CN111412389A - High-pressure variable frequency pump energy-saving device and control method thereof - Google Patents
High-pressure variable frequency pump energy-saving device and control method thereof Download PDFInfo
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- CN111412389A CN111412389A CN202010235044.8A CN202010235044A CN111412389A CN 111412389 A CN111412389 A CN 111412389A CN 202010235044 A CN202010235044 A CN 202010235044A CN 111412389 A CN111412389 A CN 111412389A
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- Prior art keywords
- pressure
- frequency pump
- water
- pipe
- minimum flow
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
Abstract
The invention discloses an energy-saving device of a high-pressure variable frequency pump, which is used in a steel plate rolling line dephosphorization system, the dephosphorization system comprises a low-pressure buffer water tank, a high-pressure variable frequency pump, an energy accumulator, an air compressor and an injection valve, the inlet end of the high-pressure variable frequency pump is connected with the low-pressure buffer water tank through a low-pressure water inlet pipe, the outlet end of the high-pressure variable frequency pump is connected with the energy accumulator through a main water outlet pipe, the outlet end of the high-pressure variable frequency pump is provided with a one-way valve, the high-pressure air compressor is connected with the energy accumulator through an air pipe, the energy accumulator removes phosphorus through a high-pressure water pipe nozzle valve, a branch water pipe is arranged on the main water outlet pipe and is arranged at.
Description
Technical Field
The invention relates to an energy-saving device of a high-pressure variable-frequency pump and a control method thereof.
Background
The high-pressure variable-frequency water pump is used as a water replenishing system to normally, reliably and safely operate heart equipment, the performance of the high-pressure variable-frequency water pump is directly related to whether the system is successful or not, and in the system, the high-pressure variable-frequency water pump is used for conveying liquid and transferring energy through the liquid, converting mechanical energy into potential energy, and finally converting the potential energy into kinetic energy to strike on steel billets for descaling. The high-pressure frequency conversion water pump set mainly comprises a water inlet pipe, a pump body, a speed increaser, a frequency conversion motor, a one-way valve, an output valve, a minimum flow valve and the like.
The descaling pumps of south steel wide and thick plate plants are all variable frequency pumps, and the descaling pumps run at high and low speeds, and have the main advantages of energy consumption saving and the following two running states.
1. When the descaling pump runs at a high speed, the frequency of the descaling pump is 49HZ (the high-speed running frequency is adjusted according to the maximum economic benefit value of the descaling pump), and at the moment, a check valve at the outlet of the descaling pump is opened to supplement water into the energy accumulator and the pipeline;
2. when descaling water is not needed on site or the liquid level in the energy accumulator is supplemented to a normal position, the frequency of the descaling pump is reduced to 15HZ, the one-way valve of the outlet of the descaling pump is closed, the descaling pump can generate certain heat when running at low speed, and the high-temperature water needs to be discharged from the minimum flow valve at the moment, so that the descaling pump is prevented from cavitation erosion, and the normal and continuous running of the descaling pump is ensured.
Each group of descaling pump outlet branch pipes are provided with a minimum flow valve, when the descaling pump operates normally and does not supply water to the outside, the descaling pump can generate certain heat, and the high-temperature water needs to be discharged from the minimum flow valve, so that the descaling pump is prevented from cavitation erosion, and the normal and continuous operation of the descaling pump is ensured.
The shell temperature control has the following problems:
1. the temperature of the descaling pump shell is higher than 50 ℃, the temperature of the shell is always higher than 35 ℃ after the minimum flow valve is opened, and the minimum flow valve is equivalent to a normally open state in the state. The temperature of the pump shell is higher than 35 ℃ when the pump is normally operated in actual field tracking, the temperature of the pump shell reaches 38 ℃ when the pump is stopped, and the temperature control logic has unreasonable phenomenon.
2. The temperature of the shell is greatly influenced by the ambient temperature in summer and winter and the temperature of low-pressure turbid circulating water, and the control range of the minimum flow valve switch is difficult to control.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control method for energy saving of a high-pressure variable-frequency pump, aiming at the defects in the prior art, so that energy can be saved, and the actual efficiency of the high-pressure variable-frequency pump can be improved.
The technical scheme for solving the technical problems is as follows: the utility model provides a high-pressure inverter pump economizer, in being arranged in steel sheet roll line dephosphorization system, this dephosphorization system includes low pressure buffering water pitcher, high-pressure inverter pump, the energy storage ware, air compressor machine and jet valve, this high-pressure inverter pump entrance point passes through low pressure inlet tube and connects low pressure buffering water pitcher, its exit end goes out the water main pipe and connects the energy storage ware, and at high-pressure inverter pump exit end check valve, high-pressure air compressor machine passes through the trachea and is connected with the energy storage ware, this energy storage ware carries out the dephosphorization through high-pressure water pipe nozzle valve, install the branch road water pipe on going out the water main pipe, and this branch road water pipe is installed in the check valve front end.
The invention further defines the scheme:
the pressure sensors are respectively arranged on the main water outlet pipe and the branch water pipes.
The temperature monitor is arranged on the high-pressure variable-frequency pump.
The bypass branch pipe for removing phosphorus is arranged on the branch water pipe, and is arranged at the front end of the minimum flow valve.
The throttle plate is mounted on the bypass water pipe.
The invention also provides a control method of the energy-saving device of the high-pressure variable-frequency pump, which is characterized by comprising the following steps: the method specifically comprises the following steps:
when the rolling line does not descale: the high-pressure variable frequency pump runs at a low speed, the high pressure in the energy accumulator closes the outlet one-way valve of the high-pressure variable frequency pump, the outlet pressure of the high-pressure variable frequency pump is 3-4 MPa, the minimum flow valve is opened, the electromagnetic valve is closed, and low-pressure water is discharged into the slag runner through the minimum flow valve;
when descaling is carried out on the rolling line, the high-pressure variable frequency pump is run at a high speed, the pressure of the main water outlet pipe is raised, the minimum flow valve is closed, the single-valve direction and throttle plate are opened, and the main water outlet pipe supplies water to the energy accumulator and the bypass branch pipe, so that the energy accumulator and the bypass branch pipe are descaled together;
after dephosphorization is finished, the throttle plate is closed, the high-pressure variable-frequency pump continues to supply water to the energy accumulator through the main water outlet pipe, when the pressure of any one branch pipe of the main water outlet pipe and the branch water pipes exceeds 26MPa, the high-pressure variable-frequency pump forcibly reduces the speed, and the minimum flow valve is opened after the speed reduction;
fourthly, when the temperature of a temperature monitor on the high-pressure variable-frequency pump exceeds 65 ℃, forcibly opening the minimum flow valve, when the temperature is lower than 65 ℃, opening the minimum flow valve if the high-pressure variable-frequency pump runs at a low speed, and closing the minimum flow valve if the high-pressure variable-frequency pump runs at a high speed;
and (V) mounting a limit switch on the minimum flow valve, if the limit switch signal cannot be detected, checking the minimum flow valve, and replacing the minimum flow valve when a fault occurs.
The invention has the beneficial effects that: the invention effectively reduces the steel descaling power consumption, also realizes the water saving when the high-pressure variable frequency pump runs at high speed, not only avoids wasting resources, but also greatly saves the production cost, the temperature monitor is arranged on the high-pressure variable frequency pump, when the temperature is overhigh and is opened, the minimum flow valve is opened to discharge the high-temperature water in the high-pressure variable frequency pump to take away part of heat, the harm to the high-pressure variable frequency pump is reduced, the cavitation erosion of the descaling pump is prevented, the normal and continuous running of the high-pressure variable frequency pump is ensured, and a large amount of water for descaling is also saved.
Drawings
FIG. 1 is a schematic view of example 1.
Detailed Description
Example 1
The embodiment provides a control method for energy saving of a high-pressure variable frequency pump, which is used in a phosphorus removal system, and as shown in figure 1, the control method comprises a low-pressure buffer water tank 1, a high-pressure variable frequency pump 2, an energy accumulator 3, an air compressor 4 and an injection valve 5, wherein the high-pressure variable frequency pump is provided with a temperature monitor 6, the inlet end of the high-pressure variable frequency pump is connected with the low-pressure buffer water tank through a low-pressure water inlet pipe 7, the outlet end of the high-pressure variable frequency pump is connected with the energy accumulator through a main water pipe 8, the outlet end of the high-pressure variable frequency pump is provided with a one-way valve 9, the high-pressure air compressor is connected with the energy accumulator through an air pipe, the energy accumulator removes phosphorus through a high-pressure water pipe nozzle valve, a branch water pipe 10 is arranged on the main water pipe, the branch water pipe is arranged, the bypass branch is disposed at the front end of the minimum flow valve, and a throttle plate 14 is mounted on the bypass water pipe.
The invention also provides a control method of the energy-saving device of the high-pressure variable-frequency pump, which is characterized by comprising the following steps: the method specifically comprises the following steps:
when the rolling line does not descale: the high-pressure variable frequency pump runs at a low speed, the high pressure in the energy accumulator closes the outlet one-way valve of the high-pressure variable frequency pump, the outlet pressure of the high-pressure variable frequency pump is 4MPa, the minimum flow valve is opened, the electromagnetic valve is closed, and the low-pressure water is discharged into the slag runner through the minimum flow valve;
when descaling is carried out on the rolling line, the high-pressure variable frequency pump is run at a high speed, the pressure of the main water outlet pipe is raised, the minimum flow valve is closed, the single-valve direction and throttle plate are opened, and the main water outlet pipe supplies water to the energy accumulator and the bypass branch pipe, so that the energy accumulator and the bypass branch pipe are descaled together;
after dephosphorization is finished, the throttle plate is closed, the high-pressure variable-frequency pump continues to supply water to the energy accumulator through the main water outlet pipe, when the pressure of any one branch pipe of the main water outlet pipe and the branch water pipes exceeds 26MPa, the high-pressure variable-frequency pump forcibly reduces the speed, and the minimum flow valve is opened after the speed reduction;
fourthly, when the temperature of a temperature monitor on the high-pressure variable-frequency pump exceeds 65 ℃, forcibly opening the minimum flow valve, when the temperature is lower than 65 ℃, opening the minimum flow valve if the high-pressure variable-frequency pump runs at a low speed, and closing the minimum flow valve if the high-pressure variable-frequency pump runs at a high speed;
and (V) mounting a limit switch on the minimum flow valve, if the limit switch signal cannot be detected, checking the minimum flow valve, and replacing the minimum flow valve when a fault occurs.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. The utility model provides a high-pressure inverter pump economizer for in the steel sheet rolls line dephosphorization system, this dephosphorization system includes low pressure buffering water pitcher, high-pressure inverter pump, the energy storage ware, air compressor machine and injection valve, this high-pressure inverter pump entrance point advances water piping connection low pressure buffering water pitcher through the low pressure, its exit end goes out water main pipe and connects the energy storage ware, and at high-pressure inverter pump exit end check valve, high-pressure air compressor machine passes through the trachea and is connected with the energy storage ware, this energy storage ware carries out dephosphorization, its characterized in that through high-pressure water pipe nozzle valve: a branch water pipe is installed on the water outlet main pipe and is installed at the front end of the one-way valve, and a minimum flow valve is installed on the branch water pipe.
2. The energy-saving device for the high-voltage variable-frequency pump according to claim 1, characterized in that: and the main water outlet pipe and the branch water pipes are respectively provided with a pressure sensor.
3. The energy-saving device for the high-voltage variable-frequency pump according to claim 1, characterized in that: and a temperature monitor is arranged on the high-pressure variable-frequency pump.
4. The energy-saving device for the high-voltage variable-frequency pump according to claim 1, characterized in that: and a bypass branch pipe for removing phosphorus is arranged on the branch water pipe and is arranged at the front end of the minimum flow valve.
5. The high-pressure variable frequency pump energy-saving device according to claim 4, characterized in that: and a throttle plate is arranged on the bypass water pipe.
6. The control method of the energy-saving device of the high-pressure variable-frequency pump according to any one of claims 1 to 5, characterized in that: the method specifically comprises the following steps:
when the rolling line does not descale: the high-pressure variable frequency pump runs at a low speed, the high pressure in the energy accumulator closes the outlet one-way valve of the high-pressure variable frequency pump, the outlet pressure of the high-pressure variable frequency pump is 3-4 MPa, the minimum flow valve is opened, the electromagnetic valve is closed, and low-pressure water is discharged into the slag runner through the minimum flow valve;
when descaling is carried out on the rolling line, the high-pressure variable frequency pump is run at a high speed, the pressure of the main water outlet pipe is raised, the minimum flow valve is closed, the single-valve direction and throttle plate are opened, and the main water outlet pipe supplies water to the energy accumulator and the bypass branch pipe, so that the energy accumulator and the bypass branch pipe are descaled together;
after dephosphorization is finished, the throttle plate is closed, the high-pressure variable-frequency pump continues to supply water to the energy accumulator through the main water outlet pipe, when the pressure of any one branch pipe of the main water outlet pipe and the branch water pipes exceeds 26MPa, the high-pressure variable-frequency pump forcibly reduces the speed, and the minimum flow valve is opened after the speed reduction;
fourthly, when the temperature of a temperature monitor on the high-pressure variable-frequency pump exceeds 65 ℃, forcibly opening the minimum flow valve, when the temperature is lower than 65 ℃, opening the minimum flow valve if the high-pressure variable-frequency pump runs at a low speed, and closing the minimum flow valve if the high-pressure variable-frequency pump runs at a high speed;
and (V) mounting a limit switch on the minimum flow valve, if the limit switch signal cannot be detected, checking the minimum flow valve, and replacing the minimum flow valve when a fault occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235044.8A CN111412389A (en) | 2020-03-30 | 2020-03-30 | High-pressure variable frequency pump energy-saving device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235044.8A CN111412389A (en) | 2020-03-30 | 2020-03-30 | High-pressure variable frequency pump energy-saving device and control method thereof |
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| CN111412389A true CN111412389A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010235044.8A Pending CN111412389A (en) | 2020-03-30 | 2020-03-30 | High-pressure variable frequency pump energy-saving device and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042553A (en) * | 2021-02-25 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Finish descaling device and hot rolling production line of hot rolling |
| CN114135794A (en) * | 2021-11-22 | 2022-03-04 | 杭州数梦工场科技有限公司 | Method and device for detecting leakage of water network |
-
2020
- 2020-03-30 CN CN202010235044.8A patent/CN111412389A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042553A (en) * | 2021-02-25 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Finish descaling device and hot rolling production line of hot rolling |
| CN113042553B (en) * | 2021-02-25 | 2023-02-17 | 首钢京唐钢铁联合有限责任公司 | Hot rolling fine descaling device and hot rolling production line |
| CN114135794A (en) * | 2021-11-22 | 2022-03-04 | 杭州数梦工场科技有限公司 | Method and device for detecting leakage of water network |
| CN114135794B (en) * | 2021-11-22 | 2023-11-24 | 杭州数梦工场科技有限公司 | Method and device for detecting leakage of water network |
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Application publication date: 20200714 |