A new gasification system coal slurry tank reverse cut control system

Abstract

The utility model discloses a novel gasification system coal slurry tank inverted cut control system, including coal slurry tank A, coal slurry tank B, be connected with coal slurry pipeline B and coal slurry pipeline D on coal slurry tank A, be connected with coal slurry pipeline A and coal slurry pipeline C on coal slurry tank B, high pressure coal slurry pump C and high pressure coal slurry pump D are provided respectively on coal slurry pipeline C with coal slurry pipeline D, the other end of coal slurry pipeline B is connected on coal slurry pipeline C, and the connecting point is located in the upstream of high pressure coal slurry pump C along the internal liquid flow direction of coal slurry pipeline C, the other end of coal slurry pipeline A is connected on coal slurry pipeline D, and the connecting point is located in the upstream of high pressure coal slurry pump D along the internal liquid flow direction of coal slurry pipeline D. Advantages are: by the series connection of coal slurry tank A / B can on -line switching operation, help gasification system safe and stable operation, effectively reduce gasification system opening and parking risk and realize the cost reduction and benefit increase.

Description

Technical Field

[0001] This utility model relates to the field of coal slurry tank switching technology in coal-to-methanol gasification systems, and in particular to a novel coal slurry tank switching control system for gasification systems. Background Technology

[0002] A chemical company has a methanol plant with an annual production capacity of 900,000 tons. The plant uses coal as raw material and clean coal technology as its core. It adopts domestically patented coal chemical technology with independent intellectual property rights (the core device is a four-nozzle opposed coal-water slurry pressurized gasifier) ​​to achieve energy conservation, emission reduction and clean production.

[0003] The gasification system uses coal as raw material. After coal grinding and slurry preparation (with the addition of additives), the coal slurry is pumped into the gasifier and reacted with high-pressure oxygen to produce methanol feed gas. During normal operation, coal slurry tanks A and B correspond to gasification systems A and B respectively. If the coal slurry tank agitator malfunctions or the raw coal slurry stratifies and adheres to the wall, one coal slurry tank needs to be shut down urgently. At this time, the corresponding gasification system will also be shut down, causing significant production losses. Utility Model Content

[0004] The purpose of this invention is to provide a novel coal slurry trough reverse cutting control system for a gasification system, thereby solving the aforementioned problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel gasification system coal slurry tank reverse-cutting control system includes a coal slurry tank A and a coal slurry tank B; coal slurry tank A is connected to coal slurry pipeline B and coal slurry pipeline D, and coal slurry tank B is connected to coal slurry pipeline A and coal slurry pipeline C; high-pressure coal slurry pump C and high-pressure coal slurry pump D are respectively installed on coal slurry pipeline C and coal slurry pipeline D; the other end of coal slurry pipeline B is connected to coal slurry pipeline C, and the connection point is located upstream of high-pressure coal slurry pump C along the internal liquid flow direction of coal slurry pipeline C; the other end of coal slurry pipeline A is connected to coal slurry pipeline D, and the connection point is located upstream of high-pressure coal slurry pump D along the internal liquid flow direction of coal slurry pipeline D.

[0007] Preferably, the coal slurry pipeline B is provided with a plunger valve F0, a first drain pipe, a second drain pipe and a ball valve F3 at intervals along the internal liquid flow direction. The first drain pipe and the second drain pipe are respectively provided with ball valve F1 and ball valve F2. The other end of the first drain pipe and the second drain pipe are respectively provided with quick interface T1 and quick interface T2.

[0008] Preferably, a plunger valve F7, a fourth drain pipe, a third drain pipe, and a ball valve F4 are sequentially and spaced apart along the internal liquid flow direction on the coal slurry pipeline C. Ball valves F6 and F5 are respectively installed on the fourth and third drain pipes. Quick connectors T4 and T3 are respectively installed at the other end of the fourth and third drain pipes. The connection point between the coal slurry pipeline B and the coal slurry pipeline C is located between the ball valve F4 and the high-pressure coal slurry pump C.

[0009] Preferably, the coal slurry pipeline A is provided with a plunger valve F10, a fifth drain pipe, a sixth drain pipe and a ball valve F13 at intervals along the internal liquid flow direction. The fifth drain pipe and the sixth drain pipe are respectively provided with ball valves F11 and F12. The other end of the fifth drain pipe and the sixth drain pipe are respectively provided with quick interface T5 and quick interface T6.

[0010] Preferably, the coal slurry pipeline D is provided with a plunger valve F17, an eighth drain pipe, a seventh drain pipe, and a ball valve F14 at intervals along the internal liquid flow direction. The eighth and seventh drain pipes are respectively provided with ball valves F16 and F15. The other ends of the eighth and seventh drain pipes are respectively provided with quick-connect interfaces T8 and T7. The connection point between the coal slurry pipeline A and the coal slurry pipeline D is located between the ball valve F14 and the high-pressure coal slurry pump D.

[0011] The beneficial effects of this utility model are: 1. By connecting coal slurry tanks A and B in series, online switching operation is possible, which helps the gasification system operate safely and stably, effectively reducing the risk of start-up and shutdown of the gasification system and achieving cost reduction and efficiency improvement. 2. In case of abnormal situations, it can protect the stability of the coal slurry conveying system and avoid damage to important equipment such as high-pressure coal slurry pumps. 3. It can reduce fluctuations in the production system, avoid emergency shutdown of the gasification system, and reduce economic losses. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the coal slurry trough reverse cutting control system in an embodiment of this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0014] like Figure 1As shown in this embodiment, a novel coal slurry tank reverse-cutting control system for a gasification system is provided, including a coal slurry tank A and a coal slurry tank B; coal slurry tank A is connected to coal slurry pipeline B and coal slurry pipeline D, and coal slurry tank B is connected to coal slurry pipeline A and coal slurry pipeline C; high-pressure coal slurry pump C and high-pressure coal slurry pump D are respectively installed on coal slurry pipeline C and coal slurry pipeline D; the other end of coal slurry pipeline B is connected to coal slurry pipeline C, and the connection point is located upstream of high-pressure coal slurry pump C along the internal liquid flow direction of coal slurry pipeline C; the other end of coal slurry pipeline A is connected to coal slurry pipeline D, and the connection point is located upstream of high-pressure coal slurry pump D along the internal liquid flow direction of coal slurry pipeline D.

[0015] In this embodiment, a plunger valve F0, a first drain pipe, a second drain pipe, and a ball valve F3 are sequentially and spaced apart along the internal liquid flow direction on the coal slurry pipeline B. Ball valves F1 and F2 are respectively installed on the first drain pipe and the second drain pipe. Quick interface T1 and quick interface T2 are respectively installed at the other end of the first drain pipe and the second drain pipe.

[0016] Along the internal liquid flow direction, the coal slurry pipeline C is sequentially and spaced apart by a plunger valve F7, a fourth drain pipe, a third drain pipe, and a ball valve F4. The fourth and third drain pipes are respectively equipped with ball valves F6 and F5. The other ends of the fourth and third drain pipes are respectively equipped with quick-connect interfaces T4 and T3. The connection point between the coal slurry pipeline B and the coal slurry pipeline C is located between the ball valve F4 and the high-pressure coal slurry pump C.

[0017] In this embodiment, a plunger valve F10, a fifth drain pipe, a sixth drain pipe, and a ball valve F13 are sequentially and spaced apart along the internal liquid flow direction on the coal slurry pipeline A. Ball valves F11 and F12 are respectively installed on the fifth and sixth drain pipes. Quick connectors T5 and T6 are respectively installed at the other end of the fifth and sixth drain pipes.

[0018] The coal slurry pipeline D is sequentially and spaced along the internal liquid flow direction by a plunger valve F17, an eighth drain pipe, a seventh drain pipe, and a ball valve F14. The eighth and seventh drain pipes are respectively equipped with ball valves F16 and F15. The other ends of the eighth and seventh drain pipes are respectively equipped with quick-connect interfaces T8 and T7. The connection point between the coal slurry pipeline A and the coal slurry pipeline D is located between the ball valve F14 and the high-pressure coal slurry pump D.

[0019] After the gasification system's coal slurry tank switching control system is built and put into use, taking the switch from coal slurry tank B to coal slurry tank A during maintenance as an example, the specific working process is as follows:

[0020] 1. Flush the pipeline from coal slurry tank A to the inlet ball valve F3 of high-pressure coal slurry pump C with water in advance to ensure the smooth flow of coal slurry. Specifically, open ball valve F2 of the pipeline from coal slurry tank A to high-pressure coal slurry pump C, connect flushing water through quick interface T1, open ball valves F1 and F2, and flush the pipeline from coal slurry tank A to the inlet ball valve F3 of high-pressure coal slurry pump C with fresh water on site. After flushing, close the flushing water, open the plunger valve F0 at the bottom of coal slurry tank A until a large amount of coal slurry flows out at quick interface T2, then close ball valve F2 and plunger valve F0.

[0021] 2. Open the first flushing water ball valve F2 (1 / 3 position) after the plunger valve F0 at the bottom of coal slurry tank A. Then, slowly open the ball valve F3 from coal slurry tank A to the inlet of high-pressure coal slurry pump C. During this process, observe whether coal slurry flows out of the quick-connect interface T2. At the same time, assign a person to control the coal slurry flow at the flushing water ball valve F2 to avoid a decrease in the inlet pressure of high-pressure coal slurry pump C (P1103C) due to excessive flow. After the coal slurry flows out of T2 continuously and stably, close the ball valve F2. Then, fully open the ball valve F3 at the inlet of high-pressure coal slurry pump C.

[0022] 3. Fully open the plunger valve F0 from coal slurry tank A to the inlet of high-pressure coal slurry pump C, and run it stably for 15 minutes. Then gradually close the plunger valve F7 from coal slurry tank B to the inlet of high-pressure coal slurry pump C. When it is closed to 1 / 2 position, observe for 5 minutes. If there is no change in the inlet pressure and coal slurry flow rate of high-pressure coal slurry pump C (P1103C), continue to close the inlet plunger valve F7. When it is closed to 1 / 3 position, observe for 5 minutes. If there is no change in the inlet pressure and coal slurry flow rate of high-pressure coal slurry pump C (P1103C), continue to close the inlet plunger valve F7. When it is closed to 1 / 4 position, observe for 5 minutes. If there is no change in the inlet pressure and coal slurry flow rate of high-pressure coal slurry pump C (P1103C), continue to close the inlet plunger valve F7 until it is completely closed. During the closure of the plunger valve F7, pay attention to the inlet pressure of high-pressure coal slurry pump C (P1103C). If the inlet pressure drops, immediately fully open the plunger valve F7.

[0023] 4. When the plunger valve F7 at the inlet of the coal slurry tank B to the high-pressure coal slurry pump C (P1103C) is almost completely closed, ensure that the liquid level in the coal slurry tanks A and B is stable.

[0024] 5. Observe the operation for 5 minutes. If there is no change in the inlet pressure and flow rate of the high-pressure coal slurry pump C (P1103C), close the ball valve F4 from the coal slurry tank B to the inlet of the high-pressure coal slurry pump C.

[0025] 6. Open the quick-connect interface T3 from coal slurry tank B to the inlet of high-pressure coal slurry pump C. Connect flushing water through quick-connect interface T4. Open ball valves F5 and F6. The flushing water will clean the pipeline between coal slurry tank B and ball valve F4 at the inlet of high-pressure coal slurry pump C. If quick-connect interface T3 is found to be blocked after connecting flushing water, immediately close ball valve F6, disconnect the flushing water hose, disassemble and inspect ball valve F5, clear the drain blockage, and flush to prevent flushing water from entering the inlet of high-pressure coal slurry pump C.

[0026] 7. After confirming that the high-pressure coal slurry pump C is running stably without any abnormalities, switch the coal slurry tank B from maintenance to operation of coal slurry tank A.

[0027] The process of switching from coal slurry tank A to coal slurry tank B during maintenance is the same as the above process (achieved by operating the corresponding valves and interfaces on coal slurry pipelines A and D).

[0028] After realizing online switching of coal slurry tank A / B, it can effectively deal with abnormal situations, protect the stability of coal slurry supply, avoid frequent start-up and shutdown of gasification system, and reduce economic losses from system adjustment.

[0029] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0030] This invention provides a novel coal slurry tank switching control system for a gasification system. By connecting coal slurry tanks A and B in series, online switching operation is possible, which helps ensure the safe and stable operation of the gasification system, effectively reducing the risk of system start-up and shutdown, and achieving cost reduction and efficiency improvement. In case of abnormalities, it can protect the stability of the coal slurry conveying system and prevent damage to important equipment such as high-pressure coal slurry pumps. It can reduce production system fluctuations, avoid emergency shutdowns of the gasification system, and reduce economic losses.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A novel coal slurry tank reversing control system for a gasification system, characterized in that: The system includes a coal slurry tank A and a coal slurry tank B; coal slurry tank A is connected to coal slurry pipeline B and coal slurry pipeline D, and coal slurry tank B is connected to coal slurry pipeline A and coal slurry pipeline C; high-pressure coal slurry pump C and high-pressure coal slurry pump D are respectively installed on coal slurry pipeline C and coal slurry pipeline D; the other end of coal slurry pipeline B is connected to coal slurry pipeline C, and the connection point is located upstream of high-pressure coal slurry pump C along the internal liquid flow direction of coal slurry pipeline C; the other end of coal slurry pipeline A is connected to coal slurry pipeline D, and the connection point is located upstream of high-pressure coal slurry pump D along the internal liquid flow direction of coal slurry pipeline D.

2. The novel gasification system coal slurry tank reverse cutting control system according to claim 1, characterized in that: The coal slurry pipeline B is provided with a plunger valve F0, a first drain pipe, a second drain pipe and a ball valve F3 at intervals along the internal liquid flow direction. The first drain pipe and the second drain pipe are respectively provided with ball valve F1 and ball valve F2. The other end of the first drain pipe and the second drain pipe are respectively provided with quick interface T1 and quick interface T2.

3. The novel gasification system coal slurry tank reverse cutting control system according to claim 2, characterized in that: Along the internal liquid flow direction, the coal slurry pipeline C is sequentially and spaced apart by a plunger valve F7, a fourth drain pipe, a third drain pipe, and a ball valve F4. The fourth and third drain pipes are respectively equipped with ball valves F6 and F5. The other ends of the fourth and third drain pipes are respectively equipped with quick-connect interfaces T4 and T3. The connection point between the coal slurry pipeline B and the coal slurry pipeline C is located between the ball valve F4 and the high-pressure coal slurry pump C.

4. The novel gasification system coal slurry tank reverse cutting control system according to claim 3, characterized in that: Along the internal liquid flow direction, the coal slurry pipeline A is sequentially and intermittently equipped with a plunger valve F10, a fifth drain pipe, a sixth drain pipe, and a ball valve F13. The fifth drain pipe and the sixth drain pipe are respectively equipped with ball valves F11 and F12. The other end of the fifth drain pipe and the sixth drain pipe are respectively equipped with quick-connect interface T5 and quick-connect interface T6.

5. The novel gasification system coal slurry tank reverse cutting control system according to claim 4, characterized in that: The coal slurry pipeline D is sequentially and spaced along the internal liquid flow direction by a plunger valve F17, an eighth drain pipe, a seventh drain pipe, and a ball valve F14. The eighth and seventh drain pipes are respectively equipped with ball valves F16 and F15. The other ends of the eighth and seventh drain pipes are respectively equipped with quick-connect interfaces T8 and T7. The connection point between the coal slurry pipeline A and the coal slurry pipeline D is located between the ball valve F14 and the high-pressure coal slurry pump D.

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