Exhaust gas heat recovery device

Abstract

This utility model discloses a device for recovering heat from exhaust gas, relating to the field of exhaust gas recovery technology. It includes a heat recovery box, a fan installed on one side of the heat recovery box, a pretreatment mechanism installed at one end of the fan, and a heat recovery mechanism installed inside the heat recovery box. In this utility model, the fan operates to send exhaust gas into the heat recovery box from the feed pipe. Spiral heat exchange plates guide the incoming exhaust gas in a spiral motion, causing it to move upwards along the direction of the spiral heat exchange plates. A heat exchange medium is sent into the heat exchange tube through a second connecting pipe. The heat exchange medium flows inside the heat exchange tube and exchanges heat with the exhaust gas flowing outside. By extending the flow path between the exhaust gas and the heat exchange medium, the contact time is increased, allowing the coolant to better absorb heat from the exhaust gas, bringing the heat exchange closer to equilibrium and improving the efficiency of heat recovery from the exhaust gas.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, and in particular to an exhaust gas heat recovery device. Background Technology

[0002] Non-condensable gases are gases that cannot be condensed into liquids under specific temperature and pressure conditions. By utilizing the differences in physical properties between non-condensable gases and other condensable gases or liquids, such as boiling point and density, non-condensable gases can be separated from the mixed gas and recovered through processes such as cooling, condensation, and gas-liquid separation. During the recovery of non-condensable gases, the heat in the exhaust gas can be recovered and utilized.

[0003] For example, CN210050584U discloses a heat recovery and utilization device for exhaust gas from a thermal oil furnace, including a heating base, a base, a preheating barrel, and a heat exchange box. A thermal oil furnace is arranged in the middle of the upper end of the heating base. A first gas guide pipe is connected to the upper left side of the thermal oil furnace. Support columns are symmetrically arranged on the left and right sides of the upper end of the base. A bushing seat is provided at the upper end of each support column. A first rotating shaft and a second rotating shaft are respectively arranged at the left and right ends of the preheating barrel. The first rotating shaft and the second rotating shaft are rotatably connected to the support columns through the bushing seat.

[0004] In existing technologies, during the process of recovering and reusing heat from exhaust gas, insufficient contact between the exhaust gas and the heat exchange medium can lead to problems such as insufficient heat transfer from the exhaust gas to the heated medium. As a result, the temperature of the recovered exhaust gas remains high, or the temperature of the heated medium fails to reach the expected level, leading to energy waste. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art that the contact between the exhaust gas and the heat exchange medium is insufficient, resulting in the exhaust gas heat not being fully transferred to the heated medium, and to propose an exhaust gas heat recovery device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a tail gas heat recovery device, comprising a heat recovery box, a fan installed on one side of the heat recovery box, a pretreatment mechanism installed at one end of the fan, a heat recovery mechanism installed inside the heat recovery box, the heat recovery mechanism comprising a separator cylinder and a feed pipe, the top end of the separator cylinder being fixedly connected to the inside of the heat recovery box, a spiral heat exchange plate being fixedly connected to the outside of the separator cylinder, a heat exchange tube being fixedly connected to the inside of the separator cylinder, one end of the heat exchange tube being fixedly connected to a second connecting pipe, the other end of the second connecting pipe passing through the top of the heat recovery box, and the other end of the heat exchange tube being fixedly connected to a first connecting pipe, the other end of the first connecting pipe passing through the top of the heat recovery box.

[0007] Preferably, one end of the feed pipe is fixedly connected to the bottom end of the heat recovery box, and the other end of the feed pipe is fixedly connected to one end of the fan.

[0008] Preferably, a discharge pipe is fixedly connected to one side of the heat recovery box.

[0009] Preferably, the pretreatment mechanism includes a first outer shell, the other end of the blower is fixedly connected to one end of the first outer shell, a connecting shell is installed at the other end of the first outer shell, a second outer shell is installed at one end of the connecting shell, and a feeding channel is fixedly connected to one end of the second outer shell.

[0010] Preferably, a connecting screw is installed on the outer side of the connecting housing, and the two ends of the connecting screw are respectively connected to the outer side of the second outer housing and the outer side of the first outer housing.

[0011] Preferably, a connecting plate is fixedly connected inside the second outer shell, and a dust collection bag is fixedly connected to the connecting plate.

[0012] Preferably, a second adsorption plate is fixedly connected inside the connecting housing, and a first adsorption plate is fixedly connected inside the first outer housing.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, the fan operates to send the exhaust gas from the feed pipe into the interior of the heat recovery box. The spiral heat exchanger can guide the incoming exhaust gas in a spiral manner. The exhaust gas moves upward in a spiral along the direction of the spiral heat exchanger. The heat exchange medium is sent into the interior of the heat exchange tube through the second connecting pipe. The heat exchange medium flows inside the heat exchange tube and exchanges heat with the exhaust gas flowing outside. By extending the flow path of the exhaust gas and the heat exchange medium, the contact time is increased, which allows the coolant to better absorb the heat in the exhaust gas, making the heat exchange closer to the equilibrium state and improving the heat recovery efficiency of the exhaust gas.

[0015] 2. In this utility model, the exhaust gas is fed into the interior of the second outer shell through the feeding channel. First, the dust and impurities inside the exhaust gas are filtered out by the dust removal bag. The pre-treated exhaust gas enters the interior of the connecting screw. The second adsorption plate can adsorb the moisture inside the exhaust gas, thus dehydrating the exhaust gas. Subsequently, the first adsorption plate adsorbs the sulfides in the exhaust gas, thereby pre-treating the exhaust gas, removing the corrosive components, reducing corrosion to pipes and equipment, and preventing equipment leakage and damage, which would affect normal operation. Attached Figure Description

[0016] Figure 1 This utility model provides a three-dimensional structural diagram of a tail gas heat recovery device;

[0017] Figure 2This utility model provides a schematic diagram of the internal cross-sectional structure of a tail gas heat recovery device;

[0018] Figure 3 This utility model provides a cross-sectional structural diagram of the heat recovery mechanism of a tail gas heat recovery device;

[0019] Figure 4 This utility model presents a disassembled structural diagram of the pretreatment mechanism of a tail gas heat recovery device.

[0020] Legend: 1. Heat recovery box; 2. Heat recovery mechanism; 21. Spiral heat exchange fins; 22. Discharge pipe; 23. First connecting pipe; 24. Separator cylinder; 25. Second connecting pipe; 26. Feed pipe; 27. Heat exchange tube; 3. Pretreatment mechanism; 31. First outer shell; 32. Second outer shell; 33. Feed channel; 34. Connecting plate; 35. Connecting shell; 36. First adsorption plate; 37. Connecting screw; 38. Second adsorption plate; 39. Dust collection bag; 4. Fan. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1: As Figure 1 - Figure 4 As shown, this utility model provides a tail gas heat recovery device, including a heat recovery box 1. A fan 4 is installed on one side of the heat recovery box 1, and a pretreatment mechanism 3 is installed at one end of the fan 4. A heat recovery mechanism 2 is installed inside the heat recovery box 1. The heat recovery mechanism 2 includes a separator cylinder 24 and a feed pipe 26. The top end of the separator cylinder 24 is fixedly connected to the inside of the heat recovery box 1. A spiral heat exchange plate 21 is fixedly connected to the outside of the separator cylinder 24. A heat exchange tube 27 is fixedly connected to the inside of the separator cylinder 24. One end of the heat exchange tube 27 is fixedly connected to a second connecting pipe 25. The other end of the second connecting pipe 25 passes through the top of the heat recovery box 1. The other end of the heat exchange tube 27 is fixedly connected to a first connecting pipe 23. The other end of the first connecting pipe 23 passes through the top of the heat recovery box 1. One end of the feed pipe 26 is fixedly connected to the bottom end of the heat recovery box 1, and the other end of the feed pipe 26 is fixedly connected to one end of the fan 4. A discharge pipe 22 is fixedly connected to one side of the heat recovery box 1.

[0024] The blower 4 operates to send exhaust gas from the feed pipe 26 into the interior of the heat recovery box 1. Spiral heat exchange fins 21 are spirally installed within the cavity formed by the inner wall of the heat recovery box 1 and the outer wall of the partition cylinder 24. The spiral heat exchange fins 21 guide the incoming exhaust gas in a spiral motion, causing it to spiral upwards along the direction of the spiral heat exchange fins 21 and exit from the discharge pipe 22. The heat exchange pipe 27 consists of two staggered U-shaped pipes. The two ends of the two U-shaped pipes are connected to the first connecting pipe 23 and the second connecting pipe 25, respectively. After the heat medium is sent into the heat exchange tube 27 through the second connecting pipe 25, the heat exchange medium exchanges heat with the exhaust gas flowing outside the heat exchange tube 27. Then the heat exchange medium is sent out through the first connecting pipe 23. By extending the flow path of the exhaust gas and the heat exchange medium, the contact time is increased, which allows the coolant to better absorb the heat in the exhaust gas, making the heat exchange closer to the equilibrium state. This allows the temperature of the exhaust gas to drop lower and the temperature of the heat exchange medium to rise higher, thereby improving the degree of heat utilization and the efficiency of heat recovery from the exhaust gas.

[0025] Example 2: Figure 1 and Figure 4 As shown, the pretreatment mechanism 3 includes a first outer shell 31, the other end of the fan 4 is fixedly connected to one end of the first outer shell 31, a connecting shell 35 is installed at the other end of the first outer shell 31, a second outer shell 32 is installed at one end of the connecting shell 35, and a feeding channel 33 is fixedly connected to one end of the second outer shell 32; a connecting screw 37 is installed on the outside of the connecting shell 35, and the two ends of the connecting screw 37 are respectively connected to the outside of the second outer shell 32 and the outside of the first outer shell 31; a connecting plate 34 is fixedly connected inside the second outer shell 32, and a dust removal bag 39 is fixedly connected to the connecting plate 34; a second adsorption plate 38 is fixedly connected inside the connecting shell 35, and a first adsorption plate 36 is fixedly connected inside the first outer shell 31.

[0026] The exhaust gas is fed into the second outer shell 32 through the feed channel 33. First, it passes through the dust bag 39 to filter out dust and impurities inside the exhaust gas. The pre-treated exhaust gas then enters the connecting screw 37. The adsorbent inside the second adsorption plate 38 is either silica gel or activated alumina. These adsorbents have a large specific surface area and a special pore structure, which can selectively adsorb moisture. The second adsorption plate 38 can adsorb the moisture inside the exhaust gas, thus dehydrating the exhaust gas. Subsequently, the exhaust gas enters the first outer shell 31. The adsorbent inside the first adsorption plate 36 is activated carbon. The first adsorption plate 36 can adsorb sulfides in the exhaust gas, thereby pre-treating the exhaust gas, removing corrosive components, reducing corrosion to pipes and equipment, and preventing equipment leaks and damage that could affect normal operation.

[0027] The operating method and working principle of this device are as follows: The exhaust gas is fed into the interior of the second outer shell 32 through the feed channel 33. First, the dust and impurities inside the exhaust gas are filtered out by the dust removal bag 39. The second adsorption plate 38 adsorbs the moisture inside the exhaust gas, thus dehydrating the exhaust gas. Then, the exhaust gas enters the interior of the first outer shell 31, where the first adsorption plate 36 adsorbs the sulfides in the exhaust gas. The fan 4 operates to send the pretreated exhaust gas into the interior of the heat recovery box 1 through the feed pipe 26. The spiral heat exchange plate 21 can spirally guide the incoming exhaust gas and send it out through the discharge pipe 22. The two ends of the heat exchange tube 27 are connected to the first connecting pipe 23 and the second connecting pipe 25, respectively. After the heat exchange medium is sent into the interior of the heat exchange tube 27 through the second connecting pipe 25, the heat exchange medium flows inside the heat exchange tube 27 and exchanges heat with the exhaust gas flowing outside. Then, the heat exchange medium is sent out through the first connecting pipe 23.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A device for recovering heat from exhaust gas, comprising a heat recovery box (1), characterized in that: A fan (4) is installed on one side of the heat recovery box (1), and a pretreatment mechanism (3) is installed at one end of the fan (4). A heat recovery mechanism (2) is installed inside the heat recovery box (1). The heat recovery mechanism (2) includes a separator (24) and a feed pipe (26). The top of the separator (24) is fixedly connected to the inside of the heat recovery box (1). A spiral heat exchange plate (21) is fixedly connected to the outside of the separator (24). A heat exchange tube (27) is fixedly connected to the inside of the separator (24). One end of the heat exchange tube (27) is fixedly connected to a second connecting pipe (25). The other end of the second connecting pipe (25) passes through the top of the heat recovery box (1). The other end of the heat exchange tube (27) is fixedly connected to a first connecting pipe (23). The other end of the first connecting pipe (23) passes through the top of the heat recovery box (1).

2. The exhaust gas heat recovery device according to claim 1, characterized in that: One end of the feed pipe (26) is fixedly connected to the bottom end of the heat recovery box (1), and the other end of the feed pipe (26) is fixedly connected to one end of the fan (4).

3. The exhaust gas heat recovery device according to claim 1, characterized in that: The heat recovery box (1) is fixedly connected to a discharge pipe (22) on one side.

4. The exhaust gas heat recovery device according to claim 1, characterized in that: The pretreatment mechanism (3) includes a first outer shell (31), the other end of the blower (4) is fixedly connected to one end of the first outer shell (31), a connecting shell (35) is installed at the other end of the first outer shell (31), a second outer shell (32) is installed at one end of the connecting shell (35), and a feeding channel (33) is fixedly connected at one end of the second outer shell (32).

5. The exhaust gas heat recovery device according to claim 4, characterized in that: A connecting screw (37) is installed on the outside of the connecting housing (35), and the two ends of the connecting screw (37) are respectively connected to the outside of the second outer housing (32) and the outside of the first outer housing (31).

6. The exhaust gas heat recovery device according to claim 4, characterized in that: A connecting plate (34) is fixedly connected inside the second outer shell (32), and a dust removal bag (39) is fixedly connected to the connecting plate (34).

7. The exhaust gas heat recovery device according to claim 4, characterized in that: The second adsorption plate (38) is fixedly connected inside the connecting housing (35), and the first adsorption plate (36) is fixedly connected inside the first outer housing (31).

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