Medium and low temperature waste gas heat exchange utilization device and method

Abstract

The invention discloses a medium and low temperature waste gas heat exchange utilization device and method, and relates to the field of waste gas heat exchange utilization, the medium and low temperature waste gas heat exchange utilization device comprises a machine body, a medium feeding pipe and a medium discharging pipe are fixedly installed on four slopes of the top and the bottom of the machine body respectively in a penetrating mode, and a separation column is fixedly installed at the center position in an inner cavity of the machine body; the inner cavity of the machine body is divided into four heat exchange cavities through the separation columns, a heat exchange medium pipe row is installed in each heat exchange cavity, and an inlet in the head end of each heat exchange medium pipe row communicates with the medium feeding pipe. When the temperature is not high, only one heat exchange channel is adopted to complete waste gas heat exchange utilization, and when the temperature is high, the waste gas is transmitted to the multiple heat exchange channels for waste gas heat exchange utilization in a split-flow mode, so that the heat utilization rate of the waste gas is maximized.

Description

Technical Field

[0001] The present invention relates to the field of waste gas heat exchange and utilization, and in particular to a medium- and low-temperature waste gas heat exchange and utilization device and method. Background Art

[0002] Medium and low temperature waste gas recovery refers to the heat recovery of industrial waste gas with a temperature range of usually between 100℃ and 400℃. Although the waste gas in this temperature range does not contain extremely high density of heat energy like high temperature waste gas, it still has considerable recovery value. Through appropriate recovery technology, this part of energy can be effectively utilized to reduce the energy consumption and operating costs of enterprises, while reducing the impact on the environment;

[0003] In the process of using traditional exhaust gas heat exchange and utilization devices, we found that when recycling exhaust gas to preheat the heat exchange medium, if the exhaust gas temperature is too high, it will cause the medium to be overheated. At the same time, there is a great possibility that the final output exhaust gas temperature will still be high, resulting in serious waste. If the exhaust temperature is too low, once the amount of preheated medium is large, the medium preheating temperature will not meet the expected standard and it will be difficult to adjust according to the exhaust gas temperature, which is very inconvenient to use. Summary of the invention

[0004] The object of the present invention is to provide a medium- and low-temperature exhaust gas heat exchange utilization device and method to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a medium-low temperature exhaust gas heat exchange and utilization device, comprising a body, wherein a medium feed pipe and a medium discharge pipe are fixedly installed on four inclined surfaces at the top and bottom of the body respectively, a partition column is fixedly installed at a central position in the inner cavity of the body, the partition column divides the inner cavity of the body into four heat exchange cavities, and a heat exchange medium pipe row is installed in each of the heat exchange cavities respectively, the head end inlet of the heat exchange medium pipe row is communicated with the medium feed pipe, and the tail end outlet of the heat exchange medium pipe row is communicated with the corresponding medium discharge pipe, an exhaust cavity is provided in the partition column, the top opening of the exhaust cavity is communicated with the air inlet at the top of the body, a control cylinder is rotatably installed in the exhaust cavity, a temperature sensor is fixedly installed at the bottom of the inner cavity of the control cylinder, a servo motor is fixedly installed at the bottom of the exhaust cavity, the temperature sensor is electrically connected to the servo motor, and the output end shaft of the servo motor is fixedly connected to the control cylinder.

[0006] Preferably, the partition column is provided with air outlet four, air outlet three, air outlet two and air outlet one from top to bottom, and the angle interval between air outlet one, air outlet two, air outlet three and air outlet four along the counterclockwise direction is ninety degrees.

[0007] Preferably, the control cylinder is provided with strip holes distributed from top to bottom, and closed areas are respectively provided in the strip holes of the other three layers except the strip holes at the bottom, and the closed areas are gradually doubled in area from bottom to top.

[0008] Preferably, an exhaust gas inlet pipe is fixedly installed at the air inlet at the top of the body, the bottom end of the exhaust gas inlet pipe is fixedly connected to the top of the partition column, and an exhaust gas exhaust pipe is fixedly installed at the air outlet at the bottom end of the body.

[0009] Preferably, the heat exchange medium tube array is arranged in a zigzag shape from top to bottom, and is connected end to end at the bend.

[0010] In addition, the present invention also provides a method for using a medium- and low-temperature exhaust gas heat exchange and utilization device, comprising the following steps:

[0011] S1: connect the exhaust gas discharge pipe and the exhaust gas intake pipe to allow the exhaust gas to be directly discharged into the exhaust gas intake pipe;

[0012] S2: Select a medium that needs heat exchange and connect it to the medium feed pipe. The medium can be water or air. One medium can be introduced into each heat exchange medium tube row.

[0013] S3: When the exhaust gas enters the inner cavity of the control cylinder through the exhaust gas inlet pipe, the strip hole at the bottom of the control cylinder is always connected to the outlet hole 1, while the outlet holes 2, 3 and 4 are respectively closed by the corresponding closed areas, so the exhaust gas is first discharged from the outlet hole 1 and enters the corresponding heat exchange cavity;

[0014] S4: The exhaust gas descends layer by layer along the heat exchange medium tube row, and fully contacts with the surface of the heat exchange medium tube row during the descending process, thereby completing heat exchange with the internal medium, so that the medium in the heat exchange medium tube row achieves a preheating effect.

[0015] Preferably, in S3, when the exhaust gas enters the inner cavity of the control cylinder, the temperature sensor monitors the temperature of the exhaust gas in real time, and the temperature sensor is provided with three levels of temperature monitoring, namely the first level, the second level and the third level.

[0016] Preferably, in S3, when the temperature sensor detects that the temperature has reached the first gear, the servo motor is driven to start, and the shaft at the output end of the servo motor rotates ninety degrees. When the temperature reaches the second gear, the servo motor is driven to start, and the shaft at the output end of the servo motor rotates one hundred and eighty degrees. When the temperature reaches the third gear, the servo motor is driven to start, and the shaft at the output end of the servo motor rotates two hundred and seventy degrees.

[0017] Preferably, the first gear temperature range is controlled within 100-200°C, the second gear temperature range is controlled within 200-300°C, and the third gear temperature range is controlled within 300-400°C.

[0018] In summary, the beneficial effects of the present invention are:

[0019] The present invention monitors the medium and low temperature exhaust gas temperatures. When the temperature is not high, only one heat exchange channel is used to complete the heat exchange and utilization of the exhaust gas. When the temperature is relatively high, the exhaust gas is transferred to multiple heat exchange channels by diversion for heat exchange and utilization of the exhaust gas, so that the heat utilization rate of the exhaust gas is maximized, and it is effectively avoided that when the exhaust gas temperature is not high, if a large amount of heat exchange medium is heat exchanged, the medium will not reach the expected temperature and the medium needs to be reheated. When the exhaust gas temperature is too high, if the heat exchange medium is small, the medium temperature will cause it to rise too high. At the same time, after the heat exchange is completed, the temperature of the exhaust gas is at a relatively high level, resulting in waste of exhaust gas heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of a medium- and low-temperature exhaust gas heat exchange and utilization device of the present invention;

[0022] Figure 2 This is a schematic diagram of the main cross-sectional structure of a medium- and low-temperature exhaust gas heat exchange and utilization device of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a component separation column in a medium- and low-temperature exhaust gas heat exchange and utilization device of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a control cylinder of a component in a medium- and low-temperature exhaust gas heat exchange and utilization device of the present invention;

[0025] Figure 5 It is a schematic diagram of the main cross-sectional structure of a component separation column and a control cylinder 18 in a medium- and low-temperature exhaust gas heat exchange and utilization device of the present invention.

[0026] The symbols in the accompanying drawings are described as follows: body 10; medium feed pipe 11; exhaust gas inlet pipe 12; medium discharge pipe 13; exhaust gas exhaust pipe 14; partition column 15; exhaust chamber 16; servo motor 17; control cylinder 18; temperature sensor 19; heat exchange medium pipe row 20; outlet hole 1 21; outlet hole 2 22; outlet hole 3 23; outlet hole 4 24; closed area 25; strip hole 26. DETAILED DESCRIPTION

[0027] The present invention will now be further described in detail in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic way, and therefore they only show the structures related to the present invention.

[0028] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0030] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0031] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of at least two elements or the interaction relationship between at least two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Combine the following Figure 1-5 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are the same as Figure 2The view direction is consistent in front, back, left, right, up and down directions. Figure 2 is a front view of the device of the present invention, Figure 2 The directions shown are consistent with the front, back, left, right, up and down directions of the device of the present invention when viewed from the front.

[0033] This invention project is funded by Zhejiang Province's "Pioneer Leader + X" R&D project (2024C03117). Please refer to Figure 1-5 , an embodiment of the present invention: a medium-low temperature exhaust gas heat exchange and utilization device, comprising a body 10, wherein a medium feed pipe 11 and a medium discharge pipe 13 are respectively fixedly installed on the four inclined surfaces at the top and bottom of the body 10, wherein the medium feed pipe 11 is used to pass a heat exchange medium, and the medium is discharged from the medium discharge pipe 13 at the bottom to form a cycle, and a partition column 15 is fixedly installed at the center position in the inner cavity of the body 10, wherein the partition column 15 divides the inner cavity of the body 10 into four heat exchange cavities, wherein each of the heat exchange cavities is respectively installed with a heat exchange medium pipe row 20, wherein the heat exchange medium pipe row 20 is arranged in a zigzag shape from top to bottom, and is connected end to end at the bend, wherein the heat The inlet at the head end of the heat exchange medium tube row 20 is interconnected with the medium feed pipe 11, and the outlet at the tail end of the heat exchange medium tube row 20 is interconnected with the corresponding medium discharge pipe 13. The heat exchange medium tube row 20 is made of a material with strong thermal conductivity, which can be copper, aluminum or ceramic and other materials. Different heat exchange media, such as gas or liquid that needs to be preheated, specifically water or air, can be introduced into the four heat exchange medium tube rows 20 respectively. An exhaust gas inlet pipe 12 is fixedly installed at the air inlet at the top of the body 10, and the bottom end of the exhaust gas inlet pipe 12 is fixedly connected to the top of the partition column 15. An exhaust gas exhaust pipe 14 is fixedly installed at the bottom air outlet of the body 10. An exhaust chamber 16 is provided in the partition column 15, and the top opening of the exhaust chamber 16 is communicated with the air inlet at the top of the body 10, a control cylinder 18 is rotatably installed in the exhaust chamber 16, a temperature sensor 19 is fixedly installed at the bottom of the inner cavity of the control cylinder 18, a servo motor 17 is fixedly installed at the bottom of the exhaust chamber 16, the temperature sensor 19 is electrically connected to the servo motor 17, and the output end shaft of the servo motor 17 is fixedly connected to the control cylinder 18.

[0034] It should be noted that, in the present embodiment, the partition column 15 is provided with a fourth air outlet 24, a third air outlet 23, a second air outlet 22 and a first air outlet 21 distributed from top to bottom, and the air outlet 1 21, the second air outlet 22, the third air outlet 23 and the fourth air outlet 24 are spaced at an angle of ninety degrees in the counterclockwise direction, and the first air outlet 21, the second air outlet 22, the third air outlet 23 and the fourth air outlet 24 respectively correspond to a heat exchange cavity, through which the exhaust gas can enter the corresponding heat exchange cavity for heat exchange;

[0035] It should also be noted that, in this embodiment, the control cylinder 18 is provided with strip holes 26 from top to bottom, and the strip holes 26 of the other three layers except the strip holes 26 at the bottom are respectively provided with closed areas 25, and the closed areas 25 are gradually doubled from bottom to top. There is no closed area 25 in the bottommost strip hole 26, and there is a closed area 25 in the second layer of strip holes 26 from bottom to top, and one closed area 25 can completely cover the second air outlet hole 22, and the strip holes of the third layer are There are two continuous closed areas 25 in 26, so that half of the third layer is strip holes 26 and half is closed areas 25, and the top fourth layer has three continuous closed areas 25, and the remaining 90-degree arc range is strip holes 26. The strip holes 26 at the bottom of the control cylinder 18 are always connected with the air outlet 1 21, and one opening needs to be kept for the recycling of waste gas, while the air outlet 2 22, the air outlet 3 23 and the air outlet 4 24 are initially closed by the corresponding closed areas 25;

[0036] When the waste gas is recycled, the waste gas enters the inner cavity of the control cylinder 18 through the waste gas inlet pipe 12, and the medium to be preheated is introduced into the medium feed pipe 11. At this time, the temperature sensor 19 monitors the temperature of the waste gas. At the same time, the temperature sensor 19 is provided with three gears of temperature monitoring, namely the first gear, the second gear and the third gear. The temperature range of the first gear is controlled at 100-200°C, the temperature range of the second gear is controlled at 200-300°C, and the temperature range of the third gear is controlled at 300-400°C. When the waste gas temperature is monitored at the first gear, the servo motor 17 is driven to start, thereby driving the control cylinder 18 to rotate counterclockwise by 90 degrees, so that the closed area 25 of the second layer in the control cylinder 18 is disconnected from the air outlet 22, thereby part of the waste gas is discharged from the exhaust gas outlet 22. The air is discharged from the second air outlet 22 into the corresponding heat exchange cavity, and at the same time, the corresponding medium feed pipe 11 is connected to allow the medium to enter the heat exchange medium pipe row 20, thereby forming two diversions within the exhaust gas temperature range of the first gear. When the monitored exhaust gas temperature is at the second gear, the drive servo motor 17 is started, thereby driving the control cylinder 18 to rotate 180 degrees counterclockwise. At this time, the closed areas 25 of the second and third layers are all separated from the air outlet 22 and the air outlet 3 23, thereby forming three diversions. When the monitored exhaust gas temperature is at the third gear, the drive servo motor 17 is started, thereby driving the control cylinder 18 to rotate 270 degrees counterclockwise. At this time, the closed areas 25 of the second, third and fourth layers are all separated from the air outlet 22, the air outlet 3 23 and the air outlet 4 24, thereby forming four diversions.

[0037] The medium and low temperature exhaust gas temperatures are monitored. When the temperature is not high, only one heat exchange channel is used to complete the heat exchange of the exhaust gas. When the temperature is relatively high, the exhaust gas is transferred to multiple heat exchange channels by diversion for heat exchange of the exhaust gas, so that the heat utilization rate of the exhaust gas is maximized. This effectively avoids the situation where a large amount of heat exchange medium is exchanged when the exhaust gas temperature is not high, which will cause the medium to fail to reach the expected temperature and require reheating of the medium. When the exhaust gas temperature is too high, if the heat exchange medium is small, the medium temperature will rise too high. At the same time, the temperature of the exhaust gas is at a relatively high level after the heat exchange, resulting in waste of exhaust gas heat.

[0038] In addition, the present invention also provides a method for using a medium- and low-temperature exhaust gas heat exchange and utilization device, comprising the following steps:

[0039] S1: connecting the exhaust gas discharge pipe to the exhaust gas intake pipe 12, so that the exhaust gas is directly discharged into the exhaust gas intake pipe 12;

[0040] S2: Select a medium that needs heat exchange and connect it to the medium feed pipe 11. The medium can be water or air. One medium can be introduced into each heat exchange medium pipe row 20.

[0041] S3: When the exhaust gas enters the inner cavity of the control cylinder 18 through the exhaust gas inlet pipe 12, the strip hole 26 at the bottom of the control cylinder 18 is always connected to the outlet hole 1 21, and the outlet hole 22, the outlet hole 3 23 and the outlet hole 4 24 are respectively closed by the corresponding closed area 25, so the exhaust gas is first discharged from the outlet hole 1 21 and enters the corresponding heat exchange cavity. When the exhaust gas enters the inner cavity of the control cylinder 18, the temperature sensor 19 monitors the temperature of the exhaust gas in real time. At the same time, the temperature sensor 19 The device 19 is provided with three gears of temperature monitoring, namely the first gear, the second gear and the third gear. When the temperature sensor 19 detects that the temperature reaches the first gear, the servo motor 17 is driven to start, and the output shaft of the servo motor 17 rotates ninety degrees. When the temperature reaches the second gear, the servo motor 17 is driven to start, and the output shaft of the servo motor 17 rotates one hundred and eighty degrees. When the temperature reaches the third gear, the servo motor 17 is driven to start, and the output shaft of the servo motor 17 rotates two hundred and seventy degrees.

[0042] S4: the exhaust gas descends layer by layer along the heat exchange medium tube row 20, and fully contacts the surface of the heat exchange medium tube row 20 during the descending process, thereby completing heat exchange with the internal medium, so that the medium in the heat exchange medium tube row 20 achieves a preheating effect;

[0043] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited to it. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the invention. Therefore, the protection scope of the invention should be based on the protection scope defined in the claims.

Claims

1. A medium-low temperature exhaust gas heat exchange and utilization device, comprising a body (10), characterized in that: A medium feed pipe (11) and a medium discharge pipe (13) are fixedly installed on the four inclined surfaces at the top and bottom of the machine body (10), and a partition column (15) is fixedly installed at the center position in the inner cavity of the machine body (10). The partition column (15) divides the inner cavity of the machine body (10) into four heat exchange cavities. A heat exchange medium pipe row (20) is installed in each of the heat exchange cavities. The head end inlet of the heat exchange medium pipe row (20) is connected to the medium feed pipe (11), and the tail end outlet of the heat exchange medium pipe row (20) is connected to the corresponding medium discharge pipe ( 13) are interconnected, an exhaust chamber (16) is provided in the partition column (15), the top opening of the exhaust chamber (16) is interconnected with the air inlet at the top of the machine body (10), a control cylinder (18) is rotatably mounted in the exhaust chamber (16), a temperature sensor (19) is fixedly mounted at the bottom of the inner cavity of the control cylinder (18), a servo motor (17) is fixedly mounted at the bottom of the exhaust chamber (16), the temperature sensor (19) is electrically connected to the servo motor (17), and the output end shaft of the servo motor (17) is fixedly connected to the control cylinder (18).

2. A medium and low temperature exhaust gas heat exchange and utilization device according to claim 1, characterized in that: The partition column (15) is provided with a fourth air outlet hole (24), a third air outlet hole (23), a second air outlet hole (22) and a first air outlet hole (21) from top to bottom, and the angle interval between the first air outlet hole (21), the second air outlet hole (22), the third air outlet hole (23) and the fourth air outlet hole (24) along the counterclockwise direction is ninety degrees.

3. A medium and low temperature exhaust gas heat exchange and utilization device according to claim 2, characterized in that: The control cylinder (18) is provided with strip holes (26) distributed from top to bottom, and except for the strip holes (26) at the bottom, the strip holes (26) at the other three layers are respectively provided with closed areas (25), and the closed areas (25) are gradually doubled in size from bottom to top.

4. A medium and low temperature exhaust gas heat exchange and utilization device according to claim 3, characterized in that: An exhaust gas intake pipe (12) is fixedly installed at the air inlet at the top of the machine body (10), the bottom end of the exhaust gas intake pipe (12) is fixedly connected to the top of the partition column (15), and an exhaust gas exhaust pipe (14) is fixedly installed at the air outlet at the bottom end of the machine body (10).

5. The medium and low temperature exhaust gas heat exchange and utilization device according to claim 4, characterized in that: The heat exchange medium tube row (20) is arranged in a zigzag shape from top to bottom, and is connected end to end at the bend.

6. A method for using a medium- and low-temperature exhaust gas heat exchange and utilization device, characterized in that: The following steps are involved: S1: connecting the exhaust gas discharge pipe and the exhaust gas intake pipe (12) so that the exhaust gas is directly discharged into the exhaust gas intake pipe (12); S2: Select a medium that needs heat exchange and connect it to the medium feed pipe (11), wherein the medium may be water or air, and each heat exchange medium pipe row (20) may be fed with one medium; S3: When the exhaust gas enters the inner cavity of the control cylinder (18) through the exhaust gas inlet pipe (12), the strip hole (26) at the bottom of the control cylinder (18) is always connected to the first outlet hole (21), while the second outlet hole (22), the third outlet hole (23) and the fourth outlet hole (24) are respectively closed by the corresponding closed areas (25), so the exhaust gas is first discharged from the first outlet hole (21) and enters the corresponding heat exchange cavity; S4: the exhaust gas descends layer by layer along the heat exchange medium tube row (20), and in the process of descending, fully contacts the surface of the heat exchange medium tube row (20), thereby completing heat exchange with the internal medium, so that the medium in the heat exchange medium tube row (20) achieves a preheating effect.

7. The method for using the medium- and low-temperature exhaust gas heat exchange and utilization device according to claim 6, characterized in that: In the above-mentioned S3, when the exhaust gas enters the inner cavity of the control cylinder (18), the temperature sensor (19) monitors the temperature of the exhaust gas in real time. Meanwhile, the temperature sensor (19) is provided with three levels of temperature monitoring, namely, the first level, the second level and the third level.

8. The method for using the medium- and low-temperature exhaust gas heat exchange and utilization device according to claim 7, characterized in that: In S3, when the temperature sensor (19) detects that the temperature reaches the first gear, the servo motor (17) is driven to start, and the output end shaft of the servo motor (17) rotates 90 degrees. When the temperature reaches the second gear, the servo motor (17) is driven to start, and the output end shaft of the servo motor (17) rotates 180 degrees. When the temperature reaches the third gear, the servo motor (17) is driven to start, and the output end shaft of the servo motor (17) rotates 270 degrees.

9. The method for using the medium- and low-temperature exhaust gas heat exchange and utilization device according to claim 8, characterized in that: The first gear temperature range is controlled within 100-200°C, the second gear temperature range is controlled within 200-300°C, and the third gear temperature range is controlled within 300-400°C.

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