CN214793582U

CN214793582U - Helium purification equipment regeneration pressure monitoring devices

Info

Publication number: CN214793582U
Application number: CN202121133990.8U
Authority: CN
Inventors: 姜磊
Original assignee: Huaneng Shandong Shidaobay Nuclear Power Co Ltd
Current assignee: Huaneng Shandong Shidaobay Nuclear Power Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-11-19
Anticipated expiration: 2031-05-25

Abstract

The regenerating pressure monitoring device for helium purifying apparatus includes copper oxide bed, molecular sieve bed and low temperature adsorber in the loop of high temperature gas cooled reactor helium purifying system. Respectively adding a pressure monitoring device at the positions of the copper oxide bed, the molecular sieve bed and the vacuum gauge of the low-temperature adsorber, and sharing a source point and an instrument root valve with the vacuum gauge; the pressure monitoring device is connected with the monitoring center through a data bus. If 0KBE10/20CP003 fails in the helium purification system, the pressure monitoring and control of each equipment section can be carried out by using the helium purification equipment regeneration pressure monitoring device, so that the loop of the helium purification system is prevented from losing monitoring; the helium purification equipment regeneration pressure monitoring device can effectively ensure the helium purification regeneration process and can ensure that each equipment of the helium purification system is recovered to be in a usable state.

Description

Helium purification equipment regeneration pressure monitoring devices

Technical Field

The utility model relates to a monitoring devices especially relates to a helium clarification plant regeneration pressure monitoring devices.

Background

High temperature gas cooled reactor demonstration project (hereinafter referred to as HTR-PM) for reducing fuel consumption during normal operationCorrosion of components, graphite and other structural materials, meeting purity requirements of the HTR-PM on reactor coolant helium under normal operating conditions, controlling the level of chemical impurities in the helium, and therefore providing a helium purification system to remove harmful chemical impurities (H) from helium₂O、O₂、CO₂、CO、H₂、CH₄、N₂Etc.), tritium, and solid particles (mainly graphite dust).

The normal purification line of the HTR-PM helium purification system comprises a dust filter, an electric heater, a copper oxide bed, a pipeline filter, a medium-temperature helium/helium heat exchanger, a water/helium cooler, a normal gas/water separator, a molecular sieve bed, a low-temperature helium/helium heat exchanger, a low-temperature adsorber, a diaphragm compressor and the like. As shown in figure 1 below. During normal operation of the reactor, the helium purification system introduces helium to be purified from a high-pressure end (a primary helium fan outlet) of a primary loop coolant of the reactor, the helium enters a dust filter in a purification column to remove solid particle impurities, a subsequent electric heater can adjust the power of the heater to heat the helium to 250 ℃, and then the helium is sent to a copper oxide bed, and CO and H in the helium are carried out in the copper oxide bed₂Is oxidized into CO₂And H₂O and a small amount of oxygen react with the metal copper particles to generate CuO, so that the CuO is removed. After the helium gas is cooled to 10 ℃ by the medium temperature helium/helium heat exchanger, the water/helium cooler, condensed water is left in the gas/water separator, and then CO contained in the gas flows through the molecular sieve bed₂And H₂O is adsorbed. The concentrations of water and carbon dioxide were monitored before and after the molecular sieve bed. Helium gas leaving the molecular sieve bed flows through a low-temperature helium/helium heat exchanger to be cooled and enters a low-temperature adsorber, and N in the helium gas₂、Ar、CH₄And isotopes of Kr and Xe and the like are adsorbed by activated carbon in a low-temperature adsorber at low temperature. Thereafter, the cleaned helium gas is returned to the primary loop after being reheated by the low and medium temperature helium/helium heat exchangers. During normal reactor operation, helium flow in the normal purge train is driven by a primary helium circulator.

Before the reactor is started and after in-service inspection and maintenance, helium can be introduced from a primary loop for purification treatment, the helium purification flow is driven by a diaphragm compressor in a purification train, and an electric heater in front of a copper oxide bed can raise the helium from a lower temperature to 250 ℃.

After the helium purge train 1(0KBE10) or the purge train 2(0KBE20) is continuously operated for a certain period of time, the adsorbent and the conversion agent of the purge device may reach an operation saturation state to lose the purge function, and it is necessary to regenerate the purge train with the helium purge regeneration system (0KBH) to restore the purge function. The helium purge regeneration system has only one, and the regeneration of the two purge trains needs to be performed sequentially. The function of 0KBH is to regenerate the purification equipment of 0KBE, including the regeneration of the purification equipment of a normal purification train in turn and the regeneration of only a single purification equipment of a certain train. The purification equipment of the helium purification column and the regeneration column are connected through corresponding interfaces.

The regeneration of the helium purifying equipment is a technological process that the helium purifying regeneration system provides heated helium gas to heat the helium purifying equipment, so that the adsorbent in the purifying equipment is desorbed, the transforming agent is recovered, and the purifying capacity of the transforming agent is recovered. The copper in the copper oxide bed needs to be heated and oxidized into copper oxide by adding oxygen, and the molecular sieve bed and the active carbon adsorbent need to be heated and desorbed. The regeneration of the purification equipment is also carried out sequentially according to different processes of the purification equipment. The schematic flow diagram of the helium purge regeneration system is shown in FIG. 2 below.

The helium purification system comprises three main equipment sections, namely a copper oxide bed, a molecular sieve bed and a low-temperature adsorber, wherein only one pressure monitoring device, namely a vacuum gauge, exists in the three equipment sections at present, and the vacuum gauge is used for respectively vacuumizing the copper oxide bed, the molecular sieve bed and the low-temperature adsorber after the regeneration of the purification equipment is finished when the purification equipment is in a regeneration process. In the three equipment sections, vacuum gauges are respectively positioned on adjacent pipe sections after the copper oxide bed, the molecular sieve bed and the low-temperature adsorber to indicate the pressure when the equipment is vacuumized.

In current helium purification system designs, there is only one positive pressure transmitter in the helium purification system loop, where the pressure of the helium purification system cannot be monitored once the meter fails. Meanwhile, when the helium purification equipment is independently regenerated, the system cannot monitor the regeneration operation pressure of each equipment in the processes of pressure relief, helium filling and the like after each equipment is independently isolated. Especially in the execution of the regeneration sequence control process, the logic process cannot be automatically completed due to the lack of the operation pressure of the system equipment.

The working pressure of a primary loop of the demonstration project of the high-temperature gas cooled reactor is 7.0MPa, the temperature of the primary loop cold helium is 250 ℃, the helium purification system is communicated with the primary loop of the reactor during normal operation, the working pressure of the helium purification system is consistent with the pressure of the primary loop system, and the inlet temperature of the helium purification system is the same as the cold end temperature of a primary loop coolant.

At present, two rows of helium purification systems of a high-temperature gas cooled reactor are respectively provided with 10 pressure measuring points to respectively serve two reactors, taking normal purification 1 as an example, wherein 5 are differential pressure transmitters, 3 are vacuum gauges, 0KBE10CP003 and 0KBE10CP004 in the rest two helium purification system loops are positive pressure transmitters, but 0KBE10CP004 is used for measuring the pressure of a liquid nitrogen storage tank of a low-temperature adsorption section, and the measuring range is 0-0.4MPa (g), so that only 0KBE10CP003 is used for measuring the loop pressure of the whole helium purification system, the measuring range is 0-10MPa (g) and the positions are behind a steam-water separator and in front of a molecular sieve bed (not in a loop for isolating and regenerating the molecular sieve bed). Where the failure of the meter would result in the failure of the entire purification loop to be monitored and controlled.

In the regeneration process of each helium purification device, the normal purification train is isolated and decompressed, and a copper oxide bed, a molecular sieve bed and a low-temperature adsorber are respectively isolated and regenerated. Before regeneration, during isolation and pressure relief of a normal purification train, the copper oxide bed and the molecular sieve bed need to be isolated and relieved to about 0.6MPa, the low-temperature adsorber needs to be independently relieved to about 0.22MPa, and the pressure relieved by the low-temperature adsorber alone cannot be monitored and controlled after isolation (0KBE10 CP003 cannot be used for pressure monitoring of a loop after the equipment is independently isolated). When the helium purification equipment is isolated independently, the regeneration process has the process of accessing the helium purification and regeneration system for communication and leveling, and each purification equipment side lacks a measuring point for pressure comparison, so that the function cannot be realized. And in the process of exhausting and depressurizing the regeneration equipment and subsequently filling helium in the isolation mode after regeneration, the pressure change of the isolation section of the purification equipment cannot be monitored. Similarly, in the purge flow of the cryogenic helium/helium heat exchanger, flow control and monitoring are also required in accordance with the pressure of the cryogenic adsorption stage.

At present, a vacuum gauge is respectively arranged at the pressure measuring points of three purifying devices, namely a copper oxide bed, a molecular sieve bed and a low-temperature adsorber in the system, the measuring range is 0.01 Pa-0.1 MPa, the vacuum gauge can only be used in the vacuumizing process of helium purifying devices, and the pressure change above the normal pressure cannot be monitored and participated in comparison (the pressure range should cover the whole range of 0.1-8.1 MPa). The regeneration automatic sequence control logic flow of each device of the helium purification system is judged by the indication of a vacuum gauge, and the indication of the vacuum gauge has no practical reference significance.

In current helium purification system designs, there is only one above-atmospheric transmitter 0KBE10/20CP003 in the helium purification system loop, which is located after the gas/water separator and before the molecular sieve bed. Once there the gauge fails, the pressure of the helium purge system cannot be monitored. Meanwhile, when the helium purification plant is regenerated alone, the plant section operating pressure cannot be monitored after isolation alone. Especially, in the process of executing the regeneration sequence control flow, the logic flow cannot be automatically completed due to the lack of system equipment pressure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is for carrying out effectual monitoring and control to each equipment section pressure of helium clean system to guide each equipment regeneration process of helium clean system, each equipment to keep apart the pressure release alone and fill helium gas process, and realize each clarification plant's logic control flow etc., be applied to the segmentation leak hunting of each section of helium clean system simultaneously and wait.

The technical scheme is as follows:

the regeneration pressure monitoring device of the helium purification equipment comprises a copper oxide bed, a molecular sieve bed and a low-temperature adsorber in a helium purification system loop, and is characterized in that: respectively adding a pressure monitoring device at the positions of the copper oxide bed, the molecular sieve bed and the vacuum gauge of the low-temperature adsorber, and sharing a source point and an instrument root valve with the vacuum gauge; the pressure monitoring device is connected with the monitoring center through a data bus.

Preferably: the pressure monitoring device is a pressure transmitter.

Preferably: the helium purification system comprises two normal purification rows, and 6 pressure measuring points are added to the two normal purification rows.

Preferably: the vacuum gauge and the pressure transmitter are connected with the vacuum pressure guiding pipe through a three-way pipe fitting to realize the control and use of different process flows.

Preferably: the copper oxide bed is isolated from the helium purification system loop, so that the copper oxide bed is communicated with the helium purification and regeneration system for aeration, and during the period, the pressure monitoring device monitors the pressure of the copper oxide bed and the pressure of the helium purification and regeneration system to be leveled.

Preferably: the pressure monitoring device monitors the exhaust pressure of a copper oxide bed of the regenerated helium purification system, and the copper oxide bed and the helium purification regeneration system are isolated to be vacuumized and connected with a purification column to be filled with helium gas, and the like.

Preferably: the regeneration process of the molecular sieve bed needs the pressure monitoring device to monitor the pressure of the isolated molecular sieve bed section, and meanwhile, the pressure monitoring device is applied to monitor the regeneration stage of the molecular sieve bed and the exhaust and inflation process after the regeneration. .

Preferably: before regeneration, during isolation and pressure relief of a normal purification train, the copper oxide bed and the molecular sieve bed are isolated and pressure relieved to about 0.6MPa, and the low-temperature adsorber is independently relieved to about 0.22 MPa.

Preferably: when the low-temperature adsorption section is isolated and sealed during the regeneration of the copper oxide bed and the molecular sieve bed, before heating regeneration, the pressure monitoring device monitors polluted waste helium gas to be discharged to a waste gas storage tank and is pressed to be less than or equal to 0.1MPa, the pressure monitoring device monitors the regeneration process of the low-temperature adsorption section and is used for the processes of exhausting after the regeneration of the low-temperature adsorption section, introducing purified helium gas and the like. .

Preferably: the pressure monitoring device is used to monitor the pressure at which the cryogenic helium/helium heat exchanger is isolated from the helium purification system alone while the cryogenic helium/helium heat exchanger is heating the purge alone. And is applied to the processes of exhausting, vacuumizing and helium filling after heating and purging of the low-temperature helium/helium heat exchanger.

Has the advantages that:

1) if the helium purification train 0KBE10/20CP003 fails in the helium purification system, the pressure monitoring and control device for the regeneration pressure of the helium purification equipment can be used for monitoring and controlling the pressure of each equipment section, so that the loop of the helium purification system is prevented from losing monitoring. For a single-row helium purification system, four pressure transmitters can be used for analyzing the pressure loss change of each section of helium purification equipment, and possible system leakage or equipment failure is judged, so that the system has certain guiding significance for preventing radioactive gas leakage;

2) pressure relief is needed before regeneration of the purification train, and the pressure of each equipment section is monitored and controlled in the regeneration process, each equipment section only has one vacuum gauge according to the existing design and cannot be used for indicating the system pressure, and the helium purification equipment regeneration pressure monitoring device can effectively ensure the helium purification regeneration;

3) after the copper oxide bed, the molecular sieve bed and the low-temperature adsorber are regenerated, the regeneration gas needs to be discharged to be close to the normal pressure, then the regeneration gas is vacuumized, and after the regeneration gas is vacuumized, a helium purification system or a helium supply system needs to be connected for gas filling. In the above process, it is also necessary to monitor the pressure of each purification device, and the regeneration pressure monitoring device of the helium purification device can ensure that each device of the helium purification system is restored to a usable state.

Drawings

FIG. 1 is a schematic flow diagram of a prior art helium purification system (column 1).

FIG. 2 is a schematic flow diagram of a prior art helium purge regeneration system.

FIG. 3 is a diagram of a pressure measurement point (0KBE10CP007 is a vacuum gauge) at the copper oxide bed of the present invention.

FIG. 4 is a diagram of pressure measurement points (0KBE10CP008 is a vacuum gauge) at the molecular sieve bed of the present invention.

FIG. 5 is a diagram of pressure measurement points (0KBE10CP009 is a vacuum gauge) at the low temperature adsorber of the present invention.

FIG. 6 is a diagram of the measuring point 0KBE10CP007 of the present invention with the measuring point 0KBE10CP011 added.

FIG. 7 is a diagram of the measuring point 0KBE10CP008 and the measuring point 0KBE10CP012 added in the present invention.

FIG. 8 is a diagram of measuring point 0KBE10CP013 at measuring point 0KBE10CP009 of the present invention.

FIG. 9 is a diagram of measuring point 0KBE20CP011 at measuring point 0KBE20CP007 of the present invention.

FIG. 10 is a diagram of the measuring point 0KBE20CP008 and the measuring point 0KBE20CP012 added in the present invention.

FIG. 11 is a diagram of measuring point 0KBE20CP013 at measuring point 0KBE20CP009 of the present invention.

FIG. 120 KBE10CP007 pressure transducer diagram.

FIG. 130 is a schematic diagram of a pressure transducer added at point 130 KBE10CP 008.

FIG. 140 is a schematic view of a pressure transmitter added at test point KBE10CP 009.

FIG. 150 is a schematic diagram of the pressure transducer added at the measurement point of KBE20CP 007.

FIG. 160 KBE20CP008 adds a schematic of the pressure transmitter.

FIG. 170 KBE20CP009 adds a schematic view of the pressure transmitter at measurement point.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a helium clarification plant regeneration pressure monitoring devices plans in order to realize the supervision and the control to each equipment section pressure in helium clarification system return circuit copper oxide bed, molecular sieve bed, the three clarification plant department of low temperature adsorber respectively increases the pressure transmitter of a malleation. At present, each purifying device, namely a copper oxide bed, a molecular sieve bed and a low-temperature adsorber, is provided with a vacuum gauge respectively, and is used in a vacuum pumping process, 3 pressure measuring points are added at the vacuum gauges of the three main devices, and share a source point and an instrument root valve with the existing vacuum gauge, so that a part needing to add a pressure transmitter at the vacuum gauge is used for optimizing system modification and convenient implementation, and a tee pipe is led out at a vacuum pressure leading pipe and is respectively connected with the vacuum gauge and the pressure transmitter, so that the control and the use of different process flows are realized. Because the high-temperature gas cooled reactor is 'two reactors with one machine', the corresponding helium purification systems are also two normal purification rows, so that 6 pressure measuring points are required to be added to the two rows.

The following aims at the utility model discloses specifically explain the three clarification plant regeneration process of copper oxide bed, molecular sieve bed, low temperature adsorber and low temperature helium heat exchanger's independent heating sweeps working process:

1. regeneration process of copper oxide bed

In the regeneration process of the copper oxide bed, the copper oxide bed is firstly isolated from the helium purification system, so that the copper oxide bed is communicated with the helium purification and regeneration system and is inflated. During this time, the pressure of the copper oxide bed section and the pressure of the helium purge regeneration system are monitored in parallel, and monitored by the pressure monitoring device at the added copper oxide bed. A helium gas stream at about 80 c was then passed over the copper oxide bed to form a copper peroxide bed and oxygen was continuously injected at the bed inlet in a metered amount to oxidize the copper in the bed to copper oxide.

In order to prevent the existence of a large amount of residual oxygen in the copper oxide bed, the regeneration helium gas needs to be discharged, and the exhaust pressure of the helium purification copper oxide bed needs to be monitored. The copper oxide bed and the helium purification regeneration system are isolated and respectively vacuumized (switched to a vacuum meter), the copper oxide bed is connected with a purification column and filled with helium gas, and the like, so that the regeneration process of the copper oxide bed is completed.

2. Regeneration of molecular sieve beds

Helium purification system molecular sieve bed regeneration is performed after isolation from the normal purification train and access to the regeneration system, forming a closed regeneration loop. At this time, the molecular sieve bed and the helium purification and regeneration system are leveled, and the pressure of the molecular sieve bed section after isolation needs to be monitored. The helium flow direction during the regeneration operation of the helium purification system molecular sieve bed is opposite to the helium flow direction during the purification operation.

Regeneration of the molecular sieve bed will be carried out in two stages:

(1) water condensing and separating operation

The regenerated helium gas is driven by two diaphragm compressors connected in parallel, and flows through a helium electric heater of a regeneration system, a helium purification system molecular sieve bed, a regeneration system water/helium cooler, a gas/water separator and an auxiliary molecular sieve bed in sequence and then returns to the inlet of the diaphragm compressor.

This is byThe electric heater heats helium to slowly heat the molecular sieve bed. During the heating process, the molecular sieve adsorbs H₂O and a small amount of CO₂Desorbed and released into the helium flowing therethrough, supersaturated H₂The O is condensed and separated in a subsequent gas/water separator. The tritium-containing wastewater which is not condensed and separated is adsorbed by the auxiliary molecular sieve bed.

In the process, the pressure of the molecular sieve bed equipment section is monitored in the whole process, so that the regeneration effect is ensured.

(2) Molecular sieve bed venting and evacuation of helium purification system

After the heating operation is stopped (the heater is powered off, and the diaphragm compressor is stopped), the regenerated waste helium gas in the molecular sieve bed and the regeneration loop of the helium purification system is exhausted from the bypass of the vacuumizing system of the helium auxiliary system, and at the moment, the pressure of the molecular sieve bed section needs to be monitored by a monitoring device.

Then, the evacuation is started by using the exhaust passage, and the vacuum is switched to a vacuum gauge for monitoring. The molecular sieve bed is then charged with a quantity of helium using a helium purge system, at which time the partial pressure of the molecular sieve bed section is monitored. And completing the regeneration of the molecular sieve bed of the helium purification system.

3. Regeneration of low-temperature adsorbers (activated carbon beds)

The activated carbon bed soaked in liquid nitrogen in the liquid nitrogen tank is collectively called as a low-temperature adsorber, the activated carbon bed is a fixed adsorbent bed, and the liquid nitrogen tank containing the activated carbon bed is only used for ensuring the low-temperature working condition of the activated carbon adsorbent. The regeneration of the low-temperature adsorber is the regeneration of the activated carbon of the adsorbent. The cryogenic adsorber is in communication with the cryogenic helium/helium heat exchanger upstream and downstream thereof without isolation, and thus may be referred to as a "cryogenic adsorption section" as a whole during purge and regeneration operations.

When the helium purification system to be regenerated is isolated and exhausted, the whole helium purification system is exhausted to 0.6MPa, the low-temperature adsorption section exhausts to less than or equal to 0.22MPa, at the moment, because the low-temperature adsorption section is isolated, only one vacuum gauge is arranged in the section, a positive pressure transmitter monitoring device is not needed, and at the moment, the regeneration monitoring device is required to be utilized for effective monitoring and control.

The 0KBE activated carbon bed heating regeneration scheme is described as follows:

the low-temperature adsorption section is isolated and closed during the regeneration of the copper oxide bed and the molecular sieve bed, before heating regeneration, polluted waste helium gas needs to be discharged to a waste gas storage tank in sequence, the pressure is discharged to be less than or equal to 0.1MPa, only one vacuum gauge is arranged at the section, and a positive pressure transmitter needs to be added for monitoring.

Reopening the associated valves forms a closed, cryogenic adsorption stage (including the activated carbon bed and the cryogenic helium/helium heat exchanger) regeneration loop with the helium purge regeneration system. The low-temperature adsorption section is connected with KBH to form a closed regeneration loop, and then heating regeneration operation can be carried out. The helium flow direction during regeneration operation of the activated carbon bed of the helium purification system is opposite to the helium flow direction during purification operation.

After the regeneration process is finished, the vacuumizing system is started, the activated carbon bed of the helium purification system is vacuumized, and then helium is filled into the low-temperature section from the upstream of the helium purification system until the helium is balanced, and the pressure of the helium purification low-temperature adsorption section also needs to be monitored in the process. Ending the regeneration operation of the low-temperature adsorption bed regeneration.

4. Individual heating purge for cryogenic helium/helium heat exchanger

The normal purified helium stream leaving the molecular sieve bed will contain very little H as an impurity₂O and CO₂When flowing through the low-temperature helium/helium heat exchanger, the refrigerant is accumulated on the inner heat exchange wall surface of the outer annular flow passage along with the reduction of the temperature, and the refrigerant reduces the heat exchange efficiency of the low-temperature helium/helium heat exchanger. Therefore, when designing the low-temperature helium/helium heat exchanger, the flow channel should be enlarged appropriately to avoid the occurrence of the flow channel blockage, but at the impurity H₂O and CO₂Under certain conditions, which are relatively numerous (early in the reactor operation), there is still a possibility of channel freeze-plugging.

Therefore, in addition to heating and purging the low-temperature helium/helium heat exchanger at the same time when the cryoadsorption bed is regenerated, it is also necessary to separately heat and purge the low-temperature helium/helium heat exchanger when the flow channel is frozen.

The heating purge process for a cryogenic helium/helium heat exchanger is described as follows:

the low-temperature helium/helium heat exchanger (together with the cryoadsorption bed) to be heated and purged is isolated from the purification train, and the exhaust system is used for exhausting, so that the low-temperature helium/helium heat exchanger is isolated from the helium purification system, a positive pressure monitoring device is not used for monitoring, and after a positive pressure transmitter is added, the low-temperature heat exchanger can be independently isolated to execute a corresponding pressure monitoring function.

The helium purge regeneration system is then switched on and operated to heat the cryogenic helium/helium heat exchanger with hot helium passing through the inner tube flow path of the cryogenic helium/helium heat exchanger to melt through the blocked outer annular flow path. Then exhausting corresponding waste gas, isolating the low-temperature helium/helium heat exchanger of the helium purification system from the regeneration system, and ending the heating purging of the low-temperature helium/helium heat exchanger. The helium purge regeneration system further exhausts, evacuates, and fills helium back to standby.

In the control flow of the helium purification system, aiming at the isolation and pressure relief flow of a helium purification train, the regeneration flow of each helium purification device, the purging flow of a low-temperature helium/helium heat exchanger and the like, the pressure value of a pipeline where the helium purification device is located needs to be monitored, and the specific positions of pressure measuring points are a copper oxide bed outlet, a molecular sieve bed outlet and a low-temperature adsorber outlet. Currently, the pressure measuring instruments arranged at the three positions are vacuum gauges, and the measuring range is 1.0 × 10-²～1.0×10⁵Pa, which can only be used in the vacuumizing process of helium purification equipment, cannot be used for monitoring pressure under the working condition that the pressure is more than 0.1 MPa.

In addition, if 0KBE10/20CP003 fails in the helium purification system, three newly added pressure transmitters can be used for pressure monitoring and control of each equipment section, and the loop of the helium purification system is prevented from being monitored. Meanwhile, the pressure loss change of each section of helium purification equipment can be analyzed by using four pressure transmitters. After the helium purification system leaks, the leakage position in the system is further judged by sectionalizing specific purification equipment (each section of equipment is provided with a respective front and rear electric isolation valve) and comparing the indication change of a newly-added pressure transmitter, and a leakage source is cut off in time.

Therefore, in order to ensure that the pressure parameters are effectively measured under various working conditions, a regeneration pressure monitoring device of the helium purification equipment is adopted, namely 1 pressure transmitter is respectively added at the outlets of the copper oxide bed, the molecular sieve bed and the low-temperature adsorber in the 1 row and the 2 row of the helium purification system, and pressure value monitoring signals are sent to a DCS for monitoring so as to meet the pressure monitoring requirements under various working conditions.

The data for the 6 pressure transmitters to be added are:

table 1 newly added 6 pressure transmitter data tables

The specific implementation position is a measuring point 0KBE10CP007 (a helium purification system 1 row copper oxide bed), and a measuring point 0KBE10CP011 is added; at a measuring point 0KBE10CP008 (a helium purification system 1-column molecular sieve bed), a measuring point 0KBE10CP012 is added; at a measuring point 0KBE10CP009 (a helium purification system 1 column low-temperature adsorber), a measuring point 0KBE10CP013 is added; at a measuring point 0KBE20CP007 (a helium purification system 2-row copper oxide bed), a measuring point 0KBE20CP011 is added; at a measuring point 0KBE20CP008 (a helium purification system 2-row molecular sieve bed), a measuring point 0KBE20CP012 is added; at point 0KBE20CP009 (column 2 cryogenic adsorber of helium purification System), point 0KBE20CP013 is added.

The utility model relates to an increase 6 pressure transmitter, the execution mode of concrete installation is for add "socket joint formula tee bend coupling" at vacuum gauge probe upstream instrument pipe, is connected to newly-increased pressure transmitter through the instrument pipe, increases weld joint and 100% PT detection after the modification, need not suppress again and helium leak hunting.

Taking 0KBE10CP011-B01 (a new pressure transmitter is added at a 1-row copper oxide bed of a helium purification system) as an example, a socket tee joint is added on an instrument pipe at the upstream of a vacuum gauge probe, the instrument pipe is connected to a pressure transmitter 0KBE10CP011-B01 fixed on an on-site instrument mounting frame, welding openings M03-M06 need to be added, the socket welding openings in the new welding openings are layered with 100% PT, the qualified PT standard is 100% RT according to a 1-level welding connector of NB/T20003.4, the qualified RT standard is 100% RT according to a 1-level welding connector of NB/T20003.3, and instrument pipe pressurization and helium leak detection are not carried out after welding. The partial view after the addition is shown in fig. 12.

Wherein, 1 TUBETTRIJOINT-S14 is a three-way socket pipe joint, 1TH1-01 is a transmitter on-site mounting frame, and 0KBE10CP011-B01 is an non-nuclear grade pressure transmitter.

The rest pressure transmitter installation devices are analogized in turn, and are respectively shown in figures 13-17.

In summary, according to the flow design of the helium purification system, 3 vacuum gauges are respectively installed on the adjacent pipe sections after the copper oxide bed, the molecular sieve bed and the low-temperature adsorber, but only used for indicating the pressure when the equipment is vacuumized. In order to change the defects of the process flow, a regeneration pressure monitoring device of the helium purification equipment is adopted, a positive pressure transmitter is respectively added at three equipment sections of a copper oxide bed, a molecular sieve bed and a low-temperature adsorber of a helium purification system loop, and acquired pressure signals are uploaded to a monitoring center through a data aggregation line so as to realize the monitoring of the pressure of each equipment section.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. The regeneration pressure monitoring device of the helium purification equipment comprises a copper oxide bed, a molecular sieve bed and a low-temperature adsorber in a helium purification system loop, and is characterized in that: respectively adding a pressure monitoring device at the positions of the copper oxide bed, the molecular sieve bed and the vacuum gauge of the low-temperature adsorber, and sharing a source point and an instrument root valve with the vacuum gauge; the pressure monitoring device is connected with the monitoring center through a data bus.

2. The helium purification apparatus regeneration pressure monitoring device according to claim 1, wherein: the pressure monitoring device is a pressure transmitter.

3. The helium purification apparatus regeneration pressure monitoring device according to claim 1, wherein: the helium purification system comprises two normal purification rows, and 6 pressure measuring points are added to the two normal purification rows.

4. The helium purification apparatus regeneration pressure monitoring device according to claim 1, wherein: the vacuum gauge and the pressure transmitter are connected with the vacuum pressure guiding pipe through a three-way pipe fitting to realize the control and use of different process flows.

5. The helium purification apparatus regeneration pressure monitoring device according to claim 1, wherein: the copper oxide bed is isolated from the helium purification system loop, so that the copper oxide bed is communicated with the helium purification and regeneration system for aeration, and during the period, the pressure monitoring device monitors the pressure of the copper oxide bed and the pressure of the helium purification and regeneration system to be leveled.

6. The helium purification apparatus regeneration pressure monitoring device according to claim 1, wherein: the pressure monitoring device monitors the exhaust pressure of a copper oxide bed of the regenerated helium purification system, and the copper oxide bed and the helium purification regeneration system are isolated to be vacuumized and connected with a purification column to be filled with helium respectively.

7. The helium purification apparatus regeneration pressure monitoring device according to claim 1, wherein: the regeneration process of the molecular sieve bed requires the pressure monitoring device to monitor the pressure of the isolated molecular sieve bed section; and simultaneously monitoring the exhaust and inflation processes of the molecular sieve bed in the regeneration stage and after the regeneration by using the pressure monitoring device.