CN215365615U - Back-blowing system for coal slurry pipeline - Google Patents
Back-blowing system for coal slurry pipeline Download PDFInfo
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- CN215365615U CN215365615U CN202120630505.1U CN202120630505U CN215365615U CN 215365615 U CN215365615 U CN 215365615U CN 202120630505 U CN202120630505 U CN 202120630505U CN 215365615 U CN215365615 U CN 215365615U
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Abstract
The utility model discloses a back flushing system for a coal slurry pipeline, which comprises a coal slurry pipeline (1) and is characterized in that: one end of a high-pressure nitrogen purging pipeline (9) is communicated with the nitrogen purging tank (13), and a nitrogen purging cut-off valve (10) is arranged on the pipeline at the other end; a secondary purging cut-off valve line (11) is also arranged between an inlet pipeline and an outlet pipeline of the nitrogen purging cut-off valve (10); and a throttle valve (12) for controlling the nitrogen amount in the back flushing process is arranged on the secondary line (11) of the purging cut-off valve. The utility model takes stable high-pressure nitrogen purging as a power gas source, adds a throttle valve and designs a purging program, thereby solving the problems of furnace temperature reduction, flash explosion and the like caused by advanced feeding of coal slurry, advanced escape of a large amount of inflammable volatiles and higher oxygen-carbon ratio of a system in the feeding process, realizing the control of the oxygen-carbon ratio in the feeding and combined feeding process of the gasification furnace, having the characteristics of good purging effect and low feeding cost and finally achieving the purpose of quickly recovering production.
Description
Technical Field
The utility model relates to the technical field of coal chemical industry or gasification with methanol as a production raw material, in particular to a coal slurry pipeline back-blowing system.
Background
China is a country with more coal and less oil, coal still serves as the energy resource mastery of China for a long time, the efficient and clean utilization of the coal has important strategic significance to China, and a coal utilization system taking coal gasification as the core is an important technology for comprehensively solving the energy problem of China. Among the coal gasification technologies, the coal water slurry gasification technology is the mainstream direction for the development of the coal gasification technology because of wide application range of coal types, high gasification temperature and pressure and easy large-scale production. According to the development trend of coal water slurry gasification and the industry operation effect in recent years, the stable operation of the gasification furnace and the success of starting and stopping the gasification furnace are key factors. However, long-term production observation shows that continuous feeding of the gasifier is a key operation for rapidly recovering production, and the control of the oxygen-carbon ratio in the continuous feeding process is the most important factor, which determines whether the feeding is successful and the process safety. Therefore, it is necessary to design a novel coal slurry pipeline sweeping process system with good control of the oxygen-carbon ratio of the coal slurry entering the furnace.
At present, in the process of continuous feeding of domestic commonly existing gasification furnaces, coal slurry between coal slurry feeding sequence control double valves cannot be discharged, the coal slurry is fed into the furnace in advance in the feeding process, a large amount of inflammable volatiles escape in advance, the oxygen-carbon ratio of a system is higher, and the problems of furnace temperature reduction, flash explosion and the like are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a coal slurry pipeline back-blowing system, which overcomes the defects in the prior art, and finally thoroughly eliminates the problem that the coal slurry cannot be discharged between the coal slurry feeding sequence control double valves by changing the blowing mode of the coal slurry pipeline, the coal slurry is fed into a furnace in advance in the feeding process, a large amount of combustible volatile matters escape in advance, the oxygen-carbon ratio of the system is higher, and the furnace temperature is reduced and flash explosion is caused, thereby achieving the purpose of quickly recovering the production.
The technical problem to be solved by the utility model is realized by the following technical scheme:
a coal slurry pipeline back flushing system comprises a coal slurry pipeline and a high-pressure nitrogen purging pipeline, wherein one end of the high-pressure nitrogen purging pipeline is communicated with a nitrogen purging tank, and a nitrogen purging cut-off valve is arranged on the pipeline at the other end of the high-pressure nitrogen purging pipeline; the high-pressure nitrogen purging pipeline is provided with a nitrogen purging cut-off valve; a secondary purging cut-off valve line is also arranged between the inlet pipeline and the outlet pipeline of the nitrogen purging cut-off valve; and a throttling hand valve is arranged on the secondary line of the purging cut-off valve. (ii) a The throttle valve has the function of controlling the nitrogen amount in the back flushing process.
Preferably, a pipeline in the inlet direction of the coal slurry upstream cut-off valve is connected with a pipeline going to a coal slurry tank; and a coal slurry backflow upstream cut-off valve and a coal slurry backflow downstream cut-off valve are sequentially arranged on the pipeline going to the coal slurry tank.
Preferably, a coal slurry upstream cut-off valve and a coal slurry downstream cut-off valve are sequentially arranged on the coal slurry pipeline; the coal slurry downstream cut-off valve is connected with a pipeline leading to the gasification furnace.
Preferably, a high-pressure coal slurry pump is arranged on the coal slurry pipeline.
Through the technical scheme, the utility model has the following beneficial effects:
the utility model takes stable high-pressure nitrogen purging as a power gas source, adds a throttle valve and designs a purging program, thereby solving the problems of furnace temperature reduction, flash explosion and the like caused by advanced feeding of coal slurry, advanced escape of a large amount of inflammable volatiles and high oxygen-carbon ratio of a system in the feeding process and realizing the control of the oxygen-carbon ratio in the feeding and combined feeding process of the gasification furnace; the process system has the characteristics of simple and convenient process operation, good purging effect and low investment cost, and finally achieves the aim of quickly recovering production.
Drawings
FIG. 1 is a schematic view of a back-flushing pipeline structure according to the present invention
FIG. 2 is a schematic view of the purging sequence control of the present invention
In the figure, 1-coal slurry pipeline, 2-high pressure coal slurry pump, 3-coal slurry upstream cut-off valve, 4-coal slurry downstream cut-off valve, 5-to gasification furnace pipeline, 6-to coal slurry tank pipeline, 7-coal slurry reflux upstream cut-off valve, 8-coal slurry reflux downstream cut-off valve, 9-high pressure nitrogen purging pipeline, 10-nitrogen purging cut-off valve, 11-purging cut-off valve secondary line, 12-throttle valve, 13-nitrogen purging tank
Detailed Description
A coal slurry pipeline blowback system as shown in fig. 1 provides a high-pressure nitrogen blowback process measure, comprising the following steps: a throttle valve 12 is added on a secondary blow-off valve line 11 of a nitrogen blow-off valve 10 of an original system coal slurry pipeline 1 and is used for controlling the nitrogen amount in the back-blowing process.
Specifically, the method comprises the following steps: one end of a high-pressure nitrogen purging pipeline 9 is communicated with a nitrogen purging tank 13, and a nitrogen purging cut-off valve 10 is arranged on the pipeline at the other end; a secondary purging cut-off valve line 11 is also arranged between an inlet pipeline and an outlet pipeline of the nitrogen purging cut-off valve 10; and a throttle valve 12 for controlling the nitrogen amount in the back flushing process is arranged on the secondary line 11 of the purging cut-off valve.
The purge sequence control principle shown in fig. 2 is as follows, including: starting a coal slurry back-blowing sequential control button by one key, sequentially opening a coal slurry pipeline 1 back-flow downstream cut-off valve 8, an upstream cut-off valve 7, a coal slurry pipeline upstream cut-off valve 3 and a downstream cut-off valve 4, closing an XV1306 and purging a throttle valve FV1306 by default opening degree of 10%; and setting an automatic stop chain according to the pressure (PT1313) reduction value of the nitrogen purging pipe 9, namely, automatically stopping nitrogen back blowing when the pressure (PT1313) is reduced by 0.2MPa, sequentially closing the purging throttle valve FV1306, the coal slurry pipeline upstream cut-off valve 3, the downstream cut-off valve 4, the coal slurry pipeline backflow upstream cut-off valve 7 and the downstream cut-off valve 8, setting a safety protection chain, namely, starting a back blowing program, wherein the pressure (PT1313) of the purging tank is unchanged within 3 seconds or the pressure (PT1309) of the coal slurry entering the gasification furnace is greater than 0.5MPa, and automatically stopping the purging program. Finally, the purpose of safe back flushing of the coal slurry pipeline is achieved.
The coal slurry pipeline (1) and the high-pressure nitrogen purging pipeline (9) are provided with two pressure transmitters PT1313 and PT1309 for detecting pressure change and process control in the purging process, and flow transmitters for detecting flow change in the purging process.
The coal slurry pipeline 1 is a single series of DN25 stainless steel pipes, and the connected sealing branch pipes are DN10 stainless steel pipes and are communicated with the nitrogen purging tank 13; the high-pressure nitrogen pressure (PT1313) is 12MPa, and the high-pressure nitrogen is anhydrous, oil-free and nitrogen without mechanical impurities; the throttle hand valve 12 is a DN25 stop valve and is welded with the high-pressure nitrogen purging pipeline 9; the auxiliary line 11 of the purging cut-off valve is DN251500Lb and is welded with the high-pressure nitrogen purging line 9;
the back flushing program is operated through a background of a DCS distributed control system;
and the back flushing program and the chain protection program are recorded in the background of the security system of the SIS instrument.
The embodiment has the following characteristics:
(1) only a throttling secondary line pipeline is added to the coal slurry pipeline purging cut-off valve, and other equipment is not required to be put into the valve, so that the purging effect is realized;
(2) the utility model can be used for a long time, is simple to operate and maintain and has no maintenance cost;
(3) the self-resources of the company are fully utilized, and the process operation is simple and convenient;
(4) and the safety risk in the continuous casting process is reduced.
Claims (4)
1. The utility model provides a coal slurry pipeline blowback system, includes coal slurry pipeline (1), characterized by: the device is characterized by also comprising a high-pressure nitrogen purging pipeline (9), wherein one end of the high-pressure nitrogen purging pipeline (9) is communicated with the nitrogen purging tank (13), and a nitrogen purging cut-off valve (10) is arranged on the pipeline at the other end; a secondary purging cut-off valve line (11) is also arranged between an inlet pipeline and an outlet pipeline of the nitrogen purging cut-off valve (10); and a throttle valve (12) for controlling the nitrogen amount in the back flushing process is arranged on the secondary line (11) of the purging cut-off valve.
2. The system of claim 1, wherein the system further comprises: a pipeline (6) going to a coal slurry tank is connected to a pipeline in the inlet direction of the coal slurry upstream cut-off valve (3); and a coal slurry backflow upstream cut-off valve (7) and a coal slurry backflow downstream cut-off valve (8) are sequentially arranged on the pipeline (6) leading to the coal slurry tank.
3. The system of claim 1 or 2, wherein: the coal slurry pipeline (1) is sequentially provided with a coal slurry upstream cut-off valve (3) and a coal slurry downstream cut-off valve (4); the coal slurry downstream cut-off valve (4) is connected with a pipeline (5) leading to the gasification furnace.
4. The system of claim 1, wherein the system further comprises: the coal slurry pipeline (1) is provided with a high-pressure coal slurry pump (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120630505.1U CN215365615U (en) | 2021-03-29 | 2021-03-29 | Back-blowing system for coal slurry pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120630505.1U CN215365615U (en) | 2021-03-29 | 2021-03-29 | Back-blowing system for coal slurry pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215365615U true CN215365615U (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120630505.1U Active CN215365615U (en) | 2021-03-29 | 2021-03-29 | Back-blowing system for coal slurry pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215365615U (en) |
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2021
- 2021-03-29 CN CN202120630505.1U patent/CN215365615U/en active Active
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