Seed crystal feeding and discharging system and method suitable for granulation crystal water treatment technology

Abstract

The invention discloses a seed crystal feeding and discharging system and method suitable for a granulation crystal water treatment technology. The system comprises a linear sieve, a mature seed crystal feeding machine, an immature seed crystal collecting hopper, an immature seed crystal feeding machine and a seed crystal liquid feeding water tank, wherein an upper discharge port of the linear sieve is connected with a lower inlet of the mature seed crystal feeding machine, a middle outlet of the linear sieve is connected with the immature seed crystal collecting hopper, a bottom outlet of the immature seed crystal collecting hopper is connected with a lower inlet of the immature seed crystal feeding machine, and an upper outlet of the immature seed crystal feeding machine is connected with an upper feed port of the liquid seed crystal feeding water tank. The multi-stage mechanical screening seed crystal recovery device is arranged, saturated particles, unsaturated particles and liquid which grow fully are screened in a classified mode, cyclic utilization of the seed crystal particles is achieved, and the consumption of the seed crystal is reduced. According to the invention, the selection flexibility of seed crystal discharge opportunities is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a crystal seed adding and discharging system and method suitable for granulation crystallization water treatment technology. Background Art

[0002] Granulation crystallization technology is an important process widely used in the pharmaceutical, food and water treatment industries. Its basic principle is to control the crystallization of substances in supersaturated solutions to form particles with specific shapes and sizes. Granulation crystallization technology is: the solute in the solution loses its solubility in some way, thus forming a state that exceeds its saturation. In this case, a large number of solute molecules will gather together to form particles of various shapes and sizes. These particles can be further processed, such as filtration and drying, to obtain the desired crystalline product.

[0003] Granulation and crystallization technology can quickly convert solutes in solution into crystalline particles. Especially in industrial production, this feature enables the technology to process a large amount of materials in a short time and improve production efficiency. Stable effluent effect: In the field of water treatment, such as chemical crystallization granulation fluidized bed softening technology, this technology can continuously and stably reduce the hardness of water and ensure the stability of effluent water quality.

[0004] Granulation crystallization technology is suitable for softening pretreatment of unconventional water sources such as drainage water, industrial wastewater, and urban water because of its advantages of short reaction time, small footprint, and high precipitation efficiency. The principle of granulation crystallization technology is to add a certain proportion of seed particles into the water, add corresponding chemical agents in its fluidized state, and make the seed particles, ions to be removed, and agent ions fully contact and mix during the fluidization process of the seeds. Insoluble substances are continuously deposited on the surface of the seeds, and the volume of the seed particles continues to increase. Finally, the grown and mature particles are discharged to remove the target pollutants. This technology is suitable for removing calcium, phosphorus, fluorine, heavy metal ions and other ions in water. It has the advantages of high mass transfer rate, no sludge generation, low moisture content of crystal particles, and easy solid-liquid separation.

[0005] However, in current engineering practice, the growth size of seed particles varies greatly, seed discharge control is imprecise, and seed particles at all growth stages are discharged from the reactor at the same time during the discharge process, resulting in a large number of immature seed particles being directly lost after being discharged from the equipment. The loss of seeds is large during the discharge process, seed particles are frequently added, and the cost of seeds increases. In addition, the seed discharge and addition process of the granulation crystallization reactor is purely manual, with high operation frequency and high difficulty of single operation. The addition equipment is easily blocked by seed particles, which consumes a lot of manpower. The above reasons lead to less than ideal actual application of the technology and relatively limited application scenarios.

[0006] In view of the shortcomings of the current seed discharge and addition process that is solely carried out manually, with high operation frequency, high difficulty of single operation, huge manpower consumption, large difference in the particle size of discharged seeds, and a large number of growth period seeds being discharged and lost during the discharge, a seed system for a granulation crystallization reactor with high seed screening efficiency and easy operation is proposed. Summary of the invention

[0007] The purpose of the present invention is to solve the technical problems in the existing granulation crystallization technology, such as extensive control of seed discharge from the granulation crystallization reactor, serious loss of immature seeds during discharge, and frequent manual operation of seed addition and recovery, and to provide a seed addition and discharge system and method suitable for granulation crystallization water treatment technology.

[0008] To achieve the above object, the present invention adopts the following technical solution:

[0009] A seed crystal dosing and discharge system suitable for granulation crystal water treatment technology, comprising a linear screen, a mature seed crystal feeder, an immature seed crystal collection bucket, an immature seed crystal feeder and a seed crystal liquid dosing water tank;

[0010] Among them, the upper discharge port of the linear screen is connected to the lower inlet of the mature seed crystal loader, the middle outlet of the linear screen is connected to the immature seed crystal collection bucket, the bottom outlet of the immature seed crystal collection bucket is connected to the lower inlet of the immature seed crystal loader, and the upper outlet of the immature seed crystal loader is connected to the upper feed port of the seed liquid addition water tank; the multi-layer screen includes a multi-layer screen.

[0011] Furthermore, it also includes a new seed crystal feeder connected to the upper feed port of the seed crystal liquid addition water tank.

[0012] Furthermore, a seed liquid dosing water tank agitator and a seed liquid dosing water tank level meter are provided in the seed liquid dosing water tank.

[0013] Furthermore, the agitator of the crystal seed liquid dosing water tank adopts a propulsion blade agitator.

[0014] Furthermore, the crystal seed liquid addition water tank level meter adopts a non-contact level meter.

[0015] Furthermore, the discharge port of the seed liquid dosing water tank is connected to the seed dosing port of the granulation crystallization fluidized bed through a seed liquid dosing pump.

[0016] Furthermore, a seed liquid dosing flushing water pipe is provided at the inlet of the seed liquid dosing pump, and a seed liquid dosing water tank inlet pipe is provided at the upper water inlet of the seed liquid dosing water tank; the seed liquid dosing pump adopts a vane pump.

[0017] Furthermore, multiple layers of screens are arranged in sequence from top to bottom inside the linear screen, the number of screen layers is greater than or equal to, and the screen apertures decrease from top to bottom.

[0018] Furthermore, the mature seed crystal feeder and the immature seed crystal feeder are spiral feeders or chain bucket feeders.

[0019] A method for adding and discharging crystal seeds suitable for granulation crystal water treatment technology comprises the following steps:

[0020] The seed particles are transported to the seed liquid dosing water tank, and the seed liquid dosing water tank is filled with clean water at the same time. The fluidized state of the seed particles is maintained by the self-circulation and stirring action inside the seed dosing water tank, and the seed particles are transported to the granulation crystallization reactor body, and the raw water is transported to the granulation crystallization reactor body. The seed particles are evenly distributed and fluidized under the action of the water flow, and the reaction reagent is added to the granulation crystallization reactor body. The crystal particles grow on the surface of the seed particles to achieve the removal of substances in the raw water. After some of the seed particles grow and mature, the large-particle seed at the bottom of the granulation crystallization reactor is discharged to the linear screen feed port. The residual liquid, large particles and small particles are separated by the screening action of the linear screen. The mature large particles are discharged and discharged through the mature seed feeder. The small particles are re-dosed into the seed liquid dosing water tank through the immature seed collection bucket and the immature seed feeder, and then added to the granulation crystal reactor again for growth and utilization.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the present invention, a plurality of layers of screens are arranged in sequence from top to bottom inside the linear screen. Aiming at the uneven growth of seed particles in the granulation crystallization technology, a multi-stage mechanical screening device is provided to grade and screen the fully grown saturated particles, unsaturated particles, and liquids, so as to realize the recycling of seed particles and reduce the consumption of seeds. The present invention provides a multi-stage mechanical screening device to grade and screen the fully grown saturated particles, unsaturated particles, and liquids. The seed particles after screening are packaged for external transportation or secondary addition for reuse, so as to realize the recycling of seed particles, reduce the consumption of seeds, and improve the flexibility of seed discharge timing. The present invention is suitable for supporting seed addition and discharge of granulation crystal removal technology containing pollutants such as hardness, heavy metals, and phosphorus, which can improve the seed utilization efficiency of the granulation crystallization reactor, reduce the consumption of seeds, and reduce the difficulty of seed addition and recovery, and has good application prospects.

[0023] Furthermore, the present invention provides a seed liquid dosing pump to achieve fully automatic liquid feeding and dosing of seeds, so that the whole process can be automated with low labor consumption; and by providing a seed liquid dosing water tank agitator, high-speed circulation, stirring, flushing and other methods are adopted to maintain the fluidized state of the seed particles in the seed dosing system to prevent fouling caused by the seed particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the system structure of the seed addition and discharge system applicable to the granulation crystal water treatment technology of the present invention;

[0025] In the figure, 1-linear screen, 2-mature seed feeder, 3-weighing packaging machine, 4-immature seed collection bucket, 5-immature seed feeder, 6-new seed feeder, 7-seed liquid dosing water tank, 8-seed liquid dosing water tank agitator, 9-seed liquid dosing water tank level gauge, 10-seed liquid dosing pump, 11-seed liquid dosing water tank inlet pipe, 12-seed liquid dosing flushing water pipe. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The invention is suitable for removing calcium, phosphorus, fluorine, heavy metal ions and the like from water by a granulation crystallization method. By arranging a multi-stage mechanical screening seed recovery device and classifying and screening fully grown saturated particles, unsaturated particles and liquid, the recycling of seed particles is realized, and the consumption of seeds is reduced. A full-automatic liquid feeding seed addition device is arranged, and the fluidized state of seed particles in the seed addition system is maintained by arranging high-speed circulation, stirring, flushing and the like, so that the anti-fouling and blocking effect is good, the whole process can be realized in automatic operation, and the labor consumption is small. The invention uses the above-mentioned separately arranged multi-stage mechanical screening seed recovery device and the full-automatic liquid feeding seed addition device to classify and recover the discharged seeds, package and transport the mature seeds, and use the seed addition equipment to add the immature seeds to the granulation crystallization reactor for the second time, thereby greatly improving the utilization efficiency of the seed particles, improving the flexibility of selecting the seed discharge timing, and reducing the labor intensity.

[0031] refer to Figure 1 A seed adding and discharging system suitable for granulation crystallization water treatment technology mainly includes a linear screen 1, a mature seed feeder 2, a weighing packaging machine 3, an immature seed collection bucket 4, an immature seed feeder 5, a new seed feeder 6, a seed liquid adding water tank 7, a seed liquid adding water tank agitator 8, a seed liquid adding water tank level meter 9, a seed liquid adding pump 10, a seed liquid adding water tank inlet pipe 11 and a seed liquid adding flushing water pipe 12.

[0032] Among them, the upper discharge port of the linear screen 1 is connected to the lower inlet of the mature seed feeder 2, the upper outlet of the mature seed feeder 2 is connected to the hopper 3 of the weighing and packaging machine, the middle outlet of the linear screen 1 is connected to the immature seed collection bucket 4, the bottom outlet of the immature seed collection bucket 4 is connected to the lower inlet of the immature seed feeder 5, the upper outlet of the immature seed feeder 5 and the discharge port of the new seed feeder 6 are respectively connected to the upper feed port of the seed liquid dosing water tank 7, a seed liquid dosing water tank agitator 8 and a seed liquid dosing water tank level meter 9 are arranged inside the seed liquid dosing water tank 7, the inlet and outlet of the seed liquid dosing pump 10 are respectively connected to the discharge port of the seed liquid dosing water tank 7 and the seed dosing port of the granulation crystallization fluidized bed, the seed liquid dosing water tank inlet pipe 11 is connected to the upper water inlet of the seed liquid dosing water tank 7, and the seed liquid dosing flushing water pipe 12 is connected to the inlet pipe of the seed liquid dosing pump 10.

[0033] Furthermore, the linear screen 1 is provided with multiple layers of screens arranged from top to bottom, the number of screen layers is greater than or equal to 2, and the screen apertures decrease from top to bottom;

[0034] Furthermore, a water flow channel is provided at the bottom of the bottom screen of the linear screen 1 and leads to the outside of the device;

[0035] Furthermore, the mature seed feeder 2 and the immature seed feeder 5 can be a spiral feeder or a chain bucket feeder;

[0036] Furthermore, the new seed feeder 6 has an automatic weighing and metering function;

[0037] Furthermore, the seed liquid dosing water tank 7 includes a straight section and a bottom surface at the bottom of the straight section. The water outlet of the seed liquid dosing water tank 7 is arranged on the side wall of the straight section of the water tank, and the distance from the bottom of the tank is not less than 200 mm; the bottom surface is an arc-shaped bottom surface to avoid deposition.

[0038] Furthermore, the seed liquid dosing water tank agitator 8 adopts a propulsion blade agitator, and the stirring speed and rotation direction of the agitator can be adjusted;

[0039] Furthermore, the seed liquid dosing pump 10 should be a wear-resistant vane pump;

[0040] Furthermore, the seed liquid dosing water tank level meter 9 should be a non-contact level meter.

[0041] A seed adding and discharging method applicable to granulation crystal water treatment technology of the present invention comprises the following steps:

[0042] (1) Seed addition: Before the system is run for the first time, new seeds need to be added. Use a new seed loader 6 to transport solid seed particles to the seed liquid addition water tank 7. At the same time, fill the seed liquid addition water tank 7 with clean water, turn on the seed liquid addition water tank agitator 8 and the seed liquid addition pump 10, so that the mixed liquid maintains high-speed circulation in the seed addition water tank 7. The fluidized state of the seed particles is maintained by the self-circulation and stirring action inside the seed addition water tank 7. Then turn on the seed liquid addition pump 10, that is, open the pipeline to the seed addition port of the granulation crystallization equipment, and use the fluidization characteristics of the seed to transport the liquid into the granulation crystallization reactor body. After the addition is completed, open the seed liquid addition flushing water pipe 12 as appropriate to flush the seed addition pipeline;

[0043] (2) Operation: The raw water is lifted by the raw water feed pump and then enters the granulation crystallization reactor body from bottom to top. The filled seed crystals are evenly distributed and fluidized under the action of the water flow. Then, the reaction reagent is added to the granulation crystallization reactor body, and the crystal particles grow on the surface of the seed crystals, thereby removing the substances in the raw water;

[0044] (3) Seed discharge: After some of the seed particles grow and mature, the seed discharge pipeline is used to discharge the large-particle seed at the bottom of the granulation crystallization reactor to the feed port of the linear screen 1. The residual liquid, large particles and small particles are separated by the screening action of the linear screen 1. After the mature large particles are discharged, they are automatically packaged and transported through the mature seed feeder 2 and the weighing packaging machine 3. The small particles are re-added to the seed liquid addition water tank 7 through the immature seed collection bucket 4 and the immature seed feeder 5, and then added to the granulation crystallization reactor for growth and utilization;

[0045] (4) Seed replenishment: After the seed crystals are discharged, new seed crystal particles need to be added to replenish the seed crystal particles. The seed crystal replenishment method is the same as step (1).

[0046] Example 1

[0047] The water from a certain factory is high-salinity mine drainage water, which is treated by an equipment system and method suitable for granulation crystallization water treatment technology, and is equipped with a seed addition and discharge system suitable for granulation crystallization water treatment technology. The system operation method is as follows:

[0048] 1) Initial seed addition: Before the system is first activated, use the seed addition device to add new seeds to the granulation crystallization reactor: Use the new seed feeder to add the new seeds to the seed liquid addition water tank, and use the seed liquid addition pump to add liquid. The seed bed static filling height is 1100mm;

[0049] 2) Operation: Sodium hydroxide and sodium carbonate are used as treatment agents in the granulation crystallization reactor, and the seed particles gradually grow and mature.

[0050] 3) Seed discharge: During continuous operation, observe the fluidization and growth of the seed in the granulation crystallization reactor through the sampling port and the sight glass. When the continuous operation is 140h and the cumulative water treatment volume is 29500m 3 When using raw water, the static height of the seed bed increases to 2000mm, and the maximum seed particle size can reach 5mm. Then, some seeds are discharged to reduce the seed height, and a linear screen is used to separate the residual liquid, large particles, and small particles. After the mature large particles are discharged, they are automatically packaged and transported through the mature seed feeder and weighing packaging machine. The small particles are re-added to the seed liquid addition water tank through the immature seed feeder for reuse. After each seed discharge, the static height of the seed is reduced to about 1350mm. After screening, about 30% of the discharged seed particles are mature seeds, and the remaining 70% of the seed particles are immature seeds with a particle size of less than 3mm. The recycling effect of the seed particles is obvious.

[0051] 4) Seed supplement: The seed supplement method is the same as the seed addition method. After supplementation, the static filling height of the seed bed is 1600mm.

[0052] The present invention aims at the technical problems of extensive seed discharge control in the granulation crystallization reactor, serious loss during the discharge of immature seeds, frequent and difficult manual operation of seed addition and recovery, etc., and by setting a multi-stage mechanical screening device, the fully grown saturated particles, unsaturated particles, and liquid are graded and screened. The seed particles after screening are packaged and shipped out or reused for a second time, so as to realize the recycling of seed particles and reduce the consumption of seeds. In addition, a fully automatic liquid seed addition device is provided, and the whole process can be realized in an automated manner with low labor consumption. During the addition process, the seed particles are maintained in a fluidized state in the seed addition system by setting high-speed circulation, stirring, flushing, etc., and the seeds are prevented from being blocked by fouling caused by the seed particles. The above design greatly improves the utilization efficiency of seed particles, reduces the labor burden of seed addition, and improves the flexibility of selecting the timing of seed discharge, and has good application prospects.

[0053] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0054] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A seed adding and discharging system suitable for granulation crystallization water treatment technology, characterized in that: It comprises a linear screen (1), a mature seed crystal feeder (2), an immature seed crystal collection bucket (4), an immature seed crystal feeder (5) and a seed crystal liquid dosing water tank (7); The upper discharge port of the linear screen (1) is connected to the lower inlet of the mature seed crystal feeder (2), the middle outlet of the linear screen (1) is connected to the immature seed crystal collection bucket (4), the bottom outlet of the immature seed crystal collection bucket (4) is connected to the lower inlet of the immature seed crystal feeder (5), and the upper outlet of the immature seed crystal feeder (5) is connected to the upper feed port of the seed crystal liquid feeding water tank (7); the multi-layer screen comprises a multi-layer screen.

2. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 1 is characterized in that: It also includes a new crystal seed feeder (6) connected to the upper feed port of the crystal seed liquid addition water tank (7).

3. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 1 is characterized in that: A seed liquid dosing water tank agitator (8) and a seed liquid dosing water tank liquid level meter (9) are arranged in the seed liquid dosing water tank (7).

4. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 3 is characterized in that: The seed liquid dosing water tank agitator (8) adopts a propulsion type paddle agitator.

5. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 3 is characterized in that: The crystal seed liquid addition water tank level meter (9) adopts a non-contact level meter.

6. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 1 is characterized in that: The discharge port of the crystal seed liquid dosing water tank (7) is connected to the crystal seed dosing port of the granulation crystallization fluidized bed via the crystal seed liquid dosing pump (10).

7. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 6 is characterized in that: The inlet of the crystal seed liquid dosing pump (10) is provided with a crystal seed liquid dosing flushing water pipe (12), and the upper water inlet of the crystal seed liquid dosing water tank (7) is provided with a crystal seed liquid dosing water tank inlet pipe (11); the crystal seed liquid dosing pump (10) adopts a vane pump.

8. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 1 is characterized in that: The linear screen (1) is internally provided with multiple layers of screens arranged sequentially from top to bottom, the number of screen layers is greater than or equal to (2), and the apertures of the screens decrease sequentially from top to bottom.

9. The seed adding and discharging system suitable for granulation crystallization water treatment technology according to claim 1 is characterized in that: The mature seed crystal feeder (2) and the immature seed crystal feeder (5) are spiral feeders or chain bucket feeders.

10. A method for adding and discharging crystal seeds suitable for granulation crystal water treatment technology based on the system according to any one of claims 1 to 9, characterized in that: The following steps are involved: The seed particles are transported to the seed liquid dosing water tank (7), and at the same time, the seed liquid dosing water tank (7) is filled with clean water. The seed particles are maintained in a fluidized state through the self-circulation and stirring action inside the seed dosing water tank (7), and are transported to the granulation crystallization reactor body. The raw water is transported to the granulation crystallization reactor body. The seed particles are evenly distributed and fluidized under the action of the water flow. The reaction reagent is added to the granulation crystallization reactor body, and the crystal particles grow on the surface of the seed particles, thereby achieving the original After the substances in the water are removed, some of the seed crystal particles grow and mature, and the large-particle seed crystals at the bottom of the granulation crystallization reactor are discharged to the feed port of the linear screen (1). After the linear screen (1) screens, the residual liquid, large particles and small particles are separated respectively. The mature large particles are discharged and discharged through the mature seed crystal feeder (2). The small particles are re-added to the seed liquid addition water tank (7) through the immature seed crystal collection bucket (4) and the immature seed crystal feeder (5), and then added to the granulation crystallization reactor again for growth and utilization.

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