WO2013010303A1

WO2013010303A1 - Burner nozzle and coal gasifier

Info

Publication number: WO2013010303A1
Application number: PCT/CN2011/077186
Authority: WO
Inventors: 武桢
Original assignee: 马鞍山科达洁能股份有限公司
Priority date: 2011-07-15
Filing date: 2011-07-15
Publication date: 2013-01-24
Also published as: AU2011373506B2; RU2557814C1; AU2011373506A1

Abstract

A burner nozzle and a coal gasifier comprising the burner nozzle. The burner nozzle comprises a nozzle housing (10). A fuel pipe (20) and a combustion-supporting gas pipe (30) are disposed in the nozzle housing (10). The combustion-supporting gas pipe (30) surrounds the fuel pipe (20). An outlet end portion of the combustion-supporting gas pipe (30) protrudes from an outlet end portion of the fuel pipe (20). A dividing pipe (40) is disposed in the combustion-supporting gas pipe (30), and divides the combustion-supporting gas pipe (30) into a first combustion-supporting gas pipe (31) and a second boundary gas pipe (32). The second boundary gas pipe (32) is formed on an external side of the first combustion-supporting gas pipe (31). The outlet end portion of the fuel pipe (20) protrudes from an end portion of the dividing pipe (40). The combustion-supporting gas in the second boundary gas pipe (32) is capable of forming a boundary film on an inner wall of the outlet end portion, so as to protect the outlet end portion of the combustion-supporting gas pipe (30) and prevent the fuel sprayed by the fuel pipe (20) from wearing the outlet end portion of the combustion-supporting gas pipe (30), thereby extending the service life of the nozzle.

Description

Burning nozzle and coal gasifier

This invention relates to the art of combustion apparatus construction, and more particularly to a combustion nozzle. Further, the present invention relates to a coal gasifier in which the above-described combustion nozzle is mounted. Background technique

Combustion nozzles are general-purpose combustion components that are widely used in various combustion equipment such as engines, boilers, coal gasifiers, and the like.

A typical structure of a combustion nozzle is shown in FIG. 1. The combustion nozzle has a generally cylindrical nozzle housing 10 in which a fuel conduit 20 and a combustion gas conduit 30 are provided, and fuel and assistance for the fuel conduit 20 are provided. The combustion gas introduced into the gas pipe 30 is mixed at the end of the nozzle and ignited to form a flame. The combustion nozzles can be classified into air-assisted combustion type, oxygen-enriched combustion-supporting type and pure oxygen-supported combustion type according to the composition of the combustion gas. The oxygen content of the combustion gas in the oxygen-enriched combustion-supporting nozzle is more than 20%, and the pure oxygen combustion-supporting nozzle uses the combustion gas with an oxygen content of 99% or more.

For the combustion nozzle of the above structure, when dry coal powder is used as the fuel, nitrogen is generally used as the carrier gas, and the dry coal powder is carried by the carrier gas at a high flow rate, and is ejected from the front end of the combustion nozzle to facilitate the combustion of the combustion gas. . A disadvantage in the dry coal powder combustion nozzle is that the high-flow dry coal powder has a large frictional force, and the wear on the end of the combustion nozzle is severe, which affects the service life of the combustion nozzle.

In order to overcome this drawback, a solution proposed by the prior art is shown in Chinese Patent Application No. 200620045550. In this solution, the central conduit for the outflow of fuel is slightly lower than the annular conduit for the outflow of the combustion gas.

However, the above-mentioned techniques still have the following drawbacks: The high-speed outflow of the combustion gas has a suction effect on the discharged dry coal powder, and the dry coal powder causes severe wear on the end portion of the flow line of the combustion gas. Summary of the invention

The invention provides a combustion nozzle and a coal gasification furnace, which are used to solve the defects in the prior art, can avoid the wear of the end portion of the combustion gas pipeline, and improve the service life of the combustion nozzle and the coal gasification furnace.

The invention provides a combustion nozzle, comprising a nozzle housing, wherein an outlet end of the nozzle housing is provided with an outlet end of the fuel gas pipeline beyond an outlet end of the fuel pipeline, and the combustion gas pipeline has an isolation tube Separating the gas-assisted gas pipeline into a first gas-assisted gas pipeline and a second gas-containing gas pipeline, the first gas-assisted gas pipeline is formed on an outer side of the auxiliary gas pipeline, and an outlet end of the fuel pipeline is beyond Describe the end of the isolation tube.

Preferably, the outlet end of the combustion gas conduit has a closing portion; the end of the isolation tube extends beyond the starting end of the closing portion.

Preferably, the cross-sectional area at the outlet of the second accessory gas duct is smaller than the cross-sectional area of the second duct gas duct.

Preferably, the outlet of the isolation tube is provided with a baffle ring, and the baffle ring is connected to the outer wall of the isolation pipe and protrudes toward the second boundary gas pipe.

Preferably, the outer wall of the fuel pipe has a convex structure at a position close to the outlet end.

Preferably, the second entrainment gas conduit is in communication with the water vapor conduit, and the water vapor is introduced into the second entrainment gas conduit.

The present invention also provides a coal gasifier comprising the combustion nozzle provided by the present invention.

The combustion nozzle and the coal gasification furnace provided by the invention have a separation pipe disposed in the gas-assisted gas pipeline, and the isolation pipe separates the gas-assisted gas pipeline into a first gas-assisted gas pipeline and a second gas-filled gas pipeline, in the application process, the fuel The pipeline is fueled, the first gas-assisted gas pipeline and the second gas-filled gas pipeline are simultaneously supplied with the combustion gas, and the auxiliary gas in the second gas pipeline can form a boundary film on the inner wall of the outlet end of the second gas pipeline. The protective film is formed on the outlet end to prevent the fuel injected from the fuel pipe from causing wear on the combustion gas pipeline, and the service life of the nozzle can be improved. DRAWINGS

1 is a schematic structural view of a conventional typical combustion nozzle;

2 is a schematic structural view of a combustion nozzle according to a first embodiment of the present invention;

3 is a schematic structural view of a combustion nozzle according to a second embodiment of the present invention. Reference mark:

10 - nozzle housing; 20 - fuel pipe; 21 - protrusion;

31 - first gas pipeline; 32 - second gas pipeline; 33 - closing section;

40 - isolation tube; 41 - choke. Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 2, FIG. 2 is a schematic structural view of a combustion nozzle according to a first embodiment of the present invention. In the first embodiment of the present invention, the combustion nozzle includes a nozzle housing 10 in which a fuel conduit 20 and a combustion gas conduit 30 are disposed, and the combustion gas conduit 30 surrounds the outside of the fuel conduit 20, and the combustion gas conduit 30 The outlet end is beyond the outlet end of the fuel conduit 20.

The gas-assisted gas pipeline 30 has an isolating pipe 40. The isolating pipe 40 separates the gas-assisted gas pipe 30 into a ring-shaped first gas-assisted gas pipe 31 and a second gas-containing gas pipe 32, and the second gas-filled gas pipe 32 is formed in the first On the outside of the combustion gas conduit 31, the outlet end of the fuel conduit 20 extends beyond the end of the isolation tube 40.

In the combustion nozzle provided in this embodiment, since the isolation pipe is disposed in the combustion gas pipeline 30 40, the isolation pipe 40 separates the combustion gas pipeline 30 into a first combustion gas pipeline 31 and a second gas pipeline 32. In the application process, the fuel pipeline 20 is connected to the fuel, and the first gas pipeline 31 and the second The gas line 32 simultaneously enters the combustion gas, and the combustion gas in the second gas line 32 can form a boundary film on the inner wall of the outlet end portion, and form a boundary film protection on the outlet end of the second side gas line 32. It is possible to prevent the fuel injected from the fuel pipe 20 from causing wear to the second boundary gas pipe 32, and the service life of the combustion nozzle can be improved.

On the basis of the combustion nozzle provided by the first embodiment of the present invention, further improvement can be made, and the specific improvement scheme is as follows:

The outlet end of the second boundary gas pipe 32 has a closing portion 33; the outlet end portion of the isolation pipe 40 slightly exceeds the starting end portion of the closing portion 33.

In the combustion nozzle provided in this embodiment, since the outlet end portion of the combustion gas pipe 30 has the closing portion 33, when the combustion gas in the second boundary gas pipe 32 is discharged, the combustion gas is second to the starting end of the closing portion 33. The inside of the surface gas pipe 32 is changed in direction, so that the boundary film formed on the wall surface of the closing portion 33 is thicker, and the inner wall of the outlet end portion of the gas-assisting gas pipe 30 is more resistant.

In addition, on the basis of the combustion nozzle provided in the above embodiment, the cross-sectional area at the exit of the second boundary gas pipe 32 may be set smaller than the internal cross-sectional area of the second accessory gas pipe 32. Specifically, the isolation pipe 40 may be The cross section of the outlet formed by the end portion and the cuff portion 33 is designed to be smaller than the inner cross-sectional area of the second enclosing gas pipe 32. With this design, since the outlet of the second coanda gas pipe 32 is smaller than the inner size, the second The inner wall of the outlet end of the surface gas duct 32 forms a high velocity flow coanda membrane which is more effective in protecting the outlet end of the combustion gas conduit 30.

Referring to FIG. 3, FIG. 3 is a schematic structural view of a combustion nozzle according to a second embodiment of the present invention. The combustion nozzle provided in this embodiment is different from the combustion nozzle in the above embodiment in that the outlet of the isolation tube 40 is provided with a choke ring 41 which is connected to the outer wall of the isolation tube 40 and faces the The second surface gas pipe 32 extends.

In the combustion nozzle provided in this embodiment, since the outer ring at the outlet of the isolation tube 40 is provided with a choke ring 41, the choke ring 41 has a current limiting direction for the combustion gas in the second entrainment gas pipe 32. For example, a high-speed flowing coanda membrane can be formed on the inner wall of the outlet end of the gas-supporting gas pipe 30, and the protection effect on the outlet end of the gas-assisting gas pipe 30 is better.

In addition, as shown in FIG. 1 and FIG. 2, in the combustion nozzles provided in all of the above embodiments, the outer wall of the fuel pipe 20 has a protrusion 2 1 near the outlet end. Specifically, the protrusion 2 1 may be along the fuel pipe. 20 The circumferential protrusions 21 of the outer wall, the cross section of the protrusions 2 1 is a smooth transitional triangle, which ensures that the fuel and the combustion gas of the combustion gas pipeline 30 are sufficiently mixed, which is beneficial to the full combustion of the fuel.

It should be noted that, in the combustion nozzle provided in the above embodiment, the combustion gas is simultaneously introduced into the first gas-supporting gas pipeline 31 and the second gas-containing gas pipeline 32, and the combustion gas may be introduced into the first gas-assisted gas pipeline 31. , a second gas, such as water vapor, is introduced into the second attached gas pipe 32 to form a boundary film.

The embodiment of the present invention further provides a coal gasification furnace comprising the combustion nozzle provided by any embodiment of the present invention, which can prevent the fuel injected from the fuel pipeline from causing wear on the combustion gas pipeline, and can improve the service life of the nozzle.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A combustion nozzle comprising a nozzle housing, wherein an outlet end of the nozzle housing in which the fuel conduit is disposed extends beyond an outlet end of the fuel conduit, characterized in that the combustion gas conduit has isolation a pipe, the gas-assisted gas pipe is partitioned into a first gas-assisting gas pipe and a second gas-containing gas pipe, the first gas-assisted gas pipe is surrounded by the outer side of the second gas pipe, the outlet of the fuel pipe The end extends beyond the end of the isolation tube.

2. The combustion nozzle according to claim 1, wherein an outlet end of the combustion gas conduit has a closing portion; an end of the isolation tube extends beyond a starting end of the closing portion.

The combustion nozzle according to claim 1 or 2, wherein a cross-sectional area at the outlet of the second surface gas pipe is smaller than an inner cross-sectional area of the second gas pipe.

The combustion nozzle according to claim 1 or 2, wherein the end of the isolation tube is provided with a baffle ring, the baffle ring is connected to the outer wall of the isolation tube, and faces the second The attached gas pipe extends.

The combustion nozzle according to claim 4, wherein the outer wall of the fuel pipe has a convex structure at a position close to the outlet end.

The combustion nozzle according to claim 1 or 2, wherein the second surface gas pipe communicates with the water vapor pipe, and the water vapor is introduced into the second gas pipe.

A coal gasifier characterized by comprising the combustion nozzle according to any one of claims 1 to 6.