Hydrogen-cooled generator lead-out line cooling air path structure and cooling method

Abstract

The application relates to the technical field of generators, and particularly discloses a hydrogen-cooled generator lead-out line cooling air path structure and a cooling method, which comprises a copper bar external cooling assembly, a plurality of copper pipe internal cooling assemblies used in cooperation with the copper bar external cooling assembly, and a lead-out cover inner wall air duct connected with the copper pipe internal cooling assemblies; the copper pipe internal cooling assembly comprises a tubular annular lead-out line provided with an air inlet A and an air outlet A, and a lead-out assembly connected with one end of the tubular annular lead-out line; the lead-out assembly comprises a transition lead-out line assembly connected with the tubular annular lead-out line and provided with an air outlet B, a lead-out sleeve connected with one end of the transition lead-out line assembly and away from the tubular annular lead-out line, and an air inlet assembly arranged on the lead-out sleeve and communicated with the lead-out sleeve. The application can effectively shorten the air path, reduce the air temperature of the air outlet, reduce the amount of copper, solve the problem of excessively high temperature of the annular lead-out line and the lead-out line of a large-current full-hydrogen-cooled generator, and improve the reliability of the generator operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generators, in particular to a hydrogen-cooled generator lead-out line cooling air path structure and cooling method. BACKGROUND

[0002] In the prior art, there are two kinds of ventilation cooling air path structures:

[0003] One is a full copper bar annular lead-out line structure, which adopts an external cooling type ventilation cooling air path, that is, the entire lead-out line exchanges heat with the cooling medium hydrogen through the insulating surface, thereby achieving the goal of cooling the lead-out line. When designing the annular lead-out line, the cross section of the copper bar needs to be optimized, the copper bar current density needs to be reduced, and the influences of the skin effect of the copper bar, the lead-out line ring proximity effect, the insulating thickness of the copper bar surface, the heat dissipation area of the insulating surface, and the ventilation air volume of the lead-out line, etc. are comprehensively considered. The annular lead-out line is supported by an insulating support, the lead-out lines are wrapped with a pad and impregnated with felt to be tightly packed, and the lead-out lines are fixed by winding a binding rope, so as to ensure that the annular lead-out line and the pad do not loosen or displace, and the entire end part becomes a firm whole.

[0004] Another is a copper bar + copper pipe structure annular lead-out line structure, which mainly adopts internal cooling and auxiliary external cooling, and the lead-out sleeve internal cooling, and finally the copper pipe lead-out line and the lead-out line are combined to form a single parallel cooling air path structure: the structure is suitable for large-capacity units, the arrangement of the copper bar and the copper pipe can reduce the distance between the copper bar and the copper pipe, reduce the influences of the proximity effect and the skin effect, and reduce the loss, wherein the connecting line adopts a copper bar structure, the remaining tubular annular lead-out line and the transition lead-out line adopt a copper pipe structure, the copper pipe is bent from high-conductivity oxygen-free copper pipe, the surfaces of the copper bar and the copper pipe are wrapped with an insulating layer with a thickness of about 2-5 mm, and the lead-out part is an epoxy composite insulating sleeve.

[0005] However, with the further breakthrough of the full hydrogen-cooled unit capacity, on the one hand, the current flowing through the tubular annular lead-out line and the stator lead-out line further increases, the influences of the proximity effect and the skin effect further highlight, and the loss of the tubular annular lead-out line and the stator lead-out line sharply rises, and on the other hand, considering the increase of the pitch circle of the annular lead-out line, the length of the copper pipe annular lead-out line significantly increases, the problem of the long cooling air path of the annular lead-out line is increasingly prominent, the temperature of the copper pipe annular lead-out line is relatively high, and even the local temperature of the lead-out line ring at the air outlet exceeds the allowable temperature of the F insulating grade, so a new ventilation cooling air path needs to be adopted to solve the problem of the excessively high temperature rise of the lead-out line. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a hydrogen-cooled generator lead-out line cooling air path structure and cooling method.

[0007] The solution adopted by the present application to solve the technical problem is:

[0008] The application discloses a hydrogen-cooled generator lead-out line cooling air path structure.

[0009] The copper pipe inner cooling assembly comprises a tubular annular lead line provided with an air inlet A and an air outlet A, and a lead-out assembly connected with one end of the tubular annular lead line.

[0010] The lead-out assembly comprises a transition lead line assembly connected with the tubular annular lead line and provided with an air outlet B, a lead-out sleeve connected with one end of the transition lead line assembly away from the tubular annular lead line, and an air inlet assembly arranged on the lead-out sleeve and communicated with the lead-out sleeve; the air outlet B of the transition lead line assembly is communicated with the inner wall air duct of the lead-out cover.

[0011] In some possible implementation manners, the transition lead line assembly comprises an upper transition lead line connected with the tubular annular lead line and a lower transition lead line connected with one end of the upper transition lead line away from the tubular annular lead line.

[0012] In some possible implementation manners, the transition lead line assembly further comprises a support sleeve arranged between the upper transition lead line and the lower transition lead line; the air outlet B is arranged on the support sleeve and communicated with the inner wall air duct of the lead-out cover.

[0013] In some possible implementation manners, a hard connecting piece is arranged between the upper transition lead line and the tubular annular lead line, and the air inlet B is arranged on the hard connecting piece.

[0014] In some possible implementation manners, the air inlet assembly comprises an insulating air inlet pipe arranged horizontally and in a tee shape; the insulating air inlet pipe comprises an air inlet pipe with an axis arranged horizontally, and an insulating ventilation pipe connected with one end of the air inlet pipe and forming a T-shaped structure; the other end of the insulating ventilation pipe is connected with the lead-out sleeve.

[0015] In some possible implementation manners, the tubular annular lead line comprises a main line arranged in a circular arc shape and connected with one end of the lead-out assembly, and a lead-in line connected with one end of the main line away from the lead-out assembly; the air inlet A is arranged on the lead-in line; and the air outlet A is arranged on the main line.

[0016] In some possible implementation manners, an insulating air pipe is arranged on the air outlet A.

[0017] According to the cooling method of the hydrogen-cooled generator lead-out line cooling air path structure, the copper row outer cooling assembly is used for outer cooling, the cooling air path formed by the copper pipe inner cooling assembly is used for inner cooling, and the cooling is performed in a combination mode of outer cooling and inner cooling; the cooling air path comprises a lead line cooling parallel air path and a lead-out line cooling parallel air path.

[0018] In some possible embodiments, the inner cooling by adopting the lead cooling and parallel air passage is specifically as follows:

[0019] The cooling hydrogen enters the tubular annular lead from the air inlet A, flows through the formed air passage of the tubular annular lead, exchanges heat, and then reaches the air outlet A;

[0020] The cooling hydrogen enters the tubular annular lead from the air inlet B, flows through the air passage of the tubular annular lead, exchanges heat, and then reaches the air outlet A;

[0021] The hot hydrogen after heat exchange is combined into the air outlet A and is discharged to the low-pressure area, so as to realize the cooling of the annular lead.

[0022] In some possible embodiments, the inner cooling by adopting the outgoing line cooling and parallel air passage is specifically as follows:

[0023] The cooling hydrogen enters the upper transition lead from the air inlet B, enters the support sleeve after passing through the upper transition lead;

[0024] The cooling hydrogen enters the air inlet pipe, flows through the hollow structure of the insulating ventilation pipe, and sequentially passes through the outgoing line sleeve, the lower transition lead and the support sleeve;

[0025] The hot hydrogen after heat exchange is combined in the support sleeve, enters the air passage through the air outlet B, and then enters the low-pressure area.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] The present application can effectively shorten the air passage path, reduce the air outlet temperature, reduce the amount of copper, and solve the problem of high temperature of the annular lead and outgoing line of the large-current full-hydrogen-cooled generator, thereby improving the reliability of the generator operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 Fig. 1 is a structural schematic diagram of the present application;

[0029] Fig. 2 Fig. 3 is a connection relationship diagram of the tubular annular lead and the copper pipe inner cooling assembly in the present application;

[0030] Fig. 3 Fig. 4 is a connection relationship diagram of the outgoing line cover inner wall air passage and the copper pipe inner cooling assembly in the present application;

[0031] Wherein: 10, copper row external cooling assembly; 20, copper pipe internal cooling assembly; 1, tubular ring-shaped lead; 11, main line; 111, air outlet A; 12, incoming line; 121, air inlet A; 13, lead insulation air pipe; 2, outgoing line assembly; 21, transition lead assembly; 211, upper transition lead; 212, lower transition lead; 213, support sleeve; 2131, air outlet B; 214, hard connecting piece; 2141, air inlet B; 22, outgoing line sleeve; 23, air inlet assembly; 231, insulated ventilation pipe; 232, air inlet pipe. DETAILED DESCRIPTION

[0032] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in the present application do not represent any order, quantity or importance, but only distinguish different components. Similarly, "one" or "a" and the like do not represent a quantity limit, but represent the existence of at least one. In the implementation of the present application, the association relationship of the associated objects is described as "and / or", which means that there can be three relationships, for example, A and / or B can represent: A alone, A and B together, and B alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" is two or more. For example, multiple positioning columns refer to two or more positioning columns. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The present application will be described in detail below.

[0034] In one aspect:

[0035] As Figs. 1-3 shown:

[0036] A hydrogen-cooled generator lead outgoing line cooling air path structure, comprising a copper row external cooling assembly 10 for realizing external cooling heat exchange, a plurality of copper pipe internal cooling assemblies 20 used in cooperation with the copper row external cooling assembly 10 and realizing internal cooling heat exchange, and an outgoing line cover inner wall air duct 30 connected with the copper pipe internal cooling assembly 20; the outgoing line cover inner wall air duct 30 is in communication with a low-pressure area;

[0037] The copper row external cooling assembly 10 is the same as the copper row in the structure form of the existing technology copper row + copper pipe structure ring-shaped lead and outgoing line, which will not be described here;

[0038] The copper pipe inner cooling assembly 20 comprises a tubular annular lead wire 1 provided with an air inlet A121 and an air outlet A111, an outgoing line assembly 2 connected with one end of the tubular annular lead wire 1;

[0039] The outgoing line assembly 2 comprises a transition lead wire assembly 21 connected with the tubular annular lead wire 1 and provided with an air inlet B2141 and an air outlet B2131, an outgoing line sleeve 22 connected with one end of the transition lead wire assembly 21 away from the tubular annular lead wire 1, and an air inlet assembly 23 arranged on the outgoing line sleeve 22 and communicated with the outgoing line sleeve 22; the outlet B of the transition lead wire assembly 21 is communicated with the inner wall air duct 30 of the outgoing line cover.

[0040] When the tubular annular lead wire 1 is cooled and exchanged heat, part of the cooling hydrogen is transported into the tubular annular lead wire 1 through the air inlet A121, and another part of the cooling hydrogen enters the tubular annular lead wire 1 through the air inlet B2141 of the transition lead wire assembly 21 to exchange heat with the tubular annular lead wire 1, and the hot hydrogen after heat exchange enters the low pressure area through the lead wire insulation air pipe 13 from the air outlet A111;

[0041] When the outgoing line assembly 2 is cooled and exchanged heat, part of the cooling hydrogen enters the transition lead wire assembly 21 from the air inlet B2141, and another part of the cooling hydrogen enters the outgoing line sleeve 22 through the air inlet assembly 23, and then enters the transition lead wire assembly 21 to exchange heat with the transition lead wire assembly 21, and the hot hydrogen after heat exchange is discharged to the inner wall air duct 30 of the outgoing line cover through the air outlet B2131, and then enters the low pressure area;

[0042] In some possible embodiments, the transition lead wire assembly 21 comprises an upper transition lead wire 211 connected with the tubular annular lead wire 1, a lower transition lead wire 212 connected with one end of the upper transition lead wire 211 away from the tubular annular lead wire 1, and a support sleeve 213 arranged between the upper transition lead wire 211 and the lower transition lead wire 212; the air outlet B2131 is arranged on the support sleeve 213 and communicated with the inner wall air duct 30 of the outgoing line cover.

[0043] Further, the lower transition lead wire 212 and the upper transition lead wire 211 are connected in a soft manner; the two ends of the support sleeve 213 are respectively communicated with the lower transition lead wire 212 and the inner wall air duct 30 of the outgoing line cover;

[0044] The cooling hydrogen enters the upper transition lead wire 211 from one end of the upper transition lead wire 211 close to the tubular annular lead wire 1, exchanges heat with the upper transition lead wire 211, and is discharged to the inner wall air duct 30 of the outgoing line cover through the air outlet B2131, and is transported to the low pressure area through the inner wall air duct 30 of the outgoing line cover, so as to realize cooling and heat exchange of the upper transition lead wire 211.

[0045] In some possible implementation manners, in order to effectively realize the connection between the tubular annular lead 1 and the upper transition lead 211 and realize the cooling heat exchange of the upper transition lead 211, a hard connecting piece 214 is arranged between the upper transition lead 211 and the tubular annular lead 1, and the air inlet B2141 is arranged on the hard connecting piece 214.

[0046] In some possible implementation manners, the air inlet assembly 23 comprises an insulating air inlet pipe arranged horizontally and in a tee shape; the insulating air inlet pipe comprises an air inlet pipe 232 arranged horizontally along an axis, and an insulating ventilation pipe 231 connected to one end of the air inlet pipe 232 and forming a T-shaped structure; the other end of the insulating ventilation pipe 231 is connected to the outlet sleeve 22; in this way, the oil in the generator can be effectively prevented from entering the insulating air inlet pipe 232, and the outlet sleeve 22 can be prevented from overheating.

[0047] The two ends of the air inlet pipe 232 along the axial direction are air inlets C, through which the cooling hydrogen is introduced into the insulating ventilation pipe 231, the outlet sleeve 22, and then the lower transition lead 212, so as to realize the cooling heat exchange of the outlet sleeve 22 and the lower transition lead 212; the hot hydrogen after the heat exchange is discharged to the outlet cover inner wall air duct 30 through the air outlet B2131, and is transported to the low-pressure area through the outlet cover inner wall air duct 30.

[0048] In some possible implementation manners, the tubular annular lead 1 comprises a main lead 11 arranged in a circular arc shape and connected to one end of the outlet assembly 2, and a lead-in 12 connected to the other end of the main lead 11 away from the outlet assembly 2; the air inlet A121 is arranged on the lead-in 12; and the air outlet A111 is arranged on the main lead 11.

[0049] In some possible implementation manners, the lead insulating air pipe 13 is arranged on the air outlet A111; the hot hydrogen after the heat exchange with the tubular annular lead 1 is transported to the low-pressure area through the lead insulating air pipe 13 arranged on the air outlet A111 and communicated with the low-pressure area.

[0050] Further, the tubular annular lead 1 is made of copper pipe;

[0051] The application can effectively shorten the air path, reduce the air outlet temperature, and reduce the amount of copper, so as to solve the problem of high temperature of the annular lead and the outlet of the large-current full-hydrogen-cooled generator, and improve the reliability of the generator operation.

[0052] On the other hand:

[0053] According to the cooling method of the hydrogen-cooled generator lead-out line cooling air path structure, the copper bar external cooling component 10 is used for external cooling, the copper pipe internal cooling component 20 forms a cooling air path for internal cooling, and the cooling is performed by combining external cooling and internal cooling; the cooling air path includes a lead cooling parallel air path and an outgoing line cooling parallel air path.

[0054] In some possible embodiments, the internal cooling by the lead cooling parallel air path specifically refers to:

[0055] The cooling hydrogen enters the tubular annular lead 1 from the air inlet A121, flows through the air duct formed by the tubular annular lead 1, and reaches the air outlet A111 after heat exchange;

[0056] The cooling hydrogen enters the tubular annular lead 1 from the air inlet B2141, flows through the air duct of the tubular annular lead 1, and reaches the air outlet A111 after heat exchange;

[0057] The hot hydrogen after heat exchange is combined into the air outlet A111 and is discharged to a low-pressure area through the lead insulation air pipe 13, so as to cool the annular lead.

[0058] In some possible embodiments, the internal cooling by the outgoing line cooling parallel air path specifically refers to:

[0059] The cooling hydrogen enters the upper transition lead 211 from the air inlet B2141, enters the support sleeve 213 after the upper transition lead 211, and realizes heat exchange of the upper transition lead 211;

[0060] The cooling hydrogen enters the air inlet pipe 232, flows through the hollow structure of the insulation air inlet pipe 231, and then passes through the outgoing line sleeve 22, the lower transition lead 212, and the support sleeve 213, so as to realize heat exchange of the outgoing line sleeve 22 and the lower transition lead 212;

[0061] The hot hydrogen after heat exchange is combined in the support sleeve 213, enters the outgoing line cover inner wall air duct 30 through the air outlet B2131, and then enters a low-pressure area.

[0062] The present application is not limited to the foregoing specific embodiments. The present application extends to any new feature or any new combination disclosed in the specification, and any new method or process step or any new combination disclosed.

Claims

1. A hydrogen-cooled generator lead-out line cooling air path structure characterized by, The copper bar external cooling assembly, a plurality of copper pipe internal cooling assemblies matched with the copper bar external cooling assembly, and an inner wall air duct of an outgoing line cover connected with the copper pipe internal cooling assemblies are included. The copper pipe internal cooling assembly includes a tubular annular lead wire provided with an air inlet A and an air outlet A, and an outgoing line assembly connected with the tubular annular lead wire. The outgoing line assembly includes a transition lead wire assembly connected with the tubular annular lead wire and provided with an air outlet B and an air inlet B, an outgoing line sleeve connected with the transition lead wire assembly away from the tubular annular lead wire, and an air inlet assembly arranged on the outgoing line sleeve and communicated with the outgoing line sleeve. The transition lead wire assembly includes an upper transition lead wire connected with the tubular annular lead wire, and a lower transition lead wire connected with the upper transition lead wire away from the tubular annular lead wire. The transition lead wire assembly further includes a support sleeve arranged between the upper transition lead wire and the lower transition lead wire; and the air outlet B is arranged on the support sleeve and communicated with the inner wall air duct of the outgoing line cover. A hard connecting piece is arranged between the upper transition lead wire and the tubular annular lead wire, and the air inlet B is arranged on the hard connecting piece. The tubular annular lead wire includes a main line in the shape of a circular arc and connected with the outgoing line assembly at one end, and a lead-in wire connected with the main line away from the outgoing line assembly; the air inlet A is arranged on the lead-in wire; and the air outlet A is arranged on the main line.

2. The hydrogen-cooled generator lead-out line cooling air path structure according to claim 1, characterized by The air inlet assembly includes an insulating air inlet pipe arranged horizontally and in the shape of a tee joint; the insulating air inlet pipe includes an air inlet pipe with an axis arranged horizontally, and an insulating ventilation pipe connected with the air inlet pipe at one end and forming a T-shaped structure; the other end of the insulating ventilation pipe is connected with the outgoing line sleeve.

3. The hydrogen-cooled generator lead-out line cooling air path structure according to claim 1, characterized by An insulating lead wire air pipe is arranged on the air outlet A.

4. A cooling method for a hydrogen-cooled generator lead-out line cooling air path structure according to any one of claims 1 to 3, characterized by, The copper bar external cooling assembly is used for external cooling, the cooling air path formed by the copper pipe internal cooling assembly is used for internal cooling, and the cooling is performed by combining external cooling and internal cooling; the cooling air path includes a lead wire cooling parallel air path and an outgoing line cooling parallel air path.

5. The cooling method according to claim 4, characterized by The internal cooling by the lead wire cooling parallel air path is specifically as follows: Cooling hydrogen enters the tubular annular lead wire from the air inlet A, flows through the air duct formed by the tubular annular lead wire, exchanges heat, and then comes to the air outlet A; Cooling hydrogen enters the tubular annular lead wire from the air inlet B, flows through the air duct of the tubular annular lead wire, exchanges heat, and then comes to the air outlet A; The hot hydrogen after heat exchange is combined at the air outlet A and discharged to a low pressure area, so as to cool the annular lead wire.

6. The cooling method according to claim 5, characterized by The internal cooling by the outgoing line cooling parallel air path is specifically as follows: Cooling hydrogen enters the upper transition lead wire from the air inlet B, and then enters the support sleeve through the upper transition lead wire; Cooling hydrogen enters the air inlet pipe, flows through the hollow insulating ventilation pipe, and then passes through the outgoing line sleeve, the lower transition lead wire, and the support sleeve in sequence; The hot hydrogen after heat exchange is combined in the support sleeve, enters the air duct through the air outlet B, and then enters the low pressure area.

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