Control method and device of high-pressure steam source of small steam turbine and electronic equipment

Abstract

The present disclosure relates to a control method and device for a high-pressure steam source of a small steam turbine and an electronic device. The method comprises: acquiring a first inlet steam pressure parameter when the high-pressure steam source of the small steam turbine is only five-stage extraction steam in real time; determining whether the first inlet steam pressure corresponding to the first inlet steam pressure parameter is less than a preset pressure value; if it is determined that the first inlet steam pressure is less than the preset pressure value, controlling a high-pressure steam source switching valve to open; acquiring a second inlet steam pressure parameter corresponding to when mixed high-pressure steam is delivered to the small steam turbine via an inlet steam regulating valve, wherein the mixed high-pressure steam comprises five-stage extraction steam and cold re-extraction steam via the high-pressure steam source switching valve; and controlling the flow of the mixed high-pressure steam entering the small steam turbine in real time to control the small steam turbine in a stable operating state, wherein the stable operating state comprises that the second inlet steam pressure corresponding to the second inlet steam pressure parameter is within a pressure threshold range, and the rotating speed of the small steam turbine is within a preset rotating speed range.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of supercritical unit commissioning, in particular, to a control method and device for high-pressure steam source of a small steam turbine and an electronic device. BACKGROUND

[0002] With the development of deep peak shaving work of thermal power generating units, frequent changes in unit load have become the norm. In particular, when the thermal power generating unit is in a low load operation condition or a high heating condition, in order to ensure the safe and stable operation of the thermal power generating unit, the switching and adjustment of the high-pressure steam source of the small steam turbine need to meet the needs of the thermal power generating unit.

[0003] Currently, the high-pressure steam source of the small steam turbine includes five-stage extraction steam introduced from the eighth stage of the intermediate-pressure cylinder of the main steam turbine, auxiliary steam starting steam source, and high-pressure steam source of the cold re-supply steam pipeline. The main steam source of the small steam turbine is the five-stage extraction steam, and the pressure of the five-stage extraction steam changes with the change in the load of the thermal power generating unit. The MEH (Micro Electro-Hydraulic Control System) control logic provided by the pump turbine manufacturer controls the speed of the small steam turbine through the opening degree of the inlet valve, meets the requirements of the boiler feed water flow, that is, the five-stage extraction steam source and the high-pressure steam source switching valve are controlled in a "constant pressure" manner. When the thermal power generating unit is in a low load operation condition or a high heating condition, the pressure of the five-stage extraction steam decreases, and when the inlet valve is fully opened, the speed of the small steam turbine still cannot be met, and the high-pressure steam source switching valve needs to be opened, and the pressure after the high-pressure steam source switching valve is opened is controlled according to the preset inlet pressure set value. However, once the load of the thermal power generating unit changes, the inlet pressure set value needs to be manually reset, so that the control has a lag. SUMMARY

[0004] The purpose of the present disclosure is to provide a control method, device and electronic equipment for the high-pressure steam source of a small steam turbine to solve the problems in the related art.

[0005] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] In a first aspect, a control method for a high-pressure steam source of a small steam turbine is provided, and the method comprises:

[0007] a first inlet pressure parameter when the high-pressure steam source of the small steam turbine is only five-stage extraction steam is acquired in real time;

[0008] whether the first inlet pressure parameter corresponds to a first inlet pressure less than a preset pressure value is determined;

[0009] if it is determined that the first inlet pressure is less than the preset pressure value, the high-pressure steam source switching valve is controlled to be opened;

[0010] acquire a second inlet pressure parameter corresponding to the case that the mixed high-pressure steam source is delivered to the small steam turbine via the inlet regulating valve, wherein the mixed high-pressure steam source comprises five-stage extraction steam and cold re-extraction steam delivered via the high-pressure steam source switching valve;

[0011] real-time regulate the flow of the mixed high-pressure steam source into the small steam turbine to control the small steam turbine in a stable operation state, wherein the stable operation state comprises that the second inlet pressure parameter corresponds to a second inlet pressure within a pressure threshold range, and the rotating speed of the small steam turbine is within a preset rotating speed range, wherein the pressure threshold range is related to the inlet pressure set value.

[0012] Optionally, the real-time regulating the flow of the mixed high-pressure steam source into the small steam turbine comprises:

[0013] regulate the flow of the mixed high-pressure steam source into the small steam turbine according to a predetermined sliding pressure control curve of the inlet pressure set value and the feedwater flow, wherein the sliding pressure control curve is used to represent the corresponding relationship between the feedwater flow and the inlet pressure set value.

[0014] Optionally, the method further comprises:

[0015] when the feedwater flow is within a preset feedwater flow reverse tracking interval of the sliding pressure control curve, determine whether the current actual inlet pressure value is less than the inlet pressure set value corresponding to the current actual inlet pressure value;

[0016] if it is determined that the current actual inlet pressure value is less than the inlet pressure set value corresponding to the current actual inlet pressure value, control the inlet pressure value to increase until the current actual inlet pressure value reaches the inlet pressure set value corresponding to the current actual inlet pressure value.

[0017] Optionally, if it is determined that the current actual inlet pressure value is less than the inlet pressure set value corresponding to the current actual inlet pressure value, the control of the inlet pressure value to increase comprises:

[0018] determine whether the difference between the current actual inlet pressure value of the small steam turbine and the corresponding inlet pressure set value exceeds a first deviation preset value;

[0019] if it is determined that the difference between the current actual inlet pressure value of the small steam turbine and the corresponding inlet pressure set value exceeds the first deviation preset value, control the opening rising rate of the high-pressure steam source switching valve to increase to increase the opening rate of the high-pressure steam source switching valve.

[0020] Optionally, the method further comprises:

[0021] determine whether the opening of the inlet regulating valve exceeds a first preset opening;

[0022] If it is determined that the opening of the admission valve exceeds the first preset opening, a pressure setting correction value of the admission valve is calculated according to a first expression, wherein the first expression is:

[0023] ΔP = 0 + (IVO - 55%) * 0.015

[0024] In the formula, ΔP is used to represent the pressure setting correction value of the admission valve, and IVO is used to represent the opening of the admission valve.

[0025] The admission pressure setting value of the admission valve is adjusted according to the pressure setting correction value, and the admission valve opening is corrected according to the adjusted admission pressure setting value.

[0026] Optionally, the method further comprises:

[0027] Alarm is given when at least one of the following conditions occurs:

[0028] The servo fault of the high-pressure steam source switching valve;

[0029] The admission valve opening of the admission valve is greater than the second preset opening;

[0030] The actual admission pressure value of the small turbine is greater than the pressure preset threshold value;

[0031] At least one displacement sensor for measuring the admission valve opening of the high-pressure steam source switching valve in the high-pressure steam source switching valve fails;

[0032] The feedback deviation between at least two displacement sensors in the high-pressure steam source switching valve is greater than the preset feedback deviation value;

[0033] The deviation value between the actual admission pressure value of the small turbine and the corresponding admission pressure setting value is greater than the second deviation preset value.

[0034] Optionally, the method further comprises:

[0035] After opening the high-pressure steam source electric door, and before opening the high-pressure steam source switching valve, drain the water;

[0036] Determine whether the drain point pipe wall temperature exceeds the preset temperature value;

[0037] If it is determined that the drain point pipe wall temperature exceeds the preset temperature value, control the high-pressure steam source switching valve to open, and determine whether the admission temperature drop rate of the small turbine is greater than the first preset rate, if it is determined that the admission temperature drop rate is greater than the first preset rate, close the high-pressure steam source switching valve, and when the admission temperature drop rate of the small turbine is less than the second preset rate, control the high-pressure steam source switching valve to open;

[0038] If it is determined that the drain point pipe wall temperature does not exceed the preset temperature value, the high-pressure steam source switching valve remains closed.

[0039] The second aspect further provides a control device of a high-pressure steam source of a small steam turbine, the control device comprising:

[0040] A first acquisition module configured to acquire a first inlet steam pressure parameter when the high-pressure steam source of the small steam turbine only supplies five-stage extraction steam in real time;

[0041] A control module configured to determine whether a first inlet steam pressure corresponding to the first inlet steam pressure parameter is less than a preset pressure value;

[0042] The control module is further configured to control the high-pressure steam source switching valve to open if it is determined that the first inlet steam pressure is less than the preset pressure value.

[0043] A second acquisition module configured to acquire a second inlet steam pressure parameter corresponding to the mixed high-pressure steam source supplied to the small steam turbine via the inlet steam regulating valve, wherein the mixed high-pressure steam source comprises five-stage extraction steam and cold re-extraction steam via the high-pressure steam source switching valve.

[0044] The control module is further configured to control the flow of the mixed high-pressure steam source into the small steam turbine in real time to control the small steam turbine to operate in a stable state, wherein the stable state comprises that the second inlet steam pressure corresponding to the second inlet steam pressure parameter is within a pressure threshold range, and the rotating speed of the small steam turbine is within a preset rotating speed range, wherein the pressure threshold range is related to the inlet steam pressure set value.

[0045] According to a third aspect of the embodiments of the present disclosure, a terminal device is provided, comprising:

[0046] A processor;

[0047] A memory for storing processor-executable instructions;

[0048] The processor is configured to perform the steps of the control method of the high-pressure steam source of the small steam turbine provided by the first aspect of the present disclosure.

[0049] According to a fourth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, which stores computer program instructions, and the program instructions are executed by a processor to implement the steps of the control method of the high-pressure steam source of the small steam turbine provided by the first aspect of the present disclosure.

[0050] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0051] By the technical solution, the flow of the mixed high-pressure steam source entering the small steam turbine can be automatically regulated in real time, the small steam turbine admission pressure and rotating speed are maintained stable, that is, the whole process of the small steam turbine high-pressure steam source is automatically controlled. The high-pressure steam source switching valve is automatically controlled to ensure the admission parameters of the small steam turbine, and the problems of the small steam turbine output limited and the thermal power generating unit electric / thermal load limited caused by the small steam turbine steam source pressure reduced when the thermal power generating unit is in a low load operation condition or a high heating condition are solved, and the automation level and real-time regulation of the unit are improved.

[0052] Other features and advantages of the present disclosure will be described in detail in the following detailed description.

[0053] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0055] Figure 1 is a schematic diagram of a small steam turbine steam supply system according to an exemplary embodiment;

[0056] Figure 2 is a flow chart of a control method of a small steam turbine high-pressure steam source according to an exemplary embodiment;

[0057] Figure 3 is a schematic diagram of a sliding pressure control curve according to an exemplary embodiment;

[0058] Figure 4 is a schematic diagram of a control device of a small steam turbine high-pressure steam source according to an exemplary embodiment;

[0059] Figure 5 is a schematic diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0060] The detailed description of the present disclosure is described in detail below in combination with the drawings. It should be understood that the detailed description described herein is only used to illustrate and explain the present disclosure, and cannot limit the present disclosure.

[0061] The control method of the small steam turbine high-pressure steam source provided by the embodiments of the present disclosure is applied to the small steam turbine steam supply system, and the whole process of the small steam turbine high-pressure steam source is automatically controlled. Please refer to Figure 1 , Figure 1Fig. 1 is a schematic diagram of a small turbine steam supply system according to an exemplary embodiment.

[0062] The small turbine steam supply system comprises a steam extraction branch, an auxiliary steam branch, a cold re-supply steam branch, an inlet valve, a drain pneumatic door, a small turbine and a feed water pump. The steam extraction branch comprises a five-stage extraction electric valve for controlling five-stage extraction flow. The auxiliary steam branch comprises an auxiliary steam electric valve for controlling auxiliary steam flow. The cold re-supply steam branch comprises a high-pressure steam source switching valve for controlling cold re-extraction flow. The drain pneumatic door is arranged on the cold re-supply steam branch and a drain temperature detection point is arranged for detecting the drain point pipe wall temperature during the drain process. The three branches of the steam extraction branch, the auxiliary steam branch and the cold re-supply steam branch are arranged in parallel and are merged into the small turbine through the inlet valve.

[0063] In the embodiment of the present disclosure, two sets of high-pressure steam source switching valve feedback measurement devices are arranged in the cold re-supply steam branch. The reliability and accuracy of the high-pressure steam source switching valve can be improved by arranging the two sets of high-pressure steam source switching valve feedback measurement devices in a redundant configuration. The high-pressure steam source switching valve feedback measurement device can be a displacement sensor, such as a linear variable differential transformer (LVDT).

[0064] As a possible implementation, the rate of five-stage extraction into the small turbine is controlled by controlling the inlet valve opening degree of the five-stage extraction electric valve. The rate of auxiliary extraction into the small turbine is controlled by controlling the inlet valve opening degree of the auxiliary steam electric valve. The rate of cold re-extraction into the small turbine is controlled by controlling the inlet valve opening degree of the high-pressure steam source switching valve. The rate and amount of high-pressure steam source into the small turbine are controlled by controlling the inlet valve opening degree of the inlet valve. The amount of high-pressure steam source into the small turbine affects the rotational speed of the small turbine, and the small turbine drives the feed water pump. Therefore, the rotational speed of the small turbine also affects the rotational speed of the feed water pump, thereby affecting the output feed water flow.

[0065] Based on the above small turbine steam supply system, the present disclosure provides a control method for a small turbine high-pressure steam source. Please refer to Figure 2 , Figure 2 Fig. 2 is a flowchart of a control method for a small turbine high-pressure steam source according to an exemplary embodiment. As shown in Fig. 2, the control method for the small turbine high-pressure steam source can comprise the following steps. Figure 2

[0066] In step S101, a first inlet pressure parameter when the small turbine high-pressure steam source is only five-stage extraction is acquired in real time.

[0067] ​In the embodiments of the present disclosure, the method for obtaining the first pressure parameter can be to search for the inlet steam pressure measuring point information of the small steam turbine through a DCS system (Distributed Control System), to obtain the measuring point DCS code, and to obtain the first inlet steam parameter value of the small steam turbine in real time according to the measuring point code.

[0068] In step S102, it is determined whether the first inlet steam pressure corresponding to the first inlet steam pressure parameter is less than a preset pressure value.

[0069] In the embodiments of the present disclosure, the first inlet steam pressure curve of the small steam turbine in a preset time length is drawn according to the first inlet steam parameter value obtained in real time, and the change trend of the first inlet steam pressure of the small steam turbine with the load or the heat supply is obtained.

[0070] In step S103, if it is determined that the first inlet steam pressure is less than the preset pressure value, the high-pressure steam source switching valve is opened.

[0071] In the embodiments of the present disclosure, the first inlet steam pressure of the small steam turbine is monitored in real time through the first inlet steam pressure curve. When the first inlet steam pressure of the small steam turbine has a downward trend and starts to be lower than the preset pressure value due to the low load or high heat supply operating condition of the thermal power generator set, the high-pressure steam source switching valve is opened, so that the mixed high-pressure steam source formed by the cold re-extraction steam and the five-stage extraction steam enters the small steam turbine for rotation.

[0072] In step S104, a second inlet steam pressure parameter corresponding to the mixed high-pressure steam source delivered to the small steam turbine through the inlet steam regulating valve is obtained, wherein the mixed high-pressure steam source includes the five-stage extraction steam and the cold re-extraction steam through the high-pressure steam source switching valve.

[0073] As a possible implementation, the small steam turbine cannot meet the demand of the boiler feed water quantity even if the inlet steam regulating valve is fully opened due to the decrease of the inlet steam parameter, and the inlet steam parameter of the small steam turbine needs to be increased to solve the problem of insufficient output. The temperature difference between the auxiliary steam source and the five-stage extraction steam source exceeds 100℃, the matching is poor, and the auxiliary steam source cannot be used as the "pressure boosting" steam source. The temperature of the cold re-extraction steam is close to that of the five-stage extraction steam, and the pressure of the cold re-extraction steam is much greater than that of the five-stage extraction steam source, so the cold re-extraction steam is used to increase the inlet steam pressure of the small steam turbine.

[0074] The second inlet steam pressure parameter corresponding to the mixed high-pressure steam source delivered to the small steam turbine through the inlet steam regulating valve is obtained, so as to monitor the second inlet steam pressure of the small steam turbine in real time.

[0075] In step S105, the flow of the mixed high-pressure steam source into the small steam turbine is controlled in real time to control the small steam turbine in a stable operation state; wherein the stable operation state includes that the second inlet steam pressure corresponding to the second inlet steam pressure is within a pressure threshold range, and the rotating speed of the small steam turbine is within a preset rotating speed range, wherein the pressure threshold range is related to the inlet steam pressure set value.

[0076] Referring to Figure 3 , Figure 3 is a schematic diagram of a sliding pressure control curve according to an exemplary embodiment. In the embodiments of the present disclosure, the flow of the mixed high-pressure steam source into the small steam turbine is controlled in real time, which can include:

[0077] According to a predetermined sliding pressure control curve of the inlet steam pressure set value and the feedwater flow, the flow of the mixed high-pressure steam source into the small steam turbine is controlled, wherein the sliding pressure control curve is used to represent the corresponding relationship between the feedwater flow and the inlet steam pressure set value.

[0078] As a possible implementation, the sliding pressure control curve drawing method can include: under the condition of a given feedwater flow, changing the inlet steam pressure of the small steam turbine, taking the inlet steam pressure corresponding to the two conditions of high load (feedwater flow > 1500 t / h) and the throttle opening of the small steam turbine being 55% and low load (feedwater flow < 1000 t / h) and the throttle opening of the small steam turbine being 45%, respectively performing different feedwater flow tests, and finally determining the sliding pressure control curve by a piecewise linear function.

[0079] As a possible implementation, the control method of the high-pressure steam source of the small steam turbine can further include:

[0080] When the feedwater flow is within the preset feedwater flow reverse tracking interval of the sliding pressure control curve, it is determined whether the current actual inlet steam pressure value is less than the inlet steam pressure set value corresponding to the current actual inlet steam pressure value;

[0081] If it is determined that the current actual inlet steam pressure value is less than the inlet steam pressure set value corresponding to the current actual inlet steam pressure value, the inlet steam pressure value is controlled to increase until the current actual inlet steam pressure value reaches the inlet steam pressure set value corresponding to the current actual inlet steam pressure value.

[0082] In the embodiments of the present disclosure, the inlet steam pressure set value curve provided by the pump steam turbine manufacturer is drawn in the first inlet steam pressure curve, and the real-time first inlet steam pressure is compared with the corresponding inlet steam pressure set value to determine whether the difference between the current actual inlet steam pressure value of the small steam turbine and the corresponding inlet steam pressure set value exceeds the first deviation preset value.

[0083] Optionally, if it is determined that the current actual inlet steam pressure value is less than the inlet steam pressure set value corresponding to the current actual inlet steam pressure value, the inlet steam pressure value is controlled to increase, which includes:

[0084] determining whether the difference between the current actual admission pressure value of the small steam turbine and the corresponding admission pressure set value exceeds a first deviation preset value;

[0085] If it is determined that the difference between the current actual admission pressure value of the small steam turbine and the corresponding admission pressure set value exceeds the first deviation preset value, the opening degree rising rate of the high-pressure steam source switching valve is increased to increase the opening rate of the high-pressure steam source switching valve.

[0086] That is, according to the sliding pressure control curve, the high-pressure steam source switching valve can be controlled to supply high-pressure steam under low load or high heating conditions, thereby increasing the admission pressure value of the small steam turbine to achieve the effect of pressure boosting and speed rising.

[0087] In the embodiments of the present disclosure, the interval of 1000-1500 t / h of the feedwater flow is set as a reverse tracking interval, and in the reverse tracking interval, the admission pressure of the small steam turbine can meet the speed control requirement without intervention.

[0088] As a possible implementation, the control method of the high-pressure steam source of the small steam turbine can further include:

[0089] determining whether the opening degree of the admission valve exceeds a first preset opening degree;

[0090] If it is determined that the opening degree of the admission valve exceeds the first preset opening degree, the pressure set correction value of the admission valve is calculated according to a first expression, wherein the first expression is:

[0091] ΔP = 0 + (IVO-55%) * 0.015

[0092] In the formula, ΔP represents the pressure set correction value of the admission valve, and IVO represents the opening degree of the admission valve.

[0093] The admission pressure set value of the admission valve is adjusted according to the pressure set correction value, and the admission valve opening degree is corrected according to the adjusted admission pressure set value.

[0094] In the embodiments of the present disclosure, when the opening degree of the admission valve is below 55%, no pressure set value correction of the admission valve is performed; when the opening degree of the admission valve is above 55%, the pressure set value correction is performed to accelerate the opening of the admission valve and ensure that the opening degree does not exceed the limit, so that the output of the small steam turbine is not limited.

[0095] As a possible implementation, the control method of the high-pressure steam source of the small steam turbine can further include:

[0096] At least one of the following situations occurs to alarm:

[0097] Servo fault of the high-pressure steam source switching valve;

[0098] The opening degree of the inlet regulating valve of the inlet regulating valve is greater than the second preset opening degree;

[0099] The actual inlet pressure value of the small turbine is greater than the pressure preset threshold value;

[0100] At least one displacement sensor in the high-pressure steam source switching valve for measuring the opening degree of the inlet regulating valve of the high-pressure steam source switching valve fails;

[0101] The feedback deviation between at least two displacement sensors in the high-pressure steam source switching valve is greater than the preset feedback deviation value;

[0102] The deviation value between the actual inlet pressure value of the small turbine and the corresponding inlet pressure set value is greater than the second deviation preset value.

[0103] In the embodiments of the present disclosure, the servo fault of the high-pressure steam source switching valve is alarmed; the opening degree of the inlet regulating valve is greater than 70% and an alarm is given; the inlet pressure of the small turbine is greater than 1.2 MPa and an alarm is given; at least one displacement sensor in the high-pressure steam source switching valve for measuring the opening degree of the inlet regulating valve of the high-pressure steam source switching valve fails and an alarm is given; the feedback deviation between at least two displacement sensors in the high-pressure steam source switching valve is greater than the preset feedback deviation value and an alarm is given; the deviation value between the actual inlet pressure value of the small turbine and the corresponding inlet pressure set value is greater than the second deviation preset value and an alarm is given.

[0104] As a possible implementation, in the case that the small turbine has tripped or has been blocked, the high-pressure steam source switching valve is triggered to be forcibly closed.

[0105] As a possible implementation, the control method of the high-pressure steam source of the small turbine can further include:

[0106] After the high-pressure steam source electric door is opened, and before the high-pressure steam source switching valve is opened, the drain is performed;

[0107] It is determined whether the drain point pipe wall temperature exceeds the preset temperature value;

[0108] If it is determined that the drain point pipe wall temperature exceeds the preset temperature value, the high-pressure steam source switching valve is controlled to be opened, and it is determined whether the inlet temperature drop rate of the small turbine is greater than the first preset rate; if it is determined that the inlet temperature drop rate is greater than the first preset rate, the high-pressure steam source switching valve is closed, and when the inlet temperature drop rate of the small turbine is less than the second preset rate, the high-pressure steam source switching valve is controlled to be opened;

[0109] If it is determined that the drain point pipe wall temperature does not exceed the preset temperature value, the high-pressure steam source switching valve remains closed.

[0110] In the embodiments of the present disclosure, before the high-pressure steam source switching valve is ready to be put into use, a high-pressure steam source pipe warming program is started first. After the high-pressure steam source electric door is opened, and before the high-pressure steam source switching valve is opened, the steam is drained. The high-pressure steam source switching valve is started to be opened after the pipe wall temperature of the steam drain point exceeds the saturation temperature under the corresponding pressure by 30 DEG C, and the steam inlet temperature of the small steam turbine is tracked. If the steam inlet temperature of the small steam turbine decreases at a rate of > 5 DEG C / min after the high-pressure steam source switching valve is opened, the high-pressure steam source switching valve is immediately closed; when the steam inlet temperature of the small steam turbine decreases at a rate of < 1 DEG C / min, the high-pressure steam source switching valve is opened again. When the opening degree of the high-pressure steam source switching valve is ≥ 5% and the steam inlet temperature of the small steam turbine decreases at a rate of < 1 DEG C / min, the steam drain pneumatic door is closed, and the high-pressure steam source switching valve is kept at a small flow rate of 5% opening degree.

[0111] In the above technical solution, the flow rate of the mixed high-pressure steam source entering the small steam turbine can be automatically regulated in real time, the steam inlet pressure and the rotating speed of the small steam turbine are maintained stable, that is, the whole process of using the high-pressure steam source of the small steam turbine is automatically controlled. By automatically controlling the high-pressure steam source switching valve, the steam inlet parameters of the small steam turbine are ensured, and the problems that the power generation unit is in a low load operation condition or a high heat supply condition, the steam source pressure of the small steam turbine is reduced, the output of the small steam turbine is limited, and the electric / heat load of the power generation unit is limited are solved, and the automation level and the real-time regulation of the unit are improved.

[0112] Figure 4 A control device 20 of a small steam turbine high-pressure steam source is shown according to an exemplary embodiment, and the control device 20 comprises:

[0113] A first acquisition module 210 is configured to acquire a first steam inlet pressure parameter when the high-pressure steam source of the small steam turbine is only five-stage extraction steam in real time;

[0114] A control module 220 is configured to determine whether the first steam inlet pressure corresponding to the first steam inlet pressure parameter is less than a preset pressure value;

[0115] The control module 220 is further configured to control the high-pressure steam source switching valve to be opened if it is determined that the first steam inlet pressure is less than the preset pressure value;

[0116] A second acquisition module 230 is configured to acquire a second steam inlet pressure parameter corresponding to when the mixed high-pressure steam source is delivered to the small steam turbine via the steam inlet valve, wherein the mixed high-pressure steam source comprises five-stage extraction steam and cold re-extraction steam via the high-pressure steam source switching valve;

[0117] The control module 220 is further configured to regulate the flow of the mixed high-pressure steam source entering the small steam turbine in real time to control the small steam turbine to a steady operation state; wherein the steady operation state includes that the second inlet steam pressure corresponding to the second inlet steam pressure parameter is within a pressure threshold range, and the rotating speed of the small steam turbine is within a preset rotating speed range, wherein the pressure threshold range is related to the inlet steam pressure set value.

[0118] As to the apparatus in the above-mentioned embodiments, the specific manners in which various modules perform operations have been described in detail in the embodiments of the method, and thus will not be described in detail here.

[0119] Figure 5 is a block diagram of an electronic device 700 according to an exemplary embodiment. As shown in Figure 5 The electronic device 700 can include a processor 701, a memory 702. The electronic device 700 can further include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0120] The processor 701 is configured to control overall operations of the electronic device 700 to complete all or part of the steps in the control method of the small steam turbine high-pressure steam source described above.

[0121] The memory 702 is configured to store various types of data to support operations of the electronic device 700, which can include, for example, instructions for operating any application or method on the electronic device 700, and application-related data such as contact data, transmitted and received messages, pictures, audio, video, and the like. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic storage, a flash memory, a magnetic disk, or an optical disk.

[0122] The multimedia component 703 can include a screen and audio components. The screen, for example, can be a touch screen, and the audio components can be for outputting and / or inputting audio signals. For example, the audio components can include a microphone for receiving external audio signals. The received audio signals can be further stored in the memory 702 or transmitted through the communication component 705. The audio components also include at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, which can be a keyboard, a mouse, a button, and the like. The buttons can be virtual buttons or physical buttons. The communication component 705 is configured to perform wired or wireless communication between the electronic device 700 and other devices. The wireless communication, for example, can be Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, and the like, or a combination of one or more of them, without limitation. Accordingly, the communication component 705 can include a Wi-Fi module, a Bluetooth module, an NFC module, and the like.

[0123] In an example embodiment, the electronic device 700 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the control method of the high-pressure steam source of the small steam turbine.

[0124] In another example embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the control method of the high-pressure steam source of the small steam turbine. For example, the computer-readable storage medium can be the memory 702 including program instructions described above, which can be executed by the processor 701 of the electronic device 700 to complete the control method of the high-pressure steam source of the small steam turbine.

[0125] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0126] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction.

[0127] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as disclosed by the present disclosure.

Claims

1. A control method of a high-pressure steam source of a small steam turbine, characterized by, The method comprises: acquiring a first inlet steam pressure parameter when the high-pressure steam source of the small steam turbine is only five-stage extraction steam in real time; determining whether the first inlet steam pressure parameter corresponds to a first inlet steam pressure less than a preset pressure value; if it is determined that the first inlet steam pressure is less than the preset pressure value, controlling a high-pressure steam source switching valve to open; acquiring a second inlet steam pressure parameter corresponding to a mixed high-pressure steam source being delivered to the small steam turbine through an inlet steam regulating valve, wherein the mixed high-pressure steam source comprises the five-stage extraction steam and cold re-extraction steam through the high-pressure steam source switching valve; controlling the flow of the mixed high-pressure steam source into the small steam turbine according to a predetermined sliding pressure control curve of the inlet steam pressure set value and the feed water flow, so as to control the small steam turbine in a stable operation state; wherein the sliding pressure control curve is used to represent the corresponding relationship between the feed water flow and the inlet steam pressure set value, and the stable operation state comprises that the second inlet steam pressure parameter corresponds to a second inlet steam pressure within a pressure threshold range, and the rotating speed of the small steam turbine is within a preset rotating speed range, wherein the pressure threshold range is related to the inlet steam pressure set value; when the feed water flow is within a preset feed water flow reverse tracking interval of the sliding pressure control curve, determining whether a current actual inlet steam pressure value is less than an inlet steam pressure set value corresponding to the current actual inlet steam pressure value; if it is determined that the current actual inlet steam pressure value is less than the inlet steam pressure set value corresponding to the current actual inlet steam pressure value, controlling the inlet steam pressure value to increase until the current actual inlet steam pressure value reaches the inlet steam pressure set value corresponding to the current actual inlet steam pressure value; wherein, if it is determined that the current actual inlet steam pressure value is less than the inlet steam pressure set value corresponding to the current actual inlet steam pressure value, the inlet steam pressure value is controlled to increase, comprising: determining whether a difference between the current actual inlet steam pressure value of the small steam turbine and the corresponding inlet steam pressure set value exceeds a first deviation preset value; if it is determined that the difference between the current actual inlet steam pressure value of the small steam turbine and the corresponding inlet steam pressure set value exceeds the first deviation preset value, controlling the opening degree rising rate of the high-pressure steam source switching valve to increase, so as to increase the opening rate of the high-pressure steam source switching valve.

2. The control method of the high-pressure steam source of the small steam turbine according to claim 1, characterized by, The method further comprises: determining whether the opening degree of the inlet steam regulating valve exceeds a first preset opening degree; if it is determined that the opening degree of the inlet steam regulating valve exceeds the first preset opening degree, calculating a pressure set correction value of the inlet steam regulating valve according to a first expression, wherein the first expression is: ΔP = 0 + (IVO-55%) * 0.015 wherein, ΔP is used to represent the pressure set correction value of the inlet steam regulating valve, and IVO is used to represent the opening degree of the inlet steam regulating valve; adjusting the inlet steam pressure set value of the inlet steam regulating valve according to the pressure set correction value, and correcting the inlet regulating valve opening degree of the inlet steam regulating valve according to the adjusted inlet steam pressure set value.

3. The control method of the small turbine high-pressure steam source according to claim 1, characterized by, The method further comprises: when at least one of the following conditions occurs, an alarm is given: the high-pressure steam source switching valve servo fails; the inlet regulating valve opening degree of the inlet steam regulating valve is greater than a second preset opening degree; the actual inlet steam pressure value of the small steam turbine is greater than a pressure preset threshold value; The displacement sensor for measuring the opening degree of the inlet valve of the high-pressure steam source switching valve fails; The feedback deviation between at least two displacement sensors in the high-pressure steam source switching valve is greater than a preset feedback deviation value; The deviation between the actual inlet pressure value of the small turbine and the corresponding inlet pressure set value is greater than a second preset deviation value.

4. The control method of the small turbine high-pressure steam source according to claim 1, characterized by, The method further comprises: After opening the high-pressure steam source electric door, and before opening the high-pressure steam source switching valve, draining water; Determining whether the temperature of the drain point pipe wall exceeds a preset temperature value; If it is determined that the temperature of the drain point pipe wall exceeds the preset temperature value, controlling the high-pressure steam source switching valve to open, and determining whether the inlet temperature drop rate of the small turbine is greater than a first preset rate. If it is determined that the inlet temperature drop rate is greater than the first preset rate, closing the high-pressure steam source switching valve, and when the inlet temperature drop rate of the small turbine is less than a second preset rate, controlling the high-pressure steam source switching valve to open; If it is determined that the temperature of the drain point pipe wall does not exceed the preset temperature value, the high-pressure steam source switching valve remains closed.

5. A control device for a high-pressure steam source of a small steam turbine, characterized by The control device comprises: A first acquisition module configured to acquire a first inlet pressure parameter in real time when the high-pressure steam source of the small turbine is only five-stage extraction steam; A control module configured to determine whether the first inlet pressure corresponding to the first inlet pressure parameter is less than a preset pressure value; The control module is further configured to control the high-pressure steam source switching valve to open if it is determined that the first inlet pressure is less than the preset pressure value; A second acquisition module configured to acquire a second inlet pressure parameter corresponding to when mixed high-pressure steam is delivered to the small turbine via an inlet valve, wherein the mixed high-pressure steam includes the five-stage extraction steam and cold re-extraction steam via the high-pressure steam source switching valve; The control module is further configured to regulate the flow of the mixed high-pressure steam into the small turbine according to a predetermined sliding pressure control curve of the feedwater flow and the inlet pressure set value, so as to control the small turbine in a stable operating state. The sliding pressure control curve is used to represent the corresponding relationship between the feedwater flow and the inlet pressure set value, and the stable operating state includes that the second inlet pressure corresponding to the second inlet pressure parameter is within a pressure threshold range, and the rotating speed of the small turbine is within a preset rotating speed range, wherein the pressure threshold range is related to the inlet pressure set value; When the feedwater flow is within a preset feedwater flow anti-tracking interval of the sliding pressure control curve, it is determined whether the current actual inlet pressure value is less than the inlet pressure set value corresponding to the current actual inlet pressure value; If it is determined that the current actual inlet pressure value is less than the inlet pressure set value corresponding to the current actual inlet pressure value, the inlet pressure value is controlled to increase until the current actual inlet pressure value reaches the inlet pressure set value corresponding to the current actual inlet pressure value; If it is determined that the current actual inlet pressure value is less than the inlet pressure set value corresponding to the current actual inlet pressure value, the inlet pressure value is controlled to increase until the current actual inlet pressure value reaches the inlet pressure set value corresponding to the current actual inlet pressure value; determining whether a difference between the current actual admission pressure value of the small steam turbine and the corresponding admission pressure set value exceeds a first deviation preset value; if it is determined that the difference between the current actual admission pressure value of the small steam turbine and the corresponding admission pressure set value exceeds the first deviation preset value, increasing an opening degree rising rate of the high-pressure steam source switching valve to increase an opening rate of the high-pressure steam source switching valve.

6. An electronic device, comprising: comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the steps of the method of any one of claims 1-4.

7. A computer-readable storage medium having stored thereon computer program instructions, wherein, the program instructions, when executed by the processor, implement the steps of the method of any one of claims 1-4.

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