Cleaning test device for heat exchange tube of direct-current evaporator

Abstract

The invention discloses a direct-current evaporator heat exchange tube cleaning test device in the technical field of heat exchange tube cleaning, which comprises a supporting assembly, a clamping assembly, a first flange, a second flange and a heat exchange tube connected with the first flange and the second flange, and an inner insert is inserted into the heat exchange tube. The clamping assembly has the beneficial effects that through the split structure of the inner inserting piece, the throttling valve can be rapidly taken out, the throttling hole can be dredged, the situation that the heat exchange function of the heat exchange pipe is affected due to sediment accumulation is avoided, the clamping assembly is simple in structure and convenient and fast to install, and the efficiency of the heat exchange pipe cleaning test is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange tube cleaning, in particular to a direct current evaporator heat exchange tube cleaning test device. Background Art

[0002] In recent years, the fourth generation of reactors (high temperature gas-cooled reactors, fast reactors, etc.) have been built and put into operation in my country. This type of reactor unit generally uses a direct current evaporator, and a stainless steel or nickel-based alloy throttling component is installed at the inlet of the evaporator to prevent erosion. At present, the feed water treatment method of adding ammonia and reducing agent to the feed water is adopted on the tube side of this type of evaporator. According to the operating experience of direct current boilers in thermal power plants, units using this water treatment method are prone to scale deposition and blockage in the throttling holes. In addition, as the operating time of the direct current evaporator increases, iron oxide will be deposited in the heat exchange tube. These deposits not only affect the heat exchange of the heat exchange tube, but also have the risk of causing under-scale corrosion of the heat exchange tube.

[0003] Chemical cleaning is one of the effective ways to remove scale from heat exchange tubes. Before chemical cleaning is implemented, it is necessary to carry out targeted chemical cleaning tests and develop cleaning process formulas. Evaporators are extremely important for nuclear power plants, so the control of material corrosion during the cleaning process is even more important. Not only should the corrosion of individual materials be controlled, but also attention should be paid to the galvanic effect of different materials, especially the contact parts between the inner plug-in and the heat exchange tube. Therefore, it is necessary to design galvanic corrosion control measures during process development. Whether the galvanic corrosion control measures are effective needs to be determined through cleaning tests. Since the connection method between the inner plug-in and the heat exchange tube of the direct current evaporator is a direct plug-in method, how to design tooling to meet the sealing requirements and ultimately achieve the connection method between the inner plug-in and the heat exchange tube consistent with the actual situation, there are certain technical difficulties. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is how to achieve rapid cleaning of the heat exchange tubes.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a direct current evaporator heat exchange tube cleaning test device, comprising a clamping assembly, including a first flange, a second flange and a heat exchange tube connected to the first flange and the second flange, and an inner plug-in is inserted into the heat exchange tube.

[0008] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, wherein: the first flange is provided with a containing groove.

[0009] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, the first flange is provided with a boss, the boss is provided with a connecting hole, the inner wall of the connecting hole is provided with a first internal thread, and the accommodating groove is connected to the connecting hole.

[0010] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, wherein: a second internal thread is provided at the bottom of the accommodating groove, and the second internal thread cooperates with the fastening bolt.

[0011] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, wherein: the second flange is provided with a second connecting hole, and a third internal thread is provided in the second connecting hole.

[0012] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device described in the present invention, wherein: a first external thread is provided at one end of the heat exchange tube, a second external thread is provided at the other end of the heat exchange tube, a heat exchange channel is provided inside the heat exchange tube, and the heat exchange channel is provided with an expansion hole at one end of the first external thread.

[0013] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, wherein: the first external thread cooperates with the first internal thread to realize the threaded connection between the first flange and the heat exchange tube, and the second external thread cooperates with the third internal thread to realize the threaded connection between the second flange and the heat exchange tube.

[0014] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, the internal plug-in includes a throttle valve connecting pipe and a throttle valve.

[0015] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device described in the present invention, one end of the throttle valve connecting pipe is provided with a groove, and the other end of the throttle valve connecting pipe is provided with a guide pipe, the guide pipe is inserted into the expansion hole, and the guide pipe is connected to the groove.

[0016] As a preferred solution of the direct current evaporator heat exchange tube cleaning test device of the present invention, the throttle valve is placed in the groove, the throttle valve is provided with a throttle channel, and the throttle valve is provided with a throttle hole.

[0017] The beneficial effects of the present invention are as follows: through the split structure of the internal plug-in, the throttle valve can be quickly removed to complete the dredging of the throttle hole, thereby avoiding the accumulation of sediments and affecting the heat exchange function of the heat exchange tube, and the clamping component has a simple structure and is easy to install, which effectively improves the efficiency of the heat exchange tube cleaning test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 A schematic diagram of the structure of a direct current evaporator heat exchange tube cleaning test device according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a half-section structure of a clamping assembly according to an embodiment of the present invention;

[0021] Figure 3 A schematic cross-sectional structure diagram of an internal plug-in according to an embodiment of the present invention;

[0022] Figure 4 A schematic cross-sectional structure diagram of a clamping assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1

[0028] Reference Figure 1-4The present embodiment provides a direct current evaporator heat exchange tube cleaning test device, including a clamping assembly 100, including a first flange 101, a second flange 102 and a heat exchange tube 103 connected to the first flange 101 and the second flange 102, and an inner plug 104 is inserted into the heat exchange tube 103.

[0029] The first flange 101 and the second flange 102 are connected to the two ends of the heat exchange tube 103 respectively, and the heat exchange tube 103 can be fixed to keep the heat exchange tube 103 stable during heat exchange. Afterwards, the first flange 101 and the second flange 102 will be connected to the flange on the external cleaning test bench. The cleaning test bench is provided with a cleaning pump. When the heat exchange tube 103 is fixed on the cleaning test bench, the cleaning medium will flow into the heat exchange tube 103 under the action of the cleaning pump to complete the cleaning of the heat exchange tube 103. Finally, the cleaning medium will flow out of the heat exchange tube through the internal plug-in 104.

[0030] During the cleaning test of the heat exchange tube 103, while ensuring that the connection between the inner plug 104 and the heat exchange tube 103 is sufficiently sealed, the inner plug 104 must be quickly disassembled and assembled to clean the sediment in the inner plug 104 in time to ensure heat exchange efficiency.

[0031] Example 2

[0032] Reference Figure 2-3 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment and is different from the previous embodiment in that: the first flange 101 is provided with a receiving groove 101a; the first flange 101 is provided with a boss 101b, the boss 101b is provided with a connecting hole 101b-1, the inner wall of the connecting hole 101b-1 is provided with a first internal thread 101b-2, and the receiving groove 101a is connected to the connecting hole 101b-1; the bottom of the receiving groove 101a is provided with a second internal thread 101a-1, and the second internal thread 101a-1 is matched with the fastening bolt 101c; the second flange 102 is provided with a second connecting hole 102a, and the second connecting hole 102a is provided with a second internal thread 101b-2. A third internal thread 102b is provided in the hole 102a; a first external thread 103a is provided at one end of the heat exchange tube 103, and a second external thread 103b is provided at the other end of the heat exchange tube 103; a heat exchange channel 103c is provided inside the heat exchange tube 103, and the heat exchange channel 103c is located at one end of the first external thread 103a and is provided with an expanded hole 103c-1; the first external thread 103a cooperates with the first internal thread 101b-2 to realize the threaded connection between the first flange 101 and the heat exchange tube 103, and the second external thread 103b cooperates with the second internal thread 101a-1 to realize the threaded connection between the second flange 102 and the heat exchange tube 103.

[0033] Specifically, the receiving groove 101 a is used to place the internal plug-in unit 104 , and the receiving groove 101 a is sealed by the fastening bolts 101 c , while also being able to fix the internal plug-in unit 104 .

[0034] Preferably, before the threaded connection is performed, polytetrafluoroethylene raw tape is wound around the external thread, which can improve the sealing performance of the connection between the heat exchange tube 103 and the flange and avoid leakage of the cleaning medium during the cleaning test.

[0035] Furthermore, the first flange 101, the second flange 102 and the fastening bolts 101c are all made of PPR plastic or other plastics, ensuring that the materials in contact with the inner plug-in 104 and the heat exchange tube 103 are all insulating materials to avoid galvanic corrosion of these materials, thereby affecting the results of the cleaning test.

[0036] Example 3

[0037] Reference Figure 4 , which is the third embodiment of the present invention, and provides a direct current evaporator heat exchange tube cleaning test device. This embodiment is based on the previous embodiment, and is different from the previous embodiment in that: the internal plug-in 104 includes a throttle valve connecting pipe 104a and a throttle valve 104b; a groove 104a-1 is provided at one end of the throttle valve connecting pipe 104a, and a guide pipe 104a-2 is provided at the other end of the throttle valve connecting pipe 104a, and the guide pipe 104a-2 is inserted into the expansion hole 103c-1, and the guide pipe 104a-2 is connected to the groove 104a-1; the throttle valve 104b is placed in the groove 104a-1, the throttle valve 104b is provided with a throttling channel 104b-1, and the throttle valve 104b is provided with a throttling hole 104b-2.

[0038] Specifically, the guide tube 104a-2 on the throttle valve connecting pipe 104a matches the diameter of the expansion hole 103c-1 on the heat exchange tube 103. When the guide tube 104a-2 is inserted into the expansion hole 103c-1, the throttle valve connecting pipe 104a can be fixed.

[0039] Preferably, under the action of the cleaning pump, the cleaning medium enters the heat exchange channel 103c in the heat exchange tube 103 from above, and the sediments attached to the inner wall of the heat exchange tube 103 are removed through chemical reaction, and the fallen sediments enter the guide tube 104a-2 along the heat exchange channel 103c. Due to the limitation of the throttle hole 104b, some sediments with larger volume cannot be discharged through the throttle hole 104b, and the sediments will accumulate in the groove 104a-1. At this time, in order to ensure the normal heat exchange of the heat exchange tube, it is taken out by rotating the fastening bolt 101c, and then the throttle valve 104b is pulled out to discharge the sediments, thereby completing the cleaning test of the heat exchange tube.

[0040] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0041] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0042] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A direct current evaporator heat exchange tube cleaning test device, characterized in that: include, The clamping assembly (100) comprises a first flange (101), a second flange (102), and a heat exchange tube (103) connected to the first flange (101) and the second flange (102), wherein an inner plug-in unit (104) is inserted into the heat exchange tube (103).

2. The direct current evaporator heat exchange tube cleaning test device according to claim 1, characterized in that: The first flange (101) is provided with a receiving groove (101a).

3. The direct current evaporator heat exchange tube cleaning test device according to claim 2, characterized in that: The first flange (101) is provided with a boss (101b), the boss (101b) is provided with a connecting hole (101b-1), the inner wall of the connecting hole (101b-1) is provided with a first internal thread (101b-2), and the accommodating groove (101a) is connected to the connecting hole (101b-1).

4. The direct current evaporator heat exchange tube cleaning test device according to claim 3, characterized in that: The bottom of the accommodating groove (101a) is provided with a second internal thread (101a-1), and the second internal thread (101a-1) cooperates with the fastening bolt (101c).

5. The direct current evaporator heat exchange tube cleaning test device according to claim 4, characterized in that: The second flange (102) is provided with a second connection hole (102a), and a third internal thread (102b) is provided in the second connection hole (102a).

6. The direct current evaporator heat exchange tube cleaning test device according to claim 5, characterized in that: A first external thread (103a) is provided at one end of the heat exchange tube (103), a second external thread (103b) is provided at the other end of the heat exchange tube (103), a heat exchange channel (103c) is provided inside the heat exchange tube (103), and an expansion hole (103c-1) is opened at one end of the heat exchange channel (103c) located at the first external thread (103a).

7. The direct current evaporator heat exchange tube cleaning test device according to claim 6, characterized in that: The first external thread (103a) cooperates with the first internal thread (101b-2) to realize the threaded connection between the first flange (101) and the heat exchange tube (103), and the second external thread (103b) cooperates with the third internal thread (102b) to realize the threaded connection between the second flange (102) and the heat exchange tube (103).

8. The direct current evaporator heat exchange tube cleaning test device according to claim 7, characterized in that: The inner plug-in unit (104) includes a throttle valve pipe (104a) and a throttle valve (104b).

9. The direct current evaporator heat exchange tube cleaning test device according to claim 8, characterized in that: A groove (104a-1) is provided at one end of the throttle valve connecting pipe (104a), and a flow guide tube (104a-2) is provided at the other end of the throttle valve connecting pipe (104a). The flow guide tube (104a-2) is inserted into the expansion hole (103c-1), and the flow guide tube (104a-2) is connected to the groove (104a-1).

10. The direct current evaporator heat exchange tube cleaning test device according to claim 9, characterized in that: The throttle valve (104b) is placed in the groove (104a-1), the throttle valve (104b) is provided with a throttle channel (104b-1), and the throttle valve (104b) is provided with a throttle hole (104b-2).

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