System and method for controlling power-saving operation of condensation water system

Abstract

The invention relates to a system for controlling the power-saving operation of a condensation water system, which comprises a condenser, at least two condensation pumps, a power frequency conversion control unit, a condensation water main pipeline, a deaerator and a distributed control system (DCS), outlets of the condensate pumps are connected with an inlet of the condensate water main pipeline in parallel through the variable-speed main pipeline, an outlet of the condensate water main pipeline is connected with an inlet of the deaerator, and the variable-speed main pipeline is provided with a check valve, a power frequency branch pipeline and a condensate pump variable-frequency adjusting control valve set in the fluid flowing direction. An outlet of each power frequency branch pipeline is connected with an inlet of the condensation water main pipeline through a power frequency main pipeline, a first condensation pump power frequency adjusting control valve group is arranged on each power frequency branch pipeline, and a second condensation pump power frequency adjusting control valve group is arranged on the power frequency main pipeline. The influence of the regulating valve group in the system can be effectively removed, so that the system is more energy-saving, undisturbed switching of power frequency and frequency conversion of the condensate pump is realized, and the safety of the system and the stability of the water level of the deaerator are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of thermal systems, and in particular to a system for controlling power-saving operation of a condensate water system. Background Art

[0002] The deaerator is responsible for deoxidation in the thermal system. It is also a hybrid heater in the heat recovery system and serves as a buffer and water storage device between the condensate pump and the feed pump. It is important to keep the water level of the deaerator stable.

[0003] At present, there are at least tens of thousands of condensation and deoxidation equipment for industrial steam turbines and condensation and deoxidation equipment for power station steam turbines in my country.

[0004] In recent years, the technology of high-power frequency converters has become more and more mature and reliable, while the price of frequency converters is relatively high. In order to save power and reduce investment, most of these condensation deaerator systems have installed (infrastructure) or modified frequency converter control devices, while retaining the regulating valve device in the power frequency controlled condensation deaerator system to meet the water level regulation of the deaerator and the water demand of equipment outside the condensate system.

[0005] The current condensation deoxygenation system is a variable frequency and industrial frequency throttling operation mode. After the installation of the frequency conversion device, a large amount of factory electricity is saved, but there is still great potential for electricity saving and room for reducing equipment investment (new construction).

[0006] In the current condensate water variable frequency regulation system pipeline valve design, the regulating valve is connected in series with the system equipment in the variable speed regulation system. Affected by the fully open valve resistance ratio (pressure drop ratio), the system is not energy-saving and the variable frequency energy-saving effect cannot be fully reflected.

[0007] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies in the prior art and to provide a system for power-saving operation control of a condensate water system. The regulating valve of the present invention is connected in parallel with the condensate pump variable frequency regulating control valve group, which can effectively eliminate the influence of the regulating valve group in the system, make the system more energy-efficient, realize the disturbance-free switching of the condensate pump variable frequency, and ensure the safety of the system and the stability of the deaerator water level.

[0009] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a system for power-saving operation control of a condensate system, comprising a condenser, a condensate pump, an industrial frequency conversion control unit, a condensate main line, a deaerator and a DCS control system, at least two condensate pumps are provided, the outlet of the condenser is connected in parallel with the inlet of each condensate pump, the outlet of each condensate pump is connected in parallel with the inlet of the condensate main line through a variable speed main line, the outlet of the condensate main line is connected with the inlet of the deaerator, a check valve, an industrial frequency branch line and a condensate pump frequency conversion regulating control valve group are provided along the fluid flow direction on the variable speed main line, the outlets of each industrial frequency branch line are connected in parallel and connected to the inlet of the condensate main line through the industrial frequency main line, the industrial frequency branch line is connected in parallel with the inlet of the condensate main line, and the industrial frequency branch line is connected in parallel with the inlet of the condensate main line. A first condenser pump power frequency regulating control valve group is arranged on the pipeline, a second condenser pump power frequency regulating control valve group is arranged on the power frequency main line, and the DCS control system is respectively connected with the power frequency conversion control unit, the deaerator, the condenser pump power frequency regulating control valve group, the first condenser pump power frequency regulating control valve group and the second condenser pump power frequency regulating control valve group by signals; the DCS control system controls the power frequency operation or variable frequency operation of the condenser pump through the power frequency conversion control unit, the DCS control system measures the deaerator water level, the DCS control system respectively controls the on-off of the condenser pump variable frequency regulating control valve group and the first condenser pump power frequency regulating control valve group, and controls the opening of the second condenser pump power frequency regulating control valve group and the variable frequency regulation module of the power frequency conversion control unit to synchronously track the deaerator water level.

[0010] Based on the above, the condensate pump variable frequency regulation control valve group includes a first electric isolation valve, the DCS control system is connected to the first electric isolation valve signal, and the DCS control system controls the on and off of the first electric isolation valve.

[0011] Based on the above, the first condensing pump power frequency regulating control valve group includes a second electric isolation valve, the DCS control system is connected to the second electric isolation valve signal, and the DCS control system controls the on and off of the second electric isolation valve.

[0012] Based on the above, the second condensing pump power frequency regulating control valve group includes a regulating valve and a third electric isolation valve arranged along the fluid flow direction. The DCS control system is respectively connected to the regulating valve and the third electric isolation valve signal. The DCS control system controls the on and off of the third electric isolation valve, and controls the opening of the regulating valve to track the deaerator water level in real time.

[0013] Based on the above, a condensate branch pipeline is arranged on the condensate main pipeline, and the condensate branch pipeline provides water to other condensate users. A booster pump is arranged on the condensate branch pipeline, and the DCS control system is connected with the booster pump signal. The DCS control system controls the start and stop of the booster pump according to the water pressure and flow in the condensate branch pipeline.

[0014] A method for controlling power-saving operation of a condensate water system, which uses the system for controlling power-saving operation of a condensate water system as described above to work, specifically: a DCS control system controls one of the condensate pumps through an industrial frequency conversion control unit to operate in industrial frequency mode as a standby pump waiting for use, and the other condensate pumps operate normally in variable frequency mode, the DCS control system controls the first electric isolation valve on the variable speed main line corresponding to the variable frequency operating condensate pump, the second electric isolation valve on the industrial frequency branch line corresponding to the condensate pump as a standby pump, and the third electric isolation valve on the industrial frequency main line to be opened, the second electric isolation valve on the industrial frequency branch line corresponding to the variable frequency operating condensate pump and the first electric isolation valve on the variable speed main line corresponding to the condensate pump as a standby pump are closed, and the DCS control system measures The current water level of the deaerator is measured, and the difference between the current water level of the deaerator and the set water level of the deaerator is obtained. The DCS control system performs frequency conversion regulation on the variable frequency condensate pump through the frequency conversion regulation module of the industrial frequency conversion control unit to control the condensate flow rate and realize the regulation and control of the deaerator operating water level. At the same time, the DCS control system collects the variable frequency operation status parameters of the variable frequency condensate pump, and controls the flow area of ​​the regulating valve to change with the change of the condensate flow rate according to the collected variable frequency operation status parameters, so that the opening of the regulating valve and the variable frequency operation status parameters synchronously track the deaerator water level, and the condensate branch pipeline provides water to other condensate users. At the same time, the DCS control system controls the start and stop of the booster pump according to the water pressure and flow in the condensate branch pipeline to meet the water demand of other condensate users; When the variable frequency condensing pump needs to be switched to the industrial frequency condensing pump, the DCS control system controls the variable frequency condensing pump to stop working through the industrial frequency conversion control unit, and controls the industrial frequency condensing pump to start working.

[0015] A system for power-saving operation control of a condensate system, comprising a condenser, a condensate pump, an industrial frequency conversion control unit, a condensate main line, a deaerator and a DCS control system, wherein at least two condensate pumps are provided, the outlet of the condenser is connected in parallel with the inlet of each condensate pump, the outlet of each condensate pump is connected in parallel with the inlet of the condensate main line through a variable speed main line, the outlet of the condensate main line is connected with the inlet of the deaerator, a check valve, an industrial frequency main line and a condensate pump variable frequency regulating control valve group are provided along the fluid flow direction on the variable speed main line, the outlets of each industrial frequency main line are connected in parallel and connected to the condensate main line The inlet of the pipeline is connected, and a condenser pump power frequency regulating control valve group is arranged along the fluid flow direction of the power frequency main line. The DCS control system is respectively connected with the power frequency conversion control unit, the deaerator, the condenser pump frequency conversion control valve group and the condenser pump power frequency regulating control valve group signal; the DCS control system controls the power frequency operation or frequency conversion operation of the condenser pump through the power frequency conversion control unit, the DCS control system measures the deaerator water level, the DCS control system controls the on and off of the condenser pump frequency conversion control valve group, and controls the opening of the condenser pump power frequency regulating control valve group and the frequency conversion regulation module of the power frequency conversion control unit to synchronously track the deaerator water level.

[0016] Based on the above, the condensate pump variable frequency regulation control valve group includes a first electric isolation valve, the DCS control system is connected to the first electric isolation valve signal, and the DCS control system controls the on and off of the first electric isolation valve.

[0017] Based on the above, the condenser pump power frequency regulation control valve group includes a second electric isolation valve, a regulating valve and a third electric isolation valve arranged along the fluid flow direction. The DCS control system is respectively connected to the second electric isolation valve, the regulating valve and the third electric isolation valve signals. The DCS control system controls the on and off of the second electric isolation valve and the third electric isolation valve, and controls the opening of the regulating valve to track the deaerator water level in real time.

[0018] Based on the above, a condensate branch pipeline is arranged on the condensate main pipeline, and the condensate branch pipeline provides water to other condensate users. A booster pump is arranged on the condensate branch pipeline, and the DCS control system is connected with the booster pump signal. The DCS control system controls the start and stop of the booster pump according to the water pressure and flow in the condensate branch pipeline.

[0019] Compared with the prior art, the present invention has outstanding substantial features and remarkable progress. Specifically, the beneficial effects of the present invention are as follows: the outlet of the condensate pump is connected with the inlet of the condensate water main line through the variable speed main line, and at the same time, a check valve, an industrial frequency branch line and a condensate pump variable frequency regulating control valve group are arranged on the variable speed main line along the fluid flow direction, the outlet of the industrial frequency branch line is connected with the inlet of the condensate water main line through the industrial frequency main line, a first condensate pump industrial frequency regulating control valve group is arranged on the industrial frequency branch line, and a second condensate pump industrial frequency regulating control valve group is arranged on the industrial frequency main line, and then the condensate pump variable frequency regulating control valve group and the corresponding first condensate pump industrial frequency regulating control valve group and the second condensate pump industrial frequency regulating control valve group connected in series form a parallel control valve combination, that is, the second condensate pump The regulating valve in the power frequency regulating control valve group is connected in parallel with the condenser pump variable frequency regulating control valve group, realizing the parallel connection of the pipelines of the two control modes of the condenser pump (power frequency operation standby and variable frequency operation normal working use), which can effectively remove the influence of the regulating valve on the resistance characteristics of the variable speed main pipeline in the system, making the system more energy-efficient. At the same time, the DCS control system controls the opening of the regulating valve and the variable frequency regulation module (frequency converter or chopper speed regulator) of the power frequency conversion control unit to synchronously track the deaerator water level, realizing the disturbance-free switching of the power frequency conversion of the condenser pump, effectively avoiding the impact of the process of switching the condenser pump from the variable frequency operation to the power frequency operation on the system and the deaerator water level, and ensuring the maximum safety, reducing the safety risks and workload of the operating personnel in switching equipment.

[0020] While meeting the requirements of the actual condensation and deoxygenation system for the water level control of the deaerator under the variable frequency operation, the variable frequency pipeline (variable speed main pipeline) is not affected by the valve resistance ratio of the regulating valve, and the power consumption of the condensate pump is reduced by about 5-45% (corresponding to different loads). The power plant steam turbine has great energy-saving and consumption-reducing potential, and the power consumption rate of the plant can be saved by 0.06-0.12 percentage points (corresponding to different loads); the power configuration of the frequency converter of the new project can be 30%-50% less than the motor power; the pressure level of the pipe valve after the regulating valve can also be reduced, the wall thickness can be reduced, and the investment in the condensate system equipment and the variable frequency control equipment can be reduced by about 30%.

[0021] If all existing power generation equipment in my country is modified according to the invention, about 0.06-0.12% more electricity can be provided to the society without increasing the installed capacity. Based on the power generation of about 6.7 trillion KWH in 2023, about 4.7 billion KWH can be provided more. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the system structure of the first embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the system structure of the second embodiment of the present invention.

[0024] In the figure: 1. Condenser; 2. Condensate pump; 3. Condensate main line; 4. Deaerator; 5. Variable speed main line; 6. Check valve; 7. Power frequency branch line; 8. Power frequency main line; 9. First electric isolation valve; 10. Second electric isolation valve; 11. Control valve; 12. Third electric isolation valve; 13. Condensate branch line; 14. Booster pump. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0026] like Figure 1As shown, a system for power-saving operation control of a condensate system comprises a condenser 1, a condensate pump 2, an industrial frequency conversion control unit (not shown), a condensate main line 3, a deaerator 4 and a DCS control system (not shown). At least two condensate pumps 2 are provided (three are provided here), the outlet of the condenser 1 is connected in parallel with the inlet of each condensate pump 2, the outlet of each condensate pump 2 is connected in parallel with the inlet of the condensate main line 3 through a variable speed main line 5, the outlet of the condensate main line 3 is connected with the inlet of the deaerator 4, a check valve 6, an industrial frequency branch line 7 and a condensate pump frequency conversion regulating control valve group are provided on the variable speed main line 5 along the fluid flow direction, the outlets of each industrial frequency branch line 7 are connected in parallel and connected to the inlet of the condensate main line 3 through the industrial frequency main line 8. The power frequency branch pipeline 7 is provided with a first condenser pump power frequency regulating control valve group, the power frequency main pipeline 8 is provided with a second condenser pump power frequency regulating control valve group, the DCS control system is respectively connected with the power frequency conversion control unit, the deaerator 4, the condenser pump frequency conversion regulating control valve group, the first condenser pump power frequency regulating control valve group and the second condenser pump power frequency regulating control valve group by signal; the DCS control system controls the power frequency operation or variable frequency operation of the condenser pump 2 through the power frequency conversion control unit, the DCS control system measures the water level of the deaerator 4, the DCS control system respectively controls the on-off of the condenser pump frequency conversion regulating control valve group and the first condenser pump power frequency regulating control valve group, and controls the opening of the second condenser pump power frequency regulating control valve group and the frequency conversion regulation module of the power frequency conversion control unit to synchronously track the water level of the deaerator 4.

[0027] Specifically, the condensate pump variable frequency regulation control valve group includes a first electric isolation valve 9 , and the DCS control system is connected to the first electric isolation valve 9 by signal, and the DCS control system controls the on and off of the first electric isolation valve 9 .

[0028] Specifically, the first condensate pump power frequency regulation control valve group includes a second electric isolation valve 10 , and the DCS control system is connected to the second electric isolation valve 10 by signal, and the DCS control system controls the on and off of the second electric isolation valve 10 .

[0029] Specifically, the second condensate pump power frequency regulation control valve group includes a regulating valve 11 and a third electric isolation valve 12 arranged along the fluid flow direction. The DCS control system is respectively connected to the regulating valve 11 and the third electric isolation valve 12 by signal. The DCS control system controls the on and off of the third electric isolation valve 12, and controls the opening of the regulating valve 11 to track the water level of the deaerator 4 in real time.

[0030] Specifically, a condensate branch pipeline 13 is provided on the condensate main pipeline 3, and the condensate branch pipeline 13 provides water to other condensate users. A booster pump 14 is provided on the condensate branch pipeline 13, and the DCS control system is connected with the booster pump 14 signal. The DCS control system controls the start and stop of the booster pump 14 according to the water pressure and flow in the condensate branch pipeline 13.

[0031] A method for controlling power-saving operation of a condensate water system, which uses the system for controlling power-saving operation of a condensate water system as described above to work, specifically: a DCS control system controls one of the condensate pumps 2 to operate in power frequency mode as a standby pump and wait for use through an industrial frequency conversion control unit, and the other condensate pumps 2 operate normally in variable frequency mode, the DCS control system controls the first electric isolation valve 9 on the variable speed main line 5 corresponding to the variable frequency condensate pump 2, the second electric isolation valve 10 and the third electric isolation valve 12 on the power frequency branch line 7 corresponding to the condensate pump 2 as a standby pump to be opened, the second electric isolation valve 10 on the power frequency branch line 7 corresponding to the variable frequency condensate pump 2 and the first electric isolation valve 9 on the variable speed main line 5 corresponding to the condensate pump 2 as a standby pump to be closed, the DCS control system measures the deoxygenation The current water level of the deaerator 4 is determined by the difference between the current water level of the deaerator 4 and the set water level of the deaerator 4. The DCS control system performs frequency conversion regulation on the variable frequency running condensate pump 2 through the frequency conversion regulation module of the industrial frequency conversion control unit to control the condensate flow rate and realize the regulation and control of the operating water level of the deaerator 4. At the same time, the DCS control system collects the variable frequency running state parameters of the variable frequency running condensate pump 2, and controls the flow area of ​​the regulating valve 11 to change with the change of the condensate flow rate according to the collected variable frequency running state parameters, so that the opening of the regulating valve 11 and the variable frequency running state parameters synchronously track the water level of the deaerator 4, and the condensate branch pipeline 13 provides water to other condensate users. At the same time, the DCS control system controls the start and stop of the booster pump 14 according to the water pressure and flow in the condensate branch pipeline 13 to meet the water demand of other condensate users; When the variable frequency running condensate pump 2 needs to be switched to the industrial frequency running condensate pump 2, the DCS control system controls the variable frequency running condensate pump 2 to stop working through the industrial frequency conversion control unit, and controls the industrial frequency running condensate pump 2 to start working.

[0032] Since the condensate pump variable frequency regulating control valve group and the corresponding series-connected first condensate pump power frequency regulating control valve group and second condensate pump power frequency regulating control valve group form a parallel control valve combination, that is, the regulating valve 11 in the second condensate pump power frequency regulating control valve group is connected in parallel with the condensate pump variable frequency regulating control valve group, the two control modes of the condensate pump 2 (power frequency operation standby and variable frequency operation normal working use) are connected in parallel. When the system is working, In the variable frequency operation state, there is no loss in the check valve 6 and the first electric isolation valve 9 on the variable speed main line 5, and the regulating valve 11 in the system does not affect the resistance characteristics of the variable speed main line 5, making the system more energy-efficient. The DCS control system performs variable frequency regulation on the variable frequency running condensate pump 2 through the variable frequency regulation module of the industrial variable frequency control unit, controls the condensate flow rate, and realizes the regulation and control of the operating water level of the deaerator 4.

[0033] When the frequency conversion fails and the power frequency is switched, the condensate pump 2 as the standby pump operates in the power frequency mode. Since the opening of the regulating valve 11 synchronously tracks the water level of the deaerator 4 under the control of the DCS control system, the safety of the system operation during the power conversion switching process of the condensate pump 2 and the stability of the water level of the deaerator 4 can be guaranteed, and the disturbance-free switching of the power conversion of the condensate pump 2 can be achieved.

[0034] When the high-load condensate pressure meets the water demand of other condensate users, water is supplied through the bypass of the booster pump 14, and the booster pump 14 does not work. When the low-load condensate pressure does not meet the water demand of other condensate users, the DCS control system controls the booster pump 14 to start and directly supply water through the booster pump 14. By adopting the technical solution of this embodiment, the variable frequency pipeline (variable speed main pipeline 5) is not affected by the valve resistance ratio of the regulating valve 11. Compared with the traditional condensate system, the higher the load, the greater the power saving rate, and the greater the potential for energy saving and consumption reduction, especially for the power plant turbine system, which has great potential for power saving and consumption reduction. The new project adopts the technical solution of this embodiment, which can greatly reduce the capacity of the condensate pump and the frequency conversion control part of the equipment, and reduce a large amount of equipment investment.

[0035] Embodiment 2 The difference from the first embodiment is that Figure 2 As shown, a system for power-saving operation control of a condensate system comprises a condenser 1, a condensate pump 2, an industrial frequency conversion control unit, a condensate main line 3, a deaerator 4 and a DCS control system. At least two condensate pumps 2 are provided. The outlet of the condenser 1 is connected in parallel with the inlet of each condensate pump 2. The outlet of each condensate pump 2 is connected in parallel with the inlet of the condensate main line 3 through a variable speed main line 5. The outlet of the condensate main line 3 is connected with the inlet of the deaerator 4. A check valve 6, an industrial frequency main line 8 and a condensate pump variable frequency regulating control valve group are provided on the variable speed main line 5 along the fluid flow direction. The outlets of each industrial frequency main line 8 are connected in parallel and connected to the inlet of the condensate main line 3. The outlets of the industrial frequency main lines 8 are connected in parallel with the inlet of the condensate main line 3. The first condenser pump power frequency regulating control valve group and the second condenser pump power frequency regulating control valve group are provided in the flow direction, and the DCS control system is respectively connected with the power frequency conversion control unit, the deaerator 4, the condenser pump frequency conversion regulating control valve group, the first condenser pump power frequency regulating control valve group and the second condenser pump power frequency regulating control valve group by signal; the DCS control system controls the power frequency operation or variable frequency operation of the condenser pump 2 through the power frequency conversion control unit, the DCS control system measures the water level of the deaerator 4, and the DCS control system controls the on-off of the condenser pump frequency conversion regulating control valve group and the first condenser pump power frequency regulating control valve group respectively, and controls the opening of the second condenser pump power frequency regulating control valve group and the frequency conversion regulation module of the power frequency conversion control unit to synchronously track the water level of the deaerator 4.

[0036] The condensate pump variable frequency regulating control valve group includes a first electric isolation valve 9 , and the DCS control system is connected with the first electric isolation valve 9 by signal, and the DCS control system controls the on and off of the first electric isolation valve 9 .

[0037] The condensate pump power frequency regulating control valve group includes a second electric isolation valve 10, a regulating valve 11 and a third electric isolation valve 12 arranged along the fluid flow direction. The DCS control system is respectively connected with the second electric isolation valve 10, the regulating valve 11 and the third electric isolation valve 12 by signal. The DCS control system controls the on and off of the second electric isolation valve 10 and the third electric isolation valve 12, and controls the opening of the regulating valve 11 to track the water level of the deaerator 4 in real time.

[0038] A condensate branch pipeline 13 is provided on the condensate main pipeline 3, and the condensate branch pipeline 13 provides water to other condensate users. A booster pump 14 is provided on the condensate branch pipeline 13, and the DCS control system is connected with the booster pump 14 signal. The DCS control system controls the start and stop of the booster pump 14 according to the water pressure and flow in the condensate branch pipeline 13.

[0039] Compared with the first embodiment, the second embodiment adds several groups of regulating valves 11 and the third electric isolation valve 12. The second embodiment has the same working principle and technical effect as the first embodiment, and the specific use method is not repeated here.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A system for power-saving operation control of a condensate system, comprising a condenser, a condensate pump, an industrial frequency conversion control unit, a condensate main line, a deaerator and a DCS control system. Features: At least two condensate pumps are provided, the outlet of the condenser is connected in parallel with the inlet of each condensate pump, the outlet of each condensate pump is connected in parallel with the inlet of the condensate main line through a variable speed main line, the outlet of the condensate main line is connected to the inlet of the deaerator, a check valve, a power frequency branch line and a condensate pump variable frequency regulation control valve group are provided along the fluid flow direction on the variable speed main line, the outlets of each power frequency branch line are connected in parallel and connected to the inlet of the condensate main line through a power frequency main line, a first condensate pump power frequency regulation control valve group is provided on the power frequency branch line, and a second condensate pump power frequency regulation control valve group is provided on the power frequency main line. The DCS control system is respectively connected with the industrial frequency conversion control unit, the deaerator, the condenser pump frequency conversion control valve group, the first condenser pump power frequency control valve group and the second condenser pump power frequency control valve group by signal; the DCS control system controls the power frequency operation or variable frequency operation of the condenser pump through the industrial frequency conversion control unit, the DCS control system measures the deaerator water level, the DCS control system respectively controls the on-off of the condenser pump frequency conversion control valve group and the first condenser pump power frequency control valve group, and controls the opening of the second condenser pump power frequency control valve group and the frequency conversion regulation module of the industrial frequency conversion control unit to synchronously track the deaerator water level.

2. The system for power-saving operation control of a condensate water system according to claim 1, Features: The condensate pump variable frequency regulating control valve group comprises a first electric isolation valve, the DCS control system is connected with the first electric isolation valve signal, and the DCS control system controls the on and off of the first electric isolation valve.

3. The system for power-saving operation control of a condensate water system according to claim 2, Features: The first condensing pump power frequency regulating control valve group includes a second electric isolation valve, the DCS control system is connected with the second electric isolation valve signal, and the DCS control system controls the on and off of the second electric isolation valve.

4. The system for power-saving operation control of a condensate water system according to claim 3, Features: The second condensate pump power frequency regulation control valve group includes a regulating valve and a third electric isolation valve arranged along the fluid flow direction. The DCS control system is respectively connected with the regulating valve and the third electric isolation valve signal. The DCS control system controls the on and off of the third electric isolation valve, and controls the opening of the regulating valve to track the deaerator water level in real time.

5. The system for power-saving operation control of a condensate water system according to claim 4, Features: A condensate branch pipeline is arranged on the condensate main pipeline, and the condensate branch pipeline provides water to other condensate users. A booster pump is arranged on the condensate branch pipeline, and the DCS control system is connected with the booster pump signal. The DCS control system controls the start and stop of the booster pump according to the water pressure and flow in the condensate branch pipeline.

6. A method for controlling power-saving operation of a condensate water system, Features: The system for power-saving operation control of the condensate water system as claimed in claim 5 is used to work, specifically: the DCS control system controls one of the condensate pumps to operate in the power frequency mode as a standby pump and wait for use through the power frequency conversion control unit, and the other condensate pumps are used normally in the variable frequency mode. The DCS control system controls the first electric isolation valve on the variable speed main line corresponding to the variable frequency running condensate pump, the second electric isolation valve on the power frequency branch line corresponding to the condensate pump as the standby pump, and the third electric isolation valve on the power frequency main line to be opened, the second electric isolation valve on the power frequency branch line corresponding to the variable frequency running condensate pump and the first electric isolation valve on the variable speed main line corresponding to the condensate pump as the standby pump are closed, and the DCS control system measures the current water The DCS control system performs frequency conversion regulation on the condensate pump in frequency conversion operation through the frequency conversion regulation module of the industrial frequency conversion control unit to control the condensate flow rate and realize the regulation and control of the deaerator operating water level. At the same time, the DCS control system collects the frequency conversion operation status parameters of the condensate pump in frequency conversion operation, and controls the flow area of ​​the regulating valve according to the collected frequency conversion operation status parameters to change with the change of the condensate flow rate, so that the opening of the regulating valve and the frequency conversion operation status parameters synchronously track the deaerator water level, and the condensate branch pipeline provides water to other condensate users. At the same time, the DCS control system controls the start and stop of the booster pump according to the water pressure and flow in the condensate branch pipeline to meet the water demand of other condensate users. When the variable frequency condensing pump needs to be switched to the industrial frequency condensing pump, the DCS control system controls the variable frequency condensing pump to stop working through the industrial frequency conversion control unit, and controls the industrial frequency condensing pump to start working.

7. A system for power-saving operation control of a condensate system, comprising a condenser, a condensate pump, an industrial frequency conversion control unit, a condensate main line, a deaerator and a DCS control system, Features: At least two condensate pumps are provided, the outlet of the condenser is connected in parallel with the inlet of each condensate pump, the outlet of each condensate pump is connected in parallel with the inlet of the condensate main line through the variable speed main line, the outlet of the condensate main line is connected with the inlet of the deaerator, a check valve, a power frequency main line and a condensate pump variable frequency regulating control valve group are provided along the fluid flow direction of the variable speed main line, the outlets of each power frequency main line are connected in parallel and connected to the inlet of the condensate main line, a condensate pump power frequency regulating control valve group is provided along the fluid flow direction of the power frequency main line, the DCS control system is respectively connected with the power frequency control unit, the deaerator, the condensate pump variable frequency regulating control valve group and the condensate pump power frequency regulating control valve group signal; the DCS control system controls the condensate pump to work at power frequency or at variable frequency through the power frequency control unit, the DCS control system measures the water level of the deaerator, the DCS control system controls the on-off of the condensate pump variable frequency regulating control valve group, and controls the opening of the condensate pump power frequency regulating control valve group and the variable frequency regulating module of the power frequency control unit to synchronously track the deaerator water level.

8. The system for controlling power-saving operation of a condensate water system according to claim 7, Features: The condensate pump variable frequency regulating control valve group comprises a first electric isolation valve, the DCS control system is connected with the first electric isolation valve signal, and the DCS control system controls the on and off of the first electric isolation valve.

9. The system for controlling power-saving operation of a condensate water system according to claim 8, Features: The condensate pump power frequency regulation control valve group includes a second electric isolation valve, a regulating valve and a third electric isolation valve arranged along the fluid flow direction. The DCS control system is respectively connected with the second electric isolation valve, the regulating valve and the third electric isolation valve signals. The DCS control system controls the on and off of the second electric isolation valve and the third electric isolation valve, and controls the opening of the regulating valve to track the deaerator water level in real time.

10. The system for power-saving operation control of a condensate water system according to claim 9, Features: A condensate branch pipeline is arranged on the condensate main pipeline, and the condensate branch pipeline provides water to other condensate users. A booster pump is arranged on the condensate branch pipeline, and the DCS control system is connected with the booster pump signal. The DCS control system controls the start and stop of the booster pump according to the water pressure and flow in the condensate branch pipeline.

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