Waste heat recycling system and method for carburant production
By designing a waste heat recovery system for the calcining furnace and pretreatment components during the production of carbon raisers, the problems of heat energy waste and heat exchanger blockage in the treatment of high-temperature volatile gases were solved, achieving efficient waste heat recovery and raw material preheating, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-21
- Publication Date
- 2026-04-14
AI Technical Summary
In the existing technology, the way high-temperature volatile gases are handled during the production of carbon raisers leads to the waste of high-quality heat energy. Traditional heat exchangers are prone to clogging and have high maintenance costs. The drying and pretreatment of raw materials requires an additional heat source, which increases production costs.
Design a waste heat recovery and utilization system including a calcination furnace and a pretreatment component. High-temperature volatiles are transported to the pretreatment tank through a volatiles conveying pipe to exchange heat with carbon-containing raw materials, thereby achieving preheating and drying of the raw materials. A distributed gas distribution system is adopted to improve the gas-solid contact area and uniformity, avoid local overheating or short circuits, and reduce energy consumption.
It achieves efficient recovery and utilization of the heat energy of high-temperature volatiles, avoids waste from direct incineration, reduces the risk of blockage in traditional heat exchangers, reduces energy consumption for raw material drying, and lowers production costs.
Smart Images
Figure CN121855263A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of carbon raiser production technology, specifically to a waste heat recovery and utilization system and method for carbon raiser production. Background Technology
[0002] Carbon refining agents are important additives used in steel smelting and casting processes to increase the carbon content of molten iron, and their quality directly affects the quality of the final steel product. Currently, high-quality carbon refining agents are mainly produced by calcining carbon-containing raw materials such as washed coal in a high-temperature calcining furnace under air-isolated conditions to remove volatile matter, moisture, and impurities, thereby increasing the fixed carbon content.
[0003] During calcination, a large amount of high-temperature volatile gases are produced, typically reaching temperatures of 600-900℃, mainly composed of methane, hydrogen, and tar vapor. Currently, the treatment of these high-temperature volatiles mainly involves direct incineration or indirect heat exchange to recover waste heat. Direct incineration wastes high-quality thermal energy; while traditional shell-and-tube and finned heat exchangers are prone to coking and blockage when used to treat such tar-containing flue gas, resulting in rapid decline in heat exchange efficiency and high maintenance costs. At the same time, the drying pretreatment of raw materials before entering the furnace requires an additional heat source, increasing production costs. Summary of the Invention
[0004] This application provides a waste heat recovery and utilization system and method for carbonizer production, which solves the problems of existing technologies that use direct combustion or indirect heat exchange to recover waste heat when treating high-temperature volatile gases generated during carbonizer processing. Direct combustion wastes high-quality heat energy; while traditional shell-and-tube and finned heat exchangers are prone to coking and blockage when used to treat such tar-containing flue gas, resulting in rapid decline in heat exchange efficiency and high maintenance costs; at the same time, the drying and pretreatment of raw materials before entering the furnace requires an additional heat source, which increases production costs.
[0005] This application provides a waste heat recovery and utilization system for carbon raiser production, including a calcining furnace and a pretreatment component. The top of the calcining furnace is connected to a volatile matter conveying pipe, and the other end of the volatile matter conveying pipe is connected to the pretreatment component. The pretreatment component includes a pretreatment tank. A feed inlet is provided on one side of the top of the pretreatment tank, and a discharge outlet is provided on one side of the bottom of the pretreatment tank. Gas distribution branch pipes are evenly distributed inside the pretreatment tank. One end of the multiple gas distribution branch pipes is connected to a gas distribution assembly at the bottom of the pretreatment tank. The end of the gas distribution assembly away from the gas distribution branch pipes is connected to the volatile matter conveying pipe. The other end of the multiple gas distribution branch pipes is connected to an exhaust pipe through a collection chamber.
[0006] Preferably, the volatile matter conveying pipe is equipped with an induced draft fan and a regulating valve.
[0007] Preferably, the side wall of the air distribution branch pipe is also connected to a vent pipe, and the vent pipe is inclined downward.
[0008] Preferably, the gas distribution assembly includes a flow distribution chamber connected to the volatile matter conveying pipe, a flow guide plate is provided on the upper side of the inner wall of the flow distribution chamber, and a plurality of flow guide grooves arranged in a ring array are opened on the outer wall of the flow guide plate.
[0009] Preferably, the number of the guide channels is the same as the number of the air distribution branches, and the positions of the output ends of the multiple guide channels correspond to the positions of the input ends of the multiple air distribution branches.
[0010] Preferably, a conveying device is provided at the discharge port of the pretreatment tank, and the discharge end of the conveying device is connected to the feeding port of the calcining furnace.
[0011] Preferably, the collection chamber is disposed through the top of the pretreatment tank.
[0012] To address the aforementioned technical problems, this application also provides a method for recovering and utilizing waste heat from the production of carbon raiser, comprising the following steps: S1: Add carbon-containing raw materials to the pretreatment tank; S2: Start the calcining furnace to generate high-temperature volatiles; S3: The high-temperature volatiles are drawn out from the calcining furnace and transported to the pretreatment tank; S4: High-temperature volatiles are dispersed through the gas distribution components and exchange heat with the carbon-containing raw materials in the pretreatment tank, so that the raw materials are preheated and dried, while the volatiles are cooled. S5: The preheated and dried raw materials are transported to the calcining furnace for high-temperature calcination; S6: The volatile exhaust gas, which has been cooled down after heat exchange, is discharged from the pretreatment tank and then subjected to further treatment.
[0013] Preferably, in step S4, the temperature of the carbon-containing raw material is raised to 150-300°C through the heat exchange, while the temperature of the high-temperature volatiles is reduced to 200-400°C.
[0014] Preferably, the carbon-containing raw material is washed coal.
[0015] Compared with existing technologies, this application provides a waste heat recovery and utilization system for carbon additive production, including a calcining furnace and a pretreatment component. A volatile matter conveying pipe is connected to the top of the calcining furnace, and the other end of the volatile matter conveying pipe is connected to the pretreatment component. When the calcining furnace is operating, high-temperature flue gas is introduced into the pretreatment component for heat exchange treatment. The pretreatment component includes a pretreatment tank, with a feed inlet on one side of the top and a discharge outlet on one side of the bottom. A heat exchange chamber is located inside the pretreatment tank, and carbonaceous raw materials are added to the heat exchange chamber through the feed inlet. The pretreatment tank is equipped with evenly distributed gas distribution branch pipes. One end of each branch pipe is connected to a gas distribution assembly at the bottom of the pretreatment tank, and the end of the gas distribution assembly away from the branch pipes is connected to a volatile matter conveying pipe. The other end of each branch pipe is connected to an exhaust pipe through a collection chamber. High-temperature flue gas enters the pretreatment tank through the volatile matter conveying pipe and is evenly distributed into the branch pipes by the gas distribution assembly. This allows the high-temperature flue gas to dry and pretreat the carbon-containing raw materials, greatly increasing the gas-solid contact area and uniformity, avoiding local overheating or short circuits, and enabling the high-temperature flue gas to be recovered and reused, thus avoiding the waste of heat energy from direct combustion. Attached Figure Description
[0016] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0017] Figure 1 A schematic diagram of a waste heat recovery and utilization system for carbon raiser production is provided in this application; Figure 2 This application provides an internal structural diagram of a pretreatment tank; Figure 3 A structural diagram of an air distribution component is provided in this application; In the diagram: 1. Pretreatment tank; 101. Inlet; 102. Outlet; 2. Exhaust pipe; 3. Collector; 4. Gas distribution branch pipe; 5. Ventilation pipe; 6. Gas distribution assembly; 601. Diversion chamber; 602. Guide channel; 603. Guide plate; 604. Diversion fan blade; 7. Volatile matter conveying pipe; 8. Exhaust fan; 9. Calcining furnace. Detailed Implementation
[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.
[0019] The core of this application is to provide a waste heat recovery and utilization system and method for the production of carbon raisers. This solves the problems of existing technologies that use direct combustion or indirect heat exchange to recover waste heat when treating high-temperature volatile gases generated during carbon raiser processing. Direct combustion wastes high-quality heat energy; while traditional shell-and-tube and finned heat exchangers are prone to coking and blockage when used to treat such tar-containing flue gas, resulting in rapid decline in heat exchange efficiency and high maintenance costs; at the same time, the drying and pretreatment of raw materials before entering the furnace requires an additional heat source, which increases production costs.
[0020] Figure 1 This application provides a schematic diagram of a waste heat recovery and utilization system for carbon raiser production. Figure 2 This application provides an internal structural diagram of a pretreatment tank. Figure 3 A structural diagram of an air distribution component provided in this application is shown in the attached diagram. Figures 1 to 3 As shown.
[0021] A waste heat recovery and utilization system for carbon additive production includes a calcining furnace 9 and a pretreatment component. A volatile matter conveying pipe 7 is connected to the top of the calcining furnace 9, and the other end of the volatile matter conveying pipe 7 is connected to the pretreatment component. The calcined raw materials in the calcining furnace 9 generate a large amount of high-temperature flue gas. The high-temperature flue gas mainly contains volatiles such as methane, hydrogen, and tar. The high-temperature flue gas is conveyed to the pretreatment component via the volatile matter conveying pipe 7 for recovery and utilization, transforming the high-temperature volatiles from "waste" into a "heat source" for the pretreatment process. This achieves closed-loop cascade utilization of energy within the production system, resulting in high heat utilization efficiency. Specifically, the structure and working principle of the calcining furnace 9 can be found in existing technologies. Furthermore, an induced draft fan 8 and a regulating valve are installed on the volatile matter conveying pipe 7. The flow rate and pressure of the high-temperature flue gas are controlled by the induced draft fan 8 and the regulating valve.
[0022] In the above embodiments, the pretreatment component includes a pretreatment tank 1, the interior of which is a heat exchange chamber. An inlet 101 is provided on one side of the top of the pretreatment tank 1, and an outlet 102 is provided on one side of the bottom of the pretreatment tank 1. Carbonaceous raw materials are added into the pretreatment tank 1 through the inlet 101 for preliminary heat exchange and drying. Gas distribution branch pipes 4 are evenly distributed inside the pretreatment tank 1. One end of each gas distribution branch pipe 4 is connected to a gas distribution assembly 6 at the bottom of the pretreatment tank 1, and the end of the gas distribution assembly 6 away from the gas distribution branch pipes 4 is connected to a volatile matter conveying pipe 7. High-temperature flue gas enters the pretreatment tank 1 from bottom to top for heat exchange, improving heat exchange efficiency. High-temperature volatile gases, reaching temperatures of 600-900℃, enter the gas distribution assembly 6 through the volatile matter conveying pipe 7. The gas distribution assembly 6 evenly distributes the high-temperature volatile gases into multiple gas distribution branch pipes 4. The high-temperature volatiles transfer sensible heat to the raw materials, raising their temperature. Most of the surface water and some bound water in the raw materials are rapidly evaporated and carried away, greatly increasing the gas-solid contact area and uniformity, and avoiding localized overheating or short circuits. The other end of the multiple gas distribution branch pipes 4 is connected to an exhaust pipe 2 through a collection chamber 3. The cooled volatile exhaust gas is discharged through the exhaust pipe 2 for further treatment, reducing the load on the end-of-line treatment equipment.
[0023] To improve heat exchange efficiency, preferably, the side wall of the gas distribution branch pipe 4 is also connected to a vent pipe 5, and the vent pipe 5 is inclined downward. The gas sprayed out from the vent pipe 5 has a self-cleaning effect on the pipe wall, and the downward inclination of the vent pipe 5 reduces the risk of material blockage, thus solving the problem of easy blockage in traditional heat exchangers.
[0024] In a preferred embodiment, the gas distribution assembly 6 includes a distribution chamber 601 connected to the volatile matter conveying pipe 7. A guide plate 603 is provided on the upper side of the inner wall of the distribution chamber 601. A plurality of guide grooves 602 arranged in a ring array are opened on the outer wall of the guide plate 603. The high-temperature gas entering the distribution chamber 601 can be quickly introduced into a plurality of gas distribution branch pipes 4 through the guide plate 603. Furthermore, the number of guide channels 602 is the same as that of the gas distribution branch pipes 4, and the positions of the output ends of the multiple guide channels 602 correspond to the positions of the input ends of the multiple gas distribution branch pipes 4. The high-temperature gas is quickly guided into the gas distribution branch pipes 4 through the guide channels 602. In actual installation, a diversion fan blade 604 can be connected to the tip of the guide plate 603 through a bearing, which is conducive to the rotation of the diversion fan blade 604. The diversion fan blade 604 is located directly above the output end of the volatile matter conveying pipe 7. When the high-temperature gas is output from the volatile matter conveying pipe 7, it can drive the diversion fan blade 604 to rotate, thereby evenly dispersing the high-temperature flue gas into the multiple guide channels 602, thereby improving the heat exchange efficiency and enabling the carbon-containing raw materials to be quickly dried and pretreated.
[0025] Furthermore, a conveying device is installed at the discharge port of the pretreatment tank 1. The discharge end of the conveying device is connected to the feeding port of the calcining furnace 9. The pretreated raw materials are fed into the calcining furnace 9 for further calcination processing using the conveying device. Since the material has been preheated and the moisture content has been significantly reduced, the heating time and energy input required by the calcining furnace 9 are significantly reduced, and the overall energy consumption is reduced.
[0026] In the above embodiment, the collection chamber 3 is installed through the top of the pretreatment tank 1. The volatiles after heat exchange and cooling are concentrated into the collection chamber 3 and discharged through the exhaust pipe 2.
[0027] Based on the above-mentioned waste heat recovery and utilization system for carbon raiser production, the present invention also discloses a method for waste heat recovery and utilization in carbon raiser production, comprising the following steps: S1. Add the carbon-containing raw material to the pretreatment tank 1, and place the carbon-containing raw material in the heat exchange chamber; S2. Start the calcining furnace 9 to generate high-temperature volatiles. The main components of the high-temperature volatiles are methane, hydrogen, tar, etc., and the temperature of the high-temperature volatiles is as high as 600°C or more. S3. The high-temperature volatiles are drawn out from the calcining furnace 9 and transported to the pretreatment tank 1. The induced draft fan 8 is started and the valve is adjusted to extract the high-temperature volatiles from the calcining furnace 9 and transport them to the pretreatment tank 1 through the volatiles conveying pipe 7 for heat exchange. S4. High-temperature volatiles are dispersed through the gas distribution assembly 6 and exchange heat with the carbon-containing raw materials in the pretreatment tank 1, preheating and drying the raw materials while cooling the volatiles. The distributed gas distribution system, composed of multiple gas distribution branches 4, greatly increases the gas-solid contact area and uniformity, preventing localized overheating or short circuits. The gas ejected from the vent pipe 5 has a self-cleaning effect on the pipe wall, and the downward-facing design of the vent pipe 5 reduces the risk of material blockage. S5. The preheated and dried raw materials are transported to the calcining furnace 9 for high-temperature calcination. The pretreated raw materials are added to the calcining furnace 9 for further calcination processing using a conveying device. The pretreated dry hot materials are sent into the calcining furnace 9 for high-temperature calcination through the conveying equipment. The heating time and energy input required for the calcining furnace 9 are significantly reduced, and the overall energy consumption is reduced. S6. The volatile exhaust gas, which has been cooled by heat exchange, is discharged from the pretreatment tank 1 and then further processed, realizing the direct and efficient recovery of high-temperature volatiles for preheating and deep drying of raw materials, significantly reducing the main energy consumption of the calcining furnace 9. The cooled volatile exhaust gas is discharged from the exhaust pipe 2 and enters the subsequent waste gas treatment system for treatment to achieve emission standards.
[0028] In the above embodiment, in step S4, the temperature of the carbon-containing raw material is raised to 150-300°C through heat exchange, while the temperature of the high-temperature volatiles is lowered to 200-400°C. The raw material is dried and heated, the moisture evaporates, and the cooled exhaust gas is discharged from the exhaust pipe 2.
[0029] Furthermore, in order to improve the production quality and efficiency of the products, the carbon-containing raw material is refined washed coal.
[0030] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.
[0031] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.
Claims
1. A waste heat recovery and utilization system for carbon raiser production, characterized in that, include: The calcining furnace (9) and the pretreatment assembly are provided with a volatile matter conveying pipe (7) connected to the top of the calcining furnace (9), and the other end of the volatile matter conveying pipe (7) is connected to the pretreatment assembly. The pretreatment assembly includes a pretreatment tank (1), with an inlet (101) on one side of the top of the pretreatment tank (1) and an outlet (102) on one side of the bottom of the pretreatment tank (1). Gas distribution branches (4) are evenly distributed inside the pretreatment tank (1). One end of each gas distribution branch (4) is connected to a gas distribution assembly (6) at the bottom of the pretreatment tank (1). The end of the gas distribution assembly (6) away from the gas distribution branch (4) is connected to the volatile matter conveying pipe (7). The other end of each gas distribution branch (4) is connected to an exhaust pipe (2) through a collection chamber (3).
2. The waste heat recovery and utilization system for carbon raiser production according to claim 1, characterized in that, The volatile matter conveying pipe (7) is equipped with an induced draft fan (8) and a regulating valve.
3. The waste heat recovery and utilization system for carbon raiser production according to claim 1, characterized in that, The side wall of the air distribution branch pipe (4) is also connected to a ventilation pipe (5), and the ventilation pipe (5) is inclined downward.
4. The waste heat recovery and utilization system for carbon raiser production according to claim 1, characterized in that, The gas distribution assembly (6) includes a flow distribution chamber (601) connected to the volatile matter conveying pipe (7). A flow guide plate (603) is provided on the upper side of the inner wall of the flow distribution chamber (601), and a plurality of flow guide grooves (602) arranged in a ring array are provided on the outer wall of the flow guide plate (603).
5. The waste heat recovery and utilization system for carbon raiser production according to claim 4, characterized in that, The number of the guide grooves (602) is the same as the number of the air distribution branches (4), and the positions of the output ends of the multiple guide grooves (602) correspond to the positions of the input ends of the multiple air distribution branches (4).
6. The waste heat recovery and utilization system for carbon raiser production according to claim 1, characterized in that, The pretreatment tank (1) is equipped with a conveying device at its outlet, and the outlet end of the conveying device is connected to the feeding port of the calcining furnace (9).
7. The waste heat recovery and utilization system for carbon raiser production according to claim 5, characterized in that, The collection chamber (3) is installed through the top of the pretreatment tank (1).
8. A method for recovering and utilizing waste heat from the production of carbon raiser based on the system described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Add the carbon-containing raw material to the pretreatment tank (1); S2: Start the calcining furnace (9) to generate high-temperature volatiles; S3: The high-temperature volatiles are drawn out from the calcining furnace and transported to the pretreatment tank (1). S4: High-temperature volatiles are dispersed through the gas distribution component (6) and exchange heat with the carbon-containing raw materials in the pretreatment tank (1) to preheat and dry the raw materials, while the volatiles are cooled. S5.: The preheated and dried raw materials are transported to the calcining furnace (9) for high-temperature calcination; S6: The volatile exhaust gas, which has been cooled down after heat exchange, is discharged from the pretreatment tank (1) and then further processed.
9. The method for recovering and utilizing waste heat from the production of carbon raiser according to claim 6, characterized in that, In step S4, the temperature of the carbon-containing raw material is raised to 150-300°C through the heat exchange, while the temperature of the high-temperature volatiles is reduced to 200-400°C.
10. The method for recovering and utilizing waste heat from the production of carbon raiser according to claim 6, characterized in that: The carbon-containing raw material is refined washed coal.