Flocculation dosing system device for dewatering dredged sediment and control method

Abstract

The invention provides a flocculation dosing system device for dewatering dredged sediment and a control method, the system device comprises a metering unit and a mixing unit which are sequentially arranged on a sludge inlet pipeline, and the metering unit is connected with a central control unit; the mixing unit is provided with a sampling port, the sampling port is connected with the granularity detection unit, and the granularity detection unit is connected with the central control unit; the central control unit is connected with the dosing control unit, and a material outlet of the dosing control unit is connected with the mixing unit. According to the system device and the control method, starting from particle size characteristics, automatic dosing of the flocculating agent and dynamic adjustment of the dosing amount are carried out by taking the particle size of the flocculating body as a main regulation and control parameter, and accurate control of the dosing amount of the flocculating agent is realized, so that the optimal bottom mud dehydration effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of dredging, and relates to a flocculation and dosing system device and a control method for dredged sludge dewatering treatment. Background Art

[0002] In large-scale dredging or silt removal projects, the existing sediment conditioning and mechanical dehydration process is mainly based on artificial addition of reagents. This method relies on subjective experience to adjust the dosage through the state of flocculation alum flowers, so this method has a large error. In order to improve related problems, new methods or systems for dosing control have been continuously reported in recent years, such as CN1715201A, CN115108617A, CN114545985A, CN118307109A and other patents. However, its control technology often relies on changes in flow and concentration indicators to adjust the dosage. The input mud moisture content is volatile. When the moisture content of the feed sludge changes greatly, there is a problem of not being able to respond in time, which leads to hysteresis in sediment conditioning, large errors in conditioning effects, low precision, and poor subsequent dehydration effects. The moisture content of the mud cake produced is often lower than expected, which increases the cost of reagents and affects the efficiency of the project.

[0003] In order to solve the lag of the past experience in regulating the dosage of flocculants, CN118221240A and others reported the use of imaging technology to monitor the flocs by taking real-time images of the flocs, and to achieve the regulation of the dosage of the flocculants. However, this method is susceptible to interference from accidental factors. The flocs are mostly irregular spheres. Different shooting angles will lead to large differences in the actual results. When the flocs in motion overlap, errors caused by misjudgment are also prone to occur, and precise regulation cannot be achieved. Therefore, it is urgent to develop a more stable and efficient control method to achieve precise dosing control of sludge dewatering treatment, thereby avoiding problems such as high construction costs and long cycles caused by incorrect dosage, and improving the production efficiency and automation level of mud dewatering treatment. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a flocculation dosing system device and a control method for dredged sludge dewatering treatment. Dredged sludge particles have the characteristics of a wide range of particle size distribution, large differences in sludge particle sizes, and a large number of fine particles and coarse particles. Therefore, the system device and control method start from the particle size characteristics, use the flocculant particle size as the main control parameter to automatically add flocculants and dynamically adjust the dosage, so as to achieve precise control of the flocculant dosage, so as to achieve the best sludge dewatering effect.

[0005] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0006] One of the purposes of the present invention is to provide a flocculation and dosing system device for dredged sludge dewatering treatment, the system device comprises a metering unit and a mixing unit arranged in sequence on a sludge inlet pipeline, the metering unit is connected to a central control unit;

[0007] The mixing unit is provided with a sampling port, the sampling port is connected to the particle size detection unit, and the particle size detection unit is connected to the central control unit;

[0008] The central control unit is connected to the dosing control unit, and the material outlet of the dosing control unit is connected to the mixing unit.

[0009] As a preferred technical solution of the present invention, the metering unit includes a concentration meter and a flow meter.

[0010] The second object of the present invention is to provide a flocculation dosing control method for dredged sludge dewatering treatment, the system method comprising:

[0011] Detecting the basic properties of the sludge entering the mixing tank unit, performing a first regulation on the dosage of the flocculant according to the detection result of the basic properties of the sludge, and regulating the dosage of the flocculant according to the first regulation result;

[0012] The floc particle size distribution of the mixing unit is detected, and the dosage of the flocculant is second-controlled according to the detection result of the floc particle size distribution, and the dosage of the flocculant is controlled according to the second control result.

[0013] As a preferred technical solution of the present invention, the basic properties of the sediment include the concentration and flow rate of the sediment.

[0014] As a preferred technical solution of the present invention, the metering unit is used to detect the concentration and flow of the bottom mud.

[0015] As a preferred technical solution of the present invention, the mixing unit is used to mix the sludge and the flocculation agent.

[0016] As a preferred technical solution of the present invention, the particle size detection unit is used to detect the floc particle size distribution in the mixing unit.

[0017] As a preferred technical solution of the present invention, the central control unit is used to receive the test results of the metering unit and the particle size detection unit, and obtain the control result of the dosage of the flocculant according to the test results;

[0018] The dosing control unit adjusts the dosage of the flocculant according to the control result obtained by the central control unit.

[0019] As a preferred technical solution of the present invention, the particle size detection unit detects the characteristic particle size D of the flocs. 10 , D 50 , D 90, the central control unit obtains the control result of the dosage of the flocculant through the calculation result of formula 1;

[0020]

[0021] As a preferred technical solution of the present invention, when the result of formula 1 is X≥2.0×10 -2 , indicating that the flocculent particle size distribution is highly discrete, and the control result is the rapid addition of flocculants; when the result calculated by formula 1 is 10 -2 <X<2.0×10 -2 When X≤0.9×10 -2 When , the control result is to stop adding flocculant.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] The present invention provides a flocculation and dosing system device and a control method for dredged sludge dewatering treatment. Dredged sludge particles have the characteristics of a wide range of particle size distribution, large differences in sludge particle sizes, and the presence of a large number of fine particles and coarse particles. The system device and control method provided by the present invention start with the particle size characteristics, and use the flocculent particle size distribution characteristics as the key quality control parameters to automatically add flocculants and dynamically adjust the dosage, thereby achieving precise control of the flocculant dosage, solving the hysteresis problem of existing regulation technologies represented by the concentration method, and the problem that the regulation accuracy is limited by the volatility of the raw materials. At the same time, it solves the problems of error and interference of existing regulation technologies represented by the image method, thereby achieving a better sludge dewatering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a flocculation and dosing system device for dredged sludge dewatering treatment provided in the specific implementation mode of the present invention;

[0025] Figure 2 This is a data diagram of the particle size distribution of dredged mud before and after the dosing regulation in Example 6 of the present invention.

[0026] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0027] The technical solution of the present application is further described below through specific implementation methods.

[0028] The specific embodiment of the present invention provides a flocculation and dosing system device for dredged mud dewatering treatment, the system device includes a metering unit and a mixing unit arranged in sequence on a mud inlet pipeline, and the metering unit is connected to a central control unit;

[0029] The mixing unit is provided with a sampling port, the sampling port is connected to the particle size detection unit, and the particle size detection unit is connected to the central control unit;

[0030] The central control unit is connected to the dosing control unit, and the material outlet of the dosing control unit is connected to the mixing unit.

[0031] In a specific embodiment of the present invention, the sample is sampled by pumping, and the sample is transported from the sampling port to the particle size detection unit connected to the sampling port.

[0032] In a specific embodiment of the present invention, the metering unit includes a concentration meter and a flow meter.

[0033] In a specific embodiment of the present invention, in addition to the concentration meter and the flow meter, the metering unit may also be provided with other detectors to further detect the sediment, such as a turbidity meter, a density meter, etc.

[0034] In a specific embodiment of the present invention, the metering unit and the central control unit may be electrically connected, and the detection result is transmitted to the central control unit in the form of an electrical signal.

[0035] In a specific embodiment of the present invention, the particle size detection unit and the central control unit may be electrically connected, and the detection result is transmitted to the central control unit in the form of an electrical signal.

[0036] In a specific embodiment of the present invention, the particle size detection unit may be a particle size analyzer.

[0037] In a specific embodiment of the present invention, the central control system can be a conventional control device, such as a computer, etc. The central control system is preferably provided with an artificial intelligence component, which optimizes and learns the test results of the metering unit and the particle size detection unit and the relationship between the test results and the flocculant dosage, thereby realizing full automatic adjustment and intelligent flocculation control of the dosage of the agent to achieve the best effect.

[0038] In a specific embodiment of the present invention, the central control system and the dosing control unit may be electrically connected, and the control result is transmitted to the dosing control unit by means of an electrical signal.

[0039] In a specific embodiment of the present invention, the dosing control unit can set up multiple storage devices in parallel, each storage device is independently provided with a dosing pipeline, and each storage device adds different flocculant components. The central control unit can give the control results of suitable flocculants (or combinations) and their corresponding dosages to achieve the optimal effect.

[0040] In a specific embodiment of the present invention, a dosing control unit can be provided with a multi-partition storage device, each partition space is not interconnected, and different flocculant components are added to each partition, and the addition of flocculants is achieved through the same dosing pipeline. The central control unit can give the control results of suitable flocculants (or combinations) and their corresponding dosages to achieve the optimal effect.

[0041] In a specific embodiment of the present invention, the mud outlet of the mixing unit is connected to a dewatering unit to achieve dewatering of the bottom mud, such as a mechanical dewatering device.

[0042] The specific embodiment of the present invention provides a flocculation dosing control method for dredged sludge dewatering treatment, the system method comprising:

[0043] Testing the basic properties of the sludge before entering the mixing unit, performing a first regulation on the dosage of the flocculant according to the test results of the basic properties of the sludge, and regulating the dosage of the flocculant according to the first regulation results;

[0044] The floc particle size distribution of the mixing unit is detected, and the dosage of the flocculant is secondarily regulated according to the detection result of the floc particle size distribution, and the dosage of the flocculant is regulated according to the second regulation result.

[0045] In the present invention, the basic properties of the sludge before entering the mixing unit are detected, and the dosage of the flocculant is first regulated according to the detection results of the basic properties of the sludge, and the dosage of the flocculant is second regulated according to the detection results of the floc particle size distribution. The first regulation is to determine the initial addition amount of the flocculant, and the second regulation is to correct the addition amount of the flocculant.

[0046] In a specific embodiment of the present invention, the flocculant particle size is used as the main control parameter to automatically add the flocculant and dynamically adjust the dosage. The principle is to use a laser particle size online monitor to monitor the flocculation process in real time. The particle size distribution concentration is used as the control signal, and D 10 , D 50 , D 90 These three characteristic particle sizes are specifically By setting The permitted range is used as the dynamic adjustment criterion.

[0047] In a specific embodiment of the present invention, the dosage of the flocculant is regulated according to the first regulation result. The flocculant discharge valve is set to three speed adjustment gears, and the first regulation adopts medium speed operation; after the first regulation is started, the floc particle size distribution detection of the mixing unit is started, and the dosage of the flocculant is regulated according to the detection result of the floc particle size distribution. According to the second regulation result, when the floc particle size is This indicates that the floc particle size distribution is highly discrete and the flocculant discharge valve is adjusted to fast operation; when the floc particle size range is When the flocculant discharge valve is adjusted to slow operation; when the floc particle size range is Stop adding medicine.

[0048] In a specific embodiment of the present invention, the basic properties of the sludge include the concentration and flow rate of the sludge, but are not limited to the above properties. Other basic properties of the sludge that have an impact on the dosage of the flocculant can be used for the first regulation.

[0049] In a specific embodiment of the present invention, the metering unit is used to detect the concentration and flow rate of the bottom mud. However, when the metering unit is also provided with other detection timers, it can also be used to detect other properties of the bottom mud.

[0050] In a specific embodiment of the present invention, the mixing unit is used to mix the bottom mud and the flocculating agent to perform flocculation treatment on the bottom mud, so as to facilitate the subsequent dehydration treatment of the bottom mud.

[0051] In a specific embodiment of the present invention, the particle size detection unit is used to detect the floc particle size distribution in the mixing unit. Part of the sample in the mixing unit is sent to the particle size detection unit through the sampling outlet provided in the mixing unit to detect the floc particle size distribution, and the detection result is fed back to the central control unit.

[0052] In a specific embodiment of the present invention, the central control unit is used to receive the test results of the metering unit and the particle size detection unit, and obtain the control result of the dosage of the flocculant according to the test results. The central control unit is provided with hardware and software for constructing a mathematical model of the relationship between the concentration, flow rate and floc particle size distribution of the sediment and the dosage of the flocculant.

[0053] In a specific embodiment of the present invention, the central control unit may also include an artificial intelligence component, which is used to optimize and learn the concentration, flow rate and flocculant particle size distribution, and their relationship with the flocculant dosage, so as to achieve fully automatic adjustment and intelligent flocculation control of the dosage of the agent.

[0054] In a specific embodiment of the present invention, the dosing control unit adjusts the dosage of the flocculant according to the control result obtained by the central control unit.

[0055] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0056] Example 1

[0057] This embodiment provides a flocculation and dosing system device for dredged sludge dewatering treatment, the system device includes a metering unit and a mixing unit arranged in sequence on a sludge inlet pipeline, the sludge outlet of the mixing unit is connected to the dewatering unit, the metering unit is connected to the central control unit, and the metering unit includes a concentration meter and a flow meter;

[0058] The mixing unit is provided with a sampling port, the sampling port is connected to the particle size detection unit, and the particle size detection unit is connected to the central control unit;

[0059] The central control unit is connected to the dosing control unit, and the material outlet of the dosing control unit is connected to the mixing unit.

[0060] Example 2

[0061] This embodiment provides a flocculation and dosing system device for dredged sludge dewatering treatment, and its structure is as follows: Figure 1 As shown, the system device includes:

[0062] The system device comprises a metering tank 1 and a mixing tank 2 which are arranged in sequence on the mud inlet pipeline, the mud outlet of the mixing tank 2 is connected to the dehydration unit 6, the metering tank 1 is electrically connected to the central control unit 3, and the metering tank 1 comprises a concentration meter and a flow meter;

[0063] The mixing tank 2 is provided with a sampling port, the sampling port is connected to the particle size analyzer 4, and the particle size analyzer 4 is electrically connected to the central control unit 3;

[0064] The central control unit 3 is connected to the dosing control unit 5 , and the material outlet of the dosing control unit 5 is connected to the mixing tank 2 .

[0065] Example 3

[0066] This embodiment provides a flocculation dosing control method for dredged sludge dewatering treatment, the system method uses the system device provided in Example 2, and the system method includes:

[0067] The concentration meter and flow meter of the metering tank 1 are used to detect the concentration and flow rate of the bottom mud before entering the mixing tank 2, and the detection results are fed back to the central control unit 3. The central control unit 3 performs a first regulation on the dosage of the flocculant according to the detection results of the concentration and flow rate of the bottom mud. The central control unit 3 feeds back the first regulation to the dosing control unit 5. The dosing control unit 5 regulates the dosage of the flocculant according to the first regulation result;

[0068] The mixing tank 2 is provided with a sampling port, and the sample is transported from the sampling port to the particle size analyzer 4 by means of pumping, and the floc particle size distribution inside the mixing unit is detected, and the detection result is fed back to the central control unit 3. The central control unit 3 performs a second regulation on the dosage of the flocculant according to the detection result of the floc particle size distribution. The central control unit 3 feeds back the second regulation to the dosing control unit 5, and the dosing control unit 5 adjusts the dosage of the flocculant according to the second regulation result.

[0069] Example 4

[0070] This embodiment provides a flocculation and dosing system device for dredged sludge dewatering treatment. Except that the central control unit 3 is provided with an artificial intelligence component, the other conditions of the dosing device are the same as those of Example 2.

[0071] Example 5

[0072] The present embodiment provides a flocculation and dosing control method for dredged sludge dewatering treatment. The system method uses the system device provided in Example 4. The system method is the same as Example 3. The artificial intelligence component in the central control unit 3 in the present embodiment can also dynamically learn the detection results of the concentration meter and flow meter in the metering tank 1 and the particle size analyzer 4, as well as the control results given by the central control unit 3, that is, the dosage of the flocculant, thereby optimizing the control instructions, so as to improve the dosing accuracy of the flocculant.

[0073] Example 6

[0074] This embodiment provides a flocculation dosing control method for dredged sludge dewatering treatment, the system method uses the system device provided in Example 2, and the system method includes:

[0075] The concentration meter and flow meter of the metering tank 1 are used to detect the concentration and flow rate of the bottom mud before entering the mixing tank 2, and the detection results are fed back to the central control unit 3. The central control unit 3 performs a first regulation on the dosage of the flocculant according to the detection results of the concentration and flow rate of the bottom mud. The central control unit 3 feeds back the first regulation to the dosing control unit 5. The dosing control unit 5 regulates the dosage of the flocculant according to the first regulation result; the flocculant discharge valve is set to three gears of speed regulation, and the first regulation adopts medium speed operation;

[0076] The mixing tank 2 is provided with a sampling port, and the sample is transported from the sampling port to the particle size analyzer 4 by means of pump suction, and the floc particle size distribution inside the mixing unit is detected, and the detection result is fed back to the central control unit 3. The central control unit 3 performs a second regulation on the dosage of the flocculant according to the detection result of the floc particle size distribution, and the central control unit 3 feeds back the second regulation to the dosing control unit 5. This indicates that the floc particle size distribution is highly discrete, and the flocculant discharge valve is adjusted to high speed operation; when the floc particle size range is When the flocculant discharge valve is adjusted to slow operation; when The dosing is finished when the dosing is finished. The particle size distribution data of the dredged sediment before and after the dosing is shown in the figure below. Figure 2 shown.

[0077] The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed structural features, that is, it does not mean that the present invention must rely on the above-mentioned detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0078] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0080] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A flocculation and dosing system device for dredged sludge dewatering treatment, characterized in that: The system device comprises a metering unit and a mixing unit which are sequentially arranged on the mud inlet pipeline, and the metering unit is connected to the central control unit; The mixing unit is provided with a sampling port, the sampling port is connected to a particle size detection unit, and the particle size detection unit is connected to the central control unit; The central control unit is connected to the dosing control unit, and the material outlet of the dosing control unit is connected to the mixing unit.

2. The flocculation and dosing system device according to claim 1 is characterized in that: The metering unit includes a concentration meter and a flow meter.

3. A flocculation dosing control method for dredged sludge dewatering treatment, characterized in that: The system method includes: Detecting the basic properties of the sludge entering the mixing tank unit, performing a first regulation on the dosage of the flocculant according to the detection result of the basic properties of the sludge, and regulating the dosage of the flocculant according to the first regulation result; The floc particle size distribution of the mixing unit is detected, and the dosage of the flocculant is second-controlled according to the detection result of the floc particle size distribution, and the dosage of the flocculant is further controlled according to the second control result.

4. The flocculation dosing control method according to claim 3, characterized in that: The basic properties of the sediment include the concentration and flow of the sediment.

5. The flocculation dosing control method according to claim 3, characterized in that: The metering unit is used to detect the concentration and flow rate of the bottom mud.

6. The flocculation dosing control method according to claim 3, characterized in that: The mixing unit is used for mixing the bottom mud and the flocculant.

7. The flocculation dosing control method according to claim 3, characterized in that: The particle size detection unit is used to detect the floc particle size distribution in the mixing unit.

8. The flocculation dosing control method according to claim 3, characterized in that: The central control unit is used to receive the test results of the metering unit and the particle size detection unit, and obtain the control result of the dosage of the flocculant according to the test results; The dosing control unit adjusts the dosage of the flocculant according to the control result obtained by the central control unit.

9. The flocculation dosing control method according to claim 8, characterized in that: The particle size detection unit detects the characteristic particle size D of the flocs. 10 , D 50 , D 90 The central control unit obtains the control result of the dosage of the flocculant through the calculation result of formula 1; 10. The flocculation dosing control method according to claim 9, characterized in that: When the result of the calculation of formula 1 is X≥2.0×10 -2 , indicating that the flocculent particle size distribution is highly discrete, and the control result is the rapid addition of flocculants; when the result calculated by formula 1 is 10 -2 <X<2.0×10 -2 When the result of the regulation is to add the flocculating agent slowly; when the result of the calculation of formula 1 is X≤0.9×10 -2 When the amount of the flocculating agent is less than 0.05, the control result is to stop adding the flocculating agent.

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