Coal gasification system

Abstract

The utility model provides a coal gasification system. The coal gasification system comprises a gasification furnace, a scrubber, a separator, a first connecting pipe and a second connecting pipe, the gasification furnace is provided with a synthesis gas discharge port, the scrubber is provided with a first gas inlet, a discharge port and a first water inlet allowing external water to enter the scrubber, and the separator is provided with an inlet, a first exhaust port and a first water discharge port; one end of the first connecting pipe is connected to the synthesis gas outlet, the other end of the first connecting pipe is connected to the first gas inlet, one end of the second connecting pipe is connected to the first discharge port, and the other end of the second connecting pipe is connected to the inlet. According to the cleaning device, the synthesis gas generated by the gasification furnace can be cleaned, so that the content of dust in the synthesis gas is reduced, the synthesis gas becomes cleaner, the phenomenon that downstream pipelines or equipment are blocked is prevented, and utilization of the synthesis gas is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of coal chemical industry, in particular to a coal gasification system. Background Art

[0002] As a key technology for clean and efficient utilization of coal resources, coal gasification technology has developed rapidly in recent years. Existing coal gasification technologies all use coal to be transported into a gasifier for gasification reaction to generate synthesis gas. Since the synthesis gas generated by the gasifier contains a large amount of dust, it is easy to cause tube furnaces or equipment to be blocked when transporting the synthesis gas downstream, which is not conducive to the utilization of the synthesis gas. Utility Model Content

[0003] The utility model aims to provide a coal gasification system, which can clean the synthesis gas produced by the gasifier, thereby reducing the dust content in the synthesis gas, making the synthesis gas cleaner, preventing blockage of downstream pipelines or equipment, and facilitating the utilization of the synthesis gas.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A coal gasification system, comprising: a gasifier, a scrubber, a separator, a first connecting pipe and a second connecting pipe;

[0006] The gasifier has a syngas outlet, the scrubber is provided with a first air inlet, an outlet and a first water inlet allowing external water to enter the scrubber, and the separator has an inlet, a first air outlet and a first water outlet;

[0007] One end of the first connecting pipe is connected to the synthesis gas outlet, and the other end is connected to the first air inlet, so that the synthesis gas generated by the gasifier can enter the scrubber through the first connecting pipe and mix with the water in the scrubber to form a gas-water mixture. One end of the second connecting pipe is connected to the first discharge port, and the other end is connected to the inlet, so that the gas-water mixture enters the separator through the second connecting pipe for gas-liquid separation, and the separated gas and liquid are discharged outside the separator through the first exhaust port and the first drain port respectively.

[0008] Preferably, it also includes a washing tower and a third connecting pipe;

[0009] The washing tower is provided with a second air inlet, a second air outlet and a second water inlet allowing external water to enter the washing tower;

[0010] One end of the third connecting pipe is connected to the first exhaust port, and the other end is connected to the second air inlet, so that the gas separated by the separator enters the washing tower through the third connecting pipe, and is discharged outside the washing tower through the second exhaust port after being washed by water in the washing tower.

[0011] Preferably, it further comprises a pre-wash tank, wherein the first connecting pipe comprises a first pipe section and a second pipe section;

[0012] The pre-wash tank is provided with a third air inlet, a third air outlet and a third water inlet for allowing external water to enter the pre-wash tank;

[0013] One end of the first pipe section is connected to the synthesis gas exhaust port, and the other end is connected to the third air inlet. One end of the second pipe section is connected to the third exhaust port, and the other end is connected to the first air inlet, so that the synthesis gas generated by the gasifier can enter the pre-wash tank through the first pipe section, and after being washed and heat exchanged with water in the pre-wash tank, enter the scrubber through the second pipe section.

[0014] Preferably, it further comprises a fourth connecting pipe;

[0015] A second drain outlet is provided on the washing tower, one end of the fourth connecting pipe is connected to the second drain outlet, and the other end is connected to the first water inlet, so that the water in the washing tower can enter the scrubber through the fourth connecting pipe.

[0016] Preferably, it further comprises a fifth connecting pipe;

[0017] One end of the fifth connecting pipe is connected to the third water inlet, and the other end is connected to the fourth connecting pipe, so that the water in the washing tower can enter the pre-washing tank through the fourth connecting pipe and the fifth connecting pipe;

[0018] and / or, further comprising a sixth connecting pipe;

[0019] The gasifier is provided with a fourth water inlet, one end of the sixth connecting pipe is connected to the fourth water inlet, and the other end is connected to the fourth connecting pipe, so that the water in the washing tower can enter the gasifier through the fourth connecting pipe and the sixth connecting pipe.

[0020] Preferably, it also includes a primary flash evaporation device and a seventh connecting pipe;

[0021] The primary flash evaporation device is provided with a third drain port and a fourth exhaust port, one end of the seventh connecting pipe is connected to the first drain port, and the other end is connected to the primary flash evaporation device, so that the liquid separated in the separator can enter the primary flash evaporation device through the seventh connecting pipe for flash evaporation, and the formed liquid part and gas part are discharged outside the primary flash evaporation device through the third drain port and the fourth exhaust port respectively.

[0022] Preferably, when the washing tower is included, an eighth connecting pipe is also included;

[0023] The washing tower is provided with a fifth drain port, one end of the eighth connecting pipe is connected to the fifth drain port, and the other end is connected to the first-stage flash evaporation device, so that the water in the washing tower can enter the first-stage flash evaporation device through the eighth connecting pipe for flash evaporation;

[0024] and / or, when the pre-wash tank is included, a ninth connecting pipe is also included;

[0025] A sixth drain port is provided on the pre-wash tank, one end of the ninth connecting pipe is connected to the sixth drain port, and the other end is connected to the primary flash evaporation device, so that the water in the washing tower can enter the primary flash evaporation device through the ninth connecting pipe for flash evaporation;

[0026] and / or, further comprising a tenth connecting pipe;

[0027] The gasifier is provided with a seventh drain port, one end of the tenth connecting pipe is connected to the seventh drain port, and the other end is connected to the primary flash evaporation device, so that the water in the washing tower can enter the primary flash evaporation device through the tenth connecting pipe for flash evaporation.

[0028] Preferably, it also includes a secondary flash evaporation device and an eleventh connecting pipe;

[0029] An eighth drain port and a fifth exhaust port are provided on the secondary flash evaporation device, one end of the eleventh connecting pipe is connected to the third drain port, and the other end is connected to the secondary flash evaporation device, so that the liquid discharged from the primary flash evaporation device can enter the secondary flash evaporation device through the eleventh connecting pipe for flash evaporation, and the formed liquid part and gas part are discharged outside the primary flash evaporation device through the eighth drain port and the fifth exhaust port respectively.

[0030] Preferably, when the washing tower is included, a high flash steam stripping tower, a twelfth connecting pipe and a thirteenth connecting pipe are also included;

[0031] The high flash steam stripping tower is provided with a fourth air inlet, a sixth air outlet and a ninth water outlet, one end of the twelfth connecting pipe is connected to the fourth air inlet, and the other end is connected to the fourth air outlet, so that the gas in the primary flash evaporation device can enter the high flash steam stripping tower through the twelfth connecting pipe, and the formed liquid part and gas part are discharged to the outside of the high flash steam stripping tower through the ninth water outlet and the sixth air outlet respectively;

[0032] A water replenishment port is provided on the washing tower, one end of the thirteenth connecting pipe is connected to the ninth drain port, and the other end is connected to the water replenishment port, so that the liquid in the high flash steam stripping tower can enter the washing tower through the thirteenth connecting pipe.

[0033] Preferably, it further comprises a fourteenth connecting pipe, one end of the fourteenth connecting pipe is connected to the thirteenth connecting pipe, and the other end is connected to the first water inlet, so that the liquid in the high flash steam stripping tower can enter the scrubber through the thirteenth connecting pipe and the fourteenth connecting pipe in sequence;

[0034] And / or, when the pre-wash tank is included, a fifteenth connecting pipe is further included, one end of the fifteenth connecting pipe is connected to the thirteenth connecting pipe, and the other end can be connected to the third water inlet, so that the liquid in the high flash steam stripping tower can enter the pre-wash tank through the thirteenth connecting pipe and the fifteenth connecting pipe in sequence;

[0035] And / or, when a fourth water inlet is provided on the gasifier, it further includes a sixteenth connecting pipe, one end of the sixteenth connecting pipe is connected to the thirteenth connecting pipe, and the other end can be connected to the fourth water inlet, so that the liquid in the high flash steam stripping tower can enter the gasifier through the thirteenth connecting pipe and the sixteenth connecting pipe in sequence.

[0036] The coal gasification system of the utility model adopts a technical scheme in which one end of the first connecting pipe is connected to the synthesis gas discharge port and the other end is connected to the first air inlet, so that the synthesis gas generated by the gasifier can enter the scrubber through the first connecting pipe and mix with the water in the scrubber to form a gas-water mixture. One end of the second connecting pipe is connected to the first discharge port, and the other end is connected to the first inlet, so that the gas-water mixture enters the separator through the second connecting pipe for gas-liquid separation, and the separated gas and liquid are discharged to the outside of the separator through the first exhaust port and the first drain port respectively. The synthesis gas generated by the gasifier can be cleaned, thereby reducing the dust content in the synthesis gas, making the synthesis gas cleaner, preventing blockage of downstream pipelines or equipment, and being beneficial to the utilization of the synthesis gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram of an embodiment of a coal gasification system of the present utility model.

[0038] In the figure: 1-gasifier; 2-scrubber; 3-separator; 4-first connecting pipe; 5-second connecting pipe; 6-syngas outlet; 7-first air inlet; 8-discharge outlet; 9-first water inlet; 10-inlet; 11-first exhaust outlet; 12-first drain outlet; 13-scrubber; 14-third connecting pipe; 15-second air inlet; 16-second exhaust outlet; 17-second water inlet; 18-pre-wash tank; 19-first pipe section; 20-second pipe section; 21-third air inlet; 22-third exhaust outlet; 23-third water inlet; 24-fourth connecting pipe; 25-second drain outlet; 26-third The fifth connecting pipe; 27-the sixth connecting pipe; 28-the fourth water inlet; 29-the first-stage flash evaporation device; 30-the seventh connecting pipe; 32-the fourth exhaust port; 33-the eighth connecting pipe; 34-the fifth drain port; 35-the ninth connecting pipe; 36-the sixth drain port; 37-the tenth connecting pipe; 38-the seventh drain port; 39-the second-stage flash evaporation device; 40-the eleventh connecting pipe; 41-the eighth drain port; 42-the fifth exhaust port; 43-the high flash steam lifting tower; 44-the twelfth connecting pipe; 45-the thirteenth connecting pipe; 46-the fourth air inlet; 47-the sixth exhaust port; 48-the ninth drain port; 20-the water replenishment port. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the utility model more clear, the coal gasification system of the utility model is further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0040] Embodiment 1

[0041] like Figure 1As shown, a coal gasification system comprises: a gasifier 1, a scrubber 2, a separator 3, a first connecting pipe 4 and a second connecting pipe 5. The gasifier 1 is provided with a syngas outlet 6, the scrubber 2 is provided with a first air inlet 7, an outlet 8 and a first water inlet 9 allowing external water to enter the scrubber 2, and the separator 3 is provided with an inlet 10, a first air outlet 11 and a first water outlet 12. One end of the first connecting pipe 4 is connected to the syngas outlet 6, and the other end is connected to the first air inlet 7, so that the syngas generated by the gasifier 1 can enter the scrubber 2 through the first connecting pipe 4 and mix with the water in the scrubber 2 to form a gas-water mixture, one end of the second connecting pipe 5 is connected to the first outlet 8, and the other end is connected to the inlet 10, so that the gas-water mixture can enter the separator 3 through the second connecting pipe 5 for gas-liquid separation, and the separated gas and liquid are discharged to the outside of the separator 3 through the first air outlet 11 and the first water outlet 12 respectively. It should be noted that the gas discharged from the first exhaust port 11 is the cleaned synthesis gas, at which point the dust content in this part of the synthesis gas has been greatly reduced, and the liquid discharged from the first drain port 12 is water containing dust inside. With such a technical solution, the synthesis gas discharged from the synthesis gas outlet 6 can be washed, thereby reducing the dust content in the synthesis gas, making the synthesis gas cleaner, and preventing the downstream pipeline or equipment from being blocked, which is beneficial to the utilization of the synthesis gas. In actual production, the scrubber 2 can be a Venturi scrubber, but is not limited thereto.

[0042] Embodiment 2

[0043] Based on the first embodiment, Figure 1 As shown, a washing tower 13 and a third connecting pipe 14 are also included.

[0044] The washing tower 13 is provided with a second air inlet 15, a second air outlet 16 and a second water inlet 17 for allowing external water to enter the washing tower 13. One end of the third connecting pipe 14 is connected to the first air outlet 11, and the other end is connected to the second air inlet 15, so that the gas separated by the separator 3 enters the washing tower 13 through the third connecting pipe 14, and is washed by water in the washing tower 13 and discharged to the outside of the washing tower 13 through the second air outlet 16. That is to say, the synthesis gas discharged from the first air outlet 11 is washed by the washing tower 13 and then discharged through the second air outlet 16. At this time, the dust content of the synthesis gas discharged from the second air outlet 16 is lower than that of the synthesis gas discharged from the first air outlet 11.

[0045] Embodiment 3

[0046] Based on the second embodiment, Figure 1As shown, the pre-wash tank 18 is also included, and the first connecting pipe 4 includes a first pipe section 19 and a second pipe section 20. The pre-wash tank 18 is provided with a third air inlet 21, a third air outlet 22, and a third water inlet 23 for allowing external water to enter the pre-wash tank 18. One end of the first pipe section 19 is connected to the synthesis gas outlet 6, and the other end is connected to the third air inlet 21, and one end of the second pipe section 20 is connected to the third air outlet 22, and the other end is connected to the first air inlet 7, so that the synthesis gas generated by the gasifier 1 can enter the pre-wash tank 18 through the first pipe section 19, and enter the scrubber 2 through the second pipe section 20 after being washed and heat-exchanged by water in the pre-wash tank 18. By adopting such a technical solution, after the synthesis gas is discharged from the synthesis gas outlet 6, it can be pre-cleaned by the pre-wash tank 18 before entering the scrubber 2. This can not only further improve the cleanliness of the synthesis gas, but also recover and reuse the heat in the synthesis gas discharged from the synthesis gas outlet 6 through the water in the pre-wash tank 18.

[0047] Preferably, if Figure 1 As shown, a fourth connecting pipe 24 is also included. A second drain port 25 is provided on the washing tower 13, one end of the fourth connecting pipe 24 is connected to the second drain port 25, and the other end is connected to the first water inlet 9, so that the water in the washing tower 13 can enter the scrubber 2 through the fourth connecting pipe 24, so as to realize the water supply from the washing tower 13 to the scrubber 2 through the fourth connecting pipe 24.

[0048] Preferably, Figure 1 As shown, the fifth connecting pipe 26 is also included. One end of the fifth connecting pipe 26 is connected to the third water inlet 23, and the other end is connected to the fourth connecting pipe 24, so that the water in the washing tower 13 can enter the pre-washing tank 18 through the fourth connecting pipe 24 and the fifth connecting pipe 26, so as to realize the water supply from the washing tower 13 to the pre-washing tank 18 through the fourth connecting pipe 24 and the fifth connecting pipe 26. At the same time, Figure 1 As shown, the sixth connecting pipe 27 is also included. The gasifier 1 has a fourth water inlet 28, one end of the sixth connecting pipe 27 is connected to the fourth water inlet 28, and the other end is connected to the fourth connecting pipe 24, so that the water in the washing tower 13 can enter the gasifier 1 through the fourth connecting pipe 24 and the sixth connecting pipe 27, so that the washing tower 13 supplies water to the gasifier 1 through the fourth connecting pipe 24 and the sixth connecting pipe 27.

[0049] Embodiment 4

[0050] Based on the first embodiment, the second embodiment and the third embodiment, as Figure 1As shown, it also includes a primary flash evaporation device 29 and a seventh connecting pipe 30. The primary flash evaporation device 29 is provided with a third drain port 31 and a fourth exhaust port 32. One end of the seventh connecting pipe 30 is connected to the first drain port 12 and the other end is connected to the primary flash evaporation device 29, so that the liquid separated in the separator 3 can enter the primary flash evaporation device 29 through the seventh connecting pipe 30 for flash evaporation, and the formed liquid part and gas part are respectively discharged to the outside of the primary flash evaporation device 29 through the third drain port 31 and the fourth exhaust port 32. It should be noted that at this time, water vapor is discharged from the fourth exhaust port 32, and water containing dust is discharged from the third drain port 31. In this way, the water in the system can be recycled to avoid wasting water resources.

[0051] Preferably, if Figure 1 As shown, when the washing tower 13 is included, an eighth connecting pipe 33 is also included. A fifth drain port 34 is provided on the washing tower 13, one end of the eighth connecting pipe 33 is connected to the fifth drain port 34, and the other end is connected to the primary flash evaporation device 29, so that the water in the washing tower 13 can enter the primary flash evaporation device 29 through the eighth connecting pipe 33 for flash evaporation. At this time, the water discharged from the fifth drain port 34 is the dust-containing water after the synthesis gas is washed. After entering the primary flash evaporation device 29, the water is separated by the primary flash evaporation device 29 into water vapor discharged from the fourth exhaust port 32 and water containing dust discharged from the third drain port 31.

[0052] Better, such as Figure 1 As shown, when the pre-wash tank 18 is included, a ninth connecting pipe 35 is also included. A sixth drain port 36 is provided on the pre-wash tank 18, one end of the ninth connecting pipe 35 is connected to the sixth drain port 36, and the other end is connected to the primary flash evaporation device 29, so that the water in the washing tower 13 can enter the primary flash evaporation device 29 through the ninth connecting pipe 35 for flash evaporation; at this time, the water discharged from the sixth drain port 36 is the dust-containing water after the synthesis gas is washed, and after entering the primary flash evaporation device 29, the water is separated by the primary flash evaporation device 29 into water vapor discharged from the fourth exhaust port 32 and water containing dust discharged from the third drain port 31.

[0053] Meanwhile, the tenth connecting pipe 37 is also included. The gasifier 1 is provided with a seventh drain port 38, one end of the tenth connecting pipe 37 is connected to the seventh drain port 38, and the other end is connected to the primary flash evaporation device 29, so that the water in the washing tower 13 can enter the primary flash evaporation device 29 through the tenth connecting pipe 37 for flash evaporation. After the water discharged from the gasifier 1 enters the primary flash evaporation device 29, it is separated by the primary flash evaporation device 29 into water vapor discharged from the fourth exhaust port 32 and water containing dust discharged from the third drain port 31.

[0054] Embodiment 5

[0055] Based on the fourth embodiment, Figure 1 As shown, it also includes a secondary flash evaporation device 39 and an eleventh connecting pipe 40. An eighth drain port 41 and a fifth exhaust port 42 are provided on the secondary flash evaporation device 39. One end of the eleventh connecting pipe 40 is connected to the third drain port 31, and the other end is connected to the secondary flash evaporation device 39, so that the liquid discharged from the primary flash evaporation device 29 can enter the secondary flash evaporation device 39 through the eleventh connecting pipe 40 for flash evaporation, and the formed liquid part and gas part are respectively discharged to the outside of the primary flash evaporation device 29 through the eighth drain port 41 and the fifth exhaust port 42. It should be noted that at this time, water vapor is discharged from the fifth exhaust port 42, and water containing dust is discharged from the eighth drain port 41. In this way, the water discharged from the primary flash evaporation device 29 can be further processed by the secondary flash evaporation device 39, further avoiding the waste of water resources.

[0056] Embodiment 6

[0057] Based on the fourth embodiment, Figure 1 As shown, when the washing tower 13 is included, a high flash steam stripping tower 43, a twelfth connecting pipe 44 and a thirteenth connecting pipe 45 are also included. The high flash steam stripping tower 43 is provided with a fourth air inlet 46, a sixth exhaust port 47 and a ninth drain port 48. One end of the twelfth connecting pipe 44 is connected to the fourth air inlet 46, and the other end is connected to the fourth exhaust port 32, so that the gas in the primary flash evaporation device 29 can enter the high flash steam stripping tower 43 through the twelfth connecting pipe 44, and the formed liquid part and gas part are discharged out of the high flash steam stripping tower 43 through the ninth drain port 48 and the sixth exhaust port 47 respectively. A water replenishment port 49 is provided on the washing tower 13, one end of the thirteenth connecting pipe 45 is connected to the ninth drain port 48, and the other end is connected to the water replenishment port 49, so that the liquid in the high flash steam stripping tower 43 can enter the washing tower 13 through the thirteenth connecting pipe 45. By adopting such a technical solution, the water vapor discharged from the primary flash evaporation device 29 can enter the high flash steam stripping tower 43 to be liquefied into water and then flow back to the washing tower 13 through the thirteenth connecting pipe 45 for utilization.

[0058] In actual production, a fourteenth connecting pipe (not shown) is also included, one end of which is connected to the thirteenth connecting pipe 45, and the other end is connected to the first water inlet 9, so that the liquid in the high flash steam stripping tower 43 can enter the scrubber 2 through the thirteenth connecting pipe 45 and the fourteenth connecting pipe in sequence. That is to say, the water vapor discharged from the primary flash evaporation device 29 can enter the high flash steam stripping tower 43, liquefy into water, and then enter the scrubber 2 through the thirteenth connecting pipe 45 and the fourteenth connecting pipe for use.

[0059] And / or, when the pre-wash tank 18 is included, a fifteenth connecting pipe (not shown) is also included, one end of the fifteenth connecting pipe is connected to the thirteenth connecting pipe 45, and the other end can be connected to the third water inlet 23, so that the liquid in the high flash steam stripping tower 43 can enter the pre-wash tank 18 through the thirteenth connecting pipe 45 and the fifteenth connecting pipe in sequence. That is to say, the water vapor discharged from the primary flash evaporation device 29 can enter the high flash steam stripping tower 43, liquefy into water, and then enter the pre-wash tank 18 through the thirteenth connecting pipe 45 and the fifteenth connecting pipe for use.

[0060] And / or, when the fourth water inlet 28 is provided on the upper gasifier 1, a sixteenth connecting pipe (not shown) is further included, one end of the sixteenth connecting pipe is connected to the thirteenth connecting pipe 45, and the other end can be connected to the fourth water inlet 28, so that the liquid in the high flash steam stripping tower 43 can enter the gasifier 1 through the thirteenth connecting pipe 45 and the sixteenth connecting pipe in sequence. That is to say, the water vapor discharged from the primary flash evaporation device 29 can enter the high flash steam stripping tower 43, be liquefied into water, and then enter the gasifier 1 through the thirteenth connecting pipe 45 and the sixteenth connecting pipe for use.

[0061] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A coal gasification system, characterized in that: include: A gasifier (1), a scrubber (2), a separator (3), a first connecting pipe (4), and a second connecting pipe (5); The gasifier (1) has a synthesis gas outlet (6), the scrubber (2) is provided with a first air inlet (7), an outlet (8) and a first water inlet (9) for allowing external water to enter the scrubber (2), and the separator (3) has an inlet (10), a first air outlet (11) and a first water outlet (12); One end of the first connecting pipe (4) is connected to the synthesis gas outlet (6), and the other end is connected to the first air inlet (7), so that the synthesis gas generated by the gasifier (1) can enter the scrubber (2) through the first connecting pipe (4) and mix with the water in the scrubber (2) to form a gas-water mixture. One end of the second connecting pipe (5) is connected to the first discharge port (8), and the other end is connected to the inlet (10), so that the gas-water mixture enters the separator (3) through the second connecting pipe (5) for gas-liquid separation, and the separated gas and liquid are discharged to the outside of the separator (3) through the first exhaust port (11) and the first drain port (12) respectively.

2. The coal gasification system according to claim 1, characterized in that: It also includes a washing tower (13) and a third connecting pipe (14); The washing tower (13) is provided with a second air inlet (15), a second air outlet (16), and a second water inlet (17) for allowing external water to enter the interior of the washing tower (13); One end of the third connecting pipe (14) is connected to the first exhaust port (11), and the other end is connected to the second air inlet (15), so that the gas separated by the separator (3) enters the washing tower (13) through the third connecting pipe (14), and is washed by water in the washing tower (13) and then discharged out of the washing tower (13) through the second exhaust port (16).

3. The coal gasification system according to claim 2, characterized in that: It also includes a pre-wash tank (18), wherein the first connecting pipe (4) includes a first pipe section (19) and a second pipe section (20); The pre-wash tank (18) is provided with a third air inlet (21), a third air outlet (22), and a third water inlet (23) for allowing external water to enter the interior of the pre-wash tank (18); One end of the first pipe section (19) is connected to the synthesis gas outlet (6), and the other end is connected to the third air inlet (21); one end of the second pipe section (20) is connected to the third exhaust port (22), and the other end is connected to the first air inlet (7), so that the synthesis gas generated by the gasifier (1) can enter the pre-wash tank (18) through the first pipe section (19), and after being washed and heat-exchanged with water in the pre-wash tank (18), enter the scrubber (2) through the second pipe section (20).

4. The coal gasification system according to claim 3, characterized in that: Also includes a fourth connecting pipe (24); A second drain port (25) is provided on the washing tower (13); one end of the fourth connecting pipe (24) is connected to the second drain port (25), and the other end is connected to the first water inlet (9), so that water in the washing tower (13) can enter the washing device (2) through the fourth connecting pipe (24).

5. The coal gasification system according to claim 4, characterized in that: Also includes a fifth connecting pipe (26); One end of the fifth connecting pipe (26) is connected to the third water inlet (23), and the other end is connected to the fourth connecting pipe (24), so that water in the washing tower (13) can enter the pre-washing tank (18) through the fourth connecting pipe (24) and the fifth connecting pipe (26); and / or, further comprising a sixth connecting pipe (27); The gasifier (1) has a fourth water inlet (28), one end of the sixth connecting pipe (27) is connected to the fourth water inlet (28), and the other end is connected to the fourth connecting pipe (24), so that water in the washing tower (13) can enter the gasifier (1) through the fourth connecting pipe (24) and the sixth connecting pipe (27).

6. The coal gasification system according to any one of claims 1 to 5, characterized in that: It also includes a first-stage flash evaporation device (29) and a seventh connecting pipe (30); The primary flash evaporation device (29) is provided with a third drain port (31) and a fourth exhaust port (32); one end of the seventh connecting pipe (30) is connected to the first drain port (12), and the other end is connected to the primary flash evaporation device (29), so that the liquid separated in the separator (3) can enter the primary flash evaporation device (29) through the seventh connecting pipe (30) for flash evaporation, and the formed liquid part and gas part are discharged outside the primary flash evaporation device (29) through the third drain port (31) and the fourth exhaust port (32) respectively.

7. The coal gasification system according to claim 6, characterized in that: When the washing tower (13) is included, an eighth connecting pipe (33) is also included; The washing tower (13) is provided with a fifth drain port (34), one end of the eighth connecting pipe (33) is connected to the fifth drain port (34), and the other end is connected to the first-stage flash evaporation device (29), so that water in the washing tower (13) can enter the first-stage flash evaporation device (29) through the eighth connecting pipe (33) for flash evaporation; and / or, when a pre-wash tank (18) is included, a ninth connecting pipe (35) is also included; A sixth drain port (36) is provided on the pre-wash tank (18); one end of the ninth connecting pipe (35) is connected to the sixth drain port (36), and the other end is connected to the primary flash evaporation device (29), so that water in the washing tower (13) can enter the primary flash evaporation device (29) through the ninth connecting pipe (35) for flash evaporation; and / or, further comprising a tenth connecting pipe (37); The gasifier (1) is provided with a seventh drain port (38), one end of the tenth connecting pipe (37) is connected to the seventh drain port (38), and the other end is connected to the first-stage flash evaporation device (29), so that water in the washing tower (13) can enter the first-stage flash evaporation device (29) through the tenth connecting pipe (37) for flash evaporation.

8. The coal gasification system according to claim 6, characterized in that: It also includes a secondary flash evaporation device (39) and an eleventh connecting pipe (40); An eighth drain port (41) and a fifth exhaust port (42) are provided on the secondary flash evaporation device (39); one end of the eleventh connecting pipe (40) is connected to the third drain port (31), and the other end is connected to the secondary flash evaporation device (39), so that the liquid discharged from the primary flash evaporation device (29) can enter the secondary flash evaporation device (39) through the eleventh connecting pipe (40) for flash evaporation, and the formed liquid part and gas part are respectively discharged to the outside of the primary flash evaporation device (29) through the eighth drain port (41) and the fifth exhaust port (42).

9. The coal gasification system according to claim 6, characterized in that: When the washing tower (13) is included, it also includes a high flash steam stripping tower (43), a twelfth connecting pipe (44) and a thirteenth connecting pipe (45); The high flash steam stripping tower (43) is provided with a fourth air inlet (46), a sixth air outlet (47) and a ninth water outlet (48); one end of the twelfth connecting pipe (44) is connected to the fourth air inlet (46), and the other end is connected to the fourth air outlet (32), so that the gas in the primary flash evaporation device (29) can enter the high flash steam stripping tower (43) through the twelfth connecting pipe (44), and the formed liquid part and gas part are discharged to the outside of the high flash steam stripping tower (43) through the ninth water outlet (48) and the sixth air outlet (47) respectively; The washing tower (13) is provided with a water replenishment port (49), one end of the thirteenth connecting pipe (45) is connected to the ninth drain port (48), and the other end is connected to the water replenishment port (49), so that the liquid in the high flash steam stripping tower (43) can enter the washing tower (13) through the thirteenth connecting pipe (45).

10. The coal gasification system according to claim 9, characterized in that: It also includes a fourteenth connecting pipe, one end of the fourteenth connecting pipe is connected to the thirteenth connecting pipe (45), and the other end is connected to the first water inlet (9), so that the liquid in the high flash steam stripping tower (43) can enter the scrubber (2) through the thirteenth connecting pipe (45) and the fourteenth connecting pipe in sequence; and / or, when the pre-wash tank (18) is included, further comprising a fifteenth connecting pipe, one end of the fifteenth connecting pipe being connected to the thirteenth connecting pipe (45), and the other end being connectable to the third water inlet (23), so that the liquid in the high flash steam stripping tower (43) can enter the pre-wash tank (18) through the thirteenth connecting pipe (45) and the fifteenth connecting pipe in sequence; And / or, when the gasifier (1) is provided with a fourth water inlet (28), it further comprises a sixteenth connecting pipe, one end of the sixteenth connecting pipe being connected to the thirteenth connecting pipe (45), and the other end being connectable to the fourth water inlet (28), so that the liquid in the high flash steam stripping tower (43) can enter the gasifier (1) through the thirteenth connecting pipe (45) and the sixteenth connecting pipe in sequence.

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