Hot air isolating door of thermal power station coal mill

Abstract

The invention discloses a hot air isolating door of a thermal power station coal mill. The hot air isolating door comprises an air duct door body, a door frame, a door plate and a driving mechanism. The driving mechanism is provided with a buffering device, the door frame and the door plate are provided with sealing devices, and a soot blowing mechanism is arranged on the inner side of the bottom edge of the door frame. According to the hot air isolating door of the thermal power station coal mill, the soot blowing mechanism, a four-bar linkage transmission mechanism, the buffering device and an omega-shaped hard sealing technology are combined ingeniously, the problem that the door cannot be tightly closed and inner leakage is caused due to local deformation and soot accumulation of the hot air isolating door and outleakage is caused due to pipe connection looseness is solved well, and the potential safety hazard is eliminated. The hot air isolating door has the advantages of being simple in structure, convenient to operate, safe, reliable, high in intelligence, easy to install, convenient to maintain and long in service life and the like, simultaneously further has the advantages of being high in reliability, good in safety and high in practicality and can have extremely good economic benefit and social effect.

Description

technical field [0001] The invention relates to coal pulverizer equipment in a thermal power station, in particular to an isolation door installed at the entrance of the coal pulverizer in a thermal power station to prevent hot air from entering the coal pulverizer. Background technique [0002] With the rapid development of thermal power units, medium-speed coal mills have replaced steel ball coal mills as the main pulverizing equipment in large thermal power plants. As a coarse ore type equipment, the medium-speed coal mill has the advantages of low investment, low power consumption, and easy operation, but it also has disadvantages such as easy wear of the main grinding parts, short equipment overhaul cycle, long maintenance time, and inability to synchronize with boiler maintenance. Since the pulverization capacity of the coal mill is directly related to the output of the generator set, the power station uses the redundant design of the medium-speed coal mill to ensure t...

AI Technical Summary

Problems solved by technology

[0005] One is that the large impact force of closing the door will easily cause the packing sealing strip to deform greatly and break and lose the sealing effect

Due to the impact inertia of the door panel's own weight, cylinder thrust and high-speed airflow movement (the damping of the buffer cylinder is small, and the action force of the smaller cylinder is insufficient), the punching force of the door panel on the door frame is large when the door is closed, resulting in packing seals. Severe extrusion deformation or even broken, loss of sealing function, resulting in internal leakage

[0006] The second is that the impact force of closing the door causes local deformation of the door frame and door panel to cause internal leakage, and the large vibration of the air duct causes external leakage.

[0007] Thirdly, the design of the soot blowing function at the bottom of the door is not good enough, and the soot blowing is not thorough, resulting in loose door closing and reduced reliability

[0008] Fourth, the service life of the packing seal is short

The elasticity and flexibility of the packing strips at high temperature are poor, fragile and easy to age

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