CN112066360B - Control method for drum liquid level display, storage medium and electronic equipment - Google Patents
Control method for drum liquid level display, storage medium and electronic equipment Download PDFInfo
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Classifications
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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
- F22D5/30—Automatic feed-control systems responsive to both water level and amount of steam withdrawn or steam pressure
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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 application provides a control method for drum liquid level display, a storage medium and electronic equipment, wherein the method comprises the following steps: acquiring steam drum state information, wherein the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum steam flow, real-time steam drum liquid level and real-time water supply inlet flow; correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam flow and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level; determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow; and controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow. By implementing the application, the automatic control of the drum liquid level is realized, and the accuracy of the drum liquid level control and display is improved.
Description
Technical Field
The application relates to the technical field of boiler equipment, in particular to a control method for displaying the liquid level of a steam drum, a storage medium and electronic equipment.
Background
The boiler is an indispensable power device in the industrial process, the task of the boiler is to convey certain mass and corresponding quantity of steam according to the change of external load, the drum liquid level is an important monitoring parameter in the operation of the boiler, the dynamic balance relation between the load of the boiler and the water supply is reflected, the effect of steam-water separation can be influenced due to the fact that the liquid level is too high, and the phenomenon of steam carrying liquid is generated; the water level is too low, which can destroy the water circulation and affect the operation of the equipment, so that the water is easy to be completely vaporized to burn out the boiler and even explode, thereby timely and accurately controlling the water level within an allowable range, being suitable for the operation of various working conditions and being an important condition for ensuring the safe operation of the machine and the furnace.
Currently, most of the existing drum liquid levels adopt single impulse, double impulse control or three impulse control, wherein the single impulse control means that an auxiliary water supply controller is started to perform Proportional Integral (PI) operation on a set value and a water level measured value, the opening degree of an auxiliary water supply regulating valve is controlled, the water supply entering the drum is changed, and finally the water level is equal to the set value; the double impulse control is to control a water inlet regulating valve by taking the drum liquid level as a main controller and the water inlet flow as an auxiliary regulator; the three-impulse control is to control the water inflow of the water replenishing regulating valve by taking the liquid level of the steam drum as a main controller, taking the water inflow controller of the boiler as an auxiliary regulator, controlling the water inflow valve of the boiler, taking the steam flow as the feedforward of the water inflow controller of the boiler, taking the water inflow of the boiler as the auxiliary regulator, taking the calculation module of the liquid level and the flow as the setting of the water replenishing flow controller.
However, the existing drum liquid level control can normally control small amplitude fluctuation under the design working condition, the safe operation of the system is realized by setting alarm, override, high-low selection and interlocking in abnormal process fluctuation or the temperature rise and fall operation of the cracking furnace, and the operation personnel still need to perform judgment operation or human intervention on site in the emergency operation of abnormal process fluctuation or the temperature rise and fall operation of the cracking furnace, so that the accuracy of drum liquid level indication and the control stability of the system are low, and the automatic lifting and the safe control of the device cannot be realized.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provides a control method, a storage medium and electronic equipment for displaying the liquid level of a steam drum, which realize automatic control of the liquid level of the steam drum, improve the control and display accuracy of the liquid level of the steam drum and improve the stability and safety of a system.
The technical scheme of the application provides a control method for displaying the liquid level of a steam drum, which comprises the following steps:
acquiring steam drum state information, wherein the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum steam flow, real-time steam drum liquid level and real-time water supply inlet flow;
correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam temperature and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level;
determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow;
and controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow.
Further, the correcting the real-time steam drum steam flow according to the real-time steam drum steam temperature and the real-time steam drum steam pressure to obtain a target steam drum steam flow includes:
the pressure compensation coefficient was calculated using the following:
wherein a is the pressure compensation coefficient; p (P) x -providing said real-time drum steam pressure; p (P) 1 Is at atmospheric pressure; p (P) 0 Presetting steam pressure of a steam drum; t (T) 0 The temperature of the steam drum is preset; t (T) 1 Absolute temperature; t (T) x -for said real-time drum temperature;
and correcting the real-time steam drum steam flow according to the pressure compensation coefficient to obtain the target steam drum steam flow.
Further, the correcting the real-time steam drum steam flow according to the pressure compensation coefficient to obtain the target steam drum steam flow includes:
calculating the target drum steam flow using:
wherein q m The target drum steam flow; a is the pressure compensation coefficient; c is the outflow coefficient; beta is the aperture ratio of throttling; epsilon is the gas expansion coefficient; d is the aperture of the throttling element under the working condition; Δf is the pressure differential across the long diameter nozzle; ρ 1 The steam density is designed for working conditions; d is the upstream restrictor aperture under operating conditions.
Further, the correcting the real-time drum liquid level according to the real-time drum steam temperature and the real-time drum steam pressure to obtain a target drum liquid level includes:
the varying drum level after the pressure variation was calculated using the following:
wherein V is Steam X The volume of the constant gas phase after the pressure change; h X For said varying drum level; v (V) Liquid and its preparation method Is the volume of liquid phase; c (C) L Specific heat of water in the steam drum; c (C) V Specific heat of steam in the steam drum; c (C) LX Specific heat of water in the steam drum; c (C) VX Specific heat of steam in the steam drum; v (V) Total (S) Is the total volume of the steam drum;
and correcting the real-time drum liquid level according to the difference value between the variable drum liquid level and the real-time drum liquid level to obtain the target drum liquid level.
Further, the determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling a target water inlet flow according to the water inlet flow set value and the real-time water inlet flow, includes:
calculating a liquid level deviation value of the target drum liquid level and the preset drum liquid level, and setting the liquid level deviation value as the water inlet flow set value;
calculating the set value of the inflow water flow and the flow deviation value of the inflow water flow of the real-time water supply, and controlling the inflow water flow of the target water supply according to the flow deviation value.
Further, the drum status information further includes at least one chiller outlet flow, and the controlling of the display of the drum level based on the target drum level, the target drum steam flow, and the target feedwater inlet flow includes:
adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and at least one quencher outlet flow to obtain a drum liquid level output value;
and controlling the display of the drum liquid level according to the drum liquid level output value.
Further, the steam drum state information also comprises at least one chiller water inlet flow, the preset steam drum liquid level comprises a first preset steam drum liquid level and a second preset steam drum liquid level, the first preset steam drum liquid level is larger than the second preset steam drum liquid level,
the adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and at least one quencher inlet flow to obtain a drum liquid level output value, and the method further comprises the following steps:
when the water inlet flow rate of the quencher is greater than the first preset drum liquid level, taking the first preset drum liquid level as the water outlet flow rate of the quencher;
and when the water inlet flow rate of the quencher is smaller than the second preset drum liquid level, taking the second preset drum liquid level as the water outlet flow rate of the quencher.
Further, the controlling the display of the drum level according to the target drum level, the target drum steam flow, and the target feedwater inlet flow includes:
calculating the drum liquid level output value by using the following steps:
OP＝IP1+((IP2-50)*FSBFW/100)-IP3
wherein OP is the drum liquid level output value; IP1 is the target drum steam flow; IP2 is the target drum liquid level; FSBFW is the target water supply water inflow; IP3 is the water outlet flow of the quencher;
and controlling the display of the drum liquid level according to the drum liquid level output value.
The technical solution of the present application also provides a storage medium storing computer instructions for executing all the steps of the control method for drum level display as described above when the computer executes the computer instructions.
The technical scheme of the application also provides electronic equipment, which comprises:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform:
acquiring steam drum state information, wherein the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum liquid level and real-time water supply inlet flow;
correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam temperature and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level; determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow;
and controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow.
After the technical scheme is adopted, the method has the following beneficial effects: by acquiring the steam drum state information, the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum liquid level and real-time water supply inlet flow, the real-time steam drum steam flow and the real-time steam drum liquid level are corrected according to the real-time steam drum steam flow and the real-time steam drum steam pressure, the target steam drum steam flow and the target steam drum liquid level are obtained, the water supply inlet flow set value is determined according to the target steam drum liquid level and the preset steam drum liquid level, the target water supply inlet flow is controlled according to the water supply flow set value and the real-time water supply inlet flow, and the display of the steam drum liquid level is controlled according to the target steam drum liquid level, the target steam drum steam flow and the target water supply inlet flow, so that the automatic control of the steam drum liquid level is realized, the accuracy of the control and the display of the steam drum liquid level is improved, and the system stability and safety are improved.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. It should be understood that: the drawings are for illustrative purposes only and are not intended to limit the scope of the present application. In the figure:
FIG. 1 is a schematic diagram of the drum level control system of the present application;
FIG. 2 is a flow chart of a method for controlling drum level display according to one embodiment of the present application;
fig. 3 is a schematic hardware structure of an electronic device for drum level control according to the present application.
Detailed Description
Specific embodiments of the present application will be further described below with reference to the accompanying drawings.
It is to be readily understood that, according to the technical solutions of the present application, those skilled in the art may replace various structural modes and implementation modes with each other without changing the true spirit of the present application. Accordingly, the following detailed description and drawings are merely illustrative of the application and are not intended to be exhaustive or to limit the application to the precise form disclosed.
Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.
As shown in FIG. 1, the drum level control system of the present application comprises a controller (not shown), a drum 11, a thermometer TI-111013, a drum steam flowmeter FT-111001, a pressure sensor PT-111005, a drum level meter LT-111002, a first chiller TLX1, a second chiller TLX2 and a feed water regulating valve FV, the thermometer TI-111013 is used for detecting real-time drum steam temperature, the drum steam flowmeter FT-111001 is used for detecting real-time drum steam flow, the pressure sensor PT-111005 is used for detecting real-time drum steam pressure, the drum level meter LT-111002 is used for detecting real-time drum level, the first chiller TLX1 and the second chiller TLX2 are used for reducing the temperature of the drum 11, and the feed water regulating valve FV is used for regulating feed water flow.
The controller may be a programmable logic controller (Programmable Logic Controller, PLC) or a separate chip with control capability, with the PLC being preferred. For ease of control, the controller includes a temperature controller TIC-111013, a drum steam flow controller FI-111001, a drum level controller LIC-111002, a feedwater steam flow controller FIC-111004, a pressure compensation calculation module FY-111001, a drum steam level calculator LY-111002, a first chiller feed water controller FIC-111009, and a second chiller feed water controller FIC-111010, the drum level controller LIC-111002 includes a first secondary level control module LIC-111002A, a second secondary level control module LIC-111002B, a third secondary level control module LIC-111002C, and a fourth secondary level control module LIC-111002D, the temperature controller TIC-111013 is used to control drum steam flow, the drum level controller LIC-111002 is used to control drum level, the feedwater steam flow controller FIC-111004 is used to control feedwater steam flow, the pressure compensation calculation module LIC-111001 is used to calculate a pressure compensator FC-11192 is used to calculate a first chiller feed water flow, and the pressure compensator FC-111002 is used to calculate a second chiller feed water flow, the first water flow controller FC-liquid level controller FC-11137 is used to calculate a second chiller feed water flow, and the first water flow controller FC-liquid level controller FX-liquid.
It should be noted that the number of the coolers can be set according to the requirements of users, and the number of the coolers is preferably two in the application.
As shown in fig. 2, fig. 2 is a flowchart of a control method for drum level display according to an embodiment of the present application, including:
step S201: acquiring state information of a steam drum;
step S202: correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam flow and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level;
step S203: determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow;
step S204: and controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow.
Specifically, during the temperature raising and lowering of the steam drum, first, the controller performs step S201 to obtain the state information of the steam drum, wherein the state information of the steam drum includes the real-time steam drum steam temperature, the real-time steam drum steam pressure, the real-time steam drum steam flow, the real-time steam drum liquid level and the real-time water supply inlet flow, and the state information of the steam drum is measured by the above-mentioned measuring meter and sensor and is transmitted to the controller; secondly, executing a step S202, wherein a pressure compensation calculation module FY-111001 calculates the real-time steam drum steam flow and the real-time steam drum steam pressure, and performs pressure compensation on the real-time steam drum steam flow to obtain a target steam drum steam flow; then, a drum liquid level calculator LY-111002 calculates a target drum steam flow and a target drum liquid level, and takes the calculated result as a water inlet flow set value; finally, the water inlet flow controller FIC-111004 takes the deviation of the water inlet flow set value and the real-time water inlet flow as the adjusting signal of the water inlet adjusting valve FV, thereby controlling the target water inlet flow, realizing automatic control of the drum liquid level and improving the accuracy of the drum liquid level control.
According to the control method for the steam drum liquid level display, the steam drum state information is obtained, the steam drum state information comprises the real-time steam drum steam temperature, the real-time steam drum steam pressure, the real-time steam drum liquid level and the real-time water supply inlet flow, the real-time steam drum steam flow and the real-time steam drum liquid level are corrected according to the real-time steam drum steam flow and the real-time steam drum steam pressure to obtain the target steam drum steam flow and the target steam drum liquid level, the water supply inlet flow is controlled according to the target steam drum liquid level and the preset steam drum liquid level, the target water supply inlet flow is controlled according to the water supply inlet flow set value and the real-time water supply inlet flow, and the display of the steam drum liquid level is controlled according to the target steam drum liquid level, the target steam drum steam flow and the target water supply inlet flow, so that the automatic control of the steam drum liquid level is realized, the accuracy of the steam drum liquid level control and the display is improved, and the stability and safety of a system are improved.
In one embodiment, correcting the real-time drum steam flow according to the real-time drum steam temperature and the real-time drum steam pressure to obtain the target drum steam flow includes:
the pressure compensation coefficient was calculated using the following:
wherein a is a pressure compensation coefficient; p (P) x Is the real-time drum steam pressure; p (P) 1 Is at atmospheric pressure; p (P) 0 Presetting steam pressure of a steam drum; t (T) 0 The temperature of the steam drum is preset; t (T) 1 Absolute temperature; t (T) x And correcting the real-time steam drum steam flow for the real-time steam drum steam temperature according to the pressure compensation coefficient to obtain the target steam drum steam flow.
Specifically, atmospheric pressure P 1 Preset drum steam pressure P 0 Preset drum temperature T 0 And absolute temperature T 1 The real-time drum steam temperature T is set according to the pressure working condition set by the boiler x The pressure compensation coefficient can be calculated by the formula (1) by measuring with a drum thermometer.
In one embodiment, correcting the real-time drum steam flow according to the pressure compensation coefficient to obtain the target drum steam flow includes:
the target drum steam flow is calculated using:
wherein q m The target drum steam flow; a is a pressure compensation coefficient; c is the outflow coefficient; beta is the aperture ratio of throttling; epsilon is the gas expansion coefficient; d is the aperture of the throttling element under the working condition; Δf is the pressure differential across the long diameter nozzle; ρ 1 The steam density is designed for working conditions; d is the upstream restrictor aperture under operating conditions.
Specifically, the outflow coefficient C, the throttle aperture ratio beta, the gas expansion coefficient epsilon, the throttle aperture D under the working condition, the front-rear pressure difference delta F of the long-diameter nozzle and the upstream throttle aperture D under the working condition are set according to the working condition set by the boiler, and the steam density rho is designed under the working condition 1 Setting according to pressure conditions set by the boiler, setting parameters of saturated steam temperature, density and pressure in generalAs shown in the following table 1, the parameters under different pressure working conditions are obtained according to a table look-up table when the system is used by presetting the parameters in the system in the form of the table 1, and then the target steam drum steam flow can be calculated according to the formula (2).
TABLE 1
According to the embodiment, the target drum steam flow is accurately calculated, so that the accuracy of drum liquid level control is improved.
In one embodiment, correcting the real-time drum level according to the real-time drum steam temperature and the real-time drum steam pressure to obtain the target drum level includes:
the varying drum level after the pressure variation was calculated using the following:
wherein V is Steam X The volume of the constant gas phase after the pressure change; h X To vary the drum level; v (V) Liquid and its preparation method Is the volume of liquid phase; c (C) L Specific heat of water in the steam drum; c (C) V Specific heat of steam in the steam drum; c (C) LX Specific heat of water in the steam drum; c (C) VX Specific heat of steam in the steam drum; v (V) Total (S) Is the total volume of the steam drum;
and correcting the real-time drum liquid level according to the difference value of the variable drum liquid level and the real-time drum liquid level to obtain the target drum liquid level.
Specifically, the liquid phase volume V Liquid and its preparation method Specific heat C of water in steam drum L And specific heat C of steam in drum V The total volume V of the drum is obtained by inquiring the above table 1 according to the real-time drum steam temperature and the real-time drum steam pressure Total (S) The sum of the volumes of the drum systems is the drumThe system volume typically includes drum tank volume, chiller volume, riser volume, and the like.
According to the principle of a double-chamber balance container, the real-time drum liquid level H can be calculated by using the following steps:
wherein ρ is a Is the density of the reference water column; ρ sx Is the density of saturated steam in the drum; ρ wx Is the density of saturated water in the drum; g is gravity.
Density ρ of reference water column a Density ρ of saturated steam in drum sx And density ρ of saturated water in the drum wx Can be obtained by looking up a table according to the table 1, and can calculate the changed drum liquid level H according to the formula (3) X According to the formula (4), the real-time drum liquid level H can be calculated, and the drum liquid level (H) X H) revising the liquid level of the steam drum into the liquid level indication of the steam drum, so as to calculate the fluctuation influence of the fluctuation amplitude of the pressure on the liquid level of the steam drum, thereby obtaining the target control liquid level of the steam drum, taking the interference value changed each time as the feedforward of three impulse adjustment, avoiding the problem that the liquid level of the steam drum greatly fluctuates after the compressor jumps and the PID adjustment cannot be solved, requiring the operation of personnel intervention, and reducing the probability of the interlocking of the cracking furnace when the steam drum jumps.
In one embodiment, determining a feed water flow set point according to a target drum liquid level and a preset drum liquid level, and controlling a target feed water flow according to the feed water flow set point and a real-time feed water flow, includes:
calculating a liquid level deviation value of the target drum liquid level and a preset drum liquid level, and setting the liquid level deviation value as a water inlet flow set value;
and calculating a set value of the inflow water flow and a flow deviation value of the inflow water flow of the real-time water supply, and controlling the inflow water flow of the target water supply according to the flow deviation value.
Specifically, the controller firstly calculates a liquid level deviation value of a target drum liquid level and a preset drum liquid level, sets the liquid level deviation value as a water inlet flow set value, then calculates the water inlet flow set value and a flow deviation value of the real-time water inlet flow, carries out PID algorithm processing on the flow deviation value, converts the flow deviation value into a valve opening value of the water inlet regulating valve FV, regulates the water inlet flow by controlling the valve opening of the water inlet regulating valve FV, and realizes the control of the target water inlet flow by accurately obtaining the water inlet flow set value, thereby further improving the accuracy of the drum liquid level control.
In one embodiment, the drum status information further includes at least one chiller outlet flow, the display of the drum level being controlled in accordance with the target drum level, the target drum steam flow, and the target feedwater inlet flow, comprising:
adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and the at least one quencher outlet flow to obtain a drum liquid level output value;
and controlling the display of the drum liquid level according to the drum liquid level output value.
According to the embodiment, the accuracy of the drum liquid level display of the drum during the temperature rising and falling period can be improved by accurately controlling the drum liquid level output.
In one embodiment, the drum status information further includes at least one chiller water inlet flow, the preset drum level includes a first preset drum level and a second preset drum level, the first preset drum level is greater than the second preset drum level,
adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and the at least one chiller inlet flow to obtain a drum liquid level output value, and further comprising:
when the water inlet flow of the quencher is greater than the first preset drum liquid level, taking the first preset drum liquid level as the water outlet flow of the quencher;
and when the water inlet flow rate of the quencher is smaller than the second preset drum liquid level, taking the second preset drum liquid level as the water outlet flow rate of the quencher.
Specifically, the preset drum level comprises a first preset drum level and a second preset drum level, the first preset drum level is the highest limit value of the preset drum level, the second preset drum level is the lowest limit value of the preset drum level, and the first preset drum level is greater than the second preset drum level. The controller compares the water inflow of the quencher with a first preset drum liquid level and a second preset drum liquid level respectively, and when the water inflow of the quencher is larger than the first preset drum liquid level, the first preset drum liquid level is used as the water outflow of the quencher; when the water inflow of the quencher is smaller than the second preset drum liquid level, the second preset drum liquid level is used as the water outflow of the quencher, so that the water inflow is controlled within a safe liquid level range by controlling the water inflow regulating valve FV after the high selection and the low selection of the drum liquid level and the water outflow of the quencher, and the cooling capacity of the quencher is met while the water inflow of the drum is ensured.
In one embodiment, controlling the display of the drum level in accordance with the target drum level, the target drum steam flow and the target feedwater inlet flow includes:
the drum level output value is calculated using:
0P＝IP1+((IP2-50)*FSBFW/100)-IP3
wherein OP is a drum liquid level output value; IP1 is the target drum steam flow; IP2 is the target drum level; FSBFW is the target water supply flow; IP3 is the water inflow of the quencher;
and controlling the display of the drum liquid level according to the drum liquid level output value.
According to the embodiment, the accuracy of the drum liquid level display of the drum during the temperature rising and falling period can be improved by accurately controlling the drum liquid level output.
Fig. 3 is a schematic hardware structure of an electronic device for controlling a drum liquid level according to the present application, including:
at least one processor 301; the method comprises the steps of,
a memory 302 communicatively coupled to the at least one processor 301; wherein,,
the memory 302 stores instructions executable by the at least one processor 301, the instructions being executable by the at least one processor 301 to enable the at least one processor 301 to perform:
acquiring steam drum state information, wherein the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum liquid level and real-time water supply inlet flow;
correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam temperature and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level; determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow;
and controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow.
One processor 301 is illustrated in fig. 3.
The electronic device is preferably a controller.
The electronic device may further include: an input device 303 and an output device 304.
The processor 301, memory 302, input device 303, and display device 304 may be connected by a bus or other means, for example.
The memory 302 is used as a non-volatile computer readable storage medium, and may be used to store a non-volatile software program, a non-volatile computer executable program, and modules, such as program instructions/modules corresponding to a method for controlling the drum level display in an embodiment of the present application, for example, a method flow shown in fig. 2. The processor 301 executes various functional applications and data processing by running nonvolatile software programs, instructions and modules stored in the memory 302, i.e., implements the control method of the drum level display in the above-described embodiment.
Memory 302 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the control method of the drum level display, etc. In addition, memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 302 may optionally include memory remotely located relative to processor 301, which may be connected via a network to a device performing the control method of the drum level display. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 303 may receive input user clicks and generate signal inputs related to user settings and function controls of the control method of the drum level display. The display 304 may include a display device such as a display screen.
The control method of drum level display in any of the method embodiments described above is performed when executed by the one or more processors 301, with the one or more modules stored in the memory 302.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present application.
The electronic device of the embodiments of the present application exists in a variety of forms including, but not limited to:
(1) The electronic control unit (Electronic Control Unit, ECU) is also called as a "traveling computer", "vehicle-mounted computer", etc. The device mainly comprises a microprocessor (CPU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D), and large-scale integrated circuits such as shaping and driving.
(2) Mobile communication devices, which are characterized by mobile communication functionality and are aimed at providing voice, data communication. Such terminals include smart phones (e.g., iPhone), multimedia phones, functional phones, and low-end phones, among others.
(3) Ultra mobile personal computer equipment, which belongs to the category of personal computers, has the functions of calculation and processing and generally has the characteristic of mobile internet surfing. Such terminals include PDA, MID, and UMPC devices, etc.
(4) Portable entertainment devices such devices can display and play multimedia content. Such devices include audio, video players (e.g., iPod), palm game consoles, electronic books, and smart toys and portable car navigation devices.
(5) The server is similar to a general computer architecture in that the server is provided with high-reliability services, and therefore, the server has high requirements on processing capacity, stability, reliability, safety, expandability, manageability and the like.
(6) Other electronic devices with data interaction function.
Further, the logic instructions in memory 302 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a mobile terminal (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the application. Those of ordinary skill in the art will understand and implement the present application without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the embodiments of the present application, and are not limited thereto; although embodiments of the present application have been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. A method of controlling a drum level display, comprising:
acquiring steam drum state information, wherein the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum steam flow, real-time steam drum liquid level and real-time water supply inlet flow;
correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam temperature and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level;
determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow;
controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow;
the drum status information further includes at least one chiller outlet flow, the controlling of the display of drum level based on the target drum level, the target drum steam flow, and the target feedwater inlet flow, comprising:
adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and at least one quencher outlet flow to obtain a drum liquid level output value;
controlling the display of the drum liquid level according to the drum liquid level output value;
the steam drum state information also comprises at least one chiller water inlet flow, the preset steam drum liquid level comprises a first preset steam drum liquid level and a second preset steam drum liquid level, the first preset steam drum liquid level is the highest limit value of the preset steam drum liquid level, the second preset steam drum liquid level is the lowest limit value of the preset steam drum liquid level, and the first preset steam drum liquid level is larger than the second preset steam drum liquid level;
the adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and at least one quencher outlet flow to obtain a drum liquid level output value, and the method further comprises the following steps:
when the water inlet flow rate of the quencher is greater than the first preset drum liquid level, taking the first preset drum liquid level as the water outlet flow rate of the quencher;
when the water inlet flow rate of the quencher is smaller than the second preset drum liquid level, taking the second preset drum liquid level as the water outlet flow rate of the quencher;
the water inlet regulating valve is controlled after the high selection and the low selection of the liquid level of the steam drum and the water inlet flow of the quencher are carried out.
2. The method for controlling drum level display as claimed in claim 1, wherein said correcting said real-time drum steam flow based on said real-time drum steam temperature and said real-time drum steam pressure to obtain a target drum steam flow comprises:
the pressure compensation coefficient was calculated using the following:
wherein a is the pressure compensation coefficient; p (P) x -providing said real-time drum steam pressure; p (P) 1 Is at atmospheric pressure; p (P) 0 Presetting steam pressure of a steam drum; t (T) 0 The temperature of the steam drum is preset; t (T) 1 Absolute temperature; t (T) x -providing said real-time drum steam temperature;
and correcting the real-time steam drum steam flow according to the pressure compensation coefficient to obtain the target steam drum steam flow.
3. The method for controlling drum level display according to claim 2, wherein said correcting said real-time drum steam flow according to said pressure compensation coefficient to obtain said target drum steam flow comprises:
calculating the target drum steam flow using:
wherein q m The target drum steam flow; a is the pressure compensation coefficient; c is the outflow coefficient; beta is the aperture ratio of throttling; epsilon is the gas expansion coefficient; d is the aperture of the throttling element under the working condition; Δf is the pressure differential across the long diameter nozzle; ρ 1 The steam density is designed for working conditions; d is the upstream restrictor aperture under operating conditions.
4. The method for controlling drum level display as claimed in claim 1, wherein said determining a feed water flow rate set point based on said target drum level and a preset drum level, and controlling a target feed water flow rate based on said feed water flow rate set point and said real-time feed water flow rate, comprises:
calculating a liquid level deviation value of the target drum liquid level and the preset drum liquid level, and setting the liquid level deviation value as the water inlet flow set value;
calculating the set value of the inflow water flow and the flow deviation value of the inflow water flow of the real-time water supply, and controlling the inflow water flow of the target water supply according to the flow deviation value.
5. The method of controlling drum level display as set forth in claim 1, wherein said controlling the display of drum level in accordance with said target drum level, said target drum steam flow and said target feedwater inlet flow comprises:
calculating the drum liquid level output value by using the following steps:
OP＝IP1+((IP2-50)*FSBFW/100)-IP3
wherein OP is the drum liquid level output value; IP1 is the target drum steam flow; IP2 is the target drum liquid level; FSBFW is the target water supply water inflow; IP3 is the water outlet flow of the quencher;
and controlling the display of the drum liquid level according to the drum liquid level output value.
6. A storage medium storing computer instructions which, when executed by a computer, are adapted to carry out all the steps of the method of controlling drum level display according to any one of claims 1-5.
7. An electronic device, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform:
acquiring steam drum state information, wherein the steam drum state information comprises real-time steam drum steam temperature, real-time steam drum steam pressure, real-time steam drum steam flow, real-time steam drum liquid level and real-time water supply inlet flow;
correcting the real-time steam drum steam flow and the real-time steam drum liquid level according to the real-time steam drum steam temperature and the real-time steam drum steam pressure to obtain a target steam drum steam flow and a target steam drum liquid level;
determining a water inlet flow set value according to the target drum liquid level and a preset drum liquid level, and controlling the target water inlet flow according to the water inlet flow set value and the real-time water inlet flow;
controlling the display of the drum liquid level according to the target drum liquid level, the target drum steam flow and the target feedwater inlet flow;
the drum status information further includes at least one chiller outlet flow, the controlling of the display of drum level based on the target drum level, the target drum steam flow, and the target feedwater inlet flow, comprising:
adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and at least one quencher outlet flow to obtain a drum liquid level output value;
controlling the display of the drum liquid level according to the drum liquid level output value;
the steam drum state information also comprises at least one chiller water inlet flow, the preset steam drum liquid level comprises a first preset steam drum liquid level and a second preset steam drum liquid level, the first preset steam drum liquid level is the highest limit value of the preset steam drum liquid level, the second preset steam drum liquid level is the lowest limit value of the preset steam drum liquid level, and the first preset steam drum liquid level is larger than the second preset steam drum liquid level;
the adding the target drum liquid level, the target drum steam flow, the target feedwater inlet flow and at least one quencher outlet flow to obtain a drum liquid level output value, and the method further comprises the following steps:
when the water inlet flow rate of the quencher is greater than the first preset drum liquid level, taking the first preset drum liquid level as the water outlet flow rate of the quencher;
when the water inlet flow rate of the quencher is smaller than the second preset drum liquid level, taking the second preset drum liquid level as the water outlet flow rate of the quencher;
the water inlet regulating valve is controlled after the high selection and the low selection of the liquid level of the steam drum and the water inlet flow of the quencher are carried out.
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| CN113566188A (en) * | 2021-07-30 | 2021-10-29 | 中国恩菲工程技术有限公司 | Boiler drum liquid level three-impulse control method, system, equipment and storage medium |
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