Device for improving boiler flue gas heat recovery efficiency

Abstract

The utility model discloses a device for improving boiler flue gas heat recovery efficiency, which comprises an energy saver connected with a boiler; the first conveying assembly is connected with the inlet end of the energy saver and used for conveying the soft water to the energy saver for heat exchange; the inlet end of the hot water tank is communicated with the outlet end of the energy saver, and the hot water tank is used for supplying water to the boiler; the second conveying assembly is connected with the inlet end of the energy saver and the outlet end of the hot water tank and used for conveying part of hot water in the hot water tank into the energy saver; the monitoring element is arranged in the hot water tank and used for monitoring the water volume or the liquid level of the hot water tank; and the control element is in signal connection with the monitoring element, and when the water amount or the liquid level of the hot water tank exceeds a preset value, the control element controls the first conveying assembly to stop and the second conveying assembly to start. According to the device, heat exchange in the energy saver is continuously carried out while the overflow condition of the hot water tank is avoided, effective utilization of high temperature of boiler flue gas is guaranteed, the exhaust gas temperature of the boiler is reduced, and the heat recovery efficiency of the boiler flue gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, and more particularly to a device for improving the heat recovery efficiency of boiler flue gas. Background Art

[0002] Boiler exhaust temperature is one of the indicators to measure whether the boiler is in economical operation. The higher the exhaust temperature, the lower the efficiency of the boiler. How to reduce the exhaust temperature of the boiler has always been a research hotspot for technicians in the field.

[0003] In the related art, soft water is pumped into the economizer to exchange heat with the high-temperature flue gas, and the soft water after heat exchange is transported to the hot water tank for use. In actual circumstances, the hot water tank needs to avoid overflow. If the water level in the hot water tank is too high, the component that needs to pump soft water will stop working, and the heat exchange intensity in the economizer will gradually weaken or even disappear. Therefore, the heat generated by the high-temperature flue gas is not fully recovered and utilized, resulting in waste of resources.

[0004] In summary, how to fully utilize the heat generated by high-temperature flue gas is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a device for improving the heat recovery efficiency of boiler flue gas, while avoiding overflow of the hot water tank, so that the heat exchange in the economizer can continue, ensuring the effective utilization of the heat generated by the high temperature of the boiler flue gas, increasing the boiler feed water temperature, and reducing the boiler exhaust temperature.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A device for improving the heat recovery efficiency of boiler flue gas, comprising:

[0008] Economizer, for connection to boiler;

[0009] a first conveying assembly connected to the inlet end of the economizer and used to convey soft water to the economizer for heat exchange;

[0010] a hot water tank, the inlet end of the hot water tank being in communication with the outlet end of the economizer and being used for supplying water to the boiler;

[0011] a second conveying assembly, connected to the inlet end of the economizer and the outlet end of the hot water tank, for conveying part of the hot water in the hot water tank to the economizer;

[0012] A monitoring element, provided in the hot water tank, for monitoring the water volume or liquid level of the hot water tank;

[0013] A control element, whose signal is connected to the monitoring element, controls the first conveying component to stop and the second conveying component to start when the water volume or liquid level of the hot water tank exceeds a preset value.

[0014] Preferably, the first conveying assembly includes:

[0015] water softener;

[0016] a soft water tank, connected to the water softener;

[0017] The first delivery pump is provided between the soft water tank and the inlet end of the economizer. The control element signal is connected to the first delivery pump to control the start and stop of the first delivery pump.

[0018] Preferably, a first delivery pipeline is provided between the soft water tank and the inlet end of the economizer, and the first delivery pump is connected to the first delivery pipeline.

[0019] Preferably, the second conveying assembly includes:

[0020] a second delivery pipeline, communicating the outlet end of the hot water tank with the inlet end of the economizer;

[0021] The second delivery pump is connected to the second delivery pipeline and the hot water tank, and the control element information is connected to the second delivery pump to control the start and stop of the second delivery pump.

[0022] Preferably, the second delivery pipeline and the first delivery pipeline are both connected to the economizer through a main pipeline, and the main pipeline, the second delivery pipeline and the first delivery pipeline are all provided with switch components for opening and closing the pipelines, and the switch component signals are connected to the control element.

[0023] Preferably, the main line is provided with a flow monitor, and the control element signal is connected to the flow monitor to determine the operating conditions of the second delivery pump and the first delivery pump;

[0024] The control element is connected to an alarm, and the control element is used to control the operation of the alarm according to the operation conditions of the second delivery pump and the first delivery pump.

[0025] Preferably, two second delivery pumps are arranged in parallel, and both of the two second delivery pumps are connected to the main pipeline.

[0026] Preferably, the hot water tank is provided with a first outlet and a second outlet, the first outlet is used to connect to the boiler to realize water supply, and the second outlet is connected to the second delivery pipeline to realize the delivery of hot water in the hot water tank to the energy saver.

[0027] Preferably, the first outlet is connected to a deaerator pump, a deaerator, and a boiler feed pump in sequence, and the boiler feed pump is used to connect to the boiler to deliver the deoxygenated hot water to the boiler.

[0028] Preferably, the control element is installed in a control cabinet, the control cabinet is provided with a display screen, and the control element is connected to the display screen via a line.

[0029] The utility model provides a device for improving the heat recovery efficiency of boiler flue gas, comprising an economizer, a hot water tank, a first conveying assembly, a second conveying assembly, a monitoring element, and a control element. The economizer and the boiler are connected, specifically through a flue, and the connection between the two is used to discharge the flue gas generated by the boiler. The first conveying assembly is connected to the inlet end of the economizer and is used to deliver soft water to the economizer for heat exchange, thereby utilizing the flue gas generated by the boiler. The inlet end of the hot water tank is connected to the outlet end of the economizer. After the soft water exchanges heat in the economizer, it is further supplied to the boiler through the hot water tank to utilize the high temperature of the flue gas. The second conveying assembly is connected to the inlet end of the economizer and the outlet end of the hot water tank. When the monitoring element detects that the water volume or liquid level in the hot water tank reaches a preset value, the control element controls the second conveying assembly to operate and controls the first conveying assembly to stop. The second conveying assembly operates to deliver part of the hot water in the hot water tank to the economizer. The hot water delivered to the economizer can be used for heat exchange again to further utilize the heat generated by the high temperature of the flue gas, thereby achieving full and effective utilization of the heat. By directing the water in the hot water tank to the economizer, overflow of the hot water tank is avoided, thereby avoiding waste of resources.

[0030] The beneficial effects of the present invention are: controlling the operation of the first conveying assembly and the second conveying assembly according to the water volume or liquid level of the hot water tank, avoiding overflow of the hot water tank while allowing heat exchange in the economizer to continue, ensuring effective utilization of the high temperature of the boiler flue gas, and reducing the boiler exhaust temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the structure of a device for improving the heat recovery efficiency of boiler flue gas provided by the utility model.

[0033] Figure 1 , the reference numerals include:

[0034] 01-first conveying component; 02-second conveying component; 1-boiler; 2-economizer; 3-hot water tank; 4-soft water tank; 5-first conveying pump; 6-first conveying pipeline; 7-second conveying pipeline; 8-second conveying pump; 9-deaerator pump; 10-water softener; 11-deaerator; 12-boiler feed water pump; 13-main pipeline. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The core of this utility model is to provide a device to improve the heat recovery efficiency of boiler flue gas, avoid the overflow of the hot water tank while allowing the heat exchange in the economizer to continue, ensure the full and effective utilization of the heat generated by the high temperature of the boiler flue gas, increase the boiler feed water temperature, and reduce the boiler exhaust temperature.

[0037] The utility model provides a device for improving the heat recovery efficiency of boiler flue gas, which improves the temperature of water supplied to the boiler by improving the heat recovery efficiency of boiler flue gas. The schematic diagram of the device is shown in FIG. Figure 1 shown.

[0038] The device for improving the heat recovery efficiency of boiler flue gas specifically includes an economizer 2, a first conveying component 01, a second conveying component 02, a hot water tank 3, a monitoring element, and a control element.

[0039] The economizer 2 is connected to the boiler 1 and is used to cool the high-temperature flue gas generated by the boiler 1 to a certain temperature through the flue after heat exchange and then discharge it.

[0040] The first conveying component 01 is connected to the inlet end of the economizer 2, and the outlet end of the economizer 2 is connected to the inlet end of the hot water tank 3. The first conveying component 01 delivers soft water to the economizer 2 for heat exchange. After the heat exchange, the temperature of the soft water rises and is delivered to the hot water tank 3, and is connected to the boiler 1 through the hot water tank 3 to realize water supply. In this process, the heat of the high-temperature flue gas generated by the boiler 1 is utilized through the heat exchange with the soft water.

[0041] In the process of transporting soft water to the economizer 2 through the first conveying component 01, the soft water is heated by the economizer 2 and then sent to the hot water tank 3. As the first conveying component 01 operates, overflow may occur in the hot water tank 3, resulting in a waste of resources. To avoid this situation, a second conveying component 02 is set between the economizer 2 and the hot water tank 3.

[0042] Specifically, a monitoring element disposed within the hot water tank 3 monitors the water level or liquid level in the hot water tank 3. Both the water level and the liquid level provide feedback on whether the hot water tank 3 is likely to overflow. The monitoring element transmits the monitoring information to the control element, which, based on the monitoring information, determines whether the water level or liquid level in the hot water tank 3 exceeds a preset value, thereby determining the operating status of the first conveying assembly 01 and the second conveying assembly 02.

[0043] Taking one embodiment as an example, if the water volume or liquid level in the hot water tank 3 does not exceed the preset value, the control element controls the first conveying component 01 to start and the second conveying component 02 to stop, and the soft water is continuously delivered to the economizer 2 through the first conveying component 01, so that the economizer 2 continuously performs heat exchange to utilize the heat of the high-temperature flue gas generated by the boiler 1.

[0044] Taking another embodiment as an example, if the water volume or liquid level in hot water tank 3 exceeds a preset value, indicating that hot water tank 3 may overflow in the next step, the control element controls the first conveying component 01 to stop and the second conveying component 02 to start. The first conveying component 01 stops to stop conveying hot water to hot water tank 3. The second conveying component 02 connects the inlet end of economizer 2 and the outlet end of hot water tank 3 to transfer some of the hot water in hot water tank 3 to economizer 2 to complete the transition. This prevents the water in hot water tank 3 from overflowing, while some of the hot water in hot water tank 3 is also supplied to boiler 1. By transferring the water from hot water tank 3 to economizer 2, overflow can be avoided. In addition, when the water in hot water tank 3 is conveyed to economizer 2 by the second conveying component 02, the temperature of the high-temperature flue gas in economizer 2 is relatively high, so the heat exchange process still occurs, realizing further utilization of the heat of the high-temperature flue gas.

[0045] It should be noted that when the first conveying component 01 is operating, the second conveying component 02 stops, and when the second conveying component 02 is operating, the first conveying component 01 starts. Therefore, for the economizer 2, the heat exchange inside it is a continuous process, which ensures the full and effective utilization of the heat of the high-temperature flue gas, increases the water supply temperature supplied from the hot water tank 3 to the boiler 1, achieves energy saving effects, and improves the efficiency of the boiler.

[0046] As a preferred embodiment, the economizer 2 is a two-stage economizer, which improves the energy utilization efficiency of the boiler and ensures energy-saving effects.

[0047] Through the cooperation of the first conveying component 01 and the second conveying component 02, the high-temperature flue gas can be fully exchanged with heat in the economizer 2. The temperature of the flue gas that has been fully exchanged with heat will be effectively reduced, and the reduced flue gas will be discharged through the outlet of the economizer 2 to meet the emission conditions.

[0048] In addition, a temperature detection element may be provided in the economizer 2 to detect and obtain the exhaust temperature, thereby ensuring that the exhaust temperature is within an allowable range and facilitating the technicians to remotely learn about the exhaust status.

[0049] Based on the above embodiment, the first conveying assembly 01 includes:

[0050] Water softener 10;

[0051] Soft water tank 4, connected to water softener 10;

[0052] The first delivery pump 5 is provided between the soft water tank 4 and the inlet end of the economizer 2 , and the control element signal is connected to the first delivery pump 5 to control the start and stop of the first delivery pump 5 .

[0053] Please refer to Figure 1 The first conveying component 01 includes a water softener 10 and a soft water tank 4 connected thereto. The water softener 10 is used to treat ordinary water into soft water and then store it in the soft water tank 4. The soft water stored in the soft water tank 4 is used to achieve the soft water volume required for heat exchange in the economizer 2.

[0054] A certain amount of soft water is stored in the soft water tank 4. The connection between the water softener 10 and the soft water tank 4 can be controlled by monitoring the amount of soft water. If the water level in the soft water tank 4 is insufficient, soft water is promptly replenished to the soft water tank 4 through the water softener 10 to ensure the continuity and reliability of the boiler water supply operation.

[0055] The first delivery pump 5 is positioned between the soft water tank 4 and the inlet of the economizer 2. Signals from the first delivery pump 5 to the control element are connected to control its start and stop. Specifically, when the water level or volume in the hot water tank 3 falls below a preset value, the control element controls the first delivery pump 5 to deliver soft water from the soft water tank 4 to the economizer 2. After heat exchange within the economizer 2, the soft water becomes hot water, utilizing the heat from the boiler flue gas. The resulting soft water is then delivered to the hot water tank 3 for use in the boiler 1.

[0056] On the basis of any of the above embodiments, a first delivery pipeline 6 is provided between the soft water tank 4 and the inlet end of the economizer 2 , and the first delivery pump 5 is connected to the first delivery pipeline 6 .

[0057] Please refer to Figure 1 The first delivery pump 5 is arranged on the first delivery pipeline 6. Specifically, the soft water in the soft water tank 4 is delivered to the first delivery pump 5 to be pressurized, and then pumped into the economizer 2 through the outlet of the first delivery pump 5 and the first delivery pipeline 6. The soft water delivered to the economizer 2 is subjected to cold and heat exchange.

[0058] In addition, the soft water in the soft water tank 4 is sent to the first delivery pump 5, and the pipeline between the soft water tank 4 and the first delivery pump 5 can be used to achieve water communication. Figure 1 shown.

[0059] On the basis of any of the above embodiments, the second delivery component 02 includes a second delivery pipeline 7 and a second delivery pump 8. Please refer to Figure 1 If the water volume or liquid level in the hot water tank 3 detected by the monitoring element exceeds a preset value, the control element controls the second conveying component 02 to operate and controls the first conveying component 01 to stop. Specifically, the control element controls the second conveying pump 8 of the second conveying component 02 to operate to pump part of the hot water in the hot water tank 3 into the economizer 2 to further perform heat exchange and prevent the hot water tank 3 from overflowing.

[0060] The second delivery pipeline 7 is connected to the outlet end of the hot water tank 3 and the inlet end of the economizer 2, so as to realize the water communication between the hot water tank 3 and the economizer 2.

[0061] The second delivery pump 8 is connected to the second delivery pipeline 7 and the hot water tank 3. The hot water in the hot water tank 3 is pressurized by the second delivery pump 8 and then delivered to the economizer 2 to perform heat exchange operation, thereby improving the utilization rate of the heat of the boiler high-temperature flue gas and avoiding overflow of the hot water tank 3.

[0062] The control element information is connected to the second delivery pump 8 to control the start and stop of the second delivery pump 8. Specifically, when the first delivery pump 5 is working, the second delivery pump 8 stops, and when the first delivery pump 5 stops, the second delivery pump 8 starts.

[0063] In this embodiment, the operating status of the first delivery pump 5 and the second delivery pump 8 can also be monitored and analyzed through the control element. If any component is damaged, the technical staff can be reminded in time to ensure the continuity of the heat exchange process in the economizer 2 and effectively utilize the heat generated by the high-temperature flue gas of the boiler.

[0064] Based on any of the above embodiments, the second delivery pipeline 7 and the first delivery pipeline 6 are both connected to the economizer 2 via the main pipeline 13, which is the component directly connected to the inlet of the economizer 2. The second delivery pipeline 7, the first delivery pipeline 6, and the main pipeline 13 can be connected using a two-way joint, and a seal can be provided in the two-way joint to ensure the sealing of the waterway. Alternatively, the main pipeline 13 can be provided with connection holes for the second delivery pipeline 7 and the first delivery pipeline 6, respectively, and the connection holes and the first delivery pipeline 6 are welded, and the connection holes and the second delivery pipeline 7 are also welded to ensure the sealing of the waterway.

[0065] The main pipeline 13, the second conveying pipeline 7, and the first conveying pipeline 6 are all equipped with switches for opening and closing the pipelines, and the switch signals are connected to the control components. The setting of the switches ensures that the second conveying assembly 02 and the first conveying assembly 01 do not interfere with each other.

[0066] Taking a specific implementation as an example, during the production and application of the boiler 1, the switch on the main line 13 remains open. If the monitoring element detects that the liquid level or water volume in the hot water tank 3 exceeds a preset value, the control element controls the switch on the second delivery line 7 to open and the second delivery pump 8 to start, and the switch on the first delivery line 6 to close and the first delivery pump 5 to stop, to ensure that the water in the soft water tank 4 will not flow into the economizer 2 when the second delivery pump 8 is started, and to ensure that only the second delivery pump 8 pumps the hot water in the hot water tank 3 into the economizer 2 for further heat exchange, thereby reliably avoiding overflow in the hot water tank 3.

[0067] On the basis of any of the above embodiments, the main line 13 is provided with a flow monitor, and the control element signal is connected to the flow monitor to determine the operating conditions of the second delivery pump 8 and the first delivery pump 5; if the flow rate monitored by the flow monitor does not reach the required value when the first delivery pump 5 is operating and the second delivery pump 8 is not operating, it means that the pumping speed of the first delivery pump 5 is not in compliance with the requirements or that the first delivery pump 5 is damaged; similarly, if the first delivery pump 5 is not operating and the second delivery pump 8 is operating, if the flow rate monitored by the flow monitor does not reach the required value, it means that the pumping speed of the second delivery pump 8 is not in compliance with the requirements or that the second delivery pump 8 is damaged.

[0068] The control element is connected to an alarm, and the control element is used to control the operation of the alarm according to the operating conditions of the second delivery pump 8 and the first delivery pump 5, so that technical personnel can know the operating conditions of the components in a timely manner and take relevant measures in a timely manner, such as adjusting the pumping speed or replacing the pump, to ensure the continuity of the heat exchange in the economizer 2, so as to effectively reduce the exhaust temperature.

[0069] Based on any of the above embodiments, two second delivery pumps 8 are provided in parallel, and both second delivery pumps 8 are connected to the main line 13. This is a redundant design. As mentioned above, if the flow monitor determines that one of the two second delivery pumps 8 is damaged during operation, the control element can control the operation of the other second delivery pump 8, ensuring that the hot water tank 3 does not overflow, avoiding resource waste and ensuring effective and full utilization of the flue gas heat.

[0070] As for the first delivery pumps 5 , two may be arranged in parallel to achieve a redundant design, thereby ensuring the continuous reliability of the soft water tank 4 supplying water to the economizer 2 .

[0071] Based on any of the above embodiments, Figure 1As shown, the hot water tank 3 is provided with a first outlet and a second outlet. The first outlet is used to connect to the boiler 1 to realize water supply. The water heated by the high-temperature flue gas in the economizer 2 enters the interior through the inlet of the hot water tank 3 and is supplied to the boiler 1 through the first outlet to realize effective utilization of the heat of the high-temperature flue gas; the second outlet is connected to the second delivery pipeline 7 to realize the delivery of hot water in the hot water tank 3 to the economizer 2, realize further effective utilization of the heat of the high-temperature flue gas, and avoid the occurrence of overflow in the hot water tank 3.

[0072] On the basis of any of the above embodiments, the first outlet is connected to the deaerator pump 9, the deaerator 11, and the boiler feed water pump 12 in sequence. The hot water in the hot water tank 3 is pumped to the deaerator 11 through the deaerator pump 9 for deoxygenation, and then sent to the boiler 1 through the boiler feed water pump 12 to send the deoxygenated hot water to the boiler 1. Through the deoxygenation operation of the boiler feed water, corrosion to the boiler 1 is avoided, the service life of the boiler 1 is improved, and the reliable performance of the boiler 1 is guaranteed.

[0073] Based on any of the above embodiments, the control element is installed in a control cabinet, the control cabinet is provided with a display screen, and the control element is connected to the display screen via a line. The display screen can display monitoring information of the monitoring element and the operating status of the first delivery pump 5 and the second delivery pump 8, so that technicians can understand the progress of the operation.

[0074] Taking a specific implementation as an example, the control element is a CPU (Central Processing Unit) module, which can collect signals from the monitoring elements and control the start and stop of the first delivery pump 5 and the second delivery pump 8.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The above describes in detail the device for improving boiler flue gas heat recovery efficiency provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A device for improving the heat recovery efficiency of boiler flue gas, characterized in that: include: an economizer (2) for connecting to the boiler (1); A first conveying assembly (01) is connected to the inlet end of the economizer (2) and is used to convey soft water to the economizer (2) for heat exchange; a hot water tank (3), the inlet end of the hot water tank (3) being in communication with the outlet end of the economizer (2) and being used for supplying water to the boiler (1); A second conveying assembly (02) is connected to the inlet end of the economizer (2) and the outlet end of the hot water tank (3), and is used to convey part of the hot water in the hot water tank (3) to the economizer (2); A monitoring element, provided in the hot water tank (3), for monitoring the water volume or liquid level in the hot water tank (3); A control element, whose signal is connected to the monitoring element, controls the first conveying component (01) to stop and the second conveying component (02) to start when the water volume or liquid level in the hot water tank (3) exceeds a preset value.

2. The device for improving boiler flue gas heat recovery efficiency according to claim 1, characterized in that: The first conveying component (01) comprises: Water softener (10); A soft water tank (4), connected to the water softener (10); The first delivery pump (5) is provided between the soft water tank (4) and the inlet end of the economizer (2), and the control element signal is connected to the first delivery pump (5) to control the start and stop of the first delivery pump (5).

3. The device for improving boiler flue gas heat recovery efficiency according to claim 2, characterized in that: A first delivery pipeline (6) is provided between the soft water tank (4) and the inlet end of the energy saver (2), and the first delivery pump (5) is connected to the first delivery pipeline (6).

4. The device for improving boiler flue gas heat recovery efficiency according to claim 2 or 3, characterized in that: The second conveying component (02) comprises: a second delivery pipeline (7) communicating with the outlet of the hot water tank (3) and the inlet of the energy saver (2); The second delivery pump (8) is connected to the second delivery pipeline (7) and the hot water tank (3), and the control element information is connected to the second delivery pump (8) to control the start and stop of the second delivery pump (8).

5. The device for improving boiler flue gas heat recovery efficiency according to claim 4, characterized in that: The second delivery pipeline (7) and the first delivery pipeline (6) are both connected to the economizer (2) via the main pipeline (13); the main pipeline (13), the second delivery pipeline (7), and the first delivery pipeline (6) are all provided with switch components for opening and closing the pipelines, and the switch component signals are connected to the control element.

6. The device for improving boiler flue gas heat recovery efficiency according to claim 5, characterized in that: The main line (13) is provided with a flow monitor, and the control element signal is connected to the flow monitor to determine the operating conditions of the second delivery pump (8) and the first delivery pump (5); The control element is connected to an alarm, and the control element is used to control the operation of the alarm according to the operating conditions of the second delivery pump (8) and the first delivery pump (5).

7. The device for improving boiler flue gas heat recovery efficiency according to claim 6, characterized in that: Two second delivery pumps (8) are arranged in parallel, and both of the two second delivery pumps (8) are connected to the main line (13).

8. The device for improving boiler flue gas heat recovery efficiency according to claim 7, characterized in that: The hot water tank (3) is provided with a first outlet and a second outlet, the first outlet being used to communicate with the boiler (1) to realize water supply, and the second outlet being connected to the second delivery pipeline (7) to realize delivery of hot water in the hot water tank (3) to the energy saver (2).

9. The device for improving boiler flue gas heat recovery efficiency according to claim 8, characterized in that: The first outlet is connected in sequence to a deaerator pump (9), a deaerator (11), and a boiler feed water pump (12); the boiler feed water pump (12) is used to connect to the boiler (1) to deliver deoxygenated hot water to the boiler (1).

10. The device for improving boiler flue gas heat recovery efficiency according to claim 1, characterized in that: The control element is installed in a control cabinet. The control cabinet is provided with a display screen. The control element is connected to the display screen via a line.

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