CN217130339U - Dry gas sealing system of synthesis gas compressor - Google Patents
Dry gas sealing system of synthesis gas compressor Download PDFInfo
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- CN217130339U CN217130339U CN202220578424.6U CN202220578424U CN217130339U CN 217130339 U CN217130339 U CN 217130339U CN 202220578424 U CN202220578424 U CN 202220578424U CN 217130339 U CN217130339 U CN 217130339U
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Abstract
The utility model relates to the technical field of dry gas sealing of compressors, and discloses a dry gas sealing system of a synthesis gas compressor; comprises a ventilation unit and a sealing unit; the sealing unit comprises at least two stages of sealing devices; each stage of sealing device is correspondingly provided with a group of air inlet channels and air outlet channels; the air inlet channel and the air outlet channel are connected with the ventilation unit through pipelines; and the pipeline outside the air inlet channel is connected with a ventilation pipeline in parallel. In the scheme, according to the starting state of the synthesis gas compressor, the PLC controls the opening or closing of different control valves alternately to achieve dry gas sealing on the synthesis gas compressor, so that the synthesis gas compressor is fully sealedAvoidance of syngas leakage and N 2 Blow-by into the syngas affects the use of the syngas.
Description
Technical Field
The utility model relates to a sealed technical field of compressor dry gas, concretely relates to synthetic gas compressor's dry gas sealing system.
Background
Methanol is one of the most important raw materials in chemical, petrochemical and energy industries, and can be processed into bulk chemicals (such as formaldehyde and acetic acid), synthetic fuels (such as MTBE and DME) in industrial application, and the application of the methanol-to-olefin (MTO) and gasoline blend is guided by the displacement of product oil in the aspect of energy, and the demand amount of the methanol-to-olefin (MTO) and gasoline blend is huge.
Generally, in the production of methanol, CO and H as main components are first produced from natural gas or coal 2 Of the synthesis gas of (2), separating CO and H from the synthesis gas 2 The ratio of the synthesis gas is adjusted to be suitable for preparing the methanol, then the synthesis gas with the adjusted ratio is compressed by a synthesis gas compressor to increase the pressure of the synthesis gas from normal pressure to a suitable pressure (generally 2.5-5.0 MPa), and then the synthesis gas is further subjected to catalytic reaction to prepare the methanol. In this process, CO and H 2 The proper proportion of the catalyst has great influence on the yield of the methanol.
The existing synthesis gas compressor generally comprises a compressor main body and a bearing for fixing the compressor main body, and a dry gas seal is needed to prevent synthesis gas from flowing out of the compressor in the operation process of the compressor, so that the dry gas seal is arranged on the contact end surface of the compressor main body and the bearing, and the leakage of the synthesis gas and lubricating oil is prevented. Currently, N is frequently used 2 For sealing compressors, during which, however, N 2 The blow-by into the compression chamber is liable to cause CO and H in the synthesis gas 2 The ratio of (a) to (b) is varied, thereby affecting the yield of methanol from synthesis gas.
The prior art CN208487053U discloses an oil blocking device for a dry gas seal cavity, which seals the synthesis gas and the lubricating oil in the synthesis gas compressor by arranging a fixed part and two stages of seal parts connected in series. However, the prior art still has the following problems:
1) the prior art only has one gas inlet and outlet, and if the sealing gas is changed, the sealing gas is directly discharged into the air (such as CO and H gases which can participate in methanol synthesis) 2 Or CO 2 Etc.), the direct discharge of such gases will cause damage to the atmosphere, and thus the burden on the environment will be irreparable, so the structure of only one gas inlet/outlet has a great limitation to the use of other gases as the sealing gas.
2) In view of N 2 The emission to the atmosphere does not cause environmental pollution and characteristics, and the prior art still adopts N 2 For dry-gas sealing of compressors, however in this method N 2 Easy to pass into synthetic gas to change CO and H in synthetic gas 2 The ratio of (2) increases the loss of effective carbon source, causes the material consumption and energy consumption of unit product methanol to increase, greatly reduces the reaction efficiency, and even causes the shutdown.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a dry gas seal system of synthetic gas compressor to solve among the prior art because of only a sealed gas is imported and exported and make the N of conventional use 2 Directly blowed into the compression chamber to synthesize CO and H in the synthesis gas 2 The ratio of (a) and (b) causes an influence, thereby influencing the technical problem of the subsequent methanol synthesis.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a dry gas sealing system of a synthesis gas compressor comprises a ventilation unit and a sealing unit; the sealing unit comprises at least two stages of sealing devices; the sealing devices are respectively and correspondingly provided with a group of air inlet channels and air outlet channels; the air inlet channel and the air outlet channel are connected with the ventilation unit through pipelines; and the pipeline outside the air inlet channel is connected with a ventilation pipeline in parallel.
The principle and the advantages of the scheme are as follows:
1. compared with the prior art that only a set of inlet channel and outlet channel are compared, this scheme includes two at least stages of sealing device, every stage of sealing device all corresponds and is equipped with a set of inlet channel and outlet channel, multiunit inlet channel and outlet channel are convenient for select the operator individual as required to select different seal gas combination to seal synthetic gas and lubricating oil, when avoiding appearing only a set of inlet channel and outlet channel among the prior art, the preference does not cause the N of pollution to the air 2 As the seal gas, the proportion of the components of the synthesis gas is changed, and the efficiency of the synthesis gas for preparing the methanol is further influenced.
2. All adopt N in the prior art 2 As the sealing gas is different, the ventilation unit comprises the ventilation pipelines connected in parallel, so that an operator can alternately introduce different sealing gases to meet different requirements according to the different sealing gases required by the compressor in the starting state and the shutdown state, and the requirement is met if the compressor is shut downIn this state, N is required to be introduced 2 Purging the instrument and the instrument together to keep the instrument clean; and in the starting state of the compressor, the sealing gas can be introduced in stages, and the sealing gas close to the compression cavity selects gas which has little or no influence on the preparation of methanol from the synthesis gas, such as the synthesis gas or CO 2 N is selected as the seal gas far away from the compression chamber 2 Avoidance of syngas or CO 2 The discharge into the air affects the air.
Preferably, the sealing device further comprises a main body unit and a control unit, wherein the main body unit comprises a static ring in interference fit with the rotating shaft and a shell in clearance fit with the rotating shaft, the shell is positioned outside the static ring, and the sealing unit is rotatably connected between the static ring and the shell; the shell is provided with a plurality of groups of radial through holes, the radial through holes are air inlet channels and air outlet channels, each air inlet channel and each air outlet channel are externally connected with a ventilation pipeline connected in parallel, the ventilation pipelines are provided with control valves, and all the control valves are in signal connection with the control unit.
Adopt above-mentioned scheme, quiet ring rotates along with the pivot, and the shell rotates along with the pivot and keeps quiescent condition, and sealing unit swivelling joint is between quiet ring and shell, forms the air film and realizes the sealed of synthetic gas through letting in sealed gas, and the shell keeps static the letting in and the discharge of the control unit control sealed gas of being convenient for more simultaneously.
Preferably, the sealing unit comprises three sealing devices which are arranged in series, the three sealing devices are a first sealing device, a second sealing device and a third sealing device in sequence along the direction far away from the compression cavity, the dry gas sealing channel volume of the first sealing device is larger than that of the second sealing device, and the dry gas sealing channel volume of the second sealing device is larger than that of the third sealing device. By adopting the scheme, the sealing gas far away from the compression cavity is further prevented from entering the compression cavity, so that the proportion of each component in the synthesis gas is influenced.
Preferably, the first-stage sealing device is correspondingly provided with a first air inlet channel and a first air outlet channel; one side of the static ring, which is close to the compression cavity, protrudes radially to form a baffle ring, the first-stage sealing device sequentially comprises a first baffle ring and a first positioning sleeve which are in interference fit with the static ring along the direction far away from the compression cavity, and the first baffle ring is tightly abutted to the baffle ring; a first sliding ring and a first moving ring are arranged outside the first positioning sleeve in a clearance fit mode, a groove is formed in the contact surface of the first moving ring and the first sliding ring, and an elastic part is arranged in the groove; the outer wall of the first rotating ring is rotatably connected with the shell.
By adopting the scheme, the first sealing gas enters the first sealing device from the first gas inlet channel, the first sliding ring is pushed under the action of air pressure, the first sliding ring is far away from the first baffle ring under the action of the elastic part, the sealing gas flows along the gap between the end face of the first baffle ring and the end face of the first sliding ring, the gap between the first fixing sleeve and the first sliding ring, and the gap between the first fixing sleeve and the first movable ring, and is discharged from the first gas outlet channel, and a gas film is formed between the gaps in the flowing process of the first sealing gas, so that the leakage of the synthetic gas is effectively prevented.
Preferably, the second-stage sealing device is correspondingly provided with a second air inlet channel and a second air outlet channel; the second-stage sealing device sequentially comprises a second baffle ring and a second positioning sleeve which are in interference fit with the static ring along the direction far away from the compression cavity, and the second baffle ring is tightly abutted against the first positioning sleeve; a second sliding ring and a second moving ring are in clearance fit with the outer wall of the second positioning sleeve, a groove is formed in the contact surface of the second moving ring and the second sliding ring, and an elastic part is installed in the groove; the outer wall of the second rotating ring is rotatably connected with the shell. By adopting the scheme, the second sealing gas is introduced to form a gas film in the gap of the second-stage sealing device, so that the leakage of the first sealing gas is effectively avoided.
Preferably, one end of the baffle ring, which is far away from the compression cavity, protrudes outwards to form a first fixing cavity, and the first fixing cavity is in interference fit with the first baffle ring; a second fixing cavity is formed in one end, far away from the compression cavity, of the first positioning sleeve, and the second fixing cavity is in interference fit with the second retaining ring; one end of the second positioning sleeve, which is far away from the compression cavity, protrudes towards the direction of the rotating shaft, and the protrusion is connected with the static ring axial screw.
Adopt above-mentioned scheme, be convenient for further fixed first sealing device and second sealing device, avoid sealing device to produce at the rotation in-process and quiet ring and present relative slip and produce the abnormal sound, or influence sealed effect because of increase seal chamber volume.
Preferably, the third-stage sealing device comprises a third positioning sleeve in interference fit with the rotating shaft and a third retaining ring in clearance fit with the outer wall of the third positioning sleeve, a sealing groove is formed in the clearance fit surface, a sealing ring is arranged in the interference fit of the outer wall of the third retaining ring, and the sealing ring is fixedly connected with the shell. By adopting the scheme, the third sealing gas quickly forms a gas film after entering the third-stage sealing device, and the outlet of the third sealing gas is directly communicated with the atmosphere, so that the recovery control procedure of the sealing gas is reduced, and the system control is simpler.
Preferably, a convex ring is formed inwards on the interference fit surface of the third positioning sleeve and the rotating shaft, a groove is formed at the position of the rotating shaft corresponding to the convex ring, and the convex ring and the groove are in interference fit to realize the fixation of the third positioning sleeve; the shell is kept away from compression chamber one end and is equipped with the recess, installs sealed lid in the recess, sealed lid contacts and axial screw connection with the sealing ring. By adopting the scheme, the third-stage sealing device is further fixed, so that the first-stage sealing device and the second-stage sealing device are tightly abutted and fixed; prevent various parts from generating axial sliding to generate abnormal sound or influence the sealing effect.
Preferably, a sealing cavity is arranged between a contact surface of the first fixed cavity and the first retaining ring, a contact surface of the second fixed cavity and the second retaining ring, a contact surface of the shell, the first movable ring, the second movable ring and the sealing ring, a contact surface of the third retaining ring and the sealing ring, and a contact surface of the rotating shaft, the stationary ring and the third positioning sleeve, and a sealing ring is arranged in the sealing cavity. By adopting the scheme, the flow channels of the synthesis gas and the seal gas are further limited, and the sealing grade is improved.
Preferably, one end of the second movable ring, which is close to the compression cavity, is connected with a fourth positioning sleeve through a screw, and the fourth positioning sleeve is located outside the first positioning sleeve and is rotatably connected with the first positioning sleeve through a first sealing groove. By adopting the scheme, the channel volume of the second-stage sealing device is further reduced conveniently, and the using amount of sealing gas is reduced; meanwhile, the same sealing gas can be used for sealing the first-stage sealing device and the second-stage sealing device, so that the operation process of the sealer is simplified.
Drawings
Fig. 1 is a cross-sectional view of the entire rotating shaft center of embodiment 1 of the present invention.
Fig. 2 is a cross-sectional view of the entire rotating shaft center of embodiment 2 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the sealing structure comprises a rotating shaft 10, a stationary ring 11, a baffle ring 111, a housing 12, a first air inlet channel 121, a first air outlet channel 122, a second air inlet channel 123, a second air outlet channel 124, a third air inlet channel 125, a third air outlet channel 126, a first-stage sealing device 31, a first baffle ring 311, a first sliding ring 312, a first positioning sleeve 313, a first moving ring 314, a second-stage sealing device 32, a second baffle ring 321, a second sliding ring 322, a second positioning sleeve 323, a second moving ring 324, a third-stage sealing device 33, a third baffle ring 331, a third positioning sleeve 332, a sealing ring 333, a sealing cover 34 and a fourth positioning sleeve 35.
Example 1
This embodiment is substantially as shown in fig. 1: a dry gas sealing system of a synthesis gas compressor comprises a main body unit, a control unit, a ventilation unit and a sealing unit; the main part unit includes shell 12, is located the quiet ring 11 of shell, and quiet ring 11 and pivot 10 interference fit or through the key-type connection for pivot 10 can drive quiet ring 11 and rotate together. The sealing unit is located between the stationary ring 11 and the housing 12. The sealing unit comprises at least two stages of sealing devices, and specifically comprises three stages of sealing devices which are sequentially arranged in series from left to right as shown in fig. 1, wherein the series connection refers to that the sealing devices of each stage are mutually communicated through a sealing groove; the three-stage sealing devices are a first-stage sealing device 31, a second-stage sealing device 32 and a third-stage sealing device 33 in sequence along the direction away from the compression chamber (from left to right as shown in fig. 1) (for convenience of understanding, the areas of the first-stage sealing device 31, the second-stage sealing device 32 and the third-stage sealing device 33 are respectively marked by dashed boxes in fig. 1 for distinction); dry gas sealing channels are respectively arranged in the first-stage sealing device 31, the second-stage sealing device 32 and the third-stage sealing device 33, and the volume of the dry gas sealing channel of the first-stage sealing device 31 is larger than that of the dry gas sealing channel of the second-stage sealing device 32The volume of the dry gas seal channel of the second-stage sealing device 32 is larger than that of the dry gas seal channel of the third-stage sealing device 33, and the seal gas channel volume which is gradually reduced can effectively reduce the amount of seal gas which is blown into the synthesis gas, so that the influence on the use of the synthesis gas is reduced. The dry gas sealing channels of each stage of sealing device are correspondingly communicated with a group of radial through holes, specifically three groups in the embodiment; the radial through holes are all arranged on the shell 12; each group of radial through holes includes an air inlet channel and an air outlet channel, and in this embodiment, the first-stage sealing device 31 is correspondingly provided with a first air inlet channel 121 and a first air outlet channel 122, the second-stage sealing device 32 is correspondingly provided with a second air inlet channel 123 and a second air outlet channel 124, and the third-stage sealing device 33 is correspondingly provided with a third air inlet channel 125 and a third air outlet channel 126. Each air inlet channel is externally connected with a vent pipeline connected in parallel, the vent pipeline is provided with a control valve, all the control valves are in signal connection with a control unit, the control unit is specifically a PLC (programmable logic controller) (not shown in the figure), the embodiment is specifically that each air inlet channel is externally communicated with two pipelines connected in parallel, the two pipelines are respectively connected with air tanks with different sealing gases, and the air tanks with different sealing gases can control the control valves on the different pipelines to open different sealing gases into the dry gas sealing channel through the PLC; in the embodiment, the outside of each air outlet channel is connected with a storage tank through a pipeline, so that the sealing air in the dry air sealing channel can be conveniently and intensively stored; in this embodiment, two pipelines located outside the first air inlet channel 121 are respectively connected with air tanks filled with first seal air and third seal air, the pipelines are respectively provided with a first air inlet valve a and a first air inlet valve B, the pipelines outside the first air outlet channel 122 are respectively connected with a storage tank for the first seal air, and the pipelines are provided with first air outlet valves; the two pipelines outside the second air inlet channel 123 are respectively connected with air tanks filled with second sealing air and third sealing air, the pipelines are respectively provided with a second air inlet valve A and a second air inlet valve B, the pipeline outside the second air outlet channel 124 is connected with a storage tank for recovering the second sealing air, and the pipelines are provided with second air outlet valves; a gas tank filled with third sealing gas is connected to the pipeline positioned outside the third gas inlet channel 125, and a third gas inlet valve is arranged on the pipeline; wherein the first sealThe gas is synthetic gas, and the second seal gas is CO 2 And the third sealing gas is N 2 ，N 2 As a constituent of air, when N 2 When the sealing gas is used as the sealing gas, the sealing gas is not required to be recovered and can be directly discharged to the atmosphere; and is also provided with a CO connected with the PLC signal 2 Detection means for detecting CO of the plant 2 Not exceeding standard, CO 2 Can be directly discharged as sealing gas without recovery.
The first-stage sealing device 31 sequentially comprises a first retaining ring 311 and a first positioning sleeve 313 which are in interference fit with the static ring 11 along the direction far away from the compression cavity, and the left end face of the first retaining ring 311 is tightly abutted to the retaining ring 111; a first sliding ring 312 and a first moving ring 314 are arranged outside the first positioning sleeve 313 in a clearance fit manner, a groove is formed in the contact surface of the first moving ring 314 and the first sliding ring 312, an elastic part is arranged in the groove, the elastic part is specifically matched with a spring sheet in the embodiment, the spring sheet is in contact with the first moving ring 314, and the spring is fixed between the spring sheet and the first sliding ring 312; the outer wall of the first rotating ring 314 is in interference fit with the housing 12.
The second-stage sealing device 32 sequentially comprises a second baffle ring 321 and a second positioning sleeve 323 which are in interference fit with the static ring 11 along the direction far away from the compression cavity, and the left end face of the second baffle ring 321 is tightly abutted to the first positioning sleeve 313; the outer wall of the second positioning sleeve 323 is in clearance fit with a second slip ring 322 and a second moving ring 324, a groove is formed in a contact surface of the second moving ring 324 and the second slip ring 322, an elastic part is installed in the groove, the elastic part is specifically matched with a spring in the embodiment, the spring is in contact with the second moving ring 324, and the spring is fixed between the spring and the second slip ring 322; the outer wall of the second rotating ring 324 is in interference fit with the housing 12.
One end of the second movable ring 324, which is close to the compression cavity, is connected with a fourth positioning sleeve 35 through a screw, the fourth positioning sleeve 35 is located between the first positioning sleeve 313 and the housing 12, the outer wall of the fourth positioning sleeve 35 is in interference fit with the housing 12, and the inner wall of the fourth positioning sleeve 35 is rotatably connected with the first positioning sleeve 313 through a first sealing groove. The fourth positioning sleeve 35 further reduces the volume of the dry gas sealing channel of the second-stage sealing device 32, and reduces the using amount of sealing gas; meanwhile, the same sealing gas can be used for sealing the first-stage sealing device 31 and the second-stage sealing device 32, so that the operation process of the dry gas sealing system is simplified.
The third-stage sealing device 33 comprises a third positioning sleeve 332 in interference fit with the rotating shaft 10 and a third retaining ring 331 in clearance fit with the outer wall of the third positioning sleeve 332, a second sealing groove and a third sealing groove are arranged on a clearance fit surface, a third sealing groove far away from the compression cavity forms a third air outlet channel 126, and the third air outlet channel 126 is directly communicated with the outside air; a convex ring is formed in the third positioning sleeve 332 and the rotating shaft 10 in an interference fit surface, a groove is formed at the position of the rotating shaft 10 corresponding to the convex ring, and the convex ring and the groove are in interference fit to realize the fixation of the third positioning sleeve 332; one end of the third positioning sleeve 332 close to the compression cavity is tightly abutted against the second positioning sleeve 323, so that the first-stage sealing device 31 and the second-stage sealing device 32 are conveniently abutted and fixed; a sealing ring 333 is in interference fit with the outer wall of the third retaining ring 331, and a sealing cavity and a sealing ring are arranged on the interference fit surface; the sealing ring 333 is fixedly connected with the inner wall of the housing 12. As shown in fig. 1, a groove is formed at an end of the casing 12 away from the compression chamber, a sealing cover 34 is installed in the groove, and the sealing cover 34 is tightly pressed against the sealing ring 333 and axially screwed.
In this embodiment, all the parts contacting the rotating shaft 10, the stationary ring 11 and the housing 12 are provided with a sealing cavity between the contact surfaces, and a sealing ring is installed in the sealing cavity, so that the sealing effect of the sealing unit is further enhanced.
The specific implementation process of this embodiment is as follows: a dry gas sealing system is arranged outside a rotating shaft 10 between two ends of a main body of the synthesis gas compressor and a bearing; the installation sequence is that the stationary ring 11, the casing 12, the first-stage sealing device 31, the second-stage sealing device 32, the third-stage sealing device 33, and the seal cover 34 are installed in this order in a direction away from the compression chamber (in a direction from left to right as viewed in fig. 1).
When the synthesis gas compressor is in a closed state, the PLC controls the first air inlet valve A to be opened, and N is introduced into a dry gas sealing channel of the first air inlet device 31 2 ，N 2 Pushes the first slide ring 312 open, so that the passage between the first slide ring 312 and the first stopper ring 311 is opened, N 2 Then continuously flows forwards along the dry gas sealing channel, and N in the process 2 Forming a gas film in the dry gas seal channel, and following N 2 Continuously introducing N 2 Purging the instrument to effectively maintainCleaning of the apparatus, N introduced into a dry gas-tight channel 2 And is discharged from third gas outlet channel 126. When all the dry gas sealing channels are filled with N 2 And starting a synthesis gas compressor, introducing the synthesis gas into the synthesis gas compressor, and starting the compression of the synthesis gas. Then the PLC controller respectively controls the first air inlet valve A to close, simultaneously controls the first air inlet valve B and the third air inlet valve to open, and feeds synthetic gas into the dry gas sealing channel of the first-stage sealing device 31 and feeds N into the dry gas sealing channel of the third-stage sealing device 33 2 (ii) a The synthesis gas is replaced by the seal gas after entering the dry gas seal channel, so that N is avoided 2 As sealing gas N 2 Blow-by into the syngas affects the use of the syngas.
The three-stage sealing device arranged in series can fully seal the synthetic gas, and the second-stage sealing device 32 and the third-stage sealing device 33 can be used as standby sealing devices of the first sealing device 31, so that when the first-stage sealing device 31 fails, the second-stage sealing device 32 or the third-stage sealing device 33 can still fully seal the synthetic gas. Specifically, when the first-stage sealing device 31 has a fault, the PLC controls the second air inlet valve A to be opened, and CO is introduced into a dry gas sealing channel of the second-stage sealing device 32 2 ，CO 2 And the gas flows into the dry gas sealing channels of the first stage sealing device 31 and the third stage sealing device 33 and forms a gas film, so that the synthesis gas is sealed. When CO is present 2 The detection device detects CO of the plant 2 When not exceeding standard, CO 2 Can be directly discharged when being used as sealing gas, and does not need to be recycled; when CO is present 2 The detection device detects CO of the plant 2 When the pressure exceeds the standard, a signal is sent to the PLC controller, and the PLC controller can control the second air outlet valve and the third air inlet valve to be opened to seal CO in the channel with the dry gas 2 Drainage is recovered into a storage tank to avoid CO 2 The overproof discharge affects the environment; simultaneously, N is introduced into the dry gas sealing channel of the third stage sealing device 33 2 ，N 2 Diffuse into the secondary seal 32 and form a gas film that substantially seals the syngas and CO 2 。
Example 2
In order to further fix the first-stage sealing device 31 and the second-stage sealing device 32, the present embodiment is different from embodiment 1 in that, as shown in fig. 2, one end of the baffle ring 111 away from the compression cavity protrudes outward to form a first fixing cavity, and the first fixing cavity is in interference fit with the first baffle ring 311; a second fixing cavity is formed in one end, far away from the compression cavity, of the first positioning sleeve 313, and is in interference fit with the second retaining ring 321; one end of the second positioning sleeve 323 far away from the compression cavity is protruded towards the direction of the rotating shaft 10, and the protrusion is axially connected with the static ring 11 through a screw.
In this embodiment, the first-stage sealing device 31 and the second-stage sealing device 32 can be further fixed, so as to prevent the sealing devices from generating abnormal noise due to relative sliding with the stationary ring 11 in the rotating process, or prevent the sealing effect from being influenced due to the increase of the volume of the sealing cavity.
The above description is only an example of the present invention, and the detailed technical solutions and/or characteristics known in the solutions are not described too much here. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a dry gas seal system of synthetic gas compressor which characterized in that: comprises a ventilation unit and a sealing unit; the sealing unit comprises at least two stages of sealing devices; the sealing devices are respectively and correspondingly provided with a group of air inlet channels and air outlet channels; the air inlet channel and the air outlet channel are connected with the ventilation unit through pipelines; and the pipeline outside the air inlet channel is connected with a ventilation pipeline in parallel.
2. The dry gas seal system of a syngas compressor of claim 1, wherein: the sealing device comprises a main body unit and a control unit, wherein the main body unit comprises a static ring in interference fit with a rotating shaft and a shell in clearance fit with the rotating shaft, the shell is positioned outside the static ring, and the sealing unit is rotatably connected between the static ring and the shell; the shell is provided with a plurality of groups of radial through holes, the radial through holes are air inlet channels and air outlet channels, each air inlet channel and each air outlet channel are externally connected with a ventilation pipeline connected in parallel, the ventilation pipelines are provided with control valves, and all the control valves are in signal connection with the control unit.
3. The dry gas seal system of a syngas compressor of claim 2, wherein: the sealing unit comprises three sealing devices which are connected in series, the three sealing devices are sequentially a first sealing device, a second sealing device and a third sealing device along the direction of keeping away from the compression cavity, the dry gas sealing channel volume of the first sealing device is larger than that of the second sealing device, and the dry gas sealing channel volume of the second sealing device is larger than that of the third sealing device.
4. The dry gas seal system of a syngas compressor of claim 3, wherein: the first-stage sealing device is correspondingly provided with a first air inlet channel and a first air outlet channel; one side of the static ring, which is close to the compression cavity, protrudes radially to form a baffle ring, the first-stage sealing device sequentially comprises a first baffle ring and a first positioning sleeve which are in interference fit with the static ring along the direction far away from the compression cavity, and the first baffle ring is tightly abutted to the baffle ring; a first sliding ring and a first moving ring are arranged outside the first positioning sleeve in a clearance fit mode, a groove is formed in the contact surface of the first moving ring and the first sliding ring, and an elastic part is arranged in the groove; the outer wall of the first rotating ring is rotatably connected with the shell.
5. The dry gas seal system of a syngas compressor of claim 4, wherein: the second-stage sealing device is correspondingly provided with a second air inlet channel and a second air outlet channel; the second-stage sealing device sequentially comprises a second baffle ring and a second positioning sleeve which are in interference fit with the static ring along the direction far away from the compression cavity, and the second baffle ring is tightly abutted against the first positioning sleeve; a second sliding ring and a second moving ring are in clearance fit with the outer wall of the second positioning sleeve, a groove is formed in the contact surface of the second moving ring and the second sliding ring, and an elastic part is installed in the groove; the outer wall of the second rotating ring is rotatably connected with the shell.
6. The dry gas seal system of a syngas compressor of claim 5, wherein: one end of the baffle ring, which is far away from the compression cavity, protrudes outwards to form a first fixing cavity, and the first fixing cavity is in interference fit with the first baffle ring; a second fixing cavity is formed in one end, far away from the compression cavity, of the first positioning sleeve, and the second fixing cavity is in interference fit with the second retaining ring; one end of the second positioning sleeve, which is far away from the compression cavity, is protruded towards the direction of the rotating shaft, and the protrusion is connected with the static ring by an axial screw.
7. The dry gas seal system of a syngas compressor of claim 6, wherein: the third-stage sealing device comprises a third positioning sleeve in interference fit with the rotating shaft and a third retaining ring in clearance fit with the outer wall of the third positioning sleeve, a sealing groove is formed in the clearance fit surface, a sealing ring is in interference fit with the outer wall of the third retaining ring, and the sealing ring is fixedly connected with the shell.
8. The dry gas seal system of a syngas compressor of claim 7, wherein: a convex ring is formed inwards on the interference fit surface of the third positioning sleeve and the rotating shaft, a groove is formed at the position of the rotating shaft corresponding to the convex ring, and the convex ring and the groove are in interference fit to realize the fixation of the third positioning sleeve; the shell is kept away from compression chamber one end and is equipped with the recess, installs sealed lid in the recess, sealed lid contacts and axial screw connection with the sealing ring.
9. The dry gas seal system of a syngas compressor of claim 8, wherein: the contact surface of the first fixed cavity and the first baffle ring, the contact surface of the second fixed cavity and the second baffle ring, the contact surfaces of the shell, the first movable ring, the second movable ring and the sealing ring, the contact surfaces of the third baffle ring and the sealing ring, and the contact surfaces of the rotating shaft, the static ring and the third positioning sleeve are all provided with a sealing cavity, and a sealing ring is arranged in the sealing cavity.
10. The dry gas seal system of a synthesis gas compressor according to claim 9, wherein: one end of the second movable ring, which is close to the compression cavity, is in screwed connection with a fourth positioning sleeve, and the fourth positioning sleeve is positioned outside the first positioning sleeve and is rotationally connected with the first positioning sleeve through a first sealing groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220578424.6U CN217130339U (en) | 2022-03-16 | 2022-03-16 | Dry gas sealing system of synthesis gas compressor |
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| CN202220578424.6U CN217130339U (en) | 2022-03-16 | 2022-03-16 | Dry gas sealing system of synthesis gas compressor |
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| CN (1) | CN217130339U (en) |
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2022
- 2022-03-16 CN CN202220578424.6U patent/CN217130339U/en active Active
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