CN218379384U - Hearth structure for circulating fluidized bed boiler - Google Patents
Hearth structure for circulating fluidized bed boiler Download PDFInfo
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- CN218379384U CN218379384U CN202123307910.9U CN202123307910U CN218379384U CN 218379384 U CN218379384 U CN 218379384U CN 202123307910 U CN202123307910 U CN 202123307910U CN 218379384 U CN218379384 U CN 218379384U
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- resistant refractory
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Abstract
The utility model discloses a hearth structure for a circulating fluidized bed boiler, which comprises a water-cooled wall, a wear-resistant refractory brick and a bending structure, wherein the water-cooled wall consists of water-cooled wall tubes and fins which are arranged at intervals; wear-resistant refractory bricks are installed on the heating surface of the water-cooled wall, and the wear-resistant refractory bricks are fixed on the heating surface of the water-cooled wall through heat-resistant reinforcing steel bars; the heat-resistant reinforcing steel bars are welded and fixed on the fins; a plurality of arc-shaped grooves are formed in one side, close to the water-cooled wall, of the wear-resistant refractory brick, a first sealing clamping portion is arranged on one side of the wear-resistant refractory brick, and a second sealing clamping portion is arranged on the other side of the wear-resistant refractory brick; the bending structure is provided with four groups, and the four groups of bending structures are respectively arranged at four included angles at the middle upper part of the heating surface of the water-cooled wall. The utility model provides a pair of furnace structure for circulating fluidized bed boiler can adjust heated area, reduces the furnace cross-section, ensures economic, environmental protection safety of boiler when the low-load operation.
Description
Technical Field
The utility model particularly relates to a furnace structure for circulating fluidized bed boiler belongs to circulating fluidized bed boiler technical field.
Background
Circulating fluidized bed boiler systems are generally composed of a fluidized bed combustor (furnace), a circulating ash separator, a fly ash returning device, a tail heating surface, auxiliary equipment, and the like. The circulating fluidized bed boiler system generally comprises a combustion system and a steam water system, wherein fuel completes the combustion process in the combustion system of the boiler and converts chemical energy into heat energy of flue gas through combustion so as to heat working media; the function of the steam-water system is to absorb the heat of the flue gas through the heated surface to complete the process of converting the working medium from water into saturated steam and then into superheated steam.
At present, more circulating fluidized bed boilers are put into operation, and some boilers are influenced by objective factors and can only operate in a low-load state. Despite the capability of low load operation of the boiler, there is a large variation in boiler operating parameters. When boiler equipment runs in a low-load state for a long time, the heat transfer coefficients of all parts of a boiler can be changed, so that the problems of unstable combustion, reduced heat efficiency, low-temperature corrosion of a tail hot surface and the like are easily caused. The lower temperature in the hearth can also reduce the denitration efficiency of the SNCR in the furnace, and the normal operation of tail environment-friendly equipment is influenced.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to not enough in the background art, provide a furnace structure for circulating fluidized bed boiler, can adjust heated area, reduce the furnace cross-section, ensure economy, environmental protection safety of boiler when the low-load operation.
For solving the technical problem, the utility model discloses a following technical scheme:
a hearth structure for a circulating fluidized bed boiler comprises a water-cooled wall, a wear-resistant refractory brick and a bending structure, wherein the water-cooled wall consists of water-cooled wall tubes and fins which are arranged at intervals;
the heating surface of the water-cooled wall is provided with wear-resistant refractory bricks, and the wear-resistant refractory bricks are fixed on the heating surface of the water-cooled wall through heat-resistant reinforcing steel bars; the heat-resistant reinforcing steel bars are welded and fixed on the fins;
a plurality of arc-shaped grooves are formed in one side, close to the water-cooled wall, of the wear-resistant refractory brick, a first sealing clamping portion is arranged on one side of the wear-resistant refractory brick, and a second sealing clamping portion is arranged on the other side of the wear-resistant refractory brick;
the four groups of bending structures are respectively arranged at four included angles at the middle upper part of the heating surface of the water-cooled wall.
An optimization scheme, two adjacent wear-resisting resistant firebricks along the horizontal direction cooperate through first sealed joint portion and the sealed joint portion of second.
Furthermore, the wear-resistant refractory bricks are provided with reserved mounting holes which penetrate through the wear-resistant refractory bricks along the horizontal direction, and the reserved mounting holes are used for penetrating through the heat-resistant reinforcing steel bars.
Furthermore, the number of the reserved mounting holes is four, two reserved mounting holes are arranged along the upper part and the lower part, and the aperture of each reserved mounting hole is 12mm.
Furthermore, the bending structure is composed of a bending pipe and a refractory pouring layer on the heating surface of the bending pipe.
Furthermore, the elbow is composed of a vertical pipe in the middle and elbows at two ends, and the elbow is communicated with an external water wall pipe.
Further, the arc-shaped groove is adaptive to the shape of the water wall tube.
The utility model adopts the above technical scheme after, compare with prior art, have following advantage:
the utility model effectively cooperates two structures to reduce the heating area in the hearth, reduce the sectional area of the hearth and adjust the flow rate of flue gas in the hearth;
the first structure is that wear-resistant refractory bricks are additionally arranged on the water-cooled wall, and the prefabricated wear-resistant refractory bricks are directly installed through heat-resistant steel bars to cover the heating surface of the water-cooled wall, so that the installation process is simple and rapid; the second structure is that a bending structure is added at the included angle of the water wall; the two structures ensure that the temperature of the hearth reaches 850-900 ℃ when the boiler operates at low load, solve the problems that the temperature of the hearth and the temperature of exhaust gas at the tail part are low when the boiler operates at low load, and the denitration efficiency is low due to low temperature and the cost is high, improve the temperature of the flue gas at the hearth and the tail part, and ensure the stable and efficient operation of the boiler.
The wear-resistant refractory brick and the bending structure have the characteristics of being convenient to remove and restore the original structure of the hearth, and when the boiler needs to operate at full load, the wear-resistant refractory brick and the bending structure are easy and feasible to remove and restore.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the installation of the wear resistant refractory brick;
FIG. 3 is a schematic cross-sectional view taken at B-B of FIG. 2;
FIG. 4 is a front view of the construction of a wear resistant refractory brick;
FIG. 5 is a top view of a construction of a wear resistant refractory brick;
FIG. 6 isbase:Sub>A schematic cross-sectional view taken at A-A of FIG. 1;
fig. 7 is a schematic view of a bent pipe.
In the figure, 1-water cooling wall, 11-water cooling wall pipe, 12-fin, 2-wear-resistant refractory brick, 21-arc groove, 22-first sealing clamping part, 23-second sealing clamping part, 24-reserved mounting hole, 3-heat-resistant steel bar, 4-bending structure, 41-bending pipe and 42-fire-resistant pouring layer.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in figures 1-7 together, the utility model provides a furnace structure for a circulating fluidized bed boiler, which comprises a water-cooled wall 1, a wear-resistant refractory brick 2 and a bending structure 4.
The water wall 1 is composed of water wall tubes 11 and fins 12 which are arranged at intervals.
The heating surface of the water-cooled wall 1 is provided with a wear-resistant refractory brick 2; the wear-resistant refractory brick 2 is fixed on the heating surface of the water-cooled wall 1 through a heat-resistant steel bar 3; the heat-resistant reinforcing steel bars 3 are welded and fixed on the fins 12.
The prefabricated wear-resistant refractory bricks 2 are directly installed through the heat-resistant reinforcing steel bars 3 to cover the heating surface of the water-cooled wall 1, and the installation process is simple and rapid.
The wear-resistant refractory bricks 2 are provided with reserved mounting holes 24 which penetrate through the wear-resistant refractory bricks in the horizontal direction, and the reserved mounting holes 24 are used for penetrating through the heat-resistant reinforcing steel bars 3.
The number of the reserved mounting holes 24 is four, two reserved mounting holes are arranged along the upper part and the lower part, and the aperture of each reserved mounting hole 24 is 12mm.
One side of the wear-resistant refractory brick 2 close to the water wall 1 is provided with a plurality of arc-shaped grooves 21, and the arc-shaped grooves 21 are adapted to the shape of the water wall tube 11.
One side of the wear-resistant refractory brick 2 is provided with a first sealing clamping portion 22, the other side of the wear-resistant refractory brick 2 is provided with a second sealing clamping portion 23, and two adjacent wear-resistant refractory bricks 2 in the horizontal direction are matched through the first sealing clamping portion 22 and the second sealing clamping portion 23, so that the sealing performance of the joint is ensured.
The utility model discloses can be according to boiler actual load's needs, through the heating power calculation check back, confirm wear-resisting resistant firebrick 2 and in furnace receives the covering position and the coverage area of hot side, the specification and the quantity of the fire-resisting wear-resisting firebrick 2 of directional design.
Four groups of yielding structures 4 are arranged, and the four groups of yielding structures 4 are respectively arranged at four included angles of the middle upper part of the heating surface of the water-cooled wall 1; the bending structure 4 consists of a bending pipe 41 and a refractory pouring layer 42 on the heating surface of the bending pipe 41; the bent pipe 41 is composed of a vertical pipe in the middle and elbows at both ends, and the bent pipe 41 is communicated with the external water wall pipe 11.
When the bending structure 4 of the utility model is installed, the water wall pipes 11 at the two side parts of the front wall and the back wall are firstly disconnected, the bending pipe 41 is connected, the grabbing nails are welded on the heating surface of the bending pipe 41, a reinforcing steel bar grid is manufactured, and then a fireproof pouring layer 42 is poured; the raw water cooling wall 1 is kept still, and the heating surface in the hearth and the sectional area of the hearth are reduced by adding the bending structure 4, so that the temperature of the hearth reaches 850-900 ℃ when the boiler operates at low load, and the boiler can operate economically, environmentally and safely.
The utility model discloses a concrete theory of operation:
the utility model effectively cooperates two structures to reduce the heating area in the hearth, reduce the sectional area of the hearth and adjust the flow rate of flue gas in the hearth;
the first structure is that the wear-resistant refractory bricks 2 are additionally arranged on the water-cooled wall 1, the prefabricated wear-resistant refractory bricks 2 are directly installed through the heat-resistant steel bars 3 to cover the heating surface of the water-cooled wall 1, and the installation process is simple and rapid; the second structure is that a bending structure 4 is added at the included angle of the water wall 1;
the two structures ensure that the temperature of a hearth reaches 850-900 ℃ when the boiler operates at low load, and the boiler can operate economically, environmentally and safely;
the wear-resistant refractory bricks 2 and the bending structures 4 have the characteristics of being convenient to remove and restore the original structure of the hearth, and when the boiler needs to operate at full load, the wear-resistant refractory bricks 2 and the bending structures 4 are simple and easy to remove and restore.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (7)
1. The utility model provides a furnace structure for circulating fluidized bed boiler, includes water-cooling wall (1), and water-cooling wall (1) comprises water-cooling wall pipe (11) and fin (12) that the interval set up, its characterized in that: the wear-resistant refractory brick further comprises a wear-resistant refractory brick (2) and a bending structure (4);
wear-resistant refractory bricks (2) are installed on the heating surface of the water-cooled wall (1), and the wear-resistant refractory bricks (2) are fixed on the heating surface of the water-cooled wall (1) through heat-resistant reinforcing steel bars (3); the heat-resistant reinforcing steel bars (3) are welded and fixed on the fins (12);
a plurality of arc-shaped grooves (21) are formed in one side, close to the water-cooled wall (1), of the wear-resistant refractory brick (2), a first sealing clamping portion (22) is arranged on one side of the wear-resistant refractory brick (2), and a second sealing clamping portion (23) is arranged on the other side of the wear-resistant refractory brick (2);
the four groups of the yielding structures (4) are arranged, and the four groups of the yielding structures (4) are respectively arranged at four included angles at the middle upper part of the heating surface of the water-cooled wall (1).
2. The hearth structure for a circulating fluidized bed boiler of claim 1, wherein: two adjacent wear-resistant refractory bricks (2) in the horizontal direction are matched through a first sealing clamping portion (22) and a second sealing clamping portion (23).
3. The hearth structure for a circulating fluidized bed boiler of claim 1, wherein: the wear-resistant refractory bricks (2) are provided with reserved mounting holes (24) which penetrate through the wear-resistant refractory bricks in the horizontal direction, and the reserved mounting holes (24) are used for penetrating through the heat-resistant reinforcing steel bars (3).
4. The hearth structure for a circulating fluidized bed boiler according to claim 3, wherein: the number of the reserved mounting holes (24) is four, the number of the reserved mounting holes is two along the upper part and the lower part, and the aperture of each reserved mounting hole (24) is 12mm.
5. The hearth structure for a circulating fluidized bed boiler according to claim 1, wherein: the bending yielding structure (4) is composed of a bending yielding pipe (41) and a refractory pouring layer (42) on the heating surface of the bending yielding pipe (41).
6. The hearth structure for a circulating fluidized bed boiler of claim 5, wherein: the bent pipe (41) is composed of a vertical pipe in the middle and elbows at two ends, and the bent pipe (41) is communicated with the external water wall pipe (11).
7. The hearth structure for a circulating fluidized bed boiler according to claim 1, wherein: the arc-shaped groove (21) is adapted to the shape of the water wall tube (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123307910.9U CN218379384U (en) | 2021-12-27 | 2021-12-27 | Hearth structure for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123307910.9U CN218379384U (en) | 2021-12-27 | 2021-12-27 | Hearth structure for circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218379384U true CN218379384U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123307910.9U Active CN218379384U (en) | 2021-12-27 | 2021-12-27 | Hearth structure for circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218379384U (en) |
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2021
- 2021-12-27 CN CN202123307910.9U patent/CN218379384U/en active Active
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