Static test device for pressure interlocking protection system

Abstract

The utility model mainly relates to the technical field of pipeline manufacturing and design, aims to improve the completeness and reliability of a static test of a pressure interlocking protection system, and provides a static test device of a pressure interlocking protection system, which mainly comprises a pressure process pipeline, a pressure tapping pipeline, a pressure sensor, a pressure tapping primary valve, a three-way valve and a pressure pump, a pressure outlet of a pressure process pipeline is connected with a pressure tapping pipeline for pressure inlet through a pressure tapping primary valve, a pressure outlet of the pressure tapping pipeline is connected with a first connector of a three-way valve, a second connector of the three-way valve is connected with a pressure sensor, and a third connector of the three-way valve is connected with a pressure pump through a connecting device. The state of the pressure sampling pipeline is included in the static test range, the conduction state and leakage points of the pressure sampling pipeline and the pressure sampling primary valve can be better determined in the static test of the pressure interlocking protection device by observing the pressure reduction condition in the pressure relief process, and the whole-flow pressure of the whole pressure interlocking protection system is detected in the static test.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to pressure test technical field, especially a pressure interlock protection system static test device. BACKGROUND

[0002] In the liquor production and supply boiler and steam turbine system (hereinafter referred to as host computer) for meeting the production requirements, host computer load changes greatly, pressure fluctuates frequently, in order to guarantee the safety, reliability and stability of host computer operation, there are numerous pressure interlock protection systems, these systems are important guarantee for safe operation of liquor production energy supply, pressure interlock system is put into operation with host computer, compares detected pressure with set pressure in time, when process reaches set pressure limit value, interlock protection system will send stop command, ensures that host computer equipment will not run in overpressure state, thereby plays the role of protecting host computer and operating personnel safety. Figure 1 As shown, process pressure (i.e. the pressure of host computer work) is transmitted to pressure sensor (usually electric contact pressure gauge or pressure switch) through pressure pipeline, and the pressure value measured by pressure sensor is compared with set interlock action pressure value, reaches action value, triggers interlock action, outputs stop signal, and host computer stops running. In order to ensure that pressure interlock protection system can reliably detect process pressure, effectively judge whether process pressure endangers equipment safety, and can send stop command in time when process pressure endangers safety of pressure interlock protection system, so that pressure interlock protection system stops running, it is necessary to test these pressure interlock protection systems regularly. Actual test includes hot state test and static test, wherein static test is an important link, which is usually carried out before host computer starts, to find possible safety hazards in host computer operation in advance. Static test is to trigger interlock by changing the interlock pressure setting value of field pressure sensor (usually pressure switch or electric contact pressure gauge), which has a big defect, and the pressure sampling and transmission process is not tested, i.e. Figure 1 The reliability of the equipment in the dashed box is not detected, and the whole process test is not reached, and the specific risks include:

[0003] 1. Pressure pipeline and valve blockage or leakage will cause the pressure sensor to detect incorrect pressure value or low pressure when the process pressure is over limit, and the interlock system refuses to act;

[0004] 2. Pressure sensor system failure will cause the sensor to not output pressure value or inaccurate pressure value, and the interlock system refuses to act or misacts;

[0005] 3. Misaction caused by large measurement error of pressure sensor. INVENTION CONTENTS

[0006] The utility model wants to solve the technical problem of providing a pressure interlock protection system static test device, improve the completeness and reliability of pressure interlock protection system static test.

[0007] The utility model adopts the technical scheme of solving the above technical problem:

[0008] Pressure interlock protection system static test device, the device includes pressure process pipeline, pressure pipeline, pressure sensor, pressure taking primary valve, three way valve and pressure pump, the pressure pump is used for producing the air pressure for static test, the air pressure size produced by pressure pump is greater than or equal to the limit pressure of pressure interlock protection system to be inspected;Pressure process pipeline outlet pressure port is connected through pressure taking primary valve and the inlet pressure port of pressure pipeline, and the outlet pressure port of pressure pipeline is connected with the first interface of three way valve, and the second interface of three way valve is connected with pressure sensor, and the third interface of three way valve is connected with pressure pump through connecting device.

[0009] Further, the connecting device includes a hose and two conversion joints, and the hose is connected with the third interface of the three-way valve and the pressure outlet of the pressure pump through a conversion joint at both ends.

[0010] Further, the pressure pump is provided with a pressure detection table with an accuracy level of 0.1.

[0011] Further, the device further comprises a pressure adjusting knob and a pressure handle, the pressure handle is used to drive the pressure pump to generate air pressure, and the pressure adjusting knob is connected with the pressure pump and used to set the air pressure of the pressure pump.

[0012] The utility model has the advantages of:

[0013] (1) the utility model discloses a three-way valve on pressure pipeline, moves the test intervention point in pressure interlock protection system, and the state of pressure pipeline is included in static test range, and the conduction state and potential leakage point of pressure pipeline and sampling valve can be determined better in pressure interlock protection system static test by observing the pressure reduction in pressure relief process, so that the whole pressure interlock protection system flow process can be detected in static test.

[0014] (2) the high-accuracy level (0.1 level) pressure detection table is introduced in the experimental device to detect the output pressure of the pressure pump, and the action pressure range of the pressure interlock protection system can be tested, so that the action critical pressure of the pressure interlock protection system can be determined more accurately, and the risk of false triggering of the protection action due to inaccurate action pressure in the running process can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The pressure interlock protection system workflow diagram is provided.

[0016] Figure 2 This is a schematic diagram of the static test device for the pressure interlock protection system.

[0017] 1. Pressure gauge; 2. Pressure adjustment knob; 3. Pressurization handle; 4. Pressurization pump; 5. Hoses; 6. Adapter; 7. Pressure sensor; 8. Three-way valve; 9. Pressure tapping pipeline; 10. Primary pressure tapping valve; 11. Pressure process pipeline. A indicates the connected state of the three-way valve when the pressure interlock protection system is operating normally; B indicates the connected state of the three-way valve when the simulated ultimate pressure triggers the interlock protection; C indicates the connected state of the three-way valve when detecting the conduction of the pressure sampling pipeline and sampling valve. Detailed Implementation

[0018] like Figure 2 As shown, the static test device of the pressure interlock protection system includes a pressure process pipeline 11, a primary pressure tapping valve 10, a pressure tapping pipeline 9, a three-way valve 8, a pressure sensor 7, and a pressurizing pump 4. The pressurizing pump 4 is used to provide the air pressure for the static test. The pressure outlet of the pressure process pipeline 11 is connected to the pressure inlet of the pressure tapping pipeline 9 through the primary pressure tapping valve 10. The pressure outlet of the pressure tapping pipeline 9 is connected to the first interface of the three-way valve 8. The second interface of the three-way valve 8 is connected to the pressure sensor 7. The third interface of the three-way valve 8 is connected to the pressurizing pump 4 through a connecting device.

[0019] The booster pump 4 selects air or water as the pressure source according to the actual needs of the site. It simulates the process pressure in the pressure interlock protection system to drive the interlock protection system to act, and can generate a pressure greater than or equal to the limit pressure to be tested.

[0020] In this embodiment, the connecting device includes a hose 5 and two adapters 6. The two ends of the hose 5 are respectively connected to the third port of the three-way valve 8 and the pressure outlet of the pressure pump 4 through an adapter 6.

[0021] To facilitate pressurization of the pressure pump 4 and control the pressure output from the pressure pump 4 to the pressure tapping pipeline 9, the pressure pump 4 is equipped with a pressure adjustment knob 2 and a pressure handle 3. The pressure handle 3 is used to drive the pressure pump 4 to generate pressure, and the pressure adjustment knob 2 is connected to the pressure pump 4 to set the air pressure. Additionally, the pressure pump 4 is equipped with a pressure gauge 1 to detect the pressure output from the pressure pump 4 to the pressure process pipeline 11. The pressure gauge 1 is a digital pressure gauge with an accuracy class of 0.1.

[0022] The method for conducting static tests on a pressure interlock protection system using a static testing device is as follows:

[0023] When the pressure interlock protection system is operating normally, the three-way valve 8 is in the connected state as follows: Figure 2The first and second interfaces of the three-way valve 8 are opened, the third interface is closed, the pressure process pipeline 11 is communicated with the pressure sensor 7 (the pressure sensor 7 is a pressure switch or an electric contact pressure gauge), and the pressure sensor 7 is put into the pressure detection protection state of the pressure process pipeline 11.

[0024] In the static test of the pressure interlocking system, the pressure taking primary valve 10 is closed, the first interface of the three-way valve 8 is closed, and the second and third interfaces of the three-way valve 8 are opened, and the communication state of the three-way valve 8 is Figure 2 The pressure sensor 7 is communicated with the pressure taking pipeline 9, and the pressure sensor 7 is put into the pressure detection protection state of the pressure taking pipeline 9.

[0025] The pressure handle 3 connected with the pressure pump 4 is used to pressurize the pressure pump 4, and the analog process pressure at this time is displayed on the pressure detection gauge 1. When the pressure reaches the set action value, the pressure sensor 7 acts and outputs an action signal, and the external DCS system generates a related alarm and a shutdown interlocking action output. The pressure value at this time is the shutdown protection action value of the pressure interlocking protection system, and the accuracy level can reach 0.1 level, which is much higher than the original 1.6 level or 0.5 level.

[0026] The communication state of the three-way valve 8 is changed to that the first, second and third interfaces are all opened, so that the pressure pump 4 is communicated with the pressure sensor 7 and the pressure process pipeline 11, as shown in Figure 2 The residual pressure in the pipeline is released to the entire pressure taking pipeline 9, and when the set back pressure of the pressure sensor 7 is reached, the related protection action of the external DCS system returns to the normal state, and the interlocking protection action is released.

[0027] During the pressure release process, the pressure release speed should also be controlled. On the one hand, the back difference value of the pressure sensor 7 is recorded, and on the other hand, the pressure drop is observed to judge the communication state of the pressure taking pipeline 9. If the residual pressure cannot be rapidly reduced after the three-way valve 8 is switched, it is determined that the pressure taking pipeline 9 is blocked. If the residual pressure cannot be stabilized after being reduced to a certain degree, it is determined that the pressure process pipeline 11 or the pressure taking primary valve 10 is leaked, and should be repaired.

[0028] The pressure taking primary valve 10 is opened. In the normal state, the pressure sensor 7 should rapidly return to zero. Otherwise, it is determined that the pressure taking primary valve 10 is blocked, and should be repaired or replaced.

[0029] Finally, the three-way valve 8 is restored to the state A as shown in Figure 2 , and the static test is completed.

[0030] Embodiment:

[0031] The static test results of the boiler pressure interlock protection system by the pressure interlock protection system static test device are shown in Table 1.

[0032] Table 1 Comparison of static test results of boiler pressure interlock protection system

[0033]

[0034] Note: stable pressure range = actual interlock action value / specified interlock protection action value

[0035] Based on the test results of the boiler pressure interlock protection system in Table 1, it can be concluded that the static test effect of the pressure interlock protection system static device is good, the stable operation pressure range can reach 99.92%, and both the electric contact pressure gauge and the pressure switch can detect the state of the sampling pipeline, timely discover and eliminate abnormal states such as pipeline blockage and leakage, and ensure the reliability and stability of the liquor production.

Claims

1. A static test device for a pressure interlock protection system, characterized in that, The device includes a pressure process pipeline, a pressure tapping pipeline, a pressure sensor, a primary pressure tapping valve, a three-way valve, and a pressurizing pump. The pressurizing pump is used to generate the air pressure required for static testing. The air pressure generated by the pressurizing pump is greater than or equal to the limit pressure to be tested by the pressure interlock protection system. The outlet of the pressure process pipeline is connected to the inlet of the pressure tapping pipeline through the primary pressure tapping valve. The outlet of the pressure tapping pipeline is connected to the first port of the three-way valve. The second port of the three-way valve is connected to the pressure sensor. The third port of the three-way valve is connected to the pressurizing pump through a connecting device.

2. The static test device for the pressure interlock protection system according to claim 1, characterized in that, The connection device includes a hose and two adapters. The two ends of the hose are connected to the third port of the three-way valve and the outlet of the pressure pump through an adapter, respectively.

3. The static test device for the pressure interlock protection system according to claim 1, characterized in that, The pressurization pump is equipped with a pressure gauge with an accuracy class of 0.

1.

4. The static test apparatus for the pressure interlock protection system according to any one of claims 1-3, characterized in that, The device also includes a pressure adjustment knob and a pressurizing handle. The pressurizing handle is used to drive the pressure pump to generate air pressure. The pressure adjustment knob is connected to the pressure pump and is used to set the air pressure of the pressure pump.

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