A preheating and pre-supply unit for nuclear power emergency diesel generator set

Abstract

This invention relates to a preheating and pre-supply unit for nuclear power emergency diesel generator sets, comprising: at least two parallel lubricating oil pre-supply pumps for powering the lubricating oil in the lubricating oil supply pipeline; at least two parallel high-temperature water preheating pumps for powering the water in the water supply pipeline; a heat exchanger for connecting the water supply pipeline and the lubricating oil supply pipeline respectively, to achieve heat exchange between the water in the water supply pipeline and the lubricating oil in the lubricating oil supply pipeline before the emergency diesel generator set is put into operation; and a high-temperature water heating module for heating the water in the water supply pipeline to a set temperature. This invention, through the parallel arrangement of the lubricating oil pre-supply pumps and the parallel arrangement of the high-temperature water preheating pumps, ensures the stability of the lubricating oil supply and the high-temperature water supply, avoids interruptions in the high-temperature water and lubricating oil supply due to malfunctions, and allows for the shutdown of certain parts for maintenance and other related operations without affecting the overall operation of the equipment.

Description

Technical Field

[0001] This invention relates to the field of nuclear power emergency diesel generator sets, and more specifically to a preheating and pre-supply unit for nuclear power emergency diesel generator sets. Background Technology

[0002] The use of diesel generator sets in nuclear power plants is a crucial component of their safety protection system, often referred to as the last line of defense. Nuclear power plants have a high safety standard, thus requiring auxiliary equipment to be reliable, have a low failure rate, and be easy to maintain. When the lubricating oil temperature is below the required level, nuclear-grade emergency diesel generator sets cannot be started immediately in an emergency. Therefore, existing technology uses a high-temperature water preheating pump to supply high-temperature water to the lubricating oil, preheating the lubricating oil supplied by the lubricating oil pre-supply pump. This ensures that the lubricating oil temperature remains within the required range, guaranteeing the nuclear-grade emergency diesel generator sets' ability to start immediately even in low-temperature environments.

[0003] To avoid disrupting the normal operation of the entire diesel engine unit due to circuit interruption caused by malfunctions of the high-temperature water preheating pump and lubricating oil pre-supply pump, measures need to be taken to prevent this problem. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a preheating and pre-supply unit for nuclear power emergency diesel generator sets. On the one hand, it ensures that the temperature of the lubricating oil is sufficient to enable the nuclear-grade emergency diesel generator set to start at any time. On the other hand, it ensures the stability of the preheating and pre-supply unit's operation and avoids supply interruptions.

[0005] The technical objective of this invention is achieved through the following technical solution: A preheating and pre-supply unit for nuclear power emergency diesel generator sets includes: At least two parallel lubricating oil pre-supply pumps are used to power the lubricating oil in the lubricating oil supply line; At least two high-temperature water preheating pumps connected in parallel are used to power the water in the water supply pipeline; High-temperature water heating module is used to heat the water in the water supply pipeline to a set temperature; The heat exchanger is used to connect the water supply pipeline and the lubricating oil supply pipeline respectively, so that the water in the water supply pipeline heated by the high-temperature water heating module and the lubricating oil in the lubricating oil supply pipeline can exchange heat before the emergency diesel generator set is put into operation.

[0006] Furthermore, the lubricating oil supply pipeline includes a lubricating oil delivery main pipe and several parallel lubricating oil supply branch pipes. Each lubricating oil supply branch pipe is connected to a lubricating oil pre-supply pump. The several lubricating oil supply branch pipes are respectively connected to the lubricating oil delivery main pipe, and the lubricating oil supply branch pipes are connected to the heat exchanger through the lubricating oil delivery main pipe.

[0007] Furthermore, the water supply pipeline includes a main water supply pipe and several parallel water supply branch pipes. Each water supply branch pipe is connected to a high-temperature water preheating pump. The several parallel water supply branch pipes are connected to the main water supply pipe. The water supply branch pipes are connected to the input end of the high-temperature water heating module through the main water supply pipe. The output end of the high-temperature water heating module delivers heated water to the heat exchanger through the main water supply pipe.

[0008] Furthermore, the lubricating oil supply branch pipe is equipped with a control valve, a lubricating oil pre-supply pump, a check valve, and a control valve in sequence along the direction of lubricating oil flow, and the water supply branch pipe is equipped with a control valve, a high-temperature water preheating pump, a check valve, and a control valve in sequence along the direction of water flow.

[0009] Furthermore, the lubricating oil delivery main pipe is also equipped with a first lubricating oil temperature measuring device and a first lubricating oil pressure measuring device for measuring the temperature and pressure of the lubricating oil in the lubricating oil delivery main pipe; the water supply main pipe between the high-temperature water heating module and the water supply branch pipe is also equipped with a first water temperature measuring device and a first water pressure measuring device for measuring the water temperature and pressure in the water supply main pipe before heating; the water supply main pipe between the high-temperature water heating module and the heat exchanger is also equipped with a second water temperature measuring device and a second water pressure measuring device for measuring the water temperature and pressure in the water supply main pipe after heating.

[0010] Furthermore, the lubricating oil pre-supply pump, lubricating oil supply pipeline, high-temperature water preheating pump, water supply pipeline, heat exchanger and high-temperature water heating module are respectively installed on the base. Several base pads are set at the bottom of the base, and the base is welded and fixed to the civil engineering embedded plate through the base pads.

[0011] Furthermore, the upper end of the base is provided with a lubricating oil pre-supply pump pad for mounting and positioning the lubricating oil pre-supply pump, a high-temperature water preheating pump pad for mounting and positioning the high-temperature water preheating pump, a heat exchanger pad for mounting and positioning the heat exchanger, and a high-temperature water heating module pad for mounting and positioning the high-temperature water heating module. The lubricating oil pre-supply pump, the high-temperature water preheating pump, the heat exchanger, and the high-temperature water heating module are respectively assembled and installed on the corresponding pads.

[0012] Furthermore, the base is also connected to a grounding plate for grounding.

[0013] Furthermore, a pipe support for supporting the lubricating oil supply pipe and the water supply pipe is also installed on the base; the pipe support includes a base plate, a support column set vertically above the base plate, a reinforcing rib plate at the connection between the lower end of the support column and the base plate, and a binding bridge for cable support is also provided on the side of the support column near the upper end of the support column.

[0014] Furthermore, the lubricating oil supply line is equipped with a jumper wire at the flange connection of the pipeline to conduct electricity.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention ensures the stability of lubricating oil supply and high-temperature water supply by using a parallel-connected lubricating oil pre-supply pump and a parallel-connected high-temperature water preheating pump, avoiding interruptions in the supply of high-temperature water and lubricating oil due to malfunctions, and allowing for maintenance and other related operations by shutting down certain parts as needed without affecting the overall operation of the equipment.

[0016] 2. The preheating and pre-supply unit for nuclear power emergency diesel generator sets of the present invention provides power to high-temperature water through a high-temperature water preheating pump, and preheats the lubricating oil supplied by the lubricating oil pre-supply pump through the high-temperature water, so that the lubricating oil can be maintained at the required temperature, so as to ensure that the emergency diesel generator set can be started at any time in an emergency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the preheating and pre-supply unit for nuclear power emergency diesel generator sets according to the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the lubricating oil pre-supply pump connected to the lubricating oil supply pipeline in this invention.

[0019] Figure 3 This is a schematic diagram of the high-temperature water preheating pump connected to the water supply pipeline in this invention.

[0020] Figure 4 This is a schematic diagram of the base structure in this invention.

[0021] Figure 5 This is a schematic diagram of the pipeline support structure in this invention.

[0022] Figure 6 This is a schematic diagram of the jumper wire installation in this invention.

[0023] Figure 7 This is a schematic diagram of the pipe clamp installation in this invention.

[0024] Figure 8 This is a schematic diagram of the pipeline connection for the preheating and pre-supply unit of the nuclear power emergency diesel generator set in this invention.

[0025] In the picture: 1. Heat exchanger; 2. High-temperature water preheating pump; 3. High-temperature water heating module; 4. Lubricating oil pre-supply pump; 5. Lubricating oil main pipe; 6. Lubricating oil supply branch pipe; 7. Water supply main pipe; 8. Water supply branch pipe; 9. Base; 10. Clamp; 11. Pipe clamp; 51. First lubricating oil temperature measuring device; 52. First lubricating oil pressure measuring device; 53. Second lubricating oil temperature measuring device; 54. Second lubricating oil pressure measuring device; 55. Jumper wire; 61. Control valve; 62. Check valve; 63. Control valve; 71. First water temperature measuring device; 72. First water pressure measuring device; 73. Second water temperature measuring device; 74. Second water pressure measuring device; 81. Control valve; 82. Check valve; 83. Control valve; 91. Base pad; 92. Lubricating oil pre-supply pump pad; 93. High-temperature water preheating pump pad; 94. Heat exchanger pad; 95. High-temperature water heating module pad; 96. Grounding plate; 97. Secondary support base; 98. Pipe support; 99. Lifting lug; 981. Base plate; 982. Support column; 983. Reinforcing rib; 984. Binding bridge. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to specific embodiments: A preheating and pre-supply unit for nuclear power emergency diesel generator sets, such as Figures 1-3 and Figure 8 As shown, it includes: At least two parallel lubricating oil pre-supply pumps 4, in this embodiment, two parallel lubricating oil pre-supply pumps are used as an example to provide power to the lubricating oil in the lubricating oil supply pipeline; At least two high-temperature water preheating pumps 2 are connected in parallel. In this embodiment, two high-temperature water preheating pumps 2 are used as an example to provide power to the water in the water supply pipeline. Heat exchanger 1 is used to connect the water supply pipeline and the lubricating oil supply pipeline respectively, so as to realize the heat exchange between the water in the water supply pipeline heated by the high temperature water heating module and the lubricating oil in the lubricating oil supply pipeline before the emergency diesel generator set is put into operation. The heat exchanger can be a plate heat exchanger, a tubular heat exchanger, etc., and the lubricating oil is preheated through heat exchange. In one implementation process, a plate heat exchanger is selected.

[0027] The high-temperature water heating module 3 is used to heat the water in the water supply pipeline to the set temperature. In one implementation process, the high-temperature water heating module 3 adopts electric heating, which makes the temperature control more precise.

[0028] The lubricating oil supply pipeline includes a lubricating oil delivery main pipe 5 and several parallel lubricating oil supply branch pipes 6. In this embodiment, two lubricating oil pre-supply pumps 4 correspond to one lubricating oil supply branch pipe 6, and the number of lubricating oil supply branch pipes 6 and lubricating oil pre-supply pumps 4 are in one-to-one correspondence. The two lubricating oil supply branch pipes 6 are respectively connected to one lubricating oil delivery main pipe 5, and the lubricating oil supply branch pipes 6 are connected to the heat exchanger 1 through the lubricating oil delivery main pipe 5.

[0029] The water supply pipeline includes a main water supply pipe 7 and several parallel water supply branch pipes 8. In this embodiment, two water supply branch pipes are used as an example. Each water supply branch pipe 8 is connected to a high-temperature water preheating pump 2. The number of high-temperature water preheating pumps 2 corresponds one-to-one with the number of water supply branch pipes 8. The two parallel water supply branch pipes 8 are respectively connected to the main water supply pipe 7. The water supply branch pipes 8 are connected to the input end of the high-temperature water heating module 3 through the main water supply pipe 7. The output end of the high-temperature water heating module 3 delivers heated water to the heat exchanger 1 through the main water supply pipe 7.

[0030] The parallel high-temperature water preheating pumps 2 do not interfere with each other and can be used independently, and the parallel lubricating oil pre-supply pumps 4 do not interfere with each other and can be used independently, ensuring normal operation during maintenance and failure.

[0031] More specifically, the heat exchanger 1 is internally equipped with a physically separated first heat exchange chamber and a second heat exchange chamber. The first heat exchange chamber has a first heat exchange inlet and a first heat exchange outlet, and the second heat exchange chamber has a second heat exchange inlet and a second heat exchange outlet. The lubricating oil supply main pipe 5 is connected to the first heat exchange inlet to input lubricating oil into the first heat exchange chamber. The water supply main pipe 7 at the output end of the high-temperature water heating module 3 is connected to the second heat exchange inlet to input heated water into the second heat exchange chamber. The lubricating oil in the first heat exchange chamber and the water in the second heat exchange chamber exchange heat, causing the temperature of the lubricating oil to rise and the temperature of the water to drop. Then, the preheated lubricating oil is output from the first heat exchange outlet and sent to the emergency diesel generator set. The cooled water is discharged from the second heat exchange outlet. After a series of treatments, the water discharged from the second heat exchange outlet is sent back to the high-temperature water heating module 3 through the water supply pipeline for recycling.

[0032] More specifically, on the lubricating oil supply branch pipe 6, a control valve 61, a lubricating oil pre-supply pump 4, a check valve 62, and a control valve 63 are sequentially installed along the lubricating oil flow direction. On the water supply branch pipe 8, a control valve 81, a high-temperature water preheating pump 2, a check valve 82, and a control valve 83 are sequentially installed along the water flow direction. The check valves 62 and 82 prevent backflow in the pipelines.

[0033] The lubricating oil supply main pipe 5 is also equipped with a first lubricating oil temperature measuring device 51 and a first lubricating oil pressure measuring device 52 for measuring the temperature and pressure of the lubricating oil in the lubricating oil supply main pipe. A second lubricating oil temperature measuring device 53 and a second lubricating oil pressure measuring device 54 are also provided at the lubricating oil output end of the heat exchanger. The water supply main pipe 7 between the high-temperature water heating module 3 and the water supply branch pipe 8 is also equipped with a first water temperature measuring device 71 and a first water pressure measuring device 72 for measuring the water temperature and pressure in the water supply main pipe before heating. The water supply main pipe 7 between the high-temperature water heating module 3 and the heat exchanger 1 is also equipped with a second water temperature measuring device 73 and a second water pressure measuring device 74 for measuring the water temperature and pressure in the water supply main pipe after heating. The first lubricating oil temperature measuring device 51, the second lubricating oil temperature measuring device 52, the first water temperature measuring device 71, and the second water temperature measuring device 73 can be selected as measuring devices with temperature sensors. The first lubricating oil pressure measuring device 52, the second lubricating oil pressure measuring device, the first water pressure measuring device 72, and the second water pressure measuring device 74 can be selected as pressure measuring devices with pressure sensors. Pressure measurement can ensure the safety of the pressure inside the pipeline, and temperature measurement can enable more accurate temperature control based on the temperature measurement results, ensuring that the temperature of the lubricating oil is maintained at the required temperature.

[0034] More specifically, in one implementation process, the lubricating oil pre-supply pump 4, lubricating oil supply pipeline, high-temperature water preheating pump 2, water supply pipeline, heat exchanger 1, and high-temperature water heating module 3 are respectively installed on the base 9. Several base pads 91 are provided at the bottom of the base 9, and the base 9 is welded and fixed to the civil engineering embedded plate through the base pads 91. Figure 4 As shown. Exemplarily, the base 1 is welded from steel plate and H-beams, presenting an overall rectangular sheet frame structure. Bolt holes are also provided on the H-beams for mounting the pads, etc., as positioning holes, and the distance between the edges of the bolt holes is 1.5 times or more the hole diameter.

[0035] like Figure 4As shown, the upper end of the base 9 is provided with an oil pre-supply pump pad 92 for mounting and positioning the oil pre-supply pump 4, a high-temperature water preheating pump pad 93 for mounting and positioning the high-temperature water preheating pump 2, a heat exchanger pad 94 for mounting and positioning the heat exchanger 1, and a high-temperature water heating module pad 95 for mounting and positioning the high-temperature water heating module 3. The oil pre-supply pump 4, the high-temperature water preheating pump 2, the heat exchanger 1, and the high-temperature water heating module 3 are respectively assembled and installed on their respective pads. More specifically, the oil pre-supply pump pad 92, the heat exchanger pad 94, and the high-temperature water heating module pad 95 are all metal plate structures, while the high-temperature water preheating pump pad 93 uses channel steel as the pad. The lubricating oil preheating pump pad 92, heat exchanger pad 94, and high-temperature water heating module pad 95 are installed on-site to resolve height errors during installation. The channel steel of the high-temperature water preheating pump pad 93 is welded and fixed to the base. The lubricating oil preheating pump pad 92, heat exchanger pad 94, and high-temperature water heating module pad 95 are each provided with threaded holes that penetrate the pad. During subsequent installation, the threaded holes of the pads are aligned with the bolt holes on the H-beams. The lubricating oil preheating pump 4, heat exchanger 1, and high-temperature water heating module 3 are installed on the base at their respective pad positions using bolts. The channel steel of the high-temperature water preheating pump pad 93 is provided with waist-shaped holes to facilitate position adjustment during the subsequent installation of the high-temperature water preheating pump 2.

[0036] To facilitate grounding, the base 9 is also connected to a grounding plate 96.

[0037] In one embodiment, a secondary support base 97 is also installed on the base 9, such as... Figure 4 As shown, the secondary support base 97 is a frame welded from metal profiles. In this embodiment, it is welded from square steel pipes. The secondary support base 97 is welded and fixed on the base. Then, one lubricating oil pre-supply pump 4 is directly installed on the base 9 through the lubricating oil pre-supply pump pad 92. Another lubricating oil pre-supply pump 4 is installed on the upper end of the secondary support base 97 through the lubricating oil pre-supply pump pad 92. In order to facilitate grounding, the secondary support base 97 is also equipped with a grounding plate 96.

[0038] More specifically, the base 9 is also equipped with a pipe support 98 for supporting the lubricating oil supply pipes and water supply pipes, such as... Figure 5 As shown, the pipe support includes a base plate 981 and a support column 982 perpendicular to the top of the base plate. A reinforcing rib 983 is also provided at the lower end of the support column 982 where it connects to the base plate 981. A cable tie bridge 984 for cable support is also provided on the side of the support column 982 near the upper end. More specifically, the support column 982 is made of channel steel, while the base plate 981 and reinforcing rib 983 are both made of steel plate, and the three are welded together. A slotted hole is machined in the support column 982 to accommodate positional errors during pipe fixing. Similarly, slotted holes are also provided on the edge of the base plate 981 to facilitate adjustment of the pipe support's installation position. Figure 7 As shown, the lubricating oil supply pipeline and the water supply pipeline can be connected to the oblong hole of the support column 982 using JB / ZQ 4492 pipe clamp 11 and bolts. Preferably, to address errors in the pipeline connection, a clamp 10 can be installed at the pipeline connection point. The clamp 10 fills the reserved gap between the two pipeline sections. The clamp adopts a circumferential flexible fixing to address installation errors.

[0039] Preferably, lifting lugs 99 can also be welded onto the base, and the lifting lugs 99 are welded to the four corners of the base 9 to facilitate subsequent hoisting and installation.

[0040] Preferably, in one implementation, a jumper wire 55 for conducting electricity is also provided at the flange connection of the lubricating oil supply line, such as... Figure 6 As shown, the jumper wires are used to achieve electrical continuity between different sections of the lubricating oil supply pipeline, eliminate static electricity accumulation and potential difference, prevent static sparks from causing fires and explosions, and at the same time conduct stray currents to protect equipment and personnel safety.

[0041] Before the emergency diesel generator set needs to be started, lubricating oil is sent to heat exchanger 1 via lubricating oil pre-supply pump 4 to preheat the lubricating oil. This ensures that the lubricating oil temperature meets the requirements for starting the emergency diesel generator set at any time and allows it to quickly reach full load operation after startup. When partial pipeline maintenance is required, the corresponding control valve is closed, leaving only one pipeline operating normally.

[0042] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A preheating and pre-supply unit for nuclear power emergency diesel generator sets, characterized in that, include: At least two parallel lubricating oil pre-supply pumps are used to power the lubricating oil in the lubricating oil supply line; At least two high-temperature water preheating pumps connected in parallel are used to power the water in the water supply pipeline; High-temperature water heating module is used to heat the water in the water supply pipeline to a set temperature; The heat exchanger is used to connect the water supply pipeline and the lubricating oil supply pipeline respectively, so that the water in the water supply pipeline heated by the high-temperature water heating module and the lubricating oil in the lubricating oil supply pipeline can exchange heat before the emergency diesel generator set is put into operation.

2. The preheating and pre-supply unit for nuclear power emergency diesel generator sets according to claim 1, characterized in that, The lubricating oil supply pipeline includes a lubricating oil delivery main pipe and several parallel lubricating oil supply branch pipes. Each lubricating oil supply branch pipe is connected to a lubricating oil pre-supply pump. The several lubricating oil supply branch pipes are respectively connected to the lubricating oil delivery main pipe, and the lubricating oil supply branch pipes are connected to the heat exchanger through the lubricating oil delivery main pipe.

3. A preheating and pre-supply unit for nuclear power emergency diesel generator sets according to claim 2, characterized in that, The water supply pipeline includes a main water supply pipe and several parallel water supply branch pipes. Each water supply branch pipe is connected to a high-temperature water preheating pump. The several parallel water supply branch pipes are connected to the main water supply pipe. The water supply branch pipes are connected to the input end of the high-temperature water heating module through the main water supply pipe. The output end of the high-temperature water heating module delivers heated water to the heat exchanger through the main water supply pipe.

4. A preheating and pre-supply unit for nuclear power emergency diesel generator sets according to claim 3, characterized in that, The lubricating oil supply branch pipe is provided with a control valve, a lubricating oil pre-supply pump, a check valve, and a control valve in sequence along the lubricating oil flow direction. The water supply branch pipe is provided with a control valve, a high-temperature water preheating pump, a check valve, and a control valve in sequence along the water flow direction.

5. A preheating and pre-supply unit for nuclear power emergency diesel generator sets according to claim 4, characterized in that, The lubricating oil delivery main pipe is also equipped with a first lubricating oil temperature measuring device and a first lubricating oil pressure measuring device for measuring the lubricating oil temperature and pressure in the lubricating oil delivery main pipe; the water supply main pipe between the high-temperature water heating module and the water supply branch pipe is also equipped with a first water temperature measuring device and a first water pressure measuring device for measuring the water temperature and pressure in the water supply main pipe before heating; the water supply main pipe between the high-temperature water heating module and the heat exchanger is also equipped with a second water temperature measuring device and a second water pressure measuring device for measuring the water temperature and pressure in the water supply main pipe after heating.

6. A preheating and pre-supply unit for a nuclear power emergency generator set according to any one of claims 1 to 5, characterized in that, The lubricating oil pre-supply pump, lubricating oil supply pipeline, high-temperature water preheating pump, water supply pipeline, heat exchanger and high-temperature water heating module are respectively installed on the base. Several base pads are provided at the bottom of the base, and the base is welded and fixed to the civil engineering embedded plate through the base pads.

7. A preheating and pre-supply unit for a nuclear power emergency generator set according to claim 6, characterized in that, The upper end of the base is provided with a lubricating oil pre-supply pump pad for installation and positioning, a high-temperature water preheating pump pad for installation and positioning, a heat exchanger pad for installation and positioning, and a high-temperature water heating module pad for installation and positioning. The lubricating oil pre-supply pump, the high-temperature water preheating pump, the heat exchanger, and the high-temperature water heating module are respectively assembled and installed on the corresponding pads.

8. A preheating and pre-supply unit for a nuclear power emergency generator set according to claim 7, characterized in that, The base is also connected to a grounding plate.

9. A preheating and pre-supply unit for a nuclear power emergency generator set according to claim 6, characterized in that, The base is also equipped with a pipe support for supporting the lubricating oil supply pipe and the water supply pipe; the pipe support includes a base plate and a support column arranged vertically above the base plate. A reinforcing rib is also provided at the connection between the lower end of the support column and the base plate. A binding bridge for cable support is also provided on the side of the support column near the upper end of the support column.

10. A preheating and pre-supply unit for a nuclear power emergency generator set according to claim 1, characterized in that, The lubricating oil supply pipeline is also equipped with a jumper wire at the flange connection of the pipeline to conduct electricity.

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