BOD5 analyzer

The BOD5 analyzer can simulate industrial sites, and in the laboratory, suitable temperatures for crude oil electric desalination (dehydration), types and amounts of demulsifiers, water injection volume, strength and time of electric field application can be found.

BOD5 analyzerIntroduction:

The instrument can simulate industrial sites, and in the laboratory, the temperature suitable for crude oil electric desalination (dehydration), the type and dosage of demulsifier, the amount of water injected, the strength and time of the applied electric field can be found.

BOD5 analyzerProduct features:

Equipped with a micro printer, it automatically prints relevant test data at the end of the experiment

◆ Equipped with overcurrent protection function, the overcurrent threshold can be set by oneself

◆ Can make 6 samples simultaneously

During the experiment, the sample chamber can be pressurized with nitrogen to prevent the evaporation of light oil and water vapor

◆ Equipped with forced cooling measures, it can cool down and release pressure within minutes

Technical parameters

Electric field voltage: 0~6000V, continuously adjustable heating temperature: room temperature~160 ℃

Time setting range: 1-200min overcurrent setting range: 1-80mA

Sample room working pressure ≤ 1Mpa

One Overview:

The JZ-PRPPJ demulsifier evaluation and electric dehydration performance tester is a new product developed by our factory based on years of experience in producing such instruments and drawing on the advantages of similar foreign products. It is suitable for the use of ultra heavy oil according to the actual needs of users. This instrument can simulate industrial sites and find the temperature and electric field strength suitable for crude oil electric desalination (dehydration) in the laboratory; Six types of demulsifiers can be selected simultaneously, or the same demulsifier can be used to select six different dosages. If used in conjunction with the LC-4 universal microcomputer coulomb analyzer, it can quantitatively analyze salts in crude oil.

Due to the use of microcontroller control, the performance of the instrument has been significantly improved. The LED display screen can simultaneously display temperature, current, high voltage, and test time, and achieve human-machine dialogue by inputting data and commands with a touch keyboard and microcontroller. The instrument is equipped with a micro printer, which automatically prints the test data at the end of the experiment. The instrument has overcurrent protection function, and the overcurrent threshold can be set by oneself. Both high and low voltage are controlled by solid-state relays, with no contacts or sparks. This instrument is a new generation of intelligent testing equipment for selecting demulsifiers and testing their electrical dehydration performance.

2、 Instrument working principle:

Crude oil contains a certain amount of water. During the mining and transportation process, oil and water form emulsions due to collisions, agitation, and friction. Meanwhile, in the process of crude oil desalination, water washing is mainly used to remove salts from the oil. Therefore, a certain amount of water must be injected first, and the oil and water must be fully mixed to form an emulsion. This emulsion exists in the form of oil in water or water in oil aggregates. Due to the fact that components such as gum and asphalt in crude oil are natural emulsifiers, they are less attracted by oil molecules and can be arranged at the oil-water interface to form a barrier. Therefore, emulsions are relatively stable and appropriate measures must be taken to break down, dehydrate, and desalinate (the process of electric desalination is essentially a dehydration process).

In order to improve dehydration efficiency, a small amount of demulsifier is often added during the dehydration process. For different varieties of demulsifiers and crude oils with different properties, it is necessary to select the most suitable demulsifier and appropriate dosage in order to achieve the goal of improving demulsification water.

The principle of selecting demulsifiers with this instrument is to first take a certain amount of crude oil, add a certain amount of water in proportion, stir vigorously to fully emulsify the oil and water, and then take 100ml each and pour it into six sample bottles. Then, a certain amount of demulsifier is sequentially added and heated appropriately to reduce the viscosity of the crude oil. In addition, a direct current high-voltage electric field is applied to exchange charges between small oil droplets and water droplets, achieving the purpose of oil-water separation. Then evaluate the quality of the demulsifier based on the amount of water poured or the amount of chloride ions in the water measured.

3、 Main technical indicators:

1. Input voltage: AC220V ± 10% 50HZ

2. Output voltage: DC0-6000V continuously adjustable

3. Rated power: 1200W

4. Temperature control range: Room temperature -160 ℃ (ultra heavy oil)

5. Temperature preset range for routine tests: room temperature -90 ℃ (conventional crude oil)

6. Current setting range: 1-80mA

7. Time setting range: 1-200 minutes

8. Environmental temperature: 0 ℃ -40 ℃

9. Relative humidity:<85%

10. Dimensions: 400mm × 420mm × 360mm (main unit)

400mm × 420mm × 800mm (auxiliary unit)

11. Weight: Approximately 60Kg

4、 Preparation work before installation

1. Connect the connecting wires of the main and auxiliary units of the instrument, connect the cooling water and check for water leakage, connect the nitrogen gas, and turn off the nitrogen gas.

2. Loosen the six locking screws on the heating element.

5、 Installation and use of instruments

1. The instrument belongs to high-voltage electrical equipment. To ensure safety, a three core power socket with a grounding terminal must be used, and its grounding performance must be reliable.

After the instrument is powered on, the high voltage window on the LED display screen shows the word "GOOD", indicating that the instrument self-test is normal. At this point, various parameters can be set through the keyboard.

(1) System time setting: In self-test mode, press the "Clock" button once to display the number "1" in the high-voltage display window and the corresponding month in the time display window. If you need to modify it, you can directly enter the desired value and press Enter. Press the "Clock" button continuously to display the month, day, hour, minute, and second in sequence. The remaining adjustment methods are the same as above. After setting, press the "Reset" button to return to the self-test state.

（2）. Working parameter setting: In self-test mode, press the "Temperature Setting" button, and the instrument will display the previously saved set values in the temperature display window. If this value needs to be modified, you can directly enter the new setting value and press Enter. The instrument displays' End ', indicating that the newly set parameters have been confirmed. Press the "Temperature Setting" button again, and the instrument will display "do", indicating that the power has been turned on and temperature control has started. If there is no need to modify the temperature parameters, you can press the "temperature setting" button twice in a row, and the instrument will directly enter the temperature control state, at which point the actual temperature value will be displayed. The overcurrent setting and working time setting are similar to temperature setting. It should be noted that when the parameters are set and the instrument displays "End", the "current (time) setting" button should not be connected again, otherwise it will enter the reset state. If the "current (time) setting" button is pressed, its parameters do not need to be modified. At this time, press the enter key again, and the instrument will display "End".

When the parameter settings are completed and the temperature has risen to the desired value, the experiment can begin. First, turn the high voltage adjustment knob counterclockwise to zero, press the "start" button, and the instrument will start timing. Then slowly adjust the high voltage adjustment knob to the desired value. If the "Start" button is pressed during the experiment, the time window will display "PAU". At this time, the instrument will cut off the high voltage and reset the timing value to zero. Press the "Start" button again, and the instrument will start timing again to start the experiment.

4. When the set time is up, the instrument automatically cuts off the high voltage and displays "stop" in the high voltage window and "End" in the time window, and the printer automatically prints the test data.

5. In self check mode, press the "High Voltage Test" button once to turn on the high voltage of the instrument. Press the button again to cut off the high voltage of the instrument, which can be used for testing the high voltage system before the experiment.

6. After starting up, if the high voltage adjustment knob has been set to zero and the high voltage display value is greater than 100V, it means that the power phase line and neutral line are connected in reverse and should be swapped.

6、 Test method

1. The following items should be prepared before the experiment:

a) One electric furnace;

b) One digital high shear emulsifier (randomly matched);

c) One liquid mixer (randomly matched);

d) Several 1000ml beakers, measuring cylinders, and pipettes each;

e) Several demulsifiers of different varieties and experimental crude oil;

f) Appropriate amount of transformer oil (put into 6 holes of heated aluminum bath to ensure uniform heat conduction);

g) An appropriate amount of kerosene cleaning agent.

2. Connect the instrument power and raise the temperature to the desired value.

3. Take 600ml of crude oil and put it into a container (when calculating the dehydration rate strictly, the water content of the crude oil itself should be measured first). Add distilled water at a ratio of 5%, heat it in an electric furnace to around 60-70 ℃, and then stir it at high speed in an emulsifier until the oil-water is fully emulsified.

4. Pour the emulsified crude oil into 6 100ml sample bottles, and determine the type and method of demulsifier to be added to each bottle according to different requirements for selecting demulsifiers. For example, one sample bottle does not contain a demulsifier, while the other five bottles are sequentially added with a certain concentration (usually 1%) of demulsifier 5ml, 10ml, 15ml, 20ml, 25ml, or equal amounts of demulsifier of different varieties are added to each of the six bottles. After adding the demulsifier, carefully screw the electrode bottle cap into the sample bottle and tighten it by hand.

5. Place the sample bottle containing the demulsifier into the liquid mixer and mix for about one minute, then slightly unscrew the electrode bottle cap.

6. Special reminder: When pressing the up or down button on the auxiliary unit, be sure to observe whether the 6 fixing screws are in the appropriate position and whether the locking pins under the 6 fixing screws are intact to avoid damaging the instrument. Press the up button on the auxiliary unit to activate the upper cover of the aluminum bath. Place the electrode bottle in the aluminum bath and heat it for about 5 minutes. Then, place the electrode and check if it is connected. Close the upper cover of the aluminum bath and press the down button. Tighten the six fixing screws. Open nitrogen and close the vent valve; When the pressure is about 5kg, turn off the nitrogen and open the vent valve. When the pressure is about 1kg, turn off the vent valve and open the nitrogen; When adding nitrogen at a pressure of about 5kg, close the nitrogen and open the vent valve. When adding nitrogen at a pressure of about 1kg, close the vent valve. When adding nitrogen at a pressure of 6kg, close the nitrogen before conducting the test.

7. Set the high voltage adjustment knob to zero, press the "start" button, slowly adjust the high voltage adjustment knob to increase the voltage, and observe the high voltage and current display values. The current value is generally controlled at about 1/2 of the set value. If it is too high, reduce the high voltage. If the current is too low, the high voltage should be increased accordingly. If it is still too low, the cathode electrode should be extended, and the length of the six cathode electrode pieces should be kept *.

When high voltage overcurrent occurs, the instrument will promptly cut off the high voltage circuit and sound an alarm, and the current window will display "Out". At this point, you can turn down the high voltage adjustment knob and press the "start" button twice in a row to continue the experiment. If the current setting is greater than or equal to 50mA and the high voltage can only be increased to a few hundred volts but still triggers an overcurrent alarm, it is necessary to check whether there is a short circuit between the electrodes (including a short circuit between the electrodes caused by too much moisture in the sample).

After the set time is reached, the instrument automatically cuts off the high voltage and prints the data, and the test ends. At this point, based on the water volume and salt content of the 6 sample bottles, the type and amount of demulsifier suitable for the on-site crude oil desalination process can be evaluated.

10. After the experiment is completed, open the cooling water valve and do not open it too wide. Open the vent valve to release pressure until the heating temperature reaches around 60 ℃. The pressure must be zero before opening the lid of the aluminum bath and taking out the sample bottle.

11. Cut off the power supply of the instrument and clean the utensils used.

7、 Attention:

The current setting range is 1-80mA, but in practical use, it is generally not advisable to set it too low. It can usually be set to around 50mA. If the setting is greater than 50mA, the high voltage should be reduced accordingly. When starting the high voltage and the high voltage button has been adjusted to zero, if the instrument has an overcurrent alarm, it should be reset and the current setting value should be checked for correctness.

Before placing the sample bottle in the aluminum bath, the lid should be loosened to avoid explosion caused by high air pressure inside the bottle.

3. The contact between the high-voltage lead out terminal of the high-voltage box cover and the electrode bottle cap should be kept clean. Six sample bottles should be placed in the aluminum bath hole so that the height of the electrode bottle cap is basically * *, ensuring good contact between all electrodes.

If six samples cannot be made, empty sample bottles must be used instead.

When the instrument is not in use, it should be placed in a dry place to avoid moisture and affect normal operation.

During the testing process and when the six fixed screws have not been loosened, do not press the up and down keys on the auxiliary unit to avoid damaging the instrument.