阅读说明：本技术 一种用于lng储罐蒸发率测试的在线监测系统 (A on-line monitoring system for LNG storage tank evaporation rate test ) 是由 张宝和 冯建周 李博成 李涛 马洪新 叶忠志 闫景鹏 苏娟 周福诞 丁杰 张昊 于 2020-04-09 设计创作，主要内容包括：本发明公开了一种用于LNG储罐蒸发率测试的在线监测系统,用于对所述LNG储罐的多个检测位置进行监测,其包括：数据采集单元、数据采集网关和控制终端,每个检测位置均设有多个间隔开设置的数据采集单元,以采集LNG储罐不同位置的数据信息,其中每个数据采集单元均设有安装在LNG储罐上的保护组件；数据采集网关与数据采集单元无线信号数据连接,并将接受到的数据信息以无线信号形式传输至控制终端,控制终端分析处理数据信息后输出处理信号,并由控制终端数显处理信号和数据信息。本发明的用于LNG储罐蒸发率测试的在线监测系统结构简单、安装方便,能有效提高测量精度和测量的安全系数。(The invention discloses an on-line monitoring system for testing the evaporation rate of an LNG storage tank, which is used for monitoring a plurality of detection positions of the LNG storage tank and comprises the following components: the system comprises a data acquisition unit, a data acquisition gateway and a control terminal, wherein each detection position is provided with a plurality of data acquisition units which are arranged at intervals so as to acquire data information of different positions of the LNG storage tank, and each data acquisition unit is provided with a protection component arranged on the LNG storage tank; the data acquisition gateway is in wireless signal data connection with the data acquisition unit and transmits received data information to the control terminal in a wireless signal form, the control terminal analyzes and processes the data information and then outputs a processed signal, and the signal and the data information are processed by digital display of the control terminal. The on-line monitoring system for the LNG storage tank evaporation rate test has the advantages of simple structure and convenience in installation, and can effectively improve the measurement precision and the measurement safety coefficient.)

1. An on-line monitoring system for boil-off testing of an LNG storage tank for monitoring a plurality of test locations of the LNG storage tank, comprising: the LNG storage tank detection system comprises a data acquisition unit, a data acquisition gateway and a control terminal, and is characterized in that each detection position is provided with a plurality of data acquisition units which are arranged at intervals so as to acquire data information of different positions of the LNG storage tank, wherein each data acquisition unit is provided with a protection component which is arranged on the LNG storage tank; the data acquisition gateway is in data connection with the data acquisition unit through wireless signals, the received data information is transmitted to the control terminal in a wireless signal mode, the control terminal analyzes and processes the data information and then outputs a processing signal, and the processing signal and the data information are digitally displayed by the control terminal.

2. The on-line monitoring system for the LNG storage tank evaporation rate test of claim 1, wherein the protection assembly comprises a heat collection block, a heat radiation prevention layer and a protection film layer, the data acquisition unit is packaged in the heat collection block, and the heat radiation prevention layer and the protection film layer are sequentially attached to the heat collection block from inside to outside.

3. The on-line monitoring system for the boil-off rate test of the LNG storage tank of claim 1, wherein the data acquisition unit is a temperature sensor.

4. The on-line monitoring system for the boil-off rate test of the LNG storage tank of claim 3, wherein the temperature sensor is a Pt100 thermal resistance temperature measuring element.

5. The on-line monitoring system for the LNG storage tank evaporation rate test of claim 1, wherein the control terminal comprises an upper computer and a cloud platform, the data acquisition gateway adopts a 4G communication protocol to transmit to the cloud platform, and the data acquisition gateway is connected with the upper computer through a data transmission interface.

6. The on-line monitoring system for the evaporation rate test of the LNG storage tank of claim 1, wherein the data acquisition unit is connected with the data acquisition gateway through a wireless LORA long-distance communication protocol.

7. The on-line monitoring system for the boil-off rate test of the LNG storage tank of claim 2, wherein the heat collection block is made of a stainless steel material containing molybdenum.

8. The on-line monitoring system for the LNG storage tank evaporation rate test of claim 2, wherein the thermal radiation prevention layer is an aluminum film, and the protection film layer is a tin foil.

9. The on-line monitoring system for the LNG storage tank evaporation rate test of claim 5, wherein the control terminal further comprises a mobile terminal, the mobile terminal is in data connection with the upper computer through Wifi or Bluetooth, and the mobile terminal is one of a mobile phone and a tablet.

10. The on-line monitoring system for the boil-off rate test of the LNG storage tank of claim 1, wherein the data information is temperatures of different detection positions of the LNG storage tank.

Technical Field

The invention relates to the technical field of petrochemical engineering, in particular to an online monitoring system for testing the evaporation rate of an LNG storage tank.

Background

The liquefied natural gas is stored in a normal-pressure low-temperature storage tank, and the temperature of liquid in the tank is lower than-160 ℃. The storage tank absorbs heat through the tank bottom, the tank wall and the dome, and low-temperature liquid in the tank is gasified by heating. The evaporation rate is a key parameter of the low-temperature liquid storage tank, and can be used for evaluating the design and construction quality of a cold insulation structure of the storage tank. Too high evaporation rate will cause the evaporation capacity too big, and the storage tank outer wall frosts, needs maintenance work such as pearlite secondary filling, leads to the increase of mill's liquefaction cost, and risk such as station shut down even. Therefore, the accurate measurement of the Boil Off Rate (BOR) of the LNG storage tank is of great significance.

In order to accurately measure the evaporation rate of the storage tank, necessary preparation work for the storage tank is first required. In order to enable the thermal field of the storage tank to reach a stable state, the evaporation rate test work is carried out after the storage tank precools the test run feed liquid for at least 4 weeks, and the test time is selected to be continuous on sunny days or cloudy days so as to eliminate the interference of non-intermittent solar radiation. Filling the liquid level of the storage tank to a height above 2/3, closing a valve of a pipeline for the storage tank to enter and exit, communicating with the outside only through a BOG pipeline, standing the storage tank for at least 4 days, and when the liquid level of the storage tank drops to a value lower than a design specified value every 8 hours, determining that the storage tank is qualified after standing.

And (4) marking temperature measuring points on the outer wall of the storage tank for temperature measurement. The principle of setting the temperature measuring points is as follows: the effectiveness of the temperature measuring points and the uniform distribution of the temperature measuring points are convenient to measure. The field marked temperature measurement points include: 4 outer walls of the storage tanks, 5 outer walls of the domes and 4 outer walls of the tank bottoms, and the total number of the temperature measuring points is 13. The traditional manual temperature measuring gun mode is adopted, and the measurement error is large under the influence of the operation method of a measuring person. Moreover, because the measurement period needs 24 hours for uninterrupted measurement, and the operation is related to the operation at the heights of the tank top, the bearing platform, the tank bottom and the like or the limited operation space, certain safety risk exists in the operation.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. In view of this, the present invention needs to provide an on-line monitoring system for testing the evaporation rate of an LNG storage tank, which has a simple structure and is convenient to install, and can effectively improve the measurement accuracy and the measurement safety factor.

The invention provides an on-line monitoring system for testing the evaporation rate of an LNG storage tank, which is used for monitoring a plurality of detection positions of the LNG storage tank and comprises: the LNG storage tank detection system comprises a data acquisition unit, a data acquisition gateway and a control terminal, and is characterized in that each detection position is provided with a plurality of data acquisition units which are arranged at intervals so as to acquire data information of different positions of the LNG storage tank, wherein each data acquisition unit is provided with a protection component which is arranged on the LNG storage tank; the data acquisition gateway is in data connection with the data acquisition unit through wireless signals, the received data information is transmitted to the control terminal in a wireless signal mode, the control terminal analyzes and processes the data information and then outputs a processing signal, and the processing signal and the data information are digitally displayed by the control terminal.

According to one embodiment of the invention, the protection component comprises a heat collection block, a heat radiation prevention layer and a protection film layer, the data acquisition unit is packaged in the heat collection block, and the heat radiation prevention layer and the protection film layer are sequentially attached to the heat collection block from inside to outside.

According to one embodiment of the invention, the data acquisition unit is a temperature sensor.

According to one embodiment of the invention, the temperature sensor is a Pt100 thermal resistance temperature sensing element.

According to one embodiment of the invention, the control terminal comprises an upper computer and a cloud platform, the data acquisition gateway is transmitted to the cloud platform by adopting a 4G communication protocol, and the data acquisition gateway is connected with the upper computer through a data transmission interface.

According to one embodiment of the invention, the data acquisition unit is connected with the data acquisition gateway through a wireless LORA long-range communication protocol.

According to one embodiment of the invention, said heat collector block is made of a stainless steel material containing molybdenum.

According to one embodiment of the invention, the heat-emitting radiation layer is an aluminum film and the protective film layer is a tin foil paper.

According to one embodiment of the invention, the control terminal further comprises a mobile terminal, the mobile terminal is in data connection with the upper computer through Wifi or Bluetooth, and the mobile terminal is one of a mobile phone and a tablet.

According to an embodiment of the present invention, the data information is temperatures of the LNG storage tank at different detection locations.

According to the on-line monitoring system for the LNG storage tank evaporation rate test, the temperatures of different positions of the LNG storage tank are collected through the temperature sensors arranged on a plurality of detection positions of the LNG storage tank, the temperature data information is finally transmitted to the cloud platform through the wireless LORA remote communication protocol and the 4G communication protocol, the temperature data information is processed through the upper computer to obtain the static evaporation rate (BOR), and the temperature data and the change of the static evaporation rate (BOR) information are clearly and intuitively displayed by adopting the data, curve, graph and table interaction mode.

Drawings

Fig. 1 is a schematic diagram of an on-line monitoring system for testing the evaporation rate of an LNG storage tank according to the present invention.

Fig. 2 is a schematic structural view of a temperature sensor and a protective assembly according to the present invention in cooperation.

Fig. 3 is a schematic structural diagram of a data acquisition gateway according to the present invention.

Reference numerals: 1-an LNG storage tank; 2-a temperature sensor; 3-a data acquisition gateway; 4-control the terminal; 5-a protective component; 31-an explosion-proof housing; a 32-LORA communications antenna; 33-4G communication antenna; 34-a data transmission interface; 41-an upper computer; 42-cloud platform; 51-heat collecting block; 52-a thermal radiation protection layer; 53-protective film layer.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 to 3, an on-line monitoring system for testing the evaporation rate of an LNG storage tank is used for monitoring a plurality of detection locations of the LNG storage tank 1, wherein the detection locations are distributed at three locations of a side outer wall, a top outer wall and a low outer wall of the LNG storage tank, and the on-line monitoring system comprises: the system comprises a data acquisition unit, a data acquisition gateway 3 and a control terminal 4, wherein a plurality of data acquisition units which are arranged at intervals are arranged at each detection position so as to acquire data information of different positions of an LNG (liquefied natural gas) storage tank 1, and it is understood that four temperature sensors 2 are arranged at intervals on the outer wall of the LNG storage tank side 1, five temperature sensors 2 which are arranged at intervals are distributed on the outer wall of the top, four temperature sensors 2 which are arranged at intervals are distributed on the outer wall of the low side, and each data acquisition unit is provided with a protection component 5 which is arranged on the LNG storage tank; the data acquisition gateway 3 is in wireless signal data connection with the data acquisition unit, and transmits the received data information to the control terminal 4 in a wireless signal form, the control terminal 4 outputs a processing signal after analyzing and processing the data information, and the control terminal 4 displays the processing signal and the data information, wherein the processing signal is the static evaporation rate (BOR) of the LNG storage tank 1, and the data information is the temperature of the detection position of the LNG storage tank 1.

According to the on-line monitoring system for the LNG storage tank evaporation rate test, the temperatures of different positions of the LNG storage tank 1 are collected through the temperature sensors 2 arranged on a plurality of detection positions of the LNG storage tank 1, the temperature data information is finally transmitted to the cloud platform 42 through the wireless LORA remote communication protocol and the 4G communication protocol, the temperature data information is processed through the upper computer 41 to obtain the static evaporation rate (BOR), and the temperature data and the change of the static evaporation rate (BOR) information are clearly and intuitively displayed by adopting a data, curve, graph and table interaction mode.

As shown in fig. 2, the protection device 5 includes a heat collection block 51, a thermal radiation protection layer 52 and a protection film layer 53, the data acquisition unit is packaged in the heat collection block 51, the thermal radiation protection layer 52 and the protection film layer 53 are sequentially attached to the heat collection block 51 from inside to outside, wherein the heat collection block 51 is made of a stainless steel material containing molybdenum, the thermal radiation protection layer 52 is an aluminum film, and the protection film layer 53 is a tin foil paper, it should be understood that the shape of the heat collection block 51 is suitable for the outer wall structure of the large LNG storage tank 1, the influence of solar radiation on the temperature detection result can be effectively reduced by arranging the aluminum film and the tin foil paper, and the measurement accuracy is improved.

As shown in fig. 1 and 2, the data acquisition unit is a temperature sensor 2, the temperature sensor 2 is a Pt100 thermal resistance temperature measurement element, the platinum sensor is a precision temperature measurement sensor, it can define the international temperature scale (ITS-90) in the temperature range of-190 ℃ to 660 ℃, the resistance temperature parameter has excellent stability and repeatability, the signal output size of the surface thermal resistance is 50-200 times of the thermocouple output.

As shown in fig. 1 and fig. 3, the control terminal 4 includes an upper computer 41 and a cloud platform 42, the data acquisition gateway 3 transmits to the cloud platform 42 by using a 4G communication protocol, the data acquisition gateway 3 is connected with the upper computer 41 through a data transmission interface 33 so as to perform processing such as data query and download on the upper computer 41 through the internet, the upper computer 41 calculates the static evaporation rate of the LNG storage tank 1 according to the temperature data acquired in real time, and changes of temperature and static evaporation rate (BOR) are clearly and intuitively displayed by using a data, curve, graph and table interaction mode, wherein the data acquisition gateway 3 uses an explosion-proof housing 31, and the explosion-proof housing 31 is provided with an LORA communication antenna 32, a 4G communication antenna 33 and a data transmission interface 34.

As shown in figure 1, the data acquisition unit is connected with the data acquisition gateway 3 through a wireless LORA remote communication protocol, and the LNG storage tank 1 to be detected can be far away from the control terminal 4 and the data acquisition gateway 3 through the use of the wireless LORA remote communication protocol.

As shown in fig. 1, the control terminal 4 further includes a mobile terminal, the mobile terminal is in data connection with the upper computer 41 through Wifi or bluetooth, wherein the mobile terminal is one of a mobile phone and a tablet, that is, the mobile terminal can check or download the measurement data and the measurement result in real time through the mobile phone or the tablet, that is, the temperatures of different detection positions of the LNG storage tank 1 and the static boil-off rate (BOR) in the storage tank.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.