Heat conduction oil boiler system capable of recovering waste heat

Abstract

The utility model discloses a heat conduction oil boiler system capable of recovering waste heat, which comprises a heat conduction oil boiler, a smoke return device and a waste heat recovery device, a burner is arranged on an air inlet of the heat conduction oil boiler, a smoke exhaust pipe and a chimney are sequentially arranged on a smoke exhaust port, the smoke return device is arranged between the smoke exhaust pipe and the burner, and the waste heat recovery device is arranged on the smoke exhaust pipe. The smoke return device is used for heating smoke of the smoke exhaust pipe and then guiding the smoke into the air inlet end of the combustor. The waste heat recovery device comprises a heat exchange coil and a water storage tank, the heat exchange coil is arranged in the smoke exhaust end of the chimney, a water inlet pipe connected with a tap water pipe is arranged at one end of the heat exchange coil, a water outlet pipe connected with the water storage tank is arranged at the other end of the heat exchange coil, and hot water in the water storage tank is used in other application scenes. According to the utility model, heat of flue gas entering the chimney part is recovered to form hot water or warm air for other application scenes, so that the waste heat recovery efficiency and performance are improved; and meanwhile, the temperature of return smoke entering the combustor can be accurately controlled through the smoke return device, and stable and reliable operation of the combustor and the boiler is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and in particular to a thermal oil boiler system with waste heat recovery capability. Background Technology

[0002] The flue gas emitted from the thermal oil boiler absorbs heat in the air preheater and is discharged to the chimney at a temperature of 40-50°C. Existing technologies do not effectively recover and utilize the waste heat of this part of the flue gas, resulting in a waste of thermal energy.

[0003] In addition, during actual use, the flue gas temperature through the FGR pipe and air preheater is too high, that is, the flue gas temperature exceeds the maximum temperature resistance of the burner, causing burner damage and affecting the normal operation of the boiler system.

[0004] Therefore, it is necessary to develop a thermal oil boiler system capable of waste heat recovery, which can recover the heat of flue gas entering the chimney to form hot water or heating for other applications, thereby improving the efficiency and performance of waste heat recovery; at the same time, it can precisely control the return flue gas temperature entering the burner to ensure the stable and reliable operation of the burner and boiler. Utility Model Content

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A thermal oil boiler system with waste heat recovery capability includes a thermal oil boiler, a flue gas return device, and a waste heat recovery device. The system is characterized in that a burner is installed at the air inlet of the thermal oil boiler, and a flue gas pipe and a chimney are installed sequentially at the flue gas outlet. A flue gas return device is installed between the flue gas pipe and the burner. The flue gas return device is used to heat the flue gas from the flue gas pipe and then introduce it into the burner.

[0007] The waste heat recovery device includes a heat exchange coil and a water storage tank. The heat exchange coil is installed inside the flue gas exhaust end of the chimney. One end of the heat exchange coil is provided with an inlet pipe connected to a tap water pipe, and the other end is provided with an outlet pipe connected to the water storage tank. The hot water in the water storage tank is used for other application scenarios.

[0008] Preferably, the water inlet end of the heat exchange coil is provided with an extension section extending towards the ground, and a vibrator is provided on the extension section.

[0009] Preferably, the waste heat recovery device further includes an indoor fan, an air inlet pipe is provided on the water inlet pipe, a warm air pipe connected to the air inlet end of the fan is provided on the water outlet pipe, and a drain pipe is provided at the end of the water inlet pipe near the tap water pipe.

[0010] The water inlet pipe and the air inlet pipe are respectively equipped with a first valve and a second valve, the water outlet pipe is equipped with a third valve at the end near the water storage tank, the heating air pipe is equipped with a fourth valve, and the drain pipe is equipped with a fifth valve.

[0011] Preferably, the heat exchange coil is welded or bolted to the chimney.

[0012] Preferably, the flue gas return device includes a blower, an air preheater, and an FGR pipe. The air preheater is installed on the exhaust pipe. The air inlet of the blower is connected to the exhaust pipe through the FGR pipe, and the air outlet of the blower is connected to the air inlet of the air preheater through a guide pipe. The air inlet of the burner is connected to the hot air outlet of the air preheater through the flue gas return pipe.

[0013] Preferably, the flue gas return device further includes a bypass pipe, the two ends of which are connected to the air duct and the flue gas return pipe respectively. A sixth valve is provided on the bypass pipe, and a temperature sensor is provided at the end of the flue gas return pipe near the burner.

[0014] Preferably, the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are solenoid valves.

[0015] Preferably, an air filter is provided on the air inlet pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model improves the efficiency and performance of waste heat recovery by installing a heat exchange coil inside the flue gas exhaust end of the chimney to recover the heat of the flue gas entering the chimney and form hot water or heating for other application scenarios.

[0018] 2. By installing a bypass pipe between the air duct and the return flue pipe, the return flue temperature entering the burner is precisely controlled under the combined action of the temperature sensor and the sixth valve, thereby preventing excessive flue gas from damaging the burner and ensuring the stable and reliable operation of the burner and boiler. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] The components include: 1. Thermal oil boiler; 2. Burner; 3. Heat exchange coil; 4. Water storage tank; 5. Vibrator; 6. Fan; 7. Air preheater; 8. FGR pipe; 9. Bypass pipe; 11. Temperature sensor; 12. Air filter; 13. Blower; 31. Extension section; 10. Exhaust pipe; 20. Chimney; 30. Water supply pipe; 40. Inlet pipe; 50. Outlet pipe; 60. Air inlet pipe; 70. Heater pipe; 80. Drainage pipe; 90. Air duct; 100. Return flue pipe; 1a. First valve; 2a. Second valve; 3a. Third valve; 4a. Fourth valve; 5a. Fifth valve; 6a. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0025] like Figure 1 As shown, a thermal oil boiler system with waste heat recovery includes a thermal oil boiler 1, a flue gas return device and a waste heat recovery device. A burner 2 is installed on the air inlet of the thermal oil boiler 1, and a flue gas pipe 10 and a chimney 20 are installed sequentially on the flue gas outlet. A flue gas return device is installed between the flue gas pipe 10 and the burner 2. The flue gas return device is used to heat the flue gas from the flue gas pipe 10 and then introduce it into the burner 2.

[0026] The waste heat recovery device includes a heat exchange coil 3 and a water storage tank 4. The heat exchange coil 3 is installed inside the exhaust end of the chimney 20. One end of the heat exchange coil 3 is provided with an inlet pipe 40 connected to a tap water pipe 30, and the other end is provided with an outlet pipe 50 connected to the water storage tank 4. The hot water in the water storage tank 4 is used for other application scenarios.

[0027] In this embodiment, by installing a heat exchange coil 3 inside the exhaust end of the chimney 20, tap water absorbs the heat of the flue gas inside the chimney 20 during the flow of the heat exchange coil 3, forming hot water which is then stored in the water storage tank 4 and then used in other application scenarios (including processing processes or indoor places that require heating or hot water), especially in cases where hot water is urgently needed in winter, thereby improving the waste heat recovery efficiency and performance of the boiler system.

[0028] Furthermore, such as Figure 1 As shown, in order to effectively remove the dust accumulated on the surface of the heat exchange coil 3, improve the heat exchange effect, and extend the service life of the heat exchange coil 3, the water inlet end of the heat exchange coil 3 is provided with an extension section 31 extending towards the ground, and a vibrator 5 is provided on the extension section 31; in addition, the extension section 31 is provided so that the vibrator 5 is placed in the low temperature area of ​​the chimney 20 to avoid damage to the vibrator 5.

[0029] Furthermore, such as Figure 1 As shown, the waste heat recovery device also includes a fan 6 installed indoors, an air inlet pipe 60 is installed on the water inlet pipe 40, a warm air pipe 70 connected to the air inlet end of the fan 6 is installed on the water outlet pipe 50, and a drain pipe 80 is installed at the end of the water inlet pipe 40 near the tap water pipe 30.

[0030] The water inlet pipe 30 and the air inlet pipe 60 are respectively equipped with a first valve 1a and a second valve 2a, the water outlet pipe 50 is equipped with a third valve 3a at the end near the water storage tank 4, the warm air pipe 70 is equipped with a fourth valve 4a, and the drain pipe 80 is equipped with a fifth valve 5a.

[0031] In this embodiment, when hot water is needed, the fifth valve 5a, the second valve 2a, and the fourth valve 4a are closed, while the first valve 1a and the third valve 3a are opened. Tap water enters the heat exchange coil 3 through the inlet pipe 40 to absorb heat, forming hot water which is then discharged through the outlet pipe 50 into the storage tank 4. When heating is needed, the first valve 1a and the third valve 3a are closed, and then the fifth valve 5a is opened to drain the water from the heat exchange coil 3. After drainage is completed, the fifth valve 5a is closed, and then the second valve 2a and the fourth valve 4a are opened. The fan 6 is started, and air enters the heat exchange coil 3 to form hot air flowing into the room. This achieves the conversion of the heat from the flue gas into the required hot water or heating, meeting the needs of different application scenarios and improving the efficiency and performance of waste heat recovery.

[0032] Furthermore, the heat exchange coil 3 is welded or bolted to the chimney 20.

[0033] Furthermore, such as Figure 1As shown, the flue gas return device includes a blower 13, an air preheater 7, and an FGR pipe 8. The air preheater 7 is installed on the exhaust pipe 10. The air inlet of the blower 13 is connected to the exhaust pipe 10 through the FGR pipe 8, and the air outlet is connected to the air inlet of the air preheater 7 through the air guide pipe 90. The air inlet of the burner 2 is connected to the hot air outlet of the air preheater 7 through the flue gas return pipe 100.

[0034] In this embodiment, under the action of blower 13, air mixes with flue gas introduced by FGR pipe 8 and enters air duct 90. After being heated by air preheater 7, it forms flue gas with a higher temperature. Then, the flue gas enters the burner through return flue pipe 100, thereby increasing the combustion intake temperature, reducing energy consumption, and allowing unburned nitrogen oxides to be burned in the furnace, reducing nitrogen oxide emissions and achieving energy saving and environmental protection.

[0035] Furthermore, such as Figure 1 As shown, in order to prevent the temperature of the flue gas from being too high and to ensure the stability of the flue gas temperature, the flue gas return device also includes a bypass pipe 9. The two ends of the bypass pipe 9 are connected to the air duct 90 and the flue gas return pipe 100, respectively. A sixth valve 6a is provided on the bypass pipe 9, and a temperature sensor 11 is provided at the end of the flue gas return pipe 100 near the burner 2.

[0036] During operation, when the temperature sensor 11 detects that the temperature of the flue gas is higher than the set value, the sixth valve 6a is opened to introduce the lower temperature mixed gas (flue gas + air) into the flue gas return pipe 100, thereby reducing the temperature of the flue gas. During the process, the opening degree of the sixth valve 6a can be controlled to achieve precise control of the flue gas temperature, prevent excessively high flue gas from damaging the burner 2, and ensure the stable and reliable operation of the burner 2 and the boiler.

[0037] Furthermore, the first valve 1a, the second valve 2a, the third valve 3a, the fourth valve 4a, and the fifth valve 5a are solenoid valves.

[0038] In this embodiment, each of the valves is a solenoid valve. Solenoid valves have advantages such as fast response speed, good stability, and strong controllability, which greatly improves the stability of the on / off control of each pipeline.

[0039] Furthermore, such as Figure 1 As shown, in order to prevent dust in the air from entering the heat exchange coil 3 and to improve the heating quality, an air filter 12 is installed on the air inlet pipe 60.

[0040] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model patent.

Claims

1. A thermal oil boiler system with waste heat recovery capability, comprising a thermal oil boiler, a flue gas return device, and a waste heat recovery device, characterized in that, The thermal oil boiler is equipped with a burner at the air inlet and a flue pipe and a chimney at the flue outlet. A flue gas return device is provided between the flue pipe and the burner. The flue gas return device is used to heat the flue gas from the flue pipe and then introduce it into the burner. The waste heat recovery device includes a heat exchange coil and a water storage tank. The heat exchange coil is installed inside the flue gas exhaust end of the chimney. One end of the heat exchange coil is provided with an inlet pipe connected to a tap water pipe, and the other end is provided with an outlet pipe connected to the water storage tank. The hot water in the water storage tank is used for other application scenarios.

2. The thermal oil boiler system with waste heat recovery capability according to claim 1, characterized in that, The heat exchange coil has an extension section extending towards the ground at its water inlet end, and a vibrator is installed on the extension section.

3. The thermal oil boiler system with waste heat recovery capability according to claim 1, characterized in that, The waste heat recovery device also includes an indoor fan, an air inlet pipe is provided on the water inlet pipe, a warm air pipe connected to the air inlet end of the fan is provided on the water outlet pipe, and a drain pipe is provided at the end of the water inlet pipe near the tap water pipe. The water inlet pipe and the air inlet pipe are respectively equipped with a first valve and a second valve, the water outlet pipe is equipped with a third valve at the end near the water storage tank, the heating air pipe is equipped with a fourth valve, and the drain pipe is equipped with a fifth valve.

4. The thermal oil boiler system with waste heat recovery capability according to claim 1, characterized in that, The heat exchange coil is welded or bolted to the chimney.

5. A thermal oil boiler system with waste heat recovery capability according to claim 1, characterized in that, The flue gas return device includes a blower, an air preheater, and an FGR pipe. The air preheater is installed on the exhaust pipe. The air inlet of the blower is connected to the exhaust pipe through the FGR pipe, and the air outlet is connected to the air inlet of the air preheater through a guide pipe. The air inlet of the burner is connected to the hot air outlet of the air preheater through the flue gas return pipe.

6. A thermal oil boiler system with waste heat recovery capability according to claim 5, characterized in that, The flue gas return device also includes a bypass pipe, the two ends of which are connected to the air duct and the flue gas return pipe, respectively. A sixth valve is installed on the bypass pipe, and a temperature sensor is installed at the end of the flue gas return pipe near the burner.

7. A thermal oil boiler system with waste heat recovery capability according to claim 3, characterized in that, The first valve, the second valve, the third valve, the fourth valve, and the fifth valve are solenoid valves.

8. A thermal oil boiler system with waste heat recovery capability according to claim 3, characterized in that, An air filter is installed on the air inlet pipe.

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