A high-temperature solid-state steel slag sensible heat recovery device
By designing a vertical waste heat boiler and a multi-stage water-cooled wall heat exchanger, the problems of high water consumption and dust-laden steam in high-temperature steel slag treatment were solved, achieving efficient sensible heat recovery and steam production, and reducing the company's energy consumption and costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 张英辰
- Filing Date
- 2025-07-07
- Publication Date
- 2026-07-24
AI Technical Summary
Existing high-temperature steel slag treatment technologies consume a large amount of water and generate a large amount of dust-laden steam, increasing the workload and energy consumption of dust removal.
A vertical waste heat boiler and heat exchange mechanism are adopted. High-temperature solid steel slag falls by gravity and absorbs heat during the falling process. Using a gas-water separator and a multi-stage water-cooled wall heat exchanger, direct contact with water is avoided, and superheated steam is generated and sensible heat is recovered.
It reduces water consumption and dust removal workload, improves heat exchange efficiency, lowers production costs, and provides high-quality steam for power generation and other applications.
Smart Images
Figure CN224551507U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of sensible heat recovery equipment in iron and steel smelting, and specifically discloses a sensible heat recovery device for high-temperature solid steel slag. Background Technology
[0002] The steel industry, as a crucial pillar of my country's economy, holds a vital position. Within the energy economy, the steel sector also plays a pivotal role. Blast furnace slag, the most significant byproduct of steel production, accounts for approximately 50% of the industry's total waste. It also possesses substantial high-quality waste heat; the calorific value of one ton of blast furnace slag is equivalent to 60 kg of standard coal. However, improper disposal of blast furnace slag not only occupies significant land resources but also poses a risk of polluting soil, groundwater, and air, causing profound environmental impacts. Therefore, the recovery and utilization of blast furnace slag waste heat resources plays a crucial role in energy conservation, carbon reduction, and emission reduction in the steel industry. Research on the comprehensive utilization of blast furnace slag has become an indispensable part of metallurgical industry research.
[0003] Specifically, during steel production, approximately 10-15% steel slag is generated per ton of steel, with temperatures reaching 1200-1600℃. Traditionally, steel slag is disposed of by cold cooling, which not only wastes heat energy but also generates dust pollution. Given the significant heat energy contained within steel slag, effectively recovering and utilizing this energy can greatly reduce energy consumption. High-temperature steel slag waste heat recovery technology primarily uses heat exchangers to transfer the heat energy from the high-temperature steel slag to water or other media, thereby generating steam or hot water for heating, power generation, or other industrial applications. Under the backdrop of energy conservation and emission reduction, the development of new high-temperature steel slag waste heat recovery technologies by steel production enterprises has broad application prospects in steel production processes. For example, waste heat recovery can provide the necessary heat energy for steel production, reducing fuel consumption and lowering production costs. Waste heat recovery can also be used for power generation, converting the heat energy in high-temperature steel slag into electrical energy, improving the self-sufficiency of steel plants. Furthermore, waste heat recovery can also be used in heating and cooling, providing steel plants with multiple energy options.
[0004] Specifically, commonly used heat recovery technologies include hot pouring, pool quenching, roller method, and pressurized or atmospheric pressure roller hot crushing process. These water quenching processes consume a large amount of water resources. In particular, the roller hot crushing process generates a large amount of dust-laden water vapor by spraying a large amount of water into the high-temperature molten steel slag for cooling, which greatly increases the workload of dust removal and results in high energy consumption, increasing the production costs of enterprises. Utility Model Content
[0005] This invention provides a sensible heat recovery device for high-temperature solid steel slag to solve the technical problem that water quenching processes consume large amounts of water and generate a large amount of dust-containing steam.
[0006] The aforementioned sensible heat recovery device for high-temperature solid steel slag includes a vertical waste heat boiler, a heat exchange mechanism, and a gas-water separator. The upper end of the vertical waste heat boiler is the steel slag inlet, and the lower end is the steel slag outlet. The heat exchange mechanism is installed inside the vertical waste heat boiler, located between the steel slag inlet and the steel slag outlet, and is provided with multiple vertical steel slag flow channels. The gas-water separator is provided with a saturated steam outlet, which is connected to the heat exchange mechanism. The heat exchange mechanism is used to absorb the heat of the steel slag in the steel slag flow channels and use the heat of the steel slag to heat the saturated steam into superheated steam.
[0007] In the aforementioned high-temperature solid steel slag sensible heat recovery device, the gas-water separator is also equipped with a return water inlet, a gas-water mixture inlet, and a water supply inlet. The heat exchange mechanism is divided into three independent sections from top to bottom: a superheating section, an evaporation section, and a heating section. Each section includes multiple sets of water-cooled wall heat exchangers arranged horizontally. The gap between two adjacent sets of water-cooled wall heat exchangers serves as a steel slag flow channel. Each set of water-cooled wall heat exchangers includes two baffles and multiple working fluid flow pipes fixed between the two baffles. The superheating section also includes an inlet pipe, a gas dispersion chamber, a gas collection chamber, and an exhaust pipe. The working fluid flow pipes in the superheating section are arranged horizontally. The inlets of all working fluid flow pipes are connected to the gas dispersion chamber, and the outlets of all working fluid flow pipes are connected to the gas collection chamber. The inlet pipe passes through a vertical waste heat boiler and connects to the gas dispersion chamber. The evaporation section includes a chamber and a saturated steam outlet. The exhaust pipe passes through the vertical waste heat boiler and connects to the gas collection chamber. The water-cooled wall heat exchangers in the evaporation and heating sections also include a working fluid inlet pipe and a working fluid outlet pipe. The inlets of the working fluid flow pipes are all connected to the working fluid inlet pipes, and the outlets of the working fluid flow pipes are all connected to the working fluid outlet pipes. The working fluid flow pipes in the evaporation and heating sections are vertically arranged. The evaporation section also includes a return water pipe and a gas-water mixture pipe. The return water pipe passes through the vertical waste heat boiler and connects to the return water inlet and all working fluid inlet pipes. The gas-water mixture pipe passes through the vertical waste heat boiler and connects to the gas-water mixture inlet and all working fluid outlet pipes. The heating section also includes a water inlet pipe and a water outlet pipe. The water inlet pipe passes through the vertical waste heat boiler and connects to all working fluid inlet pipes. The water outlet pipe passes through the vertical waste heat boiler and connects to the water supply inlet and all working fluid outlet pipes.
[0008] In the aforementioned sensible heat recovery device for high-temperature solid steel slag, a mixing agitator is installed between two adjacent sets of water-cooled wall heat exchangers in the evaporation section and the heating section. The mixing agitator includes a mixing shaft and blades fixed on the mixing shaft. Both ends of the mixing shaft are rotatably connected to a vertical waste heat boiler and are driven to rotate by a motor.
[0009] Preferably, in the evaporation section and the heating section, multiple mixing agitators are provided between two adjacent sets of water-cooled wall heat exchangers.
[0010] In the aforementioned sensible heat recovery device for high-temperature solid steel slag, a drive sprocket is rotatably installed at the position corresponding to the evaporation section and the heating section outside the vertical waste heat boiler; in the evaporation section and the heating section, a driven sprocket is fixedly installed at the end of each stirring shaft located outside the vertical waste heat boiler, the drive sprocket and multiple driven sprockets are connected by a chain, and the drive sprocket is driven to rotate by a motor.
[0011] In the aforementioned high-temperature solid steel slag sensible heat recovery device, tensioning wheels are rotatably installed on the outside of the vertical waste heat boiler at positions corresponding to the evaporation section and the heating section; in the evaporation section and the heating section, the driving sprocket, the tensioning wheel, and multiple driven sprockets are connected by chains.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] The aforementioned high-temperature solid steel slag sensible heat recovery device allows the high-temperature steel slag to fall naturally under gravity. During the fall, the heat is absorbed by the heat exchange mechanism. The high-temperature steel slag does not directly contact water during the cooling process, avoiding the problem of generating a large amount of dust-laden steam in water quenching. This greatly reduces the amount of dust removal work and the energy consumption caused by dust removal. Moreover, the large heat exchange area can effectively recover the sensible heat of the steel slag, providing high-quality steam for enterprises, reducing costs, and saving water resources. Attached Figure Description
[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of a sensible heat recovery device for high-temperature solid steel slag.
[0016] Figure 2 This is a schematic diagram of the structure of the water-cooled wall heat exchanger and the mixing agitator in the evaporation section and the heating section.
[0017] In the diagram: 1-Vertical waste heat boiler; 2-Gas-water separator; 3-Slag flow channel; 4-Superheating section; 5-Evaporation section; 6-Heating section; 7-Water-cooled wall heat exchanger; 8-Baffle plate; 9-Working fluid flow pipe; 10-Inlet pipe; 11-Gas dispersion chamber; 12-Gas collection chamber; 13-Exhaust pipe; 14-Working fluid discharge pipe; 15-Return water pipe; 16-Gas-water mixture pipe; 17-Inlet water pipe; 18-Drain pipe; 19-Agitator shaft; 20-Blade; 21-Drive sprocket; 22-Driven sprocket; 23-Chain; 24-Tensioner. Detailed Implementation
[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on 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.
[0019] This embodiment provides a sensible heat recovery device for high-temperature solid steel slag, including a vertical waste heat boiler 1, a heat exchange mechanism, and a gas-water separator 2. The upper end of the vertical waste heat boiler 1 is a steel slag inlet, and the lower end is a steel slag outlet. The heat exchange mechanism is installed inside the vertical waste heat boiler 1, located between the steel slag inlet and the steel slag outlet, and is provided with multiple vertical steel slag flow channels 3. The gas-water separator 2 is provided with a saturated steam outlet, which is connected to the heat exchange mechanism. The heat exchange mechanism is used to absorb the heat of the steel slag in the steel slag flow channels 3 and use the heat of the steel slag to heat the saturated steam into superheated steam.
[0020] High-temperature steel slag falls within the steel slag flow channel 3. During the fall, the heat is absorbed by the heat exchange medium in the heat exchange mechanism. The heat exchange medium forms superheated steam inside the heat exchange mechanism. The superheated steam is eventually used for power generation and other purposes. The medium- and high-temperature solid steel slag is gradually cooled to the target temperature and then discharged.
[0021] In the aforementioned high-temperature solid steel slag sensible heat recovery device, the gas-water separator 2 is also equipped with a return water inlet, a gas-water mixture inlet, and a water supply inlet; the heat exchange mechanism is divided into three independent sections from top to bottom: a superheating section 4, an evaporation section 5, and a heating section 6. Each section includes multiple sets of water-cooled wall heat exchangers 7 arranged in a horizontal direction. The gap between two adjacent sets of water-cooled wall heat exchangers 7 is a steel slag flow channel 3. Each set of water-cooled wall heat exchangers 7 includes two baffles 8 and multiple working fluid flow pipes 9 fixed between the two baffles 8; the superheating section 4 also includes an inlet pipe 10, a gas dispersion chamber 11, a gas collection chamber 12, and an exhaust pipe 13. The working fluid flow pipes 9 in the superheating section are arranged horizontally. The inlets of all working fluid flow pipes 9 are connected to the gas dispersion chamber 11, and the outlets of all working fluid flow pipes 9 are connected to the gas collection chamber 12. The inlet pipe 10 passes through the vertical waste heat boiler 1 and connects the gas dispersion chamber 11 and the saturated steam. The outlet and exhaust pipe 13 pass through the vertical waste heat boiler 1 and are connected to the gas collection chamber 12; the water-cooled wall heat exchanger 7 in the evaporation section 5 and the heating section 6 also includes a working fluid inlet pipe and a working fluid outlet pipe 14. The inlet of the working fluid flow pipe 9 is connected to the working fluid inlet pipe, and the outlet of the working fluid flow pipe 9 is connected to the working fluid outlet pipe 14. The working fluid flow pipe 9 in the evaporation section 5 and the heating section 6 is set vertically; the evaporation section 5 also includes a return water pipe 15 and a gas-water mixture pipe 16. The return water pipe 15 passes through the vertical waste heat boiler 1 and connects to the return water inlet and all working fluid inlet pipes. The gas-water mixture pipe 16 passes through the vertical waste heat boiler 1 and connects to the gas-water mixture inlet and all working fluid outlet pipes 14; the heating section 6 also includes a water inlet pipe 17 and a water outlet pipe 18. The water inlet pipe 17 passes through the vertical waste heat boiler 1 and connects to all working fluid inlet pipes. The water outlet pipe 18 passes through the vertical waste heat boiler 1 and connects to the water supply inlet and all working fluid outlet pipes 14.
[0022] High-temperature, granular solid steel slag is poured into the vertical waste heat boiler 1 from the top and enters the steel slag flow channel 3. It first passes through the gaps between the water-cooled wall heat exchangers 7 in the superheating section 4, heating the saturated steam generated from the gas-water separator 2. After absorbing some heat, it passes through the gaps between the water-cooled wall heat exchangers 7 in the evaporation section 5, further heating the return water generated from the gas-water separator 2. It is then further cooled by heat absorption before passing downwards through the gaps between the water-cooled wall heat exchangers 7 in the heating section 4, continuing to heat the water inside the water-cooled wall heat exchangers 7 until the solid steel slag temperature drops to the design temperature. The superheated steam generated in the superheating section 4 is collected in the gas collection chamber 12 and discharged through the exhaust pipe 13, which can be used for power generation, etc. The steam and water mixture generated in the evaporation section 5 enters the gas-water separator 2, and the separated return water continues to enter the evaporation section 5 for reuse. This design can greatly reduce water consumption while improving heat exchange efficiency.
[0023] In the aforementioned high-temperature solid steel slag sensible heat recovery device, a mixing agitator is installed between two adjacent sets of water-cooled wall heat exchangers 7 in the evaporation section 5 and the heating section 6. The mixing agitator includes a stirring shaft 19 and blades 20 fixed on the stirring shaft 19. Both ends of the stirring shaft 19 are rotatably connected to the vertical waste heat boiler 1 and are driven to rotate by a motor. Its function is to mix the steel slag in the steel slag flow channel 3, mixing the cooled outer layer of steel slag with the high-temperature inner layer of steel slag, so that the high-temperature inner steel slag has the opportunity to contact the water-cooled wall heat exchanger 7 and be fully cooled down.
[0024] Preferably, in the evaporation section and the heating section, multiple mixing agitators are provided between two adjacent sets of water-cooled wall heat exchangers.
[0025] In the aforementioned sensible heat recovery device for high-temperature solid steel slag, a drive sprocket 21 is rotatably installed on the outside of the vertical waste heat boiler 1 at positions corresponding to the evaporation section 5 and the heating section 6. In the evaporation section 5 and the heating section 6, a driven sprocket 22 is fixedly installed at the end of each stirring shaft 19 located outside the vertical waste heat boiler 1. The drive sprocket 21 and multiple driven sprockets 22 are connected by a chain 23, and the drive sprocket 21 is driven to rotate by a motor. By driving the drive sprocket 21 with the motor, the driven sprockets 22 and the stirring shaft 19 can be driven to rotate, so that the steel slag is fully heated and falls evenly and orderly.
[0026] In the aforementioned sensible heat recovery device for high-temperature solid steel slag, tension wheels 24 are rotatably installed on the exterior of the vertical waste heat boiler 1 at positions corresponding to the evaporation section 5 and the heating section 6. In the evaporation section 5 and the heating section 6, the driving sprocket 21, the tension wheels 24, and multiple driven sprockets 22 are connected by chains 23. The tension of the chain is adjusted by adjusting the position of the tension wheels 23.
[0027] Sensible heat recovery using the aforementioned high-temperature solid steel slag sensible heat recovery device includes the following steps:
[0028] Step 1, ambient temperature water preheating and replenishment: ambient temperature water enters the heating section 6 located at the bottom of the vertical waste heat boiler 1, absorbs the heat from the solid steel slag at the tail end and is preheated into hot water. The preheated hot water passes through the working fluid discharge pipe 14, the drain pipe 18 and the water inlet in sequence and enters the gas-water separator 2 as the replenishment water for the gas-water separator 2.
[0029] Step 2, Evaporation Cycle: Water in the gas-water separator 2 enters the evaporation section 5 through the return water pipe 15. The return water absorbs heat from the solid steel slag in the middle of the evaporation section 5 and boils to form a gas-water mixture. The gas-water mixture passes through the working fluid discharge pipe 14, the gas-water mixture pipe 16, and the gas-water mixture inlet in sequence and returns to the gas-water separator 2. The gas and liquid phases inside the gas-water separator 2 are separated, and the separated liquid water re-enters the evaporation section 5 through the return water pipe 15, forming an independent and continuous evaporation cycle.
[0030] Step 3, Steam Convergence and Superheating: The saturated steam separated by the gas-water separator 2 is led out through the saturated steam outlet and enters the gas dispersion chamber 11 of the superheating section 4. It is dispersed into each working fluid flow pipe 9 and undergoes final heat exchange with the solid steel slag at the top. It is heated into superheated steam with higher thermal energy and output as the final product.
[0031] In this embodiment, the working fluid includes steam and water. Saturated steam forms superheated steam inside the working fluid flow pipe 9 of the superheated section 4. The high-temperature solid steel slag is cooled to the target temperature and then discharged. The target temperature is slightly higher than the temperature of the room temperature water input into the vertical waste heat boiler 1.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A sensible heat recovery device for high-temperature solid steel slag, characterized in that, Includes a vertical waste heat boiler, heat exchange mechanism, and gas-water separator; The upper end of the vertical waste heat boiler is a steel slag inlet, and the lower end is a steel slag outlet. The heat exchange mechanism is installed inside the vertical waste heat boiler, located between the slag inlet and the slag outlet, and is provided with multiple vertical slag flow channels. The gas-water separator is equipped with a saturated steam outlet, which is connected to a heat exchange mechanism. The heat exchange mechanism is used to absorb the heat of the steel slag in the steel slag channel and use the heat of the steel slag to heat the saturated steam into superheated steam.
2. The sensible heat recovery device for high-temperature solid steel slag according to claim 1, characterized in that, The gas-water separator is also equipped with a return water inlet, a gas-water mixture inlet, and a water supply inlet; The heat exchange mechanism is divided into three independent sections from top to bottom: superheating section, evaporation section, and heating section. Each section includes multiple sets of water-cooled wall heat exchangers arranged in a horizontal direction. The gap between two adjacent sets of water-cooled wall heat exchangers is a steel slag flow channel. Each set of water-cooled wall heat exchangers includes two partitions and multiple working fluid flow pipes fixed between the two partitions. The superheated section also includes an inlet pipe, a gas dispersion chamber, a gas collection chamber, and an exhaust pipe. The working fluid flow pipes in the superheated section are horizontally arranged. The inlets of all working fluid flow pipes are connected to the gas dispersion chamber, and the outlets of all working fluid flow pipes are connected to the gas collection chamber. The inlet pipe passes through the vertical waste heat boiler and connects to the gas dispersion chamber and the saturated steam outlet. The exhaust pipe passes through the vertical waste heat boiler and connects to the gas collection chamber. The water-cooled wall heat exchangers in the evaporation section and heating section also include a working fluid inlet pipe and a working fluid outlet pipe. The inlet of the working fluid flow pipe is connected to the working fluid inlet pipe, and the outlet of the working fluid flow pipe is connected to the working fluid outlet pipe. The working fluid flow pipes in the evaporation section and heating section are arranged vertically. The evaporation section also includes a return water pipe and a gas-water mixture pipe. The return water pipe passes through the vertical waste heat boiler and connects to the return water inlet and all working fluid inlet pipes. The gas-water mixture pipe passes through the vertical waste heat boiler and connects to the gas-water mixture inlet and all working fluid outlet pipes. The heating section also includes an inlet pipe and a drain pipe. The inlet pipe passes through the vertical waste heat boiler and is connected to all working fluid inlet pipes. The drain pipe passes through the vertical waste heat boiler and is connected to the water supply port and all working fluid outlet pipes.
3. The sensible heat recovery device for high-temperature solid steel slag according to claim 2, characterized in that, In the evaporation section and heating section, a mixing agitator is provided between two adjacent sets of water-cooled wall heat exchangers. The mixing agitator includes a mixing shaft and blades fixed on the mixing shaft. Both ends of the mixing shaft are rotatably connected to a vertical waste heat boiler and are driven to rotate by a motor.
4. The sensible heat recovery device for high-temperature solid steel slag according to claim 3, characterized in that, In the evaporation section and heating section, multiple mixing agitators are installed between two adjacent sets of water-cooled wall heat exchangers.
5. The sensible heat recovery device for high-temperature solid steel slag according to claim 3, characterized in that, The vertical waste heat boiler is equipped with drive sprockets at positions corresponding to the evaporation section and the heating section. In the evaporation section and heating section, each stirring shaft is fixedly equipped with a driven sprocket at its end outside the vertical waste heat boiler. The driving sprocket and multiple driven sprockets are connected by a chain, and the driving sprocket is driven to rotate by a motor.
6. The sensible heat recovery device for high-temperature solid steel slag according to claim 5, characterized in that, Tensioning wheels are rotatably installed on the exterior of the vertical waste heat boiler at positions corresponding to the evaporation section and the heating section; In the evaporation section and the heating section, the driving sprocket, the tensioning sprocket, and multiple driven sprockets are connected by chains.