Installation of boiler

FRENCH REPUBLIC

MINISTRY OF INDUSTRY

On PROBLEMS PATENT P.V. no. 922,253 No. 1.350.932 SERVICE international Classification:

iNTELLECTUAL INDUSTRIELLE of the

Society said: A. g. [...] ROLL residing in Switzerland.

Demanded 22 January 1963, to 16^{11 16m,} to Paris.

Issued by stopped 23 December 1963.

{Patent application deposited in Switzerland 29 January 1962, under the n " 1.060/62,

on behalf of Company said: l. A. G. Von Roll)

The is to adapt the construction of foci

boilers to the type of the fuel to be burned, is,

more precisely, to the nature, to the- [...]

beneficial and combustion behavior of the

fuel, and the combustion products

that form. Result constructs that

provide the severity of the combustion conditions

optimal for a determined fuel. When-

by using another fuel away from es-

[...] of a fuel on which is based

the construction, it is no longer possible to attain the same-

mes results economically and tech-

ee to nic in the combustion. However-

transfer, it is often the case in practice that two combustion-

[...] by their characteristic substantially different-

ticks, their calorific value and their includes-

member to the combustion are to be burned in a

single focus. In such cases, the focus is

typically taking into account best

possible of the two fuels and can only be ob-

holding course that poor results. The

mentioned problems are most or-

wind in the boiler plants in the-

which is to be burning, in addition to the fuels

rich supplied to the main hearth, other com-

lean Conservation, such as, for example, the gold-

household hard. II can naturally be

also the opposite case, in other words that is used

to fuel rich as additional firing

or maintenance hearth burning refuse

household, i.e. a lean [...].

In the first case, the burning of rubbish

constitutes a complication relatively household

the focal points to the importance of the

devices causes disturbance and contamination

of the flue gas, and heating surfaces

by fly ash which is driven.

In the second case, the amounts of fuel

rich that are fired as additional firing

is not evaluated completely due to the

maximum that can be reached with regard to the temperatures of the focus and overheating.

The invention creates a boiler plant with which it is possible to burn with high efficiency two fuels substantially different to avoid the disadvantages mentioned. The boiler plant according to the invention is characterized in that there are two separate foci respectively, the paths followed by the flue gas within the boiler are completely independent.

An embodiment of the boiler plant according to the invention is shown diagrammatically, by way of non-limiting example, to the single Figure of the attached drawing.

Two separate foci 3 and 4, one of which (the focus 3) is provided for lean fuel, particularly household waste, and indicated by the arrow 11, while the other (the focus 4) is provided for the rich fuel, indicated by arrow 12, are arranged below the boiler 1, the system provides a set 2. Each of the two foci is adapted to the fuel, i.e. not only in the ratio of the magnitude and mechanical devices required, but also in terms of optimum conditions for combustion, such as the excess air ratio, the temperature and the load of the focus.

According to the invention, the flue gas produced in these two foci are not directed as usual in common (mixed) along the heating surfaces of the boiler, but licking separately defined portions of the heating surface and these sections are adapted to each parameter (temperature, amount, composition) of the exhaust gas in question. Thus that the flue gases exiting the focus 3 of the lean fuel, which in each case have a lower temperature, are preferably guided along the heating surfaces following 2' where they

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