阅读说明：本技术 一种变拱型双级拱“w”型火焰锅炉装置 (Variable arch type double-stage arch W-shaped flame boiler device ) 是由 石践 黄锡兵 席光辉 周科 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种变拱型双级拱“W”型火焰锅炉装置,它包括前后对称布置的前墙水冷壁和后墙水冷壁,所述前墙水冷壁和后墙水冷壁从上至下分别为上炉膛、变拱型双级拱、下炉膛和灰斗段,在上炉膛布置二级燃尽风喷口,在变拱型双级拱上从高到低分别布置一级燃尽风喷口、多用途二次燃料燃烧器喷口、主燃烧器喷口、拱上内二次风喷口和拱上外二次风喷口。利用分级燃烧原理通过改变燃烧器及配风的布置方式,进一步降低NO<Sub>x</Sub>含量,达到超净排放的要求,缓解分级送风燃烧时风量分配不匹配时,造成飞灰含碳量升高的缺点。取得了很好的效果。(The invention discloses a variable arch type two-stage arch W-shaped flame boiler device, which comprises a front wall water-cooled wall and a rear wall water-cooled wall which are symmetrically arranged front and back, wherein the front wall water-cooled wall and the rear wall water-cooled wall are respectively an upper hearth, a variable arch type two-stage arch, a lower hearth and an ash bucket section from top to bottom, a second-stage over-fire air nozzle is arranged on the upper hearth, and a first-stage over-fire air nozzle, a multi-purpose secondary fuel burner nozzle, a main burner nozzle, an over-arch inner secondary air nozzle and an over-arch outer secondary air nozzle are respectively arranged on the variable arch type two-stage arch from high to low. By using the staged combustion principle and changing the arrangement mode of the burners and air distribution, the NO is further reduced x The content of the fly ash meets the requirement of ultra-clean emission, and the defect of high carbon content of fly ash caused by mismatching of air volume distribution during staged air supply combustion is overcome. A good effect is obtained.)

1. The utility model provides a become two-stage arch "W" type flame boiler plant of arch type, it includes front wall water-cooling wall and back wall water-cooling wall that front and back symmetrical arrangement, its characterized in that: the front wall water-cooled wall and the rear wall water-cooled wall are respectively provided with an upper hearth (12), a variable arch double-stage arch (1), a lower hearth (11) and an ash bucket section (15) from top to bottom, secondary overfire air nozzles (10) are arranged on the upper hearth (12), primary overfire air nozzles (9), multi-purpose secondary fuel burner nozzles (5), main burner nozzles (2), arch inner secondary air nozzles (3) and arch outer secondary air nozzles (4) are respectively arranged on the variable arch double-stage arch (1) from high to low, the variable arch double-stage arch (1) comprises a primary arch (13) and a secondary arch (14), an included angle between the primary arch (13) and a horizontal plane is 10-20 degrees of upward inclination, an included angle between the secondary arch (14) and the horizontal plane is 40-50 degrees of upward inclination, the multi-purpose secondary burner nozzles (5) are arranged in the middle of the primary arch (13), and the primary overfire air nozzles (9) are arranged at the top of the primary arch (13), the primary burner nozzles (2) are arranged at the upper part of the secondary arch (14), and the secondary air nozzles (4) are arranged at the position of the secondary arch (14) close to the lower hearth (11).

2. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the lower hearth (11) is vertically arranged, the part, close to the ash bucket section (15), of the lower hearth (11) is provided with the secondary air nozzles (6) under the arch, the horizontal secondary air nozzles (7) under the arch are arranged between the secondary air nozzles (6) under the arch, and the ventilation air nozzles (8) under the arch are arranged above the secondary air nozzles (6) under the arch.

3. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the secondary overfire air of the secondary overfire air nozzle (10) is sprayed in a horizontal mode, and the included angle between the axis of the primary overfire air nozzle (9) and the horizontal plane is declined by 10-25 degrees.

4. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the main burner nozzle (2) is a circular nozzle, and the main burner is vertically arranged on the main burner nozzle (2).

5. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 2, wherein: the secondary air nozzles (6) under the arch are of rectangular structures and are provided with air doors with declination angle adjusting ranges of 0-55 degrees.

6. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the multi-purpose secondary fuel combustor nozzle (5) is provided with a secondary fuel combustor, and the injection angle of the secondary fuel is horizontally declined by 40-50 degrees.

Technical Field

The invention relates to a boiler, in particular to a variable arch type double-stage arch W-shaped flame boiler device, and belongs to the technical field of boiler equipment.

Background

W-shape of anthracite currently used for combustionWhen the flame boiler is in operation, NO in the flue gas_xThe content is high, even after being modified into a low-nitrogen burner, the NOx content at the outlet of a hearth is 800mg/m³. Meanwhile, the over-fire air is arranged at the outlet of the hearth, and the pulverized coal is combusted in a grading manner by graded air supply so as to reduce NO in the flue gas_xThe content of (a). In the conventional W-shaped flame boiler, the hearth space is rapidly narrowed at the upper part of the outlet of the burner, and the space required by secondary combustion is lacked, but the conventional modification scheme is used for reducing NO_XEmissions also tend to cause a reduction in boiler combustion economy.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the variable arch double-stage arch W-shaped flame boiler device achieves the purpose of reducing NOx discharge by utilizing the pulverized coal reburning technology and changing the arrangement mode of a combustor and secondary air, and solves the existing problems.

The technical scheme of the invention is as follows: a W-shaped flame boiler device with variable arch type double-stage arches comprises a front wall water-cooling wall and a rear wall water-cooling wall which are symmetrically arranged front and rear, wherein the front wall water-cooling wall and the rear wall water-cooling wall are respectively provided with an upper hearth, a variable arch type double-stage arch, a lower hearth and an ash bucket section from top to bottom, a second-stage over-fire air nozzle is arranged on the upper hearth, and a first-stage over-fire air nozzle, a multipurpose secondary fuel burner nozzle, a main burner nozzle, an arch type inner secondary air nozzle and an arch type outer secondary air nozzle are respectively arranged on the variable arch type double-stage arch from high to low.

The lower hearth is vertically arranged, secondary air nozzles under the arch are arranged at the position, close to the ash bucket, of the lower hearth, horizontal secondary air nozzles under the arch are arranged between the secondary air nozzles under the arch, and ventilation air nozzles under the arch are arranged above the secondary air nozzles under the arch.

The variable arch type double-stage arch comprises a first-stage arch and a second-stage arch, an included angle between the first-stage arch and a horizontal plane is 10-20 degrees of upward inclination, an included angle between the second-stage arch and the horizontal plane is 40-50 degrees of upward inclination, a multipurpose secondary fuel burner nozzle is arranged in the middle of the first-stage arch, a first-stage over-fire air nozzle is arranged at the top of the first-stage arch, a main burner nozzle is arranged on the upper portion of the second-stage arch, and an over-arch secondary air nozzle is arranged at the position, close to a lower hearth, of.

The second-stage overfire air of the second-stage overfire air nozzle is sprayed in a horizontal mode, and the included angle between the axis of the first-stage overfire air nozzle and the horizontal plane is declined by 10-25 degrees.

The main burner nozzle is a circular nozzle, and the main burner is vertically arranged on the main burner nozzle.

The secondary air nozzles under the arch are of rectangular structures and are provided with air doors with declination angles of 0-55 degrees.

the multi-purpose secondary fuel combustor nozzle is provided with a secondary fuel combustor, and the injection angle of the secondary fuel is horizontally declined by 40-50 degrees.

The invention has the beneficial effects that: compared with the prior art, the technical scheme of the invention increases the space of the secondary combustion area by changing the arrangement mode of the burners and the air distribution by utilizing the staged combustion principle. The relatively independent and wide secondary combustion area and the secondary fuel nozzle which is obliquely downwards injected strengthen the mixing of secondary fuel and smoke and increase the staying and reaction time of the secondary fuel and high-temperature smoke in the high-temperature oxygen-deficient secondary combustion area, thereby strengthening the reduction reaction of NOx, reducing the emission of NOx, and simultaneously, the strong mixing and the sufficient staying time are more beneficial to the burnout of the fuel. In addition, the relatively independent secondary combustion zone can reduce the influence and interference of the secondary fuel on the main combustion zone. This arrangement can further reduce NO_xThe content of the fly ash meets the requirement of ultra-clean emission, and the defect of high carbon content of fly ash caused by mismatching of air volume distribution during staged air supply combustion is overcome.

Drawings

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

Fig. 2 is a side view of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.