Heat energy recovery device

Abstract

The utility model discloses a heat energy recovery and utilization device, including a waste heat boiler, an exhaust fan and a vertical drying device, wherein a heat exchange device is connected between the waste heat boiler and the exhaust fan, and the heat exchange device is also connected to the vertical drying device, and an air flow channel for heat exchange is provided in the heat exchange device, the air inlet end of the first air flow channel is connected to the air outlet end of the waste heat boiler, the air outlet end of the first air flow channel is connected to the exhaust fan, the air inlet end of the second air flow channel is connected to the air supply fan, and the air outlet end of the second air flow channel is connected to the oxidation furnace, and the first air flow channel and the second air flow channel are sealed and isolated, and cross-flow is used for heat exchange. The heat exchange device is used to exchange heat between fresh air and high-temperature flue gas, and the fresh air after heat exchange enters the vertical drying device, which saves the electric energy consumed by the temperature requirement for eliminating excess moisture in the carbon filaments after sizing treatment and drying them, thereby extending the service life of the equipment.

Description

Technical Field

[0001] The utility model belongs to the field of carbon fiber production technology, and specifically relates to a heat energy recovery and utilization device. Background Art

[0002] Carbon fiber is a special fiber composed of carbon elements. It has the characteristics of high temperature resistance, friction resistance, electrical conductivity, thermal conductivity and corrosion resistance. It is fibrous in appearance, soft, and can be processed into various fabrics. Because its graphite microcrystalline structure is preferentially oriented along the fiber axis, it has high strength and modulus along the current fiber axis direction, and the density of carbon fiber is low.

[0003] In the carbon fiber production process, the carbon fiber precursor needs to be pre-oxidized, and the pre-oxidized fiber needs to undergo a thermal decomposition reaction in a carbon fiber low-temperature carbonization furnace, producing a large amount of waste gas, oil smoke and carbon powder. Under the action of tar, the carbon powder will gather on the inner wall of the carbon fiber low-temperature carbonization furnace, especially on the top of the furnace to form deposits. When the deposits reach a certain thickness, they will affect the uniformity of the original temperature field in the furnace. If they fall off, they will adhere to the surface of the running tow and cause fiber defects. In the prior art, a large amount of waste is directly discharged from the carbonization furnace, and fresh air is introduced during the processing of the precursor. The air environment is heated by a heater, which consumes a lot of electricity, and the high-temperature waste gas generated is not effectively utilized.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a heat recovery and utilization device, which utilizes the high-temperature exhaust gas in the waste heat boiler to exchange heat with fresh air, and the fresh air after heat exchange is transmitted to the vertical drying device, thereby reducing the electric energy and power consumed by the heating device due to the temperature environment required for processing the carbon filaments after sizing, and at the same time extending the service life of the vertical drying device.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0007] A heat energy recovery and utilization device comprises a waste heat boiler, an exhaust fan and a vertical drying device, wherein a heat exchange device is connected between the waste heat boiler and the exhaust fan, and the heat exchange device is also connected to the vertical drying device, and an air flow channel for heat exchange is provided in the heat exchange device, the air inlet end of the first air flow channel is connected to the air outlet end of the waste heat boiler, the air outlet end of the first air flow channel is connected to the exhaust fan, the air inlet end of the second air flow channel is connected to the air supply fan, and the air outlet end of the second air flow channel is connected to an oxidation furnace, the airflow of high-temperature flue gas flows along the first air flow channel, and the airflow of fresh air is connected along the second air flow channel, the two air flow channels are sealed and isolated, and cross-flow is performed for heat exchange.

[0008] Furthermore, the heat exchange device includes a box body, which is a hollow plate-shaped structure. A plurality of fresh air ducts of the same size are arranged along the second air flow direction. The first air flow channel is provided with a plurality of fresh air ducts of the same size, and the distances between adjacent fresh air ducts are the same.

[0009] Furthermore, two lining plates are provided in the heat exchange device, and a plurality of through holes are provided on the lining plates, the number of the through holes is the same as the number of the fresh air duct, the two lining plates are respectively arranged at both ends of the fresh air duct, and the fresh air duct is sealed and connected to the lining plates through the through holes, the outside of the fresh air duct constitutes a first air flow channel, and the inside of the fresh air duct constitutes a second air flow channel.

[0010] Furthermore, the first air flow channel is respectively provided with a first opening and a second opening along the air flow direction of the high-temperature flue gas, the first opening is connected to the flue gas outlet of the waste heat boiler, the second opening is connected to the exhaust fan, and the second air flow channel is respectively provided with a third opening and a fourth opening along the fresh air flow direction, the third opening is used as a fresh air inlet to introduce fresh air, and the fourth opening is connected to the vertical drying device.

[0011] Furthermore, a manual passage which can be sealed and opened is provided on one side of the heat exchange device close to the first opening.

[0012] Furthermore, a cleaning channel which can be sealed and opened is provided on one side of the heat exchange device corresponding to the fresh air duct.

[0013] Furthermore, an outer wall of the heat exchange device is provided with a thermal insulation layer.

[0014] Furthermore, the first opening and the third opening expand and extend in a conical shape along the flow direction of the high-temperature flue gas and the fresh air.

[0015] Furthermore, the second opening and the fourth opening extend in a tapered manner along the flow direction of the high-temperature flue gas and the fresh air.

[0016] Furthermore, the third opening and the fourth opening are arranged on the same side and are sealed and isolated.

[0017] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0018] 1. The utility model connects the waste heat boiler and the exhaust fan through a heat exchange device, and the fresh air is introduced into the heat exchange device to exchange heat with the high-temperature flue gas. The preheated fresh air is transported to the vertical drying device, thereby reducing the electric energy consumed by the vertical drying device to meet the temperature environment required for processing the sizing carbon filaments, improving the heat energy recovery rate, and increasing the service life of the vertical drying device;

[0019] 2. The utility model also arranges the third opening and the fourth opening on the same side to increase the time that the fresh air is in the first airflow channel, thereby achieving a sufficient heat exchange effect. Further, the utility model passes through a plurality of fresh air ducts to increase the heat exchange area and enhance the heat exchange efficiency, thereby achieving sufficient heat exchange and energy saving and emission reduction.

[0020] 3. The utility model also reduces the flow speed of the smoke and fresh air in the air flow channel by expanding or reducing the first opening, the second opening, the third opening and the fourth opening along the flow direction of the smoke and fresh air, so that the smoke and fresh air can fully exchange heat, and the smoke and fresh air after heat exchange can flow out quickly, thereby improving production efficiency;

[0021] 4. The utility model also provides a manual channel and a cleaning channel that can be sealed and opened on the heat exchange device to keep it sealed during the heat exchange process to avoid affecting the heat exchange effect. After the workshop stops operating, the channel is opened to manually clean the impurities brought by the smoke in the air flow channel. At the same time, the fresh air duct can be inspected and maintained to ensure the heat exchange efficiency.

[0022] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0024] Figure 1 It is a cross-sectional schematic diagram of the front view of the heat exchange device of the utility model;

[0025] Figure 2 It is a cross-sectional schematic diagram of a side view of the heat exchange device of the utility model;

[0026] Figure 3 It is a cross-sectional schematic diagram of a top view of the heat exchange device of the utility model.

[0027] In the figure: 1, the third opening; 2, the lining plate; 3, the manual passage; 4, the first opening; 5, the cleaning passage; 6, the second opening; 7, the fresh air passage; 8, the fourth opening; 9, the insulation layer.

[0028] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figures 1 to 3 As shown, the utility model discloses a heat energy recovery and utilization device, including a waste heat boiler, an exhaust fan and a vertical drying device. The waste heat boiler and the vertical drying device are connected through a heat energy recovery heat exchange device. The air outlet of the waste heat boiler is connected to the heat exchange device through a pipeline. The new air after heat exchange is connected to the vertical drying device to eliminate excess moisture in the carbon filaments after sizing treatment.

[0033] A further implementation scheme is that the heat exchange device includes a box body, and a fresh air duct 7 and a shell channel which are welded to each other, the fresh air duct 7 is cylindrical, and the shell channel is on the outside of the fresh air duct 7, the shell channel passes high-temperature flue gas, and the fresh air duct 7 introduces fresh air, and the heat exchange device is internally enclosed with a first air flow channel and a second air flow channel, high-temperature flue gas is introduced into the first air flow channel, and the second air flow channel is partially arranged in the first air flow channel for introducing fresh air and exchanging heat with the high-temperature flue gas in the first air flow channel, and the fresh air after heat exchange is introduced into a vertical drying device, and the vertical drying device is used to dry the carbon filaments after sizing, and the drying process requires a certain temperature environment, and temperature compensation is performed by the electric heater in the vertical drying device, and the temperature in the vertical drying device is increased to a certain extent by the fresh air after heat exchange, thereby saving the electric energy and time consumed during temperature compensation, increasing the service life of the electric heater, improving production efficiency, and increasing economic benefits.

[0034] In a further implementation scheme, a first opening 4 and a second opening 6 are respectively provided on both sides of the heat exchange device along the direction of the high-temperature flue gas. The first opening 4 is connected to the waste heat boiler, and the high-temperature flue gas enters the first air flow channel of the heat exchange device from the first opening 4. The second opening 6 is connected to the exhaust fan to quickly discharge the flue gas after heat exchange. The heat exchange device is also provided with a third opening 1 and a fourth opening 8. The third opening 1 and the fourth opening 8 are connected through a fresh air duct 7. The third opening 1 is connected to the air supply fan to supply fresh air, and the fourth opening 8 is connected to a vertical drying circulating air duct. The fresh air after heat exchange enters the vertical drying device through the duct to eliminate excess moisture from the carbon filaments after sizing treatment, dry them, and avoid adhesion. After heat exchange through the heat recovery heat exchange device, the fresh air entering the vertical drying circulating air duct has a certain temperature, which reduces the heating power of the vertical drying system, saves electric energy, and reduces the frequency of the fan, thereby improving the performance of the fiber, improving production efficiency, and increasing economic benefits.

[0035] In a further embodiment, the first opening 4 expands and extends in a conical shape along the flow direction of the high-temperature flue gas. When the high-temperature flue gas enters the first opening 4, the flow velocity decreases, thereby increasing the time that the high-temperature flue gas stays in the first airflow channel. The second opening 6 shrinks and extends in a conical shape along the flow direction of the flue gas, so that the flue gas after heat exchange flows out quickly. The smoke flow cross-section at the first opening 4 is the same as the smoke flow cross-section at the second opening 6. The third opening 1 expands and extends in a conical shape along the flow direction of the fresh air, so that the flow velocity of the fresh air decreases when it flows into the third opening 1. The fresh air duct 7 constitutes part of the second airflow channel. The fresh air is in the fresh air duct 7 and exchanges heat with the high-temperature flue gas in the first airflow channel. The fourth opening 8 shrinks and extends in a conical shape along the flow direction of the fresh air. The fresh air flow cross-section at the third opening 1 is the same as the fresh air flow cross-section at the fourth opening 8. The airflow velocity is changed by the above-mentioned setting to ensure sufficient heat exchange in the heat exchange device, ensure the utilization rate of thermal energy, further improve production efficiency, and increase economic benefits.

[0036] In a further embodiment, the third opening 1 and the fourth opening 8 are on the same side of the heat recovery and heat exchange device, and the fresh air duct 7 is provided with a plurality of air ducts 7 evenly distributed in the first air flow channel portion. After the fresh air passes through the fresh air duct 7 corresponding to the third opening 1, it enters the fresh air duct 7 corresponding to the fourth opening 8 along the air flow direction. By extending the flow distance of the fresh air and extending the heat exchange time of the fresh air, the fresh air is made more sufficient and the utilization rate of thermal energy is improved.

[0037] In a further implementation scheme, lining plates 2 are provided at both ends of the fresh air duct 7, and through holes corresponding to the number and outer diameter of the fresh air duct 7 are provided on the lining plates 2. Both ends of the fresh air duct 7 extend through the through holes into the second air flow channel, and the lining plates 2 seal and divide the interior of the heat exchange device into a first air flow channel and a second air flow channel. The first air flow channel and the second air flow channel are sealed and divided by the lining plates 2 to prevent impurities in the flue gas from being transported to the vertical drying device with the fresh air and affecting the quality of the carbon filaments.

[0038] In a further embodiment, the heat exchange device is further provided with a cleaning channel 5, which is arranged on a side corresponding to the third opening 1. The cleaning channel 5 is provided with a sealable switch channel, which closes the channel during the heat exchange process to prevent fresh air from flowing out through the cleaning channel.

[0039] In a further embodiment, an artificial channel 3 with a sealable switch is provided on one side of the first airflow channel near the first opening 4, which is used to manually clean the first airflow channel. When the heat exchange device is exchanging heat, the artificial channel 3 is sealed and closed to prevent high-temperature flue gas from flowing out through the artificial channel 3, causing heat loss and affecting workshop production. When the heat exchange device stops exchanging heat, the artificial channel 3 is opened, and the operator enters the first airflow channel through the artificial channel 3 to clean impurities brought out by the high-temperature flue gas and retained in the first airflow channel. At the same time, the fresh air duct 7 in the first airflow channel can also be inspected and maintained to avoid a decrease in sealing due to high temperature, thereby affecting heat transfer.

[0040] A further implementation scheme is that an insulation layer 9 is provided on the outer wall of the heat exchange device, and the insulation layer 9 is provided on the two side walls of the corresponding heat exchange area. The insulation layer 9 prevents the natural loss of heat of the high-temperature flue gas in the first airflow channel, thereby improving the utilization rate of thermal energy.

[0041] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A heat recovery device, comprising a waste heat boiler, an exhaust fan and a vertical drying device, characterized in that: A heat exchange device is connected between the waste heat boiler and the exhaust fan, and the heat exchange device is also connected to the vertical drying device. A first air flow channel and a second air flow channel for heat exchange are provided in the heat exchange device. The air inlet end of the first air flow channel is connected to the air outlet end of the waste heat boiler, the air outlet end of the first air flow channel is connected to the exhaust fan, the air inlet end of the second air flow channel is connected to the air supply fan, and the air outlet end of the second air flow channel is connected to the oxidation furnace. The high-temperature flue gas flows along the first air flow channel, and the fresh air flow flows along the second air flow channel. The first air flow channel and the second air flow channel are sealed and isolated, and cross-flow for heat exchange.

2. A heat recovery device according to claim 1, characterized in that: The heat exchange device comprises a box body, the box body is a hollow plate-shaped structure, a plurality of fresh air ducts (7) of the same size are arranged along the second air flow direction in the first air flow channel, and the spacing between adjacent fresh air ducts (7) is the same.

3. A heat recovery device according to claim 2, characterized in that: Two lining plates (2) are provided in the heat exchange device, and a plurality of through holes are provided on the lining plates (2), the number of the through holes being the same as the number of the fresh air duct (7), the two lining plates (2) being respectively arranged at both ends of the fresh air duct (7), the fresh air duct (7) passing through the through holes and being sealedly connected to the lining plates (2), the outside of the fresh air duct (7) forming a first air flow channel, and the inside of the fresh air duct (7) forming a second air flow channel.

4. A heat recovery device according to claim 3, characterized in that: The first air flow channel is provided with a first opening (4) and a second opening (6) along the air flow direction of the high-temperature flue gas, the first opening (4) is connected to the flue gas outlet of the waste heat boiler, the second opening (6) is connected to the exhaust fan, and the second air flow channel is provided with a third opening (1) and a fourth opening (8) along the flow direction of fresh air, the third opening (1) serves as a fresh air inlet for introducing fresh air, and the fourth opening (8) is connected to the vertical drying device.

5. A heat energy recovery and utilization device according to claim 4, characterized in that: The first air flow channel extends in a conical shape from the first opening (4) along the direction of smoke flow; The second opening (6) extends in a tapered shape along the direction of smoke flow, and the smoke flow cross section at the first opening (4) is the same as the smoke flow cross section at the second opening (6).

6. A heat energy recovery and utilization device according to claim 4, characterized in that: The second air flow channel extends in a conical shape from the third opening (1) along the fresh air flow direction; The fourth opening (8) extends in a tapered shape along the fresh air flow direction, and the fresh air flow cross section at the fourth opening (8) is the same as the fresh air flow cross section at the third opening (1).

7. A heat recovery device according to any one of claims 1 to 6, characterized in that: An artificial channel (3) capable of being sealed and opened is provided on one side of the first airflow channel.

8. A heat energy recovery and utilization device according to claim 7, characterized in that: A cleaning channel (5) capable of sealing a switch is provided on one side of the second air flow channel.

9. A heat energy recovery and utilization device according to claim 8, characterized in that: The outer wall of the heat exchange device is provided with a thermal insulation layer (9).

10. A heat energy recovery and utilization device according to claim 9, characterized in that: The air inlet end and the air outlet end of the second air flow channel are arranged on the same side and are sealed and isolated.

Images