A nitre drying bed

Abstract

The utility model discloses a kind of nitre drying bed, belong to chemical equipment technical field;It includes: boiling drying bed, heat-absorbing component and heat exchange component, boiling drying bed includes bed body and the air inlet and air outlet of being set to the both sides of bed body;Heat-absorbing component includes the liquid storage tank for storing heat-conducting medium, air outlet is communicated with the liquid storage tank by pipeline, heat-conducting medium can absorb the heat of hot air;Heat exchange component includes encapsulation box, liquid flow passage, airflow passage and the heat exchange unit of being set in encapsulation box, the both ends of liquid flow passage are communicated with the liquid storage tank respectively, the both ends of airflow passage are communicated with air inlet and atmosphere respectively, the middle part of liquid flow passage and airflow passage is connected by heat exchange unit, to preheat the gas input to bed body is provided for.The utility model can realize heat energy recycling, to improve heat energy utilization, reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a nitrate drying bed. Background Technology

[0002] The main component of Glauber's salt is sodium sulfate decahydrate, with the chemical formula Na₂SO₄·10H₂O. The drying process of Glauber's salt involves more than just removing surface moisture; it also involves a dehydration phase change. In actual industrial production, fluidized bed dryers are one of the most commonly used and efficient devices for drying Glauber's salt.

[0003] After the fluidized bed furnace dries sodium sulfate, it produces a large amount of hot and humid waste gas. This waste gas is generally not effectively utilized, and energy is wasted. Utility Model Content

[0004] In view of this, it is necessary to provide a nitrate drying bed to solve the problem of wasted wet and hot exhaust gas generated by existing fluidized bed furnaces.

[0005] This utility model provides a nitrate drying bed, comprising: A fluidized bed drying bed, comprising a bed body and air inlets and outlets disposed on both sides of the bed body; A heat-absorbing component, comprising a liquid storage tank for storing a heat-conducting medium, wherein the air outlet is connected to the liquid storage tank via a pipe, and the heat-conducting medium is capable of absorbing heat from hot air; The heat exchange assembly includes an encapsulation box, a liquid flow path, an air flow path, and a heat exchange unit disposed in the encapsulation box. The two ends of the liquid flow path are respectively connected to the liquid storage tank, and the two ends of the air flow path are respectively connected to the air inlet and the atmosphere. The middle of the liquid flow path and the air flow path are connected by the heat exchange unit to preheat the gas input into the bed.

[0006] Furthermore, the heat exchange unit includes multiple heat exchange tubes, with both ends of the multiple heat exchange tubes respectively connected to the airflow passage. The heat exchange tubes are disposed in the encapsulation box. The encapsulation box is connected to the middle of the liquid flow passage. The heat exchange tubes are immersed in the heat-conducting medium for heat exchange.

[0007] Furthermore, the heat exchange tube body is provided with spiral fins for heat conduction on its exterior, and the inner side of the spiral fins is fixedly connected to the outer wall of the heat exchange tube body.

[0008] Furthermore, the fluidized bed dryer also includes an exhaust fan, the input end of which is connected to one end of the airflow passage, and the output end of which is connected to the air inlet.

[0009] Furthermore, the heat absorption assembly also includes a bubble generator, which is disposed in the liquid storage tank and connected to the air outlet through a pipe. The bubble generator can promote heat absorption by the heat transfer medium.

[0010] Furthermore, a feeder is provided above the bed, and the feeder can control the feeding speed of the bed.

[0011] Furthermore, a discharge pipe is provided below the bed body, which can output the dried sodium sulfate.

[0012] Furthermore, a filter for filtering dust is provided between the air outlet and the liquid storage tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) A nitrate drying bed of the present invention is provided with a heat absorption component. The heat absorption component includes a liquid storage tank for storing a heat-conducting medium. The gas outlet is connected to the liquid storage tank through a pipe. The heat-conducting medium can absorb the heat in the waste gas introduced into it to achieve heat fixation.

[0014] (2) A nitrate drying bed of the present invention is provided with a heat exchange component. The heat exchange component includes a packaging box, a liquid flow path, an air flow path, and a heat exchange unit disposed in the packaging box. The two ends of the liquid flow path are respectively connected to the liquid storage tank, and the two ends of the air flow path are respectively connected to the air inlet and the atmosphere. The middle of the liquid flow path and the air flow path are connected by the heat exchange unit. The heat-conducting medium flowing through the liquid flow path can exchange heat with the gas flowing through the air flow path to preheat the input gas, which can not only recover energy, but also improve drying efficiency. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the heat exchange component and the exhaust fan in this utility model; Figure 3 This is a cross-sectional view of the heat exchange component in this utility model; Figure 4 This is a schematic diagram of the heat exchange tube body in this utility model; Figure 5 This is a schematic diagram of the structure of the fluidized bed drying bed in this utility model.

[0016] In the diagram, 100 is the fluidized bed dryer; 110 is the bed body; 111 is the air inlet; 112 is the air outlet; 120 is the exhaust fan; 130 is the feeder; 140 is the discharge pipe; and 150 is the filter. 200. Heat-absorbing component; 210. Liquid storage tank; 300, Heat exchange assembly; 310, Encapsulation housing; 320, Liquid flow path; 330, Air flow path; 340, Heat exchange unit; 341, Heat exchange tube body; 342, Spiral fins. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0018] This embodiment of a nitrate drying bed relates to the field of chemical equipment technology. The fluidized bed drying bed 100 is equipped with a heat absorption component 200 and a heat exchange component 300, which can preheat the incoming air and realize the recycling of heat energy, thereby improving the heat energy utilization rate and reducing energy consumption.

[0019] Please see Figures 1 to 5 This embodiment of a sodium sulfate drying bed includes: a fluidized bed drying bed 100, a heat absorption component 200, and a heat exchange component 300. The fluidized bed drying bed 100 can dry the input sodium sulfate. The heat absorption component 200 can absorb heat from the waste heat gas of the dried sodium sulfate, and the heat exchange unit 300 can transfer the heat stored in the heat absorption component 200 to the input airflow to preheat the input airflow.

[0020] The fluidized bed drying 100 includes a bed body 110 and an air inlet 111 and an air outlet 112 disposed on both sides of the bed body 110. The airflow is input from the air inlet 111 of the bed body 110, and after the Glauber's salt is fluidized and dried, it is discharged from the air outlet 112, thus completing the drying of Glauber's salt.

[0021] The heat absorption assembly 200 includes a liquid storage tank 210 for storing a heat-conducting medium. An outlet 112 is connected to the liquid storage tank 210 via a pipe. The heat-conducting medium can absorb heat from the waste gas introduced into it, thus fixing the heat. The heat exchange assembly 300 includes an encapsulation housing 310, a liquid flow path 320, an air flow path 330, and a heat exchange unit 340 disposed within the encapsulation housing 310. Both ends of the liquid flow path 320 are connected to the liquid storage tank 210, and both ends of the air flow path 330 are connected to the inlet 111 and the atmosphere, respectively. The middle sections of the liquid flow path 320 and the air flow path 330 are connected via the heat exchange unit 340. The heat-conducting medium flowing through the liquid flow path 320 can exchange heat with the gas flowing through the air flow path 330, preheating the input gas. This not only recovers energy but also improves drying efficiency.

[0022] During operation, high-temperature exhaust gas is introduced into the liquid storage tank 210 from the outlet 112 of the drying bed. The heat transfer medium absorbs the sensible heat of the exhaust gas and its temperature rises. The heated heat transfer medium is then transported by a circulating pump to the encapsulation box 310 of the heat exchange component 300, where it forms a counter-current heat exchange with the incoming airflow in the heat exchange unit 340. Fresh air is heated to a predetermined temperature before entering the drying bed. The preheated hot air is injected into the bottom of the bed 110 from the inlet 111, forming a stable fluidized state for drying the sodium sulfate.

[0023] It should be added that the fluidized bed dryer 100 is a device that uses the fluidization principle to dry materials. Specifically, it can be implemented by using a closed container with a gas distribution plate. By introducing air from the bottom, a fluidized bed layer is formed to achieve efficient drying of sodium sulfate.

[0024] Moist and hot exhaust gases generally cannot be used directly. They contain a large amount of moisture, which results in extremely poor drying effect when applied directly to sodium sulfate.

[0025] In some embodiments, please refer to Figure 3 and Figure 4 The heat exchange unit 340 includes multiple heat exchange tubes 341, with both ends of each tube connected to an airflow passage 330. The heat exchange tubes 341 are housed within an encapsulation box 310. The encapsulation box 310 is connected to the middle of a liquid flow passage 320. The heat exchange tubes 341 are immersed in the heat transfer medium. The parallel arrangement of multiple heat exchange tubes 341 significantly increases the contact area between the gas and the heat transfer medium. Simultaneously, the encapsulation box 310 maintains complete immersion of the tubes, preventing localized dry burning or uneven medium distribution that could lead to a decrease in heat exchange efficiency. The heat exchange tubes 341 also improve gas preheating efficiency, ensuring a uniform and stable gas temperature entering the bed 110. In practical implementation, the heat exchange tube 341 is a metal tubular structure open at both ends, which can be made of copper or aluminum alloy. Its wall thickness can be 0.5-2 mm, and its diameter can be 20-50 mm. It connects to the airflow passage 330 at both ends to form a gas flow channel. The encapsulation box 310 is a sealed box-shaped container, which can be made of welded stainless steel. Its internal space is designed to hold the heat transfer medium. The side wall or bottom of the box is connected to the liquid flow path 320 through flange interfaces to ensure that the heat transfer medium maintains a certain liquid level within the box. The liquid flow path 320 is a circulation pipeline connecting the liquid storage tank 210 and the encapsulation box 310. It can be made of metal pipe with an insulation layer, and the inner diameter of the pipe can be 50-100 mm. A pumping device drives the heat transfer medium to circulate between the liquid storage tank 210 and the encapsulation box 310. The airflow passage 330 is a ventilation duct that connects the air inlet 111 to the atmosphere. It can be implemented using galvanized steel pipe or PVC pipe with an inner diameter of 100-200 mm. The gas is driven to flow in the heat exchange tube 341 by the exhaust fan 120.

[0026] Gas in the airflow passage 330 enters the heat exchange tube 341 under suction. Since the heat exchange tube 341 is immersed in the heat-conducting medium in the encapsulation box 310, the gas exchanges heat with the heat-conducting medium through the tube wall during its flow. During the circulation of the heat-conducting medium in the liquid flow passage 320, heat is transferred from the liquid storage tank 210 to the encapsulation box 310, or vice versa, thereby achieving gas preheating or waste heat recovery. The encapsulation box 310 and the liquid storage tank 210 form a closed loop through the liquid flow passage 320, ensuring that the heat-conducting medium continuously participates in the heat exchange process.

[0027] In some embodiments, please refer to Figure 4 The heat exchange tube body 341 is provided with spiral fins 342 for heat conduction on its exterior. The inner side of the spiral fins 342 is fixedly connected to the outer wall of the heat exchange tube body 341. The spiral fins 342, through their continuously extending curved surface structure, multiply the contact area within a limited space. At the same time, the spiral direction guides the uniform flow of the medium, effectively eliminating local temperature gradients and avoiding a decrease in heat exchange efficiency due to medium stratification.

[0028] In practical implementation, the spiral fins 342 are thin metal sheets that continuously extend around the outer surface of the heat exchange tube 341. They can be made of aluminum or copper and formed through rolling or welding processes. By increasing the contact area between the heat exchange tube 341 and the heat transfer medium, the heat transfer efficiency is improved. The fixed connection is a gapless physical bond between the spiral fins 342 and the heat exchange tube 341. This can be achieved using high-frequency welding or integral casting processes to ensure that heat can be directly transferred through the metal contact surface.

[0029] Specifically, the spiral fins 342 form a continuous spiral protrusion structure on the surface of the heat exchange tube 341. When the heat transfer medium flows within the encapsulation box 310, the spiral fins 342 expand the contact area between the heat exchange tube 341 and the heat transfer medium to several times the original outer surface area of ​​the tube. In the airflow passage 330, when the low-temperature gas from the atmosphere flows through the interior of the heat exchange tube 341, its heat is rapidly transferred to the externally flowing heat transfer medium through the tube wall and the spiral fins 342, thereby improving the gas preheating efficiency. The continuous spiral structure of the spiral fins 342 can guide the heat transfer medium to form turbulence, preventing the formation of a stagnant layer on the tube surface and further enhancing the heat exchange effect.

[0030] In some embodiments, please refer to Figure 1 and Figure 5 The fluidized bed dryer 100 also includes an exhaust fan 120, the input end of which is connected to one end of the airflow channel, and the output end of which is connected to the air inlet 111. The exhaust fan 120 establishes a forced airflow circulation system to ensure that the gas enters the bed 110 at a constant flow rate, so that the particles are evenly dispersed and in a continuous state of motion, ensuring high speed and stability of the drying airflow.

[0031] In practical implementation, the exhaust fan 120 is a device that forces gas flow through mechanical power. It can be a centrifugal fan or an axial fan. Its input end is connected to the airflow channel to extract external gas, and its output end is connected to the air inlet 111 to guide the gas into the bed 110. The airflow channel is the path for gas flow within the heat exchange component 300, and can be implemented using metal pipes or high-temperature resistant plastic pipes. It connects to the input end of the exhaust fan 120 to form a gas circulation loop. The air inlet 111 is a gas inlet opened on the side wall of the bed 110, and can be implemented using a circular or rectangular opening structure. It connects to the output end of the exhaust fan 120 to receive preheated gas.

[0032] When the exhaust fan 120 is running, it draws external gas from the airflow channel. After being preheated by the heat exchange component 300, the gas enters the bed 110 through the air inlet 111. The forced airflow of the exhaust fan 120 creates a stable flow of gas within the bed 110, promoting the boiling state of the sodium sulfate granules and preventing granule accumulation due to insufficient airflow. During the gas circulation process, heat is recovered and reused through the heat exchange component 300, while the continuous operation of the exhaust fan 120 maintains the pressure balance between the airflow channel and the bed 110.

[0033] In some embodiments, the heat absorption assembly 200 further includes a bubble generator disposed in the liquid storage tank 210, and the bubble generator is connected to the gas outlet 112 via a pipe. The bubble generator converts the continuously flowing waste gas into fine bubbles, which increase the contact area with the heat-conducting medium, promote the speed at which the waste gas releases heat to the heat-conducting medium, and ensure the fixation and recovery of heat.

[0034] In practical implementation, the bubble generator is a device used to disperse gas into tiny bubbles, which can be implemented using a porous ceramic plate or a microporous metal tube, thereby accelerating heat transfer by increasing the gas-liquid contact area. The bubble generator is also a device for introducing hot air into the liquid storage tank 210, which can be implemented using a venturi tube or a pressure nozzle structure, and a gas delivery channel is formed by connecting the air outlet 112 and the liquid storage tank 210 through a pipe.

[0035] When the hot air discharged from the fluidized bed dryer 100 enters the liquid storage tank 210 through the pipeline, the bubble generator delivers the high-temperature gas to the bubble generator. The bubble generator disperses the gas into a dense cluster of microbubbles, creating a gas-liquid two-phase turbulent flow inside the heat transfer medium, thereby increasing the heat exchange efficiency by expanding the gas-liquid contact interface area. The heated heat transfer medium is then transported to the heat exchange unit 340 through the liquid flow path 320, transferring heat to the intake airflow and achieving intake air preheating.

[0036] In some embodiments, please refer to Figure 1 and Figure 5 A feeder 130 is installed above the bed 110. The feeder 130 can control the feeding speed of the bed 110, so that the feeding amount is dynamically matched with the drying conditions. This effectively suppresses the agglomeration phenomenon caused by local accumulation or excessive moisture of materials, reduces the probability of bed failure, thereby reducing the number of equipment cleanings and improving the stability of continuous operation of the production line.

[0037] In the specific implementation process, the feeder 130 is a device used to convey materials to the drying bed. It can be implemented using a screw conveyor or a vibrating feeder. Its function is to evenly disperse the sodium sulfate within the bed 110, preventing uneven heating due to localized accumulation. The feeder 130 can adjust the material conveying speed to adapt to drying conditions. This can be achieved using a variable frequency motor or a speed control valve. Its function is to dynamically adjust the feed rate based on the material's moisture content and the temperature of the bed 110, preventing excessive material accumulation and clumping.

[0038] The feeder 130 continuously feeds sodium sulfate into the bed 110 via a conveying mechanism. The conveying rate is adjusted by a control unit in conjunction with drying parameters. For example, when a decrease in the internal temperature of the bed 110 or an increase in airflow resistance is detected, the feeding speed can be automatically slowed down, allowing the material to be fully dispersed within the bed 110 and come into contact with hot air, preventing the agglomeration of undried particles due to excessively rapid feeding. Simultaneously, a guide vane or dispersing blade can be installed at the outlet of the feeder 130 to further ensure that the material is evenly spread on the surface of the bed 110, reducing the formation of locally overly wet areas.

[0039] In some embodiments, please refer to Figure 5 The bed body 110 is equipped with a discharge pipe 140 below it. By setting a closed discharge pipe 140, the flow rate of the material can be controlled and the output position of the material can be limited, thereby improving the continuity and stability of the drying bed operation and ensuring the continuous and efficient operation of the production line.

[0040] In the specific implementation process, the discharge pipe 140 is a pipe structure connected to the bottom of the bed 110. Specifically, it can be a metal pipe with a control valve, and the discharge rate of the dried product can be adjusted by opening and closing the control valve. The dried sodium sulfate is anhydrous sodium sulfate granules processed by the fluidized bed drying 100. Specifically, the moisture is evaporated through heat exchange between the airflow and the material, forming loose solid granules. The dried sodium sulfate falls naturally to the inlet of discharge pipe 140 under gravity. The material is then guided outward by the inclined angle of the inner wall of the pipe or by an additional screw conveyor. Discharge pipe 140 adopts a sealed structure design to prevent backflow of external air and turbulent airflow inside bed 110. At the same time, the discharge speed is regulated by a control valve to ensure that the dried material is discharged continuously and evenly, preventing local agglomeration due to accumulation.

[0041] In some embodiments, please refer to Figure 1 A filter 150 for filtering dust is provided between the air outlet 112 and the liquid storage tank 210. The filter 150 separates dust before the gas enters the liquid storage tank 210, which maintains the cleanliness of the heat transfer medium and reduces the problem of increased thermal resistance in the heat exchange unit 340 caused by dust accumulation.

[0042] In practical implementation, filter 150 is a device used to separate solid particles from the gas. It can be implemented using porous materials or fiber laminated structures, such as a bag filter 150 or a ceramic filter 150. Its function is to intercept dust particles carried in hot air, preventing dust from entering the liquid storage tank 210 and contaminating the heat transfer medium. The dust consists of tiny solid particles generated during the drying process of sodium sulfate, specifically including sodium sulfate crystals that detach during drying and impurities. Its particle size can range from micrometers. Filtration prevents dust from depositing inside the liquid storage tank 210, which would reduce heat transfer efficiency.

[0043] When hot air discharged from the fluidized bed dryer 100 enters the pipeline through the outlet 112, the dust carried in the gas is first intercepted by the filter 150. The clean gas then flows into the liquid storage tank 210 to exchange heat with the heat transfer medium. The filter 150 is installed in the middle section of the pipeline between the outlet 112 and the liquid storage tank 210. When the gas flows through the filter medium, the dust is trapped on the surface of the filter 150, while the purified gas continues to enter the liquid storage tank 210 to release heat. This avoids dust from adhering to the surface of the heat exchange tube 341 after entering the liquid storage tank 210 with the airflow and forming a heat insulation layer, while also reducing the viscosity increase of the heat transfer medium in the liquid storage tank 210 due to impurities.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A nitrate drying bed, characterized in that, include: A fluidized bed drying bed, comprising a bed body and air inlets and outlets disposed on both sides of the bed body; A heat-absorbing component, comprising a liquid storage tank for storing a heat-conducting medium, wherein the air outlet is connected to the liquid storage tank via a pipe, and the heat-conducting medium is capable of absorbing heat from hot air; The heat exchange assembly includes an encapsulation box, a liquid flow path, an air flow path, and a heat exchange unit disposed in the encapsulation box. The two ends of the liquid flow path are respectively connected to the liquid storage tank, and the two ends of the air flow path are respectively connected to the air inlet and the atmosphere. The middle of the liquid flow path and the air flow path are connected by the heat exchange unit to preheat the gas input into the bed.

2. The nitrate drying bed according to claim 1, characterized in that, The heat exchange unit includes multiple heat exchange tubes, with both ends of the multiple heat exchange tubes connected to the airflow passage. The heat exchange tubes are disposed in the encapsulation box. The encapsulation box is connected to the middle of the liquid flow passage. The heat exchange tubes are immersed in the heat-conducting medium for heat exchange.

3. A nitrate drying bed according to claim 2, characterized in that, The heat exchange tube body is provided with spiral fins for heat conduction on its outer side, and the inner side of the spiral fins is fixedly connected to the outer wall of the heat exchange tube body.

4. A nitrate drying bed according to claim 1, characterized in that, The fluidized bed dryer also includes an exhaust fan, the input end of which is connected to one end of the airflow passage, and the output end of which is connected to the air inlet.

5. A nitrate drying bed according to claim 1, characterized in that, The heat absorption component also includes a bubble generator, which is disposed in the liquid storage tank and connected to the air outlet through a pipe. The bubble generator can promote the heat absorption of the heat transfer medium.

6. A nitrate drying bed according to claim 1, characterized in that, A feeder is installed above the bed, and the feeder can control the feeding speed of the bed.

7. A nitrate drying bed according to claim 1, characterized in that, The bed is equipped with a discharge pipe at the bottom, which can output dried sodium sulfate.

8. A nitrate drying bed according to claim 1, characterized in that, A filter for filtering dust is provided between the air outlet and the liquid storage tank.

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