Combined type heat exchanger suitable for cooling high-temperature molten materials

Abstract

The invention relates to a combined type heat exchanger suitable for cooling a high-temperature molten material. A main body comprises a rack, a cylindrical outer shell, a cylindrical inner rotating drum, a motor speed reduction driving device, a spiral scraper, a cooling water channel, a cooling water inlet and outlet, a hot water channel, a hot water inlet and outlet, a material channel, a material inlet and outlet, a driving / driven bearing device and a rotating joint. The cooling water channel is fixedly arranged in the interlayer of the outer shell and is used for cooling the barrel wall, so that the near-wall molten material in contact with the cooling water channel is adhered to the inner barrel wall to generate a crystallized material layer after deep heat exchange, and the crystallized material layer is scraped off by the spiral scraper and crushed into low-temperature seed crystals which are conveniently stirred and mixed into the high-temperature molten material for diffusive uniform heat exchange; the hot water channel is fixedly arranged in the interlayer of the inner rotary drum, the wall of the drum is heated, smooth flow of materials in the channel is ensured, the high-temperature molten materials in the channel are gradually and uniformly cooled to the rated temperature of the molten materials for granulation in the spiral propelling and continuous double heat exchange processes, and the high-temperature rotary drum has very high practicability.

Description

Technical Field

[0001] This invention relates to the field of material cooling equipment, and in particular to a composite heat exchanger suitable for cooling high-temperature molten materials. Background Technology

[0002] In the petrochemical refining and petrochemical industries, a large amount of high-temperature liquid molten material byproducts are generated, such as liquid sulfur at around 135°C, liquid petroleum resin and phenolic resin at around 210°C, liquid paraffin at around 58°C, and rubber additives at around 52°C. These high-temperature liquid molten material byproducts need to be cooled and shaped into solid products that are easy to package, store, and transport before they can be utilized. Currently, this is accomplished by granulation systems, mainly using steel belt material cooling conveyors. Commonly used steel belt material cooling conveyors mainly include a frame, a main drive drum and a driven tension drum located at the front and rear ends of the frame, a steel belt carrying platform located between the left and right side frames of the frame, a closed-loop steel belt between the main drive drum and the driven tension drum, a water-cooling mechanism located below the steel belt carrying platform, a molten material feeder located above the driven tension drum, and a feeding mechanism located beside the main drive drum. During operation, the steel belt is supported by the steel belt carrying platform and is closed-loop tensioned on the main drive drum and the driven tension drum. Driven by the main drive drum and cooled by the spraying of the water cooling mechanism, the high-temperature liquid molten material continuously fed on the surface of the steel belt is transported from one end of the conveyor to the other end. During this process, the material continuously evaporates, cools, and solidifies into a solid product with a lower temperature that meets the requirements for use. Finally, it is processed by the feeding mechanism and enters the silo.

[0003] Because these high-temperature liquid molten materials are supplied by production enterprises at temperatures far above their melting points, they must be cooled to near their melting points before entering the granulation system to crystallize and granulate. However, due to the lack of suitable heat exchange and cooling facilities, traditional mixing tanks, mixing kettles, or long-distance conveying pipelines are currently the only options. These methods are not only primitive and outdated, but also have poor cooling effects and are difficult to control. Consequently, it is difficult to meet the requirements of uniform material feeding and consistent granulation results. From both a practical and economic perspective, these methods are unsatisfactory and have become a major problem of widespread concern in the industry that is difficult to solve in the short term. Summary of the Invention

[0004] The purpose of this invention is to overcome the major problem of the lack of suitable heat exchangers for cooling high-temperature molten materials. It provides a scientific and reasonable method that is simple in structure, safe and reliable in operation, has excellent cooling effect and strong applicability, and can ensure the provision of a composite heat exchanger for cooling high-temperature molten materials that meets the rated temperature requirements of normal granulation.

[0005] This invention discloses a composite heat exchanger suitable for cooling high-temperature molten materials. The main body includes: a frame; a cylindrical outer shell fixed to the frame; a motor reduction drive device with a coupling on the power output end; a cylindrical inner rotating cylinder disposed within the outer shell cavity and capable of rotating around an axis; several outwardly extending spiral scrapers fixed to the outer surface of the inner rotating cylinder; a cooling water channel formed by a jacket fixed within the outer shell wall; a hot water channel formed by a jacket fixed within the inner rotating cylinder wall; a material channel formed by the cavity between the inner surface of the outer shell wall and the outer surface of the inner rotating cylinder wall; a material inlet and outlet; a cooling water inlet and outlet; a hot water inlet and outlet; a drive bearing device and a driven bearing device that support and ensure the inner rotating cylinder's rotation around an axis; and a rotary joint that controls the inflow and outflow of hot water.

[0006] The spiral scraper is fixedly welded to the outer surface of the inner rotating cylinder, and its blade extends into the material channel. It has the functions of spirally propelling the molten material forward as the inner rotating cylinder rotates at high speed, scraping off the thin layer of crystallized material formed on the inner wall of the outer shell due to the deep cooling and crystallization of the high-temperature molten material near the barrel wall caused by the heat absorption of the low-temperature cooling water in the outer shell jacket, and crushing the scraped crystallized material and dispersing and stirring it into the high-temperature molten material in the channel as a low-temperature seed crystal, so as to carry out diffuse and uniform heat exchange. Thus, the high-temperature molten material in the channel gradually and uniformly cools down to the rated temperature of the molten material that can be granulated during the spiral propulsion and continuous heat exchange.

[0007] The material inlet and material outlet are respectively fixed on the front and rear bottoms of the outer casing;

[0008] The cooling water inlet and cooling water outlet are respectively fixed on the front and rear walls near the bottom of the outer casing;

[0009] The main bodies of the drive bearing device and the driven bearing device are respectively fixed at the center of the front and rear bottom of the outer shell and are shaft-mounted to the front and rear end shafts of the inner rotating cylinder. The driven end of the drive bearing device is assembled and connected to the coupling.

[0010] The rotary joint body is fixed on the bottom of the outer shell and is provided with a hot water inlet and a hot water outlet. It has the functions of regulating the inflow and outflow of hot water, keeping the inner cylinder wall on the outer cylinder wall so that high-temperature molten materials do not stick, and ensuring the rated temperature state for the smooth flow of materials in the channel.

[0011] During operation, the high-temperature liquid molten material is fed in through the material inlet and propelled forward by the spiral scraper. Cooling water circulates between the cooling water inlet, cooling water channel, and cooling water outlet, keeping the barrel wall at a low temperature. This allows a portion of the high-temperature molten material close to the inner barrel wall within the material channel to undergo deep heat exchange with the outer shell, generating ultra-low temperature crystals. These crystals adhere to the inner barrel wall surface, forming a thin layer of low-temperature crystals. These crystals are then scraped off and pulverized by the high-speed rotating spiral scraper and mixed into the remaining high-temperature molten material as low-temperature seed crystals for diffuse heat transfer. The heat exchange process allows the high-temperature molten material in the material channel to gradually cool down to a rated temperature suitable for granulation as it is continuously spirally propelled forward. Finally, the material is discharged through the material outlet and sent to the molten material granulation system. Under the control of the rotary joint, the hot water circulates between the hot water inlet, hot water channel, and hot water outlet, raising the temperature of the inner rotating cylinder wall and maintaining it at a rated temperature that ensures the high-temperature molten material in the material channel will not adhere to the outer cylinder wall surface due to a large temperature difference during the diffusive heat exchange process, thus affecting the uniform cooling and normal flow of the material.

[0012] Based on the above concept, this invention discloses a composite heat exchanger suitable for cooling high-temperature molten materials. Taking into account the ultracold characteristics and granulation requirements of the high-temperature molten materials, it rationally designs a composite heat exchanger with a large temperature difference, facilitating concentrated generation of low-temperature seed crystals through deep heat exchange, and ensuring thorough mixing of the low-temperature seed crystals into the high-temperature liquid molten material within the channel for diffuse and uniform heat exchange. The method of heating the inner rotating cylinder wall with hot water ensures that the high-temperature liquid molten material does not adhere to the cylinder wall during diffuse heat exchange, thus avoiding obstruction, ensuring normal material flow, improving heat exchange efficiency, and achieving the desired cooling effect. The method is scientific and reasonable, with a simple structure, safe and reliable operation, and strong operability. Located between the high-temperature liquid molten material product supply end and the granulation system inlet, it fully meets the automatic, efficient, safe, and reliable requirements of automated production lines. It effectively solves the major problem of the lack of suitable heat exchangers for cooling high-temperature molten materials, representing a significant innovation in this field with strong practicality and promising market application prospects. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the basic structure of an embodiment of the present invention.

[0014] In the picture:

[0015] 1. Frame 2. Outer casing 3. Coupling 4. Motor reduction drive 5. Inner rotating drum

[0016] 6. Spiral scraper 7. Cooling water channel 8. Hot water channel 9. Material channel 10. Material inlet

[0017] 11. Material outlet 12. Cooling water inlet 13. Cooling water outlet 14. Hot water inlet

[0018] 15. Hot water outlet 16. Drive bearing assembly 17. Driven bearing assembly 18. Rotary joint Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and typical embodiments.

[0020] exist Figure 1 This invention discloses a composite heat exchanger suitable for cooling high-temperature molten materials. The main body includes: a frame 1; a cylindrical outer shell 2 fixed to the frame 1; a motor reduction drive 4 with a coupling 3 on its power output end; a cylindrical inner rotating cylinder 5 disposed within the cavity of the outer shell 2 and capable of rotating around an axis; several outwardly extending spiral scrapers 6 fixed to the outer surface of the inner rotating cylinder 5; a cooling water channel 7 formed by a jacket fixed within the wall of the outer shell 2; a hot water channel 8 formed by a jacket fixed within the wall of the inner rotating cylinder 5; a material channel 9 formed by the cavity between the inner surface of the outer shell 2 and the outer surface of the inner rotating cylinder 5; a material inlet 10 and a material outlet 11; a cooling water inlet 12 and a cooling water outlet 13; a hot water inlet 14 and a hot water outlet 15; a drive bearing device 16 and a driven bearing device 17 that support and ensure the inner rotating cylinder 5's rotation around an axis; and a rotary joint 18 that controls the inflow and outflow of hot water.

[0021] The spiral scraper 6 is fixedly welded to the outer surface of the inner rotating cylinder 5, and its blade extends into the material channel 9. It has the functions of spirally propelling the molten material forward as the inner rotating cylinder 5 rotates at high speed, scraping off the thin layer of crystallized material formed on the inner wall of the outer shell 2 due to the deep cooling and crystallization of the high-temperature molten material near the barrel wall in the material channel 9 caused by the absorption of heat by the low-temperature cooling water in the outer shell 2, and crushing the scraped crystallized material and dispersing and stirring it into the high-temperature molten material in the channel as a low-temperature seed crystal, so as to carry out diffuse and uniform heat exchange. Thus, the high-temperature molten material in the channel gradually and uniformly cools down to the rated temperature of the molten material that can be granulated during the spiral propulsion and continuous heat exchange.

[0022] The material inlet 10 and the material outlet 11 are respectively fixed on the front and rear bottoms of the outer shell 2;

[0023] The cooling water inlet 12 and cooling water outlet 13 are respectively fixed on the front and rear walls near the bottom of the outer casing 2;

[0024] The main bodies of the drive bearing device 16 and the driven bearing device 17 are respectively fixed at the center of the front and rear bottom of the outer shell 2 and are shaft-mounted to the front and rear end shafts of the inner rotating cylinder 5. The driven end of the drive bearing device 16 is assembled and connected to the coupling 3.

[0025] The rotary joint 18 is fixed to the bottom of the outer shell 2 and is provided with the hot water inlet 14 and the hot water outlet 15. It has the functions of regulating the inlet and outlet of hot water, keeping the inner rotating cylinder 5 at the rated temperature so that the cylinder wall is not stuck to the outer cylinder wall and the material flows smoothly in the channel.

[0026] During operation, the high-temperature liquid molten material is fed in through the material inlet 10 and propelled forward by the spiral scraper 6. The cooling water circulates between the cooling water inlet 12, the cooling water channel 7, and the cooling water outlet 13, keeping the barrel wall at a low temperature. This allows the portion of the high-temperature molten material close to the inner barrel wall of the outer shell 2 within the material channel 9 to undergo deep heat exchange with the material, generating ultra-low temperature crystals. These crystals adhere to the surface of the inner barrel wall, forming a thin layer of low-temperature crystals. These crystals are then scraped off and pulverized by the high-speed rotating spiral scraper 6 and mixed into the remaining high-temperature molten material as low-temperature seed crystals for diffuse heat exchange. The hot water is continuously spiraled forward, causing the high-temperature molten material in the material channel 9 to gradually cool down to the rated temperature suitable for granulation as it is continuously spiraled forward. Finally, it is discharged through the material outlet 11 and sent to the molten material granulation system. Under the control of the rotary joint 18, the hot water circulates between the hot water inlet 14, the hot water channel 8 and the hot water outlet 15, so that the cylinder wall of the inner rotating cylinder 5 is heated and maintained at the rated temperature that ensures that the high-temperature molten material in the material channel 9 will not adhere to the outer cylinder wall surface due to a large temperature difference during the diffusive heat exchange process, thus affecting the uniform cooling and normal flow of the material.

Claims

1. A composite heat exchanger suitable for use in the cooling of high temperature molten materials, the main body comprising: The rack (1), the barrel-shaped outer shell (2) fixed on the rack (1), the motor reduction drive device (4) provided with a coupling (3) on the power output end, the cylindrical inner rotating drum (5) provided in the cavity of the outer shell (2) and having the function of being driven to rotate around the shaft, and the several outwardly extending spiral scrapers (6) fixed on the outer surface of the inner rotating drum (5), the cooling water channel (7) provided by the interlayer fixed in the barrel wall of the outer shell (2), the hot water channel (8) provided by the interlayer fixed in the drum wall of the inner rotating drum (5), the material channel (9) provided by the gap between the inner surface of the barrel wall of the outer shell (2) and the outer surface of the drum wall of the inner rotating drum (5), and the material inlet (10) and the material outlet (11), the cooling water inlet (12) and the cooling water outlet (13), the hot water inlet (14) and the hot water outlet (15), the driving bearing device (16) and the driven bearing device (17) having the functions of supporting and ensuring the driven rotating function of the inner rotating drum (5) around the shaft, and the rotary joint (18) having the function of controlling the hot water in and out, wherein: The spiral scraper (6) is fixedly welded on the outer surface of the inner rotating drum (5), the blade body thereof is arranged in the material channel (9), has the functions of spirally advancing the molten material, scraping off the thin crystallized material layer formed on the inner wall of the outer shell (2) due to the deep cooling crystallization of the high-temperature molten material near the barrel wall in the material channel (9) affected by the heat absorption of the low-temperature cooling water in the interlayer of the outer shell (2), and crushing and dispersing the scraped crystallized material into the high-temperature molten material in the channel as low-temperature crystal seeds for mixing and stirring, thereby making the high-temperature molten material in the channel gradually and uniformly cooled to the rated temperature of the molten material for granulation in the process of spirally advancing and continuously heat exchanging; The material inlet (10) and the material outlet (11) are respectively fixed on the front and rear barrel bottoms of the outer shell (2); The cooling water inlet (12) and the cooling water outlet (13) are respectively fixed on the front and rear barrel walls near the barrel bottoms of the outer shell (2); The driving bearing device (16) and the driven bearing device (17) are respectively fixed on the front and rear barrel bottom centers of the outer shell (2) and connected with the front and rear end shafts of the inner rotating drum (5), and the driven end of the driving bearing device (16) is connected with the coupling (3); The rotary joint (18) is fixed on the barrel bottom of the outer shell (2) and provided with the hot water inlet (14) and the hot water outlet (15), has the functions of adjusting and controlling the hot water in and out, keeping the drum wall of the inner rotating drum (5) at a non-sticking high-temperature molten material state on the outer drum wall, and ensuring the smooth flow of the material in the channel. In operation, the high-temperature liquid melt material is fed in through the material inlet (10) and is propelled forward by the helical screw (6), and the cooling water is circulated between the cooling water inlet (12), the cooling water channel (7) and the cooling water outlet (13) to keep the barrel wall at a low temperature, so that the high-temperature melt material in the material channel (9) close to the inner barrel wall of the shell (2) is concentrated to perform deep heat exchange with a large temperature difference, to generate low-temperature crystals, to adhere to the surface of the inner barrel wall to form a thin low-temperature crystal layer, and then to be scraped off by the high-speed rotating helical screw (6), to be crushed, and to be mixed into the remaining high-temperature melt material in the form of low-temperature seeds to perform diffusive heat exchange, so that the high-temperature melt material in the material channel (9) is gradually cooled down to a rated temperature suitable for granulation in a continuous helical propulsion process, and finally is discharged through the material outlet (11) and is sent to a melt material granulation system; the hot water is circulated between the hot water inlet (14), the hot water channel (8) and the hot water outlet (15) under the control of the rotating joint (18) to warm up the barrel wall of the inner rotating drum (5) and to keep it at a rated temperature state that can ensure that the high-temperature melt material in the material channel (9) will not adhere to the surface of the outer barrel wall due to a large temperature difference during diffusive heat exchange, which will affect the uniform cooling and normal flow of the material.

Images