Sub-cavity hydraulic test method for lightweight blast furnace gas residual pressure recovery turbine casing

Abstract

The present invention provides a method for testing the sub-chamber water pressure of a lightweight blast furnace gas excess pressure recovery turbine casing. The method employs a step-by-step multiple pressurization method to pressurize the high-pressure chamber and the low-pressure chamber of the sub-chamber water pressure testing device for the lightweight blast furnace gas excess pressure recovery turbine casing. The step-by-step multiple pressurization method includes nine times of high pressure application to the high-pressure chamber and three times of low pressure application to the low-pressure chamber. The method for testing the sub-chamber water pressure of a lightweight blast furnace gas excess pressure recovery turbine casing of the present invention avoids the phenomenon of severe casing deformation or even water leakage caused by a single pressurization by employing a step-by-step multiple pressurization method, thereby achieving water pressure testing of the lightweight blast furnace gas excess pressure recovery turbine casing.

Description

Technical Field

[0001] The present invention belongs to the technical field of blast furnace gas excess pressure recovery turbine manufacturing, relates to a lightweight blast furnace gas excess pressure recovery turbine casing, and specifically relates to a chamber water pressure test method for a lightweight blast furnace gas excess pressure recovery turbine casing. Background Art

[0002] The casing is a crucial component of a blast furnace gas pressure recovery turbine. It forms the gas flow path, bears the weight of the rotor components, and forms a sealed cavity. During operation, the casing may deform and leak, potentially damaging the blast furnace gas pressure recovery turbine. Therefore, the casing's performance needs to be tested before shipment. Currently, a hydraulic pressure test is commonly used to test casing performance. The test involves filling the casing cavity with water, then applying pressure once, and observing the casing's deformation. However, for lightweight casings, applying pressure once can lead to severe deformation and even water leakage, causing the test to fail. Summary of the Invention

[0003] In view of the defects and shortcomings of the existing technology, the purpose of the present invention is to provide a chamber water pressure test method for a lightweight blast furnace gas residual pressure recovery turbine casing, so as to solve the technical problem of the existing technology causing test failure due to severe deformation of the lightweight casing and water leakage during water pressure testing.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A method for a sub-cavity hydraulic pressure test of a lightweight blast furnace gas excess pressure recovery turbine casing is disclosed. The method employs a step-by-step multiple pressurization method to pressurize the high-pressure chamber and low-pressure chamber of a sub-cavity hydraulic pressure test device for a lightweight blast furnace gas excess pressure recovery turbine casing.

[0006] The specific process of the described stepped multiple pressurization is: the high-pressure chamber is pressurized once and twice in sequence; the high-pressure chamber is continued to be pressurized three times, and the low-pressure chamber is pressurized once while the high-pressure is applied three times; the high-pressure chamber is continued to be pressurized four times, and the low-pressure chamber is pressurized twice while the high-pressure is applied four times; then the pressure of the low-pressure chamber remains unchanged, and the high-pressure chamber is continued to be pressurized five times, six times, seven times and eight times in sequence; the high-pressure chamber is continued to be pressurized nine times, and the low-pressure chamber is pressurized three times at the same time.

[0007] The present invention also has the following technical features:

[0008] Specifically, the pressure of the first low pressure application is 0.05 MPa; the pressure of the second low pressure application is 0.07 MPa; the pressure of the third low pressure application is 0.14 MPa;

[0009] The pressure of the first high pressure is 0.1MPa; the pressure of the second high pressure is 0.15MPa; the pressure of the third high pressure is 0.2MPa; the pressure of the fourth high pressure is 0.23MPa; the pressure of the fifth high pressure is 0.25MPa; the pressure of the sixth high pressure is 0.27MPa; the pressure of the seventh high pressure is 0.28MPa; the pressure of the eighth high pressure is 0.29MPa; and the pressure of the ninth high pressure is 0.3MPa.

[0010] Specifically, the sub-chamber hydraulic test device for a lightweight blast furnace gas excess pressure recovery turbine casing includes a lightweight blast furnace gas excess pressure recovery turbine casing;

[0011] The axial ends of the lightweight blast furnace gas waste pressure recovery turbine casing are open, and the space inside the lightweight blast furnace gas waste pressure recovery turbine casing is the casing cavity; the inner wall of the lightweight blast furnace gas waste pressure recovery turbine casing is sequentially installed with front partitions, middle partitions and rear partitions from front to back, and the front partitions, middle partitions and rear partitions divide the casing cavity into four independent and non-interconnected cavities, which are the front transition chamber, high-pressure chamber, low-pressure chamber and rear transition chamber from front to back, and the high-pressure chamber and the low-pressure chamber are closed spaces.

[0012] Specifically, the lightweight blast furnace gas excess pressure recovery turbine casing includes an upper casing and a lower casing;

[0013] The upper casing includes a first upper casing segment, a second upper casing segment, a third upper casing segment, a fourth upper casing segment, and a fifth upper casing segment, which are integrally arranged from front to back; the front end surface of the second upper casing segment is an inwardly concave semi-arc surface, and the rear end surface of the second upper casing segment is a flat surface; the front end surface of the fourth upper casing segment is a flat surface, and the rear end surface of the fourth upper casing segment is an inwardly concave semi-arc surface;

[0014] A front upper inner extension section is provided at the connection between the second upper casing section and the third upper casing section, and a rear upper inner extension section is provided at the connection between the third upper casing section and the fourth upper casing section; both the front upper inner extension section and the rear upper inner extension section extend into the high-pressure chamber;

[0015] The lower casing includes a first lower casing segment, a second lower casing segment, a third lower casing segment, a fourth lower casing segment, and a fifth lower casing segment, which are integrally arranged in sequence from front to back; the front end surface of the fourth lower casing segment is a flat surface, and the rear end surface of the fourth lower casing segment is an inwardly concave semi-arc surface;

[0016] A front lower inner extension section is provided at the connection between the second lower casing section and the third lower casing section, and a rear lower inner extension section is provided at the connection between the third lower casing section and the fourth lower casing section; both the front lower inner extension section and the rear lower inner extension section extend into the high-pressure chamber;

[0017] The front partition is installed in the concave part of the rear end surface of the second upper casing segment and the second lower casing segment; the rear partition is installed in the concave part of the rear end surface of the third upper casing segment and the third lower casing segment; the middle partition is installed on the rear upper inner extension segment and the rear lower inner extension segment.

[0018] Specifically, a high-pressure chamber water injection port is provided on the top of the second upper casing segment, and a high-pressure chamber water inlet joint is installed at the high-pressure chamber water injection port; a high-pressure chamber pressure gauge joint is installed on the top of the third upper casing segment; a low-pressure chamber water injection port is provided on the top of the fourth upper casing segment, and a low-pressure chamber water inlet joint is installed at the low-pressure chamber water injection port; a low-pressure chamber pressure gauge joint is installed on the top of the fourth upper casing segment.

[0019] Specifically, an air inlet is provided at the bottom end of the second lower casing section, and a front air inlet sealing pressure plate is installed at the air inlet; an air outlet is provided at the bottom end of the fourth lower casing section, and a rear air outlet sealing pressure plate is installed at the air outlet; a middle section sealing flange is installed on the third lower casing section.

[0020] Specifically, execution windows are provided on both sides of the third upper casing segment, and window sealing flanges are installed at the execution windows; positioning holes are provided on both sides of the third lower casing segment, and the positioning holes are axially opposite to the execution windows, and positioning hole sealing flanges are installed at the positioning holes.

[0021] Specifically, the structures of the front baffle and the rear baffle are the same; the front baffle comprises a baffle cover plate and a baffle pressure plate arranged in sequence from front to back along the axial direction of the lightweight blast furnace gas residual pressure recovery turbine casing.

[0022] Specifically, the middle partition includes a front inner cavity pull plate, a middle inner cavity pressure plate and a rear inner cavity pull plate which are arranged in sequence from front to back along the axial direction of the lightweight blast furnace gas waste pressure recovery turbine casing. The front inner cavity pull plate is located in the high-pressure cavity, and the rear inner cavity pull plate is located in the low-pressure cavity; the front inner cavity pull plate, the middle inner cavity pressure plate and the rear inner cavity pull plate are fixed to the inner wall of the lightweight blast furnace gas waste pressure recovery turbine casing by cover nuts.

[0023] The method specifically comprises the following steps:

[0024] Step 1: Assemble the upper casing;

[0025] Install the high-pressure chamber water inlet connector, high-pressure chamber pressure gauge connector, low-pressure chamber water inlet connector, and low-pressure chamber pressure gauge connector on the upper casing to complete the assembly of the upper casing;

[0026] Step 2: Assemble the lower housing;

[0027] Install the front air inlet sealing plate, rear air inlet sealing plate and middle sealing flange on the lower casing to complete the assembly of the lower casing;

[0028] Step 3: Preparation before the test;

[0029] After completing the assembly of the upper casing in step 1 and the lower casing in step 2, point the air inlet and outlet downward and prop up the lower casing. After assembling the front, middle, and rear partitions, hoist them into and install them in the lower casing. Lift the upper casing and assemble it with the lower casing. Tighten the nuts for installing the front, middle, and rear partitions. Finally, install the window sealing flange and the positioning hole sealing flange to complete the preparations for the test.

[0030] Step 4: After completing the pre-test preparations in step 3, fill the high-pressure chamber and the low-pressure chamber with water and perform a water pressure test in each chamber by applying multiple pressures in a stepped manner.

[0031] Step 5: After completing the water pressure test of the sub-cavity in step 4, release the pressure and pump out the water.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects:

[0033] (I) The method for testing the sub-cavity water pressure of the lightweight blast furnace gas residual pressure recovery turbine casing of the present invention adopts a stepped multiple-pressurization method to avoid the phenomenon of severe deformation of the casing or even water leakage caused by one-time pressurization, thereby realizing the water pressure test of the lightweight blast furnace gas residual pressure recovery turbine casing.

[0034] (II) Since lightweight design brings about strength changes and different inlet and outlet pressures, in order to meet the different water pressure test pressure requirements of different parts in the shell, the present invention designs front baffles, middle baffles and rear baffles to keep the high-pressure chamber and the low-pressure chamber sealed and independent of each other, so that the same shell can simultaneously meet the pressure requirements of 0.3MPa and 0.14MPa chamber water pressure tests, and meets the technical requirement of no leakage at any part of the shell within 30 minutes of pressure maintenance.

[0035] (III) The present invention realizes the sealing of the high-pressure chamber and the low-pressure chamber by designing the front air outlet sealing pressure plate, the rear air outlet sealing pressure plate, the middle section sealing flange, the window sealing flange, the positioning hole sealing flange and the matching sealing ring, thereby ensuring that no water leakage occurs during the water pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of the chamber hydraulic test device for the lightweight blast furnace gas excess pressure recovery turbine casing.

[0037] Figure 2 This is a cross-sectional view of the AA surface of the chamber hydraulic test device for the lightweight blast furnace gas excess pressure recovery turbine casing.

[0038] Figure 3This is a structural diagram of the front inner cavity pull plate.

[0039] Figure 4 Schematic diagram of the structure of the middle inner cavity pressure plate.

[0040] Figure 5 It is a structural diagram of a cap nut.

[0041] Figure 6 This is the B-direction view of the cap nut.

[0042] The meanings of the numbers in the figure are: 1-upper casing, 2-lower casing, 3-front partition, 4-middle partition, 5-rear partition, 6-front transition chamber, 7-high-pressure chamber, 8-low-pressure chamber, 9-rear transition chamber, 10-high-pressure chamber water inlet connector, 11-high-pressure chamber pressure gauge connector, 12-low-pressure chamber water inlet connector, 13-low-pressure chamber pressure gauge connector, 14-front air outlet sealing pressure plate, 15-rear air outlet sealing pressure plate, 16-middle section sealing flange, 17-cap nut, 18-window sealing flange, 19-positioning hole sealing flange, 20-sealing ring, 21-bolt;

[0043] 102 - second upper casing section, 103 - third upper casing section, 108 - high-pressure chamber water injection port, 109 - low-pressure chamber water injection port, 110 - execution window;

[0044] 201-first lower casing segment, 202-second lower casing segment, third lower casing segment 203-, 204-fourth lower casing segment, 205-fifth lower casing segment, 206-front lower inner extension segment, 207-rear lower inner extension segment, 208-air inlet, 209-air outlet, 210-positioning hole;

[0045] 301-partition cover plate, 302-partition pressure plate;

[0046] 401-front inner cavity pull plate, 402-middle inner cavity pressure plate, 403-rear inner cavity pull plate.

[0047] The technical solution of the present invention is further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0048] The lightweight blast furnace gas excess pressure recovery turbine casing of the present invention belongs to a horizontally split continuous casting bearing box structure, and its air inlet and air outlet are both rectangular. The tooling medium of the casing is gas. According to industry standards, in order to test the strength and quality of the casing, the casing must be subjected to a water pressure test. The different parts of the lightweight blast furnace gas excess pressure recovery turbine casing are subjected to different pressures, with a high pressure on the air inlet side and a low pressure on the exhaust side. In order to reduce the manufacturing cost of the casing, the present invention has carried out a lightweight design for the casing. Compared with the traditional casing, its wall thickness is thinner by 30%, and the length of the tie rod at the wind tube is shortened by 50%.

[0049] It should be noted that, unless otherwise specified, all components used in the present invention are components known in the art.

[0050] In the present invention:

[0051] Lightweight means that the casing of the blast furnace gas waste pressure recovery turbine is thinner.

[0052] All flanges are equipped with corresponding sealing rings 20.

[0053] All flanges, joints and pressure plates are fixedly installed by bolts 21.

[0054] Pressure refers to the pressure measured by the pressure gauge, not the absolute pressure.

[0055] In accordance with the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0056] Example 1:

[0057] This embodiment provides a lightweight blast furnace gas residual pressure recovery turbine casing, such as Figure 1 As shown, it includes an upper casing 1 and a lower casing 2;

[0058] The upper casing 1 includes, from front to back, a first upper casing segment, a second upper casing segment 102, a third upper casing segment 103, a fourth upper casing segment, and a fifth upper casing segment, which are integrally arranged in sequence. The front end surface of the second upper casing segment 102 is an inwardly concave semi-arc surface, and the rear end surface of the second upper casing segment 102 is a flat surface. The front end surface of the fourth upper casing segment is a flat surface, and the rear end surface of the fourth upper casing segment is an inwardly concave semi-arc surface.

[0059] A front upper inner extension section is provided at the connection between the second upper casing section 102 and the third upper casing section 103, and a rear upper inner extension section is provided at the connection between the third upper casing section 103 and the fourth upper casing section; both the front upper inner extension section and the rear upper inner extension section extend into the high-pressure chamber 7;

[0060] The lower housing 2 includes a first lower housing segment 201, a second lower housing segment 202, a third lower housing segment 203, a fourth lower housing segment 204, and a fifth lower housing segment 205, which are integrally arranged from front to back. The front end surface of the fourth lower housing segment 204 is a flat surface, and the rear end surface of the fourth lower housing segment 204 is an inwardly concave semi-arc surface.

[0061] A front lower inner extension section 206 is provided at the connection between the second lower casing section 202 and the third lower casing section 203, and a rear lower inner extension section 207 is provided at the connection between the third lower casing section 203 and the fourth lower casing section 204. Both the front lower inner extension section 206 and the rear lower inner extension section 207 extend into the high-pressure chamber 7.

[0062] The front partition 3 is installed in the concave part of the rear end surface of the second upper casing section 102 and the second lower casing section 202; the rear partition 5 is installed in the concave part of the rear end surface of the third upper casing section 103 and the third lower casing section 203; the middle partition 4 is installed on the rear upper inner extension section and the rear lower inner extension section 207.

[0063] In this embodiment, the first upper casing segment and the first lower casing segment 201 have the same structure, and the fifth upper casing segment and the fifth lower casing segment 205 have the same structure.

[0064] As a specific solution of this embodiment, Figure 1 As shown, a high-pressure chamber water injection port 108 is provided on the top of the second upper casing section 102, and a high-pressure chamber water inlet joint 10 is installed at the high-pressure chamber water injection port 108; a high-pressure chamber pressure gauge joint 11 is installed on the top of the third upper casing section 103; a low-pressure chamber water injection port 109 is provided on the top of the fourth upper casing section, and a low-pressure chamber water inlet joint 12 is installed at the low-pressure chamber water injection port 109; a low-pressure chamber pressure gauge joint 13 is installed on the top of the fourth upper casing section.

[0065] In this embodiment, the high-pressure chamber water injection port 108 and the low-pressure chamber water injection port 109 are used to introduce water into the high-pressure chamber 7 and the low-pressure chamber 8, respectively; the high-pressure chamber water inlet joint 10 and the low-pressure chamber water inlet joint 12 are used to connect an external water supply device; the high-pressure chamber pressure gauge joint 11 and the low-pressure chamber pressure gauge joint 13 are used to connect pressure gauges for measuring the high-pressure chamber 7 and the low-pressure chamber 8, respectively.

[0066] As a specific solution of this embodiment, Figure 1 As shown, an air inlet 208 is provided at the bottom end of the second lower casing section 202, and a front air inlet sealing pressure plate 14 is installed at the air inlet 208; an air outlet 209 is provided at the bottom end of the fourth lower casing section 204, and a rear air inlet sealing pressure plate 15 is installed at the air outlet 209; a middle section sealing flange 16 is installed on the third lower casing section 203.

[0067] In this embodiment, the chamber water pressure test device of the lightweight blast furnace gas residual pressure recovery turbine casing also includes a square box and a support seat for support; during the chamber water pressure test, the square box and the support seat are used to support the entire test device so that there is a certain gap between the air inlet 208 and the air outlet 209 and the ground.

[0068] As a specific solution of this embodiment, Figure 2As shown, execution windows 110 are defined on both sides of the third upper housing section 103, and window sealing flanges 18 are installed at execution windows 110. Positioning holes 210 are defined on both sides of the third lower housing section 203, and are axially opposed to execution windows 110. Positioning hole sealing flanges 19 are installed at positioning holes 210. Execution windows 110 and positioning holes 210 facilitate installation by operators.

[0069] Example 2:

[0070] This embodiment provides a lightweight blast furnace gas residual pressure recovery turbine casing chamber water pressure test device, such as Figure 1 As shown, it includes the lightweight blast furnace gas excess pressure recovery turbine casing of Example 1;

[0071] The axial ends of the lightweight blast furnace gas waste pressure recovery turbine casing are open, and the space inside the lightweight blast furnace gas waste pressure recovery turbine casing is the casing cavity; the front partition 3, the middle partition 4 and the rear partition 5 are installed on the inner wall of the lightweight blast furnace gas waste pressure recovery turbine casing from front to back, and the front partition 3, the middle partition 4 and the rear partition 5 divide the casing cavity into four independent and non-interconnected cavities, which are the front transition chamber 6, the high-pressure chamber 7, the low-pressure chamber 8 and the rear transition chamber 9 from front to back, and the high-pressure chamber 7 and the low-pressure chamber 8 are closed spaces.

[0072] As a specific solution of this embodiment, Figure 1 As shown, the front baffle 3 and the rear baffle 5 have the same structure; the front baffle 3 includes a baffle cover plate 301 and a baffle pressure plate 302 arranged in sequence from front to back along the axial direction of the lightweight blast furnace gas residual pressure recovery turbine casing.

[0073] As a specific solution of this embodiment, Figures 3 to 6 As shown, the middle partition 4 includes a front inner cavity pull plate 401, a middle inner cavity pressure plate 402 and a rear inner cavity pull plate 403 which are arranged in sequence from front to back along the axial direction of the lightweight blast furnace gas excess pressure recovery turbine casing. The front inner cavity pull plate 401 is located in the high-pressure chamber 7, and the rear inner cavity pull plate 403 is located in the low-pressure chamber 8; the front inner cavity pull plate 401, the middle inner cavity pressure plate 402 and the rear inner cavity pull plate 403 are fixed to the inner wall of the lightweight blast furnace gas excess pressure recovery turbine casing by cover nuts 17.

[0074] In this embodiment, the diameter of the inner cavity of the casing is about 1500 mm, and the pressure plate is prone to deformation and leakage. By assembling the front inner cavity pull plate 401, the middle inner cavity pressure plate 402, the rear inner cavity pull plate 403 and the matching gaskets in the inner cavity of the casing, and then equipping them with cover nuts and matching gaskets, the sealing of the middle inner cavity pressure plate 402 is improved to meet the requirements of the chamber test.

[0075] Example 3:

[0076] This embodiment provides a method for a sub-chamber hydraulic pressure test of a lightweight blast furnace gas excess pressure recovery turbine casing. The method employs a stepwise, multiple-pressurization method to pressurize the high-pressure chamber 7 and the low-pressure chamber 8 of the sub-chamber hydraulic pressure test apparatus for the lightweight blast furnace gas excess pressure recovery turbine casing of Example 2. The method specifically comprises the following steps:

[0077] Step 1: Assemble the upper housing 1;

[0078] Install the high-pressure chamber water inlet connector 10, the high-pressure chamber pressure gauge connector 11, the low-pressure chamber water inlet connector 12, and the low-pressure chamber pressure gauge connector 13 on the upper casing 1 to complete the assembly of the upper casing 1;

[0079] Step 2: assemble the lower housing 2;

[0080] Place the lower casing 2 in the pit, install the front air inlet sealing plate 14, the rear air inlet sealing plate 15 and the middle sealing flange 16 on the lower casing 2, and complete the assembly of the lower casing 2;

[0081] Step 3: Preparation before the test;

[0082] After completing the assembly of the upper housing 1 in step 1 and the lower housing 2 in step 2, place the air inlet 208 and air outlet 209 downward on the box horizontally, and set support bases around the lower housing 2 to prop it up. After assembling the front partition 3, middle partition 4, and rear partition 5, hoist them into and install them in the lower housing 2.

[0083] Lift the upper housing 1 and assemble it with the lower housing 2. Tighten the center split bolts. The operator inserts his hand into the housing cavity through the execution window 110, tightens the nuts used to install the front spacer 3, the middle spacer 4, and the rear spacer 5, and then removes his hand from the execution window 110. Finally, install the window sealing flange 18, the positioning hole sealing flange 19, and the remaining peripheral flange plates to complete the preparations for the test.

[0084] Step 4: After completing the pre-test preparations in step 3, fill the high-pressure chamber 7 and the low-pressure chamber 8 with water and perform a water pressure test in each chamber by applying multiple pressures in a stepped manner.

[0085] Step 4.1: First, apply high pressure to the high-pressure chamber 7 once, with a pressure of 0.1 MPa, and wait for 5 minutes to observe the pressure changes in the high-pressure chamber 7 and the low-pressure chamber 8;

[0086] Step 4.2: Continue to increase the pressure of the high-pressure chamber 7 for the second time. The pressure of the second high-pressure chamber is 0.15 MPa. Stay for 5 minutes and observe the pressure changes of the high-pressure chamber 7 and the low-pressure chamber 8.

[0087] In step 4.3, continue to increase the pressure of the high-pressure chamber 7 three times, with the pressure of the three high-pressure additions being 0.2 MPa. At the same time, increase the pressure of the low-pressure chamber 8 once, with the pressure of the one low-pressure addition being 0.05 MPa. Stay for 5 minutes and observe the pressure changes in the high-pressure chamber 7 and the low-pressure chamber 8.

[0088] In step 4.4, the high-pressure chamber 7 is continuously pressurized four times, with the pressure of the four times being 0.23 MPa. At the same time, the low-pressure chamber 8 is pressurized twice, with the pressure of the two times being 0.07 MPa. Stay for 5 minutes and observe the pressure changes in the high-pressure chamber 7 and the low-pressure chamber 8.

[0089] In step 4.5, the pressure of the low-pressure chamber 8 remains unchanged, and the high-pressure chamber 7 is continuously pressurized five times, with the pressure of the five pressurizations being 0.25 MPa. Stay for 5 minutes and observe the pressure changes of the high-pressure chamber 7 and the low-pressure chamber 8.

[0090] In step 4.6, the pressure of the low-pressure chamber 8 remains unchanged, and the high-pressure chamber 7 is continuously pressurized six times, with the pressure of the six pressurizations being 0.27 MPa. The pressure is kept for 5 minutes, and the pressure changes of the high-pressure chamber 7 and the low-pressure chamber 8 are observed.

[0091] In step 4.7, the pressure of the low-pressure chamber 8 remains unchanged, and the high-pressure chamber 7 is continuously pressurized seven times, with the pressure of the seven pressurizations being 0.28 MPa. The pressure is kept for 5 minutes, and the pressure changes of the high-pressure chamber 7 and the low-pressure chamber 8 are observed.

[0092] In step 4.8, the pressure of the low-pressure chamber 8 remains unchanged, and the high-pressure chamber 7 is continuously pressurized eight times, with the pressure of the eight pressurizations being 0.29 MPa. Stay for 5 minutes and observe the pressure changes of the high-pressure chamber 7 and the low-pressure chamber 8.

[0093] In step 4.9, continue to apply high pressure to the high-pressure chamber 7 nine times, with the pressure of the nine times of high pressure being 0.3 MPa. At the same time, apply low pressure to the low-pressure chamber 8 three times, with the pressure of the three times of low pressure being 0.14 MPa. Stay for 5 minutes, maintain the pressure for 30 minutes, and observe the pressure changes in the high-pressure chamber 7 and the low-pressure chamber 8.

[0094] Step 5: After completing the water pressure test of the sub-cavity in step 4, release the pressure and pump out the water.

Claims

1. A method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing, characterized in that: Adopting a step-by-step multiple pressurization method, the high-pressure chamber (7) and the low-pressure chamber (8) of the divided-chamber water pressure test device of the lightweight blast furnace gas residual pressure recovery turbine casing are pressurized; The specific process of the step-by-step multiple pressurization is as follows: the high-pressure chamber (7) is pressurized once and twice; the high-pressure chamber (7) is pressurized three times, and the low-pressure chamber (8) is pressurized once while the high-pressure chamber (7) is pressurized three times; the high-pressure chamber (7) is pressurized four times, and the low-pressure chamber (8) is pressurized twice while the high-pressure chamber (8) is pressurized four times; then the pressure of the low-pressure chamber (8) remains unchanged, and the high-pressure chamber (7) is pressurized five times, six times, seven times, and eight times in sequence; the high-pressure chamber (7) is pressurized nine times, and the low-pressure chamber (8) is pressurized three times. The sub-cavity hydraulic pressure test device for a lightweight blast furnace gas excess pressure recovery turbine casing comprises a lightweight blast furnace gas excess pressure recovery turbine casing; The axial ends of the lightweight blast furnace gas excess pressure recovery turbine casing are open, and the space inside the lightweight blast furnace gas excess pressure recovery turbine casing is the casing cavity; the inner wall of the lightweight blast furnace gas excess pressure recovery turbine casing is sequentially installed with a front partition (3), a middle partition (4) and a rear partition (5) from front to back, and the front partition (3), the middle partition (4) and the rear partition (5) divide the casing cavity into four independent non-interconnected cavities, which are sequentially arranged from front to back as a front transition chamber (6), a high-pressure chamber (7), a low-pressure chamber (8) and a rear transition chamber (9), and the high-pressure chamber (7) and the low-pressure chamber (8) are closed spaces; The lightweight blast furnace gas excess pressure recovery turbine casing comprises an upper casing (1) and a lower casing (2); The upper casing (1) comprises a first upper casing segment, a second upper casing segment (102), a third upper casing segment (103), a fourth upper casing segment and a fifth upper casing segment which are integrally arranged in sequence from front to back; the front end surface of the second upper casing segment (102) is an inwardly concave semi-arc surface, and the rear end surface of the second upper casing segment (102) is a plane; the front end surface of the fourth upper casing segment is a plane, and the rear end surface of the fourth upper casing segment is an inwardly concave semi-arc surface; A front upper inner extension section is provided at the connection between the second upper casing section (102) and the third upper casing section (103), and a rear upper inner extension section is provided at the connection between the third upper casing section (103) and the fourth upper casing section; both the front upper inner extension section and the rear upper inner extension section extend into the high-pressure chamber (7); The lower casing (2) comprises a first lower casing segment (201), a second lower casing segment (202), a third lower casing segment (203), a fourth lower casing segment (204) and a fifth lower casing segment (205) which are integrally arranged in sequence from front to back; the front end surface of the fourth lower casing segment (204) is a plane, and the rear end surface of the fourth lower casing segment (204) is an inwardly concave semi-arc surface; A front lower inner extension section (206) is provided at the connection between the second lower casing section (202) and the third lower casing section (203), and a rear lower inner extension section (207) is provided at the connection between the third lower casing section (203) and the fourth lower casing section (204); both the front lower inner extension section (206) and the rear lower inner extension section (207) extend into the high-pressure chamber (7); The front partition (3) is installed in the concave portion of the rear end surface of the second upper casing section (102) and the second lower casing section (202); the rear partition (5) is installed in the concave portion of the rear end surface of the third upper casing section (103) and the third lower casing section (203); and the middle partition (4) is installed on the rear upper inner extension section and the rear lower inner extension section (207).

2. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 1, characterized in that: The pressure of the first low pressure application is 0.05MPa; the pressure of the second low pressure application is 0.07MPa; the pressure of the third low pressure application is 0.14MPa; The pressure of the first high pressure is 0.1MPa; the pressure of the second high pressure is 0.15MPa; the pressure of the third high pressure is 0.2MPa; the pressure of the fourth high pressure is 0.23MPa; the pressure of the fifth high pressure is 0.25MPa; the pressure of the sixth high pressure is 0.27MPa; the pressure of the seventh high pressure is 0.28MPa; the pressure of the eighth high pressure is 0.29MPa; and the pressure of the ninth high pressure is 0.3MPa.

3. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 1, characterized in that: A high-pressure chamber water injection port (108) is provided on the top of the second upper casing section (102), and a high-pressure chamber water inlet joint (10) is installed at the high-pressure chamber water injection port (108); a high-pressure chamber pressure gauge joint (11) is installed on the top of the third upper casing section (103); a low-pressure chamber water injection port (109) is provided on the top of the fourth upper casing section, and a low-pressure chamber water inlet joint (12) is installed at the low-pressure chamber water injection port (109); a low-pressure chamber pressure gauge joint (13) is installed on the top of the fourth upper casing section.

4. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 3, characterized in that: The bottom end of the second lower casing section (202) is provided with an air inlet (208), and a front air inlet sealing pressure plate (14) is installed at the air inlet (208); the bottom end of the fourth lower casing section (204) is provided with an air outlet (209), and a rear air inlet sealing pressure plate (15) is installed at the air outlet (209); and a middle section sealing flange (16) is installed on the third lower casing section (203).

5. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 4, characterized in that: The third upper casing section (103) is provided with execution windows (110) on both sides, and the execution windows (110) are installed with window sealing flanges (18); the third lower casing section (203) is provided with positioning holes (210) on both sides, and the positioning holes (210) are axially arranged opposite to the execution windows (110), and the positioning hole sealing flanges (19) are installed at the positioning holes (210).

6. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 5, characterized in that: The front baffle (3) and the rear baffle (5) have the same structure; the front baffle (3) comprises a baffle cover plate (301) and a baffle pressure plate (302) arranged in sequence from front to back along the axial direction of the lightweight blast furnace gas residual pressure recovery turbine casing.

7. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 5, characterized in that: The middle partition (4) includes a front inner cavity pull plate (401), a middle inner cavity pressure plate (402) and a rear inner cavity pull plate (403) which are arranged in sequence from front to back along the axial direction of the lightweight blast furnace gas excess pressure recovery turbine casing, the front inner cavity pull plate (401) is located in the high-pressure chamber (7), and the rear inner cavity pull plate (403) is located in the low-pressure chamber (8); the front inner cavity pull plate (401), the middle inner cavity pressure plate (402) and the rear inner cavity pull plate (403) are fixed to the inner wall of the lightweight blast furnace gas excess pressure recovery turbine casing through cover nuts (17).

8. The method for testing the sub-cavity hydraulic pressure of a lightweight blast furnace gas residual pressure recovery turbine casing according to claim 6, characterized in that: The method specifically comprises the following steps: Step 1: assembling the upper housing (1); Install the high-pressure chamber water inlet connector (10), the high-pressure chamber pressure gauge connector (11), the low-pressure chamber water inlet connector (12), and the low-pressure chamber pressure gauge connector (13) on the upper casing (1) to complete the assembly of the upper casing (1); Step 2: assembling the lower housing (2); Install the front air inlet sealing plate (14), the rear air inlet sealing plate (15) and the middle sealing flange (16) on the lower casing (2) to complete the assembly of the lower casing (2); Step 3: Preparation before the test; After completing the assembly of the upper housing (1) in step 1 and the assembly of the lower housing (2) in step 2, the air inlet (208) and the air outlet (209) are facing downward, and the lower housing (2) is propped up; after assembling the front partition (3), the middle partition (4) and the rear partition (5), they are hoisted into and installed in the lower housing (2); hoisting the upper housing (1), assembling the upper housing (1) and the lower housing (2), tightening the nuts used for installing the front partition (3), the middle partition (4) and the rear partition (5), and finally installing the window sealing flange (18) and the positioning hole sealing flange (19), completing the preparations before the test; Step 4: After completing the pre-test preparations in step 3, fill the high-pressure chamber (7) and the low-pressure chamber (8) with water, and perform a water pressure test in each chamber by applying multiple pressures in a stepped manner; Step 5: After completing the water pressure test of the sub-cavity in step 4, release the pressure and pump out the water.

Images