CN103760850A - Remote monitoring and non-manual control device and method for nitrogen making machine - Google Patents

Abstract

The invention relates to the technical field of nitrogen making devices, in particular to a remote monitoring and non-manual control device and method for a nitrogen making machine. The device comprises a network connection computer and a computer programming tool PLC system or a DCS programming tool, and is characterized in that one end of a filter on an air compression system A is connected with a main air pipeline on the rear portion of a dust filter in an air preprocessing system B through a pipeline and a valve, clean air is introduced to serve as a back flushing air source of the filter, the other end of the air compression system A is connected with one end of a butterfly valve on a water separation system I through a pipeline, each electric device is provided with a local start device and a remote start device, and continuous air supply of the devices is guaranteed by means of a PLC or DCS programming control system and a safety protection system. Compared with the prior art, the remote monitoring and non-manual control device and method have the advantages that full-automatic control is achieved, a nitrogen making device is monitored remotely and in real time through a network, safe and stable start, operation and stop of the device are guaranteed, a liquid nitrogen standby system is automatically started in abnormal situations, and continuous air supply is guaranteed.

Description

A kind of remote monitoring about nitrogen making machine and unwatched device and method

[technical field]

The present invention relates to equipment of making nitrogen technical field, specifically a kind of remote monitoring about nitrogen making machine and unwatched device and method.

[background technology]

Nitrogen making machine refers to take air as raw material, utilizes the method for physics, by pressure swing adsorption, oxygen wherein is separated with nitrogen and obtain the equipment of nitrogen.According to different principle, the nitrogen making machine of commercial Application can be divided into cryogenic air separation method, the empty point-score (PSA) of molecular sieve and the empty point-score of film.

Cryogenic air separation unit nitrogen processed is a kind of traditional method for preparing nitrogen, take air as raw material, through overcompression, purification, recycling heat interchange makes air liquefaction become liquid air, utilize the boiling point of liquid oxygen and liquid nitrogen different, by the rectifying of liquid air, make their separation obtain nitrogen, but the cryogenic air separation unit equipment of making nitrogen is complicated, floor area is large, capital cost is higher, equipment one-time investment is more, operating cost is higher, and aerogenesis is slow, and installation requirement is high, the cycle is longer, be applicable to large-scale industry nitrogen processed, and in, small-scale nitrogen processed just seems uneconomical.Film nitrogen production by air separation is to take air as raw material, under certain pressure condition, utilizing oxygen in film, to have different infiltration rates with gases of different nature such as nitrogen makes oxygen separated with nitrogen, compare it with other equipment of making nitrogen and have that structure is more simple, volume is less, without switch valve, maintenance still less, the advantage such as aerogenesis is fast, increase-volume is convenient, but compare price with the molecular sieve nitrogen production by air separation machine of same size, will exceed more than 15%, cost is higher.

Molecular sieve nitrogen production by air separation is to take air as raw material, using carbonaceous molecular sieve as adsorbent, use pressure-variable adsorption principle, utilize carbonaceous molecular sieve to make the nitrogen method separated with oxygen to the selective adsorption of oxygen and nitrogen, common name PSA nitrogen processed, compare with tradition nitrogen method processed, it has, and technological process is simple, automaticity is high, aerogenesis is fast, energy consumption is low, product purity can need to regulate according to user in a big way, the features such as convenient operating maintenance, operating cost is lower, device adaptability is stronger, are subject to being widely used of medium and small Zhi Dan enterprise.

Existing nitrogen control technology processed is just entered independently to control to single regulating loop, will between each regulating loop in package unit, organically not combine, do as a whole control, generally at device fitting, set up a pulpit, device starts needs site operation personnel to start on the spot air compressor machine, the systems such as rectification column, pass through manual shift, make the nitrogen product that unit normal run output are qualified, during manual shift, controlled quentity controlled variable need to be controlled personnel and judges by rule of thumb, be difficult to accurate control, thereby cause energy dissipation, a plurality of regulating loops are controlled separately in addition, control complicated, waste of manpower resource.

[summary of the invention]

The present invention adopts each regulating loop independently to control the technical matters that causes the energy and waste of human resource in order to solve nitrogen technology processed in prior art, provides a kind of and can show by network implementation remote monitoring and the unwatched device and method of the relevant nitrogen making machine of real-time remote monitoring.

To achieve these goals, invent a kind of remote monitoring about nitrogen making machine and unwatched device, comprise network connection computer and computer programming instrument PLC system or DCS programming tool, one end by the filtrator AF102 on air compression system A is connected the primary air pipeline after dust filter unit AF301 in air pretreatment system B with valve by pipeline, draw dry low-pressure air and do filtrator AF102 blowback source of the gas, the other end of air compression system A connects the butterfly valve V606A one end on water separating system I by pipeline, the outlet conduit of dust filter unit AF301 on air pretreatment system B connects the entrance point of the rectification column bottom in ice chest system F by the butterfly valve V612 on analyzer system C, cold angle stop valves V502 on the draft tube connection expander refrigeration system E of electric heater EH-301 on air pretreatment system B and tap one end of V503, butterfly valve V301 on air pretreatment system B is connected the butterfly valve V606B one end on water separating system I with V302 pipeline tap one end, the draft tube of air bladder joint valve V615 on analyzer system C connects the outlet pipe of the main heat exchanger E503 on ice chest system F, the upper outlet pipe of analyzer system C is provided with three channel gas source pipeline, one tunnel connects V327 one end on instrument electric-control system D source of the gas of heating, decompressor bearing gas and blanket gas use are done in stop valve V322 one end that one tunnel connects on instrument electric-control system D, one tunnel connects ball valve V626-3 one end and does instrument air, stop valve V626-2 on instrument electric-control system D connects low pressure buffer tank ST601 one end of product delivery system J and does standby meter source of the gas pipeline, pneumatic diaphragm control valve V504 on expander refrigeration system E and the tap one end between V505 connect the main heat exchanger E503 one end on ice chest system F, stop valve V509 on ice chest system F and V515 are connected on the non-return valve V03 and the pipeline between raffinate carburetor VAP-04 of the liquid nitrogen storage tank VIE-01A on product storage system G, pneumatic control valve V511 one end on ice chest system F connects the pneumatic diaphragm control valve V08 one end in product storage system G, butterfly valve V15 one end that the tap of air temperature type vaporizer VAP01 one end connects voltage-regulating system H forms, above-mentioned all electrical equipments are provided with on the spot and long-range two kinds of starter gears, by PLC or DCS programming Control system and safety system, guarantee that this installs uninterrupted air feed.

Described air compression system A top is connected filtrator AF101 and AF102 with valve by pipeline, air compression system A lower pipeline is provided with stop valve V602, stop valve V602 lower pipeline is provided with flow temperature Displaying Meter on the spot, in flow, control in instrument, temperature and control in instrument, PLC programming Control and control instrument, pneumatic diaphragm control valve, vent muffler, by air compressor machine, chilled water backwater, temperature, instrument, chilled water water inlet, sound suppressor and valve portion form described air compression system on the spot.

The outlet pipe of the dust filter unit of described air pretreatment system B is provided with instrument and middle control instrument on the spot, described middle control instrument signal line is provided with PLC programming Control, on the admission line of dust filter unit, two ends, left and right are connected to ball valve V314 and Pneumatic butterfly valve V309, two shunt circuits of ball valve V315 and Pneumatic butterfly valve V310, on two Pneumatic butterfly valves, be respectively equipped with three-way solenoid valve and PLC programming Control, described ball valve V314 is connected thermo-insulating pipe line and gas circuit butterfly valve V307 one end with Pneumatic butterfly valve V309 tap one end, the gas circuit butterfly valve V307 other end connects gas circuit butterfly valve V308 one end, the gas circuit butterfly valve V308 other end connects Pneumatic butterfly valve V310 one end by utilidor, and tap one end connects molecular sieve adsorber MS302 one end and ball valve V319B one end, the ball valve V319B other end connects variable valve V311 one end, the variable valve V311 other end connects ball valve V319 one end, the ball valve V319 other end connects Pneumatic butterfly valve V307 and thermo-insulating pipe line one end, and tap one end connects molecular sieve adsorber MS301 one end, on described Pneumatic butterfly valve V307 and V308 and variable valve V311, be respectively equipped with three-way solenoid valve and PLC programming Control, the other end of molecular sieve adsorber MS301 is connected to ball valve V318A successively by thermo-insulating pipe line or pipeline, Pneumatic butterfly valve V303 and V301, ball valve V312 one end, the other end of molecular sieve adsorber MS302 is connected to ball valve V318B Pneumatic butterfly valve V304 and V302 successively by thermo-insulating pipe line or pipeline, ball valve V313 one end, described ball valve V318A links together by pneumatic stopping valve V305 and V306 and the ball valve V318B other end, the other end of described Pneumatic butterfly valve V303 is connected with one end of Pneumatic butterfly valve V04, and tap one end is connected in order to emptying with the tap one end between pneumatic stopping valve and V306, described pneumatic stopping valve V305, V306 and Pneumatic butterfly valve V303, V304, V301, on V302, be respectively equipped with three-way solenoid valve and PLC programming Control, the other end and the Pneumatic butterfly valve V302 of described Pneumatic butterfly valve V301 are serially connected, described ball valve V312 and the other end of V313 are serially connected, and on tap one end, connect tap one end of Pneumatic butterfly valve V301 and V302, lower butterfly valve V606B one end connecting on water separating system I, and be provided with that temperature shows and PLC programming Control, described electric heater EH-301 is connected on the regeneration gas pipeline between two startup butterfly valve V307 and V308 by utilidor, the air pipe of two described molecular sieve adsorbers is provided with pressure display instrument table and PLC programming Control, the air inlet pipeline of two described molecular sieve adsorbers is provided with temperature and shows and PLC programming Control.

The inlet pipeline of pneumatic diaphragm control valve V615 on described analyzer system C is provided with instrument and middle control instrument on the spot, described middle control instrument is provided with PLC programming Control, the inlet pipeline of pneumatic diaphragm control valve V614 on analyzer system C is provided with instrument and middle control instrument on the spot, and the Pneumatic butterfly valve V628 on analyzer system C is provided with three-way solenoid valve and PLC programming Control.

The entrance point of the tracheae of heating in described instrument electric-control system D is provided with instrument and PLC programming Control on the spot, and the two-way pipeline of instrument electric-control system D bearing gas and blanket gas is also provided with instrument on the spot, is also provided with instrument on the spot on decompressor filtrator and spare gas tank.

Described expander refrigeration system E two-way turbo-expander ET501, ET502 outlet pipe are provided with PLC programming Control, and the filtrator pipeline of described turbo-expander is provided with gauge pressure on the spot and shows.

Described ice chest system F top is provided with main condenser evaporator E502, the top of main condenser evaporator E502 is provided with instrument temperature on the spot and shows and the control of middle control instrument, on rectification column C501 left part pipeline, be provided with main heat exchanger E503 and temperature and manometer, each road pipeline of described rectification column C501 connects air compressor machine Shang Ge road signal pipe line.

Liquid nitrogen storage tank VIE-01A right part surface in described product storage system G is provided with pressure liquid level Displaying Meter, liquid nitrogen storage tank VIE-01A lower left quarter is provided with air temperature type vaporizer VAP01 and the VAP02 that pipeline is connected with valve, liquid nitrogen storage tank right lower quadrant is provided with the raffinate carburetor VAP-04 that pipeline is connected with valve, and described product delivery system J is provided with the liquid demonstration of middle control instrument.

Described voltage-regulating system H is provided with and analyzes warning PLC programming Control and middle control metering device, and the compressor of described water separating system I is provided with manometer, and separator WS201 is provided with thermometric instrument.

A kind of about the remote monitoring of nitrogen making machine and the method for unwatched device, comprise network connection computer and PLC Program Appliance instrument, the method adopts the separated air of Deep Cooling Method, pressurized air enters rectification column after molecular sieve adsorber is removed foreign gas, through rectifying, in overhead product outlet, obtain product nitrogen gas at low temperatures, whole system is by air compression system, precooler, purifier, electric heater, expander refrigeration system, heat interchanger, rectification column equipment, transport and storage system, analyzer system, instrument electric control system forms, on the hardware of all electrical equipments of whole system, be all provided with on the spot and long-range two kinds of Starting mode, by programming Control system and the safety system of PLC formula DCS, the safety and stability that guarantees this device starts, operation and parking, once occur abnormal, automatically start liquid nitrogen back-up system, guarantee uninterrupted air feed, comprise the following steps:

A. ought run into various dangerous situations, in the time of need to stopping in emergency, can be by long-range or stop in emergency on the spot

Button stops equipment safety:

When emergency stop push button is pressed, system can produce following action: stop main air compressor machine, automatically cut off ice chest processing air, stop decompressor, stop precooler, stop purifier program, power failure well heater, close hold one's breath nitrogen output of products valve and liquid nitrogen product delivery valve, after device product delivery valve cuts out, sump pressure reduces (PIC611), back-up system changes according to sump pressure, automatically changes back-up system liquid nitrogen gasification supply valve V16 to maintain the pressure of PI611, guarantees uninterrupted air feed;

B. the control of air compressor machine

I. when opening while meeting the following conditions, air compressor machine allows to start: the signal that air compressor machine self comes allows to start, and the machine is ready for; Purifier is ready; Enter ice chest watertight aircase complete shut-down;

Ii. when there is following situation, air compressor machine can automatic stopping: the chain factor of air compressor machine self triggers jumps car; Nitrogen-making device emergency stop push button is pressed;

C. the control of precooler

I. precooler self, with temperature control system, can be controlled outlet temperature between 5～8 degree;

Ii. excessive when airload, precooler outlet temperature can raise, when higher than certain value (20 ℃), if continue operation, go down, can produce harm to rear system, now system can be stopped by automatic linkage ice chest, prevent that purifier from penetrating, the objectionable impurities such as moisture, carbon dioxide are brought ice chest into;

Iii. when airload is too low, precooler outlet temperature can be lower than 5 degree, if continue to reduce, airborne moisture has icing danger, and when temperature is spent lower than 2, now the system precooler that can automatically stop, restarts precooler when equitemperature gos up to spend to 5;

D. the control of purifier

I. the control of electric heater:

(1) in electric heater, heating wire divides three groups, normally uses two groups, and when precooler fault, adsorption cycle shortens to 4 hours, the 3rd group of heater strip that come into operation while simultaneously regenerating, and electric heater is controlled regeneration gas and is gone out electric heater temperature stabilization (180 degree);

(2) it is high high chain and regeneration gas flow is low chain that electric heater is established outlet temperature, prevents electric heater dry combustion method, and heating wire burns out;

Ii. the time sequential control of purifier

Totally 2 of purifier absorbing cylinders, an absorption, a regeneration, two are alternately cut off and use,--1 horn heating--1 horn cold blowing--all pressure-parallel connections--2 horn pressure releases--2 horn heating--, 2 horn cold blowings that adsorption cycle divides 4 hours periods (without precooler operating mode) and 8 hours (having precooler operating mode) according to the situation of precooler, and absorption hockets according to following steps: all press--1 horn pressure release in parallel;

Iii. purifier entry condition: compressor operation, precooler outlet temperature does not reach high value (20 ℃)

Iv. regeneration gas flow is controlled

(1) regeneration gas flow is controlled by PIC-603, and it is disposed to sound suppressor SL-301 by unnecessary regeneration gas;

(2) this controller is relevant to molecular sieve step order, when heating starts and cold blowing finishes, can cause that the play of regeneration gas demand changes greatly, when molecular sieve correlation step (heating and prepare pressurising) starts, molecular sieve sequence controller presets V628(PIC603) aperture, when heating starts, force output valve position signal to 20% then to get back to automatic mode; Preparing to force output valve position signal to 75% then to get back to automatic mode when pressurising starts;

E. the control of ice chest

I. the parking of ice chest

(1) when there is following situations, ice chest meeting automatic stopping: air compressor machine is let out and carried or stop; V612 closes; Purifier outlet temperature is higher than 60 ℃; Purifier top hole pressure lower than the cold liquid level of 5bar master lower than 20%; The time delay of purifier sequence was over 75 minutes;

(2) ice chest produces following action after stopping: V612 solenoid valve dead electricity is closed, V601 standard-sized sheet, FIC604-1 and FIC604-2 force manually output 0, complete shut-down V614, V615, complete shut-down expander inlet valve V504, V505, stop decompressor, close liquid air throttling valve V510, standard-sized sheet regeneration gas by-pass valve V325, decompressor by-pass valve V501 forces manual-lock, complete shut-down tapping valve V18, regeneration gas atmospheric valve V628 forces to beat automatically, complete shut-down liquid nitrogen delivery valve V511, liquid nitrogen container admission valve V08A, opens liquid nitrogen bleed valve V09A;

Ii. ice chest allows entry condition: at the bottom of rectification column, liquid level is not higher than 75%; Main cold liquid level is not higher than 90%;

F. the control of turbo-expander

I. decompressor stops chain

(1) cause the reason of decompressor jumping car: decompressor rotating speed high (SIACS501/502); Bearing atmospheric pressure low (PIAS401/402); HIC612 closes (ice chest parking);

(2) decompressor moves after jumping car: close admission valve V504/V505, stop decompressor;

Ii. expander inlet valve is controlled

Expander inlet valve is by leading cold liquid level (LIAC502-1) and the low selected control system of decompressor rotating speed (SIACS501/502);

Iii. decompressor by-pass valve is controlled

Decompressor by-pass valve is controlled by main cold pressure PI506, pressure Gao Kai great, on the contrary turn down;

G. the control of rectification column

I. according to the extraction ratio of product nitrogen, set empty nitrogen ratio, enter the ratio of tower air capacity and product nitrogen, when air compressor machine electric current is when TV university allows working current following, device operates under output restriction mode, according to client's Determination of quantity nitrogen output, according to output, adjusts air compressor machine load; When current of electric has reached maximum while allowing working current, device is transformed under motor restriction mode, air compressor machine enter that tower air capacity is come and empty nitrogen recently determining device output is big or small; Output setting value upper and lower limit is meanwhile set;

Ii. enter tower air capacity closely bound up with device cold, cold enters tower air capacity more to be increased, otherwise, air capacity reduces, the control of nitrogen-making device cold is adjusted in coming by decompressor payload and liquid nitrogen product withdrawal amount, decompressor is generally used for the large cold balancing of integral body to adjust, and the reacting condition that small cold variation can hinder by tower out, takes out valve adjustment by liquid nitrogen product;

Iii. according to main cold liquid level, rise or downtrending come judgment means cold number, main cold liquid level rises, and illustrate that cold is many, need to close decompressor, main cold liquid level decline illustrates that cold is few, need to drive decompressor;

Iv. decompressor load arranges the upper limit, prevents decompressor hypervelocity;

V. decompressor load arranges lower limit, prevents because of main cold liquid level response lag, causes decompressor overshoot and to affect empty divided working status disorderly;

Vi. tower hinders when high, illustrates that cold is many, opens large liquid nitrogen and takes out valve, increases cold and externally exports;

Vii. tower hinders when low, illustrates that cold is few, turns down liquid nitrogen and takes out valve, reduces cold and externally exports;

Viii. gas nitrogen output of products is controlled automatically according to flow, and flow setting value calculates according to empty nitrogen ratio by processing air capacity, and automatic assignment is to flow controller;

Ix. descend tower liquid level to control according to liquid air throttling;

X. product purity adopts two analyser monitorings, any analyser detects product quality and exceeds standard, and automatically cuts off the output of gas and fluid product, automatically starts back-up system, guarantee that for the nitrogen quality toward client's pipe network be qualified, and be continuously unbroken;

H. the control of product

I. gas nitrogen product flow is controlled

Product valve V615 is by flowmeter FIC604-V615 and the low selected control system of pressure controller PIC605, and product atmospheric valve V614 is controlled by FIC604-614, and the setting value of FIC604-V614 is less by 10% than the setting value of FIC604-V615;

Ii. gas nitrogen product purity analysis and Control

When product purity AIAS-601A or AIAS602 purity oxygen content are when high, move as follows: close the nitrogen product valve V615 that holds one's breath, open gas nitrogen product atmospheric valve V614, preset opening value (60%) is then got back to automatically, open solenoid valve V638(after nitrogen product purity is qualified, nitrogen product valve V615 opens, V638 postpones to close after 30s again), close liquid nitrogen product valve V511, put manually, close liquid nitrogen and go storage tank valve V08A(operator hand-reset on PLC), open liquid nitrogen blow down valve V09A(operator hand-reset on PLC);

Iii. gas nitrogen product temperature is controlled

When gas nitrogen product temperature TIAS-604 temperature is low, move as follows: close nitrogen product valve V615, close nitrogen atmospheric valve V614;

Iv. liquid nitrogen product valve is controlled

(1) lead cold liquid level LIACS-502 and increase, open large V511; Otherwise, turn down; It is large that PDIAC-501 resistance becomes, and opens large V511; Otherwise, turn down, when LIACS-502 controls together with PDIAC-501, V511 aperture between carries out low choosing, and V511 aperture arranges the upper limit, and higher limit can be rewritten, and prevents that liquid nitrogen withdrawal amount is excessive, causes operating mode out of control;

(2) when the liquid level LIAS-1801A of liquid nitrogen storage tank is high (97%), automatically close liquid nitrogen product valve V511;

(3), when pressure tower and wet tank pressure difference value are less than 0.2Bar instantly, automatically close liquid nitrogen product valve V511;

V. analyser cabinet purge solenoid valve is controlled:

AIAS-601A>9PPM, open protection pneumoelectric magnet valve, simultaneously: close nitrogen product valve V615, close liquid nitrogen product valve V511, close liquid nitrogen and go storage tank valve V08A(operator manual unlocking on PLC), open liquid nitrogen blow down valve V09(operator manual unlocking on PLC);

I. back-up system is controlled

When device causes output of products valve V615 to close because a variety of causes is chain, pipe network gas tank pressure P IC611 can reduce, the liquid nitrogen that now back-up system is stored is after gasifier is gasificated into, by V16 valve automatic makeup, be charged to pipe network, to guarantee uninterrupted air feed, be that sump pressure PIC611 controls V16 valve events, when pressure is low, drive large this valve; Otherwise turn down.

The present invention compared with the existing technology, its advantage is: Automatic Control, by network implementation, show the real-time remote monitoring equipment of making nitrogen, all electrical equipments have all configured on the spot and long-range two kinds of Starting mode from hardware, by advanced control system and safety system, the safety and stability of assurance device starts, moves and stops; When abnormal conditions, automatically start liquid nitrogen back-up system, guarantee uninterrupted air feed, control simple, saving cost.

[accompanying drawing explanation]

Fig. 1 is schematic diagram of the present invention;

Fig. 2 is the concrete schematic diagram of air compression system A of the present invention;

Fig. 3 is the concrete schematic diagram of air pretreatment system B of the present invention;

Fig. 4 is the concrete schematic diagram of analyzer system C of the present invention;

Fig. 5 is the concrete schematic diagram of instrument electric-control system D of the present invention;

Fig. 6 is the concrete schematic diagram of expander refrigeration system E of the present invention;

Fig. 7 is the concrete schematic diagram of ice chest system F of the present invention;

Fig. 8 is the concrete schematic diagram of product storage system G of the present invention;

Fig. 9 is the concrete schematic diagram of voltage-regulating system H of the present invention;

Figure 10 is the concrete schematic diagram of water separating system I of the present invention;

Figure 11 is the concrete schematic diagram of product delivery system J of the present invention;

Specify Fig. 1 as Figure of abstract of the present invention.

[embodiment]

Below in conjunction with accompanying drawing, the invention will be further described, and the structure of this device and principle are very clearly concerning this professional people.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

Embodiment 1

As shown in Figure 1 to 11, a kind of remote monitoring about nitrogen making machine and unwatched device, comprise network connection computer and computer programming instrument PLC system or DCS programming tool, one end by the filtrator AF102 on air compression system A is connected the primary air pipeline after dust filter unit AF301 in air pretreatment system B with valve by pipeline, draw dry low-pressure air and do filtrator AF102 blowback source of the gas, the other end of air compression system A connects the butterfly valve V606A one end on water separating system I by pipeline, the outlet conduit of dust filter unit AF301 on air pretreatment system B connects the entrance point of the rectification column bottom in ice chest system F by the butterfly valve V612 on analyzer system C, cold angle stop valves V502 on the draft tube connection expander refrigeration system E of electric heater EH-301 on air pretreatment system B and tap one end of V503, butterfly valve V301 on air pretreatment system B is connected the butterfly valve V606B one end on water separating system I with V302 pipeline tap one end, the draft tube of air bladder joint valve V615 on analyzer system C connects the outlet pipe of the main heat exchanger E503 on ice chest system F, the upper outlet pipe of analyzer system C is provided with three channel gas source pipeline, one tunnel connects V327 one end on instrument electric-control system D source of the gas of heating, decompressor bearing gas and blanket gas use are done in stop valve V322 one end that one tunnel connects on instrument electric-control system D, one tunnel connects ball valve V626-3 one end and does instrument air, stop valve V626-2 on instrument electric-control system D connects low pressure buffer tank ST601 one end of product delivery system J and does standby meter source of the gas pipeline, pneumatic diaphragm control valve V504 on expander refrigeration system E and the tap one end between V505 connect the main heat exchanger E503 one end on ice chest system F, stop valve V509 on ice chest system F and V515 are connected on the non-return valve V03 and the pipeline between raffinate carburetor VAP-04 of the liquid nitrogen storage tank VIE-01A on product storage system G, pneumatic control valve V511 one end on ice chest system F connects the pneumatic diaphragm control valve V08 one end in product storage system G, butterfly valve V15 one end that the tap of air temperature type vaporizer VAP01 one end connects voltage-regulating system H forms, above-mentioned all electrical equipments are provided with on the spot and long-range two kinds of starter gears, by PLC or DCS programming Control system and safety system, guarantee that this installs uninterrupted air feed.

Embodiment 2

A kind of about the remote monitoring of nitrogen making machine and the method for unwatched device, comprise network connection computer and PLC Program Appliance instrument, the method adopts the separated air of Deep Cooling Method, pressurized air enters rectification column after molecular sieve adsorber is removed foreign gas, through rectifying, in overhead product outlet, obtain product nitrogen gas at low temperatures, whole system is by air compression system, precooler, purifier, electric heater, expander refrigeration system, heat interchanger, rectification column equipment, transport and storage system, analyzer system, instrument electric control system forms, on the hardware of all electrical equipments of whole system, be all provided with on the spot and long-range two kinds of Starting mode, by programming Control system and the safety system of PLC formula DCS, the safety and stability that guarantees this device starts, operation and parking, once occur abnormal, automatically start liquid nitrogen back-up system, guarantee uninterrupted air feed, comprise the following steps:

J. ought run into various dangerous situations, in the time of need to stopping in emergency, can be by long-range or stop in emergency on the spot

Button stops equipment safety:

When emergency stop push button is pressed, system can produce following action: stop main air compressor machine, automatically cut off ice chest processing air, stop decompressor, stop precooler, stop purifier program, power failure well heater, close hold one's breath nitrogen output of products valve and liquid nitrogen product delivery valve, after device product delivery valve cuts out, sump pressure reduces (PIC611), back-up system changes according to sump pressure, automatically changes back-up system liquid nitrogen gasification supply valve V16 to maintain the pressure of PI611, guarantees uninterrupted air feed;

K. the control of air compressor machine

Iii. when opening while meeting the following conditions, air compressor machine allows to start: the signal that air compressor machine self comes allows to start, and the machine is ready for; Purifier is ready; Enter ice chest watertight aircase complete shut-down;

Iv. when there is following situation, air compressor machine can automatic stopping: the chain factor of air compressor machine self triggers jumps car; Nitrogen-making device emergency stop push button is pressed;

L. the control of precooler

Iv. precooler self, with temperature control system, can be controlled outlet temperature between 5～8 degree;

V. excessive when airload, precooler outlet temperature can raise, when higher than certain value (20 ℃), if continue operation, go down, can produce harm to rear system, now system can be stopped by automatic linkage ice chest, prevent that purifier from penetrating, the objectionable impurities such as moisture, carbon dioxide are brought ice chest into;

Vi. when airload is too low, precooler outlet temperature can be lower than 5 degree, if continue to reduce, airborne moisture has icing danger, and when temperature is spent lower than 2, now the system precooler that can automatically stop, restarts precooler when equitemperature gos up to spend to 5;

M. the control of purifier

V. the control of electric heater:

(3) in electric heater, heating wire divides three groups, normally uses two groups, and when precooler fault, adsorption cycle shortens to 4 hours, the 3rd group of heater strip that come into operation while simultaneously regenerating, and electric heater is controlled regeneration gas and is gone out electric heater temperature stabilization (180 degree);

(4) it is high high chain and regeneration gas flow is low chain that electric heater is established outlet temperature, prevents electric heater dry combustion method, and heating wire burns out;

Vi. the time sequential control of purifier

Totally 2 of purifier absorbing cylinders, an absorption, a regeneration, two are alternately cut off and use,--1 horn heating--1 horn cold blowing--all pressure-parallel connections--2 horn pressure releases--2 horn heating--, 2 horn cold blowings that adsorption cycle divides 4 hours periods (without precooler operating mode) and 8 hours (having precooler operating mode) according to the situation of precooler, and absorption hockets according to following steps: all press--1 horn pressure release in parallel;

Vii. purifier entry condition: compressor operation, precooler outlet temperature does not reach high value (20 ℃)

Viii. regeneration gas flow is controlled

(3) regeneration gas flow is controlled by PIC-603, and it is disposed to sound suppressor SL-301 by unnecessary regeneration gas;

(4) this controller is relevant to molecular sieve step order, when heating starts and cold blowing finishes, can cause that the play of regeneration gas demand changes greatly, when molecular sieve correlation step (heating and prepare pressurising) starts, molecular sieve sequence controller presets V628(PIC603) aperture, when heating starts, force output valve position signal to 20% then to get back to automatic mode; Preparing to force output valve position signal to 75% then to get back to automatic mode when pressurising starts;

N. the control of ice chest

Iii. the parking of ice chest

(3) when there is following situations, ice chest meeting automatic stopping: air compressor machine is let out and carried or stop; V612 closes; Purifier outlet temperature is higher than 60 ℃; Purifier top hole pressure lower than the cold liquid level of 5bar master lower than 20%; The time delay of purifier sequence was over 75 minutes;

(4) ice chest produces following action after stopping: V612 solenoid valve dead electricity is closed, V601 standard-sized sheet, FIC604-1 and FIC604-2 force manually output 0, complete shut-down V614, V615, complete shut-down expander inlet valve V504, V505, stop decompressor, close liquid air throttling valve V510, standard-sized sheet regeneration gas by-pass valve V325, decompressor by-pass valve V501 forces manual-lock, complete shut-down tapping valve V18, regeneration gas atmospheric valve V628 forces to beat automatically, complete shut-down liquid nitrogen delivery valve V511, liquid nitrogen container admission valve V08A, opens liquid nitrogen bleed valve V09A;

Iv. ice chest allows entry condition: at the bottom of rectification column, liquid level is not higher than 75%; Main cold liquid level is not higher than 90%;

O. the control of turbo-expander

Iv. decompressor stops chain

(3) cause the reason of decompressor jumping car: decompressor rotating speed high (SIACS501/502); Bearing atmospheric pressure low (PIAS401/402); HIC612 closes (ice chest parking);

(4) decompressor moves after jumping car: close admission valve V504/V505, stop decompressor;

V. expander inlet valve is controlled

Expander inlet valve is by leading cold liquid level (LIAC502-1) and the low selected control system of decompressor rotating speed (SIACS501/502);

Vi. decompressor by-pass valve is controlled

Decompressor by-pass valve is controlled by main cold pressure PI506, pressure Gao Kai great, on the contrary turn down;

P. the control of rectification column

Xi. according to the extraction ratio of product nitrogen, set empty nitrogen ratio, enter the ratio of tower air capacity and product nitrogen, when air compressor machine electric current is when TV university allows working current following, device operates under output restriction mode, according to client's Determination of quantity nitrogen output, according to output, adjusts air compressor machine load; When current of electric has reached maximum while allowing working current, device is transformed under motor restriction mode, air compressor machine enter that tower air capacity is come and empty nitrogen recently determining device output is big or small; Output setting value upper and lower limit is meanwhile set;

Xii. enter tower air capacity closely bound up with device cold, cold enters tower air capacity more to be increased, otherwise, air capacity reduces, the control of nitrogen-making device cold is adjusted in coming by decompressor payload and liquid nitrogen product withdrawal amount, decompressor is generally used for the large cold balancing of integral body to adjust, and the reacting condition that small cold variation can hinder by tower out, takes out valve adjustment by liquid nitrogen product;

Xiii. according to main cold liquid level, rise or downtrending come judgment means cold number, main cold liquid level rises, and illustrate that cold is many, need to close decompressor, main cold liquid level decline illustrates that cold is few, need to drive decompressor;

Xiv. decompressor load arranges the upper limit, prevents decompressor hypervelocity;

Xv. decompressor load arranges lower limit, prevents because of main cold liquid level response lag, causes decompressor overshoot and to affect empty divided working status disorderly;

Xvi. tower hinders when high, illustrates that cold is many, opens large liquid nitrogen and takes out valve, increases cold and externally exports;

Xvii. tower hinders when low, illustrates that cold is few, turns down liquid nitrogen and takes out valve, reduces cold and externally exports;

Xviii. gas nitrogen output of products is controlled automatically according to flow, and flow setting value calculates according to empty nitrogen ratio by processing air capacity, and automatic assignment is to flow controller;

Xix. descend tower liquid level to control according to liquid air throttling;

Xx. product purity adopts two analyser monitorings, any analyser detects product quality and exceeds standard, and automatically cuts off the output of gas and fluid product, automatically starts back-up system, guarantee that for the nitrogen quality toward client's pipe network be qualified, and be continuously unbroken;

Q. the control of product

Vi. gas nitrogen product flow is controlled

Product valve V615 is by flowmeter FIC604-V615 and the low selected control system of pressure controller PIC605, and product atmospheric valve V614 is controlled by FIC604-614, and the setting value of FIC604-V614 is less by 10% than the setting value of FIC604-V615;

Vii. gas nitrogen product purity analysis and Control

When product purity AIAS-601A or AIAS602 purity oxygen content are when high, move as follows: close the nitrogen product valve V615 that holds one's breath, open gas nitrogen product atmospheric valve V614, preset opening value (60%) is then got back to automatically, open solenoid valve V638(after nitrogen product purity is qualified, nitrogen product valve V615 opens, V638 postpones to close after 30s again), close liquid nitrogen product valve V511, put manually, close liquid nitrogen and go storage tank valve V08A(operator hand-reset on PLC), open liquid nitrogen blow down valve V09A(operator hand-reset on PLC);

Viii. gas nitrogen product temperature is controlled

When gas nitrogen product temperature TIAS-604 temperature is low, move as follows: close nitrogen product valve V615, close nitrogen atmospheric valve V614;

Ix. liquid nitrogen product valve is controlled

(4) lead cold liquid level LIACS-502 and increase, open large V511; Otherwise, turn down; It is large that PDIAC-501 resistance becomes, and opens large V511; Otherwise, turn down, when LIACS-502 controls together with PDIAC-501, V511 aperture between carries out low choosing, and V511 aperture arranges the upper limit, and higher limit can be rewritten, and prevents that liquid nitrogen withdrawal amount is excessive, causes operating mode out of control;

(5) when the liquid level LIAS-1801A of liquid nitrogen storage tank is high (97%), automatically close liquid nitrogen product valve V511;

(6), when pressure tower and wet tank pressure difference value are less than 0.2Bar instantly, automatically close liquid nitrogen product valve V511;

X. analyser cabinet purge solenoid valve is controlled:

AIAS-601A>9PPM, open protection pneumoelectric magnet valve, simultaneously: close nitrogen product valve V615, close liquid nitrogen product valve V511, close liquid nitrogen and go storage tank valve V08A(operator manual unlocking on PLC), open liquid nitrogen blow down valve V09(operator manual unlocking on PLC);

R. back-up system is controlled

When device causes output of products valve V615 to close because a variety of causes is chain, pipe network gas tank pressure P IC611 can reduce, the liquid nitrogen that now back-up system is stored is after gasifier is gasificated into, by V16 valve automatic makeup, be charged to pipe network, to guarantee uninterrupted air feed, be that sump pressure PIC611 controls V16 valve events, when pressure is low, drive large this valve; Otherwise turn down.

Claims (10)

1. the remote monitoring of a relevant nitrogen making machine and unwatched device, comprise network connection computer and computer programming instrument PLC system or DCS programming tool, it is characterized in that by pipeline, being connected the primary air pipeline after dust filter unit AF301 in air pretreatment system (B) with valve by the one end of the filtrator AF102 on air compression system (A), draw dry low-pressure air and do filtrator AF102 blowback source of the gas, the other end of air compression system (A) connects the butterfly valve V606A one end on water separating system (I) by pipeline, the outlet conduit of dust filter unit AF301 on air pretreatment system (B) connects the entrance point of the rectification column bottom in ice chest system (F) by the butterfly valve V612 on analyzer system (C), cold angle stop valves V502 in the draft tube connection expander refrigeration system (E) of electric heater EH-301 on air pretreatment system (B) and tap one end of V503, butterfly valve V301 on air pretreatment system (B) is connected the butterfly valve V606B one end on water separating system (I) with V302 pipeline tap one end, the draft tube of air bladder joint valve V615 on analyzer system (C) connects the outlet pipe of the main heat exchanger E503 in ice chest system (F), the upper outlet pipe of analyzer system (C) is provided with three channel gas source pipeline, one tunnel connects V327 one end on instrument electric-control system (D) source of the gas of heating, decompressor bearing gas and blanket gas use are done in stop valve V322 one end that one tunnel connects on instrument electric-control system (D), one tunnel connects ball valve V626-3 one end and does instrument air, stop valve V626-2 on instrument electric-control system (D) connects low pressure buffer tank ST601 one end of product delivery system (J) and does standby meter source of the gas pipeline, pneumatic diaphragm control valve V504 in expander refrigeration system (E) and the tap one end between V505 connect the main heat exchanger E503 one end in ice chest system (F), stop valve V509 in ice chest system (F) and V515 are connected on the non-return valve V03 and the pipeline between raffinate carburetor VAP-04 of the liquid nitrogen storage tank VIE-01A on product storage system (G), pneumatic control valve V511 one end in ice chest system (F) connects the pneumatic diaphragm control valve V08 one end in product storage system (G), butterfly valve V15 one end that the tap of air temperature type vaporizer VAP01 one end connects voltage-regulating system (H) forms, above-mentioned all electrical equipments are provided with on the spot and long-range two kinds of starter gears, by PLC or DCS programming Control system and safety system, guarantee that this installs uninterrupted air feed.

2. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, it is characterized in that described air compression system (A) top is connected filtrator AF101 and AF102 with valve by pipeline, air compression system (A) lower pipeline is provided with stop valve V602, stop valve V602 lower pipeline is provided with flow temperature Displaying Meter on the spot, in flow, control instrument, in temperature, control instrument, in PLC programming Control, control instrument, pneumatic diaphragm control valve, vent muffler, described air compression system is by air compressor machine, chilled water backwater, temperature is instrument on the spot, chilled water water inlet, sound suppressor and valve portion form.

3. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, the outlet pipe that it is characterized in that the dust filter unit of described air pretreatment system (B) is provided with instrument and middle control instrument on the spot, described middle control instrument signal line is provided with PLC programming Control, on the admission line of dust filter unit, two ends, left and right are connected to ball valve V314 and Pneumatic butterfly valve V309, two shunt circuits of ball valve V315 and Pneumatic butterfly valve V310, on two Pneumatic butterfly valves, be respectively equipped with three-way solenoid valve and PLC programming Control, described ball valve V314 is connected thermo-insulating pipe line and gas circuit butterfly valve V307 one end with Pneumatic butterfly valve V309 tap one end, the gas circuit butterfly valve V307 other end connects gas circuit butterfly valve V308 one end, the gas circuit butterfly valve V308 other end connects Pneumatic butterfly valve V310 one end by utilidor, and tap one end connects molecular sieve adsorber MS302 one end and ball valve V319B one end, the ball valve V319B other end connects variable valve V311 one end, the variable valve V311 other end connects ball valve V319 one end, the ball valve V319 other end connects Pneumatic butterfly valve V307 and thermo-insulating pipe line one end, and tap one end connects molecular sieve adsorber MS301 one end, on described Pneumatic butterfly valve V307 and V308 and variable valve V311, be respectively equipped with three-way solenoid valve and PLC programming Control, the other end of molecular sieve adsorber MS301 is connected to ball valve V318A successively by thermo-insulating pipe line or pipeline, Pneumatic butterfly valve V303 and V301, ball valve V312 one end, the other end of molecular sieve adsorber MS302 is connected to ball valve V318B Pneumatic butterfly valve V304 and V302 successively by thermo-insulating pipe line or pipeline, ball valve V313 one end, described ball valve V318A links together by pneumatic stopping valve V305 and V306 and the ball valve V318B other end, the other end of described Pneumatic butterfly valve V303 is connected with one end of Pneumatic butterfly valve V04, and tap one end is connected in order to emptying with the tap one end between pneumatic stopping valve and V306, described pneumatic stopping valve V305, V306 and Pneumatic butterfly valve V303, V304, V301, on V302, be respectively equipped with three-way solenoid valve and PLC programming Control, the other end and the Pneumatic butterfly valve V302 of described Pneumatic butterfly valve V301 are serially connected, described ball valve V312 and the other end of V313 are serially connected, and on tap one end, connect tap one end of Pneumatic butterfly valve V301 and V302, lower butterfly valve V606B one end connecting on water separating system (I), and be provided with that temperature shows and PLC programming Control, described electric heater EH-301 is connected on the regeneration gas pipeline between two startup butterfly valve V307 and V308 by utilidor, , the air pipe of two described molecular sieve adsorbers is provided with pressure display instrument table and PLC programming Control, the air inlet pipeline of two described molecular sieve adsorbers is provided with temperature and shows and PLC programming Control.

4. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, the inlet pipeline of the pneumatic diaphragm control valve V615 of its feature on described analyzer system (C) is provided with instrument and middle control instrument on the spot, described middle control instrument is provided with PLC programming Control, the inlet pipeline of pneumatic diaphragm control valve V614 on analyzer system (C) is provided with instrument and middle control instrument on the spot, and the Pneumatic butterfly valve V628 on analyzer system (C) is provided with three-way solenoid valve and PLC programming Control.

5. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, the entrance point that it is characterized in that the tracheae of heating in described instrument electric-control system (D) is provided with instrument and PLC programming Control on the spot, the two-way pipeline of instrument electric-control system (D) bearing gas and blanket gas is also provided with instrument on the spot, is also provided with instrument on the spot on decompressor filtrator and spare gas tank.

6. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, it is characterized in that described expander refrigeration system (E) two-way turbo-expander ET501, ET502 outlet pipe are provided with PLC programming Control, the filtrator pipeline of described turbo-expander is provided with gauge pressure on the spot and shows.

7. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, it is characterized in that described ice chest system (F) top is provided with main condenser evaporator E502, the top of main condenser evaporator E502 is provided with instrument temperature on the spot and shows and the control of middle control instrument, on rectification column C501 left part pipeline, be provided with main heat exchanger E503 and temperature and manometer, each road pipeline of described rectification column C501 connects air compressor machine Shang Ge road signal pipe line.

8. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, it is characterized in that the liquid nitrogen storage tank VIE-01A right part surface in described product storage system (G) is provided with pressure liquid level Displaying Meter, liquid nitrogen storage tank VIE-01A lower left quarter is provided with air temperature type vaporizer VAP01 and the VAP02 that pipeline is connected with valve, liquid nitrogen storage tank right lower quadrant is provided with the raffinate carburetor VAP-04 that pipeline is connected with valve, and described product delivery system (J) is provided with the liquid demonstration of middle control instrument.

9. a kind of remote monitoring about nitrogen making machine as claimed in claim 1 and unwatched device, it is characterized in that described voltage-regulating system (H) is provided with analysis warning PLC programming Control and middle control metering device, the compressor of described water separating system (I) is provided with manometer, and separator WS201 is provided with thermometric instrument.

10. the remote monitoring of a relevant nitrogen making machine and the method for unwatched device, comprise network connection computer and PLC Program Appliance instrument, it is characterized in that the method adopts the separated air of Deep Cooling Method, pressurized air enters rectification column after molecular sieve adsorber is removed foreign gas, through rectifying, in overhead product outlet, obtain product nitrogen gas at low temperatures, whole system is by air compression system, precooler, purifier, electric heater, expander refrigeration system, heat interchanger, rectification column equipment, transport and storage system, analyzer system, instrument electric control system forms, on the hardware of all electrical equipments of whole system, be all provided with on the spot and long-range two kinds of Starting mode, by programming Control system and the safety system of PLC formula DCS, the safety and stability that guarantees this device starts, operation and parking, once occur abnormal, automatically start liquid nitrogen back-up system, guarantee uninterrupted air feed, comprise the following steps:

A. ought run into various dangerous situations, in the time of need to stopping in emergency, can by long-range or on the spot emergency stop push button equipment safety is stopped

When emergency stop push button is pressed, system can produce following action:

I. stop main air compressor machine

Ii. automatically cut off ice chest processing air

Iii. stop decompressor

Iv. stop precooler

V. stop purifier program, power failure well heater

Vi. close hold one's breath nitrogen output of products valve and liquid nitrogen product delivery valve

Vii. after device product delivery valve cuts out, sump pressure reduces (PIC611), and back-up system changes according to sump pressure, automatically changes back-up system liquid nitrogen gasification supply valve V16 to maintain the pressure of PI611, guarantees uninterrupted air feed;

B. the control of air compressor machine

I. when opening while meeting the following conditions, air compressor machine allows to start:

(1) signal that air compressor machine self comes allows to start, and the machine is ready for

(2) purifier is ready

(3) enter ice chest watertight aircase complete shut-down

Ii. when there is following situation, air compressor machine can automatic stopping:

(1) the chain factor of air compressor machine self triggers and jumps car

(2) nitrogen-making device emergency stop push button is pressed;

C. the control of precooler

I. precooler self, with temperature control system, can be controlled outlet temperature between 5～8 degree;

Ii. excessive when airload, precooler outlet temperature can raise, when higher than certain value (20 ℃), if continue operation, go down, can produce harm to rear system, now system can be stopped by automatic linkage ice chest, prevent that purifier from penetrating, the objectionable impurities such as moisture, carbon dioxide are brought ice chest into;

Iii. when airload is too low, precooler outlet temperature can be lower than 5 degree, if continue to reduce, airborne moisture has icing danger, and when temperature is spent lower than 2, now the system precooler that can automatically stop, restarts precooler when equitemperature gos up to spend to 5;

D. the control of purifier

I. the control of electric heater:

(1) in electric heater, heating wire divides three groups, normally uses two groups, and when precooler fault, adsorption cycle shortens to 4 hours, the 3rd group of heater strip that come into operation while simultaneously regenerating, and electric heater is controlled regeneration gas and is gone out electric heater temperature stabilization (180 degree);

(2) it is high high chain and regeneration gas flow is low chain that electric heater is established outlet temperature, prevents electric heater dry combustion method, and heating wire burns out;

Ii. the time sequential control of purifier

Totally 2 of purifier absorbing cylinders, an absorption, a regeneration, two are alternately cut off and use, and adsorption cycle divides 4 hours periods (without precooler operating mode) and 8 hours (having precooler operating mode) according to the situation of precooler, and absorption hockets according to following steps:

All press--1 horn pressure release in parallel--1 horn heating--1 horn cold blowing--all pressure-parallel connections--2 horn pressure releases--2 horn heating--, 2 horn cold blowings;

Iii. purifier entry condition

(1) compressor operation

(2) precooler outlet temperature does not reach high value (20 ℃)

Iv. regeneration gas flow is controlled

(1) regeneration gas flow is controlled by PIC-603, and it is disposed to sound suppressor SL-301 by unnecessary regeneration gas;

(2) this controller is relevant to molecular sieve step order, when heating starts and cold blowing finishes, can cause that the play of regeneration gas demand changes greatly, when molecular sieve correlation step (heating and prepare pressurising) starts, molecular sieve sequence controller presets V628(PIC603) aperture, when heating starts, force output valve position signal to 20% then to get back to automatic mode; Preparing to force output valve position signal to 75% then to get back to automatic mode when pressurising starts;

E. the control of ice chest

I. the parking of ice chest

(1) when there is following situations, during ice chest meeting automatic stopping

A) air compressor machine is let out and is carried or stop

B) V612 closes

C) purifier outlet temperature is higher than 60 ℃

D) purifier top hole pressure is lower than 5bar

E) lead cold liquid level lower than 20%

F) time delay of purifier sequence was over 75 minutes

(2) ice chest produces following action after stopping

A) V612 solenoid valve dead electricity is closed

B) V601 standard-sized sheet

C) FIC604-1 and FIC604-2 force manually output 0, complete shut-down V614, V615

D) complete shut-down expander inlet valve V504, V505, stop decompressor

E) close liquid air throttling valve V510

F) standard-sized sheet regeneration gas by-pass valve V325

G) decompressor by-pass valve V501 forces manual-lock

H) complete shut-down tapping valve V18

I) regeneration gas atmospheric valve V628 forces to beat automatically

J) complete shut-down liquid nitrogen delivery valve V511, liquid nitrogen container admission valve V08A, opens liquid nitrogen bleed valve V09A

Ii. ice chest allows entry condition

(1) at the bottom of rectification column liquid level not higher than 75%

(2) lead cold liquid level not higher than 90%

F. the control of turbo-expander

I. decompressor stops chain

(1) cause the reason of decompressor jumping car:

A) decompressor rotating speed high (SIACS501/502)

B) bearing atmospheric pressure low (PIAS401/402)

C) HIC612 closes (ice chest parking)

(2) decompressor moves after jumping car:

A) close admission valve V504/V505, stop decompressor

Ii. expander inlet valve is controlled

Expander inlet valve is by leading cold liquid level (LIAC502-1) and decompressor rotating speed (SIACS501/502)

Low selected control system;

Iii. decompressor by-pass valve is controlled

Decompressor by-pass valve is controlled by main cold pressure PI506, pressure Gao Kai great, on the contrary turn down;

G. the control of rectification column

I. according to the extraction ratio of product nitrogen, set empty nitrogen ratio, enter the ratio of tower air capacity and product nitrogen, when air compressor machine electric current is when TV university allows working current following, device operates under output restriction mode, according to client's Determination of quantity nitrogen output, according to output, adjusts air compressor machine load; When current of electric has reached maximum while allowing working current, device is transformed under motor restriction mode, air compressor machine enter that tower air capacity is come and empty nitrogen recently determining device output is big or small; Output setting value upper and lower limit is meanwhile set;

Ii. enter tower air capacity closely bound up with device cold, cold enters tower air capacity more to be increased, otherwise, air capacity reduces, the control of nitrogen-making device cold is adjusted in coming by decompressor payload and liquid nitrogen product withdrawal amount, decompressor is generally used for the large cold balancing of integral body to adjust, and the reacting condition that small cold variation can hinder by tower out, takes out valve adjustment by liquid nitrogen product;

Iii. according to main cold liquid level, rise or downtrending come judgment means cold number, main cold liquid level rises, and illustrate that cold is many, need to close decompressor, main cold liquid level decline illustrates that cold is few, need to drive decompressor;

Iv. decompressor load arranges the upper limit, prevents decompressor hypervelocity;

V. decompressor load arranges lower limit, prevents because of main cold liquid level response lag, causes decompressor overshoot and to affect empty divided working status disorderly;

Vi. tower hinders when high, illustrates that cold is many, opens large liquid nitrogen and takes out valve, increases cold and externally exports;

Vii. tower hinders when low, illustrates that cold is few, turns down liquid nitrogen and takes out valve, reduces cold and externally exports;

Viii. gas nitrogen output of products is controlled automatically according to flow, and flow setting value calculates according to empty nitrogen ratio by processing air capacity, and automatic assignment is to flow controller;

Ix. descend tower liquid level to control according to liquid air throttling;

X. product purity adopts two analyser monitorings, any analyser detects product quality and exceeds standard, and automatically cuts off the output of gas and fluid product, automatically starts back-up system, guarantee that for the nitrogen quality toward client's pipe network be qualified, and be continuously unbroken;

H. the control of product

I. gas nitrogen product flow is controlled

Product valve V615 is by flowmeter FIC604-V615 and the low selected control system of pressure controller PIC605, and product atmospheric valve V614 is controlled by FIC604-614, and the setting value of FIC604-V614 is less by 10% than the setting value of FIC604-V615;

Ii. gas nitrogen product purity analysis and Control

When product purity AIAS-601A or AIAS602 purity oxygen content are when high, move as follows:

(1) close the nitrogen product valve V615 that holds one's breath

(2) open gas nitrogen product atmospheric valve V614, preset opening value (60%) is then got back to automatically

(3) open solenoid valve V638(after nitrogen product purity is qualified, nitrogen product valve V615 opens, and V638 postpones to close after 30s again)

(4) close liquid nitrogen product valve V511, put manually

(5) close liquid nitrogen and go storage tank valve V08A(operator hand-reset on PLC)

(6) open liquid nitrogen blow down valve V09A(operator hand-reset on PLC)

Iii. gas nitrogen product temperature is controlled

When gas nitrogen product temperature TIAS-604 temperature is low, move as follows:

(1) close nitrogen product valve V615

(2) close nitrogen atmospheric valve V614

Iv. liquid nitrogen product valve is controlled

(1) lead cold liquid level LIACS-502 and increase, open large V511; Otherwise, turn down; It is large that PDIAC-501 resistance becomes, and opens large V511; Otherwise, turn down, when LIACS-502 controls together with PDIAC-501, V511 aperture between carries out low choosing, and V511 aperture arranges the upper limit, and higher limit can be rewritten, and prevents that liquid nitrogen withdrawal amount is excessive, causes operating mode out of control;

(2) when the liquid level LIAS-1801A of liquid nitrogen storage tank is high (97%), automatically close liquid nitrogen product valve V511;

(3), when pressure tower and wet tank pressure difference value are less than 0.2Bar instantly, automatically close liquid nitrogen product valve V511;

V. analyser cabinet purge solenoid valve is controlled:

AIAS-601A>9PPM, opens protection pneumoelectric magnet valve, simultaneously:

(1) close nitrogen product valve V615

(2) close liquid nitrogen product valve V511

(3) close liquid nitrogen and go storage tank valve V08A(operator manual unlocking on PLC)

(4) open liquid nitrogen blow down valve V09(operator manual unlocking on PLC)

I. back-up system is controlled

When device causes output of products valve V615 to close because a variety of causes is chain, pipe network gas tank pressure P IC611 can reduce, the liquid nitrogen that now back-up system is stored is after gasifier is gasificated into, by V16 valve automatic makeup, be charged to pipe network, to guarantee uninterrupted air feed, be that sump pressure PIC611 controls V16 valve events, when pressure is low, drive large this valve; Otherwise turn down.

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