CN212989941U - Steam soot blowing control circuit based on DCS control system - Google Patents
Steam soot blowing control circuit based on DCS control system Download PDFInfo
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- CN212989941U CN212989941U CN202021541315.4U CN202021541315U CN212989941U CN 212989941 U CN212989941 U CN 212989941U CN 202021541315 U CN202021541315 U CN 202021541315U CN 212989941 U CN212989941 U CN 212989941U
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Abstract
The utility model discloses a steam blows grey control circuit based on DCS control system, including on-the-spot manual control bus, promptly return control line, secondary circuit power zero line and secondary circuit power live wire. The field manual control bus is electrically connected with a zero line of the secondary loop power supply, and the tail end of the emergency return control line is arranged on the field manual control bus. The steam soot blowing system is transformed through the circuit, the steam soot blowing is transformed into a DCS control system through PLC control, and soot blowing is carried out on different positions in a hearth through controlling the soot blower. The problems of unopened PLC software configuration of the steam soot blowing system, difficulty in maintaining and modifying logic configuration and pictures, low steam pressure control precision, large system pressure fluctuation, high system equipment failure rate and inconvenience in system operation and operation monitoring are fundamentally solved, and the investment of manpower and material resources is effectively reduced. And the control precision of the soot blower in the hearth during soot blowing is improved, and the aims of saving energy, reducing consumption and improving the boiler efficiency are fulfilled.
Description
Technical Field
The utility model relates to a power plant's furnace blows grey technical field, especially relates to a steam blows grey control circuit based on DCS control system.
Background
At present, most of steam soot blowing control systems are controlled by a PLC (programmable logic controller), and are communicated with an upper computer through an MODUBUS communication protocol, the upper computer is used as a human-computer interface and an operation station, and the network structure is simple and is not redundant.
The steam pressure regulating valve of the soot blowing system is controlled in the PLC, and compared with the DCS, the steam pressure regulating valve is low in control precision, so that the pressure fluctuation is large, the safety valve acts, and the service lives of a soot blower and a pressure pipeline are shortened.
The network structure is simple and not redundant, if the soot blowing program is in operation and the network fails or the upper computer crashes, the on-site soot blower will be out of control at the moment, and even the soot blower is possibly left in the hearth to be burned and melted or the soot blower blows soot for a long time to cause the accident of tube explosion.
The PLC software configuration of the steam soot blowing system is not opened, and the steam pressure control precision is low, the system pressure fluctuation is large, so that the system equipment failure rate is high, the logic configuration and the picture maintenance and modification are difficult, and the system operation and the operation monitoring are inconvenient.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a steam blows grey control circuit based on DCS control system blows grey steam and blows grey to change into DCS control from PLC control.
In order to achieve the purpose, the utility model is realized by the following technical scheme:
a steam soot blowing control circuit based on a DCS control system comprises a field manual control bus, an emergency return control line, a secondary loop power supply zero line and a secondary loop power supply live line. The field manual control bus is electrically connected with a zero line of the secondary loop power supply, and the tail end of the emergency return control line is arranged on the field manual control bus.
And a field starting key, a control switch, a soot blower front limit switch, a forward contact switch, a soot blower forward contactor and a thermal relay are respectively arranged on the field manual control bus. The left end of the field starting key is electrically connected with a field manual control line. The left end of the control switch is respectively and electrically connected with the right end of the field starting key and the emergency return control line, and a starting pulse line is connected between the field starting key and the control switch. The right end of the soot blower front limit switch is electrically connected with the left end of the forward contact switch, the right end of the forward contact switch is electrically connected with the input end of the soot blower forward contactor, the output end of the soot blower forward contactor is electrically connected with the left end of the thermal relay, and the right end of the thermal relay is electrically connected with a secondary circuit power supply zero line.
The emergency return control line is respectively provided with a control switch, a soot blower rear limit switch, a backward contact switch and a soot blower backward contactor. The right end of the control switch is electrically connected with the left end of the soot blower front limit switch and the left end of the soot blower rear limit switch respectively, the right end of the soot blower rear limit switch is electrically connected with the left end of the retreating contact switch, the right end of the retreating contact switch is electrically connected with the input end of the soot blower retreating contactor, and the output end of the soot blower retreating contactor is electrically connected between the output end of the soot blower advancing contactor and the left end of the thermal relay.
And a communication switch is arranged between the field manual control bus and the emergency return control line, one end of the communication switch is electrically connected between the control switch and the soot blower front limit switch, and the other end of the communication switch is electrically connected between the soot blower rear limit switch and the backward contact switch.
The secondary loop power supply live wire is connected with a soot blower overload signal wire, and the third terminal of the thermal relay is electrically connected between the secondary loop power supply live wire and the soot blower overload signal wire.
Compared with the prior art, the utility model has the advantages of it is following: the steam soot blowing system is transformed through the circuit, the steam soot blowing is transformed into a DCS control system through PLC control, and soot blowing is carried out on different positions in a hearth through controlling the soot blower. The problems of unopened PLC software configuration of the steam soot blowing system, difficulty in maintaining and modifying logic configuration and pictures, low steam pressure control precision, large system pressure fluctuation, high system equipment failure rate and inconvenience in system operation and operation monitoring are fundamentally solved, and the investment of manpower and material resources is effectively reduced. And the control precision of the soot blower in the hearth during soot blowing is improved, and the aims of saving energy, reducing consumption and improving the boiler efficiency are fulfilled.
More preferably: the end of the emergency return control line refers to the output end of the sootblower backup contactor.
By adopting the technical scheme, the soot blower backward contactor and the soot blower forward contactor are connected in parallel, the purpose of controlling the forward soot blowing and backward soot blowing of the same soot blower to independently act is achieved, and the soot blowing precision is improved.
More preferably: the control switch is arranged on the soot blower and is used for controlling the soot blower to perform forward soot blowing and backward soot blowing.
By adopting the technical scheme, the soot blower is controlled by the control switch to independently perform forward soot blowing and backward soot blowing respectively, so that the failure rate of equipment is reduced, and the control picture is clearly visible and easy to maintain on a system interface.
More preferably: the thermal relay is selected from the thermal relays which are reset.
By adopting the technical scheme, the reset thermal relay can be normally used in the circuit.
The method is further optimized as follows: the starting pulse line is used for carrying a starting pulse signal sent by the controller.
By adopting the technical scheme, after the starting pulse signal is sent by the controller, the starting pulse signal is transmitted to the control switch through the starting pulse signal wire, the control switch further controls the actions of the soot blower front limit switch, the forward contact switch and the soot blower forward contactor, and finally controls the soot blower to perform forward soot blowing action, so that the aim of accurate control is fulfilled, and the condition that the soot blower is frequently damaged is avoided.
The method is further optimized as follows: a forward switch is arranged on the soot blower forward signal wire, a backward switch is arranged on the soot blower backward signal wire, and the tail end of the forward switch and the tail end of the backward switch are both electrically connected with a secondary loop power live wire.
By adopting the technical scheme, the whole circuit forms a complete loop, and the purpose of controlling the soot blower to perform steam soot blowing in the hearth is achieved.
Drawings
FIG. 1 is a circuit control diagram of the present embodiment;
fig. 2 is a monitoring operation screen diagram of the DCS system of the present embodiment.
Reference numerals: a3-field manual control bus; a2 — emergency return control line; a1-secondary loop power supply live wire; n-secondary loop power supply zero line; START-field START button; E-X-soot blower back signal line; RR-2-Back switch; G-X-soot blower forward signal line; an RF-3-go switch; LSF-soot blower front limit switch; LSR-soot blower back limit switch; an RF-sootblower forward contactor; RF-1-rear contact switch; an RF-2-on switch; RR-soot blower back contact; RR-1-Forward contact switch; GK-control switch; an RJ-thermal relay; D-X-start pulse line; an H-X-soot blower overload signal line; 90-auxiliary steam device; 901-auxiliary steam pipeline; 902-an auxiliary manual valve; 903-an auxiliary electric valve; 904-auxiliary flow valve; 91-a primary steam unit; 911-main steam electric valve; 92-denitration soot blowing pipeline; 93-auxiliary steam header steam inlet pipe; 94-left diversion valve, 95-right diversion valve and 96-air preheater soot blowing diversion valve.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and 2.
A steam soot blowing control circuit based on a DCS control system is used for controlling a soot blower to steam soot-blow a plurality of batons inside a hearth as shown in figure 1, and comprises a field manual control bus A3, an emergency return control line A2, a secondary loop power supply zero line N and a secondary loop power supply live line A1 as shown in figure 1. The on-site manual control bus is electrically connected with a zero line N of a secondary loop power supply, and the tail end of an emergency return control line A2 is arranged on the on-site manual control bus A3.
The field manual control bus A3 is respectively provided with a field starting key START, a control switch GK, a soot blower front limit switch LSF, a forward contact switch RR-1, a soot blower forward contactor RF and a thermal relay RJ. The left end of the field START button START is electrically connected with a field manual control line. The left end of the control switch GK is respectively and electrically connected with the right end of the field START key START and the emergency return control line A2, and a START pulse line D-X is connected between the field START key START and the control switch GK. The right end of the soot blower front limit switch LSF is electrically connected with the left end of the forward contact switch RR-1, the right end of the forward contact switch RR-1 is electrically connected with the input end of the soot blower forward contactor RF, the output end of the soot blower forward contactor RF is electrically connected with the left end of the thermorelay RJ, and the right end of the thermorelay RJ is electrically connected with the zero line of the secondary loop power supply.
The emergency return control line A2 is respectively provided with a control switch GK, a soot blower rear limit switch LSR, a backward contact switch RF-1 and a soot blower backward contactor RR. The right end of the control switch GK is electrically connected with the left end of the soot blower front limit switch LSF and the left end of the soot blower rear limit switch LSR respectively, the right end of the soot blower rear limit switch LSR is electrically connected with the left end of the rear return contact switch RF-1, the right end of the rear return contact switch RF-1 is electrically connected with the input end of the soot blower backward contactor RR, and the output end of the soot blower backward contactor RR is electrically connected between the output end of the soot blower forward contactor RF and the left end of the thermal relay RJ.
A communication switch RF-2 is arranged between the field manual control bus A3 and the emergency return control line A2, one end of the communication switch RF-2 is electrically connected between the control switch GK and the soot blower front limit switch LSF, and the other end of the communication switch RF-2 is electrically connected between the soot blower rear limit switch LSR and the backward contact switch RF-1.
A soot blower overload signal line H-X is connected to the secondary circuit power supply live wire A1, and a third terminal of the thermal relay RJ is electrically connected between the secondary circuit power supply live wire A1 and the soot blower overload signal line H-X.
Specifically, in this embodiment, the end of the emergency return control line a2 refers to the output end of the soot blower backward contactor RR, and the soot blower backward contactor RR is connected in parallel with the soot blower forward contactor RF, so as to achieve the purpose of controlling the forward soot blowing and the backward soot blowing of the same soot blower to independently operate, and improve the soot blowing accuracy.
Specifically, in the embodiment, the control switch GK is arranged on the soot blower, and is used for controlling the soot blower to perform forward soot blowing and backward soot blowing, and the control switch GK is used for controlling the soot blower to perform forward soot blowing and backward soot blowing respectively and independently, so that the equipment failure rate is reduced, and the control picture is clearly visible and easy to maintain on the system interface.
Specifically, in this embodiment, the thermal relay RJ selects the thermal relay RJ that has reset, and the thermal relay RJ after resetting can normally be used in the circuit.
Specifically, in this embodiment, the start pulse line D-X is used to carry a start pulse signal sent by the controller, and after the start pulse signal is sent by the controller, the start pulse signal is transmitted to the control switch GK through the start pulse signal line, and the control switch GK further controls the actions of the soot blower front limit switch LSF, the forward contact switch RR-1, and the soot blower forward contactor RF, and finally controls the soot blower to perform forward soot blowing, so as to achieve the purpose of accurate control and avoid frequent damage of the soot blower. It should be noted that the controller in the present application is a controller in a system, and belongs to a conventional controller, and does not belong to the scope of protection of the present application, and only the technology of the present application is described in an auxiliary way for facilitating understanding of those skilled in the art, so that a detailed description of the controller is not needed.
Specifically, in the embodiment, a forward switch RF-3 is arranged on a forward signal line G-X of the soot blower, a backward switch RR-2 is arranged on a backward signal line E-X of the soot blower, and the tail end of the forward switch RF-3 and the tail end of the backward switch RR-2 are electrically connected with a secondary loop power supply live wire A1, so that the whole circuit forms a complete loop, and the purpose of controlling the soot blower to perform steam soot blowing in a hearth is achieved.
The following describes the control circuit and the control system in detail by taking the simultaneous soot blowing of the left side and the right side in the furnace as an example, specifically as follows:
as shown in fig. 2, a main steam device 91 and a control button are respectively arranged on the DCS control screen, the main steam device 91 comprises a main steam valve and a main steam pipeline, the main steam pipeline is respectively provided with an auxiliary steam device 90 and a denitration soot blowing pipeline 92, the auxiliary steam pipeline 901 is used for performing steam soot blowing in a furnace chamber of a boiler, and the denitration soot blowing pipeline 92 is used for performing steam soot blowing on the denitration device. The auxiliary steam device 90 comprises an auxiliary steam pipeline 901, an auxiliary electric valve 903, an auxiliary manual valve 902 and an auxiliary flow valve 904, wherein the auxiliary manual valve 902, the auxiliary steam pipeline 901 and the auxiliary flow valve 904 are respectively and sequentially installed on the auxiliary steam pipeline 901, and steam is provided in a hearth.
The DCS control picture is also provided with an auxiliary steam header steam inlet pipe 93, a left side flow guide valve 94, a right side flow guide valve 95 and an air preheater soot blowing flow guide valve 96 respectively, wherein the auxiliary steam header steam inlet pipe 93 is used for introducing steam to the auxiliary steam header, the left side flow guide valve 94 is used for discharging condensate on the left side in the hearth, the right side flow guide valve 95 is used for discharging condensate on the right side in the hearth, and the air preheater soot blowing flow guide valve 96 is used for discharging condensate when the air preheater is soot-blown.
A, B, C, D, E layers of soot blowers are arranged in a hearth as an example, wherein each layer of A, B, C, D layers is provided with 14 soot blowers, the layer E is provided with 4 soot blowers, the layer E is sequentially numbered by A1-A14, B1-B14, C1-C14, D1-D14 and E1-E14 respectively, and control buttons comprise total soot blowing sequential control, a main steam valve of a body, a reburning gas source valve, single blowing, layer A single blowing, layer B single blowing, layer C single blowing, layer D single blowing, layer E single blowing, layer A opposite blowing, layer B opposite blowing, layer C opposite blowing, layer D opposite blowing, layer E opposite blowing, layer A starting permission, layer B starting permission, layer C starting permission, layer D starting permission, layer E starting permission, long soot blowing single blowing, long soot blower opposite blowing buttons, left emergency return buttons, retreat buttons, emergency return buttons, right emergency return buttons and the like, and display lamps are arranged beside the forward and backward buttons to display the current working state of the soot blower. It should be noted that, on the DCS screen designed in this application, if the soot blower enters the operating state, soot blowing is performed in that manner, the corresponding button will appear in color, and the color of the DCS screen is red in this application, or may be set to other colors.
A soot blowing process:
please refer to fig. 1 and fig. 2, a soot blowing mode of layer a opposite blowing is selected on a monitoring operation picture of the DCS, a field manual control bus a3 is electrified after being connected to a power supply, a circuit control chart is arranged on a circuit operation picture of the DCS, a field START key START is clicked on the circuit operation picture of the DCS, a control switch GK is closed, a soot blower front limit switch LSF, a forward contact switch RR-1 and a soot blower forward contactor RF are all switched on, soot blowers on the left side and the right side respectively START to rotate in a counterclockwise direction and move forward to a central position in a furnace chamber simultaneously, steam is sprayed into the furnace chamber to perform soot blowing, and the soot blowing is displayed on the monitoring operation picture of the DCS, and a corresponding forward state is displayed by a light. It should be noted that the DCS monitoring operation screen also displays the left forward time, the left backward time, the right forward time, the right backward time, the specific number of layers of steam soot blowing, and which specific soot blower is performing soot blowing.
When the soot blowing time is over, the soot blower rear limit switch LSR is closed, the soot blower forward contactor RF and the soot blower backward contact switch RF-1 are electrified, the soot blower starts to rotate in a clockwise mode to backward, soot blowing is carried out during the backward process, and the purpose of thoroughly cleaning the hearth is achieved. During the soot blowing process, condensate after soot blowing is discharged through the left diversion valve 94 and the right diversion valve 95 respectively. The soot blowing process has the advantages that the soot blower is operated on the monitoring operation picture of the DCS and the circuit operation picture of the DCS, the soot blowing process is simple and convenient, the soot blowing progress degree can be known through the time, the state and the steam flow displayed on the monitoring operation picture of the DCS, the circuit operation picture of the DCS realizes accurate operation, the control efficiency is improved, and the phenomenon that equipment is damaged due to misoperation or difficult control of the steam flow is directly avoided.
To sum up, reform transform steam soot blower system through this circuit, control the steam soot blower by PLC and reform transform into DCS control system, blow the ash through realizing blowing the ash to different positions in the furnace to control the soot blower. The problems of unopened PLC software configuration of the steam soot blowing system, difficulty in maintaining and modifying logic configuration and pictures, low steam pressure control precision, large system pressure fluctuation, high system equipment failure rate and inconvenience in system operation and operation monitoring are fundamentally solved, and the investment of manpower and material resources is effectively reduced. And the control precision of the soot blower in the hearth during soot blowing is improved, and the aims of saving energy, reducing consumption and improving the boiler efficiency are fulfilled.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the present invention.
Claims (6)
1. The utility model provides a steam blows grey control circuit based on DCS control system which characterized in that: the emergency return control system comprises a field manual control bus, an emergency return control line, a secondary loop power supply zero line and a secondary loop power supply live line; the field manual control bus is electrically connected with the zero line of the secondary loop power supply, and the tail end of the emergency return control line is arranged on the field manual control bus;
the field manual control bus is respectively provided with a field starting key, a control switch, a soot blower front limit switch, a forward contact switch, a soot blower forward contactor and a thermal relay; the left end of the field starting key is electrically connected with the field manual control line; the left end of the control switch is respectively and electrically connected with the right end of the field starting key and the emergency return control line, and a starting pulse line is connected between the field starting key and the control switch; the right end of the soot blower front limit switch is electrically connected with the left end of the forward contact switch, the right end of the forward contact switch is electrically connected with the input end of the soot blower forward contactor, the output end of the soot blower forward contactor is electrically connected with the left end of the thermal relay, and the right end of the thermal relay is electrically connected with the zero line of the secondary loop power supply;
a control switch, a soot blower rear limit switch, a backward contact switch and a soot blower backward contactor are respectively arranged on the emergency return control line; the right end of the control switch is respectively and electrically connected with the left end of the soot blower front limit switch and the left end of the soot blower rear limit switch, the right end of the soot blower rear limit switch is electrically connected with the left end of the backward contact switch, the right end of the backward contact switch is electrically connected with the input end of the soot blower backward contactor, and the output end of the soot blower backward contactor is electrically connected between the output end of the soot blower forward contactor and the left end of the thermal relay;
a communication switch is arranged between the field manual control bus and the emergency return control line, one end of the communication switch is electrically connected between the control switch and the soot blower front limit switch, and the other end of the communication switch is electrically connected between the soot blower rear limit switch and the backward contact switch;
and a soot blower overload signal line is connected to the secondary loop power supply live wire, and a third terminal of the thermal relay is electrically connected between the secondary loop power supply live wire and the soot blower overload signal line.
2. The DCS control system-based steam soot blowing control circuit of claim 1, wherein: the tail end of the emergency return control line refers to an output end of the soot blower retreating contactor.
3. The DCS control system-based steam soot blowing control circuit of claim 1, wherein: the control switch is arranged on the soot blower and is used for controlling the soot blower to perform forward soot blowing and backward soot blowing.
4. The DCS control system-based steam soot blowing control circuit of claim 1, wherein: the thermal relay is selected from the thermal relays which are reset.
5. The DCS control system-based steam soot blowing control circuit of claim 1, wherein: the starting pulse line is used for carrying a starting pulse signal sent by the controller.
6. The DCS control system-based steam soot blowing control circuit of claim 1, wherein: a forward switch is arranged on the soot blower forward signal wire, a backward switch is arranged on the soot blower backward signal wire, and the tail end of the forward switch and the tail end of the backward switch are both electrically connected with the secondary loop power live wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021541315.4U CN212989941U (en) | 2020-07-29 | 2020-07-29 | Steam soot blowing control circuit based on DCS control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021541315.4U CN212989941U (en) | 2020-07-29 | 2020-07-29 | Steam soot blowing control circuit based on DCS control system |
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| Publication Number | Publication Date |
|---|---|
| CN212989941U true CN212989941U (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021541315.4U Active CN212989941U (en) | 2020-07-29 | 2020-07-29 | Steam soot blowing control circuit based on DCS control system |
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| Country | Link |
|---|---|
| CN (1) | CN212989941U (en) |
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2020
- 2020-07-29 CN CN202021541315.4U patent/CN212989941U/en active Active
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