A high-temperature exhaust gas waste heat recovery device

Abstract

The utility model relates to a waste heat recovery technical field, concretely is a kind of high-temperature tail gas waste heat recovery device, comprising: shell and spiral heat exchange tube;Wherein, the bottom of shell one end is connected with cold water delivery pipe, the top of shell one end is connected with drain pipe, the inner surface of shell is equipped with heat preservation cavity, and the lower end of heat preservation cavity is provided with exhaust pipe;Wherein, the spiral heat exchange tube is located in the inside of shell, the inside of spiral heat exchange tube is equipped with S-shaped partition, the inside of spiral heat exchange tube is separated by S-shaped partition and is separated out water channel and tail gas channel.The utility model carries out efficient heat exchange by high-temperature tail gas in tail gas channel and cold water in water channel separated by only one wall, then, heat exchange tube whole immersion in the water body of shell, and residual heat of tail gas is again transferred to shell side water body by pipe wall, and this double heat exchange mechanism greatly extracts the heat energy in tail gas, and significantly improves waste heat recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a high-temperature exhaust gas waste heat recovery device. Background Technology

[0002] In industrial production processes, the emission of high-temperature exhaust gases is a significant source of energy waste. To improve energy efficiency and reduce environmental pollution, high-temperature exhaust gas waste heat recovery technology has become an important means of energy conservation and emission reduction. Currently, the most common waste heat recovery method is to use a heat exchanger to transfer the heat from the high-temperature exhaust gases to cooling water, thereby achieving heat energy recovery.

[0003] Currently, existing high-temperature exhaust gas waste heat recovery devices typically pass the high-temperature exhaust gas through a curved pipe filled with cooling water to exchange heat between the exhaust gas and the water. The contact area in this method determines the efficiency of waste heat recovery, and the flow direction of the high-temperature exhaust gas limits its contact area with the pipe, resulting in low heat exchange efficiency. Therefore, we propose a high-temperature exhaust gas waste heat recovery device. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature exhaust gas waste heat recovery device, which has the advantage of high waste heat recovery efficiency. It solves the problem that existing high-temperature exhaust gas waste heat recovery devices usually pass the high-temperature exhaust gas through a curved pipe filled with cooling water to exchange heat between the high-temperature exhaust gas and the water. The contact area of ​​this method determines the efficiency of waste heat recovery, and the flow direction of the high-temperature exhaust gas determines that its contact area with the pipe is limited, which leads to low heat exchange efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature exhaust gas waste heat recovery device, comprising: Shell and spiral heat exchange tubes; The bottom end of the shell is connected to a cold water delivery pipe, the top end of the shell is connected to a drain pipe, the inner surface of the shell is provided with a heat insulation cavity, and the lower end of the heat insulation cavity is provided with an exhaust pipe. The spiral heat exchange tube is located inside the shell. An S-shaped partition is provided on the inner side of the spiral heat exchange tube, which separates the water flow channel and the exhaust flow channel. The lower end of the spiral heat exchange tube is provided with an exhaust gas delivery pipe that communicates with the exhaust flow channel. The upper end of the spiral heat exchange tube is provided with a gas guide pipe that communicates with the exhaust flow channel. The upper end of the spiral heat exchange tube is provided with a liquid guide branch pipe that communicates with the water flow channel. A liquid distribution branch pipe connects the water flow channel and the cold water delivery pipe at the lower end of the spiral heat exchange tube.

[0006] Preferably, a spiral guide plate is fixed to the inner side of the heat preservation cavity.

[0007] Preferably, an L-shaped fixing plate is fixed to the lower end of one side of the shell, and a booster fan is installed at one end of the L-shaped fixing plate. The air inlet of the booster fan is connected to the exhaust channel at the lower end of the spiral heat exchange tube through a pipe. At the same time, a solenoid valve is installed on the pipe used for connection.

[0008] Preferably, the air duct extends into the insulation cavity.

[0009] Preferably, the liquid guide branch is located at the upper end of the inner cavity of the shell.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model achieves efficient heat exchange between high-temperature exhaust gas and cold water in a water channel separated only by a wall. Subsequently, the heat exchange tube is completely immersed in the water in the shell, and the residual heat of the exhaust gas is transferred to the shell water through the tube wall. This dual heat exchange mechanism greatly extracts the heat energy from the exhaust gas and significantly improves the waste heat recovery efficiency.

[0011] 2. The S-shaped separator of this utility model not only serves to separate the flow channels, but also acts as an inner fin, greatly increasing the effective contact heat exchange area between the exhaust gas and the pipe wall, breaking the bottleneck of low heat exchange efficiency of traditional bare tubes.

[0012] 3. In this invention, the exhaust gas after the main heat exchange is not directly discharged, but is introduced into the insulation cavity. Its residual heat is used to insulate the main shell, which significantly reduces the heat loss of the shell to the environment and makes more effective use of the recovered heat energy. Attached Figure Description

[0013] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention from a second perspective; Figure 3 This is a schematic diagram of the fitting structure of the spiral heat exchange tube and the liquid distribution branch tube of this utility model; Figure 4 This is a cross-sectional view of the spiral heat exchanger tube of this utility model.

[0014] In the diagram: 1. Shell; 101. Cold water delivery pipe; 102. Drain pipe; 103. Insulation cavity; 104. Spiral guide plate; 2. Exhaust gas delivery pipe; 3. Spiral heat exchanger tube; 301. Gas guide pipe; 302. Liquid distribution branch pipe; 303. Liquid guide branch pipe; 304. S-shaped separator; 305. Water flow channel; 306. Exhaust gas flow channel; 4. L-shaped fixing plate; 401. Booster fan. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] The components of this application, including the shell 1, cold water conveying pipe 101, drain pipe 102, insulation cavity 103, spiral guide plate 104, exhaust gas conveying pipe 2, spiral heat exchange pipe 3, gas guide pipe 301, liquid branch pipe 302, liquid branch pipe 303, S-shaped partition plate 304, water flow channel 305, exhaust gas flow channel 306, L-shaped fixing plate 4, and booster fan 401, are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Example

[0017] Please see Figures 1-4 As shown, this utility model provides a technical solution: a high-temperature exhaust gas waste heat recovery device, comprising: Shell 1 and spiral heat exchange tube 3; The bottom end of the shell 1 is connected to a cold water delivery pipe 101, the top end of the shell 1 is connected to a drain pipe 102, the inner surface of the shell 1 is provided with a heat insulation cavity 103, and the lower end of the heat insulation cavity 103 is provided with an exhaust pipe. The spiral heat exchange tube 3 is located inside the shell 1. An S-shaped partition 304 is provided inside the spiral heat exchange tube 3. The inner side of the spiral heat exchange tube 3 is separated into a water flow channel 305 and a tail gas flow channel 306 by the S-shaped partition 304. The lower end of the spiral heat exchange tube 3 is provided with a tail gas delivery pipe 2 that communicates with the tail gas flow channel 306. The upper end of the spiral heat exchange tube 3 is provided with a gas guide pipe 301 that communicates with the tail gas flow channel 306. The upper end of the spiral heat exchange tube 3 is provided with a liquid guide branch pipe 303 that communicates with the water flow channel 305. A liquid distribution branch pipe 302 is connected between the water flow channel 305 at the lower end of the spiral heat exchange tube 3 and the cold water delivery pipe 101.

[0018] The air guide tube 301 extends into the heat preservation cavity 103, and the liquid guide branch tube 303 is located at the upper end of the inner cavity of the shell 1.

[0019] This technical solution involves the following steps: First, connecting the cold water delivery pipe 101 to an external cold water source, connecting the drain pipe 102 to a hot water collection system or equipment requiring heat, and connecting the exhaust gas delivery pipe 2 to a high-temperature exhaust gas source. During operation, cold water enters the inner cavity of the shell 1 through the cold water delivery pipe 101 and is distributed to the water flow channel 305 of the spiral heat exchanger tube 3 via the liquid distribution branch pipe 302. The water flows through the channel and then returns to the upper part of the inner cavity of the shell 1 via the liquid guide branch pipe 303, finally exiting through the drain pipe 102. Meanwhile, the high-temperature exhaust gas exits through the exhaust gas delivery pipe... 2. The exhaust gas enters the exhaust gas channel 306 of the spiral heat exchange tube 3 and flows inside the tube. During this process, the exhaust gas exchanges heat efficiently with the cold water in the water channel 305 through the metal tube wall and S-shaped partition 304. At the same time, it exchanges heat with the water inside the shell 1 that surrounds the spiral heat exchange tube 3. Then, the cooled exhaust gas is discharged from the top air guide pipe 301 and enters the heat preservation chamber 103 to achieve the heat preservation effect of the shell 1. Finally, it is discharged at low temperature from the bottom exhaust pipe. Through the above method, the device can achieve continuous and efficient heat energy recovery. Example

[0020] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, a spiral guide plate 104 is fixed to the inner side of the heat preservation cavity 103.

[0021] This technical solution: By setting the spiral guide plate 104, the flow path of the exhaust gas in the heat preservation cavity 103 will be extended, and the exhaust gas entering the heat preservation cavity 103 will spiral forward under the guidance of the spiral guide plate 104, and will continue to transfer its residual heat to the internal heat exchanger through the wall of the shell 1 until the temperature drops to close to the ambient temperature before being discharged from the exhaust pipe.

[0022] In addition, it should be noted that the device has an openable dust removal and sealing door at the exhaust pipe, which facilitates the periodic manual cleaning of the small amount of dust that may settle in the insulation chamber 103, ensuring the stability and reliability of the equipment in long-term operation (not shown in the figure due to perspective). Example

[0023] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, an L-shaped fixing plate 4 is fixed to the lower end of one side of the housing 1. A booster fan 401 is installed at one end of the L-shaped fixing plate 4, and the air inlet of the booster fan 401 is connected to the exhaust channel 306 at the lower end of the spiral heat exchange tube 3 through a pipe. At the same time, a solenoid valve is installed on the pipe used for connection.

[0024] This technical solution: Through the setting of the booster fan 401, and via a preset program (this is existing technology), the timer controller automatically starts the booster fan 401 and the solenoid valve on the connecting pipeline once at regular intervals (e.g., Figure 2As shown), the running time is approximately 1-3 minutes. The booster fan 401 exhausts and pressurizes the exhaust gas at the inlet end of the exhaust gas duct 306, which increases the air pressure inside the exhaust gas duct 306 of the heat exchange tube. This causes the exhaust gas inside the exhaust gas duct 306 to accelerate in a short time, which can prevent dust in the exhaust gas from accumulating inside the spiral heat exchange tube 3. In addition, the spiral heat exchange tube 3 used in this device has a larger bending radius, which reduces the resistance and centrifugal force of the exhaust gas flow, making it difficult for dust to accumulate at the bend. This complements the pulse cleaning function of the booster fan 401. The dust blown away eventually enters the insulation chamber 103 along with the exhaust gas. Due to the reduced airflow speed inside the insulation chamber 103, most of the dust will settle at the bottom. During the regular maintenance of the equipment, the operator can open the dust cleaning sealed door at the exhaust pipe to clean the dust settled at the bottom of the insulation chamber 103, thereby completing the entire dust cleaning process.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A high-temperature exhaust gas waste heat recovery device, characterized in that, include: Shell (1) and spiral heat exchange tube (3); Wherein, one end of the bottom of the shell (1) is connected to a cold water conveying pipe (101), one end of the top of the shell (1) is connected to a drain pipe (102), the inner surface of the shell (1) is provided with a heat insulation cavity (103), and the lower end of the heat insulation cavity (103) is provided with an exhaust pipe; The spiral heat exchange tube (3) is located inside the shell (1). The spiral heat exchange tube (3) is provided with an S-shaped partition (304) on its inner side. The spiral heat exchange tube (3) is separated into a water channel (305) and a tail gas channel (306) by the S-shaped partition (304). The lower end of the spiral heat exchange tube (3) is provided with a tail gas delivery pipe (2) that communicates with the tail gas channel (306). The upper end of the spiral heat exchange tube (3) is provided with a gas guide pipe (301) that communicates with the tail gas channel (306). The upper end of the spiral heat exchange tube (3) is provided with a liquid guide branch pipe (303) that communicates with the water channel (305). The water channel (305) at the lower end of the spiral heat exchange tube (3) is connected to the cold water delivery pipe (101) by a liquid distribution branch pipe (302).

2. The high-temperature exhaust gas waste heat recovery device according to claim 1, characterized in that: A spiral guide plate (104) is fixed to the inner side of the heat preservation cavity (103).

3. The high-temperature exhaust gas waste heat recovery device according to claim 1, characterized in that: An L-shaped fixing plate (4) is fixed to the lower end of one side of the housing (1). A booster fan (401) is installed at one end of the L-shaped fixing plate (4), and the air inlet of the booster fan (401) is connected to the exhaust channel (306) at the lower end of the spiral heat exchange tube (3) through a pipe. At the same time, a solenoid valve is installed on the pipe used for connection.

4. The high-temperature exhaust gas waste heat recovery device according to claim 1, characterized in that: The air duct (301) extends into the insulation cavity (103).

5. A high-temperature exhaust gas waste heat recovery device according to claim 1, characterized in that: The liquid guide branch (303) is located at the upper end of the inner cavity of the shell (1).

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