Liquid slag waste heat recovery device

Abstract

The utility model discloses a liquid slag waste heat recovery device, which belongs to the field of waste heat utilization of metallurgy, steel and electric power liquid slag discharge furnaces, and comprises a heat insulation cylinder, a heat exchange tube and a heat exchange tube, the bottom of the heat insulation cylinder is connected with a slag flowing groove; the slag cooler is arranged below the heat insulation cylinder, and a slag inlet is formed in the slag cooler; the slag inlet and the slag flowing groove are correspondingly arranged, so that liquid slag in the heat insulation cylinder flows into the slag cooler; a crushing unit is arranged in the slag cooler; the crushing unit is arranged corresponding to the slag inlet so as to crush the liquid slag; the cooling unit is connected with the slag cooler so as to cool and exchange heat for the liquid slag crushed by the crushing unit; and the drainage unit is connected with the hot air outlet of the slag cooler so as to drain heat in the slag cooler into the boiler. The liquid slag waste heat recovery device provided by the utility model is low in operation cost, and can reduce the energy consumption of a boiler on the premise of meeting environmental protection, and the liquid slag waste heat recovery rate can reach more than 80%.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat utilization in metallurgical, steel and power liquid slag discharge furnaces, and specifically relates to a liquid slag waste heat recovery device. Background Technology

[0002] With increasingly stringent environmental protection requirements, the treatment of solid and hazardous waste increasingly favors liquid slag disposal for harmless treatment. Currently, liquid slag is mainly produced by water cooling to form water-quenched slag. After solid-liquid separation using a slag remover, the slag is cooled naturally or by forced cooling and then recycled. This heat accounts for approximately 3% to 6% of the fuel energy consumed, meaning the heat carried by the liquid slag is not effectively utilized. As energy consumption requirements become increasingly stringent, this heat loss becomes particularly significant. Furthermore, due to equipment layout and relatively small slag volume, the liquid slag produced in incinerators is not suitable for waste heat recovery using grate coolers. Utility Model Content

[0003] To solve the above problems, the present invention adopts the following technical solution:

[0004] A liquid slag waste heat recovery device, comprising:

[0005] An insulated cylinder is used to hold liquid slag; a slag flow channel is connected to the bottom of the insulated cylinder.

[0006] A slag cooler is installed below the insulation cylinder, and the slag cooler is provided with a slag inlet; the slag inlet is correspondingly arranged with the slag flow channel so that the liquid slag in the insulation cylinder flows into the slag cooler; a crushing unit is provided inside the slag cooler; the crushing unit is correspondingly arranged with the slag inlet so as to crush the liquid slag.

[0007] A cooling unit is connected to the slag cooler to cool and exchange heat with the liquid slag after crushing by the crushing unit.

[0008] A heat diversion unit is connected to the hot air outlet of the slag cooler to divert heat from the slag cooler into the boiler.

[0009] Furthermore, the slag flow channel is inclined downwards so that the liquid slag in the insulation cylinder flows into the slag cooler.

[0010] Furthermore, the slag cooler includes:

[0011] Outer cylinder; the hot air outlet is located at the top of the outer cylinder and is connected to the air intake unit;

[0012] An inner cylinder is disposed inside the outer cylinder, and the inner cylinder and the outer cylinder are coaxially arranged with the same bottom; a gap is left between the inner cylinder and the outer cylinder to form a third cooling zone; the opening at the top of the inner cylinder communicates with the inner cavity of the outer cylinder.

[0013] Two opposing rollers are disposed inside the slag cooler and connected to the outer cylinder to crush the liquid slag.

[0014] Two drive units are connected to the outer cylinder; the drive ends of the two drive units extend into the outer cylinder and are respectively connected to the two rollers to drive the two rollers to rotate in opposite directions.

[0015] Furthermore, the relative distance between the two rollers is adjustable.

[0016] Furthermore, the cooling unit includes:

[0017] Blower;

[0018] A first-stage cooling duct is provided, with its first end connected to the blower; its second end extends into the outer cylinder and is correspondingly positioned to the drum; a scraper and multiple drum cooling air outlets are provided at the top of the second end of the first-stage cooling duct; the scraper is fixedly connected to the outer wall of the first-stage cooling duct to scrape off the slag film adhering to the drum; and a slag film cooling air outlet is provided on the side wall of the second end of the first-stage cooling duct to cool the slag film.

[0019] Multiple second air outlets are arranged circumferentially along the central axis at the bottom of the side wall of the inner cylinder; multiple second air outlets are arranged axially along the central axis.

[0020] A second-stage cooling duct, the first end of which is connected to the blower, and the second end which passes through the side wall of the outer cylinder and is connected to the second air outlet, so that the second-stage cooling air enters the inner cylinder to cool the slag film while performing secondary crushing.

[0021] Multiple third air outlets are arranged circumferentially along the central axis at the bottom of the side wall of the outer cylinder;

[0022] A Class III cooling duct, wherein the first end of the Class III cooling duct is connected to the blower, the second end is connected to the third air outlet, and is connected to the third cooling zone.

[0023] Furthermore, the bottoms of both the outer cylinder and the inner cylinder gradually taper in a funnel shape.

[0024] Furthermore, the inner cylinder is a ceramic inner cylinder; the air permeability of the ceramic inner cylinder is greater than 50%.

[0025] Furthermore, the bottom of the outer cylinder is provided with a slag outlet, which is connected to the interior of the inner cylinder; an electric baffle is horizontally arranged on the slag outlet.

[0026] Furthermore, the diversion unit includes a diversion pipe and an induced draft fan installed on the diversion pipe. The diversion pipe is connected to the hot air outlet to divert heat from the hot air outlet into the boiler.

[0027] Furthermore, it also includes a cyclone separator disposed between the hot air outlet and the induced draft fan.

[0028] Beneficial effects:

[0029] This utility model provides a liquid slag waste heat recovery device, which can recover the waste heat of liquid slag. The liquid slag waste heat recovery rate can reach more than 80%, which is more reliable. The device has low operating cost and can reduce boiler energy consumption while meeting environmental protection requirements. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the internal structure of the liquid slag waste heat recovery device of this utility model. Figure 1 ;

[0031] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0032] Figure 3 This is a schematic diagram of the internal structure of the liquid slag waste heat recovery device of this utility model. Figure 2 ;

[0033] The components include: 1. Insulation cylinder; 2. Slag trough; 3. Slag cooler; 3.1. Outer cylinder; 3.2. Ceramic inner cylinder; 3.3. Stage I cooling duct; 3.4. Drum; 3.5. Slag inlet; 3.6. Hot air outlet; 3.7. Electric baffle; 3.8. Slag outlet; 3.9. Stage II cooling duct; 3.10. Stage III cooling duct; 3.3.1. Slag film cooling air outlet; 3.3.2. Drum cooling air outlet; 3.3.3. Scraper; 4. Cyclone separator; 5. Exhaust fan; 6. Blower; 7. Drive unit; 8. Liquid slag. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] Example 1

[0039] like Figures 1 to 3 As shown, a waste heat recovery device for liquid slag includes:

[0040] Insulation cylinder 1 is used to hold liquid slag 8; the bottom of the insulation cylinder 1 is connected to a slag flow channel 2.

[0041] A slag cooler 3 is installed below the insulation cylinder 1. The slag cooler 3 is provided with a slag inlet 3.5. The slag inlet 3.5 is provided in correspondence with the slag flow channel 2 so that the liquid slag 8 in the insulation cylinder 1 flows into the slag cooler 3. A crushing unit is provided inside the slag cooler 3. The crushing unit is provided in correspondence with the slag inlet 3.5 so as to crush the liquid slag 8.

[0042] The cooling unit is connected to the slag cooler 3 to cool and exchange heat with the liquid slag 8 after it has been crushed by the crushing unit.

[0043] The heat diversion unit is connected to the hot air outlet of the slag cooler 3 to divert the heat in the slag cooler 3 into the boiler.

[0044] In this embodiment, the slag flow channel 2 is inclined downward so that the liquid slag 8 in the insulation cylinder 1 flows into the slag cooler 3.

[0045] With the above technical solution, preferably, the slag trough 2 of the insulation cylinder 1 is located on the side, which facilitates unblocking when blockage occurs.

[0046] In this embodiment, the slag cooler 3 includes:

[0047] Outer cylinder 3.1; The hot air outlet is located at the top of the outer cylinder 3.1 and is connected to the air intake unit;

[0048] The inner cylinder is set inside the outer cylinder 3.1, and the inner cylinder and the outer cylinder 3.1 are coaxial and share the same bottom; a gap is left between the inner cylinder and the outer cylinder 3.1 to form a third cooling zone; the opening at the top of the inner cylinder is connected to the inner cavity of the outer cylinder 3.1.

[0049] Two opposing rollers 3.4 are arranged inside the slag cooler 3 and connected to the outer cylinder 3.1 to crush the liquid slag 8.

[0050] Two drive units 7 are connected to the outer cylinder 3.1; the drive ends of the two drive units 7 extend into the outer cylinder 3.1 and are respectively connected to two rollers 3.4 to drive the two rollers 3.4 to rotate in opposite directions.

[0051] In this embodiment, the relative distance between the two rollers 3.4 is adjustable.

[0052] Preferably, the drive unit 7 is a variable frequency motor, and the drum 3.4 is driven by a variable frequency motor. The speed can be adjusted according to the change in the amount of liquid slag 8, and the speed adjustment range is 100-200 r / min.

[0053] In this embodiment, the cooling unit includes:

[0054] Blower 6;

[0055] A first-stage cooling duct 3.3 is provided, with its first end connected to the blower 6; the second end of the first-stage cooling duct 3.3 extends into the outer cylinder 3.1 and is correspondingly positioned to the drum 3.4; a scraper 3.3.3 and multiple drum cooling air outlets 3.3.2 are provided at the top of the second end of the first-stage cooling duct 3.3; the scraper 3.3.3 is fixedly connected to the outer wall of the first-stage cooling duct 3.3 to scrape off the slag film adhering to the drum 3.4; a slag film cooling air outlet 3.3.1 is provided on the side wall of the second end of the first-stage cooling duct 3.3 to cool the slag film;

[0056] Multiple second air outlets are arranged circumferentially along the central axis at the bottom of the side wall of the inner cylinder; multiple second air outlets are arranged axially along the central axis.

[0057] The first end of the second-stage cooling air duct 3.9 is connected to the blower 6, and the second end passes through the side wall of the outer cylinder 3.1 and is connected to the second air outlet, so that the second-stage cooling air enters the inner cylinder to cool the slag film while performing secondary crushing.

[0058] Multiple third air outlets are arranged circumferentially along the central axis at the bottom of the side wall of the outer cylinder 3.1;

[0059] The first end of the Class III cooling duct 3.10 is connected to the blower 6; the second end is connected to the third air outlet and communicates with the third cooling zone.

[0060] Through the above technical solution, the outlet air velocity of the roller cooling air outlet 3.3.2 and the slag film cooling air outlet 3.3.1 on the first-stage cooling air duct 3.3 is greater than 50 m / s. The cooling air from the roller 3.4 at the roller cooling air outlet 3.3.2 cools the working roller 3.4 to prevent the roller 3.4 from overheating during continuous operation. The slag film cooling air from the slag film cooling air outlet 3.3.1 cools and breaks up the slag film. The outlet air velocity of the second-stage cooling air is greater than 50 m / s. While the high-speed airflow blown out by the first-stage cooling air duct 3.3 cools and breaks up the slag film, the high-speed airflow of the second-stage cooling air agitates and performs secondary impact crushing on the small, thin fragments after crushing. A scraper 3.3.3 is fixed on the first-stage cooling air duct 3.3. The scraper 3.3.3 contacts the extrusion surface of the roller 3.4 to prevent the slag film from sticking to the roller 3.4 and to allow the slag film to fall off in time.

[0061] In this embodiment, the bottoms of both the outer cylinder 3.1 and the inner cylinder gradually taper in a funnel shape.

[0062] In this embodiment, the inner cylinder is a ceramic inner cylinder 3.2; the air permeability of the ceramic inner cylinder 3.2 is greater than 50%.

[0063] To prevent wear on the inner wall of the slag cooler 3, a wear-resistant ceramic inner cylinder 3.2 is provided through the above technical solution. The air permeability of the ceramic inner cylinder 3.2 is required to be >50%. The air blown out by the Class III cooling air duct 3.10 enters the space between the wear-resistant ceramic inner cylinder 3.2 and the outer cylinder 3.1, and enters the interior of the slag cooler 3 through the tiny pores of the ceramic inner cylinder 3.2 to cool the inner cylinder and prevent the slag film from sticking to the roller 3.4.

[0064] In this embodiment, the bottom of the outer cylinder 3.1 is provided with a slag outlet 3.8, which is connected to the interior of the inner cylinder; an electric slide plate 3.7 is horizontally arranged on the slag outlet 3.8.

[0065] In this embodiment, the diversion unit includes a diversion pipe and an induced draft fan 5 installed on the diversion pipe. The diversion pipe is connected to the hot air outlet to divert the heat from the hot air outlet into the boiler.

[0066] In this embodiment, a cyclone separator 4 is also included, which is disposed between the hot air outlet 3.6 and the induced draft fan 5.

[0067] The liquid slag 8 process of the liquid slag waste heat recovery device provided in this embodiment is as follows:

[0068] The molten slag inside the insulating cylinder 1 enters the slag cooler 3 through the ceramic slag trough 2 and the slag inlet 3.5. After being squeezed by the roller 3.4, it forms a slag film with a thickness of about 0.5-2mm. The slag film is cooled by the slag film cooling air 3.3.1 from the first-stage cooling air duct and falls into the bottom of the slag cooler 3. It is further cooled by the second-stage cooling air to below 150℃ and discharged from the slag outlet 3.8.

[0069] The cooling air flow process of the liquid slag waste heat recovery device provided in this embodiment is as follows:

[0070] After passing through the blower 6, the cooling air is divided into three paths, corresponding to the first-stage cooling air duct 3.3, the second-stage cooling air duct 3.9, and the third-stage cooling air duct 3.10, respectively. The cooling air blown out by the first-stage cooling air duct 3.3 includes the slag film cooling air 3.3.1 and the drum cooling air 3.3.2. After heat exchange, the three cooling air paths are discharged from the hot air outlet 3.6, and after passing through the cyclone separator 4, they are connected to the induced draft fan 5.

[0071] The above are merely preferred embodiments of the present utility model and do not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A liquid slag waste heat recovery device, characterized in that, include: An insulated cylinder is used to hold liquid slag; a slag flow channel is connected to the bottom of the insulated cylinder. A slag cooler is installed below the insulation cylinder, and the slag cooler is provided with a slag inlet; the slag inlet is correspondingly arranged with the slag flow channel so that the liquid slag in the insulation cylinder flows into the slag cooler; a crushing unit is provided inside the slag cooler; the crushing unit is correspondingly arranged with the slag inlet so as to crush the liquid slag. A cooling unit is connected to the slag cooler to cool and exchange heat with the liquid slag after crushing by the crushing unit. A heat diversion unit is connected to the hot air outlet of the slag cooler to divert heat from the slag cooler into the boiler.

2. The liquid slag waste heat recovery device according to claim 1, characterized in that, The slag flow channel is inclined downwards so that the liquid slag in the insulation cylinder flows into the slag cooler.

3. The liquid slag waste heat recovery device according to claim 1, characterized in that, The slag cooler includes: Outer cylinder; the hot air outlet is located at the top of the outer cylinder and is connected to the air intake unit; An inner cylinder is disposed inside the outer cylinder, and the inner cylinder and the outer cylinder are coaxially arranged with the same bottom; a gap is left between the inner cylinder and the outer cylinder to form a third cooling zone; the opening at the top of the inner cylinder communicates with the inner cavity of the outer cylinder. Two opposing rollers are disposed inside the slag cooler and connected to the outer cylinder to crush the liquid slag. Two drive units are connected to the outer cylinder; the drive ends of the two drive units extend into the outer cylinder and are respectively connected to the two rollers to drive the two rollers to rotate in opposite directions.

4. The liquid slag waste heat recovery device according to claim 3, characterized in that, The relative distance between the two rollers is adjustable.

5. The liquid slag waste heat recovery device according to claim 3, characterized in that, The cooling unit includes: Blower; A first-stage cooling duct is provided, with its first end connected to the blower; its second end extends into the outer cylinder and is correspondingly positioned to the drum; a scraper and multiple drum cooling air outlets are provided at the top of the second end of the first-stage cooling duct; the scraper is fixedly connected to the outer wall of the first-stage cooling duct to scrape off the slag film adhering to the drum; and a slag film cooling air outlet is provided on the side wall of the second end of the first-stage cooling duct to cool the slag film. Multiple second air outlets are arranged circumferentially along the central axis at the bottom of the side wall of the inner cylinder; multiple second air outlets are arranged axially along the central axis. A second-stage cooling duct, the first end of which is connected to the blower, and the second end which passes through the side wall of the outer cylinder and is connected to the second air outlet, so that the second-stage cooling air enters the inner cylinder to cool the slag film while performing secondary crushing. Multiple third air outlets are arranged circumferentially along the central axis at the bottom of the side wall of the outer cylinder; A Class III cooling duct, wherein the first end of the Class III cooling duct is connected to the blower, the second end is connected to the third air outlet, and is connected to the third cooling zone.

6. The liquid slag waste heat recovery device according to claim 4, characterized in that, The bottoms of both the outer cylinder and the inner cylinder gradually taper in a funnel shape.

7. The liquid slag waste heat recovery device according to claim 4, characterized in that, The inner cylinder is a ceramic inner cylinder; the air permeability of the ceramic inner cylinder is greater than 50%.

8. The liquid slag waste heat recovery device according to claim 4, characterized in that, The bottom of the outer cylinder is provided with a slag outlet, which is connected to the interior of the inner cylinder; an electric baffle is horizontally arranged on the slag outlet.

9. The liquid slag waste heat recovery device according to claim 1, characterized in that, The diversion unit includes a diversion pipe and an induced draft fan installed on the diversion pipe. The diversion pipe is connected to the hot air outlet to divert heat from the hot air outlet into the boiler.

10. The liquid slag waste heat recovery device according to claim 9, characterized in that, It also includes a cyclone separator disposed between the hot air outlet and the induced draft fan.

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