Air cap of circulating fluidized bed boiler

Abstract

The utility model belongs to the technical field of circulating fluidized beds, and relates to a wind cap of a circulating fluidized bed boiler, which comprises a wind cap shell and an inner core pipe, the inner core pipe comprises an air cap connecting section and a ventilation extending section, a positioning protrusion extending outwards is arranged on the air cap connecting section, one end of the ventilation extending section is communicated with an inner cavity of the boiler, and the other end of the ventilation extending section is connected with the air cap connecting section; the air cap shell is arranged on the periphery of the air cap connecting section in a sleeving mode, a ventilation cavity is formed between the air cap shell and the air cap connecting section, and a clamping groove matched with the positioning protrusion is formed in the air cap shell; according to the utility model, the positioning bulge is arranged on the wind cap connecting section, and the clamping groove matched with the positioning bulge is formed in the wind cap shell, so that the stable connection of the wind cap connecting section and the wind cap shell is realized, and the problems of falling off, skewing and the like of the wind cap shell are avoided under the conditions of long-term operation of a boiler or extreme working conditions such as larger airflow fluctuation and vibration; therefore, the operation stability and safety of the boiler are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of circulating fluidized bed, concretely relates to a circulating fluidized bed boiler wind cap. BACKGROUND

[0002] The circulating fluidized bed boiler wind cap, as an important device of the top of the circulating fluidized bed boiler, its core role is to provide the necessary air volume for the gas flow in the boiler, and is responsible for the emission of waste gas, and plays an important role in the operation of the circulating fluidized bed boiler. At present, the forms of the wind cap are various, including longitudinal flue type wind cap, air blower type wind cap, ejector type wind cap and new type of hemispherical wind cap.

[0003] The prior art has certain research on the circulating fluidized bed boiler wind cap, and the patent document with the application number of 201710148744.1 discloses an environmental protection and energy saving type bell jar type wind cap for circulating fluidized bed boiler, which comprises: a wind cap head, a protective sleeve and a wind cap seat, the wind cap seat comprises a cylinder and a supporting plate, the supporting plate is sleeved on the upper part of the cylinder, the protective sleeve comprises a barrel and a positioning ring fixed to the outer edge of the opening end of the barrel, a plurality of first through holes are uniformly arranged on the upper part of the side wall of the barrel, a plurality of second through holes are uniformly arranged on the top of the barrel, the wind cap head and the protective sleeve are all buckled on the supporting plate, wherein the wind cap head is fixedly connected with the supporting plate, and the protective sleeve is located between the wind cap head and the wind cap seat, wherein the outer side wall of the positioning ring and the top outer edge are in close contact with the inner wall of the wind cap head, and the wind cap head, the protective sleeve and the cylinder are coaxially arranged.

[0004] It can be known that the environmental protection and energy saving type bell jar type wind cap for circulating fluidized bed boiler containing the wind cap head, the protective sleeve and the wind cap seat is designed, the effective control of the gas flow in the boiler and the uniform emission of waste gas are realized, and the operation efficiency and the environmental protection performance of the boiler are improved. However, the positioning and support between the wind cap head and the cylinder are only realized by the close contact between the positioning ring of the protective sleeve and the inner wall of the wind cap head, the connection between the wind cap head and the cylinder is unstable, under the long-term operation of the boiler or under the extreme working conditions such as large airflow fluctuation and vibration, the wind cap is prone to falling off, tilting and other problems due to uneven stress, leading to poor gas flow and low waste gas emission efficiency, and even the operation failure of the boiler may be caused, thereby affecting the stability and safety of the overall system. UTILITY MODEL CONTENTS

[0005] In order to solve the technical problems that the connection between the wind cap head and the cylinder is unstable, the wind cap is prone to falling off, tilting and other problems, leading to poor gas flow and low waste gas emission efficiency in the background art, the utility model provides a circulating fluidized bed boiler wind cap.

[0006] The utility model discloses circulating fluidized bed boiler wind cap, set up the positioning protruding on the wind cap connecting section, set up the clamping groove of being suitable for the positioning protruding on the wind cap shell, realized the stable connection of wind cap connecting section and wind cap shell, under the long -term operation of boiler or the extreme working condition condition such as meeting larger airflow fluctuation, vibration, avoid the problem such as the falling off of wind cap shell, skew, thereby improve the stability and security of boiler operation.

[0007] To solve the above technical problem, the utility model provides the following technical scheme:

[0008] A circulating fluidized bed boiler wind cap, comprising: wind cap shell and inner core pipe, the inner core pipe includes wind cap connecting section and ventilation extension section, the wind cap connecting section is provided with the positioning protruding that extends outward to the one end close to the ventilation extension section, the ventilation extension section is communicated with the inner chamber of boiler to the one end, and the other end of the ventilation extension section is connected with the wind cap connecting section, the wind cap shell is set up on the outer periphery of wind cap connecting section, and the wind cap shell is formed with the ventilation cavity between the wind cap connecting section, and the wind cap shell is provided with the clamping groove of being suitable for the positioning protruding.

[0009] In a specific embodiment, the wind cap connecting section is also provided with a sealing block extending along the axial direction of the wind cap connecting section at the end close to the ventilation extension section, and the sealing block extends from the wind cap connecting section to the wind cap shell, and the sealing block is located below the positioning protruding.

[0010] In a specific embodiment, the wind cap connecting section is provided with a first air outlet at the end away from the boiler.

[0011] In a specific embodiment, a plurality of first air outlets are uniformly distributed along the circumference of the wind cap connecting section.

[0012] In a specific embodiment, the diameter of the first air outlet ranges from 10mm to 11.5mm.

[0013] In a specific embodiment, the wind cap shell is provided with a second air outlet, and the second air outlet is communicated with the ventilation cavity.

[0014] In a specific embodiment, a plurality of second air outlets are uniformly distributed along the circumference of the wind cap shell.

[0015] In a specific embodiment, the diameter of the second air outlet ranges from 8mm to 14mm.

[0016] In a specific embodiment, the wind cap connecting section, the sealing block and the positioning protruding are integrally formed.

[0017] In summary, the utility model has the following beneficial technical effects:

[0018] 1. The utility model discloses a circulating fluidized bed boiler wind cap, set up the positioning protruding on the wind cap connecting section, set up the clamping groove that is adapted with the positioning protruding on the wind cap shell, realize the stable connection of wind cap connecting section and wind cap shell, avoid the problem that wind cap shell appears to fall off, skew etc.

[0019] 2. The utility model discloses a circulating fluidized bed boiler wind cap, the one end of wind cap connecting section near ventilation extension section sets up sealing block, enhances the leakproofness between wind cap connecting section and wind cap shell, prevents the connection place of wind cap shell and wind cap connecting section from leaking air, improves primary air fluidization effect.

[0020] 3. The utility model discloses a circulating fluidized bed boiler wind cap, by setting up the first air outlet at the one end of wind cap connecting section away from the boiler, it is convenient to utilize the cooling effect of primary air, reduces the temperature of wind cap connecting section top and wind cap shell top, avoids appearing the problem that partial overburning leads to wind cap burning loss, thereby prolongs the service life of wind cap.

[0021] 4. The utility model discloses a circulating fluidized bed boiler wind cap, by setting up the second air outlet on wind cap shell, further increases ventilation volume, thereby improves the fluidization state in the furnace, especially suitable for coal feeder discharge port, return ash port and the four arounds of furnace etc. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is the partial structure schematic view of the utility model circulating fluidized bed boiler wind cap, and it is intended to show the inner core pipe.

[0023] Fig. 2 It is the partial structure schematic view of the utility model circulating fluidized bed boiler wind cap, and it is intended to show the wind cap shell.

[0024] Fig. 3 It is the sectional view of the utility model circulating fluidized bed boiler wind cap.

[0025] BRIEF DESCRIPTION OF DRAWINGS 1, wind cap shell;101, clamping groove;102, second air outlet;2, inner core pipe;201, wind cap connecting section;202, ventilation extension section;203, positioning protruding;204, sealing block;205, first air outlet;3, ventilation cavity. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be explained further below in combination with the drawings and examples, but the utility model is not limited to the following described embodiments.

[0027] Fluidized bed boiler fluidization is one of the important reasons for causing the boiler coking, if the fluidization wind speed is lower than the critical fluidization wind speed, the material burns and releases heat in the furnace, the heat is not transferred to the boiler heating surface in time, resulting in the temperature of the material rising sharply. When the temperature exceeds the ash melting point temperature of the ash, high temperature coking of the whole bed will occur, especially at the coal feeder outlet, the return material ash port and the poor fluidization around the furnace, a large number of coke blocks are accumulated.

[0028] The utility model aims at providing a circulating fluidized bed boiler wind cap, positioning protrusions are arranged on the wind cap connecting section, clamping grooves matched with the positioning protrusions are arranged on the wind cap shell, the stable connection of the wind cap connecting section and the wind cap shell is realized, under the condition of long-term operation of the boiler or encountering large airflow fluctuation, vibration and other extreme working conditions, the problems of falling off and skewing of the wind cap shell are avoided, thereby the stability and safety of the boiler operation are improved.

[0029] Embodiment 1

[0030] Reference Figs. 1-3 A circulating fluidized bed boiler wind cap, comprising: a wind cap shell 1 and an inner core pipe 2. The inner core pipe 2 comprises a wind cap connecting section 201 and a ventilation extension section 202, the wind cap connecting section 201 is provided with an outwardly extending positioning protrusion 203 close to one end of the ventilation extension section 202, one end of the ventilation extension section 202 is communicated with the inner cavity of the boiler, the other end of the ventilation extension section 202 is connected with the wind cap connecting section 201; the wind cap shell 1 is sleeved on the outer periphery of the wind cap connecting section 201, and a ventilation cavity 3 is formed between the wind cap shell 1 and the wind cap connecting section 201, the wind cap shell 1 is provided with a clamping groove 101 matched with the positioning protrusion 203, the stable connection of the wind cap shell 1 and the inner core pipe 2 is realized through the cooperation of the clamping groove 101 and the positioning protrusion 203. In the embodiment, the circulating fluidized bed boiler wind cap adopts a bamboo joint type wind cap shell 1, the inner cavity diameter of the top of the wind cap shell 1 is 69mm, and the outer diameter of the top of the wind cap shell 1 is 85mm.

[0031] Specifically, the opening direction of the clamping groove 101 can be designed as inclined or arc-shaped, which facilitates the smooth sliding of the positioning protrusion 203 during installation, and increases the firmness of the connection between the wind cap shell 1 and the wind cap connecting section 201.

[0032] The first air outlet 205 is arranged at the end of the wind cap connecting section 201 away from the boiler, which is used for reducing the temperature of the top of the wind cap connecting section 201 and the top of the wind cap shell 1 by using the cooling effect of the primary air, so as to avoid the problem of local overburning and wind cap burning.

[0033] Specifically, a plurality of first air outlets 205 are uniformly distributed along the circumference of the air cap connecting section 201, and a plurality of rows of first air outlets 205 are uniformly arranged along the axial direction of the air cap connecting section 201, so as to improve the uniformity of air distribution. In the embodiment, the number of first air outlets 205 along the circumference of the air cap connecting section 201 is not specifically limited, and a proper number of first air outlets 205 can be arranged according to the actual air distribution requirement in the circulating fluidized bed boiler, so as to achieve the best air distribution effect.

[0034] More specifically, the diameter of the first air outlet 205 ranges from 10 mm to 11.5 mm. In the embodiment, the diameter of the first air outlet 205 can be 10 mm, 10.7 mm or 11.5 mm, and a proper diameter of the first air outlet can be selected to effectively reduce the temperature at the top of the air cap connecting section and the top of the air cap shell; in the embodiment, the diameter of the first air outlet 205 is 10 mm.

[0035] The air cap shell 1 is provided with a second air outlet 102, the second air outlet 102 is in communication with the ventilation cavity 3, and the second air outlet 102 is arranged close to the ventilation extending section 202. The second air outlet 102 is used to increase the ventilation volume and further improve the fluidization state in the circulating fluidized bed boiler.

[0036] Specifically, a plurality of second air outlets 102 are uniformly distributed along the circumference of the air cap shell 1, so as to improve the uniformity and efficiency of air distribution. In the embodiment, the number of second air outlets 102 is not specifically limited, and a proper number of second air outlets 102 can be arranged according to the required ventilation volume of the circulating fluidized bed boiler, so as to further increase the ventilation volume and improve the fluidization state in the furnace.

[0037] More specifically, the diameter of the second air outlet 102 ranges from 8 mm to 14 mm. In the embodiment, the diameter of the second air outlet 102 can be 8 mm, 11 mm or 114 mm, and a proper diameter of the second air outlet 102 can be selected to improve the fluidization state in the furnace; in the embodiment, the diameter of the second air outlet 102 is 8 mm.

[0038] In the embodiment, the shape of the first air outlet 205 and the second air outlet 102 can be circular, oval or strip-shaped, so as to optimize the air distribution effect and reduce the air resistance; preferably, the air outlet is circular, which is convenient for more effectively dispersing the air flow and reducing local overheating.

[0039] Embodiment 2:

[0040] With reference to Fig. 1, the embodiment of the circulating fluidized bed boiler wind cap, on the basis of example 1, the sealing block 204 extending along the axial direction of the wind cap connecting section 201 is further provided close to one end of the ventilation extension section 202, and the sealing block 204 extends from the wind cap connecting section 201 to the wind cap shell 1 direction, the sealing block 204 is located below the positioning protrusion 203, for enhancing the sealing between the wind cap shell 1 and the wind cap connecting section 201, prevent the connection between the wind cap shell 1 and the wind cap connecting section 201 from leaking, improve the fluidization effect of primary air flow.

[0041] Specifically, the surface of the sealing block 204 is provided with a small wave shape or sawtooth structure to enhance the friction between the sealing block 204 and the wind cap shell 1, and further improve the sealing effect. The transition fillet is provided between the sealing block 204 and the wind cap connecting section 201 to reduce stress concentration and improve the durability of the structure.

[0042] Example 3:

[0043] Referring to Fig. 1 , the embodiment of the circulating fluidized bed boiler wind cap, on the basis of example 1, the sealing block 204 extending along the axial direction of the wind cap connecting section 201 is further provided close to one end of the ventilation extension section 202, and the sealing block 204 extends from the wind cap connecting section 201 to the wind cap shell 1 direction, the sealing block 204 is located below the positioning protrusion 203, for enhancing the sealing between the wind cap shell 1 and the wind cap connecting section 201, prevent the connection between the wind cap shell 1 and the wind cap connecting section 201 from leaking, improve the fluidization effect of primary air flow.

[0044] The working principle of the circulating fluidized bed boiler wind cap of the utility model is as follows: the fluidizing air is introduced into the inner cavity of the boiler through the ventilation extension section 202; the fluidizing air continues to flow in the inner cavity of the boiler and is distributed through the first air outlet 205 on the wind cap connecting section 201 and the second air outlet 102 on the wind cap shell 1; when the fluidizing air flows out of the first air outlet 205, the temperature of the top of the wind cap connecting section 201 and the top of the wind cap shell 1 is reduced; when the fluidizing air flows out of the second air outlet 102, the ventilation volume is increased and the fluidization state in the boiler is improved, and at the same time, the fluidizing air is uniformly distributed in the inner cavity of the boiler, thereby improving the ventilation efficiency of the boiler and reducing the phenomenon of poor fluidization.

[0045] The preferred embodiment of the utility model is not limited to the protection scope of the utility model, so that: any equivalent change made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A wind cap for a circulating fluidized bed boiler, characterized in that, include: Windproof cap outer shell (1) and inner core tube (2); The inner core tube (2) includes a wind cap connecting section (201) and a ventilation extension section (202). The wind cap connecting section (201) has an outwardly extending positioning protrusion (203) at one end near the ventilation extension section (202). One end of the ventilation extension section (202) is connected to the boiler inner cavity, and the other end of the ventilation extension section (202) is connected to the wind cap connecting section (201). The outer shell (1) of the hood is fitted around the outer periphery of the hood connecting section (201), and a ventilation cavity (3) is formed between the outer shell (1) of the hood and the hood connecting section (201). The outer shell (1) of the hood is provided with a slot (101) that matches the positioning protrusion (203).

2. The circulating fluidized bed boiler vent cap according to claim 1, characterized in that: The end of the hood connecting section (201) near the ventilation extension section (202) is also provided with a sealing block (204) extending axially along the hood connecting section (201), and the sealing block (204) extends from the hood connecting section (201) toward the hood shell (1), and the sealing block (204) is located below the positioning protrusion (203).

3. The circulating fluidized bed boiler vent cap according to claim 2, characterized in that: The wind cap connecting section (201) is provided with a first air outlet (205) at the end away from the boiler.

4. The circulating fluidized bed boiler vent cap according to claim 3, characterized in that: Multiple first air outlets (205) are evenly distributed circumferentially along the vent cap connecting section (201); Multiple rows of first air outlet holes (205) are uniformly arranged along the axial direction of the wind cap connecting section (201).

5. The circulating fluidized bed boiler vent cap according to claim 4, characterized in that: The diameter of the first air outlet (205) ranges from 10 mm to 11.5 mm.

6. The circulating fluidized bed boiler air cap according to any one of claims 1 to 5, characterized in that: The outer shell (1) of the hood is provided with a second air outlet (102), and the second air outlet (102) is connected to the ventilation cavity (3).

7. The circulating fluidized bed boiler vent cap according to claim 6, characterized in that: Multiple second air outlets (102) are evenly distributed along the circumference of the outer shell (1) of the wind cap.

8. The circulating fluidized bed boiler vent cap according to claim 7, characterized in that: The diameter of the second air outlet (102) ranges from 8 mm to 14 mm.

9. The circulating fluidized bed boiler vent cap according to claim 2, characterized in that: The wind cap connecting section (201), sealing block (204) and positioning protrusion (203) are integrally formed.

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