The residual pressure of the circulating water drives the turbine to generate electricity

In your factory, the return pressure of the circulating water is 0.3 MPa; what is the supply pressure? It is recommended to optimize the circulating water pipeline or reduce the water supply pressure in order to address waste at its source

Our factory has just carried out technical upgrades; in these upgrades, a turbine is used to drive the fan by utilizing recycled water. The turbine does not require high pressure from the recycled water – only a sufficient flow rate is necessary

This refers to the topic of discussion. Currently, “energy conservation” is a popular term, giving rise to many initiatives aimed at achieving this goal. That’s one of them you’re talking about. (Seems like a bit of a prejudice?) Hehe) There are applications of this technology that seemingly save electricity or steam, but they also bring side effects to the production process. The turbine rotates slowly, resulting in a reduced gas velocity inside the tower ； The cooling capacity is significantly insufficient during high summer temperatures ； The return water undergoes energy consumption as it passes through the turbine, which affects the water distribution; this can lead to uneven flow within the tower and allow air to take a shortcut ； So, such modifications must be approached with caution! You can’t just rely on what the manufacturer says. Ask well-known design firms whether this technology is feasible ? ? ? ? ? ? ? ? ? ? ? ? ?

“\"Energy conservation\": The returning water has excess kinetic energy to do work, which indicates that there is an excess of kinetic energy in the incoming water! Support the views from the 2nd and 4th floors. Increasing recycling inevitably leads to mechanical wear; it is better to address the issue at its source by reducing power consumption.

I’ve heard of systems that use the waste heat from compressor cooling water for heating or bathing. Although the benefits aren’t very significant, over time they still add up to considerable advantages. Your approach is great, but I’m not sure if it’s feasible There is an issue of cost-benefit ratio here. Companies are currently focusing on reducing costs and increasing efficiency; I hope you can achieve this as well.

Our factory has just been renovated; the recycled water is used to drive the turbine and cooling fans, but the effect is not very good. The return water pressure is low at 90.4 MPa, resulting in insufficient fan speed and an inability to lower the temperature of the circulating water.

It’s theoretically feasible; the key is to obtain a design that suits your actual conditions on site. Personal opinion

If the circulating water pump is driven by a turbine, then reducing the speed of the turbine directly lowers the outlet pressure of the circulating water pump. The control of the lower limit value for this outlet pressure: in the case of a closed-loop system, it is determined based on the requirement to deliver water to the cooling tower in a uniform manner； It is of open-loop type, based on the principle of continuous water supply. If necessary, the turbine speed can be appropriately increased to enhance cooling.

At a pressure of 0.3 MPA, the rotation speed will not be too high, and the generator will not be able to drive it. It is recommended to reduce the pressure of the circulating water to meet the basic pressure required for the return flow.

To modify a turbine, it is necessary to raise the water return level in the tank. An increase in this level inevitably leads to an increase in the water pressure at the return point, which in turn forces an increase in the outlet pressure of the circulation pump. Specific calculations regarding energy consumption have not been done, but since the power required by one motor is reduced, the power required by all the pumps increases, resulting in poor energy efficiency. Generally, when modifying turbines, only a few of them are altered; yet this increase in return water pressure causes the pressure at those areas that haven’t been modified to exceed the design specifications, leading to wasted energy. It’s difficult for the speed of a turbine to meet the design parameters set by the manufacturer, unless the water pressure is increased further. However, if the operating conditions are not extreme and the turbine can handle the heat in hot weather, then modification is possible. After all, maintaining a turbine is much simpler than maintaining motor-driven fans, as little maintenance is required. In my opinion, energy consumption will only increase