A desulfurized gypsum upgrading hydrothermal synthesis sectional reactor

Abstract

The present application relates to a desulfurization gypsum upgrading technology field, specifically relates to a kind of desulfurization gypsum upgrading hydrothermal synthesis sectional reactor, including sequentially connected and assembled mixed incubation device and sectional pressurized reaction device.Mixed incubation device includes the premixing reactor with steam injection mixed into material port and fast stirring mixing device.Sectional pressurized reaction device includes pressurized reactor, material rolling throwing and transport device and steam spraying device.Pressurized reactor has rotatable barrel, barrel is configured with main reaction zone and residual reaction zone;And the arrangement density of the pipe steam injection port of main reaction zone is greater than the arrangement density of the pipe steam injection port of residual reaction zone.The present application realizes the sufficient mixing reaction of gypsum slurry in pressurized reactor on the basis of reducing energy consumption, solves the problems, such as product quality fluctuation, relatively low strength, large energy consumption and low reaction efficiency in the process of traditional autoclaved process and high-pressure aqueous solution method upgrading preparation α-hemihydrate gypsum.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desulfurization gypsum upgrading, and particularly relates to a desulfurization gypsum upgrading hydrothermal synthesis sectional reactor. BACKGROUND

[0002] Desulfurization gypsum is a solid waste produced in the desulfurization process of coal-fired power plants, and its main component is similar to natural gypsum, which is calcium sulfate dihydrate. The production of desulfurization gypsum increases significantly with the rapid development of industry. The traditional piling and landfill treatment method leads to a continuous increase in the stockpile, which not only occupies a large amount of land resources, but also causes serious pollution to groundwater and the environment. The recycling and resource utilization of desulfurization gypsum can not only create economic value, but also reduce the discharge and accumulation of solid waste, reduce the exploitation and consumption of natural gypsum resources, and save natural resources.

[0003] Compared with natural gypsum, desulfurization gypsum contains more impurities, which limits its direct use in many material fields. Therefore, desulfurization gypsum needs to be upgraded for better resource utilization. The most promising and beneficial approach in the resource utilization of desulfurization gypsum is to prepare high-strength, high-performance and high-value-added alpha-hemihydrate gypsum, which has a chemical formula of alpha-CaSO4·0.5H2O. Alpha-hemihydrate gypsum can be obtained through a dissolution and crystallization mechanism of dihydrate gypsum. Specifically, 1.5 molecules of crystalline water are removed from the lattice of dihydrate gypsum through suitable heat treatment conditions in a saturated water vapor medium or aqueous solution, and the hemihydrate gypsum crystals are dissolved in the surrounding environment. When the liquid phase hemihydrate gypsum concentration reaches saturation, the liquid hemihydrate gypsum rapidly crystallizes to form coarse and dense alpha-hemihydrate gypsum crystals.

[0004] The mainstream process method for preparing alpha-hemihydrate gypsum from desulfurization gypsum is autoclaving and high-pressure aqueous solution method. Autoclaving is to grind desulfurization gypsum into powder, then place it in an autoclave, and then pass in high-pressure saturated steam under certain temperature and pressure conditions. After a certain period of time, the crystal transformation reaction is completed, and alpha-hemihydrate gypsum is obtained. The high-pressure aqueous solution method is to mix desulfurization gypsum, water and crystal control agent into slurry, and then put it into a high-pressure kettle. After stirring and heating to 120-160 DEG C, the reaction is carried out under the pressure of 0.2-0.8 MPa for a period of time. After dehydration and crystal transformation, alpha-hemihydrate gypsum is obtained. However, in the process of upgrading desulfurization gypsum by using autoclaving and high-pressure aqueous solution method, the reaction process of obtaining alpha-hemihydrate gypsum from dihydrate gypsum dissolution and crystallization has high sensitivity to reaction conditions such as temperature and time. The local alpha-hemihydrate gypsum growth uniformity and crystallinity fluctuate with the change of reaction temperature and reaction time. At the same time, the desulfurization gypsum slurry is thick and easy to settle and agglomerate, which affects the heat transfer and the local reaction time and heating state. Therefore, the reaction process and product performance are not easy to control, the product quality fluctuates greatly, the strength is relatively low, the energy consumption is large, the product added value is low, and it is not conducive to commercial promotion.

[0005] In addition, the device for preparing alpha-hemihydrate gypsum by upgrading desulfurization gypsum by using traditional autoclaving method and high-pressure aqueous solution method has large energy consumption, long preparation time, low reaction efficiency and low economic efficiency of reaction system, which is not conducive to large-scale continuous production. SUMMARY

[0006] In order to solve the problems of large product quality fluctuation, relatively low strength, large energy consumption and low reaction efficiency in the process of preparing alpha-hemihydrate gypsum by upgrading desulfurization gypsum by using traditional autoclaving method and high-pressure aqueous solution method, the purpose of the present application is to provide a desulfurization gypsum upgrading hydrothermal synthesis sectional reactor.

[0007] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows.

[0008] The present application provides a desulfurization gypsum upgrading hydrothermal synthesis sectional reactor, which comprises a mixing and incubation device and a sectional pressurized reaction device connected and assembled in sequence; the mixing and incubation device comprises a premixing reactor, a rapid stirring and mixing device and a material transportation and throwing component; the premixing reactor is provided with a steam injection and mixing inlet and is configured to preheat and mix steam and reaction raw materials; the rapid stirring and mixing device is arranged in the premixing reactor and is used for uniformly mixing gypsum slurry and steam; and the material transportation and throwing component is arranged at the tail of the premixing reactor and is used for transporting gypsum slurry in a uniformly mixed state between the premixing reactor and the pressurized reactor.

[0009] The sectional pressurized reaction device comprises a pressurized reactor, a material tumbling, throwing and transporting device and a steam spraying device; the pressurized reactor is provided with a rotatable cylinder; the cylinder is provided with a main reaction zone and a residual reaction zone; the material tumbling, throwing and transporting device is fixed to the inner wall of the cylinder and is used for tumbling, throwing and mixing and transporting gypsum slurry; and the steam spraying device is rotatably arranged in the axial direction of the pressurized reactor; the steam spraying device comprises a plurality of pipeline steam injection ports arranged in the direction of gypsum slurry movement, and the arrangement density of the pipeline steam injection ports in the main reaction zone is greater than that of the pipeline steam injection ports in the residual reaction zone.

[0010] The desulfurization gypsum upgrading hydrothermal synthesis sectional reactor of the present application mainly comprises a first section and a second section; the first section is a mixing and incubation device, and the second section is a sectional pressurized reaction device.

[0011] The mixing and incubation device mainly focuses on preheating and mixing before reaction. By fully mixing before reaction, it is ensured that the mixture is fully mixed before reaction, so as to control the uniformity of reaction temperature and reaction time. In addition, by pre-mixing reaction raw materials and steam through the mixing and incubation device, the total reaction time can be reduced, the reaction efficiency can be improved, and the purpose of reducing energy consumption can be achieved.

[0012] The segmented pressurized reaction device mainly focuses on the reaction. The reaction has a large space, and the reaction time is sufficient in the process of continuous feeding. Through the cooperation of the pressurized reactor, the material rolling and throwing transportation device and the steam spraying device, the sufficient mixing of steam and slurry in the reaction process is ensured, and the mixed state of the gypsum slurry without settlement and agglomeration is ensured. Due to the endothermic reaction, the local temperature will decrease during the reaction process, and the uniform heating can ensure the uniform heating.

[0013] The present application can effectively control the reaction temperature and reaction time by the cooperation of the mixing inoculation device and the segmented pressurized reaction device, realize the sufficient mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoid the agglomeration and uneven mixing of the gypsum slurry, and affect the product quality due to insufficient reaction, solve the problems of large product quality fluctuation, relatively low strength, large energy consumption and low reaction efficiency in the process of preparing alpha-hemihydrate gypsum by traditional autoclaved process and high-pressure aqueous solution process.

[0014] The segmented pressurized reaction device of the present application can match the reaction rate of the gypsum slurry in the pressurized reactor mainly by adjusting the arrangement density of the pipeline steam spray ports in the main reaction zone and the residual reaction zone. The arrangement density of the pipeline steam spray ports in the main reaction zone is greater than that in the residual reaction zone, so that dense steam injection can be formed in the main reaction zone to break up the agglomerated slurry and make it fully contact with steam for reaction. In the residual reaction zone, only a small amount of steam is needed to meet the reaction demand because most of the reaction has been completed, and the sparse steam spraying port arrangement in the residual reaction zone can improve the steam utilization rate.

[0015] The material rolling and throwing transportation device can help to roll, throw and mix the gypsum slurry in the cylinder, cooperate with the dense steam injection, further break up the agglomerated slurry, make the slurry fully contact with the steam, and make the gypsum slurry transport along the direction of the gypsum slurry in the process of rolling, throwing and mixing by the guiding action of the internal screw belt.

[0016] The gypsum slurry in the cylinder is subjected to zoned rolling, throwing and mixing and heat treatment, which can realize the sufficient mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoid the agglomeration and uneven mixing of the gypsum slurry, and affect the product quality due to insufficient reaction.

[0017] Preferably, the height-diameter ratio of the premixing reactor is 3:2-1.

[0018] The present application adopts a lean and high structure for the premixing reactor, and the height-diameter ratio is between 3:2 and 1. The narrow and long space can ensure that the steam and the gypsum slurry are quickly contacted in a very short time.

[0019] Preferably, the rapid stirring mixing device realizes axial and circumferential mixing through high-speed downward and frame stirring mixing structure, ensures rapid mixing in a short time of about 3-10 minutes, fully preheats before reaction, and ensures uniform heating of the slurry during the reaction.

[0020] Preferably, the rotating direction of the steam spraying device is opposite to the rotating direction of the barrel.

[0021] In the application, the material tumbling and throwing transportation device and the inner wall of the barrel form an accumulation groove of the gypsum slurry; because the rotating direction of the steam spraying device is opposite to the rotating direction of the barrel, the multiple pipeline steam nozzles of the steam spraying device can fully contact the gypsum slurry in the accumulation groove, and the sprayed steam can break the agglomerated slurry and make the slurry react with the fully contacted steam.

[0022] Preferably, the material tumbling and throwing transportation device comprises:

[0023] The baffles are arranged on the inner wall of the barrel in a circumferential direction; the inner helical belts are arranged on the two side walls of the corresponding baffles in the gypsum slurry running direction, and are configured to transport the gypsum slurry in the barrel in the gypsum slurry running direction.

[0024] In the application, the accumulation groove of the gypsum slurry between the baffles and the inner wall of the barrel helps to tumble and throw the gypsum slurry in the barrel; in combination with the sprayed steam, the agglomerated slurry is further broken, and the slurry reacts with the fully contacted steam. The inner helical belt is mainly arranged to guide the gypsum slurry to run in the gypsum slurry running direction during the tumbling and throwing mixing process.

[0025] Preferably, the multiple inner helical belts are arranged on the side walls of the corresponding baffles at equal intervals; the arrangement direction of each inner helical belt forms an acute angle with the gypsum slurry running direction. Preferably, the arrangement direction of each inner helical belt forms an angle of 30-60° with the gypsum slurry running direction.

[0026] In the application, the arrangement direction of each inner helical belt is arranged according to the rotating direction of the barrel and the gypsum slurry running direction, so that the gypsum slurry in the barrel can fully contact the steam in the gypsum slurry running direction, the agglomerated slurry is broken by the steam, and the slurry reacts with the steam.

[0027] Preferably, the arrangement density of the pipeline steam nozzle of the main reaction zone is 300-600 mm per nozzle; and the arrangement density of the pipeline steam nozzle of the residual reaction zone is 1000-1500 mm per nozzle.

[0028] In the application, the cylinder is sequentially divided into a main reaction zone and a residual reaction zone along the direction of gypsum slurry travel.

[0029] The application can match the reaction rate of gypsum slurry in the pressurized reactor by adjusting the arrangement density of the pipeline steam nozzle in the main reaction zone and the residual reaction zone. The arrangement density of the steam nozzle in the main reaction zone is 300-600 mm per nozzle, and the arrangement density of the steam nozzle in the residual reaction zone is 1000-1500 mm per nozzle. Since the reaction rate gradually slows down from the front end to the rear end of the pressurized reactor, the reaction mainly occurs in the main reaction zone. The dense steam nozzles can meet the reaction requirement and can break the agglomerated slurry to make it fully contact with steam for reaction. In the residual reaction zone, most of the reaction has been completed, and only a small amount of steam is needed to meet the reaction requirement. The sparse steam nozzles in the residual reaction zone can improve the steam utilization rate.

[0030] Preferably, the steam spraying device comprises a steam pipeline, one end of the steam pipeline is rotatably connected to one end of the pressurized reactor, the other end of the steam pipeline is movably and sealingly connected to the other end of the pressurized reactor and extends out of the pressurized reactor, and a plurality of pipeline steam nozzles are alternately arranged on the steam pipeline in a circumferential 45° angle arrangement mode and communicate with the steam pipeline.

[0031] Preferably, the arrangement density of the pipeline steam nozzle gradually decreases along the direction of gypsum slurry travel.

[0032] Therefore, by adjusting the arrangement density of the pipeline steam nozzle in the main reaction zone and the residual reaction zone, the reaction rate of gypsum slurry in the pressurized reactor can be matched to improve the steam utilization rate.

[0033] Preferably, the application further comprises a driving device, which comprises:

[0034] a first driving unit arranged on one side of the cylinder, the first driving unit being capable of driving the cylinder to rotate; and a second driving unit arranged on one side of the part of the steam spraying device extending out of the pressurized reactor, the second driving unit being capable of driving the steam spraying device to rotate.

[0035] Preferably, the pressurized reactor comprises a feeding end cover and a discharging end cover, which are arranged at two ends of the barrel respectively and are connected with the barrel in a dynamic sealing mode; the feeding end cover is provided with a feeding port, and the discharging end cover is provided with a fixed discharging port; the mixed inoculation device is provided with a material conveying and throwing component which is fixedly connected with the feeding port.

[0036] Preferably, the feeding end cover is provided with a second dynamic sealing component, and the discharging end cover is provided with a supporting bearing component; one end of the steam spraying device is mounted on the supporting bearing component, and the other end of the steam spraying device penetrates through the second dynamic sealing component; the included angle between the axial direction of the pressurized reactor and the horizontal direction is an acute angle. Preferably, the included angle between the axial direction of the pressurized reactor and the horizontal direction is 10°-30°.

[0037] The beneficial effects of the present application are as follows:

[0038] 1. The present application can effectively control the reaction temperature and reaction time by the cooperation of the mixed inoculation device and the segmented pressurized reaction device, realize the full mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoid the agglomeration and uneven mixing of the gypsum slurry, and thus avoid the insufficient reaction and the influence on the product quality, and solve the problems of the traditional autoclaved process and the high-pressure aqueous solution process for preparing alpha-hemihydrate gypsum, such as large product quality fluctuation, relatively low strength, large energy consumption and low reaction efficiency.

[0039] 2. The present application can match the reaction rate of the gypsum slurry in the pressurized reactor by adjusting the arrangement density of the pipeline steam injection ports in the main reaction zone and the residual reaction zone. The arrangement density of the pipeline steam injection ports in the main reaction zone is greater than that in the residual reaction zone, so that dense steam injection can be formed in the main reaction zone to break the agglomerated slurry and make it fully contact with steam for reaction; and in the residual reaction zone, since most of the reaction has been completed, only a small amount of steam is needed to meet the reaction demand, and the sparse steam injection port arrangement in the residual reaction zone can improve the steam utilization rate.

[0040] 3. The material tumbling, throwing and conveying device of the present application can help to tumble, throw and mix the gypsum slurry in the barrel, cooperate with the dense steam injection, further break the agglomerated slurry, and make the slurry react with the fully contacted steam, and at the same time, the gypsum slurry can be transported along the direction of the gypsum slurry by the guiding action of the internal spiral belt in the process of tumbling, throwing and mixing.

[0041] 4、The desulfurization gypsum upgrading hydrothermal synthesis sectional type reactor can help the nucleation and growth of alpha-hemihydrate gypsum crystal grains, ensure uniform crystal form and stable quality, and help to produce products with high compressive strength. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a sectional view of the structure of the desulfurization gypsum upgrading hydrothermal synthesis sectional type reactor provided by the embodiment of the present application.

[0043] Marked for explanation:

[0044] 1, agitator drive unit; 2, steam injection mixing inlet; 3, premixing reactor; 4, fast stirring mixing device; 5, material transportation and throwing component; 6, first safety valve; 7, first exhaust unit; 8, first pressure measurement and control unit; 9, first temperature measurement and control unit; 10, dynamic sealing component; 11, power gear; 12, pressurized reactor; 13, steam spraying device; 14, material tumbling, throwing and transporting device; 15, second exhaust unit; 16, second pressure measurement and control unit; 17, second safety valve; 18, support bearing component; 19, second temperature measurement and control unit; 20, fixed discharge port; 21, fixed support structure; 22, rolling support structure; 23, first drive unit; 24, second drive unit; 25, second dynamic sealing component; 26, steam inlet; 27, support sealing structure. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0046] Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0047] The technical scheme of the present application will be further described below through specific examples. In each of the following examples, the method is a conventional method unless otherwise specified; the reagents and materials can be purchased on the market unless otherwise specified.

[0048] As Figure 1 A desulfurization gypsum upgrading hydrothermal synthesis sectional type reactor, comprising a mixing and inoculation device and a sectional type pressurized reaction device connected and assembled in sequence.

[0049] The mixed incubation device comprises a premixing reactor 3, a rapid stirring mixing device 4 and a material transportation and throwing component 5.

[0050] The segmented pressurized reaction device comprises a pressurized reactor 12, a steam spraying device 13 and a material tumbling, throwing and transportation device 14.

[0051] Specifically, the hydrothermal synthesis segmented reactor for upgrading desulfurized gypsum mainly comprises a first segment and a second segment.

[0052] The mixed incubation device mainly focuses on preheating and mixing before reaction.

[0053] The segmented pressurized reaction device mainly focuses on reaction.

[0054] Specifically, the embodiment of the present application can effectively control the reaction temperature and reaction time by matching the mixing nucleating device and the segmented pressurized reaction device, realize the full mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoid the agglomeration and uneven mixing of the gypsum slurry, and thus avoid the insufficient reaction and the influence on the product quality.

[0055] Specifically, the segmented pressurized reaction device of the embodiment of the present application can match the reaction rate of the gypsum slurry in the pressurized reactor by adjusting the arrangement density of the pipeline steam injection ports in the main reaction zone and the residual reaction zone. The arrangement density of the pipeline steam injection ports in the main reaction zone is greater than that in the residual reaction zone, so that dense steam injection can be formed in the main reaction zone to break the agglomerated slurry and make it fully contact with steam for reaction. In the residual reaction zone, only a small amount of steam is needed to meet the reaction demand because most of the reaction has been completed, and the sparse steam injection port arrangement in the residual reaction zone can improve the steam utilization rate.

[0056] Specifically, the material tumbling and throwing transport device can help the gypsum slurry in the cylinder to tumble and throw and mix, and cooperate with the dense steam injection to further break the agglomerated slurry and make the slurry react with the fully contacted steam. At the same time, the gypsum slurry can be transported along the direction of the gypsum slurry by the guiding action of the internal screw belt during the tumbling and throwing mixing process.

[0057] Specifically, the embodiment of the present application can realize the full mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption by partitioning the tumbling and throwing mixing and heat treatment of the gypsum slurry in the cylinder, and avoid the agglomeration and uneven mixing of the gypsum slurry, which leads to insufficient reaction and affects the product quality.

[0058] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the height-diameter ratio of the premixing reactor 3 is 3:2-1.

[0059] Specifically, the embodiment of the present application adopts a lean and high structure for the premixing reactor, and the height-diameter ratio is between 3:2-1. The narrow and long space can ensure that the steam and the gypsum slurry are quickly contacted in a very short time.

[0060] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the fast stirring and mixing device 4 adopts a high-speed stirring and mixing structure, and the stirring and mixing structure is a down-pressing type and a frame type stirring structure for realizing axial and circumferential mixing.

[0061] Specifically, the fast stirring and mixing device 4 of the embodiment of the present application adopts a high-speed stirring and mixing structure, and performs axial and circumferential mixing through down-pressing and frame stirring, so as to ensure fast mixing in a short time of about 3-10 minutes, fully preheat before reaction, and ensure uniform heating of the slurry during the reaction.

[0062] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the rotating direction of the steam spraying device 13 is opposite to the rotating direction of the cylinder.

[0063] Specifically, the material tumbling and throwing transport device and the inner wall of the cylinder form an accumulation tank of gypsum slurry; since the rotating direction of the steam spraying device is opposite to the rotating direction of the cylinder, the multiple pipeline steam nozzles of the steam spraying device can fully contact the gypsum slurry in the accumulation tank, and the sprayed steam can break the agglomerated slurry and make the slurry react with the fully contacted steam.

[0064] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the material tumbling and throwing transport device 14 includes baffles and internal screw belts.

[0065] The baffles are multiple, and the multiple baffles are respectively arranged on the inner wall of the cylinder in the circumferential direction.

[0066] The internal screw belts are multiple, and the multiple internal screw belts are arranged on the two side walls of the corresponding baffles in the gypsum slurry running direction, and are configured to transport the gypsum slurry in the cylinder in the gypsum slurry running direction.

[0067] Specifically, the accumulation tank of gypsum slurry between the baffles and the inner wall of the cylinder helps to tumble and throw the gypsum slurry in the cylinder; in combination with the sprayed steam, the agglomerated slurry is further broken, and the slurry reacts with the fully contacted steam. The internal screw belt is mainly arranged to guide the gypsum slurry to run in the gypsum slurry running direction during the tumbling and throwing mixing of the gypsum slurry.

[0068] Specifically, the embodiment of the present application mainly uses the mixed inoculation device for sufficient stirring and mixing, uses the internal screw belt of the sectional pressure reaction device for rolling stirring, uses six baffles to throw and tumble the desulfurized gypsum slurry, uses the steam spraying device rotating at the center of the cylinder to ensure uniform spraying of the steam, fully mixes the steam and the desulfurized gypsum slurry, and makes the steam fully contact with the desulfurized gypsum slurry to help the nucleation and growth of α-hemihydrate gypsum grains.

[0069] The desulfurization gypsum upgrading hydrothermal synthesis sectional reactor provided by the embodiment of the present application can realize sufficient conversion reaction, and through the combination of grading premixing and multiple stirring modes, the steam and the slurry gypsum can be ensured to be fully contacted and reacted, thereby providing a feasible hydrothermal synthesis alpha-hemihydrate gypsum preparation equipment for desulfurization gypsum upgrading and resource utilization.

[0070] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the plurality of inner spiral bands are arranged at equal intervals on the side wall of the corresponding baffle; the arrangement direction of each inner spiral band is an acute angle with the gypsum slurry running direction.

[0071] Specifically, the arrangement direction of each inner spiral band is arranged according to the rotation direction of the cylinder and the gypsum slurry running direction, so that the gypsum slurry in the cylinder can be transported along the gypsum slurry running direction while being fully contacted with the steam, and the agglomerated slurry is broken by the steam and reacts.

[0072] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the arrangement density of the pipeline steam spray port of the main reaction zone is 300mm / each~600mm / each; the arrangement density of the pipeline steam spray port of the residual reaction zone is 1000mm / each~1500mm / each.

[0073] Specifically, along the gypsum slurry running direction, the cylinder is sequentially divided into a main reaction zone and a residual reaction zone. The main reaction zone is arranged at one end of the cylinder close to the mixing and incubation device, and the residual reaction zone is arranged at one end of the cylinder away from the mixing and incubation device.

[0074] Specifically, by adjusting the arrangement density of the pipeline steam spray port in the main reaction zone and the residual reaction zone, the reaction rate of the gypsum slurry in the pressurized reactor can be matched. The arrangement density of the steam spray port in the main reaction zone is 300mm / each~600mm / each, and the arrangement density of the steam spray port in the residual reaction zone is 1000mm / each~1500mm / each. Since the reaction rate gradually slows down from the front end to the rear end of the pressurized reactor, the reaction mainly occurs in the main reaction zone, and the dense steam spray port can meet the required amount of reaction. At the same time, the dense steam injection in the main reaction zone can break the agglomerated slurry, so that it can fully contact the steam and react. In the residual reaction zone, most of the reaction has been completed, and only a small amount of steam is needed to meet the reaction demand, and the sparse steam spray port arrangement in the residual reaction zone can improve the steam utilization rate.

[0075] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the steam spraying device 13 comprises a steam pipe, one end of the steam pipe is rotatably connected with one end of the pressurized reactor 12; the other end of the steam pipe is movably sealed with the other end of the pressurized reactor 12 and extends out of the pressurized reactor 12; and a plurality of pipe steam nozzles are alternately arranged on the steam pipe at a circumferential 45° angle arrangement and are in communication with the steam pipe.

[0076] Specifically, the end of the steam pipe extending out of the pressurized reactor 12 is configured as a steam inlet 26 and is externally connected with a steam system. The steam spraying device 13 is arranged at the axial center of the barrel of the pressurized reactor 12 and is driven in the opposite direction of the rotation of the barrel by the second driving unit 24. The steam pipe is supported by the support bearing part 18 at the rear end head and is connected with the pipe of the steam system externally connected with the steam inlet 26 and the front section of the pressurized reactor 12 through the second movable sealing part 25.

[0077] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the arrangement density of the pipe steam nozzles gradually decreases along the direction of the gypsum slurry.

[0078] Specifically, the embodiment of the present application can match the reaction rate of the gypsum slurry in the pressurized reactor by adjusting the arrangement density of the pipe steam nozzles in the main reaction zone and the residual reaction zone, so as to improve the utilization rate of steam.

[0079] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the driving device further comprises a first driving unit 23 and a second driving unit 24.

[0080] The first driving unit 23 is arranged on one side of the barrel and can drive the barrel to rotate. Specifically, the first driving unit 23 is a first driving unit, for example, a motor. Specifically, the pressurized reactor 12 is placed horizontally, the barrel is rotatable, the power gear 11 is arranged at the center of the outer wall surface of the barrel, the first driving unit 23 has a driving gear, the driving gear is engaged with the power gear 11, thereby the driving gear is rotated by the first driving unit 23, so as to drive the power gear 11 to rotate.

[0081] The second driving unit 24 is arranged on one side of the part of the steam spraying device 13 extending out of the pressurized reactor 12 and can drive the steam spraying device 13 to rotate.

[0082] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the pressurized reactor 12 comprises a feed end cover and a discharge end cover, which are arranged at the two ends of the barrel and are connected with the barrel through dynamic sealing; the feed end cover is provided with a feed port, and the discharge end cover is provided with a fixed discharge port 20; the mixed inoculation device is provided with a material conveying and throwing component 5, which is fixedly connected with the feed port.

[0083] Specifically, the barrel rear side is supported through a rolling support structure 22, the material conveying and throwing component 5 at the front end of the barrel and the fixed discharge port 20 at the rear end of the barrel are both fixed and stationary, the rear end of the pressurized reactor 12 is equipped with the fixed discharge port 20, and the built-in funnel type discharge is adopted. The feed end cover of the pressurized reactor 12 is connected with the barrel through a first dynamic sealing component 10 to realize relative movement, and the discharge end cover of the pressurized reactor 12 is supported through a fixed support structure 21.

[0084] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the feed end cover is provided with a second dynamic sealing component 25, and the discharge end cover is provided with a support bearing component 18; one end of the steam spraying device 13 is mounted on the support bearing component 18, and the other end of the steam spraying device 13 penetrates out of the second dynamic sealing component 25; taking the horizontal direction as the reference, the included angle between the axial direction of the pressurized reactor 12 and the horizontal direction is an acute angle. Preferably, the included angle between the axial direction of the pressurized reactor 12 and the horizontal direction is 10°-30°.

[0085] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the mixed inoculation device comprises a premixing reactor 3, the top of the premixing reactor 3 is equipped with a steam spraying and mixing feed port 2, the premixing reactor 3 is internally provided with a stirring and mixing structure 4, and the lower part of the premixing reactor 3 is connected with the pressurized reactor 12 through a material conveying and throwing component 5.

[0086] Specifically, the top of the premixing reactor 3 is equipped with a steam spraying and mixing feed port 2, the horn-shaped steam spraying inlet and the desulfurized gypsum slurry entering the premixing reactor through gravity throwing complete the premixing of the feed, the premixing reactor 3 has a slim and high structure, the height-diameter ratio is between 3:2-1, so as to control the slurry residence time to be slightly higher than the required time of the solid reaction in the slurry. The premixing reactor 3 is internally provided with a stirring and mixing structure 4, which realizes axial and circumferential mixing through down-pressing and frame stirring. The lower part of the premixing reactor 3 is provided with a material conveying and throwing component 5, which makes the material uniformly fall into the pressurized reactor 12 through gravity. The mixed inoculation device is connected with the upper part of the front head of the segmented pressurized reaction device through welding, the gypsum slurry is thrown through gravity, the slurry dispersion is beneficial to mixing. The top of the mixed inoculation device is provided with a temperature and pressure measurement and control device to ensure that the reaction conditions are appropriate and constant.

[0087] On the basis of the above-mentioned embodiments, as a more preferred embodiment, the barrel of the pressurized reactor 12 is rotatable, the axial center of the barrel is equipped with counter-rotating steam spraying devices 13, the barrel is internally provided with material tumbling and throwing transportation devices 14, the desulfurized gypsum material is thrown from the premixing reactor 3 into the pressurized reactor 12 through the front-end assembled material transportation throwing component 5, and the rear end of the pressurized reactor 12 is a fixed discharge port 20.

[0088] It should be noted that the premixing reactor 3 and the pressurized reactor 12 are connected through the material transportation throwing component 5. The material and steam enter the premixing reactor 3 through the steam spraying mixing inlet 2 assembled on the top of the premixing reactor 3 and are preliminarily mixed. The premixing reactor 3 adopts a slim and high structure, the height-diameter ratio is between 3:2-1, and the slurry residence time is slightly higher than the required time for the reaction of solids in the slurry. The upper part of the axial center of the premixing reactor 3 is equipped with a stirrer driving unit 1, the stirring and mixing structure 4 is mixed and stirred in the axial and circumferential directions through the frame stirring blade and the downward pressing stirring blade, the material and steam are fully mixed, and then enter the pressurized reactor 12 through the lower material transportation throwing component 5. The first safety valve 6 is assembled on the top to ensure the safe operation of the premixing reactor 3.

[0089] In one of the embodiments, a first temperature measurement and control unit 9 can be arranged on the upper part of the premixing reactor 3 to monitor the temperature of the premixing reactor 3 in real time, and the steam amount input through the steam spraying mixing inlet 2 is controlled to ensure that the temperature of the premixing reactor 3 is constant.

[0090] In one of the embodiments, a first pressure measurement and control unit 8 and a first exhaust unit 7 can be arranged on the upper part of the premixing reactor 3 to monitor and control the pressure in the premixing reactor 3. If the pressure suddenly changes, relevant pressure control measures can be taken in the first time, which is convenient for adjustment and research.

[0091] The material enters the pressurized reactor 12 uniformly through gravity throwing through the material transportation throwing component 5. The pressurized reactor 12 is horizontally placed, the barrel is rotatable, the center of the outer wall surface of the barrel is welded with a power gear 11, the barrel is driven to rotate through the first driving unit 23, the rear side of the barrel is supported through the rolling support structure 22, the front-end material transportation throwing component 5 and the rear-end fixed discharge port 20 are both fixed and stationary, the relative movement is realized through the dynamic sealing component 10 and the barrel connection, and the fixed support device 21 is used for support. The material is tumbled, thrown, mixed and transported through the internally provided material tumbling and throwing transportation devices 14 in the pressurized reactor 12. For example, the inner wall of the barrel is welded with an inner spiral belt and six evenly distributed baffles, the material is transported from the front segment to the rear end of the barrel through the inner spiral belt, the material is tumbled under the action of gravity and is thrown by the baffles along with the rolling of the barrel.

[0092] The axial center of the barrel of the pressurized reactor 12 is provided with a counter-rotating steam spraying device 13, which is opposite to the rotating direction of the barrel and is driven by a second driving unit 24. The steam pipeline extends to the back end head, is supported by a support bearing part 18 at the back end head, is connected with the front section of the pressurized reactor 12 through a second dynamic sealing part 25 and a steam system pipeline connected with a steam inlet 26, and the steam pipeline steam spraying outlets are arranged in a circumferential 45° angle alternately and gradually change from dense arrangement to sparse arrangement. The steam is uniformly sprayed in the rotating process and fully mixed with the material for reaction. The back end of the pressurized reactor 12 is connected with a fixed discharge port 20 through a first dynamic sealing part 10, and adopts an internal funnel type discharge. A second safety valve 17 is arranged at the top of the fixed discharge port 20 to ensure the safe operation of the pressurized reactor 12.

[0093] In one of the embodiments, a second temperature measurement and control unit 19 can be arranged at the upper part of the fixed discharge port 20 to monitor the temperature of the pressurized reactor 12 in real time, and the steam amount input through the steam inlet 26 is controlled to ensure the constant temperature of the pressurized reactor 12.

[0094] In one of the embodiments, a second pressure measurement and control unit 16 and a second exhaust unit 15 can be arranged at the upper part of the fixed discharge port 20 to monitor and control the pressure in the pressurized reactor 12. If the pressure changes suddenly, relevant pressure control measures can be taken in the first time, which is convenient for adjustment and research.

[0095] In summary, in view of the problems of unstable product performance, low product quality, low product added value, low efficiency, high energy consumption and high cost in the preparation of α-hemihydrate gypsum from desulfurization gypsum, the embodiment of the present application proposes a desulfurization gypsum upgrading hydrothermal synthesis sectional reactor, which can realize efficient mixing reaction of the material, realize full mixing and contact reaction of steam and desulfurization gypsum material through various different stirring forms, ensure the uniformity and stability of the product, improve the reaction efficiency, and can be used for efficient, high product quality, low energy consumption and low cost desulfurization gypsum upgrading technology research and process development.

[0096] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydrothermal synthesis staged reactor for upgrading desulfurized gypsum, characterized in that: It includes a mixing inoculation device and a segmented pressurized reaction device which are connected and assembled in sequence; The mixing inoculation device comprises: A premixing reactor (3) having a steam spray mixing inlet (2) configured to preheat and mix steam with reaction raw materials; A rapid stirring and mixing device (4) is arranged in the premixing reactor (3) and is used to uniformly mix the gypsum slurry and steam; A material transport and scattering component (5) is arranged at the tail end of the premixing reactor (3) and is used for transporting the gypsum slurry in a uniformly mixed state between the premixing reactor (3) and the pressurized reactor (12); The segmented pressurized reaction device comprises: The pressurized reactor (12) has a rotatable cylinder; a main reaction zone and a residual reaction zone are arranged in the cylinder; A material tumbling, throwing and transporting device (14) is fixed to the inner wall of the cylinder and is used for tumbling, throwing, mixing and transporting the gypsum slurry; A steam spraying device (13) is rotatably arranged in the axial direction of the pressurized reactor (12); the steam spraying device (13) includes a plurality of pipeline steam nozzles arranged along the direction of travel of the gypsum slurry, and the number of the pipeline steam nozzles in the main reaction zone is greater than the number of the pipeline steam nozzles in the residual reaction zone; the arrangement density of the pipeline steam nozzles in the main reaction zone is greater than the arrangement density of the pipeline steam nozzles in the residual reaction zone.

2. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 1, characterized in that: The height-to-diameter ratio of the premixing reactor (3) is 3:2-1.

3. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 1, characterized in that: The rotation direction of the steam spraying device (13) is opposite to the rotation direction of the cylinder.

4. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 1, characterized in that: The material tumbling and throwing transport device (14) comprises: There are multiple baffles, and the multiple baffles are respectively arranged on the inner wall of the cylinder along the circumferential direction; There are multiple inner spiral belts, which are arranged on both side walls of the corresponding baffle along the direction of travel of the gypsum slurry and are configured to transport the gypsum slurry in the cylinder along the direction of travel of the gypsum slurry.

5. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 4, characterized in that: The plurality of inner spiral belts are arranged at equal intervals on the side wall of the corresponding baffle; the arrangement direction of each inner spiral belt forms an acute angle with the traveling direction of the gypsum slurry.

6. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 1, characterized in that: The steam spraying device (13) comprises a steam pipe, one end of which is rotatably connected to one end of the pressurized reactor (12); the other end of the steam pipe is dynamically sealedly connected to the other end of the pressurized reactor (12) and extends out of the pressurized reactor (12); The plurality of pipeline steam nozzles are alternately arranged on the steam pipeline in a circumferential arrangement and are in communication with the steam pipeline; Along the traveling direction of the gypsum slurry, the arrangement density of the pipeline steam nozzles gradually decreases.

7. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 1, characterized in that: Also included is a driving device, the driving device comprising: A first driving unit (23) is arranged on one side of the cylinder, and the first driving unit (23) is capable of driving the cylinder to rotate; The second driving unit (24) is arranged on one side of the portion of the steam spraying device (13) extending out of the pressurized reactor (12), and the second driving unit (24) is capable of driving the steam spraying device (13) to rotate.

8. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 1, characterized in that: The pressurized reactor (12) comprises a feed end cover and a discharge end cover, wherein the feed end cover and the discharge end cover are respectively arranged at both ends of the cylinder and are dynamically sealed with the cylinder; The feed end cover is provided with a feed port, and the discharge end cover is provided with a fixed discharge port (20); the mixing and inoculating device is provided with a material transport and scattering component (5), and the material transport and scattering component (5) is fixedly connected to the feed port.

9. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 8, characterized in that: The feed end cover is provided with a second dynamic sealing component (25), and the discharge end cover is provided with a support bearing component (18); one end of the steam spraying device (13) is mounted on the support bearing component (18), and the other end of the steam spraying device (13) passes through the second dynamic sealing component (25); Taking the horizontal direction as a reference, the angle between the axial direction of the pressurized reactor (12) and the horizontal direction is an acute angle.

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