A device for discharging liquid metal in a pipeline and rapidly cooling the pipeline

Abstract

The present invention discloses a device for discharging liquid metal in a pipeline and rapidly cooling the pipeline. The outlet of the liquid metal pipeline is connected to an outlet isolation valve, a liquid metal storage tank, an air cooler, a fine filter and a circulating fan in sequence and is connected to the inlet of an electric heater; the outlet of the electric heater is divided into two paths, one of which is connected to the inlet of the liquid metal pipeline through an inlet isolation valve, and the other is connected to the inlet of the air cooler through a recirculation valve. The outlet of the nitrogen tank is connected to the inlet of the outlet pipeline through a pressure regulating valve, the outlet of the liquid metal storage tank is connected to the inlet of the outlet pipeline, and the outlet of the outlet pipeline is connected to the inlet of the air cooler. The device can discharge the liquid metal in the pipeline and realize rapid cooling of the pipeline at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid metal discharge and pipeline cooling in pipelines, and relates to a device for liquid metal discharge and pipeline rapid cooling in pipelines. Background Art

[0002] New fourth-generation reactors usually use active metals (sodium, potassium or lithium) as coolants. The main equipment of the first and second circuits are in a liquid metal working environment. Usually, the pipeline with liquid metal as the working medium is designed with a certain slope. The outer wall of the pipeline is wrapped with electric heating wire to heat the metal in the pipeline to prevent the liquid metal from solidifying. When the equipment on the pipeline is replaced or repaired, the liquid metal is discharged into the liquid metal storage tank by gravity. The gravity self-flow liquid metal discharge speed is slow; there is a lot of liquid metal residue in the pipeline, which is not conducive to equipment maintenance and increases the workload of residual sodium cleaning; after the liquid metal is discharged, air may leak into the pipeline, causing the quality of the liquid metal to deteriorate; the pipeline relies on natural cooling, and it takes a long time to cool down. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device for discharging liquid metal in a pipeline and rapidly cooling the pipeline, which can discharge the liquid metal in the pipeline and realize rapid cooling of the pipeline at the same time.

[0004] To achieve the above-mentioned purpose, the device for discharging liquid metal in a pipeline and rapidly cooling the pipeline of the present invention comprises an outlet pipeline, a liquid metal pipeline, a liquid metal storage tank, an air cooler, a fine filter, a circulating fan, an electric heater, an inlet isolation valve, a recirculation valve, a pressure regulating valve and a nitrogen tank;

[0005] The outlet of the liquid metal pipeline is connected in sequence to the outlet isolation valve, the liquid metal storage tank, the air cooler, the fine filter and the circulating fan and the inlet of the electric heater;

[0006] The outlet of the electric heater is divided into two paths, one of which is connected to the inlet of the liquid metal pipeline through an inlet isolation valve, and the other is connected to the inlet of the air cooler through a recirculation valve.

[0007] The outlet of the nitrogen tank is connected to the inlet of the outlet pipeline through a pressure regulating valve, the outlet of the liquid metal storage tank is connected to the inlet of the outlet pipeline, and the outlet of the outlet pipeline is connected to the inlet of the air cooler.

[0008] An outlet isolation valve is provided between the liquid metal pipeline and the liquid metal storage tank.

[0009] A molecular sieve bed is provided between the air cooler and the fine filter.

[0010] The outlet of the electric heater is divided into two paths after passing through the flow sensor.

[0011] A temperature sensor is arranged at the outlet of the electric heater, wherein the temperature sensor is locked to the electric heater.

[0012] A pressure sensor is installed on the outlet pipeline, and the pressure sensor is locked with the pressure regulating valve.

[0013] The molecular sieve bed adsorbs gas impurities from the gas stream.

[0014] Fine filters remove solid impurity particles from the air flow.

[0015] The present invention has the following beneficial effects:

[0016] During specific operation of the device for discharging liquid metal in a pipeline and rapidly cooling the pipeline described in the present invention, when it is necessary to discharge the liquid metal in the pipeline, the circulating fan is used to drive the high-temperature nitrogen heated by the electric heater to push and carry the liquid metal into the liquid metal storage tank for storage; when cooling is required, the circulating fan is used to drive the high-temperature gas in the liquid metal pipeline to flow through the air cooler for closed-loop cooling, thereby achieving rapid cooling of the pipeline, shortening the cooling time, and facilitating equipment maintenance; the nitrogen in the pipeline also serves as a protective gas to prevent air leakage and ensure the quality of the liquid metal.

[0017] Furthermore, the recirculation valve controls the cooling speed, the temperature sensor and the electric heater control the nitrogen temperature, the impurities in the nitrogen are removed by the molecular sieve bed and the fine filter, the nitrogen in the system is provided by the nitrogen tank, and the nitrogen pressure is controlled by the pressure regulating valve according to the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Among them, 1 is a liquid metal pipeline, 2 is an outlet isolation valve, 3 is a liquid metal storage tank, 4 is a pressure sensor, 5 is an air cooler, 6 is a molecular sieve bed, 7 is a fine filter, 8 is a circulating fan, 9 is an electric heater, 10 is a temperature sensor, 11 is a flow sensor, 12 is an inlet isolation valve, 13 is a recirculation valve, 14 is a pressure regulating valve, and 15 is a nitrogen tank. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0021] refer to Figure 1The device for discharging liquid metal in a pipeline and rapidly cooling the pipeline of the present invention comprises a liquid metal pipeline 1, an outlet isolation valve 2, a liquid metal storage tank 3, a pressure sensor 4, an air cooler 5, a molecular sieve bed 6, a fine filter 7, a circulating fan 8, an electric heater 9, a temperature sensor 10, a flow sensor 11, an inlet isolation valve 12, a recirculation valve 13, a pressure regulating valve 14 and a nitrogen tank 15; the outlet of the liquid metal pipeline 1 is connected to the outlet isolation valve 2, the liquid metal storage tank 3, the outlet pipeline, the air cooler 5, the molecular sieve bed 6, the fine filter 7, the circulating fan 8 and the electric heater 9 in sequence and is connected to the inlet of the flow sensor 11; the outlet of the flow sensor 11 is divided into two paths, one of which is connected to the inlet of the liquid metal pipeline 1 through the inlet isolation valve 12, and the other is connected to the inlet of the air cooler 5 through the recirculation valve 13.

[0022] The outlet of the nitrogen tank 15 is connected to the inlet of the outlet pipe via the pressure regulating valve 14 , the outlet of the liquid metal storage tank 3 is connected to the inlet of the outlet pipe, and the outlet of the outlet pipe is connected to the inlet of the air cooler 5 .

[0023] The molecular sieve bed 6 is used to adsorb gas impurities in the air flow, and the fine filter 7 is used to filter solid impurity particles in the air flow.

[0024] A pressure sensor 4 is installed on the outlet pipeline, and the pressure sensor 4 is locked with the pressure regulating valve 14 to ensure that the nitrogen pressure in the system is 0.1-0.2MPa.

[0025] A temperature sensor 10 is provided at the outlet of the electric heater 9, and the temperature sensor 10 is locked to the electric heater so that the temperature of the circulating nitrogen at the outlet of the electric heater 9 is 40-200°C.

[0026] When the air cooler 5 is put into operation, the flow rate of cooling nitrogen flowing through the liquid metal pipeline 1 can be controlled by adjusting the opening of the recirculation valve 13 to ensure that the temperature of the liquid metal pipeline 1 can be controlled to drop.

[0027] The specific working process of the present invention is:

[0028] 1) Close the outlet isolation valve 2 and the inlet isolation valve 12, and do not put the air cooler 5 into operation;

[0029] 2) Open the pressure regulating valve 14, and the nitrogen output from the nitrogen tank 15 enters the air cooler 5;

[0030] 3) adjusting the opening of the pressure regulating valve 14 according to the pressure signal detected by the pressure sensor 4 so that the nitrogen pressure at the outlet of the pressure regulating valve 14 is 0.1-0.2 MPa;

[0031] 4) Open the recirculation valve 13 and start the circulation fan 8;

[0032] 5) controlling the electric heater 9 according to the nitrogen temperature detected by the temperature sensor 10, so that the nitrogen temperature detected by the temperature sensor 10 is 190-200°C;

[0033] 6) Open the outlet isolation valve 2 and the inlet isolation valve 12, and adjust the opening of the recirculation valve 13 to 20%;

[0034] 7) After the liquid level of the liquid metal storage tank 3 stops rising, close the recirculation valve 13, and then run the circulation fan 8 for 20 minutes to ensure that the liquid metal is completely discharged, and then turn off the electric heater 9;

[0035] 8) Open the recirculation valve 13 and put the air cooler 5 into operation so that the temperature difference between the cooling nitrogen and the liquid metal pipeline 1 does not exceed 50°C;

[0036] The opening of the recirculation valve 13 is adjusted to control the flow of cooling nitrogen flowing through the liquid metal pipeline 1, and the cooling rate of the liquid metal pipeline 1 is controlled not to exceed 60°C / h, and finally the temperature of the liquid metal pipeline 1 is reduced to close to room temperature, which is convenient for pipeline equipment maintenance.

Claims

1. A device for discharging liquid metal from a pipeline and rapidly cooling the pipeline, characterized in that: It comprises an outlet pipeline, a liquid metal pipeline (1), a liquid metal storage tank (3), an air cooler (5), a fine filter (7), a circulating fan (8), an electric heater (9), an inlet isolation valve (12), a recirculation valve (13), a pressure regulating valve (14) and a nitrogen tank (15); The outlet of the liquid metal pipeline (1) is connected in sequence to the outlet isolation valve (2), the liquid metal storage tank (3), the air cooler (5), the fine filter (7) and the circulating fan (8) and is connected to the inlet of the electric heater (9); The outlet of the electric heater (9) is divided into two paths, one of which is connected to the inlet of the liquid metal pipeline (1) through the inlet isolation valve (12), and the other is connected to the inlet of the air cooler (5) through the recirculation valve (13); The outlet of the nitrogen tank (15) is connected to the inlet of the outlet pipe via the pressure regulating valve (14), the outlet of the liquid metal storage tank (3) is connected to the inlet of the outlet pipe, and the outlet of the outlet pipe is connected to the inlet of the air cooler (5).

2. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 1, characterized in that: An outlet isolation valve (2) is provided between the liquid metal pipeline (1) and the liquid metal storage tank (3).

3. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 1, characterized in that: A molecular sieve bed (6) is arranged between the air cooler (5) and the fine filter (7).

4. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 1, characterized in that: The outlet of the electric heater (9) is divided into two paths after passing through a flow sensor (11).

5. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 1, characterized in that: A temperature sensor (10) is arranged at the outlet of the electric heater (9), wherein the temperature sensor (10) is locked to the electric heater (9).

6. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 1, characterized in that: A pressure sensor (4) is installed on the outlet pipeline, and the pressure sensor (4) is locked with a pressure regulating valve (14).

7. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 3, characterized in that: The molecular sieve bed (6) adsorbs gas impurities in the gas flow.

8. The device for discharging liquid metal from a pipeline and rapidly cooling the pipeline according to claim 1, characterized in that: The fine filter (7) filters solid impurity particles in the air flow.

Images