Flue of biomass boiler

Abstract

The utility model discloses a flue of a biomass boiler. The flue comprises a first flue body defined by an inner membrane type wall, a second flue body defined by an outer membrane type wall and the inner membrane type wall, a third flue body defined by the outer membrane type wall and a middle partition plate, and a fourth flue body defined by the middle partition plate and an outer wall plate. The first flue and the second flue are communicated through a first smoke passing hole in the bottom of the inner membrane type wall, the second flue and the third flue are communicated through a second smoke passing hole in the top of the outer membrane type wall, and the third flue and the fourth flue are communicated through a third smoke passing hole in the bottom of the middle partition plate. The device has the beneficial effects that the top of the fourth flue, the top plate at the top of the inner membrane type wall and the fixing plate at the top of the middle partition plate define a heating space of the gas collecting pipe and the gas collecting bag, a structure for heating by utilizing flue gas is provided for the gas collecting pipe and the gas collecting bag, and the steam-water separation efficiency in the gas collecting pipe and the gas collecting bag is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flue technical field of membrane wall structure steam boiler, especially relates to a flue of biomass boiler. BACKGROUND

[0002] For the biomass boiler of membrane wall structure, due to the unstable calorific value of biomass fuel, steam pressure fluctuation is caused, such as steam pressure jumps in 1.0~4.0MPa, which will cause the imbalance of two-phase flow state in the separator of the water and steam separation in the membrane wall, that is, water and steam chaos, cause the separation efficiency to drop sharply, humidity exceeds the standard, and water hammer phenomenon will also impact the pipeline, cause steam separation unqualified, and steam contains excessive moisture, for this phenomenon, the prior art adds steam pressure tank at the inlet of the separator to suppress pressure fluctuation, but such a solution causes the increase of the auxiliary equipment of the boiler, and the structure is complex, in order to solve this problem, the inventor designs a heating pipeline of biomass boiler, the gas collecting pocket and gas collecting pipe are designed in the heating range in this heating pipeline, and the existing flue structure cannot heat the gas collecting pocket and gas collecting pipe. SUMMARY

[0003] The utility model embodiment purposes at providing a kind of flue of biomass boiler, to solve the technical problem that heating pipeline gas collecting pocket and gas collecting pipe are designed in the heating range, and the existing flue structure cannot heat gas collecting pocket and gas collecting pipe.

[0004] The utility model embodiment is realized as follows:

[0005] A kind of flue of biomass boiler, the flue includes the first flue surrounded by inner membrane wall, the second flue surrounded by outer membrane wall and inner membrane wall, the third flue surrounded by outer membrane wall and middle partition, and the fourth flue surrounded by middle partition and outer wall plate;First flue and second flue are communicated by the first smoke hole in the bottom of inner membrane wall, second flue and third flue are communicated by the second smoke hole in the top of outer membrane wall, third flue and fourth flue are communicated by the third smoke hole in the bottom of middle partition;The top of fourth flue, with the top plate of the top of inner membrane wall and the fixed plate of the top of middle partition, surrounds the heating space of gas collecting pipe and gas collecting pocket, first flue is connected with burner by flue gas passage, and the tail of fourth flue is equipped with smoke exhaust hole.

[0006] Further, the sidewall of the first flue is provided with flue gas passage, flue gas passage is fixed between inner membrane wall and outer membrane wall 1, flue gas passage penetrates second flue, third flue and fourth flue, and connects inner membrane wall with outside, and burner is fixed at the communication place.

[0007] Further, the inner membrane wall and the outer membrane wall are both formed by welding water pipes and wall plates; the water pipes and wall plates of the inner membrane wall and the water pipes of the outer membrane wall are connected at the upper header; the wall plates of the outer membrane wall are not in contact with the upper header, and the gap between the wall plates of the outer membrane wall and the upper header is the second smoke passing hole; the water pipes and wall plates of the outer membrane wall and the water pipes of the inner membrane wall are connected at the lower header; the wall plates of the inner membrane wall are not in contact with the lower header, and the gap between the wall plates of the inner membrane wall and the lower header is the first smoke passing hole.

[0008] Further, the middle partition plate and the outer wall plate are in rectangular or circular tube shape.

[0009] Further, the bottom of the first flue is provided with an ash filter plate at the position of the lower header, which is used for filtering the ash in the flue gas into the collection box at the bottom.

[0010] Further, the bottom of the outer wall plate is provided with a bottom plate, which surrounds the third flue and the fourth flue and bears the third flue and the fourth flue; the bottom of the outer wall plate is provided with a cover plate, which is divided into a first cover plate and a second cover plate, and the lower part of the gas collecting pocket and the gas collecting pipe are both closed in the heating space by the first cover plate and the second cover plate.

[0011] The positive effect of the utility model is: the heating space of the gas collecting pipe and the gas collecting pocket is surrounded by the top of the fourth flue, the top plate of the top of the inner membrane wall and the fixed plate of the top of the middle partition plate, which provides the structure of heating by flue gas for the gas collecting pipe and the gas collecting pocket, improves the steam-water separation efficiency in the gas collecting pipe and the gas collecting pocket, realizes the reuse of flue gas and achieves the effect of energy saving; meanwhile, the middle partition plate guides the flue gas from the top of the outer membrane wall to the bottom, which heats the outer membrane wall from the outside again, so that the inner membrane wall and the outer membrane wall are both heated from both sides, the heating area is increased, heat exchange is fully carried out, which is beneficial to the effective use of heat and achieves the effect of energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structure diagram of the flue of the utility model biomass boiler.

[0013] Figure 2 is Figure 1 the utility model biomass boiler flue shown in the figure.

[0014] Legend: 1 - outer membrane wall, 101 - second smoke passing hole, 2 - inner membrane wall, 201 - first smoke passing hole, 3 - middle partition plate, 301 - third smoke passing hole, 4 - bottom plate, 5 - lower header, 6 - ash filter plate, 7 - burner, 8 - flue gas passage, 9 - top plate, 10 - gas collecting pocket, 11 - cover plate, 12 - fixed plate, 13 - upper header, 14 - outer wall plate, 15 - smoke exhaust hole. DETAILED DESCRIPTION

[0015] The utility model will be described in detail below in combination with the drawings and specific embodiments:

[0016] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0017] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model will be further described in detail below in combination with the drawings and embodiments.It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0018] As shown in Figure 1 and Figure 2 , it is a structure diagram of the flue of a biomass boiler provided by the embodiment of the utility model, the flue includes the first flue surrounded by the inner membrane wall 2, the second flue surrounded by the outer membrane wall 1 and the inner membrane wall 2, the third flue surrounded by the outer membrane wall 1 and the partition plate 3, and the fourth flue surrounded by the partition plate 3 and the outer wall plate 1; the first flue and the second flue are communicated through the first smoke passing hole 201 at the bottom of the inner membrane wall, the second flue and the third flue are communicated through the second smoke passing hole 101 at the top of the outer membrane wall, and the third flue and the fourth flue are communicated through the third smoke passing hole 301 at the bottom of the partition plate; the top of the fourth flue, the top plate 9 at the top of the inner membrane wall 2 and the fixed plate 12 at the top of the partition plate 3 surround the heating space of the gas collecting pipe and the gas collecting bag 10.

[0019] In the embodiment of the utility model, the top of the fourth flue, the top plate 9 at the top of the inner membrane wall 2 and the fixed plate 12 at the top of the partition plate 3 surround the heating space of the gas collecting pipe and the gas collecting bag 10, which provides the structure of the gas collecting pipe and the gas collecting bag 10 for heating by using flue gas, improves the steam-water separation efficiency in the gas collecting pipe and the gas collecting bag, realizes the reuse of flue gas, and achieves the effect of energy saving; at the same time, the partition plate is used to guide the flue gas from the top to the bottom of the outer membrane wall 1, which heats the outer membrane wall 1 from the outside again, so that the inner membrane wall and the outer membrane wall are heated on both sides at the same time, the heating area is increased, heat exchange is fully carried out, which is beneficial to the effective use of heat and achieves the effect of energy saving.

[0020] Specifically, as shown in Figure 1 and Figure 2 a flue of a biomass boiler, the flue comprises a first flue surrounded by an inner membrane wall 2, a second flue surrounded by an outer membrane wall 1 and the inner membrane wall 2, a third flue surrounded by the outer membrane wall 1 and a partition 3, and a fourth flue surrounded by the partition 3 and the outer wall 1; the first flue and the second flue are communicated through a first smoke passing hole 201 at the bottom of the inner membrane wall, the second flue and the third flue are communicated through a second smoke passing hole 101 at the top of the outer membrane wall, and the third flue and the fourth flue are communicated through a third smoke passing hole 301 at the bottom of the partition; the top of the fourth flue, together with a top plate 9 at the top of the inner membrane wall 2 and a fixed plate 12 at the top of the partition 3, forms a heating space of a gas collecting pipe and a gas collecting package 10.

[0021] The inner membrane wall 2 and the outer membrane wall 1 are both welded by water pipes and wall plates; the water pipes and wall plates of the inner membrane wall 2 and the water pipes of the outer membrane wall are communicated at an upper collecting pipe 13, while the wall plates of the outer membrane wall are not in contact with the upper collecting pipe 13, and the gap between the wall plates of the outer membrane wall and the upper collecting pipe 13 is the second smoke passing hole 101; the water pipes and wall plates of the outer membrane wall and the water pipes of the inner membrane wall are communicated at a lower collecting pipe 5, while the wall plates of the inner membrane wall are not in contact with the lower collecting pipe 5, and the gap between the wall plates of the inner membrane wall and the lower collecting pipe 5 is the first smoke passing hole 201.

[0022] The side wall of the first flue is provided with a flue gas passage 8, which is fixed between the inner membrane wall 2 and the outer membrane wall 1, penetrates the second flue, the third flue and the fourth flue, and communicates the inner membrane wall with the outside, and a burner 7 is fixed in the communication, the flue gas generated by the burner 7 enters the first flue through the flue gas passage 8, and the top of the inner membrane wall 2 is provided with a top plate 9, so that the flue gas can only flow downward.

[0023] The first smoke passing hole 201 at the bottom of the inner membrane wall communicates the first flue and the second flue, so that the flue gas enters the bottom of the second flue through the first smoke passing hole 201, then rises along the second flue, enters the third flue through the second smoke passing hole 101, then enters the fourth flue through the third smoke passing hole 301, and then rises along the fourth flue to enter the heating space of the gas collecting pipe and the gas collecting package 10, heats the gas collecting pipe and the gas collecting package 10, and then is discharged from the smoke exhaust hole 15.

[0024] The foregoing has broadly outlined some aspects and features of various embodiments, which should be interpreted as merely illustrative of a potential application. Other beneficial results can be obtained by applying the disclosed information in different ways or by combining aspects of the disclosed embodiments. Other aspects and more comprehensive understandings can be obtained by referring to the specific description of exemplary embodiments in conjunction with the drawings, which are limited by the scope defined by the claims.

[0025] The above embodiments have been described in detail. Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or reductions, and replacements made by those skilled in the art within the spirit and scope of the present application also belong to the protection scope of the present application.

Claims

1. A flue of a biomass boiler, characterized in that The flue comprises a first flue surrounded by an inner membrane wall, a second flue surrounded by an outer membrane wall and the inner membrane wall, a third flue surrounded by the outer membrane wall and a partition, and a fourth flue surrounded by the partition and the outer wall plate; the first flue and the second flue are communicated through a first smoke passing hole at the bottom of the inner membrane wall, the second flue and the third flue are communicated through a second smoke passing hole at the top of the outer membrane wall, and the third flue and the fourth flue are communicated through a third smoke passing hole at the bottom of the partition; the top of the fourth flue, the top plate at the top of the inner membrane wall and the fixed plate at the top of the partition surround a heating space of the gas collecting pipe and the gas collecting bag, the first flue is connected with a burner through a flue gas passage, and the tail of the fourth flue is provided with a smoke exhaust hole.

2. The flue of a biomass boiler according to claim 1, characterized in that The sidewall of the first flue is provided with a flue gas passage fixed between the inner membrane wall and the outer membrane wall, the flue gas passage penetrates the second flue, the third flue and the fourth flue, and communicates the inner membrane wall with the outside, and the burner is fixed in the communication.

3. The flue of a biomass boiler according to claim 2, characterized in that The inner membrane wall and the outer membrane wall are both welded by water pipes and wall plates; the water pipes and the wall plates of the inner membrane wall and the water pipes of the outer membrane wall are communicated at the upper collecting pipe, and the wall plates of the outer membrane wall are not in contact with the upper collecting pipe, and the gap between the wall plates of the outer membrane wall and the upper collecting pipe is the second smoke passing hole; the water pipes and the wall plates of the outer membrane wall and the water pipes of the inner membrane wall are communicated at the lower collecting pipe, and the wall plates of the inner membrane wall are not in contact with the lower collecting pipe, and the gap between the wall plates of the inner membrane wall and the lower collecting pipe is the first smoke passing hole.

4. The flue of a biomass boiler according to claim 3, characterized in that The partition and the outer wall plate are rectangular or circular cylinders.

5. The flue gas duct of a biomass boiler according to any of claims 1 to 4, characterized in that The bottom of the first flue is provided with an ash filter plate at the position of the lower collecting pipe, for filtering the ash in the flue gas into the collecting box at the bottom.

6. A flue of a biomass boiler according to claim 5, characterized in that The bottom of the outer wall plate is provided with a bottom plate for surrounding the third flue and the fourth flue and bearing the third flue and the fourth flue; the bottom of the outer wall plate is provided with a cover plate, which is divided into a first cover plate and a second cover plate, and the first cover plate and the second cover plate close the lower part of the gas collecting bag and the gas collecting pipe in the heating space.

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