阅读说明：本技术 溢流水回收方法及系统 (Overflow water recovery method and system ) 是由 高嵩 付灿平 于 2019-07-18 设计创作，主要内容包括：本发明提供一种溢流水回收方法及系统,其中,溢流水回收系统包括发电机定子冷却水箱、排污坑和连通发电机定子冷却水箱和排污坑的第一管路；汽轮机轴封、轴封加热器和连通汽轮机轴封和轴封加热器的第二管路；连通第一管路和第二管路的第三管路,第一管路与排污坑的接口为第一接口,第一管路与第三管路的接口为第二接口,第一接口和第二接口之间设置有第一阀门。通过第三管路将第一管路和第二管路连通,并且在第一接口和第二接口之间设置第一阀门,可通过关闭第一阀门,使得溢流水经过第三管路和第二管路流至轴封加热器后回收至凝汽器,将溢流水回收后循环利用,该溢流水回收系统具有能够回收水资源,降低生产成本和减少废水排放优点。(The invention provides an overflow water recovery method and system, wherein the overflow water recovery system comprises a generator stator cooling water tank, a sewage draining pit and a first pipeline communicated with the generator stator cooling water tank and the sewage draining pit; the steam turbine shaft seal heater is communicated with the steam turbine shaft seal; and the third pipeline is communicated with the first pipeline and the second pipeline, the interface of the first pipeline and the drain pit is a first interface, the interface of the first pipeline and the third pipeline is a second interface, and a first valve is arranged between the first interface and the second interface. Through the third pipeline with first pipeline and second pipeline intercommunication to set up first valve between first interface and second interface, the first valve is closed to the accessible, makes the overflow water flow to the shaft seal heater through third pipeline and second pipeline and retrieves to the condenser after, with the recycle behind the overflow water recovery, this overflow water recovery system has can the water reclamation resource, reduction in production cost and reduction wastewater discharge advantage.)

1. An overflow water recovery system, comprising:

the system comprises a generator stator cooling water tank, a sewage draining pit and a first pipeline communicated with the generator stator cooling water tank and the sewage draining pit;

the steam turbine shaft seal heating device comprises a steam turbine shaft seal, a shaft seal heater and a second pipeline which is communicated with the steam turbine shaft seal and the shaft seal heater;

and the third pipeline is communicated with the first pipeline and the second pipeline, the interface of the first pipeline and the sewage draining pit is a first interface, the interface of the first pipeline and the third pipeline is a second interface, and a first valve is arranged between the first interface and the second interface.

2. The overflow water recovery system of claim 1, wherein the interface between the second conduit and the third conduit is a third interface, and a second valve is disposed between the second interface and the third interface.

3. The overflow water recovery system of claim 2, wherein the third pipeline comprises a U-shaped section and an extension section, the U-shaped section comprises a first section, a second section and a third section which are sequentially communicated, the first section is communicated with the first pipeline, the third section is communicated with the second pipeline, and the extension section is communicated with the sewage draining pit and the first section.

4. The overflow water recovery system of claim 3, wherein the third section is provided with the second valve.

5. The overflow water recovery system of any one of claims 1-4, wherein the first conduit has the same tube diameter as the third conduit.

6. The overflow water recovery system of any one of claims 1-4, further comprising a condenser and a fourth conduit, wherein the shaft seal heater is in communication with the condenser via the fourth conduit.

7. The overflow water recovery system of any one of claims 1-4, wherein the drainage pit is a trench.

8. The overflow water recovery system of any one of claims 1-4, further comprising a drain in communication with the shaft seal heater.

9. The method for recovering the overflow water is characterized in that an overflow water recovery system is adopted, and the overflow water recovery system comprises a generator stator cooling water tank, a sewage discharge pit and a first pipeline communicated with the generator stator cooling water tank and the sewage discharge pit; the steam turbine shaft seal heating device comprises a steam turbine shaft seal, a shaft seal heater and a second pipeline which is communicated with the steam turbine shaft seal and the shaft seal heater; and a third pipeline communicating the first pipeline and the second pipeline; the shaft seal heater is communicated with the condenser through the fourth pipeline, and the overflow water recovery method comprises the following steps:

controlling overflow water to flow from the generator stator cooling water tank into the first pipeline;

controlling overflow water to flow out of the first pipeline and flow into the second pipeline through the third pipeline;

controlling overflow water to flow out of the second pipeline, flow into the fourth pipeline through the shaft seal heater;

and controlling overflow water to flow out of the fourth pipeline and enter the condenser.

10. The overflow water recovery method of claim 9, wherein the overflow water recovery system further comprises a first valve disposed in the first conduit and a second valve disposed in the third conduit, and wherein prior to the step of controlling the flow of overflow water from the generator stator cooling water tank into the first conduit, further comprising:

and closing the first valve and opening the second valve.

Technical Field

The invention relates to the field of water recovery systems, in particular to an overflow water recovery method and system.

Background

According to the design of manufacturers and productsThe use specification stipulates that the generator stator cold water system is continuous small-flow water replenishing overflow, continuous water replenishing can ensure that the water quality of cooling water meets the requirements, and possible water leakage loss in the system can be compensated. And the generator stator cooling water is cut off water and can trigger the generator to trip and protect the action, and the volume of the generator stator cooling water tank is very small and is only 0.3m³(taking the million units of Siemens technology as an example above), if a continuous water replenishing overflow mode is not adopted, the reaction time left for operators when the working medium leaks in the system is short, and the safety risk coefficient of the unit is high. In the prior art, a generator stator cold water system adopts high-quality demineralized water for continuous small-flow water supplement, the continuous water supplement amount is generally 100-200L/H, equivalent overflow water can be generated during water supplement, and the overflow water is directly discharged without being recovered, so that great economic waste and environmental pollution can be caused. (the price of the desalted water is 9 yuan/ton, about 1700 tons of overflow water of each unit is produced each year, and 15300 yuan is directly lost each unit each year). In addition, the pressure of the demineralized water fluctuates when the water consumption of other users is large, and the condition that the pressure is lower than the minimum pressure required by the stator cooling water replenishing is often generated. Adopt other transformation thinking, still can not thoroughly guarantee water tank water level safety if increase liquid level switch and moisturizing solenoid valve.

In view of the above, there is a need for a new overflow water recovery system that solves or at least alleviates the above technical drawbacks.

Disclosure of Invention

The invention mainly aims to provide an overflow water recovery method and system, and aims to solve the technical problems of economic loss and environmental pollution caused by direct discharge of overflow water in the prior art.

To achieve the above object, the present invention provides an overflow water recovery system, comprising:

the system comprises a generator stator cooling water tank, a sewage draining pit and a first pipeline communicated with the generator stator cooling water tank and the sewage draining pit;

the steam turbine shaft seal heating device comprises a steam turbine shaft seal, a shaft seal heater and a second pipeline which is communicated with the steam turbine shaft seal and the shaft seal heater;

and the third pipeline is communicated with the first pipeline and the second pipeline, the interface of the first pipeline and the sewage draining pit is a first interface, the interface of the first pipeline and the third pipeline is a second interface, and a first valve is arranged between the first interface and the second interface.

Preferably, an interface between the second pipeline and the third pipeline is a third interface, and a second valve is arranged between the second interface and the third interface.

Preferably, the third pipeline comprises a U-shaped section and an extension section, the U-shaped section comprises a first section, a second section and a third section which are sequentially communicated, the first section is communicated with the first pipeline, the third section is communicated with the second pipeline, and the extension section is communicated with the sewage draining pit and the first section.

Preferably, the third section is provided with the second valve.

Preferably, the pipe diameter of the first pipeline is the same as the pipe diameter of the third pipeline.

Preferably, the overflow water recovery system further comprises a condenser and a fourth pipeline, and the shaft seal heater is communicated with the condenser through the fourth pipeline.

Preferably, the drain pit is a trench.

Preferably, the overflow water recovery system further comprises a drain pipe in communication with the shaft seal heater.

The invention also provides an overflow water recovery method which is characterized in that an overflow water recovery system is adopted, and the overflow water recovery system comprises a generator stator cooling water tank, a sewage discharge pit and a first pipeline communicated with the generator stator cooling water tank and the sewage discharge pit; the steam turbine shaft seal heating device comprises a steam turbine shaft seal, a shaft seal heater and a second pipeline which is communicated with the steam turbine shaft seal and the shaft seal heater; and a third pipeline communicating the first pipeline and the second pipeline; the shaft seal heater is communicated with the condenser through the fourth pipeline, and the overflow water recovery method comprises the following steps:

controlling overflow water to flow from the generator stator cooling water tank into the first pipeline;

controlling overflow water to flow out of the first pipeline and flow into the second pipeline through the third pipeline;

controlling overflow water to flow out of the second pipeline, flow into the fourth pipeline through the shaft seal heater;

and controlling overflow water to flow out of the fourth pipeline and enter the condenser.

Preferably, the overflow water recovery system further includes a first valve disposed in the first pipeline and a second valve disposed in the third pipeline, and before the step of controlling the flow of the overflow water from the generator stator cooling water tank to the first pipeline, the overflow water recovery system further includes:

and closing the first valve and opening the second valve.

In the technical scheme of the invention, the overflow water recovery system comprises a generator stator cooling water tank, a sewage draining pit and a first pipeline communicated with the generator stator cooling water tank and the sewage draining pit; the steam turbine shaft seal heater is communicated with the steam turbine shaft seal; and the third pipeline is communicated with the first pipeline and the second pipeline, the interface of the first pipeline and the drain pit is a first interface, the interface of the first pipeline and the third pipeline is a second interface, and a first valve is arranged between the first interface and the second interface. Through the third pipeline with first pipeline and second pipeline intercommunication, with be connected generator stator cooling water tank system and these two irrelevant systems of bearing seal system through the third pipeline, and set up first valve between first interface and second interface, first valve is closed to the accessible, make overflow water flow to the bearing seal heater through third pipeline and second pipeline, recycle after retrieving overflow water, this overflow water recovery system has can the water reclamation resource, reduction in production cost and reduction waste water discharge advantage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of an overflow water recovery system of the present invention;

FIG. 2 is a schematic view of a third circuit of the present invention;

FIG. 3 is a schematic flow chart of a first embodiment of the overflow water recovery method of the present invention;

FIG. 4 is a schematic flow chart of a second embodiment of the overflow water recovery method of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions 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 apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that all the directional indicators (such as the upper and lower … …) in the embodiment of the present invention are only used to explain the relative position relationship, movement, etc. of the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

It should be noted that the shaft seal heater in the shaft seal system 30 is a device for recovering shaft seal leakage steam and heating condensed water by using heat thereof, and can reduce energy loss and improve heat efficiency of the unit. When the steam turbine adopts the internal-discharge type shaft seal system 30, a shaft seal heater is generally arranged for heating condensed water or demineralized water and recovering shaft seal leakage steam, thereby reducing shaft seal leakage steam, improving the vacuum and heat loss of a unit and improving the environmental conditions of a workshop. In the prior art, the shaft seal system 30 and the generator stator cooling water system 40 are two completely unrelated systems.

Referring to fig. 1, the present invention provides an overflow water recovery system 20 comprising:

the generator stator cooling water tank 1, the sewage draining pit 2 and a first pipeline 7 for communicating the generator stator cooling water tank 1 and the sewage draining pit 2;

the steam turbine shaft seal heating device comprises a steam turbine shaft seal 3, a shaft seal heating device 4 and a second pipeline 8 for communicating the steam turbine shaft seal 3 and the shaft seal heating device 4;

and the third pipeline 9 is communicated with the first pipeline 7 and the second pipeline 8, the interface of the first pipeline 7 and the sewage draining pit 2 is a first interface 10, the interface of the first pipeline 7 and the third pipeline 9 is a second interface 11, and a first valve 5 is arranged between the first interface 10 and the second interface 11.

In the above embodiment, the first pipeline 7 and the second pipeline 8 are communicated through the third pipeline 9, so as to connect two unrelated systems, namely the generator stator cooling water system 40 and the shaft seal system 30, through the third pipeline 9, and the first valve 5 is arranged between the first interface 10 and the second interface 11, the first valve 5 can be closed, so that the overflow water flows to the shaft seal heater 4 through the third pipeline 9 and the second pipeline 8, and the overflow water is recycled after being recovered.

According to a preferred embodiment of the invention, the interface between the second line 8 and the third line 9 is a third interface 12, and a second valve 6 is arranged between the second interface 11 and the third interface 12. The second valve 6 can be closed when overflow water does not need to be recovered or is inconvenient to recover, the second valve 6 is arranged to mainly play a role in insurance, and the overflow water is prevented from being recovered by mistakenly opening the first valve 5 under the condition that the overflow water does not need to be recovered. The overflow water of the stator cooling water system can be freely and selectively recycled or discharged through valve control. The first valve 5 and the second valve 6 may be manual valves or electric valves (e.g., electronic expansion valves).

Referring to fig. 2, the third pipeline 9 includes a U-shaped section and an extended section 94, the access height of the U-shaped section is calculated according to the height of the cooling water tank of the generator stator, the U-shaped section includes a first section 91, a second section 92 and a third section 93 which are sequentially communicated, the first section 91 is communicated with the first pipeline 7, the third section 93 is communicated with the second pipeline 8, and the extended section 94 is communicated with the sewage drainage pit 2 and the first section 91. The U-shaped section is designed to form water sealing sections at two ends of the U-shaped section, so that the steam leakage phenomenon between systems is prevented. The height of the U-shaped water seal pipe section is determined by calculation according to the negative pressure of the shaft seal system 30, so that the phenomenon of steam leakage among systems is avoided. In the embodiment, two originally unrelated systems are skillfully combined by only adding the third pipeline 9 and the first valve 5 to the original system to form a new overflow water recovery system 20, so that the design is exquisite and the modification cost is low.

Referring to fig. 2, the third section 93 is provided with a second valve 6, the second valve 6 is arranged on the third section 93, and the second valve 6 is used for controlling to disconnect or connect the shaft seal system 30 and the generator stator cooling water system. The design can not influence the overflow water to enter the drain pit 2 because of the closing of the second valve 6, and can freely control whether to recover the overflow water.

In addition, the pipe diameter of the first pipeline 7 is the same as that of the third pipeline 9, and the pipe diameter of the pipeline through which the overflow water flows is the same, so that the pressure generated by the change of the pipe diameter can not influence the flow of the overflow water.

Referring to fig. 1, the overflow water recovery system 20 further includes a condenser 15 and a fourth pipeline 14, and the shaft seal heater 4 and the condenser 15 are communicated through the fourth pipeline 14. The condenser 15 is a heat exchanger for condensing the exhaust steam into water, and overflow steam from the shaft seal heater 4 enters the condenser 15 for condensation and recovery, and then is recycled.

Furthermore, the sewage draining pit 2 is a trench, and overflow water is drained into the trench conveniently and quickly.

Further, the overflow water recovery system 20 further comprises a fan 16 communicated with the shaft seal heater 4, the number of the fans 16 can be two, and the main purpose of the fan 16 is to discharge non-condensable gas in the shaft seal heater 4.

In addition, the overflow water recovery system 20 further comprises a small shaft seal 17 communicated with the shaft seal heater 4, the shaft seal system 30 comprises a steam turbine shaft seal 3 and the small shaft seal 17, the shaft seal heater 4 is respectively communicated with the steam turbine shaft seal 3 and the small shaft seal 17, shaft seal leakage can be recovered, and condensate water is heated by using heat of the shaft seal leakage, so that shaft seal leakage and heat loss are reduced, and environmental conditions of a workshop are improved.

In addition, the overflow water recovery system 20 further includes a drain pipe 18 in communication with the shaft seal heater 4, and the drain pipe 18 may be a low level drain header for draining excess water in the shaft seal heater 4.

Referring to fig. 3, the invention also provides an overflow water recovery method, which adopts an overflow water recovery system, wherein the overflow water recovery system comprises a generator stator cooling water tank 1, a sewage disposal pit 2 and a first pipeline 7 for communicating the generator stator cooling water tank 1 and the sewage disposal pit 2; the steam turbine shaft seal heating device comprises a steam turbine shaft seal 3, a shaft seal heating device 4 and a second pipeline 8 for communicating the steam turbine shaft seal 3 and the shaft seal heating device 4; and a third line 9 communicating the first line 7 with the second line 8; the shaft seal heater 4 is communicated with the condenser 15 through the fourth pipeline 14, and the overflow water recovery method comprises the following steps:

s200, controlling overflow water to flow into a first pipeline 7 from the generator stator cooling water tank 1;

s300, controlling overflow water to flow out of the first pipeline 7 and flow into the second pipeline 8 through the third pipeline 9;

s400, controlling the overflow water to flow out of the second pipeline 8 and flow into the fourth pipeline 14 through the shaft seal heater 4;

and S500, controlling the overflow water to flow out of the fourth pipeline 14 and enter the condenser 15.

The first pipeline 7 and the second pipeline 8 are communicated through a third pipeline 9, so that two unrelated systems, namely a generator stator cooling water system 40 and a shaft seal system 30, are connected through the third pipeline 9, overflow water flows to the shaft seal heater 4 through the third pipeline 9 and the second pipeline 8, and flows into the condenser 15 through the fourth pipeline 14 from the shaft seal heater 4 for condensation and recovery. The overflow water is recycled, and the overflow water recycling method has the advantages of being capable of recycling water resources, reducing production cost and reducing waste water discharge.

The third pipeline 9 comprises a U-shaped section and an extension section 94, the connection height of the U-shaped section is obtained by calculation according to the height of the cooling water tank of the generator stator, the U-shaped section comprises a first section 91, a second section 92 and a third section 93 which are sequentially communicated, the first section 91 is communicated with the first pipeline 7, the third section 93 is communicated with the second pipeline 8, and the extension section 94 is communicated with the sewage drainage pit 2 and the first section 91. The U-shaped section is designed to form water sealing sections at two ends of the U-shaped section, so that the steam leakage phenomenon between systems is prevented. The height of the U-shaped water seal pipe section is determined by calculation according to the negative pressure of the shaft seal system 30, so that the phenomenon of steam leakage among systems is avoided. In the embodiment, two originally unrelated systems are skillfully combined by only adding the third pipeline 9 and the first valve 5 to the original system to form a new overflow water recovery system 20, so that the design is exquisite and the modification cost is low.

Furthermore, the overflow water recovery system further comprises a first valve 5 disposed in the first pipeline 7 and a second valve 6 disposed in the third pipeline 9, and referring to fig. 4, in another embodiment, before the step of controlling the flow of the overflow water from the generator stator cooling water tank 1 into the first pipeline 7, the method further comprises:

and S100, closing the first valve 5 and opening the second valve 6.

A first valve 5 is arranged between the first port 10 and the second port 11, and the second valve 6 can be opened by closing the first valve 5, so that overflow water flows to the shaft seal heater 4 through the third pipe 9 and the second pipe 8.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical spirit of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.