Automatic dosing device for flocculant storage tank

Abstract

The utility model discloses an automatic dosing device for a flocculating agent storage tank, which comprises a flocculating agent dry powder box and a three-cavity preparation box connected with a liquid level meter, an outlet of the flocculating agent dry powder box is connected with a screw feeder, the three-cavity preparation box comprises a first cavity, a second cavity and a third cavity which are communicated, and the first cavity, the second cavity and the third cavity are communicated with each other. A stirrer is arranged in each cavity, a funnel is arranged between a discharge port of the spiral feeder and an inlet of the first cavity, the upper end of the first cavity is connected with a waterway pipeline, the funnel is connected to the waterway pipeline through a pipeline with a stop valve, and the bottom of the three-cavity preparation box is connected with a discharge pipeline with a stop valve. The right end of the medicine outlet pipeline is connected with a delivery pipe network, and the automatic preparation device has the technical characteristics that the flocculating agent can be uniformly added, caking is avoided, the concentration is adjustable, the manual intervention degree is reduced, the medicine is not wasted, the labor cost and the maintenance workload are reduced, the automatic preparation of the flocculating agent is realized, and the like.

Description

Technical Field

[0001] The utility model relates to a dosing device, more specifically, to an automatic dosing device for a flocculant storage tank, belonging to the field of petrochemical industry. Background Art

[0002] At present, the flocculant preparation in the coal chemical industry is done manually and with temporary tools. The specific situation is as follows: the company purchases flocculants in 25kg small woven bags, which are packed on wooden pallets, with one pallet of 1 ton for overall packaging and transportation. After being transported to the site, the manufacturer prepares the flocculants. During preparation, the on-site personnel use temporary tools to pour the flocculants into the flocculant tank. The flocculant tank is designed with an agitator to prevent the flocculant from being fully dissolved in the tank due to the addition speed being too fast, and eventually coagulating into flocculant blocks in the tank. Some large blocks float on the top of the flocculant tank, and small blocks will settle at the bottom of the flocculant tank. When the liquid level of the flocculant tank drops to about 20% of the liquid level, the coagulated large blocks of flocculants will be sucked into the inlet pipeline of the flocculant pump, which will eventually block the flocculant pump pipeline and cause the flocculant pump to fail to work.

[0003] The main component of flocculant is polyacrylamide. The main function of adding flocculant to the system is to accelerate the coagulation of fine ash in the clarification tank, thereby accelerating the sedimentation of particles. If the flocculant is added too quickly or unevenly, it will cause incomplete dissolution of the flocculant, and eventually form large lumps in the tank, which will cause a series of problems as follows:

[0004] 1. The flocculant forms insoluble lumps in the tank. When the liquid level of the flocculant tank drops to a low level, it will block the pump inlet pipeline or the inlet check valve, requiring shutdown for maintenance, resulting in production interruption and increased maintenance tasks, increasing production costs.

[0005] 2. Manual operation is very unstable, the addition amount and speed are unstable, and the addition cost is high.

[0006] 3. Adding to form large lumps will cause waste of pharmaceutical resources.

[0007] 4. If any large insoluble chunks are found, they need to be manually fished out from the top of the tank. This is because the main component of the flocculant is polyacrylamide, which becomes very smooth after dissolving in water and is extremely difficult to salvage. It is time-consuming and laborious. In addition, if they are not handled properly after being fished out, people may slip and fall, posing a safety hazard. Utility Model Content

[0008] In order to solve the above-mentioned problems of the prior art, the utility model provides an automatic dosing device for a flocculant storage tank, which has the technical characteristics of being able to achieve uniform addition of flocculant, no agglomeration, adjustable concentration, reduced manual intervention, no waste of reagents, reduced labor costs and maintenance workload, and automatic preparation of flocculants.

[0009] In order to achieve the above purpose, the utility model is implemented by the following technical solutions:

[0010] A flocculant storage tank automatic dosing device comprises a flocculant dry powder box, the outlet of the flocculant dry powder box is connected to a screw feeder, and also comprises a three-chamber preparation box connected to a liquid level meter, the three-chamber preparation box comprises a connected chamber No. 1, a chamber No. 2, and a chamber No. 3, each chamber is provided with a stirrer, a funnel is provided between the discharge port of the screw feeder and the inlet of the chamber No. 1, the upper end of the chamber No. 1 is connected to a water pipeline, the funnel is connected to the water pipeline through a pipeline with a stop valve, the bottom of the three-chamber preparation box is connected to a discharge pipeline with a stop valve, the discharge pipeline is connected to a drug discharge pipeline, and the right end of the drug discharge pipeline is connected to an external delivery pipeline network.

[0011] Preferably, a group of baffles is provided between adjacent chambers, and each group of baffles includes baffle No. 1 7 and baffle No. 2 8, the upper end of baffle No. 1 is connected to the top of the three-cavity preparation box and a gap is left between its lower end and the bottom of the three-cavity preparation box, the lower end of baffle No. 2 is connected to the bottom of the three-cavity preparation box and a gap is left between its upper end and the top of the three-cavity preparation box, and a channel is formed between baffle No. 1 and baffle No. 2 to achieve communication between adjacent chambers.

[0012] Preferably, the upper end of the flocculant dry powder box is connected to an exhaust pipeline, and the exhaust pipeline is connected to a vacuum feeding pump and a plurality of regulating valves.

[0013] Preferably, an exhaust hole is opened at the top of the flocculant dry powder box, and a suction hole is opened on the side of the flocculant dry powder box. The vacuum feeding pump draws air outward through the exhaust hole to form a vacuum in the flocculant dry powder box. The suction hole is connected to the external dry powder through a hose for feeding the dry powder into the flocculant dry powder box.

[0014] Preferably, a high and low material level sensor is provided in the flocculant dry powder box.

[0015] Preferably, the flocculant dry powder box is also connected to an air source pipeline for purging the inside of the flocculant dry powder box.

[0016] Preferably, the bottoms of the No. 1 chamber, the No. 2 chamber and the No. 3 chamber are respectively connected to a discharge pipeline, an overflow pipeline with a stop valve is extended from the left end of the medicine outlet pipeline, and an overflow discharge port is provided at the end of the overflow pipeline.

[0017] Preferably, the water pipeline is provided with a regulating valve, a pressure gauge, a pneumatic ball valve, an electromagnetic flow meter, a dirt collector, a water flow sensor detector and a plurality of stop valves.

[0018] Preferably, the external delivery pipeline network includes at least two branch pipelines, and at least two stop valves are connected to the branch pipelines, and the outlet ends of the branch pipelines are connected together.

[0019] Preferably, a controller is further included, each valve is an electric valve, and the high and low material level sensors, liquid level meter, screw feeder, electromagnetic flow meter, dirt collector, water flow sensor detector, vacuum feeding pump, agitator and each valve are electrically connected to the controller;

[0020] The controller is a DCS control system or a PLC controller.

[0021] Beneficial effects: Polyacrylamide is toxic. When pouring medicine manually, the tiny dust particles raised can easily enter the human respiratory system. Long-term work will cause harm to the human body. This application can protect the health of operators and prevent operators from direct contact with medicine powder. The vacuum feeding system ensures that the process of dry powder from bag to box is completely closed; the concentration of flocculant preparation is controllable, the concentration of prepared medicine is uniform, and the instability of medicine addition is reduced; a fully automatic dispensing device can be realized, which reduces the formation of lumps during medicine preparation, reduces the blockage of delivery pumps and pipelines, and saves manual labor during medicine preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0024] like Figure 1 The figure shows a specific embodiment of an automatic dosing device for a flocculant storage tank, which is an automatic dosing device for a flocculant storage tank, including a flocculant dry powder box 1, the outlet of the flocculant dry powder box 1 is connected to a screw feeder 2, and also includes a three-chamber preparation box connected to a liquid level meter, the three-chamber preparation box includes a connected chamber No. 1, a chamber No. 2, and a chamber No. 3, each of which is provided with a stirrer, a funnel 3 is provided between the discharge port of the screw feeder 2 and the inlet of the chamber No. 1, the upper end of the chamber No. 1 is connected to a water pipeline 4, the funnel 3 is connected to the water pipeline 4 through a pipeline with a stop valve, the bottom of the three-chamber preparation box is connected to a discharge pipeline 5 with a stop valve, the discharge pipeline 5 is connected to a drug discharge pipeline, and the right end of the drug discharge pipeline is connected to an external delivery pipeline network 6.

[0025] A group of baffles is provided between adjacent chambers, and each group of baffles includes baffle No. 1 7 and baffle No. 2 8. The upper end of baffle No. 1 7 is connected to the top of the three-cavity preparation box and a gap is left between its lower end and the bottom of the three-cavity preparation box. The lower end of baffle No. 2 8 is connected to the bottom of the three-cavity preparation box and a gap is left between its upper end and the top of the three-cavity preparation box. A channel is formed between baffle No. 1 7 and baffle No. 2 8 to achieve communication between adjacent chambers.

[0026] The upper end of the flocculant dry powder box 1 is connected to an exhaust pipeline, and the exhaust pipeline is connected to a vacuum feeding pump 9 and multiple regulating valves, such as a pneumatic butterfly valve. The exhaust pipeline, the suction hole and the extension structure constitute a vacuum feeding system, which is mainly equipped with a vacuum suction bin, a suction fan, a pneumatic butterfly valve, an air bag, an air filter, a pulse valve, an air compressor, and a suction pipe. The top of the flocculant dry powder box 1 is provided with an exhaust hole, and the side of the flocculant dry powder box 1 is provided with a suction hole. The vacuum feeding pump 9 exhausts air outward through the exhaust hole to form a vacuum in the flocculant dry powder box 1. The suction hole is connected to the dry powder outside through a hose for feeding the dry powder into the flocculant dry powder box 1. The flocculant dry powder box 1 is provided with a high and low material level sensor. The flocculant dry powder box 1 is also connected to an air source pipeline 10 for purging the inside of the flocculant dry powder box 1. The bottom of the No. 1 chamber, the No. 2 chamber, and the No. 3 chamber are respectively connected to a discharge pipeline 5, and an overflow pipeline 11 with a stop valve is extended from the left end of the medicine discharge pipeline, and an overflow discharge port is provided at the end of the overflow pipeline 11. The water pipeline 4 is provided with a regulating valve, a pressure gauge, a pneumatic ball valve, an electromagnetic flowmeter, a dirt collector, a water flow sensor detector, and multiple stop valves.

[0027] The external delivery pipeline network 6 includes at least two branch pipelines, and at least two stop valves are connected to the branch pipelines, and the outlet ends of the branch pipelines are connected together.

[0028] It also includes a controller, and each valve is an electric valve. The high and low material level sensors, liquid level meter, screw feeder 2, electromagnetic flowmeter, dirt collector, water flow sensor detector, vacuum feeding pump 9, agitator and each valve are electrically connected to the controller; using follow-up technology, the flowmeter detects the water flow in real time, and sends it to the DCS and PLC in the form of 4-20mA current signal. The DCS or PLC calculates the current feeding amount according to the real-time flow. Regardless of how the water flow changes, corresponding adjustments can be made at any time to ensure the accuracy and stability of flocculant preparation. The controller is a DCS control system or a PLC controller. The DCS control system is based on a microprocessor and adopts a new generation of instrument control system with decentralized control functions, centralized display operations, and a design principle that takes into account both division and autonomy and comprehensive coordination. It belongs to the prior art and is not specifically limited in this application.

[0029] Operation mode: The controller operates the electrical components and equipment. Specifically, the vacuum feeding pump 9 is used to feed the 25 kg bagged flocculant transported into the flocculant dry powder box. The specific feeding principle is: the vacuum feeding pump 9 draws air outward through the suction pipe at the top of the dry powder box to form a vacuum in the flocculant dry powder box 1. The suction holes on the side of the flocculant dry powder box 1 can generate sufficient suction. The vacuum feeding pump 9 and the corresponding valves are closed, and the suction holes are opened. The dry powder enters the flocculant dry powder box 1 through the hose connected to the suction holes, and the dry powder falls to the bottom of the flocculant dry powder box 1. A high and low level switch is set in the flocculant dry powder box 1. When the dry powder reaches the low level, the controller is notified to control the feeding. When the dry powder reaches the high level, the dosing is stopped. After the drug application is completed, the pneumatic butterfly valve between the flocculant dry powder box 1 and the vacuum feeding pump 9 is closed, and the air source pipeline 10 is opened at the same time to backflush the flocculant dry powder box 1 to ensure the cleanliness of the filter screen in the flocculant dry powder box 1.

[0030] The reagent is weighed and sent to the three-chamber preparation box by an automatic screw feeder. Before entering the three-chamber preparation box, the reagent needs to be pre-wetted through the water pipeline 4 (the specific pre-wetting method can be: through a jet mixer. During operation, the water flow ejected from the top of the jet mixer forms a rotating water film, and the dry powder falls from the upper end onto the water film and rotates and falls with the water film. In this process, it is ensured that each powder particle of the powdered flocculant will be wetted, and the reagent is easy to fully mature during the next stirring stage), ensuring the atomization and mixing effect of the reagent and preventing the reagent from agglomerating. The amount of reagent added and the amount of water inlet are controlled by the central control by DCS or by the on-site PLC. For example, by setting the water inlet flow rate, the flow rate of the screw feeder can be adjusted according to the water inlet flow rate for feeding after the flow rate is set. A remote level gauge and an on-site level gauge are provided on the three-chamber preparation box. The normal working state is between high and low liquid levels. When the liquid level reaches the low level, the controller can open the water inlet pneumatic ball valve and the screw feeder at the same time to ensure the concentration of the prepared liquid. When the liquid level is high, the controller will close the water inlet electric ball valve and the screw feeder. When an abnormal situation occurs, the extremely low liquid level will act, and the controller will stop the operation and send out an alarm signal.

[0031] The flocculant dry powder box 1 is a storage tank with a length of 4.5 meters, a width of 4.5 meters and a height of 5.2 meters, which is used for preparing and storing flocculants. The capacity of the flocculant tank can be designed according to the amount of production equipment and the size of the reserve. The material of the flocculant tank is 304L.

[0032] The three-chamber preparation box is made of 304 stainless steel as a whole, and consists of three boxes (i.e., chamber No. 1, chamber No. 2, and chamber No. 3), namely, the preparation box, the maturation box, and the dosing box. Each box is separated by an overflow weir plate (i.e., a group of baffles), so that the liquid flows from the water inlet to the drug outlet by gravity. Each chamber is provided with a separate drug discharge valve and an overflow discharge port.

[0033] A preferred method: when adding solid powder flocculant, the flocculant can be quantitatively added into the dispensing box through a heatable dry powder hopper (funnel 3 with a heating resistor) and a spiral metering (conveying spiral blade). The spiral feeding and heating can further prevent the flocculant from caking and blocking the conveying pipeline.

[0034] The three-chamber preparation box is equipped with a differential pressure remote level gauge and a magnetic flap level gauge to display the liquid level on site, and output a 4-20mA liquid level signal to the DCS system or PLC controller, which can provide real-time feedback on the liquid level status of the three-chamber preparation box, and can set the values ​​of the high liquid level, low liquid level, and alarm liquid level. The normal working state is between the high and low liquid levels. When the liquid level reaches the low level, the water inlet pneumatic ball valve is opened, and the screw feeder is turned on at the same time. The operation of the screw feeder is controlled by the DCS system or PLC controller, which can realize automatic frequency conversion control of the output of the medicine according to the preparation concentration of the medicine. This mode of operation can well ensure the concentration of the prepared medicine. Of course, the technology of this application does not rely on the setting of the program. The main scheme lies in the structure, and the functions of each component also rely on the functions possessed by the device.

[0035] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. An automatic dosing device for a flocculant storage tank, characterized in that: The invention comprises a flocculant dry powder box (1), the outlet of which is connected to a screw feeder (2), and a three-chamber preparation box connected to a liquid level meter, wherein the three-chamber preparation box comprises a first chamber, a second chamber, and a third chamber which are connected to each other, and each chamber is provided with a stirrer. A funnel (3) is provided between the outlet of the screw feeder (2) and the inlet of the first chamber, the upper end of the first chamber is connected to a water pipeline (4), and the funnel (3) is connected to the water pipeline (4) through a pipeline with a stop valve. The bottom of the three-chamber preparation box is connected to a discharge pipeline (5) with a stop valve, and the discharge pipeline (5) is connected to a drug discharge pipeline, and the right end of the drug discharge pipeline is connected to an external delivery pipeline network (6).

2. The automatic dosing device for flocculant storage tank according to claim 1, characterized in that: A group of baffles is arranged between adjacent chambers, each group of baffles comprises a first baffle (7) and a second baffle (8), the upper end of the first baffle (7) is connected to the top of the three-chamber preparation box and a gap is left between its lower end and the bottom of the three-chamber preparation box, the lower end of the second baffle (8) is connected to the bottom of the three-chamber preparation box and a gap is left between its upper end and the top of the three-chamber preparation box, and a channel is formed between the first baffle (7) and the second baffle (8) to achieve communication between adjacent chambers.

3. The automatic dosing device for flocculant storage tank according to claim 1, characterized in that: The upper end of the flocculant dry powder box (1) is connected to an exhaust pipeline, and the exhaust pipeline is connected to a vacuum feeding pump (9) and a plurality of regulating valves.

4. The automatic dosing device for flocculant storage tank according to claim 3 is characterized by: The flocculant dry powder box (1) has an exhaust hole at the top and a suction hole at the side of the flocculant dry powder box (1). The vacuum feeding pump (9) draws air outward through the exhaust hole to form a vacuum in the flocculant dry powder box (1). The suction hole is connected to the dry powder in the outside through a hose to feed the dry powder into the flocculant dry powder box (1).

5. The automatic dosing device for flocculant storage tank according to claim 4, characterized in that: The flocculant dry powder box (1) is provided with a high and low material level sensor.

6. The automatic dosing device for flocculant storage tank according to claim 1, characterized in that: The flocculant dry powder box (1) is also connected to an air source pipeline (10) for purging the interior of the flocculant dry powder box (1).

7. The automatic dosing device for flocculant storage tank according to claim 1, characterized in that: The bottoms of the No. 1 chamber, the No. 2 chamber, and the No. 3 chamber are respectively connected to a discharge pipeline (5), an overflow pipeline (11) with a stop valve extends from the left end of the medicine outlet pipeline, and an overflow discharge port is provided at the end of the overflow pipeline (11).

8. The automatic dosing device for flocculant storage tank according to claim 5, characterized in that: The water pipeline (4) is provided with a regulating valve, a pressure gauge, a pneumatic ball valve, an electromagnetic flow meter, a dirt collector, a water flow induction detector and a plurality of stop valves.

9. The automatic dosing device for flocculant storage tank according to claim 1, characterized in that: The external delivery pipeline network (6) comprises at least two branch pipelines, the branch pipelines are connected to at least two stop valves, and the outlet ends of the branch pipelines are connected together.

10. The automatic dosing device for flocculant storage tank according to claim 8, characterized in that: It also includes a controller, each valve is an electric valve, and the high and low material level sensors, liquid level meter, screw feeder (2), electromagnetic flow meter, dirt collector, water flow sensor detector, vacuum feeding pump (9), stirrer and each valve are electrically connected to the controller; The controller is a DCS control system or a PLC controller.

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