【Daily Question】Chemical Engineering Principles 533: Feedwater Quality in DC Boilers (March 20)
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The Chemical Engineering Theory section is launching the \"One Question per Day\" campaign starting today, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent campaigns will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\" – we hope you will give it your active support~~~ Replies to the \"One Question per Day\" campaign can be viewed directly at **; the topic will be closed after 1 day! ! To encourage everyone’s continued participation this year! Participation earns 3 wealth points, with an additional 4 wealth points for correct answers~~~ Short answer question: Why are the requirements for the quality of water supplied to DC boilers so strict? Answer: Since a DC boiler has no water circulation during normal operation, the working fluid turns directly from water to steam and becomes superheated after being heated in the heating surfaces. There is no drum, so it is not possible to add chemicals to the boiler water or to remove impurities from it. As a result, some of the salts and other impurities brought in by the feedwater settle within the boiler’s heating surfaces, while some reach the turbine and settle in the areas where steam flows. A small portion returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit inside the boiler and turbine. Before long, this can lead to tube failures, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain good water quality at all times, achieving a purity level similar to that of steam.
Since there is no water circulation in a DC boiler during normal operation, the working fluid turns directly from water to steam and becomes superheated once it is heated in the heating surfaces. Moreover, as there is no drum, it is not possible to add chemicals to the boiler water or to remove impurities from it. As a result, the salts and other impurities brought in by the feedwater settle partly within the boiler’s heating surfaces, another portion reaches the turbine and settles in the areas where steam flows, and a small amount returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit inside the boiler and turbine. Before long, this can lead to tube failures, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain good water quality at all times, achieving a purity level similar to that of steam.
Since a DC furnace has no water circulation during normal operation, the working fluid turns directly from water into steam and becomes superheated after being heated in the heating surfaces. There is no drum, so it is not possible to add chemicals to the boiler water or to remove impurities from it. As a result, some of the salts and other impurities brought in with the feedwater settle within the boiler’s heating surfaces, while another portion enters the turbine and settles in the areas where steam flows. A small amount returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will accumulate inside the boiler and turbine. Before long, this can lead to tube bursts, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain excellent water quality at all times, achieving a purity level comparable to that of steam.
In normal operation, a DC furnace does not have a water circulation system; the working fluid turns directly from water to steam and becomes superheated once it is heated in the heating surfaces. Since there is no steam drum, it is not possible to add chemicals to the boiler water or to remove impurities from it. As a result, the salts and other impurities brought in with the feedwater settle partly within the boiler’s heating surfaces, another portion makes its way to the turbine and settles in the areas where steam flows, and a small amount returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit inside the boiler and turbine. Before long, this can lead to tube failures, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit.
If the water quality is poor, most of the salts and impurities in the water will deposit inside the boiler. Before long, this can lead to tube bursts, or a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the boiler. As a result, the safe and efficient operation of the unit cannot be ensured.
Since a DC furnace has no water circulation during normal operation, the working fluid turns directly from water to steam and becomes superheated after being heated in the heating surfaces; furthermore, the absence of a steam drum makes it impossible to add chemicals to the furnace water or to remove impurities from it. Therefore, the salts and other impurities brought in by the feedwater settle partially within the heating surfaces of the boiler; for example, scaling occurs in the water wall, while salt deposition takes place in the superheater ； Another portion is carried into the turbine and deposited in the steam flow area, while a small amount returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit within the boiler and turbine. Before long, tube bursts may occur, or the steam flow area through the turbine may be reduced, forcing a reduction in load; in severe cases, accidents such as boiler shutdowns or turbine shutdowns may happen, thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain excellent water quality at all times, achieving a purity level comparable to that of steam.
If the water quality is poor, most of the salts and impurities in the water will deposit inside the boiler. Before long, this can lead to tube bursts, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict, and good water quality must be maintained at all times.
Answer: Since a DC boiler has no water circulation during normal operation, the working fluid turns directly from water to steam and becomes superheated once heated in the heating surfaces. As there is no drum, it is not possible to add chemicals to the boiler water or to remove impurities from it. As a result, some of the salts and other impurities brought in by the feedwater settle within the boiler’s heating surfaces, while some reach the turbine and accumulate in the areas where steam flows. A small portion returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit inside the boiler and turbine. Before long, this can lead to tube failures, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain good water quality at all times, achieving a purity level similar to that of steam.
Since a DC furnace has no water circulation during normal operation, the working fluid turns directly from water to steam and becomes superheated after being heated in the heating surfaces; furthermore, the absence of a steam drum makes it impossible to add chemicals to the furnace water or to remove impurities from it. Therefore, the salts and other impurities brought in by the feedwater settle partially within the heating surfaces of the boiler; for example, scaling occurs in the water wall, while salt deposition takes place in the superheater ； Another portion is carried into the turbine and deposited in the steam flow area, while a small amount returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit within the boiler and turbine. Before long, tube bursts may occur, or the steam flow area through the turbine may be reduced, forcing a reduction in load; in severe cases, accidents such as boiler shutdowns or turbine shutdowns may happen, thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain excellent water quality at all times, achieving a purity level comparable to that of steam.
If the quality of the feedwater is poor, most of the salts and impurities in it will deposit inside the boiler and turbine. Before long, this can lead to tube failures, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit.
Since a DC furnace has no water circulation during normal operation, the working fluid turns directly from water to steam and becomes superheated after being heated in the heating surfaces. There is no drum, so it is not possible to add chemicals to the boiler water or to remove impurities from it. As a result, some of the salts and other impurities brought in by the feedwater settle within the boiler’s heating surfaces, while another portion enters the turbine and settles in the areas where steam flows. A small amount returns to the condensate water. It can be seen that if the quality of the feedwater is poor, most of the salts and impurities in it will deposit inside the boiler and turbine. Before long, this can lead to tube failures, a reduction in the steam flow area of the turbine, forcing a reduction in load or even shutting down the plant – thereby compromising the safe and efficient operation of the unit. Therefore, the requirements for the quality of water supplied to DC furnaces are very strict; it is necessary to maintain good water quality at all times, achieving a purity level similar to that of steam.