High-temperature gas cooled reactor helium purification monitoring system and start-stop and helium purification regeneration judgment method

Abstract

The invention relates to the technical field of nuclear reactors, and discloses a high-temperature gas cooled reactor helium purification monitoring system and a start-stop and helium purification regeneration judgment method. The high-temperature gas cooled reactor helium purification monitoring system comprises a humidity monitoring module arranged in a high-temperature gas cooled reactor; the first monitoring module is arranged between the dust filter and the copper oxide bed and consists of a first moisture concentration monitoring unit, a first gas tritium concentration monitoring unit and a first liquid tritium concentration monitoring unit; the second monitoring module is arranged between the copper oxide bed and the molecular sieve bed and consists of a second moisture concentration monitoring unit, a second gas tritium concentration monitoring unit and a second liquid tritium concentration monitoring unit; and the third monitoring module is arranged between the molecular sieve bed and the low-temperature adsorber and consists of a third moisture concentration monitoring unit, a third gas tritium concentration monitoring unit and a third liquid tritium concentration monitoring unit. By monitoring the humidity of the high-temperature gas cooled reactor and parameters of all links of the helium purification system, a basis is provided for determining the helium purification regeneration period, and impurities are prevented from exceeding the standard or being excessively regenerated.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear reactors, and in particular to a high-temperature gas-cooled reactor helium purification monitoring system and a start-stop and helium purification regeneration judgment method. Background Art

[0002] As the fourth generation of nuclear power technology, the coolant of the primary circuit of the high temperature gas-cooled reactor nuclear power plant is helium. The moisture content in helium is crucial to the safe and stable operation of the high temperature gas-cooled reactor nuclear power plant unit. Specifically, moisture can easily react chemically with the carbon material components in the high temperature gas-cooled reactor at high temperatures, affecting the strength of the carbon material components and the safety of the high temperature gas-cooled reactor; high moisture content leads to high humidity, which can easily lead to uneven core temperature distribution of the high temperature gas-cooled reactor, seriously affecting the stable operation of the high temperature gas-cooled reactor; when the moisture content in the primary circuit is high, it is easy to reduce the electrical insulation performance of the main helium fan motor cavity of the primary circuit, increasing the risk of equipment damage.

[0003] Therefore, a primary helium purification system is used to purify and remove impurities such as moisture. After a period of operation, the primary helium purification system needs to be regenerated; however, since the regeneration cycle of the molecular sieve bed of the primary helium purification system is determined based on the operating time of the existing primary helium, it is easy to cause the moisture and other impurities of the primary helium to exceed the standard or the helium purification system to over-regenerate, which significantly increases the cost. Summary of the invention

[0004] In view of this, the present invention provides a high-temperature gas-cooled reactor helium purification monitoring system to solve the problem that due to insufficient monitoring of the existing primary-loop helium purification system, the regeneration cycle of the molecular sieve bed of the primary-loop helium purification system is determined only based on the operating time, which can easily lead to excessive impurities such as moisture in the primary-loop helium or excessive regeneration of the helium purification system, thereby significantly increasing costs.

[0005] In a first aspect, the present invention provides a high temperature gas-cooled reactor helium purification monitoring system, which is suitable for monitoring a primary helium purification system, wherein the primary helium purification system comprises: a dust filter, a copper oxide bed, a molecular sieve bed and a cryogenic adsorber connected in sequence, wherein the dust filter and the cryogenic adsorber are both connected to the primary circuit of the high temperature gas-cooled reactor; the high temperature gas-cooled reactor helium purification monitoring system comprises:

[0006] A humidity monitoring module, comprising a plurality of humidity monitoring probes, the plurality of humidity monitoring probes being dispersedly arranged in the high temperature gas-cooled reactor, the humidity monitoring probes being suitable for obtaining the dew point temperature; at least half of the humidity monitoring probes are main helium humidity monitoring probes, the main helium humidity monitoring probes being suitable for obtaining the dew point temperature of the helium gas in the primary helium purification system in the high temperature gas-cooled reactor;

[0007] Gas chromatograph, suitable for obtaining hydrogen content in high-temperature gas-cooled reactors;

[0008] a first monitoring module, arranged on a pipeline connecting the dust filter and the copper oxide bed; the first monitoring module is composed of a first moisture concentration monitoring unit, a first gas tritium concentration monitoring unit and a first liquid tritium concentration monitoring unit; the first moisture concentration monitoring unit is suitable for obtaining moisture concentration, the first gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the first liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration;

[0009] A second monitoring module is arranged on a pipeline connecting the copper oxide bed and the molecular sieve bed; the second monitoring module is composed of a second moisture concentration monitoring unit, a second gas tritium concentration monitoring unit and a second liquid tritium concentration monitoring unit; the second moisture concentration monitoring unit is suitable for obtaining moisture concentration, the second gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the second liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration;

[0010] The third monitoring module is arranged on the pipeline connecting the molecular sieve bed and the cryogenic adsorber; the third monitoring module is composed of a third moisture concentration monitoring unit, a third gas tritium concentration monitoring unit and a third liquid tritium concentration monitoring unit; the third moisture concentration monitoring unit is suitable for obtaining moisture concentration, the third gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the third liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration. Beneficial effect: The present application adopts the above technical scheme to monitor the humidity of the high-temperature gas-cooled reactor through the high-temperature gas-cooled reactor helium purification monitoring system, and monitors the parameter indicators after each processing link of the primary helium purification system, providing an accurate basis for determining the regeneration period of the primary helium purification system, thereby preventing the moisture and other impurities in the primary helium purification system from exceeding the standard or over-regeneration, and significantly reducing costs.

[0011] Optionally, the number of the humidity monitoring probes is four.

[0012] Optionally, the first moisture concentration monitoring unit, the second moisture concentration monitoring unit and the third moisture concentration monitoring unit all use a silicon wafer method to perform trace analysis on moisture.

[0013] In a second aspect, the present invention further provides a method for determining the start and stop of a high temperature gas-cooled reactor, which uses the high temperature gas-cooled reactor helium purification monitoring system, and comprises:

[0014] Before the high temperature gas-cooled reactor is started for the first time or before resuming operation after overhaul, when the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than the set concentration value and when formula (1) is satisfied, the high temperature gas-cooled reactor is started;

[0015] a / b≤c (1)

[0016] Wherein, a is the moisture concentration value obtained by the third moisture concentration monitoring unit, b is the moisture concentration value obtained by the second moisture concentration monitoring unit, and c is the set first percentage;

[0017] During the operation of the high temperature gas-cooled reactor, when the dew point temperature obtained by the main helium humidity monitoring probe is ≥35°C, the high temperature gas-cooled reactor is triggered to stop working; before the high temperature gas-cooled reactor is started again, when the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than the set concentration value, the high temperature gas-cooled reactor is started; otherwise, the helium in the high temperature gas-cooled reactor is circulated and purified by a primary helium purification system;

[0018] During the operation of the high-temperature gas-cooled reactor, when the moisture concentration value obtained by the first moisture concentration monitoring unit exceeds the set control concentration value, the helium in the high-temperature gas-cooled reactor is purified within the set time by increasing the flow rate of the primary helium purification system or connecting multiple primary helium purification systems in parallel until the moisture concentration value obtained by the first moisture concentration monitoring unit is no greater than the set control concentration value; otherwise, the high-temperature gas-cooled reactor is stopped or the operating power of the high-temperature gas-cooled reactor is reduced. Beneficial effect: The present application adopts the above technical solution to monitor parameters such as the moisture concentration of the high-temperature gas-cooled reactor and after the dust filter, or to process the above parameters to determine whether to start the high-temperature gas-cooled reactor, and to use the primary helium purification system to purify moisture impurities in a timely manner, thereby achieving effective control of moisture impurities and ensuring the safe and stable operation of the high-temperature gas-cooled reactor. In addition, through comprehensive processing and comparison of multiple parameters, it is possible to prevent misjudgment caused by failure of measurement of a certain parameter.

[0019] Optionally, the set concentration value is 2 ppm; and the first percentage c is 10%.

[0020] In a third aspect, the present invention further provides a method for judging the regeneration of helium purification in a high temperature gas-cooled reactor, which uses the high temperature gas-cooled reactor helium purification monitoring system, comprising:

[0021] During the operation of the high temperature gas-cooled reactor, when the humidity value obtained by the humidity monitoring module and the moisture concentration value obtained by the first moisture concentration monitoring unit both have an upward trend, and the humidity value obtained by the humidity monitoring module and the moisture concentration value obtained by the first moisture concentration monitoring unit do not exceed the corresponding set limit values, and when formula (2) is satisfied, the copper oxide bed or the molecular sieve bed is regenerated;

[0022] (d+e) / (f+g)≥h (2)

[0023] Among them, d is the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit, e is the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit, f is the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit, g is the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit, and h is the set second percentage. Beneficial effect: The present application adopts the above technical scheme to monitor the high-temperature gas-cooled reactor, the moisture concentration, gas tritium concentration and liquid tritium concentration after the dust filter, and the gas tritium concentration and liquid tritium concentration after the molecular sieve bed, or process the above parameters to determine whether to regenerate the copper oxide bed or the molecular sieve bed, prevent the moisture and other impurities in the primary helium purification system from exceeding the standard or over-regeneration, and ensure the safe and stable operation of the high-temperature gas-cooled reactor. In addition, through comprehensive processing and comparison of multiple parameters, it is possible to prevent misjudgment caused by failure in measuring a certain parameter; accurately judge the degree of penetration of the primary helium purification system, and determine the actual regeneration requirements of the copper oxide bed and molecular sieve bed in the primary helium purification system, so as to avoid excessive impurities in the high-temperature gas-cooled reactor due to premature penetration of the primary helium purification system, or regeneration due to insufficient use of the primary helium purification system, which affects the economic efficiency of the operation.

[0024] Optionally, the second percentage h is 10%.

[0025] In a fourth aspect, the present invention further provides a method for judging the regeneration of helium purification in a high temperature gas-cooled reactor, which uses the high temperature gas-cooled reactor helium purification monitoring system, comprising:

[0026] When the high temperature gas-cooled reactor helium purification monitoring system meets any two of the first condition, the second condition, the third condition, the fourth condition and the fifth condition, the molecular sieve bed is regenerated;

[0027] The first condition is to satisfy formula (3),

[0028] a / b≥i (3)

[0029] Wherein, a is the moisture concentration value obtained by the third moisture concentration monitoring unit, b is the moisture concentration value obtained by the second moisture concentration monitoring unit, and i is the set third percentage;

[0030] The second condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit;

[0031] The third condition is that the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit;

[0032] The fourth condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit is greater than the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit;

[0033] The fifth condition is: the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit has an increasing trend. Beneficial effect: The present application adopts the above technical solution, by monitoring the gas tritium concentration and liquid tritium concentration after the dust filter, the moisture concentration after the copper oxide bed, and the moisture concentration, gas tritium concentration and liquid tritium concentration after the molecular sieve bed, or combining the above parameters for judgment and processing, to determine whether to regenerate the molecular sieve bed, to prevent the impurities such as moisture in the primary helium purification system from exceeding the standard or over-regeneration, and to ensure the safe and stable operation of the high-temperature gas-cooled reactor. In addition, through comprehensive processing and comparison of multiple parameters, it is possible to prevent misjudgment caused by failure of measurement of a certain parameter; accurately judge the penetration degree of the primary helium purification system, and determine the actual regeneration demand of the molecular sieve bed in the primary helium purification system, so as to avoid the primary helium purification system from penetrating in advance, causing impurities in the high-temperature gas-cooled reactor to exceed the standard, or the primary helium purification system is under-used and regenerated, affecting the economic efficiency of operation.

[0034] Optionally, it also includes:

[0035] When the high temperature gas-cooled reactor helium purification monitoring system meets any two of the sixth condition, the seventh condition, the eighth condition and the ninth condition, the copper oxide bed is regenerated;

[0036] The sixth condition is that the hydrogen content in the high temperature gas-cooled reactor obtained by the gas chromatograph is not 0, and the moisture concentration value obtained by the second moisture concentration monitoring unit is not greater than the moisture concentration value obtained by the first moisture concentration monitoring unit;

[0037] The seventh condition is: the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the second gas tritium concentration monitoring unit;

[0038] The eighth condition is that the gas tritium concentration value obtained by the second gas tritium concentration monitoring unit has an increasing trend;

[0039] The ninth condition is: the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit has an increasing trend. Beneficial effect: The present application adopts the above technical solution, by monitoring the gas tritium concentration and moisture concentration after the high-temperature gas-cooled reactor and the dust filter, the moisture concentration and gas tritium concentration after the copper oxide bed, and the gas tritium concentration after the molecular sieve bed and other parameters, or combining the above parameters for judgment and processing, to determine whether to regenerate the copper oxide bed, to prevent the impurities such as moisture in the primary helium purification system from exceeding the standard or over-regeneration, and to ensure the safe and stable operation of the high-temperature gas-cooled reactor. In addition, through comprehensive processing and comparison of multiple parameters, it is possible to prevent misjudgment caused by failure of measurement of a certain parameter; accurately judge the penetration degree of the primary helium purification system, and determine the actual regeneration demand of the copper oxide bed in the primary helium purification system, so as to avoid the primary helium purification system from penetrating in advance, causing impurities in the high-temperature gas-cooled reactor to exceed the standard, or the primary helium purification system is not used enough and regenerated, affecting the economy of operation.

[0040] Optionally, the third percentage i is 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a connection schematic diagram of a high temperature gas-cooled reactor helium purification monitoring system provided in an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Dust filter; 2. Copper oxide bed; 3. Molecular sieve bed; 4. Low-temperature adsorber; 5. High-temperature gas-cooled reactor; 6. Humidity monitoring module; 7. First monitoring module; 8. Second monitoring module; 9. Third monitoring module. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0046] like Figure 1A specific implementation of a high temperature gas-cooled reactor helium purification monitoring system is shown, and the high temperature gas-cooled reactor helium purification monitoring system is suitable for monitoring a primary helium purification system, and the primary helium purification system comprises: a dust filter 1, a copper oxide bed 2, a molecular sieve bed 3 and a cryogenic adsorber 4 connected in sequence, and the dust filter 1 and the cryogenic adsorber 4 are both connected to the primary circuit of the high temperature gas-cooled reactor 5; the dust filter 1 is used to filter solid particles in the helium output from the primary circuit of the high temperature gas-cooled reactor 5; the copper oxide bed 2 is used to remove hydrogen, carbon monoxide and oxygen impurities in the helium; the molecular sieve bed 3 is used to adsorb water and carbon dioxide in the helium; the cryogenic adsorber 4 is used to adsorb impurities such as nitrogen, methane and inert gas in the helium, and then reflux the purified helium to the primary circuit of the high temperature gas-cooled reactor 5.

[0047] The high temperature gas-cooled reactor helium purification monitoring system comprises: a humidity monitoring module 6, a first monitoring module 7, a second monitoring module 8, a third monitoring module 9 and a gas chromatograph.

[0048] The humidity monitoring module 6 is composed of a plurality of humidity monitoring probes, which are dispersedly arranged in the high temperature gas-cooled reactor 5. The humidity monitoring probes are suitable for obtaining the dew point temperature; at least half of the humidity monitoring probes are main helium humidity monitoring probes, which are suitable for obtaining the dew point temperature of the helium in the primary helium purification system in the high temperature gas-cooled reactor, and the humidity is expressed by the dew point temperature. Specifically, the number of the humidity monitoring probes is four. The gas chromatograph is suitable for obtaining the hydrogen content in the high temperature gas-cooled reactor 5; specifically, gas is extracted from each monitoring point and sent to the gas chromatograph for hydrogen content analysis.

[0049] The first monitoring module 7 is arranged on the pipeline connecting the dust filter 1 and the copper oxide bed 2; the first monitoring module 7 is composed of a first moisture concentration monitoring unit, a first gas tritium concentration monitoring unit and a first liquid tritium concentration monitoring unit; the first moisture concentration monitoring unit is suitable for obtaining moisture concentration, the first gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the first liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration. The second monitoring module 8 is arranged on the pipeline connecting the copper oxide bed 2 and the molecular sieve bed 3; the second monitoring module 8 is composed of a second moisture concentration monitoring unit, a second gas tritium concentration monitoring unit and a second liquid tritium concentration monitoring unit; the second moisture concentration monitoring unit is suitable for obtaining moisture concentration, the second gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the second liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration. The third monitoring module 9 is arranged on the pipeline connecting the molecular sieve bed 3 and the cryogenic adsorber 4; the third monitoring module 9 is composed of a third moisture concentration monitoring unit, a third gas tritium concentration monitoring unit and a third liquid tritium concentration monitoring unit; the third moisture concentration monitoring unit is suitable for obtaining moisture concentration, the third gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the third liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration. Specifically, the first moisture concentration monitoring unit, the second moisture concentration monitoring unit and the third moisture concentration monitoring unit all use the silicon wafer method to perform trace analysis on moisture, specifically, extracting gas from each monitoring point and sending it to the silicon wafer water analyzer for trace analysis.

[0050] The present invention also provides a method for determining the start and stop of a high temperature gas-cooled reactor, which uses the high temperature gas-cooled reactor helium purification monitoring system, and comprises:

[0051] Before the high temperature gas-cooled reactor 5 is started for the first time or before resuming operation after overhaul, when the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than the set concentration value and when formula (1) is satisfied, the high temperature gas-cooled reactor 5 is started;

[0052] a / b≤c (1)

[0053] Among them, a is the moisture concentration value obtained by the third moisture concentration monitoring unit, b is the moisture concentration value obtained by the second moisture concentration monitoring unit, and c is the set first percentage. Specifically, the set concentration value is 2ppm; the first percentage c is 10%. The above-mentioned startup judgment of the high-temperature gas-cooled reactor 5 is because before the high-temperature gas-cooled reactor 5 is started for the first time or before resuming operation after overhaul, air containing moisture is likely to have entered the high-temperature gas-cooled reactor 5, and it is necessary to increase the frequency of the first moisture concentration monitoring unit, the second moisture concentration monitoring unit and the third moisture concentration monitoring unit to obtain the moisture concentration in advance.

[0054] During the operation of the high temperature gas-cooled reactor 5, when the dew point temperature obtained by the main helium humidity monitoring probe is ≥35°C, it is prompted that the heat transfer tube connected to the primary helium purification system may be broken, triggering the high temperature gas-cooled reactor 5 to stop working, and the reactor protection signal is activated; before the high temperature gas-cooled reactor 5 is started again, when the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than the set concentration value, the high temperature gas-cooled reactor 5 is started; otherwise, the primary helium purification system is used to circulate and purify the helium in the high temperature gas-cooled reactor 5 to ensure that the moisture in the high temperature gas-cooled reactor 5 meets the operation requirements.

[0055] During the operation of the high temperature gas-cooled reactor 5, when the moisture concentration value obtained by the first moisture concentration monitoring unit exceeds the set control concentration value, the frequency of the first moisture concentration monitoring unit obtaining the moisture concentration is increased, and the cause of the increased moisture concentration is checked. At the same time, the helium in the high temperature gas-cooled reactor 5 is purified by increasing the flow rate of the primary helium purification system or connecting multiple primary helium purification systems in parallel within the set time until the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than the set control concentration value; otherwise, the high temperature gas-cooled reactor 5 is stopped or the operating power of the high temperature gas-cooled reactor 5 is reduced.

[0056] The present invention also provides a method for judging the purification and regeneration of a high temperature gas-cooled reactor helium, which uses the high temperature gas-cooled reactor helium purification monitoring system, comprising:

[0057] During the operation of the high temperature gas-cooled reactor 5, when the humidity value obtained by the humidity monitoring module 6 and the moisture concentration value obtained by the first moisture concentration monitoring unit both have an increasing trend, and the humidity value obtained by the humidity monitoring module 6 and the moisture concentration value obtained by the first moisture concentration monitoring unit do not exceed the corresponding set limit values, and when formula (2) is satisfied, the copper oxide bed 2 or the molecular sieve bed 3 is regenerated;

[0058] (d+e) / (f+g)≥h (2)

[0059] Among them, d is the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit, e is the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit, f is the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit, g is the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit, and h is the set second percentage. Specifically, the second percentage h is 10%.

[0060] The present invention also provides a method for judging the purification and regeneration of a high temperature gas-cooled reactor helium, which uses the high temperature gas-cooled reactor helium purification monitoring system, comprising:

[0061] When the high temperature gas-cooled reactor helium purification monitoring system meets any two of the first condition, the second condition, the third condition, the fourth condition and the fifth condition, the molecular sieve bed 3 is regenerated;

[0062] The first condition is to satisfy formula (3),

[0063] a / b≥i (3)

[0064] Among them, a is the moisture concentration value obtained by the third moisture concentration monitoring unit, b is the moisture concentration value obtained by the second moisture concentration monitoring unit, and i is the set third percentage; specifically, the third percentage i is 10%.

[0065] The second condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit;

[0066] The third condition is that the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit;

[0067] The fourth condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit is greater than the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit;

[0068] The fifth condition is that when the gas impurity content in the high temperature gas-cooled reactor 5 is substantially stable, the liquid tritium concentration value acquired by the third liquid tritium concentration monitoring unit has an increasing trend.

[0069] When the high temperature gas-cooled reactor helium purification monitoring system meets any two of the sixth condition, the seventh condition, the eighth condition and the ninth condition, the copper oxide bed 2 is regenerated;

[0070] The sixth condition is that the hydrogen content in the high temperature gas-cooled reactor 5 obtained by the gas chromatograph is not 0, and the moisture concentration value obtained by the second moisture concentration monitoring unit is not greater than the moisture concentration value obtained by the first moisture concentration monitoring unit;

[0071] The seventh condition is: the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the second gas tritium concentration monitoring unit;

[0072] The eighth condition is that when the gas impurity content in the high temperature gas-cooled reactor 5 is substantially stable, the gas tritium concentration value acquired by the second gas tritium concentration monitoring unit has an increasing trend;

[0073] The ninth condition is that when the gas impurity content in the high temperature gas-cooled reactor 5 is substantially stable, the gas tritium concentration value acquired by the third gas tritium concentration monitoring unit has an increasing trend.

[0074] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A high temperature gas-cooled reactor helium purification monitoring system, suitable for monitoring a primary helium purification system, the primary helium purification system comprising: A dust filter (1), a copper oxide bed (2), a molecular sieve bed (3) and a cryogenic adsorber (4) connected in sequence, wherein the dust filter (1) and the cryogenic adsorber (4) are both connected to a primary circuit of a high temperature gas-cooled reactor (5); characterized in that the high temperature gas-cooled reactor helium purification monitoring system comprises: A humidity monitoring module (6) is composed of a plurality of humidity monitoring probes, the plurality of humidity monitoring probes are dispersedly arranged in the high temperature gas-cooled reactor (5), the humidity monitoring probes being suitable for obtaining dew point temperature; at least half of the humidity monitoring probes are main helium humidity monitoring probes, the main helium humidity monitoring probes being suitable for obtaining the dew point temperature of helium in a primary helium purification system located in the high temperature gas-cooled reactor; A gas chromatograph, suitable for obtaining the hydrogen content in the high temperature gas-cooled reactor (5); A first monitoring module (7) is arranged on a pipeline connecting the dust filter (1) and the copper oxide bed (2); the first monitoring module (7) is composed of a first moisture concentration monitoring unit, a first gas tritium concentration monitoring unit and a first liquid tritium concentration monitoring unit; the first moisture concentration monitoring unit is suitable for obtaining moisture concentration, the first gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the first liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration; A second monitoring module (8) is arranged on a pipeline connecting the copper oxide bed (2) and the molecular sieve bed (3); the second monitoring module (8) is composed of a second moisture concentration monitoring unit, a second gas tritium concentration monitoring unit and a second liquid tritium concentration monitoring unit; the second moisture concentration monitoring unit is suitable for obtaining moisture concentration, the second gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the second liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration; A third monitoring module (9) is arranged on a pipeline connecting the molecular sieve bed (3) and the cryogenic adsorber (4); the third monitoring module (9) is composed of a third moisture concentration monitoring unit, a third gas tritium concentration monitoring unit and a third liquid tritium concentration monitoring unit; the third moisture concentration monitoring unit is suitable for obtaining moisture concentration, the third gas tritium concentration monitoring unit is suitable for obtaining gas tritium concentration, and the third liquid tritium concentration monitoring unit is suitable for obtaining liquid tritium concentration.

2. The high temperature gas-cooled reactor helium purification monitoring system according to claim 1, characterized in that: The number of the humidity monitoring probes is four.

3. The high temperature gas-cooled reactor helium purification monitoring system according to claim 1, characterized in that: The first moisture concentration monitoring unit, the second moisture concentration monitoring unit and the third moisture concentration monitoring unit all use the silicon wafer method to perform trace analysis on moisture.

4. A method for determining the start and stop of a high temperature gas-cooled reactor, using the high temperature gas-cooled reactor helium purification monitoring system according to any one of claims 1 to 3, characterized in that: include: Before the high temperature gas-cooled reactor (5) is started for the first time or before it is resumed after overhaul, when the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than a set concentration value and when formula (1) is satisfied, the high temperature gas-cooled reactor (5) is started; a / b≤c (1) Wherein, a is the moisture concentration value obtained by the third moisture concentration monitoring unit, b is the moisture concentration value obtained by the second moisture concentration monitoring unit, and c is the set first percentage; During the operation of the high temperature gas-cooled reactor (5), when the dew point temperature obtained by the main helium humidity monitoring probe is ≥35°C, the high temperature gas-cooled reactor (5) is triggered to stop working; before the high temperature gas-cooled reactor (5) is started again, when the moisture concentration value obtained by the first moisture concentration monitoring unit is not greater than a set concentration value, the high temperature gas-cooled reactor (5) is started; otherwise, a primary helium purification system is used to circulate and purify the helium in the high temperature gas-cooled reactor (5); During the operation of the high temperature gas-cooled reactor (5), when the moisture concentration value obtained by the first moisture concentration monitoring unit exceeds a set control concentration value, the helium in the high temperature gas-cooled reactor (5) is purified within a set time by increasing the flow rate of a primary helium purification system or by connecting multiple primary helium purification systems in parallel until the moisture concentration value obtained by the first moisture concentration monitoring unit is no greater than the set control concentration value; otherwise, the high temperature gas-cooled reactor (5) is stopped or the operating power of the high temperature gas-cooled reactor (5) is reduced.

5. The method for determining the start and stop of a high temperature gas-cooled reactor according to claim 4, characterized in that: The set concentration value is 2 ppm; the first percentage c is 10%.

6. A method for judging the regeneration of helium purification in a high temperature gas-cooled reactor, using the high temperature gas-cooled reactor helium purification monitoring system according to any one of claims 1 to 3, characterized in that: include: During the operation of the high temperature gas-cooled reactor (5), when the humidity value obtained by the humidity monitoring module (6) and the moisture concentration value obtained by the first moisture concentration monitoring unit both have an upward trend, and the humidity value obtained by the humidity monitoring module (6) and the moisture concentration value obtained by the first moisture concentration monitoring unit do not exceed the corresponding set limit values, and when formula (2) is satisfied, the copper oxide bed (2) or the molecular sieve bed (3) is regenerated; (d+e) / (f+g)≥h (2) Among them, d is the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit, e is the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit, f is the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit, g is the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit, and h is the set second percentage.

7. The method for judging the purification and regeneration of a high temperature gas-cooled reactor according to claim 6, characterized in that: The second percentage h is 10%.

8. A method for judging the regeneration of helium purification in a high temperature gas-cooled reactor, using the high temperature gas-cooled reactor helium purification monitoring system according to any one of claims 1 to 3, characterized in that: include: When the high temperature gas-cooled reactor helium purification monitoring system meets any two of the first condition, the second condition, the third condition, the fourth condition and the fifth condition, the molecular sieve bed (3) is regenerated; The first condition is to satisfy formula (3), a / b≥i (3) Wherein, a is the moisture concentration value obtained by the third moisture concentration monitoring unit, b is the moisture concentration value obtained by the second moisture concentration monitoring unit, and i is the set third percentage; The second condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit; The third condition is that the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit; The fourth condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit is greater than the liquid tritium concentration value obtained by the first liquid tritium concentration monitoring unit; The fifth condition is that the liquid tritium concentration value obtained by the third liquid tritium concentration monitoring unit has an increasing trend.

9. The method for judging the purification and regeneration of a high temperature gas-cooled reactor according to claim 8, characterized in that: Also includes: When the high temperature gas-cooled reactor helium purification monitoring system meets any two of the sixth condition, the seventh condition, the eighth condition and the ninth condition, the copper oxide bed (2) is regenerated; The sixth condition is that the hydrogen content in the high temperature gas-cooled reactor (5) obtained by the gas chromatograph is not zero, and the moisture concentration value obtained by the second moisture concentration monitoring unit is not greater than the moisture concentration value obtained by the first moisture concentration monitoring unit; The seventh condition is: the gas tritium concentration value obtained by the first gas tritium concentration monitoring unit is greater than the gas tritium concentration value obtained by the second gas tritium concentration monitoring unit; The eighth condition is that the gas tritium concentration value obtained by the second gas tritium concentration monitoring unit has an increasing trend; The ninth condition is that the gas tritium concentration value obtained by the third gas tritium concentration monitoring unit has an increasing trend.

10. The method for judging the purification and regeneration of a high temperature gas-cooled reactor according to claim 8 or 9, characterized in that: The third percentage i is 10%.

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