Energy-saving anti-condensation system for drying machine inlet in gypsum board production process

Abstract

The application discloses a kind of gypsum board production process in drying machine entrance energy-saving anti-condensation system, including preheating area, first drying area, second drying area, third drying area and waste gas treatment system, waste gas in first drying area, second drying area and third drying area is treated by heat exchange of waste gas treatment system can be reintroduced into preheating area, preheating air pipe is connected between waste gas treatment system and preheating area, the air outlet of preheating air pipe is opposite the entrance of preheating area, heating device that can heat hot air in preheating air pipe is provided on preheating air pipe, the setting of this system is heated to preheating air, it is favorable to improve the temperature of preheating air, the preheating air of high temperature can improve the board temperature of gypsum board material itself, the temperature of relatively high gypsum board can reduce the possibility of condensation at drying area entrance on one hand, on the other hand, the moisture content of air in drying machine interior can be higher, to reduce flue gas discharge amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-condensation systems, in particular to an energy-saving anti-condensation system for the inlet of a drying machine in a gypsum board production process. BACKGROUND

[0002] In the gypsum board production process, the drying machine mainly functions to dry the moisture present in the gypsum board. Therefore, the air inside the drying machine has a high moisture content. However, since the inside of the drying machine is in a high-temperature state, condensation does not occur inside the drying machine. However, since the temperature of the board entering the drying machine is low, condensation easily occurs at the inlet of the drying machine, resulting in water marks on the board surface and material sticking to the inlet roller.

[0003] The commonly used technical means at present is to exchange heat with the flue gas discharged from the first and second zones of the drying machine. The hot air after heat exchange is introduced into the preheating section of the drying machine inlet. Since the temperature of the preheated air after heat exchange is generally low, although it can increase the temperature of the board entering the drying zone, effectively reducing the possibility of condensation at the inlet of the drying machine, when the temperature of the external environment is low in winter, the loss of the preheated air with low temperature during transmission will further increase, which will cause the temperature of the preheated air to further decrease. The preheated air with lower temperature not only cannot effectively prevent condensation at the inlet of the drying machine, but also cannot further evaporate the water vapor of the gypsum board itself, thereby increasing the exhaust gas emission in the later stage of the entire drying system. SUMMARY

[0004] The purpose of the present application is to provide an energy-saving anti-condensation system for the inlet of a drying machine in a gypsum board production process, to solve the technical problem that the existing anti-condensation system in winter when the temperature of the external environment is low, the loss of the preheated air with low temperature during transmission will further increase, which will cause the temperature of the preheated air to further decrease. The preheated air with lower temperature not only cannot effectively prevent condensation at the inlet of the drying machine, but also cannot further evaporate the water vapor of the gypsum board itself, thereby increasing the exhaust gas emission in the later stage of the entire drying system.

[0005] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0006] An energy-saving anti-condensation system for the inlet of a drying machine in a gypsum board production process, comprising a preheating area, a first drying area, a second drying area, a third drying area, and a waste gas treatment system. The waste gas in the first drying area, the second drying area, and the third drying area is subjected to heat exchange treatment by the waste gas treatment system and can be reintroduced into the preheating area.

[0007] The preheating air pipe is connected between the exhaust treatment system and the preheating area, and an outlet of the preheating air pipe is opposite to an inlet of the preheating area; a temperature increasing device is arranged on the preheating air pipe to heat hot air in the preheating air pipe, so that the temperature of the wet gypsum board before entering the first drying area is increased.

[0008] As a preferred scheme of the present application, the exhaust treatment system comprises several exhaust pipes, and each of the first drying area, the second drying area and the third drying area is externally connected with an exhaust pipe; the exhaust pipes in the first drying area and the second drying area can guide exhaust gas into the third drying area and then discharge the exhaust gas through the exhaust pipe in the third drying area.

[0009] An exhaust end of the exhaust pipe in the third drying area is connected with a heat exchange device, and preheating air in the exhaust gas is guided into the preheating area through the preheating air pipe under the heat exchange of the heat exchange device.

[0010] As a preferred scheme of the present application, the temperature increasing device can increase the temperature of the preheating air in the preheating air pipe by 50-60℃.

[0011] As a preferred scheme of the present application, the preheating air pipe comprises an inner pipe and an outer pipe, and a cavity is formed between the inner pipe and the outer pipe.

[0012] Two ends of the preheating air pipe are respectively connected with a first air guide pipe and a second air guide pipe; the first air guide pipe and the second air guide pipe are both in communication with the cavity; the first air guide pipe is in communication with the exhaust pipes in the first drying area and the second drying area; and the second air guide pipe is in communication with the third drying area.

[0013] As a preferred scheme of the present application, the first air guide pipe is arranged at one end of the preheating air pipe close to the temperature increasing device, and the second air guide pipe is arranged at one end of the preheating air pipe close to the heat exchange device.

[0014] As a preferred scheme of the present application, the first air guide pipe comprises a main pipe and a branch pipe; one end of the main pipe is in communication with the outer pipe; the other end of the main pipe is in communication with the branch pipe; and the branch pipe is in communication with the exhaust pipes in the first drying area and the second drying area.

[0015] As a preferred scheme of the present application, one end of the second pipe extending into the cavity of the third drying area is connected with an air uniformizing panel, so that the exhaust gas in the first drying area and the second drying area is uniformly guided into the third drying area.

[0016] As a preferred scheme of the present application, the waste gas control valve is arranged on the waste gas pipeline in the first drying area, the second drying area and the third drying area to control the flow of waste gas in each waste gas pipeline.

[0017] As a preferred scheme of the present application, the preheating area has an extended closed section, and the length of the closed section of the preheating area is greater than 4 meters; optionally 6 meters.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The system heats the preheated air through the arrangement of the temperature raising device, which is conducive to improving the temperature of the preheated air. The high-temperature preheated air can improve the board temperature of the gypsum board. The gypsum board with high temperature can reduce the possibility of condensation at the entrance of the drying area, and also make the air in the drying machine have higher humidity, thereby reducing the amount of flue gas exhaust. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0021] Fig. 1 The system provided by the present application is shown in the overall structure diagram;

[0022] Fig. 2 The structure diagram of the three drying areas, the waste gas treatment system and the preheated air pipeline provided by the present application is shown after being separated;

[0023] The numbers in the drawings represent the following:

[0024] 1, preheating area; 2, first drying area; 3, second drying area; 4, third drying area; 5, waste gas treatment system; 51, waste gas pipeline; 52, heat exchange device; 6, preheated air pipeline; 61, inner tube; 62, outer tube; 63, cavity; 7, temperature raising device; 8, first air guide pipe; 81, main channel; 82, branch channel; 9, second air guide pipe; 10, air distribution panel; 11, waste gas control valve. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figs. 1-2 As shown, an energy-saving and anti-condensation system for the dryer inlet in the gypsum board production process includes a preheating zone 1, a first drying zone 2, a second drying zone 3, a third drying zone 4, and an exhaust gas treatment system 5. The exhaust gas in the first drying zone 2, the second drying zone 3, and the third drying zone 4 can be reintroduced into the preheating zone 1 after heat exchange treatment by the exhaust gas treatment system 5.

[0027] A preheating air duct 6 is connected between the exhaust gas treatment system 5 and the preheating zone 1. The outlet of the preheating air duct 6 is directly opposite the entrance of the preheating zone 1. A heating device 7 is installed on the preheating air duct 6 to heat the hot air in the preheating air duct 6, so as to increase the temperature of the wet gypsum board before it enters the first drying zone 2.

[0028] The system heats the preheating air through a heating device, which helps to increase the temperature of the preheating air. The high temperature of the preheating air can increase the temperature of the gypsum board itself. The higher temperature of the gypsum board can reduce the possibility of condensation at the entrance of the drying area, and also make the humidity of the air inside the dryer higher, thereby reducing the amount of flue gas discharged.

[0029] The reduction in exhaust gas volume is due to the fact that the higher the temperature of the gypsum board itself, the more water vapor it evaporates, and the higher the saturation humidity of the water vapor. Given a fixed amount of gypsum board entering the dryer, the amount of moisture discharged is also fixed. Under the premise of the same exhaust gas volume, higher absolute humidity results in more discharged water vapor. Since the water vapor produced by the dryer remains constant, a higher temperature allows for a more appropriate reduction in exhaust gas volume while still discharging the same amount of water vapor. Therefore, increasing the temperature of the gypsum board entering the dryer, ensuring its surface does not condense, can reduce the amount of exhaust gas discharged.

[0030] Specifically, such as Fig. 2 As shown, the exhaust gas treatment system 5 includes several exhaust gas pipes 51. Each of the first drying zone 2, the second drying zone 3, and the third drying zone 4 is connected to an external exhaust gas pipe 51. The exhaust gas pipes 51 in the first drying zone 2 and the second drying zone 3 can both introduce exhaust gas into the third drying zone 4 and discharge it externally through the exhaust gas pipes 51 in the third drying zone 4.

[0031] In the third drying zone 4, the exhaust end of the exhaust pipe 51 is connected to a heat exchange device. Under the heat exchange action of the heat exchange device 52, the preheated exhaust gas is introduced into the preheating zone 1 through the preheating air pipe 6.

[0032] By combining the waste heat from the exhaust gas with the heating device 7, the temperature of the preheated air is further increased, and the waste heat in the exhaust gas can be fully utilized.

[0033] Specifically, such as Figs. 1-2 As shown, the preheating zone 1 has an extended enclosed section, the length of which is greater than 4 meters; optionally, it is 6 meters.

[0034] The extended enclosed section of the preheating zone increases the preheating time of the wet board, ensuring that the wet board is fully preheated before entering the first zone of the dryer. This increases the temperature of the wet board entering the first zone of the dryer after passing through the preheating zone, reduces water vapor condensation, and avoids bulges formed on the roller conveyor due to condensation, thereby greatly reducing the formation of pits on the gypsum board surface.

[0035] Specifically, such as Figs. 1-2 As shown, the heating device 7 can increase the temperature of the preheated air in the preheated air duct 6 by 50-60°C, for example, by 50°C. Under normal circumstances, the temperature of the preheated air after heat exchange is about 70°C. After being heated by the heating device, the temperature can reach about 120°C, which greatly increases the temperature of the gypsum board.

[0036] Since the preheated air may be damaged by heat when it is transported in the preheated air duct 6, the lost heat needs to be compensated by the heating device 7, which increases the energy consumption of the heating device 7.

[0037] Specifically, such as Fig. 2 As shown, the preheating air duct 6 includes an inner pipe 61 and an outer pipe 62, with a cavity 63 formed between the inner pipe 61 and the outer pipe 62;

[0038] The two ends of the preheating air duct 6 are respectively connected to the first air guide pipe 8 and the second air guide pipe 9. Both the first air guide pipe 8 and the second air guide pipe 9 are connected to the cavity 63. The first air guide pipe 8 is connected to the exhaust gas duct 51 in the first drying area 2 and the second drying area 3, and the second air guide pipe 9 is connected to the third drying area 4.

[0039] The exhaust gas temperature in the exhaust gas pipes 51 in the first drying zone 2 and the second drying zone 3 can reach 120-130℃. The exhaust gas in the exhaust gas pipes 51 of the two drying zones is introduced into the preheating air pipe 6. The temperature of the exhaust gas can be used to heat the preheating air and increase the temperature of the cavity 63, which can achieve a good heat preservation effect. On the one hand, it reduces the heat loss of the preheating air transported in the preheating air pipe 6, and on the other hand, it can also perform preliminary heating of the preheating air, thereby reducing the energy consumption of the heating device 7.

[0040] Further, as shown in Fig. 2 the first air guide pipe 8 is arranged on the end of the preheating air pipe 6 close to the temperature raising device 7, and the second air guide pipe 9 is arranged on the end of the preheating air pipe 6 close to the heat exchange device 52.

[0041] In the first drying area 2 and the second drying area 3, the exhaust gas in the exhaust gas pipe 51 flows from the first air guide pipe 8 and then from the second air guide pipe, and the preheating air in the preheating air pipe 6 flows from the temperature raising device 7 to the heat exchange device 52, while the preheating air in the preheating air pipe 6 flows from the heat exchange device 52 to the temperature raising device 7, that is, the flow direction of the exhaust gas is opposite to that of the preheating air, so as to prolong the heating time of the preheating air and improve the heating effect of the preheating air.

[0042] Since the preheating air pipe 6 is usually a metal pipe, it has good heat transfer effect, so that good heat exchange can be achieved.

[0043] Specifically, as shown in Fig. 2 the first air guide pipe 8 includes a main pipe 81 and a branch pipe 82, one end of the main pipe 81 is communicated with the outer pipe 62, the other end of the main pipe 81 is communicated with the branch pipe 82, the branch pipe 82 is communicated with the exhaust gas pipe 51 in the first drying area 2 and the second drying area 3, and the arrangement of the main pipe 81 and the branch pipe is conducive to the mixing of the exhaust gas in the exhaust gas pipe 51 in the first drying area 2 and the second drying area 3 in the branch pipe 82, so as to realize heat exchange and ensure constant temperature, and the constant temperature entering the main pipe 81 and the cavity 63 is conducive to the uniform heating of the preheating air.

[0044] In each pipe, the gas flow is mainly guided by a suction fan or the like, and the preheating air pipe 6 includes an inner pipe 61 and an outer pipe 62, and a cavity 63 is formed between the inner pipe 61 and the outer pipe 62 to control the gas flow in each pipe.

[0045] In order to ensure the stability of the exhaust gas input into the third drying area 4.

[0046] Specifically, as shown in Fig. 2 the end of the second pipe extending into the inner cavity of the third drying area 4 is connected with an air uniformizing panel 10, so as to uniformly guide the exhaust gas in the first drying area 2 and the second drying area 3 into the third drying area.

[0047] The above embodiments are only exemplary embodiments of the present application, and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the present application.

Claims

1. A system for energy saving and anti-condensation at the inlet of a dryer in a gypsum board production process, characterized by: It comprises a preheating area (1), a first drying area (2), a second drying area (3), a third drying area (4) and a waste gas treatment system (5), the waste heat of the waste gas in the first drying area (2), the second drying area (3) and the third drying area (4) can be introduced into the preheating area (1) through the heat exchange treatment of the waste gas treatment system (5); A preheating air pipe (6) is connected between the waste gas treatment system (5) and the preheating area (1), the outlet of the preheating air pipe (6) is opposite to the inlet of the preheating area (1), a temperature raising device (7) is arranged on the preheating air pipe (6) to heat the hot air in the preheating air pipe (6) and raise the temperature of the wet gypsum board before entering the first drying area (2). The waste gas treatment system (5) comprises several waste gas pipes (51), one waste gas pipe (51) is connected to the first drying area (2), the second drying area (3) and the third drying area (4) respectively, the waste gas pipes (51) in the first drying area (2) and the second drying area (3) can introduce the waste gas into the third drying area (4) and discharge the waste gas through the waste gas pipe (51) in the third drying area (4). The exhaust end of the waste gas pipe (51) in the third drying area (4) is connected with a heat exchange device (52), the waste heat in the waste gas is introduced into the preheating area (1) through the preheating air pipe (6) under the heat exchange of the heat exchange device (52). The preheating air pipe (6) comprises an inner pipe (61) and an outer pipe (62), a cavity (63) is formed between the inner pipe (61) and the outer pipe (62). The preheating air pipe (6) is connected with a first air guide pipe (8) and a second air guide pipe (9) at two ends respectively, the first air guide pipe (8) and the second air guide pipe (9) are connected with the cavity (63), the first air guide pipe (8) is connected with the waste gas pipes (51) in the first drying area (2) and the second drying area (3), the second air guide pipe (9) is connected with the third drying area (4). The first air guide pipe (8) comprises a main pipe (81) and a branch pipe (82), one end of the main pipe (81) is connected with the outer pipe (62), the other end of the main pipe (81) is connected with the branch pipe (82), the branch pipe (82) is connected with the waste gas pipes (51) in the first drying area (2) and the second drying area (3). The second air guide pipe (9) is connected with an air uniformizing panel (10) at the end which extends into the inner cavity of the third drying area (4), so that the waste gas in the first drying area (2) and the second drying area (3) can be introduced into the third drying area uniformly.

2. A system for preventing condensation at the inlet of a dryer in a gypsum board production process according to claim 1, characterized in that, The temperature raising device (7) can raise the temperature of the preheating air in the preheating air pipe (6) by 50-60℃.

3. A system for preventing condensation at the inlet of a dryer in a gypsum board production process according to claim 2, characterized in that, The first air guide pipe (8) is arranged on the end of the preheating air pipe (6) which is close to the temperature raising device (7), the second air guide pipe (9) is arranged on the end of the preheating air pipe (6) which is close to the heat exchange device (52).

4. A dehumidifier inlet energy saving anti-condensation system in a gypsum board production process according to claim 1, characterized in that, The waste gas control valve (11) is arranged on the waste gas pipeline (51) in the first drying area (2), the second drying area (3) and the third drying area (4) to control the flow of waste gas in each waste gas pipeline (51).

5. A dehumidifier inlet energy saving anti-condensation system in a gypsum board production process according to claim 1, characterized in that, The preheating area (1) has an extended closed section, and the length of the closed section of the preheating area (1) is greater than 4 meters.

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