Calcium hydroxide preparation equipment and process

Abstract

The present invention provides a calcium hydroxide preparation device and process, which relates to the technical field of calcium hydroxide preparation. The calcium hydroxide preparation device includes: a digestion reaction chamber, a drying chamber, and a conveying pipeline, wherein the cavity wall of the digestion reaction chamber is provided with a first feed port for inputting calcium oxide and a second feed port for inputting superheated water vapor, and the bottom wall is provided with a first discharge port; the cavity wall of the drying chamber is provided with an inlet, and the bottom wall is provided with a second discharge port; the first port of the conveying pipeline serves as a gas inlet for inputting dry gas, and the second port serves as an outlet connected to the inlet, and the pipe wall is provided with an inlet connected to the first discharge port. The process adopts the above-mentioned preparation device. In the preparation device, superheated water vapor is used as a raw material to carry out a digestion reaction with calcium oxide, and the preparation efficiency is high and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of calcium hydroxide preparation, and in particular to calcium hydroxide preparation equipment and process. Background Art

[0002] Calcium hydroxide is widely used in production and daily life. Currently, calcium hydroxide is generally prepared by the digestion reaction of calcium oxide (quicklime) and water. Since the hydration of quicklime is a spontaneous and violent process, starch, sucrose and other hydroxyl-rich substances are generally added to the water as solutes during the industrial preparation process to slow the reaction rate of quicklime and water, thereby reducing the solidification of the reaction product on the production equipment. However, these solutes will begin to ferment after a certain period of time, which not only affects the subsequent preparation process, but also requires separation and purification of the product after preparation. This makes the preparation less convenient and more expensive. Summary of the Invention

[0003] The object of the present invention is to provide a calcium hydroxide preparation device and process to solve the technical problems of poor convenience and high cost in the prior art for preparing calcium hydroxide.

[0004] In order to solve the above problems, the present invention provides a calcium hydroxide preparation device, comprising:

[0005] A digestion reaction chamber, wherein the chamber wall of the digestion reaction chamber is provided with a first feed port for inputting calcium oxide and a second feed port for inputting superheated water steam, and the bottom wall is provided with a first discharge port;

[0006] A drying chamber, wherein the chamber wall of the drying chamber is provided with an inlet, and the bottom wall is provided with a second outlet; and

[0007] The delivery pipeline has a first port as a gas delivery port for inputting dry gas, a second port as an output port connected to the feed port, and an input port connected to the first discharge port is provided on the pipe wall.

[0008] Optionally, the drying chamber is provided with an air outlet, a filter component that only allows water vapor to pass through is separated between the feed inlet and the air outlet, and the feed inlet and the second outlet are located on the same side of the filter component;

[0009] The calcium hydroxide preparation equipment also includes a gas storage tank, the inlet of the gas storage tank is connected to the gas outlet and the connecting path is provided with an induced draft fan; the outlet of the gas storage tank is connected to the second material delivery port.

[0010] Optionally, the calcium hydroxide preparation equipment also includes a first heat exchanger, the first heat exchanger includes a first cold side channel and a first hot side channel, the channel inlet of the first cold side channel is connected to a water supply pipe, and the channel outlet is connected to the second feed port, the channel inlet of the first hot side channel is connected to the air outlet through a connecting pipe, and the channel outlet is connected to the inlet of the gas storage tank.

[0011] Optionally, a first heat exchange component is provided in the digestion reaction chamber, and a first heat exchange channel for the heat exchange medium to flow through is provided in the first heat exchange component; a second heat exchange component is provided in the drying chamber, and a second heat exchange channel connected to the channel outlet of the first heat exchange channel is provided in the second heat exchange component.

[0012] Optionally, the calcium hydroxide preparation equipment also includes a second heat exchanger, which includes a second hot side channel and a second cold side channel, the channel inlet of the second hot side channel is connected to the channel outlet of the first heat exchange channel, the channel inlet of the second cold side channel is connected to the air supply pipe, and the channel outlet is connected to the air delivery port.

[0013] Optionally, the pipe section of the delivery pipeline located between the gas delivery port and the input port includes a necked section, and the necked end of the necked section faces the input port.

[0014] Optionally, a flared nozzle is provided on the periphery of the feed port, and the output port is matched and connected to the flared end of the nozzle.

[0015] Optionally, the filter assembly is located at the top position in the drying chamber, the first side cavity wall in the drying chamber is provided with a first baffle, and the second side cavity wall opposite to the first side cavity wall is provided with a second baffle, the first baffle and the second baffle are arranged alternately in the up and down directions, and both extend toward each other and tilt downward.

[0016] The present invention also provides a calcium hydroxide preparation process, which uses the above-mentioned calcium hydroxide preparation equipment. The calcium hydroxide preparation process comprises:

[0017] Digestion reaction: Calcium oxide and superheated steam are fed into the digestion reaction chamber as reaction raw materials to mix and react to generate primary products;

[0018] Drying treatment: The dry gas in the conveying pipeline carries the primary product into the drying chamber, and the primary product is dried to separate the superheated water vapor from the calcium hydroxide. The dried calcium hydroxide is output through the second discharge port.

[0019] Optionally, in the digestion reaction, the molar ratio of calcium oxide to superheated steam is 1:1.05 to 1:1.15.

[0020] When used, the calcium hydroxide preparation device provided by the present invention can use superheated water vapor as a raw material to carry out a digestion reaction with calcium oxide. On the one hand, it can improve the contact sufficiency between calcium oxide and superheated water vapor, thereby improving the reaction degree of the digestion reaction, thereby reducing the content of calcium oxide in the primary product and correspondingly improving the content and purity of calcium hydroxide in the primary product. On the other hand, it can effectively control the reaction speed of the digestion reaction to obtain a calcium hydroxide product with a smaller particle size, thereby reducing the subsequent crushing operation load of the calcium hydroxide product and reducing the occurrence of the product easily adhering to and solidifying on the wall of the reaction chamber due to a more intense reaction, thereby reducing the effective storage volume of the reaction chamber and even causing blockage. In addition, it can also effectively improve the fluidity and specific surface area of ​​the calcium hydroxide in the primary product, thereby improving the sufficiency of the primary product in contact with the drying gas in the conveying pipeline and the drying chamber, thereby improving the drying gas to fully dry the calcium hydroxide in the primary product, and obtaining a high-purity calcium hydroxide product. At the same time, on the basis of achieving controlled reaction speed, it is unnecessary to add other components to the raw materials, correspondingly reducing the complex operation of subsequent separation and purification of the product mixture, thereby improving the convenience of calcium hydroxide preparation and reducing the preparation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A process flow chart of the calcium hydroxide preparation equipment provided by an embodiment of the present invention when it is in the first form;

[0023] Figure 2 A process flow chart of the second form of the calcium hydroxide preparation equipment provided by an embodiment of the present invention;

[0024] Figure 3 A process flow chart of the calcium hydroxide preparation equipment provided by an embodiment of the present invention when it is in the third form;

[0025] Figure 4 A process flow chart of the calcium hydroxide preparation equipment provided by an embodiment of the present invention in the fourth form;

[0026] Figure 5 The present invention provides a process flow chart of the calcium hydroxide preparation equipment in the fifth form.

[0027] Description of reference numerals:

[0028] 100 - digestion reaction chamber; 110 - first feed port; 120 - second feed port; 130 - first discharge port; 140 - first heat exchange component; 200 - drying chamber; 210 - feed port; 220 - air outlet; 230 - second discharge port; 240 - filter component; 250 - second heat exchange component; 260 - nozzle; 270 - first baffle; 280 - second baffle; 300 - delivery pipeline; 310 - air port; 320 - discharge port; 330 -input port; 340-narrowing section; 400-second heat exchanger; 410-second hot side channel; 420-second cold side channel; 500-first heat exchanger; 510-first cold side channel; 520-first hot side channel; 600-gas storage tank; 700-stirring assembly; 710-drive motor; 720-stirring paddle; 810-controller; 820-material collecting device; 830-induced draft fan; 910-air supply pipe; 920-water supply pipe; 930-connecting pipe. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] This embodiment provides a calcium hydroxide preparation device, such as Figure 1As shown, it includes: a digestion reaction chamber 100, a drying chamber 200 and a conveying pipeline 300, wherein the cavity wall of the digestion reaction chamber 100 is provided with a first feed port 110 for inputting calcium oxide and a second feed port 120 for inputting superheated water steam, and the bottom wall is provided with a first discharge port 130; the cavity wall of the drying chamber 200 is provided with an inlet 210, and the bottom wall is provided with a second discharge port 230; the first port of the conveying pipeline 300 is used as a gas inlet 310 for inputting drying gas, and the second port is used as an outlet 320 connected to the inlet 210, and the pipe wall is provided with an inlet 330 connected to the first outlet 130.

[0033] The calcium hydroxide production apparatus provided in this embodiment includes a digestion reaction chamber 100 having a reaction chamber enclosed therein for preparing a primary product, a drying chamber 200 having a drying chamber enclosed therein for drying and separating the primary product to obtain a pure calcium hydroxide product, and a conveying pipeline 300 for conveying the primary product to the drying chamber 200. When the apparatus is in use, the first discharge port 130 is first kept in a blocked state, and then calcium oxide particles of a size and purity meeting the requirements are fed into the reaction chamber through the first feed port 110. Simultaneously, superheated water vapor at a preset temperature is fed into the reaction chamber through the second feed port 120. The gaseous superheated water vapor can then fully contact the calcium oxide particles to undergo a digestion reaction with a high degree of reaction, thereby reducing the calcium oxide content in the primary product and correspondingly increasing the calcium hydroxide content in the primary product. Specifically, the primary product includes a mixture of calcium hydroxide and unreacted superheated water vapor. At the same time, using gaseous superheated water vapor as a raw material can effectively control the reaction rate between water molecules and calcium oxide, thereby reducing the particle size of the calcium hydroxide in the primary product and reducing the subsequent calcium hydroxide pulverization operation load.

[0034] After a certain period of time, when the superheated water vapor in the reaction chamber fully reacts with the calcium oxide, dry gas is supplied to the conveying pipeline 300 through the gas supply port 310 for conveying and drying the primary product; the first discharge port 130 is opened, and the primary product generated in the reaction chamber falls downward into the conveying pipeline through the first discharge port 130 and the input port 330, and the airflow formed by the dry gas carries the primary product to the gas supply port 310 and then enters the drying chamber through the inlet 210. The dry gas fully contacts the primary product to separate the superheated water vapor from the calcium hydroxide, thereby achieving drying and separation of the primary product. Subsequently, the dried calcium hydroxide product moves downward under the action of its own gravity and the airflow and is output through the second discharge port 230, thereby obtaining a dry and high-purity calcium hydroxide product.

[0035] The calcium hydroxide preparation apparatus provided in this embodiment can be used to digest calcium oxide using superheated steam as a raw material. This can improve the contact between calcium oxide and superheated steam, thereby increasing the degree of the digestion reaction and reducing the calcium oxide content in the primary product, thereby correspondingly increasing the calcium hydroxide content and purity in the primary product. Furthermore, the reaction rate of the digestion reaction can be effectively controlled to obtain a calcium hydroxide product with a smaller particle size, thereby reducing the subsequent crushing load of the calcium hydroxide product and reducing the tendency of the product to adhere to and solidify on the walls of the reaction chamber due to a more intense reaction, thereby reducing the effective volume of the reaction chamber and even causing blockage. Furthermore, the fluidity and specific surface area of ​​the calcium hydroxide in the primary product can be effectively improved, thereby increasing the contact between the primary product and the drying gas in the delivery pipeline 300 and the drying chamber, thereby improving the drying of the calcium hydroxide in the primary product by the drying gas, and obtaining a high-purity calcium hydroxide product. Furthermore, while achieving controlled reaction rate, there is no need to add other ingredients to the raw materials, thereby reducing the complex operations of subsequent separation and purification of the product mixture, thereby improving the convenience of calcium hydroxide preparation and reducing preparation costs.

[0036] Specifically, if Figure 1-Figure 5 As shown, there are multiple first feed ports 110, and the multiple first feed ports 110 are all located on the first side cavity wall of the digestion reaction chamber 100, and are arranged at intervals along the up-down direction; there are multiple second feed ports 120, and the multiple second feed ports 120 are all located on the second side cavity wall of the digestion reaction chamber 100 opposite to the first side cavity wall, and are arranged at intervals along the up-down direction. Multiple first feed ports 110 and multiple second feed ports 120 are dispersedly located on opposite sides of the reaction chamber. During feeding, multiple first feed ports 110 simultaneously input calcium oxide, and multiple second feed ports 120 simultaneously input superheated water vapor. On the one hand, the calcium oxide and superheated water vapor entering the reaction chamber can be evenly distributed throughout the entire reaction chamber, thereby improving the mixing uniformity of the two raw materials, correspondingly improving the contact adequacy between the two, and further improving the reaction adequacy between the two; on the other hand, the first feed ports 110 and the second feed ports 120 are positioned relative to each other, and the calcium oxide and superheated water vapor fed into the reaction chamber collide with each other, thereby further improving the mixing uniformity and release adequacy of the two raw materials, thereby further improving the reaction adequacy between the two and the purity of the calcium hydroxide in the generated primary product.

[0037] In this embodiment, a stirring assembly 700 can also be provided in the digestion reaction chamber 100. The stirring assembly 700 can stir the calcium oxide and superheated water vapor in the reaction chamber to further improve the mixing efficiency of the two raw materials and correspondingly further improve the reaction efficiency of the two.

[0038] Specifically, the stirring assembly 700 may include a driving motor 710 installed on the top of the digestion reaction chamber 100 and a stirring paddle 720 installed in the reaction chamber, and the top end of the stirring paddle 720 is connected to the driving end of the driving motor 710, and the driving motor 710 is used to drive the stirring paddle 720 to rotate to stir the raw materials.

[0039] Specifically, a cover that can be opened and closed can be provided at the first discharge port 130 and the second discharge port 230 to adjust the blocking state of the first discharge port 130 and the second discharge port 230; the drying gas can be hot air or other inert gas that does not react with calcium oxide, water and calcium hydroxide; a receiving device 820 can be provided below the second feed port 120, so that the dried calcium hydroxide product can directly fall into the receiving device 820 through the second discharge port 230.

[0040] In this embodiment, the calcium hydroxide preparation equipment may further include a controller 810. A temperature sensor and a pressure sensor are provided in the digestion reaction chamber 100. The temperature sensor, the pressure sensor, the drive motor 710, and the air supply flow valve are all connected to the controller 810. The controller 810 can adjust the opening of the air supply flow valve according to the temperature and pressure in the reaction chamber fed back by the temperature sensor and the pressure sensor, and accordingly adjust the flow rate of the superheated water vapor input into the reaction chamber, thereby further increasing the speed of the digestion reaction in the reaction chamber. Specifically, the temperature in the reaction chamber can be maintained at approximately 600°C.

[0041] In this embodiment, Figure 2As shown, an air outlet 220 can also be provided in the drying chamber 200, and a filter component 240 that only allows water vapor to pass through is provided between the feed port 210 and the air outlet 220, and the feed port 210 and the second discharge port 230 are located on the same side of the filter component 240; the calcium hydroxide preparation equipment also includes a gas storage tank 600, the inlet of the gas storage tank 600 is connected to the air outlet 220 and the connecting path is provided with an induced draft fan 830; the outlet of the gas storage tank 600 is connected to the second feed port 120. During the preparation process, after the drying gas carrying the primary product enters the drying chamber, the induced draft fan 830 is activated. The drying gas fully contacts the primary product and carries the superheated water vapor therein, separating it from the calcium hydroxide. The induced draft fan 830 draws a negative pressure into the side of the filter assembly 240 near the induced draft fan 830. Under the influence of the filter assembly 240's permeability selectivity and the pressure differential, the superheated water vapor separated from the calcium hydroxide can pass through the filter assembly 240 and be discharged through the gas outlet 220, where it is stored in the gas storage tank 600. During its flow into the gas storage tank 600 or within the gas storage tank 600, the superheated water vapor is cooled to a predetermined temperature suitable for the digestion reaction. The superheated water vapor in the gas storage tank 600 is then transported through its outlet to the second feed port 120, providing feedstock for the digestion reaction in the reaction chamber. This arrangement allows the superheated water vapor in the product to be recycled as feedstock for the digestion reaction, thereby improving the utilization efficiency of the superheated water vapor, reducing raw material consumption, and lowering production costs.

[0042] Specifically, filter assembly 240 may include a NAA crystal membrane, which has high selectivity for water vapor, allowing superheated water vapor to pass through while blocking calcium hydroxide and dry gas. Alternatively, filter assembly 240 may be any other membrane that exhibits high selectivity for water vapor and allows only water vapor to pass through. Furthermore, control valves are provided at both the inlet and outlet of gas storage tank 600 to adjust their openings.

[0043] Optionally, in this embodiment, if Figure 3As shown, the calcium hydroxide preparation equipment also includes a first heat exchanger 500, which includes a first cold side channel 510 and a first hot side channel 520. The channel inlet of the first cold side channel 510 is connected to the water supply pipe 920, and the channel outlet is connected to the second feed port 120. The channel inlet of the first hot side channel 520 is connected to the air outlet 220 through a connecting pipe 930, and the channel outlet is connected to the inlet of the gas storage tank 600. During the preparation process, ambient temperature water is supplied to the water supply pipe 920 and flows through the first cold-side channel 510. The superheated water vapor discharged through the gas outlet 220 exchanges heat with the ambient temperature water within the first cold-side channel 510 as it flows through the first hot-side channel 520. This cools the superheated water vapor within the first hot-side channel 520 to a predetermined temperature suitable for the digestion reaction and is stored in the gas storage tank 600. Simultaneously, the ambient temperature water within the first cold-side channel 510 heats up and vaporizes into superheated water vapor at a predetermined temperature, which is then fed into the reaction chamber through the second feed port 120. The provision of the first heat exchanger 500 utilizes excess heat from the superheated water vapor discharged from the drying chamber 200, using it as a heat source to heat ambient temperature water, thereby providing raw material superheated water vapor for the digestion reaction. This effectively utilizes heat from the digestion reaction and drying process, reducing the heat loss and increased preparation costs associated with using an additional heat source to heat ambient temperature water to generate process steam.

[0044] Optionally, in this embodiment, if Figure 4 As shown, a first heat exchange assembly 140 is provided within the digestion reaction chamber 100, wherein the first heat exchange assembly 140 includes a first heat exchange channel for a heat exchange medium to flow through. A second heat exchange assembly 250 is provided within the drying chamber 200, wherein the second heat exchange assembly 250 includes a second heat exchange channel connected to the channel outlet of the first heat exchange channel. During the calcium hydroxide preparation process, a heat exchange medium is introduced into the first heat exchange channel and flows sequentially through the first heat exchange channel and the second heat exchange channel. Within the reaction chamber, a large amount of heat is released during the digestion reaction between calcium oxide and superheated steam. This heat can be transferred to the heat exchange medium in the first heat exchange channel through heat exchange via the first heat exchange assembly 140 to produce a high-temperature working medium. The high-temperature working medium then flows into the second heat exchange channel and is transferred to the gas and solid in the drying chamber through heat exchange via the second heat exchange assembly 250. This effectively utilizes the heat generated by the digestion reaction and maintains a high-temperature drying environment within the drying chamber by heating the drying chamber to improve the drying effect of the primary product in the drying chamber 200, thereby correspondingly improving the purity of the calcium hydroxide product.

[0045] The heat exchange medium flowing out of the second heat exchange channel can be discharged to a designated location, and preferably, can flow back into the first heat exchange channel to achieve heat exchange medium recycling. Specifically, the temperature within the drying chamber can be maintained at approximately 500°C, the temperature of the superheated water vapor discharged through the outlet 220 is approximately 500°C, and the temperature of the superheated water vapor after passing through the first heat exchanger 500 is approximately 150°C.

[0046] In this embodiment, Figure 5 As shown, the calcium hydroxide preparation equipment also includes a second heat exchanger 400, which includes a second hot side channel 410 and a second cold side channel 420. The channel inlet of the second hot side channel 410 is connected to the channel outlet of the first heat exchange channel, and the channel inlet of the second cold side channel 420 is connected to the air supply pipe 910, and the channel outlet is connected to the air delivery port 310. During the preparation process, ambient temperature gas is introduced through gas supply pipe 910. A portion of the high-temperature medium in the first heat exchange channel is diverted to the second heat exchange channel to maintain the high temperature environment in the drying chamber. The remaining portion is diverted to the second hot-side channel 410 for heat exchange with the ambient temperature gas in the second cold-side channel 420, heating the ambient temperature gas to a predetermined temperature to dry the primary product. The second heat exchanger 400 further utilizes the heat generated by the digestion reaction in the reaction chamber as a heat source for the drying gas, eliminating the need for an additional heat source. The heat generated by the digestion reaction in the reaction chamber can be used as a heat source for the drying gas through the second heat exchanger 400, as a heat source for the drying chamber through the second heat exchange assembly 250, and indirectly as a heat source for superheated steam through the first heat exchanger 500. This eliminates the need for an external heat source during operation, completing the digestion reaction and drying process through self-heating, resulting in high efficiency, low heat consumption, and enhanced practicality. Specifically, the drying gas temperature can approach 550°C.

[0047] Among them, the heat exchange medium flowing out through the second hot side channel 410 can be discharged to a designated location, and preferably, can flow back to the first heat exchange channel to realize the recycling of the heat exchange medium without the need for continuous input of the heat exchange medium. Specifically, the first heat exchange component 140 can use a wall-mounted heat exchanger, and the wall-mounted heat exchanger is two pieces. The two wall-mounted heat exchangers are arranged opposite to each other in the reaction chamber, and the first heat exchange channel in one of them is used to communicate with the second heat exchange channel, and the first heat exchange channel in the other is used to communicate with the second hot side channel 410; of course, the wall-mounted heat exchanger can also be a piece, in which two first heat exchange channels are arranged to communicate with the second heat exchange channel and the second hot side channel 410 respectively, or only one first heat exchange channel is arranged, and two branches are arranged at the output end of the first heat exchange channel, and the two branches are connected to the first heat exchange channel and the second hot side channel 410 in a one-to-one correspondence.

[0048] Of course, the first heat exchange assembly 140 , the second heat exchange assembly 250 , the first heat exchanger 500 and the second heat exchanger 400 may also be plate heat exchangers, partition-type heat exchangers, etc.

[0049] In this embodiment, Figure 1-Figure 5 As shown, the section of the delivery pipeline 300 located between the gas delivery port 310 and the input port 330 includes a constricted section 340, with the constricted end of the constricted section 340 facing the input port 330. The constricted section 340 forms a Venturi tube section. After the dry gas enters the constricted section 340, the flow rate of the dry gas gradually increases as the flow cross-section of the constricted section 340 decreases. As the dry gas flows out through the constricted end of the constricted section 340, the space within the pipeline instantly increases. A negative pressure condition occurs within the delivery pipeline section on the constricted end of the constricted section 340, i.e., in the area where the input port 330 is located. Due to the pressure differential across the constricted section, the primary product within the reaction chamber can flow more smoothly and quickly into the delivery pipeline section and, driven by the dry gas, into the drying chamber. The provision of the constricted section 340 effectively increases the speed and smoothness with which the primary product within the reaction chamber flows into the delivery pipeline, reducing the likelihood of the primary product remaining within the reaction chamber.

[0050] Optionally, in this embodiment, if Figure 1-Figure 5 As shown, a flared nozzle 260 is provided on the periphery of the feed port 210, and the output port 320 is matingly connected to the flared end of the nozzle 260. The primary product in the conveying pipeline 300, carried by the drying gas, enters the nozzle 260. The nozzle 260 is tapered in the direction toward the feed port 210. As the airflow carrying the primary product flows through the nozzle 260, the flow rate gradually increases. Furthermore, due to the increased space in the drying chamber, the instantaneous pressure of the airflow out of the nozzle 260 and the feed port 210 decreases. The volume of the superheated water vapor in the airflow mixing system expands rapidly, expanding the gaps in the calcium hydroxide at the mesoscopic scale, making the calcium hydroxide more loose. Accordingly, the drying gas can more fully contact the calcium hydroxide to dry it, thereby further improving the drying effect of the drying device on the calcium hydroxide, thereby obtaining a higher purity calcium hydroxide product.

[0051] In this embodiment, Figure 1-Figure 5As shown, the filter assembly 240 can be located at the top of the drying chamber 200. A first baffle 270 is provided on a first side wall of the drying chamber 200, and a second baffle 280 is provided on a second side wall opposite the first side wall. The first baffles 270 and the second baffles 280 are arranged alternately in the vertical direction, and both extend toward each other and are inclined downward. The airflow carrying the primary product in the conveying pipe flows into the drying chamber at a high speed at the inlet 210 and collides with the first baffle 270 and the second baffle 280 located in the upper area. The loose calcium hydroxide is rapidly crushed into smaller particles by the high-speed collision with the first baffle 270 and the second baffle 280. The initially crushed calcium hydroxide particles can roll to the next baffle under their own gravity and the guidance of the first baffle 270 or the second baffle 280. After being collided and crushed by all the baffles, they are discharged through the second discharge port 230. The arrangement of the first baffle 270 and the second baffle 280 enables the drying device to have a better crushing function on the primary product on the basis of drying the primary product. In addition, during the crushing process, as the calcium hydroxide is crushed, the contact area and sufficiency between the drying gas and the calcium hydroxide are higher, and the drying effect is correspondingly better, thereby greatly improving the performance of the drying device. Without the need for additional crushing treatment, a calcium hydroxide product with better purity and particle size quality is obtained.

[0052] Preferably, the top surfaces of the first baffle 270 and the second baffle 280 can be configured to have concave-convex shapes or sharp corners to increase friction and shear force, thereby correspondingly improving the impact crushing effect on the calcium hydroxide. Specifically, the particle size of the crushed calcium hydroxide can be 18 to 20 mm.

[0053] This embodiment also provides a calcium hydroxide preparation process, which uses the above-mentioned calcium hydroxide preparation equipment. The calcium hydroxide preparation process includes: digestion reaction: calcium oxide and superheated water vapor are sent as reaction raw materials into the digestion reaction chamber 100 for mixing and reacting to generate a primary product; drying treatment: the dry gas in the conveying pipeline 300 carries the primary product into the drying chamber 200, and the primary product is dried to separate the superheated water vapor from the calcium hydroxide. The dried calcium hydroxide is output through the second discharge port 230.

[0054] This calcium hydroxide preparation process uses superheated water vapor as a raw material to react with calcium oxide for a digestion reaction. This process improves the contact between calcium oxide and superheated water vapor, thereby increasing the degree of the digestion reaction, reducing the calcium oxide content in the primary product and correspondingly increasing the calcium hydroxide content and purity of the primary product. Furthermore, the process effectively controls the reaction rate of the digestion reaction to produce a calcium hydroxide product with a smaller particle size, thereby reducing the subsequent crushing load of the calcium hydroxide product and reducing the tendency of the product to adhere to and solidify on the walls of the reaction chamber due to a more intense reaction, thereby reducing the effective volume of the reaction chamber and even causing blockage. Furthermore, the process effectively improves the fluidity and specific surface area of ​​the calcium hydroxide in the primary product, thereby increasing the contact between the primary product and the drying gas in the delivery pipeline 300 and the drying chamber, thereby improving the drying effect of the drying gas on the calcium hydroxide in the primary product and producing a high-purity calcium hydroxide product. Furthermore, while achieving controlled reaction rate, the process eliminates the need to add other ingredients to the raw materials, thereby reducing the complex operations of subsequent separation and purification of the product mixture and improving the convenience of calcium hydroxide preparation.

[0055] Specifically, in the digestion reaction, the molar ratio of calcium oxide to superheated water vapor is 1:1.05 to 1:1.15, preferably 1:1.1. In the digestion reaction of calcium oxide and superheated water vapor, the molar ratio of the two is 1:1. A relatively large amount of superheated water vapor is input into the reaction chamber to ensure sufficient contact and reaction between the superheated water vapor and the calcium oxide, so that the input calcium oxide raw material can fully and completely react, thereby reducing the content of calcium oxide in the primary product and obtaining calcium hydroxide of higher purity.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A calcium hydroxide preparation device, characterized in that, include: A digestion reaction chamber (100), wherein a cavity wall of the digestion reaction chamber (100) is provided with a first feed port (110) for inputting calcium oxide and a second feed port (120) for inputting superheated water steam, and a bottom wall is provided with a first discharge port (130); A drying chamber (200), wherein a cavity wall of the drying chamber (200) is provided with an inlet (210), and a bottom wall is provided with a second outlet (230); the drying chamber (200) is further provided with an air outlet (220), a filter assembly (240) that only allows water vapor to pass through is separated between the inlet (210) and the air outlet (220), and the inlet (210) and the second outlet (230) are located on the same side of the filter assembly (240); An air storage tank (600), wherein the inlet of the air storage tank (600) is connected to the air outlet (220) and a draft fan (830) is provided in the connecting passage; the outlet of the air storage tank (600) is connected to the second material delivery port (120); and A delivery pipeline (300) is provided, wherein the first port of the delivery pipeline (300) serves as a gas delivery port (310) for inputting dry gas, the second port serves as an output port (320) connected to the feed port (210), and the pipe wall is provided with an input port (330) connected to the first discharge port (130).

2. calcium hydroxide preparation equipment according to claim 1, is characterized in that, The calcium hydroxide preparation equipment further comprises a first heat exchanger (500), the first heat exchanger (500) comprising a first cold side channel (510) and a first hot side channel (520), the channel inlet of the first cold side channel (510) being connected to a water supply pipe (920), and the channel outlet being connected to the second feed port (120), the channel inlet of the first hot side channel (520) being connected to the gas outlet (220) via a connecting pipe (930), and the channel outlet being connected to the inlet of the gas storage tank (600).

3. calcium hydroxide preparation equipment according to claim 1 or 2, is characterized in that, A first heat exchange component (140) is provided in the digestion reaction chamber (100), and a first heat exchange channel for a heat exchange medium to flow through is provided in the first heat exchange component (140); a second heat exchange component (250) is provided in the drying chamber (200), and a second heat exchange channel connected to the channel outlet of the first heat exchange channel is provided in the second heat exchange component (250).

4. calcium hydroxide preparation equipment according to claim 3, is characterized in that, The calcium hydroxide preparation equipment further includes a second heat exchanger (400), the second heat exchanger (400) including a second hot side channel (410) and a second cold side channel (420), the channel inlet of the second hot side channel (410) being connected to the channel outlet of the first heat exchange channel, the channel inlet of the second cold side channel (420) being connected to an air supply pipe (910), and the channel outlet being connected to the air delivery port (310).

5. calcium hydroxide preparation equipment according to claim 1 or 2, is characterized in that, The pipe section of the delivery pipeline (300) located between the gas delivery port (310) and the input port (330) includes a constricted section (340), and the constricted end of the constricted section (340) faces the input port (330).

6. calcium hydroxide preparation equipment according to claim 1 or 2, is characterized in that, A flared nozzle (260) is provided on the periphery of the feed port (210), and the output port (320) is matched and connected to the flared end of the nozzle (260).

7. calcium hydroxide preparation equipment according to claim 1 or 2, is characterized in that, The filter assembly (240) is located at the top of the drying chamber (200); a first side wall of the drying chamber (200) is provided with a first baffle (270); a second side wall opposite to the first side wall is provided with a second baffle (280); the first baffle (270) and the second baffle (280) are alternately arranged in an up-down direction, and both extend toward each other and are inclined downward.

8. A process for preparing calcium hydroxide, characterized in that: The calcium hydroxide preparation equipment according to any one of claims 1 to 7 is used, and the calcium hydroxide preparation process comprises: Digestion reaction: calcium oxide and superheated steam are fed as reaction raw materials into a digestion reaction chamber (100) to mix and react to generate primary products; Drying treatment: The drying gas in the conveying pipeline (300) carries the primary product into the drying chamber (200), and the primary product is dried to separate the superheated water vapor from the calcium hydroxide. The dried calcium hydroxide is output through the second discharge port (230).

9. calcium hydroxide preparation technology according to claim 8, is characterized in that, In the digestion reaction, the molar ratio of calcium oxide to superheated water vapor is 1:1.05 to 1:1.15.

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