CN113669717B - Method and device for automatically controlling water supply and storage medium - Google Patents
Method and device for automatically controlling water supply and storage medium Download PDFInfo
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- CN113669717B CN113669717B CN202110807885.6A CN202110807885A CN113669717B CN 113669717 B CN113669717 B CN 113669717B CN 202110807885 A CN202110807885 A CN 202110807885A CN 113669717 B CN113669717 B CN 113669717B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
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Abstract
The present disclosure provides a method and apparatus for automatically controlling water supply. Comprising the following steps: and generating a first operation result and a real-time opening adjusting instruction of an outlet adjusting door of the recirculation pump according to the acquired parameter signals in the starting process of the unit and the received recirculation flow set value. And controlling the bypass water supply regulating door, performing proportional integral operation according to the deviation between the water supply flow set value and the water supply flow actual value, generating a second operation result and generating a bypass water supply regulating door opening regulating instruction. And controlling the rotation speed of the water feeding pump, and controlling the water feeding pump to be switched into an automatic operation state when a preset condition is met. The technical scheme provided by the embodiment of the disclosure changes the high-strength working mode that the conventional starting process needs to manually monitor multiple parameters and operate multiple devices, and avoids the risks of incapacitation of manual monitoring and misoperation of the devices.
Description
Technical Field
The disclosure relates to the technical field of industrial automation, in particular to a water supply automatic control method and device for an ultra-supercritical thermal power generating unit in single steam-driven water supply pump configuration and a computer readable storage medium.
Background
The domestic coal-fired power plant water supply pump is provided with three electric pumps (mainly air cooling units), two steam pumps, one electric pump, two steam pumps, one steam-electric pump, a single steam pump and the like. In recent years, the high-capacity thermal power generator set slowly tends to a single steam pump, so that the efficiency of the pump can be improved, and the station service electricity can be saved. At present, most of the automatic water supply control research units in China are in the form of two steam pumps and one electric pump, the single steam pump automatic water supply control has the application of water supply control after CCS input, and the automatic water supply control research is not performed in the whole starting process at present, particularly in the unit starting stage under the single steam pump configuration mode.
However, the unit starting stage is the stage with the maximum strength of an operator monitoring disc and the maximum operation frequency, the water storage tank liquid level, the recirculation flow and the water supply flow are considered manually in the water supply control, particularly in the wet heating stage, high-strength monitoring and control operation is needed manually at the moment, and the operation of a water supply valve, the rotation speed of a steam pump and the instruction of the coal supply amount is needed to be frequently performed manually in the process of switching the boiler from the wet state to the dry state. Therefore, there is a risk that manual monitoring is not in place and that the equipment is mishandled easily.
Disclosure of Invention
The embodiment of the disclosure provides a method and a device for automatically controlling water supply, which are used for solving the problems that the starting process needs to manually monitor multiple parameters and operate multiple devices in a high-strength working mode, and avoiding the risks of insufficient manual monitoring and misoperation of the devices.
Embodiments of the present disclosure also provide a computer-readable storage medium.
The embodiment of the disclosure adopts the following technical scheme:
an automatic control method for water supply is used in a thermal power unit with a single steam feed pump for an ultra-supercritical once-through boiler, and is characterized by comprising the following steps:
the method comprises the steps of obtaining parameter signals in a unit starting process, wherein the parameter signals are collected by a signal collection module, and receiving a recirculation flow set value through a human-computer interface module, and the parameter signals comprise: an actual recirculation flow and an actual feedwater flow;
performing proportional integral operation according to the deviation between a recirculation flow set value and an actual recirculation flow value to generate a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result;
controlling a bypass water supply regulating door to keep a preset opening, performing proportional integral operation according to the deviation between a water supply flow set value and a water supply flow actual value when the water supply flow reaches a first switching condition, generating a second operation result, and generating a bypass water supply regulating door opening regulating instruction according to the second operation result;
and controlling the water feed pump to operate at a default rotating speed value until the opening of the bypass water feed regulating door reaches a second switching condition, and controlling the water feed pump to switch to an automatic operation state after controlling the rotating speed of the water feed pump to switch to a target rotating speed value to operate for a set period of time.
The utility model provides a feedwater automatic control device for in ultra supercritical once-through boiler joins in marriage single steam feed pump thermal power generating unit, the device includes man-machine interface module, signal acquisition module, core controller and instruction output module, its characterized in that:
the human-computer interface module is used for receiving an operation instruction input by an operator, inputting a control signal by the operator through a button presented by the human-computer interface module and receiving a recirculation flow set value;
the signal acquisition module is used for acquiring parameter signals in the starting process of the unit, and the parameter signals comprise: an actual recirculation flow and an actual feedwater flow;
the core controller comprises a recirculation pump outlet regulating gate controller, a water supply regulating gate controller and a water supply pump rotating speed command switcher,
the recirculation pump outlet regulating door controller is used for performing proportional integral operation according to the deviation between a recirculation flow set value and the recirculation flow actual value, generating a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result;
the water supply regulating door controller is composed of an instruction switcher and a proportional-integral arithmetic unit, wherein the instruction switcher controls the bypass water supply regulating door to keep a preset opening, and when the water supply flow reaches a first switching condition, the controller is switched to the proportional-integral arithmetic unit, wherein the proportional-integral arithmetic unit carries out proportional-integral arithmetic according to the deviation of a water supply flow set value and a water supply flow actual value, a second arithmetic result is generated, and a bypass water supply regulating door opening regulating instruction is generated according to the second arithmetic result;
the water supply pump rotating speed command switcher is used for controlling the water supply pump to operate at a default rotating speed value until the opening of the bypass water supply adjusting door reaches a second switching condition, and controlling the water supply pump to switch to an automatic operation state after controlling the water supply pump rotating speed to switch to a target rotating speed value for a set period of time;
the instruction output module is used for outputting control instructions.
The utility model provides a core controller for feedwater automatic control for in ultra supercritical once-through boiler joins in marriage single steam feed pump thermal power generating unit which characterized in that: the core controller comprises a recirculation pump outlet regulating door controller, a water supply regulating door controller and a water supply pump rotating speed command switcher.
The recirculation pump outlet regulating door controller is used for performing proportional integral operation according to the deviation between a recirculation flow set value and the recirculation flow actual value, generating a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result;
the water supply regulating door controller consists of an instruction switcher and a proportional-integral arithmetic unit, wherein the instruction switcher controls the bypass water supply regulating door to keep a preset opening degree, and the bypass water supply regulating door controller is switched to the proportional-integral arithmetic unit after reaching a first switching condition, wherein the proportional-integral arithmetic unit performs proportional-integral arithmetic according to the deviation of a water supply flow set value and a water supply flow actual value to generate a second arithmetic result, and generates a bypass water supply regulating door opening degree regulating instruction according to the second arithmetic result;
and the water supply pump rotating speed command switcher controls the water supply pump to operate at a default rotating speed value until the opening of the bypass water supply adjusting door reaches a second switching condition, and controls the water supply pump to switch to an automatic operation state after the rotating speed of the water supply pump is controlled to switch to a target rotating speed value to operate for a set period of time.
The above-mentioned at least one technical scheme that the embodiment of the disclosure adopted can reach following beneficial effect:
the present disclosure is directed to a thermal power unit with a single steam feed pump for an ultra-supercritical once-through boiler, and designs an automatic control method and an automatic controller device for the whole cold start process of the unit. In the starting process of the unit, operators can achieve the ideal water supply control effect of the whole starting process of the unit by manually correcting the recirculation flow set value, the water supply flow set value and operating the water supply switching button to control the switching time according to the actual working condition. The high-strength working mode that the conventional starting process needs to manually monitor multiple parameters and operate multiple devices is changed, and the risks of insufficient manual monitoring and misoperation of the devices are avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a specific flow chart of an automatic water supply control method according to an embodiment of the disclosure;
FIG. 2 is a schematic view of a water supply automatic control device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a core controller of the present disclosure.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the drawings and specific examples thereof, together with the following description. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present disclosure. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
At present, the water supply equipment of the thermal power generating unit adopting a single steam pump mode mainly comprises: the system comprises a feed pump, a main feed water gate, a feed water bypass regulating gate, a steam-water separator, a boiler recirculation pump and a boiler recirculation regulating gate. The start-up phase of the unit is roughly divided into: cold flushing of the boiler, ignition of the boiler, hot cleaning of the boiler, wet heating and boosting operation, flushing and turning of the steam turbine, grid connection, wet turning to dry (in the process, operators switch bypass water supply to main water supply through valve operation), dry heating and boosting to 40% of load, and then CCS is put into operation. The input of CCS marks the end of the unit start-up phase.
The process before the wet state changes to the dry state is called the wet state of the boiler, and then the wet state changes to the dry state.
At present, no automatic water supply control logic is provided for the wet state and the wet state to dry state process of the boiler, or the control logic is not subjected to a full adjustment test, so that the automatic adjustment control effect cannot be achieved. The whole process of the unit starting is realized by manual control, and operators need to manually input opening instructions of valves, rotating speed instructions or flow instructions of a feed pump on a DCS operation computer so as to obtain required feed water flow and boiler recycling flow. Thus, the operator is simultaneously concerned with the operation of the three devices of the feedwater bypass modulation gate, feedwater pump speed, and boiler recirculation modulation gate.
In order to change the high-intensity working mode that the conventional starting process needs to manually monitor multiple parameters and operate multiple devices, and avoid the risks of insufficient manual monitoring and misoperation of the devices, the present disclosure provides a novel water supply control method and a novel water supply control device.
After the water supply control method is adopted, no manual operation is needed in the process of changing the wet state of the boiler from the wet state to the dry state. The required recirculation water flow is set by correcting the preset water supply flow through the water supply flow manual correction input window and the recirculation water flow manual setting window.
The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.
Example 1
In order to solve the problem that in the prior art, a starting process needs to manually perform high-intensity working modes of multi-parameter monitoring and multi-equipment operation, the embodiment of the invention provides a method for automatically controlling water supply, which is used for a thermal power unit with a single steam feed pump for an ultra-supercritical once-through boiler, and a specific implementation flow chart of the method is shown in figure 1, and comprises the following steps:
s1, acquiring parameter signals acquired by a signal acquisition module in the starting process of a unit, and receiving a recirculation flow set value through a human-computer interface module, wherein the parameter signals comprise: actual recirculation flow and actual feedwater flow.
The core controller acquires the actual value of the water supply flow, the actual value of the recirculation flow, the liquid level of the water storage tank, the fuel quantity, the opening of the recirculation valve, the opening of the bypass water supply regulating valve, the rotating speed signal of the pneumatic water supply pump, the automatic output value of the water supply pump and the manual correction signals of the recirculation flow set value and the water supply flow set value received from the man-machine interface in real time through the signal acquisition module, and calculates to give the opening instruction of the recirculation valve, the opening instruction of the water supply bypass valve and the rotating speed instruction of the pneumatic water supply pump, so as to control various parameter indexes of the water supply system in the whole starting process to be in good states.
S2, performing proportional integral operation according to deviation of a recirculation flow set value and an actual recirculation flow value, generating a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result.
And the recirculation pump outlet regulating door controller adopts deviation between a recirculation flow set value and an actual value to carry out proportional integral operation to obtain a recirculation pump outlet regulating door real-time opening instruction, and a proportional coefficient and integral time are obtained by a thermal control engineer according to the working condition of a production site by using a worker Cheng Jingyan method. The actual value of the recirculation flow is read by the controller from the power plant DCS system. The recirculation flow set value is formed by adding a first artificial correction value, a 4-order function value of a coal feeding quantity signal and a liquid level deviation value of a water storage tank, wherein the first artificial correction value is used for adapting to the flow requirement which needs to be manually adjusted according to actual conditions when cold and hot cleaning is performed, the coal feeding quantity function overcomes the system disturbance caused by water evaporation when the boiler ignites and the coal quantity is increased, the liquid level deviation value of the water storage tank is used for rapidly adjusting the flow when the working condition of the system is unstable, and the liquid level is stabilized by matching with a 360-valve, so that the operation safety of the recirculation pump is ensured.
And S3, controlling the bypass water supply regulating door to keep the preset opening, performing proportional integral operation according to the deviation of the water supply flow set value and the water supply flow actual value when the water supply flow reaches the first switching condition, generating a second operation result, and generating a bypass water supply regulating door opening regulating instruction according to the second operation result.
The default output instruction of the instruction switcher of the water supply regulating door controller is 10%, the bypass water supply regulating door is controlled to keep 10% of opening, and the water supply regulating door is switched to a proportional integral arithmetic unit after reaching a first switching condition, wherein the proportional integral arithmetic unit outputs the opening instruction of the bypass water supply regulating door after carrying out proportional integral arithmetic according to the deviation between a water supply flow set value and a water supply flow actual value.
The water supply regulating door controller consists of a command switcher and a proportional integral arithmetic unit, wherein the command switcher defaults to output a command of 10%, so that the bypass regulating door keeps 10% of opening degree, and the unstable system caused by orifice plate measurement fluctuation under the working condition of small flow at the initial stage of starting is eliminated. When the switching condition is reached (the water supply flow is greater than 850t/h, the time is delayed for 10 minutes), the switching is performed to a proportional integral arithmetic unit (the bypass water supply regulating door opening command is output after the proportional integral arithmetic is performed on the deviation between the water supply flow set value and the actual value). The water supply flow set value is formed by adding a flow switcher and a manual correction value, and the flow switcher outputs 900t/h by default, so that the flow required during the starting period is met; after reaching the switching condition (clicking the main bypass switching button manually), the water supply main bypass is switched to 1200t/h, and then manual correction is overlapped to ensure that the opening of the bypass regulating door reaches more than 70 percent before the automatic switching operation of the water supply main bypass. After the water feeding pump is automatically put into operation, the controller instructs the switcher to output an instruction to switch to 100% of instructions calculated by an inertia link, so that the bypass door is slowly opened to 100%, and the bypass door fully-opened signal triggers the main water feeding door fully-opened instruction to finish the automatic operation of water feeding main bypass switching.
And S4, controlling the water supply pump to operate at a default rotating speed value, and controlling the water supply pump to switch to an automatic operation state after controlling the rotating speed of the water supply pump to switch to a target rotating speed value to operate for a set period of time when the opening degree of the bypass water supply adjusting door reaches a second switching condition.
Specifically, a default output water feeding pump rotation speed value may be set to 2400rpm, whether a second switching condition is currently reached is determined, when the second switching condition is reached, the water feeding pump rotation speed is switched to 3000rpm, and after the water feeding pump rotation speed reaches 3000rpm and is delayed for 5 minutes, an automatic input signal is generated, and the automatic input signal triggers the water feeding pump rotation speed command switcher to switch to the water feeding pump automatic input stage.
The feedwater pump speed command switch defaults to 2400rpm. Avoiding the critical range 2650-2850 rpm of the water feeding pump turbine, and meeting the requirement that the cleaning flow is not lower than 850t/h. After reaching the switching condition (the opening of the bypass door is more than 70 percent and delayed for 1 minute), the speed is switched to 3000rpm, and after reaching the set value and being delayed for 5 minutes, the automatic water feeding pump is put into the water feeding pump, and the automatic input signal triggers the command switch to output and switch to the automatic output value of the conventional water feeding pump.
After the method is adopted, no manual operation of any equipment is needed in the process of changing the wet state and the wet state of the boiler into the dry state. The required recirculation water flow is set by correcting the preset water supply flow through the water supply flow manual correction input window and the recirculation water flow manual setting window.
After the conventional power plant turns to a dry state, the water supply door and the water supply door bypass regulating door are opened to 100 percent of opening, and the water supply pump recycling regulating door is closed to 0 percent. The water supply flow command of the water supply pump is output by the DCS water supply main controller without regulation, and is not manually set by operators. The controller also exits operation after a dry state is reached.
Example 2
Fig. 2 shows a schematic structural view of an automatic water supply control device according to an embodiment of the present disclosure. As shown in fig. 2, the automatic water supply control device 1 includes a human-machine interface module 12, a signal acquisition module 13, a core controller 14, and a command output module 15. The water supply automatic control device is connected to the DCS system 2 of the power plant, and can read data from the DCS system 2.
The man-machine interface module 12 is configured to receive an operation instruction input by an operator, and the operator inputs a control signal through a button presented by the man-machine interface module. The control system is used for receiving an operation instruction input by an operator, the operator inputs a control signal through a button presented by the human-computer interface module, and the recirculation flow set value is received. The operation instruction is input through the human-machine interface presented by the human-machine interface module, an operator can input the recirculation flow manual correction value, the water supply flow manual correction value and the main bypass switching button through the operation window of the human-machine interface, and the recirculation flow manual correction value, the water supply flow manual correction value and the main bypass switching button can be presented on the human-machine interface through the human-machine interface module. When the main bypass is switched, a switch confirmation button is arranged on the man-machine interface, the button is lightened to be operable after the conditions are met, and after a person presses the button, the controller finishes the operation of the related valve for switching the water supply bypass to the main bypass. Because the unit is connected with the power system to generate power at the moment, the fact that other related systems except the system in the thermal power unit are operated normally and can be switched needs to be confirmed manually.
The signal acquisition module 13 is used for acquiring parameter signals in the starting process of the unit. The signal acquisition module acquires the actual value of the water supply flow, the liquid level of the water storage tank, the fuel quantity, the opening of the recirculation valve, the opening of the bypass water supply regulating valve, the rotating speed signal of the pneumatic water supply pump, the automatic output value of the water supply pump, and the manual correction signal of the recirculation flow set value and the water supply flow set value received from the human-computer interface in real time, and calculates to give the opening instruction of the recirculation valve, the opening instruction of the water supply bypass valve and the rotating speed instruction of the pneumatic water supply pump, so that all parameter indexes of the water supply system in the whole starting process are controlled to be in good states.
The core controller 14 includes a recirculation pump outlet regulator gate controller, a feedwater regulator gate controller, and a feedwater pump speed command switch. Is a core component for providing automatic control of water supply, which acquires parameters of a water supply system and gives corresponding control instructions according to calculation results so as to control the water supply.
The instruction output module 14 is configured to output a control instruction. The command output module 14 outputs the control command obtained by the core controller to a corresponding device, for example, outputs the calculated recirculation valve opening command, feedwater bypass valve opening command, and steam-driven feedwater pump rotational speed command to a corresponding control device, and controls the opening of the valve and the rotational speed of the water pump. The boiler recirculation valve opening command is used for controlling the boiler recirculation regulating valve opening, so that the boiler recirculation water flow is changed, but the boiler water flow is influenced. The water supply bypass opening command is used for controlling the opening of the water supply bypass regulating door so as to change the water supply flow of the boiler and control the water supply flow of the boiler before the water supply bypass is switched to the main path. The feed pump rotation speed command is used for controlling the feed pump rotation speed so as to change the feed water flow of the boiler, and the feed water flow of the boiler is controlled after the feed water bypass is switched to the main path. The boiler feedwater flow is controlled in an auxiliary manner before the feedwater bypass is switched to the main path.
The boiler starting process of the thermal power generating unit is a continuous coal and water adding process, so that the water supply flow and the recirculation flow need to be concerned at any time in the conventional starting process, and the water supply flow and the recirculation flow need to be monitored and adjusted at any time due to the discharge of cleaning sewage of the boiler, particularly, the heated evaporation loss of the water supply after the boiler is ignited, and the water supply flow and the recirculation flow are in an unstable state. Too high flow can cause boiler water filling accidents, and too low flow can cause cavitation damage of a pump and overtemperature of the boiler, and dry combustion. The scheme provided by the embodiment realizes the automatic control of water supply before the dry state, and even if special conditions occur, personnel do not timely correct the manual instructions, the cleaning and starting time is only increased, and the boiler protection action and equipment damage can not be caused. The monitoring and operation intensity and pressure of operators are greatly reduced.
Example 3
Fig. 3 shows a core controller for automatically controlling water supply, which is used for a supercritical once-through boiler and is matched with a single steam feed pump thermal power unit, wherein the core controller 14 comprises a recirculation pump outlet regulating gate controller 21, a feed water regulating gate controller 22 and a feed water pump rotating speed command switcher 23.
The recirculation pump outlet regulating door controller 21 is configured to perform proportional integral operation according to a deviation between the recirculation flow set value and the recirculation flow actual value to obtain a recirculation pump outlet regulating door real-time opening command.
And the recirculation pump outlet regulating door controller adopts deviation between a recirculation flow set value and an actual value to carry out proportional integral operation to obtain a recirculation pump outlet regulating door real-time opening instruction, and a proportional coefficient and integral time are obtained by a thermal control engineer according to the working condition of a production site by using a worker Cheng Jingyan method. The actual value of the recirculation flow is read by the controller from the power plant DCS system. The recirculation flow set value is formed by adding a first artificial correction value, a 4-order function value of a coal feeding quantity signal and a liquid level deviation value of a water storage tank, wherein the first artificial correction value is used for adapting to the flow requirement which needs to be manually adjusted according to actual conditions when cold and hot cleaning is performed, the coal feeding quantity function overcomes the system disturbance caused by water evaporation when the boiler ignites and the coal quantity is increased, the liquid level deviation value of the water storage tank is used for rapidly adjusting the flow when the working condition of the system is unstable, and the liquid level is stabilized by matching with a 360-valve, so that the operation safety of the recirculation pump is ensured.
The water supply regulating gate controller 22 is composed of a command switcher and a proportional integral arithmetic unit, wherein the command switcher defaults to output a command of 10%, controls the bypass water supply regulating gate to keep 10% of opening, and switches to the proportional integral arithmetic unit after reaching a first switching condition, wherein the proportional integral arithmetic unit outputs the opening command of the bypass water supply regulating gate after performing proportional integral arithmetic according to the deviation between a water supply flow set value and a water supply flow actual value.
The water supply regulating door controller consists of a command switcher and a proportional integral arithmetic unit, wherein the command switcher defaults to output a command of 10%, so that the bypass regulating door keeps 10% of opening degree, and the unstable system caused by orifice plate measurement fluctuation under the working condition of small flow at the initial stage of starting is eliminated. When the switching condition is reached (the water supply flow is greater than 850t/h, the time is delayed for 10 minutes), the switching is performed to a proportional integral arithmetic unit (the bypass water supply regulating door opening command is output after the proportional integral arithmetic is performed on the deviation between the water supply flow set value and the actual value). The water supply flow set value is formed by adding a flow switcher and a manual correction value, and the flow switcher outputs 900t/h by default, so that the flow required during the starting period is met; after reaching the switching condition (clicking the main bypass switching button manually), the water supply main bypass is switched to 1200t/h, and then manual correction is overlapped to ensure that the opening of the bypass regulating door reaches more than 70 percent before the automatic switching operation of the water supply main bypass. After the water feeding pump is automatically put into operation, the controller instructs the switcher to output an instruction to switch to 100% of instructions calculated by an inertia link, so that the bypass door is slowly opened to 100%, and the bypass door fully-opened signal triggers the main water feeding door fully-opened instruction to finish the automatic operation of water feeding main bypass switching.
The feed pump rotation speed command switcher 23 is configured to control the feed pump rotation speed, and the feed pump rotation speed command switcher defaults to 2400rpm, determines whether a second switching condition is currently reached, switches the feed pump rotation speed to 3000rpm when the second switching condition is reached, and generates an automatic input signal after the feed pump rotation speed reaches 3000rpm and delays for 5 minutes, where the automatic input signal triggers the feed pump rotation speed command switcher to switch to an automatic feed pump input stage.
The feedwater pump speed command switch defaults to 2400rpm. Avoiding the critical range 2650-2850 rpm of the water feeding pump turbine, and meeting the requirement that the cleaning flow is not lower than 850t/h. After reaching the switching condition (the opening of the bypass door is more than 70 percent and delayed for 1 minute), the speed is switched to 3000rpm, and after reaching the set value and being delayed for 5 minutes, the automatic water feeding pump is put into the water feeding pump, and the automatic input signal triggers the command switch to output and switch to the automatic output value of the conventional water feeding pump.
Example 4
Taking a No. 2 machine set of a Jiujiang power plant in China as an example, the boiler is an ultra-supercritical parameter variable-pressure direct-current boiler, and a single-hearth, front-back wall opposite-firing mode is adopted; an external steam-water separator is provided with a furnace water recirculation system with the through-flow capacity not less than 25% of BMCR flow; the water supply pump turbine is of a single cylinder type, a final stage double-split type, a single shaft type, a double-drive type, an impulse type, a lower exhaust steam condensing type and an external switching type; the water supply main passage flow capacity is 100%, the water supply bypass flow capacity is 30%, and a bypass regulating door is designed; the DCS control system of the unit is a time-of-utilization MASC6 system.
Because the MASC6 system has configuration development, the control device can be integrated in a set DCS control system, and a man-machine interaction interface and a signal acquisition and instruction output function of the DCS system are called to complete a control function. The core controller function is logically configured according to the description in the technical content of the part 5, and the proportional coefficient and the integral time are obtained by debugging a thermal control engineer according to the working condition of the production site by using a method Cheng Jingyan.
In the starting process of the unit, after the water feeding pump is started and the water injection of the boiler is completed, an operator can input the automatic control function of the core controller through a human-computer interface button, the controller controls the rotation speed of the water feeding pump to 2400rpm, the opening of the bypass regulating door is 10%, and the recirculation flow is controlled in a set value range. At the moment, operators can control the size of the recirculation flow through manually modifying the recirculation flow set value, so as to achieve the cleaning effect meeting the requirements. Because the boiler cleaning flow is required to be greater than 850t/h, when the operator changes the recirculation flow to enable the water supply flow to be greater than 850t/h, the water supply flow of the bypass regulating door is controlled to be input in a closed loop mode, and the water supply flow is controlled to be maintained at 900t/h. In the ignition, temperature rise and pressure rise processes of the boiler, the set value of the recirculation flow changes along with the change of the coal quantity and the change of the liquid level of the water storage tank, so that the influence of the evaporation quantity of water supply and the influence of the fluctuation of the liquid level of the water storage tank are balanced, and the operation safety of the system is ensured. And after the boiler is heated and boosted, the dry and wet state conversion is finished, the recirculation system is stopped, an operator controls the automatic implementation of the switching of the water supply main bypass through a human-computer interface button, the water supply flow set value is automatically modified to 1200t/h in the process, and the operator ensures that the bypass opening is more than 70% by changing the water supply flow correction value. After the bypass door opening is greater than 70% and a delay of 1 minute, the feed pump speed command is switched to 3000rpm. After the rotational speed reached 3000rpm and was delayed for 5 minutes, the feed water flow rate to the feed water pump was closed-loop controlled. After the water feeding pump is automatically put into operation, the controller controls the bypass door to be slowly opened to 100%, and after the bypass door is fully opened, the controller controls the main water feeding door to be fully opened. The recirculation system is withdrawn, the water supply valve is fully opened, the water supply pump is controlled by the water supply main control, and the controller is completed in function and withdrawn from operation.
In addition, the embodiment of the disclosure also provides an automatic water supply control device, which comprises: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the feedwater automatic control method as provided in the foregoing embodiments.
The disclosed embodiments also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the feedwater automatic control method as provided in the foregoing embodiments.
By adopting the scheme provided by the embodiment of the invention, operators can control the switching time by manually correcting the recirculation flow set value, the water supply flow set value and operating the water supply switching button according to the actual working condition in the starting process of the unit, so that the ideal water supply control effect of the whole starting process of the unit can be achieved. The high-strength working mode that the conventional starting process needs to manually monitor multiple parameters and operate multiple devices is changed, and the risks of insufficient manual monitoring and misoperation of the devices are avoided.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.
Claims (8)
1. An automatic control method for water supply, which is used for a thermal power unit with a single steam feed pump for an ultra-supercritical once-through boiler, is characterized by comprising the following steps:
the method comprises the steps of obtaining parameter signals in a unit starting process, wherein the parameter signals are collected by a signal collection module, and receiving a recirculation flow set value through a human-computer interface module, and the parameter signals comprise: an actual recirculation flow and an actual feedwater flow;
performing proportional integral operation according to the deviation between a recirculation flow set value and an actual recirculation flow value to generate a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result;
controlling a bypass water supply regulating door to keep a preset opening, performing proportional integral operation according to the deviation between a water supply flow set value and a water supply flow actual value when the water supply flow reaches a first switching condition, generating a second operation result, and generating a bypass water supply regulating door opening regulating instruction according to the second operation result;
controlling a water supply pump to operate at a default rotating speed value until the opening of a bypass water supply regulating door reaches a second switching condition, and controlling the water supply pump to switch to an automatic operation state after controlling the rotating speed of the water supply pump to switch to a target rotating speed value to operate for a set period of time;
the first switching condition is that the water supply flow is greater than 850t/h and the delay is 10 minutes; the second switching condition is that the opening of the bypass water supply regulating door is more than 70 percent and the bypass water supply regulating door is delayed for 1 minute.
2. The method according to claim 1, characterized in that: the parameter signals in the starting process also comprise the liquid level of the water storage tank, the fuel quantity, the opening of the recirculation valve, the opening of the bypass water supply regulating valve, the rotating speed value of the water supply pump and the automatic output value of the water supply pump;
the recirculation flow set value is formed by adding a first artificial correction value, a 4-order function value of a coal supply signal and a water storage tank liquid level deviation value, wherein the first artificial correction value is a correction value input by operators during cold and hot state cleaning, the 4-order function value of the coal supply signal can overcome system disturbance caused by water supply evaporation when boiler ignition and coal supply are increased, the water storage tank liquid level deviation value is used for rapidly adjusting flow when a water supply system working condition is unstable, and the water storage tank liquid level deviation value is matched with a 360-valve stable liquid level to ensure the operation safety of a recirculation pump.
3. The method according to claim 1, characterized in that: the water supply flow set value is formed by adding a flow switcher output value and a second manual correction value, the default output value of the flow switcher is 900t/h, after a main bypass switching signal is received, the flow switcher output value is switched to 1200t/h, and the second manual correction value is overlapped, so that the opening of a bypass water supply regulating door reaches more than 70%;
after the water feeding pump is automatically put into operation, controlling the opening of the bypass water feeding regulating door to be adjusted to 100% of the opening calculated by the inertia link, triggering a full-open instruction of the main water feeding regulating door by a full-open signal of the bypass water feeding regulating door, and completing automatic switching operation of the main water feeding bypass.
4. The utility model provides a feedwater automatic control device for in ultra supercritical once-through boiler joins in marriage single steam feed pump thermal power generating unit, the device includes man-machine interface module, signal acquisition module, core controller and instruction output module, its characterized in that:
the human-computer interface module is used for receiving an operation instruction input by an operator, inputting a control signal by the operator through a button presented by the human-computer interface module and receiving a recirculation flow set value;
the signal acquisition module is used for acquiring parameter signals in the starting process of the unit, and the parameter signals comprise: an actual recirculation flow and an actual feedwater flow;
the core controller comprises a recirculation pump outlet regulating gate controller, a water supply regulating gate controller and a water supply pump rotating speed command switcher,
the recirculation pump outlet regulating door controller is used for performing proportional integral operation according to the deviation between a recirculation flow set value and the recirculation flow actual value, generating a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result;
the water supply regulating door controller is composed of an instruction switcher and a proportional-integral arithmetic unit, wherein the instruction switcher controls the bypass water supply regulating door to keep a preset opening, and when the water supply flow reaches a first switching condition, the controller is switched to the proportional-integral arithmetic unit, wherein the proportional-integral arithmetic unit carries out proportional-integral arithmetic according to the deviation of a water supply flow set value and a water supply flow actual value, a second arithmetic result is generated, and a bypass water supply regulating door opening regulating instruction is generated according to the second arithmetic result;
the water supply pump rotating speed command switcher is used for controlling the water supply pump to operate at a default rotating speed value until the opening of the bypass water supply adjusting door reaches a second switching condition, and controlling the water supply pump to switch to an automatic operation state after controlling the water supply pump rotating speed to switch to a target rotating speed value for a set period of time;
the instruction output module is used for outputting control instructions;
the first switching condition is that the water supply flow is greater than 850t/h and the delay is 10 minutes; the second switching condition is that the opening of the bypass water supply regulating door is more than 70 percent and the bypass water supply regulating door is delayed for 1 minute.
5. The apparatus according to claim 4, wherein: the parameter signals in the starting process also comprise the liquid level of the water storage tank, the fuel quantity, the opening of the recirculation valve, the opening of the bypass water supply regulating valve, the rotating speed value of the water supply pump and the automatic output value of the water supply pump;
the recirculation flow set value is formed by adding a first artificial correction value, a 4-order function value of a coal supply signal and a water storage tank liquid level deviation value, wherein the first artificial correction value is a correction value input by operators during cold and hot state cleaning, the 4-order function value of the coal supply signal can overcome system disturbance caused by water supply evaporation when boiler ignition and coal supply are increased, the water storage tank liquid level deviation value is used for rapidly adjusting flow when a water supply system working condition is unstable, and the water storage tank liquid level deviation value is matched with a 360-valve stable liquid level to ensure the operation safety of a recirculation pump.
6. The apparatus according to claim 4, wherein: the proportional-integral arithmetic unit outputs a bypass water supply regulating gate opening command after performing proportional-integral operation according to the deviation between a water supply flow set value and a water supply flow actual value, wherein the water supply flow set value is formed by adding a flow switcher output value and a second manual correction value, the default output value of the flow switcher is 900t/h, after receiving a main bypass switching signal, the flow switcher output value is switched to 1200t/h, and the second manual correction value is added, so that the bypass water supply regulating gate opening reaches more than 70%;
after the water feeding pump is automatically put into operation, controlling the opening of the bypass water feeding regulating door to be adjusted to 100% of the opening calculated by the inertia link, triggering a full-open instruction of the main water feeding regulating door by a full-open signal of the bypass water feeding regulating door, and completing automatic switching operation of the main water feeding bypass.
7. The utility model provides a core controller for feedwater automatic control for in ultra supercritical once-through boiler joins in marriage single steam feed pump thermal power generating unit which characterized in that: the core controller comprises a recirculation pump outlet regulating gate controller, a water supply regulating gate controller and a water supply pump rotating speed command switcher,
the recirculation pump outlet regulating door controller is used for performing proportional integral operation according to the deviation of the recirculation flow set value and the recirculation flow actual value, generating a first operation result, and generating a recirculation pump outlet regulating door real-time opening regulating instruction according to the first operation result;
the water supply regulating door controller consists of an instruction switcher and a proportional-integral arithmetic unit, wherein the instruction switcher controls the bypass water supply regulating door to keep a preset opening degree, and the bypass water supply regulating door controller is switched to the proportional-integral arithmetic unit after reaching a first switching condition, wherein the proportional-integral arithmetic unit performs proportional-integral arithmetic according to the deviation of a water supply flow set value and a water supply flow actual value to generate a second arithmetic result, and generates a bypass water supply regulating door opening degree regulating instruction according to the second arithmetic result;
the water supply pump rotating speed command switcher is used for controlling the water supply pump to operate at a default rotating speed value until the opening of the bypass water supply regulating door reaches a second switching condition, and controlling the water supply pump to switch to an automatic operation state after controlling the water supply pump rotating speed to switch to a target rotating speed value for a set period of time;
the first switching condition is that the water supply flow is greater than 850t/h and the delay is 10 minutes; the second switching condition is that the opening of the bypass water supply regulating door is more than 70 percent and the bypass water supply regulating door is delayed for 1 minute.
8. An automatic water supply control device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the feedwater automatic control method of any of claims 1 to 3.
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| CN114646051B (en) * | 2022-03-17 | 2023-06-23 | 国网湖南省电力有限公司 | Automatic control method and system for water supply of wet running boiler of supercritical thermal power unit |
| CN115405914A (en) * | 2022-07-22 | 2022-11-29 | 江苏南通发电有限公司 | Steam feed pump parallel-cut pump sequential control logic design optimization method |
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| CN106287656A (en) * | 2016-08-02 | 2017-01-04 | 中国神华能源股份有限公司 | The control system of water supply system and method |
| CN106801863B (en) * | 2017-02-06 | 2018-10-19 | 国家电网公司 | A kind of fired power generating unit feed water by-pass cuts the bypass valve control method during main road |
| CN110397909A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Feed-water feed-forward control system and method based on recirculation valve state of feed-water pump |
| CN210511630U (en) * | 2019-08-20 | 2020-05-12 | 华能国际电力股份有限公司 | Feed-water feedforward control system based on recirculation valve state of feed pump |
| CN110848124B (en) * | 2019-09-30 | 2021-07-16 | 国电浙能宁东发电有限公司 | Automatic switching control method and device for electric pump and steam pump and storage medium |
| CN111594825B (en) * | 2020-04-28 | 2021-12-31 | 国网河北省电力有限公司电力科学研究院 | Method for controlling recirculation valve of boiler feed pump based on rotation speed correction |
| CN112628721B (en) * | 2021-01-04 | 2023-04-14 | 国家能源集团国源电力有限公司 | Boiler wet-state operation water supply control method and device and storage medium |
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