CN117704286A - Medium-low pressure nitrogen press cooperation control method - Google Patents
Medium-low pressure nitrogen press cooperation control method Download PDFInfo
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- CN117704286A CN117704286A CN202311789538.0A CN202311789538A CN117704286A CN 117704286 A CN117704286 A CN 117704286A CN 202311789538 A CN202311789538 A CN 202311789538A CN 117704286 A CN117704286 A CN 117704286A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 476
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 236
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000007789 gas Substances 0.000 claims description 46
- 230000001276 controlling effect Effects 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000000007 visual effect Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 abstract description 11
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 4
- 238000013022 venting Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The invention relates to the technical field of nitrogen pressure of nitrogen, in particular to a cooperation control method of a medium-low pressure nitrogen press, which comprises the following steps: receiving shutdown information sent by a medium-pressure nitrogen compressor; controlling the first emptying valve to automatically adjust the emptying threshold, and rapidly adjusting the emptying threshold to a safety threshold C set in advance; the pressure information detected in real time by the second safety pressure detector and the maximum pressure value of the second safety pressure detector, which can be adjusted upwards, of the bearable pressure value of the air inlet pipe of the low-pressure nitrogen compressor are continuously monitored, so that the situation that the low-pressure nitrogen compressor is stopped due to the fact that the nitrogen gas at the low-pressure nitrogen compressor is overpressured in the operation control process is avoided, workers are provided with opportunities for capturing key information quickly while the workers operate empirically, and the possibility of misoperation is reduced.
Description
Technical Field
The invention relates to the field of nitrogen pressure of nitrogen, in particular to a cooperation control method of a medium-low pressure nitrogen press.
Background
In the process of nitrogen industrial preparation, nitrogen obtained after molecular sieve screening is shunted to an air precooling system, a medium-pressure nitrogen press and a low-pressure nitrogen press for further application, and nitrogen is compressed into nitrogen with different air pressures through the compression action of the medium-pressure nitrogen press and the low-pressure nitrogen press so as to be applied to a demand end.
In the process of split-flow application after nitrogen industrial production, the medium pressure nitrogen press can be shut down for the following reasons: the gas is excessively consumed at the gas outlet end of the medium-pressure nitrogen compressor to cause shutdown.
When the medium-pressure nitrogen compressor is in emergency stop, the nitrogen delivery pipe is required to be vented, if the air separation amount is not timely adjusted, a large amount of nitrogen can be caused to rush to the inlet of the low-pressure nitrogen compressor, the pressure of the inlet of the low-pressure nitrogen compressor is too high, the low-pressure nitrogen compressor is pulled and stopped, and a main line consumption accident is caused.
Disclosure of Invention
The invention aims to solve the defects that when an emergency shutdown of a medium-pressure nitrogen compressor exists in the prior art, if the air separation amount is not timely adjusted, a large amount of nitrogen is flushed to an inlet of the low-pressure nitrogen compressor, the pressure of the inlet of the low-pressure nitrogen compressor is too high, the low-pressure nitrogen compressor is stopped, and a main line dosage accident is caused.
In order to achieve the above purpose, the invention adopts the following technical scheme:
as an optional technical scheme, a cooperation control method of a medium-low pressure nitrogen press is provided, which comprises the following steps:
receiving shutdown information sent by a medium-pressure nitrogen compressor;
controlling the first emptying valve to automatically adjust the emptying threshold, and rapidly adjusting the emptying threshold to a safety threshold C set in advance;
receiving air pressure value information D obtained by detecting air pressure in an air inlet pipeline of the low-pressure nitrogen compressor by a second safety pressure detector and a maximum value E of allowable air pressure value information of the second safety pressure detector at the air inlet pipeline of the low-pressure nitrogen compressor;
subtracting the maximum value E of the air pressure value information D and the allowable air pressure value information of the second safety pressure detector to obtain a difference value F;
and sending a difference value F obtained by subtracting the maximum value E of the allowed air pressure value information regulated by the air pressure value information D and the second safety pressure detector to a display unit or a broadcasting unit, so that a worker can directly know the air pressure condition of an air inlet of the low-pressure nitrogen compressor, and providing a data basis for empirical judgment by manually regulating the air discharge amount of the first air discharge valve for the worker so as to satisfy the sufficiency of nitrogen at the low-pressure nitrogen compressor.
It should be understood that, under the condition that the first air release valve is automatically adjusted to the safety threshold value C, the main pipeline can be split in three directions through the first air release valve, the communicating pipe of the low-pressure nitrogen compressor and the communicating pipe of the air pre-cooling system, because under the normal condition, if the air pressure of the main pipeline does not excessively change, the pressure release capacity caused by the air release capacity of the first air release valve under the air release condition of the safety threshold value C can far exceed the pressurizing influence caused by the shutdown of the low-pressure nitrogen compressor, therefore, the pressure deficiency at the communicating pipe of the low-pressure nitrogen compressor and the communicating pipe of the air pre-cooling system can be caused, the staff is required to further carry out the callback of the first air release valve according to the actual requirement of the low-pressure nitrogen compressor, the air release threshold value is adjusted down, the air release capacity obtained by the whole main pipeline is reduced, and then the air flow at the low-pressure nitrogen compressor is further split to the communicating pipe of the air pre-cooling system, and then the air flow at the low-pressure nitrogen compressor is increased, and the air pressure at the low-pressure nitrogen compressor is increased until the air pressure value acceptable by the low-pressure nitrogen compressor is reached, and the low-pressure at the low-pressure nitrogen compressor is avoided.
Specifically, the shutdown information is a shutdown of the medium pressure nitrogen press due to excessive pre-valve pressure.
Further, also include
Generating first control information based on the received shutdown information sent by the medium-pressure nitrogen press, wherein the first control information is used for controlling a first emptying valve to adjust an emptying threshold value, and rapidly adjusting the emptying threshold value to a safety threshold value C set in advance;
and sending first control information to the first emptying valve.
Further, the method also comprises the steps of,
generating second control information based on the received shutdown information sent by the medium-pressure nitrogen press;
and sending second control information to the warning device to control the warning device to warn, so as to warn the working personnel that the medium-pressure nitrogen press is stopped and needs to be prepared for the next operation.
Further, also include
Receiving request information about to be started by a medium-pressure nitrogen press;
generating third control information according to the received request information about to be started by the medium-pressure nitrogen compressor so as to control the bearable pressure value of the second safety pressure detector at the air inlet pipe of the low-pressure nitrogen compressor to be adjusted up to a maximum pressure value;
transmitting third control information to the second safety pressure detector;
and displaying or broadcasting the maximum pressure value of the second safety pressure detector with the up-regulated bearable pressure value at the air inlet pipe of the low-pressure nitrogen compressor and the air pressure information detected by the second safety pressure detector in real time so as to provide reference for staff, and performing air discharge reduction adjustment of the first air discharge valve according to the combination experience of the maximum pressure value of the second safety pressure detector with the up-regulated bearable pressure value at the air inlet pipe of the low-pressure nitrogen compressor so as to prepare for opening the medium-pressure nitrogen compressor.
Specifically, the specific method for displaying or broadcasting the maximum pressure value of the upper adjustment of the bearable pressure value of the second safety pressure detector at the air inlet pipe of the low-pressure nitrogen compressor and the air pressure information detected by the second safety pressure detector in real time comprises the following steps:
receiving start notification information generated by a medium-pressure nitrogen compressor;
generating fourth control information based on receiving start-up notification information generated by the medium-pressure nitrogen press;
and sending fourth control information to the display unit or the broadcasting unit so as to control the display unit to display the opening state information or the broadcasting unit to broadcast the opening notification voice, so as to prompt the staff to continuously adjust the first emptying valve and continuously reduce the emptying amount of the first emptying valve.
Further, also include
Generating fifth control information based on the request information about to be opened of the medium-pressure nitrogen compressor so as to control the first safety pressure detector to send the detected air pressure value in real time;
sending a fifth control signal to the first safety pressure detector;
receiving in real time the air pressure value information detected by the first safety pressure detector;
subtracting the air pressure value information detected by the first safety pressure detector and the low jump value adjusted by the first safety pressure detector, which are received in real time, to obtain a difference value H;
and sending the difference value H to a display unit or a broadcasting unit to display through the display unit or broadcast the difference value H through the broadcasting unit.
Further, also include
Receiving a first gas flow rate at an air inlet of the low-pressure nitrogen compressor detected by a gas flow rate sensor when the medium-pressure nitrogen compressor works normally and a second gas flow rate at the air inlet of the low-pressure nitrogen compressor detected by the gas flow rate sensor when the medium-pressure nitrogen compressor is stopped;
performing difference operation on the first gas flow rate and the second gas flow rate to obtain a difference J;
if the difference J is a negative value, the air discharge quantity is insufficient, so that the air pressure at the air inlet of the low-pressure nitrogen compressor is increased, and the air flow rate is increased;
and automatically adjusting the emptying threshold value of the first emptying valve to be higher based on the result of insufficient emptying amount obtained by the negative value information of the difference J.
Further, also include
If the difference J is a positive value, the air discharge amount is excessively large, so that the air pressure at the air inlet of the low-pressure nitrogen compressor is reduced, and the air flow rate is reduced;
and sending result information of overlarge emptying amount and positive value information of the difference J, which are obtained based on the positive value information of the difference J, to a display unit or a broadcasting unit so as to remind a worker to lower the emptying threshold value of the first emptying valve and inform the positive value information of the difference J.
Further, also include
Receiving the information of the air pressure value, detected by a third safety pressure detector, of which the pre-valve pressure at the air outlet end of the medium-pressure nitrogen machine is less than or equal to 1.55 Mpa;
generating seventh control information to control the audible and visual alarm device to send out audible and visual alarm, and warning to inform staff of reducing the use of nitrogen;
and sending seventh control information to the audible and visual alarm device.
Compared with the prior art, the invention has the following beneficial effects:
the difference F obtained by subtracting the maximum value E of the allowed air pressure value information regulated by the air pressure value information D and the second safety pressure detector is sent to a display unit or a broadcasting unit, so that a worker can directly know the air pressure condition of an output port of the low-pressure nitrogen compressor, the data basis for empirically judging is provided for manually regulating the air discharge quantity of the first air discharge valve by the worker so as to satisfy the sufficiency of nitrogen at the low-pressure nitrogen compressor, and the improvement of the regulation accuracy of the worker and the guarantee of the regulation air discharge rationality are facilitated.
The pressure information detected in real time by the second safety pressure detector and the maximum pressure value of the second safety pressure detector, which can be adjusted upwards, of the bearable pressure value of the air inlet pipe of the low-pressure nitrogen compressor are continuously monitored, so that the situation that the low-pressure nitrogen compressor is stopped due to the fact that the nitrogen gas at the low-pressure nitrogen compressor is overpressured in the operation control process is avoided, workers are provided with opportunities for capturing key information quickly while the workers operate empirically, and the possibility of misoperation is reduced.
And the result of insufficient emptying amount obtained based on the negative value information of the difference J automatically increases the emptying threshold value of the first emptying valve, makes quick response, and is beneficial to reducing the probability of accident occurrence.
Drawings
FIG. 1 is a schematic diagram of a medium and low pressure nitrogen system of the present invention;
FIG. 2 is a flow chart of a control method of the present invention;
FIG. 3 is a block diagram of a system according to the present invention.
In the figure: 201. a first safety pressure detector; 202. a second safety pressure detector; 203. a first control valve; 204. a second control valve; 205. a third safety pressure detector; 301. a return valve; 401. a first vent valve; 402. a second vent valve; 403. a third vent valve; 501. a medium pressure nitrogen press; 502. a low pressure nitrogen press; 601. a receiving unit; 602. a control unit; 603. a processing unit; 604. and a transmitting unit.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
In order to better understand the method for controlling the cooperation of the low-pressure nitrogen press, the nouns related to the embodiment of the invention are explained first.
As shown in fig. 1, in the process of industrial nitrogen preparation, nitrogen obtained after molecular sieve screening is split into an air pre-cooling system, a medium-pressure nitrogen press 501 and a low-pressure nitrogen press 502 for further application, and the nitrogen is compressed into nitrogen with different air pressures through the compression action of the medium-pressure nitrogen press 501 and the low-pressure nitrogen press 502 so as to be applied to a demand end.
A first safety pressure detector 201 for detecting a gas pressure at an intake pipe of the medium-pressure nitrogen compressor 501, and may set a low jump value;
a second safety pressure detector 202 for detecting the gas pressure at the gas inlet pipe of the low-pressure nitrogen compressor 502, and may set a high jump value and a low jump value;
a third safety pressure detector 205 for detecting the gas pressure at the gas outlet pipe of the medium-pressure nitrogen compressor 501, and may set a low jump value;
a first control valve 203 for controlling the intake air flow rate of the air pre-cooling system by control of the valve;
the second control valve 204 is used for controlling the flow rate of the nitrogen gas which is delivered from the gas outlet end of the medium-pressure nitrogen compressor 501 to the nitrogen gas demand end;
a reflux valve 301 for carrying out reflux application on the gas of which the nitrogen pressure of the low-pressure nitrogen compressor 502 is completed and the gas is not applied by the demand end;
the first air release valve 401 is used for performing control adjustment of nitrogen air release when the medium-pressure nitrogen press 501 is stopped;
a second venting valve 402, configured to vent the gas after the nitrogen pressure of the medium-pressure nitrogen compressor 501 is completed, with the remaining gas not applied by the demand end;
a third venting valve 403, configured to vent the gas after the nitrogen pressure of the low-pressure nitrogen compressor 502 is completed, with the remaining gas not applied by the demand end;
a gas flow rate sensor for detecting the gas flow rate at the gas inlet of the low pressure nitrogen compressor 502.
As shown in fig. 2, a method for controlling the cooperation of a low-and-medium-pressure nitrogen press is provided, which comprises the following steps:
101. receiving shutdown information sent by the medium pressure nitrogen press 501;
specifically, the shutdown information is that the medium pressure nitrogen press 501 is shutdown due to excessive pre-valve pressure.
102. The first emptying valve 401 is controlled to automatically adjust the emptying threshold value, and the emptying threshold value is quickly adjusted to a safety threshold value C set in advance;
it should be understood that the first blow-off valve 401 has a blow-off threshold value that can be adjusted, and may have two modes, one mode is an automatic control mode, and the other mode is a mode that requires manual operation of a worker to input control information, and the control module controls the blow-off threshold value through the control information;
specifically, the automatic control mode includes a threshold adjustment unit, after receiving the shutdown information sent by the medium-pressure nitrogen press 501, the server automatically generates corresponding control information under the action of a program stored in a memory, and sends the control information to the threshold adjustment unit, and the control threshold adjustment unit directly adjusts the threshold of the first blow-out valve 401 to a safety threshold C set in advance;
the manual control mode includes a threshold control unit, after the server receives the shutdown information sent by the medium-pressure nitrogen press 501, the threshold control unit is controlled to be in a to-be-controlled state after the threshold of the first emptying valve 401 is directly adjusted to a safety threshold set in advance, and a worker inputs control information through a control panel to control the threshold control unit to adjust the threshold of the first emptying valve 401, so that the worker can reasonably adjust according to experience.
It should be understood that the safety threshold C refers to a specified threshold to which the first vent valve 401 may be adjusted by venting the nitrogen in the nitrogen manifold to avoid excessive manifold pressure caused by unconsumed nitrogen in order to avoid shutting down the medium pressure nitrogen press 501 when the medium pressure nitrogen press 501 is shut down by a worker in accordance with a normal venting state of a pipeline.
103. Receiving air pressure value information D obtained by detecting air pressure in an air inlet pipeline of the low-pressure nitrogen compressor 502 by the second safety pressure detector 202 and a maximum value E of allowable air pressure value information of the second safety pressure detector 202 at the air inlet pipeline of the low-pressure nitrogen compressor 502;
it should be appreciated that the second safety pressure detector 202 is a detector that detects the pressure of the gas entering the low pressure nitrogen compressor 502, the second safety pressure detector 202 itself is a unit that detects the gas pressure, and can adjust acceptable maximum and minimum gas pressure values, where maximum and minimum gas pressure values refer to low and high jump values commonly known in the art, and when the gas pressure is above or approaches the maximum gas pressure value, the second safety pressure detector 202 can send a signal to a server by which the low pressure nitrogen compressor 502 is controlled to shut down, avoiding damage to the low pressure nitrogen compressor 502.
104. Subtracting the maximum value E of the allowable air pressure value information of the second safety pressure detector 202 from the air pressure value information D to obtain a difference value F;
105. the difference value F obtained by subtracting the maximum value E of the allowed air pressure value information regulated by the air pressure value information D and the second safety pressure detector 202 is sent to a display unit or a broadcasting unit, so that a worker can directly know the air pressure condition of the air inlet of the low-pressure nitrogen compressor 502, and an empirically judged data basis is provided for the worker to manually regulate the air discharge amount of the first air discharge valve 401 to meet the sufficiency of nitrogen at the low-pressure nitrogen compressor 502.
It should be understood that, under the condition that the first air release valve 401 is automatically adjusted to the safety threshold value C, the main pipeline will be split in three directions through the first air release valve 401, the communicating pipe of the low-pressure nitrogen compressor 502 and the communicating pipe of the air pre-cooling system, because under the normal condition, if the air pressure of the main pipe does not excessively change, the pressure release capacity of the first air release valve 401 brought by the air release capacity of the safety threshold value C can be far influenced by the pressure increase caused by stopping the low-pressure nitrogen compressor 501, therefore, the pressure deficiency at the communicating pipe of the low-pressure nitrogen compressor 502 and the communicating pipe of the air pre-cooling system can be caused, the staff is required to further carry out the callback of the first air release valve 401 according to the actual requirement of the low-pressure nitrogen compressor 502, the air release threshold value is adjusted to be low, the air release amount obtained by the whole main pipe is reduced, and then the air flow at the communicating pipe of the low-pressure nitrogen compressor 502 is split to the communicating pipe of the air pre-cooling system, so that the air flow at the low-pressure nitrogen compressor 502 is increased, and the air pressure at the low-pressure nitrogen compressor 502 can be prevented from being stopped due to the low-pressure at the low-pressure nitrogen compressor 502.
Specifically, also include
Generating first control information based on the received shutdown information sent by the medium-pressure nitrogen compressor 501, wherein the first control information is used for controlling the first blow valve 401 to adjust the blow threshold value, and quickly adjusting the blow threshold value to a safety threshold value C set in advance;
first control information is sent to the first blow-off valve 401.
It should be understood that, based on receiving the shutdown information sent by the medium-pressure nitrogen compressor 501, the server generates first control information and sends the first control information to the first blow-down valve 401, so as to control an adjusting unit inside the first blow-down valve 401 to adjust the threshold value to a safety threshold value C set in advance, blow down the nitrogen, and further obtain the pressure relief effect, so as to ensure that the air pressure of the main pipeline is within an acceptable range.
As a further embodiment, the method further comprises,
generating second control information based on receiving shutdown information sent by the medium-pressure nitrogen press 501
And sending second control information to the warning device to control the warning device to warn the working personnel that the medium-pressure nitrogen press 501 is stopped, and the working personnel needs to be ready for the next operation.
It should be appreciated that when the medium-pressure nitrogen compressor 501 is stopped and the first air release valve 401 is automatically adjusted to the safety threshold value C, a worker needs to adjust back the first air release valve 401 according to experience, so that the pressure at the port of the low-pressure nitrogen compressor 502 is increased to meet the requirement of the low-pressure nitrogen compressor 502, the warning device is controlled in time to warn, the worker is reminded to respond quickly, the next step of work is operated, and the situation that the low-pressure nitrogen compressor 502 is stopped due to insufficient air pressure at the low-pressure nitrogen compressor 502 caused by delay is avoided.
As a further embodiment, it also includes
Receiving request information about to be started by the medium-pressure nitrogen compressor 501;
generating third control information to control the affordable pressure value of the second safety pressure detector 202 at the intake pipe of the low-pressure nitrogen compressor 502 to be adjusted up to a maximum pressure value according to the received request information to be started by the medium-pressure nitrogen compressor 501;
sending third control information to the second safety pressure detector 202;
the maximum pressure value of the second safety pressure detector 202 with the up-regulated bearable pressure value at the air inlet pipe of the low-pressure nitrogen compressor 502 and the air pressure information detected by the second safety pressure detector 202 in real time are displayed or broadcasted to provide a reference for a worker, and the air discharge amount reduction adjustment of the first air discharge valve 401 is performed according to the maximum pressure value of the up-regulated bearable pressure value of the second safety pressure detector 202 at the air inlet pipe of the low-pressure nitrogen compressor 502 combined with experience so as to prepare for the opening of the medium-pressure nitrogen compressor 501.
It should be understood that, when the nitrogen demand of the low-pressure nitrogen compressor 502 is satisfied, in order to provide a certain amount of nitrogen for the low-pressure nitrogen compressor 501 to be started, the first air release valve 401 may be further retracted under the condition that the maximum pressure value that the second safety pressure detector 202 at the low-pressure nitrogen compressor 502 can bear is satisfied, so that the medium-pressure nitrogen compressor 501 may be supplied with nitrogen during the starting process, and the air flow at the low-pressure nitrogen compressor 502 is not excessively affected to cause stopping, a specific retraction amplitude is required, a worker adjusts according to experience, before the retraction, the server generates third control information based on the received request information about the low-pressure nitrogen compressor 501 to be started, and sends the third control information to the second safety pressure detector 202, and the second safety pressure detector 202 adjusts the bearable air pressure value to the maximum, and the second safety pressure detector 202 displays the maximum value after the bearable air pressure value and the maximum pressure value in real time, or the air pressure information detected by the second safety pressure detector 202 in real time, the air inlet pipe is not influenced by the air flow at the low-pressure detector 502, the time, the real-time information is prevented from being provided by the high pressure sensor 202, and the high pressure information about the maximum pressure value detected by the second safety pressure detector 202, and the real-time information about the maximum pressure value detected by the low pressure detector 202 is simultaneously, and the real-time information about the pressure detected by the high pressure of the low pressure detector 502, is beneficial to reducing the possibility of misoperation.
Specifically, the specific method for displaying or broadcasting the maximum pressure value of the up-regulated bearable pressure value of the second safety pressure detector 202 at the air inlet pipe of the low-pressure nitrogen compressor 502 and the air pressure information detected by the second safety pressure detector 202 in real time includes the following steps:
receiving start notification information generated by the medium pressure nitrogen press 501;
generating fourth control information based on receiving start-up notification information generated by the medium-pressure nitrogen compressor 501;
and sending fourth control information to the display unit or the broadcasting unit so as to control the display unit to display the opening state information or the broadcasting unit to broadcast the opening notification voice, so as to prompt the staff to continuously adjust the first emptying valve 401 and continuously reduce the emptying amount of the first emptying valve 401.
As a further embodiment, it also includes
Generating fifth control information based on the request information about to turn on the medium-pressure nitrogen compressor 501 to control the first safety pressure detector 201 to transmit the detected air pressure value in real time;
sending a fifth control signal to the first safety pressure detector 201;
receiving the air pressure value information detected by the first safety pressure detector 201 in real time;
subtracting the air pressure value information detected by the first safety pressure detector 201 and the low jump value of the first safety pressure detector 201, which are received in real time, to obtain a difference H;
and sending the difference value H to a display unit or a broadcasting unit to display through the display unit or broadcast the difference value H through the broadcasting unit.
It should be understood that, during the process of starting the medium-pressure nitrogen compressor 501, a worker may input control information, gradually return the first air release valve 401, during the return process, the air pressure before the medium-pressure nitrogen compressor 501 may gradually increase, and through the control of the server, subtraction is performed between the air pressure value information detected by the first safety pressure detector 201 and the low jump value of the first safety pressure detector 201, which is received in real time, to obtain a difference H, and the difference H is sent to a display unit or a broadcasting unit to be displayed through the display unit or broadcast the difference H through the broadcasting unit, so that the worker may obtain real-time information, and the real-time pressure value change of the air pressure at the medium-pressure nitrogen compressor 501 is conveniently monitored in real time during the operation control, so as to provide a reference for experience operation.
As a further embodiment, it also includes
Receiving a first gas flow rate at an air inlet of the low-pressure nitrogen compressor 502 detected by a gas flow rate sensor when the medium-pressure nitrogen compressor 501 is operating normally and a second gas flow rate at an air inlet of the low-pressure nitrogen compressor 502 detected by the gas flow rate sensor when the medium-pressure nitrogen compressor 501 is stopped;
performing difference operation on the first gas flow rate and the second gas flow rate to obtain a difference J;
if the difference J is negative, it indicates that the air discharge is insufficient, resulting in an increase in air pressure at the air inlet of the low pressure nitrogen compressor 502 and an increase in air flow rate;
the result of the insufficient purge amount based on the negative value information of the difference J automatically adjusts the purge threshold of the first purge valve 401 high.
It should be understood that, the safety threshold C of the first venting valve 401 is obtained by combining the conventional gas flow conditions of the main nitrogen pipeline by a worker according to the long-time practice process, and the actual needs of the air pre-cooling system for splitting, the middle-pressure nitrogen compressor 501 for splitting and the low-pressure nitrogen compressor 502 for splitting, when the middle-pressure nitrogen compressor 501 is stopped, nitrogen with a certain threshold needs to be vented so as to meet the influence of the amount of nitrogen which cannot be consumed by the middle-pressure nitrogen compressor on the air pressure, and for safety, the venting valve 401 can be vented through the first venting valve 401 to be greater than the value which is usually required, so that the air pressure safety of the whole system can be ensured, but the nitrogen flow of the main pipeline is unstable, the condition of nitrogen flow fluctuation can occur, if the worker fails to set the safety threshold C of the first venting valve 401 through the experience under the normal condition or does not meet the actual fluctuation, the pipeline safety accident and the nitrogen supply stagnation can be caused by not being timely adjusted, the embodiment can be used for timely monitoring the condition to quickly adjust the first venting valve 401, so that the venting valve is worth achieving the high air-pressure, the safety of the safety accident is reduced, and the following specific implementation process is performed as follows:
when the medium-pressure nitrogen compressor 501 is stopped, the first air release valve 401 is automatically adjusted to a safety threshold value C set by a worker in advance according to experience, and if the flow rate sensor at the low-pressure nitrogen compressor 502 detects that the second gas flow rate is larger than the first gas flow rate detected by the flow rate sensor before the medium-pressure nitrogen compressor 501 is stopped, the air release amount of the first air release valve 401 is insufficient, because the air pressure at the low-pressure nitrogen compressor 502 is supposed to be reduced, the flow rate is increased, the air release amount is increased, and the air release amount is increased instead, and the air release threshold value of the first air release valve 401 is automatically adjusted to be high according to the result of insufficient air release amount obtained by negative value information of the difference J, so that quick response is made, and the probability of accident occurrence is reduced.
Specifically, the method for automatically adjusting the emptying threshold of the first emptying valve 401 to be higher based on the result of insufficient emptying amount obtained by the negative value information of the difference value J includes the following steps:
the server receives result information of insufficient emptying amount obtained by comparing the difference J with the gas flow information III;
the server generates sixth control information based on the result information of insufficient air discharge obtained by comparing the difference J with the third air flow information, wherein the sixth control information is used for controlling the first air discharge valve 401 to automatically raise the safety threshold value C set in advance so as to adjust according to the actual pipeline pressure condition, thereby being beneficial to reducing the probability of safety accidents;
the sixth control information is sent to the first blow-off valve 401 to realize the control of raising the safety threshold C set in advance.
As a further embodiment, it also includes
If the difference J is positive, it indicates that the air discharge is too large, resulting in a decrease in air pressure at the air inlet of the low pressure nitrogen compressor 502 and a decrease in air flow rate;
and sending the result information of the overlarge emptying amount and the positive value information of the difference J, which are obtained based on the positive value information of the difference J, to a display unit or a broadcasting unit so as to remind a worker to lower the emptying threshold value of the first emptying valve 401 and inform the positive value information of the difference J.
It should be understood that under normal conditions, when the safety threshold C of the first blow valve 401 is automatically adjusted, the situation that the air pressure is insufficient at the low-pressure nitrogen compressor 502 will occur, the worker will often adjust the first blow valve 401 at the first time and adjust it based on experience, and in this embodiment, the worker is reminded to adjust the blow threshold of the first blow valve 401 by sending the result information of the excessive blow amount obtained based on the positive value numerical information of the difference J and the positive value numerical information of the difference J to the display unit or the broadcasting unit, and inform the positive value numerical information of the difference J, which is favorable for the worker to obtain the positive value numerical information of the difference J in the process of inputting the control information to adjust the first blow valve 401, assist in judging, and avoid negative effects caused by excessive dependence on experience callback amplitude.
As a further embodiment, it also includes
Receiving the information of the air pressure value, which is detected by the third safety pressure detector 205, of the air outlet end of the medium-pressure nitrogen machine, wherein the pressure before the valve is less than or equal to 1.55 Mpa;
generating seventh control information to control the audible and visual alarm device to send out audible and visual alarm, and warning to inform staff of reducing the use of nitrogen;
and sending seventh control information to the audible and visual alarm device.
It should be understood that after nitrogen is compressed by the medium-pressure nitrogen compressor 501, gas is conveyed to the demand end for application, and the consumption of the demand end is too fast, which can cause the air pressure of the air outlet end of the medium-pressure nitrogen compressor 501 to be reduced, and the pull and stop are easy to be caused, so that the embodiment can solve the problems as follows:
the server receives the air pressure value information of the air outlet end of the medium-pressure nitrogen machine, detected by the third air pressure sensor, that is, the air pressure value information of the air outlet end of the medium-pressure nitrogen machine, wherein the air pressure value information is less than or equal to 1.55 Mpa, seventh control information is generated, and the seventh control information is sent to the audible and visual annunciator so as to warn a worker that the demand end needs to be controlled, so that the condition that the air outlet end of the medium-pressure nitrogen machine 501 is reduced to cause the stop is avoided, and the possibility of the condition that the medium-pressure nitrogen machine 501 is stopped is further reduced.
As shown in fig. 3, a low-and-medium-pressure nitrogen press cooperation control system is provided, which comprises the following units:
a receiving unit 601, configured to receive shutdown information sent by the medium-pressure nitrogen compressor 501; and is further configured to receive air pressure value information D obtained by detecting air pressure in the air intake pipe of the low-pressure nitrogen compressor 502 by the second air pressure sensor and a maximum value E of allowable air pressure value information of the second safety pressure detector 202 that controls flow rate of the air intake pipe of the low-pressure nitrogen compressor 502;
a control unit 602, configured to control the first blow-off valve 401 to automatically adjust the blow-off threshold, and quickly adjust the blow-off threshold to a safety threshold C set in advance;
a processing unit 603, configured to perform subtraction processing on the air pressure value information D and the maximum value E of the allowable air pressure value information of the second safety pressure detector 202, to obtain a difference value F;
the sending unit 604 is configured to send the difference value F obtained by subtracting the maximum value E of the allowed air pressure value information adjusted by the air pressure value information D and the second safety pressure detector 202 to the display unit or the broadcasting unit, so that a worker can directly know the air pressure condition of the air inlet of the low pressure nitrogen compressor 502, and provide a data basis for empirical judgment for manually adjusting the air discharge amount of the first air discharge valve 401 by the worker to satisfy the nitrogen sufficiency at the low pressure nitrogen compressor 502.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, but rather, the foregoing embodiments and description illustrate the principles of the invention, and that various changes and modifications may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. The cooperation control method of the medium-low pressure nitrogen press is characterized by comprising the following steps of:
receiving shutdown information sent by a medium-pressure nitrogen compressor (501);
the first emptying valve (401) is controlled to automatically adjust the emptying threshold, and the emptying threshold is quickly adjusted to a safety threshold C set in advance;
receiving air pressure value information D obtained by detecting air pressure in an air inlet pipeline of the low-pressure nitrogen compressor (502) by a second safety pressure detector (202) and a maximum value E of allowable air pressure value information of the second safety pressure detector (202) at the air inlet pipeline of the low-pressure nitrogen compressor (502);
subtracting the maximum value E of the air pressure value information D and the allowable air pressure value information of the second safety pressure detector (202) to obtain a difference value F;
and sending a difference value F obtained by subtracting the maximum value E of the allowed air pressure value information regulated by the air pressure value information D and the second safety pressure detector (202) to a display unit or a broadcasting unit, so that a worker can directly know the air pressure condition of the air inlet of the low-pressure nitrogen compressor (502), and providing a data basis for empirical judgment for manually regulating the air discharge amount of the first air discharge valve (401) by the worker so as to meet the condition that the nitrogen at the low-pressure nitrogen compressor (502) is sufficient.
2. A method of co-operating control of a medium and low pressure nitrogen press according to claim 1, characterized in that the shut down information is a shut down of the medium pressure nitrogen press (501) due to an excessive pre-valve pressure.
3. The method for controlling the cooperation of a low-and-medium-pressure nitrogen compressor according to claim 1, further comprising
Generating first control information based on the received shutdown information sent by the medium-pressure nitrogen compressor (501), wherein the first control information is used for controlling a first emptying valve (401) to adjust an emptying threshold value, and rapidly adjusting the emptying threshold value to a safety threshold value C set in advance;
first control information is sent to a first vent valve (401).
4. A method for controlling the fit of a low-and-medium-pressure nitrogen compressor according to claim 3, further comprising,
generating second control information based on receiving shutdown information sent by the medium-pressure nitrogen press (501);
and sending second control information to the warning device to control the warning device to warn, and warning the working personnel that the medium-pressure nitrogen press (501) is stopped and needs to be prepared for the next operation.
5. The method for controlling the cooperation of a low-and-medium-pressure nitrogen compressor according to claim 4, further comprising
Receiving request information about to be started by the medium-pressure nitrogen compressor (501);
generating third control information according to the received request information about to be started by the medium-pressure nitrogen compressor (501) so as to control the bearable pressure value of the second safety pressure detector (202) at the air inlet pipe of the low-pressure nitrogen compressor (502) to be adjusted upwards to a maximum pressure value;
transmitting third control information to the second safety pressure detector (202);
the maximum pressure value of the upper pressure value of the second safety pressure detector (202) at the air inlet pipe of the low-pressure nitrogen compressor (502) and the air pressure information detected by the second safety pressure detector (202) in real time are displayed or broadcasted so as to provide reference for staff, and the air discharge amount of the first air discharge valve (401) is reduced and adjusted according to the maximum pressure value of the upper pressure value of the second safety pressure detector (202) at the air inlet pipe of the low-pressure nitrogen compressor (502) combined with experience so as to prepare for the opening of the medium-pressure nitrogen compressor (501).
6. The method for controlling the cooperation of the low-pressure and medium-pressure nitrogen compressors according to claim 5, wherein the specific method for displaying or broadcasting the maximum pressure value of the up-regulated bearable pressure value of the second safety pressure detector (202) at the air inlet pipe of the low-pressure nitrogen compressor (502) and the air pressure information detected by the second safety pressure detector (202) in real time comprises the following steps:
receiving start notification information generated by a medium-pressure nitrogen compressor (501);
generating fourth control information based on receiving start-up notification information generated by the medium-pressure nitrogen press (501);
and sending fourth control information to the display unit or the broadcasting unit so as to control the display unit to display the opening state information or the broadcasting unit to broadcast the opening notification voice, so as to prompt the staff to continuously adjust the first emptying valve (401) and continuously reduce the emptying amount of the first emptying valve (401).
7. The method for controlling the cooperation of a low-and-medium-pressure nitrogen compressor according to claim 6, further comprising
Generating fifth control information based on the request information about to turn on the medium-pressure nitrogen compressor (501) to control the first safety pressure detector (201) to transmit the detected air pressure value in real time;
sending a fifth control signal to the first safety pressure detector (201);
receiving in real time the air pressure value information detected by the first safety pressure detector (201);
subtracting the air pressure value information detected by the first safety pressure detector (201) and the low jump value adjusted by the first safety pressure detector (201) which are received in real time to obtain a difference value H;
and sending the difference value H to a display unit or a broadcasting unit to display through the display unit or broadcast the difference value H through the broadcasting unit.
8. The method for controlling the cooperation of a low-and-medium-pressure nitrogen compressor according to claim 7, further comprising
Receiving a first gas flow rate at an air inlet of a low-pressure nitrogen compressor (502) detected by a gas flow rate sensor when the medium-pressure nitrogen compressor (501) is in normal operation and a second gas flow rate at the air inlet of the low-pressure nitrogen compressor (502) detected by the gas flow rate sensor when the medium-pressure nitrogen compressor (501) is stopped;
performing difference operation on the first gas flow rate and the second gas flow rate to obtain a difference J;
if the difference J is negative, the air discharge quantity is insufficient, so that the air pressure at the air inlet of the low-pressure nitrogen compressor (502) is increased;
and automatically adjusting the emptying threshold value of the first emptying valve (401) to be higher based on the result of insufficient emptying amount obtained by the negative value information of the difference J.
9. The method for controlling the cooperation of a low-and-medium-pressure nitrogen compressor according to claim 8, further comprising
If the difference J is positive, the air discharge amount is excessively large, so that the air pressure at the air inlet of the low-pressure nitrogen compressor (502) is reduced, and the air flow rate is reduced;
and sending result information of overlarge emptying amount and positive value information of the difference J, which are obtained based on the positive value information of the difference J, to a display unit or a broadcasting unit so as to remind a worker to lower the emptying threshold value of the first emptying valve (401) and inform the positive value information of the difference J.
10. The method for controlling the cooperation of a low-and-medium-pressure nitrogen compressor according to claim 1, further comprising
Receiving the information of the air pressure value, detected by a third safety pressure detector (205), of which the pre-valve pressure at the air outlet end of the medium-pressure nitrogen machine is less than or equal to 1.55 Mpa;
generating seventh control information to control the audible and visual alarm device to send out audible and visual alarm, and warning to inform staff of reducing the use of nitrogen;
and sending seventh control information to the audible and visual alarm device.
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| CN117927873A (en) * | 2024-03-25 | 2024-04-26 | 玉得气体有限责任公司 | Method and system for controlling amount of nitrogen in balance pipeline |
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