A heat recovery device for exhaust duct

Abstract

A heat recovery device for a flue gas duct includes a hood, a water distribution pipe, an annular pipe, a water collection tank, a fixed support, a water pump, a water tank, a temperature control valve, and a temperature transmitter. The hood is a conical cylindrical structure with a slot provided on the bottom edge. It is fixed to the inner wall of the flue gas duct by a fixed support. Drain holes are evenly provided at the bottom of the hood. A plurality of water distribution pipes are evenly provided on the conical surface of the hood. The bottom of the water distribution pipe is connected to the annular pipe and is connected to the water pump through a conduit. The water pump is connected to the water outlet of the water tank through the conduit. The water tank has a water inlet connected to the temperature control valve through a conduit. The temperature control valve is connected to the water collection tank through a conduit. A branch pipeline is provided between the water pump and the water tank. A temperature transmitter is provided on the branch pipeline. The temperature transmitter is connected to the temperature control valve. The present invention has a fast heat exchange speed and high efficiency. The annular hood blocks water and the annular water collection tank collects water, so that the device has low heat loss while using water as the heat transfer medium.

Description

Technical Field

[0001] The present invention relates to the technical field of flue waste gas collection and recycling, and in particular to a heat recovery device for a flue gas exhaust duct. Background Art

[0002] When a diesel generator is installed in an excavated underground project, a smoke exhaust vent will be installed on the ground. The temperature of the flue gas in the smoke exhaust vent can reach 150 degrees or even higher. As the high-temperature smoke gas is discharged, the heat will cause energy waste and the temperature of the smoke exhaust shaft will rise rapidly, which will lead to infrared exposure. The background of excavated underground projects is often an urban background. The project adopts a design method that combines special and general situations. Special situation planning requires concealment; for example, underground garages are generally used. Underground garages are relatively open and have fewer obstacles from permanent buildings. In special circumstances, they must be concealed and not detected. The heat recovery of the smoke from the smoke exhaust vent can be used as a heat source for heating water in special circumstances. On the other hand, it can extend the infrared exposure time, thereby extending the service life of the underground project as much as possible and achieving the low-carbon effect of underground project use. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a heat recovery device for a smoke exhaust duct, which can be concealed and undetected in special circumstances, and can serve as a heat source for heating water in special circumstances.

[0004] To achieve the above-mentioned object, the present invention adopts the following technical scheme: A heat recovery device for a flue gas duct, comprising: a hood, a water distribution pipe, an annular pipe, a water collection tank, a fixed support A, a fixed support B, a water pump, a water tank, a temperature control valve, a temperature transmitter and a conduit. The hood is a conical cylindrical structure as a whole, and a slot is provided on its bottom edge. The hood is fixed to the inner wall of the flue through the slot and the fixed support A. The hood is evenly provided with drainage holes at the bottom between the slot and the conical surface. The hood is evenly provided with multiple water distribution pipes on its conical surface. The bottoms of the multiple water distribution pipes are all connected by the annular pipe. The annular pipe is connected to one end of the water pump through the conduit, and the other end of the water pump is connected to the water outlet of the water tank through the conduit. The water tank is provided with a water inlet, and the water inlet is connected to one end of the temperature control valve through the conduit. The other end of the temperature control valve is connected to the water collection tank through the conduit. A branch pipe is also provided on the conduit between the water pump and the water tank, and a temperature transmitter is provided on the branch pipe. The branch pipe is connected to the temperature control valve after passing through the temperature transmitter.

[0005] The water collecting trough is an annular structure with a groove as a whole, and its outer edge also has a slot, which is fixed to the inner wall of the flue below the hood through the cooperation of the slot and the fixed support B; the water collecting trough is also provided with a water outlet at the bottom of the trough body, and the water outlet is connected to the temperature control valve through a conduit.

[0006] The number of the fixed supports A is multiple, at least not less than six, and they are evenly arranged on the inner wall of the flue for fixing and supporting the hood; the number of the fixed supports B is multiple, at least not less than six, and they are evenly arranged on the inner wall of the flue for fixing and supporting the water collection tank.

[0007] The drainage hole at the bottom of the wind hood matches the trough body of the water collecting trough and is located just above the trough body.

[0008] The angle between the conical surface of the hood and the flue is greater than or equal to 45 degrees and less than or equal to 60 degrees.

[0009] The temperature control valve is an electric three-way temperature control valve, which is respectively connected to the water collecting tank, the water tank and the temperature transmitter through a conduit.

[0010] The water outlet at the upper end of the water distribution pipe is lower than the upper edge of the hood.

[0011] The water tank is also provided with a water outlet, which is connected to the water end through a conduit.

[0012] The temperature transmitter is connected to the temperature control valve circuit via a wire, and the probe on the temperature transmitter is preferably a stainless steel probe.

[0013] The present invention has the following beneficial effects: Using a water-based heat exchange mode within the flue, the heat exchange rate is fast and efficient. A hood structure within the flue supports the water distribution pipe and enhances air disturbance, cooling the flue gas at that section while ensuring uniform mixing of the flue gas in subsequent sections. The annular hood blocks water and the annular water collection trough collects water, allowing the device to use water as the heat transfer medium while minimizing heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic top view of the flue of the present invention.

[0016] Figure 3 for Figure 1 Partial schematic diagram of point A

[0017] In the figure: 1, hood, 101, slot A, 102, drain hole, 2, water distribution pipe, 3, ring pipe, 4, water collection tank, 401, slot B, 5, fixed support A, 6, fixed support B, 7, water pump, 8, water tank, 9, temperature control valve, 10, temperature transmitter. Implementation Method

[0018] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings of this specification. It should be noted that the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 3 A heat recovery device for a flue gas duct comprises: a hood 1, a water distribution pipe 2, a ring pipe 3, a water collecting tank 4, a fixed support A5, a fixed support B6, a water pump 7, a water tank 8, a temperature control valve 9, a temperature transmitter 10 and a conduit. The characteristics are as follows: the hood 1 is a conical cylindrical structure as a whole, a card groove A101 is provided on the bottom edge thereof, and the card groove A101 is fixed to the inner wall of the flue gas duct through the cooperation of the card groove A101 and the fixed support A5. The hood 1 is evenly provided with drainage holes 102 at the bottom between the card groove A101 and the conical surface. The hood 1 is evenly provided with multiple water distribution pipes 2 on its conical surface. The bottoms of the water pipes 2 are connected through an annular pipe 3, the annular pipe 3 is connected to one end of the water pump 7 through a conduit, the other end of the water pump 7 is connected to the water outlet of the water tank 8 through a conduit, the water tank 8 is provided with a water inlet, the water inlet is connected to one end of the temperature control valve 9 through a conduit, the other end of the temperature control valve 9 is connected to a water collecting tank 4 through a conduit, the water collecting tank 4 is located below the hood 1, a branch pipeline is also provided on the conduit between the water pump 7 and the water tank 8, a temperature transmitter 10 is provided on the branch pipeline, and the branch pipeline is connected to the temperature control valve 9 after passing through the temperature transmitter 10.

[0020] The water collecting trough 4 is an annular structure with a groove as a whole, and its outer edge has a slot B401, which is fixed to the inner wall of the flue below the hood 1 through the cooperation of the slot B401 and the fixed support B6; the water collecting trough 4 is also provided with a water outlet at the bottom of the trough body, and the water outlet is connected to the temperature control valve 9 through a conduit.

[0021] The number of the fixed supports A5 is at least six, which are evenly arranged on the inner wall of the flue for fixing and supporting the hood 1; the number of the fixed supports B6 is at least six, which are evenly arranged on the inner wall of the flue for fixing and supporting the water collection tank 4.

[0022] The drainage hole 102 provided at the bottom of the hood 1 matches the trough body of the water collecting trough 4 and is located just above the trough body.

[0023] The angle between the conical surface of the hood 1 and the flue is greater than or equal to 45° and less than or equal to 60°.

[0024] The temperature control valve 9 is an electric three-way temperature control valve, which is respectively connected to the water collecting tank 4, the water tank 8 and the temperature transmitter 10 through conduits.

[0025] The water outlet at the upper end of the water distribution pipe 2 is lower than the upper edge of the hood 1.

[0026] The temperature transmitter 10 is connected to the temperature control valve 9 via a wire, and the probe on the temperature transmitter 10 is preferably a stainless steel probe.

[0027] The water tank 8 is also provided with a water outlet, which is connected to the water end through a conduit.

[0028] When the present invention is used: after turning on the water pump 7, water enters the annular pipe 3 through the conduit, flows from bottom to top through the water distribution pipe 2, and flows out from the outlet of the upper water distribution pipe 2. The whole process of flowing from top to bottom through the conical surface of the wind cap 1 is a heat exchange process. The whole process lasts for about 30 seconds, and the water temperature rises by 5-10°C. After heating, the water flows into the water collection tank 4 through the drainage hole 102 at the bottom of the wind cap 1, and the water flows out from the water outlet below the water collection tank 4, flows through the conduit through the temperature control valve 9, and the temperature control valve 9 can control the water in the pipeline to circulate again. Heating or entering the water tank 8, the temperature control valve 9 adopts an electric three-way temperature control valve. The opening signal of the temperature control valve 9 comes from the temperature transmitter 10 of the branch pipeline. When the temperature collected by the temperature transmitter 10 is greater than the set value, the temperature control valve 9 opens the first state, and the water in the pipeline flows into the water tank 8. At the same time, the water pump 7 sucks the low-temperature water in the water tank 8 into the system and distributes the water to the flue to complete the heat exchange again; when the temperature is lower than the set value, the temperature control valve 9 opens the second state, and the water in the pipeline is pressurized again by the water pump 7 and enters the flue to complete the heat exchange. Example

[0029] The flue diameter is 1m, the flue wind speed is 5m / s, and the flue gas temperature is 120°C. The hood 1 is constructed of 10mm steel plate, with the sidewalls of the hood 1 forming a 45° angle with the flue. The hood 1 is 0.4m tall, and the upper and lower base diameters of the hood 1 are 1m and 0.2m, respectively. The fixed support A5 at the bottom of the hood 1 must bear a load of no less than 200kg. The steel plate in the fixed support A5 is 50mm thick and 10cm wide. The bolts are embedded in the concrete for a length of 15cm, with six bolts distributed evenly around the steel plate. The water distribution pipe 2 on the upper side of the hood 1 is constructed of DN15 steel pipes, each 0.5m long. There are 30 of these pipes in total. The water distribution pipe 2 is open at the top and connected to the bottom by a DN40 diameter ring pipe 3. The ring pipe 3 extends 3.14m within the flue. The trough 4 is anchored, 0.2m from the lower edge of the hood 1. Its width and height are both 0.1m. It is welded from steel plates and arranged in a ring-shaped structure along the inside of the exhaust duct. A DN40 steel pipe is connected to the trough 4's outlet, 0.2m below the outlet.

[0030] The temperature control valve 9 adopts a three-way temperature control valve, and the temperature collection point is the temperature transmitter 10 on the branch pipeline. When the temperature reaches 50°C, the valve opens to the first state, and the water in the pipeline flows into the water tank 8. At the same time, the water pump 7 sucks the low-temperature water in the water tank 8 into the system and distributes the water to the flue to complete the heat exchange again; when the temperature is less than 50°C, the valve opens to the second state, and the water in the pipeline is pressurized again by the water pump 7 and enters the flue to complete the heat exchange.

[0031] The total length of the water distribution pipe 2 is approximately 20 meters, and the parameters of the water pump 7 are: flow rate 3 L / s, head 20 meters. The water in the pipe circulates once in approximately 30 seconds. The water flows in the flue as a wall-coated flow, and the contact time between water and flue gas is approximately 10 seconds. The water temperature rises by 10-15°C per cycle. After approximately 3 minutes of stable system operation, the temperature control valve 9 opens from the second state to the first state for the first time. The hot water in the pipe enters the water tank 8, and the cold water in the water tank 8 enters the water distribution pipe 2, where it then exchanges heat with the flue gas. This device can reduce the flue gas temperature by 3°C.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0033] The parts not described in detail in this invention are prior art.

Claims

1. A heat recovery device for a flue gas duct, comprising: A wind cap (1), a water distribution pipe (2), an annular pipe (3), a water collecting tank (4), a fixed support A (5), a fixed support B (6), a water pump (7), a water tank (8), a temperature control valve (9), a temperature transmitter (10) and a conduit, characterized in that: the wind cap (1) is a conical cylindrical structure as a whole, a groove A (101) is provided on the bottom edge thereof, and the wind cap (1) is fixed to the inner wall of the flue through the groove A (101) and the fixed support A (5), the wind cap (1) is evenly provided with drainage holes (102) at the bottom between the groove A (101) and the conical surface, the wind cap (1) is evenly provided with a plurality of water distribution pipes (2) on its conical surface, and the bottom of the plurality of water distribution pipes (2) is evenly provided with drainage holes (102) at the bottom between the groove A (101) and the conical surface. The annular tube (3) is connected to one end of the water pump (7) through a conduit, and the other end of the water pump (7) is connected to the water outlet of the water tank (8) through a conduit. The water tank (8) is provided with a water inlet, and the water inlet is connected to one end of the temperature control valve (9) through a conduit. The other end of the temperature control valve (9) is connected to a water collecting tank (4) through a conduit. The water collecting tank (4) is located below the hood (1). A branch pipeline is also provided on the conduit between the water pump (7) and the water tank (8), and a temperature transmitter (10) is provided on the branch pipeline. The branch pipeline is connected to the temperature control valve (9) after passing through the temperature transmitter (10).

2. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The water collecting trough (4) is an annular structure with a groove as a whole, and has a slot B (401) on its outer edge, and is fixed to the inner wall of the flue below the hood (1) through the cooperation of the slot B (401) and the fixed support B (6); the water collecting trough (4) is also provided with a water outlet at the bottom of the trough body, and the water outlet is connected to the temperature control valve (9) through a conduit.

3. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The number of the fixed supports A (5) is at least not less than six, and they are evenly arranged on the inner wall of the flue for fixing and supporting the hood (1); the number of the fixed supports B (6) is at least not less than six, and they are evenly arranged on the inner wall of the flue for fixing and supporting the water collecting tank (4).

4. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The drainage hole (102) provided at the bottom of the wind cap (1) cooperates with the trough body of the water collecting trough (4) and is located directly above the trough body.

5. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The angle between the conical surface of the hood (1) and the flue is greater than or equal to 45° and less than or equal to 60°.

6. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The temperature control valve (9) is an electric three-way temperature control valve, and the temperature control valve (9) is respectively connected to the water collecting tank (4), the water tank (8) and the temperature transmitter (10) through a conduit.

7. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The water outlet at the upper end of the water distribution pipe (2) is lower than the upper edge of the hood (1).

8. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The temperature transmitter (10) is connected to the temperature control valve (9) circuit via a wire, and the probe on the temperature transmitter (10) is a stainless steel probe.

9. The heat recovery device for a flue gas duct according to claim 1, characterized in that: The water tank (8) is also provided with a water outlet, which is connected to the water end via a conduit.

Images