Waste heat energy-saving device for acid regeneration unit
By adding heat exchangers and fans to the acid regeneration unit, heat exchange between combustion-assisted air and high-temperature flue gas is achieved, and the problem of large heat energy loss of room temperature combustion-assisted air is solved, which reduces heat energy consumption and improves combustion efficiency.
Patent Information
- Application Number
- CN202421618037.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-09
AI Technical Summary
In acid regeneration units, the room-temperature combustion-assisted air requires a large amount of heat energy during combustion, resulting in large heat energy loss.
Add a heat exchanger between the pre-concentrator and the absorption tower, and a fan is installed at the bottom of the heat exchanger to allow heat exchange of room temperature combustion air with high-temperature flue gas, increase the temperature of the combustion air and reduce the flue gas temperature.
Through the setting of heat exchangers and fans, the heat energy loss is reduced, the temperature of the combustion-stimulating air is increased, the heat energy consumption is reduced, and the combustion-stimulating needs are met.
Smart Images
Figure CN223077445U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of acid regeneration, in particular to a waste heat energy-saving device for an acid regeneration unit. Background Art
[0002] In an acid regeneration unit, when the hot air generated by a burner heats the central area of a roasting furnace to 500 - 800 °C, the pre-concentrated acid sprayed from the top of the furnace is decomposed to generate substances such as hydrochloric acid and iron(III) oxide. The flue gas flows along a pipeline at the top of the roasting furnace, enters a separator and then a pre-concentrator. The flue gas of the pre-concentrator directly enters an absorption tower through a pipeline. This part of the flue gas at a relatively high temperature passes through the absorption tower and a scrubbing tower and is finally discharged into the atmosphere. During the combustion process of the burner, a large amount of combustion-supporting air is required. For example, for a unit with a waste acid treatment capacity of 3.2 m³ / h, 4700 m³ / h of combustion-supporting air is required per hour. This combustion-supporting air at normal temperature needs to absorb a large amount of heat energy during combustion. Summary of the Utility Model
[0003] In view of this, the present application provides a waste heat energy-saving device for an acid regeneration unit. A heat exchanger is added between the pre-concentrator and the absorption tower, and a fan is arranged at the bottom of the heat exchanger to raise the temperature of the normal-temperature combustion-supporting air and reduce heat energy loss.
[0004] According to one aspect of the present application, there is provided a waste heat energy-saving device for an acid regeneration unit, including a roasting furnace, a separator, a pre-concentrator, a heat exchanger, an absorption tower and a fan; the roasting furnace is suitable for heating pre-concentrated acid, and a spraying pipe is arranged at the top of the roasting furnace, which is suitable for spraying pre-concentrated acid; the separator is arranged on one side of the roasting furnace, and there is a pipeline connection between the top of the roasting furnace and one side of the top of the separator, and the separator separates particulate matter in the flue gas; the pre-concentrator is arranged on the opposite side of the separator from the roasting furnace, and there is a pipeline connection between the pre-concentrator and the separator, and the pre-concentrator is used to increase the concentration of waste acid; the absorption tower is arranged on the opposite side of the pre-concentrator from the separator, and there is a pipeline connection between the absorption tower and the pre-concentrator; the heat exchanger is arranged between the pre-concentrator and the absorption tower, both the pre-concentrator and the absorption tower are pipeline-connected to the heat exchanger, and the fan is arranged at the bottom of the heat exchanger, and there is a pipeline connection between the fan and the heat exchanger.
[0005] In a possible implementation, the flue gas inlet of the heat exchanger is connected to the flue gas outlet of the pre-concentrator, the flue gas outlet of the heat exchanger is connected to the flue gas inlet of the absorption tower, the flue gas outlet of the absorption tower is arranged at a position above and on the opposite side of the flue gas inlet of the absorption tower, and a combustion-supporting air inlet and a combustion-supporting air outlet are provided on the heat exchanger.
[0006] In a possible implementation, the combustion air inlet is arranged at the bottom of the heat exchanger, the combustion air outlet is arranged at the top of the heat exchanger, and the combustion air inlet is connected to the blower.
[0007] In a possible implementation, the roasting furnace is arranged on the left side of the separator, the flue gas outlet at the top of the roasting furnace is connected to the flue gas inlet on the left side of the separator, and the bottom of the separator is connected to the middle part of the roasting furnace through a pipeline, and the bottom of the separator is higher than the middle position of the roasting furnace.
[0008] In a possible implementation, the pre-concentrator is arranged at a lower position on the right side of the separator, and the flue gas outlet at the top of the separator is connected to the flue gas inlet at the top of the pre-concentrator.
[0009] In a possible implementation, the separator is a double cyclone separator.
[0010] In a possible implementation, the pre-concentrator is a Venturi pre-concentrator.
[0011] In a possible implementation, the heat exchanger includes a shell, a tube bundle, tube sheets and tube clips, and the tube bundle, the tube sheets and the tube clips are all arranged inside the shell; a plurality of tubes are arranged inside the tube bundle, the tube bundle is welded to the tube sheets, and the tube bundle is welded to the tube clips.
[0012] In a possible implementation, switching valves are arranged at the bottoms of both the double cyclone separator and the roasting furnace.
[0013] In a possible implementation, the material of the heat exchanger in contact with the flue gas is graphite.
[0014] Advantages of the present utility model: By providing a roasting furnace, a separator, a pre-concentrator, a heat exchanger, an absorption tower and a fan; the roasting furnace is suitable for the thermal decomposition of pre-concentrated acid, and a spraying pipe is provided at the top of the roasting furnace, which is suitable for spraying pre-concentrated acid. When the temperature in the roasting furnace reaches 500 - 800 °C, the pre-concentrated acid sprayed by the spraying pipe is decomposed; the separator is arranged on one side of the roasting furnace, and there is a pipeline connection between the top of the roasting furnace and one side of the top of the separator. The separator separates particulate matter in the flue gas. The pre-concentrated acid vaporizes in the roasting furnace, and the flue gas enters the separator from the roasting furnace through the pipeline for further separation; the pre-concentrator is arranged on the opposite side of the separator and the roasting furnace, and there is a pipeline connection between the pre-concentrator and the separator. The pre-concentrator is used to increase the concentration of waste acid. The separated flue gas enters the pre-concentrator from the separator through the pipeline for waste acid concentration; the absorption tower is arranged on the opposite side of the pre-concentrator and the separator, and there is a pipeline connection between the absorption tower and the pre-concentrator. The flue gas in the pre-concentrator enters the absorption tower from the pre-concentrator through the pipeline. The absorption tower absorbs substances such as hydrogen chloride in the flue gas that are easily soluble in water; the heat exchanger is arranged between the pre-concentrator and the absorption tower, and the fan is arranged at the bottom of the heat exchanger, and there is a pipeline connection between the fan and the heat exchanger. To reduce the temperature of the flue gas, the heat exchanger and the fan are provided. The flue gas in the pre-concentrator enters the heat exchanger through the pipeline. The fan exchanges heat between the combustion-supporting air and the flue gas in the heat exchanger, causing the temperature of the combustion-supporting air to rise and reducing the temperature of the flue gas in the heat exchanger; through the above settings in this application, the combustion-supporting air exchanges heat with the high-temperature flue gas in the heat exchanger, causing the temperature of the combustion-supporting air to rise and reducing the heat energy loss. Brief Description of the Drawings
[0015] Figure 1 Shows a schematic structural diagram of the waste heat energy-saving device for an acid regeneration unit according to an embodiment of the present application. Detailed Embodiments
[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.
[0017] Examples of the embodiments are shown in the drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.
[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.
[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.
[0020] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", "joined", "hinged", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0021] As Figure 1 shown, the waste heat energy-saving device for the acid regeneration unit includes a roasting furnace 1, a separator 3, a pre-concentrator 5, a heat exchanger 6, an absorption tower 7, and a fan 8; the roasting furnace 1 is suitable for pre-concentrated acid heating, and a spraying pipe is provided at the top of the roasting furnace 1, which is suitable for spraying pre-concentrated acid; the separator 3 is arranged on one side of the roasting furnace 1, and there is a pipeline connection between the top of the roasting furnace 1 and one side of the top of the separator 3, and the separator 3 separates particulate matter in the flue gas; the pre-concentrator 5 is arranged on the opposite side of the separator 3 and the roasting furnace 1, and there is a pipeline 4 connection between the pre-concentrator 5 and the separator 3, and the pre-concentrator 5 treats waste acid in the flue gas; the absorption tower 7 is arranged on the opposite side of the pre-concentrator 5 and the separator 3, and there is a pipeline connection between the absorption tower 7 and the pre-concentrator 5; the heat exchanger 6 is arranged between the pre-concentrator 5 and the absorption tower 7, both the pre-concentrator 5 and the absorption tower 7 are pipeline-connected to the heat exchanger 6, and the fan 8 is arranged at the bottom of the heat exchanger 6, and there is a pipeline 9 connection between the fan 8 and the heat exchanger 6.
[0022] Specifically, the roasting furnace 1 is suitable for the thermal decomposition of pre-concentrated acid. A spraying pipe is provided at the top of the roasting furnace 1, which is suitable for spraying pre-concentrated acid. When the temperature in the roasting furnace 1 reaches 500 - 800 °C, the pre-concentrated acid sprayed by the spraying pipe is decomposed; the separator 3 is arranged on one side of the roasting furnace 1, and the top of the roasting furnace 1 is connected to one side of the top of the separator 3 through a pipeline. The separator 3 separates particulate matter in the flue gas. The pre-concentrated acid vaporizes in the roasting furnace 1, and the flue gas enters the separator 3 from the roasting furnace 1 through the pipeline for further separation; the pre-concentrator 5 is arranged on the opposite side of the separator 3 and the roasting furnace 1, and the pre-concentrator 5 is connected to the separator 3 through a pipeline. The pre-concentrator 5 is used to increase the concentration of waste acid. The separated flue gas enters the pre-concentrator 5 from the separator 3 through the pipeline, increasing the concentration of the waste acid in the pre-concentrator 5; the absorption tower 7 is arranged on the opposite side of the pre-concentrator 5 and the separator 3, and the absorption tower 7 is connected to the pre-concentrator 5 through a pipeline. The flue gas in the pre-concentrator 5 enters the absorption tower 7 from the pre-concentrator 5 through the pipeline. The absorption tower 7 absorbs substances such as hydrogen chloride that are easily soluble in water in the flue gas; the heat exchanger 6 is arranged between the pre-concentrator 5 and the absorption tower 7. Both the pre-concentrator 5 and the absorption tower 7 are connected to the heat exchanger 6 through pipelines. The pre-concentrator 5 is connected to the heat exchanger 6 through a pipeline, and a fan 8 is arranged at the bottom of the heat exchanger 6, and the fan 8 is connected to the heat exchanger 6 through a pipeline. To reduce the temperature of the flue gas, the heat exchanger 6 and the fan 8 are provided. The flue gas in the pre-concentrator 5 enters the heat exchanger 6 through the pipeline. The fan 8 exchanges heat between the combustion-supporting air and the flue gas in the heat exchanger 6, raising the temperature of the combustion-supporting air and reducing the temperature of the flue gas in the heat exchanger 6.
[0023] In a possible implementation, the flue gas inlet of the heat exchanger 6 is connected to the flue gas outlet of the pre-concentrator 5, the flue gas outlet of the heat exchanger 6 is connected to the flue gas inlet of the absorption tower 7, the flue gas outlet of the absorption tower 7 is arranged at a position above the opposite side of the flue gas inlet of the absorption tower 7, and a combustion-supporting air inlet C and a combustion-supporting air outlet D are provided on the heat exchanger 6; the combustion-supporting air inlet C is arranged at the bottom of the heat exchanger 6, the combustion-supporting air outlet D is arranged at the top of the heat exchanger 6, and the combustion-supporting air inlet is connected to the flue gas outlet of the fan 8.
[0024] Specifically, as Figure 1 shown, the flue gas in the pre-concentrator 5 enters the pipeline from the flue gas outlet of the pre-concentrator 5, enters the heat exchanger 6 through the pipeline. The flue gas inlet of the fan 8 absorbs normal-temperature combustion-supporting air, and the combustion-supporting air enters the pipeline from the flue gas outlet of the fan 8. The pipeline is connected to the combustion-supporting air inlet C and enters the heat exchanger 6 through the combustion-supporting air inlet C, exchanges heat with the high-temperature flue gas in the heat exchanger 6, raising the temperature of the combustion-supporting air. The combustion-supporting air with the increased temperature is discharged from the combustion-supporting air flue gas outlet D and is used to heat the roasting furnace 1 in cooperation with natural gas.
[0025] In a possible implementation, the roasting furnace 1 is arranged on the left side of the separator 3. The flue gas outlet at the top of the roasting furnace 1 is connected to the flue gas inlet at the top of the separator 3, and the bottom of the separator 3 is connected to the middle part of the roasting furnace 1 through a pipeline. The bottom of the separator 3 is higher than the middle position of the roasting furnace 1.
[0026] Specifically, as Figure 1 shown, after the roasting furnace 1 gasifies the pre-concentrated acid, the resulting flue gas contains some particulate matter. The gasified flue gas enters the separator 3, and the separator 3 separates the particulate matter in the flue gas from the flue gas. The separated particulate matter returns to the roasting furnace 1 through a pipeline from the bottom of the separator.
[0027] In a possible implementation, the pre-concentrator 5 is arranged at a lower position on the right side of the separator 3. The flue gas outlet at the top of the separator 3 is connected to the flue gas inlet at the top of the pre-concentrator 5; the separator 3 is a double-cyclone separator.
[0028] The double-cyclone separator separates the particulate matter in the flue gas through the action of centrifugal force to achieve the purpose of purifying the flue gas. The double-cyclone separator is composed of two or more cyclone cylinders, and each cyclone cylinder can independently perform dust removal operations, thereby improving the dust removal efficiency and throughput.
[0029] In a possible implementation, the pre-concentrator 5 is a Venturi pre-concentrator.
[0030] The Venturi pre-concentrator is selected because of its simple structure, easy manufacturing and maintenance. It uses the Venturi effect to achieve gas-liquid mixing without an additional power source, and can effectively improve the waste acid treatment efficiency.
[0031] In a possible implementation, the heat exchanger 6 includes a shell, a tube bundle, tube sheets and tube clamps. The tube bundle, tube sheets and tube clamps are all arranged inside the shell; a plurality of tubes are arranged inside the tube bundle, and the tube bundle is welded to the tube sheets, and the tube bundle is welded to the tube clamps.
[0032] In a possible implementation, switch valves are arranged at the bottom of the double-cyclone separator and the bottom of the roasting furnace 1.
[0033] Specifically, as Figure 1 shown, switch valves are arranged at the bottom of the double-cyclone separator and the bottom of the roasting furnace 1 in order to discharge the particulate matter uniformly.
[0034] This application is provided with a roasting furnace 1, a separator 3, a pre-concentrator 5, a heat exchanger 6, an absorption tower 7 and a fan 8; the roasting furnace 1 is suitable for heating pre-concentrated acid, and a spraying pipe is arranged at the top of the roasting furnace 1, which is suitable for spraying pre-concentrated acid. When the temperature in the roasting furnace 1 reaches 500 - 800 °C, the pre-concentrated acid sprayed by the spraying pipe is decomposed; the separator 3 is arranged on one side of the roasting furnace 1, and there is a pipeline connection between the top of the roasting furnace 1 and one side of the top of the separator 3. The separator 3 separates particulate matter in the flue gas. The pre-concentrated acid is vaporized in the roasting furnace 1, and the flue gas enters the separator 3 from the roasting furnace 1 through the pipeline for further separation; the pre-concentrator 5 is arranged on the opposite side of the separator 3 and the roasting furnace 1, and there is a pipeline connection between the pre-concentrator 5 and the separator 3. The pre-concentrator 5 is used to increase the concentration of waste acid. The separated flue gas enters the pre-concentrator 5 from the separator 3 through the pipeline for waste acid concentration;
[0035] The absorption tower 7 is arranged on the opposite side of the pre-concentrator 5 and the separator 3, and there is a pipeline connection between the absorption tower 7 and the pre-concentrator 5. The flue gas in the pre-concentrator 5 enters the absorption tower 7 from the pre-concentrator 5 through the pipeline. The absorption tower 7 absorbs substances such as hydrogen chloride that are easily soluble in water in the flue gas; the heat exchanger 6 is arranged between the pre-concentrator 5 and the absorption tower 7. Both the pre-concentrator 5 and the absorption tower 7 are pipeline-connected to the heat exchanger 6. There is a pipeline connection between the pre-concentrator 5 and the heat exchanger 6, and the fan 8 is arranged at the bottom of the heat exchanger 6, and there is a pipeline connection between the fan 8 and the heat exchanger 6. In order to reduce the temperature of the flue gas, the heat exchanger 6 and the fan 8 are provided. The flue gas in the pre-concentrator 5 enters the heat exchanger 6 through the pipeline. The fan 8 exchanges heat between the combustion-supporting air and the flue gas in the heat exchanger 6, so that the temperature of the combustion-supporting air rises and the temperature of the flue gas in the heat exchanger 6 is reduced; through the above settings in this application, the flue gas in the pre-concentrator 5 enters the heat exchanger 6 through the pipeline. The fan 8 exchanges heat between the combustion-supporting air and the flue gas in the heat exchanger 6. While the temperature of the combustion-supporting air rises and the heat energy loss is reduced, the temperature of the flue gas in the heat exchanger 6 is also reduced, which is convenient for the absorption tower and the washing tower to absorb flue gas such as hydrogen chloride that is easily soluble in water, so as to meet the national emission standards.
[0036] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and its concept of the present utility model, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.
Claims
1. A waste heat energy-saving device for an acid regeneration unit, characterized in that, It includes a roasting furnace, a separator, a pre-concentrator, a heat exchanger, an absorption tower and a fan; The roasting furnace is suitable for pre-concentrated acid heating, and a spraying pipe is arranged at the top of the roasting furnace, which is suitable for spraying pre-concentrated acid; The separator is arranged on one side of the roasting furnace, and there is a pipeline connection between the top of the roasting furnace and one side of the top of the separator. The separator separates particulate matter in the flue gas; The pre-concentrator is arranged on the opposite side of the separator and the roasting furnace, and there is a pipeline connection between the pre-concentrator and the separator. The pre-concentrator is used to increase the concentration of waste acid; The absorption tower is arranged on the opposite side of the pre-concentrator and the separator, and there is a pipeline connection between the absorption tower and the pre-concentrator; The heat exchanger is arranged between the pre-concentrator and the absorption tower. Both the pre-concentrator and the absorption tower are connected to the heat exchanger by pipelines. And the fan is arranged at the bottom of the heat exchanger, and there is a pipeline connection between the fan and the heat exchanger.
2. The waste heat energy-saving device for the acid regeneration unit according to claim 1, wherein, The flue gas inlet of the heat exchanger is connected to the flue gas outlet of the pre-concentrator, the flue gas outlet of the heat exchanger is connected to the flue gas inlet of the absorption tower. The flue gas outlet of the absorption tower is arranged at a position above the opposite side of the flue gas inlet of the absorption tower. And a combustion-supporting air inlet and a combustion-supporting air outlet are provided on the heat exchanger.
3. The waste heat energy-saving device for the acid regeneration unit according to claim 2, characterized in that, The combustion-supporting air inlet is arranged at the bottom of the heat exchanger, the combustion-supporting air outlet is arranged at the top of the heat exchanger, and the combustion-supporting air inlet is connected to the fan.
4. The waste heat energy-saving device for an acid regeneration unit according to any one of claims 1-3, characterized in that, The roasting furnace is arranged on the left side of the separator. The flue gas outlet at the top of the roasting furnace is connected to the flue gas inlet on the left side of the separator. And the bottom of the separator is connected to the middle part of the roasting furnace by a pipeline. The bottom of the separator is higher than the middle position of the roasting furnace.
5. The waste heat energy-saving device for an acid regeneration unit according to any one of claims 1 to 3, characterized in that, The pre-concentrator is arranged at a lower position on the right side of the separator. The flue gas outlet at the top of the separator is connected to the flue gas inlet at the top of the pre-concentrator.
6. The waste heat energy-saving device for an acid regeneration unit according to any one of claims 1 to 3, characterized in that, The separator is a double-cyclone separator.
7. The waste heat energy-saving device for an acid regeneration unit according to any one of claims 1 to 3, characterized in that, The pre-concentrator is a Venturi pre-concentrator.
8. The waste heat energy-saving device for the acid regeneration unit according to any one of claims 1-3, characterized in that, The heat exchanger includes a shell, a tube bundle, a tube sheet and a tube clamp. The tube bundle, the tube sheet and the tube clamp are all arranged inside the shell; A plurality of tubes are arranged inside the tube bundle. The tube bundle is welded to the tube sheet, and the tube bundle is welded to the tube clamp.
9. The waste heat energy-saving device for an acid regeneration unit according to claim 6, characterized in that Switch valves are arranged at the bottom of both the double-cyclone separator and the roasting furnace.
10. The waste heat energy-saving device for an acid regeneration unit according to any one of claims 1 to 3, characterized in that, The material of the heat exchanger in contact with the flue gas is graphite material.