Emergency diesel generator set for nuclear power plant and exhaust auxiliary system thereof

Abstract

This invention provides an emergency diesel generator set for nuclear power plants and its exhaust auxiliary system, including a first exhaust pipe, a second exhaust pipe, an exhaust muffler, a condensate drain pipe, a corrugated metal expansion joint, a fixed bracket, and a sliding guide bracket. The exhaust port of the diesel engine body is connected to the first exhaust pipe through the corrugated metal expansion joint. The first exhaust pipe is connected to the inlet of the exhaust muffler, and the outlet of the exhaust muffler is open to the atmosphere through the second exhaust pipe. The condensate drain pipe is located at the bottom of the exhaust muffler. The fixed bracket is located in the middle of the exhaust muffler. This invention has a simple and compact structure, using a sliding guide bracket to replace the conventional design of setting corrugated metal expansion joints before and after the exhaust muffler, thereby reducing material and maintenance costs and fundamentally eliminating the flue gas leakage problem caused by the failure of the front and rear expansion joints.

Description

Technical Field

[0001] This invention relates to the field of exhaust auxiliary system technology, and more specifically, to an emergency diesel generator set for nuclear power plants and its exhaust auxiliary system. Background Technology

[0002] The exhaust system is used to vent the high-temperature exhaust gases generated during the operation of emergency diesel generator sets at nuclear power plants to the outside.

[0003] Existing exhaust assist systems typically use corrugated metal expansion joints at the inlet and outlet of the exhaust muffler to absorb displacement caused by the piping and the muffler. However, this design not only increases material and maintenance costs, but also poses a potential leakage problem if the corrugated metal expansion joint fails. Summary of the Invention

[0004] To address the aforementioned shortcomings in the prior art, this invention provides an emergency diesel generator set for nuclear power plants and its exhaust auxiliary system.

[0005] According to one aspect of the present invention, an exhaust auxiliary system for an emergency diesel generator set used in a nuclear power plant is provided, comprising a first exhaust pipe, a second exhaust pipe, an exhaust muffler, a condensate drain pipe, a corrugated metal expansion joint, a fixed bracket, and a sliding guide bracket; wherein:

[0006] The corrugated metal expansion joint is connected to the first exhaust pipe;

[0007] The first exhaust pipe is connected to the inlet of the exhaust muffler, and the outlet of the exhaust muffler is connected to the atmosphere through the second exhaust pipe;

[0008] The condensate drain pipe is located at the bottom of the exhaust muffler;

[0009] The fixed bracket is located in the middle part of the exhaust muffler;

[0010] The sliding guide brackets are respectively installed on the first exhaust pipe and the second exhaust pipe.

[0011] Preferably, the first exhaust pipe and the second exhaust pipe are arranged in a straight up-down configuration.

[0012] Preferably, the sliding guide bracket and the fixed bracket are welded to the embedded plate in the concrete floor slab.

[0013] Preferably, the welded joint is a fillet weld.

[0014] Preferably, a concrete protrusion is provided at the edge of the reserved hole in the concrete floor slab.

[0015] Preferably, the surfaces of the first exhaust pipe and the second exhaust pipe are respectively covered with heat-insulating material.

[0016] Preferably, the exhaust outlet of the second exhaust duct is higher than the top of the building and opens in the direction of the wind.

[0017] Preferably, the exhaust outlet of the second exhaust pipe is not directly facing flammable substances and / or buildings.

[0018] Preferably, a rain cap is provided at the smoke exhaust outlet.

[0019] Preferably, the condensate drain pipe adopts a U-shaped liquid seal structure.

[0020] According to another aspect of the present invention, an emergency diesel generator set for a nuclear power plant is provided, comprising a diesel engine body and an exhaust auxiliary system as described in any of the above claims; wherein: the exhaust port of the diesel engine body is connected to the first exhaust pipe through the metal corrugated expansion joint.

[0021] By adopting the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art:

[0022] The present invention provides an emergency diesel generator set for nuclear power plants and its exhaust auxiliary system. A fixed bracket is set in the middle part of the exhaust muffler equipment, which can be used to support the weight of the exhaust pipes before and after the exhaust muffler and relieve the weight of the diesel engine body outlet.

[0023] The emergency diesel generator set for nuclear power plants and its exhaust auxiliary system provided by this invention adopt a straight-up-down arrangement for the exhaust pipe, so that the entire exhaust system is without bends, reducing the number of bends used. In addition, the diameter of the first exhaust pipe can be appropriately larger than the outlet pipe diameter of the turbocharger on the diesel engine body, so that the total exhaust resistance is less than the limitation of the diesel engine back pressure, which is conducive to the exhaust of flue gas outdoors.

[0024] The emergency diesel generator set for nuclear power plants and its exhaust auxiliary system provided by this invention take into account the thermal expansion of the pipelines and use the exhaust muffler as a fixed support point, that is, set up a fixed bracket to support the weight of the exhaust pipes before and after the exhaust muffler. The exhaust pipe at the rear end of the exhaust muffler is equipped with a sliding guide bracket to expand freely upward. The exhaust pipe at the front end of the exhaust muffler is also equipped with a sliding guide bracket. The expansion displacement is absorbed by the metal corrugated expansion joint on the diesel engine body. By using sliding brackets to replace the conventional design of setting metal corrugated expansion joints before and after the exhaust muffler, material costs and maintenance costs are reduced, and the problem of flue gas leakage caused by the failure of the front and rear expansion joints is fundamentally eliminated.

[0025] The present invention provides an emergency diesel generator set for nuclear power plants and its exhaust auxiliary system. The surface of the exhaust pipe is covered with heat insulation material so that the outer surface temperature of the heat insulation material does not exceed 60°C. At the same time, a condensate drain pipe is set at the bottom of the exhaust muffler to form a U-shaped liquid seal. This double protection reduces the corrosion of the pipeline by condensate. The U-shaped pipe is filled with liquid to maintain the internal pressure of the exhaust system and prevent high-temperature flue gas leakage.

[0026] The emergency diesel generator set and its exhaust auxiliary system for nuclear power plants provided by this invention have the characteristics of low cost, reliable operation and convenient plant layout. They can effectively solve the problems of high material cost and maintenance cost in the prior art, and the potential leakage caused by the failure of the metal corrugated expansion joint. Attached Figure Description

[0027] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the exhaust auxiliary system of an emergency diesel generator set for a nuclear power plant in one embodiment of the present invention.

[0029] Figure 2 This is a front view of the fixed bracket in a preferred embodiment of the present invention.

[0030] Figure 3 This is a top view of the fixed bracket in a preferred embodiment of the present invention.

[0031] Figure 4 This is an isometric view of a sliding guide bracket in a preferred embodiment of the present invention.

[0032] Figure 5 This is a top view of a sliding guide bracket in a preferred embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the welding of the fixed bracket, the sliding guide bracket and the embedded plate in a preferred embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the condensate drain pipe structure in a preferred embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the structure of an emergency diesel generator set for a nuclear power plant in one embodiment of the present invention.

[0036] In the diagram: 1 is the diesel engine body; 1-1 is the exhaust port of the diesel engine body; 2-1 is the first exhaust pipe; 2-2 is the second exhaust pipe; 3 is the exhaust muffler; 3-1 is the muffler inlet; 3-2 is the exhaust muffler outlet; 4 is the condensate drain pipe; 5 is the metal bellows expansion joint; 6 is the fixed bracket; 7 is the sliding guide bracket; 8 is the insulation material; 9 is the rain cap; 10 is the embedded plate; 11 is the concrete floor slab; 12 is the welded joint; 13 is the concrete boss; B is the welding position between the fixed bracket and the sliding guide bracket and the embedded plate in the concrete floor slab. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

[0038] Figure 1 This is a schematic diagram of the exhaust auxiliary system of an emergency diesel generator set for a nuclear power plant, provided in an embodiment of the present invention.

[0039] like Figure 1 As shown, the exhaust auxiliary system for an emergency diesel generator set used in a nuclear power plant provided in this embodiment may include: a first exhaust pipe 2-1, a second exhaust pipe 2-2, an exhaust muffler 3, a condensate drain pipe 4, a corrugated metal expansion joint 5, a fixed bracket 6, and a sliding guide bracket 7; wherein:

[0040] The metal corrugated expansion joint 5 is connected to the first exhaust pipe 2-1;

[0041] The first exhaust pipe 2-1 is connected to the inlet 3-1 of the exhaust muffler 3, and the outlet 3-2 of the exhaust muffler 3 is connected to the atmosphere through the second exhaust pipe 2-2;

[0042] The condensate drain pipe 4 is located at the bottom of the exhaust muffler 3;

[0043] The fixed bracket 6 is located in the middle of the exhaust muffler 3;

[0044] Sliding guide supports 7 are respectively installed on the first exhaust pipe 2-1 and the second exhaust pipe 2-2.

[0045] In this embodiment, as a preferred embodiment, the first exhaust pipe 2-1 and the second exhaust pipe 2-2 adopt a straight-up-down arrangement.

[0046] In this embodiment, as a preferred embodiment, the sliding guide bracket 7 and the fixed bracket 6 are respectively welded to the embedded plate 10 in the concrete floor slab 11.

[0047] In this embodiment, as a preferred embodiment, the welded joint 12 is a fillet weld.

[0048] In this embodiment, as a preferred embodiment, a concrete protrusion 13 is provided at the edge of the reserved hole in the concrete floor slab 11.

[0049] In this embodiment, as a preferred embodiment, the surfaces of the first exhaust pipe 2-1 and the second exhaust pipe 2-2 are respectively covered with heat-insulating material 8.

[0050] In this embodiment, as a preferred embodiment, the smoke exhaust outlet of the second exhaust pipe 2-2 is higher than the top of the building and opens in the windward direction.

[0051] In this embodiment, as a preferred embodiment, the exhaust outlet of the second exhaust pipe 2-2 is not directly facing flammable substances and / or buildings.

[0052] In this embodiment, as a preferred embodiment, a rain cap 9 is provided at the smoke exhaust outlet.

[0053] In this embodiment, as a preferred embodiment, the condensate drain pipe 4 adopts a U-shaped liquid seal structure.

[0054] The technical solutions provided by the above embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0055] like Figure 1 As shown, the exhaust auxiliary system for an emergency diesel generator set for nuclear power plants provided in the above embodiments of the present invention includes a first exhaust pipe 2-1, a second exhaust pipe 2-2, an exhaust muffler 3, a condensate drain pipe 4, a corrugated metal expansion joint 5, a sliding guide bracket 7, and a fixed bracket 6. The corrugated metal expansion joint 5 is connected to the first exhaust pipe 2-1, the first exhaust pipe 2-1 is connected to the inlet 3-1 of the exhaust muffler 3, the outlet 3-2 of the exhaust muffler 3 is open to the atmosphere through the second exhaust pipe 2-1, and the condensate drain pipe 4 is provided at the bottom of the exhaust muffler 3.

[0056] A fixed bracket 6 is installed in the middle of the exhaust muffler 3. It can be used to support the weight of the exhaust pipes before and after the exhaust muffler, and to relieve the weight on the diesel engine outlet.

[0057] Sliding guide supports 7 are respectively installed on the first exhaust pipe 2-1 and the second exhaust pipe 2-2, which are connected to the exhaust muffler 3. The sliding guide support 7 on the second exhaust pipe 2-2, which is connected to the outlet 3-2 of the exhaust muffler 3, expands freely upwards. The expansion displacement of the sliding guide support 7 on the first exhaust pipe 2-1, which is connected to the inlet 3-1 of the exhaust muffler 3, is absorbed by the metal corrugated expansion joint 5. By using the sliding guide support 7 to replace the conventional design of setting front and rear expansion joints at the inlet and outlet ends of the exhaust muffler 3, material and maintenance costs are reduced, and the problem of flue gas leakage caused by the failure of the front and rear expansion joints is fundamentally eliminated. The metal corrugated expansion joint 5 is in a pre-stretched state during installation.

[0058] The first exhaust pipe 2-1 and the second exhaust pipe 2-2 are arranged in a straight line. The entire exhaust system has no bends, reducing the number of bends used. The piping structure is simple and compact, and the diameter of the first exhaust pipe can be appropriately larger than the outlet diameter of the turbocharger on the diesel engine body, so that the total exhaust resistance is less than the limitation of the diesel engine back pressure, which is conducive to the exhaust gas being discharged outdoors.

[0059] The sliding guide bracket 7 and the fixed bracket 6 are welded to the embedded plate 10 in the concrete floor slab 11. The weld joint 12 is a fillet weld. A concrete boss 13 is provided at the edge of the reserved hole in the concrete floor slab 11. After the embedded plate 10 is embedded in the concrete floor slab 11, it must be kept flat and smooth, and the upper surface of the embedded plate 10 is flush with the upper surface of the concrete floor slab 11. The concrete boss 13 can prevent leaked liquid from this floor from leaking to the next floor.

[0060] The surfaces of the first exhaust pipe 2-1 and the second exhaust pipe 2-2 are respectively covered with heat insulation material 8. The bottom of the exhaust muffler 3 is equipped with a condensate drain pipe 4 in the form of a U-shaped liquid seal, which provides double protection to reduce the corrosion of the pipe by condensate. The U-shaped pipe is filled with liquid to maintain the pressure inside the exhaust system and prevent high-temperature flue gas leakage.

[0061] Figure 8 This is a schematic diagram of the structure of an emergency diesel generator set for nuclear power plants provided in an embodiment of the present invention.

[0062] like Figure 8 As shown, the emergency diesel generator set for nuclear power plants provided in this embodiment may include a diesel engine body 1 and any of the exhaust auxiliary systems in the above embodiments of the present invention; wherein: the exhaust port 1-1 of the diesel engine body 1 is connected to the first exhaust pipe 2-1 through a metal corrugated expansion joint 5.

[0063] The emergency diesel generator set for nuclear power plants provided in the above embodiments of the present invention uses the exhaust muffler 3 as a fixed support point, that is, a fixed bracket is set to support the weight of the exhaust pipes before and after the exhaust muffler 3. The exhaust pipe at the outlet end of the exhaust muffler 3 is equipped with a sliding guide bracket, which can expand freely upward. The exhaust pipe at the inlet end of the exhaust muffler 3 is also equipped with a sliding guide bracket. Its expansion displacement is absorbed by the metal corrugated expansion joint 5 connected to the diesel engine body 1. The conventional design of setting front and rear expansion joints in the exhaust muffler 3 is replaced by the sliding guide bracket, thereby reducing material and maintenance costs and fundamentally eliminating the flue gas leakage problem caused by the failure of the front and rear expansion joints.

[0064] The emergency diesel generator set and its exhaust auxiliary system for nuclear power plants provided in the above embodiments of the present invention discharge the high-temperature exhaust gas generated during unit operation to the outside through the exhaust auxiliary system. The exhaust port of the diesel engine body is connected to the exhaust pipe through a metal corrugated expansion joint. The exhaust pipe is connected to the inlet of the exhaust muffler, and the outlet of the exhaust muffler is open to the atmosphere through the exhaust pipe. The exhaust muffler is used to reduce noise. The exhaust pipe is arranged in a straight line, so that the entire exhaust auxiliary system has no bends, the piping is simple and beautiful, and it is easier to meet the back pressure requirements of the diesel engine. The vent of the exhaust muffler is connected to the condensate drain pipe. To prevent oil and gas leakage, the condensate drain pipe is set as a U-shaped liquid seal. The exhaust auxiliary system considers the thermal expansion of both the first and second exhaust pipes. The specific design concept is as follows: the exhaust muffler is used as a fixed support point, i.e., a fixed bracket is installed to support the weight of the exhaust pipes before and after the muffler. Sliding guide brackets are installed at the front and rear ends of the first and second exhaust pipes. Under high-temperature operating conditions, the second exhaust pipe expands freely upwards, while the thermal expansion displacement of the first exhaust pipe is absorbed by the metal corrugated expansion joint connected to the diesel engine body. The emergency diesel generator set for nuclear power plants and its exhaust auxiliary system provided in the above embodiments of the present invention utilize sliding guide brackets to replace the conventional design of setting metal corrugated expansion joints before and after the exhaust muffler, thereby reducing material and maintenance costs and fundamentally eliminating the flue gas leakage problem caused by the failure of the front and rear metal corrugated expansion joints.

[0065] Any matters not covered in the above embodiments of the present invention are well-known in the art.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An exhaust auxiliary system for an emergency diesel generator set used in a nuclear power plant, characterized in that, It includes a first exhaust pipe (2-1), a second exhaust pipe (2-2), an exhaust muffler (3), a condensate drain pipe (4), a metal corrugated expansion joint (5), a fixed bracket (6), and a sliding guide bracket (7); wherein: The corrugated metal expansion joint (5) is connected to the first exhaust pipe (2-1); The first exhaust pipe (2-1) is connected to the inlet (3-1) of the exhaust muffler (3), and the outlet (3-2) of the exhaust muffler (3) is connected to the atmosphere through the second exhaust pipe (2-2); The condensate drain pipe (4) is located at the bottom of the exhaust muffler (3) and adopts a U-shaped pipe liquid seal structure; The fixed bracket (6) is located in the middle of the exhaust muffler (3) and is used to support the weight of the exhaust pipes before and after the exhaust muffler. The sliding guide bracket (7) is respectively provided on the first exhaust pipe (2-1) and the second exhaust pipe (2-2); wherein, the second exhaust pipe (2-2) is provided with a sliding guide bracket and expands freely upward, and the first exhaust pipe (2-1) is provided with a sliding guide bracket, the expansion displacement of which is absorbed by the metal corrugated expansion joint (5), and the sliding guide bracket is used to replace the metal corrugated expansion joints set before and after the exhaust muffler; The first exhaust pipe (2-1) and the second exhaust pipe (2-2) are arranged in a straight up-down manner.

2. The exhaust auxiliary system for an emergency diesel generator set for a nuclear power plant according to claim 1, characterized in that, The sliding guide bracket (7) and the fixed bracket (6) are respectively welded to the embedded plate (10) in the concrete floor slab (11).

3. The exhaust auxiliary system for an emergency diesel generator set for a nuclear power plant according to claim 2, characterized in that, The welded joint (12) is a fillet weld.

4. The exhaust auxiliary system for an emergency diesel generator set for a nuclear power plant according to claim 2, characterized in that, A concrete boss (13) is provided at the edge of the reserved hole in the concrete floor slab (11).

5. The exhaust auxiliary system for an emergency diesel generator set for a nuclear power plant according to claim 1, characterized in that, The surfaces of the first exhaust pipe (2-1) and the second exhaust pipe (2-2) are respectively covered with heat-insulating material (8).

6. The exhaust auxiliary system for an emergency diesel generator set for a nuclear power plant according to claim 1, characterized in that, The exhaust outlet of the second exhaust duct (2-2) is higher than the top of the building and opens in the windward direction.

7. The exhaust auxiliary system for an emergency diesel generator set for a nuclear power plant according to claim 6, characterized in that, A rain cap (9) is installed at the smoke exhaust outlet.

8. An emergency diesel generator set for a nuclear power plant, characterized in that, The system includes a diesel engine body (1) and an exhaust assist system according to any one of claims 1-7; wherein: the exhaust port (1-1) of the diesel engine body (1) is connected to the first exhaust pipe (2-1) through the metal corrugated expansion joint (5).

Images