A gypsum board dryer exhaust gas treatment system

Abstract

This invention discloses a waste gas treatment system for a gypsum board dryer, comprising a first drying zone, a second drying zone, and a third drying zone. The first, second, and third drying zones are respectively connected to a first waste gas treatment pipe, a second waste gas treatment pipe, and a third waste gas treatment pipe for externally conveying waste gas. Waste gas discharged from the first and second waste gas treatment pipes can be input into the third drying zone and discharged through the exhaust end of the third waste gas treatment pipe. In this waste gas treatment system, the waste gas temperature in the first and second drying zones is not directly exchanged for heat before being discharged. Instead, it is introduced into the third drying zone to perform work, and then uniformly enters the heat exchanger from all three zones for heat exchange before being discharged. This reduces the primary heat source supply to the third drying zone, and the heat exchange achieved through work also significantly reduces the temperature of the flue gas discharged from the first and second drying zones.

Description

Technical Field

[0001] This invention relates to the technical field of waste gas treatment systems, specifically a waste gas treatment system for a gypsum board dryer. Background Technology

[0002] Gypsum board production lines typically utilize petrochemical fuels to meet the heat energy requirements of the gypsum board production process. This heat energy is mainly used in production stages such as raw material supply, gypsum sintering, and drying of the gypsum board.

[0003] In the gypsum board drying stage, the heat energy generated by fuel combustion is used to dry the continuously passing gypsum board. The gypsum board drying system has three zones: the accelerated drying stage (corresponding to the first drying zone), the constant speed drying zone (corresponding to the second drying zone), and the deceleration drying stage (corresponding to the third drying zone). Although the existing waste gas treatment system can utilize the residual heat in the final waste gas, the utilization of residual heat is not thorough enough.

[0004] In particular, the utilization of waste gas in the first and second drying zones is problematic. The waste gas in the first and second drying zones is mainly discharged to the outside through heat exchangers. Although the energy after heat exchange can be utilized, the temperature of the waste gas in the first and second drying zones is high. Even after heat exchange, the temperature of the discharged waste gas is still very high. The high-temperature waste gas contains a large amount of energy, and the energy contained in the waste gas mainly comes from the heat source of the drying system itself. After a large amount of energy is discharged, the drying system itself needs to generate energy to replenish it. This can easily increase the energy consumption of the entire drying system, resulting in a large amount of energy waste.

[0005] In summary, the existing waste gas treatment systems still have technical problems, such as the high temperature of the waste gas after discharge in the first and second drying zones, the high energy content of the discharged waste gas, which can easily increase the energy consumption of the entire drying system and thus cause significant energy waste. Summary of the Invention

[0006] The purpose of this invention is to provide a waste gas treatment system for a gypsum board dryer, in order to solve the technical problem that the waste gas emitted from the first and second drying zones in the existing waste gas treatment systems has a high temperature and contains a high amount of energy, which easily increases the energy consumption of the entire drying system and causes a large amount of energy waste.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0008] A gypsum board dryer exhaust gas treatment system includes a first drying zone, a second drying zone and a third drying zone, wherein a first exhaust gas treatment pipe, a second exhaust gas treatment pipe and a third exhaust gas treatment pipe for conveying exhaust gas are respectively connected to the first drying zone, the second drying zone and the third drying zone.

[0009] The exhaust gases discharged from the first exhaust gas treatment pipe and the second exhaust gas treatment pipe can be independently input into the third drying area and discharged through the exhaust end of the third exhaust gas treatment pipe, so as to use the high temperature exhaust gases in the first exhaust gas treatment pipe and the second exhaust gas treatment pipe to achieve heat exchange with the gas used for drying gypsum board in the third drying area.

[0010] The exhaust end of the third waste gas treatment pipeline is connected to a heat exchange device. Under the heat exchange action of the heat exchange device, the heat of the waste gas in the third waste gas treatment pipeline is absorbed, and the absorbed heat is reintroduced into the first drying zone, the second drying zone, and the third drying zone.

[0011] In a preferred embodiment of the present invention, the first waste gas treatment pipe, the second waste gas treatment pipe, and the third drying area are connected by a gas transmission pipe. The gas transmission pipe includes a main pipe and two auxiliary pipes. One end of the gas transmission pipe is connected to the third drying area, and the other end of the gas transmission pipe is connected to the two auxiliary pipes respectively. The two auxiliary pipes are respectively connected to the first waste gas treatment pipe and the second waste gas treatment pipe.

[0012] As a preferred embodiment of the present invention, exhaust gas butterfly valves are installed on the first exhaust gas treatment pipeline, the second exhaust gas treatment pipeline, the main pipeline and the third exhaust gas treatment pipeline to control the exhaust status in each pipeline.

[0013] As a preferred embodiment of the present invention, one end of the main pipe extending into the cavity of the third drying area is connected to a uniform air distribution panel to evenly introduce the exhaust gas from the first exhaust gas treatment pipe and the second exhaust gas treatment pipe into the main pipe into the third drying area.

[0014] As a preferred embodiment of the present invention, both the main pipeline and the third waste gas treatment pipeline are equipped with waste gas fans. The waste gas fan on the main pipeline can guide the waste gas in the first waste gas treatment pipeline and the second waste gas treatment pipeline into the third drying area, and the waste gas fan on the third waste gas treatment pipeline can guide the waste gas in the third drying area into the heat exchange device for heat exchange.

[0015] As a preferred embodiment of the present invention, a dehumidification device is connected to the main pipeline, and the air outlet of the dehumidification device is connected to the air inlet of the exhaust gas fan, so that the dry gas dehumidified by the dehumidification device is drawn in by the exhaust gas fan.

[0016] As a preferred embodiment of the present invention, a combustion device and a combustion-supporting fan are provided in the first drying zone, the second drying zone, and the third drying zone. The combustion-supporting fan introduces gas into the combustion device through a pipe. The combustion-supporting fan is connected to the heat exchange device through a pipe so as to introduce the high-temperature gas after heat exchange through the third waste gas treatment pipe into the combustion device.

[0017] As a preferred embodiment of the present invention, one end of the heat exchange device is connected to a circulation pipe, and the outlet of the other end of the heat exchange device is connected to an exhaust gas chimney through a pipe. The circulation pipe includes a main pipe and several branch pipes, and the main pipe is connected to each of the combustion fans through one of the branch pipes.

[0018] The main pipe is also connected to a branch pipe at the inlet of the first drying area, so that the heat absorbed by the heat exchange device can be reintroduced into the first drying area through the branch pipe.

[0019] As a preferred embodiment of the present invention, each of the branch pipes connecting the combustion fan to the main pipe is provided with a circulating butterfly valve to independently control the air intake in each branch pipe.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] In this waste gas treatment system, the waste gas from the first and second drying zones does not directly exchange heat before being discharged. Instead, it is introduced into the third drying zone to perform work, and then uniformly enters the heat exchanger from all three zones for heat exchange before being discharged. This reduces the primary heat source supply to the third drying zone. The heat exchange achieved through work also greatly reduces the temperature of the flue gas discharged from the first and second drying zones, maximizing the utilization of the energy in the waste gas from the first and second drying zones. This reduces the energy consumption of the drying system itself and saves resources.

[0022] Meanwhile, the exhaust gas passing through the third drying zone can also be recirculated back to the first, second, and third drying zones through heat exchange, thereby raising the temperature of the heating source in these three zones, further reducing the energy consumption of the entire drying system and saving resources. Attached Figure Description

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall system structure provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the three drying zones provided by the present invention;

[0026] The labels in the diagram represent the following:

[0027] 1. First drying zone; 2. Second drying zone; 3. Third drying zone; 4. First waste gas treatment pipeline; 5. Second waste gas treatment pipeline; 6. Third waste gas treatment pipeline; 7. Heat exchanger; 8. Gas transmission pipeline; 81. Main pipeline; 82. Auxiliary pipeline; 9. Circulation pipeline; 91. Main pipe; 92. Branch pipe; 10. Waste gas butterfly valve; 11. Waste gas fan; 12. Air distribution panel; 13. Dehumidification device; 14. Combustion device; 15. Combustion fan; 16. Waste gas chimney; 17. Circulation butterfly valve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1-2 As shown, where Figure 1 The arrows in the diagram indicate the direction of gas flow. Figure 2 The arrows in the diagram indicate the direction of travel of the gypsum board. A gypsum board dryer exhaust gas treatment system includes a first drying zone 1, a second drying zone 2, and a third drying zone 3. The first drying zone 1, the second drying zone 2, and the third drying zone 3 are respectively connected to a first exhaust gas treatment pipe 4, a second exhaust gas treatment pipe 5, and a third exhaust gas treatment pipe 6 for conveying exhaust gas to the outside.

[0030] The exhaust gases discharged from the first exhaust gas treatment pipe 4 and the second exhaust gas treatment pipe 5 can be independently input into the third drying zone 3 and discharged through the exhaust end of the third exhaust gas treatment pipe 6, so as to use the high temperature exhaust gases in the first exhaust gas treatment pipe 4 and the second exhaust gas treatment pipe 5 to achieve heat exchange with the gas used for drying gypsum board in the third drying zone 3.

[0031] The exhaust end of the third waste gas treatment pipe 6 is connected to a heat exchange device 7. Under the heat exchange action of the heat exchange device 7, the heat of the waste gas in the third waste gas treatment pipe 6 is absorbed, and the absorbed heat is reintroduced into the first drying zone 1, the second drying zone 2 and the third drying zone 3.

[0032] Since the temperature of the heated and dried gypsum board in the first drying zone 1 and the second drying zone 2 is generally higher than that in the third drying zone 3, when the first exhaust gas treatment pipe 4 and the second exhaust gas treatment pipe 5 are introduced into the third drying zone 3, the exhaust gas with a higher temperature in the first drying zone 1 and the second drying zone 2 exchanges heat with the exhaust gas with a lower temperature in the third drying zone 3. The temperature of the exhaust gas is used to increase the heat generated by the heat source in the third drying zone 3. This not only reduces the heating of the third drying zone 3 itself and reduces energy consumption, but also indirectly reduces the temperature of the exhaust gas in the first drying zone 1 and the second drying zone 2, which is conducive to reducing the temperature of the final exhaust gas emission and reducing the impact on the external environment.

[0033] In this waste gas treatment system, the waste gas temperatures in the first and second drying zones are not directly exchanged for heat before being discharged. Instead, the waste gas is introduced into the third drying zone to perform work, and then enters the heat exchanger from all three zones for heat exchange before being discharged. This reduces the primary heat source supply to the third drying zone, and the heat exchange achieved through work also greatly reduces the temperature of the flue gas discharged from the first and second drying zones.

[0034] Meanwhile, the exhaust gas passing through the third drying zone can also be recirculated back to the first, second, and third drying zones through heat exchange, thereby raising the temperature of the heating source in these three zones, thus reducing the energy consumption of the entire drying system and saving resources.

[0035] Since the exhaust gas treatment in the first, second, and third drying zones is carried out independently, in order to ensure the stability of the exhaust gas flow, the exhaust gas needs to flow along a predetermined route.

[0036] Specifically, such as Figure 1As shown, the first waste gas treatment pipe 4, the second waste gas treatment pipe 5 and the third drying area 3 are connected by a gas transmission pipe 8. The gas transmission pipe 8 includes a main pipe 81 and two auxiliary pipes 82. One end of the gas transmission pipe 8 is connected to the third drying area 3, and the other end of the gas transmission pipe 8 is connected to the two auxiliary pipes 82 respectively. The two auxiliary pipes 82 are respectively connected to the first waste gas treatment pipe 4 and the second waste gas treatment pipe 5.

[0037] As the gypsum board is conveyed by the conveying device, it passes through the first drying zone, the second drying zone, and the third drying zone in sequence. After passing through each zone, high humidity gas is generated in each zone under the action of high temperature. The high humidity gas is mainly discharged through various exhaust gas pipes. During the discharge process, the first exhaust gas treatment pipe 4, the second exhaust gas treatment pipe 5, and the third exhaust gas treatment pipe 6 need to ensure that the discharged gas is exhaust gas, not flue gas generated by the heat source. Therefore, a valve to control the flow of exhaust gas in the pipe needs to be installed in each exhaust gas pipe.

[0038] Specifically, such as Figure 1 As shown, exhaust gas butterfly valves 10 are installed on the first exhaust gas treatment pipe 4, the second exhaust gas treatment pipe 5, the main pipe 81, and the third exhaust gas treatment pipe 6 to control the exhaust status in each pipe. When the exhaust gas butterfly valve 10 is open, the exhaust gas can flow along its respective pipe. Conversely, when the exhaust gas butterfly valve 10 is open, the exhaust gas is blocked in the drying area. The opening and closing of the exhaust gas butterfly valve 10 depends on which area the gypsum board is in during the drying process.

[0039] Furthermore, such as Figure 1 As shown, both the main pipe 81 and the third waste gas treatment pipe 6 are equipped with waste gas fans 11. The waste gas fan 11 on the main pipe 81 can guide the waste gas in the first waste gas treatment pipe 4 and the second waste gas treatment pipe 5 into the third drying zone 3. The waste gas fan 11 on the third waste gas treatment pipe 6 can guide the waste gas in the third drying zone 3 into the heat exchange device 7 for heat exchange.

[0040] The exhaust fan 11 has strong suction, which can increase the suction in each exhaust pipe, thereby discharging the exhaust gas from the drying area along the exhaust pipe.

[0041] Since the temperature and flow rate of the exhaust gas in the first exhaust gas treatment pipe 4 and the second exhaust gas treatment pipe 5 are different, the unstable exhaust gas may cause uneven heating of various areas of the gypsum board after flowing into the third drying area 3. Therefore, the exhaust gas in the first exhaust gas treatment pipe 4 and the second exhaust gas treatment pipe 5 needs to be treated before flowing into the third drying area 3 so that the exhaust gas can enter the third drying area 3 stably and evenly.

[0042] Specifically, such as Figure 1As shown, one end of the main pipe 81 that extends into the inner cavity of the third drying zone 3 is connected to a uniform air distribution panel 12, so as to evenly introduce the exhaust gas from the first exhaust gas treatment pipe 4 and the second exhaust gas treatment pipe 5 into the main pipe 81 into the third drying zone 3.

[0043] Because the temperatures in the first drying zone 1 and the second drying zone 2 are relatively high, a significant amount of moisture evaporates from the gypsum board, meaning the exhaust gas contains a high level of moisture. Furthermore, during the drying process in the third drying zone 3, it is necessary to ensure that the moisture content of the gypsum board is controlled within a certain range. The heating and drying in the first drying zone 1 and the second drying zone 2 is primarily aimed at gradually reducing the moisture content. If exhaust gas with a high moisture content is directly introduced into the third drying zone 3, it will increase the drying time in the third drying zone 3 before the moisture can be removed. Therefore, to avoid this phenomenon, it is necessary to minimize the moisture content of the exhaust gas in the first exhaust gas treatment pipe 4.

[0044] Specifically, such as Figure 1 As shown, a dehumidifier 13 is connected to the main pipe 81. The air outlet of the dehumidifier 13 is connected to the air inlet of the exhaust fan 11. The exhaust fan 11 draws in the dry gas after dehumidification by the dehumidifier 13. The dehumidifier 13 is a conventional dehumidifier, which will not reduce the temperature of the dried gas after removing the moisture from the exhaust gas.

[0045] The first drying zone 1, the second drying zone 2, and the third drying zone 3 are mainly heated by heat sources. In order to make more reasonable use of the preheating of the waste gas in the third waste gas treatment pipeline 6, the preheating of the waste gas can be used in the heat source to reduce the energy consumption of the heat source itself.

[0046] Specifically, such as Figure 1 As shown, a combustion device 14 and a combustion-supporting fan 15 are installed in the first drying zone 1, the second drying zone 2, and the third drying zone 3. The combustion-supporting fan 15 introduces gas into the combustion device 14 through a pipe. The combustion-supporting fan 15 is connected to the heat exchange device 7 through a pipe to introduce the high-temperature gas after heat exchange in the heat exchange device 7 through the third waste gas treatment pipe 6 into the combustion device, thereby increasing the temperature of the fuel in the combustion device 14 and reducing the energy consumption of the combustion device 14 itself.

[0047] Furthermore, such as Figure 1 As shown, one end of the heat exchange device 7 is connected to a circulation pipe 9, and the outlet of the other end of the heat exchange device 7 is connected to a waste gas chimney 16 through a pipe. The circulation pipe 9 includes a main pipe 91 and several branch pipes 92. The main pipe 91 is connected to each combustion fan 15 through a branch pipe 92.

[0048] A branch pipe 92 is also connected to the inlet of the main pipe 91 to reintroduce the heat absorbed by the heat exchange device 7 into the first drying zone 1 through the branch pipe 92.

[0049] The preheating in the third exhaust gas treatment pipeline 6 is introduced into each combustion blower 15 through the cooperation of the main pipe 91 and each branch pipe 92, thereby increasing the temperature of the fuel in the combustion blower 15.

[0050] Since the operating time of each combustion device 14 is different, the waste heat required by each combustion fan 15 is also different.

[0051] Specifically, such as Figure 1 As shown, each branch pipe 92 connecting the combustion fan 15 and the main pipe 91 is equipped with a circulating butterfly valve 17 to independently control the air intake in each branch pipe 92.

[0052] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A waste gas treatment system for a gypsum board dryer, characterized in that, It includes a first drying area (1), a second drying area (2) and a third drying area (3), and the first drying area (1), the second drying area (2) and the third drying area (3) are respectively connected to a first waste gas treatment pipe (4), a second waste gas treatment pipe (5) and a third waste gas treatment pipe (6) for conveying waste gas to the outside. The exhaust gases discharged from the first exhaust gas treatment pipe (4) and the second exhaust gas treatment pipe (5) can be independently input into the third drying area (3) and discharged through the exhaust end of the third exhaust gas treatment pipe (6) so as to use the high temperature exhaust gases in the first exhaust gas treatment pipe (4) and the second exhaust gas treatment pipe (5) to achieve heat exchange with the gas used for drying gypsum board in the third drying area (3). The exhaust end of the third waste gas treatment pipe (6) is connected to a heat exchange device (7). Under the heat exchange action of the heat exchange device (7), the heat of the waste gas in the third waste gas treatment pipe (6) is absorbed, and the absorbed heat is reintroduced into the first drying zone (1), the second drying zone (2) and the third drying zone (3). The first waste gas treatment pipe (4), the second waste gas treatment pipe (5) and the third drying area (3) are connected by a gas transmission pipe (8). The gas transmission pipe (8) includes a main pipe (81) and two auxiliary pipes (82). One end of the main pipe (81) is connected to the third drying area (3), and the other end of the main pipe (81) is connected to the two auxiliary pipes (82). The two auxiliary pipes (82) are respectively connected to the first waste gas treatment pipe (4) and the second waste gas treatment pipe (5). One end of the main pipe (81) that extends into the inner cavity of the third drying area (3) is connected to a uniform air distribution panel (12) so as to uniformly introduce the waste gas from the first waste gas treatment pipe (4) and the second waste gas treatment pipe (5) into the main pipe (81) into the third drying area (3). Combustion devices (14) and combustion fans (15) are provided in the first drying zone (1), the second drying zone (2) and the third drying zone (3). The combustion fans (15) introduce gas into the combustion devices (14) through pipes. The combustion fans (15) are connected to the heat exchange devices (7) through pipes so as to introduce the high-temperature gas in the heat exchange devices (7) after heat exchange through the third waste gas treatment pipe (6) into the combustion devices (14). One end of the heat exchange device (7) is connected to a circulation pipe (9), and the outlet of the other end of the heat exchange device (7) is connected to a waste gas chimney (16) through a pipe. The circulation pipe (9) includes a main pipe (91) and several branch pipes (92). The main pipe (91) and each of the combustion fans (15) are connected through a branch pipe (92). The main pipe (91) is also connected to a branch pipe (92) at the inlet of the first drying zone (1) so that the heat absorbed by the heat exchange device (7) can be reintroduced into the first drying zone (1) through the branch pipe (92).

2. The gypsum board dryer exhaust gas treatment system according to claim 1, characterized in that, Waste gas butterfly valves (10) are installed on the first waste gas treatment pipe (4), the second waste gas treatment pipe (5), the main pipe (81) and the third waste gas treatment pipe (6) to control the exhaust status in each pipe.

3. The gypsum board dryer exhaust gas treatment system according to claim 1, characterized in that, Both the main pipe (81) and the third waste gas treatment pipe (6) are equipped with waste gas fans (11). The waste gas fan (11) on the main pipe (81) can introduce the waste gas in the first waste gas treatment pipe (4) and the second waste gas treatment pipe (5) into the third drying area (3). The waste gas fan (11) on the third waste gas treatment pipe (6) can introduce the waste gas in the third drying area (3) into the heat exchange device (7) for heat exchange.

4. The gypsum board dryer exhaust gas treatment system according to claim 3, characterized in that, A dehumidification device (13) is connected to the main pipe (81). The air outlet of the dehumidification device (13) is connected to the air inlet of the exhaust fan (11). The exhaust fan (11) draws in the dry gas dehumidified by the dehumidification device (13).

5. The gypsum board dryer exhaust gas treatment system according to claim 1, characterized in that, Each of the branch pipes (92) connecting the combustion blower (15) and the main pipe (91) is equipped with a circulating butterfly valve (17) to independently control the air intake in each branch pipe (92).

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