Special thermocouple for industrial torch

Abstract

In order to solve the problem that a thermocouple protection sleeve in the prior art is frequently damaged, the utility model provides a thermocouple special for an industrial torch. The special thermocouple for the industrial torch comprises a junction box, a thermocouple wire and a protective sleeve, the protective sleeve is sleeved on a measuring end of the thermocouple wire, and the thermocouple wire is connected with a wiring port of the junction box; the protective sleeve is made of hastelloy.

Description

Technical Field

[0001] The present application relates to the field of industrial torches, and in particular to a thermocouple dedicated to industrial torches. Background Art

[0002] In actual use, the applicant found that the thermocouple protection sleeves specially used in industrial torches were frequently damaged due to corrosion.

[0003] In order to find out the cause of the damage to the thermocouple protective sleeve, the applicant analyzed the components of the damaged thermocouple protective sleeve and found that as the degree of damage increased, the sulfur ion, oxygen ion and chloride ion components in the sample gradually increased. Combined with the environment in which the industrial torch-specific thermocouple is located, the applicant found that the root cause of the frequent damage to the thermocouple protective sleeve is: the industrial torch uses underground direct natural gas. After the underground direct natural gas is introduced into the industrial torch, the sulfur-containing substances and chlorine-containing substances in it react chemically under high temperature, and the resulting compounds adhere to the surface of the protective sleeve, thereby causing corrosion and damage to the protective sleeve. Summary of the invention

[0004] In order to solve the problem of frequent damage of thermocouple protective covers in the prior art, the present application provides a thermocouple dedicated to industrial torches.

[0005] The technical solution of this application is:

[0006] A thermocouple for industrial torches, comprising: a junction box, a protective cover and a thermocouple wire, wherein the protective cover is sleeved on the measuring end of the thermocouple wire, and the thermocouple wire is connected to the wiring port of the junction box;

[0007] The protective sleeve is made of Hastelloy.

[0008] Preferably, the protective cover is made of Hastelloy B2 alloy or Hastelloy B3 alloy.

[0009] Preferably, the industrial torch-specific thermocouple is a shell-connected thermocouple.

[0010] The beneficial effects of this application are:

[0011] By utilizing the higher proportion of molybdenum in Hastelloy alloy, the high molybdenum content can significantly improve the corrosion resistance of the alloy, especially in terms of resistance to oxidizing and non-oxidizing acid corrosion; the high molybdenum content in Hastelloy alloy can form a protective oxide film, which effectively prevents direct contact between chloride ions and the metal matrix, thereby preventing embrittlement caused by chlorine-containing substances in underground direct natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a schematic diagram of the structure of a thermocouple dedicated to industrial torches in an embodiment of the present application. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0014] In order to find the cause of the damage to the thermocouple protective cover, the applicant analyzed the components of the damaged thermocouple protective cover. According to the severity of the damage, the applicant divided the damaged thermocouple protective cover into 4 test samples, among which, sample 1 corresponding to test result 1 was completely undamaged, and the degree of damage of samples 2, 3, and 4 corresponding to test results 2, 3, and 4 increased successively, as shown in Table 1 below.

[0015]

[0016] Table 1

[0017] After testing, it was found that as the degree of damage increased, the sulfur, oxygen and chlorine content in samples 1-4 gradually increased. Those skilled in the art know that sulfur-containing substances can corrode metal structures; in addition, under high temperature conditions, chlorine atoms can react chemically with metal atoms, resulting in the destruction of metal structures and brittleness, that is, embrittlement of the thermocouple protective sleeve.

[0018] Since the current thermocouple protection cover is made of GH3039 high temperature alloy, its composition should not contain sulfur and chlorine. However, the sulfur and chlorine in samples 2-4 gradually increased. Therefore, the applicant thought that the environment in which the protection cover was located contained these two components. Therefore, the applicant further analyzed the composition of the raw gas introduced into the industrial torch, as shown in Table 2 below.

[0019]

[0020] Table 2

[0021] As can be seen from Table 2, the analysis found that the raw gas contained a high concentration of hydrogen sulfide, but no chlorine component was detected. Since the raw gas was collected directly from underground, the components contained in the raw gas collected at different times would be different. Therefore, the applicant believes that the chloride ions in the sample still come from the raw gas.

[0022] Therefore, considering the environment in which the dedicated thermocouples for industrial torches are located, the applicant believes that the root cause of the frequent damage to the thermocouple protective cover is: the industrial torch uses underground direct-sourced natural gas. After the underground direct-sourced natural gas is introduced into the industrial torch, the sulfur-containing and chlorine-containing substances therein react chemically under the action of high temperature. The resulting compounds adhere to the surface of the protective cover, thereby causing corrosion and damage to the thermocouple protective cover.

[0023] In order to solve this problem, the applicant replaced a variety of materials for the thermocouple protective sleeves, for example: using gh3030 alloy, 316L alloy, Incoloy825 and other alloys to make thermocouple protective sleeves, but still found the aforementioned easy damage problem. After analysis, it was found that the molybdenum content in these materials was relatively low. For this reason, the applicant selected Hastelloy alloy with a higher molybdenum content to support the thermocouple protective sleeve, and found that it could solve the problem of frequent damage to the thermocouple protective sleeve.

[0024] To this end, an embodiment of the present application provides a thermocouple specifically for industrial torches, comprising: a junction box 1, a thermocouple wire 3 and a protective cover 2, wherein the protective cover 2 is sleeved on the measuring end of the thermocouple wire 3, and the thermocouple wire 3 is connected to the wiring port of the junction box 1; the protective cover 2 is made of Hastelloy.

[0025] In the embodiments of the present application, a relatively high proportion of molybdenum components in Hastelloy alloy is utilized, and the high molybdenum content can significantly improve the corrosion resistance of the alloy, especially in terms of resistance to oxidizing and non-oxidizing acid corrosion.

[0026] As a strengthening element of the alloy, molybdenum can significantly improve the strength and hardness of the alloy. In Hastelloy alloy, the addition of molybdenum can effectively improve the yield strength and tensile strength of the alloy through mechanisms such as solid solution strengthening and grain boundary strengthening. At the same time, molybdenum can also improve the ductility and toughness of the alloy, making it more stable when subjected to external impact or deformation.

[0027] The high molybdenum content in Hastelloy can form a protective oxide film, which effectively prevents direct contact between chloride ions and the metal matrix, thereby preventing embrittlement caused by chloride-containing substances in underground direct natural gas.

[0028] In the embodiment of the present application, the protective cover 2 is preferably made of HastelloyB2 alloy or HastelloyB3 alloy. Because when the molybdenum content in the protective cover 2 is higher than 15%, the corrosion resistance of the protective cover in oxidizing acid is also significantly increased, which further proves the important role of molybdenum in improving the corrosion resistance of the alloy; and the molybdenum content in the HastelloyB2 alloy is between 26-30%, and the molybdenum content in the Hastelloy B3 alloy is about 28.5%, which can significantly improve the corrosion resistance of the protective cover.

[0029] In addition, in the embodiment of the present application, the industrial torch dedicated thermocouple is a shell-connected thermocouple, and the protective cover 2 and the measuring end of the thermocouple wire 3 are processed by welding.

[0030] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0031] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0032] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0033] The technical solution provided by the utility model is described in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the utility model, and the content of this specification should not be understood as limiting the utility model. At the same time, for those skilled in the art, according to the utility model, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from them are still within the protection scope of the utility model.

Claims

1. A thermocouple for industrial torches, characterized in that: include: A junction box (1), a protective cover (2) and a thermocouple wire (3), wherein the protective cover (2) is sleeved on the measuring end of the thermocouple wire (3), and the thermocouple wire (3) is connected to a wiring port of the junction box (1); The protective sleeve (2) is made of Hastelloy.

2. The industrial torch special thermocouple according to claim 1, characterized in that: The protective sleeve (2) is made of Hastelloy B2 alloy or Hastelloy B3 alloy.

3. The industrial torch special thermocouple according to claim 1, characterized in that: The special thermocouple for industrial torch is a shell-connected thermocouple.

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