CN210303155U - One-to-two slurry circulating system of frequency converter - Google Patents
One-to-two slurry circulating system of frequency converter Download PDFInfo
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- CN210303155U CN210303155U CN201921021415.1U CN201921021415U CN210303155U CN 210303155 U CN210303155 U CN 210303155U CN 201921021415 U CN201921021415 U CN 201921021415U CN 210303155 U CN210303155 U CN 210303155U
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Abstract
The utility model discloses a converter one drags two slurry circulation systems, including converter, first slurry circulating pump, second slurry circulating pump, first power and second power, the one end and the first slurry circulating pump or the second slurry circulating pump of converter are connected, and the other end is connected with first power or second power. The utility model discloses an use and make desulfurization system possess certain along with former flue gas SO2The linear regulation performance and the rapid regulation performance of concentration and unit load fluctuation have certain depth regulation performance; frequent start and stop of a slurry circulating pump are avoided, and the safety and stability of the desulfurization system are improved; when pulpWhen the pump body is seriously abraded or broken down due to long-time operation of the liquid circulating pump, the frequency converter can be switched to another pump, so that the frequency conversion regulation is always in a better state; greatly reduces the operating cost of the desulfurization system and has obvious energy-saving effect.
Description
Technical Field
The utility model belongs to the technical field of wet flue gas desulfurization, concretely relates to converter one drags two thick liquids circulation system.
Background
In recent two years, a large number of domestic coal-fired power generating units begin to carry out flexible technical transformation and gradually participate in deep peak regulation, and a Flue Gas Desulfurization (FGD) system adopting a limestone-gypsum wet desulphurization process is still regulated by the traditional modes of slurry circulating pump combined operation optimization, absorption tower slurry pH value regulation and the like, and lacks of rapid regulation performance and deep regulation performance, SO that in order to ensure stable operation of the desulphurization system and avoid SO2The emission with excessive concentration usually adopts a conservative operation mode, thereby causing the problem of higher energy consumption.
The energy consumption of the desulfurization system generally accounts for about 0.5-1.5% of the generating capacity of the unit along with the sulfur content of the fire coal, the extremely high energy can reach more than 2.0%, and the slurry circulating pump is used as a main power consumption device, and the energy consumption accounts for about 65-76% of the energy consumption of the whole desulfurization system. With the development of power electronic technology, microelectronic technology and modern control theory, the variable frequency speed regulation of the high-power alternating current motor is developed greatly, and now becomes an important means for optimizing process flow, saving energy and reducing consumption in the industrial field.
Meanwhile, the operation environment of the slurry circulating pump is severe, the flow inside the pump is the flow of solid-liquid two-phase fluid, the phenomenon of operation current reduction caused by pump abrasion generally occurs along with long-time operation, and the pump has to be repaired or replaced when the pump is serious. Severely worn pumps have a large impact on flow, pressure and power.
In summary, the slurry circulation system of the existing wet desulphurization system has the following problems:
(1) the safety and stability of the desulfurization system are insufficient: frequent starting and stopping of the high-power pump can affect the service life of a motor of the pump, the stability of the liquid level of the absorption tower and the voltage fluctuation of a power grid in a plant;
(2) the desulfurization system has insufficient flexibility: lack of associated flue gas SO2Linear adjustment performance and rapid adjustment performance of concentration and unit load fluctuation; lack of depth adjustment capability;
(3) the frequency converter utilization ratio is not high: when one frequency converter is used for one slurry circulating pump, the abrasion of the pump is aggravated by long-time operation, so that the frequency conversion adjusting space of the pump is reduced; when the slurry circulating pump fails, the frequency converter cannot be effectively utilized;
(4) the slurry circulating system can not be adjusted, and the operation energy consumption is higher.
SUMMERY OF THE UTILITY MODEL
Based on above demand and shortcoming, the utility model aims at providing a converter one drags two thick liquids circulation system to improve the safety and stability nature of wet flue gas desulfurization system operation, adjust the flexibility, improve the utilization ratio of converter simultaneously, still play energy-conserving effect in addition.
The purpose of the utility model is realized through the following technical scheme:
a frequency converter one-driving-two slurry circulating system comprises a frequency converter, a first slurry circulating pump, a second slurry circulating pump, a first power supply and a second power supply; wherein the content of the first and second substances,
one end of the frequency converter is connected with the first slurry circulating pump or the second slurry circulating pump, and the other end of the frequency converter is connected with the first power supply or the second power supply;
the first slurry circulating pump is connected with a first power supply through a frequency converter or is directly connected with the first power supply;
and the second slurry circulating pump is connected with a second power supply through a frequency converter or is directly connected with the second power supply.
The utility model discloses a further improvement lies in, be provided with first switch on the circuit that converter and first power are connected.
The utility model discloses a further improvement lies in, be provided with the second switch on the circuit that converter and second power are connected.
The utility model discloses a further improvement lies in, first power output end is provided with first circuit breaker.
The utility model discloses a further improvement lies in, second power output end is provided with the second circuit breaker.
The utility model discloses further improvement lies in, be provided with first duplicate switch on the circuit that first slurry circulating pump and converter and first power are connected.
The utility model discloses a further improvement lies in, be provided with the second duplicate switch on the circuit that second slurry circulating pump and converter and second power are connected.
The utility model discloses further improvement lies in, two slurry circulating pumps constitute slurry circulating line with filter screen, valve, spraying layer and nozzle and exit pipeline respectively.
The utility model discloses further improvement lies in, there is minimum frequency conversion value in every slurry circulating pump's speed governing control.
The utility model discloses following beneficial effect has:
(1) the safety and stability of the desulfurization system are improved, and the influence on the service life of a motor of the pump, the stability of the liquid level of the absorption tower and the voltage fluctuation of a power grid in a plant caused by the frequent start and stop of a slurry circulating pump are avoided;
(2) SO that the desulfurization system has a certain amount of flue gas SO2The linear regulation performance and the rapid regulation performance of concentration and unit load fluctuation have certain depth regulation performance;
(3) the slurry circulating pump adopts a one-driving-two frequency conversion mode, and when the pump is seriously abraded to influence the adjusting performance or cause a fault, the frequency converter can be switched to another pump, so that the frequency conversion adjustment is always in a better state;
(4) the energy-saving effect is obvious after the slurry circulating system is modified.
Drawings
Fig. 1 is an electrical primary wiring diagram of the present invention.
Description of reference numerals:
the device comprises a frequency converter 1, a first slurry circulating pump 2, a second slurry circulating pump 3, a first power supply 4, a second power supply 5, a first circuit breaker 6, a second circuit breaker 7, a first switch 8, a second switch 9, a first duplex switch 10 and a second duplex switch 11.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a frequency converter one-to-two slurry circulation system, which comprises a frequency converter 1, a first slurry circulation pump 2, a second slurry circulation pump 3, a first power supply 4 and a second power supply 5; one end of the frequency converter 1 is connected with the first slurry circulating pump 2 or the second slurry circulating pump 3, and the other end of the frequency converter is connected with the first power supply 4 or the second power supply 5; the first slurry circulating pump 2 is connected with a first power supply 4 through a frequency converter 1 or is directly connected with the first power supply 4; the second slurry circulating pump 3 is connected with a second power supply 5 through the frequency converter 1, or is directly connected with the second power supply 5.
When the first breaker 6 and the first switch 8 are closed and the first duplex switch 10 is closed at the frequency conversion position, the first slurry circulating pump 2 is in a frequency conversion operation mode; at this moment, the second switch 9 is disconnected, the second duplex switch 11 is switched on at a power frequency position, if the second circuit breaker 7 is switched on, the second slurry circulating pump 3 is in a power frequency operation mode, and if the second circuit breaker 7 is disconnected, the second slurry circulating pump 3 is in a stop-motion state.
When the second breaker 7 and the second switch 9 are closed and the second duplex switch 11 is closed at the frequency conversion position, the second slurry circulating pump 3 is in a frequency conversion operation mode; at this moment, the first switch 8 is switched off, the first duplex switch 10 is switched on at a power frequency position, if the first circuit breaker 6 is switched on, the first slurry circulating pump 2 is in a power frequency operation mode, and if the first circuit breaker 6 is switched off, the first slurry circulating pump 2 is in a stop-motion state.
When the first switch 8 and the second switch 9 are switched off, the first duplex switch 10 and the second duplex switch 11 are switched on at a power frequency position, if the first circuit breaker 6 is switched on, the first slurry circulating pump 2 is in a power frequency operation mode, and if the first circuit breaker 6 is switched off, the first slurry circulating pump 2 is in a stop-motion state; if second circuit breaker 7 closes, then second thick liquid circulating pump 3 is in power frequency mode of operation, if second circuit breaker 7 disconnection, then second thick liquid circulating pump 3 is in the off-stream state.
The first slurry circulating pump 2 or the second slurry circulating pump 3 in the frequency conversion operation mode enables the desulfurization system to have certain SO along with the original flue gas2The concentration and unit load fluctuation linear regulation performance and the rapid regulation performance have certain depth regulation performance, and in addition, frequent start and stop of a slurry circulating pump are also avoided, and the safety and stability of the desulfurization system are improved.
When the first slurry circulating pump 2 or the second slurry circulating pump 3 causes serious abrasion or failure of the pump body due to long-time operation, the frequency converter can be switched to the other pump, so that the frequency conversion adjustment is always in a better state.
The application of the one-to-two slurry circulating system of the frequency converter enables the energy-saving effect of the desulfurization system to be obvious and greatly reduces the operating cost.
Various modifications may be made to the above without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is therefore intended to be limited not by the above description, but rather by the scope of the appended claims.
Claims (9)
1. A frequency converter one-driving-two slurry circulating system is characterized by comprising a frequency converter (1), a first slurry circulating pump (2), a second slurry circulating pump (3), a first power supply (4) and a second power supply (5); wherein the content of the first and second substances,
one end of the frequency converter (1) is connected with the first slurry circulating pump (2) or the second slurry circulating pump (3), and the other end of the frequency converter is connected with the first power supply (4) or the second power supply (5);
the first slurry circulating pump (2) is connected with a first power supply (4) through a frequency converter (1) or is directly connected with the first power supply (4);
and the second slurry circulating pump (3) is connected with a second power supply (5) through a frequency converter (1) or is directly connected with the second power supply (5).
2. A frequency converter-one-driven-two slurry circulation system according to claim 1, characterized in that the circuit connecting the frequency converter (1) with the first power source (4) is provided with a first switch (8).
3. A frequency converter-one-driven-two slurry circulation system according to claim 2, characterized in that the circuit connecting the frequency converter (1) with the second power source (5) is provided with a second switch (9).
4. A frequency converter one-drive-two slurry circulation system according to claim 2, characterized in that the output of the first power source (4) is provided with a first circuit breaker (6).
5. A frequency converter one-drive-two slurry circulation system according to claim 4, characterized in that the output of the second power source (5) is provided with a second circuit breaker (7).
6. A frequency converter one-driving-two slurry circulation system according to claim 1, characterized in that a first duplex switch (10) is arranged on a circuit connecting the first slurry circulation pump (2) with the frequency converter (1) and the first power supply (4).
7. A frequency converter one-drive-two slurry circulation system according to claim 6, characterized in that the circuit of the second slurry circulation pump (3) connected to the frequency converter (1) and the second power supply (5) is provided with a second duplex switch (11).
8. The one-driving-two slurry circulation system of the frequency converter according to claim 1, wherein the two slurry circulation pumps respectively form a slurry circulation pipeline together with the filter screen, the valve, the spraying layer and the nozzles and the inlet and outlet pipelines thereof.
9. A frequency converter one-drive-two slurry circulation system according to claim 1 or 8, wherein there is a minimum frequency conversion value for the speed control of each slurry circulation pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921021415.1U CN210303155U (en) | 2019-07-03 | 2019-07-03 | One-to-two slurry circulating system of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921021415.1U CN210303155U (en) | 2019-07-03 | 2019-07-03 | One-to-two slurry circulating system of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210303155U true CN210303155U (en) | 2020-04-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921021415.1U Active CN210303155U (en) | 2019-07-03 | 2019-07-03 | One-to-two slurry circulating system of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210303155U (en) |
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2019
- 2019-07-03 CN CN201921021415.1U patent/CN210303155U/en active Active
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