Double dissolving tank and fly ash pre-dissolving system using double dissolving tank

Abstract

The double dissolving tank and the fly ash pre-dissolving system using the double dissolving tank relate to the field of fly ash treatment. The double dissolving tank comprises a tank body, wherein the tank body is provided with a stirring system and a spraying system, and the tank body has two tanks, i.e., an A tank and a B tank. The A tank is provided with a first material inlet and a first overflow port at the upper portion, and the B tank is provided with a second material inlet at the upper portion and a second material outlet at the lower portion. The first overflow port of the A tank is connected to the second material inlet of the B tank. The slurry from a double-shaft mixer enters the A tank first, then enters the B tank through overflow, and then enters a first pipeline through the second material outlet of the B tank. The insoluble large particles can be effectively prevented from entering the pipeline, so that the pipeline is prevented from being blocked by the large particles.

Description

Technical Field

[0001] This invention relates to the field of fly ash treatment, and more specifically to fly ash treatment equipment. Background Technology

[0002] When treating fly ash with water, it is inevitable that large, insoluble particles will appear in the slurry. Most existing dissolving tanks have top feed and bottom discharge. If the slurry contains large, insoluble particles, it is easy for these particles to enter the pipeline and cause blockage. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-unit dissolving tank to solve the above-mentioned technical problems.

[0004] Another objective of this invention is to provide a fly ash pre-dissolving system employing a dual-unit dissolving tank.

[0005] The technical problem solved by this invention can be achieved by the following technical solutions:

[0006] A dual dissolving tank, comprising a tank body, wherein the tank body is equipped with a stirring system and a spraying system, characterized in that the tank body consists of two tanks, namely tank A and tank B;

[0007] The upper part of tank A has a first material inlet and a first overflow outlet, and the upper part of tank B has a second material inlet and the lower part has a second material outlet.

[0008] The first overflow port of tank A is connected to the second material inlet of tank B.

[0009] In use, the slurry from the twin-shaft mixer first enters tank A, then overflows into tank B, and finally enters the first pipe through the second material outlet of tank B. This effectively prevents large, insoluble particles from entering the pipe, thus avoiding blockages caused by large particles.

[0010] The spray system includes nozzles located within the tank, with the overflow outlet lower than the height of the nozzles. This prevents the slurry from submerging the nozzles, contaminating or clogging them.

[0011] The mixing system includes a mixing shaft with mixing blades mounted on it. The material outlet is located on the lower side wall of the tank. Preferably, the height of the material outlet is equal to the height of the lowest mixing blade. This allows the material to be discharged from the tank more easily under the centrifugal force of the mixing blades.

[0012] A fly ash pre-dissolving system employing a double-unit dissolving tank includes a fly ash storage bin, a disc feeder, a conveyor belt, and a twin-shaft mixer. Its distinguishing feature is that it further includes a double-unit dissolving tank, through which materials sequentially pass: fly ash storage bin, disc feeder, conveyor belt, twin-shaft mixer, and double-unit dissolving tank. Attached Figure Description

[0013] Figure 1 This is a partial structural diagram of a double-unit dissolving tank;

[0014] Figure 2 This is a schematic diagram of a double-unit dissolving tank.

[0015] Figure 3 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0017] Reference Figure 1 , Figure 2 The dual-unit dissolving tank comprises two tanks, A (tank 10) and B (tank 11). Tank A (tank 10) has a first material inlet and an overflow outlet (overflow outlet 2) at its upper part. The height of the overflow outlet 2 is preferably lower than the height of the first material inlet. Tank B (tank 11) has a second material inlet (overflow outlet 3) at its upper part and a second material outlet (overflow outlet 4) at its lower part. The overflow outlet 2 of Tank A (tank 10) connects to the material inlet of Tank B (tank 11). During operation, the slurry from the twin-shaft mixer first enters Tank A (tank 10), then overflows into Tank B (tank 11), and finally enters the pipeline through the second material outlet 4 of Tank B (tank 11). This effectively prevents large, insoluble particles from entering the pipeline, thus avoiding blockages caused by large particles.

[0018] Reference Figure 3 The fly ash pre-dissolving system employing a double-unit dissolving tank includes a fly ash storage bin 15, a disc feeder 14, a conveyor belt 13, a twin-shaft mixer 12, and a double-unit dissolving tank. The material passes sequentially through the fly ash storage bin 15, disc feeder 14, conveyor belt 13, twin-shaft mixer 12, and double-unit dissolving tank. Preferably, there are two fly ash storage bins 15, serving as backups for each other and used alternately. Each fly ash storage bin 15 has a fly ash inlet, a fly ash outlet, and a compressed air inlet, which is connected to an air storage tank 16 via a pipeline. The disc feeder 14 is located below the fly ash outlet. The disc feeder 14 activates the fly ash and transfers it to the next device. The disc feeder 14 is located above the conveyor belt 13. The conveyor belt 13 is preferably a weighing conveyor belt, allowing for real-time weighing of the fly ash during transport. The conveyor belt feeds the fly ash into a twin-shaft mixer, where the fly ash and filtrate are mixed to ensure thorough agitation and dissolution of the fly ash, thereby reducing large insoluble particles. The resulting slurry is then sent to a twin dissolving tank for further processing.

[0019] Regarding the sprinkler system

[0020] The spraying system includes nozzles 5 located inside the tank. The overflow port 2 is lower than the height of the nozzles 5 to prevent slurry from submerging the nozzles 5 and contaminating or clogging them. Preferably, the spraying system includes a connecting cylinder comprising a tubular inner tube, a tubular outer tube, a top end connected to the top, and a bottom end connected to the bottom. The inner tube, outer tube, top end, and bottom end form a hollow cavity. A nozzle 5 is fixed to the bottom end, and the channel inside the nozzle 5 communicates with the hollow cavity. An inlet is provided on the top end, connected to the pump outlet via a third pipe. The bottom end of the connecting cylinder is fixed to the top of the tank. A nozzle insertion hole is provided on the top of the tank, through which the nozzle 5 extends into the tank. There are at least four nozzles 5, evenly spaced. This facilitates the placement of the stirring shaft and reduces mutual interference between the stirring shaft and the nozzles 5. A solenoid valve is provided on the third pipe; the fly ash pre-dissolving system using a dual-unit dissolving tank can control the solenoid valve to make the nozzles operate intermittently. This intermittent spraying of the washing liquid by the spraying system allows time for overflow and agitation, preventing the washing liquid from impacting the slurry and causing turbidity. This reduces the probability of large particles of impurities in the slurry entering tank B 11 through the overflow port. Preferably, in the fly ash pre-dissolving system using a dual-dissolving tank, while the spraying system sprays the washing liquid, the agitator shaft of the agitator rotates, and the overflow port of tank A 10 is closed. Conversely, when the spraying system of the fly ash pre-dissolving system using a dual-dissolving tank is not spraying the washing liquid, the overflow port of tank A 10 is open. A solenoid valve can be installed at the overflow port to control its opening and closing.

[0021] Regarding the mixing system

[0022] The mixing system 6 includes a mixing shaft with mixing blades mounted on it. The material outlet is located on the lower side wall of the tank. Preferably, the height of the material outlet is equal to the height of the lowest mixing blade. This allows the material to be discharged more easily from the tank under the centrifugal force of the mixing blades. The upper part of the tank is preferably cylindrical, and the lower part is preferably conical, meaning the inner diameter of the tank remains constant from top to bottom and then gradually decreases. A filter screen is provided at the junction of the upper and lower parts of the tank, thereby dividing the space inside the tank into upper and lower parts. There are at least two mixing blades, one above the filter screen and the other below it. Large particles, broken up by the upper mixing blade, pass through the filter screen and enter the lower part of the tank, where they are further dispersed by the secondary action of the lower mixing blade. Larger particles, blocked by the filter screen, cannot enter the lower part of the tank, but are located in the middle of the tank and are more easily dispersed by the combined action of the upper and lower mixing blades and the filter screen, ultimately resulting in better washing effect and higher efficiency of the present invention. Furthermore, this structure allows for different materials and numbers of the stirring blades. Preferably, the stirring blades above the filter screen have fewer blades than those below the filter screen. More preferably, the stirring system 6 also includes a drive motor connected to the stirring shaft via a coupling, with the lower part of the drive motor inserted into the inner tube. This utilizes the inner tube to limit the drive motor, reducing its noise. More importantly, the liquid within the hollow cavity and the motor can exchange heat through the inner tube, lowering the motor's temperature while raising the temperature of the liquid within the hollow cavity.

[0023] Tank A 10 has a first slag discharge port 7 at its bottom, allowing large, insoluble particles to be discharged. The first slag discharge port 7 is connected to a second pipe. Tank B 11 has a second slag discharge port 8 at its bottom, allowing impurities inside the tank to be discharged. The second material outlet 4 is connected to the first pipe, and the second slag discharge port 8 is also connected to the first pipe.

[0024] The double dissolving tank also includes a pump 9, whose inlet is connected to the first pipeline, and whose outlet can be connected to the first material inlet or connected to the next process.

[0025] Solenoid valves are installed at the second material outlet 4, the first slag discharge port 7, and the second slag discharge port 8, allowing control of the opening and closing status of each port. The discharge sequence can be controlled by sequentially opening and closing the second material outlet 4 and the second slag discharge port 8, thereby using the discharge from the second material outlet 4 to flush the pipeline and prevent blockage of the pipeline by the discharge from the second slag discharge port 8. Preferably, the height of the second material outlet 4 is higher than the height of the second slag discharge port 8.

[0026] A damping system is also installed at the outlet of pump 9 to reduce pipeline vibration. A three-way valve can also be installed at the inlet of pump 9, with one port connected to the inlet of pump 9, one port connected to the first pipeline, and the remaining port connected to the replenishment tank 1. This allows for the replenishment of rinsing liquid from the replenishment tank, thereby improving the cleanliness of the liquid entering tanks A 10 and B 11. Preferably, a heating element is installed on the side wall or bottom of the replenishment tank to heat the liquid entering the tank, thereby increasing the temperature of the washing solution, accelerating the reaction rate within the tank, and improving the washing effect.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A duplex dissolving tank comprising a tank body, said tank body being provided with a stirring system, a spraying system, characterized in that, The tank body has two, namely A tank and B tank; The upper part of the A tank is provided with a first material inlet and a first overflow port, and the upper part of the B tank is provided with a second material inlet and the lower part is provided with a second material outlet; The first overflow port of the A tank is connected with the second material inlet of the B tank, and the second material outlet is connected with a first pipeline; The slurry first enters the A tank, then enters the B tank through overflow, and then enters the first pipeline through the second material outlet of the B tank; The spraying system comprises a connecting cylinder, the connecting cylinder comprises an inner tube in the shape of a pipe, an outer tube in the shape of a pipe, a top end connected to the top, a bottom end connected to the bottom, the inner tube, the outer tube, the top end and the bottom end surround a hollow cavity, a nozzle is fixed on the bottom end, a channel in the nozzle is communicated with the hollow cavity, the nozzle is located in the tank body, the height of the overflow port is lower than the height of the nozzle, a liquid inlet is formed on the top end, the liquid inlet is connected with the water outlet of the pump through a third pipeline, an electromagnetic valve is arranged on the third pipeline, the fly ash pre-dissolution system of the double-dissolution tank is controlled by the electromagnetic valve to make the nozzle work intermittently; The stirring system comprises a stirring shaft, the stirring shaft is provided with stirring blades, the second material outlet is located on the lower part of the side wall of the tank body, and the height of the second material outlet is equal to the height of the lowermost stirring blade; The upper part of the tank body is in the shape of a cylinder, the lower part of the tank body is in the shape of a cone, a filter screen is arranged at the junction of the upper part and the lower part of the tank body, and the stirring blades are at least two, one of which is located above the filter screen and the other of which is located below the filter screen.

2. The duplex dissolving tank of claim 1, wherein The nozzle has at least four, and each nozzle is arranged at equal intervals.

3. The duplex dissolving tank of claim 1, wherein The bottom of the B tank is provided with a second slag discharge port, and the second slag discharge port is also connected to the first pipeline.

4. The duplex dissolving tank of claim 1, wherein The pump is further arranged, the water inlet of the pump is connected with the first pipeline, and the water outlet of the pump is connected with the first material inlet.

5. The duplex dissolving tank of claim 4, wherein A three-way valve is arranged at the water inlet of the pump, one port of the three-way valve is connected with the water inlet of the pump, one port is connected with the first pipeline, and the remaining port is connected with a liquid supplement tank.

6. A fly ash pre-dissolution system using double connection dissolving tank, including fly ash storage bin, disc feeder, conveying belt, double shaft mixer, characterized in that, The double-dissolution tank of any one of claims 1-5 is further arranged, and the material sequentially passes through a fly ash storage bin, a disc feeder, a conveying belt, a double-shaft mixer and the double-dissolution tank.

7. The fly ash pre-solution system employing dual solution tank according to claim 6, characterized in that, The fly ash storage bin has two, and the fly ash storage bin is provided with a fly ash inlet, a fly ash outlet and a compressed air inlet.

8. The fly ash pre-solution system employing dual solution tank of claim 6, wherein, The conveying belt is a conveying belt with a weighing function.

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