阅读说明：本技术 一种防堵塞弥散式蓄热燃烧系统 (Prevent blockking up dispersed heat accumulation combustion system ) 是由 邓长友 于 2020-05-28 设计创作，主要内容包括：本发明公开了一种防堵塞弥散式蓄热燃烧系统,包括炉墙和由炉墙围成的炉膛,该炉墙上设置有贯通到炉膛内的气流通道和火口通道,气流通道和/或火口通道靠近炉膛的一侧形成有截面增大以防止堵塞气流通道和/或火口通道的扩张口。本发明通过在气流通道和火口通道与炉膛的交接处设置一个扩张口,从而,一方面即使是更大的物料也不能堵塞气流通道和火口通道的出口,也可使燃料或者气流从更多的物料间隙中通过,提升燃烧的效率；另一方面,也避免了炉膛内的物料接近或者紧贴气流通道,造成灰尘和小块物料吸入其中、严重影响燃烧和余热回收的问题。(The invention discloses an anti-blocking diffuse type heat storage combustion system which comprises a furnace wall and a hearth surrounded by the furnace wall, wherein an airflow channel and a fire hole channel which penetrate into the hearth are arranged on the furnace wall, and an expansion opening with the section enlarged to prevent the airflow channel and/or the fire hole channel from being blocked is formed on one side of the airflow channel and/or the fire hole channel, which is close to the hearth. According to the invention, the expansion opening is arranged at the joint of the airflow channel and the fire hole channel and the hearth, so that on one hand, even larger materials cannot block the outlets of the airflow channel and the fire hole channel, fuel or airflow can pass through more material gaps, and the combustion efficiency is improved; on the other hand, the problems that dust and small materials are sucked into the hearth and the combustion and waste heat recovery are seriously influenced due to the fact that the materials in the hearth are close to or tightly attached to the airflow channel are also avoided.)

1. The anti-blocking diffuse type heat storage combustion system comprises a furnace wall (2) and a hearth (1) enclosed by the furnace wall (2), wherein an airflow channel (5) and a fire hole channel (6) which penetrate into the hearth (1) are arranged on the furnace wall (2), and the anti-blocking diffuse type heat storage combustion system is characterized in that one side, close to the hearth (1), of the airflow channel (5) and/or the fire hole channel (6) is provided with an expansion opening with an enlarged section so as to prevent the airflow channel (5) and/or the fire hole channel (6) from being blocked.

2. Anti-clogging diffusive regenerative combustion system according to claim 1, characterized in that the cross-sectional area of said expansion opening is increasing in the direction of said furnace (1).

3. The anti-clogging diffusive regenerative combustion system according to claim 1, wherein said air flow channel (5) is arranged on both sides of said fire door channel (6), said air flow channel (5) and said fire door channel (6) each being formed with said diverging opening.

4. The anti-clogging diffusive regenerative combustion system according to claim 1, characterized in that the expanded opening of the gas flow channel (5) is a trumpet-shaped opening with a cross-sectional area larger than that of the gas flow channel (5), and the expanded opening is disposed obliquely to the bottom of the furnace (1).

5. The anti-clogging diffusive regenerative combustion system according to claim 1, characterized in that the flare of the burner channel (6) is a trumpet-shaped opening with a cross-sectional area larger than that of the burner channel (6), and the flare is disposed obliquely to the bottom of the furnace (1).

6. An anti-clogging diffusive regenerative combustion system according to any of the claims 1-5, characterized in that the intersection line (11) of the upper boundary surface and the vertical surface of the said divergent opening forms an angle θ with the horizontal plane (12)₃,θ₃Satisfies the following conditions: theta is more than or equal to 15 degrees below zero₃≤30°。

7. An anti-clogging diffusive regenerative combustion system according to any of the claims 1-5, characterized in that the intersection line (13) of the lower boundary surface and the vertical surface of the said expansion opening forms an angle θ with the horizontal plane (12)₄，θ₄Satisfies the following conditions: theta is more than or equal to 5 degrees₄≤50°。

8. An anti-clogging dispersively stored burning system according to any one of claims 1-5, characterized in that the intersection line (14) of the left boundary surface and the transverse surface of the said divergent opening and the vertical surface form an angle θ₁The included angle between the intersection line (16) of the right boundary surface and the transverse surface of the expansion opening and the vertical surface (15) is theta₂,θ₁Satisfies the following conditions: theta is more than or equal to minus 10 degrees₁≤60°,θ₂Satisfies the following conditions: theta is more than or equal to minus 10 degrees₂≤60°。

9. The anti-clogging diffusively regenerative combustion system according to any one of claims 1-5, wherein said expanded port has a depth of 200mm-700 mm.

Technical Field

The invention relates to the technical field of thermal engineering, in particular to a dispersion type heat accumulation combustion system with an anti-blocking function for heating combustion-supporting air by heat accumulation type waste heat recovery.

Background

The dispersive combustion is that fuel (usually, the fuel and a small amount of combustion air are mixed to keep stable flame) and combustion air (through an airflow channel) are separately injected into a furnace in a jet flow mode that the speed of the combustion air is higher than that of the fuel, the fuel and combustion products in the furnace are entrained by the airflow of the quick combustion air, the oxygen-containing volume concentration of a reaction zone is diluted, and a low-oxygen atmosphere with the concentration of 3-15% (volume) is obtained. The fuel is gradually combined with oxygen to be combusted in the high-temperature low-oxygen atmosphere, and is accompanied with a reforming process such as cracking, so that thermodynamic conditions completely different from those of premixed combustion and diffusion combustion processes are caused, heat energy is released under the delayed combustion with oxygen-poor gas, and a local high-temperature high-oxygen region which is generated in the conventional combustion process is not existed any more. This is a new combustion mode to be extensively studied.

Because the dispersive combustion brings the effects of energy saving and low NOx emission, a new technical scheme with low cost is provided for solving the atmospheric pollution and reducing the production cost of users, and the dispersive combustion can be popularized in the technical field of combustion at a high speed once being released. However, unlike the combustion process of the conventional premix technology, which is performed inside a burner, the diffusion combustion is performed by delivering fuel through a burner port channel and delivering combustion air through an air flow channel, and the mixing and combustion process of the fuel and oxygen is performed by using a hearth. This feature can lead to two serious cases:

the first case: if the materials in the hearth are stacked too much, for example, the top of an aluminum melting furnace with a top-lifting cover is opened, all the raw materials are put in from the upper part of the hearth at one time, and the process of falling and stacking the materials cannot be controlled, so that:

1. the materials occupy the hearth space required by the dispersive combustion, and air and fuel cannot be mixed in a preset mode to influence the full combustion of the fuel;

2. the airflow channel of the regenerative combustion system is circularly used for oxygen supply and flue gas exhaust. When the airflow channel is an air supply channel, the supply of combustion-supporting air is seriously influenced after the airflow channel is seriously blocked, and the combustion quality is influenced. When the airflow channel is a flue gas discharge channel, the flue gas cannot be discharged out of the hearth after being seriously blocked, the pressure of the hearth exceeds the standard, and the waste heat cannot be recovered;

3. the fire hole channel is responsible for fuel supply and flame stabilization, and when the fire hole channel is blocked, the fuel can not be mixed and even potential safety hazards are caused.

The second case: in the industries of aluminum melting and the like, a lot of ash with complex components is generated in the melting and refining processes of materials, if the materials in a hearth are close to or closely attached to a tuyere, when an airflow channel exhausts air, the ash with complex components and small materials are easily sucked into the airflow channel, and as shown in figure 1, the ash deposition and accumulation speed of the airflow channel is increased. The excessive dust deposition in the airflow channel can seriously affect the performance of a combustion system and a waste heat recovery system, and even cause the system to be incapable of working.

Practice proves that similar situations exist when the dispersion type combustion system is used in other aluminum melting furnaces, steel heating furnaces, ceramic furnaces and the like which use solid raw materials, popularization and application of the dispersion type combustion technology are seriously influenced, and even a plurality of enterprises which already adopt the dispersion type combustion technology have to dismantle the dispersion type combustion system to recover the original premixing type combustion system with high NOx emission and high energy consumption due to the existence of the problems.

Disclosure of Invention

The invention aims to provide an anti-blocking dispersion type regenerative combustion system, so that the problems are solved.

In order to achieve the purpose, the invention discloses an anti-blocking diffuse type heat storage combustion system which comprises a furnace wall and a hearth surrounded by the furnace wall, wherein an airflow channel and a fire hole channel which penetrate into the hearth are arranged on the furnace wall, and an expansion opening with the section enlarged to prevent the airflow channel and/or the fire hole channel from being blocked is formed on one side of the airflow channel and/or the fire hole channel, which is close to the hearth.

Furthermore, the sectional area of the expansion opening is increased towards the direction of the hearth.

Furthermore, the airflow channel is arranged on two sides of the fire hole channel, and the expansion openings are formed in the airflow channel and the fire hole channel.

Furthermore, the expanding opening of the airflow channel is a horn-shaped opening with the sectional area larger than that of the airflow channel, and the expanding opening is inclined towards the bottom of the hearth.

Furthermore, the expansion opening of the fire hole channel is a horn-shaped opening with the sectional area larger than that of the fire hole channel, and the expansion opening is inclined towards the bottom of the hearth.

Furthermore, the included angle between the intersection line of the upper boundary surface and the vertical surface of the expansion opening and the horizontal plane is theta₃,θ₃Satisfies the following conditions: theta is more than or equal to 15 degrees below zero₃≤30°。

Furthermore, the included angle between the intersection line of the lower side interface of the expansion opening and the vertical surface and the horizontal plane is theta₄，θ₄Satisfies the following conditions: theta is more than or equal to 5 degrees₄≤50°。

Furthermore, the included angle between the intersection line of the left interface and the transverse plane of the expansion opening and the vertical plane is theta₁The included angle between the intersection line of the right boundary surface and the transverse surface of the expansion opening and the vertical surface is theta₂,θ₁Satisfies the following conditions: theta is more than or equal to minus 10 degrees₁≤60°,θ₂Satisfies the following conditions: theta is more than or equal to minus 10 degrees₂≤60°。

Further, the depth of the expansion opening is 200mm-700 mm.

Compared with the prior art, the invention has the advantages that:

according to the invention, the expansion opening is arranged at the joint of the airflow channel and the fire hole channel and the hearth, so that on one hand, even larger materials cannot block the outlets of the airflow channel and the fire hole channel, fuel or airflow can pass through more material gaps, and the combustion efficiency is improved; on the other hand, the problems that dust and small materials are sucked into the hearth and the combustion and waste heat recovery are seriously influenced because the materials in the hearth are close to or tightly attached to the airflow channel (when the hearth is used as an exhaust channel) are also avoided.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic cross-sectional view in elevation and section of a prior art disclosed distributed regenerative combustion system;

FIG. 2 is a schematic top view of the disclosed anti-clogging dispersively storing combustion system in accordance with the preferred embodiment of the present invention;

FIG. 3 is a sectional view of the preferred embodiment of the present invention showing the burner of the anti-clogging pervasive combustion system in elevation;

FIG. 4 is a sectional view of the anti-clogging diffusive regenerative combustion system with a tuyere elevation as a cross section in accordance with the preferred embodiment of the present invention;

fig. 5 is a sectional view of the anti-clogging diffusive regenerative combustion system in a cross section taken along the tuyere according to the preferred embodiment of the present invention.

Illustration of the drawings:

1. a hearth; 2. a furnace wall; 3. a furnace door; 4. an airflow channel expansion port; 5. an air flow channel; 6. a fire hole channel; 7. a fire hole channel expansion port; 8. a fuel delivery pipe; 9. a flame; 10. a solid material; 11. the intersection line of the upper boundary surface and the vertical surface; 12. a horizontal plane; 13. the intersection line of the lower side interface and the vertical surface; 14. the intersection line of the left interface and the transverse plane; 15. a facade; 16. the intersection of the right boundary surface and the transverse surface.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 2-5, the invention discloses an anti-clogging diffuse type heat accumulation combustion system, which comprises a furnace wall 2 and a hearth 1 enclosed by the furnace wall 2, wherein a furnace door 3 is arranged on the furnace wall 2, an airflow channel 5 and a fire hole channel 6 which penetrate into the hearth 1 are arranged on the furnace wall 2, a fuel delivery pipe 8 is inserted in the fire hole channel 6, and a flame 9 is formed at a fuel outlet of the fuel delivery pipe. Wherein, the fire hole channel 6 is internally inserted with a fuel delivery pipe 8 for delivering fuel to the hearth 1, the airflow channels 5 are symmetrically arranged at the left and right sides of the fire hole channel 6, and are alternately circulated as an air supply channel and an air exhaust channel through a four-way valve and an air blower, thereby recovering the heat after combustion. In this embodiment, the side of the gas flow channel 5 and the fire hole channel 6 close to the furnace 1 forms an expansion opening with an increased inner sectional area, that is, the gas flow channel expansion opening 4 at the end of the gas flow channel 5 and the fire hole channel expansion opening 7 at the output end of the fire hole channel 6, specifically, the gas flow channel expansion opening 4 and the fire hole channel expansion opening 7 are obliquely arranged towards the bottom of the furnace 1. Therefore, on one hand, even larger materials cannot block the outlets of the gas flow channel 5 and the fire hole channel 6, and fuel or gas flow can pass through more gaps of the solid materials 10, so that the combustion efficiency is improved; on the other hand, the problems that the solid materials 10 in the hearth 1 are close to or tightly attached to the airflow channel 5 (when used as an exhaust channel), dust and small materials are sucked into the airflow channel, and combustion and waste heat recovery are seriously influenced are also avoided.

In the present embodiment, in order to better describe the structure of the gas flow channel expansion port 4 and the fire port channel expansion port 7, a vertical face 15 and a lateral face are defined for reference, the vertical face 15 is a plane defined by a center line of the gas flow channel 5 or the fire port channel 6 and a perpendicular line intersecting the center line, and fig. 4 is a sectional view taken by the plane as a section; the transverse plane is a plane defined by the central line of the air flow passage 5 or the fire hole passage 6 and a horizontal line vertically intersecting the central line, and fig. 5 is a sectional view taken by the plane as a section, wherein the intersection line 11 of the upper boundary surface and the vertical surface of the expansion hole and the horizontal plane 12 form an included angle theta₃The included angle between the intersection line 13 of the lower boundary surface and the vertical surface of the expansion opening and the horizontal plane 12 is theta₄The included angle between the intersection line 14 of the left boundary surface and the transverse surface of the expansion opening and the vertical surface 15 is theta₁The included angle between the intersection line 16 of the right boundary surface and the transverse surface of the expansion opening and the vertical surface 15 is theta₂In the present embodiment, θ₁＝15°，θ₂＝15°，θ₃＝7°，θ₄＝35°。

In the present embodiment, specifically, the airflow channel 5 is circular, and the cross-sectional diameter is Φ 280; the airflow passage expansion opening 4 is square, and has a bottom dimension of 500 × 450, which is larger in area than the airflow passage 5 by 3 times. The transition from round to square in cross section at the transition between the gas flow channel 5 and the gas flow channel expansion opening 4 is designed to be of an abrupt shape, as shown in fig. 4. The fire hole channel expansion opening 7 is a trumpet-shaped opening with the sectional area larger than that of the fire hole channel 6, and the section of the fire hole channel expansion opening 7 is also designed to be square; the depth of the gas flow channel expansion port 4 and the fire port channel expansion port 7 was 500 mm.

Of course, according to the principle that the flow passage transition abrupt change of the fluid generates a larger pressure loss than gradual change in fluid mechanics, if the system requires to reduce the pressure loss of the airflow, a section of the transition between the airflow passage 5 and the airflow passage expansion opening 4 from circular to square can be changed in a small trumpet-shaped gradual change manner, that is, the diameter of the circular transition of the airflow passage 5 at the transition gradually increases to about 3 times and is smoothly changed with the square section at the bottom of the airflow passage expansion opening 4.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.