A gas pressure sealing mechanism for a desulfurization tower

Abstract

The present application relates to a kind of gas pressure sealing mechanism for desulfurization tower, including stirring shaft, stirring shaft can pass through the lateral wall of desulfurization tower, also including flange and gas seal piece.Flange is sleeved on the outer periphery of stirring shaft, flange and stirring shaft clearance fit, and flange can be fixedly connected with the outside wall of desulfurization tower, stirring shaft rotates relative to flange.Gas seal piece is circular ring body, gas seal piece is sleeved on the outer periphery of stirring shaft, gas seal piece and stirring shaft clearance fit, and gas seal piece is fixedly connected with flange.Gas supply channel is set on gas seal piece, gas supply channel can be sequentially into high-pressure gas in the gap between gas seal piece and stirring shaft, the gap between flange and stirring shaft and the gap between stirring shaft and the lateral wall of desulfurization tower.Its beneficial effect is that, between gas seal piece and stirring shaft, between flange and stirring shaft and between stirring shaft and the lateral wall of desulfurization tower are all clearance fit, avoid component mutual friction loss, long service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desulfurization tower sealing, in particular to a kind of gas pressure sealing mechanism for desulfurization tower. BACKGROUND

[0002] Desulfurization tower is a kind of industrial desulfurization device, alkaline liquid (such as lime water) is sprayed to polluted gas in desulfurization tower, and the alkaline liquid can absorb sulfur-containing gas, and form slurry at the bottom of desulfurization tower, the slurry contains very high acidity and contains a large amount of particulate matter, therefore, the slurry needs to be continuously stirred to avoid the particulate matter in the slurry from depositing and caking.

[0003] Due to the high height of the desulfurization tower, the side-entering stirring shaft is generally arranged on the side wall of the desulfurization tower, and the stirring shaft is inserted into the desulfurization tower to stir the slurry. Since the stirring shaft and the side wall of the desulfurization tower have a gap, the slurry of the alkaline liquid or the corrosive gas generated by the slurry is easy to overflow from the gap to the outside. In order to prevent the slurry in the desulfurization tower and the corrosive gas from overflowing between the stirring shaft and the side wall of the desulfurization tower, the stirring shaft and the side wall of the desulfurization tower are connected by a sealing structure, and the gap between the stirring shaft and the side wall of the desulfurization tower is sealed by the sealing structure.

[0004] However, the existing sealing structure generally includes a movable ring and a static ring, the movable ring and the static ring are arranged opposite to each other, one end of the static ring is provided with an elastic member for pressing the static ring against the movable ring, so that the static ring and the movable ring are in contact to seal the gap between the stirring shaft and the side wall of the desulfurization tower. However, after long-term use of the sealing structure, the contact surface of the movable ring and the static ring is easy to wear due to extrusion, and the spring assembly is also easy to damage, resulting in sealing failure of the dynamic sealing structure, and further causing the slurry in the desulfurization tower and the corrosive gas to leak from the side-entering stirrer, which has poor sealing effect. SUMMARY

[0005] (I) Technical problem to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides a kind of gas pressure sealing mechanism for desulfurization tower stirrer, which solves the technical problem that the sealing structure for sealing the gap between the stirring shaft and the side wall of the desulfurization tower in the prior art is easy to damage after long-term use, resulting in sealing failure of the sealing structure.

[0007] (II) Technical scheme

[0008] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present application includes:

[0009] The present application provides a kind of gas pressure sealing mechanism for desulfurization tower, including stirring shaft, the stirring shaft can pass through the side wall of desulfurization tower, its characterized in that further includes:

[0010] A flange is sleeved on the outer periphery of the stirring shaft, the flange and the stirring shaft are in clearance fit, and the flange can be fixedly connected to the outer side wall of the desulfurization tower, and the stirring shaft rotates relative to the flange;

[0011] A gas supply seal is a circular ring body, the gas supply seal is sleeved on the outer periphery of the stirring shaft, the gas supply seal and the stirring shaft are in clearance fit, and the gas supply seal is fixedly connected to the flange;

[0012] A gas supply passage is arranged on the gas supply seal, and the gas supply passage can sequentially introduce high-pressure gas into the clearance between the gas supply seal and the stirring shaft, the clearance between the flange and the stirring shaft, and the clearance between the stirring shaft and the side wall of the desulfurization tower.

[0013] According to the present application, the gas supply passage comprises a gas supply hole, a first gas supply annular cavity and a second gas supply annular cavity, which are sequentially and continuously arranged from the outside to the inside along the radial direction of the gas supply seal;

[0014] The first gas supply annular cavity is a circular ring type, and the longitudinal section of the second gas supply annular cavity is a trapezoidal type, and the second gas supply annular cavity communicates with the clearance between the gas supply seal and the stirring shaft.

[0015] According to the present application, the clearance between the gas supply passage, the middle part of the gas supply seal and the stirring shaft, and the clearance between the flange and the stirring shaft form a first gas inlet passage;

[0016] The clearance between the gas supply seal and the stirring shaft away from the desulfurization tower, the clearance between the middle part of the gas supply seal and the stirring shaft, and the clearance between the flange and the stirring shaft form a second gas inlet passage.

[0017] According to the present application, the upper base angle of the longitudinal section of the second gas supply annular cavity is 93-135°.

[0018] According to the present application, a tapered ring groove is arranged on the inner peripheral side wall of the flange, and the tapered ring groove extends to the end face of the flange away from the gas supply seal;

[0019] The first end of the stirring shaft extends outward along the radial direction to form a tapered ring body, the tapered ring body is adapted to the tapered ring groove and is in clearance fit;

[0020] When the stirring shaft moves along the axial direction, the tapered ring body can abut against the tapered ring groove.

[0021] According to the present application, a thread is arranged on the circumferential side wall of the end of the stirring shaft away from the desulfurization tower;

[0022] When the stirring shaft rotates around its own axis, the slurry in the thread can be driven to flow from the end of the stirring shaft away from the desulfurization tower to the end of the stirring shaft close to the desulfurization tower.

[0023] According to the present application, the rotation direction of the thread is opposite to the rotation direction of the stirring shaft.

[0024] According to the present application, a bearing seat is further included, which can be arranged on the desulfurization tower.

[0025] The end of the stirring shaft close to the desulfurization tower is connected through a bearing and the bearing seat.

[0026] The flange is connected with the bearing seat.

[0027] (III) Beneficial effects

[0028] The beneficial effects of the present application are as follows: the desulfurization tower gas pressure sealing mechanism of the present application can pass through the side wall of the desulfurization tower. The flange is arranged on the stirring shaft, and the flange and the stirring shaft are in clearance fit, and the flange can be fixedly connected to the outer side wall of the desulfurization tower. The gas supply sealing element is a circular ring body, the gas supply sealing element is arranged on the stirring shaft, the gas supply sealing element and the stirring shaft are in clearance fit, and the gas supply sealing element is fixedly connected to the flange. The gas supply sealing element is provided with a gas supply channel, which can sequentially introduce high-pressure gas into the gaps between the gas supply sealing element and the stirring shaft, the gaps between the flange and the stirring shaft, and the gaps between the stirring shaft and the side wall of the desulfurization tower. The gaps between the gas supply sealing element and the stirring shaft, the gaps between the flange and the stirring shaft, and the gaps between the stirring shaft and the side wall of the desulfurization tower are sealed by high-pressure gas, which prevents the slurry and corrosive gas in the desulfurization tower from overflowing through the gaps between the stirring shaft and the side wall of the desulfurization tower. At the same time, the gaps between the gas supply sealing element and the stirring shaft, the gaps between the flange and the stirring shaft, and the gaps between the stirring shaft and the side wall of the desulfurization tower are in clearance fit, which avoids mutual friction and wear between the components, and prolongs the service life of the desulfurization tower gas pressure sealing mechanism.

[0029] At the same time, in order to shorten the chemical reaction efficiency of the slurry, the desulfurization tower in the prior art needs to be separately provided with an air inlet mechanism to introduce air into the desulfurization tower. The present application can discharge high-pressure gas from the gaps between the stirring shaft and the side wall of the desulfurization tower into the desulfurization tower, so it is not necessary to separately provide an air inlet mechanism, thereby simplifying the structure. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The assembly drawing of the desulfurization tower gas pressure sealing mechanism of the present application;

[0031] Figure 2 The exploded view of Figure 1

[0032] Figure 3 The exploded view of​Figure 1 A cross-sectional view (arrows point in the direction of high-pressure gas or air flow);

[0033] Figure 4 This is a sectional view of the flange;

[0034] Figure 5 This is a cross-sectional view of the stirring shaft;

[0035] Figure 6 This is a cross-sectional view of the air supply seal.

[0036] [Explanation of Labels in the Attached Image]

[0037] 1: Stirring shaft; 11: Conical ring; 12: Thread;

[0038] 2: Flange; 21: Conical annular groove; 22: Annular groove;

[0039] 3: Air supply seal; 31: Air supply channel; 311: Air supply hole; 312: First air supply annular cavity; 313: Second air supply annular cavity. Detailed Implementation

[0040] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] See Figures 1-6 The present invention provides a pneumatic sealing mechanism for a desulfurization tower, which includes a stirring shaft 1 that can pass through the side wall of the desulfurization tower, and also includes a flange 2 and a gas supply sealing element 3.

[0042] Flange 2 is fitted around the outer periphery of the agitator shaft 1, with a clearance fit between flange 2 and agitator shaft 1. Flange 2 is also fixedly connected to the outer wall of the desulfurization tower, and agitator shaft 1 rotates relative to flange 2. Gas supply seal 3 is an annular body fitted around the outer periphery of the agitator shaft 1, with a clearance fit between gas supply seal 3 and agitator shaft 1, and fixedly connected to flange 2. Gas supply seal 3 has a gas supply channel 31, which sequentially supplies high-pressure gas into the gaps between gas supply seal 3 and agitator shaft 1, between flange 2 and agitator shaft 1, and between agitator shaft 1 and the side wall of the desulfurization tower. This high-pressure gas seals the gaps between gas supply seal 3 and agitator shaft 1, between flange 2 and agitator shaft 1, and between agitator shaft 1 and the side wall of the desulfurization tower, preventing slurry and corrosive gases from overflowing from the gap between agitator shaft 1 and the side wall of the desulfurization tower. Meanwhile, there is a clearance fit between the gas supply seal 3 and the stirring shaft 1, between the flange 2 and the stirring shaft 1, and between the stirring shaft 1 and the side wall of the desulfurization tower, which avoids mutual friction and wear between the components and extends the service life of the gas pressure sealing mechanism for this desulfurization tower.

[0043] Meanwhile, in order to shorten the chemical reaction efficiency of the slurry, the desulfurization tower in the prior art needs to be separately provided with an air inlet mechanism, and air is introduced into the desulfurization tower by the air inlet mechanism. The present application can discharge high-pressure gas into the desulfurization tower through the gap between the stirring shaft 1 and the side wall of the desulfurization tower, so it is not necessary to separately provide an air inlet mechanism, thereby simplifying the structure.

[0044] Further, the gas supply channel 31 comprises a gas supply hole 311, a first gas supply annular cavity 312 and a second gas supply annular cavity 313. The gas supply hole 311, the first gas supply annular cavity 312 and the second gas supply annular cavity 313 are sequentially and continuously arranged along the radial direction of the gas supply sealing piece 3 from outside to inside.

[0045] The first gas supply annular cavity 312 is in the shape of a circular ring, and the longitudinal section of the second gas supply annular cavity 313 is in the shape of a ladder. The second gas supply annular cavity 313 communicates the gap between the gas supply sealing piece 3 and the stirring shaft 1.

[0046] Specifically, the gap between the gas supply channel 31, the middle part of the gas supply sealing piece 3 and the stirring shaft 1, the gap between the flange 2 and the stirring shaft 1 form the first air inlet channel. The gap between the gas supply sealing piece 3 and the stirring shaft 1 away from the desulfurization tower, the gap between the middle part of the gas supply sealing piece 3 and the stirring shaft 1 and the gap between the flange 2 and the stirring shaft 1 form the second air inlet channel.

[0047] The working principle of the first air inlet channel is that the high-pressure gas introduced into the gas supply hole 311 sequentially enters the second gas supply annular cavity 313 through the first gas supply annular cavity 312. After the high-pressure gas rapidly enters the second gas supply annular cavity 313, it is inclined downward along the second gas supply annular cavity 313 due to inertia and enters the gap between the middle part of the gas supply sealing piece 3 and the stirring shaft 1, and then enters the gap between the flange 2 and the stirring shaft 1, so that the high-pressure gas flows in one direction, reducing the reverse flow of the high-pressure gas and the overflow of the high-pressure gas through the gap between the gas supply sealing piece 3 and the stirring shaft 1 away from the desulfurization tower.

[0048] The working principle of the second air inlet channel is that after the high-pressure gas rapidly enters the second gas supply annular cavity 313, it is inclined downward along the second gas supply annular cavity 313 due to inertia and enters the gap between the middle part of the gas supply sealing piece 3 and the stirring shaft 1. Then, the high-pressure gas can drive the air in the gap between the gas supply sealing piece 3 and the stirring shaft 1 to enter the gap between the flange 2 and the stirring shaft 1, and a negative pressure environment is formed between the gas supply sealing piece 3 and the stirring shaft 1 away from the desulfurization tower. Under the action of the negative pressure environment, external air is driven to enter the gap between the gas supply sealing piece 3 and the stirring shaft 1 away from the desulfurization tower, and then sequentially enters the gap between the flange 2 and the stirring shaft 1 through the gap between the middle part of the gas supply sealing piece 3 and the stirring shaft 1.

[0049] Further, the upper base angle of the longitudinal section of the second gas supply annular cavity 313 is 93-135°, so that the high-pressure gas quickly enters the second gas supply annular cavity 313 and then enters the gap between the gas supply seal 3 and the middle part of the stirring shaft 1 due to inertia.

[0050] Preferably, the gap between the gas supply seal 3 and the end of the stirring shaft 1 away from the desulfurization tower is 0.02-0.5mm, the width of the second gas supply annular cavity 313, the gap between the gas supply seal 3 and the middle part of the stirring shaft 1, and the gap between the flange 2 and the stirring shaft 1 are 1-125 times of the gap between the gas supply seal 3 and the end of the stirring shaft 1 away from the desulfurization tower, so as to adapt to the setting mode that a large amount of high-pressure gas flows into the first gas inlet channel and a small amount of air flows into the second gas inlet channel.

[0051] Specifically, the gas supply channel 31, the gap between the gas supply seal 3 and the middle part of the stirring shaft 1, and the gap between the flange 2 and the stirring shaft 1 form the first gas inlet channel. The gap between the gas supply seal 3 and the end of the stirring shaft 1 away from the desulfurization tower, the gap between the gas supply seal 3 and the middle part of the stirring shaft 1, and the gap between the flange 2 and the stirring shaft 1 form the second gas inlet channel.

[0052] Further, the gas supply hole 311 is connected to the high-pressure gas source through the air pipe, and the high-pressure gas source supplies high-pressure gas into the gas supply hole 311. It should be noted that the high-pressure gas source is a publicly known technology.

[0053] Further, the end of the stirring shaft 1 close to the desulfurization tower is provided with a paddle, and the end of the stirring shaft 1 away from the desulfurization tower is connected to a driving mechanism. The driving mechanism drives the stirring shaft 1 to rotate, so as to drive the paddle on the stirring shaft 1 to stir the slurry in the desulfurization tower. Specifically, the driving mechanism is an electric motor.

[0054] Further, the circumferential side wall of the end of the stirring shaft 1 away from the desulfurization tower is provided with a screw thread 12. When the stirring shaft 1 rotates around its axis, the slurry in the screw thread 12 can flow from the end of the stirring shaft 1 away from the desulfurization tower to the end of the stirring shaft 1 close to the desulfurization tower.

[0055] When the high-pressure gas source is damaged, the high-pressure gas cannot continue to flow into the gas supply hole 311, and the slurry in the desulfurization tower flows into the gap between the gas supply seal 3 and the stirring shaft 1 through the gap between the flange 2 and the stirring shaft 1. Under the action of the rotation of the stirring shaft 1, the screw thread 12 on the stirring shaft 1 can drive the slurry in the screw thread 12 to flow from the end of the stirring shaft 1 away from the desulfurization tower to the end of the stirring shaft 1 close to the desulfurization tower, and then drive the slurry to flow back into the desulfurization tower, so as to avoid the slurry flowing out of the gap between the stirring shaft 1 and the gas supply seal 3.

[0056] Specifically, the rotation direction of the thread 12 is opposite to the rotation direction of the stirring shaft 1, so that the slurry in the thread 12 can flow from the end of the stirring shaft 1 away from the desulfurization tower to the end of the stirring shaft 1 close to the desulfurization tower.

[0057] Preferably, the radial depth of the thread 12 is greater than 0.3mm, and the pitch of the thread 12 is greater than 1mm.

[0058] Further, the inner circumferential side wall of the flange 2 is provided with a tapered ring groove 21 extending to the end face of the flange 2 away from the gas supply seal 3. The first end of the stirring shaft 1 extends radially outward to form a tapered ring body 11, which is matched with the tapered ring groove 21 in a clearance fit. When the stirring shaft 1 moves axially, the tapered ring body 11 can abut against the tapered ring groove 21.

[0059] When the high-pressure gas source needs to be repaired, the stirring shaft 1 stops rotating, and the stirring shaft 1 is pulled in the axial direction to make the tapered ring body 11 on the stirring shaft 1 abut against the tapered ring groove 21 on the flange 2, so as to close the gap between the stirring shaft 1 and the flange 2, and avoid or reduce the slurry and corrosive gas in the desulfurization tower from flowing out.

[0060] Specifically, the flange 2 and the gas supply seal 3 are detachably connected by bolts.

[0061] Further, the gas pressure sealing mechanism for the desulfurization tower also comprises a bearing seat, which can be arranged on the outer side wall of the desulfurization tower.

[0062] The end of the stirring shaft 1 close to the desulfurization tower is connected through a bearing and a bearing seat, the flange 2 and the bearing seat are connected by bolts, and the stirring shaft 1 and the flange 2 are kept in a clearance fit. The flange 2 is provided with an annular groove 22 on the end face for connecting the bearing seat, and a sealing ring is arranged in the annular groove 22, which is used to seal the gap between the flange 2 and the bearing seat.

[0063] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature is "below", "under" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0064] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can modify, modify, replace and modify the above-described embodiments within the scope of the present application.

Claims

1. A gas pressure sealing mechanism for a desulfurization tower including a stirring shaft (1) capable of passing through a side wall of a desulfurization tower, characterized in that, Also include: Flange (2), the flange (2) is set on the outer periphery of the stirring shaft (1), the flange (2) and the stirring shaft (1) clearance fit, and the flange (2) can be fixedly connected to the outer side wall of the desulfurization tower, the stirring shaft (1) rotates relative to the flange (2); Gas supply seal (3), the gas supply seal (3) is a circular ring body, the gas supply seal (3) is set on the outer periphery of the stirring shaft (1), the gas supply seal (3) and the stirring shaft (1) clearance fit, and the gas supply seal (3) is fixedly connected with the flange (2); The gas supply seal (3) is provided with a gas supply channel (31), and the gas supply channel (31) can be sequentially introduced into the gap between the gas supply seal (3) and the stirring shaft (1), the gap between the flange (2) and the stirring shaft (1) and the gap between the stirring shaft (1) and the side wall of the desulfurization tower; The gas supply channel (31) includes a gas supply hole (311), a first gas supply annular cavity (312) and a second gas supply annular cavity (313), which are sequentially communicated from outside to inside along the radial direction of the gas supply seal (3); The first gas supply annular cavity (312) is a circular ring type, and the longitudinal section of the second gas supply annular cavity (313) is a trapezoidal type, and the second gas supply annular cavity (313) communicates the gap between the gas supply seal (3) and the stirring shaft (1); The inner circumferential side wall of the flange (2) is provided with a tapered ring groove (21), which extends to the end face of the flange (2) away from the gas supply seal (3); The first end of the stirring shaft (1) extends outward along its radial direction to form a tapered ring body (11), which is matched with the tapered ring groove (21) in clearance fit; When the stirring shaft (1) moves along its axial direction, the tapered ring body (11) can abut against the tapered ring groove (21).

2. The gas pressure sealing mechanism for a desulfurizing tower according to claim 1, wherein The gap between the gas supply channel (31), the gas supply seal (3) and the middle part of the stirring shaft (1), the gap between the flange (2) and the stirring shaft (1) forms a first air inlet channel; The gap between the gas supply seal (3) and the stirring shaft (1) away from the desulfurization tower, the gap between the gas supply seal (3) and the middle part of the stirring shaft (1), and the gap between the flange (2) and the stirring shaft (1) form a second air inlet channel.

3. The gas pressure sealing mechanism for a desulfurizing tower according to claim 1, wherein The upper base angle of the longitudinal section of the second gas supply annular cavity (313) is 93-135°.

4. The gas pressure sealing mechanism for a desulfurizing tower according to claim 1, wherein The circumferential side wall of the end of the stirring shaft (1) away from the desulfurization tower is provided with a thread (12); When the stirring shaft (1) rotates around its axis, the slurry in the thread (12) can flow from the end of the stirring shaft (1) away from the desulfurization tower to the end of the stirring shaft (1) close to the desulfurization tower.

5. The gas pressure sealing mechanism for a desulfurizing tower according to claim 4, wherein The rotation direction of the thread (12) is opposite to the rotation direction of the stirring shaft (1).

6. The gas pressure sealing mechanism for a desulfurizing tower according to claim 1, wherein Also include a bearing seat, the bearing seat can be set on the desulfurization tower; The stirring shaft (1) is connected by a bearing and the bearing seat near one end of the desulfurization tower; The flange (2) and the bearing seat are connected.

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