A device for efficient dewatering of desulfurized gypsum

Abstract

The utility model discloses a kind of for desulfurization gypsum efficient dewatering device, including separating device, one-stage slurry cavity, two-stage slurry cavity and three-stage slurry cavity are provided in separating device, one-stage filter element is provided between one-stage slurry cavity and two-stage slurry cavity, two-stage filter element is provided between two-stage slurry cavity and three-stage slurry cavity, one-stage control valve is connected on one-stage slurry cavity, two-stage control valve is connected on two-stage slurry cavity, three-stage control valve is connected on three-stage slurry cavity;Vacuum belt dewatering machine is provided with filter cloth on vacuum belt dewatering machine, first ultrasonic thickness gauge, second ultrasonic thickness gauge and third ultrasonic thickness gauge are connected on vacuum belt dewatering machine;Control unit, control unit is connected with one-stage control valve, two-stage control valve, three-stage control valve, first ultrasonic thickness gauge, second ultrasonic thickness gauge and third ultrasonic thickness gauge.

Description

Technical Field

[0001] This utility model belongs to the field of desulfurization technology, and specifically relates to a high-efficiency dehydration device for desulfurized gypsum. Background Technology

[0002] In industrial production, chimneys are used to discharge waste gas from factories. This waste gas needs to be treated by desulfurization towers to remove some air pollutants, such as sulfur dioxide, thereby significantly reducing the sulfur dioxide content in the flue gas and mitigating air pollution. Currently, the limestone-gypsum wet desulfurization process is used for flue gas desulfurization. The gypsum produced as a byproduct of the desulfurization process can be used for subsequent applications, such as in the production of gypsum board.

[0003] During the desulfurization process, the crystallization state of the slurry in the desulfurization tower, especially the particle size and shape characteristics of gypsum crystals, cannot be monitored. Therefore, when the slurry is spread on the filter cloth, gypsum crystals of different sizes and shapes are randomly distributed on the surface of the filter cloth. This mixed state makes the gypsum dewatering and filtration process face greater resistance, which brings certain challenges to the entire dewatering process. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency dehydration device for desulfurized gypsum, so as to solve the problem of how to efficiently dehydrate gypsum in the prior art.

[0005] A high-efficiency dewatering device for desulfurized gypsum, comprising:

[0006] A separation device is provided, comprising a primary slurry cavity, a secondary slurry cavity, and a tertiary slurry cavity. A primary filter element is provided between the primary and secondary slurry cavities, and a secondary filter element is provided between the secondary and tertiary slurry cavities. A primary control valve is connected to the primary slurry cavity, a secondary control valve is connected to the secondary slurry cavity, and a tertiary control valve is connected to the tertiary slurry cavity.

[0007] A vacuum belt dewatering machine is provided, wherein a filter cloth is installed on the vacuum belt dewatering machine, and a first ultrasonic thickness gauge, a second ultrasonic thickness gauge, and a third ultrasonic thickness gauge are connected to the vacuum belt dewatering machine. The first ultrasonic thickness gauge is used to detect the thickness of gypsum distributed on the filter cloth in the primary slurry cavity, the second ultrasonic thickness gauge is used to detect the thickness of gypsum distributed on the filter cloth in the secondary slurry cavity, and the third ultrasonic thickness gauge is used to detect the thickness of gypsum distributed on the filter cloth in the tertiary slurry cavity.

[0008] The control unit is connected to the primary control valve, the secondary control valve, the tertiary control valve, the first ultrasonic thickness gauge, the second ultrasonic thickness gauge, and the third ultrasonic thickness gauge.

[0009] Preferably, a first ultrasonic thickness gauge is connected to each end of the vacuum belt dewatering machine, and the first ultrasonic thickness gauges are diagonally arranged on the vacuum belt dewatering machine; a second ultrasonic thickness gauge is connected to each end of the vacuum belt dewatering machine, and the second ultrasonic thickness gauges are diagonally arranged on the vacuum belt dewatering machine; and two third ultrasonic thickness gauges are connected to the middle of the vacuum belt dewatering machine.

[0010] Preferably, the device further includes a gas-liquid mixing and spraying device, which is connected to a first spray gun and a second spray gun. The first spray gun is used to spray and clean the primary filter element and the secondary filter element in the separation device, and the second spray gun is used to spray and clean the filter cloth.

[0011] Preferably, the system also includes a hydrocyclone, which is connected to the primary slurry cavity via a first pipe, connected to the desulfurization tower via a second pipe, and connected to a gypsum discharge pump via a third pipe, which is connected to the desulfurization tower.

[0012] Preferably, it also includes a buffer tank, which is connected to the three-stage slurry cavity via a fourth pipe and to the hydrocyclone via a fifth pipe.

[0013] Preferably, it also includes a wastewater collection tank, which is connected to the buffer tank via a sixth pipe.

[0014] Compared with existing technologies, this utility model has the following advantages: By adding a separation device between the hydrocyclone and the vacuum belt dewatering machine, the desulfurization slurry from the desulfurization tower is separated by particle size. Through the control valve and ultrasonic thickness gauge, the coarse, medium and fine gypsum particles in the desulfurization slurry are sequentially arranged from bottom to top on the filter cloth of the vacuum belt dewatering machine. This results in larger gaps formed by the large-diameter gypsum particles at the bottom, making it easier for air to be extracted, reducing the filtration resistance and improving the efficiency of gypsum dewatering. This ensures that the moisture content of the dewatered gypsum is below 10%. At the same time, the control valve, ultrasonic thickness gauge and vacuum belt dewatering machine are all controlled by the control unit, which enables automated dewatering of desulfurized gypsum. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of a high-efficiency dehydration device for desulfurized gypsum provided by this utility model;

[0017] Figure 2 This is a schematic diagram of the installation of the ultrasonic thickness gauge in the dehydration device provided by this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "longitudinal," and "lateral" are used interchangeably.

[0020] The terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "top surface," "bottom surface," "inner," "outer," "inner side," and "outer side" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0023] See Figure 1 A high-efficiency dewatering device for desulfurized gypsum, comprising:

[0024] The separation device 1 includes a primary slurry cavity 11, a secondary slurry cavity 12, and a tertiary slurry cavity 13. A primary filter element 14 is installed between the primary slurry cavity 11 and the secondary slurry cavity 12, and a secondary filter element 15 is installed between the secondary slurry cavity 12 and the tertiary slurry cavity 13. A primary control valve 16 is connected to the primary slurry cavity 11, a secondary control valve 17 is connected to the secondary slurry cavity 12, and a tertiary control valve 18 is connected to the tertiary slurry cavity 13.

[0025] Each of the primary slurry cavity 11, secondary slurry cavity 12, and tertiary slurry cavity 13 is equipped with a desulfurization slurry flow pipe. The primary control valve 16, secondary control valve 17, and tertiary control valve 18 are each connected to the corresponding desulfurization slurry flow pipe of their respective slurry cavity. The primary control valve 16, secondary control valve 17, and tertiary control valve 18 are valves capable of withstanding high temperatures and corrosion, and capable of automated control; for example, electric PTFE butterfly valves or high-pressure steam shut-off valves may be used.

[0026] After being filtered by the primary filter element 14, the desulfurization slurry in the primary slurry cavity 11 contains coarse-sized gypsum particles. The desulfurization slurry flowing into the secondary slurry cavity 12 contains medium-sized gypsum particles. After being filtered by the secondary filter element 15, the desulfurization slurry flowing into the tertiary slurry cavity 13 contains fine-sized gypsum particles.

[0027] The desulfurization slurry in the primary slurry cavity 11 contains coarse gypsum particles with a diameter of 70 μm or larger, the desulfurization slurry in the secondary slurry cavity 12 contains medium gypsum particles with a diameter of 50 μm to 70 μm, and the desulfurization slurry in the tertiary slurry cavity 13 contains fine gypsum particles with a diameter of 20 μm to 50 μm.

[0028] The primary filter element 14 and the secondary filter element 15 are configured according to the particle size of the gypsum particles in the cavities of each stage of the slurry. For example, in this embodiment, the primary filter element 14 is a ceramic composite filter element with a pore size of 70 μm, a porosity of 43%, and a temperature resistance of 200℃ or higher. The secondary filter element 15 is also a ceramic composite filter element with a pore size of 50 μm, a porosity of 43%, and a temperature resistance of 200℃ or higher. Furthermore, the ceramic composite filter element is less likely to react with the desulfurization slurry, extending the service life of the filter element and ensuring filtration efficiency.

[0029] A vacuum belt dewatering machine 2 is provided, on which a filter cloth 3 is installed. A first ultrasonic thickness gauge 41, a second ultrasonic thickness gauge 42, and a third ultrasonic thickness gauge 43 are connected to the vacuum belt dewatering machine 2. The first ultrasonic thickness gauge 41 is used to detect the thickness of gypsum distributed on the filter cloth 3 in the primary slurry cavity 11; the second ultrasonic thickness gauge 42 is used to detect the thickness of gypsum distributed on the filter cloth 3 in the secondary slurry cavity 12; and the third ultrasonic thickness gauge 43 is used to detect the thickness of gypsum distributed on the filter cloth 3 in the tertiary slurry cavity 13. A control unit is connected to the primary control valve 16, the secondary control valve 17, the tertiary control valve 18, the first ultrasonic thickness gauge 41, the second ultrasonic thickness gauge 42, and the third ultrasonic thickness gauge 43. The control unit is a PLC control unit.

[0030] See Figure 1In this invention, a separation device 1 is added between the hydrocyclone 6 and the vacuum belt dewatering machine 2. The separation device 1 is equipped with a primary filter element 14 and a secondary filter element 15, which can form a slurry containing coarse-diameter gypsum particles in the primary slurry cavity 11, a slurry containing medium-diameter gypsum particles in the secondary slurry cavity 12, and a slurry containing fine-diameter gypsum particles in the tertiary slurry cavity 13. During gypsum dewatering, the control unit prioritizes distributing the slurry containing coarse-diameter gypsum particles onto the filter cloth 3 of the vacuum belt dewatering machine 2 via the primary control valve 16. The thickness of the coarse-diameter gypsum filter cake 100 formed by the coarse gypsum particles on the filter cloth 3 is detected by the first ultrasonic thickness gauge 41. When the thickness of the coarse-diameter gypsum filter cake 100 reaches the detected value, the control unit controls the primary control valve 41 to close and the secondary control valve 42 to open, distributing the slurry containing medium-diameter gypsum particles onto the coarse-diameter gypsum filter cake 100 on the filter cloth 3. At this time, the medium-diameter gypsum particles cover the coarse-diameter gypsum filter cake 100 formed by the coarse gypsum particles, forming a medium-diameter gypsum filter cake 200 on the coarse-diameter gypsum filter cake 100, which is detected by the second ultrasonic thickness gauge 42. When the thickness of the medium-sized gypsum filter cake 200 formed by medium-sized gypsum particles reaches the detection value, the control unit controls the secondary control valve 17 to close and the tertiary control valve 18 to open, distributing the slurry containing fine-sized gypsum particles onto the medium-sized gypsum filter cake 200. At this time, the fine-sized gypsum particles cover the medium-sized gypsum filter cake 200 to form a fine-sized gypsum filter cake 300. The thickness of the fine-sized gypsum filter cake 300 is detected by the third ultrasonic thickness gauge 43. When the thickness of the fine-sized gypsum filter cake 300 formed by fine-sized gypsum particles reaches the detection value, the control unit controls the tertiary control valve 18 to close and controls the vacuum pump connected to the vacuum belt dewatering machine 2 to dewater the filter cake on the filter cloth 3.

[0031] See Figure 2 The vacuum belt dewatering machine 2 has a first ultrasonic thickness gauge 41 connected to each end, and the first ultrasonic thickness gauge 41 is diagonally arranged on the mounting frame of the vacuum belt dewatering machine 1; the vacuum belt dewatering machine 2 has a second ultrasonic thickness gauge 42 connected to each end, and the second ultrasonic thickness gauge 42 is diagonally arranged on the mounting frame of the vacuum belt dewatering machine; and two third ultrasonic thickness gauges 41 are connected to the middle of the vacuum belt dewatering machine 2.

[0032] When the desulfurization slurry flows from the primary slurry cavity 11, the secondary slurry cavity 12 and the tertiary slurry cavity 13 in the separation device to the filter cloth 3 on the vacuum belt dewatering machine 2, the desulfurization slurry containing coarse-diameter gypsum particles in the primary slurry cavity 11 must first be spread evenly on the filter cloth 3. At this time, first ultrasonic thickness gauges 41 are respectively set at both ends of the vacuum belt dewatering machine 2, and the two first ultrasonic thickness gauges 41 are set diagonally. The detection is performed at the end of the filter cloth 3. Because when the desulfurization slurry flows to the filter cloth 3, the places on the filter cloth 3 where the desulfurization slurry flows first will accumulate coarse gypsum particles first. Therefore, the thickness of coarse gypsum at different positions on the filter cloth 3 will be different. Selecting to detect the coarse particle size gypsum filter cake 100 at both ends of the filter cloth 3, that is, the first ultrasonic thickness gauge 41 can detect the coarse particle size gypsum filter cake 100 at both ends of the filter cloth 3, indicates that the desulfurization slurry has been evenly distributed on the filter cloth 3, and the coarse gypsum particles have been evenly distributed on the filter cloth 3. This can form a large area of ​​gypsum filter cake in one go. Similarly, the reason for the position setting of the second ultrasonic thickness gauge 42 is as above. When medium-sized gypsum filter cake 200 is detected at both ends of the filter cloth 3, it means that the desulfurization slurry containing medium-sized particles has been evenly distributed on the coarse-sized gypsum filter cake 100. In other words, the desulfurization slurry containing medium-sized particles covers a large area of ​​the coarse-sized gypsum filter cake 100.

[0033] For the third ultrasonic thickness gauge 41, after the coarse-particle-size gypsum filter cake 100 is evenly spread on the filter cloth 3, the medium-particle-size gypsum filter cake 200 also covers the coarse-particle-size gypsum filter cake 100. At this time, the fine-particle-size gypsum filter cake 100 can be detected at the middle position of the filter cloth 3. Of course, the fine-particle-size gypsum filter cake 100 can also be detected at both ends of the filter cloth 3.

[0034] See Figure 1 It also includes a gas-liquid mixing and spraying device 5, on which a first spray gun 51 and a second spray gun 52 are connected. The first spray gun 51 is used to spray and clean the primary filter element 14 and the secondary filter element 15 in the separation device 1, and the second spray gun 52 is used to spray and clean the filter cloth 3.

[0035] The gas-liquid mixing injection device 5 premixes gas and liquid in the nozzle to form a gas-liquid two-phase flow (atomized state), which is then sprayed out by the injection gun to clean the primary filter element 14, the secondary filter element 15 and the filter element 3. The gas-liquid mixing injection device 5 can enhance the penetration and cleaning ability of the microporous structure, thus ensuring the cleaning effect of the primary filter element 14, the secondary filter element 15 and the filter element 3.

[0036] See Figure 1It also includes a hydrocyclone 6, which is connected to the primary slurry cavity 11 via a first pipe 71, connected to the desulfurization tower 8 via a second pipe 72, and connected to the gypsum discharge pump 9 via a third pipe 73. The gypsum discharge pump 9 is connected to the desulfurization tower 8.

[0037] The gypsum discharge pump 9 extracts the slurry from the desulfurization tower 8 and sends it into the hydrocyclone 6 through the third pipe 73. The underflow slurry concentrated in the hydrocyclone 6 is sent into the primary slurry cavity 11 of the separation device 1 through the first pipe 71 for separation. The dilute overflow liquid in the hydrocyclone 6 is returned to the desulfurization tower 8 through the second pipe 72. The overflow liquid contains the reagents required for desulfurization treatment and is discharged into the desulfurization tower 8 for recycling.

[0038] See Figure 1 It also includes a buffer tank 10, which is connected to the three-stage slurry cavity 13 via a fourth pipe 74 and to the hydrocyclone 6 via a fifth pipe 75; it also includes a wastewater collection tank 19, which is connected to the buffer tank 10 via a sixth pipe 76.

[0039] The separation device 1 has a through hole at the top of the three-stage slurry cavity 13, and a filter element is installed at the through hole. The gypsum slurry containing fine particles separated in the three-stage slurry cavity 13 is discharged into the filter cloth 3 through the three-stage control valve 18. The finer gypsum in the three-stage slurry cavity 13 enters the buffer tank 10 through the through hole at the top and the fourth pipe 74. The buffer tank 10 contains desulfurization wastewater with extremely low solid content. The desulfurization wastewater with extremely low solid content in the buffer tank 10 can re-enter the hydrocyclone 6 through the fifth pipe 75, or enter the wastewater collection tank 19 through the sixth pipe 76.

[0040] An ultrasonic solids content sensor 20 is installed inside the buffer tank 10. This sensor is connected to a control unit to detect the solids content of the desulfurization wastewater in the buffer tank 10. When the detected solids content exceeds a set value, the control unit opens the control valve 21 on the fifth pipe 75, allowing the internal desulfurization wastewater in the buffer tank 10 to enter the hydrocyclone 6 for further treatment. The valve on the sixth pipe 76 is set to manual operation.

[0041] In summary, this utility model provides a high-efficiency dewatering device for desulfurized gypsum. A separation device is added between the hydrocyclone and the vacuum belt dewatering machine to separate the particle size of the desulfurized slurry from the desulfurization tower. Through a control valve and an ultrasonic thickness gauge, coarse, medium, and fine gypsum particles from the desulfurization slurry are sequentially arranged from bottom to top on the filter cloth of the vacuum belt dewatering machine. This results in larger gaps formed by the larger gypsum particles at the bottom, making it easier for air to escape, reducing filtration resistance and improving the efficiency of gypsum dewatering. This ensures that the moisture content of the dewatered gypsum is below 10%. Furthermore, the control valve, ultrasonic thickness gauge, and vacuum belt dewatering machine are all controlled by a single control unit, enabling automated dewatering of the desulfurized gypsum.

[0042] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A high-efficiency dewatering device for desulfurized gypsum, characterized in that, include A separation device is provided, comprising a primary slurry cavity, a secondary slurry cavity, and a tertiary slurry cavity. A primary filter element is provided between the primary and secondary slurry cavities, and a secondary filter element is provided between the secondary and tertiary slurry cavities. A primary control valve is connected to the primary slurry cavity, a secondary control valve is connected to the secondary slurry cavity, and a tertiary control valve is connected to the tertiary slurry cavity. A vacuum belt dewatering machine is provided, wherein a filter cloth is installed on the vacuum belt dewatering machine, and a first ultrasonic thickness gauge, a second ultrasonic thickness gauge, and a third ultrasonic thickness gauge are connected to the vacuum belt dewatering machine. The first ultrasonic thickness gauge is used to detect the thickness of gypsum distributed on the filter cloth in the primary slurry cavity, the second ultrasonic thickness gauge is used to detect the thickness of gypsum distributed on the filter cloth in the secondary slurry cavity, and the third ultrasonic thickness gauge is used to detect the thickness of gypsum distributed on the filter cloth in the tertiary slurry cavity. The control unit is connected to the primary control valve, the secondary control valve, the tertiary control valve, the first ultrasonic thickness gauge, the second ultrasonic thickness gauge, and the third ultrasonic thickness gauge.

2. The high-efficiency dewatering device for desulfurized gypsum according to claim 1, characterized in that, The vacuum belt dewatering machine has a first ultrasonic thickness gauge connected to each end, and the first ultrasonic thickness gauges are diagonally arranged on the vacuum belt dewatering machine; the vacuum belt dewatering machine has a second ultrasonic thickness gauge connected to each end, and the second ultrasonic thickness gauges are diagonally arranged on the vacuum belt dewatering machine; and two third ultrasonic thickness gauges are connected to the middle of the vacuum belt dewatering machine.

3. The high-efficiency dewatering device for desulfurized gypsum according to claim 1, characterized in that, It also includes a gas-liquid mixing and spraying device, which is connected to a first spray gun and a second spray gun. The first spray gun is used to spray and clean the primary filter element and the secondary filter element in the separation device, and the second spray gun is used to spray and clean the filter cloth.

4. The high-efficiency dewatering device for desulfurized gypsum according to claim 1, characterized in that, It also includes a hydrocyclone, which is connected to the primary slurry cavity through a first pipe, connected to the desulfurization tower through a second pipe, and connected to a gypsum discharge pump through a third pipe, which is connected to the desulfurization tower.

5. The high-efficiency dewatering device for desulfurized gypsum according to claim 1, characterized in that, It also includes a buffer tank, which is connected to the three-stage slurry cavity via a fourth pipe and to the hydrocyclone via a fifth pipe.

6. The high-efficiency dewatering device for desulfurized gypsum according to claim 5, characterized in that, It also includes a wastewater collection tank, which is connected to the buffer tank via a sixth pipe.

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