Method and arrangement for reducing the effect of disturbances on the combustion of a fan burner system
AssigneeConel AG
InventorPaul Profos
Life of this patent
Estimating the term…
Abstract
A method for reducing the effect of disturbances, affecting the combustion of a fan burner system, including an arrangement for measuring the relative change of density of a gas as a function of its pressure and of its temperature and/or measuring a relative mass flow change of the gas as the function, at an at least nearly constant volume flow of the gas.
Claims10
A method for measuring a relative change of density of a gas as a function of its pressure and of its temperature comprising the steps of:
- providing a measuring gas within a closed receptacle of constant volume;
- coupling said gas through a wall of said receptacle isothermically to said gas to be measured;
- and
- measuring a pressure difference change P.sub.L -P.sub.V between the pressure of said gas to be measured P.sub.L and the pressure of said measuring gas within said receptacle P.sub.V as a measure of said relative change of density .DELTA..rho..sub.L /.rho..sub.Lo, the relative change of density .DELTA..rho..sub.L /.rho..sub.Lo being related to the pressure difference P.sub.L -P.sub.V in accordance with the following:
- ##EQU17## wherein:
- ##EQU18## the pressure difference P.sub.L -P.sub.V between the pressure P.sub.L of said gas being measured and the pressure P.sub.V of the gas within said receptacle with respect to a pressure P.sub.Lo at reference conditions, ##EQU19## change of density of said gas being measured with respect to its density at the reference conditions.
An arrangement for measuring a relative change of density of a gas as a function of its pressure and of its temperature, comprising:
- a closed rigid receptacle for a measuring gas, said receptacle for said measuring gas being isothermically coupled to said gas to be measured;
- and
- a pressure measuring arrangement, measuring a pressure difference between a pressure within said measuring gas receptacle and a pressure of said gas to be measured .DELTA.P.sub.L /P.sub.Lo, the relative change of density .DELTA..sub..rho.L /.rho..sub.Lo being related to the pressure difference P.sub.L -P.sub.V in accordance with the following:
- ##EQU20## wherein:
- ##EQU21## the pressure difference P.sub.L -P.sub.V between the pressure P.sub.L of said gas being measured and the pressure P.sub.V of the gas within said receptacle with respect to a pressure P.sub.Lo at the reference conditions, ##EQU22## change of density of said gas being measured with respect to its density at the reference conditions.
A method for reducing the effects of disturbances affecting the combustion of a fan burner system, wherein the fuel-to-combustion-air ratio of said system is adjusted in a feed-forward-control manner in dependency upon the temperature and the pressure of said combustion air, comprising the steps of:
- providing a measuring gas within a closed receptacle of constant volume, arranged within said combustion air;
- coupling said measuring gas through a wall of said receptacle isothermically to said combustion air;
- measuring a pressure difference change P.sub.L -P.sub.V between the pressure P.sub.L of said combustion air and the pressure P.sub.V of said measuring gas within said receptacle;
- and
- adjusting at least one of the mass flow of said combustion air and a fuel flow to said burner as a function of said pressure difference change.
A fan burner arrangement comprising:
- a burner;
- a combustion air feed having a fan and a fuel feed;
- at least one of a fuel flow adjusting means and a combustion air flow adjusting means within a respective one of said combustion air feed and said fuel feed;
- a closed rigid receptacle with a measuring gas within said combustion air feed, said receptacle for said measuring gas being isothermically coupled to combustion air within said combustion air feed;
- and
- a pressure measuring arrangement measuring a pressure difference between a pressure within said closed rigid receptacle and a pressure of said combustion air, the output of said pressure measuring means being connected to at least one of said adjusting means for said combustion air flow and said adjusting means for said fuel flow.
Dependencies are inferred from the claim text.