CN209752608U - Wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant - Google Patents
Wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant Download PDFInfo
- Publication number
- CN209752608U CN209752608U CN201821982717.0U CN201821982717U CN209752608U CN 209752608 U CN209752608 U CN 209752608U CN 201821982717 U CN201821982717 U CN 201821982717U CN 209752608 U CN209752608 U CN 209752608U
- Authority
- CN
- China
- Prior art keywords
- frequency conversion
- circulating pump
- flue gas
- slurry circulating
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides a wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant, this system mainly are in wet flue gas desulfurization system, add frequency conversion equipment, and DCS soft controller is according to system's entry, export flue gas SO2And the difference value of the concentration signals sends an output frequency instruction to the frequency conversion device, the frequency conversion device drives the motor to operate, the motor drives the speed reducer to rotate, the speed reducer adjusts the rotating speed to a proper proportion and finally transmits the rotating speed to the slurry circulating pump, so that the circulating amount of the slurry circulating pump is adjusted, and the switch cabinet mainly provides a power supply for the frequency conversion device. The utility model can solve the problem of wetThe circulating amount of the desulfurization slurry cannot adapt to the SO at the inlet of the system2The concentration fluctuation changes, the operation and maintenance cost is high, the purposes of energy conservation and consumption reduction are achieved, and the stability and the automation degree of equipment and a system are improved.
Description
Technical Field
The utility model relates to an energy saving and consumption reduction system of thermal power plant, in particular to wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant.
Background
When the thermal power plant is built in an earlier stage, the allowance of auxiliary machines such as a slurry circulating pump and the like is generally selected according to the maximum requirement and a certain allowance, so that a large allowance exists in actual operation. Meanwhile, when auxiliary machines such as a slurry circulating pump and the like which run at a constant speed do not run under full load, particularly under low-load running, the working efficiency is rapidly reduced, and the serious waste of electric energy is caused.
With the increasing of the national requirements on environmental protection, energy conservation and emission reduction, energy-saving dispatching is carried out on a power grid, a thermal power plant competes for surfing the internet by taking coal consumption as an index, and in order to survive and develop, the thermal power plant needs to walk on a road for energy conservation and consumption reduction so as to realize the sustainable development of the environment and enterprises per se. Therefore, the energy conservation and consumption reduction are not only the mandatory constraints of national policies, but also the subjective requirements of the development of enterprises.
The frequency conversion technology is an important means for realizing energy conservation and emission reduction, improving the process flow, improving the product quality and the environment and promoting the technical progress at present. The working principle of frequency conversion is that under the adjustable condition of the frequency conversion speed regulation device, the motor has a reasonable load speed which accords with the actual operation condition, and the motor is ensured to have high efficiency under different rotating speeds, so that the power consumption is reduced, the motor can be protected, the transient impact when the load is started is avoided, the service life of the equipment is prolonged, and the purposes of energy conservation and consumption reduction are achieved.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant under the prerequisite that reduces the energy consumption. This system is including frequency conversion equipment, cubical switchboard, motor, speed reducer and the thick liquid circulating pump that is equipped with the DCS soft control ware, wherein: the DCS soft controller directly controls the flue gas SO at the inlet and the outlet of the system2Collecting a concentration signal difference value and an alarm signal, analyzing data information from a man-machine interface and a communication interface, and sending a control signal; the frequency conversion device is a unit for controlling the rotating speed of the slurry circulating pump, receives the control signal sent by the controller to drive the motor to operate, and changes the operating frequency of the motor so as to change the rotating speed of the slurry circulating pump; the switch cabinet is used for distributing electric energy to the DCS soft controller, the frequency conversion device and the motor and monitoring and protecting a power grid and electric equipment; the motor is used for driving the speed reducer to rotate; the speed reducer is used for adjusting the rotating speed and the transmission torque of the slurry circulating pump; the slurry circulating pump is controlled by the frequency conversion device, can perform frequency conversion adjustment and is used for desulfurizing the flue gas SO at the inlet2The rotating speed of the motor is changed by the change of the concentration SO as to maintain the flue gas SO at the outlet of the desulfurization system2The concentration was constant.
Moreover, the frequency conversion device is a universal frequency converter; the motor adopts an asynchronous starting permanent magnet synchronous motor; the circulating pump is a horizontal centrifugal pump and is mechanically sealed; the speed reducer adopts a water oil cooling mode; the input shaft of the speed reducer rotates anticlockwise.
The utility model has the advantages that:
The utility model discloses a wet flue gas desulfurization slurry circulating pump frequency conversion system mainly is in wet flue gas desulfurization system, adds frequency conversion equipment, and DCS soft controller is according to system's entry, export flue gas SO2And the difference value of the concentration signals sends an output frequency instruction to the frequency conversion device, the frequency conversion device drives the motor to operate, the motor drives the speed reducer to rotate, the speed reducer adjusts the rotating speed to a proper proportion and finally transmits the rotating speed to the slurry circulating pump, so that the circulating amount of the slurry circulating pump is adjusted, and the switch cabinet mainly provides a power supply for the frequency conversion device. By additionally arranging the frequency conversion device, the problem that the operation of frequently starting and stopping the slurry circulating pump on site and the slurry circulating amount cannot adapt to the SO at the inlet of the system2The concentration fluctuation changes, the operation and maintenance cost is high, the purposes of energy conservation and consumption reduction are achieved, and the stability and the automation degree of equipment and a system are improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more clear, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model provides a wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant, including frequency conversion equipment, cubical switchboard, motor, speed reducer and the slurry circulating pump that is equipped with the soft controller of DCS. The system is mainly characterized in that a frequency conversion device is additionally arranged in a wet desulphurization system, and a DCS (distributed control System) soft controller is used for controlling the SO (sulfur dioxide) content of flue gas according to the inlet and outlet of the system2The difference value of the concentration signals sends an output frequency instruction to the frequency conversion device, the frequency conversion device drives the motor to operate, the motor drives the speed reducer to rotate, the speed reducer adjusts the rotating speed to a proper proportion, and finally the rotating speed is transmitted to the slurry circulating pumpThereby adjusting the slurry circulation amount of the slurry circulation pump, wherein the switch cabinet mainly provides power for the frequency conversion device.
In the wet desulphurization system, a frequency conversion device is additionally arranged according to the SO at the inlet and the SO at the outlet of the system2The change of concentration sends an output frequency instruction to the frequency conversion device, changes the rotating speed of the motor, adjusts the rotating speed and the flow of the slurry circulating pump, and further solves the problem that the circulating amount of the slurry can not adapt to the SO at the inlet of the system2The concentration fluctuation and the operation cost are high, the purposes of energy saving and consumption reduction are realized, and the stability and the automation degree of equipment and a system are improved.
The operation of the present invention is described in detail below:
as can be seen from fig. 1, the system can be divided into: the three major parts of actuating mechanism, signal detection mechanism, control mechanism specifically are:
(l) An executing mechanism: the actuating mechanism consists of a slurry circulating pump, and the slurry circulating pump is used for supplying limestone slurry to a spraying pipe network at the upper part of the absorption tower from the lower part of the absorption tower. The frequency conversion pump is a slurry circulating pump which is controlled by a frequency conversion device and can be subjected to frequency conversion adjustment, and is used for controlling the frequency conversion pump according to a system inlet SO2the rotating speed of the motor is changed by the change of concentration fluctuation SO as to maintain the flue gas SO at the outlet of the desulfurization system2the concentration was constant.
The motor achieves the dragging action by a rotating magnetic field interacting with a current induced in the rotor windings by the rotating magnetic field by means of induction to produce an electromagnetic torque. The speed reducer is used for adjusting the rotating speed and the flow of the circulating pump.
The speed reducer adopts water-oil cooling in a cooling mode, and the input shaft of the speed reducer turns counterclockwise (seen from the end of the motor to the end of the pump). The circulating pump adopts a horizontal centrifugal pump and a mechanical seal.
(2) The signal detection mechanism: in the system control process, the signal to be detected comprises the inlet flue gas SO of the desulfurization system2Concentration signal and desulfurization system outlet flue gas SO2concentration signals and alarm signals. Inlet and outlet flue gas SO of desulfurization system2The concentration signal reflects the main performance index of the desulfurization systemit is the main feedback signal for the frequency conversion regulation control of the slurry circulating pump. The alarm signal reflects whether the system normally operates, whether the slurry circulating pump motor is overloaded and whether the frequency conversion device is abnormal, and the signal is a switching value signal. The signal detection is completed by the DCS soft controller. The DCS soft controller is used for controlling the inlet SO of the desulfurization device according to the system load2And sending an instruction to the frequency conversion device when the concentration changes.
(3) A control mechanism: the slurry circulating pump frequency conversion control system is generally integrated in the whole system of the desulfurization system and comprises a controller (DCS system), a frequency conversion device and an electric control device. The DCS controller is the core of the frequency conversion control system of the whole slurry circulating pump and directly controls the flue gas SO at the inlet and the outlet of the system2The concentration signal and the alarm signal are collected, data information from a man-machine interface and a communication interface is analyzed, a control signal for an actuating mechanism is sent out, and the actuating mechanism (namely a slurry circulating pump) is controlled through a variable-frequency speed regulator; the frequency conversion device is a unit for controlling the rotating speed of the slurry circulating pump, and the frequency conversion device tracks a control signal sent by the controller to change the operating frequency of the circulating pump so as to complete the rotating speed control of the slurry circulating pump.
The frequency conversion device absorbs AC 6KV/50Hz three-phase AC power from the power grid through the high-voltage switch cabinet, directly inputs the three-phase AC power into the primary winding of the phase-shifting transformer, outputs the three-phase AC power at a certain angle through the secondary extended triangular winding of the phase-shifting rectifier transformer, and respectively sends the three-phase AC power to the input end of each phase of power unit to finish the phase-shifting transformation of the high-voltage power. And then, through important links such as pre-charging, rectifying, filtering, PWM inversion and the like in the power unit, a sine wave voltage with variable frequency is output to a user high-voltage motor in a multi-power unit cascade structure mode, and the rotating speed of the motor is directly adjusted by changing the output frequency.
The switch cabinet is used for receiving and distributing electric energy and monitoring and protecting a power grid and electric equipment. The indoor complete set of distribution device comprises a single bus with three-phase alternating current of 50Hz and rated voltage of 3.6-12 kV and a bus segmentation system. The motor adopts an asynchronous starting permanent magnet synchronous motor, and can continuously run in full load when the supply voltage changes to within +/-10% of rated voltage, or the frequency changes to within +/-5% of rated frequency, or the voltage and the frequency change simultaneously, but the absolute value of the sum of the changes is within 10%.
The utility model discloses an in wet flue gas desulfurization system, add frequency conversion equipment, solve the scene and frequently open the operation and the thick liquid circulation volume that open and stop the thick liquid circulating pump and can not adapt to system's entry SO2The concentration fluctuation and the operation and maintenance cost are high, so that the purposes of saving energy and reducing consumption are achieved, and the stability and the automation degree of equipment and a system are improved.
Although the embodiments of the present invention have been described, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the principle of the present invention, and these modifications and variations should be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant which characterized in that: including frequency conversion device, cubical switchboard, motor, speed reducer and the slurry circulating pump that is equipped with the soft controller of DCS, wherein:
The DCS soft controller directly controls the flue gas SO at the inlet and the outlet of the system2Collecting a concentration signal difference value and an alarm signal, analyzing data information from a man-machine interface and a communication interface, and sending a control signal;
The frequency conversion device is used for controlling the rotating speed of the slurry circulating pump, receiving the control signal sent by the controller, driving the motor to run, and changing the running frequency of the motor so as to change the rotating speed of the slurry circulating pump;
The switch cabinet is used for distributing electric energy to the DCS soft controller, the frequency conversion device and the motor and monitoring and protecting a power grid and electric equipment;
The motor is used for driving the speed reducer to rotate;
The speed reducer is used for adjusting the rotating speed and the transmission torque of the slurry circulating pump;
The slurry circulating pump is controlled by the frequency conversion device and can be subjected to frequency conversion adjustment for desulfurizationInlet flue gas SO2The rotating speed of the motor is changed by the change of the concentration SO as to maintain the flue gas SO at the outlet of the desulfurization system2The concentration was constant.
2. The wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant of claim 1, characterized in that: the frequency conversion device is a universal frequency converter.
3. The wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant of claim 1, characterized in that: the motor adopts an asynchronous starting permanent magnet synchronous motor.
4. The wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant of claim 1, characterized in that: the circulating pump is a horizontal centrifugal pump and is mechanically sealed.
5. the wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant of claim 1, characterized in that: the speed reducer adopts a water oil cooling mode.
6. The wet desulphurization slurry circulation pump frequency conversion system of thermal power plant according to claim 1 or 5, characterized in that: the input shaft of the speed reducer rotates anticlockwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821982717.0U CN209752608U (en) | 2018-11-29 | 2018-11-29 | Wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821982717.0U CN209752608U (en) | 2018-11-29 | 2018-11-29 | Wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209752608U true CN209752608U (en) | 2019-12-10 |
Family
ID=68745128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821982717.0U Active CN209752608U (en) | 2018-11-29 | 2018-11-29 | Wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209752608U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112791567A (en) * | 2020-12-25 | 2021-05-14 | 上海曜中能源科技有限公司 | Automatic speed regulating system of wet desulphurization slurry pump and control method |
| CN113521998A (en) * | 2021-07-05 | 2021-10-22 | 国能龙源环保有限公司 | Sensitive and economical wet flue gas SO of desulfurization outletxConcentration control method |
| CN114281042A (en) * | 2021-12-23 | 2022-04-05 | 昆岳互联环境技术(江苏)有限公司 | Energy-saving control method and device for wet desulphurization circulating system |
-
2018
- 2018-11-29 CN CN201821982717.0U patent/CN209752608U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112791567A (en) * | 2020-12-25 | 2021-05-14 | 上海曜中能源科技有限公司 | Automatic speed regulating system of wet desulphurization slurry pump and control method |
| CN113521998A (en) * | 2021-07-05 | 2021-10-22 | 国能龙源环保有限公司 | Sensitive and economical wet flue gas SO of desulfurization outletxConcentration control method |
| CN114281042A (en) * | 2021-12-23 | 2022-04-05 | 昆岳互联环境技术(江苏)有限公司 | Energy-saving control method and device for wet desulphurization circulating system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209752608U (en) | Wet flue gas desulfurization slurry circulating pump frequency conversion system of thermal power plant | |
| CN102340270B (en) | Programmable logic controller (PLC)-and-frequency-converter-based energy saving control system and method for doubly-fed motor | |
| CN106026122A (en) | Integrated asynchronous excitation phase modifier and reactive compensation and active balance method thereof | |
| CN102570504B (en) | Frequency-conversion main power supply system for thermal power plant | |
| CN201699603U (en) | High frequency power supply for monocrystalline silicon furnace | |
| CN203911836U (en) | Blower fan frequency conversion speed regulation system with double PWM control | |
| CN101409501A (en) | Subharmonic intelligent electricity saver | |
| CN210518154U (en) | Multi-frequency converter single-motor fracturing electric control system | |
| CN105207555B (en) | A kind of Digital-typed Generator automatic regulating system and its method | |
| CN101860316A (en) | Self-adaptive load following control technical system | |
| CN210807129U (en) | Rectifier and low-voltage inverter array power supply system | |
| CN202612163U (en) | Fan variable frequency speed control system based on programmable logic controller (PLC) | |
| CN202121546U (en) | Digitalized frequency converter control system device | |
| CN208364453U (en) | The converting operation device of desulfurization single-stage high-speed centrifugal blower | |
| Ma | Study on the application of permanent magnet synchronous motors in underground belt conveyors | |
| CN100384082C (en) | Method and apparatus for controlling AC induction motor energy-saving operation | |
| CN208268070U (en) | A kind of converting operation device of desulfurization roots blower | |
| CN207363856U (en) | A kind of device for controlling thickener underflow pump | |
| CN206135421U (en) | Voltage stabilization group wells is DC inversion crowd's device altogether | |
| CN204886782U (en) | Energy -saving variable frequency speed governing(VFSG) three phase machine | |
| CN108457890A (en) | The converting operation device and converting operation method of desulfurization single-stage high-speed centrifugal blower | |
| CN205754107U (en) | A kind of motor dynamics star-delta conversion energy-conserving device | |
| CN201122931Y (en) | High voltage frequency-conversion speed-control device of high capacity electric motor | |
| CN201165444Y (en) | Elevator power-saving device | |
| CN216248269U (en) | Low-voltage ride through capability testing device of high-voltage frequency converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |