Heat treatment device for pipe and pipe plate of heat exchanger

Abstract

The utility model discloses a heat exchanger tube and tube plate heat treatment device which comprises a heating machine box, a containing cavity is formed in the heating machine box, a heat exchanger tube plate is placed in the containing cavity, a circulating fan is arranged at the top of the containing cavity, and a plurality of heaters are installed in the inner wall of the containing cavity. A plurality of temperature thermocouples are installed on the side wall of the containing cavity and make contact with the weld joints of tubes of the heat exchanger tube plate and the tube plate. The heat exchanger is mainly used for occasions where heat exchange tubes and tube plates in the heat exchanger need local heat treatment, the whole tube plate face is heated evenly, the heat preservation effect is good, it is guaranteed that heat treatment is reliable and effective, the purpose of completely eliminating stress is achieved, and the working condition requirements of heat exchanger tube heads are met.

Description

Technical Field

[0001] The present application relates to a heat exchanger, and in particular to a heat treatment device for tubes and tube sheets of a heat exchanger. Background Art

[0002] Heat exchangers are widely used in petroleum, refining and other industries, and they occupy a very important position in industrial production. The welding of heat exchange tubes and tube sheets in heat exchangers is an important link, and the quality of welding directly determines the service life of the equipment. Because some heat exchanger media have a tendency to stress corrosion, the medium contains wet H2S, or the medium is extremely or highly toxic, etc., under such working conditions, the tubes and tube sheets of the heat exchanger need to be subjected to stress relief heat treatment after being burned. In addition, in order to reduce the hardness of the weld at the tube head, the welds between the heat exchanger tubes and the tube sheets also need to be subjected to stress relief heat treatment. The effect of heat treatment directly affects the reliable operation of the equipment. If it is not handled properly, the welds between the heat exchanger tubes and the tube sheets will crack, the equipment will leak, and the device will be shut down for repair, causing immeasurable losses. Traditional heat treatment equipment for heat exchanger tubes and tube sheets, such as Figure 1-2 As shown, only the LCD series crawler electric heating block is fixed on the tube sheet with a tooling to heat the weld between the tube and the tube sheet, and is wrapped with a thermal insulation cotton tooling. This heat treatment method has many disadvantages. The heater is inconvenient to fix, and it cannot ensure that the heating device is in full contact with the weld. The heating is uneven, and the temperature monitored by the temperature measuring thermocouple is uneven. It is impossible to determine whether the temperature meets the standard requirements. Due to the limitation of the shape of the heater, the entire tube sheet surface cannot be heated. The heating temperature at the edge of the tube sheet is not enough, the thermal insulation tooling cannot be closed, and the temperature drops rapidly after the electric heater stops heating. Therefore, traditional heat treatment equipment for heat exchanger tubes and tube sheets cannot guarantee the effectiveness of eliminating weld stress. Utility Model Content

[0003] The utility model aims to provide a heat exchanger tube and tube sheet heat treatment device, which is mainly used in the occasion where the heat exchange tubes and tube sheets in the heat exchanger need to be locally heat treated, so that the entire tube sheet surface is heated evenly, the thermal insulation effect is good, the heat treatment is guaranteed to be reliable and effective, the purpose of completely eliminating stress is achieved, and the working condition requirements of the heat exchanger tube head are met.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0005] An embodiment of the present application discloses a heat treatment device for tubes and tube sheets of a heat exchanger, comprising a heating chassis, wherein a receiving cavity is formed inside the heating chassis, and a heat exchanger tube sheet is placed in the receiving cavity. A circulating fan is arranged on the top of the receiving cavity, and a plurality of heaters are installed inside the inner wall of the receiving cavity. A plurality of temperature measuring thermocouples are installed on the side wall of the receiving cavity, and the temperature measuring thermocouples are in contact with the welds between the tubes and the tube sheets of the heat exchanger tube sheets.

[0006] Preferably, in the above-mentioned heat exchanger tube and tube sheet heat treatment device, an insulation box is provided on one side of the heating box, and one end of the heat exchanger tube sheet protrudes and passes through the insulation box.

[0007] Preferably, in the above-mentioned heat exchanger tube and tube sheet heat treatment device, a temperature control panel is provided on the side wall of the heating cabinet outside the temperature measuring thermocouple.

[0008] Preferably, in the above-mentioned heat exchanger tube and tube sheet heat treatment device, the shells of the heating box and the insulation box are insulation structures.

[0009] Preferably, in the above-mentioned heat exchanger tube and tube sheet heat treatment device, the heating box and the insulation box are placed on the lifting platform at the same time.

[0010] Preferably, in the above-mentioned heat exchanger tube and tube sheet heat treatment device, moving wheels are provided at the bottom of the lifting platform.

[0011] Compared with the prior art, the utility model changes the traditional heat treatment device for heat exchange tubes and tube sheets, and designs and develops a new local heat treatment device for the weld between tubes and tube sheets. The device is equipped with temperature control and temperature measuring devices, and is equipped with a circulating fan to ensure uniform temperature throughout the heating and insulation process. The device is easy to operate and move. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 Shown is a schematic diagram of a heat treatment device for a tube sheet of a heat exchanger in the prior art;

[0014] Figure 2 The figure shows a side view of a heat treatment device for a tube sheet of a heat exchanger in the prior art;

[0015] Figure 3 Shown is a schematic diagram of a heat treatment device for a tube sheet of a heat exchanger in a specific embodiment of the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to describe the technical solutions in the embodiments of the utility model in detail. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Combination Figure 3 As shown, the heat exchanger tube sheet heat treatment device 100 includes a heating box 101, a receiving cavity 102 is formed inside the heating box 101, a heat exchanger tube sheet 200 is placed in the receiving cavity 102, a circulating fan 103 is arranged on the top of the receiving cavity 102, a plurality of heaters 104 are installed inside the inner wall of the receiving cavity 102, and a plurality of temperature measuring thermocouples 105 are installed on the side wall of the receiving cavity 102, and the temperature measuring thermocouples 105 are in contact with the weld between the tube and the tube sheet of the heat exchanger tube sheet 200. A heat preservation box 106 is arranged on one side of the heating box 101, and one end of the heat exchanger tube sheet 200 protrudes and passes through the heat preservation box 106. A temperature control panel 107 is arranged on the side wall of the heating box 101 on the outer side of the temperature measuring thermocouple 105. The shells of the heating box 101 and the heat preservation box 106 are heat preservation structures. The heating box 101 and the heat preservation box 106 are placed on a lifting platform 108 at the same time. A moving wheel 109 is provided at the bottom of the lifting platform.

[0020] In this technical solution, this device optimizes the traditional tube and tube sheet heat treatment device, integrates the heater and the insulation device, and distributes them on the inner wall of the entire circular device. When heat treating the weld between the tube and the tube sheet, the device is directly put on the tube sheet of the heat exchanger. There is no need to fix the heater and insulation cotton separately. The operation is convenient and quick. The top of the device is equipped with a circulating fan. During heat treatment, the circulating fan can be turned on to accelerate the circulation of hot air in the cavity to make the heat transfer uniform. Several temperature measuring thermocouples are set on the panel, which can directly contact the weld between the tube and the tube sheet, accurately measure the temperature of the weld in the four quadrants, and are connected to the temperature control device, which is directly displayed on the screen of the temperature control device. A thermal insulation device is added on the other side of the tube sheet to prevent heat loss and effectively ensure the normal progress of the heat treatment. The entire device is placed on a lifting platform and can be adjusted according to the diameter of the equipment. A movable pulley is provided at the bottom of the lifting platform for easy movement.

[0021] This device can conveniently and quickly perform local heat treatment on the welds between the heat exchanger tubes and tube sheets. The heating and insulation of the device are integrated and do not require fixed tooling. The configured top circulation fan can accelerate hot air convection and heat transfer to make the temperature uniform throughout the heat treatment process. The thermocouple device can directly contact the weld and be connected to the temperature control device to monitor the temperature at any time. The insulation device at the other end has a certain width to ensure that heat is not lost during the heat treatment process. The entire device is placed on a lifting platform and is not limited by the equipment diameter. The pulley under the platform is easy to move. This device is suitable for local heat treatment of heat exchanger tubes and tube sheets and can be promoted for use.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0023] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A heat exchanger tube sheet heat treatment device, characterized in that: It comprises a heating box, wherein a receiving cavity is formed inside the heating box, a heat exchanger tube sheet is placed in the receiving cavity, a circulating fan is arranged on the top of the receiving cavity, a plurality of heaters are installed inside the inner wall of the receiving cavity, a plurality of temperature measuring thermocouples are installed on the side wall of the receiving cavity, and the temperature measuring thermocouples are in contact with the welds between the tubes of the heat exchanger tube sheet and the tube sheet.

2. The heat exchanger tube sheet heat treatment device according to claim 1, characterized in that: A heat preservation box is arranged on one side of the heating box, and one end of the heat exchanger tube sheet protrudes and passes through the heat preservation box.

3. The heat exchanger tube sheet heat treatment device according to claim 1, characterized in that: A temperature control panel is arranged on the side wall of the heating box outside the temperature measuring thermocouple.

4. The heat exchanger tube sheet heat treatment device according to claim 2, characterized in that: The shells of the heating chassis and the heat-insulating chassis are heat-insulating structures.

5. The heat exchanger tube sheet heat treatment device according to claim 2, characterized in that: The heating cabinet and the heat-insulating cabinet are placed on the lifting platform at the same time.

6. The heat exchanger tube sheet heat treatment device according to claim 5, characterized in that: The bottom of the lifting platform is provided with moving wheels.

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