DE202016100216U1 - Furnace insert for exhaust gas treatment - Google Patents

Abstract

Aftertreatment insert for a post-treatment heater insert, comprising a housing having an inlet for exhaust gases from the heating insert, an outlet for exhaust gases allowing connection to the chimney, characterized by at least two groups of pall rings arranged in the housing such that the Exhaust gases are first passed through the first group and then through the second group, wherein the exhaust gases are thereby deflected by at least 45 degrees to enter after emerging from the first group of Pall rings in the second group of Pall rings.

Description

The invention relates to an oven attachment or furnace insert for exhaust gas treatment, in particular a cap or insert, which is arranged between the stove / fireplace insert and the exhaust pipe.

Field of the invention:

The previously available systems for reducing combustible dust and gaseous pollutant components in small combustion plants are based on the catalytic principle of action or on the filtration principle. These systems are installed either within the combustion plants or outside the combustion plants or downstream in exhaust systems as an insert.

Recently, a variety of different catalytic exhaust treatment systems have been developed for use in small combustion plants, for the treatment of combustible, dust and gaseous pollutants (soot, CO, CnHm, PAK, etc.), which are not to be described in detail here. Catalytic emission control systems sometimes have the problem of damaging the catalytic converter over time and adversely affecting its function.

A number of non-catalytic emission control systems have also been developed. The non-catalytic exhaust gas purification systems which are to be installed in the small combustion plant or in the connecting piece are usually based on the principle of a storage filter. In this case, a foam structure is used, which can also be catalytically coated. On and in the foam structure, the dust-like pollutants are to be separated and burnt free upon reaching favorable temperatures. The inorganic constituents remain in the foam structure, which must be manually cleaned from time to time due to the increase in flow resistance.

In the DE 10 2013 210 985 A1 It has been recognized that a small combustion plant with an installation is to be provided, which causes a mixture of combustible exhaust components with combustion air and has a heat capacity, which prevents a drop in temperature below a desired minimum temperature by a temporarily lowered combustion performance. The mixing should generally be fine. Mostly, mixing is achieved with the benefit of microturbulence. The heat capacity of the installation is a prerequisite for storing a sufficient amount of energy in the form of heat. It is also necessary that the energy is absorbed quickly and delivered quickly. The desired minimum temperature is usually the minimum oxidation temperature, which is about 150 degrees Celsius.

The object of the invention is to provide a small combustion plant, which enables low-emission operation with the least possible effort.

Overview of the invention:

The fireplace insert and the chimney are directly connected by an exhaust pipe. In the following, heating insert, fireplace insert and oven insert or fireplace cassette, boiler are used synonymously and thus represent synonyms, since it is about the basic structure of a component, which is then installed in or on the fireplace insert. A fireplace insert is a cast iron or sheet steel component with a combustion chamber for solid, liquid or gaseous fuels; which can also be heat exchangers for the heat transfer medium at the same time. Often these have a viewing window or a front panel or front door, it closes off the heating chamber to the operating side. A stovepipe establishes the connection between fireplace insert and chimney draft or chimney.

The buoyancy in the chimney ensures, depending on the structural conditions, that a corresponding negative pressure in the combustion chamber of the fireplace insert acts and the exhaust gases are discharged through the chimney.

According to the invention, the after-treatment exhaust after-treatment insert for a heating insert comprises a housing with an inlet for exhaust gases from the heating insert, an outlet for exhaust gases, which allows a connection to the chimney. This post-treatment insert is characterized by at least two groups of Pall rings, which are arranged in the housing, that the exhaust gases are first passed through the first group and then through the second group, the exhaust gases are thereby deflected by at least 45 degrees to emerging from the first group of Pall rings in the second group of Pall rings.

By arranging several groups, it can be achieved that the exhaust gases have to travel as far as possible through the aftertreatment insert, in which case the temperature is lowered and in the Pall rings a corresponding oxidation takes place, which is introduced from 150 degrees. The grouping into groups of Pall rings also allows an adjustment of the number of Pall rings within the aftertreatment insert and its housing, so that an adaptation for different performances of a heating insert in the production of the heating insert can be done. The aftertreatment insert must therefore be easily adapted only inside by changing the positive guidance of the exhaust gases. The positive guidance is achieved by means of appropriate metal sheets, partition walls and bearing surfaces. The housing has corresponding grooves or holes, which make it possible that the sheets or partitions and support surfaces are configured depending on the application and performance of the heating element.

In a preferred embodiment, the exhaust gases are deflected by appropriate arrangement of the Pall ring groups by 90 or 180 degrees.

The housing is preferably box-shaped and has means to be fastened in the upper area of the heating insert. Thus, existing heaters can be easily retrofitted because the outlet of the housing may be configured to be congruent with the original outlet of the heater. By appropriate tabs, guides or holes, the housing can be mounted in the upper area, above the fire in the heating approach.

A group of Pall rings consists of one or more rows of Pall rings, which are preferably arranged on a plane so that their exhaust gas passage axes are parallel to each other. It is also conceivable that only a number of Pall rings is given. The number of Pall rings or the arrangement in rows also depends on the amount of gases that are generated in the combustion chamber of the heating element. It is also conceivable that 4-sided or round structures of the abutting Pall rings are used.

In the figures, which are described below, two embodiments of the invention are shown, in one embodiment, at least 3 groups of Pall rings are arranged in the housing, the exhaust gas passage axes are each rotated by at least 90 degrees to each other.

In a further embodiment, at least 2 groups of Pall rings are arranged in the housing, the exhaust gas passage axes are each rotated by at least 180 degrees to each other. It should be noted that any other arrangement of groups of Pall rings is possible.

Within the housing, the exhaust gases, as already described above, forcibly guided by the groups of Pall rings by means of baffles, center walls and / or support plates. It should be noted that the exhaust gases are routed as possible to the top of the housing and are guided horizontally there so that they can still give off heat to the housing and the housing then transfers the heat to the environment.

In one possible embodiment, the housing is designed in such a way that the baffles, center walls and / or support plates can be variably arranged in order to match the performance of the heating insert. This is achieved by corresponding grooves or holes or guides within the housing, through which the baffles, middle walls and / or support plates can be arranged and the performance of the heating element can be adjusted.

In a further embodiment, the support plates are formed with openings, so that the Pall rings rest only in the edge region, so that the exhaust gases flow through the apertures along the exhaust gas passage axis through the pallet rings. Through these support plates, it is ensured that the Pall rings are fixed within the housing and retain their position.

In the preferred embodiment, the inlet for the exhaust gases is directed down to the firebox of the heating element. This ensures that the exhaust gases enter the case as easily as possible to quickly reduce their heat and speed.

The pall-ring is a ceramic ring or ring made of hard porcelain, which is constructed tubular, preferably having openings on the tube wall and preferably structures which extend from the side wall into the interior of the tube. In such a ring is thus a hollow cylinder. In other possible embodiments, structures are also formed within the hollow cylinder which are similar to blades facing inward. Outside are usually holes. The blades and holes make the impression that the blades are formed as it were at the locations of the holes as inwardly curved wall of the hollow cylinder. Such Pall rings are commercially available (e.g., from Raschig and König) and can be assembled into a device having the above-described characteristics and advantages.

When the exhaust gases enter the aftertreatment insert, the high temperatures, the structure and the arrangement of the Pall rings ensure that the exhaust gases are swirled. The post-treatment use and the arrangement of the Pall rings and their temperature promote the oxidation between carbon and oxygen. In the entry area of the aftertreatment insert temperatures of the furnace temperature or the exhaust gas temperature are reached. In the further course, the exhaust gas temperature is reduced, so that the Outlet temperature of the exhaust gases from the aftertreatment insert is significantly lower than the inlet temperature. However, the temperature is kept long, so that fluctuations are compensated and a continuous oxidation is given.

During combustion in the combustion chamber of the fireplace insert, the exhaust gases are thereby routed through the aftertreatment insert to the chimney. The inlet and outlet of the exhaust gases from the combustion chamber is only possible via the aftertreatment insert and the exhaust gas heats the aftertreatment insert in the inlet region to the respective combustion chamber temperature. The extended exhaust path and the concomitant pressure drop causes the exhaust gas residence time in the combustion chamber of the fireplace insert to be prolonged and the oxidation of carbon with oxygen in the combustion chamber to be improved.

By the post-treatment use a significant oxidation of the carbon / oxygen and beyond an increase in the efficiency is achieved.

Brief Description:

• In the following, the figures will be described briefly, which will be discussed later in the detailed description.

It shows:

1 a section through a heating insert, with a fire area and a post-treatment insert having Pall rings;

2A to 2E show a detailed structure of the post-treatment use from different perspectives and with different cuts;

3A to 3E show an alternative construction of an aftertreatment insert from different perspectives and with different cuts;

4A and 4B show a pall ring from above and the side with the corresponding recesses in the side walls of the pall rings and the structures extending into the interior of the pall ring;

Detailed description of the embodiments:

The 1 shows a detailed structure of a heating insert 1 which is provided with a glass door. The cut is done in the vertical by the heating insert, so that the firebox with its fireclay and the air supply from below into the combustion chamber is visible. The fire, not shown, generates hot exhaust gases, indicated by the arrows 3 being represented. The hot exhaust gases are passed through an aftertreatment insert 4 guided. The aftertreatment insert has a box-shaped housing having an inlet 7 and an outlet 8th having. Through the inlet 7 The exhaust gases enter the aftertreatment insert and pass through Pall rings 6 in groups of Pall rings 9 and 10 . 11 are arranged, guided. After the exhaust gases have passed through the aftertreatment insert, they enter the stovepipe 2 Derived to the fireplace.

The 2A shows a first embodiment of a post-treatment use 2 from above. Significantly, the mounting holes can be seen on the side areas, which allow attachment by screws in the heating approach.

The 2 B shows the post-treatment use 2 from below with the appropriate holes through which the hot exhaust gases can flow into the treatment. The inlet 7 immediately introduces the hot air into the first group of Pall rings 9 ,

The 2C shows a perspective view of the housing of the aftertreatment insert. Also clearly visible are the grooves in which the baffles 13 and support plates 14 being held.

The 2D shows a section through the aftertreatment insert 4 and its housing. It can be clearly seen that 2 groups of Pall rings 9 . 10 are present, each comprising 2 parallel rows of Pall rings. The exhaust gases flow from below through the inlet 7 , are then diverted by 180 degrees and then flow from above through the second group 10 from Pall rings back down, then out of the outlet 8th withdraw. The groups of Pall rings are made by baffles, middle walls 13 and support plates 14 held. The support plates have only small bearing surfaces on which rest the walls of the Pall rings. They allow the exhaust gases to flow through the pall rings and through the recesses in the support plates.

The 2E shows an aftertreatment insert with the lid removed at the top. The lid is held by screws, as well as off 2D can be seen. With this structure, it is possible to make the interior of the post-treatment use variable and adapt to the performance of the heating element. The higher the power of the heater insert, the greater the number of Pall rings and also the exhaust system is extended accordingly.

The 3A shows an alternative embodiment with three groups of Pall rings 9 . 10 . 11 , 3A shows a plan view with the outlet 8th , The 3B shows a view from below with the inlet 7 , The 3C shows a perspective view with the outlet 8A. The 3D shows a sectional view in which it can be seen that the exhaust gases only through a first group 9 Pall rings, which are only formed einreihig, and are then deflected by 90 degrees, and then through the second group of Pall rings 10 to be guided. Then the exhaust gases enter through lateral openings of the Pall rings in the interior of the Pall ring, and then up over the outlet 8th be led out of the post-treatment use.

The 3 shows a post-treatment insert from above with the lid open.

The 4A and 4B show once a Pall ring from the side with a large number of openings in the side wall. Often, the areas of the sidewall that are missing due to the apertures are led into the interior of the pallet. This can be done in 4B You can see here that some areas of the wall of the Pall ring extend into the interior of the Pall ring.

LIST OF REFERENCE NUMBERS

1

 heater

2

 Stovepipe to the fireplace

3

 Arrows that determine the flow direction of the hot air

4

 post-treatment use

5

 casing

6

 Pall Ring

7

 inlet

8th

 outlet

9

 first group of Pall rings

10

 second group of Pall rings

11

 third group of Pall rings

12

 Grooves for baffles

13

 Baffles, middle walls

14

 bearing plates

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013210985 A1 [0005]

Claims (13)

Aftertreatment insert for a post-treatment heater insert, comprising a housing having an inlet for exhaust gases from the heating insert, an outlet for exhaust gases allowing connection to the chimney, characterized by at least two groups of pall rings arranged in the housing such that the Exhaust gases are first passed through the first group and then through the second group, wherein the exhaust gases are thereby deflected by at least 45 degrees to enter after emerging from the first group of Pall rings in the second group of Pall rings. Aftertreatment insert according to the preceding claim, characterized by an arrangement of the groups of the Pall ring in the housing so that the exhaust gases are deflected by 90 or 180 degrees before the exhaust gases pass from one group of Pall ring to a second group of Pall ring , A post-treatment insert according to one or more of the preceding claims, wherein the housing is box-shaped and has means to be fastened in the upper region of the heating insert. A post-treatment insert according to one or more of the preceding claims, wherein a group of Pall rings consists of one or more parallel rows of Pall rings, which are preferably arranged on a plane so that their exhaust gas passage axes are parallel to each other. A post-treatment insert according to one or more of the preceding claims, wherein at least 3 groups of Pall rings are arranged in the housing, the exhaust gas passage axes are rotated by at least 90 degrees to each other. A post-treatment insert according to one or more of the preceding claims, wherein at least 2 groups of Pall rings are arranged in the housing, the exhaust gas passage axes are rotated by at least 180 degrees to each other. Aftertreatment insert according to one or more of the preceding claims, wherein the exhaust gases are forced through the groups of Pall rings by means of baffles, center walls and / or support plates within the housing. A post-treatment insert according to one or more of the preceding claims, wherein the housing is formed such that the baffles, center walls and / or support plates are variably locatable to match the performance of the heating element. Post-treatment insert according to one or more of the preceding claims, wherein the support plates are formed with openings, so that the Pall rings rest only in the edge region, so that the exhaust gases flow through the openings along the exhaust gas passage axis through the pallet rings. A post-treatment insert according to one or more of the preceding claims, wherein the inlet for the exhaust gases is directed downwards to the firebox of the heating element. A post-treatment insert according to one or more of the preceding claims, wherein the exhaust gases are horizontally deflected within the housing and transported to the outlet at the top of the housing. A post-treatment insert according to one or more of the preceding claims, wherein the pallet ring is a ceramic ring of tubular construction, preferably having apertures on the tube wall and preferably structures extending from the side wall into the interior of the tube. A heating insert comprising an aftertreatment insert according to one or more of the preceding claims.

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