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This post was last edited by yuchenchf on 2016-12-16 at 11:04. Steam is widely used as an important heat transfer medium due to its properties such as ease of transportation and high heat content. Saturated steam releases latent heat, undergoes a phase change, and transforms into condensed water of the same temperature and mass. These condensate waters not only still contain a high amount of heat but are also distilled water, making them very suitable for boiler make-up water. Even if the condensate is contaminated and cannot be recycled to the boiler, it can still be used in other heating processes to make full use of its heat content. The economic value of recovering condensate water is significant, as it can help companies reduce heat energy waste by up to 30%. At the same time, the recovery of condensate water also holds great social significance. 1) Reducing the cost of steam production: The percentage of heat contained in the condensate relative to the total heat of the steam increases from 15.7% at atmospheric pressure to 30.7% at 15 barg. If this condensed water is used as boiler feedwater, the heat required for the heating and vaporization of the feedwater will be reduced. In this way, boiler fuel costs will be significantly reduced. At the same time, the recycling of condensate water reduces the amount of water needed to feed the boiler, thereby lowering water costs. Furthermore, after removing the impurities associated with the transportation process, the condensed water can be directly fed into the boiler deaerator and the boiler feed water tank, thereby reducing water treatment costs. In addition, in areas where regulations exist regarding the discharge temperature of condensate water, it is also possible to save on the costs associated with lowering the temperature of the condensate water. 2) Improve the quality of boiler feed water. Condensate water is distilled water and contains almost no dissolved solids (TDS). When the TDS level in the boiler is high, foaming and steam carrying water tend to occur. These dissolved solids entering the steam system can contaminate control valves, gas-using equipment, and drain traps. 3) Reducing waste discharge: Thanks to the extremely low TDS level of the condensate water, the more condensate water that is recovered and used as make-up water for the boiler, the less waste water the boiler needs to discharge. As a result, losses related to energy and water resources due to waste discharge are reduced. 4) Increase boiler output: When condensate water at a higher temperature is used as make-up water for the boiler, less heat is required to heat the water, which reduces the energy needed to produce the same amount of steam, thereby increasing the boiler’s output. 5) Extending system lifespan and improving operational safety: Continuously recovering as much condensate as possible to use as make-up water for the boiler helps maintain a stable and high-quality level of condensate within the system, reduces corrosion of pipes, valves, and equipment, extends their lifespan, and enhances the safety of system operation. 6) Positive impact on the environment: Recycling condensed water can reduce the fuel consumption of boilers, thereby decreasing CO2 emissions. It also reduces air pollution caused by NOx and SOx, helping to meet emission reduction targets. In short, there are many benefits to recycling condensate water; merely reducing heat loss can achieve as much as 30%. How can we remain indifferent and take no action in the face of the economic losses and other consequences caused by waste of condensate water!