Discussion on the process operation of heat exchange equipment
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This post was last edited by gn_1984 on 2015-7-28 at 11:39: Purging of the heat exchange equipment, single-pass purging. For the other phase, it should be ( ) A) Open the vent valve B) Close the vent valve C) Pressurize D) Cool with water. Feel free to share your thoughts and provide explanations.......
That’s a very interesting question. I think it should be: B) Close the vent valve, as this is more conducive to pressure balance between the two stages.
This topic is quite interesting, with an open answer. From the perspective of balancing both the tube side and the shell side, the results are clearly not very satisfactory, as one side is filled with a purging medium while the other side should contain air. To achieve balance, it is necessary to have sufficient pressure in the purging side in order to compress or expand either the tube side or the shell side, thereby enabling equal pressures to be established. Clearly, the purging medium does not require such high pressure. Personal opinion, for reference only
The main concern is the external pressure on the pipe train. If the shell side is purged and a high pressure is generated in it, it poses a risk to the tube bundle. So I consider using a pipe seal; when external pressure is applied, the pressure inside the pipe also increases slightly, thereby providing a certain balancing effect. This is probably slightly better than venting the tube to the atmosphere.
In that case, the purging condition should also be considered as a design condition for the heat exchanger, so that work can be carried out with confidence.
Blowing here is generally considered to be the process of using steam to clean the media in the tube side and shell side; the temperature and pressure of the blowing medium are not very high, and low-pressure steam is usually sufficient, so the answer should be A. Prevent equipment damage due to pressure buildup in the other section caused by an increase in the temperature during one stage of purging. For reference only.
Purging of the cold exchange equipment, single-pass purging. For the other stage, (A) the vent valve should be opened to prevent pressure buildup in that stage, which could damage the equipment due to the increase in temperature during purging in the first stage.
Open the vent valve. Use the process of elimination. Neither pressurization nor cold water is possible. Because it is a maintenance period, safety comes first.
Purging of the cold exchange equipment, single-pass purging. For the other step, it should be (A) ) A) Open the vent valve B) Close the vent valve C) Pressurize D) Cool with water. Feel free to share your thoughts and provide explanations.......