Safety valve discharge capacity testing system and method

Abstract

The invention discloses a safety valve discharge test system and method, and the system comprises a steam generation device which is used for generating saturated steam, and an outlet of the steam generation device is communicated with a gas storage device through a pipeline. An inlet of the gas storage device is connected with an outlet pipeline of the steam generation device, and an outlet is connected with the safety valve through a pipeline. And a flow testing system is arranged on a pipeline for communicating the steam generation device with the gas storage device. And the pressure testing system is arranged on the gas storage device and is used for measuring the internal pressure of the gas storage device. According to the invention, an implementation basis is provided for measuring the discharge amount of the safety valve through steam, the test cost is low, the reliability is high, the test result is credible, and the discharge amount of the large-diameter, large-flow and high-pressure steam safety valve can be accurately measured.

Description

Technical Field

[0001] The present invention belongs to the field of ship power systems, and in particular relates to a safety valve discharge capacity testing system and method. Background Art

[0002] Safety valve discharge is an important safety-related function of the power system, and its discharge volume must be accurately measured to ensure the safe operation of the nuclear power system when the steam pipeline pressure exceeds the limit. In the nuclear power industry and the shipbuilding industry, the steam safety valve discharge volume measurement is mainly tested with water instead of steam for the following reasons:

[0003] 1) Steam testing is less safe;

[0004] 2) Steam testing requires high test support conditions and is costly;

[0005] However, using water instead of steam to conduct the test reduces the accuracy and credibility of the test results. Therefore, there is an urgent need for a device and method for testing the discharge capacity of a safety valve. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a safety valve discharge test system and method to achieve the measurement of the safety valve discharge.

[0007] The object of the present invention is achieved through the following technical solutions: a safety valve discharge capacity testing system, comprising:

[0008] The steam generating device is used to generate saturated steam, and the outlet of the steam generating device is connected to the gas storage device through a pipeline.

[0009] The gas storage device has an inlet connected to the outlet pipeline of the steam generating device, and the outlet is connected to the safety valve through a pipeline.

[0010] A flow rate testing system is provided on the pipeline connecting the steam generating device and the gas storage device.

[0011] The pressure testing system is installed on the gas storage device and is used to measure the internal pressure of the gas storage device.

[0012] Preferably, the steam generating device includes a steam generator and a boiler.

[0013] Preferably, the gas storage device includes a gas storage tank and a gas storage bottle.

[0014] Preferably, the flow testing system includes a flow meter.

[0015] Preferably, the pressure testing system includes a pressure sensor.

[0016] Preferably, the safety valve discharge test system also includes a control system, which controls the steam generating device to generate or stop generating saturated steam, obtains real-time monitoring data from the flow test system and the pressure test system, and calculates the safety valve discharge.

[0017] In addition to providing a safety valve discharge capacity testing system, the present invention further provides a method for measuring the discharge capacity of a safety valve using the above system. The specific steps are as follows:

[0018] Step 1: The steam generator generates saturated steam of a certain pressure and discharges it into the gas storage device through a pipeline. The outlet of the gas storage device is connected to the safety valve to be tested.

[0019] Step 2: Saturated steam is continuously discharged into the gas storage device, and the internal pressure of the gas storage device is tested by the pressure testing system until the internal pressure of the gas storage device stabilizes and reaches the tripping pressure of the safety valve;

[0020] Step 3: Read the flow rate measured by the flow test system when the internal pressure of the gas storage device reaches the safety valve trip pressure, which is the discharge volume of the safety valve.

[0021] Preferably, in step 2, when the saturated pressure inside the gas storage device is less than the tripping pressure of the safety valve, the discharge amount of the safety valve is calculated by the following method:

[0022] Saturated steam is continuously discharged into the gas storage device. When the flow value measured by the flow test system stabilizes, the sum of the flow measurement value of the flow measurement device and the steam reduction in the gas storage device within a certain period of time is calculated, which is the discharge capacity of the safety valve, as shown in the following formula:

[0023] m=m1×(t2-t1)+Δm

[0024] Where m represents the discharge volume of the safety valve, m1 represents the flow measurement value of the flow measurement device, Δm represents the steam reduction in the gas storage device within a certain period of time, t1 represents the calculation start time after the flow measurement value stabilizes, and t2 represents the calculation end time after the flow measurement value stabilizes.

[0025] Preferably, the amount of steam reduced in the gas storage device within a certain period of time is calculated by the following formula:

[0026] Δm=ρ1V-ρ2V

[0027] Wherein, ρ1 represents the steam density corresponding to the pressure P1 in the gas storage device at time t1, ρ2 represents the steam density corresponding to the pressure P2 in the gas storage device at time t2, and V represents the volume of the gas storage device.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The present invention provides a safety valve emission capacity testing system and method. By using this device, it is not necessary to maintain a stable pressure in the gas storage tank. The emission capacity of the safety valve can be obtained by summing the measurement value of the flow meter of the test system and the steam reduction in the gas storage tank, thereby reducing the requirements for the volume of the gas storage tank and the gas production of the boiler.

[0030] The test system provided by the present invention has low test cost, high reliability, and credible test results, and can accurately measure the discharge volume of large-caliber, large-flow, and high-pressure steam safety valves.

[0031] The test method provided by the present invention is applicable to small-volume gas storage devices, shortens the test time, and improves the test safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a test principle diagram of a safety valve discharge test system in an embodiment of the present invention.

[0033] In the figure, 1 is a steam generating device; 2 is a gas storage device; 3 is a safety valve; 4 is a flow testing device; and 5 is a pressure testing device. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0035] like Figure 1 As shown, the technical solution of the present invention provides a safety valve discharge test system, comprising:

[0036] A steam generating device 1 is used to generate saturated steam, and the outlet of the steam generating device 1 is connected to the gas storage device 2 through a pipeline;

[0037] The gas storage device 2 has an inlet connected to the outlet pipeline of the steam generating device 1, and an outlet connected to the safety valve 3 through a pipeline;

[0038] A flow rate testing system 4 is provided on the pipeline connecting the steam generating device 1 and the gas storage device 2;

[0039] The pressure testing system 5 is provided on the gas storage device 2 and is used to measure the internal pressure of the gas storage device 2 .

[0040] In one embodiment of the present invention, the steam generating device 1 includes a steam generator and a boiler.

[0041] In one embodiment of the present invention, the gas storage device 2 includes a gas storage tank and a gas storage bottle.

[0042] In one embodiment of the present invention, the flow testing system 4 includes a flow meter.

[0043] In one embodiment of the present invention, the pressure testing system 5 includes a pressure sensor.

[0044] In one embodiment of the present invention, the safety valve discharge test system also includes a control system, which controls the steam generating device 1 to generate or stop generating saturated steam, obtains real-time monitoring data from the flow test system 4 and the pressure test system 5, and calculates the discharge of the safety valve 3.

[0045] In addition to providing a safety valve discharge capacity testing system, the technical solution of the present invention further provides a method for measuring the discharge capacity of a safety valve using the above system. The specific steps are as follows:

[0046] Step 1: The steam generator 1 generates saturated steam of a certain pressure and discharges it into the gas storage device 2 through a pipeline. The outlet of the gas storage device 2 is connected to the safety valve 3 to be tested.

[0047] Step 2: Saturated steam is continuously discharged into the gas storage device 2, and the internal pressure of the gas storage device 2 is tested by the pressure testing system 5 until the internal pressure of the gas storage device 2 stabilizes and reaches the tripping pressure of the safety valve 3;

[0048] Step 3: Read the flow rate measured by the flow test system 4 when the internal pressure of the gas storage device 2 reaches the safety valve trip pressure. This is the discharge capacity of the safety valve 3. In this embodiment, to measure the discharge capacity of the safety valve, steam generated by the boiler is delivered to the gas storage tank. The pressure within the gas storage tank is the safety valve inlet pressure. Ideal test conditions require a stable pressure within the gas storage tank during the safety valve discharge process, which requires a large gas storage tank volume. The flow rate measured by the flow meter at this time is the safety valve discharge capacity. However, ideal test conditions require a high gas storage tank volume.

[0049] In one embodiment of the present invention, to address situations where test conditions are not met for small gas tank volumes, this embodiment provides a method for measuring the discharge volume of a safety valve. This method only requires the flow rate measured by the flowmeter to be stable during the discharge process, without requiring the pressure within the gas tank to remain stable. In this embodiment, the principle of measuring the discharge volume of a safety valve is based on the law of conservation of mass. The discharge volume of the safety valve is equal to the flowmeter's measured value m1 and the reduction in the amount of steam within the gas tank. The reduction in steam within the gas tank is calculated as Δm, based on the steam density (ρ1-ρ2) corresponding to the pressure (P1-P2) within the gas tank during a certain period of time (t2-t1) during the discharge process.

[0050] In this embodiment, the measurement method is as follows:

[0051] Step 1: Generate saturated steam of a certain pressure through the boiler and discharge it into a gas storage tank of a certain volume. The outlet of the gas storage tank is connected to the safety valve to be tested.

[0052] Step 2: The steam generated by the boiler is continuously discharged into the gas storage tank, so that the pressure in the gas storage tank reaches the safety valve tripping pressure.

[0053] Step 3: Install a flow meter between the boiler and the gas tank. The discharge volume of the safety valve is the sum of the flow meter measurement value and the reduction in the steam volume in the gas tank.

[0054] Saturated steam is continuously discharged into the gas storage device 2. When the flow value measured by the flow test system 4 stabilizes, the sum of the flow measurement value of the flow measurement device 4 and the steam reduction in the gas storage device 2 within a certain period of time is calculated, which is the discharge amount of the safety valve 3, as shown in the following formula:

[0055] m=m1×(t2-t1)+Δm

[0056] Where m represents the discharge volume of the safety valve, m1 represents the flow measurement value of the flow measurement device, Δm represents the steam reduction in the gas storage device within a certain period of time, t1 represents the calculation start time after the flow measurement value stabilizes, and t2 represents the calculation end time after the flow measurement value stabilizes.

[0057] In this embodiment, the amount of steam reduced in the gas storage device 2 within a certain period of time is calculated by the following formula:

[0058] Δm=ρ1V-ρ2V

[0059] Wherein, ρ1 represents the steam density corresponding to the pressure P1 in the gas storage device at time t1, ρ2 represents the steam density corresponding to the pressure P2 in the gas storage device at time t2, and V represents the volume of the gas storage device.

[0060] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A safety valve discharge test system, characterized by: The test system comprises: A steam generating device (1) for generating saturated steam, wherein an outlet of the steam generating device (1) is connected to a gas storage device (2) via a pipeline; A gas storage device (2), the inlet of which is connected to the outlet pipeline of the steam generating device (1), and the outlet of which is connected to the safety valve (3) through a pipeline; A flow rate testing system (4) is provided on the pipeline connecting the steam generating device (1) and the gas storage device (2); A pressure testing system (5) is provided on the gas storage device (2) and is used to measure the internal pressure of the gas storage device (2).

2. A safety valve discharge test system according to claim 1, characterized in that: The steam generating device (1) comprises a steam generator and a boiler.

3. A safety valve discharge test system according to claim 2, characterized in that: The gas storage device (2) comprises a gas storage tank and a gas storage bottle.

4. A safety valve discharge test system according to claim 3, characterized in that: The flow rate testing system (4) comprises a flow meter.

5. A safety valve discharge test system according to claim 4, characterized in that: The pressure testing system (5) comprises a pressure sensor.

6. A safety valve discharge test system according to claim 5, characterized in that: The safety valve discharge test system further comprises a control system, wherein the control system controls the steam generating device (1) to generate or stop generating saturated steam, and the control system obtains real-time monitoring data from the flow test system (4) and the pressure test system (5) to calculate the discharge of the safety valve (3).

7. A method for testing the discharge volume of a safety valve, characterized by: The safety valve discharge capacity test system according to any one of claims 1 to 6 is used to calculate and test the safety valve discharge capacity, and the method comprises the following steps: Step 1: The steam generating device (1) generates saturated steam of a certain pressure, which is discharged into the gas storage device (2) through a pipeline, and the outlet of the gas storage device (2) is connected to the safety valve (3) to be tested; Step 2: Saturated steam is continuously discharged into the gas storage device (2), and the internal pressure of the gas storage device (2) is tested by the pressure testing system (5) until the internal pressure of the gas storage device (2) is stable and reaches the tripping pressure of the safety valve (3); Step 3: Read the flow rate measured by the flow test system (4) when the internal pressure of the gas storage device (2) reaches the safety valve tripping pressure, which is the discharge volume of the safety valve (3).

8. A method for testing discharge volume of a safety valve according to claim 7, characterized in that: In step 2, when the internal saturation pressure of the gas storage device (2) is less than the tripping pressure of the safety valve (3), the discharge amount of the safety valve (3) is calculated by the following method: Saturated steam is continuously discharged into the gas storage device (2). When the flow rate value measured by the flow test system (4) is stable, the sum of the flow rate measurement value of the flow measurement device (4) and the steam reduction amount in the gas storage device (2) within a certain period of time is calculated, which is the discharge amount of the safety valve (3), as shown in the following formula: m=m1×(t2-t1)+Δm Where m represents the discharge volume of the safety valve, m1 represents the flow measurement value of the flow measurement device, Δm represents the steam reduction in the gas storage device within a certain period of time, t1 represents the calculation start time after the flow measurement value stabilizes, and t2 represents the calculation end time after the flow measurement value stabilizes.

9. A method for testing discharge volume of a safety valve according to claim 8, characterized in that: The amount of steam reduced in the gas storage device (2) within a certain period of time is calculated by the following formula: Δm=ρ1V-ρ2V Wherein, ρ1 represents the steam density corresponding to the pressure P1 in the gas storage device at time t1, ρ2 represents the steam density corresponding to the pressure P2 in the gas storage device at time t2, and V represents the volume of the gas storage device.

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