GB2197714A

GB2197714A - Gas burner

Info

Publication number: GB2197714A
Application number: GB08726177A
Authority: GB
Inventors: Manfred Schingnitz; Christian Reuther; Peter Gohler; Rainer Wernecke; Ernest Gudymov; Vladimir Semenov; Boris Rodionov; Vasilij Fedotov
Original assignee: GNII PI AZOTNOJ; Brennstoffinstitut Freiberg
Current assignee: GNII PI AZOTNOJ; Brennstoffinstitut Freiberg
Priority date: 1986-11-18
Filing date: 1987-11-09
Publication date: 1988-05-25
Also published as: JPS63135706A; CS551787A1; GB8726177D0; DE3726875A1; DE3726875C2

Description

9 i 1 4 1. j 7 7 I 1 1 1 - The invention relates to a gas burner,

especially for the autothermal conversion of gaseous hydrocarbons into gases with a CO and H2 content, and is employable in chemical industry and gas industry, for example in the vapour-oxygen conversion of natural gas.

Germ. Dem. Rep. Pat. Specification 146765 describes a multi-nozzle burner for the partial oxidation of fuels capable of flowing. The multi-nozzle burner consists of a cylindrical jacket, a water-cooled jacket and corresponding feed and discharge devices for all media. The fuel is fed in via a central pipe of which-the end comprises a tubular widened part and which rests on a pipe base. From the said pipe base tubular components, of which the ends are fitted with nozzles, lead into the annular nozzles for the emergence of the oxygen or oxygenous gas. The nozzles contain spindle-shaped guide devices. When the burner is in operation the ends of the nozzles are intensively heated up by the radiation from the combustion chamber, as they are only slightly cooled by the flow of natural gas and oxygen. This may - 2 cause the burning of the metallic material with oxygen.

From Ger. Dem. Rep. Pat. specification 214912 a gas burner is disclosed which consists of a watercooled housing with a feed and with a central pipe for provided with a affixed therein 1 U connecting member for the gas distributing grid as well as a the oxygen feed with a collector pipe base on the end, pipes being which pass through the distributing grid. A cylindrical length of piping for the steam feed is installed with a collector in the annular chamber between the walls of the housing and the central pipe and is fitted with a pipe base on the end, with pipes secured therein, these being likewise taken through the distributing grid. The collector of the central pipe lies within the collector of the length of piping mentioned. distributing grid of the housing is positioned inside the latter. It can be in the form of a disc with a system of apertures or else be constructed as a ring with semicircular cut outs on its inner edge.

The known gas burner is comparatively unreliable. Owing to the contact with the steam, which for reasons of economy must be at a high temperature (350-4000C), and also as a result of heat radiation from the burner Y 3 reaction zone the mouths of the pipes carrying oxygen become overheated to such an extent that serious scaling occurs, accompanied by a risk that the industrial oxygen will burn the metal.

- The purpose of the invention is to render the burner more reliable in operation.

The object of the invention is to substantially avoid the risk, under all operating conditions, that the mouth of the burner will be burnt away by reaction with industrial oxygen.

According to the invention there is provided a gas burner comprising a housing having a base and a cooling jacket surrounding the base, a central pipe having a first collector whose end is provided with a first pipe base and first pipes whose ends are housed in the first collector, a second pipe situated in the space between the housing and the said central pipe and which second pipe has a second collector whose end is provided with a second pipe base housing second pipes surrounding spatially the said first pipes, wherein the cooling jacket terminates in a coolable base spaced apart from the housing base to provide a gap, the said first pipes are fixed at their ends in the said coolable base of the cooling jacket and the said second pipes are fixed at their ends in the said housing base, oxygen gas outlet 4 pipes are provided which pass through both the said housing base and the said coolable base of the cooling jacket, and the spaces between the said first and second pipes communicate with the said gap.

Oxygen gas outlet pipes may each be positioned ill a ring around the outlet ends of the said first pipes. In one advantageous form of the invention the said housing base and the said coolable base are inwardly curved and the axis of the oxygen gas outlet pipes and of the said first pipes which are remote from the axis of the are inclined the burner.

By way of invention will burner at their outlet end portions to the axis of Conveniently the housing is cylindrical. example only, two embodiments of the be described with reference to the accompanying drawings Figure 1 wherein:

is a longitudinal section of one form of burner having a flat base and a basal cooling jacket, and Figure 2 is a longitudinal section of a second form of burner having an inwardly curved base and a basal cooling jacket.

The burner shown in Figure 1 consists of a housing 1 with a connecting member 2 for the supply of oxygen gas with a base 5 surrounded by an outer cooling jacket 3 with a water outlet connecting member 4. The outer cooling jacket 3 terminates in a cooled base apart from the base 5. The housing contains pipe 6 with a connecting member 7 for natural with a collector 8 of which the bottom end is 16 spaced a central gas and fitted with a pipe base 9 housing ends of pipes 10, and length of piping 11 which surrounds the central pipe 6 and which has a connecting member 12 for water, and with a further collector 13 of which the bottom end is fitted with a further pipe base 14 housing pipe sections 15.

Outlet pipes 17 for oxygen gas, through which the latter is fed to a burner reaction zone, pass through the base 5 and into the cooled base 16. The pipes 10 are directly secured by their ends in the cooled base 16, while the pipe sections 15 are directly secured by their ends on the base 5 and surround the pipes 10. The annular gaps between the pipes 10 and the pipe sections 15 qhich surround them communicate with the gap between the base 5 and the cooled base 16. In the burner shown in Figure 2 the base 5 and the cooled base 16 are inwardly curved. The axis of'the outlet pipes 17 for oxygen and of the pipes 10 and surrounding pipe sections 15 which are remote from the axis of the burner are inclined in their outlet part in relation to the axis of the burner.

The burner shown in Figure 1 is normally operated as follows:

Natural gas is fed into the central pipe 6 via the natural gas feed connecting member 7 and passes into the collector 8 and as far as the pipe base 9. The natural gas also distributes itself among the pipes 10 and emerges into the burner reaction zone.

Via the connecting member 12 cooling water is introduced into the annular chamber between the central pipe 6 and the length of piping 11. It washes round the collector 8 and enters the collector 13, passing to the pipe base 14.

The cooling water enters the annular chamber between the pipes 10 and the pipe sections 15. It then passes through the end gap between the base 5 and the cooled base 16, at the same time washing round the oxygen outlet pipes 17 and also the ends of the pipes 10.

The cooling water then enters the annular chamber between the housing 1 and its outer cooling jacket 3 and is discharged via the water outlet connecting member 4.

The particular features of the operation of the gas burner shown in Figure 2 are as follows:

The oxygen gas conveyed through the outlet pipes and the natural gas fed in via the pipes 10 flow as separate jets inclined in relation to the axis of the burner.

The proposed gas burners described and illustrated offer the following advantages: (1) The constructional solution adopted in the invention for the cooling process renders the burne-rs extremely reliable in operation, as not only the pipes 10 through which the natural gas if fed to the system but also the oxygen gas outlet pipes 17 are reliably cooled by the water and overheating of these parts if practically avoided, no matter how the gas burner is operated. (2) The curved construction of the base 5 and of the cooled base 16 of the second embodiment and the fact that the outlet parts of the axis of the oxygen gas outlet pipes 17 and of the pipes 10 are inclined with respect to the axis of the burner make a further contribution to the reliability of the apparatus, as the heat to which the metal of the cooled jacket is subjected as a result of the flow of heat from the flame of the burner is counteracted more effectively by an inwardly curved than by a planar surface. In addition, the burner is rendered still more economical, as the jets of oxygen and of natural gas are more intensively mixed as a result of the way in which they are orientated according to the invention, a more complete reaction of the oxygen with the natural gas thus being ensured.

Claims

1. A gas burner comprising a housing having a base and a cooling jacket surrounding the base, a central pipe having a first collector whose end is provided with a first pipe base and first pipes whose ends are housed in the first collector, a second pipe situated in the space between the housing and the said central pipe and which second pipe has a second collector whose end is provided with a second pipe base housing second pipes surrounding spatially the said first pipes, wherein the cooling jacket terminates in a coolable base spaced apart from the housing base to provide a gap, the said first pipes are fixed at their ends in the said coolable base of the cooling jacket and the said second pipes are fixed at their-ends in the said housing base, oxygen gas outlet pipes are provided which pass through both the said housing base and the said coolable base of the cooling jacket, and the spaces between the said first and second pipes communicate with the said gap.

2. Gas burner in accordance with Claim 1, wherein the oxygen gas outlet pipes are each positioned in a ring around the outlet ends of the said first pipes.

3. Gas burner in accordance with Claim 1 or Claim 2, wherein the said housing base and the said coolable base are inwardly curved and the axis of the oxygen gas outlet pipes and of the said first pipes which are remote from the axis of the burner are inclined at their outlet end portions to the axis of the burner.

4. Gas burner in accordance with any preceding claim, wherein the housing is cylindrical.

5. A gas burner substantially as herein described and illustrated by Figure 1 or Figure 2 of the accompanying drawings.