Boiler redundancy switching device and method

Abstract

The boiler redundancy switching device comprises a boiler A, a boiler B and a controller, steam ports of the boiler A and the boiler B are each connected with an emptying pipeline and a steam pipeline in parallel, the steam pipelines of the boiler A and the boiler B are connected to a steam main in parallel, and the emptying pipelines of the boiler A and the boiler B are correspondingly provided with an emptying adjusting valve A and an emptying adjusting valve B; a pressure transmitter A and a pressure transmitter B are correspondingly arranged behind steam ports of the boiler A and the boiler B, steam pipelines of the boiler A and the boiler B are correspondingly provided with an adjusting valve A and an adjusting valve B, a steam main pipeline is provided with a pressure transmitter C, and the emptying adjusting valve A, the emptying adjusting valve B, the pressure transmitter A, the pressure transmitter B, the adjusting valve A, the adjusting valve B and the pressure transmitter C are all connected with a controller. According to the device, automatic switching of the redundant boilers is achieved, the operation risk caused by improper manual switching operation is avoided, the manual operation intensity is reduced, the automatic control level of the boilers is improved, and the switching operation of the boilers is more stable.

Description

Technical Field

[0001] This invention relates to the field of boiler control technology, specifically to a boiler redundancy switching device and method. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. Steam boilers are an important heat source in industrial production, used for heating process media, insulating equipment pipelines, etc., and are widely used in industrial production such as textiles, printing and dyeing, pharmaceuticals, chemicals, oil refining, and papermaking.

[0003] In industrial production, boilers are typically configured with one boiler in operation and one on standby for redundancy. In existing technology, redundant boilers require manual switching during emergencies or normal periodic switching operations. Manual switching is highly susceptible to errors, leading to overpressure, insufficient pressure, or even steam interruption in the steam system. These issues can range from minor disruptions to stable production operation to serious consequences such as product quality problems and plant shutdowns. Summary of the Invention

[0004] The purpose of this invention is to address the problem that redundant industrial boilers in the prior art cannot be automatically switched, and to provide a boiler redundancy switching device and method that can effectively solve the problem of manual operation switching of redundant boilers, thereby avoiding the operational risks caused by improper manual switching operations.

[0005] This invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a boiler redundancy switching device, comprising boiler A, boiler B, and a controller. Both boiler A and boiler B have steam outlets connected in parallel to vent pipes and steam pipes. The steam pipes of boiler A and boiler B are connected in parallel to a main steam pipe. Vent regulating valve A and vent regulating valve B are correspondingly provided on the vent pipes of boiler A and boiler B. Pressure transmitter A and pressure transmitter B are correspondingly provided after the steam outlets of boiler A and boiler B. Regulating valve A and flow meter A and regulating valve B and flow meter B are correspondingly provided on the steam pipes of boiler A and boiler B. A pressure transmitter C is provided on the main steam pipe. Vent regulating valve A, vent regulating valve B, pressure transmitter A, pressure transmitter B, regulating valve A, regulating valve B, flow meter A, flow meter B, and pressure transmitter C are all connected to the controller.

[0007] In some embodiments, the steam pipe of boiler A is provided with manual valves at the front and rear ends of regulating valve A, and a bypass pipe is connected in parallel at the front and rear ends of the two manual valves, and a manual valve is provided on the bypass pipe; the steam pipe of boiler B is provided with manual valves at the front and rear ends of regulating valve B, and a bypass pipe is connected in parallel at the front and rear ends of the two manual valves, and a manual valve is provided on the bypass pipe.

[0008] In some embodiments, the venting regulating valve A is forcibly switched between manual and automatic modes by a redundant switching program according to switching steps. When the venting regulating valve A is in automatic mode, its opening degree is controlled by the pressure transmitter A and the PID controller A.

[0009] In some embodiments, the venting regulating valve B is forcibly switched between manual and automatic modes by a redundant switching program according to switching steps. When the venting regulating valve B is in automatic mode, its opening degree is controlled by the pressure transmitter B and the PID controller B based on the measured value.

[0010] In some embodiments, the regulating valve A and the regulating valve B are forcibly switched between program control mode and automatic mode by a redundant switching program according to the switching steps. In program control mode, the opening degree of the regulating valve A and the regulating valve B is continuously opened and closed by the program. In automatic mode, the opening degree of the regulating valve A and the regulating valve B is controlled by the PID controller C based on the measured value of the pressure transmitter C.

[0011] In some embodiments, PID controller A, PID controller B, and PID controller C are PID logic blocks within the controller, and the redundancy switching procedure is a sequential control logic block within the controller.

[0012] In some embodiments, both boiler A and boiler B are provided with local control panels, and the two local control panels are connected to the controller.

[0013] In some embodiments, both boiler A and boiler B are equipped with a start button in the controller, and the start button is a software button in the controller.

[0014] In a second aspect, the present invention provides a boiler redundancy switching method, utilizing the boiler redundancy switching device described in the first aspect, comprising the following steps:

[0015] Step 1: Click the boiler switching button to check the start-up conditions.

[0016] 1) Check the parameters of boiler A to determine if it is operating normally;

[0017] 2) Check the parameters of boiler B to determine if it is not running and is ready for ignition;

[0018] Step 2: Start boiler B and bring it to normal operating condition.

[0019] 1) When it is determined that boiler B meets the conditions for ignition, the start button B sends a start command to the local control panel B;

[0020] 2) After receiving the remote start-up command, the local control panel B begins to execute the boiler ignition control program until boiler B is successfully ignited;

[0021] 3) Use the steam pressure transmitter A of boiler A as the set value of PID controller B. If the venting valve B is not in automatic mode, force the venting valve B to switch from manual to automatic mode. At this time, the opening of the venting valve B is adjusted according to the measured value of the pressure transmitter B and through PID controller B.

[0022] Step 3: Perform a switching condition check

[0023] 1) Check the parameters of boiler A and boiler B to determine if they are operating normally;

[0024] 2) Whether the steam pressure measurement value of boiler B is greater than or equal to that of boiler A, and whether the steam output of boiler B is greater than 1% of the steam output of boiler A;

[0025] Step 4: Switch

[0026] 1) Check if the venting regulating valve A is in automatic mode. If not, set it to automatic mode and use the current steam pressure value of boiler A as the set value of PID controller A. At this time, the opening degree of venting regulating valve A is adjusted according to the measured value of pressure transmitter A and through PID controller A.

[0027] 2) Take the flow rate value of steam flow meter A of boiler A as the comparison value of flow meter B of boiler B;

[0028] 3) The program will automatically increase the opening of regulating valve B and automatically decrease the opening of regulating valve A until the valve position is zero.

[0029] 4) When the valve opening of regulating valve A is zero, the program control of regulating valve A and regulating valve B is released; regulating valve A is switched to manual; regulating valve B is switched to automatic, and the opening of regulating valve B is controlled according to the measurement value of pressure transmitter C and through PID controller C.

[0030] Step 5: Check the conditions for successful switch

[0031] 1) The control opening of regulating valve A is zero;

[0032] 2) The flow rate value of flow meter B is greater than or equal to the comparison value;

[0033] 3) The measured steam pressure of boiler B is greater than or equal to the pressure of the main steam pipe;

[0034] Step Six: Boiler A Shutdown Condition Inspection

[0035] 1) Check if boiler B is operating normally;

[0036] 2) Is the steam system pressure stable?

[0037] Step 7: Shut down the furnace and wait for the next switchover.

[0038] 1) Check if boiler A meets the shutdown conditions. If it does, issue a shutdown command through the start button A of boiler A to stop boiler A. This switchover is now complete.

[0039] 2) Wait for the next switch from boiler B to boiler A.

[0040] In some embodiments, in step four, the opening of regulating valve B increases by 1% every 30 seconds until the flow rate of flow meter B is greater than or equal to the comparison value; once the measured value of the detection pressure transmitter C rises, regulating valve A will close by 0.1%, and after 5 seconds, it will be measured again to see if the measured value of the detection pressure transmitter C has risen. If it has risen, it will continue to close by 0.1% until regulating valve A is closed to the zero position.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] This invention effectively solves the problem of manual switching of redundant boiler configurations, realizes automatic switching, avoids the operational risks caused by improper manual switching, reduces the intensity of manual operation, improves production efficiency, enhances the level of automatic boiler control, and makes boiler switching operation more stable. Since the industrial boiler involved in this invention can be applied to industries such as natural gas, oil refining and chemical industry, thermal power generation, and pharmaceuticals, it has the advantages of wide applicability and good application prospects. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0044] Figure 1 This is a schematic diagram of the boiler redundancy switching device in this invention;

[0045] Figure 2 This is a flowchart of the boiler redundancy switching method in this invention.

[0046] The attached diagram shows the markings and corresponding component names:

[0047] 1-Boiler A, 2-Boiler B, 31-Vent regulating valve A, 32-Vent regulating valve B, 41-Pressure transmitter A, 42-Pressure transmitter B, 43-Pressure transmitter C, 51-Regulating valve A, 52-Regulating valve B, 61-Flow meter A, 62-Flow meter B, 71-PID controller A, 72-PID controller B, 73-PID controller C, 81-Local control panel A, 82-Local control panel B, 91-Start button A, 92-Start button B, A1 / A2 / A3 / A4 and B1 / B2 / B3 / B4-Manual valves. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0053] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0054] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0055] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0057] Example 1

[0058] Please refer to Figure 1This application provides a boiler redundancy switching device, including boiler A1, boiler B2, and a controller. Both boiler A1 and boiler B2 have steam outlets connected in parallel to vent pipes and steam pipes. The steam pipes of boiler A1 and boiler B2 are connected in parallel to a main steam pipe. Vent regulating valves A31 and B32 are correspondingly installed on the vent pipes of boiler A1 and boiler B2. Pressure transmitters A41 and B42 are correspondingly installed after the steam outlets of boiler A1 and boiler B2. Regulating valves A51 and B52 are correspondingly installed on the steam pipes of boiler A1 and boiler B2. A pressure transmitter C43 is installed on the main steam pipe. Vent regulating valves A31, B32, A41, B42, A51, B52, and C43 are all connected to the controller via signal lines.

[0059] According to some embodiments of this application, pressure transmitter A41 is used to measure the steam outlet pressure of boiler A1, and the controller adjusts the opening of venting regulating valve A31 in real time based on this pressure value. Pressure transmitter B42 is used to measure the steam outlet pressure of boiler B2, and the controller adjusts the opening of venting regulating valve B32 in real time based on this pressure value. Pressure transmitter C43 is used to measure the pressure in the main steam pipeline, and the controller adjusts the opening of regulating valve A51 and regulating valve B52 in real time based on this pressure value.

[0060] According to some embodiments of this application, a manual valve A1 is provided after the steam outlet of boiler A1, and a manual valve B1 is provided after the steam outlet of boiler B2, so that the total steam output of boiler A and boiler B can be controlled.

[0061] According to some embodiments of this application, the steam pipe of boiler A1 is equipped with manual valves A2 and A3, which are located before and after regulating valve A51, respectively. A bypass pipe is formed at the front and rear ends of manual valves A2 and A3, and a manual valve A4 is installed on the bypass pipe. The steam pipe of boiler B2 is equipped with manual valves B2 and B3, which are located before and after regulating valve B52, respectively. A bypass pipe is formed at the front and rear ends of manual valves B2 and B3, and a manual valve B4 is installed on the bypass pipe. This design facilitates the maintenance or replacement of regulating valves A and B, and allows the steam system pressure to be maintained stable through the bypass pipe and with the aid of manual valves A4 or B4.

[0062] According to some embodiments of this application, flow meters A61 and B62 are respectively installed on the steam pipes of boiler A1 and boiler B2. Flow meter A61 is located at the rear end of manual valve A1, and flow meter B62 is located at the rear end of manual valve B1. Both flow meters A61 and B62 are connected to the controller via signal lines. By setting flow meters A and B, the steam flow rate at the steam outlets of boilers A and B can be measured.

[0063] According to some embodiments of this application, boiler A and boiler B are respectively equipped with level gauges to detect the liquid level parameters of boiler A and boiler B. Specifically, the level gauges of boiler A and boiler B can be installed individually or in multiple units.

[0064] According to some embodiments of this application, the venting regulating valve A31 is forcibly switched between manual and automatic modes by a redundant switching program according to the switching steps. When the venting regulating valve A31 is in automatic mode, its opening degree is controlled by the pressure transmitter A41 and the PID controller A71.

[0065] According to some embodiments of this application, the venting regulating valve B32 is forcibly switched between manual and automatic modes by a redundant switching program according to the switching steps. When the venting regulating valve B32 is in automatic mode, its opening degree is controlled by the pressure transmitter B42 and the PID controller B72.

[0066] According to some embodiments of this application, the regulating valve A51 and the regulating valve B52 are forcibly switched between program control mode and automatic mode by a redundant switching program according to the switching steps. In program control mode, the opening degree of the regulating valve A51 and the regulating valve B52 is continuously opened and closed by the program. In automatic mode, the opening degree of the regulating valve A51 and the regulating valve B52 is controlled by the measured value of the pressure transmitter C43 and the PID controller C73.

[0067] According to some embodiments of this application, the PID controller A71, the PID controller B72 and the PID controller C73 are PID logic blocks within the controller, and the redundancy switching procedure is a sequential control logic block within the controller.

[0068] According to some embodiments of this application, both boiler A1 and boiler B2 are equipped with local control panels, and the two local control panels are connected to the controller. Specifically, the local control panels include local control panel A81 and local control panel B82, wherein local control panel A81 is used for boiler A1, and local control panel B82 is used for boiler B2.

[0069] According to some embodiments of this application, both boiler A1 and boiler B2 are equipped with start buttons, which are software buttons in the controller. Specifically, the start buttons include start button A91 and start button B92, wherein start button A91 is used for boiler A1 and start button B92 is used for boiler B2.

[0070] It should be noted that the controller is a PLC, RTU, DCS, SIS, etc., with program control function.

[0071] Example 2

[0072] Please refer to Figure 2 The boiler redundancy switching method provided in this application embodiment utilizes the boiler redundancy switching device described in Embodiment 1. Taking boiler A1 in operation and boiler B2 out of operation as an example, the method includes the following steps:

[0073] Step 1: Click the boiler switching button to check the start-up conditions.

[0074] 1) Check the liquid level, pressure, and operating status of boiler A1 to determine if it is operating normally;

[0075] 2) Check the liquid level, pressure, and operating status of boiler B2 to determine if it is not running and is ready for ignition.

[0076] Step 2: Start boiler B2 and bring it to normal operating condition.

[0077] 1) When it is determined that boiler B2 meets the conditions for ignition, the start button B92 sends a start command to the local control panel B82;

[0078] 2) After receiving the remote start-up command, the local control panel B82 begins to execute the boiler ignition control procedures such as leak detection, purging, and ignition until the boiler B2 is successfully ignited.

[0079] 3) Use the steam pressure transmitter A41 of boiler A1 at this time as the set value of PID controller B72. If the venting regulating valve B32 is not in automatic mode, force the venting regulating valve B32 to switch from manual to automatic mode. At this time, the opening of the venting regulating valve B32 is adjusted according to the measured value of the pressure transmitter B42 and through PID controller B72.

[0080] Step 3: Perform a switching condition check

[0081] 1) Check the liquid level, pressure, and operating status of boilers A1 and B2 to determine if they are operating normally;

[0082] 2) Whether the measured steam pressure of boiler B2 is greater than or equal to that of boiler A1, and whether the steam output of boiler B2 is greater than 1% of the steam output of boiler A1.

[0083] Step 4: Switch

[0084] 1) Check if the venting regulating valve A31 is in automatic mode. If not, set it to automatic mode and use the current steam pressure value of boiler A1 as the set value of PID controller A71. At this time, the opening of the venting regulating valve A31 is adjusted according to the measured value of the pressure transmitter A41 and through PID controller A71.

[0085] 2) Take the flow rate value of steam flow meter A61 of boiler A1 as the comparison value of flow meter B62 of boiler B2;

[0086] 3) The program will automatically increase the opening of regulating valve B52 and automatically decrease the opening of regulating valve A51 until the valve position is zero.

[0087] 4) When the valve opening of regulating valve A51 is zero, the program control of regulating valve A51 and regulating valve B52 is released; regulating valve A51 is switched to manual; regulating valve B52 is switched to automatic. The opening of regulating valve B52 is controlled according to the measured value of the pressure transmitter C43 and through the PID controller C73.

[0088] Step 5: Check the conditions for successful switch

[0089] 1) The control opening of regulating valve A51 is zero;

[0090] 2) The flow rate value of flow meter B62 is greater than or equal to the comparison value;

[0091] 3) The measured steam pressure of boiler B2 is greater than or equal to the steam main pressure.

[0092] Step Six: Boiler A1 Shutdown Condition Inspection

[0093] 1) Check if boiler B2 is operating normally;

[0094] 2) Whether the steam system pressure is stable.

[0095] Step 7: Shut down the furnace and wait for the next switchover.

[0096] 1) Check if boiler A1 meets the shutdown conditions. If it does, send a shutdown command through the start button A91 of boiler A1 to stop boiler A1. This switchover is now complete.

[0097] 2) Wait for the next switch from boiler B2 to boiler A1.

[0098] According to some embodiments of this application, in step four, the opening of regulating valve B52 increases by 1% every 30 seconds until the flow rate value of flow meter B62 is greater than or equal to the comparison value; once the measured value of detection pressure transmitter C43 rises, regulating valve A51 will close by 0.1%, and after 5 seconds, it will be measured again to see if the measured value of detection pressure transmitter C43 has risen. If it has risen, it will continue to close by 0.1% until regulating valve A51 is closed to the zero position. Of course, it is understood that the opening and closing speeds of the above-mentioned regulating valves B52 and A51 can be appropriately adjusted according to the actual situation on site.

[0099] Similarly, when boiler A1 is shut down and boiler B2 is running, the method for switching from boiler B2 to boiler A1 can be implemented with reference to the above description, and will not be repeated here.

[0100] The embodiments of this application can effectively solve the problem of manual operation switching of redundant boilers, realize automatic switching, avoid the operational risks caused by improper manual switching operations, reduce the intensity of manual operation, improve production efficiency, improve the level of automatic boiler control, and make boiler switching operation more stable.

[0101] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A boiler redundancy switching device, comprising boiler A, boiler B, and a controller, characterized in that, Both boiler A and boiler B have parallel vent pipes and steam pipes at their steam outlets. The steam pipes of boiler A and boiler B are connected in parallel to the main steam pipe. Vent regulating valve A and vent regulating valve B are correspondingly installed on the vent pipes of boiler A and boiler B. Pressure transmitter A and pressure transmitter B are correspondingly installed after the steam outlets of boiler A and boiler B. Regulating valve A and flow meter A and regulating valve B and flow meter B are correspondingly installed on the steam pipes of boiler A and boiler B. Pressure transmitter C is installed on the main steam pipe. Vent regulating valve A, vent regulating valve B, pressure transmitter A, pressure transmitter B, regulating valve A, regulating valve B, flow meter A, flow meter B, and pressure transmitter C are all connected to the controller.

2. The boiler redundancy switching device according to claim 1, characterized in that, The steam pipe of boiler A is equipped with manual valves at the front and rear ends of regulating valve A, and a bypass pipe is connected in parallel at the front and rear ends of the two manual valves, and a manual valve is installed on the bypass pipe; the steam pipe of boiler B is equipped with manual valves at the front and rear ends of regulating valve B, and a bypass pipe is connected in parallel at the front and rear ends of the two manual valves, and a manual valve is installed on the bypass pipe.

3. The boiler redundancy switching device according to claim 1, characterized in that, The venting regulating valve A is forcibly switched between manual and automatic modes by a redundant switching program according to the switching steps. When the venting regulating valve A is in automatic mode, its opening degree is controlled by the pressure transmitter A and the PID controller A.

4. The boiler redundancy switching device according to claim 3, characterized in that, The venting regulating valve B is forcibly switched between manual and automatic modes by a redundant switching program according to the switching steps. When the venting regulating valve B is in automatic mode, its opening degree is controlled by the pressure transmitter B and the PID controller B.

5. The boiler redundancy switching device according to claim 4, characterized in that, The regulating valves A and B are forcibly switched between program control mode and automatic mode by a redundant switching program according to the switching steps. In program control mode, the opening degree of the regulating valves A and B is continuously opened and closed by the program. In automatic mode, the opening degree of the regulating valves A and B is controlled by the measured value of the pressure transmitter C and the PID controller C.

6. The boiler redundancy switching device according to claim 5, characterized in that, The PID controller A, PID controller B, and PID controller C are PID logic blocks within the controller, and the redundancy switching procedure is a sequential control logic block within the controller.

7. The boiler redundancy switching device according to any one of claims 1-6, characterized in that, Both boiler A and boiler B are equipped with local control panels, and the two local control panels are connected to the controller.

8. The boiler redundancy switching device according to any one of claims 1-6, characterized in that, Both boiler A and boiler B are equipped with a start button in the controller, which is a software button in the controller.

9. A boiler redundancy switching method, utilizing the boiler redundancy switching device according to claims 1-8, characterized in that, Includes the following steps: Step 1: Click the boiler switching button to check the start-up conditions. 1) Check the parameters of boiler A to determine if it is operating normally; 2) Check the parameters of boiler B to determine if it is not running and is ready for ignition; Step 2: Start boiler B and bring it to normal operating condition. 1) When it is determined that boiler B meets the conditions for ignition, the start button B sends a start command to the local control panel B; 2) After receiving the remote start-up command, the local control panel B begins to execute the boiler ignition control program until boiler B is successfully ignited; 3) Use the steam pressure transmitter A of boiler A as the set value of PID controller B. If the venting valve B is not in automatic mode, force the venting valve B to switch from manual to automatic mode. At this time, the opening of the venting valve B is adjusted according to the measured value of the pressure transmitter B and through PID controller B. Step 3: Perform a switching condition check 1) Check the parameters of boiler A and boiler B to determine if they are operating normally; 2) Whether the steam pressure measurement value of boiler B is greater than or equal to that of boiler A, and whether the steam output of boiler B is greater than 1% of the steam output of boiler A; Step 4: Switch 1) Check if the venting regulating valve A is in automatic mode. If not, set it to automatic mode and use the current steam pressure value of boiler A as the set value of PID controller A. At this time, the opening degree of venting regulating valve A is adjusted according to the measured value of pressure transmitter A and through PID controller A. 2) Take the flow rate value of steam flow meter A of boiler A as the comparison value of flow meter B of boiler B; 3) The program will automatically increase the opening of regulating valve B and automatically decrease the opening of regulating valve A until the valve position is zero. 4) When the valve opening of regulating valve A is zero, the program control of regulating valve A and regulating valve B is released; regulating valve A is switched to manual; regulating valve B is switched to automatic, and the opening of regulating valve B is controlled according to the measurement value of pressure transmitter C and through PID controller C. Step 5: Check the conditions for successful switch 1) The control opening of regulating valve A is zero; 2) The flow rate value of flow meter B is greater than or equal to the comparison value; 3) The measured steam pressure of boiler B is greater than or equal to the pressure of the main steam pipe; Step Six: Boiler A Shutdown Condition Inspection 1) Check if boiler B is operating normally; 2) Is the steam system pressure stable? Step 7: Shut down the furnace and wait for the next switchover. 1) Check if boiler A meets the shutdown conditions. If it does, issue a shutdown command through the start button A of boiler A to stop boiler A. This switchover is now complete. 2) Wait for the next switch from boiler B to boiler A.

10. The boiler redundancy switching method according to claim 9, characterized in that, In step four, the opening of regulating valve B increases by 1% every 30 seconds until the flow rate of flow meter B is greater than or equal to the comparison value. Once the measured value of pressure transmitter C rises, regulating valve A will close by 0.1%. After 5 seconds, it will be measured again to see if the measured value of pressure transmitter C has risen. If it has risen, it will continue to close by 0.1% until regulating valve A is closed to the zero position.

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