Atmospheric pressure tank car volume measuring system

Abstract

The utility model discloses a normal pressure tank car volume measuring system, and belongs to the technical field of tank car volume measurement. Comprising a to-be-tested tank car body; the device further comprises a precision balance and a compressed carbon dioxide storage bottle; the compressed carbon dioxide bomb is placed on the precision balance; the compressed carbon dioxide storage bottle is communicated with the tank body of the tank car to be detected through a pipeline; at least one carbon dioxide concentration tester is mounted in the tank body of the tank car to be tested; a circulating fan is arranged in the tank body of the tank car to be detected; a gas outlet position is reserved at the top of the tank body of the tank car to be detected; the normal-pressure tank car volume measuring system can accurately and conveniently measure the volume of a normal-pressure tank car, can be widely applied to the related field of normal-pressure tank car volume detection, and has good practical value and application prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of atmospheric tank car volume measurement systems, belong to tank car volume measurement technical field. BACKGROUND

[0002] In many industrial fields and logistics transportation links, atmospheric tank car is widely used in the transportation of various liquid, gaseous substances;And accurately grasp the volume information of tank car tank is of vital importance to cargo measurement, safe transportation and related process control etc.

[0003] The commonly used method for atmospheric tank car volume verification at present has the following several kinds: (1) geometric measurement method, geometric measurement method obtains the accurate three-dimensional data of tank body by 3D scanner from multiple angles, calculates the volume of tank body according to the geometric volume calculation formula of corresponding regular shape, and determines the volume of tank car;But because the structure in tank car is relatively complex, the information obtained by scanner is reduced due to obstruction, resulting in large volume measurement error;(2) flow measurement method, which is to install flow meter on connecting pipeline when tank car is filled or unloaded, rely on the real-time measurement ability of flow meter to volume flow, combine filling and unloading time, according to the calculation method of V=Qt (V is volume, Q is average flow, t is time), determine the total volume of tank car content volume by integrating flow to time;This method is restricted by factors such as accuracy of flow meter, sealing property and stability of pipeline system, and is easy to have measurement error, so that the accuracy of final volume volume calculation is difficult to guarantee.

[0004] Traditional tank car volume measurement method often has problems such as insufficient precision, complex operation or limitation in specific environmental conditions;Especially, some measurement methods may have special requirements for tank car tank structure, resulting in limited applicability;Some measurement methods are difficult to ensure precision while considering the simplicity of operation, which is not conducive to on-site rapid detection etc. Therefore, in order to solve the above problems, it is urgent to propose an atmospheric tank car volume measurement system that can meet the diversified needs in practical application. UTILITY MODEL CONTENT

[0005] To solve the above problems, the utility model provides an atmospheric tank car volume measurement system, which can accurately and conveniently realize atmospheric tank car volume measurement, can be widely applied in atmospheric tank car volume detection related field, and has good practical value and application prospect.

[0006] The utility model discloses a normal pressure tank car volume measuring system, including the tank body of the tank car of measurement, still include precision balance and compressed carbon dioxide gas cylinder, utilize precision balance accurate measurement compressed carbon dioxide gas cylinder's mass change situation, and then realize the accurate calculation of gas injection amount, compressed carbon dioxide gas cylinder is placed on the precision balance, compressed carbon dioxide gas cylinder is linked with the tank body of measurement tank car through the pipeline, install at least one carbon dioxide concentration tester in the tank body of measurement tank car, utilize carbon dioxide concentration tester accurate record in the process of injecting carbon dioxide gas in the tank body of measurement tank car, the change situation of carbon dioxide concentration in the tank body of measurement tank car, the tank body of measurement tank car is filled with circulating fan, the top of the tank body of measurement tank car is reserved to have the gas level.

[0007] Further, the tank body of measurement tank car is also installed with thermometer and pressure sensor, and the change values of temperature and pressure in the tank body of measurement tank car at the end of measurement are accurately recorded by the thermometer and pressure sensor; the carbon dioxide concentration tester, thermometer and pressure sensor are respectively communicated with the digital display controller in a wireless mode.

[0008] Further, the compressed carbon dioxide gas cylinder is equipped with a pressure reducing valve.

[0009] Further, one end of the pipeline is connected with the compressed carbon dioxide gas cylinder, and the other end of the pipeline is connected to the bottom of the tank body of measurement tank car.

[0010] The measurement method of the normal pressure tank car volume measuring system comprises the following steps:

[0011] The measurement method comprises the following steps:

[0012] Firstly, the initial carbon dioxide concentration of the tank body of measurement tank car and the initial mass of the compressed carbon dioxide gas cylinder are recorded; the specific operation steps are as follows:

[0013] (1) when recording the initial carbon dioxide concentration of the tank body of measurement tank car: the initial carbon dioxide concentration in the tank body of measurement tank car is detected by using the carbon dioxide concentration tester, and the detected initial carbon dioxide concentration is recorded as ρ1; the sampling point of the tester is set as follows: one sampling point is set for the tank body with a volume less than 25m 3 ; two sampling points are set for the tank body with a volume between 25m 3 and 50m 3 ; and three sampling points are set for the tank body with a volume between 50m 3 and 100m 3The tank body of the tank truck is provided with three sampling points;

[0014] (2) When recording the initial mass of the compressed carbon dioxide gas cylinder, the compressed carbon dioxide gas cylinder, pressure reducing valve and pipeline are placed on the precision balance together, and the reading of the precision balance at this time is recorded as m1;

[0015] Secondly, a certain amount of carbon dioxide gas is injected into the tank body of the tank truck to be measured, and after the injection is completed, the gas outlet is sealed, the circulating fan is used to make the gas in the tank body reach a uniform balanced state, and the balanced temperature, balanced carbon dioxide concentration in the tank body of the tank truck and the final mass of the compressed carbon dioxide gas cylinder are recorded; the specific operation steps are as follows:

[0016] The pipeline is connected with the tank body of the tank truck to be measured, the carbon dioxide gas is slowly introduced into the tank body of the tank truck to be measured from the bottom through the compressed carbon dioxide gas cylinder, the air of the same volume is discharged from the gas outlet at the upper part of the tank body, and the pressure in the tank body is maintained as normal pressure in the whole process; when the gas in the tank body reaches the corresponding state, the reading of the precision balance at this time is recorded as m2, and the reading of the thermometer at this time, the reading of the pressure sensor and the carbon dioxide concentration ρ2 in the tank body of the tank truck to be measured are recorded, and the following formula is obtained:

[0017] V(ρ2-ρ1)=(m2-m1)RT / (44*P),

[0018] In the formula, V is the volume of the tank body of the tank truck (unit m 3 ); ρ2 is the carbon dioxide concentration at the time of balance (unit ppm); ρ1 is the carbon dioxide concentration at the initial time (unit ppm); m2 is the mass of the compressed carbon dioxide gas cylinder at the time of balance (unit g); m1 is the mass of the compressed carbon dioxide gas cylinder at the initial time (unit g); R is the ideal gas constant (unit J / (mol·K)); T is the temperature in the tank body of the tank truck at the time of balance (unit K); and P is the pressure in the tank body of the tank truck at the time of balance (unit Pa).

[0019] Thirdly, based on the measured data, the volume of the tank body of the tank truck to be measured is calculated according to the above formula, and the calculation of the volume of the tank body of the tank truck to be measured is completed.

[0020] Compared with the prior art, the normal pressure tank truck volume measuring system has the advantages of simple structure, convenient measurement, high measurement precision, saving of traditional large facilities such as water tank and water pump, effective reduction of measurement cost, wide application range, no limitation of the shape and internal structure complexity of the tank body, applicability to tank trucks with different internal structures, and accurate, convenient and reliable volume measurement. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic view of embodiment 1 of the utility model.

[0022] The components in the drawings are marked as: 1-precision balance, 2-compressed carbon dioxide gas cylinder, 3-carbon dioxide concentration tester, 4-thermometer, 5-pressure sensor, 6-pipeline, 7-tank body of tank truck to be measured, 8-gas outlet position, 9-circulating fan. DETAILED DESCRIPTION

[0023] The atmospheric pressure tank truck volume measuring system of the utility model, including tank body 7 of tank truck to be measured, still including precision balance 1 and compressed carbon dioxide gas cylinder 2, utilize precision balance 1 to accurately measure the mass change condition of compressed carbon dioxide gas cylinder 2, and then realize the accurate calculation of gas injection amount, compressed carbon dioxide gas cylinder 2 is placed on precision balance 1, compressed carbon dioxide gas cylinder 2 is connected with tank body 7 of tank truck to be measured through pipeline 6, tank body 7 of tank truck to be measured is equipped with at least one carbon dioxide concentration tester 3, and the change condition of carbon dioxide concentration in tank body 7 of tank truck to be measured is accurately recorded in the process of injecting carbon dioxide gas into tank body 7 of tank truck to be measured using carbon dioxide concentration tester 3, circulating fan 9 is loaded in tank body 7 of tank truck to be measured, and gas outlet position 8 is reserved at the top of tank body 7 of tank truck to be measured.

[0024] Among them, thermometer 4 and pressure sensor 5 are also installed in tank body 7 of tank truck to be measured, and the change values of temperature and pressure in tank body 7 of tank truck to be measured at the end of measurement are accurately recorded by thermometer 4 and pressure sensor 5 respectively, carbon dioxide concentration tester 3, thermometer 4 and pressure sensor 5 are respectively connected with digital display controller in a wireless mode, wherein digital display controller can display the carbon dioxide concentration, temperature and pressure values detected by carbon dioxide concentration tester 3, thermometer 4 and pressure sensor 5 in real time, which is the instrument and equipment commonly used in the prior art for communicating with sensors and realizing sensor detection value display, and the specific structure and working principle thereof will not be described in detail here, compressed carbon dioxide gas cylinder 2 is equipped with a pressure reducing valve, one end of pipeline 6 is connected with compressed carbon dioxide gas cylinder 2, and the other end of pipeline 6 is connected to the bottom of tank body 7 of tank truck to be measured.

[0025] The measurement method of the atmospheric pressure tank truck volume measuring system of the utility model first reserves a gas outlet position 8 at the upper part of tank body 7 of tank truck to be measured to ensure that the gas can circulate normally, and then according to the size of tank body 7 of tank truck to be measured, the corresponding number of carbon dioxide concentration testers 3 are placed at appropriate positions in tank body 7 of tank truck to be measured, and the number and specific positions of each tester are determined,

[0026] The measurement method comprises the following steps:

[0027] Firstly, the initial carbon dioxide concentration of tank body 7 of tank truck to be measured and the initial mass of compressed carbon dioxide gas cylinder 2 are recorded, and the specific operation steps are as follows:

[0028] (1) Record the initial carbon dioxide concentration of the tank truck tank 7 to be measured: use the carbon dioxide concentration tester 3 to detect the initial carbon dioxide concentration inside the tank truck tank 7 to be measured, and the measured initial carbon dioxide concentration is recorded as ρ1. The sampling point setting rule of the tester is: one sampling point is set for a tank with a volume less than 25m 3 ; two sampling points are set for a tank with a volume between 25m 3 and 50m 3 ; and three sampling points are set for a tank with a volume between 50m 3 and 100m 3 .

[0029] (2) Record the initial mass of the compressed carbon dioxide gas cylinder 2: place the compressed carbon dioxide gas cylinder 2, the pressure reducing valve, and the pipeline 6 together on the precision balance 1, and record the reading of the precision balance 1 at this time as m1.

[0030] Second step, inject a certain amount of carbon dioxide gas into the tank truck tank 7 to be measured, seal the gas outlet after the injection is completed, and use the circulating fan 9 to promote the gas in the tank to reach a uniform balanced state, while recording the balanced temperature, balanced carbon dioxide concentration in the tank truck tank, and the final mass of the compressed carbon dioxide gas cylinder; the specific operation steps are as follows:

[0031] Connect the pipeline 6 with the tank truck tank 7 to be measured, slowly pass the carbon dioxide gas from the bottom of the tank truck tank 7 to be measured through the compressed carbon dioxide gas cylinder 2, so that the upper part of the tank truck tank 7 discharges an equal volume of air, and maintain a constant pressure state in the tank during this process. When the gas in the tank reaches the corresponding state, record the reading of the precision balance at this time as m2, and record the reading of the thermometer 4 at this time in the tank truck tank 7 to be measured T, the reading of the pressure sensor 5 P, and the carbon dioxide concentration ρ2, and then derive the following formula:

[0032] V(ρ2-ρ1)=(m2-m1)RT / (44*P),

[0033] wherein V is the volume of the tank truck tank (unit m 3 ); ρ2 is the balanced carbon dioxide concentration (unit ppm); ρ1 is the initial carbon dioxide concentration (unit ppm); m2 is the mass of the compressed carbon dioxide gas cylinder at equilibrium (unit g); m1 is the mass of the compressed carbon dioxide gas cylinder at the initial stage (unit g); R is the ideal gas constant (unit J / (mol·K)); T is the temperature in the tank truck tank at equilibrium (unit K); and P is the pressure in the tank truck tank at equilibrium (unit Pa).

[0034] Thirdly, based on the measured data, the volume of the tank car is calculated according to the above formula, and the calculation of the volume of the tank car is completed.

[0035] Embodiment 1

[0036] As Figure 1 shown, the measured volume of the tank car is between 25m 3 and 50m 3 , so two sampling points are set, and the average of the measured initial carbon dioxide concentration is 1238ppm.

[0037] During the measurement, the compressed carbon dioxide cylinder 2, the pressure reducing valve and the pipeline 6 are placed on the precision balance 1 together, and the reading of the precision balance 1 at this time is recorded as 18494.9g; then, the pipeline 6 is connected with the tank car 7 to be measured, and carbon dioxide gas is slowly introduced from the bottom of the tank car 7 to be measured through the compressed carbon dioxide cylinder 2, so that the upper gas outlet 8 of the tank car 7 to be measured discharges an equal volume of air, and the pressure inside the tank car is maintained at a constant pressure during the process; when the gas in the tank car reaches the corresponding state, the reading of the precision balance at this time is recorded as 17738.9g, and the reading of the thermometer 4 in the tank car 7 to be measured is recorded as 287.15K, the reading of the pressure sensor 5 is recorded as 101325Pa, and the average concentration of carbon dioxide is recorded as 20021.33ppm, and the following formula is obtained:

[0038] V*(20021.33-1238)*10 -6 =(18494.9-17738.9)*8.314*287.15 / (44*101325);

[0039] Finally, according to the above formula, the volume of the tank car 7 to be measured is calculated as 21.553m 3 , and the actual value is 21.667m 3 .

[0040] The atmospheric pressure tank car volume measuring system has the advantages that the structure is simple, the measurement is simple and convenient, only the carbon dioxide concentration, temperature, pressure of the tank body of the tank car to be measured and the mass of the compressed carbon dioxide gas cylinder need to be collected, the measurement is simple and fast, the applicable medium is compressed air or carbon dioxide, the cost is low, the traditional pool, water pump and other large facilities are saved, the measurement precision of the measuring system is relatively high, the gas injection amount is calculated by accurately measuring the mass change of the compressed carbon dioxide gas cylinder through the precision balance, reliable basis is provided for volume calculation in combination with the ideal gas state equation and the accurately measured data, compared with the traditional measurement method, the volume measurement precision is remarkably improved, the application range of the measuring system is wide, is not limited by the tank body shape and the internal structure complexity of the tank car, the measuring system and method of the present application are applicable to tank cars with different internal structures, and the problems that the geometric measurement method has large measurement error for the tank body with complex structure and some methods have special requirements for the tank body shape are solved.

[0041] The above embodiments are only preferred embodiments of the present application, so equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. A normal pressure tank car volume measurement system, comprising a tank car tank to be measured; characterized in that: Also include precision balance and compressed carbon dioxide gas cylinder; the compressed carbon dioxide gas cylinder is placed on the precision balance; the compressed carbon dioxide gas cylinder is connected with the tank truck tank to be measured through pipeline; at least one carbon dioxide concentration tester is installed in the tank truck tank to be measured; the tank truck tank to be measured is loaded with circulating fan; the top of the tank truck tank to be measured is reserved with gas outlet position.

2. The atmospheric tank car gauging system of claim 1, wherein: The tank truck tank to be measured is also installed with thermometer and pressure sensor; the carbon dioxide concentration tester, thermometer and pressure sensor are respectively communicated with digital display controller through wireless mode.

3. The atmospheric tank car gauging system of claim 1, wherein: The compressed carbon dioxide gas cylinder is equipped with pressure reducing valve.

4. The atmospheric tank car gauging system of claim 1, wherein: One end of the pipeline is connected with the compressed carbon dioxide gas cylinder, and the other end of the pipeline is connected to the bottom of the tank truck tank to be measured.

Images