[Q&A Question 145] 2016.09.12
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【Q&A Question 145】September 12, 2016: How to put a reboiler into operation? The answer key will be available after responding; scoring is based on answering the key points. (1) Drain all accumulated water before introducing oil into the tower; once oil is introduced, cold oil will flow into the reboiler. Make sure to open the drain valve at the lowest point of the shell side first, and close it once oil is visible in the vent. (2) Pay attention to the temperature at the temperature measurement point returning to the tower in the shell side; once the temperature rises to a stable value, it indicates that the shell side is filled with cold oil. (3) Open the tubular side drain valve to drain any remaining oil or water, then close it. Fully open the control valve of the heat source bypass line, slowly open the heat source outlet valve, and then slowly open the heat source inlet valve. (4) After verifying that there are no leaks in the reboiler tube box, flanges, valves, instrument nozzles, etc., slowly close the heat source bypass control valve to adjust the temperature of the fluid returning to the tower to meet the process requirements.
1 First, open the low-point vent on the tube side of the reboiler to drain any accumulated water; close it once oil is visible in the vent. 2. Open the upper and lower vents on the shell side of the reboiler, drain all accumulated oil and water, and then close them. 3. Open the control valve of the hot source bypass line fully, open the hot source outlet valve, and slowly open the hot source inlet valve. 4. Slowly reduce the heat bypass until it meets the process requirements.
(1) Slowly open the bypass valve adjacent to the reboiler’s steam inlet to warm the pipes, and open the reboiler’s outlet drain valve to discharge the condensed steam water. (2) After the drain valve has emptied the condensate, open the bypass valve of the condensate control valve and close the drain valve. (3) After warming the pipes before and after the drain valve, activate the control valve and close the bypass valve. This startup process should be carried out slowly to prevent water hammer and damage to the equipment caused by excessive heating.
Add about 60% of the material to the tower, allow condensate water to flow out of the reboiler, and slowly introduce steam into the reboiler: this way, water hammer can be prevented
Please use the cold medium first, and then the hot medium.
1. Add about 60% of the material to the tower. 2. Release the condensate water from the reboiler. 3. Slowly add steam to the reboiler: this will prevent water hammer (impact). 99 Impact
First, inject cold oil: Before introducing oil into the tower, drain any accumulated water first. Once oil is introduced into the tower, the cold oil will flow into the reboiler. Make sure to open the vent valve at the lowest point in the tube side first; once oil is visible in the vent stream, it can be closed. Afterwards, introduce the heat flow gradually.
Blow out the reboiler, perform purging, ensure airtightness; open the hot-side drain. First, operate the cold side at an excessive flow rate, close the hot-side drain, then slowly open the hot side while gradually increasing the temperature of the cold side – keeping it at no more than 30°C. Slowly open the cold side to full capacity, using the hot side to control the temperature
First, pour in the medium that needs to be heated, then add the heat source