CN220206443U - Double-film anti-corrosion heat exchange equipment - Google Patents
Double-film anti-corrosion heat exchange equipment Download PDFInfo
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- CN220206443U CN220206443U CN202320087647.7U CN202320087647U CN220206443U CN 220206443 U CN220206443 U CN 220206443U CN 202320087647 U CN202320087647 U CN 202320087647U CN 220206443 U CN220206443 U CN 220206443U
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- corrosion
- heat exchange
- film
- double
- cooling water
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- 238000005260 corrosion Methods 0.000 title claims abstract description 67
- 230000007797 corrosion Effects 0.000 claims abstract description 28
- 229920002313 fluoropolymer Polymers 0.000 claims abstract description 26
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 10
- 239000010963 304 stainless steel Substances 0.000 claims description 9
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 3
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 abstract description 5
- 239000000460 chlorine Substances 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000005536 corrosion prevention Methods 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 19
- 239000003546 flue gas Substances 0.000 description 19
- 229910001220 stainless steel Inorganic materials 0.000 description 9
- 239000010935 stainless steel Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000002956 ash Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model discloses a double-film anti-corrosion heat exchange device, which comprises an inlet header provided with a cooling water inlet hole and an outlet header provided with a cooling water outlet hole, wherein a plurality of double-film anti-corrosion heat exchange tubes, one ends of which are connected with the inlet header and the other ends of which are connected with the outlet header, are arranged between the outlet header and the inlet header, each double-film anti-corrosion heat exchange tube consists of a plurality of base tubes which are arranged in parallel and a serpentine joint which is connected between two adjacent base tubes in series, an inorganic anti-corrosion coating is arranged outside each base tube, and a fluoroplastic film layer is arranged outside each inorganic anti-corrosion coating. The heat exchange equipment has the characteristics of low-temperature corrosion and chlorine corrosion prevention, compact film covering, difficult shaking deformation, easy cleaning of accumulated ash, low cost and small thermal resistance, and has perfect overall function and strong practicability.
Description
Technical Field
The utility model relates to the technical field of heat exchange equipment, in particular to double-film anti-corrosion heat exchange equipment.
Background
The waste heat of the flue gas is a low-grade energy which accounts for about 4-8% of the heat of the fuel; is discharged into the atmosphere because of its difficulty in use, creating a great waste. The temperature at which water vapor begins to condense in the flue gas is referred to as the water dew point, which is typically 45-54 ℃ for solid fuel fired flue gas. When the flue gas waste heat is recycled, the pipe wall temperature is often lower than the dew point of water. At this time, the water vapor in the flue gas and the sulfuric acid vapor start to form condensation, and the condensed water film can combine with SO2 and HCl in the flue gas to form an acidic solution. The low-temperature corrosion is most serious when the wall temperature is near the dew point of water, so that the flue gas waste heat exchanger is often corroded to pass through a pipe in a short time, equipment is damaged, and the furnace is forced to be stopped.
In order to enable the flue gas waste heat recovery heat exchange equipment to stably operate for a long time, a 2205 stainless steel tube heat exchanger, a fluoroplastic tube heat exchanger and a fluoroplastic film steel tube heat exchanger can be used. Compared with the 304 stainless steel material, the 2205 stainless steel material has improved corrosion resistance, but still cannot resist the strong corrosion of low-temperature flue gas condensation solution, and corrosion pipe penetration can occur in a shorter time. The fluorine plastic pipe has extremely strong corrosion resistance, but has poor rigidity, is easy to shake and deform, and threatens the safe operation of the heat exchanger. Meanwhile, compared with stainless steel materials, the heat conductivity coefficient of the fluoroplastic has an order-of-magnitude difference, so that the heat resistance of the fluoroplastic pipe heat exchanger is larger, and the heat exchange efficiency of the heat exchanger is reduced. And 2205 stainless steel is covered with fluoroplastic to form a fluoroplastic film, so that the heat exchange surface has better corrosion capability, and the rigidity of the heat exchange tube is increased. Therefore, the fluoroplastic coated steel tube heat exchanger solves the problem of low-temperature corrosion. However, the compactness of the fluoroplastic film is insufficient, and chloride ions can permeate to the surface of the inner-layer stainless steel through molecular gaps, so that chlorine corrosion is caused to the heat exchange tube. After a certain period of operation, pitting corrosion occurs on the surface of the fluoroplastic coated steel pipe, and serious oxidation corrosion is caused on the integral heat exchange pipe after the surface passivation protection film is damaged, so that a pipe penetrating accident finally occurs.
In summary, the present flue gas waste heat recovery heat exchange device has technical defects of different degrees, and mainly comprises: 2205 stainless steel tube heat exchanger has poor corrosion resistance, fluoroplastic tube heat exchanger is easy to shake and deform and has larger thermal resistance, fluoroplastic film steel tube heat exchanger can not prevent chlorine corrosion caused by penetration of chloride ions, and meanwhile, the production cost of the fluoroplastic film steel tube heat exchanger is higher.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide the low-temperature flue gas heat exchange equipment which has the characteristics of low-temperature corrosion and chlorine corrosion prevention, compact film coating, difficult shaking deformation, easy cleaning of deposited ash, low cost, small thermal resistance and the like.
In order to solve the technical problems, the aim of the utility model is realized as follows: the utility model relates to double-film anti-corrosion heat exchange equipment, which comprises an inlet header provided with a cooling water inlet hole and an outlet header provided with a cooling water outlet hole, wherein a plurality of double-film anti-corrosion heat exchange pipes, one ends of which are connected with the inlet header and the other ends of which are connected with the outlet header, are arranged between the outlet header and the inlet header, each double-film anti-corrosion heat exchange pipe consists of a plurality of base pipes which are arranged in parallel and a serpentine joint which is connected between two adjacent base pipes in series, an inorganic anti-corrosion coating is arranged outside each base pipe, and a fluoroplastic film layer is arranged outside each inorganic anti-corrosion coating.
The utility model is further provided with: the snakelike joint is coated with heat preservation cotton.
The utility model is further provided with: and a sand blasting layer arranged on the base pipe is arranged between the inorganic anti-corrosion coating and the base pipe.
The utility model is further provided with: the cooling water inlet hole and the cooling water outlet hole are both circular.
The utility model is further provided with: the thickness of the inorganic anti-corrosion coating is 0.3mm.
The utility model is further provided with: the thickness of the fluoroplastic film layer is 0.3mm.
The utility model is further provided with: the base pipe is made of 304 stainless steel material.
In summary, the utility model has the following beneficial effects:
1. the scheme adopts the 304 stainless steel base pipe, avoids the consumption of expensive stainless steel materials, and reduces the cost of the low-temperature flue gas heat exchanger.
2. The scheme adopts a compact inorganic anti-corrosion coating, and effectively prevents the penetration corrosion of chloride ions.
3. The fluoroplastic film layer with a thinner thickness is used in the scheme, so that the heat resistance of the heat exchange tube is greatly increased, and meanwhile, the surface of the heat exchange tube has good low-temperature corrosion resistance.
4. The fluoroplastic film layer used in the scheme has poor surface wettability, weak adhesion with deposited ash and easy cleaning of the deposited ash layer.
5. The scheme uses stainless steel material as the base pipe, has stronger rigidity, and is not easy to shake and deform.
Drawings
FIG. 1 is a schematic view of the overall structure of the present utility model;
fig. 2 is a schematic cross-sectional view of A-A in fig. 1.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present utility model, preferred embodiments of the present utility model will be described below with reference to specific examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present utility model, and are not limiting the patent claims of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model will be further described with reference to the drawings and preferred embodiments.
Example 1
Referring to fig. 1 and 2, the dual-film anti-corrosion heat exchange device according to the embodiment comprises an inlet header 2 provided with a cooling water inlet hole 3, an outlet header 4 provided with a cooling water outlet hole 5, a plurality of dual-film anti-corrosion heat exchange tubes 1, one ends of which are connected with the inlet header and the other ends of which are connected with the outlet header, are arranged between the outlet header 4 and the inlet header 2, the dual-film anti-corrosion heat exchange tubes 1 are composed of a plurality of base tubes 7 which are arranged in parallel and serpentine joints 6 which are connected between two adjacent base tubes 7 in series, an inorganic anti-corrosion coating 8 is arranged outside the base tubes 7, and a fluoroplastic film layer 9 is arranged outside the inorganic anti-corrosion coating 8.
Further, the serpentine joint 6 is covered with insulation cotton (not shown in the figure).
Further, a sand blasting layer arranged on the base pipe is arranged between the inorganic anti-corrosion coating 8 and the base pipe 7.
Further, the cooling water inlet hole 3 and the cooling water outlet hole 5 are both circular.
Further, the thickness of the inorganic anticorrosive coating 8 is 0.3mm.
Further, the thickness of the fluoroplastic film layer 9 is 0.3mm.
Further, the base pipe 7 is made of 304 stainless steel material.
In this embodiment, the double-film anti-corrosion heat exchange device comprises a double-film anti-corrosion heat exchange tube 1, an inlet header 2, a cooling water inlet hole 3, an outlet header 4, a cooling water outlet hole 5 and a serpentine joint 6. During operation, cooling water flows in from the circular water inlet hole below the inlet header. Then uniformly dividing into a plurality of waterways, entering the parallel double-film anti-corrosion heat exchange tube 1, and realizing the flow direction conversion through the serpentine joint 6, so that the alternate cooling water forms serpentine flow. The flue gas vertically flows through the outer side of the double-film anti-corrosion heat exchange tube 1 and flows in countercurrent with cooling water. At this time, the flue gas exchanges heat with the cooling water by a partition wall, and the cooling water after absorbing heat is collected in the outlet header 4 and flows out from the cooling water outlet hole 5 above.
According to the double-film anti-corrosion heat exchange tube 1, 304 stainless steel is used as a base tube 7, a compact inorganic anti-corrosion coating 8 is sprayed on the base tube as an inner film, and a fluoroplastic film 9 is covered outside the inorganic anti-corrosion coating 8 through an injection molding process to form an outer film. First, the fluoroplastic film 9 can effectively prevent the corrosion of the heat exchange tube by the sulfuric acid solution formed by condensing the low-temperature flue gas. However, fluoroplastic films have a large molecular spacing and are not dense enough, resulting in chloride ions being able to penetrate into the inorganic corrosion protection coating 8. At this time, if the inorganic anticorrosive coating 8, 304 stainless steel base pipe will bear chlorine corrosion, and the surface passivation protective film is destroyed, so that serious oxidation corrosion is caused to the whole heat exchange pipe, and finally pipe penetrating accidents occur. After the inorganic anti-corrosion coating 8 is sprayed, the corrosion of chloride ions to the 304 stainless steel base pipe is effectively prevented. The surface wettability of the outer fluoroplastic film is poor, the adhesion between deposited ash and the heat exchange tube is weak, and ash removal is simple. The inorganic anticorrosive paint has high heat conductivity, and the fluoroplastic film has relatively thin thickness, so that the heat exchange pipe has relatively small heat resistance increment and excellent heat exchange performance. The main body of the double-film anti-corrosion heat exchange device is of a stainless steel structure, so that the double-film anti-corrosion heat exchange device has good rigidity and is not easy to vibrate and deform due to flushing of smoke in the operation process. Under the protection of the inner membrane and the outer membrane, the base pipe material is selected to be 304 stainless steel material with lower price, and the production cost of the low-temperature flue gas heat exchange equipment is obviously reduced.
In view of the working characteristics of the double-film corrosion-resistant heat exchange equipment, the device is widely applicable to biomass flue gas with high fly ash content and sludge mixed combustion flue gas with high moisture and sulfur content besides coal-fired flue gas.
Unless specifically stated otherwise, in the present utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional or positional relation is based on the actually shown positional or positional relation, it is merely for convenience of describing the present utility model and simplifying the description, and it is not necessary to indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional or positional relation in the present utility model are merely for exemplary illustration and are not to be construed as limitations of the present patent, and it is possible for those skilled in the art to combine the embodiments and understand the specific meaning of the above terms according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (7)
1. The utility model provides a double-film anti-corrosion heat exchange device, includes the import collection case that is provided with the cooling water inlet, is provided with the export collection case of cooling water apopore, export collection case with be equipped with a plurality of one ends between the import collection case and connect the anti-corrosion heat exchange tube of double-film of import collection case, export collection case, its characterized in that: the double-film anti-corrosion heat exchange tube consists of a plurality of base tubes which are arranged in parallel and a snake-shaped joint which is connected between two adjacent base tubes in series, wherein an inorganic anti-corrosion coating is arranged outside the base tubes, and a fluoroplastic film layer is arranged outside the inorganic anti-corrosion coating.
2. The dual-membrane corrosion-resistant heat exchange apparatus of claim 1, wherein: the snakelike joint is coated with heat preservation cotton.
3. The double-film corrosion-resistant heat exchange device according to claim 1 or 2, wherein: and a sand blasting layer arranged on the base pipe is arranged between the inorganic anti-corrosion coating and the base pipe.
4. A dual-membrane corrosion-resistant heat exchange apparatus as set forth in claim 3, wherein: the cooling water inlet hole and the cooling water outlet hole are both circular.
5. The dual-membrane corrosion-resistant heat exchange apparatus of claim 1, wherein: the thickness of the inorganic anti-corrosion coating is 0.3mm.
6. The dual-membrane corrosion-resistant heat exchange apparatus of claim 1, wherein: the thickness of the fluoroplastic film layer is 0.3mm.
7. The dual-membrane corrosion-resistant heat exchange apparatus of claim 1, wherein: the base pipe is made of 304 stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320087647.7U CN220206443U (en) | 2023-01-30 | 2023-01-30 | Double-film anti-corrosion heat exchange equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320087647.7U CN220206443U (en) | 2023-01-30 | 2023-01-30 | Double-film anti-corrosion heat exchange equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220206443U true CN220206443U (en) | 2023-12-19 |
Family
ID=89141653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320087647.7U Active CN220206443U (en) | 2023-01-30 | 2023-01-30 | Double-film anti-corrosion heat exchange equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220206443U (en) |
-
2023
- 2023-01-30 CN CN202320087647.7U patent/CN220206443U/en active Active
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