CN103058153A - Nitrogen preparation recycle system and control method thereof - Google Patents
Nitrogen preparation recycle system and control method thereof Download PDFInfo
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- CN103058153A CN103058153A CN2012105569556A CN201210556955A CN103058153A CN 103058153 A CN103058153 A CN 103058153A CN 2012105569556 A CN2012105569556 A CN 2012105569556A CN 201210556955 A CN201210556955 A CN 201210556955A CN 103058153 A CN103058153 A CN 103058153A
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Abstract
The invention discloses a nitrogen preparation recycle system and a control method thereof. In the nitrogen preparation recycle system and the control method of the nitrogen preparation recycle system, a first pressure detector is arranged on an air-out pipeline of a nitrogen reservoir and used for detecting nitrogen pressure in the air-out pipeline of the nitrogen reservoir, a load controlling valve is arranged on an air outlet of a compressed air reservoir and used for adjusting air-out flow of the compressed air reservoir, the nitrogen preparation recycle system is provided with a load controller which is respectively connected with the first pressure detector and the load controlling valve, opening of the load controlling valve is adjusted according to the nitrogen pressure detected by the first pressure detector, accordingly when the nitrogen is overproduced, the nitrogen pressure detected by the first pressure detector is great, the opening of the load controlling valve is reduced through the load controller (the compressed air which goes into a nitrogen preparation device is reduced) to reduce nitrogen production, so that waste of energy is avoided, and system operating cost is reduced. Therefore, the nitrogen preparation recycle system and the control method of the nitrogen preparation recycle system resolve the problems of the prior art.
Description
Technical field
The application relates to the production control technical field, relates in particular to a kind of nitrogen and prepares recovery system and control method thereof.
Background technology
Industrial nitrogen is isolated the modes such as airborne oxygen and nitrogen employing pressure-variable adsorption usually.The technical process that existing industrial nitrogen prepares recovery system is: compressed air reservoir is sent into the nitrogen preparing device after with air compressing; The nitrogen preparing device makes nitrogen by modes such as pressure-variable adsorptions, sends into successively nitrogen storage storage, low-pressure nitrogen holder; According to the different needs of nitrogen use equipment, the low-pressure nitrogen holder directly offers nitrogen use equipment, perhaps, sends into the high pressure nitrogen holder first after the topping-up pump supercharging, offers use equipment again; After the purifying treatment such as nitrogen recycling storage hydathode, nitrogen cooler, refrigerating apparatus and nitrogen air-return water separator reclaim draining, the deoxygenation of regenerating that the nitrogen that contains moisture that use equipment is discharged is sent into successively, again supply with nitrogen use equipment and use.
Yet in realizing process of the present invention, the applicant finds that existing nitrogen prepares the nitrogen preparation amount of recovery system fails to be well controlled, and the excessive condition of production of nitrogen often occurs, causes the waste of the energy, has increased systematic running cost usefulness.
Summary of the invention
In view of this, the application's purpose is to provide a kind of nitrogen to prepare recovery system and control method thereof, prepares the problem that recovery system is prone to the excessive condition of production, causes energy dissipation to solve existing nitrogen.
For achieving the above object, the application provides following technical scheme:
A kind of nitrogen prepares the recovery system control method, and described system comprises preparation unit and recovery unit, and described preparation unit comprises compressed air reservoir, nitrogen preparing device, nitrogen storage storage and low-pressure nitrogen holder, and described method comprises:
Detect the nitrogen pressure in the described nitrogen storage storage outlet pipe, with the nitrogen pressure in the described nitrogen storage storage outlet pipe as the first pressure;
Regulate the airshed that of described compressed air reservoir according to described the first pressure.
Preferably, the air outlet of described compressed air reservoir is provided with load control valve, is used for the airshed that of regulating described compressed air reservoir;
The described airshed that goes out of regulating described compressed air reservoir according to described the first pressure comprises:
When described the first pressure during greater than preset pressure, reduce the aperture of load control valve; When described the first pressure during less than preset pressure, increase the aperture of described load control valve; Described load control valve is arranged at the air outlet of described compressed air reservoir.
Preferably, described preparation unit also comprises the high pressure nitrogen holder;
Described method also comprises:
Detect the nitrogen pressure in the described high pressure nitrogen holder outlet pipe, with the nitrogen pressure in the described high pressure nitrogen holder outlet pipe as the 3rd pressure;
Regulate the supercharging multiple of described increase pump according to described the 3rd pressure.
Preferably, described nitrogen preparing device comprises the first nitrogen preparing device and the second nitrogen preparing device; The working order of described the first nitrogen preparing device and the second nitrogen preparing device is opposite; Described working order comprises preparation state and reproduced state;
Described method also comprises:
Detect nitrogen gas purity and nitrogen flow in the described nitrogen storage storage intake ducting, and with the nitrogen gas purity in the described nitrogen storage storage intake ducting as the first nitrogen gas purity;
When described nitrogen flow during less than the first default purity, changes the working order of described the first nitrogen preparing device and the second nitrogen preparing device greater than preset flow and/or described the first nitrogen gas purity, be in reproduced state person and carry out regenerating molecular sieve.
Preferably, described recovery unit comprises that nitrogen recycling stores hydathode, cooling and refrigerating apparatus, nitrogen air-return water separator and nitrogen recycling treater; The inlet mouth of described nitrogen recycling treater is connected with the air outlet of described nitrogen air-return water separator; The air outlet of described nitrogen recycling treater is connected to the inlet mouth of described high pressure nitrogen holder by the return-air topping-up pump;
Described method also comprises:
Detect the nitrogen pressure in the described nitrogen recycling treater, and with the nitrogen pressure in the described nitrogen recycling treater as the 4th pressure;
Regulate the supercharging multiple of described return-air topping-up pump according to described the 4th pressure;
And/or,
Detect the nitrogen gas purity in the described nitrogen recycling treater outlet pipe, and with the nitrogen gas purity in the described nitrogen recycling treater outlet pipe as the second nitrogen gas purity;
When described the second nitrogen gas purity is preset purity less than second, described nitrogen recycling treater is carried out regenerating molecular sieve.
A kind of nitrogen prepares recovery system, comprise preparation unit and recovery unit, described preparation unit comprises compressed air reservoir, nitrogen preparing device, nitrogen storage storage and low-pressure nitrogen holder, described nitrogen storage storage outlet pipe is provided with the first pressure detecting instrument, for detection of the nitrogen pressure in the described nitrogen storage storage outlet pipe;
The air outlet of described compressed air reservoir is provided with load control valve, is used for the airshed that of regulating described compressed air reservoir;
Described system also comprises load governor, for the nitrogen pressure that detects according to described the first pressure detecting instrument, the aperture of regulating described load control valve.
Preferably, the air outlet of described compressed air reservoir is provided with load control valve, is used for the airshed that of regulating described compressed air reservoir;
The nitrogen pressure that detects when described the first pressure detecting instrument is during greater than preset pressure, and the aperture that described load governor is controlled described load control valve reduces; The nitrogen pressure that detects when described the first pressure detecting instrument is during less than preset pressure, and the aperture that described load governor is controlled described load control valve increases.
Preferably, described preparation unit also comprises high pressure nitrogen holder and high pressure controller;
The inlet mouth of described high pressure nitrogen holder is connected by the air outlet of topping-up pump with the low-pressure nitrogen holder; The air outlet access nitrogen of described high pressure nitrogen holder uses equipment;
Described high pressure nitrogen holder outlet pipe is provided with the 3rd pressure detecting instrument, for detection of the nitrogen pressure in the described high pressure nitrogen holder outlet pipe;
Described high pressure controller is connected with topping-up pump with described the 3rd pressure detecting instrument respectively, for the nitrogen pressure that detects according to described the 3rd pressure detecting instrument, regulates the supercharging multiple of described increase pump.
Preferably, described nitrogen preparing device comprises the first nitrogen preparing device and the second nitrogen preparing device; The working order of described the first nitrogen preparing device and the second nitrogen preparing device is opposite; Described working order comprises preparation state and reproduced state;
Described nitrogen storage storage intake ducting is provided with nitrogen flow detector and the first nitrogen gas purity detector; Described nitrogen flow detector is for detection of nitrogen flow in the described nitrogen storage storage intake ducting; Described the first nitrogen gas purity detector is for detection of the nitrogen gas purity in the described nitrogen storage storage intake ducting;
Described system also comprises refresh controller; Described refresh controller respectively with the nitrogen flow detector be connected the nitrogen gas purity detector and be connected, when being used for nitrogen gas purity that the nitrogen flow that detects when described nitrogen flow detector detects greater than preset flow and/or described the first nitrogen gas purity detector and presetting purity less than first, change the working order of described the first nitrogen preparing device and the second nitrogen preparing device, carry out regenerating molecular sieve.
Preferably, described recovery unit comprises that nitrogen recycling stores hydathode, cooling and refrigerating apparatus, nitrogen air-return water separator and nitrogen recycling treater; The inlet mouth of described nitrogen recycling treater is connected with the air outlet of described nitrogen air-return water separator; The air outlet of described nitrogen recycling treater is connected to the inlet mouth of described high pressure nitrogen holder by the return-air topping-up pump;
Described nitrogen recycling treater is provided with the 4th pressure detecting instrument, for detection of the nitrogen pressure in the described nitrogen recycling treater;
Described system also comprises the back pressure controller; Described back pressure controller is connected with the return-air topping-up pump with the 4th pressure detecting instrument respectively, for the nitrogen pressure that detects according to described the 4th pressure detecting instrument, regulates the supercharging multiple of described return-air topping-up pump;
And/or,
Described nitrogen recycling treater outlet pipe is provided with the second nitrogen gas purity detector, for detection of the nitrogen gas purity in the described nitrogen recycling treater outlet pipe; The recoil mouth of described nitrogen recycling treater is connected to nitrogen by recoil valve and uses equipment, and the venting port of described nitrogen recycling treater is provided with vent valve; Be provided with air outlet valve on the pipeline between nitrogen recycling treater and the return-air topping-up pump,
Described system also comprises return-air control of purity device; Described return-air control of purity device is connected with vent valve with described the second nitrogen gas purity detector, air outlet valve, recoil valve respectively, when the nitrogen gas purity that is used for detecting when described the second nitrogen gas purity detector is preset purity less than second, open described air outlet valve, recoil valve and vent valve, described nitrogen recycling treater is carried out regenerating molecular sieve.
Can find out from above-mentioned technical scheme, the application is by arranging the first pressure detecting instrument P1 that detects nitrogen pressure in the nitrogen storage storage outlet pipe, with the load control valve J1 that regulates compressed air reservoir and go out airshed, and the nitrogen pressure that is detected according to the first pressure detecting instrument P1 by load governor, the aperture of regulating load control valve J1; Thereby it is excessive to work as nitrogen production, when namely the nitrogen pressure that detects of the first pressure detecting instrument P1 is bigger than normal, reduce the aperture (namely reducing the compressed-air actuated amount that enters in the nitrogen preparing device) of load control valve J1 by load governor, reduce the nitrogen production amount, avoid the waste of the energy, reduced systematic running cost usefulness.Therefore, the application has solved the problem of prior art.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiment of the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The nitrogen that Fig. 1 provides for the embodiment of the present application one prepares the recovery system structural representation;
The nitrogen preparing device load pilot circuit schematic diagram that Fig. 2 provides for the embodiment of the present application;
The low-pressure nitrogen reservoir pressure pilot circuit schematic diagram that Fig. 3 provides for the embodiment of the present application;
The nitrogen that Fig. 4 provides for the embodiment of the present application two prepares the recovery system structural representation;
The nitrogen that Fig. 5 provides for the embodiment of the present application two prepares recovery system pilot circuit figure;
The high pressure nitrogen reservoir pressure pilot circuit schematic diagram that Fig. 6 provides for the embodiment of the present application;
The nitrogen that Fig. 7 provides for the embodiment of the present application three prepares the recovery system structural representation;
The nitrogen recycling treater pressure control circuit schematic diagram that Fig. 8 provides for the embodiment of the present application;
The nitrogen that Fig. 9 provides for the embodiment of the present application three prepares recovery system pilot circuit figure;
The nitrogen recycling that Figure 10 provides for the embodiment of the present application stores hydathode draining pilot circuit schematic diagram;
The nitrogen air-return water separator draining pilot circuit schematic diagram that Figure 11 provides for the embodiment of the present application;
The nitrogen that Figure 12 provides for the embodiment of the present application four prepares recovery system control method schema;
The nitrogen that Figure 13 provides for the embodiment of the present application prepares recovery system control method schema;
The nitrogen that Figure 14 provides for the embodiment of the present application prepares recovery system control method schema;
The nitrogen that Figure 15 provides for the embodiment of the present application five prepares recovery system control method schema;
The nitrogen that Figure 16 provides for the embodiment of the present application six prepares recovery system control method schema.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the application's protection.
The embodiment of the present application discloses a kind of nitrogen and has prepared recovery system and control method thereof, prepares the problem that recovery system is prone to the excessive condition of production, causes energy dissipation to solve existing nitrogen.
With reference to Fig. 1, the nitrogen that the embodiment of the present application one provides prepares recovery system, is comprised of preparation unit and recovery unit.The preparation unit is supplied with nitrogen and is used equipment for the preparation of nitrogen; Recovery unit is used for reclaiming the impure nitrogen that nitrogen use equipment is discharged.Wherein preparing the unit comprises: compressed air reservoir 1, nitrogen preparing device 2, nitrogen storage storage 3, low-pressure nitrogen holder 4 and load governor 101.Wherein, the air outlet of compressed air reservoir 1 is connected with the inlet mouth of nitrogen preparing device 2; The air outlet of nitrogen preparing device 2 is connected with the inlet mouth of nitrogen storage storage 3; The air outlet of nitrogen storage storage 3 is connected with the inlet mouth of low-pressure nitrogen holder 4; The air outlet of low-pressure nitrogen holder 4 is connected to nitrogen and uses equipment; Nitrogen uses equipment to be connected with recovery unit.
The outlet pipe of nitrogen storage storage 3, namely nitrogen storage storage 3 is provided with the first pressure detecting instrument P1 with the connecting tube of low-pressure nitrogen holder 4, for detection of the nitrogen pressure in nitrogen storage storage 3 outlet pipes.
The air outlet of compressed air reservoir 1 is provided with load control valve J1, is used for regulating the airshed that of compressed air reservoir 1.
By the said system structure as can be known, the embodiment of the present application is by arranging the first pressure detecting instrument P1 that detects nitrogen pressure in the nitrogen storage storage outlet pipe, with the load control valve J1 that regulates compressed air reservoir and go out airshed, and the nitrogen pressure that is detected according to the first pressure detecting instrument P1 by load governor 101, the aperture of regulating load control valve J1; Thereby it is excessive to work as nitrogen production, when namely the nitrogen pressure that detects of the first pressure detecting instrument P1 is bigger than normal, reduce the aperture (namely reducing the compressed-air actuated amount that enters in the nitrogen preparing device 1) of load control valve J1 by load governor 101, reduce the nitrogen production amount, avoid the waste of the energy, reduced systematic running cost usefulness.Therefore, the embodiment of the present application has solved the problem of prior art.
Concrete, the nitrogen pressure that load governor 101 detects according to the first pressure detecting instrument P1 in above-described embodiment, the mode of the aperture of adjusting load control valve J1 is varied.
For example, in the time of can the nitrogen production amount is normal, the nitrogen pressure in the nitrogen storage storage outlet pipe be as preset pressure.The nitrogen pressure that detects as the first pressure detecting instrument P1 is during greater than this preset pressure, and load governor 101 generates apertures and reduces control signal, and J1 reduces aperture with the control overhead control valve; The nitrogen pressure that detects as the first pressure detecting instrument P1 is during less than this preset pressure, and load governor 101 generates apertures and increases control signals, increases aperture with control overhead control valve J1.
And for example, calculate in advance the nitrogen production amount when normal, the product K of the nitrogen pressure in the nitrogen storage storage outlet pipe and the aperture of load control valve J1, ratio K/P of the nitrogen pressure P that load governor 101 calculating Ks and the first pressure detecting instrument P1 detect, generate corresponding control signal, the regulation of control overhead control valve J1 is to K/P.
Further, still with reference to Fig. 1, in other embodiment of the application, the air outlet of above-described embodiment mesolow nitrogen storage storage 4 also is provided with the second pressure detecting instrument P2 and low-pressure control valve Y2, and the preparation unit that nitrogen prepares recovery system also comprises pressure controller 102.
Wherein, the second pressure detecting instrument P2 is for detection of the nitrogen pressure of low-pressure nitrogen holder 4 air outlets; Low-pressure control valve Y2 is used for regulating the airshed that of low-pressure nitrogen holder 4.Low pressure controller 102 is connected (as shown in Figure 3 with low-pressure control valve Y2 with the second pressure detecting instrument P2 respectively, low pressure controller 102 adopts load control instruments WP-S805), for the nitrogen pressure that detects according to the second pressure detecting instrument P2, regulate the aperture of low-pressure control valve Y2, concrete regulative mode can with reference to the regulative mode of 101 couples of load control valve J1 of load governor, not repeat them here.
When the nitrogen pressure that detects as the second pressure detecting instrument P2 is bigger than normal, low pressure controller 102 control low-pressure control valve Y2 reduce aperture, thereby reduce to enter nitrogen flow and the pressure that nitrogen uses equipment, so that nitrogen is fully utilized in nitrogen use equipment, further avoids energy dissipation, reduce systematic running cost usefulness.
With reference to Fig. 4, the nitrogen that the embodiment of the present application two provides prepares recovery system, is comprised of preparation unit and recovery unit.The preparation unit is supplied with nitrogen and is used equipment for the preparation of nitrogen; Recovery unit is used for reclaiming the impure nitrogen that nitrogen use equipment is discharged.Wherein preparing the unit comprises: compressed air reservoir 1, nitrogen preparing device 2, nitrogen storage storage 3, low-pressure nitrogen holder 4, load governor 101 and refresh controller 201.Wherein, the air outlet of compressed air reservoir 1 is connected with the inlet mouth of nitrogen preparing device 2; The air outlet of nitrogen preparing device 2 is connected with the inlet mouth of nitrogen storage storage 3; The air outlet of nitrogen storage storage 3 is connected with the inlet mouth of low-pressure nitrogen holder 4; The air outlet of low-pressure nitrogen holder 4 is connected to nitrogen and uses equipment; Nitrogen uses equipment to be connected with recovery unit.
The outlet pipe of nitrogen storage storage 3, namely nitrogen storage storage 3 is provided with the first pressure detecting instrument P1 with the connecting tube of low-pressure nitrogen holder 4, for detection of the nitrogen pressure in nitrogen storage storage 3 outlet pipes.The air outlet of compressed air reservoir 1 is provided with load control valve J1, is used for regulating the airshed that of compressed air reservoir 1.Load governor 101 is connected with load control valve J1 with the first pressure detecting instrument P1 respectively, for the nitrogen pressure that detects according to the first pressure detecting instrument P1, regulates the aperture of load control valve J1.
The pilot circuit of the described system of above-described embodiment as shown in Figure 5.With reference to Fig. 4 and Fig. 5, the working process of the described system of above-described embodiment is as follows.
When system put into operation, the system of pressing started knob SB1, and the first nitrogen preparing device 21 starting relay 1K get electric and pass through 1K
1Self-locking, start-up point 1K
3Closure, load control valve J1 opens, and 1# intake valve DJ1 opens, and 1# air outlet valve DC1 opens, start-up point 1K
5Closure, leaving air control valve C1 opens, and the first nitrogen preparing device 21 enters the preparation state, begins to prepare nitrogen.The first nitrogen gas purity detector N1 detects the nitrogen gas purity in nitrogen storage storage 3 intake ductings, and nitrogen flow detector L1 begins to detect nitrogen flow in nitrogen storage storage 3 intake ductings.Judge the nitrogen gas purity that the first nitrogen gas purity detector N1 detects when refresh controller 201 and do not reach default purity, or, when the nitrogen flow that nitrogen flow detector L1 detects reaches preset flow, refresh controller 201 controls the first/the second preparing device switching relay 3K gets electric, the first nitrogen preparing device 21 regenerated signal 3K
1Closure, the first recovery time controller 1KT and the second nitrogen preparing device delay controller 2KT get electric, the first nitrogen preparing device 21 silence signal 1KT
2Disconnect, the first nitrogen preparing device 21 starting relay 1K dead electricity, 1# intake valve DJ1,1# air outlet valve DC1 close, normal battle of the 1KT of the first recovery time controller 1KT
1Time-delay disconnects after closed, 1 2# regeneration control valve DT1 open, 1# regeneration air throttle DP1 and DP2 open, the first nitrogen preparing device 21 enters reproduced state, the regeneration beginning.Normal battle of 1KT through the first recovery time controller 1KT
1Delay adjustments disconnects after closed, 1 2# regeneration control valve DT1,1# regeneration air throttle DP1 and DP2 close, 1# exhaust-valve DPK1 opens, and discharges the oxygen that the regenerating molecular sieve of the first nitrogen preparing device 21 discharges.
The second nitrogen preparing device 22 delay controller 2KT
1Time closing, the second nitrogen preparing device 22 starting relay 2K get electric, and pass through 2K
1Self-locking, start-up point 2K
3Closure, load control valve J1 opens, and 2# intake valve DJ2 opens, and 2# air outlet valve DC2 opens, start-up point 2K
5Closure, leaving air control valve C1 opens, and the second nitrogen preparing device 22 enters the preparation state, begins to prepare nitrogen.The first nitrogen gas purity detector N1 detects the nitrogen gas purity in nitrogen storage storage 3 intake ductings, and nitrogen flow detector L1 begins to detect nitrogen flow in nitrogen storage storage 3 intake ductings.Judge the nitrogen gas purity that the first nitrogen gas purity detector N1 detects when refresh controller 201 and do not reach default purity, or, when the nitrogen flow that nitrogen flow detector L1 detects reaches preset flow, refresh controller 201 controls the second/the first preparing device switching relay 4K gets electric, the second nitrogen preparing device 22 regenerated signal 4K
1Closure, the second recovery time controller 3KT and the first nitrogen preparing device delay controller 4KT get electric, the second nitrogen preparing device 22 silence signal 3KT
2Disconnect, the second nitrogen preparing device 22 starting relay 2K dead electricity, 2# intake valve DJ2,2# air outlet valve DC2,1# exhaust-valve DPK1 close, normal battle of the 3KT of the second recovery time controller 3KT
1Time-delay disconnects after closed, 1 2# regeneration control valve DT1 open, 2# regeneration air throttle DP3 and DP4 open, the second nitrogen preparing device 22 enters reproduced state, the regeneration beginning.Normal battle of 3KT through the second recovery time controller 3KT
1Delay adjustments disconnects after closed, 1 2# regeneration control valve DT1,2# regeneration air throttle DP3 and DP4 close, 2# exhaust-valve DPK2 opens, and discharges the oxygen that the regenerating molecular sieve of the second nitrogen preparing device 22 discharges.
The first nitrogen preparing device 21 preparation delay controller 4KT
1Time closing, the first nitrogen preparing device 21 starting relay 1K get the electric 1K of passing through
1Self-locking, start-up point 1K
3Closed.So circulation is so that the first nitrogen preparing device 21 and 22 alternations of the second nitrogen preparing device.
By said structure and working process as can be known, the nitrogen that the embodiment of the present application provides prepares recovery system, on the one hand, the nitrogen pressure that detects according to the first pressure detecting instrument P1 by load governor 101, regulate the aperture of load control valve J1, thereby solve the excessive energy dissipation that causes of nitrogen production, systematic running cost with high problem.On the other hand, the nitrogen preparing device is comprised of the first nitrogen preparing device and the second nitrogen preparing device, and the nitrogen gas purity that makes when the first nitrogen preparing device does not meet the demands, or produces when excessive, control the first nitrogen preparing device and enter reproduced state, the second nitrogen preparing device enters the preparation state; The first nitrogen preparing device is prepared for again preparing nitrogen through the regenerating molecular sieve deoxygenation; When the second nitrogen preparing device had just entered the preparation state, the nitrogen production amount was less, had relaxed the excessive situation of nitrogen production.Therefore, the embodiment of the present application has solved the prior art nitrogen gas purity without guarantee, and causes the problem of energy dissipation because nitrogen production is excessive.
For improving Security of the system, the described nitrogen of above-described embodiment prepares recovery system also can comprise auxiliary nitrogen preparing device.Should assist the inlet mouth of nitrogen preparing device to be connected with the air outlet of compressed air reservoir 1 by the auxiliary burden control valve, the air outlet of auxiliary nitrogen preparing device is connected in series nitrogen gas purity detector, nitrogen flow detector and leaving air control valve successively, and finally is connected to the inlet mouth of nitrogen storage storage 3.The internal structure of this auxiliary nitrogen preparing device and mode of operation and nitrogen preparing device 2 are identical, do not repeat them here.
Further, for satisfying under the different condition, nitrogen uses the pressure of the required nitrogen of equipment, and in other embodiment of the application, the described nitrogen of above-described embodiment prepares recovery system and also comprises high pressure nitrogen holder 5 and high pressure controller 103.The inlet mouth of high pressure nitrogen holder 5 is connected with the air outlet of low-pressure nitrogen holder 4 by topping-up pump B1; The air outlet access nitrogen of high pressure nitrogen holder 5 uses equipment, for nitrogen use equipment provides pressure higher nitrogen.
The outlet pipe of high pressure nitrogen holder 5 (being the connecting tube that high pressure nitrogen holder 5 and above-mentioned nitrogen use equipment) is provided with the 3rd pressure detecting instrument P3, for detection of the nitrogen pressure in high pressure nitrogen holder 5 outlet pipes, namely high pressure nitrogen holder 5 is sent into the nitrogen pressure in the nitrogen use equipment.
With reference to Fig. 7, the nitrogen that the embodiment of the present application three provides prepares recovery system, is comprised of preparation unit and recovery unit.The preparation unit is supplied with nitrogen and is used equipment for the preparation of nitrogen; Recovery unit is used for reclaiming the impure nitrogen that nitrogen use equipment is discharged.
The preparation unit comprises: compressed air reservoir, nitrogen preparing device, nitrogen storage storage, low-pressure nitrogen holder, high pressure nitrogen holder 5 and load governor.Wherein, the air outlet of compressed air reservoir is connected with the inlet mouth of nitrogen preparing device; The air outlet of nitrogen preparing device is connected with the inlet mouth of nitrogen storage storage; The air outlet of nitrogen storage storage is connected with the inlet mouth of low-pressure nitrogen holder; The air outlet of low-pressure nitrogen holder is connected by the inlet mouth of topping-up pump with high pressure nitrogen holder 5, and the air outlet of low-pressure nitrogen holder also is connected to nitrogen use equipment; The air outlet of high pressure nitrogen holder 5 also is connected to nitrogen and uses equipment.
The outlet pipe of nitrogen storage storage, namely the connecting tube of nitrogen storage storage and low-pressure nitrogen holder is provided with the first pressure detecting instrument P1, for detection of the nitrogen pressure in the nitrogen storage storage outlet pipe.
The air outlet of compressed air reservoir is provided with load control valve J1, is used for regulating the airshed that of compressed air reservoir.
Load governor is connected with load control valve J1 with the first pressure detecting instrument P1 respectively, for the nitrogen pressure that detects according to the first pressure detecting instrument P1, regulates the aperture of load control valve J1, reaches the purpose of Controlling System nitrogen production amount.
Recovery unit comprises: nitrogen recycling stores hydathode 6, cooling and refrigerating apparatus 7, nitrogen air-return water separator 8, nitrogen recycling treater 9, back pressure controller 104 and return-air control of purity device 105.Wherein, nitrogen recycling stores inlet mouth and the nitrogen use equipment connection of hydathode 6; The air outlet that nitrogen recycling stores hydathode 6 is connected with the inlet mouth of cooling and refrigerating apparatus 7; The air outlet of cooling and refrigerating apparatus 7 is connected with the inlet mouth of nitrogen air-return water separator 8; The air outlet of nitrogen air-return water separator 8 is connected with the inlet mouth of nitrogen recycling treater 9; The air outlet of nitrogen recycling treater 9 is connected to the inlet mouth of high pressure nitrogen holder 5 by return-air topping-up pump B3.Be provided with the 4th pressure detecting instrument P4 that detects nitrogen recycling treater 9 interior nitrogen pressures on the nitrogen recycling treater 9, its recoil mouth is connected to nitrogen by recoil valve Z1 and uses equipment, and its venting port is provided with vent valve Z2; Be provided with air outlet valve H1 on the pipeline between nitrogen recycling treater 9 and the return-air topping-up pump B3, and detect the second nitrogen gas purity detector N2 of the nitrogen gas purity in nitrogen recycling treater 9 outlet pipes.
Back pressure controller 104 is connected (as shown in Figure 8 with return-air topping-up pump B3 with the 4th pressure detecting instrument P4 respectively, back pressure controller 104 adopts load control instruments WP-S805), for the nitrogen pressure that detects according to the 4th pressure detecting instrument P4, regulate the supercharging multiple of return-air topping-up pump B3: when the nitrogen pressure that detects as the 4th pressure detecting instrument P4 is bigger than normal, back pressure controller 104 generates corresponding steering order, the control return-air increases pump B3 and reduces the supercharging multiple, thereby reduce nitrogen recycling treater 9 and send into nitrogen pressure in the high pressure nitrogen holder 5, reduce return-air and increase the working load of pump B3, and then reduce energy dissipation; Otherwise, when the nitrogen pressure that detects as the 4th pressure detecting instrument P4 is less than normal, back pressure controller 104 generates corresponding steering order, the control return-air increases pump B3 and increases the supercharging multiple, thereby increase the nitrogen pressure that nitrogen recycling treater 9 is sent in the high pressure nitrogen holder 5, satisfy nitrogen and use equipment to the pressure requirement of nitrogen.The concrete mode that back pressure controller 104 is regulated return-air increase pump B3 also can with reference to the regulative mode of 101 couples of load control valve J1 of load governor, not repeat them here.
Return-air control of purity device 105 increases pump B3 recoil valve Z1 with air outlet valve H1, the second nitrogen gas purity detector N2, return-air respectively and is connected with vent valve Z2, when the nitrogen gas purity that is used for detecting as the second nitrogen gas purity detector N2 is preset purity less than second, stop to carry the nitrogen that reclaims to the high pressure nitrogen holder, and trigger nitrogen recycling treater 9 and carry out the regenerating molecular sieve deoxygenation; Its pilot circuit as shown in Figure 9.
With reference to Fig. 7 and Fig. 9, said system is as follows to the treating processes of the nitrogen that nitrogen recycling treater 9 reclaims.Judge that when return-air control of purity device 105 the second nitrogen gas purity detector N2 detects nitrogen gas purity nitrogen recycling treater 9 in and do not reach second when presetting purity, nitrogen recycling treater 9 enters reproduced state: processing controls rly. 11K gets electric, passes through 11K
1Self-locking, processing control signals 11K
3Closure, time controller 9KT, 10KT get electric, nitrogen recycling treater 9 outlet valve control line 9KT
2Disconnect, the rly. 10K dead electricity of giving vent to anger of starting shooting, air outlet valve H1 closes, and return-air topping-up pump B3 stops, treatment time control 9KT
1Time-delay disconnects after closed, and recoil valve Z1 and vent valve Z2 open, and purity is lower than the nitrogen of the second default purity and is discharged by vent valve Z2; According to time controller 9KT setting-up time, recoil valve Z1 and vent valve Z2 close, simultaneously the Regeneration control end signal 10KT of time controller 10KT
2Time-delay disconnects, processing controls rly. 11K dead electricity, regeneration ending; System recoveries control signal 11K
2Normally closed closed, start give vent to anger rly. 10K get electric, and self-locking, the start control signal 10K that gives vent to anger
3Closure, air outlet valve H1 opens, and return-air topping-up pump B3 starts, and nitrogen recycling treater 9 restarts to adsorb the oxygen that reclaims in the nitrogen.
By above-mentioned treating processes, the embodiment of the present application has realized obtaining purity greater than the nitrogen of the second default purity to reclaiming the processing such as the deoxygenation that dewaters of nitrogen, can again send into high pressure nitrogen holder 5 through after the supercharging, and then be used equipment utilization by nitrogen; The nitrogen gas purity that obtains when the nitrogen recycling treater is during less than the second default purity, the molecular sieve that the nitrogen recycling treater is described is saturated, adsorption of oxygen then by its regenerating molecular sieve of controller, makes it again possess the function that the oxygen in the nitrogen is reclaimed in absorption again.Therefore, the embodiment of the present application has further been avoided energy dissipation, has reduced systematic running cost usefulness.
For improving security of system, can be return-air topping-up pump B3 additional mechanical supercharging pump B4 in parallel in the said system; As the topping-up pump for subsequent use of return-air topping-up pump B3, the mode of connection of additional mechanical supercharging pump B4, working process and return-air topping-up pump B3 are identical.
Further, still with reference to Fig. 7, in other embodiment of the application, the nitrogen of above-described embodiment prepares recovery system and also comprises first row water controller 301 and second row water controller 302.
Nitrogen recycling stores hydathode 6 and is provided with the first liquidometer F1 and first row water valve S1; The first liquidometer F1 stores the liquid level of hydathode 6 for detection of nitrogen recycling; First row water valve S1 is used for the drain discharge that the control nitrogen recycling stores hydathode 6.
First row water controller 301 is connected (as shown in figure 10) with the first liquidometer F1 with first row water valve S1 respectively, for the liquid level that detects according to the first liquidometer F1, regulate first row water valve S1 aperture, make nitrogen recycling store hydathode 6 isolated moisture from nitrogen and in time discharge.
Nitrogen air-return water separator 8 is provided with the second liquidometer F2 and second row water valve S2; The second liquidometer F2 is for detection of the liquid level of nitrogen air-return water separator 8; Second row water valve S2 is used for the drain discharge of control nitrogen air-return water separator 8.
Second row water controller 302 is connected (as shown in figure 11) with the second liquidometer F2 with second row water valve S2 respectively, for the liquid level that detects according to the second liquidometer F2, regulate second row water valve S2 aperture, nitrogen air-return water separator 8 isolated moisture from nitrogen is in time discharged.
Embodiment is corresponding with said system, and the embodiment of the present application four provides a kind of nitrogen to prepare the recovery system control method.
This system is comprised of preparation unit and recovery unit.The preparation unit is supplied with nitrogen and is used equipment for the preparation of nitrogen; Recovery unit is used for reclaiming the impure nitrogen that nitrogen use equipment is discharged.Wherein preparing the unit comprises: compressed air reservoir, nitrogen preparing device, nitrogen storage storage and low-pressure nitrogen holder.Wherein, the air outlet of compressed air reservoir is connected with the inlet mouth of nitrogen preparing device; The air outlet of nitrogen preparing device is connected with the inlet mouth of nitrogen storage storage; The air outlet of nitrogen storage storage is connected with the inlet mouth of low-pressure nitrogen holder; The air outlet of low-pressure nitrogen holder is connected to nitrogen and uses equipment; Nitrogen uses equipment to be connected with recovery unit.
As shown in figure 12, the method comprising the steps of:
S1: detect the nitrogen pressure in the above-mentioned nitrogen storage storage outlet pipe, with it as the first pressure;
S2: the airshed that goes out of regulating compressed air reservoir according to above-mentioned the first pressure.
When above-mentioned the first pressure is bigger than normal, illustrate that nitrogen production is excessive, then reduce the airshed that of compressed air reservoir, namely reduce the compressed-air actuated amount that enters in the nitrogen preparing device, thereby reduce the nitrogen production amount; Otherwise, when the first pressure is less than normal, the nitrogen production quantity not sufficient is described, then increase the airshed that of compressed air reservoir, namely increase the compressed-air actuated amount that enters in the nitrogen preparing device, thereby increase the nitrogen production amount.
By the aforesaid method step as can be known, the embodiment of the present application is by detecting the first pressure (being nitrogen pressure in the nitrogen storage storage outlet pipe), and the airshed that goes out of regulating compressed air reservoir according to this first pressure, thereby it is excessive to work as nitrogen production, when namely the first pressure is bigger than normal, by reducing the airshed that of compressed air reservoir, namely reduce the compressed-air actuated amount that enters in the nitrogen preparing device, reduce the nitrogen production amount, avoided the waste of the energy, reduced systematic running cost usefulness.Therefore, the embodiment of the present application has solved the problem of prior art.
In other embodiment of the application, the embodiment of step S2 is varied in above-described embodiment.
For example, in the time of can the nitrogen production amount is normal, the nitrogen pressure in the nitrogen storage storage outlet pipe be as preset pressure.When the first pressure during greater than this preset pressure, then reduce the airshed that of compressed air reservoir; When the first pressure during less than this preset pressure, then increase the airshed that of compressed air reservoir.
And for example, calculate in advance the nitrogen production amount when normal, the product K that goes out airshed of the nitrogen pressure in the nitrogen storage storage outlet pipe and compressed air reservoir, with the ratio K/P of K and the first pressure P as the suitableeest current airshed that goes out, and regulate compressed air reservoir go out airshed to K/P.
Concrete, load control valve J1 can be set in the air outlet of compressed air reservoir, the airshed that goes out of regulating compressed air reservoir by the aperture of regulating J1.
Further, with reference to Figure 13, in other embodiment of the application, above-described embodiment also comprises step:
S3: detect the nitrogen pressure of low-pressure nitrogen holder air outlet, with it as the second pressure;
S4: the airshed that goes out of regulating the low-pressure nitrogen holder according to above-mentioned the second pressure.
Concrete, low-pressure control valve Y2 can be set in the air outlet of low-pressure nitrogen holder.When the second pressure is bigger than normal, reduce the aperture of Y2; When the second pressure is less than normal, increase the aperture of Y2.Because when the nitrogen pressure of low-pressure nitrogen holder air outlet is excessive, being easy to cause entering nitrogen uses the nitrogen of equipment too much, thereby cause nitrogen not to be fully utilized, this moment is by reducing the aperture of Y2, enter the nitrogen flow that nitrogen uses equipment thereby reduce, so that nitrogen is fully utilized in nitrogen use equipment, further avoids energy dissipation, reduce systematic running cost usefulness.
Further, the nitrogen that above-described embodiment four provides prepares in the recovery system, and the nitrogen preparing device comprises the first nitrogen preparing device and the second nitrogen preparing device; The working order of this first nitrogen preparing device and the second nitrogen preparing device is opposite; Above-mentioned working order comprises running status and halted state.Accordingly, as shown in figure 14, the nitrogen that above-described embodiment four provides prepares the recovery system control method and also comprises step:
S5: detect nitrogen gas purity and nitrogen flow in the nitrogen storage storage intake ducting, and with the nitrogen gas purity in the nitrogen storage storage intake ducting as the first nitrogen gas purity;
S6: when above-mentioned nitrogen flow during less than the first default purity, changes the working order of the first nitrogen preparing device and the second nitrogen preparing device, the deoxygenation of regenerating greater than preset flow and/or the first nitrogen gas purity.
By the aforesaid method step as can be known, the embodiment of the present application detects nitrogen gas purity and the nitrogen flow in the nitrogen storage storage intake ducting, the nitrogen gas purity that makes when the nitrogen preparing device that is in the preparation state (such as the first nitrogen preparing device) does not meet the demands, or produce when excessive, control this nitrogen preparing device and enter reproduced state, another nitrogen preparing device enters the preparation state; By the nitrogen preparing device is carried out the regenerating molecular sieve deoxygenation, prepare for again preparing nitrogen; And another nitrogen preparing device has been when just having entered the preparation state, and the nitrogen production amount is less, has relaxed the excessive situation of nitrogen production.Therefore, the embodiment of the present application has solved the prior art nitrogen gas purity without guarantee, and causes the problem of energy dissipation because nitrogen production is excessive.
The embodiment of the present application five provides a kind of nitrogen to prepare the recovery system control method.
Wherein, this system is comprised of preparation unit and recovery unit.The preparation unit is supplied with nitrogen and is used equipment for the preparation of nitrogen; Recovery unit is used for reclaiming the impure nitrogen that nitrogen use equipment is discharged.Wherein preparing the unit comprises: compressed air reservoir, nitrogen preparing device, nitrogen storage storage, low-pressure nitrogen holder and high pressure nitrogen holder.Wherein, the air outlet of compressed air reservoir is connected with the inlet mouth of nitrogen preparing device; The air outlet of nitrogen preparing device is connected with the inlet mouth of nitrogen storage storage; The air outlet of nitrogen storage storage is connected with the inlet mouth of low-pressure nitrogen holder, and the air outlet of low-pressure nitrogen holder is connected to nitrogen and uses equipment; The inlet mouth of high pressure nitrogen holder is connected with the air outlet of low-pressure nitrogen holder by topping-up pump B1, and the air outlet access nitrogen of high pressure nitrogen holder uses equipment, for nitrogen use equipment provides pressure higher nitrogen; Nitrogen uses equipment to be connected with recovery unit.
As shown in figure 15, the method comprising the steps of:
S1: detect the nitrogen pressure in the above-mentioned nitrogen storage storage outlet pipe, with it as the first pressure;
S2: the airshed that goes out of regulating compressed air reservoir according to above-mentioned the first pressure;
S7: detect the nitrogen pressure in the above-mentioned high pressure nitrogen holder outlet pipe, with it as the 3rd pressure;
S8: regulate the supercharging multiple that increases pump B1 according to above-mentioned the 3rd pressure.
By the aforesaid method step as can be known, the embodiment of the present application is regulated the airshed that of compressed air reservoir on the one hand according to the nitrogen pressure in the nitrogen storage storage outlet pipe, thereby the turnout of control nitrogen is avoided excessive production; On the other hand, regulate the supercharging multiple that increases pump B1 according to the nitrogen pressure in the high pressure nitrogen holder outlet pipe, prevent from using the nitrogen of equipment excessive because hypertonia causes entering nitrogen the phenomenon that can not be fully utilized, thereby both avoided energy dissipation, reduced again systematic running cost usefulness.
The embodiment of the present application six provides a kind of nitrogen to prepare the recovery system control method.
Wherein, this system is comprised of preparation unit and recovery unit.The preparation unit comprises: compressed air reservoir, nitrogen preparing device, nitrogen storage storage, low-pressure nitrogen holder and high pressure nitrogen holder, and for the preparation of nitrogen, supply with nitrogen and use equipment; Recovery unit comprises: nitrogen recycling stores hydathode, cooling and refrigerating apparatus, nitrogen air-return water separator and nitrogen recycling treater, is used for reclaiming the impure nitrogen that nitrogen use equipment is discharged.Wherein, inlet mouth and nitrogen that nitrogen recycling stores hydathode use equipment connection, and the air outlet is connected with the inlet mouth of cooling and refrigerating apparatus; The air outlet of cooling and refrigerating apparatus is connected with the inlet mouth of nitrogen air-return water separator; The air outlet of nitrogen air-return water separator is connected with the inlet mouth of nitrogen recycling treater; The air outlet of nitrogen recycling treater is connected to the inlet mouth of high pressure nitrogen holder by return-air topping-up pump B3.
With reference to Figure 16, the method comprising the steps of:
S1: detect the nitrogen pressure in the above-mentioned nitrogen storage storage outlet pipe, with it as the first pressure;
S2: the airshed that goes out of regulating compressed air reservoir according to above-mentioned the first pressure;
S9: detect the nitrogen pressure in the nitrogen recycling treater, and with it as the 4th pressure;
S10: the supercharging multiple of regulating return-air topping-up pump B3 according to above-mentioned the 4th pressure;
S11: detect the nitrogen gas purity in the nitrogen recycling treater outlet pipe, and with it as the second nitrogen gas purity;
S12: when above-mentioned the second nitrogen gas purity is preset purity less than second, the nitrogen recycling treater is carried out the regenerating molecular sieve deoxygenation.
But by aforesaid method step child, the embodiment of the present application is regulated the airshed that of compressed air reservoir on the one hand according to the nitrogen pressure in the nitrogen storage storage outlet pipe, thereby the turnout of control nitrogen is avoided excessive production; Also realized on the other hand the nitrogen recycling treater is carried out the regenerating molecular sieve deoxygenation, make it again possess the function that the oxygen in the nitrogen is reclaimed in absorption, and regulate the supercharging multiple of return-air topping-up pump according to the nitrogen pressure in the nitrogen recycling treater, thereby the nitrogen of purity after the recycling greater than the second default purity can be carried out again sending into the high pressure nitrogen holder after the suitable supercharging, and then be used equipment utilization by nitrogen.Therefore, the embodiment of the present application has been avoided energy dissipation to a greater extent, has reduced systematic running cost usefulness.
Further, aforesaid method embodiment also comprises step:
Detect the liquid level that nitrogen recycling stores hydathode, as the first liquid level;
Regulate the water discharge valve aperture that nitrogen recycling stores hydathode according to above-mentioned the first liquid level,
The liquid level that stores hydathode according to nitrogen recycling is regulated the water discharge valve aperture that nitrogen recycling stores hydathode, can make nitrogen recycling store hydathode isolated moisture from nitrogen and in time discharge.
Further, aforesaid method embodiment also comprises step:
Detect the liquid level of nitrogen air-return water separator, as the second liquid level;
Regulate the water discharge valve aperture of nitrogen air-return water separator according to above-mentioned the second liquid level.
Water discharge valve aperture according to the liquid level of nitrogen air-return water separator is regulated nitrogen air-return water separator can make nitrogen air-return water separator isolated moisture from nitrogen in time discharge.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, described program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage media can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or store-memory body (Random Access Memory, RAM) etc. at random.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the application.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation of the spirit or scope that do not break away from the application, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a nitrogen prepares the recovery system control method, and described system comprises preparation unit and recovery unit, and described preparation unit comprises compressed air reservoir, nitrogen preparing device, nitrogen storage storage and low-pressure nitrogen holder, it is characterized in that, described method comprises:
Detect the nitrogen pressure in the described nitrogen storage storage outlet pipe, with the nitrogen pressure in the described nitrogen storage storage outlet pipe as the first pressure;
Regulate the airshed that of described compressed air reservoir according to described the first pressure.
2. method according to claim 1 is characterized in that, the air outlet of described compressed air reservoir is provided with load control valve, is used for the airshed that of regulating described compressed air reservoir;
The described airshed that goes out of regulating described compressed air reservoir according to described the first pressure comprises:
When described the first pressure during greater than preset pressure, reduce the aperture of load control valve; When described the first pressure during less than preset pressure, increase the aperture of described load control valve; Described load control valve is arranged at the air outlet of described compressed air reservoir.
3. method according to claim 1 and 2 is characterized in that, described preparation unit also comprises the high pressure nitrogen holder;
Described method also comprises:
Detect the nitrogen pressure in the described high pressure nitrogen holder outlet pipe, with the nitrogen pressure in the described high pressure nitrogen holder outlet pipe as the 3rd pressure;
Regulate the supercharging multiple of described increase pump according to described the 3rd pressure.
4. method according to claim 1 is characterized in that, described nitrogen preparing device comprises the first nitrogen preparing device and the second nitrogen preparing device; The working order of described the first nitrogen preparing device and the second nitrogen preparing device is opposite; Described working order comprises preparation state and reproduced state;
Described method also comprises:
Detect nitrogen gas purity and nitrogen flow in the described nitrogen storage storage intake ducting, and with the nitrogen gas purity in the described nitrogen storage storage intake ducting as the first nitrogen gas purity;
When described nitrogen flow during less than the first default purity, changes the working order of described the first nitrogen preparing device and the second nitrogen preparing device greater than preset flow and/or described the first nitrogen gas purity, be in reproduced state person and carry out regenerating molecular sieve.
5. method according to claim 1 is characterized in that, described recovery unit comprises that nitrogen recycling stores hydathode, cooling and refrigerating apparatus, nitrogen air-return water separator and nitrogen recycling treater; The inlet mouth of described nitrogen recycling treater is connected with the air outlet of described nitrogen air-return water separator; The air outlet of described nitrogen recycling treater is connected to the inlet mouth of described high pressure nitrogen holder by the return-air topping-up pump;
Described method also comprises:
Detect the nitrogen pressure in the described nitrogen recycling treater, and with the nitrogen pressure in the described nitrogen recycling treater as the 4th pressure;
Regulate the supercharging multiple of described return-air topping-up pump according to described the 4th pressure;
And/or,
Detect the nitrogen gas purity in the described nitrogen recycling treater outlet pipe, and with the nitrogen gas purity in the described nitrogen recycling treater outlet pipe as the second nitrogen gas purity;
When described the second nitrogen gas purity is preset purity less than second, described nitrogen recycling treater is carried out regenerating molecular sieve.
6. a nitrogen prepares recovery system, comprise preparation unit and recovery unit, described preparation unit comprises compressed air reservoir, nitrogen preparing device, nitrogen storage storage and low-pressure nitrogen holder, it is characterized in that, described nitrogen storage storage outlet pipe is provided with the first pressure detecting instrument, for detection of the nitrogen pressure in the described nitrogen storage storage outlet pipe;
The air outlet of described compressed air reservoir is provided with load control valve, is used for the airshed that of regulating described compressed air reservoir;
Described system also comprises load governor, for the nitrogen pressure that detects according to described the first pressure detecting instrument, the aperture of regulating described load control valve.
7. system according to claim 6 is characterized in that, the air outlet of described compressed air reservoir is provided with load control valve, is used for the airshed that of regulating described compressed air reservoir;
The nitrogen pressure that detects when described the first pressure detecting instrument is during greater than preset pressure, and the aperture that described load governor is controlled described load control valve reduces; The nitrogen pressure that detects when described the first pressure detecting instrument is during less than preset pressure, and the aperture that described load governor is controlled described load control valve increases.
8. according to claim 6 or 7 described systems, it is characterized in that described preparation unit also comprises high pressure nitrogen holder and high pressure controller;
The inlet mouth of described high pressure nitrogen holder is connected by the air outlet of topping-up pump with the low-pressure nitrogen holder; The air outlet access nitrogen of described high pressure nitrogen holder uses equipment;
Described high pressure nitrogen holder outlet pipe is provided with the 3rd pressure detecting instrument, for detection of the nitrogen pressure in the described high pressure nitrogen holder outlet pipe;
Described high pressure controller is connected with topping-up pump with described the 3rd pressure detecting instrument respectively, for the nitrogen pressure that detects according to described the 3rd pressure detecting instrument, regulates the supercharging multiple of described increase pump.
9. system according to claim 6 is characterized in that, described nitrogen preparing device comprises the first nitrogen preparing device and the second nitrogen preparing device; The working order of described the first nitrogen preparing device and the second nitrogen preparing device is opposite; Described working order comprises preparation state and reproduced state;
Described nitrogen storage storage intake ducting is provided with nitrogen flow detector and the first nitrogen gas purity detector; Described nitrogen flow detector is for detection of nitrogen flow in the described nitrogen storage storage intake ducting; Described the first nitrogen gas purity detector is for detection of the nitrogen gas purity in the described nitrogen storage storage intake ducting;
Described system also comprises refresh controller; Described refresh controller respectively with the nitrogen flow detector be connected the nitrogen gas purity detector and be connected, when being used for nitrogen gas purity that the nitrogen flow that detects when described nitrogen flow detector detects greater than preset flow and/or described the first nitrogen gas purity detector and presetting purity less than first, change the working order of described the first nitrogen preparing device and the second nitrogen preparing device, carry out regenerating molecular sieve.
10. system according to claim 6 is characterized in that, described recovery unit comprises that nitrogen recycling stores hydathode, cooling and refrigerating apparatus, nitrogen air-return water separator and nitrogen recycling treater; The inlet mouth of described nitrogen recycling treater is connected with the air outlet of described nitrogen air-return water separator; The air outlet of described nitrogen recycling treater is connected to the inlet mouth of described high pressure nitrogen holder by the return-air topping-up pump;
Described nitrogen recycling treater is provided with the 4th pressure detecting instrument, for detection of the nitrogen pressure in the described nitrogen recycling treater;
Described system also comprises the back pressure controller; Described back pressure controller is connected with the return-air topping-up pump with the 4th pressure detecting instrument respectively, for the nitrogen pressure that detects according to described the 4th pressure detecting instrument, regulates the supercharging multiple of described return-air topping-up pump;
And/or,
Described nitrogen recycling treater outlet pipe is provided with the second nitrogen gas purity detector, for detection of the nitrogen gas purity in the described nitrogen recycling treater outlet pipe; The recoil mouth of described nitrogen recycling treater is connected to nitrogen by recoil valve and uses equipment, and the venting port of described nitrogen recycling treater is provided with vent valve; Be provided with air outlet valve on the pipeline between nitrogen recycling treater and the return-air topping-up pump,
Described system also comprises return-air control of purity device; Described return-air control of purity device is connected with vent valve with described the second nitrogen gas purity detector, air outlet valve, recoil valve respectively, when the nitrogen gas purity that is used for detecting when described the second nitrogen gas purity detector is preset purity less than second, open described air outlet valve, recoil valve and vent valve, described nitrogen recycling treater is carried out regenerating molecular sieve.
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