Heat pipe condensing device

Abstract

The utility model discloses a heat pipe condensing device which is connected into a flue gas system and located on a flue between a desulfurizing tower and a chimney. The heat pipe condensing device comprises a heat exchange pipe bundle, a condensed water discharge tank, a condensed water delivery pump and a condensed water treatment tank; the heat exchange tube bundle is used for absorbing flue gas heat and transferring the heat to demineralized water through a heat transfer working medium, and a condensate water drainage groove is formed in the bottom of the heat exchange tube bundle; the condensate water discharge tank is sequentially connected with a condensate water delivery pump and a condensate water treatment tank through a pipeline, and the condensate water treatment tank is used for discharging treated condensate water. According to the heat pipe condensing device, the heat pipe technology is adopted, heat transfer is achieved through working medium phase change, the heat pipe condensing device has a series of advantages of being extremely high in heat conductivity, good in isothermal property, controllable in temperature and the like, water can be saved, carbon can be reduced, the purpose of eliminating white smoke plume in smoke can be achieved, and the heat pipe condensing device has wide application prospects and popularization value.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas treatment, and in particular relates to a heat pipe condensing device. Background Art

[0002] With the rapid development of the power industry, coal-fired power plants, as one of the main sources of electricity supply, have attracted increasing attention from all walks of life regarding their flue gas emissions.

[0003] Among flue gas treatment technologies, wet flue gas desulfurization (FGD) is widely used due to its simple operation, high desulfurization efficiency, and wide applicability. During the desulfurization process, the flue gas temperature drops, saturating it with water vapor. This flue gas is discharged directly through the chimney, where it condenses into tiny droplets upon contact with the relatively cool ambient air. The acidic condensed water not only corrodes the chimney but also creates a "white plume," creating visual pollution, negatively impacting corporate image, and causing significant disruption to surrounding residents. Furthermore, high humidity promotes the conversion of gaseous pollutants into secondary particulate matter and the growth of these particles by absorbing moisture, contributing to the formation of localized smog.

[0004] Furthermore, severe water shortages are common in much of China, necessitating energy and water conservation during manufacturing processes to alleviate water pressure and generate significant economic benefits. Therefore, cooling and condensing flue gas to reduce harmful emissions, eliminate white smoke, and simultaneously conserve energy and water are pressing challenges for energy conservation, carbon reduction, and environmental protection.

[0005] In the prior art, the heat exchange tubes used in flue gas coolers and condensers mainly include: (1) non-metallic tube condensation, which uses fluoroplastics, glass and other materials to make heat exchange tubes. This can effectively prevent the corrosion of flue gas condensate, but can only be made into bare tubes. In the condensation process of low-temperature saturated wet flue gas, the heat exchange efficiency of such heat exchange tubes is extremely low, the equipment layout space is large, and the investment is large. (2) metal tube condensation, which uses corrosion-resistant materials such as duplex stainless steel to make heat exchange tubes. The advantage is that the fins outside the tubes can enhance heat transfer, the heat transfer efficiency is high, and the layout space is compact. However, as the unit load changes, it is easy to cause leakage of the heat exchange tubes, and a large amount of cooling water will enter the flue or chimney, aggravating corrosion and exacerbating the white smoke plume phenomenon. Utility Model Content

[0006] In response to the shortcomings of the existing technology, the present invention provides a heat pipe condensing device. The device adopts heat pipe technology and transfers heat through phase change of working fluid. It has a series of advantages such as extremely high thermal conductivity, good isothermal performance, and controllable temperature. The device can not only efficiently cool and condense the flue gas, but also recover the waste heat of the low-temperature flue gas to heat the low-temperature desalted water. At the same time, it can collect the condensed water in the flue gas and conduct centralized treatment. After meeting the standards, it can be used for production and life, saving water and reducing carbon emissions, and achieving the purpose of eliminating white smoke plumes from the flue gas. It has the advantages of efficient heat transfer, compact structure, deep utilization of the waste heat of low-temperature flue gas, while achieving the elimination of white smoke plumes and the reuse of condensed water in the flue gas. It improves the efficiency and stability of flue gas treatment, and can extend the service life of the heat pipe, reduce the operating costs of enterprises, and has broad application prospects and promotion value.

[0007] The utility model is realized through the following technical solutions:

[0008] A heat pipe condensing device is connected to the flue gas system and is located on the flue between the desulfurization tower and the chimney. The heat pipe condensing device includes a heat exchange tube bundle, a condensate drainage trough, a condensate delivery pump, and a condensate treatment tank. A condensate drainage trough is provided at the bottom of the heat exchange tube bundle, and the condensate drainage trough is connected to the condensate delivery pump and the condensate treatment tank in sequence through a pipeline. The condensate treatment tank discharges treated condensate.

[0009] The heat exchange tube bundle is composed of a plurality of parallel heat pipes, each of which includes a condensing section and an evaporating section. A support is provided in the middle of the heat pipe for fixing the plurality of parallel heat pipes to form a heat exchange tube bundle. The evaporating section is a finned tube type and is arranged in the flue between the desulfurization tower and the chimney. A condensate drainage trough is provided below the evaporating section. The condensing section includes a lower header tube, a water jacket and an upper header tube. The water jacket is sleeved on the outer side of the tube wall of the heat pipe. The lower header tube is vertically arranged at the lower end of the water jacket, and the upper header tube is vertically arranged at the upper end of the water jacket. The upper header tube and the lower header tube are both tubular structures with one end closed and the other end open. The upper header tube and the lower header tube connect the tube cavities in each water jacket on the plurality of heat pipes into one.

[0010] Preferably, the interior of the heat pipe is pumped with negative pressure and is filled with a heat transfer medium.

[0011] Preferably, the support member is located between the evaporation section and the condensation section of the heat pipe and is a long strip structure. Mounting holes are provided on the wall of the heat pipe. The number of mounting holes is the same as the number of heat pipes in the heat exchange tube bundle. The diameter of the mounting holes matches the outer diameter of the heat pipe. The heat pipe and the support member are fixed by welding through the mounting holes.

[0012] Preferably, the heat exchange tube bundle is arranged obliquely in the vertical direction, and the top end of the condensation section is higher than the bottom end of the evaporation section.

[0013] Preferably, a shell is provided outside the heat exchange tube bundle.

[0014] Preferably, the evaporation section adopts spiral finned tubes.

[0015] Preferably, the heat exchange tube bundle is made of ND steel; and a hydrophobic coating is sprayed on the outer tube wall of the heat pipe.

[0016] Preferably, a mesh sponge is provided in the condensate drainage trough; and the condensate treatment box is provided with an anti-corrosion lining.

[0017] Preferably, the heat exchange tube bundle is a split structure, the condensing section and the evaporating section are separated from each other, and the condensing section and the evaporating section are connected to form a circulation loop via a steam riser and a condensate return pipe.

[0018] The beneficial effects of the utility model are as follows:

[0019] (1) High-efficiency heat transfer: The heat pipe condensation device of this utility model utilizes the high-efficiency heat transfer performance of the heat pipe to quickly transfer the heat in the flue gas to the heat transfer medium, thereby achieving rapid cooling of the flue gas. This performance can also make the heat exchange equipment compact and reduce space usage. At the same time, a hydrophobic coating is sprayed on the surface of the heat exchange tube to achieve the transformation from film condensation to bead condensation, significantly improving the condensation heat transfer coefficient and enhancing the heat transfer capacity.

[0020] (2) Anti-corrosion: The heat pipe condensing device of the present invention adopts anti-corrosion materials and hydrophobic coatings, has anti-corrosion properties, can effectively resist corrosive substances in the flue gas, and extend the service life.

[0021] (3) Reduce the flue load pressure: The heat pipe condensing device of the present invention can adopt a split structure to separate the evaporation section and the condensation section from each other, which has the advantages of reducing the flue load and reducing the risk of damage to the flue due to overload. At the same time, it has the advantages of no external power, flexible layout, adjustable heat flux density, effective prevention of leakage of hot and cold fluids, realization of online performance recovery, and low cost of subsequent maintenance and replacement.

[0022] (4) Deep utilization of waste heat: The heat pipe condensation device of the utility model can recover the sensible heat and latent heat of low-temperature flue gas, heat low-temperature desalted water, and realize deep recovery and utilization of waste heat.

[0023] (5) Environmental protection and energy saving: The heat pipe condensation device of this utility model can further treat the condensed water after the flue gas is cooled and condensed. After the condensed water meets the treatment standards, it can be reused, which can reduce the emission of harmful substances and eliminate white smoke plumes, which is friendly to the environment. At the same time, the device can also recycle condensed water, reducing the company's operating costs and water pressure.

[0024] (6) The effect of eliminating white smoke plume is significant: the heat pipe condensation device of the utility model condenses the flue gas after cooling through the condensation section, converting water vapor into liquid water, thereby achieving the purpose of eliminating white smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the heat pipe condensation device in the flue gas system;

[0026] Figure 2 Schematic diagram of the structure of the heat pipe condensation device;

[0027] Figure 3 The structural diagram (A) and the tilt diagram (B) of the heat exchange tube bundle are shown;

[0028] Figure 4 It is a structural diagram of a split heat pipe condensing device;

[0029] In the figure: 100, desulfurization tower; 200, heat pipe condensing device; 210, heat exchange tube bundle; 211, heat pipe; 212, support member; 213, lower header pipe; 214, water jacket; 215, upper header pipe; 216, steam riser; 217, condensate return pipe; 220, condensate drain tank; 230, condensate transfer pump; 240, condensate treatment tank; 250, flue gas; 260, desalted water; 270, condensate; 300, chimney. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0031] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in this specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the utility model without substantially changing the technical content.

[0032] Example 1

[0033] A heat pipe condensing device 200, such as Figure 1 As shown, the heat pipe condensation device 200 is connected to the flue gas system and is located on the flue between the desulfurization tower 100 and the chimney 300.

[0034] like Figure 1 、 2 As shown, the heat pipe condensation device 200 includes a heat exchange tube bundle 210, a condensate drain trough 220, a condensate delivery pump 230, and a condensate treatment tank 240. The condensate drain trough 220 is located at the bottom of the heat exchange tube bundle 210 to collect condensate generated by the device. The condensate drain trough 220 is connected to the condensate delivery pump 230 and the condensate treatment tank 240 via a pipeline. The condensate treatment tank 240 discharges treated condensate. The condensate delivery pump 230 is used to deliver condensate from the condensate drain trough 220 to the condensate treatment tank 240. The condensate treatment tank 240 can store and centrally treat the condensate. The condensate can undergo water treatment processes such as pH adjustment in the condensate treatment tank 240. Once treated to meet standards, it can be reused as makeup water for multiple processes within the plant. This not only saves on cold water usage but also prevents the discharge of untreated condensate into the environment, reducing pollution.

[0035] like Figure 2 and Figure 3 As shown in Figure A, the heat exchange tube bundle 210 is an axial heat pipe type, consisting of several parallel heat pipes 211. Negative pressure is applied to the interior of the heat pipes 211, which are filled with a heat transfer medium. The heat pipes 211 include a condensing section and an evaporating section. The evaporating section is a finned tube type and is located in the flue between the desulfurization tower 100 and the chimney 300. A condensate drain trough 220 is located below the evaporating section. The condensing section is a water-jacketed type, comprising a lower header tube 213, a water jacket 214, and an upper header tube 215. The water jacket 214 is sleeved onto the outer wall of the heat pipe 211. The lower header tube 213 is perpendicularly mounted at the lower end of the water jacket 214, and the upper header tube 215 is perpendicularly mounted at the upper end of the water jacket 214. Both the upper header tube 215 and the lower header tube 213 are tubular structures with one end closed and the other open. The upper header tube 215 and the lower header tube 213 connect the lumens within the water jackets 214 of several heat pipes 211 into a single entity. Low-temperature desalted water flows through the jacket cavity between the water jacket 214 and the heat pipe 211. The outer wall of the evaporation section is in direct contact with the flue gas. The heat transfer medium in the evaporation section of the heat pipe 211 absorbs heat from the flue gas and transfers it to the low-temperature desalted water within the jacket of the condensing section of the heat pipe 211.

[0036] like Figure 2 and Figure 3As shown in Figure A, a support member 212 is provided in the middle of the heat pipe 211 for fixing a plurality of heat pipes 211 arranged in parallel to form a heat exchange tube bundle 210. The support member 212 is located between the evaporation section and the condensation section of the heat pipe 211 and is a long strip structure. Mounting holes are provided on the tube wall of the heat pipe 211. The number of mounting holes is the same as the number of heat pipes 211 in the heat exchange tube bundle 210. The diameter of the mounting hole matches the outer diameter of the heat pipe 211. The heat pipe 211 and the support member 212 are welded and fixed through the mounting holes to support the weight of the heat exchange tube bundle 210 and related components. At the same time, it plays a role in isolating the heat source from the cold source, reducing the possibility of mixing of the cold source and the heat source during operation.

[0037] like Figure 3 As shown in B, in order to ensure that the condensed water after the water vapor in the flue gas is cooled does not obstruct the fins and flows into the condensate drain groove 220 by gravity, while strengthening the phase change heat transfer and circulation power of the heat transfer medium in the heat exchange tube bundle 210, the heat exchange tube bundle 210 is arranged tilted in the vertical direction. The heat pipes 211 in the heat exchange tube bundle 210 can be tilted at a certain angle in the direction shown in the figure or in any direction, and the top of the condensation section must be higher than the bottom of the evaporation section.

[0038] A preferred solution, such as Figure 2 As shown, the heat exchange tube bundle 210 is provided with a shell outside to support and fix the entire heat exchange equipment.

[0039] In a preferred solution, the evaporation section uses high-frequency welded spiral fin tubes that are resistant to performance attenuation as enhanced heat transfer and heat exchange elements.

[0040] In a preferred solution, the heat exchange tube bundle 210 is made of corrosion-resistant ND steel, which can effectively resist corrosive substances in the flue gas and extend the service life.

[0041] A preferred solution is that a hydrophobic coating is sprayed on the outer tube wall of the heat pipe 211, so that the condensate forms dispersed droplets when in contact, realizing the transformation from film condensation to bead condensation, significantly improving the condensation heat transfer coefficient, enhancing the heat transfer capacity, and at the same time having anti-corrosion properties to protect the base tube.

[0042] In a preferred solution, a mesh sponge is provided in the condensate drainage groove 220 to further filter out large particles of impurities in the condensate.

[0043] In a preferred solution, the condensate treatment tank is provided with an anti-corrosion lining to extend the service life of the device.

[0044] A preferred solution is to design the heat pipe condensing device 200 as a split structure, particularly suitable for applications requiring high flue gas ducting or tight sealing requirements, where major modifications to the existing flue gas ducting system are unavoidable. In this design, the condensing and evaporating sections of the heat exchange tube bundle 210 can be installed a certain distance apart, with the condensing section installed outside the flue to reduce flue load and effectively prevent leakage of hot and cold fluids, enhancing system reliability and stability. This split design also features the advantages of no external power, flexible layout, adjustable heat flux density, online performance recovery, and low subsequent maintenance and replacement costs.

[0045] like Figure 4 As shown, this split structure still consists of an evaporation section and a condensation section of a heat exchange tube bundle 210. The heat exchange tube bundle 210 contains a heat transfer medium. The evaporation section and the condensation section are separated from each other and connected to form a circulation loop through a steam riser 216 and a condensate return pipe 217 for the heat transfer medium. The evaporation section is set in the flue and absorbs the heat of the flue gas. The heat is transferred to the heat transfer medium therein through a heat-absorbing tube bundle (such as finned tubes). The heat transfer medium absorbs heat and changes from liquid phase to vapor phase, which is then transferred to the condensation section through the steam riser 216. The condensation section is installed outside the flue. The vapor phase heat transfer medium transfers heat to the cold fluid (low-temperature desalted water) through a heat-releasing tube bundle (such as heat pipe 211), thereby condensing and changing to a liquid phase. The heat transfer medium then flows back to the evaporation section through the condensate return pipe 217 to work in sequence. The cycle is repeated, and the purpose of heat exchange between cold and hot fluids is achieved through efficient split phase change heat transfer.

[0046] The operation process of the above heat pipe condensation device is as follows: Figure 1-4 The specific steps are as follows:

[0047] (1) The flue gas 250 from the desulfurization tower 100 enters the flue, and the flue is provided with an evaporation section of a heat exchange tube bundle 210. The evaporation section absorbs the heat of the flue gas, and the heat is transferred to the heat transfer medium in the heat pipe 211 through the heat exchange tube bundle 210. The heat transfer medium absorbs heat and changes from liquid phase to vapor phase, and rises to enter the condensation section of the heat exchange tube bundle 210 (in the split design, the vapor phase heat transfer medium is transferred to the condensation section through the steam riser 216).

[0048] (2) Low-temperature desalted water 260 is introduced into the condensing section of the heat exchange tube bundle 210 from the lower header pipe 213, and the low-temperature desalted water 260 is evenly distributed into each water jacket 214; the condensing section is arranged outside the flue, and the vapor phase heat transfer medium transfers heat to the low-temperature desalted water 260 in the water jacket 214 through the heat pipe 211, thereby condensing and transforming into liquid phase, and returning to the evaporation section for circulation (in the split design, the liquid phase heat transfer medium returns to the evaporation section through the condensate return pipe 217); the low-temperature desalted water 260 in the water jacket 214 absorbs the heat of the flue gas and then flows into the upper header pipe 215, and flows out of the heat exchange tube bundle 210, completing the heat exchange process of transferring the heat of the flue gas to the desalted water.

[0049] (3) The flue gas 250 is cooled and condensed and then discharged through the chimney 300.

[0050] (4) After the flue gas 250 exchanges heat with the desalted water 260, condensed water 270 is generated. The condensed water 270 first flows to the condensed water drain trough 220 at the bottom of the heat exchange tube bundle 210 by gravity, and then is transported to the condensed water treatment tank 240 by the condensed water delivery pump 230 for water treatment. After meeting the standards, it is reused in the plant process production.

[0051] The heat pipe condensation device and process described above can reduce harmful emissions and eliminate white smoke plumes, making it environmentally friendly. Furthermore, the device offers energy-saving advantages, reducing operating costs for businesses.

[0052] The embodiments described above are only some of the embodiments of the present invention, not all of them. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. The scope of protection of the present invention shall be based on the scope required by the claims. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A heat pipe condensing device, characterized in that: The heat pipe condensing device is connected to the flue gas system and is located on the flue between the desulfurization tower and the chimney; the heat pipe condensing device includes a heat exchange tube bundle, a condensate drainage trough, a condensate delivery pump and a condensate treatment tank; a condensate drainage trough is provided at the bottom of the heat exchange tube bundle, and the condensate drainage trough is connected to the condensate delivery pump and the condensate treatment tank in sequence through a pipeline, and the condensate treatment tank discharges the treated condensate; The heat exchange tube bundle is composed of a plurality of parallel heat pipes, each of which includes a condensing section and an evaporating section. A support is provided in the middle of the heat pipe for fixing the plurality of parallel heat pipes to form a heat exchange tube bundle. The evaporating section is a finned tube type and is arranged in the flue between the desulfurization tower and the chimney. A condensate drainage trough is provided below the evaporating section. The condensing section includes a lower header tube, a water jacket and an upper header tube. The water jacket is sleeved on the outer side of the tube wall of the heat pipe. The lower header tube is vertically arranged at the lower end of the water jacket, and the upper header tube is vertically arranged at the upper end of the water jacket. The upper header tube and the lower header tube are both tubular structures with one end closed and the other end open. The upper header tube and the lower header tube connect the tube cavities in each water jacket on the plurality of heat pipes into one.

2. The heat pipe condensing device according to claim 1, characterized in that: The interior of the heat pipe is negatively pressurized and filled with a heat transfer medium.

3. The heat pipe condensing device according to claim 1, characterized in that: The support member is located between the evaporation section and the condensation section of the heat pipe and is a long strip structure. Mounting holes are opened on the tube wall of the heat pipe. The number of mounting holes is the same as the number of heat pipes in the heat exchange tube bundle. The diameter of the mounting hole matches the outer diameter of the heat pipe. The heat pipe and the support member are welded and fixed through the mounting holes.

4. The heat pipe condensing device according to claim 1, characterized in that: The heat exchange tube bundle is arranged obliquely in the vertical direction, and the top end of the condensation section is higher than the bottom end of the evaporation section.

5. The heat pipe condensing device according to claim 1, characterized in that: A shell is provided outside the heat exchange tube bundle.

6. The heat pipe condensing device according to claim 1, characterized in that: The evaporation section adopts spiral finned tubes.

7. The heat pipe condensing device according to claim 1, characterized in that: The heat exchange tube bundle is made of ND steel; the outer tube wall of the heat pipe is sprayed with a hydrophobic coating.

8. The heat pipe condensing device according to claim 1, characterized in that: The condensate drainage trough is provided with a mesh sponge; the condensate treatment box is provided with an anti-corrosion lining.

9. The heat pipe condensing device according to claim 1, characterized in that: The heat exchange tube bundle is a split structure, the condensing section and the evaporating section are separated from each other, and the condensing section and the evaporating section are connected to form a circulation loop via a steam riser and a condensate return pipe.

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