A device for high-temperature flue gas waste heat treatment

Abstract

This utility model discloses a waste heat treatment device for high-temperature flue gas, including a flue gas channel connected to a desulfurization tower. A wastewater collection tank is connected below the desulfurization tower, and the wastewater collection tank is connected to a wastewater pretreatment tank. The wastewater pretreatment tank is connected to a wastewater treatment tank. A heat exchange section is provided on the flue gas channel, and a heat exchange chamber is provided outside the heat exchange section. A steam heat exchange pipe is provided on the wastewater treatment tank, including an inlet end and an outlet end. The outlet end is connected to the heat exchange chamber, and the heat exchange chamber is connected to the inlet end. A spray structure is provided inside the desulfurization tower, connected to a slurry tank, which is connected to a slurry preparation tank. A heat exchange pipe is also provided inside the flue gas channel, with one end connected to a water source and the other end connected to the slurry preparation tank. In this utility model, the flue gas undergoes two cooling and heat exchange cycles before entering the desulfurization tower for desulfurization, improving desulfurization efficiency and effect. Simultaneously, waste heat is recovered and utilized for heating wastewater and preheating the desulfurization slurry, improving waste heat utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery and treatment technology, specifically to a device for treating high-temperature flue gas waste heat. Background Technology

[0002] Currently, the high-temperature flue gas generated from coal combustion needs to undergo denitrification, desulfurization, and dust removal processes to meet standards before it can be released into the air. Due to the high temperature of the flue gas, it generally needs to be cooled before efficient desulfurization and dust removal can be carried out. This is usually achieved through flue gas waste heat recovery treatment structures. Common flue gas waste heat recovery and utilization structures generally include heat exchange tubes, where cold water exchanges heat with the high-temperature flue gas passing through the heat exchange tubes. However, in the above-mentioned flue gas waste heat recovery and utilization structures, relying solely on heat exchange tubes for waste heat recovery has the problem of low waste heat recovery efficiency. At the same time, there is also the problem of insufficient utilization of the water after heat exchange. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings in the aforementioned background technology by providing a waste heat treatment device for high-temperature flue gas that improves waste heat recovery and utilization.

[0004] To achieve the above objectives, this utility model provides a device for treating waste heat from high-temperature flue gas, which adopts the following technical solution: A device for treating waste heat from high-temperature flue gas includes a flue gas channel connected to a desulfurization tower. A wastewater collection tank is connected below the desulfurization tower, and the wastewater collection tank is connected to a wastewater pretreatment tank. The wastewater pretreatment tank is connected to a wastewater treatment tank. A heat exchange section is provided on the flue gas channel, and a heat exchange chamber is provided outside the heat exchange section. A steam heat exchange tube is provided on the wastewater treatment tank, including an inlet end and an outlet end. The outlet end is connected to the heat exchange chamber, and the upper end of the heat exchange chamber is connected to the inlet end via a connecting pipe. A spray structure is provided inside the desulfurization tower, connected to a slurry tank, which is connected to a slurry preparation tank. A heat exchange tube is also provided inside the flue gas channel, extending vertically out of the channel. One end of the heat exchange tube is connected to a water source, and the other end is connected to the slurry preparation tank.

[0005] A further improvement of this utility model for a high-temperature flue gas waste heat treatment device is that a second heat exchange tube is provided horizontally through the lower part of the wastewater pretreatment tank. One end of the second heat exchange tube is connected to the gas outlet, the other end is connected to the discharge pipe, and the other end is also connected to the heat exchange chamber.

[0006] A further improvement of this utility model for a high-temperature flue gas waste heat treatment device is that a steam generator is also provided on the side of the wastewater treatment tank, and the steam generator is connected to the air inlet end.

[0007] A further improvement of this utility model for a high-temperature flue gas waste heat treatment device is that a third heat exchange tube is provided in the slurry preparation tank, with one end of the third heat exchange tube connected to the heat exchange tube and the other end connected to the steam generator.

[0008] A further improvement of this utility model for a high-temperature flue gas waste heat treatment device is that the heat exchange tube is also connected to a steam generator. Compared with the prior art, the beneficial effects of this utility model are: This invention allows flue gas to undergo two cooling and heat exchange cycles before entering the desulfurization tower for desulfurization, thus improving desulfurization efficiency and effectiveness. At the same time, waste heat is recovered and utilized for heating wastewater and preheating desulfurization slurry, improving the utilization effect of waste heat. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1. Flue gas passage; 2. Heat exchange chamber; 3. Desulfurization tower; 4. Wastewater collection tank; 5. Wastewater pretreatment tank; 6. Wastewater treatment tank; 7. Inlet end; 8. Outlet end; 9. Second heat exchange tube; 10. Discharge pipe; 11. Heat exchange tube; 12. Slurry tank; 13. Slurry preparation tank; 14. Third heat exchange tube; 15. Steam generator. Detailed Implementation

[0010] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0011] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0012] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0014] like Figure 1 As shown, a high-temperature flue gas waste heat treatment device includes a flue gas channel 1 connected to a desulfurization tower 3. A wastewater collection tank 4 is connected below the desulfurization tower, the wastewater collection tank is connected to a wastewater pretreatment tank 5, and the wastewater pretreatment tank is connected to a wastewater treatment tank 6. A heat exchange section is provided on the flue gas channel 1, and the flue gas channel of the heat exchange section is made of a thermally conductive material. A heat exchange chamber 2 is provided outside the heat exchange section. The heat exchange chamber has a shell structure and is connected to the flue gas channel. The wastewater treatment tank 6 is equipped with a steam heat exchanger tube, which includes an inlet end 7 and an outlet end 8. The outlet end 8 is connected to the heat exchange chamber 2, and the upper end of the heat exchange chamber 2 is connected to the inlet end 7 via a connecting pipe. The desulfurization tower 3 is equipped with a spray structure, which is connected to the slurry tank 12. The slurry tank is connected to the slurry preparation tank 13. A heat exchanger tube 11 is also installed in the flue, extending vertically out of the flue. One end of the heat exchanger tube is connected to a water source, and the other end is connected to the slurry preparation tank 13. The heat exchanger tube is located between the heat exchange chamber and the desulfurization tower.

[0015] Furthermore, a second heat exchange tube 9 is provided in the lower part of the wastewater pretreatment tank 5, which runs horizontally through it. One end of the second heat exchange tube is connected to the air outlet 8, the other end is connected to the discharge pipe 10, and the other end is also connected to the heat exchange chamber 2.

[0016] Furthermore, a steam generator 15 is also provided on the side of the wastewater treatment tank 6, and the steam generator is connected to the air inlet.

[0017] A third heat exchange tube 14 is installed inside the slurry preparation tank 13, and the third heat exchange tube passes through the slurry preparation tank 13. One end of the third heat exchange tube is connected to the heat exchange tube, and the other end is connected to the steam generator.

[0018] Furthermore, the heat exchange tubes are also connected to the steam generator. When desulfurization slurry preparation is not performed, the water after heat exchange can directly enter the steam generator for steam production.

[0019] The working principle of this invention is as follows: Flue gas flows into the desulfurization tower through the flue gas channel. During the flow, it exchanges heat with the steam after heat exchange in the wastewater treatment tank, which further heats up the cooled steam in the wastewater treatment tank so that it can be recycled, thereby improving the waste heat utilization rate. After the first heat exchange and cooling in the heat exchange section, the flue gas passes through the heat exchange tube and undergoes a second heat exchange and cooling with the cold water in the tube before entering the desulfurization tower. The water after heat exchange can be used to prepare desulfurization slurry, preheat the desulfurization slurry through heat exchange, or enter the steam generator to produce steam. Overall, it improves the waste heat utilization effect of flue gas, improves the desulfurization effect, and makes full use of resources to achieve energy conservation.

[0020] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for high temperature flue gas waste heat treatment, characterized by: The system includes a flue gas duct connected to a desulfurization tower, a wastewater collection tank connected below the desulfurization tower, a wastewater pretreatment tank connected to the wastewater treatment tank, a heat exchange section on the flue gas duct, a heat exchange chamber on the outside of the heat exchange section, a steam heat exchange tube on the wastewater treatment tank, the steam heat exchange tube having an inlet end and an outlet end, the outlet end connected to the heat exchange chamber, the upper end of the heat exchange chamber connected to the inlet end via a connecting pipe, a spray structure inside the desulfurization tower connected to a slurry tank, the slurry tank connected to a slurry preparation tank, and a heat exchange tube extending vertically from the flue gas duct, one end of the heat exchange tube connected to a water source and the other end connected to the slurry preparation tank.

2. A device for high temperature flue gas waste heat treatment according to claim 1, characterized in that: The wastewater pretreatment tank is equipped with a second heat exchange tube that runs horizontally through the lower part. One end of the second heat exchange tube is connected to the air outlet, the other end is connected to the discharge pipe, and the other end is also connected to the heat exchange chamber.

3. A device for high temperature flue gas waste heat treatment according to claim 2, characterized in that: A steam generator is also installed next to the wastewater treatment tank, and the steam generator is connected to the air inlet.

4. A device for high temperature flue gas waste heat treatment according to claim 3, characterized in that: The slurry preparation tank is equipped with a third heat exchange tube, one end of which is connected to the heat exchange tube and the other end is connected to the steam generator.

5. A device for high temperature flue gas waste heat treatment according to claim 4, characterized in that: The heat exchange tube is also connected to a steam generator.

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