CN100523606C

CN100523606C - Boiler furnace of circulating fluidized bed with water-cooled column

Info

Publication number: CN100523606C
Application number: CNB2007101518130A
Authority: CN
Inventors: 吕清刚; 孙运凯; 包绍麟; 宋国良; 高鸣; 那永洁; 王东宇
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2006-12-07
Filing date: 2007-09-18
Publication date: 2009-08-05
Anticipated expiration: 2027-09-18
Also published as: CN101196297A

Abstract

The furnace of a circulating fluidized bed boiler with a water-cooling column in the present invention, the water-cooling column installed in the furnace can provide a large enough expanded heating area, and at the same time, there is enough space between the columns for the mixing of materials in the lower part of the furnace, so that It can ensure the uniformity of material concentration, temperature and heat transfer in the furnace; the heating conditions of the water cooling column and the heating surface of the surrounding walls of the furnace are very similar, which is especially beneficial to improve the hydrodynamic safety of the supercritical circulating fluidized bed boiler furnace; the water cooling column An air duct can be set inside, and the secondary air can be introduced into the central area of the furnace. In the hearth of the circulating fluidized bed boiler with water-cooling column of the present invention, a vertical water-cooling column enclosed by a membrane wall is arranged between the furnace air distribution plate and the ceiling, and a working medium is passed through the membrane wall tube from bottom to top. , the outer side of the water-cooled column faces the combustion space of the furnace.

Description

The boiler hearth of circulating fluidized bed of band water-cooled column

Technical field

The present invention relates to a kind of CFBB, particularly a kind of boiler hearth of circulating fluidized bed with extended surface.

Background technology

Along with the amplification of boiler capacity, need to arrange more heating surface in the boiler hearth of circulating fluidized bed, to keep rational bed temperature and flue gas temperature of hearth outlet.Simultaneously, boiler capacity is big more, and furnace cross-sectional area is also big more, and the difficulty that secondary wind penetrates burner hearth also increases thereupon, and the burner hearth center easily forms anoxic zones.

For addressing this problem, at large-sized boiler, particularly in the super critical boiler, prior art generally takes to be provided with in lower furnace portion the method for separator, and bed surface is divided into two or more parts, and separator is provided with the air port, adds secondary wind from the bed surface central area; The separator top is provided with heating surface, as the extended surface of water-cooling wall.

But because prior art is separated the burner hearth bed surface, what have also has the also separated heating surface in upper furnace space, and the circulation of the material of burner hearth is a greater impact, and causes the uniformity variation of material concentration, Temperature Distribution and heat transfer in the burner hearth.

Summary of the invention

The objective of the invention is to overcome the defective of prior art, a kind of boiler hearth of circulating fluidized bed with water-cooled column is provided, the water-cooled column in the burner hearth also can have the function that secondary wind is provided to the burner hearth central area concurrently not only as extended surface.

Technical scheme of the present invention is:

A kind of boiler hearth of circulating fluidized bed with water-cooled column, comprise burner hearth front wall, Hou Qiang, both walls, ceiling and air distribution plate, be provided with vertical water-cooled column between its burner hearth air distribution plate and the ceiling, described water-cooled column is surrounded by membrane wall and forms, membrane wall surrounds the space upper and lower end that forms and communicates with atmosphere, be connected with working medium in the membrane wall pipe from bottom to top, the outside of water-cooled column is towards the burner hearth combustion space.

The boiler hearth of circulating fluidized bed of described band water-cooled column, its described water-cooled column is at least one, be provided with along furnace width center line or degree of depth center line, between the water-cooled column and and burner hearth front-back wall, side wall between distance is all arranged.

The boiler hearth of circulating fluidized bed of described band water-cooled column, when its described burner hearth both walls external symmetry was provided with cyclone separator, described water-cooled column was arranged along the furnace depth center line.

The boiler hearth of circulating fluidized bed of described band water-cooled column, when its described back wall was outside equipped with cyclone separator, water-cooled column was arranged along the furnace width center line.

The boiler hearth of circulating fluidized bed of described band water-cooled column, the shape of cross section of its described water-cooled column are square or rectangular, circle, Long Circle, regular hexagon, octagon.

The boiler hearth of circulating fluidized bed of described band water-cooled column is provided with the air channel in its described water-cooled column, and the water-cooled column side is provided with the air port, and the air channel communicates with the air port.

The boiler hearth of circulating fluidized bed of described band water-cooled column, its described air channel surround the pipeline that is provided with in the space that forms for the water-cooled column membrane wall, this pipeline communicates with the air port.

The boiler hearth of circulating fluidized bed of described band water-cooled column, its described air channel is for directly to surround the space that forms by the water-cooled column membrane wall, and this space communicates with the air port.

The boiler hearth of circulating fluidized bed of described band water-cooled column, it also comprises refractory material, is laid with refractory material in the vertical outside, water-cooled column membrane wall bottom, refractory material is identical with the refractory material height that the lower furnace portion water-cooling wall lays.

Compared with prior art, the boiler hearth of circulating fluidized bed of band water-cooled column of the present invention, the water-cooled column that in burner hearth, is provided with, can be when obtaining enough big heating surface area, intercolumniation also leaves the blending that enough spaces are used for the lower furnace portion material, thereby guaranteed the uniformity of material concentration, temperature and heat transfer in the burner hearth, this is even more important for supercritical circulating fluidized bed boiler; Water-cooled column is vertical extended surface, its water-cooled column membrane wall pipe height is consistent with furnace wall cooling, the situation of being heated of the heating surface of wall is closely similar around formed heating surface and the burner hearth, guarantee being heated evenly of burner hearth internal heating surface working medium, be particularly conducive to the hydrodynamic force security that improves supercritical circulating fluidized bed boiler hearth; Be provided with the air channel in the water-cooled column, can feed secondary wind in the burner hearth central area, the air that aftercombustion is required helps burning fully, and reduces the NOx discharging.

Description of drawings

Fig. 1 is the embodiments of the present invention schematic diagram;

Fig. 2 is the schematic diagram of the embodiment of the invention 1;

Fig. 3 is the schematic diagram of the water-cooled column of the embodiment of the invention 1;

Fig. 4 is the schematic diagram of the embodiment of the invention 2.

The specific embodiment

Embodiment 1

Referring to Fig. 1, Fig. 2 and Fig. 3, the boiler hearth of circulating fluidized bed 10 of band water-cooled column of the present invention, comprise burner hearth front wall 11, back wall 13, both walls 12, ceiling 14 and air distribution plate 15, the both walls external symmetry is provided with cyclone separator 20, and back wall rear side is a back-end ductwork 30.

Between burner hearth air distribution plate 15 and the ceiling 14, be provided with two vertical water-cooled columns 100 along burner hearth 10 degree of depth (perpendicular to the direction of burner hearth front-back wall) center line, water-cooled column 100 is to surround the tetragonal prism that forms by membrane wall 1, is not with end face and bottom surface.On the ceiling 14 on the position at corresponding water-cooled column 100 tops and the air distribution plate 15 position of corresponding water-cooled column 100 bottoms punch respectively, water-cooled column inner space 6 is communicated with burner hearth 10 outer atmosphere, to be the burner hearth combustion space by burner hearth front wall 11, back wall 13, side wall 12, ceiling 14, air distribution plate 15 and water-cooled column 100 surround forms, water-cooled column 100 outsides are towards the burner hearth combustion space, and water-cooled column membrane wall 1 inboard is provided with insulation material 4.Be connected with working medium from bottom to top in water-cooled column membrane wall 1 pipe.Consistent with the situation of being heated of furnace wall cooling for guaranteeing water-cooled column 100, the highly identical refractory material 5 of refractory material 16 that lays with the lower furnace portion water-cooling wall is laid in the outside, water-cooled column membrane wall 1 bottom.

Be provided with burning airduct road 2 in the water-cooled column inner space 6, water-cooled column 100 sidewalls are provided with a plurality of air ports that communicate with the air channel 3, and air port 3 is arranged at water-cooled column 100 symmetrically on two walls of burner hearth both walls 12; Air port 3 can be arranged on the sustained height, also can divide highly different multilayer settings.

Similarly, two water-cooled columns among this embodiment also can be a water-cooled column that is arranged at the burner hearth center, and this moment, the air port can be arranged on four sidewalls of water-cooled column; Can also be a plurality of water-cooled columns along furnace depth center line spaced set.

Embodiment 2

Referring to Fig. 1 and Fig. 4, the boiler hearth of circulating fluidized bed 10 of band water-cooled column of the present invention comprises burner hearth front wall 11, back wall 13, both walls 12, ceiling 14 and air distribution plate 15, between back wall 13 and the back-end ductwork 30 cyclone separator 20 is set.

Be provided with a vertical water-cooled column 100 between burner hearth air distribution plate 15 and the ceiling 14, water-cooled column 100 is surrounded by membrane wall and surrounds, and shape of cross section is a Long Circle, and wherein two semicircles are respectively towards burner hearth front wall and Hou Qiang.Be connected with working medium from bottom to top in the water-cooled column membrane wall pipe.The water-cooled column outside is towards the burner hearth combustion space.Consistent with the situation of being heated of furnace wall cooling for guaranteeing water-cooled column, the identical refractory material of refractory material height that lays with the lower furnace portion water-cooling wall is laid in the outside, water-cooled column membrane wall bottom.

Water-cooled column membrane wall pipe top passes between the membrane wall pipe of ceiling 14, water-cooling wall membrane wall pipe bottom passes between air distribution plate 15 water cooling tubes, and water-cooled column membrane wall, ceiling 14, air distribution plate 15 threes are enclosed the water-cooled column inner space 6 that does not communicate with burner hearth outward like this.

Water-cooled column inner space 6 can be used as the air channel, feeds burning from the bottom and uses wind, and the water-cooled column membrane wall is provided with air port 3.At this moment, the position corresponding with water-cooled column 100 bottoms has the passage that feeds with wind for burning on the air distribution plate 15.

Similarly, the water-cooled column shape of cross section among this embodiment can also be rectangle, circle, regular hexagon or octagon.

Claims

1. A circulating fluidized bed boiler furnace with a water cooling column, comprising a furnace front wall (11), a rear wall (13), two side walls (12), a ceiling (14) and an air distribution plate (15), is characterized in that : a vertical water-cooling column (100) is arranged between the furnace air distribution plate (14) and the ceiling (15), and the water-cooling column (100) is surrounded by a membrane wall (1), and the membrane wall ( 1) The upper and lower ends of the enclosed space (6) communicate with the atmosphere, the membrane wall (1) is filled with working fluid from bottom to top, and the outer side of the water-cooled column (100) faces the furnace combustion space.

2. The circulating fluidized bed boiler furnace with water-cooling column according to claim 1, characterized in that: there is at least one water-cooling column (100), which is arranged along the width centerline or depth centerline of the furnace (10), and is water-cooled. There are distances between the columns (100) and between the front and rear walls (11, 13) and side walls (12) of the furnace.

3. The circulating fluidized bed boiler furnace with water-cooling columns as claimed in claim 2, characterized in that: when cyclone separators (20) are symmetrically arranged on the two side walls (12) of the furnace, the water-cooling columns (100) is arranged along the depth center line of the furnace (10).

4. The circulating fluidized bed boiler furnace with water-cooling column as claimed in claim 2, characterized in that: when a cyclone separator (20) is arranged outside the rear wall (13), the water-cooling column (100) along the furnace ( 10) Width centerline arrangement.

5. The circulating fluidized bed boiler furnace with water-cooling column according to claim 1, 2, 3 or 4, characterized in that: the cross-sectional shape of the water-cooling column (100) is square or rectangular, circular, long Circle, regular hexagon, regular octagon.

6. The circulating fluidized bed boiler furnace with water-cooling column as claimed in claim 5, characterized in that: said water-cooling column (100) is provided with an air duct (2), and the side of the water-cooling column (100) is provided with a tuyere ( 3), the air duct (2) communicates with the tuyere (3).

7. The circulating fluidized bed boiler furnace with water-cooling column as claimed in claim 6, characterized in that: said air channel (2) is in the space (6) enclosed by the water-cooling column membrane wall (1) The pipe provided is communicated with the tuyere (3).

8. The circulating fluidized bed boiler furnace with water-cooling column according to claim 1, characterized in that: it also includes a refractory material (5), which is laid outside the lower part of the membrane wall (1) of the vertical water-cooling column (100) A refractory material (5) is arranged, and the refractory material (5) is of the same height as the refractory material (16) laid on the lower water wall of the furnace.