CN111207301A - Micro-differential pressure odorizing device and using method thereof - Google Patents
Micro-differential pressure odorizing device and using method thereof Download PDFInfo
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- CN111207301A CN111207301A CN202010155424.0A CN202010155424A CN111207301A CN 111207301 A CN111207301 A CN 111207301A CN 202010155424 A CN202010155424 A CN 202010155424A CN 111207301 A CN111207301 A CN 111207301A
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- metering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The invention discloses a micro-differential pressure odorizing device and a using method thereof, wherein the micro-differential pressure odorizing device comprises the following steps: miniature measuring pump, measuring tank, feed liquor valve, drain valve, odor jar, odor agent nozzle, feed liquor pipe, drain pipe, pressure balance pipe, respiratory tube and tee junction pipe. By the mode, the pressure among the odorous agent tank, the metering tank and the natural gas pipeline is equal, the miniature metering pump can inject the odorous agent into the natural gas pipeline only by overcoming tiny pipeline on-way resistance and odorous agent liquid level difference, the metering precision can be improved, the service life can be prolonged, in addition, the odorous agent conveying amount of the miniature metering pump is periodically compared with the capacity of the metering tank, the metering deviation of the miniature metering pump can be corrected, the odorous agent concentration is ensured not to be out of tolerance, and the safety of a pipeline network is improved.
Description
Technical Field
The invention relates to the technical field of gas application for adding an odorizing agent into a natural gas pipe network, in particular to a micro-differential pressure odorizing device and a using method thereof.
Background
The odorizing device is used for adding odorizing agent into a natural gas pipeline in the natural gas transmission and distribution industry. Natural gas is a flammable and explosive substance, and once leaked in a transmission and distribution pipe network, the natural gas is easy to cause explosion accidents when reaching a certain concentration in air. However, natural gas is colorless and odorless, and once leakage is not easily perceived by people, so natural gas companies generally need to add a certain concentration of odorizing agent in a pipe network according to the amount of natural gas according to the requirements of national standard GB/T50028 so as to enable people to perceive natural gas leakage as soon as possible and take appropriate safety measures, and therefore odorizing devices are needed. Known odorizing devices such as those disclosed in CN104235615A, CN203585821U, CN203823448U and CN204083820U generally adopt a diaphragm metering pump to directly extract odorous agent from an atmospheric odorous agent storage tank and inject the odorous agent into a high-pressure natural gas pipeline. Because the pressure difference between the odorant storage tank and the natural gas pipeline is large, a continuously-operated displacement pump with a small rotation speed and a low pressure cannot be adopted. The diaphragm metering pump is usually driven by a reciprocating plunger, when the metering pump operates, the plunger reciprocates to drive the inlet check valve and the outlet check valve to synchronously open and close, and the plunger pushes the odorous agent to flow towards the opening direction of the check valve, so that the odorous agent overcomes high pressure difference and is injected into a high-pressure natural gas pipeline from a normal-pressure storage tank. The amount of the odorous agent pushed by each reciprocation of the plunger is fixed, and the larger the required amount of the odorous agent is, the larger the frequency of the reciprocation of the plunger is, and the larger the frequency of the opening and closing movement of the check valve is. Along with the reciprocating motion of plunger, the foul solution pressure in the measuring pump is the pulsation change between the ordinary pressure of foul solution storage tank to the high pressure of natural gas line, can produce noise and hydraulic shock. In addition, leakage occurs in both the plunger and the check valve over time due to inevitable mechanical wear. After the plunger leaks, the amount of odorous agent pushed per reciprocation becomes smaller, and the larger the wear, the larger the leak, the smaller the odorous agent flow amount. After the one-way valve is abraded, the one-way valve is not closed tightly when the plunger reciprocates, so that the odor agent flows back and leaks. The leakage is that the larger the pressure difference is, the larger the leakage amount is, and finally, the metering pump cannot overcome high-pressure resistance to inject the odorizing agent into the natural gas pipeline in proportion, so that the odorizing device is in failure. In addition, the metering deviation caused by the leakage of the diaphragm metering pump cannot be detected and calibrated by the diaphragm metering pump, so that the odor in the natural gas pipeline is out of tolerance and cannot be found in time, and potential safety hazards are easily formed.
Disclosure of Invention
The invention mainly solves the technical problem of providing the micro-differential pressure odorizing device and the using method thereof, has the advantages of high reliability, compact structure, high safety, high working efficiency and the like, and has wide market prospect in the application and popularization of the micro-differential pressure odorizing device.
In order to solve the technical problems, the invention adopts a technical scheme that:
provided are a micro-differential pressure odorizing device and a method of using the same, including: measuring pump, metering tank, feed liquor valve, drain valve, odor jar, odor nozzle, feed liquor pipe, drain pipe, pressure balance pipe, breathing pipe and connecting pipe, the both ends of feed liquor pipe respectively with odor jar with the feed liquor valve is linked together, the connecting pipe respectively with feed liquor valve, drain valve and measuring pump are connected, the drain valve passes through the drain pipe with the odor nozzle is connected, odor nozzle intercommunication sets up on natural gas line, the bottom of metering tank with the measuring pump is connected, and its top is connected with the odor jar through breathing pipe, the top of odor jar is passed through pressure balance pipe is connected with natural gas line for odor jar and metering tank have equal pressure with natural gas line.
In a preferred embodiment of the invention, the metering pump adopts a miniature metering pump which can convey fluid in the forward and reverse directions and accurately meter the conveying amount.
In a preferred embodiment of the present invention, the micro metering pump is a continuously operated positive displacement pump driven by a stepping motor, and the micro metering pump includes one of a gear pump, a vane pump or a waist wheel pump.
In a preferred embodiment of the present invention, the connection pipe is a three-way connection pipe, one interface of the micro-metering pump is connected to the three-way connection pipe, and the other interface is connected to the interface at the bottom of the metering tank.
In a preferred embodiment of the present invention, two ends of the liquid inlet pipe are respectively communicated with the bottom outlet of the odor agent tank and the liquid inlet valve, and the top of the metering tank is connected with the top of the odor agent tank through a breathing pipe.
In a preferred embodiment of the invention, the measuring tank is provided with a liquid level detection device for detecting the upper limit liquid level and the lower limit liquid level and accurately measuring and calculating the volume between the calibrated upper limit and the calibrated lower limit.
In a preferred embodiment of the invention, the liquid inlet valve and the liquid outlet valve are both unidirectional in flow.
In a preferred embodiment of the present invention, the pressure level of the odor agent tank is not less than the pressure level of the natural gas pipe into which the odor agent needs to be injected, and the volume thereof is not less than 20 times the volume of the metering tank.
In a preferred embodiment of the present invention, the method of use comprises:
setting the reverse rotation rate of the micro metering pump according to the flow of natural gas in a natural gas pipeline and the concentration proportion of odorous agent to be injected in the natural gas, and setting the process that odorous agent in the metering tank is filled from the lower limit of the liquid level to the upper limit of the liquid level and then is consumed from the upper limit of the liquid level to the lower limit of the liquid level as an operation period;
injecting the odorous agent into the odorous agent tank, and enabling the odorous agent tank and the metering tank to have equal pressure with the natural gas pipeline through the breathing pipe and the pressure balancing pipe;
the liquid inlet valve is opened, the miniature metering pump rotates forwards quickly, so that the odorous agent is quickly injected into the metering barrel from the odorous agent tank through the liquid inlet pipe, the liquid inlet valve and the three-way connecting pipe;
when the liquid level in the metering barrel reaches the upper limit, the liquid inlet valve is closed, and the metering pump stops rotating;
the miniature metering pump rotates reversely, and odorous agent in the metering tank is injected into the natural gas pipeline through the three-way connecting pipe, the liquid outlet valve, the liquid outlet pipe and the odorous agent nozzle according to a preset proportion;
in an operation period, the amount of the odor injected into the natural gas pipeline is metered by the miniature metering pump and is the capacity of the metering barrel;
when the amount of the odor injected into the natural gas pipeline deviates from the capacity of the metering barrel, the running speed of the miniature metering pump is adjusted, and when the deviation value of the amount of the odor injected into the natural gas pipeline and the capacity of the metering barrel exceeds a set threshold value, a fault alarm is given out;
when the amount of odorous agent in the odorous agent tank is lower than a set threshold value, the miniature metering pump cannot fill the metering barrel within a preset revolution, and then a fault alarm is sent out and the odorous agent in the odorous agent tank is prompted to be supplemented.
The invention has the beneficial effects that: make smelly agent jar, metering tank and natural gas line pressure each other equal, miniature measuring pump only need overcome small pipeline on-way resistance and smelly agent liquid head just can pour into the natural gas line into the smelly agent, can improve measurement accuracy and increase of service life, in addition, miniature measuring pump's smelly agent delivery capacity is periodically referred to the contrast with the capacity of metering tank, can revise miniature measuring pump's measurement deviation, ensure that smelly agent concentration is not overproof, improved the pipe network security.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural view of a first embodiment of a micro-differential pressure odorizing device according to the present invention;
fig. 2 is a schematic structural view of a second embodiment of the micro-differential pressure odorizing device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention includes:
a micro-differential pressure odorizing device comprises a micro metering pump 7, a metering barrel 6, a liquid inlet valve 4, a liquid outlet valve 9, an odorous agent tank 2, an odorous agent nozzle 11, a liquid inlet pipe 3, a liquid outlet pipe 10, a pressure balance pipe 1, a breathing pipe 5 and a three-way connecting pipe 8.
In the operation process, the odorous agent pipeline is always communicated with the natural gas pipeline and keeps the same pressure, the miniature metering pump 7 only needs to overcome the resistance generated by small pipeline on-way resistance and odorous agent liquid level difference, and compared with the pressure of the natural gas pipeline from several atmospheric pressures to dozens of atmospheric pressures, the resistance can be almost ignored, so that the miniature metering pump can be used as the miniature metering pump by adopting a small displacement pump, and the miniature metering pump 7 has stable pressure, small power consumption and low noise during operation, and can stably operate without impact so that each operating part can maintain longer service life.
The miniature metering pump can adopt a low-flow miniature gear pump, is driven by a stepping motor, can adjust the rotating speed and record the revolution, and the liquid capacity pushed by the gear pump per revolution is small and accurately fixed. The micro metering pump can also be other low-speed low-pressure small-capacity volumetric pumps such as a vane pump, a waist wheel pump and the like.
Unlike the reciprocating motion of the plunger of a diaphragm metering pump, the micro metering pump adopts a continuous operation mode, hydraulic impact cannot be generated, the pressure is stable, the power consumption is low, and the noise is low. The continuous operation also makes the feed liquor valve and the play liquid valve on the pipeline not need frequent switching, has reduced mechanical wear, has prolonged life greatly. In addition, due to the small pressure difference, even if mechanical abrasion occurs, the odor agent leakage backflow amount is small, and the metering accuracy of the micro metering pump in a longer time is ensured.
The metering barrel 6 has the functions of upper limit liquid level detection and lower limit liquid level detection, and the volume between the upper limit and the lower limit can be accurately measured, calculated and calibrated. The volume of the odor agent determined by each upper and lower limit liquid level change period of the metering tank is compared with the volume metered by the miniature metering pump, namely, the volume of the odor agent delivered by the miniature metering pump is periodically compared with the volume of the metering tank, the metering deviation caused by abrasion can be corrected by adjusting the running speed of the miniature metering pump, and the running state of the odorizing device can be monitored, so that the concentration of the odor agent in a natural gas pipeline cannot be out of tolerance, and the effects of pre-warning pipe network leakage and safety guarantee are achieved.
Consequently, mark miniature measuring pump 7 through metering tank 6 periodically, realized the deodorant addition mode that the detectable can be monitored for deodorant concentration obtains accurate control in the natural gas line, has improved the security of natural gas pipe network monitoring.
The upper and lower limit liquid level detection of the metering barrel 6, the opening and closing of the liquid inlet valve 4, the operation mode of the micro metering pump 7, the flow comparison measurement and calculation of the micro metering pump 7 and the metering barrel 6 and the fault alarm can be programmed and controlled by a PLC.
The withstand voltage grade of the odor agent tank 2 is not less than the natural gas pipeline of the odor agent that needs to be filled, and the odor agent tank with different volumes can be selected according to actual use requirements, the odor agent tank can be provided with a pressure detection device for detecting the internal pressure of the odor agent tank, and instruments and valves such as a liquid level meter, a liquid adding valve, an emptying valve and a blow-down valve can also be added. The liquid inlet valve 4 and the liquid outlet valve 9 can be all electromagnetic valves or one-way valves, and the liquid inlet valve 4 and the liquid outlet valve 9 can also be one of the electromagnetic valves or the one-way valves respectively.
Detailed description of the preferred embodiment
The volume of the odor agent tank can be about 20L, the volume of the metering barrel 6 is about 100mL, and the metering barrel is provided with a liquid level upper limit detection device and a liquid level lower limit detection device.
The liquid inlet valve can be an electromagnetic valve, is opened when liquid is fed, is closed when liquid is discharged, and can only feed liquid from the odor agent tank 2.
The liquid outlet valve 9 is a one-way valve, and the liquid outlet valve can be a one-way valve, and the flow direction of the liquid outlet valve faces the odorous agent nozzle 11.
A pressure balance pipe 1 is connected between the top of the odorous agent tank 2 and a natural gas pipeline into which odorous agent needs to be injected, and the pressure balance pipe is provided with a cut-off valve. The top of the odorous agent tank 2 and the top of the measuring tank 6 are connected by a breathing tube 5.
The bottom of the odorous agent tank 2 is connected with the inlet of the liquid inlet valve 4 by the liquid inlet pipe 3, and a filter and a shut-off valve are arranged between the odorous agent tank and the liquid inlet valve. The outlet of the liquid inlet valve 4, the inlet of the liquid outlet valve 9 and one interface of the micro metering pump 7 are connected by a three-way connecting pipe 8, and the bottom of the metering barrel 6 is connected with the other interface of the micro metering pump 7.
The outlet of the liquid outlet valve 9 is connected with an odorous agent nozzle 11 by a liquid outlet pipe 10, and the odorous agent nozzleAnda stop valve is arranged between the liquid outlet valves.
Before operation, the odorous agent is injected into the odorous agent tank 2 from a packaging barrel or other larger-capacity storage tank in advance.
During operation, the liquid inlet valve 4 is opened, the micro metering pump 7 runs rapidly, odorous agent is rapidly injected into the metering tank 6 from the odorous agent tank 2 through the liquid inlet pipe 3, the liquid inlet valve 4 and the three-way connecting pipe until the liquid level in the metering tank 6 reaches the upper limit, and then the liquid inlet valve 4 is closed and the micro metering pump 7 stops running. Then the micro metering pump 7 is reversed, and the odorous agent in the metering tank 6 is proportionally injected into the natural gas pipeline through the three-way connecting pipe 8, the liquid outlet valve 9, the liquid outlet pipe 10 and the odorous agent nozzle 11.
The rate of reversal of the micro-metering pump 7 is typically determined by the flow rate of the natural gas in the natural gas pipeline and the ratio of the odorizing agent concentration in the natural gas that needs to be odorized. One operation cycle is defined from the lower limit of the metering tank 6 to the upper limit when the tank is full of odorous agent and then from the upper limit when the tank is full of odorous agent to the lower limit. In one operation period, the liquid inlet valve 4 and the liquid outlet valve 9 only need to act once, so that the mechanical abrasion is greatly reduced.
The amount of the odorous agent injected into the natural gas pipeline metered by the micro metering pump 7 in one operation period should be just the capacity of the metering barrel 6. If the speed is larger or smaller, the micro metering pump 7 correspondingly makes an adjustment for slowing down or speeding up the running speed. If the deviation is too large and exceeds the adjusting range of the miniature metering pump, a fault alarm is sent out. If the odor agent in the odor agent tank 2 runs out, the micro metering pump cannot quickly fill the metering barrel 6 within the counted revolution number, and a fault alarm is also sent out to prompt that the odor agent in the odor agent tank 2 needs to be replenished.
Detailed description of the invention
A micro-differential pressure odorizing device comprises a micro metering pump 7, a metering barrel 6, a liquid inlet valve 4, a liquid outlet valve 9, an odorous agent tank 2, an odorous agent nozzle 11, a liquid inlet pipe 3, a liquid outlet pipe 10, a pressure balance pipe 1, a breathing pipe 5 and a three-way connecting pipe 8.
In addition, a normal-pressure odor agent storage tank 12, a liquid adding pump 13 and a connecting pipeline 14 are added, and the liquid adding pump is connected with the normal-pressure odor agent storage tank and the odor agent tank 2 through the connecting pipeline. The atmospheric-pressure odorous agent storage tank 12, which is usually several times larger in volume than the odorous agent tank 2, stores odorous agent in advance, and when the odorous agent in the odorous agent tank 2 is used up, can be refilled with odorous agent by the charge pump 13. The charge pump 13 may be manually or electrically driven.
The invention discloses a micro-differential pressure odorizing device and a using method thereof, and the device has the beneficial effects that: make smelly agent jar, metering tank and natural gas line pressure each other equal, miniature measuring pump only need overcome small pipeline on-way resistance and smelly agent liquid head just can pour into the natural gas line into the smelly agent, can improve measurement accuracy and increase of service life, in addition, miniature measuring pump's smelly agent delivery capacity is periodically referred to the contrast with the capacity of metering tank, can revise miniature measuring pump's measurement deviation, ensure that smelly agent concentration is not overproof, improved the pipe network security.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A differential pressure odorizing device, comprising: measuring pump, metering tank, feed liquor valve, drain valve, odor jar, odor nozzle, feed liquor pipe, drain pipe, pressure balance pipe, breathing pipe and connecting pipe, the both ends of feed liquor pipe respectively with odor jar with the feed liquor valve is linked together, the connecting pipe respectively with feed liquor valve, drain valve and measuring pump are connected, the drain valve passes through the drain pipe with the odor nozzle is connected, odor nozzle intercommunication sets up on natural gas line, the bottom of metering tank with the measuring pump is connected, and its top is connected with the odor jar through breathing pipe, the top of odor jar is passed through pressure balance pipe is connected with natural gas line for odor jar and metering tank have equal pressure with natural gas line.
2. The slightly differential pressure odorizing device of claim 1, wherein the metering pump adopts a micro metering pump which can convey fluid in forward and reverse directions and accurately meter the conveying amount.
3. The micro differential pressure odorizing device according to claim 2, wherein the micro metering pump is a continuously operating positive displacement pump driven by a stepping motor, and the micro metering pump comprises one of a gear pump, a vane pump or a waist wheel pump.
4. The slightly differential pressure odorizing device of claim 2 or 3, wherein the connecting pipe is a three-way connecting pipe, one port of the micro metering pump is connected with the three-way connecting pipe, and the other port of the micro metering pump is connected with the port at the bottom of the metering barrel.
5. The micro-differential pressure odorizing device according to claim 1, wherein two ends of the liquid inlet pipe are respectively communicated with the bottom outlet of the odorizing agent tank and the liquid inlet valve, and the top of the metering tank is connected with the top of the odorizing agent tank through a breathing pipe.
6. The micro-differential pressure odorizing device according to claim 1 or 5, wherein the measuring tank is provided with a liquid level detecting device for detecting an upper limit liquid level and a lower limit liquid level and accurately measuring and calculating the volume between the calibrated upper limit and the calibrated lower limit.
7. The micro-differential pressure odorizing device of claim 1, wherein the liquid inlet valve and the liquid outlet valve are both unidirectional in flow.
8. The micro differential pressure odorizing device according to claim 1, wherein a pressure-resistant level of the odorizing agent tank is not less than a pressure-resistant level of a natural gas pipe to which the odorizing agent is to be injected, and a volume thereof is not less than 20 times a volume of the measuring tank.
9. The micro-differential pressure odorizing device according to claim 1, wherein the using method thereof comprises:
setting the reverse rotation rate of the micro metering pump according to the flow of natural gas in a natural gas pipeline and the concentration proportion of odorous agent to be injected in the natural gas, and setting the process that odorous agent in the metering tank is filled from the lower limit of the liquid level to the upper limit of the liquid level and then is consumed from the upper limit of the liquid level to the lower limit of the liquid level as an operation period;
injecting the odorous agent into the odorous agent tank, and enabling the odorous agent tank and the metering tank to have equal pressure with the natural gas pipeline through the breathing pipe and the pressure balancing pipe;
the liquid inlet valve is opened, the miniature metering pump rotates forwards quickly, so that the odorous agent is quickly injected into the metering barrel from the odorous agent tank through the liquid inlet pipe, the liquid inlet valve and the three-way connecting pipe;
when the liquid level in the metering barrel reaches the upper limit, the liquid inlet valve is closed, and the metering pump stops rotating;
the miniature metering pump rotates reversely, and odorous agent in the metering tank is injected into the natural gas pipeline through the three-way connecting pipe, the liquid outlet valve, the liquid outlet pipe and the odorous agent nozzle according to a preset proportion;
in an operation period, the amount of the odor injected into the natural gas pipeline is metered by the miniature metering pump and is the capacity of the metering barrel;
when the amount of the odor injected into the natural gas pipeline deviates from the capacity of the metering barrel, the running speed of the miniature metering pump is adjusted, and when the deviation value of the amount of the odor injected into the natural gas pipeline and the capacity of the metering barrel exceeds a set threshold value, a fault alarm is given out;
when the amount of odorous agent in the odorous agent tank is lower than a set threshold value, the miniature metering pump cannot fill the metering barrel within a preset revolution, and then a fault alarm is sent out and the odorous agent in the odorous agent tank is prompted to be supplemented.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010155424.0A CN111207301A (en) | 2020-03-09 | 2020-03-09 | Micro-differential pressure odorizing device and using method thereof |
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| CN202010155424.0A CN111207301A (en) | 2020-03-09 | 2020-03-09 | Micro-differential pressure odorizing device and using method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112795463A (en) * | 2020-12-28 | 2021-05-14 | 山东大学 | Automatic single cell separation system and method |
| CN113915531A (en) * | 2021-11-04 | 2022-01-11 | 合肥市久环给排水燃气设备有限公司 | Gas odorization device |
| CN117432946A (en) * | 2023-12-19 | 2024-01-23 | 上海叁零肆零科技有限公司 | Simulation-combined gradient distributed town gas intelligent odorizing method and system |
-
2020
- 2020-03-09 CN CN202010155424.0A patent/CN111207301A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112795463A (en) * | 2020-12-28 | 2021-05-14 | 山东大学 | Automatic single cell separation system and method |
| CN113915531A (en) * | 2021-11-04 | 2022-01-11 | 合肥市久环给排水燃气设备有限公司 | Gas odorization device |
| CN113915531B (en) * | 2021-11-04 | 2024-01-30 | 合肥市久环给排水燃气设备有限公司 | Gas odorizing device |
| CN117432946A (en) * | 2023-12-19 | 2024-01-23 | 上海叁零肆零科技有限公司 | Simulation-combined gradient distributed town gas intelligent odorizing method and system |
| CN117432946B (en) * | 2023-12-19 | 2024-03-08 | 上海叁零肆零科技有限公司 | Simulation-combined gradient distributed town gas intelligent odorizing method and system |
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