CN103423183A - Thermal power plant fan optimal configuration system and thermal power plant fan optimal configuration method - Google Patents
Thermal power plant fan optimal configuration system and thermal power plant fan optimal configuration method Download PDFInfo
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- CN103423183A CN103423183A CN2013103029280A CN201310302928A CN103423183A CN 103423183 A CN103423183 A CN 103423183A CN 2013103029280 A CN2013103029280 A CN 2013103029280A CN 201310302928 A CN201310302928 A CN 201310302928A CN 103423183 A CN103423183 A CN 103423183A
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Abstract
The invention discloses a thermal power plant fan optimal configuration system which comprises a first suction fan, a second suction fan, a first booster fan, a second booster fan and a desulfurizer, wherein the first suction fan and the second suction fan are arranged in parallel, the first booster fan and the second booster fan are arranged in parallel and connected with the first suction fan and the second suction fan respectively, and the desulfurizer is connected with the first booster fan and the second booster fan. The thermal power plant fan optical configuration system is characterized by further comprising entrances, exists and a booster fan bypass flue, wherein the entrances and the exits are connected to the two sides of the first booster fan and the second booster fan, and the booster fan bypass flue can be opened or closed and is connected with the first booster fan and the second booster fan in parallel. By halting and removing the corresponding suction fans or the booster fans in the underload situation, the aims of saving energy and reducing consumption are achieved.
Description
Technical field
The present invention relates to a kind of blower fan Optimizing Configuration System and using method thereof, belong to the thermal power generation field.
Background technique
China is one and take the country that coal is main energy sources, and wherein, the consumption of steam coal for power accounts for 61% left and right of national coal consumption amount.The direct result of coal consumption is a large amount of discharges of SO2 gas.In order to curb environmental pollution, reduce the discharge of sulfur dioxide, country has put into effect a series of rules, promotes control and the improvement of Thermal Power Enterprises to sulfur dioxide.The Chinese large-sized Thermal Power Enterprises has all been installed desulphurization system at present, from current desulfur technology, except the desulfuration in furnace of circulating fluidized-bed boiler, mainly contain humidification method after limestone (lime)-gypsum wet, in-furnace calcium spraying-stove, lime circulation dry method, seawater method, ammonia process, electronic beam method, flue gas wet method, moisture film wet method etc., wherein use the most extensive with smoke-gas wet desulfurization.The smoke-gas wet desulfurization system layout is after flue end, deduster, and capital equipment has booster fan, desulphurization reactor, oxidation fan, slurry mixer etc., has the advantages that desulphurization reaction speed is fast, efficiency is high, the sulfur-removing additives utilization ratio is high.
At present, the unit common configuration of thermal power plant desulphurization system, corresponding conventional fan configuration and method are as follows: the high-temperature flue gas that boiler produces is after air preheater and deduster, by two suction fan suctions that are set up in parallel, enter two booster fans that are set up in parallel, thereafter, enter desulfurizer and carry out desulfurization, finally by stack emission.Some power plant also are provided with the desulphurization system bypass, when desulphurization system breaks down, can it be excised by opening the desulphurization system bypass.
But this traditional blower fan configuration and method, when the unit low load stage, two suction fans and two booster fans still put into operation simultaneously, and now, booster fan and suction fan all can the off-target operating conditionss, and empty load of motor energy consumption accounting increases, the operational efficiency of blower fan own reduces, blower fan Q-H performance curve as shown in Figure 2 can see that now the efficiency of blower fan operation point is lower, therefore total power consumption is larger, station service power consumption rate is relatively high.If consider, at low-load, utilize the suction fan surplus of exerting oneself to overcome the resistance of desulphurization system, one or more booster fan of stopping using, though can reduce station service power consumption rate, but can bring another problem " stall of suction fan ", along with unit load reduces, flue gas flow reduces, and now the real work point of blower fan can embody skew left on blower fan Q-H performance curve, enter the fan stall district, this operation to equipment and system brings very big unsafe problems.
Therefore, those skilled in the art is devoted to develop the system and method that a kind of blower fan is distributed rationally, under the unit low-load, avoids under the prerequisite of blower fan generation stall, reduces the system operation energy consumption, realizes energy-saving and cost-reducing purpose.
Summary of the invention
For achieving the above object, the invention provides a kind of blower fan Optimizing Configuration System, described system comprises the first suction fan and the second suction fan be arranged in parallel, the first booster fan be arranged in parallel and the second booster fan that with described the first suction fan, with the second suction fan, are connected respectively, the desulfurizer be connected with described the first and second booster fans.It is characterized in that, described system also comprises the entrance and exit that connects described the first and second booster fan both sides, and the booster fan bypass of opening or closing in parallel with described the first and second booster fans.
System of the present invention also comprises the desulfurization bypass that connects described the first and second suction fan outlets and the outlet of described desulfurizer, and wherein said booster fan bypass and described desulfurization bypass comprise the baffle plate of opening or closing be arranged on wherein respectively.
Further, the left and right sides of the first booster fan and the second booster fan also is respectively equipped with inlet baffle, and outlet damper.The present invention also is included in air preheater and the deduster set gradually between the suction fan that boiler and Liang Tai be set up in parallel.
The invention also discloses a kind of using method of system as above, comprising system, there is no the desulfurization bypass and there are two kinds of situations of desulfurization bypass.
When unit load, during higher than first threshold, two suction fans and two booster fans move simultaneously, and inlet baffle and the outlet damper of two booster fans are all opened, the flapper closure of booster fan bypass, as have the desulfurization bypass, the desulfurization by-pass damper is also closed.Keep suction fan, the booster fan of both sides to move simultaneously.Flue gas after air preheater and deduster, by two suction fans and two booster fans, thereafter to desulfurizer, finally enters chimney;
When unit load during less than or equal to first threshold, inactive described the first suction fan, described the first booster fan, or stop using described the second suction fan, described the second booster fan, the flapper closure of booster fan bypass, as have the desulfurization bypass, the desulfurization by-pass damper is also closed.Keep one-sided suction fan, booster fan operation.Flue gas after air preheater and deduster, by one-sided suction fan and booster fan, thereafter to desulfurizer, finally enters chimney; Now, due to one-sided suction fan, booster fan operation, the flow of blower fan of being equivalent to make to flow through reaches 2 times under the fan operation mode of both sides, therefore the blower fan operation point as shown in Figure 3, efficiency is relatively low, but due to a suction fan and the booster fan of having stopped using, thereby total fan energy consumption reduces.
When unit load, during lower than Second Threshold, wherein Second Threshold is lower than first threshold, and stop using the first suction fan or the second suction fan, and two booster fans of stopping using, open the baffle plate of booster fan bypass, as have the desulfurization bypass, and the desulfurization by-pass damper is closed.Keep the operation of separate unit suction fan.Flue gas after air preheater and deduster is by the separate unit suction fan and enter the booster fan bypass, thereafter to desulfurizer, finally enters chimney; Now, due to the operation of separate unit suction fan, the flow of suction fan of being equivalent to make to flow through reaches 2 times under two suction fan methods of operation, and the booster fan of having stopped using, promoted the pressure head of suction fan, therefore the blower fan operation point as shown in Figure 4, fan operation efficiency improves relatively, and stopped using a suction fan and two booster fans, thereby total fan energy consumption reduces greatly.
The inlet baffle of considering the booster fan in the situation that booster fan is stopped transport can produce corrosion to fan blade and support etc. in opening state for a long time, therefore, preferably, in the situation that single suction fan operation, remain that the outlet damper of one of them booster fan is in less opening state, give the certain flue gas through-current capability of booster fan, prevent corrosion, and, after booster fan bypass channel and the parallel connection of booster fan passage, the drag losses after both parallel connections is all the better little.
When unit load increases, take suction fan or the booster fan of method enabledisable contrary in above-mentioned steps.
Blower fan Optimizing Configuration System of the present invention and method can obtain following technique effect:
1, during the operation of one-sided suction fan, booster fan or during the single suction fan operation, owing to having reduced fan operation quantity, thereby can reduce total fan energy consumption.Especially when the single suction fan operation, because fan operation efficiency promotes relatively, the system resistance loss reduces, therefore total fan energy consumption is lower;
2, single induced draught fan operation is compared with two induced draught fan operations, and the situation down-off constant at pressure doubles, and, more away from stall line, works safer in the operation point of blower fan.
Technique effect below with reference to accompanying drawing to design of the present invention, concrete structure and generation is described further, to understand fully purpose of the present invention, feature and effect.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of blower fan Optimizing Configuration System of the present invention;
Fig. 2 is the performance curve of blower fan, and wherein abscissa is volume flow Q, and y coordinate is pressure head H.The operation point that the blower fan operation point is low-load under traditional method of operation.
Fig. 3 is the performance curve of blower fan, and wherein abscissa is volume flow Q, and y coordinate is pressure head H.The operation point that the blower fan operation point is low-load under the one-sided fan operation mode of the present invention.
Fig. 4 is the performance curve of blower fan, and wherein abscissa is volume flow Q, and y coordinate is pressure head H.The operation point that the blower fan operation point is low-load under single suction fan operation mode of the present invention.
Embodiment
The invention discloses a kind of thermal power plant blower fan Optimizing Configuration System, as shown in Figure 1, described system comprises the first suction fan 4a and the second suction fan 4b be arranged in parallel, the the first booster fan 6a be arranged in parallel and the second booster fan 6b that with described the first suction fan 4a, with the second suction fan 4b, are connected respectively, with described the first and second booster fan 6a, the desulfurizer 8 that 6b is connected, it is characterized in that, described system also comprises described the first and second booster fan 6a of connection, the entrance and exit of 6b both sides, and with described first, the second booster fan 6a, the booster fan bypass 9 of opening or closing of 6b parallel connection, wherein said booster fan bypass 9 comprises the baffle plate of opening or closing be arranged on wherein.
System of the present invention also comprises the desulfurization bypass 11 that connects described the first and second suction fan 4a, 4b outlet and the outlet of described desulfurizer, and wherein said desulfurization bypass comprises the baffle plate of opening or closing be arranged on wherein.
Further, the left and right sides of the first booster fan and the second booster fan also is respectively equipped with inlet baffle 5a, 5b, and outlet damper 7a, 7b.
Further, as shown in Figure 1, the present invention also comprises and is arranged on boiler 1 and two suction fan 4a, air preheater 2a, the 2b set gradually between 4b and deduster 3a, 3b, the high-temperature flue gas produced from boiler 1 is after air preheater 2a, 2b and deduster 3a, 3b, by two suction fan 4a, 4b that are set up in parallel, enter the first booster fan 6a and the second booster fan 6b that are set up in parallel after suction, two booster fans blast flue gas the desulfuration absorbing tower of desulfurizer 8, and the flue gas after desulfurization discharges by chimney 10 from desulfurizer 8.
The invention also discloses a kind of using method of system as above, comprising system, there is no the desulfurization bypass and there are two kinds of situations of desulfurization bypass.
When unit load during higher than first threshold, two suction fan 4a, 4b and two booster fan 7a, 7b move simultaneously, inlet baffle 5a, 5b and outlet damper 7a, the 7b of two booster fans open, the flapper closure of booster fan bypass 9, as have desulfurization bypass 11, the desulfurization by-pass damper is also closed.Keep suction fan 4a, 4b and booster fan 7a, the 7b of both sides to move simultaneously.Flue gas after air preheater 2a, 2b and deduster 3a, 3b, by two suction fan 4a, 4b and two booster fan 7a, 7b, thereafter to desulfurizer 8, finally enters chimney 10.
When unit load during less than or equal to first threshold, inactive described the first suction fan 4a, described the first booster fan 6a, or stop using described the second suction fan 4b, described the second booster fan 6b, the flapper closure of booster fan bypass 9, as have desulfurization bypass 11, the desulfurization by-pass damper is also closed.Keep one-sided suction fan, booster fan operation.Flue gas after air preheater and deduster, by one-sided suction fan and booster fan, thereafter to desulfurizer 8, finally enters chimney 10; Now, due to one-sided suction fan, booster fan operation, the flow of blower fan of being equivalent to make to flow through reaches 2 times under the fan operation mode of both sides, therefore the blower fan operation point as shown in Figure 3, efficiency is relatively low, but due to a suction fan and the booster fan of having stopped using, thereby total fan energy consumption reduces.
When unit load, during lower than Second Threshold, wherein Second Threshold is lower than first threshold, and the first suction fan 4a or the second suction fan 4b stop using, and stop using two booster fan 6a, 6b, open the baffle plate of booster fan bypass 9, as have desulfurization bypass 11, the desulfurization by-pass damper is closed.Keep the operation of separate unit suction fan.Flue gas after air preheater and deduster is by the separate unit suction fan and enter the booster fan bypass, thereafter to desulfurizer 8, finally enters chimney 10; Now, due to the operation of separate unit suction fan, the flow of suction fan of being equivalent to make to flow through reaches 2 times under two suction fan methods of operation, and the booster fan of having stopped using, promoted the pressure head of suction fan, therefore the blower fan operation point as shown in Figure 4, fan operation efficiency improves relatively, and stopped using a suction fan and two booster fans, thereby total fan energy consumption reduces greatly.
The entrance plate washer of considering the booster fan in the situation that booster fan is stopped transport can produce corrosion to fan blade and support etc. in opening state for a long time, therefore, preferably, in the situation that single suction fan operation, remain that the outlet plate washer of one of them booster fan is in less opening state, give the certain flue gas through-current capability of booster fan, prevent corrosion, and, after booster fan bypass channel and the parallel connection of booster fan passage, the drag losses after both parallel connections is all the better little.
When unit load increases, take suction fan or the booster fan of method enabledisable contrary in above-mentioned steps.
Take certain gigawatt unit is calculated as example, and unit adopts the method for operation after optimizing, i.e. single suction fan operation mode when halfload.
Blower fan is distributed front and back Operational Limits contrast table rationally
| Project | Double suction fan+bis-booster fan operations | The single suction fan operation |
| Unit actual motion load (MW) | 500 | 500 |
| Suction fan A electric current | 111.9 | 187.7 |
| Suction fan B electric current | 112.3 | 0 |
| Booster fan A electric current | 87.9 | 0 |
| Booster fan B electric current | 87.9 | 0 |
| Total output (MW) | 4.6 | 2.84 |
Upper table is under the half capacity operation operating mode, power of fan after employing single suction fan operation changes, save power 1.76MW after contrasting the mode that shows the operation of unit employing separate unit suction fan, because the power of blower fan is saved and is embodied directly in the minimizing of station service power consumption rate, the unit load rate 50% and below 40% left and right that accounts for the whole year operation time working time, the annual total run time of unit is about 6500 hours, and total saving of separate unit 1000MW unit year station service use amount is: 6500 * 0.4 * 1760=4.576 * 10
6KWh.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that related domain just can design according to the present invention be made many modifications and variations without creative work.Therefore, all technician in the art, all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technological scheme of logical analysis, reasoning, or a limited experiment.
Claims (11)
1. thermal power plant's blower fan Optimizing Configuration System, comprise the first suction fan and the second suction fan that are arranged in parallel, the first booster fan be arranged in parallel and the second booster fan that with described the first suction fan, with the second suction fan, are connected respectively, the desulfurizer be connected with described the first and second booster fans, it is characterized in that, described system also comprises the entrance and exit that is connected to described the first and second booster fan both sides, and the booster fan bypass flue opening or close in parallel with described the first and second booster fans.
2. the system as claimed in claim 1, wherein, described booster fan bypass flue comprises the setting baffle plate of opening or closing wherein.
3. system as claimed in claim 2, wherein, the left and right sides of described the first booster fan and the second booster fan also is respectively equipped with inlet baffle, and outlet damper, and wherein said booster fan bypass is connected to the outlet of the entrance and exit baffle plate of described inlet baffle.
4. system as claimed in claim 3, also be included in boiler and the first and second suction fans of being set up in parallel between the air preheater and the deduster that set gradually.
5. require 2 described systems as the right item, also comprise the desulfurization bypass that connects described the first and second suction fan outlets and the outlet of described desulfurizer, wherein, described desulfurization bypass comprises the setting baffle plate of opening or closing wherein.
6. the using method of a system as claimed in claim 2 comprises step a:
When unit load higher than first threshold the time, move described the first suction fan, the second suction fan, the first booster fan and the second booster fan simultaneously, open described outlet and the inlet baffle of described the first booster fan and the second booster fan, close the baffle plate of described booster fan bypass.
7. method as claimed in claim 6 comprises step b:
When unit load less than or equal to first threshold the time, stop using described the first suction fan and described the first booster fan, or stop using described the second suction fan and described the second booster fan, the flapper closure of described booster fan bypass.
8. method as claimed in claim 7 comprises step c:
When unit load, during lower than Second Threshold, wherein Second Threshold is lower than first threshold, and stop using described the first suction fan or described the second suction fan, and described the first and second booster fans of stopping using, open the baffle plate of described booster fan bypass.
9. the using method of a system as claimed in claim 5 comprises step a ':
When unit load higher than first threshold the time, move described the first suction fan simultaneously, the second suction fan, the first booster fan and the second booster fan, open described outlet and the inlet baffle of described the first booster fan and the second booster fan, close the baffle plate of described booster fan bypass and the baffle plate of described desulfurization bypass.
10. method as claimed in claim 9 comprises step b ':
When unit load less than or equal to first threshold the time, inactive described the first suction fan and described the first booster fan, or stop using described the second suction fan and described the second booster fan, the baffle plate of the baffle plate of described booster fan bypass and described desulfurization bypass is all closed.
11. method as claimed in claim 10 comprises step c ':
When unit load during lower than Second Threshold, wherein Second Threshold is lower than first threshold, stop using described the first suction fan or described the second suction fan, and described the first and second booster fans of stopping using, open the baffle plate of described booster fan bypass, close the baffle plate of described desulfurization bypass.
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| CN107166427A (en) * | 2017-06-23 | 2017-09-15 | 辽宁东科电力有限公司 | A kind of fired power generating unit pressure fan automatically controls optimization method |
| CN110186067A (en) * | 2019-05-08 | 2019-08-30 | 国网浙江省电力有限公司电力科学研究院 | A kind of cigarette air duct coupled system preventing fan stall |
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| CN110186067A (en) * | 2019-05-08 | 2019-08-30 | 国网浙江省电力有限公司电力科学研究院 | A kind of cigarette air duct coupled system preventing fan stall |
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Application publication date: 20131204 |