Tap water condensation type flue gas waste heat recovery device

Abstract

The utility model discloses a tap water condensation type flue gas waste heat recovery device which comprises a boiler body and a water tank, a heat exchange assembly is arranged between the boiler body and the water tank, and the heat exchange assembly comprises a flue gas exchange plate heat exchanger and a water tank heating plate heat exchanger. A water outlet of the smoke exchange plate heat exchanger and a water inlet of the water tank heating plate heat exchanger are connected with the same conveying guide pipe A through bolts; a seventh temperature sensor and a liquid level sensor are fixedly connected to the inner wall of one side of the water tank. A temperature sensor IV and a temperature probe are fixedly connected to the circumferential outer wall of the conveying conduit A; the inlet end of the smoke exchange plate type heat exchanger and a smoke outlet of the boiler body are connected with the same smoke pipeline. The flue gas waste heat recovery device realizes graded utilization and efficient recovery of flue gas waste heat, improves the recovery efficiency, saves energy, can effectively and greatly reduce the exhaust gas temperature, and is environment-friendly, simple in structure, low in maintenance cost and easy to popularize and apply.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery technology, and in particular to a tap water condensation type flue gas waste heat recovery device. Background Technology

[0002] In traditional industries, such as heating and cooling in gas-fired lithium bromide generator units and the operation of gas-fired boilers, the operation of the burners generates a large amount of flue gas containing high heat. If the high-temperature flue gas is directly discharged into the atmosphere, it will not only cause a huge waste of energy, but may also have a negative impact on the environment.

[0003] To address the aforementioned issues, a search revealed a Chinese patent application (No. 200320121674.4) disclosing a flue gas condensation waste heat recovery device, primarily composed of a condensing heat exchanger, chimney, flue, and auxiliary structures. This patent saves energy, improves thermal efficiency, and reduces pollutant emissions, and is applicable to oil / gas-fired hot water boilers and direct-fired turbines. However, the aforementioned patent still has the following shortcomings: while using a finned tube heat exchanger to achieve heat conversion with high-temperature flue gas, it suffers from low heat recovery efficiency and the inability to effectively and significantly reduce exhaust gas temperature. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a tap water condensation flue gas waste heat recovery device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tap water condensing flue gas waste heat recovery device includes a boiler body and a water tank. A heat exchange component is provided between the boiler body and the water tank. The heat exchange component includes a flue gas exchange plate heat exchanger and a water tank heating plate heat exchanger. The outlet of the flue gas exchange plate heat exchanger and the inlet of the water tank heating plate heat exchanger are connected by the same delivery pipe A through bolts.

[0007] A temperature sensor and a liquid level sensor are fixedly connected to one inner wall of the water tank.

[0008] As a further improvement of this utility model: a temperature sensor and a temperature probe are fixedly connected to the outer circumference of the delivery conduit A.

[0009] As a further embodiment of this utility model: the inlet end of the flue gas exchange plate heat exchanger and the flue gas outlet of the boiler body are connected to the same flue gas pipe, and a temperature sensor is fixedly connected to the outer circumference of the flue gas pipe.

[0010] The outlet end of the flue gas exchange plate heat exchanger is fixedly connected to a flue gas outlet, and a temperature sensor is fixedly connected to the outer circumference of the flue gas outlet.

[0011] As a further improvement of this utility model: the outlet end of the flue gas exchange plate heat exchanger is fixedly connected to an output water pipe, and a temperature sensor is fixedly connected to the outer circumference of the output water pipe.

[0012] As a further embodiment of this utility model: the inlet end of the water tank and the outlet of the water tank heating plate are connected by bolts to the same delivery conduit B, and a temperature sensor is fixedly connected to the outer circumference of the delivery conduit B.

[0013] As a further embodiment of this utility model: the inlet end of the flue gas exchange plate heat exchanger is fixedly connected to an input water pipe, one end of the input water pipe is connected to a first tee pipe through a flange, and the two ends of the first tee pipe are respectively connected to a return pipe and an external water pipe in the shape of 'b' through flanges.

[0014] One end of the reflux pipe is connected to the outlet of the circulation pump via a flange.

[0015] As a further embodiment of this utility model: a water meter is fixedly connected to the outer circumference of the external water pipe near the liquid inlet end, and a temperature sensor is fixedly connected to the outer circumference of the external water pipe near the water meter.

[0016] A PLC electric water supply valve and a PID regulating valve are fixedly connected to the outer circumference of the external water pipe; a water meter is also fixedly connected to the outer circumference of the external water pipe.

[0017] As a further improvement of this utility model: the water tank is fixedly connected to a second three-way pipe at the water delivery end, and one end of the second three-way pipe is connected to the liquid inlet end of the circulation pump through a flange;

[0018] The other end of the second three-way pipe is connected to a heating pump unit via a conduit, and the output end of the heating pump unit is connected to the outer wall of the delivery conduit A via a conduit.

[0019] Compared with the prior art, this utility model provides a tap water condensation flue gas waste heat recovery device, which has the following beneficial effects:

[0020] 1. This tap water condensing flue gas waste heat recovery device, through the setting of dual heat exchange components and other structures, realizes the graded utilization and efficient recovery of flue gas waste heat, improves recovery efficiency and energy saving, can effectively and significantly reduce the exhaust gas temperature, is environmentally friendly, has a simple structure, low maintenance cost, and is easy to promote and apply.

[0021] 2. In this tap water condensing flue gas waste heat recovery device, when the liquid level in the water tank reaches the upper limit and the temperature sensor detects that the water temperature in the delivery pipe A exceeds the threshold, a signal is transmitted to the processor so that it can control the circulation pump to start [at this time, the PID regulating valve is closed]. This pump draws the liquid in the water tank through the return pipe and the input water pipe and introduces it into the flue gas exchange plate heat exchanger for anti-dry burning. After circulating heating treatment, it is then introduced into the water tank heating plate heat exchanger through the delivery pipe A for secondary heating or no heating. Finally, it is collected back into the water tank through the delivery pipe B, ensuring the service life of the equipment and preventing dry burning damage.

[0022] 3. This tap water condensing flue gas waste heat recovery device has a liquid storage temperature that is directly related to the water tank level, realizing a segmented heating mode. It can flexibly adapt to actual usage conditions, thereby reducing unnecessary energy waste. At the same time, it effectively reduces the emission of harmful substances in flue gas to the outdoors, reduces the energy consumption of traditional flue gas recovery systems, and automatically controls the working temperature range of the flue gas exchange plate to maximize benefits according to the different hot water requirements. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the tap water condensing flue gas waste heat recovery device proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the tap water condensation flue gas waste heat recovery device proposed in this utility model.

[0025] In the diagram: 1 Boiler body, 2 Flue gas duct, 3 Flue gas exchange plate heat exchanger, 4 Conveying pipe A, 5 Exhaust port, 6 Water tank heating plate heat exchanger, 7 Heating pump set, 8 Conveying pipe B, 9 Water tank, 10 External water pipe, 11 Water meter 1, 12 Water meter 2, 13 Circulating pump, 14 PLC electric water supply valve, 15 PID regulating valve, 16 Return pipe, 17 Input water pipe, 18 Output water pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Example 1

[0029] Water supply condensation flue gas waste heat recovery device, such as Figure 1 As shown, the system includes a boiler body 1 and a water tank 9. A heat exchange assembly is provided between the boiler body 1 and the water tank 9. The heat exchange assembly includes a flue gas exchange plate heat exchanger 3 and a water tank heating plate heat exchanger 6. The outlet of the flue gas exchange plate heat exchanger 3 and the inlet of the water tank heating plate heat exchanger 6 are connected by bolts to the same delivery conduit A4. The outer circumference of the delivery conduit A4 is fixed with bolts to a temperature sensor 4 [anti-dry burning] and a temperature probe for detecting the temperature of the water output from the flue gas exchange plate heat exchanger 3, so that the initially heated water can enter the water tank heating plate heat exchanger 6 for secondary heating.

[0030] The inlet end of the flue gas exchange plate heat exchanger 3 and the outlet of the boiler body 1 are connected to the same flue gas pipe 2. A temperature sensor 1 for detecting the inlet flue gas temperature is fixed to the outer circumference of the flue gas pipe 2 by bolts. An exhaust port 5 is fixed to the outlet end of the flue gas exchange plate heat exchanger 3 by bolts. A temperature sensor 2 for detecting the exhaust gas temperature is fixed to the outer circumference of the exhaust port 5 by bolts. The high-temperature flue gas exchanges heat with the introduced tap water through the flue gas exchange plate heat exchanger 3. The cooled flue gas is directly discharged through the exhaust port 5, while the hot water is stored in the water tank 9, which improves the heat exchange efficiency and reduces the flue gas emission temperature.

[0031] Preferably, the inlet end of the water tank 9 and the outlet of the water tank heating plate 6 are connected by bolts to the same delivery conduit B8, and a temperature sensor for detecting the temperature of the water output from the water tank heating plate 6 is fixed to the outer circumference of the delivery conduit B8 by bolts.

[0032] Furthermore, a temperature sensor 7 for detecting the liquid temperature inside the water tank 9 and a liquid level sensor for detecting the liquid level inside the water tank 9 are fixed to one side of the inner wall by bolts.

[0033] Furthermore, the outlet end of the flue gas exchange plate heat exchanger 3 is fixed with an outlet water pipe 18 for discharging condensate by bolts, and the outer circumference of the outlet water pipe 18 is fixed with a temperature sensor 3 for detecting the temperature of the discharged condensate by bolts; to ensure the normal operation of the flue gas exchange plate heat exchanger 3.

[0034] Furthermore, the inlet end of the flue gas exchange plate heat exchanger 3 is bolted to an input water pipe 17. One end of the input water pipe 17 is connected to a first tee pipe via a flange. The two ends of the first tee pipe are respectively connected to a return pipe 16 and an external water pipe 10 in the shape of a 'b' via flanges. One end of the return pipe 16 is connected to the outlet end of the circulation pump 13 via a flange. A water meter 11 is bolted to the outer circumference of the external water pipe 10 near the inlet end, and a temperature sensor 5 for detecting the temperature of tap water is bolted to the outer circumference of the external water pipe 10 near the water meter 11. Figure 1 As shown, the external water pipe 10 has a double-track circular outer wall that is fixed with a PLC electric water supply valve 14 and a PID regulating valve 15 by bolts. The external water pipe 10 located in front of the PID regulating valve 15 has a water meter 12 fixed with bolts on its circular outer wall.

[0035] During use, external tap water is introduced through external water pipe 10 and then introduced into the flue gas exchange plate heat exchanger 3 through input water pipe 17 to exchange heat with high-temperature flue gas. Hot water flows out through delivery pipe A4. During this period, water meter 11 is used to count the total water consumption input through external water pipe 10, and water meter 2 12 is used to count the water consumption entering the pipe section where PID regulating valve 15 is located.

[0036] As a supplement, the water supply end of the water tank 9 is fixed with a second three-way pipe by bolts. One end of the second three-way pipe is connected to the liquid inlet of the circulating pump 13 through a flange. When the liquid level in the water tank 9 reaches the upper limit, and the temperature sensor 4 detects that the water temperature in the delivery pipe A4 exceeds the threshold, a signal is transmitted to the processor so that it can control the circulation pump 13 to start [at this time, the PID regulating valve 15 is closed]. This pumps the liquid in the water tank 9 through the return pipe 16 and the input water pipe 17 to the flue gas exchange plate heat exchanger 3 for anti-dry burning. After circulating heating treatment, the liquid is then introduced through the delivery pipe A4 to the water tank heating plate heat exchanger 6 for secondary heating or no heating. Finally, the liquid is collected again in the water tank 9 through the delivery pipe B8, ensuring the service life of the equipment and preventing dry burning damage.

[0037] As a supplement, in order to achieve intelligent automatic control, the temperature sensor 1, temperature sensor 2, temperature sensor 3, temperature sensor 4, temperature sensor 5, temperature sensor 6, temperature sensor 7, liquid level sensor and circulation pump 13 are connected to the processor, which can be an industrial control computer.

[0038] Working principle: When the liquid level sensor detects that the liquid level in the water tank 9 is at the lower limit, external tap water is introduced through the external water pipe 10 and then introduced into the flue gas exchange plate heat exchanger 3 through the input water pipe 17 to exchange heat with the high-temperature flue gas generated in the boiler body 1. The cooled flue gas is directly discharged through the exhaust port 5, while the hot water flows out through the conveying pipe A4 to the water tank heating plate heat exchanger 6 for secondary heating to the threshold. Finally, it is stored in the water tank 9 through the conveying pipe B8, realizing the working mode of instant heating.

[0039] When the level sensor detects that the liquid level in the water tank 9 has reached the upper limit, and the temperature sensor detects that the water temperature in the delivery pipe A4 exceeds the threshold, a signal is transmitted to the processor so that it can control the circulation pump 13 to start [at this time, the PID regulating valve 15 is closed], thereby pumping the liquid in the water tank 9 through the return pipe 16 and the input water pipe 17 into the flue gas exchange plate heat exchanger 3 for anti-dry burning and entering the circulation mode;

[0040] When the level sensor detects that the level in the water tank 9 is within the normal range, external tap water is introduced through the external water pipe 10 and then introduced into the flue gas exchange plate heat exchanger 3 through the input water pipe 17 to exchange heat with the high-temperature flue gas generated in the boiler body 1. The cooled flue gas is directly discharged through the exhaust port 5, while the hot water flows out through the conveying pipe A4 to the water tank heating plate heat exchanger 6 without secondary heating and is directly stored in the water tank 9 for later use through the conveying pipe B8.

[0041] The storage temperature of the liquid in this invention is directly related to the liquid level in the water tank 9, realizing a segmented heating mode that can flexibly adapt to actual usage conditions, thereby reducing unnecessary energy waste. The heat exchange components enable the graded utilization of waste heat from flue gas, improving recovery efficiency and energy saving. It is environmentally friendly, has a simple structure, low maintenance costs, and is easy to promote and apply.

[0042] Example 2

[0043] Water supply condensation flue gas waste heat recovery device, such as Figure 2 As shown, in order to maintain the water temperature in the water tank 9, this embodiment makes the following additions based on embodiment 1: the other end of the second three-way pipe is connected to the heating pump group 7 through a conduit, and the output end of the heating pump group 7 is connected to the outer wall of the delivery conduit A4 through a conduit.

[0044] Preferably, the heating pump group 7 consists of a main heating pump and an auxiliary heating pump, and the heating pump group 7 is communicatively connected to the processor; the default operation is the operation of the main heating pump, and when it is damaged or cannot operate normally, the auxiliary heating pump takes over the operation. This working mode is the prior art, and its working principle and structure will not be described in detail here.

[0045] When the temperature sensor 7 detects that the water temperature in the water tank 9 is below the threshold range, it transmits a signal to the processor so that the processor can control the heating pump group 7 to operate, draw liquid from the water tank 9 to the water tank heating plate heat exchanger 6 for heating, so that the liquid that meets the temperature can be collected again in the water tank 9 through the delivery pipe B8 to form a small closed heating route.

[0046] Working principle: This utility model realizes the efficient recovery and comprehensive utilization of waste heat from high-temperature flue gas in the boiler body 1, while effectively reducing the emission of harmful substances in the flue gas to the outdoors, reducing the energy consumption of traditional flue gas recovery systems, and automatically controlling the working temperature range of the flue gas exchange plate to maximize benefits according to the different required hot water volume.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tap water condensing flue gas waste heat recovery device, comprising a boiler body (1) and a water tank (9), characterized in that, A heat exchange assembly is provided between the boiler body (1) and the water tank (9). The heat exchange assembly includes a flue gas exchange plate heat exchanger (3) and a water tank heating plate heat exchanger (6). The outlet of the flue gas exchange plate heat exchanger (3) and the inlet of the water tank heating plate heat exchanger (6) are connected by the same conveying pipe A (4) through bolts. A temperature sensor and a liquid level sensor are fixedly connected to one side of the inner wall of the water tank (9).

2. The tap water condensation flue gas waste heat recovery device according to claim 1, characterized in that, Temperature sensor 4 and temperature probe are fixedly connected to the outer circumference of the delivery conduit A (4).

3. The tap water condensation flue gas waste heat recovery device according to claim 2, characterized in that, The inlet end of the flue gas exchange plate heat exchanger (3) and the outlet of the boiler body (1) are connected to the same flue gas pipe (2), and a temperature sensor is fixedly connected to the outer circumference of the flue gas pipe (2). The outlet end of the flue gas exchange plate heat exchanger (3) is fixedly connected to a flue gas outlet (5), and a temperature sensor is fixedly connected to the outer circumference of the flue gas outlet (5).

4. The tap water condensation flue gas waste heat recovery device according to claim 3, characterized in that, The outlet end of the flue gas exchange plate heat exchanger (3) is fixedly connected to an output water pipe (18), and a temperature sensor is fixedly connected to the outer circumference of the output water pipe (18).

5. The tap water condensation flue gas waste heat recovery device according to claim 1, characterized in that, The inlet of the water tank (9) and the outlet of the water tank heating plate (6) are connected by bolts to the same delivery conduit B (8), and a temperature sensor is fixedly connected to the outer circumference of the delivery conduit B (8).

6. The tap water condensation flue gas waste heat recovery device according to claim 1, characterized in that, The inlet end of the flue gas exchange plate heat exchanger (3) is fixedly connected to an input water pipe (17). One end of the input water pipe (17) is connected to a first tee pipe through a flange. The two ends of the first tee pipe are respectively connected to a return pipe (16) and an external water pipe (10) in the shape of 'b' through flanges. One end of the return pipe (16) is connected to the outlet of the circulation pump (13) via a flange.

7. The tap water condensation flue gas waste heat recovery device according to claim 6, characterized in that, The external water pipe (10) is fixedly connected to a water meter (11) near the liquid inlet end, and a temperature sensor (5) is fixedly connected to the external water pipe (10) near the water meter (11). The outer circumference of the external water pipe (10) is fixedly connected to a PLC electric water supply valve (14) and a PID regulating valve (15); the outer circumference of the external water pipe (10) is fixedly connected to a water meter (12).

8. The tap water condensation flue gas waste heat recovery device according to claim 7, characterized in that, The water tank (9) is fixedly connected to a second three-way pipe at the water delivery end, and one end of the second three-way pipe is connected to the liquid inlet of the circulating pump (13) through a flange. The other end of the second three-way pipe is connected to a heating pump group (7) through a conduit, and the output end of the heating pump group (7) is connected to the outer wall of the delivery conduit A (4) through a conduit.

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