The air cooler of the steam turbine in the 1-to-2 unit does not provide adequate cooling

Neither of these two solutions is feasible; the key factor is the operating condition of the air cooler. Hehe, different structures of air coolers result in different operating modes. Hehe, send me the operation footage of your air cooler and I can provide a diagnosis. In particular, parameters such as the return water temperature and the exhaust pressure of the turbine.

The first method is not feasible; there’s no way to cool the air. The second method can be considered, but you need to make sure that the size of the condensate pump is sufficient, and also that the amount of water used for spraying is properly controlled. In fact, this is a problem that exists in many places; it would be best to add another set of coolers if possible! ! !

You can calculate it – the second method simply doesn’t work.

(The current ambient temperature is around 10 degrees. For the 10 air-cooled fans, the frequency setting is 95, with a rotation speed of around 1200; they are arranged in a symmetrical pattern.) The exhaust pressure entering the liquid collection tank is -0.069 MPa, while the exhaust temperature is 59 degrees. The pressure in the air cooler is -0.072 MPa, and the temperature there is 53 degrees. This value changes accordingly with the ambient temperature; the higher the ambient temperature, the lower the vacuum level. The exhaust system includes a main exhaust pump and an auxiliary exhaust pump; the pressure of the condensate pump is 0.4 MPa, which is more than sufficient to meet the operational requirements. Additionally: First, directing the mixture discharged from T23A02 to the bottom of fan AE24A01 so that it blows upward, and using the fan to distribute it evenly across all the heat exchange tubes – why is this not possible? Second, what if, without considering the workload of the condensate pumps, atomized softened water is evenly injected into the steam discharge header upstream of V24A03 and downstream of AE24A01? I earnestly ask all the experts to answer my questions.

Methods: 1. Use spray humidification – by atomizing deionized water, air humidity is increased which helps to lower the temperature; with proper design, the temperature can be reduced by 5-8 degrees. 2. Add more water coolers, provided there is sufficient circulating water available. 3. For confidential inquiries, please contact me directly!

Based on the data you provided – namely, that the exhaust pressure entering the condensate tank is -0.069 MPa and the exhaust temperature is 59 degrees, while the pressure in the air cooler is -0.072 MPa with a temperature of 53 degrees – these figures are inaccurate. Calculations show that the exhaust pressure of your turbine should be 31 KPa in absolute terms, corresponding to a temperature of around 69 degrees, rather than 59 degrees. As for the exhaust pressure of the air cooler, it should be 28 KPa, with a corresponding temperature of 67.51 degrees. It appears that either the exhaust temperature or pressure of the turbine is incorrect. If we assume that the data provided for the air cooler is correct, then the subcooling degree of the condensate water would be around 14.5 degrees. Therefore, it seems that there is an issue with the operation of the air cooler. For the analysis of air coolers, accurate data collection is required in order to make proper judgments. Based on the 10 fans you provided, your air separation unit’s capacity will be no less than 50,000 NM3/H. As for your idea of spraying soft water into the air coolers, you can carry out a calculation: steam volume used * temperature drop * specific heat / (latent heat of vaporization of water * specific heat). The calculations show that a large amount of water is required, so this approach is not feasible ； The second option: it involves a large amount of work, is unsafe for inspecting the air coolers, and the measurement accuracy is also insufficient. Hehe, just my humble opinion. Please don’t laugh at me.

The first option is not feasible. The second method is also difficult to implement; unless your pump has a large design margin, the level of liquid in the heat well (or the condensate tank) will exceed the alarm threshold, leading to shutdowns or even damage to the main shaft

Insufficient heat exchange area in the air-cooled island design is a problem that occurs in many projects; if such a situation indeed exists, modifications must be carried out. Using spray water and drainage pumps inside the waste steam pipes is not a viable solution as it does not address the actual issue. Moreover, no matter how much water is used, the entire heat well will need to be modified!

It only treats the symptoms, not the root cause; adding more units also doesn’t yield much effect. The most fundamental solution is to add another column and determine how many fans to include based on calculations!

Could you try contacting the manufacturer to adjust the angle of the fan blades? It is also possible to add a spray cleaning device outside the fins, which works very well especially in summer.