CN113049176A - Method for online dredging and anti-blocking of pressure guide pipe - Google Patents
Method for online dredging and anti-blocking of pressure guide pipe Download PDFInfo
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- CN113049176A CN113049176A CN201911367311.0A CN201911367311A CN113049176A CN 113049176 A CN113049176 A CN 113049176A CN 201911367311 A CN201911367311 A CN 201911367311A CN 113049176 A CN113049176 A CN 113049176A
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- G01L19/0015—Fluidic connecting means using switching means
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Abstract
A method for on-line dredging and anti-blocking of a pressure guide pipe belongs to the field of detection. Three two-position three-way electromagnetic valves, two manual discharge valves and corresponding communication pipelines are additionally arranged on a pressure transmitter on the original main cooling water pipeline and a pressure guide pipe of a pressure gauge; through switching, the operation to relevant valve, under the prerequisite of guaranteeing pressure transmitter incessant on-line measuring cooling water main pipe pressure value data in succession, can carry out online, the clearance of not shutting down, mediation to the connecting pipe of pressure transmitter and manometer at any time to can reliably prevent the jam of connecting pipe, can avoid the emergence of the wrong report of equipment operating parameter police, mistake parking trouble. The pressure pipe connecting device can be widely applied to the fields of operation maintenance and daily maintenance of pressure transmitting pipes of various pressure transmitters and pressure gauges.
Description
Technical Field
The invention belongs to the field of detection, and particularly relates to an online dredging and anti-blocking method for a pressure guide pipe for instrument detection.
Background
In the industrial production process, cooling water is generally used for cooling production equipment or process media, so that the production equipment and the production process are protected from being normally performed, and therefore, the pressure in a cooling water pipeline needs to be monitored to ensure pressure parameters required by normal production.
Referring to fig. 1, a nitrogen press is a device that compresses and boosts low pressure nitrogen gas to a pressure required by a user and delivers it to the user. The low-pressure nitrogen is compressed by a 1-stage impeller, then is cooled by a 1-stage cooler, is sent to a next-stage impeller, is compressed and cooled again until the low-pressure nitrogen is compressed and cooled for 3 times, and then is pressurized into high-pressure nitrogen. The cooler is used for exchanging heat of circulating cooling water (cooling water for short) in a state of being isolated from nitrogen, and the circulating cooling water returns to the cooling water tank after passing through the cooler.
In order to achieve the required heat exchange effect, the supply pressure of the cooling water must reach a design value to prevent the compressor from being damaged due to overheating, and thus the supply pressure of the cooling water must be monitored in real time. In particular, the water pressure in the water supply line of the recirculating cooling water system required for the intercoolers of the compressor is particularly important.
Referring to fig. 2, the water pressure in the circulating water supply pipeline (referred to as water supply pipeline for short) is detected by guiding the water pressure in the cooling water main pipeline to a pressure transmitter PB through a sampling hole, a root short pipe, a sampling primary valve V1, a pressure guiding pipe G1 and a sampling secondary valve V2 on the field cooling water main pipeline, and the pressure transmitter transmits the detected pressure value to a DCS (Distributed Control System) of a central Control room through an electric signal for monitoring, wherein the signal participates in the start condition interlock and the fault trip interlock (the name of fault shutdown) of the production equipment, i.e. the compressor.
Meanwhile, in order to facilitate the on-site direct observation of the pressure of cooling water in the cooling water main pipeline by inspectors, a pressure gauge P is also arranged on the on-site design, the water pressure of the cooling water main pipeline is guided to the pressure gauge through another sampling hole, the root short pipe, the sampling primary valve V3, the pressure guide pipe G2 and the sampling secondary valve V4, and the pressure value is only used as a primary indication on the site and does not participate in the control of the production process.
The pressure transmitter PB and the pressure gauge P, and the corresponding pipes and valves, as a whole, constitute a pressure detection sampling device (called pressure measurement loop for short).
According to the working principle of the pressure detection sampling device, the water pressure of the cooling water main pipeline is led to a pressure guide sampling pipeline (sampling pipeline for short) between a pressure transmitter and a pressure gauge and a medium (namely water) in accessories of the pressure guide sampling pipeline are not circulated, impurities deposited in the sampling pipeline for a long time form sludge and water scale, and finally the sampling pipeline is blocked.
After the sampling pipeline is blocked, the pressure of the cooling water main pipeline cannot be normally transmitted into the pressure transmitter and the pressure gauge; wherein, the sampling pipeline of the pressure transmitter is blocked, which causes that the pressure transmitter can not detect the correct water pressure signal of the cooling water main pipeline.
For example, the actual value of the water pressure in the main cooling water pipeline is normal, after the sampling pipeline is blocked, the detected water pressure value (referred to as the detected value for short) detected by the pressure transmitter is lower than the actual value, and when the wrong detected water pressure value is lower than the trip interlocking value set by the DCS control system, the DCS outputs a trip instruction, and the interlocking malfunction causes the trip of the compressor.
Similarly, when the actual water pressure in the cooling water main pipeline is lower than the normal set value and the detection value detected by the pressure transmitter is greater than the actual value of the water pressure in the cooling water main pipeline, the interlocking protection corresponding to the compressor is lost, and the compressor can cause equipment damage to the unit due to lack of cooling water.
Therefore, only if the pressure guide pipeline of the pressure transmitter is ensured to be smooth, the normal transmission of the pressure signal of the cooling water pipeline is ensured, the corresponding pressure measuring loop can normally work, and the real cooling water pressure value is detected.
In practical work, a water pressure measuring loop with the structural mode is arranged on a water supply pipeline of the intercooler circulating cooling water of the No. 1 nitrogen press of the applicant company, one pressure transmitter sends signals to a DCS control system of a control room, the other pressure meter is used for on-site indication, the water pressure value participates in the start preparation condition of the nitrogen press and the control of the safety interlocking protection tripping machine, and the start is allowed when the water pressure value is larger than 240kpa before the compressor is started. Under the operation state, the water pressure is less than 220kpa, a 'water pressure low light fault' alarm is sent out, a 'water pressure low heavy fault' signal is output when the water pressure is less than 200kpa, the compression stops operating by the interlocking trip signal, and the whole production process stops.
In the operation process of actual equipment, the alarm of ' water pressure low and light fault ' caused by cooling water is forced to stop, and the fault of ' interlocking ' trip ' caused by ' water pressure low and heavy fault ' occurs at times. And after-inspection, the faults of the water pressure detection loop are all faults, and the protection interlocking action is caused. The specific reason is that the root of a sampling pressure guide pipe of a pressure transmitter for detecting the water pressure is blocked, so that pressure transmission error is caused, and the fault of 'trip' (habitual name of shutdown) is caused.
The blocking period of the pressure guide pipe is not fixed and is influenced by various factors such as water quality and the like, and the nitrogen compressor equipment needs to be continuously produced and operated for a long time, namely, one annual maintenance period (namely, a system shutdown large maintenance period) of two years. Therefore, during the maintenance work by annual repair, the method of removing and discharging the discharge needle valve at the membrane box side of the pressure transmitter body is adopted, so that the water pressure in the pipeline is discharged and carries away the silt and dirt in the pressure guide pipe. However, all the dirt cannot be brought out due to low water pressure, the cleaning effect is limited, and the blockage of the pressure guide pipe can only be delayed.
Due to the long annual repair period required by production, the pressure guide pipe cannot be always kept smooth in each production operation period. And at other times, the nitrogen compressor is in a production running state, so that the pressure guide pipe of the pressure transmitter cannot be dredged in advance by adopting a reliable periodic preventive maintenance mode.
At present, except for a regular transmitter needle valve discharging mode during annual repair, after the pressure pipe of the transmitter is blocked and trips are caused each time, the normal work of a pressure transmitter detection loop can be recovered only by adopting a method of emergency dredging of the pressure pipe afterwards, and the pressure transmitter is started again after fault treatment is finished.
Because the cooling water trunk line buries in the trench, the connecting pipe root nozzle stub is installed on the cooling water trunk line in the trench, need close the water supply valve of cooling water trunk line before the mediation, cut off the water, after the drainage, overhaul constructor could get into in the trench, demolish the valve of sampling, use tools such as metal bar, needle, hammer to strike the connecting pipe nozzle stub inner wall that blocks up, mode such as chisel is dug is dredged, operational environment is poor, the working space is narrow, the mediation work degree of difficulty is high, the safety risk is big.
And once the 'trip' occurs, the safety production isolation measures before the emergency repair work is implemented are complex, water is cut off, isolation and branding are carried out, the're-service' procedure is handled after the emergency repair is finished, a large amount of time is occupied, and long-time shutdown loss is caused. And the mode of dredging after the accident can not avoid the occurrence of the trip fault, and can only be used as a remedial measure of a production type of rush repair and recovery.
The invention Chinese patent CN201210315882.1 discloses a disassembly-free online dredging device and a dredging method for a preconcentrator nozzle, which realize online cleaning of the nozzle by adding a cleaning device on a circulating pipeline according to the component characteristics of a nozzle blockage and dissolving solid in the blocked nozzle by utilizing the chemical reaction principle, realize disassembly-free cleaning of the preconcentrator nozzle and achieve the purpose of dredging the nozzle.
The invention patent CN200310123642.2 discloses a fluid conveying method for preventing scaling and blockage of pipelines, which adopts pulse type conveying fluid to realize that two pipelines are utilized to convey fluid once in one period, so that the two pipelines are switched periodically to work, thereby preventing the scaling of the pipe wall caused by impurity deposition in continuous work.
Chinese invention patent CN200910078436.1 discloses a method for controlling and preventing mushroom head gas flow, which accurately controls bottom blowing gas flow by adjusting production process parameters such as gas pressure, flow and the like, meets the blowing process requirements and realizes the prevention of blockage in the production process.
Obviously, none of the technical solutions disclosed in the above patent documents can solve the technical problem that the pressure tube of the cooling water main pipe can be on-line dredged and cleaned at any time on the premise of continuously and uninterruptedly detecting the pressure value data of the cooling water main pipe by the pressure transmitter.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-line dredging and anti-blocking method for a pressure guide pipe. It is on the pressure transmitter on original cooling water main pipe and the pressure pipe of manometer, add a set of two three solenoid valves, manual blow-down valve and corresponding communicating pipe, through the switching to relevant valve, the operation, under the prerequisite of guaranteeing pressure transmitter incessant on-line measuring cooling water main pipe pressure value data in succession, can carry out the on-line type to the pressure pipe of pressure transmitter and manometer at any time, clearance not shut down, the mediation, and can reliably prevent the jam of pressure pipe, can avoid equipment operation parameter's wrong report police, the emergence of fault of stopping by mistake.
The technical scheme of the invention is as follows: the method for online dredging and blockage prevention of the pressure guide pipe is provided, the pressure guide pipe is used for an online pressure detection device, one end of the pressure guide pipe is connected with a cooling water main pipeline through a primary valve, and the other end of the pressure guide pipe is connected with the online pressure detection device through a secondary valve; the pressure online detection device at least comprises a pressure transmitter for data remote transmission and a pressure gauge for field display; the method is characterized in that:
a first two-position three-way electromagnetic valve SV1 is arranged at the front end of a secondary valve V2 of a pressure transmitter pressure guide pipe G1;
common end COM of first two-position three-way solenoid valve SV11A secondary valve V2 connected with the pressure pipe of the pressure transmitter, and a normally open end NO of a first two-position three-way electromagnetic valve1And a common end COM of a second two-position three-way solenoid valve SV22Normally closed end NC of first two-position three-way electromagnetic valve1The front end of a secondary valve V4 of a pressure guide pipe G2 of the pressure gauge is connected;
a third two-position three-way electromagnetic valve SV3 is arranged at the front end of a pressure guide pipe secondary valve V4 of the pressure gauge, and the common end COM of the third two-position three-way electromagnetic valve3The front end of a secondary valve V4 of a pressure guide pipe G2 of the pressure gauge is connected;
normal open end NO of second two-position three-way solenoid valve SV22Is communicated with the atmosphere through a first manual valve V5;
normal open end NO of third two-position three-way solenoid valve SV33The valve is communicated with the atmosphere through a second manual valve V6;
normally closed end NC of second two-position three-way solenoid valve SV22And a normally closed end NC of a third two-position three-way solenoid valve SV33Connected to a source of compressed air;
a group of manual switch groups are arranged and used for respectively controlling the manual control action of each two-position three-way electromagnetic valve and enabling each two-position three-way electromagnetic valve to be controlled to automatically perform pulse type work;
1) the first two-position three-way solenoid valve SV1 is switched by power, and the normally closed end NC of the first two-position three-way solenoid valve SV11And a common terminal COM1Is normally open-ended NO1And a common terminal COM1The pressure of a pressure gage pressure guide pipe G2 passes through a normally closed end NC of a first two-position three-way solenoid valve SV11And a common terminal COM1The pressure transmitter is conducted to ensure that the pressure transmitter can work normally all the time;
2) closing the first manual valve V5;
3) the second two-position three-way solenoid valve SV2 enters a pulse type working mode state in a repeated power-on and power-off mode, and is in a power-on period with a normally closed end NC thereof2The connected external compressed air passes through the common end COM2The sampling pipe enters the pressure guide pipe G1 of the pressure transmitter, and takes away impurities such as silt, dirt and the like precipitated on the inner wall of the pipeline at the corresponding sampling root part through pulse type washing;
4) the pulse type working mode state of the second two-position three-way solenoid valve SV2 is finished, so that the second two-position three-way solenoid valve is powered off, and the normally closed end NC of the second two-position three-way solenoid valve is2And a common terminal COM2The external compressed air is cut off and stops entering a pressure guide pipe G1 of the pressure transmitter; meanwhile, the normally open end NO of the second two-position three-way solenoid valve SV22And a common terminal COM2Are conducted with each other; open and its normally open end NO2A first manual valve V5 connected; the water in the cooling water main pipeline passes through a primary valve V1, a pressure guide pipe G1 of a pressure transmitter and a common end COM of a second two-position three-way electromagnetic valve SV22Normally open end NO2And first manual valve V5 exhaust; checking whether the discharged water quantity is smooth or not and whether turbid impurities are carried out in the water or not;
if the water quantity and the water quality meet the requirements, closing the first manual valve V5 and carrying out the next step; if not, returning to the step 2) and repeating;
5) the first two-position three-way solenoid valve SV1 is de-energized and its normally open end NO1And a common terminal COM1The pressure transmitter is communicated with the cooling water main pipeline and recovers to the state that the pressure in the cooling water main pipeline is transmitted by the pressure guide pipe G1 of the pressure transmitter; meanwhile, the normally closed end NC of the first two-position three-way solenoid valve SV11And a common terminal COM1Is disconnected; the pressure guide pipe G2 of the pressure gauge and the pressure guide pipe G1 of the pressure transmitter work independently and return to the respective working modes of the pressure guide pipes;
6) closing the secondary valve V4 and the second manual valve V6 of the pressure gauge;
7) the third two-position three-way solenoid valve SV3 enters a pulse type working mode state in a repeated power-on and power-off mode, and a normally closed end NC of the third two-position three-way solenoid valve SV3 is in a power-on period3The connected compressed air passes through its common terminal COM3The sample enters the pressure guide pipe G2 of the pressure gauge, and takes away impurities such as silt, dirt and the like deposited on the inner wall of the pipeline at the corresponding sampling root through pulsating flushing;
8) the pulse type working mode state of the third two-position three-way electromagnetic valve SV3 is ended, so that the two-position three-way electromagnetic valves SV3 are powered off, and the normally closed end NC thereof is connected with the power supply3And a common terminal COM3The external compressed air is cut off and stops entering the pressure guide pipe G2; meanwhile, the normally open end NO of the third two-position three-way solenoid valve SV33And a common terminal COM3Are conducted with each other; normally open end NO of open and third two-position three-way solenoid valve SV33A second manual valve V6 connected; the water in the cooling water main pipeline passes through a primary valve V3, a pressure guide pipe G2 of a pressure gauge and a common end COM of a third two-position three-way electromagnetic valve SV33Normally open end NO3And second manual valve V6 exhaust; checking whether the discharged water quantity is smooth or not and whether turbid impurities are carried out in the water or not;
if the discharged water quantity and the water quality meet the requirements, closing the second manual valve V6 and entering the next step; if not, returning to the step 6) and repeating;
9) and opening a secondary valve V4 of the pressure gauge, and putting the pressure gauge into service.
Specifically, the online dredging and anti-blocking method for the pressure guide pipe comprises the step of cleaning and dredging the pressure guide pipe G1 of the pressure transmitter on the premise of confirming the conduction of the pressure guide pipe G2 and a primary valve V3 of a pressure gauge.
Further, the method for online dredging and anti-clogging of the pressure guide pipe comprises the steps of 6) to 9) when the pressure guide pipe G2 and the primary valve V3 of the pressure gauge cannot be confirmed to be conducted, and cleaning and dredging operations are carried out on the pressure guide pipe G2 of the pressure gauge; and then carrying out the operations of the steps 2) to 5), and cleaning and dredging the pressure guide pipe G1 of the pressure transmitter.
When each two-position three-way electromagnetic valve is electrified, the normally closed end NC of each two-position three-way electromagnetic valve is normally closediAnd a common terminal COMiAre conducted with each other; normally open end NO when power is lostiAnd a common terminal COMiAre conducted.
The compressed air source is a compressed air steel cylinder, a compressed air pump or a compressed air supply pipeline; the compressed air source and the normally closed end NC of the second two-position three-way electromagnetic valve2And a normally closed end NC of a third two-position three-way electromagnetic valve3And (4) connecting.
Specifically, the method for online dredging and anti-clogging of the pressure guide pipe is characterized in that impurities such as sludge and dirt precipitated on the inner wall of the sampling root pipeline, which are taken away by pulsating flushing, are flushed into the cooling water main pipeline through the corresponding primary valve V1 or V3.
Specifically, the air supply pressure of the compressed air source is higher than the water supply pressure in the cooling water main pipeline.
Furthermore, the online dredging and anti-blocking method for the pressure guide pipe is suitable for cleaning and dredging the pressure transmitter and the pressure guide pipe once in 6-8 months.
The online dredging and anti-blocking method for the pressure guide pipe can be used for cleaning and dredging the pressure guide pipe of the pressure transmitter and the pressure gauge on line and periodically, can reliably prevent the blockage of the pressure guide pipe, and avoids the occurrence of false alarm and false car-skipping faults of the operation parameters of equipment.
Compared with the prior art, the invention has the advantages that:
1. on the premise of ensuring that the pressure transmitter continuously and uninterruptedly detects the pressure value data of the main cooling water pipeline on line, the pressure transmitter and the pressure guide pipe of the pressure gauge can be cleaned and dredged at any time by controlling and operating the two-position three-way electromagnetic valve group;
2. the pressure transmitter and the pressure guide pipe of the pressure gauge are cleaned and dredged in time, so that the blockage of the pressure guide pipe can be reliably prevented, and the false alarm of the operation parameters of the equipment and the fault of the false parking can be avoided;
3. the whole operation purpose is clear, the operation process is simple, the operation result is convenient to observe, and the mutual connection relation of the related valve group devices is concise and easy to implement;
4. the technical scheme can be further expanded to other production equipment using circulating cooling water, and the device can be applied to occasions with cooling water pipeline pressure detection and has wide popularization value.
Drawings
FIG. 1 is a schematic process flow diagram of a nitrogen press;
FIG. 2 is a schematic view of a cooling water line pressure detection arrangement;
FIG. 3 is a schematic view of a pipeline for dredging and blocking the pressure pipe according to the present invention;
FIG. 4 is a schematic diagram of the solenoid valve switching control circuit of the present invention.
In the figure, PB is a pressure transmitter, V1 is a primary valve of the pressure transmitter, V2 is a secondary valve of the pressure transmitter, P is a pressure gauge, V3 is a primary valve of the pressure gauge, V4 is a secondary valve of the pressure gauge, SV1 is a first two-position three-way electromagnetic valve, V2 is a second two-position three-way electromagnetic valve, SV3 is a third two-position three-way electromagnetic valve, V5 is a first manual exhaust valve, and V6 is a second manual exhaust valve.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The pressure guide sampling pipeline is used for connecting circulating medium water in the industrial cooling water main pipeline to a pressure receiving diaphragm capsule of the pressure transmitter to play a role in guiding pressure and transmitting pressure, and water in the sampling pipeline is non-flowing 'dead water'. Therefore, impurities and dirt in the cooling water main pipe and the pressure guide pipe are easy to precipitate and accumulate into sludge, the sludge is gradually deposited in the short pipe between the sampling hole of the cooling water main pipe and the sampling primary valve, the sectional area of the inner diameter of the short pipe is gradually reduced, and the short pipe is only completely blocked.
After the pressure guide pipe blocks up, the actual pressure in the unable acceptable back cooling water trunk line of pressure transmitter pressurized bellows, moreover, along with compressor factory building internal environment temperature along with seasonal variation, when the room temperature is higher in the factory building, the temperature in the pressure guide pipeline rises between sampling primary valve to the pressure transmitter, and the volume of water slightly has the inflation, and a small amount of inflation can cause the pressure transmitter bellows to be towards forward displacement, and the detected value of changer is greater than the hydraulic actual value in the cooling water pipeline. When the room temperature is reduced, the water temperature in the pressure guide pipeline between the sampling primary valve and the pressure transmitter is reduced, the volume of water is shrunk, the diaphragm capsule of the pressure transmitter is displaced towards the negative direction, and the detection value of the transmitter is smaller than the actual value of the water pressure in the cooling water pipeline.
The technical scheme of the invention provides an online dredging and anti-clogging method for a pressure guide pipe, which is characterized in that a group of two-position three-way electromagnetic valve group and a corresponding manual valve are arranged in front of a gauge front valve (namely the secondary valve) of a pressure transmitter and a pressure gauge, and the pressure guide pipe of the pressure transmitter and the pressure gauge can be cleaned and dredged at any time on the premise of ensuring that the pressure transmitter continuously and uninterruptedly detects pressure value data of a main cooling water pipeline on line through the operation of the two-position three-way electromagnetic valve group and the manual valve, the blockage of the pressure guide pipe can be reliably prevented, and the occurrence of false alarm and false stop faults of equipment operation parameters can be avoided.
The pressure guide pipe in the technical scheme is used for the pressure online detection device, one end of the pressure guide pipe is connected with a cooling water main pipeline through a primary valve, and the other end of the pressure guide pipe is connected with the pressure online detection device through a secondary valve; the pressure on-line detection device at least comprises a pressure transmitter for data remote transmission and a pressure gauge for on-site display.
As shown in FIG. 3, the technical solution of the present invention is to arrange a secondary valve V2 at the front end (i.e. the inlet end of the valve, also called inlet end or inlet, the same below) of the pressure pipe G1 of the pressure transmitterA first two-position three-way solenoid valve SV 1; common end COM of first two-position three-way solenoid valve SV11The normally open end NO of the first two-position three-way electromagnetic valve is connected with the front end of a pressure guide pipe secondary valve V2 of the pressure transmitter1And a common end COM of a second two-position three-way solenoid valve SV22Normally closed end NC of first two-position three-way electromagnetic valve1The front end of a secondary valve V4 of a pressure guide pipe G2 is connected with the pressure.
A third two-position three-way electromagnetic valve SV3 is arranged at the front end of a pressure guide pipe secondary valve V4 of the pressure gauge; common end COM of third two-position three-way electromagnetic valve3The front end of a secondary valve V4 is connected with a pressure guide pipe G2 of a pressure gauge; normally open end NO of second two-position three-way electromagnetic valve2Is communicated with the atmosphere through a first manual valve V5; normally open end NO of third two-position three-way electromagnetic valve3The valve is communicated with the atmosphere through a second manual valve V6; normally closed end NC of second two-position three-way electromagnetic valve2And a normally closed end NC of a third two-position three-way electromagnetic valve3After being connected in parallel, the air conditioner is connected with a compressed air source;
as shown in fig. 4, in the technical solution of the present invention, a group of manual switch group control circuits is provided for respectively controlling manual operation of each two-position three-way electromagnetic valve and enabling each two-position three-way electromagnetic valve to be controlled to automatically perform pulse type operation.
According to the technical scheme, the pressure guide pipe of the pressure transmitter and the pressure guide pipe of the pressure gauge are cooperatively switched, three two-position three-way electromagnetic valves SV1, SV2 and SV3 and two manual discharge valves V5 and V6 are additionally arranged on the gauge side of the two pressure guide pipes, and continuous uninterrupted normal detection work of the pressure transmitter and cleaning and dredging of the pressure guide pipe of the transmitter and the pressure guide pipe of the pressure gauge are realized through switching of certain steps.
The technical scheme of the invention adopts the following pipeline connections:
a pressure guide pipe of a pressure gauge P is divided into one path to be connected to a normally closed NC of a first two-position three-way electromagnetic valve (electromagnetic valve for short, the same below) SV11The pressure pipe of the pressure transmitter PB is connected to the normally open end NO of the first solenoid valve SV11Common COM of SV11A secondary valve V2 connected to the transmitter outputs to the pressure transmitter.
The compressed air in the steel cylinder is used as a compressed air pressure source, the air pressure in the steel cylinder is about 10Mpa, the pressure is regulated to be between 600 and 800Kpa through a steel cylinder pressure reducing valve, and two paths are simultaneously output, wherein one path is connected to a normally closed end NC of a second electromagnetic valve SV22Normal open end NO of SV22A manual discharge valve V5 is connected and used for checking whether a pressure guide pipe of the pressure transmitter is unobstructed; common COM of SV22Normally open end NO with ligation incorporated into SV11In the front pressure guide pipeline.
The other output of the cylinder gas pressure reducing valve is connected to a normally closed end NC of a third solenoid valve SV33Normally open end NO of third solenoid valve SV33Is connected to a manual discharge valve V6 and is used for checking whether a pressure guide pipe of the pressure gauge is unobstructed or not; common COM of SV33The connection is merged into a pressure guide pipeline before the inlet of a secondary valve V4 of the pressure gauge.
When the two-position three-way electromagnetic valves SV1, SV2 and SV3 are electrified, the normally closed end NCiAnd a common terminal COMiAre conducted with each other; normally open end NO when power is lostiAnd a common terminal COMiAre conducted.
The cleaning and dredging steps and the method of the technical scheme of the invention comprise:
firstly, the pressure transmitter PB needs to continuously detect data in real time so as to prevent the interlocking action from being protected and the compressor from tripping. Therefore, the first solenoid valve SV1 is electrically switched by first switching the hand switch HS1 (shown in fig. 4) from the "normal" position to the "pressure gauge lead pipe" position, and the water pressure of the pressure gauge lead pipe G2 passes through the normally closed end NC of the first solenoid valve SV11And a common terminal COM1Is conducted into the pressure transmitter, and simultaneously, the normally open end NO of the first solenoid valve SV11And a common terminal COM1The pressure transmitter can work normally all the time by disconnecting the pressure transmitter.
Secondly, a manual switch HS2 is switched from a 'normal use' position to a 'flushing' position, a normally open contact of a relay R1 is closed, the solenoid valve SV2 is powered on for 10 seconds and then powered off for 10 seconds through program setting of a DCS pulse generation module, repeated pulse type (also called pulse type) work is carried out, and an NC (normally closed) end and a second solenoid valve SV2 are powered on during the power-on period2Connected steel cylinderGas (namely compressed air or a compressed gas source) enters a pressure guide pipe G1 of the original pressure transmitter, the pressure of the steel cylinder gas is 600-800 Kpa, the water pressure in the pressure guide pipe is 250Kpa, the pressure difference between the pressure guide pipe and the pressure guide pipe causes the steel cylinder gas to enter the pressure guide pipe, and impurities such as sludge and dirt precipitated on the inner wall of the sampling root pipeline are taken away by pulse type flushing. The cleaned and blown impurities enter the cooling water main pipe and return to the water tank of the cooling water tower of the circulating cooling water system through the return water main pipe together with the gas discharged from the steel cylinder, and the cleaned sludge impurities and the discharged steel cylinder gas cannot cause any influence on the whole cooling water system because the water tank is open to the atmosphere.
Thirdly, the manual switch HS2 is switched back to the 'normal use' position, the second electromagnetic valve SV2 is de-energized, and the normally closed end NC is connected with the second electromagnetic valve2And a common terminal COM2The steel cylinder gas is cut off and stops entering the pressure guide pipe; meanwhile, the normally open end NO of the second solenoid valve SV22And a common terminal COM2Is conducted with the normally open end NO of the second solenoid valve2The manual drain valve V5 of connection, the water in the cooling water main pipe is discharged, checks whether the discharged water volume is unobstructed, whether the aquatic still has the impurity of bringing out the muddy. And if the discharged water amount is small and turbid impurities exist in the water, the inner wall of the pressure guide pipe is adhered with silt and is not smooth enough, closing the manual discharge valve V5, and repeating the second step and the third step. Until the amount of water discharged by the manual drain valve V5 is sufficient and there is no longer any cloudy dirt in the water, the manual drain valve V5 is closed.
Fourthly, the manual switch HS1 is switched back to the 'common' position to lead the first solenoid valve SV1 to lose power, and the normal open end NO thereof1And a common terminal COM1The pressure transmitter returns to the own pressure guiding pipe G1 to guide and transmit the pressure. Meanwhile, the normally closed end NC of the first electromagnetic valve1And a common terminal COM2And when the pressure transmitter is disconnected, the pressure guide pipe G2 of the pressure gauge and the pressure guide pipe G1 of the pressure transmitter work independently, and the respective work of the pressure guide pipes is recovered.
Because the pressure gauge is only used as on-site indication, it does not use the function of signal transmission and does not participate in signal control. Therefore, in the cleaning and dredging process of the pressure guide pipe of the pressure gauge, the indicated value of the pressure gauge is abnormal and has no influence.
The secondary valve V4 of the pressure gauge is closed to prevent the overpressure of the pressure gauge from being damaged. The manual switch HS3 is switched from the 'normal use' position to the 'flushing' position, the normally open contact of the relay R2 is closed, the third electromagnetic valve SV3 is powered on for 10 seconds and then powered off for 10 seconds through the program setting of the DCS pulse generation module, repeated pulse type work is carried out, and the steel cylinder gas passes through the normally closed end NC (numerical control) end during the power on period of the third electromagnetic valve SV33Enter via its common terminal COM3And the water is output into a pressure guide pipe G2 of the pressure gauge, and impurities such as sludge and dirt precipitated on the inner wall of the pipeline at the root of the sample are washed away and taken away. The same removed impurities flow back to the cooling water tank to be precipitated at the bottom, and the steel cylinder gas enters the water tank to be discharged into the atmosphere.
Sixthly, the manual switch HS3 is switched back to the 'normal' position to ensure that the third electromagnetic valve SV3 is de-energized and the normal close end NC thereof3And a common terminal COM3The cylinder gas is cut off and stops entering the pressure guide pipe, and meanwhile, the normally open end NO of the third solenoid valve SV33And a common terminal COM3Are conducted with each other; normally open end NO of open and third solenoid valve3A manual drain valve V6 is connected to drain the water in the main cooling water pipeline; checking whether the discharged water quantity is smooth or not and whether turbid impurities are carried out in the water or not; if the amount of discharged water is small and turbid impurities still exist in the water, the manual discharge valve V6 is closed, and the fifth step and the sixth step are repeated. Until the manual drain valve V6 discharged sufficient water and no more turbid dirt was present in the water, the valve V6 was closed by manual drain. The secondary valve V4 of the pressure gauge P is opened, and the pressure gauge is put into service.
Since the drawings and labels shown in fig. 4 are standard in the art, the specific connection and operation of the switches and switching contacts, relays and corresponding contacts will be obvious to those skilled in the art without any difference, and thus will not be described herein.
Through the implementation of the technical scheme on the site, the occurrence of 'trip' faults of the 1# nitrogen press caused by the blockage of the pressure transmission pipe of the pressure transmitter is stopped and avoided, and the long-time shutdown loss caused by a large time period occupied by safety production isolation measures, water cut-off, isolation, plate hanging and're-service' procedures after the implementation of the emergency repair work after the 'trip' faults occur is saved.
Thirdly, setting a cleaning and dredging period:
the steel bottle compressed air is consumed for cleaning and dredging, waste is easily caused by frequent cleaning, the connecting pipe is not easily blocked due to untimely cleaning, the difficulty of cleaning and dredging on line is increased, and the difficulty is increased when the blocking time is longer.
Since the gradual sedimentation, accumulation, scaling and complete blockage of the sludge in the pressure guide pipe are dynamic processes, the processes are related to water quality, such as impurity content, turbidity, conductivity and other factors in water, and the water quality indexes are not constant, an optimal cleaning period before the pressure guide pipe is completely blocked is difficult to determine.
According to the frequency of emergency repair after the blockage in the past, it is reasonable to determine that the cleaning and dredging are carried out once in 6-8 months. During the period, a certain amount of sludge is deposited, the sludge is soft, and the deposited impurities can be effectively removed by flushing compressed air of the steel cylinder.
The cleaning and dredging period of the pressure guide pipe of the on-site pressure gauge is the same as that of the pressure transmitter, and the cleaning and dredging are needed at the same time. Although the pressure gauge does not participate in control and has no influence on production, the pressure transmitter can obtain a correct and smooth pressure transmission value before the pressure transmitter connecting pipe is cleared and dredged only by ensuring the smoothness of the pressure transmitter connecting pipe, and the pressure transmitter can realize the uninterrupted real-time online detection function.
The technical scheme of the invention not only can dredge the blocked pressure guide pipe, but also does not influence the online cleaning in the production state through the operation without stopping in advance, thereby effectively preventing the pressure guide pipe from being blocked. After the blockage occurs, the maintainers enter dangerous places such as ditches and other limited spaces to carry out rush repair to possibly occur safety accidents and harm to the human body by the severe environment are avoided.
The online cleaning and dredging method of the technical scheme of the invention has the main advantages of no production stop, time saving, high efficiency, no potential safety hazard and the like, and has the following main specific effects:
1) before the improvement: the machine must be stopped to dredge. The nitrogen compressor equipment needs long-term continuous production operation, and can only utilize annual repair downtime to carry out dredging and overhauling operation on the pressure transmitter pressure guide pipe.
After the improvement: can be dredged on line and monitored in real time. By adopting the technical scheme of the invention, the pressure transmitter can be ensured to continuously detect a correct numerical value on line in real time, and dirt on the inner wall of the pressure guide pipe is ensured to be cleaned under the condition that compressor equipment normally runs without stopping.
2) Before the improvement: preventive periodic management cannot be performed. During the maintenance operation period of annual repair, the method of removing and discharging the discharge needle valve at the side of the membrane box of the pressure transmitter body enables the water pressure in the pipeline to discharge and bring out silt and dirt in the pressure guide pipe, and the annual repair period is more than two years.
After the improvement: by adopting the technical scheme of the invention, preventive periodic management can be implemented. The cleaning and dredging can be determined once in 6-8 months. During the period, the sludge is deposited by a certain amount and is soft, and deposited impurities can be effectively removed by flushing compressed air of the steel cylinder.
3) Before the improvement: the effect of cleaning the dirt is poor. The method for removing and discharging the discharge needle valve at the membrane box side of the body of the pressure transmitter enables the water pressure in the pipeline to discharge silt and dirt brought out of the pressure guide pipe, but the effect is limited because the water pressure is low and all the dirt cannot be brought out, and the blockage of the pressure guide pipe can only be delayed.
After the improvement: by adopting the technical scheme of the invention, the sewage cleaning effect is good. And impurities such as sludge and dirt precipitated on the inner wall of the sampling root pipeline are taken away by pulse type scouring. And the cleaned and blown impurities and gas do not affect the whole cooling water system.
4) Before the improvement: the construction risk is higher. Before dredging, a water supply valve of a cooling water main pipeline needs to be closed to stop water and drain water, a sampling primary valve needs to be removed during dredging, and tools such as a metal rod, a needle, a hammer and the like are used for knocking, chiseling and the like the inner wall of the blocked pressure guide pipe short pipe to dredge. And the main cooling water pipeline is buried in the trench, so that the working environment of maintenance constructors is poor, the construction difficulty is high, the time is long, and the safety risk is higher.
After the improvement: by adopting the technical scheme of the invention, human intervention is not needed. The electromagnetic valve and the discharge valve are utilized, and the pressure transmitter is switched in certain steps, so that continuous and uninterrupted normal detection work of the pressure transmitter and cleaning and dredging of a transmitter pressure guide pipe and a pressure gauge pressure guide pipe are realized, and manual intervention is basically not needed. The safety accidents possibly caused by the operation in dangerous places and the harm of severe environment to human bodies are avoided.
5) Before the improvement: the rush-repair operation time is long. After the root of the pressure guide pipe is blocked, pressure transmission errors are caused, and the nitrogen compressor trips. The emergency repair work safety production isolation measures are complex after the fault occurs, water is cut off, isolation and branding are carried out, the emergency repair work is carried out again after the emergency repair is finished, a large amount of time is occupied, and long-time shutdown loss is caused.
After the improvement: the occurrence of fault first-aid repair can be avoided. By adopting the technical scheme of the invention, the pressure guide pipes of the transmitter and the pressure gauge can be cleaned and dredged periodically on line, the blockage of the pressure guide pipes can be reliably prevented, and the faults of false alarm of the running parameters of equipment and vehicle-jumping by mistake are correspondingly avoided.
According to the technical scheme, the two-position three-way electromagnetic valve group, the manual discharge valve and the corresponding communication pipeline are additionally arranged on the pressure transmitter on the original main cooling water pipeline and the pressure guide pipe of the pressure gauge, and on the premise of ensuring continuous and uninterrupted on-line detection of pressure value data by the pressure transmitter through a series of switching and operation of the related valves, the pressure transmitter and the pressure guide pipe of the pressure gauge can be cleaned and dredged on line without shutdown, the blockage of the pressure guide pipe can be reliably prevented, and the occurrence of false alarm and false car-jump faults of operation parameters of equipment is avoided.
The invention can be widely applied to the fields of operation maintenance and daily maintenance of pressure transmitting pipes of various pressure transmitters and pressure gauges.
Claims (9)
1. A pressure pipe is used for a pressure online detection device, one end of the pressure pipe is connected with a cooling water main pipeline through a primary valve, and the other end of the pressure pipe is connected with the pressure online detection device through a secondary valve; the pressure online detection device at least comprises a pressure transmitter for data remote transmission and a pressure gauge for field display; the method is characterized in that:
a first two-position three-way electromagnetic valve SV1 is arranged at the front end of a secondary valve V2 of a pressure transmitter pressure guide pipe G1;
common end COM of first two-position three-way solenoid valve SV11A secondary valve V2 connected with the pressure pipe of the pressure transmitter, and a normally open end NO of a first two-position three-way electromagnetic valve1And a common end COM of a second two-position three-way solenoid valve SV22Normally closed end NC of first two-position three-way electromagnetic valve1The front end of a secondary valve V4 of a pressure guide pipe G2 of the pressure gauge is connected;
a third two-position three-way electromagnetic valve SV3 is arranged at the front end of a pressure guide pipe secondary valve V4 of the pressure gauge, and the common end COM of the third two-position three-way electromagnetic valve3The front end of a secondary valve V4 of a pressure guide pipe G2 of the pressure gauge is connected;
normal open end NO of second two-position three-way solenoid valve SV22Is communicated with the atmosphere through a first manual valve V5;
normal open end NO of third two-position three-way solenoid valve SV33The valve is communicated with the atmosphere through a second manual valve V6;
normally closed end NC of second two-position three-way solenoid valve SV22And a normally closed end NC of a third two-position three-way solenoid valve SV33Connected to a source of compressed air;
a group of manual switch groups are arranged and used for respectively controlling the manual control action of each two-position three-way electromagnetic valve and enabling each two-position three-way electromagnetic valve to be controlled to automatically perform pulse type work;
1) the first two-position three-way solenoid valve SV1 is switched by power, and the normally closed end NC of the first two-position three-way solenoid valve SV11And a common terminal COM1Is normally open-ended NO1And a common terminal COM1The pressure of a pressure gage pressure guide pipe G2 passes through a normally closed end NC of a first two-position three-way solenoid valve SV11And a common terminal COM1The pressure transmitter is conducted to ensure that the pressure transmitter can work normally all the time;
2) closing the first manual valve V5;
3) the second two-position three-way solenoid valve SV2 enters a pulse type working mode state in a repeated power-on and power-off mode, and is in a power-on period with a normally closed end NC thereof2The connected external compressed air passes through the common end COM2The sampling pipe enters the pressure guide pipe G1 of the pressure transmitter, and takes away impurities such as silt, dirt and the like precipitated on the inner wall of the pipeline at the corresponding sampling root part through pulse type washing;
4) the pulse type working mode state of the second two-position three-way solenoid valve SV2 is finished, so that the second two-position three-way solenoid valve is powered off, and the normally closed end NC of the second two-position three-way solenoid valve is2And a common terminal COM2The external compressed air is cut off and stops entering a pressure guide pipe G1 of the pressure transmitter; meanwhile, the normally open end NO of the second two-position three-way solenoid valve SV22And a common terminal COM2Are conducted with each other; open and its normally open end NO2A first manual valve V5 connected; the water in the cooling water main pipeline passes through a primary valve V1, a pressure guide pipe G1 of a pressure transmitter and a common end COM of a second two-position three-way electromagnetic valve SV22Normally open end NO2And first manual valve V5 exhaust; checking whether the discharged water quantity is smooth or not and whether turbid impurities are carried out in the water or not;
if the water quantity and the water quality meet the requirements, closing the first manual valve V5 and carrying out the next step; if not, returning to the step 2) and repeating;
5) the first two-position three-way solenoid valve SV1 is de-energized and its normally open end NO1And a common terminal COM1The pressure transmitter is communicated with the cooling water main pipeline and recovers to the state that the pressure in the cooling water main pipeline is transmitted by the pressure guide pipe G1 of the pressure transmitter; meanwhile, the normally closed end NC of the first two-position three-way solenoid valve SV11And a common terminal COM1Is disconnected; the pressure guide pipe G2 of the pressure gauge and the pressure guide pipe G1 of the pressure transmitter work independently and return to the respective working modes of the pressure guide pipes;
6) closing the secondary valve V4 and the second manual valve V6 of the pressure gauge;
7) the third two-position three-way solenoid valve SV3 enters a pulse type working mode state in a repeated power-on and power-off mode, and a normally closed end NC of the third two-position three-way solenoid valve SV3 is in a power-on period3The connected compressed air passes through its common terminal COM3The sample enters the pressure guide pipe G2 of the pressure gauge, and takes away impurities such as silt, dirt and the like deposited on the inner wall of the pipeline at the corresponding sampling root through pulsating flushing;
8) the pulse type working mode state of the third two-position three-way electromagnetic valve SV3 is ended, so that the two-position three-way electromagnetic valves SV3 are powered off, and the normally closed end NC thereof is connected with the power supply3And a common terminal COM3The external compressed air is cut off and stops entering the pressure guide pipe G2; meanwhile, the normally open end NO of the third two-position three-way solenoid valve SV33And a common terminal COM3Are conducted with each other; normally open end NO of open and third two-position three-way solenoid valve SV33A second manual valve V6 connected; the water in the cooling water main pipeline passes through a primary valve V3, a pressure guide pipe G2 of a pressure gauge and a common end COM of a third two-position three-way electromagnetic valve SV33Normally open end NO3And second manual valve V6 exhaust; checking whether the discharged water quantity is smooth or not and whether turbid impurities are carried out in the water or not;
if the discharged water quantity and the water quality meet the requirements, closing the second manual valve V6 and entering the next step; if not, returning to the step 6) and repeating;
9) and opening a secondary valve V4 of the pressure gauge, and putting the pressure gauge into service.
2. The method for the online dredging and blockage prevention of the pressure guide pipe according to claim 1, which is characterized in that the method for the online dredging and blockage prevention of the pressure guide pipe comprises the step of cleaning and dredging the pressure guide pipe G1 of the pressure transmitter on the premise of confirming the conduction of the pressure guide pipe G2 and a primary valve V3 of a pressure gauge.
3. The method for the online dredging and blockage prevention of the pressure guide pipe according to claim 1, which is characterized in that when the conduction of the pressure guide pipe G2 and a primary valve V3 of a pressure gauge cannot be confirmed, the operation of the steps 6) to 9) is firstly carried out, and the pressure guide pipe G2 of the pressure gauge is cleaned and dredged; and then carrying out the operations of the steps 2) to 5), and cleaning and dredging the pressure guide pipe G1 of the pressure transmitter.
4. The method for on-line dredging and anti-clogging of the pressure guiding pipe according to claim 1, wherein when each two-position three-way electromagnetic valve is electrified, the normally closed end NC of the two-position three-way electromagnetic valve is closediAnd a common terminal COMiAre conducted with each other; normally open end NO when power is lostiAnd a common terminal COMiAre conducted.
5. The method for on-line dredging and blockage prevention of the pressure pipe according to claim 1, wherein the compressed air source is a compressed air steel cylinder, a compressed air pump or a compressed air supply pipeline; the compressed air source and the normally closed end NC of the second two-position three-way electromagnetic valve2And a normally closed end NC of a third two-position three-way electromagnetic valve3And (4) connecting.
6. The method for the online dredging and anti-clogging of the pressure guiding pipe according to claim 1, characterized in that the impurities such as silt, dirt and the like deposited on the inner wall of the sampling root pipeline, which are taken away by the pulsating washing, are washed into the main cooling water pipeline through the corresponding primary valve V1 or V3.
7. The method for on-line dredging and blockage prevention of the pressure guide pipe according to claim 1, wherein the air supply pressure of the compressed air source is higher than the water supply pressure in the cooling water main pipeline.
8. The method for the online dredging and blockage prevention of the pressure guide pipe according to claim 1, which is characterized in that the online dredging and blockage prevention method of the pressure guide pipe is used for cleaning and dredging the pressure transmitter and the pressure gauge pressure guide pipe once in 6-8 months.
9. The method for the online dredging and anti-clogging of the pressure guiding pipe according to claim 1, which is characterized in that the method for the online dredging and anti-clogging of the pressure guiding pipe can be used for cleaning and dredging the pressure guiding pipe of a pressure transmitter and a pressure gauge online and periodically, can reliably prevent the blockage of the pressure guiding pipe, and avoids the occurrence of false alarm and false trip fault of the operation parameters of equipment.
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