Heat exchange – Regenerator – Heat collector
Reexamination Certificate
2001-02-09
2003-09-23
Atkinson, Christopher (Department: 3743)
Heat exchange
Regenerator
Heat collector
C165S008000, C165S005000, C165S006000, C422S168000, C422S173000, C432S180000
Reexamination Certificate
active
06622780
ABSTRACT:
The invention relates to a method for thermally regenerating the heat exchanger material of a regenerative post-combustion device, which in a housing comprises from top to bottom:
a) a combustion chamber;
b) a section, which is divided into several segments filled with heat exchanger material;
c) a rotary distributor having a direction of rotation, which according to its rotary position produces:
ca) a connection between an inlet for a waste gas to be purified and a first segment of the heat exchanger material;
cb) a connection between a second segment of the heat exchanger material and an outlet for the purified gas;
cc) a connection between the third segment of the heat exchanger material, which segment is ahead of the second segment in the direction of rotation of the rotary distributor, and an inlet or an outlet for flushing gas;
in which method air is heated in the combustion chamber, is removed from this, adjusted to the desired regeneration air temperature using fresh air, and is routed successively through all segments of the heat exchanger material, due to which the heat exchanger material is brought to a temperature at which contaminants adsorbed by the heat exchanger material are released.
Regenerative post-combustion devices are used to purify contaminated waste gases from industrial processes. To conserve energy on thermal post-combustion, the waste gases to be purified are led through heat exchanger material. Since the waste gases to be purified often contain organic contaminants in the form of condensable substances, e.g. tar products, or organic dust, the surfaces of these heat exchanger materials become clogged with these contaminants in the course of operation. To regenerate it, the heat exchanger material has to be heated periodically to a temperature at which the contaminants absorbed by the surface are released and can be removed. This takes place in known thermal post-combustion devices in that fresh air is introduced into the combustion chamber, heated there to high temperature and then conducted from the top downwards through the heat exchanger material, routed via the rotary distributor to the outlet and then removed to the outside atmosphere via the chimney. The rotary distributor is stationary in this process. It is waited until the segment of the heat exchanger material flushed through in each case has been heated from top to bottom to the required temperature, so that all areas of the heat exchanger material in this segment are freed of contaminants. The rotary distributor is then rotated by one segment, and the process commences afresh. What is disadvantageous about this known method for regenerating heat exchanger material is on the one hand the relatively long time required to clean all segments. In addition, the gas routed to the chimney contains the contaminants released from the heat exchanger material, and is thus not clean.
The object of the present invention is to configure a method of the type specified at the beginning so that thermal regeneration takes place quickly and in addition no contaminants are released into the ambient atmosphere.
This object is achieved according to the invention in that the air used for thermal regeneration and heated in the combustion chamber is removed from the combustion chamber and returned to the inlet for waste gas to be purified, while the outlet for purified gas is closed, and this air is circulated with the rotary distributor rotating until all the heat exchanger material has been sufficiently heated and all contaminants have been released from this.
Due to the recirculation of the heated air to the inlet provided according to the invention, two things are achieved:
On the one hand, the segment of heat exchanger material acted upon in each case is heated from underneath, i.e. from a side which is normally relatively cool, as it is far removed from the combustion chamber. Uniform heating of the heat exchanger material in the segment can thus be achieved more quickly than if this segment was acted upon with hot air from the combustion chamber. On the other hand, in the process according to the invention, the air which carries the contaminants released from the heat exchanger material is introduced into the combustion chamber, where these contaminants are combusted and thus rendered harmless. Thus only air which is completely free of contaminants is released into the environment via the chimney.
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