CN214693331U - Nitrogen production equipment - Google Patents
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- CN214693331U CN214693331U CN202120924217.7U CN202120924217U CN214693331U CN 214693331 U CN214693331 U CN 214693331U CN 202120924217 U CN202120924217 U CN 202120924217U CN 214693331 U CN214693331 U CN 214693331U
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Abstract
The application provides a nitrogen making device, and relates to the technical field of nitrogen making processes. The nitrogen making equipment comprises a nitrogen preparation system and a nitrogen recovery system; the nitrogen recovery system comprises a mixed gas buffer tank and a compressed air supply device, the mixed gas buffer tank comprises a first air inlet, a second air inlet and a nitrogen outlet, the first air inlet is connected with a nitrogen outer discharge port of the nitrogen preparation system, the nitrogen outer discharge port is used for discharging nitrogen with the purity lower than a preset value, the second air inlet is connected with the compressed air supply device, the compressed air supply device is used for supplying compressed air, and the nitrogen outlet is used for discharging nitrogen mixed gas. The nitrogen making equipment recovers nitrogen with the purity lower than the preset value through the nitrogen recovery system, and the recovered nitrogen is mixed with compressed air in proportion to obtain reusable nitrogen mixed gas with medium purity, so that the waste of energy is avoided, and the use cost is reduced.
Description
Technical Field
The application relates to the technical field of nitrogen making processes, in particular to nitrogen making equipment.
Background
In industrial production, nitrogen is used as a protective gas in the process chain to prevent oxidation of materials in the vessel.
At present, the nitrogen making machine takes air as an air source, forms nitrogen with higher purity after oxygen is adsorbed by a molecular sieve, a purity detecting instrument is arranged at an outlet of the nitrogen making machine, when the detected nitrogen purity is lower than 99.95%, an exhaust valve is opened to exhaust unqualified nitrogen until the nitrogen purity reaches a standard, and then the exhaust valve is closed. Because the purity of the unqualified nitrogen is also more than 99.5 percent, the direct discharge inevitably causes the waste of energy, but the direct use cost is too high.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough among the prior art, the application provides a nitrogen making equipment for solve the current outer nitrogen gas of nitrogen making machine and use unreasonable problem.
In order to achieve the above purpose, the present application provides a nitrogen production apparatus, which includes a nitrogen production system and a nitrogen recovery system;
the nitrogen recovery system comprises a mixed gas buffer tank and a compressed air supply device, wherein the mixed gas buffer tank comprises a first air inlet, a second air inlet and a nitrogen outlet, the first air inlet is connected with a nitrogen outer discharge port of the nitrogen preparation system, the nitrogen outer discharge port is used for discharging nitrogen with the purity lower than a preset value, the second air inlet is connected with the compressed air supply device, the compressed air supply device is used for supplying compressed air, and the nitrogen outlet is used for discharging nitrogen mixed gas.
In a possible embodiment, the pressure of the first inlet port is greater than the pressure of the second inlet port.
In one possible embodiment, the nitrogen recovery system further comprises a first pressure reducing valve and a second pressure reducing valve;
the first pressure reducing valve is arranged between the first air inlet and the nitrogen gas outlet;
the second pressure reducing valve is arranged between the second air inlet and the compressed air supply device;
wherein the set outlet pressure value of the first pressure reducing valve is greater than the set outlet pressure value of the second pressure reducing valve.
In a possible embodiment, the nitrogen recovery system further comprises a third pressure reducing valve disposed at the nitrogen outlet, wherein a set outlet pressure value of the third pressure reducing valve is smaller than a set outlet pressure value of the second pressure reducing valve.
In a possible embodiment, the flow rate of the first inlet port is greater than the flow rate of the second inlet port.
In one possible embodiment, the nitrogen recovery system further comprises a first flow regulating valve and a second flow regulating valve;
the first flow regulating valve is arranged between the first air inlet and the nitrogen gas outlet;
the second flow regulating valve is arranged between the second air inlet and the compressed air supply device;
wherein a valve opening degree of the first flow rate adjustment valve is larger than a valve opening degree of the second flow rate adjustment valve.
In one possible embodiment, the nitrogen recovery system further comprises a first electronic control valve, a second electronic control valve, a purity detector and a controller;
the first electric control valve is arranged between the first air inlet and the nitrogen gas outlet;
the second electric control valve is arranged between the second air inlet and the compressed air supply device;
the purity detector is arranged at the nitrogen outlet and is used for detecting the purity information of the nitrogen discharged from the nitrogen outlet;
the controller is electrically connected with the first electric control valve, the second electric control valve and the purity detector, and is used for acquiring the nitrogen purity and selectively controlling the on-off of the first electric control valve and the second electric control valve.
In a possible embodiment, the nitrogen plant further comprises a first pressure sensor disposed at the mixed gas buffer tank.
In a possible embodiment, the compressed air supply device includes an air compressor unit, a first compressed air buffer tank and a second compressed air buffer tank, the air compressor unit is respectively connected with the first compressed air buffer tank and the second compressed air buffer tank, wherein the first compressed air buffer tank is connected with the second air inlet, and the second compressed air buffer tank is connected with the nitrogen gas preparation system.
In one possible embodiment, the nitrogen plant further comprises a second pressure sensor disposed in the first compressed air buffer tank.
Compared with the prior art, the beneficial effects of the application are that:
the application provides a nitrogen production device, which comprises a nitrogen production system and a nitrogen recovery system; the nitrogen recovery system comprises a mixed gas buffer tank and a compressed air supply device, the mixed gas buffer tank comprises a first air inlet, a second air inlet and a nitrogen outlet, the first air inlet is connected with a nitrogen outer discharge port of the nitrogen preparation system, the nitrogen outer discharge port is used for discharging nitrogen with the purity lower than a preset value, the second air inlet is connected with the compressed air supply device, the compressed air supply device is used for supplying compressed air, and the nitrogen outlet is used for discharging nitrogen mixed gas. The application provides a nitrogen making equipment, the purity that utilizes the mist buffer tank among the nitrogen gas recovery system to collect nitrogen gas outer row mouth and discharge is less than the nitrogen gas of default, and mix the compressed air of the nitrogen gas of retrieving and the compressed air feeding mechanism supply in proportion, obtain the nitrogen gas mist of well purity, and the purity scope of nitrogen gas can be in 90% ~ 95% among this the pure nitrogen gas mist, the well pure nitrogen gas of preparation can be applied to the material filter-pressing that is difficult for the oxidation and consume gas, recycle has been realized, the waste of the energy has been avoided, use cost is reduced simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a block schematic diagram of a nitrogen production apparatus provided by an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a pipe network structure of a nitrogen production plant provided by an embodiment of the present application;
FIG. 3 is a schematic diagram showing the configuration of a nitrogen recovery system in the nitrogen plant of FIG. 2;
fig. 4 is a schematic diagram showing a configuration of a nitrogen gas production system in the nitrogen plant shown in fig. 2.
Description of the main element symbols:
100-nitrogen preparation system; 110-a first absorption column; 111-a second absorption column; 112-nitrogen buffer tank; 112 a-a fourth pressure sensor; 113-an air intake line; 113 a-a first intake control valve; 113 b-second intake control valve; 114-a balancing line; 114 a-a balancing valve; 115-a discharge line; 115 a-main drain pipe; 115 b-branch drain; 115 c-a discharge control valve; 116-nitrogen gas delivery line; 116 a-main delivery pipe; 116 b-branch duct; 116 c-a first delivery control valve; 116 d-a second delivery control valve; 117-nitrogen output line; 117 a-first purity detector; 117 b-discharge tube; 117 c-supply tube; 117 d-third electrically controlled valve; 200-nitrogen recovery system; 210-mixed gas buffer tank; 210 a-a first pressure sensor; 211-a first inlet; 212-a second air inlet; 213-nitrogen outlet; 220-a compressed air supply; 221-a first compressed air buffer tank; 221 a-a second pressure sensor; 222-a second compressed air buffer tank; 222 a-a third pressure sensor; 223-air compressor set; 230 a-first pressure relief valve; 230 b-a second pressure relief valve; 240 a-a first electrically controlled valve; 240 b-a second electrically controlled valve; 250 a-a first flow regulating valve; 250 b-a second flow regulating valve; 260-a second purity detector; 270-a third pressure relief valve; 280-a controller.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Example one
Referring to fig. 1, the nitrogen production apparatus provided in this embodiment is used for producing nitrogen, and no nitrogen is discharged during the production process, so as to avoid wasting energy.
The nitrogen making apparatus provided by this embodiment includes a nitrogen preparation system 100 and a nitrogen recovery system 200, wherein the nitrogen preparation system 100 is used for preparing nitrogen with a purity of 99.99% -99.95%. The nitrogen recovery system 200 is used for recovering and reusing the unqualified nitrogen discharged by the nitrogen preparation system 100.
In this embodiment, nitrogen gas with a purity of 99.99% to 99.95% is defined as high-purity nitrogen; the nitrogen with the purity of 90-95 percent is medium-purity nitrogen. The high-purity nitrogen can be used for protecting the atmosphere of an easily-oxidized process in the chemical production process link, and the medium-purity nitrogen can be used for material filter-pressing gas consumption which is not easily oxidized in the chemical production process link.
The nitrogen preparation system 100 uses compressed air as a gas source, and prepares nitrogen with the purity of 99.99% -99.95% after oxygen is adsorbed by a molecular sieve, and discharges the nitrogen with the purity of less than 99.95% into the nitrogen recovery system 200 for reuse.
Referring to fig. 1, 2 and 3, the nitrogen recycling system 200 includes a mixed gas buffer tank 210 and a compressed air supply device 220, wherein the mixed gas buffer tank 210 is connected to the nitrogen outlet of the nitrogen preparation system 100 and the compressed air supply device 220, respectively. The purity of the nitrogen discharged from the nitrogen outlet is lower than a preset value, and in the embodiment, the preset value can be set to be 99.95%. The compressed air supply device 220 is for supplying compressed air. The mixed gas buffer tank 210 recovers nitrogen with the purity of less than or equal to 99.95% discharged from the nitrogen discharge port and mixes the recovered nitrogen with compressed air in proportion to prepare medium-purity nitrogen with the purity of 90% -95%.
Specifically, the mixed gas buffer tank 210 includes a first inlet 211, a second inlet 212, and a nitrogen outlet 213. The first inlet 211 of the mixed gas buffer tank 210 is connected to the nitrogen gas outlet of the nitrogen gas preparation system 100 through a pipeline, that is, nitrogen gas with a purity lower than a preset value discharged from the nitrogen gas outlet enters the mixed gas buffer tank 210 through the first inlet 211.
The second air inlet 212 of the mixed gas buffer tank 210 is connected to a compressed air supply device 220 through a pipe, and the compressed air supply device 220 supplies compressed air into the mixed gas buffer tank 210 through the pipe via the second air inlet 212. Thus, by controlling the ratio of the nitrogen gas and the compressed air introduced into the mixed gas buffer tank 210, the middle purity nitrogen is produced, and the produced middle purity nitrogen is discharged from the nitrogen outlet 213 of the mixed gas buffer tank 210.
Further, when the nitrogen gas recovery system 200 operates, the pressure of the first gas inlet 211 of the mixed gas buffer tank 210 is greater than the pressure of the second gas inlet 212 to form a pressure difference, so that nitrogen gas discharged from the nitrogen gas discharge outlet preferentially enters the mixed gas buffer tank 210, and the purity of the nitrogen gas in the mixed gas buffer tank 210 meets the purity requirement of medium-purity nitrogen.
Further, the flow rate of the first inlet 211 is greater than that of the second inlet 212, so that the amount of nitrogen entering the mixed gas buffer tank 210 is greater than that of compressed air, and the recovered nitrogen is mixed with the compressed air supplied by the compressed air supply device 220 in proportion to prepare medium-purity nitrogen.
In some embodiments, the nitrogen outlet 213 of the mixed gas buffer tank 210 is used for discharging the nitrogen mixed gas, and the discharged nitrogen mixed gas can be used for processing materials which are not easy to oxidize.
In other embodiments, the nitrogen outlet 213 of the mixed gas buffer tank 210 may be connected to a nitrogen collecting bottle for collection or may be directly supplied to a demand facility for medium-purity nitrogen.
Referring to fig. 2 and fig. 3, further, in the present embodiment, the compressed air supply device 220 can also provide a gas source for the nitrogen preparation system 100 and can also provide available compressed air for the factory.
Specifically, the compressed air supply device 220 includes an air compressor unit 223, a first compressed air buffer tank 221, and a second compressed air buffer tank 222. Wherein, the air compressor unit 223 is respectively connected with the first compressed air buffer tank 221 and the second compressed air buffer tank 222 through a pipeline.
The first compressed air buffer tank 221 is connected to the second gas inlet 212 of the mixed gas buffer tank 210 through a pipeline, and the second compressed air buffer tank 222 is connected to the nitrogen preparation system 100.
Further, the nitrogen recovery system 200 further includes a second pressure sensor 221a, a first pressure sensor 210a and a third pressure sensor 222a, wherein the second pressure sensor 221a is disposed in the first compressed air buffer tank 221, and the second pressure sensor 221a is configured to detect the pressure in the first compressed air buffer tank 221 in real time. The first pressure sensor 210a is disposed in the mixed gas buffer tank 210, and the first pressure sensor 210a is used for detecting the pressure in the mixed gas buffer tank 210 in real time. The third pressure sensor 222a is disposed in the second compressed air buffer tank 222, and the third pressure sensor 222a is used for detecting the pressure in the second compressed air buffer tank 222 in real time.
Referring to fig. 1, fig. 2 and fig. 4, the nitrogen preparation system 100 includes a first absorption tower 110, a second absorption tower 111 and a nitrogen buffer tank 112, the first absorption tower 110 and the second absorption tower 111 are arranged side by side, air inlet pipes 113 located at the bodies of the first absorption tower 110 and the second absorption tower 111 are both connected to an outlet of a second compressed air buffer tank 222, and first air inlet control valves 113a are respectively arranged on the air inlet pipes of the first absorption tower 110 and the second absorption tower 111. Further, a second air intake control valve 113b is provided at the outlet of the second compressed air buffer tank 222.
The nitrogen preparation system 100 comprises a balance pipeline 114, one end of the balance pipeline 114 is connected with the first absorption tower 110, the other end of the balance pipeline 114 is connected with the second absorption tower 111, a balance valve 114a is arranged on the balance pipeline 114, and the balance valve 114a is used for balancing the pressure of the connection of the first absorption tower 110 and the second absorption tower 111.
The nitrogen preparation system 100 includes an oxygen-rich discharge line 115, the oxygen-rich discharge line 115 includes a main discharge pipe 115a and two branch discharge pipes 115b, one end of each of the two branch discharge pipes 115b is connected to the main discharge pipe 115a, the other end of each of the two branch discharge pipes 115b is connected to the bottom of the corresponding first absorption tower 110 and the second absorption tower 111, and a discharge control valve 115c is provided on each of the branch discharge pipes 115 b.
The nitrogen preparation system 100 includes a nitrogen delivery pipe 116, and the nitrogen delivery pipe 116 includes a main delivery pipe 116a and two branch delivery pipes 116b, wherein one end of each of the two branch delivery pipes 116b is connected to the top of the corresponding first absorption tower 110 and the second absorption tower 111, the other end of each of the two branch delivery pipes 116b is connected to the main delivery pipe 116a, and the main delivery pipe 116a is connected to the nitrogen buffer tank 112. And a first delivery control valve 116c is provided on each of the two branch delivery pipes 116b, and a second delivery control valve 116d is provided on the main delivery pipe 116 a.
The first absorption tower 110 and the second absorption tower 111 are alternately operated, and the produced nitrogen is collected into the main transport pipe 116a through the two branch transport pipes 116b and is then fed into the nitrogen buffer tank 112.
Further, a fourth pressure sensor 112a is disposed on the nitrogen buffer tank 112, and the fourth pressure sensor 112a is used for detecting the pressure in the nitrogen buffer tank 112 in real time.
The nitrogen preparation system 100 includes a nitrogen output line 117, one end of the nitrogen output line 117 being connected to an outlet of the nitrogen buffer tank 112, and the other end of the nitrogen output line 117 being connected to a discharge pipe 117b and a supply pipe 117 c. The nitrogen output line 117 is further provided with a first purity detector 117a, wherein the discharge pipe 117b and the supply pipe 117c are connected to the nitrogen output line 117 through a tee joint, and a nitrogen outlet is provided on the discharge pipe 117b, wherein the nitrogen outlet is connected to the first inlet 211 of the mixed gas buffer tank 210 through a pipe. The supply pipe 117c is connected to a nitrogen demand device which demands high-purity nitrogen, and the supply pipe 117c is further provided with a third electronic control valve 117d, and the third electronic control valve 117d can control the on-off of the supply pipe 117 c.
The first purity detector 117a detects the purity of the nitrogen flowing along the nitrogen output line 117 in real time, and discharges the nitrogen from the discharge port of the discharge pipe 117b into the mixed gas buffer tank 210 when the purity of the nitrogen in the nitrogen output line 117 is lower than a preset value, and when the purity of the nitrogen reaches the preset value or more, the nitrogen is used when being delivered from the supply port to a demand facility requiring high purity nitrogen.
In the nitrogen making equipment provided by this embodiment, the mixed gas buffer tank 210 in the nitrogen recovery system 200 is used to collect nitrogen discharged from the nitrogen discharge port, and the recovered nitrogen is mixed with the compressed air supplied by the compressed air supply device 220 in proportion, so as to obtain a nitrogen mixed gas with medium purity, that is, medium pure nitrogen, and the purity range of the medium pure nitrogen is 90% -95%. The prepared medium-purity nitrogen can be applied to filter pressing gas consumption of materials which are not easy to oxidize, recycling is achieved, and waste of energy is avoided. Meanwhile, compared with the method of directly using nitrogen with the purity of 99.5 percent, the method has the advantages of lower use cost and more economical and practical use.
Example two
Referring to fig. 2, fig. 3 and fig. 4, the nitrogen production apparatus provided in this embodiment is used for producing nitrogen. The present embodiment is an improvement on the technology of the first embodiment, and the difference from the first embodiment is that:
in this embodiment, the nitrogen recovery system 200 further includes a first pressure reducing valve 230a, a second pressure reducing valve 230b, a third pressure reducing valve 270, a first flow regulating valve 250a, a second flow regulating valve 250b, a first electronic control valve 240a, a second electronic control valve 240b, a second purity detector 260, and a controller 280.
Wherein, the first pressure reducing valve 230a is disposed on the pipeline between the first gas inlet 211 and the nitrogen gas outlet, the second pressure reducing valve 230b is disposed on the pipeline between the second gas inlet 212 and the first compressed air buffer tank 221, and the third pressure reducing valve 270 is disposed on the nitrogen outlet 213; the set outlet pressure value of the first pressure reducing valve 230a is greater than the set outlet pressure value of the second pressure reducing valve 230b, so that the pressure of the first air inlet 211 is greater than the pressure of the second air inlet 212, a pressure difference is formed, nitrogen discharged from the nitrogen outlet preferentially enters the mixed gas buffer tank 210, and the purity of the nitrogen in the mixed gas buffer tank 210 is greater than the purity of the nitrogen outlet 213 of the mixed gas buffer tank 210.
The set outlet pressure value of the third pressure reducing valve 270 is smaller than the set outlet pressure value of the second pressure reducing valve 230b, so that the pressure of the nitrogen outlet 213 is smaller than the mixed pressure of the gas inside the mixed gas buffer tank 210, and a pressure difference is formed, so as to facilitate the discharge of the prepared medium-purity nitrogen.
Further, a first flow rate adjustment valve 250a is disposed on a pipeline between the first inlet port 211 and the nitrogen gas outlet port, and a second flow rate adjustment valve 250b is disposed on a pipeline between the second inlet port 212 and the first compressed air buffer tank 221. The valve opening degree of the first flow regulating valve 250a is greater than that of the second flow regulating valve 250b, so that the amount of nitrogen entering the mixed gas buffer tank 210 is greater than that of compressed air, and the recovered nitrogen is mixed with the compressed air supplied by the compressed air supply device 220 in proportion to prepare the medium-purity nitrogen.
Further, a first electrically controlled valve 240a is disposed on a pipeline between the first inlet 211 and the nitrogen outlet, and a second electrically controlled valve 240b is disposed on a pipeline between the second inlet 212 and the first compressed air buffer tank 221. The second purity detector 260 is disposed at the nitrogen outlet 213, and the second purity detector 260 detects the purity information of the nitrogen gas discharged from the nitrogen outlet 213.
The controller 280 is electrically connected to the first electric control valve 240a, the second electric control valve 240b and the second purity detector 260, and the controller 280 is configured to obtain the purity of the nitrogen gas, selectively control on/off of the first electric control valve 240a and the second electric control valve 240b, and perform precise proportional control on the nitrogen gas and the compressed air recovered by the mixed gas buffer tank 210, so that the purity of the prepared medium-purity nitrogen is 90% -95%.
Further, the controller 280 is electrically connected to the second pressure sensor 221a, the third pressure sensor 222a, the fourth pressure sensor 112a, the first purity detector 117a, and the third electrically controlled valve 117d, and is configured to obtain real-time pressure information in the first compressed air buffer tank 221, the mixed gas buffer tank 210, and the nitrogen buffer tank 112 in real time.
Optionally, the controller 280 is a PLC controller.
In order to more clearly describe the technical solution of the present embodiment, the following examples are given:
the pressure value in the nitrogen buffer tank 112 in the nitrogen production system 100 is set to 0.8Mpa, the first pressure reducing valve 230a is set to 0.7Mpa, the second pressure reducing valve 230b is set to 0.65Mpa, and the third pressure reducing valve 270 is set to 0.6 Mpa. Therefore, the pressure value of the nitrogen discharged from the nitrogen discharge port entering the mixed gas buffer tank 210 is 0.7Mpa, the pressure value of the compressed air entering the mixed gas buffer tank 210 is 0.65Mpa, and the pressure of the two mixed gases in the mixed gas buffer tank 210 is 0.65 Mpa.
The preparation principle of the medium-purity nitrogen prepared by the mixed gas buffer tank 210 is as follows:
the second purity detector 260 detects the purity information of the nitrogen gas discharged from the nitrogen port 213 in real time, and adjusts the purity by cooperating with the first electric control valve 240a and the second electric control valve 240 b. Specifically, it is known that the content of nitrogen in air is about 78%, the purity of nitrogen discharged from the nitrogen outlet in the nitrogen preparation system 100 is greater than 99.5%, the purity of required medium-purity nitrogen is 90% -95%, and the average required purity is 92.5%.
The purity of the compressed air in the mixed gas buffer tank 210 was set to V1, the volume of nitrogen was set to V2, and V1/V2 ≈ 1/2 from 78% V1+ 99.5% V2 to 92.5% (V1+ V2). That is, the amount of nitrogen required in the mixed gas is 2 times that of the compressed air, and therefore, the valve opening degrees of the first and second flow rate adjustment valves 250a and 250b are set to 2:1 under the condition that the pipe diameters of the pipes are ensured to be the same. The controller 280 may be configured to simultaneously open the first electrically controlled valve 240a and the second electrically controlled valve 240b under conventional conditions to produce the desired medium purity nitrogen.
The specific control flow of the controller 280 is as follows:
the nitrogen recovery system 200 is started, and the controller 280 monitors the purity information of the first purity detector 117a and the second purity detector 260 in real time, wherein when the purity of nitrogen in the purity information detected by the first purity detector 117a obtained by the controller 280 is lower than 99.95%, the controller 280 controls the first electrically controlled valve 240a to be opened, and the third electrically controlled valve 117d on the supply pipe 117c to be closed. Otherwise, the third electrically controlled valve 117d is opened and the first electrically controlled valve 240a is closed.
When the controller 280 obtains that the pressure value detected by the second pressure sensor 221a is greater than 0.65Mpa, the controller 280 controls the first electronic control valve 240a and the second electronic control valve 240b to be closed. When the pressure value detected by the second pressure sensor 221a is less than or equal to 0.60Mpa and the nitrogen purity in the purity information detected by the second purity detector 260 is in the range of 90% -95%, the first electronic control valve 240a and the second electronic control valve 240b are both opened.
Further, when the purity of the nitrogen gas in the purity information detected by the second purity detector 260 is greater than 95%, the first electronic control valve 240a is closed and the second electronic control valve 240b is opened.
Further, when the purity information detects that the purity of the nitrogen gas at the nitrogen outlet 213 is less than 90%, and exceeds the set protection time, the controller 280 controls the second electrically controlled valve 240b to close, and only opens the first electrically controlled valve 240a, so as to improve the purity of the nitrogen outlet 213.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. The nitrogen production equipment is characterized by comprising a nitrogen preparation system and a nitrogen recovery system;
the nitrogen recovery system comprises a mixed gas buffer tank and a compressed air supply device, wherein the mixed gas buffer tank comprises a first air inlet, a second air inlet and a nitrogen outlet, the first air inlet is connected with a nitrogen outer discharge port of the nitrogen preparation system, the nitrogen outer discharge port is used for discharging nitrogen with the purity lower than a preset value, the second air inlet is connected with the compressed air supply device, the compressed air supply device is used for supplying compressed air, and the nitrogen outlet is used for discharging nitrogen mixed gas.
2. The nitrogen plant of claim 1, wherein the pressure of the first gas inlet is greater than the pressure of the second gas inlet.
3. The nitrogen plant according to claim 1 or 2, wherein the nitrogen recovery system further comprises a first pressure reducing valve and a second pressure reducing valve;
the first pressure reducing valve is arranged between the first air inlet and the nitrogen gas outlet;
the second pressure reducing valve is arranged between the second air inlet and the compressed air supply device;
wherein the set outlet pressure value of the first pressure reducing valve is greater than the set outlet pressure value of the second pressure reducing valve.
4. The nitrogen plant of claim 3, wherein the nitrogen recovery system further comprises a third pressure relief valve disposed at the nitrogen outlet, wherein a set outlet pressure value of the third pressure relief valve is less than a set outlet pressure value of the second pressure relief valve.
5. The nitrogen plant of claim 1, wherein the flow rate of the first inlet port is greater than the flow rate of the second inlet port.
6. The nitrogen plant of claim 1 or 5, wherein the nitrogen recovery system further comprises a first flow regulating valve and a second flow regulating valve;
the first flow regulating valve is arranged between the first air inlet and the nitrogen gas outlet;
the second flow regulating valve is arranged between the second air inlet and the compressed air supply device;
wherein a valve opening degree of the first flow rate adjustment valve is larger than a valve opening degree of the second flow rate adjustment valve.
7. The nitrogen generation plant of claim 1, wherein the nitrogen recovery system further comprises a first electrically controlled valve, a second electrically controlled valve, a purity detector, and a controller;
the first electric control valve is arranged between the first air inlet and the nitrogen gas outlet;
the second electric control valve is arranged between the second air inlet and the compressed air supply device;
the purity detector is arranged at the nitrogen outlet and is used for detecting the purity information of the nitrogen discharged from the nitrogen outlet;
the controller is electrically connected with the first electric control valve, the second electric control valve and the purity detector, and is used for acquiring the nitrogen purity and selectively controlling the on-off of the first electric control valve and the second electric control valve.
8. The nitrogen plant of claim 1, further comprising a first pressure sensor disposed at the mixed gas surge tank.
9. The nitrogen making apparatus according to claim 1, wherein the compressed air supply device comprises an air compressor unit, a first compressed air buffer tank and a second compressed air buffer tank, the air compressor unit is connected with the first compressed air buffer tank and the second compressed air buffer tank respectively, wherein the first compressed air buffer tank is connected with the second air inlet, and the second compressed air buffer tank is connected with the nitrogen preparation system.
10. The nitrogen plant of claim 9, further comprising a second pressure sensor disposed in the first compressed air buffer tank.
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| CN114455553A (en) * | 2021-12-29 | 2022-05-10 | 湖南中联重科应急装备有限公司 | Method for producing nitrogen, processor, vehicle and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455553A (en) * | 2021-12-29 | 2022-05-10 | 湖南中联重科应急装备有限公司 | Method for producing nitrogen, processor, vehicle and storage medium |
| CN114455553B (en) * | 2021-12-29 | 2024-01-12 | 湖南中联重科应急装备有限公司 | Method for producing nitrogen gas, processor, vehicle, and storage medium |
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