Automatically controlled dosing device and dosing system

Abstract

The utility model discloses an automatic control dosing device and dosing system, including kettle body, the inside of kettle body is provided with the sieve plate, the sieve plate is located the upper part of kettle body close to kettle body feed inlet, powder enters the kettle body from kettle body feed inlet, the powder is screened through the sieve plate, the lower part of kettle body is provided with the quantitative screw propeller, and the quantitative screw propeller is provided with the quantitative screw propeller. According to the automatic control dosing device provided by the utility model, the screen plate and the stirrer are arranged to screen and stir the added activated carbon powder, so that the particle coagulum in the powder is reduced, and meanwhile, the loose degree of the dephosphorization agent powder in the feeding process is ensured; and an arch plug caused by powder accumulation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an automatically controlled chemical dosing device and a chemical dosing system. Background Technique

[0002] Urban sewage treatment is a key link in reducing nitrogen and phosphorus loads and controlling water eutrophication. After many sewage treatment plants in China have achieved the first-class A standard operation, they have explored and implemented discharge standards that can reach the surface water quality, and extending the treatment process and using chemical agents have become the mainstream choices. For example, the use of chemical phosphorus removal agents not only effectively removes residual phosphates in sewage, but also brings adverse effects such as increased operating costs, increased sludge production, and reduced biological phosphorus removal activity. Therefore, on the one hand, it is necessary to study more efficient biological treatment processes, and on the other hand, it is necessary to optimize the control of existing process processes.

[0003] The phosphorus removal agent is generally iron salt or aluminum salt, etc. By adding chemical agents, phosphate ions in water form insoluble salts, and then phosphorus is removed from sewage by solid-liquid separation methods. The new phosphorus removal agent in this article is a new phosphorus removal material (nano-micron high-purity composite active iron), which is a new type of solid insoluble dry powder phosphorus removal agent, and is an active powder material with developed micro-pores. The pores belong to the nano-micron level and have strong reaction activity. When added to the biochemical pool, it will be wrapped by activated sludge and move and diffuse with the sludge movement, and then fill the entire biochemical pool system, slowly releasing and playing a phosphorus removal role. The main phosphorus removal mechanisms include active adsorption, chemical precipitation, biological catalysis and other mechanisms, and have homogeneous coprecipitation, realizing high-efficiency phosphorus removal.

[0004] At present, in engineering applications, there is still a lack of simple and feasible technologies and equipment. It is necessary to combine operation experience and theoretical analysis to solve problems such as excessive dosing damaging biological phosphorus removal activity and poor quality of the agent resulting in insufficient dosing. The traditional extensive operation management control system is prone to problems such as insufficient or excessive dosing of phosphorus removal agents. Excessive dosing not only causes huge waste of resources, but also leads to problems such as increased sludge production and high effluent color. Therefore, it is necessary to carry out refined management of deep phosphorus removal in sewage treatment. Content of the Utility Model

[0005] To solve the above technical problems, the utility model provides an automatically controlled chemical dosing device, which includes a kettle body. A sieve plate is arranged in the kettle body, and the sieve plate is located near the feed inlet of the kettle body at the upper part of the kettle body. The powder enters the kettle body from the feed inlet of the kettle body, and the powder is screened by the sieve plate.

[0006] Preferably: A quantitative screw propeller is arranged below the kettle body, and the stirred powder enters the quantitative screw propeller from the discharge outlet of the kettle body.

[0007] Preferably, an outer edge of the sieve plate is fixedly connected to a fixing ring, and the fixing ring is fixedly connected to the kettle body.

[0008] Preferably, a through hole is provided in the middle of the sieve plate corresponding to the mixer.

[0009] Preferably, a spring support is fixedly connected to the lower end of the kettle body, and the spring support is installed on the bracket.

[0010] Preferably, at least one kettle body feed port is provided at the upper end of the kettle body.

[0011] Preferably, a mixer is further installed on the kettle body, and the mixer includes a motor and a stirring paddle.

[0012] Preferably, a kettle body discharge port is provided at the bottom end of the kettle body, and a cut-off valve is provided on the kettle body discharge port.

[0013] A chemical dosing system includes the above-mentioned automatically controlled chemical dosing device.

[0014] Preferably, the chemical dosing system further includes a biological pond, a secondary sedimentation tank and an effluent tank. Sewage is discharged after passing through the biological pond, the secondary sedimentation tank and the effluent tank in sequence through pipelines, and the automatically controlled chemical dosing device adds chemicals into the biological pond.

[0015] The technical effects and advantages of the present utility model:

[0016] The automatically controlled chemical dosing device provided by the present utility model screens and stirs the added activated carbon powder by arranging a sieve plate and a stirrer, reduces the particle condensates in the powder and ensures the looseness of the phosphorus remover powder during the feeding process, and avoids the formation of arch plugs due to powder accumulation. Description of the drawings

[0017] Figure 1 is a schematic structural diagram of the automatically controlled chemical dosing device provided by an embodiment of the present application;

[0018] Figure 2 is a top view of the automatically controlled chemical dosing device provided by an embodiment of the present application;

[0019] Figure 3 is the structure at Figure 1 at A in the automatically controlled chemical dosing device provided by an embodiment of the present application;

[0020] Figure 4 is a schematic structural diagram of the sieve plate in the automatically controlled chemical dosing device provided by an embodiment of the present application;

[0021] Figure 5 is a schematic structural diagram of the chemical dosing system provided by an embodiment of the present application.

[0022] In the figure: 100, kettle body; 110, kettle body feed inlet; 120, stirrer; 130, kettle body discharge outlet; 200, support; 300, spring support; 400, metering screw conveyor; 500, sieve plate; 510, fixing ring; 520, fixing piece; 530, through hole; 600, biological pond; 700, secondary sedimentation tank; 800, effluent tank; 900, PLC controller. Detailed implementation mode

[0023] The present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation modes. The embodiments of the present utility model are given for purposes of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

[0024] Please refer to Figures 1 - 2 As shown, in this embodiment, an automatically controlled chemical dosing device is provided, which includes a kettle body 100. The lower end of the kettle body 100 is fixedly connected to a spring support 300, and the spring support 300 is installed on a support 200. At least one kettle body feed inlet 110 is opened at the upper end of the kettle body 100. A stirrer 120 is also installed on the kettle body 100. The stirrer 120 includes a motor and a stirring paddle. A kettle body discharge outlet 130 is provided at the bottom end of the kettle body 100, and a cut-off valve is provided on the kettle body discharge outlet 130.

[0025] In this embodiment, a sieve plate 500 is arranged inside the kettle body 100. The sieve plate 500 is located near the kettle body feed inlet 110 at the upper part of the kettle body 100. The phosphorus removal agent powder enters the kettle body 100 from the kettle body feed inlet 110, and the powder is screened through the sieve plate 500 to effectively reduce the particle condensates in the powder. The phosphorus removal agent powder is stirred by the stirrer 120 to ensure the looseness during the feeding process and avoid powder accumulation and arching.

[0026] In this embodiment, a metering screw conveyor 400 is arranged below the kettle body 100. The stirred phosphorus removal agent powder enters the metering screw conveyor 400 from the kettle body discharge outlet 130, and the metering screw conveyor 400 is used to measure the feeding amount of the material.

[0027] In one embodiment, a vibration motor is also installed on the kettle body 100 to vibrate the storage hopper during the feeding process, reduce the adhesion of the powder on the side wall of the storage hopper, and achieve high-quality continuous feeding.

[0028] Refer to Figures 3 - 4As shown, the outer edge of the sieve plate 500 is fixedly connected to the fixing ring 510. The fixing ring 510 is fixed to the kettle body 100 through the fixing member 520. A through hole 530 is provided in the middle of the sieve plate 500 corresponding to the stirrer 120, so that the stirring paddle can pass through the through hole 530 and be connected to the motor.

[0029] In this embodiment, the fixing member 520 can be a bolt or a rivet.

[0030] In another embodiment, the fixing ring 510 can also be fixed to the kettle body 100 by welding.

[0031] In another embodiment, a chemical dosing system is provided, including the above-mentioned automatically controlled chemical dosing device. The automatically controlled chemical dosing device is connected to the PLC controller 900. It also includes a biological pool 600, a secondary sedimentation tank 700, and an effluent tank 800. The sewage is discharged after passing through the biological pool 600, the secondary sedimentation tank 700, and the effluent tank 800 in sequence through pipelines. The automatically controlled chemical dosing device adds a phosphorus removal agent into the biological pool 600, and the dosing amount per time can be set by adjusting the opening degree.

[0032] When controlling the dosing of the phosphorus removal agent, there are two superimposed processing methods: feedforward and feedback. When dosing the phosphorus removal agent, according to the feedforward reaction formula, the total dosing amount of the chemical phosphorus removal agent can be expressed as M1 = βQ (total phosphorus in the raw water - total phosphorus in the effluent of the biological pool - biological phosphorus removal amount), that is, M1 = βQ[(P1 - P2) - αP1] + A; where Q is the sewage treatment volume, m3 / d; P1 is the influent TP concentration, mg / L; P2 is the TP concentration in the effluent of the biological pool, mg / L, α is the biological phosphorus removal rate, obtained from the historical data of the sewage treatment plant, β is the dosing amount coefficient of the new phosphorus removal agent used for simultaneous chemical phosphorus removal, which can be obtained through beaker experiments, and A is the insurance dosing amount coefficient, formulated by the temperature meter installed on the biological pool and combined with the local sewage historical data.

[0033] On the basis of the feedforward reaction, this case synchronously adopts feedback control. When dosing with feedback, the dosing amount of the phosphorus removal agent M2 = γQ (total phosphorus in the effluent of the biological pool - target total phosphorus in the effluent), that is, M2 = γ(P2 - Px); where Q is the sewage treatment volume, m3 / d; P2 is the TP concentration in the effluent of the biological pool, mg / L; Px is the target TP concentration in the effluent, mg / L, and γ is the dosing amount coefficient of the new phosphorus removal agent used for post-treatment chemical phosphorus removal, which can be obtained through beaker experiments.

[0034] During dosing, the signal collectors at the inlet and outlet collect the signals of the total phosphorus concentration P1 at the inlet, the total phosphorus concentration P2 at the outlet of the biological tank, and the total phosphorus concentration P4 of the effluent. These signals are transmitted to the prediction system for the setting value of the chemical phosphorus removal agent dosage in the computer of the central control room through a data transmission radio. The measured values are compared with the given value of the TP concentration (the effluent TP setting value) to be maintained by the treatment unit in the PLC operation control regulator. Then, the result of the comparison is output as a control signal through the output module in the PLC controller, enabling the phosphorus removal agent dosing system to calculate the required amount of the phosphorus removal agent. The automatic dosing device adjusts the dosing amount according to the set adjustment method and the change of the TP load obtained from on-line monitoring.

[0035] Taking a certain sewage treatment plant as an example, the AAO treatment process is adopted, and the main phosphorus removal methods are biological phosphorus removal and simultaneous phosphorus removal. A new type of phosphorus removal agent is added at the front end of the aerobic tank for simultaneous phosphorus removal. Through historical data analysis, the biological phosphorus removal rate of the sewage treatment plant is 58.3%, that is, α is 0.583; through the beaker experiment data of the new type of phosphorus removal agent, the dosing coefficient for simultaneous phosphorus removal is 0.24, that is, β is 0.24; the dosing coefficient for post-treatment is 0.21, that is, γ is 0.21. The effluent of this sewage treatment plant meets the first-class A standard, and the total phosphorus discharge standard is 0.5 mg / L. The target value is set at 80% of the standard, that is, Px is 0.4. The safety factor A provided by the phosphorus removal agent manufacturer is 0.1. Therefore, when adding the phosphorus removal agent in the device of the present utility model, the amount of the phosphorus removal agent M to be added is M = M1 + M2 = βQ[(P1 - P2) - αP1] + A + γQ(P2 - Px) = Q(0.1008P1 - 0.03P2) + 0.016.

[0036] During feeding, a quantitative screw propeller is used by the feeder to accurately measure the feeding amount of the material. The PLC controller, according to the feeding ratio set by the process, applies quantitative / servo control technology. Based on the size of the treated water volume obtained through setting or communication, it controls the speed of the variable-frequency motor and synchronously adjusts the feeding amount of the material. The activated carbon material is transported to the feeding point through a screw conveyor, realizing a high-quality, continuous and stable feeding process.

[0037] The working principle of the present utility model is:

[0038] The novel dosing device for accurate automatic control of the new type of phosphorus removal agent provided by the present utility model screens and stirs the added activated carbon powder by setting a sieve plate and a stirrer, reducing the particle condensates in the powder and ensuring the looseness of the phosphorus removal agent powder during the feeding process, and avoiding the formation of arch plugs due to powder accumulation.

[0039] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art and related fields based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection of the present utility model. The structures, devices, and operation methods not specifically described and explained in the present utility model shall be implemented by conventional means in the art unless otherwise specified and limited.

Claims

1. An automatically controlled chemical dosing device, comprising a kettle body (100), characterized in that, A sieve plate (500) is arranged inside the kettle body (100). The sieve plate (500) is located near the kettle body feed inlet (110) at the upper part of the kettle body (100). The powder enters the kettle body (100) from the kettle body feed inlet (110), and the sieve plate (500) is used to screen the powder.

2. The automatic dosing device according to claim 1, characterized in that, A metering screw propeller (400) is arranged below the kettle body (100). The stirred powder enters the metering screw propeller (400) from the kettle body discharge outlet (130).

3. An automatic dosing device according to claim 1, characterized in that, The outer edge of the sieve plate (500) is fixedly connected with a fixing ring (510), and the fixing ring (510) is fixedly connected with the kettle body (100).

4. An automatic dosing device according to claim 3, wherein, A through hole (530) is provided in the middle of the sieve plate (500) corresponding to the mixer (120).

5. An automatic control chemical dosing device according to claim 1, characterized in that, The lower end of the kettle body (100) is fixedly connected with a spring support (300), and the spring support (300) is installed on the support (200).

6. The automatic dosing device according to claim 1, characterized in that, At least one kettle body feed inlet (110) is provided at the upper end of the kettle body (100).

7. The automatic dosing device according to claim 6, characterized in that, A mixer (120) is further installed on the kettle body (100). The mixer (120) includes a motor and a stirring paddle.

8. An automatic dosing device according to claim 7, characterized in that, A kettle body discharge outlet (130) is provided at the bottom end of the kettle body (100), and a cut-off valve is provided on the kettle body discharge outlet (130).

9. A drug addition system, characterized in that, It includes the automatic control chemical dosing device according to any one of claims 1-8.

10. A chemical dosing system according to claim 9, wherein, It further includes a biological pond (600), a secondary sedimentation tank (700) and an effluent tank (800). The sewage is discharged after passing through the biological pond (600), the secondary sedimentation tank (700) and the effluent tank (800) in sequence through pipelines, and the automatic control chemical dosing device adds chemicals into the biological pond (600).

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