Combustion – Heated line section feeds flame holder – Housing encloses heated section and flame area
Patent
1995-10-30
1998-01-20
Yeung, James C.
Combustion
Heated line section feeds flame holder
Housing encloses heated section and flame area
431 5, 431 11, 431215, 431243, 431247, F23D 1144
Patent
active
057095426
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the combustion of oxidizable constituents in a carrier gas to be cleaned, comprising a gas inlet, a burner with attached flame tube, which opens into a main combustion chamber comprising bottom and side walls, a combustion chamber outlet preferably on the side wall opposite the bottom wall of the main combustion chamber, a heat exchanger and a gas outlet.
In addition, the invention relates to a method for the combustion of oxidizable constituents in a carrier gas which is to be cleaned in a device consisting of a main combustion chamber starting from a flame tube and limited by bottom and side walls, in which cleaned gas is diverted from the bottom wall in the direction of a combustion chamber outlet placed coaxially radially or tangentially with respect to the flame tube.
A device of the type described above can be seen in EP 0 235 277 B1. The flame tube of this device, which is termed a high-speed mixing chamber, opens into the main combustion chamber, cross section of which is larger than the free the cross section of flow in the high-speed mixing chamber. The main combustion chamber extends on the outside along the high-speed mixing chamber, which is in the form of a tube. It then changes into a ring-shaped channel running coaxially to the high-speed mixing chamber, which is in the form of a tube. It then changes into a ring-shaped channel running coaxially to the high-speed mixing chamber, which itself changes into a further channel-type annular space also placed around the high-speed mixing chamber and partly around the ring-shaped channel. A heat exchanger is located in the annular space whose tubes are bent outwards at their colder ends.
In other known systems, the main combustion chamber, the flow section of which is also larger than that of the high-speed mixing chamber, extends completely along the high-speed mixing chamber and then preferably ends radially in a heat exchanger, which is preferably arranged in a ring-shaped channel.
Installations in which the heat exchanger is accomodated in a seperate housing are also known.
In all these known combustion systems, the gas leaves the high-speed mixing chamber in the form of a free jet. This jet impinges on the bottom wall of the main combustion chamber and is distributed there in a rotationally symmetrical manner corresponding to the flow geometry of the baffle plate flow. High centrifugal forces cause the gas to flow both along the bottom wall and, after a further diversion, like a ring jet axially along the inside surface of the side wall of the combustion chamber. The cross section surface of this ring jet along the side wall of the main combustion chamber up to the combustion chamber outlet increases only slightly, so that a stationary vortex area forms between the ring jet and the outside wall of the high-speed mixing chamber. This results in less than optimum utilization of the main combustion chamber, because of the very wide residence time distribution of the gas as a result of vortex formation. This means that the minimum residence time of the gas in the main combustion chamber is considerably less than the theoretical residence time, which is calculated as the quotient of the volume of the main combustion chamber and the gas flow in it.
From FR-A-2 248 470 it is known a device for burning oxidizable constituents in a carrier gas to be cleaned, which is in line with EP 0 235 271 B1 except that the combustion chamber has profile rings outside both to hold back material which cannot be burnt and to increase as much as possible the residence time of the solid particles which can be burnt. This results in the formation of stationary turbulences in the section of the profile rings, thus causing a reduction of the effective cross section of the gases flowing through the combustion chamber. The residence time of the respective gases caused by this requires an increased temperature of the combustion chamber to burn the oxidizable constituents in the carrier gas to the necessary extent.
The present invention i
REFERENCES:
patent: 4850857 (1989-07-01), Obermuller
Rentzel Gert
Saggel Joachim
Grace GmbH
Yeung James C.
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