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MSW Boiler Lucerne (Perlen)

Switzerland

Overview

  • 2 boilers with 58 t/h steam flow per unit, since 2015.
  • Capacity increase to 70 t/h in 2020 (120% of the original design)
  • Boiler width 5.5 m
  • 6x Shock Pulse Generator EG10L, since 01/2015 (3 per boiler), enable to maintain a constant RG temperature at the inlet to the horizontal pass, even at 70 t/h steam capacity. From July 2022 on line 1 3x SPGr10.
  • 6x Shock Pulse Generator SPGr10, since 08/2021 (3 per boiler), enable to prevent strong increase of pressure drop in the horizontal pass and to achieve long travel time. Common operation with the existing rapping system.
  • Plant supplier: Hitachi Zosen Inova
  • Plant operator: Renergia
boiler graphic installation Shock Pulse Generator msw boiler Perlen

Planned installation from July 2022

  • On Line 1, the three EG10L in the radiation pass will be replaced by three SPGr10 in June 2022
  • Thereafter operation of six SPGr10
  • Further optimization of cleaning performance by means of mixed mode adjustment, based on weekly analysis of boiler operating data
  • Reduction of operating and maintenance costs
  • Standardization of the systems with regard to operation and data exchange with PLS
  • The same conversion is planned for 2023 on line 2
  • The combustion air for the 12 SPGr10 is provided by an air compressor unit ACU260-80-2
boiler graphic new installation Shock Pulse Generator msw boiler Perlen

3x EG10L enable low inlet temperature into horizontal pass, even after capacity increase

Diagram low inlet temperature due to Shock Pulse Generator
Figure for 4.5 years

Black: Shock pulses/day of EG10L in 1st pass; Red: Shock pulses/day of EG10L in 2nd pass,

Blue: Shock pulses/day of EG10L in the 3rd pass;

Green: Flue gas temperature before EVAP2, left side; Purple: FGT before EVAP2, right side;

Gray: Life steam flow

Brown: Shock pulse/day of an SPGr10, testwise installation for comparison

Result:
The SPGs enable a low flue gas temperature at the inlet of the horizontal pass, even after the capacity increase of the boiler (measurement at inlet EVAP2-SH3, at outlet of small evaporator bundle EVAP1).

By adjusting the shock pulses/day, even lower FG temperatures could be achieved.
Additional optimizations with mixed mode operation of the SPGs are currently carried out.

Line 1: Significantly lower RG pressure drop, by means of three SPGr10, together with tapping.

Diagram lower RG pressure drop due to Shock Pulse Generator
Operating data for line 1 during five years

Black: Steam flow
Red: Flue gas pressure drop VD2-ÜH3
Blu: Flue gas pressure drop ÜH2.2
Green: Flue gas pressure drop ÜH2.1
Purple: Sum of Converted Energy/day of three SPGr10 in horizontal pass

3x SPGr10 & rapping can reverse the increase of flue gas pressure drop in critical SH bundle

Diagram Shock Pulse Generator reverses the increase of flue gas pressure drop
Detailed diagram for line 1 for six months (zoom from previous page)

Black: Steam flow
Red: Flue gas pressure drop EVAP2-SH3
Blue: Flue gas pressure drop SH2.2
Green: Flue gas pressure drop SH2.1
Purple: Sum of Converted Energy/day of three SPGr10 in horizontal pass

3x SPGr10 & rapping can keep flue gas pressure drop continously low at line 2

Diagram Shock Pulse Generator can keep flue gas pressure drop continously low
Detailed diagram for line 2 for six months, whereof four months after boiler maintenance

Black: Steam flow
Red: Flue gas pressure drop EVAP2-SH3
Blue: Flue gas pressure drop SH2.2
Green: Flue gas pressure drop SH2.1
Purple: Sum of Converted Energy/day of three SPGr10 in horizontal pass

Impressions of the reference plant

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