Length is popped one's head in apart from the high temperature clearance measurement
Technical field
The present invention relates to a kind of length apart from the high temperature gap measuring apparatus, be particularly useful for the gap detection between station boiler rotary regenerative air preheater fanning strip and the apex seal.
Background technology
Rotary regenerative air preheater is meant rotor and the counterrotating a kind of air preheater of fan housing.When the high-temperature flue gas of boiler furnace discharge is flowed through primary heater rotor one side from top to bottom, the heat accumulating element in the high-temperature flue gas heating rotor.When the heat accumulating element that has heated forwarded opposite side (air side) to rotor, the cold air heat accumulating element of flowing through was from the bottom up taken away heat, thereby reached the purpose of preheating cold air.Because there is the temperature difference up and down in rotor when being heated, mushroom deformation takes place, the gap between top fanning strip and rotor radial seal sheet is increased.
Because seal clearance increases, cause the inleakage of air preheater to increase, thereby influence the efficient of boiler.If the rotor that can kinetic measurement causes because of boiler load fluctuates and the variation of fan housing spacing, the spacing of real-time regulated rotor and fan housing is kept minimum, has also just controlled inleakage, just can improve the efficient of boiler.
High temperature clearance measurement probe is the key equipment that the control system gap detection is adjusted in the air-heater leakage gap, this device is according to eddy current effect (the distance difference of the relative checkout equipment of coil of coil, current vortex intensity difference), when the rotor flange face gap that gap probe detects relatively changes (increase or reduce), the gap probe cooperates signal processor to export analog signals according to a certain percentage, and this analog signals is adjusted the logic determines condition of control system as the gap.
High temperature gap detection probe major function is to be responsible for gathering the signal in gap, and the situation of target gap is collected, and converts corresponding electric signal output to by signal processor.The gap detection probe general measure distance of home or overseas producer making at present is little, and heatproof is low, can't satisfy the requirement of big load boiler (more than the 600MW, containing 600MW) air preheater heat accumulating element change-detection, cannot control effectively to inleakage.
Summary of the invention
Technical matters: the objective of the invention is to overcome the weak point in the prior art, provide a kind of simple in structure, easy to use, the length that can enlarge signal acquisition range is apart from the high temperature gap measuring apparatus.
Technical scheme: length of the present invention is apart from the high temperature gap measuring apparatus, comprise signal processor, also comprise housing, be provided with one small-bore greatly in the housing, the adapter sleeve that is the bottleneck shape, adapter sleeve top is provided with the screw that fixes with housing, the adapter sleeve below is provided with the solenoid that twines signal wire, solenoid top and adapter sleeve heavy caliber be fit mutually, be provided with the plug that its top is positioned at adapter sleeve in the solenoid, the middle part of plug is provided with the pin that is fixed on the adapter sleeve, its top is provided with the compressing tablet on stationary solenoids top, and the bottom of plug is provided with pad, and the bottom is provided with liner, be provided with thermofin in the housing, its lower port place is provided with shrouding, and is provided with the nut that the shrouding screw thread is fixing, and the top of housing is provided with the sealing nut that signal wire passes from the center.
Described housing is made of a sleeve and the overhead gage through being bolted on the mounting bracket; Described plug constitutes by insulating base with the Connection Block of insulating base tabling.
Beneficial effect: the present invention is by measuring and regulate the gap between air preheater top fanning strip and the rotor radial seal sheet, to guarantee under any operating condition, minimum is kept in gap between shape plate top and the rotor radial seal sheet, thereby reduced inleakage, reach energy-saving and cost-reducing, improve the purpose of whole unit efficiency.Detect distance and can reach 0~20mm, linear good, accuracy of detection 〉=0.5mm, the precision height, heatproof can reach 550 ℃, is applicable to the high temperature gap detection.
Description of drawings
Accompanying drawing is a structural drawing of the present invention.
Among the figure: 1-housing, 2-adapter sleeve, 3-plug, 4-solenoid, 5-shrouding, 6-pad, the 7-pin, the 8-liner, the 9-compressing tablet, the 10-nut, 11-connects sealing nut, the 12-mounting bracket, 13-thermofin, 14-attachment screw, 15-overhead gage, 16-high-temperature insulation asbestos layer.
Embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
Shown in the accompanying drawing, the long probe apart from the high temperature clearance measurement mainly is made up of housing 1, adapter sleeve 2, plug 3, solenoid 4, shrouding 5, pad 6, pin 7, liner 8, compressing tablet 9, nut 10, connection sealing nut 11.Housing 1 is made of sleeve and the overhead gage 15 through being bolted on the mounting bracket 12, and the side plate of mounting bracket 12 is welded on the air preheater fanning strip.One small-bore greatly, as to be bottleneck shape adapter sleeve 2 is housed in the sleeve of housing 1, and adapter sleeve 2 outside big small-bore junctions are provided with the shoulder that leans against on the overhead gage 15, are fixed together through attachment screw 14.Adapter sleeve 2 lower ends are provided with and its heavy caliber solenoid 4 of fit mutually, be provided with the high-temperature insulation asbestos layer 16 of isolation signals line in the solenoid 4, be provided with the plug 3 that stretches in the adapter sleeve 2 in the high-temperature insulation asbestos layer 16, plug 3 constitutes by insulating base with the Connection Block of insulating base tabling; The top of plug 3 is provided with the pin 7 that is fixed on the adapter sleeve 2, the top is provided with the compressing tablet 9 on stationary solenoids 4 tops, the insulating base of plug 3 is provided with the pad 6 that insulating base is fixing, the bottom of plug 3 is provided with liner 8, be provided with insulating layer of asbestos 13 in the housing 1, its lower port place is provided with the ring sealing plate 5 of high temperature wear resistant ceramic, and ring sealing plate 5 is provided with its screw thread is fixed on nut 10 on the housing 1.To be hedged off from the outer world except that the enclosure interior space the solenoid 4 by shrouding 5, prevent that foreign matter from entering enclosure interior, avoid enclosure interior equipment to be collided or corrode; Liner 8 is installed in solenoid 4 lower bottom parts, and isolated solenoid 4 inside and outside directly contact, and prevents that small foreign body intrusion solenoid 4 tops from consequently influencing the generation of signal; Connect sealing nut 11 and connect together by screw thread and adapter sleeve, the signal wire that links to each other with signal processor passes from being connected sealing nut 11, avoids foreign matter to enter adapter sleeve.
During installation, solenoid 4 is installed in the central authorities of probing shell 1, and vertical bottom face will guarantee to pop one's head in the bottom surface over against gap detection target upper surface during on-the-spot the installation.When detector gap changed, gap signal changed thereupon, changed the 4~20mA standard electric signal corresponding with the gap into and carried out logic determines and control by being installed in signal transmitting device in the external control cabinet.