The effect of circulating water pressure on scaling

It should have an impact; in material processes that involve heat exchange, there are usually specific requirements regarding the pressure of the circulation pump. When the pressure drops, the flow rate also decreases, the efficiency of heat exchange declines, and scaling accelerates.

1. After replacing the impeller of the circulating water pump in our company, the pressure dropped from 4 kilograms to 3 kilograms; we’re not sure what impact this will have on the manufacturing process. Answer: First, it affects his traffic, as the likelihood is high that it’s not properly matched or secured. The impact on the process is definite; for example, in terms of cooling, if the flow rate is insufficient, the amount of heat removed will also be different. 2. For example, does it have an impact on the scaling of heat exchangers? Answer: There is a significant impact. For example, in terms of reaction time, when the temperature is not cooled sufficiently, the problem of solvent leakage becomes severe, which results in wasted raw material costs and failure to achieve the desired results. That’s called losing both life and money. The only way is to use an oleic acid pump to wash back and forth until the dirt is removed and the water color remains unchanged, and then wash with clean water until all dirt is gone and the pH value is neutral.

This post was last edited by wsg2009 on 2009-11-16 at 16:32. I don’t think it will have any impact. It depends on your level of control. For now, let’s assume the following: 1. Modifying the impeller will result in a decrease in the pressure of the circulating water, but the flow rate of this water will still be sufficient to meet the requirements. Previously, you kept the outlet closed in order to maintain a high pressure in the pump, which led to energy waste ； That’s why you’re making modifications. 2. After the modification, the pipeline will have an upward slope, or you will control the flow rate using the valve at the condenser outlet (the control valve will be opened more after the modification); in other words, there is no possibility of uneven flow inside the condenser ； 3. Taking these two points into account, in fact there is no change in heat exchange or in the flow rate through the heat exchanger after the modifications are made. Since the flow rate through the heat exchanger remains unchanged, the flow velocity will also remain unchanged (as the flow area of the heat exchanger stays the same). With no change in flow rate or temperature difference, and only a slight decrease in water pressure, the impact on heat exchange should be minimal. As a result, the temperature difference between the inlet and outlet of the circulating water remains unchanged ； 4. From point 3, we know that there is no change in the flow rate or in the temperature difference of the circulating water; under these conditions, the rate of scaling will not change either ； 5. It should be emphasized that the purpose of this modification is to reduce the head pressure, not to decrease the flow rate through the heat exchanger or its heat exchange efficiency; it is merely an energy-saving modification! Since power and head are related by a square relationship, and power and flow rate are also related by a square relationship, such modifications are merely a means to save energy when the head is sufficient.

After replacing the impeller of the circulating water pump, the pressure dropped from 4 kilograms to 3 kilograms. The most significant impact on the production process is the reduction in flow rate due to the lower pressure of the circulating water; this leads to a decreased cooling capacity for all areas that require cooling within the process. As a result, some of the reaction equipment may overheat, posing risks to production and safety. Secondly, it accelerates scaling of the cooling equipment. Therefore, it is recommended not to make arbitrary changes to the process parameters of circulating water.

We modified the diameter of the impellers in the circulation water pumps, and this was sufficient to meet the flow requirements of all heat exchangers; energy savings were evident. However, after some time, corrosion of the heat exchangers occurred. A comprehensive analysis showed that water quality issues were the main factor, with slow flow rates also playing a role.

I don’t understand. The flow rate is related to the pipe diameter and flow volume; it doesn’t seem to have anything to do with pressure, does it? After modifying the impeller, the head decreases, but the flow rate through the heat exchanger remains unchanged. If a flow control valve is used, it simply means that the valve is opened wider; therefore, it cannot be assumed that the flow velocity will decrease.

1. It will have an impact on the manufacturing process; if there is sufficient pressure margin, then it’s not a problem. 2. Fouling is mainly related to factors such as the properties of the medium and flow velocity; too low a flow velocity can, to some extent, increase fouling. It is recommended to check the flow rate first to see if it is the same as before; if so, then there is no impact from the dirt.

There is no impact; if there were an impact, it would mean the modification failed, as the modification is merely intended to reduce the pressure associated with wealth, and it should not affect the flow rate of heat exchange. Therefore, when both the flow rate and the heat exchanger remain unchanged, there is no impact. Pressure has no effect on flow velocity; flow velocity is only related to cross-sectional area and volume flow rate. Of course, if pressure causes the molecules to be compressed, then the compressibility of the liquid is very low and can essentially be ignored ； If it is a gas, the flow rate calculated under standard conditions will be affected by the pressure level ； The people upstairs said it has an impact, but I think they are already describing the renovation as a failed one (due to insufficient heat exchange flow), in which case this issue loses its meaning

I think the factor with the greatest impact is the heat exchange efficiency; scaling is more closely related to water treatment. 1# wo*aohe

“After the impeller of the circulating water pump was replaced, the pressure dropped from 4 kilograms to 3 kilograms. The pressure mentioned here likely refers to the outlet pressure of the pump. A decrease in pressure indicates that the pump’s head – the effective energy gained by a unit weight of liquid as it passes through the pump – has decreased. According to the formula \"Pump head = Suction head + Discharge head\", the suction head remains unchanged while the discharge head decreases. For heat exchange equipment at the same height that relies on circulating water for heat transfer, a decrease in the outlet pressure of the circulation water pump leads, with all other conditions remaining unchanged, to a reduction in the flow rate and velocity of the circulating water, thereby diminishing the heat exchange efficiency of the equipment.