Air chute hot air waste heat recovery system and control method

Abstract

The invention discloses an air chute hot air waste heat recovery system and a control method. The air chute hot air waste heat recovery system comprises a feeding chute, a recovery air duct, a circulating pipeline, a pressure sensor and a flashboard. The feeding chute is used for conveying gypsum clinker and is provided with a chute fan; the recovery air duct is arranged above the chute fan and is used for recovering and filtering waste heat air in the feeding chute; the circulating pipeline is communicated with the recovery air duct and the chute fan, and the circulating pipeline can convey the filtered waste heat air into the chute fan; the pressure sensor can detect the pressure change in the feeding chute and feed back a signal so as to control the flashboard to adjust the air inlet amount of the chute fan. Waste heat air exhausted from the feeding chute is recycled and filtered through the recycling air duct, the waste heat air is conveyed to the chute fan through the circulating pipeline to be circularly conveyed, and meanwhile a pressure change signal in the feeding chute is detected and fed back through the pressure sensor so as to control the flashboard to adjust the air inlet amount of the chute fan. And therefore, stable conveying of the gypsum clinker in the feeding chute is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery in a gypsum board production line, and particularly to an air chute hot air waste heat recovery system and a control method. Background Art

[0002] During the production of gypsum boards, the transportation of clinker mainly occurs after the clinker preparation stage, that is, the calcined gypsum enters the storage or processing link. Specifically, the calcined gypsum is cooled and stored, and then it is sent to the subsequent processes for further processing or use through a conveying system. In order to improve the conveying efficiency of clinker and reduce the diffusion of dust, an air chute is often used to convey gypsum clinker.

[0003] Currently, a fan is often used to blow air into the air chute, and a stable negative pressure is formed in the air chute in cooperation with an exhaust pipe to convey gypsum clinker. When the air is blown into the lower chute by the fan and passes through the breathable layer, the material is fluidized, and the fluidized material flows downward along the chute under the action of its own gravity to be discharged from the discharge port. The existing method of using an air chute to convey clinker can achieve efficient conveying of gypsum clinker. The temperature of the gypsum clinker when it enters the air chute is often between 80 and 120 °C, while the outdoor temperature during winter production is often between 0 and -20 °C. When cold air enters the chute and mixes with the gypsum powder, condensation is likely to occur, resulting in the caking of the breathable cloth, a decrease in the conveying capacity, and equipment failures such as material blockage, thereby affecting the stability of clinker conveying during winter production.

[0004] Therefore, the existing method of using an air chute to convey gypsum clinker has the problem that during winter production, when the fan blows cold air into the air chute and mixes it with the clinker, condensation occurs, resulting in the caking of the breathable cloth and material blockage and other equipment failures, thereby affecting the stability of clinker conveying during winter production. Summary of the Invention

[0005] The purpose of the present invention is to provide an air chute hot air waste heat recovery system and a control method to solve the technical problem in the existing technology that during winter production, when the fan blows cold air into the air chute and mixes it with the clinker, condensation occurs, resulting in the caking of the breathable cloth, material blockage and other equipment failures, thereby affecting the stability of clinker conveying during winter production.

[0006] To solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] An air chute hot air waste heat recovery system and a control method, including a feeding chute for conveying gypsum clinker, and a plurality of chute fans are arranged at the lower end of the feeding chute, and the chute fans are used to send air into the feeding chute;

[0008] A recovery air duct, which is connected above the feeding chute, and is used for filtering and recovering the waste heat air discharged from the feeding chute;

[0009] A circulating pipeline, the air inlet of which is connected to the recovery air duct, the air outlet of which is communicated with the air inlet of the chute fan, and a dust collection chimney is arranged on one side of the air outlet of the circulating pipeline, and the dust collection chimney can discharge the excess waste heat air;

[0010] Wherein, a pressure sensor is arranged in the feeding chute, a gate is arranged inside the dust collection chimney of the feeding chute, the pressure sensor is electrically connected to the gate, and the pressure sensor can feedback a change signal to control the gate to open the gate opening to discharge the excess waste heat air when the negative pressure in the feeding chute is too low, or feedback a change signal to control the gate to close the gate opening to increase the air output of the chute fan when the negative pressure in the feeding chute is too high;

[0011] Wherein, the recovery air duct filters and recovers the waste heat air in the feeding chute, conveys the filtered waste heat air into the circulating pipeline, conveys the waste heat air to the air inlet of the chute fan through the circulating pipeline, and simultaneously monitors the pressure in the feeding chute through the pressure sensor and feedbacks a signal to control the gate to adjust the size of the gate opening, so as to realize the stable circulating conveyance of the waste heat air in the feeding chute.

[0012] As a preferred scheme of the present invention, a storage bin and an air inlet bin are arranged in the feeding chute, the storage bin is arranged above the air inlet bin, and a breathable layer is arranged between the storage bin and the air inlet bin;

[0013] Wherein, a plurality of exhaust ports are arranged on the upper side of the storage bin, and the chute fan is arranged on the lower side of the air inlet bin.

[0014] As a preferred scheme of the present invention, a plurality of the exhaust ports are evenly arranged at the upper end of the storage bin, the upper ports of the exhaust ports are communicated to form a recovery pipeline, the recovery pipeline is connected to the air inlet of the recovery air duct, the air inlets of a plurality of the chute fans are communicated to form an air inlet pipeline, and the air inlet pipeline is arranged parallel to the feeding chute;

[0015] Wherein, the pressure sensor is arranged on the side wall of the storage bin, and the pressure sensor is located between two of the exhaust ports to avoid being affected by the exhaust air flow.

[0016] As a preferred embodiment of the present invention, a dust removal cloth bag is provided inside the recovery air duct, a dust hopper is provided at the lower end of the recovery air duct, the air inlet of the recovery air duct is provided at the lower end of one side of the recovery air duct, and the air outlet of the recovery air duct is provided at the upper end of the other side of the recovery air duct;

[0017] Wherein, a suction fan is provided inside the air inlet of the recovery air duct, and the air suction volume of the suction fan is greater than the air supply volume of the inclined trough fan.

[0018] As a preferred embodiment of the present invention, a heat insulation layer is provided inside the barrel wall of the recovery air duct to prevent condensed water droplets from forming on the inner side of the barrel wall of the recovery air duct and causing dust adhesion.

[0019] As a preferred embodiment of the present invention, the circulation pipeline is in a rectangular loop shape, a blower is provided on the circulation pipeline, the air inlet of the circulation pipeline is connected to the air outlet of the recovery air duct, and the air outlet of the circulation pipeline is connected to the air inlet pipeline and the dust collection chimney.

[0020] As a preferred embodiment of the present invention, a Y-shaped shunt pipeline is provided at the air outlet of the circulation pipeline, and the nozzles of the two branches of the shunt pipeline face upward;

[0021] Wherein, the inclined lower end of the air inlet pipeline is connected to one of the branches, and the dust collection chimney is connected to the other branch.

[0022] As a preferred embodiment of the present invention, a hot air duct is provided on one side of the blower, and the hot air duct is used to preheat the gas in the circulation pipeline;

[0023] Wherein, the air inlet of the circulation pipeline is connected to the dust collection chimney, and a switching valve is provided at the connection, and the switching valve can be opened to form a circular passage in the circulation pipeline, or closed to connect the circulation pipeline to the recovery air duct;

[0024] Wherein, a connecting valve is provided in the branch connecting the air inlet pipeline, and the connecting valve can be closed when the switching valve is opened, or opened when the switching valve is closed.

[0025] As a preferred embodiment of the present invention, a spherical valve core is provided inside the switching valve, the spherical valve core has a T-shaped passage, when the spherical valve core is opened, the passage can connect the air inlet of the circulation pipeline and the dust collection chimney and close the air outlet of the recovery air duct, and when the spherical valve core is closed, the passage can connect the circulation pipeline and the recovery air duct and close the dust collection chimney;

[0026] Wherein, the gate plate is provided above the switching valve.

[0027] To solve the above technical problems, the present invention further provides the following technical solutions:

[0028] Step 100: The inclined chute fan blows air into the feeding inclined chute to convey the gypsum clinker, and the waste heat air in the feeding inclined chute enters the recovery air duct upward.

[0029] Step 200: The recovery air duct filters the waste heat air and sends it into the circulation pipeline. The circulation pipeline conveys the waste heat air to the air inlet of the inclined chute fan to circulate and convey the gypsum clinker.

[0030] Step 300: The pressure sensor monitors the air pressure in the feeding inclined chute. When the negative pressure in the feeding inclined chute is too low, the pressure sensor can feedback a change signal to control the gate to open the gate opening. When the negative pressure in the feeding inclined chute is too high, the pressure sensor can feedback a change signal to control the gate to close the gate opening.

[0031] The present invention has the following beneficial effects compared with the prior art:

[0032] The present invention recovers and filters the waste heat air discharged from the feeding inclined chute through the recovery air duct, conveys the waste heat air to the inclined chute fan through the circulation pipeline for circulating conveyance, and at the same time detects and feedbacks the pressure change signal in the feeding inclined chute through the pressure sensor to control the gate to adjust the air intake of the inclined chute fan, thereby realizing the stable conveyance of the gypsum clinker in the feeding inclined chute. Brief Description of the Drawings

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0034] Figure 1 It is a schematic structural diagram of the air inclined chute waste heat recovery system and control method provided by the embodiment of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the feeding inclined chute provided by the embodiment of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the recovery air duct provided by the embodiment of the present invention;

[0037] Figure 4 It is a schematic structural diagram of the circulation pipeline provided by the embodiment of the present invention;

[0038] Figure 5 It is a schematic structural diagram when the switching valve is opened provided by the embodiment of the present invention;

[0039] Figure 6 This is a schematic structural diagram when the switching valve in the embodiment of the present invention is closed.

[0040] The labels in the figure are respectively represented as follows:

[0041] 1 - Feeding chute; 2 - Recovery air duct; 3 - Circulation pipeline; 4 - Pressure sensor; 5 - Gate plate;

[0042] 11 - Chute fan; 12 - Silo; 13 - Intake bin; 14 - Permeable layer; 21 - Dust removal cloth bag; 22 - Hopper; 23 - Exhaust fan; 24 - Thermal insulation layer; 31 - Dust collection chimney; 32 - Blower; 33 - Shunt pipeline; 34 - Switching valve; 35 - Connecting valve;

[0043] 111 - Air inlet pipeline; 121 - Exhaust port; 122 - Recovery pipeline; 331 - Branch; 321 - Hot air duct; 341 - Spherical valve core; 342 - Passage. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] As Figure 1 shown, the present invention provides an air chute hot air waste heat recovery system and control method, including:

[0046] A feeding chute 1 for conveying gypsum clinker, and several chute fans 11 are arranged at the lower end of the feeding chute 1 for blowing air into the feeding chute 1;

[0047] A recovery air duct 2 communicated above the feeding chute 1 for filtering and recovering the waste heat air discharged from the feeding chute 1;

[0048] A circulation pipeline 3, the air inlet of the circulation pipeline 3 is connected to the recovery air duct 2, the air outlet of the circulation pipeline 3 is communicated with the air inlet of the chute fan 11, and a dust collection chimney 31 is arranged on one side of the air outlet of the circulation pipeline 3, and the dust collection chimney 31 can discharge the excess waste heat air;

[0049] Among them, a pressure sensor 4 is arranged in the feeding chute 1, and a gate plate 5 is arranged on the inner side of the dust collection chimney 31 of the feeding chute. The pressure sensor 4 is electrically connected to the gate plate 5. When the negative pressure in the feeding chute 1 is too low, the pressure sensor 4 can feedback a change signal to control the gate plate 5 to open the gate opening to discharge excess waste heat air, or when the negative pressure in the feeding chute 1 is too high, the pressure sensor 4 can feedback a change signal to control the gate plate 5 to close the gate opening to increase the air output of the chute fan 11;

[0050] Among them, the recovery air duct 2 filters and recovers the waste heat air in the feeding chute 1, and conveys the filtered waste heat air into the circulation pipeline 3. The waste heat air is conveyed to the air inlet of the chute fan 11 through the circulation pipeline 3. At the same time, the pressure sensor 4 monitors the pressure in the feeding chute 1 and feedbacks a signal to control the gate plate 5 to adjust the size of the gate opening, so as to realize the stable circulation and conveying of the waste heat air in the feeding chute 1.

[0051] In this embodiment, a recovery air duct 2 is arranged above the feeding chute 1, a circulation pipeline 3 is arranged on one side of the recovery air duct 2, and the air outlet of the circulation pipeline 3 is communicated with the air inlet of the chute fan 11. A pressure sensor 4 is arranged in the feeding chute 1, and a gate plate 5 is arranged in the dust collection chimney 31. The pressure sensor 4 is electrically connected to the gate plate 5. The waste heat air discharged from the feeding chute 1 enters the recovery air duct 2, and the recovery air duct 2 can filter and convey the waste heat air into the circulation pipeline 3, and then convey it to the air inlet of the chute fan 11 through the circulation pipeline 3 for circulation and conveying. At the same time, the pressure sensor 4 can monitor the pressure in the feeding chute 1 and feedback a signal to control the gate plate 5 to adjust the size of the gate opening to maintain the negative pressure in the feeding chute 1, so as to realize the stable circulation and conveying of the waste heat air in the feeding chute.

[0052] Compared with the existing method of blowing air into the air chute to convey gypsum clinker, the present invention filters and recovers the waste heat air in the feeding chute 1 through the recovery air duct 2, circulates and conveys the waste heat air to the air inlet of the chute fan 11 through the circulation pipeline 3, and at the same time maintains the negative pressure in the feeding chute 1 through the pressure sensor 4 and the gate plate 5, so as to realize the cyclic recovery and conveying of the waste heat air, and avoid the problem of blockage of the feeding chute 1 caused by air temperature difference during winter production.

[0053] When the feeding chute 1 is conveying, it is necessary to ensure the stable air flow in the feeding chute 1 to ensure the stable conveying of gypsum clinker. Therefore, the following preferred embodiments are proposed.

[0054] As Figure 1 and 2 shown, the feeding chute 1 is provided with a bin 12 and an air inlet bin 13. The bin 12 is arranged above the air inlet bin 13, and a breathable layer 14 is arranged between the bin 12 and the air inlet bin 13;

[0055] Among them, several exhaust ports 121 are arranged on the upper side of the silo 12, and the inclined chute fan 11 is arranged on the lower side of the intake bin 13.

[0056] Several exhaust ports 121 are evenly arranged at the upper end of the silo 12. The upper ports of the exhaust ports 121 are connected to form a recovery pipeline 122. The recovery pipeline 122 is connected to the intake port of the recovery air duct 2. The intake ports of several inclined chute fans 11 are connected to form an intake pipeline 111. The intake pipeline 111 is arranged parallel to the feeding inclined chute 1.

[0057] Among them, the pressure sensor 4 is arranged on the side wall of the silo 12. The pressure sensor 4 is located between two exhaust ports 121 to avoid being affected by the exhaust air flow.

[0058] Specifically, the exhaust ports 121 and the inclined chute fans 11 are evenly arranged on both sides of the feeding inclined chute 1, which can maintain the air flow stability in the feeding inclined chute 1.

[0059] Among them, the pressure sensor 4 is arranged on the side wall between two exhaust ports 121, which can avoid the pressure sensor 4 being affected by the local air flow at the exhaust ports 121, so as to monitor the air pressure in the silo 12.

[0060] In order to realize the recovery and filtration of the waste heat air by the recovery air duct 2, the following preferred embodiments are proposed.

[0061] As Figure 1 and 3 shown, a dust removal cloth bag 21 is arranged inside the recovery air duct 2. A dust hopper 22 is arranged at the lower end of the recovery air duct 2. The intake port of the recovery air duct 2 is arranged at the lower end on one side of the recovery air duct 2. The outlet port of the recovery air duct 2 is arranged at the upper end on the other side of the recovery air duct 2.

[0062] Among them, an exhaust fan 23 is arranged inside the intake port of the recovery air duct 2. The air extraction volume of the exhaust fan 23 is greater than the air supply volume of the inclined chute fan 11.

[0063] Specifically, the exhaust fan 23 can suck the waste heat air into the recovery air duct 2. After the waste heat air enters the recovery air duct 2, it can be filtered through the dust removal cloth bag 21. The filtered dust can fall into the dust hopper 22 for discharge.

[0064] Among them, the air extraction volume of the exhaust fan 23 is greater than the air supply volume of the inclined chute fan 11, which can form a negative pressure in the feeding inclined chute 1 to improve the efficiency and stability of the gypsum clinker transportation.

[0065] Since the temperature is relatively low in winter, there is a large temperature difference between the outer wall and the interior of the recovery air duct 2. Therefore, in order to avoid the appearance of condensate droplets on the inner wall of the recovery air duct 2, resulting in dust adhesion and caking, affecting the dust removal effect, the following preferred embodiments are proposed.

[0066] As shown Figure 3 As shown, a heat preservation layer 24 is provided inside the barrel wall of the recovery air duct 2 to prevent condensation water droplets from forming on the inner side of the barrel wall of the recovery air duct 2 and causing dust adhesion.

[0067] Specifically, the heat preservation layer 24 can prevent the temperature of the inner wall of the recovery air duct 2 from being too low, thereby avoiding condensation and dust adhesion.

[0068] In order to realize the recycling of the waste heat air through the circulation pipeline 3 back to the inclined trough fan 11, the following preferred embodiments are proposed.

[0069] As shown Figure 1 and 4 As shown, the circulation pipeline 3 is in a rectangular loop shape. The circulation pipeline 3 is provided with a blower 32. The air inlet of the circulation pipeline 3 is connected to the air outlet of the recovery air duct 2, and the air outlet of the circulation pipeline 3 is connected to the air inlet pipeline 111 and the dust collection chimney 31.

[0070] Specifically, the blower 32 can transport the waste heat air from the air outlet of the recovery air duct 2 to the air inlet pipeline 111.

[0071] Among them, when the gate plate 5 opens the gate opening, part of the waste heat air can be discharged from the dust collection chimney 31 to adjust the air intake of the inclined trough fan 11.

[0072] In order to improve the waste heat air diversion efficiency of the dust collection chimney 31 and improve the air pressure adjustment rate in the feeding chute 1, the following preferred embodiments are proposed.

[0073] As shown Figure 4 As shown, the air outlet of the circulation pipeline 3 is provided with a Y-shaped diversion pipeline 33, and the nozzles of the two branches 331 of the diversion pipeline 33 face upward;

[0074] Among them, the inclined lower end of the air inlet pipeline 111 is connected to one of the branches 331, and the dust collection chimney 31 is connected to the other branch 331.

[0075] Specifically, the nozzles of the branch 331 facing upward can utilize the buoyancy of the waste heat air to accelerate the diversion, thereby quickly reducing the air intake of the inclined trough fan 11.

[0076] During the start of production in winter, the air temperature in the circulation pipeline 3 is relatively low. When transporting the clinker, the inclined trough fan 11 will directly blow the air in the circulation pipeline 3 into the feeding chute 1. At this time, the relatively low-temperature gas is easily dewetted after being mixed with the first batch of gypsum clinker. Therefore, in order to avoid caking of the first batch of gypsum clinker during startup, the following preferred embodiments are proposed.

[0077] As shown Figures 1 to 6 As shown, a hot air duct 321 is provided on one side of the blower 32, and the hot air duct 321 is used to preheat the gas in the circulation pipeline 3;

[0078] Among them, the air inlet of the circulation pipeline 3 is connected to the dust collection chimney 31, and a switching valve 34 is provided at the connection, and the switching valve 34 can be opened to form an annular passage in the circulation pipeline 3, or closed to connect the circulation pipeline 3 to the recovery air duct 2;

[0079] Among them, a connection valve 35 is provided in the branch 331 connecting the air inlet pipeline 111, and the connection valve 35 can be closed when the switching valve 34 is opened, or opened when the switching valve 34 is closed.

[0080] A spherical valve core 341 is provided inside the switching valve 34. The spherical valve core 341 has a T-shaped passage 342. When the spherical valve core 341 is opened, the passage 342 can connect the air inlet of the circulation pipeline 3 and the dust collection chimney 31 and close the air outlet of the recovery air duct 2. When the spherical valve core 341 is closed, the passage 342 can connect the circulation pipeline 3 and the recovery air duct 2 and close the dust collection chimney 31;

[0081] Among them, the shutter 5 is arranged above the switching valve 34.

[0082] Specifically, when starting work in winter, first open the switching valve 34, and at the same time close the connection valve 35. At this time, the circulation pipeline 3 and the dust collection chimney 31 form a closed loop. Open the blower 32 and the hot air duct 321 to preheat the air in the circulation pipeline. After the preheating is completed, close the switching valve 34 and open the connection valve 35 to connect the circulation pipeline 3 to the air inlet pipeline 111. At this time, the inclined trough fan 11 can blow hot air to convey the first batch of gypsum clinker.

[0083] Among them, the shutter 5 needs to be arranged above the switching valve 34 and closed during startup to ensure that when the switching valve 34 is opened, the circulation pipeline 3 and the dust collection chimney 31 can form a closed loop.

[0084] In addition, since the air can absorb heat after being mixed with the gypsum clinker, it is only necessary to preheat the air in the circulation pipeline 3 to a relatively high temperature to ensure that no condensation occurs between the air and the gypsum clinker, thereby reducing energy consumption.

[0085] Based on the above embodiments, the following provides a control method for an air chute hot air waste heat recovery system, including the following steps:

[0086] Step 100: The inclined trough fan blows air into the feeding inclined trough to convey the gypsum clinker, and the waste heat air in the feeding inclined trough enters the recovery air duct upward;

[0087] Step 200: The recovery air duct filters the waste heat air and sends it into the circulation pipeline. The circulation pipeline conveys the waste heat air to the air inlet of the inclined trough fan to circulate and convey the gypsum clinker;

[0088] Step 300: The pressure sensor monitors the air pressure in the feeding chute. When the negative pressure in the feeding chute is too low, the pressure sensor can feedback a change signal to control the gate to open the gate opening. When the negative pressure in the feeding chute is too high, the pressure sensor can feedback a change signal to control the gate to close the gate opening.

[0089] When this embodiment is working, first, open the conversion valve 34, close the communication valve 35, and turn on the blower 32 and the hot air cylinder 321 to heat the air in the circulation pipeline 3. After heating is completed, close the conversion valve 34, open the communication valve 35, and turn off the hot air cylinder 321;

[0090] Then, the feeding chute 1 starts to feed. Turn on the chute blower 11 to blow the hot air in the circulation pipeline 3 into the feeding chute 1, and at the same time turn on the exhaust fan 23 to suck out the waste heat air in the feeding chute 1 to form a negative pressure in the feeding chute 1 for transportation;

[0091] Then, filter the waste heat air sucked by the exhaust fan 23 through the dust removal cloth bag 21. The filtered dust falls into the ash hopper 22, and the filtered waste heat air enters the circulation pipeline 3 from the air outlet of the recovery air cylinder 2;

[0092] Finally, the blower 32 transports the waste heat air entering the circulation pipeline 3 into the air inlet pipeline 111 so that the waste heat air can be circulated and blown into the feeding chute 1 through the chute blower 11 for circulation transportation. At the same time, detect the pressure in the feeding chute 1 through the pressure sensor 4. When the pressure sensor 4 detects that the negative pressure in the feeding chute 1 is too low, feedback a change signal to control the gate 5 to open the gate opening, discharge the excess waste heat air, and reduce the air volume output of the chute blower 11 to increase the negative pressure in the feeding chute 1. When the pressure sensor 4 detects that the negative pressure in the feeding chute 1 is too high, feedback a change signal to control the gate 5 to close the gate opening, thereby increasing the air volume output of the chute blower 11 to reduce the negative pressure in the feeding chute 1.

[0093] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. An air chute hot air waste heat recovery system and control method, characterized in that Comprising: A feeding chute (1) for conveying gypsum clinker, and a plurality of chute blowers (11) are arranged at the lower end of the feeding chute (1) for blowing air into the feeding chute (1); A recovery air duct (2) connected above the feeding chute (1) for filtering and recovering the waste heat air discharged from the feeding chute (1); A circulation pipeline (3) with its air inlet connected to the recovery air duct (2) and its air outlet communicating with the air inlet of the chute blower (11). A dust collection chimney (31) is arranged on one side of the air outlet of the circulation pipeline (3), and the dust collection chimney (31) can discharge the excess waste heat air; Wherein, a pressure sensor (4) is arranged in the feeding chute (1), and a gate (5) is arranged inside the dust collection chimney (31). The pressure sensor (4) is electrically connected to the gate (5). When the negative pressure in the feeding chute (1) is too low, the pressure sensor (4) can feedback a change signal to control the gate (5) to open the gate opening and discharge the excess waste heat air. Or when the negative pressure in the feeding chute (1) is too high, the pressure sensor (4) can feedback a change signal to control the gate (5) to close the gate opening and increase the air output of the chute blower (11); Wherein, the recovery air duct (2) filters and recovers the waste heat air in the feeding chute (1) and conveys the filtered waste heat air into the circulation pipeline (3). The waste heat air is conveyed to the air inlet of the chute blower (11) through the circulation pipeline (3). At the same time, the pressure sensor (4) monitors the pressure in the feeding chute (1) and feedbacks a signal to control the gate (5) to adjust the gate opening size, thereby realizing the stable circulation and conveying of the waste heat air in the feeding chute (1).

2. The air chute hot air waste heat recovery system and control method according to claim 1, characterized in that The feeding chute (1) has a bin (12) and an air inlet chamber (13). The bin (12) is arranged above the air inlet chamber (13), and a breathable layer (14) is arranged between the bin (12) and the air inlet chamber (13); Wherein, a plurality of exhaust ports (121) are arranged on the upper side of the bin (12), and the chute blower (11) is arranged on the lower side of the air inlet chamber (13).

3. The air chute hot air waste heat recovery system and control method according to claim 2, characterized in that A plurality of the exhaust ports (121) are evenly arranged at the upper end of the bin (12). The upper ports of the exhaust ports (121) communicate to form a recovery pipeline (122), and the recovery pipeline (122) is connected to the air inlet of the recovery air duct (2). The air inlets of a plurality of the chute blowers (11) communicate to form an air inlet pipeline (111), and the air inlet pipeline (111) is arranged parallel to the feeding chute (1); Among them, the pressure sensor (4) is arranged on the side wall of the silo (12), and the pressure sensor (4) is located between two of the exhaust vents (121) to avoid being affected by the exhaust air flow.

4. An air chute hot air waste heat recovery system and control method according to claim 3, characterized in that A dust removal cloth bag (21) is arranged inside the recovery air duct (2), a dust hopper (22) is arranged at the lower end of the recovery air duct (2), the air inlet of the recovery air duct (2) is arranged at the lower end of one side of the recovery air duct (2), and the air outlet of the recovery air duct (2) is arranged at the upper end of the other side of the recovery air duct (2); Among them, a suction fan (23) is arranged inside the air inlet of the recovery air duct (2), and the air extraction volume of the suction fan (23) is greater than the air supply volume of the chute fan (11).

5. An air chute hot air waste heat recovery system and control method according to claim 3, characterized in that A heat preservation layer (24) is arranged inside the barrel wall of the recovery air duct (2) to avoid the generation of condensed water droplets on the inner side of the barrel wall of the recovery air duct (2), resulting in dust adhesion.

6. An air chute hot air waste heat recovery system and control method according to claim 3, characterized in that The circulation pipeline (3) is in a rectangular loop shape, a blower (32) is arranged on the circulation pipeline (3), the air inlet of the circulation pipeline (3) is connected to the air outlet of the recovery air duct (2), and the air outlet of the circulation pipeline (3) is connected to the air inlet pipeline (111) and the dust collection chimney (31).

7. An air chute hot air waste heat recovery system and control method according to claim 4, characterized in that A Y-shaped shunt pipeline (33) is arranged at the air outlet of the circulation pipeline (3), and the nozzles of the two branches (331) of the shunt pipeline (33) face upward; Among them, the inclined lower end of the air inlet pipeline (111) is connected to one of the branches (331), and the dust collection chimney (31) is connected to the other branch (331).

8. An air chute hot air waste heat recovery system and control method according to claim 2, characterized in that A hot air duct (321) is arranged on one side of the blower (32), and the hot air duct (321) is used to preheat the gas in the circulation pipeline (3); Among them, the air inlet of the circulation pipeline (3) is connected to the dust collection chimney (31), and a switching valve (34) is arranged at the connection, and the switching valve (34) can be opened to form a circular path in the circulation pipeline (3), or closed to connect the circulation pipeline (3) to the recovery air duct (2); Among them, a connection valve (35) is arranged in the branch (331) connecting the air inlet pipeline (111), and the connection valve (35) can be closed when the switching valve (34) is opened, or opened when the switching valve (34) is closed.

9. An air chute hot air waste heat recovery system and control method according to claim 2, characterized in that A spherical valve core (341) is arranged inside the switching valve (34). The spherical valve core (341) has a T-shaped passage (342). When the spherical valve core (341) is opened, the passage (342) can connect the air inlet of the circulation pipeline (3) and the dust collection chimney (31) and close the air outlet of the recovery air duct (2). When the spherical valve core (341) is closed, the passage (342) can connect the circulation pipeline (3) and the recovery air duct (2) and close the dust collection chimney (31); Wherein, the sluice gate (5) is arranged above the switching valve (34).

10. An air chute hot air waste heat recovery system and control method according to claim 2, characterized in that: Step 100: The chute fan sends air into the feeding chute to convey gypsum clinker, and the waste heat air in the feeding chute enters the recovery air duct upward; Step 200: The recovery air duct filters the waste heat air and sends it into the circulation pipeline. The circulation pipeline conveys the waste heat air to the air inlet of the chute fan to circulate and convey the gypsum clinker; Step 300: The pressure sensor monitors the air pressure in the feeding chute. When the negative pressure in the feeding chute is too low, the pressure sensor can feedback a change signal to control the sluice gate to open the gate opening. When the negative pressure in the feeding chute is too high, the pressure sensor can feedback a change signal to control the sluice gate to close the gate opening.

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