CN114321872B - Boiler protection method and boiler protection device - Google Patents
Boiler protection method and boiler protection device Download PDFInfo
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- CN114321872B CN114321872B CN202210017849.4A CN202210017849A CN114321872B CN 114321872 B CN114321872 B CN 114321872B CN 202210017849 A CN202210017849 A CN 202210017849A CN 114321872 B CN114321872 B CN 114321872B
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000009471 action Effects 0.000 claims abstract description 108
- 238000005259 measurement Methods 0.000 claims description 40
- 230000008859 change Effects 0.000 claims description 20
- 230000002159 abnormal effect Effects 0.000 claims description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- 238000009529 body temperature measurement Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 4
- 239000000295 fuel oil Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001960 triggered effect Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000011418 maintenance treatment Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The application discloses a boiler protection method and a boiler protection device, which relate to the technical field of automatic control and are used for solving the problem of poor reliability of main protection action of a boiler in the related technology, wherein the boiler protection method comprises the following steps: acquiring target parameters associated with main protection actions of the boiler, and acquiring preset fault tolerance conditions corresponding to the target parameters; determining whether the target parameter is valid according to the fault tolerance condition; under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition; and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action.
Description
Technical Field
The application relates to the technical field of automatic control, in particular to a boiler protection method and a boiler protection device.
Background
In power plants, MFT (Main Fuel Trip) protection is the core of boiler safety protection. When the working condition possibly endangering the safe operation of the boiler occurs, the fuel entering the boiler furnace can be cut off rapidly by triggering the MFT protection action, so that the boiler is prevented from safety accidents.
In the related art, the control principle of MFT protection action (hereinafter referred to as main protection action) is that the operation parameters of a single component in a boiler body device or the operation parameters of a certain boiler auxiliary device are continuously monitored, and when any operation parameter is judged to meet a predetermined target protection condition, a main protection action signal is triggered to enable a boiler to execute the main protection action, so that fuel entering a boiler hearth is quickly cut off.
However, the related art has a problem in that the reliability of the main protection operation of the boiler is poor. For example, when the operation parameters of the single component in the collected boiler body equipment are abnormal, or the operation parameters of a certain boiler auxiliary equipment are abnormal, the main protection action of the boiler may malfunction or refusal to operate, so that the unplanned shutdown trip of the generator set is easily caused, and the safe and stable operation of the set is affected.
Disclosure of Invention
The embodiment of the application provides a boiler protection method and a boiler protection device, which solve the problem of poor reliability of main protection action of a boiler in the related technology.
In a first aspect, an embodiment of the present application provides a boiler protection method, including:
acquiring target parameters associated with main protection actions of the boiler, and acquiring preset fault tolerance conditions corresponding to the target parameters;
Determining whether the target parameter is valid according to the fault tolerance condition;
under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition;
and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action.
Optionally, in an embodiment of the present application, the target parameter includes an outage signal of an auxiliary machine of the boiler;
the fault tolerance condition comprises the following three indexes: the auxiliary machine outputs the shutdown signal, the auxiliary machine does not output the operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value;
the determining whether the target parameter is valid according to the fault tolerance condition includes:
and determining that the shutdown signal of the auxiliary machine is effective according to at least two of the three indexes satisfied by the auxiliary machine.
Optionally, in an embodiment of the present application, the target parameter includes a temperature parameter of a temperature measurement point;
the determining whether the target parameter is valid according to the fault tolerance condition includes:
and determining that the temperature parameter is effective according to the change rate of the temperature parameter being smaller than a second threshold value.
Optionally, the boiler protection method provided in the embodiment of the present application further includes:
and determining that the temperature parameter is invalid according to the change rate of the temperature parameter being greater than or equal to a second threshold value, and sending alarm information to prompt that the temperature measuring point is in an abnormal state.
Optionally, in an embodiment of the present application, the determining, according to the fault tolerance condition, whether the target parameter is valid includes:
according to the fact that the target parameter is effective, at least two identical measuring signals exist in three measuring signals located at the same measuring point;
wherein the target parameter comprises an analog signal and/or a switching value signal.
Optionally, the boiler protection method provided in the embodiment of the present application further includes:
according to the target parameter, one measurement signal is different from the other two measurement signals in three measurement signals of the same measuring point, the abnormal state of the measuring point is determined, and alarm information is sent out to prompt that the measuring point is in the abnormal state.
Optionally, in an embodiment of the present application, before determining whether the valid target parameter meets a target protection condition, the boiler protection method further includes:
Determining whether the primary protection action signal is reset;
under the condition that the main protection action signal is reset, the target protection condition is input;
the determining whether the valid target parameter meets a target protection condition under the condition that the target parameter is determined to be the valid target parameter comprises:
after the target protection condition is put into, determining whether the valid target parameter meets the target protection condition or not under the condition that the target parameter is determined to be the valid target parameter.
In a second aspect, an embodiment of the present application proposes a boiler protection device, including:
the acquisition module is used for acquiring target parameters associated with main protection actions of the boiler and acquiring preset fault-tolerant conditions corresponding to the target parameters;
the first determining module is used for determining whether the target parameter is valid or not according to the fault tolerance condition;
the second determining module is used for determining whether the effective target parameter meets a target protection condition or not under the condition that the target parameter is determined to be the effective target parameter;
and the triggering module is used for triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition so as to enable the boiler to execute the main protection action.
Optionally, in the boiler protection device provided in the embodiment of the present application,
the target parameters comprise shutdown signals of auxiliary machines of the boiler;
the fault tolerance condition comprises the following three indexes: the auxiliary machine outputs the shutdown signal, the auxiliary machine does not output the operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value;
the first determining module is configured to: and determining that the shutdown signal of the auxiliary machine is effective according to at least two of the three indexes satisfied by the auxiliary machine.
Optionally, in the boiler protection device provided in the embodiment of the present application, the target parameter includes a temperature parameter of a temperature measurement point;
the first determining module is configured to: and determining that the temperature parameter is effective according to the change rate of the temperature parameter being smaller than a second threshold value.
In the embodiment of the application, the target parameters associated with the main protection action of the boiler are acquired, and the preset fault tolerance conditions corresponding to the target parameters are acquired; determining whether the target parameter is valid according to the fault tolerance condition; under the condition that the target parameter is determined to be the effective target parameter, determining whether the effective target parameter meets the target protection condition; and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action. Therefore, before judging whether the target parameters meet the target protection conditions, judging whether the target parameters are valid according to the preset fault tolerance conditions, and discarding invalid target parameters, wherein the valid target parameters are used for judging the target protection conditions, so that the reliability of the target parameters is improved, and the reliability of triggering the main protection action is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic flow chart of a boiler protection method provided in an embodiment of the present application;
FIG. 2 is a schematic flow chart of another boiler protection method provided by an embodiment of the present application;
FIG. 3 is a schematic flow chart of another boiler protection method provided by an embodiment of the present application;
FIG. 4 is a schematic flow chart of another boiler protection method provided by an embodiment of the present application;
FIG. 5 is a schematic flow chart of another boiler protection method provided by an embodiment of the present application;
fig. 6 is a schematic block diagram of a boiler protection device according to an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The technical solutions provided in the embodiments of the present application are specifically described below with reference to fig. 1 to 6.
Fig. 1 is a schematic flow chart of a boiler protection method according to an embodiment of the present application.
As shown in fig. 1, the boiler protection method provided in the embodiment of the present application may include:
step 110: acquiring target parameters associated with main protection actions of the boiler, and acquiring preset fault tolerance conditions corresponding to the target parameters;
step 120: determining whether the target parameter is valid according to the fault tolerance condition;
step 130: under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition;
Step 140: and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action.
In step 110, the primary protection action of the boiler may refer to a primary fuel trip protection action of the boiler. The target parameter associated with the primary protection action of the boiler may be used for triggering control of the primary protection action of the boiler. For example, the target parameters may include a manual MFT action signal, a load change of a generator set, a shutdown signal of various boiler auxiliary equipment, a temperature value during operation of the boiler, a pressure value, a total air volume value, a feedwater flow value, and the like, without particular limitation in this application.
In step 110, the preset fault tolerance conditions corresponding to the target parameters may be used to comprehensively determine the validity, availability and reliability of the target parameters, and filter out the measured values of the target parameters that obviously do not meet the normal conditions or do not meet the fault tolerance conditions.
Wherein, the types of the target parameters are different, and the fault-tolerant conditions corresponding to the target parameters are also different.
There may be a variety of specific ways in which the target parameters are determined to be valid in step 120. For example, if the target parameter meets a preset fault tolerance condition, the target parameter is determined to be valid. For another example, if the target object corresponding to the target parameter meets the fault tolerance condition, the target parameter is determined to be valid. Wherein the target object may be a certain component in the boiler or a certain boiler auxiliary equipment. Of course, other ways are possible, and the present application is not particularly limited.
The fault-tolerant condition is used for determining whether the target parameter is valid or not, and the fault-tolerant condition is essentially used for judging the validity, the availability and the reliability of the target parameter. Specifically, if the target parameter is determined to be a valid target parameter according to the fault tolerance condition, the valid target parameter may be used in the subsequent step of determining the target protection condition. Otherwise, if the target parameter is determined to be an invalid target parameter according to the fault tolerance condition, the invalid target parameter is not suitable for the subsequent step of judging the target protection condition.
It can be appreciated that further, in the case where it is determined that the measured value of the target parameter acquired at the current time is invalid, the valid target parameter acquired at the previous history time may be used for the determination of the target protection condition at the current time.
In step 130, the target protection condition is a protection condition corresponding to the main protection action. The target protection conditions can be various, and if the target parameter meets any one target protection condition, the main protection action signal is triggered so that the boiler executes the main protection action.
Wherein the target protection condition may include at least one of: manual MFT action; tripping of the steam turbine and the unit load is more than 15%; both air pre-heaters trip; the two blowers are stopped completely; the two induced draft fans are completely stopped; when the single coal is fed and the fuel oil or the micro oil is not fed, the primary fan is completely stopped; the two fire detection cooling fans are completely stopped or the pressure of the fire detection cooling air is too low; the pressure of the hearth is too high; the furnace pressure is too low; the boiler feed water flow is too low; all the three water supply pumps are stopped; the total air quantity is less than 25%; loss of full hearth flame; loss of full fuel; a reheater protection action; the direct current power supply of the MFT relay is powered off; the desulfurization system exits; the main steam pressure is greater than a threshold (e.g., 28.27 Mpa), and so on.
In step 140, the primary protection action is used to shut off fuel to the boiler furnace. Before the target parameter is judged to meet the target protection condition, whether the target parameter is effective or not is judged according to a preset fault tolerance condition, invalid target parameters can be abandoned, the effective target parameters are used for judging the target protection condition, reliability of the target parameters is improved, and further reliability of triggering main protection actions is improved.
According to the boiler protection method, the target parameters related to the main protection action of the boiler are obtained, and the preset fault tolerance conditions corresponding to the target parameters are obtained; determining whether the target parameter is valid according to the fault tolerance condition; under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition; and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action. Therefore, before judging whether the target parameters meet the target protection conditions, judging whether the target parameters are valid according to the preset fault tolerance conditions, and discarding invalid target parameters, wherein the valid target parameters are used for judging the target protection conditions, so that the reliability of the target parameters is improved, and the reliability of triggering the main protection action is further improved.
The types of the target parameters are different, the fault tolerance conditions are different, and the specific ways for judging the effectiveness of the target parameters are different. The following will take fig. 2, 3 and 4 as examples.
In a specific embodiment, taking a target parameter as an outage signal of auxiliary equipment of a boiler as an example, as shown in fig. 2, the boiler protection method provided in the embodiment of the present application may include:
step 210: acquiring an outage signal of an auxiliary machine of the boiler, and acquiring a preset fault tolerance condition corresponding to the outage signal of the auxiliary machine of the boiler;
step 220: determining that the shutdown signal of the auxiliary machine is effective according to at least two of three indexes of the auxiliary machine meeting fault tolerance conditions; the fault tolerance condition comprises the following three indexes: the auxiliary machine outputs a shutdown signal, the auxiliary machine does not output an operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value;
step 230: under the condition that the shutdown signal of the auxiliary machine is determined to be the valid shutdown signal of the auxiliary machine, determining whether the valid shutdown signal of the auxiliary machine meets a target protection condition;
step 240: and triggering a main protection action signal when the effective shutdown signal of the auxiliary machine meets the target protection condition, so that the boiler executes the main protection action.
Step 210 may be a sub-step of step 110, among other things. Step 220 may be a sub-step of step 120. Step 230 may be a sub-step of step 130. Step 240 may be a sub-step of step 140.
In step 210, the target parameter may be an off-stream signal of an auxiliary machine of the boiler; the auxiliary machines of the boiler may include an air preheater, a blower, an induced draft fan, a primary air fan, a fire detection cooling fan or a water feed pump, etc., and the present application is not particularly limited.
In step 210, the preset fault tolerance condition corresponding to the shutdown signal of the auxiliary machine of the boiler may include the following three indexes: the auxiliary machine outputs a shutdown signal, the auxiliary machine does not output an operation signal, and a motor current of the auxiliary machine is less than a first threshold. The first threshold is a preset fixed value, and the first threshold is far smaller than the running current of the auxiliary machine when the motor normally runs.
The three indexes of the fault tolerance condition verify whether the shutdown signal of the auxiliary machine is effective or not from three aspects, and the reliability of the shutdown signal of the auxiliary machine is improved.
In step 220, if the auxiliary machine satisfies at least two of the three indexes of the fault tolerance condition, it is determined that the shutdown signal of the auxiliary machine is valid.
For example, the shutdown signal of the auxiliary machine is a shutdown signal of the feedwater pump, and the fault tolerance condition includes the feedwater pump outputting the shutdown signal, the feedwater pump not outputting the operation signal, and the motor current of the feedwater pump being less than a first threshold. And if the feedwater pump meets at least two of the three indexes of the fault tolerance condition, determining that the shutdown signal of the feedwater pump is effective.
In step 230, the target protection condition may include: both air pre-heaters trip; the two blowers are stopped completely; the two induced draft fans are completely stopped; when the single coal is fed and the fuel oil or the micro oil is not fed, the primary fan is completely stopped; the two fire detection cooling fans are completely stopped; all three water pumps are stopped, etc.
For example, the target protection condition may be a total stop of three feedwater pumps, wherein the three feedwater pumps are auxiliary equipment when the boiler is running. In step 230 and step 240, in the event that it is determined that the shut-down signal of the feedwater pump is a valid shut-down signal of the feedwater pump, determining whether the valid shut-down signal of the feedwater pump meets a target protection condition; and triggering a main protection action signal when the effective shutdown signal of the water supply pump meets the target protection condition, so that the boiler executes the main protection action.
According to the boiler protection method, the shutdown signal of the auxiliary machine of the boiler is obtained, and the preset fault-tolerant condition corresponding to the shutdown signal of the auxiliary machine of the boiler is obtained; determining that the shutdown signal of the auxiliary machine is effective according to at least two of three indexes of the auxiliary machine meeting fault tolerance conditions; the fault tolerance condition comprises the following three indexes: the auxiliary machine outputs a shutdown signal, the auxiliary machine does not output an operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value; under the condition that the shutdown signal of the auxiliary machine is determined to be the valid shutdown signal of the auxiliary machine, determining whether the valid shutdown signal of the auxiliary machine meets a target protection condition; and triggering a main protection action signal when the effective shutdown signal of the auxiliary machine meets the target protection condition, so that the boiler executes the main protection action. Therefore, before judging whether the shutdown signal of the auxiliary machine of the boiler meets the target protection condition, judging whether the shutdown signal of the auxiliary machine of the boiler is effective according to the preset fault tolerance condition, and using the effective shutdown signal of the auxiliary machine of the boiler for judging the target protection condition can improve the reliability of the shutdown signal of the auxiliary machine of the boiler, thereby improving the reliability of triggering the main protection action.
In another specific embodiment, taking a target parameter as a temperature parameter of a temperature measurement point as an example, as shown in fig. 3, a boiler protection method provided in the embodiment of the present application may include:
step 310: acquiring temperature parameters of a temperature measuring point, and acquiring preset fault-tolerant conditions corresponding to the temperature parameters of the temperature measuring point;
step 320: determining that the temperature parameter is valid according to the change rate of the temperature parameter being smaller than a second threshold;
step 330: under the condition that the temperature parameter is determined to be an effective temperature parameter, determining whether the effective temperature parameter meets a target protection condition;
step 340: and triggering a main protection action signal when the effective temperature parameter is determined to meet the target protection condition, so that the boiler executes the main protection action.
Step 310 may be a sub-step of step 110, among other things. Step 320 may be a sub-step of step 120. Step 330 may be a sub-step of step 130. Step 340 may be a sub-step of step 140.
In step 310, the target parameter may be a temperature parameter of a temperature measurement point; the temperature measurement points may include an inlet position and an outlet position of an absorption tower in the desulfurization system, an inlet position and an outlet position of an SCR reactor in the denitration system, and the like, and the temperature parameters of the temperature measurement points may be an inlet flue gas temperature of the absorption tower, an outlet flue gas temperature of the absorption tower, and the like, which are not particularly limited in this application.
In step 310, the preset fault tolerance condition corresponding to the temperature parameter of the temperature measurement point may be that the rate of change of the temperature parameter is less than a second threshold. Wherein the second threshold may be a preset value according to a rule, for example 5 degrees celsius per second. It will be appreciated that increasing the measured value of the temperature parameter by 5 degrees celsius per second may not be justified, and should be due to an abnormal factor, whereby it can be determined that the temperature parameter is not valid at a rate of change of the temperature parameter greater than 5 degrees celsius per second.
If the rate of change of the temperature parameter is less than the second threshold, then it may be determined that the temperature parameter is a valid temperature parameter in step 320.
For example, in step 330, the target protection condition may include a desulfurization system exit. Wherein the exiting of the desulfurization system specifically comprises the inlet flue gas temperature of the absorption tower being greater than a third threshold value and the outlet flue gas temperature of the absorption tower being greater than the third threshold value.
In step 340, when it is determined that the outlet flue gas temperature of the absorber tower meets the target protection condition, a main protection action signal is triggered, so that the boiler executes the main protection action.
In addition, when the temperature parameter is restored to the preset normal range, and the change rate of the temperature parameter is restored to the preset normal range and delayed for a period of time, the protection function (corresponding to the target protection condition) can be controlled to be automatically put into operation, so that the main protection action is prevented from being refused due to long-time withdrawal of the protection function.
According to the boiler protection method, the temperature parameters of the temperature measuring points are obtained, and the preset fault-tolerant conditions corresponding to the temperature parameters of the temperature measuring points are obtained; determining that the temperature parameter is valid according to the change rate of the temperature parameter being smaller than a second threshold; under the condition that the temperature parameter is determined to be an effective temperature parameter, determining whether the effective temperature parameter meets a target protection condition; and triggering a main protection action signal when the effective temperature parameter is determined to meet the target protection condition, so that the boiler executes the main protection action. Therefore, before judging whether the temperature parameters of the temperature measuring points meet the target protection conditions, judging whether the temperature parameters of the temperature measuring points are valid according to the preset fault tolerance conditions, discarding invalid target parameters, and using the valid temperature parameters of the temperature measuring points for judging the target protection conditions, so that the reliability of the temperature parameters of the temperature measuring points is improved, and the reliability of triggering main protection actions is further improved.
Moreover, as shown in fig. 3, the boiler protection method provided in the embodiment of the present application may further include:
step 350: and determining that the temperature parameter is invalid according to the change rate of the temperature parameter being greater than or equal to a second threshold value, and sending alarm information to prompt that the temperature measuring point is in an abnormal state.
In this way, the temperature parameter can be prevented from being invalid when the change rate of the temperature parameter is larger than or equal to the second threshold value, and alarm information is sent to prompt that the temperature measuring point is in an abnormal state. For example, an optical character plate is added to give an alarm to remind operators, so that the operators can conveniently conduct fault investigation and overhaul treatment on the temperature measuring points, and the main protection action is prevented from being triggered due to faults at the temperature measuring points, so that the boiler can safely and stably run.
In another specific embodiment, taking an example that the target parameter includes an analog signal and/or a switching value signal, as shown in fig. 4, the boiler protection method provided in the embodiment of the present application may include:
step 410: acquiring target parameters related to main protection actions of the boiler, and acquiring preset fault tolerance conditions corresponding to the target parameters, wherein the target parameters comprise analog quantity signals and/or switching value signals;
step 420: according to the fact that the target parameter is effective, at least two identical measuring signals exist in three measuring signals located at the same measuring point;
step 430: under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition;
Step 440: and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action.
Step 410 may refer to the details of step 110, among others.
Step 420 may be a sub-step of step 120, among others.
In step 410, the target parameter includes an analog signal and/or a switching value signal; the analog quantity signal can be a temperature parameter, a pressure parameter, an air quantity parameter and the like, and the switch quantity signal is a digital signal.
In step 410, the fault tolerant condition may be a two-out-of-three redundancy design, i.e., the fault tolerant condition may be: the target parameter has at least two identical measurement signals among the three measurement signals at the same measurement point.
In step 420, if there is one invalid measurement signal in the three measurement signals, the other two identical measurement signals can be regarded as valid measurement signals, and the valid measurement signals are used as valid target parameters, so that the reliability of the target parameters is improved.
Step 430 may refer to the specific content of step 130, which is not described herein; step 440 may refer to the details of step 140, and will not be described here.
According to the boiler protection method, the target parameters related to the main protection action of the boiler are obtained, and the preset fault tolerance conditions corresponding to the target parameters are obtained, wherein the target parameters comprise analog quantity signals and/or switching value signals; according to the fact that the target parameter is effective, at least two identical measuring signals exist in three measuring signals located at the same measuring point; under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition; and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action. Therefore, before judging whether the analog quantity signal and/or the switching quantity signal meet the target protection condition, judging whether the analog quantity signal and/or the switching quantity signal are valid according to the preset fault tolerance condition, discarding invalid analog quantity signals and/or switching quantity signals, and using the valid analog quantity signal and/or switching quantity signal for judging the target protection condition, thereby improving the reliability of the analog quantity signal and/or switching quantity signal and further improving the reliability of triggering the main protection action.
Moreover, as shown in fig. 4, the boiler protection method provided in the embodiment of the present application may further include:
step 450: according to the target parameter, one measurement signal is different from the other two measurement signals in three measurement signals of the same measuring point, the abnormal state of the measuring point is determined, and alarm information is sent out to prompt that the measuring point is in the abnormal state.
The measuring point may be a position where a measurement signal of the target parameter is acquired.
Thus, the analog quantity signal and/or the switching value signal with the three-out-two redundancy design can realize automatic inspection alarm. When one measurement signal is different from the other two measurement signals in three measurement signals of the same measurement point of the target parameter, the measurement point can be determined to be in an abnormal state, and an alarm prompt can be sent. The fault detection and maintenance treatment of the measuring point is convenient for the staff, and the main protection action is prevented from being triggered due to the fault at the measuring point, so that the boiler can safely and stably run.
In addition, in practical applications, when the target parameter (for example, the air volume signal) is a parameter that needs compensation calculation of other parameters (for example, the temperature signal and the pressure signal), in order to prevent the compensation signal from being distorted due to the fault of the compensation signal, fault tolerance measures such as redundancy configuration, quality judgment, setting up and down limiting and the like may be adopted for the compensation signal (for example, the temperature signal and the pressure signal) to judge whether the compensation signal is effective.
For example, in step 110, the fault tolerance condition may further include an upper and lower limit value determination, a quality determination, a redundancy-by-three determination, and so on. Accordingly, in step 120, if the measured value of the target parameter is between the preset lower limit value and the preset upper limit value, it may be determined that the target parameter is a valid target parameter. Alternatively, in step 120, if the quality of the target parameter is good, it may be determined that the target parameter is a valid target parameter. Alternatively, in step 120, if two identical measurement signals exist in three measurement signals of the target parameter at the same measurement point, it may be determined that the target parameter is a valid target parameter. Thus, the distortion of the compensated signal can be prevented, the reliability of the compensated signal can be improved, and the reliability of the main protection work can be further improved.
In addition, for the target parameters transmitted by the cross-system, compared with the wireless connection and wireless communication mode adopted between two systems, the two systems adopt wired connection, so that the effectiveness and reliability of the target parameters transmitted by the cross-system are higher; similarly, for the target parameters transmitted across controllers, compared with the wireless connection and wireless communication mode adopted between the two controllers, the two controllers are connected by wires, so that the effectiveness and reliability of the target parameters transmitted across the controllers are higher.
In addition, in a specific embodiment, a self-locking function of protection condition input/exit can be added, and when the main protection action signal is not reset, the protection condition input is forbidden, so that the risk of artificial misoperation is avoided, the safety of the protection function input/output is improved, and the reliability of the main protection action is further improved.
As shown in fig. 5, the boiler protection method provided in the embodiment of the present application may include:
step 510: acquiring target parameters associated with main protection actions of the boiler, and acquiring preset fault tolerance conditions corresponding to the target parameters;
step 520: determining whether the target parameter is valid according to the fault tolerance condition;
step 530: determining whether the main protection action signal is reset;
step 540: under the condition that the main protection action signal is reset, inputting target protection conditions;
step 550: after putting into the target protection condition, under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets the target protection condition;
step 560: and triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition, so that the boiler executes the main protection action.
Wherein, step 510 may refer to the specific content of step 110; step 520 may refer to the details of step 120; step 550 may be a sub-step of step 130, and reference may be made to the details of step 130; step 560 may refer to the details of step 140, and is not described herein.
In step 530 and step 540, it can be appreciated that in the case where the main protection action signal is not reset (i.e., not cleared), since there is an uncleaned main protection action signal in the control system, the main protection action will be directly caused to malfunction once the target protection condition is entered. Based on this, determining whether the primary guard action signal is reset; under the condition that the main protection action signal is reset, inputting target protection conditions; on the contrary, when the main protection operation signal is not reset, the target protection condition is prohibited from being put in.
Therefore, the safety of switching on and off of the protection function is improved, the false action of the main protection action caused by switching on the protection function under the condition that the main protection action signal is not reset is avoided, and the reliability of the main protection action is further improved.
Based on the same conception as the method embodiment, the embodiment of the application also provides a boiler protection device.
It should be noted that, the boiler protection device provided in the embodiment of the present application may execute the boiler protection method described above. In the embodiment of the application, a method for executing boiler protection by a boiler protection device is taken as an example, and the boiler protection device provided in the embodiment of the application is described.
Fig. 6 is a schematic flow chart of a boiler protection device provided in an embodiment of the present application.
As shown in fig. 6, an embodiment of the present application provides a boiler protection device, which may include:
an obtaining module 601, configured to obtain a target parameter associated with a main protection action of the boiler, and obtain a preset fault tolerance condition corresponding to the target parameter;
a first determining module 602, configured to determine whether the target parameter is valid according to the fault tolerance condition;
a second determining module 603, configured to determine, if the target parameter is determined to be a valid target parameter, whether the valid target parameter meets a target protection condition;
and the triggering module 604 is configured to trigger a main protection action signal when it is determined that the valid target parameter meets a target protection condition, so that the boiler executes a main protection action.
The boiler protection device provided by the embodiment of the application comprises: the acquisition module is used for acquiring target parameters associated with main protection actions of the boiler and acquiring preset fault-tolerant conditions corresponding to the target parameters; the first determining module is used for determining whether the target parameter is valid or not according to the fault tolerance condition; the second determining module is used for determining whether the effective target parameter meets a target protection condition or not under the condition that the target parameter is determined to be the effective target parameter; and the triggering module is used for triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition so as to enable the boiler to execute the main protection action. Therefore, before judging whether the target parameters meet the target protection conditions, judging whether the target parameters are valid according to the preset fault tolerance conditions, and discarding invalid target parameters, wherein the valid target parameters are used for judging the target protection conditions, so that the reliability of the target parameters is improved, and the reliability of triggering the main protection action is further improved.
Optionally, in the boiler protection device provided in the embodiment of the present application,
the target parameters comprise shutdown signals of auxiliary machines of the boiler;
the fault tolerance condition comprises the following three indexes: the auxiliary machine outputs the shutdown signal, the auxiliary machine does not output the operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value;
the first determining module is configured to: and determining that the shutdown signal of the auxiliary machine is effective according to at least two of the three indexes satisfied by the auxiliary machine.
Therefore, before judging whether the shutdown signal of the auxiliary machine of the boiler meets the target protection condition, judging whether the shutdown signal of the auxiliary machine of the boiler is effective according to the preset fault tolerance condition, and using the effective shutdown signal of the auxiliary machine of the boiler for judging the target protection condition can improve the reliability of the shutdown signal of the auxiliary machine of the boiler, thereby improving the reliability of triggering the main protection action.
Optionally, in the boiler protection device provided in the embodiment of the present application, the target parameter includes a temperature parameter of a temperature measurement point; the first determining module is configured to: and determining that the temperature parameter is effective according to the change rate of the temperature parameter being smaller than a second threshold value.
Therefore, before judging whether the temperature parameters of the temperature measuring points meet the target protection conditions, judging whether the temperature parameters of the temperature measuring points are valid according to the preset fault tolerance conditions, discarding invalid target parameters, and using the valid temperature parameters of the temperature measuring points for judging the target protection conditions, so that the reliability of the temperature parameters of the temperature measuring points is improved, and the reliability of triggering main protection actions is further improved.
Optionally, the boiler protection device provided in the embodiment of the present application further includes: a third determining module, configured to: and determining that the temperature parameter is invalid according to the change rate of the temperature parameter being greater than or equal to a second threshold value, and sending alarm information to prompt that the temperature measuring point is in an abnormal state.
In this way, the temperature parameter can be prevented from being invalid when the change rate of the temperature parameter is larger than or equal to the second threshold value, and alarm information is sent to prompt that the temperature measuring point is in an abnormal state. The method is convenient for staff to conduct fault investigation and overhaul treatment on the temperature measuring point, and prevents the main protection action from being triggered due to faults at the temperature measuring point, so that the boiler can safely and stably run.
Optionally, in the boiler protection device provided in the embodiment of the present application, the first determining module is configured to: according to the fact that the target parameter is effective, at least two identical measuring signals exist in three measuring signals located at the same measuring point; wherein the target parameter comprises an analog signal and/or a switching value signal.
Therefore, before judging whether the analog quantity signal and/or the switching quantity signal meet the target protection condition, judging whether the analog quantity signal and/or the switching quantity signal are effective according to the preset fault tolerance condition, and using the effective analog quantity signal and/or switching quantity signal for judging the target protection condition, so that the reliability of the analog quantity signal and/or the switching quantity signal is improved, and the reliability of triggering the main protection action is further improved.
Optionally, the boiler protection device provided in the embodiment of the present application further includes:
a fourth determining module, configured to: according to the target parameter, one measurement signal is different from the other two measurement signals in three measurement signals of the same measuring point, the abnormal state of the measuring point is determined, and alarm information is sent out to prompt that the measuring point is in the abnormal state.
Thus, the analog quantity signal and/or the switching value signal with the three-out-two redundancy design can realize automatic inspection alarm. When one measurement signal is different from the other two measurement signals in three measurement signals of the same measurement point of the target parameter, the measurement point can be determined to be in an abnormal state, and an alarm prompt can be sent. The fault detection and maintenance treatment of the measuring point is convenient for the staff, and the main protection action is prevented from being triggered due to the fault at the measuring point, so that the boiler can safely and stably run.
Optionally, the boiler protection device provided in the embodiment of the present application further includes:
a fifth determining module, configured to: before determining whether the valid target parameter meets a target protection condition, determining whether the main protection action signal is reset;
a throw-in module for: under the condition that the main protection action signal is reset, the target protection condition is input;
correspondingly, the second determining module is specifically configured to: after the target protection condition is put into, determining whether the valid target parameter meets the target protection condition or not under the condition that the target parameter is determined to be the valid target parameter.
Therefore, the safety of switching on and off of the protection function is improved, the false action of the main protection action caused by switching on the protection function under the condition that the main protection action signal is not reset is avoided, and the reliability of the main protection action is further improved.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. A method of protecting a boiler, comprising:
acquiring target parameters associated with main protection actions of the boiler, and acquiring preset fault tolerance conditions corresponding to the target parameters;
determining whether the target parameter is valid according to the fault tolerance condition;
under the condition that the target parameter is determined to be a valid target parameter, determining whether the valid target parameter meets a target protection condition;
when the effective target parameter is determined to meet the target protection condition, triggering a main protection action signal so as to enable the boiler to execute main protection action;
wherein, under the condition that the target parameter comprises the shutdown signal of the auxiliary machine of the boiler, the fault tolerance condition corresponding to the target parameter comprises the following three indexes: the auxiliary machine outputs the shutdown signal, the auxiliary machine does not output the operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value;
Wherein, under the condition that the target parameter comprises the temperature parameter of the temperature measuring point, the fault tolerance condition corresponding to the target parameter comprises: the change rate of the temperature parameter of the temperature measuring point is smaller than a second threshold value;
wherein, in the case that the target parameter includes an analog quantity signal and/or a switching quantity signal, the fault tolerance condition corresponding to the target parameter includes: the target parameter has at least two identical measurement signals among three measurement signals at the same measuring point.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
in the case that the target parameter includes an outage signal of an auxiliary machine of the boiler, the determining whether the target parameter is valid according to the fault tolerance condition includes:
determining that the shutdown signal of the auxiliary machine is effective according to at least two of the three indexes satisfied by the auxiliary machine;
wherein the target protection condition includes at least one of: both air pre-heaters trip; the two blowers are stopped completely; the two induced draft fans are completely stopped; when the single coal is fed and the fuel oil or the micro oil is not fed, the primary fan is completely stopped; the two fire detection cooling fans are completely stopped; all three water supply pumps are stopped.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
in the case that the target parameter includes a temperature parameter of a temperature measurement point, determining whether the target parameter is valid according to the fault tolerance condition includes:
determining that the temperature parameter is valid according to the change rate of the temperature parameter being smaller than a second threshold;
wherein, the temperature parameter of the temperature measuring point comprises: the inlet flue gas temperature of the absorption tower and the outlet flue gas temperature of the absorption tower, and the target protection conditions comprise: the temperature of the inlet flue gas of the absorption tower is larger than a third threshold value, and the temperature of the outlet flue gas of the absorption tower is larger than the third threshold value.
4. A method according to claim 3, characterized in that the method further comprises:
and determining that the temperature parameter is invalid according to the change rate of the temperature parameter being greater than or equal to a second threshold value, and sending alarm information to prompt that the temperature measuring point is in an abnormal state.
5. The method of claim 1, wherein the step of determining the position of the substrate comprises,
in the case that the target parameter includes an analog signal and/or a switching value signal, the determining whether the target parameter is valid according to the fault tolerance condition includes:
And determining that the target parameter is effective according to the fact that at least two identical measurement signals exist in three measurement signals positioned at the same measuring point of the target parameter.
6. The method of claim 5, wherein the method further comprises:
according to the target parameter, one measurement signal is different from the other two measurement signals in three measurement signals of the same measuring point, the abnormal state of the measuring point is determined, and alarm information is sent out to prompt that the measuring point is in the abnormal state.
7. The method of claim 1, wherein prior to determining whether the valid target parameter meets a target protection condition, the method further comprises:
determining whether the primary protection action signal is reset;
under the condition that the main protection action signal is reset, the target protection condition is input;
the determining whether the valid target parameter meets a target protection condition under the condition that the target parameter is determined to be the valid target parameter comprises:
after the target protection condition is put into, determining whether the valid target parameter meets the target protection condition or not under the condition that the target parameter is determined to be the valid target parameter.
8. A boiler protection device, comprising:
the acquisition module is used for acquiring target parameters associated with main protection actions of the boiler and acquiring preset fault-tolerant conditions corresponding to the target parameters;
the first determining module is used for determining whether the target parameter is valid or not according to the fault tolerance condition;
the second determining module is used for determining whether the effective target parameter meets a target protection condition or not under the condition that the target parameter is determined to be the effective target parameter;
the triggering module is used for triggering a main protection action signal when the effective target parameter is determined to meet the target protection condition so as to enable the boiler to execute the main protection action;
wherein, under the condition that the target parameter comprises the shutdown signal of the auxiliary machine of the boiler, the fault tolerance condition corresponding to the target parameter comprises the following three indexes: the auxiliary machine outputs the shutdown signal, the auxiliary machine does not output the operation signal, and the motor current of the auxiliary machine is smaller than a first threshold value;
wherein, under the condition that the target parameter comprises the temperature parameter of the temperature measuring point, the fault tolerance condition corresponding to the target parameter comprises: the change rate of the temperature parameter of the temperature measuring point is smaller than a second threshold value;
Wherein, in the case that the target parameter includes an analog quantity signal and/or a switching quantity signal, the fault tolerance condition corresponding to the target parameter includes: the target parameter has at least two identical measurement signals among three measurement signals at the same measuring point.
9. The apparatus of claim 8, wherein the device comprises a plurality of sensors,
in the case that the target parameter includes an off-stream signal of an auxiliary machine of the boiler, the first determining module is configured to: determining that the shutdown signal of the auxiliary machine is effective according to at least two of the three indexes satisfied by the auxiliary machine;
wherein the target protection condition includes at least one of: both air pre-heaters trip; the two blowers are stopped completely; the two induced draft fans are completely stopped; when the single coal is fed and the fuel oil or the micro oil is not fed, the primary fan is completely stopped; the two fire detection cooling fans are completely stopped; all three water supply pumps are stopped.
10. The apparatus of claim 8, wherein the device comprises a plurality of sensors,
in the case that the target parameter includes a temperature parameter of a temperature measurement point, the first determining module is configured to: determining that the temperature parameter is valid according to the change rate of the temperature parameter being smaller than a second threshold;
Wherein, the temperature parameter of the temperature measuring point comprises: the inlet flue gas temperature of the absorption tower and the outlet flue gas temperature of the absorption tower, and the target protection conditions comprise: the temperature of the inlet flue gas of the absorption tower is larger than a third threshold value, and the temperature of the outlet flue gas of the absorption tower is larger than the third threshold value.
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