High-temperature steel slag air-cooling crushing waste heat recovery steam power generation device

Abstract

The utility model provides a high-temperature steel slag air cooling crushing waste heat recovery steam power generation device which comprises a slag tank, a slag overturning device, a slag crushing device, an air cooling device, a transfer device, a slag cooling device, a waste heat recovery device, a steam generation device, a heat storage device and a power generation device. The slag breaking device is arranged in the air cooling device, the transferring device is connected with the air cooling device and the slag cooling device in a transferring mode, the waste heat recovery device is connected with the air cooling device and the heat storage device, and the steam generation device is connected with the slag cooling device and the heat storage device. Cooling water of the slag cooling device absorbs heat to generate high-temperature pressurized water, and steam output from the waste heat recovery device and / or the steam generation device enters the heat storage device; according to the utility model, the short-process efficient heat energy recovery and conversion power generation treatment of the steel slag can be realized through the heat energy recovery and utilization of the heat-state materials and the stabilization treatment of the steel slag.

Description

Technical Field

[0001] This utility model relates to the field of molten steel slag treatment technology, and more specifically, to a high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device. Background Technology

[0002] In the steel production process, approximately 0.1-0.12 tons of steel slag are generated per ton of steel, with an annual production exceeding 100 million tons. Molten steel slag contains considerable latent and sensible heat. Current pretreatment processes for steel slag include hot quenching, hot pouring, drum quenching, and air quenching. Hot quenching, hot pouring, and drum quenching all utilize wet methods to treat steel slag, resulting in steam with high dust content and unstable flow rates, making them unsuitable for direct use in steam turbines for power generation. While air quenching utilizes a dry method, the entire process takes place in a relatively open environment, leading to severe pollution and difficulties in heat recovery. None of these processes can achieve stable and reliable heat recovery from steel slag. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device. Through the recovery and utilization of thermal energy from hot materials and the stabilization treatment of steel slag, it can achieve efficient short-process heat recovery and conversion of steel slag into power generation.

[0004] This utility model provides a high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device, including a slag pot, a slag turning device, a slag breaking device, an air-cooling device, a transfer device, a cold slag device, a waste heat recovery device, a steam generator, a heat storage device, and a power generation device. The slag turning device is accessible and located on one side of the air-cooling device. The slag breaking device is located inside the air-cooling device. The transfer device transfers and connects the air-cooling device and the cold slag device. The waste heat recovery device connects the air-cooling device and the heat storage device. The steam generator connects the cold slag device and the heat storage device. The heat storage device is connected to the power generation device.

[0005] Furthermore, the cooling water in the slag cooling device absorbs heat to generate high-temperature pressurized water, and the steam output from the waste heat recovery device and / or the steam generator enters the heat storage device. The slag cooling device includes an annular water-cooled pipe assembly, in which the cooling water absorbs heat to generate high-temperature pressurized water. The high-temperature pressurized water enters the steam generator to produce steam, and the slag pot can enter and exit the air-cooling device and the slag breaking device through the slag turning device.

[0006] Furthermore, the waste heat recovery device is a medium-pressure waste heat boiler with a rated steam pressure of 1.6 MPa and a rated steam temperature of 300℃.

[0007] Furthermore, a superheater is provided in the heat storage device, and an exhaust valve is provided between the heat storage device and the power generation device.

[0008] Furthermore, it also includes a dust removal system, which is connected to the waste heat recovery device and the air cooling device.

[0009] Furthermore, it also includes a control system, which controls the slag turning device, slag breaking device, air cooling device, transfer device, slag cooling device, waste heat recovery device 7, steam generator, heat storage device, power generation device, and dust removal system respectively.

[0010] Furthermore, the slag breaking device includes a fixed crushing bed and a slag breaking machine. The slag breaking machine is installed on the fixed crushing bed. The fixed crushing bed is covered with steel plates, the lower part of the steel plates is filled with castable material, and the upper part of the steel plates is covered with a steel slag cushion layer.

[0011] Furthermore, the air-cooling device includes a fixed air-cooling bed, a blower, a grooved grate, and a fire door. The fire door is openable and closable and is located on one side of the air-cooling device. The grooved grate is laid on the fixed air-cooling bed, and the blower is connected to the lower part of the fixed air-cooling bed.

[0012] Furthermore, the rollers of the slag crusher are cooled by water, and the cooling water used is fresh industrial water.

[0013] Furthermore, the grooved grate has a labyrinthine ventilation design.

[0014] Furthermore, the slag material on the fixed air-cooled bed stays for 15-20 minutes, and the blower blows in ambient temperature air to exchange the waste heat of the slag material. The temperature of the cooled slag material is about 600℃-800℃, and the temperature of the discharged high-temperature flue gas is about 450℃.

[0015] This invention employs a roller crushing-stabilization treatment-heat recovery method to process molten steel slag. The slag crusher initially cools and crushes the molten steel slag at 1400-1600℃, pushes it to a fixed air-cooled bed, and cools it to approximately 600℃-800℃ by forced air. The discharged slag is then transferred to a slag cooling device for further cooling, reducing the temperature to 60℃-100℃ before discharge. The high-temperature pressure steam generated during the process undergoes superheating treatment through a heat storage device, and outputs superheated steam at a constant pressure for power generation. The roller crushing system works in conjunction with the heat exchange system to achieve continuous production of molten steel slag processing and heat recovery power generation, significantly improving the efficiency of steel slag processing and the rate of heat recovery and utilization.

[0016] This invention features a compact device that provides a fully enclosed processing environment, reducing dust-laden steam emissions. The system rapidly lowers slag temperature throughout the process, and the recovered heat is used to generate steam for power generation. It boasts high automation, continuous production, high processing efficiency, minimal footprint, heat recovery and utilization, and compliance with environmental emission standards, thus meeting the environmental protection and resource utilization requirements for steel slag treatment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall operation of a high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device provided by this utility model;

[0019] Figure 2 A flowchart of a method for generating steam from waste heat recovered from air-cooled crushing of high-temperature steel slag, provided by this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Slag pot, 2-Slag turning device, 3-Slag breaking device, 4-Air cooling device, 5-Transfer device, 6-Slag cooling device, 7-Waste heat recovery device, 8-Steam generator, 9-Heat storage device, 10-Power generation device, 11-Dust removal system, 12-Control system, 31-Fixed crushing bed, 32-Slag breaking machine, 41-Fixed air-cooled bed, 42-Blower, 43-Groove grate, 44-Fireproof door, 91-Superheater, 92-Exhaust valve. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] See appendix Figure 1This utility model provides a high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device, including a slag pot 1, a slag turning device 2, a slag breaking device 3, an air-cooling device 4, a transfer device 5, a slag cooling device 6, a waste heat recovery device 7, a steam generator 8, a heat storage device 9, and a power generation device 10. The slag turning device 2 is accessible and located on one side of the air-cooling device 4. The slag breaking device 3 is located inside the air-cooling device 4. The transfer device 5 connects the air-cooling device 4 and the slag cooling device 6. The waste heat recovery device 7 connects the air-cooling device 4 and the heat storage device 9. The steam generator 8 connects the slag cooling device 6 and the heat storage device 9. The heat storage device 9 is connected to the power generation device 10.

[0025] Furthermore, the cooling water in the slag cooling device 6 absorbs heat to generate high-temperature pressurized water, and the steam output from the waste heat recovery device 7 and / or the steam generator 8 enters the heat storage device 9. The slag cooling device 6 includes an annular water-cooled pipe assembly 61, in which the cooling water absorbs heat to generate high-temperature pressurized water, and the high-temperature pressurized water enters the steam generator 8 to generate steam. The slag tank 1 can enter and exit the air-cooling device 4 and the slag breaking device 3 through the slag turning device 2.

[0026] Furthermore, the waste heat recovery device 7 is a medium-pressure waste heat boiler with a rated steam pressure of 1.6 MPa and a rated steam temperature of 300°C.

[0027] Furthermore, a superheater 91 is provided in the heat storage device 9, and an exhaust valve 92 is provided between the heat storage device 9 and the power generation device 10.

[0028] Furthermore, it also includes a dust removal system 11, which is connected to the waste heat recovery device 7 and the air cooling device 4.

[0029] Furthermore, it also includes a control system 12, which controls and connects the slag turning device 2, the slag breaking device 3, the air cooling device 4, the transfer device 5, the slag cooling device 6, the waste heat recovery device 7, the steam generator 8, the heat storage device 9, the power generation device 10, and the dust removal system 11.

[0030] Furthermore, the slag breaking device 3 includes a fixed crushing bed 31 and a slag breaking machine 32. The slag breaking machine 32 is installed on the fixed crushing bed 31. The fixed crushing bed 31 is covered with steel plates, the lower part of the steel plates is filled with castable material, and the upper part of the steel plates is covered with a steel slag cushion layer.

[0031] Furthermore, the air-cooling device 4 includes a fixed air-cooling bed 41, a blower 42, a grooved grate 43, and a fire door 44, wherein the fire door 44 is openable and closable and is located on one side of the air-cooling device 4.

[0032] Furthermore, a grooved grate plate 43 is laid on the fixed air-cooled bed 41, and the blower 42 is connected to the lower part of the fixed air-cooled bed 41.

[0033] Furthermore, the 32 rollers of the slag crusher need to be cooled by water, and the cooling water used is fresh industrial water.

[0034] Furthermore, a steel plate is laid on the fixed crushing bed 31, the lower part of the steel plate is filled with castable refractory, and a steel slag cushion layer is laid on the upper part of the steel plate. Both the steel slag cushion layer and the castable refractory play a role in heat insulation and protection, reducing structural damage to the bed body caused by high temperature.

[0035] Furthermore, the grooved grate plate 43 has a labyrinth ventilation design to ensure that there is no leakage during the slag processing; the slag on the fixed air-cooled bed 41 stays for 15-20 minutes, during which the residual heat of the slag is exchanged by the ambient temperature air blown in by the blower 42. The temperature of the cooled slag is about 600℃-800℃, and the temperature of the discharged high-temperature flue gas is about 450℃.

[0036] Furthermore, the heat storage device 9 is equipped with a superheater 91, which can achieve a steam superheat of 50℃-100℃; wherein, the slag discharge temperature is about 60℃-100℃.

[0037] Furthermore, the waste heat recovery device 7 is a medium-pressure waste heat boiler with a rated steam pressure of 1.6 MPa and a rated steam temperature of 300℃; the dust removal system 11 is connected to the waste heat recovery device 7 to collect dust and achieve ultra-low emissions, and the cooling water used by the waste heat recovery device 7 is demineralized water.

[0038] See appendix Figure 2 This utility model also provides a method for high-temperature steel slag air-cooled crushing waste heat recovery steam power generation, which uses the above-mentioned high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device, and includes the following steps:

[0039] Step S1. Molten slag is fed and crushed by roller pressing. The molten slag is placed in slag hopper 1 and transported to slag turning device 2 by overhead crane. Slag turning device 2 enters fixed crushing bed 31 to dump slag and transport out of empty slag hopper 1. Fire door 44 is closed and slag crusher 32 solidifies and crushes the molten slag until it no longer sticks together.

[0040] Step S2. High-temperature solid slag is cooled by air blower. The slag crusher 32 pushes the crushed high-temperature solid slag to the fixed air-cooled bed 41. The slag material is left to stand. The blower 42 blows in room temperature air to cool the slag material and discharges high-temperature flue gas.

[0041] Step S3. Waste heat is recovered to generate steam, steam is stored for power generation, high-temperature flue gas heat exchange generates steam, solid slag enters the cold slag device 6 for heat exchange to generate high-temperature pressurized water, high-temperature pressurized water enters the steam generator 8 to generate steam, and the steam output from the waste heat recovery device 7 and / or the steam generator 8 is stored for power generation.

[0042] Step S4. Solid slag discharge: After the solid slag has cooled to a certain temperature, the discharge port of the slag cooling device 6 is opened to discharge the slag.

[0043] Furthermore, step S3 also includes the following steps: high-temperature flue gas heat exchange generates steam; the high-temperature flue gas discharged from the fixed air-cooled bed 41 enters the waste heat recovery device 7 to release heat; cooling water absorbs heat to generate steam; solid slag enters the slag cooling device 6 for heat exchange to generate steam; solid slag is transported to the slag cooling device 6 via the transfer device 5; when the steam pressure in the device reaches a certain threshold, the exhaust valve 92 opens, and the superheated pressure steam drives the power generation device 10 to generate electricity.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," 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.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device, comprising a slag pot (1), a slag turning device (2), a slag crushing device (3), an air-cooling device (4), a transfer device (5), a slag cooling device (6), a waste heat recovery device (7), a steam generator (8), a heat storage device (9), and a power generation device (10), characterized in that, The slag-turning device (2) is accessible and located on one side of the outside of the air-cooling device (4). The slag-breaking device (3) is located inside the air-cooling device (4). The transfer device (5) transfers and connects the air-cooling device (4) and the slag-cooling device (6). The waste heat recovery device (7) connects the air-cooling device (4) and the heat storage device (9). The steam generator (8) connects the slag-cooling device (6) and the heat storage device (9). The heat storage device (9) is connected to the power generation device (10). The cooling water of the slag device (6) absorbs heat to generate high-temperature pressurized water. The steam output from the waste heat recovery device (7) and / or the steam generator (8) enters the heat storage device (9). The slag cooling device (6) includes a ring-shaped water-cooled pipe assembly (61). The cooling water in the ring-shaped water-cooled pipe assembly (61) absorbs heat to generate high-temperature pressurized water. The high-temperature pressurized water enters the steam generator (8) to generate steam. The slag tank (1) can enter and exit the air-cooled device (4) and the slag breaking device (3) through the slag turning device (2).

2. The high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 1, characterized in that, The waste heat recovery device (7) is a medium-pressure waste heat boiler with a rated steam pressure of 1.6 MPa and a rated steam temperature of 300°C.

3. The high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 1, characterized in that, A superheater (91) is provided in the heat storage device (9), and an exhaust valve (92) is provided between the heat storage device (9) and the power generation device (10).

4. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 1, characterized in that, It also includes a dust removal system (11), which is connected to the waste heat recovery device (7) and the air cooling device (4).

5. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 1, characterized in that, It also includes a control system (12), which controls the slag turning device (2), slag breaking device (3), air cooling device (4), transfer device (5), slag cooling device (6), waste heat recovery device (7), steam generator (8), heat storage device (9), power generation device (10), and dust removal system (11).

6. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 1, characterized in that, The slag breaking device (3) includes a fixed crushing bed (31) and a slag breaking machine (32). The slag breaking machine (32) is installed on the fixed crushing bed (31). The fixed crushing bed (31) is covered with steel plates, the lower part of the steel plates is filled with castable material, and the upper part of the steel plates is covered with a steel slag cushion layer.

7. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 1, characterized in that, The air-cooling device (4) includes a fixed air-cooling bed (41), a blower (42), a grooved grate (43), and a fire door (44). The fire door (44) is openable and closable and is located on one side of the air-cooling device (4). The grooved grate (43) is laid on the fixed air-cooling bed (41), and the blower (42) is connected to the lower part of the fixed air-cooling bed (41).

8. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 6, characterized in that, The rollers of the slag crusher (32) are cooled by water, and the cooling water used is fresh industrial water.

9. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 7, characterized in that, The grooved grate (43) is designed for labyrinthine ventilation.

10. A high-temperature steel slag air-cooled crushing waste heat recovery steam power generation device according to claim 7, characterized in that, The slag on the fixed air-cooled bed (41) stays for 15-20 minutes. The blower (42) blows in ambient temperature air to exchange the residual heat of the slag. The temperature of the cooled slag is about 600℃-800℃, and the temperature of the discharged high-temperature flue gas is about 450℃.

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