High-temperature steel slag air-cooling crushing heat energy conversion power generation method and device

Abstract

The invention provides a high-temperature steel slag air cooling crushing heat energy conversion power generation method and device.The device comprises a slag tank, a slag overturning device, a slag crushing device, an air cooling device, a transfer device, a stabilization treatment device, a waste heat recovery device, a steam purification device, a heat storage device and a power generation device; the slag breaking device is arranged in the air cooling device, the transfer device is in transfer connection with the air cooling device and the stabilization treatment device, the waste heat recovery device is connected with the air cooling device and the heat storage device, the steam purification device is connected with the stabilization treatment device and the heat storage device, and the heat storage device is connected with the heat storage device. The heat storage device is connected with the power generation device; through heat energy recycling of the hot-state materials and stabilization treatment of the steel slag, short-process efficient heat energy recycling and conversion power generation treatment of the steel slag can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of molten steel slag treatment, and more particularly, to a method and device for converting thermal energy of high-temperature steel slag by air-cooling crushing for power generation. Background Art

[0002] In the process of steel production, about 0.1 - 0.12 tons of steel slag is generated per ton of steel, and the annual output of steel slag exceeds 100 million tons. Among them, molten steel slag contains considerable latent heat and sensible heat. At present, the pretreatment processes of steel slag include heat soaking method, hot splashing method, rotary drum method, air quenching method, etc. Among them, the heat soaking method, hot splashing method, and rotary drum method all use wet methods to treat steel slag, and the generated steam has a large dust content and unstable flow rate, and cannot directly enter the steam turbine for power generation. Although the air quenching method uses a dry method to treat steel slag, the whole treatment process is carried out in a relatively open environment, with serious pollution and difficult heat recovery. None of these processes can achieve stable and reliable heat energy recovery of steel slag. Summary of the Invention

[0003] To solve the above problems, the present invention provides a method and device for converting thermal energy of high-temperature steel slag by air-cooling crushing for power generation, which can realize short-process and high-efficiency heat energy recovery and conversion for power generation of steel slag through the recovery and utilization of thermal energy of hot materials and the stabilization treatment of steel slag.

[0004] The present invention provides a method for converting thermal energy of high-temperature steel slag by air-cooling crushing, including the following steps:

[0005] Step S1. Feeding molten slag, roll pressing and crushing. The molten slag is placed in a slag pot, lifted by a crane to a slag turning device, the slag turning device enters a fixed crushing bed to pour out the slag and transports out the empty slag pot, closes the fire door, and the slag breaker solidifies and crushes the molten slag until it is no longer sticky.

[0006] Step S2. Blowing air to cool the high-temperature solid slag. The slag breaker pushes the crushed high-temperature solid slag into a fixed air-cooling bed, the slag material is static, the blower blows in normal-temperature air to cool the slag material, and discharges the high-temperature flue gas.

[0007] Step S3. Recycling waste heat to generate steam and generating power by steam energy storage. The high-temperature flue gas exchanges heat to generate steam, the solid slag enters a stabilization treatment device to exchange heat to generate steam, and the steam output from the waste heat recovery device and the steam purification device generates power by steam energy storage.

[0008] Step S4. Discharging the solid slag. After the solid slag is cooled to a certain temperature, the discharge port of the stabilization treatment device is opened to discharge the slag.

[0009] Further, step S3 further includes that the high-temperature flue gas exchanges heat to generate steam. The high-temperature flue gas discharged from the fixed air-cooling bed enters the waste heat recovery device, releases heat, and the cooling water absorbs the heat to generate steam.

[0010] Further, the step S3 further includes that the solid slag enters the stabilization treatment device for heat exchange to generate steam. The solid slag is transported to the stabilization treatment device via a transfer device. The cooling water absorbs heat to generate dust-containing steam, which enters the steam purification device.

[0011] Further, the step S3 further includes that the steam output from the waste heat recovery device and / or the steam purification device enters the heat storage device. When the steam pressure in the device reaches a certain threshold, the exhaust valve opens, and the superheated pressure steam pushes the power generation device to generate electricity.

[0012] The present invention also provides a high-temperature steel slag air-cooling crushing heat energy conversion power generation device for performing the above-mentioned high-temperature steel slag air-cooling crushing heat energy conversion power generation, including a slag tank, a slag turning device, a slag breaking device, an air-cooling device, a transfer device, a stabilization treatment device, a waste heat recovery device, a steam purification device, a heat storage device, and a power generation device. The slag turning device is disposed on one side outside the air-cooling device in an accessible manner. The slag breaking device is disposed inside the air-cooling device. The transfer device is connected to transfer the air-cooling device and the stabilization treatment device. The waste heat recovery device is connected to the air-cooling device and the heat storage device. The steam purification device is connected to the stabilization treatment device and the heat storage device. The heat storage device is connected to the power generation device. The slag tank can access the air-cooling device and the slag breaking device through the slag turning device. The steam output from the waste heat recovery device and / or the steam purification device enters the heat storage device.

[0013] Further, a dust removal system is further included, and the dust removal system is connected to the waste heat recovery device and the air-cooling device.

[0014] Further, a control system is further included, and the control system is respectively connected to control the slag turning device, the slag breaking device, the air-cooling device, the transfer device, the stabilization treatment device, the waste heat recovery device 7, the steam purification device, the heat storage device, the power generation device, and the dust removal system.

[0015] Further, the slag breaking device includes a fixed crushing bed and a slag breaker. The slag breaker is disposed on the fixed crushing bed. The fixed crushing bed is laid with steel plates, and the lower part of the steel plates is filled with castable, and the upper part of the steel plates is laid with a steel slag cushion layer.

[0016] Further, the air-cooling device includes a fixed air-cooling bed, a blower, a grooved grate, and a fire door. The fire door is disposed on one side of the air-cooling device in an openable and closable manner. The fixed air-cooling bed is laid with a grooved grate, and the lower part of the fixed air-cooling bed is connected to the blower.

[0017] Further, 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.

[0018] The present invention adopts a roller crushing-stabilization treatment-heat energy recovery method to treat molten steel slag. A slag crusher initially cools and crushes 1400-1600°C molten steel slag, pushes it to a fixed air cooling bed, and blast cools it to about 600°C-800°C. The slag is transported to a stabilization treatment device for further cooling, and the slag is discharged after being discharged at 60°C-100°C. The high-temperature pressure steam generated in the process is subjected to superheating treatment by a heat storage device, and superheated steam with constant pressure is output for power generation. The roller crushing system cooperates with the heat exchange system to operate together, which can realize the continuous production of molten steel slag treatment and heat energy recovery power generation, and greatly improve the steel slag treatment efficiency and heat energy recovery utilization rate.

[0019] The device of the present invention occupies a small space, and the overall system can realize a fully enclosed processing environment, reduce the emission of dusty steam, and quickly reduce the slag temperature during the processing process, and the recovered heat energy generates steam for power generation. It has the technical effects of high degree of automation, good production continuity, high processing efficiency, small space occupation, heat energy recovery and utilization, and environmental emission compliance, and can meet the environmental emission and resource utilization requirements of steel slag treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A flow chart of a method for converting high-temperature steel slag into electricity through air-cooling and crushing heat energy provided by the present invention;

[0022] Figure 2 The overall operation schematic diagram of a high-temperature steel slag air-cooled crushing heat energy conversion power generation device provided by the present invention.

[0023] Description of reference numerals:

[0024] 1- slag pot, 2- slag turning device, 3- slag breaking device, 4- air cooling device, 5- transfer device, 6- stabilization treatment device, 7- waste heat recovery device, 8- steam purification device, 9- heat storage device, 10- power generation device, 11- dust removal system, 12- control system, 31- fixed crushing bed, 32- slag crusher, 41- fixed air cooling bed, 42- blower, 43- grooved grate plate, 44- fire door, 91- superheater, 92- exhaust valve. DETAILED DESCRIPTION

[0025] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] See the appended Figure 1 drawings, the present invention provides a method for converting heat energy generated by air-cooled crushing of high-temperature steel slag into electricity, which includes the following steps:

[0028] Step S1. Feeding molten slag and roll-pressing and crushing. The molten slag is placed in the slag pot 1 and hoisted to the slag-turning device 2 by the overhead crane. The slag-turning device 2 enters the fixed crushing bed 31 to pour out the slag and transports the empty slag pot 1 out. The fireproof door 44 is closed, and the slag breaker 32 solidifies and crushes the molten slag until it is no longer sticky.

[0029] Step S2. Blowing air to cool the high-temperature solid slag. The slag breaker 32 pushes the crushed high-temperature solid slag into the fixed air-cooling bed 41. The slag material is static, and the blower 42 blows in normal-temperature air to cool the slag material and discharge the high-temperature flue gas.

[0030] Step S3. Recovering waste heat to generate steam and generating electricity by steam energy storage. The high-temperature flue gas exchanges heat to generate steam. The solid slag enters the stabilization treatment device 6 to exchange heat to generate steam. The steam output from the waste heat recovery device 7 and the steam purification device 8 is used for steam energy storage and power generation.

[0031] Step S4. Discharging the solid slag. After the solid slag is cooled to a certain temperature, the discharge port of the stabilization treatment device 6 is opened to discharge the slag.

[0032] Further, step S3 also includes that the high-temperature flue gas exchanges heat to generate steam. The high-temperature flue gas discharged from the fixed air-cooling bed 41 enters the waste heat recovery device 7 to release heat, and the cooling water absorbs the heat to generate steam.

[0033] Further, step S3 further includes that the solid slag enters the stabilization treatment device 6 for heat exchange to generate steam. The solid slag is transported to the stabilization treatment device 6 via the transfer device 5. The cooling water absorbs heat to generate dust-containing steam, which enters the steam purification device 8.

[0034] Further, step S3 further includes that the steam output from the waste heat recovery device 7 and / or the steam purification device 8 enters the heat storage device 9. 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.

[0035] See the appendix Figure 2 The present invention also provides a high-temperature steel slag air-cooling crushing heat energy conversion power generation device for performing the above-mentioned high-temperature steel slag air-cooling crushing heat energy conversion power generation, including a slag tank 1, a slag turning device 2, a slag breaking device 3, an air-cooling device 4, a transfer device 5, a stabilization treatment device 6, a waste heat recovery device 7, a steam purification device 8, a heat storage device 9, and a power generation device 10. The slag turning device 2 is disposed on one side outside the air-cooling device 4 and can enter and exit. The slag breaking device 3 is disposed inside the air-cooling device 4. The transfer device 5 is connected to transfer the air-cooling device 4 and the stabilization treatment device 6. The waste heat recovery device 7 is connected to the air-cooling device 4 and the heat storage device 9. The steam purification device 8 is connected to the stabilization treatment device 6 and the heat storage device 9. The heat storage device 9 is connected to the power generation device 10. 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. The steam output from the waste heat recovery device 7 and / or the steam purification device 8 enters the heat storage device 9.

[0036] Further, a dust removal system 11 is further included, and the dust removal system 11 is connected to the waste heat recovery device 7 and the air-cooling device 4.

[0037] Further, a control system 12 is further included, and the control system 12 is respectively connected in a controlled manner to the slag turning device 2, the slag breaking device 3, the air-cooling device 4, the transfer device 5, the stabilization treatment device 6, the waste heat recovery device 7, the steam purification device 8, the heat storage device 9, the power generation device 10, and the dust removal system 11.

[0038] Further, the slag breaking device 3 includes a fixed crushing bed 31 and a slag breaker 32. The slag breaker 32 is disposed on the fixed crushing bed 31. The fixed crushing bed 31 is laid with steel plates, the lower part of the steel plates is filled with castable, and the upper part of the steel plates is laid with a steel slag cushion layer.

[0039] Further, 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 disposed on one side of the air-cooling device 4 and can be opened and closed. The grooved grate 43 is laid on the fixed air-cooling bed 41, and the lower part of the fixed air-cooling bed 41 is connected to the blower 42.

[0040] 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.

[0041] Furthermore, the roller shaft of the slag breaker 32 needs to be cooled by passing water, and the cooling water used is fresh industrial water.

[0042] Furthermore, steel plates are laid on the fixed crushing bed 31, refractory castable is filled below the steel plates, and a steel slag cushion layer is laid above the steel plates. Both the steel slag cushion layer and the refractory castable play a role in heat insulation and protection, reducing the structural damage of the bed body caused by high temperature.

[0043] Furthermore, groove grate plates 43 are laid on the fixed air-cooling bed 41. The groove grate plates 43 are designed with a labyrinth ventilation to ensure no material leakage during the slag handling process. Among them, the slag stays on the fixed air-cooling bed 41 for 15 min - 20 min. During this process, the residual heat of the slag is exchanged with the normal-temperature air blown in by the blower 42. The temperature of the cooled slag is about 600°C - 800°C, and the temperature of the exhausted high-temperature flue gas is about 450°C.

[0044] Furthermore, the stabilization treatment device 6 includes a spray head, a locking device, and an exhaust pipe. The stabilization treatment device 6 passes in normal-temperature cooling water and discharges the dust-containing steam.

[0045] Furthermore, a superheater 91 is provided in the heat storage device 9, and the superheat degree of the steam can reach 50°C - 100°C. Among them, the discharging temperature of the slag is about 60°C - 100°C.

[0046] 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. Among them, the dust removal system 11 is connected to the waste heat recovery device 7 to collect dust and achieve ultra-low emissions. The cooling water used in the waste heat recovery device 7 is demineralized water.

[0047] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0048] The foregoing description of the disclosed embodiments enables those skilled in the art to practice 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. Thus, the present invention is not intended 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 method for converting the thermal energy generated by air-cooled crushing of high-temperature steel slag into electricity, characterized in that, It includes the following steps: Step S1. Feeding molten slag, rolling and crushing. The molten slag is placed in the slag pot (1), lifted by the overhead crane to the slag turning device (2). The slag turning device (2) dumps the slag into the fixed crushing bed (31) and transports the empty slag pot (1) out. The fireproof door (44) is closed, and the slag breaker (32) crushes the molten slag into a non-sticky state. Step S2. Blowing air to cool the high-temperature solid slag. The slag breaker (32) pushes the crushed high-temperature solid slag into the fixed air-cooling bed (41). The slag material is static, and the blower (42) blows in normal-temperature air to cool the slag material and discharge the high-temperature flue gas. Step S3. Recycling waste heat to generate steam and generating electricity by steam energy storage. The high-temperature flue gas exchanges heat to generate steam. The solid slag enters the stabilization treatment device (6) to exchange heat and generate steam. The steam output from the waste heat recovery device (7) and / or the steam purification device (8) is used for steam energy storage power generation. Step S4. Discharging the solid slag. After the solid slag is cooled to a certain temperature, the discharge port of the stabilization treatment device (6) is opened to discharge the slag.

2. The method for converting heat energy generated by air-cooled crushing of high-temperature steel slag according to claim 1, characterized in that, Step S3 further includes that the high-temperature flue gas exchanges heat to generate steam. The high-temperature flue gas discharged from the fixed air-cooling bed (41) enters the waste heat recovery device (7), releases heat, and the cooling water absorbs the heat to generate steam.

3. A method for converting thermal energy generated by air-cooling and crushing of high-temperature steel slag according to claim 2, characterized in that, Step S3 further includes that the solid slag enters the stabilization treatment device (6) to exchange heat and generate steam. The solid slag is transported to the stabilization treatment device (6) via the transfer device (5). The cooling water absorbs heat to generate dusty steam, which enters the steam purification device (8).

4. A method for converting thermal energy generated by air-cooled crushing of high-temperature steel slag into electricity according to claim 3, characterized in that, Step S3 further includes that the steam output from the waste heat recovery device (7) and / or the steam purification device (8) enters the heat storage device (9). When the steam pressure in the device reaches a certain threshold, the exhaust valve (92) opens, and the superheated pressure steam pushes the power generation device (10) to generate electricity.

5. A high-temperature steel slag air-cooling crushing heat energy conversion power generation device, which is used for the high-temperature steel slag air-cooling crushing heat energy conversion power generation method described in any one of claims 1-4, and includes a slag pot (1), a slag turning device (2), a slag crushing device (3), an air-cooling device (4), a transfer device (5), a stabilization treatment device (6), a waste heat recovery device (7), a steam purification device (8), a heat storage device (9), and a power generation device (10), characterized in that, The slag turning device (2) is disposed on the outer side of the air-cooling device (4) and can enter and exit. The slag breaking device (3) is disposed inside the air-cooling device (4). The transfer device (5) is transfer-connected to the air-cooling device (4) and the stabilization treatment device (6). The waste heat recovery device (7) is connected to the air-cooling device (4) and the heat storage device (9). The steam purification device (8) is connected to the stabilization treatment device (6) and the heat storage device (9). The heat storage device (9) is connected to the power generation device (10). The slag pot (1) can enter and exit the air-cooling device (4) and the slag breaking device (3) through the slag turning device (2). The steam output from the waste heat recovery device (7) and / or the steam purification device (8) enters the heat storage device (9).

6. The high-temperature steel slag air-cooled crushing heat energy conversion power generation device according to claim 5, characterized in that It further includes a dust removal system (11), and the dust removal system (11) is connected to the waste heat recovery device (7) and the air-cooling device (4).

7. A high-temperature steel slag air-cooled crushing thermal energy conversion power generation device according to claim 5, characterized in that, It further includes a control system (12), and the control system (12) is respectively connected to the slag turning device (2), the slag breaking device (3), the air-cooling device (4), the transfer device (5), the stabilization treatment device (6), the waste heat recovery device (7), the steam purification device (8), the heat storage device (9), the power generation device (10), and the dust removal system (11) for control.

8. A high-temperature steel slag air-cooled crushing thermal energy conversion power generation device according to claim 5, characterized in that, The slag breaking device (3) includes a fixed crushing bed (31) and a slag breaker (32). The slag breaker (32) is arranged on the fixed crushing bed (31). The fixed crushing bed (31) is paved with steel plates, the lower part of the steel plates is filled with castable, and a steel slag cushion layer is paved on the upper part of the steel plates.

9. The high-temperature steel slag air-cooled crushing heat energy conversion power generation device according to claim 5, characterized in that, The air cooling device (4) includes a fixed air cooling bed (41), a blower (42), a grooved grate plate (43), and a fire door (44). The fire door (44) is arranged on one side of the air cooling device (4) in an openable and closable manner. The grooved grate plate (43) is paved on the fixed air cooling bed (41), and the blower (42) is connected to the lower part of the fixed air cooling bed (41).

10. A high-temperature steel slag air-cooled crushing thermal energy conversion power generation device according to claim 5, characterized in that, An overheater (91) is arranged in the heat storage device (9), and an exhaust valve (92) is arranged between the heat storage device (9) and the power generation device (10).

Images