A preparation device and method for preparing whisker calcium sulfate from high-salt gas field produced water

Abstract

The application relates to a preparation device and a preparation method of whisker calcium sulfate prepared from high-salt gas field produced water, which comprises a shell, a motor fixed on the shell, a first pipeline fixed on the shell, a second pipeline fixed on the first pipeline, a first rotating shaft fixed on the motor, a concentration mechanism fixed on the shell, a water storage mechanism fixed on the shell and a crystallization mechanism fixed on the shell; the whisker calcium sulfate is prepared from the high-salt gas field produced water, the problem that the acid liquid is diluted and the whisker calcium sulfate is generated slowly is solved by directly adding the calcium sulfate suspension into the acid liquid in the existing production process.

Description

Technical Field

[0001] This invention relates to the field of inorganic material preparation technology, specifically to an apparatus and method for preparing whisker calcium sulfate from produced water from high-salinity gas fields. Background Technology

[0002] Calcium sulfate whiskers, also known as gypsum whiskers, are an inorganic non-metallic material with a relatively complete crystal structure. Based on the crystal phase, they are classified into anhydrous, hemihydrate, and dihydrate calcium sulfate whiskers. They are characterized by their complete structure, good toughness, high strength, and high temperature resistance, and have wide applications in various industries. Calcium sulfate whiskers are inexpensive and of good quality, and are also an environmentally friendly material, thus having a broad market.

[0003] Produced water in natural gas fields refers to the high-salt wastewater that is discharged during the exploration and development of natural gas, due to the presence of groundwater at the bottom of the gas reservoir. This wastewater contains salts, and direct discharge would pollute the environment. In industry, the salts are usually separated and extracted as a byproduct of natural gas extraction, improving economic efficiency and treating harmful substances in the produced water. Calcium sulfate is a common salt in produced water. Industrially, calcium sulfate whiskers are typically prepared using an atmospheric pressure acidification method. At a certain temperature, a high-concentration calcium sulfate suspension can be converted into hydrated calcium sulfate whiskers in an acidic solution. While calcium sulfate has very low solubility in water at room temperature and pressure, current preparation processes often involve directly pouring the calcium sulfate suspension into the acid solution. This method causes a large amount of water to mix with the acid, increasing the pH of the acid solution and weakening its acidity, thus reducing the efficiency of converting calcium sulfate into hydrated calcium sulfate whiskers. Summary of the Invention

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section above, some embodiments of this application provide an apparatus and method for preparing whisker calcium sulfate from produced water from high-salinity gas fields, including a shell, a motor fixedly mounted on the shell, a first pipe fixedly mounted on the shell, a second pipe fixedly mounted on the first pipe, a first rotating shaft fixedly mounted on the motor, a concentration mechanism fixedly mounted on the shell, a water storage mechanism fixedly mounted on the shell, and a crystallization mechanism fixedly mounted on the shell. The purification mechanism includes a first bracket fixedly mounted on a first pipe and penetrated by a first rotating shaft, a first chute fixedly mounted on the first pipe and the housing, a drive housing rotatably mounted on the first chute, multiple second chutes fixedly mounted on the drive housing, a drive assembly fixedly mounted on the first housing, a stirring assembly rotatably mounted on the second chute, multiple first through holes fixedly mounted on the first pipe, a partition fixedly mounted on the first pipe, multiple first valves fixedly mounted on the partition, and a heater fixedly mounted on the housing.

[0006] Specifically, the drive assembly includes a first gear ring fixedly mounted on a first rotating shaft and a plurality of first gears rotatably mounted on a first pipe and meshing with the first gear ring on one side and with the drive housing on the other side.

[0007] Specifically, the stirring assembly includes multiple third grooves fixed on the housing, a first ring slidably disposed on the second groove, multiple first connecting rods fixed on the first ring, a second ring fixed on the first connecting rod, multiple second through holes fixed on the second ring, a stirring rod rotatably disposed on the first ring and passing through the second ring, multiple stirring blades fixed on the stirring rod, multiple first racks fixed on one side of the third groove, and a second gear fixed on one end of the stirring rod and meshing with the first rack.

[0008] Specifically, the water storage mechanism includes multiple fourth sluices fixed on the first pipe, a water tank slidably mounted on the fourth sluices, multiple first springs with one end fixed on the water tank and the other end fixed on the housing, multiple second valves fixed on the water tank, multiple third pipes fixed on the water tank, an air pump fixed on the housing, a fourth pipe fixed on the air pump and the housing, a fifth pipe fixed on the air pump and the housing, and a closing assembly fixed on the first pipe and the water tank.

[0009] Specifically, the closing assembly includes multiple fifth slide grooves fixed on the first pipe, multiple second racks fixed on the water tank, multiple third racks slidably disposed on the fifth slide grooves, a baffle fixed on the third racks, a third gear rotatably disposed on the first pipe and meshing with the third and second racks, and a second spring fixed at one end on the third rack and at the other end on the fifth slide grooves.

[0010] Specifically, the crystallization mechanism includes a sixth pipe fixed on the housing, a third valve fixed on the housing, multiple third through holes fixed on the first pipe, multiple fourth through holes fixed on the housing, a pressure filter assembly fixed on the housing, and a filter assembly fixed on the first housing.

[0011] Specifically, the filter press assembly includes a second gear ring fixedly mounted on the first pipe and fixedly mounted on the first rotating shaft, a plurality of fourth gears rotatably mounted on the housing and meshing with the second gear ring, a threaded rod fixedly mounted on the fourth gears, a plurality of sixth sliding grooves fixedly mounted on the housing, a pressure plate slidably mounted on the sixth sliding grooves, and a plurality of sleeves fixedly mounted on the pressure plate and sleeved on the threaded rods.

[0012] Specifically, the filter assembly includes multiple electrically operated telescopic rods fixedly mounted on the first housing and filter screens fixedly mounted on the electrically operated telescopic rods.

[0013] A method for preparing whisker calcium sulfate from produced water from high-salinity gas fields includes the following steps: a. The extracted water containing calcium sulfate is introduced into the first pipe through the second pipe, and then enters the purification unit through the first through hole, that is, the low-concentration calcium sulfate suspension enters the purification unit; b. The motor drives the first rotating shaft to rotate, which in turn drives the drive assembly to work. The drive assembly drives the stirring assembly to move up and down and stir the low-concentration calcium sulfate suspension. At the same time, the heater works to heat the low-concentration calcium sulfate suspension, causing water to evaporate and increasing the concentration of calcium sulfate in the extracted water, turning it into a high-concentration calcium sulfate suspension. c. The vacuum pump draws the evaporated steam into the water tank for condensation. As the weight of the condensate gradually increases, the water tank will gradually move downward, causing the closing component to move and close the first through hole. When the water tank slides to the bottom of the fourth chute, the first valve opens, and the high-concentration calcium sulfate suspension enters the crystallization mechanism through the first pipe and the third through hole. d. Acidic liquid is added into the shell through the sixth pipe. The high-concentration calcium sulfate suspension forms calcium sulfate whiskers in the acidic environment. The motor drives the first shaft to rotate, which in turn drives the filter press assembly to work, causing the pressure plate to move downward and crush the calcium sulfate whiskers. The electric telescopic rod pushes the filter screen to close the third through hole, and the second and third valves open. The acidic liquid is discharged through the third valve, and the water in the water tank will wash the calcium sulfate whiskers. After washing, the whiskers are discharged through the third valve. The electric telescopic rod controls the filter screen to open the third through hole, and the crushed calcium sulfate whiskers are discharged through the third valve.

[0014] The beneficial effects of this invention are: (1) By setting up a concentration mechanism, the calcium sulfate suspension is concentrated before being added to the acidic solution, thereby increasing the concentration of the calcium sulfate suspension and preventing the water in it from diluting the acidic solution and thus slowing down the whisker formation rate, thereby improving production efficiency.

[0015] (2) Calcium sulfate whiskers need to be washed, filtered and dried before they can be packaged. However, in the existing preparation process, multiple devices are usually used to crystallize, filter and wash separately. This device completes crystallization, filtration and washing with one device by setting up a concentration mechanism, a filter pressing component and a water storage component. It has high production efficiency and a compact structure.

[0016] (3) A closing component is provided. When the condensate gradually increases, the water tank moves downward, the second rack meshes with the third gear and drives the third gear to rotate. The third gear drives the third rack to move upward, and the third rack drives the baffle to move upward to close the first through hole. Closing the first through hole is to avoid excessive evaporation of water in the calcium sulfate suspension. When the calcium sulfate suspension enters the concentration mechanism, a part of it will be on the first pipe and the baffle. There is no heater in this area. Therefore, closing the first through hole can prevent excessive evaporation of the calcium sulfate suspension, retain some water, and make the high-concentration calcium sulfate suspension still have fluidity.

[0017] (4) It is equipped with a water storage mechanism to collect the condensate during the evaporation and concentration process and use it for rinsing the whiskers. No additional water is needed for rinsing, thus realizing the reuse of condensate and saving resources. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0019] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 Isometric profile of the AA (Chinese Academy of Sciences); Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 for Figure 3 A magnified view of a section at point C; Figure 6 for Figure 3 A magnified view of a section at point D; Figure 7 for Figure 2 A line section of the EE; Figure 8 for Figure 7 A magnified view of a section at point G in the middle; Figure 9 for Figure 7 A magnified view of a section at point H in the middle; Figure 10 for Figure 7 A magnified view of a section at point I; Figure 11 for Figure 7 A magnified view of a section at point J. Detailed Implementation

[0021] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0022] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0023] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0024] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0025] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Reference Figures 1-11As shown, the present invention discloses an apparatus and method for preparing calcium sulfate whiskers from produced water from high-salinity gas fields, comprising a shell 1, a motor 2 fixedly mounted on the shell, a first pipe 3 fixedly mounted on the shell, a second pipe 4 fixedly mounted on the first pipe, a first rotating shaft 5 fixedly mounted on the motor, a concentration mechanism 6 fixedly mounted on the shell, a water storage mechanism 7 fixedly mounted on the shell, and a crystallization mechanism 8 fixedly mounted on the shell; the second pipe is connected to the first pipe; the first rotating shaft is connected to the motor, and the motor drives the first rotating shaft to rotate; the concentration mechanism is used to increase the concentration of the calcium sulfate suspension; the water storage mechanism is used to store condensate; and the crystallization mechanism converts calcium sulfate into calcium sulfate whiskers. The purification mechanism includes a first support 61 fixedly mounted on a first pipe and penetrated by a first rotating shaft, a first slide 62 fixedly mounted on the first pipe and the housing, a drive housing 63 rotatably mounted on the first slide, multiple second slides 64 fixedly mounted on the drive housing, a drive assembly 65 fixedly mounted on the first housing, a stirring assembly 66 rotatably mounted on the second slides, multiple first through holes 67 fixedly mounted on the first pipe, a partition 68 fixedly mounted on the first pipe, multiple first valves 69 fixedly mounted on the partition, and a heater 60 fixedly mounted on the housing; the bottom of the purification mechanism is provided with an inclined surface to facilitate liquid outflow. The first bracket is used for limiting the first rotating shaft; the part of the drive housing that contacts the drive assembly is toothed; the second slide is a threaded slide; the drive assembly is used to drive the stirring assembly to work, the stirring assembly can slide and rotate on the second slide to stir the calcium sulfate suspension, so that it is heated evenly, accelerates evaporation, and increases the concentration; the heater is used to heat the calcium sulfate suspension; through the purification mechanism, the low-concentration calcium sulfate suspension can be increased in concentration and most of the water can be removed. When acidic liquid is poured in later, the water in the suspension can be avoided to dilute the acidic liquid, thereby avoiding the weakening of acidity and the reduction of calcium sulfate whisker conversion efficiency.

[0027] Specifically, the drive assembly includes a first gear ring 651 fixedly mounted on a first rotating shaft and a plurality of first gears 652 rotatably mounted on a first pipe and meshing with the first gear ring on one side and with the drive housing on the other side; the motor drives the first gear ring to rotate, which in turn drives the first gears to rotate, and the first gears mesh with the drive housing, thereby driving the drive housing to rotate.

[0028] Specifically, the stirring assembly includes multiple third grooves 661 fixed on the housing, a first ring 662 slidably disposed on the second groove, multiple first connecting rods 662 fixed on the first ring, a second ring 663 fixed on the first connecting rod, multiple second through holes 664 fixed on the second ring, a stirring rod 665 rotatably disposed on the first ring and passing through the second ring, multiple stirring blades 666 fixed on the stirring rod, multiple first racks 667 fixed on one side of the third groove, and a first toothed rack 667 fixed on one end of the stirring rod and connected to the first ring. The second gear 668 engages with the rack; the first ring has a protrusion that engages with the second groove; the first ring and the second ring are fixedly connected by the first connecting rod and are limited by the third groove. Therefore, when the drive housing rotates, the first ring and the second ring can slide upward on the third groove, and the second groove will also limit the first ring. When the first ring and the second ring slide upward, they will drive the second gear to roll on the first rack, thereby driving the stirring rod to rotate, and finally driving the stirring blade to rotate. In conjunction with the heater, the calcium sulfate suspension is heated evenly, accelerating evaporation and increasing the concentration.

[0029] Specifically, the water storage mechanism includes multiple fourth sluices 71 fixed on the first pipe, a water tank 72 slidably mounted on the fourth sluices, multiple first springs 73 with one end fixed on the water tank and the other end fixed on the housing, multiple second valves 74 fixed on the water tank, multiple third pipes 75 fixed on the water tank, a vacuum pump 76 fixed on the housing, a fourth pipe 77 fixed on the vacuum pump and the housing, a fifth pipe 78 fixed on the vacuum pump and the housing, and a closing assembly 79 fixed on the first pipe and the water tank. The water tank can slide on the fourth sluices, and the bottom of the water tank is provided with an inclined surface to facilitate liquid outflow. The vacuum pump draws water vapor generated by the concentration mechanism into the water tank for condensation, forming condensate. The more condensate, the more water evaporated from the calcium sulfate suspension, i.e., the higher the concentration.

[0030] Specifically, the closing assembly includes multiple fifth slide grooves 791 fixed on the first pipe, multiple second racks 792 fixed on the water tank, multiple third racks 793 slidably mounted on the fifth slide grooves, a baffle 794 fixed on the third rack, a third gear 795 rotatably mounted on the first pipe and meshing with the third and second racks, and a second spring 796 fixed at one end on the third rack and at the other end on the fifth slide groove. In the initial state, the second rack is a certain distance from the third gear. As the condensate gradually increases, the water tank moves downward, the second rack meshes with the third gear, and drives the third gear to rotate. The third gear drives the third rack to move upward, and the third rack drives the baffle to move upward to close the first through hole. Closing the first through hole is to prevent excessive evaporation of water in the calcium sulfate suspension. When the calcium sulfate suspension enters the concentration mechanism, a portion of it will be on the first pipe and the baffle. This area does not have a heater, so closing the first through hole can prevent excessive evaporation of the calcium sulfate suspension and retain some water.

[0031] Specifically, the crystallization mechanism includes a sixth pipe 81 fixed on the housing, a third valve 82 fixed on the housing, multiple third through holes 84 fixed on the first pipe, multiple fourth through holes 85 fixed on the housing, a pressure filter assembly 86 fixed on the housing, and a filter assembly 87 fixed on the first housing. The bottom of the crystallization mechanism is provided with an inclined surface to facilitate liquid outflow. After concentration is completed, acidic liquid is added through the fourth through hole, the first valve is opened, and the high-concentration calcium sulfate suspension enters the crystallization mechanism through the third through hole. The high-concentration calcium sulfate suspension has less water and is not easily diluted by the acidic liquid, which can improve the efficiency of whisker formation.

[0032] Specifically, the filter press assembly includes a second gear ring 861 fixedly mounted on the first pipe and fixedly mounted on the first rotating shaft, multiple fourth gears 862 rotatably mounted on the housing and meshing with the second gear ring, a threaded rod 863 fixedly mounted on the fourth gear, multiple sixth sliding grooves 864 fixedly mounted on the housing, a pressure plate 865 slidably mounted on the sixth sliding groove, and multiple sleeves 866 fixedly mounted on the pressure plate and sleeved on the threaded rod; the sleeves are threaded and mesh with the threaded rod; the diameter of the fourth gear is much larger than that of the second gear ring. Since the stirring assembly and the filter press assembly move up and down synchronously, but their movement distances are different, with the filter press assembly having a shorter movement distance, the diameter of the fourth gear needs to be larger than that of the second gear ring; the pressure plate is conical and used to squeeze whiskers, with an inclination angle the same as the bottom slope of the crystallization mechanism; the motor drives the second gear ring to rotate, which in turn drives the fourth gear to rotate, and the fourth gear drives the threaded rod to rotate. The pressure plate is limited by the sixth sliding groove, so when the threaded rod rotates, it will drive the pressure plate to move downward to filter the whiskers.

[0033] Specifically, the filter assembly includes multiple electrically operated telescopic rods 871 fixedly mounted on the first housing and filter screens 872 fixedly mounted on the electrically operated telescopic rods. After the whiskers are pressed and filtered, the electrically operated telescopic rods push the filter screens to close the third through hole and open the third valve to discharge the acidic liquid. The whiskers are filtered by the filter screens and will not be discharged. The second valve opens, and condensate will rinse the whiskers and discharge them from the third valve. After rinsing, the electrically operated telescopic rods push the filter screens to open the third through hole, and the whiskers are discharged from the third valve.

[0034] A method for preparing whisker calcium sulfate from produced water from high-salinity gas fields includes the following steps: a. The extracted water containing calcium sulfate is introduced into the first pipe through the second pipe, and then enters the purification unit through the first through hole, that is, the low-concentration calcium sulfate suspension enters the purification unit; b. The motor drives the first rotating shaft to rotate, which in turn drives the drive assembly to work. The drive assembly drives the stirring assembly to move up and down and stir the low-concentration calcium sulfate suspension. At the same time, the heater works to heat the low-concentration calcium sulfate suspension, causing water to evaporate and increasing the concentration of calcium sulfate in the extracted water, turning it into a high-concentration calcium sulfate suspension. c. The vacuum pump draws the evaporated steam into the water tank for condensation. As the weight of the condensate gradually increases, the water tank will gradually move downward, causing the closing component to move and close the first through hole. When the water tank slides to the bottom of the fourth chute, the first valve opens, and the high-concentration calcium sulfate suspension enters the crystallization mechanism through the first pipe and the third through hole. d. Acidic liquid is added into the shell through the sixth pipe. The high-concentration calcium sulfate suspension forms calcium sulfate whiskers in the acidic environment. The motor drives the first shaft to rotate, which in turn drives the filter press assembly to work, causing the pressure plate to move downward and crush the calcium sulfate whiskers. The electric telescopic rod pushes the filter screen to close the third through hole, and the second and third valves open. The acidic liquid is discharged through the third valve, and the water in the water tank will wash the calcium sulfate whiskers. After washing, the whiskers are discharged through the third valve. The electric telescopic rod controls the filter screen to open the third through hole, and the crushed calcium sulfate whiskers are discharged through the third valve.

[0035] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An apparatus and method for preparing calcium whisker sulfate from produced water in high-salinity gas fields, characterized in that: It includes a housing (1), a motor (2) fixed on the housing, a first pipe (3) fixed on the housing, a second pipe (4) fixed on the first pipe, a first rotating shaft (5) fixed on the motor, a concentration mechanism (6) fixed on the housing, a water storage mechanism (7) fixed on the housing, and a crystallization mechanism (8) fixed on the housing. The purification mechanism includes a first bracket (61) fixedly mounted on the first pipe and penetrated by a first rotating shaft, a first chute (62) fixedly mounted on the first pipe and the housing, a drive housing (63) rotatably mounted on the first chute, a plurality of second chute (64) fixedly mounted on the drive housing, a drive assembly (65) fixedly mounted on the first housing, a stirring assembly (66) rotatably mounted on the second chute, a plurality of first through holes (67) fixedly mounted on the first pipe, a partition plate (68) fixedly mounted on the first pipe, a plurality of first valves (69) fixedly mounted on the partition plate, and a heater (60) fixedly mounted on the housing.

2. The apparatus and method for preparing calcium whisker sulfate from produced water in high-salinity gas fields according to claim 1, characterized in that: The drive assembly includes a first gear ring (651) fixedly mounted on a first rotating shaft and a plurality of first gears (652) rotatably mounted on a first pipe and meshing with the first gear ring on one side and with the drive housing on the other side.

3. The apparatus and method for preparing calcium whisker sulfate from produced water in high-salinity gas fields according to claim 1, characterized in that: The stirring assembly includes multiple third grooves (661) fixed on the housing, a first ring (662) slidably disposed on the second groove, multiple first connecting rods (669) fixed on the first ring, a second ring (663) fixed on the first connecting rod, multiple second through holes (664) fixed on the second ring, a stirring rod (665) rotatably disposed on the first ring and passing through the second ring, multiple stirring blades (666) fixed on the stirring rod, multiple first racks (667) fixed on one side of the third groove, and a second gear (668) fixed at one end of the stirring rod and meshing with the first rack.

4. The apparatus and method for preparing calcium whisker sulfate from produced water in high-salinity gas fields according to claim 1, characterized in that: The water storage mechanism includes multiple fourth sluices (71) fixed on the first pipe, a water tank (72) slidably mounted on the fourth sluices, multiple first springs (73) fixed at one end on the water tank and at the other end on the housing, multiple second valves (74) fixed on the water tank, multiple third pipes (75) fixed on the water tank, an air pump (76) fixed on the housing, a fourth pipe (77) fixed on the air pump and the housing, a fifth pipe (78) fixed on the air pump and the housing, and a closing assembly (79) fixed on the first pipe and the water tank.

5. The apparatus and method for preparing calcium whisker sulfate from produced water in high-salinity gas fields according to claim 4, characterized in that: The closing assembly includes multiple fifth slide grooves (791) fixed on the first pipe, multiple second racks (792) fixed on the water tank, multiple third racks (793) slidably disposed on the fifth slide grooves, a baffle (794) fixed on the third racks, a third gear (795) rotatably disposed on the first pipe and meshing with the third and second racks, and a second spring (796) fixed at one end on the third rack and at the other end on the fifth slide grooves.

6. The apparatus and method for preparing whisker calcium sulfate from produced water from high-salinity gas fields according to claim 1, characterized in that: The crystallization mechanism includes a sixth pipe (81) fixed on the housing, a third valve (82) fixed on the housing, a plurality of third through holes (84) fixed on the first pipe, a plurality of fourth through holes (85) fixed on the housing, a pressure filter assembly (86) fixed on the housing, and a filter assembly (87) fixed on the first housing.

7. The apparatus and method for preparing whisker calcium sulfate from produced water of high-salinity gas fields according to claim 6, characterized in that: The filter press assembly includes a second gear ring (861) fixedly mounted on a first pipe and fixedly mounted on a first rotating shaft, a plurality of fourth gears (862) rotatably mounted on the housing and meshing with the second gear ring, a threaded rod (863) fixedly mounted on the fourth gear, a plurality of sixth sliding grooves (864) fixedly mounted on the housing, a pressure plate (865) slidably mounted on the sixth sliding groove, and a plurality of sleeves (866) fixedly mounted on the pressure plate and sleeved on the threaded rod.

8. The apparatus and method for preparing whisker calcium sulfate from produced water from high-salinity gas fields according to claim 6, characterized in that: The filter assembly includes multiple electrically operated telescopic rods (871) fixedly mounted on the first housing and filter screens (872) fixedly mounted on the electrically operated telescopic rods.

9. A method for preparing whisker calcium sulfate from produced water of a high-salinity gas field as described in any one of claims 1-8, characterized in that: Includes the following steps: a. The extracted water containing calcium sulfate is introduced into the first pipe through the second pipe, and then enters the purification unit through the first through hole, that is, the low-concentration calcium sulfate suspension enters the purification unit; b. The motor drives the first rotating shaft to rotate, which in turn drives the drive assembly to work. The drive assembly drives the stirring assembly to move up and down and stir the low-concentration calcium sulfate suspension. At the same time, the heater works to heat the low-concentration calcium sulfate suspension, causing water to evaporate and increasing the concentration of calcium sulfate in the extracted water, turning it into a high-concentration calcium sulfate suspension. c. The vacuum pump draws the evaporated steam into the water tank for condensation. As the weight of the condensate gradually increases, the water tank will gradually move downward, causing the closing component to move and close the first through hole. When the water tank slides to the bottom of the fourth chute, the first valve opens, and the high-concentration calcium sulfate suspension enters the crystallization mechanism through the first pipe and the third through hole. d. Acidic liquid is added into the shell through the sixth pipe. The high-concentration calcium sulfate suspension forms calcium sulfate whiskers in the acidic environment. The motor drives the first shaft to rotate, which in turn drives the filter press assembly to work, causing the pressure plate to move downward and crush the calcium sulfate whiskers. The electric telescopic rod pushes the filter screen to close the third through hole, and the second and third valves open. The acidic liquid is discharged through the third valve, and the water in the water tank will wash the calcium sulfate whiskers. After washing, the whiskers are discharged through the third valve. The electric telescopic rod controls the filter screen to open the third through hole, and the crushed calcium sulfate whiskers are discharged through the third valve.

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