Steam seal gap measuring tool and steam seal gap adjusting method

Abstract

The invention discloses a steam seal clearance measuring tool and a steam seal clearance adjusting method, and solves the problem that the existing steam seal clearance test of a steam turbine is time-consuming and labor-consuming. Comprising a cylinder inner partition plate (1), a steam sealing block embedded T-shaped groove (2) is formed in the cylinder inner partition plate, an I-shaped steam sealing block (3) is movably arranged in the steam sealing block embedded T-shaped groove, and a left side gap (9) is formed between the outer side face of the left side of the I-shaped steam sealing block and the inner side face of the cylinder inner partition plate. A right side gap (10) is formed between the outer side face of the right side of the I-shaped steam seal block and the inner side face of the cylinder inner partition plate (1), a left wedge block (11) is inserted into the left side gap, a right wedge block (12) is movably inserted into the right side gap (10), and the structure of the left wedge block is completely the same as that of the right wedge block; the number of times of repeated testing and detection of the steam seal gap in the later period is greatly reduced, and the working efficiency of steam gap adjustment is improved.

Description

Technical Field

[0001] The invention relates to a steam turbine of a thermal power plant, in particular to a steam seal gap measuring tool and a steam seal gap measuring and adjusting method used in assembling a steam turbine unit of a thermal power plant. Background Art

[0002] The steam turbine body is mainly composed of four parts: rotor, stator, bearing and bearing box, and turning device; the rotor is the rotating part in the flow of the steam turbine, and is composed of main components such as main shaft, blades, couplings, etc. The rotors of the steam turbine, as well as the turbine rotor and the generator rotor are connected by couplings to transmit torque and axial force; the stator is the stationary part in the flow of the steam turbine and the turbine casing, and is composed of cylinder, partition and partition sleeve, steam inlet part, exhaust part, steam seal and shaft seal and other components. Among them, the cylinder is the outer shell of the steam turbine, and the nozzle chamber, nozzle, partition, partition sleeve and steam seal and other components are installed inside, and the regulating steam valve and steam inlet, exhaust and oil return pipelines are installed outside; the function of the steam seal is to separate the flow part of the steam turbine from the atmosphere to form a closed steam chamber to ensure that the steam completes its energy conversion process in the steam turbine. When the steam turbine is running, the rotor rotates at high speed and the stator is fixed. Therefore, a certain pressure must be maintained between the rotor and the stator. When the steam flows through the various poles of the steam turbine, the pressure and temperature drop step by step. There is a pressure difference on both sides of the partition. In addition to the vast majority of the steam flowing through the channels of the guide vanes and moving blades to do work, a small part will flow through the gaps without doing work, which becomes a loss and reduces the efficiency of the steam turbine. The rotor shaft must also pass through the cylinder and be supported on the bearing. A gap must also be left here. For both ends of the high and medium pressure cylinders, the steam pressure in the cylinder is greater than the atmospheric pressure, and the steam will leak out, reducing the efficiency and causing some condensate loss. At both ends of the low-pressure cylinder, because the steam pressure in the cylinder is lower than the external atmospheric pressure, air will leak into the cylinder in the gap where the main shaft passes through the cylinder. In order to reduce the steam leakage in the above-mentioned gaps (or air leakage from the outside) and to ensure the normal and safe operation of the steam turbine, various steam seals are specially set up. These steam seals can be divided into three categories: circulation part steam seals, partition steam seals, and cylinder front and rear steam seals.

[0003] The steam seal is a mechanism installed between the dynamic and static parts of the steam turbine to reduce or prevent steam leakage and air leakage on the vacuum side. Taking the 300MW unit as an example, the equipment layout of the steam turbine unit is the front box, high and medium pressure cylinders, middle box, low pressure cylinder, and low pressure rear box from the head side. Each bearing box and low pressure cylinder are located on the foundation plate. The extended cat claws of the high and medium pressure cylinders are placed on the bearing box respectively. The rotor is supported by the bearing shell located on the bearing box. The bearing shell is plated with tungsten gold (thickness of about 3 mm) to protect the rotor and steam seal from damage and wear in the event of a turbine accident. There are multi-stage partitions in the cylinder, and end steam seals are installed on the front and rear sides of the cylinder. The partitions and end steam seals are divided into upper and lower halves. The upper and lower half steam seals are composed of 3 steam seal blocks, namely the left, right and bottom steam seal blocks. A steam turbine unit has nearly 60 circles of partition steam seals and end steam seals, a total of There are 360 ​​steam seal blocks, which are clamped in the steam seal body groove by springs, and the steam seal body groove is set on the cylinder; each level of partition steam seal and end steam seal are arranged with high and low teeth, which mesh with the low and high teeth of the rotor to form a steam seal gap, which is generally required to be 0.25±0.10 mm; in the assembly of the steam turbine, whether the steam seal gap is adjusted accurately directly affects the thermal efficiency of the steam turbine; steam seal gap adjustment is one of the key and difficult points in the installation and maintenance of the steam turbine; the steam seal block is clamped in the steam seal body groove by springs and elastically fixed, and the steam seal block can retreat, and the retreat gap is generally 3-4 mm; before measuring the steam seal gap, the steam seal block must be evenly lifted and fixed, and it cannot retreat and rebound, so that the steam seal gap can be accurately measured; that is, a wooden wedge must be embedded in the retreat space of the steam seal block in the steam seal body groove to lift and fix the steam seal block, so that the steam seal gap can be measured.

[0004] Steam seal clearance adjustment is one of the important difficulties in turbine installation and maintenance. Before measuring the steam seal clearance, the spring of the steam seal block needs to be removed and then lifted up with a wooden wedge or other process tooling, that is, the steam seal block needs to be evenly fixed and lifted up, so that the steam seal clearance can be accurately measured and the steam seal clearance can be judged based on the measured data. Otherwise, the unqualified steam seal needs to be scraped and adjusted, and the measurement and adjustment are repeated until it is qualified. There are many steam seal blocks and the space is small. Therefore, evenly fixing and lifting the steam seal block is an important construction process with the largest workload and the most difficult technology in the process of steam seal clearance measurement and adjustment. The traditional method of testing and adjusting the steam seal clearance has the following problems: (1) The thickness of the wooden wedges produced has deviation and poor consistency. (2) In the process of embedding the wooden wedges in the retreat space of the steam seal block, the steam seal block is prone to unevenness. (3) A large number of wooden wedges need to be made each time the test is repeated, resulting in increased labor and material costs. (4) Repeated testing is time-consuming and labor-intensive. Summary of the invention

[0005] The invention provides a steam seal gap measuring tool and a steam seal gap adjusting method used in assembling a steam turbine, solving the technical problem of time-consuming and labor-intensive steam seal gap testing of the existing steam turbine.

[0006] The present invention solves the above technical problems through the following technical solutions: A steam seal clearance measuring tool comprises a cylinder inner partition plate, a steam seal block is arranged on the cylinder inner partition plate and embedded in a T-shaped groove, an I-shaped steam seal block is movably arranged in the steam seal block embedded in the T-shaped groove, a stator steam seal low teeth and a stator steam seal high teeth are respectively arranged on the inner side surface of the I-shaped steam seal block, a rotor is arranged on the inner side of the I-shaped steam seal block, a rotor steam seal high teeth and a rotor steam seal low teeth are respectively arranged on the rotor, the stator steam seal low teeth and the rotor steam seal high teeth are correspondingly meshed and arranged, and the stator steam seal high teeth and the rotor steam seal low teeth are correspondingly meshed and arranged, a left gap is formed between the left outer side surface of the I-shaped steam seal block and the inner side surface of the cylinder inner partition plate, a right gap is formed between the right outer side surface of the I-shaped steam seal block and the inner side surface of the cylinder inner partition plate, a left wedge block is inserted in the left gap, and a right wedge block is movably inserted in the right gap, and the structure of the left wedge block is exactly the same as that of the right wedge block.

[0007] After the left wedge block is inserted into the left gap and the right wedge block is movably inserted into the right gap, the I-shaped steam seal block is fixed and cannot retreat to the T-shaped groove to embed the steam seal block. The spacing T1 between the stator steam seal high teeth set on the left side of the inner side surface of the I-shaped steam seal block and the corresponding meshing rotor steam seal low teeth is equal to the spacing T2 between the steam seal high teeth set on the right side of the inner side surface of the I-shaped steam seal block and the corresponding meshing rotor steam seal low teeth.

[0008] The spacing T1 between the high teeth of the stator steam seal arranged on the left side of the inner side surface of the I-shaped steam seal block and the corresponding meshing low teeth of the rotor steam seal is 0.15 mm-0.35 mm; the width of the left gap is 3-4 mm.

[0009] The left wedge block is in the shape of a right triangle, comb teeth are arranged at equal intervals on the hypotenuse of the left wedge block, and a scale ruler for the height of each comb tooth is arranged on the front side elevation of the left wedge block.

[0010] A method for adjusting a steam seal gap, characterized by comprising the following steps: The first step is to place the bearing box and lower cylinder of the steam turbine unit on the workbench; Step 2: Check whether the inner diaphragm (sleeve) and steam seal (sleeve) of the upper and lower cylinders of the steam turbine unit are intact. If they are intact, remove the fixing springs of the I-shaped steam seal blocks in the upper and lower cylinders, and take out each I-shaped steam seal block from the corresponding T-shaped groove of the steam seal block. Check whether the I-shaped steam seal block has oil stains, and whether the edges of the steam seal teeth are flat and curled; Step 3: Install the I-shaped steam seal block and the fixing spring back into the steam seal block and embed it into the T-shaped groove; Step 4: Insert the left wedge-shaped block of the right triangle into the left gap, and insert the right wedge-shaped block of the right triangle into the right gap, so that the I-shaped steam seal block protrudes outward and the I-shaped steam seal block cannot retreat into the T-shaped groove of the steam seal block; Step 5: Determine the comb teeth on the left wedge block that are in contact with the left outer side surface of the I-shaped steam seal block, and read the reading of the comb teeth on the scale ruler, which is the width of the left gap; determine the comb teeth on the right wedge block that are in contact with the right outer side surface of the I-shaped steam seal block, and read the reading of the comb teeth on the scale ruler, which is the width of the right gap; Step 6. Compare the width of the left gap obtained in step 5 with the width of the right gap. If the two readings are not equal, remove the I-shaped steam seal block from the T-shaped groove and perform processing and repair. Then, repeat the above steps from step 3 to step 6 until the width of the left gap is equal to the width of the right gap, and the left gap is 3 mm-4 mm. Step 7. A layer of adhesive tape is applied on the steam cover of the low teeth of each stator steam seal of the upper cylinder and the lower cylinder, as well as on the steam cover of the high teeth of the stator steam seal. The thickness of the adhesive tape is 0.25 mm. Step 8: Apply red lead powder on the steam cover of the high teeth of the rotor steam seal and the steam cover of the low teeth of the rotor steam seal. The width of the red lead powder is 100 mm. Step 9: Assemble the rotor of the steam turbine unit into the bearing box of the steam turbine unit, and buckle the upper cylinder and the lower cylinder together; Step 10: Press the turbine's rotation steering wheel to move the rotor to rotate 360 ​​degrees; Step 11. Disassemble the upper cylinder and lift out the rotor, and check the condition of the tapes on each steam seal: if there is light red lead powder on the tape, it means that the steam seal tooth and the rotor are slightly in contact, and the steam seal gap of the steam seal tooth is qualified; if there is dark red lead powder on the tape or the tape is cut, it means that the steam seal gap of the steam seal tooth is too small, and the corresponding I-shaped steam seal block position needs to be adjusted; if there is no trace of red lead powder on the tape, it means that the steam seal gap of the steam seal tooth is too large, and the corresponding I-shaped steam seal block position needs to be adjusted.

[0011] The tooling of the present invention is simple and easy to operate, and can evenly fix and lift up the steam seal block of the steam turbine in the steam seal block groove to obtain accurate steam seal clearance of the steam turbine; through the tooling of the right-angled triangular wedge block with a height scale, the purpose of evenly lifting up the steam seal block is achieved, and the gap width readings on both sides after the steam seal block is completely lifted up can be read at a glance, which is convenient for comparison with the design value, and unqualified steam seal blocks are repaired in time before turbine assembly, which greatly reduces the number of times that the steam seal clearance needs to be repeatedly tested and detected in the later stage, and improves the working efficiency of the steam gap adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] The present invention is described in detail below in conjunction with embodiments: A steam seal clearance measuring tool used in assembling a steam turbine comprises a cylinder inner partition 1, a steam seal block embedded in a T-shaped groove 2 is arranged on the cylinder inner partition 1, an I-shaped steam seal block 3 is movably arranged in the steam seal block embedded in the T-shaped groove 2, an outer T-shaped end of the I-shaped steam seal block 3 is movably embedded in the steam seal block embedded in the T-shaped groove 2, a spring is arranged between the outer T-shaped end and the steam seal block embedded in the T-shaped groove 2, and the spring floats the I-shaped steam seal block 3 on the inner side of the cylinder inner partition 1; a stator steam seal low tooth 4 and a stator steam seal high tooth 5 are respectively arranged on the inner side surface of the I-shaped steam seal block 3, a rotor 6 of the steam turbine unit is arranged on the inner side of the I-shaped steam seal block 3, a rotor steam seal high tooth 7 and a rotor steam seal low tooth 8 are respectively arranged on the rotor 6, and the stator steam seal low tooth 4 and the rotor steam seal high tooth 7 are correspondingly meshed The stator steam seal high teeth 5 and the rotor steam seal low teeth 8 are correspondingly meshed, so as to realize the steam sealing of the gap in the cylinder. A left gap 9 is formed between the left outer side surface of the I-shaped steam seal block 3 and the inner side surface of the partition 1 in the cylinder, and a right gap 10 is formed between the right outer side surface of the I-shaped steam seal block 3 and the inner side surface of the partition 1 in the cylinder. The left gap 9 and the right gap 10 are the gaps for the I-shaped steam seal block 3 to retreat into the T-shaped groove 2 when the steam seal block is embedded; a left wedge block 11 is inserted in the left gap 9, and a right wedge block 12 is movably inserted in the right gap 10, and the structure of the left wedge block 11 is exactly the same as that of the right wedge block 12; when the two wedge blocks are tightly inserted into the gaps on both sides, the left gap 9 and the right gap 10 are the maximum gaps that the I-shaped steam seal block 3 can protrude inward.

[0014] After the left wedge block 11 is inserted into the left gap 9 and the right wedge block 12 is movably inserted into the right gap 10, the I-shaped steam seal block 3 is fixed and cannot retreat to the T-shaped groove 2 to embed the steam seal block. The spacing T1 between the stator steam seal high teeth 5 set on the left side of the inner side surface of the I-shaped steam seal block 3 and the corresponding meshing rotor steam seal low teeth 8 is equal to the spacing T2 between the steam seal high teeth 5 set on the right side of the inner side surface of the I-shaped steam seal block 3 and the corresponding meshing rotor steam seal low teeth 8; T1 equals T2, which means that the two sides of the I-shaped steam seal block 3 protrude evenly and belong to a qualified steam seal block. Otherwise, it needs to be scraped and repaired.

[0015] The spacing T1 between the stator steam seal high teeth 5 and the corresponding meshing rotor steam seal low teeth 8 arranged on the left side of the inner side surface of the I-shaped steam seal block 3 is 0.15 mm-0.35 mm; the width of the left gap 9 is 3-4 mm to ensure that after the 3 mm tungsten gold coating plated on the bearing shell is worn off, the steam seal teeth on the stator and the steam seal teeth on the mover will not be scratched.

[0016] The left wedge block 11 is in the shape of a right triangle, with comb teeth arranged at equal intervals on the hypotenuse of the left wedge block 11, and a scale ruler 13 for the height of each comb tooth is arranged on the front side elevation of the left wedge block 11. The scale ruler 13 indicates the vertical distance height of the corresponding comb teeth on the wedge block, that is, the width of the left gap 9 after the I-shaped steam seal block 3 is completely protruded from the steam seal block and embedded in the T-shaped groove 2. Based on these two readings, it can be determined whether the I-shaped steam seal block 3 needs to be repaired.

[0017] A method for adjusting a steam seal gap, characterized by comprising the following steps: The first step is to place the bearing box and lower cylinder of the steam turbine unit on the workbench; Step 2: Check whether the inner diaphragm (sleeve) and steam seal (sleeve) of the upper and lower cylinders of the steam turbine unit are intact. If they are intact, remove the fixing springs of the I-shaped steam seal blocks 3 in the upper and lower cylinders, and take out each I-shaped steam seal block 3 from the corresponding steam seal block embedded in the T-shaped groove 2, check whether there is oil stain on the I-shaped steam seal block 3, and whether the edge of the steam seal tooth is flat and has no curling phenomenon. If there is no oil stain and the edge of the steam seal tooth is intact, proceed to the next step; Step 3: Install the I-shaped steam seal block 3 and the fixing spring back into the steam seal block and embed it into the T-shaped groove 2; Step 4: insert the right-angled triangle left wedge block 11 into the left gap 9, and insert the right-angled triangle right wedge block 12 into the right gap 10, so that the I-shaped steam seal block 3 protrudes outward and the I-shaped steam seal block 3 cannot retreat into the T-shaped groove 2 where the steam seal block is embedded, completely simulating the normal working state of the I-shaped steam seal block 3 in the cylinder; Step 5: Determine the comb teeth on the left wedge block 11 that are connected to the left outer side of the I-shaped steam seal block 3, and read the reading of the comb teeth on the scale ruler 13, which is the width of the left gap 9; determine the comb teeth on the right wedge block 12 that are connected to the right outer side of the I-shaped steam seal block 3, and read the reading of the comb teeth on the scale ruler 13, which is the width of the right gap 10, and determine whether the two widths are consistent, whether they are between 3-4 mm; Step 6: Compare the width of the left gap 9 obtained in step 5 with the width of the right gap 10. If the two readings are not equal, remove the I-shaped steam seal block 3 from the steam seal block embedded in the T-shaped groove 2 and then perform processing and repair. Then, repeat the above steps from step 3 to step 6 until the width of the left gap 9 is equal to the width of the right gap 10, and the left gap 9 is 3 mm-4 mm. The above steps realize the preliminary adjustment of the steam seal gap, and basically realize the preliminary adjustment of the steam seal gap in place. Then, the following assembly of the upper cylinder, the rotor and the lower cylinder is carried out, which greatly saves the working time of the steam gap adjustment; Step 7: A layer of adhesive tape is pasted on the steam surface of each stator steam seal low gear 4 of the upper cylinder and the lower cylinder, and on the steam surface of the stator steam seal high gear 5, and the thickness of the adhesive tape is 0.25 mm; Step 8: Apply red lead powder on the steam sealing surface of the rotor steam seal high teeth 7 and the steam sealing surface of the rotor steam seal low teeth 8 of the rotor, and the width of the red lead powder is 100 mm; Step 9: Assemble the rotor of the steam turbine unit into the bearing box of the steam turbine unit, and buckle the upper cylinder and the lower cylinder together; Step 10: Press the turbine's rotation steering wheel to move the rotor to rotate 360 ​​degrees; Step 11. Disassemble the upper cylinder and lift out the rotor to check the tape on each steam seal: If there is light red lead powder on the tape, it means that the steam seal tooth and the rotor are slightly in contact, and the steam seal gap of the steam seal tooth is qualified; if there is dark red lead powder on the tape or the tape is cut, it means that the steam seal gap of the steam seal tooth is too small, and the corresponding I-shaped steam seal block 3 position needs to be adjusted; if there is no trace of red lead powder on the tape, it means that the steam seal gap of the steam seal tooth is too large, and the corresponding I-shaped steam seal block 3 position needs to be adjusted; The unqualified steam seal gaps detected in the above steps will be very limited, accounting for a limited number of the hundreds of steam seal gaps. It is only necessary to repair the I-shaped steam seal blocks 3 corresponding to these limited steam seal gaps.

Claims

1. A steam seal clearance measuring tool for assembling a steam turbine, comprising a cylinder inner partition (1), a steam seal block embedded in a T-shaped groove (2) is arranged on the cylinder inner partition (1), an I-shaped steam seal block (3) is movably arranged in the steam seal block embedded in the T-shaped groove (2), a stator steam seal low teeth (4) and a stator steam seal high teeth (5) are respectively arranged on the inner side surface of the I-shaped steam seal block (3), a rotor (6) is arranged on the inner side of the I-shaped steam seal block (3), a rotor steam seal high teeth (7) and a rotor steam seal low teeth (8) are respectively arranged on the rotor (6), the stator steam seal low teeth (4) and the rotor steam seal high teeth (7) are correspondingly meshed, and the stator steam seal high teeth (5) and the rotor steam seal low teeth (8) are correspondingly meshed, characterized in that: A left gap (9) is formed between the left outer side surface of the I-shaped steam seal block (3) and the inner side surface of the cylinder inner partition (1), and a right gap (10) is formed between the right outer side surface of the I-shaped steam seal block (3) and the inner side surface of the cylinder inner partition (1). A left wedge-shaped block (11) is inserted into the left gap (9), and a right wedge-shaped block (12) is movably inserted into the right gap (10). The structure of the left wedge-shaped block (11) is exactly the same as that of the right wedge-shaped block (12).

2. The steam seal gap measuring tool for assembling a steam turbine according to claim 1, characterized in that: After the left wedge block (11) is inserted into the left gap (9) and the right wedge block (12) is movably inserted into the right gap (10), the I-shaped steam seal block (3) is fixed and cannot be retracted into the T-shaped groove (2) to embed the steam seal block, and the spacing T1 between the stator steam seal high teeth (5) arranged on the left side of the inner side surface of the I-shaped steam seal block (3) and the corresponding meshing rotor steam seal low teeth (8) is equal to the spacing T2 between the steam seal high teeth (5) arranged on the right side of the inner side surface of the I-shaped steam seal block (3) and the corresponding meshing rotor steam seal low teeth (8).

3. The steam seal gap measuring tool for assembling a steam turbine according to claim 2, characterized in that: The spacing T1 between the stator steam seal high teeth (5) arranged on the left side of the inner side surface of the I-shaped steam seal block (3) and the corresponding meshing rotor steam seal low teeth (8) is 0.15 mm to 0.35 mm; the width of the left gap (9) is 3 to 4 mm.

4. A steam seal gap measuring tool for assembling a steam turbine according to claim 1, 2 or 3, characterized in that: The left wedge-shaped block (11) is in the shape of a right triangle, comb teeth are arranged at equal intervals on the hypotenuse of the left wedge-shaped block (11), and a scale (13) indicating the height of each comb tooth is arranged on the front side elevation of the left wedge-shaped block (11).

5. A method for adjusting the steam seal gap by using a steam seal gap measuring tool when assembling a steam turbine according to claim 4, characterized in that The following steps are involved: The first step is to place the bearing box and lower cylinder of the steam turbine unit on the workbench; Step 2: Check whether the inner diaphragms (sleeves) and steam seals (sleeves) of the upper and lower cylinders of the steam turbine unit are intact. If they are intact, remove the fixing springs of the I-shaped steam seal blocks (3) in the upper and lower cylinders, and take out each I-shaped steam seal block (3) from the corresponding steam seal block T-shaped groove (2). Check whether there is oil on the I-shaped steam seal block (3) and whether the edges of the steam seal teeth are flat and free of curling. Step 3: Install the I-shaped steam seal block (3) and the fixing spring back into the steam seal block and embed it into the T-shaped groove (2); Step 4: insert the right triangle shaped left wedge block (11) into the left gap (9), and insert the right triangle shaped right wedge block (12) into the right gap (10), so that the I-shaped steam seal block (3) protrudes outward and the I-shaped steam seal block (3) cannot retreat into the T-shaped groove (2) of the steam seal block; Step 5: Determine the comb teeth on the left wedge block (11) that are in contact with the left outer side surface of the I-shaped steam seal block (3), and read the reading of the comb teeth on the scale ruler (13), which is the width of the left gap (9); determine the comb teeth on the right wedge block (12) that are in contact with the right outer side surface of the I-shaped steam seal block (3), and read the reading of the comb teeth on the scale ruler (13), which is the width of the right gap (10); Step 6. Compare the width of the left gap (9) obtained in step 5 with the width of the right gap (10). If the two readings are not equal, remove the I-shaped steam seal block (3) from the steam seal block embedded in the T-shaped groove (2) and perform processing and repair. Then, repeat the above steps from step 3 to step 6 until the width of the left gap (9) is equal to the width of the right gap (10), and the left gap (9) is 3 mm to 4 mm. Step 7: A layer of adhesive tape is affixed on the steam surface of the low teeth (4) of each stator steam seal of the upper cylinder and the lower cylinder, and on the steam surface of the high teeth (5) of the stator steam seal. The thickness of the adhesive tape is 0.25 mm. Step 8: Apply red lead powder on the steam cover of the rotor steam seal high teeth (7) and the steam cover of the rotor steam seal low teeth (8) of the rotor, and the width of the red lead powder is 100 mm; Step 9: Assemble the rotor of the steam turbine unit into the bearing box of the steam turbine unit, and buckle the upper cylinder and the lower cylinder together; Step 10: Press the turbine's rotation steering wheel to move the rotor to rotate 360 ​​degrees; Step 11. Disassemble the upper cylinder and lift out the rotor to check the tape on each seal surface. If there is light red lead on the tape, it means that the seal tooth is slightly in contact with the rotor and the seal gap of the seal tooth is qualified. If there is dark red lead on the tape or the tape is cut, it means that the seal gap of the seal tooth is too small and the corresponding I-shaped seal block (3) needs to be adjusted. If there is no trace of red lead on the tape, it means that the seal gap of the seal tooth is too large and the corresponding I-shaped seal block (3) needs to be adjusted.

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