CN219494060U - Low-pressure heater drainage recovery unit and low-pressure heater system - Google Patents

Abstract

The utility model relates to a drain recovery unit of a low-pressure heater and a low-pressure heater system. The low pressure heater drain recovery unit includes: the common low-pressure drain tank is used for communicating with the first drain pipeline of the first low-pressure heater group and the second drain pipeline of the second low-pressure heater group; and the drainage pump assembly comprises a drainage pump, a water inlet pipeline and a water outlet pipeline, wherein an inlet of the drainage pump is communicated with the common low-pressure drainage box through the water inlet pipeline, an outlet of the drainage pump is connected with the water outlet pipeline, drainage in the common low-pressure drainage box enters the drainage pump through the water inlet pipeline, and the drainage pump is used for pumping drainage to the water outlet pipeline for discharging. In this way, the first low-pressure heater group and the second low-pressure heater group are collected simultaneously by using the common low-pressure drain tank 31, which is advantageous in reducing system equipment configuration, simplifying system design, and optimizing equipment and piping arrangement space, compared with the scheme of configuring two low-pressure drain tanks in the prior art.

Description

Low-pressure heater drainage recovery unit and low-pressure heater system

Technical Field

The utility model relates to the technical field of nuclear power, in particular to a low-pressure heater drainage recovery unit and a low-pressure heater system.

Background

In a nuclear power unit, the conventional island low pressure heater system is typically a dual column low pressure heater. In order to recycle the drain water discharged by the double-row low-pressure heaters, each row of low-pressure heaters is required to be provided with a set of drain boxes, each drain box is required to be provided with two drain pumps with 100% capacity (one drain pump is standby, namely one drain pump is used for one drain pump), so that the redundancy of equipment is large, pipelines and accessories are complex, and the space requirements for equipment and pipeline arrangement are high.

Disclosure of Invention

Based on the above, it is necessary to provide a low-pressure heater drain recovery unit and a low-pressure heater system for solving the problems of the prior art that the low-pressure heater drain recovery unit has a large redundancy of equipment, complex pipelines and accessories, and high space requirements for equipment and pipeline arrangement.

A low pressure heater drain recovery unit for recovering drain water discharged from a first low pressure heater group and a second low pressure heater group, the low pressure heater drain recovery unit comprising:

a common low pressure drain tank for communicating with a first drain line of the first low pressure heater group and a second drain line of the second low pressure heater group; a kind of electronic device with high-pressure air-conditioning system

The drainage pump assembly comprises a drainage pump, a water inlet pipeline and a water outlet pipeline, wherein an inlet of the drainage pump is communicated with the common low-pressure drainage box through the water inlet pipeline, an outlet of the drainage pump is connected with the water outlet pipeline, drainage in the low-pressure drainage box enters the drainage pump through the water inlet pipeline, and the drainage pump is used for pumping the drainage pump to the water outlet pipeline for discharging.

In one embodiment, the low pressure heater drain recovery unit further comprises a recirculation line connected between the water outlet line and the common low pressure drain tank.

In one embodiment, a recirculation valve is installed on the recirculation line, and the recirculation valve is used for controlling the connection or disconnection of the recirculation line.

In one embodiment, the number of the drain pump assemblies is three, the drain recovery unit of the low-pressure heater further comprises a drain pipeline, the water outlet pipelines of the three drain pump assemblies are all connected with the drain pipeline, and the recirculation pipeline is connected between the drain pipeline and the common low-pressure drain tank.

In one embodiment, the water inlet pipeline is provided with a first isolation valve and a first filter screen, the first isolation valve is used for controlling the on/off of the water inlet pipeline, and the first filter screen is used for filtering the water which flows through the water inlet pipeline.

In one embodiment, the water outlet pipeline is provided with a second isolation valve and a check valve, the second isolation valve is used for controlling the connection or disconnection of the water outlet pipeline, and the check valve is used for preventing the drain water in the water outlet pipeline from flowing back to the drain pump.

In one embodiment, the drain recovery unit of the low pressure heater further comprises a first emergency drain pipeline and a first emergency drain valve, wherein the first emergency drain pipeline is connected to the common low pressure drain tank, and the first emergency drain valve is installed on the first emergency drain pipeline and used for controlling the on or off of the first emergency drain pipeline.

A low pressure heater system comprising a first low pressure heater group, a second low pressure heater group and a low pressure heater drain recovery unit as described in any of the embodiments above.

In one embodiment, the first low-pressure heater group comprises a first low-pressure heater and a second low-pressure heater, the first low-pressure heater is communicated with the second low-pressure heater through a first connecting pipeline, the first connecting pipeline is used for conveying the drain water discharged by the first low-pressure heater to the second low-pressure heater, and the second low-pressure heater is communicated with the common low-pressure drain tank through the first drain water discharging pipeline;

the second low-pressure heater group comprises a third low-pressure heater and a fourth low-pressure heater, the third low-pressure heater is communicated with the fourth low-pressure heater through a second connecting pipeline, the second connecting pipeline is used for conveying drain water discharged by the third low-pressure heater to the fourth low-pressure heater, and the fourth low-pressure heater is communicated with the common low-pressure drain tank through a second drain discharge pipeline.

In one embodiment, the first low pressure heater group further comprises a second emergency drain line and a second emergency drain valve; the second emergency drainage pipeline is connected to the first low-pressure heater, and the second emergency drainage valve is arranged on the second emergency drainage pipeline and used for controlling the on or off of the second emergency drainage pipeline;

the second low-pressure heater group also comprises a third emergency drainage pipeline and a third emergency drainage valve; the third emergency drainage pipeline is connected to the third low-pressure heater, and the third emergency drainage valve is installed on the third emergency drainage pipeline and used for controlling the on/off of the third emergency drainage pipeline.

According to the low-pressure heater drainage recovery unit and the low-pressure heater system, in actual use, drainage discharged by the first low-pressure heater group enters the common low-pressure drainage box through the first drainage discharge pipeline, and drainage discharged by the second low-pressure heater group also enters the common low-pressure drainage box through the second drainage discharge pipeline. The drain water entering the common low-pressure drain tank enters the drain pump through the water inlet pipeline, is pressurized under the pumping action of the drain pump, and is discharged from the water outlet pipeline, so that the drain water discharged by the first low-pressure heater group and the second low-pressure heater group is recovered.

Therefore, the first low-pressure heater group and the second low-pressure heater group are collected simultaneously by utilizing the common low-pressure drain tank, and compared with the scheme of configuring two low-pressure drain tanks in the prior art, the system equipment configuration is reduced, the system design is simplified, and the equipment and pipeline arrangement space is optimized.

Drawings

FIG. 1 is a schematic diagram of a low pressure heater hydrophobic recovery unit according to an embodiment of the utility model.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, an embodiment of the present utility model provides a low pressure heater system, which includes a first low pressure heater group 10, a second low pressure heater group 20, and a low pressure heater drain recovery unit 30. The low pressure heater drain recovery unit 30 is used to collect drain water discharged from the first low pressure heater group 10 and the second low pressure heater group 20 during normal, transient and critical conditions.

The low pressure heater drain recovery unit 30 includes a common low pressure drain tank 31 and drain pump assembly 32. The common low-pressure drain tank 31 is configured to communicate with the first drain line 14 of the first low-pressure heater group 10 and the second drain line 24 of the second low-pressure heater group 20, so that drain water discharged from the first low-pressure heater group 10 through the first drain line 14 can enter the common low-pressure drain tank 31, and drain water discharged from the second low-pressure heater group 20 through the second drain line 24 can also enter the common low-pressure drain tank 31. The drain pump assembly 32 includes a drain pump 321, an inlet conduit 322, and an outlet conduit 325. The inlet of the drain pump 321 communicates with the common low pressure drain tank 31 through a water inlet line 322. The outlet of the drain pump 321 is connected with an outlet pipeline 325, drain water in the common low-pressure drain tank 31 enters the drain pump 321 through a water inlet pipeline 322, and the drain pump 321 is used for pumping the drain water to the outlet pipeline 325 for discharge, so that the drain water discharged by the first low-pressure heater group 10 and the second low-pressure heater group 20 is recovered.

In the low-pressure heater drain recovery unit 30, in actual use, the drain water discharged from the first low-pressure heater group 10 enters the common low-pressure drain tank 31 through the first drain discharge pipe 14, and the drain water discharged from the second low-pressure heater group 20 also enters the common low-pressure drain tank 31 through the second drain discharge pipe 24. The drain pump 321 which enters the common low-pressure drain tank 31 and enters the drain tank through the water inlet pipeline 322 is pressurized under the pumping action of the drain pump 321 and is discharged from the water outlet pipeline 325, so that the drain water discharged by the first low-pressure heater group 10 and the second low-pressure heater group 20 is recovered.

In this way, the first low-pressure heater group 10 and the second low-pressure heater group 20 are collected simultaneously by using the common low-pressure drain tank 31, which is advantageous in reducing system equipment configuration, simplifying system design, optimizing equipment and piping arrangement space, and thus saving project investment and engineering cost, compared with the scheme of configuring two low-pressure drain tanks in the prior art.

In particular to the embodiment, the low pressure heater hydrophobic recovery unit 30 further comprises a recirculation line 33. The recirculation line 33 is connected between the water outlet line 325 and the common low pressure drain tank 31. Thus, when the water level in the common low-pressure drain tank 31 is too low, the drain water discharged from the common low-pressure drain tank 31 under the pumping action of the drain pump 321 enters the common low-pressure drain tank 31 again through the recirculation pipeline 33, so that the drain pump 321 is prevented from idling and being damaged, and the safe operation of the drain pump 321 is ensured.

Further, a recirculation valve 34 is installed on the recirculation line 33, and the recirculation valve 34 is used to control the on or off of the recirculation line 33. In this way, when the drain water level in the common low pressure drain tank 31 is normal, the recirculation valve 34 controls the recirculation line 33 to be shut off, so that the drain water in the common low pressure drain tank 31 is discharged through the water outlet line 325 under the pumping action of the drain pump 321 to be recovered. When the water level in the common low-pressure drain tank 31 is low, the recirculation valve 34 controls the recirculation pipeline 33 to be conducted, and the drain water discharged from the common low-pressure drain tank 31 under the pumping action of the drain pump 321 enters the common low-pressure drain tank 31 again through the recirculation pipeline 33, so that the drain pump 321 is prevented from idling and being damaged, and the safe operation of the drain pump 321 is ensured. Alternatively, recirculation valve 34 may be a pneumatic valve.

Further, the number of drain pump assemblies 32 is set to three, and the low pressure heater drain recovery unit 30 further includes a drain line 35. The water outlet lines 325 of the three drain pump assemblies 32 are each connected to a drain line 35, and the recirculation line 33 is connected between the drain line 35 and the common low pressure drain tank 31. Thus, any two of the three hydrophobic pumps 321 perform pumping operations, with the remaining one serving as a back-up (i.e., dual-purpose back-up). When one of the two drain pumps 321 performing the pumping operation is damaged, the standby drain pump 321 is activated to perform the pumping operation, thereby ensuring the stable operation of the low-pressure heater drain recovery unit 30.

It will be appreciated that two recirculation lines 33 are required as two low pressure hydrophobic tanks are required in the prior art. In contrast, in the present application, only one recirculation line 33 is required because one common low-pressure drain is shared, and three drain pumps 321 are provided for both purposes, thereby contributing to a reduction in system configuration, simplification of system design, and optimization of equipment and piping layout space.

In particular, in the embodiment, a first isolation valve 323 and a first filter screen 324 are installed on each water inlet pipe 322. The first isolation valve 323 is used for controlling the on/off of the water inlet pipeline 322, and the first filter screen 324 is used for filtering the drain water flowing through the water inlet pipeline 322. Thus, when the drain is not recovered, the first isolation valve 323 controls the water inlet line 322 to be shut off. In the process of recycling the drain water, the first isolation valve 323 controls the water inlet pipeline 322 to be conducted, so that the drain water in the common low-pressure drain tank 31 can enter the drain pump 321 through the water inlet pipeline 322. And, all filter through first filter screen 324 before the hydrophobic pump 321 that gets into, avoid impurity to get into hydrophobic pump 321 and damage hydrophobic pump 321. Alternatively, the first isolation valve 323 may employ an electrically operated isolation valve.

In particular to the embodiment, a second isolation valve 326 and a check valve 327 are mounted on each of the water outlet lines 325. The second isolation valve 326 is used for controlling the on or off of the water outlet pipeline 325, and the check valve 327 is used for preventing the drain water in the water outlet pipeline 325 from flowing back to the drain pump 321. Alternatively, the second isolation valve 326 may be an electrically operated isolation valve.

In particular to the embodiment, the low pressure heater drain recovery unit 30 further includes a first emergency drain line 36 and a first emergency drain valve 37. The first emergency drain line 36 is connected to the common low pressure drain tank 31, and the first emergency drain valve 37 is installed on the first emergency drain line 36 for controlling on or off of the first emergency drain line 36. In this way, when a high water level occurs in the common low-pressure drain tank 31, the first emergency drain valve 37 controls the first emergency drain pipeline 36 to be turned on, so that drain water in the common low-pressure drain tank 31 can be directly drained from the first emergency drain pipeline 36, and the water level in the common low-pressure drain tank 31 is timely reduced. When the water level in the common low-pressure drain tank 31 is normal, the first emergency drain valve 37 controls the first emergency drain line 36 to be shut off so that drain water in the common low-pressure drain tank 31 cannot be drained from the first emergency drain line 36.

In particular to the embodiment, the first low-pressure heater group 10 includes a first low-pressure heater 11 and a second low-pressure heater 12. The first low-pressure heater 11 and the second low-pressure heater 12 are communicated through a first connecting pipe 13. The first connection pipe 13 is used to convey the drain water discharged from the first low pressure heater 11 to the second low pressure heater 12. The second low-pressure heater 12 is communicated with the common low-pressure drain tank 31 through a first drain discharge pipe 14, and the first drain discharge pipe 14 is used for conveying drain water discharged by the second low-pressure heater 12 to the common low-pressure drain tank 31. As such, the drain in the first low pressure heater 11 is delivered to the second low pressure heater 12 through the first connection pipe 13, and the drain in the second low pressure heater 12 is delivered to the common low pressure drain tank 31 through the first drain discharge pipe 14.

Further, the first low pressure heater group 10 further includes a second emergency drain line 15 and a second emergency drain valve 16. The second emergency drain line 15 is connected to the first low-pressure heater 11. A second emergency drain valve 16 is installed on the second emergency drain line 15 for controlling on or off of the second emergency drain line 15. In this manner, when the water level in the first low pressure heater 11 is normal, the second emergency drain valve 16 controls the second emergency drain line 15 to be cut off, thereby preventing drain water in the first low pressure heater 11 from being drained from the second emergency drain line 15. When a high water level occurs in the first low-pressure heater 11, the second emergency drain valve 16 controls the second emergency drain pipeline 15 to be conducted, so that drain water in the first low-pressure heater 11 can be directly drained from the second emergency drain pipeline 15, and the water level in the first low-pressure heater 11 is timely reduced.

In particular to the embodiment, the second low-pressure heater group 20 includes a third low-pressure heater 21 and a fourth low-pressure heater 22. The third low-pressure heater 21 and the fourth low-pressure heater 22 are communicated through a second connecting pipeline 23. The second connecting line 23 is used to convey the drain water discharged from the third low pressure heater 21 to the fourth low pressure heater 22. The fourth low-pressure heater 22 is in communication with the common low-pressure drain tank 31 via the second drain line 24. The drain line 24 is used to convey drain from the fourth low pressure heater 22 to a common low pressure drain tank 31. In this way, the drain water in the third low-pressure heater 21 is sent to the fourth low-pressure heater 22 through the second connection pipe 23, and the drain water in the fourth low-pressure heater 22 is sent to the common low-pressure drain tank 31 through the second drain pipe 24.

Further, the second low pressure heater group 20 further includes a third emergency drain line 25 and a third emergency drain valve 26. The third emergency drain line 25 is connected to the third low-pressure heater 21. A third emergency drain valve 26 is installed on the third emergency drain line 25 for controlling on or off of the third emergency drain line 25. In this way, when the water level in the third low pressure heater 21 is normal, the third emergency drain valve 26 controls the third emergency drain line 25 to be cut off, thereby preventing drain water in the third low pressure heater 21 from being drained from the third emergency drain line 25. When a high water level occurs in the third low-pressure heater 21, the third emergency drain valve 26 controls the third emergency drain pipeline 25 to be conducted, so that drain water in the third low-pressure heater 21 can be directly drained from the third emergency drain pipeline 25, and the water level in the third low-pressure heater 21 is timely reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A low pressure heater drain recovery unit for recovering drain water discharged from a first low pressure heater group (10) and a second low pressure heater group (20), characterized in that the low pressure heater drain recovery unit (30) comprises:

a common low pressure drain tank (31) for communicating with the first drain line (14) of the first low pressure heater group (10) and the second drain line (24) of the second low pressure heater group (20); a kind of electronic device with high-pressure air-conditioning system

The drainage pump assembly (32) comprises a drainage pump (321), a water inlet pipeline (322) and a water outlet pipeline (325), wherein an inlet of the drainage pump (321) is communicated with the common low-pressure drainage box (31) through the water inlet pipeline (322), an outlet of the drainage pump (321) is connected with the water outlet pipeline (325), drainage in the common low-pressure drainage box (31) enters the drainage pump (321) through the water inlet pipeline (322), and the drainage pump (321) is used for pumping drainage to the water outlet pipeline (325) for discharging.

2. The low pressure heater drain recovery unit according to claim 1, wherein the low pressure heater drain recovery unit (30) further comprises a recirculation line (33), the recirculation line (33) being connected between the water outlet line (325) and the common low pressure drain tank (31).

3. A low pressure heater drain recovery unit according to claim 2, characterized in that a recirculation valve (34) is mounted on the recirculation line (33), the recirculation valve (34) being used to control the switching on or off of the recirculation line (33).

4. The low pressure heater drain recovery unit according to claim 2, wherein the number of drain pump assemblies (32) is set to three, the low pressure heater drain recovery unit (30) further comprises a drain line (35), the outlet lines (325) of the three drain pump assemblies (32) are each connected to the drain line (35), and the recirculation line (33) is connected between the drain line (35) and the common low pressure drain tank (31).

5. The low-pressure heater drainage recovery unit according to claim 1, wherein a first isolation valve (323) and a first filter screen (324) are installed on the water inlet pipeline (322), the first isolation valve (323) is used for controlling the connection or disconnection of the water inlet pipeline (322), and the first filter screen (324) is used for filtering drainage flowing through the water inlet pipeline (322).

6. The low-pressure heater drainage recovery unit according to claim 1, wherein a second isolation valve (326) and a check valve (327) are installed on the water outlet pipeline (325), the second isolation valve (326) is used for controlling the connection or disconnection of the water outlet pipeline (325), and the check valve (327) is used for preventing drainage in the water outlet pipeline (325) from flowing back to the drainage pump (321).

7. The low-pressure heater drain recovery unit according to claim 1, wherein the low-pressure heater drain recovery unit (30) further comprises a first emergency drain line (36) and a first emergency drain valve (37), the first emergency drain line (36) being connected to the common low-pressure drain tank (31), the first emergency drain valve (37) being mounted on the first emergency drain line (36) for controlling the turning on or off of the first emergency drain line (36).

8. A low pressure heater system, characterized by comprising a first low pressure heater group (10), a second low pressure heater group (20) and a low pressure heater drain recovery unit (30) according to any of claims 1 to 7.

9. The low-pressure heater system according to claim 8, characterized in that the first low-pressure heater group (10) comprises a first low-pressure heater (11) and a second low-pressure heater (12), the first low-pressure heater (11) and the second low-pressure heater (12) being in communication through a first connection line (13), the first connection line (13) being used for conveying the drain water discharged by the first low-pressure heater (11) to the second low-pressure heater (12), the second low-pressure heater (12) being in communication with the common low-pressure drain tank (31) through the first drain water discharge line (14);

the second low-pressure heater group (20) comprises a third low-pressure heater (21) and a fourth low-pressure heater (22), the third low-pressure heater (21) is communicated with the fourth low-pressure heater (22) through a second connecting pipeline (23), the second connecting pipeline (23) is used for conveying drain water discharged by the third low-pressure heater (21) to the fourth low-pressure heater (22), and the fourth low-pressure heater (22) is communicated with the common low-pressure drain tank (31) through a second drain discharge pipeline (24).

10. The low-pressure heater system according to claim 9, wherein the first low-pressure heater group (10) further comprises a second emergency drain line (15) and a second emergency drain valve (16); the second emergency drainage pipeline (15) is connected to the first low-pressure heater (11), and the second emergency drainage valve (16) is arranged on the second emergency drainage pipeline (15) and used for controlling the on or off of the second emergency drainage pipeline (15);

the second low-pressure heater group (20) further comprises a third emergency drain pipeline (25) and a third emergency drain valve (26); the third emergency drainage pipeline (25) is connected to the third low-pressure heater (21), and the third emergency drainage valve (26) is installed on the third emergency drainage pipeline (25) and used for controlling the on or off of the third emergency drainage pipeline (25).