CN207005713U - Nitrogen feed system - Google Patents
Nitrogen feed system Download PDFInfo
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- CN207005713U CN207005713U CN201720974762.0U CN201720974762U CN207005713U CN 207005713 U CN207005713 U CN 207005713U CN 201720974762 U CN201720974762 U CN 201720974762U CN 207005713 U CN207005713 U CN 207005713U
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Abstract
Nitrogen feed system is the utility model is related to, including：Film nitrogen-making device, nitrogen buffer tank, liquid nitrogen storage tank, liquid nitrogen converter and feed back control system；Film nitrogen-making device includes entrance air compressor machine, air cushioning tank and film group, and entrance air compressor machine, air cushioning tank and film group are sequentially communicated；Liquid nitrogen storage tank is connected with liquid nitrogen converter, and liquid nitrogen converter is connected by first outlet valve with nitrogen buffer tank；Film group is connected by second outlet valve with nitrogen buffer tank, and nitrogen buffer tank nitrogen delivery pipe connection, nitrogen delivery pipe is provided with pressure sensor, and pressure sensor is connected with feed back control system, and feed back control system is connected with second outlet valve.Feed back control system is used for the signal for receiving pressure sensor, second outlet valve is turned on or off according to the signal of pressure sensor, so that the pressure of nitrogen delivery pipe maintains within a preset range, avoid the pressure release of nitrogen from causing nitrogen to be lost in waste, and the operational mode and energy consumption of optimization film nitrogen entrance air compressor machine.
Description
Technical field
Nitrogen supply technical field is the utility model is related to, more particularly to nitrogen feed system.
Background technology
Liquefied natural gas (LNG) receiving station is divided into continuously with nitrogen and interval nitrogen with nitrogen, at present frequently with one kind supply nitrogen
Pattern is, continuously provided with nitrogen by equipment such as film nitrogen, it is necessary to carry out blowing pipeline etc. largely with the operation of nitrogen when come into operation liquid nitrogen
Storage tank, liquid nitrogen are largely gasified after being discharged by liquid nitrogen storage tank by gasifier as nitrogen at room, to meet that receiving station's interval is used
The demand of nitrogen.
Following two problems are primarily present before such a nitrogen supply (NS) type order：
1st, the mode of operation of the film equipment of making nitrogen is the loading of entrance air compressor machine, and air pressurized is delivered into film group, the processing of film group
Passing nitrogen fed downstream afterwards；When air compressor machine outlet pressure rises to the unloading pressure of setting, air compressor machine unloads automatically, directly
Automatic loading again after the on-load pressure of setting is dropped to pressure.This mode of operation determines film nitrogen operationally air compressor machine
Loading and the switching of unloading mode can be relatively frequently carried out, not only increases the loss of power consumption and meeting acceleration equipment.By
Required in the air pressure to entering film group, pressure reduces the nitrogen production capacity that can influence film nitrogen, too low to also result in equipment
Car is jumped, so can not extend plus the purpose at discharge time interval to reach by change air compressor machine plus unloading pressure setting value.
2nd, when liquid nitrogen storage tank does not come into operation for a long time, liquid nitrogen spontaneous vaporization can make liquid nitrogen storage tank superpressure in tank, now
Pressure release need to be carried out to it.Currently used pressure release mode is is vented on the spot, and which is easily operated and pressure release speed is fast, and shortcoming exists
Directly it is vented in the nitrogen of waste nitrogen, and low temperature asphyxiating and certain potential safety hazard is present.Another pressure release mode is logical
Cross the economizing valve flow that liquid nitrogen storage tank carries and unnecessary nitrogen is fed directly to downstream.Which can effectively utilize unnecessary nitrogen
Gas, security is good, but certain inconvenience in practical operation be present.Because the pipe diameter of economizing valve flow is smaller so that let out
Press speed slow, and because the pressure of downstream Nitrogen pipe network is also maintained at higher level, less pressure difference also causes liquid nitrogen to deposit
Pressure in storage tank is not easy to release.Therefore which is not used widely at present.
Utility model content
Based on this, it is necessary to the problem of adding unloading frequent for film nitrogen entrance air compressor machine, and optimization liquid nitrogen storage tank
Pressure release mode, there is provided a kind of nitrogen feed system.
A kind of nitrogen feed system, including：Film nitrogen-making device, nitrogen buffer tank, liquid nitrogen storage tank, liquid nitrogen converter and anti-
Present control device；
The film nitrogen-making device includes entrance air compressor machine, air cushioning tank and film group, the entrance air compressor machine, the air
Surge tank and the film group are sequentially communicated；
The liquid nitrogen storage tank connects with the liquid nitrogen converter, the liquid nitrogen converter by first outlet valve with it is described
Nitrogen buffer tank connects；
The film group is connected by second outlet valve with the nitrogen buffer tank, the nitrogen buffer tank and nitrogen delivery pipe
Connection, the nitrogen delivery pipe are provided with pressure sensor, and the pressure sensor is connected with the feed back control system, described
Feed back control system is connected with the second outlet valve.
Further, the quantity of the liquid nitrogen converter be two, the liquid nitrogen storage tank respectively with two liquid nitrogen
Gasifier connects, and two liquid nitrogen converters connect with the first outlet valve.
Further, the liquid nitrogen storage tank is provided with outlet drain valve, the liquid nitrogen storage tank and the outlet drain
Valve connects.
Further, the liquid nitrogen storage tank is provided with pressure-regulating valve and economizing valve, and the liquid nitrogen storage tank is provided with
First outlet and second outlet, the first outlet connect with the outlet drain valve, and the second outlet passes through the pressure
Regulating valve connects with the economizing valve, and the economizing valve connects with the outlet drain valve.
The beneficial effects of the utility model are：The pressure of the pressure sensor of nitrogen delivery pipe is entered by pressure sensor
Row detection, when the pressure of nitrogen delivery pipe is larger, feed back control system control second outlet valve is closed so that nitrogen delivery pipe
Pressure decline, when the pressure of nitrogen delivery pipe is smaller, feed back control system control second outlet valve is opened so that nitrogen is defeated
Send the pressure of pipe to rise, enable to the pressure of nitrogen delivery pipe to maintain within a preset range, and can effectively avoid nitrogen
Pressure release cause nitrogen to be lost in waste, and the operational mode and energy consumption of film nitrogen entrance air compressor machine can be optimized.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the attachment structure schematic diagram of the nitrogen feed system of an embodiment；
Fig. 2 is a direction structure schematic diagram of the liquid nitrogen storage tank of an embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The all other embodiment obtained, belong to the scope of the utility model protection.
As shown in figure 1, it is the nitrogen feed system 10 of the utility model one embodiment, including：Film nitrogen-making device
100th, nitrogen buffer tank 200, liquid nitrogen storage tank 300, liquid nitrogen converter 400 and feed back control system 500；The film nitrogen-making device
100 include entrance air compressor machine 110, air cushioning tank 120 and film group 130, the entrance air compressor machine 110, the air cushioning tank
120 and the film group 130 be sequentially communicated；The liquid nitrogen storage tank 300 connects with the liquid nitrogen converter 400, the liquid nitrogen gas
Change device 400 to connect with the nitrogen buffer tank 200 by first outlet valve 610；The film group 130 passes through second outlet valve 140
Connected with the nitrogen buffer tank 200, the nitrogen delivery pipe 700 of nitrogen buffer tank 200 connects, the nitrogen delivery pipe 700
Pressure sensor 710 is provided with, the pressure sensor 710 is connected with the feed back control system 500, the feedback control dress
500 are put to be connected with the second outlet valve 140.
Specifically, nitrogen delivery pipe 700 is wherein one section of Nitrogen pipe network, and nitrogen buffer tank 200 passes through nitrogen delivery pipe
700 connect with Nitrogen pipe network, for nitrogen to be delivered into user terminal.Entrance air compressor machine 110 be film air-compressor for nitrogen generator, for pair
Air pressurized, the control after pressurization is delivered to film group 130.The nitrogen of liquid nitrogen storage tank 300 passes through the gas of liquid nitrogen converter 400
Change, be delivered to nitrogen buffer tank 200.Feed back control system 500 is used for the signal for receiving pressure sensor 710, is passed according to pressure
The signal of sensor 710 is turned on or off second outlet valve 140.For example, second outlet valve 140 is magnetic valve, feedback control dress
500 are put to electrically connect with second outlet valve 140.
For example, the pressure value that feed back control system 500 is used to detect in pressure sensor 710 is pre- more than or equal to first
If during value, control second outlet valve 140 is closed, and the pressure value for being detected in pressure sensor 710 is less than or equal to the
During two preset values, control second outlet valve 140 is opened.It should be understood that the feed back control system 500 can use single-chip microcomputer or
Computer realizes that its control mode can use prior art to realize, and the single-chip microcomputer or computer and pressure sensor 710 and
The connected mode of second outlet valve 140 is connected using prior art, for example, single-chip microcomputer or computer pass through RS485 interfaces and pressure
Force snesor 710 and second outlet valve 140 connect, not burdensome description in the present embodiment.
In the present embodiment, by the way that the pressure of Nitrogen pipe network and film nitrogen-making device 100 are carried out into interlocked control, change film nitrogen
The loading of air compressor machine and unloading mechanism, the loading and unloading of film air-compressor for nitrogen generator is controlled with Nitrogen pipe network pressure, extends it and adds
Discharge time interval, to reach the purpose for the switching frequency for reducing loading and unloading mode.
Specifically, P2 is arranged to the closing presure of second outlet valve 140, the Opening pressure of second outlet valve 140 is set
For P3, the high alarming value of pressure of nitrogen delivery pipe 700 is P1, and the low alarming value of pressure of nitrogen delivery pipe 700 is P4, then has P1 ＞
P2 ＞ P3 ＞ P4, and certain surplus is reserved between P3 and P4.When the pressure of nitrogen delivery pipe 700 rises to P2, that is, press
When force value is more than or equal to the first preset value, feed back control system 500 controls second outlet valve 140 to close, entrance air compressor machine 110
Outlet pressure quickly reach unloading setting value and unloaded, because film nitrogen-making device 100 and downstream separate, system pressure can be protected
Hold on operating pressure.When the pressure of nitrogen delivery pipe 700 drops to P3, i.e., pressure value is less than or equal to the second preset value
When, feed back control system 500 controls second outlet valve 140 to open, and is added after the outlet pressure decline of entrance air compressor machine 110
Carry so that nitrogen delivery pipe 700 is boosted.
Due to the loading of entrance air compressor machine 110 and the change of unloading mechanism, make the pressure of nitrogen delivery pipe 700 will not be always
Maintain higher level.Therefore, can be used when the pressure of nitrogen delivery pipe 700 is relatively low, the pressure of liquid nitrogen storage tank 300 is higher
The economizing valve flow carried is the pressure release of liquid nitrogen storage tank 300, and unnecessary nitrogen in liquid nitrogen storage tank 300 is sent directly into nitrogen conveying
Pipe 700, can be that nitrogen delivery pipe 700 supplement certain pressure, further extend entrance air compressor machine 110 plus between discharge time
Every.
In the present embodiment, the pressure of the pressure sensor 710 of nitrogen delivery pipe 700 is carried out by pressure sensor 710
Detection, when the pressure of nitrogen delivery pipe 700 is larger, feed back control system 500 controls second outlet valve 140 to close so that nitrogen
The pressure of letter shoot 700 declines, and when the pressure of nitrogen delivery pipe 700 is smaller, feed back control system 500 controls second outlet
Valve 140 is opened so that the pressure of nitrogen delivery pipe 700 rises, and enables to the pressure of nitrogen delivery pipe 700 to maintain default model
In enclosing, and it can effectively avoid the pressure release of nitrogen from causing nitrogen to be lost in and waste.
For example, the liquid nitrogen converter 400 is communicated in second outlet valve 140 and the nitrogen by first outlet valve 610
Between surge tank 200, i.e., first outlet valve 610 is connected with second outlet valve 140 by three-way pipe with nitrogen buffer tank 200.
For example, three-way pipe is provided with gas leakage detection valve, the gas leakage detection valve is used to detect the air pressure in three-way pipe, example
Such as, the three-way pipe offers detection hole, and the gas leakage detection valve connects with the detection hole, and gas leakage detection valve is connected with air pressure
Sensor, baroceptor are connected with feed back control system, and feed back control system is additionally operable to obtain the signal of baroceptor, this
Sample, the feed back control system by baroceptor obtain nitrogen buffer tank 200 arrival end pressure, and by with nitrogen
The pressure of pressure sensor 710 is compared in delivery pipe 700, can accurately obtain the operating mode of nitrogen buffer tank 200, and favorably
In the further control accuracy improved to second outlet valve 140.For example, when the pressure value of pressure sensor 710 is more than or equal to
During the first preset value, and when the pressure value of baroceptor is smaller, show that nitrogen buffer tank 200 may block, then feedback control
Device 500 sends a warning, to enable staff to understand the operating mode of nitrogen buffer tank 200, to nitrogen buffer tank 200
Repaired.
In order to accurately control the pressure of nitrogen delivery pipe 700, the frequent opening and closing of second outlet valve 140, example are avoided
Such as, referring again to Fig. 1, nitrogen feed system 10 also includes clock apparatus 800, and feed back control system 500 fills with the clock
800 electrical connections are put, clock apparatus 800 is used to provide clock signal for feed back control system 500, and feed back control system 500 is used for
According to clock signal, signal is obtained from pressure sensor 710 at interval of a preset time, so so that feed back control system 500
It is capable of the pressure value of timing acquisition nitrogen delivery pipe 700, timing detects the pressure value of nitrogen delivery pipe 700, and then effectively avoids
The frequent opening and closing of second outlet valve 140.For example, the clock apparatus 800 can use NTP ((Network Time
Protocol, NTP) network time server realization.
In order to improve the gasification efficiency of liquid nitrogen, further, referring again to Fig. 1, the quantity of the liquid nitrogen converter 400
For two, the liquid nitrogen storage tank 300 connects with two liquid nitrogen converters 400 respectively, two liquid nitrogen converters 400
Connected with the first outlet valve 610.The gasification efficiency of liquid nitrogen can be effectively improved by two liquid nitrogen converters 400.
In order to avoid hypertonia in liquid nitrogen storage tank 300, further, as shown in Fig. 2 the liquid nitrogen storage tank 300
Gas emitting valve 360 is provided with, the liquid nitrogen storage tank 300 connects with the gas emitting valve 360, for example, gas emitting valve
360 are communicated in the top of liquid nitrogen storage tank 300.Specifically, when the storage for a long time of the liquid nitrogen in liquid nitrogen storage tank 300, liquid nitrogen meeting
Spontaneous vaporization, when the amount of liquid nitrogen gasification is larger, by causing, the pressure inside liquid nitrogen storage tank 300 is excessive, therefore, passes through opening
Nitrogen discharge is enabled the pressure of liquid nitrogen storage tank 300 to reduce by the gas emitting valve 360, avoids liquid nitrogen storage tank
Hypertonia in 300.
Rationally utilized in order that obtaining nitrogen, avoid pressure release from causing nitrogen to waste, further, as shown in Fig. 2 described
Liquid nitrogen storage tank 300 is provided with outlet drain valve 330, and the liquid nitrogen storage tank 300 connects with the outlet drain valve 330.Enter
One step, as shown in Fig. 2 the liquid nitrogen storage tank 300 is provided with pressure-regulating valve 340 and economizing valve 350, the liquid nitrogen storage
Tank 300 is provided with first outlet and second outlet, and the first outlet connects with the outlet drain valve 330, and described second goes out
Mouth is connected by the pressure-regulating valve 340 with the economizing valve 350, and the economizing valve 350 and the outlet drain valve 330
Connection, for example, outlet drain valve 330 is connected by three-way pipe with first outlet and economizing valve 350.So, liquid nitrogen storage tank
Nitrogen can be delivered to outlet drain valve 330 by 300 by economizing valve 350, by outlet drain valve 330 by nitrogen discharge.Example
Such as, liquid nitrogen storage tank 300 passes sequentially through pressure-regulating valve 340 and economizing valve 350 connects with nitrogen buffer tank 200, for example, described
Liquid nitrogen storage tank 300 is connected by economizing valve 350 with the liquid nitrogen converter 400, so, caused by liquid nitrogen storage tank 300
Nitrogen can be delivered to nitrogen buffer tank 200, and then enter Nitrogen pipe network, effectively nitrogen can be avoided to waste.
For example, referring again to Fig. 2, the liquid nitrogen storage tank 300 includes outer tank 320 and inner canister 310, the inner canister 310
It is arranged in the outer tank 320, the first outlet and the second outlet are opened in the inner canister 310 respectively, and described first
Outlet connects with the outlet drain valve 330, and the second outlet passes through the pressure-regulating valve 340 and the economizing valve 350
Connection, and the economizing valve 350 connects with the outlet drain valve 330.The inner canister 310 is used to store liquid nitrogen, when inner canister 310
After liquid nitrogen gasification, by respectively by economizing valve 350 and outlet drain valve 330 by nitrogen discharge so that under the pressure in inner canister 310
Drop, and vacuum is arranged between outer tank 320 and inner canister 310, so, outer tank 320 can isolate the heat of outside, outer to reduce
Influence of boundary's heat to the low temperature liquid nitrogen of inner canister.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (4)
- A kind of 1. nitrogen feed system, it is characterised in that including：Film nitrogen-making device, nitrogen buffer tank, liquid nitrogen storage tank, liquid nitrogen Gasifier and feed back control system；The film nitrogen-making device includes entrance air compressor machine, air cushioning tank and film group, the entrance air compressor machine, the air cushioning Tank and the film group are sequentially communicated；The liquid nitrogen storage tank connects with the liquid nitrogen converter, and the liquid nitrogen converter passes through first outlet valve and the nitrogen Surge tank connects；The film group is connected by second outlet valve with the nitrogen buffer tank, the nitrogen buffer tank nitrogen delivery pipe connection, The nitrogen delivery pipe is provided with pressure sensor, and the pressure sensor is connected with the feed back control system, the feedback Control device is connected with the second outlet valve.
- 2. nitrogen feed system according to claim 1, it is characterised in that the quantity of the liquid nitrogen converter is two, The liquid nitrogen storage tank connects with two liquid nitrogen converters respectively, two liquid nitrogen converters with the first outlet Valve connects.
- 3. nitrogen feed system according to claim 1, it is characterised in that the liquid nitrogen storage tank is provided with outlet drain Valve, the liquid nitrogen storage tank connect with the outlet drain valve.
- 4. nitrogen feed system according to claim 3, it is characterised in that the liquid nitrogen storage tank is provided with pressure regulation Valve and economizing valve, the liquid nitrogen storage tank are provided with first outlet and second outlet, the first outlet and the outlet drain Valve is connected, and the second outlet is connected by the pressure-regulating valve with the economizing valve, and the economizing valve and the outlet Drain valve connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720974762.0U CN207005713U (en) | 2017-08-04 | 2017-08-04 | Nitrogen feed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720974762.0U CN207005713U (en) | 2017-08-04 | 2017-08-04 | Nitrogen feed system |
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| CN207005713U true CN207005713U (en) | 2018-02-13 |
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| CN201720974762.0U Active CN207005713U (en) | 2017-08-04 | 2017-08-04 | Nitrogen feed system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108523539A (en) * | 2018-05-25 | 2018-09-14 | 凯迈（洛阳）航空防护装备有限公司 | A kind of nitrogen humidity controlling system processed for style evolvement |
| CN113217817A (en) * | 2021-04-29 | 2021-08-06 | 中国人民解放军63796部队 | Large-flow low-pressure online gas supply system |
| CN114234047A (en) * | 2021-12-03 | 2022-03-25 | 清远南玻节能新材料有限公司 | Nitrogen pressure-stabilizing energy-saving system and method for liquid nitrogen storage tank |
-
2017
- 2017-08-04 CN CN201720974762.0U patent/CN207005713U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108523539A (en) * | 2018-05-25 | 2018-09-14 | 凯迈（洛阳）航空防护装备有限公司 | A kind of nitrogen humidity controlling system processed for style evolvement |
| CN113217817A (en) * | 2021-04-29 | 2021-08-06 | 中国人民解放军63796部队 | Large-flow low-pressure online gas supply system |
| CN114234047A (en) * | 2021-12-03 | 2022-03-25 | 清远南玻节能新材料有限公司 | Nitrogen pressure-stabilizing energy-saving system and method for liquid nitrogen storage tank |
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| CP03 | Change of name, title or address |
Address after: 578101 No. 75 Binhai Avenue, Yangpu Economic Development Zone, Hainan Province Patentee after: National Pipe Network Group Hainan Natural Gas Co.,Ltd. Address before: 578101 office area of CNOOC Hainan Natural Gas Co., Ltd., east of Binhai Avenue, Yangpu Economic Development Zone, county-level administrative unit directly under the central government of Hainan Province Patentee before: CNOOC HAINAN NATURAL GAS Co.,Ltd. |