High-temperature steel slag particle waste heat direct recovery device

Abstract

The utility model provides a direct recovery device for waste heat of high-temperature steel slag particles. The direct recovery device comprises a high-temperature material conveying assembly (1), a buffer bin (2) and a heat exchange recovery furnace (3), the buffer stock bin (2) is arranged above the heat exchange recovery furnace (3); the high-temperature material conveying assembly (1) is used for conveying steel slag into the buffer bin (2); the buffer stock bin (2) is used for feeding steel slag into the heat exchange recovery furnace (3); a heat exchange surface pipe (4) is arranged in the heat exchange recovery furnace (3); the heat exchange surface pipes are obliquely, horizontally or vertically arranged to form a steel slag runner; a hopper (5) is arranged at the bottom of the heat exchange recovery furnace (3); and the hopper (5) is used for discharging steel slag in the heat exchange recovery furnace (3). The utility model solves the problems of low recovery rate, heavy pollution and high self power consumption of the existing equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of steel slag waste heat recovery, in particular to a device for directly recovering waste heat from high-temperature steel slag particles. Background Art

[0002] As a major carbon emitter, the steel industry's carbon emissions account for 18% of the country's total carbon emissions, ranking second among all industrial categories. Therefore, achieving low-carbonization has become an important measure to promote leapfrog and high-quality development of the steel industry.

[0003] The existing methods for recovering waste heat from metallurgical slag mainly include: (1) dry granulation waste heat recovery technology, which uses a granulation device such as a turntable or drum to crush the molten metallurgical slag into fine metallurgical slag particles under the action of mechanical force. The air and the high-temperature slag particles exchange heat in a fluidized bed, and the heated air drives the waste heat boiler to generate steam for power generation; (2) wind tunnel quenching method, which uses high-pressure air to directly impact the metallurgical slag stream to crush it, and at the same time, the air and the crushed slag particles exchange heat; (3) hot stewing tank method. The above method has the following disadvantages: (1) The temperature of the metallurgical slag is high when it is discharged, and it contains huge energy. The specific heat of air is relatively low, about Cg=1.0kj / (kg*℃). Using air as the heat exchange medium to recover the heat of the metallurgical slag will inevitably cause the slag to be relatively large, which requires a fan with a large air volume to match it; (2) The metallurgical slag particles obtained by dry granulation waste heat recovery are small, and the slag particles have a low porosity in the fixed bed, moving bed and fluidized bed, resulting in a high blast air pressure, which increases the power consumption of the waste heat recovery system; (3) The fine metallurgical slag particles are blown up and entrained in the hot air, requiring additional dust removal equipment, thereby increasing the construction cost and operating cost; (4) The air quenching method seriously affects the iron recovery due to the oxidation of iron elements, and has poor economic efficiency; (5) The hot stuffy tank method has a long cooling time, and the waste heat recovery effect of the low-temperature section steel slag is poor. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a device for directly recovering waste heat from high-temperature steel slag particles, which is specifically achieved through the following technical solutions:

[0005] A device for directly recovering waste heat from high-temperature steel slag particles, comprising a high-temperature material conveying component, a buffer silo, and a heat exchange recovery furnace;

[0006] The buffer silo is arranged above the heat exchange recovery furnace; the high-temperature material conveying assembly is used to transport the steel slag into the buffer silo; the buffer silo is used to put the steel slag into the heat exchange recovery furnace; the heat exchange surface pipes are arranged in the heat exchange recovery furnace; the heat exchange surface pipes are arranged obliquely, horizontally or vertically to form a steel slag flow channel; a hopper is provided at the bottom of the heat exchange recovery furnace; the hopper is used to discharge the steel slag in the heat exchange recovery furnace.

[0007] Optionally or preferably, the high-temperature material conveying assembly includes an inclined bridge, a loading trolley and a pulley mechanism; one end of the inclined bridge is arranged below the slag breaker, and the other end of the inclined bridge is arranged above the buffer silo; the loading trolley is used to load steel slag, and the loading trolley can move from one end of the inclined bridge to the other end of the inclined bridge under the traction of the pulley mechanism.

[0008] Optionally or preferably, the high-temperature material conveying assembly includes a chain bucket conveyor; one end of the chain bucket conveyor is arranged below the slag breaker, and the other end of the chain bucket conveyor is arranged above the buffer silo; the chain bucket conveyor can transport the steel slag into the buffer silo through the chain bucket thereon.

[0009] Optionally or preferably, a conveyor belt is provided at the bottom of the hopper; a plurality of transport vehicles are arranged on the conveyor belt; the transport vehicles move along the conveyor belt, collect the steel slag discharged from the bottom of the hopper, and transport the steel slag to the location of the next process.

[0010] Optionally or preferably, one end of the heat exchange surface tube is a water inlet, and the other end is a steam outlet; the water inlet is located at the lower part of the heat exchange recovery furnace; and the steam outlet is located at the upper part of the heat exchange recovery furnace.

[0011] Optionally or preferably, an insulation structure and a refractory structure are provided on the inner wall of the heat exchange recovery furnace; the refractory structure is arranged at the innermost side of the heat exchange recovery furnace and is in contact with the steel slag; the insulation structure is arranged between the refractory structure and the inner wall of the heat exchange recovery furnace.

[0012] Optionally or preferably, the furnace wall of the heat exchange recovery furnace adopts a membrane water-cooled wall structure and is in direct contact with the steel slag.

[0013] Based on the above technical solution, the following technical effects can be produced:

[0014] The utility model provides a device for directly recovering waste heat from high-temperature steel slag particles, which adopts solid-solid heat exchange instead of traditional gas-solid heat exchange. It has high heat exchange efficiency, does not require the participation of a blower, has low equipment energy consumption, does not emit particulate matter, occupies a small area, and has low investment cost, thus solving the problems of low recovery rate, heavy pollution and high self-consumption of electricity of existing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1This is a schematic structural diagram of Example 1 of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of Example 2 of the present utility model;

[0018] Description of the accompanying drawings:

[0019] 1-high-temperature material conveying assembly, 2-buffer silo, 3-heat exchange recovery furnace, 4-heat exchange surface pipe, 5-hopper, 6-slag crusher, 7-conveyor belt, 8-transport vehicle, 101-inclined bridge, 102-charging trolley, 103-pulley mechanism, 104-chain bucket conveyor. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0021] Example 1:

[0022] like Figure 1 As shown:

[0023] This embodiment provides a device for directly recovering waste heat from high-temperature steel slag particles, comprising a high-temperature material conveying assembly 1, a buffer silo 2, and a heat exchange recovery furnace 3;

[0024] The buffer silo 2 is arranged above the heat exchange recovery furnace 3; the high-temperature material conveying assembly 1 is used to transport the steel slag into the buffer silo 2; the buffer silo 2 is used to put the steel slag into the heat exchange recovery furnace 3; the heat exchange surface pipes 4 are arranged in the heat exchange recovery furnace 3; the heat exchange surface pipes are arranged obliquely, horizontally or vertically to form a steel slag flow channel; a hopper 5 is provided at the bottom of the heat exchange recovery furnace 3; the hopper 5 is used to discharge the steel slag in the heat exchange recovery furnace 3.

[0025] This embodiment utilizes a moving packed bed for solid heat exchange and a uniform discharge method, ensuring smooth and even discharge. This increases the frequency of particle renewal on the heat exchange surface tubes and reduces the impact of stagnant and interstitial areas on heat transfer, thereby enhancing heat exchange and significantly improving the efficiency of the heating surface. This ensures effective heat transfer between the high-temperature slag solid particles and the heat exchange surface tubes as they flow through them. Furthermore, this embodiment ensures sufficient residence time for the material, allowing the sensible heat of the high-temperature slag particles to be fully absorbed by the heat exchange surface tubes, effectively utilizing the sensible heat of the high-temperature slag particles in a single heat exchange. First, the blower is shut down, reducing energy consumption. Meanwhile, the high-temperature slag particles are maintained at a temperature of 850-950°C. After being discharged through the discharge port, they are transported by conveying equipment to the device, generating high-quality, high-temperature, high-pressure superheated steam for waste heat power generation. The final discharge temperature can be controlled below 120°C. Through the high-temperature steel slag particle efficient direct waste heat recovery device + waste heat power generation cascade utilization system, the waste heat utilization efficiency is greatly improved, and the waste heat recovery rate can reach more than 90%, which has significant economic and environmental benefits.

[0026] Furthermore, in this embodiment, the high-temperature material conveying assembly 1 includes an inclined bridge 101, a loading trolley 102 and a pulley mechanism 103; one end of the inclined bridge 101 is arranged below the slag breaker 6, and the other end of the inclined bridge 101 is arranged above the buffer silo 2; the loading trolley 102 is used to load steel slag, and the loading trolley 102 can move from one end of the inclined bridge 101 to the other end of the inclined bridge 101 under the traction of the pulley mechanism 103.

[0027] Furthermore, in this embodiment, a conveyor belt 7 is provided at the bottom of the hopper 5; a plurality of transport vehicles 8 are arranged on the conveyor belt 7; the transport vehicles 8 move along the conveyor belt 7, and the transport vehicles 8 collect the steel slag discharged from the bottom of the hopper 5 and transport the steel slag to the location of the next process.

[0028] Furthermore, in this embodiment, one end of the heat exchange surface tube 4 is a water inlet, and the other end is a steam outlet; the water inlet is located at the lower part of the heat exchange recovery furnace 3; the steam outlet is located at the upper part of the heat exchange recovery furnace 3.

[0029] Furthermore, in this embodiment, an insulation structure and a refractory structure are provided on the inner wall of the heat exchange recovery furnace 3; the refractory structure is arranged at the innermost side of the heat exchange recovery furnace 3 and is in contact with the steel slag; the insulation structure is arranged between the refractory structure and the inner wall of the heat exchange recovery furnace 3.

[0030] Furthermore, in this embodiment, the high-temperature material conveying assembly 1 is provided with a heat-insulating structure to ensure minimal temperature loss of the high-temperature slag during the conveying process, thereby maximizing the use of waste heat of the high-temperature slag particles.

[0031] Furthermore, in this embodiment, the furnace wall of the heat exchange recovery furnace adopts a membrane water-cooled wall structure, which is in direct contact with the steel slag. It can serve as a heating surface to absorb the sensible heat of the steel slag and can also serve as a furnace wall to meet the strength and sealing requirements.

[0032] Example 2:

[0033] like Figure 2 As shown, the difference between this embodiment and the embodiment is that:

[0034] In this embodiment, the high-temperature material conveying assembly 1 includes a chain bucket conveyor 104; one end of the chain bucket conveyor 104 is arranged below the slag crusher 6, and the other end of the chain bucket conveyor 104 is arranged above the buffer silo 2; the chain bucket conveyor 104 can transport steel slag to the buffer silo 2 through the chain bucket thereon.

[0035] The use process and principle of this utility model are as follows:

[0036] The high-temperature steel slag is poured into the slag crusher 6 from the material tank. The high-temperature steel slag particles after being crushed by the slag crusher 6 are sent to the buffer silo 2 through the high-temperature material conveying component 1, and then sent to the heat exchange recovery furnace 3 from the buffer silo 2. The heat exchange recovery furnace 3 uses solid-solid heat exchange instead of traditional gas-solid heat exchange. The high-temperature solid particles (steel slag) are in direct contact with the heat exchange surface tube 4 for heat exchange, and there is only one heat exchange, which can significantly improve the waste heat recovery efficiency. When the steel slag moves to the bottom of the heat exchange recovery furnace 3, it falls from the hopper 5 to the transport vehicle 8 below, and is then transported away by the transport vehicle 8.

[0037] The high-temperature steel slag particle waste heat direct recovery device provided by the utility model has the following advantages:

[0038] (1) No fan is required, and the high-temperature slag falls by gravity. The equipment consumes low power, the operating cost of the entire process is reduced, and the economy is good;

[0039] (2) The air leakage rate is almost zero, there is no particulate matter emission, and the working environment of on-site personnel can be significantly improved;

[0040] (3) The device occupies a small area and has controllable costs, and can be fully applied to the waste heat recovery system of the production process of dry crushing high-temperature steel slag particles.

[0041] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A device for directly recovering waste heat from high-temperature steel slag particles, characterized by: High-temperature material conveying assembly (1), buffer silo (2), heat exchange recovery furnace (3); The buffer silo (2) is arranged above the heat exchange recovery furnace (3); the high-temperature material conveying assembly (1) is used to transport the steel slag into the buffer silo (2); the buffer silo (2) is used to put the steel slag into the heat exchange recovery furnace (3); heat exchange surface pipes (4) are arranged in the heat exchange recovery furnace (3); the heat exchange surface pipes are arranged obliquely, horizontally or vertically to form a steel slag flow channel; a hopper (5) is provided at the bottom of the heat exchange recovery furnace (3); the hopper (5) is used to discharge the steel slag in the heat exchange recovery furnace (3).

2. The device for directly recovering waste heat from high-temperature steel slag particles according to claim 1, characterized in that: The high-temperature material conveying assembly (1) includes an inclined bridge (101), a charging trolley (102) and a pulley mechanism (103); one end of the inclined bridge (101) is arranged below the slag breaker (6), and the other end of the inclined bridge (101) is arranged above the buffer silo (2); the charging trolley (102) is used to load steel slag, and the charging trolley (102) can move from one end of the inclined bridge (101) to the other end of the inclined bridge (101) under the traction of the pulley mechanism (103).

3. The device for directly recovering waste heat from high-temperature steel slag particles according to claim 1, characterized in that: The high-temperature material conveying assembly (1) comprises a chain bucket conveyor (104); one end of the chain bucket conveyor (104) is arranged below a slag breaker (6), and the other end of the chain bucket conveyor (104) is arranged above a buffer silo (2); the chain bucket conveyor (104) can transport steel slag into the buffer silo (2) through the chain bucket thereon.

4. The device for directly recovering waste heat from high-temperature steel slag particles according to claim 1, characterized in that: A conveyor belt (7) is provided at the bottom of the hopper (5); a plurality of transport vehicles (8) are arranged on the conveyor belt (7); the transport vehicles (8) move along the conveyor belt (7), collect the steel slag discharged from the bottom of the hopper (5), and transport the steel slag to the location of the next process.

5. The device for directly recovering waste heat from high-temperature steel slag particles according to claim 1, characterized in that: One end of the heat exchange surface tube (4) is a water inlet, and the other end is a steam outlet; the water inlet is located at the lower part of the heat exchange recovery furnace (3); and the steam outlet is located at the upper part of the heat exchange recovery furnace (3).

6. The device for directly recovering waste heat from high-temperature steel slag particles according to claim 1, characterized in that: The inner wall of the heat exchange recovery furnace (3) is provided with a heat insulation structure and a refractory structure; the refractory structure is arranged at the innermost side of the heat exchange recovery furnace (3) and is in contact with the steel slag; the heat insulation structure is arranged between the refractory structure and the inner wall of the heat exchange recovery furnace (3).

7. The device for directly recovering waste heat from high-temperature steel slag particles according to claim 1, characterized in that: The furnace wall of the heat exchange recovery furnace (3) adopts a membrane water-cooled wall structure and is in direct contact with the steel slag.

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