Groove type high-temperature molten steel slag waste heat utilization device

Abstract

The utility model relates to steel slag waste heat recovery technical field, concretely relates to a groove type high temperature molten steel slag waste heat utilization device, it includes: horizontal tank, crushing assembly, radiation heat exchange component and gas -liquid separator, wherein, horizontal tank can swing and rotate around its axis reciprocating, crushing assembly, radiation heat exchange component and gas -liquid separator are fixed immovably, horizontal tank is used to contain high temperature steel slag, radiation heat exchange component is located above crushing assembly, the reciprocating swing of horizontal tank makes the relative motion of inside steel slag and crushing assembly to the steel slag is broken and agitated, radiation heat exchange component is used to absorb the radiation heat of steel slag, and produces steam through with the water vapor exchange of gas -liquid separator. The embodiment of the utility model integrates three functions of the cooling of steel slag, crushing and production superheated steam in single equipment, and steel slag cooling crushing process does not contact with water directly.

Description

Technical Field

[0001] This utility model relates to the field of steel slag waste heat recovery technology, specifically to a trough-type high-temperature molten steel slag waste heat utilization device. Background Technology

[0002] In the steel metallurgical process, a large amount of high-temperature molten steel slag with temperatures exceeding 1300℃ is generated. Currently, the commonly used steel slag treatment methods in the industry, such as hot pouring, pool quenching, or drum quenching, mainly focus on cooling and solidifying the steel slag to facilitate subsequent processing. These methods mostly have the following drawbacks: First, the huge amount of high-temperature sensible heat resources contained in the steel slag are not effectively recovered, resulting in serious energy waste; second, many processes (especially water quenching) require a large amount of water resources and generate water vapor carrying a large amount of dust during the cooling process, causing pollution to the atmospheric environment, and also placing a heavy burden and high operating costs on the company's environmental protection facilities.

[0003] Therefore, developing a technology and equipment that can efficiently and environmentally process high-temperature molten steel slag and recover its high-grade heat energy during the process is of great significance for energy conservation, emission reduction and sustainable development in the steel industry. Utility Model Content

[0004] The purpose of this invention is to provide a trough-type high-temperature molten steel slag waste heat utilization device, which aims to solve the problems of low steel slag waste heat recovery efficiency, large water consumption, and easy generation of secondary pollution in the existing technology.

[0005] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution:

[0006] A trough-type high-temperature molten steel slag waste heat utilization device includes: a horizontal trough body capable of reciprocating swing and rotation around its axis;

[0007] In addition, the following components are located inside the horizontal tank and fixedly connected to the frame: the crushing assembly and the radiant heat exchange assembly;

[0008] And, a gas-liquid separator is installed outside the horizontal tank and fixedly connected to the frame;

[0009] in,

[0010] The horizontal tank is used to contain high-temperature steel slag. The radiant heat exchange component is located above the crushing component. The reciprocating swing of the horizontal tank causes relative motion between the steel slag inside and the crushing component, thereby crushing and agitating the steel slag. The radiant heat exchange component is used to absorb the radiant heat of the steel slag to generate steam, and generates saturated steam or superheated steam through water vapor exchange with the gas-liquid separator.

[0011] Furthermore, the horizontal tank includes those with a semi-circular cross-section:

[0012] The lower tank can reciprocate and rotate around its axis.

[0013] The upper cover is located above the lower groove and is fixedly connected to the frame.

[0014] Furthermore, the lower groove has driven shafts connected to both ends of its axis. The driven shafts are supported on multiple sets of support wheels. One of the driven shafts has an annular gear ring on its outer wall. The annular gear ring meshes with a gear driven by a motor reducer, thereby driving the lower groove to reciprocate and rotate.

[0015] Furthermore, the diameter of the upper cover is smaller than the diameter of the lower trough, so that when the lower trough rotates to discharge slag, its movement trajectory does not interfere with the upper cover.

[0016] Furthermore, the lower tank and / or the upper cover can be supplied with ambient temperature water as cooling water and output the cooling water to the inlet of the gas-liquid separator, thereby constituting an economizer.

[0017] Furthermore, the lower tank has an internal jacket for introducing cooling water, and the upper cover is an arc-shaped water-cooled film wall. The cooling water passes through the lower tank, the upper cover, and the inlet of the gas-liquid separator.

[0018] Furthermore, the radiative heat exchange assembly includes an evaporation section and a superheating section;

[0019] The inlet of the evaporation section is connected to the liquid outlet of the gas-liquid separator, and its outlet is connected to the gas-liquid mixture inlet of the gas-liquid separator, forming an evaporation circulation loop;

[0020] The inlet of the superheated section is connected to the gas outlet of the gas-liquid separator, and its outlet is used to output superheated steam.

[0021] Furthermore, it also includes:

[0022] A temperature sensor, installed inside the horizontal tank, is used to monitor the temperature of the steel slag.

[0023] A working fluid parameter sensor is installed on the outlet pipe of the superheated section to monitor the parameters of the superheated steam.

[0024] A three-way valve is installed on the steam pipe between the gas-liquid separator and the superheated section;

[0025] The controller, electrically connected to the temperature sensor, working fluid parameter sensor, and three-way valve, is used to control the three-way valve to operate when the temperature or pressure of the superheated steam is lower than the set value, so that the saturated steam is transported through a bypass to the superheated section of another trough-type high-temperature molten steel slag waste heat utilization device to produce superheated steam.

[0026] Furthermore, the crushing components include:

[0027] The crossbeam is arranged along the axial direction of the horizontal tank and fixedly connected to the frame, and has an internal channel for cooling water to enter.

[0028] Several crushing teeth are fixed on the crossbeam and are used to move relative to the steel slag, thereby crushing and agitating the steel slag.

[0029] Compared with the prior art, this application has the following advantages:

[0030] The embodiments of this utility model integrate the three functions of cooling, crushing and producing superheated steam of steel slag into a single device, which significantly simplifies the processing flow and equipment footprint. Furthermore, the steel slag cooling and crushing process does not come into direct contact with water, thus avoiding the large amount of dust-laden steam generated by the water quenching method, saving water resources and reducing environmental treatment costs. Attached Figure Description

[0031] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0032] Figure 1 This is a front view of an embodiment of the present utility model. The lower groove in the figure is transparent, and the transparent components inside are shown by dashed lines.

[0033] Figure 2 This is a sectional view of the longitudinal section of an embodiment of the present utility model;

[0034] Figure 3 This is a cross-sectional view of an embodiment of the present utility model, showing the slag feeding condition;

[0035] Figure 4 This is a cross-sectional view of an embodiment of the present invention, showing the heat exchange and crushing conditions.

[0036] Figure 5 This is a cross-sectional view of an embodiment of the present utility model, showing the slag discharge condition.

[0037] Figure 6This is a system diagram of two devices operating in parallel according to an embodiment of the present invention, showing the intelligent collaborative control mode.

[0038] The labels in the diagram represent the following:

[0039] 1-Lower tank; 11-Driven shaft; 12-Annular gear ring; 2-Upper cover; 3-Support wheel; 4-Crossbeam; 5-Crushing tooth; 6-Evaporation section; 7-Superheating section; 8-Gas-liquid separator; 81-Downcomer; 82-Upcomer; 9-Three-way valve; 91-Bypass. Detailed Implementation

[0040] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] The present invention provides a trough-type high-temperature molten steel slag waste heat utilization device, which aims to integrate the cooling, crushing and efficient waste heat recovery functions of high-temperature steel slag into a single device, hereinafter referred to as "the device".

[0042] All major components of the device are installed or fixed on a unified frame, which provides structural support and positioning reference for the device. The device mainly includes: a horizontal tank, crushing components and radiant heat exchange components installed inside the horizontal tank, and a gas-liquid separator 8 (boiler drum) installed outside the horizontal tank.

[0043] (Steel slag load-bearing and crushing structures)

[0044] The horizontal tank is the main structure for processing steel slag. It consists of a lower tank 1 that can move around an axis and an upper cover 2 that is fixed. Together, they form a basically enclosed processing space.

[0045] The lower tank 1 is a horizontal container with a semi-circular cross-section. Its shell has a double-layer jacket design, forming a closed jacket for the introduction of cooling water.

[0046] To enable the movement of the lower tank 1, a concentric driven shaft 11 is rigidly connected to each end of its axis. These two driven shafts 11 are placed on multiple sets of support wheels 3 to bear the entire weight of the lower tank 1 and the steel slag inside.

[0047] A ring gear 12 is machined or fixed on the outer wall of one of the driven shafts 11. The ring gear 12 meshes with a drive gear driven by a motor reducer (not shown in the figure) to form a drive mechanism. By controlling the speed and direction of the motor, the lower tank 1 can be precisely driven to reciprocate at a small angle, or rotate at a large angle when slag needs to be discharged.

[0048] The upper cover 2 is also an independent top cover with a semi-circular cross-section. Its structure is an arc-shaped water-cooled film wall. It is fixed to the frame by an independent support arm and is located directly above the lower tank 1.

[0049] To ensure that the movement trajectory of the lower tank 1 does not mechanically interfere with the upper cover 2 when it rotates at a large angle to discharge slag, the diameter of the upper cover 2 is designed to be smaller than the diameter of the lower tank 1.

[0050] It should be further explained that the end caps of the horizontal tank can be a complete circle and formed entirely at both ends of the lower tank 1; or they can be two semicircles and formed at both ends of the lower tank 1 and the upper cover 2, respectively.

[0051] The crushing assembly is fixedly installed in the central area inside the horizontal tank and does not rotate with the tank. It mainly includes: a crossbeam 4 and several crushing teeth 5 fixed on it.

[0052] The two ends of the crossbeam 4 pass through the center hole of the driven shaft 11 and are firmly fixed to the frame. The crossbeam 4 is a square or round tube arranged along the axial direction of the horizontal tank, and its interior is provided with a channel for cooling water to enter.

[0053] The crushing teeth 5 are fixed to the crossbeam 4 by bolts or welding. When the lower tank 1 containing steel slag swings, the steel slag and the fixed crushing teeth 5 undergo continuous relative motion, thereby being effectively crushed and agitated.

[0054] (Structure for waste heat recovery of steel slag)

[0055] The interlayer of the lower tank 1 and the water-cooled film wall of the upper cover 2 together form a series economizer (not shown in the figure), and its water connection method is as follows:

[0056] The softened water at room temperature first enters the interlayer of the lower tank 1 to absorb the conductive heat of the steel slag for the first stage of preheating. The hot water flowing out of the interlayer is then guided to the inlet of the water-cooled membrane wall of the upper cover 2 to absorb some of the radiant and convective heat for the second stage of deep preheating. Finally, the high-temperature hot water flowing out of the water-cooled membrane wall outlet is supplied as makeup water to the inlet of the gas-liquid separator 8.

[0057] The radiant heat exchanger is suspended above the crushing assembly and above the molten steel slag, and is fixedly connected to the frame. It is used to absorb the radiant heat of the high-temperature steel slag. The radiant heat exchanger includes multiple sets of heat exchange tubes, each set of heat exchange tubes is divided into an evaporation section 6 and a superheating section 7.

[0058] Evaporation section 6: Its inlet is connected to the liquid outlet of the gas-liquid separator 8 through the downcomer 81, and its outlet is connected to the gas-liquid mixture inlet of the gas-liquid separator 8 through the riser 82, together with the gas-liquid separator 8, forming a natural evaporation cycle loop.

[0059] Superheated section 7: Its inlet is connected to the gas outlet (i.e. saturated steam outlet) of gas-liquid separator 8, and its outlet is used to output the final product - superheated steam to the outside world (e.g., steam turbine).

[0060] The gas-liquid separator 8 is preferably a horizontal boiler drum, independently supported on a frame and completely outside the rotation range of the horizontal tank. It is equipped with a high-efficiency steam-water separation device, such as a corrugated plate separator and a stainless steel wire mesh demister, to ensure that the output saturated steam has a qualified dryness.

[0061] (Multi-unit coordinated control)

[0062] One important embodiment of the present invention is a system that uses at least two of the above-mentioned devices operating in parallel. The system also includes a set of cooperative control components for optimizing the steam quality of the entire system.

[0063] The collaborative control components include: sensors, three-way valve 9, and controller.

[0064] Each unit has an infrared temperature sensor installed in its horizontal tank to monitor the temperature of its slag. Each unit also has a working fluid parameter sensor installed on the outlet pipe of the superheated section 7 to measure the steam temperature and pressure.

[0065] An electric or pneumatic three-way valve 9 is installed on the steam pipe between the gas-liquid separator 8 and the superheated section 7 of each device. The two ends of the three-way valve 9 are connected to the gas-liquid separator 8 and the superheated section 7 respectively, and the remaining end of the three-way valve 9 is connected to the three-way valve 9 of another device.

[0066] A controller is electrically connected to all the sensors and three-way valve 9 of the device. The three-way valve 9 is a T-type ball valve that can connect any two ports or three ports.

[0067] Workflow:

[0068] Step 1, Slag Feeding: High-temperature liquid steel slag (approximately 1300℃) is transferred to the device and injected into the lower tank 1 through the hopper.

[0069] Step 2, heat exchange and crushing: The drive mechanism starts, causing the lower tank 1 to reciprocate at a small angle and a set frequency. The steel slag in the tank moves relative to the fixed crushing teeth 5 and is continuously crushed and agitated during the cooling and solidification process. At the same time, the economizer generates hot water to feed into the gas-liquid separator 8. The gas-liquid separator 8 transports saturated water to the evaporation section 6 through the downcomer 81. The steam-water mixture generated by the evaporation section 6 absorbing radiant heat returns to the gas-liquid separator 8 through the riser 82. The saturated steam separated from the steam-water mixture enters the superheated section 7, is heated into superheated steam, and is then output.

[0070] Step 3, Intelligent Collaborative Control: When multiple units are running in parallel, the controller monitors the slag temperature and superheated steam parameters of each unit in real time. Assuming that the slag in the first unit has been processed for a period of time and its temperature drops, causing the temperature or pressure of the superheated steam it produces to be lower than the set value, the controller will determine that the radiant heat of the first unit is insufficient to efficiently produce high-quality superheated steam. The controller will then issue a command to control the three-way valve 9 of the first unit to bypass the saturated steam generated by its gas-liquid separator 8 to the inlet of the superheated section 7 of another second unit that is processing high-temperature slag. This allows the saturated steam of the first unit to be effectively heated into qualified superheated steam in the second unit, thereby maximizing the utilization of the total heat of the entire system and ensuring the stability of the total output superheated steam flow and quality of the system.

[0071] Step 4, slag discharge: When the temperature sensor detects that the temperature of the steel slag in a single unit has dropped to a preset final temperature, the drive mechanism of the unit stops swinging and instead drives the lower tank 1 to rotate at a large angle, so that the solid steel slag that has become granular can be smoothly discharged from the tank. After being emptied, the unit can be ready to receive the next batch of high-temperature steel slag and enter a new working cycle.

[0072] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of this utility model.

Claims

1. A trough-type high-temperature molten steel slag waste heat utilization device, Its features are, Includes: a horizontal tank capable of reciprocating and rotating around its axis; In addition, the following components are located inside the horizontal tank and fixedly connected to the frame: the crushing assembly and the radiant heat exchange assembly; And, a gas-liquid separator (8) is installed outside the horizontal tank and fixedly connected to the frame; in, The horizontal tank is used to contain high-temperature steel slag. The radiant heat exchange component is located above the crushing component. The reciprocating swing of the horizontal tank causes the steel slag inside to move relative to the crushing component, thereby crushing and agitating the steel slag. The radiant heat exchange component is used to absorb the radiant heat of the steel slag to generate steam, and to generate saturated steam or superheated steam by exchanging steam with the water vapor of the gas-liquid separator (8).

2. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 1, characterized in that, Horizontal tanks include those with a semi-circular cross-section: The lower tank (1) is capable of reciprocating oscillation and rotation around its axis. The upper cover (2) is located above the lower groove (1) and is fixedly connected to the frame.

3. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 2, characterized in that, The lower groove (1) has driven shafts (11) connected to both ends of its axis. The driven shafts (11) are supported on multiple sets of support wheels (3). One of the driven shafts (11) has an annular gear ring (12) on its outer wall. The annular gear ring (12) meshes with a gear driven by a motor reducer, thereby driving the lower groove (1) to reciprocate and rotate.

4. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 2 or 3, characterized in that, The diameter of the upper cover (2) is smaller than the diameter of the lower tank (1), so that when the lower tank (1) rotates to discharge slag, its movement trajectory does not interfere with the upper cover (2).

5. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 2, characterized in that, The lower tank (1) and / or the upper cover (2) can input external ambient temperature water as cooling water and output the cooling water to the inlet of the gas-liquid separator (8), thereby constituting an economizer.

6. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 5, characterized in that, The lower tank (1) has an internal jacket for introducing cooling water, and the upper cover (2) is an arc-shaped water-cooled film wall. The cooling water passes through the lower tank (1), the upper cover (2) and the inlet of the gas-liquid separator (8).

7. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 1, characterized in that, The radiative heat exchange assembly includes an evaporation section (6) and a superheating section (7); The inlet of the evaporation section (6) is connected to the liquid outlet of the gas-liquid separator (8), and its outlet is connected to the gas-liquid mixture inlet of the gas-liquid separator (8) to form an evaporation loop. The inlet of the superheated section (7) is connected to the gas outlet of the gas-liquid separator (8), and its outlet is used to output superheated steam.

8. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 7, characterized in that, Also includes: A temperature sensor, installed inside the horizontal tank, is used to monitor the temperature of the steel slag. A working fluid parameter sensor is installed on the outlet pipe of the superheated section (7) to monitor the parameters of the superheated steam; A three-way valve is installed on the steam pipe between the gas-liquid separator (8) and the superheated section (7); The controller is electrically connected to the temperature sensor, the working fluid parameter sensor, and the three-way valve. When the temperature or pressure of the superheated steam is lower than the set value, the controller controls the three-way valve to operate, so that the saturated steam is transported through a bypass (91) to the superheat section (7) of another trough-type high-temperature molten steel slag waste heat utilization device to produce superheated steam.

9. The trough-type high-temperature molten steel slag waste heat utilization device according to claim 1, characterized in that, The crushing components include: A crossbeam (4) is arranged along the axial direction of the horizontal tank and fixedly connected to the frame, and has a channel inside for passing cooling water. Several crushing teeth (5) are fixed on the crossbeam (4) for relative movement with the steel slag, thereby crushing and agitating the steel slag.

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