A control method, system and storage medium for a thermal power unit

Abstract

The present invention provides a control method, system and storage medium for a thermal power unit, the method comprising: obtaining a heat demand value and a power demand value, and a main heat loss rate of sending heat to a corresponding user end when a flue gas boiler is working, determining a first energy value required to be provided by a gas turbine based on the heat demand value and the main heat loss rate, and determining a second energy value required to be provided by a gas turbine based on the power demand value; judging whether the first energy value is less than the second energy value, if less than, taking the second energy value as the output energy value required to be output by the gas turbine; if not less than, obtaining the unit heat generated by each unit power value output when the generator is working, and the secondary heat loss rate of sending heat to the corresponding user end of the flue gas boiler, and determining the output energy value required to be output by the gas turbine based on the main heat loss rate, the unit heat, the secondary heat loss rate, the first energy value and the second energy value. The present application can improve the utilization efficiency of energy produced by thermal power units.

Description

Technical Field

[0001] The present application relates to the technical field of thermoelectric generator sets, and in particular to a control method, system and storage medium for thermoelectric generator sets. Background Art

[0002] The thermal power unit consists of three parts: gas turbine, flue gas boiler and generator. Thermal power units are environmentally friendly and low-carbon. They can achieve cogeneration through waste heat recovery, protect and utilize the environment, and also have the functions of heating and power supply. They are widely used in urban cogeneration, industry, petrochemical, electricity, steel, chemical fiber, cement and textile fields.

[0003] At present, when the thermal power unit is in working state, each unit of energy generated by the gas turbine will cause the flue gas boiler and the generator to generate a fixed corresponding energy, that is, the ratio between the energy generated by the gas turbine, the flue gas boiler and the generator is fixed. If the existing energy supply method is used to complete the control of the thermal power unit, that is, the gas turbine is responsible for power generation, a large amount of waste heat will be generated during the power generation process, and the flue gas boiler can use the waste heat of the gas turbine to produce high-temperature and high-pressure heat energy, which is then transported to the user end through a pipeline for heating or hot water production; the generator set converts the mechanical energy generated by the gas turbine into electrical energy and supplies power to the user end. In this way, when the user end has a demand for heat or / and electricity, the larger value of the required output energy of the gas turbine corresponding to the heat and the required output energy of the gas turbine corresponding to the electricity is selected as the final energy required to be output by the gas turbine. Although the needs of the user end can also be met, one of the user ends will face the situation of excess energy, resulting in energy waste and reducing the efficiency of energy production of the thermal power unit. Summary of the invention

[0004] In order to improve the efficiency of using energy produced by a thermal power unit, an embodiment of the present application provides a control method, system and storage medium for a thermal power unit.

[0005] In a first aspect, this embodiment provides a control method for a thermal power unit, the method comprising:

[0006] Obtaining a heat demand value and a power demand value, as well as a main heat loss rate of sending heat to a corresponding user end when the flue gas boiler is working, determining a first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and determining a second energy value required to be provided by the gas turbine based on the power demand value;

[0007] determining whether the first energy value is less than the second energy value, and if so, using the second energy value as the output energy value that the gas turbine needs to output;

[0008] If it is not less than, obtain the unit heat generated by each unit power output value when the generator is working, and the secondary heat loss rate of sending heat to the user end corresponding to the flue gas boiler, and determine the output energy value that the gas turbine needs to output based on the main heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value.

[0009] In some embodiments, determining the first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate includes:

[0010] A heat conversion rate of converting the energy value output by the gas turbine into heat is obtained, and the heat demand value is divided by the heat conversion rate and the main heat loss rate in sequence to obtain a first energy value required to be provided by the gas turbine.

[0011] In some embodiments, determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, the first energy value, and the second energy value includes:

[0012] The power demand value is multiplied by the unit heat and the sub-heat loss rate in sequence to determine the basic heat supply value that the generator can provide to the user end corresponding to the flue gas boiler;

[0013] The second energy value output by the gas turbine may be a reference heat supply value provided by a user end corresponding to the flue gas boiler, and it is determined whether the sum of the basic heat supply value and the reference heat supply value is less than the heat demand value. If not, the second energy value is used as the output energy value required to be output by the gas turbine;

[0014] If it is less than, the output energy value that the gas turbine needs to output is determined based on the primary heat loss rate, unit heat, secondary heat loss rate, and the first energy value.

[0015] In some embodiments, determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, and the first energy value includes:

[0016] Obtaining a heat difference between the heat demand value and the sum of the basic heat supply value and the reference heat supply value, and an electric quantity conversion rate of converting the energy value output by the gas turbine into electric quantity;

[0017] The heat conversion rate is multiplied by the main heat loss rate to obtain a main heat allocation value, the power conversion rate is multiplied by the unit heat and the secondary heat loss rate to obtain a secondary heat allocation value, and the main heat allocation value is divided by the secondary heat allocation value to obtain a heat ratio that the energy output by the gas turbine can provide to the user end through the flue gas boiler and the generator;

[0018] The additional energy value required by the gas turbine to meet the heat demand value is determined based on the heat ratio and the heat difference, and the additional energy value is added to the second energy value to obtain the output energy value required to be output by the gas turbine.

[0019] In some embodiments, the method further comprises:

[0020] If the sum of the basic heat supply value and the reference heat supply value is not less than the heat demand value, subtract the heat demand value from the sum of the basic heat supply value and the reference heat supply value to obtain a residual heat value;

[0021] A heat storage instruction is generated based on the remaining heat value to store the heat corresponding to the remaining heat value.

[0022] In some embodiments, after adding the additional energy value to the second energy value to obtain the output energy value required to be output by the gas turbine, the method further comprises:

[0023] The output energy value is multiplied by the power conversion rate to obtain the actual power that the generator can provide, and the power requirement value is subtracted from the actual power to obtain the remaining power;

[0024] A power storage instruction is generated based on the remaining power to store the remaining power.

[0025] In some embodiments, the method further comprises:

[0026] If the first energy value is less than the second energy value, multiplying the output energy value by the heat conversion rate and the main heat loss rate to obtain an excess heat value that can be provided to the user end corresponding to the flue gas boiler;

[0027] Subtracting the calorie requirement value from the excess calorie value to obtain an excess calorie value;

[0028] A heat storage instruction is generated based on the excess heat value to store the heat corresponding to the excess heat value.

[0029] In a second aspect, this embodiment provides a control system for a thermal power unit, the system comprising: an acquisition module, a calculation module, a judgment module and a control module; wherein:

[0030] The acquisition module is used to acquire the heat demand value and the power demand value, as well as the main heat loss rate of sending heat to the corresponding user end when the flue gas boiler is working;

[0031] The calculation module is used to determine a first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and to determine a second energy value required to be provided by the gas turbine based on the power demand value;

[0032] The judging module is used to judge whether the first energy value is less than the second energy value;

[0033] The control module is used to use the second energy value as the output energy value that the gas turbine needs to output if it is less than ; the acquisition module is also used to obtain the unit heat generated by each unit power value output when the generator is working, and the secondary heat loss rate of sending heat to the user end corresponding to the flue gas boiler if it is not less than ;

[0034] The control module is further used to determine the output energy value that the gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value.

[0035] In some of the embodiments, the acquisition module is further used to acquire a heat conversion rate of converting the energy value output by the gas turbine into heat;

[0036] The calculation module is further used to multiply the output energy value by the heat conversion rate and the main heat loss rate to obtain an excess heat value that can be provided to the user end corresponding to the flue gas boiler; and to subtract the heat demand value from the excess heat value to obtain an excess heat value;

[0037] The control module is further used to generate a heat storage instruction based on the excess heat value to store the heat corresponding to the excess heat value.

[0038] In a third aspect, this embodiment provides a computer-readable storage medium on which a computer program that can be run on a processor is stored. When the computer program is executed by the processor, a control method for a thermal power unit as described in the first aspect is implemented.

[0039] By adopting the above method, the present application first obtains the heat demand value and the power demand value, as well as the main heat loss rate of sending heat to the corresponding user end when the flue gas boiler is working, and determines the first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and determines the second energy value required to be provided by the gas turbine based on the power demand value. In this way, the heat demand value for heat and the power demand value for power of the user end are used to determine the first energy value required to provide heat to the user end by relying solely on the energy output by the gas turbine, and the second energy value required to provide power to the user end by relying solely on the energy output by the gas turbine, so as to provide guidance for further determining the energy that the gas turbine can output to meet the needs of the user end.

[0040] Then determine whether the first energy value is less than the second energy value. If so, use the second energy value as the output energy value that the gas turbine needs to output. In this way, since the generator will generate heat when it is working, and electricity can be converted into heat, but heat is generally not easy to convert into electricity, in order to meet the user's demand for electricity and heat at the same time, when the first energy value is less than the second energy value, the second energy value needs to be used as the output energy value that the gas turbine needs to output. After all, if the first energy value is used as the output energy value that the gas turbine needs to output, it cannot meet the user's demand for electricity.

[0041] Finally, if it is not less than, the unit heat generated by each unit power value output when the generator is working, and the secondary heat loss rate of sending heat to the user end corresponding to the flue gas boiler are obtained, and the output energy value that the gas turbine needs to output is determined based on the main heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value. In this way, since the generator generates heat when it is working and the electricity can be converted into heat, without using other equipment and wasting other energy, only the heat generated by the generator when it is working and the electricity exceeding the electricity demand value can be used to provide part of the heat for the user end corresponding to the flue gas boiler, so that the gas turbine can meet the heat demand value and the electricity demand value of the user end without providing the first energy value, and achieve the technical effect of improving the efficiency of the energy produced by the thermal power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the composition distribution of the thermal power unit provided in the embodiment of the present application.

[0043] Figure 2 It is a flow chart of a control method of a thermal power unit provided in an embodiment of the present application.

[0044] Figure 3 It is a block diagram provided in an embodiment of the present application for determining the output energy value that a gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value.

[0045] Figure 4 It is a block diagram provided in an embodiment of the present application for determining the output energy value that the gas turbine needs to output based on the main heat loss rate, unit heat, secondary heat loss rate, and first energy value.

[0046] Figure 5 It is a control system framework diagram of a thermal power unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. However, it should be understood by those of ordinary skill in the art that the present application can be implemented without these details. For those of ordinary skill in the art, it is obvious that various changes can be made to the embodiments disclosed in the present application, and without departing from the principles and scope of the present application, the general principles defined in the present application can be applied to other embodiments and application scenarios. Therefore, the present application is not limited to the embodiments shown, but conforms to the broadest scope consistent with the scope claimed for protection in the present application.

[0048] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0049] Figure 1 Schematic diagram of the composition and distribution of the thermal power unit provided in the embodiment of the present application. Figure 1 As shown, the thermal power unit includes a gas turbine, a flue gas boiler and a generator. The flue gas boiler corresponds to a corresponding user end, and the generator also corresponds to a corresponding user end. The user end corresponding to the flue gas boiler and the user end corresponding to the generator may be the same or different, which can be determined according to actual conditions. No further limitation is made here on the user end. Among them, the gas turbine is connected to the flue gas boiler through a first pipeline, and the gas turbine is connected to the generator through a second pipeline. A corresponding first valve is provided on the first pipeline to control the opening and closing of the gas turbine and the flue gas boiler, that is, to transfer the heat generated by the gas turbine to the flue gas boiler, so that the flue gas boiler provides heat to the corresponding user end; a corresponding second valve is provided on the second pipeline to control the opening and closing of the gas turbine and the generator, that is, to transfer the mechanical energy generated by the gas turbine to the generator, so that the generator provides electricity to the corresponding user end.

[0050] In addition, a third pipeline is provided between the flue gas boiler and the generator, and the third pipeline is provided with a third valve. The generator can send the heat generated in the power generation process to the flue gas boiler through the third pipeline, so that the flue gas boiler provides heat to the corresponding user end. In this way, through the composition distribution of the thermal power unit disclosed in the embodiment of the present application, the heat source of the user end corresponding to the flue gas boiler is not limited to the gas turbine, but can also be provided by the gas turbine and the generator together.

[0051] Figure 2 1 is a flow chart of a control method for a thermal power unit provided in an embodiment of the present application. Figure 2 As shown, a control method for a thermal power unit includes the following steps:

[0052] Step S100, obtaining a heat demand value and a power demand value, as well as a main heat loss rate of sending heat to a corresponding user end when the flue gas boiler is working, determining a first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and determining a second energy value required to be provided by the gas turbine based on the power demand value.

[0053] A control terminal for controlling the operation of the thermal power unit is provided in the thermal power unit. The embodiment of the present application describes how to control the thermal power unit from the perspective of the control terminal. The above-mentioned heat demand value refers to the heat demand value of the user terminal corresponding to the flue gas boiler, and the power demand value refers to the power demand value of the user terminal corresponding to the generator. The user terminal corresponding to the flue gas boiler can send its own heat demand value to the control terminal by wired or wireless means, so that the control terminal obtains the heat demand value. Similarly, the user terminal corresponding to the generator can send its own power demand value to the control terminal by wired or wireless means, so that the control terminal obtains the power demand value.

[0054] The above main heat loss rate refers to the loss rate of heat sent to the corresponding user end when the flue gas boiler is working. Once the hardware corresponding to the thermal power unit is built, the loss rate of heat sent to the corresponding user end during the working time of the flue gas boiler is also fixed. The main heat loss rate can be obtained by testing before the thermal power unit is put into use and stored in the control end. Therefore, the main heat loss rate can be obtained by viewing the information stored in the control end.

[0055] The fundamental source of heat and / or electricity for the user end is the corresponding energy provided by the gas turbine, that is, the gas turbine needs to be in working state to provide the corresponding heat and / or electricity to the user end through the pipeline. The above-mentioned first energy value refers to the energy value that the gas turbine needs to provide when the heat demand value of the flue gas boiler corresponding to the user end is met; the second energy value refers to the energy value that the gas turbine needs to provide when the electricity demand value of the generator corresponding to the user end is met.

[0056] The first energy value may be determined by a heat demand value and a main heat loss rate. Determining the first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate includes: obtaining a heat conversion rate of converting energy output by the gas turbine into heat, and dividing the heat demand value by the heat conversion rate and the main heat loss rate in sequence to obtain the first energy value required to be provided by the gas turbine.

[0057] The above heat conversion rate refers to the conversion rate of the energy output by the gas turbine into heat that can be used by the flue gas boiler. The heat conversion rate is also determined after the hardware corresponding to the thermal power unit is built, and the heat conversion rate is a fixed value. The heat conversion rate can be obtained by testing before the thermal power unit is put into use and stored in the control end. The heat conversion rate can be obtained by checking the information stored in the control end. Then substitute the heat conversion rate, main heat loss rate and heat demand value into the formula of energy value × heat conversion rate × main heat loss rate = heat value, so as to obtain the first energy value required to be provided by the gas turbine by dividing the heat demand value by the heat conversion rate and the main heat loss rate in turn.

[0058] Similarly, after the hardware corresponding to the thermal power unit is built, the power conversion rate of the energy output by the gas turbine into the mechanical energy that can be used by the generator and converted into electrical energy is also determined, that is, the power conversion rate of the energy value output by the gas turbine into the power, and the power conversion rate is a fixed value. The heat conversion rate can be obtained by testing before the thermal power unit is put into use, and stored in the control end, so that the power conversion rate can be obtained by viewing the information stored in the control end. Then the power conversion rate and the power demand value are substituted into the formula of energy value × power conversion rate = power value, so as to obtain the second energy value required to be provided by the gas turbine by dividing the power demand value by the power conversion rate. In this way, the heat demand value for heat and the power demand value for electricity of the user end are used to determine the first energy value required to provide heat for the user end by relying only on the energy output by the gas turbine, and the second energy value required to provide electricity for the user end by relying only on the energy output by the gas turbine, so as to provide guidance for further determining that the gas turbine can output energy that meets the needs of the user end.

[0059] Step S200, determining whether the first energy value is less than the second energy value, and if so, taking the second energy value as the output energy value that the gas turbine needs to output.

[0060] The magnitude relationship between the first energy value and the second energy value can be determined by subtracting or dividing the first energy value and no further limitation is made here on how to judge whether the first energy value is less than the second energy value. Since the generator generates heat when it is working, and the electricity can be converted into heat, but heat is generally not easy to convert into electricity, in order to meet the user's demand for both electricity and heat, when the first energy value is less than the second energy value, the second energy value needs to be used as the output energy value that the gas turbine needs to output. After all, if the first energy value is used as the output energy value that the gas turbine needs to output, the user's demand for electricity cannot be met.

[0061] In addition, when the first energy value is less than the second energy value, the gas turbine uses the second energy value as the output energy value it needs to output, which will make the heat value received by the user end corresponding to the flue gas boiler greater than the heat demand value. Therefore, in order to reduce energy waste, if the first energy value is less than the second energy value, the output energy value is also multiplied by the heat conversion rate and the main heat loss rate to obtain the excess heat value that can be provided to the user end corresponding to the flue gas boiler; the excess heat value is subtracted from the heat demand value to obtain the excess heat value; and a heat storage instruction is generated based on the excess heat value to store the heat corresponding to the excess heat value.

[0062] That is, the output energy value, heat conversion rate, and main heat loss rate are substituted into the formula of energy value × heat conversion rate × main heat loss rate = heat value, so that the output energy value is multiplied by the heat conversion rate and the main heat loss rate, and the result of the multiplication is the excess heat value that can be provided to the user end corresponding to the flue gas boiler when the gas turbine outputs energy at the output energy value. The excess heat value is greater than the heat demand value, and the excess heat value can be obtained by subtracting the heat demand value from the excess heat value, that is, the extra heat value provided to the user end corresponding to the flue gas boiler. When the excess heat value is determined, the control end generates a corresponding heat storage instruction according to the excess heat value to store the excess heat value of the user end corresponding to the flue gas boiler, thereby reducing the waste of the extra heat value.

[0063] Furthermore, the control end may be selected to generate a secondary heat storage instruction to store the heat generated when the generator provides electricity to the corresponding user end, thereby further reducing heat waste.

[0064] Step S300, if it is not less than, obtain the unit heat generated by each unit power output value when the generator is working, and the secondary heat loss rate of sending heat to the corresponding user end of the flue gas boiler, and determine the output energy value that the gas turbine needs to output based on the main heat damage rate, unit heat, secondary heat loss rate, first energy value and second energy value.

[0065] When the first energy value is not less than the second energy value, it indicates that when only the gas turbine provides heat and electricity, the energy required by the gas turbine corresponding to the heat demand value is greater than the energy required by the gas turbine corresponding to the electricity demand value. Since the generator generates heat when it is working, and the electricity can be converted into heat, without using other equipment or wasting other energy, only the heat generated by the generator when it is working and the electricity exceeding the electricity demand value can also provide part of the heat for the user end corresponding to the flue gas boiler, so that the gas turbine can meet the heat demand value and the electricity demand value of the user end without providing the first energy value, thereby achieving the technical effect of improving the efficiency of the use of energy produced by the thermal power unit.

[0066] The above-mentioned unit heat refers to the heat value that will be generated simultaneously for each unit of electricity output by the generator. The secondary heat loss rate refers to the loss rate of heat sent by the generator to the corresponding user end of the flue gas boiler through the third pipeline. Once the hardware corresponding to the thermal power unit is determined and built, the unit heat and secondary heat loss rates are also fixed. The unit heat and secondary heat loss rates can be obtained through testing before the thermal unit is officially put into use, and stored in the control end, so that the unit heat and secondary heat loss rates can be obtained by checking the information stored in the control end.

[0067] In order to further determine how much energy the gas turbine needs to output to maximize the utilization efficiency of the energy produced by the thermal power unit and to simultaneously meet the user's demand for heat and electricity when the first energy value is not less than the second energy value, it is also necessary to determine the output energy value that the gas turbine needs to output based on the main heat loss rate, unit heat, secondary heat loss rate, the first energy value and the second energy value. Figure 3 This is a block diagram of determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value provided by an embodiment of the present application. Figure 3 As shown, determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, the first energy value and the second energy value includes the following steps:

[0068] Step S301 : multiply the power demand value by the unit heat and the secondary heat loss rate in sequence to determine the basic heat supply value that the generator can provide to the user end corresponding to the flue gas boiler.

[0069] Step S302, obtaining the second energy value output by the gas turbine, which may be a reference heat supply value provided by the flue gas boiler corresponding to the user end, and judging whether the sum of the basic heat supply value and the reference heat supply value is less than the heat demand value, if not, taking the second energy value as the output energy value required to be output by the gas turbine.

[0070] Step S303: If it is less than, determine the output energy value that the gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, and the first energy value.

[0071] Since the electricity required by the user end can only be supplied by the gas turbine, in order to satisfy the energy output by the gas turbine to meet the user end's demand for electricity and heat at the same time, the energy value that the gas turbine needs to output is at least the second energy value. On the one hand, the electricity demand value is first multiplied by the unit heat to obtain how much heat the generator can generate while generating the electricity corresponding to the electricity demand value, and then multiplied by the secondary heat loss rate to obtain the minimum heat value of these heats delivered to the corresponding user end of the flue gas boiler through the third pipeline, that is, the basic heat value. On the other hand, the second energy value, the heat conversion rate and the main heat loss rate are substituted into the formula of energy value × heat conversion rate × main heat loss rate = heat value to obtain the heat value that the gas turbine outputs the second energy value to provide for the corresponding user end of the flue gas boiler, that is, the reference heat supply value. Thus, the heat addition value is obtained by adding the basic heat supply value and the reference heat supply value, and the heat addition value is compared with the heat demand value.

[0072] If the added heat value is not less than the heat demand value, it means that the gas turbine can meet the user's demand for heat and electricity at the same time with the second energy value as the output energy value, and when the second energy value is insufficient to provide heat to the user, the heat generated in the electricity production process is transmitted to the user through the third pipeline to compensate for the missing heat, so that the flue gas boiler corresponding to the user can also obtain the energy corresponding to the heat demand value. In this way, there is no need to increase the heat value output by the gas turbine to meet the user's demand for heat and electricity, thereby improving the efficiency of energy production by the thermal power unit.

[0073] In addition, if the sum of the basic heat supply value and the reference heat supply value is not less than the heat demand value, this embodiment will also subtract the heat demand value from the sum of the basic heat supply value and the reference heat supply value to obtain a remaining heat value; and generate a heat storage instruction based on the remaining heat value to store the heat corresponding to the remaining heat value.

[0074] That is, the basic heat supply value and the reference heat supply value are added to obtain the heat addition value, and then the heat demand value is subtracted from the heat addition value to obtain the excess heat value after the heat demand of the user is met, that is, the remaining heat value. In order to reduce the waste of this part of heat, the control end also generates a corresponding heat storage instruction according to the numerical value corresponding to the remaining heat value, so that the corresponding heat storage device stores the heat corresponding to the remaining heat value.

[0075] If the sum of the heat values ​​is less than the heat demand value, it indicates that the gas turbine cannot simultaneously meet the user's demand for heat and electricity using the second energy value as the output energy value, and the energy value that the gas turbine needs to output needs to be between the first energy value and the second energy value. The output energy value that the gas turbine needs to output can be determined based on the primary heat loss rate, unit heat, secondary heat loss rate, and the first energy value. Figure 4 This is a block diagram of determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, and first energy value provided by the embodiment of the present application. Figure 4 As shown, determining the output energy that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, and the first energy value includes the following steps:

[0076] Step S303-1, obtaining the heat difference between the heat demand value and the sum of the basic heat supply value and the reference heat supply value, and the power conversion rate of converting the energy value output by the gas turbine into power.

[0077] Step S303-2, multiply the heat conversion rate by the main heat loss rate to obtain the main heat allocation value, multiply the power conversion rate by the unit heat and the secondary heat loss rate to obtain the secondary heat allocation value, and divide the main heat allocation value by the secondary heat allocation value to obtain the heat ratio that the energy output by the gas turbine can provide to the user end through the flue gas boiler and the generator.

[0078] Step S303-3, determining the additional energy value required by the gas turbine to meet the heat demand value based on the heat ratio value and the heat difference value, and adding the additional energy value to the second energy value to obtain the output energy value required to be output by the gas turbine.

[0079] If the sum of the basic heat supply value and the reference heat supply value is less than the heat supply value, this embodiment can obtain the heat value that is still missing from the flue gas boiler corresponding to the user end if the second energy value is used as the output energy value, that is, the heat difference value, by subtracting the heat addition value from the heat demand value. The above-mentioned method for obtaining the power conversion rate has been disclosed in the above-mentioned step S100 and will not be repeated here. Then substitute the heat conversion rate, the main heat loss rate, the power conversion rate, the unit heat, and the secondary heat loss rate into In this formula, we can obtain the heat ratio of the energy output by the gas turbine to the heat provided by the flue gas boiler and the generator to the corresponding user end of the flue gas boiler. Then divide the numerator in the heat ratio by the sum of the numerator and the denominator in the heat ratio to obtain the ratio of the heat provided by the gas turbine to the heat provided by the gas turbine and the generator that the corresponding user end of the flue gas boiler will receive after each energy output of the gas turbine. Next, multiply the heat difference by this ratio to obtain the additional heat value that the flue gas boiler needs to obtain from the gas turbine. Finally, substitute the additional heat value, heat conversion rate, and main heat loss rate into the formula of energy value × heat conversion rate × main heat loss rate = heat value to obtain the additional energy value that the gas turbine needs to provide to meet the heat demand value.

[0080] Or after obtaining the heat ratio, the denominator in the heat ratio is then divided by the sum of the numerator and denominator in the heat ratio to obtain the ratio of the heat provided by the generator to the heat provided by the gas turbine and the generator that the user end corresponding to the flue gas boiler will receive after each energy output of the gas turbine. Next, multiply the heat difference by the ratio to obtain the additional heat value that the flue gas boiler needs to obtain from the generator. Finally, substitute the additional heat value, heat conversion rate, and main heat loss rate into the formula of energy value × power conversion rate × unit power × secondary heat loss rate = heat value to obtain the additional energy value that the gas turbine needs to provide to meet the heat demand value. Therefore, after the additional energy value is determined, the output energy value that the gas turbine needs to output can be obtained by adding the additional energy value to the second energy value. In this way, when it is determined that the gas turbine only uses the second energy value as the output energy value and cannot meet the user's demand for heat, the heat is compensated by using the maximum heat that the generator can provide to the flue gas boiler, so as to minimize the output energy value of the gas turbine on the basis of the second energy value output. On the premise of meeting the user's demand for heat, the utilization efficiency of the energy produced by the thermal power unit is improved.

[0081] In addition, when the gas turbine uses the energy value that is the sum of the second energy value and the additional energy value as the output energy value, the amount of electricity generated by the generator will exceed the electricity demand value. In order to reduce the waste of electricity, after adding the additional energy value to the second energy value to obtain the output energy value that the gas turbine needs to output, this embodiment further multiplies the output energy value by the electricity conversion rate to obtain the actual amount of electricity that the generator can provide, and subtracts the electricity demand value from the actual amount of electricity to obtain the remaining amount of electricity; and generates an electricity storage instruction based on the remaining amount of electricity to store the remaining amount of electricity.

[0082] That is, the power conversion rate and output energy value are substituted into the formula of energy value × power conversion rate = power value to obtain the actual power that the generator can provide. Then the power difference obtained by subtracting the power demand value from the actual power is the remaining power. In order to prevent this part of the power from being wasted, the control end also generates a corresponding power storage instruction according to the value corresponding to the remaining power, so that the corresponding power storage device can store the remaining power.

[0083] Figure 5 : is a control system framework diagram of a thermal power unit provided in an embodiment of the present application. Figure 5 As shown, a control system of a thermal power unit includes an acquisition module, a calculation module, a judgment module and a control module.

[0084] Among them, the acquisition module is used to obtain the heat demand value and the power demand value, as well as the main heat loss rate of sending heat to the corresponding user end when the flue gas boiler is working. The calculation module is used to determine the first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and determine the second energy value required to be provided by the gas turbine based on the power demand value. The judgment module is used to determine whether the first energy value is less than the second energy value. The control module is used to use the second energy value as the output energy value that the gas turbine needs to output if it is less than. The acquisition module is also used to obtain the unit heat generated by each unit power value output when the generator is working, and the secondary heat loss rate of sending heat to the corresponding user end of the flue gas boiler if it is not less than. The control module is also used to determine the output energy value that the gas turbine needs to output based on the main heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value.

[0085] In addition, the acquisition module is also used to obtain the heat conversion rate of converting the energy value output by the gas turbine into heat. The calculation module is also used to multiply the output energy value by the heat conversion rate and the main heat loss rate to obtain the excess heat value that can be provided to the user end corresponding to the flue gas boiler; the excess heat value is subtracted from the heat demand value to obtain the excess heat value. The control module is also used to generate a heat storage instruction based on the excess heat value to store the heat corresponding to the excess heat value.

[0086] Other functions performed by the acquisition module, calculation module, judgment module and control module as well as the technical details of each function are the same or similar to the corresponding features in the control method of a thermal power unit described above, so they are not repeated here.

[0087] The embodiment of the present application further provides a computer storage medium on which a computer program is stored. When the computer program is run on a computer, the computer can execute the steps in the control method of a thermal power unit described above.

[0088] It should be understood that, although the steps in the flowchart of the accompanying drawings are shown in sequence according to the instructions of the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless explicitly stated in this document, the execution of these steps is not strictly limited in order and can be performed in other orders.

[0089] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A control method for a thermal power unit, characterized in that: The method comprises: Obtaining a heat demand value and a power demand value, as well as a main heat loss rate of sending heat to a corresponding user end when the flue gas boiler is working, determining a first energy value that needs to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and determining a second energy value that needs to be provided by the gas turbine based on the power demand value, wherein the first energy value refers to the energy value that needs to be provided by the gas turbine when the heat demand value required by the corresponding user end of the flue gas boiler is met, and the second energy value refers to the energy value that needs to be provided by the gas turbine when the power demand value required by the corresponding user end of the generator is met; determining whether the first energy value is less than the second energy value, and if so, using the second energy value as the output energy value that the gas turbine needs to output; If it is not less than, obtain the unit heat generated by each unit power value output when the generator is working, and the secondary heat loss rate of sending heat to the user end corresponding to the flue gas boiler, and determine the output energy value that the gas turbine needs to output based on the main heat loss rate, unit heat, secondary heat loss rate, first energy value and second energy value; Wherein, determining the first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate includes: Obtaining a heat conversion rate of converting the energy value output by the gas turbine into heat, and dividing the heat demand value by the heat conversion rate and the main heat loss rate in sequence to obtain a first energy value required to be provided by the gas turbine; The step of determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, the first energy value, and the second energy value comprises: The power demand value is multiplied by the unit heat and the sub-heat loss rate in sequence to determine the basic heat supply value that the generator can provide to the user end corresponding to the flue gas boiler; The second energy value output by the gas turbine may be a reference heat supply value provided by a user end corresponding to the flue gas boiler, and it is determined whether the sum of the basic heat supply value and the reference heat supply value is less than the heat demand value. If not, the second energy value is used as the output energy value required to be output by the gas turbine; If it is less than, determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, and the first energy value; The step of determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, and the first energy value comprises: Obtaining a heat difference between the heat demand value and the sum of the basic heat supply value and the reference heat supply value, and an electric quantity conversion rate of converting the energy value output by the gas turbine into electric quantity; The heat conversion rate is multiplied by the main heat loss rate to obtain a main heat allocation value, the power conversion rate is multiplied by the unit heat and the secondary heat loss rate to obtain a secondary heat allocation value, and the main heat allocation value is divided by the secondary heat allocation value to obtain a heat ratio that the energy output by the gas turbine can provide to the user end through the flue gas boiler and the generator; The additional energy value required by the gas turbine to meet the heat demand value is determined based on the heat ratio and the heat difference, and the additional energy value is added to the second energy value to obtain the output energy value required to be output by the gas turbine.

2. The method according to claim 1, characterized in that The method further comprises: If the sum of the basic heat supply value and the reference heat supply value is not less than the heat demand value, subtracting the heat demand value from the sum of the basic heat supply value and the reference heat supply value to obtain a residual heat value; A heat storage instruction is generated based on the remaining heat value to store the heat corresponding to the remaining heat value.

3. The method according to claim 1, characterized in that After adding the additional energy value to the second energy value to obtain the output energy value required to be output by the gas turbine, the following further comprises: The output energy value is multiplied by the power conversion rate to obtain the actual power that the generator can provide, and the power requirement value is subtracted from the actual power to obtain the remaining power; A power storage instruction is generated based on the remaining power to store the remaining power.

4. The method according to claim 1, characterized in that The method further comprises: If the first energy value is less than the second energy value, multiplying the output energy value by the heat conversion rate and the main heat loss rate to obtain an excess heat value that can be provided to the user end corresponding to the flue gas boiler; Subtracting the calorie requirement value from the excess calorie value to obtain an excess calorie value; A heat storage instruction is generated based on the excess heat value to store heat corresponding to the excess heat value.

5. A control system for a thermal power unit, characterized in that: The system includes: an acquisition module, a calculation module, a judgment module and a control module; wherein, The acquisition module is used to acquire the heat demand value and the power demand value, as well as the main heat loss rate of sending heat to the corresponding user end when the flue gas boiler is working; The calculation module is used to determine a first energy value that needs to be provided by the gas turbine based on the heat demand value and the main heat loss rate, and to determine a second energy value that needs to be provided by the gas turbine based on the power demand value, wherein the first energy value refers to the energy value that needs to be provided by the gas turbine when the heat demand value required by the user end corresponding to the flue gas boiler is met, and the second energy value refers to the energy value that needs to be provided by the gas turbine when the power demand value required by the user end corresponding to the generator is met; The judging module is used to judge whether the first energy value is less than the second energy value; The control module is used for, if less than, using the second energy value as the output energy value required to be output by the gas turbine; The acquisition module is also used to obtain the unit heat generated by each unit power value output when the generator is working, and the secondary heat loss rate of sending heat to the corresponding user end of the flue gas boiler; The control module is further used to determine the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, the first energy value and the second energy value; Wherein, determining the first energy value required to be provided by the gas turbine based on the heat demand value and the main heat loss rate includes: Obtaining a heat conversion rate of converting the energy value output by the gas turbine into heat, and dividing the heat demand value by the heat conversion rate and the main heat loss rate in sequence to obtain a first energy value required to be provided by the gas turbine; The step of determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, the first energy value, and the second energy value comprises: The power demand value is multiplied by the unit heat and the sub-heat loss rate in sequence to determine the basic heat supply value that the generator can provide to the user end corresponding to the flue gas boiler; The second energy value output by the gas turbine may be a reference heat supply value provided by a user end corresponding to the flue gas boiler, and it is determined whether the sum of the basic heat supply value and the reference heat supply value is less than the heat demand value. If not, the second energy value is used as the output energy value required to be output by the gas turbine; If it is less than, determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, unit heat, secondary heat loss rate, and the first energy value; The step of determining the output energy value that the gas turbine needs to output based on the primary heat loss rate, the unit heat, the secondary heat loss rate, and the first energy value comprises: Obtaining a heat difference between the heat demand value and the sum of the basic heat supply value and the reference heat supply value, and an electric quantity conversion rate of converting the energy value output by the gas turbine into electric quantity; The heat conversion rate is multiplied by the main heat loss rate to obtain a main heat allocation value, the power conversion rate is multiplied by the unit heat and the secondary heat loss rate to obtain a secondary heat allocation value, and the main heat allocation value is divided by the secondary heat allocation value to obtain a heat ratio that the energy output by the gas turbine can provide to the user end through the flue gas boiler and the generator; The additional energy value required by the gas turbine to meet the heat demand value is determined based on the heat ratio and the heat difference, and the additional energy value is added to the second energy value to obtain the output energy value required to be output by the gas turbine.

6. The system according to claim 5, characterized in that The acquisition module is further used to acquire a heat conversion rate of converting the energy value output by the gas turbine into heat; The calculation module is further used to multiply the output energy value by the heat conversion rate and the main heat loss rate to obtain an excess heat value that can be provided to the user end corresponding to the flue gas boiler; and to subtract the heat demand value from the excess heat value to obtain an excess heat value; The control module is further used to generate a heat storage instruction based on the excess heat value to store the heat corresponding to the excess heat value.

7. A computer-readable storage medium having stored thereon a computer program that can be run on a processor, characterized in that: When the computer program is executed by the processor, the control method of a thermal power unit as claimed in any one of claims 1 to 4 is implemented.

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