Sleeve condenser suitable for Kjeldahl apparatus

Abstract

The double-pipe condenser comprises an inner pipe and an outer pipe which are coaxially connected in a sleeved mode, a pipe opening of the outer pipe is connected to a first connector of a three-way connector, the outer pipe is communicated with a third connector of the three-way connector, and the inner pipe penetrates through the inside of the three-way connector and extends out of a second connector by a set distance. The outer wall face of the inner pipe is connected with the second connector. The condenser is formed by the inner pipe and the outer pipe which are coaxially connected in a sleeved mode, so that a cooling medium conveyed by the outer pipe is not prone to generating a dead zone, the flowing speed of the cooling medium is increased, heat in a distillation product can be rapidly taken away, and the condensation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Kjeldahl nitrogen analyzers, in particular to a jacketed tube condenser suitable for Kjeldahl nitrogen analyzers. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The Kjeldahl method is a method for measuring the protein content in a sample based on nitrogen. After the sample is digested, the organic nitrogen in the protein is converted into ammonium salts and further converted into ammonia. After distillation and condensation, the ammonia gas is collected and absorbed. The nitrogen content in the sample is calculated by calibrating the ammonia content in the absorption liquid, thereby completing the protein content detection.

[0004] In the Kjeldahl nitrogen analyzer, a condenser is used to condense the distillation product. The common condenser is a sleeve structure, that is, the outer side of the condenser tube is connected to the sleeve, the distillation product is transmitted inside the condenser tube, and the outer side is placed in the sleeve. The cooling medium flowing in the sleeve is used to take away the heat in the distillation product, thereby completing the condensation process.

[0005] Under this structure, the sleeve is a relatively larger container, and the flow rate of the cooling medium inside it is relatively low, making it difficult for the heat released by the condenser to be quickly taken away, resulting in an unsatisfactory condensation effect; some existing technologies use spiral condensers to increase the heat exchange area to improve the condensation effect, but the spiral condenser will form a more complex flow channel than the sleeve, which can easily lead to the formation of a dead zone for the cooling medium on the outside of the condenser, resulting in poor flow of the cooling medium, insufficient heat exchange, and unsatisfactory condensation efficiency of the Kjeldahl nitrogen analyzer. Utility Model Content

[0006] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a sleeve condenser suitable for a Kjeldahl nitrogen analyzer, which uses a coaxial sleeved inner tube and an outer tube to form a spiral condenser. The heat medium flows in the inner tube and the cooling medium flows in the outer tube. The flow directions of the two are opposite. On the basis of ensuring the heat exchange area, the flow rate of the cooling medium can be accelerated and the dead zone area of ​​the cooling medium can be reduced. The sleeve can also be arranged on the outside of the outer tube to further improve the condensation effect by using another cooling medium.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] The first aspect of the utility model provides a sleeve condenser suitable for a Kjeldahl nitrogen analyzer, comprising an inner tube and an outer tube which are coaxially sleeved, wherein the pipe mouth of the outer tube is connected to a first interface of a three-way joint, the outer tube is communicated with a third interface of the three-way joint, the inner tube passes through the interior of the three-way joint and extends out of the second interface for a set distance, and the outer wall surface of the inner tube is connected to the second interface.

[0009] Furthermore, the combination formed by the inner tube and the outer tube is spiral-shaped, and the inner tube extends out of the tube opening of the outer tube by a set distance.

[0010] Furthermore, the first interface and the second interface are arranged opposite to each other, and the diameters of the two interfaces are different.

[0011] Furthermore, the third interface is a medium interface, and the medium interface is arranged opposite to the end cover.

[0012] Furthermore, the medium in the inner tube and the medium in the outer tube flow in opposite directions.

[0013] Furthermore, an annular gap is formed between the inner tube and the outer tube.

[0014] Furthermore, a sleeve is provided, and a combination of the inner tube and the outer tube is arranged inside the sleeve.

[0015] Furthermore, the inner tube extends to the outside of the sleeve and is connected to a heat medium interface on the wall of the sleeve for receiving the distillation product and discharging the condensed liquid.

[0016] Furthermore, the outer tube is communicated with the third interface, and the third interface is connected to the first cooling medium interface on the wall of the sleeve through a pipeline for accessing the first cooling medium.

[0017] Furthermore, a second cooling medium interface is provided on the wall surface of the sleeve, and the second cooling medium interface is communicated with the interior of the sleeve for receiving the second cooling medium.

[0018] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0019] 1. The condenser is formed by the coaxially sleeved inner and outer tubes, so that the cooling medium transmitted by the outer tube is not easy to produce dead zones, and the flow rate of the cooling medium is accelerated, so that the heat in the distillation product can be quickly taken away, and the condensation effect of the Kjeldahl nitrogen analyzer is improved.

[0020] 2. The three-way joint connecting the inner tube and the outer tube is formed by processing a section of pipe. It has a simple structure, is easy to obtain materials, and is not prone to leakage. The direction of the medium interface is conducive to the maintenance of the Kjeldahl nitrogen analyzer, so as to drain the cooling medium.

[0021] 3. The sleeve can also be arranged on the outside of the outer tube, and another cooling medium can be used to further improve the condensation effect, so that the heat generated by the heat medium in the inner tube passes through the wall of the inner tube to reach the first cooling medium between the inner tube and the outer tube, and then further passes through the wall of the outer tube to reach the second cooling medium between the outer tube and the sleeve. The first cooling medium flowing in the outer tube and the second cooling medium circulating in the sleeve jointly reduce the temperature of the heat medium, thereby further improving the condensation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 It is a structural schematic diagram of a condenser formed by a group of combined bodies provided by the utility model;

[0024] Figure 2 It is a structural schematic diagram of a three-way joint in a condenser provided by the utility model;

[0025] Figure 3 It is a structural schematic diagram of a condenser formed by two groups of assemblies provided by the utility model.

[0026] In the figure: 1 inner tube, 2 outer tube, 3 tee joint, 31 end cover, 32 medium interface, 33 outer tube interface, 34 inner tube interface, 4 connecting tube. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] As introduced in the background technology, the condenser in the Kjeldahl nitrogen analyzer condenses the distillation product. The common condenser is a sleeve structure, that is, the outer side of the condenser tube is sleeved with a sleeve, the distillation product is transmitted inside the condenser tube, and the outer side is placed in the sleeve. The heat in the distillation product is taken away by the cooling medium flowing in the sleeve, thereby completing the condensation process. The sleeve is a container with a relatively larger volume, and the flow rate of the cooling medium inside it is relatively low, so that the heat released from the condenser tube to the outside is difficult to be quickly taken away, resulting in an unsatisfactory condensation effect; some existing technologies use spiral condensers to increase the heat exchange area to improve the condensation effect, but the spiral condenser tube will form a more complex flow channel than the sleeve, which is easy to cause a dead zone for the cooling medium on the outside of the condenser tube, so that the cooling medium flows poorly, resulting in insufficient heat exchange, and the condensation efficiency of the Kjeldahl nitrogen analyzer is unsatisfactory.

[0030] Therefore, the following embodiment provides a jacketed condenser suitable for a Kjeldahl nitrogen analyzer, wherein the condenser is formed by coaxially sleeved inner and outer tubes, so that the cooling medium transmitted by the outer tube is not prone to dead zones, and the flow rate of the cooling medium is accelerated, so that the heat in the distillation product can be quickly taken away, thereby improving the condensation effect of the Kjeldahl nitrogen analyzer.

[0031] Embodiment 1:

[0032] like Figure 1-Figure 2 As shown, a sleeve condenser suitable for a Kjeldahl nitrogen analyzer comprises an inner tube 1 and an outer tube 2 which are coaxially sleeved, wherein the tube mouth of the outer tube 2 is connected to the first interface of a three-way joint 3, the outer tube 2 is communicated with the third interface of the three-way joint 3, the tube mouth of the inner tube 1 passes through the interior of the three-way joint 3 and is connected to the second interface, and extends out of the second interface by a set distance.

[0033] In this embodiment, the pipe mouth of the outer tube 2 is connected to the outer tube interface 33 of the tee joint 3, the outer tube 2 is connected to the medium interface 32 of the tee joint 3, the pipe mouth of the inner tube 1 passes through the inside of the tee joint 3 and is connected to the inner tube interface 34, and extends out of the inner tube interface 34 to a set distance.

[0034] The three-way joint 3 comprises an outer pipe interface 33 and an inner pipe interface 34 which are arranged opposite to each other. The diameters of the two interfaces are different. The medium interface 32 is arranged opposite to the end cover 31 .

[0035] The connecting line between the outer tube interface 33 and the inner tube interface 34 is perpendicular to the connecting line formed by the medium interface 32 and the end cover 31 .

[0036] The three-way joint 3 in this embodiment is a pipe of a set length. One end of the pipe is closed by an end cap 31. Two holes of different diameters are opened on both sides of the pipe as interfaces for connecting the outer pipe and the inner pipe respectively, thereby forming a three-way joint 3. This structure is simple to process and easy to obtain materials.

[0037] The inner tube 1 and the outer tube 2 form a spiral shape, and the inner tube 1 extends out of the tube mouth of the outer tube 2 for a distance. During assembly, since the inner tube 1 is longer, after the three-way joint 3 is inserted into the inner tube 1, one of the interfaces (the outer tube interface 33) is first connected to the wall of the outer tube 2, and welding is preferably used to avoid leakage. Then the other interface (the inner tube interface 34) is connected to the wall of the inner tube 1, and welding is also preferably used to avoid leakage. The medium interface 32 faces downward to facilitate the drainage of the liquid in the outer tube 2 during condenser maintenance.

[0038] The inner tube 1 is used to transport heat medium. The heat medium in this embodiment is the distillation product in the nitrogen determination process.

[0039] The outer tube 2 is used to transmit a cooling medium. The cooling medium in this embodiment is water, which is used to reduce the heat in the distillation product so that the ammonia gas therein is condensed and absorbed by the absorption liquid.

[0040] The media in the inner tube 1 and the outer tube 2 flow in opposite directions, forming a countercurrent heat exchange form.

[0041] The inner tube 1 and the outer tube 2 may be made of different materials to meet different working conditions. For example, the inner tube 1 may be made of 316L stainless steel, titanium alloy, etc.; the outer tube 2 may be made of 304 stainless steel, etc.

[0042] According to different working conditions, the inner tube 1 can be made of seamless tubes of φ6, φ6.35, and φ8, so that the outer surface area of ​​the inner tube 1 is adapted to the heat dissipation power. 2 The heat exchange capacity corresponding to the surface area is between 5 and 60kW.

[0043] The annular gap formed between the inner tube 1 and the outer tube 2 is 0.5 to 3 mm.

[0044] Through the above structure, the sleeve connection between the inner tube 1 and the outer tube 2 makes it difficult for dead zones to be generated inside the outer tube 2, and accelerates the flow rate of the cooling medium, so that the heat in the heat medium can be quickly taken away, thereby improving the condensation effect.

[0045] According to actual working conditions, the condenser can be placed in a sleeve and another cooling medium can be used in the sleeve to further improve the condensation effect.

[0046] The combination formed by the inner tube 1 and the outer tube 2 is connected inside the sleeve. The part of the inner tube 1 extending out of the inner tube interface 34 is extended until it extends out of the sleeve, which is used to connect the external heat medium and send the condensed medium to the subsequent process unit. Since the outer tube 2 is connected with the medium interface 32 on the three-way joint 3, the medium interface 32 is connected to the wall of the sleeve through a pipeline for connecting the cooling medium; at the same time, the wall of the sleeve is provided with an interface for connecting another cooling medium, so that the heat generated by the heat medium in the inner tube 1 passes through the wall of the inner tube 1 to the cooling medium between the inner tube 1 and the outer tube 2, and further passes through the wall of the outer tube 2 to reach the other cooling medium between the outer tube 2 and the sleeve. The cooling medium flowing in the outer tube 2 and the other cooling medium circulating in the sleeve, the two parts of the cooling medium jointly reduce the temperature of the heat medium, so that the heat in the distillation product can be quickly taken away, further improving the condensation effect of the Kjeldahl nitrogen analyzer.

[0047] By adopting the above-mentioned method of being placed in the sleeve, the cooling medium in the outer tube 2 and the cooling medium in the sleeve can be the same or different.

[0048] The number of the combination formed by the inner tube 1 and the outer tube 2 is not limited, for example Figure 3 In the embodiment, there are two groups of inner tubes 1 and outer tubes 2 formed by a combination, and the outer tubes 2 of the two groups of the combination are connected by a connecting pipe 4 for a common cooling medium, while the inner tubes 1 are not connected, so that the heat medium in the inner tubes 1 is cooled by the cooling medium in the outer tubes 2 in parallel, thereby obtaining a higher cooling efficiency. In this structure, the orientation of each pipe opening can be arranged according to actual needs.

[0049] A pagoda-shaped structure may also be provided on the medium interface 32 of the three-way connector 3 for connecting a hose.

[0050] The above structure is applied in the Kjeldahl nitrogen analyzer. The Kjeldahl nitrogen determination method is a method for measuring the protein content in a sample based on nitrogen element, that is, using concentrated sulfuric acid to digest the sample, converting all organic nitrogen in the sample into inorganic ammonium salts, and then converting the ammonium salts into ammonia under alkaline conditions. The ammonia is distilled out with water vapor and absorbed by excess boric acid solution, and then titrated with standard hydrochloric acid. The amount of nitrogen in the sample can be calculated based on the consumed standard hydrochloric acid.

[0051] In the Kjeldahl nitrogen analyzer, the sample is dissolved in concentrated sulfuric acid in advance to obtain a test solution, so that all proteins are converted into ammonia, and steam is passed into the digestive tract to boil the test solution, so that the ammonia in the test solution is distilled out in the form of ammonia gas, and then sent to the condenser in this embodiment for condensation, and the condensed ammonia is absorbed by the boric acid solution. During the condensation period, the sleeve connection between the inner tube 1 and the outer tube 2 makes it difficult to generate a dead zone inside the outer tube 2, and accelerates the flow rate of the cooling medium, so that the heat in the heat medium can be quickly taken away, improving the condensation effect.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer, characterized in that: It includes an inner tube and an outer tube that are coaxially sleeved, the tube mouth of the outer tube is connected to the first interface of the three-way joint, the outer tube is communicated with the third interface of the three-way joint, the inner tube passes through the inside of the three-way joint and extends out of the second interface for a set distance, and the outer wall surface of the inner tube is connected to the second interface.

2. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 1, characterized in that: The combination formed by the inner tube and the outer tube is spiral-shaped, and the inner tube extends out of the tube opening of the outer tube by a set distance.

3. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 1, characterized in that: The first interface and the second interface are arranged opposite to each other, and the diameters of the two interfaces are different.

4. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 1, characterized in that: The third interface is a medium interface, and the medium interface is arranged opposite to the end cover.

5. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 1, characterized in that: The medium in the inner tube and the medium in the outer tube flow in opposite directions.

6. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 1, characterized in that: An annular gap is formed between the inner tube and the outer tube.

7. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 1, characterized in that: A sleeve is also provided, and a combination of the inner tube and the outer tube is arranged inside the sleeve.

8. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 7, characterized in that: The inner tube extends to the outside of the sleeve and is connected to a heat medium interface on the sleeve wall, so as to receive the distillation product and discharge the condensed liquid.

9. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 7, characterized in that: The outer tube is communicated with the third interface, and the third interface is connected to the first cooling medium interface on the sleeve wall through a pipeline for receiving the first cooling medium.

10. A jacketed condenser suitable for a Kjeldahl nitrogen analyzer as claimed in claim 9, characterized in that: The sleeve wall is provided with a second cooling medium interface, which is communicated with the inside of the sleeve and is used for receiving the second cooling medium.

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