Desulfurized gypsum upgrading hydro-thermal synthesis sectional type reactor

Abstract

The invention relates to the technical field of flue gas desulfurization gypsum upgrading, in particular to a flue gas desulfurization gypsum upgrading hydro-thermal synthesis sectional type reactor which comprises a mixed inoculation device and a sectional type pressurization reaction device which are sequentially connected and assembled. The mixed inoculation device comprises a premixing reactor with a steam spraying and mixing port and a rapid stirring and mixing device. The sectional type pressurized reaction device comprises a pressurized reactor, a material rolling, throwing and transporting device and a steam spraying device. The pressurized reactor is provided with a rotatable barrel, and a main reaction area and a residual reaction area are arranged in the barrel; and the arrangement density of the pipeline steam nozzles of the main reaction area is greater than that of the pipeline steam nozzles of the residual reaction area. On the basis of reducing the energy consumption, the full mixing reaction of the gypsum slurry in the pressurized reactor is realized, and the problems of large product quality fluctuation, relatively low strength, large energy consumption and low reaction efficiency in the process of preparing the alpha-semi-hydrated gypsum by upgrading through a traditional autoclaving method and a high-pressure aqueous solution method are solved.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurized gypsum upgrading, and in particular to a desulfurized gypsum upgrading hydrothermal synthesis segmented reactor. Background Art

[0002] Desulfurized gypsum is a solid waste generated during the desulfurization process of coal-fired power plants. Its main component is calcium sulfate dihydrate, which is similar to natural gypsum. The output of desulfurized gypsum has increased significantly with the rapid development of industry. The traditional landfill treatment method has led 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 desulfurized gypsum can reduce the discharge and accumulation of solid waste, reduce the mining and consumption of natural gypsum resources, and save natural resources while creating economic value.

[0003] Compared with natural gypsum, desulfurized gypsum contains more impurities, which limits its direct use in many material fields. Therefore, desulfurized gypsum needs to be upgraded to better utilize it as a resource. The most promising and profitable way to utilize desulfurized gypsum as a resource is to upgrade desulfurized gypsum to prepare high-strength, high-performance, and high-value-added α-hemihydrate gypsum, with the chemical formula of α-CaSO4·0.5H2O. α-Hemihydrate gypsum can be obtained through the dissolution and crystallization mechanism of dihydrate gypsum. The specific method is to remove 1.5 molecules of crystal water from the lattice of dihydrate gypsum in a saturated water vapor medium or aqueous solution through appropriate heat treatment conditions, forming crystals of hemihydrate gypsum dissolved in an environment surrounded by liquid water. When the concentration of liquid hemihydrate gypsum reaches saturation, the liquid hemihydrate gypsum rapidly crystallizes to form coarse and dense α-hemihydrate gypsum crystals.

[0004] The mainstream process methods for upgrading desulfurized gypsum to prepare α-hemihydrate gypsum are autoclave and high-pressure aqueous solution. The autoclave method is to grind the desulfurized gypsum into powder and place it in an autoclave. After passing high-pressure saturated steam and maintaining a certain temperature and pressure, the crystallization reaction will take place for a period of time to transform it into α-hemihydrate gypsum. The high-pressure aqueous solution method is to mix the desulfurized gypsum, water and crystal control agent into a slurry and put it into an autoclave. Stir and heat it to 120-160°C. After reacting for a period of time under a pressure of 0.2-0.8MPa, dehydration and crystal transformation are completed to obtain α-hemihydrate gypsum. However, in the process of upgrading the desulfurized gypsum by autoclaving and high-pressure aqueous solution, the reaction process of dissolving and crystallizing dihydrate gypsum to obtain α-hemihydrate gypsum is highly sensitive to reaction conditions such as temperature and time. The local α-hemihydrate gypsum growth uniformity and crystallinity fluctuate with changes in reaction temperature and reaction time. At the same time, the desulfurized gypsum slurry raw material is thick and prone to sedimentation and agglomeration, which affects heat transfer and local reaction time and heating state. Therefore, the reaction process and product performance are difficult to control, the product quality fluctuates greatly, the strength is relatively low, and the energy consumption is high, resulting in low product added value, which is not conducive to commercial promotion.

[0005] In addition, the traditional equipment for upgrading desulfurized gypsum to prepare α-hemihydrate gypsum using the autoclave method and the high-pressure aqueous solution method has high energy consumption, long preparation time, low reaction efficiency, and low economic efficiency of the reaction system, which is not conducive to large-scale continuous production. Summary of the invention

[0006] In order to solve the problems of large fluctuation in product quality, relatively low strength, high energy consumption and low reaction efficiency in the traditional autoclave and high-pressure aqueous solution methods for preparing α-hemihydrate gypsum, the object of the present invention is to provide a hydrothermal synthesis staged reactor for upgrading desulfurized gypsum.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows.

[0008] The present invention provides a desulfurized gypsum upgrading hydrothermal synthesis segmented reactor, comprising a mixing and inoculating device and a segmented pressurized reaction device which are sequentially connected and assembled; the mixing and inoculating device comprises a premixing reactor, a rapid stirring and mixing device and a material transport and sprinkling component; the premixing reactor has a steam spraying and mixing inlet, which is configured to preheat and mix steam with the reaction raw materials. The rapid stirring and mixing device is configured in the premixing reactor, and is used to uniformly mix the gypsum slurry and steam; the material transport and sprinkling component is configured at the tail of the premixing reactor, and is used to transport the gypsum slurry between the premixing reactor and the pressurized reactor in a uniformly mixed state;

[0009] The segmented pressurized reaction device includes a pressurized reactor, a material tumbling and throwing transportation device, and a steam spraying device. The pressurized reactor has a rotatable cylinder; the cylinder is provided with a main reaction zone and a residual reaction zone; the material tumbling and throwing transportation device is fixed to the inner wall of the cylinder and is used for tumbling, throwing, mixing and transporting the gypsum slurry; the steam spraying device is rotatably arranged in the axial direction of the pressurized reactor; the steam spraying device includes a plurality of pipeline steam nozzles arranged along the traveling direction of the gypsum slurry, and 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.

[0010] The desulfurized gypsum upgrading hydrothermal synthesis segmented reactor of the present invention is mainly divided into a first segment and a second segment; the first segment is a mixing inoculation device, and the second segment is a segmented pressurized reaction device.

[0011] The mixing and inoculation device mainly focuses on preheating and mixing before the reaction. By fully mixing before the reaction, it is ensured that the mixture is fully mixed before the reaction, thereby controlling the uniformity of the reaction temperature and reaction time during the reaction. In addition, by premixing the reaction raw materials and steam in advance through the mixing and inoculation 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, ensuring sufficient reaction time during the continuous feeding process. Through the cooperation of the pressurized reactor, the material tumbling and throwing transportation device and the steam spraying device, it is ensured that the steam and the slurry are fully mixed during the reaction process, and the gypsum slurry is kept in a mixed state without sedimentation and agglomeration. Since the reaction absorbs heat, the local temperature will be reduced during the reaction process, and maintaining sufficient mixing can ensure uniform heating.

[0013] The present invention can effectively control the reaction temperature and reaction time by cooperating with a mixing inoculation device and a staged pressurized reaction device, realize a sufficient mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoid agglomeration of the gypsum slurry and uneven mixing, which lead to insufficient reaction and affect the quality of the product, and solve the problems of large fluctuation in product quality, relatively low strength, large energy consumption and low reaction efficiency in the process of preparing α-hemihydrate gypsum by the traditional autoclaving method and high-pressure aqueous solution method.

[0014] The segmented pressurized reaction device of the present invention can match the reaction rate of the gypsum slurry in the pressurized reactor mainly by adjusting the arrangement density of the pipeline steam nozzles in the main reaction zone and the residual reaction zone. Among them, 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, thereby forming dense steam injection in the main reaction zone to break up the agglomerated slurry so that it can fully contact the steam for reaction; while in the residual reaction zone, since most of the reactions have been completed, only a small amount of steam is needed to meet the reaction requirements, and the sparse steam spraying port arrangement in the residual reaction zone can improve the steam utilization rate.

[0015] The present invention can help to tumble, sprinkle and mix the gypsum slurry in the cylinder through the material tumbling, sprinkling and transportation device, and cooperate with intensive steam injection to further break up the clumped slurry and allow the slurry to react with the fully contacted steam. At the same time, during the tumbling, sprinkling and mixing process, the gypsum slurry can be transported along the moving direction of the gypsum slurry with the help of the guiding effect of the inner screw belt.

[0016] The present invention performs zoned tumbling, sprinkling, mixing and heat treatment on the gypsum slurry in the cylinder, thereby achieving sufficient mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoiding agglomeration of the gypsum slurry and uneven mixing, resulting in incomplete reaction and affecting product quality.

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

[0018] The present invention adopts a premixing reactor with a tall and thin structure, with a height-to-diameter ratio between 3:2 and 1. The narrow and long space can ensure that steam and gypsum slurry can quickly contact in a very short time.

[0019] Preferably, the rapid stirring and mixing device achieves axial and circumferential mixing through a high-speed downward pressure and frame-type stirring and mixing structure, ensuring rapid mixing in a relatively short time of about 3 minutes to 10 minutes, and fully preheating before the reaction to ensure that the slurry is evenly heated during the reaction.

[0020] Preferably, the rotation direction of the steam spray device is opposite to the rotation direction of the cylinder.

[0021] In the present invention, an accumulation groove for gypsum slurry is formed between the material tumbling and throwing transportation device and the inner wall of the cylinder; since the rotation direction of the steam spraying device is opposite to the rotation direction of the cylinder, 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 up the clumped slurry and make the slurry react with the fully contacted steam.

[0022] Preferably, the material tumbling and scattering transport device comprises:

[0023] There are multiple baffles, which are arranged circumferentially on the inner wall of the cylinder; there are multiple inner spiral belts, which are arranged on both side walls of the corresponding baffles along the traveling direction of the gypsum slurry, and are configured to transport the gypsum slurry in the cylinder along the traveling direction of the gypsum slurry.

[0024] In the present invention, the accumulation groove of the gypsum slurry is formed between the baffle and the inner wall of the cylinder, which is helpful for rolling, throwing and mixing the gypsum slurry in the cylinder; combined with the injected steam, the slurry that has been aggregated is further broken up, and the slurry reacts with the fully contacted steam. The arrangement of the inner spiral belt is mainly to enable the gypsum slurry to be transported along the direction of the gypsum slurry during the rolling, throwing and mixing process with the help of the guiding effect of the inner spiral belt.

[0025] Preferably, a plurality of the inner spiral belts are arranged at equal intervals on the side wall of the corresponding baffle; the arrangement direction of each inner spiral belt is at an acute angle to the direction of travel of the gypsum slurry. Preferably, the arrangement direction of each inner spiral belt is at an angle of 30° to 60° to the direction of travel of the gypsum slurry.

[0026] In the present invention, the arrangement direction of each inner spiral belt is arranged according to the rotation direction of the cylinder and the traveling direction of the gypsum slurry, so that the gypsum slurry in the cylinder can be fully contacted with steam while being transported along the traveling direction of the gypsum slurry, and the steam is used to break up the clumped slurry and react.

[0027] Preferably, the arrangement density of the pipeline steam nozzles in the main reaction zone is 300 mm / piece to 600 mm / piece; the arrangement density of the pipeline steam nozzles in the residual reaction zone is 1000 mm / piece to 1500 mm / piece.

[0028] In the present invention, along the direction of the gypsum slurry, the cylinder is divided into a main reaction zone and a residual reaction zone in sequence. The main reaction zone is arranged at one end of the cylinder close to the mixing and inoculation device, and the residual reaction zone is arranged at one end of the cylinder away from the mixing and inoculation device.

[0029] The present invention can match the reaction rate of the gypsum slurry in the pressurized reactor by adjusting the arrangement density of the pipeline steam nozzles in the main reaction zone and the residual reaction zone. The arrangement density of the steam spray nozzles in the main reaction zone is 300mm / piece to 600mm / piece, and the arrangement density in the residual reaction zone is 1000mm / piece to 1500mm / piece. Since the reaction rate is fast to slow from the front end to the rear end of the pressurized reactor, the reaction mainly occurs in the main reaction zone. The densely distributed steam spray nozzles can meet the amount required for the reaction. At the same time, the dense steam jets in the main reaction zone can break up the agglomerated slurry so that it can fully contact the steam for reaction. In the residual reaction zone, most of the reactions have been completed, and only a small amount of steam is needed to meet the reaction requirements. The sparse steam spray nozzle arrangement in the residual reaction zone can improve the steam utilization rate.

[0030] Preferably, the steam spray device includes a steam pipe, one end of which is rotatably connected to one end of the pressurized reactor; the other end of the steam pipe is dynamically sealed to the other end of the pressurized reactor and extends out of the pressurized reactor; a plurality of the pipe steam nozzles are alternately arranged on the steam pipe at a circumferential angle of 45° and are connected to the steam pipe.

[0031] Preferably, the arrangement density of the pipeline steam nozzles gradually increases along the traveling direction of the gypsum slurry.

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

[0033] Preferably, it also includes a driving device, and the driving device includes:

[0034] A first driving unit is arranged at one side of the cylinder, and the first driving unit can drive the cylinder to rotate; a second driving unit is arranged at one side of the portion of the steam spray device extending out of the pressurized reactor, and the second driving unit can drive the steam spray device to rotate.

[0035] Preferably, the pressurized reactor comprises a feed end cover and a discharge end cover, which are respectively arranged at the two ends of the cylinder and dynamically sealed with the cylinder; the feed end cover has a feed port, and the discharge end cover has a fixed discharge port; the mixing and inoculation device has a material transport and scattering component, which is fixedly connected to the feed port.

[0036] Preferably, the feed end cover has a second dynamic sealing component, and the discharge end cover has a support bearing component; one end of the steam spray device is installed on the support bearing component, and the other end of the steam spray device passes through the second dynamic sealing component; with the horizontal direction as a reference, the angle between the axial direction of the pressurized reactor and the horizontal direction is an acute angle. Preferably, the angle between the axial direction of the pressurized reactor and the horizontal direction is 10° to 30°.

[0037] Beneficial effects of the present invention:

[0038] 1. The present invention can effectively control the reaction temperature and reaction time by cooperating with the mixing inoculation device and the staged pressurized reaction device, and realize the full mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, so as to avoid the agglomeration of the gypsum slurry and uneven mixing, which lead to insufficient reaction and affect the quality of the product, and solve the problems of large fluctuation in product quality, relatively low strength, high energy consumption and low reaction efficiency in the process of preparing α-hemihydrate gypsum by the traditional autoclave method and high-pressure aqueous solution method.

[0039] 2. The present invention can match the reaction rate of the gypsum slurry in the pressurized reactor mainly by adjusting the arrangement density of the pipeline steam nozzles in the main reaction zone and the residual reaction zone. The arrangement density of the pipeline steam nozzles in the main reaction zone is greater than that of the pipeline steam nozzles in the residual reaction zone, thereby forming dense steam injection in the main reaction zone to break up the agglomerated slurry so that it can fully contact the steam for reaction; while in the residual reaction zone, since most of the reactions have been completed, only a small amount of steam is needed to meet the reaction requirements, and the sparse steam spray nozzle arrangement in the residual reaction zone can improve the steam utilization rate.

[0040] 3. The present invention can help to tumble and mix the gypsum slurry in the cylinder through the material tumbling and sprinkling transportation device, and cooperate with intensive steam injection to further break up the clumped slurry and make the slurry react with the fully contacted steam. At the same time, during the tumbling and sprinkling mixing process, the gypsum slurry can be transported along the moving direction of the gypsum slurry with the help of the guiding effect of the inner spiral belt.

[0041] 4. The hydrothermal synthesis staged reactor for upgrading the desulfurized gypsum of the present invention can help the nucleation and growth of α-hemihydrate gypsum grains, ensure uniform crystal form and stable quality, and help produce products with higher compressive strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural cross-sectional view of a desulfurized gypsum upgrading hydrothermal synthesis staged reactor provided in an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Agitator drive unit; 2. Steam spray mixing inlet; 3. Premixing reactor; 4. Rapid stirring and mixing device; 5. Material transportation and scattering component; 6. First safety valve; 7. First exhaust unit; 8. First pressure measurement and control unit; 9. First temperature measurement and control unit; 10. First dynamic sealing component; 11. Power gear; 12. Pressurized reactor; 13. Steam spray device; 14. Material tumbling and scattering transportation 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 solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0047] The technical solution of the present invention is further described below by means of specific examples. In the following examples, the methods described are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0048] like Figure 1 A desulfurized gypsum upgrading hydrothermal synthesis segmented reactor comprises a mixing inoculation device and a segmented pressurized reaction device which are sequentially connected and assembled.

[0049] The mixing and inoculating device comprises: a premixing reactor 3, a rapid stirring and mixing device 4 and a material transport and throwing component 5. The premixing reactor 3 has a steam spraying and mixing inlet 2, which is configured to preheat and mix steam with the reaction raw materials; the rapid stirring and mixing device 4 is configured in the premixing reactor 3, and is used to uniformly mix the gypsum slurry and steam in a short time; the material transport and throwing component 5 is configured at the tail of the premixing reactor 3, and is used to transport the gypsum slurry between the premixing reactor 3 and the pressurized reactor 12 in a uniformly mixed state.

[0050] The segmented pressurized reaction device includes a pressurized reactor 12, a steam spraying device 13 and a material tumbling and sprinkling transport device 14. The pressurized reactor 12 has a rotatable cylinder; a main reaction zone and a residual reaction zone are arranged in the cylinder. The material tumbling and sprinkling transport device 14 is fixed to the inner wall of the cylinder, and is used to tumble, sprinkle, mix and transport the gypsum slurry. The 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 traveling direction of the gypsum slurry, and the number of pipeline steam nozzles in the main reaction zone is greater than the number of pipeline steam nozzles in the residual reaction zone.

[0051] Specifically, the desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to the embodiment of the present invention is mainly divided into a first stage and a second stage; the first stage is a mixing inoculation device, and the second stage is a staged pressurized reaction device.

[0052] The mixing and inoculation device mainly focuses on preheating and mixing before the reaction. By fully mixing before the reaction, it is ensured that the mixture is fully mixed before the reaction, thereby controlling the uniformity of the reaction temperature and reaction time during the reaction. In addition, by premixing the reaction raw materials and steam in advance through the mixing and inoculation device, the total reaction time can be reduced, the reaction efficiency can be improved, and the purpose of reducing energy consumption can be achieved.

[0053] The segmented pressurized reaction device mainly focuses on the reaction. The reaction has a large space, ensuring sufficient reaction time during the continuous feeding process. Through the cooperation of the pressurized reactor, the material tumbling and throwing transportation device and the steam spraying device, it is ensured that the steam and the slurry are fully mixed during the reaction process, and the gypsum slurry is kept in a mixed state without sedimentation and agglomeration. Since the reaction absorbs heat, the local temperature will be reduced during the reaction process, and maintaining sufficient mixing can ensure uniform heating.

[0054] Specifically, the embodiment of the present invention can effectively control the reaction temperature and reaction time through the cooperation of the mixing inoculation device and the staged pressurized reaction device, and achieve sufficient mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, thereby avoiding agglomeration of the gypsum slurry and uneven mixing, which lead to insufficient reaction and affect the quality of the product, and solve the problems of large fluctuations in product quality, relatively low strength, high energy consumption and low reaction efficiency in the traditional autoclave method and high-pressure aqueous solution method for preparing α-hemihydrate gypsum.

[0055] Specifically, the segmented pressurized reaction device of the embodiment of the present invention can match the reaction rate of the gypsum slurry in the pressurized reactor mainly by adjusting the arrangement density of the pipeline steam nozzles in the main reaction zone and the residual reaction zone. Among them, 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, thereby forming dense steam injection in the main reaction zone to break up the agglomerated slurry so that it can fully contact the steam for reaction; while in the residual reaction zone, since most of the reactions have been completed, only a small amount of steam is needed to meet the reaction requirements, and the sparse steam spray port arrangement in the residual reaction zone can improve the steam utilization rate.

[0056] Specifically, the embodiment of the present invention can help to tumble and mix the gypsum slurry in the cylinder through the material tumbling and sprinkling transportation device, and cooperate with intensive steam injection to further break up the clumped slurry and allow the slurry to react with the fully contacted steam. At the same time, during the tumbling and sprinkling mixing process, the gypsum slurry can be transported along the moving direction of the gypsum slurry with the help of the guiding effect of the inner screw belt.

[0057] Specifically, the embodiment of the present invention performs zoned tumbling, sprinkling, mixing and heat treatment on the gypsum slurry in the cylinder, thereby achieving sufficient mixing reaction of the gypsum slurry in the pressurized reactor on the basis of reducing energy consumption, avoiding agglomeration of the gypsum slurry and uneven mixing, which would lead to insufficient reaction and affect product quality.

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

[0059] Specifically, the embodiment of the present invention adopts a premixing reactor with a tall and thin structure, with a height-to-diameter ratio of 3:2 to 1. The narrow and long space can ensure that the steam and the gypsum slurry are in rapid contact in a very short time.

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

[0061] Specifically, the rapid stirring and mixing device 4 of the embodiment of the present invention adopts a high-speed stirring and mixing structure, and performs axial and circumferential mixing through downward pressure and frame stirring, ensuring rapid mixing in a short time of about 3 minutes to 10 minutes, and fully preheating before the reaction to ensure that the slurry is heated evenly during the reaction.

[0062] On the basis of the above embodiment, as a more preferred embodiment, the rotation direction of the steam spray device 13 is opposite to the rotation direction of the cylinder.

[0063] Specifically, an accumulation groove for the gypsum slurry is formed between the material tumbling and spreading transportation device and the inner wall of the cylinder; since the rotation direction of the steam spray device is opposite to that of the cylinder, the multiple pipeline steam nozzles of the steam spray device can fully contact the gypsum slurry in the accumulation groove, and the sprayed steam can break up the clumped 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 scattering transport device 14 includes a baffle and an inner spiral belt.

[0065] There are multiple baffles, which are respectively arranged on the inner wall of the cylinder along the circumferential direction.

[0066] There are multiple inner spiral belts, which are arranged on the two side walls of the baffle corresponding to them along the traveling direction of the gypsum slurry, and are configured to transport the gypsum slurry in the cylinder along the traveling direction of the gypsum slurry.

[0067] Specifically, the accumulation groove of the gypsum slurry is formed between the baffle and the inner wall of the cylinder, which helps to roll, sprinkle and mix the gypsum slurry in the cylinder; combined with the injected steam, the slurry that has gathered into a mass is further broken up, and the slurry reacts with the fully contacted steam. The setting of the inner spiral belt is mainly to enable the gypsum slurry to be transported along the direction of the gypsum slurry during the rolling, sprinkling and mixing process with the help of the guiding effect of the inner spiral belt.

[0068] Specifically, the embodiments of the present invention mainly utilize a mixing and inoculating device to fully stir and mix, utilize the inner spiral belt of a segmented pressurized reaction device to roll and stir, sprinkle and tumble the desulfurized gypsum slurry through six baffles, and ensure uniform steam spraying through a steam spray device rotating at the center of the cylinder, fully mix the steam and the desulfurized gypsum slurry, and allow the steam to fully contact the desulfurized gypsum slurry to help the nucleation and growth of α-hemihydrate gypsum grains.

[0069] The desulfurized gypsum upgrading hydrothermal synthesis segmented reactor provided in the embodiment of the present invention can realize the full conversion reaction, and ensure the full contact and reaction between steam and slurry gypsum by combining graded premixing with multiple stirring methods, thereby providing a practical hydrothermal synthesis α-hemihydrate gypsum preparation equipment for desulfurized gypsum upgrading, recycling and resource utilization.

[0070] Based on the above embodiment, as a more preferred embodiment, a 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 is at an acute angle to the direction of travel of the gypsum slurry. Preferably, the arrangement direction of each inner spiral belt is at an angle of 30° to 60° to the direction of travel of the gypsum slurry.

[0071] Specifically, the arrangement direction of each inner spiral belt is arranged according to the rotation direction of the cylinder and the traveling direction of the gypsum slurry, so that the gypsum slurry in the cylinder can be fully contacted with steam while being transported along the traveling direction of the gypsum slurry, and the steam can be used to break up the clumped slurry and react.

[0072] On the basis of the above embodiment, as a more preferred embodiment, the arrangement density of the pipe steam nozzles in the main reaction zone is 300 mm / piece to 600 mm / piece; the arrangement density of the pipe steam nozzles in the residual reaction zone is 1000 mm / piece to 1500 mm / piece.

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

[0074] Specifically, the embodiment of the present invention can match the reaction rate of the gypsum slurry in the pressurized reactor by adjusting the arrangement density of the pipeline steam nozzles in the main reaction zone and the residual reaction zone. The arrangement density of the steam spray nozzles in the main reaction zone is 300mm / piece to 600mm / piece, and the arrangement density in the residual reaction zone is 1000mm / piece to 1500mm / piece. Since the reaction rate is fast to slow from the front end to the rear end of the pressurized reactor, the reaction mainly occurs in the main reaction zone. The densely distributed steam spray nozzles can meet the amount required for the reaction. At the same time, the dense steam jets in the main reaction zone can break up the agglomerated slurry so that it can fully contact the steam for reaction. In the residual reaction zone, most of the reactions have been completed, and only a small amount of steam is needed to meet the reaction requirements. The sparse steam spray nozzle arrangement in the residual reaction zone can improve the steam utilization rate.

[0075] On the basis of the above embodiment, as a more preferred embodiment, the steam spray device 13 includes 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 sealed to the other end of the pressurized reactor 12 and extends out of the pressurized reactor 12; a plurality of pipe steam nozzles are alternately arranged on the steam pipe at a circumferential angle of 45° and are connected to the steam pipe.

[0076] Specifically, one end of the steam pipe extending out of the pressurized reactor 12 is configured as a steam inlet 26, which is connected to an external steam system. A steam spray device 13 is arranged at the axial center of the cylinder of the pressurized reactor 12, which is opposite to the rotation direction of the cylinder and is driven by a second drive unit 24. The steam pipe is located at the pipe extending to the rear end end cap, and is supported by a support bearing component 18 at the rear end end cap. The steam pipe is connected to the pipe of the external steam system of the steam inlet 26 and the front section of the pressurized reactor 12 through a second dynamic sealing component 25.

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

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

[0079] On the basis of the above embodiment, as a more preferred embodiment, a driving device is further included, and the driving device includes: a first driving unit 23 and a second driving unit 24 .

[0080] The first driving unit 23 is arranged on one side of the cylinder, and the first driving unit 23 can drive the cylinder to rotate. Specifically, the first driving unit 23 is a first driving unit, such as a motor. Specifically, the pressurized reactor 12 is placed horizontally, the cylinder can rotate, the power gear 11 is assembled at the center of the outer wall of the cylinder, and the first driving unit 23 has a driving gear, which is meshed with the power gear 11, thereby, the driving gear is rotated by the first driving unit 23, thereby driving the power gear 11 to rotate.

[0081] The second driving unit 24 is disposed 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 can drive the steam spraying device 13 to rotate.

[0082] On the basis of the above embodiment, as a more preferred embodiment, the pressurized reactor 12 includes a feed end cover and a discharge end cover, which are respectively arranged at the two ends of the cylinder and dynamically sealed with the cylinder; the feed end cover has a feed port, and the discharge end cover has a fixed discharge port 20; the mixing and inoculation device has a material transport and scattering component 5, which is fixedly connected to the feed port.

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

[0084] On the basis of the above 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 spray device 13 is mounted on the support bearing component 18, and the other end of the steam spray device 13 passes through the second dynamic sealing component 25; with the horizontal direction as a reference, the angle between the axial direction of the pressure reactor 12 and the horizontal direction is an acute angle. Preferably, the angle between the axial direction of the pressure reactor 12 and the horizontal direction is 10° to 30°.

[0085] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the mixing and inoculating device includes a premixing reactor 3, the top of the premixing reactor 3 is equipped with a steam spray mixing inlet 2, the premixing reactor 3 has a built-in stirring and mixing structure 4, and the lower part of the premixing reactor 3 is connected to the pressurized reactor 12 through a material transport and spreading component 5.

[0086] Specifically, the top of the premixing reactor 3 is equipped with a steam spraying inlet 2, and the feed premixing is completed through the trumpet-shaped steam spraying inlet and the desulfurized gypsum slurry thrown into the premixing reactor by gravity. The premixing reactor 3 is a tall and thin structure with a height-to-diameter ratio between 3:2 and 1, so that the slurry residence time can be controlled to be slightly higher than the time required for the solid reaction in the slurry. The premixing reactor 3 has a built-in stirring and mixing structure 4, which performs axial and circumferential mixing through downward pressure and frame stirring. The underground part of the premixing reactor 3 is equipped with a material transportation and sprinkling component 5, which uses gravity to make the material fall evenly into the pressurized reactor 12. The mixing and inoculating device is connected to the upper part of the front end of the segmented pressurized reaction device by welding, and the gypsum slurry is sprinkled by gravity, so that the slurry is dispersed and easy to mix. The top of the mixing and inoculating device is equipped with a temperature and pressure measurement and control device to ensure that the reaction conditions are suitable and constant.

[0087] On the basis of the above embodiment, as a more preferred embodiment, the cylinder of the pressurized reactor 12 is rotatable, and the axial center of the cylinder is equipped with a counter-rotating steam spray device 13. The cylinder has a built-in material tumbling and sprinkling transport device 14. The desulfurized gypsum material is sprinkled from the premixing reactor 3 into the pressurized reactor 12 through the material transport and sprinkling component 5 installed at the front end. 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 by a material transport and sprinkling component 5. The material and steam enter the premixing reactor 3 through the steam spraying and mixing inlet 2 installed on the top of the premixing reactor 3 and are preliminarily mixed. The premixing reactor 3 adopts a thin and tall structure with a height-to-diameter ratio between 3:2 and 1, and the slurry residence time is controlled to be slightly higher than the time required for the solid reaction in the slurry. The agitator drive unit 1 is installed on the upper axial center of the premixing reactor 3, and the stirring and mixing structure 4 performs axial and circumferential mixing and stirring through a frame-type stirring blade and a downward pressure stirring blade. After the material and steam are fully mixed, they enter the pressurized reactor 12 through the lower material transport and sprinkling component 5. The first safety valve 6 is installed at the top to ensure the safe operation of the premixing reactor 3.

[0089] In one embodiment, a first temperature measurement and control unit 9 may be provided on the upper portion of the premixing reactor 3 to monitor the temperature of the premixing reactor 3 in real time, and the temperature of the premixing reactor 3 may be kept constant by controlling the amount of steam input through the steam injection mixing inlet 2.

[0090] In one of the embodiments, a first pressure measurement and control unit 8 and a first exhaust unit 7 may be provided on the upper portion of the premixing reactor 3 to monitor and control the pressure conditions within the premixing reactor 3. If the pressure suddenly changes, relevant pressure control measures may be taken immediately to facilitate adjustment and research.

[0091] The material is evenly thrown into the pressurized reactor 12 by gravity through the material transport and scattering component 5. The pressurized reactor 12 is placed horizontally, and its cylinder rotates. The power gear 11 is welded at the center of the outer wall of the cylinder, and is driven to rotate by the first drive unit 23. The rear side of the cylinder is supported by a rolling support structure 22. The front material transport and scattering component 5 and the rear fixed discharge port 20 are both fixed and stationary, connected to the cylinder through a dynamic sealing component 10 to achieve relative movement, and supported by a fixed support device 21. The material is tumbled, scattered, mixed and transported by the material tumbling and scattering transportation device 14 built into the pressurized reactor 12. For example, an inner spiral belt and six evenly distributed baffles are welded on the inner wall of the cylinder. The material is transported from the front end of the cylinder to the rear end through the inner spiral belt. As the cylinder rolls, the material is turned over by gravity and is scattered by the baffle.

[0092] The axial center of the cylinder of the pressurized reactor 12 is equipped with a counter-rotating steam spray device 13, and the steam spray device 13 rotates in the opposite direction to the cylinder, and is driven by the second drive unit 24. The steam pipe is located in the pipeline extending to the rear end head, and is supported by the support bearing component 18 at the rear end head. The steam system pipeline connected to the steam inlet 26 and the front section of the pressurized reactor 12 are connected through the second dynamic sealing component 25. The arrangement of the pipeline steam nozzles is alternately arranged at a 45° angle in the circumferential direction, and gradually becomes sparse from dense arrangement. The steam is evenly sprayed during the rotation process and fully mixed and reacted with the material. The rear end of the pressurized reactor 12 is connected to the fixed discharge port 20 through the first dynamic sealing component 10, and a built-in funnel-type discharge is adopted. The second safety valve 17 is assembled on the top of the fixed discharge port 20 to ensure the safe operation of the pressurized reactor 12.

[0093] In one embodiment, a second temperature measurement and control unit 19 may be disposed on the upper portion of the fixed discharge port 20 to monitor the temperature of the pressurized reactor 12 in real time, and the temperature of the pressurized reactor 12 may be kept constant by controlling the amount of steam input through the steam inlet 26 .

[0094] In one embodiment, a second pressure measurement and control unit 16 and a second exhaust unit 15 may be provided on the upper portion of the fixed discharge port 20 to monitor and control the pressure conditions in the pressurized reactor 12. If the pressure suddenly changes, relevant pressure control measures may be taken immediately to facilitate adjustment and research.

[0095] In summary, in order to solve the problems that the existing desulfurized gypsum upgrading to prepare α-hemihydrate gypsum has unstable product performance and low product quality, resulting in low product added value, low efficiency, high energy consumption and high cost, the embodiment of the present invention proposes a desulfurized gypsum upgrading hydrothermal synthesis segmented reactor, which can realize efficient mixing reaction of materials, and realize sufficient mixing and contact reaction of steam and desulfurized gypsum materials through a variety of different stirring forms, thereby ensuring the uniformity and stability of the product and improving the reaction efficiency. It can be used for high-efficiency, high-product quality, low-energy consumption and low-cost desulfurized gypsum upgrading technology research and process development.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

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 sequentially connected and assembled; The mixed inoculation device comprises: A premixing reactor (3) has 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 the steam; A material transport and scattering component (5) is arranged at the rear 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 pressurizing 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 spray device (13) is rotatably arranged in the axial direction of the pressurized reactor (12); the steam spray device (13) comprises 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.

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 scattering transport device (14) comprises: There are a plurality of baffles, and the plurality of 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 baffle corresponding to them along the traveling direction of the gypsum slurry, and are configured to transport the gypsum slurry in the cylinder along the traveling direction of the gypsum slurry.

5. The desulfurized gypsum upgrading hydrothermal synthesis staged reactor according to claim 4, characterized in that: A plurality of the inner spiral belts are arranged at equal intervals on the side wall of the corresponding baffle plate; 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 arrangement density of the pipeline steam nozzles in the main reaction zone is 300 mm / piece to 600 mm / piece; the arrangement density of the pipeline steam nozzles in the residual reaction zone is 1000 mm / piece to 1500 mm / piece.

7. 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); A plurality of the pipeline steam nozzles are alternately arranged on the steam pipeline in a circumferential arrangement manner 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 increases.

8. 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) can drive 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) can drive the steam spraying device (13) to rotate.

9. 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 two ends of the cylinder and are dynamically sealedly connected to 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.

10. 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 supporting bearing component (18); one end of the steam spraying device (13) is mounted on the supporting 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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