Device and method for generating microbubbles and hydrates in situ by using visual kettle

Abstract

The invention discloses an experimental device and method for generating microbubbles and hydrates in situ by using a visual kettle, and belongs to the field of hydrate application. The device comprises a sintered ceramic perforated plate, a stainless steel visible kettle, a gas injection system, a liquid injection system, a temperature control system and the like. The method comprises the following steps: firstly, controlling the reaction kettle to be at a constant temperature, then injecting gas into the reaction kettle through the perforated plate at different flow rates, controlling the reaction kettle to be in a constant-pressure state through a back pressure valve, generating microbubbles in situ in the high-pressure reaction kettle by utilizing the perforated plate, and observing and recording the process of generating the microbubbles in the visible kettle by utilizing a CCD camera and a temperature and pressure sensor. The sizes and distribution of the microbubbles, the migration speed of the microbubbles and the like under different gas flow rates and different solution conditions can be obtained by processing images of the CCD camera. The influence of the microbubbles on hydrate nucleation under different conditions can be analyzed by processing collected temperature and pressure data in the kettle. The method is used for researching the physical properties of the microbubbles and the promotion effect of the microbubbles in the hydrate nucleation and growth process.

Description

technical field

[0001] The invention belongs to the field of hydrate application, and relates to an experimental device and method for generating microbubbles and hydrate in situ by using a visible kettle. Background technique

[0002] Due to their small size, microbubbles (bubbles with a diameter of 10-100μm) can show many characteristics different from ordinary bubbles, such as high mass transfer efficiency, long existence time, self-pressurization and dissolution, etc. According to the principle of buoyancy, the larger the volume of the bubble, the greater the buoyancy it receives, and the faster the rising speed. However, due to its small size, the buoyancy of the microbubble in the solution is much smaller than that of ordinary bubbles in water. Therefore, Microbubbles float slowly and stay in the water longer. According to the surface tension theory of the gas-liquid interface, the smaller the diameter of the bubble, the more obvious the influence of its surface tensi...

Examples

Embodiment 2

[0057] Example 2 Observation of microbubbles using a porous plate visual kettle

[0058] a. Initial preparation and injection stage

[0059] a1, turn on the cooling circulation pump 14 to reduce the temperature in the kettle to the experimental temperature of 20°C and the data acquisition system 7; configure the pure water of the experimental solution to the solution bottle, and saturate the injection pump 12 with the experimental solution;

[0060] a2. Open the needle valve v1 at the liquid inlet end, and turn on the liquid injection pump 12 to inject liquid at a fixed flow rate of 9.9 mL / min to the amount of solution required for the experiment;

[0061] a3. Close the needle valve v1 at the liquid inlet end, set the value of the back pressure valve 10 to 0MPa, open the needle valve v2 at the exhaust end, and draw a vacuum through the back pressure valve 10, and set the value of the back pressure valve 10 to the required value for the experiment after exhausting Pressure val...

Embodiment 3

[0071] Example 3 Data processing of the microbubble pictures collected by the camera

[0072] a. Add image scales in batches

[0073] a1. Open the macro recorder (Marcos) of ImageJ software;

[0074] a2, open the picture with scale, use the set scale function to add scale; close the macro recorder, get the macro file with scale added;

[0075] a3. Use the batch processing function (process-batch) to import the image sequence to be processed in batches; run the macro file to obtain the image sequence with scale;

[0076] b. Automatically count the bubble area

[0077] b1. Use process-sharpen or adjust-contrast to adjust the picture to make the picture clearer;

[0078] b2. Adjust the image threshold (adjust-threshold) to binarize the image;

[0079] b3. Use process-binary-fill holes to fill the gaps in the bubbles; use process-binary-watershed to automatically segment the bubble boundaries;

[0080] b4. Automatically count the bubble area through image analysis (analyze-pa...

Embodiment 4

[0086] Example 4 Formation of Hydrate in Visible Kettle Using Porous Plate

[0087] a. Initial preparation and injection stage

[0088] a1, turn on the cooling circulation pump 14 to reduce the temperature in the kettle to the experimental temperature of 1°C and the data acquisition system 7; configure the experimental solution 500ppm SDS solution to the solution bottle, and saturate the injection pump 12 with the experimental solution;

[0089] a2. Open the needle valve v1 at the liquid inlet end, and turn on the liquid injection pump 12 to inject liquid at a fixed flow rate of 9.9 mL / min to the amount of solution required for the experiment;

[0090] a3. Close the needle valve v1 at the liquid inlet end, set the value of the back pressure valve 10 to 0MPa, open the needle valve v2 at the exhaust end, and draw a vacuum through the back pressure valve 10, and set the value of the back pressure valve 10 to the required value for the experiment after exhausting The pressure val...

technical field

[0001] The invention belongs to the field of hydrate application, and relates to an experimental device and method for generating microbubbles and hydrate in situ by using a visible kettle. Background technique

[0002] Due to their small size, microbubbles (bubbles with a diameter of 10-100μm) can show many characteristics different from ordinary bubbles, such as high mass transfer efficiency, long existence time, self-pressurization and dissolution, etc. According to the principle of buoyancy, the larger the volume of the bubble, the greater the buoyancy it receives, and the faster the rising speed. However, due to its small size, the buoyancy of the microbubble in the solution is much smaller than that of ordinary bubbles in water. Therefore, Microbubbles float slowly and stay in the water longer. According to the surface tension theory of the gas-liquid interface, the smaller the diameter of the bubble, the more obvious the influence of its surface tensi...

Examples

Embodiment 2

[0057] Example 2 Observation of microbubbles using a porous plate visual kettle

[0058] a. Initial preparation and injection stage

[0059] a1, turn on the cooling circulation pump 14 to reduce the temperature in the kettle to the experimental temperature of 20°C and the data acquisition system 7; configure the pure water of the experimental solution to the solution bottle, and saturate the injection pump 12 with the experimental solution;

[0060] a2. Open the needle valve v1 at the liquid inlet end, and turn on the liquid injection pump 12 to inject liquid at a fixed flow rate of 9.9 mL / min to the amount of solution required for the experiment;

[0061] a3. Close the needle valve v1 at the liquid inlet end, set the value of the back pressure valve 10 to 0MPa, open the needle valve v2 at the exhaust end, and draw a vacuum through the back pressure valve 10, and set the value of the back pressure valve 10 to the required value for the experiment after exhausting Pressure val...

Embodiment 3

[0071] Example 3 Data processing of the microbubble pictures collected by the camera

[0072] a. Add image scales in batches

[0073] a1. Open the macro recorder (Marcos) of ImageJ software;

[0074] a2, open the picture with scale, use the set scale function to add scale; close the macro recorder, get the macro file with scale added;

[0075] a3. Use the batch processing function (process-batch) to import the image sequence to be processed in batches; run the macro file to obtain the image sequence with scale;

[0076] b. Automatically count the bubble area

[0077] b1. Use process-sharpen or adjust-contrast to adjust the picture to make the picture clearer;

[0078] b2. Adjust the image threshold (adjust-threshold) to binarize the image;

[0079] b3. Use process-binary-fill holes to fill the gaps in the bubbles; use process-binary-watershed to automatically segment the bubble boundaries;

[0080] b4. Automatically count the bubble area through image analysis (analyze-pa...

Embodiment 4

[0086] Example 4 Formation of Hydrate in Visible Kettle Using Porous Plate

[0087] a. Initial preparation and injection stage

[0088] a1, turn on the cooling circulation pump 14 to reduce the temperature in the kettle to the experimental temperature of 1°C and the data acquisition system 7; configure the experimental solution 500ppm SDS solution to the solution bottle, and saturate the injection pump 12 with the experimental solution;

[0089] a2. Open the needle valve v1 at the liquid inlet end, and turn on the liquid injection pump 12 to inject liquid at a fixed flow rate of 9.9 mL / min to the amount of solution required for the experiment;

[0090] a3. Close the needle valve v1 at the liquid inlet end, set the value of the back pressure valve 10 to 0MPa, open the needle valve v2 at the exhaust end, and draw a vacuum through the back pressure valve 10, and set the value of the back pressure valve 10 to the required value for the experiment after exhausting The pressure val...

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