CN112284175A - A finned inner helical tube heat exchanger for boiler - Google Patents
A finned inner helical tube heat exchanger for boiler Download PDFInfo
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- CN112284175A CN112284175A CN202011345518.0A CN202011345518A CN112284175A CN 112284175 A CN112284175 A CN 112284175A CN 202011345518 A CN202011345518 A CN 202011345518A CN 112284175 A CN112284175 A CN 112284175A
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- Prior art keywords
- heat exchange
- tube
- liquid
- heat exchanger
- exchange tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/003—Multiple wall conduits, e.g. for leak detection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
- F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
本发明公开了一种用于锅炉的翅片式内螺旋管换热器，属于换热设备技术领域，包括换热管、翅片及螺旋通道，换热管包括外壁面和内壁面，换热管的管壁外设有翅片，翅片为螺旋结构，通过缠绕固定于换热管上，换热管的外壁面和内壁面之间形成了供第一液体通过的空间，该空间的底部设有第一液体进口和顶部设有第一液体出口，换热管的管壁内设有供第二液体通过的螺旋通道，螺旋通道的顶部为第二液体进口和底部为第二液体出口，采用本发明的技术方案，能够将高温尾气的热量相比较于传统的换热器更多的利用起来，并且使高温尾气的排放温度更低，从而达到节能环保的目的，具有结构简单、加工成本低及节能环保的特点。
The invention discloses a fin-type inner spiral tube heat exchanger for boilers, belonging to the technical field of heat exchange equipment, comprising heat exchange tubes, fins and spiral channels. There are fins on the outside of the tube wall of the tube. The fins are of helical structure and are fixed on the heat exchange tube by winding. A space for the first liquid to pass through is formed between the outer wall surface and the inner wall surface of the heat exchange tube. The bottom of the space is There is a first liquid inlet and a first liquid outlet at the top, a spiral channel for the second liquid to pass through is arranged in the tube wall of the heat exchange tube, the top of the spiral channel is the second liquid inlet and the bottom is the second liquid outlet, By adopting the technical scheme of the present invention, the heat of the high-temperature exhaust gas can be utilized more than the traditional heat exchanger, and the discharge temperature of the high-temperature exhaust gas can be lower, so as to achieve the purpose of energy saving and environmental protection, and has the advantages of simple structure and high processing cost. Low energy and environmental protection features.
Description
Technical Field
The invention belongs to the technical field of heat exchange equipment, and particularly relates to a finned inner spiral tube heat exchanger for a boiler.
Background
The heat exchanger has the characteristics of firm structure, large use elasticity, strong adaptability and the like, is widely applied to the aspects of chemical industry, petroleum, electric power and the like, is miniaturized along with the special requirements of microelectronics, medical treatment, aerospace and the like, and has great improvement space in the aspects of design methods, structural forms, material parameters and the like. At the present stage, the research on the shell and tube heat exchanger is mainly started by enhancing the convection heat transfer in the tube, and the mechanism of the method is mainly that the thermal resistance is mainly concentrated on a boundary layer during heat transfer, and the key of enhancing the heat transfer is to thin or destroy the boundary layer so as to achieve the purpose of enhancing the heat transfer.
The heat loss of the discharged smoke of the coal-fired thermal power plant is the largest one of various heat losses of a power station boiler, generally 5-8%, and accounts for 80% or more of the total heat loss of the boiler. The main factor influencing the heat loss of the exhaust smoke is the temperature of the exhaust smoke of the boiler, and generally, the heat loss of the exhaust smoke is increased every time the temperature of the exhaust smoke is increased by 20 ℃. At present, the heat quantity of the high-temperature tail gas recovered by the traditional heat exchanger is limited, so that part of heat is lost, the energy is wasted, and meanwhile, the temperature of the high-temperature tail gas is too high.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a finned inner spiral tube heat exchanger for a boiler, which can utilize the heat of high-temperature tail gas more than that of the traditional heat exchanger and lower the emission temperature of the high-temperature tail gas, thereby achieving the purposes of energy conservation and environmental protection.
A spiral tube heat exchanger in fin formula for boiler, its characterized in that includes heat exchange tube, fin and helical coiled passage, the heat exchange tube includes outer wall and internal face, the pipe wall of heat exchange tube is equipped with the fin outward, the fin is helical structure, is fixed in on the heat exchange tube through the winding, the space that supplies first liquid to pass through has been formed between the outer wall of heat exchange tube and the internal face, the bottom in space is equipped with first liquid import and the top is equipped with first liquid outlet, be equipped with the helical coiled passage that supplies the second liquid to pass through in the pipe wall of heat exchange tube, helical coiled passage's top is second liquid import and bottom for second liquid outlet.
The finned inner spiral tube heat exchanger for the boiler is characterized in that the spiral channel is arranged on the outer wall surface of the heat exchange tube and fixed on the outer wall surface of the heat exchange tube through welding.
The finned inner spiral tube heat exchanger for the boiler is characterized in that the fins are fixed on the heat exchange tube through welding.
The finned inner spiral tube heat exchanger for the boiler is characterized in that the first liquid and the second liquid are media to be heated in the boiler.
Compared with the prior art, the invention has the beneficial effects that:
1) by adopting the technical scheme of the invention, the heat of the high-temperature tail gas can be more utilized compared with the traditional heat exchanger, and the emission temperature of the high-temperature tail gas is lower, thereby achieving the purposes of energy conservation and environmental protection;
2) the fins arranged in the heat exchanger enable the cooling gas to advance along the bending direction of the fins, so that the stripping angle alpha of the cooling gas moving around the body is increased to 120-140 degrees, the stripping angle is increased, the cooling gas can be better cooled to the back of the heat exchange tube, and stripping turbulence generated after the back gas flow is stripped is more concentrated, so that the heat exchange effect of the heat exchanger is improved;
3) the spiral channel provided by the invention enables two cooling liquids to be cooled and absorb heat in a convection mode, and the heat exchange effect of the two liquids and the high-temperature tail gas is better due to the arrangement of the convection mode;
4) the invention has the characteristics of simple structure, low processing cost, energy saving and environmental protection.
Drawings
FIG. 1 is a schematic external view of the present invention;
FIG. 2 is a schematic view of the angle of the present invention;
FIG. 3 is a schematic view of the spiral channel structure in the heat exchange tube of the present invention;
fig. 4 is a schematic view of the overall structure of the heat exchanger of the present invention.
In the figure: 1-heat exchange tube; 2-a fin; 3-a helical channel; 4-a first liquid inlet; 5-a first liquid outlet; 6-a second liquid inlet; 7-second liquid outlet.
Detailed Description
The invention will be further described with reference to the accompanying drawings, to which, however, the scope of the invention is not limited.
As shown in fig. 1-4, a fin type inner spiral tube heat exchanger for a boiler comprises a heat exchange tube 1, fins 2 and a spiral channel 3, wherein the heat exchange tube 1 comprises an outer wall surface and an inner wall surface, the fins 2 are arranged outside the tube wall of the heat exchange tube 1, the fins 2 are of a spiral structure, the fins 2 are fixed on the heat exchange tube 1 by winding and welding, cooling gas transversely passes through the tube surface along the heat exchange tube 1 from the outer side, because of the action of the fins 2, the cooling gas can generate violent disturbance, thereby greatly increasing the heat exchange effect, and because the fins 2 are of spiral structures and are wound on the heat exchange tube 1, the cooling gas can move forward along the bending direction of the fins 2, the stripping angle alpha of the winding movement of the cooling gas is larger, and the fluid flows through the surface of the pipe along the direction vertical to the axis of the pipe, and the winding stripping phenomenon can occur, wherein the included angle between the fluid stripping point and the direction of the incoming fluid is called as the stripping angle alpha.
When the fins 2 are not added, the stripping angle alpha is 0-80 degrees, after the fins 2 are added, the Reynolds number is increased to increase the stripping angle alpha to 120-140 degrees, once the stripping angle is increased, the cooling gas can be better cooled to the surface of the heat exchange tube 1 opposite to the cooling gas, and stripping turbulence generated after the back gas flow is stripped is more concentrated, so that the heat exchange effect of the heat exchanger is improved.
According to the finned inner spiral tube heat exchanger for the boiler, a space for first liquid to pass is formed between the inner wall surface and the outer wall surface of the heat exchange tube 1, the bottom of the space is provided with a first liquid inlet 4, the top of the space is provided with a first liquid outlet 5, and the first liquid inlet 4 is communicated with the first liquid outlet 5.
According to the fin type inner spiral tube heat exchanger for the boiler, the spiral channel 3 for a second liquid to pass through is arranged in the tube wall in the heat exchange tube 1, the top of the spiral channel 3 is provided with the second liquid inlet 6, the bottom of the spiral channel is provided with the second liquid outlet 7, and the spiral channel 3 is fixed on the outer wall surface of the heat exchange tube 1 through welding.
According to the fin type inner spiral tube heat exchanger for the boiler, the first liquid and the second liquid are working media to be heated by the boiler.
Specifically, when the high-temperature tail gas passes through the inner wall surface of the heat exchange tube 1, the second liquid to be heated flows into the spiral channel 3 through the second liquid inlet 6, the first liquid to be heated flows into the spiral channel 3 from the first liquid inlet 4, the spiral channel 3 is welded on the heat exchange tube 1, so that the first liquid can move forward along with the flat spiral channel 3 after entering, the two cooling liquids are in a convection mode for cooling and absorbing heat, the heat exchange effect of the two liquids and the high-temperature tail gas is better due to the arrangement of the convection mode, the inlet temperature of the first liquid is lower, the temperature is rapidly increased under the influence of the second liquid and the high-temperature tail gas in the tube, the heat purpose of the high-temperature tail gas is fully utilized, and the temperature of the tail gas is; meanwhile, outside the heat exchange tube 1, cooling gas flows across the tube surface along the heat exchange tube 1 from the outside, and the cooling gas generates violent disturbance due to the fins 2, and takes away redundant heat before the phase change of the cooling liquid in the tube wall, so that the highest temperature of the cooling liquid is maintained below the saturation temperature of the cooling liquid, the heat in the high-temperature tail gas is fully utilized, and the temperature of the high-temperature tail gas is further reduced.
The steam temperature from the low-pressure boiler to the high-pressure boiler is about 400-500 ℃, when the high-temperature tail gas passes through the heat exchange tube 1 of the heat exchanger, if only a single internal spiral channel 3 without the fins 2 is provided, the first cooling liquid and the second cooling liquid are easily subjected to phase change heat exchange in order to reduce the temperature of the high-temperature tail gas to be below 200 ℃, so that the cooling liquid at the outlet is changed into steam, after the cooling liquid is collected, the temperature of the cooling steam is far lower than the steam temperature in the boiler, the pressure is far lower than the pressure in the boiler, the cooling steam cannot be directly put into the boiler for continuous heating, the pressure needs to be re-pressurized, extra energy consumption is required, and the environment-friendly and energy-saving principle is not met.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011345518.0A CN112284175B (en) | 2020-11-26 | 2020-11-26 | A finned internal spiral tube heat exchanger for boilers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011345518.0A CN112284175B (en) | 2020-11-26 | 2020-11-26 | A finned internal spiral tube heat exchanger for boilers |
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| Publication Number | Publication Date |
|---|---|
| CN112284175A true CN112284175A (en) | 2021-01-29 |
| CN112284175B CN112284175B (en) | 2025-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011345518.0A Active CN112284175B (en) | 2020-11-26 | 2020-11-26 | A finned internal spiral tube heat exchanger for boilers |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2735282Y (en) * | 2004-09-15 | 2005-10-19 | 大连熵立得传热技术有限公司 | Elliptic jacket radial heat pipe exchanger |
| CN202485528U (en) * | 2012-02-23 | 2012-10-10 | 宝山钢铁股份有限公司 | Fin-shaped radial heat exchange tube |
| CN202709806U (en) * | 2012-03-14 | 2013-01-30 | 郭楚昊 | Tubular heat exchanger |
| CN213811907U (en) * | 2020-11-26 | 2021-07-27 | 浙江工业大学 | Finned inner spiral pipe heat exchanger |
-
2020
- 2020-11-26 CN CN202011345518.0A patent/CN112284175B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2735282Y (en) * | 2004-09-15 | 2005-10-19 | 大连熵立得传热技术有限公司 | Elliptic jacket radial heat pipe exchanger |
| CN202485528U (en) * | 2012-02-23 | 2012-10-10 | 宝山钢铁股份有限公司 | Fin-shaped radial heat exchange tube |
| CN202709806U (en) * | 2012-03-14 | 2013-01-30 | 郭楚昊 | Tubular heat exchanger |
| CN213811907U (en) * | 2020-11-26 | 2021-07-27 | 浙江工业大学 | Finned inner spiral pipe heat exchanger |
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| Publication number | Publication date |
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| CN112284175B (en) | 2025-03-25 |
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