Smoke guiding device applied to boiler furnace outlet

Abstract

The utility model discloses a flue gas diversion device applied to a boiler furnace outlet, which is arranged on a flue gas yielding pipe, the flue gas yielding pipe consists of a plurality of light pipes and comprises a plurality of diversion folded plates which are longitudinally arranged at intervals, and each diversion folded plate comprises a transverse plate and an angle folded plate. A plurality of through holes matched with the light pipes are formed in the transverse plate, the light pipes are sleeved with the transverse plate, the transverse plate is connected with the light pipes, the angle folded plate is located above the low-temperature superheater, the first end of the angle folded plate is connected with the transverse plate, and the second end of the angle folded plate is obliquely arranged downwards. According to the low-temperature superheater, the flow guide folded plate is arranged on the flue gas bypass pipe, so that the flue gas is more uniformly distributed above the low-temperature superheater under the guidance of the flow guide folded plate, and the phenomenon of local overheating or non-uniform cooling is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler technical field, concretely relates to a flue gas flow guide device for boiler hearth outlet. BACKGROUND

[0002] The boiler flue gas will pass through the "flue gas let pipe" of the furnace outlet smoke window along the horizontal direction from the hearth, reach the upper turning chamber of the back flue, pass through the turning chamber, and the direction of the flue gas is changed by 90 degrees and is changed to downward. Due to the influence of the turning of the flue gas, the flue gas flow field of the heating surface located in the lower part of the turning chamber will change, the flue gas flow of the part close to the front of the furnace is less, and the flue gas flow of the part close to the back of the furnace is more (see Figure 1 "flue gas distribution schematic before installing the flow guide plate").

[0003] The uneven flue gas flow causes the uneven heat exchange of the tube panel close to the front of the furnace and the tube panel close to the back of the furnace due to the uneven flue gas flow field, and further causes the uneven flue gas temperature field. The uneven flue gas flow field and temperature field will exacerbate the deviation of the heating surface tube steam temperature, easily cause the local overheating of the heating surface tube and even damage the heating surface, and affect the normal use of the boiler. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a flue gas flow guide device for boiler hearth outlet to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides a flue gas flow guide device for boiler hearth outlet, which is arranged on the flue gas let pipe, the flue gas let pipe is composed of a plurality of light pipes, and it comprises a plurality of longitudinally spaced flow guide folding plates, the flow guide folding plate comprises a horizontal plate and an angle folding plate, a plurality of through holes corresponding to the plurality of light pipes are formed in the horizontal plate, the horizontal plate is sleeved on the plurality of light pipes and connected with the plurality of light pipes respectively, the angle folding plate is located above the low-temperature superheater, the first end of the angle folding plate is connected with the horizontal plate, and the second end of the angle folding plate is inclined downward.

[0006] Further, a plurality of supporting plates are arranged, the plurality of supporting plates correspond to the plurality of flow guide folding plates one by one, the supporting plate is arranged between the flue gas let pipe and the angle folding plate, and the two ends of the supporting plate are connected with the flue gas let pipe and the angle folding plate respectively.

[0007] Further, the horizontal plate is composed of a plurality of comb-shaped plates.

[0008] Further, the plurality of comb-shaped plates comprise single-sided comb-shaped plates and double-sided comb-shaped plates, the first side of the single-sided comb-shaped plate is provided with a comb-shaped semicircular groove adapted to the light pipe, the first side of the single-sided comb-shaped plate is connected to the light pipe, both sides of the double-sided comb-shaped plate are provided with comb-shaped semicircular grooves adapted to the light pipe, and both sides of the double-sided comb-shaped plate are connected to the light pipe.

[0009] Further, a plurality of positioning blocks are arranged on the flue gas allowing pipe to position the plurality of flow guide flaps.

[0010] Further, the inclination angles of the plurality of angle flaps are different.

[0011] The utility model discloses the beneficial effect is: the utility model discloses a flow guide flap is arranged on the flue gas allowing pipe, and the distribution of the flue gas is more uniform above the low-temperature superheater through the guidance of flow guide flap, and the local overheating or uneven cooling phenomenon is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of the utility model embodiment.

[0013] Figure 2 It is the first partial structural schematic diagram of the utility model embodiment.

[0014] Figure 3 It is the second partial structural schematic diagram of the utility model embodiment.

[0015] Wherein: 1, flow guide flap;2, support plate;3, positioning block;4, flue gas allowing pipe.

[0016] 101, double-sided comb-shaped plate;102, single-sided comb-shaped plate;103, angle flap. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the embodiments of the utility model, and obviously, the described embodiments are only one embodiment of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0019] In the following description, reference has been made to "one embodiment", "an embodiment", "one example", "an example" etc. which means that a particular feature, structure, characteristic, property, element or limitation described in connection with the embodiment or example can be included in at least one embodiment or example of the application. Furthermore, the appearances of the phrase "according to an embodiment of the present application" in various places in the specification are likely to not necessarily refer to the same embodiment.

[0020] As shown in Figures 1-3 The utility model discloses a kind of smoke flow guiding device applied to boiler furnace outlet is arranged on smoke let pipe 4, smoke let pipe 4 is composed of multiple light pipes, it includes multiple longitudinal interval arrangement's flow guide baffle 1, i.e. flow guiding device is arranged multiple layers on smoke let pipe 4. Flow guide baffle 1 includes horizontal plate and angle baffle 103, multiple through holes suitable for multiple light pipes are opened on horizontal plate, horizontal plate is set on multiple light pipes, and is connected with multiple light pipes respectively, angle baffle 103 is located above low-temperature superheater, the first end of angle baffle 103 is connected with horizontal plate, the second end of angle baffle 103 is downwardly inclined arrangement.

[0021] Smoke let pipe 4 is "smoke let pipe 4" pipe row of furnace outlet smoke window, by about forty groups, and each group is composed of four light pipes. This part of pipe is part of boiler rear wall membrane wall pipe, to leave passage for flue gas, in the upper portion of furnace rear wall, every four pipes are arranged in left-right direction, pass through pipe jump, change into front-back direction, and there is no fin between pipes, form flue gas passage. Horizontal plate is inserted into multiple light pipes, and is connected with multiple light pipes respectively, then angle baffle 103 is installed, the first end of angle baffle 103 is connected with horizontal plate, and the second end of angle baffle 103 is suspended, interferes with the flow direction of flue gas, changes the flow direction of flue gas. The number of flow guide baffle 1 and the spacing between adjacent flow guide baffles 1 are determined by actual flow field analysis.

[0022] The utility model sets up flow guide baffle 1 on smoke let pipe 4, by the guidance of flow guide baffle 1, the distribution of flue gas above low-temperature superheater is more uniform, and the phenomenon of local overheating or uneven cooling is reduced.

[0023] In an embodiment, it further includes a plurality of support plates 2, the plurality of support plates 2 correspond to the plurality of flow guide baffles 1 one by one, the support plate 2 is arranged between smoke let pipe 4 and angle baffle 103, and the two ends of the support plate 2 are connected with the smoke let pipe 4 and the angle baffle 103 respectively. The stability of the flow guide baffle 1 is enhanced, so that the entire smoke flow guiding device is more firm, and the operation safety of the boiler is improved. At the same time, the vibration and noise generated by the flow of flue gas are reduced.

[0024] In an embodiment, the horizontal plate is composed of multiple comb-shaped plates, which is convenient for manufacturing, transportation and installation.

[0025] In one embodiment, the plurality of comb-shaped plates comprises single-sided comb-shaped plates 102 and double-sided comb-shaped plates 101, the first side of the single-sided comb-shaped plates 102 is provided with comb-shaped semicircular grooves adapted to the light pipe, the first side of the single-sided comb-shaped plates 102 is connected with the light pipe, both sides of the double-sided comb-shaped plates 101 are provided with comb-shaped semicircular grooves adapted to the light pipe, and both sides of the double-sided comb-shaped plates 101 are connected with the light pipe, facilitating manufacturing and installation.

[0026] In consideration of the expansion problem, the length of the comb-shaped plate should not be too long, and therefore a plurality of single-sided comb-shaped plates 102 and double-sided comb-shaped plates 101 are provided and spliced and installed into a horizontal plate according to actual conditions. Both sides of the double-sided comb-shaped plates 101 are assembled and welded with the light pipe, and the first side of the single-sided comb-shaped plates 102 is assembled and welded with the light pipe. The side of the single-sided comb-shaped plates 102 without comb-shaped semicircular grooves is the reserved expansion gap side and is not welded.

[0027] In one embodiment, a plurality of positioning blocks 3 are further included, and the plurality of positioning blocks 3 are installed on the flue gas allowing pipe 4 and used for height positioning of the plurality of flow guide flaps 1. In the embodiment, the positioning blocks 3 are welded at the same height on the pipe row of the flue gas allowing pipe 4 before the single-sided comb-shaped plates 102 and the double-sided comb-shaped plates 101 are installed. The purpose of the positioning blocks 3 is to ensure the flatness of the single-layer flow guide device and facilitate the installation of the comb-shaped plates.

[0028] In one embodiment, the inclination angles of the plurality of angle flaps 103 are different. Since the inclination angles of the angle flaps 103 are different, they will produce different guiding effects on the flue gas, thereby adapting to the flow direction of flue gas at different heights. The inclination angles of the angle flaps 103 are determined by actual flow field analysis.

[0029] The design idea of the utility model is as follows:

[0030] In order to improve the unevenness of flue gas and balance the heating uniformity of the heating surface, the device needs to interfere with the flow direction of flue gas before the flue gas enters the turning chamber. That is, the flow guide flaps 1 are added on the “flue gas allowing pipe 4” of the flue gas window at the furnace outlet, and the flow direction of the flue gas is changed, which is an effective way to eliminate unevenness of flue gas and improve temperature distribution.

[0031] According to the actual flow field analysis, the number of layers of the flow guide device, i.e. the number of the flow guide folding plates 1 and the support plates 2, the spacing between adjacent flow guide folding plates 1, and the inclination angle of the angle folding plate 103 of each layer are determined. Then the positions on the tube row of the flue gas allowing pipe 4 are determined, and the positioning blocks 3 are welded at the same elevation. After the welding of the plurality of positioning blocks 3 is completed, the single-sided comb-shaped plate 102 and the double-sided comb-shaped plate 101 are installed. The double-sided comb-shaped plate 101 is assembled and welded with the light pipe on both sides, the single-sided comb-shaped plate 102 is assembled and welded with the light pipe on the first side, the single-sided comb-shaped plate 102 without the comb-shaped semicircular groove on the side is the reserved expansion gap side and is not welded, and the single-sided comb-shaped plate 102 and the double-sided comb-shaped plate 101 are installed to form a horizontal plate. Then one end of the support member is connected with the flue gas allowing pipe 4, and finally the angle folding plate 103 is installed, so that the first end of the angle folding plate 103 is connected with the horizontal plate, and the second end of the angle folding plate 103 is connected with the other end of the support member, thereby forming a complete flow guide device.

[0032] The flow guide folding plate 1 is arranged on the flue gas allowing pipe 4, and the flue gas is more uniformly distributed above the low-temperature superheater through the guidance of the flow guide folding plate 1, thereby reducing the phenomenon of local overheating or uneven cooling.

[0033] The above description of the disclosed embodiments is for a person skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue gas flow guiding device applied to the outlet of a boiler furnace, arranged on a flue gas duct, the flue gas duct being composed of a plurality of light tubes, characterized in that: The device comprises a plurality of longitudinally spaced flow guide flaps, which comprise a horizontal plate and an angle flap, the horizontal plate is provided with a plurality of through holes corresponding to the light pipes, the horizontal plate is sleeved on the light pipes and connected with the light pipes respectively, the angle flap is located above the low-temperature superheater, the first end of the angle flap is connected with the horizontal plate, and the second end of the angle flap is inclined downward.

2. A flue gas flow guiding device for use at the outlet of a boiler furnace according to claim 1, characterized in that The device further comprises a plurality of support plates corresponding to the flow guide flaps, the support plates are arranged between the flue gas allowing pipes and the angle flaps, and the two ends of the support plates are connected with the flue gas allowing pipes and the angle flaps respectively.

3. A flue gas flow guiding device for use at the outlet of a boiler furnace according to claim 1, characterized in that The horizontal plate is composed of a plurality of comb-shaped plates.

4. A flue gas flow guiding device for use at the outlet of a boiler furnace according to claim 3, characterized in that The plurality of comb-shaped plates comprise single-sided comb-shaped plates and double-sided comb-shaped plates, the first side of the single-sided comb-shaped plate is provided with a comb-shaped semicircular groove corresponding to the light pipe, the first side of the single-sided comb-shaped plate is connected with the light pipe, and the two sides of the double-sided comb-shaped plate are both provided with comb-shaped semicircular grooves corresponding to the light pipe, and the two sides of the double-sided comb-shaped plate are both connected with the light pipe.

5. A flue gas flow guiding device for use at the exit of a boiler furnace according to claim 1, characterized in that: The device further comprises a plurality of positioning blocks, which are installed on the flue gas allowing pipes and used for height positioning of the flow guide flaps.

6. A flue gas flow guiding device for use at the exit of a boiler furnace according to claim 1, characterized in that: The inclination angles of the plurality of angle flaps are different.

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