Synchronous scraping adjusting device and method for TRT radial tile and thrust tile

Abstract

The invention relates to a TRT radial tile and thrust tile synchronous scraping adjusting device which comprises a generator, a generator shaft, a generator side coupler, a turbine rotor half coupler, a turbine left bearing bush, a left bearing base, a rotor shaft, an impeller, a turbine right bearing bush, a thrust tile, a thrust disc and a right bearing base. The generator is connected with the turbine rotor half coupling through a generator shaft and a generator side coupling, the turbine rotor comprises a rotor shaft, the turbine rotor half coupling is installed on the left side of the rotor shaft, and the rotor shaft is provided with an impeller. The installation of the TRT rotor is efficiently completed, and different gaskets are selected for adjustment, so that the rotor installation is rapidly completed. After the rotor is installed, the parallelism and the deviation value in the diameter direction of the two half couplings are both within 0.05 mm; the parallelism of the thrust disc and the thrust pad is within 0.02 mm, and the contact area of the thrust pad and the radial pad is more than 70%.

Description

Technical Field

[0001] The invention relates to an adjustment device, in particular to a synchronous scraping and grinding adjustment device for a TRT radial bush and a thrust bush, belonging to the technical field of mechanical structures. Background Art

[0002] TRT——(Blast Furnace Top Gas Recovery Turbine Unit, hereinafter referred to as TRT) Blast furnace gas waste pressure turbine power generation unit (ie TRT) utilizes the pressure energy and thermal energy of blast furnace top gas, a by-product of blast furnace smelting, to make the gas work through a turbine expander, convert it into mechanical energy, and then convert the mechanical energy into electrical energy. The blast furnace gas waste pressure turbine power generation unit is a recovery device that utilizes the pressure energy of blast furnace gas to drive the generator through turbine expansion work. It is an auxiliary equipment of the blast furnace system. The characteristics of waste pressure power generation determine that the output of the generator cannot be adjusted according to the needs of the load, but can only be adjusted according to the changes in the blast furnace operating conditions. Under the premise of ensuring the stability of the blast furnace top pressure, as much power is generated as possible, and the output changes with the fluctuation of the blast furnace top pressure.

[0003] The gas and pressure of the blast furnace gas turbine main engine are not high, but the flow rate is quite large. Although it has been dusted many times, it still contains a lot of ash particles and the water vapor is saturated. Therefore, the turbine design cannot completely adopt the gas turbine method, but is specially designed with new design methods such as large flow area, low circumferential speed, and straight and thick blade shape. The gas generated by the blast furnace enters the TRT device through the gravity dust collector. Through the inlet electric butterfly valve, inlet plug valve, speed regulating valve, and quick-cut valve, the turbine expands and works to drive the generator to generate electricity. The gas coming out of the turbine enters the low-pressure pipeline network and is connected in parallel with the pressure reducing valve group in the gas system. The generator outlet circuit breaker is connected to the 10KV system busbar and connected to the power grid through the local substation. When the TRT is running, the generator sends power to the power grid. When the blast furnace is shut down for a short period of time, the generator is not disconnected and operates electrically.

[0004] The installation accuracy of the generator and the exciter on the free side of the generator is required to be high. During the rotor alignment process, the generator end is usually used as the fixed end and the turbine as the adjustment end to complete the coupling alignment. Radial bearings and thrust bearings are installed in the free side bearing seat of the blast furnace TRT turbine. For this reason, when adjusting the radial bearing to complete the alignment, the contact area between the thrust bearing and the thrust plate will be destroyed; similarly, when adjusting the contact area between the thrust plate and the thrust bearing, the contact area between the radial bearing and the rotor shaft will be affected. During the installation of the TRT rotor, an effective method for quickly adjusting the radial bearing and the thrust bearing is needed to complete the high-quality installation of the TRT rotor. Summary of the invention

[0005] The present invention is aimed at the problems existing in the prior art and provides a device for adjusting the synchronous scraping of TRT radial pads and thrust pads. In this scheme, in view of the characteristics that both the radial pads and the thrust pads need to be adjusted during the installation of the rotor in the same bearing base, a method for adjusting the synchronous scraping of TRT radial pads and thrust pads is provided. This method can quickly and simultaneously adjust the contact between the radial pad and the shaft, and the thrust pad and the thrust plate, so as to efficiently complete the installation of the TRT rotor.

[0006] In order to achieve the above-mentioned purpose, the scheme of the present invention is as follows: a TRT radial pad and thrust pad synchronous scraping adjustment device, the adjustment device includes a generator, a generator shaft, a generator side coupling, a turbine rotor half coupling, a turbine left bearing, a left bearing base, a rotor shaft, an impeller, a turbine right bearing, a thrust pad, a thrust plate and a right bearing base, the generator is connected to the turbine rotor half coupling through the generator shaft and the generator side coupling, the turbine rotor includes a rotor shaft, the turbine rotor half coupling is installed on the left side of the rotor shaft, the rotor shaft is provided with an impeller, the rotor shaft with the impeller passes through the turbine left bearing and the turbine right bearing in the left and right bearing seats, and the free side of the shaft is provided with a thrust plate, when the turbine rotor is working, a left axial thrust is generated, and the thrust plate bears the axial thrust through the thrust pad installed in the right bearing seat; the right bearing and the thrust pad are both installed in the right bearing base. Wherein, the adjustment device also includes a bearing seat lower gasket and a radial bearing seat gasket, the bearing seat lower gasket is located between the bearing seat and the ground, and the radial bearing seat gasket is located between the bearing shell and the bearing seat.

[0007] A method for adjusting the synchronous scraping of a TRT radial pad and a thrust pad, using the adjustment device, the method comprising the following steps:

[0008] Step 1: With the generator side coupling as the reference, set up the dial gauge bracket, press the dial gauge needle on the axial and radial directions of the turbine side half coupling, rotate the generator and turbine rotor synchronously, and record the maximum axial and radial differences x1 and y1 of the two couplings after one rotation;

[0009] Step 2: Use a block gauge (or an inside micrometer) to measure the parallelism of the axial plane between the rotor thrust plate and the thrust pad seat, and record the maximum difference x3 between the thrust pad radial direction and the thrust plate plane axial direction;

[0010] Step 3: Measure the distances a1 and a2 between the coupling and the left and right bearings of the turbine; measure the diameter d of the coupling; Step 4: Calculate the right bearing adjustment x2 = x1*a2 / d;

[0011] Step 5: Compare the difference between x1 and x3. If the difference is less than 0.08mm, the adjustment measure is to adjust the gasket 14 under the radial bushing, and the adjustment cycle is relatively short. If the difference is greater than 0.08mm, the adjustment measure is to adjust the gasket 13 under the right bearing seat, and the entire right bearing seat locating pin is changed, and the adjustment cycle is relatively long.

[0012] Step 6: After adjusting the position of the bearing seat, turn the rotor and open it to check if there are any red contact points on the bearing surface. Scrape the babbitt alloy on the radial bearing surface several times until the contact area is more than 70% and there are no less than 12 points within the range of 20*20mm;

[0013] Step 7: Pre-coat the thrust bearing surface with red lead, add a preload of 1 / 3 of the shaft weight to the right end of the turbine rotor, continue to rotate the rotor, and check after loosening it that there are no red contact bright spots on the bearing surface. Scrape the babbitt alloy on the thrust bearing surface several times until the contact area is more than 70% and there are no less than 12 points within the range of 20*20mm;

[0014] Step 8: After scraping and grinding the radial bearing and thrust bearing, realign them and repeat the above steps until the radial and opening degrees between the two coupling halves are less than 0.05mm after gauge measurement.

[0015] This proposal proposes a thrust bearing scraping method. A jack is used to pre-apply an axial force of 1 / 3 of the rotor weight to the shaft head at the shaft end. This can effectively pre-grind the contact spots between the bearing and the thrust plate, greatly reducing the time for scraping the thrust bearing on site. The maximum and minimum position difference between the thrust bearing and the thrust plate diameter is less than 0.08mm. A scraper is used to scrape the bearing surface with babbitt alloy until the contact area is 70%. If the maximum and minimum position difference between the thrust bearing and the thrust plate diameter is greater than 0.08mm, the difference is adjusted to less than 0.08mm by adjusting the gasket. 0.08mm is proposed as a gasket for adjusting the bearing seat and the base. Combined with the thrust bearing scraping time, the best on-site maintenance model is given. The time for centering, radial bearing and thrust bearing scraping on the rotor installation site is reduced to achieve economical maintenance.

[0016] Compared with the prior art, the present invention has the following advantages: the technical solution is applied to the rotor centering of TRT and the synchronous scraping and adjustment of the radial bearing and thrust bearing in the same bearing seat. It provides a reliable installation model for on-site TRT rotor installation, greatly saves on-site maintenance time, increases TRT power generation, and has good economic benefits. It ensures the stability of blast furnace gas top pressure and ensures the safe production of blast furnaces. The pressure energy and thermal energy of blast furnace gas, a by-product of blast furnace smelting, are utilized to convert the gas into electrical energy through turbine machinery, thereby ensuring the cleanliness of the gas, reducing pipeline corrosion, and ensuring the life of the gas pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the TRT shaft system in an example of the present invention.

[0018] In the figure: 1, motor, 2, generator shaft, 3, generator side coupling, 4, turbine rotor half coupling, 5, turbine left bearing, 6, left bearing base, 7, rotor shaft, 8, impeller, 9, turbine right bearing, 10, thrust bearing, 11, thrust plate, 12, right bearing base. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0020] Example 1: See Figure 1 A TRT radial pad and thrust pad synchronous scraping adjustment device, the adjustment device includes a generator 1, a generator shaft 2, a generator side coupling 3, a turbine rotor half coupling 4, a turbine left bearing 5, a left bearing base 6, a rotor shaft 7, an impeller 8, a turbine right bearing 9, a thrust pad 10, a thrust plate 11 and a right bearing base 12. The generator is connected to the turbine rotor half coupling 4 through the generator shaft 2 and the generator side coupling 3. The turbine rotor includes a rotor shaft 7, a turbine rotor half coupling 4 is installed on the left side of the rotor shaft 7, and an impeller 8 is provided on the rotor shaft 7. The rotor shaft with the impeller passes through the turbine left bearing 5 and the turbine right bearing 9 in the left and right bearing seats, and a thrust plate 10 is provided on the free side of the shaft. When the turbine rotor is working, a leftward axial thrust is generated, and the thrust plate bears the axial thrust through the thrust pad installed in the right bearing seat. The right bearing 9 and the thrust pad 10 are both installed in the right bearing base 12.

[0021] The adjustment device further comprises a bearing seat lower gasket 13 and a radial bearing seat gasket 14. The bearing seat lower gasket 13 is located between the bearing seat and the ground, and the radial bearing seat gasket 14 is located between the bearing shell and the bearing seat.

[0022] like Figure 1 As shown, when TRT is working, the high-temperature and high-pressure gas generated in the blast furnace production process passes through the turbine impeller 8, driving the impeller to rotate and do work. The impeller drives the rotor to rotate at 3000rad / min, and the rotor drives the generator rotor to rotate through the coupling to complete power generation. The pressure energy and thermal energy of the blast furnace gas generated by blast furnace smelting are used to make the gas pass through the turbine expander to do work, convert it into mechanical energy, and then convert the mechanical energy into electrical energy.

[0023] The turbine rotor and the generator rotor are connected by two half couplings. The centering requirement between the two half couplings is that the deviation between the opening and the center line should be less than 0.05mm. The TRT system adjustment is based on the generator rotor. It is necessary to adjust the height and left and right positions of the radial bearings supporting the turbine rotor to meet the parallelism and position deviation requirements of the two couplings. When adjusting the position of the right radial bearing, the position of the rotor thrust plate will change, resulting in a deterioration in the parallelism between the rotor thrust plate and the thrust bearing. The thrust bearing and radial bearing are both installed in the right bearing base. It is necessary to propose a method to coordinate the position of the radial bearing and thrust bearing during the centering installation process.

[0024] Example 2: See Figure 1 A method for adjusting the synchronous scraping of a TRT radial pad and a thrust pad, using the adjustment device, the method comprises the following steps:

[0025] Step 1: With the generator side coupling as the reference, set up the dial gauge bracket, press the dial gauge needle on the axial and radial directions of the turbine side half coupling, rotate the generator and turbine rotor synchronously, and record the maximum axial and radial differences x1 and y1 of the two couplings after one rotation;

[0026] Step 2: Use a block gauge (or an inside micrometer) to measure the parallelism of the axial plane between the rotor thrust plate and the thrust pad seat, and record the maximum difference x3 between the thrust pad radial direction and the thrust plate plane axial direction;

[0027] Step 3: Measure the distances a1 and a2 between the coupling and the turbine left bearing 5 and the turbine right bearing 9; and measure the coupling diameter d;

[0028] Step 4: Calculate the right bearing adjustment x2 = x1*a2 / d;

[0029] Step 5: Compare the difference between x1 and x3. If the difference is less than 0.08mm, the adjustment measure is to adjust the gasket 14 under the radial bushing, and the adjustment cycle is relatively short. If the difference is greater than 0.08mm, the adjustment measure is to adjust the gasket 13 under the right bearing seat, and the entire right bearing seat locating pin is changed, and the adjustment cycle is relatively long.

[0030] Step 6: After adjusting the position of the bearing seat, turn the rotor and open it to check if there are any red contact points on the bearing surface. Scrape the babbitt alloy on the radial bearing surface several times until the contact area is more than 70% and there are no less than 12 points within the range of 20*20mm;

[0031] Step 7: Pre-coat the thrust bearing surface with red lead, add a preload of 1 / 3 of the shaft weight to the right end of the turbine rotor, continue to rotate the rotor, and check after loosening it that there are no red contact bright spots on the bearing surface. Scrape the babbitt alloy on the thrust bearing surface several times until the contact area is more than 70% and there are no less than 12 points within the range of 20*20mm;

[0032] Step 8: After scraping and grinding the radial bearing and thrust bearing, realign them and repeat the above steps until the radial and opening degrees between the two coupling halves are less than 0.05mm after gauge measurement.

[0033] Working principle and process: refer to Figure 1 In order to achieve the above purpose, the technical solution of the present invention is as follows: using the different application characteristics of the gasket under the bearing seat and the gasket under the radial pad seat, according to the difference in the centering values ​​of the two half couplings, different gaskets are selected for adjustment to quickly complete the rotor installation. After the rotor is installed, the parallelism and diameter deviation values ​​of the two half couplings are within 0.05mm; the parallelism of the thrust plate and the thrust pad is within 0.02mm, and the contact area between the thrust pad and the radial pad is more than 70%.

[0034] The TRT device consists of eight major systems: turbine main engine, large valve system, lubricating oil system, hydraulic servo system, water supply and drainage system, nitrogen sealing system, high / low power distribution system, and automatic control system. The turbine main engine consists of stator, rotor, adjustable stator blade, bearing, base, etc. Bearing: The radial bearing adopts a four-oil-blade sliding bearing structure, and the thrust bearing adopts Kingsberry type. The thrust surface consists of 12 tiles and is lubricated by forced oil supply. The electro-hydraulic servo control system is a subsystem of one of the eight major systems in the TRT device. According to the instructions of the main control room, the system control of TRT start and stop, speed control, power control, furnace top pressure and process detection is realized. To realize the functional control of the above systems, it will eventually be reflected in the control of the speed of the turbine. It is necessary to control the opening of the turbine stator blade, and the means of controlling the opening of the stator blade is the electro-hydraulic position servo system. The accuracy and error of the control system directly affect the control of each stage of the TRT system. It can be seen that the status and role of this system in TRT are very important.

[0035] This device is connected with the turbine rotor half coupling by the generator shaft and coupling. The turbine rotor includes a rotor shaft, a half coupling is installed on the left side of the shaft, and an impeller is provided on the shaft. The shaft with the impeller is supported by radial pads in the left and right bearing seats, and a thrust plate is provided on the free side of the shaft. When the turbine rotor is working, an axial thrust to the left is generated, and the thrust plate bears the axial thrust through the thrust pad installed in the right bearing seat.

[0036] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A TRT radial pad and thrust pad synchronous scraping and adjustment device, characterized in that: The adjustment device includes a generator, a generator shaft, a generator side coupling, a turbine rotor half coupling, a turbine left bearing, a left bearing base, a rotor shaft, an impeller, a turbine right bearing, a thrust bearing, a thrust plate and a right bearing base. The generator is connected to the turbine rotor half coupling through the generator shaft and the generator side coupling. The turbine rotor includes a rotor shaft. The turbine rotor half coupling is installed on the left side of the rotor shaft. The rotor shaft is provided with an impeller. The rotor shaft with the impeller passes through the turbine left bearing and the turbine right bearing in the left and right bearing seats. The free side of the shaft is provided with a thrust plate. The right bearing and the thrust bearing are both installed in the right bearing base.

2. The TRT radial pad and thrust pad synchronous scraping and adjustment device according to claim 1 is characterized in that: The adjustment device also includes a bearing seat lower gasket and a radial bush seat gasket. The bearing seat lower gasket is located between the bearing seat and the ground, and the radial bush seat gasket is located between the bearing bush and the bearing seat.

3. A method for synchronously scraping and adjusting a TRT radial pad and a thrust pad, characterized in that: Using the adjustment device according to claim 1 or 2, the method comprises the following steps: Step 1: With the generator side coupling as the reference, set up the dial gauge bracket, press the dial gauge needle on the axial and radial directions of the turbine side half coupling, rotate the generator and turbine rotor synchronously, and record the maximum axial and radial differences x1 and y1 of the two couplings after one rotation; Step 2: Use a block gauge to measure the parallelism of the axial plane between the rotor thrust plate and the thrust pad seat, and record the maximum difference x3 between the thrust pad radial direction and the thrust plate plane axial direction; Step 3: Measure the distances a1 and a2 between the coupling and the left and right bearings of the turbine; measure the diameter d of the coupling; Step 4: Calculate the right bearing adjustment x2 = x1*a2 / d; Step 5: Compare the difference between x1 and x3. If the difference is less than 0.08mm, the adjustment measure is to adjust the gasket under the radial bushing, and the adjustment cycle is relatively short. If the difference is greater than 0.08mm, the adjustment measure is to adjust the gasket under the right bearing seat, and the entire right bearing seat locating pin is changed, and the adjustment cycle is relatively long. Step 6: After adjusting the position of the bearing seat, turn the rotor, open it and check that there is no red contact bright spot on the tile surface, scrape the babbitt alloy on the radial tile surface several times until the contact area is more than 70% and there are no less than 12 points within the range of 20*20mm; Step 7: Pre-coat the thrust bearing surface with red lead, add a preload of 1 / 3 of the shaft weight to the right end of the turbine rotor, continue to rotate the rotor, loosen it and check that there are no red contact bright spots on the bearing surface, scrape and grind the thrust bearing surface babbitt alloy several times until the contact area is more than 70% and there are no less than 12 points within the range of 20*20mm; Step 8: After scraping and grinding the radial bearing and thrust bearing, realign them and repeat the above steps until the radial and opening degrees between the two coupling halves are less than 0.05mm after gauge measurement.

4. The TRT radial pad and thrust pad synchronous scraping and adjustment method according to claim 3 is characterized in that: In step 7, use a jack at the shaft end to pre-apply an axial force of 1 / 3 of the rotor weight to the shaft head, which can effectively pre-grind the contact spots between the bearing and the thrust plate.

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