Intermittent blowdown of the drum
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Since the intermittent drainage from the methanol drum does not recover heat, can the sediment in the drum be discharged directly into the drain to eliminate the various equipment used for this intermittent drainage?
If the amount of waste discharged is very small, it’s acceptable to release it into the drain; the water contains only a little salt, at a very low concentration, so it won’t cause pollution. ““What are the various devices for removing intermittent sewage discharge?” I’m not sure what you mean
The waste water from the interstage cooling system can be recycled. We direct this waste water from the waste boiler’s interstage cooling system to a recycling tank, where it is settled before being used in the low-pressure boilers at the coking plant.
It’s okay not to recycle it; the water quality of this portion is still good enough to be reused. It would be a shame to throw it away.
Reply to 2# zhy809078: Devices for intermittent wastewater discharge include intermittent discharge tanks and safety valves, etc. If the water can be discharged directly into the sewer, the cost of such devices can be avoided. The design proposed by the design institute involves mixing process water with wastewater in an intermittent discharge tank before releasing it; heat is not recovered in this process. Therefore, it is thought that if the wastewater from the bottom of the steam drum can be discharged directly, then there is no need to design an intermittent discharge tank
Heat recovery is just one aspect; if the drum water is discharged directly into the drain, it can cause burns. We have the waste water treatment equipment you mentioned: it’s a tank that uses wastewater to generate steam at 0.35 MPa, which is then fed into the steam network. The water after that passes through a circulating water cooler to be cooled, and finally is discharged into the drain, with a temperature of around 40–50 degrees.
Reply to 6# yuanjia0130: I support your approach. In factories with many boilers, the steam generated from this waste-steam flashing can be used entirely for insulation and heating (central air conditioning)
We don’t have any wastewater storage tanks here; the waste water is sent directly to the wastewater treatment system! The interposed valves are essential; they play a role in regulating the level of liquid in the drum!