The waste heat cooler experiences significant vibration
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In my workshop’s synthetic steam drum area, there are series-connected waste heat exchangers (floating-head type). The steam side of these exchangers handles the waste water from the steam drum; the temperature of this water is 230 degrees, and the pressure reaches up to 2.8 MPa. The shell side of the exchangers is fed with circulating water. The runtime pipe routine experiences significant vibration, accompanied by a thudding water hammer sound. What are the hazards of this? How to handle it?
A steam heater is experiencing a similar issue, and no professionals can explain it! ! ! I’m afraid that if I keep shaking it, it will eventually leak.
By keeping the pressure of the wastewater above the saturation pressure, or by keeping the temperature of the wastewater below the saturation temperature corresponding to that pressure, vaporization of the wastewater due to flashing can be prevented, and thus severe water hammer effects should be avoided.
Increase the water volume on the circulating water side to lower the temperature, and maintain stable pressure in the waste discharge pipeline.
A self-acting control valve is installed on the outlet side of the coolant fluid in the cooler to maintain stable pressure inside the heat exchanger.
The drum blowdown valve is located on the 20-meter platform; there is another valve in the blowdown pipeline on the 5-meter platform, and the blowdown cooler is on the ground level. Typically, the operators set the drum blowdown valve to half open and use the valve on the 5-meter platform to control the amount of blowdown. Did flashing occur due to the discharge of wastewater? Is it because the wastewater itself has already vaporized in the discharge pipeline, and then partially condenses in the cooler, resulting in water hammer?
There is a self-regulating valve at the coolant wastewater outlet
Vaporization should occur in all cases; the pressure in the drain line should be maintained using the valve at the outlet of the drain pump, keeping it above the saturated pressure corresponding to the temperature. If there is no valve on the pipeline at the outlet of the drain pump, a shut-off valve should be installed. By installing a thermometer and pressure gauge in front of the valve, adjustments can be made on-site while monitoring the readings. In the waste discharge pipeline, the medium should be a liquid; gas is not allowed to be present. If vaporization occurs, a liquid slugging phenomenon resulting from the coexistence of liquid and gas will arise. Regardless of the method used, as long as vaporization of the liquid is prevented, liquid hammer can be avoided.
Where does the cooled wastewater go? Check if there are valves at the back; trying to adjust them should have an effect
Yes, turn it down to reduce pressure, and then find a way to cool it down.