CN113109041A - Calibration mode improvement method for thermal power plant steam turbine side low-point drainage actuating mechanism - Google Patents
Calibration mode improvement method for thermal power plant steam turbine side low-point drainage actuating mechanism Download PDFInfo
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- CN113109041A CN113109041A CN202110371702.0A CN202110371702A CN113109041A CN 113109041 A CN113109041 A CN 113109041A CN 202110371702 A CN202110371702 A CN 202110371702A CN 113109041 A CN113109041 A CN 113109041A
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Abstract
The invention discloses a method for improving a check mode of a steam-engine side low-point drainage actuating mechanism of a thermal power plant, which comprises the steps of selecting valves to carry out logic modification according to the actual conditions of field valves, and checking and grouping the selected valves; carrying out phase and phase or operation on the manual setting switch module and an automatic opening signal or an automatic closing signal of the valve respectively to obtain a remote control instruction of the valve; the valve is remotely opened or closed through a remote control instruction; according to the invention, through the addition of the low-point hydrophobic two-position gate forcing logic block, the verification items of the two-position gate can be executed during the overhaul or the mediation of the unit, so that the defects of the equipment can be found in time, and compared with the over forcing function, the operation safety and accuracy are ensured, and the possibility of operation misoperation is avoided.
Description
Technical Field
The invention relates to the technical field, in particular to a method for improving a calibration mode of a low-point drainage actuating mechanism at the side of an steam engine of a thermal power plant.
Background
At present, thermal power generating units are still in the dominant position in the domestic power grid structure, so that the low-point drainage control valve commonly used on the steam turbine side in the unit plant of the first period of China also plays a very important role. The actuating mechanisms are generally two-position adjusting doors, and in the normal operation process, the actuating mechanisms are automatically opened and closed according to different requirements under the conditions of steam turbine operation and other related conditions. However, in the process of maintenance, such conditions are not met, and about 30 two-position door adjusting units are arranged. Each time of maintenance needs to check the two-position adjusting door, and the logic used by our factory for the first time is ABB composition 5.0, and a mandatory means cannot be adopted for a certain logic block.
In actual operation, the two-position actuator depends on the action condition of the low-point drainage water level switch in addition to different conditions such as the state of a unit, the main steam pressure, the state of an auxiliary machine and the like. The valve is opened when the machine is shut down due to the requirement of original logic instructions during maintenance, and the valve is opened by reporting high liquid level after the contact of the water level switch is conducted, so that the fault reason of the valve on site cannot be well judged during the shutdown of the machine set.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a method for improving the calibration mode of the steam-engine side low-point drainage actuating mechanism of the thermal power plant, which can avoid the fault condition of misjudgment of the valve caused by the misoperation of a water level switch.
In order to solve the technical problems, the invention provides the following technical scheme: selecting valves to carry out logic modification according to the actual conditions of the on-site valves, and checking and grouping the selected valves; carrying out phase and phase or operation on the manual setting switch module and an automatic opening signal or an automatic closing signal of the valve respectively to obtain a remote control instruction of the valve; and carrying out remote opening or closing operation on the valve through the remote control command.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: the actual conditions of the on-site valve comprise the service condition of the valve, the service life of the valve and whether the valve is controlled by the electromagnetic valve instruction.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: the logic modification comprises the steps of comparing a unit tripping signal, a valve water level switch action signal with the manual setting switch module, and setting the working state of the manual setting switch module to be 1; and (3) connecting a valve automatic closing signal with the manual setting switch module, and setting the working state of the manual setting switch module to be 0.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: the checking includes, a switch action check: when the valve acts, whether the sent instruction is consistent with the local valve action condition is checked, and the contact condition of valve limit and the jamming condition of the valve are checked; checking the circuit grounding: when the valve is automatically opened or closed, whether the valve can correctly send the instruction is checked.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: the grouping result comprises a starting drain valve group, a heater drain valve group and an extraction drain valve group.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: the remote control instruction comprises an automatic opening instruction and an automatic closing instruction; and remotely opening the valve through the automatic opening instruction, and remotely closing the valve through the automatic closing instruction.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: the method also comprises the step that when the unit load reaches 100MW, the valve triggers the automatic closing signal, and then the valve receives an automatic closing command of the actuating mechanism.
As a preferable scheme of the method for improving the check mode of the steam-engine-side low-point hydrophobic actuator of the thermal power plant, the method comprises the following steps: and setting a water level threshold, and after the contact of the water level switch of the valve is switched on, if the water level is higher than the water level threshold, sending the automatic closing instruction through a DCS (distributed control system) to close the valve.
The invention has the beneficial effects that: according to the invention, through the addition of the low-point hydrophobic two-position gate forcing logic block, the verification items of the two-position gate can be executed during the overhaul or the mediation of the unit, so that the defects of the equipment can be found in time, and compared with the over forcing function, the operation safety and accuracy are ensured, and the possibility of operation misoperation is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic flow chart of a method for improving a calibration mode of a steam-side low-point hydrophobic actuator of a thermal power plant according to a first embodiment of the present invention;
FIG. 2 is a schematic logic diagram illustrating a method for improving a calibration mode of a steam-side low-point hydrophobic actuator of a thermal power plant according to a first embodiment of the present invention;
fig. 3 is a comparison diagram illustrating the control valve results of a method for improving the check mode of the steam-turbine-side low-point hydrophobic actuator according to the second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, a first embodiment of the present invention provides a method for improving a calibration mode of a steam-side low-point hydrophobic actuator of a thermal power plant, including:
s1: and selecting valves to carry out logic modification according to the actual conditions of the valves on site, and inspecting and grouping the selected valves.
The actual conditions of the on-site valve include the service condition of the valve, the service life of the valve, whether the valve is controlled by a solenoid valve command or not, and the like.
Preferentially selecting the valve according to the conditions, and then logically modifying the selected valve, wherein the specific steps are as follows:
(1) comparing a unit trip signal, a valve water level switch action signal and the manual setting switch module 100, and setting the working state of the manual setting switch module 100 as 1;
(2) the valve automatic closing signal is compared with the manual setting switch module 100, and the state of the manual setting switch module 100 during operation is set to 0.
It should be noted that the manual setting switch module 100 is one of logic algorithm modules built in the ABB, and its function is to provide an adjustable 0 or 1 output for user selection.
Further, the valve after logic modification is checked, and the check comprises a switch action check and a circuit grounding check.
(1) Checking the switching action: when the valve acts, whether the sent instruction is consistent with the local valve action condition is checked, and the contact condition of the valve limit and the jamming condition of the valve are checked; the command here is a valve operation command (a valve opening command and a valve closing command).
(2) Checking the circuit grounding: when the valve is automatically opened or closed, the valve is checked to correctly send out command.
The two-position adjusting valve is mainly used for transforming a field two-position adjusting valve, and the state of the valve is determined by controlling air inlet and air outlet of an air source from the air source to an electromagnetic valve; because the working states of different hydrophobic doors can change or be different along with the change of the unit state, different hydrophobic doors need to be grouped into the following three groups: starting a drain valve group, a heater drain valve group and a steam extraction drain valve group.
S2: and (3) carrying out phase and phase or operation on the manual setting switch module 100 and an automatic opening signal or an automatic closing signal of the valve respectively to obtain a remote control instruction of the valve.
The remote control command comprises an automatic opening command and an automatic closing command; referring to fig. 2, the manual setting switch module 100 is connected with a unit trip signal or a valve water level switch action to obtain an automatic opening instruction; when the load of the unit reaches 100MW, the valve triggers an automatic closing signal, and the manual setting switch module 100 is compared with the automatic closing signal to obtain an automatic closing instruction.
For the heater drain valve group, a water level threshold value is set to be 300mm, and after a valve water level switch contact is conducted, if the water level is higher than the water level threshold value, an automatic closing instruction is sent through a Distributed Control System (DCS) to close the valve.
S3: and the valve is remotely opened or closed through a remote control command.
The valve is remotely opened through an automatic opening instruction, and the valve is remotely closed through an automatic closing instruction.
Preferably, the automatic on signal/automatic off signal phase or phase corresponding to the valve of the dynamic setting switch module 100 is or phase, so that the valve can be remotely controlled under some special conditions without affecting the automatic control.
Example 2
In order to verify and explain the technical effects adopted in the method, the embodiment selects the traditional technical scheme and adopts the method to perform comparison test, and compares the test results by means of scientific demonstration to verify the real effect of the method.
The traditional technical scheme can not adopt a forced means for a certain logic block, and can not well judge the fault reason of the field valve during the shutdown of the unit.
In order to verify that the method can realize the manual forced valve opening or closing operation in logic compared with the traditional technical scheme, the verification item of the two-position adjusting valve can be executed during the overhaul or the mediation of the unit, and the method has higher safety; in this embodiment, the actions of the valve are respectively judged and compared in real time by using the conventional technical scheme and the method.
The traditional technical scheme and the method are respectively adopted to control the action of the valves with the same quantity, 11 experiments are carried out, and the quantity of the valves controlled each time is shown in the following table.
Table 1: the number of valves controlled in each experiment.
The control result is shown in fig. 3, and it can be seen from the figure that the average accuracy of the method for operating the valve is more than 90%, which is obviously superior to the traditional technical scheme.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A method for improving a calibration mode of a steam-electric plant steam-turbine side low-point drainage actuating mechanism is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
selecting valves to carry out logic modification according to the actual conditions of the on-site valves, and checking and grouping the selected valves;
carrying out phase and/or phase or operation on the manual setting switch module (100) and an automatic opening signal or an automatic closing signal of the valve respectively to obtain a remote control instruction of the valve;
and carrying out remote opening or closing operation on the valve through the remote control command.
2. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator as claimed in claim 1, wherein: the practical circumstances of the on-site valve include,
the service condition of the valve, the service life of the valve and whether the valve is controlled by the electromagnetic valve instruction.
3. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator according to claim 1 or 2, characterized in that: the logical modification includes the modification of the logic including,
comparing a unit tripping signal and a valve water level switch action signal with the manual setting switch module (100), and setting the working state of the manual setting module as 1;
and (3) carrying out phase connection between a valve automatic closing signal and the manual setting switch module (100), and setting the working state of the manual setting switch module (100) to be 0.
4. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator as claimed in claim 3, wherein: the checking includes the steps of checking the position of the object,
checking the switching action: when the valve acts, whether the sent instruction is consistent with the local valve action condition is checked, and the contact condition of valve limit and the jamming condition of the valve are checked;
checking the circuit grounding: when the valve is automatically opened or closed, whether the valve can correctly send the instruction is checked.
5. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator according to claim 1 or 2, characterized in that: the grouping result includes the grouping result including,
starting a drain valve group, a heater drain valve group and a steam extraction drain valve group.
6. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator as claimed in claim 5, wherein: the remote control instruction comprises an automatic opening instruction and an automatic closing instruction;
and remotely opening the valve through the automatic opening instruction, and remotely closing the valve through the automatic closing instruction.
7. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator according to any one of claims 1, 4 and 6, characterized in that: also comprises the following steps of (1) preparing,
and when the unit load reaches 100MW, the valve triggers the automatic closing signal, and then the valve receives an automatic closing instruction of the actuating mechanism.
8. The method for improving the check mode of the steam-electric-power-plant-side low-point hydrophobic actuator as claimed in claim 1, wherein: also comprises the following steps of (1) preparing,
and setting a water level threshold, and after the contact of the water level switch of the valve is switched on, if the water level is higher than the water level threshold, sending the automatic closing instruction through the distributed control system to close the valve.
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| CN202110371702.0A CN113109041B (en) | 2021-04-07 | 2021-04-07 | Verification mode improvement method for steam turbine side low-point drainage executing mechanism of thermal power plant |
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| CN202110371702.0A CN113109041B (en) | 2021-04-07 | 2021-04-07 | Verification mode improvement method for steam turbine side low-point drainage executing mechanism of thermal power plant |
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