Rotational flow heat exchange test device for strengthening heat exchange of slag particles in centrifugal granulation of slag

Abstract

The invention relates to the technical field of blast furnace slag dry granulation waste heat recovery, and particularly discloses a rotational flow heat exchange test device for strengthening slag centrifugal granulation slag particle heat exchange, which comprises a granulation chamber, a rotational flow countercurrent heat exchanger, a funnel, an airflow distribution ring and an air distribution device, the bottom of the granulation chamber is connected with a rotational flow countercurrent heat exchanger, and the inner side of the granulation chamber is provided with a sleeve which can rotate forwards and reversely and is provided with rotational flow pieces, so that the particle motion trail can be actively changed, and the retention time of the particles in a heat exchange area is greatly prolonged; hot air is uniformly fed from the bottom through the airflow distribution ring and forms efficient countercurrent flow heat exchange with falling slag particles. The device integrates wind speed detection, multi-point temperature monitoring (comprising an outlet thermocouple for judging the thermal stability of a system) and a precise slag receiving and temperature measuring unit, so that the quantification of the heat exchange process of a flying section of granulated particles is realized, the experiment research can be repeated, the heat exchange at the stage can be effectively enhanced, and the heat exchange efficiency is improved. And key experimental data is provided for optimization and amplification of the blast furnace slag dry granulation waste heat recovery process.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology in dry blast furnace slag granulation, and more specifically, to a swirl heat transfer test device for enhancing the heat transfer of slag particles in centrifugal slag granulation. Background Technology

[0002] The molten slag discharged during blast furnace ironmaking processes has a temperature of 1450℃-1550℃, contains abundant sensible heat resources, and is a high-grade heat source with extremely high recovery value. Dry slag granulation technology can realize the recovery of slag waste heat, effectively helping Chinese steel enterprises achieve significant energy conservation, emission reduction, and lower smelting costs. Centrifugal granulation technology has become a research hotspot in dry blast furnace slag processing. Current research on centrifugal granulation methods for blast furnace slag is relatively comprehensive, especially regarding the spreading process of molten slag on a rotary table or rotating cup and its crushing mode at the edges, which is relatively well-developed.

[0003] However, current research on granulated particles mainly focuses on processes such as particle solidification and crystallization, and waste heat recovery after collection, lacking research on the heat transfer during particle motion before the granulated particles enter the fluidized bed. Furthermore, current devices for centrifugal granulation and waste heat recovery often combine a granulation chamber with a fluidized bed for heat exchange, but the rapid particle descent speed often leads to insufficient heat exchange between the slag and air, resulting in low waste heat recovery efficiency and difficulties in resource recovery.

[0004] Several existing technologies also involve swirl technology. A search revealed Chinese patent CN118186164A, which discloses a system and method for granulating liquid blast furnace slag and recovering waste heat. This system includes a granulation device, a swirl heat exchanger, and a waste heat recovery device. This method utilizes a high-speed jet to shear the molten slag, granulating it. The granulated particles are then carried by the airflow into a swirl heat exchanger for gas-solid separation. The separated particles then enter the waste heat recovery device for further cooling. Furthermore, Chinese patent CN118186157A also discloses a system for swirl granulation and waste heat recovery of liquid blast furnace slag, the core of which is a swirl granulation heat exchanger. This system also utilizes a high-speed fluid to shear the slag flow and achieve initial heat exchange.

[0005] However, the cyclone devices in the aforementioned existing technologies primarily function to granulate molten slag, separate gas and solid phases, and pretreat for subsequent waste heat recovery devices (such as fluidized beds or moving beds). Their focus is on the connection of the entire process chain and macroscopic waste heat recovery. They are not specifically designed for the refined study and enhancement of the heat exchange process between particles and air during the specific flight stage from "after granulation" to "before entering the final collection device." These devices do not have specialized structures designed to actively and forcibly extend the particle's movement path and residence time in the pure gas phase heat exchange zone, nor do they possess the precise design for systematic, quantitative, and repeatable experimental studies of particle trajectory, heat exchange time, and efficiency during this stage. Therefore, existing technologies still have significant shortcomings in deeply understanding and optimizing this crucial aspect of heat exchange during flight.

[0006] Therefore, it is necessary to design a heat exchange experimental device based on counter-current swirl to specifically study and enhance the heat exchange process of slag particles in the flight section, and solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to solve the technical problems mentioned in the background art and to provide a cyclone heat transfer test device for enhancing the heat transfer of slag particles in centrifugal granulation of molten slag. This device can be used to specifically study the heat transfer problem of granulated slag particles during the flight stage. Through a unique structural design, it can actively slow down the falling speed of the particles, increase their contact time with the heat transfer medium, and improve the heat transfer effect, thereby improving the heat transfer efficiency of the entire centrifugal granulation system and providing accurate experimental basis for scaling up the waste heat recovery process of dry granulation.

[0008] The above-mentioned objective of the present invention is achieved as follows: One aspect of the present invention provides a swirl heat transfer test apparatus for enhancing the heat transfer of molten slag particles in centrifugal granulation, comprising: The granulation chamber is equipped with a slag discharge device at its top; The swirl countercurrent heat exchanger has its inlet coaxially connected to the bottom outlet of the granulation chamber, which is used to extend the falling path and residence time of the slag particles. A distribution device for supplying controllable hot air to the bottom of the swirling countercurrent heat exchanger; An airflow distribution ring is located in the bottom region of the swirl countercurrent heat exchanger and is connected to the air distribution device through an air inlet pipe to evenly distribute the controllable hot air into the swirl countercurrent heat exchanger. A collection and measurement unit is installed at the bottom outlet of the swirl countercurrent heat exchanger to collect and measure the temperature of the slag particles after heat exchange.

[0009] Furthermore, the air distribution device includes a hot air gun, a ball valve for adjusting the flow rate, and a tee pipe and hose connecting them.

[0010] Furthermore, the collection and measurement unit includes a funnel, a slag receiving trough located below the funnel, and a thermocouple located inside the slag receiving trough. A rubber stopper is fixed to the bottom of the funnel, and the slag receiving trough is placed on the rubber stopper.

[0011] Furthermore, the airflow distribution ring is connected to the interior of the swirl countercurrent heat exchanger through several air inlet branch pipes evenly arranged along the circumference.

[0012] Furthermore, the intake manifold is equipped with a wind speed detector for monitoring airflow.

[0013] Furthermore, the granulation chamber is equipped with a rotating cup, and a speed-regulating motor is installed at the bottom center of the rotating cup.

[0014] Furthermore, the side wall of the granulation chamber is provided with an annular air outlet for discharging the air after heat exchange.

[0015] Furthermore, a thermocouple is provided at the annular air outlet.

[0016] Furthermore, the inner side of the swirling countercurrent heat exchanger is provided with a sleeve with swirling vanes, and the sleeve can rotate in both directions.

[0017] The present invention also provides a method for using a swirl heat transfer test device to enhance the heat transfer of molten slag particles in centrifugal granulation, comprising the following steps: S1. The predetermined hot air is delivered through the air distribution device, and the wind speed is recorded by the wind speed detector installed on the air intake main pipe to determine whether the required air volume is reached; the hot air enters the airflow distribution ring through the air intake main pipe and is evenly sent into the swirl counterflow heat exchanger through the air intake branch pipe. S2. Observe the temperature change at the annular air outlet on the side wall of the granulation chamber. After the temperature stabilizes, turn on the speed-regulating motor in the granulation chamber to drive the rotating cup to rotate evenly. S3. The slag particles are evenly poured in from the top slag discharge device. The slag particles fall onto the rotating cup and fly out under the action of centrifugal force and fall into the vortex countercurrent heat exchanger to move and exchange heat with the hot air from bottom to top. The air after heat exchange is discharged from the top annular air outlet, and the slag particles fall into the collection and measurement unit. S4. The temperature change of the slag particles is recorded by the thermocouple in the collection and measurement unit, and the heat exchange efficiency is calculated.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention pioneers a dedicated research method for heat exchange during the flight phase. Due to the lack of a dedicated research device for heat exchange of granulated particles during the "flight phase" in existing technologies, the present invention designs a swirling countercurrent heat exchanger with multiple folded channels to actively and forcibly change the falling trajectory of slag particles, maximizing their path and extending their residence time within a limited space. This, combined with the controllable and uniform hot air introduced from the bottom up, forms an efficient countercurrent heat exchange, thereby achieving for the first time a quantitative and repeatable experimental study of the key process of "flight heat exchange," filling the gap in existing technologies at this research level.

[0019] 2. The design of this invention introduces a core functional component called a "swirling countercurrent heat exchanger," which actively and forcibly alters the behavior of particles and airflow through a specific multi-fold channel structure: for particles, it transforms them from "free fall" to "controlled swirling and reversing motion," maximizing the path within a limited space and significantly increasing the heat exchange time; for airflow, a stable, bottom-up countercurrent field is constructed through a uniform bottom air distribution system, forming an optimal heat exchange temperature difference and contact mode with the falling particles, greatly enhancing the heat exchange intensity.

[0020] 3. The device of the present invention is equipped with a thermocouple at the annular air outlet to determine the thermal stability of the system. Combined with the wind speed detector in the air inlet pipe and the precision temperature measurement in the slag collection tank, the accuracy, validity and repeatability of the experimental data are ensured. This design elevates the entire device from a simple heat exchange container or intermediate process link to a precision scientific instrument that can be used for in-depth mechanism research and parameter optimization.

[0021] 4. Through the device of this invention, the effects of various variables such as wind temperature, air volume, particle size, flow rate and swirl intensity on the heat exchange efficiency of the flight section can be systematically studied, thereby obtaining the optimal combination of process parameters. These direct and accurate experimental data provide an indispensable scientific basis for the design, scale-up and operation control of industrial-grade dry granulation waste heat recovery systems, and help to fundamentally improve the waste heat recovery efficiency of the entire system. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the device in an embodiment of the present invention; Figure 2 This is a partial structural diagram of the device in an embodiment of the present invention; Figure 3 This is a top view (from one angle) of the device in an embodiment of the present invention. Figure 4 This is a top view (another angle) of the device in an embodiment of the present invention; Figure 5This is a top view of the swirl vane sleeve in one embodiment of the present invention. Figure 6 This is a top view of the swirl vane sleeve in an embodiment of the present invention (another state). Figure 7 This is a front view schematic diagram of the swirl vane sleeve in an embodiment of the present invention; Figure 8 This describes the changes in the average outlet temperature and heat exchange of particles under different hot air flow rates in Experiment Example 1 of this invention. Figure 9 This describes the changes in the average outlet temperature and heat exchange of particles under different slag flow rates in Experiment Example 2 of this invention.

[0023] Reference numerals used in the above figures: 1. Granulation chamber; 2. Swirl countercurrent heat exchanger; 3. Funnel; 4. Base; 5. Airflow distribution ring; 6. Inlet main pipe; 7. Air distribution device; 711-713. Hose; 714. T-pipe; 715. Ball valve; 716. Hot air gun; 8. Annular air outlet; 9. Rotary cup; 10. Speed-regulating motor; 11. Rubber plug; 12. Slag receiving trough; 131. Thermocouple 1; 132. Thermocouple 2; 14. Inlet branch pipe; 15. Wind speed detector; 161-164. Sealing rubber gasket; 17. Slag discharge device; 18. Sleeve with swirl vanes. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] This invention provides a swirl heat transfer test device for enhancing the heat transfer of molten slag particles in centrifugal granulation, such as... Figures 1-2As shown, the device includes a granulation chamber 1, a slag discharge device 17, a swirl countercurrent heat exchanger 2, a funnel 3, a base 4, an airflow distribution ring 5, and an air distribution device 7. The slag discharge device 17 is installed at the top center of the granulation chamber 1, and the bottom of the granulation chamber 1 is coaxially connected to the swirl countercurrent heat exchanger 2. The bottom of the swirl countercurrent heat exchanger 2 is fixedly connected to the funnel 3 and the base 4 in sequence. The outer side of the funnel 3 is fixedly connected to the inner side of the airflow distribution ring 5 horizontally via several air inlet branch pipes 14. An air inlet main pipe is provided horizontally on the outer side of the airflow distribution ring 5. 6. The end of the intake main pipe 6 is connected to the air distribution device 7. A wind speed detector 15 is installed vertically on the intake main pipe 6. The air distribution device 7 includes a three-way pipe 714, a ball valve 715, and a hot air gun 716. The left side of the three-way pipe 714 is connected to the right end of the hose 711, the right side of the three-way pipe 714 is connected to the left end of the hose 712, the upper end of the three-way pipe 714 is connected to the lower end of the hose 713, the upper end of the hose 713 is connected to the hot air gun 716, the right end of the hose 712 is connected to the ball valve 715, and the left end of the hose 711 is connected to the end of the intake main pipe 6. A rubber plug 11 is fixed to the bottom of the funnel 3. A slag collection trough 12 is placed directly above the rubber plug 11, and a thermocouple 131 is installed on the inner wall of the slag collection trough 12.

[0028] In this embodiment, a rotating cup 9 is also installed in the center of the granulation chamber 1, and a speed-regulating motor 10 is installed at the bottom center of the rotating cup 9 so that the slag particles are evenly distributed in the swirl countercurrent heat exchanger 2.

[0029] Secondly, several air inlet branch pipes 14 connected to the funnel 3 and the air distribution ring 5 are evenly arranged in the circumferential direction, and several air inlet main pipes 6 and air distribution device 7 are evenly arranged in the circumferential direction on the outer side of the air distribution ring 5, which can evenly distribute hot air to the swirl countercurrent heat exchanger 2, so that it can fully exchange heat with the falling slag particles.

[0030] Furthermore, the wind speed detector 15 is installed in the middle of the air intake pipe 6, where the airflow distribution is relatively stable and the measured data is relatively accurate.

[0031] An annular air outlet 8 is designed on the side of the granulation chamber 1 to discharge the air that has exchanged heat with the slag particles. A thermocouple 2 132 is installed at the annular air outlet 8, and the stability of the device is determined by observing the temperature change of thermocouple 2 132 at this location.

[0032] When the granulation chamber 1, the swirl countercurrent heat exchanger 2, and the funnel 3 are connected, sealing rubber gaskets 161-164 need to be placed to ensure good airtightness of the heat exchange device.

[0033] The sleeve 18 with swirl vanes inside the swirl countercurrent heat exchanger 2 can rotate in both directions, which can prolong the residence time of particles and thus enhance the heat exchange effect.

[0034] An opening is designed in the center of the rubber plug 11 that holds the slag receiving trough 12. A certain amount of water at room temperature is placed in the slag receiving trough 12. The purpose of the opening in the rubber plug 11 is to facilitate the passage of the wire of thermocouple 131. The presence of a certain amount of water is because the surface temperature of the slag particles cannot well reflect the heat exchange situation. Therefore, the slag and water can exchange heat, and the water temperature change can be measured in order to accurately obtain the slag temperature change.

[0035] The specific working process of the device of the present invention is as follows: 1. A predetermined amount of hot air is delivered by the air distribution device 7, and the wind speed is recorded by the wind speed detector 15 installed in the middle section of the air intake main pipe 6 to determine whether the required air volume has been reached. The hot air enters the airflow distribution ring 5 through the air intake main pipe 6, and finally is evenly delivered into the heat exchange device through the air intake branch pipe 14 between the funnel 3 and the airflow distribution ring 5.

[0036] 2. Record the temperature change by observing the thermocouple 132 installed at the air annular outlet 8. After the temperature stabilizes, turn on the speed-regulating motor 10 in the granulation chamber 1 to make the rotating cup 9 rotate evenly.

[0037] 3. At this point, the slag particles are evenly poured in through the top slag discharge device 17. The slag particles fall onto the rotating cup 9. Relying on the centrifugal force generated by the rotation of the rotating cup 9, the slag particles fly out at a uniform linear velocity with the rotating cup 9. Then, under the action of gravity and inertia, they fall into the swirl countercurrent heat exchanger 2 and fly, exchanging heat with the hot air. The air after heat exchange with the slag particles is discharged through the top annular air outlet 8. The slag particles that have exchanged heat with the air enter the funnel 3 under the action of gravity and particle inertia, and finally fall into the slag receiving trough 12 placed in the funnel 3. During this process, the entire particle flight and heat exchange time is recorded.

[0038] 4. Finally, the temperature change is transmitted and recorded by thermocouple 131 inside the slag receiving tank 12. The heat exchange efficiency of the whole system is calculated. The optimal conditions for heat exchange of slag particles can also be obtained by changing experimental conditions such as different air temperatures and slag particle sizes.

[0039] The working principle of a cyclone heat transfer test device for enhancing heat transfer of molten slag particles in centrifugal granulation of molten slag according to an embodiment of the present invention is as follows: This swirl heat exchanger employs a reverse cold-state heat exchange test method. During the test, hot air is introduced from the bottom of the heat exchanger to heat the room-temperature slag particles falling from the rotating cup 9 inside the heat exchanger. The slag particles continuously move within the swirl counter-current heat exchanger 2 and exchange heat with the hot air. The heated slag particles eventually fall into the slag collection trough 12 for collection, while the air after heat exchange with the slag particles is discharged from the top annular air outlet 8. By measuring the temperature change of the slag particles before and after heat exchange, the heat exchange effect of the entire heat exchanger can be determined. The design of the swirl counter-current heat exchanger, through a specific multi-fold channel structure, actively and forcibly alters the behavior of particles and airflow: for the particles, it transforms their "free fall" into "controlled swirling and reversing motion," maximizing the path within a limited space and significantly increasing the heat exchange time; for the airflow, a stable, bottom-up counter-current field is constructed through the uniform air distribution system at the bottom, forming an optimal heat exchange temperature difference and contact mode with the falling particles, greatly enhancing the heat exchange intensity.

[0040] The following are experiments conducted on embodiments of the present invention: Experimental Example 1: Blast furnace slag particles obtained from a group of hot granulation experiments in... Figure 1 The slag particle flight heat transfer experimental device shown was used for a cold-state experiment, specifically: Experimental conditions: Figure 1 Inside the swirl heat transfer test apparatus shown, the temperature is maintained at 84℃ by the air distribution device 7, and the inlet air volume is 38m³. 3 Hot air at a rate of / h enters the heat exchanger through the airflow distribution ring 5. The wind speed is measured by the wind speed detector 15 installed above the air inlet pipe 6. The temperature change of the annular air outlet 8 is observed. When the temperature stops changing, the temperature of the annular air outlet 8 is 45℃. After the airflow stabilizes, the speed-regulating motor 10 installed in the granulation chamber 1 is turned on, so that the rotating cup 9 rotates at 2100RPM. Slag particles with a flow rate of 0.48 kg / min and a particle size of 0.6-0.88 mm are evenly poured into the granulation chamber 1 through the slag discharge device 18 at the top. The slag particles fall onto the rotating cup 9 and are ejected uniformly by the centrifugal force generated by the rotation of the cup 9 and the linear velocity of the cup 9. Then, under the action of gravity and inertia, they fall into the swirl countercurrent heat exchanger 2 and fly, continuously exchanging heat with the hot air fed into the device. The air after heat exchange with the slag particles is discharged through the pre-reserved annular air outlet 8 at the top. The slag particles that have exchanged heat with the air pass through the funnel 3 under the action of gravity and inertia and finally fall into the slag receiving trough 12 placed in the funnel 3. The time from when the slag particles fall into the rotating cup to when they fall into the slag receiving trough 12 is recorded throughout the process, thus determining the particle flight time. Thermocouple 131 on the inner wall of the slag receiving trough 12 transmits and records the temperature changes of the slag particles.

[0041] The heat exchange and falling time of the slag particles in this Experimental Example 1 were tested according to the method of the above technical solution. The test results showed that the temperature of the slag particles in Experimental Example 1 of the present invention increased from 27°C to 48°C. Compared with the particle flight time without a swirling heat exchange device, the present invention can slow down the falling speed of the slag particles, prolong the movement path and residence time of the particles, and enhance the particle heat exchange efficiency. Figure 8 Under the method of Experimental Example 1, the effects of different hot air flow rates (26, 32, 38, 44 m³ / min) on a slag flow rate of 0.48 kg / min were investigated. 3 At / h), slag particles are Figure 1 The heat exchange changes within the swirling countercurrent heat exchange test device shown can be seen as the particle temperature and heat exchange volume increase with the increase of hot air flow rate.

[0042] Experimental Example 2: Experimental conditions: In Figure 1 Inside the swirl heat transfer test apparatus shown, the temperature is maintained at 86℃ by the air distribution device 7, and the inlet air volume is 38m³. 3 Hot air at a rate of / h enters the heat exchanger through the airflow distribution ring 5. The wind speed is measured by the wind speed detector 15 installed above the air inlet pipe 6. The temperature change of the annular air outlet 8 is observed. When the temperature stops changing, the temperature of the annular air outlet 8 is 46℃. After the airflow stabilizes, the speed-regulating motor 10 installed in the granulation chamber 1 is turned on, so that the rotating cup 9 rotates at 2100RPM. Slag particles with a flow rate of 0.36 kg / min and a particle size of 0.6-0.88 mm are evenly poured into the granulation chamber 1 through the slag discharge device 18 at the top. The slag particles fall onto the rotating cup 9 and are ejected uniformly by the centrifugal force generated by the rotation of the cup 9 and the linear velocity of the cup 9. Then, under the action of gravity and inertia, they fall into the swirl countercurrent heat exchanger 2 and fly, continuously exchanging heat with the hot air fed into the device. The air after heat exchange with the slag particles is discharged through the pre-reserved annular air outlet 8 at the top. The slag particles that have exchanged heat with the air pass through the funnel 3 under the action of gravity and inertia and finally fall into the slag receiving trough 12 placed in the funnel 3. The time from when the slag particles fall into the rotating cup to when they fall into the slag receiving trough 12 is recorded throughout the process, thus determining the particle flight time. Thermocouple 131 on the inner wall of the slag receiving trough 12 transmits and records the temperature changes of the slag particles.

[0043] The heat exchange and falling time of the slag particles in Experiment Example 2 of the present invention were tested according to the method of the above technical solution. The test results showed that the temperature of the slag particles in Experiment Example 2 of the present invention increased from 27°C to 52°C. Compared with the particle flight time without a swirling heat exchange device, the present invention can slow down the falling speed of the slag particles, prolong the movement path and residence time of the particles, and enhance the heat exchange efficiency of the particles. Figure 9 Under the method of Experimental Example 2, the hot air flow rate of 38 m³ / h was investigated. 3 / h, under different slag flow rates (0.24, 0.36, 0.48, 0.6 kg / min), the slag particles in Figure 1 The heat exchange changes in the swirl countercurrent heat exchange test device shown can be seen as follows: as the slag flow rate increases, the particle temperature decreases, while the heat exchange capacity increases accordingly.

[0044] Through the above-described embodiments and experimental examples of this invention, the solution addresses the technical challenges of short heat exchange time and low efficiency during the "flight phase" of slag particles after centrifugal granulation and before entering the final collection device by designing the core functional component, the swirl countercurrent heat exchanger 2. Specifically, by coaxially installing the swirl countercurrent heat exchanger 2 with a reversible swirl vane sleeve 18 below the granulation chamber 1, and combining it with a uniform countercurrent air supply system at the bottom consisting of an airflow distribution ring 5 and an air distribution device 7, the "free fall" motion of the particles is actively transformed into "controlled swirling and reversing motion," thereby significantly extending the particle movement path and gas-solid contact time within a limited space. Data from the embodiments show that this device can significantly extend the particle flight time and significantly increase the outlet temperature (e.g., the particle temperature rose from 27°C to 48°C in Experiment 1), enabling quantifiable and repeatable precise experimental research on the flight heat exchange process, and providing direct evidence for optimizing the waste heat recovery process of dry granulation.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cyclone heat transfer test device for enhancing the heat transfer of molten slag particles in centrifugal granulation, characterized in that, include: Granulation chamber (1), with a slag discharge device (17) at its top; The swirl countercurrent heat exchanger (2) has its inlet coaxially connected to the bottom outlet of the granulation chamber (1) to extend the falling path and residence time of the slag particles; Air distribution device (7) is used to provide controllable hot air to the bottom of the swirling countercurrent heat exchanger (2); An airflow distribution ring (5) is set in the bottom area of ​​the swirl countercurrent heat exchanger (2), and is connected to the air distribution device (7) through an air inlet pipe (6) to distribute the controllable hot air evenly into the swirl countercurrent heat exchanger (2). A collection and measurement unit is set at the bottom outlet of the swirl countercurrent heat exchanger (2) to collect and measure the temperature of the slag particles after heat exchange.

2. The cyclone heat transfer test device for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 1, characterized in that, The air distribution device (7) includes a hot air gun (716), a ball valve (715) for adjusting the flow rate, and a tee pipe (714) and a hose (711-713) connecting them.

3. The swirl heat transfer test device for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 1, characterized in that, The collection and measurement unit includes a funnel (3), a slag receiving trough (12) located below the funnel (3), and a thermocouple (131) located in the slag receiving trough (12). A rubber stopper (11) is fixed to the bottom of the funnel (3), and the slag receiving groove (12) is placed on the rubber stopper (11).

4. The swirl heat transfer test device for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 1, characterized in that, The airflow distribution ring (5) is connected to the interior of the swirl countercurrent heat exchanger (2) through several air inlet branch pipes (14) evenly arranged along the circumference.

5. The swirl heat transfer test device for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 1, characterized in that, The intake manifold (6) is equipped with a wind speed detector (15) for monitoring air volume.

6. The swirl heat transfer test apparatus for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 1, characterized in that, The granulation chamber (1) is equipped with a rotating cup (9), and a speed-regulating motor (10) is installed at the bottom center of the rotating cup (9).

7. The swirl heat transfer test apparatus for enhancing the heat transfer of centrifugally granulated slag particles according to claim 1, characterized in that, The side wall of the granulation chamber (1) is provided with an annular air outlet (8) for discharging the air after heat exchange.

8. The cyclone heat transfer test device for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 8, characterized in that, Thermocouple 2 (132) is provided at the annular air outlet (8).

9. The cyclone heat transfer test device for enhancing the heat transfer of molten slag particles by centrifugal granulation of slag as described in claim 1, characterized in that, The inner side of the swirling countercurrent heat exchanger (2) is provided with a sleeve (18) with swirling vanes, and the sleeve (18) can rotate in both directions.

10. A method of using a swirl heat transfer test apparatus for enhancing molten slag centrifugal granulation slag particle heat transfer as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. The predetermined hot air is delivered through the air distribution device (7), and the wind speed is recorded by the wind speed detector (15) installed on the air intake pipe (6) to determine whether the required air volume is reached; the hot air enters the air distribution ring (5) through the air intake pipe (6) and is evenly sent into the swirl countercurrent heat exchanger (2) through the air intake branch pipe (14). S2. Observe the temperature change at the annular air outlet (8) on the side wall of the granulation chamber (1). After the temperature stabilizes, turn on the speed-regulating motor (10) in the granulation chamber (1) to drive the rotating cup (9) to rotate evenly. S3. The slag particles are evenly poured in from the top slag discharge device (17). The slag particles fall onto the rotating cup (9), fly out under the action of centrifugal force and fall into the swirling countercurrent heat exchanger (2) to move and exchange heat with the hot air from bottom to top. The air after heat exchange is discharged from the top annular air outlet (8), and the slag particles fall into the collection and measurement unit. S4. The temperature change of slag particles is recorded by thermocouple 1 (131) in the collection and measurement unit, and the heat exchange efficiency is calculated.

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