CN110686271A

CN110686271A - Air heater with air-tight seal structure

Info

Publication number: CN110686271A
Application number: CN201910977668.4A
Authority: CN
Inventors: 程曦; 柳忠操
Original assignee: Laohekou New Technology LLC
Current assignee: Laohekou New Technology LLC
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-01-14
Anticipated expiration: 2039-10-15
Also published as: CN110686271B

Abstract

The invention relates to the technical field of air preheaters, in particular to an air preheater with an air-tight seal structure, wherein end covers are fixedly arranged at two tail ends of a shell, a hollow cylinder is arranged in the middle of the shell, cylindrical pipes are fixedly arranged at the two end parts of the hollow cylinder, a plurality of bent pipes which are uniformly distributed are fixedly arranged on the outer surface of each cylindrical pipe along the circumferential direction, a straight pipe is fixedly arranged between each two corresponding bent pipes, a plurality of rotating sleeves which are uniformly distributed are fixedly sleeved on each straight pipe, fans are fixedly sleeved on the rotating sleeves, connecting pipes are fixedly welded at the opening parts of the outer side end parts of the cylindrical pipes, the tail ends of the outer sides of the connecting pipes extend outwards until the connecting pipes penetrate through the end covers, mounting rings are fixedly arranged on pipe bodies of the connecting pipes, which are positioned at the outer sides of the end covers, the. The invention has the advantages of good preheating effect and capability of preventing flue gas leakage.

Description

Air heater with air-tight seal structure

Technical Field

The invention relates to the technical field of air preheaters, in particular to an air preheater with an air sealing structure.

Background

The air preheater is a device which utilizes high-temperature flue gas and cold air to exchange heat, so that the temperature of the flue gas is reduced after heat is released, and the flue gas is sent into a chimney to be discharged; the temperature of the air is raised after the air absorbs heat, and the air is sent to equipment of a combustion system to participate in combustion. The method is widely applied to the field of recovery of the flue gas waste heat of the heating furnace. The existing air preheater is characterized in that smoke enters the preheater, the smoke passing speed is not fully delayed, the heat exchange time of the smoke and air is short, the air can not sufficiently absorb the heat of the smoke, and meanwhile, a sealing ring arranged between a connecting pipe and a shell in the air preheater is easy to leak the smoke due to the fact that the sealing ring is corroded by the smoke or the sealing ring is aged, so that the environment is polluted.

Disclosure of Invention

The invention aims to solve the defects that the heat exchange time of flue gas and air is short, and flue gas easily corrodes and ages a sealing ring to cause flue gas leakage in the prior art, and provides an air preheater with an air sealing structure.

In order to achieve the purpose, the invention adopts the following technical scheme:

the air preheater with the air sealing structure comprises a shell and end covers, wherein the end covers are fixedly mounted at two tail ends of the shell, a hollow cylinder is arranged in the middle of the shell and coaxially arranged in the shell, cylindrical pipes are fixedly mounted at two end parts of the hollow cylinder and coaxially arranged with the hollow cylinder, the outer side end part of each cylindrical pipe is in an opening design, a plurality of bent pipes which are uniformly distributed are fixedly mounted on the outer surface of each cylindrical pipe along the circumferential direction, the bent pipes are communicated with the inner part of each cylindrical pipe, a straight pipe is fixedly arranged between every two corresponding bent pipes, two tail ends of each straight pipe are inserted into the corresponding bent pipes, a plurality of rotating sleeves which are distributed at equal intervals are fixedly sleeved on each straight pipe, fans are fixedly sleeved on the rotating sleeves, and connecting pipes are fixedly welded at the outer side end part openings of the cylindrical pipes, the tail end of the outer side of each connecting pipe extends outwards until the connecting pipe penetrates through the end cover, a mounting ring is fixedly arranged on the pipe body of each connecting pipe, which is positioned on the outer side of the end cover, the connecting pipes are fixedly mounted on the outer surface of the end cover through bolts, an airtight structure is arranged on each end cover around the connecting pipe, a smoke outlet pipe is arranged on the upper portion of the outer wall of the shell in a penetrating mode, and a smoke inlet pipe is arranged on the lower portion of the outer wall of the shell.

Preferably, airtight structure includes first sealing washer, second sealing washer, the cover is equipped with first sealing ring on the connecting pipe between collar and the end cover, it has annular mounting groove to encircle the collar on the end cover surface, the bottom is equipped with the second sealing washer in the annular mounting groove, second sealing washer top is equipped with airtight piece, airtight top is provided with the third sealing washer, third sealing washer top is provided with solid fixed ring, gu fixed ring upper surface is opened along circumference equidistant has a plurality of mounting holes that run through solid fixed ring, third sealing washer, airtight piece, second sealing washer in proper order, the mounting hole lower extreme extends to inside the end cover after passing the second sealing washer, the connecting bolt with its looks adaptation is installed to equal screw thread in the mounting hole.

Preferably, the airtight piece includes airtight ring, ring channel, breather pipe, the ring channel has been opened along circumference to the airtight ring inner wall, fixed being equipped with on the outer terminal surface of airtight ring and the inside breather pipe that is linked together of ring channel, the outer tip of breather pipe outwards extends until passing third sealing washer, solid fixed ring, the outside port department screw thread of breather pipe installs sealed lid, it has high-pressure gas to let in through the breather pipe in the ring channel.

Preferably, the first sealing ring, the second sealing ring and the third sealing ring are made of high-temperature-resistant and corrosion-resistant rubber materials.

Preferably, the first sealing ring is a sealing ring with a T-shaped cross section, the outer end part of the first sealing ring is in contact with the fixing ring, and the connecting bolt on the fixing ring penetrates through the first sealing ring and is fixedly connected with the end cover

The air preheater with the air sealing structure has the beneficial effects that: through the arrangement of the straight pipe arranged around the hollow cylinder and the fan capable of rotating on the straight pipe, after the smoke is introduced into the shell, the smoke flowing upwards pushes the fan to rotate, and the rotating fan continuously stirs the rising smoke, so that the residence time of the smoke in the shell is fully delayed, the smoke can fully exchange heat with the air in the straight pipe, and the preheating efficiency is greatly improved;

through setting up the airtight structure who encircles the connecting pipe setting, utilize the high-pressure gas among the airtight structure to carry out effective separation to the flue gas that connecting pipe and end cover junction leaked, effectively stopped the flue gas in the casing and leaked.

Drawings

Fig. 1 is a schematic structural diagram of an air preheater with an airtight structure according to the present invention;

FIG. 2 is a schematic diagram illustrating an internal structure of an air preheater with an airtight structure according to the present invention;

FIG. 3 is a schematic cross-sectional view of an air preheater with an airtight structure according to the present invention;

FIG. 4 is a schematic diagram of a partial structure at A of an air preheater with an airtight structure according to the present invention;

FIG. 5 is a schematic structural diagram of an airtight structure of an air preheater with an airtight structure according to the present invention;

FIG. 6 is a first schematic structural diagram of an air seal of an air preheater with an air seal structure according to the present invention;

fig. 7 is a second schematic structural diagram of an air seal of an air preheater with an air seal structure according to the present invention.

In the figure: the device comprises a shell 1, an end cover 2, a hollow cylinder 3, a cylindrical pipe 4, an elbow pipe 5, a straight pipe 6, a fan 7, a connecting pipe 8, a mounting ring 9, an airtight structure 10, a first sealing ring 101, a second sealing ring 102, an airtight piece 103, an airtight ring 103a, an annular groove 103b, a vent pipe 103c, a third sealing ring 104, a fixing ring 105, a connecting bolt 106, a smoke outlet pipe 11, a smoke inlet pipe 12 and an annular mounting groove 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

Referring to fig. 1-5, an air preheater with an air-tight seal structure comprises a shell 1 and end covers 2, wherein the end covers 2 are fixedly mounted at two tail ends of the shell 1, and heat-insulating layers are sprayed on the outer surfaces of the shell 1 and the end covers 2 so as to reduce the loss of smoke heat. The middle part sets up hollow cylinder 3 in casing 1, and hollow cylinder 3's setting is in order to let the flue gas can carry out abundant heat exchange with the air in the straight tube 6. And hollow cylinder 3 is in the coaxial setting of casing 1, equal fixed mounting has cylinder pipe 4 on two tip of hollow cylinder 3, and cylinder pipe 4 and 3 coaxial settings of hollow cylinder, 4 outside end of cylinder pipe is the opening design, 4 surface edge circumference fixed mounting of cylinder pipe have evenly distributed's a plurality of return bends 5, return bend 5 all is linked together with cylinder pipe 4 is inside, all fixed being provided with straight tube 6 between per two return bends 5 that correspond, two ends of straight tube 6 all insert in the return bend 5 that corresponds, equal fixed cover is equipped with a plurality of rotation cover of equidistant distribution on every straight tube 6, return bend 5 and straight tube 6 are the high thermal conductivity metal and make, straight tube 6 is interference fit with return bend 5. It is equipped with fan 7 to sheathe equal fixed cover in to rotate, the equal fixed welding of 4 outside end openings of cylinder pipe has connecting pipe 8, the terminal all outwards extends until passing end cover 2 in every connecting pipe 8 outside, every connecting pipe 8 is located all fixed being equipped with collar 9 on the body in the end cover 2 outside, installation 9 is all through bolt fixed mounting on end cover 2 surface, all be provided with airtight structure 10 around connecting pipe 8 on every end cover 2, 1 outer wall upper portion of casing runs through and is equipped with out tobacco pipe 11, 1 outer wall lower part of casing runs through and is equipped with into tobacco pipe 12.

The airtight structure 10 comprises a first sealing ring 101 and a second sealing ring 102, the connecting pipe 8 between the mounting ring 9 and the end cover 2 is sleeved with the first sealing ring 101, the outer surface of the end cover 2 is provided with an annular mounting groove 13 surrounding the mounting ring 9, the bottom in the annular mounting groove 13 is provided with the second sealing ring 102, an airtight piece 103 is arranged above the second sealing ring 102, a third sealing ring 104 is arranged above the airtight piece 103, a fixing ring 105 is arranged above the third sealing ring 104, the upper surface of the fixing ring 105 is provided with a plurality of fixing rings 105 and third sealing rings 104 which sequentially penetrate through the fixing ring 105 and the third sealing ring 104 at equal, the lower ends of the installation holes of the airtight piece 103 and the second seal ring 102 penetrate through the second seal ring 102 and then extend into the end cover 2, the installation holes are internally provided with connecting bolts 106 matched with the installation holes in a threaded manner, and the second seal ring 102 and the third seal ring 104 are mainly used for preventing high-pressure gas in the airtight piece 103 from leaking.

The first sealing ring 101, the second sealing ring 102 and the third sealing ring 104 are made of high-temperature-resistant and corrosion-resistant rubber materials, and the influence of high-temperature and high-corrosion smoke on the sealing rings can be fully reduced.

The first sealing ring 101 is a sealing ring with a T-shaped cross section, the outer end part of the first sealing ring 101 is in contact with the fixing ring 9, and the connecting bolt 106 on the fixing ring 9 penetrates through the first sealing ring 101 and then is fixedly connected with the end cover 2.

When the invention is used, the smoke inlet pipe 12 is communicated with the smoke subjected to dust removal treatment, the smoke outlet pipe 11 is connected with the smoke treatment device, the outer ports of the two connecting pipes 8 are respectively connected with the air input device and the boiler air inlet, and when the smoke inlet pipe 12 is introduced with the smoke, the smoke rising in the shell 1 continuously pushes the fan 7 on the straight pipe 6 to rotate, so that the rising smoke flow is disturbed by the rotating fan, the residence time of the smoke in the shell 1 is further prolonged, and the smoke can be subjected to sufficient heat exchange with the air in the straight pipe 6. The high-pressure gas filled in the annular groove 103b in the airtight structure 10 can effectively isolate the smoke from leaking out through the gap between the connecting pipe 8 and the end cover 2.

Example 2

Referring to fig. 6 to 7, as another preferred embodiment of the present invention, the difference from embodiment 1 is that the airtight member 103 includes an airtight ring 103a, an annular groove 103b, and a vent pipe 103c, the inner wall of the airtight ring 103a is circumferentially provided with the annular groove 103b, the outer end surface of the airtight ring 103b is fixedly provided with the vent pipe 103c communicated with the inside of the annular groove 103b, the outer end of the vent pipe 103c extends outward until it passes through a third seal ring 104 and a fixing ring 105, the outer end of the vent pipe 103c is threadedly provided with a sealing cover, and high-pressure gas is introduced into the annular groove 103b through the vent pipe 103 c. By introducing high-pressure gas into the airtight member 103 through the vent pipe 103c, the operation is very convenient, the pressure of the high-pressure gas can be checked at regular time in the daily use process, and when the pressure is found to be reduced, the high-pressure gas is filled through the vent pipe 103c in time.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The air preheater with the air sealing structure comprises a shell (1) and end covers (2), and is characterized in that the end covers (2) are fixedly mounted at two tail ends of the shell (1), a hollow cylinder (3) is arranged at the middle part in the shell (1), the hollow cylinder (3) is coaxially arranged in the shell (1), cylindrical pipes (4) are fixedly mounted at two end parts of the hollow cylinder (3), the cylindrical pipes (4) are coaxially arranged with the hollow cylinder (3), the outer end parts of the cylindrical pipes (4) are both in an open design, a plurality of bent pipes (5) which are uniformly distributed are fixedly mounted on the outer surface of the cylindrical pipes (4) along the circumferential direction, the bent pipes (5) are communicated with the inside of the cylindrical pipes (4), and straight pipes (6) are fixedly arranged between every two corresponding bent pipes (5), two tail ends of the straight pipes (6) are inserted into the corresponding bent pipes (5), a plurality of rotating sleeves which are distributed at equal intervals are fixedly sleeved on each straight pipe (6), the rotating sleeves are fixedly sleeved with fans (7), connecting pipes (8) are fixedly welded at openings of the outer side ends of the cylindrical pipes (4), the tail ends of the outer sides of the connecting pipes (8) extend outwards until the connecting pipes penetrate through the end covers (2), mounting rings (9) are fixedly arranged on pipe bodies of the connecting pipes (8) positioned on the outer sides of the end covers (2), the installation devices (9) are fixedly installed on the outer surfaces of the end covers (2) through bolts, an airtight structure (10) is arranged on each end cover (2) in a surrounding mode around the connecting pipe (8), the upper part of the outer wall of the shell (1) is provided with a smoke outlet pipe (11) in a penetrating way, and the lower part of the outer wall of the shell (1) is provided with a smoke inlet pipe (12) in a penetrating way.

2. The air preheater with the air-tight sealing structure according to claim 1, wherein the air-tight sealing structure (10) comprises a first sealing ring (101) and a second sealing ring (102), a first sealing ring (101) is sleeved on a connecting pipe (8) between the mounting ring (9) and the end cover (2), an annular mounting groove (13) is formed in the outer surface of the end cover (2) and surrounds the mounting ring (9), a second sealing ring (102) is arranged at the bottom in the annular mounting groove (13), an air-tight piece (103) is arranged above the second sealing ring (102), a third sealing ring (104) is arranged above the air-tight piece (103), a fixing ring (105) is arranged above the third sealing ring (104), and the upper surface of the fixing ring (105) is provided with a plurality of fixing rings (105), third sealing rings (104) and third sealing rings (104) which sequentially penetrate through the fixing rings (105) and, The lower end of the mounting hole penetrates through the second sealing ring (102) and then extends into the end cover (2), and connecting bolts (106) matched with the mounting hole are mounted in the mounting hole in a threaded mode.

3. The air preheater with the air-tight sealing structure according to claim 2, wherein the air-tight member (103) comprises an air-tight ring (103a), an annular groove (103b) and a vent pipe (103c), the annular groove (103b) is formed in the inner wall of the air-tight ring (103a) along the circumferential direction, the vent pipe (103c) communicated with the inside of the annular groove (103b) is fixedly arranged on the outer end face of the air-tight ring (103b), the outer end of the vent pipe (103c) extends outwards until the outer end passes through the third sealing ring (104) and the fixing ring (105), a sealing cover is threadedly mounted at the outer side port of the vent pipe (103c), and high-pressure gas is introduced into the annular groove (103b) through the vent pipe (103 c).

4. An air preheater with an airtight structure, according to claim 2, characterized in that the first sealing ring (101), the second sealing ring (102) and the third sealing ring (104) are made of high temperature resistant and corrosion resistant rubber.

5. The air preheater with the air sealing structure is characterized in that the first sealing ring (101) is a sealing ring with a T-shaped cross section, the outer end of the first sealing ring (101) is in contact with a fixing ring (9), and a connecting bolt (106) on the fixing ring (9) penetrates through the first sealing ring (101) and then is fixedly connected with the end cover (2).