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- Product Details
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- Product Brand: Tianjin Blower
- Total Supply: Unlimited
- Price Description: Negotiated
- Packing instructions: unlimited
- Logistics Description: Freight and Logistics
- Delivery instructions: by order
- Valid until: long-term validity
Quick repair of high temperature fan impeller
Fast repair of cement high temperature fan impeller An Guangxian, Yang Weichen (Lunan Cement Co., Ltd., Tengzhou 277531, Shandong) produced 2300t / d). The ventilator was put into production in 1990 and 1991, respectively. Two high temperature fans have been running smoothly. The impeller has never been repaired or replaced. During the routine inspection in June 2004, it was found that the blade of the No. 2 fan impeller wears out a large gap. When it runs to September, the fan has a large vibration, and it often reports alarms and trips. Shutdown inspection found that the blade wear is extremely bad. Cannot continue operation. Therefore, it was decided to carry out emergency repair without disassembling the impeller on site. It only took more than 60 hours from shutdown to resume operation, reducing accident losses.
1 Brief introduction of high temperature fan 1600-6; Rated speed 995r / min; Rated power 1600kW; Hydraulic coupler model YOTC-1000; Output power 610 ~ 1800kW. 2 Construction preparation (determined by the size of the original fan blade); J557 welding electrode 20kg; 3 bottles of oxygen;
One angle grinder and one portable vibration measuring instrument (set); six dynamic balance test blocks.
3 Construction method Cut the maintenance square hole directly on the casing without dismantling the casing, which can allow one person to sit on the casing and contact the impeller for maintenance operations to speed up the construction. After the construction is completed, it will be restored as it is.
According to the on-site impeller wear, draw a cutting line on the blade, and cut off all the thinned and worn parts of the blade. Use an angle grinder to polish the surroundings of the incision to remove debris such as welding slag and burrs to facilitate the next welding work.
Cut the blade spare parts according to the size of the cut blade. The three sides of the spare steel plate contacting the impeller shall be ground to a single-sided groove.
Welding adopts cold welding method and DC reverse connection. Master well during welding. Pay attention to fill the arc pit when the electrode is closed. Use an angle grinder on the back to carefully remove the roots. After confirming that there are no defects, repeat the above steps to weld the back. After welding, the skin must be carefully removed and must be removed.
The personnel left the inspection square hole and started the motor after confirming the safety.
The hydraulic coupler slowly adjusts the impeller speed from low to high, and uses a vibrometer to measure the horizontal and vertical vibration values of the two bearing blocks, respectively. The rotation speed is stable for 30 minutes at 200, 400, 600, 800, 900, and 950 r / min, and the bearing vibration value and temperature rise are recorded.
During the speed-up operation, if the vibration value exceeds the limit, the speed-up should be stopped immediately and the operation should be stable, and the vibration value and the vibration direction should be measured to determine the positioning position of the balance weight.
The above steps need to be repeated until each vibration value is within the standard allowable range. Finally, the vibration value of No. 2 high-temperature fan is: at the impeller speed of 930r / min, the horizontal vibration of the transmission side bearing is 1.2mm / s, and the vertical vibration is 0.8mm / s; the horizontal vibration of the non-drive side bearing is 1.1mm / s, and the vertical vibration is 0.8mm / s, Tianjin fan which is good, fully in line with regulations.
The square hole was restored for maintenance, and the rotary kiln was ignited and put into production smoothly. The production of high and high temperature fans runs smoothly. The online vibration meter shows that when the rotary kiln feeds 152t / h and the impeller speed is 845r / min, the horizontal vibration of the transmission side bearing is 100 | JLm, the vertical vibration is 50 | xm; the horizontal vibration of the non-drive side bearing is 90 | xm, vertical vibration 46 | xm, fully meets production needs.
4 Attentions During maintenance, the scribe cutting of the impeller blade, grinding of the impeller notch, preparation of blade spare parts, and welding of the blade are completed by one person to ensure the uniformity of the processing volume. If it can't be done by one person, at least one process should be done by one person.
The impeller must be carefully cleaned up before the dynamic balance of the impeller, including the crusts, ash deposits, welding slag, and coating on the impeller to ensure the authenticity of the dynamic balance. this point is very important.
If conditions permit, the dynamic balance test shall be performed with an on-site dynamic balance instrument. This saves time and improves accuracy.
The fan has been running smoothly after repair, and the operating rate is above 95%.
During the planned inspection in January 2005, it was found that the weld seams were still clearly visible, almost no wear was observed, and it was determined that they could run for a long time. From this point of view, this method can be used for both emergency repairs and regular planned maintenance to reduce maintenance costs and time.
Welding speed, can fill the weld seam once, try to make the welding material fill evenly b
In order to prevent the high temperature fan main shaft from bending due to high temperature, the following points must be done:
1. Develop a central control operation work instruction to standardize operations and strictly control the process and technical parameters
range. That is, the temperature and negative pressure of the flue gas at the outlet of the kiln end preheater C1 can be adjusted normally, and the flue gas temperature at the outlet of the C1 can is strictly controlled to be less than 430 ° C.
2. Formulate emergency plans for failures. Fan manufacturers should ensure that the generators are put into use in a timely manner when the power fails;
3. After stopping the kiln, the C1 cylinder maintenance door should be opened in time for forced cooling, and the inspection must be in place.
4. Add a flue gas temperature detector to the high temperature fan inlet, which is convenient for central control operation.
5. Make sure that the auxiliary transmission device immediately merges and starts when the main transmission cannot be started, so that high temperature wind
The machine can rotate at high temperature to ensure uniform heating of the impeller and the main shaft.
The negative pressure at the outlet of the high-temperature fan increases to ensure that the impeller of the high-temperature fan can rotate.
Fan manufacturers, Jin blowers, and fans are provided by Jin Blower Group Co., Ltd. Tianjin Blower Group Co., Ltd. (fuzzlinks.com) 's high-quality services and products have been continuously affirmed and trusted by new and old customers and industry professionals. Our company is a certified member of the Shangmeng League. Click the Shangmeng customer service icon on the page to directly talk to our customer service staff. I hope our future cooperation is happy!
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