Energy-saving optimization system and method for industrial cooling water of thermal power plant

Abstract

This invention proposes an energy-saving optimization system for industrial cooling water in thermal power plants, located between a cooling tower, multiple steam turbine generator sets, and a water storage tank. The system includes at least one industrial water pump, industrial water pipelines, circulating water pipelines, at least one circulating water pump, and at least one throttling pipe. Each industrial water pump draws water from the water storage tank and feeds it into the industrial water pipelines. The industrial water pipelines connect the multiple industrial water pumps and multiple steam turbine generator sets. Each circulating water pump draws water returning to the cooling tower and feeds it into the circulating water pipelines. The throttling pipe connects the industrial water pipelines and the circulating water pipelines. This invention also proposes an energy-saving optimization method for industrial cooling water in thermal power plants. This invention uses a throttling pipe to connect the industrial water pipelines and the circulating water pipelines, thereby enabling the industrial water pipelines and the circulating water pipelines to jointly supply water to each steam turbine generator set, thus maintaining the energy-saving operation of the energy-saving optimization system.

Description

[0001] This application claims the benefit of Chinese patent application No. 202211195230.9, filed on September 28, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of energy-saving technology for cooling water in thermal power plants, and in particular to an energy-saving optimization system and method for industrial cooling water in thermal power plants. Background Technology

[0003] In the power generation process of a thermal power plant, industrial cooling water is typically kept running continuously to maintain the normal operation of the internal turbine generator units, thereby continuously cooling the entire generator set. However, the industrial cooling water system is large, and the turbine generator units within a thermal power plant do not operate simultaneously, and the number of turbine generator units operating simultaneously is frequently adjusted. This makes the operation of the industrial cooling water system uneconomical. A small number of industrial cooling water pumps operating simultaneously cannot meet the cooling water supply pressure of all turbine generator units, while a large number of industrial cooling water pumps operating simultaneously will result in excessively high supply pressure and excessive industrial cooling water flow for each turbine generator unit, thus increasing the power consumption of each industrial cooling water pump. Summary of the Invention

[0004] To address the economic issues associated with the operation of industrial cooling water systems as described in the background art, the present invention proposes the following technical solution:

[0005] An energy-saving optimization system for industrial cooling water in a thermal power plant is installed between a cooling tower, multiple steam turbine generator sets, and a water storage tank. The system includes: at least one industrial water pump, an industrial water pipeline, a circulating water pipeline, at least one circulating water pump, and at least one throttling pipe. Each industrial water pump draws water from the water storage tank and inputs it into the industrial water pipeline. The industrial water pipeline connects the multiple industrial water pumps and multiple steam turbine generator sets. Each circulating water pump draws water returning to the cooling tower and inputs it into the circulating water pipeline. The throttling pipe connects the industrial water pipeline and the circulating water pipeline. When different numbers of steam turbine generator sets are operating simultaneously, the energy-saving operation of the system is maintained by adjusting the conductivity of each throttling pipe.

[0006] Each of the steam turbine generator sets includes auxiliary equipment near the boiler and power generation equipment near the steam turbine; the auxiliary equipment is connected to the industrial water pipeline, and the power generation equipment is connected to the circulating water pipeline.

[0007] Furthermore, the energy-saving optimization system also includes multiple condensers; each condenser is used to condense the high-temperature steam discharged from the power generation equipment and return the generated condensate to the cooling tower.

[0008] Furthermore, each of the aforementioned throttling pipes is equipped with a shut-off valve.

[0009] Furthermore, the industrial water pipeline includes an industrial water main and multiple industrial water branch lines; the industrial water main connects the multiple industrial water pumps and each of the industrial water branch lines; each of the industrial water branch lines is connected to one of the steam turbine generator sets.

[0010] Furthermore, the circulating water pipeline includes multiple output pipes and multiple return pipes; each output pipe is connected to the circulating water pump and one of the steam turbine generator sets; each return pipe is connected to one of the steam turbine generator sets and the cooling tower.

[0011] Furthermore, each of the aforementioned throttling pipes is located between one of the aforementioned industrial water branch pipes and one of the aforementioned output pipes.

[0012] Furthermore, each of the auxiliary equipment within the steam turbine generator set is equipped with a main water inlet valve for controlling the flow of the output pipeline.

[0013] Furthermore, each of the aforementioned output pipes is equipped with a circulating cooling water booster pump.

[0014] Another objective of this invention is to propose an energy-saving optimization method for industrial cooling water in thermal power plants. The energy-saving optimization method utilizes the aforementioned energy-saving optimization system for industrial cooling water in thermal power plants. The energy-saving optimization method includes: when there is a surplus in the water supply of the industrial water pipeline, adjusting each of the industrial water pumps and opening the corresponding throttling pipes until the water supply of the industrial water pipeline matches the demand of the simultaneously operating steam turbine generator set.

[0015] Beneficial effects: This invention connects industrial water pipelines and circulating water pipelines through a throttling pipe, thereby enabling the industrial water pipelines and circulating water pipelines to jointly supply water to each steam turbine generator set, thus maintaining the energy-saving operation of the energy-saving optimization system. Attached Figure Description

[0016] Figure 1 A schematic diagram of an energy-saving optimization system for industrial cooling water in a thermal power plant, provided according to an embodiment of the present invention;

[0017] Figure 2 This is a partial structural schematic diagram of an energy-saving optimization system for industrial cooling water in a thermal power plant, provided according to an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0019] It should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0020] Figure 1 This is a schematic diagram of the structure of an energy-saving optimization system for industrial cooling water in a thermal power plant, provided by an embodiment of the present invention.

[0021] Reference Figure 1 An energy-saving optimization system for industrial cooling water in a thermal power plant, according to an embodiment of the present invention, includes: at least one industrial water pump 4, an industrial water pipeline 5, a circulating water pipeline 6, at least one circulating water pump 7, and at least one throttling pipe 8. The entire energy-saving optimization system is located between multiple steam turbine generator sets 2 and a cooling tower 1. Each industrial water pump 4 is located between the industrial water pipeline 5 and a water storage tank 3. The industrial water pipeline 5 pumps water from the water storage tank 3 and delivers it to each operating steam turbine generator set 2 via the industrial water pump 4. Each circulating water pump 7 is connected to the cooling tower 1. The circulating water pipeline 6 draws water returning to the cooling tower 1 via the circulating water pump 7 and inputs it into each operating steam turbine generator set 2. Each throttling pipe 8 is located between the industrial water pipeline 5 and the circulating water pipeline 6, and the industrial water pipeline 5 and the circulating water pipeline 6 are connected via the throttling pipe 8.

[0022] By reducing the number of turbine generator sets 2 operating simultaneously, the water supply to each turbine generator set 2 from the industrial water pipeline 5 and the circulating water pipeline 6 can be flexibly adjusted by regulating the conductivity of each throttling pipeline 8, thus maintaining the energy-saving operation of the entire energy-saving optimization system.

[0023] Specifically, the industrial water pipeline 5 includes an industrial water main 51 and multiple industrial water branch 52; the circulating water pipeline 6 includes multiple output pipes 61 and multiple return pipes 62. The industrial water main 51 connects multiple industrial water pumps 4, and each industrial water main 51 is connected to each steam turbine generator set 2 via an industrial water branch 52. Each output pipe 61 is located between a circulating water pump 7 and a steam turbine generator set 2, and each return pipe 62 is located between a cooling tower 1 and a steam turbine generator set 2. Each throttling pipe 8 is located between an industrial water branch 52 and a corresponding output pipe 61, and each throttling pipe 8 is equipped with a shut-off valve 81 for controlling the flow of that throttling pipe 8.

[0024] During the operation of each steam turbine generator set 2, the connection degree of the corresponding industrial water branch 52 and output pipe 61 can be controlled by the shut-off valve 81, so that the industrial water pipeline 5 and the circulating water pipeline 6 can jointly supply water to the steam turbine generator set 2. Thus, the number of industrial water pumps 4 operating at the same time can be reduced while meeting the requirement of the same number of steam turbine generator sets 2 operating at the same time.

[0025] The circulating water in the circulating water pipeline 6 is the cooling water used for cooling the condenser and generator hydrogen cooler in the turbine generator set 2, while the industrial water in the industrial water pipeline 5 is the cooling water used for cooling the auxiliary equipment 21 in the turbine generator set 2. After being cooled by its corresponding cooler, the industrial water is used as supplementary water for the circulating water. This invention utilizes a throttling pipe 8 to connect the industrial water pipeline 5 and the circulating water pipeline 6, using circulating water to supplement the industrial water supply. This reduces the number of industrial water pumps 4 operating simultaneously and reduces the supply pressure of the industrial water pumps 4, maintaining a balance between industrial water and circulating water supplementation, thereby achieving the effect of saving the total power consumption of the industrial water pumps 4.

[0026] Figure 2 This is a partial structural schematic diagram of an energy-saving optimization system for industrial cooling water in a thermal power plant, provided according to an embodiment of the present invention.

[0027] Refer to together Figure 1 and Figure 2 Specifically, the steam turbine generator set 2 includes auxiliary equipment 21 near the boiler and power generation equipment 22 near the steam turbine. Each auxiliary equipment 21 is connected to an industrial water branch channel 52, and each power generation equipment 22 is connected to an output pipe 61. The industrial water flowing out of each auxiliary equipment 21 and each power generation equipment 22 flows into the cooling tower 1 through a return pipe 62. In this embodiment, each auxiliary equipment 21 is equipped with a main inlet valve 211 that controls the connection of the corresponding output pipe 61.

[0028] When each turbine generator set 2 is operating, the water supply to the auxiliary equipment 21 can be reduced by closing the main water inlet valve 211. When the main water inlet valve 211 is closed and the shut-off valve 81 is open, the industrial water pipeline 5 and the circulating water pipeline 6 jointly supply power to the power generation equipment 22 of the turbine generator set 2, thereby meeting the water supply needs of more turbine generator sets 2 without the need to turn on an additional industrial water pump 4.

[0029] Preferably, each output pipe 61 is also equipped with a circulating cooling water booster pump 611. During the operation of the steam turbine generator set 2, the water supply of each output pipe 61 can be increased by each circulating water booster pump. When the main water inlet valve 211 is closed and the shut-off valve 81 is open, the water supply of the industrial water pipeline 5 can be further increased by adjusting each circulating cooling water booster pump 611.

[0030] In this embodiment, the energy-saving optimization system also includes multiple condensers 9. Each condenser 9 is connected to the cooling tower 1 and the power generation equipment 22 in the turbine generator set 2. The high-temperature steam discharged from each power generation equipment 22 is condensed into water through each corresponding condenser 9 and flows back to the input cooling tower 1.

[0031] Another objective of this invention is to propose an energy-saving optimization method for industrial cooling water in thermal power plants. The energy-saving optimization method includes: when there is a surplus in the water supply of the industrial water pipeline 5, adjusting the industrial water pump 4 and opening the corresponding throttling pipe 8 until the water supply of the industrial water pipeline 5 matches the demand of the steam turbine generator set 2 operating simultaneously.

[0032] The following section uses an energy-saving optimization system comprising four steam turbine generator sets 2 and four industrial water pumps 4 as an example to describe the energy-saving optimization method step by step:

[0033] Specifically, when only one steam turbine generator set 2 is running, only one industrial water pump 4 is kept running, the main water inlet valve 211 of the auxiliary equipment 21 in the other non-running steam turbine generator set 2 is closed, and the shut-off valve 81 between the industrial water branch 52 and the output pipe 61 is opened, so that the industrial water pipeline 5 and the circulating water pipeline 6 simultaneously supply water to the power generation equipment 21 in the running steam turbine generator set 2.

[0034] When four steam turbine generator sets 2 are running simultaneously, four industrial water pumps 4 are typically required to operate simultaneously to meet the water supply needs of all steam turbine generator sets 2. If the auxiliary equipment 21 within each steam turbine generator set 2 does not need to operate simultaneously, one industrial water pump 4 is shut off, the main water inlet valve 211 of the auxiliary equipment 21 that does not need to operate is closed, and the circulating cooling water booster pump 611 on each output pipe 61 is adjusted to meet the water supply needs of all steam turbine generator sets 2.

[0035] When only three steam turbine generator sets 2 are running simultaneously, one industrial water pump 4 is shut down while three industrial water pumps 4 are running simultaneously. The main water inlet valve 211 of the auxiliary equipment 21 that is not running in the steam turbine generator set 2 is closed. The circulating cooling water booster pump 611 on each output pipe 61 is adjusted and the shut-off valve 81 between the corresponding industrial water branch 52 and the output pipe 61 is opened to meet the water supply needs of all three operating steam turbine generator sets 2.

[0036] When only two turbine generator sets 2 are running simultaneously, optimization is usually not required. However, as the number of non-operating turbine generator sets 2 increases, some auxiliary equipment 21 of these non-operating units may need to start using industrial water, and the pressure of one industrial water pump 4 may not meet the requirements. If industrial water pump 4 malfunctions and cannot operate, the corresponding shut-off valve 81 can be opened to supply circulating water from the circulating water pipeline 6 to the industrial water pipeline 5; conversely, if the circulating cooling water booster pump 611 malfunctions and cannot operate, the shut-off valve 81 can be opened to supply industrial water from the industrial water pipeline 5 to the circulating water pipeline.

[0037] When only one turbine generator set 2 is running, due to the large size of the plant's industrial water system and the large number of turbine generator sets 2 that are not running, some of their auxiliary equipment 21 may need to be operated. Depending on the industrial water pressure, if the industrial cooling water pressure meets the requirements, no optimization is needed. If the industrial cooling water pressure does not meet the requirements, the corresponding shut-off valve 81 needs to be opened to increase the industrial water pressure for optimization.

[0038] In summary, this invention connects the industrial water pipeline and the circulating water pipeline through a throttling pipe, thereby enabling the industrial water pipeline and the circulating water pipeline to jointly supply water to each steam turbine generator set, thus maintaining the energy-saving operation of the energy-optimized system. Furthermore, each output pipeline is equipped with a circulating cooling water booster pump, which can further increase the amount of water flowing into the industrial water branch from the output pipeline when the shut-off valve is closed.

[0039] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims.

[0040] The terms “exemplary,” “example,” etc., used throughout this specification mean “serving as an example, instance, or illustration” and do not imply “preferred” or “advantageous” than other embodiments. Detailed descriptions are included for the purpose of providing an understanding of the described techniques. However, these techniques can be practiced without these detailed descriptions. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0041] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0042] The foregoing description of this specification is provided to enable any person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of protection of this specification. Therefore, this specification is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. An energy saving optimization system for industrial cooling water of a thermal power plant, which is provided between a cooling tower (1), a plurality of steam turbine generator units (2) and a reservoir (3), characterized in that, The energy-saving optimization system comprises at least one industrial water pump (4), an industrial water pipeline (5), a circulating water pipeline (6), at least one circulating water pump (7) and at least one throttling pipeline (8); each of the industrial water pumps (4) is used to extract water in the water storage pool (3) and input into the industrial water pipeline (5); the industrial water pipeline (5) is used to connect a plurality of the industrial water pumps (4) and a plurality of steam turbine generator units (2); each of the circulating water pumps (7) is used to extract water flowing back into the cooling tower (1) and input into the circulating water pipeline (6); the throttling pipeline (8) is used to connect the industrial water pipeline (5) and the circulating water pipeline (6); under the condition that different numbers of the steam turbine generator units (2) are running at the same time, the energy-saving operation of the energy-saving optimization system is maintained by adjusting the conduction degree of each of the throttling pipelines (8).

2. The energy saving optimization system for industrial cooling water of a thermal power plant as claimed in claim 1, wherein, Each of the steam turbine generator units (2) comprises auxiliary equipment (21) near a boiler and power generation equipment (22) near a steam turbine; the auxiliary equipment (21) is connected with the industrial water pipeline (5), and the power generation equipment (22) is connected with the circulating water pipeline (6).

3. The energy saving optimization system for industrial cooling water of a thermal power plant according to claim 2, characterized in that, The energy-saving optimization system further comprises a plurality of condensers (9); each of the condensers (9) is used to condense high-temperature steam discharged by the power generation equipment (22) and return the generated condensed water into the cooling tower (1).

4. The energy saving optimization system for industrial cooling water of a thermal power plant according to claim 3, characterized in that, Each of the throttling pipelines (8) is provided with a stop valve (81).

5. The energy saving optimization system for industrial cooling water of a thermal power plant as claimed in claim 3 wherein, The industrial water pipeline (5) comprises an industrial water trunk (51) and a plurality of industrial water branches (52); the industrial water trunk (51) connects the plurality of the industrial water pumps (4) and each of the industrial water branches (52); each of the industrial water branches (52) is connected with one of the steam turbine generator units (2).

6. The energy saving optimization system for industrial cooling water of a thermal power plant as claimed in claim 5 wherein, The circulating water pipeline (6) comprises a plurality of output pipelines (61) and a plurality of return pipelines (62); each of the output pipelines (61) connects the circulating water pump (7) and one of the steam turbine generator units (2); each of the return pipelines (62) connects one of the steam turbine generator units (2) and the cooling tower (1).

7. The energy saving optimization system for industrial cooling water of a thermal power plant as claimed in claim 6 wherein, Each of the throttling pipelines (8) is arranged between one of the industrial water branches (52) and one of the output pipelines (61).

8. The energy saving optimization system for industrial cooling water of a thermal power plant according to claim 7, characterized in that, Each of the auxiliary equipment (21) in each of the steam turbine generator units (2) is provided with a water inlet master valve (211) used to control the conduction of the output pipeline (61).

9. The energy saving optimization system for industrial cooling water of a thermal power plant according to claim 8, characterized in that, Each of the output pipelines (61) is provided with a circulating cooling water booster pump (611).

10. An energy saving optimization method using the energy saving optimization system for industrial cooling water of a thermal power plant according to any one of claims 1 to 9, characterized by, The energy-saving optimization method comprises: when the water supply of the industrial water pipeline (5) is surplus, adjusting each of the industrial water pumps (4) and conducting the corresponding throttling pipeline (8) until the water supply of the industrial water pipeline (5) matches the demand of the steam turbine generator units (2) running at the same time.

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