Industrial circulating water residual pressure power generation energy-saving system

Abstract

The utility model discloses an industrial circulating water residual pressure power generation energy-saving system, which comprises an industrial circulating water subsystem, a residual pressure power generation subsystem and a residual pressure power generation control subsystem, the residual pressure power generation performance is monitored through the residual pressure power generation control subsystem, the pressure, the flow and the valve opening degree in the system operation process are regulated and controlled in real time, and the integral energy-saving overall planning of the system is considered.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation and energy saving, in particular to an industrial circulating water residual pressure power generation and energy saving system. Background Art

[0002] Industrial circulating water systems typically use pumps to deliver cooled circulating water to various heat exchangers. After heat exchange with the heat exchangers, the high-temperature circulating water returns to the cooling tower through a return pipe for cooling. The cooled water then returns to the cooling pool, forming a complete water loop. During the water circulation process, the height difference between the cooling tower, cooling pool, and other equipment can cause significant residual return pressure in the circulating water system. Recovering this residual pressure for power generation can effectively reduce energy waste and achieve energy conservation and emission reductions.

[0003] Existing circulating water excess pressure power generation systems consist of a water circulation device and a power generation device. Driven by a hydraulic turbine or other power machinery, they convert the excess kinetic energy of the circulating water pump's discharge into mechanical energy, which is then used to generate electricity using a generator. This allows for energy recovery from the pressure differential generated during the cooling process of the heat exchanger. Drawbacks of existing circulating water excess pressure power generation systems include the use of a single control and regulation method for either the water circulation device or the power generation device, lacking comprehensive control over the heat exchange and power generation performance of the circulating water excess pressure power generation system. Furthermore, these systems fail to effectively address the issue of low power generation performance caused by fluctuations in water flow within the circulating water system's pipelines. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one object of the present invention is to provide an industrial circulating water excess pressure power generation energy-saving system that can comprehensively adjust the performance of the industrial circulating water excess pressure power generation energy-saving system.

[0005] The technical solution adopted in this utility model is:

[0006] In the first aspect, the utility model provides a residual pressure power generation energy-saving system, comprising: an industrial circulating water subsystem, comprising a cooling tower, a water supply pump and a heat exchanger, the water outlet of the cooling tower is connected to the inlet of the water supply pump through a water supply pipeline, and the outlet of the water supply pump is connected to the water inlet of the heat exchanger; a residual pressure power generation subsystem, comprising a hydro-generator, a power generation cabinet, and a power distribution cabinet on the power consumption side, the water outlet of the heat exchanger is connected to the inlet of the hydro-generator, the outlet of the hydro-generator is connected to the return water port of the cooling tower, and the AC power generated by the hydro-generator is connected to the generator cabinet. The cabinet is directly incorporated into the busbar of the power distribution cabinet on the power consumption side; the residual pressure power generation control subsystem is connected to the power generation cabinet and is used to monitor the residual pressure power generation performance; wherein, multiple pressure gauges, multiple flow meters and multiple electric regulating valves are respectively provided on the pipelines of the industrial circulating water subsystem and the residual pressure power generation subsystem, and the residual pressure power generation control subsystem is also respectively connected to the multiple pressure gauges, the multiple flow meters and the multiple electric regulating valves, and is used to automatically adjust the valve openings of the multiple electric regulating valves according to the pressures measured by the multiple pressure gauges and the flows measured by the multiple flow meters.

[0007] Wherein, a first regulating valve, a first flow meter and a second regulating valve are arranged in series between the outlet of the water supply pump and the water inlet of the heat exchanger.

[0008] Wherein, a third regulating valve, a second flow meter and a first electric regulating valve are arranged in series between the water outlet of the heat exchanger and the inlet of the hydro-generator.

[0009] A bypass is also provided between the return water port of the cooling tower and the water outlet of the heat exchanger, and the bypass is connected in parallel with the hydro-generator branch. A second electric regulating valve is provided on the bypass, and one end of the second electric regulating valve is connected to the third regulating valve, and the other end is connected to the return water port of the cooling tower.

[0010] Among them, when the water supply pump is running, the residual pressure generating subsystem runs synchronously, and the hydraulic balance of the industrial circulating water subsystem during operation is debugged by adjusting the valve opening to ensure that the power of the water supply pump is not overloaded. When the system is running, the first regulating valve, the second regulating valve and the third regulating valve are fully opened to transfer the local resistance to the hydro-generator, thereby improving the efficiency of water energy utilization.

[0011] Among them, the outlet of the heat exchanger is provided with a first pressure gauge, the inlet of the hydro-generator is provided with a second pressure gauge, and the outlet of the hydro-generator is provided with a third pressure gauge. The residual pressure power generation control subsystem is also connected to the first pressure gauge, the second pressure gauge, and the third pressure gauge respectively, for monitoring the outlet pressure of the heat exchanger and the pressure difference of the hydro-generator.

[0012] Among them, the residual pressure power generation control subsystem is also connected to the water supply pump through a frequency converter, and is used to adjust the flow rate of the water supply pump by adjusting the frequency of the frequency converter.

[0013] Among them, an intelligent electricity meter is arranged between the water turbine generator and the power generation cabinet, and the residual pressure power generation control subsystem is also connected to the intelligent electricity meter for monitoring the residual pressure power generation performance.

[0014] Among them, when the system is running, when the pressure measured by the first pressure gauge is less than 10 KPa, the residual pressure power generation control subsystem controls the first electric control valve to close the valve; when the pressure measured by the first pressure gauge is greater than or equal to 10 KPa, the residual pressure power generation control subsystem controls the first electric control valve to fully open the valve.

[0015] Among them, when the system is running, the total pipe flow rate Q1 is monitored by the first flow meter, and the minimum flow rate Qmin for ensuring the normal operation of the system is set according to the logic. The sizes of Q1 and Qmin are judged, and the valve opening and the water pump frequency are adjusted: when Q1 < Qmin, the residual pressure power generation control subsystem fully opens the valve of the first electric control valve; when Qe1 is still less than Qmin after the valve of the first electric control valve is fully opened, the residual pressure power generation control subsystem fully opens the valve of the second electric control valve; when Q1 is still less than Qmin after the valve of the second electric control valve is fully opened, the residual pressure power generation control subsystem increases the frequency of the water supply pump to make the total pipe flow rate Q1 greater than the minimum flow rate Qmin for system operation, so as to ensure the stable and energy-saving operation of the system.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The present utility model includes an industrial circulating water subsystem, a residual pressure power generation subsystem and a residual pressure power generation control subsystem. The residual pressure power generation performance is monitored through the residual pressure power generation control subsystem, and the pressure, flow rate and valve opening in the system operation process are regulated in real time, taking into account the overall energy-saving overall planning of the system.

[0018] Furthermore, the present utility model realizes the highest pressure protection at the end of the pipeline side through pressure linkage regulation, improving the safety of the system.

[0019] In addition, the present utility model realizes the minimum flow rate protection of the system by monitoring the total pipe flow rate, ensuring the stable and energy-saving operation of the industrial circulating water residual pressure power generation system.

[0020] In addition, the present utility model transfers the local resistance to the generator for power generation as much as possible through valve debugging, improving the water energy utilization efficiency. Description of the Drawings

[0021] Figure 1It is a structural diagram of an embodiment of the industrial circulating water residual pressure power generation energy-saving system of the present utility model. DETAILED DESCRIPTION

[0022] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0023] See also Figure 1 , Figure 1 This is a structural diagram of an embodiment of the utility model industrial circulating water residual pressure power generation energy saving system. Figure 1 As shown, the industrial circulating water excess pressure power generation energy-saving system includes an industrial circulating water subsystem (not labeled in the figure), an excess pressure power generation subsystem (not labeled in the figure) and an excess pressure power generation control subsystem 30.

[0024] The industrial circulating water subsystem includes a cooling tower 11, a water supply pump 12 and a heat exchanger 13. The water outlet of the cooling tower 11 is connected to the inlet of the water supply pump 12 through a water supply pipeline, and the outlet of the water supply pump 12 is connected to the water inlet of the heat exchanger 13 through a water supply pipeline.

[0025] The excess pressure generating subsystem includes a hydro-generator 21, a power generating cabinet 22, and a power distribution cabinet 23 on the power consumption side. The water outlet of the heat exchanger 13 is connected to the inlet of the hydro-generator 21, and the outlet of the hydro-generator 21 is connected to the return water outlet of the cooling tower 11. The AC power generated by the hydro-generator 21 passes through the power generating cabinet 22 and is directly incorporated into the busbar of the power distribution cabinet 23 on the power consumption side.

[0026] The residual pressure power generation control subsystem 30 is connected to the power generation cabinet 22 and is used to monitor the residual pressure power generation performance.

[0027] Among them, multiple pressure gauges, multiple flow meters and multiple electric regulating valves are respectively installed on the pipelines of the industrial circulating water subsystem and the residual pressure power generation subsystem. The residual pressure power generation control subsystem 30 is also respectively connected to the multiple pressure gauges, the multiple flow meters and the multiple electric regulating valves, and is used to automatically adjust the valve opening of the multiple electric regulating valves according to the pressure measured by the multiple pressure gauges and the flow measured by the multiple flow meters.

[0028] A first regulating valve 14, a first flowmeter 15, and a second regulating valve 16 are connected in series between the outlet of the water supply pump 12 and the water inlet of the heat exchanger 13. Specifically, the inlet of the first regulating valve 14 is connected to the outlet of the water supply pump 12, the outlet of the first regulating valve 14 is connected to the inlet of the first flowmeter 15, the outlet of the first flowmeter 15 is connected to the inlet of the second regulating valve 16, and the outlet of the second regulating valve 16 is connected to the water inlet of the heat exchanger 13. The first flowmeter 15 is connected to the residual pressure power generation control subsystem 30 to automatically monitor the flow rate of the main pipe.

[0029] A third regulating valve 17, a second flowmeter 24, and a first electric regulating valve 25 are installed in series between the water outlet of the heat exchanger 13 and the inlet of the hydro-generator 21. The inlet of the third regulating valve 17 is connected to the water outlet of the heat exchanger 13, and the outlet of the third regulating valve 17 is connected to the inlet of the second flowmeter 24. The outlet of the second flowmeter 24 is connected to the inlet of the first electric regulating valve 25, and the outlet of the first electric regulating valve 25 is connected to the inlet of the hydro-generator 21. The second flowmeter 24 is connected to the residual pressure power generation control subsystem 30 and is used to automatically monitor the water flow entering the hydro-generator 21. The first regulating valve 14, the second regulating valve 15, and the third regulating valve 17 are used to manually adjust the hydraulic loss during operation of the industrial circulating water subsystem.

[0030] Preferably, a bypass is provided between the return water port of the cooling tower 11 and the water outlet of the heat exchanger 13, and the bypass is connected in parallel with the branch of the hydro-generator 21. A second electric regulating valve 26 is provided on the bypass, and one end of the second electric regulating valve 26 is connected to the third regulating valve 17, and the other end is connected to the return water port of the cooling tower 11.

[0031] The outlet of the heat exchanger 13 is provided with a first pressure gauge 18, the inlet of the hydro-generator 21 is provided with a second pressure gauge 27, and the outlet of the hydro-generator 21 is provided with a third pressure gauge 28. The residual pressure power generation control subsystem 30 is also connected to the first pressure gauge 18, the second pressure gauge 27, and the third pressure gauge 28 respectively, for monitoring the outlet pressure of the heat exchanger 13 and the pressure difference of the hydro-generator 21.

[0032] Optionally, the excess pressure power generation control subsystem 30 is connected to the water supply pump 12 via a frequency converter 19 , and is configured to adjust the flow rate of the water supply pump 12 by adjusting the frequency of the frequency converter 19 .

[0033] A smart meter 29 is provided between the hydro-generator 21 and the power generation cabinet 22 . The residual pressure power generation control subsystem 30 is also connected to the smart meter 29 for monitoring the residual pressure power generation performance.

[0034] The present invention's industrial circulating water residual pressure power generation and energy-saving system operates as follows: when the water supply pump 12 is operating, the residual pressure power generation subsystem operates synchronously. The hydraulic balance of the industrial circulating water subsystem is adjusted by adjusting the valve opening to ensure that the power of the water supply pump 12 is not overloaded. When the system is operating, the first regulating valve 14, the second regulating valve 16, and the third regulating valve 17 are fully opened to transfer local resistance to the hydro-generator 21, thereby improving water energy utilization efficiency.

[0035] During system operation, the circulating water from heat exchanger 13 enters hydro-generator 21 to generate electricity, recycling excess pressure and reducing energy waste. The power generation efficiency η is calculated based on the pressure values P2 and P3 measured by second and third pressure gauges 27 and 28, and the generated power W measured by electric meter 321.

[0036] The calculation formula for power generation efficiency η is: Wherein, η is the power generation efficiency, W is the power generation power measured by the smart meter 29, P2 is the pressure measured by the second pressure gauge 27, P3 is the pressure measured by the third pressure gauge 28, and Q2 is the flow rate measured by the second flow meter 24.

[0037] The working method of regulating pressure of the utility model industrial circulating water residual pressure power generation energy-saving system is:

[0038] (1) Monitor the pressure P1 at the outlet of the heat exchanger 13 through the first pressure gauge 18;

[0039] (2) When the pressure P1 measured by the first pressure gauge 18 is less than 10 kPa, the residual pressure power generation control subsystem 30 controls the first electric regulating valve 25 to close the valve to ensure the positive pressure of the system and avoid safety problems caused by pipeline interruption and air precipitation.

[0040] (3) When the pressure P1 measured by the first pressure gauge is greater than or equal to 10 kPa, the residual pressure power generation control subsystem 30 controls the first electric regulating valve 25 to fully open the valve so that the hydraulic power can be fully used for power generation.

[0041] The working method of regulating flow in the utility model industrial circulating water residual pressure power generation energy-saving system is:

[0042] (1) Monitoring the main pipe flow Q1 through the first flow meter 15;

[0043] (2) According to the logic setting, the minimum flow rate to ensure the normal operation of the system is Q min ;

[0044] (3) Determine Q1 and Q min The size of the valve opening and the pump frequency are adjusted: when Q1 min When Q1 is still less than Q2, the residual pressure power generation control subsystem 30 opens the valve of the first electric regulating valve 25 completely. min When the residual pressure power generation control subsystem 30 fully opens the valve of the second electric regulating valve 26; when the valve of the second electric regulating valve 26 is fully opened, if Q1 is still less than Q min When the residual pressure power generation control subsystem 30 increases the frequency of the water supply pump 12, the main flow Q1 is greater than the minimum flow Q min , ensuring smooth and energy-saving operation of the system.​

[0045] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An industrial circulating water excess pressure power generation energy-saving system, characterized in that: include: The industrial circulating water subsystem includes a cooling tower, a water supply pump, and a heat exchanger. The water outlet of the cooling tower is connected to the inlet of the water supply pump through a water supply pipeline, and the outlet of the water supply pump is connected to the water inlet of the heat exchanger. The excess pressure generating subsystem includes a hydro-generator, a power generation cabinet, and a power distribution cabinet on the power consumption side. The water outlet of the heat exchanger is connected to the inlet of the hydro-generator, and the outlet of the hydro-generator is connected to the return water outlet of the cooling tower. The AC power generated by the hydro-generator is directly integrated into the busbar of the power distribution cabinet on the power consumption side through the power generation cabinet. A residual pressure power generation control subsystem, connected to the power generation cabinet, for monitoring the residual pressure power generation performance; Among them, multiple pressure gauges, multiple flow meters and multiple electric regulating valves are respectively provided on the pipelines of the industrial circulating water subsystem and the residual pressure power generation subsystem. The residual pressure power generation control subsystem is also respectively connected to the multiple pressure gauges, the multiple flow meters and the multiple electric regulating valves, and is used to automatically adjust the valve openings of the multiple electric regulating valves according to the pressure measured by the multiple pressure gauges and the flow measured by the multiple flow meters.

2. The power generation and energy-saving system according to claim 1, characterized in that: A first regulating valve, a first flow meter and a second regulating valve are arranged in series between the outlet of the water supply pump and the water inlet of the heat exchanger.

3. The power generation and energy-saving system according to claim 2, characterized in that: A third regulating valve, a second flow meter and a first electric regulating valve are arranged in series between the water outlet of the heat exchanger and the inlet of the hydro-generator.

4. The power generation and energy-saving system according to claim 3, characterized in that: A bypass is also provided between the return water port of the cooling tower and the water outlet of the heat exchanger, and the bypass is connected in parallel with the hydro-generator branch. A second electric regulating valve is provided on the bypass, and one end of the second electric regulating valve is connected to the third regulating valve, and the other end is connected to the return water port of the cooling tower.

5. The power generation and energy-saving system according to claim 3, characterized in that: When the water supply pump is running, the residual pressure generating subsystem is operated synchronously, and the hydraulic balance of the industrial circulating water subsystem during operation is debugged by adjusting the valve opening to ensure that the power of the water supply pump is not overloaded. When the system is running, the first regulating valve, the second regulating valve and the third regulating valve are fully opened to transfer local resistance to the hydro-generator, thereby improving the efficiency of water energy utilization.

6. The power generation and energy-saving system according to claim 4, characterized in that: The outlet of the heat exchanger is provided with a first pressure gauge, the inlet of the hydro-generator is provided with a second pressure gauge, and the outlet of the hydro-generator is provided with a third pressure gauge. The residual pressure power generation control subsystem is also connected to the first pressure gauge, the second pressure gauge, and the third pressure gauge, respectively, for monitoring the outlet pressure of the heat exchanger and the pressure difference of the hydro-generator.

7. The power generation and energy-saving system according to claim 1, characterized in that: The excess pressure power generation control subsystem is also connected to the water supply pump via a frequency converter, and is used to adjust the flow rate of the water supply pump by adjusting the frequency of the frequency converter.

8. The power generation and energy-saving system according to claim 1, characterized in that: A smart meter is provided between the hydro-generator and the power generation cabinet, and the residual pressure power generation control subsystem is also connected to the smart meter for monitoring the residual pressure power generation performance.

9. The power generation and energy-saving system according to claim 6, characterized in that: When the system is running, when the pressure measured by the first pressure gauge is less than 10KPa, the residual pressure power generation control subsystem controls the first electric regulating valve to close the valve; when the pressure measured by the first pressure gauge is greater than or equal to 10KPa, the residual pressure power generation control subsystem controls the first electric regulating valve to fully open the valve.

10. The power generation and energy-saving system according to claim 4, characterized in that: When the system is running, the main flow rate monitored by the first flow meter is Q1, and the minimum flow rate to ensure the normal operation of the system is Q according to the logic setting. min , judge Q1 and Q min The size of the valve opening and the pump frequency are adjusted: when Q1 min When the residual pressure power generation control subsystem fully opens the valve of the first electric regulating valve; when the valve of the first electric regulating valve is fully opened, if Q1 is still less than Q min When the residual pressure power generation control subsystem fully opens the valve of the second electric regulating valve; when the valve of the second electric regulating valve is fully opened, if Q1 is still less than Q min When the residual pressure power generation control subsystem increases the frequency of the water supply pump, the main pipe flow Q1 is greater than the minimum flow Q of the system operation. min , thus ensuring the smooth and energy-saving operation of the system.​

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