Powder digestion machine

Abstract

The application provides a powder digestion machine, and relates to the technical field of environmental protection and energy saving.The powder digestion machine comprises a shell, a shell rotating driving device, stirring blades and a stirring blade driving device.The shell is used for containing materials and providing a crushing space.The stirring blades can be arranged in the shell, and the stirring blade driving device is configured to drive the stirring blades to rotate.The shell rotating driving device can drive the shell to rotate.The shell and the stirring blades are arranged to rotate, so that the collision probability of the materials is increased, and the best mixing and shearing effect is obtained.

Description

Technical Field

[0001] This invention relates to the field of environmental protection and energy-saving technology, and in particular to a powder digester. Background Technology

[0002] In the field of air pollution control, industrial kiln flue gas treatment primarily focuses on reducing emissions of sulfur dioxide and nitrogen oxides, along with reductions in acidic gases such as hydrogen fluoride and hydrogen chloride. It also aims to decrease the concentration of particulate matter (mainly dust) in the emissions. Currently, wet flue gas desulfurization (FGD) is widely used in most parts of my country, with the FGD lime-gypsum process being a prime example, accounting for over 90% of wet FGD applications. Wet FGD boasts the significant advantage of high desulfurization efficiency. Even if the original flue gas sulfur content reaches 20,000 mg / m³, it can still achieve significant reductions. 3 It can also treat flue gas to ultra-low emission requirements far below national standards. Therefore, FGD desulfurization is a commonly used flue gas treatment process.

[0003] Wet desulfurization also has obvious drawbacks. First, the acidic media in the flue gas, once dissolved in water, are extremely corrosive to the desulfurization equipment. Corrosion and corrosion prevention are always unavoidable issues in wet desulfurization, and maintenance is frequently required.

[0004] Secondly, wet desulfurization products contain nitrogen oxides and a small amount of sulfur dioxide, which meet emission standards. The simultaneous emission of both into the atmosphere is a major contributing factor to smog and can exacerbate local smog conditions.

[0005] Thirdly, energy conservation is an eternal topic, and all industries need to pay attention to saving energy. The temperature of flue gas emitted from furnaces and kilns is generally around 200℃ to 300℃. Flue gas at this temperature contains a large amount of enthalpy, and as long as it does not contain sulfur or dust, this heat energy can be well utilized, especially as a drying medium. However, flue gas after wet desulfurization generally has high humidity, close to saturation humidity, and its temperature is below 70℃, making it unusable and only suitable for emission. Therefore, dry desulfurization of flue gas has a broad market potential.

[0006] Fourth, currently, the desulfurizing agent used in dry flue gas desulfurization is generally sodium bicarbonate powder of about 300 mesh. Approximately 2.5 kg of baking soda removes 1 kg of sulfur dioxide, which is equivalent to a sulfur content of 300 mg / m³. 3 For flue gas, the desulfurization cost is about 24 yuan per 10,000 cubic meters, while for the same flue gas, the cost of consuming quicklime desulfurizing agent when using FGD wet desulfurization is only 2.5 yuan, a difference of nearly 10 times.

[0007] If sodium bicarbonate is not used as a desulfurizing agent in high-temperature dry flue gas desulfurization, and instead nano or sub-nano grade calcium hydroxide powder is used, the cost will be reduced significantly. For the aforementioned 10,000 cubic meters of flue gas, the desulfurization cost would be approximately 5 yuan.

[0008] my country has abundant and inexpensive limestone reserves. Limestone is calcined to produce calcium oxide, commonly known as quicklime. Quicklime is then hydrated to produce calcium hydroxide, commonly known as slaked lime or hydrated lime. The hydration of calcium oxide to produce calcium hydroxide involves two processes: wet hydration and dry hydration. In the wet hydration process, the water-cement ratio is very high, approximately 5:1, resulting in calcium hydroxide with a high water content. After dehydration and drying, it becomes powder. The calcium hydroxide powder obtained by this method has a relatively small specific surface area, generally ≤9m². 2 Calcium hydroxide of this particle size ( / g) exhibits excellent desulfurization properties in water and is a widely used desulfurizing agent in wet desulfurization processes. However, it has little activity in its powder state and does not possess dry desulfurization capabilities.

[0009] In the dry digestion process, the water-cement ratio is low, approximately 0.5:1, resulting in powdered calcium hydroxide. By carefully controlling the digestion temperature, time, and mixing speed, sub-nanometer-sized calcium hydroxide powder with a specific surface area of ​​up to 50 m² can be obtained. 2 / g, this sub-nanometer-sized calcium hydroxide powder has high activity and strong adsorption capacity. Even in high-temperature environments above 300℃, it can still adsorb and remove sulfur dioxide. At the same time, it also has the ability to adsorb nitrogen oxides and remove a certain amount of nitrogen oxides.

[0010] The dry slaking process for lime is currently still in the laboratory stage due to the difficulty in achieving the various process parameters, and there are few large-scale engineering applications.

[0011] The digestion of quicklime is a typical non-catalytic solid-liquid-solid three-phase reaction, consisting of three stages. In the first stage, CaO comes into contact with water to form Ca(OH)₂, which coats the CaO. In the second stage, water molecules enter the inner layer through the gaps in the Ca(OH)₂ coating, further reacting to form an inner layer of Ca(OH)₂. In the third stage, because the molar volume of Ca(OH)₂ is greater than that of CaO, the Ca(OH)₂ coating on the CaO surface expands, ruptures, and eventually falls off, exposing the inner CaO to a new surface layer for further digestion. These three stages are repeated continuously until the CaO digestion reaction is complete.

[0012] The digestion reaction of quicklime can proceed completely in wet digestion (where there is excess water). However, in dry digestion, very few excess water molecules penetrate the gaps between the Ca(OH)2 molecules covering the CaO surface during the second stage, preventing the reaction from continuing. In this case, external force is needed to peel off the covering Ca(OH)2, achieved through mixing and stirring. This mixing must also involve shearing. Because the digestion reaction of quicklime is a strongly exothermic reaction, the formation rate of Ca(OH)2 on the CaO surface is very fast. This necessitates a rapid peeling speed, and correspondingly, a rapid shearing, mixing, and stirring speed.

[0013] Even with high mixing speeds, achieving uniform mixing of powders remains a significant challenge. The most common mixing machinery is the paddle mixer, which has stirring blades of different shapes mounted on two parallel shafts. As the main body rotates, the powder moves laterally and tumbles up and down. Essentially, it primarily relies on motion mixing, with convection and diffusion mixing as secondary processes. It exerts relatively little shearing force on the powder and is not suitable for the dry slaking process of quicklime.

[0014] A rolling mixer coats one material onto the surface of another material particles while simultaneously scraping and agitating it with blades. Its stripping speed is very slow, making it unsuitable for stripping rapidly generated Ca(OH)2 particles and thus unsuitable for the dry digestion process of quicklime.

[0015] Other types of mixers, such as V-shaped cone, square cone, and double cone mixers, rely on the weight of the powder for mixing. They do not have a forced mixing effect and belong to diffusion mixing, not shear mixing. Therefore, they are not suitable for the dry digestion process of quicklime.

[0016] The QH-type mixer is a forced mixing machine consisting of two cylinders with a mixing chamber between them. The turbine blades and the mixing chassis within the chamber form a unique spatial angle, forcing the powder near the outer wall of the inner cylinder to move rapidly outwards, and the powder near the inner wall of the outer cylinder to move rapidly inwards. The powder is subjected to forced collision and shearing motion within the chamber, achieving rapid shearing and mixing. Because the turbine blades are close to the chassis and only move in a circular motion around the center, they also exert a compressive effect on the powder at the bottom. When used for dry slaking of quicklime, it is not possible to obtain very fine Ca(OH)2 powder. Practice shows that the specific surface area obtained by the QH-type mixer for dry slaking of quicklime is less than 20 m². 2 / g.

[0017] Pulse vortex pneumatic mixers are a type of forced mixing equipment with good shearing effect, but they are generally only suitable for mixing powders with a mesh size of 300 to 1 mm. Crucially, this process cannot parameterize the digestion process. To obtain sub-nanometer Ca(OH)₂ powder, equivalent to ultrafine powder with a mesh size of over 1000, in addition to shearing and mixing, it is necessary to control various parameters of the limestone digestion process, such as the water-cement ratio, temperature, pressure, and the amount of dispersant added. Therefore, this process equipment is also unsuitable for the dry digestion of quicklime.

[0018] Therefore, a new solution is urgently needed to at least partially solve the above problems. Summary of the Invention

[0019] The purpose of this invention is to provide a powder digester to solve the problems existing in the prior art and improve the shearing effect.

[0020] To achieve the above objectives, the present invention provides the following solution:

[0021] The present invention provides a powder digester, including a shell, a shell rotation drive device, a stirring blade, and a stirring blade drive device. The shell is used to contain materials and provide a crushing space. The stirring blade can be disposed inside the shell. The stirring blade drive device is configured to drive the stirring blade to rotate. The shell rotation drive device can drive the shell to rotate.

[0022] Preferably, the housing includes an inner cylinder, an outer cylinder, and a chassis; the inner cylinder and the outer cylinder are coaxially fixed on the chassis and form an annular grinding chamber between the inner cylinder and the outer cylinder, and the stirring blade is located in the grinding chamber.

[0023] Preferably, the stirring blade includes a stirring shaft and longitudinal blades. The stirring shaft and the stirring blade driving device are connected in a driving relationship. The longitudinal blades are fixedly disposed on one side of the stirring shaft and are arranged parallel to the length direction of the stirring shaft. The longitudinal blades have two vertical shear surfaces arranged along their own length direction. The distance between one of the vertical shear surfaces and the stirring shaft gradually decreases from the front end to the rear end, and the distance between the other vertical shear surface and the stirring shaft gradually increases from the front end to the rear end.

[0024] Preferably, multiple stirring blades are provided, and the multiple stirring blades are arranged sequentially in the annular grinding chamber.

[0025] Preferably, the device further includes a frame, a cover, and a cover lifting device. The stirring blade driving device includes multiple stirring motors, all of which are integrated on the top of the cover. The stirring blade is disposed at the bottom of the cover. The motor shaft of the stirring motor is connected to the stirring shaft. The cover is vertically mounted on the frame, and the housing is rotatably mounted on the frame. The cover is located directly above the housing. The cover lifting device can drive the cover down to cover the housing and drive the cover up to move away from the housing.

[0026] Preferably, a dynamic sealing structure is constructed between the housing and the cover, the dynamic sealing structure including a double-groove packing seal ring disposed on the top surface of the housing and a double pressure ring disposed on the bottom surface of the cover.

[0027] Preferably, the cover is provided with multiple spray nozzles, a feed inlet, a suction inlet, a dust collection inlet, an observation hole, a temperature measuring thermocouple, and a pressure sensor.

[0028] Preferably, the stirring blade further includes transversely arranged radial blades, each radial blade having a transverse shear surface arranged along its own length direction, the transverse shear surface having an angle with the stirring shaft, and the longitudinal blade having a triangular cross-section.

[0029] Preferably, the frame includes a base and a frame body. The base is fixedly disposed at the bottom of the frame body, and a plurality of level posts are also fixedly disposed on the base. The level posts are used to support the cover body. When the cover body is placed on the housing, the cover body falls exactly on the level posts.

[0030] Preferably, the housing is rotatably connected to the base via a slewing bearing, and is also equipped with a thin oil lubrication system to lubricate the moving components in the slewing bearing.

[0031] The present invention achieves the following technical effects compared to the prior art:

[0032] 1. This invention increases the probability of collision between materials by setting up a shell and stirring blades that rotate in a dual manner, thereby achieving the best mixing and shearing effect.

[0033] 2. The present invention improves the shearing effect by setting an annular crushing chamber, so that the inner and outer walls of the crushing chamber work together with the two vertical shearing surfaces on each longitudinal blade.

[0034] 3. The evenly distributed stirring blades of this invention maximize the chance of uniform digestion of quicklime and eliminate dead zones. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a powder digester provided in an embodiment of the present invention;

[0037] Figure 2 for Figure 1 Sectional view along line AA;

[0038] Figure 3 for Figure 1 Top view;

[0039] Figure 4 for Figure 1 Top view of the central power cover;

[0040] Figure 5 for Figure 4 Sectional view along line AA;

[0041] Figure 6 for Figure 1 Top view of the base;

[0042] Figure 7 for Figure 6 Sectional view along line AA;

[0043] Figure 8 for Figure 1 A front view of the stirring blades;

[0044] Figure 9 for Figure 8 Sectional view along line AA;

[0045] Figure 10 for Figure 8 A three-dimensional view of the stirring blades;

[0046] Figure 11 for Figure 1 Top view of the middle shell;

[0047] Figure 12 for Figure 11 Sectional view along line AA;

[0048] In the picture:

[0049] 1-Base; 2-Slewing bearing; 3-Housing; 4-Column; 5-Power cover; 6-Crossbeam; 7-Agitator blade; 8-Elevation column; 9-Hydraulic cylinder; 10-Revolutionary reducer; 11-Thin oil pump; 12-Dynamic seal structure;

[0050] 101-Base plate; 102-Rack; 103-Support platform; 104-Oil baffle ring; 105-Thin oil tank;

[0051] 31-Chassis; 32-Outer cylinder; 33-Inner cylinder; 34-Power plate; 35-Outer wall; 36-Double groove packing seal ring;

[0052] 51-Cover body; 52-Stirring motor; 53-Spray nozzle; 54-Double pressure ring; 55-Feed inlet; 56-Suction port; 57-Dust collection port; 58-Observation hole; 59-Temperature thermocouple; 510-Pressure sensor;

[0053] 71-Stirring shaft; 72-Longitudinal blade; 73-Wheel blade. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] This invention provides a powder digester, which can be called a sub-nanometer calcium hydroxide powder digester when digesting sub-nanometer-sized calcium hydroxide powder. Figures 1-12 As shown, it includes a housing 3, a housing rotation drive device, a stirring blade 7, and a stirring blade drive device. The housing 3 is used to contain materials and provide a crushing space. The stirring blade 7 can be disposed inside the housing 3. The stirring blade drive device is configured to drive the stirring blade 7 to rotate. The housing rotation drive device can drive the housing 3 to rotate.

[0057] Compared to existing solutions that only use the stirring blade 7 to stir and shear materials, this embodiment of the invention increases the probability of collision between materials by setting both the housing 3 and the stirring blade 7 to achieve the best mixing and shearing effect.

[0058] The above embodiments of the present invention do not limit the specific structure of the housing 3, the housing rotation drive device, the stirring blade 7, and the stirring blade drive device, that is, any one of them can be used with a device that can achieve its function in the prior art. However, in order to further improve the shearing effect, in some embodiments, the stirring blade 7 includes a stirring shaft 71 and a longitudinal blade 72. The stirring shaft 71 and the stirring blade drive device are connected in a driving connection. The longitudinal blade 72 is fixedly disposed on one side of the stirring shaft 71 and is arranged parallel to the length direction of the stirring shaft 71. The longitudinal blade 72 has two vertical shearing surfaces arranged along its own length direction. The distance between one vertical shearing surface and the stirring shaft 71 gradually decreases from the front end to the rear end, and the distance between the other vertical shearing surface and the stirring shaft 71 gradually increases from the front end to the rear end.

[0059] In this embodiment, the vertical shearing surface cooperates with the inner wall of the shell 3 to realize the process of shearing the material. Specifically, the front end and the rear end of the vertical shearing surface are defined according to its rotation direction, that is, the front end contacts the material first. Thus, during crushing, the material enters the shearing gap between the vertical shearing surface and the shell 3 through the front end of the vertical shearing surface. Then, as the vertical shearing surface rotates, the vertical shearing surface and the inner wall of the shell 3 work together to shear the material between them.

[0060] In some embodiments, the stirring blade 7 further includes transversely arranged radial blades 73, which have transverse shear surfaces arranged along their own length direction, and the transverse shear surfaces are at an angle to the stirring shaft 71. The longitudinal blades 72 have a triangular cross-section.

[0061] In this embodiment, the transverse shearing surface is used to cooperate with the inner wall of the housing 3 to shear materials moving from top to bottom or from bottom to top.

[0062] In the specific design, the radial blades 73 and longitudinal blades 72 are formed by bending metal plates, such as... Figure 10 As shown, the longitudinal blade 72 has an approximately triangular cross-section, with two inclined surfaces serving as vertical shear surfaces. The radial blade 73 is formed by bending two metal plates to create a channel-shaped plate, with the two channel-shaped plates facing each other. Of course, in some embodiments, the longitudinal blade 72 can also adopt a channel-shaped plate structure, and the radial blade 73 can also adopt a bent plate structure with a triangular cross-section.

[0063] To further improve the shearing effect, in some embodiments, the housing 3 includes an inner cylinder 33, an outer cylinder 32 and a base 31; the inner cylinder 33 and the outer cylinder 32 are coaxially fixed on the base 31 and form an annular crushing chamber between the inner cylinder 33 and the outer cylinder 32, and the stirring blade 7 is located in the crushing chamber.

[0064] In this embodiment of the invention, the rotation of the stirring blade 7 relative to the housing 3 forms a revolution, and the stirring blade 7 rotates on its own axis under the drive of its own driving device. This revolution and rotation motion results in a very good mixing and shearing effect on the lime powder.

[0065] In addition, by setting an annular crushing chamber, the present invention enables the inner and outer walls 35 of the crushing chamber (i.e., the outer wall 35 of the inner cylinder 33 and the inner wall of the outer cylinder 32) to work together with the two vertical shearing surfaces on each longitudinal blade 72 to improve the shearing effect.

[0066] In some embodiments, the outer cylinder 32 of the shell 3 is covered by an outer wall 35 to form a sandwich space. The sandwich space is filled with water to form a water-cooled jacket, which is used to cool and absorb the large amount of heat released during the digestion of quicklime. Cooling water can circulate in the sandwich space.

[0067] In some embodiments, multiple stirring blades 7 are provided, and the multiple stirring blades 7 are arranged sequentially in the annular grinding chamber.

[0068] In this embodiment, the evenly distributed stirring blades 7 maximize the chance of the quicklime being digested evenly, eliminating any dead zones.

[0069] In some embodiments, the present invention further includes a frame, a cover 51, and a cover lifting device. The stirring blade driving device includes multiple stirring motors 52, all of which are integrated on the top of the cover 51. The stirring blades 7 are disposed at the bottom of the cover 51. The motor shafts of the stirring motors 52 and the stirring shafts 71 are connected for transmission. The cover 51 is vertically mounted on the frame, and the housing 3 is rotatably mounted on the frame. The cover 51 is located directly above the housing 3. The cover lifting device can drive the cover 51 to descend onto the housing 3 and drive the cover 51 to rise away from the housing 3. In a preferred embodiment, the cover lifting device is a hydraulic cylinder, with its cylinder body disposed at the bottom of the frame and the piston connected to the cover.

[0070] In some embodiments, a dynamic sealing structure 12 is constructed between the housing 3 and the cover 51. The dynamic sealing structure 12 includes a double-groove packing seal ring 36 disposed on the top surface of the housing 3 and a double pressure ring 54 disposed on the bottom surface of the cover 51.

[0071] Specifically, when the housing 3 is the housing 3 with an inner cylinder 33 and an outer cylinder 32 in the above embodiment, the double groove packing seal ring 36 is disposed on the top of the outer cylinder 32, wherein the double pressure ring 54 is pressed into the two grooves of the double groove packing seal ring 36 to form a double seal in order to obtain a better sealing effect, and the two are in sliding contact.

[0072] In some embodiments, the cover 51 is provided with a plurality of spray nozzles 53, a feed inlet 55, a suction port 56, a dust collection port 57, an observation hole 58, a temperature measuring thermocouple 59, and a pressure sensor 510.

[0073] Specifically, the spray nozzle 53 is located inside the cover 51 and connected to the spray system. During the crushing process, the mixed aqueous solution containing the dispersant is sprayed onto the quicklime material through the spray nozzle 53 in a measured amount.

[0074] During feeding, 150-mesh quicklime is weighed in a weighing hopper before being fed into the housing 33 through the positive pressure pneumatic conveying system via the feed inlet 55. The conveying air brought in enters the bag filter through the dust collection port 57 and is collected.

[0075] After digestion is complete, the dust collection port 57 is closed, and the rotation of the shell 3 and the stirring blade 7 is notified. The negative pressure suction system draws out the quicklime powder from the shell 3 through the suction port 56 and finally packages it.

[0076] The real-time digestion status can be obtained by detecting the temperature and pressure values ​​inside the shell 3 using the temperature measuring thermocouple 59 and the pressure sensor 510.

[0077] In some embodiments, the frame includes a base 1 and a frame body. The base 1 is fixedly disposed at the bottom of the frame body. A plurality of leveling columns 8 are also fixedly disposed on the base 1. The leveling columns 8 are used to support the cover 51. When the cover 51 is placed on the housing 3, the cover 51 falls exactly on the leveling columns 8.

[0078] In this embodiment, the equal height column 8 is set to prevent the double pressure ring 54 in the dynamic sealing structure 12 from being located exactly inside the double groove packing seal ring 36 without being pressed too tightly, which would prevent the two from sliding relative to each other. It can also prevent the cover 51 from crushing the shell 3.

[0079] In some embodiments, the housing 3 is rotatably connected to the base 1 via the slewing bearing 2, and is also equipped with a thin oil lubrication system to lubricate the moving components in the slewing bearing 2.

[0080] The revolution reducer 10 is mounted on the base 1 and is connected to the moving ring of the slewing bearing 2 through a transmission connection, such as through gears, belts or couplings. The revolution reducer 10 then drives the moving ring to rotate the housing 3.

[0081] The base 1 is also provided with a thin oil tank 105, which contains lubricating oil. The lubricating oil is pumped into the slewing bearing 2 through pipelines and a thin oil pump 11 to lubricate its moving components, such as balls.

[0082] The base 1 includes a base plate 101, a frame 102, a support platform 103, an oil baffle ring 104, and a thin oil tank 105. The support platform 103 is used to install the slewing bearing 2. The oil baffle ring 104 is located around the slewing bearing 2.

[0083] In some embodiments, the housing 3 is mounted on the slewing bearing 2 via a power plate 34.

[0084] The cover 51 and the structure integrated thereon constitute the structure. Figure 5 The power cover 5 in the middle.

[0085] The specific implementation is as follows: The housing 3 is mounted on the slewing bearing 2, which is fixed to the base 1. The housing rotation drive device drives the moving ring of the slewing bearing 2 to rotate, causing the housing 3 to rotate at a set speed. The column 4 (the frame described in the above embodiment) is mounted on the base 1 and is connected and stabilized by the crossbeam 6. The power cover 5 is slidably connected to the column 4 and moves up and down through the hydraulic cylinder 9. In the working state, the hydraulic cylinder 9 pulls down the power cover 5, pressing it onto the four equal-height columns 8, positioning and stabilizing the power cover 5. At this time, the double pressure ring 54 presses the double-groove packing sealing ring 36 to form a seal. The stirring blade 7 revolves with the rotation of the housing 3 and rotates on its own axis under the drive of its own drive device. This revolution and rotation motion provides excellent mixing and shearing effects for the lime powder.

[0086] 150-mesh quicklime is pre-weighed in a weighing hopper and then fed into the shell 3 through the feed inlet 55 via a positive pressure pneumatic conveying system. The conveying air is collected in a bag filter through the dust collection port 57. After all the quicklime powder has been fed into the shell 3, the stirring blade 7 rotates rapidly, and a mixed aqueous solution containing dispersant is sprayed onto the quicklime material through the spray nozzle 53. By adjusting the revolution speed of the shell 3, the rotation speed of the stirring blade 7, and the amount of water in the sprayed aqueous solution, the desired sub-nanometer particle size of calcium hydroxide powder can be obtained. Obviously, the faster the rotation speed and the faster the revolution speed of the shell, the faster the Ca(OH)2 particles coated on the CaO surface will peel off, resulting in finer calcium hydroxide powder. The dispersant is used to prevent the fine calcium hydroxide powder from clumping together.

[0087] Here, in addition to the optimal mixing and shearing effect achieved by the calcium oxide powder under the dual action of revolution and rotation, the six evenly distributed mixers maximize the probability of uniform digestion of quicklime, eliminating dead zones. After digestion, the dust collection port 57 is closed, the revolution and rotation speeds are reduced, and the hydrated lime powder is sucked out of the shell 3 through the suction port 56 using the negative pressure suction system, and finally packaged. The particle size of the digested calcium hydroxide fine powder is adjusted by controlling the water-cement ratio, revolution speed, rotation speed, dispersant dosage, mixing time, spraying time, and spraying frequency. The real-time digestion status can be obtained by monitoring temperature and pressure values.

[0088] The shell rotation drive, hydraulic system, quicklime powder weighing system, pneumatic positive pressure conveying system, pneumatic negative pressure suction conveying system, and dust collection system involved in this invention are all general mechanical equipment, and this invention does not impose any special limitations on them.

[0089] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A powder digester, comprising a shell, stirring blades, and a stirring blade driving device, wherein the shell is used to contain materials and provide a crushing space, the stirring blades are disposed within the shell, and the stirring blade driving device is configured to drive the stirring blades to rotate; characterized in that: It also includes a housing rotation drive device, which can drive the housing to rotate; the housing includes an inner cylinder, an outer cylinder, and a chassis; the inner cylinder and the outer cylinder are coaxially fixed on the chassis and form an annular pulverizing chamber between the inner cylinder and the outer cylinder, and the stirring blade is located in the pulverizing chamber; the stirring blade includes a stirring shaft and longitudinal blades, the stirring shaft and the stirring blade drive device are connected in transmission, the longitudinal blade is fixedly disposed on one side of the stirring shaft and is arranged parallel to the length direction of the stirring shaft, the longitudinal blade has two vertical shear surfaces arranged along its own length direction, one of which is between the stirring shaft and the longitudinal blade. The distance between the vertical shearing surface and the stirring shaft gradually decreases from the front end to the rear end, while the distance between the vertical shearing surface and the stirring shaft gradually increases from the front end to the rear end. The vertical shearing surface works together with the inner wall of the shell to shear the material. Multiple stirring blades are provided, and the multiple stirring blades are arranged sequentially in the annular crushing chamber along the circumference of the crushing chamber, so that each stirring blade can cooperate with the inner and outer walls of the annular crushing chamber to shear the material. The stirring blades also include transversely arranged radial blades, each radial blade having a transverse shearing surface arranged along its own length direction, the transverse shearing surface having an angle with the stirring shaft, and the cross-section of the longitudinal blades being triangular.

2. The powder digester according to claim 1, characterized in that: It also includes a frame, a cover, and a cover lifting device. The stirring blade driving device includes multiple stirring motors, all of which are integrated on the top of the cover. The stirring blade is located at the bottom of the cover. The motor shaft of the stirring motor is connected to the stirring shaft. The cover is vertically mounted on the frame. The housing is rotatably mounted on the frame. The cover is located directly above the housing. The cover lifting device can drive the cover down to cover the housing and drive the cover up to move away from the housing.

3. The powder digester according to claim 2, characterized in that: A dynamic sealing structure is constructed between the housing and the cover, the dynamic sealing structure including a double-groove packing seal ring disposed on the top surface of the housing and a double pressure ring disposed on the bottom surface of the cover.

4. The powder digester according to claim 2, characterized in that: The cover is equipped with multiple spray nozzles, a feed inlet, a suction inlet, a dust collection inlet, an observation hole, a temperature measuring thermocouple, and a pressure sensor.

5. The powder digester according to claim 2, characterized in that: The frame includes a base and a frame body. The base is fixedly installed at the bottom of the frame body. Multiple equal-height columns are also fixedly installed on the base. The equal-height columns are used to support the cover body. When the cover body is placed on the shell, the cover body falls exactly on the equal-height columns.

6. The powder digester according to claim 5, characterized in that: The housing is rotatably connected to the base via a slewing bearing, and is also equipped with a thin oil lubrication system to lubricate the moving components in the slewing bearing.

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