A cast molding cooling waste heat recycling system

Abstract

The utility model discloses a cast forming cooling waste heat recycling system, including heat source collection module, heat transfer and transmission device and drying room, its characterized is that heat transfer and transmission device includes two stage heat exchange: one -level air -water plate type heat exchange device and two -level heat source promotion device, one -level air -water plate type heat exchange device and two -level heat source promotion device are connected with drying room respectively, the bottom of drying room is by the air inlet panel and drying room box body constitute air inlet bin, is equipped with air inlet pipe in air inlet bin, and the top of drying room is equipped with inverted V type deflector. Realized the efficient recycling of cooling waste heat in the casting process, and the originally wasted heat energy is used for sand drying, and the energy consumption is reduced significantly, and the overall system structure is reasonable, and the operation is stable, and the maintenance is convenient.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a system for recovering and utilizing residual heat from casting and molding cooling, which is used to recover the heat emitted by large castings during sand casting and molding, and to effectively utilize it in the preheating and drying process of the next batch of sand molds. Background Technology

[0002] In traditional casting processes, the cooling process of large castings after being poured into sand molds releases a significant amount of heat. This heat is typically dissipated directly into the environment through natural convection or forced ventilation, resulting in substantial energy waste. Furthermore, a large amount of heat remains in the production workshop, creating a harsh working environment and negatively impacting the physical and mental health of workers. Additionally, the newly prepared sand molds require preheating and drying during the casting process, which consumes further energy. Currently, there is no effective system solution in the technology to utilize the residual heat from the casting cooling for sand mold preheating. Summary of the Invention

[0003] The purpose of this utility model is to solve the above-mentioned technical problems and provide a casting molding cooling waste heat recovery and utilization system that can effectively recover and utilize casting cooling waste heat, reduce energy consumption, and improve production efficiency.

[0004] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a casting molding cooling waste heat recovery and utilization system, including a heat source acquisition module, a heat transfer and transmission device and a drying room, characterized in that the heat transfer and transmission device includes two-stage heat exchange: a primary air-water plate heat exchange device and a secondary heat source lifting device; the primary air-water plate heat exchange device and the secondary heat source lifting device are respectively connected to the drying room; the bottom of the drying room is an air inlet chamber composed of an air inlet plate and a drying room box, an air inlet pipe is provided in the air inlet chamber, and an inverted V-shaped guide plate is provided on the top of the drying room.

[0005] In the aforementioned casting molding cooling waste heat recovery and utilization system, preferably, the heat transfer and transmission device is equipped with a hot water storage tank, and the primary air-water plate heat exchanger includes a heat exchange plate group, an air inlet, an air outlet, a water inlet pipe and a water outlet pipe. The air inlet is connected to the heat source acquisition module, and the water outlet pipe is connected to the hot water storage tank. The air outlet is connected to the drying room via a drying device and an insulation pipe.

[0006] In the aforementioned casting and molding cooling waste heat recovery and utilization system, preferably, the secondary heat source lifting device includes a metal coil, a heat exchange fan, and an insulated pipe for transporting the hot air obtained from the hot water storage tank to the drying room.

[0007] In the aforementioned casting and molding cooling waste heat recovery and utilization system, preferably, one end of the metal coil is connected to the outlet of the hot water storage tank, and the other end is connected back to the return outlet of the hot water storage tank to form a circulation; the heat exchange fan is facing the direction of the metal coil; one side of the metal coil is provided with an air inlet window, and the other side is provided with an air outlet, and the air outlet is connected to the insulation pipe.

[0008] In the aforementioned casting molding cooling waste heat recovery and utilization system, preferably, the heat source acquisition module is provided with a casting cooling box, and a heat pipe array is provided on the inner wall of the casting cooling box; a sealed exhaust hood is provided on the top of the casting cooling box, and the exhaust hood is connected to a heat transfer and transmission device.

[0009] In the aforementioned casting molding cooling waste heat recovery and utilization system, preferably, the heat transfer and transmission device further includes a heat transfer pipe, on which a cyclone dust collector and an induced draft fan are provided.

[0010] In the aforementioned casting and molding cooling waste heat recovery and utilization system, preferably, the bottom of the casting cooling box is provided with steel rails, and a mobile vehicle is equipped with the steel rails, with the casting and sand box fixed on the mobile vehicle.

[0011] In the aforementioned casting molding cooling waste heat recovery and utilization system, preferably, the secondary heat source lifting device is also equipped with an auxiliary hot air fan.

[0012] In the aforementioned casting and molding cooling waste heat recovery and utilization system, preferably, the drying room is equipped with a gas emergency heating system.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. It achieves efficient recovery and utilization of cooling waste heat during the casting process, using the originally wasted heat energy for sand mold drying, significantly reducing energy consumption.

[0014] 2. The adoption of a two-stage heat exchange system improves the efficiency of thermal energy utilization.

[0015] 3. The special structural design of the drying room ensures uniform distribution of hot air and improves the drying effect.

[0016] 4. The system is equipped with an emergency reheating device to ensure continuous production.

[0017] 5. The mobile design facilitates the loading and unloading of castings and the collection of heat sources.

[0018] 6. The overall system structure is reasonable, the operation is stable, and the maintenance is convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a device arrangement according to the present invention.

[0020] Figure 2 This is a system diagram of a heat source acquisition and application according to this utility model.

[0021] Figure 3 This is a partial structural diagram of the heat transfer and transmission device of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of a drying room according to this utility model.

[0023] In the diagram: 1-Heat source acquisition module, 2-Cyclone dust collector, 3-Exhaust fan, 4-Secondary heat source lifting device, 401-Metal coil, 402-Heat exchange fan, 5-Primary air-water plate heat exchanger, 6-Drying room, 601-Air inlet chamber, 602-Air distribution plate, 603-Air inlet pipe, 604-Inverted V-shaped guide plate, 7-Rotating mechanism, 8-Chair legs, 9-Hot water storage tank. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through embodiments and with reference to the accompanying drawings.

[0025] This embodiment describes a waste heat recovery and utilization system for casting and molding cooling, such as... Figure 1 As shown, the entire system includes a heat source acquisition module 1, a heat transfer and transmission device, and a drying room 6.

[0026] The transfer and transmission device includes two stages of heat exchange: a primary air-water plate heat exchanger 5 and a secondary heat source lifting device 4. The primary air-water plate heat exchanger 5 and the secondary heat source lifting device 4 are respectively connected to the drying room 6.

[0027] The heat source acquisition module 1 includes a cast cooling box with a heat pipe array on the inner wall to enhance heat exchange efficiency. A sealed exhaust hood is installed on the top of the box to collect hot air. A steel rail is installed at the bottom of the box, allowing the mobile cart 7 to move along it. The casting 8 and sand box are fixed to the mobile cart 7 for easy loading and unloading.

[0028] The heat transfer and transmission device includes a hot water storage tank 9. The primary air-water plate heat exchanger 5 and the secondary heat source lifting device 4 are integrated in practical applications to reduce heat loss, such as... Figure 3 As shown, the primary air-water plate heat exchanger 5 includes a heat exchange plate assembly, an air inlet, an air outlet, a water inlet pipe, and a water outlet pipe. High-temperature gas enters through the air inlet and exchanges heat with the cold water in the plate assembly. The cold water then becomes hot water and enters the hot water storage tank 9. The cooled gas is dried and then flows to the drying chamber 6.

[0029] The secondary heat source boosting device 4 includes a metal coil 401, a heat exchange fan 402, and an insulation pipe. Specifically, one end of the metal coil 401 is connected to the outlet of the hot water storage tank 9, and the other end is connected back to the return outlet of the hot water storage tank 9 to form a circulation. The heat exchange fan 402 faces the metal coil 401. One side of the metal coil 401 has an air inlet, and the other side has an air outlet. The air inlet is connected to the exhaust port of the induced draft fan, and the air outlet is connected to the insulation pipe. Hot water in the hot water storage tank 9 circulates through the metal coil 401. The heat exchange fan 402 blows air across the metal coil 401, heats it, and then sends it to the drying room 6 through the insulation pipe. The device also includes an auxiliary hot air blower, which is integrated with the heat exchange fan 402 to supplement the heat source when heat is insufficient.

[0030] In particular, the hot water storage tank 9 of this system can be connected to other hot water pipelines required by the enterprise, and can be used for other purposes of the enterprise without pre-drying in the pre-sand box and deep dehydration.

[0031] Drying room 6 Figure 4 As shown, its bottom is an air inlet chamber 601 consisting of an air inlet plate 602 and a drying chamber box. An air inlet pipe 602 assembly is installed inside the air inlet chamber 601. The top plate of the air inlet chamber 601 is an air distribution plate 602, which is a stainless steel plate with a perforation rate of 30%. The top of the drying chamber 6 is equipped with an inverted V-shaped guide plate 604, which can promote the discharge of humid air.

[0032] In addition, drying room 6 is also equipped with a gas emergency heating system to ensure normal operation when residual heat is insufficient.

[0033] Working principle and process, such as Figure 2 As shown: After casting, the mobile vehicle 7 carries the casting 8 into the cooling box of the heat source acquisition module 1. The heat dissipated by the cooling of the casting 8 is absorbed by the heat pipe array, and the 80-120℃ hot and humid air is collected by the exhaust hood. The high-temperature gas is purified by the cyclone dust collector 2 and then transported by the induced draft fan 3. When the high-temperature gas enters the primary air-water plate heat exchanger 5, the heated cold water is stored in the hot water storage tank 9. The hot air obtained at this time is directly sent to the drying room 6 to dehumidify the new sand mold at a low temperature of 40-60℃ (to avoid surface hardening). The hot water in the hot water storage tank 9 circulates through the metal coil of the secondary heat source lifting device 4, and after heating the air, it is used for secondary drying of the sand box in the drying room 6. The secondary heat source lifting device 4 can raise the temperature of the 60℃ hot water to 80-95℃, which can be used for high-temperature drying (deep dehydration) at 85℃. The insulation pipes of this device are insulated with polyurethane foam, and the heat loss is <5%. The air distribution plate 602 and the inverted V-shaped guide plate 604 inside the drying chamber 6 ensure uniform distribution of hot air and effectively dry the sand mold. When the residual heat is insufficient, the auxiliary hot air blower or the gas emergency heating system is activated.

[0034] Implementation benefit analysis: Energy consumption comparison: Traditional electric drying: 0.8-1.2 kWh / kg water, gas is more expensive; This system: 0.15-0.3 kWh / kg water.

[0035] Shorter drying cycle: Sand mold moisture content changes from 8% to 2%: 6 hours in the traditional method; 4.5 hours in this example.

[0036] In addition, this device is a one-time investment that can be used for a long time. Based on the applicant's production capacity, the investment payback period is about two and a half years.

[0037] This system achieves tiered utilization of waste heat from casting cooling. The first-stage heat exchange generates hot water for storage, which not only produces the heat needed for pre-drying but also provides the enterprise with a suitable amount of hot water. The second-stage heat exchange increases the hot air temperature, maximizing heat recovery efficiency in conjunction with direct hot air utilization. The specially designed drying chamber structure ensures uniform and stable drying results. The entire system exhibits significant energy savings, reducing sand mold drying energy consumption by more than 40%.

[0038] The above embodiments are illustrative of the present invention and not intended to limit it. Although the present invention has been described in conjunction with preferred embodiments, it should be understood that the present invention is not limited to the preferred embodiments. Those skilled in the art can make various equivalent modifications and substitutions to the technical solutions of the present invention based on its teachings. Therefore, the scope of the present invention should be defined by the claims, and all such equivalent modifications and substitutions fall within the protection scope of the present invention.

Claims

1. A system for recovering and utilizing waste heat from casting and molding cooling, comprising a heat source acquisition module (1), a heat transfer and transmission device, and a drying chamber (6), characterized in that: The heat transfer and transmission device includes two-stage heat exchange: a primary air-water plate heat exchange device (5) and a secondary heat source lifting device (4); the primary air-water plate heat exchange device and the secondary heat source lifting device are respectively connected to the drying room; the bottom of the drying room is an air inlet chamber (601) composed of an air inlet plate (602) and a drying room box, and an air inlet pipe (603) is provided in the air inlet chamber, and an inverted V-shaped guide plate (604) is provided on the top of the drying room.

2. The casting and molding cooling waste heat recovery and utilization system according to claim 1, characterized in that, The heat transfer and transmission device is equipped with a hot water storage tank (9), and the primary air-water plate heat exchange device (5) includes a heat exchange plate group, an air inlet, an air outlet, a water inlet pipe and a water outlet pipe. The air inlet is connected to the heat source acquisition module (1), and the water outlet pipe is connected to the hot water storage tank. The air outlet is connected to the drying room (6) via a drying device and an insulation pipe.

3. The casting and molding cooling waste heat recovery and utilization system according to claim 2, characterized in that, The secondary heat source lifting device (4) includes a metal coil (401), a heat exchange fan (402), and an insulation pipe for transporting the hot air obtained from the hot water storage tank to the drying room (6).

4. The casting and molding cooling waste heat recovery and utilization system according to claim 3, characterized in that, One end of the metal coil is connected to the outlet of the hot water storage tank, and the other end is connected back to the return outlet of the hot water storage tank to form a circulation; the heat exchange fan is facing the direction of the metal coil; one side of the metal coil is provided with an air inlet window, and the other side is provided with an air outlet, which is connected to the insulation pipe.

5. The casting and molding cooling waste heat recovery and utilization system according to claim 1, characterized in that, The heat source acquisition module (1) is equipped with a casting cooling box, and a heat pipe array is provided on the inner wall of the casting cooling box; a sealed exhaust hood is provided on the top of the casting cooling box, and the exhaust hood is connected to a heat transfer and transmission device.

6. A casting molding cooling waste heat recovery and utilization system according to claim 1 or 5, characterized in that, The heat transfer and transmission device also includes a heat transfer pipe, on which a cyclone dust collector (2) and an induced draft fan (3) are provided.

7. A casting molding cooling waste heat recovery and utilization system according to claim 5, characterized in that, The bottom of the casting cooling box is equipped with a steel rail, and a mobile vehicle (7) is matched with the steel rail. The casting (8) and sand box are fixed on the mobile vehicle.

8. The casting and molding cooling waste heat recovery and utilization system according to claim 1, characterized in that, The secondary heat source lifting device (4) is also equipped with an auxiliary hot air blower.

9. A casting molding cooling waste heat recovery and utilization system according to claim 1, characterized in that, The drying room (6) is equipped with a gas emergency heating system.

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