Drying device with gas purification mechanism

Abstract

The utility model relates to the field of mineral source potassium fulvate solution processing, and discloses a drying device with a gas purification mechanism, which comprises a drying machine and a purification mechanism, the top of the drying machine is communicated and connected with a waste gas pipe, the other end of the waste gas pipe is provided with the purification mechanism, and a heat exchange structure is arranged between the purification mechanism and the waste gas pipe. The heat exchange structure is connected with the drying machine, heat of drying waste gas is efficiently recycled through the heat exchange structure, on one hand, waste of heat of high-temperature waste gas in traditional drying equipment is avoided, energy consumption is effectively reduced, on the other hand, the recycled heat is introduced into the drying machine, the requirement for extra hot air is reduced, and the energy consumption is reduced. The waste gas is treated through the multi-stage purification mechanism, emission of pollutants such as volatile organic compounds and acid gas is remarkably reduced, the dual goals of environmental protection and energy conservation are achieved, and the requirement of the current time of green development is met.

Description

Technical Field

[0001] This utility model relates to the field of processing potassium humate solution from mineral sources, specifically a drying device with a gas purification mechanism. Background Technology

[0002] In many industrial production processes, such as the processing of potassium humate solution from mineral sources, drying devices with gas purification mechanisms play an indispensable role. During the drying process, waste gas containing pollutants such as volatile organic compounds (VOCs) and acidic gases is generated. Drying devices with gas purification mechanisms can treat the waste gas through components such as condensers, removing or reducing pollutants such as VOCs to below emission standards, thereby reducing pollution to the atmospheric environment and protecting ecological balance and human health.

[0003] Traditional drying devices often fail to effectively recover high-temperature exhaust gases, resulting in wasted heat energy and increased energy consumption. Furthermore, the continuous introduction of hot air further depletes energy. Secondly, the gas purification section struggles to completely remove pollutants from the exhaust gas, particularly volatile organic compounds and fine particulate matter, failing to meet environmental protection requirements. These devices often employ a separate design, occupying a large area, with complex connections, making them prone to gas leaks and affecting performance. In addition, recyclable materials generated during the drying process are often not fully utilized; for example, condensed VOCs liquids are directly discarded, failing to improve the drying effect. Therefore, we propose a drying device with an integrated gas purification mechanism. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the prior art, this utility model provides a drying device with a gas purification mechanism, which solves the above-mentioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a drying device with a gas purification mechanism, comprising a dryer and a purification mechanism, wherein an exhaust gas pipe is connected through the top of the dryer, and a purification mechanism is provided at the other end of the exhaust gas pipe, and a heat exchange structure is provided between the purification mechanism and the exhaust gas pipe, and the heat exchange structure is connected to the dryer.

[0008] Preferably, the heat exchange structure includes a bent pipe, a spiral blade, a sleeve, and a sealing plate. A flange is fixedly connected to the end of the exhaust pipe away from the dryer. A flange is fixedly connected to the bent end of the bent pipe. The flange of the exhaust pipe is connected to the flange of the bent pipe by bolts and nuts. A spiral blade is fixedly connected to the outer cylindrical surface of the other fold of the bent pipe without a flange. The sleeve is sleeved to the bent pipe. The spiral blade is between the sleeve and the bent pipe. Sealing plates are fixedly connected to both ends of the sleeve. The inner ring of the sealing plate is fixedly connected to the bent pipe.

[0009] Preferably, the heat exchange structure includes a suction fan and an air inlet pipe. One end of the air inlet pipe is connected through to the cylindrical surface of the sleeve. The air inlet pipe is tangentially connected to the cylindrical surface of the sleeve. The air inlet pipe is located on the side of the sleeve away from the exhaust pipe. The position of the air inlet pipe is between the spiral gaps of the spiral blades. The suction fan is installed at the end of the air inlet pipe away from the sleeve. The bottom of the suction fan is fixed on the platform.

[0010] Preferably, the heat exchange structure further includes an exhaust pipe, an induced draft fan, and an insulation pipe. One end of the exhaust pipe is connected through to the cylindrical surface of the sleeve, and the exhaust pipe is tangentially connected to the cylindrical surface of the sleeve. The exhaust pipe is located on the side of the sleeve close to the exhaust pipe, and its position is between the spiral gaps of the spiral blades. The exhaust pipe and the inlet pipe are opposite to each other on both sides of the sleeve. An induced draft fan is installed at the end of the exhaust pipe away from the sleeve. The bottom of the induced draft fan is fixed to the top surface of the dryer. An insulation pipe is fixedly installed at the air outlet of the induced draft fan, and the other end of the insulation pipe is connected through to the side wall of the dryer.

[0011] Preferably, the purification mechanism includes a condenser, a spray tower, and an activated carbon adsorption tower. The end of the bent pipe facing away from the exhaust pipe is connected to the inlet pipe of the condenser via a flange. The outlet pipe of the condenser is connected to the inlet pipe of the spray tower via a flange. The outlet pipe of the spray tower is connected to the inlet pipe of the activated carbon adsorption tower via a flange.

[0012] Preferably, the top of the dryer is connected to a feed pipe, the condenser is connected to a liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the side wall of the feed pipe.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, the present invention provides a drying device with a gas purification mechanism, which has the following beneficial effects:

[0015] 1. This drying device with a gas purification mechanism achieves efficient heat recovery and reuse of the drying exhaust gas through a heat exchange structure. On the one hand, it avoids the waste of heat from high-temperature exhaust gas in traditional drying equipment, effectively reducing energy consumption. On the other hand, the recovered heat is introduced into the dryer, reducing the need for additional hot air and further reducing energy consumption. At the same time, the exhaust gas is treated through a multi-stage purification mechanism, which significantly reduces the emission of pollutants such as volatile organic compounds and acidic gases, achieving the dual goals of environmental protection and energy conservation, and meeting the current requirements of green development.

[0016] 2. The drying device with gas purification mechanism can recover VOCs liquid as a drying aid, optimize the atomization effect of materials, improve drying efficiency, and make the final product have uniform particle size and better quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is an exploded view of the structure of this utility model;

[0019] Figure 3 This is a cross-sectional schematic diagram of the heat exchange structure of this utility model;

[0020] Figure 4 for Figure 3 A magnified view of part A in the diagram.

[0021] In the diagram: 1. Dryer; 2. Exhaust pipe; 3. Feed pipe; 4. Bend pipe; 5. Sleeve; 6. Condenser; 7. Spray tower; 8. Activated carbon adsorption tower; 9. Liquid outlet pipe; 10. Gas outlet pipe; 11. Exhaust fan; 12. Suction fan; 13. Insulation pipe; 14. Spiral blade; 15. Sealing plate; 16. Inlet pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 A drying device with a gas purification mechanism includes a dryer 1 and a purification mechanism. The top of the dryer 1 is connected to an exhaust gas pipe 2, and the other end of the exhaust gas pipe 2 is provided with a purification mechanism. A heat exchange structure is provided between the purification mechanism and the exhaust gas pipe 2, and the heat exchange structure is connected to the dryer 1.

[0024] Furthermore, the heat exchange structure includes a bent pipe 4, a spiral blade 14, a sleeve 5, and a sealing plate 15. A flange is fixedly connected to the end of the exhaust pipe 2 facing away from the dryer 1. A flange is fixedly connected to the bent end of the bent pipe 4. The flange of the exhaust pipe 2 is connected to the flange of the bent pipe 4 by bolts and nuts. A spiral blade 14 is fixedly connected to the outer cylindrical surface of the other fold of the bent pipe 4 without a flange. The sleeve 5 is sleeved with the bent pipe 4, with the spiral blade 14 positioned between the sleeve 5 and the bent pipe 4. Both ends of the sleeve 5 are fixed. A sealing plate 15 is connected, and the inner ring of the sealing plate 15 is fixedly connected to the bent tube 4. The bent tube 4 contains hot exhaust gas generated in the dryer 1. The spiral blades 14 are used to increase the heat exchange area of ​​the bent tube 4. The sleeve 5 is installed outside the spiral blades 14. The air in the sleeve 5 circulates between the spiral blades 14, increasing the residence time and guiding the flow of gas. The sealing plate 15 is used to seal both ends of the sleeve 5. The exposed part of the bent tube 4 is wrapped with heat insulation cotton. The outer surface of the sleeve 5 is wrapped with heat insulation cotton.

[0025] Furthermore, the heat exchange structure includes a suction fan 12 and an air inlet pipe 16. One end of the air inlet pipe 16 is connected through to the cylindrical surface of the sleeve 5. The air inlet pipe 16 is tangentially connected to the cylindrical surface of the sleeve 5. The air inlet pipe 16 is located on the side of the sleeve 5 away from the exhaust pipe 2. The position of the air inlet pipe 16 is between the spiral gaps of the spiral blades 14. The suction fan 12 is installed at the end of the air inlet pipe 16 away from the sleeve 5. The bottom of the suction fan 12 is fixed on the platform. The air inlet pipe 16 is used to introduce clean air into the sleeve 5. The suction fan 12 is used to draw air into the sleeve 5. The air inlet pipe 16 is between the threaded gaps of the spiral blades 14, tangentially entering between the spiral blades 14 and flowing with the spiral shape of the spiral blades 14.

[0026] Furthermore, the heat exchange structure also includes an exhaust pipe 10, an induced draft fan 11, and an insulation pipe 13. One end of the exhaust pipe 10 is connected to the cylindrical surface of the sleeve 5, and the exhaust pipe 10 is tangentially connected to the cylindrical surface of the sleeve 5. The exhaust pipe 10 is located on the side of the sleeve 5 near the exhaust pipe 2, and its position is between the spiral gaps of the spiral blades 14. The exhaust pipe 10 and the inlet pipe 16 are opposite each other on both sides of the sleeve 5. An induced draft fan 11 is installed at the end of the exhaust pipe 10 away from the sleeve 5. The bottom of the induced draft fan 11 is fixed to the top surface of the dryer 1. An insulation pipe 13 is fixedly installed at the outlet of the induced draft fan 11, and the other end of the insulation pipe 13 is connected to the side of the dryer 1. The walls are connected, and the exhaust pipe 10 is used to draw out the hot air between the spiral blades 14. The blower 11 is used to draw out the hot air inside the spiral blades 14. The insulation pipe 13 is used to introduce hot air into the dryer 1 at the location where hot air is needed. The outer surfaces of the exhaust pipe 10 and the insulation pipe 13 are wrapped with insulation cotton. Air enters the sleeve 5 and the space between the spiral blades 14 from the intake pipe 16 and flows in the spiral gap of the spiral blades 14. When the exhaust gas generated by the dryer 1 passes through the bend pipe 4, the bend pipe 4 conducts heat through the spiral blades 14 to the air between the spiral blades 14. The air between the spiral blades 14 becomes hot and then enters the dryer 1 through the exhaust pipe 10.

[0027] Furthermore, the purification mechanism includes a condenser 6, a spray tower 7, and an activated carbon adsorption tower 8. The end of the bend pipe 4 facing away from the exhaust gas pipe 2 is connected to the inlet pipe of the condenser 6 via a flange. The outlet pipe of the condenser 6 is connected to the inlet pipe of the spray tower 7 via a flange, and the outlet pipe of the spray tower 7 is connected to the inlet pipe of the activated carbon adsorption tower 8 via a flange. The condenser 6 is used to condense the exhaust gas after passing through the bend pipe 4. By adjusting the temperature and flow rate of the cooling medium, water vapor and some high-boiling-point VOCs in the exhaust gas are condensed into liquid and separated from the exhaust gas. The condensed and recovered exhaust gas enters the spray tower 7, which is equipped with multiple spray devices. Alkaline absorbent liquid, such as sodium hydroxide solution, is evenly sprayed down from the top of the tower by a spray pump, fully contacting the exhaust gas rising from the bottom of the tower. Acidic gases in the exhaust gas (such as sulfur dioxide and nitrogen oxides) are absorbed. The waste gas undergoes a neutralization reaction with the alkaline absorbent to generate corresponding salts, which flow into the circulation tank at the bottom of the tower along with the absorbent. The absorbent in the circulation tank can be continuously circulated by a circulation pump. When the salt concentration in the absorbent reaches a certain level or the alkalinity of the absorbent decreases to the point where it cannot meet the absorption requirements, the absorbent needs to be replaced or regenerated. The waste gas after spray absorption treatment enters the activated carbon adsorption tower 8, which is filled with granular or honeycomb activated carbon. The waste gas enters from the bottom of the tower and flows upward through the activated carbon layer. VOCs molecules are adsorbed on the microporous surface of the activated carbon due to intermolecular forces, thereby achieving separation from the waste gas. After the waste gas is treated by activated carbon adsorption, the VOCs concentration can be significantly reduced to meet the corresponding emission standards. To ensure the adsorption effect, the activated carbon needs to be replaced or regenerated regularly.

[0028] Furthermore, a feed pipe 3 is connected to the top of the dryer 1, and a liquid outlet pipe 9 is connected to the condenser 6. The other end of the liquid outlet pipe 9 is connected to the side wall of the feed pipe 3. The feed pipe 3 is used for feeding, and the liquid outlet pipe 9 introduces the VOCs liquid generated in the condenser 6 into the dryer 1. In the drying process, the VOCs liquid can be used as an auxiliary agent to adjust the surface tension and viscosity of the mineral potassium humate solution. Adding an appropriate amount of VOCs liquid such as ethyl acetate can make the solution better atomize into fine droplets, increase the contact area with hot air, improve drying efficiency, and help obtain mineral potassium humate products with uniform particle size and good quality.

[0029] Structural Description:

[0030] Dryer 1: It is mostly box-shaped or cylindrical. As the core drying equipment, it contains materials and dries them by generating hot air.

[0031] Exhaust pipe 2: a tubular structure that connects dryer 1 and purification mechanism, responsible for transporting the high-temperature exhaust gas generated during the drying process of dryer 1 to purification mechanism;

[0032] Feed pipe 3: A tubular structure installed at the top of dryer 1 to provide a channel for materials to enter dryer 1;

[0033] Bending pipe 4: It is bent and one end is connected to the exhaust pipe 2 through a flange. The hot exhaust gas discharged from the dryer 1 flows inside. The outside of the pipe is equipped with spiral blades, which can effectively conduct heat and realize heat exchange with the air inside the sleeve 5.

[0034] Sleeve 5: A tubular structure that is sleeved on the outside of the bent tube 4. A spiral blade is provided between the sleeve and the bent tube 4. Both ends are sealed by sealing plates 15 to provide space for air circulation and guide air to exchange heat with the bent tube 4.

[0035] Condenser 6: Usually a columnar or box-shaped structure, it condenses the exhaust gas after heat exchange through the bent tube 4 through the principle of heat exchange, so that the water vapor and some high-boiling-point VOCs in the exhaust gas are condensed into liquid, reducing the pollutant content of the exhaust gas.

[0036] Spray tower 7: Mostly columnar structure, with multiple spray devices inside the tower. By spraying alkaline absorbent liquid, it neutralizes the rising waste gas and removes acidic gases from the waste gas.

[0037] Activated carbon adsorption tower 8: columnar structure, filled with granular or honeycomb activated carbon, utilizes the adsorption effect of activated carbon to further remove VOCs in waste gas, ensuring that waste gas meets emission standards.

[0038] Liquid outlet pipe 9: tubular structure, one end connected to condenser 6, the other end connected to feed pipe 3, introduces the VOCs liquid generated by condenser 6 into dryer 1 to assist in material drying;

[0039] Air outlet pipe 10: a tubular structure, one end is tangentially connected to the sleeve 5, and the other end is connected to the induced draft fan 11, used to draw out the heated air inside the sleeve 5;

[0040] Exhaust fan 11: It generates suction through mechanical action to extract the hot air in the sleeve 5 and send it back to the dryer 1 through the insulation pipe 13;

[0041] Fan 12: It draws clean air into the sleeve 5 through the air inlet pipe 16 by mechanical suction, providing an air source for heat exchange;

[0042] Insulation pipe 13: tubular structure, covered with insulation material, connecting the exhaust fan 11 and the dryer 1, transporting hot air back to the dryer 1 to reduce heat loss;

[0043] Spiral fin 14: It spirals around the outside of the bent tube 4, increases the heat exchange area of ​​the bent tube 4, guides the air flow inside the sleeve 5, prolongs the air residence time, and enhances the heat exchange effect.

[0044] Sealing plate 15: A circular plate structure, fixed at both ends of the sleeve 5, with its inner ring connected to the bent tube 4, used to seal the sleeve 5, prevent air leakage, and ensure smooth heat exchange;

[0045] Air intake pipe 16: tubular structure, one end is tangentially connected to sleeve 5, and the other end is connected to suction fan 12, which introduces clean air into sleeve 5 and guides the air to flow in a spiral shape along spiral blade 14.

[0046] Working principle: The material enters the dryer 1 through the feed pipe 3. The dryer 1 generates hot air to dry the material. During the drying process, a large amount of high-temperature waste gas is generated. This waste gas carries heat and various pollutants and is discharged from the dryer 1 through the waste gas pipe 2. The suction fan 12 is started, and clean air is drawn into the sleeve 5 through the air inlet pipe 16. The air inlet pipe 16 is tangential to the cylindrical surface of the sleeve 5 and is located between the spiral gaps of the spiral blades 14, so that the air enters tangentially between the spiral blades 14 and flows with the spiral shape of the spiral blades 14. The hot waste gas generated by the dryer 1 enters the bent pipe 4. The spiral blades 14 are fixed on the outer cylindrical surface of the bent pipe 4, and their function is to increase the heat exchange area of ​​the bent pipe 4. When the hot waste gas enters the bent pipe 4, the heat exchange area is increased. During internal flow, heat is transferred through the bent pipe 4 and spiral blades 14 to the air flowing between the spiral blades 14. Since both ends of the sleeve 5 are sealed by the sealing plates 15, the air circulates between the spiral blades 14, increasing the residence time and facilitating heat absorption. Simultaneously, the exposed portion of the bent pipe 4 and the insulation cotton wrapped around the outer surface of the sleeve 5 reduce heat loss. The induced draft fan 11 starts, drawing the heated air between the spiral blades 14 out through the exhaust pipe 10, and then through the insulation pipe 13 to the location requiring hot air within the dryer 1, achieving heat recovery and reducing energy consumption during the drying process. The exhaust gas, after heat exchange through the bent pipe 4, enters the condenser 6. By adjusting the temperature and flow rate of the cooling medium, the water vapor and some other components in the exhaust gas are cooled. High-boiling-point VOCs are condensed into liquid and separated from the waste gas, initially reducing the pollutant content in the waste gas. The waste gas after condensation and recovery enters spray tower 7. Inside the tower, a multi-layer spray device evenly sprays alkaline absorbent liquid (such as sodium hydroxide solution) from the top of the tower, ensuring full contact with the waste gas rising from the bottom. Acidic gases (such as sulfur dioxide and nitrogen oxides) in the waste gas undergo a neutralization reaction with the alkaline absorbent liquid, generating corresponding salts. These salts flow with the absorbent liquid into the circulation tank at the bottom of the tower. The absorbent liquid in the circulation tank can be continuously circulated by a circulation pump. When the salt concentration in the absorbent liquid reaches a certain level or the alkalinity decreases to the point where it cannot meet the absorption requirements, the absorbent liquid needs to be replaced or regenerated. The waste gas after spray absorption treatment enters the active... The activated carbon adsorption tower 8 is filled with granular or honeycomb activated carbon. It uses intermolecular forces to adsorb VOCs molecules in the waste gas onto its microporous surface, further reducing the concentration of VOCs in the waste gas and enabling the waste gas to meet the corresponding emission standards. To ensure the adsorption effect, the activated carbon needs to be replaced or regenerated regularly. The VOCs liquid generated in the condenser 6 is introduced into the feed pipe 3 through the liquid outlet pipe 9 and then enters the dryer 1. In the drying process, these VOCs liquids can be used as an auxiliary agent to adjust the surface tension and viscosity of the mineral potassium humate solution, so that the solution can be better atomized into fine droplets, increasing the contact area with hot air, improving drying efficiency, and helping to obtain mineral potassium humate products with uniform particle size and good quality.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drying device with a gas purification mechanism, comprising a dryer (1) and a purification mechanism, wherein a waste gas pipe (2) is connected through the top of the dryer (1), and a purification mechanism is provided at the other end of the waste gas pipe (2), characterized in that: A heat exchange structure is provided between the purification mechanism and the exhaust pipe (2), and the heat exchange structure is connected to the dryer (1); The heat exchange structure includes a bent pipe (4), a spiral blade (14), a sleeve (5), and a sealing plate (15). The end of the exhaust pipe (2) away from the dryer (1) is fixedly connected to a flange. The bent end of the bent pipe (4) is fixedly connected to a flange. The flange of the exhaust pipe (2) and the flange of the bent pipe (4) are connected by bolts and nuts. The spiral blade (14) is fixedly connected to the outer cylindrical surface of the other fold of the bent pipe (4) without the flange installed. The sleeve (5) is sleeved to the bent pipe (4). The spiral blade (14) is between the sleeve (5) and the bent pipe (4). The two ends of the sleeve (5) are fixedly connected to the sealing plate (15). The inner ring of the sealing plate (15) is fixedly connected to the bent pipe (4). The heat exchange structure includes a suction fan (12) and an air inlet pipe (16). One end of the air inlet pipe (16) is connected through to the cylindrical surface of the sleeve (5). The air inlet pipe (16) is tangentially connected to the cylindrical surface of the sleeve (5). The air inlet pipe (16) is on the side of the sleeve (5) away from the exhaust pipe (2). The position of the air inlet pipe (16) is between the spiral gaps of the spiral blades (14). The suction fan (12) is installed at the end of the air inlet pipe (16) away from the sleeve (5). The bottom of the suction fan (12) is fixed on the platform. The heat exchange structure also includes an exhaust pipe (10), an induced draft fan (11), and an insulation pipe (13). One end of the exhaust pipe (10) is connected through to the cylindrical surface of the sleeve (5). The exhaust pipe (10) is tangentially connected to the cylindrical surface of the sleeve (5). The exhaust pipe (10) is on the side of the sleeve (5) near the exhaust pipe (2). The position of the exhaust pipe (10) is between the spiral gaps of the spiral blades (14). The exhaust pipe (10) and the inlet pipe (16) are opposite to each other on both sides of the sleeve (5). An induced draft fan (11) is installed at the end of the exhaust pipe (10) away from the sleeve (5). The bottom of the induced draft fan (11) is fixed on the top surface of the dryer (1). An insulation pipe (13) is fixedly installed at the outlet of the induced draft fan (11). The other end of the insulation pipe (13) is connected through to the side wall of the dryer (1).

2. The drying device with a gas purification mechanism according to claim 1, characterized in that: The purification mechanism includes a condenser (6), a spray tower (7), and an activated carbon adsorption tower (8). The end of the bent pipe (4) away from the exhaust pipe (2) is connected to the inlet pipe of the condenser (6) through a flange. The outlet pipe of the condenser (6) is connected to the inlet pipe of the spray tower (7) through a flange. The outlet pipe of the spray tower (7) is connected to the inlet pipe of the activated carbon adsorption tower (8) through a flange.

3. A drying device with a gas purification mechanism according to claim 2, characterized in that: The top of the dryer (1) is connected to a feed pipe (3), and the condenser (6) is connected to a liquid outlet pipe (9). The other end of the liquid outlet pipe (9) is connected to the side wall of the feed pipe (3).

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