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 pressure waves. The pressure waves are created by a shock combustion of a mixture of burnable gas (Natural Gas or Methane) and pure oxygen. Contrary to manual processes, this shock-combustion is carried out automatically and outside of the boiler, in an pressure resistant device. The resulting supersonic pressure wave is introduced into the boiler by means of a valve and a discharge tube. The combustion gas, the boiler tubes and walls are put into a short oscillation, similar to a rapping system, so that deposits are cleaned off. The following steps are performed during one cycle for the EG10 type series:

1

Filling

After release by the control, the dosing tanks of the Shock Pulse Generator are filled with Oxygen and Natural Gas. The two gases remain completely separated from each other and are not ignitable.

2

Transfer

The piston is pressed against the valve seat by Nitrogen pressure and closes the discharge opening gastight. By opening the transfer solenoid valves, the two gases flow through the transfer valves, non-return valves and flame backstroke barriers into the combustion chamber, where they are mixed and therefore ignitable.

3

Ignition

The combustion is ignited by a glow plug. The pressure increase in the pre combustion chamber to approx. 350 bar moves the piston backwards. The piston therefore opens the discharge and the supersonic shock pulse of the main combustion chamber is introduced into the boiler.

4

Shock Pulse

The discharge nozzle transfers the shock pulse into the boiler, where it propagates first linear, then spherical. Flue gas, boiler tubes and walls are put into a short oscillation, so that deposits are cleaned off.The effective depth and cleaning effect can typically cover up to 10 m, with best cleaning results for boiler tubes and walls capable of oscillation.

5

Closing of value

After the pressure wave was discharged from the Shock Pulse Generator, the piston is pressed against the discharge opening by the Nitrogen gas spring and closes the generator gas tigth. The Shock Pulse Generator is then ready for the next pulse cycle.

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 pressure waves. The pressure waves are created by a shock combustion of a mixture of burnable gas (Natural Gas or Methane) and pure oxygen. Contrary to manual processes, this shock-combustion is carried out automatically and outside of the boiler, in an pressure resistant device. The resulting supersonic pressure wave is introduced into the boiler by means of a valve and a discharge tube. The combustion gas, the boiler tubes and walls are put into a short oscillation, similar to a rapping system, so that deposits are cleaned off. The following steps are performed during one cycle for the Twin type series:

1

Filling

After release by the control, the Shock Pulse Generator is filled with Oxygen and Natural Gas. The two gases are mixed during filling by means of a static mixer.

2

System Tightness Test

The two pistons are pressed against the valve seats by Nitrogen pressure and close the discharge openings gastight. The two gases are in the combustion chamber in a mixed state and hence combustible. The complete system is tested for gas tightness by the PLC. The filling valves are closed.

3

Ignition

The combustion is ignited by a glow plug. The pressure increase in the pre combustion chamber to approx. 350 bar moves the pistons backwards. The pistons therefore open the discharge nozzles and the supersonic shock pulses of the main combustion chamber are introduced into the boiler where they overlapp.

4

Shock Pulse

The discharge nozzles transfer the shock pulses into the boiler, where they overlap and then propagate first in a linear, then in a spherical manner. Flue gas, boiler tubes and walls are put into a short oscillation, so that deposits are cleaned off. The effective depth and cleaning effect can typically cover up to 10 m, with best cleaning results for boiler tubes and walls capable of oscillation.

5

Closing of value

After the pressure waves were discharged from the Shock Pulse Generator, the pistons are pressed against the discharge openings by the Nitrogen gas spring and close the generator gas tigth. The Shock Pulse Generator is then ready for the next pulse cycle.

Design

Shock Pulse Generators are manufactured in Switzerland, from special high pressure and high temperature resistant stainless-steel qualities and other high quality components. Quality assurance includes hydrostatic pressure tests as well as explosion tests. Shock Pulse Generators are CE-certified as pressure equipments of Category II and III respectively. The Shock Pulse Generator is available within two different type series, the EG10 and the Twin type series. A design description of both type series as well as a table with technical information can be found in the following picture series.

Design series EG10

Design series Twin

Technical Data