CN207406476U - Female footballer and main feed pump system - Google Patents

Abstract

The utility model relates to the technical field of feedwater heating systems for million-kilowatt nuclear power plants, and provides a heating pump system and a main feedwater pump system. The main feed water pump system includes deaerator, standby electric pump set, main pipe, steam generator, recirculation pipeline and heating pump system, and the standby electric pump set includes the front pump connected to the deaerator and the pressure pump connected to the main pipe. stage pump, and the other end of the main pipe is connected with the steam generator. The heat pump system includes a first heat pump water supply pipeline and a second heat pump water supply pipeline arranged at intervals from the recirculation pipeline. One end of the first heat pump water supply pipeline is connected to the main pipe, and the other end is connected to the front pump. One end of the water supply line is connected to the main pipe, and the other end is connected to the pressure stage pump. The warm pump water flows directly into the front pump through the first warm pump water supply pipeline, and directly flows into the pressure stage pump through the second warm pump water supply pipeline, avoiding the situation of being shunted by the recirculation pipeline, and ensuring that the front pump and the pressure stage pump are Can achieve a good heat pump effect.

Description

Heat pump system and main feed water pump system

technical field

The utility model relates to the technical field of feedwater heating systems of mega-kilowatt nuclear power plants, in particular to a heating pump system and a main feedwater pump system.

Background technique

The main feed water pump system mainly includes a deaerator, three parallel electric pump sets and a steam generator. The electric pump set is used to boost the feed water of the deaerator and supply it to the secondary side of the steam generator. Under normal circumstances, two electric pump sets are put into operation, and one electric pump set is in standby. Each electric pump set mainly includes a front pump, a motor, a hydraulic coupler and a pressure stage pump arranged in series. One end of the motor directly drives the front pump, and the other end drives the pressure stage pump through a hydraulic coupler and a gearbox. The feed water of the deaerator enters the front pump through the downcomer, then enters the pressure stage pump through the jumper pipe, and finally enters the steam generator through the outlet check valve and the electric isolation valve. There is also a recirculation pipeline combined with the deaerator between the pressure stage pump and the outlet check valve to ensure the safe operation of the electric pump set under low flow conditions.

When any one of the normally operating electric pump sets fails, it is necessary to put into use the spare electric pump set. In order to prevent damage to the pump body due to excessive temperature difference, the standby electric pump set should always be in a warm pump state before it is put into operation, so that it can be put into operation quickly at any time. In the traditional heat pump system, the heat pump water will be divided into two paths after passing through the isolation valve, which are the pre-pump and the pressure-stage pump heat pump. However, the warm pump water flowing to the pressure stage pump will pass through the inlet of the recirculation pipeline, so that the warm pump water is easily diverted by the recirculation pipeline, resulting in insufficient flow of warm pump water flowing into the pressure stage pump, and thus cannot guarantee the protection of the pressure stage pump. Heat pump effect. .

Utility model content

Based on this, it is necessary to provide a heat pump system and a main feed water pump system that can evenly heat pump for the problem of poor heat pump effect of the traditional heat pump system.

A warm pump system, used to provide warm pump water to the front pump and the pressure stage pump in the main feed water pump system, the main feed water pump system also includes a main pipe connected to the pressure stage pump at one end, and connected to the pressure stage pump The deaerator connected to the front pump and the recirculation pipeline connected to the main pipe and the deaerator at both ends, and the warm pump system includes:

The first heating pump water supply pipeline includes a first input end and a first output end oppositely arranged, the first input end is connected to the main pipe, and the first output end is used to connect to the pre-pump, the first warm pump water supply line is spaced apart from the recirculation line; and

The second heating pump water supply pipeline includes a second input end and a second output end oppositely arranged, the second input end is connected to the main pipe, and the second output end is used to connect to the pressure stage pump, The second warm pump water supply line is spaced apart from the recirculation line.

The above-mentioned warm pump system is provided with independent first warm pump water supply pipeline and second warm pump water supply pipeline, the warm pump water can directly flow into the pre-pump through the first warm pump water supply pipeline, It flows into the pressure stage pump, avoiding the situation of being shunted by the recirculation pipeline, so that a sufficient flow of warm pump water flows into the front pump and the pressure stage pump, ensuring that both the front pump and the pressure stage pump can achieve a good warm pump effect , and then the spare electric pump set can be put into use smoothly.

In one of the embodiments, the first output port is used to connect with the sewage outlet of the pre-pump. That is, the injection point of the warm pump water is set at the bottom of the front pump, and the warm pump water will flow through the front pump from bottom to top. This warm pump path can make the front pump more evenly heated.

In one of the embodiments, the second output end is used to connect with the sewage outlet of the pressure stage pump. That is, the injection point of the warm pump water is set at the bottom of the pressure stage pump, and the warm pump water will flow through the pressure stage pump from bottom to top. This warm pump path can make the pressure stage pump more evenly heated.

In one of the embodiments, the first heating pump water supply pipeline is provided with a first isolation valve and a first orifice plate connected in series, and the first orifice plate is located between the first isolation valve and the front pump. between. The first isolation valve is equivalent to a switch of the water supply pipeline of the first heating pump, and plays a role of isolating fluid. The first orifice can reduce the pressure of the warm pump water and prevent cavitation.

In one of the embodiments, the second input end is located between the first input end and the first isolation valve, and the second heating pump water supply pipeline is provided with a second isolation valve and a second isolation valve connected in series. Two orifice plates, the second orifice plate is located between the second isolation valve and the pressure stage pump. The second isolation valve is equivalent to the switch of the water supply pipeline of the second heating pump, and plays the role of isolating fluid. The second orifice plate can reduce the pressure of the warm pump water and prevent cavitation.

In one of the embodiments, a first flow regulating valve is further provided on the water supply pipeline of the second heating pump, and the first flow regulating valve is located between the second orifice plate and the pressure stage pump. Staff can manually adjust the flow of warm pump water into the pressure stage pump.

In one of the embodiments, the second input end is located between the first orifice plate and the first output end. The first warm pump water supply pipeline and the second warm pump water supply pipeline share the first isolation valve and the first orifice plate, thereby reducing production costs.

In one of the embodiments, a second flow regulating valve is further provided on the water supply pipeline of the first heating pump, and the second flow regulating valve is located between the first orifice plate and the pre-pump. Staff can manually adjust the flow of warm pump water flowing into the front pump.

A main feedwater pump system comprising:

deaerator;

A standby electric pump set, including the front pump and the pressure stage pump connected in series, and the deaerator is connected to the radial outlet of the front pump;

A main pipe, one end of which is connected to the radial outlet of the pressure stage pump, and a check valve is arranged on the main pipe;

a steam generator connected to the other end of the main pipe;

The recirculation pipeline includes a first end and a second end oppositely arranged, the first end is connected to the deaerator, the second end is connected to the main pipe, and the second end is located at between the one-way valve and the pressure stage pump; and

In any one of the above heat pump systems, the one-way valve is located between the second end and the connection between the heat pump system and the main pipe.

The heating pump system can make the pre-pump and pressure-stage pump evenly heated, and prevent thermal shock to the pre-pump and pressure-stage pump due to excessive temperature difference, so that the spare electric pump set can be put into use smoothly.

In one of the embodiments, a stop valve is provided on the recirculation pipeline. In addition to controlling the flow of water flowing through the recirculation line, the shut-off valve can also open and close the recirculation line.

Description of drawings

FIG. 1 is a block diagram of a heating pump system applied in a main feed water pump system according to an embodiment;

Fig. 2 is the modular block diagram of the standby electric pump group in the main feed water pump system shown in Fig. 1;

Fig. 3 is a structural flow chart of the main feed water pump system shown in Fig. 1 .

Detailed ways

The heating pump system and the main feedwater pump system will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1 and Figure 3, the main feed water pump system 10 of an embodiment includes a deaerator 100, an electric pump group 200, a main pipe 300, a steam generator 400 and a recirculation pipeline 500, wherein the deaerator 100, the electric The pump set 200, the main pipe 300 and the steam generator 400 are sequentially connected in series. The deaerator 100 is used to remove oxygen and other gases dissolved in water, so as to prevent the heated water from corroding pipelines and other auxiliary equipment. The electric pump unit 200 can transfer the water in the deaerator 100 to the main pipe 300 and then to the steam generator 400 . The main pipe 300 is provided with a one-way valve 310 to limit the direction of water flow in the main pipe 300 .

The recirculation pipeline 500 includes a first end and a second end oppositely arranged, the first end is connected to the deaerator 100, the second end is connected to the main pipe 300, and the second end is located between the one-way valve 310 and the electric pump unit 200 between. The main function of the recirculation pipeline 500 is to prevent the phenomenon of vaporization due to rising water temperature when the feed water pump of the electric pump unit 200 is just started or operates at a very low load, so as to ensure the safe operation of the feed water pump. The recirculation pipeline 500 is provided with a shut-off valve 510 , the shut-off valve 510 not only can control the flow of water flowing through the recirculation pipeline 500 , but also can open and close the recirculation pipeline 500 .

There are three electric pump sets 300, including the first electric pump set 200a, the second electric pump set 200b and the backup electric pump set 200c, and the three electric pump sets 300 are arranged in parallel. The structure of each electric pump set 300 is the same. Taking the standby electric pump set 200c as an example, as shown in FIG. One end of the motor 220 directly drives the front pump 210 , and the other end drives the pressure stage pump 240 through the hydraulic coupling 230 and the gear box. Both the front pump 210 and the pressure stage pump 240 are horizontal pumps, which generally include an axial inlet, a radial outlet on the upper part of the pump casing, and a radial sewage outlet on the lower part of the pump casing. The deaerator 100 is connected to the radial outlet of the front pump 210 , and the main pipe 300 is connected to the radial outlet of the pressure stage pump 240 .

Normally, the first electric pump set 200a and the second electric pump set 200b operate normally, and if any one of the two sets fails, the standby electric pump set 200c will be put into use. Since the water temperature in the deaerator 100 is as high as 149°C, if the standby electric pump unit 200c is directly used, the high temperature water in the deaerator 100 will cause a large temperature difference between the upper and lower parts of the pump casings of the front pump 210 and the pressure stage pump 240 , and cause thermal shock to the front pump 210 and the pressure stage pump 240 , directly damage the front pump 210 and the pressure stage pump 240 .

In order to avoid damage to the pre-pump 210 and the pressure-stage pump 240, this embodiment provides a warm pump system 600. The warm-pump system 600 can provide the pre-pump 210 and the pressure-stage pump 240 with Heat pump water.

Specifically, please refer to FIG. 3 , the heat pump system 600 includes a first heat pump water supply pipeline 610 and a second heat pump water supply pipeline 620 , and the first heat pump water supply pipeline 610 includes a first input end 612 and a first output end oppositely arranged. 614 , the first input end 612 is connected to the main pipe 300 , the first output end 614 is used to connect to the front pump 210 , and the first heating pump water supply line 610 is used to be separated from the recirculation line 500 .

The second heating pump water supply pipeline 620 includes a second input end 622 and a second output end 624 oppositely arranged, the second input end 622 is connected to the main pipe 300, the second output end 624 is used to connect with the pressure stage pump 240, and the second The warm pump water supply line 620 is used to be spaced from the recirculation line 500 .

In this embodiment, the warm pump water comes from the first electric pump set 200a or the second electric pump set 200b in normal use, and the warm pump water flows into the first warm pump water supply pipeline 610 and the second warm pump water supply pipeline through the main pipe 300 respectively. 620, then directly flows into the front pump 210 through the first warm pump water supply pipeline 610, and directly flows into the pressure stage pump 240 through the second warm pump water supply pipeline 620, avoiding the situation of being diverted by the recirculation pipeline 500, thus having enough The flow of warm pump water flows into the pre-pump 210 and the pressure-stage pump 240 to ensure that the pre-pump 210 and the pressure-stage pump 240 can be evenly heated. When the temperature difference between the upper and lower parts of the pump casings of the front pump 210 and the pressure stage pump 240 is less than 25°C, the spare electric pump set 200c can be put into use smoothly.

In addition, in the traditional heat pump system, the heat pump water pipeline is generally connected with a jumper pipe so that the heat pump water can flow into both the front pump and the pressure stage pump, but the diameter of the jumper pipe is relatively large. After the warm pump water enters the jumper pipe, the flow rate of the warm pump water flowing into the front pump and the pressure stage pump cannot be accurately controlled, so that the warm pump effect of the front pump and the pressure stage pump cannot be guaranteed.

For this situation, in this embodiment, the first output end 612 is used to connect with the sewage outlet of the front pump 210 . That is, the injection point of the warm pump water is set at the bottom of the front pump 210, and the warm pump water will flow through the front pump 210 from bottom to top. The flow rate can make the front pump 210 be heated more evenly.

Likewise, the second output port 624 is used to connect to the drain port of the pressure stage pump 240 . That is, the injection point of the warm pump water is set at the bottom of the pressure stage pump 240, and the warm pump water will flow through the pressure stage pump 240 from bottom to top. The flow rate can make the pressure stage pump 240 be heated more evenly.

As shown in FIG. 3 , the first heating pump water supply line 610 is provided with a first isolation valve 630 and a first orifice plate 640 connected in series, and the first orifice plate 640 is located between the first isolation valve 630 and the front pump 210 . The first isolation valve 630 is equivalent to the switch of the first heating pump water supply pipeline 610 and plays a role of isolating fluid. When the heat pump system 600 is in use, the first isolation valve 630 is in an open state to allow the heat pump water to flow through. After the heating pump is finished, the first isolation valve 630 needs to be closed, and the standby electric pump set 200c is put into use.

The first orifice plate 640 is a throttling orifice plate. When the warm pump water flows in the first warm pump water supply pipeline 610 , the first orifice plate 640 can reduce the pressure of the warm pump water and prevent cavitation.

On the second warm pump water supply line 620 , the second input 622 is located between the first input 612 and the first isolation valve 630 . The second heating pump water supply line 620 is provided with a second isolation valve 650 and a second orifice plate 660 connected in series, and the second orifice plate 660 is located between the second isolation valve 650 and the pressure stage pump 240 . The second isolation valve 650 is equivalent to the switch of the second heating pump water supply pipeline 620 and plays a role of isolating fluid. When the heat pump system 600 is in use, the second isolation valve 650 is in an open state to allow the heat pump water to flow through. After the heating pump is finished, the second isolation valve 650 needs to be closed, and the standby electric pump set 200c is put into use.

The second orifice plate 660 is a throttling orifice plate. When the warm pump water flows in the second warm pump water supply pipeline 620 , the second orifice plate 660 can reduce the pressure of the warm pump water to prevent cavitation.

For the heat pump system 600 in this embodiment, the connection between the second input end 622 and the first heat pump water supply pipeline 610 is equivalent to the diversion point of the heat pump water. The first heating pump water supply pipeline 610 flows into the front pump 210 , and another part flows into the second heating pump water supply pipeline 620 through the second input port 622 , and then flows into the pressure stage pump 240 .

In other embodiments, the second input end 622 can also be arranged between the first orifice plate 640 and the first output end 614, so that the first warm pump water supply pipeline 610 and the second warm pump water supply pipeline 620 share the first isolation valve 630 and the first orifice plate 640, the second isolation valve 650 and the second orifice plate 660 can be omitted.

Alternatively, the second input port 622 can also be arranged between the first isolation valve 630 and the first orifice plate 640, so that the first heating pump water supply line 610 and the second heating pump water supply line 620 share the first isolation valve 630, and the second Isolation valve 650 may be omitted.

Alternatively, the second input end 622 is directly disposed on the main pipe 300 and is located between the first input end 612 and the stop valve 510 .

In this embodiment, the second heating pump water supply line 620 is further provided with a first flow regulating valve 626 , and the first flow regulating valve 626 is located between the second orifice 660 and the pressure stage pump 240 . A worker can manually adjust the flow of warm pump water flowing into the pressure stage pump 240 .

The first heating pump water supply line 610 is further provided with a second flow regulating valve 616 , and the second flow regulating valve 616 is located between the first orifice 640 and the front pump 210 . Staff can manually adjust the flow of warm pump water flowing into the front pump 210 .

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. 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 belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. a kind of female footballer provides warming-up water for the fore pump into main feed pump system and pressure stage pump, the master gives Main pipe, the oxygen-eliminating device being connected with the fore pump and the both ends that water pump system further includes one end and pressure stage pump connection are distinguished The recirculation line being connected with the main pipe and the oxygen-eliminating device, which is characterized in that the female footballer includes：

First warming-up water supply line, including the first input end and the first output terminal being oppositely arranged, the first input end and institute State main pipe connection, first output terminal for be connected with the fore pump, the first warming-up water supply line for it is described Recirculation line interval；And

Second warming-up water supply line, including the second input terminal being oppositely arranged and second output terminal, second input terminal and institute Main pipe connection is stated, the second output terminal is used to pump with the pressure stage and connect, and the second warming-up water supply line is used for and institute State recirculation line interval.

2. female footballer according to claim 1, which is characterized in that first output terminal is used for and the fore pump Sewage draining exit connects.

3. female footballer according to claim 1, which is characterized in that the second output terminal is used to pump with the pressure stage Sewage draining exit connection.

4. female footballer according to claim 1, which is characterized in that the first warming-up water supply line is equipped with concatenation First isolating valve and the first orifice plate, first orifice plate is between first isolating valve and the fore pump.

5. female footballer according to claim 4, which is characterized in that second input terminal is located at the first input end Between first isolating valve, the second warming-up water supply line is equipped with the second isolating valve and the second orifice plate of concatenation, institute The second orifice plate is stated to be located between second isolating valve and pressure stage pump.

6. female footballer according to claim 5, which is characterized in that be additionally provided with first on the second warming-up water supply line Flow control valve, the first flow regulating valve are located between second orifice plate and pressure stage pump.

7. female footballer according to claim 4, which is characterized in that second input terminal be located at first orifice plate with Between first output terminal.

8. female footballer according to claim 4, which is characterized in that be additionally provided with second on the first warming-up water supply line Flow control valve, the second flow regulating valve is between first orifice plate and the fore pump.

9. a kind of main feed pump system, which is characterized in that including：

Oxygen-eliminating device；

Spare electronic pump group, the fore pump and pressure stage pump including concatenation, the oxygen-eliminating device and the fore pump Radially outlet connects；

Main pipe, one end are connected with the radially outlet that the pressure stage pumps, and the main pipe is equipped with check valve；

Steam generator is connected with the other end of the main pipe；

The recirculation line, including the first end and second end being oppositely arranged, the first end is connected with the oxygen-eliminating device, institute It states second end to be connected with the main pipe, and the second end is located between the check valve and pressure stage pump；And

Such as claim 1-8 any one of them female footballers, the check valve is located at the second end and the female footballer Between the junction of the main pipe.

10. main feed pump system according to claim 9, which is characterized in that the recirculation line is equipped with shut-off valve.