Test loop for simulating steam generator with or without axial economizer and test method thereof

Patent metadata

Field	Value
Publication number	US-11754281-B2
Application number	US-202117646201-A
Country	US
Kind code	B2
Filing date	Dec 28, 2021
Priority date	Dec 30, 2020
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

Disclosed are a test loop for simulating a steam generator with or without an axial economizer and a test method thereof. The loop includes a cooling water loop, a water supply loop, a recirculated water loop and a power supply. The cooling water loop is used for condensing and cooling wet steam and providing the wet steam to the water supply loop and the recirculated water loop. The water supply loop is used for providing cold-state water supply for a test device, the recirculated water loop is used for reheating cooled water to be saturated and providing the water to the test device. The power supply is used for supplying power to heating equipment and an electric heater in the test device. The present disclosure provides a test method of the loop. Simulation tests can be carried out on a steam generator with or without an axial economizer.

First claim

What is claimed is:

1. A test loop for simulating a steam generator with or without an axial economizer, comprising a cooling water loop, a water supply loop, a recirculated water loop and a power supply, wherein the cooling water loop is used for condensing and cooling wet steam and providing the wet steam to the water supply loop and the recirculated water loop, the water supply loop is configured for providing cold-state water to a test device for simulating the steam generator with or without an axial economizer, the recirculated water loop is configured for reheating cooled water to be saturated and providing the cooled water heated to the test device, the power supply is configured for supplying power to heating equipment in the test device, and the heating equipment in the test device comprises non-uniform heat flux electric heating rods which are divided into a left group and a right group and configured for simulating a hot side and a cold side of a U-shaped tube bundle in the steam generator;
the cooling water loop comprises a second water tank, a cooling tower, a condenser, a second regulating valve, a third regulating valve and a first circulating pump, wherein an outlet of the second water tank communicates with the first circulating pump, an outlet of the first circulating pump communicates with a pipe side inlet of the condenser, a pipeline communicating with the first circulating pump and the condenser is provided with the second regulating valve, a pipe side outlet of the condenser communicates with an inlet of the cooling tower, and an outlet of the cooling tower communicates with an inlet of the second water tank;
the water supply loop comprises a wet steam outlet, the condenser, a first water tank, a test section first inlet, a first regulating valve, a fourth regulating valve, a fifth regulating valve, a second circulating pump and a third circulating pump, wherein a shell side outlet of the condenser communicates with the second circulating pump, an outlet of the second circulating pump communicates with an inlet of the first water tank, a pipeline communicating with the second circulating pump and the first water tank is provided with the first regulating valve, an outlet of the first water tank communicates with the third circulating pump, an outlet of the third circulating pump communicates with the test section first inlet of the test device, a pipeline communicating with the third circulating pump and the test section first inlet is sequentially provided with a fifth regulating valve, a first thermometer, a first pressure meter and a second flow meter, the wet steam outlet in a top of the test device communicates with a shell side inlet of the condenser, and a pipeline communicating with the wet steam outlet and the condenser is provided with a third thermometer and a third pressure meter;
the recirculated water loop comprises the wet steam outlet, the condenser, an electric heater, a test section second inlet, a seventh regulating valve and the second circulating pump, wherein a pipeline between the shell side outlet of the condenser and the second circulating pump is shared with the water supply loop, an outlet of the second circulating pump further communicates with an inlet of the electric heater, an outlet of the electric heater communicates with the test section second inlet of the test device, a pipeline between the outlet of the electric heater and the test section second inlet is sequentially provided with a first flow meter, the seventh regulating valve, a second thermometer, a second pressure meter and a third flow meter, and a pipeline between the wet steam outlet of the test device and the condenser is shared with the water supply loop; two branches are provided between the recirculated water loop and the water supply loop, one branch of the two branches is located between a pipeline from the first flow meter to the seventh regulating valve in the recirculated water loop and a pipeline from the fifth regulating valve to the first thermometer in the water supply loop, and the one branch is provided with a check valve; and another branch of the two branches is located between a pipeline from the seventh regulating valve to the second thermometer in the recirculated water loop and a pipeline from the second flow meter to the test section first inlet in the water supply loop, and the another branch is provided with an eighth regulating valve.

2. The test loop for simulating the steam generator with or without the axial economizer according to claim 1 , wherein the test device comprises a cylindrical barrel, the wet steam outlet is formed in a top of the cylindrical barrel, two sides of a lower part of the cylindrical barrel respectively communicate with downcomer section simulation pipes, and a bottom end of the cylindrical barrel is connected with a detachable base; a plurality of non-uniform heat flux heating rod bundles are arranged in the cylindrical barrel in an axial direction; the non-uniform heat flux heating rod bundles are divided into a left group as left rod bundles and a right group as right rod bundles, by a central divider plate; the left rod bundles are used for simulating the cold side of the U-shaped tube bundle in the steam generator, and the right rod bundles are used for simulating the hot side of the U-shaped tube bundle in the steam generator.

3. The test loop for simulating the steam generator with or without the axial economizer according to claim 1 , wherein under a condition that the check valve is closed, the test loop for the steam generator with the axial economizer is provided; under a condition that the check valve is open, the test loop for the steam generator without the axial economizer is provided; and the eighth regulating valve is used for distributing recirculated water, simulating working condition under a condition of the steam generator with the axial economizer and also participating in a function of switching the test loop.

4. The test loop for simulating the steam generator with or without the axial economizer according to claim 1 , wherein the outlet of the third circulating pump in the water supply loop is provided with a bypass branch, and the bypass branch is provided with the fourth regulating valve.

5. The test loop for simulating the steam generator with or without the axial economizer according to claim 1 , wherein the outlet of the first circulating pump in the cooling water loop is provided with a bypass branch, and the bypass branch is provided with the third regulating valve.

6. The test loop for simulating the steam generator with or without the axial economizer according to claim 1 , wherein the test loop is a closed loop, and air spaces are reserved in the first water tank and the second water tank and play a role of a pressure stabilizer.

7. A test method of a test loop for simulating a steam generator with or without an axial economizer, wherein the test loop for simulating the steam generator with or without the axial economizer comprises a cooling water loop, a water supply loop, a recirculated water loop and a power supply, wherein the cooling water loop is used for condensing and cooling wet steam and providing the wet steam to the water supply loop and the recirculated water loop, the water supply loop is configured for providing cold-state water to a test device for simulating the steam generator with or without an axial economizer, the recirculated water loop is configured for reheating cooled water to be saturated and providing the cooled water heated to the test device, the power supply is configured for supplying power to heating equipment in the test device, and the heating equipment in the test device comprises non-uniform heat flux electric heating rods which are divided into a left group and a r

Assignees

• Univ Xi An Jiaotong

Inventors

• Tian Wenxi
• Zeng Chunjie
• Wang Mingjun
• Wang Yingjie
• Qiu Suizheng
• Su Guanghui

Classifications

• G01M99/002 Primary

  Thermal testing (flaw detection G01N25/72) · CPC title

• F22B37/423 Primary

  Valves for testing steam generators · CPC title

• F22B1/282

  with water or steam circulating in tubes or ducts · CPC title

• F22B35/08

  of forced-circulation type · CPC title

• F22B37/426

  Feed-water supply alarm devices using electric signals · CPC title