阅读说明：本技术 一种循环水低真空供暖系统 (Circulating water low-vacuum heating system ) 是由 开金龙 刘宏 徐建东 于 2021-09-13 设计创作，主要内容包括：本发明提供一种循环水低真空供暖系统,包括：汽轮机冷凝器,所述汽轮机冷凝器的输出端通过冷却输送管连接有冷却塔,所述冷却塔的输入端通过所述冷却输送管与所述汽轮机冷凝器的输出端相互连接,所述冷却塔的输出端与所述汽轮机冷凝器的输入端之间通过冷却回流管相互连接。本发明通过调整降低汽轮机凝汽器真空度,使汽轮机凝汽器的排汽温度升高以加热冷却循环水,而温度升高的冷却循环水可以通过循环输送管输送至换热器,经过换热器利用蒸汽进一步将循环水加热,以通过输送至供暖管道供居民采暖使用,经采暖的暖气片散热后循环水降温回流至汽轮机凝汽器,以降低汽轮机的排汽温度,组成一个循环水的供暖系统以减少热量和水分损失。(The invention provides a circulating water low-vacuum heating system, comprising: the steam turbine condenser, the output of steam turbine condenser has the cooling tower through cooling duct connections, the input of cooling tower passes through the cooling duct with the output interconnect of steam turbine condenser, the output of cooling tower with through cooling back flow interconnect between the input of steam turbine condenser. The invention reduces the vacuum degree of the steam turbine condenser through adjustment, so that the exhaust temperature of the steam turbine condenser is raised to heat the cooling circulating water, the cooling circulating water with the raised temperature can be conveyed to the heat exchanger through the circulating conveying pipe, the circulating water is further heated by steam through the heat exchanger and is conveyed to the heating pipeline for heating by residents, the circulating water is cooled and flows back to the steam turbine condenser after being radiated by the heating radiator to reduce the exhaust temperature of the steam turbine, and a circulating water heating system is formed to reduce the heat and moisture loss.)

1. A circulating water low vacuum heating system, comprising:

the output end of the steam turbine condenser is connected with a cooling tower through a cooling conveying pipe, the input end of the cooling tower is connected with the output end of the steam turbine condenser through the cooling conveying pipe, the output end of the cooling tower is connected with the input end of the steam turbine condenser through a cooling return pipe, and a cooling tower circulating pump is arranged in the middle of the cooling return pipe;

a cooling tower isolation valve is arranged in the middle of the cooling delivery pipe, and a circulating delivery pipe is connected in the middle of the cooling delivery pipe between the cooling tower isolation valve and the output end of the steam turbine condenser;

the middle of the circulating conveying pipe is provided with a steam-driven circulating pump and an electric circulating pump in parallel, the middle of the circulating conveying pipe is also provided with a plurality of basic heat exchangers and spike heat exchangers in parallel, and the output ends of the steam-driven circulating pump and the electric circulating pump are connected with the input ends of the basic heat exchangers and the spike heat exchangers through the circulating conveying pipe;

the output ends of the basic heat exchanger and the peak heat exchanger are connected with a heating water supply pipe, and the heating water supply pipe is connected with a heating water return pipe through a heating sheet;

the heating water return pipe is connected with the cooling return pipe, and the connecting point of the heating water return pipe and the cooling return pipe is positioned on the rear side of the output end of the cooling tower circulating pump.

2. The circulating water low vacuum heating system of claim 1, wherein a heating water inlet valve is provided between a connection point of the circulating delivery pipe and the cooling return pipe and input ends of the steam-driven circulation pump and the electric circulation pump, and the cooling return pipe is connected with the input ends of the steam-driven circulation pump and the electric circulation pump through the circulating delivery pipe and the heating water inlet valve.

3. The circulating water low-vacuum heating system as claimed in claim 1, wherein a return water isolation valve is disposed in the middle of the heating return pipe, and the heating return pipe is connected to the cooling return pipe through the return water isolation valve.

4. The circulating water low vacuum heating system of claim 1, wherein circulation isolation valves are disposed on the front and rear sides of the cooling tower circulating pump, and the input and output ends of the cooling tower circulating pump are connected to the cooling return pipe through the circulation isolation valves disposed on the front and rear sides, respectively.

5. The circulating water low vacuum heating system of claim 1, wherein a circulating connection pipe is connected between the circulating conveying pipe and the heating water return pipe, and a water return connection valve is arranged in the middle of the circulating connection pipe.

6. The circulating water low vacuum heating system of claim 3, wherein the connection point of the circulating connection pipe and the heating return pipe is located at the front side of the return water isolation valve, and the connection point of the circulating connection pipe and the circulating delivery pipe is located between the heating water inlet valve and the input ends of the pneumatic circulating pump and the electric circulating pump.

7. The circulating water low vacuum heating system as claimed in claim 1, wherein a first temperature monitor is provided in the middle of the cooling return pipe, a second temperature monitor is provided in the middle of the circulating delivery pipe, and a third temperature monitor is provided in the middle of the heating supply pipe.

8. The circulating water low vacuum heating system of claim 1, wherein the output ends of the steam circulating pump and the electric circulating pump are provided with pressure monitors.

9. The circulating water low-vacuum heating system as claimed in claim 1, wherein a cyclone dirt separator is disposed in the middle of the heating water return pipe.

10. A circulating water low vacuum heating system as claimed in claim 1, wherein the output of the turbine condenser is provided with a pressure relief valve.

Technical Field

One or more embodiments of this description relate to electricity generation cooling technical field, especially relate to a circulating water low vacuum heating system.

Background

Superheated steam generated by a boiler enters a steam turbine to perform expansion work so as to drive blades to drive a generator to generate power, waste steam after work is performed is sent back to the boiler for recycling through a condenser, a circulating water pump, a condensate pump, a feed water heating device and the like, exhaust steam of a steam turbine generator unit of a biomass power plant discharges a heat source into the atmosphere through a cooling tower, evaporation latent heat is taken away, the temperature of circulating water is reduced, and therefore vacuum and exhaust steam temperature of the steam condenser of the steam turbine generator are guaranteed, and safe and economic operation of the unit is guaranteed.

The applicant finds that heat waste is caused by a mode of reducing the temperature of circulating water through heat dissipation of a cooling tower, loss heat accounts for about 30% of input heat of a power plant, and water resource waste can also be caused by water evaporation loss due to an open heat dissipation mode.

Disclosure of Invention

In view of this, an object of one or more embodiments of the present disclosure is to provide a circulating water low vacuum heating system, so as to solve the problems that heat is wasted due to a manner of reducing a temperature of circulating water through heat dissipation of a cooling tower, loss of heat accounts for about 30% of input heat of a power plant, and water resources are wasted due to evaporation loss of water due to an open heat dissipation manner.

In view of the above, one or more embodiments of the present disclosure provide a circulating water low vacuum heating system, including:

the output end of the steam turbine condenser is connected with a cooling tower through a cooling conveying pipe, the input end of the cooling tower is connected with the output end of the steam turbine condenser through the cooling conveying pipe, the output end of the cooling tower is connected with the input end of the steam turbine condenser through a cooling return pipe, and a cooling tower circulating pump is arranged in the middle of the cooling return pipe;

a cooling tower isolation valve is arranged in the middle of the cooling delivery pipe, and a circulating delivery pipe is connected in the middle of the cooling delivery pipe between the cooling tower isolation valve and the output end of the steam turbine condenser;

the middle of the circulating conveying pipe is provided with a steam-driven circulating pump and an electric circulating pump in parallel, the middle of the circulating conveying pipe is also provided with a plurality of basic heat exchangers and spike heat exchangers in parallel, and the output ends of the steam-driven circulating pump and the electric circulating pump are connected with the input ends of the basic heat exchangers and the spike heat exchangers through the circulating conveying pipe;

the output ends of the basic heat exchanger and the peak heat exchanger are connected with a heating water supply pipe, and the heating water supply pipe is connected with a heating water return pipe through a heating sheet;

the heating water return pipe is connected with the cooling return pipe, and the connecting point of the heating water return pipe and the cooling return pipe is positioned on the rear side of the output end of the cooling tower circulating pump.

In some optional embodiments, a heating water inlet valve is disposed between a connection point of the circulation duct and the cooling return pipe and input ends of the steam-driven circulation pump and the electric circulation pump, and the cooling return pipe is connected to the input ends of the steam-driven circulation pump and the electric circulation pump through the circulation duct and the heating water inlet valve.

In some optional embodiments, a return water isolation valve is arranged in the middle of the heating return pipe, and the heating return pipe is connected with the cooling return pipe through the return water isolation valve.

In some optional embodiments, isolation valves are disposed on both the front and rear sides of the cooling tower circulation pump, and the input end and the output end of the cooling tower circulation pump are connected to the cooling return pipe through the isolation valves disposed on the front and rear sides, respectively.

In some optional embodiments, a circulating connection pipe is connected between the circulating conveying pipe and the heating water return pipe, and a water return connection valve is arranged in the middle of the circulating connection pipe.

In some optional embodiments, the connection point of the circulation connection pipe and the heating water return pipe is positioned at the front side of the water return isolation valve, and the connection point of the circulation connection pipe and the circulation conveying pipe is positioned between the heating water inlet valve and the input ends of the steam circulating pump and the electric circulating pump.

In some optional embodiments, a first temperature monitor is arranged in the middle of the cooling return pipe, a second temperature monitor is arranged in the middle of the circulation conveying pipe, and a third temperature monitor is arranged in the middle of the heating water supply pipe.

In some optional embodiments, the output ends of the steam-driven circulating pump and the electric circulating pump are provided with pressure monitors.

In some optional embodiments, a cyclone dirt separator is arranged in the middle of the heating water return pipe.

In some optional embodiments, the output end of the turbine condenser is provided with a pressure relief valve.

As can be seen from the above, in the circulating water low vacuum heating system provided in one or more embodiments of the present disclosure, a heating pipeline is connected to a circulating pipeline between a steam turbine condenser and a cooling tower, the vacuum degree of the steam turbine condenser is reduced by adjustment to raise the exhaust steam temperature of the steam turbine condenser, then the temperature of the cooling circulating water is raised by heat exchange of the steam turbine condenser, the raised cooling circulating water can be conveyed to a heat exchanger through a circulating conveying pipe, the circulating water is further heated by steam through the heat exchanger, and is conveyed to a heating pipeline for resident heating, after heat dissipation by a heating radiator, the temperature of the circulating water is reduced and flows back to the steam turbine condenser, so as to reduce the exhaust steam temperature of the steam turbine, raise the temperature of the circulating water, and form a circulating water heating system, which can collect and utilize heat lost from an original cooling tower, reduce the heat loss and the water resource waste caused by the water evaporation.

Drawings

In order to more clearly illustrate one or more embodiments of the present disclosure or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, it is obvious that the drawings in the following description are only examples of one or more embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic block diagram of one or more embodiments of the present disclosure;

FIG. 2 is a schematic block diagram of one or more embodiments of the present disclosure.

Detailed Description

To make the objects, aspects and advantages of one or more embodiments of the present disclosure more apparent, one or more embodiments of the present disclosure are described in further detail below with reference to specific embodiments.

It is to be understood that unless otherwise defined, technical or scientific terms used herein with respect to one or more embodiments of the present disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar language in one or more embodiments of the present description is not intended to imply any order, quantity, or importance, but rather the intention is to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In one or more embodiments of the present disclosure, a circulating water low vacuum heating system includes:

the system comprises a steam turbine condenser 1, wherein the output end of the steam turbine condenser 1 is connected with a cooling tower 4 through a cooling conveying pipe 2, the input end of the cooling tower 4 is connected with the output end of the steam turbine condenser 1 through the cooling conveying pipe 2, the output end of the cooling tower 4 is connected with the input end of the steam turbine condenser 1 through a cooling return pipe 3, and a cooling tower circulating pump 6 is arranged in the middle of the cooling return pipe 3;

a cooling tower isolation valve 5 is arranged in the middle of the cooling delivery pipe 2, and a circulating delivery pipe 8 is connected in the middle of the cooling delivery pipe 2 between the cooling tower isolation valve 5 and the output end of the steam turbine condenser 1;

the middle of the circulating conveying pipe 8 is provided with a steam-driven circulating pump 9 and an electric circulating pump 10 in parallel, the middle of the circulating conveying pipe 8 is also provided with a plurality of basic heat exchangers 11 and peak heat exchangers 12 in parallel, and the output ends of the steam-driven circulating pump 9 and the electric circulating pump 10 are connected with the input ends of the basic heat exchangers 11 and the peak heat exchangers 12 through the circulating conveying pipe 8;

the output ends of the basic heat exchanger 11 and the peak heat exchanger 12 are connected with a heating water supply pipe 13, and the heating water supply pipe 13 is connected with a heating water return pipe 16 through a heating sheet 15;

the heating water return pipe 16 and the cooling return pipe 3 are connected with each other, and the connection point of the heating water return pipe 16 and the cooling return pipe 3 is positioned at the rear side of the output end of the cooling tower circulating pump 6.

Referring to fig. 1 to 2, as an embodiment of the present invention, a circulating water low vacuum heating system includes: the system comprises a steam turbine condenser 1, wherein the output end of the steam turbine condenser 1 is connected with a cooling tower 4 through a cooling conveying pipe 2, the input end of the cooling tower 4 is connected with the output end of the steam turbine condenser 1 through the cooling conveying pipe 2, the output end of the cooling tower 4 is connected with the input end of the steam turbine condenser 1 through a cooling return pipe 3, and a cooling tower circulating pump 6 is arranged in the middle of the cooling return pipe 3; a cooling tower isolation valve 5 is arranged in the middle of the cooling delivery pipe 2, and a circulating delivery pipe 8 is connected in the middle of the cooling delivery pipe 2 between the cooling tower isolation valve 5 and the output end of the steam turbine condenser 1; the middle of the circulating conveying pipe 8 is provided with a steam-driven circulating pump 9 and an electric circulating pump 10 in parallel, the middle of the circulating conveying pipe 8 is also provided with a plurality of basic heat exchangers 11 and peak heat exchangers 12 in parallel, and the output ends of the steam-driven circulating pump 9 and the electric circulating pump 10 are connected with the input ends of the basic heat exchangers 11 and the peak heat exchangers 12 through the circulating conveying pipe 8; the output ends of the basic heat exchanger 11 and the peak heat exchanger 12 are connected with a heating water supply pipe 13, and the heating water supply pipe 13 is connected with a heating water return pipe 16 through a heating sheet 15; the heating water return pipe 16 and the cooling return pipe 3 are connected with each other, and the connection point of the heating water return pipe 16 and the cooling return pipe 3 is positioned at the rear side of the output end of the cooling tower circulating pump 6.

Referring to fig. 1 to 2, optionally, the heating system is mainly connected to a turbine of the power generator through a turbine condenser 1 to obtain heat, and the exhaust temperature of the turbine is related to the vacuum degree in the turbine condenser 1, the lower the vacuum degree in the turbine condenser 1, the higher the exhaust temperature of the turbine, and the higher the heat obtained by the turbine condenser 1, the turbine condenser 1 can exchange heat with the exhaust of the turbine, the exhaust heat of the turbine is absorbed by circulating cooling water, and is mainly dissipated through a cooling tower 4, the input end of the cooling tower 4 is connected with the output end of the turbine condenser 1 through a cooling delivery pipe 2, the output end of the cooling tower 4 is connected with the input end of the turbine condenser 1 through a cooling return pipe 3, so that the heated circulating cooling water is delivered to the cooling tower 4 through the cooling delivery pipe 2 for heat dissipation and cooling, then the cooling water flows back to the steam turbine condenser 1 through the cooling return pipe 3 to complete the circulation heat dissipation, when the heat dissipation is carried out through the cooling tower 4, the heat is lost to the atmosphere, meanwhile, a certain amount of circulation cooling water is lost due to the open heat dissipation mode, a heating water inlet valve 14 is arranged between the connection point of the circulation conveying pipe 8 and the cooling return pipe 3 and the input ends of the pneumatic circulating pump 9 and the electric circulating pump 10, the cooling return pipe 3 is mutually connected with the input ends of the pneumatic circulating pump 9 and the electric circulating pump 10 through the circulation conveying pipe 8 and the heating water inlet valve 14, the front side and the rear side of the cooling tower circulating pump 6 are respectively provided with an isolation valve, the input end and the output end of the cooling tower circulating pump 6 are mutually connected with the cooling return pipe 3 through the isolation valves arranged on the front side and the rear side, so that the circulation conveying pipe 8 is connected to the system, and the cooling tower isolation valve 5 is arranged in the middle of the cooling conveying pipe 2, the cold water tower isolation valve 5 is arranged at the connection point of the cooling delivery pipe 2 and the circulating delivery pipe 8 and the input end of the cooling tower 4, so that after the cold water tower isolation valve 5 is closed, the circulating cooling water heated by the heat absorbed by the steam turbine condenser 1 can be directly delivered to the circulating delivery pipe 8 through the cooling delivery pipe 2 and further delivered to the steam-driven circulating pump 9 and the electric circulating pump 10, the steam-driven circulating pump 9 and the electric circulating pump 10 can pressurize the delivered circulating cooling water and further delivered to the basic heat exchanger 11 and the peak heat exchanger 12, the circulating cooling water can be further heated by steam through the basic heat exchanger 11 and the peak heat exchanger 12 to increase the temperature, the temperature of the circulating cooling water can reach the heating requirement, and then the circulating cooling water can be continuously delivered to the heating delivery pipe 13 and delivered to a plurality of heating fins 15 in a residential area through the heating delivery pipe 13, in order to heat the resident, and accomplish the recirculated cooling water that heating temperature reduces and flow back by heating wet return 16, heating wet return 16 with cooling back pipe 3 interconnect, the centre of heating wet return 16 is provided with return water isolating valve 17, heating wet return 16 is through return water isolating valve 17 and cooling back pipe 3 interconnect, recirculated cooling water alright with 16 backward flows to cooling back pipe 3 by heating wet return, and flow back into steam turbine condenser 1 again, in order to carry out the heat exchange heat dissipation to it, thereby the realization has utilized the heat dissipation heat of cooling tower 4, need not to use cooling tower 4 to dispel the heat to the steam turbine, can collect the heat that former cooling tower 4 runs off and utilize, reduce the water waste that calorific loss and moisture evaporation lead to.

Referring to fig. 1 to 2, optionally, the heating system is connected to a heating pipeline in a circulation pipeline of the steam turbine condenser and the cooling tower 4 to meet the dual requirements of heat dissipation and heating through the heating pipeline, and a cyclone dirt separator 25 is disposed in the middle of the heating water return pipe 16, so that the circulating cooling water returned by the heating water return pipe 16 can be treated through the cyclone dirt separator 25, debris can be prevented from flowing backwards through the plurality of heating fins 15 and corresponding pipelines in the residential area, and the reliability and safety of the circulating treatment can be improved.

Referring to fig. 1 to 2, optionally, a circulation connection pipe 18 is connected between a circulation delivery pipe 8 and a heating return pipe 16 of the heating system, a return connection valve 19 is disposed in the middle of the circulation connection pipe 18, a connection point of the circulation connection pipe 18 and the heating return pipe 16 is located at the front side of the return isolation valve 17, a connection point of the circulation connection pipe 18 and the circulation delivery pipe 8 is located between the heating water inlet valve 14 and the input ends of the steam-driven circulation pump 9 and the electric circulation pump 10, the circulation delivery pipe 8 and the heating return pipe 16 can be directly connected through the circulation connection pipe 18, returned circulation cooling water can be directly input into the circulation delivery pipe 8, and heated by a plurality of heat exchangers to form a circulation system, which can independently perform heating circulation work, so as to isolate a heat dissipation system of the heating pipe system and the steam turbine in emergency, and facilitate fault tolerance of the system work, Reliability and safety.

Referring to fig. 1 to 2, optionally, the heating system is provided with a plurality of sensors, a first temperature monitor 20 is arranged in the middle of the cooling return pipe 3, a second temperature monitor 21 is arranged in the middle of the circulating delivery pipe 8, a third temperature monitor 22 is arranged in the middle of the heating supply pipe 13, pressure monitors 23 are arranged at the output ends of the steam-driven circulating pump 9 and the electric circulating pump 10, a pressure relief valve 24 is arranged at the output end of the turbine condenser 1, the temperature of the circulating cooling water delivered to the turbine condenser in a backflow manner, namely the backflow temperature, can be monitored by the first temperature monitor 20, the temperature of the circulating cooling water delivered to the basic heat exchanger 11 and the peak heat exchanger 12 in a backflow manner, namely the output temperature can be monitored by the second temperature monitor 21, the temperature of the circulating cooling water delivered to the basic heat exchanger 11 and the peak heat exchanger 12 in a further steam heating manner can be monitored by the third temperature monitor 22, heating temperature promptly to pressure monitor 23 can monitor the pressure after recirculated cooling water passes through the pressure boost of steam-driven circulating pump 9 and electric circulating pump 10, and each sensor that sets up all can insert PLC automatic control system, with monitoring each item temperature and pressure data, is convenient for carry out real-time regulation control as required, and the during operation is safe and reliable more.

When in use, the pipelines of the heating system are connected firstly, when in work, the vacuum degree in the steam turbine condenser is reduced by adjusting to reduce the vacuum degree to-87 Kpa, the exhaust temperature of the steam turbine is raised to 50-60 ℃, after the steam turbine condenser carries out heat exchange on the exhaust steam, the circulating cooling water output by the cooling conveying pipe 2 reaches 45-50 ℃, and is directly conveyed to the circulating conveying pipe 8 through the cooling conveying pipe 2, and further conveyed to the steam-driven circulating pump 9 and the electric circulating pump 10 through the circulating conveying pipe 8, at ordinary times, the steam-driven circulating pump 9 normally works, the electric circulating pump 10 is used as a standby, the circulating cooling water can be pressurized to 0.45-0.5Mpa through the steam-driven circulating pump 9 and the electric circulating pump 10, and the pressure of the circulating cooling water after being pressurized by the steam-driven circulating pump 9 and the electric circulating pump 10 can be monitored by the pressure monitor 23, when the pressure is between 0.45 and 0.5Mpa, the steam-driven circulating pump 9 normally operates the electric circulating pump 10 for standby and stops operation, and when the pressure is reduced to be lower than 0.3Mpa, the steam-driven circulating pump 9 and the electric circulating pump 10 can be completely started to work to improve the pressure, the circulating cooling water can be continuously conveyed to the basic heat exchanger 11 and the peak heat exchanger 12 after being pressurized, the system is provided with a plurality of basic heat exchangers 11 and a peak heat exchanger 12, the circulating cooling water is further heated and heated through steam when passing through the basic heat exchanger 11 and the peak heat exchanger 12, so that the temperature of the circulating cooling water is raised to 65 to 70 ℃, the temperature of the circulating cooling water after being further heated through the steam of the basic heat exchanger 11 and the peak heat exchanger 12 can be monitored through the third temperature monitor 22, the temperature is set to be a fixed value such as 68 ℃ according to the requirement of the water supply temperature, and the third temperature monitor 22 and the peak heat exchanger 12 are both connected to the system, according to the set value of the water supply temperature, the water supply temperature is ensured to be 68 ℃ by adjusting the steam inlet adjusting valve of the peak heat exchanger 12, automatic adjustment control is realized, the circulating cooling water reaching the temperature is conveyed to a plurality of heating sheets 15 of a residential area through a heating water supply pipe 13 to supply heat for residents, the circulating cooling water after the heating temperature is reduced flows back through a heating water return pipe 16, the circulating cooling water is continuously conveyed back to a cooling return pipe 3 after being processed by a cyclone dirt separator 25 and flows back into the steam turbine condenser 1 again to carry out heat exchange and heat dissipation on the steam turbine condenser, meanwhile, the output end of the steam turbine condenser 1 is provided with a pressure release valve 24, the pressure release valve is automatically opened when the pressure is higher than 0.4MPa, the pressure release is stopped when the pressure is lower than 0.25MPa, so as to ensure the running safety of a unit and complete the circulation of the whole system, and when the first temperature monitor 20 can realize the monitoring of the circulating cooling water back-flow and conveying to the steam turbine condenser, when the reflux temperature is higher than 50 ℃, the cold water tower isolating valve 5 is opened, the cold water tower circulating pump 6 is started, the front and rear isolating valves of the cold water tower circulating pump 6 are opened, the circulating isolating valve 7 and the return water isolating valve 17 are closed, so that circulating cooling water output by the cooling conveying pipe 2 is directly conveyed to the cooling tower 4 through the cold water tower isolating valve 5 for heat dissipation, and is directly conveyed to the return water inlet turbine condenser 1 through the cooling return pipe 3 and the cold water tower circulating pump 6 for heat dissipation, and the return water connecting valve 19 and the circulating water heating inlet are simultaneously opened, so that the heating pipeline independently performs heating circulation work, the heat dissipation systems of the heating pipeline system and the steam turbine are isolated, the circulating water of the steam turbine set is independently operated, and the operation safety of the steam turbine set is ensured.

The circulating water low vacuum heating system provided by the invention is characterized in that a heating pipeline is connected into a circulating pipeline of a turbine condenser and a cooling tower 4, the exhaust temperature of the steam turbine condenser is increased by adjusting and reducing the vacuum degree of the steam turbine condenser, then the temperature of the cooling circulating water is raised through the heat exchange of the steam turbine condenser, the cooling circulating water with the raised temperature can be conveyed to the heat exchanger through the circulating conveying pipe 8, the circulating water is further heated by utilizing steam through the heat exchanger, so as to be conveyed to a heating pipeline for heating by residents, after heat is radiated by a heating radiator for heating, the temperature of circulating water is reduced and flows back to a steam turbine condenser, so as to reduce the exhaust steam temperature of the steam turbine and improve the temperature of circulating water to form a circulating water heating system, the heat that former cooling tower 4 runs off can be collected and utilized, reduce the water waste that calorific loss and moisture evaporation lead to.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to suggest that the scope of one or more embodiments of the present specification (including the claims) is limited to these examples; within the context of one or more embodiments of the present description, features from the above embodiments or from different embodiments may also be combined, steps may be performed in any order, and there are many other variations of the different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.

While one or more embodiments of the present specification have been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present disclosure are intended to be included within the scope of the one or more embodiments of the present disclosure.