DE102007010402A1 - Boiler plant and method for operating a boiler plant - Google Patents

Abstract

First (1) and second (2) storage devices for fuel link to a mixer storage device (6) via first (4) and second (5) connecting pipes with controlled seals. The mixer storage device links to a burner (3) via a third connecting pipe (7) and has first (8) and second (9) chambers. The first and second connecting pipes discharge to the first and second storage devices in the first chamber. The third connecting pipe for the burner links to the second chamber. An independent claim is also included for a method for operating a heating boiler installation.

Description

The The invention relates to a boiler plant according to The preamble of claim 1 and a method of operation a boiler plant according to the preamble of Claim 13.

A boiler plant of the type mentioned is according to the DE 195 03 463 A1 known. This consists of several boilers, each with a burner for liquid fuels. In this case, according to the in 2 illustrated embodiment, a total of three storage devices for storing the liquid fuel provided, each burner is hydraulically connected to the memories. The storage tanks or tanks are used in this boiler plant for storing a mineral oil. Under a mineral oil is to be understood in the context of the invention, an oil that has been prepared by distillation of petroleum, oil shale, oil sands or possibly other mineral resources.

Of the Invention is the object of a boiler system of initially mentioned type and a corresponding method for operation develop such a system to the effect that with this or this so-called biogenic fuels are burned can, with virtually no costly conversion or Readjustment of the burner.

Under a biogenic fuel is in the context of the invention and unlike the fossil energy source mineral oil (which in the strict sense is actually also biogenic) a relatively fast Renewable source of oil understood, so to Example vegetable oils or fatty acid methyl esters.

These Task is device according to the invention with a boiler system of the type mentioned by the Characteristics listed in the characterizing part of patent claim 1 solved.

To the invention is thus provided in terms of apparatus, that at least one of the storage for storing a biogenic fuel is used, whereby the memory over regulated lockable Connecting lines are connected to a mixing memory and wherein the mixing memory via at least one connecting line connected to the burner.

Procedurally, expressed, is according to the mark of claim 13 provided that at least one of the memory is used for storage of a biogenic fuel, wherein the stored in the stores, liquid fuel first a mixing memory is supplied and there is a (targeted adjustable, predetermined) fuel mixture results, the Fuel mixture then coming from the mixing reservoir the burner is supplied.

With In other words, the invention consists in the core to provide a buffer that holds both mineral oil as well as biogenic fuel is supplied. In this Caching it comes to a mixing of the fuels (the both oils readily mix with each other, d. H. a special mixing device may or may not be provided be). The supply of fuels over the both closable connection lines takes place regulated, d. H. in a certain ratio, so that the burner via the connecting line from the mixing tank ultimately always a fuel mixture is supplied, the from a certain percentage of mineral oil and a given Proportion of biogenic fuel. This ensures that that the fuel mixture supplied to the burner within a tolerance range always has the same viscosity, d. H. a changeover of the burner to another fuel not necessary.

The Boiler plant according to the invention is both as a new installation as well as a retrofit solution imaginable. For example, there is interest in, at a conventional heating system now also biogenic To be able to burn fuel can, by the mixing tank according to the invention and using a storage for storing the biogenic fuel be provided in a relatively simple manner, a plant at the without frequent readjustment of the burner mineral oil and, for example, rapeseed oil are burned at the same time. In what proportion of the two oils can ultimately be consumed over the mixing ratio and the appropriately selected burner setting specified by the manufacturer.

According to a particularly preferred embodiment, which will be explained in more detail below, it is further provided according to the invention that the mixing reservoir has a first and a second chamber, wherein the connecting lines lead to the memories in the first chamber and wherein the at least one connecting line to the burner with the second chamber is connected. In this case, a closable connecting line is arranged for the controlled filling of the second chamber between the first and second chambers, wherein also this connecting line comprises a valve which is connected to a control device. - This provision ensures that the mixture supplied to the burner always has a constant mixing ratio, since the actual adjustment of the mixing ratio is carried out first in the first chamber and only this finished Ge mixed with the second chamber is supplied. If there is a need to refill the first chamber, this in turn is done under the aspect of setting the desired mixing ratio in the first chamber. Since at this moment this first chamber from the burner no fuel is extracted, even slight disturbances of the mixing ratio are safely excluded.

Procedurally, Expressed, characterized this preferred variant thereby from that the liquid fuels coming from the stores mixed together in a first step and in a second step Step fed to the burner, wherein the first step regarding the adjustment of the fuel mixture ratio unaffected by the second step, d. H. the removal of the fuel from the second chamber has no effect on the Mixing ratio of the fuel in the first chamber.

Other advantageous developments of the invention Boiler plant arise from the dependent claims.

The sake of completeness is still on the DE 10 2004 050 602 A1 which discloses a method for verifying at least one predetermined fuel mixing ratio. Although this method also uses two reservoirs (tanks) for different fuels (for example, diesel and vegetable oil), but relates to an injection system for an internal combustion engine, in which moreover not the mixing memory according to the invention is provided.

The including boiler plant according to the invention their advantageous developments according to the dependent claims will be described below the graphic representation of two embodiments explained in more detail.

It shows schematically

1 the basic version of the boiler system according to the invention; and

2 a preferred embodiment of the mixed memory according to the invention.

The boiler system according to the invention consists in all embodiments of a boiler with a burner 3 for liquid fuels and at least two stores 1 . 2 for storage of the liquid fuel. Here are the burner 1 and the stores 2 hydraulically connected to each other and at least one of the memory 1 is used to store a mineral oil (definition "mineral oil" - see above).

For all embodiments, it is essential according to the invention that at least one of the memories 2 for storage of a biogenic fuel (definition "biogenic fuel" - see above) is used, the memory 1 . 2 over regulated lockable connection lines 4 . 5 with a mixed memory 6 are connected and wherein the mixing memory 6 via at least one connecting line 7 with the burner 3 connected is.

Typically this is with reference to 2 the connection line 7 to the burner 3 from a supply line and a return line 13 . 14 Made to remove unused fuel from the burner 3 to the mixed memory 6 to be able to lead back.

Again with reference to 2 is provided according to a particularly preferred embodiment that the mixing memory 6 a first and a second chamber 8th . 9 having, wherein the connecting lines 4 . 5 to the stores 1 . 2 in the first chamber 8th lead out and wherein the at least one connecting line 7 to the burner 3 with the second chamber 9 connected is. Between the first and second chamber 8th . 9 of mixed storage 6 is also a regulated lockable connection line 10 arranged, which is a valve 11 includes that with a control device 12 connected is. The first chamber 8th is preferably, as shown, larger than the second chamber 9 For example, in the case of boiler output up to 50 kW: the first chamber 8th has a volume in the range of 2 to 6 l, while the second chamber 9 has a volume of 1 to 3 liters; for larger boiler outputs accordingly more). This results in this way a comparatively simple, inexpensive, compact, but at the same time reliably providing a specific fuel mixture ratio device which is well suited both for reinstallation and for retrofitting.

To the supply of fuel to the stores 1 . 2 and thus to be able to precisely control the mixing ratio of the fuels to each other, are - how 1 shows - the connecting lines 4 . 5 between the stores 1 . 2 and the mixed memory 6 each with a valve 15 . 16 Mistake. These valves 15 . 16 in turn, each with a control device 12 connected.

All valves, including the valve 11 , are preferably designed as so-called solenoid valves, wherein the control device 12 for actuating the valves 11 . 15 and 16 preferably and as in the 1 and 2 is shown arranged on the boiler.

Finally, at least one of the connection lines is for conveying the fuel 4 . 5 . 7 . 10 with a pump 17 provided, beyond that on at least one connecting line 4 . 5 a filter element (not shown separately because it is readily conceivable) is provided in order to be able to separate impurities from the oils (in particular the biogenic oil).

1

Storage

2

Storage

3

burner

4

connecting line

5

connecting line

6

mixing memory

7

connecting line

8th

first chamber

9

second chamber

10

connecting line

11

Valve

12

control device

13

supply line

14

Return line

15

Valve

16

Valve

17

pump

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19503463 A1 [0002]
• - DE 102004050602 A1 [0013]

Claims (14)

Boiler plant comprising a boiler with a burner ( 3 ) for liquid fuels and at least two storage tanks ( 1 . 2 ) for storing the liquid fuel, the burner ( 1 ) and the memory ( 2 ) are hydraulically connected to each other and wherein at least one of the memory ( 1 ) is used for storing a mineral oil, characterized in that at least one of the memory ( 2 ) is used for storage of a biogenic fuel, wherein the memory ( 1 . 2 ) via controlled connectable connection lines ( 4 . 5 ) with a mixed memory ( 6 ) and wherein the mixed memory ( 6 ) via at least one connecting line ( 7 ) with the burner ( 3 ) connected is. Boiler plant according to claim 1, characterized in that the mixing reservoir ( 6 ) a first and a second chamber ( 8th . 9 ), wherein the connecting lines ( 4 . 5 ) to the memories ( 1 . 2 ) in the first chamber ( 8th ) and wherein the at least one connecting line ( 7 ) to the burner ( 3 ) with the second chamber ( 9 ) connected is. Boiler plant according to claim 2, characterized in that between the first and second chambers ( 8th . 9 ) of the mixed memory ( 6 ) a controllable lockable connection line ( 10 ) is arranged. Boiler plant according to claim 3, characterized in that the connecting line ( 10 ) a valve ( 11 ) provided with a control device ( 12 ) connected is. Boiler plant according to one of claims 2 to 4, characterized in that the first chamber ( 8th ) larger than the second chamber ( 9 ) is trained. Boiler plant according to claim 5, characterized in that the first chamber ( 8th ) has a volume in the range of 2 to 6 l and that preferably the second chamber ( 9 ) has a volume of 1 to 3 l. Boiler plant according to one of claims 1 to 6, characterized in that the connecting line ( 7 ) to the burner ( 3 ) from a supply line and a return line ( 13 . 14 ) is formed. Boiler plant according to one of claims 1 to 7, characterized in that the connecting lines ( 4 . 5 ) between the memories ( 1 . 2 ) and the mixed memory ( 6 ) each with a valve ( 15 . 16 ) are provided. Boiler plant according to claim 8, characterized in that the valves ( 15 . 16 ) each with a control device ( 12 ) are connected. Boiler plant according to one of claims 1 to 9, characterized in that at least one of the connecting lines ( 4 . 5 . 7 . 10 ) with a pump ( 17 ) is provided to promote the fuel. Boiler plant according to claim 4 or 9, characterized in that the control device ( 12 ) is arranged on the boiler. Boiler plant according to one of claims 1 to 11, characterized in that at least one connecting line ( 4 . 5 ) is provided with a filter element. Method for operating a boiler installation, in which a burner ( 3 ) of a boiler of liquid fuel from at least two stores ( 1 . 2 ), at least one of the memories ( 1 ) is used for storing a mineral oil, characterized in that at least one of the memory ( 2 ) is used for storing a biogenic fuel, wherein in the storage ( 1 . 2 ) stored, liquid fuel first a mixed memory ( 6 ) is supplied and there is a fuel mixture, the fuel mixture then from the mixing memory ( 6 ) coming to the burner ( 3 ) is supplied. A method according to claim 13, characterized in that the from the memories ( 1 . 2 ) are mixed with each other in a first step and supplied to the burner in a second step, wherein the first step with respect to the adjustment of the fuel mixture ratio is unaffected by the second step.