Low-temperature flue gas waste heat recovery device in zinc smelting process
By designing a low-temperature flue gas waste heat recovery device in the zinc smelting process, using modular heat exchangers and 'Banana Bay'-shaped pipelines, the problem of low-temperature flue gas waste heat not recovered in traditional zinc smelting is solved, and the effective utilization of resources is achieved and Reduced power consumption.
Patent Information
- Application Number
- CN202420187486.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-01-25
AI Technical Summary
The waste heat of low-temperature flue gas in traditional zinc smelting processes has not been effectively recycled, resulting in waste of resources and equipment corrosion problems.
A low-temperature flue gas waste heat recovery device including a soft water replenishment unit, a high-temperature water circulation unit, a flue gas circulation unit and ash and acid leakage unit were designed. It adopts a modular heat exchanger made of jacketed graphite and a 'Banana Bay' shape pipeline. , the secondary recovery of waste heat of flue gas is achieved through circulation pumps and water replenishment pumps, and the scrubber spraying process and cooling system are abolished.
The secondary recycling and utilization of low-temperature flue gas is realized, the power consumption and water pump replenishment needs are reduced, the equipment life is extended, and the production efficiency and resource utilization are improved.
Smart Images
Figure CN222278536U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of zinc smelting, and specifically relates to a low-temperature flue gas waste heat recovery device in a zinc smelting process. Background Art
[0002] In the traditional pyrometallurgical zinc smelting process, the zinc sulfide ore is screened and ground before entering the roasting furnace. The roasting furnace bottom is blasted with air, and the combustion is maintained by self-heating. The high-temperature flue gas passes through the waste heat boiler with a flue gas temperature of about 300°C. The flue gas is then introduced into the scrubber and the flue gas temperature is reduced to about 70°C by wet spraying.
[0003] There are sulfur-containing minerals in zinc ore, which are converted into SO2 and SO3 during the roasting process in the roaster. And because the water in the zinc ore will also be carried away with the flue gas, when the flue gas drops to a certain level and reaches the acid dew point temperature, the SO2 and SO3 in the flue gas will first combine with the water in the flue gas to form sulfurous acid and sulfuric acid. Therefore, the waste heat boiler will control the temperature at 300°C before entering the scrubbing tower to clean the sulfur-containing substances in the flue gas.
[0004] Conventional waste heat recovery is basically carried out by waste heat boilers, and most of the materials used for waste heat boilers are carbon steel. Once the flue gas temperature reaches the acid dew point corrosion problem, the flue gas will rapidly corrode the heat exchange tubes and cause production accidents. Therefore, the pyrometallurgical zinc smelting process does not recover the waste heat of the 300°C flue gas, but chooses to directly discharge the low-temperature flue gas without recycling it again, which undoubtedly leads to a waste of resources.
[0005] In view of this, this application is hereby filed. Utility Model Content
[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a low-temperature flue gas waste heat recovery device in a zinc smelting process, so as to achieve the purpose of secondary recovery and utilization of the low-temperature flue gas.
[0007] In order to solve the above technical problems, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process, comprising a soft water replenishment unit, a high-temperature water circulation unit, a flue gas circulation unit and an ash and acid discharge unit;
[0008] The high-temperature water circulation unit includes a circulation pump, one end of which is connected to a steam drum via a pipeline, the other end of which is connected to a high-temperature heat exchanger via a pipeline, one side of the high-temperature heat exchanger is connected to a low-temperature heat exchanger via a pipeline, the low-temperature heat exchanger is connected to the steam drum via a pipeline, and the steam drum is respectively connected to a steam outlet and a preheating pipeline via pipelines.
[0009] Furthermore, the high-temperature heat exchanger and the low-temperature heat exchanger are in modular form, and multiple groups of heat exchangers can be connected in parallel in each system. The high-temperature heat exchanger and the low-temperature heat exchanger are both jacketed graphite heat exchangers.
[0010] Furthermore, the soft water replenishment unit includes a soft water replenishment pipe, one end of the soft water replenishment pipe is connected to a water replenishment tank, one side of the water replenishment tank is connected to a water replenishment pump, and one end of the water replenishment pump is connected to the low-temperature heat exchanger through a pipe.
[0011] Furthermore, the flue gas circulation unit comprises a roasting kiln flue gas inlet pipe, the roasting kiln flue gas inlet pipe is connected to the high-temperature heat exchanger through a pipeline, and the low-temperature heat exchanger is connected to the roasting kiln flue gas outlet pipe through a pipeline.
[0012] Furthermore, the ash and acid discharge unit includes ash and acid discharge devices, and the high-temperature heat exchanger and the low-temperature heat exchanger are connected to the ash and acid discharge devices through connecting pipes.
[0013] Furthermore, the connecting pipes between the high-temperature heat exchanger and the low-temperature heat exchanger and the ash discharge and acid discharge devices are made into a "banana bay" shape.
[0014] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.
[0015] 1. In the utility model, the high-temperature water circulation unit draws water from the drum through a circulation pump and transports it to the high-temperature heat exchanger, and then transports it to the drum to complete the high-temperature water circulation process. The high-temperature water is separated into steam and water in the drum, and the water returns to the drum. The saturated steam is transported to the pipe network. The utility model uses a high-temperature heat exchanger and a low-temperature heat exchanger to exchange heat with the flue gas, and can produce saturated steam below 1MPa pressure. The waste heat of the flue gas is recovered through this process, the washing tower spray process is cancelled, the power consumption of the water pump in the spray process and the water replenishment in the spray acid are reduced, the waste heat of the flue gas is recovered through this process, the original cooling process of the spray acid is cancelled, and the power consumption and water replenishment of the cooling system are reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:
[0017] Figure 1 The diagram is a structural diagram of a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0018] Numbers in the figure:
[0019] 11. Soft water supply pipe; 12. Water supply tank; 13. Water supply pump;
[0020] 21. Circulation pump; 22. Steam drum; 23. High-temperature heat exchanger; 24. Low-temperature heat exchanger; 25. Steam outlet; 26. Preheating pipeline;
[0021] 31. Roasting kiln smoke inlet pipe; 32. Roasting kiln smoke outlet pipe;
[0022] 4. Ash and acid discharge devices.
[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.
[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] like Figure 1 As shown, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0028] Specifically, by Figure 1 It includes a soft water replenishment unit, a high temperature water circulation unit, a flue gas circulation unit and an ash and acid discharge unit;
[0029] The high-temperature water circulation unit includes a circulation pump 21, one end of the circulation pump 21 is connected to a steam drum 22 through a pipeline, the other end of the circulation pump 21 is connected to a high-temperature heat exchanger 23 through a pipeline, one side of the high-temperature heat exchanger 23 is connected to a low-temperature heat exchanger 24 through a pipeline, the low-temperature heat exchanger 24 is connected to the steam drum 22 through a pipeline, and the steam drum 22 is respectively connected to a steam outlet 25 and a preheating pipeline 26 through pipelines.
[0030] It should be noted that the steam drum 22 is the connecting hub of the three processes of heating, evaporation and superheating in the utility model. The steam drum 22 contains a certain amount of water and thus has a certain heat storage capacity. When the load changes, the speed of change of the steam pressure can be slowed down.
[0031] Preferably, the number of the circulation pumps 21 is two.
[0032] In the utility model, water is pumped from the drum 22 by the circulating pump 21 and transported to the high-temperature heat exchanger 23, and then transported to the drum 22 to complete the high-temperature water circulation process. The high-temperature water is separated into steam and water in the drum 22, and the water returns to the drum 22. The saturated steam is transported to the pipe network, and the high-temperature heat exchanger 23 cooperates with the low-temperature heat exchanger 24 to exchange heat with the flue gas, so as to produce saturated steam below 1MPa pressure. The waste heat of the flue gas is recovered by this process, the washing tower spraying process is cancelled, the power consumption of the water pump in the spraying process and the water replenishment in the spraying acid are reduced, and the waste heat of the flue gas is recovered by this process, the original cooling process of the spraying acid is cancelled, and the power consumption and water replenishment of the cooling system are reduced.
[0033] Furthermore, as a specific implementation of the utility model, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0034] Specifically, Figure 1 As shown, the high-temperature heat exchanger 23 and the low-temperature heat exchanger 24 are in modular form, and multiple groups of heat exchangers can be connected in parallel in each system. The high-temperature heat exchanger 23 and the low-temperature heat exchanger 24 are both jacketed graphite heat exchangers.
[0035] In the present invention, the high temperature heat exchanger 23 and the low temperature heat exchanger 24 are arranged in a modular form, so that the whole system can be easily operated and replaced. The modular heat exchanger allows the system to be flexibly configured according to actual needs. According to the specific needs of waste heat recovery, a suitable number of heat exchangers can be selected for combination to meet different process conditions and production requirements. At the same time, when the production scale is expanded or the process requirements are improved, the capacity of the whole waste heat recovery system can be expanded by increasing the number of parallel heat exchangers. This scalability enables the system to adapt to changing production needs and improve equipment utilization and production efficiency.
[0036] Furthermore, as another specific implementation of the utility model, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0037] Specifically, Figure 1 As shown, the soft water replenishment unit includes a soft water replenishment pipe 11, one end of the soft water replenishment pipe 11 is connected to a replenishment tank 12, one side of the replenishment tank 12 is connected to a replenishment pump 13, and one end of the replenishment pump 13 is connected to the low-temperature heat exchanger 24 through a pipe.
[0038] Preferably, the number of the water replenishment pumps 13 is two.
[0039] In the utility model, the soft water is delivered to the water supply tank 12 through the soft water supply pipe 11, delivered to the low-temperature heat exchanger 24 through the water supply pump 13, and then delivered to the steam drum 22. This arrangement facilitates timely replenishment of water to the low-temperature heat exchanger 24.
[0040] Furthermore, as another specific implementation of the utility model, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0041] Specifically, Figure 1 As shown, the flue gas circulation unit includes a roasting kiln flue gas inlet pipe 31, the roasting kiln flue gas inlet pipe 31 is connected to the high-temperature heat exchanger 23 through a pipeline, and the low-temperature heat exchanger 24 is connected to the roasting kiln flue gas outlet pipe 32 through a pipeline.
[0042] In the utility model, the unit introduces the roasting kiln smoke into the high-temperature heat exchanger 23 through the roasting kiln smoke inlet pipe 31, then introduces it into the low-temperature heat exchanger 24 through the pipeline, and then introduces it into the original system through the roasting kiln smoke outlet pipe 32 to complete the smoke circulation process.
[0043] Furthermore, as another specific implementation of the utility model, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0044] Specifically, Figure 1 As shown, the ash and acid discharge unit includes an ash and acid discharge device 4, and the high-temperature heat exchanger 23 and the low-temperature heat exchanger 24 are both connected to the ash and acid discharge device 4 through connecting pipes.
[0045] It should be noted that the ash discharge and acid discharge device 4 is composed of ash discharge equipment and acid discharge equipment;
[0046] Among them, the ash discharge equipment is mainly used to discharge solid particles, such as dust, coal ash, etc. The equipment consists of a collection tank or dust collector, which can collect the solid particles generated in the production process and then discharge them to a designated location through a pipe or discharge port. The ash discharge equipment can effectively reduce the emission of pollutants in the air;
[0047] Acid discharge equipment is mainly used to discharge acidic liquids, such as sulfuric acid, hydrochloric acid, etc. The equipment consists of an acid tank and a discharge port. It can collect the acidic liquids generated in the production process and then discharge them to the designated location through a pipeline or a discharge port. The acid discharge equipment can effectively reduce corrosion to the environment and equipment.
[0048] In the utility model, the unit can remove the acid and dust in the flue gas once, and the removed acid is stored in the ash and acid discharge device 4 and is regularly cleared and transported.
[0049] Furthermore, as another specific implementation of the utility model, the utility model provides a low-temperature flue gas waste heat recovery device in a zinc smelting process.
[0050] Specifically, Figure 1 As shown, the connecting pipes between the high-temperature heat exchanger 23 and the low-temperature heat exchanger 24 and the ash discharge and acid discharge device 4 are made into a "banana bay" shape.
[0051] In the utility model, the connecting pipe is made into a "banana bay" shape, which can better distribute the stress in the pipe, increase the strength and rigidity of the pipe, and improve the service life of the pipe. Secondly, the "banana bay" design can change the speed and direction of the fluid, reduce the turbulence and eddy current of the fluid, thereby optimizing the fluid dynamics performance, which can help reduce the energy loss and friction resistance in the fluid transportation process and improve the transportation efficiency.
[0052] Working principle: Through the soft water replenishment unit, the external soft water is sent to the water replenishment tank 12 through the soft water replenishment pipeline 11, and then transported to the low-temperature heat exchanger 24 through the water replenishment pump 13, and then transported to the steam drum 22;
[0053] The high-temperature water circulation unit pumps water from the drum 22 to the high-temperature heat exchanger 23 through the circulation pump 21, and then transports it to the drum 22 to complete the high-temperature water circulation process. The high-temperature water is separated into steam and water in the drum 22, and the water returns to the drum 22, and the saturated steam is transported to the pipe network;
[0054] The flue gas circulation unit introduces the roasting kiln flue gas into the high-temperature heat exchanger 23 through the roasting kiln flue gas inlet pipe 31, then introduces it into the low-temperature heat exchanger 24 through the pipeline, and then introduces it into the original system through the pipeline to complete the flue gas circulation process;
[0055] The ash and acid discharge unit is connected through a pipe between the low-temperature heat exchanger 24 and the high-temperature heat exchanger 23. The pipe is made into a "banana bay" shape. Relying on the inertia and gravity factors generated by the flue gas itself when it flows, the acid and dust in the flue gas are removed once. The removed acid is stored in the ash and acid discharge device 4 and is cleaned and transported regularly.
[0056] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.
Claims
1. A low-temperature flue gas waste heat recovery device in a zinc smelting process, characterized in that: It includes soft water replenishment unit, high temperature water circulation unit, flue gas circulation unit and ash and acid discharge unit; The high-temperature water circulation unit comprises a circulation pump (21), one end of the circulation pump (21) is connected to a steam drum (22) via a pipeline, the other end of the circulation pump (21) is connected to a high-temperature heat exchanger (23) via a pipeline, one side of the high-temperature heat exchanger (23) is connected to a low-temperature heat exchanger (24) via a pipeline, the low-temperature heat exchanger (24) is connected to the steam drum (22) via a pipeline, and the steam drum (22) is respectively connected to a steam outlet (25) and a preheating pipeline (26) via pipelines.
2. The low-temperature flue gas waste heat recovery device in a zinc smelting process according to claim 1, characterized in that: The high-temperature heat exchanger (23) and the low-temperature heat exchanger (24) are modularized, and multiple groups of heat exchangers can be connected in parallel in each system. The high-temperature heat exchanger (23) and the low-temperature heat exchanger (24) are both jacketed graphite heat exchangers.
3. The low-temperature flue gas waste heat recovery device in a zinc smelting process according to claim 1 is characterized in that: The soft water replenishment unit comprises a soft water replenishment pipe (11), one end of the soft water replenishment pipe (11) is connected to a replenishment tank (12), one side of the replenishment tank (12) is connected to a replenishment pump (13), and one end of the replenishment pump (13) is connected to a low-temperature heat exchanger (24) via a pipe.
4. The low-temperature flue gas waste heat recovery device in a zinc smelting process according to claim 1, characterized in that: The flue gas circulation unit comprises a roasting kiln flue gas inlet pipe (31), the roasting kiln flue gas inlet pipe (31) is connected to a high-temperature heat exchanger (23) through a pipeline, and the low-temperature heat exchanger (24) is connected to a roasting kiln flue gas outlet pipe (32) through a pipeline.
5. The low-temperature flue gas waste heat recovery device in a zinc smelting process according to claim 1, characterized in that: The ash and acid discharge unit comprises an ash and acid discharge device (4), and the high-temperature heat exchanger (23) and the low-temperature heat exchanger (24) are both connected to the ash and acid discharge device (4) via connecting pipes.