CN219933968U

CN219933968U - Easily cooled burner

Info

Publication number: CN219933968U
Application number: CN202321646106.XU
Authority: CN
Inventors: 顾玉泉; 潘跃进; 阎韬; 彼得·万凯姆潘; 瑞米·奇亚瓦; 张爱丽; 曹亮
Original assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Current assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2023-10-31
Anticipated expiration: 2033-06-27

Abstract

The utility model discloses an easy-to-cool combustor, which comprises a combustor body, wherein the combustor body comprises: a primary oxidant fuel delivery member, a secondary oxidant delivery member, and a tertiary oxidant delivery member; the primary oxidant fuel delivery member includes at least one fuel supply passage through which fuel flows; and at least one primary oxidant supply channel through which a primary oxidant flows, the primary oxidant supply channel configured to surround an outer wall of the fuel supply channel; wherein a cooling medium passage is provided on the outer peripheral side of the fuel supply passage. By providing a cooling medium channel, the burner can be cooled, the temperature of the burner, in particular the fuel supply conduit, is reduced, and the furnace cooling of the burner is achieved in a short time, so that the burner is not damaged.

Description

Easily cooled burner

Technical Field

The utility model relates to an easy-to-cool burner. In particular, the present utility model relates to a burner provided with a cooling device. More particularly, the present utility model relates to a burner which is simple in structure and can complete cooling in a short time.

Background

In metallurgical or glass industry furnaces, oxy-fuel combustion has lower investment costs, higher combustion efficiency, lower NOx emissions and higher product quality than conventional air combustion.

In the prior art, common staged oxy-fuel burners have at least one fuel channel and at least one oxidant channel. By means of the oxidant classification, a portion of the oxidant can be split and combustion can thus be retarded. The nozzle end of the burner produces a substantially flat fuel-rich flame and the staged nozzle introduces a portion of the oxidant from above or below the fuel-rich flame, thus producing a fuel-lean flame.

The arrangement of the cooling medium is particularly important for multi-layer burners. In particular, it is necessary to accurately position the fuel supply member, the oxidant supply member, and the coolant member of the burner in the field.

Disclosure of Invention

The present utility model is intended to solve the above-mentioned technical problems of the prior art and to provide an easily cooled burner.

In order to achieve the above object, in a first aspect of the present utility model, there is provided a coolable burner, wherein the burner includes a burner body which extends in an axial direction and forms a flame for heating a heated material at a front end face thereof, the burner body comprising: a primary oxidant fuel delivery member, a secondary oxidant delivery member, and a tertiary oxidant delivery member;

the secondary oxidant delivery member and the tertiary oxidant delivery member are disposed on the same side of the primary oxidant fuel delivery member, and the secondary oxidant delivery member is located between the tertiary oxidant delivery member and the primary oxidant fuel delivery member;

the primary oxidant fuel delivery member includes at least one fuel supply passage through which fuel flows; and at least one primary oxidant supply channel through which a primary oxidant flows, the primary oxidant supply channel configured to surround an outer wall of the fuel supply channel;

wherein a cooling medium passage is provided on the outer peripheral side of the fuel supply passage.

Further, a portion of the primary oxidant supply passage serves as a cooling medium passage.

Further, the secondary oxidant delivery member comprises at least one secondary oxidant supply channel through which a secondary oxidant flows, one end of the at least one secondary oxidant supply channel being provided with a secondary oxidant nozzle.

Further, the tertiary oxidant delivery member includes at least one tertiary oxidant supply channel through which a tertiary oxidant flows, one end of the at least one tertiary oxidant supply channel being provided with a tertiary oxidant nozzle.

Further, the cooling medium is air or nitrogen.

Further, when combustion is stopped in the burner, the cooling medium is circulated and injected into the burner body.

The easy-to-cool burner provided by the utility model has the following advantages: by providing a cooling medium channel for cooling the burner, the temperature of the burner, in particular the fuel supply conduit, can be reduced, and the furnace cooling of the burner can be achieved in a short time, so as not to damage the burner. And when the ash is required to be removed or condensate outside the fuel supply conduit is removed, the cooling medium channel can be simply and conveniently filled with cooling medium for purging.

Drawings

The advantages and spirit of the present utility model will be further understood from the following detailed description of the utility model and the accompanying drawings.

Fig. 1 shows a schematic view of a cross section of an exemplary burner according to the present utility model.

Fig. 2 shows a schematic view of the cooling medium channel.

Fig. 3 shows a schematic diagram of the cooling medium flow direction and the oxidant flow direction.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the description of the present utility model, it must be interpreted that the orientation and positional relationship indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" are based on the orientation or positional relationship shown in the drawings, and are merely intended to facilitate the simplified description of the present utility model, without indicating or implying that the apparatus or elements being referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it must be interpreted that the terms "mounted," "connected together," and "connected" are to be construed broadly, e.g., may mean connected in a fixed manner, but may also mean removably connected or integrally connected, unless explicitly stated and defined otherwise; may represent a mechanical connection; may refer to being directly connected together, but may also refer to being indirectly connected together via an intervening medium; and may represent internal communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to specific circumstances.

Each aspect or embodiment defined herein may be combined with any other aspect or embodiment unless clearly indicated otherwise. In particular, any preferred or advantageous feature indicated may be combined with any other preferred or advantageous feature indicated.

As used herein, the expression "surrounding" or "encircling" substantially means forming a ring shape, generally meaning that the inner ring is enclosed within the outer ring such that there is a gap between the inner and outer layers. This gap may be an annular gap or a non-annular gap. As used herein, this may mean that the primary oxidant supply channel surrounds a portion (e.g., more than half) of the circumference of the fuel supply channel, or that the primary oxidant supply channel surrounds the entire circumference of the fuel supply channel. The latter case may be interpreted to mean that the primary oxidant supply channels are arranged so as to completely encircle the circumference of the fuel supply channels in the circumferential direction. The design of the fuel nozzle and the annular nozzle may be understood in a similar manner.

As used herein, the expression "staged" means that the fuel and oxidant are mixed at different times and locations such that low nitrogen oxide emissions and control of the gas atmosphere near the surface of the molten material can be achieved. By staged it is meant that the oxidant can be supplied at different rates or flow rates via another nozzle spaced from the fuel nozzle. For example, when the classification of the secondary oxidant and the tertiary oxidant is 95%, this means that the remaining 5% of the oxidant is supplied to the primary oxidant fuel delivery means together with the fuel.

As used herein, the expression "fuel" means a gaseous, liquid or solid fuel that can be used interchangeably or in combination. The gaseous fuel may be natural gas (mainly methane), propane, hydrogen or any other hydrocarbon compound and/or sulfur-containing compound. The solid or liquid fuel may be predominantly any compound in the form of carbon and/or hydrocarbon and/or sulfur. The solid fuel may be selected from petroleum coke, coal fines, biomass particles, or other fossil fuels, which typically require a carrier gas (e.g., air or carbon dioxide) to form the transport wind transport. The liquid fuel may be selected from liquid hydrocarbons or coal tar. The manner of introduction of the gaseous, liquid or solid fuel can be determined by one skilled in the art as desired. The present utility model is not intended to impose any limitations in this respect. Some of the data presented herein uses natural gas as a fuel, but the results are considered applicable to other fuels, such as hydrogen and other gaseous fuels.

As used herein, the expression "oxidizing agent" may be constituted by an oxidizing agent such as air or oxygen-enriched air. The oxidizing agent is preferably composed of an oxidizing agent having a molar oxygen concentration of at least 50%, preferably at least 80%, more preferably at least 90%, and most preferably at least 95%. These oxidants include oxygen enriched air comprising at least 50% oxygen by volume, such as 99.5% pure oxygen produced by cryogenic air separation plants, or non-pure oxygen produced by vacuum pressure swing adsorption processes (88% by volume or greater), or oxygen produced by any other source.

As used herein, the expression "axial direction of the burner body" refers to a direction that is substantially parallel to the axis of rotation, axis of symmetry, or centerline of the burner body, substantially referring to the direction of delivery of fuel in the primary oxidant fuel delivery means.

Here, the use of oxy-fuel may purge nitrogen from the melting operation and reduce NOx and particulate emissions to below standard. The use of oxy-fuel burners may achieve different flame momentums, melt coverage and flame radiation characteristics. In the furnace, the main sources of nitrogen are air leakage, low purity oxygen supplied from a vacuum pressure swing adsorption apparatus or pressure swing adsorption apparatus, nitrogen in fuel (e.g., natural gas), or nitrogen contained in molten raw materials charged in a heating furnace.

As used herein, the fuel supply channel, the primary oxidant supply channel, the secondary oxidant supply channel, and the tertiary oxidant supply channel may be generally annular channels, and may have regions of inlet and outlet. Each of the generally annular channels is preferably annular when viewed in cross-section from a plane perpendicular to the axial flow direction, but this shape may also be non-annular.

A burner for fuel combustion and a method of combustion thereof are disclosed in chinese patent application No. CN202080084376.9, the disclosure of which and the entire contents thereof are incorporated herein.

Fig. 1 shows a schematic view of a cross section of an exemplary burner according to the present utility model. The exemplary burner has a total fuel inlet and a total oxidant inlet. The burner metal member 3 may be a metal body inserted into a burner block 2 of a substantially cuboid shape, which together form part of the burner body. The burner hardware 3 is provided with a total fuel inlet, a total oxidant inlet, an oxidant staging control mechanism and a separation channel. The oxidant staging control mechanism and separation channels may allow fuel or oxidant to be delivered to the fuel supply channel 11, the primary oxidant supply channel 12, the secondary oxidant supply channel 21, and the tertiary oxidant supply channel 31 in proportion. A primary oxidant supply channel 12, in which a primary oxidant flows, surrounds the outer wall of the fuel supply channel 11 and is coaxial with the fuel supply channel 11. One end of the primary oxidant supply channel 12 is provided with an annular nozzle 121 surrounding the fuel nozzle 111. The outlet end of the annular nozzle 121 may terminate at the front end face of the burner body to form a flame that heats the object to be heated.

Fuel is delivered to the fuel supply passage 11 via the total fuel inlet; the fuel supply passage 11 terminates at a fuel nozzle 111. The fuel nozzle 111 may have a circular cross-section or may have a non-circular cross-section with an aspect ratio. All oxidant is delivered to the burner hardware 3 via the total oxidant inlet; the oxidant staging control mechanism in the combustor metal member 3 distributes the total oxidant to at least one of the primary oxidant supply channels 12, the secondary oxidant supply channels 21 and the tertiary oxidant supply channels 31 in proportion. The primary oxidant supply channel 12 for the primary oxidant to flow through as shown in fig. 1 surrounds the outer wall of the fuel supply channel 11 and is coaxial with the fuel supply channel 11. An annular nozzle 121 surrounding the fuel nozzle 111 is provided at one end of the primary oxidant supply passage 12.

The secondary-oxidant supply passage 21 for the flow of the secondary oxidant is provided at its end with a secondary-oxidant nozzle 211.

The three-stage oxidizing agent supply passage 31, in which the three-stage oxidizing agent flows, is provided at its end with a three-stage oxidizing agent nozzle 311.

The fuel supply passage 11, the secondary oxidant supply passage 21, and the tertiary oxidant supply passage 31 are arranged in this order from bottom to top.

The fuel supply passage may be a fuel conduit formed of a suitable material (e.g., refractory metal or ceramic). The beginning of the fuel conduit is removably connected to the burner hardware 3, but may also be integrally formed therewith. The outlet end of the fuel conduit is connected to a fuel nozzle 111. The oxidant supply channels may be oxidant supply conduits formed of a particular material (e.g., refractory metal or ceramic), but may also be shaped conforming cavities or channels formed in the burner block. In the latter case, the burner metal members 3 are inserted into the starting areas of the corresponding cavities or channels of the burner block 2, so that the oxidizing agent flows in these cavities or channels.

The total oxidant can be separated into three streams: a primary oxidant stream, a secondary oxidant stream, and a tertiary oxidant stream. The primary oxidant stream surrounds the fuel nozzles 111 and has a volumetric flow rate that is only a small percentage of the total oxidant, preferably less than 20% or less than 10% or less than 5% or about 2% -5%. The remaining oxidant is used as the secondary oxidant stream and the tertiary oxidant stream. This will correspond to a preferred fractionation ratio of at least 10% or at least 20% or at least 40% or at least 50% or at least 60% or even at least 70%, respectively. This means that a sufficient amount of oxidant flows through the secondary oxidant supply channel or the tertiary oxidant supply channel, or is distributed between the two supply channels, for classification. This not only reduces NOx production, but also significantly improves the ability to control the atmosphere of the gas adjacent the molten surface of the heated material. In order to be able to control the atmosphere close to the molten surface so as to selectively perform oxidation or reduction according to the treatment conditions, it is desirable that the operation of the burner can be switched conveniently. To this end, the oxidant flow (i.e., stream) in the primary, secondary, and tertiary oxidant supply channels may be independently controlled by means of an oxidant staging control mechanism. The oxidant streams are all independent of each other, so that precise control of combustion can be achieved.

It should be noted that it is not ideal that the primary oxidant stream is zero; this will create a void or vacuum in the primary oxidant supply channel, thus drawing in hot corrosive furnace gases, which will destroy the burner very quickly and cause flame instability. Furthermore, if the primary oxidant stream is too small, flame stability will also decrease; moreover, the mixed state of the gaseous fuel and the oxidizer will be deteriorated, making it difficult to obtain a practical flame. In some cases, the secondary oxidant stream or the tertiary oxidant stream may be near zero; in this case, the burner is substantially close to or equivalent to a dual stage burner, and the corresponding combustion effects and characteristics can be predicted and adjusted according to the knowledge of those skilled in the art.

As shown in fig. 2 and 3, in the burner of the present utility model, a cooling medium passage 201 is provided on the outer peripheral side of the fuel supply passage. In one aspect, the primary fuel oxidizer delivery component may be cooled by cooling air formed from air or nitrogen; on the other hand, when the burner is cooled, the combustion by the burner is stopped, the cooling medium passage is opened, and the cooling air is supplied, so that the combustion in the burner can be stopped. Thereby, deformation and damage to the primary fuel-oxidant delivery member caused by heat generated at the time of combustion and heat radiation from within the burner can be suppressed.

After the supply of the primary oxidant is partially or entirely stopped, the cooling medium passage is opened, and the cooling medium is fed through the primary oxidant supply passage 12, around the fuel supply passage 11. Thus, in one embodiment, fuel is introduced through the fuel supply passage 11, and a cooling medium is conveyed within the primary oxidant supply passage 12.

When the temperature in the burner is lowered for the purpose of maintenance of ash removal from the burner, the fuel supply passage 11 supplies fuel into the burner, introduces a cooling medium, and injects the cooling medium into the burner body to cool the burner and lower the temperature of the burner, particularly the fuel supply pipe.

While the present utility model has been presented in detail by the foregoing preferred embodiments, it should be understood that the foregoing description should not be deemed to limit the utility model. Various modifications and alterations to this utility model will become apparent to those skilled in the art upon reading the foregoing. Accordingly, the scope of the utility model should be limited only by the attached claims.

Claims

1. An easily cooled burner, characterized in that the burner comprises a burner body which extends in an axial direction and forms a flame for heating a heated material at a front end face of the burner body, the burner body comprising: a primary oxidant fuel delivery member, a secondary oxidant delivery member, and a tertiary oxidant delivery member;

2. The burner of claim 1, wherein a portion of the primary oxidant supply passage serves as a cooling medium passage.

3. The burner of claim 1, wherein the secondary oxidant delivery member comprises at least one secondary oxidant supply channel through which a secondary oxidant flows, one end of the at least one secondary oxidant supply channel being provided with a secondary oxidant nozzle.

4. The burner of claim 1, wherein the tertiary oxidant delivery member includes at least one tertiary oxidant supply passage through which the tertiary oxidant flows, one end of the at least one tertiary oxidant supply passage being provided with a tertiary oxidant nozzle.

5. The burner of claim 1, wherein the cooling medium is air or nitrogen.

6. A burner as claimed in claim 1, wherein when combustion is stopped in the burner, the cooling medium is circulated and injected into the burner body.