A high-pressure jet granulation device for molten slag of a slag gasifier

Abstract

The application provides a high-pressure jet granulation device for slag of a slag gasifier, and belongs to the field of slag granulation.The device comprises a gasifier, a granulation chamber and a jet assembly.The metallurgical slag is input into the gasifier from a feeding port, the gasifier converts the metallurgical slag into coal gas and slag, and the gasifier is provided with a jet pipe which is inserted into the metallurgical slag.The top of the granulation chamber is connected with a slag discharge port, the molten slag falls into the granulation chamber, the bottom of the granulation chamber is provided with a slag discharge port, and the side of the granulation chamber is connected with a gas discharge pipe.The jet assembly sprays high-pressure jets to the molten slag flow, so that the molten slag is converted into granulated slag and high-temperature gas, the granulated slag is discharged from the slag discharge port, and the high-temperature gas is discharged from the gas discharge pipe.The jet assembly sprays high-pressure jets to the molten slag flow, so that the molten slag flow is fully granulated under the impact of the high-pressure jets, the granulated slag is small and uniform in size, the high-pressure jets are rapidly converted into high-temperature gas after being contacted with the high-temperature molten slag flow, and the high-temperature gas is discharged from the gas discharge pipe and can be used through backflow.

Description

Technical Field

[0001] This invention relates to the field of slag granulation technology, and more particularly to a high-pressure jet granulation device for molten slag gasification slag. Background Technology

[0002] BGL (British Gas-Lurgi) molten slag gasification technology is a highly efficient pressurized gasification process for pulverized coal. It can gasify pulverized coal into converter gas for utilization, with a gasification temperature of 1300~1500℃. The ash residue remaining after the gasification reaction is discharged in a molten state. Current BGL processes mainly use water quenching to treat the molten slag, that is, rapidly cooling the liquid slag with a water cooling device to form a glassy solid.

[0003] However, the existing process has the following drawbacks: First, the traditional water quenching method is prone to producing slag wool or slag particles with uneven and large particle sizes, which means that the slag particles need to be ground before they can be reused in subsequent processes such as building materials; Second, the traditional water quenching method produces a large amount of wastewater, and the high-temperature waste heat of the molten slag (usually above 1300℃) is converted into low-temperature hydrothermal heat, making it difficult to effectively recover the waste heat for reuse. Summary of the Invention

[0004] In view of this, the present invention proposes a high-pressure jet granulation device for slag gasification furnace slag, which is used to solve the problems of large and uneven particle size of slag produced by traditional water quenching method, and the difficulty in recycling slag after preheating.

[0005] The technical solution of this invention is implemented as follows: This invention provides a high-pressure jet granulation device for molten slag gasification furnace slag, including a gasifier with a feed inlet at the top and a slag discharge outlet at the bottom; a granulation chamber located at the bottom of the gasifier; and a jet assembly located at the top of the granulation chamber. Metallurgical slag is fed into the gasifier through the feed inlet, and the gasifier converts the metallurgical slag into coal gas and molten slag. The molten slag is discharged through the slag discharge outlet. The top of the granulation chamber is connected to the slag discharge outlet, and the molten slag falls into the granulation chamber in the form of a molten slag flow. A slag discharge outlet is located at the bottom of the granulation chamber, and a gas outlet pipe is connected to the side of the granulation chamber, which is connected to a jet pipe. The jet assembly sprays a high-pressure jet onto the molten slag flow, converting the molten slag into granulated slag and generating high-temperature gas. The granulated slag is discharged from the slag discharge outlet, and the high-temperature gas is discharged from the gas outlet pipe.

[0006] Based on the above technical solutions, the preferred jet medium for high-pressure jets is water, air, or atomized water.

[0007] A further preferred embodiment includes a storage silo, located at the top of the gasifier and connected to the feed inlet; a heat exchange device, located inside the storage silo; wherein the storage silo stores metallurgical slag; a jet assembly sprays high-pressure atomized water jets onto the molten slag flow and generates high-temperature steam; and an exhaust pipe connects the granulation chamber and the heat exchange device, the exhaust pipe conveying the high-temperature steam to the heat exchange device.

[0008] More preferably, when the high-pressure jet is a high-pressure air flow, the jet pressure of the high-pressure jet is not less than 5 MPa; when the high-pressure jet is a high-pressure water jet or a high-pressure atomized water jet, the jet pressure of the high-pressure jet is not less than 20 MPa.

[0009] Based on the above technical solutions, preferably, the flow rate of the molten slag is 80 kg / min to 100 kg / min; and the flow rate of the high-pressure jet is 100 L / min to 500 L / min.

[0010] Based on the above technical solutions, preferably, the jet assembly includes a high-pressure conveying device installed outside the granulation chamber; a high-pressure spray disc installed at the top inside the granulation chamber; and several high-pressure nozzles arranged around the high-pressure spray disc. The high-pressure conveying device is connected to the high-pressure spray disc and pressurizes and conveys the jet medium to the high-pressure spray disc. The molten slag flow passes through the center of the high-pressure spray disc. The several high-pressure nozzles surround the molten slag flow and simultaneously spray high-pressure jets into the molten slag flow.

[0011] More preferably, the spray centerline of the high-pressure nozzle is inclined relative to the centerline of the molten slag flow's falling direction, and the angle between the spray centerline of the high-pressure nozzle and the centerline of the molten slag flow's falling direction is 30~60°.

[0012] On the other hand, the present invention also provides a high-pressure jet granulation method for slag from a slag gasification furnace, using the aforementioned high-pressure jet granulation device for slag from a slag gasification furnace, comprising the following steps: Step 1, metallurgical slag is fed into the gasifier, and the gas produced by the gasifier is discharged into the granulation chamber as slag flow; Step 2, the jet assembly sprays a high-pressure atomized water jet onto the slag flow, granulating the slag flow and generating high-temperature steam, which is discharged from the outlet pipe; Step 3, the pressure and flow rate of the high-pressure atomized water jet sprayed by the jet assembly are controlled to ensure that the particle size of the granulated slag produced by the slag flow meets the standard.

[0013] Based on the above technical solutions, preferably, in step two, high-temperature steam is transported to a heat exchange device through an outlet pipe, and the heat exchange device preheats the metallurgical slag in the storage silo.

[0014] Based on the above technical solutions, the preferred option is that the particle size of the granulated slag is no greater than 0.5 mm.

[0015] The high-pressure jet granulation device for molten slag gasification furnace slag of the present invention has the following advantages over the prior art: (1) The present invention sprays high-pressure jets into the molten slag flow through the jet assembly, which not only makes the molten slag flow fully granulated under the impact of the high-pressure jet, obtaining fine and uniform granulated slag, avoiding subsequent crushing costs, but also the high-pressure jet can be quickly converted into high-temperature gas after contacting the high-temperature molten slag flow and discharged from the gas outlet pipe, and can be recycled through the gas outlet pipe, thereby recovering and reusing the waste heat of the molten slag flow, greatly reducing water consumption and wastewater discharge.

[0016] (2) The present invention uses atomized water as the jet medium of high pressure jet. Compared with water jet or air jet, it can significantly reduce water consumption and increase the temperature of the obtained high temperature steam. The high temperature steam is then reused for the preheating of raw materials in the gasifier, reducing the consumption of fresh steam in the BGL process. This helps to increase the internal temperature of the gasifier, improve the efficiency of cold gas to over 93%, and increase the carbon conversion rate to over 99.7%. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the high-pressure jet granulation device of the present invention.

[0019] In the diagram: 1. Gasifier; 11. Feed inlet; 12. Slag outlet; 13. Gas outlet; 2. Granulation chamber; 21. Slag outlet; 22. Gas outlet pipe; 23. Jet pipe; 24. Dust removal device; 3. Jet assembly; 31. High-pressure conveying device; 32. High-pressure spray disc; 33. High-pressure nozzle; 4. Storage silo; 5. Heat exchange device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention 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 invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and 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 the embodiments of the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0026] like Figure 1 As shown, a high-pressure jet granulation device for slag gasification furnace slag of the present invention includes a gasification furnace 1, a granulation chamber 2 and a jet assembly 3.

[0027] The gasifier 1 has a feed inlet 11 at the top and a slag discharge outlet 12 at the bottom. Metallurgical slag is fed into the gasifier 1 through the feed inlet 11, and the gasifier 1 converts the metallurgical slag into gas and molten slag. The molten slag is discharged through the slag discharge outlet 12. A jet pipe 23 is inserted into the metallurgical slag on the outer peripheral wall of the gasifier 1. The gasifier 1 is a device that converts metallurgical slag into converter gas through a gasification reaction. A gasifying agent / steam / oxygen is injected into the metallurgical slag through the jet pipe 23, and reacts with the carbon components to generate CO and H2, thereby converting some of the carbon components in the metallurgical slag into usable converter gas. A gas outlet 13 is opened on the upper peripheral wall of the gasifier 1, and the converter gas is discharged from the gas outlet 13 for collection and utilization. The remaining part of the metallurgical slag forms a high-temperature molten waste slag with a temperature ≥1300℃. It enters the granulation chamber 2 through the slag discharge outlet 12 and falls freely to form a molten slag flow.

[0028] Granulation chamber 2 is located at the bottom of gasifier 1. The function of granulation chamber 2 is to granulate slag. The top of granulation chamber 2 is connected to slag discharge port 12. Slag falls into granulation chamber 2 in the form of slag flow. Slag discharge port 21 is provided at the bottom of granulation chamber 2. Gas outlet pipe 22 is connected to the side of granulation chamber 2. Gas outlet pipe 22 is connected to jet pipe 23.

[0029] The jet assembly 3 is located at the top of the granulation chamber 2. The jet assembly 3 sprays a high-pressure jet into the molten slag flow, which impacts the molten slag, breaking it into fine particles and transforming it into granulated slag. The granulated slag is discharged from the slag outlet 21, allowing for the collection and recycling of slag powder. After granulation, the slag powder becomes vitrified, with a glass content ≥95%, and can be directly used as cement admixture or lightweight aggregate. Simultaneously, during the granulation process, the residual heat of the molten slag causes the jet medium to vaporize instantaneously, generating high-temperature gas. This high-temperature gas is discharged from the gas outlet pipe 22. Since the tail end of the gas outlet pipe 22 is connected to the jet nozzle 23, the high-temperature gas can be returned to the gasifier 1 as a gasifying agent to participate in the gasification reaction. A dust removal device 24 can also be installed in the middle of the gas outlet pipe 22 to filter and remove dust from the high-temperature gas before it is reused. This process not only granulates the molten slag for recycling, but also utilizes the high-temperature gas generated during granulation to recycle the waste heat of the molten slag. Furthermore, the high-pressure jet injection process significantly reduces water consumption and subsequent wastewater generation compared to the traditional water quenching method. The generated dust is collected and treated in a closed system throughout the process. Therefore, the entire process system is highly compatible and suitable for atmospheric or pressurized BGL molten slag gasification furnaces, making it very environmentally friendly.

[0030] exist Figure 1In one embodiment shown, the jet medium of the high-pressure jet is water, air, or atomized water, which can essentially be considered a gas-water mixture. Although theoretically, water, air, or atomized water can all be used as the jet medium in this process, practical experiments have shown that atomized water is the most effective jet medium for this process, achieving good slag granulation and enhancing the gasification reaction. To verify the influence of different jet media on the quality of the obtained high-temperature steam, this embodiment sets up a comparative experiment. Water, air, or atomized water are used as the jet media in three test groups Y1-3, and the traditional water quenching method is used as the blank group K1. Specifically, the slag flow rate is set to 80 kg / min, the high-pressure jet pressure is 20 MPa, and the high-pressure jet flow rate is 100 L / min. In addition, since the atomized water medium is essentially a gas-water mixture, the water-to-air ratio of the atomized water will affect the total water content in the high-pressure jet. Therefore, test groups Y4-5 are also set up. In test groups Y4-5, the water-to-air ratio of the atomized water is controlled at 3.0 and 5.0, respectively, and the corresponding high-pressure jet flow rates are 300 L / min and 500 L / min. After the experiment, the median particle size (mm) of the granulated slag, the high-temperature steam temperature (°C), the waste heat recovery rate (%), and the carbon conversion rate (%) are used as comparison parameters. The experimental results are shown in Table 1 below.

[0031] Table 1 A comparison of the results from experimental examples Y1-3 and blank example K1 reveals that using atomized water as the high-pressure jet medium significantly and substantially increases the obtained steam temperature, resulting in finer and more uniform granulated slag. Furthermore, the increased temperature of the recycled steam effectively enhances the carbon conversion rate of the gasification reaction in gasifier 1, leading to a greater converter gas production. The high-pressure jet granulation process described in this case clearly demonstrates a more significant improvement in converter gas yield compared to the traditional water quenching method.

[0032] Comparing the results of test examples Y3 to Y5, it can be found that when the total water content of the high-pressure atomized water jet remains unchanged, the higher the water-to-air ratio, the greater the flow rate of the high-pressure jet, which in turn makes the granulation reaction more complete, thereby increasing the steam temperature and the carbon conversion rate of the gasification reaction.

[0033] exist Figure 1 In one embodiment shown, the device also includes a storage silo 4 and a heat exchange device 5.

[0034] The storage silo 4 is located at the top of the gasifier 1 and is connected to the feed inlet 11. The front end of the storage silo 4 can be connected to a metallurgical system, so that the metallurgical slag can be processed and temporarily stored in the storage silo 4. The jet assembly 3 sprays high-pressure atomized water jets into the molten slag flow and generates high-temperature steam.

[0035] The heat exchange device 5 is installed inside the storage silo 4. The heat exchange device 5 can consist of several heat exchange tubes meandering within the storage silo 4. The metallurgical slag in the storage silo can either bury the heat exchange device 5 for heat exchange or sequentially exchange heat with multiple heat exchange tubes as it falls into the storage silo 4. A three-way valve can be installed in the middle of the exhaust pipe 22, connecting one end of the exhaust pipe 22 to the heat exchange device 5, thereby allowing the exhaust pipe 22 to deliver high-temperature steam to the heat exchange device 5. The heat exchange device 5 preheats the metallurgical slag raw material in the storage silo 4, thereby improving the gasification reaction effect in the gasifier 1.

[0036] exist Figure 1 In one embodiment shown, when the high-pressure jet is a high-pressure air stream, the jet pressure is not less than 5 MPa; when the high-pressure jet is a high-pressure water jet or a high-pressure atomized water jet, the jet pressure is not less than 20 MPa. This is because when the high-pressure conveying device 31 conveys water or atomized water as the jet medium, it requires a greater conveying pressure compared to air. Theoretically, the higher the jet pressure, the better the granulation reaction between the high-pressure jet and the molten slag stream can be. However, due to equipment pressure limitations, a pressure range of 30~100 MPa is generally preferred.

[0037] exist Figure 1 In one embodiment shown, the flow rate of the molten slag stream is 80 kg / min to 100 kg / min; the flow rate of the high-pressure jet is 100 L / min to 500 L / min. Experiments show that as the flow rate of the molten slag stream increases, the flow rate of the high-pressure jet also needs to be increased accordingly; however, when the flow rate of the molten slag stream remains constant, increasing the flow rate of the high-pressure jet can effectively improve the granulation reaction.

[0038] exist Figure 1 In one embodiment shown, the jet assembly 3 includes a high-pressure delivery device 31, a high-pressure spray disc 32, and a high-pressure nozzle 33.

[0039] The high-pressure conveying device 31 is located outside the granulation chamber 2; the high-pressure conveying device 31 is connected to the high-pressure spray plate 32 and pressurizes and conveys the jet medium to the high-pressure spray plate 32. The high-pressure conveying device 31 can be a high-pressure conveying pump, which pressurizes and pumps external water to the high-pressure spray plate 32.

[0040] The high-pressure spray disc 32 is located at the top inside the granulation chamber 2; the molten slag flows through the center of the high-pressure spray disc 32. The high-pressure spray disc 32 converts water into atomized water and delivers it to the nozzle 33 for spraying.

[0041] Several high-pressure nozzles 33 are arranged around the high-pressure spray plate 32; the several high-pressure nozzles 33 surround the molten slag flow and simultaneously spray high-pressure jets into the molten slag flow, ensuring that several high-pressure atomized water jets can fully contact the molten slag flow to carry out granulation reaction.

[0042] exist Figure 1 In one embodiment shown, the injection centerline of the high-pressure nozzle 33 is inclined relative to the centerline of the molten slag flow's falling direction, and the angle between the injection centerline of the high-pressure nozzle 33 and the centerline of the molten slag flow's falling direction is 30~60°. To investigate the impact of the high-pressure jet injection angle variation on the quality of the obtained high-temperature steam and the quality of converter gas generation, a comparative experiment was conducted in this embodiment. Atomized water was used as the jet medium in three test cases X1~3. Specifically, the molten slag flow rate was 80 kg / min, the high-pressure jet pressure was 20 MPa, and the high-pressure jet flow rate was 100 L / min. The difference between test cases X1~3 was that the jet angle of the high-pressure nozzle 33 was 30°, 45°, and 60°, respectively. After the experiment, the median particle size (mm), high-temperature steam temperature (°C), and carbon conversion rate (%) of the granulated slag were used as comparison parameters, and the experimental results are shown in Table 2 below.

[0043] Table 2 The comparative experiments above reveal that different jet angles result in varying slag granulation and waste heat recovery effects. This is because increasing the jet angle (let's call it α) increases the momentum (P) of the jet in the shear direction of the slag flow. 剪切 =P 总 sinα) increases, while the momentum (P) in the tensile direction of the slag flow increases. 拉伸 =P 总 cosα) decreases. P 剪切 and P 拉伸 The values ​​together determine the slag crushing effect. Experiments have shown that a jet angle of 45° can achieve the optimal granulation and waste heat recovery effect.

[0044] like Figure 1 As shown, the present invention provides a high-pressure jet granulation method for slag from a slag gasification furnace, employing a high-pressure jet granulation device for slag from a slag gasification furnace according to any of the above embodiments. The method includes the following steps: Step 1, metallurgical slag is input into a gasifier 1, and the gas produced by the gasifier 1 is discharged into the granulation chamber 2 as slag flow; Step 2, a jet assembly 3 sprays a high-pressure atomized water jet onto the slag flow, granulating the slag flow and generating high-temperature steam, which is then discharged from the outlet pipe 22; Step 3, the pressure and flow rate of the high-pressure atomized water jet sprayed by the jet assembly 3 are controlled to ensure that the particle size of the granulated slag produced by the slag flow meets the specified standards.

[0045] exist Figure 1In one embodiment shown, in step two, high-temperature steam is transported to heat exchange device 5 through gas outlet pipe 22, and the metallurgical slag in storage bin 4 is preheated by heat exchange device 5; the preheating of raw materials can increase the internal temperature of gasifier 1, thereby increasing the efficiency of cold gas to 93% and the carbon conversion rate to 99.7%.

[0046] exist Figure 1 In one embodiment shown, the granulated slag has a standard particle size of no more than 0.5 mm. More specifically, the granulated slag obtained by this process typically has a particle size of less than 200 micrometers and a glass content of ≥95%.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-pressure jet granulation device for molten slag gasification slag, characterized in that, include: Gasifier (1) has a feed inlet (11) at the top and a slag discharge outlet (12) at the bottom. Granulation chamber (2) is located at the bottom of the gasifier (1); The jet assembly (3) is disposed at the top of the granulation chamber (2); Metallurgical slag is fed into the gasifier (1) through the feed inlet (11), the gasifier (1) converts the metallurgical slag into coal gas and molten slag, the slag discharge port (12) discharges the molten slag, and a jet pipe (23) is inserted into the outer peripheral wall of the gasifier (1). The jet pipe (23) is inserted into the metallurgical slag. The top of the granulation chamber (2) is connected to the slag discharge port (12), and the molten slag falls into the granulation chamber (2) in the form of molten slag flow. The bottom of the granulation chamber (2) is provided with a slag outlet (21), and the side of the granulation chamber (2) is connected to an air outlet pipe (22), which is connected to an air jet pipe (23). The jet assembly (3) sprays a high-pressure jet into the molten slag flow, causing the molten slag to be converted into granulated slag and generating high-temperature gas. The granulated slag is discharged from the slag outlet (21), and the high-temperature gas is discharged from the gas outlet pipe (22).

2. The high-pressure jet granulation device for molten slag gasification furnace slag according to claim 1, characterized in that: The jet medium of the high-pressure jet is water, air, or atomized water.

3. The high-pressure jet granulation device for molten slag gasification furnace slag according to claim 2, characterized in that, Also includes: A storage bin (4) is located on top of the gasifier (1) and connected to the feed inlet (11); A heat exchange device (5) is installed inside the storage silo (4); The storage bin (4) contains metallurgical slag; The jet assembly (3) sprays high-pressure atomized water jets into the molten slag flow and generates high-temperature steam; The outlet pipe (22) connects the granulation chamber (2) and the heat exchange device (5), and the outlet pipe (22) delivers high-temperature steam to the heat exchange device (5).

4. The high-pressure jet granulation device for molten slag gasification furnace slag according to claim 2, characterized in that: When the high-pressure jet is a high-pressure air stream, the jet pressure of the high-pressure jet is not less than 5 MPa; when the high-pressure jet is a high-pressure water jet or a high-pressure atomized water jet, the jet pressure of the high-pressure jet is not less than 20 MPa.

5. The high-pressure jet granulation device for molten slag gasification furnace slag according to claim 1, characterized in that: The flow rate of the molten slag is 80 kg / min to 100 kg / min; the flow rate of the high-pressure jet is 100 L / min to 500 L / min.

6. The high-pressure jet granulation device for molten slag gasification furnace slag according to claim 1, characterized in that: The jet assembly (3) includes, A high-pressure conveying device (31) is installed outside the granulation chamber (2); A high-pressure spray disc (32) is disposed at the top inside the granulation chamber (2); Several high-pressure nozzles (33) are arranged around the high-pressure spray plate (32); The high-pressure conveying device (31) is connected to the high-pressure spray disc (32) and pressurizes and conveys the jet medium to the high-pressure spray disc (32); The molten slag flow passes through the center of the high-pressure spray plate (32); Several of the high-pressure nozzles (33) surround the molten slag flow and simultaneously spray high-pressure jets into the molten slag flow.

7. The high-pressure jet granulation device for molten slag gasification furnace slag according to claim 6, characterized in that: The spray center line of the high-pressure nozzle (33) is inclined relative to the center line of the falling direction of the molten slag flow, and the angle between the spray center line of the high-pressure nozzle (33) and the center line of the falling direction of the molten slag flow is 30~60°.

8. A high-pressure jet granulation method for molten slag gasification furnace slag, characterized in that: The high-pressure jet granulation device for molten slag gasification as described in claim 3 includes the following steps: Step 1: Metallurgical slag is fed into the gasifier (1), and the gasifier (1) produces coal gas and discharges molten slag into the granulation chamber (2); Step 2: The jet assembly (3) sprays high-pressure atomized water jets into the molten slag flow, causing the molten slag flow to granulate and generate high-temperature steam, which is discharged from the outlet pipe (22). Step 3: Control the pressure and flow rate of the high-pressure atomized water jet ejected by the jet assembly (3) so that the particle size of the granulated slag generated by the molten slag flow meets the standard.

9. The high-pressure jet granulation method for slag in slag gasification furnaces according to claim 8, characterized in that: In step two, the high-temperature steam is transported to the heat exchange device (5) through the steam outlet pipe (22) and the metallurgical slag in the storage bin (4) is preheated by the heat exchange device (5).

10. The high-pressure jet granulation method for molten slag gasification furnace slag according to claim 8, characterized in that: The granulated slag shall have a particle size of no more than 0.5 mm.

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