CN116906128A - Shaft end reverse air seal device of blast furnace gas TRT turbine unit - Google Patents
Shaft end reverse air seal device of blast furnace gas TRT turbine unit Download PDFInfo
- Publication number
- CN116906128A CN116906128A CN202310978638.1A CN202310978638A CN116906128A CN 116906128 A CN116906128 A CN 116906128A CN 202310978638 A CN202310978638 A CN 202310978638A CN 116906128 A CN116906128 A CN 116906128A
- Authority
- CN
- China
- Prior art keywords
- gas
- axial flow
- shaft
- main shaft
- balance pipe
- 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
- 239000007789 gas Substances 0.000 description 32
- 238000007789 sealing Methods 0.000 description 22
- 239000003034 coal gas Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 244000126211 Hericium coralloides Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a shaft end reverse air seal device of a blast furnace gas TRT turbine unit, which comprises a rotor main shaft and stator blades, wherein the rotor main shaft and the stator blades are arranged in a machine shell, two sides of each stator blade respectively form a gas inlet channel and a gas outlet channel, small axial flow fans are respectively sleeved on the positions of shaft end air seals at two ends of the rotor main shaft, the axial flow fans are fixed on the rotor main shaft through shaft sleeves, the axial flow fans and the main shaft are concentric, after the rotor rotates, the axial flow fans are driven to rotate, the axial flow fans generate air flow opposite to the shaft seal discharge, the air pressure generated by the reverse air flow is used for preventing gas in a cylinder from leaking out of the gas through a shaft end air gap, a balance pipe is arranged between two side walls of the machine shell at the outer side of the axial flow fans, a gas balance valve is arranged on the balance pipe, and the upper part of the balance pipe is communicated with the middle part of the machine shell.
Description
Technical Field
The invention relates to a shaft end reverse air seal device of a blast furnace gas TRT turbine unit.
Background
In the blast furnace TRT turbine unit, gaps exist at dynamic and static positions when a rotor and a shell are arranged, so that high-pressure coal gas leaks and overflows through the shaft end gaps, potential safety hazards are caused, and energy waste is caused. In order to prevent the coal gas leakage at the shaft end, multistage gas seals and carbon ring seals are arranged at the shaft end, and the leakage of the coal gas is reduced through the depressurization of the gas seals and the blocking of the carbon rings; however, in practical application, due to reasons such as running wear and installation errors, shaft end gas leakage cannot be completely eradicated all the time, and sometimes serious gas overflow leakage occurs, so that the safety of equipment and personnel is seriously affected.
Aiming at the shaft end air seal sealing form and effect application, searching related patents and documents, and comparing and analyzing:
the Western An thermal institute Limited company applies for a patent 'an electromagnetic restraint type carbon dioxide turbine shaft end sealing device and method', and the sealing effect is realized by utilizing the electromagnetic restraint type carbon dioxide turbine shaft end sealing device and method and generating strong electric field ion current between sealing electrodes to form a concentrated magnetic field in a sealing cavity. The sealing form is suitable for sealing inert gas; for flammable and explosive gases such as coal gas and the like, related patents are not searched yet; it is also illustrated that the non-structural flexible seal form is practical for use in shaft end seals. However, the reverse sealing mode by using the axial flow fan has not been applied to the patent technology.
The research of the equivalent dynamic analysis method of hydrodynamic fingertip seal of paper written by Li Mengchen of the university of western An's technology is searched, wherein the theory is that for non-contact seal, the method is suitable for seal occasions with higher requirements on rotating speed and service life, but through years of development, the research is still quite deficient due to the complexity of the seal structure and working condition, and especially the domestic research is still blank.
Disclosure of Invention
The invention aims to provide a shaft end reverse air sealing device of a blast furnace gas TRT turbine unit, which can effectively play a role in preventing air flow from overflowing and achieve the sealing purpose.
The invention adopts the technical scheme that the shaft end reverse air sealing device of the blast furnace gas TRT turbine unit comprises a rotor main shaft and stator blades which are arranged in a shell, wherein a gas inlet channel and a gas outlet channel are respectively formed at two sides of each stator blade, small axial flow fans are respectively sleeved at positions of shaft end air sealing positions at two ends of the rotor main shaft, the axial flow fans are fixed on the rotor main shaft through shaft sleeves, the axial flow fans and the main shaft are concentric, after the rotor rotates, the axial flow fans are driven to rotate, the axial flow fans generate air flow opposite to shaft seal discharge, the pressure generated by the reverse air flow is utilized to prevent gas in a cylinder from leaking out through a shaft end air gap, a balance pipe is arranged between two side walls of the shell at the outer side of the axial flow fans, a gas balance valve is arranged on the balance pipe, the upper part of the balance pipe is communicated with the middle part of the shell, the introduced gas is controlled to be in an atmospheric pressure or micro-positive pressure state through the balance pipe.
The shaft end steam seal device of the original TRT unit is modified, the structural form of the steam seal of a rotor is changed, the original part of comb-tooth type air seal is removed, blades are additionally arranged at the removed part along the axial direction of the rotor, a whole circle of annular blades form a set of axial flow fan, the fan is fixed on the original rotor through a shaft sleeve, when the rotor rotates, the axial flow fan is driven to rotate, the air flow generated by the blades of the axial flow fan is opposite to the air flow leaking from an air cylinder, the reverse air flow pushes the leaking air flow, the air flow is prevented from overflowing, and the sealing purpose is achieved.
In order to ensure continuous through flow of the reverse secret fan and prevent external air from being inhaled, gas is introduced into the outer side of the reverse fan through a gas balance pipe, the introduced gas controls the pressure of the balance pipe through a regulating valve, and the pressure of the balance pipe is controlled in an atmospheric pressure or micro-positive pressure state.
Working principle:
1. and the reverse pressure difference method is used for preventing the coal gas from overflowing. The fan impeller rotates in operation to drive the shaft end sealing axial flow fan to rotate, and the air pressure generated by the sealing axial flow fan in the rotation process reversely pushes the gas leaking outside through the shaft gap to prevent the working gas from leaking outside through the shaft end gap. In practical application, according to the pressure of the leaked gas, the fan blades and the stage numbers with proper angles can be installed to meet the requirements of different pressures, and the leakage of the high-pressure gas is effectively prevented.
2. The reverse fan prevents the leakage of the gas and simultaneously sucks the external air, in order to prevent the external air from being sucked, maintain the air flow sealing the through flow of the axial flow fan and control the inlet pressure of the axial flow fan, low-pressure gas is introduced into the inlet of the axial end reverse axial flow fan, and the introduced gas is led out from the discharge side (low-pressure side) of the turbine through the balance pipe; the low-pressure coal gas introduced into the sealing fan controls the inlet pressure of the reverse axial flow fan through the regulating valve, so that the inlet wind pressure of the axial flow fan is ensured to be stable; in the running process, the inlet wind pressure of the axial flow fan is controlled to be minus 100 Pa to minus 1000Pa, so that the gas at the low pressure side of the axial flow fan is prevented from leaking under the micro-minus pressure state, and a large amount of external air does not enter the sealing system. The pressure of the suction chamber is controlled by the regulating valve, so that the gas leakage effect can be regulated and controlled, and the gas leakage device has adjustability under different working conditions or after the gap of the device is worn. Meanwhile, the axial flow fan can meet the minimum flow requirement, and meanwhile, the reverse axial flow fan blade is prevented from surging.
In order to maintain the micro negative pressure state, external air does not enter the shaft seal system, the original nitrogen seal is still reserved at the outermost part of the shaft end, the nitrogen pressure prevents the balance pipe coal gas from leaking out, and meanwhile, the external air is prevented from overflowing.
Drawings
Fig. 1 is a schematic diagram of a front view structure of the present invention.
Description of the embodiments
The shaft end reverse air seal device of the blast furnace gas TRT turbine unit comprises a rotor main shaft 8 and stator blades 10 which are arranged in a machine shell 3, wherein the rotor main shaft 8 is provided with moving blades 9, as shown in figure 1. The two sides of the stator blade 10 respectively form a gas inlet channel and a gas outlet channel. The two sides of the rotor main shaft 8 are respectively provided with a main shaft air seal 7, the casing 3 at the outer periphery of the main shaft air seal 7 is respectively provided with a reverse sealing cover 4 connected with a nitrogen pipe 6, the parts of the shaft end air seals at the two ends of the rotor main shaft 8 are respectively sleeved with a small axial flow fan 5, the axial flow fans 5 are fixed on the rotor main shaft 8 through shaft sleeves, the axial flow fans 5 and the rotor main shaft 8 are concentric, when the rotor main shaft 8 rotates, the axial flow fans 5 are driven to rotate, the axial flow fans 5 are positioned in the central holes of the reverse sealing covers 4, the axial flow fans 5 generate air flow opposite to the shaft seal discharge, the pressure generated by the reverse air flow is utilized to prevent the gas in the cylinder from leaking out of the gas through the shaft end air gaps, the balance pipe 1 is arranged outside the casing 3 in a communicating way between the reverse sealing covers 4 at the two side walls of the axial flow fans 5, the upper parts of the balance pipe 1 are communicated with the middle part of the casing 3, the balance pipe 2 is arranged on the balance pipe 1, the pressure of the balance pipe 1 is controlled through the balance pipe 1, the pressure of the balance pipe 1 is controlled, and the pressure of the balance pipe 1 is controlled under the atmospheric pressure or micro-pressure state.
Claims (1)
1. The utility model provides a reverse atmoseal device of shaft end of blast furnace gas TRT turbine unit, includes rotor main shaft and stator blade that is installed in the casing, characterized by: the two sides of the stator blade respectively form a gas inlet channel and a gas outlet channel, the positions of shaft ends air seals at two ends of a rotor main shaft are respectively sleeved with a small axial flow fan, the axial flow fans are fixed on the rotor main shaft through shaft sleeves, the axial flow fans and the main shaft are concentric, after the rotor rotates, the axial flow fans are driven to rotate, the axial flow fans generate air flow opposite to shaft seal discharge, the air pressure generated by the opposite air flow is used for preventing gas in a cylinder from leaking the gas outwards through a shaft end air gap, a balance pipe is communicated between two side walls of a casing at the outer side of the axial flow fans, a gas balance valve is arranged on the balance pipe, the upper part of the balance pipe is communicated with the middle part of the casing, the introduced gas is introduced through the balance pipe, the pressure of the balance pipe is controlled through the balance valve, and the pressure of the balance pipe is controlled in an atmospheric pressure or micro-positive pressure state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310978638.1A CN116906128A (en) | 2023-08-04 | 2023-08-04 | Shaft end reverse air seal device of blast furnace gas TRT turbine unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310978638.1A CN116906128A (en) | 2023-08-04 | 2023-08-04 | Shaft end reverse air seal device of blast furnace gas TRT turbine unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116906128A true CN116906128A (en) | 2023-10-20 |
Family
ID=88356488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310978638.1A Pending CN116906128A (en) | 2023-08-04 | 2023-08-04 | Shaft end reverse air seal device of blast furnace gas TRT turbine unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116906128A (en) |
-
2023
- 2023-08-04 CN CN202310978638.1A patent/CN116906128A/en active Pending
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