Coal slurry grinding device

Abstract

The utility model discloses a coal slurry grinding device, relates to the technical field of coal slurry grinding, and solves the problems of low coal slurry concentration and insufficient gasification conversion efficiency of the existing device. The device comprises a primary grinding assembly, a secondary grinding assembly and a mixing assembly which are sequentially communicated, wherein an overflow port of a fine slurry tank body of the secondary grinding assembly is communicated with an inlet of a superfine slurry tank of the mixing assembly; a liquid outlet of the superfine slurry tank is communicated with a liquid inlet of the reflux pump, and a liquid outlet of the reflux pump is communicated with a liquid inlet pipe of the secondary grinding assembly through a first connecting pipe; the liquid outlet of the reflux pump further communicates with an inlet pipe of the primary grinding assembly through a second connecting pipe. According to the device, reasonable three-peak grain size distribution is formed through a circulating grinding and stirring mixing structure, the coal slurry concentration and mixing uniformity are improved, the fluidity, stability and reaction activity are improved, the flow field of the gasification furnace is stabilized, and the energy consumption and the production cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal slurry grinding technology, and specifically to a coal slurry grinding device. Background Technology

[0002] Rod milling technology is a technique for processing pulverized coal into a slurry with a specific particle size distribution. This technology primarily utilizes the friction between steel rods and pulverized coal to achieve particle crushing and refinement. The slurry produced by rod milling exhibits good fluidity and stability and can be used in modern coal chemical gasification processes. Low-pressure coal slurry enrichment technology, on the other hand, is a process that increases the concentration of coal slurry by altering its physical properties at lower pressures.

[0003] Existing coal slurry grinding devices have significant shortcomings. For example, Chinese utility model patent CN215855937U discloses a coal slurry grinding device, including a coal mill and a coal slurry tank, as well as a coal slurry thickening pump. The coal slurry outlet at the bottom of the tank is connected to the thickening pump, and the pump has two parallel branch pipes downstream: one thickening pipe connects to the coal mill feed port, and the other return pipe connects to the coal slurry inlet at the top of the tank. Although this device increases the coal slurry concentration through secondary grinding, it still suffers from an unreasonable particle size distribution, resulting in limited improvement in coal slurry concentration and insufficient subsequent gasification conversion efficiency, making it difficult to significantly reduce production costs and save energy.

[0004] Traditional grinding devices generally suffer from low coal slurry concentration, which directly leads to reduced gasification conversion efficiency and fails to achieve the goals of reducing production costs and saving energy. At the same time, the coal slurry has poor fluidity, stability and atomization performance, and insufficient reactivity, which can easily lead to problems such as unstable flow field in the gasifier combustion chamber, local overheating of the furnace wall, and high combustible content in coarse slag and fine ash. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a coal slurry grinding device that, through a circulating grinding and stirring mixing structure, forms a reasonable three-peak particle size distribution, improves coal slurry concentration and mixing uniformity, enhances fluidity, stability and reactivity, stabilizes the gasifier flow field, and reduces energy consumption and production costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a coal slurry grinding device, comprising: a primary grinding component, a secondary grinding component, and a mixing component connected in sequence; the overflow port of the fine slurry tank body of the secondary grinding component is connected to the inlet of the ultrafine slurry tank of the mixing component; the discharge port of the ultrafine slurry tank is connected to the inlet of a reflux pump; the outlet of the reflux pump is connected to the inlet pipe of the secondary grinding component through a first connecting pipe; the outlet of the reflux pump is also connected to the inlet pipe of the primary grinding component through a second connecting pipe.

[0007] Furthermore, the primary grinding assembly includes a coarse slurry tank, a metering pump, the inlet pipe, a fine grinding mill body, and an outlet pipe; the outlet of the coarse slurry tank is connected to the inlet of the fine grinding mill body through the inlet pipe, the metering pump is installed at the outlet of the coarse slurry tank, and the outlet pipe is connected to the outlet of the fine grinding mill body.

[0008] Furthermore, the secondary grinding assembly includes the fine slurry tank body, the fine slurry pump, the inlet pipe, the ultrafine mill, and the outlet pipe; the outlet end of the outlet pipe is located above the open end of the fine slurry tank body, the outlet at the bottom of the fine slurry tank body is connected to the inlet of the ultrafine mill through the inlet pipe, the fine slurry pump is provided at the outlet of the fine slurry tank body, and the outlet pipe is connected to the outlet of the ultrafine mill.

[0009] Furthermore, the mixing assembly includes a flow pipe, a delivery pump, an ultrafine slurry tank, a delivery pipe, a first connecting pipe, a second connecting pipe, and a reflux pump; the overflow port of the ultrafine slurry tank body is connected to the inlet end of the flow pipe, the outlet end of the flow pipe is connected to the inlet end of the ultrafine slurry tank, and the delivery pump is installed on the flow pipe; the delivery pipe is connected to the outlet of the ultrafine slurry tank, the outlet end of the delivery pipe is connected to the inlet ends of the first connecting pipe and the second connecting pipe respectively, and the reflux pump is installed on the first connecting pipe and the second connecting pipe respectively.

[0010] Furthermore, a stirrer is provided inside the ultrafine slurry tank.

[0011] Compared with the prior art, the present invention provides a coal slurry grinding device with the following advantages:

[0012] 1. This device employs a three-stage grinding structure consisting of primary grinding, secondary ultrafine grinding, and mixed reflux. The mixed fine and ultrafine slurries are then pumped to the fine grinding mill and the ultrafine grinding mill via a delivery pump, ultimately forming a three-peak particle size distribution of the coal slurry. This results in a more rational particle size distribution of the finished gasified coal slurry, effectively increasing the coal slurry concentration and solving the problem of insufficient gasification conversion efficiency caused by low coal slurry concentration in traditional devices.

[0013] 2. Reasonable particle size distribution not only increases the coal slurry concentration, but also significantly improves the fluidity, stability and atomization performance of the coal slurry, enhances the reactivity of the coal slurry, is conducive to the stability of the flow field in the gasifier combustion chamber, effectively reduces the phenomenon of local overheating of the furnace wall, reduces the content of combustibles in coarse slag and fine ash, and further reduces production costs and energy consumption. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the initial grinding assembly of this utility model.

[0017] Figure 3 This is a schematic diagram of the secondary grinding component of this utility model.

[0018] Figure 4 This is a schematic diagram of the structural hybrid component of this utility model.

[0019] The components are as follows: 1. Primary grinding assembly; 101. Coarse slurry tank; 102. Metering pump; 103. Inlet pipe; 104. Fine grinding mill body; 105. Outlet pipe; 2. Secondary grinding assembly; 201. Fine slurry tank body; 202. Fine slurry pump; 203. Liquid inlet pipe; 204. Ultrafine grinding mill; 205. Discharge pipe; 3. Mixing assembly; 301. Flow pipe; 302. Transfer pump; 303. Ultrafine slurry tank; 304. Transfer pipe; 305. First connecting pipe; 306. Second connecting pipe; 307. Return pump. Detailed Implementation

[0020] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, 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 this utility model based on the specific circumstances.

[0023] Please see Figure 1 - Figure 4 In this embodiment, a coal slurry grinding device includes: a primary grinding component 1, a secondary grinding component 2, and a mixing component 3 connected in sequence. The overflow port of the fine slurry tank body 201 of the secondary grinding component 2 is connected to the inlet of the ultrafine slurry tank 303 of the mixing component 3; the discharge port of the ultrafine slurry tank 303 is connected to the inlet of the reflux pump 307; the outlet of the reflux pump 307 is connected to the inlet pipe 203 of the secondary grinding component 2 through a first connecting pipe 305; and the outlet of the reflux pump 307 is also connected to the inlet pipe 103 of the primary grinding component 1 through a second connecting pipe 306.

[0024] The primary grinding assembly 1 includes a coarse slurry tank 101, a metering pump 102, an inlet pipe 103, a fine grinding mill body 104, and an outlet pipe 105. The outlet of the coarse slurry tank 101 is connected to the inlet of the fine grinding mill body 104 through the inlet pipe 103. The metering pump 102 is installed at the outlet of the coarse slurry tank 101, and the outlet pipe 105 is connected to the outlet of the fine grinding mill body 104.

[0025] The secondary grinding assembly 2 includes a fine slurry tank body 201, a fine slurry pump 202, an inlet pipe 203, an ultrafine mill 204, and an outlet pipe 205. The outlet end of the outlet pipe 105 is located above the open end of the fine slurry tank body 201. The outlet at the bottom of the fine slurry tank body 201 is connected to the inlet of the ultrafine mill 204 through the inlet pipe 203. A fine slurry pump 202 is installed at the outlet of the fine slurry tank body 201, and an outlet pipe 205 is connected to the outlet of the ultrafine mill 204.

[0026] The mixing component 3 includes a flow pipe 301, a delivery pump 302, an ultrafine slurry tank 303, a delivery pipe 304, a first connecting pipe 305, a second connecting pipe 306, and a reflux pump 307. The overflow port of the ultrafine slurry tank body 201 is connected to the liquid inlet of the flow pipe 301, and the liquid outlet of the flow pipe 301 is connected to the liquid inlet of the ultrafine slurry tank 303. The delivery pump 302 is installed on the flow pipe 301. The delivery pipe 304 is connected to the liquid outlet of the ultrafine slurry tank 303. The liquid outlet of the delivery pipe 304 is connected to the liquid inlet of the first connecting pipe 305 and the second connecting pipe 306 respectively. The reflux pump 307 is installed on the first connecting pipe 305 and the second connecting pipe 306 respectively. A stirrer is installed in the ultrafine slurry tank 303.

[0027] Working process: When using this device, the coarse slurry (a mixture of coal powder and water, with a coal powder mass fraction of 57%) is first poured into the coarse slurry tank 101. Then, after being metered by the metering pump 102 at the outlet of the coarse slurry tank 101, it is transported through the inlet pipe 103 to the fine grinding mill body 104 for initial grinding. The ground fine slurry (overall particle size D90 = 80-200 μm) flows into the fine slurry tank body 201 through the outlet pipe 105 for storage. Within the tank, the fine slurry naturally settles due to particle gravity differences, forming an interlayer distribution: the lower part of the tank (near the bottom outlet area) contains coarser fine slurry (D90 = 80-200 μm). The upper part of the tank (near the overflow port area) contains finer slurry (D90=80-120μm). First, the fine slurry in the upper part of the fine slurry tank body 201 flows into the flow pipe 301 through the overflow port of the tank body. Under the action of the delivery pump 302 on the flow pipe 301, it is delivered into the ultrafine slurry tank 303 in a quantitative manner. Then, the fine slurry in the lower part of the fine slurry tank body 201 flows out through the liquid outlet at its bottom. After the flow rate is precisely controlled by the fine slurry pump 202, it is quantitatively delivered to the ultrafine mill 204 through the liquid inlet pipe 203 for further ultrafine grinding.

[0028] The ultrafine slurry (D90=20-40μm) after grinding by the ultrafine mill 204 flows into the ultrafine slurry tank 303 through the discharge pipe 205. The agitator in the ultrafine slurry tank 303 operates and stirs for 10-20 minutes to fully mix the fine slurry and the ultrafine slurry. A concentration detection device is installed in the ultrafine slurry tank 303 to monitor the concentration of the mixed coal slurry in real time, and the target concentration is controlled at 61-65%.

[0029] Based on the concentration test results, the return path and flow distribution of the mixed coal slurry are adjusted using return pump 307:

[0030] When the coal slurry concentration is detected to be below 61%, the return pump 307 increases the conveying flow rate of the second connecting pipe 306 and reduces the conveying flow rate of the first connecting pipe 305. More mixed coal slurry is sent into the inlet pipe 103 of the primary grinding component 1 through the second connecting pipe 306. After mixing with the newly added coarse slurry, it participates in the primary grinding. The particles are refined by supplementing particle grinding, thereby rapidly increasing the coal slurry concentration.

[0031] When the coal slurry concentration is detected to be between 61-65% but close to the lower limit, the return pump 307 increases the conveying flow rate of the first connecting pipe 305 and decreases the conveying flow rate of the second connecting pipe 306. More mixed coal slurry is sent to the inlet pipe 203 of the secondary grinding component 2 through the first connecting pipe 305. After mixing with part of the fine slurry discharged from the fine slurry tank body 201, it participates in the secondary ultrafine grinding. The concentration is kept stable by finely adjusting the particle size, and the three-peak particle size distribution is further optimized.

[0032] When the coal slurry concentration is detected to reach the target range of 61-65%, the coal slurry in the ultrafine slurry tank 303 is discharged and sent to the subsequent gasification process to ensure that the gasification conversion efficiency meets the process requirements. When the coal slurry concentration is detected to be lower than 61%, the discharge of coal slurry is stopped.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal slurry grinding device, characterized in that, include: The primary grinding component (1), secondary grinding component (2), and mixing component (3) are connected in sequence. The overflow port of the fine slurry tank body (201) of the secondary grinding component (2) is connected to the inlet of the ultrafine slurry tank (303) of the mixing component (3). The drain port of the ultrafine slurry tank (303) is connected to the inlet of the reflux pump (307). The outlet of the reflux pump (307) is connected to the inlet pipe (203) of the secondary grinding component (2) through the first connecting pipe (305). The outlet of the reflux pump (307) is also connected to the inlet pipe (103) of the primary grinding component (1) through the second connecting pipe (306).

2. The coal slurry grinding device according to claim 1, characterized in that, The primary grinding assembly (1) includes a coarse slurry tank (101), a metering pump (102), an inlet pipe (103), a fine grinding mill body (104), and an outlet pipe (105). The outlet of the coarse slurry tank (101) is connected to the inlet of the fine grinding mill body (104) through the inlet pipe (103). The metering pump (102) is installed at the outlet of the coarse slurry tank (101), and the outlet pipe (105) is connected to the outlet of the fine grinding mill body (104).

3. The coal slurry grinding device according to claim 2, characterized in that, The secondary grinding assembly (2) includes the fine slurry tank body (201), the fine slurry pump (202), the inlet pipe (203), the ultrafine mill (204), and the outlet pipe (205); the outlet end of the outlet pipe (105) is located above the opening of the fine slurry tank body (201), the outlet at the bottom of the fine slurry tank body (201) is connected to the inlet of the ultrafine mill (204) through the inlet pipe (203), the fine slurry pump (202) is provided at the outlet of the fine slurry tank body (201), and the outlet pipe (205) is connected to the outlet of the ultrafine mill (204).

4. The coal slurry grinding device according to claim 3, characterized in that, The mixing component (3) includes a flow pipe (301), a delivery pump (302), an ultrafine slurry tank (303), a delivery pipe (304), a first connecting pipe (305), a second connecting pipe (306), and a reflux pump (307). The overflow port of the fine slurry tank body (201) is connected to the liquid inlet of the flow pipe (301), and the liquid outlet of the flow pipe (301) is connected to the liquid inlet of the ultrafine slurry tank (303). The delivery pump (302) is installed on the flow pipe (301). The delivery pipe (304) is connected to the liquid outlet of the ultrafine slurry tank (303). The liquid outlet of the delivery pipe (304) is connected to the liquid inlet of the first connecting pipe (305) and the second connecting pipe (306), respectively. The reflux pump (307) is installed on the first connecting pipe (305) and the second connecting pipe (306), respectively.

5. A coal slurry grinding device according to claim 4, characterized in that, An agitator is provided inside the ultrafine slurry tank (303).

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