A drum-type quicklime dewatering reactor and its application method

Abstract

This invention discloses a drum-type quicklime dewatering reactor, comprising a drum reaction unit, a feeding unit, a discharging unit, an air inlet unit, and an air outlet unit. The drum reaction unit is inclined, with its high end connected to the feeding unit and the air outlet unit, and its low end connected to the discharging unit and the air inlet unit. The drum reaction unit includes a main frame, a drum reaction chamber, and a central drive shaft. The drum reaction chamber is mounted on the main frame, and the central drive shaft is positioned along the axial direction within the drum reaction chamber. Driven by the central drive shaft, the drum reaction chamber rotates, thoroughly agitating the materials inside. This invention also discloses a method for using the above-mentioned reactor. This invention utilizes the reaction of granular quicklime with water containing moist gas to achieve the drying of circulating air in low-temperature evaporation technology. The phase motion generated by the drum rotation and the stirring rod disturbs the quicklime particles, thereby increasing the gas-solid contact area and reaction efficiency, enhancing the peeling of reaction products from the surface of the granular quicklime, and achieving continuous and efficient dewatering and drying.

Description

Technical Field

[0001] This invention relates to the field of dehydration technology for humid gases in low-temperature evaporation systems, and specifically to a rotary reactor for dehydrating quicklime particles, and a drum-type quicklime dehydration reactor and its usage method. Background Technology

[0002] As an important form of existing waste management, "urban mining" technology can not only eradicate existing waste pollution sources, but also realize the resource utilization of existing domestic waste and restore the land use function. Therefore, "urban mining" technology has received attention in China in the past ten years and has been widely used in engineering practice.

[0003] The efficiency and quality of resource recovery from excavated waste in "urban mining" technology are greatly affected by the moisture content of the materials. Current technologies typically reduce moisture content by open-air drying or drying in sheds; however, in areas with frequent rainfall, humid climates, or high leachate levels in landfills, it is difficult to reduce the moisture content of excavated materials to a suitable level (around 40%) through natural drying. Therefore, the development of moisture content control technology for excavated waste is particularly important and urgent.

[0004] Chinese patent CN201684542U discloses a lime drying tower that prevents condensation in subsequent pipelines and equipment while simultaneously heating, dehydrating, and deacidifying the flue gas. It effectively consumes moisture in the flue gas entering the tower through the exothermic reaction of quicklime and water, reducing the moisture content of the flue gas and simultaneously deacidifying it. However, this device utilizes both the exothermic reaction of quicklime and water and the reaction of quicklime with acidic gases for deacidification, resulting in the inability to further utilize the products and generating a large amount of solid waste. Furthermore, the bottom-up air intake method hinders the separation of products from quicklime, preventing efficient and continuous removal of moisture from the flue gas. Additionally, a relatively high reactor height is often required to improve dehydration efficiency.

[0005] Chinese Patent CN112717666A discloses a granular quicklime fixed bed dehydration and deodorization system and its operation method. It sets up a quicklime drying layer mainly composed of granular quicklime through a support screen on a strip support frame, and adopts a transverse air intake method to allow the circulating air to pass through the granular quicklime fixed bed to complete the dehydration and drying of the gas. A slag collection hopper is set below the drying layer to collect the impurities and residues remaining after the reaction. The heat released by the reaction is collected and recovered through heat exchange coils. Compared with the previous invention, this device uses granular quicklime and transverse air intake to improve the gas-solid reaction efficiency and achieves product separation through a screen. However, the following problems still exist: (1) The dehydration efficiency is not high (the dehydration efficiency of Example 1 is 33.3%, and the dehydration efficiency of Example 2 is 20%); (2) The generated hydrated lime is difficult to separate from the quicklime and impurities, resulting in low separation efficiency, and the particles are easy to clog and block the channels, resulting in increased air resistance; (3) At the same time, the reactor occupies a large area, and the reaction rate of quicklime in the front and rear sections is inconsistent. (4) In addition, the device can only be fed in batches, and the process of feeding can easily lead to the leakage of malodorous gas, causing secondary pollution. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a drum-type quicklime reactor. This reactor utilizes the reaction of granular quicklime with water containing moist gas to achieve drying via circulating air in low-temperature evaporation technology. The rotation of the drum and the phase motion generated by the fixed blades on the central shaft disturb the quicklime particles, thereby increasing the gas-solid contact area and reaction efficiency. This enhances the removal of reaction products from the surface of the granular quicklime, achieving continuous and efficient dehydration and drying with high dehydration efficiency. Simultaneously, the heat of reaction is recovered and utilized using the circulating gas between the drum walls.

[0007] The present invention also provides a method for using the above-mentioned drum-type quicklime reactor.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A drum-type quicklime dewatering reactor includes a drum reaction unit, a feeding unit, a discharging unit, an air inlet unit, and an air outlet unit. The drum reaction unit is inclined, with its high end connected to the feeding unit and the air outlet unit, and its low end connected to the discharging unit and the air inlet unit. The drum reaction unit includes a main frame, a drum reaction chamber, and a central drive shaft. The drum reaction chamber is mounted on the main frame, and the central drive shaft is arranged along the axial direction inside the drum reaction chamber. Driven by the central drive shaft, the drum reaction chamber rotates, thereby fully stirring and reacting the quicklime and the moist gas.

[0010] Furthermore, the drum reaction chamber includes an inner cylinder wall, an outer cylinder wall, a sieve plate, and a cross-shaped fixing frame; the inner cylinder wall rotates around the cylinder axis under the drive of the central drive main shaft; the outer cylinder wall is fixed on the main frame, and the hot circulating gas between the inner cylinder wall and the outer cylinder wall can be recovered and reused; a sieve plate is provided on the connection surface between the discharge port of the drum reaction chamber and the discharge unit.

[0011] Furthermore, the inner cylinder wall is connected to the feeding unit and the discharging unit respectively through dynamic sealing; the lower end of the outer cylinder wall is provided with an air inlet perpendicular to the cylinder wall, and the upper end of the outer cylinder wall is provided with an air outlet perpendicular to the cylinder wall, and the hot circulating gas at the air outlet is used for subsequent heat exchange treatment; the diameter of the perforated plate is equal to the inner diameter of the inner cylinder wall, and the perforated plate is uniformly arranged with holes of 3-5mm in diameter, so that quicklime and impurities can pass through the holes, while quicklime is retained in the drum reaction chamber; a pre-reserved hole is reserved in the center of the perforated plate; the cross fixing frame includes an outer steel ring, an inner steel ring, and steel bars, and the outer steel ring and the inner steel ring are connected by steel bars distributed in a "+" shape perpendicular to each other.

[0012] Furthermore, the drum reaction unit also includes a fixed stirring shaft sleeve fitted on the central drive main shaft. The fixed stirring shaft sleeve is provided with stirring rods, and multiple stirring rods are arranged in a spiral pattern along the axis perpendicular to the fixed stirring shaft sleeve.

[0013] Furthermore, the diameter of the stirring rod is 1cm-5cm, and the spacing between the stirring rods is 5cm-30cm.

[0014] Furthermore, the fixed stirring shaft sleeve includes an upper fixed section, an intermediate stirring shaft sleeve, and a lower fixed section connected in sequence; the upper fixed section is provided with a bearing and a bracket at its upper end, passes through the cross-shaped fixing frame in the middle by a sliding bearing, and is connected to the intermediate stirring shaft sleeve at its lower end; the lower fixed section is provided with a bearing and a bracket at its lower end, passes through the sieve plate in the middle by a sliding bearing, and is connected to the intermediate stirring shaft sleeve at its upper end.

[0015] Furthermore, the feeding unit includes a feeding bin, a feeding rotary valve, and a feeding pipe connected in sequence; the discharging unit includes a discharging pipe, a discharging rotary valve, and a discharging port connected in sequence.

[0016] Furthermore, the air inlet unit is connected to the discharge unit, and the axial direction of the air inlet unit is arranged parallel to the cylinder axis of the drum reaction unit; the air outlet unit is connected to the feed unit, and the axial direction of the air outlet unit is arranged horizontally.

[0017] Furthermore, the angle between the drum reaction chamber and the horizontal direction is 5°-10°.

[0018] A method of using a drum-type quicklime dewatering reactor, characterized in that sufficient quicklime is added to the feeding unit and the drum reaction unit is started at the selected rotation speed;

[0019] After the drum reaction unit is running stably, turn on the rotary opener of the feeding unit and add quicklime into the drum reaction chamber.

[0020] After quicklime fills the drum reaction chamber, humid gas is introduced through the air inlet unit. The rotation of the drum reaction chamber allows the quicklime and humid gas to be fully stirred and mixed to carry out the reaction.

[0021] The gas after reaction treatment is discharged from the gas outlet unit;

[0022] The rotary valve of the discharge unit is opened, and the reacted quicklime and impurities are separated from the quicklime under the action of rotation, stirring and friction, and discharged from the discharge unit for subsequent sorting and resource utilization.

[0023] The heat released by the reaction is collected by the thermal circulation gas and can be subsequently recycled.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) The drum-type quicklime reactor of the present invention can slowly rotate the drum to stir the material in the reaction chamber, peel off the hydrated lime and impurities adhering to the quicklime, and facilitate subsequent separation and recovery; at the same time, the rotation and stirring can disrupt the internal material layout, prevent caking and blockage, and achieve better gas flow. The reactor also further enhances the stirring effect by setting a fixed stirring shaft sleeve.

[0026] (2) The drum-type quicklime reactor of the present invention fully mixes the humid gas and quicklime by rotating and stirring the drum and adding a fixed stirring shaft sleeve, which greatly improves the dewatering efficiency, reaching up to 70.8%.

[0027] (3) The drum-type quicklime reactor of the present invention can achieve continuous feeding and continuous discharge through the rotary opener, so that the reactor is in a dynamic feeding and discharging process, which improves the processing efficiency and prevents the reactor from caking and clogging; at the same time, it can also avoid the secondary pollution caused by the escape of gas inside the reactor during feeding and discharging.

[0028] (4) Compared with existing quicklime fixed bed dewatering and lime drying towers, the drum-type quicklime reactor of the present invention has a more compact structure, occupies less space, and has higher working efficiency.

[0029] (5) The reaction heat of the present invention is recovered and utilized by the hot circulating gas between the drum walls, so as to realize the secondary utilization of resources. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of the drum-type quicklime dewatering reactor of the present invention;

[0031] Figure 2 This is a schematic diagram of a perforated sieve plate.

[0032] Figure 3 This is a schematic diagram of a cross-shaped fixing bracket;

[0033] The components include: 1. Feed hopper; 2. Feed rotary opener; 3. Feed pipe; 4. Air outlet unit; 5. Dynamic sealing device; 6. Central drive main shaft; 7. Outer cylinder wall; 8. Inner cylinder wall; 9. Welding; 10. Screen plate; 11. Discharge pipe; 12. Air inlet unit; 13. Discharge rotary opener; 14. Discharge port; 15. Main frame; 16. Upper fixed section; 17. Lower fixed section; 18. Intermediate stirring shaft sleeve; 19. Cross fixing frame. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] The drum-type quicklime dewatering reactor of this embodiment includes a feeding unit, a drum reaction unit, a discharge unit, an air inlet unit 12, and an air outlet unit 4. The drum reaction unit is horizontally inclined, with its feed inlet at the high end and its discharge outlet at the low end. The feed inlet is connected to the feeding unit, and the discharge outlet is connected to the discharge unit.

[0036] The air inlet unit 12 is connected to the discharge unit and its axis is set parallel to the axis of the cylinder; the air outlet unit 4 is connected to the feed unit and its axis is set horizontally.

[0037] The feeding unit includes a feeding hopper 1, a feeding rotary valve 2, and a feeding pipe 3. One end of the feeding pipe 3 is connected to the feed inlet of the drum reaction unit via a dynamic seal, and the other end of the feeding pipe 3 is connected to the feeding hopper 1 via the feeding rotary valve 2. When the drum reaction unit needs to be replenished with quicklime, the feeding rotary valve 2 is activated to feed the granular quicklime in the feeding hopper 1 into the feed inlet of the drum reaction unit through the feeding pipe 3, while preventing gas from leaking out of the feeding hopper 1.

[0038] The discharge unit includes a discharge rotary valve 13, a discharge port 14, and a discharge pipe 11. One end of the discharge pipe 11 is connected to the discharge port of the drum reaction unit via a dynamic seal, and the other end of the discharge pipe 11 is connected to the discharge port 14 via the discharge rotary valve 13 to achieve sealed discharge and prevent leakage of dust-laden gas. A collection device or a device for subsequent sorting can be connected below the discharge port 14.

[0039] The drum reaction unit includes a drum reaction chamber, a central drive main shaft 6, a fixed stirring shaft sleeve, and a main frame 15.

[0040] Regarding the drum reaction chamber, it includes the inner cylinder wall 8, the outer cylinder wall 7, the sieve plate 10, and the cross-shaped fixing frame 19;

[0041] The inner cylinder wall 8 rotates around the cylinder axis under the drive of the central drive shaft 6, so that the material is mixed evenly and the slaked lime is peeled off from the quicklime through the friction between the materials. It can also disturb the internal layout and clear blocked channels. The inner cylinder wall 8 and the feeding and discharging units at the upper and lower ends are airtight through the dynamic sealing device 5 (directly purchased).

[0042] The outer cylinder wall 7 is fixed to the main frame 15, and an air inlet is provided at the lower end of the outer cylinder wall 7 in a direction perpendicular to the cylinder wall. An air outlet is provided at the upper end of the outer cylinder wall 7 in a direction perpendicular to the cylinder wall. The hot circulating gas between the inner and outer cylinder walls enters the heat exchange system (an existing supporting system outside the present invention) after being blown by a fan through the air outlet. The heat exchange system uses circulating water in the heat exchange coil to recover the heat in the gas and provides a heat source for the pretreatment system (an existing system outside the present invention, used to heat the gas) through the circulating water.

[0043] A perforated screen plate 10 is installed at the connection surface between the discharge port and the discharge unit of the drum reaction chamber, such as... Figure 2 As shown, the residual impurities after the quicklime reaction and the product hydrated lime can pass through the sieve plate 10 into the discharge unit, while the unreacted quicklime is trapped in the drum reaction chamber.

[0044] A cross-shaped fixing bracket 19 is installed along the cross-sectional direction at the upper end of the drum reaction chamber near the inlet to position and fix the upper fixing section 16 of the intermediate stirring shaft sleeve 18. The cross-shaped fixing bracket 19 is as follows: Figure 3 As shown, the cross-shaped fixing bracket 19 includes an outer steel ring, an inner steel ring, and steel bars. The outer steel ring and the inner steel ring are connected by steel bars that are perpendicular to each other and distributed in a cross shape.

[0045] Specifically, the drum reaction chamber is placed on the main frame 15, with the feed inlet at the high end and the discharge outlet at the low end. The feed inlet is connected to the feeding unit, and the discharge outlet is connected to the discharge unit. The air inlet unit 12 is connected to the discharge unit, and its axis is set parallel to the axis of the drum body. The air outlet unit 4 is connected to the feed unit, and its axis is set horizontally. The feed rotary valve 2 is connected to the feed hopper 1 above and the feed pipe 3 below, achieving sealed and uniform feeding. The discharge rotary valve 13 is connected to the discharge pipe 11 above and the discharge outlet 14 below, achieving sealed discharge and preventing leakage of dust-laden gas.

[0046] The outer cylinder wall 7 is welded and fixed by the main frame 15, and an air inlet is set at the lower end of the outer cylinder wall in a direction perpendicular to the cylinder wall. An air outlet is set at the upper end of the outer cylinder wall in a direction perpendicular to the cylinder wall. The hot circulating gas between the inner and outer cylinder walls enters the heat exchange system after being blown by the fan. The heat exchange system uses circulating water in the heat exchange coil to recover the heat in the gas. The inner cylinder wall 8 rotates around the cylinder axis under the drive of the central drive shaft 6, and the rotation speed is 5rpm-10rpm. A screen plate 10 is installed on the connection surface between the discharge port of the drum reaction chamber and the discharge unit. A cross fixing bracket 19 is set at the upper end of the drum reaction chamber near the inlet along the cross section direction.

[0047] The fixed stirring shaft sleeve includes an upper fixed section 16, a lower fixed section 17, and an intermediate stirring shaft sleeve 18. The upper fixed section 16 has a bearing and support at its upper end, passes through a cross-shaped fixing frame 19 via a sliding bearing in the middle, and connects to the intermediate stirring shaft sleeve 18 at its lower end. The lower fixed section 17 has a bearing and support at its lower end, passes through a sieve plate 10 via a sliding bearing, and connects to the intermediate stirring shaft sleeve 18 at its upper end. A stirring rod is mounted on the intermediate stirring shaft sleeve 18; the stirring rod is arranged in a spiral pattern perpendicular to the shaft. When the drum reaction chamber rotates, the stirring rod on the fixed stirring shaft sleeve pushes the granular quicklime upwards, thereby achieving a loosening and stirring effect.

[0048] Furthermore, the feed hopper 1 can be a cuboid or cylindrical container with a volume of 2m³-6m³, which can store sufficient quicklime to achieve continuous feeding;

[0049] The diameters of the intake unit 12 and the exhaust unit 4 are 10cm-50cm;

[0050] The inner cylinder wall 8 has a diameter of 1m-5m, the distance between the inner and outer cylinder walls is 5cm-30cm, the wall thickness of the inner cylinder wall 8 and the outer cylinder wall 7 is 4mm-15mm, and it is made of carbon steel; the rotation speed is 5rpm-10rpm; the two ends of the drum reactor are connected to the inlet and outlet pipes by a dynamic seal.

[0051] Furthermore, the drum reaction chamber can be formed by welding one or more sections of cylinder, with the length of a single section being 1m-3m.

[0052] Furthermore, the angle between the drum reaction chamber and the horizontal direction is 5°-10°.

[0053] Furthermore, the diameter of the perforated plate 10 is equal to the inner diameter of the inner cylinder wall 8. Circular holes are evenly arranged on the perforated plate 10, with a hole diameter of 3mm-5mm, so that quicklime and impurities can pass through the holes, while the quicklime is trapped in the reaction chamber. A hole is reserved in the center of the perforated plate 10 for connecting and fixing the stirring shaft sleeve.

[0054] The outer steel ring of the cross-shaped fixing bracket 19 has the same diameter as the inner cylinder wall 8, and the inner steel ring has the same diameter as the reserved hole for connecting and fixing the stirring shaft sleeve.

[0055] Furthermore, the central drive spindle 6 has a diameter of 5cm-10cm, the fixed stirring shaft sleeve has a diameter of 5cm-20cm, the stirring rod on the fixed stirring shaft sleeve has a diameter of 1cm-5cm, and the spacing between the stirring rods is 5cm-30cm.

[0056] The above-mentioned drum-type quicklime dewatering reactor is used as follows:

[0057] Sufficient quicklime is added to the feed hopper, and the drum reaction unit is started at an appropriate speed. After the drum reaction unit is running stably, the feed rotary valve 2 is opened, and quicklime is added into the reaction chamber. After the material fills the drum reaction chamber, humid gas is introduced through the air inlet unit 12, and the treated gas is discharged from the air outlet unit 4. The discharge rotary valve 13 is opened, and the reacted quicklime and impurities are separated from the quicklime by the action of rotation, stirring and friction, and slide to the bottom of the reactor, where they are separated through the sieve plate 10 and discharged from the outlet for subsequent sorting and resource utilization. The heat released by the reaction is collected by the heat circulation gas, blown by a blower, and then enters the heat exchange system for recovery and utilization.

[0058] Example 1:

[0059] This embodiment provides a drum-type quicklime dewatering reactor for treating humid gas generated by low-temperature evaporation in an integrated aerobic stabilization system for ex-situ waste disposal, with a processing capacity of 500 m³ / h. The device includes a feeding unit, a drum reaction unit, a discharging unit, an inlet unit 12, and an outlet unit 4. Both the inlet unit 12 and the outlet unit 4 have a diameter of 20 cm. The feeding unit includes a feeding hopper 1, a feeding rotary valve 2, and a feeding pipe 3. The feeding hopper is a rectangular container, 2 m long, 1 m wide, and 2 m high, with a total volume of 4 m³. The discharging unit includes a discharging rotary valve 13, a discharge port 14, and a discharge pipe 11. The drum reaction unit includes a drum reaction chamber, a central drive shaft 6, a fixed stirring shaft sleeve, and a main frame 15. The diameter of the central drive shaft 6 is 5cm. The drum reaction chamber includes an inner cylinder wall 8, an outer cylinder wall 7, a sieve plate 10, and a cross-shaped fixing frame 19. The diameter of the inner cylinder wall 8 is 1m, the distance between the inner and outer cylinder walls is 10cm, and the wall thickness is 5mm. The fixed stirring shaft sleeve includes an upper fixing section 16, a lower fixing section 17, and a middle stirring shaft sleeve 18. The diameter of the fixed stirring shaft sleeve is 7cm, the diameter of the stirring rods on the shaft sleeve is 3cm, the spacing is 25cm, and the stirring rods are arranged in a spiral pattern perpendicular to the shaft.

[0060] The drum reaction chamber is placed on the main frame 15. The drum reaction chamber is welded from two sections of cylinder, each section being 1.5m long. The feed inlet is at the high end, and the discharge outlet is at the low end. The feed inlet connects to the feeding unit, and the discharge outlet connects to the discharge unit; the angle with the horizontal direction is 10°. The feed inlet is connected to the feeding unit via a dynamic sealing device 5, and the discharge outlet is connected to the discharge unit via the same dynamic sealing device 5. The air inlet unit 12 is connected to the discharge unit, and its axis is parallel to the cylinder axis. The air outlet unit 4 is connected to the feeding unit, and its axis is horizontal. The feed rotary valve 2 is connected to the feed hopper 1 above and the feed pipe 3 below, achieving sealed and uniform feeding. The discharge rotary valve 13 is connected to the discharge pipe 11 above and the discharge outlet 14 below, achieving sealed discharge and preventing leakage of dust-laden gas. The outer cylinder wall 7 is welded and fixed to the main frame 15, with an air inlet at the lower end perpendicular to the cylinder wall and an air outlet at the upper end perpendicular to the cylinder wall. The hot circulating gas between the inner and outer cylinder walls enters the heat exchange system after being purged by a fan through the air outlet. The heat exchange system uses circulating water in the heat exchange coil to recover heat from the gas. The inner cylinder wall 8 rotates around the cylinder axis under the drive of the central drive shaft 6 at a speed of 5 rpm. A perforated plate 10 is installed at the connection surface between the discharge port of the drum reaction chamber and the discharge unit. The diameter of the perforated plate 10 is equal to the inner diameter of the inner cylinder wall 8, and circular holes with a diameter of 3 μm are evenly arranged on the perforated plate 10. m; A cross-shaped fixing frame 19 is set at the upper end of the drum reaction chamber near the inlet along the cross section direction; a bearing and bracket are set at the upper end of the upper fixing section 16, and a sliding bearing passes through the cross-shaped fixing frame 19 in the middle, and the lower end is connected to the intermediate stirring shaft sleeve 18; a bearing and bracket are set at the lower end of the lower fixing section 17, and a sliding bearing passes through the sieve plate 10, and the upper end is connected to the intermediate stirring shaft sleeve 18; a stirring rod is set on the intermediate stirring shaft sleeve 18; the stirring rod is arranged in a spiral shape in a direction perpendicular to the shaft body. When the drum reaction chamber rotates, the stirring rod on the fixed stirring shaft sleeve will push the granular quicklime upward, thereby playing a role in loosening and stirring.

[0061] After being processed by this device, the relative humidity of the gas decreased from 75.5% at the inlet to 21.1% at the outlet, with a dehydration efficiency of up to 70.8%.

[0062] Example 2:

[0063] This embodiment provides a drum-type quicklime dewatering reactor for treating humid gas generated by low-temperature evaporation in an integrated aerobic stabilization system for ex-situ waste disposal. The processing capacity is 830 m³ / h. The device includes a feeding unit, a drum reaction unit, a discharging unit, an inlet unit 12, and an outlet unit 4. Both the inlet unit 12 and the outlet unit 4 have a diameter of 30 cm. The feeding unit includes a feeding hopper 1, a feeding rotary valve 2, and a feeding pipe 3. The feeding hopper is a rectangular container, 3 m long, 1 m wide, and 2 m high, with a total volume of 6 m³. The discharging unit includes a discharging rotary valve 13, a discharge port 14, and a discharge pipe 11. The drum reaction unit includes a drum reaction chamber, a central drive shaft 6, a fixed stirring shaft sleeve, and a main frame 15. The diameter of the central drive shaft 6 is 5 cm. The drum reaction chamber includes an inner cylinder wall 8, an outer cylinder wall 7, a sieve plate 10, and a cross-shaped fixing frame 19. The diameter of the inner cylinder wall 8 is 1.5 m, the distance between the inner and outer cylinder walls is 10 cm, and the wall thickness is 5 mm. The fixed stirring shaft sleeve includes an upper fixing section 16, a lower fixing section 17, and a middle stirring shaft sleeve 18. The diameter of the fixed stirring shaft sleeve is 7 cm, the diameter of the stirring rods on the shaft sleeve is 3 cm, the spacing is 25 cm, and the stirring rods are arranged in a spiral pattern perpendicular to the shaft.

[0064] The drum reaction chamber is placed on the main frame 15. The drum reaction chamber can be welded from two sections of cylinder, each section being 1.5m long. The feed inlet is at the high end, and the discharge outlet is at the low end. The feed inlet is connected to the feeding unit, and the discharge outlet is connected to the discharge unit; the angle with the horizontal direction is 10°. The feed inlet is connected to the feeding unit through a dynamic sealing device 5, and the discharge outlet is connected to the discharge unit through a dynamic sealing device 5. The air inlet unit 12 is connected to the discharge unit, and its axis is set parallel to the cylinder axis. The air outlet unit 4 is connected to the feeding unit, and its axis is set horizontally. The feed rotary opener 2 is connected to the feed hopper 1 above and the feed pipe 3 below, achieving sealed and uniform feeding. The discharge rotary opener 13 is connected to the discharge pipe 11 above and the discharge outlet 14 below, achieving sealed discharge and preventing leakage of dust-containing gas. The outer cylinder wall 7 is welded and fixed by the main frame 15. An air inlet is provided at the lower end of the outer cylinder wall 7 along a direction perpendicular to the cylinder wall, and an air outlet is provided at the upper end of the outer cylinder wall 7 along a direction perpendicular to the cylinder wall. The hot circulating gas between the inner and outer cylinder walls enters the heat exchange system after being blown by a fan through the air outlet. The heat exchange system uses circulating water in the heat exchange coil to recover the heat in the gas. The inner cylinder wall 8 rotates around the cylinder axis under the drive of the central drive shaft 6 at a rotation speed of 5 rpm. A perforated plate 10 is installed on the connection surface between the discharge port of the drum reaction chamber and the discharge unit. The diameter of the perforated plate 10 is equal to the inner diameter of the inner cylinder wall 8, and circular holes with a diameter of 3 μm are evenly arranged on the perforated plate 10. m; A cross-shaped fixing frame 19 is set at the upper end of the drum reaction chamber near the inlet along the cross section direction; a bearing and bracket are set at the upper end of the upper fixing section 16, and a sliding bearing passes through the cross-shaped fixing frame 19 in the middle, and the lower end is connected to the intermediate stirring shaft sleeve 18; a bearing and bracket are set at the lower end of the lower fixing section 17, and a sliding bearing passes through the sieve plate 10, and the upper end is connected to the intermediate stirring shaft sleeve 18; a stirring rod is set on the intermediate stirring shaft sleeve 18; the stirring rod is arranged in a spiral shape in a direction perpendicular to the shaft body. When the drum reaction chamber rotates, the stirring rod on the fixed stirring shaft sleeve will push the granular quicklime upward, thereby playing a role in loosening and stirring.

[0065] After being processed by this device, the relative humidity of the gas decreased from 78% at the inlet to 25.2% at the outlet, with a dehydration efficiency of 67.7%.

[0066] The foregoing description does not constitute a limitation on the scope of protection of this invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of the claims of this invention.

Claims

1. A rotary kiln lime slaking reactor characterized by, The reactor includes a drum reaction unit, a feeding unit, a discharging unit, an air inlet unit, and an air outlet unit. The drum reaction unit is inclined, with its high end connected to the feeding unit and the air outlet unit, and its low end connected to the discharging unit and the air inlet unit. The drum reaction unit includes a main frame, a drum reaction chamber, and a central drive shaft. The drum reaction chamber is set on the main frame, and the central drive shaft is set along the axial direction inside the drum reaction chamber. Driven by the central drive shaft, the drum reaction chamber rotates, thereby fully stirring the quicklime and the moist gas to react. The drum reaction chamber includes an inner cylinder wall, an outer cylinder wall, a perforated plate, and a cross-shaped fixing frame. The inner cylinder wall rotates around the cylinder axis under the drive of the central drive shaft. The outer cylinder wall is fixed on the main frame, and the hot circulating gas between the inner and outer cylinder walls can be recovered and reused. A perforated plate is provided on the connection surface between the discharge port of the drum reaction chamber and the discharge unit. The diameter of the perforated plate is equal to the inner diameter of the inner cylinder wall, and holes are evenly arranged on the perforated plate with a diameter of 3-5 mm, so that quicklime and impurities can pass through the holes, while the quicklime is trapped in the drum reaction chamber. The feeding unit includes a feeding rotary opener and the discharging unit includes a discharging rotary opener; the inner cylinder wall is connected to the feeding unit and the discharging unit respectively by a dynamic seal. The drum reaction unit also includes a fixed stirring shaft sleeve fitted on the central drive main shaft. The fixed stirring shaft sleeve is provided with stirring rods, and multiple stirring rods are arranged in a spiral pattern along the axis perpendicular to the fixed stirring shaft sleeve.

2. The drum-type quicklime dewatering reactor as described in claim 1, characterized in that, An air inlet is provided at the lower end of the outer cylinder wall in a direction perpendicular to the cylinder wall, and an air outlet is provided at the upper end of the outer cylinder wall in a direction perpendicular to the cylinder wall. The hot circulating gas at the air outlet is used for subsequent heat exchange treatment. The perforated plate has a pre-drilled hole in the center; The cross-shaped fixing frame includes an outer steel ring, an inner steel ring, and steel bars. The outer steel ring and the inner steel ring are connected by steel bars that are perpendicular to each other and distributed in a "+" shape.

3. A rotary lime kiln reactor as claimed in claim 1, wherein, The diameter of the stirring rod is 1cm-5cm, and the spacing between the stirring rods is 5cm-30cm.

4. The drum-type quicklime dewatering reactor as described in claim 1, characterized in that, The fixed stirring shaft sleeve includes an upper fixed section, an intermediate stirring shaft sleeve, and a lower fixed section connected in sequence; the upper fixed section is provided with a bearing and a bracket at its upper end, passes through the cross fixing frame in the middle by a sliding bearing, and is connected to the intermediate stirring shaft sleeve at its lower end; the lower fixed section is provided with a bearing and a bracket at its lower end, passes through the sieve plate in the middle by a sliding bearing, and is connected to the intermediate stirring shaft sleeve at its upper end.

5. A drum-type quicklime dewatering reactor as described in claim 1 or 2, characterized in that, The feeding unit includes a feeding bin, a feeding rotary opener and a feeding pipe connected in sequence; the discharging unit includes a discharging pipe, a discharging rotary opener and a discharging port connected in sequence.

6. A drum-type quicklime dewatering reactor as described in claim 1 or 2, characterized in that, The air inlet unit is connected to the discharge unit, and the axial direction of the air inlet unit is arranged parallel to the cylinder axis of the drum reaction unit; the air outlet unit is connected to the feed unit, and the axial direction of the air outlet unit is arranged horizontally.

7. A drum-type quicklime dewatering reactor as described in claim 1 or 2, characterized in that, The angle between the drum reaction chamber and the horizontal direction is 5°-10°.

8. The method of using the drum-type quicklime dewatering reactor according to any one of claims 1-7, characterized in that, Add sufficient quicklime to the feeding unit and start the drum reaction unit by selecting the appropriate speed. After the drum reaction unit is running stably, turn on the rotary opener of the feeding unit and add quicklime into the drum reaction chamber. After quicklime fills the drum reaction chamber, humid gas is introduced through the air inlet unit. The rotation of the drum reaction chamber allows the quicklime and humid gas to be fully stirred and mixed to carry out the reaction. The gas after reaction treatment is discharged from the gas outlet unit; The rotary valve of the discharge unit is opened, and the reacted quicklime and impurities are separated from the quicklime under the action of rotation, stirring and friction, and discharged from the discharge unit for subsequent sorting and resource utilization. The heat released by the reaction is collected by the thermal circulation gas and can be subsequently recycled.

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