Energy-saving boiler safety monitoring device

Abstract

The invention provides an energy-saving boiler safety monitoring device, and relates to the field of boilers. An energy-saving boiler safety monitoring device comprises a coal economizer, liquid temperature and flow velocity sensors are arranged at the liquid inlet end and the liquid outlet end of the coal economizer, a gas temperature and flow velocity sensor is arranged at the gas inlet end of the coal economizer, and the liquid inlet end of the coal economizer is connected with and penetrates through a water pump which is located in front of the liquid temperature and flow velocity sensors. And a cooling mechanism is arranged on one side of the coal economizer. According to the energy-saving boiler safety monitoring device, liquid temperature and flow velocity sensors are arranged at the liquid inlet end and the liquid outlet end, gas temperature and flow velocity sensors are arranged at the gas inlet end and the gas outlet end, and water quality changes can be detected by detecting the flow velocity difference value of liquid and the flow velocity difference value of gas; therefore, the safe operation of the energy-saving boiler can be ensured by changing the parameters which influence the safe operation of the energy-saving boiler, such as combustion change and leakage.

Description

Technical Field

[0001] The invention relates to the field of boilers, and in particular to an energy-saving boiler safety monitoring device. Background Art

[0002] Economizer is a device installed at the bottom of the flue at the tail of the boiler. It is mainly used to recover the waste heat of the exhaust gas and improve the thermal efficiency of the boiler by heating the feed water, thereby saving fuel and reducing energy consumption. It is usually composed of horizontally arranged serpentine tubes, which can be plain tubes or finned. Finned economizers include H-type and spiral finned types. Economizer is an important device in energy-saving boilers.

[0003] Too much dust accumulates in the economizer pipe, causing blockage, making it impossible for the inlet flue gas to flow normally, increasing the pressure, and easily causing pipe bursts. The substandard water quality leads to corrosion of the economizer pipe wall and changes in thermal stress, which in turn causes cracks and pipe bursts. Therefore, it is necessary to conduct safety monitoring of the economizer.

[0004] The existing patent (CN216081910U) is a low-temperature economizer leakage monitoring device, which includes an economizer body and a monitoring component arranged on the surface of the economizer body. The monitoring component includes a smoke exhaust pipe, a rubber ring, an airtight ring, a monitor and an alarm. Through the airtight ring and the monitor arranged on the monitoring component, the device can make the smoke leaked between the economizer body and the smoke exhaust pipe pass through the airtight ring and be effectively retained inside the airtight ring, and finally detect and alarm through contact with the monitor.

[0005] This technical solution is helpful to prevent further leakage of gas when it leaks, and at the same time can ensure that the monitor can effectively connect with the leaked gas, ensuring the accuracy of the monitor's operation. By pulling the pull ring on the reinforcement component, it is helpful to make the connection between the airtight ring and the monitor and the smoke exhaust pipe tighter, and at the same time make the connection between the smoke exhaust pipe and the economizer body more stable. However, this technical solution can only detect leaks in the pipeline.

[0006] The existing patent (CN112923349A) discloses a method for dynamically monitoring fouling of a low-temperature economizer of a coal-fired boiler, comprising the following steps: obtaining the clean state heat transfer coefficient of each heat exchange module, obtaining the fluid state data and flue gas state data of each heat exchange module in real time; calculating the real-time heat transfer coefficient based on the fluid state data and flue gas state data; calculating the clean factor based on the clean state heat transfer coefficient and the real-time heat transfer coefficient. A system for dynamically monitoring fouling of a low-temperature economizer of a coal-fired boiler comprises one or more heat exchange modules, each of which is provided with a data acquisition device, and the data acquisition device is electrically connected to a data processing device; the data acquisition device is used to acquire the fluid state data and flue gas state data of the heat exchange module; the data processing device calculates the real-time heat transfer coefficient based on the data acquired by the data acquisition device, and then calculates the clean factor used to represent the degree of influence of fouling on heat transfer in combination with the clean state heat transfer coefficient.

[0007] This technical solution can dynamically monitor the accumulation value of boiler scale, but the monitoring method is relatively complicated, so a new safety monitoring device is needed. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present invention provides an energy-saving boiler safety monitoring device, which solves the problem in the above background technology that the monitoring of parameters affecting the safe operation of the boiler is relatively complex.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: an energy-saving boiler safety monitoring device, including an economizer, wherein the liquid inlet and liquid outlet ends of the economizer are both provided with liquid temperature flow rate sensors, the air inlet end of the economizer is provided with a gas temperature flow rate sensor, the liquid inlet end of the economizer is connected to and penetrated with a water pump, the water pump is located in front of the liquid temperature flow rate sensor, a cooling mechanism is provided on one side of the economizer, the air inlet end of the cooling mechanism is connected and penetrated with the air inlet end of the economizer through an electromagnetic air inlet tee, the exhaust end of the cooling mechanism is connected and penetrated with the output end of the economizer through an electromagnetic exhaust tee, the gas temperature flow rate sensor is also provided at the exhaust end of the electromagnetic exhaust tee, the gas temperature flow rate sensor, the liquid temperature flow rate sensor, the gas temperature flow rate sensor, the electromagnetic exhaust tee, the electromagnetic exhaust tee and the water pump are connected through a processor control, and the processor includes a storage, a temporary register and a data analysis unit.

[0010] Preferably, the cooling mechanism comprises a water tank half filled with water, an air inlet end of the water tank extends below the liquid level of the water tank, and an air outlet end of the water tank is located above the liquid level.

[0011] Preferably, a serpentine-shaped cooling pipe is arranged inside the water tank, the air inlet end of the cooling pipe is connected to and penetrates a solenoid valve controlled by a processor, the other end of the solenoid valve is connected to and penetrates a liquid nitrogen bottle filled with liquid nitrogen, and the air outlet end of the cooling pipe is located above the liquid level of the air inlet end of the water tank.

[0012] The economizer monitors the inlet water quality in the following way:

[0013] The flow rates at the liquid inlet and outlet of the economizer are collected in real time, and the flow rate difference is collected periodically, and the absolute values ​​of the two flow rate difference increments are taken and added to determine the flow rate increment coefficient;

[0014] The temperatures of the liquid inlet and outlet of the economizer are collected in real time, and the temperature difference is collected periodically to compare whether the flow rate difference and the temperature difference are negatively correlated. If they are negatively correlated, the flow rate difference and the temperature difference are recorded at zero time and permanently.

[0015] A preset comparison value is set, and the comparison increment coefficient is compared with the preset value. When the increment coefficient is greater than the preset value, the boiler inlet water quality is detected, and the zero-time recording value is cleared after the detection.

[0016] The economizer monitors whether the boiler combustion is sufficient in the following way:

[0017] The flow velocities at the air inlet and outlet of the economizer are collected in real time, and the flow velocity difference is collected periodically, and the absolute values ​​of the two flow velocity difference increments are taken and added to determine the flow velocity increment coefficient;

[0018] The temperatures at the air inlet and outlet of the economizer are collected in real time, and the temperature difference is collected periodically to compare whether the flow rate difference and the temperature difference are negatively correlated. If they are negatively correlated, the flow rate difference and the temperature difference are recorded at zero time and permanently.

[0019] A preset comparison value is set, and the comparison increment coefficient is compared with the preset value. When the increment coefficient is greater than the preset value, the boiler combustion condition is detected, and the zero-time recording value is cleared after the detection.

[0020] The method for monitoring the blockage of the flow channel of the economizer is:

[0021] The difference between the flow rate at the liquid outlet end and the flow rate at the liquid inlet end of the economizer is detected, and when the difference reaches a preset cleaning value, a reminder is given to clean the liquid flow end of the economizer.

[0022] The economizer monitoring and cleaning method is as follows:

[0023] The difference between the flow rate at the air outlet and the air inlet of the economizer is detected, and when the difference reaches a preset cleaning value, a reminder is given to clean the economizer.

[0024] The method for monitoring whether leakage occurs in the liquid flow section of the economizer is as follows:

[0025] The flow rate values ​​at the liquid inlet and outlet ends of the economizer are detected in real time. When the flow rate at the liquid inlet end remains unchanged and the flow rate at the liquid outlet end decreases, the water pump is turned off, the electromagnetic air inlet tee and the electromagnetic exhaust tee are switched to connect with the cooling mechanism, and a reminder is given to find leaks in the liquid flow section of the economizer.

[0026] The economizer monitors whether leakage occurs in the gas flow section in the following manner:

[0027] The flow rate values ​​at the air inlet and outlet ends of the economizer are detected in real time. When the flow rate at the air inlet end remains unchanged and the flow rate at the air outlet end decreases, the water pump is turned off, the electromagnetic air inlet tee and the electromagnetic exhaust tee are switched to connect with the cooling mechanism, and a reminder is given to find leaks in the air flow section of the economizer.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The energy-saving boiler safety monitoring device is equipped with liquid temperature flow rate sensors at the liquid inlet and liquid outlet, and gas temperature flow rate sensors at the gas inlet and gas outlet. By detecting the liquid flow rate difference and the gas flow rate difference, the device can detect the water quality change, combustion change, leakage and other parameter changes that affect the safe operation of the energy-saving boiler, thereby ensuring the safe operation of the energy-saving boiler.

[0030] 2. The energy-saving boiler safety monitoring device has a cooling mechanism including a water tank half-filled with water. The air inlet end of the water tank extends below the liquid level of the water tank, and the air outlet end of the water tank is located above the liquid level. The boiler exhaust gas can be cooled in the water tank and the remaining sparks can be extinguished.

[0031] 3. The energy-saving boiler safety monitoring device has a serpentine cooling pipe inside the water tank. The air inlet end of the cooling pipe is connected to and penetrated by a solenoid valve controlled by a processor. The other end of the solenoid valve is connected to and penetrated by a liquid nitrogen bottle filled with liquid nitrogen. The air outlet end of the cooling pipe is located above the liquid level at the air inlet end of the water tank. By setting liquid nitrogen, the cooling time of the water tank can be extended. At the same time, the discharged nitrogen will not react in the combustion exhaust gas, thereby providing a buffer for maintenance, thereby reserving sufficient maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 A half-section schematic diagram of the cooling mechanism of the present invention;

[0034] Figure 3 The process of the present invention is shown in FIG.

[0035] In the figure: 1. economizer; 2. liquid temperature flow rate sensor; 3. gas temperature flow rate sensor; 4. water pump; 5. cooling mechanism; 6. electromagnetic air inlet tee; 7. electromagnetic exhaust tee; 8. processor; 801. storage; 802. temporary register; 803. data analysis unit; 501. water tank; 502. cooling pipe; 503. solenoid valve; 504. liquid nitrogen bottle. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] like Figure 1-3As shown, an energy-saving boiler safety monitoring device includes an economizer 1, wherein the liquid inlet and liquid outlet ends of the economizer 1 are both provided with liquid temperature flow rate sensors 2, the air inlet end of the economizer 1 is provided with a gas temperature flow rate sensor 3, the liquid inlet end of the economizer 1 is connected to and penetrated with a water pump 4, the water pump 4 is located in front of the liquid temperature flow rate sensor 2, a cooling mechanism 5 is provided on one side of the economizer 1, the air inlet end of the cooling mechanism 5 is connected and penetrated with the air inlet end of the economizer 1 through an electromagnetic air inlet tee 6, the exhaust end of the cooling mechanism 5 is connected and penetrated with the output end of the economizer 1 through an electromagnetic exhaust tee 7, the gas temperature flow rate sensor 3 is also provided at the exhaust end of the electromagnetic exhaust tee 7, the gas temperature flow rate sensor 2, the liquid temperature flow rate sensor 2, the gas temperature flow rate sensor 3, the electromagnetic exhaust tee 7, the electromagnetic exhaust tee 7 and the water pump 4 are controlled and connected through a processor 8, and the processor 8 includes a storage 801, a temporary register 802 and a data analysis unit 803.

[0041] The cooling mechanism 5 includes a water tank 501 half filled with water, the air inlet end of the water tank 501 extends below the liquid level of the water tank 501, and the air outlet end of the water tank 501 is located above the liquid level. The boiler exhaust gas can be cooled in the water tank 501 and the remaining sparks can be extinguished.

[0042] A serpentine cooling pipe 502 is arranged inside the water tank 501, and the air inlet end of the cooling pipe 502 is connected to and penetrated by a solenoid valve 503 controlled by the processor 8, and the other end of the solenoid valve 503 is connected to and penetrated by a liquid nitrogen bottle 504 filled with liquid nitrogen, and the air outlet end of the cooling pipe 502 is located above the liquid level of the air inlet end of the water tank 501. By arranging liquid nitrogen, the cooling time of the water tank 501 can be extended, and the discharged nitrogen will not react in the combustion exhaust gas, thereby providing a buffer for maintenance, thereby reserving sufficient maintenance time.

[0043] Economizer 1 monitors the inlet water quality in the following ways:

[0044] The flow rates at the liquid inlet and outlet of economizer 1 are collected in real time, and the flow rate difference is collected periodically. The absolute values ​​of the two flow rate difference increments are taken and added to determine the flow rate increment coefficient;

[0045] Collect the temperature of the liquid inlet and outlet of economizer 1 in real time, and periodically collect the temperature difference, compare the flow rate difference and the temperature difference to see if they are negatively correlated, and if so, record the flow rate difference and the temperature difference at zero time and permanently;

[0046] Preset the comparison value, compare the incremental coefficient with the preset value, and when the incremental coefficient is greater than the preset value, detect the water quality of the boiler inlet water, and clear the zero time record value after the detection. Due to the increase of dirt in the water quality inside the liquid flow end, the accumulation speed is constant when the water quality is normal, and the accumulation speed becomes faster when there is a problem with the water quality. The water inlet speed at the liquid flow end is constant, and the flow rate at the outlet end increases when scale increases.

[0047] Example:

[0048]

[0049] Economizer 1 monitors whether the boiler combustion is sufficient in the following ways:

[0050] The flow rates at the air inlet and outlet of economizer 1 are collected in real time, and the flow rate difference is collected periodically. The absolute values ​​of the two flow rate difference increments are taken and added to determine the flow rate increment coefficient;

[0051] Collect the temperature of the air inlet and outlet of economizer 1 in real time, and collect the temperature difference periodically, and compare whether the flow rate difference and the temperature difference are negatively correlated. If the liquid flow rate is faster, the heat exchange time is shorter, and the temperature rise will be lower. If it is negatively correlated, record the flow rate difference and temperature difference at zero time and permanently;

[0052] A preset comparison value is set, and the comparison increment coefficient is compared with the preset value. When the increment coefficient is greater than the preset value, the boiler combustion condition is detected, and the zero-time recording value is cleared after the detection.

[0053] The same applies to liquid flow section detection.

[0054] The way to monitor the blockage of the flow channel of economizer 1 is:

[0055] Detect the difference between the flow rate at the liquid outlet and the liquid inlet of economizer 1. When the difference reaches the preset cleaning value, it reminds you to clean the liquid flow end of economizer 1. The increase in the difference in the flow rate of the liquid flow section indicates that the internal blockage of the pipeline is aggravated, and cleaning is performed when the specified value is limited.

[0056] Economizer 1 monitoring and cleaning methods are:

[0057] The difference between the flow rate at the outlet end and the flow rate at the inlet end of economizer 1 is detected, and when the difference reaches a preset cleaning value, a reminder is given to clean economizer 1.

[0058] The way to monitor whether the liquid flow section of economizer 1 leaks is as follows:

[0059] The flow rate values ​​at the liquid inlet and outlet ends of the economizer 1 are detected in real time. When the flow rate at the liquid inlet end remains unchanged and the flow rate at the liquid outlet end decreases, the water pump 4 is turned off, the electromagnetic air inlet tee 6 and the electromagnetic exhaust tee 7 are switched to be connected with the cooling mechanism 5, and a reminder is given to find the leak point in the liquid flow section of the economizer 1. When a leak occurs at the liquid flow end, water is discharged from the leak point and the flow rate at the water outlet end is reduced.

[0060] The way for economizer 1 to monitor whether there is leakage in the air flow section is:

[0061] The flow rate values ​​at the air inlet and air outlet of the economizer 1 are detected in real time. When the flow rate at the air inlet remains unchanged and the flow rate at the air outlet decreases, the water pump 4 is turned off, the electromagnetic air inlet tee 6 and the electromagnetic exhaust tee 7 are switched to be connected with the cooling mechanism 5, and a reminder is given to find leaks in the air flow section of the economizer 1.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0063] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving boiler safety monitoring device, comprising an economizer (1), characterized in that: The liquid inlet end and the liquid outlet end of the economizer (1) are both provided with a liquid temperature flow rate sensor (2), the gas inlet end of the economizer (1) is provided with a gas temperature flow rate sensor (3), the liquid inlet end of the economizer (1) is connected to and penetrated by a water pump (4), and the water pump (4) is located in front of the liquid temperature flow rate sensor (2); A cooling mechanism (5) is provided on one side of the economizer (1); an air inlet end of the cooling mechanism (5) is connected and communicated with an air inlet end of the economizer (1) via an electromagnetic air inlet tee (6); an exhaust end of the cooling mechanism (5) is connected and communicated with an output end of the economizer (1) via an electromagnetic exhaust tee (7); and a gas temperature and flow rate sensor (3) is also provided at the exhaust end of the electromagnetic exhaust tee (7); The gas temperature flow rate sensor (2), the liquid temperature flow rate sensor (2), the gas temperature flow rate sensor (3), the electromagnetic exhaust tee (7), the electromagnetic exhaust tee (7) and the water pump (4) are connected and controlled by a processor (8); The processor (8) comprises a storage (801), a temporary memory (802) and a data analysis unit (803).

2. The energy-saving boiler safety monitoring device according to claim 1 is characterized in that: The economizer (1) monitors the inlet water quality in the following manner: The flow rates at the liquid inlet and the liquid outlet of the economizer (1) are collected in real time, and the flow rate difference is collected periodically, and the absolute values ​​of the two flow rate difference increments are taken and added to determine the flow rate increment coefficient; The temperatures of the liquid inlet and liquid outlet of the economizer (1) are collected in real time, and the temperature difference is collected periodically, and the flow velocity difference and the temperature difference are compared to see whether the range of change is negatively correlated. If the range of change is negatively correlated, the flow velocity difference and the temperature difference are recorded at zero time and permanently; A preset comparison value is set, and the comparison increment coefficient is compared with the preset value. When the increment coefficient is greater than the preset value, the boiler inlet water quality is detected, and the zero-time recording value is cleared after the detection.

3. The energy-saving boiler safety monitoring device according to claim 1 is characterized in that: The economizer (1) monitors whether the boiler combustion is sufficient in the following manner: The flow velocities at the air inlet and outlet of the economizer (1) are collected in real time, and the flow velocity difference is collected periodically, and the absolute values ​​of the two flow velocity difference increments are taken and added to determine the flow velocity increment coefficient; The temperatures of the air inlet and air outlet of the economizer (1) are collected in real time, and the temperature difference is collected periodically, and the flow velocity difference and the temperature difference are compared to see whether the range of change is negatively correlated. If the range of change is negatively correlated, the flow velocity difference and the temperature difference are recorded at zero time and permanently; A preset comparison value is set, and the comparison increment coefficient is compared with the preset value. When the increment coefficient is greater than the preset value, the boiler combustion condition is detected, and the zero-time recording value is cleared after the detection.

4. The energy-saving boiler safety monitoring device according to claim 1 is characterized in that: The economizer (1) monitors the blockage of the flow channel in the following manner: The difference between the flow rate at the liquid outlet end and the flow rate at the liquid inlet end of the economizer (1) is detected, and when the difference reaches a preset cleaning value, a reminder is given to clean the liquid flow end of the economizer (1).

5. The energy-saving boiler safety monitoring device according to claim 1 is characterized in that: The economizer (1) is monitored and cleaned in the following manner: The difference between the flow rate at the air outlet and the air inlet of the economizer (1) is detected, and when the difference reaches a preset cleaning value, a reminder is given to clean the economizer (1).

6. The energy-saving boiler safety monitoring device according to claim 1 is characterized in that: The economizer (1) monitors whether leakage occurs in the liquid flow section in the following manner: The flow rate values ​​at the liquid inlet and liquid outlet of the economizer (1) are detected in real time. When the flow rate at the liquid inlet remains unchanged and the flow rate at the liquid outlet decreases, the water pump (4) is turned off, the electromagnetic air inlet tee (6) and the electromagnetic air exhaust tee (7) are switched to be connected with the cooling mechanism (5), and a reminder is given to search for leaks in the liquid flow section of the economizer (1).

7. The energy-saving boiler safety monitoring device according to claim 1 is characterized in that: The economizer (1) monitors whether leakage occurs in the gas flow section in the following manner: The flow rate values ​​at the air inlet and air outlet of the economizer (1) are detected in real time. When the air inlet flow rate remains unchanged and the air outlet flow rate decreases, the water pump (4) is turned off, the electromagnetic air inlet tee (6) and the electromagnetic exhaust tee (7) are switched to be connected with the cooling mechanism (5), and a reminder is given to search for leaks in the air flow section of the economizer (1).

8. The energy-saving boiler safety monitoring device according to any one of claims 1, 6 or 7, characterized in that: The cooling mechanism (5) comprises a water tank (501) half filled with water, the air inlet end of the water tank (501) extends below the liquid level of the water tank (501), and the air outlet end of the water tank (501) is located above the liquid level.

9. The energy-saving boiler safety monitoring device according to any one of claim 8, characterized in that: A cooling pipe (502) distributed in a serpentine shape is arranged inside the water tank (501); an air inlet end of the cooling pipe (502) is connected to and penetrates a solenoid valve (503) controlled by a processor (8); the other end of the solenoid valve (503) is connected to and penetrates a liquid nitrogen bottle (504) filled with liquid nitrogen; and an air outlet end of the cooling pipe (502) is located above the liquid level of the air inlet end of the water tank (501).

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