Liquid oxygen analysis evaporator for air separation

Abstract

The utility model provides a liquid oxygen analysis evaporator for air separation, which comprises an evaporator cover plate, the evaporator cover plate is provided with a nitrogen input port, and the nitrogen input port is connected with a nitrogen input source; based on dryness and suffocation of the nitrogen, after the nitrogen is introduced into the liquid oxygen analysis evaporator, wet air in the liquid oxygen analysis evaporator is replaced, the pressure in the cylinder is maintained to be micro-positive pressure, it can be ensured that freezing cannot be formed between an internal patch type thermometer and a low-temperature pipeline, the accuracy of a measured value is guaranteed, and the measurement accuracy of the liquid oxygen analysis evaporator is improved. And the workload of workers and the deicing risk are reduced, and the probability of analyzing fires in the evaporator is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of deep-cold gas analysis, in particular to a liquid oxygen analysis evaporator for air separation. Background Art

[0002] The liquid oxygen analysis evaporator currently used in the air separation industry is equipped with a chip thermometer inside. The temperature controller controls the electric heater to heat the low-temperature liquid. The heated medium is transported to the analysis room through the analysis pipeline, and then the analyzer is used to detect the medium components. The analysis evaporator cylinder is filled with insulation cotton or pearlescent sand to keep it cold and prevent the external wet air from condensing and freezing. However, due to poor manufacturing precision, the sealing effect is not good. A thin layer of ice will form between the internal chip thermometer and the low-temperature pipeline, resulting in high measured values, continuously triggering high temperature alarms, and affecting the judgment of process personnel. In order to avoid frequent high temperature alarms, the inlet discharge valve of the analysis evaporator needs to be opened to maintain low temperature. As time goes by, the discharge port will also freeze in large quantities, which will increase the workload of the staff and the risk of deicing. At the same time, the use of electric heaters inside the liquid oxygen analysis evaporator is prone to fire. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides a liquid oxygen analysis evaporator for air separation, which is used to solve the technical problem of ice formation inside the liquid oxygen analysis evaporator in the prior art.

[0004] The utility model is realized by the following technical solutions:

[0005] A liquid oxygen analysis evaporator for air separation comprises an evaporator cover plate, wherein the evaporator cover plate is provided with a nitrogen input port, and the nitrogen input port is connected to a nitrogen input source.

[0006] Furthermore, the nitrogen inlet is provided with a pressure reducing valve.

[0007] Furthermore, the nitrogen inlet is provided with a pressure gauge.

[0008] Furthermore, the nitrogen inlet is provided with a flow meter.

[0009] Furthermore, the nitrogen input source is high-purity nitrogen with a dew point below -°C.

[0010] Furthermore, the evaporator cover plate is sealed with a nitrogen inlet.

[0011] Furthermore, the nitrogen inlet adopts a stainless steel flexible joint.

[0012] Furthermore, the input pressure of the nitrogen input source is greater than the gas pressure in the liquid oxygen analysis evaporator.

[0013] Furthermore, it also includes a liquid oxygen analysis evaporator cavity, which includes an inlet vent and an outlet vent. A temperature controller and a patch thermometer are arranged inside the liquid oxygen analysis evaporator cavity. One end of the patch thermometer is located at the inlet vent, and the other end is located at the outlet vent. The bottom of the liquid oxygen analysis evaporator cavity is connected to a gas analysis device.

[0014] Furthermore, the temperature controller is located on one side of the patch thermometer, and the length of the temperature controller is consistent with that of the patch thermometer, and the temperature controller includes an electric heater.

[0015] Compared with the prior art, the utility model has the following beneficial technical effects:

[0016] The utility model provides a liquid oxygen analysis evaporator for air separation, comprising an evaporator cover plate, wherein the evaporator cover plate is provided with a nitrogen input port, and the nitrogen input port is connected to a nitrogen input source; based on the dryness and asphyxiation of nitrogen, after nitrogen is introduced into the liquid oxygen analysis evaporator, the wet air in the liquid oxygen analysis evaporator is replaced, and the pressure in the cylinder is maintained at a slightly positive pressure, so that ice is not formed between the internal patch thermometer and the low-temperature pipeline, the accuracy of the measured value is guaranteed, the workload of the staff and the risk of deicing are reduced, and the probability of fire in the analysis evaporator is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a liquid oxygen analysis evaporator for air separation in an embodiment of the present disclosure is shown;

[0018] Figure 2 A schematic diagram of the structure inside a liquid oxygen analysis evaporator for air separation in an embodiment of the present disclosure is shown;

[0019] Figure 3 The detection value of the patch thermometer in the embodiment of the present disclosure is shown.

[0020] In the figure: 1. Evaporator cover; 2. Nitrogen inlet; 3. Nitrogen input source; 10. Liquid oxygen analysis evaporator cavity; 11. Temperature controller; 12. SMD thermometer; 13. Electric heater. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, products or devices.

[0024] The present disclosure provides a liquid oxygen analysis evaporator for air separation, such as Figure 1 and Figure 2 As shown, it includes an evaporator cover plate 1, and the evaporator cover plate 1 is provided with a nitrogen inlet 2, and the nitrogen inlet 2 is connected to a nitrogen input source 3; in the embodiment of the present disclosure, the nitrogen inlet 2 is sealed and welded to the evaporator cover plate 1, and the nitrogen inlet 2 adopts a stainless steel flexible joint, specifically, a 304 stainless steel flexible joint with a diameter of Φ6 is adopted; the nitrogen input source 3 is high-purity nitrogen with a dew point lower than -95°C, and the high-purity nitrogen with a dew point lower than -95°C has an extremely low humidity content, and the high-purity nitrogen usually also contains very few impurities, such as oxygen, hydrocarbons, etc., and the high-purity nitrogen is an inert gas, which has high stability and safety.

[0025] Preferably, in the embodiment of the present disclosure, the nitrogen inlet 2 is provided with a pressure reducing valve. Specifically, the pressure reducing valve reduces the nitrogen inlet pressure to a certain required outlet pressure, and relies on the energy of the medium itself to automatically keep the outlet pressure stable, thereby being able to stably input the nitrogen inlet 2 and preventing the pressure inside the liquid oxygen analysis evaporator cavity 10 from being unstable.

[0026] Furthermore, the nitrogen inlet 2 is provided with a pressure gauge and / or a flow meter. It should be noted that the pressure reducing valve, pressure gauge and flow meter can be used in combination according to actual conditions to detect the volume and pressure of nitrogen input into the liquid oxygen analysis evaporator cavity 10 per unit time, and then to stabilize the pressure inside the liquid oxygen analysis evaporator cavity 10.

[0027] Preferably, in the embodiment of the present disclosure, the input pressure of the nitrogen input source 3 is greater than the gas pressure in the liquid oxygen analysis evaporator, so as to meet the basic requirement that nitrogen can be input into the analysis evaporator cavity 10 .

[0028] Preferably, in the embodiment of the present disclosure, a liquid oxygen analysis evaporator cavity 10 is further included, and the liquid oxygen analysis evaporator cavity 10 includes an inlet vent and an outlet vent. A temperature controller 11 and a patch thermometer 12 are arranged inside the liquid oxygen analysis evaporator cavity 10, and one end of the patch thermometer 12 is located at the inlet vent, and the other end is located at the outlet vent; the bottom of the liquid oxygen analysis evaporator cavity 10 is connected to a gas analysis device.

[0029] Furthermore, the temperature controller 11 is located on one side of the patch thermometer 12 , and the length of the temperature controller 11 is consistent with that of the patch thermometer 12 . The temperature controller 11 includes an electric heater 13 .

[0030] When the utility model is in use, the nitrogen input source 3 inputs nitrogen into the liquid oxygen analysis evaporator cavity 10 through the nitrogen input port 2, and the nitrogen entrains the wet air inside the liquid oxygen analysis evaporator cavity 10 to squeeze and discharge it, thereby preventing the liquid oxygen analysis evaporator cavity 10 from freezing.

[0031] from Figure 3 It can be seen that between July and October 2023, the analytical evaporator under the liquid oxygen storage tank was cleaned of ice in the cylinder many times, the insulation material was replaced, and the gap was sealed with glue, but the detection value of the patch thermometer 12 at the inlet vent still fluctuated frequently and could not meet the process requirements.

[0032] Between November and December 2023, cold insulation materials were added to the liquid oxygen analysis evaporator cavity 10 and the discharge pipe. The measurement value of the patch thermometer 12 at the inlet vent could meet the requirements, but the discharge port was severely frozen and liquid oxygen continued to spray out, posing a major safety hazard.

[0033] On December 25, 2023, the present application scheme was adopted, and a nitrogen inlet 2 and a nitrogen input source 3 were added. After one month of monitoring and operation, the detection value of the patch thermometer 12 at the inlet vent was always maintained below -160°C, meeting the process requirements. The icing at the vent port behind the inlet discharge valve was also significantly reduced, and no liquid discharge occurred again.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A liquid oxygen analysis evaporator for air separation, characterized in that: The invention comprises an evaporator cover plate (1), wherein the evaporator cover plate (1) is provided with a nitrogen input port (2), wherein the nitrogen input port (2) is connected to a nitrogen input source (3); and further comprises a liquid oxygen analysis evaporator cavity (10), wherein the liquid oxygen analysis evaporator cavity (10) comprises an inlet vent and an outlet vent, wherein a temperature controller (11) and a patch type thermometer (12) are arranged inside the liquid oxygen analysis evaporator cavity (10), wherein one end of the patch type thermometer (12) is located at the inlet vent and the other end is located at the outlet vent; and a gas analysis device is connected to the bottom of the liquid oxygen analysis evaporator cavity (10).

2. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The nitrogen input port (2) is provided with a pressure reducing valve.

3. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The nitrogen input port (2) is provided with a pressure gauge.

4. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The nitrogen inlet (2) is provided with a flow meter.

5. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The nitrogen input source (3) is high-purity nitrogen with a dew point below -95°C.

6. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The evaporator cover plate (1) is sealed with a nitrogen inlet (2).

7. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The nitrogen inlet (2) is a stainless steel flexible joint.

8. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The input pressure of the nitrogen input source (3) is greater than the gas pressure in the liquid oxygen analysis evaporator.

9. The liquid oxygen analysis evaporator for air separation according to claim 1, characterized in that: The temperature controller (11) is located on one side of the patch thermometer (12), and the temperature controller (11) and the patch thermometer (12) have the same length. The temperature controller (11) includes an electric heater (13).

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