CN217304035U - Main feed water flow measuring device of steam generator under low load of nuclear power generation unit - Google Patents
Main feed water flow measuring device of steam generator under low load of nuclear power generation unit Download PDFInfo
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- CN217304035U CN217304035U CN202220536136.4U CN202220536136U CN217304035U CN 217304035 U CN217304035 U CN 217304035U CN 202220536136 U CN202220536136 U CN 202220536136U CN 217304035 U CN217304035 U CN 217304035U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The utility model provides a steam generator main water supply flow measuring device under the second generation unit low load of nuclear power, including main water supply pipe, orifice plate, first differential pressure transmitter, second differential pressure transmitter and host computer, the orifice plate sets up in the low reaches of main water supply pipe; the first differential pressure transmitter and the second differential pressure transmitter are connected with two ends of the pore plate and used for detecting differential pressure signals on two sides of the pore plate and sending the differential pressure signals to an upper computer; the upper computer is used for obtaining a water flow signal of the main water supply pipeline according to the differential pressure signal; the first differential pressure transmitter and the second differential pressure transmitter are different transmitters with different types. Through the utility model discloses, can solve under the low-load steam generator main feed water flow meter and show virtual high problem.
Description
Technical Field
The utility model relates to a nuclear power technical field, concretely relates to steam generator owner's feedwater flow measuring device under second generation of nuclear power unit low-load.
Background
The M310/CPR1000/CNP650 pressurized water reactor nuclear power unit, the water level adjustment of the steam generator (hereinafter referred to as SG) is completed by controlling the flow of feedwater into the steam generator. The normal water supply loop of each steam generator is provided with two parallel pipelines: the main water supply regulating valve (big valve) on the main pipeline is used for water level regulation under the high-load operation working condition, and the bypass regulating valve on the bypass pipeline is used for the operation working condition of low-load and start-stop stages; wherein the water level control is a cascade PID control.
The problem of the display of the SG main water supply flow meter is high under low load, and various maintenance strategies are adopted in multi-base years without any improvement. Due to the feedforward action, the main water supply large valve is closed under the automatic condition, the liquid level of a steam generator is reduced, shutdown and shutdown can be caused in severe cases, and serious hidden danger is brought to safe and stable operation of a unit.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a start physical test special signal connector to solve steam generator owner feed water flow meter under the low-load and show the virtual high problem.
In order to achieve the purpose, the embodiment of the utility model provides a steam generator main feed water flow measuring device under the second generation of nuclear power unit low load, including main feed water pipe, orifice plate, first differential pressure transmitter, second differential pressure transmitter and host computer, the orifice plate sets up in main feed water pipe's low reaches; the first differential pressure transmitter and the second differential pressure transmitter are connected with two ends of the pore plate and used for detecting differential pressure signals on two sides of the pore plate and sending the differential pressure signals to an upper computer; and the upper computer is used for obtaining a water flow signal of the main water supply pipeline according to the differential pressure signal.
Preferably, the system further comprises an instrument switching device, wherein the instrument switching device comprises a quality bit fault judgment module, a water flow judgment module, a nuclear power judgment module, a manual switching button module, an OR circuit, an RS trigger, a first AND circuit, a second AND circuit, a third AND circuit and a switch;
the output of the quality bit fault judgment module is input into the first AND circuit after being negated, and the outputs of the water flow judgment module and the nuclear power judgment module are input into the first AND circuit;
the manual switching button comprises a button for switching in a second differential pressure transmitter and a button for switching out the second differential pressure transmitter, the output of the button for switching in the second differential pressure transmitter is input into the second AND circuit, and the output of the first AND circuit is input into the second AND circuit;
the output of the button of the second differential pressure transmitter is input into the OR circuit, and the output of the first AND circuit is input into the OR circuit after being negated;
the output of the OR circuit is input into the RS trigger, and the output of the second AND circuit is input into the RS trigger;
the output of the first AND circuit is input into the third AND circuit, and the output of the RS trigger is input into the third AND circuit;
the output of the third AND circuit is input into the change-over switch;
the change-over switch is used for receiving a first water flow signal of a main water supply pipeline corresponding to a differential pressure signal detected by the first differential pressure transmission transformer and a second water flow signal of the main water supply pipeline corresponding to a differential pressure signal detected by the second differential pressure transmitter, which are transmitted by the upper computer, switching according to the output of the third and circuit, and transmitting the first water flow signal or the second water flow signal to the water level adjusting unit.
Preferably, if the output of the third and circuit is 1, the second water flow signal is sent to a water level adjusting unit; and if the output of the third AND circuit is 0, the first water flow signal is sent to the water level adjusting unit.
Preferably, the quality bit fault judgment module is configured to receive a fault signal issued by the upper computer, judge whether the second differential pressure transmitter has a fault according to the fault signal, output a 1 if the second differential pressure transmitter has a fault, and output a 0 if the second differential pressure transmitter is normal.
Preferably, the water flow judging module is configured to receive a water flow signal sent by the upper computer, judge whether the water flow of the main water supply pipeline is greater than 150t/h and less than 550t/h according to the water flow signal, output 1 if yes, and output 0 if no.
Preferably, the nuclear power judgment module is configured to receive a nuclear power signal of the nuclear power plant issued by the upper computer, judge whether the nuclear power is less than 30% according to the nuclear power signal, output 1 if yes, and output 0 if no.
Preferably, the outputs of the button for inputting the second differential pressure transmitter and the button for cutting out the second differential pressure transmitter are pulse commands, and when the button for inputting the second differential pressure transmitter and the button for cutting out the second differential pressure transmitter are pressed, the corresponding pulse commands are triggered and maintained for 2 seconds and disappear.
The utility model has the advantages of it is following:
the utility model discloses set up orifice plate, first differential pressure transmitter, second differential pressure transmitter in steam generator's main water supply line's low reaches, utilize first differential pressure transmitter and second differential pressure transmitter to be used for detecting the differential pressure signal of orifice plate both sides, and send the differential pressure signal to the host computer; the upper computer can obtain a water flow signal corresponding to the main water supply pipeline according to the differential pressure signal; the utility model discloses taken and got the pressure from low reaches orifice plate, avoided the influence of the interior two-phase flow of venturi to the changer measurement among the conventional measurement scheme, guaranteed the normal control of low-load principal water supply virtual height to the evaporimeter water level.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a primary feed water flow measuring device of a steam generator under low load of a second generation nuclear power unit in an embodiment of the present invention.
Fig. 2 is a circuit structure diagram of the instrument switching device in the embodiment of the present invention.
Fig. 3 is a schematic view of an arrangement scheme of an on-site water supply flow measuring device in an embodiment of the present invention.
Fig. 4 is a schematic diagram of water level adjustment in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, an embodiment of the utility model provides a steam generator main feed water flow measuring device under second generation of nuclear power unit low load, including main feed water pipeline, orifice plate, first differential pressure transmitter, second differential pressure transmitter and host computer, the orifice plate sets up in main feed water pipeline's low reaches; the first differential pressure transmitter and the second differential pressure transmitter are connected with two ends of the pore plate and used for detecting differential pressure signals on two sides of the pore plate and sending the differential pressure signals to an upper computer; and the upper computer is used for obtaining a water flow signal of the main water supply pipeline according to the differential pressure signal.
Specifically, the first differential pressure transmitter and the second differential pressure transmitter are backup to each other, and a difference signal of the first differential pressure transmitter is used as a measurement result by default under a low load.
Further, referring to fig. 2, an embodiment of the present invention may further include an instrument switching device, where the instrument switching device includes a quality level fault determination module, a water flow determination module, a nuclear power determination module, a manual switching button module, an or circuit, an RS trigger, a first and circuit, a second and circuit, a third and circuit, and a switch;
the output of the quality bit fault judgment module is input into the first AND circuit after being negated, and the outputs of the water flow judgment module and the nuclear power judgment module are input into the first AND circuit;
the manual switching button comprises a button for switching in a second differential pressure transmitter and a button for switching out the second differential pressure transmitter, the output of the button for switching in the second differential pressure transmitter is input into the second AND circuit, and the output of the first AND circuit is input into the second AND circuit;
the output of the button of the second differential pressure transmitter is input into the OR circuit, and the output of the first AND circuit is input into the OR circuit after being negated;
the output of the OR circuit is input into the RS trigger, and the output of the second AND circuit is input into the RS trigger;
the output of the first AND circuit is input into the third AND circuit, and the output of the RS trigger is input into the third AND circuit;
the output of the third AND circuit is input into the change-over switch;
the change-over switch is used for receiving a first water flow signal of a main water supply pipeline corresponding to a differential pressure signal detected by the first differential pressure transmission transformer and a second water flow signal of the main water supply pipeline corresponding to a differential pressure signal detected by the second differential pressure transmitter, which are transmitted by the upper computer, switching according to the output of the third and circuit, and transmitting the first water flow signal or the second water flow signal to the water level adjusting unit so that the water level adjusting unit can adjust the water level according to the first water flow signal or the second water flow signal.
It should be noted that the quality level fault determination module, the water flow determination module, and the nuclear power determination module in fig. 2 are switching condition determination modules, and are configured to determine whether a switching condition is met, that is, to switch from the first differential transformer to the second differential transformer; in addition, the manual switching button and the switching condition judgment module do not necessarily appear in one scheme at the same time, and the embodiment preferably integrates the 2 modules, and actually can also be realized in a manual judgment mode.
Specifically, if the output of the third and circuit is 1, the second water flow signal is sent to a water level adjusting unit; and if the output of the third AND circuit is 0, the first water flow signal is sent to the water level adjusting unit.
Further, the quality bit fault judgment module is used for receiving a fault signal issued by the upper computer, judging whether the second differential pressure transmitter is in fault according to the fault signal, if so, outputting 1, and if normal, outputting 0;
further, the water flow judging module is used for receiving a water flow signal sent by the upper computer, judging whether the water flow of the main water supply pipeline is larger than 150t/h and smaller than 550t/h or not according to the water flow signal, if so, outputting 1, and if not, outputting 0.
Further, the nuclear power judgment module is configured to receive a nuclear power signal of the nuclear power plant issued by the upper computer, judge whether the nuclear power is less than 30% according to the nuclear power signal, output 1 if the nuclear power is less than 30%, and output 0 if the nuclear power is not less than 30%.
It should be noted that the upper computer can be understood as a monitoring device of the nuclear power plant, and can be used for status information of various instruments of the nuclear power plant, including fault signals of the instruments and nuclear power signals of the nuclear power plant.
Further, the outputs of the push button for inputting the second differential pressure transmitter and the push button for cutting out the second differential pressure transmitter are pulse commands, and when the push button for inputting the second differential pressure transmitter and the push button for cutting out the second differential pressure transmitter are pressed, the corresponding pulse commands are triggered and maintained for 2 seconds and disappear.
The utility model discloses set up orifice plate, first differential pressure transmitter, second differential pressure transmitter in steam generator's main water supply line's low reaches, utilize first differential pressure transmitter and second differential pressure transmitter to be used for detecting the differential pressure signal of orifice plate both sides, and send the differential pressure signal to the host computer; the upper computer can obtain a water flow signal corresponding to the main water supply pipeline according to the differential pressure signal; the utility model discloses taken and got the pressure from low reaches orifice plate, avoided the influence of the interior two-phase flow of venturi to the changer measurement among the conventional measurement scheme, guaranteed the normal control of low-load principal water supply virtual height to the evaporimeter water level.
The contents of the embodiments of the present invention are explained in an expanded manner so that the related contents and features of the present invention can be understood more easily:
as shown in fig. 3, the venturi tube in fig. 3 connects differential pressure signals to three transmitters, two wide-range transmitters and one narrow-range transmitter, and a hole plate is arranged at the downstream of the venturi tube, and one or two differential pressure transmitters (i.e. the first differential pressure transmitter and the second differential pressure transmitter) are mounted on the hole plate and are sent to an upper computer after measurement.
The Venturi flowmeter and the orifice plate flowmeter belong to standard throttling devices, namely, a Venturi tube or an orifice plate is arranged in a pipeline filled with liquid, and the local speed and pressure in a flow channel are forcibly changed, so that pressure drop is generated before and after a throttling element, the larger the flow rate of a medium flows, the larger the pressure difference generated before and after the throttling element is, and the flow rate of the pipeline can be indirectly obtained by measuring the pressure difference.
Venturi tube flow measurement principle: based on bernoulli's equation (law of conservation of energy) and continuity equation (law of conservation of mass): the kinetic energy + gravitational potential energy + pressure potential energy of any point in the fluid are constant. The formula and schematic diagram are as follows, where ρ is the fluid density, v is the fluid velocity, p is the pressure at a certain point in the fluid, const represents a constant.
Orifice plate flow measurement principle: according to the relevant regulations of international standard ISO5167(2003 edition), the fluid pressure difference and the fluid density of the orifice plate are measured, and the water supply flow is calculated according to the density and the pressure difference.
C-outflow coefficient;
e-progressive speed coefficient;
expansion factor of epsilon-flow
Fig. 4 shows the working principle of the water level adjusting unit, referring to fig. 4, the water level adjustment of the steam generator is performed by controlling the water supply flow (i.e. the first water flow signal or the second water flow signal) entering the steam generator, and the normal water supply loop of each steam generator is provided with two parallel pipelines with different pipe diameters: the main water supply regulating valve (big valve) on the main pipeline is used for water level regulation under the high-load operation working condition, and the bypass regulating valve on the bypass pipeline is used for the operation working condition of low-load and start-stop stages. The water level control is a cascade PID control.
When the unit is in a high-load (20% FP) operation working condition, the main water supply regulating valve takes on the regulating function of the water level of the steam generator, and the bypass regulating valve is in a full-open state. The main water supply regulating valve is regulated by a three-impulse (steam generator liquid level, steam flow and feed water flow) regulating circuit, and comprises a closed loop regulating circuit and an open loop regulating circuit. The signal is summed with the output signal of the level regulator in an adder and then sent to the flow regulator. In the closed loop regulating circuit, a feed water flow signal generated by a water level regulator is superposed with a steam-water mismatching signal generated by an open loop channel to be used as an input signal of the flow regulator, then a corresponding opening signal of a main feed water regulating valve is output, a corresponding valve opening analog signal is generated by a manual automatic controller to control the opening of the main feed water regulating valve, and therefore the feed water flow is changed to control the water level of steam generation.
When the load of the unit is less than 20.5% Pn, the main water supply regulating valve is fully closed, the liquid level of the steam generator is controlled by an ARE bypass regulating valve, and the double-impulse control is adopted. At this time, the big and small valve switching control module 420XU1 in the main feedwater regulating control loop is in a trigger state, the main/bypass regulating valve switch is closed, and 401MS is introduced, so that a steam flow of 8.5% Qn is assumed, and the main feedwater regulating valve is in a closed state. The difference between the measured value and the setting value of the evaporator water level is corrected by the variable gain coefficient of the feed water temperature, and the PID adjustment of the feed water level is carried out; and simultaneously, introducing the total steam flow as a feedforward signal to be sent to a feed water flow regulator to control a bypass feed water valve.
The fault signal comprises a card fault, a network fault, a signal short circuit, a signal open circuit, a signal over-range, a signal power failure and the like. If the water supply flow is less than 150t/h or more than 550 and the nuclear power is more than 30%, the switching condition is not met, the control is automatically switched to the first differential pressure transmitter, namely the switching switch is used for switching the control, otherwise, the switching condition is met, and the control is automatically switched to ARE005 MD; in the formal configuration, Q is more than or equal to 150 and less than or equal to 550t/h, a return difference of 20t/h is designed, and logic is prevented from switching back and forth at a critical constant value. The manual switching button is a pulse instruction, after the manual switching button is triggered, the pulse instruction is triggered and kept for 2s and disappears, and a long signal is fed back to be displayed as a 104KC icon to remind an operator.
Specifically, the meter switching device in the present embodiment satisfies the following logic:
1) the switching condition is met, the newly added instrument is normal, and the control of the newly added instrument ARE005MD can be manually switched;
2) when the switching condition is met but the newly added instrument fails, the original instrument ARE043/046MD control is automatically switched back;
3) when the newly added instrument is recovered from the fault, the automatic switching to the ARE005MD is not allowed even if the switching condition is satisfied;
4) when unexpected fluctuation of the newly added meter occurs, the operator judges whether to switch to ARE043/046MD control (manual switching can be realized).
It should be noted that the main idea of the present invention is to detect the differential pressure signal, and to obtain the corresponding water flow signal according to the differential pressure signal, which is the common knowledge known to those skilled in the art, and therefore it is not described any more, and the adjusting method of the water flow does not belong to the technical contents of the present invention, and the present embodiment aims to provide an accurate water flow signal to the water level adjusting unit, so as to perform the accurate control.
The utility model has the advantages of it is following: the problem is the common problem of multiple bases in China, and multiple bases adopt various maintenance strategies all the year round without any improvement. In this problem processing, the tradition is from improving venturi preceding fluid flow state, guarantee that the fluid stability is starting, however in fact because equipment causes the fluid characteristic to change the difference less on the pipeline, go to the modeling demonstration degree of difficulty from the front very big, if the modeling demonstrates successfully, need change the fluid characteristic, the processing method is with venturi migration backward in the past, increase venturi preceding straight tube section effective length, or with the bypass to main road T type connect change into the arc connection, but follow-up implementation degree of difficulty and design evaluation degree of difficulty are all very big, the expense is also high, and the utility model discloses an implement, implement the degree of difficulty and compare the many that need be little, the expense is compared normal processing and almost can be ignored, nevertheless has very big effect to the steady operation of unit. The utility model discloses taken and got the pressure from low reaches orifice plate, avoided venturi in the two-phase flow to the measured influence of changer, guaranteed the normal control of low-load main water supply virtual height to the evaporimeter water level.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial, or industrial. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (7)
1. A primary water supply flow measuring device of a steam generator of a nuclear power secondary unit under low load is characterized by comprising a primary water supply pipeline, a pore plate, a first differential pressure transmitter, a second differential pressure transmitter and an upper computer, wherein the pore plate is arranged at the downstream of the primary water supply pipeline; the first differential pressure transmitter and the second differential pressure transmitter are connected with two ends of the pore plate and used for detecting differential pressure signals on two sides of the pore plate and sending the differential pressure signals to an upper computer; the upper computer is used for obtaining a water flow signal of the main water supply pipeline according to the differential pressure signal; the first differential pressure transmitter and the second differential pressure transmitter are different transmitters with different types.
2. The measuring device according to claim 1, further comprising a meter switching device, wherein the meter switching device comprises a quality level fault judgment module, a water flow judgment module, a nuclear power judgment module, a manual switching button module, an OR circuit, an RS trigger, a first AND circuit, a second AND circuit, a third AND circuit and a switch;
the output of the quality bit fault judgment module is input into the first AND circuit after being negated, and the outputs of the water flow judgment module and the nuclear power judgment module are input into the first AND circuit;
the manual switching button comprises a button for switching in a second differential pressure transmitter and a button for switching out the second differential pressure transmitter, the output of the button for switching in the second differential pressure transmitter is input into the second AND circuit, and the output of the first AND circuit is input into the second AND circuit;
the output of the button of the second differential pressure transmitter is input into the OR circuit, and the output of the first AND circuit is input into the OR circuit after being negated;
the output of the OR circuit is input into the RS trigger, and the output of the second AND circuit is input into the RS trigger;
the output of the first AND circuit is input into the third AND circuit, and the output of the RS trigger is input into the third AND circuit;
the output of the third AND circuit is input into the change-over switch;
the change-over switch is used for receiving a first water flow signal of a main water supply pipeline corresponding to a differential pressure signal detected by the first differential pressure transmission transformer and a second water flow signal of the main water supply pipeline corresponding to a differential pressure signal detected by the second differential pressure transmitter, which are transmitted by the upper computer, switching according to the output of the third and circuit, and transmitting the first water flow signal or the second water flow signal to the water level adjusting unit.
3. The measuring device of claim 2, wherein if the output of the third and circuit is 1, the second water flow signal is sent to a water level adjustment unit; and if the output of the third AND circuit is 0, the first water flow signal is sent to the water level adjusting unit.
4. The measuring device of claim 3, wherein the quality level fault determining module is configured to receive a fault signal sent by the upper computer, determine whether the second differential pressure transmitter has a fault according to the fault signal, output a 1 if the second differential pressure transmitter has a fault, and output a 0 if the second differential pressure transmitter has a normal fault.
5. The measuring device according to claim 4, wherein the water flow judging module is configured to receive a water flow signal sent by the upper computer, judge whether the water flow of the main water supply pipeline is greater than 150t/h and less than 550t/h according to the water flow signal, output 1 if yes, and output 0 if no.
6. The measurement device according to claim 5, wherein the nuclear power judgment module is configured to receive a nuclear power signal of the nuclear power plant issued by the upper computer, judge whether a nuclear power is less than 30% according to the nuclear power signal, output 1 if yes, and output 0 if no.
7. The measuring apparatus according to claim 4, wherein outputs of the push button for inputting the second differential pressure transmitter and the push button for cutting out the second differential pressure transmitter are pulse commands, and when the push button for inputting the second differential pressure transmitter and the push button for cutting out the second differential pressure transmitter are pressed, the corresponding pulse commands are triggered and maintained for 2 seconds and disappear.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220536136.4U CN217304035U (en) | 2022-03-11 | 2022-03-11 | Main feed water flow measuring device of steam generator under low load of nuclear power generation unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220536136.4U CN217304035U (en) | 2022-03-11 | 2022-03-11 | Main feed water flow measuring device of steam generator under low load of nuclear power generation unit |
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| CN217304035U true CN217304035U (en) | 2022-08-26 |
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| CN202220536136.4U Active CN217304035U (en) | 2022-03-11 | 2022-03-11 | Main feed water flow measuring device of steam generator under low load of nuclear power generation unit |
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