CN111502776A - Nitrogen sealing system and method for turboexpander with stator blade adjusting cavity seal - Google Patents
Nitrogen sealing system and method for turboexpander with stator blade adjusting cavity seal Download PDFInfo
- Publication number
- CN111502776A CN111502776A CN202010348678.4A CN202010348678A CN111502776A CN 111502776 A CN111502776 A CN 111502776A CN 202010348678 A CN202010348678 A CN 202010348678A CN 111502776 A CN111502776 A CN 111502776A
- Authority
- CN
- China
- Prior art keywords
- sealing
- pipeline
- nitrogen
- air inlet
- blade adjusting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 233
- 238000007789 sealing Methods 0.000 title claims abstract description 166
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 76
- 230000003068 static effect Effects 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 60
- 230000001105 regulatory effect Effects 0.000 claims description 49
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 7
- 238000011897 real-time detection Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/005—Sealing means between non relatively rotating elements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention provides a nitrogen sealing system and a nitrogen sealing method for a turboexpander with a stator blade adjusting cavity seal, which comprises a main pipeline, a stator blade adjusting cavity A sealing pipeline, a stator blade adjusting cavity B sealing pipeline, an air inlet side sealing pipeline and an air outlet side sealing pipeline, wherein the stator blade adjusting cavity A sealing pipeline is connected with the main pipeline through a pipeline; the method adopts nitrogen to jointly seal a stationary blade adjusting cavity, an air inlet side nitrogen charging port and an air outlet side nitrogen charging port of the turbo expander. The gas leakage during the operation of the turboexpander can be further ensured, so that operators can safely operate on the spot, and meanwhile, the environmental pollution can be avoided. A sealing cavity is arranged between the static blade bearing cylinder of the turboexpander and the shell, and the leakage of coal gas to the adjusting cavity can be avoided by adding nitrogen sealing. The cleanliness of the stator blade adjusting cavity can be ensured, the problems of increased friction force of a stator blade crank and difficult rotation of the stator blade caused by gas leakage can be avoided, and the service life of the stator blade adjusting mechanism can be ensured and prolonged. The problems of static blade adjusting clamping stagnation and asynchronization of the two sides of the static blade adjusting oil cylinders can be solved.
Description
Technical Field
The invention belongs to the field of metallurgy, relates to a turboexpander, and particularly relates to a nitrogen sealing system and method for a turboexpander with a stator blade adjusting cavity seal.
Background
In the metallurgical industry, blast furnace gas generated by blast furnace iron making firstly passes through dust removing equipment and then passes through a pressure reducing valve group to be supplied to users, and the original pressure energy and heat energy in the blast furnace gas are greatly wasted. In order to recover the energy lost in the blast furnace gas, it is necessary to increase a blast furnace gas top pressure turbine power generation unit (TRT). In dry and wet dust removal TRT, dry and wet dual-purpose TRT, shared TRT, blast furnace blast and energy recovery unit (BPRT) and sintering waste heat and blast furnace top pressure energy recovery combined generator Set (STRT), a turbine expander is used, and the TRT is a necessary device for blast furnace energy conservation and environmental protection.
Some nitrogen sealing systems are disclosed in the prior art, for example, a carbon ring seal is disposed outside the gas seal; the carbon ring sealing body and the gas sealing body are both provided with nitrogen interfaces, and the plurality of carbon rings are respectively arranged at the contact positions of the carbon ring sealing body and the turbine rotor; the nitrogen connecting pipe is connected with a nitrogen interface; the nitrogen connecting pipe is connected with a check valve, and the check valve is connected with a stop valve; the stop valve is connected with the ball valve; the inlet end of the ball valve is connected with the air outlet of the pneumatic membrane regulating valve; the air inlet of the pneumatic membrane regulating valve is connected with the outlet end of the ball valve; the inlet end of the ball valve is connected with the air outlet of the check valve; the inlet of the check valve is filled with nitrogen.
The sealing system in the prior art solves the problem of outward leakage of the gas of the blast furnace gas turbine set to a certain extent, ensures the environmental safety, but does not fully consider the equipment safety problem caused by the leakage in the equipment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a nitrogen sealing system and a nitrogen sealing method for a turboexpander with a stator blade adjusting cavity seal, which prevent gas from leaking to the stator blade adjusting cavity through a stator blade bearing gap and polluting the adjusting cavity and solve the technical problem of dead locking of the stator blade adjusting or fracture of the adjusting plate caused by the pollution of the adjusting cavity in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a nitrogen sealing system with a stator blade adjusting cavity seal for a turboexpander comprises a turboexpander, wherein a stator blade adjusting cavity nitrogen charging port, an air inlet side carbon ring sealing nitrogen charging port, an air inlet side labyrinth nitrogen charging port, an exhaust side carbon ring sealing nitrogen charging port and an exhaust side labyrinth nitrogen charging port are arranged on the turboexpander;
the device also comprises a main pipeline, a stator blade adjusting cavity A sealing pipeline, a stator blade adjusting cavity B sealing pipeline, an air inlet side carbon ring sealing pipeline, an air inlet side labyrinth sealing pipeline, an exhaust side carbon ring sealing pipeline and an exhaust side labyrinth sealing pipeline;
the gas outlet end of the sealing pipeline of the static blade adjusting cavity A is communicated with a nitrogen charging port of the static blade adjusting cavity, the gas outlet end of the sealing pipeline of the static blade adjusting cavity B is communicated with the nitrogen charging port of the static blade adjusting cavity, the gas outlet end of the carbon ring sealing pipeline of the gas inlet side is communicated with the carbon ring sealing nitrogen charging port of the gas inlet side, the gas outlet end of the labyrinth sealing pipeline of the gas inlet side is communicated with the labyrinth sealing nitrogen charging port of the gas inlet side, the gas outlet end of the carbon ring sealing pipeline of the gas outlet side is communicated with the carbon ring sealing nitrogen charging port of the gas outlet side, and the gas outlet end of the labyrinth sealing pipeline of the;
the main pipeline is provided with a pneumatic membrane regulating valve, the main pipeline at the air inlet end of the pneumatic membrane regulating valve is a main pipeline air inlet section, and the main pipeline at the air outlet end of the pneumatic membrane regulating valve is a main pipeline air outlet section;
the main pipeline air outlet section is respectively communicated with an air inlet end of a static blade adjusting cavity A sealing pipeline, an air inlet end of an air inlet side carbon ring sealing pipeline, an air inlet end of an air inlet side labyrinth sealing pipeline, an air inlet end of an exhaust side carbon ring sealing pipeline and an air inlet end of an exhaust side labyrinth sealing pipeline; the main pipeline air inlet section is communicated with the air inlet end of the static blade adjusting cavity B sealing pipeline.
The invention also has the following technical characteristics:
and a first stop valve is arranged on the main pipeline air inlet section at the upstream of the air inlet end of the static blade adjusting cavity B sealing pipeline.
A second stop valve is arranged on the static blade adjusting cavity A sealed pipeline; a third stop valve is arranged on the sealing pipeline of the static blade adjusting cavity B; a fourth stop valve and a first check valve are sequentially arranged on the air inlet side carbon ring sealing pipeline from the air inlet end to the air outlet end; a fifth stop valve and a second check valve are sequentially arranged on the air inlet side labyrinth seal pipeline from the air inlet end to the air outlet end; a sixth stop valve and a third check valve are sequentially arranged on the exhaust side carbon ring sealing pipeline from the air inlet end to the air outlet end; and a seventh stop valve and a fourth check valve are sequentially arranged on the exhaust side labyrinth seal pipeline from the air inlet end to the air outlet end.
The pneumatic membrane regulating valve on be provided with three valves protection mechanism, three valves protection mechanism including setting up the first ball valve at pneumatic membrane regulating valve inlet end, set up the second ball valve at pneumatic membrane regulating valve end of giving vent to anger, still include the third ball valve parallelly connected with pneumatic membrane regulating valve, the inlet end of first ball valve links to each other with the inlet end of third ball valve, the end of giving vent to anger of second ball valve links to each other with the end of giving vent to anger of third ball valve.
The turbo expander is a cast shell type turbo expander.
The invention also discloses a nitrogen sealing method for the turboexpander with the stator blade adjusting cavity seal, which is characterized in that the method adopts the nitrogen sealing system for the turboexpander with the stator blade adjusting cavity seal to carry out nitrogen charging and sealing on the stator blade adjusting cavity, the air inlet side carbon ring seal, the air inlet side labyrinth seal, the air outlet side carbon ring seal and the air outlet side labyrinth seal of the turboexpander.
Specifically, in the method, the pressure behind the regulating valve is 0.4-0.6 MPa; keeping the pressure behind the regulating valve to be 20-30 kPa higher than the pressure of the sealed coal gas, regulating the pneumatic film regulating valve in real time according to the real-time detection value of the pressure behind the regulating valve and the pressure of the sealed coal gas, and conveying the nitrogen regulated by the pneumatic film regulating valve to the stationary blade regulating cavity nitrogen charging port, the air inlet side carbon ring sealing nitrogen charging port, the air inlet side labyrinth sealing nitrogen charging port, the air outlet side carbon ring sealing nitrogen charging port and the air outlet side labyrinth sealing nitrogen charging port for sealing.
Specifically, the pressure behind the regulating valve is the pressure of nitrogen collected by taking the gas outlet section of the main pipe as a collecting point; the sealed gas pressure is the gas pressure collected by taking the exhaust pipeline on the exhaust side of the turboexpander or the balance pipeline of the turboexpander as a collection point.
Preferably, when the pressure in the stator blade adjusting cavity is less than 50kPa, the stator blade adjusting cavity A sealing pipeline is adopted to seal the stator blade adjusting cavity, and the stator blade adjusting cavity B sealing pipeline is closed; when the pressure in the stator blade adjusting cavity is larger than or equal to 50kPa, the stator blade adjusting cavity B sealing pipeline is adopted to seal the stator blade adjusting cavity, and the stator blade adjusting cavity A sealing pipeline is closed.
Compared with the prior art, the invention has the following technical effects:
the invention adopts nitrogen gas to carry out combined sealing on the stationary blade adjusting cavity, the air inlet side nitrogen charging port and the exhaust side nitrogen charging port of the turboexpander, can further ensure that coal gas is not leaked during the operation of the turboexpander, ensures the safe operation of operators on site, and can simultaneously avoid environmental pollution.
The invention adopts nitrogen to seal the static blade adjusting cavity of the turbine expander for the first time. The nitrogen seal is arranged in the stator blade adjusting cavity, so that the following effects can be brought:
a sealing cavity is arranged between the static blade bearing cylinder of the turboexpander and the shell, and the leakage of coal gas to the adjusting cavity can be avoided by adding nitrogen sealing.
The cleanliness of the stator blade adjusting cavity can be ensured, the problems of increased friction force of a stator blade crank and difficult rotation of the stator blade caused by gas leakage can be avoided, and the service life of the stator blade adjusting mechanism can be ensured and prolonged.
The problems of static blade adjusting clamping stagnation and asynchronization of the two sides of the static blade adjusting oil cylinders can be solved.
Through the design of the nitrogen sealing system of the stator blade adjusting cavity, the operation environment in the stator blade adjusting cavity of the turboexpander can be effectively optimized, and the service lives of the stator blade, the adjusting mechanism and the sealing ring of the turboexpander are effectively guaranteed and prolonged.
(III) under the condition that gas is not leaked, the nitrogen seal of the adjusting cavity adopts two sealed pipelines, nitrogen is consumed according to the actual pressure of the static blade adjusting cavity, and the nitrogen consumption is greatly saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the nitrogen sealing system.
The meaning of the individual reference symbols in the figures is: 1-a turboexpander, 2-a main pipeline, 3-a stator vane adjusting cavity A sealing pipeline, 4-a stator vane adjusting cavity B sealing pipeline, 5-an inlet side carbon ring sealing pipeline, 6-an inlet side labyrinth sealing pipeline, 7-an exhaust side carbon ring sealing pipeline, 8-an exhaust side labyrinth sealing pipeline, 9-a pneumatic membrane regulating valve, 10-a first stop valve, 11-a second stop valve, 12-a third stop valve, 13-a fourth stop valve, 14-a first check valve, 15-a fifth stop valve, 16-a second check valve, 17-a sixth stop valve, 18-a third check valve, 19-a seventh stop valve, 20-a fourth check valve, 21-a first ball valve, 22-a second ball valve, 23-a third ball valve, 24-a pressure sensor, 25-a flow sensor, 26-a temperature sensor, 27-a pressure gauge, 28-a pressure gauge, 29-a pressure difference transmitter, 30-a first pressure leading pipe, 31-a second pressure leading pipe, 32-an isolator, 33-a controller and 34-a valve self-contained positioner;
101-a nitrogen charging port of a stationary blade adjusting cavity, 102-a nitrogen charging port of a gas inlet side carbon ring seal, 103-a nitrogen charging port of a gas inlet side labyrinth seal, 104-a nitrogen charging port of an exhaust side carbon ring seal and 105-a nitrogen charging port of an exhaust side labyrinth seal;
201-a main pipeline gas inlet section, 202-a main pipeline gas outlet section;
p1 is the sealed gas pressure collection point, P2 is the pressure collection point after the regulating valve.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The turbo-expander in the present invention is mainly a blast furnace gas turbo-expander. The working medium of the blast furnace gas turbine expansion machine is blast furnace gas, and belongs to combustible toxic gas. In order to prevent gas leakage, a nitrogen sealing system is required to be arranged besides a labyrinth + end face carbon ring sealing mode, and the nitrogen sealing system can effectively prevent gas leakage at the TRT shaft end, the static blade adjusting cavity and other parts.
The TRT device is a device which utilizes the pressure energy and the heat energy of the byproduct of blast furnace smelting, namely blast furnace top gas, to ensure that the gas is expanded through a turbine expander to do work, and drives a generator to generate electricity or other equipment to recover energy. The TRT device does not consume any fuel, does not change the quality of raw gas, is the most economical equipment without pollution and public hazard, and can replace a pressure reducing valve bank to regulate and stabilize the top pressure of the furnace. The TRT working medium is blast furnace gas, belongs to combustible toxic gas and can not be leaked outside absolutely, so a nitrogen sealing system is needed to realize the sealing of the shaft end and the adjusting cavity. The shaft end sealing adopts a labyrinth type and end face carbon ring sealing type, and nitrogen sealing is added, so that the operation safety is improved.
All parts in the present invention are those known in the art, unless otherwise specified.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a nitrogen sealing system with a stator blade adjusting cavity seal for a turboexpander, which comprises a turboexpander 1, wherein the turboexpander 1 is provided with a stator blade adjusting cavity nitrogen charging port 101, an air inlet side carbon ring seal nitrogen charging port 102, an air inlet side labyrinth seal nitrogen charging port 103, an exhaust side carbon ring seal nitrogen charging port 104 and an exhaust side labyrinth seal nitrogen charging port 105;
the device also comprises a main pipeline 2, a stator blade adjusting cavity A sealing pipeline 3, a stator blade adjusting cavity B sealing pipeline 4, an air inlet side carbon ring sealing pipeline 5, an air inlet side labyrinth sealing pipeline 6, an exhaust side carbon ring sealing pipeline 7 and an exhaust side labyrinth sealing pipeline 8;
the air outlet end of the static blade adjusting cavity A sealing pipeline 3 is communicated with a static blade adjusting cavity nitrogen charging port 101, the air outlet end of the static blade adjusting cavity B sealing pipeline 4 is communicated with the static blade adjusting cavity nitrogen charging port 101, the air outlet end of the air inlet side carbon ring sealing pipeline 5 is communicated with an air inlet side carbon ring sealing nitrogen charging port 102, the air outlet end of the air inlet side labyrinth sealing pipeline 6 is communicated with an air inlet side labyrinth sealing nitrogen charging port 103, the air outlet end of the air outlet side carbon ring sealing pipeline 7 is communicated with an air outlet side carbon ring sealing nitrogen charging port 104, and the air outlet end of the air outlet side labyrinth sealing pipeline 8 is communicated with an air outlet side labyrinth sealing nitrogen charging port 105;
a pneumatic membrane regulating valve 9 is arranged on the main pipeline, a main pipeline 2 at the air inlet end of the pneumatic membrane regulating valve 9 is a main pipeline air inlet section 201, and a main pipeline 2 at the air outlet end of the pneumatic membrane regulating valve 9 is a main pipeline air outlet section 202;
the main pipeline gas outlet section 202 is respectively communicated with the gas inlet end of the static blade adjusting cavity A sealing pipeline 3, the gas inlet end of the gas inlet side carbon ring sealing pipeline 5, the gas inlet end of the gas inlet side labyrinth sealing pipeline 6, the gas inlet end of the gas exhaust side carbon ring sealing pipeline 7 and the gas inlet end of the gas exhaust side labyrinth sealing pipeline 8; the main pipeline air inlet section 201 is communicated with the air inlet end of the static blade adjusting cavity B sealing pipeline 4.
As a preferable scheme of the present embodiment, a first stop valve 10 is arranged on the main pipeline intake section 201 upstream of the intake end of the stationary blade adjusting cavity B sealing pipeline 4, and a pressure sensor 24, a flow sensor 25 and a temperature sensor 26 are further mounted on the main pipeline intake section 201 connected with the intake end of the first stop valve 10; a pressure gauge 27 is also arranged on the main pipeline gas inlet section 201 connected with the gas outlet end of the first stop valve 10; pressure gauges 28 are mounted on the stationary blade adjusting cavity nitrogen charging port 101, the air inlet side carbon ring sealing nitrogen charging port 102, the air inlet side labyrinth sealing nitrogen charging port 103, the exhaust side carbon ring sealing nitrogen charging port 104 and the exhaust side labyrinth sealing nitrogen charging port 105. The flow sensor 25 can take nitrogen consumption measurements and communicate to the central control room. Preferably, the pressure sensor 24 is a pressure gauge capable of displaying nitrogen pressure on site and transmitting a signal to the control center, and the flow sensor 25 is a flow sensor capable of displaying nitrogen flow on site and transmitting a signal to the control center. The temperature sensor 26 is a temperature sensor capable of displaying the temperature of the nitrogen gas on site and transmitting a signal to a control center. The pressure gauge 27 and the pressure gauge 28 are pressure indicators capable of displaying the pressure of nitrogen only on site.
In this embodiment, when the air source pressure at the air inlet end of the main pipeline is too high, a known pressure adjusting mechanism may be arranged at the nitrogen main pipeline for pressure adjustment.
As a preferable scheme of the embodiment, a second stop valve 11 is arranged on the static blade adjusting cavity a sealing pipeline 3; a third stop valve 12 is arranged on the static blade adjusting cavity B sealing pipeline 4; a fourth stop valve 13 and a first check valve 14 are sequentially arranged on the air inlet side carbon ring sealing pipeline 5 from the air inlet end to the air outlet end; a fifth stop valve 15 and a second check valve 16 are sequentially arranged on the air inlet side labyrinth seal pipeline 6 from the air inlet end to the air outlet end; a sixth stop valve 17 and a third check valve 18 are sequentially arranged on the exhaust side carbon ring sealing pipeline 7 from the air inlet end to the air outlet end; a seventh stop valve 19 and a fourth check valve 20 are provided in this order from the air inlet end to the air outlet end on the exhaust side labyrinth seal pipe 8.
As a preferred scheme of this embodiment, the pneumatic membrane adjusting valve 9 is provided with a three-valve-group protection mechanism, the three-valve-group protection mechanism includes a first ball valve 21 disposed at an air inlet end of the pneumatic membrane adjusting valve 9, a second ball valve 22 disposed at an air outlet end of the pneumatic membrane adjusting valve 9, and a third ball valve 23 connected in parallel with the pneumatic membrane adjusting valve 9, an air inlet end of the first ball valve 21 is connected to an air inlet end of the third ball valve 23, and an air outlet end of the second ball valve 22 is connected to an air outlet end of the third ball valve 23. The three valve group protection mechanisms are arranged at the pneumatic film regulating valve, so that the pneumatic film regulating valve is convenient to overhaul, and the reliability of the system is improved.
As a preferable mode of the present embodiment, the turboexpander 1 is a cast casing type turboexpander.
Example 2:
in this embodiment, a method for sealing nitrogen for a turboexpander with a stator blade adjusting cavity seal is provided, in which a nitrogen charging seal system for a turboexpander with a stator blade adjusting cavity seal in embodiment 1 is used to perform nitrogen charging seal on a stator blade adjusting cavity, an intake side carbon ring seal, an intake side labyrinth seal, an exhaust side carbon ring seal, and an exhaust side labyrinth seal of a turboexpander.
Specifically, in the method, the pressure behind the regulating valve is 0.4-0.6 MPa; keeping the pressure behind the regulating valve higher than the pressure of the sealed coal gas by 20-30 kPa, regulating the pneumatic film regulating valve 9 in real time according to the real-time detection value of the pressure behind the regulating valve and the pressure of the sealed coal gas, and conveying the nitrogen regulated by the pneumatic film regulating valve 9 to the stationary blade regulating cavity nitrogen charging port 101, the air inlet side carbon ring sealing nitrogen charging port 102, the air inlet side labyrinth sealing nitrogen charging port 103, the air outlet side carbon ring sealing nitrogen charging port 104 and the air outlet side labyrinth sealing nitrogen charging port 105 for sealing.
As a preferable scheme of this embodiment, the pressure after the regulating valve is the pressure of the nitrogen collected by taking the manifold gas outlet section 202 as the collection point; the sealed gas pressure is the gas pressure collected by taking the exhaust pipe on the exhaust side of the turboexpander 1 or the balance pipe of the turboexpander 1 as a collection point.
As a preferable scheme of the present embodiment, when the pressure in the stationary blade adjusting cavity is less than 50kPa, the stationary blade adjusting cavity a sealing pipeline 3 is used to seal the stationary blade adjusting cavity, and the stationary blade adjusting cavity B sealing pipeline 4 is closed; when the pressure in the stator blade adjusting cavity is larger than or equal to 50kPa, the stator blade adjusting cavity B sealing pipeline 4 is adopted to seal the stator blade adjusting cavity, and the stator blade adjusting cavity A sealing pipeline 3 is closed.
As a preferable scheme of this embodiment, the adjustment of the pneumatic membrane adjusting valve 9 can be realized by an adjusting unit, the adjusting unit includes a pressure difference transmitter 29, one end of the pressure difference transmitter 29 is communicated with the sealed gas pressure collecting point P1 through a first pressure guiding pipe 30, and the other end of the pressure difference transmitter 29 is communicated with the adjusting valve rear pressure collecting point P2 through a second pressure guiding pipe 31. The pressure difference transmitter 29 is also connected with an isolator 32, a controller 33 and a valve self-contained positioner 34 through cables in turn, and the valve self-contained positioner 34 is connected with the pneumatic membrane regulating valve 9 and used for controlling and regulating the pneumatic membrane regulating valve 9.
Claims (9)
1. A nitrogen sealing system with a stator blade adjusting cavity seal for a turboexpander comprises a turboexpander (1) and is characterized in that a stator blade adjusting cavity nitrogen charging port (101), an air inlet side carbon ring sealing nitrogen charging port (102), an air inlet side labyrinth sealing nitrogen charging port (103), an exhaust side carbon ring sealing nitrogen charging port (104) and an exhaust side labyrinth sealing nitrogen charging port (105) are arranged on the turboexpander (1);
the device also comprises a main pipeline (2), a stator blade adjusting cavity A sealing pipeline (3), a stator blade adjusting cavity B sealing pipeline (4), an air inlet side carbon ring sealing pipeline (5), an air inlet side labyrinth sealing pipeline (6), an exhaust side carbon ring sealing pipeline (7) and an exhaust side labyrinth sealing pipeline (8);
the gas outlet end of the static blade adjusting cavity A sealing pipeline (3) is communicated with a static blade adjusting cavity nitrogen filling port (101), the gas outlet end of the static blade adjusting cavity B sealing pipeline (4) is communicated with the static blade adjusting cavity nitrogen filling port (101), the gas outlet end of the gas inlet side carbon ring sealing pipeline (5) is communicated with a gas inlet side carbon ring sealing nitrogen filling port (102), the gas outlet end of the gas inlet side labyrinth sealing pipeline (6) is communicated with a gas inlet side labyrinth sealing nitrogen filling port (103), the gas outlet end of the gas outlet side carbon ring sealing pipeline (7) is communicated with a gas outlet side carbon ring sealing nitrogen filling port (104), and the gas outlet end of the gas outlet side labyrinth sealing pipeline (8) is communicated with a gas outlet side labyrinth sealing nitrogen filling port (105);
the main pipeline is provided with a pneumatic film regulating valve (9), a main pipeline (2) at the air inlet end of the pneumatic film regulating valve (9) is a main pipeline air inlet section (201), and a main pipeline (2) at the air outlet end of the pneumatic film regulating valve (9) is a main pipeline air outlet section (202);
the main pipeline air outlet section (202) is respectively communicated with an air inlet end of the static blade adjusting cavity A sealing pipeline (3), an air inlet end of the air inlet side carbon ring sealing pipeline (5), an air inlet end of the air inlet side labyrinth sealing pipeline (6), an air inlet end of the exhaust side carbon ring sealing pipeline (7) and an air inlet end of the exhaust side labyrinth sealing pipeline (8); the main pipeline air inlet section (201) is communicated with the air inlet end of the static blade adjusting cavity B sealing pipeline (4).
2. The nitrogen sealing system for turboexpanders with vane regulation cavity seals as claimed in claim 1, characterized in that the first shut-off valve (10) is provided on the main line inlet section (201) upstream of the inlet end of the vane regulation cavity B seal line (4).
3. The nitrogen sealing system for the turboexpander with the vane regulation cavity seal as claimed in claim 1, wherein a second stop valve (11) is provided on the vane regulation cavity a seal line (3); a third stop valve (12) is arranged on the static blade adjusting cavity B sealing pipeline (4); a fourth stop valve (13) and a first check valve (14) are sequentially arranged on the air inlet side carbon ring sealing pipeline (5) from the air inlet end to the air outlet end; a fifth stop valve (15) and a second check valve (16) are sequentially arranged on the air inlet side labyrinth seal pipeline (6) from the air inlet end to the air outlet end; a sixth stop valve (17) and a third check valve (18) are sequentially arranged on the exhaust side carbon ring sealing pipeline (7) from the air inlet end to the air outlet end; and a seventh stop valve (19) and a fourth check valve (20) are sequentially arranged on the exhaust side labyrinth seal pipeline (8) from the air inlet end to the air outlet end.
4. The nitrogen sealing system for the turboexpander with the vane regulation cavity seal as claimed in claim 1, wherein the pneumatic diaphragm regulating valve (9) is provided with a three-valve-group protection mechanism, the three-valve-group protection mechanism comprises a first ball valve (21) arranged at the air inlet end of the pneumatic diaphragm regulating valve (9), a second ball valve (22) arranged at the air outlet end of the pneumatic diaphragm regulating valve (9), and a third ball valve (23) connected in parallel with the pneumatic diaphragm regulating valve (9), the air inlet end of the first ball valve (21) is connected with the air inlet end of the third ball valve (23), and the air outlet end of the second ball valve (22) is connected with the air outlet end of the third ball valve (23).
5. The nitrogen sealing system for a turboexpander with vane regulation cavity sealing as claimed in claim 1, characterized in that said turboexpander (1) is a cast-casing type turboexpander.
6. A method for sealing a nitrogen gas for a turbo-expander with a vane adjustment chamber seal, characterized in that the method employs the nitrogen gas sealing system for a turbo-expander with a vane adjustment chamber seal according to any one of claims 1 to 5 to perform nitrogen gas charging sealing on the vane adjustment chamber, the intake side carbon ring seal, the intake side labyrinth seal, the exhaust side carbon ring seal and the exhaust side labyrinth seal of the turbo-expander.
7. The method of sealing a nitrogen gas for a turboexpander having a vane regulation cavity seal according to claim 6, wherein the back pressure of the regulation valve is 0.4 to 0.6 MPa; keeping the pressure behind the regulating valve to be higher than the sealed gas pressure by 20-30 kPa, adjusting a pneumatic film regulating valve (9) in real time according to the real-time detection value of the pressure behind the regulating valve and the sealed gas pressure, and conveying nitrogen subjected to pressure adjustment by the pneumatic film regulating valve (9) to a stationary blade regulating cavity nitrogen charging port (101), an air inlet side carbon ring sealed nitrogen charging port (102), an air inlet side labyrinth sealed nitrogen charging port (103), an air outlet side carbon ring sealed nitrogen charging port (104) and an air outlet side labyrinth sealed nitrogen charging port (105) for sealing.
8. The method of nitrogen sealing for a turboexpander with vane tuning cavity sealing of claim 7, wherein the post-valve pressure is the nitrogen pressure collected at the collection point of the manifold outlet section (202); the sealed gas pressure is the gas pressure collected by taking an exhaust pipeline on the exhaust side of the turboexpander (1) or a balance pipeline of the turboexpander (1) as a collection point.
9. The method of sealing a nitrogen gas for a turbo expander with a vane regulation cavity seal according to claim 7, wherein when the pressure in the vane regulation cavity is less than 50kPa, the vane regulation cavity is sealed by the vane regulation cavity a seal line (3) and the vane regulation cavity B seal line (4) is closed; when the pressure in the stator blade adjusting cavity is larger than or equal to 50kPa, the stator blade adjusting cavity is sealed by the stator blade adjusting cavity B sealing pipeline (4), and the stator blade adjusting cavity A sealing pipeline (3) is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010348678.4A CN111502776A (en) | 2020-04-28 | 2020-04-28 | Nitrogen sealing system and method for turboexpander with stator blade adjusting cavity seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010348678.4A CN111502776A (en) | 2020-04-28 | 2020-04-28 | Nitrogen sealing system and method for turboexpander with stator blade adjusting cavity seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111502776A true CN111502776A (en) | 2020-08-07 |
Family
ID=71871479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010348678.4A Pending CN111502776A (en) | 2020-04-28 | 2020-04-28 | Nitrogen sealing system and method for turboexpander with stator blade adjusting cavity seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111502776A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374581A (en) * | 2021-07-08 | 2021-09-10 | 杭州杭氧膨胀机有限公司 | Sealing protection system of hydrogen turbine expansion generator |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1085386A (en) * | 1965-06-04 | 1967-09-27 | English Electric Co Ltd | Improvements in or relating to sealing arrangements for turbine shafts |
| GB2081386A (en) * | 1980-08-01 | 1982-02-17 | Nippon Steel Corp | System for generating power from the top pressure of blast furnaces |
| CN2924190Y (en) * | 2006-03-20 | 2007-07-18 | 陕西鼓风机（集团）有限公司 | Vane adjustable component seal protection structure for blast furnace gas turbine plant |
| CN201982146U (en) * | 2011-02-12 | 2011-09-21 | 宝山钢铁股份有限公司 | Turbine generator set cylinder |
| US20120043727A1 (en) * | 2009-03-10 | 2012-02-23 | Ludger Alfes | Shaft seal for a turbomachine |
| CN203175628U (en) * | 2013-03-06 | 2013-09-04 | 宝钢集团新疆八一钢铁有限公司 | Improved stationary blade bearing online cleaning and clamping-preventing device |
| US20140225325A1 (en) * | 2013-02-11 | 2014-08-14 | Dresser-Rand Company | Seal assembly for centrifugal compressors |
| CN204942545U (en) * | 2015-09-17 | 2016-01-06 | 河北钢铁股份有限公司邯郸分公司 | A kind of sealing carbocyclic ring of improvement |
| CN106593547A (en) * | 2016-12-27 | 2017-04-26 | 杭州杭氧膨胀机有限公司 | Sealing system of turbo expander |
| US20170335966A1 (en) * | 2014-12-18 | 2017-11-23 | Eagleburgmann Germany Gmbh & Co. Kg | Shaft seal arrangement for a fluid machine and method for sealing a shaft of a fluid machine |
| CN107654377A (en) * | 2017-09-28 | 2018-02-02 | 上海齐耀螺杆机械有限公司 | The gland seal device of oil free screw machine |
| CN212428957U (en) * | 2020-04-28 | 2021-01-29 | 西安陕鼓动力股份有限公司 | Nitrogen sealing system with stator blade adjusting cavity seal for turboexpander |
-
2020
- 2020-04-28 CN CN202010348678.4A patent/CN111502776A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1085386A (en) * | 1965-06-04 | 1967-09-27 | English Electric Co Ltd | Improvements in or relating to sealing arrangements for turbine shafts |
| GB2081386A (en) * | 1980-08-01 | 1982-02-17 | Nippon Steel Corp | System for generating power from the top pressure of blast furnaces |
| CN2924190Y (en) * | 2006-03-20 | 2007-07-18 | 陕西鼓风机（集团）有限公司 | Vane adjustable component seal protection structure for blast furnace gas turbine plant |
| US20120043727A1 (en) * | 2009-03-10 | 2012-02-23 | Ludger Alfes | Shaft seal for a turbomachine |
| CN201982146U (en) * | 2011-02-12 | 2011-09-21 | 宝山钢铁股份有限公司 | Turbine generator set cylinder |
| US20140225325A1 (en) * | 2013-02-11 | 2014-08-14 | Dresser-Rand Company | Seal assembly for centrifugal compressors |
| CN203175628U (en) * | 2013-03-06 | 2013-09-04 | 宝钢集团新疆八一钢铁有限公司 | Improved stationary blade bearing online cleaning and clamping-preventing device |
| US20170335966A1 (en) * | 2014-12-18 | 2017-11-23 | Eagleburgmann Germany Gmbh & Co. Kg | Shaft seal arrangement for a fluid machine and method for sealing a shaft of a fluid machine |
| CN204942545U (en) * | 2015-09-17 | 2016-01-06 | 河北钢铁股份有限公司邯郸分公司 | A kind of sealing carbocyclic ring of improvement |
| CN106593547A (en) * | 2016-12-27 | 2017-04-26 | 杭州杭氧膨胀机有限公司 | Sealing system of turbo expander |
| CN107654377A (en) * | 2017-09-28 | 2018-02-02 | 上海齐耀螺杆机械有限公司 | The gland seal device of oil free screw machine |
| CN212428957U (en) * | 2020-04-28 | 2021-01-29 | 西安陕鼓动力股份有限公司 | Nitrogen sealing system with stator blade adjusting cavity seal for turboexpander |
Non-Patent Citations (2)
| Title |
|---|
| 刘坤;唐效国;王馨薇;左庆爱;高智群;: "碳环密封在TRT中的应用实践", 莱钢科技, no. 01 * |
| 裴大海, 支刚林, 李媛: "高炉煤气余压透平(TRT)膨胀机轴端密封的应用与比较", 冶金动力, no. 03 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374581A (en) * | 2021-07-08 | 2021-09-10 | 杭州杭氧膨胀机有限公司 | Sealing protection system of hydrogen turbine expansion generator |
| CN113374581B (en) * | 2021-07-08 | 2022-09-06 | 杭州杭氧膨胀机有限公司 | Sealing protection system of hydrogen turbine expansion generator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102536431A (en) | Gasoline engine turbocharger | |
| CN212428957U (en) | Nitrogen sealing system with stator blade adjusting cavity seal for turboexpander | |
| CN209800100U (en) | sealing system for reducing oil leakage | |
| CN111502776A (en) | Nitrogen sealing system and method for turboexpander with stator blade adjusting cavity seal | |
| CN212428958U (en) | Nitrogen sealing system for turboexpander with bearing box cooling | |
| CN111502775A (en) | Nitrogen sealing system and method for turboexpander with bearing box cooling | |
| CN217300909U (en) | Air seal type screw compressor | |
| CN108019243A (en) | A kind of integral bearing A seating turbine | |
| CN202431358U (en) | Turbocharger of gasoline engine | |
| CN201568738U (en) | Seal gas recycling device of expansion machine | |
| CN211116764U (en) | Dry air sealing device for compressor | |
| CN105757455A (en) | Natural gas differential pressure energy recovery unit device | |
| CN102305105B (en) | Sealing structure of screw expander | |
| CN201723255U (en) | Assembled mechanical seal structure of screw rod expansion power machine | |
| CN101956571B (en) | Containerization type mechanical sealing structure of screw expansion power machine | |
| CN110848168A (en) | Dry air sealing device for compressor | |
| CN201007402Y (en) | Built-in type bidirectional rotating joint | |
| CN201982146U (en) | Turbine generator set cylinder | |
| Lisyanskii et al. | Practical experience with the introduction of honeycomb shroud seals on 250–800 MW supercritical pressure units | |
| CN217814971U (en) | Differential pressure control inflatable sealing structure of centrifugal ammonia gas compressor | |
| CN215486180U (en) | A prevent rotor shaft end lubricating oil extravasation device for TRT | |
| CN207485483U (en) | A kind of upper half cooling device of steam turbine High-and-medium Pressure Outer Casing | |
| CN211549786U (en) | Gas seal for spiral liquid shaft head of gas turbine | |
| CN212130859U (en) | Performance test platform for high-power engine cooling fan assembly | |
| CN204985771U (en) | Pneumatic fast tripe butterfly valve of opening |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |