(Daily Question) Coal-to-oil and olefins forum, February 5, 2018

One is through leaks in the vacuum system of the unit, and the other is by entering the condenser along with the steam. Since the boiler feed water undergoes multiple deoxygenation processes, the latter is present in small quantities, accounting for only a few percent of the total air drawn from the condenser. Therefore, the extracted air mainly leaks in through the gaps in the components due to the negative pressure condition of the unit. In addition to the tightness of the condenser itself, the airtightness of the vacuum system is also important; this includes components such as the feedwater heater, low-pressure cylinders, steam shaft seals, and pipes for venting air. A large amount of air leaking into the condenser will lead to deteriorated heat transfer in the condenser, overload the pumping equipment, cause a sharp increase in the subcooling and oxygen content of the condensed water, disrupt the vacuum level in the condenser, and prevent the condenser equipment from functioning properly. The main areas where leaks can occur are: the steam seals at both ends of the low-pressure cylinder as well as the joint surfaces of the low-pressure cylinder; the flange connections of the pipes that link the medium-pressure and low-pressure cylinders; the welds where the exhaust pipe of the low-pressure cylinder is connected to the throat section of the condenser; and various valves and flanges that operate under negative pressure.

Answer: Air leaks in through two channels: one is through the gaps in the vacuum system of the unit, and the other is into the condenser along with the steam. Since the boiler feed water undergoes multiple deoxygenation processes, the latter is present in small quantities, accounting for only a few percent of the total air drawn from the condenser. Therefore, the extracted air mainly leaks in through the gaps in the components due to the negative pressure condition of the unit. In addition to the tightness of the condenser itself, the airtightness of the vacuum system is also important; this includes components such as the feedwater heater, low-pressure cylinders, steam shaft seals, and pipes for venting air.

One is through leaks in the vacuum system of the unit, and the other is by entering the condenser along with the steam. Since the boiler feed water undergoes multiple deoxygenation processes, the latter is present in small quantities, accounting for only a few percent of the total air drawn from the condenser. Therefore, the extracted air mainly leaks in through the gaps in the components due to the negative pressure condition of the unit. In addition to the tightness of the condenser itself, the airtightness of the vacuum system is also important; this includes components such as the feedwater heater, low-pressure cylinders, steam shaft seals, and pipes for venting air. A large amount of air leaking into the condenser will lead to deteriorated heat transfer in the condenser, overload the pumping equipment, cause a sharp increase in the subcooling and oxygen content of the condensed water, disrupt the vacuum level in the condenser, and prevent the condenser equipment from functioning properly. The main areas where leaks can occur are: the steam seals at both ends of the low-pressure cylinder as well as the joint surfaces of the low-pressure cylinder; the flange connections of the pipes that link the medium-pressure and low-pressure cylinders; the welds where the exhaust pipe of the low-pressure cylinder is connected to the throat section of the condenser; and various valves and flanges that operate under negative pressure

One is the leakage in from the leaky parts of the unit’s vacuum system. Second, it enters the condenser along with the steam.

Answer: The air in the condenser enters it mainly through leaks in the vacuum system of the turbine； Also, the non-condensable gases dissolved in the boiler water enter the turbine along with the steam; after doing work with the steam, they are discharged into the condenser.

Answer: Air leaks in through two channels: one is through the gaps in the vacuum system of the unit, and the other is into the condenser along with the steam. Since the boiler feed water undergoes multiple deoxygenation processes, the latter is present in small quantities, accounting for only a few percent of the total air drawn from the condenser. Therefore, the extracted air mainly leaks in through the gaps in the components due to the negative pressure condition of the unit. In addition to the tightness of the condenser itself, the airtightness of the vacuum system is also important; this includes components such as the feedwater heater, low-pressure cylinders, steam shaft seals, and pipes for venting air.

The air in the condenser enters it mainly through leaks in the vacuum system of the turbine； Additionally, the non-condensable gases dissolved in the boiler water enter the turbine along with the steam; after doing work with the steam, they are discharged into the condenser

The air in the condenser enters it mainly through leaks in the vacuum system of the turbine； Additionally, the non-condensable gases dissolved in the boiler water enter the turbine along with the steam; after doing work with the steam, they are discharged into the condenser

Air leaks in through two channels: one is through the gaps in the vacuum system of the unit, and the other is into the condenser along with the steam. Since the boiler feed water undergoes multiple deoxygenation processes, the latter is present in small quantities, accounting for only a few percent of the total air drawn from the condenser. Therefore, the extracted air mainly leaks in through the gaps in the components due to the negative pressure condition of the unit. In addition to the tightness of the condenser itself, the airtightness of the vacuum system is also important; this includes components such as the feedwater heater, low-pressure cylinders, steam shaft seals, and pipes for venting air.