying characteristics of waste heat parameters, realizes multi-level cascade utilization of industrial waste heat and coordinated control of energy storage and release, and improves the flexibility, energy efficiency, and renewable energy integration capabilities of the energy system.

[0039] Example 2 The steps in this embodiment are the same as in Embodiment 1, except that each step is applied to a specific instance. Specifically, it includes the following steps: S1: Construct a waste heat utilization system that combines coupled fuzzy control, ORC, and Carnot battery, including a multi-output ORC system composed of a controlled regulating valve and a working fluid processing unit; The working fluid processing units are connected by controlled regulating valves, which include a solenoid three-way regulating valve, a solenoid valve 8 and a four-way regulating valve 11; the solenoid three-way regulating valve includes a first solenoid three-way regulating valve 301, a second solenoid three-way regulating valve 302, a third solenoid three-way regulating valve 303 and a fourth solenoid three-way regulating valve 304. The working fluid treatment unit includes a low-temperature flue gas duct 1, a waste heat exchanger 2, an expander 4, a condenser 5, a working fluid pump 6, a working fluid storage tank 7, a high-temperature heat storage tank 9, a low-temperature heat storage tank 10, a compressor 12, a cooling tower 13, a water pump 14, a cooling control valve 15, and a liquid storage tank 16; the condenser 5, cooling tower 13, water pump 14, cooling control valve 15, and liquid storage tank 16 form a cooling cycle; S2: Decompose the parameters of a multi-output ORC system into fuzzy rules for a multi-input single-output system; the N fuzzy rule equations of the ORC system are expressed as follows:

[0040] in It is the first There are 1 control rule, where N is the number of fuzzy rules. It is a combination of input vectors for fuzzy rules. It is the first Each data cluster center and its corresponding cluster radius; It is the first The output of the rule, It is the first The static output of the rule, B is the dynamic parameter vector to be identified. i These are the static compensation parameters for the Carnot battery.

[0041] Static output is specifically expressed as:

[0042] The static output of all rules is then integrated, and a non-linear output is obtained by aggregating membership weights, specifically as follows:

[0043] No. Membership function of a rule It is obtained from the distance between the input vector and each cluster center.

[0044] S3: Set the nonlinear output y as a modulated pseudo-random signal, and use the modulated pseudo-random sequence as a dynamic disturbance excitation source. Perform parameter excitation on the ORC waste heat generator unit through the pseudo-random signal; dynamically adjust the controlled parameters based on the excitation results. The parameters include the opening degree of the expander inlet regulating valve, the working fluid pump speed, the opening degree of the flue gas mass flow regulating valve, and the working fluid heat exchange circulation velocity in the Carnot battery loop. The specific steps are as follows: S31: When the pseudo-random signal y satisfies the conditions for the ORC system to operate alone, its specific operation is as follows: The working fluid is sent to the first electromagnetic three-way regulating valve 301 via the waste heat exchanger 2, and then to the expander 4 via the first electromagnetic three-way regulating valve 302 and the second electromagnetic three-way regulating valve 303. After the expander 4 performs work and outputs electricity through the generator, the working fluid is cooled by the condenser 5 and then sent to the working fluid storage tank 7 via the working fluid pump 6.

[0045] S32: When the pseudo-random signal y satisfies the conditions for Carnot battery operation alone, its specific operation is as follows: S321: When the waste heat from the low-temperature flue gas in the steel plant has a false signal y for storage and regulation of the low-temperature heat storage device, the working medium is sent to the waste heat exchanger 2 through the first electromagnetic three-way regulating valve 301, and then to the four-way regulating valve 11 through the second electromagnetic three-way regulating valve 302. After passing through the four-way regulating valve, it is sent to the low-temperature heat storage device 10. After heat exchange in the low-temperature heat storage device 10, it is sent to the working medium storage tank 7 through the electromagnetic valve 8. S322: When the low-temperature flue gas waste heat in the steel plant cannot meet the low-temperature heat accumulator storage control pseudo signal y, the working medium is sent into the four-way regulating valve 11 through the first electromagnetic three-way regulating valve 301, then into the compressor 12, and after being compressed by the compressor 12, the working medium is sent into the low-temperature heat accumulator for further heat exchange through the fourth electromagnetic three-way regulating valve 304, and then into the working medium storage tank 7. S323: When the low-temperature flue gas waste heat in the steel plant meets the high-temperature heat accumulator storage control pseudo signal y, the working medium is sent into the waste heat exchanger 2 through the first electromagnetic three-way regulating valve 301, and after heat exchange, the working medium is sent into the third electromagnetic three-way regulating valve 303 through the second electromagnetic three-way regulating valve 302, and after being regulated by the third electromagnetic three-way regulating valve 303, the working medium is sequentially sent into the high-temperature heat accumulator 9 and the low-temperature heat accumulator 10 for heat exchange, and then into the working medium storage tank 7 through the electromagnetic valve 8.

[0046] S33: When the pseudo random signal y meets the operation of the ORC system and the Carnot cell, the specific operation is as follows: S331: When the pseudo random signal y meets the low-temperature heat accumulator of the ORC system and the Carnot cell, the working medium is sent into the waste heat exchanger 2 through the first electromagnetic three-way regulating valve 301, and after heat exchange, the working medium is sent into the third electromagnetic three-way regulating valve 303 and the four-way regulating valve 11 according to the proportion of the pseudo random signal y through the second electromagnetic three-way regulating valve 302, and then into the expander 4 for power generation through the third electromagnetic three-way regulating valve 303, and then into the working medium storage tank 7 through the condenser 5 and the working medium pump 6. Part of the working medium is sent into the working medium storage tank 7 through the fourth electromagnetic three-way regulating valve 304 after heat exchange in the low-temperature heat accumulator 10, and then through the electromagnetic valve 8. S332: When the pseudo random signal y meets the high-temperature heat accumulator of the ORC system and the Carnot cell, the working medium is sent into the waste heat exchanger 2 through the first electromagnetic three-way regulating valve 301, and after heat exchange, the working medium is sent into the electromagnetic valve 303 through the second electromagnetic three-way regulating valve 302, and then into the expander 4 for power generation and the high-temperature heat accumulator 9 according to the proportion of the pseudo random signal y through the third electromagnetic three-way regulating valve 303, and then into the working medium storage tank 7 through the condenser 5 and the working medium pump 6 after power generation by the expander 4. Part of the working medium is sent into the working medium storage tank 7 through the electromagnetic valve 8 after heat exchange in the low-temperature heat accumulator 9 through the three-way regulating valve 304.

[0047] This embodiment is based on the fuzzy T-S dynamic clustering algorithm to construct a multi-energy flow collaborative optimization mechanism, improve the flue gas waste heat recovery rate, and significantly improve the efficiency of waste heat resource cascade utilization and the flexibility of energy system operation, providing an efficient solution for deep recovery of low-temperature waste heat in the steel industry. Through the Carnot cell combined with the ORC system, the pseudo random signal modulated by the T-S fuzzy control dynamically stimulates the ORC unit, constructs a multi-energy flow collaborative optimization mechanism, and effectively solves the technical problems of poor adaptability of the steel plant waste heat recovery system to the time-varying characteristics of the flue gas parameters and low energy storage and release efficiency.

[0048] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0049] Embodiment 3 Referring to Figure 2 , the present embodiment is used to realize the principle of the above-mentioned method embodiment to construct a waste heat utilization system coupling fuzzy control, ORC and Carnot cell, including a multi-output ORC system composed of controlled regulating valve and working medium processing unit; The working medium processing units are connected through the controlled regulating valve, and the controlled regulating valve includes electromagnetic three-way regulating valve, electromagnetic valve 8 and four-way regulating valve 11; the electromagnetic three-way regulating valve includes first electromagnetic three-way regulating valve 301, second electromagnetic three-way regulating valve 302, third electromagnetic three-way regulating valve 303 and fourth electromagnetic three-way regulating valve 304.

[0050] The working medium processing unit includes low-temperature flue gas chimney 1 of steel plant, waste heat exchanger 2, expander 4, condenser 5, working medium pump 6, working medium storage tank 7, high-temperature heat accumulator 9, low-temperature heat accumulator 10, compressor 12, cooling tower 13, water pump 14, cooling control valve 15 and liquid storage tank 16; the condenser 5, the cooling tower 13, the water pump 14, the cooling control valve 15 and the liquid storage tank 16 are composed of a cooling cycle.

[0051] Each sub-module is mainly used to realize each step of the method embodiment, which will not be described here.

[0052] It should be pointed out that according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operation of the steps / components can be combined into a new step / component to achieve the purpose of the present application.

[0053] The present embodiment also includes a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory complete the communication among each other through the communication bus; the memory stores a computer program, when the program is executed by the processor, the processor executes the steps of the waste heat utilization method coupling fuzzy control, ORC and Carnot cell.

[0054] The present embodiment also provides a computer readable storage medium having executable instructions stored thereon, which instructions are executed by a processor to enable the processor to implement the waste heat utilization method coupling fuzzy control, ORC and Carnot cell.

[0055] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.

[0056] Furthermore, the present application can take the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0057] The present application is described in reference to the flow diagrams of the methods and computer program products according to embodiments 1 of the present application and the block diagrams of the apparatuses (systems) of embodiment 3. It will be understood that each flow or block in the flow diagrams or block diagrams, and combinations of flows or blocks in the flow diagrams or block diagrams, can be implemented by computer program instructions.

[0058] These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flow diagrams or block diagrams block or blocks. Figure 1 Figure 1 The functions specified in the flow diagrams or block diagrams block or blocks can be coupled by coupling the fuzzy control, ORC and Carnot battery waste heat utilization system.

[0059] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow diagrams or block diagrams flow or flows or block or blocks. Figure 1 Figure 1 The functions specified in the flow diagrams or block diagrams flow or flows or block or blocks can be coupled.

[0060] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow diagrams or block diagrams flow or flows or block or blocks. Figure 1 Figure 1 The functions specified in the flow diagrams or block diagrams flow or flows or block or blocks can be coupled.

[0061] ​​​The above examples are only used for illustrating the design idea and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the present application and to implement it, and the protection scope of the present application is not limited to the above examples. Therefore, any equivalent changes or modifications made according to the disclosed principles and design ideas of the present application are within the protection scope of the present application.

Claims

1. A method for waste heat utilization coupling fuzzy control, ORC and Carnot cell, characterized in that: The method comprises the following steps: S1: coupling the fuzzy control, ORC and the waste heat utilization system of Carnot cell, comprising a plurality of output ORC system composed of controlled regulating valve and working medium processing unit; S2: the parameters of the multi-output ORC system are decomposed into fuzzy rules of multi-input single-output system; S3: the output of the fuzzy rule is set as a modulated pseudo-random signal, and is used as a dynamic disturbance excitation source to perform parameter excitation on the ORC system; and the controlled parameters are dynamically adjusted based on the excitation results.

2. The method of claim 1, wherein the method further comprises: In the step S1, the controlled regulating valve comprises a three-way regulating valve, a four-way regulating valve and an electromagnetic valve; the working medium processing unit comprises a low-temperature flue gas chimney, a waste heat exchanger, an expander, a condenser, a working medium pump, a working medium storage tank, a high-temperature heat accumulator, a low-temperature heat accumulator, a compressor, a cooling tower, a water pump, a cooling control valve and a liquid storage tank; the condenser, the cooling tower, the water pump, the cooling control valve and the liquid storage tank constitute a cooling cycle.

3. The method of claim 1, wherein the method further comprises: In the step S2, the fuzzy rule is that if the input vector of the fuzzy rule is within the clustering radius of a certain data clustering center, the output of the fuzzy rule is equal to the sum of the static output, the transpose of the dynamic parameter vector to be identified and the product of the input vector and the static compensation parameter of the Carnot cell.

4. The method of claim 3, wherein the ORC is coupled to the Carnot cell. In the step S2, if a certain input vector of the fuzzy rule belongs to a certain cluster, the static output is corrected through the actual output corresponding to all input vectors of the fuzzy rule.

5. The method of claim 4, wherein the ORC is coupled to the Carnot cell. In the step S2, the nonlinear output is obtained by weighting and averaging the outputs of the fuzzy rules according to the membership functions of the fuzzy rules; and the membership functions of the fuzzy rules are obtained by the distances between the input vectors and the cluster centers.

6. The method of claim 1, wherein the method further comprises: In the step S3, the parameters include the opening degree of the expander inlet regulating valve, the working medium pump speed, the flue gas mass flow regulating valve opening degree and the working medium heat exchange circulation flow rate of the Carnot cell loop.

7. The method of claim 1, wherein the method further comprises: In the step S3, the specific steps are as follows: S31: when the pseudo-random signal meets the separate operation of the ORC system, the working medium is sent into the expander through the waste heat exchanger to generate electricity, and then the working medium is cooled through the condenser and sent into the working medium storage tank through the working medium pump; S32: when the pseudo-random signal meets the separate operation of the Carnot cell, the low-temperature flue gas waste heat is adjusted according to the pseudo-random signal; S33: when the pseudo-random signal meets the operation of the ORC system and the Carnot cell, the Carnot cell low-temperature heat accumulator or the Carnot cell high-temperature heat accumulator is adjusted according to the pseudo-random signal.

8. The method of claim 7, wherein the ORC is coupled to the Carnot cell. In the step S32, the specific steps are as follows: S321: when the low-temperature flue gas waste heat meets the low-temperature heat accumulator storage control pseudo-random signal, the working medium is exchanged through the waste heat exchanger, then exchanged in the low-temperature heat accumulator, and then sent into the working medium storage tank; S322: when the low-temperature flue gas waste heat cannot meet the low-temperature heat accumulator storage control pseudo-random signal, the working medium is compressed through the compressor, then expanded and exchanged through the high-temperature heat accumulator, further exchanged in the low-temperature heat accumulator, and then sent into the working medium storage tank; S323: when the low-temperature flue gas waste heat meets the high-temperature heat accumulator storage control pseudo-random signal, the working medium is sequentially exchanged in the waste heat exchanger, the high-temperature heat accumulator and the low-temperature heat accumulator, and then sent into the working medium storage tank.

9. The method of claim 7, wherein the ORC is coupled to the Carnot cell. The step S33 comprises the following steps: S331: When the pseudo-random signal meets the ORC system and the Carnot battery low-temperature heat accumulator, the working medium is sent into the waste heat exchanger for heat exchange, and then is divided into two parts according to the pseudo-random signal, one part is sent into the expander for power generation, and then is sent into the working medium storage tank through the condenser and the working medium pump; the other part is sent into the working medium storage tank after heat exchange through the low-temperature heat accumulator; S332: When the pseudo-random signal meets the ORC system and the Carnot battery high-temperature heat accumulator, the working medium is sent into the waste heat exchanger for heat exchange, and then is divided into two parts according to the pseudo-random signal, one part is sent into the expander for power generation, and then is sent into the working medium storage tank through the condenser and the working medium pump; the other part is sent into the working medium storage tank after heat exchange through the high-temperature heat accumulator, and then is sent into the working medium storage tank after further utilization of the waste heat through the low-temperature heat accumulator.

10. A waste heat utilization system coupled with fuzzy control, ORC and Carnot battery, characterized in that: The system establishment sub-module is used for establishing the waste heat utilization system coupled with fuzzy control, ORC and Carnot battery, and comprises a multi-output ORC system composed of a controlled regulating valve and a working medium processing unit; The parameter decomposition sub-module is used for decomposing parameters of the multi-output ORC system into fuzzy rules of a multi-input single-output system; The excitation adjustment sub-module is used for setting an output of the fuzzy rule as a modulated pseudo-random signal, and using the pseudo-random signal as a dynamic disturbance excitation source to perform parameter excitation on the ORC system; and performing dynamic adjustment on the controlled parameters based on the excitation result.

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