阅读说明：本技术 一种稳压器电加热器的运行方法 (Operation method of voltage stabilizer electric heater ) 是由 李洪伟 徐霞军 郭莉侠 王雄辉 *** 石岩 王亚东 翁铖忠 吴东方 王镜淇 张 于 2020-06-03 设计创作，主要内容包括：本发明涉及核电站电气维修技术领域,尤其涉及一种稳压器电加热器的运行方法。所述运行方法为：稳压器电加热器平均分为若干个区间,每个区间选取1个电加热器组成一组,组成W组；在第1个周期内,选定一组稳压器电加热器标记为长期组电加热器,其他组稳压器电加热器标记为短期组电加热器；在第1+M个周期内,选定一组未被标记过作为长期组电加热器的稳压器电加热器标记为第1+M个周期内的长期组电加热器,其他组稳压器电加热器标记为短期组电加热器；当一组稳压器电加热器被标记过一次作为长期组电加热器,W-1次作为短期组电加热器后,对该组稳压器电加热器进行更换。该运行方法,提高了稳压器电加热器的利用率,降低了故障率。(The invention relates to the technical field of electrical maintenance of nuclear power stations, in particular to an operation method of an electric heater of a voltage stabilizer. The operation method comprises the following steps: the electric heater of the voltage stabilizer is averagely divided into a plurality of sections, and 1 electric heater is selected from each section to form a group, so that a group W is formed; in the 1 st period, selecting one group of voltage stabilizer electric heaters as long-term group electric heaters, and selecting other groups of voltage stabilizer electric heaters as short-term group electric heaters; in the 1+ M period, selecting a group of voltage stabilizer electric heaters which are not marked as long-term group electric heaters in the 1+ M period, and marking other groups of voltage stabilizer electric heaters as short-term group electric heaters; when a group of voltage stabilizer electric heaters are marked once to be used as a long-term group electric heater and W-1 times to be used as a short-term group electric heater, the group of voltage stabilizer electric heaters are replaced. The operation method improves the utilization rate of the electric heater of the voltage stabilizer and reduces the failure rate.)

1. A method of operating a potentiostat electric heater, comprising the steps of:

step S1: the method comprises the following steps of performing zoning according to the total number of voltage stabilizer electric heaters, evenly dividing the voltage stabilizer electric heaters into a plurality of zones, wherein the number of the voltage stabilizer electric heaters in each zone is equal, 1 voltage stabilizer electric heater is selected from each zone to form a group, W groups are formed, and adjacent voltage stabilizer electric heaters in the same group are at least separated by two voltage stabilizer electric heaters; w is a positive integer;

step S2: in the 1 st refueling cycle period, selecting one group of voltage stabilizer electric heaters in the step S1 as a long-term group electric heater, and selecting other W-1 groups of voltage stabilizer electric heaters as short-term group electric heaters;

step S3: in the 1+ M material changing cycle period, a group of voltage stabilizer electric heaters which are not marked as long-term group electric heaters are selected and marked as long-term group electric heaters in the 1+ M material changing cycle period, and other W-1 groups of voltage stabilizer electric heaters are marked as short-term group electric heaters; m is a positive integer; m is increased progressively according to the cycle times;

step S4: and step 3 is repeated, and when one group of the voltage stabilizer electric heaters are marked once to be used as the long-term group electric heater and W-1 times to be used as the short-term group electric heater, the group of the voltage stabilizer electric heaters are replaced.

2. The method of operating a potentiostat electric heater as claimed in claim 1, characterized in that W is 4 to 10.

3. The method of operating a potentiostat electric heater of claim 2, wherein in step S1 all the potentiostat electric heaters are divided into 4 zones in planar space with the X and Y axes perpendicular to each other.

4. The method of operating a potentiostat electric heater of claim 3, wherein the potentiostat electric heater is 28 in total number, distributed in two layers.

5. The method of operating a potentiostat electric heater of claim 1, wherein in step S1 the angle between two adjacent potentiostat electric heaters of the same group is greater than 30 °.

6. The method of operating a potentiostat electric heater of claim 4, wherein in step S1 the angle between two adjacent potentiostat electric heaters of the same group is 50 to 130 °.

7. The method of operating a potentiostat electric heater as claimed in claim 1, characterized in that the refueling cycle period is from 1.5 to 2 years.

8. The method of operating a potentiostat electric heater of claim 1, wherein in steps S2-S4, the flags of the long-term group electric heater and the short-term group electric heater are modified by modifying the instrumentation logic.

Technical Field

The invention relates to the technical field of electrical maintenance of nuclear power stations, in particular to an operation method of an electric heater of a voltage stabilizer.

Background

The pressurizer is a key device for maintaining pressure in a primary circuit of a nuclear power plant reactor, and water (water and steam) in a two-phase state is stored in the pressurizer. During normal operation of the nuclear power plant, the water in liquid and gas phase is in dynamic equilibrium, i.e. the pressure in the pressurizer is equal to the saturated vapor pressure of water at an average coolant temperature of 310 ℃. The pressure in the pressure stabilizer is stabilized by timely and dynamically adjusting the spray valve and the electric heater of the pressure stabilizer.

The potentiostat electric heaters are generally divided into two layers, evenly distributed at the bottom of the potentiostat, the lower layer being about 1.5 meters from the bottom and the upper layer being about 2 meters from the bottom. At present, the electric heater of the voltage stabilizer adopts a fixed logic and fixed operation mode. During the running period of the unit, part of the voltage stabilizer electric heaters are in a live running state for a long time, and part of the voltage stabilizer electric heaters are in a frequent start-stop state, so that the unit is called a long-term electric heater; the rest of the voltage stabilizer electric heaters only operate in the start-stop stage of the unit, and each unit only operates for about 1 month in the refueling cycle period (1.5 years), so that the short-term unit electric heaters are called. The long-term group of electric heaters are easy to have heating wire burning faults due to long operation time, and the fault occurrence rate is high, and the replacement period is about 4.5 years. Short-term group electric heaters are easy to have insulation faults, but the fault occurrence rate is not high, and the replacement period is 12 years.

A loop of each unit of a unit of No. 1 and No. 2 of a certain nuclear power station is provided with 1 voltage stabilizer, the voltage stabilizer is provided with 28 electric heaters and divided into two layers, and 14 electric heaters are uniformly distributed at the bottom of each layer. Voltage regulator electric heater numbers 901A, 901B, 901C, 902A, 902B, 902C, 903A, 903B, 903C, 903D, 903E, 903F, 903G, 903H, 904A, 904B, 904C, 904D, 904E, 904F, 904G, 904H, 904J, 904K, 904L, 904M, 904N, 904P, respectively. Wherein 901A, 901B, 901C, 902A, 902B, 902C, 903A, 903B, 903C, 903D, 903E, 903F, 903G and 903H are positioned at the lower layer; 904A, 904B, 904C, 904D, 904E, 904F, 904G, 904H, 904J, 904K, 904L, 904M, 904N, and 904P are located on the upper layer, the profile of which is shown in FIG. 1. The operation control logic of the potentiostat electric heater is shown in table 1.

TABLE 1 operation control logic for prior art potentiostat electric heaters

As can be seen from Table 1, during the operation of the unit, the pressure of the primary circuit is stabilized at about 15.7 MPa. From the actual operation condition, 901A and 901B are in the live-line operation state for a long time during the operation of the unit, and 901C and 903H are pressure regulating groups and are in the frequent start-stop state.

Statistically, in a non-failure situation, the actual runtime of the 4 long-term group electric heaters (901A, 901B, 901C, 903H) is about 39000 hours, and the actual runtime of the 24 short-term group electric heaters is about 4000 hours. Typically, the reliable operation time of the potentiostat electric heater is 20000 hours, it being seen that the operation time of the long-term group electric heater far exceeds the reliable operation time, whereas the operation time of the short-term group electric heater is less than the reliable operation time. The comprehensive utilization rate of the electric heater of the voltage stabilizer is as follows:

(39000×4+4000×24)÷[20000×(24+4)]×100％＝45％。

in summary, the accumulated operation time of the long-term group electric heater and the short-term group electric heater is seriously unbalanced, the comprehensive utilization rate is low, and the failure rate of the long-term group electric heater in the actual operation is obviously higher due to the over-life operation of the long-term group electric heater.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the operation method of the electric heater of the voltage stabilizer is provided, the utilization rate of the electric heater of the voltage stabilizer is improved, and the failure rate is reduced.

The invention provides an operation method of a voltage stabilizer electric heater, which comprises the following steps:

step S1: the method comprises the following steps of performing zoning according to the total number of voltage stabilizer electric heaters, evenly dividing the voltage stabilizer electric heaters into a plurality of zones, wherein the number of the voltage stabilizer electric heaters in each zone is equal, 1 voltage stabilizer electric heater is selected from each zone to form a group, W groups are formed, and adjacent voltage stabilizer electric heaters in the same group are at least separated by two voltage stabilizer electric heaters; w is a positive integer;

step S2: in the 1 st refueling cycle period, selecting one group of voltage stabilizer electric heaters in the step S1 as a long-term group electric heater, and selecting other W-1 groups of voltage stabilizer electric heaters as short-term group electric heaters;

step S3: in the 1+ M material changing cycle period, a group of voltage stabilizer electric heaters which are not marked as long-term group electric heaters in the step S1 is selected to be marked as long-term group electric heaters in the 1+ M material changing cycle period, and other W-1 groups of voltage stabilizer electric heaters are marked as short-term group electric heaters; m is a positive integer; m is increased progressively according to the cycle times;

step S4: and step 3 is repeated, and when one group of the voltage stabilizer electric heaters are marked once to be used as the long-term group electric heater and W-1 times to be used as the short-term group electric heater, the group of the voltage stabilizer electric heaters are replaced.

Preferably, W is 4-10.

Preferably, in step S1, all the potentiostat electric heaters are divided into 4 zones in a planar space with the X axis and the Y axis perpendicular to each other.

Preferably, the total number of the voltage stabilizer electric heaters is 28, and the voltage stabilizer electric heaters are distributed in two layers.

Preferably, the angle between two adjacent potentiostat electric heaters of the same group in step S1 is greater than 30 °.

Preferably, the angle between two adjacent voltage stabilizer electric heaters of the same group in the step S1 is 50-130 degrees.

Preferably, the refueling cycle period is 1.5-2 years.

Preferably, in said steps S2-S4, the signatures of the long-term group electric heaters and the short-term group electric heaters are modified by modifying the instrumentation logic.

Compared with the prior art, the operation method of the voltage stabilizer electric heater comprises the following steps:

step S1: the method comprises the following steps of performing zoning according to the number of total voltage stabilizer electric heaters, evenly dividing the total voltage stabilizer electric heaters into a plurality of zones, wherein the number of the voltage stabilizer electric heaters in each zone is equal, 1 voltage stabilizer electric heater is selected from each zone to form a group, W groups are formed, and adjacent voltage stabilizer electric heaters in the same group are at least separated by two voltage stabilizer electric heaters; w is a positive integer;

step S2: in the 1 st refueling cycle period, selecting one group of voltage stabilizer electric heaters in the step S1 as a long-term group electric heater, and selecting other W-1 groups of voltage stabilizer electric heaters as short-term group electric heaters;

step S3: in the 1+ M material changing cycle period, a group of voltage stabilizer electric heaters which are not marked as long-term group electric heaters are selected and marked as long-term group electric heaters in the 1+ M material changing cycle period, and other W-1 groups of voltage stabilizer electric heaters are marked as short-term group electric heaters; m is a positive integer; m is increased progressively according to the cycle times;

step S4: and step 3 is repeated, and when one group of the voltage stabilizer electric heaters are marked as a long-term group electric heater for one time and W-1 times are used as a short-term group electric heater, the group of the voltage stabilizer electric heaters are replaced.

The operation method of the electric heater of the voltage stabilizer has the following beneficial effects:

(1) the voltage stabilizer electric heaters are marked as long-term group electric heaters in turn, and the running time is balanced, so that the accumulated running time of each electric heater is ensured to be within a reliable running time range, the over-life running of the voltage stabilizer electric heaters is effectively prevented, and the failure rate is reduced.

(2) The electric heater of the voltage stabilizer circularly operates in a logic sequence, so that the utilization rate is effectively improved.

(3) Compared with the prior art, the operation method has the advantages of small change range and convenient implementation.

(4) The operation cost is reduced, the generation amount of radioactive waste is reduced, and the radioactive waste treatment cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a prior art regulator electric heater arrangement;

FIG. 2 is a flow chart of a method of operating a potentiostat electric heater of the present invention;

FIG. 3 is a schematic diagram showing the distribution and division of electric heaters of the voltage stabilizer in embodiment 1;

wherein, 1 is a voltage stabilizer electric heater, 2 is a voltage stabilizer; 901A, 901B, 901C, 902A, 902B, 902C, 903A, 903B, 903C, 903D, 903E, 903F, 903G, 903H, 904A, 904B, 904C, 904D, 904E, 904F, 904G, 904H, 904J, 904K, 904L, 904M, 904N, and 904P are the numbers of the respective regulator electric heaters, respectively.

Detailed Description

For a further understanding of the invention, embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate features and advantages of the invention, and are not intended to limit the invention.

The embodiment of the invention discloses an operation method of an electric heater of a voltage stabilizer, which comprises the following steps, and specifically refers to FIG. 2:

step S1: the method comprises the following steps of performing zoning according to the total number of voltage stabilizer electric heaters, evenly dividing the voltage stabilizer electric heaters into a plurality of zones, wherein the number of the voltage stabilizer electric heaters in each zone is equal, 1 voltage stabilizer electric heater is selected from each zone to form a group, W groups are formed, and adjacent voltage stabilizer electric heaters in the same group are at least separated by two voltage stabilizer electric heaters; w is a positive integer;

step S2: in the 1 st refueling cycle period, selecting one group of voltage stabilizer electric heaters in the step S1 as long-term group electric heaters, and selecting other voltage stabilizer electric heaters as short-term group electric heaters;

step S3: in the 1+ M material changing cycle period, a group of voltage stabilizer electric heaters which are not marked as long-term group electric heaters are selected and marked as long-term group electric heaters in the 1+ M material changing cycle period, and other W-1 groups of voltage stabilizer electric heaters are marked as short-term group electric heaters; m is a positive integer; w is 4 to 10

Step S4: and (8) repeating the step (S3), and replacing the group of the voltage stabilizer electric heaters after the group of the voltage stabilizer electric heaters in the step (S1) are marked once as the long-term group electric heater and W-1 times as the short-term group electric heater.

The invention adopts a partition operation method matched with a logic sequence to be periodically changed, so that each voltage stabilizer electric heater is effectively utilized, and the over-life operation of the voltage stabilizer electric heater is prevented.

The operation method of the voltage stabilizer electric heater is explained in detail according to the concrete steps as follows:

step S1: the method comprises the following steps of performing zoning according to the total number of voltage stabilizer electric heaters, evenly dividing the voltage stabilizer electric heaters into a plurality of zones, wherein the number of the voltage stabilizer electric heaters in each zone is equal, 1 voltage stabilizer electric heater is selected from each zone to form a group, W groups are formed, and adjacent voltage stabilizer electric heaters in the same group are at least separated by two voltage stabilizer electric heaters; and W is a positive integer.

Preferably, the number of the sections is determined by the number of the required long-term group electric heaters, the number of the sections is equal, and the number of the voltage stabilizer electric heaters in each section is equal.

More preferably, all the voltage stabilizer electric heaters are equally divided into 4-10 groups, i.e. W is 4-10.

It is also preferable that all the potentiostat electric heaters are divided into 4 zones in planar space with the X-axis and the Y-axis perpendicular to each other.

Preferably, the total number of the voltage regulators for electric heating is 28, the voltage regulators are distributed in two layers, and W is 7.

To ensure the heating efficiency of the labeled long-term group of electric heaters and avoid local overheating, at least two potentiostat electric heaters are spaced between adjacent potentiostat electric heaters of the same group in step S1.

Preferably, the angle between two adjacent electrical heaters of the same group is greater than 30 °.

More preferably, the angle between two adjacent electric heaters of the same group is 50-130 °.

Step S2: in the 1 st refueling cycle period, one group of the voltage stabilizer electric heaters in the step S1 is selected to be marked as a long-term group electric heater, and the other voltage stabilizer electric heaters are selected to be marked as short-term group electric heaters.

Step S3: in the 1+ M material changing cycle period, a group of voltage stabilizer electric heaters which are not marked as long-term group electric heaters are selected and marked as long-term group electric heaters in the 1+ M material changing cycle period, and other W-1 groups of voltage stabilizer electric heaters are marked as short-term group electric heaters; m is a positive integer; m is incremented by the number of cycles.

Preferably, the refueling cycle period is 1.5-2 years, and more preferably 1.5 years.

Step S4: and step 3 is repeated, and when one group of the voltage stabilizer electric heaters are marked once to be used as the long-term group electric heater and W-1 times to be used as the short-term group electric heater, the group of the voltage stabilizer electric heaters are replaced.

Preferably, in said steps S2-S4, the signatures of the long-term group electric heaters and the short-term group electric heaters are modified by modifying the instrumentation logic.

Preferably, the potentiostat electric heater is labeled as the long-term group electric heater 1 time and the short-term group electric heater 4-10 times before replacement.

More preferably, the potentiostat electric heater is labeled as the long-term group electric heater 1 time and as the short-term group electric heater 6 times before replacement.

The invention adopts an operation method of regularly alternating logic sequences, and the long-term group electric heaters and the short-term group electric heaters are marked by modifying the instrument control logic circulation, so that each voltage stabilizer electric heater is fully utilized and operates in reliable operation time, and the failure rate is low. The results of the calculation show that the utilization rate of the electric heater of the voltage stabilizer can be doubled by adopting the operation method of the invention.

For further understanding of the present invention, the following detailed description is provided for the operation method of the electric heater of the voltage regulator according to the present invention with reference to the following embodiments, and the scope of the present invention is not limited by the following embodiments.