High-temperature liquid slag granulation and waste heat recovery system device

Abstract

The utility model discloses a high-temperature liquid slag granulation and waste heat recovery system device which comprises a granulation furnace, a granulation cooling assembly and a waste heat recovery assembly, and the granulation cooling assembly comprises a liquid cooling granulation element and an air granulation element. The air granulation element can be communicated with high-pressure air flow and is provided with an air flow jet orifice facing the containing space, and the liquid cooling granulation element can be communicated with cooling water and is provided with a liquid flow jet orifice facing the containing space. According to the high-temperature liquid slag granulation and waste heat recovery system device provided by the utility model, the air granulation element and the liquid cooling element are combined to jointly carry out granulation treatment and cooling treatment on liquid slag, so that the cooling speed and the cooling effect of the granulated slag are improved; and meanwhile, heat in high-temperature water and high-temperature steam generated in the granulating furnace is recovered, so that energy can be fully utilized in the later period, high-quality waste heat is effectively recovered, the production cost is reduced, the energy consumption is reduced, and great benefits are brought to economic benefits.

Description

Technical Field

[0001] This utility model belongs to the field of slag recycling technology, and particularly relates to the granulation and waste heat recovery of high-temperature liquid slag. Background Technology

[0002] With the development of the non-ferrous metals and metallurgical industries, the amount of slag discharged is increasing. High-temperature slag is waste residue discharged from the furnace during metal smelting and is a byproduct of the smelting process. Due to the backwardness of my country's slag recycling technology, only a small portion is used for cement and road construction, while most is used for landfill. Therefore, it not only occupies a large amount of land resources but also pollutes the environment.

[0003] Slag granulation is one of the effective methods to improve the stability of high-temperature slag. Its basic principle is that liquid slag is poured into a slag trough and flows evenly into a granulator, where it is thrown out tangentially, thus forming slag particles with better stability. Slag granulation requires less investment, occupies less space, has good environmental performance, and the granulated slag has a small particle size, less free calcium oxide and magnesium oxide, and good stability, which is beneficial for waste slag recycling.

[0004] The annual output of high-temperature slag is hundreds of millions of tons, and it is a high-quality waste heat resource. In terms of quality, the sensible heat of slag has a high energy value; in terms of quantity, the energy that can be recovered is also enormous. Therefore, if the waste energy of high-temperature slag can be recovered and reused, a large amount of resources can be saved.

[0005] Granulation of liquid blast furnace slag is of great significance for the reuse of solid waste such as blast furnace slag and the recovery of sensible heat from liquid blast furnace slag. It is essential to study a liquid blast furnace slag granulation and waste heat recovery system device with good granulation effect, simple structure and high reliability. Utility Model Content

[0006] The purpose of this invention is to provide a high-temperature liquid slag granulation and waste heat recovery system to solve the problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides a high-temperature liquid slag granulation and waste heat recovery system device, comprising:

[0008] A granulation furnace, wherein the granulation furnace has an internal containment space that is in communication with high-temperature liquid slag;

[0009] A granulation cooling assembly is disposed inside the granulation furnace. The granulation cooling assembly includes a liquid-cooled granulation element and an air granulation element. The air granulation element is connected to a high-pressure airflow and has an airflow injection port facing the containment space. The liquid-cooled granulation element is connected to cooling water and has a liquid flow injection port facing the containment space.

[0010] The waste heat recovery assembly includes a liquid phase waste heat recovery element and a vapor phase waste heat recovery element. The vapor phase waste heat recovery element is connected to the upper part of the containing space, and the liquid phase waste heat recovery element is connected to the bottom of the containing space.

[0011] Optionally, the liquid-cooled granulation element is a plurality of nozzles disposed in the granulation furnace, and the nozzles are provided with a plurality of liquid flow injection ports.

[0012] Optionally, a feed inlet is provided at the top center of the granulation furnace, and the feed inlet is connected to the receiving space; all the nozzles are arranged on the inner wall of the granulation furnace, and the liquid jet nozzles on the nozzles are arranged facing the feed inlet.

[0013] Optionally, the air granulation element is a high-pressure air nozzle, and the high-pressure air nozzle has a plurality of airflow injection ports.

[0014] Optionally, a feed inlet is provided at the top center of the granulation furnace, and the feed inlet is in communication with the accommodating space; the high-pressure air nozzle is located directly below the feed inlet, and the feed inlet and the high-pressure air nozzle are arranged coaxially and collinearly.

[0015] Optionally, the liquid phase waste heat recovery element is a phase change accumulator, which is connected to the bottom of the granulation furnace.

[0016] Optionally, the granulation furnace is provided with a discharge port at the bottom, and a water filtration assembly is provided inside the granulation furnace. The water filtration assembly is located above the discharge port. The discharge port includes a high-temperature water discharge port and a granulation furnace slag discharge port. The high-temperature water discharge port is connected to a phase change heat accumulator.

[0017] Optionally, a circulating water system is connected between the liquid-cooled granulation element and the phase change accumulator, and the circulating water system is used to supply water cooled by the phase change accumulator to the liquid-cooled granulation element.

[0018] Optionally, the vapor phase waste heat recovery element is a plurality of steam accumulators, which are connected to the top of the granulation furnace.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] When using the high-temperature liquid slag granulation and waste heat recovery system device provided by this utility model, the granulation furnace's containment space is connected to the high-temperature liquid slag, allowing the slag to enter the containment space. The air granulation element is connected to the high-pressure airflow, which injects high-pressure airflow into the containment space. Simultaneously, cooling water is connected to the liquid-cooled granulation element, which injects cooling water into the containment space. The high-temperature liquid slag is granulated under the combined action of the cooling water injection and the high-pressure airflow. Simultaneously, the cooling water and high-pressure airflow cool the granulated liquid slag. Since the cooling water rapidly vaporizes upon contact with the high-temperature liquid slag, the high-temperature vapor rises within the containment space and enters the containment space. In the interconnected vapor phase waste heat recovery element, high-temperature steam is recovered through the vapor phase waste heat recovery element, while the high-temperature water that has not been vaporized after heat exchange with the high-temperature liquid slag falls to the bottom of the containing space under its own weight, and the liquid medium is recovered through the liquid phase waste heat recovery element connected to the bottom of the containing space. It can be seen that the high-temperature liquid slag granulation and waste heat recovery system device provided by this utility model combines air granulation element and liquid cooling element to perform granulation and cooling treatment on liquid slag, improve the cooling speed and cooling effect of granulated slag, and recover the heat from the high-temperature water and high-temperature steam generated in the granulation furnace, which can reduce production costs and energy consumption, thus greatly benefiting economic benefits. Attached Figure Description

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the high-temperature liquid slag granulation and waste heat recovery system of this utility model;

[0023] Figure 2 This is a schematic diagram of the water filtration component of this utility model.

[0024] The components include: 1. feed inlet, 2. nozzle, 3. high-pressure air nozzle, 4. water filter assembly, 5. granulation furnace, 6. phase change accumulator, 7. valve system, 8. discharge port, 9. circulating water system, and 10. steam accumulator. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 2 As shown, this embodiment of the invention provides a high-temperature liquid slag granulation and waste heat recovery system, including a granulation furnace 5, a granulation cooling component, and a waste heat recovery component. The granulation furnace 5 has an internal receiving space that is in communication with the high-temperature liquid slag.

[0027] The granulation cooling assembly is installed inside the granulation furnace 5. The granulation cooling assembly includes a liquid-cooled granulation element and an air granulation element. The air granulation element is connected to the high-pressure airflow and has an airflow nozzle facing the containment space. The liquid-cooled granulation element is connected to cooling water and has a liquid flow nozzle facing the containment space.

[0028] The waste heat recovery assembly includes a liquid phase waste heat recovery element and a vapor phase waste heat recovery element. The vapor phase waste heat recovery element is connected to the upper part of the containment space, and the liquid phase waste heat recovery element is connected to the bottom of the containment space.

[0029] When using the high-temperature liquid slag granulation and waste heat recovery system device provided by this utility model, the granulation furnace's containment space is connected to the high-temperature liquid slag, allowing the high-temperature liquid slag to enter the containment space. The air granulation element is connected to the high-pressure airflow, and the high-pressure airflow is injected into the containment space through the air granulation element installed in the granulation furnace. At the same time, the cooling water is connected to the liquid-cooled granulation element, and the cooling water is injected into the containment space through the liquid-cooled granulation element. The high-temperature liquid slag is granulated under the combined action of the cooling water injection and the high-pressure airflow.

[0030] Simultaneously, cooling water and high-pressure airflow cool the granulated liquid slag. Since the cooling water will rapidly vaporize upon encountering the high-temperature liquid slag, the water sprayed by the liquid-cooled granulation element into the liquid slag exchanges heat with the high-temperature liquid slag. Part of the cooling water evaporates to form high-temperature steam, while part of the cooling water does not evaporate but its temperature rises to form high-temperature water. The high-temperature steam in a vapor state rises in the containment space and enters the vapor phase waste heat recovery element connected to the upper part of the containment space. The high-temperature steam is heat-recovered by the vapor phase waste heat recovery element. The high-temperature water that has not been vaporized after exchanging heat with the high-temperature liquid slag falls to the bottom of the containment space under its own weight. The liquid medium is heat-recovered by the liquid phase waste heat recovery element connected to the bottom of the containment space.

[0031] Therefore, the high-temperature liquid slag granulation and waste heat recovery system provided by this utility model combines air granulation elements and liquid cooling elements to perform granulation and cooling treatment on liquid slag, making the liquid slag granulation more complete, improving the granulation effect of liquid slag, and facilitating the recycling of high-temperature slag; at the same time, it improves the cooling speed and cooling effect of granulated slag, and recovers the heat from the high-temperature water and high-temperature steam generated in the granulation furnace, which facilitates the full utilization of energy in the later stage, effectively recovers high-quality waste heat, and reduces energy consumption.

[0032] Further optimization of the scheme involves several nozzles 2 installed within the granulation furnace 5. Each nozzle 2 has multiple liquid jet nozzles used to spray cooling water onto the high-temperature liquid slag. The nozzles 2 directly spray the hot liquid slag into the granulation furnace 5, breaking it up. The number of nozzles 2 can be adjusted adaptively according to the size of the granulation furnace 5 and the feeding speed of the hot liquid slag. Preferably, high-pressure water nozzles are used for the nozzles 2, spraying high-pressure water into the granulation furnace to accelerate the breaking up of the liquid slag and improve the granulation effect.

[0033] Preferably, a feed inlet 1 is located at the top center of the granulation furnace 5, and the feed inlet 1 is connected to the receiving space; all nozzles 2 are arranged in a ring on the inner wall of the granulation furnace 5, with the liquid jet nozzles on the nozzles 2 facing the feed inlet 1. During the falling process of the liquid slag, the ring-arranged nozzles spray cooling water from all directions onto the liquid slag, concentrating the cooling water spray on the high-temperature liquid slag, thereby improving the slag granulation effect and the cooling effect of the slag.

[0034] Further optimization of the scheme involves using a high-pressure air nozzle 3 as the air granulation element, with several airflow injection ports on the nozzle 3. The air ejected from the high-pressure air nozzle 3 forms a high-speed airflow that rapidly disperses the liquid slag and achieves the granulation effect. Simultaneously, a high-pressure water nozzle 2 also sprays water onto the liquid slag, with both working together to granulate it. Furthermore, the high-speed airflow from the high-pressure air nozzle 3 drives the high-temperature steam upwards, accelerating the internal airflow and renewal, improving cooling efficiency, and increasing the amount of heat recovered by the vapor phase waste heat recovery element.

[0035] Preferably, a feed inlet 1 is located at the center of the top of the granulation furnace 5, and the feed inlet 1 is connected to the receiving space; the high-pressure air nozzle 3 is located directly below the feed inlet 1, and the feed inlet 1 and the high-pressure air nozzle 3 are arranged coaxially and collinearly. During the falling process of the liquid slag, the high-pressure air nozzle 3 acts rapidly from bottom to top on the high-temperature liquid slag, and the high-speed airflow drives the high-temperature steam in the granulation furnace 5 to move rapidly from bottom to top, thereby being recovered by the vapor phase waste heat recovery element connected to the upper part of the receiving space.

[0036] Further optimizing the scheme, the liquid phase waste heat recovery element is a phase change heat accumulator 6, which is connected to the bottom of the granulation furnace 5. The phase change heat accumulator 6 is used for heat exchange with the high-temperature water. The phase change heat accumulator 6 exchanges heat with the high-temperature water flowing out of the granulation furnace 5, causing the high-temperature water to cool down and form cooling water. The phase change heat accumulator 6 then applies the absorbed heat energy to other equipment or applications, effectively utilizing the heat energy. Alternatively, a heat exchanger can be used for heat recovery, where the high-temperature water and the cooling medium exchange heat in the heat exchanger. The cooling medium can then be directly or indirectly used by other equipment, depending on the specific circumstances.

[0037] In addition, a discharge port 8 is provided at the bottom of the granulation furnace 5, and a water filter assembly 4 is installed inside the granulation furnace 5, positioned above the discharge port 8. The discharge port 8 includes a high-temperature water discharge port and a granulated slag discharge port, which is connected to the phase change accumulator 6. The water filter assembly 4 separates the granulated and cooled granulated slag from the high-temperature water. The separated high-temperature water is transported to the phase change accumulator 6 through the high-temperature water discharge port and pipeline for heat recovery, while the cooled granulated slag is discharged through the granulated slag discharge port. In this device, the feed inlet 1, high-pressure air nozzle 3, water filter assembly 4, and discharge port 8 are arranged coaxially and collinearly to ensure that the high-pressure air nozzle 3 fully granulates and cools the liquid slag entering through the feed inlet 1. The cooled granulated particles can directly enter the water filter assembly 4 for high-temperature water filtration, and the filtered granulated particles are discharged through the discharge port 8. Both the high-temperature water discharge port and the granulated slag discharge port are equipped with valves. This utility model also discloses a valve system 7, which controls the control of the valves inside the entire device.

[0038] The water filtration assembly 4 includes a filter screen cylinder with an inverted frustum structure at the top and a cylindrical structure at the bottom. The top of the filter screen cylinder abuts against the inner wall of the bottom of the granulation furnace 5, ensuring that all falling granulated slag falls into the filter screen cylinder, preventing it from entering the phase change accumulator 6 through the high-temperature water discharge port. A filter chamber is provided between the lower part of the filter screen cylinder and the bottom of the granulation furnace 5, and the filter chamber is connected to the high-temperature water discharge port. The falling high-temperature water enters the filter chamber after being filtered by the filter screen cylinder, and then enters the phase change accumulator 6 through the high-temperature water discharge port. The phase change accumulator 6 recovers the heat from the high-temperature water. The granulated slag cannot pass through the filter holes on the filter screen cylinder and is retained inside the filter screen cylinder. The inside of the filter screen cylinder is connected to the granulated slag discharge port, and the granulated slag retained inside the filter screen cylinder is discharged from the granulation furnace 5 through the granulated slag discharge port.

[0039] Preferably, a circulating water system 9 connects the liquid-cooled granulation element and the phase change accumulator 6. The circulating water system 9 supplies the water cooled by the phase change accumulator 6 to the liquid-cooled granulation element; that is, the outlet of the circulating water system 9 is connected to the nozzle 2, thereby realizing water recycling. Of course, when the required amount of cooling water is insufficient, the nozzle 2 can also be directly connected to a cooling water supply pipe to ensure the normal operation of the nozzle 2. In addition, the circulating water system 9 is equipped with components such as a water pump and a filter to filter and transport the water cooled by the phase change accumulator 6.

[0040] Further optimization of the scheme involves several steam accumulators 10 as the vapor phase waste heat recovery elements. These steam accumulators 10 are connected to the top of the granulation furnace 5, and an exhaust fan is installed between them. In this embodiment, the vapor phase waste heat recovery elements consist of two symmetrically arranged steam accumulators 10, which work together to recover heat from the high-temperature steam. Under the action of the high-speed airflow formed by the high-pressure air nozzle 3, the high-temperature steam moves upward. The exhaust fan extracts the high-temperature steam and other gases from the granulation furnace 5 and transfers them to the steam accumulators 10, where they recover and utilize the heat from the high-temperature steam. Alternatively, a heat exchanger can be used as the vapor phase waste heat recovery element, where the high-temperature steam and cooling medium exchange heat. The cooling medium can be directly or indirectly used by other equipment, depending on the specific circumstances.

[0041] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model; at the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this utility model specification should not be construed as a limitation of this utility model.

[0042] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0044] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A high-temperature liquid slag granulation and waste heat recovery system device, characterized in that, include: Granulation furnace (5), the granulation furnace (5) is provided with a receiving space inside, the receiving space is able to be connected with high temperature liquid slag; Granulation cooling assembly, the granulation cooling assembly is disposed in the granulation furnace (5), the granulation cooling assembly includes a liquid-cooled granulation element and an air granulation element, the air granulation element is connected to a high-pressure airflow and the air granulation element is provided with an airflow injection port toward the containment space, the liquid-cooled granulation element is connected to cooling water and the liquid-cooled granulation element is provided with a liquid flow injection port toward the containment space; The waste heat recovery assembly includes a liquid phase waste heat recovery element and a vapor phase waste heat recovery element. The vapor phase waste heat recovery element is connected to the upper part of the containing space, and the liquid phase waste heat recovery element is connected to the bottom of the containing space.

2. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 1, characterized in that, The liquid-cooled granulation element is a plurality of nozzles (2) disposed in the granulation furnace (5), and the nozzles (2) are provided with a plurality of liquid flow injection ports.

3. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 2, characterized in that, The granulation furnace (5) has a feed inlet (1) at the top center position, and the feed inlet (1) is connected to the accommodating space; all the nozzles (2) are arranged on the inner wall of the granulation furnace (5), and the liquid jet nozzles on the nozzles (2) are arranged facing the feed inlet (1).

4. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 1, characterized in that, The air atomizing element is a high-pressure air nozzle (3), and the high-pressure air nozzle (3) has several airflow injection ports.

5. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 4, characterized in that, The granulation furnace (5) has a feed inlet (1) at the top center position, and the feed inlet (1) is connected to the accommodating space; the high-pressure air nozzle (3) is located directly below the feed inlet (1) and the feed inlet (1) and the high-pressure air nozzle (3) are arranged coaxially and collinearly.

6. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 1, characterized in that, The liquid phase waste heat recovery element is a phase change heat accumulator (6), which is connected to the bottom of the granulation furnace (5).

7. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 6, characterized in that, The granulation furnace (5) is provided with a discharge port (8) at the bottom. The granulation furnace (5) is provided with a water filter assembly (4). The water filter assembly (4) is located above the discharge port (8). The discharge port (8) includes a high-temperature water discharge port and a granulation furnace slag discharge port. The high-temperature water discharge port is connected to the phase change heat accumulator (6).

8. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 7, characterized in that, A circulating water system (9) is connected between the liquid-cooled granulation element and the phase change heat storage device (6). The circulating water system (9) is used to supply water cooled by the phase change heat storage device (6) to the liquid-cooled granulation element.

9. The high-temperature liquid slag granulation and waste heat recovery system device according to claim 1, characterized in that, The vapor phase waste heat recovery element consists of several steam accumulators (10), which are connected to the top of the granulation furnace (5).

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