Swiss Shock Pulse Generator (SPG) manufacturing firm, Explosion Power, has added a new TwinL product to its automated online boiler cleaning technology range.
The company said that the device features a higher shock pulse intensity with increased impact depth to cover requests to apply its technology boilers with large pass widths such as coal-fired power plants or waste incinerators.
In autumn last year the TwinL technology was installed at the lower part of the 2nd radiation pass Zurich-Josephstrasse waste to energy plant (cf. Fig. 1).
The firm explained that the 52 tonne per hour four-pass boiler has a radiation pass width of 7.2m and processes up to 13.25 t/h of waste, including up to 15% sewage sludge.
A maximum flue gas temperature of 700°C should not be exceeded at the inlet of the horizontal pass in order to prevent excessive corrosion rate of the superheater tubes.
According to Explosion Power, prior to the installation of the Shock Pulse Generator the flue gas temperature at the inlet of the horizontal pass reached the critical value of 700°C less than one month after the boiler start up.
In order to avoid a further increase of the temperature, a shower cleaning and a manual online boiler cleaning was carried out, but the required cleaning periods were said to have become shorter and shorter.
After the installation of the Shock Pulse Generator, the company said that the flue gas temperature at the inlet of the horizontal pass increased in the first month to 600°C but could then be kept within 600 to 650°C for the rest of the four months operating period.
Further to the reduced flue gas temperature and therefore lower corrosion rate at the superheater bundles, Explosion Power said that the previously required manual online cleaning at the horizontal pass could be reduced from three to one intervention per six months of operation.
Finally the reduction of the flue gas temperature allows overload operation of the boiler during periods with peak demand of the district heating.
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