Coal water slurry gasification system

Abstract

The utility model relates to the technical field of water-coal-slurry gasification systems, in particular to a water-coal-slurry gasification system, which is characterized in that a high-yield main coal mill and a high-yield auxiliary coal mill are connected with a first-stage gasification furnace, so that when the yield needs to be increased, one of a low-yield main coal mill and one of a low-yield auxiliary coal mills can be continuously kept for standby and one of the low-yield main coal mill and the low-yield auxiliary coal mill can be used at the same time; meanwhile, the material yield is increased by increasing the load of the high-yield main coal mill or the high-yield auxiliary coal mill, and at the moment, the high-yield main coal mill or the high-yield auxiliary coal mill inputs the materials to the second-stage gasification furnace and the first-stage gasification furnace at the same time, so that the yield of the first-stage gasification furnace is increased; and meanwhile, continuous feeding can be guaranteed when the coal mill is subjected to material detection, shutdown is avoided, the production efficiency is further improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water coal slurry gasification systems, and specifically relates to a water coal slurry gasification system. Background Technique

[0002] The water coal slurry gasification process is to transport the water coal slurry prepared by grinding coal and water in a mill to a gasification furnace to react with oxygen to generate water gas.

[0003] For example, the Chinese utility model patent with the application number 201920250758.9 discloses a low-energy-consumption water coal slurry gasification system. The raw coal passes through a coal storage hopper, a feeder, a coal mill, a coal mill discharge chute, a coal mill discharge pump and a gasification furnace in sequence to finally complete the water coal slurry gasification treatment.

[0004] However, in the actual production process, usually one coal mill is used as a standby. The cost of the entire production equipment is high. Therefore, after the equipment is put into use, the production equipment is basically not disassembled and assembled frequently, which will cause the output of water gas to remain basically unchanged; when the production demand increases, the standby coal mill will also be put into production. Since the material quality of the coal mill needs to be detected, the coal mill will be shut down, which will lead to a reduction in the feed of the gasification furnace, thus affecting the output and quality of water gas. Therefore, it cannot meet the actual production demand. Content of the Utility Model

[0005] The purpose of the utility model is to provide a water coal slurry gasification system to solve the technical problem that the current water gas cannot meet the production demand.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A water coal slurry gasification system includes a low-output water coal slurry gasification unit and a high-output water coal slurry gasification unit; the low-output water coal slurry gasification unit includes a first-stage gasification furnace, a low-output main coal mill and a low-output auxiliary coal mill, and both the low-output main coal mill and the low-output auxiliary coal mill are connected to the first-stage gasification furnace;

[0008] The high-output water coal slurry gasification unit includes a second-stage gasification furnace, a high-output main coal mill and a high-output auxiliary coal mill. Both the high-output main coal mill and the high-output auxiliary coal mill are connected to the second-stage gasification furnace, and the high-output main coal mill and the high-output auxiliary coal mill are also respectively connected to the first-stage gasification furnace.

[0009] Further defined, the discharge end of the low-output main coal mill is connected with a first-stage main feed pipeline, the discharge end of the low-output auxiliary coal mill is connected with a first-stage auxiliary feed pipeline, and both the first-stage main feed pipeline and the first-stage auxiliary feed pipeline are connected to the first-stage gasification furnace through a first-stage coal slurry tank pipeline;

[0010] Both the high-output main coal mill and the high-output auxiliary coal mill are connected to the first-stage gasifier through the first-stage coal slurry tank pipeline.

[0011] Further defined, a first-stage main feed valve is provided on the first-stage main feed pipeline, and a first-stage auxiliary feed valve is provided on the first-stage auxiliary feed pipeline.

[0012] Further defined, the number of the low-output auxiliary coal mills is two, and both of the two low-output auxiliary coal mills are connected to the first-stage coal slurry tank pipeline through the first-stage auxiliary feed pipeline.

[0013] Further defined, both the high-output main coal mill and the high-output auxiliary coal mill are connected to the first-stage coal slurry tank pipeline through a shared coal slurry tank pipeline, and a shared coal slurry valve is provided on the shared coal slurry tank pipeline.

[0014] Further defined, the discharge end of the high-output main coal mill is connected to a second-stage main feed pipeline, the discharge end of the high-output auxiliary coal mill is connected to a second-stage auxiliary feed pipeline, both the second-stage main feed pipeline and the second-stage auxiliary feed pipeline are connected to the second-stage gasifier through the second-stage coal slurry tank pipeline, the shared coal slurry tank pipeline is connected to the second-stage coal slurry tank pipeline, a second-stage main feed valve is provided on the second-stage main feed pipeline, and a second-stage auxiliary feed valve is provided on the second-stage auxiliary feed pipeline.

[0015] Further defined, the number of the high-output main coal mills is three, and all three high-output main coal mills are connected to the first-stage coal slurry tank pipeline through the second-stage main feed pipeline.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] In the present utility model, the high-output main coal mill and the high-output auxiliary coal mill are connected to the first-stage gasifier. When the output needs to be increased, the low-output main coal mill and the low-output auxiliary coal mill can continue to maintain one standby and one in use at the same time. At the same time, by increasing the load of the high-output main coal mill or the high-output auxiliary coal mill, the material output is increased. At this time, when the high-output main coal mill or the high-output auxiliary coal mill inputs materials to the second-stage gasifier, it also inputs materials to the first-stage gasifier, thereby increasing the output of the first-stage gasifier. At the same time, it can ensure continuous feeding during the material detection of the coal mill, avoid shutdown, further improve production efficiency, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 It is a schematic diagram of the feeding of the high-output main coal mill of the present utility model;

[0020] In the figure: 11 - first-stage gasifier; 12 - low-output main coal mill; 13 - low-output auxiliary coal mill; 21 - second-stage gasifier; 22 - high-output main coal mill; 23 - high-output auxiliary coal mill; 30 - first-stage coal slurry tank pipeline; 31 - first-stage main feeding pipeline; 32 - first-stage auxiliary feeding pipeline; 33 - first-stage main feeding valve; 34 - first-stage auxiliary feeding valve; 40 - second-stage coal slurry tank pipeline; 41 - second-stage main feeding pipeline; 42 - second-stage auxiliary feeding pipeline; 43 - second-stage main feeding valve; 44 - second-stage auxiliary feeding valve; 50 - shared coal slurry tank pipeline; 60 - shared coal slurry valve; 70 - coal slurry discharge tank; 80 - coal slurry discharge tank pump; 90 - coal slurry tank. Detailed implementation manners

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] In actual production, usually two separately operating water coal slurry gasification systems are put into operation, namely the first-stage water coal slurry gasification system and the second-stage water coal slurry gasification system respectively. The output of the first-stage water coal slurry gasification system (for example, 140,000 Nm 3 / h) is lower than that of the second-stage water coal slurry gasification system (for example, 210,000 Nm 3 / h). Correspondingly, the output of the coal mill in the first-stage water coal slurry gasification system (for example, 57.6 t / h) is lower than that of the coal mill in the second-stage water coal slurry gasification system (for example, 111.7 t / h). And in order to reserve room for capacity improvement in the later stage, the load of the coal mill in the second-stage water coal slurry gasification system is usually about 70% when working.

[0023] However, when temporarily increasing the output of water gas according to demand, if the transformation investment cost and economic cost of increasing the output of the second-stage water coal slurry gasification system production line are relatively high, usually the spare coal mills in the first-stage water coal slurry gasification system will be put into production at the same time. The cost is low and the benefit is high, which can meet the demand for temporarily increasing the output by less than 30%.

[0024] However, due to the production of the spare coal mills in the first-stage water coal slurry gasification system, each coal mill needs to stop when the material quality needs to be detected, which will lead to a reduction in output, and the rest of the feeding also needs to stop, affecting the work efficiency and increasing the cost at the same time; if the detection is not stopped, there will be unqualified material quality, which will ultimately lead to the non-compliance of the water gas quality, resulting in greater losses.

[0025] Based on this, according to the actual production requirements, the utility model provides a water coal slurry gasification system, which includes a low-output water coal slurry gasification unit and a high-output water coal slurry gasification unit.

[0026] Among them, referring to Figure 1 , the low-output water coal slurry gasification unit includes a first-stage gasifier 11, a low-output main coal mill 12, and a low-output auxiliary coal mill 13. Both the low-output main coal mill 12 and the low-output auxiliary coal mill 13 are connected to the first-stage gasifier 11. The low-output main coal mill 12 and the low-output auxiliary coal mill 13 are in a standby-one-use mode during actual production and can be switched to put into production to ensure the stable output of the first-stage gasifier 11.

[0027] The high-output water coal slurry gasification unit includes a second-stage gasifier 21, a high-output main coal mill 22, and a high-output auxiliary coal mill 23. Both the high-output main coal mill 22 and the high-output auxiliary coal mill 23 are connected to the second-stage gasifier 21. The high-output main coal mill 22 and the high-output auxiliary coal mill 23 are also respectively connected to the first-stage gasifier 11. The high-output main coal mill 22 and the high-output auxiliary coal mill 23 are in a standby-one-use mode during actual production and can be switched to put into production. At the same time, the high-output main coal mill 22 and the high-output auxiliary coal mill 23 can supply coal slurry to the first-stage gasifier 11, so that the output of syngas of the first-stage gasifier 11 is increased. At the same time, it is ensured that there is one coal mill as a standby in both the low-output water coal slurry gasification unit and the high-output water coal slurry gasification unit. When inspecting the working coal mill, the standby coal mill can be put into production to ensure that the coal slurry concentration meets the production requirements of the gasifier.

[0028] Further explanation, the discharge end of the low-output main coal mill 12 is connected with a first-stage main feeding pipeline 31, and the discharge end of the low-output auxiliary coal mill 13 is connected with a first-stage auxiliary feeding pipeline 32. Both the first-stage main feeding pipeline 31 and the first-stage auxiliary feeding pipeline 32 are connected to the first-stage gasifier 11 through a first-stage coal slurry tank pipeline 30.

[0029] In order to avoid the passage of materials when overhauling the first-stage coal slurry tank pipeline 30, the first-stage main feeding pipeline 31, and / or the first-stage auxiliary feeding pipeline 32, a first-stage main feeding valve 33 is selected to be installed on the first-stage main feeding pipeline 31 for valve control of the feeding of the low-output main coal mill 12; a first-stage auxiliary feeding valve 34 is installed on the first-stage auxiliary feeding pipeline 32 for valve control of the feeding of the low-output auxiliary coal mill 13.

[0030] In order to further increase the output of the low-output water coal slurry gasification unit during normal production, the number of the low-output auxiliary coal mills 13 can be selected as two or more. Two low-output auxiliary coal mills 13 are connected in parallel. During actual use, the two low-output auxiliary coal mills 13 can be put into production, and the low-output main coal mill 12 is used as a standby for inspection; or one low-output auxiliary coal mill 13 can be used as a standby for inspection, and the low-output main coal mill 12 and the other low-output auxiliary coal mill 13 are put into production.

[0031] Both of the two low-output auxiliary coal grinders 13 are connected to the first-stage coal slurry tank pipeline 30 through the first-stage auxiliary feeding pipeline 32.

[0032] At this time, in order to supply the materials prepared by the high-output main coal grinder 22 or the high-output auxiliary coal grinder 23 to the first-stage gasifier 11, it is selected that the discharge ends of the high-output main coal grinder 22 and the high-output auxiliary coal grinder 23 are both connected to the first-stage coal slurry tank pipeline 30 through the shared coal slurry tank pipeline 50. In order to avoid supplying the materials prepared by the high-output main coal grinder 22 or the high-output auxiliary coal grinder 23 to the first-stage gasifier 11 during normal production, it is selected that a shared coal slurry valve 60 is provided on the shared coal slurry tank pipeline 50 for manually controlling the on-off of the shared coal slurry tank pipeline 50.

[0033] For the high-output water coal slurry gasification unit, the discharge end of the high-output main coal grinder 22 is connected to the second-stage main feeding pipeline 41, and the discharge end of the high-output auxiliary coal grinder 23 is connected to the second-stage auxiliary feeding pipeline 42. Both the second-stage main feeding pipeline 41 and the second-stage auxiliary feeding pipeline 42 are connected to the second-stage gasifier 21 through the second-stage coal slurry tank pipeline 40. The shared coal slurry tank pipeline 50 is connected to the second-stage coal slurry tank pipeline 40. A second-stage main feeding valve 43 is provided on the second-stage main feeding pipeline 41, and a second-stage auxiliary feeding valve 44 is provided on the second-stage auxiliary feeding pipeline 42 to meet the production and maintenance requirements.

[0034] Among them, the number of the high-output auxiliary coal grinders 23 can be two or more, and the number of the high-output main coal grinders 22 can also be two or more. Taking one high-output auxiliary coal grinder 23 and three high-output main coal grinders 22 as an example for illustration, the three high-output main coal grinders 22 are in parallel.

[0035] In actual use, three high-output main coal grinders 22 can be put into production, and the high-output auxiliary coal grinder 23 is reserved for inspection; or one high-output main coal grinder 22 can be reserved for inspection, and the remaining two high-output main coal grinders 22 and another high-output auxiliary coal grinder 23 are put into production.

[0036] All three high-output main coal grinders 22 are connected to the second-stage coal slurry tank pipeline 40 through the second-stage main feeding pipeline 41.

[0037] Specifically, referring to Figure 2 , taking the high-output main coal grinder 22 as an example for illustration, the high-output main coal grinder 22 is successively connected to the coal slurry discharge tank 70, the coal slurry discharge tank pump 80, and the coal slurry tank 90. The shared coal slurry tank pipeline 50 is connected between the coal slurry discharge tank pump 80 and the coal slurry tank 90. The first-stage main feeding valve 33 is arranged between the coal slurry discharge tank 70 and the coal slurry discharge tank pump 80. By adjusting the rotation speed of the coal slurry discharge tank pump 80, the water coal slurry is supplied to the first-stage gasifier 11 and the second-stage gasifier 21 simultaneously.

[0038] Working process:

[0039] According to the production requirements, when it is temporarily necessary to increase the output of water gas, at this time, the raw materials input into the high-output main coal mill 22 and the high-output auxiliary coal mill 23 are increased, the loads of the high-output main coal mill 22 and the high-output auxiliary coal mill 23 are increased, and the output of water coal slurry is increased.

[0040] Subsequently, the common coal slurry valve 60 is opened, so that the water coal slurry prepared by the high-output water coal slurry gasification unit can supply materials to the first-stage gasifier 11 while normally supplying the second-stage gasifier 21, thereby increasing the output of water gas of the first-stage gasifier 11, meeting the actual production requirements, and avoiding the use of all coal mills in the low-output water coal slurry gasification unit.

[0041] When the production requirements return to normal, the common coal slurry valve 60 is closed, and the loads and raw material supply amounts of the high-output main coal mill 22 and the high-output auxiliary coal mill 23 are restored, with simple operation and low cost.

[0042] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that the terms used herein are only for describing specific embodiments, rather than intending to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-coal slurry gasification system, characterized in that: It includes a low-yield water-coal slurry gasification unit and a high-yield water-coal slurry gasification unit; The low-yield water-coal slurry gasification unit comprises a first-stage gasifier (11), a low-yield main coal mill (12) and a low-yield auxiliary coal mill (13), wherein the low-yield main coal mill (12) and the low-yield auxiliary coal mill (13) are both connected to the first-stage gasifier (11); The high-yield water-coal slurry gasification unit comprises a second-stage gasification furnace (21), a high-yield main coal mill (22) and a high-yield auxiliary coal mill (23); the high-yield main coal mill (22) and the high-yield auxiliary coal mill (23) are both connected to the second-stage gasification furnace (21); the high-yield main coal mill (22) and the high-yield auxiliary coal mill (23) are also respectively connected to the first-stage gasification furnace (11).

2. The water-coal slurry gasification system according to claim 1, characterized in that: The discharge end of the low-output main coal mill (12) is connected to a first-stage main feed pipeline (31), and the discharge end of the low-output auxiliary coal mill (13) is connected to a first-stage auxiliary feed pipeline (32). Both the first-stage main feed pipeline (31) and the first-stage auxiliary feed pipeline (32) are connected to the first-stage gasification furnace (11) through a first-stage coal slurry tank pipeline (30); The high-yield main coal mill (22) and the high-yield auxiliary coal mill (23) are both connected to the first-stage gasification furnace (11) through a first-stage coal slurry tank pipeline (30).

3. The water-coal slurry gasification system according to claim 2, characterized in that: The first-stage main material supply pipeline (31) is provided with a first-stage main material supply valve (33), and the first-stage auxiliary material supply pipeline (32) is provided with a first-stage auxiliary material supply valve (34).

4. The water-coal slurry gasification system according to claim 3, characterized in that: The number of the low-output auxiliary coal mills (13) is two, and the two low-output auxiliary coal mills (13) are both connected to the first-phase coal slurry tank pipeline (30) through the first-phase auxiliary feed pipeline (32).

5. The water-coal slurry gasification system according to any one of claims 2 to 4, characterized in that: The high-yield main coal mill (22) and the high-yield auxiliary coal mill (23) are both connected to the first-phase coal slurry tank pipeline (30) via a common coal slurry tank pipeline (50), and a common coal slurry valve (60) is provided on the common coal slurry tank pipeline (50).

6. The water-coal slurry gasification system according to claim 5, characterized in that: The discharge end of the high-yield main coal mill (22) is connected to a second-phase main feed pipeline (41), and the discharge end of the high-yield auxiliary coal mill (23) is connected to a second-phase auxiliary feed pipeline (42). Both the second-phase main feed pipeline (41) and the second-phase auxiliary feed pipeline (42) are connected to the second-phase gasifier (21) through a second-phase coal slurry tank pipeline (40). The common coal slurry tank pipeline (50) is connected to the second-phase coal slurry tank pipeline (40). The second-phase main feed pipeline (41) is provided with a second-phase main feed valve (43), and the second-phase auxiliary feed pipeline (42) is provided with a second-phase auxiliary feed valve (44).

7. The water-coal slurry gasification system according to claim 6, characterized in that: The number of the high-yield main coal mills (22) is three, and the three high-yield main coal mills (22) are all connected to the first-phase coal slurry tank pipeline (30) through the second-phase main feed pipeline (41).

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