Energy-saving efficient calcium oxide powder drying equipment

Abstract

The utility model relates to dry equipment technical field, concretely relates to a kind of energy-saving efficient calcium oxide powder drying equipment, including rotary flash drying mechanism and vacuum disc dryer, rotary flash drying mechanism includes pulverization drying tower, hot air component, screw feeder and cyclone separator, vacuum disc dryer includes the feed inlet at its top, cyclone separator includes the discharge outlet at its bottom, the discharge outlet is connected with reversing valve, reversing valve is connected with finished product pipeline and re-drying pipeline respectively, finished product pipeline is connected with finished product collection bin, re-drying pipeline is connected with feed inlet;Cyclone separator includes the exhaust port on the outer circumferential surface at its top, the exhaust port is connected with energy-saving recovery mechanism, energy-saving recovery mechanism includes heat energy export and waste gas discharge port, heat energy export is connected with the air inlet of hot air component.The utility model adds vacuum disc dryer, adapts two kinds of production needs, production efficiency is high, product quality is high, and waste gas waste heat recovery can be realized.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, specifically to an energy-saving and high-efficiency calcium oxide powder drying equipment. Background Technology

[0002] Calcium oxide powder, as an important inorganic chemical raw material, is widely used in construction, metallurgy, environmental protection, and other fields. In its production process, drying is a crucial step in ensuring product quality. Incomplete drying can cause calcium oxide to absorb moisture and clump, affecting its subsequent performance; excessive drying, on the other hand, will increase energy consumption and production costs.

[0003] Currently, the drying of calcium oxide powder is mostly carried out using rotary flash drying equipment. This equipment achieves rapid drying by ensuring full contact between hot air and the material in the pulverizing and drying tower, and then uses a cyclone separator to separate and collect the dried material.

[0004] However, in fields such as pharmaceuticals and food, where the purity of calcium oxide powder is extremely high, its moisture content must be strictly controlled to 0.5% or below. When processing calcium oxide powder with high moisture content or uneven particle size using a single rotary flash dryer, some materials may not reach the required drying level due to insufficient contact with hot air, making it difficult to meet the demand for low-moisture, fine-grained drying. These substandard materials typically require manual screening and re-feeding to the drying equipment for secondary processing. This not only increases labor costs but also poses a risk of secondary contamination and results in low overall processing efficiency. Simultaneously, during the drying process, the exhaust gas from the cyclone separator carries a significant amount of waste heat. Existing equipment often directly discharges this hot exhaust gas to the outside, resulting in a serious waste of thermal energy and a substantial increase in energy costs during hot air preparation. Utility Model Content

[0005] To address the technical problem that using a single rotary flash dryer results in poor drying of calcium oxide powder with high moisture content or uneven particle size, making it difficult to meet the low moisture content requirements of pharmaceutical and food-grade calcium oxide powder, requiring manual screening and re-feeding into the drying equipment, resulting in low processing efficiency, and that the exhaust gas discharged from the cyclone separator carries a large amount of residual heat, which would lead to a waste of thermal energy if directly discharged, this utility model provides an energy-saving and efficient calcium oxide powder drying device.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An energy-efficient and high-performance calcium oxide powder drying device includes a rotary flash drying mechanism. The rotary flash drying mechanism includes a pulverizing and drying tower, which has a hot air inlet and a feeding port on its bottom outer surface. The hot air inlet is connected to the hot air outlet of a hot air component, and the feeding port is connected to the discharge port of a screw feeder. The pulverizing and drying tower also includes an air outlet on its top outer surface, which is connected to a tangential air inlet at the top of a cyclone separator. The device also includes a vacuum disc dryer, which has a feeding port at its top. The cyclone separator has an outlet at its bottom, which is connected to a reversing valve. The reversing valve is connected to a finished product pipeline and a re-drying pipeline, respectively. The finished product pipeline is connected to a finished product collection bin, and the re-drying pipeline is connected to the feeding port. The cyclone separator also includes an exhaust port on its top outer surface, which is connected to an energy-saving recovery mechanism. The energy-saving recovery mechanism includes a heat energy outlet and a waste gas emission outlet, with the heat energy outlet connected to the air inlet of the hot air component.

[0008] By adopting the above structural design, this utility model adds a vacuum disc dryer to the rotary flash drying mechanism. This allows the material separated by the cyclone separator to selectively enter either the finished product pipeline or the re-drying pipeline via a reversing valve, adapting to two production needs. When producing ordinary grade calcium oxide powder, the reversing valve switches to the finished product pipeline, and the material is directly collected after rotary flash drying and cyclone separation, resulting in high production efficiency and low energy consumption. When producing pharmaceutical and food-grade calcium oxide powder, the reversing valve switches to the re-drying pipeline, allowing the material to enter the vacuum disc dryer for secondary drying. This solves the problem of incomplete drying caused by single rotary flash drying, meeting the stringent requirements for low moisture content in pharmaceutical and food-grade calcium oxide powder. It eliminates the need for manual screening and rework, improving the production efficiency of pharmaceutical and food-grade calcium oxide powder and avoiding secondary pollution. Simultaneously, the energy-saving recovery mechanism recycles the waste heat from the cyclone separator's exhaust gas for use in the hot air components, reducing energy consumption in hot air preparation, achieving energy savings, and improving the overall energy efficiency of the equipment.

[0009] As a preferred method for energy-saving and efficient calcium oxide powder drying equipment, the re-drying pipeline is connected to the feed port through an inclined conveyor, and a movable frame is provided at the bottom of the inclined conveyor.

[0010] With the above structural design, the re-drying pipeline is connected to the inlet of the vacuum disc dryer via an inclined conveyor, which is compatible with the high-level feeding requirements of the vacuum disc dryer, ensuring smooth conveying of substandard materials and avoiding stagnation or blockage. The movable frame at the bottom of the inclined conveyor can be flexibly adjusted to enhance the adaptability of the equipment during installation and maintenance and improve the convenience of operation.

[0011] As a preferred implementation of an energy-saving and efficient calcium oxide powder drying equipment, the energy-saving recovery mechanism includes a bag filter and a heat exchanger. The bag filter includes an ash inlet and a dust removal outlet, with the ash inlet connected to the exhaust outlet. The heat exchanger includes a hot flow inlet and a cold flow inlet located on one side of it. The hot flow inlet is connected to the dust removal outlet, and the cold flow inlet is connected to a fresh gas delivery pipeline. The heat energy outlet and the exhaust gas outlet are located on the other side of the heat exchanger.

[0012] With the above structural design, in the energy-saving recovery mechanism, the bag filter first removes dust from the exhaust gas discharged from the cyclone separator to prevent dust from contaminating the heat exchanger, ensuring heat exchange efficiency and extending equipment life; the heat exchanger recovers waste heat to the hot air component through heat exchange between the exhaust gas and the fresh gas, reducing the energy consumption of hot air preparation and improving energy-saving effect.

[0013] As a preferred implementation of an energy-saving and efficient calcium oxide powder drying equipment, the exhaust gas outlet is connected to a dust control mechanism. The dust control mechanism includes an induced draft fan and an activated carbon adsorption tower. The induced draft fan includes an induced draft inlet and an induced draft outlet, and the induced draft inlet is connected to the exhaust gas outlet. The activated carbon adsorption tower includes an exhaust gas inlet and an exhaust chimney, and the exhaust gas inlet is connected to the induced draft outlet.

[0014] With the above structural design, the exhaust fan connected to the exhaust outlet provides power for the flow of exhaust gas, ensuring smooth waste heat recovery and emission processes; the activated carbon adsorption tower deeply purifies the exhaust gas, removing residual dust and harmful substances, so that the exhaust gas meets emission standards, reduces environmental pollution, and meets environmental protection requirements.

[0015] As a preferred implementation of an energy-saving and efficient calcium oxide powder drying equipment, the pulverizing and drying tower includes a vertically arranged rotating shaft inside it. Several pulverizing blades are installed on the outer periphery of the rotating shaft. The several pulverizing blades are arranged in multiple layers along the axial direction of the rotating shaft, and each layer of pulverizing blades is distributed around the circumferential direction of the rotating shaft. The bottom end of the rotating shaft is connected to the output end of the main shaft drive motor, which is located outside the pulverizing and drying tower.

[0016] With the above structural design, the multi-layered, circumferentially distributed pulverizing blades inside the pulverizing and drying tower can fully pulverize and disperse agglomerated or unevenly sized calcium oxide powder under the drive of the rotating shaft, increasing the contact area between the material and the hot air, and improving the uniformity and efficiency of the initial drying; the main shaft drive motor is located outside the pulverizing and drying tower to avoid direct contact with the high temperature and dust environment inside the tower, thus extending the service life of the motor.

[0017] As a preferred implementation of an energy-saving and efficient calcium oxide powder drying equipment, a number of reverse flow guide plates are fixedly installed inside the pulverizing and drying tower. The reverse flow guide plates are arranged in multiple layers in the vertical direction, and each layer of reverse flow guide plates is distributed at intervals along the circumferential direction of the pulverizing and drying tower. The reverse flow guide plates are staggered with the pulverizing blades in the vertical direction. The reverse flow guide plates are curved plate-shaped structures, and the bending direction of the reverse flow guide plates is opposite to the rotation direction of the rotating shaft.

[0018] With the above-mentioned structural design, the reverse guide plate and crushing blades in the crushing and drying tower are staggered and the bending direction is opposite to the rotation axis. This can change the material movement trajectory, create disturbance and prolong the residence time of the material in the tower, enhance the turbulent contact between the material and the hot air, avoid insufficient drying of local materials due to excessive flow velocity, and further improve the drying uniformity.

[0019] As a preferred implementation of an energy-saving and efficient calcium oxide powder drying equipment, the equipment includes a controller, a pulverizing and drying tower including a negative pressure port on its top outer circumference, the negative pressure port being connected to a negative pressure suction machine, a gas pressure sensor being installed inside the pulverizing and drying tower, and the controller being electrically connected to the gas pressure sensor, the negative pressure suction machine, and the main shaft drive motor.

[0020] By adopting the above structural design, firstly, during the drying process, calcium oxide powder easily forms dust. The negative pressure state makes the air pressure inside the pulverizing and drying tower lower than the outside atmospheric pressure, causing air to flow from the outside into the chamber instead of dust leaking out, fundamentally avoiding environmental pollution and raw material waste caused by dust overflowing through equipment gaps. Secondly, the suction force generated by the negative pressure can assist the material to move along the preset path of bottom feeding and top discharge within the pulverizing and drying tower, especially for highly viscous calcium oxide powder, reducing the risk of accumulation in the screw feeder. Thirdly, a suitable negative pressure, such as -2 to -5 kPa, will guide the hot airflow to form a spiral upward flow field within the pulverizing and drying tower. This, combined with the rotation of the pulverizing blades, allows for more thorough contact between the hot air and the material particles. At the same time, the boiling point of water evaporates faster as the air pressure decreases, and the negative pressure environment accelerates the evaporation rate of moisture on the material surface, which can shorten the drying time. Fourth, the controller will link the gas pressure sensor, negative pressure suction machine, and main shaft drive motor to monitor and adjust the pressure inside the pulverizing and drying tower in real time, maintaining a stable negative pressure environment. When the negative pressure is insufficient, the suction force of the negative pressure suction machine will be increased; when the absolute value of the negative pressure is too high, the speed of the main shaft drive motor will be reduced and the suction force of the negative pressure suction machine will be decreased. Fifth, the stable negative pressure state ensures a uniform flow of waste gas entering the energy-saving recovery mechanism, improving the waste gas treatment effect.

[0021] As a preferred method for energy-saving and efficient calcium oxide powder drying equipment, the pulverizing and drying tower is equipped with temperature and humidity sensors, and the controller is electrically connected to the temperature sensor, humidity sensor, gas pressure sensor, hot air component and screw feeder.

[0022] With the above structural design, the temperature and humidity sensors inside the pulverizing and drying tower are linked with the controller to provide real-time feedback on the environmental parameters inside the tower. Based on this, the controller adjusts the heat output of the hot air components and the feeding speed of the screw feeder to dynamically optimize the drying conditions, ensuring that the material is dried to the target moisture content. This avoids excessive energy consumption due to over-drying or poor quality due to insufficient drying, thereby improving the stability of product quality.

[0023] As a preferred implementation of an energy-saving and efficient calcium oxide powder drying equipment, the hot air component includes a blower, an electric heating tube heater, and a steam heater. The blower, electric heating tube heater, and steam heater are connected by a three-way valve, and the electric heating tube heater and steam heater are connected to the hot air inlet through a three-way pipe.

[0024] With the above structural design, the electric heating tube heater and the steam heater can be switched using a three-way valve, allowing for flexible selection of the heating method based on the energy supply situation. This reduces dependence on a single energy source, prioritizes the use of low-cost energy when steam is plentiful, reduces heating energy consumption, and ensures a stable supply of hot air to guarantee continuous drying.

[0025] As a preferred method for energy-saving and efficient calcium oxide powder drying equipment, the outer shell of the pulverizing and drying tower and the cyclone separator is a double-layer shell, with the inner layer being fiberboard and the outer layer being color steel plate.

[0026] The above-mentioned structural design incorporates a double-layer shell consisting of an inner fiberboard layer and an outer color steel plate layer. The inner fiberboard layer reduces heat loss within the tower, thereby lowering energy consumption. The outer color steel plate layer enhances the structural strength and corrosion resistance of the equipment, extending its service life. Simultaneously, it maintains stable temperature within the tower, reducing the impact of ambient temperature fluctuations on drying efficiency.

[0027] The beneficial effects of this utility model include:

[0028] This invention adds a vacuum disc dryer to the rotary flash drying mechanism, allowing the material separated by the cyclone separator to selectively enter either the finished product pipeline or the re-drying pipeline via a reversing valve, adapting to two production needs. When producing ordinary grade calcium oxide powder, the reversing valve switches to the finished product pipeline, and the material is directly collected after rotary flash drying and cyclone separation, resulting in high production efficiency and low energy consumption. When producing pharmaceutical and food-grade calcium oxide powder, the reversing valve switches to the re-drying pipeline, allowing the material to undergo secondary drying in the vacuum disc dryer. This solves the problem of incomplete drying in single rotary flash drying, meeting the stringent low moisture content requirements of pharmaceutical and food-grade calcium oxide powder, eliminating the need for manual screening and rework, improving the production efficiency of pharmaceutical and food-grade calcium oxide powder, and avoiding secondary pollution. Simultaneously, the energy-saving recovery mechanism recycles the waste heat from the cyclone separator exhaust gas for use in the hot air components, reducing energy consumption in hot air preparation, achieving energy savings, and improving the overall energy efficiency of the equipment. Attached Figure Description

[0029] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an energy-saving and high-efficiency calcium oxide powder drying device according to a specific embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the energy-saving recycling mechanism in a specific embodiment of this utility model;

[0032] Figure 3 This is a schematic diagram of the internal structure of the pulverizing and drying tower in a specific embodiment of this utility model;

[0033] Figure 4 This is a top view of the pulverizing and drying tower in a specific embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the hot air component in a specific embodiment of the present invention.

[0035] List of components and reference numerals:

[0036] 1. Rotary flash drying mechanism; 11. Crushing and drying tower; 111. Hot air inlet; 112. Feed port; 113. Defective product discharge port; 114. Air outlet; 115. Negative pressure port; 12. Hot air components; 121. Blower; 122. Electric heating tube heater; 123. Steam heater; 124. Three-way valve; 125. Three-way pipe; 126. Hot air outlet; 127. Air inlet; 13. Screw feeder; 131. Discharge port; 132. Feed hopper; 14. Cyclone separator; 141. Tangential air inlet; 142. Exhaust port; 143. Discharge port; 2. Vacuum disc dryer; 21. Feed port; 3. Reversing valve; 4. Finished product pipeline; 5. Re-drying pipeline; 6. Finished product collection bin; 7. Energy-saving recovery machine Structure; 71. Baghouse dust collector; 711. Ash inlet; 712. Dust outlet; 72. Heat exchanger; 721. Hot flow inlet; 722. Cold flow inlet; 723. Heat outlet; 724. Exhaust gas outlet; 73. Fresh gas conveying pipeline; 8. Inclined conveyor; 9. Moving frame; 10. Dust control mechanism; 101. Exhaust fan; 1011. Exhaust air inlet; 1012. Exhaust air outlet; 102. Activated carbon adsorption tower; 1021. Exhaust gas inlet; 1022. Exhaust chimney; 011. Rotating shaft; 012. Crushing blades; 013. Main shaft drive motor; 014. Reverse guide plate; 015. Negative pressure suction machine; 016. Gas pressure sensor; 017. Temperature sensor; 018. Humidity sensor. Detailed Implementation

[0037] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Reference Figure 1-5 This embodiment proposes an energy-saving and efficient calcium oxide powder drying equipment, including a rotary flash drying mechanism 1, a vacuum disc dryer 2, an energy-saving recovery mechanism 7, a dust control mechanism 10, and a controller.

[0039] The rotary flash drying unit 1 includes a pulverizing and drying tower 11, a hot air component 12, a screw feeder 13, and a cyclone separator 14. The outer shells of the pulverizing and drying tower 11 and the cyclone separator 14 are double-layer shells, with the inner layer being fiberboard and the outer layer being color steel plate. The pulverizing and drying tower 11 includes a hot air inlet 111, a feeding port 112, and a defective product discharge port 113 on the outer circumferential surface of its bottom. The hot air inlet 111 is connected to the hot air outlet 126 of the hot air component 12. The feeding port 112 is connected to the discharge port 131 of the screw feeder 13. The defective product discharge port 113 is connected to the feeding hopper 132 of the screw feeder 13. In order to ensure smooth material conveying, a solid material conveying pump or other suitable solid material conveying mechanism can be set on the path from the defective product discharge port 113 to the feeding hopper 132. For the sake of clarity, the connection structure between the defective product discharge port 113 and the feeding hopper 132 of the screw feeder 13 is not shown in the figure. However, those skilled in the art should understand how to make the material discharged from the defective product discharge port 113 enter the feeding hopper 132 of the screw feeder 13. The hot air component 12 includes a blower 121, an electric heating element heater 122, and a steam heater 123. The blower 121, the electric heating element heater 122, and the steam heater 123 are connected by a three-way valve 124. The electric heating element heater 122 and the steam heater 123 are connected to the hot air inlet 111 via a three-way pipe 125. The pulverizing and drying tower 11 includes an air outlet 114 on its top outer circumference, which is connected to the tangential air inlet 141 at the top of the cyclone separator 14.

[0040] The vacuum disc dryer 2 includes a feed inlet 21 at its top, and the cyclone separator 14 includes a discharge outlet 143 at its bottom. The discharge outlet 143 is connected to a reversing valve 3. The reversing valve 3 is connected to the finished product pipeline 4 and the re-drying pipeline 5 respectively. The finished product pipeline 4 is connected to the finished product collection bin 6. The re-drying pipeline 5 is connected to the feed inlet 21 through an inclined conveyor 8. The bottom of the inclined conveyor 8 is provided with a movable frame 9.

[0041] The cyclone separator 14 includes an exhaust port 142 on its top outer peripheral surface. The energy-saving recovery mechanism 7 includes a bag filter 71 and a heat exchanger 72. The bag filter 71 includes an ash inlet 711 and a dust removal outlet 712. The ash inlet 711 is connected to the exhaust port 142. The heat exchanger 72 includes a hot flow inlet 721 and a cold flow inlet 722 on one side. The hot flow inlet 721 is connected to the dust removal outlet 712. The cold flow inlet 722 is connected to the fresh gas delivery pipe 73. The heat exchanger 72 includes a heat energy outlet 723 and a waste gas discharge port 724 on the other side. The heat energy outlet 723 is connected to the air inlet 127 of the hot air component 12.

[0042] The exhaust outlet 724 is connected to the dust control mechanism 10. The dust control mechanism 10 includes an induced draft fan 101 and an activated carbon adsorption tower 102. The induced draft fan 101 includes an induced draft inlet 1011 and an induced draft outlet 1012. The induced draft inlet 1011 is connected to the exhaust outlet 724. The activated carbon adsorption tower 102 includes an exhaust gas inlet 1021 and an exhaust chimney 1022. The exhaust gas inlet 1021 is connected to the induced draft outlet 1012.

[0043] The pulverizing and drying tower 11 includes a vertically arranged rotating shaft 011 inside it. Several pulverizing blades 012 are installed on the outer periphery of the rotating shaft 011. The several pulverizing blades 012 are arranged in multiple layers along the axial direction of the rotating shaft 011, and each layer of pulverizing blades 012 is distributed around the circumferential direction of the rotating shaft 011. The bottom end of the rotating shaft 011 is connected to the output end of the main shaft drive motor 013, which is located outside the pulverizing and drying tower 11. Figure 4 The arrow X in the diagram indicates the direction of rotation of axis 011.

[0044] The pulverizing and drying tower 11 is internally equipped with several counter-flow guide plates 014. These counter-flow guide plates 014 are arranged in multiple layers vertically, with each layer spaced apart along the circumferential direction of the tower. The counter-flow guide plates 014 are staggered with the pulverizing blades 012 in the vertical direction. Each counter-flow guide plate 014 has a curved plate-like structure, and the curvature direction of the counter-flow guide plate 014 is opposite to the rotation direction of the rotating shaft 011. Specifically, the surface of the counter-flow guide plate 014 can be inclined relative to the radial surface of the rotating shaft 011 at an angle of 20° to 35° (including 20° and 35°). When inclined, the top of the counter-flow guide plate 014 is closer to the center of the pulverizing and drying tower 11, thus better adapting to the flow direction of the spiraling upward airflow.

[0045] The pulverizing and drying tower 11 includes a negative pressure port 115 on its top outer circumference, which is connected to a negative pressure suction machine 015. A gas pressure sensor 016 is installed inside the pulverizing and drying tower 11. A controller is electrically connected to the gas pressure sensor 016, the negative pressure suction machine 015, and the main shaft drive motor 013. A temperature sensor 017 and a humidity sensor 018 are also installed inside the pulverizing and drying tower 11. The controller is electrically connected to the temperature sensor 017, the humidity sensor 018, the gas pressure sensor 016, the hot air component 12, and the screw feeder 13.

[0046] Work process:

[0047] Start the controller and set target parameters according to production needs, such as moisture content, drying temperature, negative pressure range inside the tower, etc. Temperature sensor 017, humidity sensor 018, and gas pressure sensor 016 monitor the environment inside the pulverizing and drying tower 11 in real time. The controller links the hot air component 12 and the screw feeder 13 to adjust the hot air temperature, air volume, and feeding rate in advance.

[0048] The hot air component 12 switches the heating mode through the three-way valve 124. When there is enough steam, the steam heater 123 is activated first; otherwise, the electric heating tube heater 122 is switched. The blower 121 sends the heated hot air into the pulverizing and drying tower 11 through the hot air inlet 111 to provide a heat source for drying.

[0049] The screw feeder 13 feeds the calcium oxide powder to be dried into the pulverizing and drying tower 11 through the feed port 112. Inside the pulverizing and drying tower 11, the main shaft drive motor 013 drives the vertical rotating shaft 011 and the outer multi-layer pulverizing blades 012 to rotate at high speed, which fully pulverizes and disperses the agglomerated or unevenly sized material; at the same time, the multi-layer reverse guide plates 014 fixed inside the tower change the material movement trajectory, prolong its residence time in the tower, enhance the turbulent contact with hot air, and achieve rapid and uniform preliminary drying.

[0050] The controller monitors the pressure inside the tower through the gas pressure sensor 016 and links the negative pressure suction machine 015 to maintain a stable negative pressure, which not only prevents dust from overflowing but also accelerates moisture evaporation. At the same time, it works with the blower 121 to ensure that the hot airflow forms a spiral upward flow field, thereby improving drying efficiency.

[0051] After preliminary drying, the mixture of material and waste gas enters the cyclone separator 14 from the top outlet 114 of the pulverizing and drying tower 11. Under the action of centrifugal force, gas-solid separation is achieved. Calcium oxide powder is discharged from the bottom outlet 143 due to gravity, and hot waste gas is discharged from the top exhaust outlet 142.

[0052] When producing ordinary grade calcium oxide powder, the reversing valve 3 switches to the finished product pipeline 4. The material separated by the cyclone separator directly enters the finished product collection bin 6 through the finished product pipeline 4, completing the production of ordinary grade products. When producing pharmaceutical and food grade calcium oxide powder, the reversing valve 3 switches to the re-drying pipeline 5. The material separated by the cyclone separator enters the inclined conveyor 8 through the re-drying pipeline 5, and is then conveyed by the inclined conveyor 8 to the feed inlet 21 at the top of the vacuum disc dryer 2. The vacuum disc dryer 2 utilizes the vacuum environment to lower the boiling point of water, performing deep drying of the material at low temperature to ensure a final moisture content ≤0.5%, meeting the low moisture content requirements for pharmaceutical and food grades. The material after secondary drying is discharged from the vacuum disc dryer 2, completing the production of pharmaceutical and food grade products.

[0053] The exhaust gas discharged from the cyclone separator 14 enters the energy-saving recovery mechanism 7 through the exhaust port 142: first, the dust in the exhaust gas is removed by the bag filter 71, and then it enters the heat exchanger 72 to exchange heat with the new gas introduced by the cold flow inlet 722, using the waste heat of the exhaust gas to preheat the new gas.

[0054] The preheated fresh gas enters the hot air component 12 through the heat energy outlet 723, and the cooled exhaust gas enters the dust control mechanism 10 through the exhaust gas outlet 724. The exhaust fan 101 draws the exhaust gas to the activated carbon adsorption tower 102, and after deep purification of residual pollutants, it is discharged through the exhaust chimney 1022 to meet the standards.

[0055] The bottom of the crushing and drying tower 11 is equipped with a defective product discharge port 113. If the material in the tower settles at the bottom of the tower due to insufficient drying or severe agglomeration, it can be sent back to the feeding hopper 132 of the screw feeder 13 through the defective product discharge port 113 via a solid material conveying pump or other suitable solid material conveying mechanism, and re-enter the drying process to reduce raw material waste.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy-saving and efficient calcium oxide powder drying device, comprising a rotary flash drying mechanism (1), the rotary flash drying mechanism comprising a pulverizing and drying tower (11), the pulverizing and drying tower (11) comprising a hot air inlet (111) and a feeding port (112) on the outer peripheral surface of its bottom, the hot air inlet (111) being connected to the hot air outlet (126) of the hot air component (12), the feeding port (112) being connected to the discharge port (131) of the screw feeder (13), the pulverizing and drying tower (11) comprising an air outlet (114) on the outer peripheral surface of its top, the air outlet (114) being connected to the tangential air inlet (141) at the top of the cyclone separator (14), characterized in that, It also includes a vacuum disc dryer (2), which includes a feed inlet (21) on its top and a cyclone separator (14) including a discharge outlet (143) on its bottom. The discharge outlet (143) is connected to a reversing valve (3), which is connected to the finished product pipeline (4) and the re-drying pipeline (5) respectively. The finished product pipeline (4) is connected to the finished product collection bin (6), and the re-drying pipeline (5) is connected to the feed inlet (21). The cyclone separator (14) includes an exhaust port (142) on its top outer peripheral surface. The exhaust port (142) is connected to an energy-saving recovery mechanism (7). The energy-saving recovery mechanism (7) includes a heat energy outlet (723) and a waste gas discharge port (724). The heat energy outlet (723) is connected to the air inlet (127) of the hot air component (12).

2. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 1, characterized in that, The re-drying pipeline (5) is connected to the feed inlet (21) via an inclined conveyor (8), and a movable frame (9) is provided at the bottom of the inclined conveyor (8).

3. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 1, characterized in that, The energy-saving recycling mechanism (7) includes a bag filter (71) and a heat exchanger (72). The bag filter (71) includes an ash inlet (711) and a dust removal outlet (712). The ash inlet (711) is connected to the exhaust outlet (142). The heat exchanger (72) includes a hot flow inlet (721) and a cold flow inlet (722) located on one side of it. The hot flow inlet (721) is connected to the dust removal outlet (712). The cold flow inlet (722) is connected to the fresh gas delivery pipeline (73). The heat energy outlet (723) and the exhaust gas outlet (724) are located on the other side of the heat exchanger (72).

4. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 3, characterized in that, The exhaust outlet (724) is connected to the dust control mechanism (10), which includes an induced draft fan (101) and an activated carbon adsorption tower (102). The induced draft fan (101) includes an induced draft inlet (1011) and an induced draft outlet (1012). The induced draft inlet (1011) is connected to the exhaust outlet (724). The activated carbon adsorption tower (102) includes an exhaust gas inlet (1021) and an exhaust chimney (1022). The exhaust gas inlet (1021) is connected to the induced draft outlet (1012).

5. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 1, characterized in that, The pulverizing and drying tower (11) includes a vertically arranged rotating shaft (011) inside it. Several pulverizing blades (012) are installed on the outer periphery of the rotating shaft (011). The several pulverizing blades (012) are arranged in multiple layers along the axial direction of the rotating shaft (011), and each layer of pulverizing blades (012) is distributed around the circumferential direction of the rotating shaft (011). The bottom end of the rotating shaft (011) is connected to the output end of the main shaft drive motor (013), and the main shaft drive motor (013) is located outside the pulverizing and drying tower (11).

6. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 5, characterized in that, The pulverizing and drying tower (11) is equipped with several reverse guide plates (014). The reverse guide plates (014) are arranged in multiple layers in the vertical direction, and each layer of reverse guide plates (014) is distributed at intervals along the circumferential direction of the pulverizing and drying tower (11). The reverse guide plates (014) are staggered with the pulverizing blades (012) in the vertical direction. The reverse guide plates (014) are curved plate-shaped structures, and the bending direction of the reverse guide plates (014) is opposite to the rotation direction of the rotating shaft (011).

7. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 5, characterized in that, The pulverizing and drying tower (11) includes a controller and a negative pressure port (115) on its top outer peripheral surface. The negative pressure port (115) is connected to a negative pressure suction machine (015). A gas pressure sensor (016) is provided inside the pulverizing and drying tower (11). The controller is electrically connected to the gas pressure sensor (016), the negative pressure suction machine (015), and the main shaft drive motor (013).

8. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 7, characterized in that, The crushing and drying tower (11) is equipped with a temperature sensor (017) and a humidity sensor (018). The controller is electrically connected to the temperature sensor (017), humidity sensor (018), gas pressure sensor (016), hot air component (12) and screw feeder (13).

9. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 1, characterized in that, The hot air component (12) includes a blower (121), an electric heating tube heater (122), and a steam heater (123). The blower (121), the electric heating tube heater (122), and the steam heater (123) are connected by a three-way valve (124). The electric heating tube heater (122) and the steam heater (123) are connected to the hot air inlet (111) by a three-way pipe (125).

10. The energy-saving and high-efficiency calcium oxide powder drying equipment according to claim 1, characterized in that, The outer shells of the pulverizing and drying tower (11) and the cyclone separator (14) are double-layer shells, with the inner layer being fiberboard and the outer layer being color steel plate.

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