Reasons and Countermeasures of High Pressure Regulating Valve Lever

1. Introduction: Hebei Xibaipo Power Generation Co., Ltd. has an installed capacity of 4 × 300MW, Harbin Hose N300-16.7 / 537 (538) / 537 (538), subcritical, uniaxial and condensing steam turbines, It is controlled by two high-pressure main steam doors and six high-pressure regulating doors (high-profile doors). The high-profile door operating mode adopts single valve or sequence valve according to the load. One # 1 unit put into operation in December 1993, after three major overhauls, six minor repairs, the last overhaul time in October 2002. 2, the cause of the incident 2.1, October 2002 # 1 unit overhaul, # 4 high-profile door disintegration found the head gate (there is no thread, but the processing of cross-dowel hole, ф12mm, L = 120mm) occurred transverse fracture. Due to stop cross-off (referred to as horizontal pin) is not prolapse, so # 4 high-profile door before the operation of stable, no exception. 2.2, door head fracture analysis 2.2.1, force. Long-term operation of the steam generated on the gate rod axial periodic excitation force, the connecting rod head and threaded parts prone to fatigue damage 2.2.2, processing technology. The gate head horizontal cross hole is drilled and then reamed. The edge of the hole presents a blade-like shape, forming a typical stress concentration point. Once the crack is formed, it rapidly develops into a fracture. 2.2.3, material. Door material 2Cr12NiMoWV, work at high temperatures, in order to increase its high temperature oxidation ability, the surface of a special nitriding, the formation of a layer of about 0.5mm thick nitrogen and nitrogen compounds, its hardness, wear resistance, oxidation resistance greatly Increase, the corresponding increase of brittleness, reduce the toughness. 2.2.4, improper assembly process. Ha steam plant high-profile door assembly process requirements: Cold installation, the door lever into the guide sleeve, the need to exert a torque of 152N * M on the door, and then loaded into the horizontal pin. That is required after the cold installation of the door stem and guide sleeve completely tight contact, forbidden to leave a gap. Hot running, the door stem is wrapped inside the guide sleeve, the temperature is higher than the guide sleeve, the linear expansion of the axial direction is greater than the guide sleeve, the tight with the above can still be guaranteed. Therefore, when the door rod is hot, the door rod is subjected to the axial exciting force of the steam, which force is transmitted directly to the guide sleeve, so that the connecting rod of the door rod is not subjected to the exciting force because the threaded portion is more likely to occur Damage to the stress concentration point, thus preventing the fatigue of the thread. The actual situation is not the case, there are six high-profile doors do not meet the technical requirements of the phenomenon of varying degrees, that cold back door lever, 152N * M torque torque applied, the door cross pin hole and guide pin cross pin hole misplacement Phenomenon, horizontal pin can not be successfully loaded. In order to be able to successfully install the horizontal pin, the door must be slightly rotated backwards. If the cross pin hole is displaced by 2mm and the connecting rod thread is M50 * 2, the door rod needs to be withdrawn by about 0.025mm, that is 0.025mm mm gap, which in turn does not meet the technical requirements of the tight fit. If the maintenance staff ignored the technical requirements of the assembly, the figure effortless and hasty installation, it will leave a security risk. More Keywords Search: Valve

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