CN2218919Y - Sound wave ash blower for large power station boiler - Google Patents

Abstract

The utility model relates to a sound wave ash blower for a large power station boiler, especially suitable for blowing ash for the large power station boiler. The utility model adopts that a radial through hole is arranged on the rotor of a long shaft; A position on a cylindrical stator which is sheathed on the rotor is corresponding to the through hole of the rotor, and is symmetrically provided with a steam inlet hole and a steam outlet hole. Longitudinal wave type sound wave is generated by utilizing the positional variation of the through hole of the rotor, the steam inlet hole and the steam outlet hole of the stator, and is exported from the steam outlet hole so as to achieve the aim of blowing the ash. The utility model adopts superheated steam with high pressure and high temperature and the technical measures of generating high power and low frequency sound so that the utility model can solve the greater difficult problem of the sound wave blowing the ash for the large power station boiler.

Description

The large-sized station boiler acoustic wave ash ejector

The utility model belongs to mechanical field, especially for the soot blower of thermal power plant large-sized station boiler heat exchanger.

At present, utilize Principles of Acoustics to remove the technology of industrial furnace heat exchanger flue gas dust stratification in test and application.But, prior art is unsuitable for being used in the high temperature position heat exchanger of large-sized station boiler, its main cause is because the characteristics of large-sized station boiler body and operation, high-temperature high-pressure overheat steam that must employing itself is a power source, must have sizable flow just can exchange the required sound field energy of the big volume of boiler for again.Therefore, under the superheated steam condition of big flow, high temperature, high pressure, the soot blower that produces powerful low-frequency sound wave is the insoluble problem of prior art, has limited the usage range of sonic soot blowing.As Chinese patent " resonant acoustic dedusting apparatus " and " infrasound and low-frequency sound generator " all is to utilize modulation to decide plate and accent keep plate, and area size, shape and the position of periodic variation nozzle inlet reach and produce the sound wave of various frequencies and waveform.Utilize above method shortcoming to be, efficient is not high enough, all can not take into account the requirement of low frequency, high-power and high efficiency three aspects, influences practical function.

The purpose of this utility model is to address the above problem, and a kind of 200MW of being applicable to unit acoustic wave ash ejector that above large-sized station boiler high temperature section heat exchanger is used is provided.

The technical solution adopted in the utility model is, comprises that has a major axis type rotor, in the major axis rotor exterior, is with a concentric cylindrical stator, and the major axis rotor connects with drive unit, has radial direction through hole on the major axis rotor.Have an admission opening and a vapor opening on the cylindrical wall of stator axisymmetrically, its axial location is consistent with the lead to the hole site of major axis rotor.The both ends of the surface of rotor and stator are isolated by the steam seal dish, so the steam cock of the synthetic rotary valve type of stator and rotor set.The high temperature and high pressure steam of source of superheated steam reaches the admission mouth of pipe through a buffering.If axle shape epitrochanterian radial direction through hole overlaps topped with air intake on the sleeve shaped stator with venthole, then steam passes axis hole by admission opening and sprays from vapor opening, if epitrochanterian hole and air intake dislocation, then steam is blocked, and does not have steam to spray from venthole.Rotor is rotated by motor drives, the relative position of through hole and admission opening on the periodic variation rotor, periodically form conducting with and the blocking-up, steam sprays intermittently, promptly produces the compressional wave type sound wave of density interphase, becomes acoustic wave ash ejector.Because axle shape rotor can bear higher steam pressure, be convenient to processing again and carry out the material processing, can be suitable for the variations in temperature of high-temperature steam; The area of perforate is convenient to increase on the major axis rotor, can obtain big circulation area, and hole shape also is convenient to adjust, to improve gas sound conversion efficiency.Therefore, solved the many contradiction that adopts the big flow superheated steam of high pressure-temperature to bring, solved practical problems from design and processes two aspects, can be used for 200 to 500MW and 500MW above unit station boiler, high temperature position is implemented sonic soot blowing.

Fig. 1 is a structural representation of the present utility model.

Below in conjunction with accompanying drawing concrete structure of the present utility model and enforcement are introduced in detail:

Adopt structure shown in Figure 1 in force, comprise major axis shape rotor 13, the two ends of rotor major axis are by bearing 10 and symmetrical bearing two end supports, and wherein an end is by shaft coupling 2 and 3 and drive and advise device motor 1 to link, by motor 1 driven rotary.Two end faces of axle shape rotor 13 are isolated with labyrinth sealing dish 7 and stator 9, have formed the rotating shaft system of a dual-gripper.The periphery in rotating shaft stage casing is with the stator tube 9 of a sleeve shaped, and stator 9 connects fixing by fixed muffle 6 and support 5.Have admission opening 16 on the tube wall of sleeve stator 9 middle parts, and be welded with steam inlet pipe 17, steam inlet pipe 17 is used to connect the vapour source, can connect a steam buffer jar between vapour source and steam inlet pipe 19.Have vapor opening 14 axisymmetrically with admission opening 16 on the sleeve stator 9, and be welded with steam outlet pipe and flange, as the outlet of sound ash-ejector.

Its course of work is that motor 1 drives 13 rotations of major axis rotor by shaft coupling 2 and 3.The radial position of through hole 15 in the rotating shaft 13, the periodically-varied with rotation.During rotor 13 rotations, the admission opening 16 periodic variation relative positions on epitrochanterian through hole 15 and stator 9 sleeves periodically form connection or blocking-up.Promptly form the periodic switch of rotary valve type.The steam of vapour source directly cushions the steam that obtains steady pressure and puts on steam inlet pipe 17 and admission opening 16.If the through hole 15 on the rotor 13 overlaps then steam by admission opening 16 flow path shaft through-holes 15 with admission opening 16 positions, again through vapor opening 14, by steam outlet pipe 13 ejections.If admission opening 16 and axis hole 15 dislocation then do not have the steam ejection.The rotation of rotor 13 forms and periodically connects and block, and sprays steam intermittently, forms the density of steam on room and time and changes, and promptly forms sound wave.With admission opening 16, rotating shaft through hole 15 and vapor opening 14 all are split into slot, have vapour sound conversion efficiency preferably, and are convenient to increase the circulation area of steam, have bigger steam flow modulation depth, are convenient to obtain more powerful sound wave.Thereby solve large-sized station boiler and adopt the big flow vapour source of HTHP power, produce the high power low-frequency sound wave, as the acoustic wave ash ejector of station boiler high temperature position.

Rotor adopts circular shaft shape, has compressive property preferably, can be used for the high steam of 18MPa, can be suitable for being raised to from room temperature 350 ℃ superheated steam difference variation.The perforate of axle shape rotor and sleeve stator all is convenient to be processed into rectangle, circulation area is convenient to increase, can obtain bigger acoustical power and conversion efficiency, solved the contradiction of steam pressure, temperature and acoustical power, efficient and frequency, made whole parameters can both satisfy the specification requirement of large-sized station boiler.Be applicable to the sonic soot blowing problem of the large-sized station boiler that difficulty is bigger.

Claims (2)

1, a kind of boiler acoustic wave ash ejector comprises rotor, stator and rotor drive, it is characterized in that rotor is the major axis type, outside at the major axis rotor, be with a concentric cylindrical stator, the both ends of the surface of rotor and stator adopt seal disc to isolate, and the end of rotor connects with drive unit; Have radial direction through hole on the major axis rotor, axial symmetry has axial location air admission hole and the venthole consistent with major axis rotor lead to the hole site on the cylindrical wall of stator.

2, boiler acoustic wave ash ejector according to claim 1 is characterized in that air admission hole and the venthole on epitrochanterian radial direction through hole of major axis and the stator cylinder wall is rectangle.

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