CN210135800U - Tube bundle type gas heat exchanger capable of preventing dew point corrosion - Google Patents
Tube bundle type gas heat exchanger capable of preventing dew point corrosion Download PDFInfo
- Publication number
- CN210135800U CN210135800U CN201920990536.0U CN201920990536U CN210135800U CN 210135800 U CN210135800 U CN 210135800U CN 201920990536 U CN201920990536 U CN 201920990536U CN 210135800 U CN210135800 U CN 210135800U
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- heat
- heat transfer
- dew point
- casing
- heat exchange
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- 238000005260 corrosion Methods 0.000 title claims abstract description 12
- 230000007797 corrosion Effects 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003546 flue gas Substances 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 abstract description 10
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000001833 catalytic reforming Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
The utility model provides a can prevent dew point corrosion's tube bundle gas heat exchanger, includes the casing, sets up a plurality of heat transfer passageways in the casing, a plurality of heat transfer passageways are used for cold air to flow, space between a plurality of heat transfer passageways and the casing is used for hot flue gas to flow, and the inside that is close to hot exhanst gas outlet's a plurality of heat transfer pipeline entry end sets up the heat insulating part, the heat insulating part has the cavity that is used for cold air to get into the heat transfer passageway, and its entrance point is loudspeaker form, and its exit end is equipped with a plurality of elastic support legs along the circumferencial direction, and every elastic support leg has outwards buckles and be used for the tip with the inseparable butt of inner wall of heat exchange tube. The existence of the heat insulation piece enables two kinds of gas with different temperatures not to exchange heat in the area of the heat exchange channel close to the inlet end, so that the temperature of the heat exchange channel is prevented from being lower than the acid dew point temperature, the acid dew point corrosion is avoided, and the service life of the equipment is prolonged.
Description
Technical Field
The utility model belongs to the technical field of the heat exchanger, concretely relates to trades such as petrochemical industry, electric power are used for tube bundle gas heat exchanger of high temperature flue gas heat transfer.
Background
A gas heat exchanger is an apparatus for exchanging heat between a relatively high-temperature gas and a relatively low-temperature gas. Gas heat exchangers, such as air preheaters and flue gas air coolers, are commonly used in the petrochemical, electrical, and other industries. Air preheaters are commonly used for boiler flue gas waste heat recovery, wherein air is preheated by heat exchange with high temperature flue gas through the air preheater before being used for combustion. The flue gas air cooler can be used in a catalyst regeneration system of a catalytic reforming unit. One problem in gas heat exchangers such as air preheaters and flue gas air coolers is that the flue gas contains components such as HCl and Cl2、SO2When the acidic gas components are used in the flue gas cooling process, the flue gas is prevented from being condensed to generate acid dew point corrosion, and the service life of equipment is shortened.
Disclosure of Invention
An object of the utility model is to provide a can prevent dew point corrosion's tube bundle gas heat exchanger.
The purpose of the utility model is realized by adopting the following technical scheme. The foundation the utility model provides a can prevent tube bundle gas heat exchanger of dew point corrosion, including casing, a plurality of heat transfer passageways of setting in the casing, a plurality of heat transfer passageways are used for the cold air to flow, space between a plurality of heat transfer passageways and the casing is used for hot flue gas to flow, and the inside of a plurality of heat transfer pipeline entry end that is close to hot flue gas outlet sets up thermal-insulated piece, thermal-insulated piece has the cavity that is used for the cold air to get into heat transfer passageway, and its entrance point is the loudspeaker form, and its exit end is equipped with a plurality of elastic support legs along the circumferencial direction, and every elastic support leg has outwards buckles and be used for when thermal-insulated piece inserts heat transfer passageway inside with the tip of the inseparable butt of inner wall of.
The utility model provides a gas heat exchanger sets up the heat insulating part in the inside of being close to hot exhanst gas outlet's heat transfer passageway entry end, and the existence of heat insulating part makes two kinds of gases of temperature difference not carry out the heat exchange in the region that aforementioned heat transfer passageway is close to the entry end, prevents that heat transfer passageway's temperature is less than acid dew point temperature, avoids the emergence of acid dew point corruption to the life of extension equipment.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic cross-sectional view of two heat exchange tubes near the flue gas outlet in the heat exchanger of the present invention.
Fig. 2 is a schematic end view of a septum of the present invention.
[ description of main element symbols ]
1-shell
2-heat exchange tube
3-Heat insulation
301-resilient support leg
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, a tube bundle type gas heat exchanger capable of preventing dew point corrosion includes a housing 1 and a plurality of heat exchange tubes 2 disposed in the housing 1 and perpendicular to an axis of the housing, wherein cold air (i.e., relatively low temperature gas) flows laterally along an inside of the heat exchange tubes 2, hot flue gas (i.e., relatively high temperature gas) flows longitudinally along a space between the housing 1 and the heat exchange tubes 2, and two kinds of gas having different temperatures exchange heat through outer walls of the heat exchange tubes 2.
When cold air flows through the inside of the heat exchange tube 2 and hot flue gas flows through the outside of the heat exchange tube 2, the temperature of the air in the channel is lowest in the area close to the inlet end of the heat exchange tube 2, and the temperature of the outer wall of the tube is lower than the acid dew point temperature, so that acid dew point corrosion is easy to occur on the outer wall of the heat exchange tube 2; along with the gradual approach to the outlet end of the heat exchange tube 2, the temperature of the air in the tube gradually rises, and the temperature of the outer wall of the heat exchange tube 2 tends to rise, so that the acid dew point corrosion is not easy to occur. Meanwhile, along the flowing direction of hot flue gas, the temperature of the flue gas flowing through the outer surface of the heat exchange tube 2 is gradually reduced, the surface temperature of the heat exchange tube 2 is correspondingly gradually reduced along the flowing direction of the flue gas, and the area of the outer surface of the heat exchange tube, which is easy to generate acid dew point corrosion, is gradually prolonged and distributed in a gradient manner.
Therefore, please refer to fig. 2, the present invention inserts a heat insulation member 3 in the inside of the inlet end of a plurality of heat exchange tubes 2 close to the hot flue gas outlet, and with the help of the existence of the heat insulation member 3, when the hot flue gas flows through the heat exchange tubes 2 inserted with the heat insulation member, the hot flue gas can only exchange heat with the outer surface of the heat exchange tube far away from the inlet end, but can not exchange heat with the outer surface of the heat exchange tube close to the inlet end, so that the outer wall of the heat exchange tube close to the inlet end is at a higher temperature and higher than the acid dew point temperature.
The inside of the heat insulation piece 3 is provided with a cavity along the axial direction, and the cavity is used for cold air to enter the heat exchange tube. The inlet end of the heat insulating part 3 (namely the end part close to the inlet end of the heat exchange tube when the heat insulating part is inserted into the heat exchange tube) is trumpet-shaped, the outlet end (namely the end part far away from the inlet end of the heat exchange channel when the heat insulating part is inserted into the heat exchange tube) is provided with a plurality of elastic supporting legs 301 with elastic deformation capacity along the circumferential direction, the end part of each elastic supporting leg 301 is outwards bent towards the direction far away from the axis of the heat insulating part 3, the diameter of the circle formed by the end parts of the elastic supporting legs 301 is larger than the size of the inner wall of the heat exchange tube, and when the heat insulating part is inserted into the heat exchange tube, the end parts of the elastic supporting legs 301 are tightly abutted against the.
The heat exchange tube 2 in this embodiment is used as a heat exchange channel, and the heat exchange channel may also be a heat exchange plate or other gas flow channels with different existing forms.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art can easily modify, change or modify the above embodiments according to the technical spirit of the present invention without departing from the scope of the present invention.
Claims (1)
1. The utility model provides a can prevent dew point corrosion's tube bundle gas heat exchanger, includes the casing, sets up a plurality of heat transfer passageways in the casing, a plurality of heat transfer passageways are used for cold air to flow, space between a plurality of heat transfer passageways and the casing is used for hot flue gas to flow, and the inside that its characterized in that is close to a plurality of heat transfer pipeline entry end of hot exhanst gas outlet sets up the heat insulating part, the heat insulating part has the cavity that is used for cold air to get into heat transfer passageway, and its entrance point is the loudspeaker form, and its exit end is equipped with a plurality of elastic support legs along the circumferencial direction, and every elastic support leg has outwards buckles and be used for when the heat insulating part inserts heat transfer passageway inside with the tip of the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920990536.0U CN210135800U (en) | 2019-06-26 | 2019-06-26 | Tube bundle type gas heat exchanger capable of preventing dew point corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920990536.0U CN210135800U (en) | 2019-06-26 | 2019-06-26 | Tube bundle type gas heat exchanger capable of preventing dew point corrosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210135800U true CN210135800U (en) | 2020-03-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920990536.0U Active CN210135800U (en) | 2019-06-26 | 2019-06-26 | Tube bundle type gas heat exchanger capable of preventing dew point corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210135800U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984547A (en) * | 2021-04-28 | 2021-06-18 | 北京国电电力有限公司新疆米东热电厂 | Air preheater |
-
2019
- 2019-06-26 CN CN201920990536.0U patent/CN210135800U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984547A (en) * | 2021-04-28 | 2021-06-18 | 北京国电电力有限公司新疆米东热电厂 | Air preheater |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 201104 room 701, floor 7, No. 418, Guiping Road, Xuhui District, Shanghai Patentee after: Rachel Petrochemical Engineering (Shanghai) Co.,Ltd. Address before: 201104 station 09, 1st floor, building 27, 487 Tianlin Road, Xuhui District, Shanghai Patentee before: INTERE PETROCHEMICAL EQUIPMENT (SHANGHAI) Co.,Ltd. |