阅读说明：本技术 一种稳压器安全阀定值和排布方法 (Constant value and arrangement method for safety valve of voltage stabilizer ) 是由 吴丹 丁书华 杜思佳 吴清 冷贵君 刘昌文 任春明 钱立波 申亚欧 王静卉 钟明 于 2020-04-30 设计创作，主要内容包括：本发明涉及压力容器安全系统技术领域,具体涉及一种稳压器安全阀定值和排布方法,所采用的技术方案是：包括以下步骤：假定n组安全阀的定值；根据超压情况下安全阀开启对下游管道造成的载荷大小,确定n组安全阀开启的时间间隔；对n组安全阀的所有排布方式,进行排放载荷测试；从排放载荷测试的结果中,挑选出能够将排放流量峰错开的安全阀定值和排布方式；从而同时确定稳压器安全阀的定值和排布方式。能够确保反应堆系统在发生超压事故下的安全性,以及稳压器排放管线和相关支撑在发生阀门误开启事故时所受载荷和应力在可承受范围之内；能够用于三代压水堆核电厂(站)以及军用核动力装置的稳压器安全阀定值的确定和排布。(The invention relates to the technical field of pressure vessel safety systems, in particular to a constant value and arrangement method of a safety valve of a voltage stabilizer, which adopts the technical scheme that: the method comprises the following steps: assuming the constant values of n groups of safety valves; determining the time interval of opening n groups of safety valves according to the load of the downstream pipeline caused by opening the safety valves under the condition of overpressure; carrying out a discharge load test on all arrangement modes of the n groups of safety valves; selecting safety valve constant values and arrangement modes capable of staggering discharge flow peaks from the results of the discharge load test; thereby simultaneously determining the constant value and the arrangement mode of the safety valve of the voltage stabilizer. The safety of the reactor system under the overpressure accident can be ensured, and the load and stress borne by the discharge pipeline of the voltage stabilizer and the related support when the valve is opened by mistake are within a bearable range; the method can be used for determining and arranging the constant value of the safety valve of the voltage stabilizer of a third-generation pressurized water reactor nuclear power plant (station) and a military nuclear power plant.)

1. A constant value method for a safety valve of a voltage stabilizer is characterized by comprising the following steps:

assuming the constant values of n groups of safety valves;

determining the time interval of opening n groups of safety valves according to the load of the downstream pipeline caused by opening the safety valves under the condition of overpressure;

carrying out a discharge load test on all arrangement modes of the n groups of safety valves;

from the results of the discharge load test, safety valve constant values capable of shifting the discharge flow rate peaks were selected.

2. The pressurizer safety valve rating method of claim 1, wherein from the selected safety valve ratings and configurations, the safety valve rating is selected that provides a minimum peak discharge load and is within a downstream pipeline carrying range.

3. The pressurizer safety valve setting method of claim 2, wherein the setting of the n groups of safety valves is an arithmetic progression assuming the setting of the n groups of safety valves.

4. The pressurizer safety valve rating method of claim 3, wherein the n groups of safety valves have a rating difference of 0.2MPa to 0.3 MPa.

5. The pressurizer safety valve rating method of claim 3, wherein the safety valves are arranged in the following manner: the arrangement is gradually increasing or decreasing in the fluid discharge direction of the pressurizer depending on the magnitude of the assumed value of the safety valve.

6. A safety valve arrangement method for a voltage stabilizer is characterized by comprising the following steps:

assuming the constant values of n groups of safety valves;

determining the time interval of opening n groups of safety valves according to the load of the downstream pipeline caused by opening the safety valves under the condition of overpressure;

carrying out a discharge load test on all arrangement modes of the n groups of safety valves;

and selecting a safety valve arrangement mode capable of staggering the discharge flow peak from the discharge load test result.

7. The arrangement method of safety valves of a pressure stabilizer according to claim 6, characterized in that the constant values of the n groups of safety valves are in an arithmetic progression, assuming constant values of the n groups of safety valves.

8. The pressurizer safety valve arrangement method of claim 7, wherein the n groups of safety valves are arranged in a manner that: the arrangement is gradually increased or decreased in the discharge direction depending on the magnitude of the assumed value of the safety valve.

9. The arrangement method of safety valves of voltage stabilizer according to claim 7, characterized in that the constant value difference of n groups of safety valves is 0.2 MPa-0.3 MPa.

Technical Field

The invention relates to the technical field of pressure vessel safety systems, in particular to a constant value and arrangement method of a safety valve of a voltage stabilizer.

Background

In the design of the safety valve of the pressure stabilizer of the pressurized water reactor nuclear power plant at present, a plurality of groups of safety valves (or pressure relief valves) are generally arranged for system safety and pipeline safety. The design of these safety valves (or pressure relief valves) is critical to the fixed value (opening pressure) of the safety valve and the arrangement of the safety valve.

In the design process of the second generation and the second generation power plants in China, the setting value and the arrangement method of the safety valve of the pressurized water reactor pressure stabilizer are not really mastered. Meanwhile, in the design of a three-generation nuclear power plant, the system is improved and upgraded in many aspects, such as: improvements in safety injection system design, augmentation of regulators, addition of rapid cooling functions, etc., have resulted in the need for redesign of the regulator safety valve (or pressure relief valve).

Disclosure of Invention

Aiming at the technical problem that the nuclear reactor safety system needs to be redesigned, the invention provides a constant value and an arrangement method of a safety valve of a voltage stabilizer, so that the safety system of the reactor can ensure the safety of the system in the event of overpressure accidents.

The invention is realized by the following technical scheme:

nuclear reactor systems are designed with consideration of how to handle specific transients or events, such as: overpressure accidents, false opening accidents of the safety valve of the pressure stabilizer and the like. In order to deal with these accidents, a plurality of safety valves are generally arranged at the outlet of the pressure stabilizer to ensure the safety of the reactor system.

The constant value design and safety valve arrangement design of multiple groups of safety valves are very complicated works, and the requirements of overpressure analysis are met, and the load on a downstream pipeline caused by mistakenly opening the safety valves is guaranteed to be within a certain bearing range.

If during the design, when setting up the definite value of multiunit relief valve to same definite value A, then when the reactor system is after the superpressure accident takes place, when system pressure rises to A definite value, all relief valves are opened simultaneously, though can alleviate the risk that pressure rise caused, however, under this condition, the water seal that multiunit relief valve corresponds is down stream pipeline impact simultaneously, can make discharge load too big, surpasss the limit that the pipeline supported to endanger system safety.

The invention assumes the fixed value of n groups of safety valves;

determining the time interval of opening n groups of safety valves according to the load of the downstream pipeline caused by opening the safety valves under the condition of overpressure;

carrying out a discharge load test on all arrangement modes of the n groups of safety valves;

selecting safety valve constant values and arrangement modes capable of staggering discharge flow peaks from the results of the discharge load test;

selecting a safety valve constant value and an arrangement mode which have the minimum discharge load peak value and are within the bearing range of a downstream pipeline from the selected safety valve constant values and arrangement modes; thereby simultaneously determining the constant value and the arrangement mode of the safety valve of the voltage stabilizer.

Preferably, when assuming the constant values of the n groups of safety valves, the constant values of the n groups of safety valves are in an arithmetic progression.

Preferably, the constant value difference of the n groups of safety valves is 0.2MPa to 0.3 MPa.

The n groups of safety valves are arranged in the following mode: the arrangement is gradually increasing or decreasing in the fluid discharge direction of the pressurizer depending on the magnitude of the assumed value of the safety valve.

The invention has the following advantages and beneficial effects:

the invention obtains the opening time intervals of different safety valves under the assumed constant value design of the safety valves under the condition of overpressure, then carries out a plurality of groups of discharge load tests, and finally determines the proper constant values of the safety valves and the arrangement of the safety valves; the safety of the reactor system under the overpressure accident is ensured, and the load and stress borne by the discharge pipeline of the voltage stabilizer and the related support when the valve is opened by mistake are within a bearable range; the method can be used for determining and arranging the constant value of the safety valve of the voltage stabilizer of a third-generation pressurized water reactor nuclear power plant (station) and a military nuclear power plant.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is a schematic view of a test line according to the present invention;

fig. 3 is a schematic diagram of the flow peak caused to the downstream pipeline after different fixed values of the safety valve are opened successively.

Names of various parts in the drawings:

1-a voltage stabilizer, 2-a pressure relief box, 3-a first safety valve bank, 4-a second safety valve bank and 5-a third safety valve bank.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.