CN116085071A - Control method and device for high-pressure steam source of small steam turbine and electronic equipment - Google Patents
Control method and device for high-pressure steam source of small steam turbine and electronic equipment Download PDFInfo
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- CN116085071A CN116085071A CN202310004683.7A CN202310004683A CN116085071A CN 116085071 A CN116085071 A CN 116085071A CN 202310004683 A CN202310004683 A CN 202310004683A CN 116085071 A CN116085071 A CN 116085071A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/301—Pressure
- F05D2270/3011—Inlet pressure
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Abstract
The disclosure relates to a control method and device for a high-pressure steam source of a small steam turbine and electronic equipment, wherein the method comprises the following steps: acquiring a first steam inlet pressure parameter of a small turbine when a high-pressure steam source is only five sections of steam extraction in real time; determining whether the first steam inlet pressure corresponding to the first steam inlet pressure parameter is smaller than a preset pressure value; if the first steam inlet pressure is determined to be smaller than the preset pressure value, the high-pressure steam source switching valve is controlled to be opened; obtaining a second inlet pressure parameter corresponding to the process of conveying the mixed high-pressure steam source to the small turbine through the inlet regulating valve, wherein the mixed high-pressure steam source comprises: five sections of steam extraction and cold re-extraction through a high-pressure steam source switching valve; and regulating and controlling the flow of the mixed high-pressure steam source entering the small steam turbine in real time so as to control the small steam turbine in a stable running state, wherein the stable running state comprises the following steps: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range.
Description
Technical Field
The disclosure relates to the technical field of supercritical unit debugging, in particular to a control method and device for a high-pressure steam source of a small steam turbine and electronic equipment.
Background
Along with development of deep peak regulation work of the thermal generator set, the load of the set is changed into a normal state frequently, and particularly when the thermal generator set is in a low-load operation working condition or a high-heat supply working condition, the switching and adjustment of a high-pressure steam source of a small steam turbine are required to meet the requirements of the thermal generator set in order to ensure safe and stable operation of the thermal generator set.
Currently, the high pressure steam sources of small turbines include: five sections of extraction steam, auxiliary steam starting steam sources and cold re-supply steam pipeline high-pressure steam sources are led out after the 8 th stage of the medium-pressure cylinder of the main steam turbine. The main steam source of the small steam turbine is five sections of extraction steam, and the pressure of the five sections of extraction steam changes along with the load change of the thermal generator set. MEH (Micro Electro-Hydraulic Control System, small turbine electrohydraulic control system) control logic provided for pump turbine manufacturers controls the rotating speed of the small turbine through the opening of the steam inlet regulating valve, and meets the requirement of the water supply flow of the furnace, namely, the five-extraction steam source and the high-pressure steam source switching valve are controlled in a constant pressure mode. When the thermal generator set is in a low-load operation working condition or a high-heat supply working condition, the five-section steam extraction pressure is reduced, and when the full opening of the steam inlet valve still cannot meet the rotating speed requirement of the small steam turbine, the high-pressure steam source switching valve is required to be opened, and the pressure after the high-pressure steam source switching valve is opened is controlled according to the preset steam inlet pressure set value of a manufacturer. However, once the load of the thermal generator set changes, the inlet pressure set point needs to be set again manually, so that the regulation has hysteresis.
Disclosure of Invention
The invention aims to provide a control method and device for a high-pressure steam source of a small steam turbine and electronic equipment, so as to solve the problems in the related art.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect, a method for controlling a high-pressure steam source of a small turbine is provided, the method comprising:
acquiring a first steam inlet pressure parameter of a small turbine when a high-pressure steam source is only five sections of steam extraction in real time;
determining whether the first steam inlet pressure corresponding to the first steam inlet pressure parameter is smaller than a preset pressure value;
if the first steam inlet pressure is determined to be smaller than the preset pressure value, the high-pressure steam source switching valve is controlled to be opened;
obtaining a second inlet pressure parameter corresponding to the process of conveying the mixed high-pressure steam source to the small turbine through the inlet regulating valve, wherein the mixed high-pressure steam source comprises: five sections of steam extraction and cold re-extraction through a high-pressure steam source switching valve;
the flow of the mixed high-pressure steam source entering the small turbine is regulated and controlled in real time, so that the small turbine is controlled in a stable running state; wherein the steady operation state comprises: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range, wherein the pressure threshold range is related to a steam inlet pressure set value.
Optionally, the flow of the mixed high-pressure steam source entering the small steam turbine is regulated in real time, including:
regulating and controlling the flow of the mixed high-pressure steam source entering the small steam turbine according to a predetermined slip pressure control curve of the steam inlet pressure set value and the water supply flow, wherein the slip pressure control curve is used for representing the corresponding relation between the water supply flow and the steam inlet pressure set value.
Optionally, the method further comprises:
when the water supply flow is in a water supply flow anti-tracking interval preset by the sliding pressure control curve, determining whether the current actual steam inlet pressure value is smaller than a steam inlet pressure set value corresponding to the current actual steam inlet pressure value;
and if the current actual steam inlet pressure value is determined to be smaller than the steam inlet pressure set value corresponding to the current actual steam inlet pressure value, controlling the steam inlet pressure value to increase until the current actual steam inlet pressure value reaches the steam inlet pressure set value corresponding to the current actual steam inlet pressure value.
Optionally, if it is determined that the current actual intake pressure value is smaller than the intake pressure set value corresponding to the current actual intake pressure value, controlling the increase of the intake pressure value includes:
determining whether the difference value between the current actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value exceeds a first deviation preset value;
if the difference value between the current actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value exceeds the first deviation preset value, controlling the opening 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.
Optionally, the method further comprises:
determining whether the opening of the steam inlet regulating valve exceeds a first preset opening;
if the opening degree of the air inlet regulating valve is determined to exceed the first preset opening degree, calculating a pressure setting correction value of the air inlet regulating valve according to a first expression, wherein the first expression is as follows:
ΔP＝0+(IVO-55％)*0.015
wherein DeltaP is used for representing a pressure setting correction value of the inlet air regulating valve, and IVO is used for representing the opening degree of the inlet air regulating valve;
and adjusting the inlet pressure set value of the inlet regulating valve according to the pressure set correction value, and correcting the opening of the inlet regulating valve according to the adjusted inlet pressure set value.
Optionally, the method further comprises:
alerting upon at least one of:
servo failure of the high-pressure steam source switching valve;
the opening of the steam inlet regulating valve is larger than a second preset opening;
the actual inlet pressure value of the small turbine is larger than a pressure preset threshold value;
at least one displacement sensor for measuring the opening of an inlet valve of the high-pressure steam source switching valve in 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 larger than a preset feedback deviation value;
the deviation value between the actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value is larger than the second deviation preset value.
Optionally, the method further comprises:
draining water after the high-pressure steam source electric door is opened and before the high-pressure steam source switching valve is opened;
determining whether the wall temperature of the hydrophobic point exceeds a preset temperature value;
if the pipe wall temperature of the drain point exceeds the preset temperature value, controlling a high-pressure steam source switching valve to be opened, determining whether the steam inlet temperature descending rate of the small steam turbine is larger than a first preset rate, if so, closing the high-pressure steam source switching valve, and when the steam inlet temperature descending rate of the small steam turbine is smaller than a second preset rate, controlling the high-pressure steam source switching valve to be opened;
if the pipe wall temperature of the drain point is not higher than the preset temperature value, the high-pressure steam source switching valve is kept closed.
In a second aspect, there is also provided a control device for a high pressure steam source of a small turbine, the control device comprising:
the first acquisition module is configured to acquire first steam inlet pressure parameters of the small turbine when the high-pressure steam source is only five sections of steam extraction in real time;
the control module is configured to determine whether the first steam inlet pressure corresponding to the first steam inlet pressure parameter is smaller than a preset pressure value;
the control module is further configured to control the high-pressure steam source switching valve to be opened if the first steam inlet pressure is determined to be smaller than a preset pressure value;
a second acquisition module configured to acquire a second inlet pressure parameter corresponding to when the mixed high-pressure steam source is delivered to the small turbine via the inlet modulation valve, wherein the mixed high-pressure steam source comprises: five sections of steam extraction and cold re-extraction through a high-pressure steam source switching valve;
the control module is also configured to regulate and control the flow of the mixed high-pressure steam source entering the small steam turbine in real time so as to control the small steam turbine to be in a stable running state; wherein the steady operation state comprises: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range, wherein the pressure threshold range is related to a steam inlet pressure set value.
According to a third aspect of embodiments of the present disclosure, there is provided a power-on electronic device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to perform the steps of the method for controlling the high pressure steam source of the small turbine provided in the first aspect of the present disclosure.
According to a fourth aspect of embodiments of the present disclosure, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method for controlling a high pressure steam source of a small turbine provided in the first aspect of the present disclosure.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
through the technical scheme, the flow of the mixed high-pressure steam source entering the small turbine can be automatically regulated and controlled in real time, and the stability of the steam inlet pressure and the rotating speed of the small turbine is maintained, namely, the whole-process automatic control of the high-pressure steam source of the small turbine is realized when the high-pressure steam source of the small turbine is put into use. The steam inlet parameters of the small steam turbine are ensured by automatically controlling the high-pressure steam source switching valve, so that the problems of limited output of the small steam turbine, limited electric/thermal load of the thermal generator set and the like caused by the reduction of the steam source pressure of the small steam turbine when the thermal generator set is in a low-load operation working condition or a high-heat supply working condition are solved, and the automation level and the regulation and control instantaneity of the thermal generator set are improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a small turbine steam supply system, according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of controlling a high pressure steam source of a small turbine according to an exemplary embodiment;
FIG. 3 is a schematic diagram of a slip pressure control curve, according to an example embodiment;
FIG. 4 is a schematic diagram illustrating a control apparatus for a high pressure steam source of a small turbine according to an exemplary embodiment;
fig. 5 is a schematic diagram of an electronic device, according to an example embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
The control method of the small turbine high-pressure steam source provided by the embodiment of the disclosure is applied to a small turbine steam supply system, and the whole-course automatic control of the small turbine high-pressure steam source in use is realized. Referring to FIG. 1, FIG. 1 is a schematic diagram of a steam supply system for a small turbine, according to an exemplary embodiment.
The steam supply system of the small steam turbine comprises: the system comprises a steam extraction branch, an auxiliary steam branch, a cold re-supply branch, a steam inlet regulating valve, a drainage pneumatic door, a small steam turbine and a water supply pump, wherein the steam extraction branch comprises five sections of steam extraction electric valves for controlling five sections of steam extraction circulation, the auxiliary steam branch comprises an auxiliary steam electric valve for controlling auxiliary steam circulation, and the cold re-supply branch comprises a high-pressure steam source switching valve for controlling refrigeration re-extraction circulation. The hydrophobic pneumatic door is arranged on the cold re-steam supply branch and is provided with a hydrophobic temperature detection point for detecting the wall temperature of the hydrophobic point in the hydrophobic process. The three branches of the steam extraction branch, the auxiliary steam branch and the cold re-steam supply branch are arranged in parallel and are converged into the small steam turbine through the steam inlet regulating valve.
In the embodiment of the disclosure, the cold re-steam supply branch is provided with two sets of high-pressure steam source switching valve feedback measuring devices. By arranging the redundancy configuration method of the feedback measurement device of the two sets of high-pressure steam source switching valves, the reliability and the accuracy of the high-pressure steam source switching valves can be improved; the high-pressure steam source switching valve feedback measuring device can be a displacement sensor, such as a linear variable differential transformer (Linear Variable Displacement Transducer, abbreviated as LVDT).
As a possible implementation mode, the speed of five-section extraction in the small steam turbine is controlled by controlling the opening of an inlet valve of the five-section extraction electric valve; controlling the speed of auxiliary steam extraction in the small steam turbine by controlling the opening of a steam inlet valve of an auxiliary steam electric valve; controlling the opening of a steam inlet regulating valve of a high-pressure steam source switching valve to control the speed of cold re-extraction in the small steam turbine; the speed and the quantity of the high-pressure steam source input into the small steam turbine are controlled by controlling the opening of the steam inlet regulating valve. The number of high-pressure steam sources in the small steam turbine influences the rotating speed of the small steam turbine, and the small steam turbine drives the water feeding pump, so that the rotating speed of the small steam turbine influences the rotating speed of the water feeding pump, and the output water feeding flow is influenced.
Based on the small turbine steam supply system, the embodiment of the disclosure provides a control method of a high-pressure steam source of a small turbine. Referring to fig. 2, fig. 2 is a flowchart illustrating a method for controlling a high pressure steam source of a small turbine according to an exemplary embodiment, and as shown in fig. 2, the method for controlling a high pressure steam source of a small turbine may include:
in step S101, a first steam inlet pressure parameter of the small turbine when the high-pressure steam source is only five-stage steam extraction is obtained in real time.
In the embodiment of the disclosure, the method for acquiring the first pressure parameter may be searching for the steam inlet pressure measuring point information of the small turbine through a DCS system (Distributed Control System ), acquiring a measuring point DCS code, and acquiring the first steam inlet parameter value of the small turbine in real time according to the measuring point code.
In step S102, it is determined whether the first intake pressure corresponding to the first intake pressure parameter is less than a preset pressure value.
In the embodiment of the disclosure, a first steam inlet pressure curve of a small steam turbine within a preset duration is drawn according to a first steam inlet parameter value obtained in real time, and a trend of variation of the first steam inlet pressure of the small steam turbine along with load or heating capacity is obtained.
In step S103, if it is determined that the first intake pressure is less than the preset pressure value, the high-pressure steam source switching valve is controlled to open.
In the embodiment of the disclosure, the first steam inlet pressure of the small steam turbine is monitored in real time through the first steam inlet pressure curve. When the first steam inlet pressure of the small steam turbine has a descending trend and starts to be lower than a preset pressure value due to low load or high heat supply working condition operation of the thermal generator set, the high-pressure steam source switching valve is controlled to be opened, so that a mixed high-pressure steam source formed by mixing cold re-extraction steam and five sections of extraction steam enters the small steam turbine to perform flushing rotation.
In step S104, a second inlet pressure parameter corresponding to the case of delivering the mixed high-pressure steam source to the small turbine via the inlet regulating valve is obtained, where the mixed high-pressure steam source includes: five sections of extraction and cold re-extraction through a high-pressure steam source switching valve.
As a possible implementation mode, the steam inlet parameters of the small steam turbine are reduced, so that the water supply requirement of the boiler cannot be met even if the steam inlet regulating valve is fully opened, and the steam inlet parameters of the small steam turbine are required to be improved to solve the problem of insufficient output. The temperature difference between the auxiliary steam source and the five-stage steam extraction steam source exceeds 100 ℃, the matching is poor, and the auxiliary steam source and the five-stage steam extraction steam source cannot be used as a 'boosting' steam source. The temperature of the cold re-extraction steam is similar to that of the five-section extraction steam, and the pressure of the cold re-extraction steam is far greater than that of the five-section extraction steam source, so that the steam inlet pressure of the small steam turbine is improved by adding the cold re-extraction steam.
And acquiring a second steam inlet pressure parameter corresponding to the process of conveying the mixed high-pressure steam source to the small steam turbine through the steam inlet regulating valve so as to monitor the second steam inlet pressure of the small steam turbine in real time.
In step S105, the flow of the mixed high-pressure steam source entering the small turbine is regulated in real time, so as to control the small turbine in a stable running state; wherein the steady operation state comprises: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range, wherein the pressure threshold range is related to a steam inlet pressure set value.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a sliding pressure control curve according to an exemplary embodiment. In the embodiment of the disclosure, the real-time regulation of the flow rate of the mixed high-pressure steam source entering the small turbine may include:
regulating and controlling the flow of the mixed high-pressure steam source entering the small steam turbine according to a predetermined slip pressure control curve of the steam inlet pressure set value and the water supply flow, wherein the slip pressure control curve is used for representing the corresponding relation between the water supply flow and the steam inlet pressure set value.
As one possible implementation manner, the sliding pressure control curve drawing method may include: under the condition of given water supply flow, the steam inlet pressure of the small turbine is changed, the steam inlet pressure corresponding to the conditions of high load (water supply flow >1500 t/h), 55% of the opening degree of the small turbine and low load (water supply flow <1000 t/h) and 45% of the opening degree of the small turbine is taken, different water supply flow tests are respectively carried out, and finally, a sliding pressure control curve is determined through a piecewise linear function.
As one possible implementation manner, the control method of the high-pressure steam source of the small turbine may further include:
when the water supply flow is in a water supply flow anti-tracking interval preset by the sliding pressure control curve, determining whether the current actual steam inlet pressure value is smaller than a steam inlet pressure set value corresponding to the current actual steam inlet pressure value;
and if the current actual steam inlet pressure value is determined to be smaller than the steam inlet pressure set value corresponding to the current actual steam inlet pressure value, controlling the steam inlet pressure value to increase until the current actual steam inlet pressure value reaches the steam inlet pressure set value corresponding to the current actual steam inlet pressure value.
In the embodiment of the disclosure, a steam inlet pressure set value curve provided for a pump turbine manufacturer is drawn in the first steam inlet pressure curve, and the real-time first steam inlet pressure is compared with a corresponding steam inlet pressure set value to determine whether the difference value between the current actual steam inlet pressure value of the small turbine and the corresponding steam inlet pressure set value exceeds a first deviation preset value.
Optionally, if it is determined that the current actual intake pressure value is smaller than the intake pressure set value corresponding to the current actual intake pressure value, controlling the increase of the intake pressure value includes:
determining whether the difference value between the current actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value exceeds a first deviation preset value;
if the difference value between the current actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value exceeds the first deviation preset value, controlling the opening 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.
That is, according to the sliding pressure control curve, the high-pressure steam source switching valve can be controlled to supply steam from the high-pressure steam source under the working condition of low load or high heat supply, so that the steam inlet pressure value of the small steam turbine is improved to achieve the effect of boosting and accelerating.
In the embodiment of the disclosure, a section with the water supply flow rate of 1000-1500t/h is set as a back tracking section, and in the back tracking section, the inlet pressure of the small turbine can meet the rotating speed control requirement without intervention.
As one possible implementation manner, the control method of the high-pressure steam source of the small turbine may further include:
determining whether the opening of the steam inlet regulating valve exceeds a first preset opening;
if the opening degree of the air inlet regulating valve is determined to exceed the first preset opening degree, calculating a pressure setting correction value of the air inlet regulating valve according to a first expression, wherein the first expression is as follows:
ΔP＝0+(IVO-55％)*0.015
wherein DeltaP is used for representing a pressure setting correction value of the inlet air regulating valve, and IVO is used for representing the opening degree of the inlet air regulating valve;
and adjusting the inlet pressure set value of the inlet regulating valve according to the pressure set correction value, and correcting the opening of the inlet regulating valve according to the adjusted inlet pressure set value.
In the embodiment of the disclosure, when the opening of the inlet air regulating valve is below 55%, the pressure set value of the inlet air regulating valve is not corrected; when the opening of the inlet steam regulating valve is more than 55%, the pressure set value is corrected, so that the opening of the inlet steam regulating valve is quickened, the opening is ensured not to exceed the limit, and the output of the small steam turbine is not limited.
As one possible implementation manner, the control method of the high-pressure steam source of the small turbine may further include:
alerting upon at least one of:
servo failure of the high-pressure steam source switching valve;
the opening of the steam inlet regulating valve is larger than a second preset opening;
the actual inlet pressure value of the small turbine is larger than a pressure preset threshold value;
at least one displacement sensor for measuring the opening of an inlet valve of the high-pressure steam source switching valve in 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 larger than a preset feedback deviation value;
the deviation value between the actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value is larger than the second deviation preset value.
In the embodiment of the disclosure, the servo fault of the high-pressure steam source switching valve is alarmed; the opening degree of the steam inlet regulating valve is more than 70 percent, and the alarm is given; alarming when the inlet pressure of the small turbine is more than 1.2 MPa; at least one displacement sensor fault alarm for measuring the opening of an inlet valve of the high-pressure steam source switching valve in the high-pressure steam source switching valve; the feedback deviation between at least two displacement sensors in the high-pressure steam source switching valve is larger than a preset feedback deviation value to alarm; and alarming when the deviation value between the actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value is larger than a second deviation preset value.
As a possible embodiment, the forced closing of the high-pressure steam source switching valve is triggered in the event of a small steam turbine having tripped or been interrupted.
As one possible implementation manner, the control method of the high-pressure steam source of the small turbine may further include:
draining water after the high-pressure steam source electric door is opened and before the high-pressure steam source switching valve is opened;
determining whether the wall temperature of the hydrophobic point exceeds a preset temperature value;
if the pipe wall temperature of the drain point exceeds the preset temperature value, controlling a high-pressure steam source switching valve to be opened, determining whether the steam inlet temperature descending rate of the small steam turbine is larger than a first preset rate, if so, closing the high-pressure steam source switching valve, and when the steam inlet temperature descending rate of the small steam turbine is smaller than a second preset rate, controlling the high-pressure steam source switching valve to be opened;
if the pipe wall temperature of the drain point is not higher than the preset temperature value, the high-pressure steam source switching valve is kept closed.
In the embodiment of the disclosure, the high-pressure steam source heating pipe procedure is started before the high-pressure steam source switching valve is ready to be put into operation, and the high-pressure steam source heating pipe procedure is drained after the high-pressure steam source electric door is opened and before the high-pressure steam source switching valve is opened. Starting to open the high-pressure steam source switching valve after the pipe wall temperature from the drain point to the drain point exceeds the saturation temperature by 30 ℃ under the corresponding pressure, and tracking the steam inlet temperature of the small steam turbine. If the steam inlet temperature drop rate of the small steam turbine is more than 5 ℃/min after the high-pressure steam source switching valve is opened, immediately closing the high-pressure steam source switching valve; and after the steam inlet temperature of the small steam turbine is reduced to a speed of less than 1 ℃/min, opening a high-pressure steam source switching valve. When the opening of the high-pressure steam source switching valve is more than or equal to 5 percent and the rate of decline of the steam inlet temperature of the small steam turbine is less than 1 ℃/min, the hydrophobic pneumatic door is closed, and the high-pressure steam source switching valve is kept to circulate in a trace amount with the opening of 5 percent.
In the technical scheme, the flow of the mixed high-pressure steam source entering the small turbine can be automatically regulated and controlled in real time, and the stability of the steam inlet pressure and the rotating speed of the small turbine is maintained, namely, the whole-process automatic control of the high-pressure steam source of the small turbine is realized when the small turbine is put into use. The steam inlet parameters of the small steam turbine are ensured by automatically controlling the high-pressure steam source switching valve, so that the problems of limited output of the small steam turbine, limited electric/thermal load of the thermal generator set and the like caused by the reduction of the steam source pressure of the small steam turbine when the thermal generator set is in a low-load operation working condition or a high-heat supply working condition are solved, and the automation level and the regulation and control instantaneity of the thermal generator set are improved.
Fig. 4 shows a control device 20 for a high-pressure steam source of a small turbine according to an exemplary embodiment, where the control device 20 includes:
a first obtaining module 210 configured to obtain, in real time, a first inlet pressure parameter when the high-pressure steam source of the small turbine is only five sections of extraction steam;
the control module 220 is configured to determine whether the first intake pressure corresponding to the first intake pressure parameter is less than a preset pressure value;
the control module 220 is further configured to control the high-pressure steam source switching valve to be opened if the first steam inlet pressure is determined to be smaller than the preset pressure value;
a second obtaining module 230 configured to obtain a second intake pressure parameter corresponding to when the mixed high-pressure steam source is delivered to the small turbine via the intake regulating valve, wherein the mixed high-pressure steam source comprises: five sections of steam extraction and cold re-extraction through a high-pressure steam source switching valve;
the control module 220 is further configured to regulate and control the flow of the mixed high-pressure steam source entering the small turbine in real time so as to control the small turbine to be in a stable running state; wherein the steady operation state comprises: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range, wherein the pressure threshold range is related to a steam inlet pressure set value.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 5 is a block diagram of an electronic device 700, according to an example embodiment. As shown in fig. 5, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
The processor 701 is configured to control the overall operation of the electronic device 700, so as to complete all or part of the steps in the control method of the high-pressure steam source of the small turbine.
The memory 702 is used to store various types of data to support operation on the electronic device 700, which may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk.
The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises 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 may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), digital signal processors (Digital Signal Processor, abbreviated as DSP), digital signal processing devices (Digital Signal Processing Device, abbreviated as DSPD), programmable logic devices (Programmable Logic Device, abbreviated as PLD), field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGA), controllers, microcontrollers, microprocessors, or other electronic components for performing the control method of the small turbine high pressure steam source described above.
In another exemplary embodiment, a computer readable storage medium is also provided, comprising program instructions which, when executed by a processor, implement the steps of the method of controlling a high pressure steam source of a small turbine as described above. For example, the computer readable storage medium may be the memory 702 including program instructions described above, which may be executed by the processor 701 of the electronic device 700 to perform the method of controlling the high pressure steam source of the small turbine described above.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A method for controlling a high pressure steam source of a small turbine, the method comprising:
acquiring a first steam inlet pressure parameter of the small turbine when the high-pressure steam source is only five sections of steam extraction in real time;
determining whether the first steam inlet pressure corresponding to the first steam inlet pressure parameter is smaller than a preset pressure value;
if the first steam inlet pressure is determined to be smaller than the preset pressure value, controlling a high-pressure steam source switching valve to be opened;
obtaining a second inlet pressure parameter corresponding to the process of conveying the mixed high-pressure steam source to the small turbine through an inlet regulating valve, wherein the mixed high-pressure steam source comprises: the five-section steam extraction and cold re-steam extraction through the high-pressure steam source switching valve;
regulating and controlling the flow of the mixed high-pressure steam source entering the small steam turbine in real time so as to control the small steam turbine in a stable running state; wherein the steady operation state includes: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range, wherein the pressure threshold range is related to a steam inlet pressure set value.
2. The method for controlling a high-pressure steam source of a small turbine according to claim 1, wherein the real-time regulation of the flow rate of the mixed high-pressure steam source entering the small turbine comprises:
regulating and controlling the flow of the mixed high-pressure steam source entering the small steam turbine according to a preset slip pressure control curve of the steam inlet pressure set value and the water inlet pressure set value, wherein the slip pressure control curve is used for representing the corresponding relation between the water inlet pressure set value and the water inlet pressure set value.
3. The method for controlling a high-pressure steam source of a small turbine according to claim 2, further comprising:
when the water supply flow is positioned in a water supply flow anti-tracking interval preset by the sliding pressure control curve, determining whether the current actual steam inlet pressure value is smaller than a steam inlet pressure set value corresponding to the current actual steam inlet pressure value;
and if the current actual steam inlet pressure value is determined to be smaller than the steam inlet pressure set value corresponding to the current actual steam inlet pressure value, controlling the steam inlet pressure value to increase until the current actual steam inlet pressure value reaches the steam inlet pressure set value corresponding to the current actual steam inlet pressure value.
4. A method for controlling a high-pressure steam source of a small turbine according to claim 3, wherein if it is determined that the current actual steam inlet pressure value is smaller than the set value of the steam inlet pressure corresponding to the current actual steam inlet pressure value, controlling the increase of the steam inlet pressure value comprises:
determining whether the difference value between the current actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value exceeds a first deviation preset value;
and if the difference value between the current actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value exceeds the first deviation preset value, controlling the opening rising speed of the high-pressure steam source switching valve to increase so as to increase the opening speed of the high-pressure steam source switching valve.
5. The method for controlling a high-pressure steam source of a small turbine according to claim 1, further comprising:
determining whether the opening degree of the steam inlet regulating valve exceeds a first preset opening degree;
if the opening degree of the air inlet regulating valve is determined to exceed the first preset opening degree, calculating a pressure setting correction value of the air inlet regulating valve according to a first expression, wherein the first expression is as follows:
ΔP＝0+(IVO-55％)*0.015
wherein ΔP is used for representing a pressure setting correction value of the inlet air regulating valve, and IVO is used for representing the opening of the inlet air regulating valve;
and adjusting the set value of the steam inlet pressure of the steam inlet regulating valve according to the pressure setting correction value, and correcting the opening of the steam inlet regulating valve according to the adjusted set value of the steam inlet pressure.
6. The method for controlling a high-pressure steam source of a small turbine according to claim 1, further comprising:
alerting upon at least one of:
the high-pressure steam source switching valve has servo faults;
the opening of the steam inlet regulating valve is larger than a second preset opening;
the actual inlet steam pressure value of the small steam turbine is larger than a pressure preset threshold value;
at least one displacement sensor fault for measuring the opening of an inlet valve of the high-pressure steam source switching valve is arranged in the high-pressure steam source switching valve;
the feedback deviation between at least two displacement sensors in the high-pressure steam source switching valve is larger than a preset feedback deviation value;
the deviation value between the actual steam inlet pressure value of the small steam turbine and the corresponding steam inlet pressure set value is larger than a second deviation preset value.
7. The method for controlling a high-pressure steam source of a small turbine according to claim 1, further comprising:
after the high-pressure steam source electric door is opened, dewatering is performed before the high-pressure steam source switching valve is opened;
determining whether the wall temperature of the hydrophobic point exceeds a preset temperature value;
if the pipe wall temperature of the drain point is determined to be higher than the preset temperature value, controlling the high-pressure steam source switching valve to be opened, determining whether the steam inlet temperature descending speed of the small steam turbine is higher than a first preset speed, and if the steam inlet temperature descending speed is determined to be higher than the first preset speed, closing the high-pressure steam source switching valve, and when the steam inlet temperature descending speed of the small steam turbine is lower than a second preset speed, controlling the high-pressure steam source switching valve to be opened;
and if the pipe wall temperature of the drain point is not higher than the preset temperature value, the high-pressure steam source switching valve is kept closed.
8. A control device for a high pressure steam source of a small turbine, the control device comprising:
the first acquisition module is configured to acquire first steam inlet pressure parameters of the small turbine when the high-pressure steam source is only five sections of steam extraction in real time;
the control module is configured to determine whether the first steam inlet pressure corresponding to the first steam inlet pressure parameter is smaller than a preset pressure value;
the control module is further configured to control the high-pressure steam source switching valve to be opened if the first steam inlet pressure is determined to be smaller than the preset pressure value;
a second acquisition module configured to acquire a corresponding second inlet pressure parameter when delivering a mixed high pressure steam source to the small turbine via an inlet modulation valve, wherein the mixed high pressure steam source comprises: the five-section steam extraction and cold re-steam extraction through the high-pressure steam source switching valve;
the control module is further configured to regulate and control the flow of the mixed high-pressure steam source entering the small steam turbine in real time so as to control the small steam turbine to be in a stable running state; wherein the steady operation state includes: the second steam inlet pressure corresponding to the second steam inlet pressure parameter is in a pressure threshold range, and the rotating speed of the small steam turbine is in a preset rotating speed range, wherein the pressure threshold range is related to a steam inlet pressure set value.
9. An electronic device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to perform the steps of the method of any of claims 1-7.
10. A computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the method of any of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310004683.7A CN116085071A (en) | 2023-01-03 | 2023-01-03 | Control method and device for high-pressure steam source of small steam turbine and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310004683.7A CN116085071A (en) | 2023-01-03 | 2023-01-03 | Control method and device for high-pressure steam source of small steam turbine and electronic equipment |
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| CN116085071A true CN116085071A (en) | 2023-05-09 |
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| CN202310004683.7A Pending CN116085071A (en) | 2023-01-03 | 2023-01-03 | Control method and device for high-pressure steam source of small steam turbine and electronic equipment |
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| Country | Link |
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| CN (1) | CN116085071A (en) |
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2023
- 2023-01-03 CN CN202310004683.7A patent/CN116085071A/en active Pending
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