CN218672119U - Interlocking protection system between air separation device and boiler device - Google Patents
Interlocking protection system between air separation device and boiler device Download PDFInfo
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- CN218672119U CN218672119U CN202121940491.XU CN202121940491U CN218672119U CN 218672119 U CN218672119 U CN 218672119U CN 202121940491 U CN202121940491 U CN 202121940491U CN 218672119 U CN218672119 U CN 218672119U
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Abstract
The utility model relates to an interlocking protection system between an air separation device and a boiler device, which comprises a boiler device DCS subsystem, wherein the boiler device DCS subsystem comprises a boiler device DCS controller, and the boiler device DCS controller is connected with various transmitters and sensors on the site of the boiler device; the boiler device DCS controller is connected with the boiler MFT; the air separation plant DCS subsystem comprises an air separation plant DCS controller, and the air separation plant DCS controller is connected with the boiler MFT and used for judging whether the air separation air compressor is jumped due to boiler failure; the air separation plant DCS controller is connected with the boiler plant DCS controller; the steam pipe network device DCS subsystem comprises a steam pipe network DCS controller, and the steam pipe network DCS controller is connected with the air separation device DCS controller; the steam pipe network DCS controller is connected with the emptying valve; the utility model provides an interlocking protection system between air separation plant and boiler plant, complicated interlocking coupling defect between fine solution coal chemical industry enterprise boiler, empty, the steam pipe network.
Description
Technical Field
The utility model relates to a coal chemical industry technical field, in particular to interlock protection system between air separation plant and boiler plant.
Background
Boiler plant, air separation plant are as common public engineering device of coal chemical industry enterprise, are used for providing the public materials such as steam, oxygen, nitrogen gas for subsequent workshop section usually, occupy its important position in whole factory. The abnormity of the boiler and the air separation unit can cause the fluctuation of each unit of the whole plant and even the large-area stop accident. At present, air separation air compressors of core equipment of most air separation plants use steam generated by a boiler as power, so that the coupling relation between the boiler and the air separation is increased.
In the prior art, the steam pressure interlocking protection systems among the boiler, the air separation system and the steam pipe network are independent from each other, and the content can be briefly described as follows: 1. if the single boiler is abnormally shut down, an air separation air compressor is stopped in an interlocking manner; 2. if the air separation air compressor is abnormally stopped, the boiler is stopped in an interlocking way; 3. and the steam pipe network vent valve is interlocked and opened when the single air separation air compressor is abnormally stopped. However, in the actual operation process, the three conditions are coupled, and the problems that the steam pipe network cannot keep balance and the pressure of the pipe network is reduced instantly occur. The other air separation air compressors are abnormally stopped due to low pressure of a pipe network, and the remaining boiler is interlocked and stopped after the air separation air compressors are stopped. Finally, chain reaction is caused, the supply of steam, oxygen and nitrogen is insufficient, and the whole boiler, the air separation plant and the subsequent workshop section devices are dragged down, so that huge economic loss is caused to enterprises. Meanwhile, the risk of overpressure exists after the steam balance is damaged, and potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the problem that exists among the above-mentioned prior art, provide an interlocking protection system between air separation plant and boiler plant.
The technical scheme of the utility model is that:
an interlock protection system between an air separation plant and a boiler plant, comprising:
the boiler device DCS subsystem comprises a boiler device DCS controller, and the boiler device DCS controller is connected with various transmitters and sensors on the site of the boiler device; the boiler device DCS controller is connected with the boiler MFT;
the air separation plant DCS subsystem comprises an air separation plant DCS controller, and the air separation plant DCS controller is connected with the boiler MFT and used for judging whether the air separation air compressor is jumped due to boiler failure; the air separation plant DCS controller is connected with the boiler plant DCS controller and used for sending an air separation air compressor operation signal;
the steam pipe network device DCS subsystem comprises a steam pipe network DCS controller, and the steam pipe network DCS controller is connected with the air separation device DCS controller; and the steam pipe network DCS controller is connected with the emptying valve.
The boiler device DCS controller receives various trigger signals of a boiler device site through an AI analog input card and a DI digital input card; the boiler device DCS controller receives an air separation air compressor running signal output by the air separation device DCS controller through the DO digital output card through the DI digital input card; the boiler device DCS controller is connected with the boiler MFT through a DO digital output clamping piece, and the boiler MFT is connected with the air separation device DCS controller through a DI digital input clamping piece.
The DCS controller of the air separation device is connected with the steam pipe network DCS controller through a DI digital value input clamping piece.
The steam pipe network DCS controller is connected with the emptying valve through a DO digital quantity output clamping piece.
The boiler device DCS controller receives a trigger signal that two MFT emergency stop buttons of an auxiliary console of a boiler device field are pressed down, a trigger signal that a fire detection cooling air main pipe pressure switch gives a low alarm, a trigger signal that a fire detection cooling fan operation signal disappears, a boiler total air quantity low alarm, a trigger signal that a delay is 30s, a trigger signal that a steam drum water level high alarm, a trigger signal that a steam drum water level low alarm, a trigger signal that a hearth negative pressure high alarm, a trigger signal that a hearth negative pressure low alarm, a trigger signal that an air feeder operation signal disappears, a trigger signal that an induced draft fan operation signal disappears, a trigger signal that a fire detection signal disappears and a trigger signal that an air separation air compressor operation signal disappears through an AI analog quantity input clamping piece and a DI digital quantity input clamping piece.
Compared with the prior art, the utility model provides a pair of interlocking protection system between air separation plant and boiler plant, its beneficial effect is:
the utility model provides an interlocking protection system between air separation plant and boiler plant modifies original design interlocking content, and the boiler blowing out leads to the air separation air compressor machine to shut down the back after modifying, can not further make steam pipe network atmospheric valve open again, and steam pipe network balance can keep, and all the other devices can steady operation, avoid the enlarged scale of trouble.
Drawings
Fig. 1 is a schematic block diagram of the system of the present invention.
Detailed Description
An embodiment of the present invention will be described in detail with reference to fig. 1, but it should be understood that the scope of the present invention is not limited by the embodiment.
Example 1:
as shown in fig. 1, the utility model provides an interlocking protection system between air separation plant and boiler plant, including boiler plant DCS subsystem, air separation plant DCS subsystem and steam pipe network plant DCS subsystem; the boiler device DCS subsystem comprises a boiler device DCS controller, and the boiler device DCS controller is connected with various transmitters and sensors on the site of the boiler device; the boiler device DCS controller is connected with the boiler MFT; the air separation plant DCS subsystem comprises an air separation plant DCS controller, and the air separation plant DCS controller is connected with the boiler MFT and used for judging whether the air separation air compressor is jumped due to boiler failure; the air separation plant DCS controller is connected with the boiler plant DCS controller and used for sending an air separation air compressor operation signal; the steam pipe network device DCS subsystem comprises a steam pipe network DCS controller, and the steam pipe network DCS controller is connected with the air separation device DCS controller; and the steam pipe network DCS controller is connected with the emptying valve.
The utility model discloses well MFT generally refers to the automatic safeguard measure to equipment in the middle of the boiler operation, when taking place unusual accident or report to the police, or the automatic shutdown equipment operation. When the equipment needs to be started after the defect or the fault is eliminated, the MFT must be reset to start the equipment, otherwise, the motor equipment cannot be started. MFT is the main fuel trip. The main fuel trip is the core content of boiler safety protection.
In the prior art, the steam pressure interlocking protection systems among the boiler, the air separation and the steam pipe network are independent from each other, and the content can be briefly described as follows:
1. if the single boiler is abnormally shut down, one air separation air compressor is interlocked and shut down;
2. if the single air separation air compressor is abnormally stopped, one boiler is interlocked and stopped;
3. and if the single air separation air compressor is abnormally stopped, the steam pipe network vent valve is opened in an interlocking manner.
However, in the actual operation process, the three conditions are coupled, and the problems that the steam pipe network cannot keep balance and the pressure of the pipe network is reduced instantly occur. The other air separation air compressors are abnormally stopped due to low pressure of a pipe network, and the remaining boiler is interlocked and stopped after the air separation air compressors are stopped. Finally, chain reaction is caused, the supply of steam, oxygen and nitrogen is insufficient, and the whole boiler, the air separation plant and the subsequent workshop section devices are dragged down, so that huge economic loss is caused to enterprises. Meanwhile, the risk of overpressure exists after the steam balance is damaged, and potential safety hazards exist.
The utility model provides an interlocking protection system between air separation plant and boiler plant modifies original design interlocking content, and the boiler blowing out leads to the empty air compressor machine of dividing to shut down the back after modifying, can not further make steam pipe network atmospheric valve open again, and steam pipe network balance can keep, and all the other devices can steady operation, avoid the enlarged ization of trouble.
Example 2:
in this embodiment, based on embodiment 1, the boiler device DCS controller receives various types of trigger signals of a boiler device site through an AI analog input card and a DI digital input card; the boiler device DCS controller receives an air separation air compressor running signal output by the air separation device DCS controller through the DO digital output card through the DI digital input card; the boiler device DCS controller is connected with the boiler MFT through a DO digital output clamping piece, and the boiler MFT is connected with the air separation device DCS controller through a DI digital input clamping piece.
Further, the space division unit DCS controller is connected with the steam pipe network DCS controller through a DI digital value input clamping piece.
Further, the steam pipe network DCS controller is connected with the emptying valve through a DO digital quantity output clamping piece.
Further, the boiler device DCS controller receives a trigger signal that two MFT emergency stop buttons of an auxiliary console of a boiler device site are pressed, a trigger signal that a fire detection cooling air main pipe pressure switch gives a low alarm, a trigger signal that a fire detection cooling fan operation signal disappears, a boiler total air quantity low alarm, a trigger signal that a delay is 30s, a trigger signal that a steam drum water level high alarm, a trigger signal that a steam drum water level low alarm, a trigger signal that a hearth negative pressure high alarm, a trigger signal that a hearth negative pressure low alarm, a trigger signal that an air feeder operation signal disappears, a trigger signal that an induced draft fan operation signal disappears, a trigger signal that a fire detection signal disappears, and a trigger signal that an air separation air compressor operation signal disappears through an AI analog quantity input clamping piece and a DI digital quantity input clamping piece.
The utility model discloses a theory of operation:
boiler plant, air separation plant are as common public engineering device of coal chemical industry enterprise, provide common materials such as steam, oxygen, nitrogen gas for follow-up workshop section commonly all the time, occupy very important position in whole factory. The abnormity of the boiler and the air separation unit can cause the fluctuation of each unit of the whole plant and even the large-area stop accident. At present, air separation air compressors of core equipment of most air separation devices use steam generated by a boiler as power, so that the coupling relation between the boiler and the air separation is increased.
At present, four boilers and 3 sets of air separation air compressors (namely air separation devices) are used, one boiler has three openings and is provided with one spare air separation air compressor in normal times, and three sets of air separation air compressors are operated completely. The steam yield of a single boiler is 230 tons/hour, the steam consumption of a single air separation air compressor is 180 tons/hour (basically, the steam yield of the single boiler is close to that of 1 boiler, and a small amount of residual steam enters a lower-level steam pipe network to be used by other users). Meanwhile, the steam pipe network is provided with an emptying valve, and when the valve is opened, the amount of released steam is approximately equal to the steam yield of a boiler. According to the initial design of a design institute, the steam pressure interlocking protection systems among the boiler, the air separation and the steam pipe network are independent from each other, and the content can be briefly described as follows:
1. if the single boiler is abnormally shut down, one air separation air compressor is interlocked and shut down;
2. if the single air separation air compressor is abnormally stopped, one boiler is interlocked and stopped;
3. and the steam pipe network vent valve is interlocked and opened when the single air separation air compressor is abnormally stopped.
From the steam balance point of view, the steam quantity consumed by a single air separation air compressor, the steam yield of a single boiler and the steam quantity released by a steam pipe network emptying valve are assumed to be consistent, and the values are Q. Viewed separately according to the existing interlock design, the situation is:
1. if the single boiler is abnormally shut down, one air separation air compressor is interlocked and shut down; after the single boiler is stopped, the steam yield is reduced by Q, and the steam consumption of the single air separation air compressor is reduced by Q, so that the total steam amount is balanced, and the rest boilers and the air separation air compressor can normally operate;
2. if the single air separation air compressor is abnormally stopped, one boiler is interlocked and stopped; namely, the steam consumption of a single air separation air compressor is reduced by Q, and the steam yield of a single boiler after the boiler is shut down is reduced by Q, so that the total steam quantity is balanced;
3. if the single air separation air compressor is abnormally shut down, the steam pipe network vent valve is opened in an interlocking manner; the steam consumption of a single air separation air compressor is reduced by Q, and the steam quantity Q which is not consumed by the air separation air compressor is released from the emptying valve because the boiler is still running, so that the total steam quantity can also reach balance;
the three conditions are not problematic when viewed alone, and the steam balance and the safe and stable operation of the device can be ensured through the interlocking arrangement. However, in the actual operation process, the coupling relation occurs in three cases. When an air separation air compressor breaks down, can stop a boiler simultaneously and open steam pipe network atmospheric valve, that is to say, single air separation air compressor steam consumption has lacked Q, but stop a boiler and make steam output lacked Q, open steam pipe network atmospheric valve simultaneously and make steam release Q in the pipe network again, whole pipe network has released Q steam flow more promptly, consequently, the steam pipe network can't keep balance, pipe network pressure descends in the twinkling of an eye, lead to other air separation air compressors to park because of pipe network pressure is low unusually, lead to remaining boiler interlock blowing out after the air separation air compressor shuts down again. Finally, chain reaction is caused, the supply of steam, oxygen and nitrogen is insufficient, and the whole boiler, the air separation plant and the subsequent workshop section devices are dragged down, so that huge economic loss is caused to enterprises. Meanwhile, the risk of overpressure exists after the steam balance is damaged, and potential safety hazards exist.
The utility model modifies the original design interlocking content, and interlocks and opens the steam pipe network vent valve when the single air separation air compressor is abnormally shut down; instead, the steam pipe network emptying valve can be opened only when the air separation air compressor is stopped due to non-boiler faults. After the modification, after the boiler is shut down, the air separation air compressor is shut down, the steam pipe network emptying valve is not further opened, the steam pipe network balance is kept, other devices can stably operate, the fault is avoided being enlarged, the system structure is shown in figure 1, the whole interlocking protection system is composed of three parts, and three sets of DCS systems are included.
1. The first part is a boiler device interlocking protection system, which comprises a set of DCS system and partial field transmitter, instrument, sensor and the like. Various transmitters and sensors on site connect a boiler drum liquid level signal, a hearth negative pressure signal, a fire detection signal, an induced draft fan operation signal and the like into an AI analog quantity input clamping piece and a DI digital quantity input clamping piece of a boiler device DCS system through signal cables, the clamping pieces transmit all signals into a boiler DCS controller to carry out logic operation, and when the signals exceed a preset numerical range, the interlocking protection logic triggers an action boiler MFT (main fuel cut-off protection) to act, so that the boiler is safely stopped. In order to eliminate interlocking misoperation caused by the self faults of the transmitter and the sensor, part of the transmitters are arranged. Three groups of sensor interlocks are arranged, and the controller performs logical judgment of two out of three to trigger the interlocks. The interlock trigger signal of the boiler plant comprises the following:
(1) The two MFT emergency stop buttons of the auxiliary console are pressed (connected with a boiler device DCS controller through a DI digital input card);
(2) A fire detection cooling air main pipe pressure switch is low to alarm (two out of three) (is connected with a boiler device DCS controller through a DI digital input clamping piece);
(3) The operation signal of the fire detection cooling fan disappears (the fire detection cooling fan is connected with a boiler device DCS controller through a DI digital input card);
(4) Alarming when the total air quantity of the boiler is low, delaying for 30s (connecting with a boiler device DCS controller through an AI digital quantity input card);
(5) A steam drum water level high alarm (connected with a boiler device DCS controller through an AI digital input card);
(6) A steam drum water level low alarm (connected with a boiler device DCS controller through an AI digital input card);
(7) A furnace chamber negative pressure high alarm (two out of three) (connected with a boiler device DCS controller through an AI digital input card);
(8) A hearth negative pressure low alarm (connected with a boiler device DCS controller through an AI digital input card);
(9) The running signals of the air feeder disappear (the DI digital input card is connected with a boiler device DCS controller);
(10) The operation signals of the induced draft fan disappear (the induced draft fan is connected with a DCS controller of the boiler device through a DI digital input card);
(11) The fire detection signals disappear (the fire detection signals are connected with a boiler device DCS controller through a DI digital input card);
(12) The running signal of the air separation air compressor disappears (the DI digital value input card is connected with a boiler device DCS controller);
any signal triggering can lead to boiler MFT interlocking blowing out, and simultaneously, the boiler DCS system sends MFT interlocking blowing out signals to the air separation device through a DO digital output card. In order to avoid false operation caused by card faults or line faults, 3 groups of cables are arranged on MFT furnace shutdown signals of each boiler, and a three-in-three interlocking mode is adopted to improve the reliability of interlocking.
In addition, as for item (12) above, the boiler is stopped when the operation signal of the air separation air compressor disappears, and a set of independent subprogram is designed in the boiler DCS controller, so that the plurality of air separation air compressors can interlock with the plurality of boilers. When the air separation system is provided with two air separation air compressors to stop, one boiler is stopped in an interlocking mode, and specifically which boiler is stopped is selected to be put into interlocking on an operation picture by a process; when the air separation system is provided with three air separation air compressors and stops, two boilers are stopped in an interlocking mode, and particularly which boiler is stopped is selected to be put into interlocking on an operation picture by a process. If only one air separation air compressor of the air separation plant stops, the boiler DCS controller does not perform any interlocking action, and the interlocking logic for opening the steam pipe network emptying valve is executed in the steam pipe network DCS controller.
2. The second part is an air separation device interlocking protection system which comprises a set of DCS system and corresponding sensor accessories. The system not only completes the self equipment interlocking protection of the air separation air compressor of the air separation device, but also introduces an MFT parking signal from a boiler device, and is accessed to the air separation DCS controller through a DI digital input card. The controller mainly completes three functions:
(1) And the interlocking logic of stopping the air separation air compressor after the boiler MFT is stopped is completed. Four boilers in normal working condition have three boilers to operate. When one of the three running boilers stops, interlocking and stopping one air separation air compressor; when two boilers are shut down, two air separation air compressors are interlocked and shut down; and when the three boilers are completely stopped, the three air separation air compressors are stopped in an interlocking manner. And specifically, which air separation air compressor is stopped can be selected in a program.
(2) And the logical judgment of whether the air separation air compressor is stopped or not and whether the boiler is stopped is finished. When the logic judgment shows that the parking of the air separation air compressor is not caused by the boiler blowing out, the air separation DCS sends a signal to the steam pipe network DCS, and the steam pipe network emptying valve is opened through the parallel lock; when the logic judges that the shutdown of the air separation air compressor is caused by the boiler shutdown, the system does not execute the interlocking action of opening the air release valve. In order to avoid false operation caused by card faults or line faults, 3 groups of cables are arranged for signals sent to the steam pipe network DCS system, and a three-in-one interlocking mode is adopted to improve the reliability of interlocking.
3. The third part is a steam pipe network device interlocking protection system, and the interlocking logic of interlocking opening of a steam pipe network emptying valve is mainly realized when one air separation air compressor is in fault shutdown (and the air separation DCS controller is required to judge that the air separation air compressor is not caused by boiler shutdown). Signals from the space division DCS enter the steam pipe network DCS controller through the DI digital quantity input clamping piece, after logic triggering, the DCS controller outputs a control command through the DO digital quantity output clamping piece, an emptying valve of the steam pipe network is opened, steam is released, and the situation that the steam pipe network is lack of users and overpressure due to the fact that the air division air compressor is stopped is avoided.
To sum up, compared with the prior art, the utility model discloses an interlocking protection system between air separation plant and boiler plant, the complicated interlocking coupling defect between fine solution coal chemical industry enterprise boiler, empty, the steam pipe net, when the abnormal conditions appears, avoided the enlarged scale of device parking accident, avoided a large amount of economic losses for the enterprise, also fine potential safety hazard of having avoidd.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.
Claims (5)
1. An interlock protection system between an air separation plant and a boiler plant, comprising:
the boiler device DCS subsystem comprises a boiler device DCS controller, and the boiler device DCS controller is connected with various transmitters and sensors on the site of the boiler device; the boiler device DCS controller is connected with the boiler MFT;
the air separation plant DCS subsystem comprises an air separation plant DCS controller, and the air separation plant DCS controller is connected with the boiler MFT and used for judging whether the air separation air compressor is jumped due to boiler failure; the air separation plant DCS controller is connected with the boiler plant DCS controller and is used for sending an air separation air compressor operation signal;
the steam pipe network device DCS subsystem comprises a steam pipe network DCS controller, and the steam pipe network DCS controller is connected with the air separation device DCS controller; and the steam pipe network DCS controller is connected with the emptying valve.
2. The interlocking protection system between the air separation plant and the boiler plant as claimed in claim 1, wherein said boiler plant DCS controller receives various kinds of trigger signals of the boiler plant site through an AI analog input card and a DI digital input card; the boiler device DCS controller receives an air separation air compressor running signal output by the air separation device DCS controller through the DO digital output card through the DI digital input card; the boiler device DCS controller is connected with the boiler MFT through a DO digital output clamping piece, and the boiler MFT is connected with the air separation device DCS controller through a DI digital input clamping piece.
3. The system of claim 2, wherein the air separation plant DCS controller is connected to the steam grid DCS controller via a DI digital input card.
4. The system of claim 1, wherein said steam pipe network DCS controller is connected to said blow-off valve via a DO digital output card.
5. The interlocking protection system between the air separation plant and the boiler plant as claimed in claim 2, characterized in that the boiler plant DCS controller receives the trigger signal of the fire detection cooling air main pipe pressure switch low alarm, the trigger signal of the fire detection cooling fan operation signal disappearance, the boiler total air volume low alarm, the trigger signal of the delay of 30s, the trigger signal of the steam pocket water level high alarm, the trigger signal of the steam pocket water level low alarm, the trigger signal of the furnace negative pressure high alarm, the trigger signal of the furnace negative pressure low alarm, the trigger signal of the blower operation signal disappearance, the trigger signal of the draught fan operation signal disappearance, the trigger signal of the fire detection signal disappearance and the trigger signal of the air separation air compressor operation signal disappearance through the AI analog input fastener and the DI digital input fastener.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121940491.XU CN218672119U (en) | 2021-08-18 | 2021-08-18 | Interlocking protection system between air separation device and boiler device |
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| CN202121940491.XU CN218672119U (en) | 2021-08-18 | 2021-08-18 | Interlocking protection system between air separation device and boiler device |
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| CN218672119U true CN218672119U (en) | 2023-03-21 |
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