Waste heat recovery device for pyrite acid-making dry absorption section

Abstract

The utility model discloses a waste heat recovery device for a pyrite acid making dry absorption section, and relates to the technical field of pyrite acid making. The waste heat recovery device comprises a first waste heat recovery box and a second waste heat recovery box, wherein a first heating pipeline and a second heating pipeline are respectively arranged in the first waste heat recovery box and the second waste heat recovery box; the first waste heat recovery box is used for preparing additional steam, and the second waste heat recovery box is used for preheating liquid to be used. According to the waste heat recovery device, high-heat gas is conveyed through the first heating pipeline and the second heating pipeline, corresponding heat conduction is completed, heat can be transmitted to liquid in the two waste heat recovery boxes, and waste heat recovery is achieved; the first waste heat recovery box produces steam, and the second box preheats liquid, so that the energy utilization rate is increased, and the cost is reduced; the device is compact in structure, convenient to install and maintain and easy to operate, and liquid can be automatically supplemented through the water supply assembly.

Description

Technical Field

[0001] This utility model belongs to the field of sulfuric acid production technology based on pyrite, and in particular relates to a waste heat recovery device for the dry absorption section of sulfuric acid production based on pyrite. Background Technology

[0002] In the production process of sulfuric acid from pyrite, the dry absorption section generates a large amount of high-heat gas. This gas typically carries significant thermal energy; direct emission would not only waste energy but also potentially cause thermal pollution. Traditional treatment methods often fail to fully utilize this waste heat, resulting in low energy efficiency. With rising energy costs and increasingly stringent environmental regulations, effectively recovering and utilizing this waste heat has become a pressing issue for the pyrite-based sulfuric acid industry.

[0003] Currently, although there are some waste heat recovery devices on the market, most of them have problems such as complex structure, inconvenient operation, and low recovery efficiency. Some devices can only achieve single-function waste heat recovery, such as only for preheating or only for steam preparation, which cannot meet the diverse waste heat recovery needs in the acid production process and reduce energy utilization efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery device for the dry absorption section of pyrite-based acid production. In this invention, the waste heat recovery device transports high-heat gas through first and second heating pipes and completes the corresponding heat conduction, which can transfer heat to the liquid in the two waste heat recovery tanks, thus realizing waste heat recovery. The first waste heat recovery tank generates steam, and the second tank preheats the liquid, improving energy utilization and reducing costs. The device has a compact structure, and the water supply component enables automatic liquid replenishment. It is easy to install and maintain, and simple to operate, solving existing technical problems.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] A waste heat recovery device for the dry absorption section of pyrite-to-acid production line includes:

[0007] A first waste heat recovery box and a second waste heat recovery box are respectively equipped with a first heating pipe and a second heating pipe inside the first waste heat recovery box and the second waste heat recovery box are respectively used to generate additional steam; the first waste heat recovery box is used to preheat the liquid to be used.

[0008] It also includes a steam exhaust pipe and a water injection pipe. The steam exhaust pipe is fixedly inserted through the top of the first waste heat recovery tank and is used to exhaust the steam generated in the first waste heat recovery tank. The water injection pipe is fixedly inserted through the top of the second waste heat recovery tank and is used to inject water into the second waste heat recovery tank.

[0009] It also includes a water supply component, which includes a water supply pipe and a water pump. The water pump is fixedly installed on the water supply pipe. The water supply component is used to replenish the evaporation water in the first waste heat recovery tank.

[0010] Optionally, an air inlet pipe is fixedly connected to one side of the first waste heat recovery box. The air inlet pipe is used to input high-heat gas. One end of the air inlet pipe is fixedly connected to one end of the first heating pipe. The first heating pipe is fixedly installed inside the first waste heat recovery box. The other end of the first heating pipe is fixedly connected to a first fixing pipe. One end of the first fixing pipe is fixedly connected to one side of the first waste heat recovery box. An air outlet pipe is fixedly connected to one end of the second waste heat recovery box. The air outlet pipe is used to discharge the high-heat gas flowing through the first heating pipe and the second heating pipe. The air outlet pipe is fixedly connected to one end of the second heating pipe. The other end of the second heating pipe is fixedly installed with a second fixing pipe. One end of the second fixing pipe is fixedly connected to one side of the second waste heat recovery box. A common connecting pipe is fixedly installed between the first fixing pipe and the second fixing pipe to complete the connection between the first heating pipe and the second heating pipe.

[0011] Optionally, the first heating pipe and the second heating pipe have the same structure, both consisting of a straight heating pipe and a spiral heating pipe. The straight heating pipe is located inside the spiral heating pipe and is connected to the spiral heating pipe to ensure that it can fully heat the liquid inside the corresponding waste heat recovery tank.

[0012] Optionally, the water supply assembly includes a drain pipe fixedly penetrating one side of the second waste heat recovery tank. The drain pipe is used to discharge the preheated water to be used in the second waste heat recovery tank. One end of the water supply pipe is fixedly connected to the outer wall of the drain pipe and communicates with the drain pipe. The other end of the water supply pipe is fixedly penetrating one side of the first waste heat recovery tank. The water supply pipe cooperates with a water pump to pump water from the second waste heat recovery tank to the first waste heat recovery tank when needed. A solenoid valve is fixedly installed at the end of the water supply pipe near the drain pipe. The solenoid valve is used to close the water supply pipe.

[0013] Optionally, a mounting bracket is fixedly installed through one side of the first waste heat recovery box. The mounting bracket is located near the bottom inner wall of the first waste heat recovery box. A liquid level sensor is fixedly installed at one end of the mounting bracket. The liquid level sensor is located inside the first waste heat recovery box and is used to detect the water level inside the first waste heat recovery box. The liquid level sensor is electrically connected to a water pump and a solenoid valve.

[0014] Optionally, a filter pipe is fixedly installed at one end of the air intake pipe, and a filter screen is provided inside the filter pipe. The filter pipe is used to filter the high-heat gas that is about to flow through the first heating pipe and the second heating pipe.

[0015] The embodiments of this utility model have the following beneficial effects:

[0016] In this invention, high-heat gas is transported and conducted through the first and second heating pipes, which can transfer the heat contained therein to the liquid in the first and second waste heat recovery tanks, thus realizing the recovery and utilization of waste heat. The first waste heat recovery tank is used to generate additional steam, and the second waste heat recovery tank is used to preheat the liquid to be used, thereby improving energy utilization efficiency and reducing production costs.

[0017] In this utility model, the overall structure of the device is compact, the connections between the components are reasonable, and it is easy to install and maintain; the water supply component realizes the circulation and replenishment of liquid, and the cooperation of the liquid level sensor and the solenoid valve realizes the automatic control of the water level in the first waste heat recovery tank, which is simple and convenient to operate.

[0018] In this invention, the first heating pipe and the second heating pipe adopt a structure combining a straight heating pipe and a spiral heating pipe, which allows for sufficient heat exchange between the high-heat gas and the liquid in the pipe, thereby improving the heat recovery efficiency. At the same time, by performing corresponding heat recovery operations on high-heat gases at different temperatures, the gradient recovery and utilization of waste heat is effectively achieved, thereby improving the waste heat recovery and utilization rate.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. 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.

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0022] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a heating pipe structure according to an embodiment of the present invention.

[0025] In the diagram: 1. First waste heat recovery box; 2. Second waste heat recovery box; 3. Support frame; 4. Inlet pipe; 5. Outlet pipe; 6. First heating pipe; 7. Second heating pipe; 8. First fixed pipe; 9. Second fixed pipe; 10. Connecting pipe; 11. Filter pipe; 12. Steam exhaust pipe; 13. Water injection pipe; 14. Drain pipe; 15. Water supply pipe; 16. Water pump; 17. Solenoid valve; 18. Heating straight pipe; 19. Spiral heating pipe; 20. Mounting bracket; 21. Liquid level sensor. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements 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 utility model.

[0028] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0029] Example 1: Please refer to Figure 1-4 As shown, this embodiment provides a waste heat recovery device, mainly composed of a first waste heat recovery tank 1, a second waste heat recovery tank 2, a steam exhaust pipe 12, a water injection pipe 13, a water supply assembly, and corresponding gas pipelines. The first waste heat recovery tank 1 is used for the preparation of additional steam, and the second waste heat recovery tank 2 is used for the preheating of the liquid to be used.

[0030] In this embodiment, a first heating pipe 6 and a second heating pipe 7 are respectively installed inside the first waste heat recovery box 1 and the second waste heat recovery box 2. An air inlet pipe 4 is fixedly installed through one side of the first waste heat recovery box 1, for inputting high-heat gas. One end of the air inlet pipe 4 is fixedly connected to one end of the first heating pipe 6, which is fixedly installed inside the first waste heat recovery box 1. A first fixing pipe 8 is fixedly connected to the other end of the first heating pipe 6, and one end of the first fixing pipe 8 is fixedly installed through one side of the first waste heat recovery box 1. An air outlet pipe 5 is fixedly installed through one end of the second waste heat recovery box 2, for discharging the high-heat gas flowing through the first heating pipe 6 and the second heating pipe 7. The air outlet pipe 5 is fixedly connected to one end of the second heating pipe 7, and a second fixing pipe 9 is fixedly installed at the other end of the second heating pipe 7, with one end of the second fixing pipe 9 fixedly installed through one side of the second waste heat recovery box 2. A common connecting pipe 10 is fixedly installed between the first fixing pipe 8 and the second fixing pipe 9, thereby completing the connection between the first heating pipe 6 and the second heating pipe 7.

[0031] In this embodiment, the first heating pipe 6 and the second heating pipe 7 have the same structure, both consisting of a straight heating pipe 18 and a spiral heating pipe 19. The straight heating pipe 18 is located inside the spiral heating pipe 19, and one end of the straight heating pipe 18 is connected to one end of the spiral heating pipe 19. This structural design ensures that the liquid inside the corresponding waste heat recovery tank is fully heated when the high-heat gas flows inside the pipe. Furthermore, both the first heating pipe 6 and the second heating pipe 7 are made of materials with good thermal conductivity.

[0032] In this embodiment, the steam discharge pipe 12 is fixedly inserted through the top of the first waste heat recovery tank 1, and its function is to discharge the steam generated in the first waste heat recovery tank 1. The water injection pipe 13 is fixedly inserted through the top of the second waste heat recovery tank 2, and is used to inject water into the second waste heat recovery tank 2.

[0033] In this embodiment, the water supply assembly includes a water supply pipe 15, a water pump 16, a drain pipe 14, and a solenoid valve 17. The drain pipe 14 is fixedly inserted through one side of the second waste heat recovery tank 2 and is used to discharge the preheated water to be used in the second waste heat recovery tank 2. One end of the water supply pipe 15 is fixedly connected to the outer wall of the drain pipe 14 and communicates with the drain pipe 14, while the other end of the water supply pipe 15 is fixedly inserted through one side of the first waste heat recovery tank 1. The water supply pipe 15 is divided into two sections, and the water pump 16 is located between the two sections of the water supply pipe 15. One end of each section of the water supply pipe 15 is fixedly connected to the inlet and outlet of the water pump 16, respectively. The water supply pipe 15 and the water pump 16 cooperate to pump water from the second waste heat recovery tank 2 to the first waste heat recovery tank 1 when needed. A solenoid valve 17 is fixedly installed at the end of the water supply pipe 15 near the drain pipe 14 to close the water supply pipe 15.

[0034] In this embodiment, a mounting bracket 20 is fixedly installed through one side of the first waste heat recovery tank 1. The mounting bracket 20 is located near the bottom inner wall of the first waste heat recovery tank 1. A liquid level sensor 21 is fixedly installed at one end of the mounting bracket 20. The liquid level sensor 21 is located inside the first waste heat recovery tank 1 and its function is to detect the water level inside the first waste heat recovery tank 1. The liquid level sensor 21 is electrically connected to the water pump 16 and the solenoid valve 17. When the water level in the first waste heat recovery tank 1 is lower than a set value, the liquid level sensor 21 will send a signal to start the water pump 16 and open the solenoid valve 17, so that water in the second waste heat recovery tank 2 can be pumped into the first waste heat recovery tank 1.

[0035] This application can be used in the field of sulfuric acid production from pyrite, or in other fields applicable to this application.

[0036] Example 2: Reference Figure 1 , 2 An improvement based on Example 1: a waste heat recovery device for the dry absorption section of pyrite-to-acid production, which is applied to the field of pyrite-to-acid production technology.

[0037] In this embodiment, the bottom of the first waste heat recovery box 1 and the second waste heat recovery box 2 are both fixedly installed with corresponding support frames 3 to facilitate the installation and fixation of the first waste heat recovery box 1 and the second waste heat recovery box 2.

[0038] In this embodiment, an external controller is provided for receiving the signal from level sensor 21. This controller is electrically connected to water pump 16 and solenoid valve 17, and can also control water pump 16 and solenoid valve 17. The controller has a built-in time relay to ensure that water pump 16 and solenoid valve 17 automatically close after being turned on for a period of time. Both the controller and level sensor 21 are the same as those in announcement number CN222733428U, and the time relay is the same as those in announcement number CN222731578U.

[0039] In this embodiment, a filter pipe 11 is fixedly installed at one end of the air inlet pipe 4. The filter pipe 11 is equipped with a filter screen, which is used to filter the high-heat gas that is about to flow through the first heating pipe 6 and the second heating pipe 7, so as to prevent impurities in the gas from entering the pipe and affecting the heating effect and normal operation of the device.

[0040] However, as is well known to those skilled in the art, the working principles and wiring methods of the water pump 16 and the solenoid valve 17 are commonplace and are conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0041] The usage process and working principle of this utility model technical solution are as follows:

[0042] During use, the high-heat gas emitted during acid production first enters the filter pipe for filtration through a connected pipe, and then flows sequentially through the first heating pipe 6 and the second heating pipe 7 via the inlet pipe 4. During this flow, the high-heat gas transfers heat to the liquids in the first waste heat recovery tank 1 and the second waste heat recovery tank 2, achieving heat recovery and utilization. The high-heat gas initially has a high heat value; as it flows through the first heating pipe 6, the liquid in the first waste heat recovery tank 1 absorbs heat and generates steam. The steam is discharged through the steam outlet pipe 12 and can be used in other production processes. After initial heat recovery, the temperature of the high-heat gas decreases, and it then enters the second heating pipe 7. The second waste heat recovery tank 2 is continuously replenished with liquid to be used through the water injection pipe 13. The high-heat gas entering the second heating pipe 7 can further treat the corresponding liquids in the second waste heat recovery tank 2. The liquid is preheated and discharged through drain pipe 14, and can be used in subsequent processes as needed. When the water level in the first waste heat recovery tank 1 is lower than the set value, the liquid level sensor 21 will send a signal. At this time, the controller can control the water pump 16 to start and the solenoid valve 17 to open. The water in the second waste heat recovery tank 2 will be pumped to the first waste heat recovery tank 1 through the water supply pipe 15 to replenish the evaporation water in the first waste heat recovery tank 1. The controller is equipped with a time relay to ensure that the water pump 16 and the solenoid valve 17 stop working and close after working for a fixed period of time. At this time, the evaporation water in the first waste heat recovery tank 1 is replenished accordingly, which can ensure the stable operation of heat recovery. Through the above structure and working process, the waste heat recovery device can effectively recover and utilize the waste heat generated in the acid production process, improve energy utilization efficiency, and reduce production costs.

[0043] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0044] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pyrite-based acid-making dry absorption section waste heat recovery device, characterized in that, include: The first waste heat recovery box (1) and the second waste heat recovery box (2) are respectively provided with a first heating pipe (6) and a second heating pipe (7); the first waste heat recovery box (1) is used to prepare additional steam, and the second waste heat recovery box (2) is used to preheat the liquid to be used. It also includes a steam exhaust pipe (12) and a water injection pipe (13). The steam exhaust pipe (12) is fixedly inserted through the top of the first waste heat recovery box (1) and is used to exhaust the steam generated in the first waste heat recovery box (1). The water injection pipe (13) is fixedly inserted through the top of the second waste heat recovery box (2) and is used to inject water into the second waste heat recovery box (2). It also includes a water supply component, which includes a water supply pipe (15) and a water pump (16). The water pump (16) is fixedly installed on the water supply pipe (15). The water supply component is used to replenish the evaporation water in the first waste heat recovery tank (1).

2. A pyrite-based acid dry absorption section waste heat recovery device according to claim 1, characterized in that, An air inlet pipe (4) is fixedly inserted through one side of the first waste heat recovery box (1). The air inlet pipe (4) is used for inputting high-heat gas. One end of the air inlet pipe (4) is fixedly connected to one end of the first heating pipe (6). The first heating pipe (6) is fixedly installed inside the first waste heat recovery box (1). The other end of the first heating pipe (6) is fixedly connected to a first fixing pipe (8). One end of the first fixing pipe (8) is fixedly inserted through one side of the first waste heat recovery box (1). An air outlet pipe (5) is fixedly inserted through one end of the second waste heat recovery box (2). The exhaust pipe (5) is used to discharge the high-heat gas flowing through the first heating pipe (6) and the second heating pipe (7). The exhaust pipe (5) is fixedly connected to one end of the second heating pipe (7). The other end of the second heating pipe (7) is fixedly installed with a second fixed pipe (9). One end of the second fixed pipe (9) is fixedly inserted through one side of the second waste heat recovery box (2). The same connecting pipe (10) is fixedly installed between the first fixed pipe (8) and the second fixed pipe (9) to complete the connection between the first heating pipe (6) and the second heating pipe (7).

3. A pyrite-based acid dry absorption section waste heat recovery device according to claim 2, characterized in that, The first heating pipe (6) and the second heating pipe (7) have the same structure. They are both composed of a heating straight pipe (18) and a spiral heating pipe (19). The heating straight pipe (18) is located inside the spiral heating pipe (19). The heating straight pipe (18) is connected to the spiral heating pipe (19) to ensure that it can fully heat the liquid inside the corresponding waste heat recovery tank.

4. The waste heat recovery device for the dry absorption section of pyrite-to-acid production as described in claim 1, characterized in that, The water supply assembly includes a drain pipe (14) fixedly penetrating one side of the second waste heat recovery tank (2). The drain pipe (14) is used to discharge the preheated water to be used in the second waste heat recovery tank (2). One end of the water supply pipe (15) is fixedly connected to the outer wall of the drain pipe (14) and communicates with the drain pipe (14). The other end of the water supply pipe (15) is fixedly penetrating one side of the first waste heat recovery tank (1). The water supply pipe (15) cooperates with the water pump (16) to pump the water in the second waste heat recovery tank (2) to the first waste heat recovery tank (1) when needed. A solenoid valve (17) is fixedly installed at one end of the water supply pipe (15) near the drain pipe (14). The solenoid valve (17) is used to close the water supply pipe (15).

5. A pyrite-based acid dry absorption section waste heat recovery device according to claim 1, characterized in that, A mounting bracket (20) is fixedly installed through one side of the first waste heat recovery box (1). The mounting bracket (20) is located near the bottom inner wall of the first waste heat recovery box (1). A liquid level sensor (21) is fixedly installed at one end of the mounting bracket (20). The liquid level sensor (21) is located inside the first waste heat recovery box (1). The liquid level sensor (21) is used to detect the water level in the first waste heat recovery box (1). The liquid level sensor (21) is electrically connected to the water pump (16) and the solenoid valve (17).

6. A pyrite-based acid dry absorption section waste heat recovery device as claimed in claim 2, characterized in that, A filter pipe (11) is fixedly installed at one end of the air inlet pipe (4). The filter pipe (11) is equipped with a filter screen inside. The filter pipe (11) is used to filter the high-heat gas that is about to flow through the first heating pipe (6) and the second heating pipe (7).

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