CN201387022Y - Cold air intermediate bypass low temperature corrosion resistant air preheater - Google Patents
Cold air intermediate bypass low temperature corrosion resistant air preheater Download PDFInfo
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- CN201387022Y CN201387022Y CN200920011108U CN200920011108U CN201387022Y CN 201387022 Y CN201387022 Y CN 201387022Y CN 200920011108 U CN200920011108 U CN 200920011108U CN 200920011108 U CN200920011108 U CN 200920011108U CN 201387022 Y CN201387022 Y CN 201387022Y
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- 238000005260 corrosion Methods 0.000 title claims abstract description 17
- 230000007797 corrosion Effects 0.000 title claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003546 flue gas Substances 0.000 claims abstract description 29
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 abstract description 4
- 230000008020 evaporation Effects 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air Supply (AREA)
Abstract
一种冷风中间旁通抗低温腐蚀空气预热器，它主要是在现有空气预热器的空气风道外侧设一根冷风旁通管，其上端与上部风道相连通，下端设在空气入口管的入口处；在上述旁通管上设有调节阀门。本实用新型采取了部分冷风旁通，减少了低温段预热器的空气量，减少了吸热量，提高管壁温度，解决了整台换热器的低温腐蚀问题，提高了换热器低温段的使用寿命；同时因为高温烟气在进入热管换热器前经列管式(扰流子)换热器降温，降低了热管蒸发段的金属壁温，这样便大大降低了在热管换热器中热管爆管的可能性，提高了换热器高温段的使用寿命；设备结构简单、加工难度小，换热效率高、制造成本低。
A low-temperature corrosion-resistant air preheater with intermediate bypass of cold air, which mainly installs a cold air bypass pipe outside the air duct of the existing air preheater, its upper end communicates with the upper air duct, and its lower end At the entrance of the inlet pipe; a regulating valve is provided on the above-mentioned bypass pipe. The utility model adopts part of the cold air bypass, reduces the air volume of the preheater in the low temperature section, reduces the heat absorption, increases the temperature of the pipe wall, solves the low temperature corrosion problem of the whole heat exchanger, and improves the low temperature of the heat exchanger. At the same time, because the high-temperature flue gas is cooled by the tube-and-tube (spoiler) heat exchanger before entering the heat pipe heat exchanger, the metal wall temperature of the evaporation section of the heat pipe is reduced, which greatly reduces the heat exchange rate of the heat pipe. The possibility of explosion of the heat pipe in the device increases the service life of the high temperature section of the heat exchanger; the device has a simple structure, low processing difficulty, high heat exchange efficiency and low manufacturing cost.
Description
技术领域： Technical field:
本实用新型涉及一种热交换器，特别是组合式热管换热器。The utility model relates to a heat exchanger, in particular to a combined heat pipe heat exchanger.
背景技术： Background technique:
目前，组合式列管(扰流子)/热管换热器广泛应用在石油、化工、冶金等行业的加热炉节能设备中，组合式空气预热器结构大体相同，主要是由热管预热器与另一个热管预热器或列管式预热器组成的，其有型钢框架与侧板构成的预热器箱体，竖直的中间隔板一侧为烟气风道另一侧为空气风道，在烟气风道上端设有烟气进口管、下端设有烟气出口管，空气风道下端设与鼓风机相连的空气入口管，上端或烟气风道侧面设空气出口管。在上述预热器箱体下部设有热管预热器，上部设有列管式预热器或热管预热器。上述空气预热器可调的壁温范围有限，当冬天空气入口温度较低，不能完全避免发生低温腐蚀和结露积垢，这严重地影响了设备的使用寿命和加热系统的正常运行。因此人们采取了很多方法：如有人在低温段采用比较抗低温硫腐蚀的ND钢，但ND钢抗腐蚀能力有限，耐腐蚀性是普通碳钢的三倍左右，只能延缓腐蚀，并不能彻底的防止低温腐蚀，同时由于低温段结露而引起积垢，使烟气通道阻塞，影响系统正常运行；有人在空气入口处增加前置预热器，提高空气入口温度来提高管壁温度，但这需要消耗额外的热能；有人采取热风整体回流，即冷空气经过组合式预热器加热后，由空气预热器出口引出一部分热风返回至空气鼓风机入口和冷空气混合，提高空气入预热器的温度，提高管壁温度，但这部分循环的热风通过整个预热器，使空气阻力增加幅度较大，特别是列管式空气预热器部分，阻力大大增加，这样就要求大幅提高空气鼓风机功率，而增加电能消耗，或增大设备体积，以降低空气流动阻力，这将引起设备投资上升；还有人将空气整个打旁通，减少冷空气通过预热器的流量提高壁温，但也会造成排烟温度提高，造成能源的浪费，甚至当高温段采用的是热管预热器时，由于空气旁通，空气量减少，冷侧吸热量减少导致热管超温爆管。At present, the combined tube (spoiler)/heat pipe heat exchanger is widely used in energy-saving equipment for heating furnaces in petroleum, chemical, metallurgical and other industries. Composed of another heat pipe preheater or shell and tube preheater, it has a preheater box composed of a steel frame and side panels, and the vertical middle partition is the flue gas duct on one side and the air on the other. The air duct is provided with a flue gas inlet pipe at the upper end of the flue gas duct, a flue gas outlet pipe at the lower end, an air inlet pipe connected with a blower at the lower end of the air duct, and an air outlet pipe at the upper end or the side of the flue gas duct. A heat pipe preheater is arranged at the lower part of the above-mentioned preheater box body, and a shell-and-tube preheater or a heat pipe preheater is arranged at the upper part. The adjustable wall temperature range of the above-mentioned air preheater is limited. When the air inlet temperature is low in winter, low-temperature corrosion and condensation scaling cannot be completely avoided, which seriously affects the service life of the equipment and the normal operation of the heating system. Therefore, people have adopted many methods: For example, someone uses ND steel that is relatively resistant to low-temperature sulfur corrosion in the low-temperature section, but the corrosion resistance of ND steel is limited, and the corrosion resistance is about three times that of ordinary carbon steel. To prevent low-temperature corrosion, at the same time, due to condensation in the low-temperature section, fouling will be caused, which will block the flue gas channel and affect the normal operation of the system; some people add a pre-heater at the air inlet to increase the temperature of the air inlet to increase the temperature of the pipe wall, but This needs to consume additional heat energy; some people adopt the overall return of hot air, that is, after the cold air is heated by the combined preheater, a part of the hot air is drawn from the outlet of the air preheater and returns to the inlet of the air blower to mix with the cold air, increasing the air flow into the preheater. The temperature of the tube wall is increased, but this part of the circulating hot air passes through the whole preheater, which increases the air resistance greatly, especially in the tubular air preheater part, the resistance is greatly increased, which requires a large increase in the air blower. power, and increase power consumption, or increase the volume of equipment to reduce air flow resistance, which will lead to an increase in equipment investment; some people bypass the entire air to reduce the flow of cold air through the preheater and increase the wall temperature, but also It will cause the exhaust gas temperature to increase, resulting in a waste of energy. Even when the high temperature section uses a heat pipe preheater, due to the air bypass, the air volume is reduced, and the heat absorption of the cold side is reduced, resulting in the overheating of the heat pipe.
发明内容： Invention content:
本实用新型的目的在于提供一种换热效率高、使用寿命长、结构简单、设备成本低的热风中间回流抗低温腐蚀空气预热器。The purpose of the utility model is to provide a low-temperature corrosion-resistant air preheater with high heat exchange efficiency, long service life, simple structure and low equipment cost.
本实用新型主要是在现有的组合式列管/热管空气预热器的空气风道外侧增设一根冷风旁通管。该旁通管上端与组合空气预热器上部风道相连通，下端设在空气入口管的入口处。最好该冷风旁通管直径小于空气入口管直径。在上述旁通管上设有调节阀门。The utility model mainly adds a cold air bypass pipe outside the air duct of the existing combined tube/heat pipe air preheater. The upper end of the bypass pipe communicates with the upper air duct of the combined air preheater, and the lower end is arranged at the entrance of the air inlet pipe. Preferably, the diameter of the cold air bypass pipe is smaller than that of the air inlet pipe. A regulating valve is provided on the bypass pipe.
该组合空气预热器在工作时，大部分空气与低温段热管束冷凝段内的汽相传热工质进行热量交换，使其变为液体流至蒸发段，经过热交换升温后的空气和另一小部分经空气旁通管道从空气入口引过来的冷风混合后经空气风道进入列管式预热器管束内或经风道内的热管束冷凝段从空气出口排出，而高温烟气经列管式预热器或热管空气预热器降温后向下进入热管预热器烟气风道，其与热管束蒸发段内的液相传热工质进行热量交换，将热量传递给热管内的液体传热工质使其蒸发变为汽体，同时经过降温后的烟气则从烟气出口管排出。When the combined air preheater is working, most of the air exchanges heat with the vapor-phase heat transfer medium in the condensation section of the heat pipe bundle in the low-temperature section, so that it becomes a liquid and flows to the evaporation section. After heat exchange, the air heated up and another A small part of the cold air introduced from the air inlet through the air bypass pipe is mixed and then enters the tube bundle of the tube-and-tube preheater through the air duct or is discharged from the air outlet through the heat tube bundle condensation section in the air duct, while the high-temperature flue gas passes through the column After the tube preheater or heat pipe air preheater cools down, it enters the flue gas duct of the heat pipe preheater downwards, and it exchanges heat with the liquid-phase heat transfer medium in the evaporation section of the heat pipe bundle, and transfers the heat to the heat pipe in the heat pipe. The liquid heat transfer medium makes it evaporate into a vapor, and at the same time, the cooled flue gas is discharged from the flue gas outlet pipe.
本实用新型与现有技术相比具有如下优点：Compared with the prior art, the utility model has the following advantages:
1本实用新型采取了部分冷风旁通，减少了低温段预热器的空气量，减少了吸热量，提高管壁温度，解决了整台换热器的低温腐蚀问题，提高了换热器低温段的使用寿命。1 The utility model adopts partial cold air bypass, which reduces the air volume of the preheater in the low-temperature section, reduces the heat absorption, increases the temperature of the tube wall, solves the low-temperature corrosion problem of the whole heat exchanger, and improves the performance of the heat exchanger. The service life of the low temperature section.
2本实用新型能在烟气温度比较高的工况下使用，因为高温烟气在进入热管换热器前经列管式(扰流子)换热器降温，降低了热管蒸发段的金属壁温，这样便大大降低了在热管换热器中热管爆管的可能性，提高了换热器高温段的使用寿命。2. The utility model can be used under the condition of relatively high flue gas temperature, because the high-temperature flue gas is cooled by the tube-type (spoiler) heat exchanger before entering the heat pipe heat exchanger, which reduces the metal wall of the heat pipe evaporation section. temperature, which greatly reduces the possibility of the heat pipe bursting in the heat pipe heat exchanger and improves the service life of the high temperature section of the heat exchanger.
3本实用新型采取的是冷风在设备中部旁通的办法，高温段空气量没有减少，防止了高温段热管超温爆管，提高了换热器低温段的使用寿命。3. This utility model adopts the method of bypassing the cold air in the middle of the equipment, so that the air volume in the high temperature section is not reduced, which prevents the heat pipe from overheating and bursts in the high temperature section, and improves the service life of the low temperature section of the heat exchanger.
4设备结构简单、加工难度小，换热效率高、制造成本低。4 The equipment has simple structure, low processing difficulty, high heat exchange efficiency and low manufacturing cost.
附图说明： Description of drawings:
图1是本实用新型例1的主视剖面示意简图。Fig. 1 is a front view schematic diagram of Example 1 of the utility model.
图2是本实用新型例2的主视剖面示意简图。Fig. 2 is a schematic diagram of a front section of Example 2 of the utility model.
具体实施方式： Detailed ways:
在图1所示的冷风中间旁通抗低温腐蚀空气预热器的主视剖面示意简图中，其有型钢框架1与侧板构成的预热器箱体，竖直的中间隔板2一侧为烟气风道3另一侧为空气风道4，在烟气风道上端设有烟气进口管5、下端设有烟气出口管6；空气风道下端与空气入口管7相连，烟气风道的侧面设空气出口管8。在上述预热器箱体下部设有穿过中间隔板通孔的热管束9，其吸热段位于烟气风道内，端部置于端管板的通孔内；其放热段位于空气风道内，端部置于另一端管板的通孔内。在上述预热器箱体上部烟气风道一侧设内有扰流片外有翅片的列管式换热管束10，该管束的内端设在中间管板的通孔上，外端设在端管板的通孔上。在上述空气预热器的空气风道外侧设一根冷风旁通管11，其上端与上部风道相连通，下端设在空气入口管的入口处。在上述旁通管上设有调节阀门12。在图2所示的冷风中间旁通抗低温腐蚀空气预热器的主视剖面示意简图中，其有型钢框架1与侧板构成的预热器箱体，竖直的中间隔板2一侧为烟气风道3另一侧为空气风道4，在烟气风道上端设有烟气进口管5、下端设有烟气出口管6；空气风道下端与空气入口管7相连，上端设空气出口管13。在上述预热器箱体下部及上部均设有穿过中间隔板通孔的热管束9、14，其吸热段位于烟气风道内，端部置于端管板的通孔内；其放热段位于空气风道内，端部置于另一端管板的通孔内。在上述空气预热器的空气风道外侧设一根冷风旁通管11，其上端与上部风道相连通，下端设在空气入口管的入口处。在上述回流管上设有调节阀门12。In the schematic diagram of the front view of the low-temperature corrosion-resistant air preheater with cold air intermediate bypass shown in Fig. One side is the
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920011108U CN201387022Y (en) | 2009-03-04 | 2009-03-04 | Cold air intermediate bypass low temperature corrosion resistant air preheater |
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| CN200920011108U CN201387022Y (en) | 2009-03-04 | 2009-03-04 | Cold air intermediate bypass low temperature corrosion resistant air preheater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102741639A (en) * | 2010-02-06 | 2012-10-17 | Khd洪保德韦达克有限公司 | Method for increasing the reactivity of damp fuel |
| CN107228377A (en) * | 2016-03-24 | 2017-10-03 | 中国电力工程顾问集团有限公司 | A kind of energy saving air duct device and air and gas system |
| CN110762552A (en) * | 2019-12-09 | 2020-02-07 | 青岛德固特节能装备股份有限公司 | High temperature air preheater double tube sheet cooling air duct system |
| CN113587134A (en) * | 2021-09-02 | 2021-11-02 | 青岛德固特节能装备股份有限公司 | Air preheater |
| CN114543113A (en) * | 2022-02-28 | 2022-05-27 | 西安热工研究院有限公司 | System for controlling low-temperature corrosion of heated surface at tail of boiler |
-
2009
- 2009-03-04 CN CN200920011108U patent/CN201387022Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102741639A (en) * | 2010-02-06 | 2012-10-17 | Khd洪保德韦达克有限公司 | Method for increasing the reactivity of damp fuel |
| CN102741639B (en) * | 2010-02-06 | 2015-09-02 | Khd洪保德韦达克有限公司 | For improving reactive method of humid fuel |
| CN107228377A (en) * | 2016-03-24 | 2017-10-03 | 中国电力工程顾问集团有限公司 | A kind of energy saving air duct device and air and gas system |
| CN110762552A (en) * | 2019-12-09 | 2020-02-07 | 青岛德固特节能装备股份有限公司 | High temperature air preheater double tube sheet cooling air duct system |
| CN113587134A (en) * | 2021-09-02 | 2021-11-02 | 青岛德固特节能装备股份有限公司 | Air preheater |
| CN114543113A (en) * | 2022-02-28 | 2022-05-27 | 西安热工研究院有限公司 | System for controlling low-temperature corrosion of heated surface at tail of boiler |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20130304 |