Flue gas waste heat recovery device for oven machine

Abstract

The utility model provides a flue gas waste heat recovery device for a furnace baking machine, and belongs to the technical field of furnace baking machines. The flue gas waste heat recovery device for the furnace baking machine comprises a furnace end, an air outlet pipe, an air inlet pipe, a furnace body, a heat exchange coil pipe, a water inlet pipe, a water outlet pipe and heat preservation shells, when the flue gas waste heat recovery device is used, the water inlet pipe and the water outlet pipe are screwed off, nuts and threaded rods are disassembled, and then the two heat preservation shells can be taken down; according to the flue gas waste heat recovery device for the oven machine, the weight and the size of the oven machine body are fully reduced through the internal structure of the multiple layers of air channels in an air type cooling mode, and transportation, installation and operation in the using process are facilitated; and through the water inlet pipe, the heat exchange coil pipe and the water outlet pipe, waste heat in flue gas can be conveniently recycled, energy waste is avoided, the heat exchange coil pipe can be conveniently maintained, and better use experience is brought to a user.

Description

Technical Field

[0001] The present application relates to the technical field of drying furnaces, and in particular to a flue gas waste heat recovery device for drying furnaces. Background Art

[0002] At present, in the furnace drying industry, most furnace drying companies use burners purchased on the market as kiln drying machines. That kind of furnace drying method is not furnace drying, but should be called furnace burning. The burner produces an open flame (flame). Since the flame of the open flame furnace directly bakes the surface of the refractory material, the temperature rises sharply, which can easily cause the material to burst; and the negative pressure furnace causes the temperature difference in the furnace to be too large, and the temperature of the parts farther away from the burner is too low, and the furnace drying effect cannot be achieved. The traditional furnace machine uses refractory casting to ensure that the furnace machine shell does not overheat when the flame burns; but the problem is that this type of furnace machine has a large amount of refractory material inside, which makes it heavy and large in size, inconvenient to transport, install and use, and the subsequent maintenance of the castable anti-overheating method is inconvenient and costly.

[0003] After searching, the Chinese patent number is CN202221520230.7, which discloses a hot flue gas air-cooled drying machine, including a columnar furnace body, a burner is provided at one end of the furnace body in the axial direction, an air outlet is provided at the other end of the furnace body, and an air inlet is provided on the radial side of the furnace body near the air outlet; the outer wall of the furnace body includes an outer shell layer, an intermediate layer and a combustion-supporting layer from the outside to the inside, the intermediate layer is provided with an opening near the burner, and the combustion-supporting layer is provided with an opening near the air outlet; the combustion-supporting layer is provided with a plurality of vents, so that air enters the furnace body through the vents. The utility model fully reduces the weight and volume of the drying machine body by adopting a wind-type cooling method through the internal structure of the multi-layer air duct, which facilitates transportation, installation and operation during use; the multi-stage mixing method also reduces the temperature of the hot flue gas, which is conducive to preventing the generation of nitrogen oxides and achieving the purpose of low-nitrogen combustion.

[0004] However, the above scheme still has defects. The burner head is used to supply fuel into the furnace body, and the air inlet pipe is used to supply air into the furnace body. The high-temperature gas after the fuel is burned enters the furnace through the air outlet pipe to achieve the purpose of baking the furnace. However, when the furnace is baked, high-temperature gas will remain in the furnace body. These high-temperature gases will cool down naturally if they are not processed, resulting in a waste of energy and a bad experience for users. Utility Model Content

[0005] In order to make up for the above shortcomings, the present application provides a flue gas waste heat recovery device for a furnace drying machine, which aims to improve the use of the burner head to supply fuel to the furnace body, the air inlet pipe to supply air to the furnace body, and the high-temperature gas after the fuel combustion enters the furnace through the air outlet pipe to achieve the purpose of baking the furnace. However, after the furnace baking is completed, high-temperature gases will remain in the furnace body. These high-temperature gases will cool naturally if they are not processed, resulting in energy waste.

[0006] This application is implemented as follows:

[0007] The present application provides a flue gas waste heat recovery device for a drying furnace, comprising a burner head, an air outlet pipe, an air inlet pipe, a furnace body, a heat exchange coil, a water inlet pipe, a water outlet pipe and a heat-insulating outer shell, wherein the burner head is arranged at one end of the furnace body in the axial direction, the air outlet pipe is arranged at the other end of the furnace body, the air inlet pipe is arranged at a radial side surface of the furnace body close to the air outlet pipe, the outer wall of the furnace body comprises an outer shell, an intermediate layer and a combustion-supporting layer from the outside to the inside, the intermediate layer is arranged at a side close to the burner head with an opening, and the combustion-supporting layer is arranged at a side close to the air outlet pipe with an opening;

[0008] The airflow entering the furnace body through the air inlet pipe flows through the space between the outer shell and the middle layer to one end close to the burner head, flows along the space between the middle layer and the combustion-supporting layer to one end close to the air inlet pipe, and then enters the center of the furnace body to mix with the combustibles entering from the burner head and burn. The heat exchange coil is installed on the air outlet pipe, and the two thermal insulation outer shells are mounted on the air outlet pipe. The two thermal insulation outer shells are fixed together, and the water inlet pipe and the water outlet pipe both pass through the thermal insulation outer shell, and one end of the water inlet pipe and one end of the water outlet pipe are both threaded on the heat exchange coil.

[0009] In one embodiment of the present application, an igniter is disposed on the furnace body near the furnace head.

[0010] In one embodiment of the present application, a plurality of ventilation holes are provided on the combustion-supporting layer, so that air enters the interior of the furnace body through the ventilation holes.

[0011] In one embodiment of the present application, a first thermal insulation sleeve is provided on the water inlet pipe, and a second thermal insulation sleeve is provided on the water outlet pipe.

[0012] In one embodiment of the present application, two heat-insulating outer shells are provided, one of which has two through holes, and the water inlet pipe and the water outlet pipe pass through different through holes.

[0013] In one embodiment of the present application, threaded rods are inserted into the two heat-insulating shells, and nuts are threadedly sleeved on the threaded rods.

[0014] In one embodiment of the present application, the air outlet duct is provided with an exhaust duct connected to the kiln, and the exhaust duct is connected to the furnace body via a flange.

[0015] The beneficial effects of the present application are as follows: the present application obtains a flue gas waste heat recovery device for a drying furnace through the above-mentioned design. When in use, the burner head supplies fuel into the furnace body, the air inlet pipe supplies air into the furnace body, and the high-temperature gas after the fuel is burned enters the furnace through the air outlet pipe to achieve the purpose of drying the furnace. The space between the outer shell and the middle layer forms a cold air duct, and the space between the middle layer and the combustion-supporting layer forms a temperature-regulating air duct. When the fuel is burning inside the furnace body, the airflow of the blower enters the cold air duct from the air inlet pipe on the side of the drying furnace, and is blown from the head along the cold air duct. The cold air enters the temperature-adjusting air duct at the tail end, and the cold air is preheated in the cold air duct, thereby reducing the impact of the high temperature in the furnace body on the outer shell, reducing the impact of the cold air on the hot and cold shock of the combustion area and reducing the fuel consumption. A large amount of wind in the temperature-adjusting air duct blows from the tail to the head, thereby achieving the purpose of secondary heating of the cold air and reducing the fuel consumption. A small amount of wind is discharged from the vents of the combustion-supporting layer and mixed with the flame heat in the combustion area; thereby achieving the temperature control by adjusting the air volume. The temperature-adjusting air duct as a whole is a mixture of a small amount of wind and the flame heat blowing to the drying oven. The head of the furnace body is then mixed with a large amount of wind at high wind pressure to form hot flue gas that is blown out of the furnace body, ultimately achieving the purpose of hot flue gas baking the kiln. When the furnace is baked, water is injected into the water inlet pipe through the water supply equipment, and the water is discharged through the water inlet pipe, heat exchange coil and water outlet pipe. The water takes away the heat in the high-temperature gas in the process of passing through the air outlet pipe, achieving the purpose of recovering the waste heat of the flue gas. When the heat exchange coil needs to be repaired, unscrew the water inlet pipe and the water outlet pipe, and then remove the nut and threaded rod, and the two protective After the insulation shell is removed and the heat exchange coil is repaired, follow the above steps to reinstall the insulation shell, water inlet pipe and water outlet pipe. The flue gas waste heat recovery device for the drying oven adopts wind cooling through the internal structure of the multi-layer air duct to fully reduce the weight and volume of the drying oven body, facilitate transportation, installation and operation during use, and recover the waste heat in the flue gas through the water inlet pipe, heat exchange coil and water outlet pipe to avoid energy waste, and facilitate the repair of the heat exchange coil, giving users a better experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1It is a three-dimensional structural schematic diagram of a flue gas waste heat recovery device for a drying machine provided in an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of the outer shell, the middle layer and the combustion-supporting layer provided in the embodiment of the present application;

[0019] Figure 3 A diagram showing the relationship between the air outlet duct and the heat exchange coil provided in the embodiment of the present application;

[0020] Figure 4 A partial exploded view of a flue gas waste heat recovery device for a drying machine provided in an embodiment of the present application.

[0021] In the figure: 110 - furnace head; 120 - air outlet pipe; 130 - air inlet pipe; 140 - furnace body; 150 - outer shell; 160 - middle layer; 170 - combustion-supporting layer; 180 - igniter; 190 - heat exchange coil; 191 - water inlet pipe; 192 - first insulation sleeve; 193 - water outlet pipe; 194 - second insulation sleeve; 195 - insulation shell; 196 - through hole; 197 - threaded rod; 198 - nut. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] Example

[0024] See also Figure 1 - Figure 4 The present application provides a technical solution: a flue gas waste heat recovery device for a drying furnace, comprising a burner head 110, an air outlet pipe 120, an air inlet pipe 130, a furnace body 140, a heat exchange coil 190, a water inlet pipe 191, a water outlet pipe 193 and a heat insulation shell 195, wherein the burner head 110 is arranged at one end of the furnace body 140 in the axial direction, an igniter 180 is arranged near the burner head 110 of the furnace body 140, and an air outlet pipe 120 is arranged at the other end of the furnace body 140. 0, an air inlet pipe 130 is arranged on the radial side of the furnace body 140 near the air outlet pipe 120, the air outlet pipe 120 is arranged with an exhaust pipe connected to the kiln, the exhaust pipe and the furnace body 140 are connected by a flange, the outer wall of the furnace body 140 includes an outer shell 150, an intermediate layer 160 and a combustion-supporting layer 170 from the outside to the inside, the intermediate layer 160 is arranged with an opening on the side near the burner head 110, and the combustion-supporting layer 170 is arranged with an opening on the side near the air outlet pipe 120;

[0025] The wind flow entering the furnace body 140 through the air inlet pipe 130 flows through the space between the outer shell 150 and the middle layer 160 to one end near the burner head 110, flows along the space between the middle layer 160 and the combustion-supporting layer 170 to one end near the air inlet pipe 130, and then enters the center of the furnace body 140. The combustion-supporting layer 170 is provided with a plurality of vents, so that air enters the furnace body 140 through the vents and mixes with the combustibles entering from the burner head 110 to burn. A heat exchange coil 190 is installed on the air outlet pipe 120. Two heat-insulating outer shells 195 are sleeved on the air outlet pipe 120. The two heat-insulating outer shells 195 are fixed together. The water inlet pipe 191 and the water outlet pipe 193 both penetrate the heat-insulating outer shell 195. One end of the water inlet pipe 191 and one end of the water outlet pipe 193 are both threaded on the heat exchange coil 190. A first insulation sleeve 192 is provided on the water inlet pipe 191, and a second insulation sleeve 194 is provided on the water outlet pipe 193. The setting of the first insulation sleeve 192 and the second insulation sleeve 194 reduces heat spillover. Two insulation shells 195 are provided, and one of the insulation shells 195 has two through holes 196. The water inlet pipe 191 and the water outlet pipe 193 pass through different through holes 196. The setting of the through holes 196 facilitates the removal of the water inlet pipe 191 and the water outlet pipe 193 from the insulation shell 195, so as to facilitate the maintenance of the heat exchange coil 190. Threaded rods 197 are inserted into the two insulation shells 195, and nuts 198 are threadedly sleeved on the threaded rods 197. The setting of the threaded rods 197 and the nuts 198 facilitates the installation and fixation of the two insulation shells 195 on the air outlet pipe 120.

[0026] Specifically, the working principle of the flue gas waste heat recovery device for the drying machine is as follows: when in use, the burner head 110 supplies fuel to the furnace body 140, the air inlet pipe 130 supplies air to the furnace body 140, and the high-temperature gas after the fuel is burned enters the furnace through the air outlet pipe 120 to achieve the purpose of drying the furnace. The space between the outer shell 150 and the middle layer 160 forms a cold air duct, and the space between the middle layer 160 and the combustion-supporting layer 170 forms a temperature-regulating air duct. When the fuel is burned inside the furnace body 140, the air flow of the blower enters the cold air duct from the air inlet pipe 130 on the side of the drying machine, and blows from the head to the cold air duct along the cold air duct. The tail enters the temperature-regulating air duct, and the cold air is preheated in the cold air duct, thereby reducing the impact of the high temperature in the furnace body 140 on the outer shell, reducing the impact of the cold air on the hot and cold shock of the combustion area and reducing the fuel consumption. A large amount of wind in the temperature-regulating air duct blows from the tail to the head, thereby achieving the purpose of secondary heating of the cold air and reducing the fuel consumption. A small amount of wind is discharged from the vents of the combustion-supporting layer 170 and mixed with the flame heat in the combustion area; thereby achieving the temperature control by adjusting the air volume. The temperature-regulating air duct as a whole is a mixture of a small amount of wind and the flame heat blown to the head of the drying oven body, and then by the high wind pressure A large amount of wind mixes with it to form hot flue gas that is blown out of the drying machine body, and finally the purpose of hot flue gas baking the kiln is achieved. When the furnace is baked, water is injected into the water inlet pipe 191 through the water supply equipment, and the water is discharged through the water inlet pipe 191, the heat exchange coil 190 and the water outlet pipe 193. The water takes away the heat in the high-temperature gas during the process of passing through the air outlet pipe 120, so as to achieve the purpose of recovering the waste heat of the flue gas. When the heat exchange coil 190 needs to be repaired, the water inlet pipe 191 and the water outlet pipe 193 are unscrewed, and then the nut 198 and the threaded rod 197 are removed, and the two insulation shells 195 can be After the heat exchange coil 190 is removed and repaired, follow the above steps to reinstall the insulation shell 195, the water inlet pipe 191 and the water outlet pipe 193. The flue gas waste heat recovery device for the drying oven adopts wind cooling through the internal structure of the multi-layer air duct to fully reduce the weight and volume of the drying oven body, which is convenient for transportation, installation and operation during use. The water inlet pipe 191, the heat exchange coil 190 and the water outlet pipe 193 are used to recover the waste heat in the flue gas, avoid energy waste, and facilitate the repair of the heat exchange coil 190, bringing better user experience.

[0027] It should be noted that the specific models and specifications of the burner head 110, the furnace body 140 and the igniter 180 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0028] The power supply and principle of the furnace head 110, the furnace body 140 and the igniter 180 are clear to those skilled in the art and will not be described in detail here.

[0029] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A flue gas waste heat recovery device for a drying furnace, characterized in that: The furnace body (140) comprises a burner head (110), an air outlet pipe (120), an air inlet pipe (130), a furnace body (140), a heat exchange coil (190), a water inlet pipe (191), a water outlet pipe (193) and a heat-insulating outer shell (195); the burner head (110) is arranged at one end of the furnace body (140) in the axial direction; the air outlet pipe (120) is arranged at the other end of the furnace body (140); the air inlet pipe (130) is arranged on the radial side surface of the furnace body (140) close to the air outlet pipe (120); the outer wall of the furnace body (140) comprises an outer shell (150), an intermediate layer (160) and a combustion-supporting layer (170) from the outside to the inside; the intermediate layer (160) is provided with an opening on a side close to the burner head (110); and the combustion-supporting layer (170) is provided with an opening on a side close to the air outlet pipe (120); The airflow entering the furnace body (140) through the air inlet pipe (130) flows through the space between the outer shell (150) and the middle layer (160) to one end close to the burner head (110), flows along the space between the middle layer (160) and the combustion-supporting layer (170) to one end close to the air inlet pipe (130), and then enters the center of the furnace body (140), where it is mixed with the combustibles entering the burner head (110) and burns. The heat exchange coil (190) is installed on the air outlet pipe (120), the two heat-insulating outer shells (195) are sleeved on the air outlet pipe (120), the two heat-insulating outer shells (195) are fixed together, the water inlet pipe (191) and the water outlet pipe (193) both pass through the heat-insulating outer shells (195), and one end of the water inlet pipe (191) and one end of the water outlet pipe (193) are both threaded on the heat exchange coil (190).

2. The flue gas waste heat recovery device for a drying machine according to claim 1, characterized in that: The furnace body (140) is provided with an igniter (180) near the furnace head (110).

3. The flue gas waste heat recovery device for a drying machine according to claim 1, characterized in that: The combustion-supporting layer (170) is provided with a plurality of ventilation holes, so that air can enter the interior of the furnace body (140) through the ventilation holes.

4. The flue gas waste heat recovery device for a drying machine according to claim 1, characterized in that: The water inlet pipe (191) is covered with a first heat-insulating sleeve (192), and the water outlet pipe (193) is covered with a second heat-insulating sleeve (194).

5. The flue gas waste heat recovery device for a drying machine according to claim 1, characterized in that: Two heat-insulating outer shells (195) are provided, one of which has two through holes (196), and the water inlet pipe (191) and the water outlet pipe (193) pass through different through holes (196).

6. The flue gas waste heat recovery device for a drying machine according to claim 1, characterized in that: A threaded rod (197) is inserted into the two heat-insulating shells (195), and a nut (198) is threadedly sleeved on the threaded rod (197).

7. The device for recovering waste heat from flue gas used in a drying oven according to claim 1, characterized in that: The air outlet pipe (120) is provided with an exhaust pipe connected to the kiln, and the exhaust pipe is connected to the furnace body (140) via a flange.

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