A high-temperature sintering furnace flue gas cooling device for heat energy recycling

Abstract

This invention discloses a high-temperature sintering furnace flue gas cooling device for heat energy recycling in the field of high-temperature sintering furnace flue gas treatment equipment. The device includes: a cooling medium conveying assembly, a high-temperature section heat exchanger, a medium-temperature section heat exchanger, and a low-temperature section heat exchanger. The flue gas inlet of the high-temperature section heat exchanger is equipped with a second filter. The second filter includes two housings and a filter screen disposed within the housings. The filter screen divides the inner cavity of the housings into a first cavity and a second cavity. The second cavity is connected to the flue gas inlet of the high-temperature section heat exchanger and contains a first detector. The housings are equipped with baffles and a drive assembly. This invention employs a counter-current heat exchange arrangement, where the cooling medium first passes through the low-temperature section and then gradually heats up to the high-temperature section. This allows the cooling medium to gradually absorb heat and gradually increase its temperature from the low-temperature section, finally outputting it to the heat energy utilization unit at the highest temperature in the high-temperature section. This results in a more uniform temperature distribution between the flue gas and the medium within each stage of the heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of high-temperature sintering furnace flue gas treatment equipment, and more specifically to a high-temperature sintering furnace flue gas cooling device that utilizes thermal energy recycling. Background Technology

[0002] High-temperature sintering furnaces are widely used in sintering processes in ceramics, metal powder metallurgy, electronic materials, and other fields. During the sintering process, the temperature inside the furnace is usually above 1200℃, and the temperature of the exhaust gas is between 800℃ and 1000℃, containing a large amount of usable heat energy. Currently, in order to cool down the exhaust gas generated by the sintering furnace and recover heat, a single-stage heat exchange method is usually adopted, that is, the exhaust gas is discharged after exchanging heat with the cooling medium once. However, this will result in a large temperature difference in heat exchange and low heat recovery efficiency. In addition, in order to prevent the exhaust gas from entering the heat exchange equipment with a large amount of dust and particulate matter, a filter is usually used for preliminary filtration. However, the filter will become clogged over a long period of time, resulting in obstructed exhaust gas flow and reduced heat exchange efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature sintering furnace flue gas cooling device that utilizes thermal energy recycling, which solves the problem of the existing single-stage heat exchange method.

[0004] The present invention achieves the above objectives through the following technical solution: a high-temperature sintering furnace flue gas cooling device for heat energy recycling, comprising: a cooling medium conveying component and a high-temperature section heat exchanger, a medium-temperature section heat exchanger and a low-temperature section heat exchanger connected sequentially along the flue gas flow direction, wherein the cooling medium conveying component is used to sequentially input the cooling medium into the low-temperature section heat exchanger, the medium-temperature section heat exchanger and the high-temperature section heat exchanger for heat exchange. The flue gas inlet of the high-temperature section heat exchanger is equipped with a second filter. The second filter includes two housings and a filter screen disposed inside the housings. The filter screen is used to divide the inner cavity of the housing into a first cavity and a second cavity. The second cavity is connected to the flue gas inlet of the high-temperature section heat exchanger and is equipped with a first detector inside. A conduit is connected to the first cavity. The housing is equipped with a baffle and a drive assembly. The baffle is used to cut off the inlet of one housing so that the filter screens in the two housings take turns purifying the flue gas going to the high-temperature section heat exchanger. The housing that purifies the flue gas going to the high-temperature section heat exchanger is the working position. The drive assembly is used to drive the baffle to move and cut off the inlet of the housing when the first detector detects that the flue gas flow rate through the second cavity of the working position housing is lower than a threshold.

[0005] Preferably, the conduit is provided with a valve, and the first cavity is provided with a second detector located on the movement path of the baffle. The valve is used to cut off the conduit after the second detector detects that the baffle is in place.

[0006] Preferably, the outlets of the two ducts are connected to a steam turbine generator, and the flue gas outlet of the steam turbine generator is connected to the flue gas inlet of the medium-temperature heat exchanger and the low-temperature heat exchanger, respectively.

[0007] Preferably, the baffle is provided with two second cleaning components, which are respectively located in the two first cavities. The second cleaning components are used to clean the side of the filter screen facing the first cavity.

[0008] Preferably, the housing is provided with a discharge port to connect the conduit to the first cavity, the discharge port is provided with a filter screen, and the baffle is provided with a first cleaning element for cleaning the filter screen.

[0009] Preferably, the high-temperature sintering furnace flue gas cooling device further includes a PLC controller, the flue gas inlet of the high-temperature section heat exchanger is equipped with a second temperature detector, the inlet of the cooling medium conveying component is equipped with a first temperature detector, and the PLC controller is used to dynamically adjust the temperature of the heat exchange medium input to the low-temperature section heat exchanger by the cooling medium conveying component according to the flue gas temperature detected by the second temperature detector.

[0010] Preferably, the low-temperature heat exchanger is equipped with a third temperature detector to detect the temperature of the heat exchange tube wall of the low-temperature heat exchanger, and the heat exchange medium outlet of the cooling medium conveying assembly is equipped with a three-way valve. The two outlets of the three-way valve are respectively connected to the heating equipment and the heat exchange medium inlet of the low-temperature heat exchanger. The outlet of the heating equipment is connected to the heat exchange medium inlet of the low-temperature heat exchanger.

[0011] Preferably, the outlet of the heating device is equipped with a one-way valve.

[0012] The beneficial effects of this invention are as follows: 1. The counter-current heat exchange arrangement is adopted, in which the cooling medium first passes through the low temperature section and then gradually rises to the high temperature section. This allows the cooling medium to gradually absorb heat and rise in temperature from the low temperature section, and finally output to the heat energy utilization unit at the highest temperature in the high temperature section. This makes the temperature difference distribution between the flue gas and the medium in each heat exchanger more uniform, avoiding the problem of excessive temperature difference at the inlet and insufficient temperature difference at the outlet in traditional single-stage heat exchange. It also reduces irreversible losses in the heat exchange process, significantly improves the thermodynamic perfection of the system, and realizes the efficient recovery of high-grade heat energy. 2. The first detector detects the flue gas flow rate inside the second chamber of the working position. When the flue gas flow rate is lower than the threshold, it indicates that the filter screen of the current working position is blocked. The PLC controller controls the drive component to move the baffle up or down, cutting off the first chamber of the working position and opening the first chamber in the other housing. This allows the upper and lower housings to work alternately, ensuring continuous flue gas purification. During operation, the flue gas is used to clean the non-working filter screen. Through automatic switching and online cleaning, the number of times manual intervention to clean or replace the filter screen is greatly reduced, lowering maintenance costs and ensuring that the flue gas cooling device can work for a long time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the high-temperature sintering furnace flue gas cooling device of the present invention; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a schematic diagram of the structure of the second filter of the present invention; Figure 4 This is a schematic diagram of the connection structure between the housing and the filter screen of the present invention; Figure 5 This is a schematic cross-sectional view of the housing structure of the present invention; Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.

[0014] In the diagram: 1. High-temperature heat exchanger; 2. Medium-temperature heat exchanger; 3. Low-temperature heat exchanger; 4. First filter; 5. Transfer pump; 6. Second filter; 601. Shell; 602. Pipe; 603. Valve; 604. Filter screen; 605. First detector; 606. Baffle; 607. First cleaning component; 608. Second cleaning component; 609. Filter screen; 610. Discharge port; 611. Second detector; 612. Drive assembly; 7. PLC controller; 8. First temperature detector; 9. Second temperature detector; 10. Third temperature detector; 11. Steam turbine generator; 12. Heating equipment; 13. Three-way valve; 14. Check valve. Detailed Implementation

[0015] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content. Example 1

[0016] Please see Figure 1A high-temperature sintering furnace flue gas cooling device for heat energy recycling includes: a cooling medium conveying assembly, a PLC controller 7, a high-temperature section heat exchanger 1, a medium-temperature section heat exchanger 2, and a low-temperature section heat exchanger 3; the high-temperature section heat exchanger 1, the medium-temperature section heat exchanger 2, and the low-temperature section heat exchanger 3 are all shell-and-tube heat exchangers; the shell inlet of the high-temperature section heat exchanger 1 is connected to the flue gas outlet of the high-temperature sintering furnace, the shell outlet of the high-temperature section heat exchanger 1 is connected to the shell inlet of the medium-temperature section heat exchanger 2, and the shell outlet of the medium-temperature section heat exchanger 2 is connected to the shell inlet of the low-temperature section heat exchanger 3; the cooling medium... The conveying assembly includes a conveying pump 5 and a heat exchange medium storage device (such as a storage tank) connected to the inlet of the conveying pump 5. The outlet of the conveying pump 5 is connected to the tube-side inlet of the low-temperature section heat exchanger 3. The tube-side outlet of the low-temperature section heat exchanger 3 is connected to the tube-side inlet of the medium-temperature section heat exchanger 2. The tube-side outlet of the medium-temperature section heat exchanger 2 is connected to the tube-side inlet of the high-temperature section heat exchanger 1. The tube-side outlet of the high-temperature section heat exchanger 1 is connected to the heat-using area through a pipeline, and the heat exchange medium that absorbs heat is input into the heat-using area. After the heat is consumed in the heat-using area, it returns to the heat exchange medium storage device.

[0017] It should be noted that the shell outlet of the low-temperature heat exchanger 3 is equipped with a first filter 4, which is a bag filter and an activated carbon adsorption tower, to filter and purify the flue gas that has absorbed heat, so that its emissions meet the standards.

[0018] Please see Figure 1 , Figure 3 , Figure 4 and Figure 6 The flue gas inlet of the high-temperature section heat exchanger 1 is equipped with a second filter 6; The second filter 6 includes two housings 601 (the two housings 601 are arranged vertically). Each housing 601 has a filter screen 604 (the filter screen 604 is made of a high-temperature resistant material, such as a ceramic filter screen) inside its inner cavity. The filter screen 604 divides the inner cavity of the housing 601 into a first cavity and a second cavity (the first cavity and the second cavity are arranged horizontally). The outlets of the two second cavities are connected to the flue gas inlet of the high-temperature heat exchanger 1 via a pipe (T-junction). A first detector 605 (a gas flow detector, the probe of which is treated for high-temperature resistance) is installed inside the second cavity. The inlets of the two first cavities are connected to the exhaust port of the high-temperature sintering furnace via a T-junction. A conduit 602 is connected to the first cavity. A baffle 606 is provided between the two housings 601. A through-hole is opened on the side of each housing 601 that is close to each other. The upper and lower ends of the baffle 606 pass through the two through-holes respectively. The baffle 606 is located inside the inner cavity of one housing 601, and the baffle 606 cuts off the first cavity of one housing 601 (e.g., Figure 4As shown, the first cavity of the lower first housing 601 is cut off. A drive assembly 612 is provided on the housing 601. The drive assembly 612 includes two motors and rollers on the output shafts of the two motors. The two motors are located on the left and right sides of the baffle 606, respectively, and the two rollers are respectively attached to the left and right side walls of the baffle 606.

[0019] It should be noted that the high-temperature sintering furnace flue gas cooling device works as follows: after the high-temperature flue gas generated by the sintering furnace is discharged, it enters the upper shell 601 of the second filter 6. After preliminary filtration by the filter screen 604 of the shell 601, the flue gas is discharged and split into two streams. One part of the flue gas enters the inner cavity of the lower shell 601 through the outlet of the lower shell 601 through a pipe, then passes through the lower filter screen 604 from right to left, and is discharged from the lower conduit 602. The other part of the flue gas flows sequentially through the high-temperature section heat exchanger 1, the medium-temperature section heat exchanger 2, and the low-temperature section heat exchanger 3, with heat exchange media (such as water or gas). Driven by the transfer pump 5, the flue gas flows sequentially through the low-temperature heat exchanger 3, the medium-temperature heat exchanger 2, and the high-temperature heat exchanger 1 in the opposite direction to the flue gas flow, performing counter-current stepped heat exchange. The high-temperature medium heated by the high-temperature heat exchanger 1 enters the heat energy utilization unit and is distributed to external heat-using equipment by the heat energy distributor for heat energy utilization. The heat exchange medium that has absorbed heat returns to the heat exchange medium storage device for circulation. The flue gas cooled by heat exchange is purified and discharged in compliance with standards. When the second filter 6 operates for a long time, causing excessive impurities to be intercepted by the upper filter screen 604 and resulting in partial blockage, the impurities are discharged through the upper second cavity. As the amount of flue gas decreases, the upper first detector 605 detects this information and sends it to the PLC controller 7, which then controls the drive assembly 612 (the motor drives the roller to rotate, causing the baffle 606 to move up or down). This causes the baffle 606 to move upward, cutting off the upper first cavity and opening the lower first cavity. At this time, the flue gas entering the second filter 6 will enter the lower housing 601. After being initially filtered by the filter screen 604 of the housing 601, the flue gas is discharged and split into two streams. One part of the flue gas enters the upper housing 601 through a pipe from the outlet of the upper housing 601. The flue gas passes through the upper filter 604 from right to left and is discharged from the upper duct 602. Another part of the flue gas enters the high-temperature heat exchanger 1 normally. The flue gas passes through the upper filter 604 from right to left and impacts the filter holes of the upper filter 604, which has the effect of flushing down impurities and cleaning the filter 604. This allows the upper and lower shells 601 to work alternately, ensuring the efficiency of flue gas filtration. During operation, the flue gas is used to clean the non-working filter 604, extending the working time of the filter 604, reducing the chance of manual cleaning, and ensuring that the flue gas cooling device can work for a long time.

[0020] It should also be noted that the bottom of the first cavity has an opening, and the shell 601 has a door panel for sealing the opening; when the opening is opened, the flue gas will blow the impurities inside the first cavity out from the opening, thereby cleaning the accumulated impurities inside the first cavity.

[0021] In this embodiment, as a further optimization, please refer to... Figure 3 , Figure 4 and Figure 5 The conduit 602 is equipped with a valve 603 (a solenoid valve), and each of the two first cavities is equipped with a second detector 611 (such as a pressure sensor). The two second detectors 611 are located on the upper and lower sides of the baffle 606, respectively. When the baffle 606 moves upward to cut off the first cavity of the upper housing 601, the baffle 606 presses the upper second detector 611. After receiving the information, the PLC controller 7 controls the upper valve 603 to open and the lower valve 603 to close. Conversely, when the baffle 606 moves downward to cut off the first cavity of the lower housing 601, the PLC controller 7 controls the lower valve 603 to open and the upper valve 603 to close, so that the flue gas can flow in the two housings 601 according to the plan.

[0022] In this embodiment, as a further optimization, please refer to... Figure 1 The outlets of the two ducts 602 are connected to the steam turbine generator 11. After cleaning the filter screen 604, the flue gas is discharged from the duct 602 and enters the steam turbine generator 11 to drive the steam turbine generator 11 to generate electricity, recover energy from cleaning the filter screen 604, and supply power to the electrical equipment of the flue gas cooling device. The flue gas outlet of the steam turbine generator 11 is connected to the flue gas inlet of the medium-temperature section heat exchanger 2 and the low-temperature section heat exchanger 3 through a three-way pipe. A valve is installed at the outlet of the three-way pipe to control the flow direction of the flue gas discharged from the steam turbine generator 11, so that the flue gas can be introduced into the medium-temperature section heat exchanger 2 or the low-temperature section heat exchanger 3 for further waste heat recovery.

[0023] In this embodiment, as a further optimization, please refer to... Figure 4 The side wall of the baffle 606 is provided with two second cleaning components 608 (such as scrapers). The two second cleaning components 608 are located in the inner cavities of the two first cavities and are respectively attached to the side of the two filter screens 604 facing the first cavity. During the upward or downward movement of the baffle 606, the second cleaning components 608 are moved along with it to clean the filter screens 604, further preventing the filter screens 604 from clogging and enabling the second filter 6 to work for a long time.

[0024] In this embodiment, as a further optimization, please refer to... Figure 4The outer wall of the housing 601 is provided with a discharge port 610, through which the conduit 602 is connected to the first cavity. The inner cavity of the discharge port 610 is provided with a filter screen 609 (made of the same material as the filter screen 604). The baffle 606 is provided with two first cleaning components 607 (such as scrapers), which are located inside the two cavities respectively. When the baffle 606 moves up or down, the second cleaning component 608 moves accordingly to clean the impurities attached to the filter screen 609. Example 2

[0025] As a further optimization of Example 1, please refer to Figure 1 The flue gas inlet of the high-temperature section heat exchanger 1 is equipped with a second temperature detector 9 (gas temperature sensor, the sensor probe is treated with high temperature resistance or made of rotating high-temperature resistant material), and the inlet of the cooling medium conveying component is equipped with a first temperature detector 8 (temperature sensor). The second temperature detector 9 is used to obtain the temperature of the flue gas entering the flue gas cooling device, and the first temperature detector 8 is used to obtain the initial temperature of the heat exchange medium. The PLC controller 7 dynamically adjusts the temperature of the heat exchange medium input to the low-temperature section heat exchanger 3 of the cooling medium conveying component according to the flue gas temperature detected by the second temperature detector 9, so as to reasonably control the temperature difference between the flue gas and the heat exchange medium, improve the heat exchange efficiency, and reduce the probability of waste heat.

[0026] In this embodiment, as a further optimization, please refer to... Figure 1 and Figure 2 The low-temperature heat exchanger 3 is equipped with a third temperature detector 10 (temperature sensor) to detect the temperature of the inner wall of the heat exchange tube of the low-temperature heat exchanger 3. The heat exchange medium outlet of the transfer pump 5 is equipped with a three-way valve 13. The two outlets of the three-way valve 13 are respectively connected to the heating device 12 and the heat exchange medium inlet of the low-temperature heat exchanger 3. The outlet of the heating device 12 is connected to the heat exchange medium inlet of the low-temperature heat exchanger 3. When the third temperature detector 10 detects that the temperature of the inner wall of the heat exchange tube of the low-temperature heat exchanger 3 is lower than the preset value, the PLC controller 7 controls the three-way valve to change direction, so that the heat exchange medium discharged by the transfer pump 5 enters the heating device 12 for heating and temperature rise, and then enters the heat exchange tube of the low-temperature heat exchanger 3 to increase the temperature of the inner wall of the heat exchange tube of the low-temperature heat exchanger 3 and avoid acid dew point corrosion.

[0027] In this embodiment, as a further optimization, please refer to... Figure 1 and Figure 2 The outlet of the heating device 12 is equipped with a one-way valve 14 to prevent backflow.

[0028] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A high-temperature sintering furnace flue gas cooling device for heat energy recycling, characterized in that, include: The cooling medium conveying assembly and the high-temperature section heat exchanger (1), the medium-temperature section heat exchanger (2) and the low-temperature section heat exchanger (3) connected in sequence along the flue gas flow direction are used to sequentially input the cooling medium into the low-temperature section heat exchanger (3), the medium-temperature section heat exchanger (2) and the high-temperature section heat exchanger (1) for heat exchange. The flue gas inlet of the high-temperature heat exchanger (1) is provided with a second filter (6). The second filter (6) includes two housings (601) and a filter screen (604) disposed inside the housings (601). The filter screen (604) is used to divide the inner cavity of the housing (601) into a first cavity and a second cavity. The second cavity is connected to the flue gas inlet of the high-temperature heat exchanger (1) and is provided with a first detector (605) inside. A conduit (602) is connected to the first cavity. A baffle (606) and a drive are provided on the housing (601). The drive assembly (612) is used to cut off the inlet of one housing (601) so that the filters (604) in the two housings (601) take turns purifying the flue gas going to the high-temperature heat exchanger (1), and the housing (601) purifying the flue gas going to the high-temperature heat exchanger (1) is in the working position. The drive assembly (612) is used to drive the baffle (606) to move and cut off the inlet of the housing (601) when the first detector (605) detects that the flue gas flow rate through the second cavity of the working position housing (601) is lower than the threshold.

2. The high-temperature sintering furnace flue gas cooling device of claim 1, wherein, The conduit (602) is provided with a valve (603), and the first cavity is provided with a second detector (611) located on the moving path of the baffle (606). The valve (603) is used to cut off the conduit (602) after the second detector (611) detects that the baffle (606) is in place.

3. The high-temperature sintering furnace flue gas cooling device for thermal energy recycling according to claim 2, characterized in that, The outlets of the two ducts (602) are connected to a steam turbine generator (11), and the flue gas outlet of the steam turbine generator (11) is connected to the flue gas inlet of the medium-temperature heat exchanger (2) and the low-temperature heat exchanger (3), respectively.

4. The high-temperature sintering furnace flue gas cooling device for heat energy recycling according to claim 1, characterized in that, The baffle (606) is provided with two second cleaning components (608), which are located in the two first cavities respectively. The second cleaning components (608) are used to clean the side of the filter screen (604) facing the first cavity.

5. A high-temperature sintering furnace flue gas cooling device for heat energy recycling according to claim 1, characterized in that, The housing (601) is provided with a discharge port (610) so that the conduit (602) is connected to the first cavity. A filter screen (609) is provided inside the discharge port (610). A first cleaning component (607) for cleaning the filter screen (609) is provided on the baffle (606).

6. The high-temperature sintering furnace flue gas cooling device for heat energy recycling according to claim 1, characterized in that, The high-temperature sintering furnace flue gas cooling device also includes a PLC controller (7). The flue gas inlet of the high-temperature section heat exchanger (1) is equipped with a second temperature detector (9), and the inlet of the cooling medium conveying component is equipped with a first temperature detector (8). The PLC controller (7) is used to dynamically adjust the temperature of the heat exchange medium input to the low-temperature section heat exchanger (3) of the cooling medium conveying component according to the flue gas temperature detected by the second temperature detector (9).

7. A high-temperature sintering furnace flue gas cooling device for heat energy recycling according to claim 6, characterized in that, The low-temperature heat exchanger (3) is equipped with a third temperature detector (10) to detect the heat exchange tube wall temperature of the low-temperature heat exchanger (3). The heat exchange medium outlet of the cooling medium conveying assembly is equipped with a three-way valve (13). The two outlets of the three-way valve (13) are respectively connected to the heating device (12) and the heat exchange medium inlet of the low-temperature heat exchanger (3). The outlet of the heating device (12) is connected to the heat exchange medium inlet of the low-temperature heat exchanger (3).

8. A high-temperature sintering furnace flue gas cooling device for heat energy recycling according to claim 7, characterized in that, The outlet of the heating device (12) is equipped with a one-way valve (14).

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