The washing absorption tower has severe water accumulation
Thread Content
The company has newly installed a set of exhaust gas absorption equipment that uses a two-stage washing tower with water circulation to absorb the exhaust gases. The fan is located behind the tower; when its speed is increased, there is excessive water carried along, which causes the liquid level in the washing tower to drop rapidly. Do any of you have any solutions to this problem?
This post was last edited by CHANGBAISHI on 2020-1-15 08:00. The principle of a wash tower is that there is a certain ratio between the rising gas and the returning liquid; when the amount of returning liquid remains constant, if the amount of rising gas exceeds this ratio, a phenomenon known as \"liquid flooding\" occurs. The correct way to adjust it is to have the air volume control valve located at the fan inlet in an open position when the fan starts up. After normal startup, gradually open the high-air-volume control valve until the condition of “***approximately with water****” is reached, which is optimal. The air volume cannot be increased indefinitely. It is an operational issue; it is best to consult the design firm and refer to the parameters specified in the equipment’s user manual.
Check the design documents to see what the recommended water and gas flow rates are, and whether the temperature range falls within the specified limits. Senior Shiraishi is referring to a parameter exploration method commonly used in practice; it fits well with the variations in actual operating conditions and allows for more reasonable values to be determined.
If the exhaust gas to be treated contains virtually no moisture, then using a water scrubber for absorption treatment inevitably results in saturated water being carried away in the purified gas. The installation of a wire mesh mist eliminator at the top of the tower can only reduce the amount of free water mist carried along.
Check whether liquid water comes out of the fan behind the tower; if so, it indicates severe mist entrainment. Installing a demister in the gas pipeline from behind the tower to the fan can resolve this issue. If not, that means the evaporated water was taken away. Check the humidity at the exhaust gas inlet to see if adjusting the operating temperature could solve the issue.