A desulfurization tower embedded with a phase change heat storage device

Abstract

This utility model discloses a desulfurization tower with an embedded phase change heat storage device, comprising: a desulfurization tower body, a flue gas inlet at the bottom side and a flue gas outlet at the top side of the desulfurization tower body, a desulfurization slurry inlet at the top side and a desulfurization slurry outlet at the bottom side of the desulfurization tower body; a heat storage tube assembly layer is provided on the inner wall of the desulfurization tower body, the heat storage tube assembly layer is non-uniformly distributed on the inner wall of the desulfurization tower body, the heat storage tube assembly layer is filled with phase change material, the heat storage tube assembly layer absorbs and stores the heat during the flue gas desulfurization process; a heat exchange enhancement structure is provided on the outer surface of the heat storage tube assembly layer to exchange heat during the flue gas desulfurization process; a temperature control valve is provided on the outside of the desulfurization tower body, the temperature control valve is connected to the heat storage tube assembly layer, the temperature control valve is connected to a heating system, and the temperature control valve controls the heat storage and heat release of the heat storage tube assembly layer to the heating system.

Description

Technical Field

[0001] This application belongs to the field of flue gas desulfurization and waste heat recovery technology, specifically referring to a desulfurization tower with an embedded phase change heat storage device. Background Technology

[0002] In conventional flue gas desulfurization technologies, most of them use the limestone-gypsum method to desulfurize high-temperature flue gas. This method absorbs the heat of high-temperature flue gas with limestone-gypsum slurry and then directly discharges it. The waste heat utilization rate of high-temperature flue gas in this method is less than 20%, resulting in heat waste.

[0003] Furthermore, using this traditional method, the temperature of the limestone-gypsum slurry fluctuates between 50-80℃, leading to a decrease in desulfurization efficiency. Therefore, additional temperature control equipment is needed to maintain a stable temperature of the limestone-gypsum slurry, which increases energy consumption. Moreover, traditional integrated thermal storage systems require external thermal storage tanks and heat exchangers, with pipeline heat loss exceeding 15%, resulting in wasted heat. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this application provides a desulfurization tower with an embedded phase change heat storage device, which directly absorbs the waste heat of the desulfurization slurry and releases it to the heating system through the phase change heat storage device integrated inside, thereby improving the heat absorption efficiency.

[0005] This utility model provides a desulfurization tower with an embedded phase change thermal storage device, including: a desulfurization tower body, wherein the desulfurization tower body has a flue gas inlet at the bottom side and a flue gas outlet at the top side, and a desulfurization slurry inlet at the top side and a desulfurization slurry outlet at the bottom side.

[0006] A heat storage tube assembly layer is provided on the inner wall of the desulfurization tower body. The heat storage tube assembly layer is not uniformly distributed on the inner wall of the desulfurization tower body. The heat storage tube assembly layer is filled with phase change material. The heat storage tube assembly layer absorbs and stores the heat during the flue gas desulfurization process.

[0007] The outer surface of the heat storage tube assembly layer is provided with a heat exchange enhancement structure to exchange heat during the flue gas desulfurization process.

[0008] A temperature control valve is installed on the outside of the desulfurization tower body. The temperature control valve is connected to the heat storage tube assembly layer and is connected to the heating system. The temperature control valve controls the heat storage and heat release of the heat storage tube assembly layer to the heating system.

[0009] Furthermore, in the desulfurization tower with an embedded phase change thermal energy storage device provided in this application, the thermal energy storage tube assembly layer includes thermal energy storage tubes arranged in a spiral trajectory, and the pitch of the spiral arrangement of the thermal energy storage tubes is 1.2-1.5 times the tube diameter.

[0010] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, the inner surface of the thermal storage tube is a stainless steel tube wall or a silicon carbide ceramic wall, the outer surface of the thermal storage tube is a polytetrafluoroethylene anti-corrosion layer, and the interior of the thermal contact tube is a phase change material filling layer and an expansion buffer layer, with the expansion buffer layer spaced between the material filling layers.

[0011] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, the phase change material of the phase change material filling layer includes a paraffin wax and an expanded graphite composite, wherein the mass ratio of the paraffin wax to the expanded graphite composite is 9:1.

[0012] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, the phase change material filling layer further includes premixed nano-thermal conductive particles of alumina material with an addition amount of 5wt%, and the phase change temperature of the phase change material filling layer is 50-80℃.

[0013] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, a desulfurization slurry spraying layer is provided inside the desulfurization tower body. The desulfurization slurry spraying layer is connected to the desulfurization slurry inlet and includes multiple slurry spraying ports.

[0014] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, the outer surface of the heat exchange enhancement structure is corrugated or finned.

[0015] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, a temperature sensor is also provided at the bottom of the desulfurization tower body. The temperature sensor is connected to the temperature control valve, and the temperature control valve controls the release of heat through linkage with the desulfurization slurry outlet via the temperature sensor.

[0016] Furthermore, in the desulfurization tower with an embedded phase change thermal storage device provided in this application, the response time of the opening and closing of the temperature control valve is ≤30 seconds.

[0017] The beneficial effects of this utility model are as follows: This application provides a desulfurization tower with an embedded phase change heat storage device. By embedding a phase change heat storage unit inside the desulfurization tower to absorb and store the heat generated during the flue gas desulfurization process, external heat storage devices are eliminated. By directly absorbing the waste heat of the desulfurization slurry and releasing it to the heating system, energy cascade utilization and desulfurization efficiency optimization are achieved. Furthermore, the slurry temperature fluctuations are smoothed through the heat storage / release process, improving the stability of the desulfurization reaction. And through temperature control valves, the efficiency of flue gas desulfurization and the dynamic coordination between heat storage and desulfurization processes are ensured, matching the nighttime heat release period with peak heating demand, thereby improving the utilization rate of flue gas heat. Attached Figure Description

[0018] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the desulfurization tower with an embedded phase change thermal storage device provided in the embodiments of this application.

[0020] Figure 2 This is a cross-sectional schematic diagram of the heat storage pipe structure provided in this embodiment.

[0021] The components in the diagram are labeled as follows: 1. Desulfurization tower body; 2. Desulfurization slurry spray layer; 3. Heat storage pipe assembly layer; 4. Heat exchange enhancement structure; 5. Temperature control valve; 6. Temperature sensor; 7. Inner surface of heat storage pipe; a. Polytetrafluoroethylene anti-corrosion layer; b. Phase change material filling layer; c. Expansion buffer layer; d. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] The embodiments of this application will now be further described in conjunction with the accompanying drawings and specific implementation details.

[0026] Figure 1 This is a schematic diagram of the structure of the desulfurization tower with an embedded phase change thermal storage device provided in the embodiments of this application.

[0027] like Figure 1 As shown, this embodiment provides a desulfurization tower with an embedded phase change thermal energy storage device, including a desulfurization tower body 1. The desulfurization tower body 1 has a flue gas inlet at its bottom side and a flue gas outlet at its top. The desulfurization tower body 1 also has a desulfurization slurry inlet at its top side and a desulfurization slurry outlet at its bottom. The bottom-in, top-out configuration of the high-temperature flue gas and the top-in, bottom-out configuration of the desulfurization slurry increases the contact time between the flue gas and the desulfurization slurry, thus improving the desulfurization efficiency of the high-temperature flue gas. A thermal energy storage tube assembly layer 3 is disposed on the inner wall of the desulfurization tower body 1. The thermal energy storage tube assembly layer 3 is non-uniformly distributed on the inner wall of the desulfurization tower body 1. The thermal energy storage tube assembly layer 3 is filled with phase change material and absorbs and stores the heat generated during the flue gas desulfurization process. By directly embedding the phase change thermal energy storage unit within the desulfurization tower body 1, an external energy storage device can be eliminated, greatly improving the thermal energy storage efficiency and reducing heat loss. The outer surface of the heat storage tube assembly layer 3 is provided with a heat exchange enhancement structure 4 for heat exchange during the flue gas desulfurization process. The heat exchange enhancement structure 4 exchanges heat with the high-temperature flue gas, absorbing the heat from the high-temperature flue gas. A temperature control valve 5 is installed outside the desulfurization tower body 1. The temperature control valve 5 is connected to the heat storage tube assembly layer 3 and is connected to a heating system. The temperature control valve 5 controls the heat storage and heat release of the heat storage tube assembly layer 3 to the heating system.

[0028] Specifically, in this embodiment, high-temperature sulfur-containing flue gas enters the desulfurization tower through a flue gas inlet located at the bottom side of the desulfurization tower body 1. Desulfurization slurry is injected into the desulfurization slurry inlet located at the top side of the desulfurization tower body 1. Inside the desulfurization tower, the high-temperature sulfur-containing flue gas and the desulfurization slurry undergo a desulfurization reaction and exchange heat through the heat exchange enhancement structure 4. The heat storage tube assembly layer 3 stores the exchanged heat. Heat exchange or storage through the heat storage tube assembly layer 3 and the heat exchange enhancement structure 4 can maintain and stabilize the temperature of the desulfurization slurry within a small range during the flue gas desulfurization process, ensuring that the flue gas desulfurization temperature remains at a suitable level. Simultaneously, the heat stored in the heat storage tube assembly layer 3 can be transferred to an external heating system through a temperature control valve 5, significantly improving the utilization efficiency of waste heat during the flue gas desulfurization process.

[0029] like Figure 1 As shown, the heat storage pipe assembly layer 3 includes heat storage pipes arranged in a spiral trajectory, with the helical pitch of the spiral arrangement being 1.2-1.5 times the pipe diameter. Specifically, in this embodiment, an annular support is welded to the inner wall of the desulfurization tower body 1, and the heat storage pipes are arranged on the annular support in a spiral trajectory. The spiral arrangement of the heat storage pipes increases the contact area and contact time between the heat-contact pipes and the high-temperature flue gas, which can effectively improve the heat storage efficiency of the heat storage pipes. In this embodiment, the pipe diameter of the heat storage pipe is set to 80 mm, and the helical pitch is 100 mm. The pipe diameter and helical pitch of the heat storage pipe can be adjusted according to actual needs.

[0030] Figure 2 This is a cross-sectional schematic diagram of the heat storage pipe structure provided in this embodiment.

[0031] like Figure 2 As shown, the heat storage tube is embedded in the inner wall of the desulfurization tower, and the inner surface 'a' of the heat storage tube is made of stainless steel or silicon carbide ceramic. The stainless steel material can be 316L type stainless steel.

[0032] The outer surface of the heat storage tube is coated with a polytetrafluoroethylene (PTFE) anti-corrosion layer b. The thickness of the PTFE anti-corrosion layer b coating on the outer wall of the heat storage tube is 0.2 mm to 0.5 mm. This PTFE anti-corrosion layer b can withstand a corrosive environment with pH = 4-6. In this embodiment, the curing process of the PTFE anti-corrosion layer b involves baking at 150°C for 2 hours; the thickness tolerance of the PTFE anti-corrosion layer b is ±0.05 mm.

[0033] The heat-contact tube contains a phase change material filling layer c and an expansion buffer layer d, with the expansion buffer layers d spaced between the material filling layers. The phase change material filling layer c comprises a paraffin wax and expanded graphite composite, with a mass ratio of paraffin wax to expanded graphite composite of 9:1. The phase change material filling layer c also contains premixed nano-thermal conductive particles with an added amount of 5 wt% alumina material. The phase change temperature of the phase change material filling layer c is 50-80℃. The expansion buffer layer d provides 12% volume expansion space. The phase change material in the phase change material filling layer c can also be other suitable combinations of materials, which will not be elaborated here.

[0034] like Figure 1 As shown, a desulfurization slurry spray layer 2 is provided inside the desulfurization tower body 1. The desulfurization slurry spray layer 2 is connected to the desulfurization slurry inlet and includes multiple slurry spray nozzles. Specifically, the inlet pipe of the desulfurization slurry spray layer 2 is connected to the desulfurization slurry inlet, and multiple slurry spray nozzles are provided below the desulfurization slurry spray pipe. The desulfurization slurry is sprayed out from the slurry spray nozzles and reacts with the high-temperature flue gas inside the desulfurization tower for desulfurization. The multiple slurry spray nozzles increase the contact area between the desulfurization slurry and the high-temperature flue gas, thereby improving the efficiency of the desulfurization reaction between the desulfurization slurry and the high-temperature flue gas.

[0035] In this embodiment, the outer surface of the heat exchange enhancement structure 4 is corrugated or finned. The corrugated or finned heat exchange enhancement structure 4 can increase the contact area with the high-temperature flue gas, increasing the contact area by more than 40% and improving the heat exchange efficiency.

[0036] A temperature sensor 6 is installed at the bottom of the desulfurization tower body 1. The temperature sensor 6 is connected to the temperature control valve 5, and the temperature control valve 5 controls the release of heat through linkage with the desulfurization slurry outlet via the temperature sensor 6. The response time of the opening and closing of the temperature control valve 5 is ≤30 seconds. In this embodiment, the linkage control between the temperature sensor 6 and the temperature control valve 5 can maintain and stabilize the temperature of the desulfurization slurry within a small range during the flue gas desulfurization process, ensuring that the flue gas desulfurization temperature remains at a suitable level. Furthermore, under the premise of satisfying the desulfurization reaction requirements, the waste heat is transferred to an external heating system, which not only prioritizes the heat storage / release logic of desulfurization efficiency but also greatly improves the utilization efficiency of waste heat during the flue gas desulfurization process.

[0037] In this embodiment, the heat storage and desulfurization processes of the desulfurization tower are innovatively controlled, and the heat storage and desulfurization processes are dynamically coordinated. The nighttime heat release period is matched with the peak heating demand, which improves the utilization rate of flue gas heat.

[0038] This application provides a desulfurization tower with an embedded phase change thermal storage device. By embedding a phase change thermal storage unit inside the desulfurization tower to absorb and store the heat generated during the flue gas desulfurization process, it eliminates the need for an external thermal storage device. It directly absorbs the waste heat from the desulfurization slurry and releases it to the heating system, achieving cascaded energy utilization and optimized desulfurization efficiency. Furthermore, it smooths out slurry temperature fluctuations during the heat storage / release process, improving the stability of the desulfurization reaction. A temperature control valve 5 ensures the efficiency of flue gas desulfurization and the dynamic coordination between thermal storage and the desulfurization process, matching the nighttime heat release period with peak heating demand and improving the utilization rate of flue gas heat.

[0039] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0040] The above provides a detailed description of a desulfurization tower with an embedded phase change thermal storage device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A desulfurization tower with an embedded phase change thermal storage device, characterized in that, include: The desulfurization tower body has a flue gas inlet at the bottom side and a flue gas outlet at the top side, and a desulfurization slurry inlet at the top side and a desulfurization slurry outlet at the bottom side. A heat storage tube assembly layer is provided on the inner wall of the desulfurization tower body. The heat storage tube assembly layer is not uniformly distributed on the inner wall of the desulfurization tower body. The heat storage tube assembly layer is filled with phase change material. The heat storage tube assembly layer absorbs and stores the heat during the flue gas desulfurization process. The outer surface of the heat storage tube assembly layer is provided with a heat exchange enhancement structure to exchange heat during the flue gas desulfurization process. A temperature control valve is installed on the outside of the desulfurization tower body. The temperature control valve is connected to the heat storage tube assembly layer and is connected to the heating system. The temperature control valve controls the heat storage and heat release of the heat storage tube assembly layer to the heating system.

2. The desulfurization tower with an embedded phase change thermal storage device according to claim 1, characterized in that, The thermal storage tube assembly layer includes thermal storage tubes arranged in a spiral trajectory, wherein the pitch of the spiral arrangement of the thermal storage tubes is 1.2-1.5 times the tube diameter.

3. The desulfurization tower with an embedded phase change thermal storage device according to claim 2, characterized in that, The inner surface of the heat storage tube is a stainless steel tube wall or a silicon carbide ceramic wall, the outer surface of the heat storage tube is a polytetrafluoroethylene anti-corrosion layer, and the interior of the heat storage tube is a phase change material filling layer and an expansion buffer layer, with the expansion buffer layer spaced between the material filling layers.

4. The desulfurization tower with an embedded phase change thermal storage device according to claim 3, characterized in that, The phase change material filling layer comprises a paraffin wax and an expanded graphite composite, wherein the mass ratio of the paraffin wax to the expanded graphite composite is 9:

1.

5. The desulfurization tower with an embedded phase change thermal storage device according to claim 4, characterized in that, The phase change material filling layer also contains premixed nano-thermal conductive particles with an added amount of 5 wt% aluminum oxide material, and the phase change temperature of the phase change material filling layer is 50-80℃.

6. The desulfurization tower with an embedded phase change thermal storage device according to claim 1, characterized in that, A desulfurization slurry spraying layer is provided inside the desulfurization tower body. The desulfurization slurry spraying layer is connected to the desulfurization slurry inlet and includes multiple slurry spraying ports.

7. The desulfurization tower with an embedded phase change thermal storage device according to claim 1, characterized in that, The outer surface of the heat exchange enhancement structure is corrugated or finned.

8. The desulfurization tower with an embedded phase change thermal storage device according to claim 1, characterized in that, A temperature sensor is also installed at the bottom of the desulfurization tower body. The temperature sensor is connected to the temperature control valve. The temperature control valve controls the release of heat through linkage with the desulfurization slurry outlet via the temperature sensor.

9. The desulfurization tower with an embedded phase change thermal storage device according to claim 8, characterized in that, The response time for opening and closing the temperature control valve is ≤30 seconds.

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