SYSTEM AND METHODS FOR DETECTING FLOW RESTRICTIONS IN BOILERS

Abstract

The invention is a flow restriction detection system (10) and method for monitoring the flow restriction occurring in the flue gas passages of the heat exchanger or in the heat transfer surfaces in contact with the flue gas in boilers (20). In the invention, a reference pulse width modulation value is selected to determine the operating level of the fan (21), and the reference rotational speed of the fan (21) is determined at this value. The control rotational speed information is obtained by restarting the fan (21) at the same pulse width modulation value during its operating life. The control rotational speed information is compared with the reference rotational speed information, and the difference between these two is evaluated in terms of flow restriction. Figure 1

Description

1 TARIFF SYSTEM AND METHODS FOR DETECTING FLOW RESTRICTIONS IN BOILERS TECHNICAL AREA 5 The invention relates to the use of a fan to regulate the flow of gas before or after the combustion chamber. provided and the flue gas resulting from combustion passes through at least one heat exchanger. In boilers where a fluid is heated by passing it through passages, the aforementioned flue gas passage 10 occurring in the pathways or heat transfer surfaces in contact with flue gas a flow restriction due to contamination, sedimentation, narrowing or blockage It relates to a system and method for monitoring the situation. PREVIOUS TECHNIQUE In condensing boilers, the main heat exchanger takes heat from the hot flue gas produced as a result of combustion. It enables the transfer of heat to the fluid circuit. Efficient heat transfer. For this to happen, the flue gas must flow through the heat exchanger channels under suitable conditions. It needs to advance and make sufficient contact with the heat exchanger surfaces. In these systems... Combustion air and / or flue gas flow is usually directed with the help of a fan. 20 The fan's operation is crucial for the continuity of the combustion process and the removal of flue gas from the system. This is of great importance. In condensing boilers, flue gas temperature is crucial for both energy efficiency and... This is considered one of the key parameters that must be monitored in terms of device security. Flue gas temperatures must remain within certain limits according to current standards. Compliance must be ensured and the thermal resistance limits of the parts used in the heat exchanger and flue line must be 25. It is important to ensure that it is not exceeded. In existing systems, the flue gas passages of the main heat exchanger become contaminated and soot accumulate over time. Shrinkage occurs due to accumulation, dust, or foreign matter. This situation This hinders flue gas flow, reducing heat transfer between the heat exchanger surfaces and the flue gas by 30 This reduces the efficiency of the device. As a result of the decrease in heat transfer... The flue gas temperature is rising and approaching the system's safe operating limits. This is the reason. In current practices, chimney inspection is usually used to detect such problems. Gas temperature sensors, pressure sensors, or gas sensors are used. However, this Sensors increase device cost, require additional cabling and assembly, and necessitate maintenance. 35 increasing the need and the risk of false warnings or safety shutdowns due to sensor failures This brings with it the following consequences. However, the inability to detect pollution in the early stages... 2 Maintenance is only needed in cases of performance degradation or approaching safety limits. This becomes apparent later, negatively impacting user comfort and service planning. It has an effect. In conclusion, all the problems mentioned above necessitate an innovation in the relevant technical field. It has made it mandatory. A BRIEF DESCRIPTION OF THE INVENTION The present invention aims to eliminate the aforementioned disadvantages and contribute to the relevant technical field. In order to bring new advantages, a flow constraint detection system and the identification of flow constraints. It is related to a method aimed at... Heat transfer in the flue gas passages of the heat exchanger or in contact with the flue gas The flow restriction occurring on their surfaces, an additional flue gas temperature sensor, pressure 15 a system and method that enables detection without the use of a sensor or gas sensor to reveal. All the purposes mentioned above and those that will emerge from the detailed explanation below. The present invention aims to achieve this by connecting a fan to the combustion chamber, either before or inside the combustion chamber. subsequently, gas flow is ensured and at least one heat source is released from the flue gas resulting from combustion. In boilers where a fluid is heated by passing it through the flue gas passages of a heat exchanger, heat transfer in the aforementioned flue gas passages or in contact with the flue gas contamination, buildup of deposits, narrowing or blockage occurring on their surfaces It is a method for monitoring a flow constraint situation depending on the circumstances. This is 25 innovation according to -Adjusting the fan's operating level via a fan controller unit for the fan. a reference pulse width modulation (PWM) value generated for a specific purpose Selecting the pulse width modulation value, -From the fan controller, the fan is set to the mentioned reference pulse width modulation value of 30. When the system is started, the fan's rotational speed is obtained and this speed is used as the reference rotational speed. determination, - At any time during the fan's lifespan, the fan can be controlled via the fan controller. a control pulse width modulation equal to the reference pulse width modulation value A start signal of this value is given, and the fan controller controls this pulse width at 35. A control that relates to how fast the fan spins in response to the modulation value. Obtaining rotational speed information, 3 -Comparison of control rotation speed information with reference rotation speed information, -the control rotational speed information is obtained from the reference rotational speed information, between which there is a prior agreement. being slow enough to have a difference greater than a specified first boundary deviation value In this case, there is a first-order flow restriction in the flue gas passages. Level notification signal generation 5 It includes steps. Thus, the flow restriction that develops over time in the flue gas passages is overcome with additional fan operation without using a flue gas temperature sensor, pressure sensor or gas sensor It is monitored through its characteristics. A feature of a possible configuration of the invention is that the control rotational speed information is based on the reference rotational speed. from the speed information, among them, greater than the predetermined first limit deviation value. It will be slow enough to have a difference greater than the second boundary deviation value. in this case, the flow level in the flue gas passages is higher than the first-order flow restriction. the step of generating a second-level notification signal indicating that there is a second-order flow constraint This includes the fact that the level of flow constraint can be evaluated gradually and further 15 Flow restrictions at this level can be identified earlier. Another possible configuration of the invention features a second-level notification signal, in the boiler limiting its operation, preventing the ignition process, restricting fuel supply 20 It includes this step. Thus, in case of severe flow restriction, intervention in boiler operation is possible. This reduces high temperatures, efficiency loss, and safety risks. Another possible configuration of the invention features a reference rotational speed, which is determined by the initial position of the boiler. 25 after installation, commissioning, end-of-production inspection or maintenance This includes the step of determining the installation, commissioning, and production for each boiler. Alternatively, a suitable reference rotational speed is obtained based on post-maintenance conditions. Another possible configuration of the invention involves the control rotational speed information being transmitted to the fan. 30 measurements were taken within a measurement range where the control pulse width modulation was operated at a specific value. It involves determining the average of multiple rotational speed values. This reduces the impact of transient velocity fluctuations on the measurement result and minimizes flow restriction. The accuracy of the assessment is being improved. However, the invention involves a fan located either before or after the combustion chamber. where gas flow is provided and the flue gas resulting from combustion passes through at least one heat exchanger. a boiler is a device that heats a fluid by passing it through flue gas passages. 4 heat transfer in the flue gas passages or in contact with the flue gas contamination, buildup of deposits, narrowing or blockage occurring on their surfaces A flow constraint is identified to monitor a flow constraint situation depending on its conditions. It is a system. Its distinguishing feature is, -5 for adjusting the fan's operating level via a fan controller belonging to the fan. In response to a reference pulse width modulation (PWM) value produced, the fan from the controller, the fan at the mentioned reference pulse width modulation value obtaining the reference rotational speed information of the fan when it is started, -a reference pulse width modulation value and a reference rotational speed value transfer to memory unit, 10 - At any time during the fan's lifespan, the fan can be controlled via the fan controller. a control pulse width modulation equal to the reference pulse width modulation value a start signal is given at a certain value, this control pulse width is from the fan controller A control that relates to how fast the fan spins in response to the modulation value. Obtaining the rotational speed information, 15 -the reference rotation speed information and the control rotation speed information in the memory unit comparison, -the control rotational speed information is obtained from the reference rotational speed information, between which there is a prior agreement. being slow enough to have a difference greater than a specified first boundary deviation value In this case, there is a first-order flow restriction in the flue gas passages. It includes a processing unit that enables the generation of a level notification signal. Another possible configuration of the invention features the reference control rotational speed information. from the rotational speed information, between which is a predetermined first limiting deviation value The difference will be slower than a second boundary deviation value that is larger than 25. in this case, the flue gas passages will have a flow restriction higher than the first-order flow restriction. generating a second-level notification signal indicating that there is a second-level flow constraint at that level. It includes the processor unit. Another possible configuration of the invention features a second-level notification signal, in boiler 30. limiting its operation, preventing the ignition process, restricting fuel supply sends a message to the boiler control unit to cut off or stop the boiler operation. It includes the processor unit. Another possible configuration of the invention involves transferring the control rotational speed information to the fan's 35 a measurement taken within a range where the control pulse width modulation is operated at a specific value It includes a processing unit that determines the average of multiple rotational speed values. BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows the flowchart of the flow constraint detection system. Figure 2 shows a representative schematic view of the flow constraint detection system. DETAILED DESCRIPTION OF THE INVENTION This detailed explanation of the invention does not merely aim to provide a better understanding of the subject matter; it is a comprehensive explanation of the invention. This is explained with examples that will not create a limiting effect. The flowchart of the invention’s flow constraint detection system (10) is given in Figure 1. Accordingly, flow restriction detection system (10) detects at least one heat exchanger located in a boiler (20) in flue gas passages or heat transfer surfaces in contact with flue gas 15 flow restriction due to possible contamination, sediment buildup, narrowing or blockage It ensures that the situation is monitored. The mentioned system works in the boiler (20). providing gas flow before or after the combustion chamber during combustion the operating level of the fan (21) and the rotation of the fan (21) corresponding to this operating level It uses information regarding the velocity. In this way, the flue gas passing through the heat exchanger is 20 Changes occurring in the flow are reflected in the operating characteristics of the fan (21). is being evaluated. The boiler mentioned herein (20) uses the heat energy obtained from burning the fuel to produce a It is a heating device that enables the heating of a fluid. The fluid in question can be a gas or liquid. 25 It can be a heat transfer fluid; water, heating water, domestic water, drinking water or other It can be any fluid. The boiler (20) is basically a combustion chamber, for combustion a burner that provides the necessary air and fuel mixture, the heat produced as a result of combustion a flue gas line through which flue gas is directed, transferring heat from the flue gas to a fluid at least one heat exchanger that enables the transfer of heat and a fluid through which the heated fluid circulates 30 It includes a circuit. Hot flue gas is formed by burning the fuel in the boiler (20), The flue gas is passed through a heat exchanger, and the heat contained in the flue gas is transferred to the heat exchanger. It is transferred to the fluid in the fluid circuit through their surfaces. This is the working principle. thanks to the boiler (20), heated water is supplied to the heating system or domestic hot water line, for example. It can provide water. 35 6 The flow constraint detection system (10) includes a processor unit (30). The processor unit (30) is a The CPU can be a GPU, a microprocessor, etc. The processor unit (30) is the fan (21) obtaining the values ​​related to the operation, comparing them with the recorded values, and this to evaluate a flow constraint situation based on comparison It is configured. The processor unit (30) is connected to a fan controller (22) located in the boiler (20) 5 It can communicate. The mentioned fan controller (22) regulates the operation of the fan (21) and It is an electronic control element that determines the operating signals sent to the fan (21). The processor unit (30) receives information from the fan controller (22) regarding the operating level of the fan (21) and It can receive information about the rotational speed of the fan (21). The fan (21) located inside the boiler (20) is placed before or inside the combustion chamber. It then enables the gas flow to be realized. The operating level of the fan (21), pulse width modulation (PWM) signal generated by fan controller (22) The pulse width modulation signal is adjusted to electrically control which fan (21) It is a control signal that determines that the fan (21) will be driven at the operating level. at a rotational speed depending on the applied pulse width modulation value When the flue gas passages of the heat exchanger are clean and open, the fan (21) the rotational speed it can reach at a specific pulse width modulation value at a certain value This results in contamination, sedimentation, and narrowing of the flue gas passages. or when a blockage occurs, the resistance to flue gas flow increases and the fan's speed increases. (21) The rotational speed that can be reached at the same working level decreases. The processor unit (30) first requires a reference pulse in order to detect the flow constraint (10). It is based on the width modulation value. Reference pulse width modulation. The value 25 enables the fan (21) to operate at a specific and repeatable operating level. is selected as a value. The value mentioned is, for example, when the fan (21) is at full power (100%) It can be a value that enables its operation. However, the reference pulse width. The modulation value depends on the system characteristics, the type of fan (21), the capacity of the boiler (20) or as a value corresponding to a lower operating level according to measurement accuracy This can also be determined. The important point is that the reference pulse width modulation value is 30. It can be reapplied in subsequent measurements and the fan (21) is in the same operating condition It allows for evaluation. After selecting the reference pulse width modulation value, the fan (21) operates at this value. It is operated and the rotational speed that the fan (21) reaches at this operating level is taken. 35 The obtained rotational speed information is determined as the reference rotational speed. Reference rotation the rate, in a situation where the flue gas passages of the heat exchanger have an acceptable opening. 7 This represents the obtained fan (21) speed information. Accordingly, in the preferred configuration This value is determined during the initial installation of the boiler (20), so that the passageways reference to the operation of the fan (21) in ideal condition, which has not yet been soiled or deformed. However, the reference rotational speed is taken during the initial installation of the boiler (20), Cleaning process during end-of-production inspection, commissioning phase or post-maintenance It can be determined after completion. In this way, each boiler (20) has its own installation. suitable for the conditions, flue line structure, fan (21) tolerances and heat exchanger specifications A reference value is obtained. The flow constraint detection system (10) includes a memory unit (40). Memory unit (40) is reference 10 Storing the pulse width modulation value and reference rotational speed information. The memory unit (40) also provides the control rotation speed obtained later. information, deviation values, warning logs, and reference values ​​redefined after maintenance. It can also store values. The memory unit (40) exchanges data with the processor unit (30). It is configured to do so. Thus, the processor unit (30) is configured to do so in the past 15 The reference value can be accessed later. The fan (21) can be checked at any time during the service life of the boiler (20). a control pulse width equal to the reference pulse width modulation value again It is operated at the modulation value. This operation is performed every time the boiler (20) is started. It can be done as is, or at predetermined intervals. The interval mentioned, calendar period, boiler (20) operating time, fan (21) operating time, burner commissioning depending on different parameters such as the number or when these values ​​are evaluated together This can be determined. In this context, flow constraint monitoring is only done in a time-dependent manner. not having to, the actual usage intensity of the accident (20) can also be taken into account. 25 During the control measurement, the fan (21) is controlled via the fan controller (22) pulse width. It is operated at the modulation value. In order for the fan (21) to reach the relevant operating level If necessary, a short waiting period is applied. This waiting period is the fan (21) speed. This ensures that it becomes stable and that the measurement is repeatable. Then the fan's 30 (21) rotational speed is obtained and this speed is determined as the control rotational speed information. Control rotation speed information is obtained at the same fan (21) operating level as the reference rotation speed. This represents the current fan (21) speed information obtained. Based on this, two speed information The difference between them is not due to a change in the fan (21) operating level, but to the flow in the system. It can be considered as an indicator resulting from changes in conditions. 35 8 The processor unit (30) receives the control speed information and the reference speed information. It compares the two values. As a result of the comparison, a first deviation value is obtained. The comparison process involves calculating the absolute difference between the two speed values. This can be done. Alternatively, the control rotation speed information can be used as the reference rotation speed. the ratio of the information or the proportional deviation according to the reference rotational speed information is 5 It can be calculated. The calculated difference, ratio, or deviation value is a predetermined minimum. It is compared with a limiting deviation value. The control rotation speed information is compared with the reference rotation. According to the velocity information, a drop above a certain level in the flue gas passages This indicates that its resistance has increased. The first boundary deviation value represents a first-level flow restriction in flue gas passages. It is determined in a way that represents its presence. The first level in question is possible. It represents an initial or mid-level constraint in the design. Control rotation speed. The information is derived from the reference rotational speed information, and there is more than one limiting deviation value between them. When the difference is low enough to be noticeable, the processor unit (30) sends a first-level notification signal 15 It produces a notification signal to inform the user of the need for maintenance and to send data to the service unit. sending, displaying a warning on the boiler (20) screen or a maintenance in the control unit This can be used to create a record. Thus, contamination on the heat exchanger side or The contraction is detected before it reaches safety limits and the maintenance process is initiated. Planning is allowed. 20 In the preferred configuration, the processor unit (30) differs from the first boundary deviation value. It also uses at least a second boundary deviation value. The second boundary deviation value is the first boundary. It represents a more severe level of flow restriction based on the deviation value. Control rotation. The speed information will exceed the second limit deviation value according to the reference rotational speed information by 25. When the processor unit (30) is low, a flow constraint higher than the first level detecting a second-level flow constraint and a second-level notification of its existence. It produces a signal. The second level notification signal indicates the operating power of the accident (20). reducing, limiting the operation of the boiler (20), preventing the ignition process, 30 for cutting off the fuel supply or stopping the operation of the boiler (20) This is possible. For this reason, the second level notification signal activates the operating controls of the accident (20). This is transmitted to the boiler control unit (23). In this way, the flue gas passages High temperatures, efficiency reduction, or other issues that may arise due to advanced flow constraints. The security risk is reduced. 35 Instead of making a decision based solely on an instantaneous velocity measurement, the flow constraint detection system (10) It can evaluate multiple measurement values ​​together. The processor unit (30) is the same control. 9 multiple rotational speed samples taken at pulse width modulation value It can calculate the average. Also, sudden or unusual changes during measurement... The observed speed values ​​can be excluded from the evaluation. In this way, the fan (21) short-term fluctuations in speed, electrical noise, or transient operation 5 The conditions may cause an incorrect first-level or second-level flow restriction to be detected. This is prevented. The control rotation speed is used to make the measurement result more reliable. This information can be obtained from velocity values ​​collected over a specific sampling period. Reference rotation speed information is specific to the installation conditions where the boiler (20) is located. is determined. Because the length of the chimney line, chimney connection elements, fan (21) production 10 tolerances, heat exchanger manufacturing tolerances and assembly conditions differ in each boiler (20). It can show. Therefore, a fan speed limit (21) that is fixed and the same for all devices. instead, the reference rotational speed information generated by measuring in the relevant boiler (20) is used It provides a more accurate assessment. System re-reference process after maintenance or heat exchanger cleaning. It can perform this. In this case, the fan (21) again reference pulse width modulation It is operated at its specified value, and a new reference rotational speed information is obtained. The new reference rotation speed information obtained is saved to the memory unit (40) and the old reference It can be used in place of the value. Thus, system conditions that change after maintenance, 20 Modified parts or cleaned heat exchanger surfaces are taken into consideration. This feature, first and second level flow restriction throughout the system's long service life. This enables them to make more accurate assessments. In the possible configuration, the flow constraint detection system (10) includes a user interface (50). 25 The mentioned user interface (50) is available on computers, tablets, mobile phones, etc. This can be accessed through a mobile application, a website, etc. apart from the user interface (50), a screen located on the boiler (20), instrument panel, It can be an interface. The first-level notification signal generated by the processor unit (30). and the second level notification signal can be transmitted to the aforementioned user interface (50). 30 The first level notification signal indicates the need for maintenance via the user interface (50). This can be presented as a warning, informational message, error code, or maintenance log. First The level notification signal is also displayed on an indicator, a screen on the boiler (20). to the unit, audible warning element, remote communication module or service diagnostics It can be transmitted to the interface. The second level notification signal is the user interface (50) 35 It can also be displayed as a higher-level flow restriction warning and limiting the operation of the boiler (20), preventing the ignition process, fuel safety such as interruption of supply or stopping of boiler (20) operation It is sent to the boiler control unit (23) to initiate the actions. Thus, the first In the case of level flow restriction, the need for maintenance can be notified to the user or service unit, second In the case of level flow restriction, the aim is to protect the safe operation of the device during the study. This ensures that it is stopped. 5 The user interface (50) displays information from the flow constraint detection system (10) to the user or It enables monitoring by service personnel. User interface (50) Reference rotation speed information, control rotation speed information, calculated deflection value, first boundary deviation value, second boundary deviation value, first level flow constraint information and second level 10 Flow constraint information can be displayed. The user interface (50) also displays flow constraint detection (10) the date or work cycle in which it was performed, previous measurement results and maintenance It can display its history. This allows the user or service personnel to see the history on the heat exchanger side. It can track flow constraint development over time or depending on usage intensity. Flow restriction detection system (10) in different boiler (20) types and different fan (21) structures It is applicable. The fan (21) can be driven by pulse width modulation signal and the fan (21) Obtaining information about the rotational speed is sufficient for the implementation of the system. Heat exchangers are different types of devices that facilitate heat transfer between flue gas and a fluid. Flue gas passages can be ducts, gaps, pipes, fins, or 20 It may include similar transition areas. Incidents occurring in the aforementioned transition routes... contamination, soot buildup, condensation residue, dust, foreign matter accumulation, shrinkage or blockage, a flow resistance affecting the rotational speed of the fan (21) at the same operating level. This is considered an increase in flow resistance. This increase in flow resistance depends on the amount of deflection. They can be classified as either first-level flow constraints or second-level flow constraints. 25 In possible configurations, intermediate levels can be included in addition to the first and second levels. These levels can be determined, and signals can be generated based on these levels. Here corresponds to the working principle of the flow constraint detection system (10) described above. A method for detecting an incoming flow restriction is also provided. In the mentioned method, the fan (21) 30 The reference pulse width modulation value determines the operating level. is taken and the fan (21) can be removed at any time during the working life of the boiler (20). The fan (21) is operated at a control pulse width modulation value equivalent to the value. At this operating level, the control rotational speed information reached is obtained, and the reference rotational speed is also considered. The control rotational speed information is compared with the reference rotational speed information. if it is so low that it exceeds the first limit deviation value determined beforehand, First-level notification of the presence of a first-level flow restriction in the flue gas passages. 11 a signal is generated. In the preferred configuration, the control rotation speed information is used as a reference. According to the rotational speed information, it will exceed the second predetermined limit deviation value. If it is low, a second-level notification indicates that a second-level flow restriction exists. A signal is generated. The generated notification signals inform the user or service provider of the need for maintenance. notification to the unit, limitation of boiler (20) operation, ignition process 5 blocking, interruption of fuel supply or stopping of boiler (20) operation It is used for this purpose. The invention relates to the system and method with first-level and second-level flow restriction information, chimney. This can be achieved without the need for an additional sensor that directly measures the gas temperature. 10 Information regarding the operating level of the fan (21) and the rotational speed of the fan (21) is provided in the boiler (20) This can be obtained from the existing fan (21) control and speed feedback infrastructure. This allows the flow on the heat exchanger side to be monitored without the need for additional temperature, pressure, or gas sensors. It becomes possible to monitor the conditions. Reducing the number of sensors, part It helps reduce costs and assembly requirements. At the same time, sensor 15 This also reduces the likelihood of false warnings or unnecessary safety shutdowns due to malfunctions. The scope of protection of the invention is specified in the claims attached hereto, and these details are strictly adhered to. The explanation cannot be limited to those given for illustrative purposes. Because a technically skilled person... The person, without deviating from the main theme of the invention, can create similar 20 based on the above-mentioned points. It is clear that these structures can emerge. 12 REFERENCE NUMBERS GIVEN IN THE FIGURE Flow Restriction Detection System Kazan 5 21 Fan 22 Fan Controller 23 Boiler Control Unit Processor Unit 10 40 Memory Units 50 User Interfaces

Claims

13 REQUESTS 1. The invention involves a fan (21) to displace gas before or after the combustion chamber. where the flow is ensured and the flue gas resulting from combustion passes through at least one heat exchanger. In boilers where a fluid is heated by passing it through flue gas passages (20) 5 heat transfer in the aforementioned flue gas passages or in contact with the flue gas contamination, accumulation, narrowing or blockage occurring on their surfaces a method for monitoring a flow constraint situation depending on its conditions feature; - The fan (21) is started via a fan controller (22) unit belonging to the fan (21). a reference pulse width generated for adjusting the level the modulation (PWM) value as the reference pulse width modulation value selection, -fan controller (22), reference pulse width modulation of fan (21) When operated at a value of 15, the rotational speed of the fan (21) is obtained and this speed is 15 determined as the reference rotational speed, - At any time during the working life of the fan (21) the fan controller (22) through the fan (21) a control equal to the reference pulse width modulation value The fan is activated by providing a start signal at the pulse width modulation value. from the controller (22) corresponding to this control pulse width modulation value 20 a control rotation speed information about how fast the fan (21) is spinning taking, -Comparison of control rotation speed information with reference rotation speed information, -the control rotational speed information is obtained from the reference rotational speed information, between which there is a prior agreement. 25 slowly, with a difference greater than a specified first boundary deviation value. In this case, there is a first-order flow restriction in the flue gas passages. generating a first-level notification signal regarding It includes the steps.

2. A method according to claim 1, characterized by its control rotational speed information being referenced at 30°. from the rotational speed information, among them, the first limiting deviation, which is predetermined. a second boundary deviation value that is greater than the first value, a difference greater than the first value If the flow is slow enough to cause first-degree problems in the flue gas passages... a second-order flow constraint that is higher than the flow constraint It involves the step of generating a second-level notification signal. 35 14 3. It is a method according to claim 2 and its feature is that the second level notification signal, win (20) limiting its operation, preventing the ignition process, restricting fuel supply To cut off or stop the operation of the boiler (20) to the boiler control unit (23) includes the sending step.

4. It is a method according to claim 1 and its feature is that the reference rotational speed is the first of the accident (20). after installation, commissioning, end-of-production inspection or maintenance It includes the step of identification.

5. It is a method according to claim 1 and its feature is that the control rotation speed information of the fan (21) 10 in a measurement range where the control pulse width modulation is operated at a specific value the step of determining the average of multiple rotational speed values ​​obtained It includes.

6. The invention involves a fan (21) to remove gas before or after the combustion chamber. where the flow is ensured and the flue gas resulting from combustion passes through at least one heat exchanger. a boiler (20) in which a fluid is heated by passing it through flue gas passages, in the flue gas passages or with the flue gas inside the boiler (20) Fouling and deposit formation occurring on contacting heat transfer surfaces, Monitoring a flow restriction situation due to narrowing or blockage conditions 20 It is a flow constraint detection system (10) and its feature is; -the operating level of the fan (21) via a fan controller (22) belonging to fan (21) a reference pulse width modulation produced for adjustment In response to the (PWM) value, the fan controller (22) mentions the fan (21). When operated at the reference pulse width modulation value, the fan (21) reference 25 obtaining information on rotational speed, -reference pulse width modulation value and reference rotational speed value transfer to a memory unit (40), - At any time during the working life of the fan (21) the fan controller (22) via the fan (21) a control equal to the reference pulse width modulation value 30 The fan should be activated by providing a start signal at the pulse width modulation value. from the controller (22) corresponding to this control pulse width modulation value a control rotation speed information about how fast the fan (21) is spinning taking, -the reference rotation speed information (40) in the memory unit and the control rotation speed information 35 comparison, -the control rotational speed information is obtained from the reference rotational speed information, between which there is a prior agreement. slow enough to have a difference greater than a specified first boundary deviation value. In this case, there is a first-order flow restriction in the flue gas passages. a processor unit (30) that enables the generation of a first-level notification signal. It includes. 5 7. According to claim 6, a flow constraint detection system (10) has the feature of; control rotation speed from the reference rotational speed information, between which a predetermined, first a second boundary deviation value that is greater than the first boundary deviation value If the speed is too slow to the point where there is a significant difference, the first 10 in the flue gas passages that there is a second-order flow constraint at a higher level than the first-order flow constraint It includes a processor unit (30) that generates a second-level notification signal.

8. According to claim 7, a flow constraint detection system (10) has the feature of; second level notification the signal, limiting the operation of the boiler (20), ignition process 15 preventing, interrupting the fuel supply or boiler (20) operation the processor unit (30) which sends the boiler control unit (23) to stop it It includes.

9. A flow constraint detection system (10) according to claim 6, and its feature is; control rotation speed 20 information that the fan (21) is operated at the control pulse width modulation value as the average of multiple rotational speed values ​​obtained within the measurement range It includes the determining processor unit (30).

Images