DE8516607U1 - Device for returning exhaust gases from a heating boiler to the burner - Google Patents

Description

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G 16-373 TP / F / Tue "

Device for returning exhaust gases from a heating boiler to the burner

The innovation relates to a device for returning i exhaust gases from a heating boiler to the burner for the purpose of reduction. the formation of nitric oxide.

\ There is a general requirement that nitric oxide formation

I for forced draft burners in heating systems. To the-

For this purpose it has already been proposed to remove exhaust gases from the end of the boiler

I to the burner and this with the combustion air

mix | r. This makes the bonding temperature clear reduced, which leads to a reduction in nitric oxide formation

£ leads.

In the previously proposed devices for returning A flow channel leads from the exhaust gas collector to the exhaust gases

I along the outer wall of the boiler towards the burner. This Flow channel is installed at the construction site. Afterward

It is to be insulated so that excessive undercooling of the ξ gees with possible condensation does not occur.

.1 It should be a particularly favorable arrangement of the flow channel ί can be made.

1 The device according to the innovation is characterized by

'' one leading from the exhaust manifold to the burner, the water space of the boiler through the flow channel. Since the flow channel is in the water space of the boiler, it can be assembled in the factory. Subsequent assembly and insulation at the construction site can be omitted. It is not additional, outer pipe available, daj disturb and possibly damaged. The arrangement in the water room leads

H also leads to a defined, further cooling of the exhaust gases.

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This is very advantageous because of the formation of nitrogen oxide the colder the recirculated exhaust gas, the lower it is is. The hot boiler water separates condensate from the flue gas. however prevented.

In the case of a heating boiler with a horizontal combustion chamber, the flow channel should cross the lower area of the water space. In the case of a sectional boiler, it can be guided through the lower hub.

The attached drawing represents a sir.sr sinsigsn figure Longitudinal section through a heating boiler as an embodiment of the innovation.

The heating boiler has a burner 2 on a front door 1, the flame of which extends into a reverse combustion chamber 3 extends into it. After the reversal, the heating gases flow through heating gas pipes 4, only one of which is shown, and arrive at the exhaust gas collector 5. A flow channel 6 leads from the exhaust gas collector 5 back to the burner 2. This flow channel 6 crosses the water space 7 in the longitudinal direction like the heating gas pipes and conducts exhaust gases to Burner 2.

Claims (3)

BUDERUS AKTIENGOSEtliSCHitFiJ I G 16-373 TP / F / Di protection claims 1. Device for returning exhaust gases from a heating boiler to the burner for the purpose of reducing nitrogen oxide formation , characterized by a flow channel (6) leading from the exhaust gas collector (5) to the burner (2) and traversing the water space (7) of the heating boiler. 2. Device according to claim 1, characterized in that the flow channel is the lower Crossed the area of the water space (7) of a heating boiler with a horizontal combustion chamber (3). 3. Device according to claim 1, characterized in that the flow channel is the lower Crossed through the hub of an articulated boiler, 4 * · ■ ι it · · it tit tit t «