CN218599828U

CN218599828U - Water feeding pump set heating pump system with front-mounted pump

Info

Publication number: CN218599828U
Application number: CN202222816952.3U
Authority: CN
Inventors: 张春辉; 彭锐; 廖广临; 易凡; 雷宇霆; 韩汉平; 余永江; 唐美琼; 李姗姗
Original assignee: China City Environment Protection Engineering Ltd
Current assignee: China City Environment Protection Engineering Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-03-10
Anticipated expiration: 2032-10-25

Abstract

The utility model relates to the technical field of water feeding pump equipment, in particular to a water feeding pump group heating pump system with a front pump; the heating pump system comprises at least two parallel water supply pipelines arranged between a deaerator and a boiler, a front-mounted pump and a water supply pump are sequentially connected in series on the water supply pipelines, the outlet end of the front-mounted pump is connected with the inlet end of the water supply pump through a pipeline, and the outlet end of the water supply pump is also connected with the deaerator; the heating pump pipeline is communicated with the pipeline at the outlet end of each front pump. The two paths of medium-pressure water flowing out of the preposed pump in the running state of the system respectively flow into the preposed pump in the warming state and the water feeding pump to be warmed, the preposed pump adopts a back-warming mode warm pump, the water feeding pump adopts a forward-warming mode warm pump, the potential safety hazard of high-pressure water supply back-filling caused by series connection of different water supply pressure grades can be effectively avoided, water behind the warm pump flows into a deaerator uniformly, the warm pump water can be effectively recycled, and the safety and the economical efficiency of a power plant are improved.

Description

Water feeding pump set heating pump system with front-mounted pump

Technical Field

The utility model relates to a water-feeding pump equipment technical field especially relates to a take water-feeding pump group warm pumping system of leading pump.

Background

The temperature of the conveying medium of the boiler water feeding pump is high, after the water feeding pump stops operating, the residual water in the water feeding pump can be gradually cooled and sinks to the bottom of the water feeding pump, the hot water rises to the upper portion of the water feeding pump, so that the temperature difference exists between the upper portion and the lower portion of the water feeding pump, the upper portion and the lower portion of the water feeding pump generate different degrees of thermal expansion, and the upper shell and the lower shell of the water feeding pump generate deformation due to the temperature difference. Before the pump is not warmed, the water feeding pump is started, so that the dynamic balance precision of a rotor is seriously damaged, the vibration of the pump is inevitably caused, the service life of a shaft seal is shortened, and the warming of the pump is carried out before the operation, which is an important condition for ensuring the stable operation of the pump.

The water supply pump heating system is divided into a reverse heating mode and a forward heating mode, the reverse heating system generally leads medium-pressure water supply or a middle tap of a water supply pump to a high-pressure water supply pipeline at the outlet of another pump, the forward heating system leads the medium-pressure water supply to a high-pressure water supply pipeline at the inlet of another pump, the existing heating system comprises a front pump and a water supply pump which are connected in series, the heating modes of the front pump and the water supply pump are the same, in the reverse heating mode, if a system valve is not closed tightly or leaks internally, pumps with different water supply pressure grades are connected in series, and the potential safety hazard that the high-pressure water supply leaks to the low-pressure side exists; in addition, the water of the warming pump behind part of the warming pumps of the positive warming system is directly discharged into the trench, so that the great waste of water resources is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a water-feeding pump group heating system with a preposed pump, which comprises at least two parallel water supply pipelines arranged between a deaerator and a boiler, wherein the water supply pipelines are provided with the preposed pump and a water-feeding pump, the inlet end of the preposed pump is connected with the deaerator, the outlet end of the preposed pump is connected with the inlet end of the water-feeding pump through a pipeline, the outlet end of the water-feeding pump is connected with the boiler, and the outlet end of the water-feeding pump is also connected with the deaerator; the heating pump system further comprises heating pump pipelines which are communicated with pipelines at the outlet ends of the front pumps, and medium-pressure throttling orifice plates and medium-pressure shutoff valves are arranged on the heating pump pipelines.

Furthermore, the feed pump is also connected with a trench, and a stop valve is arranged on a pipeline from the feed pump to the trench.

Further, the warm pump system also comprises a power unit for providing power for the prepositive pump and the feed pump.

Further, the power unit comprises a motor and a gear box, the output end of the motor is connected with the front pump and the gear box, and the gear box is further connected with the feed water pump.

Further, the deaerator with be provided with the low pressure water feed valve on the pipeline between the leading pump, the both sides of low pressure water feed valve are connected with first bypass, be provided with low pressure shut-off valve and low pressure orifice plate on the first bypass.

Furthermore, a water supply recirculation regulating valve is arranged on a pipeline between the water supply pump and the deaerator, two sides of the water supply recirculation regulating valve are connected with a second bypass, and a high-pressure shut-off valve and a high-pressure throttling orifice plate are arranged on the second bypass.

Furthermore, the outlet end of the feed pump is connected with the boiler through a high-pressure feed pipe, and the high-pressure feed pipe is connected with a branch pipe for connecting the feed pump with the deaerator.

Further, the prepositive pump is a medium-pressure pump, and the feed water pump is a high-pressure pump.

The utility model discloses a working principle of heat pump system is, the middling pressure water of running state's leading pump flows from the exit end, divide two tunnel to flow into respectively and treat the leading pump of warm state and treat the feed pump of warm state, middling pressure water flows into the entry from the export of treating the leading pump of warm state and flows out, in the pipe says and flows in the oxygen-eliminating device, middling pressure water flows in the export from the entry of treating warm state feed pump and flows out, in the pipe says and flows in the oxygen-eliminating device, leading pump adopts the warm mode heat pump of falling, the feed pump adopts just warm mode heat pump.

The utility model discloses owing to adopt above technical scheme, make it compare with prior art, have following beneficial effect: the utility model discloses a heat pump system, the warm pump is carried out in leading pump and the feed pump of treating warm state is flowed into respectively to the middling pressure moisture two ways of the leading pump outflow of running state, leading pump adopts the mode heat pump of falling warm, the feed pump adopts just warm mode heat pump, can effectively avoid the potential safety hazard of pouring because of the high pressure water supply that different feedwater pressure grades are established ties and are brought, during the water flow equalization income oxygen-eliminating device behind the heat pump, can effectively retrieve the heat pump water, improve the safety and the economic nature of power plant.

Drawings

Fig. 1 is a schematic structural view of a water supply pump unit heating pump system with a front pump according to the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention. In the drawings, the size and relative sizes of certain features may be exaggerated for clarity.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; the term "connected" refers to a connection between two elements or an interaction between two elements, and the term is used in the present invention to be understood as a specific meaning for those skilled in the art.

In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", and the like are used in the orientation or positional relationship shown in the drawings, only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be considered as limiting the present invention.

Furthermore, in the description of the present invention, the terms "first" and "second" are used merely for descriptive distinction and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

As shown in the attached drawing 1 of the specification, the utility model provides a water-feeding pump group heating system with a preposed pump, including setting up at least two parallelly connected water supply lines between deaerator 1 and boiler 2, the structure and the connecting line on each water supply line are the same, so explain one of them water supply line in detail, preposed pump 3 and water-feeding pump 4 have been established ties in proper order on the water supply line, specifically, the entry end of preposed pump 3 is connected with deaerator 1, the exit end of preposed pump 3 passes through the pipeline and is connected with the entry end of water-feeding pump 4, the exit end of water-feeding pump 4 is connected with boiler 2, the exit end of water-feeding pump 4 still with deaerator 1 is connected, water-feeding pump 4 still is connected with trench 5; the heating pump system further comprises heating pump pipelines 6, the heating pump pipelines 6 are communicated with pipelines at the outlet ends of the preposed pumps 3, and medium-pressure throttling orifice plates 7 and medium-pressure shutoff valves 8 are arranged on the heating pump pipelines 6.

The water supply pump unit heating pump system of this embodiment contains two parallelly connected water supply pipelines, and two water supply pipelines are the same in structure, and one of them water supply pipeline is in running state, and another water supply pipeline is in the state of waiting to warm, and for the convenience of follow-up explanation, now define first water supply pipeline (the water supply pipeline on the left in the figure) as the running state, and the second water supply pipeline (the water supply pipeline on the right in the figure) is the state of waiting to warm, and wherein, serial number a represents running state pump package equipment, and serial number b represents the state of waiting to warm pump package equipment.

In this embodiment, the pre-pump 3 is preferably a medium pressure pump, the water feed pump 4 is preferably a high pressure pump, the water supply in the deaerator 1 is low pressure water, the low pressure water enters the pre-pump 3a in the running state through a pipeline and is pressurized, then, a part of the medium pressure water flowing out from the outlet end of the pre-pump 3a enters the water feed pump 3b, and is pressurized by the water feed pump 3b and then is supplied to the boiler 2 for use, a part of the medium pressure water flowing out from the outlet end of the pre-pump 3a in the running state is divided into two paths to respectively flow into the pre-pump 3b in the warming state and the water feed pump 4b for warming, the medium pressure water flowing out from the pre-pump 3a in the running state passes through the warm water pipeline 6 and then is communicated with the pipeline at the outlet end of the pre-pump 3b in the warming state, specifically, one path is that the medium pressure water flows into the inlet from the outlet of the pre-pump 3b in the warming state and enters the deaerator 1 through a pipeline to complete the warming pump of the pre-pump 3b, and the pre-pump 3b is in the back warming mode; and the other way is that medium-pressure water flows into and flows out from an inlet and an outlet of the water feeding pump 4b through a pipeline between the pre-pump 3b in the state of waiting for heating and the water feeding pump 4b in the state of waiting for heating, and flows into the deaerator 1 through the pipeline to finish the heating of the water feeding pump 4b, and the water feeding pump 4b adopts a positive heating mode.

The pre-pump 3b and the water feed pump 4b in the state to be heated are heated in a back-heating and positive-heating mode respectively, so that the potential safety hazard of high-pressure water supply backflow caused by series connection of systems with different water supply pressure grades can be effectively avoided, and the operation safety of the system is improved; preferably, a temperature sensor and a pressure sensor can be additionally arranged on each pipeline and used for monitoring the water temperature and the water pressure of each pipeline, and when the water temperature or the water pressure exceeds a threshold value, an alarm is given out, so that the system can be conveniently overhauled, and the running reliability of the system is improved.

In one embodiment, the heating pump pipeline 6 is provided with a medium-pressure orifice 7 and two medium-

pressure shutoff valves

8a and 8b, the two medium-pressure shutoff valves are arranged on two sides of the medium-pressure orifice 7, and medium-pressure water flowing out of the pre-pump in the running state sequentially passes through the medium-pressure shutoff valve 8a, the medium-pressure orifice 7 and the medium-pressure shutoff valve 8b and is communicated with an outlet end pipeline of the pre-pump 3b in the state of waiting to warm.

Optimizing a real-time mode, wherein the pump warming system further comprises a power unit for providing power for the pre-pump 3 and the water feeding pump 4, the pre-pump 3a and the water feeding pump 4a in an operation state share one power unit, and the pre-pump 3b and the water feeding pump 3b in a to-be-warmed state share the other power unit; the power unit comprises a motor 9 and a gear box 10, specifically, for the operation state pump group equipment, the output end of the motor 9a is connected with a front pump 3a and the gear box 10a, the motor 9a drives the front pump 3a to operate, the motor 9a is meshed with the gear box 10a through a gear, the gear box 10a is meshed with a water feeding pump 4a through a gear, and the motor 9a can drive the front pump 3a and the water feeding pump 4a to operate; for the pump set equipment in the state of waiting to warm, the output end of a motor 9b is connected with a front pump 3b and a gear box 10b, the motor 9b drives the front pump 3b to operate, the motor 9b is meshed with the gear box 10b through a gear, the gear box 10b is meshed with a water feeding pump 4b through a gear, and the motor 9b can drive the front pump 3b and the water feeding pump 4b to operate; of course, the power unit may comprise two motors driving the pre-pump 3 and the feed pump 4 to operate, respectively.

As one of the implementation modes, a low-pressure water supply valve 11 is arranged on a pipeline between the deaerator 1 and the pre-pump 3, two sides of the low-pressure water supply valve 11 are connected with first bypass, two low-pressure shut-off valves 12 and one low-pressure orifice plate 13 are arranged on the first bypass, when the pipeline is in a running state, the low-pressure water supply valve 11a can be opened, the low-pressure shut-off valve 12a on the first bypass is closed or reduced, and when the pipeline is in a standby heating state, the low-pressure water supply valve 11a can be closed, and the low-pressure shut-off valve 12b can be opened; the specific process is that low-pressure water in the deaerator 1 enters the pre-pump 3a in the running state through the low-pressure water supply valve 11a, the low-pressure water flows out from the outlet end after being pressurized by the pre-pump 3a, flows into the inlet from the outlet of the pre-pump 3b in the to-be-warmed state after passing through the warming pump pipeline 6, and flows into the deaerator 1 after passing through the low-pressure shutoff valve 12b in the to-be-warmed state, the low-pressure throttling orifice plate 13b and the low-pressure shutoff valve 12 b.

As one embodiment, a feed water recirculation regulating valve 14 is arranged on a pipeline between the feed water pump 4 and the deaerator 1, a second bypass is connected to two sides of the feed water recirculation regulating valve 14, two high-pressure shut-off valves 15 and one high-pressure throttle orifice 16 are arranged on the second bypass, when the system is started, the feed water recirculation regulating valve 14 can be opened for feed water circulation, when the system is in an operating state, the feed water recirculation regulating valve 14a and the high-pressure shut-off valves 15a can be closed or reduced, the outlet end of the feed water pump 4a in the operating state is connected with the boiler 2 and is used for supplying water to the boiler 2, and when the pipeline is in a state to be heated, the feed water recirculation regulating valve 14b can be closed, and the high-pressure shut-off valve 15b can be opened; the specific process is that the medium-pressure water at the outlet end of the pre-pump 3a in the running state flows through the pipeline between the pre-pump 3b in the state of waiting to warm and the water feed pump 4b after passing through the pump warming pipeline 6, flows into the inlet and the outlet of the water feed pump 4b, flows through the high-pressure shutoff valve 15b in the state of waiting to warm, the high-pressure throttle orifice 16b and the high-pressure shutoff valve 15b, and flows into the deaerator 1.

Refine the embodiment, water-feeding pump 4 still is connected with trench 5, and running state water-feeding pump 4a arrives be provided with stop valve 17a on trench 5's the pipeline, treat warm state water-feeding pump 4b and arrive be provided with stop valve 17b on trench 5's the pipeline, the heat pump in-process, if meet the condition such as high-pressure shut-off valve 15b or high-pressure orifice 16b trouble for when the middling pressure feedwater that flows into water-feeding pump 4b of treating warm state can't flow into oxygen-eliminating device 1, can open the stop valve 17b of treating warm state, will flow into the middling pressure feedwater of treating water-feeding pump 4b of warm state and arrange to trench 5, conveniently overhaul the change to the fault point.

And those not described in detail in this specification are well within the skill of those in the art.

It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope of the invention. Although the embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to such embodiments, and that changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A water-feeding pump group heating system with a pre-pump comprises at least two parallel water supply pipelines arranged between a deaerator and a boiler, and is characterized in that the water supply pipelines are provided with the pre-pump and the water-feeding pump, the inlet end of the pre-pump is connected with the deaerator, the outlet end of the pre-pump is connected with the inlet end of the water-feeding pump through a pipeline, the outlet end of the water-feeding pump is connected with the boiler, and the outlet end of the water-feeding pump is also connected with the deaerator; the heating pump system further comprises heating pump pipelines which are communicated with pipelines at the outlet ends of the front pumps, and medium-pressure throttling orifice plates and medium-pressure shutoff valves are arranged on the heating pump pipelines.

2. The feed pump group heating pump system with the front pump as claimed in claim 1, wherein a trench is further connected to the feed pump, and a stop valve is arranged on a pipeline from the feed pump to the trench.

3. The feedwater pump bank warm pump system of claim 1, further comprising a power unit that powers the pre-pump and the feedwater pump.

4. The feedwater pump bank warm pump system of claim 3, wherein the power unit comprises a motor and a gearbox, an output of the motor is connected with the pre-pump and the gearbox, and the feedwater pump is further connected with the gearbox.

5. The feed pump group warming pump system with the pre-pump as claimed in claim 1, wherein a low pressure feed valve is arranged on a pipeline between the deaerator and the pre-pump, a first bypass is connected to two sides of the low pressure feed valve, and a low pressure shut-off valve and a low pressure orifice plate are arranged on the first bypass.

6. The feed pump group warming pump system with the pre-pump as claimed in claim 1, wherein a feed water recirculation regulating valve is arranged on a pipeline between the feed pump and the deaerator, a second bypass is connected to two sides of the feed water recirculation regulating valve, and a high pressure shut-off valve and a high pressure orifice plate are arranged on the second bypass.

7. The feed pump group warming pump system with the pre-pump as claimed in claim 1, wherein an outlet end of the feed pump is connected with the boiler through a high pressure feed pipe, and a branch pipe is connected with the high pressure feed pipe for connecting the feed pump with the deaerator.

8. The feed pump group warming pump system with a pre-pump of claim 1, wherein the pre-pump is a medium pressure pump and the feed pump is a high pressure pump.