A combustion system and its control method

Abstract

The present application provides a combustion system and a control method thereof, relating to the technical field of gas combustion control. The combustion system includes a control system, a gas pipe, an auxiliary combustion gas pipe, a plurality of combustion components, a premixing gas pipe and a purging pipe. The gas pipe and the auxiliary combustion gas pipe are respectively communicated with the premixing gas pipe. The plurality of combustion components are arranged at intervals along the premixing gas pipe. Each combustion component includes a burner, a first pipe and a second pipe which are independently arranged and respectively communicated with the burner and the premixing gas pipe. The burner has an ignition mechanism and a flame detector probe. The burner can be selectively communicated with a purging fan through a purging solenoid valve. The purging fan is used to provide purging gas to the burner. The first pipe is provided with a first solenoid valve, and the second pipe is provided with a second solenoid valve. The control system is electrically connected to the ignition mechanism, the flame detector probe, the first solenoid valve, the second solenoid valve, the purging solenoid valve and the purging fan respectively to control the operating states of each component, and its operation is simple and convenient and the stable combustion of a plurality of burners is realized.

Description

Technical Field

[0001] This application relates to the technical field of gas combustion control. Specifically, it relates to a combustion system and its control method. Background Art

[0002] A combustion system is a general term for devices that spray fuel and air in a certain manner and mix them for combustion. Currently, the control methods for burners mainly target the control of individual burners, which can achieve better control of individual burners. However, there are few studies on the setting and control methods of combustion systems with multiple burners. How to achieve stable combustion of multiple burners in a combustion system is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a combustion system and its control method, which can improve at least one of the above technical problems.

[0004] In a first aspect, the embodiments of this application provide a combustion system, which includes a control system, a gas pipeline, a combustion-supporting gas pipeline, a plurality of combustion components, a premixing gas pipeline, and a purging pipeline.

[0005] The gas pipeline and the combustion-supporting gas pipeline are respectively connected to the premixing gas pipeline, and the plurality of combustion components are arranged at intervals along the flow direction of the gas flow in the premixing gas pipeline.

[0006] Each combustion component includes: a burner, and a first pipeline and a second pipeline that are independently arranged and respectively connected to the burner and the premixing gas pipeline.

[0007] The burner has an ignition mechanism for ignition and a flame detector for detecting the flame. The burner can be selectively connected to a purging fan through a purging solenoid valve, and the purging fan is used to provide purging gas to the burner; the first pipeline is provided with a first solenoid valve for controlling its on / off, and the second pipeline is provided with a second solenoid valve for controlling its on / off.

[0008] The control system is electrically connected to the ignition mechanism, the flame detector, the first solenoid valve, the second solenoid valve, the purging solenoid valve, and the purging fan respectively to control the operating states of each component.

[0009] In the above implementation process, by electrically connecting the control system to the ignition mechanism, the flame detector probe, the first solenoid valve, the second solenoid valve, and the purge solenoid valve respectively, remote non-contact control of the operating states of the above components can be achieved, and the operation is simpler. At the same time, the multiple combustion components are independently arranged and spaced along the flow direction of the air flow in the premixing gas pipe, and the specific setting mode of each combustion component facilitates subsequent combustion control. At the same time, a specific number or all of the combustion components can be selected for combustion according to actual needs. And through the setting of the first pipe and the second pipe, by using the on-off of the first pipe and the second pipe, the flow rate of the premixed air flow input to the burner can be adjusted, realizing the adjustment of the small fire combustion and the large fire combustion of the burner, with simple and convenient operation, and realizing the stable combustion of multiple burners.

[0010] In a possible implementation, the gas pipe is provided with a pressure reducing valve and a pressure monitoring mechanism for monitoring the actual pressure in the gas pipe. The pressure monitoring mechanism and the pressure reducing valve are respectively electrically connected to the control system, and the control system controls the opening degree of the pressure reducing valve to adjust the pressure in the gas pipe.

[0011] In the above implementation process, the control system can, according to the gas pipe pressure signal fed back by the pressure monitoring mechanism, adjust the opening degree of the pressure reducing valve to ensure the constancy of the pressure.

[0012] In a possible implementation, the purge fans correspond to the combustion components one by one. Each burner is communicated with the corresponding purge fan through a purge pipe, and each purge pipe is provided with a purge solenoid valve.

[0013] In the above implementation process, independent purge of each burner is realized. At the same time, compared with the method of supplying air to multiple burners by one purge fan, the travel distance between the purge fan and the burner is shortened, ensuring good purge effect and avoiding unnecessary wind loss.

[0014] In a second aspect, the embodiment of the present application provides a control method for the combustion system in the first aspect, which includes the following steps:

[0015] Along the flow direction of the air flow in the premixing gas pipe, the burners in the combustion components to be ignited are sequentially ignited and the flame is detected.

[0016] Among them, the steps of igniting and detecting the flame of each burner include:

[0017] The control system controls the first solenoid valve to open, then controls the ignition mechanism to ignite the burner, and controls the flame detector probe to continuously detect the flame. If the flame detector probe detects a flame, it is determined that the ignition is successful. After terminating the ignition and burning for 20 - 50 s, the second solenoid valve is opened so that the first pipe and the second pipe supply gas to the burner simultaneously. After continuing to burn for 20 - 50 s, the ignition and flame detection of the burner in the next combustion component are carried out until the ignition of all burners is completed.

[0018] In the above implementation process, by using the method of igniting in sequence along the flow direction of the gas flow in the premixed gas pipe, the safety during ignition can be ensured, and some adverse effects that may be caused by the previously successfully ignited burner can be avoided. At the same time, first use a small flame to ignite, and after successful ignition, burn for 20 - 50 s until it reaches stable combustion, and then open the second solenoid valve to avoid the small flame from going out due to unstable combustion and directly opening the second solenoid valve. After opening the second solenoid valve, at this time, the first pipe and the second pipe supply gas to the burner simultaneously to achieve the large - flame combustion of the burner. At this time, continue to burn for 20 - 50 s. After ensuring stable large - flame combustion, then ignite the burner in the next combustion assembly to prevent the situation where the burner goes out but the next burner is ignited, and avoid the occurrence of safety accidents. At the same time, with the above - mentioned setting method, the combustion power of the burner is adjusted and ensured by using the change of the premixed gas flow rate, and by using the change from small flame to large flame, it is ensured that the burner can burn stably and avoid wasting the premixed gas, and finally the stable combustion of multiple burners is achieved.

[0019] In a possible implementation, before the burner in each combustion assembly is ignited and the flame is detected, the control method further includes: the control system controls the purge solenoid valve to open to purge the burner, and after purging is completed, the purge solenoid valve is closed.

[0020] In the above implementation process, by using the purge setting, the residual premixed gas that may exist in the burner is prevented, further improving the safety of ignition.

[0021] In a possible implementation, in the steps of igniting each burner and detecting the flame, if the flame detection probe does not detect a flame, it is determined that the ignition fails, and the control system controls the ignition component to re - ignite. If the ignition fails three times in a row, the ignition is terminated and the first solenoid valve and the second solenoid valve corresponding to all combustion assemblies are closed.

[0022] By using the above - mentioned setting, the safety of the system operation is ensured, and it also complies with relevant national standards.

[0023] In a possible implementation, during the operation of the combustion system, if the flame detection signal of the flame detection probe corresponding to a burner disappears, the control system controls the first solenoid valve and the second solenoid valve corresponding to the burner with the disappeared flame detection signal, and the second solenoid valves of the remaining combustion assemblies to be closed, and opens the purge solenoid valve corresponding to the burner with the disappeared flame detection signal for purging. After purging is completed, the purge solenoid valve is closed, and the burner with the disappeared flame detection signal is re - ignited and the flame is detected. If the flame detection probe detects a flame, the second solenoid valves corresponding to all combustion assemblies are opened.

[0024] In the above implementation process, the burner with the flame detection signal disappearing can be safely and effectively ignited by using the above setting method, and the pre-gas can stably burn in the burner without affecting the operation of the entire combustion system.

[0025] Optionally, in the step of re-igniting the burner with the flame detection signal disappearing and performing flame detection, if the ignition fails three times in a row, the control system terminates the ignition and closes the first solenoid valves corresponding to all combustion components.

[0026] In the above implementation process, using the above settings ensures the safety of the combustion system and prevents safety accidents from occurring.

[0027] In a possible implementation, during the operation of the combustion system, if the flame detection signals of the flame detection probes corresponding to two or more burners disappear, the control system controls the first solenoid valves and the second solenoid valves corresponding to all combustion components to close.

[0028] In the above implementation process, according to the number of disappearing flame detection signals, the operating state of the combustion system can be simply and quickly reflected. When the flame detection signals of two or more burners disappear, the first solenoid valves and the second solenoid valves corresponding to all combustion components are closed, effectively preventing safety accidents from occurring.

[0029] In a possible implementation, after the operation of the combustion system ends, the control system controls the first solenoid valves and the second solenoid valves corresponding to all combustion components to close, opens the purge solenoid valve and purges the burner for 20 - 50 s, and closes the purge solenoid valve after the purge is completed.

[0030] In the above implementation process, using the above settings avoids the residual pre-gas and the possible safety accidents caused by the existing pre-gas before the next operation of the combustion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of the combustion system 10a;

[0033] Figure 2 It is a schematic structural diagram of the combustion system 10b;

[0034] Figure 3 It is a specific flow schematic diagram of the steps of starting ignition and flame detection of the combustion components.

[0035] Icons: 10a - Combustion system; 10b - Combustion system; 100 - Gas pipe; 101 - First pressure monitoring mechanism; 103 - Pressure reducing valve; 105 - First flowmeter; 110 - Combustion air pipe; 111 - Second pressure monitoring mechanism; 113 - Second flowmeter; 115 - Venturi nozzle; 120 - Premixed gas pipe; 130 - Combustion air blower; 140 - Combustion assembly; 141 - Burner; 143 - Flame detector probe; 145 - Ignition mechanism; 146 - Burner controller; 147 - First pipe; 1471 - First solenoid valve; 148 - Second pipe; 1481 - Second solenoid valve; 150 - Purge blower; 153 - Purge pipe; 155 - Purge solenoid valve. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0038] Please refer to Figure 1 , the combustion system 10a includes a control system (not shown in the figure), a gas pipe 100, a combustion air pipe 110, a premixed gas pipe 120, a combustion air blower 130, a plurality of combustion assemblies 140, and a purge blower 150.

[0039] Among them, the control system is a PLC system, which includes a main controller and a memory connected electrically. The memory is used to store programs. After receiving an execution instruction, the main controller executes the program. Specifically, it can be set by referring to related technologies or directly purchased, which is not limited here.

[0040] The gas pipe 100 and the combustion air pipe 110 are respectively connected to the premixed gas pipe 120, and are used to transport gas and combustion air to the premixed gas pipe 120 and mix them in the premixed gas pipe 120.

[0041] Optionally, the combustion system 10b includes a Venturi nozzle 115. Among them, the gas pipe 100 and the combustion air pipe 110 are respectively connected to the convergent inlet of the Venturi nozzle 115, and the premixed gas pipe 120 is connected to the divergent outlet of the Venturi nozzle 115, ensuring that the gas and the premixed gas are mixed evenly and reducing the flow rate of the premixed gas flow.

[0042] Among them, the gas pipeline 100 is provided with a first pressure monitoring mechanism 101 for monitoring the pressure inside the gas pipeline 100, a pressure reducing valve 103 for adjusting the opening degree of the gas pipeline 100, and a first flowmeter 105 for monitoring the gas flow inside the gas pipeline 100; the first pressure monitoring mechanism 101, the pressure reducing valve 103, and the first flowmeter 105 are respectively electrically connected to the main controller. At this time, the main controller adjusts the opening degree of the regulating valve in real time through the pressure value fed back by the pressure monitoring mechanism to ensure the constancy of the pressure, and at the same time obtains the change of the real-time flow inside the gas pipeline 100 through the flow rate fed back by the first flowmeter 105.

[0043] Specifically, the pressure reducing valve 103 is provided with a PID controller (not shown in the figure), and the PID controller is electrically connected to the main controller. The number of the pressure reducing valves 103 is, for example, one, two, three, etc.

[0044] In this embodiment, the number of the pressure reducing valves 103 is two. The two pressure reducing valves 103, the first flowmeter, and the first pressure monitoring mechanism 101 are arranged in sequence along the flowing direction of the gas in the gas pipeline 100 in the manner of a pressure reducing valve 103, the first flowmeter, the other pressure reducing valve 103, and the first pressure monitoring mechanism 101. By using the two-stage pressure reducing valves 103 for adjustment, the constancy of the pressure inside the gas pipeline 100 is ensured, and at the same time, the excessive flow velocity is avoided.

[0045] One end of the combustion-supporting gas pipeline 110 far away from the Venturi nozzle 115 is communicated with the air outlet of the combustion-supporting fan 130. The combustion-supporting gas pipeline 110 is provided with a second pressure monitoring mechanism 111 for monitoring the pressure inside the combustion-supporting gas pipeline 110, and a second flowmeter 113 for monitoring the combustion-supporting gas flow inside the combustion-supporting gas pipeline 110; among them, the second flowmeter 113 is located on the side of the second pressure monitoring mechanism 111 close to the premixing gas pipeline 120. The combustion-supporting fan 130, the second flowmeter 113, and the second pressure monitoring mechanism 111 are respectively electrically connected to the main controller. The main controller starts or stops the combustion-supporting fan 130 through the information fed back by the second flowmeter 113 and the second pressure monitoring mechanism 111, and at the same time adjusts the power of the combustion-supporting fan 130 to regulate the air volume to ensure the constancy of the pressure inside the combustion-supporting gas pipeline 110.

[0046] Both the first pressure monitoring mechanism 101 and the second pressure monitoring mechanism 111 are pressure gauges with pressure transmitters. The pressure transmitters are electrically connected to the main controller. The pressure gauges use the pressure transmitters to transmit the monitored pressure data to the main controller.

[0047] A plurality of combustion assemblies 140 are arranged at intervals along the flowing direction of the air flow in the premixing gas pipeline 120.

[0048] Among them, each combustion component 140 includes: a burner 141, and a first pipeline 147 and a second pipeline 148 that are independently arranged and respectively communicate the burner 141 with the premixed gas pipeline 120.

[0049] Specifically, the burner 141 is, for example, a porous medium burner. Due to the existence of three heat transfer methods, namely convection, heat conduction, and radiation, the temperature in the combustion region tends to be uniform, maintaining a relatively stable temperature gradient. It also has a high volumetric heat intensity while the combustion is stable.

[0050] The burner 141 has an ignition mechanism 145 (specifically, for example, an ignition needle) for ignition and a flame detection probe 143 (for example, a flame detection needle) for detecting the flame.

[0051] Among them, the burner 141 can directly purchase a burner 141 on the market that has a burner controller 146, an ignition mechanism 145, and a flame detection probe 143. The burner controller 146 is electrically connected to the ignition mechanism 145 and the flame detection probe 143 respectively. The burner controller 146 controls whether the ignition mechanism 145 ignites, and starts or closes the flame detection probe 143 and obtains a flame detection signal indicating whether the flame detection probe 143 detects a flame. At this time, the burner controller 146 is electrically connected to the main controller, enabling the main controller to control whether the ignition mechanism 145 ignites, and to control the operation of the flame detection probe 143 and obtain the flame detection signal of the flame detection probe 143.

[0052] The first pipeline 147 is provided with a first solenoid valve 1471 for controlling its on-off, and the second pipeline 148 is provided with a second solenoid valve 1481 for controlling its on-off. Among them, the first solenoid valve 1471 and the second solenoid valve 1481 are in a normally closed state and are configured to close when powered off.

[0053] Specifically, the first solenoid valve 1471 and the second solenoid valve 1481 are respectively electrically connected to the main controller of the control system, and then the main controller controls the opening or closing of the first solenoid valve 1471 and the second solenoid valve 1481.

[0054] Among them, the diameter of the first pipeline 147 is smaller than the diameter of the second pipeline 148.

[0055] The purge blower 150 is used to provide purge gas to the burner 141. The burner 141 can be selectively communicated with the purge blower 150 through a purge solenoid valve 155. The purge solenoid valve 155 is in a normally closed state and is configured to close when powered off.

[0056] Please refer to Figure 2, in the combustion system 10b shown in some optional embodiments, the number of purge blowers 150 is one. The purge blower 150 is connected to a plurality of purge pipes 153 corresponding one-to-one to the burners 141. Each burner 141 is connected to the purge blower 150 through the corresponding purge pipe 153. Each purge pipe 153 is provided with a purge solenoid valve 155. At this time, the on-off of the purge pipe 153 is controlled by the purge solenoid valve 155 to selectively supply purge gas to the burner 141. However, at this time, since one purge blower 150 needs to correspond to a plurality of burners 141, the distances between each burner 141 and the blower are not equal and the blower power is relatively large. On the one hand, it is not convenient to control the purge time. On the other hand, there may be safety accidents caused by the failure of some purge solenoid valves 155.

[0057] Therefore, please refer to Figure 1 , in this embodiment, the purge blowers 150 correspond one-to-one to the combustion assemblies 140. Each burner 141 is connected to the corresponding purge blower 150 through an independent purge pipe 153. Each purge pipe 153 is provided with a purge solenoid valve 155. Since the purge blowers 150 and the purge pipes 153 corresponding to each burner 141 are independently arranged, the purge operation is more flexible and mutual interference is avoided.

[0058] In order to quickly notify the staff when the combustion system 10a cannot operate normally during the actual operation process, the combustion system 10a further includes an alarm mechanism (not shown in the figure) electrically connected to the main controller, so that when the main controller generates an alarm signal, the main controller triggers the alarm mechanism to alarm. The alarm mechanism includes but is not limited to a horn and can also be a warning light.

[0059] Since the main controller is electrically connected to the combustion air blower 130, the main controller can obtain the operating state of the combustion air blower 130. The main controller is configured to generate an alarm signal and trigger the alarm mechanism to alarm when it monitors that the combustion air blower 130 is operating abnormally (including self-closing, tripping or coupling fracture, etc.).

[0060] The main controller is provided with target parameters of the pressures in the combustion air pipe 110 and the fuel gas pipe 100. Since the main controller is electrically connected to the first pressure monitoring mechanism 101 and the second pressure monitoring mechanism 111, the main controller can obtain the actual pressure parameters (after adjustment) in the combustion air pipe 110 and the fuel gas pipe 100 in real time and compare them with the target parameters. The main controller is configured to generate an alarm signal and trigger the alarm mechanism to alarm when any of the adjusted actual pressure parameters exceeds the maximum or minimum threshold of the target parameters.

[0061] The main controller also acquires the safety characterization information of the external devices of the combustion system 10a. For the specific method, please refer to the related technology. The main controller is configured to generate an alarm signal and trigger the alarm mechanism to alarm when it determines that there are potential safety hazards in the external devices of the combustion system 10a based on the safety characterization information.

[0062] Since the main controller is electrically connected to the burner controller 146, the main controller can obtain the flame detection signals of each burner 141. The main controller is configured to generate an alarm signal and trigger the alarm mechanism to alarm when the flame detection signals of two combustion heads disappear.

[0063] Since the above-mentioned combustion system 10a is used to heat the furnace body, optionally, the combustion system 10a includes a furnace body (not shown in the figure). The burner 141 is used to heat the internal space of the furnace body. At this time, the furnace body is provided with a temperature detection mechanism (not shown in the figure) for detecting the temperature inside the furnace body, such as a thermocouple. The temperature detection mechanism is electrically connected to the control system. The main controller can obtain the actual temperature inside the furnace body. The main controller is provided with a target temperature inside the furnace body. The main controller is configured to compare the actual temperature inside the furnace body with the target temperature in real time. When the actual temperature is greater than the highest threshold of the target temperature, the main controller generates an alarm signal and triggers the alarm mechanism to alarm.

[0064] The premise of the above-mentioned alarm mechanism alarming has a great impact on the safe operation of the combustion system 10a. Therefore, the main controller is configured to close all the first solenoid valves 1471, the second solenoid valves 1481, the combustion air blower 130, and the ignition mechanism 145 when generating an alarm signal, and stop the operation of the combustion system 10a.

[0065] In summary, only by setting specific programs in the control system, the control system can accurately control the start or stop of the ignition mechanism 145, the flame detection probe 143, the first solenoid valves 1471, the second solenoid valves 1481, the purge solenoid valve 155, the combustion air blower 130, and the purge blower 150, and realize the automated combustion treatment operation in a short time, and achieve the automatic, safe, and stable combustion of each burner 141 of the combustion system 10a without manual intervention.

[0066] This embodiment also provides a control method for the above-mentioned combustion system 10a, which includes the following steps:

[0067] Ignite and detect the flame of the burner 141 in the combustion assembly 140 to be ignited in sequence along the flow direction of the gas flow in the premix gas pipe 120.

[0068] It should be noted that the combustion assembly 140 to be ignited at this time can be all the combustion assemblies 140, or multiple continuously or non-connectedly arranged combustion assemblies 140 obtained from all the combustion assemblies 140. In this embodiment, it all refers to multiple continuously arranged combustion assemblies 140.

[0069] Among them, please refer to Figure 3 , Figure 3 , which is a schematic flow diagram for starting ignition and flame detection of the combustion assembly 140. According to Figure 3 , the steps for ignition and flame detection of each burner 141 include:

[0070] S1. The control system controls the purge solenoid valve 155 to open, purges the burner 141, and closes the purge solenoid valve 155 after purging is completed.

[0071] S2. The control system controls the first solenoid valve 1471 to open, then controls the ignition mechanism 145 to ignite the burner 141, and controls the flame detection probe 143 to continuously perform flame detection. The main controller determines whether the ignition is successful based on the data fed back by the flame detection probe 143.

[0072] S3. If the flame detection probe 143 detects a flame, it is determined that the ignition is successful.

[0073] At this time, the control system controls the termination of ignition and combustion for 20 - 50 s, then opens the second solenoid valve 1481 so that the first pipeline 147 and the second pipeline 148 supply gas to the burner 141 simultaneously. After continuing to burn for 20 - 50 s, the ignition and flame detection of the burner 141 in the next combustion assembly 140 are carried out until the ignition of all burners 141 is completed.

[0074] By the on - off of the first pipeline 147 and the second pipeline 148, the flow rate of the premixed gas flow input to the burner 141 can be adjusted, realizing the adjustment of small - fire combustion and large - fire combustion of the burner 141. The operation is simple and convenient. At the same time, compared with directly using the different diameters of the first pipeline 147 and the second pipeline 148 and the method of switching between small fire and large fire by closing the first pipeline 147 and opening the second pipeline 148, it not only has convenient operation but also can realize the stable combustion of the burner 141.

[0075] S4. If the flame detection probe 143 does not detect a flame, it is determined that the ignition fails. At this time, the control system controls the ignition component to re - ignite.

[0076] The process of re - ignition includes:

[0077] S4.1. If the ignition is successful within three times, the ignition of the next combustion assembly 140 is carried out.

[0078] S4.2. If the ignition fails continuously three times, the ignition is terminated and an alarm signal is triggered. The first solenoid valve 1471 and the second solenoid valve 1481 corresponding to all combustion assemblies 140 are closed, and at the same time, the combustion - supporting blower 130 is closed to stop the operation of the combustion system 10a.

[0079] After actual ignition, during the operation of the combustion system 10a, some of the burners 141 may suddenly go out, and the flame detection signals of the flame detection probes 143 corresponding to the burners 141 disappear. At this time, different measures are taken according to the number of flame detection signals that disappear to remedy it specifically and prevent safety accidents from occurring.

[0080] Specifically, the measures taken for the disappearance of the flame detection signal during the operation of the combustion system 10a include:

[0081] S100. Obtain the number of burners 141 with disappeared flame detection signals.

[0082] S101. If the flame detection signal of the flame detection probe 143 corresponding to one burner 141 disappears, the control system controls the first solenoid valve 1471 and the second solenoid valve corresponding to the burner 141 with the disappeared flame detection signal, as well as the second solenoid valves 1481 of the other combustion components 140 to close, and opens the purge solenoid valve 155 corresponding to the burner 141 with the disappeared flame detection signal for purging. After purging is completed, the purge solenoid valve 155 is closed, and the burner 141 with the disappeared flame detection signal is reignited and flame detection is performed.

[0083] S1011. If the flame detection probe 143 detects a flame, the second solenoid valves 1481 corresponding to all the combustion components 140 are opened.

[0084] S1013. If ignition fails three times in a row, the control system terminates ignition and closes the first solenoid valves 1471 corresponding to all the combustion components 140.

[0085] S110. If the flame detection signals of the flame detection probes 143 corresponding to two or more burners 141 disappear, the control system controls the first solenoid valves 1471 and the second solenoid valves 1481 corresponding to all the combustion components 140 to close, and triggers an alarm and stops the operation of the combustion system 10a.

[0086] Finally, after the operation of the combustion system 10a ends, the control system controls the first solenoid valves 1471 and the second solenoid valves 1481 corresponding to all the combustion components 140 to close, opens the purge solenoid valve 155 and purges the burners 141 for 20 - 50 s. After purging is completed, the purge solenoid valve 155 is closed.

[0087] During the actual operation process, when the main controller is triggered and generates an alarm signal, the main controller triggers the alarm mechanism to alarm and closes all the first solenoid valves 1471, the second solenoid valves 1481, the combustion air blower 130, and the ignition mechanism 145, and stops the operation of the combustion system 10a.

[0088] In summary, the combustion system provided by the embodiments of the present application adjusts the flow rate of the premixed gas flow input to the burner to achieve the adjustment of the small-fire combustion and large-fire combustion of the burner. The operation is simple and convenient, and the stable combustion of multiple burners is realized. The control method of the above combustion system is simple in operation, ensuring the safe and stable operation of the combustion system and the stable combustion of each burner at the same time.

[0089] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a combustion system, characterized in that, the combustion system includes a control system, a gas supply pipe, an auxiliary combustion gas supply pipe, a plurality of combustion components, a premixing gas supply pipe, and a purge fan; the gas supply pipe and the auxiliary combustion gas supply pipe are respectively communicated with the premixing gas supply pipe, and the plurality of combustion components are arranged at intervals along the flow direction of the gas flow in the premixing gas supply pipe; each combustion component includes: a burner, and a first pipe and a second pipe which are independently arranged and respectively communicate the burner with the premixing gas supply pipe; the burner has an ignition mechanism for ignition and a flame detector for detecting the flame, the first pipe is provided with a first solenoid valve for controlling its on-off, and the second pipe is provided with a second solenoid valve for controlling its on-off; the burner can be selectively communicated with the purge fan through a purge solenoid valve, and the purge fan is used to supply purge gas to the burner; the control system is electrically connected to the ignition mechanism, the flame detector, the first solenoid valve, the second solenoid valve, the purge fan, and the purge solenoid valve respectively to control the operating states of the components; the control method includes the following steps: ignite and detect the flame of the burner in the combustion component to be ignited in sequence along the flow direction of the gas flow in the premixing gas supply pipe; wherein, the steps of igniting and detecting the flame of each burner include: the control system controls the first solenoid valve to open, then controls the ignition mechanism to ignite the burner, and controls the flame detector to continuously detect the flame. If the flame detector detects the flame, it is determined that the ignition is successful. After terminating the ignition and burning for 20 - 50 s, the second solenoid valve is opened so that the first pipe and the second pipe supply gas to the burner simultaneously. After continuing to burn for 20 - 50 s, the ignition and flame detection of the burner in the next combustion component are carried out until all the burners are ignited.

2. The control method for a combustion system according to claim 1, characterized in that, the control system is electrically connected to the purge solenoid valve and the purge fan to control the operating states of the components; before the ignition and flame detection of the burner in each combustion component, the control method further includes: the control system controls the purge solenoid valve to open, purges the burner, and closes the purge solenoid valve after the purge is completed.

3. The control method for a combustion system according to claim 1, characterized in that, in the steps of igniting and detecting the flame of each burner, if the flame detector does not detect the flame, it is determined that the ignition fails. The control system controls the ignition mechanism to re-ignite. If the ignition fails continuously three times, the ignition is terminated and the first solenoid valve and the second solenoid valve corresponding to all the combustion components are closed.

4. The control method for a combustion system according to claim 2, characterized in that, During the operation of the combustion system, if the flame detection signal of the flame detection probe corresponding to one of the burners disappears, the control system controls the closing of the first solenoid valve and the second solenoid valve corresponding to the burner with the disappeared flame detection signal, and the second solenoid valves of the remaining combustion components, and opens the purge solenoid valve corresponding to the burner with the disappeared flame detection signal for purging. After the purging is completed, the purge solenoid valve is closed, and the burner with the disappeared flame detection signal is reignited and flame detection is performed. If the flame detection probe detects a flame, the second solenoid valves corresponding to all the combustion components are opened.

5. The control method of the combustion system according to claim 4, wherein, in the step of reigniting the burner with the disappeared flame detection signal and performing flame detection, if ignition fails three times in a row, the control system terminates ignition and closes the first solenoid valves corresponding to all the combustion components.

6. The control method of the combustion system according to claim 1, wherein, during the operation of the combustion system, if the flame detection signals of the flame detection probes corresponding to two or more burners disappear, the control system controls the closing of the first solenoid valves and the second solenoid valves corresponding to all the combustion components.

7. The control method of the combustion system according to claim 2, wherein, after the operation of the combustion system is completed, the control system controls the closing of the first solenoid valves and the second solenoid valves corresponding to all the combustion components, opens the purge solenoid valve and purges the burner for 20 - 50 s, and closes the purge solenoid valve after the purging is completed.

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