Visual device for clearance control of air preheater

Abstract

The invention provides a gap control visual device of an air preheater. The gap control visual device comprises an upper portion sector plate which is mounted in the air preheater and used for sealing the upper end of the air preheater, a lifting unit which is mounted on the upper surface of the air preheater so as to lift the upper portion sector plate in the air preheater according to instructions, and a monitoring unit used for reflecting the current position of the upper portion sector plate in real time. The problem that a gap measuring probe is liable to fail and break down in severe environment is solved, the current position of the upper portion sector plate is directly reflected through mechanical linkage, dependence on an automatic control system can further be reduced, and problems can be found more rapidly and promptly, so that the operation efficiency of the air preheater is improved. An inductive probe which is originally mounted in the air preheater and used for detecting the critical point of the upper portion sector plate is moved to the exterior of the air preheater, the inductive probe is prevented from being in the severe environment in the air preheater, meanwhile the problem of tedious steps of mounting is solved, and circuit connection is reduced.

Description

technical field [0001] The invention relates to an air preheater in the field of power generation, in particular to a visual device capable of reflecting in real time the gap between a sector plate and a rotor inside the air preheater without being disturbed by the environment. Background technique [0002] In the prior art, the rotary three-chamber air preheater generally adopts three kinds of sealing systems: radial-axial and bypass. Among them, the automatic control system that can track the thermal deformation of the rotor is routinely used for the radial seal, which can be controlled according to the rotor’s thermal deformation. The degree of deformation automatically adjusts the distance between the fan-shaped plate and the radial sealing sheet of the rotor. When the internal temperature of the air preheater in operation rises, the fan-shaped plate and the rotor will deform to varying degrees after being heated. When the distance between the fan-shaped plate and the ra...

AI Technical Summary

Problems solved by technology

However, the induction probe is generally installed exposed on the lifting mechanism. Since this position is outside the furnace wall, the environment is dusty, so the induction probe is often covered with dust, and even buried by accumulated dust. It cannot be monitored whether the plate has been lifted to the right position, and the signal is sent by mistake when the sector plate is not lifted, which will also cause the sector plate lifting device to refuse to move in an emergency state, thereby causing the air preheater motor to trip due to overcurrent and damage the equipment

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