What are the factors that affect the performance of the preprocessor?

This post was last edited by pzhhuagong on 2010-7-25 at 14:08. Refer to the internal training materials: 1. Principle of separation by the preprocessor; the separation principle is described in pressurized floating separation. The quality of the preprocessor’s performance depends mainly on the adhesion of impurity particles to the bubbles. This adhesion process is determined by four stages: refining reaction, pressure-induced dissolution, pressure-release, and adhesion aggregation; meanwhile, regular sludge removal is also a key factor affecting the clarification efficiency. 2. Preprocessor operation precautions: (1) The preprocessor should operate in a smooth, stable, and even manner. \"Smooth\" means that the water outlet should be level, and it is generally not adjusted after initial setting; \"stable\" refers to steady upward movement; and \"even\" means that the flow rate at the water outlet as well as the sludge discharge should be uniform. (2) When operating the preprocessor, attention should be paid to whether the saltwater at the outlet is clear and whether the air flotation effect is stable. (3) Is the color of the floating impurity particles normal, and is sludge discharge appropriate? (4) Sludge discharge from the top: 1–2 times per shift; sludge discharge from the bottom: 2–3 times per shift. 3. Turbid water output from the preprocessor The preprocessor is one of the key devices, and its proper operation directly affects the performance of the entire system. If the water output from the pretreater is found to be turbid, it can be determined by considering the following aspects: (1) Whether the dissolved air pressure is normal. Under normal conditions, the dissolved air pressure should remain around 0.25 Mpa; if the pressure is too low, proper dissolution of air will not occur, while too high a pressure will reduce the pumping capacity of the pump. (2) Whether the magnesium ion content in the raw salt exceeds the designed range: Since only 5 liters of air can dissolve in each cubic meter of brine, the amount of magnesium hydroxide that can be suspended in it is also limited. Exceeding the designed range will directly affect the performance of the pretreater, causing the effluent from the pretreater to become turbid. (3) Is the amount of ferric trichloride added within the designed range? Once ferric trichloride enters the brine, it rapidly hydrolyzes to form iron hydroxide. Due to its very large specific surface area, iron hydroxide can neutralize the electrical charge of particles and adsorb organic matter; simultaneously, acting as an inorganic flocculant, it wraps around magnesium hydroxide colloids and other salts that are difficult to settle, and the resulting tiny air bubbles lift them to the surface of the pretreatment liquid. Analyze the concentration of the ferric chloride solution, and adjust the valve of the ferric chloride flow meter to the range required by the process.

The most important factor is the quality of the salt; if the salt is of good quality, everything will be fine. Of course, if the quality of raw salt varies significantly due to seasonal factors, the best solution is to wash the salt. I’ll talk more about this later when I have time!

As long as the process parameters are properly controlled, no abnormal phenomena will occur; the flow rate, concentration, and temperature need to be kept stable, and it is sufficient to control the amount of ferric trichloride, the amount of excess alkali, and the amount of dissolved gas.

Stable control is very important; rapid changes in the temperature difference between the front and back areas, as well as changes in saltwater concentration, can easily lead to flooding. It is crucial to keep all relevant parameters under control.

First and foremost, it is the quality of the raw salt; secondly, all various specifications must be met; lastly, the removal of sludge from the top and bottom cannot be ignored.

1. Check the quality of the raw salt. 2. Keep the temperature difference of the brine at no more than 5 degrees. 3. Control the amount of alkali added properly. 4. Increase or decrease the sludge discharge based on the conditions of the raw salt. 5. Maintain a stable flow rate of brine entering the pretreater. 6. Control the dissolved air pressure at around 0.25 Mpa. 7. Check whether the amount of ferric chloride added is within the specified range