Shock Pulse Generator (SPG) Boiler Cleaning Equipment
The Shock Pulse Generator (SPG), developed and manufactured by Swiss company Explosion Power GmbH, is an online boiler cleaning equipment automatically generating Shock Pulses (SP) by pressurized gas combustion. The innovative technology has proven its outstanding performance at worldwide more than 800 different installations in 20+ countries since 2009. Plant operators confirmed significant prolongation of boiler operating periods and increased efficiency, thus contributing to a sustainable and economic plant operation. Leading plant suppliers decided to apply SPG-technology to new build plants, additionally profiting from the sophisticated system design and the compact geometry.
SPGr System Components
The Shock Pulse Generator system consists of the following components:
- Shock Pulse Generator, mounted at a boiler nozzle. The Shock Pulse is injected into the boiler through a discharge nozzle. The boiler nozzle can also be mounted at a manhole.
- Control cabinet, controls the Shock Pulse, connected to the process control system (PCS).
- Pressure regulating lines, reduce cylinder pressure to 40 bar.
- Valve panel, assembly of valves, pressure transmitter and terminal box
- Air Compressor Unit: supply for combustion air; integrated in SPG LogView
Functional Sequence
The Shock Pulse Generator was developed in 2009 and since then has proven its outstanding performance. As with manual explosion cleaning processes, the Shock Pulse Generator cleans the boiler by shock waves. The shock waves are created by fast combustion of a mixture of burnable gas (Natural Gas or Methane) and air. Contrary to manual processes, the combustion is carried out automatically and outside of the boiler, in a pressure resistant device. The resulting supersonic shock wave is introduced into the boiler by means of a valve and a discharge nozzle. The combustion gas, the boiler tubes and walls are put into a short oscillation, so that deposits, i.e. slag and fly ash, are cleaned off.
Function and Cleaning Effect
The following steps are performed during one cycle:
- Filling of combustion chamber with methane / natural gas and air
- Mixing of gases in combustion chamber
- Ignition by glow plug
- Opening of piston, releasing discharge valve
- Injection of shock pulse into the boiler
- Short shock pulse cleans heating surfaces, removing slag and fly ash
- Mild boiler cleaning without damage to boiler tubes
Field of Application
Fields of application of the Shock Pulse Generator-Technology are:
- Waste to Energy plants (incl. refuse derived fuel boilers)
- Industrial boilers (biomass / various fuels)
- Sludge incineration plants
- Hazardous waste incineration plants (incl. chemical plants)
- Waste heat boilers (coking plants, metallurgic factories etc.)
- Coal fired power plants
- Black liquor boilers
- Filters and spray absorbers
- Cement plants
Benefits
Boiler cleaning by means of Shock Pulse Generators means:
- Permanent and automated boiler cleaning, thus lower exhaust temperature and higher boiler efficiency, improved CO2 plant performance
- No steam consumption, no thermal abrasion or damaging of boiler tubes
- Higher plant availability by longer boiler traveling period, less cleaning needs during maintenance stops
- Reduction of heat transfer surface area for same steam capacity
- Saving of boiler house volume by reduced space requirement
- Investment cost saving by reduced number of cleaning devices
- High degree of operational safety – boiler remains closed during operation
- Quick and easy installation by modular and compact type series
- High industrial standard (CE-certification based on Pressure Equipment Directive, clearly defined ATEX zones, PLC system monitoring, PROFIBUS/MODBUS compatible)
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