Parameters of the deaerator
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Hello everyone. The water used to fill the gas holder in our hydrogen production unit is demineralized water; after heat exchange with medium-temperature steam, it enters the deaerator. After being pressurized by a pump, it is heated to around 180 degrees before entering the gas holder. At present, the vent volume on the deaerator is considered too large – the steam supplied to the deaerator is adjusted to a very low flow rate manually, and the vent at the top of the deaerator is almost completely closed; only a slight amount of vapor escapes from it. The temperature of the deaerator is controlled by adjusting the temperature of the demineralized water fed into it. Can this method achieve effective deoxygenation? This post was last edited by shiyue528 on 2008-1-23 13:34.]
The requirement for steam shutdown is to prevent the steam pipes from freezing; a slight excess of steam is sufficient. Certain parameters of the deaerator ensure effective deoxygenation, such as a pressure of 0.02 MP and a temperature of 104 degrees, among others. What are the consequences of variations in these parameters? ? How is successful deoxygenation determined?
0.02 MPa is used to maintain a slight positive pressure; too high a pressure can affect the deoxygenation process carried out by the deoxygenation unit. The temperature is generally kept between 102 and 104 degrees. This temperature range represents the optimal level in terms of energy consumption and ensuring that water quality meets standards. To maintain this temperature, it will be difficult to achieve it if the amount of deoxygenation steam used is too small
Deaerators are divided into thermal deaeration and chemical deaeration. Thermal deaeration makes use of parameters such as a pressure of 0.02 MPa and a temperature of 104 degrees. In thermal deaeration, the saturated temperature of water is achieved under low pressure, which results in a dissolved oxygen level of 0 in the water, thereby achieving deaeration. If the pressure is high, the temperature must also be high; however, the height of the water seal limits any increase in pressure. If the pressure is low, it is theoretically possible to lower the temperature slightly, but since it is already a low pressure, it is difficult to maintain balance from an operational control perspective. A low temperature obviously prevents the attainment of the saturated temperature at that pressure, thus affecting the deaeration effect. Deaeration is considered successful when the oxygen content meets the specified standards; one can refer to the regulations of the power plant for more details
Over 100 degrees is sufficient. Our company heats both the upper and lower parts of the deaerator, but generally we use the lower part, with 3 kilograms of steam
The temperature of the deionized water in our upper deaerator is adjustable, and it can go up to 150 degrees. It’s still around seventy or eighty degrees even when it’s low. Can reducing the flow rate of the vent above help remove oxygen?
The top vent of the deaerator is adjusted to a lower level, but not completely closed, so that oxygen has a way to escape； The maintenance pressure of the deaerator is 0.02 MPa, which ensures that oxygen can escape by overcoming atmospheric pressure ； Since the boiling point of water at normal pressure is 100 degrees, and it exceeds 102 degrees at 0.02 MPa, the temperature in the deaerator is generally maintained between 102 and 104 degrees. If the temperature is too low, the water does not reach a boiling state and oxygen cannot be removed; if it is too high, it is not conducive to energy savings. This post was last edited by maysee on 2008-1-23 13:50.]
The deaerator in our plant is difficult to control; whenever more steam is supplied, it seems that the pump cannot deliver enough flow. Is this because the distance between the steam inlet and the pump outlet is 300 mm? ), if it’s small, the deoxygenation temperature won’t be reached. Does anyone have a screenshot of the deoxygenator? Please show it to me