A fluidized bed for induced crystallization cyclic crystallization granulation and system thereof

Abstract

The present application relates to the technical field of water treatment, in particular to a kind of induced crystallization circulating crystallization fluidized bed and system thereof, the fluidized bed includes water collection area, circulating crystallization area, filter area and mineralization area;Circulating crystallization area includes inner cylinder, outer cylinder outside the inner cylinder, outer cylinder bottom in the bottom of outer cylinder and throat pipe in the center of outer cylinder bottom, circulating crystallization area and water collection area are communicated;Filter area includes filter inner cavity, filter outer cavity outside the filter inner cavity, and filter outer cavity is communicated with circulating crystallization area by throat pipe;Mineralization area includes cylinder, water distributor disc in the cylinder, water distributor on the water distributor disc, flow guide disc below the water distributor disc, lower water inlet below the flow guide disc, air inlet communicated with lower part of cylinder, water collection disc in upper part of cylinder, for guiding the flow of water after mineralization to external;The upper part of the flow guide component of circulating crystallization area and the cylinder of mineralization area is communicated by crystallization particle conveying device.Utilizing the system, the hardness of seawater desalination product water can be adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a fluidized bed for induced crystallization and cyclic crystallization and granulation and a system thereof. BACKGROUND

[0002] How to handle and dispose of the crystalline particles generated after the power plant circulating sewage system adopts the induced crystallization and crystallization and granulation technology has become a problem that needs to be solved in reality. In addition, in the membrane seawater desalination project, due to the use of reverse osmosis membrane technology, most of the ions in seawater are intercepted, resulting in low hardness of the reverse osmosis product water. When used as drinking water, the water body lacks minerals such as calcium ions required by the human body. Therefore, when seawater desalination product water is used as drinking water, post-mineralization treatment is needed to improve the hardness of seawater desalination product water.

[0003] Currently, the main technology for mineralizing seawater desalination product water is to add chemical agents rich in calcium ions to the water body, such as calcium hydroxide Ca(OH)2, magnesium oxide calcium carbonate MgOCaCO3, and calcium chloride CaCl2. However, artificial addition of chemical agents can cause secondary pollution of seawater desalination product water due to other components contained in the chemical agents.

[0004] Therefore, there is an urgent need for a new induced crystallization and crystallization and granulation and mineralization technology coupling technology to adjust the hardness of seawater desalination product water without artificial addition of chemical agents. SUMMARY

[0005] The present application aims to solve the problem that the crystalline particles generated after the power plant circulating sewage system adopts the induced crystallization and crystallization and granulation technology are difficult to handle and dispose of in the prior art, and to solve the problem that the method of adding chemical agents to adjust the hardness of seawater desalination product water can cause secondary pollution of seawater desalination product water due to other components contained in the chemical agents, and to provide an induced crystallization and cyclic crystallization and granulation fluidized bed and a system thereof.

[0006] To achieve the above-mentioned purpose, the present application provides an induced crystallization and cyclic crystallization and granulation fluidized bed in a first aspect, which comprises a water collecting area, a cyclic crystallization area, a filtering area and a mineralization area which constitute an integrated structure.

[0007] The cyclic crystallization area comprises an inner cylinder, an outer cylinder arranged outside the inner cylinder, an outer cylinder bottom arranged at the bottom of the outer cylinder, a throat pipe arranged at the center of the outer cylinder bottom, and a flow guide component, the inlet of the throat pipe is arranged at the top of the filtering area, the outlet is arranged at the bottom of the cyclic crystallization area, and the cyclic crystallization area and the water collecting area are communicated.

[0008] The filter area comprises a filter inner cavity and a filter outer cavity arranged outside the filter inner cavity, the filter inner cavity is used for filtering the circulating blowdown water entering the filter inner cavity and flowing into the filter outer cavity, and the filter outer cavity is communicated with the circulating crystallization area through the throat pipe.

[0009] The mineralization area comprises a cylinder, a water distributor disc arranged inside the cylinder and separating the cylinder into upper and lower parts, a plurality of water distributors arranged on the water distributor disc, a nozzle of the water distributor arranged at the upper part of the cylinder, a water inlet head arranged at the lower part of the cylinder, a plurality of air inlet holes arranged on the side of the water inlet head, a flow guide disc arranged below the water distributor disc, a lower water inlet arranged below the flow guide disc, an air inlet communicated with the lower part of the cylinder, a water collecting disc arranged at the upper part of the cylinder, and a cyclone communicated with the seed end of the cyclone and used for guiding the mineralized water flow to the outside and / or to the cyclone.

[0010] Optionally, the ring side of the nozzle is provided with 4-8 water spraying surfaces, and each water spraying surface is provided with 5-9 nozzles.

[0011] Optionally, the nozzle at the center of each water spraying surface sprays water in the horizontal direction, and the other nozzles are inclined outward by 15-25° with the center nozzle as the axis.

[0012] Optionally, the upper part of the cylinder is provided with a crystallization granulation particle monitoring device for monitoring the height of the crystallization granulation particle layer on the water distributor disc.

[0013] Optionally, the height of the crystallization granulation particle layer ranges from 500 mm to 900 mm.

[0014] Optionally, the water collecting disc is in a U-shaped basin structure.

[0015] Optionally, the crystallization particle conveying device comprises an upper particle discharge ring, a lower particle discharge ring, and a plurality of connecting pipes connected between the upper particle discharge ring and the lower particle discharge ring, and the connecting pipes are provided with crystallization particle discharge control valves; the inner sides of the upper particle discharge ring and the lower particle discharge ring are both provided with a plurality of flow guide pipes, the flow guide pipes of the upper particle discharge ring are communicated with the bottom of the flow guide component of the circulating crystallization area, and the flow guide pipes of the lower particle discharge ring are communicated with the upper part of the cylinder.

[0016] Optionally, the flow guide component is arranged at the bottom center of the outer cylinder bottom, the cross section of the flow guide component is a smooth W shape, and a through hole is left in the center of the flow guide component for the throat pipe to pass through.

[0017] Optionally, an internal part of the filtering inner cavity is provided with a suction and pollution discharge component, which comprises a hollow shaft, a plurality of hollow tubular suction rods vertically arranged on the shaft and in communication with the side of the shaft, and a pollution discharge port arranged at the lower part of the shaft and in communication with the pollution discharge cavity.

[0018] A power system is arranged outside the top of the water collecting area and connected with the shaft through a transmission rod penetrating through the throat pipe, and the power system comprises a driving motor and a hydraulic piston.

[0019] Optionally, the water collecting area comprises a water collecting cavity, a flow guide ring arranged in the water collecting cavity, and an upper water outlet in communication with the water collecting cavity.

[0020] The second aspect of the present application provides a fluidized bed system for induced crystallization and cyclic crystallization and granulation, which comprises a cyclone and the above-mentioned fluidized bed, the seed end of the cyclone is in communication with the water collecting area, and the mineralized water end is in communication with the water outlet end of the water collecting disc.

[0021] According to the above technical solution, based on the induced crystallization and cyclic crystallization and granulation fluidized bed and system thereof, the treatment of power plant circulating pollution discharge water (high in suspended solids SS) through the filtering area can make the water entering the cyclic crystallization area clean, and the calcium ions in the clean circulating pollution discharge water can be removed through the cyclic crystallization area under the action of the seed, so as to realize crystallization and granulation, and the crystallization and granulation particles in the cyclic crystallization area can be transferred to the mineralization area through the crystallization particle conveying device, and react under the action of carbon dioxide to produce calcium bicarbonate, and the dissolved calcium ions can be used to adjust the hardness of the reverse osmosis produced water of seawater desalination, and finally the crystallization seed in the mineralized reverse osmosis produced water can be recycled to the cyclic crystallization area through the water collecting area for cyclic crystallization and granulation through the cyclone. Therefore, by coupling the crystallization and granulation and mineralization technologies, the hardness of the seawater desalination produced water can be adjusted without artificial addition of chemical agents, a large amount of carbon dioxide gas can be absorbed to effectively help carbon peak and carbon neutralization, and the calcium salt scaling tendency of the subsequent membrane treatment process can be effectively improved by removing the calcium ions in the clean circulating pollution discharge water.

[0022] Specifically, the reaction equation of the mineralization technology is as follows:

[0023] CaCO3+CO2+H2O=Ca 2+ +2HCO3 -

[0024] At the same time, by arranging a flow guide disc below the water distributor disc, the lower water inlet is arranged below the flow guide disc, the stable and uniform bottom water inlet can be realized, and the occurrence of water turbulence can be avoided, so as to improve the mineralization effect of the seawater desalination produced water.

[0025] 4-8 water spraying surfaces are arranged on the ring side of the nozzle, 5-9 nozzles are arranged on each water spraying surface, the nozzle at the center of each water spraying surface sprays water horizontally, and the other nozzles spray water outwardly at an angle of 15-25° with the center nozzle as the axis, so as to strengthen the contact between the seawater desalination water and the crystallization and granulation particles, thereby improving the mineralization effect on the seawater desalination water. The upper part of the cylinder is provided with a crystallization and granulation particle monitoring device for monitoring the height of the crystallization and granulation particle layer on the water distributor disc, and the height of the crystallization and granulation particle layer is 500-900 mm, so as to further strengthen the contact between the seawater desalination water and the crystallization and granulation particles.

[0026] The water collecting disc is in a U-shaped basin structure for draining the reverse osmosis water after mineralization, so as to maximize the avoidance of water flow disturbance of the conventional water discharge from the side wall, so that the water flow in the mineralization area rises more stably, thereby improving the mineralization effect on the seawater desalination water. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a cross-sectional structure schematic diagram of the induced crystallization circulating crystallization and granulation fluidized bed;

[0028] Figure 2 is a structure schematic diagram of the induced crystallization circulating crystallization and granulation fluidized bed system in a specific embodiment;

[0029] Figure 3 is a structure schematic diagram of the water distributor of the induced crystallization circulating crystallization and granulation fluidized bed;

[0030] Figure 4 is a nozzle arrangement diagram of the nozzle of the induced crystallization circulating crystallization and granulation fluidized bed;

[0031] Figure 5 is a cross-sectional structure schematic diagram of the flow guide disc of the induced crystallization circulating crystallization and granulation fluidized bed;

[0032] Figure 6 is a three-dimensional structure schematic diagram of the flow guide disc of the induced crystallization circulating crystallization and granulation fluidized bed;

[0033] Figure 7 is a structure schematic diagram of the water collecting disc of the induced crystallization circulating crystallization and granulation fluidized bed;

[0034] Figure 8 is a structure schematic diagram of the crystallization particle conveying device of the induced crystallization circulating crystallization and granulation fluidized bed;

[0035] Figure 9 is a structure schematic diagram of the flow guide component of the induced crystallization circulating crystallization and granulation fluidized bed;

[0036] Figure 10It is a structure diagram of the suction and pollution discharge component of the induced crystallization circulating crystallization granulation fluidized bed.

[0037] Explanation of reference numerals

[0038] 1, water collecting area; 11, water collecting cavity; 12, flow guide ring; 13, upper water outlet; 14, power system; 15, transmission rod; 2, circulating crystallization area; 21, inner cylinder; 22, outer cylinder; 23, outer cylinder bottom; 24, throat pipe; 25, flow guide component; 3, filtration area; 31, filtration inner cavity; 32, filtration outer cavity; 33, suction and pollution discharge component; 331, shaft rod; 332, suction rod; 333, suction nozzle; 334, pollution discharge port; 34, upper water inlet; 35, pollution discharge cavity; 36, discharge port; 4, mineralization area; 41, cylinder; 42, water distributor; 421, spray head; 422, nozzle; 423, water inlet head; 424, air inlet hole; 43, water distributor disc; 44, water collecting disc; 45, lower water outlet; 46, air inlet; 47, lower water inlet; 48, lower manhole; 49, upper manhole; 50, flow guide disc; 5, supporting leg; 6, crystalline particle conveying device; 61, upper particle discharge ring; 62, connecting pipe; 63, lower particle discharge ring; 64, crystalline particle discharge control valve; 7, cyclone; 71, cyclone water outlet; 8, conveying pump; 91, first valve; 92, second valve; 93, third valve. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory and are not intended to limit the present application.

[0040] In the description of the present application, the terms "first", "second" are only used for descriptive purposes and are not to be construed as indicating relative importance or implying the number of the technical features indicated. Therefore, unless otherwise specified, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "includes" and any variation thereof means non-exclusive inclusion, possible existence or addition of one or more other features, units, components and / or combinations thereof.

[0041] In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The first aspect of the present application provides a crystallization induction circulating crystallization fluidized bed, such as Figure 1 and 3-10, which comprises a water collecting area 1, a circulating crystallization area 2, a filtering area 3 and a mineralization area 4 constituting an integrated structure;

[0043] The circulating crystallization area 2 comprises an inner cylinder 21, an outer cylinder 22 arranged outside the inner cylinder 21, an outer cylinder bottom 23 arranged at the bottom of the outer cylinder 22, a throat pipe 24 and a flow guide component 25 arranged at the center of the outer cylinder bottom 23, the inlet of the throat pipe 24 is arranged at the top of the filtering area 3, and the outlet is arranged at the bottom of the circulating crystallization area 2, and the circulating crystallization area 2 is communicated with the water collecting area 1;

[0044] The filtering area 3 comprises a filtering inner cavity 31 and a filtering outer cavity 32 arranged outside the filtering inner cavity 31, the filtering inner cavity 31 is used for filtering the circulating sewage water entering the inside and flowing into the filtering outer cavity 32, and the filtering outer cavity 32 is communicated with the circulating crystallization area 2 through the throat pipe 24;

[0045] The mineralization area 4 comprises a cylinder 41, a water distributor disc 43 arranged inside the cylinder 41 and dividing the cylinder 41 into upper and lower parts, a plurality of water distributors 42 arranged on the water distributor disc 43, the spray head 421 of the water distributor 42 is located at the upper part of the cylinder 41, the water inlet head 423 is located at the lower part of the cylinder 41, and a plurality of air inlet holes 424 are arranged on the side surface of the water inlet head 423, a flow guide disc 50 arranged below the water distributor disc 43, a lower water inlet 47 arranged below the flow guide disc 50, an air inlet 46 communicated with the lower part of the cylinder 41, a water collecting disc 44 arranged at the upper part of the cylinder 41, used for guiding the mineralized water flow to the outside and / or to the cyclone 7, the seed end of the cyclone 7 is communicated with the water collecting area 1, and the upper part of the cylinder 41 is communicated with the flow guide component 25 through a crystallization particle conveying device 6.

[0046] Wherein, by arranging the flow guide disc 50 below the water distributor disc 43, the lower water inlet 47 is arranged below the flow guide disc 50, which can realize stable and uniform water inlet at the bottom, avoid the occurrence of water turbulence, and improve the mineralization effect of seawater desalination production water. Specifically, as shown in Figure 5 and 6 The seawater desalination production water to be mineralized enters the lower part of the cylinder 41 through the lower water inlet 47 and realizes stable and uniform water inlet under the flow guide effect of the flow guide disc 50, and further under the effect of the water distributor 42, the carbon dioxide and the water respectively enter the spray head 421 based on the air inlet holes 424 and the water inlet head 423 located at the lower part of the cylinder 41, so as to realize the mineralization of the seawater desalination production water at the upper part of the cylinder 41.

[0047] The bottom outer side of the cylinder 41 is provided with support legs 5. The upper and lower parts of the cylinder 41 are respectively provided with an upper manhole 49 and a lower manhole 48 for maintenance. In the initial state, both the upper manhole 49 and the lower manhole 48 are in a sealed state.

[0048] According to the above technical solution, based on this induced crystallization circulating crystallization granulation fluidized bed, the water entering the circulating crystallization zone is purified by treating the power plant's circulating wastewater through the filtration zone. Furthermore, under the action of seed crystals, calcium ions in the purified circulating wastewater are removed through the circulating crystallization zone to achieve crystallization granulation. The crystallized granules in the circulating crystallization zone are then transferred to the mineralization zone by a crystallization particle conveying device, where they react under the action of carbon dioxide to produce calcium bicarbonate. The dissolved calcium ions are used to adjust the hardness of the desalination reverse osmosis permeate. Thus, by coupling crystallization granulation and mineralization technologies, the hardness of the desalination permeate can be adjusted without the artificial addition of chemical agents. Furthermore, the absorption of large amounts of carbon dioxide effectively helps achieve carbon peaking and carbon neutralization, and the removal of calcium ions from the purified circulating wastewater can effectively improve the tendency for calcium salt scaling in subsequent membrane treatment processes.

[0049] In the induced crystallization circulating crystallization granulation fluidized bed described in this invention, preferably, the water collection zone 1 includes a water collection cavity 11, a guide ring 12 disposed within the water collection cavity 11, and an upper outlet 13 communicating with the water collection cavity 11. For example... Figure 1 As shown, by setting up the water collection zone 1 and the circulating crystallization zone 2, in practical applications, a certain amount of seed crystals (typically with a particle size of no more than 0.09 mm) are pre-added to the circulating crystallization zone 2. Then, the circulating wastewater from the filter outer cavity 32 enters the circulating crystallization zone 2 through the throat pipe 24. Under the guiding action of the guide ring 12 and the smooth W-shaped guide component 25 located at the center of the bottom of the outer cylinder bottom 23, the circulating wastewater carries the seed crystals and undergoes circulating fluidization to form crystallized granules. As the running time continues, the crystallized granules continuously grow. Finally, according to engineering experience, when the particle size of the crystallized granules grows to 2-3 mm, under the action of water pressure, the crystallization particle discharge control valve 64 of the crystallization particle conveying device 6 can periodically discharge them into the upper part of the cylinder 41 through the opening and closing control. Specifically, the implementation process based on the water collection zone 1 and the circulating crystallization zone 2 is described in patent publication number CN111547927A, and will not be repeated here.

[0050] In one specific implementation, such as Figure 1 , 8As shown in FIG. 9, the crystalline particle conveying device 6 comprises an upper particle discharge ring 61, a lower particle discharge ring 63 and a plurality of connecting pipes 62 connected between the upper particle discharge ring 61 and the lower particle discharge ring 63, and a crystalline particle discharge control valve 64 is arranged on the connecting pipe 62; a plurality of guide pipes are arranged at the inner side of the upper particle discharge ring 61 and the lower particle discharge ring 63, the guide pipes of the upper particle discharge ring 61 are communicated with the bottom of the guide component 25 of the circulating crystallization zone 2, and the guide pipes of the lower particle discharge ring 63 are communicated with the upper part of the barrel 41.

[0051] In the induced crystallization circulating crystallization granulation fluidized bed, preferably, as shown in FIG. 10, Figure 10 As shown in FIG. 11, the inside of the filter inner cavity 31 is provided with a suction and pollution discharge component 33, the suction and pollution discharge component 33 comprises a hollow shaft 331, a plurality of hollow tubular suction rods 332 vertically arranged on the shaft 331 and communicated with the side of the shaft 331, and a pollution discharge port 334 arranged at the lower part of the shaft 331 and communicated with the pollution discharge cavity 35; a power system 14 is arranged at the top outside of the water collecting zone 1 and connected with the shaft 331 through a transmission rod 15 penetrating through the throat pipe 24, and the power system 14 comprises a driving motor and a hydraulic piston.

[0052] In actual application, under the filter operation condition:

[0053] The circulating pollution water enters the filter inner cavity 31 through the upper water inlet 34 under the driving of the lifting pump, the circulating pollution water with high suspended solids SS enters the filter outer cavity 32 after the impurities are filtered out through the filter screen of the filter inner cavity 31, and then the circulating pollution water enters the circulating crystallization zone 2 through the throat pipe 24 to perform fluidized granulation. In this process, the driving motor and the hydraulic piston are in a shutdown state, and the discharge valve connected with the discharge port 36 is in a closed state.

[0054] Under the non-stop cleaning condition:

[0055] With the increase of the working water volume, the impurities on the filter screen of the filter inner cavity 31 continuously accumulate, and the pressure difference between the inside and outside of the filter screen increases. When the filter inner cavity 31 and the filter outer cavity 32 reach a certain pressure difference, the discharge valve connected with the blowdown cavity 35 is automatically opened, the driving motor is started to drive the sucking nozzle 333 to rotate and move downward along the axial direction under the action of the hydraulic piston. Since the discharge valve is opened, the pressure inside the sucking nozzle 333 is lower than the pressure of the filter outer cavity 32, and the clogging substances on the inner surface of the filter screen and the filter holes of the filter inner cavity 31 are sucked into the sucking nozzle 333 and discharged into the blowdown cavity 35 through the hollow shaft 331 and the blowdown port 334, and finally the clogging substances are discharged through the discharge valve connected with the discharge port 36. Under the driving of the driving motor and the action of the hydraulic piston, the sucking nozzle 333 rotates and moves downward, and in this process, the area sucked by the sucking nozzle 333 continuously increases until the clogging substances on the inner surface of the filter screen and the filter holes of the entire filter inner cavity 31 are all sucked and discharged. When the cleaning is completed, the driving motor and the hydraulic piston drive the sucking and blowdown component 33 to move upward along the axial direction until the sucking and blowdown component 33 moves to the starting position.

[0056] In the induced crystallization circulating fluidized bed for granulation, preferably, the ring side of the spray head 421 is provided with 4-8 water spraying surfaces, and 5-9 nozzles 422 are arranged on each water spraying surface. For example, the water spraying surfaces can be 4, 5, 6, 7, and 8, preferably 6. The nozzles 422 can be 5, 6, 7, 8, and 9, preferably 7. By arranging multiple water spraying surfaces on the ring side of the spray head 421 and arranging multiple nozzles 422 on the water spraying surfaces, the contact between the seawater desalination product water and the crystallization and granulation particles can be enhanced, thereby improving the mineralization effect on the seawater desalination product water.

[0057] In a further preferred embodiment, the central nozzle 422 on each water spraying surface sprays water horizontally, and the other nozzles 422 are inclined outward by 15-25° with the central nozzle 422 as the axis. For example, the angle of inclination of the other nozzles outward from the central nozzle 422 can be 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, and 25°, preferably 20°. As shown in the figure, by making the central nozzle 422 spray water horizontally and the other nozzles 422 spray water outward at a set angle with the central nozzle 422 as the axis, the contact between the seawater desalination product water and the crystallization and granulation particles can be further enhanced, thereby improving the mineralization effect on the seawater desalination product water. Figures 3-4

[0058] ​In the induced crystallization circulating crystallization granulation fluidized bed, preferably, the upper portion of the cylinder 41 is provided with a crystallization granulation particle monitoring device for monitoring the height of the crystallization granulation particle layer on the water distributor disc 43. By keeping the height of the crystallization granulation particle layer on the water distributor disc 43 within a certain range, for example, within the height range of 500-900 mm, preferably within the height range of 600-800 mm, the use of the water distributor 42 can be further strengthened to enhance the contact between the desalinated water and the crystallization granulation particles, thereby improving the mineralization effect and rate of the desalinated water.

[0059] In the induced crystallization circulating crystallization granulation fluidized bed, preferably, the water collecting disc 44 is in the form of a U-shaped basin structure for draining the mineralized reverse osmosis produced water and discharging it, which can maximize the avoidance of water flow disturbance caused by the discharge of conventional produced water from the side wall, making the water flow in the mineralization zone rise more smoothly, thereby improving the mineralization effect of the desalinated water. Specifically, as shown in Figure 7 the water collecting disc 44 is connected to the upper inner wall of the cylinder 41 through six inclined rectangular connecting plates and connected to the lower water outlet 45 at the bottom to guide the mineralized water to the outside.

[0060] The second aspect of the present application provides an induced crystallization circulating crystallization granulation fluidized bed system, which comprises a cyclone 7 and the above-mentioned fluidized bed. The seed end of the cyclone 7 is in communication with the water collecting area 1, and the mineralized water end is in communication with the water outlet end of the water collecting disc 44. Specifically, the water flowing out of the lower water outlet 45 of the water collecting disc 44 can be guided to the outside and / or to the cyclone 7, so that the crystallization seeds in the mineralized reverse osmosis produced water can be recovered to the circulating crystallization area 2 through the water collecting area 1 by the cyclone 7 for circulating crystallization granulation. Whether it flows to the outside or to the cyclone 7 depends on the actual needs, specifically, as shown in Figure 2 Mode a: when the crystallization seeds need to be recovered, the first valve 91 and the second valve 92 are opened, the third valve 93 is closed, and the delivery pump 8 is started to deliver the mineralized desalinated water into the cyclone 7. Under the action of the cyclone 7, the purified water flows out of the cyclone water outlet 71, and the separated crystallization seeds enter the circulating crystallization area 2 through the water collecting area 1 under the action of gravity for circulation. Mode b: when the crystallization seeds do not need to be recovered, the third valve 93 is opened, and the first valve 91 and the second valve 92 are closed, so that the mineralized desalinated water directly flows out. Mode c: of course, a part of the crystallization seeds can also be recovered, at this time, the first valve 91, the second valve 92 and the third valve 93 are opened, and the delivery pump 8 is started. However, in actual application, the commonly used modes are mode a and b.

[0061] The present application will be described in detail through examples below, but the protection scope of the present application is not limited thereto.

[0062] Example 1

[0063] Adopting such Figure 1 and 3 The induced crystallization circulating crystallization granulation fluidized bed shown in -10 is used for mineralization of seawater desalination products. Specifically, the induced crystallization circulating crystallization granulation fluidized bed includes a water collection zone 1, a circulating crystallization zone 2, a filtration zone 3, and a mineralization zone 4, which form an integrated structure.

[0064] The circulating crystallization zone 2 includes an inner cylinder 21, an outer cylinder 22 disposed outside the inner cylinder 21, an outer cylinder bottom 23 disposed at the bottom of the outer cylinder 22, and a throat 24 and a flow guiding component 25 disposed at the center of the outer cylinder bottom 23. The inlet of the throat 24 is disposed at the top of the filtration zone 3, and the outlet is disposed at the bottom of the circulating crystallization zone 2. The circulating crystallization zone 2 is connected to the water collection zone 1.

[0065] The filtration zone 3 includes an inner filtration cavity 31 and an outer filtration cavity 32 disposed outside the inner filtration cavity 31. The inner filtration cavity 31 is used to filter the circulating wastewater entering it before it flows into the outer filtration cavity 32. The outer filtration cavity 32 is connected to the circulating crystallization zone 2 through the throat 24.

[0066] The mineralization zone 4 includes a cylindrical body 41, a water distributor plate 43 disposed inside the cylindrical body 41 and dividing the cylindrical body 41 into upper and lower parts, several water distributors 42 disposed on the water distributor plate 43, the nozzles 421 of the water distributors 42 being located at the upper part of the cylindrical body 41, the inlet heads 423 being located at the lower part of the cylindrical body 41, and several air inlets 424 being provided on the side of the inlet heads 423, a guide plate 50 disposed below the water distributor plate 43, a lower water inlet 47 disposed below the guide plate 50, an air inlet 46 communicating with the lower part of the cylindrical body 41, and a water collection plate 44 disposed at the upper part of the cylindrical body 41 for guiding the mineralized water flow to the outside and / or to the hydrocyclone 7, the seed end of the hydrocyclone 7 communicating with the water collection zone 1; the upper part of the cylindrical body 41 and the guide component 25 are connected by a crystallization particle conveying device 6.

[0067] The water collecting pan 44 is a U-shaped basin structure for draining the mineralized reverse osmosis produced water and discharging through the lower water outlet 45; the crystalline particle conveying device 6 comprises an upper particle discharge ring 61, a lower particle discharge ring 63 and a plurality of connecting pipes 62 connected between the upper particle discharge ring 61 and the lower particle discharge ring 63, and a crystalline particle discharge control valve 64 is arranged on the connecting pipe 62; the inner sides of the upper particle discharge ring 61 and the lower particle discharge ring 63 are both spaced apart and provided with a plurality of flow guide pipes, the flow guide pipes of the upper particle discharge ring 61 are communicated with the bottom of the flow guide component 25 of the circulating crystallization zone 2, and the flow guide pipes of the lower particle discharge ring 63 are communicated with the upper part of the barrel 41;

[0068] The flow guide component 25 is arranged at the bottom center of the outer cylinder bottom 23, and the cross section of the flow guide component 25 is a smooth W shape and has a through hole for the passage of the throat pipe 24;

[0069] The inside of the filter inner cavity 31 is provided with a sucking and sewage discharging component 33, the sucking and sewage discharging component 33 comprises a hollow shaft 331, a plurality of hollow tubular sucking rods 332 vertically arranged on the shaft 331 and communicated with the side of the shaft 331, and a sewage discharge port 334 arranged at the lower part of the shaft 331 and communicated with the sewage discharge cavity 35;

[0070] The power system 14 is arranged at the top outside of the water collecting zone 1 and connected with the shaft 331 through the transmission rod 15 passing through the throat pipe 24, and the power system 14 comprises a driving motor and a hydraulic piston;

[0071] The water collecting zone 1 comprises a water collecting cavity 11, a flow guide ring 12 arranged in the water collecting cavity 11 and an upper water outlet 13 communicated with the water collecting cavity 11.

[0072] In actual application, the circulating sewage enters the filter inner cavity 31 through the upper water inlet 34 under the driving of the lifting pump, the circulating sewage with high suspended solids SS enters the filter outer cavity 32 after the impurities are filtered out by the filter screen of the filter inner cavity 31, then the circulating sewage enters the circulating crystallization zone 2 for fluidized granulation through the throat pipe 24, when the particle size of the crystalline granulation particles at the bottom of the flow guide component 25 grows to 2-3 mm, the crystalline granulation particles can be regularly discharged into the upper part of the barrel 41 under the opening and closing control of the crystalline particle discharge control valve 64 of the crystalline particle conveying device 6 under the action of water pressure, when the crystalline granulation particle layer on the water distributor disc 43 reaches a certain height, the seawater desalination produced water enters the lower part of the barrel 41 after being guided by the flow guide disc 50 through the lower water inlet 47, the carbon dioxide is introduced into the lower part of the barrel 41 through the air inlet 46, the water flows to the spray head 421 through the water inlet head 423, the carbon dioxide enters the spray head 421 through the air inlet hole 424, and finally the seawater desalination produced water is mineralized in the upper part of the barrel 41 and is drained to the outside through the water collecting pan 44.

[0073] The induced crystallization circulating crystallization granulation fluidized bed can realize the mineralization of the seawater desalination product water without adding chemical reagents, can effectively help carbon peak and carbon neutralization by absorbing a large amount of carbon dioxide, and can effectively improve the calcium salt scaling tendency of the subsequent membrane treatment process by removing calcium ions in the clean circulating sewage.

[0074] Example 2

[0075] Referring to Example 1, different from it, the ring side of the nozzle 421 is provided with 6 water spraying surfaces, each of which is provided with 7 nozzles 422, and the nozzle 422 at the center of each water spraying surface sprays water horizontally, and the other nozzles 422 are inclined outward by 20° around the central nozzle 422.

[0076] Compared with the scheme in Example 1, the induced crystallization circulating crystallization granulation fluidized bed can further strengthen the contact between the seawater desalination product water and the crystallization granulation particles, thereby improving the mineralization effect on the seawater desalination product water.

[0077] Example 3

[0078] Referring to Example 2, different from it, the upper part of the cylinder 41 is provided with a crystallization granulation particle monitoring device for monitoring the height of the crystallization granulation particle layer on the water distributor disc 43; the height of the crystallization granulation particle layer ranges from 600 to 800 mm.

[0079] Compared with the scheme in Example 2, the induced crystallization circulating crystallization granulation fluidized bed can further strengthen the contact between the seawater desalination product water and the crystallization granulation particles, thereby improving the mineralization effect on the seawater desalination product water.

[0080] Example 4

[0081] The induced crystallization circulating crystallization granulation fluidized bed system is used for the mineralization of seawater desalination product water. Figure 2 The induced crystallization circulating crystallization granulation fluidized bed system is used for the mineralization of seawater desalination product water.

[0082] Compared with the scheme in Example 3, the induced crystallization circulating crystallization granulation fluidized bed system can recycle the crystallization seeds in the mineralized reverse osmosis product water into the circulating crystallization area through the water collecting area, thereby realizing the circulating crystallization granulation.

[0083] The present application provides an induced crystallization circulating crystallization granulation fluidized bed and system thereof, wherein the circulating sewage water (high in suspended solids SS) of a power plant is treated by the filtering area, so that the water entering the circulating crystallization area is clean, and under the action of the crystal seeds, the calcium ions in the clean circulating sewage water are removed in the circulating crystallization area to realize crystallization and granulation, the crystallization and granulation particles in the circulating crystallization area are transferred to the mineralization area by the crystallization particle conveying device, and under the action of carbon dioxide, calcium bicarbonate is generated, the dissolved calcium ions are used to adjust the hardness of the reverse osmosis produced water of seawater desalination, and finally the crystallization seeds in the mineralized reverse osmosis produced water are recycled to the circulating crystallization area in the collecting area by the cyclone for circulating crystallization and granulation. Thus, by coupling the crystallization and granulation and mineralization technologies, the mineralization of the seawater desalination produced water can be realized without manually adding chemical agents, a large amount of carbon dioxide can be absorbed to effectively help carbon peak and carbon neutralization, and by removing the calcium ions in the clean circulating sewage water, the calcium salt scaling tendency of the subsequent membrane treatment process can be effectively improved.

[0084] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and in order to avoid unnecessary repetition, various possible combination modes are not described again. However, these simple modifications and combinations should also be regarded as the disclosed content of the present application and belong to the protection scope of the present application.

Claims

1. A fluidized bed for the induced crystallization of a circulating crystallization granulation, characterized in that, The induced crystallization circulating fluidized bed for crystallization granulation comprises a water collecting zone (1), a circulating crystallization zone (2), a filtering zone (3) and a mineralization zone (4) which are integrated into an integral structure; The circulating crystallization zone (2) comprises an inner cylinder (21), an outer cylinder (22) arranged outside the inner cylinder (21), an outer cylinder bottom (23) arranged at the bottom of the outer cylinder (22), a throat pipe (24) and a flow guide component (25) arranged at the center of the outer cylinder bottom (23), the inlet of the throat pipe (24) is arranged at the top of the filtering zone (3), and the outlet is arranged at the bottom of the circulating crystallization zone (2), and the circulating crystallization zone (2) is communicated with the water collecting zone (1); The filtering zone (3) comprises a filtering inner cavity (31) and a filtering outer cavity (32) arranged outside the filtering inner cavity (31), the filtering inner cavity (31) is used for filtering the circulating sewage water entering the filtering inner cavity (31) and then flowing into the filtering outer cavity (32), and the filtering outer cavity (32) is communicated with the circulating crystallization zone (2) through the throat pipe (24); The mineralization zone (4) comprises a cylinder (41), a water distributor disc (43) arranged inside the cylinder (41) and dividing the cylinder (41) into upper and lower parts, a plurality of water distributors (42) arranged on the water distributor disc (43), a spray head (421) of the water distributor (42) located at the upper part of the cylinder (41), a water inlet head (423) located at the lower part of the cylinder (41), a plurality of air inlet holes (424) arranged on the side surface of the water inlet head (423), a flow guide disc (50) arranged below the water distributor disc (43), a lower water inlet (47) arranged below the flow guide disc (50), an air inlet (46) communicated with the lower part of the cylinder (41), a water collecting disc (44) arranged at the upper part of the cylinder (41) and used for guiding the mineralized water to the outside, and a crystallization particle conveying device (6) communicated between the upper part of the cylinder (41) and the flow guide component (25).

2. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 1, characterized in that, The spray head (421) is provided with 4-8 water spraying surfaces, and each water spraying surface is provided with 5-9 nozzles (422).

3. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 2, characterized in that, The nozzle (422) located at the center of each water spraying surface sprays water horizontally, and the other nozzles (422) are inclined outward by 15-25° with the center nozzle (422) as the axis.

4. The induced crystallization circulating crystallizer prilling fluidized bed according to any of claims 1 - 3, characterized in that, The upper part of the cylinder (41) is provided with a crystallization granulation particle monitoring device for monitoring the height of the crystallization granulation particle layer on the water distributor disc (43).

5. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 4, characterized in that, The height of the crystallization granulation particle layer ranges from 500 mm to 900 mm.

6. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 1 or 5, characterized in that, The water collecting disc (44) is in the form of a U-shaped basin.

7. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 1, characterized in that, The crystalline particle conveying device (6) comprises an upper particle discharge ring (61), a lower particle discharge ring (63) and a plurality of connecting pipes (62) connected between the upper particle discharge ring (61) and the lower particle discharge ring (63), and a crystalline particle discharge control valve (64) is arranged on the connecting pipe (62); a plurality of guide pipes are arranged at intervals on the inner side of the upper particle discharge ring (61) and the lower particle discharge ring (63), the guide pipes of the upper particle discharge ring (61) are communicated with the bottom of the guide component (25) of the circulating crystallization zone (2), and the guide pipes of the lower particle discharge ring (63) are communicated with the upper part of the barrel (41).

8. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 1 or 7, characterized in that, The guide component (25) is arranged at the bottom center of the outer barrel bottom (23), and the cross section of the guide component (25) is a smooth W shape and has a through hole for the throat pipe (24) to pass through.

9. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 1, characterized in that, The inside of the filter inner cavity (31) is provided with a sucking and sewage component (33), which comprises a hollow shaft (331), a plurality of hollow tubular sucking rods (332) vertically arranged on the shaft (331) and communicated with the side of the shaft (331), and a sewage outlet (334) arranged at the lower part of the shaft (331) and communicated with the sewage cavity (35). A power system (14) is arranged outside the top of the water collecting zone (1) and connected with the shaft (331) through a transmission rod (15) penetrating through the throat pipe (24), and the power system (14) comprises a driving motor and a hydraulic piston.

10. The induced crystallization circulating crystallizer prilling fluidized bed according to claim 1, characterized in that, The water collecting zone (1) comprises a water collecting cavity (11), a guide ring (12) arranged in the water collecting cavity (11) and an upper water outlet (13) communicated with the water collecting cavity (11).

11. A fluid bed system for inducing crystallization of a crystallization recycle granulation process, characterized by, The fluidized bed system comprises a cyclone (7) and the fluidized bed of any one of claims 1-10, and the seed crystal end of the cyclone (7) is communicated with the water collecting zone (1), and the mineralized water end is communicated with the water outlet end of the water collecting disc (44).

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