Flue gas guiding device of high-temperature bypass flue

Abstract

The utility model discloses a flue gas guiding device of a high-temperature bypass flue, which comprises a denitration system, an air preheater arranged below an outlet of the denitration system, and a dust remover system communicated with an outlet end of the air preheater, and further comprises a main flue unit, the bypass flue unit comprises a first flue gas guide pipe communicated with the drainage pipe, and a rotational flow cylinder which is arranged at an outlet of the first flue gas guide pipe and is used for preliminarily separating dust in the flue gas guided out by the first flue gas guide pipe from the flue gas; and the second flue gas guide pipe is arranged at the outlet of the rotational flow cylinder and is used for discharging the flue gas subjected to rotational flow in the rotational flow cylinder. The separated fine liquid drops and soot particles impact the inner wall of the cyclone cylinder and finally slide into the dust accumulation groove along the inner wall of the cyclone cylinder, so that the risk that the fine liquid drops mixed with the soot particles are accumulated in the second flue gas flow guide pipe, and the bypass flue is blocked by dust is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization, in particular to a flue gas guiding device for a high-temperature bypass flue. Background Art

[0002] The bypass flue of the high-temperature bypass evaporator leads out of the main air and smoke system from the outlet of the denitrification device to the flue section of the air preheater inlet, and returns to the main air and smoke system from the outlet of the air preheater to the flue section of the dust collector inlet. The zero-discharge process of desulfurization wastewater is designed according to the pretreatment + concentration reduction + crystallization solidification method, and generally extracts 0.5-3% of the standard flue gas volume; the zero-discharge process of desulfurization wastewater is designed according to the pretreatment + crystallization solidification method, and generally extracts 3-6% of the standard flue gas volume;

[0003] In the prior art, the flue gas temperature from the outlet of the denitrification device to the inlet of the air preheater is 320-420℃, and the fly ash content is high. The flue direction is that the flue gas flows vertically downward into the air preheater, and the outlet flue of the high-temperature bypass evaporator is welded together with the main flue. The bypass flue does not perform any special treatment on the flue gas diversion method. It only uses the high-temperature bypass system resistance to be less than the flue gas resistance of the main air and smoke system section, thereby diverting part of the flue gas to the high-temperature bypass evaporator.

[0004] However, after the desulfurization wastewater is atomized, the bypass flue has a smaller aperture than the main flue, and the bypass flue in the prior art does not perform any protective treatment against dust inhalation, resulting in a high fly ash content in the bypass flue gas, which affects the diffusion effect of fine droplets in the bypass, reduces the evaporation efficiency of fine droplets to a certain extent, and prolongs the drying time of the desulfurization wastewater. The fine droplets that are not evaporated in time carry the fly ash and fall on the ash accumulation plate at the bottom of the evaporator, and are adsorbed on the ash accumulation plate, causing the risk of ash blockage in the return smoke of the bypass flue.

[0005] The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art. Utility Model Content

[0006] The purpose of the utility model is to provide a flue gas diversion device for a high-temperature bypass flue, so as to solve the problem raised in the above-mentioned background technology that the prior art has not dealt with the diversion method of the bypass flue, resulting in the bypass flue with a smaller aperture being easily adsorbed on the ash accumulation plate by fine droplets that have not been dried in time, carrying fly ash, causing the risk of ash blockage in the return smoke of the bypass flue.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A flue gas guide device for a high-temperature bypass flue comprises a denitration system, an air preheater arranged below the outlet of the denitration system, and a dust collector system connected to the outlet end of the air preheater, and further comprises:

[0009] A main flue unit, comprising a drainage pipe provided between the desulfurization system and the air preheater for draining the ash;

[0010] The bypass flue unit includes a first smoke guide pipe connected to the drainage pipe, a cyclone provided at the outlet of the first smoke guide pipe for initially separating dust from the smoke guided out of the first smoke guide pipe, and a second smoke guide pipe provided at the outlet of the cyclone pipe for discharging the smoke after swirling in the cyclone pipe.

[0011] Furthermore, the interior of the drainage tube is provided with a smoke inlet hole section, a contraction hole section, a fine hole section, an expansion hole section, and a smoke outlet hole section from top to bottom. The inner diameter of the smoke outlet hole section gradually decreases when entering the fine hole section through the contraction hole section, and the inner diameter of the fine hole section gradually increases when entering the smoke outlet hole section through the expansion hole section, so as to accelerate the flow rate of smoke in the fine hole section.

[0012] Furthermore, the first smoke guide pipe is connected to one side of the drainage pipe and communicated with the fine hole section inside the drainage pipe, so as to guide the smoke in the fine hole section.

[0013] Furthermore, a swirl blade is installed at the upper end of the swirl tube;

[0014] The swirl blades are spiral-shaped;

[0015] The swirl blades extend from the upper end of the swirl tube to between the first smoke outlet and the second smoke inlet of the smoke guide tube, and are used to centrifuge the smoke particles discharged from the first smoke outlet into the swirl tube.

[0016] Furthermore, a dust accumulation groove is provided at the lower end of the cyclone tube for accommodating the soot particles separated from the flue gas after centrifugation;

[0017] The smoke inlet of the second smoke guide pipe is located at the upper end of the dust accumulation groove.

[0018] Furthermore, the inner diameter of the second smoke guide pipe is smaller than that of the first smoke guide pipe, and the inner diameter of the first smoke guide pipe is smaller than the inner diameter of the fine hole segment, so as to maintain the amount of smoke extracted from the fine hole segment by the first smoke guide pipe at -% of the amount of smoke flowing through the fine hole segment.

[0019] Furthermore, the main flue unit further includes:

[0020] A main flue pipe is provided at the outlet end of the air preheater, and the main flue pipe is connected to the smoke outlet section;

[0021] A combined flue pipe, one end of which is connected to the main flue pipe, and the other end of which is connected to the dust collector system;

[0022] The outlet end of the second smoke guide pipe is connected to the combined flue pipe.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. In the utility model, when the smoke with dust particles enters the fine hole section from the smoke inlet section through the contraction hole section, the aperture gradually decreases, so that the flow rate of the smoke gradually increases and reaches the fastest flow rate when passing through the fine hole section. At this time, according to the Venturi effect, the greater the flow rate, the smaller the pressure, that is, the first smoke guide pipe reduces the diversion of the smoke particles with a certain gravity in the fine hole section, so that most of the smoke particles entering the fine hole section enter the smoke outlet section through the expansion hole section, and only a small amount of smoke particles enter the cyclone tube through the first smoke guide pipe, so as to avoid the bypass flue with a smaller aperture from being quickly blocked.

[0025] 2. In the utility model, when the flue gas that has not been evaporated in time is introduced into the cyclone tube through the first flue gas guide tube through the spirally designed cyclone blades, the cyclone blades can send the flue gas in a cyclone state downward along the cyclone tube to the second flue gas guide tube. During the cyclone of the flue gas in the cyclone tube, fine droplets of the flue gas that have not been evaporated in time by the heat generated by the air preheater in the guide tube and the ash particles in the fine droplets are separated from the flue gas due to centrifugal force. The separated fine droplets and ash particles hit the inner wall of the cyclone tube and finally slide down along the inner wall of the cyclone tube into the dust accumulation groove, which effectively prevents the fine droplets mixed with ash particles from accumulating in the second flue gas guide tube and causing the risk of ash blockage in the bypass flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 It is a schematic diagram of the internal structure of the main flue unit and the bypass flue unit of the utility model;

[0028] Figure 3 For the utility model Figure 2 The enlarged view of point A in the middle;

[0029] Figure 4 For the utility model Figure 2 Enlarged view of point B in the middle.

[0030] Figure numerals: 100, denitrification system; 101, air preheater; 102, first bracket; 103, dust collector system; 104, second bracket; 105, third bracket; 1, main flue unit; 2, bypass flue unit; 11, drainage pipe; 12, main flue pipe; 13, converging flue pipe; 111, smoke inlet section; 112, contraction hole section; 113, fine hole section; 114, expansion hole section; 115, smoke outlet section; 21, first flue gas guide pipe; 22, swirl tube; 221, dust accumulation groove; 23, second flue gas guide pipe; 24, swirl blade. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See also Figure 1-4 , the utility model provides a technical solution:

[0033] A flue gas guide device for a high-temperature bypass flue comprises a denitration system 100, an air preheater 101 disposed below the outlet of the denitration system, and a dust collector system 103 connected to the outlet end of the air preheater 101, and further comprises:

[0034] The main flue unit 1 includes a drainage pipe 11 provided between the desulfurization system and the air preheater 101 for draining the ash;

[0035] The bypass flue unit 2 includes a first smoke guide pipe 21 connected to the drainage pipe 11, a cyclone 22 arranged at the outlet of the first smoke guide pipe 21 for initially separating dust from the smoke guided out of the first smoke guide pipe 21, and a second smoke guide pipe 23 arranged at the outlet of the cyclone tube 22 for discharging the smoke after swirling in the cyclone tube 22.

[0036] As an improvement, Figure 1-3 As shown, the interior of the drainage pipe 11 is provided with a smoke inlet hole section 111, a contraction hole section 112, a fine hole section 113, an expansion hole section 114, and a smoke outlet hole section 115 from top to bottom. The inner diameter of the smoke outlet hole section 115 gradually decreases when entering the fine hole section 113 through the contraction hole section 112, and the inner diameter of the fine hole section 113 gradually increases when entering the smoke outlet hole section 115 through the expansion hole section 114, so as to accelerate the flow rate of smoke in the fine hole section 113.

[0037] With such a design, in the process of the flue gas containing dust particles after denitrification by the denitrification system 100 entering the fine hole section 113 from the smoke inlet section 111 through the contraction hole section 112, the aperture gradually decreases, so that the flow rate of the flue gas gradually increases and reaches the fastest flow rate when passing through the fine hole section 113. At this time, according to the Venturi effect, the greater the flow rate, the smaller the pressure, that is, the first flue gas guide 21 reduces the diversion flow of the ash particles with a certain gravity in the fine hole section 113, so that most of the ash particles entering the fine hole section 113 enter the smoke outlet section 115 through the expansion hole section 114, and only a small amount of ash particles enter the cyclone tube 22 through the first flue gas guide 21, so as to avoid the bypass flue with a smaller aperture from being quickly blocked.

[0038] Further, such as Figure 2-4 As shown, the first smoke guide pipe 21 is connected to one side of the drainage pipe 11 and is connected to the fine hole section 113 inside the drainage pipe 11, and is used to guide the smoke in the fine hole section 113;

[0039] A first bracket 102 for supporting the drainage tube 11 is disposed outside the drainage tube 11 .

[0040] As an improvement, a swirl blade 24 is installed at the upper end of the swirl cylinder 22;

[0041] The swirl blade 24 is spiral-shaped;

[0042] The swirl blade 24 extends from the upper end of the swirl tube 22 to a position between the smoke outlet of the first smoke guide pipe 21 and the smoke inlet of the second smoke guide pipe 23, and is used to centrifuge the smoke particles discharged from the first smoke outlet into the swirl tube 22;

[0043] A second bracket 104 for supporting the cyclone cylinder 22 is disposed outside the cyclone cylinder 22 .

[0044] Furthermore, a dust accumulation groove 221 is provided at the lower end of the cyclone 22 for accommodating the soot particles separated from the flue gas after centrifugation;

[0045] The smoke inlet of the second smoke guide pipe 23 is located at the upper end of the dust accumulation groove 221 .

[0046] Furthermore, the inner diameter of the second smoke guide tube 23 is smaller than the inner diameter of the first smoke guide tube 21, and the inner diameter of the first smoke guide tube 21 is smaller than the inner diameter of the fine hole section 113, so as to maintain that the amount of smoke extracted from the fine hole section 113 by the first smoke guide tube 21 accounts for 3-6% of the amount of smoke flowing through the fine hole section 113.

[0047] With such a design, the flue gas that is not evaporated in time after being introduced into the cyclone tube 22 through the first flue gas guide duct 21 can be sent downward along the cyclone tube 22 to the second flue gas guide duct 23 in a cyclone state when passing through the spirally designed cyclone blades 24. During the cyclone flow of the flue gas in the cyclone tube 22, the fine droplets of the flue gas that are not evaporated in time by the heat generated by the air preheater 101 in the guide tube 11 and the ash particles in the fine droplets are separated from the flue gas due to the centrifugal force. The separated fine droplets and ash particles hit the inner wall of the cyclone tube 22 and finally slide down along the inner wall of the cyclone tube 22 into the dust accumulation groove 221, thereby effectively preventing the fine droplets mixed with ash particles from accumulating in the second flue gas guide duct 23 and causing the risk of ash blockage in the bypass flue.

[0048] Among them, Figure 1-2 As shown, the main flue unit 1 also includes:

[0049] A main flue pipe 12 is provided at the outlet end of the air preheater 101, and the main flue pipe 12 is connected to the smoke outlet section 115;

[0050] A combined flue pipe 13, one end of which is connected to the main flue pipe 12, and the other end of which is connected to the dust collector system 103;

[0051] The outlet end of the second smoke guide pipe 23 is connected to the combined flue pipe 13;

[0052] A third bracket 105 for supporting the combined flue pipe 13 is disposed outside the combined flue pipe 13 .

[0053] With this design, the flue gas in the smoke outlet section 115 enters the merged flue pipe 13 through the main flue pipe 12, and the flue gas after centrifugal separation in the cyclone tube 22 enters the merged flue pipe 13 through the second flue gas guide pipe 23, and the flue gas in the merged flue pipe 13 flows into the dust collector system 103 for subsequent dust removal treatment.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flue gas guide device for a high-temperature bypass flue, comprising a denitration system (100), an air preheater (101) arranged below the outlet of the denitration system, and a dust collector system (103) connected to the outlet end of the air preheater (101), characterized in that: Also includes: A main flue unit (1) comprises a drainage pipe (11) provided between the desulfurization system and the air preheater (101) for draining the ash; The bypass flue unit (2) comprises a first smoke guide pipe (21) connected to the drainage pipe (11), a cyclone (22) provided at the outlet of the first smoke guide pipe (21) for initially separating dust from smoke guided out of the first smoke guide pipe (21), and a second smoke guide pipe (23) provided at the outlet of the cyclone (22) for discharging smoke after cyclone flow in the cyclone (22).

2. The flue gas guide device for a high-temperature bypass flue according to claim 1, characterized in that: The drainage pipe (11) is provided with a smoke inlet section (111), a contraction section (112), a fine hole section (113), an expansion section (114), and a smoke outlet section (115) in sequence from top to bottom. The inner diameter of the smoke outlet section (115) gradually decreases when entering the fine hole section (113) through the contraction section (112), and the inner diameter of the fine hole section (113) gradually increases when entering the smoke outlet section (115) through the expansion section (114), so as to accelerate the flow rate of smoke in the fine hole section (113).

3. The flue gas guide device for a high-temperature bypass flue according to claim 2, characterized in that: The first smoke guide pipe (21) is connected to one side of the drainage pipe (11) and communicates with the fine hole section (113) inside the drainage pipe (11), and is used to guide the smoke in the fine hole section (113).

4. The flue gas guide device for a high-temperature bypass flue according to claim 1, characterized in that: A swirl blade (24) is installed at the upper end of the swirl cylinder (22); The swirl blade (24) is spiral-shaped; The swirl blade (24) extends from the upper end of the interior of the swirl barrel (22) to a position between the smoke outlet of the first smoke guide pipe (21) and the smoke inlet of the second smoke guide pipe (23), and is used to centrifuge smoke particles discharged from the first smoke outlet into the swirl barrel (22).

5. The flue gas guide device for a high-temperature bypass flue according to claim 4, characterized in that: The lower end of the cyclone cylinder (22) is provided with a dust accumulation groove (221) for accommodating the soot particles separated from the smoke after centrifugation; The smoke inlet of the second smoke guide pipe (23) is located at the upper end of the dust accumulation groove (221).

6. The flue gas guide device for a high-temperature bypass flue according to claim 2, characterized in that: The inner diameter of the second smoke guide pipe (23) is smaller than the inner diameter of the first smoke guide pipe (21), and the inner diameter of the first smoke guide pipe (21) is smaller than the inner diameter of the fine hole section (113), so as to maintain that the amount of smoke extracted from the fine hole section (113) by the first smoke guide pipe (21) accounts for 3-6% of the amount of smoke flowing through the fine hole section (113).

7. The flue gas guide device for a high-temperature bypass flue according to claim 2, characterized in that: The main flue unit (1) further comprises: A main flue pipe (12) is arranged at the outlet end of the air preheater (101), and the main flue pipe (12) is connected to the smoke outlet section (115); A combined flue pipe (13), one end of which is connected to the main flue pipe (12) and the other end of which is connected to the dust collector system (103); The outlet end of the second smoke guide pipe (23) is connected to the combined flue pipe (13).

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