CN216521648U

CN216521648U - Full-premixing rod-shaped low-calorific-value combustor

Info

Publication number: CN216521648U
Application number: CN202122678061.1U
Authority: CN
Inventors: 欧冶金; 肖奥; 陈琪; 明平保
Original assignee: Hubei Dongsheng Tianlong Energy Saving Technology Co ltd
Current assignee: Hubei Dongsheng Tianlong Energy Saving Technology Co ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-05-13
Anticipated expiration: 2031-11-03

Abstract

The utility model relates to a full-premixing rod-shaped low-calorific-value combustor which comprises a premixing device, a combustion distribution rod and a heat source device, wherein the premixing device comprises a volute, an outer barrel and a central circular tube, the central circular tube is embedded in the outer barrel, one end of the outer barrel is connected with the volute, the other end of the outer barrel is connected with one end of the combustion distribution rod, the other end of the combustion distribution rod is of a closed structure, a plurality of through holes are formed in the side tube wall of the central circular tube, one end of the central circular tube is provided with a fuel gas inlet, the other end of the central circular tube is of a closed structure, the heat source device is installed on the outer side surface of the combustion distribution rod, a plurality of jet orifices are formed in the combustion distribution rod, and the jet orifices are located on the lower side of the heat source device. The full-premixing rod-shaped low-calorific-value combustor can fully mix combustion-supporting gas and fuel gas. Meanwhile, when the pressure and the heat value of the low-heat-value gas fluctuate, the mixed gas can be stabilized.

Description

Full-premixing rod-shaped low-calorific-value combustor

Technical Field

The utility model relates to the technical field of steel plant flue gas denitration, in particular to a full-premixing rod-shaped low-calorific-value combustor.

Background

In the existing flue gas denitration process of a steel mill, the flue gas needs to be heated, and low-calorific-value blast furnace gas is generally used as fuel. The hot blast stove with the external flue is mostly adopted to generate high-temperature flue gas which enters the flue to be mixed with the flue gas to be heated for heating, and the temperature of the flue gas supplied by the mode is far lower than the theoretical combustion temperature, so that the gas consumption is large, and the increment of the flue gas is large; the burner is arranged on the outer wall of the flue or in the flue, a complex flow guide device is required to be arranged in the flue for ensuring the stability of combustion, so that the resistance of the flue is increased, the unburned loss of fuel gas is large, the uniformity of the temperature of the heated flue gas is poor, and the heating temperature of the flue gas has to be increased for meeting the process requirements.

There is therefore a need for a fully premixed rod-type low calorific value burner which solves the above mentioned technical problems.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems in the prior art, the utility model provides a full-premixing rod-shaped low-calorific-value combustor.

The technical scheme for solving the technical problems is as follows: the full-premixing clavate low-calorific-value combustor comprises a premixing device, a combustion distribution rod and a heat source device, wherein the premixing device comprises a volute, an outer barrel and a central circular tube, the central circular tube is embedded in the outer barrel, one end of the outer barrel is connected with the volute, the other end of the outer barrel is connected with one end of the combustion distribution rod, the other end of the combustion distribution rod is of a closed structure, a plurality of through holes are formed in the side tube wall of the central circular tube, one end of the central circular tube is provided with a gas inlet, the other end of the central circular tube is of a closed structure, the heat source device is installed on the outer side face of the combustion distribution rod, a plurality of jet orifices are formed in the combustion distribution rod, and the jet orifices are located on the lower side of the heat source device.

Preferably, the heat source device comprises a plurality of sudden expansion type combustion channels, the cross sections of the sudden expansion type combustion channels are circular, a first high temperature resistant heat accumulation masonry is arranged on the outer side of each sudden expansion type combustion channel, the cross section of the bottom of each sudden expansion type combustion channel is smaller than the cross section area of the top of each sudden expansion type combustion channel, the injection ports are located at the bottom of each sudden expansion type combustion channel, and the injection ports correspond to the sudden expansion type combustion channels one to one.

Preferably, in the fully premixed rod-shaped low calorific value burner, the heat source device includes a second high temperature resistant heat accumulation masonry located above the injection port, a slope is provided on a side of the second high temperature resistant heat accumulation masonry adjacent to the injection port, and an injection direction extension line of the injection port intersects with the slope.

Preferably, the above-mentioned full premix rod type low heating value burner, wherein an angle between an extension of an injection direction of the injection port and the inclined surface is 5 ° to 30 °.

Preferably, the above-mentioned full premix rod type low heating value combustor, wherein a plurality of the injection ports are arranged equidistantly in the axial direction of the combustion distribution rod.

Preferably, the above-mentioned full premix rod type low heating value burner, wherein the central axis of the central circular tube and the outer cylinder are located on the same straight line.

The utility model has the beneficial effects that: the volute, the outer barrel and the central circular tube are arranged in the premixing device, combustion-supporting air enters the outer barrel from the volute in a tangential rotation mode, a rotational flow is formed on the inner wall of the outer barrel, and fuel gas enters the premixing cavity of the outer barrel through the through hole in the central circular tube and forms cross flow with the combustion-supporting air, so that the two gases can be fully mixed, and the full combustion is facilitated; the mixed gas moves to the jet orifice along the combustion distribution rod and is jetted out from the jet orifice for combustion, and the mixed gas can be stably combusted by the arranged heat source device when the pressure and the heat value of the low-heat-value gas fluctuate. The full-premixing rod-shaped low-calorific-value combustor solves many defects existing in the traditional heating mode in the steel mill flue gas denitration process.

Drawings

FIG. 1 is a schematic view of the internal structure of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a left side view of the present invention;

fig. 4 is a left side view of another embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. combustion-supporting air inlet, 2, gas inlet, 3, central circular tube, 4, burning distribution stick, 5, through-hole, 6, heat source device, 61, first high temperature resistant heat accumulation brickwork, 62, sudden expansion type burning channel, 63, second high temperature resistant heat accumulation brickwork, 7, spiral case, 8, jet orifice, 9, urceolus.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1, fig. 2 and fig. 3, the fully premixed rod-type low calorific value burner mainly comprises a premixing device, a combustion distribution rod 4 and a heat source device 6. The premixing device comprises a volute 7, an outer cylinder 9 and a central circular tube 3, wherein the central circular tube 3 is embedded in the outer cylinder 9, and the central axes of the central circular tube 3 and the outer cylinder 9 are positioned on the same straight line. One end of the outer cylinder 9 is connected with the volute 7, the outer cylinder 9 is communicated with the center of the volute 7, a combustion air inlet 1 is formed in the outer portion of the volute 7, the inlet direction of the combustion air inlet 1 is tangent to the outer cylinder 9, combustion air enters the outer cylinder 9 from the volute in a tangential rotation mode, and a rotational flow is formed on the inner wall of the outer cylinder 9. A plurality of through holes 5 are formed in the side pipe wall of the central circular pipe 3, the through holes 5 are located in the inner cavity of the volute 7, a gas inlet 2 is formed in one end of the central circular pipe 3, the gas inlet 2 is located outside the premixing device, and the other end of the central circular pipe 3 is of a closed structure. The gas enters the inner cavity of the outer cylinder 9 (a premixing cavity formed between the outer cylinder 9 and the central circular tube 3) through the through hole on the central circular tube 3, and forms cross flow with combustion air to be fully mixed.

The right end of the outer cylinder 9 is connected with the left end of the combustion distribution rod 4, and the right end of the combustion distribution rod 4 is of a closed structure. The combustion distribution rod 4 is provided with a plurality of injection ports 8. The cross section of the combustion distribution rod 4 is circular or polygonal, 1 row or a plurality of rows of injection ports 8 are arranged in the range of 120 degrees of arc included angle of the cross section, and the injection ports 8 in each row are arranged at equal intervals along the axial direction of the combustion distribution rod 4. The ejection opening 8 is a bar shape or a circular shape.

The heat source device 6 is installed on the outer side surface of the combustion distribution rod 4, and the injection port 8 is located below the heat source device 6. The heat source device has two embodiments:

in the first embodiment, as shown in fig. 3, the heat source device 6 includes a plurality of sudden expansion type combustion passages 62, and the sudden expansion type combustion passages 62 have a circular cross section. The outer side of each sudden expansion type combustion channel 62 is provided with a first high temperature resistant heat accumulation masonry 61, the bottom cross section of each sudden expansion type combustion channel 62 is smaller than the top cross section, the injection ports 8 are located at the bottom of each sudden expansion type combustion channel 62, and the injection ports 8 correspond to the sudden expansion type combustion channels 62 one to one. And partial high-temperature combustion products are ensured to flow back to the root of the flame, so that the full combustion is facilitated.

In the second embodiment, as shown in fig. 4, the heat source device 6 includes a second high temperature resistant heat accumulation block 63, the second high temperature resistant heat accumulation block 63 is located above the injection port 8, a slope is provided on a side of the second high temperature resistant heat accumulation block 63 close to the injection port 8, and an extension line of the injection direction of the injection port 8 intersects with the slope. The included angle between the extension line of the injection direction of the injection port 8 and the inclined plane is 5-30 degrees, preferably 15 degrees, so that the mixed gas can be in full contact with the second high-temperature-resistant heat-accumulating masonry 63 conveniently.

In the two embodiments, the mixed gas moves to the injection port 8 along the combustion distribution rod 4 and is injected from the injection port 8 for combustion, the heat generated by combustion can heat the first high-temperature resistant heat accumulation masonry 61 and the second high-temperature resistant heat accumulation masonry 63 to maintain the high-temperature glowing state, and when the pressure and the heat value of the low-heat-value gas fluctuate, the high temperature of the first high-temperature resistant heat accumulation masonry 61 and the second high-temperature resistant heat accumulation masonry 63 can ignite the mixed gas, so that the combustion stabilization effect is achieved, and the stable combustion of the mixed gas is ensured.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the utility model. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. The full-premixing rod-shaped low-calorific-value combustor is characterized in that: comprises a premixing device, a combustion distribution rod (4) and a heat source device (6), wherein the premixing device comprises a volute (7), an outer barrel (9) and a central round tube (3), the central round tube (3) is embedded in the outer barrel (9), one end of the outer barrel (9) is connected with the volute (7), the other end of the outer barrel (9) is connected with one end of the combustion distribution rod (4), the other end of the combustion distribution rod (4) is of a closed structure, a plurality of through holes (5) are formed in the side tube wall of the central round tube (3), one end of the central round tube (3) is provided with a gas inlet (2), the other end of the central round tube (3) is of a closed structure, the heat source device (6) is arranged on the outer side face of the combustion distribution rod (4), and a plurality of jet orifices (8) are formed in the combustion distribution rod (4), the jet opening (8) is located on the lower side of the heat source device (6).

2. The fully premixed rod-shaped low calorific value burner of claim 1, wherein: the heat source device (6) comprises a plurality of sudden-expansion type combustion channels (62), the cross sections of the sudden-expansion type combustion channels (62) are circular, a first high-temperature-resistant heat accumulation masonry body (61) is arranged on the outer side of each sudden-expansion type combustion channel (62), the cross sections of the bottoms of the sudden-expansion type combustion channels (62) are smaller than the cross section area of the top of the sudden-expansion type combustion channels, the jet ports (8) are located at the bottoms of the sudden-expansion type combustion channels (62), and the jet ports (8) are in one-to-one correspondence with the sudden-expansion type combustion channels (62).

3. The fully premixed rod-shaped low calorific value burner of claim 1, wherein: the heat source device (6) comprises a second high-temperature-resistant heat storage masonry (63), the second high-temperature-resistant heat storage masonry (63) is located on the upper side of the injection port (8), an inclined plane is arranged on one side, close to the injection port (8), of the second high-temperature-resistant heat storage masonry (63), and an injection direction extension line of the injection port (8) is intersected with the inclined plane.

4. The fully premixed rod-shaped low calorific value burner of claim 3, wherein: the included angle between the extension line of the injection direction of the injection port (8) and the inclined plane is 5-30 degrees.

5. The fully premixed rod-shaped low calorific value burner of claim 1, wherein: the plurality of injection ports (8) are arranged at equal intervals along the axial direction of the combustion distribution rod (4).

6. The fully premixed rod-shaped low calorific value burner of claim 1, wherein: the central circular tube (3) and the central axis of the outer cylinder (9) are positioned on the same straight line.