CN215523372U

CN215523372U - Boiler rotary air preheater heat transfer device

Info

Publication number: CN215523372U
Application number: CN202121721424.9U
Authority: CN
Inventors: 高建强; 陈志斌; 蔚冉; 危日光
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-01-14
Anticipated expiration: 2031-07-27

Abstract

The utility model provides a boiler rotation air heater heat transfer device, includes shell, rotor center pivot, be equipped with a plurality of strip dull and stereotyped districts on every buckled plate in the rotor, a plurality of strip dull and stereotyped districts are cut apart into a plurality of rectangle ripple districts with the buckled plate, the locating plate is the corrugate, and every locating plate is out of shape for crest form uplift joining region with the corresponding position in dull and stereotyped district on the adjacent buckled plate, and the top and the dull and stereotyped district of crest form uplift joining region are connected, and space between adjacent locating plate and the buckled plate is separated into a plurality of confined air current passageways by a plurality of crest form uplift joining region, and the crest form uplift joining region of every dull and stereotyped district both sides locating plate of buckled plate all is connected with the middle part in this dull and stereotyped district. The wave crest-shaped bump connecting areas on the two sides of the flat plate area are connected with the middle part of the flat plate area, so that the width of the flat plate area can be reduced, the number of waves of the corrugated plate is increased, and the heat transfer effect is improved.

Description

Boiler rotary air preheater heat transfer device

Technical Field

The utility model relates to a heat exchange device applied to a power station boiler, and belongs to the technical field of heating.

Background

The air preheater widely used in utility boilers has two types, tubular and rotary. The heat transfer mode of the tubular air preheater is as follows: the heat is continuously transferred from the flue gas to the air through the pipe wall, and the heat transfer mode is indirect. The rotary air preheater transfers heat in a regenerative manner, with flue gas and air alternately flowing over the heated surfaces of the heat transfer elements. When the flue gas flows through, heat is transferred to the heating surface from the flue gas, the temperature of the heating surface is increased, and heat accumulation is carried out; when the air flows through again, the heat receiving surface transfers the accumulated heat to the air.

In the rotary air preheater device, a heat transfer element is a core component of the rotary air preheater device and consists of corrugated plates and positioning plates, wherein the corrugated plates and the positioning plates are rolled by thin steel with the thickness of 0.5-0.8mm, the corrugated plates and the positioning plates are sequentially arranged at intervals, and an air flow channel is formed between the corrugated plates and the positioning plates. The corrugated plate and the inclined corrugations on the positioning plate form a certain included angle with the air flow direction so as to enhance air flow disturbance and improve heat transfer effect. The positioning plate not only plays a role in heat exchange, but also fixes the corrugated plates together according to a certain distance, and ensures that the airflow has a certain flow cross section.

During use, dust is easily deposited in the airflow channel of the heat transfer element, and if the dust cannot be cleaned in time, the airflow channel is blocked, so that the rotary air preheater cannot normally operate.

The plate type of the traditional heat transfer element, such as the DU plate type, the butt joint of the S-shaped positioning plate and the L-shaped corrugated plate is the inclined corrugation, when blowing soot, because the soot blowing distance is longer and the inclined corrugation has a certain blocking effect, the soot deposition is difficult to remove, while the DUe plate type changes the joint of the corrugated plate 17 and the positioning plate 16 into the flat plate area 15, thereby solving the soot blowing problem, but because the wave crest-shaped bump connecting areas 14 of the positioning plates 16 are arranged in alignment, the positions of the connecting areas of each flat plate area 15 of the corrugated plate 17 and the positioning plates 16 at two sides are different, so that the flat plate area is too wide, the corrugation quantity of the corrugated plate is reduced, the heat exchange efficiency is obviously reduced, and therefore the improvement is necessary.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides a heat exchange device of a rotary air preheater of a boiler, which can reduce the difficulty in cleaning accumulated dust, ensure the heat transfer effect and ensure the high-efficiency operation of the rotary air preheater.

The problems of the utility model are solved by the following technical scheme:

a heat exchange device of a rotary air preheater of a boiler comprises a shell, a rotor central rotating shaft, a primary air bin cold air inlet, a secondary air bin cold air inlet, a primary air bin hot air outlet and a secondary air bin hot air outlet, the rotor comprises a plurality of corrugated plates and a plurality of positioning plates which are arranged at intervals, each corrugated plate is provided with a plurality of strip-shaped flat plate areas, the corrugated plates are divided into a plurality of rectangular corrugated areas by the strip-shaped flat plate areas, the locating plate is corrugate, and every locating plate and the corresponding position in dull and stereotyped district on the adjacent corrugated plate warp to crest form uplift joining region, and the top and the dull and stereotyped district in crest form uplift joining region are connected, and the space between adjacent locating plate and the buckled plate is separated into a plurality of confined air current passageways by a plurality of crest form uplift joining regions, and the crest form uplift joining region of every dull and stereotyped district both sides locating plate of buckled plate all is connected with the middle part in this dull and stereotyped district.

Above-mentioned boiler rotary air preheater heat transfer device, a plurality of strip dull and stereotyped districts on the buckled plate evenly distributed on the buckled plate to cut apart a plurality of rectangle ripple districts that the shape is the same with the buckled plate.

The boiler rotary air preheater heat exchange device has the advantages that the positioning plates positioned on two sides of the same corrugated plate are completely the same in shape, and the positioning plates are symmetrically fixed on two sides of the corrugated plate and are opposite in corrugated direction.

Above-mentioned boiler rotary air preheater heat transfer device, the locating plate is connected with the buckled plate welding, and the surface of locating plate and buckled plate all is equipped with the enamel layer.

The wave crest-shaped bulge connecting areas on the two sides of the flat plate area are connected with the middle part of the flat plate area, so that the width of the flat plate area can be reduced, the corrugation number of the corrugated plate is increased, the heat transfer effect is improved, and the high-efficiency operation of the rotary air preheater can be ensured.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a rotary air preheater;

FIG. 2 is a schematic structural view of a heat transfer element of the present invention;

fig. 3 and 4 are top views of the positioning plates on two sides of the same corrugated plate in fig. 2.

In the drawings, the reference numerals denote: 1. the device comprises a primary air bin cold air inlet, a secondary air bin cold air inlet, a primary air bin hot air outlet, a secondary air bin hot air outlet, a shell, a rotor central rotating shaft, a rotor radial sealing sheet, a heat transfer element, a rotor axial sealing sheet, a rotor shell, a hot air bin smoke outlet, a hot air bin smoke inlet, a rotor radial sealing sheet 9, a heat transfer element, a rotor axial sealing sheet 11, a rotor shell body, a hot air bin smoke outlet, a hot air bin smoke inlet, a corrugated sheet connecting area, a flat sheet area, a positioning plate, a corrugated sheet, an airflow channel and a positioning plate, wherein the corrugated sheet is arranged on the rotor radial sealing sheet, the secondary air inlet, the secondary air outlet, the secondary air inlet, the secondary air outlet, the secondary air inlet, the secondary air outlet, the secondary air inlet, the secondary air outlet, and the secondary air outlet.

Detailed Description

The utility model provides a heat exchange device which has a good heat transfer effect and is convenient for ash discharge.

Fig. 1 is a schematic structural diagram of a heat exchange device of a rotary air preheater of a boiler, which comprises a shell 5, a rotor 7, a rotor central rotating shaft 6, a primary air bin cold air inlet 1, a secondary air bin cold air inlet 2, a primary air bin hot air outlet 3 and a secondary air bin hot air outlet 4. The rotatable cylindrical rotor 7 is divided into a plurality of fan-shaped bin lattices, each fan-shaped bin lattice is internally provided with a heat transfer element 9, and the top and the bottom of the circular shell 5 are divided into a smoke circulation area (corresponding to a hot air bin smoke outlet 12 and a hot air bin smoke inlet 13 in the figure), an air circulation area (corresponding to a primary air bin cold air inlet 1, a secondary air bin cold air inlet 2, a primary air bin hot air outlet 3 and a secondary air bin hot air outlet 4 in the figure) and a sealing area in an up-and-down manner. The smoke gas circulation area is connected with the smoke channel, the air circulation area is connected with the air channel, the rotor 7 rotates at the rotating speed of 1-3r/min, when the heat transfer element 9 rotates to the smoke gas circulation area, smoke gas can flow through the heating surface of the heat transfer element 9 from top to bottom, the heating surface and the smoke gas are subjected to heat exchange to be heated, when the heat transfer element 9 rotates to the air circulation area, the air flows through the heating surface of the heat transfer element 9 from bottom to top, the heating surface can transfer absorbed heat to the air, and once heat exchange can be completed when the rotor rotates for one circle.

Referring to fig. 3-4, the rotor of the present invention includes a plurality of corrugated plates 17 and a plurality of positioning plates 16, which are spaced apart, namely, a corrugated plate 17 is clamped between two positioning plates 16, a positioning plate 16 is also clamped between two corrugated plates 17, each corrugated plate 17 is provided with a plurality of strip-shaped flat plate areas 15 which are uniformly distributed, the length directions of the strip-shaped flat plate areas 15 are parallel, thereby dividing the corrugated plate 17 into a plurality of rectangular corrugated areas, that is, the corrugated areas and the flat areas are arranged in a crossed manner, the shapes of the rectangular corrugated areas are the same, the positioning plates 16 are corrugated, the part of each positioning plate 16 corresponding to the flat area 15 on the adjacent corrugated plate 17 is deformed into a wave crest-shaped bump connecting area 14, the top of the wave crest-shaped bump connecting area 14 is connected with the flat area 15 on the corrugated plate 17, and the space between the adjacent positioning plate 16 and the corrugated plate 17 is divided into a plurality of closed air flow channels 18 by the wave crest-shaped bump connecting areas 14. In order to reduce the width of the flat areas 15 of the corrugated plate 17, the crest-shaped raised connecting areas 14 of two adjacent positioning plates 16 of the corrugated plate 17 are symmetrically arranged on both sides of the flat area 15, the middle part of each flat area 15 of the corrugated plate 17 is connected with the positioning plates 16 on both sides, and the weld beads are symmetrically arranged on both sides of the middle part of the flat area 15.

The shapes of the positioning plates 16 on the two sides of each corrugated plate 17 are completely the same, and the positioning plates 16 on the two sides are symmetrically fixed on the two sides of the corrugated plate 17, and the corrugation directions of the positioning plates 16 on the two sides are opposite.

In this embodiment, when the heat transfer element rotates to the flue gas circulation zone, the flue gas passes through closed airflow channel 18 and releases the heat, and the heat transfer element heats up, and when the heat transfer element rotates to the air circulation zone along with the rotor, the air passes through closed airflow channel 18 and absorbs the heat, realizes the thermal recycle of flue gas, strengthens boiler furnace burning to reduce exhaust gas temperature, improve boiler efficiency.

The height of the wave crest shaped bump connecting area 14 part on the positioning plate 16 is used for adjusting the height of the airflow channel 18, and the wave crest shaped bump connecting area 14 is not provided with oblique ripples, so that the smoke circulation is convenient, the smoke circulation resistance is maintained within a proper range, and the heat exchange efficiency is improved. The locating plates are arranged in an up-and-down symmetrical mode, and the middle of the flat plate area is connected with the crest-shaped bump connecting areas of the locating plates on the two sides, so that the width of the flat plate area can be reduced, and the corrugation quantity of corrugated plates can be increased. The straight channel heat transfer element made of the wavy plates has larger contact area with fluid than the traditional heat transfer element, not only retains the advantage of convenience in soot blowing of the original plate type, but also improves the heat exchange efficiency. And part of heat exchange surfaces can be reduced while the heat exchange performance is met, so that the aim of saving materials is fulfilled.

Claims

1. A heat exchange device of a rotary air preheater of a boiler comprises a shell (5), a rotor (7), a rotor center rotating shaft (6), a primary air bin cold air inlet (1), a secondary air bin cold air inlet (2), a primary air bin hot air outlet (3), a secondary air bin hot air outlet (4) and a characteristic, wherein the rotor comprises a plurality of corrugated plates (17) and a plurality of positioning plates (16) which are arranged at intervals, each corrugated plate (17) is provided with a plurality of strip-shaped flat plate areas (15), the corrugated plates (17) are divided into a plurality of rectangular corrugated areas by the strip-shaped flat plate areas (15), the positioning plates (16) are corrugated, the corresponding positions of the flat plate areas (15) on each positioning plate (16) and the adjacent corrugated plates (17) are deformed into crest-shaped uplift connecting areas (14), and the tops of the crest-shaped uplift connecting areas (14) are connected with the flat plate areas (15), the space between the adjacent positioning plates (16) and the corrugated plates (17) is divided into a plurality of closed air flow channels (18) by a plurality of wave crest-shaped bulge connection areas (14), and the wave crest-shaped bulge connection areas (14) of the positioning plates (16) on two sides of each flat plate area (15) of the corrugated plates (17) are connected with the middle parts of the flat plate areas (15).

2. A heat exchanger for a rotary air preheater of a boiler as recited in claim 1, wherein said corrugated plate (17) has a plurality of flat strip sections (15) uniformly distributed on the corrugated plate (17) and dividing the corrugated plate (17) into a plurality of rectangular corrugated sections having the same shape.

3. A boiler rotary air preheater heat exchange unit as claimed in claim 1 or 2, wherein the positioning plates (16) located at both sides of the same corrugated plate (17) are identical in shape, and are symmetrically fixed at both sides of the corrugated plate (17) and the corrugated directions of the positioning plates (16) at both sides are opposite.

4. The heat exchange device of the rotary air preheater of the boiler as claimed in claim 3, wherein the positioning plate (16) is welded with the corrugated plate (17), and the outer surfaces of the positioning plate (16) and the corrugated plate (17) are provided with enamel layers.