Coke oven flue gas system is the main induced draft fan assembly and lubrication failure cases

Coke oven flue gas system, the main 2020 - induced draft fan assembly and lubrication failure cases 08 - 21 shanxi LuAn ring to coal tar chemical co. , LTD Wang Jintao & 2020 times; Month & times; Day at 3 am 50 points a company of coke oven flue gas desulfurization denitration device in the system during hot commissioning, equipment matching 1 set of power 2800 kw, design flow rate of 900000 m & sup3; / h suddenly appeared during the operation of main induced draft fan vibration value is big, the phenomenon of bearing housing and bearing temperature rise sharply, central operator on duty emergency notification on-site inspection work view, on-site inspection personnel preliminary judgment induced draft fan bearing box bearing failure, random reporting the EPC contractor for leadership and technical personnel on duty for emergency disposal, later to disassemble/repair the unit fan found, induced draft fan bearing box bearing wear serious, after replace new bearing processing again put into operation, the entire downtime repair process takes about 10 hours. One, the occurrence of the incident: 2020 & times; Month & times; Day at 3 am 50 points of coke oven flue gas desulfurization denitration device is controlled the related operator DCS monitoring found that main equipments fan fixed end bearing vibration readings and a free end bearing vibration values are larger than ever before and vibration value - in 148 160 um/s, the handheld vibration meter readings at about 6. 0 mm/s, at the same time, the main fan bearing temperature rise 60 ℃ ( Because the wind generator in outdoor, commissioning daily temperature at 25 ℃ - Between 30 ℃) Central control room, the related operation personnel according to the monitoring shows that the change of temperature and vibration value, judgment, though not achieve parking device interlock alarm limits, but still cause larger parameter values change alert, decisive inform on-site inspection staff view, and make the operation of the emergency stop, EPC contractor for parking in the wind turbine after technical personnel and related personnel to inspect and disassemble repair, site after dismantling, found that the induced draft fan bearing box front supporting self-aligning roller bearing, Model: 22244 me4 / FAG) Visible bearing raceway has been designed stripping, raceway and rolling body and keep the color, the phenomenon such as crack and severe wear roller ( See image below) For recovery device is put into operation as soon as possible, through research and consultation, with the cooperation of relevant technical personnel in the company, general contractor immediately purchase of spare parts such as bearings, after nearly six hours of assembly, calibration, repair and restore device running on the same day afternoon. （ 22244 me4 / FAG bearing raceway and roller failure characterization) Second, the failure process and the reason analysis: (1) obtaining control of DCS system to monitor the real-time running curve, from the main blower vibration value and the change of the temperature control parameter values, rise, combined with field basic condition and state as well as cooling water units running situation, the preliminary judgment caused the main units of value and the change of the temperature control parameter values, main fault range and specific parts from the increased bearing box front bearing; (2) after the machine stop, general contractor, the construction supervision party, company related technical management personnel to the scene and dismantling inspect, bearing box front self-aligning roller bearing is failure, do not have working conditions of use, the failure of bearing raceway and rolling element bearing has evident present designed stripping, discoloration, cracks and wear and tear, to meet the requirements of operation, decided to change the total 22222244 me4 bearing NSK/provided by the contractor; (3) comprehensive related operational signs and from the object, the general contractor, the construction supervision party, company related technical managers agree that cause the damage of fan bearing box self-aligning roller bearing failure can basically eliminate the cause of bearing fault operation factors such as quality, quality of lubricating oil, cooling water; (4) by the further investigation, found that the total project contractor during the commissioning is not strictly implement assembly technology condition, the equipment commissioning plan and operation procedures manual content, from single machine commissioning, system linkage debugging to device hot start-up, commissioning and system has not been effectively and strictly enforce the system start-up scheme and fan unit product specifications, about 45 days' induced draft fan bearing lubricating oil first replacement maintenance time 'technical regulations, technical management personnel related to the construction supervision party and company combining to characterize damage of the bearing and the bearing box to put off the qualitative judgment of lubricating oil, concluded that the cause of the failure is: general contractor in the early construction of assembly unit to form a complete set of bearing box oil pool for the compliance of cleaning and cleaning, assembly process control is not strict, at the same time during the trial operation, not strictly carry out the related solution and unit lubrication technical specification, miss fan unit lubrication system lubrication ChuBao time, bad working condition of lubrication and direct cause iron material bearing the residual casting metal powder material in the cabinet with for a long time to bite into the grinding of the bearings, lead to damage of bearing failure. Three, remedy and countermeasures: (1) technical colloquia held device downtime and the related problem, find out the sticking point, analyzing reasons, determine responsibility, strengthening the technical process management controls, in the wind turbine after the repair process, the company claim construction supervision to the whole process of tracking, recorded, and the key of fan bearing box assembly oil pool for the strict cleaning and cleaning; NSK / 22222244 me4 replace conform to the requirements of the bearing plate 1, according to the unit product technical specification change 46 # L - the TSA turbine oil lubricating oil etc. (2) organize the relative technical units, technical personnel, in conjunction with the general contractor, construction supervision in accordance with the technical agreement and the project completion acceptance of the technical conditions such as pre acceptance standards and requirements for the technical screening device and system commissioning phase, for plant operations and acceptance system solid technology foundation, focus on the lubrication of the lubrication system, lubrication point operation quality, lubrication technology with the general contractor to complete the whole system improvement, at the same time strengthening the device related jobs, the future protection of lubrication technical training, prevent similar accidents happen here. （ Source: coal chemical industry, 999)