CN210070697U - Reheating type flue gas contact heat exchanger - Google Patents
Reheating type flue gas contact heat exchanger Download PDFInfo
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- CN210070697U CN210070697U CN201920665080.0U CN201920665080U CN210070697U CN 210070697 U CN210070697 U CN 210070697U CN 201920665080 U CN201920665080 U CN 201920665080U CN 210070697 U CN210070697 U CN 210070697U
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Abstract
The utility model discloses a reheating type flue gas contact heat exchanger, which relates to the technical field of flue gas waste heat recovery, and comprises a demister, a flue gas inlet, a liquid distributor, a water tray, a circulating water outlet, a filler and a circulating water inlet, the flue gas heat exchange tube, the exhanst gas outlet, baffle and casing, the water tray, the filler, the liquid distributor, baffle and defroster set gradually in the casing from bottom to top, the flue gas entry sets up on the casing lateral wall and is located between baffle and the liquid distributor, the baffle is used for preventing the flue gas to get into the casing after upwards flowing, the exhanst gas outlet sets up at the casing top, a plurality of flue gas heat exchange tube is arranged in the casing, the baffle is passed to the upper end of each flue gas heat exchange tube, the lower extreme of each flue gas heat exchange tube passes the filler, the flue gas heat exchange tube is located the defroster below, the circulating water export sets up in casing side bottom, the circulating. The utility model provides a reheat type flue gas contact heat exchanger can realize the effect that the flue gas disappears when flue gas waste heat recovery.
Description
Technical Field
The utility model relates to a flue gas waste heat recovery technical field especially relates to a reheat type flue gas contact heat exchanger.
Background
In order to fully exploit the energy-saving potential of clean heat supply and deeply recover the low-temperature waste heat of the fuel gas flue gas, the popularization and the application of the absorption heat pump flue gas waste heat recovery system are gradually developed in China since 2014, and remarkable effects are obtained. Wherein, a device for carrying out degree of depth heat transfer with the flue gas adopts flue gas contact heat exchanger more, can reduce the gas temperature to 30 ℃. The flue gas contact type heat exchanger is divided into two types, namely a type with filler and a type without filler.
As shown in fig. 1, a contact heat exchanger with packing generally comprises a shell, a liquid distributor, packing, a demister and a water tray, and has a basic principle that circulating water is uniformly distributed on the packing through the liquid distributor to form a liquid film, flue gas flows from bottom to top, and the flue gas and water finish a main heat exchange process in the packing.
The non-filler contact heat exchanger generally comprises a shell, a nozzle, a demister and a water tray, and has the basic principle that circulating water flows from top to bottom after being atomized by a plurality of layers of nozzles, smoke flows from bottom to top, and the smoke and water finish the main heat exchange process in a tall space.
Along with the popularization and application of the heat pump flue gas waste heat recovery system, the market has higher and higher requirements on waste heat recovery, and not only can energy be saved and consumption be reduced, but also a new requirement for eliminating 'white smoke' is provided. However, under the influence of the aspects of investment economy, parameter rationality and the like, the design exhaust gas temperature of the existing heat pump flue gas waste heat recovery system is 30 ℃, the exhaust gas temperature is in an extremely cold period, when the outdoor temperature is below 0 ℃, the steam of the flue gas is rapidly condensed after the flue gas is cooled, the condensation speed is higher than the diffusion speed, and obvious white smoke can still be seen.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reheat type flue gas contact heat exchanger to solve the problem that above-mentioned prior art exists, realize the flue gas effect of disappearing white when flue gas waste heat recovery.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a reheating type flue gas contact heat exchanger, which comprises a demister, a flue gas inlet, a liquid distributor, a water tray, a circulating water outlet, a filler, a circulating water inlet, a flue gas heat exchange tube, a baffle and a shell, wherein the water tray, the filler, the liquid distributor, the baffle and the demister are sequentially arranged in the shell from bottom to top, the flue gas inlet is arranged on the side wall of the shell and is positioned between the baffle and the liquid distributor, the baffle is used for preventing flue gas from flowing upwards after entering the shell, the flue gas outlet is arranged at the top of the shell, a plurality of flue gas heat exchange tubes are arranged in the shell, the upper end of each flue gas heat exchange tube passes through the baffle, the lower end of each flue gas heat exchange tube passes through the filler, the flue gas heat exchange tube is positioned below the demister, the circulating water outlet is arranged at the bottom of the side, the circulating water inlet is arranged on the side wall of the shell and is connected with the liquid distributor.
Preferably, the flue gas heat exchange tubes are uniformly arranged, and the total sectional area of the flue gas heat exchange tubes in the shell is equal to the total sectional area outside the flue gas heat exchange tubes in the shell.
Preferably, the flue gas heat exchange tube is in extrusion contact with the filler.
Preferably, the length of the lower end of the flue gas heat exchange tube penetrating out of the filler is 10-20 mm.
Preferably, the flue gas heat exchange tube is a stainless steel tube.
Preferably, the smoke inlet device further comprises a booster fan, a smoke inlet pipe is fixedly connected to the outer side of the smoke inlet, and the booster fan is arranged on the smoke inlet pipe.
Preferably, the filler is stainless steel filler and is fixed in the shell.
Preferably, the packing is structured packing.
The utility model discloses for prior art gain following technological effect:
the utility model provides a reheat type flue gas contact heat exchanger, high temperature flue gas enter the casing from the flue gas entry, flow from top to bottom in the casing, carry out the heat transfer with the flue gas in the flue gas heat exchange tube, then get into the filler, in the filler, the liquid distributor evenly spreads the circulating water on the filler and forms the liquid film, flue gas and circulating water liquid film heat transfer, the vapor condensation in the flue gas; the flue gas penetrates out of the filler and then enters the space above the water tray, then enters the flue gas heat exchange tube, the flue gas in the flue gas heat exchange tube is heated by high-temperature flue gas outside the tube to form reheated flue gas, then the reheated flue gas is discharged from an outlet at the upper part of the flue gas heat exchange tube, and the reheated flue gas is demisted by a demister and then discharged to the atmosphere; the utility model discloses utilize the flue gas waste heat to realize the flue gas reheat, do not consume extra heat source, do not increase the system energy consumption, the flue gas has increased the suction after reheating, plays certain offset effect to the resistance that the flue gas double-flow increases, and flue gas condensation is after reheating, effectively reduces the condensing rate of vapor, and vapor diffusion velocity is greater than condensing rate, can realize that the flue gas disappears white effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a contact heat exchanger with packing according to the prior art;
fig. 2 is a schematic structural view of the reheating type flue gas contact heat exchanger of the present invention;
fig. 3 is a schematic view of the flow direction of flue gas and circulating water of the reheating type flue gas contact heat exchanger of the present invention;
in the figure: 1-demister, 2-flue gas inlet, 3-liquid distributor, 4-water tray, 5-circulating water outlet, 6-filler, 7-circulating water inlet, 8-flue gas heat exchange tube, 9-flue gas outlet, 10-baffle and 11-shell.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a reheat type flue gas contact heat exchanger to solve the problem that prior art exists, realize the flue gas effect of disappearing white when flue gas waste heat recovery.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 2 to 3, this embodiment provides a reheating-type flue gas contact heat exchanger, which includes a demister 1, a flue gas inlet 2, a liquid distributor 3, a water tray 4, a circulating water outlet 5, a filler 6, a circulating water inlet 7, flue gas heat exchange tubes 8, a flue gas outlet 9, a baffle 10 and a casing 11, wherein the water tray 4, the filler 6, the liquid distributor 3, the baffle 10 and the demister 1 are sequentially arranged in the casing 11 from bottom to top, the flue gas inlet 2 is arranged on a side wall of the casing 11 and located between the baffle 10 and the liquid distributor 3, the baffle 10 is used for preventing flue gas from entering the casing 11 and flowing upwards, the flue gas outlet 9 is arranged at the top of the casing 11, a plurality of flue gas heat exchange tubes 8 are arranged in the casing 11, the upper end of each flue gas heat exchange tube 8 penetrates through the baffle 10, the lower end of each flue gas heat exchange tube 8 penetrates through the filler 6, the, the circulating water inlet 7 is arranged on the side wall of the shell 11 and is connected with the liquid distributor 3.
High-temperature flue gas enters from the flue gas inlet 2, flows downwards from top to bottom in the shell 11, and exchanges heat with flue gas in the flue gas heat exchange tube 8 for the first time, the high-temperature flue gas is cooled to medium-temperature flue gas, the medium-temperature flue gas enters the filler 6, in the filler 6, the liquid distributor 3 uniformly distributes circulating water on the filler 6 to form a liquid film, the medium-temperature flue gas exchanges heat with the circulating water liquid film, water vapor in the medium-temperature flue gas is condensed, and the medium-temperature flue gas is cooled to low-temperature flue gas; the low-temperature flue gas penetrates out of the filler 6 and then enters the space above the water tray 4, then enters the flue gas heat exchange tube 8, the low-temperature flue gas is heated by the high-temperature flue gas outside the tube in the flue gas heat exchange tube 8 to form reheated flue gas, then the reheated flue gas is discharged from an outlet at the upper part of the flue gas heat exchange tube 8, and the reheated flue gas is demisted by the demister 1 and then discharged to the atmosphere; the reheating type flue gas contact heat exchanger in the embodiment utilizes flue gas waste heat to realize flue gas reheating, does not consume an extra heat source, does not increase system energy consumption, increases draft after flue gas reheating, plays certain offset effect to the resistance that the two journey of flue gas increases, flue gas condensation reheating back, effectively reduces the condensation speed of vapor, and vapor diffusion velocity is greater than condensation speed, can realize the effect that the flue gas disappears to be white.
The flue gas heat exchange tubes 8 are uniformly arranged, the total sectional area of the flue gas heat exchange tubes 8 in the shell 11 is equal to the total sectional area outside the flue gas heat exchange tubes 8 in the shell 11, and the flue gas heat exchange tubes 8 are arranged in the above manner, so that the heat exchange of the inner flue gas and the outer flue gas of the flue gas heat exchange tubes 8 is more uniform, and the heat exchange effect is better.
The flue gas heat exchange tube 8 is in extrusion contact with the filler 6, so that the flue gas can exchange heat through the filler 6.
The length that 8 lower extremes of flue gas heat exchange tube worn out filler 6 is 10 ~ 20mm for the flue gas is from the 6 back that flow out of filler, and inflow flue gas heat exchange tube 8 that can be more swift carries out the heat transfer, improves flue gas heat exchange efficiency.
The flue gas heat exchange tube 8 is the stainless steel pipe, adopts the stainless steel pipe as flue gas heat exchange tube 8, and the heat transfer is effectual, durable.
The packing 6 is stainless steel packing and is fixed in the shell 11, and the packing 6 is made of stainless steel, so that the heat exchange effect is good and the durability is high.
The packing 6 is structured packing, and the heat exchange efficiency is improved by arranging the packing 6 as the structured packing.
Example two
The embodiment provides a reheat type flue gas contact heat exchanger, with the difference of reheat type flue gas contact heat exchanger in the embodiment one, still include booster fan, 2 outside fixedly connected with of flue gas entry advance the tobacco pipe, advance and be provided with booster fan on the tobacco pipe, through booster fan's setting, increase flue gas gets into the pressure of flue gas entry 2, promotes the flue gas and flows in casing 11, has improved the efficiency of heat transfer.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. The utility model provides a reheat type flue gas contact heat exchanger which characterized in that: comprises a demister, a flue gas inlet, a liquid distributor, a water tray, a circulating water outlet, a filler, a circulating water inlet, a flue gas heat exchange pipe, a flue gas outlet, a baffle and a shell, the water tray, the filler, the liquid distributor, the baffle and the demister are sequentially arranged in the shell from bottom to top, the flue gas inlet is arranged on the side wall of the shell and is positioned between the baffle and the liquid distributor, the baffle is used for preventing flue gas from flowing upwards after entering the shell, the flue gas outlet is arranged at the top of the shell, a plurality of flue gas heat exchange tubes are arranged in the shell, the upper end of each flue gas heat exchange tube penetrates through the baffle, the lower end of each flue gas heat exchange tube penetrates through the filler, the flue gas heat exchange tube is located below the demister, the circulating water outlet is formed in the bottom of the side face of the shell, and the circulating water inlet is formed in the side wall of the shell and connected with the liquid distributor.
2. The reheat type flue gas contact heat exchanger of claim 1, wherein: the smoke heat exchange tubes are uniformly arranged, and the total sectional area of the smoke heat exchange tubes in the shell is equal to the total sectional area of the smoke heat exchange tubes in the shell.
3. The reheat type flue gas contact heat exchanger of claim 1, wherein: the flue gas heat exchange tube is in extrusion contact with the filler.
4. The reheat type flue gas contact heat exchanger of claim 1, wherein: the length of the lower end of the flue gas heat exchange tube penetrating out of the filler is 10-20 mm.
5. The reheat type flue gas contact heat exchanger of claim 1, wherein: the flue gas heat exchange tube is a stainless steel tube.
6. The reheat type flue gas contact heat exchanger of claim 1, wherein: still include booster fan, flue gas entry outside fixedly connected with advances the tobacco pipe, it is provided with on the tobacco pipe to advance booster fan.
7. The reheat type flue gas contact heat exchanger of claim 1, wherein: the filler is stainless steel filler and is fixed in the shell.
8. The reheat type flue gas contact heat exchanger of claim 1 or 7, wherein: the packing is structured packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920665080.0U CN210070697U (en) | 2019-05-10 | 2019-05-10 | Reheating type flue gas contact heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920665080.0U CN210070697U (en) | 2019-05-10 | 2019-05-10 | Reheating type flue gas contact heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210070697U true CN210070697U (en) | 2020-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920665080.0U Active CN210070697U (en) | 2019-05-10 | 2019-05-10 | Reheating type flue gas contact heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210070697U (en) |
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2019
- 2019-05-10 CN CN201920665080.0U patent/CN210070697U/en active Active
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