CN107641526B - Safety control method for nitrogen in acetylene production - Google Patents
Safety control method for nitrogen in acetylene production Download PDFInfo
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- CN107641526B CN107641526B CN201710834877.4A CN201710834877A CN107641526B CN 107641526 B CN107641526 B CN 107641526B CN 201710834877 A CN201710834877 A CN 201710834877A CN 107641526 B CN107641526 B CN 107641526B
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Abstract
The invention discloses a safety control method of nitrogen in acetylene production, which comprises the following steps of when DCS is normally controlledDCS controls the safe operation of nitrogen in the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator, the pressure of any equipment is more than or equal to 20KPa, all nitrogen automatic control valves are closed, the emptying automatic control valve is opened, when the pressure secondary remote transmission instrument fails, the flow rate of the entering nitrogen is taken as a main control parameter, and the nitrogen flow meter displays that the flow rate is more than or equal to 20m3And when the DCS is abnormal or the whole system is in a power failure state, the pressure of any equipment is more than or equal to 20KPa, all the nitrogen mechanical safety valves are automatically closed, the emptying mechanical safety valves are opened, and the nitrogen automatic control valve hardware interlocking control method of the small hopper A and the storage hopper B is added, so that the normal pressure in the system is ensured, the rupture of an explosion-proof membrane or the major safety accident of explosion in the whole facility caused by the situation that the UPS is completely powered off at the moment of power failure is solved, and the safety reliability is improved.
Description
Technical Field
The invention relates to a nitrogen control method in the technical field of acetylene production, in particular to a nitrogen safety control method in acetylene production.
Background
At present, the well-known acetylene production process technology is mature. The main process flow is as follows: acetylene is produced by a calcium carbide method. The crushed calcium carbide blocks with certain specifications enter a small hopper A, a storage hopper B and a storage hopper C of an acetylene generator through a bucket elevator and then enter a generator bin, the calcium carbide reacts with water to generate acetylene gas, and the acetylene gas enters the next production procedure through a certain process. The process is mainly controlled by a DCS distributed control system, wherein the DCS distributed control system is composed of hardware and software, and the hardware comprises a field control station, an operation station, an engineer station, a communication network cable and the like; the software comprises an operating system platform and DCS configuration software for industrial control, the adopted DCS hardware configuration and software configuration are different, and the safety control of the replacement and charging stages of the small hopper A, the storage hopper B and the storage hopper C in the processes of nitrogen charging and discharging of the acetylene generator is very important. The problems that exist at present are: when power is cut off instantly and the UPS is completely powered off at the moment, the control system can open all valves or be in an unknown state, a large amount of nitrogen can enter the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator, and the emptying valve is closed.
Disclosure of Invention
The invention aims to provide a safety control method which is beneficial to acetylene process operation, enhances safety control and is suitable for nitrogen in acetylene production.
A method for safely controlling nitrogen in acetylene production is characterized in that when DCS is normally controlled, the DCS controls the safe operation of nitrogen in a small hopper A, a storage hopper B, a storage hopper C and an acetylene generator, and the method mainly comprises the following steps: when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, closing all the nitrogen automatic control valves, and simultaneously immediately opening the emptying automatic control valves; when any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator fails in a secondary remote transmission instrument, the flow rate of the entering nitrogen is taken as a main control parameter, and the nitrogen flow meter displays that the flow rate is more than or equal to 20m3When the pressure exceeds the preset pressure, closing all the nitrogen automatic control valves, and simultaneously immediately opening the emptying automatic control valves;
when the DCS is abnormal or the whole system is in a power-off state, when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, all the nitrogen mechanical safety valves are automatically closed, and the emptying mechanical safety valves are opened; meanwhile, a hardware interlocking control method of nitrogen automatic control valves of the small hopper A and the storage hopper B is added, and the small hopper A and the storage hopper B cannot be opened simultaneously, so that the pressure in the system is normal.
When the DCS is normally controlled, the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, and when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is preferably more than or equal to 20KPa, closing the nitrogen automatic control valve A, the nitrogen automatic control valve B and the nitrogen automatic control valve D and simultaneously immediately opening the emptying automatic control valve;
according to the method for safely controlling nitrogen in acetylene production, when the DCS is normally controlled, the pressure secondary remote transmission instrument fails, and the nitrogen flow meter of any one of the small hopper A, the storage hopper B and the acetylene generator displays that the pressure is more than or equal to 20m3Closing the nitrogen automatic control valve A, the nitrogen automatic control valve B and the nitrogen automatic control valve D when the pressure is over/h, and simultaneously immediately opening the air release automatic control valve;
in the method for safely controlling nitrogen in acetylene production, when the DCS is abnormal or the whole system is in a power-off state, when the pressure of any one of the small hopper A, the hopper B, the hopper C and the acetylene generator is not less than 20KPa, the nitrogen mechanical safety valve A, B, D is automatically closed, and the emptying mechanical safety valve is opened, and when the pressure of any one of the small hopper A, the hopper B, the hopper C and the acetylene generator is not less than 20KPa, the nitrogen mechanical safety valve A, B, D is automatically closed, and the emptying mechanical safety valve is opened.
Because the potential safety hazard of nitrogen in acetylene production is analyzed layer by layer, and the safety control method is added, the problem that a large amount of nitrogen enters the system because all valves are closed or in an unknown state by the control system when the UPS is completely powered off at the moment of power failure is solved, and the explosion-proof membrane is prevented from being broken or major safety accidents of explosion in the whole facility caused by the fact that the hopper and the storage hopper or the storage hopper and the acetylene generator are communicated with the outside are avoided, and the safety and reliability are improved.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic diagram of a nitrogen-related process flow for acetylene production according to example 1 of the present invention.
In fig. 1, 1 is a feeding conveyor; 2 is a small hopper A device; 3, an emptying device; 4 is a storage hopper B device; 5 is a storage hopper C device; 6 is an acetylene generator device; 21 is a small hopper A nitrogen inlet pipe, and 22 is a pressure secondary remote transmission instrument A; 23 is a nitrogen flowmeter A; 24 is a nitrogen automatic control valve A; 25 is a nitrogen mechanical safety valve A; 31 is a pressure secondary remote transmission instrument E; 32 is a mechanical safety valve for emptying; 33 is an emptying automatic control valve; 41 is a nitrogen inlet pipe of a storage hopper B, and 42 is a pressure secondary remote transmission instrument B; 43 is nitrogen flowmeter B; 44 is a nitrogen self-control valve B; 45 is a nitrogen mechanical safety valve B; 51 is a storage hopper C pressure secondary remote transmission instrument C; 61 is an acetylene generator nitrogen inlet pipe, and 62 is a pressure secondary remote transmission instrument D; 63 is a nitrogen gas flowmeter D; 64 is a nitrogen automatic control valve D; and 65 is a nitrogen mechanical safety valve D.
Detailed Description
Referring to the attached figure 1, the embodiment 1 of the invention is a method for safely controlling nitrogen in acetylene production, when DCS is normally controlled, the DCS controls the safe operation of nitrogen in a small hopper A1, a storage hopper B4, a storage hopper C5 and an acetylene generator 6, and the method mainly comprises the following steps: when the pressure of any one of the small hopper A1, the storage hopper B4, the storage hopper C5 and the acetylene generator 6 is more than or equal to 20KPa, closing all the nitrogen automatic control valves 24, 44 and 64 and simultaneously immediately opening the emptying automatic control valve 33; when any one of the small hopper A1, the storage hopper B4, the storage hopper C5 and the acetylene generator 6 has a fault in the secondary pressure remote transmission instrument 22, 42, 51 and 62, the nitrogen flow meter 23, 43 and 63 displays that the flow rate of the entering nitrogen is more than or equal to 20m3At the time of/h, closing all the nitrogen automatic control valves 24, 44 and 64, and simultaneously immediately opening the emptying automatic control valve 33;
when the DCS is abnormal or the whole system is in a power-off state, when the pressure of any one of the small hopper A1, the hopper B4, the hopper C5 and the acetylene generator 6 is more than or equal to 20KPa, automatically closing all the nitrogen mechanical safety valves 25, 45 and 65, and opening the emptying mechanical safety valve 32; meanwhile, the hardware interlocking control method of the nitrogen automatic control valves 24 and 44 of the small hopper A1 and the storage hopper B4 is added, and the small hopper A1 and the storage hopper B4 cannot be opened at the same time so as to ensure that the pressure in the system is normal.
When the DCS is normally controlled, the pressure of any one of the small hopper A1, the storage hopper B4, the storage hopper C5 and the acetylene generator 6 is more than or equal to 20KPa, and when the pressure of any one of the small hopper A1, the storage hopper B4, the storage hopper C5 and the acetylene generator 6 is preferably more than or equal to 20KPa, all the nitrogen automatic control valves 24, 44 and 64 are closed, and the emptying automatic control valve 33 is opened immediately;
a second one as described aboveThe nitrogen safety control method in alkyne production is characterized by that when the above-mentioned DCS is normally controlled, the nitrogen flowmeters 23, 43 and 63 of any equipment of small hopper A1, storage hopper B4 and acetylene generator 6 can display its nitrogen flow rate greater than or equal to 20m3At the time of/h, closing all the nitrogen automatic control valves 24, 44 and 64, and simultaneously immediately opening the emptying automatic control valve 33;
in the method for safely controlling nitrogen in acetylene production, when the DCS is abnormal or the whole system is in a power-off state, when the pressure of any one of the small hopper A1, the storage hopper B4, the storage hopper C5 and the acetylene generator 6 is more than or equal to 20KPa, all the nitrogen mechanical safety valves 25, 45 and 65 are automatically closed, and the emptying mechanical safety valve 32 is opened, and when the pressure of any one of the equipment is more than or equal to 20KPa, all the nitrogen mechanical safety valves 25, 45 and 65 are automatically closed, and the emptying mechanical safety valve 32 is opened.
The invention mainly increases the safe operation of the mechanical safety valve, and simultaneously increases the control method of the DCS control nitrogen automatic control valve and the emptying automatic control valve, and the rest is the same as the prior art.
Claims (4)
1. A safety control method of nitrogen in acetylene production is characterized in that: when the DCS is normally controlled, the DCS controls the safe operation of the small hopper A, the storage hopper B, the storage hopper C and the nitrogen in the acetylene generator, and the method mainly comprises the following steps: when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, closing all the nitrogen automatic control valves, and simultaneously immediately opening the emptying automatic control valves; when any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator fails in a secondary remote transmission instrument, the flow rate of the entering nitrogen is taken as a main control parameter, and the nitrogen flow meter displays that the flow rate is more than or equal to 20m3When the pressure exceeds the preset pressure, closing all the nitrogen automatic control valves, and simultaneously immediately opening the emptying automatic control valves; when the DCS is abnormal or the whole system is in a power-off state, when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, all the nitrogen mechanical safety valves are automatically closed, and the emptying mechanical safety valves are opened; meanwhile, a hardware interlocking control method of nitrogen automatic control valves of the small hopper A and the storage hopper B is added, and the small hopper A and the storage hopper B cannot be opened simultaneously, so that the pressure in the system is normal.
2. The safety control method of nitrogen gas in acetylene production according to claim 1, characterized in that: when the DCS is normally controlled, the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, and when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, closing the nitrogen automatic control valve A, the nitrogen automatic control valve B and the nitrogen automatic control valve D and simultaneously immediately opening the emptying automatic control valve.
3. The safety control method of nitrogen gas in acetylene production according to claim 1, characterized in that: when the DCS is normally controlled, the pressure secondary remote transmission instrument fails, and the nitrogen flowmeter of any equipment of the small hopper A, the storage hopper B and the acetylene generator displays that the pressure is more than or equal to 20m3And when the pressure exceeds the preset pressure, closing the nitrogen automatic control valve A, the nitrogen automatic control valve B and the nitrogen automatic control valve D, and simultaneously immediately opening the air-release automatic control valve.
4. The safety control method of nitrogen gas in acetylene production according to claim 1, characterized in that: when the DCS is abnormal or the whole system is in a power-off state, when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is more than or equal to 20KPa, the nitrogen mechanical safety valve A, B, D is automatically closed, and the emptying mechanical safety valve is opened, and when the pressure of any one of the small hopper A, the storage hopper B, the storage hopper C and the acetylene generator is normally controlled by the DCS is more than or equal to 20KPa, the nitrogen mechanical safety valve A, B, D is automatically closed, and the emptying mechanical safety valve is opened.
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| CN201710834877.4A CN107641526B (en) | 2017-09-15 | 2017-09-15 | Safety control method for nitrogen in acetylene production |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642528A (en) * | 2013-12-11 | 2014-03-19 | 甘肃银光聚银化工有限公司 | Calcium carbide preparing and feeding automatic control system of acetylene generator |
| CN204779493U (en) * | 2015-05-26 | 2015-11-18 | 广西德陆科技有限公司 | Full automatic material conveying system of acetylene gas generator |
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- 2017-09-15 CN CN201710834877.4A patent/CN107641526B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642528A (en) * | 2013-12-11 | 2014-03-19 | 甘肃银光聚银化工有限公司 | Calcium carbide preparing and feeding automatic control system of acetylene generator |
| CN204779493U (en) * | 2015-05-26 | 2015-11-18 | 广西德陆科技有限公司 | Full automatic material conveying system of acetylene gas generator |
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Address after: North Road 832000 the Xinjiang Uygur Autonomous Region Shihezi Development Zone No. 36 Applicant after: Shihezi Tianyu new solid chemical Co. Ltd. Applicant after: Xinjiang Tianye (Group) Co., Ltd. Address before: North Road 832000 the Xinjiang Uygur Autonomous Region Shihezi Development Zone No. 36 Applicant before: SHIHEZI DEVELOPMENT ZONE TIANYE CHEMICAL CO., LTD. Applicant before: Xinjiang Tianye (Group) Co., Ltd. |
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