Quantitative standard sample tube for detecting oxide skin in austenitic stainless steel tube

Abstract

The utility model discloses a quantitative standard sample tube for detecting oxide skin in an austenitic stainless steel tube, which comprises a stainless steel tube, a plastic sleeve and a sealing plug, the plastic sleeve is arranged in the stainless steel tube, the sealing plug is arranged in the left end of the plastic sleeve, the stainless steel tube is made of austenitic stainless steel, the inner diameter of the stainless steel tube is the same as the outer diameter of the plastic sleeve, and the sealing plug is arranged in the left end of the plastic sleeve. The plastic sleeve is a stepped plastic sleeve, the right end of the plastic sleeve is sealed, the left end of the plastic sleeve is sealed by a sealing plug, the length of the plastic sleeve is equal to that of the stainless steel pipe, the outer diameter of the plastic sleeve is equal to the inner diameter of the stainless steel pipe, and the plastic sleeve is provided with nine steps for simulating oxide skins with different thicknesses; the sealing plug is made of plastic, the size of the outer edge of the sealing plug is larger than the diameter of the plastic sleeve, the sealing plug is convenient to take out, the structure is simple, operation is convenient, the thickness value of the oxide skin can be quantified, and good practicability and economic benefits are achieved.

Description

Technical Field

[0001] The utility model relates to a quantitative standard sample tube for oxide scale detection, in particular to a quantitative standard sample tube for oxide scale detection inside austenitic stainless steel tubes, belonging to the technical field of oxide scale detection. Background Technique

[0002] With the rapid development of China's power construction, thermal power units are gradually developing towards large capacity and high energy efficiency. The steam pressure and temperature during boiler operation are gradually increasing, and high-alloy pipes with stronger heat resistance are required. Therefore, austenitic stainless steel pipes are increasingly used in the manufacturing process of boilers. As the boiler operates, oxide scale will gradually form inside the stainless steel pipes of the boiler. The thermal expansion coefficients of the oxide scale and the stainless steel pipe matrix are quite different. During the startup and shutdown of the boiler, the oxide scale on the inner wall of the pipe is extremely easy to fall off. The accumulated oxide scale inside the pipe reduces the steam flow area and the heat transfer capacity of the pipe, making the heating surface pipes unable to be reliably cooled. In severe cases, it may lead to overheating and bursting of the pipes. Another small part of the fallen oxide scale enters the steam turbine side with the steam flow, which may cause the main steam valve to become stuck and sticky, as well as solid particle erosion of the steam turbine nozzles and blades, and damage the steam turbine blades in severe cases. After the fallen oxide scale enters the condensate water, it will cause the iron content to exceed the standard and result in waste of resources. The existing technology cannot detect oxide scales of different thicknesses, and the measurement accuracy cannot be guaranteed, which in turn leads to inaccurate life assessment and increases the maintenance cost. The stepped plastic sleeve of the utility model can simulate the thickness of the oxide scale inside the stainless steel pipe respectively.

[0003] How to measure the oxide scale on the inner wall of the high-temperature heating surface pipes during maintenance and monitor the situation of oxide scales of different thicknesses in a timely manner is a technical problem that needs to be solved urgently by those skilled in the art. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a quantitative standard sample tube for oxide scale detection, which can detect oxide scales of different thicknesses and monitor the situation of oxide scales of different thicknesses in a timely manner.

[0005] A quantitative standard sample tube for oxide scale detection inside an austenitic stainless steel pipe includes a stainless steel pipe, a plastic sleeve, and a sealing plug. The plastic sleeve is arranged inside the stainless steel pipe, and the sealing plug is arranged inside the left end of the plastic sleeve. The plastic sleeve is a stepped plastic sleeve, with a sealed right end and a sealed left end by the sealing plug. Its length is equal to the length of the stainless steel pipe, and its outer diameter is the same as the inner diameter of the stainless steel pipe. It is provided with nine steps, and each step is used to simulate oxide scales of different thicknesses.

[0006] The stainless steel pipe is made of austenitic stainless steel, with an inner diameter the same as the outer diameter of the plastic sleeve, and is arranged outside the plastic sleeve.

[0007] The size of the sealing plug is the same as the left-end diameter of the plastic sleeve. The material of the sealing plug is plastic. The size of the outer edge of the sealing plug is larger than the diameter of the plastic sleeve, which is convenient for taking out.

[0008] The total length of the plastic sleeve is the same as the length of the stainless steel pipe. The outer diameter is equal to the inner diameter of the austenitic stainless steel pipe. It is divided into 9 steps. Each step simulates oxide scales of different thicknesses. It can simulate oxide scale thickness values from 10% to 90% of the inner diameter size of the stainless steel pipe, so as to realize the quantification of the oxide scale thickness. The plastic sleeve is filled with powdered oxide scales. After being filled with oxide scale powder, the left end of the plastic sleeve is sealed with a sealing plug, and then the plastic sleeve is placed in the stainless steel pipe, which can simulate oxide scales of different thickness values, so as to realize the quantification of the oxide scale thickness value, and has good practicability and economic benefits.

[0009] The positive and beneficial effects of the present utility model are as follows:

[0010] 1. The present utility model is composed of a plastic sleeve, a stainless steel pipe, a sealing plug, etc. The structure is simple and easy to operate. It not only improves the efficiency of oxide scale detection, but also reduces the maintenance cost and resource waste by accurately detecting oxide scales of different thicknesses.

[0011] 2. The material of the plastic sleeve of the present utility model is plastic, which can be made from industrial waste, environmentally friendly and economical, avoiding resource waste. It is set as a stepped plastic sleeve, and each step simulates oxide scales of different thicknesses, so as to realize the quantification of the oxide scale thickness and timely monitor the situation of the oxide scales.

[0012] 3. The material of the sealing plug of the present utility model is plastic, which can be made from industrial waste, environmentally friendly and economical. The outer edge is larger than the left-end opening of the plastic sleeve, which is convenient for taking out the sealing plug and avoids the sealing plug falling into the plastic sleeve.

[0013] 4. The present utility model is convenient to install and quick to use, and has good practicability and economic benefits. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a schematic structural diagram of the stainless steel pipe of the present utility model;

[0016] Figure 3 is a schematic structural diagram of the plastic sleeve of the present utility model;

[0017] Figure 4 is a schematic structural diagram of the sealing plug of the present utility model;

[0018] Figure 5 is a left view of the present utility model.

[0019] In the figure: 1 - stainless steel tube, 2 - plastic sleeve, 3 - sealing plug. Detailed implementation mode

[0020] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Embodiment: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , a quantitative standard sample tube for detecting the internal oxide scale of austenitic stainless steel tubes, comprising a stainless steel tube 1, a plastic sleeve 2, and a sealing plug 3. The plastic sleeve 2 is arranged inside the stainless steel tube 1, and the sealing plug 3 is arranged inside the left end of the plastic sleeve 2. The plastic sleeve 2 is a stepped plastic sleeve, with a sealed right end and the left end sealed by the sealing plug 3. Its length is equal to that of the stainless steel tube 1, and its outer diameter is the same as the inner diameter of the stainless steel tube 1. It is provided with nine steps, and each step is used to simulate oxide scales of different thicknesses.

[0022] The stainless steel tube 1 is made of austenitic stainless steel, with an inner diameter the same as the outer diameter of the plastic sleeve 2, and is arranged outside the plastic sleeve 2.

[0023] The size of the sealing plug 3 is the same as the left end diameter of the plastic sleeve 2, and the material is plastic. The outer edge of the sealing plug 3 is larger than the diameter of the plastic sleeve 2, which is convenient for taking out.

[0024] The total length of the plastic sleeve 2 is the same as that of the stainless steel tube 1, and its outer diameter is equal to the inner diameter of the austenitic stainless steel tube. It is divided into 9 steps in total, and each step simulates oxide scales of different thicknesses. It can simulate the oxide scale thickness values from 10% to 90% of the inner diameter size of the stainless steel tube 1, so as to realize the quantification of the oxide scale thickness. After filling the plastic sleeve 2 with powdery oxide scale, the left end of the plastic sleeve 2 is sealed with the sealing plug 3, and then the plastic sleeve 2 is placed in the stainless steel tube 1, which can simulate oxide scales of different thickness values, thus realizing the quantification of the oxide scale thickness value, and having good practicability and economic benefits.

[0025] The utility model is composed of a plastic sleeve, a stainless steel pipe, a sealing plug, etc. It has a simple structure and is easy to operate. It not only improves the efficiency of scale detection, but also reduces the maintenance cost and resource waste by accurately detecting scales of different thicknesses. The plastic sleeve is made of plastic and can be made from industrial waste, which is environmentally friendly and economical, avoiding resource waste. It is set as a stepped plastic sleeve, and each step simulates scales of different thicknesses, thus realizing the quantification of scale thickness and timely monitoring the scale situation. The sealing plug is made of plastic and can be made from industrial waste, which is environmentally friendly and economical. The outer eaves are larger than the left end opening of the plastic sleeve, which is convenient for taking out the sealing plug and also avoids the sealing plug falling into the plastic sleeve. It is convenient to install and quick to use, and has good practicability and economic benefits.

[0026] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A quantitative standard tube for detecting oxide scale inside austenitic stainless steel tubes, characterized in that: The quantitative standard sample tube for detecting the internal oxide scale of austenitic stainless steel pipes includes a stainless steel pipe (1), a plastic sleeve (2), and a sealing plug (3). The plastic sleeve (2) is arranged inside the stainless steel pipe (1), and the sealing plug (3) is arranged inside the left end of the plastic sleeve (2). The plastic sleeve (2) is a stepped plastic sleeve, with a sealed right end and a sealed left end by the sealing plug (3). Its length is equal to that of the stainless steel pipe (1), and its outer diameter is the same as the inner diameter of the stainless steel pipe (1). It is provided with nine steps, and each step is used to simulate oxide scales of different thicknesses.

2. The quantitative standard tube for detecting the internal oxide scale of austenitic stainless steel pipes according to claim 1, wherein: The stainless steel pipe (1) is made of austenitic stainless steel, and its inner diameter is the same as the outer diameter of the plastic sleeve (2). It is arranged outside the plastic sleeve (2).

3. A quantitative standard tube for detecting internal oxide scale in austenitic stainless steel tubes according to claim 1, characterized in that: The size of the sealing plug (3) is the same as the left end diameter of the plastic sleeve (2), and its material is plastic. The size of the outer edge of the sealing plug (3) is larger than the diameter of the plastic sleeve (2), which is convenient for taking out.

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