Laboratory simulation device for under-scale corrosion of gas tube bundle

Abstract

The utility model discloses a gas tube bundle under-scale corrosion laboratory simulation device, which relates to the technical field of under-scale corrosion research, and comprises a reaction kettle, a fixing frame arranged at the bottom in the reaction kettle and used for fixing a plurality of experimental samples, a heat preservation heating device arranged outside the reaction kettle, and a sealing cover arranged at the top of the reaction kettle and used for sealing the reaction kettle, mounting holes for mounting the air inlet pipe, the air outlet pipe, the temperature detection device and the pressure monitoring device are formed in the sealing cover. According to the utility model, the reaction kettle with the fixed frame and the sealing cover on which the gas inlet pipe, the gas outlet pipe, the temperature detection device and the pressure monitoring device can be mounted are arranged, so that test samples of different materials, scales of different scale layers, different gases, temperatures, pressure environments and the like can be subjected to graded or combined experiments with different combination parameters; furthermore, parameters such as thicknesses, densities and medium concentrations of different scale layers in the tube bundle are combined and set, and the corrosion resistance of different tube bundle materials under different working conditions is analyzed more meticulously.

Description

Technical Field

[0001] The utility model relates to the technical field of under-scale corrosion research, in particular to a laboratory simulation device for under-scale corrosion of a gas pipe bundle. Background Art

[0002] The heat exchanger in the conversion section is an important heat exchange equipment in the production of synthetic ammonia. The corrosion problem of its heat exchange tubes has always troubled many synthetic ammonia companies. The tube bundle of this equipment generally has a short service life. Some heat exchange tubes leak and fail after only three months of use. The replacement of the heat exchanger is not only a loss of equipment cost, but the production stoppage caused by it has a greater impact on the economic benefits of the enterprise. Studies have shown that the serious under-deposition corrosion of the raw gas preheater in the conversion section causes problems such as blockage of the heat exchange tube bundle, thinning of the wall thickness, and corrosion perforation, which seriously affects the overall safe operation of the equipment.

[0003] Some extremely fine ash and ions carried in the raw gas will penetrate the filter element of the raw gas filter and enter the gas preheater. There are many insoluble and slightly soluble ash and ions in these ashes and ions. After these ashes and ions combine, they form accumulated dirt. The formation process of this scale will be very long. First, a small amount of ash and ions combine and adhere to the inner surface of the gas preheater tube bundle. As time goes on, more and larger ash and ion polymers continue to adhere and gather on it, slowly forming a scale layer. Although the air flow has a certain scouring effect on the scale layer, most of it will remain on the inner surface of the tube bundle. In the long run, the thickness of the scale layer on the inner surface of the gas preheater tube bundle will increase, and obvious scaling will occur, resulting in an increase in the resistance of the gas preheater tube bundle.

[0004] Therefore, it is of great practical significance to prevent and control corrosion economically and safely by using scientific and technological means. Among them, the observation and research of scaling and corrosion in the tube bundle under different temperature and pressure conditions is very important. However, due to the long implementation cycle of on-site hanging pieces, it is impossible to quickly and effectively analyze and study the thickness, density, medium concentration, etc. of different scale layers in the tube bundle, and it is impossible to analyze the corrosion resistance of different tube bundle materials under different working conditions in a more detailed manner. Utility Model Content

[0005] The utility model aims to provide a laboratory simulation device for under-scale corrosion of a gas pipe bundle to solve the problems existing in the above-mentioned prior art, and can combine and set parameters such as different scale layer thickness, density, medium concentration, etc. in the pipe bundle, so as to more carefully analyze the corrosion resistance of different pipe bundle materials under different working conditions.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] A laboratory simulation device for under-deposit corrosion of a gas pipeline bundle, comprising a reaction kettle, wherein a fixing rack for fixing a plurality of experimental samples is arranged at the inner bottom of the reaction kettle, a heat preservation and heating device is arranged outside the reaction kettle, a sealing cover for sealing the reaction kettle is arranged at the top of the reaction kettle, and mounting holes for installing an air inlet pipe, an air outlet pipe, a temperature detection device and a pressure monitoring device are formed in the sealing cover.

[0008] Preferably, an insulating lining is arranged on the inner wall of the reaction kettle.

[0009] Preferably, the insulating lining and the fixing rack together form an isolation layer for isolating scale deposits, reaction gases from the inner wall of the reaction kettle.

[0010] Preferably, both the insulating lining and the fixing rack are made of ceramic materials.

[0011] Preferably, the heat preservation and heating device comprises a heat preservation layer wrapped on the outer wall of the reaction kettle and heating resistance wires wound on the outer wall of the reaction kettle, and the heating resistance wires are electrically connected to the temperature detection device.

[0012] Preferably, a flange protruding outward is arranged at the top of the reaction kettle, and the reaction kettle is tightly connected to the sealing cover through the flange; a sealing groove for installing a sealing ring is formed on the upper surface of the flange and / or the lower surface of the sealing cover.

[0013] Preferably, a pressure regulating valve is arranged on the air inlet pipe and / or the air outlet pipe, and the pressure regulating valve is electrically connected to the pressure monitoring device.

[0014] Preferably, the fixing rack is provided with isolation chambers for separating a plurality of the experimental samples and placing different scale deposits.

[0015] Preferably, the isolation chambers and the fixing rack are integrally arranged.

[0016] Preferably, the isolation chambers and the fixing rack are separately arranged.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] By arranging a reaction kettle with a fixing rack and a sealing cover capable of installing an air inlet pipe, an air outlet pipe, a temperature detection device and a pressure monitoring device, different combinations of parameters of test samples of different materials, scale deposits of different scale layers, different gases, temperatures, pressure environments, etc. can be subjected to separate or combined experiments, so as to realize the combined setting of parameters such as different scale layer thicknesses, densities, medium concentrations, etc. in the pipeline bundle, and more detailed analysis of the corrosion resistance of different pipeline bundle materials under different working conditions.

[0019] Other technical solutions disclosed by the utility model also have the following technical advantages:

[0020] By setting isolation chambers for separating multiple said experimental samples and placing different scale deposits, bundles of different materials and scale deposits of different scale layers can be placed in different isolation chambers, enabling experiments with different parameter combinations to be carried out simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a schematic structural diagram of a laboratory simulation device for under-deposit corrosion of a gas pipeline bundle disclosed by the present invention;

[0023] Figure 2 is Figure 1 a cross-sectional view of;

[0024] Among them, 1. Sealing cover; 2. Mounting hole; 3. Flange; 4. Reactor; 5. Insulating lining; 6. Fixed frame; 7. Bottom plate; 8. Sample placement groove; 9. Experimental sample; 10. Thermal insulation layer; 11. Heating resistance wire; 12. Isolation chamber; 13. Thermal insulation heating device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] It should be noted that the structures, proportions, sizes, etc. depicted in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of this utility model. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that this utility model can generate and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in this utility model. In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing this utility model, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to this utility model. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0027] It should also be noted that in the embodiments of this application, the same reference numeral is used to represent the same component or the same part.

[0028] The purpose of this utility model is to provide a laboratory simulation device for under-deposit corrosion of a gas pipeline bundle to solve the problems existing in the prior art. It can combine and set parameters such as different scale layer thicknesses, densities, and medium concentrations inside the bundle, and more carefully analyze the corrosion resistance of different pipeline bundle materials under different working conditions.

[0029] To make the above objects, features, and advantages of this utility model more obvious and understandable, the following further detailed description of this utility model will be given in conjunction with the attached drawings and specific embodiments.

[0030] Please refer to Figures 1 to 2 , this embodiment provides a laboratory simulation device for under-deposit corrosion of a gas pipeline bundle, including a reaction kettle 4. A fixing rack 6 for fixing a plurality of experimental samples 9 is arranged at the inner bottom of the reaction kettle 4. A heat preservation and heating device 13 is arranged outside the reaction kettle 4. A sealing cover 1 for sealing the reaction kettle 4 is arranged at the top of the reaction kettle 4. Installation holes 2 for installing an inlet pipe, an outlet pipe, a temperature detection device, and a pressure monitoring device are opened on the sealing cover 1.

[0031] Specifically, a flange 3 protruding outward is provided at the top of the reaction kettle 4. The reaction kettle 4 is fixedly connected to the sealing cover 1 through the flange 3. There are various specific fastening connection methods, such as threaded connection, snap connection, and any other existing connection methods that can achieve the same function. A sealing groove for installing a sealing ring is provided on the upper surface of the flange 3 and / or the lower surface of the sealing cover 1 to ensure the sealing performance inside the reaction kettle 4.

[0032] The fixing rack 6 includes a bottom plate 7, and a sample placement groove 8 is provided on the bottom plate 7.

[0033] As a preferred solution of this embodiment, the fixing rack 6 is further provided with a partition chamber 12 for separating multiple experimental samples 9 and placing different scale deposits. An opening communicating with the internal space of the reaction kettle 4 is provided above the partition chamber 12. The partition chamber 12 and the fixing rack 6 can be integrally formed. For example, a partition chamber 12 with a depth greater than the size of the experimental sample 9 is directly processed on the bottom plate 7 with sufficient thickness, and then a sample placement groove 8 is processed at the bottom of the partition chamber 12; or a separated setting can also be adopted, such as installing a partition board around the sample placement groove 8.

[0034] An insulating lining 5 is provided on the inner wall of the reaction kettle 4. The insulating lining 5 and the fixing rack 6 together form an isolation layer that isolates scale deposits, reaction gases from the inner wall of the reaction kettle 4, and is used to protect the inner wall of the reaction kettle 4 from corrosion by reactants. Both the insulating lining 5 and the fixing rack 6 are made of corrosion-resistant insulating materials. In this embodiment, ceramic materials are preferably used, and other materials that can achieve the same function in the prior art can also be used.

[0035] The heat preservation and heating device 13 includes a heat preservation layer 10 wrapped around the outer wall of the reaction kettle 4 and heating resistance wires 11 wound around the outer wall of the reaction kettle 4. The heating resistance wires 11 are electrically connected to the temperature detection device. A pressure regulating valve is provided on the inlet pipe and / or the outlet pipe, and the pressure regulating valve is electrically connected to the pressure monitoring device.

[0036] In this embodiment, the temperature inside the reaction kettle 4 is maintained and controlled by the heat preservation and heating device 13 and the temperature detection device, and the pressure is maintained and controlled by the amount of reaction gas introduced into the reaction kettle 4 and the pressure regulating valve.

[0037] The steps for conducting experiments using this embodiment are as follows:

[0038] 1. Perform surface treatment, weighing, and area calculation on the experimental sample 9;

[0039] 2. Place the experimental samples 9 of the same or different materials in the sample placement groove 8;

[0040] 3. Add scale deposits with different or the same scale layers into the partition chamber 12;

[0041] 4. Cover the sealing cover 1 with the intake pipe, exhaust pipe, temperature detection device and pressure monitoring device installed, and introduce the reaction gas.

[0042] 5. Turn on the heat preservation heating device 13.

[0043] 6. Adjust the temperature value and pressure value according to the experimental requirements.

[0044] 7. React for the required time of the experiment under the corresponding parameter combination conditions.

[0045] 8. After reaching the required time of the experiment, take out the experimental sample 9, remove the surface corrosion products and then weigh it, calculate the weight loss of the sample before and after the experiment, and calculate the corrosion rate.

[0046] 9. Analyze the corrosion products and morphology of the parallel experimental samples 9 carried out during the same period.

[0047] In this embodiment, by setting the reaction kettle 4 with the fixing frame 6 and the sealing cover 1 that can install the intake pipe, exhaust pipe, temperature detection device and pressure monitoring device, it is possible to conduct separate or combined experiments with different combination parameters for test samples of different materials, scale deposits of different scale layers, and different gas, temperature, and pressure environments, etc., so as to realize the combined setting of parameters such as different scale layer thicknesses, densities, and medium concentrations in the tube bundle, and more carefully analyze the corrosion resistance of different tube bundle materials under different working conditions.

[0048] In addition, by setting the isolation chamber 12 for separating multiple said experimental samples 9 and placing different scale deposits, different tube bundles of different materials and scale deposits of different scale layers can be placed in different isolation chambers 12, so that experiments with different parameter combinations can be carried out simultaneously.

[0049] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0050] If the present utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, using bolts or screws for connection), or it can be understood as: an inseparable fixed connection (for example, riveting, welding). Of course, the mutually fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming using casting technology) (except when it is obviously impossible to adopt the integral forming process).

[0051] In addition, unless otherwise stated, the terms used to represent positional relationships or shapes in any of the above-disclosed technical solutions of the present utility model include states or shapes that are approximate, similar, or close thereto.

[0052] Any component provided by the present utility model can either be assembled from a plurality of individual components or be a single component manufactured by an integral forming process.

[0053] Adaptations made according to actual requirements are all within the protection scope of the present utility model.

[0054] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0055] Specific examples are used in the present utility model to elaborate on the principles and implementation manners of the present utility model. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A laboratory simulation device for under-scale corrosion of gas pipe bundles, characterized by: The reactor comprises a reactor, wherein a fixing frame for fixing a plurality of experimental samples is arranged at the bottom of the reactor, a heat preservation and heating device is arranged outside the reactor, a sealing cover for sealing the reactor is arranged on the top of the reactor, and mounting holes for mounting an air inlet pipe, an air outlet pipe, a temperature detection device and a pressure monitoring device are opened on the sealing cover.

2. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 1 is characterized in that: The inner wall of the reactor is provided with an insulating lining.

3. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 2 is characterized in that: The insulating lining and the fixing frame together form an isolation layer that isolates scale, reaction gas and the inner wall of the reactor.

4. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 3 is characterized in that: The insulating lining and the fixing frame are both made of ceramic material.

5. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 1 is characterized in that: The heat preservation and heating device comprises a heat preservation layer wrapped on the outer wall of the reaction kettle and a heating resistance wire wound on the outer wall of the reaction kettle, and the heating resistance wire is electrically connected to the temperature detection device.

6. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 1 is characterized by: The top of the reactor is provided with an outwardly protruding flange, and the reactor is fastened to the sealing cover via the flange; a sealing groove for installing a sealing ring is provided on the upper surface of the flange and / or the lower surface of the sealing cover.

7. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 1 is characterized by: The air inlet pipe and / or the air outlet pipe is provided with a pressure regulating valve, and the pressure regulating valve is electrically connected to the pressure monitoring device.

8. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to any one of claims 1 to 7, characterized in that: The fixing frame is provided with an isolation chamber for separating a plurality of the experimental samples and placing different scales.

9. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 8 is characterized in that: The isolation chamber and the fixing frame are arranged in an integrated manner.

10. The laboratory simulation device for under-scale corrosion of gas pipe bundles according to claim 8, characterized in that: The isolation chamber and the fixing frame are separately arranged.

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