CN219531809U - Online water flushing device of air preheater - Google Patents
Online water flushing device of air preheater Download PDFInfo
- Publication number
- CN219531809U CN219531809U CN202320358318.1U CN202320358318U CN219531809U CN 219531809 U CN219531809 U CN 219531809U CN 202320358318 U CN202320358318 U CN 202320358318U CN 219531809 U CN219531809 U CN 219531809U
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- flue gas
- gas outlet
- water
- air preheater
- header tank
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Chimneys And Flues (AREA)
Abstract
The utility model relates to an online water flushing device of an air preheater, which comprises the air preheater, a flue gas outlet header tank and water flushing pipes, wherein the flue gas outlet end of the air preheater is connected with the top of the flue gas outlet header tank, a plurality of water flushing pipes are uniformly distributed above heat exchange elements of a low-temperature section of the air preheater, a groove-shaped water spraying port is formed in the bottom of each water flushing pipe, flushing water is downwards sprayed out in a fan shape through the groove-shaped water spraying port, a water flow baffle is arranged in the flue gas outlet header tank, the top end of each water flow baffle is connected with the top of one side wall of the flue gas outlet header tank, a flue gas outlet is formed in the side wall of the flue gas outlet header tank, the flue gas outlet header tank is divided into a left cavity and a right cavity by the water flow baffle, and the bottoms of the two cavities are communicated. The utility model can wash the heat exchange element in the low temperature section of the air preheater with water to clean ash at any time in the running process of the air preheater without waiting for shutdown of the device; the flushing medium can be normal-temperature tap water, and has low requirements on site water source conditions.
Description
Technical Field
The utility model relates to the technical field of petroleum refining and petrochemical industry, in particular to an online water flushing device of an air preheater, which is applied to a flue gas waste heat recovery system in the petroleum refining and petrochemical industry.
Background
The air preheater is a heat exchanger for preheating air by using the heat of exhaust gas from a heating furnace or the like. The method has the effects of reducing the exhaust gas temperature of equipment such as a heating furnace and the like, improving the heat efficiency, enabling fuel to be easy to catch fire, stabilizing combustion and improving the combustion efficiency.
Because the surface of the internal heat exchange element of the low-temperature section of the air preheater is easy to generate accumulated ash in the long-period operation process, the heat exchange efficiency of the air preheater can be influenced along with the increase of accumulated ash, and therefore the internal heat exchange element generating the accumulated ash needs to be cleaned regularly. At present, the ash removal mode of the low-temperature section of the air preheater in the flue gas waste heat recovery system in the domestic petroleum refining and petrochemical industry mainly comprises off-line water flushing, namely the heat exchange element in the air preheater can be flushed when the device is required to be stopped and overhauled. However, the device is generally free from special conditions in the middle of the long-period operation process, and can not be stopped, and some devices with poor fuel are gradually increased and solidified along with the extension of the operation time, so that the dust deposited on the surface of the heat exchange element in the air preheater is difficult to clean up until the device is stopped for maintenance. The flushing medium of an off-line water flushing system is usually hot water, and the requirements on site water source conditions are high.
Disclosure of Invention
The utility model aims to overcome the defects, and provides an online water flushing device for an air preheater, which can realize online water flushing of heat exchange elements in a low-temperature section of the air preheater at any time in the running process of the device, reduce the cleaning difficulty of ash accumulation of the air preheater and has lower requirements on water source conditions.
The purpose of the utility model is realized in the following way:
the utility model provides an online water washing unit of air heater, includes air heater, flue gas outlet header tank and water flushing pipe, air heater's flue gas outlet connects the top of flue gas outlet header tank, and a plurality of water flushing pipe evenly distributed is above the heat transfer component of air heater low temperature section, slot form water jet has been seted up to water flushing pipe bottom, and the sparge water is fan-shaped blowout downwards through slot form water jet, flue gas outlet header tank inside is equipped with the rivers baffle, a side wall top of flue gas outlet header tank is connected on the rivers baffle top, is equipped with the flue gas outlet at this lateral wall, and two cavities about the water flow baffle separates the flue gas outlet header tank, and two cavity bottoms intercommunication.
Preferably, the bottom of the flue gas outlet header tank is connected with a U-shaped automatic drain valve.
Preferably, the U-shaped automatic drain valve is internally provided with a one-way baffle valve.
Preferably, the flue gas outlet is provided with a flue gas demister.
Preferably, the waterproof heat preservation layer is coated inside the wall plate of the flue gas outlet header box.
Preferably, the slot-shaped water spraying ports are uniformly distributed in the length direction of the water flushing pipe in a pairwise combined mode, and each group of slot-shaped water spraying ports corresponds to each heat exchange element in the low-temperature section of the air preheater one by one.
Preferably, the bottom end of the water flow baffle is lower than the flue gas outlet.
The beneficial effects of the utility model are as follows:
1. the water flushing and ash removal can be carried out on the heat exchange element in the low-temperature section of the air preheater at any time in the operation process of the air preheater, and the waiting for shutdown of the device is not needed;
2. the flushing medium can be normal-temperature tap water, and the requirements on site water source conditions are not high;
3. the water flow baffle and the smoke demister jointly act to prevent water from flowing through smoke to be sucked into the induced draft fan, and meanwhile residual moisture in the smoke is filtered out to prevent the residual moisture in the smoke from corroding the induced draft fan at the tail part.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
FIG. 2 is a schematic diagram of the positional relationship between the water flush tube and the low temperature section of the air preheater.
Fig. 3 is a side view of a water flush tube.
Fig. 4 is a cross-sectional view A-A of fig. 3.
Fig. 5 is a schematic structural view of the flue gas outlet header tank.
Wherein: an air preheater 1; a flue gas outlet header tank 2; a water flow baffle 2.1; a flue gas outlet 2.2; 2.3 parts of waterproof heat-insulating layer; a water flushing pipe 3; a groove-shaped water jet 3.1; a mounting frame 4; u-shaped automatic drain valve 5; a one-way flapper valve 5.1; flue gas mist eliminator 6.
Description of the embodiments
Referring to fig. 1-5, the utility model relates to an online water flushing device of an air preheater, which comprises the air preheater 1, a flue gas outlet header tank 2 and water flushing pipes 3, wherein the air preheater 1 and the flue gas outlet header tank 2 are arranged on a mounting frame 4 up and down, the air preheater 1 is divided into a high-temperature section and a low-temperature section, the flue gas outlet end of the air preheater 1 is connected with the top of the flue gas outlet header tank 2, a plurality of water flushing pipes 3 are uniformly distributed above heat exchange elements of the low-temperature section of the air preheater 1, the water flushing pipes 3 are perpendicular to the low-temperature Duan Huanre elements of the air preheater 1, slot-shaped water spraying ports 3.1 are formed in the bottom of the water flushing pipes 3, flushing water is sprayed downwards in a fan shape through the slot-shaped water spraying ports 3.1, the slot-shaped water spraying ports 3.1 are uniformly distributed in the length direction of the water flushing pipes 3 in a two-by two combination mode, and each group of the slot-shaped water spraying ports 3.1 are in one-to-one correspondence with each heat exchange element of the low-temperature section of the air preheater.
The water flushing pipe 3 adopts normal-temperature flushing water, the temperature of the flue gas in the low-temperature section of the air preheater 1 is generally 80-200 ℃, the water outlet flow of the flushing water is 33L/min, and the normal-temperature flushing water can be changed into required hot water after being contacted with hot flue gas.
The flue gas outlet header tank 2 is internally provided with a water flow baffle plate 2.1, the top end of the water flow baffle plate 2.1 is connected with the top of a side wall of the flue gas outlet header tank 2, the side wall is provided with a flue gas outlet 2.2, the water flow baffle plate 2.1 divides the flue gas outlet header tank 2 into a left cavity and a right cavity, and the bottoms of the two cavities are communicated. The bottom of the water flow baffle plate 2.1 is lower than the smoke outlet 2.2, and the water flow baffle plate 2.1 can enable the washed wastewater to be collected at the bottom of the smoke outlet header tank 2, so that the water is prevented from flowing through the smoke suction induced draft fan.
The automatic drain valve 5 of U type is connected to flue gas outlet header tank 2 bottom, the automatic drain valve 5 of U type can make the waste water that gathers in flue gas outlet header tank 2 bottom discharge by oneself, and whole journey possesses the inside flue gas of air heater and the isolated effect of outside air simultaneously, the automatic drain valve 5 of U type need not manual operation, can avoid the risk of hot waste water scald in the online water flushing process. The U-shaped automatic drain valve 5 is internally provided with a one-way baffle valve 5.1, so that internal water flow can only flow in one direction.
The flue gas outlet 2.2 is provided with a flue gas demister 6, the flue gas demister 6 can filter residual moisture in flue gas, and the residual moisture in the flue gas is prevented from corroding a tail induced draft fan.
The waterproof heat preservation layer 2.3 is coated inside the wall plate of the flue gas outlet header tank 2, so that erosion of water flow to the heat preservation layer is avoided.
The flue gas enters the flue gas outlet liquid collection box after entering the low-temperature section from the high-temperature section of the air preheater 1, flushing water is sprayed out from a water flushing pipe arranged above a low-temperature Duan Huanre element of the air preheater, a low-temperature Duan Huanre element below the air preheater is flushed, the flushed waste water is collected in the flue gas outlet liquid collection box at the bottom and is discharged through a U-shaped automatic drain valve, and finally the flue gas is blocked by a water flow baffle plate and is filtered by a flue gas demister and then discharged to a chimney.
In addition to the above embodiments, the present utility model also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present utility model.
Claims (7)
1. An on-line water flushing device of an air preheater is characterized in that: including air heater, flue gas outlet header tank and water flushing pipe, air heater's flue gas outlet end connects the top of flue gas outlet header tank, and a plurality of water flushing pipe evenly distributed is in air heater low temperature section's heat transfer component top, slot form water jet has been seted up to water flushing pipe bottom, and the sparge water is fan-shaped blowout downwards through slot form water jet, inside rivers baffle that is equipped with of flue gas outlet header tank, a lateral wall top of flue gas outlet header tank is connected on rivers baffle top, is equipped with the flue gas outlet at this lateral wall, and two cavities about the flue gas outlet header tank is separated into to the rivers baffle, and two cavity bottoms intercommunication.
2. An on-line water flushing device for an air preheater as set forth in claim 1, wherein: the bottom of the flue gas outlet liquid collecting box is connected with a U-shaped automatic drain valve.
3. An on-line water flushing device for an air preheater as set forth in claim 2, wherein: the U-shaped automatic drain valve is internally provided with a one-way baffle valve.
4. An on-line water flushing device for an air preheater as set forth in claim 1, wherein: the flue gas outlet is provided with a flue gas demister.
5. An on-line water flushing device for an air preheater as set forth in claim 1, wherein: the waterproof heat preservation layer is coated inside the wall plate of the flue gas outlet liquid collecting box.
6. An on-line water flushing device for an air preheater as set forth in claim 1, wherein: the groove-shaped water spray openings are uniformly distributed in the length direction of the water flushing pipe in a pairwise combined mode, and each group of groove-shaped water spray openings corresponds to each heat exchange element in the low-temperature section of the air preheater one by one.
7. An on-line water flushing device for an air preheater as set forth in claim 1, wherein: the bottom end of the water flow baffle is lower than the flue gas outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320358318.1U CN219531809U (en) | 2023-03-02 | 2023-03-02 | Online water flushing device of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320358318.1U CN219531809U (en) | 2023-03-02 | 2023-03-02 | Online water flushing device of air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219531809U true CN219531809U (en) | 2023-08-15 |
Family
ID=87628519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320358318.1U Active CN219531809U (en) | 2023-03-02 | 2023-03-02 | Online water flushing device of air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219531809U (en) |
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2023
- 2023-03-02 CN CN202320358318.1U patent/CN219531809U/en active Active
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