In addition to the need to soften the water used in the hot water boiler, it is also necessary to pay attention to the water temperature and the temperature of the incoming water to avoid damage to the boiler when entering the water and reduce the service life of the boiler. The gas hot water boiler manufacturer–Fang Boiler, Let me introduce the precautions in detail.
When the hot water boiler is started cold, the metal temperature of each component is the same as the ambient temperature. When the high-temperature water enters the steam drum, the inner wall of the steam drum contacts the hot water, the temperature rises immediately, and the temperature rise of the outer wall of the thick-walled steam drum is slow, and the temperature difference between the inner and outer walls of the steam drum. The thicker the wall of the drum, the greater the temperature difference between the inside and the outside, and the greater the thermal stress generated.
The higher the temperature of the upper water, the faster the water supply speed, which causes the temperature difference between the inner and outer walls of the steam drum to be larger. When it is serious, the steam drum wall will be plastically deformed or even cracked. In addition, the upper water temperature is high, the water supply speed is fast, and it is easy to cause uneven expansion of various parts of the water wall. Therefore, when the boiler is watered, there are certain restrictions on the water temperature and the water supply speed.
General provisions: When the cold water is on the water, the temperature of the water entering the steam drum should not exceed 90 °C. The water level reaches the normal water level of the steam drum -100mm, the medium pressure boiler is not less than 1h in summer and not less than 2h in winter; the boiler above high pressure is not less than 2h in summer and not less than 4h in winter. If the boiler metal temperature is low and the water temperature is high, the water supply time should be extended appropriately.
For natural circulation boilers that are not completely cooled, the difference between the water temperature entering the steam drum and the wall temperature of the steam drum is within 20 °C (positive value), the water supply speed may not be limited by the above, just be careful not to cause the pipeline due to water supply. Water can be shocked.
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