Pressure measuring device for oxygen bomb type calorimeter

Abstract

A pressure measuring device for an oxygen bomb type calorimeter relates to the field of combustion heat detection equipment and comprises a sleeve seat and a plug rod, the plug rod is matched with the sleeve seat for use, a sleeve seat upper hole is formed in the sleeve seat, a sleeve seat lower hole is formed in the lower portion of the sleeve seat, a sleeve seat side hole is formed in the side face of the sleeve seat, an external thread is arranged on the plug rod, and the sleeve seat upper hole and the sleeve seat lower hole are matched for use. A sealing groove is formed in the plug rod, and a rod needle is arranged at the lower end of the plug rod. The pressure measuring device can solve the problem that a pressure measuring device matched with an oxygen bomb calorimeter does not exist at present in the background technology.

Description

Technical Field

[0001] This utility model belongs to the field of combustion heat detection equipment, and in particular a pressure measuring device for an oxygen bomb calorimeter. Background Technology

[0002] Oxygen bomb calorimetry is currently the main technology for testing the heat of combustion, and its core equipment is the oxygen bomb calorimeter. The analyte is placed in the oxygen bomb calorimeter and ignited by high-pressure oxygen. The heat released during combustion is absorbed by a calorimetric system (such as a water bath), and the heat of combustion is calculated by measuring the temperature change. Previously, the pressure change before and after the combustion reaction could only be calculated using the combustion equation of the analyte and the ideal gas approximation. However, the difference between ideal and real gases leads to errors between this theoretical approximation and the actual value. More importantly, pressure change values ​​cannot be obtained for analytes with unknown components or mixed samples, which is a major challenge for calculating isobaric combustion. Currently, there is no pressure measurement device designed specifically for the oxygen bomb calorimeter. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a pressure measuring device for an oxygen bomb calorimeter.

[0004] A pressure measuring device for an oxygen bomb calorimeter includes: a sleeve and a plug rod, the plug rod being used in conjunction with the sleeve, the sleeve having an upper hole, a lower hole, and a side hole, the plug rod having an external thread, a sealing groove, and a rod needle at its lower end.

[0005] The upper hole and the lower hole of the sleeve are coaxially arranged, and the upper hole, the lower hole and the side hole of the sleeve are all connected. The upper hole, the lower hole and the side hole of the sleeve are all provided with internal threads.

[0006] A sealing gasket is installed inside the sealing groove.

[0007] Compared with the prior art, the beneficial effects of this utility model are:

[0008] This invention provides a pressure measuring device for an oxygen bomb calorimeter, which solves the problem mentioned in the background art: currently, there is no pressure measuring device designed to fit an oxygen bomb calorimeter.

[0009] This device can simultaneously measure the pressure inside the oxygen bomb calorimeter cylinder in real time. It can not only detect the airtightness of the oxygen bomb device but also acquire the changes in gas pressure inside the oxygen bomb during the measurement process. The operator can obtain the internal pressure of the oxygen bomb calorimeter during the combustion reaction. By analyzing data such as the relationship between pressure and reaction progress, the device can obtain the calorific value of the analyte (including pure substances and mixtures), calculate the gas fugacity factor and reaction rate, assess the combustion reaction process, and examine the impact of pressure changes on the calorific value. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the socket structure;

[0011] Figure 2 This is a schematic diagram of the stopcock structure;

[0012] Figure 3 This is a schematic diagram showing the use of the sleeve and the stopper rod in conjunction. Detailed Implementation

[0013] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0014] A pressure measuring device for an oxygen bomb calorimeter includes: a sleeve 1 and a plug rod 2, wherein the plug rod 2 is used in conjunction with the sleeve 1, the sleeve 1 is provided with an upper sleeve hole 1-1, the lower sleeve 1 is provided with a lower sleeve hole 1-2, the side of the sleeve 1 is provided with a side sleeve hole 1-3, the plug rod 2 is provided with an external thread 2-1, the plug rod 2 is provided with a sealing groove 2-2, and the lower end of the plug rod 2 is provided with a rod needle 2-3.

[0015] The upper hole 1-1 and the lower hole 1-2 of the sleeve are coaxially arranged. The upper hole 1-1, the lower hole 1-2 and the side hole 1-3 of the sleeve are all connected. The upper hole 1-1, the lower hole 1-2 and the side hole 1-3 of the sleeve are all provided with internal threads.

[0016] A sealing gasket is provided inside the sealing groove 2-2. The sealing gasket slides and seals against the wall of the upper hole 1-1 of the sleeve.

[0017] The working principle of this utility model is as follows:

[0018] Connect the oxygen charging nozzle of the oxygen bomb calorimeter to the lower hole 1-2 of the sleeve, connect the precision digital electronic pressure gauge to the side hole 1-3 of the sleeve, insert the plug rod 2 into the upper hole 1-1 of the sleeve, and connect it to the internal thread of the upper hole 1-1 of the sleeve through the external thread 2-1. When the upper end of the lower hole 1-2 of the sleeve is flush with the lower end of the rod needle 2-3, the upper hole 1-1 of the sleeve is sealed by the connection of the external thread 2-1 and the internal thread and the sealing gasket, thus completing the assembly of the sleeve 1 and the plug rod 2. Rotate the plug rod 2 to move the rod needle 2-3 downward and insert it into the oxygen charging nozzle of the oxygen bomb calorimeter. At this time, the oxygen charging nozzle of the oxygen bomb calorimeter is pushed open by the rod needle 2-3, and the gas inside the oxygen bomb calorimeter enters through the lower hole 1-2 of the sleeve, diffuses to the side hole 1-3 of the sleeve, and is directly connected to the precision digital electronic pressure gauge to display the reading.

[0019] Pressure changes during combustion within an oxygen bomb calorimeter can be displayed and measured in real time using a precision digital pressure gauge. Furthermore, the airtightness of the oxygen bomb calorimeter can be checked using this same gauge.

[0020] The precision digital electronic pressure gauge is an existing technology that is outsourced.

[0021] Implementation Case 1: 0.9859g of benzoic acid sample was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The pressure measuring device measured the initial pressure as 1.211MPa, and the pressure inside the cylinder after combustion was measured as 1.160MPa. The actual pressure during the combustion process can be calculated to be 0.051MPa. The theoretical pressure after combustion is 1.178MPa, and the fugacity factor is 0.985.

[0022] Implementation Case 2: A 1.0316g sucrose sample was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The pressure measuring device measured the initial pressure as 1.209MPa. After combustion, the pressure inside the cylinder was measured as 1.206MPa. It can be calculated that the pressure during the combustion process became 0.003MPa. The theoretical pressure after combustion is 1.209MPa, and the fugacity factor is 0.998.

[0023] Implementation Case 3: 0.9849 g of cinnamic acid sample was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The pressure measuring device measured the initial pressure as 1.218 MPa, and the pressure after combustion was measured as 1.149 MPa. The pressure during the combustion process can be calculated to be 0.069 MPa. The theoretical pressure after combustion is 1.163 MPa, and the fugacity factor is 0.988.

[0024] Implementation Case 4: 0.8303g of naphthalene sample was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The initial pressure was measured to be 1.199MPa. After combustion, the pressure was measured to be 1.084MPa, and the pressure during the combustion process was calculated to be 0.115MPa. The theoretical pressure after combustion is 1.092MPa, and the fugacity factor is 0.992.

[0025] Implementation Case 5: Frozen pears were juiced, filtered, and freeze-dried to obtain the sugar content. A 1.2602g sample of frozen pear sugar was placed in an oxygen bomb calorimeter, sealed, and filled with pure oxygen. The initial pressure was measured to be 1.193MPa. After combustion, the pressure was measured to be 1.182MPa, indicating that the pressure during combustion became 0.011MPa.

[0026] Implementation Case 6: A 1.6727g sample of heating straw was placed in an oxygen bomb calorimeter, sealed, and filled with pure oxygen. The initial pressure was measured to be 1.209MPa. After combustion, the pressure was measured to be 1.159MPa, and the pressure during the combustion process was calculated to be 0.050MPa.

[0027] Implementation Case 7: A 0.6295g sample of mixed coal was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The pressure measuring device measured the initial pressure as 1.984MPa. After combustion, the measured pressure was 1.936MPa, and it can be calculated that the pressure during the combustion process of this sample became 0.048MPa.

[0028] Implementation Case 8: A 0.6125g standard coal sample was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The pressure measuring device measured the initial pressure as 2.429MPa. After combustion, the measured pressure was 2.332MPa, and it can be calculated that the pressure during the combustion process of this sample became 0.097MPa.

[0029] Implementation Case 9: A 0.8640g kerosene sample was placed in an oxygen bomb calorimeter, sealed, and then filled with pure oxygen. The pressure measuring device measured the initial pressure as 1.312MPa. After combustion, the measured pressure was 1.053MPa, and it can be calculated that the pressure during the combustion process of this sample became 0.259MPa.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pressure measuring device for an oxygen bomb calorimeter, characterized in that: include: A sleeve (1) and a plug rod (2) are used in conjunction with the sleeve (1). The sleeve (1) is provided with an upper hole (1-1), a lower hole (1-2) is provided below the sleeve (1), a side hole (1-3) is provided on the side of the sleeve (1), an external thread (2-1) is provided on the plug rod (2), a sealing groove (2-2) is provided on the plug rod (2), and a rod needle (2-3) is provided at the lower end of the plug rod (2).

2. The pressure measuring device for an oxygen bomb calorimeter according to claim 1, characterized in that: The upper hole (1-1) and the lower hole (1-2) of the sleeve are coaxially arranged. The upper hole (1-1), the lower hole (1-2) and the side hole (1-3) of the sleeve are all connected. The upper hole (1-1), the lower hole (1-2) and the side hole (1-3) of the sleeve are all provided with internal threads.

3. A pressure measuring device for an oxygen bomb calorimeter according to claim 2, characterized in that: A sealing gasket is provided inside the sealing groove (2-2).

Images