WO2021258550A1

WO2021258550A1 - Automatic pressure control type internal pressure creep blasting test device and method

Info

Publication number: WO2021258550A1
Application number: PCT/CN2020/113957
Authority: WO
Inventors: 李江; 唐丽英; 周荣灿; 詹英杰; 龚兵; 王庆武; 徐安; 李季; 王博涵; 侯淑芳; 宁娜
Original assignee: 西安热工研究院有限公司
Priority date: 2020-06-23
Filing date: 2020-09-08
Publication date: 2021-12-30
Also published as: CN111678800A

Abstract

An automatic pressure control type internal pressure creep blasting test device and method. The test device comprises a circulation loop system, a heating system and an automatic pressure control system. The device uses a control computer (22) to control an ultrahigh pressure air pump (4), an electric control air inlet needle valve (8) and an electric control back pressure valve (14) to achieve automatic pressure control and pressure supplementing, such that the pressure control precision is high, the accuracy and stability of the pressure in a sample (20) are guaranteed, the pressure range is between 0 and 100 MPa, the temperature can be controlled between room temperature and 1000°C by means of a heating electric furnace (18), and different test condition requirements can be met. The device further has an automatic overtemperature and overpressure protection function and a power-off protection function, thereby ensuring long-term stability and reliability of an apparatus, such that a high-temperature internal pressure creep blasting test in an automatic pressure control state can be achieved.

Description

Automatic pressure control type internal pressure creep blasting test device and method

【Technical Field】

The invention belongs to the technical field of high-temperature creep test research of metallic materials, and specifically relates to an automatic pressure-controlled internal pressure creep blasting test device and method.

【Background technique】

The high-temperature creep endurance performance provides an important basis for the design, material selection and service life evaluation of high-temperature components. At present, the conventional high-temperature creep endurance strength test uses standard specimens for high-temperature uniaxial tensile creep or endurance tests. In actual working conditions, pressure-bearing metal pipes are subjected to two-dimensional stress in the hoop and axial directions in a high-temperature environment. The traditional There is a big gap between the uniaxial tensile test results and the actual working conditions. For this reason, domestic and foreign experts have proposed internal pressure creep test methods, and have formed relevant test standards (DL/T 369-2010 power station boiler tube internal pressure creep test method). The size of the internal pressure in the internal pressure creep test directly determines the size of the stress on the sample, and its accuracy and stability often have a significant impact on the test results. Patent CN200920274875.5 discloses a metal pipe internal pressure creep test device. CN201820275843.6 also discloses an internal pressure creep test device that simulates the service environment of coal-fired power plant boiler tubes. However, the current test device usually adopts a method of manually observing the pressure drop value and periodically manually supplementing the pressure. This method will not only consume a lot of Manpower and high technical requirements for operators, otherwise it is likely to cause overpressure in the sample tube due to the hysteresis of the pressure rise, and it is difficult to ensure the stability of the test pressure. Therefore, there is an urgent need to develop a set of high-temperature internal pressure creep blasting test equipment that can realize automatic pressure compensation and pressure control.

[Summary of the invention]

The purpose of the present invention is to solve the above-mentioned problems in the prior art and provide an automatic pressure-controlled internal pressure creep blasting test device and method.

In order to achieve the above objectives, the present invention adopts the following technical solutions to achieve:

An automatic pressure-controlled internal pressure creep blasting test device, which is characterized in that it comprises a circulation loop system, a heating system and an automatic pressure control system; wherein the circulation loop system includes an air source connected in sequence by a pipeline, a manual needle valve, Filter, ultra high pressure air pump, voltage stabilizer, high pressure burst valve A, high pressure check valve A, electronically controlled intake needle valve, buffer tank, pressure measuring point, high pressure check valve B, high pressure burst valve B, spiral coil pipe , Electronically controlled back pressure valve, low pressure check valve and exhaust gas recovery device; heating system includes preheater, heating electric furnace, furnace tube and tubular sample; the tubular sample is placed in the furnace tube in the heating electric furnace, and the sample inlet end It is connected to the low-temperature intake pipeline through a preheater; the pressure automatic control system includes a pressure control cabinet and its control computer, wherein the pressure control cabinet is connected to an ultra-high pressure air pump, an electronic control intake needle valve, a pressure measurement point and an electronic control back through a signal wire For the pressure valve, during the test, the control computer achieves the goal of automatic pressure control by controlling the start-stop state of the above-mentioned components and the opening of the valve.

A further improvement of the present invention is that the ultra-high pressure air pump is a high-lift low-flow air pump, and the time required to open the high-pressure air pump with the minimum flow of the air pump to pressurize the circuit to the target pressure P ₀ should be ≥ 20 minutes.

A further improvement of the present invention is that the buffer tank is arranged in the high-pressure and low-temperature section, and its volume is ≥4 times the volume of the high-pressure pipeline, which is used to slow down pressure fluctuations.

The further improvement of the present invention is that the pressure control accuracy of the whole set of equipment is within ±1%, and it is also provided with over-temperature, over-pressure automatic protection functions, and power-off protection functions.

A further improvement of the present invention is that a vacuum branch is provided between the low pressure check valve and the electronically controlled back pressure valve, and the vacuum branch is provided with a vacuum pump needle valve and a vacuum pump.

The further improvement of the present invention is that a certain length of spiral coil is provided in front of the electronic control back pressure valve, which is used for the working fluid in the air cooling pipe to ensure that the working fluid has been cooled down to the application of the electronic control back pressure valve before entering the electronic control back pressure valve. Within the temperature range.

A further improvement of the present invention is that the target test pressure value P ₀ has upper and lower limits, which are respectively P ₂ and P _{1. The} principle of automatic pressure control during the normal test phase of the entire set of equipment is that when the pressure P at the pressure measurement point is slightly lower than the lower limit When the value is P ₁ , control the computer to open the ultra-high pressure air pump and the electronically controlled intake needle valve, and pump air into the circuit until P = P ₀ , close the ultra-high pressure air pump and the electronically controlled intake needle valve, and the newly injected gas will be in high temperature thermal expansion circuit section, resulting in a slight increase in P, when the upper limit value P ₂ P>, the control computer adjusting the opening degree of the electrically controlled back pressure valve, the gas release portion, to ensure that P ₀ <P <P _2.

A method for using an automatic pressure-controlled internal pressure creep blasting test device, which is based on the above-mentioned automatic pressure-controlled internal pressure creep blasting test device, and includes the following steps:

The first step is to vacuum the entire circulation loop, open the electronically controlled intake needle valve, the electronically controlled back pressure valve, the vacuum pump needle valve and the vacuum pump in sequence to vacuum the system, and close the above valves after vacuuming;

In the second step, the heating system is used to raise the temperature of the tubular sample to the target test temperature;

The third step is to pressurize the system, manually open the manual needle valve, and electrically open the ultra-high pressure air pump and the electronically controlled intake needle valve. At this time, the electronically controlled back pressure valve is in the closed state, and then add test gas to the loop until P= At P ₀ , close the ultra-high pressure air pump and the electronically controlled intake needle valve. After the test gas flows into the high temperature zone of the test circuit, the volume will expand due to the increase in temperature, resulting in a slight increase in P. When P>P ₂ , then Control the computer to adjust the opening of the electronically controlled back pressure valve, release some gas, and ensure that P ₀ ＜P＜P ₂ ;

The fourth step is the normal test stage. After completing the above heating and pressurizing steps, the system will enter the long-term normal test stage. In this stage, the system will monitor and record the temperature and pressure in real time. When P is lower than the lower limit of the test pressure P ₁ , the system will complete automatic pressure compensation;

The fifth step is to stop after the blasting. When the tube sample is blasted, the pressure P at the pressure measuring point will suddenly drop to a lower level. At this time, the control computer will automatically recognize the end of the test, and perform temperature reduction and pressure relief operations.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention uses a computer-controlled ultra-high pressure air pump, an electronically controlled intake needle valve, and an electronically controlled back pressure valve to achieve automatic pressure control. The pressure control accuracy is high, and the accuracy and stability of the pressure in the sample are ensured, so that the temperature is high. The results of the compressive creep test are more accurate and reliable.

2. The present invention is equipped with automatic pressure compensation and blasting recognition functions, which can realize automatic pressure compensation during the long-term high-temperature internal pressure creep test process. At the same time, the pressure and temperature are automatically relieved after the sample is blasted, which greatly saves labor costs and guarantees the test Reliable for a long time.

3. In the present invention, a large-volume buffer tank is installed in the high-pressure and low-temperature section of the pipeline, which can effectively slow down the pressure fluctuation of the entire system and ensure the stability of the pressure.

4. The device of the present invention can adjust the internal pressure of the sample to be between 0 and 100 MPa through the ultra-high pressure air pump, electronically controlled intake needle valve, and electronically controlled back pressure valve, and the temperature can be controlled by the heating furnace between room temperature and 1000 ℃ , Can meet the requirements of different test conditions.

【Explanation of the drawings】

Figure 1 is a schematic diagram of the overall structure of the test device of the present invention.

Among them, 1- air source; 2- manual needle valve; 3- filter; 4- ultra-high pressure air pump; 5- voltage stabilizer; 6-high pressure burst valve A; 7- high pressure check valve A; 8- electric control inlet Gas needle valve; 9-buffer tank; 10-pressure measuring point; 11-high pressure check valve B; 12-high pressure burst valve B; 13-spiral coil; 14-electrically controlled back pressure valve; 15-low pressure check valve 16-Exhaust gas recovery device; 17-preheater; 18-heating electric furnace; 19-furnace tube; 20-tubular sample; 21-pressure control cabinet; 22-control computer; 23-vacuum pump needle valve; 24-vacuum pump;

【detailed description】

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are a part of the present invention, not all the embodiments, and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The drawings show various structural schematic diagrams according to the disclosed embodiments of the present invention. These figures are not drawn to scale, some details are enlarged and some details may be omitted for clarity of presentation. The shapes of the various regions and layers shown in the figure and the relative size and positional relationship between them are only exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations. Areas/layers with different shapes, sizes, and relative positions can be designed as needed.

In the context of the present disclosure, when a layer/element is referred to as being “on” another layer/element, the layer/element may be directly on the other layer/element, or there may be an intermediate layer/element between them. element. In addition, if a layer/element is located "on" another layer/element in one orientation, the layer/element may be located "under" the other layer/element when the orientation is reversed.

It should be noted that the terms “first” and “second” in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

The present invention will be further described in detail below in conjunction with the accompanying drawings:

As shown in Figure 1, an automatic pressure-controlled internal pressure creep blasting test device provided by the present invention includes three parts: a circulation loop system, a test heating system and a pressure control system.

Among them, the circulation loop system includes air source 1, manual needle valve 2, filter 3, ultra-high pressure air pump 4, voltage stabilizer 5, high-pressure blasting valve A6, high-pressure check valve A7, and electronically controlled air intake connected in sequence by pipelines. Needle valve 8, buffer tank 9, pressure measuring point 10, high pressure check valve B11, high pressure burst valve B12, spiral coil 13, electronically controlled back pressure valve 14, low pressure check valve 17, and exhaust gas recovery device 16; heating system includes The preheater 17, the heating electric furnace 18, the furnace tube 19 and the tubular sample 20; the tubular sample 20 is placed in the furnace tube 19 in the heating electric furnace 18, the sample entrance end is provided with a preheater 17, and the sample entrance end passes The preheater 17 is connected to the low-temperature intake pipeline; the pressure automatic control system includes a pressure control cabinet 21 and its control computer 22, wherein the pressure control cabinet 21 is connected to the ultra-high pressure air pump 4, the electronically controlled intake needle valve 8, and the pressure measurement through a signal wire Point 10 and the electronically controlled back pressure valve 14. During the test, the control computer 22 achieves the goal of automatic pressure control by controlling the start-stop state of the above-mentioned components and the opening of the valve.

In addition, a vacuuming branch is provided between the electronically controlled back pressure valve 14 and the low-pressure check valve 15, and a vacuum pump needle valve 23 and a vacuum pump 24 are provided on the vacuuming branch. A certain length of spiral coil 13 is installed in front of the electronic control back pressure valve 14, which is used for the working fluid in the air cooling pipe to ensure that the working fluid has been cooled to within the applicable temperature range of the electronic control back pressure valve 13 before entering the electronic control back pressure valve 14 .

The target test pressure value P ₀ has upper and lower limits, which are P ₂ and P _{1 respectively} . The principle of automatic pressure control during the normal test phase of the whole set of equipment is that when the pressure P at the pressure measuring point 10 is slightly lower than the lower limit P ₁ , then The control computer 22 opens the ultra-high pressure air pump 4 and the electronically controlled intake needle valve 8, and pumps air into the circuit until P = P ₀ , closes the ultra-high pressure air pump 4 and the electronically controlled intake needle valve 8 and the newly injected gas is at a high temperature in the circuit heat expansion section will be, resulting in a slight increase in P, when P> P _2, then the computer 22 controls the back pressure regulator electrically controlled valve opening 14, the gas release portion, to ensure that P ₀ <P <P _2.

The ultra-high pressure air pump 4 is a high-lift and low-flow air pump. The time required to open the high-pressure air pump 4 to pressurize the circuit to the target pressure P ₀ with the minimum flow of the air pump should be ≥ 20 minutes. The buffer tank 9 is arranged in the high-pressure and low-temperature section, and its volume is more than 4 times the volume of the high-pressure pipeline, and is used to reduce pressure fluctuations.

The pressure control accuracy of the whole set of equipment is within ±1%, and it is also equipped with over-temperature, over-pressure automatic protection functions, and power-off protection functions.

The target test pressure value P ₀ has upper and lower limits, which are P ₂ and P _{1 respectively} . The principle of automatic pressure control during the normal test phase of the whole set of equipment is that when the pressure P at the pressure measuring point 10 is slightly lower than the lower limit P ₁ , then The control computer 22 opens the ultra-high pressure air pump 4 and the electronically controlled intake needle valve 8, and pumps air into the circuit until P = P ₀ , closes the ultra-high pressure air pump 4 and the electronically controlled intake needle valve 8, and the newly injected gas will be in the circuit thermal expansion of the high temperature section, resulting in a slight increase in P, when the upper limit value P ₂ P>, the computer 22 controls the opening degree of the electronically controlled the back pressure regulator valve 14, the gas release portion, to ensure that P ₀ <P <P _2.

The method for using an automatic pressure-controlled internal pressure creep blasting test device provided by the present invention includes the following steps:

The first step is to vacuum the entire circulation loop, open the electronically controlled intake needle valve 8, the electronically controlled back pressure valve 14, the vacuum pump needle valve 23, and the vacuum pump 24 in sequence to vacuum the system. After vacuuming, close the above valves ；

The second step is to heat up the tubular sample 20 to the target test temperature through the heating system;

The third step is to pressurize the system, manually open the manual needle valve 2, and electrically open the ultra-high pressure air pump 4 and the electronic control intake needle valve 8. At this time, the electronic control back pressure valve 14 is in the closed state, and then the test gas is added to the circuit , Until P = P ₀ , close the ultra-high pressure air pump 4 and the electronically controlled intake needle valve 8. After the test gas flows into the high temperature zone of the test circuit, the volume will expand due to the increase in temperature, which will cause P to increase slightly. > P ₂ , then control the computer 22 to adjust the opening of the electronically controlled back pressure valve 14 to release part of the gas to ensure that P ₀ ＜P＜P ₂ ;

The fifth step is to stop after blasting. When the tubular sample 20 is blasted, the pressure P at the pressure measuring point will suddenly drop to a lower level. At this time, the control computer 22 will automatically recognize the end of the test, and perform the temperature reduction and pressure relief operations.

The above content is only to illustrate the technical ideas of the present invention, and cannot be used to limit the scope of protection of the present invention. Any changes made on the basis of the technical solutions based on the technical ideas proposed by the present invention fall into the claims of the present invention. Within the scope of protection.

Claims

An automatic pressure control type internal pressure creep blasting test device, which is characterized in that it comprises a circulating loop system, a heating system and an automatic pressure control system; wherein,

The circulation loop system includes the air source (1), manual needle valve (2), filter (3), ultra-high pressure air pump (4), voltage stabilizer (5), high pressure blasting valve A (6) connected in sequence by pipelines , High pressure check valve A (7), electronically controlled intake needle valve (8), buffer tank (9), pressure measuring point (10), high pressure check valve B (11), high pressure burst valve B (12), Spiral coil (13), electronically controlled back pressure valve (14), low pressure check valve (15) and tail gas recovery device (16);

The heating system includes a preheater (17), a heating electric furnace (18), a furnace tube (19) and a tubular sample (20); the tubular sample (20) is placed in the furnace tube (19) in the heating electric furnace (18) Inside, the inlet end of the sample is connected to the low-temperature air inlet pipe through a preheater (17);

The pressure automatic control system includes a pressure control cabinet (21) and its control computer (22), in which the pressure control cabinet (22) is connected to the ultra-high pressure air pump (4), electronically controlled intake needle valve (8), and pressure measuring points through signal wires (10) and the electronically controlled back pressure valve (14). During the test, the control computer (22) achieves the goal of automatic pressure control by controlling the start-stop state of the above-mentioned components and the opening of the valve.
The automatic pressure-controlled internal pressure creep blasting test device according to claim 1, wherein the ultra-high pressure air pump (4) is a high-lift low-flow air pump, and the air pump for opening the high-pressure air pump (4) The time required for the minimum flow to pressurize the circuit to the target pressure P 0 should be ≥20 minutes.
The automatic pressure-controlled internal pressure creep blasting test device according to claim 1, wherein the buffer tank (9) is set in the high-pressure and low-temperature section, and its volume is ≥4 times the volume of the high-pressure pipeline. Reduce pressure fluctuations.
The automatic pressure control type internal pressure creep blasting test device according to claim 1, characterized in that the pressure control accuracy of the whole set of equipment is within ±1%, and it is also provided with over-temperature and over-pressure automatic protection functions. Protective function.
An automatic pressure-controlled internal pressure creep blasting test device according to claim 1, characterized in that a vacuum branch circuit is provided between the low-pressure one-way valve (15) and the electronic control back pressure valve (14) A vacuum pump needle valve (23) and a vacuum pump (24) are arranged on the vacuum branch circuit.
The automatic pressure-controlled internal pressure creep blasting test device according to claim 1, characterized in that a certain length of spiral coil (13) is provided in front of the electronically controlled back pressure valve (14), which is used in the air-cooled pipe The working fluid ensures that the working fluid has been cooled to within the applicable temperature range of the electronic control back pressure valve (13) before entering the electronic control back pressure valve (14).
The automatic pressure control type internal pressure creep blasting test device according to claim 1, wherein the target test pressure value P 0 has upper and lower limits, which are P 2 and P 1 respectively , and the whole set of equipment is in the normal test stage The principle of automatic pressure control is that when the pressure P at the pressure measuring point (10) is slightly lower than the lower limit value P 1 , the control computer (22) opens the ultra-high pressure air pump (4) and the electronically controlled intake needle valve (8), Inject air into the loop until P=P 0 , close the ultra-high pressure air pump (4) and the electronically controlled intake needle valve (8), the newly injected gas will be heated and expand in the high temperature section of the loop, causing P to increase slightly. upper limit value P 2 P>, the control computer (22) a back pressure regulator electrically controlled valve (14) opening degree, the gas release portion, to ensure that P 0 <P <P 2.
A method for using an automatic pressure-controlled internal pressure creep blasting test device, characterized in that the method of use is based on the automatic pressure-controlled internal pressure creep blasting test device of claims 1 to 7, comprising the following steps :

The first step is to vacuum the entire circulation loop, open the electronically controlled intake needle valve (8), electronically controlled back pressure valve (14), vacuum pump needle valve (23) and vacuum pump (24) in sequence to vacuum the system , After vacuuming, close the above valve;

In the second step, the heating system is used to heat up the tubular sample (20) to the target test temperature;

In the third step, the system is pressurized, the manual needle valve (2) is manually opened, the ultra-high pressure air pump (4) and the electronic control intake needle valve (8) are electrically opened, and the electronic control back pressure valve (14) is in the closed state. Then add the test gas to the circuit until P=P 0 , close the ultra-high pressure air pump (4) and the electronically controlled intake needle valve (8). After the test gas flows into the high temperature area of the test circuit, it will be caused by the increase in temperature. The volume expansion causes P to increase slightly. When P>P 2 , the computer (22) will be controlled to adjust the opening of the electronically controlled back pressure valve (14) to release some gas to ensure that P 0 <P<P 2 ;

The fourth step is the normal test stage. After completing the above heating and pressurizing steps, the system will enter the long-term normal test stage. In this stage, the system will monitor and record the temperature and pressure in real time. When P is lower than the lower limit of the test pressure P 1 , the system will complete automatic pressure compensation;

The fifth step is to stop after the blasting. When the tube sample (20) is blasted, the pressure P at the pressure measuring point will suddenly drop to a lower level. At this time, the control computer (22) will automatically recognize the end of the test, and perform cooling and unloading.压 Operation.