In power generation, every MWh is valuable. A simple way of increasing efficiency is to sootblow more often. With SootTech’s patented High Impact Soot System, sootblowing can be increased at the same time as the cost and duration of sootblowing is reduced.
High Impact Soot System:
- Halve consumption of steam during sootblowing
- Halve the time due to disruptions and reducing the load when sootblowing
- Halve the time the steam erodes the heat surfaces
It is a well-known fact that both heat and power yield drop between sootblowing sequences. The simplest way of increasing efficiency is to sootblow more often.
With the High Impact Soot System, steam costs are halved and sootblowing time can be increased, which means that sootblowing can be increased without increasing the cost and duration of sootblowing.
Below, are examples of how fluctuations in heat absorption have been eliminated in Eskilstuna Energi’s power boiler by doubling the sootblowing of the superheaters.
Examples where the characteristic reductions in heat absorption and electricity production between sootblowing sequences were completely eliminated by HISS sootblowing with doubled sootblowing of the superheaters.
Cheaper fuel ad extended boiler uptime
Burning cheaper fuels often cause a twofold coating problem. The ash normally causes both clogging and a higher temperature in the rear superheaters, which results in corrosion. Increased sootblowing of the superheaters is often necessary in order to limit flue gas temperatures and prevent the ash from sintering on the tubes, which causes clogging.
With the High Impact Soot System, steam costs and the time needed for sootblowing are halved, which means that sootblowing can be increased, even quadrupled, without any increase in the total duration or cost of sootblowing. Because HISS sootblowing can increase sootblowing capacity many times over, the technology provides a natural way of incinerating aggressive and cheaper fuels.
HISS technology’s ability to increase sootblowing capacity many times over, of e.g. the superheaters, is an effective way of dealing with the problems normally resulting from a transition to cheaper fuels.
Halved time for sootblowing and production stoppages
In the case of many boilers, the furnace load has to be reduced during sootblowing in order to be able to handle the increase in flue gas caused by sootblowing.
The High Impact Soot System halves the costly time needed for sootblowing by means of its unique overlapping sootblowing.
During HISS sootblowing, the operation of the sootblowers overlaps, which halves the timer needed for a sootblowing sequence.
Reduced tube wear
A common problem during steam sootblowing is erosion on the tubes. Sharp particles of flue gas are accelerated to supersonic speed by the jet of steam, which results in tube wear similar to that caused by blasting. Tube damage is very costly in terms of both repairs and production shortfalls, and is one of the reasons for not increasing sootblowing using conventional technology.
SootTech’s HISS technology makes it possible to halve the time the sootblowers apply steam to the tubes but with the same soot cleaning result.
Less corrosion from ash and chlorine
Burning simpler fuels such as waste fuel increases the amount of chlorine in the ash. Long operating times between sootblowing sequences concentrates the amount of chlorine in the ash, which reduces the stycky temperature and increases corrosion. A simple and often recommended method for dealing with corrosion on cold heat surfaces is to sootblow more often.
With HISS sootblowing, the surfaces can sootblow more frequebnly, without increasing the time taken,or increasing steam consumption.
Adding waste fuel increases the amount of chlorine in the ash. Problems posed by time-dependent chlorine concentration, a lowering of the melting point and the pH value can be reduced by sootblowing more often.