CN211822331U - Steam drum water level protection device and power generation system - Google Patents
Steam drum water level protection device and power generation system Download PDFInfo
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- CN211822331U CN211822331U CN202020388149.2U CN202020388149U CN211822331U CN 211822331 U CN211822331 U CN 211822331U CN 202020388149 U CN202020388149 U CN 202020388149U CN 211822331 U CN211822331 U CN 211822331U
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Abstract
The embodiment of the utility model provides a steam pocket water level protection device and power generation system, steam pocket water level protection device is applied to power generation system, power generation system includes the steam pocket and is connected the water supply line of steam pocket, steam pocket water level protection device includes: the flow transmitter, P logic delay circuits, a first data selector, a second data selector and a logic operation circuit, wherein P is an integer greater than 1. The embodiment of the utility model provides a help improving the reliability of steam pocket water supply process, reduce the risk that leads to equipment to damage among the power generation system because of the water supply accident.
Description
Technical Field
The utility model relates to a power generation technical field especially relates to a steam pocket water level protection device and power generation system.
Background
In a related power generation system such as a thermal power plant drum boiler, a main water supply pipeline is a main pipeline directly supplying water to a boiler, and in the operation of the power generation system, an actuator of an electric door of the main water supply pipeline may be influenced by internal or external factors, so that the valve is automatically closed by misoperation of the actuator, for example: because the position of the electric door of the main water supply pipeline vibrates, the internal wiring of the actuator is loosened, and the malfunction of the actuator can be further caused to automatically close the valve. In the prior art, often be difficult to in time discover the condition of the executor malfunction of main water supply pipeline electrically operated gate, close and fail in time to discover when the executor mistake, can lead to main water supply pipeline to break off, the boiler is burnt futilely, and then brings great equipment and damages the risk.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a steam pocket water level protection device and power generation system to solve prior art and be difficult to in time discover the condition of executor malfunction in the main feedwater, bring the defect of great equipment damage risk.
In order to solve the technical problem, the utility model discloses a realize like this:
an embodiment of the utility model provides a steam pocket water level protection device is applied to power generation system, power generation system includes the steam pocket and is connected the water supply line of steam pocket, steam pocket water level protection device includes: the flow transmitter, P logic delay circuits, a first data selector, a second data selector and a logic operation circuit, wherein P is an integer greater than 1;
the flow transmitter is arranged on the water supply pipeline and is respectively connected with the input end of each logic delay circuit in the P logic delay circuits; the output end of each logic delay circuit in the P logic delay circuits is respectively connected with the input end of the first data selector and the input end of the second data selector, and the output end of the first data selector and the output end of the second data selector are respectively connected with the first input end and the second input end of the logic operation circuit.
The embodiment of the utility model also provides a power generation system, which comprises a steam pocket, a water supply pipeline connected with the steam pocket and the steam pocket water level protection device;
and the flow transmitter of the steam drum water level protection device is arranged on the water supply pipeline.
The embodiment of the utility model provides a steam pocket water level protection device, through setting up flow transmitter, P logic delay circuit, first data selector, second data selector and logical operation circuit, can further during the time delay of setting for, flow maximum value and the difference of minimum value in the water supply line acquire, and whether combine the flow threshold value to judge the condition that whether has the water supply line to close, and then help improving the reliability of steam pocket feedwater process, reduce the risk that leads to equipment to damage among the power generation system because of the feedwater accident.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural view of a drum water level protection device provided in an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a drum water level protection device provided in an embodiment of the present invention;
fig. 3 is a flow chart of a method for protecting the water level of a steam drum by using the device for protecting the water level of a steam drum provided by the embodiment of the utility model.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the embodiment of the utility model provides a steam pocket water level protection device is applied to power generation system, power generation system includes the steam pocket and is connected the water supply line of steam pocket, steam pocket water level protection device includes: the flow transmitter 110, P logic delay circuits 120, a first data selector 130, a second data selector 140 and a logic operation circuit 150, wherein P is an integer greater than 1;
the flow transmitter 110 is installed on the water supply pipeline, and the flow transmitter 110 is connected to the input end of each logic delay circuit 120 in the P logic delay circuits 120; the output end of each logic delay circuit 120 of the P logic delay circuits 120 is respectively connected to the input end of the first data selector 130 and the input end of the second data selector 140, and the output end of the first data selector 130 and the output end of the second data selector 140 are respectively connected to the first input end and the second input end of the logic operation circuit 150.
It will be readily appreciated that the flow transmitter 110 may be a sensor structure capable of acquiring flow data in a feedwater conduit.
The logic delay circuit 120 may be a circuit structure that performs a preset operation after delaying a set time after receiving the trigger signal, specifically, in this embodiment, the logic delay circuit 120 may have an input end for connecting with the flow transmitter 110 and a corresponding control end, and the control end obtains data collected by the flow transmitter 110 after delaying the set time, for example, 20s, 40s or other time, after receiving the trigger signal; in this embodiment, the P logic delay circuits 120 may correspond to a plurality of delays, for example, 20s, 40s, 60s, 80s, 100s, 120s, and the like.
The data selector may be configured to select a plurality of input data, for example, a maximum value, a minimum value, or a median value among the plurality of input data, and in this embodiment, the first data selector 130 may be configured to select a plurality of input data, that is, a maximum value among the flow data; the second data selector 140 may operate to minimize the plurality of input flow data.
The logic operation circuit 150 may be a circuit that performs a logic operation on input data and inputs an operation result, and in this embodiment, the logic operation circuit 150 may be a circuit that compares a difference between a maximum value and a minimum value in flow rate data with a flow rate threshold value. If the difference between the maximum value and the minimum value is larger than or equal to the flow threshold value, the main water supply flow rate is relatively high, the water supply pipeline is probably closed, and in order to reduce the risk of equipment failure of the power generation system, an instruction for prompting a user or controlling the opening of the water supply pipeline can be input. The above functions of calculating the difference and comparing the magnitudes can be realized by the existing logic operation circuit, and are not described herein again.
The embodiment of the utility model provides a steam pocket water level protection device, through setting up flow transmitter 110, P logic delay circuit 120, first data selector 130, second data selector 140 and logical operation circuit 150, can further during the time delay of setting for, flow maximum value and the difference of minimum in the water supply line acquire, and combine the flow threshold value to judge whether there is the condition that the water supply line closed, and then help improving the reliability of steam pocket feedwater process, reduce the risk that leads to equipment to damage among the power generation system because of the feedwater accident.
In one example, the water supply line is a main water supply line of the steam drum.
Optionally, as shown in fig. 2, the drum water level protection device further includes a third data selector 160, the number of the flow transmitters 110 is Q, and Q is an integer greater than 1;
the Q flow transmitters 110 are all connected to the input end of the third data selector 160, and the output end of the third data selector 160 is respectively connected to the input end of each logic delay circuit 120 in the P logic delay circuits 120.
As shown above, the data selector can be used to select a plurality of input data, in this embodiment, the number of the flow transmitters 110 is set to be multiple, and data provided by a plurality of flow transmitters 110 at the same time can be selected based on the third data selector 160, for example, a median is taken, so that the quality of the final flow data can be effectively improved.
In one example, the flow transmitter 110 is coupled to an analog input terminal of a Distributed Control System (DCS) via a cable, and the data selector receives data from the DCS for selection. Optionally, a display device is further connected to the DCS for displaying the flow data collected by the flow transmitter 110.
Optionally, as shown in fig. 2, the first data selector 130 includes M first sub-data selectors 131 and one second sub-data selector 132, and the second data selector 140 includes M third sub-data selectors 141 and one fourth sub-data selector 142; the P logic delay circuits 120 belong to M groups of preset logic delay circuits 120; the M preset logic delay circuit 120 groups, the M first sub-data selectors 131, and the M third sub-data selectors 141 are in one-to-one correspondence;
the output ends of all logic delay circuits 120 in each preset logic delay circuit 120 group are connected to the input end of a corresponding first sub-data selector 131, and are connected to the input end of a corresponding third sub-data selector 141, the output ends of the M first sub-data selectors 131 are connected to the input end of the second sub-data selector 132, the output ends of the M third sub-data selectors 141 are connected to the input end of the fourth sub-data selector 142, and the output ends of the second sub-data selector 132 and the output end of the fourth sub-data selector are respectively connected to the first input end and the second input end of the logic operation circuit 150; wherein M is an integer greater than 1 and less than Q.
Taking P equal to 9 and P logic Delay circuits 120 respectively corresponding to delays (Delay)20s, 40s, 60s, 80s, 100s, 120s, 140s, 160s, and 180s as examples, the logic Delay circuits 120 with delays of 20s, 40s, and 60s may be used as the first logic Delay circuit 120 group, the logic Delay circuits 120 with delays of 80s, 100s, and 120s may be used as the second logic Delay circuit 120 group, and the logic Delay circuits 120 with delays of 140s, 160s, and 180s may be used as the third logic Delay circuit 120 group. The first sub-data selector 131 may be for one out of three (Thr Sel) taking the maximum value; the outputs of the three logic delay circuits 120 corresponding to each logic delay circuit 120 group are all input into a corresponding first sub-data selector 131 to output the maximum value, and the outputs of the three first sub-data selectors 131 are all input into a second sub-data selector 132 to further select one from three to obtain the maximum value, so as to obtain the maximum value of the flow in the water supply pipeline under 9 delays. Similarly, the third sub-data selector 141 may be configured to select the minimum value by three, and the outputs of the three third sub-data selectors 141 are all input to the fourth sub-data selector 142 to further select the minimum value by three, so as to obtain the minimum value of the flow rate in the water supply pipeline under 9 delays.
The maximum flow value and the minimum flow value are respectively input to the logic operation circuit 150, and the logic operation circuit 150 may further compare the difference between the two inputs with a flow threshold value and output a corresponding comparison result.
Compared with a structure that the output values from the plurality of logic delay circuits 120 are directly taken as the maximum value or the minimum value, the embodiment is beneficial to reducing the number of input data of each data selector by connecting the plurality of data selectors in series and taking the maximum value or the minimum value step by step, thereby being beneficial to reducing the operation difficulty and saving the operation cost.
In some possible embodiments, the maximum value or the minimum value can be obtained in three or more stages according to actual needs, that is, three or more data selectors are connected in series on one circuit for data selection to obtain the maximum value and the minimum value of the flow of the water supply pipeline.
Optionally, as shown in fig. 2, the power generation system further includes an electric gate installed on the water supply pipe, and the drum water level protection device includes a first and gate circuit 210;
the output end of the logic operation circuit 150 and the electric gate are respectively connected to the first input end and the second input end of the first and circuit 210, and the output end of the first and circuit 210 is connected to the electric gate.
In this embodiment, the logic operation circuit 150 may compare the difference between the maximum flow value and the minimum flow value of the water supply pipe in the maximum delay with the flow threshold value, and output a corresponding comparison result. The electric door may include a valve, an actuator 220 for adjusting the opening of the valve, and an opening monitoring device 230 for outputting state information of the electric door, wherein the valve may be driven by the actuator 220 to open or close the water supply pipe. The first and circuit 210 may perform an and operation according to the output signals of the logic operation circuit 150 and the electric gate, so as to obtain a corresponding operation result.
Similarly, taking the above-mentioned steam drum water level protection device with 9 logic delay circuits 120 as an example, the first data selector 130 and the second data selector 140 can finally obtain the maximum flow value and the minimum flow value of the water supply pipeline within 180s, respectively, and if the flow threshold is 100t/h, the difference between the maximum flow value and the minimum flow value of the water supply pipeline within 180s is greater than or equal to 100t/h, a digital signal 1 can be output, which indicates that the actuator 220 of the electric valve may be in malfunction to close the valve. The electric door may include a valve, an actuator 220, and an opening degree monitoring device 230, and if the opening degree monitoring device 230 is used to monitor whether the valve of the electric door is opened in place, and if the valve of the electric door is not opened in place, the digital signal input to the first and circuit 210 may be 1. When the digital signals output by the logic operation circuit 150 and the electric door correspondingly are both 1, the digital signal 1 is obtained through the operation of the first and circuit 210, which indicates that the situation of water flow reduction in the water supply pipeline caused by the valve problem occurs, at this time, the signal output by the first and circuit 210 can be used for controlling the actuator 220 of the electric door to act and opening the valve of the water supply pipeline, so that the situation of dry burning of the boiler caused by low water level of the steam pocket due to the closing of the electric door on the water supply pipeline is favorably eliminated, the reliability of the water supply function of the steam pocket is improved, and meanwhile, the risk of boiler damage caused by water supply is reduced.
In one example, when the digital signal output by the logic operation circuit 150 is 0, it indicates that the difference between the maximum flow value and the minimum flow value of the water supply pipeline within 180s is less than 100t/h, and may be within a normal water supply flow floating interval. When the digital signal input to the first and circuit 210 corresponding to the opening degree monitoring device 230 is 0, it indicates that the valve of the electric door is opened. In either case, no further opening of the valve is required.
Optionally, the drum water level protection device further includes a second and gate circuit 240 and a nand gate circuit 250, first input ends of the electric gate, the not gate circuit 250 and the second and gate circuit 240 are sequentially connected, a second input end of the second and gate circuit 240 is a power generation system grid-connected state information input end, and an output end of the second and gate circuit 240 is connected to a second input end of the first and gate circuit 210.
In this embodiment, considering that in the electrically operated gate on the water supply pipeline, the opening degree monitoring device 230 may output a corresponding signal after the valve is opened to the right position, so a not gate circuit 250 is added after the electrically operated gate; in addition, it is also contemplated that the power generation system may be in a commissioning, overhaul, or other state when not grid-connected, and there may be no risk of boiler damage due to feedwater. Therefore, in this embodiment, on the basis of the previous embodiment, the nand gate circuit 250 of the second and-gate circuit 240 is further provided, which is helpful for controlling the opening of the valve of the electric gate when the power generation system is connected to the grid, the in-place signal of the electric gate valve is not detected, and the difference between the maximum flow value and the minimum flow value of the water supply pipeline is greater than or equal to the flow threshold value, so as to improve the rationality of control.
In one example, a second input terminal of the second and circuit 240 is connected to a grid-connected state determination device 260 for obtaining grid-connected state information.
The embodiment of the utility model provides a steam pocket water level protection device compares in the current artifical mode of judging whether the feed water flow has the deviation, has stable, reliable characteristics. And the steam drum water level protection device is simple to install and debug on site, has high reliability, and is beneficial to ensuring the safe operation of the boiler.
The embodiment of the utility model also provides a power generation system, which comprises a steam pocket, a water supply pipeline connected with the steam pocket and the steam pocket water level protection device;
and the flow transmitter of the steam drum water level protection device is arranged on the water supply pipeline.
It should be noted that, the power generation system is a system to which the above-mentioned drum water level protection device is applied, and all implementation manners in the above-mentioned embodiment of the drum water level protection device are applicable to the embodiment of the power generation system, and the same technical effect can be achieved.
The following description is directed to a drum water level protection method in a drum water level protection device provided by an embodiment of the present invention, and as shown in fig. 3, the drum water level protection method includes:
and 304, generating a first instruction under the condition that the flow difference value is greater than or equal to the flow threshold value, wherein the first instruction is used for controlling the water supply pipeline to be opened.
The trigger signal is used for controlling the logic delay circuit to start timing, and when the delay reaches a set value, the flow data at the moment is obtained. Under the condition of receiving the trigger signal, the P logic delay circuits can correspond to P delays and respectively collect flow data under the P delays; for example, 9 logic delay circuits are arranged to acquire 9 flow data under 9 delays of 20s, 40s, 60s, … … and 180s respectively.
After P flow data are collected, the maximum flow data and the minimum flow data can be selected from the P flow data, and the difference value between the two flow data can reflect the maximum variation of the water flow in the water supply pipeline in a period of time.
In combination with practical applications, when the steam drum is in a normal working state, the variation of the water flow is usually within an experimental interval, and when the variation of the water flow is large in a period of time, it is possible that the variation is caused by closing the water supply pipeline. Therefore, it is possible to determine whether the flow difference between the maximum flow data and the minimum flow data is greater than or equal to the flow threshold, and if the flow difference is greater than or equal to the flow threshold, generate a first instruction for controlling the opening of the water supply pipe, for example, open a valve of an electric valve in the water supply pipe according to the first instruction.
The steam drum water level protection method comprises the steps of calculating the difference value between the maximum flow data and the minimum flow data in P flow data by acquiring P flow data under P time delays, and generating a first instruction for controlling the opening of a water supply pipeline under the condition that the difference value is greater than or equal to a flow threshold value; the reliability of the steam drum water supply process is improved, and the risk of equipment damage in the power generation system caused by water supply accidents is reduced.
Optionally, the first instruction may also be used to control a set warning device to send warning information.
Optionally, the acquiring P traffic data at P delays includes:
acquiring Q original flow information from Q flow transmitters under any one of the P delays, wherein the Q flow transmitters correspond to the Q original flow information one by one, and Q is an integer greater than 1;
and determining the flow data corresponding to the time delay from the Q original flow information according to a first preset rule.
In this embodiment, Q pieces of original flow information from the Q pieces of flow transmitters redundantly provided can be simultaneously acquired at any time delay. The first preset rule may be a median or an average, so that the quality of the traffic data may be effectively improved.
Optionally, determining the maximum flow rate data and the minimum flow rate data from the P flow rate data includes:
when P is larger than 2, distributing the P delays into M delay groups, wherein M is an integer larger than 1 and smaller than P;
respectively acquiring initial maximum flow data and initial minimum flow data corresponding to each delay group in the M delay groups to acquire M initial maximum flow data and M initial minimum flow data;
and determining maximum flow data from the M initial maximum flow data, and determining minimum flow data from the M initial minimum flow data.
In the method for protecting the water level of the steam drum, the process of determining the maximum flow data and the minimum flow data from the P flow data can be decomposed into a plurality of stages for carrying out. For example, P delays correspond to delays 20s, 40s, 60s, 80s, 100s, 120s, 140s, 160s, and 180s, respectively, 9 delays may be first allocated to 3 delay groups, where 20s, 40s, and 60s are the first group, 80s, 100s, and 120s are the second group, and 140s, 160s, and 180s are the third group, initial maximum flow data and initial minimum flow data are respectively obtained for the three delay groups, then maximum flow data is determined from the 3 initial maximum flow data, and minimum flow data is determined from the 3 initial minimum flow data. Therefore, the number of input data in each step of determining the maximum value or the minimum value can be reduced, the operation difficulty is further reduced, and the operation cost is saved.
In some possible embodiments, the maximum value or the minimum value may be obtained for the flow data in three or more stages according to actual needs, for example, when the number of the selected delays is large.
Optionally, the generating the first instruction includes:
acquiring grid-connected state information of a power generation system and state information of an electric door positioned on the water supply pipeline;
and when the flow difference value is larger than or equal to the flow threshold value, the power generation system grid-connected state information represents that the power generation system is in a grid-connected state, and the state information of the electric door represents that the valve is not opened in place, generating the first instruction, wherein the first instruction is used for controlling the electric door to open the water supply pipeline.
Considering that when the flow difference value is smaller than the flow threshold value, the flow change may be in a normal water supply flow floating interval; or when the power generation system is not connected to the grid, the power generation system may be in a debugging, overhauling or other state, and the risk of boiler damage caused by water supply may not exist; or, the state information of the electric door is characterized in that when the valve is opened in place, the water supply pipeline is not in a closed state. Therefore, when the flow difference value is larger than or equal to the flow threshold value, the grid-connected state information of the power generation system indicates that the power generation system is in a grid-connected state, and the state information of the electric door indicates that the valve is not opened in place, the first instruction is generated to control the electric door to open the water supply pipeline, and the control rationality can be improved.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. The utility model provides a steam pocket water level protection device, is applied to power generation system, its characterized in that, power generation system includes the steam pocket and is connected the water supply pipe of steam pocket, steam pocket water level protection device includes: the flow transmitter, P logic delay circuits, a first data selector, a second data selector and a logic operation circuit, wherein P is an integer greater than 1;
the flow transmitter is arranged on the water supply pipeline and is respectively connected with the input end of each logic delay circuit in the P logic delay circuits; the output end of each logic delay circuit in the P logic delay circuits is respectively connected with the input end of the first data selector and the input end of the second data selector, and the output end of the first data selector and the output end of the second data selector are respectively connected with the first input end and the second input end of the logic operation circuit.
2. The drum water level protection device according to claim 1, further comprising a third data selector, wherein the number of the flow transmitters is Q, and Q is an integer greater than 1;
the Q flow transmitters are connected to the input end of the third data selector, and the output end of the third data selector is connected to the input end of each logic delay circuit in the P logic delay circuits respectively.
3. The drum water level protection device of claim 1, wherein the first data selector comprises M first sub-data selectors and one second sub-data selector, and the second data selector comprises M third sub-data selectors and one fourth sub-data selector; the P logic delay circuits belong to M preset logic delay circuit groups; the M preset logic delay circuit groups, the M first subdata selectors and the M third subdata selectors correspond to one another one by one;
the output ends of all logic delay circuits in each preset logic delay circuit group are connected with the input end of a corresponding first subdata selector and connected with the input end of a corresponding third subdata selector, the output ends of the M first subdata selectors are connected with the input end of the second subdata selector, the output ends of the M third subdata selectors are connected with the input end of the fourth subdata selector, and the output ends of the second subdata selector and the output end of the fourth subdata selector are respectively connected with the first input end and the second input end of the logic operation circuit; wherein M is an integer greater than 1 and less than Q.
4. The drum water level protection device according to claim 1, wherein the power generation system further comprises a power gate mounted on the water supply pipe, the drum water level protection device comprising a first and gate circuit;
the output end of the logic operation circuit and the electric gate are respectively connected with the first input end and the second input end of the first AND gate circuit, and the output end of the first AND gate circuit is connected with the electric gate.
5. The steam drum water level protection device according to claim 4, further comprising a second AND gate circuit and a NOT gate circuit, wherein the electric gate, the NOT gate circuit and a first input end of the second AND gate circuit are sequentially connected, a second input end of the second AND gate circuit is a grid-connected state information input end of a power generation system, and an output end of the second AND gate circuit is connected with a second input end of the first AND gate circuit.
6. An electrical power generation system comprising a steam drum, a feed water pipe connecting the steam drum, and a steam drum level guard according to any one of claims 1 to 5;
and the flow transmitter of the steam drum water level protection device is arranged on the water supply pipeline.
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| CN202020388149.2U CN211822331U (en) | 2020-03-24 | 2020-03-24 | Steam drum water level protection device and power generation system |
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| CN202020388149.2U CN211822331U (en) | 2020-03-24 | 2020-03-24 | Steam drum water level protection device and power generation system |
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