A kjeldahl apparatus batch processing digestion rack and kjeldahl apparatus

Abstract

The utility model provides a kind of kjeldahl apparatus batch processing digestion rack, comprising: pedestal unit, the pedestal unit includes base and the guide plate being perpendicular to base, the base is equipped with annular recessed embedding slot;Reaction tube, the reaction tube includes several groups of reaction tube, diverging pipe and the sliding seat being wrapped in the outside of diverging pipe, the bottom of the reaction tube extends into embedding slot.Conduit module, the end of the diverging pipe is inserted into reaction tube inside, diverging pipe is also equipped with exhaust pipe, liquid outlet pipe and liquid inlet pipe, digestion link acid gas is sent out digestion rack via exhaust pipe, the solution in the reaction tube is guided into conduit module by liquid outlet pipe under the distillation action and sends off digestion rack.The utility model can provide digestion solution of completion digestion for kjeldahl apparatus in batches, reduce the assembly action of digestion solution, improve the detection efficiency of measurement process.

Description

Technical Field

[0001] This utility model belongs to the technical field of Kjeldahl nitrogen analyzers, and particularly relates to a batch processing digestion rack and a Kjeldahl nitrogen analyzer. Background Technology

[0002] A Kjeldahl nitrogen analyzer is an instrument that calculates protein content by measuring the nitrogen content in a sample, based on the principle that the nitrogen content in proteins is constant. Because the method used to measure and calculate protein content is called the Kjeldahl nitrogen determination method, it is called a Kjeldahl nitrogen analyzer, also known as a nitrogen analyzer, protein analyzer, or crude protein analyzer.

[0003] Currently, Kjeldahl nitrogen analyzers require digestion during measurement and calculation. However, most automated Kjeldahl nitrogen analyzers require pretreatment before the pretreated solution from a single module is placed into the Kjeldahl nitrogen analyzer for measurement and analysis. Currently, Kjeldahl nitrogen analyzer equipment does not have the capability to provide digestion solutions for batch pretreatment, resulting in frequent refilling of digestion solutions, cumbersome operation, and low detection efficiency. Utility Model Content

[0004] This utility model provides a batch processing digestion rack for a Kjeldahl nitrogen analyzer. The utility model is implemented as follows: A batch processing digestion rack for a Kjeldahl nitrogen analyzer includes: A base unit, the base unit including a base platform and a guide plate disposed perpendicular to the base platform, the base platform being provided with an annular recessed embedding groove; The reaction fitting includes several sets of reaction tubes, branch tubes, and a sliding seat wrapped around the outside of the branch tubes. The sliding seat slides on a guide plate. The guide plate is provided with a support module for supporting the reaction tubes. The reaction tubes are placed on the support module, and the bottom of the reaction tubes extends into the embedding groove.

[0005] The conduit module has a branch pipe inserted into the reaction tube. The branch pipe is also equipped with an exhaust pipe, a liquid outlet pipe, and a liquid inlet pipe. During the digestion process, the acid gas is sent out of the digestion rack through the exhaust pipe. The solution in the reaction tube is distilled and then introduced into the conduit module through the liquid outlet pipe and sent away from the digestion rack.

[0006] Preferably, the branch pipe includes a collecting pipe and a reflux pipe. The collecting pipe is provided with a heating ring on the outside for heating. The heating plate and the heating ring heat both ends of the reaction chamber. The reflux pipe is provided with a condenser on the outside. The reflux pipe located at the top of the collecting pipe forms a low-temperature zone under the action of the condenser of the coil structure, allowing the acid gas to be cooled and refluxed to participate in the reaction again, avoiding the direct discharge of excess acid gas from the reaction chamber. The exhaust pipe, liquid outlet pipe and liquid inlet pipe are all located on the side wall of the reflux pipe.

[0007] Preferably, the base is provided with a heating plate, which is located at the bottom of the embedding groove. After the end of the reaction tube extends into the embedding groove, the heat generated by the heating plate is transferred to the reaction tube through the embedding groove.

[0008] Preferably, the support module includes a semi-support ring and a retaining ring disposed near the embedding groove. The semi-support ring has a semi-open structure, the top of the reaction tube has a rolled end structure, the reaction tube is engaged with the semi-support ring, and the end of the reaction tube extends into the embedding groove after passing through the retaining ring.

[0009] Preferably, the diameter of the reflux pipe is smaller than that of the collection pipe, and the reflux pipe and the collection pipe are connected by a reducer. During the digestion process, the acid gas refluxes back to the collection pipe under the condensation effect in the reflux pipe.

[0010] Preferably, the catheter module has two sets of pipeline systems inside. The pipeline system includes a main pipe and a connecting pipe that communicates with the main pipe. The connecting pipe communicates with the outside of the catheter module. The outlet pipe and the inlet pipe are respectively connected to the connecting pipes in different pipeline systems.

[0011] Preferably, the exhaust pipe is equipped with a pressure relief safety valve. The pressure relief safety valve in the exhaust pipe can maintain stable internal pressure and prevent premature release of acid gas, which would result in energy consumption.

[0012] A Kjeldahl nitrogen analyzer including the batch digestion rack of the Kjeldahl nitrogen analyzer as described above, wherein the side wall of the Kjeldahl nitrogen analyzer is provided with an assembly cavity for accommodating the batch digestion rack of the Kjeldahl nitrogen analyzer, the conduit module is disposed in the assembly cavity, the reaction tube and the base unit are assembled to form a digestion module and then pushed into the assembly cavity, and the digestion module is connected to the conduit module.

[0013] Preferably, the assembly cavity is provided with a limiting frame and a limiting rod for limiting the digestion module. The limiting frame is provided with a limiting inclined surface adapted to the base. After the base abuts against the limiting frame, the limiting rod is assembled in the assembly cavity and limits the sliding of the base.

[0014] Preferably, the assembly cavity is provided with a purification pipe for recovering acid gas, and the outside of the assembly cavity is provided with an outer cover plate to seal the assembly cavity. The assembly cavity is isolated from the outside through the outer cover plate, and the flue gas generated during the digestion process is discharged from the assembly cavity by the purification pipe through negative pressure.

[0015] Compared with the prior art, the embodiments of this application have the following main advantages: The batch digestion rack for the Kjeldahl nitrogen analyzer provided by this utility model can be assembled with the reaction tubing and base unit to form a digestion module. A conduit module is used to connect the reaction tubing. Through diversified assembly, the reaction tubing can be assembled under normal conditions. Combined with the base unit, it forms an integrated digestion module. With a conduit module that facilitates the injection of reagents and vapor, it can provide batch digestion solutions for the Kjeldahl nitrogen analyzer, reducing the assembly of digestion solutions and improving the detection efficiency of the measurement process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model.

[0017] Figure 2 This is a schematic diagram of the digestion module structure of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model.

[0018] Figure 3 This is a schematic diagram of the base unit structure of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model.

[0019] Figure 4 This is a schematic diagram of the digestion module and assembly cavity in a batch processing digestion rack of a Kjeldahl nitrogen analyzer provided by this utility model.

[0020] Figure 5 This is a schematic diagram of the digestion module and assembly chamber structure of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model after separation.

[0021] Figure 6 This is a schematic diagram of the digestion module and conduit module of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model.

[0022] Figure 7 This is a schematic diagram of the branch tube structure of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model.

[0023] Figure 8 This is a schematic diagram of the tubing module structure of a batch processing digestion rack for a Kjeldahl nitrogen analyzer provided by this utility model.

[0024] Explanation of reference numerals in the attached figures: 110. Nitrogen analyzer main unit; 120. Outer cover plate; 130. Limiting frame; 140. Card holder; 150. Limiting rod; 160. Spring locking tongue; 101. Assembly cavity; 200. Base unit; 210. Base platform; 220. Guide plate; 230. Support plate; 201. Half support ring; 202. Embedded groove; 203. Snap ring; 300. Reaction fittings; 310. Reaction tube; 320. Branch pipe; 330. Sliding seat; 301. Guide insertion tube; 302. Exhaust pipe; 303. Liquid outlet pipe; 304. Liquid inlet pipe; 321. Collection pipe; 322. Return pipe; 410. Heating plate; 420. Heating ring; 430. Condenser tube; 500. Conduit module; 510. Main pipe; 520. Insertion pipe; 530. Electromagnetic control valve. Detailed Implementation

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] This utility model embodiment provides a batch processing digestion rack for a Kjeldahl nitrogen analyzer, such as... Figures 1-8 As shown, the batch processing digestion rack of the Kjeldahl nitrogen analyzer includes: The base unit 200 includes a base 210 and a guide plate 220 disposed perpendicular to the base 210. The base 210 is provided with an annular recessed embedding groove 202. A heating plate 410 is provided inside the base 210. The heating plate 410 is located at the bottom of the embedding groove 202. After the end of the reaction tube 310 of the heating plate 410 extends into the embedding groove 202, the heat generated by the heating plate 410 is transferred to the reaction tube 310 through the embedding groove 202. Several sets of reaction tubes 300, each reaction tube 300 including a reaction tube 310, a branch tube 320 and a sliding seat 330 wrapped around the outside of the branch tube 320. The sliding seat 330 slides on a guide plate 220. The guide plate 220 is provided with several sets of support modules for supporting the reaction tubes 310. The reaction tubes 310 are placed one by one on the support modules. The bottom of the reaction tube 310 extends into the embedding groove 202. After the reaction tube 310 is placed, the reaction tube 310 and the branch tube 320 form a reaction chamber in a one-to-one correspondence. The sliding seat 330 is used to fix several groups of branch tubes 320. The sliding seat 330 can raise and lower all the branch tubes 320 at the same time. By operating the sliding seat 330, multiple groups of reaction tubes 310 and branch tubes 320 can be connected one by one in a synchronous manner. The reaction tubes 310 and branch tubes 320 can achieve a sealed connection using the existing pipe opening structure. The sliding seat 330 is provided with a sliding cavity, and the sliding seat 330 is nested in the guide plate 220 through the sliding cavity. The guide plate 220 is provided with a support plate 230 for supporting the sliding seat 330. The sliding seat 330 makes room for the reaction tube 310 to be assembled by sliding. During assembly, the reactants and solution are first put into the reaction tube 310. After the reaction tube 310 is inserted into the support module, the sliding seat 330 and the branch pipe 320 provided on the sliding seat 330 are pressed into the reaction tube 310. The conduit module 500 has a branch pipe 320 whose end is inserted into the reaction tube 310. The branch pipe 320 is also equipped with an exhaust pipe 302, an outlet pipe 303, and an inlet pipe 304. The conduit module 500 has two sets of pipeline systems inside. The pipeline system includes a main pipe 510 and a connector 520 connected to the main pipe 510. The connector 520 is connected to the outside of the conduit module 500. The outlet pipe 303 and the inlet pipe 304 are respectively connected to the connector 520 in different pipeline systems. In the digestion stage, one set of pipeline systems injects concentrated sulfuric acid reagent from the outside into the reaction chamber. Specifically, the concentrated sulfuric acid reagent enters the branch pipe 320 from the inlet pipe 304 and then reaches the reaction tube 310 for digestion along the branch pipe 320. During the digestion process, the acid gas is sent out of the reaction chamber through the exhaust pipe 302. In the distillation stage, the solution in the reaction tube 310 is distilled and introduced into the other set of pipeline systems in the conduit module 500 through the outlet pipe 303.

[0028] The reaction tube 300 and the base unit 200 described in this application can be assembled to form a digestion module. The reaction tube 300 is connected to the conduit module 500 through diversified assembly. The reaction tube 300 can be assembled under normal conditions and then combined with the base unit 200 to form an integral digestion module. With the conduit module 500 which facilitates the injection of reagents and vapor, digestion solutions can be provided in batches for Kjeldahl nitrogen analyzers, reducing the assembly of digestion solutions and improving the detection efficiency of the measurement process.

[0029] In a preferred embodiment of this invention, the insertion tube 520 is equipped with an electromagnetic control valve 530; the pipeline system connected to the liquid outlet tube 303 is a distillation recovery pipeline, which guides the vapor from the distillation process to subsequent equipment, which collects and combines it with titration to complete the detection operation. In this embodiment, the pipeline system connected to the liquid inlet pipe 304 is a reagent replenishment pipeline. This pipeline mainly adds concentrated sulfuric acid or excess sodium hydroxide to the reaction tube 310 at different stages. For example, concentrated sulfuric acid is added before the digestion stage. During the digestion process, the distillation recovery pipeline needs to be closed. After digestion is completed, excess sodium hydroxide is added to the reaction tube 310 through the reagent replenishment pipeline. After the reagent addition is completed, the reagent replenishment pipeline is always closed. During the distillation process, the distillation recovery pipeline is immediately opened after steam is added to the reagent replenishment pipeline. A pressure relief safety valve is installed in the exhaust pipe 302. During the digestion process, a large amount of acid gas will be generated and diffused to the outside of the reaction pipe 300 after the pressure increases through the pressure relief safety valve. In a preferred embodiment of this invention, the branch pipe 320 includes a collecting pipe 321 and a return pipe 322. The diameter of the return pipe 322 is smaller than that of the collecting pipe 321. The return pipe 322 and the collecting pipe 321 are connected by a reducer. During the digestion process, the acid gas condenses in the return pipe 322 and flows back to the collecting pipe 321. A heating ring 420 for heating is provided on the outside of the collecting pipe 321. A condenser pipe 430 is provided on the outside of the return pipe 322. The exhaust pipe 302, the liquid outlet pipe 303, and the liquid inlet pipe 304 are all located on the side of the return pipe 322. In this embodiment, the heating plate 410, heating ring 420, and condenser 430 are all activated during the digestion process. The heating plate 410 and heating ring 420 heat both ends of the reaction chamber to ensure that the digestion process proceeds smoothly. The return pipe 322 located at the top of the collection pipe 321 forms a low-temperature zone under the action of the coiled condenser 430, allowing the acid gas to cool down and return to participate in the reaction again, preventing excessive acid gas from being directly sent out of the reaction chamber. The pressure relief safety valve installed in the exhaust pipe 302 can maintain the internal pressure stability and prevent the acid gas from being released too early, thus avoiding energy consumption. During the distillation process, the heating plate 410 and heating ring 420 are activated, while the condenser tube 430 does not participate in the condensation operation. After the distillation process is started, the internal gas in the distillation recovery pipeline will be transported to the subsequent stages from the distillation recovery pipeline, while the pressure relief safety valve will no longer open to release gas due to the stable internal gas pressure. During the digestion process, all reaction tubes 310 undergo simultaneous reaction operations. In the distillation stage, the electromagnetic control valve 530 on the connector 520 connected to the liquid outlet 303 performs distillation operations one by one in sequence. The method for determining whether to perform distillation operations relies on existing image recognition technology. The guide plate 220 is equipped with several sets of image acquisition devices facing the reaction tubes 310. Data is acquired using the image acquisition devices and evaluated by the corresponding algorithm to determine that consumption is complete. Then, the corresponding reaction chamber is activated, excess sodium hydroxide is added to the reaction chamber, and distillation is performed simultaneously after the reaction is completed.

[0030] In a further preferred embodiment of the present invention, the support module includes a semi-support ring 201 and a retaining ring 203 disposed near the embedding groove 202. The semi-support ring 201 has a semi-open structure, and the end of the reaction tube 310 extends into the embedding groove 202 after passing through the retaining ring 203. In this embodiment, the top of the reaction tube 310 has a rolled end structure. The reaction tube 310 is engaged with the semi-support ring 201 through the rolled end structure. The reaction tube 310 is suspended in the embedding groove 202 by the semi-support ring 201. The inner diameter of the retaining ring 203 is adapted to the outer diameter of the reaction tube 310. This utility model embodiment provides a Kjeldahl nitrogen analyzer including the batch processing digestion rack described above. The Kjeldahl nitrogen analyzer has an assembly cavity 101 on its side wall to accommodate the batch processing digestion rack. The conduit module 500 is disposed in the assembly cavity 101. After the reaction tube 300 and the base unit 200 are assembled to form a digestion module, they are pushed into the assembly cavity 101. The digestion module is connected to the conduit module 500. The assembly cavity 101 is also provided with a purification pipe that communicates with the outside. The purification pipe is connected to a vacuum device. The acid gas released into the assembly cavity 101 by the exhaust pipe 302 is extracted from the assembly cavity 101 by the purification pipe and the vacuum device and sent to an external waste gas recovery and treatment device for centralized treatment.

[0031] Existing automated Kjeldahl nitrogen analyzers begin with the distillation process. Before this, the sample undergoes digestion and cooling, requires dilution with water, and then proceeds with the instrument operation. Some standards specify the need to dilute the digested sample to a final volume, then accurately and quantitatively transfer it to a distillation flask (digestion tube) before operation. After setting the parameters, the instrument's workflow is as follows: 1. Connect the cooling water supply for condensing the distilled sample; 2. The steam generator automatically replenishes water; 3. Adding absorption liquid: The instrument will automatically and accurately add a certain amount of boric acid solution as absorption liquid to the receiving cup (or the receiving tube below the condenser tube).

[0032] 4. Add alkaline solution: The instrument will automatically inject a sufficient amount of concentrated sodium hydroxide solution into the digestion tube.

[0033] 5. Steam generation and distillation: Water vapor is generated inside the instrument and passed into the alkalized digestion solution. The mixture boils rapidly, and the released ammonia gas is carried out along with the water vapor.

[0034] 6. Condensation and Absorption: The mixture of ammonia and water vapor is cooled into a liquid by a condenser and flows into a receiving cup containing boric acid solution. The distillation end time is determined by a preset time or the volume of distillate.

[0035] Automatic titration uses a multi-channel syringe pump for precise quantitative titration to meet the needs of various titration solutions. The titrant is slowly added to the absorbent solution through a burette. Depending on the detection principle, the titration endpoint can be determined using an electrochemical sensor or a colorimetric sensor. The electrochemical sensor is positioned parallel to the 89 tubing, and its electrode tip should be immersed in the solution during use. The colorimetric sensor is usually externally mounted on or below the conical flask.

[0036] The instrument's internal microprocessor accurately records the volume of standard acid consumed from the start of the titration to the endpoint, and automatically calculates and displays the results based on the built-in formula.

[0037] This application is equivalent to creating an independent storage area on existing equipment. In the prior art, the steam generator and alkali tank are connected to the inlet pipe 304 through a pipeline. During subsequent distillation, alkali and steam are added to the corresponding digestion tubes to complete the corresponding operations. Then, the liquid is sent to the condensation recovery and titration stage through the outlet pipe 303. This application provides the digestion solution with completed digestion solution to the Kjeldahl nitrogen analyzer by batch processing the digestion rack, reducing the assembly of digestion solution and improving the detection efficiency of the measurement process. The subsequent distillation, condensation recovery, titration, etc. are all prior art and will not be described in detail here. An outer cover plate 120 is provided on the outside of the assembly cavity 101 to close the assembly cavity 101. A limiting frame 130 and a card seat 140 are provided inside the assembly cavity 101 to limit the digestion module. The card seat 140 is engaged with both sides of the base 210. The limiting frame 130 is provided with a limiting inclined surface that is adapted to the shape of the base 210. After the base 210 abuts against the limiting frame 130, the limiting rod 150 is assembled in the assembly cavity 101 and restricts the sliding of the base 210. The exhaust pipe 302 is arranged on one side of the return pipe 322, while the liquid outlet pipe 303 and the liquid inlet pipe 304 are arranged on one side of the return pipe 322. The liquid outlet pipe 303 and the liquid inlet pipe 304 extend into a sliding seat 330, which is connected to the conduit module 500. The ends of the liquid outlet pipe 303 and the liquid inlet pipe 304 are inserted into the corresponding pipes. Specifically, the limiting rod 150 is fixed to the bearing surface of the assembly cavity 101 with bolts, and the top surface of the assembly cavity 101 is provided with a spring locking tongue 160. The digestion module is fixedly assembled with the assembly cavity 101 by horizontal pushing. The top surface of the assembly cavity 101 is also provided with a slot. The outer cover plate 120 is inserted into the slot and then assembled to the side of the assembly cavity 101 with bolts. The side of the assembly cavity 101 away from the slot is provided with a notch to facilitate the assembly of the outer cover plate 120.

[0038] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0039] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A batch processing digestion rack for a Kjeldahl nitrogen analyzer, characterized in that, include: A base unit, the base unit including a base platform and a guide plate disposed perpendicular to the base platform, the base platform being provided with an annular recessed embedding groove; The reaction fitting includes several sets of reaction tubes, branch tubes, and a sliding seat wrapped around the outside of the branch tubes. The sliding seat slides on a guide plate. The guide plate is provided with a support module for supporting the reaction tubes. The reaction tubes are placed on the support module, and the bottom of the reaction tubes extends into the embedding groove. The conduit module has a branch pipe inserted into the reaction tube. The branch pipe is also equipped with an exhaust pipe, a liquid outlet pipe, and a liquid inlet pipe. During the digestion process, the acid gas is sent out of the digestion rack through the exhaust pipe. The solution in the reaction tube is distilled and then introduced into the conduit module through the liquid outlet pipe and sent away from the digestion rack.

2. The batch processing digestion rack for a Kjeldahl nitrogen analyzer as described in claim 1, characterized in that, The branch pipe includes a collecting pipe and a return pipe. A heating ring for heating is provided on the outside of the collecting pipe, and a condenser is provided on the outside of the return pipe. The exhaust pipe, liquid outlet pipe and liquid inlet pipe are all located on the side wall of the return pipe.

3. The batch processing digestion rack for a Kjeldahl nitrogen analyzer as described in claim 2, characterized in that, The base is equipped with a heating plate located at the bottom of the embedding groove. After the end of the reaction tube extends into the embedding groove, the heat generated by the heating plate is transferred to the reaction tube through the embedding groove.

4. The batch processing digestion rack for a Kjeldahl nitrogen analyzer as described in claim 3, characterized in that, The support module includes a semi-support ring and a retaining ring disposed near the embedding groove. The semi-support ring has a semi-open structure, the top of the reaction tube has a rolled end structure, the reaction tube is engaged with the semi-support ring, and the end of the reaction tube extends into the embedding groove after passing through the retaining ring.

5. The batch processing digestion rack for a Kjeldahl nitrogen analyzer as described in claim 4, characterized in that, The diameter of the reflux pipe is smaller than that of the collection pipe, and the reflux pipe and the collection pipe are connected by a reducer. During the digestion process, the acid gas refluxes back to the collection pipe under the condensation effect in the reflux pipe.

6. The batch processing digestion rack for a Kjeldahl nitrogen analyzer as described in claim 5, characterized in that, The catheter module has two sets of pipeline systems inside. The pipeline system includes a main pipe and a connecting pipe that communicates with the main pipe. The connecting pipe communicates with the outside of the catheter module. The outlet pipe and the inlet pipe are respectively connected to the connecting pipes in different pipeline systems.

7. A batch processing digestion rack for a Kjeldahl nitrogen analyzer as described in claim 6, characterized in that, The exhaust pipe is equipped with a pressure relief safety valve.

8. A Kjeldahl nitrogen analyzer comprising a batch processing digestion rack as described in claim 7, characterized in that, The Kjeldahl nitrogen analyzer has an assembly cavity on its side wall to accommodate the batch processing digestion rack of the Kjeldahl nitrogen analyzer. The conduit module is set in the assembly cavity. After the reaction tube and the base unit are assembled to form a digestion module, they are pushed into the assembly cavity. The digestion module and the conduit module are connected and connected.

9. A Kjeldahl nitrogen analyzer as described in claim 8, characterized in that, The assembly cavity is provided with a limiting frame and a limiting rod for limiting the digestion module. The limiting frame is provided with a limiting inclined surface adapted to the base. After the base abuts against the limiting frame, the limiting rod is assembled in the assembly cavity and limits the sliding of the base.

10. A Kjeldahl nitrogen analyzer as described in claim 9, characterized in that, The assembly cavity is equipped with a purification pipe for recovering acid gas, and an outer cover plate is provided on the outside of the assembly cavity to seal the assembly cavity. The assembly cavity is isolated from the outside world through the outer cover plate. The flue gas generated during the digestion process is discharged from the assembly cavity by the purification pipe through negative pressure.

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