Blockage detection system of nozzle structure disc type centrifugal machine

Abstract

The utility model discloses a blockage detection system of a nozzle structure disc type centrifugal machine. The blockage detection system comprises a rotary drum shell, a connector base, a feeding connector, a discharging connector and a slag discharging pipe. A feeding core pipe connected to the interior of the rotary drum is arranged in the connector base in a penetrating mode, a feeding connector is formed in the upper end of the feeding core pipe, a discharging connector is formed in one side of the connector base, and a slag discharging pipe is arranged on the lower portion of the rotary drum shell; a feeding pipe is connected to the feeding connector, a discharging pipe is connected to the discharging connector, a material inlet flow meter is arranged on the feeding pipe, and a material outlet flow meter is arranged on the discharging pipe. According to the material blocking detection system for the disc type centrifugal machine, the flow meters are designed at the material inlet and the clear liquid outlet, the material blocking condition of the nozzle structure disc type centrifugal machine is judged by comparing the flow values of the two flow meters, and the material blocking detection system can be used for calculating the concentration effect. In the application of actual production, the blockage condition of the butterfly centrifugal machine can be prevented, so that irreversible loss caused by unbalance of the rotary drum is avoided.

Description

Technical Field

[0001] This utility model relates to the field of disc centrifuge technology, specifically to a nozzle-structured disc centrifuge material blockage detection system. Background Technology

[0002] Disc centrifuges are fluid machinery devices that utilize the different centrifugal forces generated by immiscible mixtures with different densities to achieve physical separation of materials. The drum speed can reach over 10,000 r / min, and the drum diameter can range from over 1,000 mm. Therefore, they have a high separation factor and large production capacity. They can handle highly dispersed liquid-liquid emulsions and liquid-solid suspensions with very low solid-phase settling velocities, which are difficult to separate effectively by general centrifuges. They are widely used in industries such as chemical, pharmaceutical, petroleum, transportation, food, light industry, and bioengineering. Disc centrifuges come in many varieties. Based on the sludge discharge method, they can be divided into manual discharge, piston discharge, and nozzle discharge types. The drum shape of a disc centrifuge with a nozzle structure is conical to increase the volume of sludge storage and facilitate sludge discharge. During operation, sludge is continuously discharged through the nozzles, concentrating the suspension to a concentration rate of 5-30 times. To further improve the concentration rate, partial sludge recirculation can be used. This type of centrifuge is suitable for the separation and solid-phase concentration of emulsions with a solid phase concentration ≤10%. Generally, the nozzles for the light phase are located near the center of the drum, while the nozzles for the heavy phase are located near the edge of the drum, with 4-12 nozzles evenly distributed around the circumference. The production capacity and separation quality of the sludge discharged through the nozzles are related to the number of nozzles, orifice diameter, drum rotation speed, and equivalent settling area of ​​the discs. Smaller nozzle orifices can increase the concentration of discharged sludge, but small orifice diameters can easily lead to blockage by large particles in the sludge, causing drum imbalance and strong vibrations during production. Large nozzle orifices result in poor sludge concentration, affecting separation quality. Therefore, it is essential to select an appropriate number and orifice diameter of nozzles. However, in actual production, preventative measures should be taken to avoid drum imbalance and irreversible losses. Currently, however, there is no effective technical means to predict nozzle clogging in disc centrifuges.

[0003] In view of the above, it is necessary to propose a nozzle structure disc centrifuge material blockage detection system to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a nozzle structure disc centrifuge material blockage detection system.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A nozzle structure disc centrifuge clogging detection system includes a drum shell, a connector seat, a feed inlet, a discharge inlet, and a slag discharge pipe; the upper end of the drum shell is provided with a connector seat, and a feed core tube connected to the inside of the drum is provided through the connector seat. The upper end of the feed core tube forms a feed inlet, and a discharge inlet is provided on one side of the connector seat. A slag discharge pipe is provided at the lower part of the drum shell; a feed pipe is connected to the feed inlet, and a discharge pipe is connected to the discharge inlet. A material inlet flow meter is provided on the feed pipe, and a material outlet flow meter is provided on the discharge pipe.

[0006] Furthermore, the feed pipe is provided with a material branch pipe and a cleaning water inlet branch pipe. The material branch pipe is connected to the raw material liquid, and the cleaning water inlet branch pipe is connected to the cleaning water.

[0007] Furthermore, the discharge pipe is connected to a clear liquid branch pipe and a cleaning water outlet branch pipe, the clear liquid branch pipe being connected to the clear liquid outlet and the cleaning water outlet branch pipe being connected to the cleaning water outlet.

[0008] Furthermore, the material branch pipe, the cleaning water inlet branch pipe, the clear liquid branch pipe, and the cleaning water outlet branch pipe are all equipped with control valves for pipeline switching.

[0009] A method for detecting material blockage in a disc centrifuge with a nozzle structure involves collecting data from the material inlet flow meter to obtain the material feed flow rate, collecting data from the material outlet flow meter to obtain the clear liquid flow rate discharged from the centrifuge, calculating the difference between the real-time collected material feed flow rate and the clear liquid flow rate as the real-time flow difference, and comparing the real-time flow difference with the normal flow difference for judgment.

[0010] Furthermore, when the real-time flow rate of the clear liquid increases, the real-time flow difference decreases. If the real-time flow difference is less than the normal flow difference, then the nozzle is determined to be blocked.

[0011] Furthermore, if the calculated real-time flow difference is equal to the normal flow difference, then the nozzle is considered to be normal.

[0012] A method for calculating the concentration factor of a disc centrifuge with a nozzle structure includes the following steps:

[0013] S1: Determine the concentrate outlet flow rate:

[0014] Q 浓缩 =Q 进料 -Q 清液

[0015] In the formula: Q 浓缩 —Concentrate effluent flow rate; Q 进料 —Material feed flow rate; Q 清液 —Clear fluid flow rate;

[0016] S2: Determine the mass flow rate of a certain component in the stock solution:

[0017] M 进料 =Q 进料 ×C 进料

[0018] Where: M 进料 —Mass flow rate of a certain component in the feed concentrate; Q 进料 —Material feed flow rate; C 进料 —The concentration of a certain component;

[0019] S3: Determine the mass flow rate of a specific component in the concentrate:

[0020] M 浓缩 =Q 浓缩 ×C 浓缩

[0021] Where: M 浓缩 —Mass flow rate of a certain component in the concentrate; Q 浓缩 —Concentrate effluent flow rate; C 浓缩 —The concentration of a certain component in the concentrate;

[0022] S4: Due to material balance, the mass flow rate of a certain component in the raw solution is equal to the mass flow rate of a certain component in the concentrate.

[0023] M 浓缩 = M 进料

[0024] Determine the concentration of a certain component in the concentrate:

[0025]

[0026] S5: Calculate the concentration factor:

[0027]

[0028] In the formula: C 浓缩 —The concentration of a certain component in the concentrate; C 进料 —The concentration of a certain component.

[0029] The advantages and beneficial effects of this utility model are as follows: This utility model provides a clogging detection system for a nozzle-structure disc centrifuge. Flow meters are designed at both the material inlet and the clear liquid outlet. By comparing the flow rates of the two flow meters, the clogging situation of the nozzle-structure disc centrifuge can be determined, and the system can also be used to calculate the concentration effect. In practical production applications, it can prevent clogging in disc centrifuges, thereby avoiding irreversible losses caused by drum imbalance. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of a nozzle structure disc centrifuge material blockage detection system according to the present invention;

[0031] In the diagram: 1. Drum housing; 2. Connector seat; 3. Feed inlet; 4. Discharge inlet; 5. Slag discharge pipe; 6. Feed core tube; 8. Material inlet flow meter; 9. Material outlet flow meter; 10. Material branch pipe; 11. Cleaning water inlet branch pipe; 12. Raw material liquid; 13. Cleaning water; 14. Clear liquid branch pipe; 15. Cleaning water outlet branch pipe; 16. Clear liquid outlet; 17. Cleaning water outlet; 18. Control valve. Detailed Implementation

[0032] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0033] Example 1:

[0034] A nozzle-structure disc centrifuge blockage detection system, such as Figure 1 As shown, the system includes a drum shell 1, a connector seat 2, a feed inlet 3, a discharge inlet 4, and a slag discharge pipe 5. The upper end of the drum shell 1 is provided with the connector seat 2, through which a feed core tube 6 connects to the inside of the drum. The upper end of the feed core tube 6 forms the feed inlet 3. A discharge inlet 4 is provided on one side of the connector seat 2. The lower part of the drum shell 1 is provided with the slag discharge pipe 5. A feed pipe is connected to the feed inlet 3, and a discharge pipe is connected to the discharge inlet 4. A material inlet flow meter 8 is provided on the feed pipe, and a material outlet flow meter 9 is provided on the discharge pipe. The material inlet flow meter 8 detects the flow rate of the raw material liquid 12 entering the drum; the material outlet flow meter 9 detects the flow rate of the clear liquid exiting the drum.

[0035] Specifically, the feed pipe is equipped with a material branch pipe 10 and a cleaning water 13 inlet branch pipe 11. The material branch pipe 10 is connected to the raw material liquid 12, and the cleaning water 13 inlet branch pipe 11 is connected to the cleaning water 13. The discharge pipe is equipped with a clear liquid branch pipe 14 and a cleaning water 13 outlet branch pipe. The clear liquid branch pipe 14 is connected to the clear liquid outlet 16, and the cleaning water 13 outlet branch pipe is connected to the cleaning water 13 outlet. Each of the material branch pipe 10, the cleaning water 13 inlet branch pipe 11, the clear liquid branch pipe 14, and the cleaning water 13 outlet branch pipe is equipped with a control valve 18 for pipeline switching. In this embodiment, the material pipeline can be switched to the cleaning pipeline by switching the control valve 18. For example, when there is a blockage in the drum, the cleaning water 13 can be opened and enter the drum from the feed port 3. The cleaning water 13 can flush the inside of the drum and clean the pipeline of heavy materials when it flows out from the slag discharge pipe 5. The cleaning water 13 can also be used to clean the pipeline of light materials.

[0036] The working principle of this invention is as follows: The flow rate of the material entering the centrifuge can be obtained through the material inlet flow meter, and the flow rate of the clear liquid at the clear liquid outlet 16 can be obtained through the clear liquid outlet 16 flow meter. By comparing the two flow rates, if the difference between the two flow rates is consistent with the nozzle concentration ratio and orifice diameter selection (the nozzle orifice diameter and concentration ratio are fixed values ​​determined according to process requirements during design, and they determine the flow rate and concentration of the concentrate), that is, if the measured flow rate is consistent with the nozzle orifice diameter and concentration ratio, it indicates that the nozzle is not clogged. If the flow rate at the clear liquid outlet 16 is greater than the flow rate when the nozzle is not clogged, it can be concluded that the nozzle inside the centrifuge drum is clogged. This is to avoid severe clogging causing drum imbalance, which could lead to severe vibration of the entire machine and damage to the equipment. By comparing the material inlet flow rate and the clear liquid outlet 16 flow rate, the material concentration ratio can be obtained.

[0037] Example 2:

[0038] A method for detecting material blockage in a disc centrifuge with a nozzle structure involves collecting data from the material inlet flow meter 8 to obtain the material feed flow rate, collecting data from the material outlet flow meter 9 to obtain the clear liquid flow rate discharged from the centrifuge, calculating the difference between the real-time collected material feed flow rate and the clear liquid flow rate as the real-time flow difference, and comparing the real-time flow difference with the normal flow difference for judgment.

[0039] Furthermore, when the real-time flow rate of the clear liquid increases, the real-time flow difference decreases. If the real-time flow difference is less than the normal flow difference, then the nozzle is determined to be blocked.

[0040] Furthermore, if the calculated real-time flow difference is equal to the normal flow difference, then the nozzle is considered to be normal.

[0041] Specifically, the data for a disc centrifuge used to separate oil-water mixtures under normal conditions:

[0042] Feed flow rate: 100 L / min

[0043] Oil phase concentration of the original solution: 5% (mass fraction)

[0044] Clear liquid outlet flow rate: 90 L / min

[0045] Concentrate outlet flow rate: 10 L / min

[0046] Oil phase concentration of concentrate: 50% (mass fraction)

[0047] Nozzle orifice diameter: 1 mm

[0048] Calculation steps:

[0049] 1. Determine the mass flow rate of the oil phase in the original solution:

[0050] Oil phase mass flow rate in the raw solution = feed flow rate × oil phase concentration in the raw solution

[0051] The mass flow rate of the oil phase in the original solution = 100 L / min × 0.05 = 5 kg / min

[0052] 2. Determine the mass flow rate of the oil phase in the concentrate:

[0053] Oil phase mass flow rate in concentrate = concentrate flow rate × concentrate oil phase concentration

[0054] The oil phase mass flow rate in the concentrate = 10 L / min × 0.50 = 5 kg / min

[0055] 3. Calculate the concentration factor:

[0056] Concentration factor = Oil phase concentration in concentrate / Oil phase concentration in original solution

[0057] Concentration factor = 50% / 5% = 10

[0058] 4. Verify traffic balance:

[0059] Feed flow rate = Clear liquid outlet flow rate + Concentrate outlet flow rate

[0060] 100 L / min = 90 L / min + 10 L / min

[0061] Determine if the nozzle is clogged

[0062] Suppose that at a certain moment, the measured data is as follows:

[0063] Clear liquid outlet flow rate: 95 L / min

[0064] Concentrate outlet flow rate: 5 L / min

[0065] 1. Recalculate the concentration factor:

[0066] Oil phase mass flow rate in concentrate = concentrate flow rate × concentrate oil phase concentration

[0067] The oil phase mass flow rate in the concentrate = 5 L / min × 0.50 = 2.5 kg / min

[0068] 2. Verify traffic balance:

[0069] Feed flow rate = Clear liquid outlet flow rate + Concentrate outlet flow rate

[0070] 100 L / min = 95 L / min + 5 L / min

[0071] Determine if the nozzle is clogged:

[0072] Clear liquid outlet flow rate: 95 L / min, which is greater than the normal 90 L / min.

[0073] Concentrate outlet flow rate: 5 L / min, which is less than the normal 10 L / min.

[0074] If the flow rate of the clarified liquid outlet is greater than the normal flow rate, it indicates that the nozzle may be clogged, resulting in a reduction in the flow rate of the concentrate outlet.

[0075] The difference between the material feed flow rate and the clear liquid outlet flow rate: Under normal circumstances, this difference should be 10 L / min (100 L / min - 90 L / min).

[0076] Nozzle concentration ratio and orifice selection: The nozzle orifice and concentration ratio are determined during the design phase to ensure that the flow rate of the concentrate is 10 L / min and the concentration ratio is 10.

[0077] By comparing the measured flow rate of the clarified liquid outlet with the normal flow rate, it can be determined whether the nozzle is clogged. In this example, the clarified liquid outlet flow rate is 95 L / min, which is greater than the normal 90 L / min, while the concentrate outlet flow rate is 5 L / min, which is less than the normal 10 L / min. This indicates that the nozzle may be clogged and needs to be checked and cleaned.

[0078] Example 3:

[0079] A method for calculating the concentration ratio of a disc centrifuge with a nozzle structure, specifically, implementation data of a disc centrifuge used for separating oil-water mixtures:

[0080] Feed flow rate: Q 进料 =100 L / min

[0081] Oil phase concentration of the original solution: C 进料 =5% (mass fraction)

[0082] Clear liquid outlet flow rate: Q 清液 =90 L / min

[0083] Calculation steps

[0084] 1. Determine the concentrate outlet flow rate:

[0085] Q 浓缩 =Q 进料 -Q 清液 =100 L / min−90 L / min=10 L / min

[0086] 2. Determine the mass flow rate of the oil phase in the original solution:

[0087] M进料 =Q 进料 ×C 进料

[0088] M 进料 =100 L / min × 0.05 = 5 kg / min

[0089] 3. Determine the mass flow rate of the oil phase in the concentrate:

[0090] M 浓缩 = M 进料 =5 kg / min

[0091] 4. Determine the oil phase concentration in the concentrate:

[0092]

[0093] C 浓缩 = = 0.50 or 50%

[0094] 5. Calculate the concentration factor:

[0095] Concentration factor = = =10

[0096] Based on the above calculations, we obtained a concentration factor of 10. This means that the oil phase concentration in the concentrate discharged through the nozzle is 10 times that in the original solution.

[0097] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A clogging detection system for a disc centrifuge with a nozzle structure, comprising a drum shell, a connector seat, a feed inlet, a discharge inlet, and a slag discharge pipe; the upper end of the drum shell is provided with a connector seat, a feed core tube connecting to the inside of the drum is provided through the connector seat, the upper end of the feed core tube forms a feed inlet, a discharge inlet is provided on one side of the connector seat, and a slag discharge pipe is provided at the lower part of the drum shell; characterized in that, The feed port is connected to a feed pipe, and the discharge port is connected to a discharge pipe. The feed pipe is equipped with a material inlet flow meter, and the discharge pipe is equipped with a material outlet flow meter.

2. The nozzle structure disc centrifuge blockage detection system according to claim 1, characterized in that, The feed pipe is equipped with a material branch pipe and a cleaning water inlet branch pipe. The material branch pipe is connected to the raw material liquid, and the cleaning water inlet branch pipe is connected to the cleaning water.

3. The nozzle structure disc centrifuge blockage detection system according to claim 2, characterized in that, The discharge pipe is connected to a clear liquid branch pipe and a cleaning water outlet branch pipe. The clear liquid branch pipe is connected to the clear liquid outlet, and the cleaning water outlet branch pipe is connected to the cleaning water outlet.

4. The nozzle structure disc centrifuge blockage detection system according to claim 3, characterized in that, The material branch pipe, the cleaning water inlet branch pipe, the clear liquid branch pipe, and the cleaning water outlet branch pipe are all equipped with control valves for pipeline switching.

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