CN2690840Y

CN2690840Y - Rotary air preheater

Info

Publication number: CN2690840Y
Application number: CN 200420003963
Authority: CN
Inventors: 孟金来
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-04-13
Filing date: 2004-04-13
Publication date: 2005-04-06
Anticipated expiration: 2014-04-13

Abstract

The utility model relates to a sealing device of a rotary air preheater, comprising contact type sealing devices arranged between the upper edge and the lower edge of each radial baffle and sector plates, and contact type sealing devices are also positioned between the axial edge and the axial plate of the outer margin of each radial baffle. The utility model is an arc shape spring plate whose one end is fixed on the upper edge and the lower edge or the axial edge of the outer margin of the radical baffles and a sealing slide plate which is made of synthetic graphite and sealed and connected with the sector plates and the axial plates. The contact type sealing device of the utility model is simple in structure and convenient in installation and maintenance, which can fully replace the original radial sealing plates or the axial sealing plates and be positioned on the original radial sealing plates or the axial sealing plates. By adopting the sealing slide plate made of the synthetic graphite material and the refractory stainless steel spring sheet, the radical or axial gap caused by the temperature distortion of the rotor can be effectively eliminated, and therefore, the increased air leakage can also be eliminated. The rate of air leakage of the entire preheater is controlled below 3 %, and the heat efficiency of the boiler is increased.

Description

Rotary regenerative air preheater

Technical field

The utility model relates to a kind of rotary regenerative air preheater, relates to a kind of sealing device in the rotary regenerative air preheater specifically, belongs to the heat-exchange apparatus in the heat power plant boiler unit.

Background technology

Rotary regenerative air preheater is to utilize the hot flue gas heating that the coal-burning boiler afterbody is discharged in the thermal power plant to enter a kind of heat-exchange device of the cold air temperature of boiler auxiliary combustion.This device is by being contained in epitrochanterian large tracts of land heat transfer element, along with the rotation continuously of rotor, the heat of the hot flue gas of discharging and the cold air that enters is alternately carried out heat exchange.Columnar rotor radially is separated into not connected plurality of sector storehouse with dividing plate from top to bottom, and each fan-shaped storehouse is divided into plurality of sections again.Flue gas or air circulate up and down by the slit of heat transfer element.Thereby with two fanning strips whole cross section is divided into flue gas Circulation Area, circulation of air district and seal area three parts accordingly up and down, and the flue gas that neither circulates in the seal area, also ventilating air not, thereby flue gas can not mix mutually with air.But since gapped between rotor and fanning strip and the shell, owing to have sizable pressure differential between air and the flue gas, make the problem of leaking out of rotary regenerative air preheater become particularly outstanding simultaneously.The main cause that rotary air preheater air leak is big is the thermal deformation of preheater, causes that the seal area intermediate gap is excessive, i.e. excesssive gap between apex seal and the fanning strip; Excesssive gap between axial seal sheet and the barrel shrond.Air leak rate of air curtain is to weigh an important indicator of rotary regenerative air preheater technical merit.Solving the problem of leaking out at present is in advance by the hot shaping parameter of calculating, reserve the thermal deformation gap, promptly according to this parameter adjust respectively be installed on the dividing plate radially radially or axial seal sheet and fanning strip or the axial distance between the plate, make hot down, seal clearance amount minimum.But it is, this very inaccurate according to the hot shaping parameter of calculating because the hot shaping of preheater is subjected to the influence of several factors.Obviously, preset clearance is excessive, and hot leakage in service is rather windy; Preset clearance is too small, makes dynamic and static part bump again, influences the normal operation of equipment.

The utility model content

The purpose of this utility model is in order to overcome the defective of prior art, a kind of air leak rate of air curtain that can reduce preheater effectively to be provided, improving the rotary regenerative air preheater of heat exchanger effectiveness.

The utility model rotary regenerative air preheater, comprise the cylindric rotor that rotates around central shaft, this rotor comprises several dividing plate plurality of sector storehouses of separating radially of fixedlying connected with central shaft, in the straight classical prescription of rotor 4 or 6 fanning strips is installed symmetrically up and down; Fixedly connected with rotor case 2 or 3 blocks of axial plates are vertically mounted on respectively between upper and lower two fanning strips; Wherein radially between the upper and lower limit of dividing plate and the fanning strip contact type sealing device is installed at each; On each axial limit of dividing plate outer rim and axially between the plate contact type sealing device is installed radially.

The utility model rotary regenerative air preheater, wherein contact type sealing device comprises that an end is fixed on radially the upper and lower limit of dividing plate or the arc spring plate on the axial limit of outer rim, the other end of this latch plate and groove type slide plate cover bottom centre are connected and fixed; Slide plate cover openend both sides are provided with the bending edges that bends towards in the groove; It is equipped that the drop bar both sides of being made by the synthetic graphite material have the bending edges that draw-in groove and slide plate put; Slide plate and fanning strip or axial plate contact jaw both sides are provided with the inclined plane.

The utility model rotary regenerative air preheater, the contact jaw of its middle slide plate and fanning strip or axial plate is a circular arc.

The contact type sealing device that designs in the utility model rotary regenerative air preheater, simple in structure, be easy for installation and maintenance again; It can replace original apex seal or axial seal sheet fully, also can be installed on original apex seal or the axial seal sheet, the drop bar and the resistant to elevated temperatures stainless steel spring sheet material that adopt the synthetic graphite material to make, eliminate effectively rotor because of temperature distortion produced radially or axial gap, and the defective that causes leaking out and increase, directly leaking out of preheater reduced widely, only exist to carry and leak out; The air leak rate of air curtain of whole preheater is controlled at below 3%, has improved the thermal efficiency of boiler, has tangible economic benefit.

Description of drawings

Fig. 1 is a rotary regenerative air preheater rotor structural representation sketch;

Fig. 2 overlooks and the A-A generalized section for Fig. 1's;

Fig. 3 radially connects generalized section for the utility model contact type sealing device;

Fig. 4 axially connects generalized section for the utility model contact type sealing device.

The specific embodiment

By Fig. 1, Fig. 2 as seen, comprise the cylindric rotor that rotates around central shaft 9 in the rotary regenerative air preheater rotor structure, this rotor radially is made up of in the dividing plate 1 plurality of sector storehouse of being separated several of fixedlying connected with central shaft 9, each fan-shaped storehouse is divided into plurality of sections again, fill the heat transfer element of making by metal corrugated plate in the fan-shaped storehouse, claim heat accumulation plate again, hot flue gas and cold air circulate up and down by the slit of heat transfer element and carry out heat exchange.For the rotary regenerative air preheater in three fens storehouses,, radially between the upper and lower limit of dividing plate 1 and the fanning strip 2 contact type sealing device 3 is installed at each at upper and lower each 3 fanning strip 2 of installing symmetrically of the diametric(al) of rotor; 3 blocks of axial plates 4 of fixedlying connected with preheater shell 10 are vertically mounted on respectively between upper and lower two fanning strips 2, on each the radially axial limit of dividing plate 1 outer rim and axially installation contact type sealing device 3 between the plate 4.

By Fig. 3 or Fig. 4 as seen, contact type sealing device 3 of the present utility model comprises that an end is fixed on radially dividing plate 1 upper and lower limit or axially the arc spring plate 5 on limit, and the other end of this latch plate 5 and groove type slide plate overlap 6 bottom centre and be connected and fixed; Slide plate overlaps 6 openend both sides and is provided with the bending edges 7 that bends towards in the groove; The bending edges 7 that drop bar 8 both sides of being made by the synthetic graphite material have on draw-in groove and the slide plate cover 6 is equipped; Slide plate 8 is provided with the inclined plane with fanning strip 2 or axial plate 4 contact jaw both sides; Latch plate 5 is selected for use resistant to elevated temperatures elastic stainless steel to bend to arc and is made.

Claims

1, rotary regenerative air preheater, comprise the cylindric rotor that rotates around central shaft (9), this rotor comprises several dividing plate (1) plurality of sector storehouses of being separated radially of fixedlying connected with central shaft (9), in the straight classical prescription of rotor 4 or 6 fanning strips (2) is installed symmetrically up and down; Fixedly connected with preheater shell (10) 2 or 3 blocks of axial plates (4) are vertically mounted on respectively between upper and lower two fanning strips (2); It is characterized in that described each radially between the upper and lower limit of dividing plate (1) and the described fanning strip (2) contact type sealing device (3) is installed; Described each radially between the axial limit of dividing plate (1) outer rim and the described axial plate (4) contact type sealing device (3) is installed.

2, rotary regenerative air preheater according to claim 1, it is characterized in that described contact type sealing device (3) comprises that an end is fixed on the upper and lower limit of described radially dividing plate (1) or the arc spring plate (5) on the axial limit of outer rim, the other end of this latch plate (5) and groove type slide plate cover (6) bottom centre are connected and fixed; Described slide plate cover (6) openend both sides are provided with the bending edges (7) that bends towards in the groove; The bending edges (7) that drop bar (8) both sides of being made by the synthetic graphite material have on draw-in groove and the described slide plate cover (6) is equipped; Described slide plate (8) is provided with the inclined plane with described fanning strip (2) or described axial plate (4) contact jaw both sides.

3, rotary regenerative air preheater according to claim 2 is characterized in that the described slide plate (8) and the contact jaw of described fanning strip (2) or described axial plate (4) are circular arc.