CN109813143B - A heat exchanger for waste heat utilization of flue gas - Google Patents
A heat exchanger for waste heat utilization of flue gas Download PDFInfo
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- CN109813143B CN109813143B CN201910128371.0A CN201910128371A CN109813143B CN 109813143 B CN109813143 B CN 109813143B CN 201910128371 A CN201910128371 A CN 201910128371A CN 109813143 B CN109813143 B CN 109813143B
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- flue
- heat exchange
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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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Abstract
本发明涉及一种用于烟气余热利用的换热器，属于换热装置技术领域；所述换热器包括第一烟道、第二烟道、换热管、挡板和过滤板；所述挡板和过滤板均设置在所述第一烟道内，且所述挡板设置在所述过滤板下游；所述第二烟道穿透所述第一烟道，所述第二烟道设置在所述挡板下游；所述换热管穿透所述第一烟道、挡板和过滤板；采用分级换热，同时进行水/蒸汽‑原烟气换热和原烟气‑循环烟气换热，等效于传统的省煤器和空气预热器的作用，整个换热过程充分利用加压富氧燃烧锅炉产生烟气中的余热，具有结构紧凑，热利用效率高等优点。
The invention relates to a heat exchanger for utilizing the waste heat of flue gas, belonging to the technical field of heat exchange devices; the heat exchanger comprises a first flue, a second flue, a heat exchange pipe, a baffle plate and a filter plate; Both the baffle and the filter plate are arranged in the first flue, and the baffle is arranged downstream of the filter plate; the second flue penetrates the first flue, and the second flue It is arranged downstream of the baffle; the heat exchange tube penetrates the first flue, baffle and filter plate; adopts graded heat exchange, and simultaneously performs water/steam-original flue gas heat exchange and original flue gas-circulation The flue gas heat exchange is equivalent to the role of the traditional economizer and air preheater. The whole heat exchange process makes full use of the waste heat in the flue gas generated by the pressurized oxygen-enriched combustion boiler, which has the advantages of compact structure and high heat utilization efficiency.
Description
Technical Field
The invention relates to a heat exchanger for utilizing waste heat of flue gas, and belongs to the technical field of heat exchange devices.
Background
The oxygen-enriched combustion technology can collect CO generated by combustion of fossil fuel on a large scale2And has great development potential. It is characterized by that it uses the mixture of flue gas produced by combustion of fuel and pure oxygen (total oxygen content is 25-35 vol%) as combustion adjuvant instead of air. Compared with the traditional air combustion, the method has the advantages that the separation of nitrogen before combustion and the continuous flue gas circulation in the combustion process enable CO in dry flue gas2The concentration can reach more than 80 percent, and is beneficial to CO2Sealing and utilization. However, the current oxycombustion technology is performed under normal pressure, and the energy consumption generated by an air separation device, flue gas circulation and flue gas purification all cause the overall efficiency of the oxycombustion system to be reduced.
Pressurized oxyfuel combustion refers to oxyfuel combustion occurring in a pressurized vessel with a heat exchange device installed downstream of the flue gas. The method is characterized in that the method can recover the heat of the flue gas under high pressure (mainly the latent heat of water vapor is larger), and the generated high-temperature steam can be coupled to a steam circulation system, so that the power generation efficiency of the coal-fired power plant is improved. The economizer and the air heat exchanger in the traditional boiler system increase the equipment cost of the boiler system, and are used in a pressurizing system, and the structure is not compact due to the reduction of the volume of the flue gas, so that the heat transfer of the flue gas is not facilitated to be enhanced.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a heat exchanger for utilizing the waste heat of flue gas, which has a compact structure and reduces the size cost of equipment; the multi-stage heat exchange improves the heat exchange efficiency. The method is particularly suitable for a pressurized oxygen-enriched combustion system due to the full utilization of the latent heat of the water vapor in the high-temperature and high-pressure flue gas.
The invention provides a heat exchanger for utilizing waste heat of flue gas, which is characterized by comprising a first flue, a second flue, a heat exchange tube, a baffle and a filter plate, wherein the first flue is connected with the second flue; the baffle and the filter plate are both arranged in the first flue, and the baffle is arranged at the downstream of the filter plate; the second flue penetrates the first flue, the second flue being disposed downstream of the baffle; the heat exchange tube penetrates through the first flue, the baffle and the filter plate.
Further, the heat exchanger for utilizing the residual heat of the flue gas as claimed in claim 1, wherein the heat exchange tubes are arranged along the flow direction of the medium in the first flue, and the intervals between the adjacent heat exchange tubes are equal, and the intervals are 1.5 to 2.5 times of the diameters of the heat exchange tubes.
Further, the heat exchanger for utilizing the waste heat of the flue gas as claimed in claim 2, wherein the heat exchanger further comprises a water pump and a water collecting tank, the inlet end of the heat exchange tube is communicated with the water collecting tank, and the water pump is connected with the water collecting tank and supplies water to the water collecting tank.
Furthermore, the second flue is a U-shaped pipeline, the flow direction of the medium in the second flue and the flow direction of the medium in the first flue are orthogonally arranged, the second flue is positioned on the periphery of the heat exchange tube, the distance between the second flue and the heat exchange tube is 1.5-2.0 times of the diameter of the heat exchange tube, and the distance between the second flue and the first flue is 1.0-1.5 times of the maximum width of the second flue.
Furthermore, a plurality of baffles are installed on the inner wall of the first flue, the baffles are arranged in a staggered mode in the flow direction of the medium in the first flue, and the distance between the free ends of the baffles and the inner wall of the first flue is 1/3-1/2 times of the width of the first flue.
Furthermore, the baffle is perpendicular to the direction of the medium flow in the first flue, and the baffle is detachably mounted on the inner wall of the first flue.
Further, the filter plate is disposed near an inlet of the first flue.
Furthermore, the filter plate is detachably connected to the inner wall of the first flue, and solid particles with large particle sizes in the filtered flue gas are filtered.
Furthermore, a plurality of holes are formed in the filter plate, and the distance between the filter plate and the baffle plate is 1.0-1.5 times of the distance between the adjacent baffle plates.
Furthermore, the baffle and the filter plate are made of high temperature and high heat resistance and ash deposition and slag bonding resistance materials.
Furthermore, the outlet of the heat exchange tube is provided with a steam outlet structure for collecting and discharging steam, and the steam outlet structure is a contraction section pipeline, so that the steam can flow conveniently.
Compared with the prior art, the invention has the following advantages:
1. the heat exchanger adopts graded heat exchange, firstly utilizes the heat exchange tube arranged in the first flue to exchange heat between water and flue gas, secondly utilizes the second flue arranged in the first flue to exchange heat between raw flue gas and clean flue gas, is equivalent to the action of a traditional economizer and an air preheater, and fully utilizes the waste heat in the flue gas generated by the pressurized oxygen-enriched combustion boiler in the whole heat exchange process due to the adoption of the integrated design of the raw flue gas-steam-clean flue gas heat exchange, and has compact structure and high heat utilization efficiency.
2. According to the invention, the heat exchange tubes are arranged in a countercurrent manner along the medium flow direction in the first flue, and the adjacent heat exchange tubes are arranged at equal intervals, so that the heat transfer between the original flue gas and the heat tubes is enhanced, and the heat exchange efficiency is higher.
3. According to the invention, the second flue is a U-shaped pipeline, the flow direction of the medium in the second flue and the flow direction of the medium in the first flue are orthogonally arranged, and the second flue is positioned at the periphery of the heat exchange pipe, so that the contact area between the second flue and the flue gas is increased, and the waste heat utilization of the flue gas is facilitated.
4. The baffles which are arranged in a staggered mode can slow down the flow speed of the flue gas, prolong the contact time of the flue gas and the heat exchange tube and improve the heat exchange efficiency.
5. According to the invention, the filter plate and the baffle plate are detachably mounted, and the material with high temperature and pressure resistance and dust and slag deposition resistance is adopted, so that dust and slag deposition is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
wherein: 1. the heat exchange tube is arranged at the bottom of the water tank, the water pump is arranged at the top of the water tank, the water tank is arranged at the bottom of the water tank, the heat exchange tube is;
FIG. 2 is a schematic view of the cross-sectional structure A-A in FIG. 1;
wherein: 41. second stack inlet, 42, second stack outlet.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1
As shown in fig. 1, the present embodiment provides a heat exchanger for utilizing flue gas waste heat, which includes a first flue 9, a second flue 4, a heat exchange tube 3, a baffle 5 and a filter plate 6;
specifically, the first flue is provided with: the first flue 9 is vertically arranged, the first flue inlet 7 is arranged at the upper part of one side, and the first flue outlet 10 is arranged at the lower part of the other side; the first flues 9 may be rectangular parallelepiped or cylindrical or similar regular long cylindrical shapes.
The baffle 5 and the filter plate 6 are both fixedly connected in the first flue 9, and the baffle 5 is arranged at the downstream of the filter plate 6; the second chimney 4 penetrates the first chimney 9, the second chimney 4 is arranged at the downstream of the baffle 5; the heat exchange tube 3 penetrates through the first flue 9, the baffle 5 and the filter 6, smoke enters the first flue 9, particles are filtered out through the filter 6 at first, then the smoke passes through the baffle 5, and heat exchange is carried out between the baffle 5 and the heat exchange tube 3 when the smoke flows.
Specifically, as shown in fig. 2, the heat exchange pipe 3 is provided with: 16 heat exchange tubes are distributed in a rectangular array.
In order to improve the heat exchange efficiency between the medium in the heat exchange tube 3 and the flue gas in the first flue 9 and increase the contact area, in this embodiment, the heat exchange tube 3 is arranged in a countercurrent manner along the medium flow direction in the first flue 9, and the adjacent heat exchange tubes are arranged at equal intervals.
As a generator of steam in the heat exchange tube 3, the heat exchanger 3 of the embodiment further comprises a water pump 1 and a water collection tank 2, the inlet end of the heat exchange tube 3 is communicated with the water collection tank 2, the water pump 1 is connected with the water collection tank 2 to supply water for the water collection tank 2, the supplied water enters the heat exchange tube 3 from the water collection tank 2, and high-temperature steam is generated after heat exchange.
As shown in fig. 2, a medium in the first flue 9 is raw flue gas, a medium in the second flue 4 is clean flue gas, and in order to make heat exchange efficiency between the raw flue gas and the clean flue gas high, specifically, the second flue 4 is a U-shaped pipe, a medium flow direction in the second flue 4 and the first flue 9 is orthogonally arranged, the second flue 4 is located at the periphery of the heat exchange pipe 3, a distance between the second flue 4 and the heat exchange pipe 3 is 1.5-2.0 times of a diameter of the heat exchange pipe 3, and a distance between the second flue 4 and the first flue 9 is 1.0-1.5 times of a maximum width of the second flue 4.
Specifically, the baffle 5 is provided: 5 baffles are installed on the inner wall of the first flue 9, the baffles 5 are arranged in a staggered mode in the flow direction of the medium in the first flue 9, and the distance between the free ends of the baffles 5 and the inner wall of the first flue 9 is larger than 1/3-1/2 of the width of the first flue 9; and the baffle 5 is perpendicular to the flowing direction of the medium in the first flue 9.
In order to facilitate the flow of steam, a steam outlet structure for collecting and discharging steam is arranged at the outlet of the heat exchange tube 3, and the steam outlet structure is a contraction section pipeline.
Specifically, the filter plate is configured to: the filter plate 6 is provided with a plurality of holes, and the distance between the filter plate 6 and the baffle 5 is 1.0-1.5 times of the distance between adjacent baffles.
Specifically, the baffle 5 and the filter plate 6 are made of high temperature and high heat resistance and ash deposition and slag bonding resistance materials.
Example 2
As shown in fig. 1, the present embodiment provides a heat exchanger for utilizing waste heat of flue gas.
On the basis of the embodiment 1, the connection mode of the baffle 5 and the filter plate 6 is improved.
Specifically, another arrangement of the baffle 5 is as follows: the baffle 5 is detachably arranged on the inner wall of the first flue.
Specifically, another arrangement of the filter plate 6 is: the filter plate 6 is detachably arranged close to the inlet of the first flue. Solid particles with large particle sizes in the smoke are filtered.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910128371.0A CN109813143B (en) | 2019-02-21 | 2019-02-21 | A heat exchanger for waste heat utilization of flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910128371.0A CN109813143B (en) | 2019-02-21 | 2019-02-21 | A heat exchanger for waste heat utilization of flue gas |
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| Publication Number | Publication Date |
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| CN109813143A CN109813143A (en) | 2019-05-28 |
| CN109813143B true CN109813143B (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910128371.0A Active CN109813143B (en) | 2019-02-21 | 2019-02-21 | A heat exchanger for waste heat utilization of flue gas |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112128737A (en) * | 2019-08-30 | 2020-12-25 | 韩保刚 | Energy-saving flue gas waste heat recovery pipeline and method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2199431Y (en) * | 1994-07-25 | 1995-05-31 | 陈晋文 | Flue waste-heat energy-saver |
| CN2438927Y (en) * | 2000-09-25 | 2001-07-11 | 中日青年交流中心 | Flue heat exchanger |
| CN201190988Y (en) * | 2008-04-11 | 2009-02-04 | 马广来 | Convection heat economizer |
| CN202547448U (en) * | 2012-04-28 | 2012-11-21 | 江苏巴威工程技术股份有限公司 | Heat exchanger for smoke waste heat recovery |
| CN204176628U (en) * | 2014-11-02 | 2015-02-25 | 魏星 | A kind of air preheater and economizer integrated apparatus |
| CN104833243A (en) * | 2015-05-08 | 2015-08-12 | 杭州佰强能源科技有限公司 | Plastic heat exchanger for recovering waste heat of low-temperature smoke |
| CN205909324U (en) * | 2016-06-28 | 2017-01-25 | 哈尔滨市金京锅炉有限公司 | Boiler high temperature smoke treatment device |
| CN106524791A (en) * | 2016-12-22 | 2017-03-22 | 中国科学院广州能源研究所 | Three-dimensional variable-space variable-structure flue gas reheater |
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- 2019-02-21 CN CN201910128371.0A patent/CN109813143B/en active Active
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