Chimney capable of preventing flue gas from washing downwards

Abstract

The utility model discloses a chimney capable of preventing smoke from washing downwards, which comprises a chimney body, and a flow guide mechanism used for guiding smoke to spirally rise upwards is mounted on the outer wall of the top of the chimney body. The flow guide mechanism comprises a plurality of arc-shaped flow guide plates distributed in the circumferential direction of the chimney body, the arc-shaped flow guide plates are vertically arranged, annular channels are formed between the arc-shaped flow guide plates and the outer wall of the chimney body, windward airflow inlets communicated with the annular channels are formed between the adjacent arc-shaped flow guide plates, and the arc-shaped flow guide plates are fixed to the outer wall of the chimney body through connecting supports. Through the arrangement of the arc-shaped flow guide plate, wind enters the annular channel from the windward airflow inlet and forms swirling airflow under the obstruction of the outer wall of the chimney body, so that flue gas exhausted from the top of the chimney body is driven to lift upwards, and the flue gas is prevented from washing downwards along the outer wall of the chimney body.

Description

Technical Field

[0001] The utility model relates to a chimney structure, in particular to a chimney for preventing flue gas from washing downwards. Background Art

[0002] As an exhaust device for industrial production, the chimney is an essential part of the normal production process and should be suitable for perennial use; the components of industrial flue gas are complex. With the improvement of environmental protection requirements, the desulfurization and denitrification processes have been gradually adopted on a large scale. However, with the current technological level, there are still acidic corrosive substances, and the humidity of the flue gas is very high after the generally adopted wet desulfurization. When the complex-component flue gas is discharged from the chimney 1, there is generally a phenomenon that the flue gas Y is affected by the high-speed crosswise airflow at high altitude (i.e., the wind Z) and is washed down at the top of the chimney, that is, a flue gas washing-down corrosion area X is formed on the leeward side of the top of the chimney 1, as Figure 1 shown. The height range of this kind of washing-down is generally at least several meters and at most more than ten meters, causing corrosion to a relatively large area of the outer wall of the chimney.

[0003] This phenomenon can often be seen in our daily life. After the flue gas is washed down, it will cause the surface to be dirty and unsightly at least, or damage the platform and its attached equipment, and may even cause corrosion and leakage of the top platform and the outer wall of the chimney, especially for steel chimneys. It not only consumes a large amount of labor for regular maintenance, bringing more risks of working at heights, but also once leakage or accidents occur, the losses are inestimable. As an essential chimney for continuous production, its corrosion and maintenance have always been difficult problems in the industry.

[0004] The traditional method is generally to add a section of stainless steel cover at the top to slow down the corrosion. This method has three disadvantages: one is that it increases the cost; the second is that due to the high cost, the increased height is generally limited and cannot completely cover the top washing-down corrosion area; the third is that after problems occur, the maintenance is difficult and safety problems are likely to occur. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a chimney with reasonable design, simple structure and effective in preventing flue gas from washing downwards in view of the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A chimney for preventing flue gas from washing downwards is characterized in that it includes a chimney body, and a guiding mechanism for guiding the flue gas to rise upwards to avoid the flue gas from washing downwards is installed on the outer wall of the top of the chimney body;

[0008] The flow guiding mechanism includes a number of vertically arranged arc-shaped flow guiding plates. The arc-shaped flow guiding plates are arranged in a circle along the circumference of the chimney body. An annular channel is provided between the arc-shaped flow guiding plates and the outer wall of the chimney body. An oncoming air flow inlet communicating with the annular channel is provided between adjacent arc-shaped flow guiding plates. The arc-shaped flow guiding plates are fixed on the outer wall of the chimney body through connecting supports. The wind enters the annular channel from the oncoming air flow inlet and forms a swirling ascending air flow under the obstruction of the outer wall of the chimney body, thereby driving the flue gas discharged from the top of the chimney body to rise upward and preventing the flue gas from flowing down along the outer wall of the chimney body.

[0009] The technical problem to be solved by the present utility model can also be achieved through the following technical solution. An inspection platform for supporting the arc-shaped flow guiding plates is provided on the outer wall of the chimney body. The arc-shaped flow guiding plates are fixed on the inspection platform along the circumference of the chimney body. Platform guardrail vertical supports are fixed on the top surface of the inspection platform, and platform guardrails are fixed at the upper ends of the platform guardrail vertical supports.

[0010] The technical problem to be solved by the present utility model can also be achieved through the following technical solution. Transverse reinforcing ribs are fixed between the arc-shaped flow guiding plates and the connecting supports, and between the arc-shaped flow guiding plates and the outer wall of the chimney body.

[0011] The technical problem to be solved by the present utility model can also be achieved through the following technical solution. The spacing between adjacent arc-shaped flow guiding plates is equal.

[0012] The technical problem to be solved by the present utility model can also be achieved through the following technical solution. The arc of the arc-shaped flow guiding plate is consistent with the arc of the outer wall of the chimney body.

[0013] Compared with the prior art, the present utility model is provided with a number of arc-shaped flow guiding plates on the outer wall of the chimney body. An annular channel is provided between the arc-shaped flow guiding plates and the outer wall of the chimney body. An oncoming air flow inlet communicating with the annular channel is provided between adjacent arc-shaped flow guiding plates, so that after the wind enters the annular channel, a swirling ascending air flow is formed along the outer wall of the chimney body, thereby preventing the flue gas discharged from the chimney body from rising upward and avoiding the phenomenon of downwash of the flue gas at the top of the chimney under the influence of the horizontal high-altitude high-speed air flow. The chimney structure for preventing flue gas downwash of the present utility model is simple, has a low manufacturing cost, can be flexibly set according to the height of the chimney, is easy to maintain, and has good safety. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the downwash of the flue gas outlet of the current chimney affected by the air flow;

[0015] Figure 2 It is an elevation view of the chimney for preventing flue gas downwash of the present utility model;

[0016] Figure 3 For Figure 2 the A-A sectional view in

[0017] Figure 4 For Figure 2 The enlarged schematic diagram at position B in

[0018] In the figure: 1 - chimney body; 2 - main beam diagonal brace; 3 - maintenance platform; 4 - vertical brace of platform guardrail; 5 - platform guardrail; 6 - connecting support; 7 - arc-shaped deflector; 8 - annular passage; 9 - windward air inlet, 10 - chimney outer wall, 11 - chimney lining, 12 - transverse stiffener. Specific implementation manners

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0021] Refer to Figure 2-4 , a chimney for preventing flue gas from washing down, including a chimney body 1, and a diversion mechanism for guiding the flue gas to rise upward to avoid the flue gas from washing down is installed on the outer wall of the top of the chimney body 1. The chimney body 1 is provided with a chimney outer wall 10 and a chimney lining 11;

[0022] The diversion mechanism includes a plurality of vertically arranged arc-shaped deflectors 7. The arc-shaped deflectors 7 are arranged in a circle along the circumferential direction of the chimney body 1. An annular passage 8 is provided between the arc-shaped deflectors 7 and the outer wall of the chimney body 1. An air inlet 9 communicating with the annular passage 8 is provided between adjacent arc-shaped deflectors 7. The arc-shaped deflectors 7 are fixed on the outer wall of the chimney body 1 through a connecting support 6; the wind enters the annular passage 8 from the air inlet, and a swirling airflow is formed under the obstruction of the outer wall of the chimney body 1, so as to drive the flue gas discharged from the top of the chimney body 1 to rise upward, avoiding the flue gas from washing down along the outer wall of the chimney body.

[0023] A maintenance platform 3 for supporting the arc-shaped deflectors is provided on the outer wall of the chimney body 1. The arc-shaped deflectors 7 are fixed on the maintenance platform 3 along the circumferential direction of the chimney body. A vertical brace 4 of the platform guardrail is fixed on the top surface of the maintenance platform 3, and a platform guardrail 5 is fixed at the upper end of the vertical brace 4 of the platform guardrail, which is convenient for the installation and maintenance of the arc-shaped deflectors.

[0024] A transverse reinforcing rib 10 is fixed between the arc-shaped deflector 7 and the connecting support 6, and between the arc-shaped deflector 7 and the outer wall of the chimney body 1 to strengthen the installation stability of the arc-shaped deflector 7 and prevent it from tilting in strong winds.

[0025] The spacing between adjacent arc-shaped deflectors is equal, that is, the interval gap between any two adjacent arc-shaped deflectors 7 is the same, so as to ensure that the wind from all directions can enter the annular channel 8.

[0026] The arc of the arc-shaped deflector 7 is consistent with the arc of the outer wall 10 of the chimney body 1, that is, one side is a convex surface and the other side is a concave surface; the concave surface of the arc-shaped deflector 7 faces the outer wall of the chimney, and the convex surface of the arc-shaped deflector 7 faces away from the outer wall 10 of the chimney to ensure the swirling-up effect.

[0027] The working principle of the chimney of the present utility model is as follows:

[0028] When the high-altitude air flow enters from the gap between the arc-shaped deflectors 7 (i.e., the windward air flow inlet 9), under the combined action of the chimney body 1, the annular surface and the external wind pressure, most of the air flow will flow along the annular channel between the two towards the leeward side; under the action of the inner arc surface of the arc-shaped deflector 7 on the leeward side, part of the air flow will naturally swirl upward and be discharged (discharged from the air flow swirling-up outlet 8).

[0029] Generally, a gas flow direction is formed in which the gas enters from the gap along the convex surface of the arc-shaped deflector 7 on the windward side and swirls upward under the action of the concave arc of the arc-shaped deflector 7 on the leeward side. The lift force formed by this air flow naturally overcomes most of the flue gas downwash effect on the leeward side.

[0030] Although the chimney of the present utility model cannot completely avoid flue gas downwash, experiments show that the downwash height can be reduced to less than one meter, and the degree of downwash is significantly reduced; the downwash range is only a few tenths of the original, and the effect is obvious.

[0031] If the corrosiveness of the flue gas components is relatively low, only using the structure of the present utility model can meet the requirements of a long service life; compared with the conventional method of setting a stainless steel cover at the top, the structure of the present utility model can greatly ensure the service life of the product. Moreover, the structure of the present utility model is installed on the top platform, with a simple structure, low cost, and easy maintenance.

[0032] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A chimney for preventing flue gas downwash, characterized in that: The chimney comprises a chimney body, on the outer wall of the top of the chimney body, a guide mechanism for guiding the smoke to spiral upward and avoid the smoke from washing downward is installed; The guide mechanism includes a plurality of vertically arranged arc guide plates, wherein the arc guide plates are arranged in a circle along the circumference of the chimney body, an annular channel is arranged between the arc guide plates and the outer wall of the chimney body, and a windward airflow inlet communicating with the annular channel is arranged between adjacent arc guide plates, and the arc guide plates are fixed to the outer wall of the chimney body through connecting supports; wind enters the annular channel from the windward airflow inlet, and forms a swirling airflow under the obstruction of the outer wall of the chimney body, thereby driving the smoke discharged from the top of the chimney body to rise upward, and preventing the smoke from washing down along the outer wall of the chimney body.

2. A chimney for preventing flue gas downwash according to claim 1, characterized in that: An inspection platform for supporting the arc guide plate is provided on the outer wall of the chimney body. The arc guide plate is fixed on the inspection platform along the circumference of the chimney body. A platform guardrail support is fixed on the top surface of the inspection platform. A platform guardrail is fixed on the upper end of the platform guardrail support.

3. A chimney for preventing flue gas downwash according to claim 1, characterized in that: Transverse reinforcing ribs are fixed between the arc-shaped guide plate and the connecting support, and between the arc-shaped guide plate and the outer wall of the chimney body.

4. A chimney for preventing flue gas downwash according to claim 1, characterized in that: The spacing between adjacent arc-shaped guide plates is equal.

5. A chimney for preventing flue gas downwash according to claim 1, characterized in that: The arc shape of the arc guide plate is consistent with the arc shape of the outer wall of the chimney body.

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