Coal water slurry gasification coal slurry concentration system

Abstract

The utility model discloses a coal water slurry gasification coal water slurry concentration system, it includes rod grinder, drum screen, coarse material groove, fine grinder, de-ironer, filter, molecular vibration appearance and fine slurry tank, the discharge port of rod grinder communicates with the feed inlet of drum screen, the undersize outlet of drum screen communicates with the feed inlet of coarse material groove, and the discharge port of coarse material groove communicates with the feed inlet of fine grinder and discharge pump respectively, fine grinder, de-ironer, filter, molecular vibration appearance and fine slurry tank communicate in proper order, and the discharge port of fine slurry tank communicates with the feed inlet of rod grinder and drum screen respectively. Advantageous effects: the utility model discloses a coal water slurry gasification coal water slurry concentration system, reduces the granularity (average particle size is less than or equal to 20um) of coal water slurry, and fine slurry is fully mixed with coal water slurry in the inside of rod grinder and drum screen, and the high concentration coal water slurry with good fluidity and the concentration of 63.0% above is outputted, is favorable to improve the preparation efficiency of coal water slurry, reduces the preparation cost of coal water slurry.

Description

Technical Field

[0001] This utility model patent belongs to the field of coal chemical technology, specifically relating to a coal slurry enrichment system for coal-water slurry gasification. Background Technology

[0002] Coal-water slurry is an important raw material in the gasification process, and pressurized coal-water slurry gasification is one of many gasification technologies. A persistent technical problem is the generally low slurry concentration (typically maintained at around 61.5%) during the preparation of coal-water slurry. Currently, due to the low concentration, the slurry contains a large amount of water. Excessive water wastes system heat; to maintain the gasifier temperature, the system must add more oxygen, allowing carbon and oxygen to react and produce carbon dioxide, releasing more heat to maintain heat balance, thus reducing gasification efficiency. Furthermore, this leads to a relatively low effective gas content in the coal-water slurry gasifier, generally maintained at around 80%, with CO2 content approaching 20%.

[0003] Currently, coal properties, particle size distribution, and additives are the three key elements of coal-water slurry technology. Particle size distribution is one of the important factors in evaluating the quality of coal-water slurry, which necessitates controlling the particle size distribution to ensure inter-particle packing in order to increase the slurry concentration. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a coal slurry enrichment system for coal gasification that improves coal slurry concentration and reduces the cost of coal slurry preparation.

[0005] This utility model discloses a coal slurry thickening system for coal-water slurry gasification, comprising a rod mill, a drum screen, a coarse material trough, a fine mill, an iron remover, a filter, a molecular vibrator, and a fine slurry tank. The discharge port of the rod mill is connected to the inlet of the drum screen, the undersize outlet of the drum screen is connected to the inlet of the coarse material trough, and the discharge port of the coarse material trough is connected to the inlets of the fine mill and the discharge pump, respectively. The fine mill, the iron remover, the filter, the molecular vibrator, and the fine slurry tank are connected in sequence, and the discharge port of the fine slurry tank is connected to the inlets of the rod mill and the drum screen, respectively.

[0006] Furthermore, the oversize outlet of the rotary screen is connected to the feed inlet of the rod mill.

[0007] Furthermore, the fine grinding mill includes a casing, a drive motor, a transmission shaft, a transmission sleeve, and grinding discs; a discharge pipe is connected to the upper side of one side of the casing; a feed pipe is connected to the lower side of the other side of the casing; a drive motor is fixed on the upper side of the casing, and the output end of the drive motor is connected to the transmission shaft; a transmission sleeve is rotatably sleeved on the transmission shaft; the transmission shaft and the transmission sleeve are connected by a transmission structure, and the rotation directions of the transmission shaft and the transmission sleeve are opposite; grinding discs are fixedly sleeved on the lower outer sides of the transmission sleeve and the transmission shaft, respectively; and several grinding strips are fixed on the inner wall of the casing around the two grinding discs.

[0008] Furthermore, the grinding disc includes an inner cylinder and an outer cylinder, and a plurality of crushing blades are fixed between the inner cylinder and the outer cylinder.

[0009] Furthermore, the transmission structure includes a transmission box, which is fixed to the inner wall of the housing above the discharge pipe. A first bevel gear is rotatably arranged on the side wall of the transmission box, and second bevel gears are respectively sleeved and fixed on the upper end of the transmission shaft and the upper end of the transmission sleeve. The first bevel gear meshes with the two second bevel gears for transmission.

[0010] Furthermore, a filter screen is fixedly installed at the discharge port of the machine casing.

[0011] Furthermore, a cleaning pipe is connected to the discharge pipe, and an end cap is provided at the opening of the cleaning pipe.

[0012] Advantages of this utility model:

[0013] 1. This utility model discloses a coal slurry enrichment system for coal-water slurry gasification. Raw coal, water, and additives are ground by a rod mill, and then screened by a drum screen. The coal slurry that meets the particle size standard is sent to a coarse feed tank. Process water is added to the coarse feed tank for dilution, and then the coarse slurry is pumped to a fine mill for ultrafine grinding by a coarse slurry pump through proportional adjustment. The fine mill grinds the coal slurry to form a fine slurry, reducing the particle size of the coal-water slurry (average particle size ≤20μm). The fine slurry is fully mixed with the coal slurry inside the rod mill and at the drum screen, producing a high-concentration coal slurry with good fluidity and a concentration of 63.0% or higher.

[0014] 2. The present invention discloses a coal slurry enrichment system for coal-water slurry gasification. The coal slurry ground by a fine mill is then subjected to an iron remover to remove iron impurities, thereby preventing iron impurities in the coal-water slurry from entering subsequent pumps and other equipment and affecting their operation. This system is beneficial for improving the preparation efficiency of coal-water slurry and reducing its preparation cost.

[0015] 3. The present invention discloses a coal slurry enrichment system for coal-water slurry gasification, wherein the rotating grinding disc and grinding strip of the fine grinding mill further grind the coal slurry, and the two grinding discs rotating in opposite directions grind the coal slurry, thereby fully grinding the coal slurry into a very fine state and improving the grinding effect of the coal slurry.

[0016] 4. The present invention discloses a coal slurry enrichment system for coal-water slurry gasification, wherein the cleaning structure of the filter screen of the fine grinding mill is simple. When the equipment stops running, the end cap of the cleaning pipe is opened, and a high-pressure water gun is inserted into the discharge pipe to backwash the filter screen, thereby cleaning the filter screen. The cleaning cost is low and the normal operation of the equipment is guaranteed. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of a fine grinding mill.

[0020] Figure 3 for Figure 2 A cross-sectional schematic diagram of section AA.

[0021] Figure 4 This is a schematic diagram of the grinding disc.

[0022] 1. Rod mill, 2. Rotary drum screen, 3. Coarse material trough, 4. Fine grinding mill, 401. Casing, 402. Drive motor, 403. Drive shaft, 404. Drive sleeve, 405. Grinding disc, 405. Inner cylinder, 4051. Outer cylinder, 4052. Crushing blade, 4053. Discharge pipe, 406. Feed pipe, 407. Transmission structure, 408. Transmission box, 4081. First bevel gear, 4082. Second bevel gear, 4083. Grinding strip, 409. Filter screen, 410. Cleaning pipe, 411. End cap, 412. Iron remover, 5. Filter, 6. Molecular vibrator, 7. Fine slurry trough, 8. Discharge pump, 9. Detailed Implementation

[0023] The present invention will be further described in detail below through embodiments.

[0024] Example: Figure 1-4As shown, a coal-water slurry gasification coal slurry thickening system includes a rod mill 1, a drum screen 2, a coarse feed trough 3, a fine mill 4, an iron remover 5, a filter 6, a molecular vibrator 7, and a fine slurry tank 8. The discharge port of the rod mill 1 is connected to the feed port of the drum screen 2, the undersize outlet of the drum screen 2 is connected to the feed port of the coarse feed trough 3, and the discharge port of the coarse feed trough 3 is connected to the feed ports of the fine mill 4 and the discharge pump 9, respectively. The fine mill 4, the iron remover 5, the filter 6, the molecular vibrator 7, and the fine slurry tank 8 are connected in sequence, and the discharge port of the fine slurry tank 8 is connected to the feed ports of the rod mill 1 and the drum screen 2, respectively. The oversize outlet of the drum screen 2 is connected to the feed port of the rod mill 1.

[0025] The fine grinding mill 4 includes a housing 401, a drive motor 402, a transmission shaft 403, a transmission sleeve 404, and a grinding disc 405. A discharge pipe 406 is connected to the upper side of one side of the housing 401, and a feed pipe 407 is connected to the lower side of the other side of the housing 401. The drive motor 402 is fixed on the upper side of the housing 401, and the output end of the drive motor 402 is connected to the transmission shaft 403. The transmission sleeve 404 is rotatably sleeved on the transmission shaft 403. The transmission shaft 403 and the transmission sleeve 404 are connected by a transmission structure 408, and the rotation directions of the transmission shaft 403 and the transmission sleeve 404 are opposite. Grinding discs 405 are fixedly sleeved on the lower outer sides of the transmission sleeve 404 and the transmission shaft 403, respectively. Several grinding strips 409 are fixed on the inner wall of the housing 401 around the two grinding discs 405.

[0026] The grinding disc 405 includes an inner cylinder 4051 and an outer cylinder 4052, and a number of crushing blades 4053 are fixed between the inner cylinder 4051 and the outer cylinder 4052.

[0027] The transmission structure 408 includes a transmission box 4081. The transmission box 4081 is fixed on the inner wall of the housing 401 above the discharge pipe 406. A first bevel gear 4082 is rotatably arranged on the side wall of the transmission box 4081. A second bevel gear 4083 is respectively sleeved and fixed on the upper end of the transmission shaft 403 and the upper end of the transmission sleeve 404. The first bevel gear 4082 meshes with the two second bevel gears 4083 for transmission.

[0028] A filter screen 410 is fixedly installed at the discharge port of the housing 401, a cleaning pipe 411 is connected to the discharge pipe 406, and an end cap 412 is installed at the opening of the cleaning pipe 411.

[0029] Working principle: Raw coal, water, and additives are ground by a rod mill 1, and then screened by a drum screen 2. Coal slurry that meets the particle size standard is sent to a coarse feed tank 3. Process water is added to the coarse feed tank 3 for dilution, and then the coarse slurry is pumped by a coarse slurry pump through proportional adjustment to a fine mill 4 for ultrafine grinding. The fine mill 4 grinds the coal slurry to form a fine slurry, reducing the particle size of the coal-water slurry (average particle size ≤20μm). The fine slurry passes through an iron remover 5 to remove iron impurities, preventing iron impurities from entering subsequent pumps and other equipment, which would affect the operation of the pumps and improve the preparation efficiency and reduce the preparation cost of coal-water slurry. After iron removal, the fine slurry is filtered by a filter 6 and then passed through a molecular vibrator 7. The molecular vibrator 7 further improves the quality of the coal slurry and flows by gravity into a fine slurry tank 8. The fine slurry in the fine slurry tank 8 is fully mixed with the coal slurry inside the rod mill 1 and at the drum screen 2, producing a high-concentration coal slurry with good fluidity and a concentration of over 63.0%.

[0030] After the coal slurry in the coarse feed trough 3 enters the fine grinding mill 4, the drive motor 402 starts, driving the transmission shaft 403 to rotate. The rotating transmission shaft 403 drives the transmission sleeve 404 to rotate in the same direction as the rotation of the transmission shaft 403 through the second bevel gear 4083-first bevel gear 4082-second bevel gear 4083. The rotating transmission shaft 403 and the transmission sleeve 404 respectively drive the grinding disc 405 to rotate. The rotating grinding disc 405 and the grinding strip 409 further grind the coal slurry. Moreover, the crushing blades 4053 of the two grinding discs 405 rotating in opposite directions grind the coal slurry, fully grinding the coal slurry into a very fine powder, thus improving the grinding effect of the coal slurry.

[0031] After being ground into smaller coal-water slurry particles, the slurry rises and is then filtered through filter screen 410 before flowing out through discharge pipe 406. When the equipment stops running, the end cap 412 of cleaning pipe 411 is opened, and a high-pressure water gun is inserted into discharge pipe 406 to backwash filter screen 410, thus cleaning filter screen 410. The cleaning structure of filter screen 410 of this utility model is simple, the cleaning cost is low, and the normal operation of the equipment is guaranteed.

[0032] The above are preferred embodiments of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A coal water slurry gasification coal slurry concentration system, characterized by, It includes a rod mill, a drum screen, a coarse material trough, a fine mill, an iron remover, a filter, a molecular vibrator, and a fine slurry tank; the discharge port of the rod mill is connected to the feed port of the drum screen, the undersize outlet of the drum screen is connected to the feed port of the coarse material trough, and the discharge port of the coarse material trough is connected to the feed ports of the fine mill and the discharge pump respectively; the fine mill, the iron remover, the filter, the molecular vibrator, and the fine slurry tank are connected in sequence, and the discharge port of the fine slurry tank is connected to the feed ports of the rod mill and the drum screen respectively.

2. The coal water slurry gasification coal slurry concentration system according to claim 1, characterized in that, The outlet of the rotary drum screen is connected to the feed inlet of the rod mill.

3. A coal slurry enrichment system for coal-water slurry gasification according to claim 1 or 2, characterized in that, The fine grinding mill includes a casing, a drive motor, a transmission shaft, a transmission sleeve, and grinding discs. A discharge pipe is connected to the upper side of one side of the casing, and a feed pipe is connected to the lower side of the other side of the casing. The drive motor is fixed on the upper side of the casing, and the output end of the drive motor is connected to the transmission shaft. The transmission sleeve is rotatably mounted on the transmission shaft. The transmission shaft and the transmission sleeve are connected by a transmission structure, and the rotation directions of the transmission shaft and the transmission sleeve are opposite. Grinding discs are fixedly mounted on the lower outer sides of the transmission sleeve and the transmission shaft, respectively. Several grinding strips are fixed on the inner wall of the casing around the two grinding discs.

4. The coal slurry enrichment system for coal-water slurry gasification according to claim 3, characterized in that, The grinding disc includes an inner cylinder and an outer cylinder, and a plurality of crushing blades are fixed between the inner cylinder and the outer cylinder.

5. A coal slurry enrichment system for coal-water slurry gasification according to claim 3, characterized in that, The transmission structure includes a transmission box, which is fixed to the inner wall of the housing above the discharge pipe. A first bevel gear is rotatably arranged on the side wall of the transmission box. Second bevel gears are respectively sleeved and fixed at the upper end of the transmission shaft and the upper end of the transmission sleeve. The first bevel gear meshes with the two second bevel gears for transmission.

6. A coal slurry enrichment system for coal-water slurry gasification according to claim 5, characterized in that, A filter screen is fixedly installed at the discharge port of the machine casing.

7. A coal slurry enrichment system for coal-water slurry gasification according to claim 6, characterized in that, A cleaning pipe is connected to the discharge pipe, and an end cap is provided at the opening of the cleaning pipe.

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