A blast furnace gas top pressure recovery turbine system

Abstract

The present invention provides a blast furnace gas pressure recovery turbine system, which includes a turbine. One side of the turbine has an air inlet, and the other side has an exhaust port. The air inlet of the turbine is connected to an inlet pipeline, and the inlet pipeline is also connected to the outlet of a gas purification device. The exhaust port of the turbine is connected to an exhaust pipeline, and the exhaust pipeline is also connected to a gas pipeline network. By reasonably arranging the types and positions of the supports of the gas pipeline, optimizing the type of compensator and combining it with specific elastic components for thermal expansion compensation and support of the gas turbine and the pipe system, the long-term safe and stable operation of the unit and the pipe system is ensured. It can overcome the defects in the prior art that the settings of supports, compensators, etc. in the gas turbine pipeline are unreasonable, resulting in serious overloading of the gas turbine and unstable operation of the unit.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and particularly to a blast furnace gas pressure recovery turbine system. Background Art

[0002] Gas turbines are widely used in the metallurgical industry. The inlet temperature of the gas turbine is as high as more than 200 °C. When the gas turbine is operating, there are certain thermal displacements in the horizontal and vertical directions at the equipment nozzles. After the gas is sent out from the blast furnace, it is sent to the gas turbine through gravity dust removal and bag dust removal. The gas turbine uses the residual pressure and energy of the blast furnace gas to generate electricity or directly drive a blower to do work directly. The blast furnace gas after driving the gas turbine to do work is sent to the subsequent process section through the pipe gallery.

[0003] In the traditional gas turbine gas pipeline, the types and positions of the supports are not entirely reasonable; the compensator is not combined with a specific spring for thermal expansion compensation and support of the gas turbine and the pipe system, resulting in serious overloading of the gas turbine, unstable operation of the unit, and potential safety hazards for the long-term safe operation of the turbine unit. Summary of the Invention

[0004] Therefore, the present invention provides a blast furnace gas pressure recovery turbine system, which can overcome the defects in the gas pipeline of the gas turbine in the prior art, such as unreasonable settings of supports, etc., and the compensator is not combined with a specific spring for thermal expansion compensation and support of the gas turbine and the pipe system, resulting in serious overloading of the gas turbine and unstable operation of the unit.

[0005] To solve the above problems, the present invention provides a blast furnace gas pressure recovery turbine system, including a turbine, which has an air inlet on one side and an exhaust port on the other side. The air inlet of the turbine is connected to an inlet pipeline, and the inlet pipeline is also connected to the outlet of a gas purification device. The exhaust port of the turbine is connected to an exhaust pipeline, and the exhaust pipeline is also connected to a gas pipeline network. From the outlet of the gas purification device to the air inlet of the turbine, a first compensator, a quick cut-off valve, and a second compensator are sequentially connected and arranged on the inlet pipeline. On the exhaust pipeline, from the exhaust port of the turbine to the gas pipeline network, a third compensator and a fourth compensator are sequentially connected and arranged. The blast furnace gas pressure recovery turbine system also includes a first support, a second support, and an elastic component. The first support is arranged between the first compensator and the quick cut-off valve and on the side close to the first compensator. Between the quick cut-off valve and the second compensator, the first support is arranged on the side close to the quick cut-off valve, and the second support is arranged on the side close to the second compensator. Between the third compensator and the fourth compensator, the second support is arranged on the side close to the third compensator, and the first support is arranged on the side close to the fourth compensator. The elastic components are respectively arranged at the bottoms of the second compensator and the third compensator.

[0006] In some embodiments, the elastic component includes a compensator support, an elastic member, and a base. The compensator support is fixedly connected to the compensator. One end of the elastic member abuts against the compensator support, and the other end is fixedly connected to the base.

[0007] In some embodiments, the elastic member is a spring.

[0008] In some embodiments, the blast furnace gas pressure recovery turbine system further includes a bypass pipeline module and a pressure reducing valve group module. The turbine, the bypass pipeline module, and the pressure reducing valve group module are arranged in parallel with each other. The bypass pipeline module includes a bypass pipeline. One end of the bypass pipeline is connected to the intake pipeline to form a connection part, and the other end is connected to the exhaust pipeline. A first bypass valve and a second bypass valve are arranged in parallel on the bypass pipeline. A fifth compensator is arranged between the connection part and the bypass valve. A fourth support is arranged on the side of the second bypass valve close to the fifth compensator. The pressure reducing valve group module includes a pressure reducing valve group bypass. One end of the pressure reducing valve group bypass is connected to the outlet of the gas purification device, and the other end is connected to the gas pipeline network. A plurality of pressure reducing valve groups are arranged in parallel on the pressure reducing valve group bypass.

[0009] In some embodiments, a plurality of gas blow-off pipes are further arranged on the intake pipeline, the exhaust pipeline, and the bypass pipeline. One end of each gas blow-off pipe is connected to the pipeline, and the other end is connected to a blow-off rain cap, which is used to displace the gas in the pipeline during system maintenance. There are two second cut-off valves on the gas blow-off pipe, and a sampling valve is arranged between the two second cut-off valves.

[0010] In some embodiments, the turbine includes a blow-off system. The blow-off system includes a plurality of parallel gas pipelines communicated with the turbine. Each gas pipeline is provided with a first cut-off valve. The plurality of gas pipelines converge and are discharged from the outlet. A dismountable flange is arranged at the converging pipeline of the plurality of gas pipelines.

[0011] In some embodiments, the blast furnace gas pressure recovery turbine system further includes an equalizing valve. The equalizing valve is arranged in parallel with the quick cut-off valve. The third support is located on one side of the equalizing valve.

[0012] In some embodiments, the blast furnace gas pressure recovery turbine system further includes an inlet square-round piece. One end of the inlet square-round piece is connected to the second compensator, and the other end is connected to the intake port of the turbine. An outlet square pipe piece, a square elbow, and a square-round pipe are sequentially connected between the exhaust port of the turbine and the third compensator. The outlet square pipe piece is connected to the exhaust port of the turbine. Reinforcing ribs are arranged on the outer peripheral walls of the inlet square-round piece, the outlet square pipe piece, the square elbow, and the square-round pipe.

[0013] In some embodiments, the first bracket is a sliding bracket or a guiding bracket;

[0014] The second bracket is a fixed bracket for restricting the displacement and torque of the pipeline support point.

[0015] In some embodiments, the blast furnace gas pressure recovery turbine system further includes a regulating valve. One end of the regulating valve is connected to the quick cut-off valve, and the other end is connected to the second compensator for controlling the gas flow rate in the inlet pipeline.

[0016] A blast furnace gas pressure recovery turbine system provided by the present invention compensates for the thermal expansion of the gas turbine and the pipe system and provides support by reasonably setting the types and positions of the pipeline brackets, optimizing the type of compensator and combining it with specific elastic components, ensuring the long-term safe and stable operation of the unit pipe system.

[0017] Advantages of the present invention:

[0018] (1) By reasonably setting the component structure and designing an elastic component with a rated load at the lower part of the compensator, it can effectively compensate for the thermal expansion of the unit and the gas pipeline at the inlet and outlet ports through analysis and calculation, thus supporting the long-term safe and stable operation of the unit under the stable support of the pipe system.

[0019] (2) By setting appropriate distributed specific reinforcing ribs on the outer peripheral wall of the inlet square-round piece, outlet pipe square pipe fitting, square elbow, and square-round pipe according to the local fatigue stress analysis, and making special settings for the wall thickness and dimensions to adapt to the fatigue stress working conditions of the gas pressure pipeline.

[0020] (3) By setting a double second cut-off valve for the gas turbine blow-off pipe, it ensures the safe cut-off of gas during the operation of the gas turbine. A sampling valve is set between the two second cut-off valves to sample the medium of the gas turbine blow-off pipe and check and analyze the replacement situation of the gas pipeline.

[0021] (4) By setting a dismountable flange in the gas turbine casing blow-off system, during the process of overhauling and removing the upper cover of the gas turbine, it only needs to disassemble the dismountable flange and then it can be lifted by a crane, which is convenient for overhaul and maintenance. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the blast furnace gas pressure recovery turbine system according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the second compensator and the elastic component of the blast furnace gas pressure recovery turbine system according to an embodiment of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the third compensator and the elastic component of the blast furnace gas pressure recovery turbine system according to an embodiment of the present invention.

[0025] The reference numerals are shown as follows:

[0026] 1. Maintenance manhole; 2. Bleeder pipe; 3. Inlet butterfly valve; 4. Inlet slide gate valve; 5. Equalizing valve; 6. Quick cut-off valve; 7. Control valve; 8. Second compensator; 9. Inlet square-round piece; 10. Square elbow; 11. Square-round pipe; 12. Third compensator; 13. Outlet slide gate valve; 14. Outlet butterfly valve; 15. Pressure reducing valve group; 16. First bypass valve; 17. Second bypass valve; 18. Outlet square pipe fitting; 20. Drainage device; 21. First cut-off valve; 22. Demountable flange; 23. Rain cover; 24. First support; 25. Second support; 26. First compensator; 27. Fourth compensator; 28. Second cut-off valve; 29. Sampling valve; 30. Bypass pipeline; 31. Fifth compensator; 32. Compensator support; 33. Elastic member; 34. Base; 40. Pressure reducing valve group bypass; 50. Inlet pipeline; 55. Third support; 56. Fourth support; 60. Exhaust pipeline; 100. Turbine. Detailed implementation manners

[0027] Refer to in combination Figures 1-3As shown in the figure, according to an embodiment of the present invention, a blast furnace gas pressure recovery turbine system is provided, which includes a turbine 100. One side of the turbine 100 has an air inlet, and the other side has an exhaust port. The air inlet of the turbine 100 is connected to an inlet pipeline 50, and the inlet pipeline 50 is also connected to the outlet of a gas purification device. The exhaust port of the turbine 100 is connected to an exhaust pipeline 60, and the exhaust pipeline 60 is also connected to a gas pipeline network. From the outlet of the gas purification device to the air inlet of the turbine 100, a first compensator 26, a quick cut-off valve 6, and a second compensator 8 are sequentially connected and arranged on the inlet pipeline 50. From the exhaust port of the turbine 100 to the gas pipeline network, a third compensator 12 and a fourth compensator 27 are sequentially connected and arranged on the exhaust pipeline 60. The blast furnace gas pressure recovery turbine system further includes a first support 24, a second support 25, and an elastic component. The first support 24 is arranged on the side close to the first compensator 26 between the first compensator 26 and the quick cut-off valve 6. Between the quick cut-off valve 6 and the second compensator 8, the first support 24 is arranged on the side close to the quick cut-off valve 6, and the second support 25 is arranged on the side close to the second compensator 8. Between the third compensator 12 and the fourth compensator 27, the second support 25 is arranged on the side close to the third compensator 12, and the first support 24 is arranged on the side close to the fourth compensator 27. Elastic components are respectively arranged at the bottoms of the second compensator 8 and the third compensator 12, which can provide stable support and thermal expansion displacement compensation for the pipe system where the compensators are located. The second support 25 on the side of the second compensator 8 close to the quick cut-off valve 6 divides and cuts off the thermal expansion of the external pipeline of the inlet pipeline 50 and the thermal expansion of the gas turbine 100 and the pipeline below the air inlet, avoiding the influence of the thermal expansion of the external pipe system on the normal operation of the unit. The external pipeline is the pipeline section between the first compensator 26 and the second support 25 on the inlet pipeline 50, and the pipeline below the air inlet is the pipeline section between the second support 25 and the air inlet of the turbine 100 on the inlet pipeline 50.

[0028] Specifically, on the intake pipeline 50, a first support 24, a maintenance manhole 1, a relief pipe 2, an inlet butterfly valve 3, a maintenance manhole 1, a relief pipe 2, an inlet flap valve 4, a maintenance manhole 1, and a relief pipe 2 are sequentially arranged from the first compensator 26 to the quick cut-off valve 6. From the quick cut-off valve 6 to the intake port of the turbine 100, a relief pipe 2, a first support 24, a drainer 20, a regulating valve 7, a second support 25, a second compensator 8, and an inlet square-round piece 9 are sequentially arranged. The operation logic is as follows: The first compensator 26 absorbs the pipe system thermal expansion compensation between the intake pipeline between the connection point of the purification device external network and the intake pipeline 50 and the second support 25; the combined cut-off valve group of the inlet butterfly valve 3 and the inlet flap valve 4 is set to realize the reliable cut-off of the gas between the gas turbine 100 and the external network system; the quick cut-off valve 6 is set, and when the gas turbine 100 fails, the intake of the gas turbine 100 can be quickly cut off. During the start-up and maintenance of the gas turbine and the pipe system, the relief pipe 2 is used to displace the gas in the turbine 100 and the pipe system; the drainer 20 is set as an automatic gas condensate drainer, which is used to drain the condensate in the gas pipeline during the start-up / operation of the gas turbine, ensuring the long-term stable operation of the gas turbine and the pipe system.

[0029] Specifically, on the exhaust pipeline 60, a second support 25, a maintenance manhole 1, a drainer 20, an outlet flap valve 13, a maintenance manhole 1, a relief pipe 2, an outlet butterfly valve 14, a maintenance manhole 1, a relief pipe 2, and a first support 24 are sequentially arranged from the third compensator 12 to the fourth compensator 27. The operation logic is as follows: The fourth compensator 27 absorbs the pipe system thermal expansion compensation between the second support 25 on the gas exhaust pipeline 60 and the pipeline to the gas transmission network; the combined cut-off valve group of the outlet butterfly valve 14 and the outlet flap valve 13 is set to realize the reliable cut-off of the gas between the gas turbine 100 and the external network system. Appropriate supports are arranged under the quick cut-off valve 6, the inlet flap valve 4, the inlet butterfly valve 3, the outlet flap valve 13, and the outlet butterfly valve 14 according to the valve structure to support the aforementioned valves and prevent the excessive weight of the valves from affecting the operation of the pipeline.

[0030] Preferably, both the inlet flap valve 4 and the outlet flap valve 13 are closed type or both are open type.

[0031] Preferably, the quick cut-off valve 6 is driven by hydraulic oil and has an emergency quick closing function, and the regulating valve 7 is driven by hydraulic oil.

[0032] Preferably, both the second compensator 8 and the third compensator 12 are elbow pressure balance type compensators, solving the problem of unreasonable setting of the existing gas pipeline compensator type.

[0033] In a specific embodiment, the elastic component includes a compensator support 32, an elastic member 33, and a base 34. The compensator support 32 is fixedly connected to the compensator. One end of the elastic member 33 abuts against the compensator support 32, and the other end is fixedly connected to the base 34.

[0034] In a specific embodiment, the elastic member 33 is a spring.

[0035] Preferably, there are at least two springs. The multiple springs are built into a spring sleeve or a spring box to prevent non-axial bending deformation of the springs when they are stressed. One end of the spring close to the compensator support 32 is provided with a PTFE pad to ensure free sliding between the top of the spring and the compensator support 32. The bottom of the spring is welded to the embedded steel plate or steel beam on the top of the base 34 to ensure a firm and stable support for the lower part of the spring.

[0036] In a specific embodiment, the blast furnace gas top pressure recovery turbine system further includes a bypass pipeline module and a pressure reducing valve group module. The turbine 100, the bypass pipeline module and the pressure reducing valve group module are arranged in parallel with each other. The bypass pipeline module includes a bypass pipeline 30. One end of the bypass pipeline 30 is connected to the intake pipeline 50 to form a connection part, and the other end is connected to the exhaust pipeline 60. A first bypass valve 16 and a second bypass valve 17 are arranged in parallel on the bypass pipeline 30. A fifth compensator 31 is arranged between the connection part and the two bypass valves. A fourth support 56 is arranged on the side of the second bypass valve 17 close to the fifth compensator 31. The pressure reducing valve group module includes a pressure reducing valve group bypass 40. One end of the pressure reducing valve group bypass 40 is connected to the outlet of the gas purification device, and the other end is connected to the gas pipeline network. A plurality of pressure reducing valve groups 15 are arranged in parallel on the pressure reducing valve group bypass 40. The bypass pipeline 30 is provided with a first bypass valve 16 and a second bypass valve 17. When the gas turbine 100 makes an emergency shutdown, the bypass valves open quickly, and at the same time, the quick cut-off valve 6 of the gas inlet pipeline closes quickly to quickly cut off the intake gas of the gas turbine 100. The gas before the quick cut-off valve of the gas inlet pipeline enters the gas exhaust pipeline through the bypass pipeline 30. If the turbine 100 needs to be overhauled for a long time, the pressure reducing valve group 15 is put into use to take over the control of the blast furnace top pressure from the turbine 100.

[0037] Preferably, the first compensator 26, the fourth compensator 27, and the fifth compensator 31 are compound tie rod type compensators.

[0038] Specifically, the third support 55 and the fourth support 56 are appropriately selected according to the actual use working conditions. Preferably, the third support 55 and the fourth support 56 are sliding supports.

[0039] In a specific embodiment, a plurality of vent pipes 2 are further provided on the intake pipe 50, the exhaust pipe 60 and the bypass pipe 30. One end of the vent pipe 2 is connected to the pipe, and the other end is connected to a vent rain cap 23 for displacing the gas in the pipe. There are two second cut-off valves 28 on the vent pipe 2, and a sampling valve 29 is arranged between the two second cut-off valves 28. The double second cut-off valves 28 are provided to ensure the safe cut-off of the gas in the gas vent pipe during the operation of the gas turbine 100. The sampling valve 29 is arranged between the two cut-off valves to sample the medium of the gas vent pipe and check and analyze the replacement condition of the gas pipeline.

[0040] In a specific embodiment, the turbine 100 has a venting system, and the venting system includes a plurality of parallel gas pipelines communicated with the turbine 100. A first cut-off valve 21 is arranged at one end of each gas pipeline close to the turbine 100. After the plurality of gas pipelines converge, they are discharged from the outlet. A dismountable flange 22 is arranged on the pipeline at the convergence of the plurality of gas pipelines. When overhauling the upper cover of the turbine 100, it only needs to disassemble the dismountable flange 22 and then it can be lifted by a crane, which is convenient for overhaul and maintenance.

[0041] In a specific embodiment, the blast furnace gas pressure recovery turbine system further includes a pressure equalizing valve 5, and the pressure equalizing valve 5 is arranged in parallel with the quick cut-off valve 6.

[0042] In a specific embodiment, the blast furnace gas pressure recovery turbine system further includes an inlet square-round piece 9. One end of the inlet square-round piece 9 is connected to the second compensator 8, and the other end is connected to the intake port and pipeline of the turbine 100. Between the exhaust port of the turbine 100 and the third compensator 12, an outlet square pipe fitting 18, a square elbow 10 and a square-round pipe 11 are sequentially connected. The outlet square pipe fitting 18 is connected to the exhaust port of the turbine 100, and the other end is connected to one end of the square elbow 10; the other end of the square elbow 10 is connected to one end of the square-round pipe 11; the other end of the square-round pipe 11 is connected to the third compensator 12 and the pipeline. Reinforcing ribs are arranged on the outer peripheral walls of the inlet square-round piece 9, the outlet square pipe fitting 18, the square elbow 10 and the square-round pipe 11. Since the above-mentioned pipe fittings have special shapes and are different from circular cross-section pipes, their stress is less stable than that of circular pipe fittings and their pressure-bearing capacity is poor. In order to adapt to the working condition of the fatigue stress of the gas pressure pipeline, appropriate distribution of specific reinforcing ribs is arranged on the outer peripheral wall of the aforementioned special parts according to the local fatigue stress analysis, and measures such as reasonably setting the wall thickness and dimensions according to the stress distribution can ensure the safe use of the special parts.

[0043] In a specific embodiment, the first bracket 24 is a sliding bracket or a guiding bracket. The second bracket 25 is a fixed bracket for restricting displacements and torques in all directions at the pipe support point. The fixed bracket divides and cuts off the thermal expansion of the external pipeline of the pipe system where it is located from the thermal expansion of the intake and exhaust ports of the internal gas turbine itself and the part of the pipe system where it is located; avoiding the influence of the thermal expansion of the external pipe system on the normal operation of the unit.

[0044] Preferably, the sliding bracket includes a sliding support and a sliding support structure, the guiding bracket includes a guiding support and a guiding support structure, a polytetrafluoroethylene backing plate is arranged between the bottom of the sliding support and the top of the sliding support structure, and a polytetrafluoroethylene backing plate is arranged between the bottom of the guiding support and the top of the guiding support structure.

[0045] In a specific embodiment, the blast furnace gas pressure recovery turbine system further includes a regulating valve 7, one end of the regulating valve 7 is connected to the quick cut-off valve 6, and the other end is connected to the second compensator 8 for controlling the gas flow rate in the intake pipeline 50.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A blast furnace gas pressure recovery turbine system includes a turbine (100) which has an air inlet on one side and an exhaust port on the other side. The air inlet of the turbine (100) is connected to an intake pipeline (50), and the intake pipeline (50) is also connected to the outlet of a gas purification device. The exhaust port of the turbine (100) is connected to an exhaust pipeline (60), and the exhaust pipeline (60) is also connected to a gas distribution network. From the outlet of the gas purification device to the air inlet of the turbine (100), a first compensator (26), a quick cut-off valve (6), and a second compensator (8) are sequentially connected and arranged on the intake pipeline (50). On the exhaust pipeline (60), from the exhaust port of the turbine (100) to the gas distribution network, a third compensator (12) and a fourth compensator (27) are sequentially connected and arranged. It is characterized in that, It further includes a first bracket (24), a second bracket (25) and an elastic component; the first bracket (24) is arranged between the first compensator (26) and the quick cut-off valve (6) and on the side close to the first compensator (26); between the quick cut-off valve (6) and the second compensator (8), the first bracket (24) is arranged on the side close to the quick cut-off valve (6), and the second bracket (25) is arranged on the side close to the second compensator (8); between the third compensator (12) and the fourth compensator (27), the second bracket (25) is arranged on the side close to the third compensator (12), and the first bracket (24) is arranged on the side close to the fourth compensator (27); the elastic components are respectively arranged at the bottoms of the second compensator (8) and the third compensator (12); The elastic component includes a compensator support seat (32), an elastic member (33) and a base (34), the compensator support seat (32) is fixedly connected with the compensator, one end of the elastic member (33) abuts against the compensator support seat (32), and the other end thereof is fixedly connected with the base (34); the elastic member (33) is a spring; It further includes a bypass pipeline module and a pressure reducing valve group module, the turbine (100), the bypass pipeline module and the pressure reducing valve group module are arranged in parallel with each other, the bypass pipeline module includes a bypass pipeline (30), one end of the bypass pipeline (30) is connected with the intake pipeline (50) to form a connection part, and the other end is connected with the exhaust pipeline (60), a first bypass valve (16) and a second bypass valve (17) are arranged in parallel on the bypass pipeline (30); a fifth compensator (31) is arranged between the connection part and the bypass valve, a fourth bracket (56) is arranged on the side of the second bypass valve (17) close to the fifth compensator (31), the pressure reducing valve group module includes a pressure reducing valve group bypass (40), one end of the pressure reducing valve group bypass (40) is connected with the outlet of the gas purification device, and the other end is connected with the gas pipeline network, and a plurality of pressure reducing valve groups (15) are arranged in parallel on the pressure reducing valve group bypass (40).

2. The blast furnace gas pressure recovery turbine system according to claim 1, wherein, A plurality of gas blow-off pipes (2) are further arranged on the intake pipeline (50), the exhaust pipeline (60) and the bypass pipeline (30), one end of the gas blow-off pipe (2) is connected with the pipeline, and the other end is connected with a blow-off rain cap (23) for replacing the gas in the pipeline during system maintenance; there are two second cut-off valves (28) on the gas blow-off pipe (2), and a sampling valve (29) is arranged between the two second cut-off valves (28).

3. The blast furnace gas pressure recovery turbine system according to claim 1, wherein The turbine (100) includes a blow-off system, the blow-off system includes a plurality of gas pipelines that are communicated with the turbine (100) and arranged in parallel with each other, a first cut-off valve (21) is arranged on each gas pipeline, the plurality of gas pipelines converge and are discharged from the outlet, and a dismounting flange (22) is arranged at the converging pipeline of the plurality of gas pipelines.

4. The blast furnace gas pressure recovery turbine system according to claim 1, characterized in that It further includes a pressure equalizing valve (5) and a third support (55). The pressure equalizing valve (5) is arranged in parallel with the quick cut-off valve (6), and the third support (55) is located on one side of the pressure equalizing valve (5).

5. The blast furnace gas pressure recovery turbine system according to claim 1, wherein, It further includes an inlet square-round piece (9). One end of the inlet square-round piece (9) is connected to the second compensator (8), and the other end is connected to the air inlet of the turbine (100). An outlet square pipe fitting (18), a square elbow (10), and a square-round pipe (11) are sequentially connected between the exhaust port of the turbine (100) and the third compensator (12). The outlet square pipe fitting (18) is connected to the exhaust port of the turbine (100). Reinforcing ribs are provided on the outer peripheral walls of the inlet square-round piece (9), the outlet square pipe fitting (18), the square elbow (10), and the square-round pipe (11).

6. The blast furnace gas pressure recovery turbine system according to claim 1, wherein, The first support (24) is a sliding support or a guiding support; the second support (25) is a fixed support for restricting the displacement and torque of the pipe support point.

7. The blast furnace gas pressure recovery turbine system according to claim 1, wherein It further includes a regulating valve (7). One end of the regulating valve (7) is connected to the quick cut-off valve (6), and the other end is connected to the second compensator (8) for controlling the gas flow rate in the intake pipeline (50).

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