Daily Topic (June 5)
Thread Content
How should the economizer be protected during the start-up and shutdown of the boiler?
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
During the start-up and shutdown of boilers, it is common to open the recirculation valve in order to create a natural circulation between the steam drum, the recirculation pipes, the economizer, and the steam drum itself, as a way to protect the economizer. Practice has shown that this method of using the recirculation valve to protect the economizer is not very effective; the main reason for this is that the pressure generated is too low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank. By opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coil tubes.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
Currently, it is common to open the recirculation valve, which creates a natural circulation between the drum, the recirculation pipes, the economizer, and the drum itself, thereby serving to protect the economizer. However, this natural circulation is unstable; therefore, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank. This valve is opened when the boiler is started or stopped, in order to ensure continuous flow of water within the economizer and thus protect it.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank. By opening this valve during startup and shutdown, continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.
During the startup and shutdown of boilers, the recirculation valve is usually opened to create a natural circulation between the drum, the recirculation pipe, the economizer, and the drum itself, as a way to protect the economizer. Practice has shown that the measure of using open recirculation valves to protect the economizer is not very effective, mainly because the resulting pressure head is very low, making it difficult to maintain normal water circulation. To this end, some boilers are equipped with a return pipe fitted with a valve between the economizer outlet and the deaerator tank or drain tank; by opening this valve during startup and shutdown, a continuous flow of water in the economizer is ensured, thereby providing reliable cooling for the economizer’s coiled tubes.