Method and device for determining steam pressure of back-pressure steam turbine

Abstract

The present application provides a method and device for determining the steam pressure of a back-pressure steam turbine. The method includes: receiving a request for determining the steam pressure of a target back-pressure steam turbine; if the steam pressure determination request includes: a first steam turbine parameter, an external heat supply amount, and a preset first back-pressure steam pressure, then determine a first back-pressure heat supply amount according to the first steam turbine parameter and the preset first back-pressure steam pressure; determine whether the first back-pressure heat supply amount is greater than or equal to the external heat supply amount, and if so, determine a first energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset first back-pressure steam pressure; determine whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold, and if so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset first back-pressure steam pressure. The present application can improve the overall efficiency and reliability of the back-pressure steam turbine, and thus can improve the economic efficiency of the operation of the back-pressure steam turbine.

Description

Technical Field

[0001] The present application relates to the field of power technology, and in particular, to a method and device for determining the steam pressure of a backpressure steam turbine. Background Art

[0002] The steam that has done work in the steam turbine is discharged at a pressure higher than the atmospheric pressure, and the exhaust steam is to be supplied to other heat users such as industry or heating. Such a steam turbine is called a backpressure steam turbine, or simply a backpressure machine; the magnitude of the steam pressure affects the energy efficiency evaluation result of the backpressure steam turbine, that is, it affects the economy of the backpressure steam turbine.

[0003] At present, there is a lack of an efficient and reliable method for determining the steam pressure of a backpressure steam turbine. The steam pressure of the backpressure steam turbine is mainly designed manually based on experience, resulting in problems such as low accuracy and efficiency, and high labor costs. Summary of the Invention

[0004] In view of at least the problems in the prior art, the present application proposes a method and device for determining the steam pressure of a backpressure steam turbine, which can improve the overall efficiency and reliability of the backpressure steam turbine, and thus improve the economy of the operation of the backpressure steam turbine.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a method for determining the steam pressure of a backpressure steam turbine, including:

[0007] Receiving a steam pressure determination request for a target backpressure steam turbine;

[0008] If the steam pressure determination request includes: a first steam turbine parameter, an external heat supply amount, and a preset first backpressure steam pressure, then determine a first backpressure heat supply amount according to the first steam turbine parameter and the preset first backpressure steam pressure;

[0009] Judging whether the first backpressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine a first energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset first backpressure steam pressure;

[0010] Judging whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset first backpressure steam pressure.

[0011] Further, the method for determining the steam pressure of the backpressure steam turbine further includes:

[0012] If the first back-pressure heat supply is less than the external heat supply, then according to the first steam turbine parameters and a preset second back-pressure steam pressure, determine the second back-pressure heat supply, where the preset second back-pressure steam pressure is greater than the preset first back-pressure steam pressure;

[0013] Judge whether the second back-pressure heat supply is greater than or equal to the external heat supply. If so, then according to the first steam turbine parameters and the preset second back-pressure steam pressure, determine the second energy efficiency evaluation result of the target back-pressure steam turbine;

[0014] Judge whether the second energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, then determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset second back-pressure steam pressure.

[0015] Furthermore, the method for determining the steam pressure of the back-pressure steam turbine further includes:

[0016] If the first energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, then according to the first steam turbine parameters and a preset third back-pressure steam pressure, determine the third back-pressure heat supply, where the preset third back-pressure steam pressure is less than the preset first back-pressure steam pressure;

[0017] Judge whether the third back-pressure heat supply is greater than or equal to the external heat supply. If so, then according to the first steam turbine parameters and the preset third back-pressure steam pressure, determine the third energy efficiency evaluation result of the target back-pressure steam turbine;

[0018] Judge whether the third energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, then determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset third back-pressure steam pressure.

[0019] Furthermore, if the steam pressure determination request includes: first steam turbine parameters, external heat supply, and a preset first back-pressure steam pressure, then determining the first back-pressure heat supply according to the first steam turbine parameters and the preset first back-pressure steam pressure includes:

[0020] According to a preset curve of steam temperature varying with steam pressure drop, determine the first back-pressure temperature corresponding to the preset first back-pressure steam pressure;

[0021] According to the first back-pressure steam pressure and the first back-pressure temperature, determine the first back-pressure steam enthalpy value;

[0022] According to the first back-pressure steam enthalpy value, the back-pressure steam flow rate and the return water enthalpy value in the first steam turbine parameters, determine the first back-pressure heat supply.

[0023] Furthermore, the method for determining the steam pressure of the back-pressure steam turbine further includes:

[0024] If the steam pressure determination request includes: a second steam turbine parameter and a preset first main steam pressure, then according to the second steam turbine parameter and the preset first main steam pressure, determine a fourth energy efficiency evaluation result of the target back-pressure steam turbine;

[0025] Judge whether the fourth energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine that the main steam pressure of the target back-pressure steam turbine is the preset first main steam pressure.

[0026] Further, the method for determining the steam pressure of the back-pressure steam turbine further includes:

[0027] If the fourth energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, then according to the second steam turbine parameter and a preset second main steam pressure, determine a fifth energy efficiency evaluation result of the target back-pressure steam turbine, where the preset second main steam pressure is greater than the preset first main steam pressure;

[0028] Judge whether the fifth energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine that the main steam pressure of the target back-pressure steam turbine is the preset second main steam pressure.

[0029] In a second aspect, the present application provides a device for determining the steam pressure of a back-pressure steam turbine, including:

[0030] A receiving module, configured to receive a steam pressure determination request of a target back-pressure steam turbine;

[0031] A first determination module, configured to if the steam pressure determination request includes: a first steam turbine parameter, an externally supplied heat quantity, and a preset first back-pressure steam pressure, then according to the first steam turbine parameter and the preset first back-pressure steam pressure, determine a first back-pressure heat supply quantity;

[0032] A first judgment module, configured to judge whether the first back-pressure heat supply quantity is greater than or equal to the externally supplied heat quantity. If so, according to the first steam turbine parameter and the preset first back-pressure steam pressure, determine a first energy efficiency evaluation result of the target back-pressure steam turbine;

[0033] A first control module, configured to judge whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine that the back-pressure steam pressure of the target back-pressure steam turbine is the preset first back-pressure steam pressure.

[0034] Further, the device for determining the steam pressure of the back-pressure steam turbine further includes:

[0035] A second determination module, configured to determine a second backpressure heat supply amount according to the first steam turbine parameter and a preset second backpressure steam pressure if the first backpressure heat supply amount is less than the external heat supply amount, where the preset second backpressure steam pressure is greater than the preset first backpressure steam pressure;

[0036] A second judgment module, configured to judge whether the second backpressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine a second energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset second backpressure steam pressure;

[0037] A second control module, configured to judge whether the second energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset second backpressure steam pressure.

[0038] Further, the steam pressure determination device of the backpressure steam turbine further includes:

[0039] A third determination module, configured to determine a third backpressure heat supply amount according to the first steam turbine parameter and a preset third backpressure steam pressure if the first energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, where the preset third backpressure steam pressure is less than the preset first backpressure steam pressure;

[0040] A third judgment module, configured to judge whether the third backpressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine a third energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset third backpressure steam pressure;

[0041] A third control module, configured to judge whether the third energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset third backpressure steam pressure.

[0042] Further, the first determination module includes:

[0043] A first determination unit, configured to determine a first backpressure temperature corresponding to the preset first backpressure steam pressure according to a preset curve of steam temperature varying with steam pressure drop;

[0044] A second determination unit, configured to determine a first backpressure steam enthalpy value according to the first backpressure steam pressure and the first backpressure temperature;

[0045] A third determination unit, configured to determine the first backpressure heat supply amount according to the first backpressure steam enthalpy value, the backpressure steam flow rate and the return water enthalpy value in the first steam turbine parameter;

[0046] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steam pressure determination method of the backpressure steam turbine as described above is implemented.

[0047] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer instruction is stored. When the instruction is executed, the steam pressure determination method of the backpressure steam turbine as described above is implemented.

[0048] As can be seen from the above technical solutions, the present application provides a method and device for determining the steam pressure of a backpressure steam turbine. Among them, the method includes: receiving a steam pressure determination request for a target backpressure steam turbine; if the steam pressure determination request includes: a first steam turbine parameter, an external heat supply amount, and a preset first backpressure steam pressure, then determine a first backpressure heat supply amount according to the first steam turbine parameter and the preset first backpressure steam pressure; determine whether the first backpressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine a first energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset first backpressure steam pressure; determine whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset first backpressure steam pressure, which can improve the overall efficiency and reliability of the backpressure steam turbine, and further improve the economic efficiency of the operation of the backpressure steam turbine; the overall energy efficiency of the backpressure steam turbine can be improved by applying a reasonable steam pressure. Description of the Drawings

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 is a logical schematic diagram of a backpressure steam turbine system in the prior art;

[0051] Figure 2 is another logical schematic diagram of a backpressure steam turbine system in the prior art;

[0052] Figure 3 is a first flow schematic diagram of the steam pressure determination method of the backpressure steam turbine in the embodiment of the present application;

[0053] Figure 4 is a second flow schematic diagram of the steam pressure determination method of the backpressure steam turbine in the embodiment of the present application;

[0054] Figure 5 It is the third process schematic diagram of the steam pressure determination method for the backpressure steam turbine in the embodiment of the present application;

[0055] Figure 6 It is the fourth process schematic diagram of the steam pressure determination method for the backpressure steam turbine in the embodiment of the present application;

[0056] Figure 7 It is the first process schematic diagram of the steam pressure determination method for the backpressure steam turbine in the application example of the present application;

[0057] Figure 8 It is the first process schematic diagram of the steam pressure determination method for the backpressure steam turbine in the application example of the present application;

[0058] Figure 9 It is the structural schematic diagram of the steam pressure determination device for the backpressure steam turbine in the embodiment of the present application;

[0059] Figure 10 It is the system composition schematic block diagram of the electronic device in the embodiment of the present application. Detailed implementation manners

[0060] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0061] Figure 1 The backpressure steam turbine system in [reference] is a high-parameter backpressure steam turbine system in the prior art. Currently, there is also another small backpressure steam turbine system, such as Figure 2 As shown, this small backpressure steam turbine system does not have a high-pressure cylinder HP, and the small backpressure steam turbine system is actually closer to a direct heating small unit.

[0062] Currently, coal-fired cogeneration units mainly use the power supply coal consumption or the overall efficiency of the unit to evaluate their energy efficiency. However, in this process, the heat part efficiency for heating is directly regarded as 100% without considering the difference in energy levels of the heating part, giving an illusion that as long as there is cogeneration, the overall efficiency of the unit can be improved, and the larger the heating part of the cogeneration, the higher the energy efficiency level of the cogeneration unit. For example, in this theoretical system, the energy efficiency level of a small back-pressure heating cogeneration unit with a capacity of 5,000 kW will far exceed that of a ultra-supercritical large unit with a capacity of 1 million kW, which is an absurd conclusion. At the same time, the current energy efficiency evaluation of the energy used for power generation and heating in a back-pressure steam turbine completely ignores the energy level. Therefore, the overall efficiency of the back-pressure steam turbine, regardless of its parameter level, is close to 90% (about 10% is the loss of the boiler). However, considering that the energy level of producing electric energy is much greater than the energy level of the heating part of the back-pressure steam turbine, if the proportion of the heating part of the back-pressure steam turbine is too large, it is not the most economical way of energy utilization. The key to the demarcation of the energy for power production and heating in the back-pressure steam turbine lies in the specific conditions of the main steam parameters of the turbine and the pressure of the back-pressure steam used for heating. According to the sharing law of the energy for power production and heating between the two (main steam pressure and back-pressure), and its impact on the overall energy efficiency, this solution proposes a criterion for the overall energy efficiency level to be greater than that of pure power production to determine the steam pressure, which can enable the back-pressure steam turbine to truly operate under the optimal economic conditions.

[0063] In order to improve the overall efficiency and reliability of the back-pressure steam turbine, and further improve the economy of the operation of the back-pressure steam turbine, the embodiment of the present application provides a device for determining the steam pressure of a back-pressure steam turbine. The device can be a server or a client device. The client device can include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, and a smart wearable device, etc. Among them, the smart wearable device can include smart glasses, smart watches, and smart bracelets, etc.

[0064] In practical applications, the part for determining the steam pressure of the back-pressure steam turbine can be executed on the server side as described above, or all operations can be completed in the client device. Specifically, it can be selected according to the processing capacity of the client device and the limitations of the user's usage scenario, etc. The present application does not make any limitations in this regard. If all operations are completed in the client device, the client device may further include a processor.

[0065] The above-mentioned client device may have a communication module (i.e., communication unit), which can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, it may also include a server of an intermediate platform, such as a server of a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster composed of multiple servers, or a server structure of a distributed device.

[0066] Any suitable network protocol can be used for communication between the server and the client device, including network protocols that have not been developed as of the filing date of this application. The network protocol may, for example, include TCP / IP protocol, UDP / IP protocol, HTTP protocol, HTTPS protocol, etc. Of course, the network protocol may also, for example, include the RPC protocol (Remote Procedure Call Protocol) and REST protocol (Representational State Transfer) used on top of the above-mentioned protocols.

[0067] Specifically, it will be described through the following various embodiments.

[0068] In order to improve the overall efficiency and reliability of a backpressure steam turbine, and further improve the economy of the operation of the backpressure steam turbine, this embodiment provides a method for determining the steam pressure of a backpressure steam turbine, the execution subject of which is a steam pressure determination device of a backpressure steam turbine. The steam pressure determination device of the backpressure steam turbine includes, but is not limited to, a server, such as Figure 3 As shown, the method specifically includes the following content:

[0069] Step 301: Receive a steam pressure determination request for a target backpressure steam turbine.

[0070] Specifically, the steam pressure determination device may receive an initial steam pressure sent by the front end; the initial steam pressure may be an initial main steam pressure or an initial backpressure steam pressure.

[0071] Step 302: If the steam pressure determination request includes: a first steam turbine parameter, an external heat supply, and a preset first backpressure steam pressure, then determine a first backpressure heat supply according to the first steam turbine parameter and the preset first backpressure steam pressure.

[0072] Specifically, the external heat supply of the target back-pressure steam turbine can be measured; the first steam turbine parameters may include: the current main steam pressure, back-pressure steam flow rate, return water enthalpy value, feed water enthalpy value, hot section enthalpy value of the reheated steam, cold section enthalpy value of the reheated steam, extraction steam enthalpy value, main steam flow rate, reheater flow rate, extraction steam flow rate, extraction steam pressure, boiler efficiency, pipeline efficiency, and unit power generation of the target back-pressure steam turbine, etc.; the first back-pressure heat supply can represent the back-pressure heat supply determined according to the first steam turbine parameters and the preset first back-pressure steam pressure when the steam pressure determination request is the back-pressure steam pressure determination request.

[0073] Specifically, the preset first back-pressure steam pressure can be set in advance according to actual needs, and this application does not limit it; the back-pressure temperature corresponding to the back-pressure can be determined according to the preset curve of steam temperature varying with steam pressure drop T = g(p); the back-pressure steam pressure P bk and the back-pressure temperature T bk can be substituted into the formula H bk = f(P bk , T bk ) to determine the back-pressure steam enthalpy value, and this formula can be obtained from the "International Association for the Properties of Water and Steam (IAPWS) Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam"; the back-pressure heat supply Q bk can be determined according to the back-pressure steam enthalpy value H bk , the back-pressure steam flow rate D in the steam turbine parameters wb and the return water enthalpy value H bk substituting into the formula Q bk = D bk (H wb - H bk ).

[0074] Step 303: Determine whether the first back-pressure heat supply is greater than or equal to the external heat supply. If so, determine the first energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameters and the preset first back-pressure steam pressure.

[0075] Specifically, the plant power consumption rate L cyf for the power supply process of the back-pressure steam turbine can be determined according to the formula L cyb = lp(p) + L cyf , where lp(p) represents the curve of the plant power consumption rate of the feed water pump of the back-pressure steam turbine varying with the main steam pressure, which is determined by the steam turbine manufacturer or fitted according to the characteristics of the formed pump; L cyb represents the total plant power consumption rate of the auxiliary equipment on the boiler side of the back-pressure steam turbine; therefore, the main steam pressure in the first steam turbine parameters and the total plant power consumption rate of the auxiliary equipment on the boiler side can be substituted into the formula L cyf = lp(p) + L cyb, determine the electricity consumption rate of the branch factory for the power supply process; when the first energy efficiency evaluation result indicates that the steam pressure determination request is a back-pressure steam pressure determination request, it is the energy efficiency evaluation result determined according to the first steam turbine parameters and the preset first back-pressure steam pressure.

[0076] According to the preset curve of steam temperature varying with steam pressure drop T = g(p), the main steam temperature corresponding to the main steam pressure in the first steam turbine parameters can be determined; the main steam pressure P sm and the main steam temperature T sm can be substituted into the formula H sm = f(P sm , T sm ) to determine the main steam enthalpy value, and this formula can be obtained by calculating according to the formula IAPWS IF97 provided by the standard "International Thermophysical Properties of Industrial Water and Steam".

[0077] According to the electricity consumption rate of the branch factory for the power supply process, the main steam enthalpy value, the feed water enthalpy value in the first steam turbine parameters, the enthalpy value of the hot reheat steam section, the enthalpy value of the cold reheat steam section, the extraction steam enthalpy value, the main steam flow rate, the re-heater flow rate, the extraction steam flow rate, the boiler efficiency, the pipeline efficiency and the unit power generation, the power supply coal consumption of the back-pressure steam turbine can be determined.

[0078] According to the back-pressure steam enthalpy value, the back-pressure steam flow rate in the first steam turbine parameters, the condensate enthalpy value of the heat network heater, the main steam enthalpy value, the feed water enthalpy value, the enthalpy value of the hot reheat steam section, the enthalpy value of the cold reheat steam section, the main steam flow rate and the re-heater flow rate, the heat supply ratio of the heat supply process of the back-pressure steam turbine can be determined.

[0079] According to the power supply coal consumption, the heat supply ratio of the heat supply process, the electricity consumption rate of the branch factory for the power supply process and the extraction steam pressure in the first steam turbine parameters, the energy recovery ratio of the back-pressure steam turbine can be determined.

[0080] Among them, the energy efficiency evaluation result, that is, the energy recovery ratio, refers to the energy recovery ratio based on the electric energy level to measure the overall performance of the cogeneration unit. In essence, it is an energy efficiency ratio, which can be defined as the ratio of the recovered energy of the cogeneration to the input heat and the electric energy converted from the same steam parameters.

[0081] Specifically, 1) According to the following formula:

[0082] COP H = α E COP E + α BK COP BK

[0083]

[0084]

[0085]

[0086] α E = 1 - α BK

[0087] Determine the overall energy recovery ratio COP of the back-pressure steam turbine H :

[0088]

[0089] where α E represents the heat supply ratio of the power generation process corresponding to the back-pressure steam turbine; α BK represents the heat supply ratio of the steam heat supply process; COP E represents the energy recovery ratio of the power generation process; COP BK represents the energy recovery ratio of the steam heat supply process; COP nE represents the energy recovery ratio of the reverse cycle of the pure power generation process; η s,r represents the extraction efficiency of the back-pressure steam; L cyr represents the power consumption rate of the branch factory for heat supply.

[0090] 2) If the back-pressure steam turbine is a non-reheat and non-extraction unit, then:

[0091]

[0092]

[0093] If the back-pressure steam turbine is a unit with reheat and extraction, then:

[0094]

[0095]

[0096] where H sm represents the main steam enthalpy value, H fw represents the feed water enthalpy value, H rhh represents the enthalpy value of the hot section of the reheat steam, H rhc represents the enthalpy value of the cold section of the reheat steam, H ds represents the extraction steam enthalpy value, D sm represents the main steam flow rate, D rh represents the re-heater flow rate, D ds represents the extraction steam flow rate, η B represents the boiler efficiency, η P represents the pipeline efficiency, W E represents the power generation of the unit and L cyf represents the power consumption rate of the branch factory for the power supply process in the power consumption rate of the factory; D BKIndicates the backpressure steam flow rate, H BK Indicates the backpressure steam enthalpy value, H BW Indicates the condensate enthalpy value of the heat network heater (i.e., the enthalpy value when the exhaust steam condenses into water, the return water enthalpy value), H sm Indicates the main steam enthalpy value, H fw Indicates the feed water enthalpy value, H rhh Indicates the enthalpy value of the hot section of the reheater steam, H rhc Indicates the enthalpy value of the cold section of the reheater steam, D sm Indicates the main steam flow rate and D rh Indicates the reheater flow rate.

[0097] 3) According to the existing heat balance diagram, the extraction efficiency at different extraction positions of the reference steam turbine with a heat consumption rate of 7721 kJ / kWh can be obtained; the extraction pressures and extraction efficiencies corresponding to the third-stage extraction to the eighth-stage extraction in the reference steam turbine can be fitted to obtain the corresponding relationship between the extraction pressure and the extraction efficiency:

[0098] η DS = 6.20ln(P DS ) + 29.81

[0099] Among them, η DS Indicates the extraction efficiency; P DS Indicates the extraction pressure, which refers to the pressure of the backpressure steam in the backpressure steam turbine system, unit: MPa.

[0100] Step 304: Determine whether the first energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine that the backpressure steam pressure of the target backpressure steam turbine is the preset first backpressure steam pressure.

[0101] Specifically, the backpressure steam pressure of the target backpressure steam turbine can be adjusted to the preset first backpressure steam pressure for operation to improve the economic efficiency of the operation of the target backpressure steam turbine.

[0102] To avoid insufficient heating capacity of the backpressure steam turbine and affecting the energy efficiency of the backpressure steam turbine, see Figure 4 , in an embodiment of the present application, after step 302, it further includes:

[0103] Step 401: If the first backpressure heating supply is less than the external heating supply, determine the second backpressure heating supply according to the first steam turbine parameters and the preset second backpressure steam pressure, and the preset second backpressure steam pressure is greater than the preset first backpressure steam pressure.

[0104] Specifically, the preset second back-pressure steam pressure is greater than the preset first back-pressure steam pressure. The specific value of the second back-pressure steam pressure can be set according to the actual situation, and the present application does not limit this; the second back-pressure heat supply can represent the back-pressure heat supply determined according to the first steam turbine parameter and the preset second back-pressure steam pressure when the steam pressure determination request is a back-pressure steam pressure determination request.

[0105] Step 402: Determine whether the second back-pressure heat supply is greater than or equal to the externally supplied heat. If so, determine the second energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset second back-pressure steam pressure.

[0106] Specifically, the second energy efficiency evaluation result can represent the energy efficiency evaluation result determined according to the first steam turbine parameter and the preset second back-pressure steam pressure when the steam pressure determination request is a back-pressure steam pressure determination request.

[0107] Step 403: Determine whether the second energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset second back-pressure steam pressure.

[0108] Specifically, for the processing flow after determining that the first back-pressure heat supply is less than the externally supplied heat, reference can be made to the detailed descriptions of steps 302 to 304 in the above-mentioned embodiment.

[0109] To solve the problem of low energy efficiency of the back-pressure steam turbine, refer to Figure 5 , in an embodiment of the present application, after step 303, it further includes:

[0110] Step 501: If the first energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, determine the third back-pressure heat supply according to the first steam turbine parameter and the preset third back-pressure steam pressure, where the preset third back-pressure steam pressure is less than the preset first back-pressure steam pressure.

[0111] Specifically, the preset third back-pressure steam pressure is less than the preset first back-pressure steam pressure. The specific value of the third back-pressure steam pressure can be set according to the actual situation, and the present application does not limit this; the third back-pressure heat supply can represent the back-pressure heat supply determined according to the first steam turbine parameter and the preset third back-pressure steam pressure when the steam pressure determination request is a back-pressure steam pressure determination request.

[0112] When the back pressure of the back-pressure steam turbine increases, its power generation capacity drops rapidly, and at this time, the economic efficiency of combined heat and power generation is relatively low. In an example, as shown in Table 1:

[0113] Table 1

[0114] <![CDATA[Backpressure steam pressure P bk > <![CDATA[Extraction efficiency η BK > This part is for the energy recovery ratio COP during steam heating 0.5 MPa 4.92％ 3.96 1.28 MPa 31.25％ 3.23 2.28 MPa 34.92％ 2.89

[0115] It can be seen that when the back pressure of a back-pressure steam turbine increases, although its heat supply capacity increases, its economy decreases; the reason is that when supplying heat, not only low-grade heat such as latent heat of vaporization is utilized, but also high-grade heat is utilized. Therefore, it is necessary to accurately determine the steam parameters of the back-pressure steam turbine, including two cases: determining the back-pressure parameter according to the known main steam parameters and determining the main steam parameters according to the known back-pressure parameters; the energy recovery ratio COP of the back-pressure steam turbine can be adjusted by adjusting the back pressure (making it as low as possible) or adjusting the main steam pressure (making it as high as possible), so that the energy recovery ratio of the current back-pressure steam turbine is greater than the COP of pure power generation, and the energy recovery ratio can be equivalent to the energy efficiency.

[0116] Step 502: Determine whether the third back-pressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine the third energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset third back-pressure steam pressure.

[0117] Specifically, the third energy efficiency evaluation result can represent the energy efficiency evaluation result determined according to the first steam turbine parameter and the preset third back-pressure steam pressure when the steam pressure determination request is a back-pressure steam pressure determination request.

[0118] Step 503: Determine whether the third energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset third back-pressure steam pressure.

[0119] Specifically, for the processing flow after determining that the first energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, reference can be made to the detailed descriptions of steps 302 to 304 in the above embodiment.

[0120] In order to further improve the accuracy of the back-pressure heat supply amount and thus improve the reliability of back-pressure control, refer to Figure 6 , in an embodiment of the present application, step 302 includes:

[0121] Step 601: Determine the first back-pressure temperature corresponding to the preset first back-pressure steam pressure according to the preset curve of steam temperature varying with steam pressure drop.

[0122] Step 602: Determine the first back-pressure steam enthalpy value according to the first back-pressure steam pressure and the first back-pressure temperature.

[0123] Step 603: Determine the first back-pressure heat supply amount according to the first back-pressure steam enthalpy value, the back-pressure steam flow rate in the first steam turbine parameter, and the return water enthalpy value.

[0124] Specifically, the back-pressure heat supply amount can be determined according to the following formula:

[0125] Q bk = D bk (H bk - H wb )

[0126] Wherein, Q bk represents the back pressure heat supply quantity, D bk represents the back pressure steam flow rate, H bk represents the back pressure steam enthalpy value, and H wb represents the return water enthalpy value.

[0127] To improve the accuracy of controlling the main steam pressure, in an embodiment of the present application, after step 301, it further includes:

[0128] If the steam pressure determination request includes: the second steam turbine parameter and a preset first main steam pressure, then according to the second steam turbine parameter and the preset first main steam pressure, determine the fourth energy efficiency evaluation result of the target back pressure steam turbine; determine whether the fourth energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold, if so, determine the main steam pressure of the target back pressure steam turbine as the preset first main steam pressure.

[0129] Specifically, the second steam turbine parameter may include: the current back pressure steam pressure, back pressure steam flow rate, return water enthalpy value, extraction steam pressure, feed water enthalpy value, hot section enthalpy value of the reheater steam, cold section enthalpy value of the reheater steam, extraction steam enthalpy value, main steam flow rate, reheater flow rate, extraction steam flow rate, boiler efficiency, pipeline efficiency, and unit power generation of the target back pressure steam turbine, etc.; the specific value of the preset first main steam pressure can be set according to the actual situation, and the present application does not limit this. The fourth energy efficiency evaluation result may represent the energy efficiency evaluation result determined according to the second steam turbine parameter and the preset first main steam pressure when the steam pressure determination request is a main steam pressure determination request.

[0130] To improve the accuracy of controlling the main steam pressure, in an embodiment of the present application, the steam pressure determination method further includes: if the fourth energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, then according to the second steam turbine parameter and a preset second main steam pressure, determine the fifth energy efficiency evaluation result of the target back pressure steam turbine, and the preset second main steam pressure is greater than the preset first main steam pressure; determine whether the fifth energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold, if so, determine the main steam pressure of the target back pressure steam turbine as the preset second main steam pressure.

[0131] Specifically, the specific value of the preset second main steam pressure can be set according to the actual situation, and this application does not limit it. The fifth energy efficiency evaluation result can represent the energy efficiency evaluation result determined according to the second steam turbine parameters and the preset second main steam pressure when the steam pressure determination request is the main steam pressure determination request.

[0132] To further illustrate this solution, this application provides an application example of the back pressure determination method for a back pressure steam turbine, which is specifically described as follows:

[0133] 1) Receive a steam pressure determination request. If the steam pressure determination request is a back pressure steam pressure determination request, determine the back pressure parameter according to the known main steam parameters:

[0134] Pre-obtain the external heat supply Q of the back pressure steam turbine hp , the main steam flow rate D sm and the condensate water temperature T of the heat network heater wb and other parameters. For example, assume the main steam pressure P sm = 9MP, and the main steam temperature T sm = 540 °C. According to the law of work done by each stage of blades of the preset back pressure steam turbine, the back pressure parameter of the back pressure steam turbine can be determined, which is specifically described as follows:

[0135] Step 011: Obtain the change curve of steam temperature with steam pressure drop T = g(p). The curve of steam temperature with steam pressure drop T = g(p) is used by the steam turbine manufacturer in the design and is related to the performance of each stage of the steam turbine. If the steam turbine manufacturer does not provide this data, it can be fitted according to the temperature and pressure relationship of each stage of steam extraction of the steam turbine.

[0136] Step 012: Obtain the relationship curve L cyf = lp(p) + L cyb , where L cyb is the total plant power consumption rate of the auxiliary equipment on the boiler side, which is independent of the main steam pressure and can be set as a fixed value. lp(p) is the curve of the plant power consumption rate of the water pump on the steam turbine side changing with the main steam pressure of the back pressure steam turbine, which is determined by the steam turbine manufacturer or fitted according to the characteristics of the formed pump.

[0137] Step 013: Assume the initial value of the back pressure steam pressure of the back pressure steam turbine is P bk = 1MP. According to the change curve of steam temperature with steam pressure drop T = g(p), determine the exhaust steam temperature T bk of the back pressure steam turbine; the exhaust steam enthalpy value H bk = f(P bk , T bk),The current characteristics of water and steam generally refer to the "IAPWS IF97 - Industrial Formulation for the Thermophysical Properties of Water and Steam", and its enthalpy value can be determined according to temperature and pressure, or the temperature can be determined according to the enthalpy value and pressure.

[0138] Judge whether the heat supply meets Q bk = D bk (H bk - H wb )≥Q HP , if not, return to the first step to change the extraction steam pressure P bk , until the extraction steam pressure meets the heating requirements.

[0139] Step 014: Determine the plant power consumption rate, power supply coal consumption, and heating ratio.

[0140] The plant power consumption rate includes: the power consumption of auxiliary equipment on the boiler side such as fans and coal mills, and the power consumption of the feed water pump on the steam turbine side; in this application example, the plant power consumption rate is calculated at 4%, and the plant power consumption rate for heating is considered at 1%.

[0141] According to the equipment conditions of the steam turbine stage, determine the unit power supply coal consumption and heating ratio:

[0142] For a back - pressure steam turbine without reheat and without extraction:

[0143]

[0144]

[0145] For a back - pressure steam turbine with reheat and with extraction:

[0146]

[0147]

[0148] The boiler efficiency η B 、the pipeline efficiency η P 、the unit power generation W E 、the plant power consumption L cyf are determined according to DL / T 904, or can also be determined according to the design data. If it is the design selection stage, it can also be calculated according to the design parameters of the unit, so:

[0149]

[0150] Among them, the overall efficiency η of the steam turbine power generation part TEIndicates the part of each stage of the steam turbine that converts the enthalpy drop of steam into electrical energy, including overall factors such as inter-stage steam leakage effect, mechanical efficiency, generator efficiency, heat dissipation, etc. Usually, this efficiency can reach more than 80%, which is provided by the steam turbine manufacturer. If the boiler efficiency, pipeline efficiency, overall efficiency of the power generation part of the steam turbine unit, and plant power consumption rate are assumed to be 92%, 99%, 80%, and 5% respectively, then the power supply coal consumption of this back-pressure steam turbine is:

[0151]

[0152] Step 014: Determine the energy recovery ratio COP of the unit according to the back pressure P bk , power supply coal consumption and heat supply ratio. Check whether it is greater than a preset energy recovery ratio value (such as 3.8); if the requirement is met, output the result, otherwise, lower the extraction steam pressure parameter and return to step 011 to execute again until the energy recovery ratio is greater than the preset value; finally, a back pressure that meets the heat supply requirements and energy efficiency level can be obtained.

[0153] 2) Receive a steam pressure determination request. If the steam pressure determination request is a main steam pressure determination request, the main steam parameters that meet the energy efficiency requirements can be determined according to the known back pressure, mainly the pressure condition. Starting from the pre-assumed main steam pressure, this main steam pressure is usually provided by the steam turbine manufacturer. Currently, the parameters are often relatively low, so it is necessary to check whether the main steam pressure condition is too low, resulting in low overall energy efficiency. If it is low, just increase the main steam pressure parameter; the lowest main steam parameters that meet the heat supply requirements and energy efficiency level requirements can be obtained.

[0154] To further illustrate this solution, as Figure 7 and Figure 8 shown, this application also provides an application example of a steam pressure determination method for a back-pressure steam turbine, which is specifically described as follows:

[0155] S701: Obtain the main steam parameters and assume the back-pressure steam pressure; S702: Determine the back-pressure steam temperature, back-pressure steam enthalpy value, and the plant power consumption rate for the power supply process; S703: Determine the heat supply; S704: Judge whether the back-pressure heat supply is greater than or equal to the external heat supply. If so, execute step S705, otherwise execute step S708; S705: Calculate the heat supply ratio, power supply coal consumption, and the corresponding energy recovery ratio COP H ; S706: Judge whether COP H is greater than or equal to the preset COP. If so, output the result, otherwise, execute step S707; S707: The energy efficiency is insufficient. Lower the back-pressure steam pressure p bk = 0.5p bk , and return to execute step S702; S708: The heat supply capacity is insufficient. Increase the back-pressure steam pressure p bk = 0.5(pbk +P sm ) and return to execute step S702.

[0156] S801: Obtain the back pressure and assume the main steam pressure; S802: Determine the main steam temperature, the main steam enthalpy value, and the auxiliary power consumption rate of the branch factory for the power supply process; S803: Determine the heat supply amount; S804: Calculate the heat supply ratio, the coal consumption for power generation, and the corresponding energy recovery ratio; S805: Judge whether the COP H is greater than or equal to the preset COP. If so, output the result; otherwise, execute step S806; S806: The energy efficiency is insufficient. Increase the main steam pressure step by step and return to execute step S802.

[0157] From the software level, in order to improve the overall efficiency and reliability of the back-pressure steam turbine, and further improve the economic efficiency of the operation of the back-pressure steam turbine, this application provides an embodiment of a device for determining the steam pressure of a back-pressure steam turbine that implements all or part of the content in the method for determining the steam pressure of the back-pressure steam turbine. See Figure 9 that the device for determining the steam pressure of the back-pressure steam turbine specifically includes the following content:

[0158] A receiving module 91, configured to receive a request for determining the steam pressure of a target back-pressure steam turbine;

[0159] A first determination module 92, configured to, if the steam pressure determination request includes: first steam turbine parameters, the externally supplied heat amount, and a preset first back-pressure steam pressure, determine the first back-pressure heat supply amount according to the first steam turbine parameters and the preset first back-pressure steam pressure;

[0160] A first judgment module 93, configured to judge whether the first back-pressure heat supply amount is greater than or equal to the externally supplied heat amount. If so, determine the first energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameters and the preset first back-pressure steam pressure;

[0161] A first control module 94, configured to judge whether the first energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset first back-pressure steam pressure.

[0162] In an embodiment of this application, the device for determining the steam pressure of the back-pressure steam turbine further includes:

[0163] A second determination module, configured to, if the first back-pressure heat supply amount is less than the externally supplied heat amount, determine the second back-pressure heat supply amount according to the first steam turbine parameters and a preset second back-pressure steam pressure, where the preset second back-pressure steam pressure is greater than the preset first back-pressure steam pressure;

[0164] A second judgment module, configured to judge whether the second back-pressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine a second energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and a preset second back-pressure steam pressure;

[0165] A second control module, configured to judge whether the second energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset second back-pressure steam pressure.

[0166] In an embodiment of the present application, the steam pressure determination device of the back-pressure steam turbine further includes:

[0167] A third determination module, configured to, if the first energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, determine a third back-pressure heat supply amount according to the first steam turbine parameter and a preset third back-pressure steam pressure, where the preset third back-pressure steam pressure is less than the preset first back-pressure steam pressure;

[0168] A third judgment module, configured to judge whether the third back-pressure heat supply amount is greater than or equal to the external heat supply amount. If so, determine a third energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset third back-pressure steam pressure;

[0169] A third control module, configured to judge whether the third energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset third back-pressure steam pressure.

[0170] In an embodiment of the present application, the first determination module includes:

[0171] A first determination unit, configured to determine a first back-pressure temperature corresponding to the preset first back-pressure steam pressure according to a preset steam temperature change curve with respect to steam pressure drop;

[0172] A second determination unit, configured to determine a first back-pressure steam enthalpy value according to the first back-pressure steam pressure and the first back-pressure temperature;

[0173] A third determination unit, configured to determine the first back-pressure heat supply amount according to the first back-pressure steam enthalpy value, the back-pressure steam flow rate and the return water enthalpy value in the first steam turbine parameter;

[0174] The embodiments of the steam pressure determination device of the back-pressure steam turbine provided in this specification can specifically be used to execute the processing procedures of the embodiments of the above-mentioned steam pressure determination method of the back-pressure steam turbine. Its functions will not be elaborated here, and reference can be made to the detailed description of the embodiments of the above-mentioned steam pressure determination method of the back-pressure steam turbine.

[0175] At the hardware level, in order to improve the overall efficiency and reliability of a back-pressure steam turbine, and thus improve the economy of the operation of the back-pressure steam turbine, the present application provides an embodiment of an electronic device for implementing all or part of the content in the steam pressure determination method of the back-pressure steam turbine. The electronic device specifically includes the following:

[0176] A processor, a memory, a communications interface, and a bus; wherein, the processor, the memory, and the communications interface complete communication with each other through the bus; the communications interface is used to implement information transmission between related devices such as the steam pressure determination device of the back-pressure steam turbine and the user terminal, etc. This electronic device can be a desktop computer, a tablet computer, a mobile terminal, etc., and this embodiment is not limited thereto. In this embodiment, this electronic device can be implemented with reference to the embodiments for implementing the steam pressure determination method of the back-pressure steam turbine and the embodiments for implementing the steam pressure determination device of the back-pressure steam turbine, and the content is incorporated herein, and the repeated parts will not be elaborated.

[0177] Figure 10 It is a schematic block diagram of the system composition of the electronic device 9600 according to an embodiment of the present application. As Figure 10 shown, the electronic device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. It should be noted that this Figure 10 is exemplary; other types of structures can also be used to supplement or replace this structure to achieve telecommunication functions or other functions.

[0178] In one or more embodiments of the present application, the steam pressure determination function of the back-pressure steam turbine can be integrated into the central processing unit 9100. Among them, the central processing unit 9100 can be configured to perform the following controls:

[0179] Step 301: Receive a steam pressure determination request for a target back-pressure steam turbine.

[0180] Step 302: If the steam pressure determination request includes: a first steam turbine parameter, an externally supplied heat quantity, and a preset first back-pressure steam pressure, then determine a first back-pressure heat supply quantity according to the first steam turbine parameter and the preset first back-pressure steam pressure.

[0181] Step 303: Determine whether the first back-pressure heat supply quantity is greater than or equal to the externally supplied heat quantity. If so, determine a first energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset first back-pressure steam pressure.

[0182] Step 304: Determine whether the first energy efficiency evaluation result is greater than or equal to the energy efficiency evaluation result threshold. If so, determine that the backpressure steam pressure of the target backpressure steam turbine is the preset first backpressure steam pressure.

[0183] As can be seen from the above description, the electronic device provided by the embodiment of the present application can improve the overall efficiency and reliability of the backpressure steam turbine, thereby improving the economy of the operation of the backpressure steam turbine.

[0184] In another embodiment, the steam pressure determination device of the backpressure steam turbine can be separately configured from the central processing unit 9100. For example, the steam pressure determination device of the backpressure steam turbine can be configured as a chip connected to the central processing unit 9100, and the steam pressure determination function of the backpressure steam turbine is realized through the control of the central processing unit.

[0185] As Figure 10 shown, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It should be noted that the electronic device 9600 does not necessarily have to include Figure 10 all the components shown in Figure 10 ; in addition, the electronic device 9600 may further include

[0186] As Figure 10 shown, the central processing unit 9100 is sometimes also called a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processing unit 9100 receives inputs and controls the operations of the various components of the electronic device 9600.

[0187] Among them, the memory 9140 can be, for example, one or more of a buffer, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, or other suitable devices. The above information related to failures can be stored, and in addition, programs for executing relevant information can also be stored. And the central processing unit 9100 can execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0188] The input unit 9120 provides inputs to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to supply power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display can be, for example, an LCD display, but is not limited thereto.

[0189] The memory 9140 may be a solid-state memory, for example, a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that stores information even when power is off, can be selectively erased and has more data. An example of this memory is sometimes referred to as an EPROM, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs or for storing the processes for operating the electronic device 9600 by the central processing unit 9100.

[0190] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers of the electronic device for communication functions and / or for performing other functions of the electronic device (such as a messaging application, an address book application, etc.).

[0191] The communication module 9110 is a transmitter / receiver 9110 that transmits and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processing unit 9100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.

[0192] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module, etc. The communication module (transmitter / receiver) 9110 is also coupled to the speaker 9131 and the microphone 9132 via the audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby implementing normal telecommunication functions. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. Additionally, the audio processor 9130 is also coupled to the central processing unit 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0193] As can be seen from the above description, the electronic device provided by the embodiments of the present application can improve the overall efficiency and reliability of the backpressure steam turbine, and further improve the economy of the operation of the backpressure steam turbine.

[0194] Embodiments of the present application also provide a computer-readable storage medium capable of implementing all steps in the steam pressure determination method of the backpressure steam turbine in the above embodiments. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, all steps in the steam pressure determination method of the backpressure steam turbine in the above embodiments are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0195] Step 301: Receive a steam pressure determination request for a target backpressure steam turbine.

[0196] Step 302: If the steam pressure determination request includes: a first steam turbine parameter, an externally supplied heat quantity, and a preset first backpressure steam pressure, then determine a first backpressure heat supply quantity according to the first steam turbine parameter and the preset first backpressure steam pressure.

[0197] Step 303: Determine whether the first backpressure heat supply quantity is greater than or equal to the externally supplied heat quantity. If so, determine a first energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset first backpressure steam pressure.

[0198] Step 304: Determine whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset first backpressure steam pressure.

[0199] As can be seen from the above description, the computer-readable storage medium provided by the embodiments of the present application can improve the overall efficiency and reliability of the backpressure steam turbine, and further improve the economy of the operation of the backpressure steam turbine.

[0200] The various embodiments of the above method in the present application are all described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. For the relevant parts, refer to the partial description of the method embodiment.

[0201] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0202] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to produce a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices produce means for implementing the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks.

[0203] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks.

[0204] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks.

[0205] Specific embodiments are applied in this application to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A method for determining the steam pressure of a back-pressure steam turbine, characterized in that, Including: Receiving a steam pressure determination request for a target back-pressure steam turbine; If the steam pressure determination request includes: a first steam turbine parameter, an externally supplied heat quantity, and a preset first back-pressure steam pressure, then determine a first back-pressure heat supply quantity according to the first steam turbine parameter and the preset first back-pressure steam pressure; Judge whether the first back-pressure heat supply quantity is greater than or equal to the externally supplied heat quantity. If so, determine a first energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset first back-pressure steam pressure; Judge whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset first back-pressure steam pressure; The determining the first energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset first back-pressure steam pressure includes: Determine the power supply coal consumption according to the plant power consumption rate for the power supply process, the main steam enthalpy value, the feed water enthalpy value, the hot section enthalpy value of the reheated steam, the cold section enthalpy value of the reheated steam, the extraction steam enthalpy value, the main steam flow rate, the reheater flow rate, the extraction steam flow rate, the boiler efficiency, the pipeline efficiency, and the unit power generation amount in the first steam turbine parameter; Determine the back-pressure steam enthalpy value according to the preset first back-pressure steam pressure; determine the heat supply ratio of the heat supply process according to the back-pressure steam enthalpy value, the back-pressure steam flow rate, the condensate enthalpy value of the heat network heater, the main steam enthalpy value, the feed water enthalpy value, the hot section enthalpy value of the reheated steam, the cold section enthalpy value of the reheated steam, the main steam flow rate, and the reheater flow rate in the first steam turbine parameter; Determine the first energy efficiency evaluation result according to the power supply coal consumption, the heat supply ratio of the heat supply process, the plant power consumption rate for the power supply process, and the extraction steam pressure in the first steam turbine parameter.

2. The method for determining the steam pressure of a backpressure steam turbine according to claim 1, wherein, Also including: If the first back-pressure heat supply quantity is less than the externally supplied heat quantity, then determine a second back-pressure heat supply quantity according to the first steam turbine parameter and a preset second back-pressure steam pressure, and the preset second back-pressure steam pressure is greater than the preset first back-pressure steam pressure; Judge whether the second back-pressure heat supply quantity is greater than or equal to the externally supplied heat quantity. If so, determine a second energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset second back-pressure steam pressure; Judge whether the second energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset second back-pressure steam pressure.

3. The method for determining the steam pressure of a back-pressure steam turbine according to claim 1, characterized in that, Also including: If the first energy efficiency evaluation result is less than the energy efficiency evaluation result threshold, then determine a third back-pressure heat supply quantity according to the first steam turbine parameter and a preset third back-pressure steam pressure, and the preset third back-pressure steam pressure is less than the preset first back-pressure steam pressure; Judge whether the third back-pressure heat supply quantity is greater than or equal to the externally supplied heat quantity. If so, determine a third energy efficiency evaluation result of the target back-pressure steam turbine according to the first steam turbine parameter and the preset third back-pressure steam pressure; Judge whether the third energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold. If so, determine the back-pressure steam pressure of the target back-pressure steam turbine as the preset third back-pressure steam pressure.

4. The method for determining the steam pressure of a backpressure steam turbine according to claim 1, characterized in that, If the steam pressure determination request includes: the first steam turbine parameter, the external heat supply amount, and the preset first backpressure steam pressure, then according to the first steam turbine parameter and the preset first backpressure steam pressure, determining the first backpressure heat supply amount includes: Determining a first backpressure temperature corresponding to the preset first backpressure steam pressure according to a preset curve of steam temperature varying with steam pressure drop; Determining a first backpressure steam enthalpy value according to the first backpressure steam pressure and the first backpressure temperature; Determining the first backpressure heat supply amount according to the first backpressure steam enthalpy value, the backpressure steam flow rate in the first steam turbine parameter, and the return water enthalpy value.

5. A steam pressure determination device for a back-pressure steam turbine, characterized in that Includes: A receiving module, configured to receive a steam pressure determination request of a target backpressure steam turbine; A first determination module, configured to, if the steam pressure determination request includes: the first steam turbine parameter, the external heat supply amount, and the preset first backpressure steam pressure, then determine a first backpressure heat supply amount according to the first steam turbine parameter and the preset first backpressure steam pressure; A first judgment module, configured to judge whether the first backpressure heat supply amount is greater than or equal to the external heat supply amount, and if so, determine a first energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset first backpressure steam pressure; A first control module, configured to judge whether the first energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold, and if so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset first backpressure steam pressure; The first judgment module is configured to: Determine the power supply coal consumption according to the plant power consumption rate for the power supply process, the main steam enthalpy value, the feed water enthalpy value in the first steam turbine parameter, the hot reheat steam enthalpy value, the cold reheat steam enthalpy value, the extraction steam enthalpy value, the main steam flow rate, the reheater flow rate, the extraction steam flow rate, the boiler efficiency, the pipeline efficiency, and the unit power generation amount; Determine a backpressure steam enthalpy value according to the preset first backpressure steam pressure; determine a heat supply ratio of the heat supply process according to the backpressure steam enthalpy value, the backpressure steam flow rate in the first steam turbine parameter, the condensate enthalpy value of the heat network heater, the main steam enthalpy value, the feed water enthalpy value, the hot reheat steam enthalpy value, the cold reheat steam enthalpy value, the main steam flow rate, and the reheater flow rate; Determine the first energy efficiency evaluation result according to the power supply coal consumption, the heat supply ratio of the heat supply process, the plant power consumption rate for the power supply process, and the extraction steam pressure in the first steam turbine parameter.

6. The steam pressure determining device of the backpressure steam turbine according to claim 5, characterized in that, Further includes: A second determination module, configured to, if the first backpressure heat supply amount is less than the external heat supply amount, then determine a second backpressure heat supply amount according to the first steam turbine parameter and a preset second backpressure steam pressure, where the preset second backpressure steam pressure is greater than the preset first backpressure steam pressure; A second judgment module, configured to judge whether the second backpressure heat supply amount is greater than or equal to the external heat supply amount, and if so, determine a second energy efficiency evaluation result of the target backpressure steam turbine according to the first steam turbine parameter and the preset second backpressure steam pressure; A second control module, configured to judge whether the second energy efficiency evaluation result is greater than or equal to an energy efficiency evaluation result threshold, and if so, determine the backpressure steam pressure of the target backpressure steam turbine as the preset second backpressure steam pressure.

7. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steam pressure determination method of the backpressure steam turbine according to any one of claims 1 to 4.

8. A computer-readable storage medium having computer instructions stored thereon, characterized in that, When the instruction is executed, it implements the steam pressure determination method of the backpressure steam turbine according to any one of claims 1 to 4.

Images