Blast furnace gas excess pressure turbine with gas inlet in middle and gas exhaust at two ends
By adopting the design of exhaust gas at both ends of the intermediate intake in the blast furnace gas residual pressure turbine, combining the two-stage blade rotors and the staggered blade set, the problem of sealing difficulty caused by high gas pressure in the blast furnace is solved, and higher sealing and energy conversion efficiency are achieved, reducing costs and fuel consumption.
Patent Information
- Application Number
- CN202421557467.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-07-03
AI Technical Summary
The existing blast furnace gas residual pressure turbine has a difficult sealing problem and has air leakage when the blast furnace gas pressure is high. The design of the intake and exhaust gas leads to large rotor thrust and large bearing fuel consumption.
The design of exhaust gas at both ends of the intermediate intake is adopted. A first-stage intake passage and a second-stage intake passage are provided in the middle of the outer shell, and a first-stage exhaust passage and a second-stage exhaust passage are provided at both ends. The two-stage blade rotor and an interlaced blade set are used to combine the deflector and the sealing ring to improve sealing and energy conversion efficiency.
It effectively solves the problem of difficult sealing caused by high gas pressure of blast furnaces, improves the overall sealing of the unit, reduces nitrogen loss, saves costs, and reduces the fuel consumption of thrust bearings, and extends the service life.
Smart Images
Figure CN222615402U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of blade type rotary turbines, in particular to a blast furnace gas residual pressure turbine with middle air intake and exhaust at both ends. Background Art
[0002] The Top Gas Pressure Recovery Turbine (TRT) is a product for waste energy recovery and power generation that is vigorously promoted by the State Economic and Trade and Metallurgical Industry Corporation. The principle of the blast furnace gas waste pressure turbine (TRT) is to use blast furnace gas with a certain pressure and temperature to perform external work by adiabatic expansion. TRT converts the internal energy of blast furnace gas into mechanical energy, that is, the TRT rotor rotates under the action of gas, and then drives the generator to generate electricity. Because it does not consume any fuel, it can reduce environmental pollution and increase electric energy for enterprises. It is an energy-saving equipment vigorously promoted by the metallurgical market.
[0003] Because the medium of the blast furnace gas residual pressure turbine is coal gas, which is toxic and harmful, the sealing of TRT is particularly important. The conventional blast furnace gas turbine structure adopts axial flow design, that is, one end of the high pressure chamber intakes air and the other end of the low pressure chamber exhausts air. Figure 1 As shown; although this air intake method is highly efficient, the blast furnace gas will flow toward the thrust bearing, and the blast furnace gas pressure is relatively high, resulting in problems such as difficult sealing and air leakage; at the same time, air is taken in at one end and exhausted at the other end, which results in a large thrust on the rotor and a large amount of oil consumption in the bearing.
[0004] Therefore, all existing TRT air intake housing high pressure chambers have air leakage problems. Therefore, the utility model discloses a residual pressure gas turbine with middle air intake and exhaust at both ends. Utility Model Content
[0005] In view of the deficiencies in the prior art, the utility model provides a blast furnace gas residual pressure turbine with middle air intake and exhaust at both ends, which solves the problems of high blast furnace gas pressure and great sealing difficulty in the prior turbine.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A blast furnace gas waste pressure turbine with middle air intake and two-end exhaust, comprising a casing, a two-stage blade rotor, a primary air intake channel, a secondary air intake channel, a primary exhaust channel and a secondary exhaust channel; a primary air intake channel and a secondary air intake channel are arranged in the middle of the casing; and a primary exhaust channel and a secondary exhaust channel are arranged at both ends of the casing;
[0008] A two-stage blade rotor is arranged in the housing, and a primary blade group and a secondary blade group are arranged around the two-stage blade rotor; the primary air intake channel and the secondary air intake channel are arranged between the primary blade group and the secondary blade group, and the primary exhaust channel and the secondary exhaust channel are arranged on both sides of the primary blade group and the secondary blade group respectively;
[0009] Blast furnace gas enters from the primary air inlet channel and the secondary air inlet channel, and passes through the primary blade group and the secondary blade group respectively; and then is discharged from the primary exhaust channel and the secondary exhaust channel respectively.
[0010] In this scheme, the first-level air inlet channel and the second-level air inlet channel are the high-pressure chambers through which blast furnace gas enters, and the first-level exhaust channel and the second-level exhaust channel on both sides are the low-pressure chambers through which blast furnace gas is discharged. Therefore, there is no problem of sealing the high-pressure chamber at the end of the two-stage blade rotor. Compared with the high-pressure diversion and low-pressure blocking sealing form adopted by traditional TRT seals, it can better realize the sealing of gas and improve the sealing of the entire unit.
[0011] Furthermore, the first-stage blade group includes two first-stage stationary blades and two first-stage moving blades; the first-stage moving blades are fixed to the two-stage blade rotor, and the first-stage stationary blades are fixed to the outer shell by bolts; the two first-stage stationary blades and the two first-stage moving blades are arranged alternately in sequence.
[0012] In this solution, the first-stage stationary blades are fixed by bolts to facilitate changing their angles, so that the flow rate and pressure of the blast furnace gas can be adjusted within a wider range.
[0013] Furthermore, the secondary blade group includes two secondary stationary blades and two secondary moving blades; the secondary moving blades are fixed to the two-stage blade rotor, and the secondary stationary blades are fixed to the outer shell by bolts; the two secondary stationary blades and the two secondary moving blades are arranged alternately in sequence.
[0014] Furthermore, guide plates are provided in the primary air intake channel, the secondary air intake channel, the primary exhaust channel and the secondary exhaust channel.
[0015] In this scheme, the guide plate is used to limit the flow direction and flow pressure of the blast furnace gas, so that it acts on the primary blade group and the secondary blade group at a higher flow rate, and drives the two-stage blade rotor to rotate, thereby improving the energy conversion efficiency.
[0016] Furthermore, the two-stage blade rotor at one end close to the first-stage exhaust passage is connected to the housing via a thrust bearing;
[0017] The two-stage blade rotor at one end close to the secondary exhaust passage is connected to the housing through a supporting bearing.
[0018] In this solution, the thrust bearing has a high axial load-bearing capacity. The thrust bearing is designed between the two-stage blade rotor and the casing to withstand the large axial force generated when the blast furnace flue gas acts on the two-stage blade rotor.
[0019] Further, the thrust bearing comprises a bearing body, and the bearing body is fixed inside the housing through a bearing seat;
[0020] One side of the bearing body is connected with two tile mounting plates, the opposite surfaces of the two tile mounting plates are fixed with tiles, and a thrust plate is abutted between the two tiles, and the thrust plate is fixed on the two-stage blade rotor;
[0021] A bearing pad is connected to the other side of the bearing body, and the bearing pad abuts against the two-stage blade rotor.
[0022] In this solution, pads and support pads are designed on both sides of the bearing body, which can simultaneously improve the axial bearing capacity and radial bearing capacity between the two-stage blade rotor and the casing.
[0023] Furthermore, the two-stage blade rotor is provided with a primary exhaust sealing ring at one end close to the primary exhaust passage; the two-stage blade rotor is also provided with a secondary exhaust sealing ring at one end close to the secondary exhaust passage.
[0024] In this solution, the primary exhaust sealing ring and the secondary exhaust sealing ring can seal the blast furnace gas inside the shell, thereby improving the overall sealing performance of the unit.
[0025] Furthermore, a first-stage air intake volute is provided in the first-stage air intake channel; a second-stage air intake volute is provided in the second-stage air intake channel; the first-stage air intake volute and the second-stage air intake volute are connected by a connecting plate; a sealing ring is provided on the connecting plate, and the sealing ring seals the first-stage air intake channel and the second-stage air intake channel.
[0026] In this solution, the sealing ring is designed to prevent the blast furnace gas in the primary air inlet channel and the secondary air inlet channel from flowing into each other, so as to affect the normal work of the blast furnace gas on the blades.
[0027] Furthermore, exhaust volutes are provided in both the primary exhaust passage and the secondary exhaust passage.
[0028] The beneficial effects of the utility model are:
[0029] The blast furnace gas waste pressure turbine provided by the utility model adopts a working mode of middle air intake and two-end exhaust, the middle air intake port is a high-pressure chamber, and the exhaust ports at both ends are low-pressure chambers, so the sealing work is carried out in the low-pressure chambers at both ends, and there is no problem of difficulty in sealing the high-pressure chamber; compared with the high-pressure dredging and low-pressure plugging adopted by the existing TRT sealing, by setting the nitrogen pressure to be 20-40kPa higher than the exhaust pressure for gas plugging, it can better achieve sealing of the gas and improve the overall sealing of the unit.
[0030] The pressure at the air inlet end of the existing TRT unit is relatively high, and a large amount of nitrogen is often consumed in order to seal the air inlet end. The utility model provides a structural form of a medium-blast furnace gas residual pressure turbine without sealing the high-pressure chamber, thereby reducing nitrogen loss and saving costs.
[0031] In order to balance the axial force at the intake end, the existing TRT unit has a relatively large thrust bearing structure design, which consumes a lot of oil. At the same time, the design of the oil station also needs to be more adaptable. The blast furnace gas waste pressure turbine disclosed in the utility model is designed with exhaust at both ends, which can balance the axial forces at both ends, so that the thrust bearing does not need to bear a large axial force, the oil consumption of the bearing will be greatly reduced, and the design of the oil station can be reduced accordingly. In comparison with the same model, the oil loss can be saved by about 50%, which can not only reduce the rotor axial force, improve the stability of the unit operation, extend the failure interval and service life of the thrust bearing, but also reduce costs.
[0032] As blast furnaces gradually develop towards low-temperature smelting, TRT units have serious problems with blade corrosion, which will also increase costs; the structural form of intermediate air intake and exhaust at both ends works on the primary blade group and the secondary blade group on the two-stage blade rotor at the same time, converting the internal energy of the coal gas into mechanical energy. While ensuring the high efficiency of the unit, the blade shape design of the core component can be made more compact. Under the same operating conditions, the blade strength can be improved, the blade service life can be increased, and the cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a schematic diagram of the medium flow direction of the existing blast furnace gas residual pressure recovery turbine;
[0034] Figure 2 It is a schematic cross-sectional structure diagram of a blast furnace gas waste pressure turbine with middle air intake and exhaust at both ends of the utility model;
[0035] Figure 3 It is a schematic diagram of the medium flow direction of the middle air intake and the exhaust at both ends of the utility model;
[0036] Figure 4 This is a schematic diagram of the structure of the first-level blade group of the utility model;
[0037] Figure 5 This is a schematic diagram of the structure of the secondary blade group of the utility model;
[0038] Figure 6 It is a schematic diagram of the thrust bearing structure of the utility model.
[0039] Reference numerals:
[0040] 1. Shell; 2. Two-stage blade rotor; 21. Support bearing; 211. Bearing body; 212. Bearing seat; 213. Pad mounting plate; 214. Pad; 215. Thrust plate; 216. Support pad; 22. Support bearing; 23. Primary exhaust seal ring; 24. Secondary exhaust seal ring; 25. Sealing ring; 3. Primary air intake passage; 31. Primary air intake volute; 4. Secondary air intake passage; 41. Secondary air intake volute; 5. Primary exhaust passage; 51. Exhaust volute; 6. Secondary exhaust passage; 7. Primary blade group; 71. Primary stationary blade; 72. Primary moving blade; 8. Secondary blade group; 81. Secondary stationary blade; 82. Secondary moving blade; 9. Guide plate; DETAILED DESCRIPTION
[0041] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. The specific implementation of the utility model is described below to facilitate the understanding of the utility model by those skilled in the art, but it should be clear that the utility model is not limited to the scope of the specific implementation. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.
[0042] like Figure 2-3 As shown, this embodiment provides a blast furnace gas waste pressure turbine with middle air intake and two-end exhaust. The blast furnace gas waste pressure turbine adopts a working mode of middle air intake and two-end exhaust. The middle air intake is a high-pressure chamber, and the exhaust ports at both ends are low-pressure chambers. Therefore, the sealing work is carried out in the low-pressure chamber, and there is no problem of high-pressure chamber sealing difficulty. It can better achieve sealing gas and improve the overall sealing of the unit; it specifically includes:
[0043] A housing 1, a two-stage blade rotor 2, a primary air inlet passage 3, a secondary air inlet passage 4, a primary exhaust passage 5, a secondary exhaust passage 6, a primary blade group 7 and a secondary blade group 8;
[0044] Among them, a primary air intake channel 3 and a secondary air intake channel 4 are provided in the middle of the outer shell 1; a primary exhaust channel 5 and a secondary exhaust channel 6 are provided at both ends of the outer shell 1 respectively; a two-stage blade rotor 2 is provided in the outer shell 1, and a primary blade group 7 and a secondary blade group 8 are provided around the two-stage blade rotor 2; the primary air intake channel 3 and the secondary air intake channel 4 are both provided between the primary blade group 7 and the secondary blade group 8, and the primary exhaust channel 5 and the secondary exhaust channel 6 are respectively provided on both sides of the primary blade group 7 and the secondary blade group 8; the blast furnace gas enters from the primary air intake channel 3 and the secondary air intake channel 4, and passes through the primary blade group 7 and the secondary blade group 8 respectively; and then is discharged from the primary exhaust channel 5 and the secondary exhaust channel 6 respectively.
[0045] like Figure 4As shown, the first-stage blade group 7 includes two first-stage stationary blades 71 and two first-stage moving blades 72; the first-stage moving blades 72 are fixed to the two-stage blade rotor 2, and the first-stage stationary blades 71 are fixed to the outer casing 1 by bolts; the two first-stage stationary blades 71 and the two first-stage moving blades 72 are arranged alternately in sequence; the first-stage stationary blades 71 are fixed by bolts, which is convenient for changing their angles, so that the flow and pressure of blast furnace gas can be adjusted within a wider range.
[0046] like Figure 5 As shown, the secondary blade group 8 includes two secondary stationary blades 81 and two secondary moving blades 82; the secondary moving blades 82 are fixed to the two-stage blade rotor 2, and the secondary stationary blades 81 are fixed to the outer casing 1 by bolts; the two secondary stationary blades 81 and the two secondary moving blades 82 are arranged alternately in sequence.
[0047] Guide plates 9 are provided in the primary air intake channel 3, the secondary air intake channel 4, the primary exhaust channel 5 and the secondary exhaust channel 6; the guide plates 9 are used to limit the flow direction and flow pressure of the blast furnace gas, so that it acts on the primary blade group 7 and the secondary blade group 8 at a higher flow rate, and drives the two-stage blade rotor 2 to rotate, thereby improving the energy conversion efficiency.
[0048] The two-stage blade rotor 2 at one end near the primary exhaust passage 5 is connected to the housing 1 via a thrust bearing 21; the thrust bearing 21 has a high axial load-bearing capacity and can withstand the large axial force generated when the blast furnace flue gas acts on the two-stage blade rotor 2. The two-stage blade rotor 2 at one end near the secondary exhaust passage 6 is connected to the housing 1 via a support bearing 22.
[0049] like Figure 6 As shown, the thrust bearing 21 includes a bearing body 211, a bearing seat 212, a pad mounting plate 213, a pad 214, a thrust plate 215, and a supporting pad 216; the bearing body 211 is fixed to the inside of the housing 1 through the bearing seat 212; two pad mounting plates 213 are connected to one side of the bearing body 211, and pads 214 are fixed to the opposite surfaces of the two pad mounting plates 213, and a thrust plate 215 is abutted between the two pads 214, and the thrust plate 215 is fixed to the two-stage blade rotor 2; the other side of the bearing body 211 is connected to a supporting pad 216, and the supporting pad 216 abuts against the two-stage blade rotor 2; the pads 214 and the supporting pads 216 are designed separately on the same bearing body 211, which can simultaneously improve the axial bearing capacity and radial bearing capacity between the two-stage blade rotor 2 and the housing 1.
[0050] The two-stage blade rotor 2 is provided with a primary exhaust sealing ring 23 at one end close to the primary exhaust channel 5; the two-stage blade rotor 2 is also provided with a secondary exhaust sealing ring 24 at one end close to the secondary exhaust channel 6; the primary exhaust sealing ring 23 and the secondary exhaust sealing ring 24 can seal the blast furnace gas inside the outer shell 1, thereby improving the overall sealing performance of the unit.
[0051] As a preferred embodiment of this embodiment, both the primary exhaust sealing ring 23 and the secondary exhaust sealing ring 24 are labyrinth sealing rings.
[0052] A first-stage air intake volute 31 is provided in the first-stage air intake channel 3; a second-stage air intake volute 41 is provided in the second-stage air intake channel 4; the first-stage air intake volute 31 and the second-stage air intake volute 41 are connected by a connecting plate; a sealing ring 25 is provided on the connecting plate, and the sealing ring 25 seals the first-stage air intake channel 3 and the second-stage air intake channel 4; the sealing ring 25 can prevent the blast furnace gas in the first-stage air intake channel 3 and the second-stage air intake channel 4 from flowing into each other, so as to affect the normal work of the blast furnace gas on the blades.
[0053] An exhaust volute 51 is disposed in both the primary exhaust passage 5 and the secondary exhaust passage 6 .
[0054] The working principle of this embodiment is:
[0055] When the blast furnace gas waste pressure turbine provided in this embodiment is working, the blast furnace gas enters from the primary air inlet channel 3 and the secondary air inlet channel 4; and passes through the primary blade group 7 and the secondary blade group 8 respectively, performing work on the two to convert their own internal energy into the mechanical energy of the two-stage blade rotor 2, so as to drive the two-stage blade rotor 2 to rotate; finally, the blast furnace gas is discharged from the primary exhaust channel 5 and the secondary exhaust channel 6 respectively.
[0056] Those skilled in the art will appreciate that the embodiments herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspiration disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.
Claims
1. A blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends, characterized in that: The invention comprises a housing (1), a two-stage blade rotor (2), a primary air inlet channel (3), a secondary air inlet channel (4), a primary air exhaust channel (5) and a secondary air exhaust channel (6); the primary air inlet channel (3) and the secondary air inlet channel (4) are arranged in the middle of the housing (1); the primary air exhaust channel (5) and the secondary air exhaust channel (6) are arranged at both ends of the housing (1); The two-stage blade rotor (2) is arranged in the housing (1), and a primary blade group (7) and a secondary blade group (8) are arranged around the two-stage blade rotor (2); the primary air intake channel (3) and the secondary air intake channel (4) are both arranged between the primary blade group (7) and the secondary blade group (8), and the primary exhaust channel (5) and the secondary exhaust channel (6) are respectively arranged on both sides of the primary blade group (7) and the secondary blade group (8); Blast furnace gas enters from the primary air inlet channel (3) and the secondary air inlet channel (4), passes through the primary blade group (7) and the secondary blade group (8) respectively, and is then discharged from the primary exhaust channel (5) and the secondary exhaust channel (6) respectively.
2. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 1, characterized in that: The first-stage blade group (7) comprises two first-stage stationary blades (71) and two first-stage moving blades (72); the first-stage moving blades (72) are fixed to the two-stage blade rotor (2), and the first-stage stationary blades (71) are fixed to the outer shell (1) by bolts; the two first-stage stationary blades (71) and the two first-stage moving blades (72) are arranged alternately in sequence.
3. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 2, characterized in that: The secondary blade group (8) comprises two secondary stationary blades (81) and two secondary moving blades (82); the secondary moving blades (82) are fixed to the two-stage blade rotor (2), and the secondary stationary blades (81) are fixed to the outer shell (1) by bolts; the two secondary stationary blades (81) and the two secondary moving blades (82) are arranged alternately in sequence.
4. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 3, characterized in that: Guide plates (9) are provided in the primary air intake channel (3), the secondary air intake channel (4), the primary exhaust channel (5) and the secondary exhaust channel (6).
5. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 1, characterized in that: The two-stage blade rotor (2) is connected to the housing (1) at one end close to the first-stage exhaust passage (5) via a thrust bearing (21); The two-stage blade rotor (2) and the housing (1) are connected via a support bearing (22) at one end close to the secondary exhaust passage (6).
6. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 5, characterized in that: The thrust bearing (21) comprises a bearing body (211), and the bearing body (211) is fixed inside the housing (1) via a bearing seat (212); Two tile mounting plates (213) are connected to one side of the bearing body (211), tiles (214) are fixed to the opposite surfaces of the two tile mounting plates (213), a thrust plate (215) is abutted between the two tiles (214), and the thrust plate (215) is fixed to the two-stage blade rotor (2); A support shoe (216) is connected to the other side of the bearing body (211), and the support shoe (216) abuts against the two-stage blade rotor (2).
7. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 5, characterized in that: The two-stage blade rotor (2) is provided with a primary exhaust sealing ring (23) at one end close to the primary exhaust passage (5); the two-stage blade rotor (2) is also provided with a secondary exhaust sealing ring (24) at one end close to the secondary exhaust passage (6).
8. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 1, characterized in that: A first-stage air intake volute (31) is provided in the first-stage air intake passage (3); a second-stage air intake volute (41) is provided in the second-stage air intake passage (4); the first-stage air intake volute (31) and the second-stage air intake volute (41) are connected via a connecting plate; a sealing ring (25) is provided on the connecting plate, and the sealing ring (25) seals the first-stage air intake passage (3) and the second-stage air intake passage (4).
9. The blast furnace gas waste pressure turbine with intermediate air intake and exhaust at both ends according to claim 8, characterized in that: An exhaust volute (51) is provided in both the primary exhaust passage (5) and the secondary exhaust passage (6).