CN210511669U

CN210511669U - Oxygen-enriched efficient energy-saving combustor structure

Info

Publication number: CN210511669U
Application number: CN201921484755.8U
Authority: CN
Inventors: 王鸿川
Original assignee: Medium Furnace International Technology Co Ltd
Current assignee: Medium Furnace International Technology Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-05-12
Anticipated expiration: 2029-09-06

Abstract

The utility model discloses an energy-efficient combustor structure of oxygen boosting, the combustor is equipped with central gas passageway from inside to outside in proper order, annular combustion improver passageway, central gas passageway, the tip of annular combustion improver passageway communicates respectively has gas nozzle and combustion improver nozzle, gas nozzle and combustion improver nozzle are located the homonymy of combustor and keep away from the gas entry, gas nozzle and combustion improver nozzle all are the surface at gas nozzle of Laval injection pipe structure and combustion improver nozzle cover, Laval injection pipe presents one end wide, the structure that one end is narrow, the tip at central gas passageway and annular combustion improver passageway is fixed to the wide end of Laval injection pipe, the tip parallel and level of the narrow end of Laval injection pipe and combustor. The utility model discloses utilize the design that Laval drawn the ejector pipe, guaranteed the mixed effect of fuel gas and combustion improver in the low reaches combustion area, the reduction of effectual control pollutant emission.

Description

Oxygen-enriched efficient energy-saving combustor structure

Technical Field

The utility model relates to a combustor technical field especially relates to an energy-efficient combustor structure of oxygen boosting.

Background

NOx and CO are important atmospheric pollutants and are important factors for causing acid rain and haze. With the increasing environmental requirements, the limits on the amount of NOx and CO emissions are becoming more stringent. In the production process of the domestic industrial field, a large number of burners are used, wherein, besides the combustion improver is used as the combustion improver, a large number of technical processes adopt oxygen-enriched air as the combustion improver. The oxygen-enriched combustion technology is increasingly paid attention to the industry because of the advantages of high combustion temperature, less heat taken away by flue gas, easy ignition, good flame stability and the like. However, there is still much room for improvement in the pollutant emission of the oxycombustion, and various technical means for reducing the pollutant emission are still sought. Therefore, the design of the oxygen-enriched high-efficiency energy-saving combustor structure is particularly important for improving the use efficiency of the combustor and reducing the pollutant emission.

The traditional oxygen-enriched combustor generally adopts a high-speed jet structure, a strong swirling flow structure, a flue gas backflow structure and the like, so that the outlet position of the combustor in a downstream high-temperature area principle is ensured. The combustion area is divided into an oxidizing area and a reducing area through staged combustion and introduced flue gas backflow, and NOx generated in the high-temperature area is reduced through reduction reaction of the reducing area, so that the emission of fuel NOx is reduced, and the problem of high NOx emission is solved.

However, the existing oxygen-enriched combustor generally has the defects of short combustion flame, poor mixing effect of fuel and combustion improver, local high-temperature area, need of using a complex structure to ensure combustion efficiency and the like, and is easily tempered and deflagrated when being applied to the industrial field, so that the combustor is unstable in the use process, and the generation amount of NOx and CO is increased. Therefore, there is still a need for a more reasonable and effective oxygen-enriched energy-efficient burner structure to efficiently organize combustion and control pollutant discharge.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides an energy-efficient combustor structure of oxygen boosting has solved current oxygen boosting combustor ubiquitous combustion flame short, and fuel and combustion improver mixing effect is poor, have local high-temperature region, need use the problem of complex construction in order to guarantee combustion efficiency.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: an oxygen-enriched high-efficiency energy-saving burner structure comprises a central gas channel, an annular combustion improver channel and a coolant channel, wherein the burner is sequentially provided with the central gas channel, the annular combustion improver channel and the coolant channel from inside to outside, the central gas channel, the annular combustion improver channel and the coolant channel are of concentric circle structures, one side of the central gas channel, one side of the annular combustion improver channel and one side of the coolant channel are communicated with a gas inlet, a combustion improver inlet and a coolant outlet, the end parts of the central gas channel and the annular combustion improver channel are respectively communicated with a gas nozzle and a combustion improver nozzle, the gas nozzle and the combustion improver nozzle are positioned on the same side of the burner and far away from the gas inlet, the gas nozzle and the combustion improver nozzle are both of a Laval injection pipe structure, and the combustion improver nozzle covers the surface of the gas nozzle, the Laval injection pipe is of a structure with a wide end and a narrow end, the wide end of the Laval injection pipe is fixed at the end parts of the central gas channel and the annular combustion improver channel, and the narrow end of the Laval injection pipe is flush with the end part of the combustor.

Preferably, a plurality of air inlets are arranged on the narrow end surface of the gas nozzle at intervals along the circumferential direction of the gas nozzle, and the air inlets are communicated with the combustion improver nozzle.

Preferably, the diameter of the outlet of the gas nozzle is 15-60 mm.

Preferably, the combustion improver nozzle is divided into an expansion section, a throat section and a contraction section along the length direction of the combustion improver nozzle, the expansion section is fixedly connected to the annular combustion improver channel, the end part of the contraction section is flush with the burner, the diameter of an outlet of the expansion section is 45-75mm, the diameter of the throat section is 20-40mm, the expansion angle of the expansion section is 8-15 degrees, and the contraction angle of the contraction section is 30-60 degrees.

Preferably, a porous rectifying plate is arranged between the inner wall of the annular combustion improver channel and the outer wall of the central gas channel along the length direction of the annular combustion improver channel, and a plurality of porous radiating plates are arranged between the outer wall of the annular combustion improver channel and the inner wall of the coolant channel along the length direction of the annular combustion improver channel.

(III) advantageous effects

The utility model provides an energy-efficient combustor structure of oxygen boosting possesses following beneficial effect: the utility model provides a pair of oxygen boosting energy-efficient combustor structure, including central gas passageway, annular combustion improver passageway and coolant passageway. The fuel gas enters through a central fuel gas channel and finally reaches the fuel gas nozzle which is in a Laval injection pipe structure, the fuel gas introduces the combustion improver into a central area where the fuel gas is located in a high-speed jet mode, and the gas pressure is matched and adjusted through the expansion section to form mixed gas consisting of the fuel gas and the combustion improver, and the mixed gas enters a downstream combustion area. The structure of the Laval ejector pipe can be adjusted according to the actual operation characteristics of a downstream combustion space, so that the mixing time of fuel gas and combustion improver is influenced, and the generation of NOx and CO is reasonably controlled. The combustion improver can enter the combustor in a forced blowing mode, and reaches the combustion improver nozzle through the rectifying structure of the porous rectifying plate, the combustion improver nozzle is also in a Laval ejector pipe structure, and the combustion improver is introduced into the gas nozzle under the condition of pressure drop as small as possible, so that the combustion improver and the fuel gas are strongly mixed and enter a downstream combustion area together to form stable oxygen-enriched combustion flame. The coolant channel adopts a structural mode of enhancing heat transfer such as a porous heat dissipation plate, the heat exchange effect of the coolant and the metal part of the combustor is enhanced, the temperature of the metal structure of the combustor and the temperature of the combustion improver are effectively reduced, so that the temperature of oxygen-enriched flame can be adjusted, and the generation of NOx and CO is effectively controlled. The adjustability of the Laval injection pipe adopted by the gas nozzle and the combustion improver nozzle can provide a wider design space for the nozzle, meet the mixing requirements of different fuel gases and combustion improvers, improve the velocity distribution of mixed gas at the outlet of the nozzle, and optimize the temperature of oxygen-enriched combustion flame and the pollutant discharge performance.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of a partial structure of the present invention.

In the figure: 1. a central gas channel; 2. an annular combustion improver passage; 3. a coolant passage; 4. a gas inlet; 5. a combustion improver inlet; 6. a coolant inlet; 7. a coolant outlet; 8. a gas nozzle; 9. a combustion improver nozzle; 10. an air inlet; 11. an expansion section; 12. a throat section; 13. a contraction section; 14. a porous rectifying plate; 15. porous heat dissipation plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the following examples are proposed: an oxygen-enriched high-efficiency energy-saving combustor structure comprises a central gas channel 1, an annular combustion improver channel 2 and a coolant channel 3, wherein the combustor is sequentially provided with the central gas channel 1, the annular combustion improver channel 2, the coolant channel 3, the central gas channel 1, the annular combustion improver channel 2 and the coolant channel 3 in a concentric circle structure from inside to outside, one side of the central gas channel 1, the annular combustion improver channel 2 and the coolant channel 3 is communicated with a gas inlet 4, a combustion improver inlet 5, a coolant inlet 6 and a coolant outlet 7, the end parts of the central gas channel 1 and the annular combustion improver channel 2 are respectively communicated with a gas nozzle 8 and a combustion improver nozzle 9, the gas nozzle 8 and the combustion improver nozzle 9 are positioned on the same side of the combustor and far away from the gas inlet 4, the gas nozzle 8 and the combustion improver nozzle 9 are both in a Laval injection pipe structure, and the combustion improver nozzle 9 covers the gas nozzle 9 And 8, the Laval injection pipe has a structure that one end is wide and the other end is narrow, the wide ends of the Laval injection pipe are fixed at the end parts of the central gas channel 1 and the annular combustion improver channel 2, and the narrow end of the Laval injection pipe is flush with the end part of the combustor.

In this embodiment, the narrow end surface of the gas nozzle 8 is provided with a plurality of gas inlet holes 10 at intervals along the circumferential direction thereof, and the gas inlet holes 10 communicate with the oxidant nozzle 9. So that the fuel gas and the combustion improver can be fully mixed.

In the present embodiment, the outlet diameter of the gas nozzle 8 is 15-60 mm. The combustion improver nozzle 9 is divided into an expansion section 11, a throat section 12 and a contraction section 13 along the length direction, the expansion section 11 is fixedly connected to the annular combustion improver channel 2, the end part of the contraction section 13 is flush with the burner, the diameter of an outlet of the expansion section 11 is 45-75mm, the diameter of the throat section 12 is 20-40mm, the expansion angle of the expansion section 11 is 8-15 degrees, and the contraction angle of the contraction section 13 is 30-60 degrees. The structure of the Laval ejector pipe can be adjusted according to the actual operation characteristics of a downstream combustion space, so that the mixing time of fuel gas and combustion improver is influenced, and the generation of NOx and CO is reasonably controlled.

In this embodiment, a porous rectifying plate 14 is arranged between the inner wall of the annular combustion improver channel 2 and the outer wall of the central gas channel 1 along the length direction of the annular combustion improver channel, and a plurality of porous radiating plates 15 are arranged between the outer wall of the annular combustion improver channel 2 and the inner wall of the coolant channel 3 along the length direction of the annular combustion improver channel, so that the heat exchange effect between the coolant and the metal part of the combustor is enhanced, the temperature of the metal structure of the combustor and the temperature of the combustion improver are effectively reduced, the temperature of oxygen-enriched flame can be adjusted, and the generation of NOx and CO can be effectively controlled.

In fig. 1-2, the utility model provides an oxygen-enriched high-efficiency energy-saving burner structure, which comprises a central gas channel 1, an annular combustion improver channel 2 and a coolant channel 3. The fuel gas gets into through central gas passageway 1, reaches gas nozzle 8 at last, and gas nozzle 8 is the Laval ejector nozzle structure, and the gas is through the central zone that high-speed efflux mode introduced the fuel gas place with the combustion improver to carry out gas pressure's matching and adjustment through expansion section 11, form the mist of constituteing by fuel gas and combustion improver, get into the combustion area of low reaches. The structure of the Laval ejector pipe can be adjusted according to the actual operation characteristics of a downstream combustion space, so that the mixing time of fuel gas and combustion improver is influenced, and the generation of NOx and CO is reasonably controlled. The combustion improver can enter the combustor in a forced blowing mode, and reaches the combustion improver nozzle 9 through the rectifying structure of the porous rectifying plate 14, the combustion improver nozzle 9 is also in a Laval ejector pipe structure, and the combustion improver is introduced into the gas nozzle 8 under the condition of pressure drop as small as possible, so that the combustion improver and the fuel gas are strongly mixed and enter a downstream combustion area together to form stable oxygen-enriched combustion flame. The adjustability of the Laval injection pipe adopted by the gas nozzle 8 and the combustion improver nozzle 9 can provide a wider design space for the nozzle, meet the mixing requirements of different fuel gases and combustion improvers, improve the velocity distribution of mixed gas at the outlet of the nozzle, and optimize the temperature of oxygen-enriched combustion flame and the pollutant discharge performance.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an energy-efficient combustor structure of oxygen boosting which characterized in that: the central gas channel, the annular combustion improver channel and the coolant channel are sequentially arranged from inside to outside of the burner, the central gas channel, the annular combustion improver channel and the coolant channel are of concentric circle structures, one side of each of the central gas channel, the annular combustion improver channel and the coolant channel is communicated with a gas inlet, a combustion improver inlet, a coolant inlet and a coolant outlet, the end parts of the central gas channel and the annular combustion improver channel are respectively communicated with a gas nozzle and a combustion improver nozzle, the gas nozzle and the combustion improver nozzle are located on the same side of the burner and far away from the gas inlet, the gas nozzle and the combustion improver nozzle are of a Laval ejector pipe structure, the combustion improver nozzle covers the surface of the gas nozzle, and the Laval ejector pipe is wide in one end, The structure that one end is narrow, the wide end of Laval ejector pipe is fixed in the tip of central gas passageway and annular combustion improver passageway, the narrow end of Laval ejector pipe with the tip of combustor parallel and level.

2. An oxygen-enriched high-efficiency energy-saving burner structure as claimed in claim 1, wherein: the narrow end surface of the gas nozzle is provided with a plurality of air inlets at intervals along the circumferential direction, and the air inlets are communicated with the combustion improver nozzle.

3. An oxygen-enriched high-efficiency energy-saving burner structure as claimed in claim 1, wherein: the diameter of the outlet of the gas nozzle is 15-60 mm.

4. An oxygen-enriched high-efficiency energy-saving burner structure as claimed in claim 1, wherein: the combustion improver nozzle is divided into an expansion section, a throat section and a contraction section along the length direction of the combustion improver nozzle, the expansion section is fixedly connected to the annular combustion improver channel, the end part of the contraction section is flush with the combustor, the diameter of an outlet of the expansion section is 45-75mm, the diameter of the throat section is 20-40mm, the expansion angle of the expansion section is 8-15 degrees, and the contraction angle of the contraction section is 30-60 degrees.

5. An oxygen-enriched high-efficiency energy-saving burner structure as claimed in claim 1, wherein: and a plurality of porous heat dissipation plates are arranged between the outer wall of the annular combustion improver channel and the inner wall of the coolant channel along the length direction of the annular combustion improver channel.