Universal type heat recovery system for dried sand and roasted sand

Abstract

The invention relates to the technical field of casting sand production, and discloses a drying sand and roasting sand universal type heat recovery system which comprises a box body, a boiling device is arranged on the box body and used for suspending and fluidizing sand particles, and a heat recovery device is arranged on the box body and used for collecting heat from gas exhausted from the boiling device. The heat recovery device comprises two gas collecting hoods, the two gas collecting hoods are both communicated with the top of the box body, used for collecting high-temperature gas generated in the box body and connected with a cyclone dust collector through a sixth pipeline, and the cyclone dust collector is connected with a second induced draft fan through a fourth pipeline and connected with a kiln and a burner through a fifth pipeline. The device is used for heating casting sand or other materials by using the recovered heat. And through comprehensive application of the boiling device and the heat recovery system, heat energy recovery in the production of the roasting sand for casting is realized, and the production cost and the energy consumption are effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of foundry sand production, in particular to a universal heat recovery system for drying sand and roasting sand. Background Art

[0002] In the production process of foundry sand, especially in the processing of drying sand and roasting sand, a large amount of energy is usually consumed for heating the sand. The traditional foundry sand production system produces a large amount of high-temperature exhaust gas during the roasting process, and the heat energy in these exhaust gases is often not effectively recovered. Direct emission not only leads to energy waste, but also causes certain pollution to the environment. At the same time, in the prior art, although some systems try to recycle the heat in the exhaust gas for secondary use, their structural design is complex, the heat recovery efficiency is low, and the maintenance cost is high.

[0003] In addition, the sand needs to be heated evenly during the drying and roasting process, but the traditional heating method makes it difficult to fully fluidize the sand, resulting in uneven heating, which affects the quality and production efficiency of the foundry sand. In terms of energy efficiency and product quality, the existing heat recovery and heating systems still have a lot of room for improvement.

[0004] To sum up, how to design a heat recovery system that can efficiently recover heat, reduce energy consumption, and improve the sand processing effect has become an urgent problem to be solved in this technical field. To this end, the present invention proposes a universal heat recovery system for drying sand and roasting sand. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a universal heat recovery system for dried sand and roasted sand, which solves the problems of low heat recovery efficiency, energy waste and uneven sand heating in the production process of dried sand and roasted sand.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a universal heat recovery system for drying sand and roasting sand, comprising a box body, on which a boiling device is provided, which is used to suspend and fluidize sand particles, and on which a heat recovery device is provided, which is used to collect heat from the exhaust gas of the boiling device, and the heat recovery device comprises two air collecting hoods, both of which are connected to the top of the box body, and are used to collect high-temperature gases generated in the box body, and are connected to a cyclone dust collector through a pipeline six, and the cyclone dust collector is connected to an induced draft fan two through a pipeline four, and is connected to a kiln and a burner through a pipeline five, and is used to heat casting sand or other materials using the recovered heat, and the boiling device is connected to a blast system, which is used to provide a high-pressure airflow for the interlayer of the boiling device, and guide the high-pressure airflow to the burner and the kiln through an induced draft fan one for reheating.

[0007] Preferably, dust reduction baffles are provided on the top of the two air collecting hoods to reduce the dust content in the airflow and prevent dust from entering the cyclone dust collector. An ash hopper is connected to the bottom of the cyclone dust collector, and a bracket is installed on the outer wall of the cyclone dust collector.

[0008] Preferably, the boiling device includes a high-power blower, which is connected to compartment one through pipe one. A wind hood is provided in the box body, which is used to generate high-pressure wind through the high-power blower to blow the roasted sand in the box body. Compartment two is provided at the bottom of the box body, and a water circulation system is provided in compartment one and compartment two.

[0009] Preferably, a feed port is provided at the top of the box body, a discharge port is provided at the bottom of the box body, and the top of the feed port is connected to the kiln.

[0010] Preferably, the blowing system includes a high-pressure blower, which is connected to the second compartment via a pipeline, the first induced draft fan is connected to the second compartment via a pipeline, and the first induced draft fan is connected to the burner via a pipeline seven.

[0011] Preferably, a valve for controlling air volume is installed on the pipeline seven.

[0012] Preferably, the water circulation system includes a water coil, and the water coil is arranged in the first and second compartments. The water coil is connected to the water tank through an inlet pipe and an outlet pipe, and the end of the inlet pipe is connected to a water supply pump.

[0013] Working principle: During the operation of the system, the boiling device is responsible for keeping the sand particles in a fluidized state. Through a high-power blower, the air flow is introduced into the box, and after being evenly distributed by the wind cap, the sand particles are blown and suspended in the box to achieve fluidization. This fluidization not only improves the uniformity of heating of the sand, but also promotes heat transfer, while avoiding local overheating. In order to further optimize the use of heat, a water circulation system is also integrated inside the box, in which the water coil absorbs the heat in the fluidization process and transfers the heat to other parts to achieve secondary utilization of energy.

[0014] When the boiling device completes the fluidization treatment of the sand particles, a large amount of high-temperature gas generated is collected from the top of the box through two gas collecting hoods. A dust reduction baffle is installed inside the gas collecting hood to preliminarily remove dust particles in the gas to prevent it from entering the subsequent equipment. In the heat recovery device, the collected high-temperature gas is further purified by the cyclone dust collector, and the separated dust is collected in the ash hopper, while the purified gas is guided to the burner and kiln through the induced draft fan 2. The burner uses this recovered heat to continue to heat the foundry sand or other materials, realizing the recycling of heat, thereby minimizing energy consumption.

[0015] In addition, the blast system provides high-pressure airflow to the second layer of the boiling device to maintain the stability of the fluidized state. The system controls the airflow between the induced draft fan 1 and the pipeline 3 to make the gas flow more efficient. By adjusting the valve on the pipeline 7, the amount of gas entering the burner can be accurately controlled to ensure that the heat demand at different stages of the system is reasonably met, thereby further optimizing energy efficiency.

[0016] The water circulation system runs through the entire operation process of the device. Through the cooperation of the water tank, water supply pump and water coil, the water circulation system not only absorbs the excess heat in the boiling device, but also transfers the heat to the water tank through the water inlet and outlet pipes, forming a cycle. The water supply pump continuously pushes the water flow, so that the heat can be continuously transferred between different parts, effectively reducing the heat energy waste of the overall system.

[0017] The present invention provides a universal heat recovery system for drying sand and roasting sand. It has the following beneficial effects:

[0018] The present invention realizes the recovery process of heat energy of roasted sand for casting through the comprehensive utilization of boiling device and heat recovery system, realizes the heat recovery system of roasted sand, reduces production cost and energy consumption, and can be widely used in quartz sand production, regenerated sand production, other fields and drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Among them, 1. Box body; 2. Discharge port; 3. Feed port; 4. Pipeline one; 5. Pipeline two; 6. High-power blower; 7. High-pressure blower; 8. Pipeline three; 9. Draft fan one; 10. Valve; 11. Water tank; 12. Water inlet pipe; 13. Water outlet pipe; 14. Water supply pump; 15. Water coil; 16. Wind hood; 17. Draft fan two; 18. Pipeline four; 19. Pipeline five; 20. Cyclone dust collector; 21. Bracket; 22. Air hood; 23. Pipeline six; 24. Burner; 25. Kiln; 26. Dust reduction partition; 27. Partition one; 28. Partition two; 29. ​​Ash hopper; 30. Pipeline seven. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please see attached Figure 1The embodiment of the present invention provides a universal heat recovery system for drying sand and roasting sand, including a box body 1, on which a boiling device is provided, which is used to suspend and fluidize sand particles, and a heat recovery device is provided on the box body 1, which is used to collect heat from the exhaust gas of the boiling device, and is characterized in that the heat recovery device includes two air collecting hoods 22, and the two air collecting hoods 22 are both connected to the top of the box body 1, and are used to collect high-temperature gas generated in the box body 1, and are connected to the cyclone dust collector 20 through a pipeline 6 23, the cyclone dust collector 20 is connected to the induced draft fan 2 17 through a pipeline 4 18, and is connected to a kiln 25 and a burner 24 through a pipeline 5 19, which is used to heat casting sand or other materials using the recovered heat, and the boiling device is connected to a blast system, which is used to provide a high-pressure airflow for the interlayer of the boiling device, and guide the high-pressure airflow to the burner 24 and the kiln 25 through the induced draft fan 1 9 for reheating.

[0023] Specifically, during operation, the boiling device provided on the box 1 uses the high-pressure airflow provided by the blast system to suspend the sand particles in the airflow to form a fluidized state. This fluidized state can not only increase the contact area between the sand particles and the airflow, ensuring more uniform heating, but also greatly improve the efficiency of roasting and drying. In this process, the sand material can quickly reach the roasting temperature by constantly turning over, thereby shortening the heating time and improving production efficiency.

[0024] The heat recovery device collects the high-temperature gas in the box body 1 through two gas collecting hoods 22 arranged on the top of the box body 1. These high-temperature gases are transported to the cyclone dust collector 20 through the pipeline 6 23. The cyclone dust collector 20 separates the dust particles in the air flow through the centrifugal force and collects them in the ash hopper 29. The purified gas enters the induced draft fan 2 17 through the pipeline 4 18. Subsequently, the purified high-temperature gas is transported to the kiln 25 and the burner 24 through the pipeline 5 19 to realize the heat recovery in the exhaust gas, and is further used to heat the casting sand or other materials.

[0025] The blast system provides continuous high-pressure airflow to the interlayer of the boiling device to maintain the fluidized state of the sand. At the same time, part of the airflow is guided to the burner 24 and the kiln 25 through the induced draft fan 9 and the pipeline 3 8 for secondary heating, which fully utilizes the heat energy in the airflow, reduces the consumption of fresh energy, and optimizes the energy utilization efficiency.

[0026] Through the comprehensive application of the above structures, the present invention can not only achieve rapid and uniform heating of the sand material, but also can maximize the recovery and utilization of the high-temperature exhaust gas generated in the production process, thereby reducing heat energy waste and energy consumption. At the same time, the cyclone dust collector 20 effectively purifies the gas, reduces dust emissions, and reduces environmental pollution. The entire system has a high degree of integration and a compact structure, and can be widely used in the fields of quartz sand production, regenerated sand production, etc.

[0027] Dust reduction baffles 26 are provided at the top of the two air collecting hoods 22 to reduce the dust content in the air flow and prevent dust from entering the cyclone dust collector 20. A ash hopper 29 is connected to the bottom of the cyclone dust collector 20, and a bracket 21 is installed on the outer wall of the cyclone dust collector 20.

[0028] Specifically, the tops of the two air collecting hoods 22 in the present invention are both provided with dust reduction baffles 26, which are used to reduce the dust content in the airflow and prevent the dust from directly entering the cyclone dust collector 20. By performing preliminary dust filtration in the air collecting hood 22, the load of the cyclone dust collector 20 can be reduced, and the dust removal effect and the overall operating efficiency of the system can be improved.

[0029] The cyclone dust collector 20 is connected to an ash hopper 29 at the bottom, and the ash hopper 29 is used to collect dust particles separated by the cyclone dust collector 20. The cyclone dust collector 20 separates dust from gas in the airflow by centrifugal force, and the dust particles fall into the ash hopper 29 due to gravity, ensuring that the purified airflow can continue to enter the subsequent system.

[0030] Through the cooperation of the air collecting hood 22, the dust reduction baffle 26, the cyclone dust collector 20 and its ash hopper 29, the present invention can effectively reduce the dust content in the airflow during the production process, ensure the purification of the gas, avoid dust damage to system equipment, extend the service life of the equipment, and contribute to environmental protection.

[0031] The boiling device includes a high-power blower 6, which is connected to a partition 1 27 through a pipe 1 4. A wind hood 16 is provided in the box body 1, which is used to generate high-pressure wind through the high-power blower 6 to blow the roasting sand in the box body 1. A partition 2 28 is provided at the bottom of the box body 1, and a water circulation system is provided in the partition 1 27 and the partition 2 28.

[0032] Specifically, the blower 6 is used to generate high-pressure airflow, which enters the interlayer 27 through the pipe 4, and then evenly distributes the high-pressure airflow into the box 1 through the hood 16 installed inside the box 1. The function of this high-pressure airflow is to suspend and fluidize the roasted sand particles in the box 1, thereby promoting the rapid transfer of heat and the progress of the roasting process.

[0033] The bottom of the box 1 is provided with a second interlayer 28, and the first interlayer 27 and the second interlayer 28 together constitute the core structure of the boiling device. A water circulation system is designed in these two interlayers. The water circulation system is arranged in the first interlayer 27 and the second interlayer 28 through the water coil 15. The water flows through the coil to absorb the excess heat in the box 1, forming a cycle to maintain the appropriate temperature in the box 1.

[0034] Through this design, the boiling device can not only effectively improve the fluidization and heating efficiency of the sand, but also recover part of the heat through the water circulation system, further optimizing the use of energy and reducing the waste of heat energy.

[0035] A feed port 3 is provided at the top of the box body 1 , a discharge port 2 is provided at the bottom of the box body 1 , and the top of the feed port 3 is connected to the kiln 25 .

[0036] The blowing system includes a high-pressure blower 7, which is connected to the second compartment 28 through a pipeline 25, an induced draft fan 1 9 is connected to the second compartment 28 through a pipeline 3 8, and an induced draft fan 1 9 is connected to the burner 24 through a pipeline 7 30.

[0037] A valve 10 for controlling the air volume is installed on the pipeline 7 30 .

[0038] Specifically, the high-pressure blower 7 is used to deliver high-pressure airflow to the second interlayer 28, providing sufficient airflow to maintain the fluidized state in the boiling device, ensuring that the sand particles can be fully fluidized in the box 1, thereby achieving rapid heating and roasting.

[0039] In addition, the induced draft fan 1 9 is connected to the interlayer 28 through the pipeline 3 8, thereby guiding part of the high-pressure airflow to the burner 24. The induced draft fan 1 9 is further connected to the burner 24 through the pipeline 7 30, and the airflow is transported to the burner 24 for the reheating process. The burner 24 uses this part of the high-temperature gas to further improve the effective utilization rate of the heat in the system.

[0040] In order to more accurately control the air flow in the system, a valve 10 for controlling the air flow is installed on the pipeline 7 30. The valve 10 can adjust the air flow entering the burner 24 to ensure the stability and balance of the air flow, thereby optimizing the use of heat energy in the combustion process, further improving energy utilization efficiency and reducing energy waste.

[0041] Through the coordinated use of the high-pressure blower 7 and the induced draft fan 9, the blowing system of the present invention can provide a continuous high-pressure airflow for the boiling device, and at the same time adjust the air flow entering the burner 24, so as to achieve the purpose of energy saving and efficient heating.

[0042] The water circulation system includes a water coil 15, which is arranged in the first compartment 27 and the second compartment 28. The water coil 15 is connected to the water tank 11 through the water inlet pipe 12 and the water outlet pipe 13. The end of the water inlet pipe 12 is connected to a water supply pump 14.

[0043] Specifically, the function of the water circuit coil 15 is to absorb the heat inside the box 1 through water flow, and then transfer the heat to the water circulation system. The arrangement of the coil can effectively recover the waste heat in the system, thereby reducing energy waste.

[0044] The water circuit coil 15 is connected to the water tank 11 through the water inlet pipe 12 and the water outlet pipe 13 to form a closed-loop water circulation system. The water tank 11 is used to store cooling water and ensure the continuous flow of water in the water circulation system. The cooling water absorbs heat through the water circuit coil 15, and the hot water returns to the water tank 11 through the water outlet pipe 13, and circulates continuously to maintain the temperature balance in the system.

[0045] In order to maintain the stable operation of the water flow, a water supply pump 14 is connected to the end of the water inlet pipe 12. The water supply pump 14 is used to push the water flow into the water circuit coil 15 to ensure the continuous circulation of water in the coil, and absorb heat from the system through the coil and send it back to the water tank 11 for cooling.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A universal heat recovery system for drying sand and roasting sand, comprising a housing (1), wherein a boiling device is provided on the housing (1) for suspending and fluidizing sand particles, and a heat recovery device is provided on the housing (1) for collecting heat from exhaust gas of the boiling device, characterized in that: The heat recovery device comprises two air collecting hoods (22), both of which are connected to the top of the box body (1) and are used to collect high-temperature gas generated in the box body (1), and are connected to the cyclone dust collector (20) through a pipeline six (23). The cyclone dust collector (20) is connected to the induced draft fan two (17) through a pipeline four (18), and is connected to the kiln (25) and the burner (24) through a pipeline five (19). It is used to heat casting sand or other materials using the recovered heat. The boiling device is connected to a blast system, which is used to provide a high-pressure airflow for the interlayer of the boiling device, and guide the high-pressure airflow to the burner (24) and the kiln (25) through the induced draft fan one (9) for reheating.

2. A universal heat recovery system for drying sand and roasting sand according to claim 1, characterized in that: The top of the two air collecting hoods (22) is provided with a dust reduction baffle (26) for reducing the dust content in the air flow and preventing dust from entering the cyclone dust collector (20). The bottom of the cyclone dust collector (20) is connected to an ash hopper (29), and the outer wall of the cyclone dust collector (20) is installed with a bracket (21).

3. A universal heat recovery system for drying sand and roasting sand according to claim 1, characterized in that: The boiling device comprises a high-power blower (6), which is connected to a partition one (27) via a pipe one (4); a wind cap (16) is arranged inside the box (1) for generating high-pressure wind through the high-power blower (6) to blow the roasted sand inside the box (1); a partition two (28) is arranged at the bottom of the box (1); and a water circulation system is arranged in the partition one (27) and the partition two (28).

4. A universal heat recovery system for drying sand and roasting sand according to claim 1, characterized in that: The top of the box body (1) is provided with a feed port (3), the bottom of the box body (1) is provided with a discharge port (2), and the top of the feed port (3) is connected to a kiln (25).

5. A universal heat recovery system for drying sand and roasting sand according to claim 3, characterized in that: The air blowing system comprises a high-pressure blower (7), wherein the high-pressure blower (7) is connected to the second compartment (28) via a second pipeline (5), the first induced draft fan (9) is connected to the second compartment (28) via a third pipeline (8), and the first induced draft fan (9) is connected to the burner (24) via a seventh pipeline (30).

6. A universal heat recovery system for drying sand and roasting sand according to claim 5, characterized in that: The pipeline seven (30) is provided with a valve (10) for controlling the air volume.

7. A universal heat recovery system for drying sand and roasting sand according to claim 3, characterized in that: The water circulation system comprises a water circuit coil (15), wherein the water circuit coil (15) is arranged in the first compartment (27) and the second compartment (28), and the water circuit coil (15) is connected to the water tank (11) via a water inlet pipe (12) and a water outlet pipe (13), and the end of the water inlet pipe (12) is connected to a water supply pump (14).

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