CN110389602B - Method for controlling content of specific gas in target container - Google Patents
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- CN110389602B CN110389602B CN201810352166.8A CN201810352166A CN110389602B CN 110389602 B CN110389602 B CN 110389602B CN 201810352166 A CN201810352166 A CN 201810352166A CN 110389602 B CN110389602 B CN 110389602B
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 52
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 44
- 239000001301 oxygen Substances 0.000 claims description 44
- 229910052760 oxygen Inorganic materials 0.000 claims description 44
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
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Abstract
The invention provides a method for controlling the content of a specific gas in a target container, which comprises the following steps: the method comprises the following steps: detecting the content of the specific gas in the target container through a detector; step two: when the detection value of the detector reaches a first preset value, a first diluent gas pipeline is started to convey diluent gas into the target container; step three: when the detection value of the detector reaches a second preset value, a second diluent gas pipeline is started to convey diluent gas into the target container; wherein the first predetermined value is less than the second predetermined value and the flow rate of the first dilution gas line is less than the flow rate of the second dilution gas line.
Description
Technical Field
The present invention relates to protection of equipment with large fluctuations in gas content, and in particular to a method for controlling the content of a specific gas in a target container.
Background
In the production process of petrochemical enterprises, various combustible gases, combustible liquids or combustion-supporting gases can be generated. Combustible gases and combustible liquids are also commonly used in large quantities as raw materials. As for combustible gas, an explosion limit exists, and the combustible gas cannot be exploded when the explosion limit is lower, so that the safe use can be ensured. For the "fuel-oxygen-inert gas" ternary mixed gas system, there is a limit value of the oxygen content, and as long as the oxygen content in the system is below the limit value, no matter how the contents of the other two components change, the oxygen content cannot enter the explosion region, which is called the maximum allowable oxygen content of the system. If the content of various gases is controlled improperly, combustible gas and combustible steam can cause explosion, which can cause serious damage to surrounding buildings, equipment and the like and personal injury. In order to prevent gas-phase explosion, the content of combustible gas is usually controlled to be below the explosion limit or the oxygen content is controlled to be below the maximum allowable oxygen content, that is, the content of combustible gas or the content of oxygen is controlled by introducing a diluent gas to avoid explosion.
For some equipment or processes, the content of specific gas is generally controlled by introducing diluent gas, the variation of the introduced amount of the diluent gas is relatively small when the fluctuation of the content of combustible gas or oxygen is relatively small, and only one diluent gas pipeline and a regulating valve are generally required to meet the requirement. For example, in order to ensure safety of a combustible liquid storage tank, the content of oxygen in the storage tank needs to be controlled by introducing inert gas, the introduction amount of the inert gas is almost fixed and slightly fluctuates, and an inert gas pipeline and a regulating valve are installed above the storage tank.
However, many processes, equipments or devices are affected by the process conditions, external environment or raw materials, and the oxygen content or combustible gas content changes greatly, especially for the equipments involved in the reaction, and the explosion risk is caused when the control is not good under special working conditions. Particularly, in the process using the liquid oxidant, the oxidant can be decomposed to release oxygen, the controllability is relatively poor, and great potential safety hazards exist. For example, the green epichlorohydrin process is a process for preparing epichlorohydrin by directly oxidizing chloropropene with hydrogen peroxide. Mixing hydrogen peroxide and chloropropene, feeding the mixture into a reactor, and feeding the product after reaction into a gas-liquid separation tank. Since the hydrogen peroxide is easy to decompose and can generate oxygen, a small amount of the hydrogen peroxide remaining in the reactant and the product can be decomposed in the reactor and the gas-liquid separation tank to generate oxygen, and an explosive mixture is formed with combustible gas in the upper space of the gas-liquid separation tank. However, the decomposition of hydrogen peroxide itself is affected by various factors, and uncertainty exists. During normal production, the decomposition speed of the hydrogen peroxide is not changed greatly, and the flow of the inert gas pipeline can be slightly adjusted according to the fluctuation of the oxygen content in the gas-liquid separation tank. However, under abnormal working conditions, the hydrogen peroxide is decomposed violently to generate a large amount of oxygen, and the adjusting effect is not large at the moment. This is mainly because hydrogen peroxide is unstable and is greatly affected by factors such as alkali, temperature, metal ions, and the like. Under an abnormal working condition, hydrogen peroxide is decomposed in a large amount and generates a large amount of oxygen, a common inert gas pipeline cannot meet the purging requirement of the process, and the oxygen content in the gas-liquid separation tank cannot be adjusted rapidly, so that the adjustment of the gas-phase oxygen content is delayed, and a huge burning and explosion risk exists.
In addition, the high flow under special working conditions requires that the flow of the diluent gas is controlled to react quickly and has high flow, and the required instantaneous diluent gas flow far exceeds the maximum flow. However, the use of a large number of controllers is not accurate enough for routine control, resulting in waste of diluent gas.
Disclosure of Invention
In view of at least some of the technical problems described above, the present invention aims to provide a method for controlling the content of a specific gas in a target container. According to the method, the content of the specific gas in the target container is controlled by arranging different dilution gas pipes and control valves, and the method can timely respond and rapidly change the flow of the dilution gas in the dilution gas pipeline, so that the content of the specific gas in the target container is rapidly reduced, the explosion risk is greatly reduced, and the production safety is ensured.
To this end, according to the present invention, there is provided a method for controlling the content of a specific gas in a target container, comprising the steps of:
the method comprises the following steps: detecting the content of the specific gas in the target container through a detector;
step two: when the detection value of the detector reaches a first preset value, a first diluent gas pipeline is started to deliver diluent gas into the target container;
step three: when the detection value of the detector reaches a second preset value, a second diluent gas pipeline is started to deliver diluent gas into the target container;
wherein the first predetermined value is less than the second predetermined value and the flow rate of the first dilution gas line is less than the flow rate of the second dilution gas line.
In a preferred embodiment, said first predetermined value is set to 40-60% of the safety threshold.
In a preferred embodiment, said second predetermined value is set to 70-95% of the safety threshold value.
In a preferred embodiment, a regulating valve connected to the detector is provided in the first diluent gas line, and the regulating valve is a mass flow meter.
In a preferred embodiment, the mass flow meter is configured to be started after the detected value reaches a first predetermined value and to be closed after the detected value falls below the first predetermined value, and the opening degree of the mass flow meter at the time of start is 20 to 50%.
In a preferred embodiment, a control valve connected to the detector is provided in the second dilution gas line, said control valve being a quick-opening valve.
In a preferred embodiment, the quick-open valve is set to be activated after the detected value reaches the second predetermined value and to be closed after the detected value falls below the first predetermined value, and the activation time of the quick-open valve is set to be less than 0.1 second.
In a preferred embodiment, the diluent gas in the first and second diluent gas lines is the same, and the diluent gas is an inert gas or an alkane gas.
In a preferred embodiment, the target container is a gas-liquid separation tank, substances in the gas-liquid separation tank are reactants of raw materials and hydrogen peroxide serving as an oxidant, the specific gas is oxygen, and the diluent gas is nitrogen.
In a preferred embodiment, the oxygen content in the knock-out tank is controlled to be below 50% of a safety threshold.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows a schematic configuration of an apparatus in a method for controlling the content of a specific gas in a target container according to the present invention.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
According to the present invention, there is provided a method for controlling the content of a specific gas in a target container 20 by using an apparatus 100 for controlling the content of a specific gas in a target container 20. Fig. 1 shows a schematic diagram of the structure of the apparatus 100. As shown in fig. 1, the apparatus 100 includes a front-end device 10, and the front-end device 10 is connected to a target container 20 through a pipeline. The raw materials for production are reacted with the corresponding oxidizing agent in the front-end equipment 10 to carry out primary production. The product of the reaction in the front-end apparatus 10 enters the target container 20. The target vessel 20 is used to separate the gas phase from the liquid phase in the product. In one embodiment, the pre-apparatus is a reactor and the target vessel is a knock-out pot.
In the present embodiment, a gas discharge line 80 and a liquid discharge line 90 are connected to the target container 20. A gas discharge line 80 is connected to an upper end of the target container 20 for discharging the gas separated in the target container 20, and a liquid discharge line 90 is connected to a lower end of the target container 20 for discharging the liquid separated in the target container 20.
In the present embodiment, the target container 20 is made of a special material, so that the target container 20 has good storage properties and sealing properties. In the process of gas-liquid separation of the target container 20, due to some process condition changes or material instability, the content of some specific components in the target container 20 changes in special cases, which can cause the content of the specific components to exceed the safety limit value, thereby causing explosion and having serious safety hazard. Therefore, the contents of the respective components in the target container 20, particularly the contents of some specific gases capable of causing explosion, are strictly controlled.
According to the present invention, a pipeline is connected to the target container 20. As shown in fig. 1, the lines include a first dilution gas line 30. Normally, the flow of dilution gas in the first dilution gas line 30 is relatively stable and the flow is relatively low. In the present embodiment, a regulating valve 40 is provided in the first dilution gas line 30. The adjusting valve 40 is used for adjusting the flow of the diluent gas in the first diluent gas pipe, so that the content of the specific gas in the diluent gas-liquid separation tank 20 is reduced, the explosion risk is effectively reduced, and the safety performance of the production equipment is improved.
In the present embodiment, the regulating valve 40 in the first dilution gas line 30 is set as a mass flow meter. The mass flowmeter is set to start after the detection value reaches a preset value, and the opening degree during starting is set to be 20-50% so as to meet the flow requirement under normal conditions. Normally, the mass flow meter is capable of automatically adjusting its opening to control the flow in the first dilution gas line 30 for dilution. The mass flowmeter sets a starting value according to requirements. Under normal conditions, when the content of the specific gas in the target container 20 reaches the set value, the mass flow meter automatically adjusts the opening degree to change the flow rate of the first dilution gas pipeline, and the dilution gas is delivered to the target container 20 to reduce the content of the specific gas in the target container 20. The mass flow meter effectively achieves control of the content of the specific gas in the target container 20.
To handle the high flow requirements of the particular operating conditions, the line also includes a second diluent gas line 60 connected to the target vessel 20. As shown in fig. 1, a control valve 70 is provided in the second dilution gas line 60. The second diluent gas line 60 can satisfy the requirement of instantaneous diluent gas flow being high and ensure rapid reaction and control of the diluent gas flow.
In this embodiment, the diameter of the second diluent gas line 60 is determined according to the type of diluent gas, the reaction rule of the reactants in the pre-apparatus 10, the process conditions, and other factors. Through calculation, the pipe diameter of the second dilution gas pipeline 60 is determined, so that the content of the specific gas can be sufficiently, effectively and quickly controlled, and the safety performance of the production equipment is further improved.
In a preferred embodiment, the control valve 70 connected in the second dilution gas line 60 is arranged as a quick-opening valve. Under special conditions, the quick-opening valve sets a starting value according to requirements, the quick-opening valve is quickly started when the content of the specific gas in the gas-liquid separator tank 20 reaches the set value, the diluent gas is conveyed to the target container 20 at a high flow rate to quickly reduce the content of the specific gas in the target container 20, and the quick-opening valve is quickly closed when the content of the specific gas in the target container 20 is lower than the set value. In a preferred embodiment, the start time of the quick-opening valve is set to be less than 0.1 second, which enables a quick response, quick start, and thus a reduction in the lag time for dilution of the specific gas. The quick-opening valve ensures that the device 100 can quickly control the content of the specific gas, reduces the burning and explosion risks of the gas and reduces the occurrence of explosion accidents.
According to the present invention, the apparatus 100 further comprises a detector 50 for detecting the content of the specific gas within the target container 20. As shown in FIG. 1, the monitor 50 is connected to the regulator valve 40 and the control valve 70, respectively. The detector 50 is used to detect the content of the specific gas in the gas-liquid separator tank 20. The specific gas content control value is different under different situations or processes. The detecting instrument 50 can accurately measure and monitor the content of the specific gas in the gas-liquid separator tank 20 in time, and can timely transmit the detected parameters to the regulating valve 40 connected to the first dilution gas line 30 and the control valve 70 connected to the second dilution gas line 60. So that the regulating valve 40 and the control valve 70 can respond quickly and control the flow rate of the diluent gas in time, thereby effectively controlling the content of the specific gas in the gas-liquid separator tank 20 to be within a safe range.
According to the invention, the regulating valve 40 in the first dilution air line 30 and the control valve 70 in the second dilution air line 60 are each arranged to be activated after the detection value of the detector 50 has reached a respective predetermined value. The regulating valve 40 is arranged to be activated when the detected value reaches a first predetermined value, and the control valve 70 is arranged to be activated when the detected value reaches a second predetermined value, wherein the first predetermined value is smaller than the second predetermined value. In one embodiment, the first predetermined value is preferably set to a safety threshold, i.e. 40% -60% of the maximum allowable oxygen content, and the second predetermined value is preferably set to 70% -95% of the maximum allowable oxygen content. Thus, under normal conditions, the amount of the specific gas in the target vessel 20 does not vary much, and can be adjusted slightly by the adjustment valve 40 in the first diluent gas line 30. Under special conditions, the specific gas in the target container 20 is unstable and its content varies greatly, and at this time, the content of the specific gas in the target container 20 can be controlled quickly and effectively by the control valve 70 in the second diluent gas line 60.
According to the invention, normally open with 20-50% opening of the mass flow meter in the first dilution gas line 30 maintains normal purge dilution, while the quick-opening valve in the second dilution gas line 60 is normally closed. In a special emergency situation, the quick-opening valve in the second dilution gas line 60 will open quickly and remain fully open, achieving a large flow of quick dilution to quickly reduce the content of the specific gas in the target container 20. Thereby, the fractional dilution of the content of the specific gas in the target container 20 is realized, thereby improving the control accuracy and dilution efficiency of the content of the specific gas in the target container 20.
The workflow of the method of controlling the content of a specific gas within a target container 20 is discussed in detail below with respect to fig. 1. In this method, first, the content of the specific gas in the target container 20 is detected by the detector 50. The application scenario considered when the device design equipment is selected is that the mass flow meter opening in the first dilution gas line 30 is in a normally open state of 20-50% to maintain normal purge dilution, while the quick-opening valve in the second dilution gas line 60 is in a normally closed state. When the detection value of the detector 50 reaches a first predetermined value, the mass flow meter in the first dilution gas line 30 is started and automatically adjusted to change the flow rate of the first dilution gas line 30 to dilute the specific gas in the target container 20. When the detection value of the detector 50 reaches a second predetermined value in an emergency situation, the quick-opening valve in the second diluent gas line 60 is quickly activated to deliver a large flow of diluent gas into the target container 20 to quickly dilute the specific gas content in the target container 20. The method provides for the normal dilution of the particular gas in the target vessel 20 by automatically changing the opening of the mass flow meter in the first dilution gas line 30. When the detection value of the detector 50 reaches a second predetermined value, the second dilution gas line 60 is automatically started to perform special-case rapid dilution on the specific gas in the target container 20.
According to the method for controlling the content of the specific gas in the target container 20 of the present invention, the regulating valve 40 performs flow regulation according to the detected value versus the control value under the conventional condition, thereby ensuring that the content of the specific gas is lower than the control value. The detector 50 sends the detected parameters quickly to the regulating valve 40 in the first dilution air line 30. The regulating valve 40 automatically adjusts the flow rate of the diluent gas controlled by the regulating valve 40 according to the content of the specific gas in the target container 20 detected by the detector 50, so as to rapidly reduce the content of the specific gas in the target container 20 and control the content thereof within a safe range.
Under special working conditions, the flow of the diluent gas is required to be very high, and the required instantaneous diluent gas flow far exceeds the maximum flow. The detector 50 sends the detected parameter quickly to the control valve 70 in the second diluent gas line 30. The control valve 70 responds quickly and automatically adjusts the flow rate of the dilution gas controlled by the control valve 70 according to the content of the specific gas in the target container 20 detected by the detector 50, so as to reduce the content of the specific gas in the target container 20 quickly and control the content within a safe range. The control valve 70 can effectively prevent explosion caused by the content of the specific gas reaching a limit value, and reduce the occurrence of explosion accidents. At the same time, the second dilution gas line 60 and the control valve 70 can respond quickly. Under the demand of satisfying the high flow, can quick response and control specific gaseous content, avoided chooseing for use a large amount of controllers to it is extravagant to the not enough dilution gas that causes of daily control precision.
According to the invention, the same diluent gas is used for the diluent gases in the first diluent gas line 30 and in the second diluent gas line 60, but it is of course also possible to use different diluent gases. In the present invention, the diluent gas for controlling the content of the specific gas is an inert gas, an alkane gas or the like. For example, the diluent gas may be nitrogen, carbon monoxide, carbon dioxide, argon, helium, small alkanes, and the like.
The operation of the method for controlling the content of a specific gas in a target container according to the present invention will be briefly described below, taking an epoxidation apparatus using hydrogen peroxide as an oxidant as an example. As shown in fig. 1, the pre-apparatus 10 serves as a reactor in the process, and the target vessel 20 is a gas-liquid separation tank. In the process, the content is required to be controlledThe fixed gas is oxygen. The directions indicated by the arrows in fig. 1 are the flow directions of the raw material gas or liquid, and the diluent gas. The raw materials react with hydrogen peroxide as an oxidant in a reactor, and the product after the reaction enters a gas-liquid separation tank. Since the self-decomposition of the hydrogen peroxide is influenced by various factors, the hydrogen peroxide is unstable and can be self-decomposed easily to generate oxygen, and especially when the hydrogen peroxide reacts with organic matters, the organic matters in a gas phase space are mixed with the oxygen released by the decomposition of the hydrogen peroxide to cause the risk of explosion. Therefore, in the production process using hydrogen peroxide as an oxidant, it is important to slow down the self-decomposition of hydrogen peroxide and control the gas-phase space oxygen content. The maximum allowable oxygen content test is carried out by utilizing the detonation tube, the maximum oxygen content which ensures that gas-phase combustion explosion does not occur in the gas-liquid separation tank is 4% through experiment measurement, in order to ensure the process safety, the oxygen content in the running process of the device is required to be controlled below 2%, and nitrogen is used as diluent gas. The nitrogen flow in line 30 during steady operation of the plant was 40Nm calculated from process simulations on a scale of the existing process 3 About/h, at the moment, the oxygen content in the gas-liquid separation tank can be ensured to be below 2 percent. Under normal conditions, the self-decomposition speed of the hydrogen peroxide generally does not change greatly. The flow of diluent gas in the first diluent gas line 30 is slightly adjusted by the adjustment valve 40 in response to fluctuations in the oxygen content detected by the oxygen content detector 50. Therefore, the oxygen content in the gas-liquid separation tank is detected and controlled at any time, and the burning explosion risk of the mixture in the gas-liquid separation tank is reduced.
Under special conditions, for example, the failure of cooling the reactor leads to temperature runaway or metal ions mixed in other raw materials, so that the decomposition of hydrogen peroxide is accelerated to lead to the sharp increase of the oxygen content. The oxygen content in the gas-liquid separation tank under different instantaneous hydrogen peroxide decomposition amounts can be seen in table 1. According to the hydrogen peroxide decomposition rule and the process conditions, the maximum instantaneous decomposition rate of the hydrogen peroxide is simulated and estimated, and the design value of the pipe diameter of the second dilution gas pipeline 60 is calculated according to the maximum instantaneous increase rate of the hydrogen peroxide content. The tube diameter of the second dilution gas line 60 should be 25mm calculated using ASPEN simulations. And the control valve 70 in the second dilution air line 60 is set to a quick-open valve, the start value of which is set to 3%. Therefore, when the value detected by the oxygen content detector 50 reaches 3%, the quick-opening valve is quickly started, nitrogen is input into the target container 20 at a high flow rate to quickly reduce the oxygen content, and gas phase explosion caused by the fact that the oxygen content exceeds a limit value is avoided. And when the value detected by the oxygen content detector 50 is lower than 2%, the quick-opening valve is closed quickly. Therefore, in the production process, the oxygen content in the target container 20 is effectively controlled to be below 2 percent through the second diluent gas pipeline 60 and the quick-opening valve, gas phase explosion caused by the fact that the oxygen content exceeds a limit value is effectively avoided, and the production safety performance is improved.
TABLE 1 oxygen content in gas-liquid separation tank under different instantaneous hydrogen peroxide decomposition
According to the method for controlling the gas content of the present invention, it is possible to constantly detect the content of the specific gas in the target container 20 by the detector 50. The detector 50 can transmit information to the control valve 70 and the regulating valve 40 in the dilution line in a quick and timely manner when the content of the specific gas suddenly rises, so that the flow rate of the dilution gas in the dilution line can be changed quickly, the content of the specific gas in the target container 20 can be reduced quickly, and the explosion risk can be reduced. In addition, second dilution gas pipeline 60 is satisfying under the requirement of high flow, can the specific gaseous content of rapid control, has avoided chooseing for use a large amount of controllers, has reduced the waste of the dilution gas that causes inadequately to the daily control precision, has practiced thrift manufacturing cost. Meanwhile, the device 100 has a simple structure and low manufacturing cost.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for controlling the level of a specific gas within a target vessel, comprising the steps of:
the method comprises the following steps: detecting the content of the specific gas in the target container through a detector (50);
step two: when the detection value of the detector reaches a first preset value, a first dilution gas pipeline (30) is started to deliver dilution gas into the target container;
step three: when the detection value of the detector reaches a second preset value, a second dilution gas pipeline (60) is started to deliver dilution gas into the target container;
wherein the first predetermined value is less than the second predetermined value and the flow rate of the first dilution gas line is less than the flow rate of the second dilution gas line,
a regulating valve (40) connected with the detector is arranged in the first dilution gas pipeline, the regulating valve is a mass flow meter, the mass flow meter is set to be started after a detection value reaches a first preset value and to be closed after the detection value is lower than the first preset value,
a control valve (70) connected to the detector is arranged in the second dilution air line, the control valve is a quick-opening valve which is set to be started when the detection value reaches a second preset value and is closed when the detection value is lower than a first preset value,
the dilution gas in the first and second dilution gas lines is the same,
the target container is a gas-liquid separation tank, substances in the gas-liquid separation tank are reactants of raw materials and hydrogen peroxide serving as an oxidant, and the specific gas is oxygen.
2. The method of claim 1, wherein the first predetermined value is set to 40-60% of a safety threshold.
3. The method of claim 1, wherein the second predetermined value is set to 70-95% of a safety threshold.
4. The method of claim 1, wherein the mass flow meter is started with an opening of 20-50%.
5. The method according to claim 1, characterized in that the start-up time of the quick-opening valve is set below 0.1 seconds.
6. The method according to any one of claims 1 to 5, wherein the diluent gas is an inert gas or an alkane gas.
7. The method according to any one of claims 1 to 5, wherein the diluent gas is nitrogen.
8. The method of claim 7, wherein the oxygen content in the knock-out tank is controlled to be below 50% of a safe threshold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810352166.8A CN110389602B (en) | 2018-04-19 | 2018-04-19 | Method for controlling content of specific gas in target container |
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| CN201810352166.8A CN110389602B (en) | 2018-04-19 | 2018-04-19 | Method for controlling content of specific gas in target container |
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| CN111265698B (en) * | 2020-03-10 | 2020-08-18 | 江苏苏云医疗器材有限公司 | Gas flow adjusting device |
| CN114459561A (en) * | 2020-11-10 | 2022-05-10 | 中国石油天然气股份有限公司 | Air volume measuring and calculating method and early warning method for near explosion of combustible mixed gas |
| CN117452866B (en) * | 2023-12-22 | 2024-03-22 | 中信戴卡股份有限公司 | Dynamic intelligent control method for aluminum alloy refining |
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Effective date of registration: 20240317 Address after: No. 22, Chaoyangmen street, Chaoyang District, Beijing 100020 Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Country or region after: China Patentee after: Sinopec Safety Engineering Research Institute Co.,Ltd. Address before: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Country or region before: China Patentee before: SINOPEC Research Institute OF SAFETY ENGINEERING |