Premix gas burner

a gas burner and pre-mix technology, applied in the direction of gaseous fuel burners, fuel supply regulation, combustion processes, etc., can solve the problems of not finding optimal reduction of deleterious effects of offset variations which may occur in gas valves during long working time, and achieve the effect of reducing the negative effects of offset variations

Inactive Publication Date: 2013-08-29
GAS POINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026]It is thus an aim of the present invention to provide a premix burner in which the negative effects are further decreased upon possible offset variations, especially at low delivered thermal power rates.

Problems solved by technology

Although the results obtained by the premix burner object of international application WO2009 / 0133451 were overall satisfactory, the reduction of deleterious effects consequent to offset variations which may occur in the gas valve during its long working time was not found optimal.

Method used

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Examples

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Embodiment Construction

[0035]In a burner 10 illustrated in FIG. 1 a venturi channel air / gas mixer 11 is placed downstream of a fan 12 with respect to an air flow (AF). The mixer 11 comprises a localized pressure loss device 11A, in this case constituted by a venturi channel tube.

[0036]The burner 10 has a substantially longitudinal symmetry plane (X).

[0037]A pipe 13, which carries a pressure signal P1 to a gas valve 14, is connected upstream of the venturi channel type air gas mixer 11. Furthermore, a gas flow (GF) enters into the gas valve 14 at network pressure Po.

[0038]The amount of gas released by the gas valve 14 towards the mixer 11 is correlated to the pressure difference existing between an output pressure P2 of the gas valve 14 (pressure P2 equal to the pre-sure value P1) and a pressure P3 existing in the narrowest point (the localized loss of pressure device 11A) of the venturi channel type air / gas mixer 11.

[0039]The regulation of the air / gas ratio is mainly entrusted to the size of the nozzles (...

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Abstract

An air / gas premix burner is disclosed. The air / gas premix burner includes a fan for sending an air / gas mixture towards a combustion head and a gas valve for regulating the introduction of combustible gas. The air / gas premix burner also includes an air / gas mixer, which comprises a localized pressure loss device, and a combustion head. The air / gas mixer includes two channels. One of the channels is provided with two hinged flaps that are designed to open and close for regulating the flow rate of the mixture.

Description

TECHNICAL FIELD[0001]The present invention relates to a total premix gas / air burner (also called “premix burner”).BACKGROUND ART[0002]Total air / gas premix burners are currently known to be widely employed to produce thermal energy in gas boilers.[0003]The use of these burners is becoming rapidly more common, replacing the traditional atmospheric burners because with respect to the latter they allow to:[0004][A] have lower polluting substance emissions (nitrogen and carbon oxides);[0005][B] have high thermal exchange efficiencies at all thermal power rates, and in particular at minimum thermal power; and[0006][C] have high modulation ranges between maximum and minimum thermal power of the burner.[0007]At present premix air / gas burners are mainly made using the following essential components:[0008]a fan for supplying the air / gas mixture to a combustion head;[0009]a “pneumatically” actuated gas valve provided with a flow regulator;[0010]an air / gas mixing system consisting of a venturi ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23D14/04F23D14/60F23D14/36
CPCF23D14/02F23D14/36F23D14/04F23D14/70F23D2900/00003F23D14/60F23D14/34F23D14/62
Inventor ZATTI, CLAUDIORASTELLI, RAFFAELLOLOVASCIO, NICOLA
Owner GAS POINT
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