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

Abstract

The invention 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, 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 opening facing a containing space, and the air flow jet opening is communicated with the liquid cooling granulation element. The liquid cooling granulation element can be communicated with cooling water and is provided with a liquid flow jet orifice facing the accommodating space. According to the high-temperature liquid slag granulation and waste heat recovery system device provided by the invention, the air granulation element and the liquid cooling element are combined to jointly carry out granulation treatment and cooling treatment on the 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 granulation furnace is recovered; energy can be fully utilized in the later period, high-quality waste heat is effectively recycled, the production cost is reduced, energy consumption is reduced, and therefore great benefits are brought to economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of slag recycling, and in particular relates to high-temperature liquid slag granulation and waste heat recovery. Background Art

[0002] With the development of non-ferrous metal and metallurgical industries, slag emissions are increasing. High-temperature slag is the waste slag discharged from the furnace during metal smelting and is a by-product of the smelting process. Due to the backward technology of slag recycling in my country, only a small part is used for cement and road construction, and most of it 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 to pour liquid slag into the slag tank and evenly flow into the granulator, so that the liquid slag is thrown out along the tangent direction, thereby forming slag particles with good stability. Slag granulation requires small investment, small land occupation, good environmental performance, and small particle size of granulated slag, less free calcium oxide and magnesium oxide, and good stability of granulated slag, which is conducive to the recycling of waste slag.

[0004] The annual output of high-temperature slag is several hundred million tons, and high-temperature slag is a high-quality waste heat resource. From a qualitative point of view, the sensible heat of slag is of high energy value; from a quantitative point of view, the energy that can be recovered is also huge. Therefore, if the waste energy of high-temperature slag can be recycled and reused, a lot of resources can be saved.

[0005] The 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 of liquid blast furnace slag. It is very necessary to study a liquid blast furnace slag granulation and waste heat recovery system device with good granulation effect, simple structure and good reliability. Summary of the invention

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

[0007] To achieve the above object, the present invention provides a high-temperature liquid slag granulation and waste heat recovery system device, comprising:

[0008] A granulation furnace, wherein a receiving space is provided inside the granulation furnace, and the receiving space can be in conduction with the high-temperature liquid slag;

[0009] A granulation cooling assembly, the granulation cooling assembly is arranged in the granulation furnace, the granulation cooling assembly comprises a liquid-cooling granulation element and an air granulation element, the air granulation element can be communicated with a high-pressure airflow and the air granulation element is provided with an airflow injection port toward the accommodation space, the liquid-cooling granulation element can be communicated with cooling water and the liquid-cooling granulation element is provided with a liquid flow injection port toward the accommodation space;

[0010] A waste heat recovery component, the waste heat recovery component 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 accommodating space, and the liquid phase waste heat recovery element is connected to the bottom of the accommodating space.

[0011] Optionally, the liquid-cooled granulation elements are a plurality of nozzles arranged in the granulation furnace, and a plurality of liquid flow injection ports are arranged on the nozzles.

[0012] Optionally, a feed inlet is provided at the top center of the granulating furnace, and the feed inlet is communicated with the accommodating space; all the nozzles are arranged on the inner wall of the granulating furnace, and the liquid flow injection ports on the nozzles are arranged toward the feed inlet.

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

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

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

[0016] Optionally, a discharge port is provided at the bottom of the granulating furnace, and a water filter assembly is provided in the granulating furnace, and the water filter assembly is arranged above the discharge port. The discharge port includes a high-temperature water discharge port and a granulated slag discharge port, and the high-temperature water discharge port is connected to the phase change heat accumulator.

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

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

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

[0020] When using a high-temperature liquid slag granulation and waste heat recovery system device provided by the present invention, the storage space of the granulation furnace is connected to the high-temperature liquid slag, the high-temperature liquid slag enters the storage space, the air granulation element is connected to the high-pressure airflow, and the high-pressure airflow is sprayed into the storage space through the air granulation element arranged in the granulation furnace; at the same time, the cooling water is connected to the liquid-cooled granulation element, and the cooling water is sprayed into the storage space through the liquid-cooled granulation element, and the high-temperature liquid slag is granulated under the combined action of the cooling water spray and the high-pressure airflow; at the same time, the cooling water and the high-pressure airflow cool the granulated liquid slag, and the cooling water will quickly vaporize after encountering the high-temperature liquid slag, and the high-temperature steam in a vapor state rises in the storage space and enters the storage space above the storage space. In the vapor-phase waste heat recovery element connected to the bottom of the accommodating space, the high-temperature steam is heat recovered by the vapor-phase waste heat recovery element, and the high-temperature water that is not vaporized after heat exchange with the high-temperature liquid slag falls to the bottom of the accommodating space under the action of its own weight, and the liquid medium is heat recovered by the liquid-phase waste heat recovery element connected to the bottom of the accommodating space; it can be seen that the high-temperature liquid slag granulation and waste heat recovery system device provided by the present invention granulates and cools the liquid slag through the combination of air granulation elements and liquid cooling elements, improves the cooling speed and cooling effect of the granulated slag, and recovers the heat in the high-temperature water and high-temperature steam generated in the granulation furnace, which can reduce production costs and energy consumption, thereby greatly benefiting the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the high-temperature liquid slag granulation and waste heat recovery system of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the water filtration component of the present invention.

[0024] Among them, 1. feed inlet, 2. nozzle, 3. high-pressure air nozzle, 4. water filtration component, 5. granulation furnace, 6. phase change heat accumulator, 7. valve system, 8. discharge port, 9. circulating water system, 10. steam heat accumulator. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] like Figure 1 to Figure 2 As shown, the embodiment of the present invention provides a high temperature liquid slag granulation and waste heat recovery system device, including a granulation furnace 5, a granulation cooling component and a waste heat recovery component. The granulation furnace 5 is provided with a receiving space inside, and the receiving space can be connected to the high temperature liquid slag.

[0027] The granulation cooling assembly is arranged in the granulation furnace 5, and the granulation cooling assembly includes a liquid-cooled granulation element and an air granulation element. The air granulation element can be communicated with the high-pressure airflow and the air granulation element is provided with an airflow injection port toward the accommodating space, and the liquid-cooled granulation element can be communicated with the cooling water and the liquid-cooled granulation element is provided with a liquid flow injection port toward the accommodating space.

[0028] The waste heat recovery component 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 accommodating space, and the liquid phase waste heat recovery element is connected to the bottom of the accommodating space.

[0029] When using a high-temperature liquid slag granulation and waste heat recovery system device provided by the present invention, the accommodating space of the granulating furnace is connected to the high-temperature liquid slag, the high-temperature liquid slag enters the accommodating space, the air granulating element is connected to the high-pressure airflow, and the high-pressure airflow is sprayed into the accommodating space through the air granulating element arranged in the granulating furnace; at the same time, the cooling water is connected to the liquid-cooled granulating element, and the cooling water is sprayed into the accommodating space through the liquid-cooled granulating element, and the high-temperature liquid slag is granulated under the combined action of the cooling water spray and the high-pressure airflow.

[0030] At the same time, the cooling water and the high-pressure airflow cool the granulated liquid slag. Based on the fact that the cooling water will quickly vaporize when encountering the high-temperature liquid slag, the water sprayed by the liquid-cooled granulation element to the liquid slag exchanges heat with the high-temperature liquid slag. Part of the cooling water evaporates to form high-temperature steam, and 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 accommodation space and enters the vapor phase waste heat recovery element connected to the upper part of the accommodation space, and the high-temperature steam is heat recovered by the vapor phase waste heat recovery element, while the high-temperature water that is not vaporized after the heat exchange with the high-temperature liquid slag falls to the bottom of the accommodation space under the action of its own weight, and the liquid medium is heat recovered by the liquid phase waste heat recovery element connected to the bottom of the accommodation space.

[0031] It can be seen that the high-temperature liquid slag granulation and waste heat recovery system device provided by the present invention granulates and cools the liquid slag through the combination of air granulation elements and liquid cooling elements, so that the liquid slag is granulated more fully, the granulation effect of the liquid slag is improved, and the high-temperature slag is recycled; at the same time, the cooling speed and cooling effect of the granulated slag are improved, and the heat in the high-temperature water and high-temperature steam generated in the granulation furnace is recovered, which is convenient for the full utilization of energy in the later stage, effectively recovering high-quality waste heat and reducing energy consumption.

[0032] A further optimized solution is that the liquid-cooled granulation element is a plurality of nozzles 2 arranged in the granulation furnace 5, and a plurality of liquid flow injection ports are arranged on the nozzles 2, and the liquid flow injection ports are used to spray cooling water to the high-temperature liquid slag. The nozzles 2 directly spray to the high-temperature liquid slag that has just entered the granulation furnace 5 to break up the high-temperature liquid slag. The number of nozzles 2 can be adaptively adjusted according to the size of the granulation furnace 5, the feeding speed of the high-temperature liquid slag, etc. Preferably, the nozzles 2 use high-pressure water nozzles, and spray high-pressure water into the granulation furnace through the high-pressure water nozzles to accelerate the breaking up of the liquid slag and improve the granulation effect of the slag.

[0033] Preferably, a feed inlet 1 is provided at the top center of the granulating furnace 5, and the feed inlet 1 is in communication with the accommodation space; all the nozzles 2 are arranged in a ring on the inner wall of the granulating furnace 5, and the liquid flow injection ports on the nozzles 2 are arranged toward the feed inlet 1. When the liquid slag falls, the nozzles arranged in a ring spray cooling water from all directions to the liquid slag, and the high-temperature liquid slag is sprayed with cooling water in a concentrated manner, thereby improving the granulation effect of the slag and the cooling effect of the slag.

[0034] Further optimization scheme, the air granulation element is a high-pressure air nozzle 3, and the high-pressure air nozzle 3 is provided with a plurality of airflow injection ports. The air ejected from the high-pressure air nozzle 3 forms a high-speed airflow, which quickly breaks up the liquid slag and completes the granulation effect. At the same time, the nozzle 2 using the high-pressure water nozzle also sprays at the liquid slag, and the two together granulate the liquid slag. At the same time, the high-speed airflow formed by the air ejected from the high-pressure air nozzle 3 will drive the high-temperature steam to move upward, accelerate the flow and renewal of the internal air, improve the cooling efficiency, and more heat will be recovered by the vapor phase waste heat recovery element.

[0035] Preferably, a feed port 1 is provided at the top center of the granulating furnace 5, and the feed port 1 is communicated with the accommodation space; the high-pressure air nozzle 3 is provided directly below the feed port 1, and the feed port 1 and the high-pressure air nozzle 3 are coaxially arranged. When the liquid slag falls, the high-pressure air nozzle 3 acts on the high-temperature liquid slag rapidly from bottom to top, and the high-speed airflow drives the high-temperature steam in the granulating furnace 5 to move rapidly from bottom to top, so that it is recovered by the vapor phase waste heat recovery element communicated with the upper part of the accommodation space.

[0036] Further optimization scheme, the liquid phase waste heat recovery element is a phase change heat accumulator 6, the phase change heat accumulator 6 is connected to the bottom of the granulation furnace 5, and the phase change heat accumulator 6 is used to exchange heat 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, and the temperature of the high temperature water is reduced to form cooling water. The phase change heat accumulator 6 applies the absorbed heat energy to other equipment or applications, and effectively utilizes the heat energy. Of course, the liquid phase waste heat recovery element can also use a heat exchanger for heat recovery, that is, the high temperature water and the cooling medium exchange heat in the heat exchanger, and the cooling medium is directly or indirectly used by other equipment, which can be implemented according to actual conditions.

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

[0038] The water filter assembly 4 includes a filter screen cylinder, the upper part of which is an inverted truncated cone structure, and the lower part of which is a cylindrical structure. The top of the filter screen cylinder is in contact with the inner wall of the bottom end of the granulating furnace 5, ensuring that all the falling granulated slag can fall into the inside of the filter screen cylinder, and preventing the granulated slag from entering the phase change heat accumulator 6 through the high-temperature water discharge port. A filter cavity is arranged between the lower part of the filter screen cylinder and the bottom of the granulating furnace 5, and the filter cavity is connected to the high-temperature water discharge port. The falling high-temperature water enters the filter cavity after filtering by the filter screen cylinder, and the high-temperature water in the filter cavity enters the phase change heat accumulator 6 through the high-temperature water discharge port, and the phase change heat accumulator 6 recovers the heat in the high-temperature water. The granulated slag cannot pass through the filter holes on the filter screen cylinder and is stored in the filter screen cylinder. The inside of the filter screen cylinder is connected to the granulated slag discharge port, and the granulated slag stored in the filter screen cylinder is discharged from the granulating furnace 5 through the granulated slag discharge port.

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

[0040] Further optimization scheme, the vapor phase waste heat recovery element is a plurality of steam heat accumulators 10, the steam heat accumulators 10 are connected to the top of the granulating furnace 5, and an exhaust fan is arranged between the steam heat accumulators 10 and the granulating furnace 5. In this embodiment, the vapor phase waste heat recovery element is two steam heat accumulators 10 arranged symmetrically on the left and right, and the two steam heat accumulators 10 jointly recover the heat of 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, and the high-temperature steam and other gases in the granulating furnace 5 are extracted by the exhaust fan and transmitted to the steam heat accumulator 10, and the steam heat accumulator 10 recovers and utilizes the heat in the high-temperature steam. Of course, the vapor phase waste heat recovery element can also use a heat exchanger, that is, the high-temperature steam and the cooling medium exchange heat in the heat exchanger, and the cooling medium is directly or indirectly used by other equipment, which can be implemented according to actual conditions.

[0041] The description of the above embodiments is only used to help understand the method of the present invention and its core concept; at the same time, for a person skilled in the art, according to the concept of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of the specification of the present invention should not be understood as a limitation of the present invention.

[0042] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships 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, and therefore should not be understood as a limitation on the present invention.

[0044] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-temperature liquid slag granulation and waste heat recovery system device, characterized in that: include: A granulation furnace (5), wherein a receiving space is provided inside the granulation furnace (5), and the receiving space can be in conduction with the high-temperature liquid slag; a granulation cooling assembly, the granulation cooling assembly being arranged in the granulation furnace (5), the granulation cooling assembly comprising a liquid-cooling granulation element and an air-cooling granulation element, the air-cooling granulation element being able to communicate with a high-pressure airflow and being provided with an airflow injection port toward the accommodation space, the liquid-cooling granulation element being able to communicate with cooling water and being provided with a liquid flow injection port toward the accommodation space; A waste heat recovery component, the waste heat recovery component 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 accommodating space, and the liquid phase waste heat recovery element is connected to the bottom of the accommodating space.

2. A high temperature liquid slag granulation and waste heat recovery system according to claim 1, characterized in that: The liquid-cooling granulation elements are a plurality of nozzles (2) arranged in the granulation furnace (5), and a plurality of liquid flow injection ports are arranged on the nozzles (2).

3. A high temperature liquid slag granulation and waste heat recovery system according to claim 2, characterized in that: A feed inlet (1) is provided at the top center of the granulating furnace (5), and the feed inlet (1) is communicated with the accommodating space; all the nozzles (2) are arranged on the inner wall of the granulating furnace (5), and the liquid flow injection ports on the nozzles (2) are arranged toward the feed inlet (1).

4. The high-temperature liquid slag granulation and waste heat recovery system according to claim 1, characterized in that: The air granulation element is a high-pressure air nozzle (3), and a plurality of air flow injection ports are provided on the high-pressure air nozzle (3).

5. A high temperature liquid slag granulation and waste heat recovery system according to claim 4, characterized in that: A feed inlet (1) is provided at the top center of the granulating furnace (5), and the feed inlet (1) is communicated with the accommodating space; the high-pressure air nozzle (3) is provided directly below the feed inlet (1), and the feed inlet (1) and the high-pressure air nozzle (3) are coaxially arranged.

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

7. A high temperature liquid slag granulation and waste heat recovery system according to claim 6, characterized in that: A discharge port (8) is provided at the bottom of the granulating furnace (5), a water filter assembly (4) is provided in the granulating furnace (5), the water filter assembly (4) is arranged above the discharge port (8), the discharge port (8) comprises a high-temperature water discharge port and a granulated slag discharge port, and 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 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 accumulator (6), and the circulating water system (9) is used to supply water cooled by the phase-change heat accumulator (6) to the liquid-cooled granulation element.

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

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