A steam recovery and reuse system for carbon fiber production equipment

Abstract

This utility model discloses a steam recovery and reuse system for a carbon fiber production apparatus, relating to the technical field of carbon fiber production equipment. The system includes a steam generator, an oxidation furnace, and a waste heat recovery mechanism. The waste heat recovery mechanism is connected to both the steam generator and the oxidation furnace, receiving steam generated by the steam generator and exchanging heat between the steam and the air pre-input into the oxidation furnace. The air, after heat exchange with the steam, is then transported back into the oxidation furnace. This utility model utilizes the high temperature of steam to preheat the air input into the oxidation furnace, shortening the heating time required for the oxidation furnace and improving energy efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of carbon fiber production equipment, specifically, it relates to a steam recovery and reuse system for carbon fiber production equipment. Background Technology

[0002] Carbon fiber, produced from acrylonitrile as a raw material through high-temperature oxidation and carbonization, is an excellent material for manufacturing high-tech equipment in aerospace and other fields. Steam is an indispensable energy medium in the production process of carbon fiber. However, existing steam generators produce excess steam, and there are certain limitations in handling this excess steam.

[0003] Currently, in the carbon fiber production process, traditional steam treatment usually involves installing a pressure sensor inside the steam generator to detect the internal pressure value in real time. When the pressure value exceeds the safety threshold, the pressure sensor transmits a signal to an external controller, which then controls the pressure relief valve to open automatically to release excess steam.

[0004] However, during the above process, depressurization and discharge will result in a large amount of high-quality heat energy being directly released into the atmosphere, causing energy loss and further reducing energy utilization.

[0005] In view of this, this utility model is hereby proposed. Utility Model Content

[0006] In order to solve at least some of the above-mentioned problems, this utility model provides a steam recovery and reuse system for a carbon fiber production apparatus.

[0007] The basic concept of the technical solution adopted in this utility model is:

[0008] A steam recovery and reuse system for a carbon fiber production apparatus includes a steam generator, an oxidation furnace, and a waste heat recovery mechanism. The waste heat recovery mechanism is connected to the steam generator and the oxidation furnace respectively, and is used to receive the steam generated by the steam generator, exchange heat between the air pre-input into the oxidation furnace and the steam, and then transport the air after heat exchange with the steam into the oxidation furnace.

[0009] Furthermore, the waste heat recovery mechanism includes a heat exchanger and an air supply assembly. The heat exchanger is connected to both the steam generator and the oxidizer. The air supply assembly is connected to the heat exchanger and is used to supply air pre-input into the oxidizer into the heat exchanger. When air enters the heat exchanger, the heat exchanger is used to exchange heat between the steam and the air, and then deliver the air after heat exchange with the steam into the oxidizer.

[0010] Furthermore, the waste heat recovery mechanism also includes a conveying assembly, which includes a first input pipe, a first output pipe, and a second input pipe. One end of the first input pipe is connected to a heat exchanger, and the other end is connected to an air supply assembly. One end of the first output pipe is connected to the heat exchanger, and the other end is connected to an oxidizer; one end of the second input pipe is connected to the heat exchanger, and the other end is connected to a steam generator.

[0011] Furthermore, the air supply assembly includes a fan whose output end is connected to the first input pipeline for drawing air pre-input into the oxidation furnace into the heat exchanger.

[0012] Furthermore, the conveying assembly also includes a second output pipe, one end of which is connected to the heat exchanger and the other end is connected to the outside, for discharging condensate after the steam has cooled down.

[0013] Furthermore, the other end of the second output pipe is bent downwards relative to the horizontal direction.

[0014] Furthermore, the waste heat recovery mechanism also includes a water collection container, which is located below the other end of the second output pipeline.

[0015] Furthermore, the steam recovery and reuse system also includes a backup mechanism connected to the steam generator, which is used to discharge the steam from the steam generator when the gas pressure inside the steam generator reaches a preset threshold.

[0016] Furthermore, the backup mechanism includes a backup pipeline and a pressure relief valve. One end of the backup pipeline is connected to the steam generator, and the other end is connected to the outside. The pressure relief valve is installed on the backup pipeline.

[0017] This utility model has at least the following beneficial effects:

[0018] 1. This utility model, through a waste heat recovery mechanism, can utilize the high temperature of steam to preheat the air preheated into the oxidation furnace, thereby realizing heat exchange between steam and air. It can not only condense and recover excess steam, but also shorten the heating time required for the oxidation furnace by preheating the air, thus improving energy utilization.

[0019] 2. This utility model, through a backup mechanism, can promptly discharge uncondensable steam when the internal pressure of the steam generator exceeds the limit. On the one hand, it can effectively prevent the steam recovery and reuse system from malfunctioning and reduce equipment maintenance costs. On the other hand, it can also effectively reduce safety hazards and protect personnel safety. Attached Figure Description

[0020] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0021] Figure 1 A schematic diagram of an embodiment of the present invention is shown.

[0022] In the picture:

[0023] 1. Steam generator; 2. Oxidizer; 31. Heat exchanger; 32. Fan; 33. Conveying assembly; 331. First input pipeline; 332. First output pipeline; 333. Second input pipeline; 334. Second output pipeline; 34. Water collection container; 4. Backup mechanism; 41. Backup pipeline; 42. Pressure relief valve.

[0024] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 As shown, this utility model provides a steam recovery and reuse system for a carbon fiber production device, including a steam generator 1, an oxidation furnace 2, and a waste heat recovery mechanism.

[0029] It should be noted that the carbon fiber production device (not shown in the figure) includes at least a feeding mechanism, a reaction mechanism, a processing mechanism, and a winding mechanism. The feeding mechanism is used to unwind the wound carbon fiber precursor.

[0030] For example, the reaction mechanism includes an oxidation component and a carbonization component. The oxidation component is used to heat the carbon fiber precursor to form a pre-oxidized fiber. The carbonization component can be used in conjunction with an exhaust gas treatment device to heat the pre-oxidized fiber at high temperature, thereby making the pre-oxidized fiber form a more stable structure, which is conducive to subsequent high-temperature carbonization.

[0031] For example, the oxidation assembly may include an oxidation furnace 2 and a heater, with the heater disposed on the oxidation furnace 2. The carbonization assembly may be a carbonization furnace group, specifically including a low-temperature carbonization furnace and a high-temperature carbonization furnace. The low-temperature carbonization furnace is used to remove non-carbon elements from the pre-oxidized filaments in an inert gas, and the high-temperature carbonization furnace is used to graphitize the fibers.

[0032] For example, a processing mechanism is used to coat the carbonized filament bundle with a sizing agent, and a winding mechanism is used to wind the sizing agent-coated filament bundle onto a filament bobbin.

[0033] For example, the processing apparatus may include a sizing assembly and a drying assembly. The sizing assembly is used to coat the carbonized filament bundle with a sizing agent (such as resin), and the drying assembly is used to dry the sizing agent on the filament bundle. The drying assembly includes a drying oven and a heating element assembly, which includes an electric heater and a steam heat exchanger. The steam heat exchanger assists the electric heater in providing heat to the drying oven for drying the sizing filament bundle.

[0034] A steam heat exchanger, in conjunction with an electric heater, provides a heat source and uses circulating air to dry the sized fiber bundles. The oxidation furnace 2 can be used in conjunction with a waste gas treatment device to preheat the carbon fiber precursor.

[0035] According to the example embodiment, such as Figure 1 As shown, the waste heat recovery mechanism is connected to the steam generator 1 and the oxidizer 2 respectively. It is used to receive the steam generated by the steam generator 1, and to exchange heat between the air and steam that are pre-input into the oxidizer 2. Then, the air after heat exchange with the steam is transported into the oxidizer 2.

[0036] For example, the waste heat recovery mechanism may include a heat exchanger 31, an air supply assembly, and a conveying assembly 33. The heat exchanger 31 is connected to the air supply assembly, the steam generator 1, and the oxidizer 2 respectively through the conveying assembly 33. The air supply assembly is used to supply air pre-input into the oxidizer 2 into the heat exchanger 31. The heat exchanger 31 is used to exchange heat between steam and air, and to convey the air after heat exchange with steam into the oxidizer 2.

[0037] Through the above embodiments, this invention uses the conveying assembly 33 to send steam into the heat exchanger 31 and also sends air input into the pre-oxidation furnace 2 into the heat exchanger 31. This invention utilizes the heat exchanger 31 to preheat the air input into the oxidation furnace 2 under the high temperature of the steam. Through heat exchange, the steam condenses into water for easy recovery. The preheated air is then sent into the oxidation furnace 2 via the conveying assembly 33, shortening the heating time required for the oxidation furnace 2 and reducing the electric heating load on the oxidation furnace 2, thereby improving energy utilization.

[0038] According to the example embodiment, such as Figure 1 As shown, the waste heat recovery mechanism includes a heat exchanger 31 and an air supply assembly. The heat exchanger 31 is connected to both the steam generator 1 and the oxidizer 2. The air supply assembly is connected to the heat exchanger 31 and is used to supply air pre-input into the oxidizer 2 into the heat exchanger 31. When air enters the heat exchanger 31, the heat exchanger 31 is used to exchange heat between the steam and the air, and then delivers the air after heat exchange with the steam into the oxidizer 2.

[0039] For example, such as Figure 1 As shown, the air supply assembly can be a fan 32, specifically a variable frequency centrifugal fan 32. The heat exchanger 31 can be a spiral finned tube heat exchanger 31, which can be provided with a steam passage (not shown in the figure) and an air passage (not shown in the figure). The steam passage of the spiral finned tube heat exchanger 31 is connected to the outlet pipe of the steam generator 1 (not shown in the figure) through a flange, and the air passage of the spiral finned tube heat exchanger 31 is sealed and connected to the air outlet (not shown in the figure) of the variable frequency centrifugal fan 32.

[0040] Through the above embodiments, this utility model sends steam from the outlet pipe of the steam generator 1 into the spiral finned tube heat exchanger 31. At the same time, the variable frequency centrifugal fan 32 sends the air pre-input into the oxidizer 2 into the spiral finned tube heat exchanger 31. Through the spiral finned tube heat exchanger 31, the steam and air exchange heat, and the steam condenses into water for easy recovery. The preheated air is sent into the oxidizer 2 through the conveying component 33, which shortens the heating time required for the oxidizer 2 and also reduces the electric heating load of the oxidizer 2, thereby improving energy utilization.

[0041] According to the example embodiment, such as Figure 1 As shown, the waste heat recovery mechanism also includes a conveying assembly 33, which includes a first input pipe 331, a first output pipe 332, and a second input pipe 333. One end of the first input pipe 331 is connected to the heat exchanger 31, and the other end is connected to the air supply assembly. One end of the first output pipe 332 is connected to the heat exchanger 31, and the other end is connected to the oxidizer 2. One end of the second input pipe 333 is connected to the heat exchanger 31, and the other end is connected to the steam generator 1.

[0042] For example, such as Figure 1 As shown, the first input pipe 331 can be made of 310S stainless steel. One end is connected to the air passage of the heat exchanger 31 via flange bolts, and the other end is sealed to the air outlet of the fan 32 via a flange. Sealing rings are provided at both ends of the first input pipe 331. The first output pipe 332 can also be made of 310S stainless steel, and its outer wall can be covered with insulation material. One end is connected to the air passage of the heat exchanger 31 via flange bolts, and the other end is bolted to the air inlet of the oxidizer 2 via a flange. The second input pipe 333 can also be made of 310S stainless steel, and its inner wall can be coated with an alumina ceramic coating. One end is connected to the steam passage of the heat exchanger 31 via flange bolts, and the other end is connected to the outlet pipe of the steam generator 1 via a flange.

[0043] Through the above embodiments, this utility model improves the wind pressure resistance of the first input pipe 331 by using flange bolts and sealing rings; this utility model also uses stainless steel and insulation materials to keep the heated air warm and prevent heat loss; this utility model also uses stainless steel and alumina ceramic coating to improve the high temperature resistance of the second input pipe 333, thereby effectively preventing pipe damage and gas leakage, reducing maintenance costs and improving energy transmission efficiency.

[0044] According to the example embodiment, such as Figure 1 As shown, the air supply assembly includes a fan 32, the output of which is connected to the first input pipe 331, for drawing air pre-input into the oxidation furnace 2 into the heat exchanger 31.

[0045] For example, such as Figure 1 As shown, the fan 32 can be electrically connected to an external control element. The output end of the fan 32 is the air outlet of the variable frequency centrifugal fan 32, and the input end of the fan 32 is the air inlet of the variable frequency centrifugal fan 32. Under the control of the electrical signal of the external control element, the variable frequency centrifugal fan 32 draws in the outside air through the air inlet and delivers the air to the heat exchanger 31 through the air outlet.

[0046] Through the above embodiments, the present invention continuously supplies air through the fan 32, which exchanges heat with the high-temperature steam, thereby continuously providing preheated air for the oxidation furnace 2, reducing the electric heating load of the oxidation furnace 2, shortening the heating time required for the oxidation furnace 2, and thus improving energy utilization.

[0047] According to the example embodiment, such as Figure 1 As shown, the conveying assembly 33 also includes a second output pipe 334, one end of which is connected to the heat exchanger 31 and the other end is connected to the outside, for discharging condensate after the steam has cooled down.

[0048] For example, such as Figure 1 As shown, one end of the second output pipe 334 is connected to the steam passage of the heat exchanger 31 via flange bolts.

[0049] Through the above embodiments, the present invention can guide condensate water in a timely manner through the second output pipe 334, making it convenient for operators to collect condensate water and improving operational convenience.

[0050] According to the example embodiment, such as Figure 1 As shown, the other end of the second output pipe 334 is bent downwards relative to the horizontal direction.

[0051] For example, the other end of the second output conduit 334 is bent downwards at an angle α relative to the horizontal direction, where 0° < α ≤ 90°. For example, as shown... Figure 1 As shown, α is 90°.

[0052] Through the above embodiments, by vertically bending the second output pipe 334, the present invention makes it difficult for condensate to flow back along the second output pipe 334. This not only prevents condensate backflow but also avoids condensate flowing along the outer wall of the second output pipe 334, which would be detrimental to collection and cause waste, thereby improving energy utilization.

[0053] According to the example embodiment, such as Figure 1 As shown, the waste heat recovery mechanism also includes a water collection container 34, which is located below the other end of the second output pipe 334.

[0054] For example, the water collection container 34 may be, but is not limited to, a bottle structure or a barrel structure.

[0055] For example, the water collection container 34 has a barrel structure with an opening at the top. An infrared sensor (not shown in the figure) that communicates with an external control element can also be installed on the opening of the water collection container 34 to monitor the liquid level in the water collection container 34.

[0056] Through the above embodiments, this utility model can promptly recover condensate by setting up a water collection container 34, thus avoiding waste of condensate.

[0057] According to the example embodiment, such as Figure 1 As shown, the steam recovery and reuse system also includes a backup mechanism 4, which is connected to the steam generator 1. When the gas pressure in the steam generator 1 reaches a preset threshold, the backup mechanism 4 is used to discharge the steam in the steam generator 1.

[0058] For example, the preset threshold can be set according to actual production needs, such as 1.25 times the normal operating pressure value. The backup mechanism 4 includes a backup pipeline 41 and a pressure relief valve 42. One end of the backup pipeline 41 is connected to the steam generator 1, and the other end is connected to the outside. The pressure relief valve 42 is installed on the backup pipeline 41.

[0059] For example, the backup pipeline 41 can be made of carbon steel, and one end of the backup pipeline 41 is fixedly connected to the steam generator 1 via a flange. The pressure relief valve 42 can be a spring-loaded pressure relief valve 42.

[0060] Through the above embodiments, when the internal gas pressure of the steam generator 1 exceeds the limit, the present invention can promptly discharge the uncondensable steam. On the one hand, it can effectively prevent the steam recovery and reuse system from malfunctioning and reduce equipment maintenance costs. On the other hand, it can also effectively reduce safety hazards and protect personnel safety.

[0061] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A steam recovery and reuse system for a carbon fiber production plant, characterized in that, The steam recovery and reuse system includes: Steam generator; Oxidation furnace; The waste heat recovery mechanism is connected to the steam generator and the oxidation furnace respectively. It is used to receive the steam generated by the steam generator, exchange heat between the air and steam that are to be pre-input into the oxidation furnace, and then deliver the air after heat exchange with the steam into the oxidation furnace.

2. The steam recovery and reuse system for a carbon fiber production apparatus according to claim 1, characterized in that, The waste heat recovery mechanism includes: A heat exchanger is connected to both the steam generator and the oxidation furnace; An air supply assembly, connected to the heat exchanger, is used to supply air pre-input into the oxidation furnace into the heat exchanger; When the air enters the heat exchanger, the heat exchanger is used to exchange heat between the steam and the air, and to deliver the air after heat exchange with the steam to the oxidation furnace.

3. A steam recovery and reuse system for a carbon fiber production apparatus according to claim 2, characterized in that, The waste heat recovery mechanism further includes a conveying assembly, which comprises: The first input pipeline is connected at one end to the heat exchanger and at the other end to the air supply assembly; The first output pipeline is connected at one end to the heat exchanger and at the other end to the oxidation furnace; The second input pipeline is connected at one end to the heat exchanger and at the other end to the steam generator.

4. A steam recovery and reuse system for a carbon fiber production apparatus according to claim 3, characterized in that, The air supply assembly includes: A blower, the output end of which is connected to the first input pipeline, is used to draw air that is to be input into the oxidation furnace into the heat exchanger.

5. A steam recovery and reuse system for a carbon fiber production apparatus according to claim 3, characterized in that, The conveying assembly also includes: The second output pipeline, with one end connected to the heat exchanger and the other end connected to the outside, is used to discharge the condensate after the steam has cooled down.

6. A steam recovery and reuse system for a carbon fiber production apparatus according to claim 5, characterized in that, The other end of the second output pipeline is bent downwards relative to the horizontal direction.

7. A steam recovery and reuse system for a carbon fiber production apparatus according to claim 5, characterized in that, The waste heat recovery mechanism also includes: A water collection container is located below the other end of the second output pipeline.

8. A steam recovery and reuse system for a carbon fiber production apparatus according to any one of claims 1-7, characterized in that, Also includes: A backup mechanism, connected to the steam generator, is used to discharge steam from the steam generator when the gas pressure inside the steam generator reaches a preset threshold.

9. A steam recovery and reuse system for a carbon fiber production apparatus according to claim 8, characterized in that, The backup mechanism includes: A backup pipeline is connected at one end to the steam generator and at the other end to the outside. A pressure relief valve is installed on the backup pipeline.

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