CN112855604A - Sealing system for sulfur dioxide fan - Google Patents
Sealing system for sulfur dioxide fan Download PDFInfo
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- CN112855604A CN112855604A CN202110037962.4A CN202110037962A CN112855604A CN 112855604 A CN112855604 A CN 112855604A CN 202110037962 A CN202110037962 A CN 202110037962A CN 112855604 A CN112855604 A CN 112855604A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of sealing structures of industrial equipment for sulfuric acid production, in particular to a sealing system for a sulfur dioxide fan. The technical problems that sulfur dioxide gas leakage exists at the negative pressure end of a centrifugal multistage impeller sulfur dioxide fan in the prior art, so that the total content of sulfur dioxide entering and converting is low, and effective air compensation cannot be realized are solved; the return pipe group is connected with the sealing device and the fan multistage impeller chamber and receives negative pressure formed by the guide of the fan multistage impeller chamber; the control unit is used for controlling the time when the backflow pipe group leads the backflow pipe group to form negative pressure by the fan multi-stage impeller chamber. The advantage of this technical scheme lies in, can reduce the leakage amount of sulfur dioxide effectively, and can form effectual compensation total tolerance, also need not to introduce external medium, and it is little to the production system impact when compensating the tolerance, is favorable to the control of process gas proportion, and is energy-concerving and environment-protective.
Description
Technical Field
The invention relates to the technical field of sealing structures of industrial equipment for sulfuric acid production, in particular to a sealing system for a sulfur dioxide fan.
Background
Under the current trend, the development direction of the sulfuric acid industry gradually replaces the traditional pyrite acid making, and is directed to the flue gas acid making and the waste sulfuric acid cracking acid making; the flue gas acid making and the waste sulfuric acid cracking acid making can also obtain abundant sulfur dioxide process gas, so that the production of sulfuric acid is released from the high-pollution and high-energy-consumption position, and the method is replaced by collecting the sulfur dioxide process gas acid making, thereby realizing energy conservation and environmental protection and supporting the development of the chemical industry.
It should be noted that the key to restrict the process for producing acid from sulfur dioxide process gas is that, because the sulfur dioxide content in unit volume is low, taking the sulfur dioxide collected by a thermal power desulfurization system as an example, the sulfur dioxide content in the collected process gas is different from 2% to 6%, the flue gas acid production can be stabilized between 4.5% and 6%, the waste sulfuric acid cracking acid production can be stabilized between 3.5% and 5%, and the process is actually influenced by the water content of the waste sulfuric acid.
In the prior art, in the actual process production process, a centrifugal multi-impeller sulfur dioxide fan with the similar working principle with a compressor is needed to obtain the content of sulfur dioxide with high energy per unit volume, but in the actual operation, the sulfur dioxide fan has the characteristic of a negative pressure end, so that the sealing is caused, generally, the labyrinth seal can generate sulfur dioxide gas corrosion, and the reason is that the flow rate of the process gas in a compensating pipe of the negative pressure end of the sulfur dioxide fan is too high, and once the labyrinth seal is damaged, the process gas amount is difficult to compensate, and the leakage is serious.
Disclosure of Invention
The invention provides a sealing system for a sulfur dioxide fan, and aims to solve the technical problems that sulfur dioxide gas leakage exists at the negative pressure end of the centrifugal multistage impeller sulfur dioxide fan in the prior art, so that the total content of sulfur dioxide in the steam is low, and effective air compensation cannot be realized.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a sealing system for a sulphur dioxide blower comprising:
a sealing device connected on a shell at one suction end of the sulfur dioxide fan,
to act as a seal for the suction side rotor;
a return pipe group which is connected with the sealing device and the fan multi-stage impeller chamber and receives negative pressure formed by the guiding of the fan multi-stage impeller chamber;
a control unit for controlling the timing of the return pipe group guiding the return pipe group to form negative pressure by the fan multistage impeller chamber;
the sealing device includes:
a first seal assembly disposed adjacent to the suction side housing and capable of forming a first sealed chamber enabling intermittent compression of a process gas;
a second seal assembly integrated with a moving ring and a stationary ring to connect the first seal assembly; and
a third seal assembly forming a second seal chamber and connected to the second seal assembly;
wherein the reflux tube group can be communicated with the first sealing chamber and the second sealing chamber, so that the control unit can determine whether to guide the reflux tube group to form the negative pressure or not based on the real-time value of the temperature or the pressure between the first sealing chamber and the second sealing chamber.
Specifically, the sealing device includes:
a first housing having a second end connected to the suction-side housing;
a second housing having a first end connected to the first end of the first housing;
a third housing, a second end of which is connected with the first end of the first housing;
the return line group includes:
one end of the first-stage return pipe is connected and communicated with the suction end shell, and the other end of the first-stage return pipe can vertically penetrate into the first shell;
and one end of the second-stage return pipe is connected with the first-stage return pipe, and the other end of the second-stage return pipe penetrates into the third shell.
Specifically, the first seal assembly includes:
the first sealing element is formed at one section of the first shell, and forms a first sealing gap with a bearing bush connected with a main shaft of the fan;
a compression sleeve fixed to the second housing with a first end portion extending beyond the compression sleeve;
the second end of the compression sleeve is bent towards the direction far away from the suction end shell and is connected with a structural seal, the structural seal and the compression sleeve are matched to form an L-shaped compression space, and the compression space is communicated with the first sealing chamber;
the primary return pipe is communicated with the compression sleeve;
a compression cylinder mounted at a first end of the compression sleeve, and a piston end of the compression cylinder capable of being reciprocally pushed along an inside of the compression sleeve in a vertical direction.
Specifically, the construction seal includes:
a transverse nipple coupled to the compression sleeve second end;
a first filling body;
a nipple seal ring, the first obturator positioned between the transverse nipple and the nipple seal ring;
a second filling body capable of being fixed and partially filled in the first sealing chamber
The connecting sleeve sealing ring and the second filling body are clamped on a bearing bush sleeve.
Specifically, the method further comprises the following steps:
a third filling body, wherein a partition plate is also arranged in the first sealing chamber;
one end part of the isolating plate is fixedly connected with the second shell, and the other end of the isolating plate is fixedly connected in the radial direction of the compression sleeve so as to seal and separate the primary return pipe from the structure;
the third filling body and the second filling body are fixed on the isolation plate.
Specifically, the second seal assembly includes:
a stationary ring support secured within the second housing;
the limiting ring is clamped on the bearing bush and the static ring bracket;
the static ring is arranged on the inner support frame;
the movable ring bracket is arranged on the bearing bush, and the movable ring is arranged on the movable ring bracket;
a mid-section seal disposed between the stationary ring and the moving ring and mounted within the second housing.
Specifically, the method further comprises the following steps:
an expansion tube captured at the second ends of the retaining ring and the stationary ring carrier;
the expansion pipe comprises a first pipe section and a second pipe section;
the diameter of the second pipe section is larger than that of the first pipe section;
the second pipe section constructs expansion corrugation, and an expansion gap is formed between the second pipe section and the static ring support;
the distance of the expansion gap is from one to two times of the expansion amount of the expansion corrugation;
the expansion pipe is made of Hastelloy.
Specifically, the third sealing component is a labyrinth seal assembly;
the comb tooth part of the labyrinth seal assembly is sharp in structure when viewed in the cross section direction.
Specifically, the control unit includes:
the cylinder execution module is used for driving the reciprocating action of the compression cylinder;
the communication execution module is used for driving the opening action of a control valve arranged on the secondary return pipe;
the temperature detection module detects the temperature of the primary return pipe through a thermocouple element;
the first pressure detection module detects the pressure of the first sealing chamber through a first pressure sensor;
the second pressure detection module detects the pressure of the second sealing chamber through a second pressure sensor;
and the identification module is used for receiving the temperature detection module, the first pressure detection module and the second pressure detection module and identifying and controlling the action time of the cylinder execution module and the communication execution module through a logic judgment program.
Specifically, the method for identifying and controlling the action timing of the cylinder execution module and the communication execution module by the logic judgment program comprises the following modes:
firstly, identifying whether the temperature value detected by the temperature detection module is in a preset range or not;
identifying whether the pressure values of the first pressure detection module and the second pressure detection module are within a preset range;
when the opening degree of the control valve is within the preset range, the control valve is kept in a state of a preset opening degree;
fourthly, when the temperature value detected by the identification temperature detection module exceeds the preset range, the control valve acts to a normally open state with the maximum opening degree, and acts to a state with the preset opening degree when the temperature value returns to the preset range again;
fifthly, when the temperature value detected and obtained by the identification temperature detection module is lower than the preset range, the cylinder execution module is driven to work;
setting the pressure of the first sealing chamber to be P;
setting the pressure of the second sealing chamber to be P;
when P is larger than or equal to P, the control valve acts to a normally open state with the maximum opening degree;
and when the P is greater than or equal to the factor of P, the cylinder execution module stops working. .
The invention has the following beneficial effects:
the advantage of this technical scheme lies in, can reduce the leakage amount of sulfur dioxide effectively, and can form effectual compensation total tolerance, also need not to introduce external medium, and it is little to the production system impact when compensating the tolerance, is favorable to the control of process gas proportion, and is energy-concerving and environment-protective.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a control unit of the present invention;
fig. 3 is a functional schematic diagram of the method of the present invention.
The reference numerals in the figures denote:
the device comprises a sealing device 100, a suction end shell 1, a return pipe group 200, a fan multistage impeller chamber 2 and a control unit 300;
the first sealing assembly 10, the second sealing assembly 20, the movable ring 21, the static ring 22 and the third sealing assembly 30;
a first shell 110, a second shell 120, a third shell 130, a primary return pipe 210, a secondary return pipe 220;
a first seal 11, a compression sleeve 12, a construction seal 13, a compression space 14, a compression cylinder 15, a partition plate 16;
a transverse nipple 131, a first filler 132, a nipple sealing ring 133, a second filler 135, a third filler 136;
a static ring bracket 23, a limiting ring 24, a dynamic ring bracket 25 and a middle section seal 26;
the comb tooth part 31, the cylinder execution module 310, the communication execution module 320 and the control valve 321;
a temperature detection module 330, a thermocouple element 331;
a first pressure detection module 340, a second pressure detection module 350, and an identification module 360.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention; for convenience of description, in the present application, "left side" is "first end", "right side" is "second end", "upper side" is "first end", and "lower side" is "second end" in the current view, so that the description is for the purpose of clearly expressing the technical solution, and should not be construed as an improper limitation to the technical solution of the present application.
The invention aims to solve the technical problems that sulfur dioxide gas leakage exists at the negative pressure end of a centrifugal multistage impeller sulfur dioxide fan in the prior art, so that the total content of sulfur dioxide in the steam is low, and effective gas compensation cannot be realized. Referring to fig. 1, the sealing system for a sulfur dioxide blower includes: a sealing device 100 connected to a suction end housing 1 of the sulfur dioxide blower as a seal of the suction end rotor; a return pipe group 200 which connects the sealing device 100 and the fan multistage impeller chamber 2 and receives a negative pressure induced by the fan multistage impeller chamber 2; a control unit 300 for controlling a timing at which the backflow pipe group 200 is guided by the blower multistage impeller chamber 2 to form a negative pressure in the backflow pipe group 200;
the sealing device 100 includes: a first seal assembly 10 which is disposed adjacent to the suction side housing 1 and which is capable of forming a first seal chamber 101 enabling the process gas to be intermittently compressed; a second seal assembly 20 integrated with a moving ring 21 and a stationary ring 22 to connect the first seal assembly 10; and a third seal assembly 30 forming a second seal chamber 102 and connected to the second seal assembly 20;
wherein the backflow pipe set 200 can communicate the first sealing chamber 101 and the second sealing chamber 102, so that the control unit 300 can determine whether to guide the backflow pipe set 200 to form the negative pressure based on the real-time value of the temperature or the pressure between the two.
The sealing device 100 is equivalent to three sealing devices, and is mainly used for solving the problem of sealing leakage, and the main defects of the prior art that the labyrinth seal is adopted are that when the gas flow rate is too high, the flow rate of sulfur dioxide gas is too high, the corrosion of the labyrinth seal is clamped, and after the labyrinth seal is corroded, the labyrinth seal cannot form a gas film, the leakage is intensified, and the friction is reduced, and under the condition of large leakage amount, not only the leaked sulfur dioxide gas influences the working environment and brings great harm, but also the heat generated by the friction between the gas and the seal is lost during backflow, the temperature of process gas is impacted, so that the condensed acid is increased, the working temperature of a specific sulfur dioxide fan is 72-78 ℃, therefore, the temperature of the industrial sulfuric acid production in the approximate range of a conversion process can be different according to different production scales, but can not be lower than 68 ℃ at least, then entering a heating section of the converter; according to the technical scheme, the sealing problem is solved through three groups of seals, and the process gas can be intermittently compressed to realize the effect of forced heating. The negative pressure of the seal needs to be balanced, i.e. the pressures of the first seal chamber 101 and the second seal chamber 102, so that the third sealing device can have a better working state and the leakage amount can be controlled.
Referring to fig. 1, a sealing device 100 includes: a first housing 110 having a second end connected to the suction-side housing 1; a second housing 120 having a first end connected to the first end of the first housing 110;
a third housing 130 having a second end connected to the first end of the first housing 120;
the return line set 200 includes: a primary return pipe 210, one end of which is connected and communicated to the suction-side housing 1, and the other end of which can vertically penetrate into the first housing 110; and a secondary return pipe 220 having one end connected to the primary return pipe 210 and the other end penetrating into the third housing 130.
Referring to fig. 1, a first seal assembly 10 includes: a first sealing member 11 formed at a section of the first housing 110 and forming a first sealing gap with the bearing bush 3 connected to the fan main shaft 4; a compression sleeve 12 fixed to the second housing 120 and having a first end portion extending out of the compression sleeve 12; the second end of the compression sleeve 12 is bent towards the direction far away from the suction end shell 1 and is connected with a structural seal 13, the structural seal 13 and the compression sleeve 12 are matched to form an L-shaped compression space 14, and the compression space is communicated with the first sealing chamber 101; the primary return pipe 210 is communicated with the compression sleeve 12; the compression cylinder 15 is installed at the first end of the compression sleeve 12, and the piston end of the compression cylinder 15 can be pushed along the inside of the compression sleeve 12 in a vertical direction, the first sealing element 11 can continue to adopt labyrinth seal, the principle is that labyrinth seal is obviously the most preferred embodiment, and under the cooperation of the second sealing assembly 20 and the third sealing assembly 30 and the control system of the technical scheme, the durability of the first sealing element 11 adopting labyrinth seal is obviously improved, and the service life is longer.
Referring to fig. 1, the structural seal 13 includes: a transverse nipple 131 connected to the second end of the compression sleeve 12; a first filling body 132; a nipple sealing ring 133, the first filling body 132 being located between the transverse nipple 131 and the nipple sealing ring 133; a second filling body 135 which can be fixed and is partially filled in the first sealing chamber, and the joint sleeve sealing ring 133 is clamped on a bearing bush sleeve 134 and the second filling body 135; this realizes the configuration of the first sealed chamber 101 and the compression space 14.
Please refer to fig. 1, which further includes: a third filling body 136, wherein the first sealing chamber 101 is also provided with an isolation plate 16; one end portion of the partition plate 16 is fixedly connected to the second housing 120, and the other end portion thereof is fixedly connected to the radial direction of the compression sleeve 12 to separate the primary return pipe 210 from the structural seal 13; wherein, the third filling body 136 and the second filling body 135 are fixed on the isolation plate 16; the purpose of the partition 16 is to further separate the space and prevent leakage from the mechanical connection between the housing structure and the primary return pipe 210.
Referring to fig. 1, in order to stabilize the balance and enhance the sealing effect, a second sealing assembly 20 is used, which specifically includes: a stationary ring holder 23 fixed in the second housing 120; the limiting ring 24 is clamped on the bearing bush 3 and the static ring bracket 23; the static ring 21 is arranged on the inner support frame 23; the movable ring bracket 25 is arranged on the bearing bush 3, and the movable ring is arranged on the movable ring bracket 25; a mid-section seal 26 disposed between the stationary ring 21 and the moving ring 22 and mounted within the second housing 120; specifically, there are other clearances, such as the sealing problems caused by the secondary clearances on the bearing shells, that need to be addressed by the second seal assembly 20.
In addition, please refer to fig. 1, which further includes: an expansion tube 27 retained at a second end of the stop collar 21 and the stationary ring support 23; the expansion conduit 27 comprises a first conduit section and a second conduit section; the diameter of the second pipe section is larger than that of the first pipe section; the second pipe section forms an expansion corrugation, and an expansion gap is formed between the second pipe section and the static ring support 23; the distance of the expansion gap is 1.15 to 1.35 times the expansion amount of the expansion corrugation;
the expansion pipe 27 is made of hastelloy, and the expansion pipe 27 buffers temperature difference generated by starting and stopping.
Referring to FIG. 1, the third seal assembly 30 is a labyrinth seal assembly; wherein, the comb tooth part 31 of the labyrinth seal assembly is in a sharp structure when viewed in the cross section direction; it will be appreciated that a labyrinth seal is employed at the most distal end, which is a seal to the second seal assembly 20 and not to the direct action sulphur dioxide blower.
Referring to fig. 1 and 2, the control unit 300 includes: a cylinder actuator 310 for driving the reciprocating motion of the compression cylinder 15; a communication executing module 320 for driving the opening of a control valve 321 disposed on the secondary return pipe 220; a temperature detecting module 330 for detecting the temperature of the primary return pipe 210 through a thermocouple device 331; a first pressure detection module 340 for detecting the pressure of the first sealing chamber 101 by a first pressure sensor 341; a second pressure detection module 350 for detecting the pressure of the second sealed chamber 102 by a second pressure sensor 351; the identification module 360 is configured to receive the temperature detection module 330, the first pressure detection module 340, and the second pressure detection module 350, and identify the operation timings of the control cylinder execution module 310 and the communication execution module 320 through a logic determination procedure.
Referring to fig. 1-3, the method for identifying the action timing of the control cylinder execution module 310 and the communication execution module 320 by the logic determination program includes the following steps: the identification temperature detection module 330 detects whether the obtained temperature value is within a preset range; identifying whether the pressure values of the first pressure detection module 340 and the second pressure detection module 350 are within a preset range; when the above are all within the preset range, the control valve 321 is kept in a state of a preset opening degree; when the temperature value detected by the identification temperature detection module 330 is out of the preset range, the control valve 321 is operated to a normally open state with the maximum opening degree, and when the temperature value returns to the preset range again, the control valve is operated to a preset opening degree state; when the temperature value detected by the identification temperature detection module 330 is lower than the preset range, the actuating cylinder execution module 310 is driven to operate;
setting the pressure of the first seal chamber 101 to P1; setting the pressure of the second sealed chamber 102 to P2;
when the P1 is greater than or equal to 1.15 times of the P2, the control valve 321 is operated to be normally open and the opening degree is maximum; the cylinder actuation module 310 deactivates when the P1 is greater than or equal to 1.35 times the P2.
In conclusion, the technical scheme has the advantages that the leakage amount of sulfur dioxide can be effectively reduced, the effective compensation total gas amount can be formed, an external medium does not need to be introduced, the impact on a production system is small when the gas amount is compensated, the control of the process gas proportion is facilitated, and the energy conservation and the environmental protection are realized.
In order to further illustrate the technical advantages of the technical scheme in practical application, the invention provides a specific application example to prove that the invention specifically comprises two 315KW sulfur dioxide fan units, and the process gas flow is 4000m for each unit3The process gas amount fluctuates by 30% under the condition of frequency conversion, the working negative pressure of the sulfur dioxide fan is-40 KPa to-60 KPa, the case of sealed leakage of the machine shell occurs in the use process, the spilled SO2 gas has strong irritation, the irritation and damage to the eyes and respiratory tract of an operator are particularly serious, the operator can only wear a gas mask after entering the gas mask for a short time, serious occupational health hazards are generated, and through field detection, the content of SO2 in the sulfur dioxide fan room and the nearby sulfur dioxide fan room seriously exceeds the standard in GBZ 2.1.1-2007 work place harmful factor occupational contact limit, and potential hazards to the surrounding environment exist. The leaked SO2 content reaches up to 100ppm (286 mg/m)3) In the using process of the equipment, operators in the wind turbine room cannot enter the equipment at all, and can only wear the gas mask after entering the equipment for a short time. According to the standard 'workplace harmful factor occupational contact restriction' GBZ 2.1.1-2007, the content of workplace SO2 is controlled to be less than 5mg/m3(1.75ppm) and a maximum value of not more than 10mg/m3(3.5ppm), the previous actual conditions were:
target range: conversion process, sulfur dioxide fan room and the periphery
The target basis is as follows: GBZ 2.1.1-2007 workplace harmful factor occupational contact limits-chemical factors
Primary target: the average SO2 content is less than 4.2PPM or 12mg/m3
Secondary target: the SO2 content in the workplace is controlled to be less than 5mg/m instantaneously3(1.75ppm) and a maximum value of not more than 12mg/m3(4.2ppm)。
After the technical scheme of the invention is implemented, the following table shows
| Position of | Average SO2 content ppm | Peak SO2 content ppm | Peak SO2 content mg/m3 |
| Sulfur dioxide fan house | 1.6 | 3.0 | 8.58 |
| Door of north side room | 1.5 | 2.09 | 6.006 |
| Conversion procedure (within a radius of about 20 m) | 1.34 | 1.67 | 4.86 |
Measured values of sulfur dioxide in all regions meet the standard GBZ 2.1.1-2007 & lt & ltworkplace harmful factor occupational contact restriction & gt & lt & gt & lt & gt chemical factors, which are indexes measured when a sulfur dioxide fan is sealed without leakage faults, and technical indexes which can reach the standard when a device region is judged under the condition that;
in addition, the invention provides another application example 2 to illustrate the compensation effect on the process gas amount, specifically, the content of the sulfur dioxide amount is detected, taking the detection of a sulfur dioxide fan outlet as an example, the content of the sulfur dioxide amount is improved by about 0.7-1.2%, the actual conversion rate is increased from 96.75% to 98.99-99.55%, and even if the influence of process gas collection equipment and quality still exists, the application of the technical scheme is still obviously improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A sealing system for a sulphur dioxide blower, comprising:
a sealing device (100) connected to a suction end housing (1) of the sulphur dioxide blower as a seal for the suction end rotor;
a return pipe group (200) which is connected to the sealing device (100) and the fan multi-stage impeller chamber (2) and receives a negative pressure induced by the fan multi-stage impeller chamber (2);
a control unit (300) to control the timing at which the set of return pipes (200) is directed by the blower multi-stage impeller chamber (2) to create negative pressure;
the sealing device (100) comprises:
a first seal assembly (10) arranged adjacent to the suction side housing (1) and capable of forming a first sealed chamber (101) enabling intermittent compression of a process gas;
a second sealing assembly (20) integrating a moving ring (21) and a stationary ring (22) to connect the first sealing assembly (10); and
a third seal assembly (30) forming a second seal chamber (102) and connected to the second seal assembly (20);
wherein the backflow pipe set (200) can be communicated with the first sealing chamber (101) and the second sealing chamber (102) so that the control unit (300) can determine whether to guide the backflow pipe set (200) to form negative pressure or not based on the real-time value of the temperature or the pressure between the backflow pipe set and the second sealing chamber.
2. The sealing system for a sulphur dioxide blower according to claim 1, wherein the sealing device (100) comprises:
a first housing (110) having a second end connected to the suction-side housing (1);
a second housing (120) having a first end connected to the first end of the first housing (110);
a third housing (130) having a second end connected to the first end of the first housing (120);
the return line group (200) includes:
a primary return pipe (210), one end of which is connected and communicated with the suction-end shell (1), and the other end of which can vertically penetrate into the first shell (110);
and one end of the secondary return pipe (220) is connected with the primary return pipe (210), and the other end of the secondary return pipe penetrates into the third shell (130).
3. The sealing system for a sulphur dioxide blower according to claim 2, wherein the first sealing assembly (10) comprises:
the first sealing element (11) is formed at one section of the first shell (110) and forms a first sealing gap with a bearing bush (3) connected with a main shaft (4) of the fan;
a compression sleeve (12) fixed to the second housing (120) and having a first end portion extending beyond the compression sleeve (12);
the second end of the compression sleeve (12) is bent towards the direction far away from the suction end shell (1) and is connected with a structural seal (13), the structural seal (13) and the compression sleeve (12) are matched to form an L-shaped compression space (14), and the compression space is communicated with the first sealing chamber (101);
the primary return pipe (210) is communicated with the compression sleeve (12);
a compression cylinder (15) mounted at a first end of the compression sleeve (12), and a piston end of the compression cylinder (15) is capable of being reciprocally pushed along an interior of the compression sleeve (12) in a vertical direction.
4. A sealing system for a sulphur dioxide blower according to claim 3, wherein the construction seal (13) comprises:
a transverse nipple (131) connected to the second end of the compression sleeve (12);
a first filling body (132);
a nipple sealing ring (133), the first filling body (132) being located in the transverse nipple (131)
And
between the nipple sealing rings (133);
a second filling body (135) which can be fixed and is partially filled in the first sealing chamber
The adapter sleeve sealing ring (133) is clamped on a bearing bush sleeve (134) and the second filling body (135).
5. The sealing system for a sulfur dioxide blower of claim 4 further comprising:
a third filling body (136), wherein an isolation plate (16) is arranged in the first sealing chamber (101); one end part of the isolation plate (16) is fixedly connected with the second shell (120), and the other end of the isolation plate is fixedly connected with the radial direction of the compression sleeve (12) so as to separate the primary return pipe (210) from the structural seal (13);
wherein the third filling body (136) and the second filling body (135) are fixed on the isolation plate (16).
6. The sealing system for a sulphur dioxide blower according to claim 5, wherein the second sealing assembly (20) comprises:
a stationary ring holder (23) fixed within the second housing (120);
the limiting ring (24) is clamped on the bearing bush (3) and the static ring bracket (23);
the stationary ring (21) is mounted on the inner support frame (23);
the movable ring support (25) is arranged on the bearing bush (3), and the movable ring is arranged on the movable ring support (25);
a mid-section seal (26) disposed between the stationary ring (21) and the moving ring (22) and mounted within the second housing (120).
7. The seal system for a sulfur dioxide blower of claim 6 further comprising:
an expansion tube (27) captured at a second end of the retainer ring (21) and the stationary ring carrier (23);
the expansion pipe (27) comprises a first pipe section and a second pipe section;
the diameter of the second pipe section is larger than that of the first pipe section;
the second pipe section constructs expansion corrugation, and an expansion gap is formed between the second pipe section and the static ring bracket (23);
the distance of the expansion gap is 1.15 to 1.35 times the expansion amount of the expansion corrugation;
wherein the expansion pipe (27) is made of hastelloy.
8. The sealing system for a sulphur dioxide fan according to claim 7, wherein the third sealing member (30) is a labyrinth seal assembly;
wherein, the comb tooth part (31) of the labyrinth seal assembly is in a sharp structure when viewed in a cross section direction.
9. The sealing system for a sulphur dioxide blower according to claim 8, wherein the control unit (300) comprises:
a cylinder actuation module (310) to drive the reciprocating action of the compression cylinder (15);
a communication execution module (320) for driving the opening action of a control valve (321) arranged on the secondary return pipe (220);
a temperature detection module (330) for detecting the temperature of the primary return pipe (210) through a thermocouple element (331);
a first pressure detection module (340) for detecting a pressure of the first sealing chamber (101) by a first pressure sensor (341);
a second pressure detection module (350) for detecting the pressure of the second sealed chamber (102) by a second pressure sensor (351);
the identification module (360) is used for receiving the temperature detection module (330), the first pressure detection module (340) and the second pressure detection module (350) and identifying and controlling the action time of the cylinder execution module (310) and the communication execution module (320) through a logic judgment program.
10. The sealing system for a sulfur dioxide blower of claim 9, wherein the method of identifying the timing of the operations of controlling the cylinder execution module (310) and the communication execution module (320) by the logic judgment program comprises the following modes:
firstly, identifying whether the temperature value detected by the temperature detection module (330) is in a preset range;
identifying whether the pressure values of the first pressure detection module (340) and the second pressure detection module (350) are within a preset range;
when the above ranges are all within the preset range, the control valve (321) is kept in a state of a preset opening degree;
secondly, when the temperature value detected by the identification temperature detection module (330) exceeds the preset range, the control valve (321) acts to a normally open state with the maximum opening degree, and when the temperature value returns to the preset range again, the control valve acts to a preset opening degree state;
thirdly, when the temperature value detected and obtained by the identification temperature detection module (330) is lower than the preset range, the cylinder execution module (310) is driven to work;
setting the pressure of the first seal chamber (101) to P1;
setting the pressure of the second sealed chamber (102) to P2;
when the P1 is more than or equal to 1.15 times of the P2, the control valve (321) acts to be in a normally open state and the opening degree is the maximum;
when the P1 is more than or equal to 1.35 times of the P2, the cylinder execution module (310) stops working.
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| CN202110037962.4A CN112855604B (en) | 2021-01-12 | 2021-01-12 | Sealing system for sulfur dioxide fan |
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| CN202110037962.4A CN112855604B (en) | 2021-01-12 | 2021-01-12 | Sealing system for sulfur dioxide fan |
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| CN112855604B CN112855604B (en) | 2022-10-21 |
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| CN112855604B (en) | 2022-10-21 |
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