【Weekly Topic】Issues regarding the utilization of by-product steam from Jinhua furnaces
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How can the 10.0 MPa high-pressure steam generated as a by-product in Jinhua furnaces be utilized more effectively? Has anyone among those who work in the marine industry conducted a comparison between gas superheating and boiler superheating? Are there any technical issues associated with using superheated steam in the boiler’s superheating section?
In actual production, the fluctuations in this steam volume should be taken into account. Of course, some of the 10MPa steam is sent for superheating, while some is used after being cooled and depressurized.
It would be best if it could overheat for use as a turbine drive. Has a comparison been made between using gas and the superheating section of the boiler for superheating, in cases where overheating occurs?
When it comes to turbine steam, there are several issues: 1. Distance needs to be taken into account, as this leads to heat losses. 2. Steam stability must also be considered; otherwise, the turbine cannot operate. Superheated steam can sometimes be directly burned using the flare gas from the plant, but this approach isn’t very effective either!
The turbine definitely needs to be superheated; using flare gas as a fuel source is equivalent to using fuel gas – I’m not sure if that’s cost-effective
The volume of this fuel gas itself is also unstable
I also would like to ask everyone whether this steam being sent to the boiler to cause overheating has any impact on the boiler’s stability?
If the existing boiler is to be used for superheating, then its insurance coverage needs to be modified. Normally, the heat utilization in the boiler is balanced; however, superheating the steam disrupts this balance. It is recommended to consider using gas for superheating or syngas, as this can ensure stable quality of the superheated steam, thereby allowing the turbine to operate more stably. As for flare gas, measures need to be found to ensure its stable operation.
What are the advantages and disadvantages of using saturated steam for superheating in vaporization units and for boiler feed superheating?
If saturated steam at 10 MPa is superheated before entering the boiler, it is necessary to adjust the boiler’s load. If the range within which the boiler’s load can be adjusted is within 30%, superheating the steam in the boiler can be considered; however, if this range exceeds 30%, it will affect the stable operation of the boiler. 10MPa saturated steam can be depressurized to 4MPa for power generation; the efficiency will be lower, but it is simpler.
Superheating saturated steam in a vaporization furnace poses significant safety risks, and there are currently no implementation examples. When it comes to boiler superheating, the size of the boiler plays a role; if the boiler is large, it’s not a problem to generate an additional amount of saturated steam.