CN201145493Y - New tubular air preheater - Google Patents

Abstract

The utility model relates to a tube type gas heat exchanger. It solves the current problem that there are solid particles and corrosive substances in high-temperature fluids, such as dust and sulfur dioxide. Due to the limitations and irrationality of its existing structure, the inlet of the tube bundle is prone to wear and leakage, which makes the air preheater Insufficient such as short service life. Technical measures: the utility model is mainly composed of: tube bundle (1), cover plate (2) and bottom plate (3) for fixing tube bundle (1), air channel (4), lower partition (5), upper partition (7) 1. The lower air channel block plate (10) is composed of: between the bottom plate (3) and the tube bundle (1) and communicated with the tube bundle (1) to connect the high-temperature fluid outlet tube bundle (11); between the cover plate (2) and the tube bundle (1) is connected to the high-temperature fluid inlet tube bundle (6) in communication with the tube bundle (1); the high-temperature fluid inlet tube bundle (6) between the cover plate (2) and the upper partition (7) is connected with an upper side sealing plate (8), the high-temperature fluid outlet tube bundle (11) between the bottom plate (3) and the lower partition (5) is connected with a lower side sealing plate (9).

Description

New tubular air preheater

technical field

The utility model relates to a heat exchanger, which belongs to a heat exchanger whose service life can be extended after the low-temperature part of a tubular gas heat exchanger corrodes and causes certain leakage.

Background technique

The common air preheater in the current industrial production is composed of a cover plate, a bottom plate and a tube bundle. Air scours laterally outside the tubes, and high-temperature fluid (such as flue gas) flows through the tubes to undergo surface heat exchange. Especially for solid particles and corrosive substances (such as dust and sulfur dioxide) in the high-temperature fluid, due to the limitation and irrationality of its structure, the inlet of the tube bundle is prone to wear, and the low-temperature part of the outlet is prone to low-temperature corrosion, resulting in leakage , so that the heat exchange efficiency is reduced, which affects the normal operation of the equipment, shortens the service life of the air preheater, and increases the production cost.

Utility model content

The utility model aims at overcoming the above-mentioned disadvantages, and provides a method that can prevent wear and leakage in the effective heat transfer area of the high-temperature fluid inlet, and under the condition that the heat transfer rate can be met, by isolating part of the leakage part of the heat transfer area, the air preheating can be extended. A new type of tubular air preheater with longer service life of the heater.

Technical measures to solve the above problems:

The new tubular air preheater is mainly composed of a tube bundle, a cover plate and a bottom plate for fixing the tube bundle, an air channel, a lower partition, an upper partition, and a lower air channel blocking plate. It consists of: connecting the high-temperature fluid outlet tube bundle between the bottom plate and the tube bundle and communicating with the tube bundle; connecting the high-temperature fluid inlet tube bundle between the cover plate and the tube bundle; connecting the high-temperature fluid inlet tube bundle between the cover plate and the upper partition An upper side sealing plate is connected, and a lower side sealing plate is connected outside the high-temperature fluid outlet tube bundle between the bottom plate and the lower partition.

The reason is that the high-temperature fluid outlet tube bundle ports of the bottom plate and the high-temperature fluid inlet tube bundle ports of the cover plate are also provided with plugs.

It is that: an upper air channel blocking plate is installed between the cover plate and the upper partition plate.

The utility model can reduce the damage caused by the wear and low-temperature corrosion of the air preheater, prolong the service life, has the advantages of simple structure, convenient maintenance and small maintenance workload.

Description of drawings

Figure 1 is a schematic diagram of the structure of the new tubular air preheater

Figure 2 is a schematic diagram of the top view of Figure 1

Figure 3 is a schematic diagram of the state of plugging after the tube bundle is corroded and worn

Detailed ways

Describe in detail in conjunction with the accompanying drawings:

Example

In the new tubular air preheater, the length of the high-temperature fluid inlet tube bundle (6) is determined according to the position where particles in the high-temperature fluid impact the tube bundle when the high-temperature fluid enters the tube bundle, and the length is generally 150-300 mm. When processing the tube bundle (1), it is 300-600 mm longer than the normal length as the high-temperature fluid inlet tube bundle (6) and the high-temperature fluid outlet tube bundle (11); respectively process the cover plate (2) and bottom plate (3) of the same shape, and the lower partition plate (5) and upper partition (7); on the cover plate (2), lower partition (5) and upper partition (7), holes with the same diameter as the tube bundle (1) are processed; The high-temperature fluid outlet tube bundle (11) of the tube bundle (1) is welded or tightened and installed on the bottom plate (3), and the lower partition (5) is tightly fitted to the high-temperature fluid outlet tube bundle at a distance of 200 to 300 mm from the bottom plate (3). (11) The upper end is then reinforced by welding or expansion. The lower partition (5) and the bottom plate (3) are parallel to each other; the upper partition (7) is tightly fitted to the end of the high-temperature fluid inlet tube bundle (6) , and then welded or tightened reinforcement, and installed parallel to each other with the cover plate (2). Since the preheater is installed in a closed place such as the flue, in order to facilitate maintenance and isolate the high-temperature fluid inlet and outlet tube bundles from the outside world, the warm fluid outlet tube bundle between the bottom plate (3) and the lower partition (5) ( 11), the outer side of the warm fluid inlet tube bundle (6) between the cover plate (2) and the upper partition (7) is respectively welded or bolted to the lower side sealing plate (9) and the upper side sealing plate (8) .

When the end of the high-temperature fluid inlet tube bundle (6) connected to the cover plate (2) will leak due to wear and tear, use the matching plug (12) on this port to seal the leaked warm fluid inlet tube bundle (6) port and the corresponding temperature Fluid outlet tube bundle (11) mouth plugging; Make high-temperature fluid no longer flow through this place.

When the end of the high-temperature fluid outlet tube bundle (11) connected to the bottom plate (3) will leak due to corrosion, use the matching plug (12) to seal the leaked warm fluid outlet tube bundle (11) and the corresponding warm fluid The inlet tube bundle (6) is blocked; the high-temperature fluid no longer flows through this place.

For air preheaters with high working temperature and many solid particles, the effect of wear is much greater than that of low temperature corrosion. When the end of the warm fluid inlet tube bundle (6) connected to the cover plate (2) will leak due to wear and tear, the number of blockages (8) will reach the standard for scrapping the air preheater (the blocked area is greater than or equal to the total heat exchange area 10%), install the upper air channel blocking plate (13) with the same structural shape as the cover plate (2) between the upper partition (7) and the cover plate (2), so that the air flow channel is changed to the bottom plate (3 ) and the upper partition (7), no longer flow through the worn leakage. At this time, the blockage (12) can be pulled out to improve the heat exchange efficiency and no longer leak.

For air preheaters with low working temperature and few solid particles, the impact of low temperature corrosion is much greater than that of wear. When the end of the warm fluid outlet tube bundle (11) connected to the bottom plate (3) will leak due to corrosion and the number of blocked (12) reaches the standard for scrapping the air preheater (the blocked area is greater than or equal to the total heat exchange area) 10%), install the lower air channel blocking plate (10) with the same structural shape as the base plate (3) between the lower partition (5) and the bottom plate (3), so that the air flow channel is changed to cover plate (2) and lower Between the partitions (5), no longer flow through the corroded leakage. At this time, the blockage (12) can be pulled out to improve the heat exchange efficiency and no longer leak.

When the amount of leakage caused by corrosion and wear is blocked by the blockage (8) reaches the standard for scrapping the air preheater (the blocked area is greater than or equal to 10% of the total heat exchange area), the air flow channel (4) is the upper partition Between the plate (7) and the lower partition (5), the air no longer flows through the corroded and worn leak. At this time, the blockage (12) can be completely removed, so that the heat exchange efficiency is improved and no leakage occurs.

Claims (3)

1, New Type of Tubular Air Preheater, mainly form, it is characterized in that: between base plate (3) and tube bank (1) and with tube bank (1), be connected high temperature fluid outlet tube bank (11) by cover plate (2) and base plate (3), air duct (4), lower clapboard (5), upper spacer (7), the following air duct closure plate (10) of tube bank (1), fixing tube bank (1); Between cover plate (2) and tube bank (1) and with tube bank (1), be connected high temperature fluid import tube bank (6); High temperature fluid import tube bank (6) between cover plate (2) and the upper spacer (7) is externally connected with side seal board (8), and the high temperature fluid outlet tube bank (11) between base plate (3) and the lower clapboard (5) is externally connected with down side seal board (9).

2, New Type of Tubular Air Preheater as claimed in claim 1 is characterized in that: high temperature fluid inlet tube bank (6) port of high temperature fluid outlet tube bank (11) port of base plate (3) and cover plate (2) also is equipped with obstruction (12).

3, New Type of Tubular Air Preheater as claimed in claim 1 is characterized in that: between cover plate (2) and the upper spacer (7) air duct closure plate (13) is housed.

Images