CN114377612A - Automatic control method for product purification process - Google Patents
Automatic control method for product purification process Download PDFInfo
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- CN114377612A CN114377612A CN202111656297.3A CN202111656297A CN114377612A CN 114377612 A CN114377612 A CN 114377612A CN 202111656297 A CN202111656297 A CN 202111656297A CN 114377612 A CN114377612 A CN 114377612A
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- vacuum
- vacuum pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D59/00—Separation of different isotopes of the same chemical element
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
Abstract
The invention belongs to the technical field of isotope separation, and particularly relates to an automatic control method for a product purification process. The invention comprises the following steps: step 1, setting a process system; step 2, controlling a purification process; step 3, starting to evacuate; and 4, stopping vacuumizing. The invention avoids human intervention in the product purification process, realizes human error prevention in the product purification process, and reduces the labor cost in the product purification process.
Description
Technical Field
The invention belongs to the technical field of isotope separation, and particularly relates to an automatic control method for a product purification process.
Background
As shown in fig. 1, the purified gas stream in the product purification process of the H fuel manufacturing plant made in the current industry contains product, HF, air, and the product must be trapped in an intermediate container to ensure that the material content in the HF-collecting freezer is below the 100g/1kgHF standard.
In the prior art, the following process is adopted for purification: firstly, when the pressure of a working container reaches 16kPa, manually opening a purification hand valve at the outlet of the working container to balance the pressure in the working container to a buffer container, ensuring no leakage of the buffer container, and closing the purification hand valve at the outlet of the working container after the pressure release time is (7-10) min; secondly, after the purified air flow is balanced in the buffer container for 10min, manually setting an electric regulating valve of the purification pipeline to be in an automatic 0% state, wherein sv is lower than 800 Pa; thirdly, the buffer container, the electric regulating valve, the two-stage intermediate container, the freezer and the air big tank are manually communicated on site; fourthly, after purification is finished, manually setting the electric regulating valve to be in a manual 0% state; and fifthly, manually closing a hand valve at the outlet of the freezer, starting a vacuum pump on site to evacuate the air big tank, discharging tail gas into an exhaust system, and stopping the pump on site after evacuation is finished.
The prior art has the following defects: firstly, manually monitoring the inlet pressure of a working container in real time, and checking and judging the purification condition; secondly, each step of operation needs on-site manual operation, the process is complex, and the labor cost is high; and the automation control level is low.
Disclosure of Invention
The invention aims to provide an automatic product purification control method, which avoids human intervention in the product purification process, prevents human errors in the product purification process and reduces the labor cost in the product purification process.
The technical scheme adopted by the invention is as follows:
an automatic control method for a product purification process comprises the following steps: step 1, setting a process system; step 2, controlling a purification process; step 3, starting to evacuate; and 4, stopping vacuumizing.
In the step 1, remote transmission type vacuum pressure gauges are arranged on the inlet of the product receiving working container, the inlet of the intermediate container, the air big tank and the inlet of the vacuum pump and can be transmitted to a DCS (distributed control System); an electric vacuum stop valve is arranged at the outlet of the product receiving working container, the outlet of the buffer container, the outlet of the freezer and the inlet of the vacuum pump, and can be remotely controlled to be opened and closed in a DCS (distributed control system); an electric regulating valve is arranged on the inlet main pipe of the intermediate container, and the opening degree can be remotely controlled in a DCS; the vacuum pump has the function of starting and stopping the DCS through remote control.
The step 2 comprises the following steps:
step 2.1, setting a product purification control button of the DCS into a remote control state;
step 2.2, setting initial conditions: when the DCS system acquires that the inlet pressure of the working container is larger than 16kPa, triggering an automatic control procedure of the product purification process;
step 2.3, the DCS checks whether the parameters of the purification system meet the purification conditions; if the conditions are met, entering the step 2.6; if the condition is not met, entering the step 2.4;
step 2.4, stopping product purification, and sending out a sound alarm signal by a control room DCS;
step 2.5, checking the unsatisfied reason on site, and restarting product purification control after elimination;
and 2.6, releasing the pressure in the working container to the interior of the buffer container for balancing: controlling to open an outlet electrovalve of the working container and an outlet electrovalve of the buffer container, and communicating the working container with the buffer container; controlling to close the outlet pressure of the working container after releasing for 7min, and stopping releasing the pressure of the working container; the released pressure is balanced and kept stand for 40min in a buffer container;
and 2.7, communicating the buffer container to a purification pipeline of the intermediate container, the freezer and the vacuum large tank: the electric regulating valve is set to be 0%, the inlet pressure of the intermediate container is controlled to be less than 600-800 Pa according to the control of the electric regulating valve, the electric regulating valve is opened slowly to communicate the buffer container with the purification pipelines of the intermediate container, the freezer and the vacuum big tank, and the pressure in the buffer container is controlled to be below 800Pa by the electric regulating valve and enters the intermediate container, the freezer and the vacuum big tank in sequence;
in the purification process, if the pressure of the air large tank is judged to be larger than 300Pa, evacuation is carried out;
if the state of the electric regulating valve is 100 percent of the opening, the pressure in the buffer container is purified and ended, and the step 2.8 of evacuating is simultaneously carried out;
step 2.8, cutting off a pipeline from the buffer container to the intermediate container: controlling the state of the electric regulating valve to be 0% of opening; and controlling to close the electric valve at the outlet of the buffer container.
In the step 2.3, the condition is that the opening of the electric regulating valve is checked to be in a manual 0% state, and the cleaning pipeline is determined to be cut off; checking that the pressure in the buffer container is less than or equal to 3kPa, and determining the vacuum degree of the buffer container; the intermediate vessel inlet pressure was checked for < 200Pa and the vacuum level of the purge line was determined.
The purification end evacuation control includes the steps of: when the opening of the electric regulating valve is 100%, controlling to close the electric regulating valve, the outlet electrovalve of the buffer container and the outlet electrovalve of the freezer, and cutting off a purification line; when the electric valve at the outlet of the freezer is closed, controlling to start a vacuum pump to run, opening the electric valve at the inlet of the vacuum pump to communicate with an evacuation line, evacuating and exhausting the vacuum tank, and keeping the air tank vacuum; and (5) after the time sequence control is performed for 5min, controlling to close the electric valve at the inlet of the vacuum pump, stopping the operation of the vacuum pump, opening the electric valve at the outlet of the freezer, stopping evacuation and communicating a purification pipeline.
The evacuation control in the purification process comprises the following steps: when the pressure of the vacuum big tank is collected to be more than 300Pa, an electric valve at the outlet of the freezer is controlled, and a purification line is cut off; when the electric valve at the outlet of the freezing device is closed, controlling to start the vacuum pump to run, opening the electric valve at the inlet of the vacuum pump to communicate with an evacuation line, evacuating and exhausting the vacuum tank, and keeping the air tank vacuum; and (5) after the time sequence control is performed for 5min, controlling to close the electric valve at the inlet of the vacuum pump, stopping the operation of the vacuum pump, opening the electric valve at the outlet of the freezer, stopping evacuation and communicating a purification pipeline.
The step 3 comprises the following steps: closing an electric valve at the outlet of the freezer, and disconnecting a pipeline between the freezer and the vacuum large tank; controlling and starting the vacuum pump to operate; when the inlet pressure of the vacuum pump is judged to be less than or equal to 200Pa, controlling to open a front electrovalve of the vacuum pump, communicating the vacuum pump to a pipeline of a large air tank, and evacuating the large vacuum tank;
the step 4 comprises the following steps: after the vacuum pump is judged to run for 5min, firstly controlling to close a front electrovalve of the vacuum pump, and cutting off the vacuum pump to an air big tank pipeline; then controlling the vacuum pump to stop running, and finishing evacuation; and controlling to open an electric valve at the outlet of the freezer and communicating a pipeline between the freezer and the vacuum tank.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the automatic product purification control method provided by the invention, human intervention in the product purification process is avoided, human errors in the product purification process are prevented, and the labor cost in the product purification process is reduced;
(2) the automatic purification control method for the product improves the automatic purification control level and ensures the correctness of operation.
Drawings
FIG. 1 is a flow diagram of a prior art product purification process;
FIG. 2 is a flow chart of the product purification process control provided by the present invention;
in the figure: 1-working container, 2-purified air flow, 3-buffer container, 4-electric regulating valve, 5-primary intermediate container, 6-secondary intermediate container, 7-freezer, 8-air large tank and 9-vacuum pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 2, the automatic control method for the product purification process provided by the invention comprises the following steps:
Step 2, purification process control: when the DCS acquires that the inlet pressure of a product receiving working container is greater than 16kPa, opening an electric vacuum stop valve at the outlet of the working container and an electric vacuum stop valve at the outlet of the buffer container according to the opening of an electric regulating valve, the pressure of the buffer container and the inlet pressure of a middle container are controlled, balancing the pressure in the working container to the buffer container, and controlling to close an electric valve at the outlet of the working container after 7min of time sequence control; after the buffer container balances the purified air flow for 40min according to time sequence control, the inlet pressure of the middle container is controlled to be 600-800 Pa by an electric regulating valve.
Example 2
The invention provides an automatic control method for a product purification process, which comprises the following steps:
step 2, setting initial conditions: when the DCS system acquires that the inlet pressure of the working container is larger than 16kPa, triggering the automatic control of the product purification process;
if the conditions are met, entering step 6; if the condition is not met, entering the step 4;
and 6, releasing the pressure in the working container into a buffer container for balancing: controlling to open an outlet electrovalve of the working container and an outlet electrovalve of the buffer container, and communicating the working container with the buffer container; controlling to close the outlet pressure of the working container after releasing for 7min, and stopping releasing the pressure of the working container; the released pressure is balanced and kept stand for 40min in a buffer container;
and 7, communicating the buffer container with a purification pipeline of the intermediate container, the freezer and the vacuum large tank: the electric regulating valve is set to be 0%, the inlet pressure of the intermediate container is controlled to be less than 800Pa according to the control of the electric regulating valve, the electric regulating valve is slowly opened to communicate the buffer container with the purification pipelines of the intermediate container, the freezer and the vacuum big tank, and the pressure in the buffer container is controlled to be less than 800Pa by the electric regulating valve and sequentially enters the intermediate container, the freezer and the vacuum big tank;
in the purification process, if the pressure of the air big tank is judged to be larger than 300Pa, entering step 9;
if the state of the electric regulating valve is 100 percent of the opening, the pressure in the buffer container is purified and ended, and the step 8 and the step 9 are simultaneously carried out;
and 8, cutting off a pipeline from the buffer container to the intermediate container: controlling the state of the electric regulating valve to be 0% of opening; controlling to close an electric valve at the outlet of the buffer container;
step 10: stopping evacuation: after the vacuum pump is judged to run for 5min, firstly controlling to close a front electrovalve of the vacuum pump, and cutting off the vacuum pump to an air big tank pipeline; then controlling the vacuum pump to stop running, and finishing evacuation; and controlling to open an electric valve at the outlet of the freezer and communicating a pipeline between the freezer and the vacuum tank.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. An automatic control method for a product purification process is characterized by comprising the following steps: the method comprises the following steps: step (1), setting a process system; step (2), controlling a purification process; step (3), starting to evacuate; and (4) stopping evacuation.
2. The automated control method of a product purification process according to claim 1, wherein: in the step (1), remote transmission type vacuum pressure gauges are arranged on the inlet of the product receiving working container, the inlet of the intermediate container, the air big tank and the inlet of the vacuum pump and can be transmitted to a DCS (distributed control System); an electric vacuum stop valve is arranged at the outlet of the product receiving working container, the outlet of the buffer container, the outlet of the freezer and the inlet of the vacuum pump, and can be remotely controlled to be opened and closed in a DCS (distributed control system); an electric regulating valve is arranged on the inlet main pipe of the intermediate container, and the opening degree can be remotely controlled in a DCS; the vacuum pump has the function of starting and stopping the DCS through remote control.
3. The automated control method of a product purification process according to claim 2, wherein: the step (2) comprises the following steps:
step (2.1), setting a product purification control button of the DCS into a remote control state;
step (2.2), setting initial conditions: when the DCS system acquires that the inlet pressure of the working container is larger than 16kPa, triggering an automatic control procedure of the product purification process;
step (2.3), the DCS checks whether the parameters of the purification system meet the purification conditions; if the conditions are met, entering the step (2.6); if the condition is not met, entering the step (2.4);
step (2.4), stopping product purification, and sending out a sound alarm signal by a control room DCS;
step (2.5), checking the unsatisfied reason on site, and restarting product purification control after elimination;
and (2.6) releasing the pressure in the working container to the interior of the buffer container for balancing: controlling to open an outlet electrovalve of the working container and an outlet electrovalve of the buffer container, and communicating the working container with the buffer container; controlling to close the outlet pressure of the working container after releasing for 7min, and stopping releasing the pressure of the working container; the released pressure is balanced and kept stand for 40min in a buffer container;
and (2.7) communicating the buffer container with a purification pipeline of the intermediate container, the freezer and the vacuum large tank: the electric regulating valve is set to be 0%, the inlet pressure of the intermediate container is controlled to be less than 600-800 Pa according to the control of the electric regulating valve, the electric regulating valve is opened slowly to communicate the buffer container with the purification pipelines of the intermediate container, the freezer and the vacuum big tank, and the pressure in the buffer container is controlled to be below 800Pa by the electric regulating valve and enters the intermediate container, the freezer and the vacuum big tank in sequence;
in the purification process, if the pressure of the air large tank is judged to be larger than 300Pa, evacuation is carried out;
if the state of the electric regulating valve is 100 percent of the opening, the pressure in the buffer container is purified and finished, and the step (2.8) and the evacuation are simultaneously carried out;
step (2.8), cutting off the pipeline from the buffer container to the intermediate container: controlling the state of the electric regulating valve to be 0% of opening; and controlling to close the electric valve at the outlet of the buffer container.
4. The automated control method of a product purification process according to claim 3, wherein: in the step (2.3), the condition is that the opening degree of the electric regulating valve is checked to be in a manual 0% state, and the cleaning pipeline is determined to be cut off; checking that the pressure in the buffer container is less than or equal to 3kPa, and determining the vacuum degree of the buffer container; the intermediate vessel inlet pressure was checked for < 200Pa and the vacuum level of the purge line was determined.
5. The automated control method of a product purification process according to claim 4, wherein: the purification end evacuation control includes the steps of: when the opening of the electric regulating valve is 100%, controlling to close the electric regulating valve, the outlet electrovalve of the buffer container and the outlet electrovalve of the freezer, and cutting off a purification line; when the electric valve at the outlet of the freezer is closed, controlling to start a vacuum pump to run, opening the electric valve at the inlet of the vacuum pump to communicate with an evacuation line, evacuating and exhausting the vacuum tank, and keeping the air tank vacuum; and (5) after the time sequence control is performed for 5min, controlling to close the electric valve at the inlet of the vacuum pump, stopping the operation of the vacuum pump, opening the electric valve at the outlet of the freezer, stopping evacuation and communicating a purification pipeline.
6. The automated control method of a product purification process according to claim 4, wherein: the evacuation control in the purification process comprises the following steps: when the pressure of the vacuum big tank is collected to be more than 300Pa, an electric valve at the outlet of the freezer is controlled, and a purification line is cut off; when the electric valve at the outlet of the freezing device is closed, controlling to start the vacuum pump to run, opening the electric valve at the inlet of the vacuum pump to communicate with an evacuation line, evacuating and exhausting the vacuum tank, and keeping the air tank vacuum; and (5) after the time sequence control is performed for 5min, controlling to close the electric valve at the inlet of the vacuum pump, stopping the operation of the vacuum pump, opening the electric valve at the outlet of the freezer, stopping evacuation and communicating a purification pipeline.
7. The automated control method of a product purification process according to claim 6, wherein: the step (3) comprises the following steps: closing an electric valve at the outlet of the freezer, and disconnecting a pipeline between the freezer and the vacuum large tank; controlling and starting the vacuum pump to operate; and when the pressure at the inlet of the vacuum pump is judged to be less than or equal to 200Pa, controlling to open a front electrovalve of the vacuum pump, communicating the vacuum pump to a pipeline of the large air tank, and evacuating the large vacuum tank.
8. The automated control method of a product purification process according to claim 7, wherein: the step (4) comprises the following steps: after the vacuum pump is judged to run for 5min, firstly controlling to close a front electrovalve of the vacuum pump, and cutting off the vacuum pump to an air big tank pipeline; then controlling the vacuum pump to stop running, and finishing evacuation; and controlling to open an electric valve at the outlet of the freezer and communicating a pipeline between the freezer and the vacuum tank.
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| CN202111656297.3A CN114377612A (en) | 2021-12-31 | 2021-12-31 | Automatic control method for product purification process |
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| CN202111656297.3A CN114377612A (en) | 2021-12-31 | 2021-12-31 | Automatic control method for product purification process |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963460A (en) * | 1973-04-04 | 1976-06-15 | Licentia Patent-Verwaltungs-G.M.B.H. | Method and apparatus for treating waste gases containing radioactive impurities, particularly krypton and xenon nuclides |
| CN109646983A (en) * | 2018-12-07 | 2019-04-19 | 中核新能核工业工程有限责任公司 | A kind of protective device and method of Uranium enrichment plant's material container disassembling operations |
-
2021
- 2021-12-31 CN CN202111656297.3A patent/CN114377612A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963460A (en) * | 1973-04-04 | 1976-06-15 | Licentia Patent-Verwaltungs-G.M.B.H. | Method and apparatus for treating waste gases containing radioactive impurities, particularly krypton and xenon nuclides |
| CN109646983A (en) * | 2018-12-07 | 2019-04-19 | 中核新能核工业工程有限责任公司 | A kind of protective device and method of Uranium enrichment plant's material container disassembling operations |
Non-Patent Citations (2)
| Title |
|---|
| 石佳: "铀浓缩精料取料工艺研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 陈世强: "《中国核科学技术进展报告（第六卷）——中国核学会2019年学术年会论文集第4册（同位素分离分卷）》", 30 April 2020 * |
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