CN212508861U - Nuclear power plant is with emergent moisturizing diesel engine pump package of return circuit and system - Google Patents

Abstract

The utility model discloses a nuclear power plant primary loop emergency water supplement diesel engine pump set and a system, which are used for solving the problems that an emergency water supplement device can be started by an alternating current power supply, but when encountering the problems of earthquake and fire, the power supply is completely failed, and the emergency water supplement device can not be started; a loop emergency water-replenishing diesel engine pump set belongs to a high-pressure pump and is 45m at a working point³/hThe lift can reach 900 m; the emergency water-replenishing diesel engine pump unit system of a loop can realize the regulation of 5 working point flows and lifts, and the flow is 45m³H adjusted to 15m³The utility model discloses a water supply system for diesel engine pump set, including the carriage, the carriage is equipped with the pump group system, the pump group system is installed inside the carriage, the pump head descends to 165m from 900m simultaneously, whole set of pump group system installation has reduced the problem that emergent moisturizing diesel engine pump set system relies on emergency power source, when the calamity takes place, even emergency power source trouble, emergent moisturizing diesel engine pump set system still can work, emergent moisturizing diesel engine pump set system installation has increased the removal convenience of emergent moisturizing diesel engine pump set system in the carriage simultaneously.

Description

Nuclear power plant is with emergent moisturizing diesel engine pump package of return circuit and system

Technical Field

The utility model belongs to the field of emergency equipment; relates to the technology of emergency equipment of nuclear power stations; in particular to a primary loop emergency water replenishing diesel engine pump set and a system for a nuclear power plant.

Background

The emergency water-replenishing diesel engine pump of the primary loop is used for being put into operation within 2.5 hours after an accident, replenishing water to the primary loop and cooling the reactor core; the diesel engine drives the rotation of the rotor, drives the rotation of the pump rotor through the speed increasing box and the coupling, and continuously transmits energy to the conveying liquid (water or water containing boron) by means of the power action of the rotating impeller on the liquid, so that the kinetic energy (mainly) and the pressure energy of the liquid are increased, and then the kinetic energy is converted into the pressure energy through the extrusion chamber of the pump cavity, when the liquid is thrown out from the impeller, the central part of the impeller causes a low-pressure area to form a pressure difference with the pressure of the sucked liquid surface, so that the liquid is continuously sucked and discharged at a certain pressure, and the liquid is continuously conveyed out.

When a loop is destroyed, natural circulation can be established to the reactor core under the condition, through the manual one loop atmosphere blow-off valve that opens, rely on steam generator to discharge the reactor core waste heat, the atmosphere blow-off valve is opened the back, and steam generator secondary side cooling water can lose in a large number, need be to steam generator secondary side moisturizing this moment to guarantee the long-term cooling of reactor core. In order to realize continuous water replenishing of the steam generator under the condition of long-term power loss, corresponding water replenishing facilities and modes are required to be arranged. If the steam pressure of the steam generator can maintain the operation of the steam pump of the auxiliary water supply system of the steam generator under the accident condition, an emergency water supplement measure needs to be added for the auxiliary water supply tank, water can be continuously supplemented, and the requirement of water supplement amount is met. And along with the development of the accident, steam pressure that steam generator produced probably can't continue to promote the steam-operated supplementary water feed pump, and electronic supplementary water feed pump also can't obtain the power supply simultaneously, even carry out the moisturizing through supplementary water feed tank newly-increased emergent moisturizing passageway and also can't realize steam generator's moisturizing operation to supplementary water tank this moment to the waste heat discharge of reactor core can't be realized. Therefore, in this case, an emergency water replenishing channel for directly replenishing water to the steam generator needs to be added, and the emergency water replenishing channel has a function of continuously replenishing water, so as to ensure the water level of the secondary side of the steam generator, and manually open the atmospheric vent valve to exhaust the residual heat of the reactor core in the manner of exhausting the atmosphere by the steam turbine bypass system.

In view of the above two points, a primary circuit emergency water supplementing diesel engine pump set and a system for a nuclear power plant need to be designed, and a proper mode is adopted for water supplementing, so that the accident expansion is avoided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a nuclear power plant is with emergent moisturizing diesel engine pump package of return circuit and system for solve emergent moisturizing device and need alternating current power supply to start, but the power is whole to be inefficacy when meeting with earthquake conflagration scheduling problem, the unable problem that starts of emergent moisturizing device.

The purpose of the utility model can be realized by the following technical scheme:

a nuclear power plant is with emergent moisturizing diesel engine pump package and system of a return circuit, including the diesel engine pump, the said diesel engine pump is installed in carriage, one end of the said diesel engine pump has pump heads, the said pump head couples to diaphragm coupling, another end of the said diaphragm coupling couples to diesel engine;

the diesel engine pump is characterized in that a pump water inlet pipe is arranged at one end, close to a pump head, of the diesel engine pump, the other end of the pump water inlet pipe is connected with a loop emergency water replenishing pump water tank, a pump water outlet pipe is arranged at one end, far away from the pump head, of the pump water inlet pipe, the other end of the pump water outlet pipe is connected with a switching water valve, the other end of the switching water valve is connected with a pressure reducing valve water inlet pipe, the other end of the pressure reducing valve water inlet pipe is connected with a high-pressure reducing valve, the other end of the high-pressure reducing valve is connected with a pressure transmitter, the other; a pressure relief water pipe is arranged between the water outlet pipe of the pump and the water outlet pipe of the regulating valve; the pressure relief water pipe is connected with a pressure relief valve water inlet pipe.

Further, the water tank of the primary loop emergency water replenishing pump is provided with a first ball valve and a second ball valve; a water tank water replenishing pipeline is arranged on one side, close to the second ball valve, of the primary loop emergency water replenishing pump water tank;

the emergency water replenishing pump is characterized in that a water tank of the primary loop emergency water replenishing pump is mounted on a water tank support, the water tank support is fixed in a carriage, the diesel engine is mounted on a support frame, the support frame is fixed on a fixing plate, the fixing plate is mounted on a base and provided with a through hole, a diesel engine fan is arranged at one end, close to the through hole, of the diesel engine, and the diesel engine fan is located in the through hole;

the diesel engine is connected with an engine control box through a circuit; the diesel engine is connected with the oil tank through an oil pipe;

the bottom end of the regulating valve water outlet pipe is sequentially provided with an electromagnetic flowmeter and a flowmeter water outlet pipe;

the pressure reducing valve water inlet pipe, the high-pressure reducing valve, the pressure transmitter, the pressure reducing valve water outlet pipe, the outlet adjusting valve and the adjusting valve water outlet pipe are independent pieces, and the pressure reducing valve water inlet pipe, the high-pressure reducing valve, the pressure transmitter, the pressure reducing valve water outlet pipe, the outlet adjusting valve and the adjusting valve water outlet pipe are fixedly connected together through bolts; flange graphite gaskets are arranged among the installation surfaces of the pressure reducing valve water inlet pipe, the high-pressure reducing valve, the pressure transmitter, the pressure reducing valve water outlet pipe, the outlet adjusting valve and the adjusting valve water outlet pipe;

the diesel engine pump is installed on the base, the base is installed in the carriage, and the base is provided with a drainage hole which is inclined downwards.

Furthermore, the diesel engine pump comprises a shaft, a flat key is arranged on the shaft, one end of the shaft sequentially penetrates through the water outlet end dustproof disc, the water outlet end bearing frame and the outlet end bearing gland, one end of the shaft penetrating through the water outlet end dustproof disc, the water outlet end bearing frame and the outlet end bearing gland is embedded into the fan, one end of the fan far away from the outlet end bearing gland is provided with a fan cover, and the fan cover is fixed on the shell through bolts;

the shell is provided with a tension bolt, the water outlet end bearing frame is provided with a tapered roller bearing, and one side of the tapered roller bearing is sequentially provided with a bearing retainer ring, a bearing pressure ring pad and a bearing pressure ring;

and an air release plug is arranged at one end of the water outlet end bearing frame, which is far away from the fan.

Furthermore, the other end of the shaft sequentially penetrates through the water inlet end dustproof disc, the water inlet end bearing frame, the driving end bearing cover pad and the driving end bearing cover; and a cylindrical roller bearing is arranged in the bearing frame at the water inlet end.

Further, one side of the water inlet end bearing frame is provided with a water inlet section, the water inlet section is connected with the shell, the bottom end of the water inlet section is provided with a primary sealing ring, one side of the primary sealing ring is provided with a primary impeller, and the primary impeller is arranged corresponding to the flat key.

Furthermore, a plurality of secondary impellers are arranged on one side, away from the primary sealing ring, of the primary impeller, and the secondary impellers are arranged corresponding to the flat keys;

a last stage guide vane and a second stage guide vane are arranged at one end of the second stage impeller, which is far away from the first stage impeller; a throttling sleeve is arranged at one end of the last stage guide vane far away from the second stage guide vane, and a shaft sleeve is arranged between the throttling sleeve and the shaft; the throttling sleeve divides the diesel engine pump into a tail section and a middle section.

Furthermore, the lower end of the last stage guide vane is provided with a middle pipeline, and the other end of the middle pipeline is connected to the tail section;

a tail section shaft sleeve is arranged on one side, close to the middle pipeline, of the water outlet end bearing frame, a tail section throttling sleeve is arranged at one end of the tail section shaft sleeve, a reverse secondary impeller is arranged on one side of the tail section throttling sleeve, a reverse secondary guide vane is arranged at the lower end of the reverse secondary impeller, and the reverse secondary guide vane is arranged corresponding to the flat key; one side that anti secondary stator is close to the section of intaking is equipped with back final stage stator, one side of returning the final stage stator is equipped with out the water section, it links to each other with the casing to go out the water section.

Further, the specific adjusting process of the primary circuit emergency water replenishing diesel engine pump set and the system is as follows:

filling water into a primary circuit emergency water replenishing pump water tank (9) until all water storage units in a diesel engine pump set and the primary circuit emergency water replenishing pump water tank (9) are completely filled with water;

the working condition I is as follows: simultaneously closing the 1#, 2#, and 3# adjusting valves, and starting the diesel engine when the 1#, 2#, and 3# adjusting valves are closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 1250 revolutions per minute; at the moment, the 3# valve is slowly opened, the lift value reaches 165m, and the flow is 15m³/h；

Working conditions are as follows: simultaneously closing the 1#, 2#, 3# regulating valves, and starting the diesel engine when the 1#, 2#, 3# regulating valves are closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 1500 revolutions per minute; at the moment, the 3# valve is slowly opened, the lift value reaches 195m, and the flow rate is 30m³/h；

Working conditions are as follows: simultaneously closing the 1#, 2#, and 3# adjusting valves, and starting the diesel engine when the 1#, 2#, and 3# adjusting valves are all closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 2950 revolutions per minute; the 3# valve is slowly opened at the moment, and the lift value reaches 900m at the moment; the flow rate is 45m³/h；

Working conditions are as follows: simultaneously closing the 1#, 2#, and 3# adjusting valves, and starting the diesel engine when the 1#, 2#, and 3# adjusting valves are all closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 2950 revolutions per minute; opening the 1# valve to 2/3 degrees, wherein the lift value reaches 300 m; the flow rate is 45m³/h；

Working condition five: simultaneously closing the 1#, 2#, 3# regulating valves, and starting the diesel engine when the 1#, 2#, 3# regulating valves are closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 2800 revolutions per minute; at the moment, the 1# valve is opened to 2/3 degrees of opening, the lift value reaches 246m, and the flow rate is 45m³/h。

Compared with the prior art, the beneficial effects of the utility model are that:

a loop emergency water-replenishing diesel engine pump set system mainly comprises a horizontal multistage centrifugal pump, a diesel engine (with a speed increasing box), an inlet water tank, a coupler, an outlet adjusting valve, an outlet pressure reducing valve, an outlet flowmeter, an inlet pressure gauge, an outlet pressure transmitter, inlet and outlet metal hoses, inlet and outlet pipelines and the like, wherein the diesel engine and a pump are both arranged on an integrated base, a pump head and the diesel engine speed increasing box are connected by adopting a diaphragm coupler, the whole set of pump set system is arranged inside a carriage, so that the problem that the emergency water-replenishing diesel engine pump set system depends on an emergency power supply is reduced, when a disaster occurs, the emergency power supply fails in time, the emergency water-replenishing diesel engine pump set system can still work, and meanwhile, the emergency water-replenishing diesel engine pump set system is arranged in the carriage, so that the moving convenience of the emergency;

the emergency water replenishing pump set of the primary loop is a horizontal sectional type multistage centrifugal pump, the supporting mode of the pump is a central support, two ends of the pump are supported by rolling bearings, wherein the tail end support adopts double-row roller bearings (mainly bearing axial force and radial force), the driving end adopts single-row roller bearings (mainly bearing radial force), and the rolling bearings are respectively arranged in supporting frames at two ends of the pump.

The inlet and the outlet are both positioned on the upper part of the pump set, the inlet is connected to the inlet water tank, the outlet is connected with the regulating valve system, and the inlet and the outlet of the pump are both arranged on the left side surface of the carriage (seen from the tail part of the carriage to the head direction).

The rated maximum lift of a loop emergency water replenishing pump set reaches 900m (12-grade impellers in total), and for effectively balancing axial force, the impellers of the pump are designed in a back-to-back layout according to 6 grades in the left direction and 6 grades in the right direction. The front 6-stage impeller is positioned on one side of the water inlet section and gradually reaches the 6 th-stage impeller close to the middle part of the pump, and the pressure water is communicated with the backward 6-stage reverse secondary impeller through the middle pipe and then gradually reaches the 12 th stage (the water outlet section positioned in the middle part of the pump), so that the reverse balance of the hydraulic axial force of the front 6 stage and the back 6 stage can be realized, and the good service life of the pump is ensured.

The bearing lubrication mode is as follows: oil lubrication is adopted.

The bearing chamber gland of both ends designs dustproof disk structure to prevent dust or other impurity entering bearing chamber, outside bearing chamber of both ends, is equipped with oil level window and constant position oil cup to observe lubricating oil level and automatic supplementary lubricating oil.

The shaft seal of the pump adopts single end face balance type integrated mechanical seal. Two groups of mechanical seals are respectively arranged in the sealing cavities which are symmetrical to the two sides of the shell. Machine seal washing and cooling mode: the first-stage shell part is connected with a flushing pipe which is respectively communicated with the pipe nozzle positions of the two side sealing cavities, and flushing and cooling liquid of the mechanical seal is working liquid of the pump.

The pump set system is provided with sensors for detecting the temperature of a pump bearing, the pressure of an outlet of the pump and the flow of the outlet of the pump, and the sensors are all wired into a local control system of the pump, so that the operation condition of the pump can be monitored in real time.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a front view of a primary emergency water diesel engine pump unit system;

FIG. 2 is a cross-sectional view of a diesel engine pump;

FIG. 3 is a top view of a primary circuit emergency water supplement diesel engine pump set system;

fig. 4 is a flow chart of the pump unit operation.

In the figure: 1. a fan housing; 2. a bearing ring pad; 3. a bearing frame at the water outlet end; 4. a gas release plug; 5. a water outlet end dustproof plate; 6. tightening the bolts; 7. a water inlet pipe of the water tank; 8. a pump water inlet pipe; 9. a water tank of a primary emergency water replenishing pump; 10. a last stage; 11. a counter-secondary impeller; 12. a counter-secondary vane; 13. a flat bond; 14. a pressure vacuum gauge; 15. a pump-out water pipe; 16. a pressure reducing valve water inlet pipe; 17. a high pressure relief valve; 18. a last stage guide vane; 19. switching on and off a water valve; 20. a pressure transmitter; 21. a water outlet pipe of the pressure reducing valve; 22. a secondary guide vane; 23. an outlet regulating valve; 24. a first stage impeller; 25. a primary seal ring; 26. a water inlet section; 27. a water outlet pipe of the regulating valve; 28. an electromagnetic flow meter; 29. a cartridge type mechanical seal; 30. a dustproof disc at the water inlet end; 31. a cylindrical roller bearing; 32. a water outlet pipe of the flowmeter; 33. a drive end bearing gland; 34. a diaphragm coupling; 35. a pump head; 36. a shaft; 37. a water inlet end bearing frame; 38. a first ball valve; 39. an intermediate pipeline; 40. a throttling sleeve; 41. a shaft sleeve; 42. a second ball valve; 43. a last stage throttling sleeve; 44. a tail section shaft sleeve; 45. a hydrophobic pore; 46. a tapered roller bearing; 47. a bearing retainer ring; 48. bearing compression rings; 49. an outlet end bearing gland; 50. a fan.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1-4, a loop emergency water-replenishing diesel engine pump set and system for a nuclear power plant comprises a diesel engine pump, wherein a pump head 35 is arranged at one end of the diesel engine pump, the pump head 35 is connected with a diaphragm coupling 34, and the other end of the diaphragm coupling 34 is connected with a diesel engine;

one end of the diesel engine pump close to the pump head 35 is provided with a pump inlet pipe 8, the other end of the pump inlet pipe 8 is connected with a primary circuit emergency water supplementing pump water tank 9, the primary circuit emergency water supplementing pump water tank 9 is a vacuum self-suction water tank, when the pump set is started, water can be conveyed into a water outlet pipeline in a short time, meanwhile, when a disaster happens to the primary circuit emergency water supplementing pump water tank 9, namely when the suction pressure is negative (when the water supply pipeline cannot provide positive pressure), the pump set is started, water can be conveyed into the water outlet pipeline in a short time, one end of the pump inlet pipe 8 far away from the pump head 35 is provided with a pump outlet pipe 15, the other end of the pump outlet pipe 15 is connected with a switch water valve 19, the other end of the switch water valve 19 is connected with a pressure reducing valve inlet pipe 16, the other end of, the other end of the pressure transmitter 20 is connected with a pressure reducing valve water outlet pipe 21, the other end of the pressure reducing valve water outlet pipe 21 is connected with an outlet adjusting valve 23, and the other end of the outlet adjusting valve 23 is connected with an adjusting valve water outlet pipe 27; a pressure relief water pipe is arranged between the water outlet pipe 15 of the pump and the water outlet pipe 27 of the regulating valve; the pressure relief water pipe is connected with a pressure relief valve water inlet pipe 16; the pressure transmitter 20 is specifically of the type PT 401.

The first ball valve 38 and the second ball valve 42 are arranged on the primary loop emergency water replenishing pump water tank 9; a water tank water replenishing pipeline is arranged on one side, close to the second ball valve 42, of the primary loop emergency water replenishing pump water tank 9;

a water tank 9 of a primary loop emergency water replenishing pump is arranged on the water tank bracket;

the diesel engine is arranged in the supporting frame, the supporting frame is fixed on the fixing plate, the fixing plate is provided with a through hole, the through hole is arranged opposite to the diesel engine fan, the other side of the through hole is provided with a ventilation net, and the ventilation net is arranged opposite to the diesel engine fan;

the diesel engine is connected with the engine control box through a circuit; the diesel engine is connected with the oil tank through an oil pipe;

the bottom end of the regulating valve water outlet pipe 27 is sequentially provided with an electromagnetic flowmeter 28 and a flowmeter water outlet pipe 32;

the pressure reducing valve water inlet pipe 16, the high-pressure reducing valve 17, the pressure transmitter 20, the pressure reducing valve water outlet pipe 21, the outlet regulating valve 23 and the regulating valve water outlet pipe 27 are independent pieces and are fixedly connected together through bolts; flange graphite gaskets are arranged among the installation surfaces of the pressure reducing valve water inlet pipe 16, the high-pressure reducing valve 17, the pressure transmitter 20, the pressure reducing valve water outlet pipe 21, the outlet adjusting valve 23 and the adjusting valve water outlet pipe 27;

the diesel engine pump is installed on the base, and the base is provided with a downward inclined drainage hole 45.

The diesel engine pump comprises a shaft 36, a flat key 13 is arranged on the shaft 36, one end of the shaft 36 penetrates through a water outlet end dustproof disc 5, a water outlet end bearing frame 3 and an outlet end bearing gland 49 in sequence to be embedded into a fan 50, a fan cover 1 is arranged at one end, far away from the outlet end bearing gland 49, of the fan 50, and the fan cover 1 is fixed on a shell through bolts

The shell is provided with a tension bolt 6, the water outlet end bearing frame 3 is provided with a tapered roller bearing 46, and one side of the tapered roller bearing 46 is sequentially provided with a bearing retainer ring 47, a bearing press ring pad 2 and a bearing press ring 48;

an air release plug 4 is arranged at one end of the water outlet end bearing frame 3 far away from the fan 50;

the other end of the shaft 36 sequentially penetrates through the water inlet end dustproof disc 30, the water inlet end bearing frame 37, the driving end bearing cover pad and the driving end bearing cover 33;

a cylindrical roller bearing 31 is arranged in the bearing frame 37 at the water inlet end;

a water inlet section 26 is arranged on one side close to the water inlet end bearing frame 37, the water inlet section 26 is connected with the shell, a first-stage sealing ring 25 is arranged at the bottom end of the water inlet section 26, a first-stage impeller 24 is arranged on one side of the first-stage sealing ring 25, and the first-stage impeller 24 is arranged corresponding to the flat key 13;

a plurality of secondary impellers are arranged on one side of the primary impeller 24, which is far away from the primary sealing ring 25, and the secondary impellers are arranged corresponding to the flat keys 13;

a last stage guide vane 18 and a second stage guide vane 22 are arranged at one end of the second stage impeller far away from the first stage impeller 24; a throttling sleeve 40 is arranged at one end of the last stage guide vane 18 far away from the second stage guide vane 22, and a shaft sleeve 41 is arranged between the throttling sleeve 40 and the shaft 36;

the throttle sleeve 40 divides the diesel engine pump into an end section 10 and a middle section;

the lower end of the last stage guide vane 18 is provided with a middle pipeline 39, and the other end of the middle pipeline 39 is connected to the tail stage 10;

a tail section shaft sleeve 44 is arranged on one side of the water outlet end bearing frame 3 close to the middle pipeline 39, a tail section throttling sleeve 43 is arranged at one end of the tail section shaft sleeve 44, a reverse secondary impeller 11 is arranged on one side of the tail section throttling sleeve 43, a reverse secondary guide vane 12 is arranged at the lower end of the reverse secondary impeller 11, and the reverse secondary guide vane 12 is arranged corresponding to the flat key 13; and a final stage return guide vane is arranged on one side of the reverse secondary guide vane 12 close to the water inlet section 26, a water outlet section is arranged on one side of the final stage return guide vane, and the water outlet section is connected with the shell.

The utility model discloses when specifically implementing: the primary loop emergency water-replenishing diesel engine pump set system mainly comprises a horizontal multistage centrifugal pump, a diesel engine auxiliary speed increasing box, an inlet water tank, a coupler, an outlet adjusting valve 23, an outlet pressure reducing valve, an outlet flowmeter, a pressure vacuum gauge 14, a water tank water inlet pipe 7, inlet and outlet metal hoses, inlet and outlet pipelines and the like, wherein the diesel engine and the pump are both arranged on an integrated base, a pump head 35 is connected with the diesel engine speed increasing box through a diaphragm coupler, and the whole set of pump set system is arranged inside a carriage;

the emergency water replenishing pump set of the primary loop is a horizontal sectional type multistage centrifugal pump, the supporting mode of the pump is a central support, two ends of the pump are supported by rolling bearings, wherein the tail end of the pump is supported by double-row roller bearings which mainly bear axial force and radial force of a shaft 36, the driving end of the pump is supported by a single-row roller bearing 36 which mainly bears radial force, and the rolling bearings are respectively arranged in supporting frames at two ends of the pump.

The inlet and the outlet are positioned on the upper part of the pump set, the inlet is connected to the inlet water tank, the outlet is connected with the regulating valve system, and the inlet and the outlet of the pump are all arranged on the left side surface of the carriage and are seen from the tail part of the carriage to the head direction.

The rated maximum lift of a loop emergency water replenishing pump set reaches twelve stages of impellers of 900m, and in order to effectively balance axial force, the impellers of the pump are designed in a back-to-back layout according to six stages in the left direction and six stages in the right direction. The front six-stage impeller is positioned on one side of the water inlet section 26 and gradually reaches the sixth-stage impeller close to the middle part of the pump, and the pressure water is communicated with the backward six-stage reverse secondary impeller 11 through the middle pipe and then gradually reaches the twelfth-stage water outlet section positioned in the middle part of the pump, so that the reverse balance of the hydraulic axial force of the front six stages and the backward six stages can be realized, and the good service life of the pump is ensured; the bearing lubrication adopts an oil lubrication mode.

The bearing chamber gland of both ends designs dustproof disk structure to prevent dust or other impurity entering bearing chamber, outside bearing chamber of both ends, is equipped with oil level window and constant position oil cup to observe lubricating oil level and automatic supplementary lubricating oil.

The shaft seal of the pump adopts a single end face balance type integrated mechanical seal 29. Two groups of mechanical seals are respectively arranged in the sealing cavities which are symmetrical to the two sides of the shell. Machine seal washing and cooling mode: the first-stage shell part is connected with a flushing pipe which is respectively communicated with the pipe nozzle positions of the two side sealing cavities, and flushing and cooling liquid of the mechanical seal is working liquid of the pump.

The pump set system is provided with sensors for detecting the temperature of a pump bearing, the pressure of an outlet of the pump and the flow of the outlet of the pump, and the sensors are all wired into a local control system of the pump, so that the operation condition of the pump can be monitored in real time.

Rotation direction of the pump: the direction of rotation is clockwise as viewed from the drive end of the pump.

Referring to fig. 2 to 4, the operation method of the primary emergency water-replenishing diesel engine pump set includes:

operating point 1: flow rate: 15m³H; lift: 165 m;

the method comprises the following operation steps:

1, checking and ensuring that the pump set and the inlet water tank are filled with water and the pump has a starting condition;

2, closing 1#, 2#, 3# regulating valves;

3 starting the diesel engine, and slowly adjusting the diesel engine to enable the rotating speed of the speed increasing gear box to reach about 1250 revolutions per minute;

4 slowly opening the 3# valve, observing the flow on the display meter of the flowmeter until the flow reaches the specified 15m³The lift value under the flow is about 165m, and if a little deviation exists, the rotation speed of the diesel engine can be adjusted;

operating point 2: flow rate: 30m³H; the lift is 195 m;

the method comprises the following operation steps:

1, checking and ensuring that the pump set and the inlet water tank are filled with water and the pump has a starting condition;

2, closing 1#, 2#, 3# regulating valves;

3 starting the diesel engine, and slowly adjusting the diesel engine to enable the rotating speed of the speed-increasing gearbox to reach about 1500 revolutions per minute;

4 slowly opening the 3# valve, observing the flow on the display meter of the flowmeter until the flow reaches the specified 30m³The lift value under the flow is about 195m, and if a little deviation exists, the flow can be realized by adjusting the rotating speed of the diesel engine;

operating point 3: flow rate: 45m³H; the lift is 900 m;

the method comprises the following operation steps:

1, checking and ensuring that the pump set and the inlet water tank are filled with water and the pump has a starting condition;

2, closing 1#, 2#, 3# regulating valves;

3 starting the diesel engine, and slowly adjusting the diesel engine to enable the rotating speed of the speed-increasing gearbox to be about 2950 revolutions per minute;

4 slowly opening the 3# valve, observing the flow on the display meter of the flowmeter until the flow reaches the specified 45m³The lift value under the flow is about 900m, and if a small deviation exists, the rotation speed of the diesel engine can be adjusted.

Operating point 4: flow rate: 45m³H; lift: 300 m;

the method comprises the following operation steps:

1, checking and ensuring that the pump set and the inlet water tank are filled with water and the pump has a starting condition;

2, closing 1#, 2#, 3# regulating valves;

3 starting the diesel engine, and slowly adjusting the diesel engine to enable the rotating speed of the speed-increasing gearbox to be about 2950 revolutions per minute;

4 opening the 1# valve to about 2/3 degree, then slowly opening the 2# valve, observing the flow on the display meter of the flowmeter until the specified flow reaches 45m³The lift value under the flow is about 300m, and if a small deviation exists, the rotation speed of the diesel engine can be adjusted.

Operating point 5: flow rate: 45m³H; lift: 246 m;

the method comprises the following operation steps:

1, checking and ensuring that the pump set and the inlet water tank are filled with water and the pump has a starting condition;

2, closing 1#, 2#, 3# regulating valves;

3 starting the diesel engine, and slowly adjusting the diesel engine to enable the rotating speed of the speed-increasing gearbox to reach about 2800 revolutions per minute;

4 opening the 1# valve to about 2/3 degree, observing the flow on the display meter of the flowmeter until the specified 45m³The lift value at this flow rate is about 246m, and if there is a little deviation, the lift value can be realized by adjusting the rotating speed of the diesel engine.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (8)

1. A nuclear power plant is with emergent moisturizing diesel engine pump package and system of a return circuit, includes the diesel engine pump, characterized by that, the said diesel engine pump is installed in carriage, one end of the said diesel engine pump has pump heads (35), the said pump head (35) couples to diaphragm coupling (34), another end of the said diaphragm coupling (34) couples to diesel engine;

one end of the diesel engine pump close to the pump head (35) is provided with a pump water inlet pipe (8), the other end of the pump water inlet pipe (8) is connected with a loop emergency water replenishing pump water tank (9), a pump outlet pipe (15) is arranged at one end of the pump inlet pipe (8) far away from the pump head (35), the other end of the pump water outlet pipe (15) is connected with a switch water valve (19), the other end of the switch water valve (19) is connected with a pressure reducing valve water inlet pipe (16), the other end of the pressure reducing valve water inlet pipe (16) is connected with a high-pressure reducing valve (17), the other end of the high-pressure decompression valve (17) is connected with a pressure transmitter (20), the other end of the pressure transmitter (20) is connected with a pressure reducing valve water outlet pipe (21), the other end of the pressure reducing valve water outlet pipe (21) is connected with an outlet regulating valve (23), the other end of the outlet regulating valve (23) is connected with a regulating valve water outlet pipe (27); a pressure relief water pipe is arranged between the pump water outlet pipe (15) and the regulating valve water outlet pipe (27); the pressure relief water pipe is connected with a pressure relief valve water inlet pipe (16).

2. The nuclear power plant primary circuit emergency water replenishing diesel engine pump set and system as claimed in claim 1, wherein the primary circuit emergency water replenishing pump water tank (9) is provided with a first ball valve (38) and a second ball valve (42); a water tank water replenishing pipeline is arranged on one side, close to the second ball valve (42), of the primary loop emergency water replenishing pump water tank (9);

the emergency water replenishing pump water tank (9) of the primary loop is mounted on a water tank support, the water tank support is fixed in a carriage, the diesel engine is mounted on a support frame, the support frame is fixed on a fixing plate, the fixing plate is mounted on a base, a through hole is formed in the fixing plate, a diesel engine fan is arranged at one end, close to the through hole, of the diesel engine, and the diesel engine fan is located in the through hole;

the diesel engine is connected with an engine control box through a circuit; the diesel engine is connected with the oil tank through an oil pipe;

the bottom end of the regulating valve water outlet pipe (27) is sequentially provided with an electromagnetic flowmeter (28) and a flowmeter water outlet pipe (32);

the pressure reducing valve water inlet pipe (16), the high-pressure reducing valve (17), the pressure transmitter (20), the pressure reducing valve water outlet pipe (21), the outlet adjusting valve (23) and the adjusting valve water outlet pipe (27) are independent pieces, and the pressure reducing valve water inlet pipe (16), the high-pressure reducing valve (17), the pressure transmitter (20), the pressure reducing valve water outlet pipe (21), the outlet adjusting valve (23) and the adjusting valve water outlet pipe (27) are fixedly connected together through bolts; flange graphite gaskets are arranged among the installation surfaces of the pressure reducing valve water inlet pipe (16), the high-pressure reducing valve (17), the pressure transmitter (20), the pressure reducing valve water outlet pipe (21), the outlet adjusting valve (23) and the adjusting valve water outlet pipe (27);

the diesel engine pump is installed on the base, the base is installed in the carriage, and the base is provided with a downward inclined drainage hole (45).

3. The pump set and the system of the loop emergency water-replenishing diesel engine for the nuclear power plant as claimed in claim 2, wherein the diesel engine pump comprises a shaft (36), the shaft (36) is provided with a flat key (13), one end of the shaft (36) sequentially penetrates through a water outlet end dust-proof disc (5), a water outlet end bearing frame (3) and an outlet end bearing gland (49), one end of the shaft (36) penetrating through the water outlet end dust-proof disc (5), the water outlet end bearing frame (3) and the outlet end bearing gland (49) is embedded into a fan (50), one end of the fan (50) far away from the outlet end bearing gland (49) is provided with a fan cover (1), and the fan cover (1) is fixed on the shell through bolts;

the water outlet end bearing frame (3) is provided with a tapered roller bearing (46), and one side of the tapered roller bearing (46) is sequentially provided with a bearing retainer ring (47), a bearing press ring pad (2) and a bearing press ring (48);

and an air release plug (4) is arranged at one end of the water outlet end bearing frame (3) far away from the fan (50).

4. The nuclear power plant primary circuit emergency water replenishing diesel engine pump set and system as claimed in claim 3, wherein the other end of the shaft (36) sequentially penetrates through the water inlet end dustproof disc (30), the water inlet end bearing frame (37), the drive end bearing cover pad and the drive end bearing cover (33); the bearing frame (37) at the water inlet end is internally provided with a cylindrical roller bearing (31).

5. The nuclear power plant primary circuit emergency water replenishing diesel engine pump set and system as claimed in claim 4, wherein a water inlet section (26) is arranged on one side of the water inlet end bearing frame (37), the water inlet section (26) is connected with the shell, a primary sealing ring (25) is arranged at the bottom end of the water inlet section (26), a primary impeller (24) is arranged on one side of the primary sealing ring (25), and the primary impeller (24) is arranged corresponding to the flat key (13).

6. The pump set and the system for the primary circuit emergency water replenishing diesel engine for the nuclear power plant are characterized in that a plurality of secondary impellers are arranged on one side, away from a primary sealing ring (25), of the primary impeller (24), and the secondary impellers are arranged corresponding to the flat keys (13);

a last stage guide vane (18) and a secondary stage guide vane (22) are arranged at one end of the secondary impeller, which is far away from the primary impeller (24); a throttling sleeve (40) is arranged at one end, far away from the secondary guide vane (22), of the last stage guide vane (18), and a shaft sleeve (41) is arranged between the throttling sleeve (40) and the shaft (36); the throttle sleeve (40) divides the diesel engine pump into an end section (10) and a middle section.

7. The nuclear power plant primary circuit emergency water replenishing diesel engine pump set and system as claimed in claim 6, characterized in that the lower end of the last stage guide vane (18) is provided with an intermediate pipeline (39), and the other end of the intermediate pipeline (39) is connected to the end section (10);

an end section shaft sleeve (44) is arranged on one side, close to the middle pipeline (39), of the water outlet end bearing frame (3), an end section throttling sleeve (43) is arranged at one end of the end section shaft sleeve (44), a reverse secondary impeller (11) is arranged on one side of the end section throttling sleeve (43), a reverse secondary guide vane (12) is arranged at the lower end of the reverse secondary impeller (11), and the reverse secondary guide vane (12) is arranged corresponding to the flat key (13); one side that anti secondary stator (12) is close to into water section (26) is equipped with back final stage stator, one side of returning the final stage stator is equipped with out the water section, it links to each other with the casing to go out the water section.

8. The primary circuit emergency water replenishing diesel engine pump set and system for the nuclear power plant according to claim 1, wherein the specific adjusting process of the primary circuit emergency water replenishing diesel engine pump set and system is as follows:

filling water into a primary circuit emergency water replenishing pump water tank (9) until all water storage units in a diesel engine pump set and the primary circuit emergency water replenishing pump water tank (9) are completely filled with water;

the working condition I is as follows: simultaneously closing the 1#, 2#, and 3# adjusting valves, and starting the diesel engine when the 1#, 2#, and 3# adjusting valves are closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 1250 revolutions per minute; at the moment, the 3# valve is slowly opened, the lift value reaches 165m, and the flow is 15m³/h；

Working conditions are as follows: simultaneously closing the 1#, 2#, 3# regulating valves, and starting the diesel engine when the 1#, 2#, 3# regulating valves are closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 1500 revolutions per minute; at the moment, the 3# valve is slowly opened, the lift value reaches 195m, and the flow rate is 30m³/h；

Working conditions are as follows: simultaneously closing the 1#, 2#, and 3# adjusting valves, and starting the diesel engine when the 1#, 2#, and 3# adjusting valves are all closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 2950 revolutions per minute; the 3# valve is slowly opened at the moment, and the lift value reaches 900m at the moment; the flow rate is 45m³/h；

Working conditions are as follows: simultaneously closing the 1#, 2#, and 3# adjusting valves, and starting the diesel engine when the 1#, 2#, and 3# adjusting valves are all closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 2950 revolutions per minute; opening the 1# valve to 2/3 degrees, and then opening the 2# valve, wherein the lift value reaches 300 m; the flow rate is 45m³/h；

Working condition five: simultaneously closing the 1#, 2#, 3# regulating valves, and starting the diesel engine when the 1#, 2#, 3# regulating valves are closed, wherein the rotating speed of the speed increasing gearbox of the diesel engine is 2800 revolutions per minute; at the moment, the 1# valve is opened to 2/3 degrees of opening, the lift value reaches 246m, and the flow rate is 45m³/h。

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