阅读说明：本技术 一种用于流化床锅炉的可调阻力的风帽结构 (Resistance-adjustable hood structure for fluidized bed boiler ) 是由 孙向文 赵翠晶 马玉喜 朱英伟 曲道志 姜孝国 王君峰 王刚 于 2021-08-17 设计创作，主要内容包括：一种用于流化床锅炉的可调阻力的风帽结构,它涉及流化床锅炉技术领域。本发明解决了流化床锅炉风帽结构存在风帽易脱落,炉内灰会通过内管反串至风室以及风帽阻力特性恒定且难以调节的问题。本发明的流线型风帽外罩扣装在多孔式风帽内管顶部且通过卡扣连接,多孔式风帽内管顶部被流线型风帽外罩罩住部分开设多个出气孔a,流线型风帽外罩开设多个出气孔b,流线型风帽外罩下缘通过定位板与流线型风帽外罩固定连接,多孔式风帽内管下部由下至上依次开设多排进气孔,可调式内管套管套设在多孔式风帽内管下部且通过卡扣连接,放灰堵板水平固定在多孔式风帽内管下端面上。本发明可实现风帽不脱落、灰不会通过风帽反串至风室以及布风板阻力可调。(A hood structure for fluidized bed boiler's adjustable resistance, it relates to fluidized bed boiler technical field. The invention solves the problems that the air cap of the fluidized bed boiler is easy to fall off, the ash in the boiler is reversely connected to the air chamber through the inner pipe, and the resistance characteristic of the air cap is constant and difficult to adjust. The streamline hood outer cover is buckled at the top of the porous hood inner tube and connected through a buckle, a plurality of air outlet holes a are formed in the part, covered by the streamline hood outer cover, of the top of the porous hood inner tube, a plurality of air outlet holes b are formed in the streamline hood outer cover, the lower edge of the streamline hood outer cover is fixedly connected with the streamline hood outer cover through a positioning plate, a plurality of rows of air inlet holes are sequentially formed in the lower portion of the porous hood inner tube from bottom to top, an adjustable inner tube sleeve is sleeved at the lower portion of the porous hood inner tube and connected through the buckle, and an ash discharge blocking plate is horizontally fixed on the lower end face of the porous hood inner tube. The invention can realize that the blast cap does not fall off, the ash does not reversely flow into the air chamber through the blast cap and the resistance of the air distribution plate is adjustable.)

1. A hood structure for adjustable resistance of fluidized bed boiler which characterized in that: the adjustable blast cap comprises a streamline blast cap outer cover (1), a positioning plate (2), a porous blast cap inner pipe (3), an adjustable inner pipe sleeve (4) and an ash discharge blocking plate (5), wherein the porous blast cap inner pipe (3) is vertically arranged, the streamline blast cap outer cover (1) is buckled at the top of the porous blast cap inner pipe (3) and is connected through a buckle, the top of the porous blast cap inner pipe (3) is covered by the streamline blast cap outer cover (1), part of the streamline blast cap inner pipe (1) is provided with a plurality of air outlets a at equal intervals along the circumference, the streamline blast cap outer cover (1) is provided with a plurality of air outlets b at equal intervals along the circumference, the positioning plate (2) is horizontally sleeved on the porous blast cap inner pipe (3), the lower edge of the streamline blast cap outer cover (1) is fixedly connected with the streamline blast cap outer cover (1) through the positioning plate (2), a plurality of rows of air inlets are sequentially arranged at the lower part of the porous blast cap inner pipe (3) from bottom to top, the adjustable inner pipe sleeve (4) is sleeved at the lower part of the porous blast cap inner pipe (3) and is connected through the buckle, the ash discharge blocking plate (5) is horizontally fixed on the lower end surface of the porous blast cap inner pipe (3).

2. The adjustable resistance hood structure for a fluidized bed boiler according to claim 1, wherein: the streamline hood outer cover (1) is in a round table structure, and the outer surface of the streamline hood outer cover (1) is smooth and streamline.

3. The adjustable resistance hood structure for a fluidized bed boiler according to claim 2, wherein: the air outlet b on the streamline hood outer cover (1) is a conical hole.

4. An adjustable resistance hood structure for a fluidized bed boiler according to claim 3, wherein: the bottom end of the streamline hood outer cover (1) is provided with a slope towards the porous hood inner pipe (3), and the slope angle is less than 8 degrees.

5. An adjustable resistance hood structure for a fluidized bed boiler according to claim 1 or 4, wherein: the air outlet hole a on the multi-hole type blast cap inner pipe (3) is an elliptical hole.

6. An adjustable resistance hood structure for a fluidized bed boiler according to claim 5, wherein: four rows of air inlet holes are sequentially formed in the lower portion of the porous air cap inner pipe (3) from bottom to top, the air inlet holes are round holes, the diameters of the two rows of round holes in the upper portion are the same, and the diameters of the two rows of round holes in the lower portion are the same.

7. An adjustable resistance hood structure for a fluidized bed boiler according to claim 6, wherein: two clamping blocks are welded above each row of air inlet holes on the outer surface of the porous hood inner pipe (3), the longitudinal pitches of the clamping blocks are equal, two rows of clamping grooves matched with the clamping blocks are formed in the adjustable inner pipe sleeve (4) along the circumferential direction, the clamping grooves are in a shape of a Chinese character 'bo', and the longitudinal pitches of the clamping grooves are equal to the longitudinal pitches of the clamping blocks.

8. An adjustable resistance hood structure for a fluidized bed boiler according to claim 1 or 7, wherein: the center of the ash discharging blocking plate (5) is provided with a circular through hole.

Technical Field

The invention relates to the technical field of fluidized bed boilers, in particular to a resistance-adjustable hood structure for a fluidized bed boiler.

Background

For a fluidized bed boiler (hereinafter CFB boiler), the uniformity of the air distribution directly affects the reliability of the boiler. The traditional CFB boiler adopts a large-diameter bell-type hood, the hood outer cover adopts a spherical structure, the phenomenon of blowing over can occur due to insufficient dead weight of some hood outer covers, and the phenomenon that ash, bed materials and the like in the boiler are reversely connected to an air chamber through an inner pipe. And the blast cap outer cover and the inner pipe are provided with holes in only one form, the resistance characteristic of the blast cap is constant, and the cost is huge if the blast cap outer cover and the inner pipe need to be adjusted and modified.

In conclusion, the existing fluidized bed boiler air cap structure has the problems that the air cap is easy to fall off, the ash in the boiler is reversely connected to the air chamber through the inner pipe, and the resistance characteristic of the air cap is constant and difficult to adjust.

Disclosure of Invention

The invention aims to solve the problems that a hood is easy to fall off, furnace ash can be reversely connected to an air chamber through an inner pipe and the resistance characteristic of the hood is constant and difficult to adjust in a fluidized bed boiler hood structure, and further provides a resistance-adjustable hood structure for a fluidized bed boiler.

The technical scheme of the invention is as follows:

a resistance-adjustable hood structure for a fluidized bed boiler comprises a streamline hood outer cover 1, a positioning plate 2, a porous hood inner pipe 3, an adjustable inner pipe sleeve 4 and an ash discharge blocking plate 5, wherein the porous hood inner pipe 3 is vertically arranged, the streamline hood outer cover 1 is buckled at the top of the porous hood inner pipe 3 and is connected through a buckle, the top of the porous hood inner pipe 3 is covered by the porous hood outer cover 1, a plurality of air outlets a are arranged at equal intervals along the circumference, the streamline hood outer cover 1 is arranged at equal intervals along the circumference, the positioning plate 2 is horizontally sleeved on the porous hood inner pipe 3, the lower edge of the streamline hood outer cover 1 is fixedly connected with the streamline porous hood outer cover 1 through the positioning plate 2, a plurality of rows of air inlets are sequentially arranged at the lower part of the streamline hood inner pipe 3 from bottom to top, the adjustable inner pipe sleeve 4 is sleeved at the lower part of the porous hood inner pipe 3 and is connected through the buckle, the ash discharge blocking plate 5 is horizontally fixed on the lower end surface of the porous blast cap inner pipe 3.

Further, the streamline hood housing 1 is in a round table structure, and the outer surface of the streamline hood housing 1 is smooth and streamline.

Further, the air outlet b on the streamline hood housing 1 is a taper hole.

Further, a slope is arranged from the bottom end of the streamline hood outer cover 1 to the porous hood inner pipe 3, and the slope angle is less than 8 degrees.

Further, the air outlet holes a on the inner tube 3 of the multi-hole type blast cap are elliptical holes.

Furthermore, four rows of air inlet holes are sequentially formed in the lower portion of the inner tube 3 of the porous hood from bottom to top, the air inlet holes are round holes, the diameters of the two rows of round holes in the upper portion are the same, and the diameters of the two rows of round holes in the lower portion are the same.

Furthermore, two clamping blocks are welded above each row of air inlet holes on the outer surface of the inner pipe 3 of the multi-hole type blast cap, the longitudinal pitches of the clamping blocks are equal, two rows of clamping grooves matched with the clamping blocks are formed in the adjustable inner pipe sleeve 4 along the circumferential direction, the clamping grooves are in a shape of a Chinese character 'bo', and the longitudinal pitches of the clamping grooves are equal to the longitudinal pitches of the clamping blocks.

Further, a circular through hole is formed in the center of the ash discharging blocking plate 5.

Compared with the prior art, the invention has the following effects:

1. the wind cap can realize multi-stage linear resistance adjustment. The hood structure for the fluidized bed boiler with adjustable resistance can realize multi-stage linear resistance adjustment. By rotating the position of the adjustable inner pipe sleeve 4 on the porous blast cap inner pipe 3, the sectional area of an air inlet at the lower part of the porous blast cap inner pipe 3 can realize 5-gear linear combination, and the on-site resistance adjustment requirement is met.

2. The hood of the invention is stable and can not fall off. The resistance-adjustable hood structure for the fluidized bed boiler adopts a streamline hood outer cover structure, so that vortex is prevented from being generated on the upper part of the hood, and negative pressure is formed. A row of oval air outlet holes a are formed in the upper portion of the multi-hole type hood inner tube 3, the flow cross section area is larger, resistance of wind after passing through the oval air outlet holes a is reduced to be lower, internal thrust borne by the streamline hood outer cover 1 is reduced to be the lowest, and the hood is more stable and cannot fall off.

3. The invention maximizes the outer cover resistance and prevents ash from reversely crossing the inner part of the blast cap. A venthole b that is used for the streamlined hood dustcoat 1 of the adjustable resistance's of fluidized bed boiler hood structure adopts the bell mouth, and venthole b from interior to outer enlarges gradually, compares in the multiplicable streamlined hood dustcoat 1 resistance of traditional round hole, can also prevent that the ash from passing through inside the venthole b anti-cluster to hood. The bottom end of the streamline hood outer cover 1 is arranged towards the slope of the porous hood inner pipe 3, and the slope angle of the bottom end of the streamline hood outer cover 1 is less than 8 degrees. The slope at the bottom end of the outer cover is more favorable for the air flow movement of the inner pipe and the blowing of the residual ash in the blast cap.

4. The wind pressure at the outlet of the hood outer cover is slowly released, so that the whole wind distribution of the wind distribution plate is uniform. The streamline hood outer cover 1 of the hood structure for the fluidized bed boiler with the adjustable resistance is of a round table structure, the outer surface of the streamline hood outer cover 1 is smooth and streamline, the streamline hood is adopted, wind pressure is slowly released, and the wind distribution uniformity has obvious advantages.

Drawings

FIG. 1 is a schematic structural view of a variable resistance hood structure for a fluidized bed boiler according to the present invention;

fig. 2 is a top view of the alignment plate 2 of the present invention;

FIG. 3 is a cross-sectional view at A-A of FIG. 2;

FIG. 4 is a view in the direction of P of FIG. 1;

fig. 5 is a cross-sectional view at M-M of fig. 4.

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 5, and the adjustable resistance hood structure for a fluidized bed boiler of the embodiment comprises a streamline hood outer cover 1, a positioning plate 2, a porous hood inner pipe 3, an adjustable inner pipe sleeve 4 and an ash discharge blocking plate 5, wherein the porous hood inner pipe 3 is vertically arranged, the streamline hood outer cover 1 is buckled at the top of the porous hood inner pipe 3 and is connected with the porous hood inner pipe through a buckle, the part of the top of the porous hood inner pipe 3 covered by the streamline hood outer cover 1 is provided with a plurality of air outlets a at equal intervals along the circumference, the streamline hood outer cover 1 is provided with a plurality of air outlets b at equal intervals along the circumference, the positioning plate 2 is horizontally sleeved on the porous hood inner pipe 3, the lower edge of the streamline hood outer cover 1 is fixedly connected with the streamline hood outer cover 1 through the positioning plate 2, the lower part of the porous hood inner pipe 3 is sequentially provided with a plurality of rows of air inlets from bottom to top, the adjustable inner pipe sleeve 4 is sleeved at the lower part of the porous hood inner pipe 3 and is connected through a buckle, and the ash discharge blocking plate 5 is horizontally fixed on the lower end face of the porous hood inner pipe 3.

The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 5, the streamlined cowl cover 1 of the present embodiment has a truncated cone structure, and the outer surface of the streamlined cowl cover 1 is smooth and streamlined. So set up, the cap dustcoat export wind pressure slowly releases, realizes that the whole cloth wind of wind distribution plate is even. Other components and connections are the same as in the first embodiment.

The third concrete implementation mode: the present embodiment is described with reference to fig. 1 to 5, and the outlet hole b of the streamlined hood cover 1 of the present embodiment is a tapered hole. So set up, venthole b adopts the bell mouth, and venthole b by interior and expand gradually outward, compares in the multiplicable streamlined hood of traditional round hole outer cover 1 resistance, can also prevent that the ash from passing through inside the anti cluster of venthole b to the hood. Other compositions and connections are the same as in the first or second embodiments.

The fourth concrete implementation mode: referring to fig. 1 to 5, the embodiment is described, and the slope angle of the bottom end of the streamline hood outer cover 1 of the embodiment is less than 8 degrees to the porous hood inner pipe 3. So set up, dustcoat bottom slope sets up and more is favorable to inner tube air current motion and blows off remaining ash in the hood. Other compositions and connection relationships are the same as in the first, second or third embodiment.

The fifth concrete implementation mode: referring to fig. 1 to 5, the present embodiment will be described, in which the outlet holes a of the inner tube 3 of the multi-hole blast cap of the present embodiment are elliptical holes. So set up, 3 upper portions on porous formula hood inner tubes adopt a row of oval ventholes a, and the flow cross section is bigger, and wind reduces lower through oval venthole a back resistance, falls to minimumly with the inside thrust that streamlined hood dustcoat 1 bore, and the hood is more firm, can not drop. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.

The sixth specific implementation mode: referring to fig. 1 to 5, the present embodiment is described, and four rows of air inlet holes are sequentially formed in the lower portion of the inner tube 3 of the porous hood of the present embodiment from bottom to top, wherein the air inlet holes are circular holes, the diameters of the circular holes in the upper two rows are the same, and the diameters of the circular holes in the lower two rows are the same. By rotating the position of the adjustable inner pipe sleeve 4 on the porous blast cap inner pipe 3, the sectional area of the air inlet at the lower part of the porous blast cap inner pipe 3 can realize 5-gear linear combination, and the on-site resistance adjustment requirement is met. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.

The 5-gear linear combination of the sectional areas of the air inlet holes is as follows:

	1 st gear	2 nd gear	3 rd gear	4 th gear	5 th gear
						Inner pipe open hole flow cross section combination	2A	3A	4A	5A	6A
Wind cap whole resistance value	Maximum of				Minimum size

Note: 1. the areas of two rows of round holes on the inner tube 3 of the porous blast cap are the same as A, and the areas of two rows of round holes below are the same as 2A.

The seventh embodiment: the embodiment is described with reference to fig. 1 to 5, two fixture blocks are welded above each row of air inlet holes on the outer surface of the inner pipe 3 of the multi-hole type blast cap of the embodiment, the longitudinal pitches of the fixture blocks are equal, two rows of clamping grooves matched with the fixture blocks are circumferentially arranged on the adjustable inner pipe sleeve 4, the clamping grooves are in a shape of a Chinese character 'bo', and the longitudinal pitches of the clamping grooves are equal to the longitudinal pitches of the fixture blocks. According to the arrangement, the adjustable inner pipe sleeve 4 is connected with the multi-hole type blast cap inner pipe 3 through a buckle, and the sectional area of the air inlet hole at the lower part of the multi-hole type blast cap inner pipe 3 can realize 5-gear linear combination by rotating the position of the adjustable inner pipe sleeve 4 on the multi-hole type blast cap inner pipe 3, so that the on-site resistance adjustment requirement is met. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.

The specific implementation mode is eight: the present embodiment will be described with reference to fig. 1 to 5, and a circular through hole is formed in the center of the ash discharging blocking plate 5 of the present embodiment. Other compositions and connection relationships are the same as those of embodiment one, two, three, four, five, six or seven.

Principle of operation

The working principle of the adjustable resistance hood structure for a fluidized bed boiler according to the present invention will be described with reference to fig. 1 to 5: during installation, the porous hood inner pipe 3 is sleeved on the lower portion of the adjustable inner pipe sleeve 4, then the ash discharge blocking plate 5 is horizontally fixed at the bottom end of the porous hood inner pipe 3 in a welding mode, finally the streamline hood outer cover 1 is buckled at the top of the porous hood inner pipe 3, and the streamline hood outer cover 1 and the porous hood inner pipe 3 are welded and fixed through the positioning plate 2.

When the wind-driven generator works, wind from the wind chamber enters from the air inlet holes on the porous wind cap inner tube 3, flows upwards from the porous wind cap inner tube 3, flows out from the air outlet holes a at the top end of the porous wind cap inner tube 3, enters the inner cavity of the streamline wind cap outer cover 1, and flows out from the air outlet holes b of the streamline wind cap outer cover 1.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.