CN103480264B - Flue gas system and control method thereof - Google Patents
Flue gas system and control method thereof Download PDFInfo
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- CN103480264B CN103480264B CN201310401369.9A CN201310401369A CN103480264B CN 103480264 B CN103480264 B CN 103480264B CN 201310401369 A CN201310401369 A CN 201310401369A CN 103480264 B CN103480264 B CN 103480264B
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Abstract
The invention provides a flue gas system. The flue gas system comprises electrostatic dust collectors, combination fans, a wet desulfurization device and a flue gas exhaust device, wherein the electrostatic dust collectors are used for receiving flue gases and separating and gathering dust particles in the flue gases; the combination fans are used for transferring the flue gases subjected to dust collection treatment and are provided with regulating units; the regulating units are used for controlling output powers of the combination fans according to the resistance to the flue gases in a transfer process; the wet desulfurization device comprises a plurality of slurry circulating pumps and an absorption tower containing slurry; the slurry circulating pumps are installed in the absorption tower; an inlet of the absorption tower is connected with the combination fans and is used for receiving the flue gases transferred by the combination fans to carry out desulfurization treatment on the flue gases; the flue gas exhaust device is used for exhausting the flue gases subjected to desulfurization treatment. The flue gas system has the beneficial effects that the output powers of the combination fans are controlled according to the resistance to the flue gases in the transfer process; therefore the regulated objects are single and the combination fans can quickly and accurately provide required conveying forces to maintain pressure balance of the flue gas system to prevent explosion, thus improving the safety. The invention also provides a control method of the flue gas system.
Description
Technical field
The present invention relates to Flue Gas Desulfurization Engineering in Power Plant technical field, particularly relate to a kind of flue gas system and control method thereof.
Background technology
Along with the development of thermal power plant pollutant Prevention Technique, for reaching the requirement of national environmental protection, large-size thermal power plant need build flue gas desulfur device usually, the flue gas that boiler combustion produces is extracted out through air-introduced machine, after carrying out desulfurization process by flue gas desulfur device, then by flue gas exhausts in air.For overcoming the resistance of desulfurizer, generally also need to arrange booster fan.
At present, air-introduced machine is generally used for controlling furnace pressure, booster fan is used for controlling booster fan inlet pressure, due to from boiler export to the pepeline characteristic of the whole flue gas system of flue gas discharger, it is poor to there is the regular hour in furnace pressure change and the change of booster fan inlet pressure, when flue gas flow significantly change, the bad working environments such as unit load change time, two kinds of blower fans of series connection need be regulated simultaneously, regulate complexity and delay of response, whole flue gas system imbalance of pressure is caused to be blasted, poor stability.
Summary of the invention
Based on this, be necessary to blast for whole flue gas system imbalance of pressure, the problem of poor stability, provides a kind of flue gas system and control method thereof.
A kind of flue gas system, comprising:
The electrostatic precipitator be connected with boiler, receives the flue gas provided by described boiler, is separated and traps the grit in described flue gas;
Associating blower fan, is connected with described electrostatic precipitator, transmits the flue gas through dust removal process, and described associating blower fan is provided with regulon, combines the power output of blower fan described in the draught control that described regulon is subject to according to described flue gas in transport process;
Wet desulphurization device, comprise multiple slurry circulating pump and the absorption tower being contained with slurries, described slurry circulating pump is installed in described absorption tower, described absorption tower entrance is connected with described associating blower fan, described absorption tower entrance receives the flue gas that described associating blower fan transmits, and makes slurries at described absorption tower Inner eycle to carry out desulfurization process to flue gas by described slurry circulating pump;
Flue gas discharger, exports with described absorption tower and is connected, discharge the flue gas after desulfurization process.
Wherein in an embodiment, comprise the first processing module and the second processing module, described first processing module and described second processing module respectively with described boiler, combine blower fan and wet desulphurization device is connected;
Described first processing module comprises the first detecting unit and the first control unit, when described slurry circulating pump all quits work, described first detecting unit detects and judges whether exit, described absorption tower cigarette temperature is greater than first threshold, if so, described boiler trip is controlled after described first control unit time delay first time period;
Described second processing module comprises the second detecting unit and the second control unit, when described slurry circulating pump is in running status, described second detecting unit detects and judges whether described associating blower fan exit cigarette temperature is greater than Second Threshold, if so, described boiler trip is controlled after described second control unit time delay second time period.
Wherein in an embodiment, also comprise the 3rd processing module, be provided with the pressure fan of supply described boiler oil burning required air in described boiler and be positioned at the air preheater of described boiler tail, described 3rd processing module is connected with described boiler and described associating blower fan respectively;
Described 3rd processing module comprises the 3rd detecting unit and the 3rd control unit, when after described boiler trip, described 3rd control unit pressure fan described in control section and the described associating blower fan of part after time delay the 3rd time period quit work, described 3rd detecting unit detects and judges whether described air preheater inlet flue gas temperature is less than the 3rd threshold value, if, described 3rd control unit then controls to combine blower fan described in pressure fan described in another part and another part and quits work, and controls described associating wind motor leaf and import and export door to be in opening.
Wherein in an embodiment, comprise alert process module, be connected with described slurry circulating pump, described alert process module comprises alarm detecting unit and alarm control unit, described alarm detecting unit detects and judges whether to only have a described slurry circulating pump to be in running status, if so, described alarm control unit controls to send alarm signal.
Wherein in an embodiment, described wet desulphurization device also comprises flue gas heat-exchange unit, described flue gas heat-exchange unit comprises flue gas cool-down parts and flue gas intensification parts, described flue gas cool-down parts are between described associating blower fan and described absorption tower entrance, described flue gas intensification parts are between the outlet of described absorption tower and described flue gas discharger, described flue gas heat-exchange unit and described alert process model calling, described alarm detecting unit detects and judges whether the mair motor of described flue gas heat-exchange unit and auxiliary motor all quit work, if, described alarm control unit controls to send alarm signal.
A kind of flue gas system control method, comprises the following steps:
Receive flue gas, be separated and trap the grit in described flue gas;
Transmit the flue gas through dust removal process, and transmit the carrying capacity of flue gas according to the draught control that described flue gas is subject in transport process;
Receive described flue gas, and by serum recycle, desulfurization process is carried out to described flue gas;
The flue gas of discharge after desulfurization process.
Wherein in an embodiment, described reception flue gas, is separated and after trapping the step of the grit in described flue gas, comprises the following steps:
When slurries stop circulation time, detect and judge whether the cigarette temperature at the flue gas desulfurization place of completing is greater than first threshold, stopping after if so, time delay first time period producing flue gas;
When slurries are in recurrent state, detect and judge whether the cigarette temperature of flue gas desulfurization porch is greater than Second Threshold, if so, stopping after time delay second time period producing flue gas.
Wherein in an embodiment, described stopping comprises the following steps after producing flue gas:
Reduce the carrying capacity transmitting described flue gas after time delay the 3rd time period, detect and judge whether the cigarette temperature of flue gas generation place is less than the 3rd threshold value, if so, control to stop providing the carrying capacity transmitting described flue gas, and keep described exhaust gases passes unobstructed.
Wherein in an embodiment, the described flue gas of described reception, and by serum recycle, described flue gas is carried out to the step of desulfurization process, specifically comprise:
Receive described flue gas, and cooling process is carried out to flue gas;
Loop slurry is to carry out desulfurization process to the flue gas through cooling process;
Heat up through the flue gas of desulfurization process.
Wherein in an embodiment, described stopping comprises the following steps before producing flue gas:
Detect and judge whether to only have a slurry circulating pump to be in running status, if so, sending alarm signal;
Detect and judge whether described flue gas carried out cooling process and carry out hyperthermic treatment after desulfurization process before desulfurization process, if not, sent alarm signal.
Above-mentioned flue gas system and control method thereof, flue gas is transmitted by arranging associating blower fan, associating blower fan is provided with regulon, regulon can according to the power output of the draught control associating blower fan suffered in transport process of flue gas, provides enough carrying capacity to overcome flue gas resistance suffered in transport process to combine blower fan.So, controlled plant is single, when there is the bad working environments such as flue gas flow significantly changes, unit load change, associated wind machine can provide required carrying capacity rapidly, accurately, to maintain flue gas system pressure balance preventing blast, improve the security of use, and structure is simple, cost is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of flue gas system;
Fig. 2 is the schematic flow sheet of flue gas system control method;
Fig. 3 is the schematic flow sheet of the flue gas desulfurization process of flue gas system control method.
Detailed description of the invention
As shown in Figure 1, a kind of flue gas system, comprise be connected with boiler 110 electrostatic precipitator 120, combine blower fan 130, wet desulphurization device 140 and flue gas discharger 150.
Electrostatic precipitator 120, is connected with boiler 110, receives the flue gas provided by boiler 110, is separated and traps the grit in flue gas.Wherein, boiler 110 holds and combustion fuel, produces flue gas.Boiler 110 is the heat energy or other energy heats water or other working medium that utilize fuel combustion to discharge, to produce the equipment of the steam of regulation parameter (temperature, pressure) and quality, hot water or other working medium.Electrostatic precipitator 120 utilizes highfield to make dust particles, and the device under the effect of electrostatic field, grit being separated, trapping.
Associating blower fan 130, is connected with electrostatic precipitator 120, transmits the flue gas through dust removal process, and associating blower fan 130 is provided with regulon, and regulon combines the power output of blower fan 130 according to the draught control suffered by flue gas is in transport process.This associating blower fan 130 mainly overcomes the resistance of wet desulphurization device 140, flue gas is sent to absorption tower 142, and stablizes boiler 110 outlet pressure.
Wet desulphurization device 140, comprise multiple slurry circulating pump and the absorption tower 142 being contained with slurries, slurry circulating pump is installed in absorption tower 142, absorption tower 142 entrance is connected with associating blower fan 130, absorption tower 142 entrance receives the flue gas that associating blower fan 130 transmits, and makes slurries at absorption tower 142 Inner eycle to carry out desulfurization process to flue gas by serum recycle pumping action.Slurry circulating pump can make the slurries in absorption tower 142 constantly circulate, thus the sulfur dioxide in flue gas is absorbed completely.
Flue gas discharger 150, exports with described absorption tower 142 and is connected, discharge the flue gas after desulfurization process.Flue gas discharger 150 can be chimney.
Above-mentioned flue gas system, electrostatic precipitator 120 is connected with boiler 110, the flue gas provided by boiler 110 is provided, be separated and trap the grit in this flue gas, flue gas through dust removal process is sent to absorption tower 142 by combining blower fan 130 effect, and making slurries at absorption tower 142 Inner eycle to carry out desulfurization process to flue gas by slurry circulating pump, the flue gas after desulfurization process is disposed to air through flue gas discharger 150 again.Flue gas is transmitted by arranging associating blower fan 130, associating blower fan 130 is provided with regulon, regulon, according to the power output of the draught control associating blower fan 130 suffered in transport process of flue gas, provides enough carrying capacity to overcome flue gas resistance suffered in transport process to combine blower fan.So, controlled plant is single, when there is the bad working environments such as flue gas flow significantly changes, unit load change, associating blower fan 130 can provide required carrying capacity rapidly, accurately, to maintain flue gas system pressure balance preventing blast, improve the security of use, and structure is simple, cost is low.
Refer to Fig. 1, wherein in an embodiment, flue gas system comprises the first processing module and the second processing module, the first processing module and the second processing module respectively with boiler 110, combine blower fan 130 and wet desulphurization device 140 is connected.First processing module comprises the first detecting unit and the first control unit, and the first detecting unit is connected with the first control unit.Particularly, the first detecting unit can be connected with slurry circulating pump and absorption tower 142 respectively, and the first control unit is connected with boiler 110.When slurry circulating pump all quits work, the first detecting unit detects and judges whether exit, absorption tower 142 cigarette temperature is greater than first threshold, if so, controls boiler 110 after the first control unit time delay first time period and trips.Because of slurry circulating pump all quit work time, slurries in absorption tower 142 can not at tower internal circulation flow, absorption tower 142 inwall does not reduce with the temperature resistant capability of slurry liquid contacts part, be usually located near exit, absorption tower 142, stop producing flue gas by controlling boiler 110 tripping operation, thus the exhaust gas volumn entering absorption tower 142 reduces, and avoids because temperature in absorption tower 142 is too high and blasts, improve the security of use.Wherein, just control boiler 110 after time delay first time period to trip, to guarantee that exit, absorption tower 142 cigarette temperature is greater than the accuracy of first threshold really, prevent exit, absorption tower 142 cigarette temperature to be just greater than first threshold instantaneously and cause boiler 110 to trip phenomenon occur, improve use stability.First time period and first threshold all can set according to absorption tower 142 heatproof intensity.Specific in the present embodiment, first time period is 15 seconds, and first threshold is 75 degrees Celsius.
Second processing module comprises the second detecting unit and the second control unit, and the second detecting unit is connected with the second control unit.Particularly, the second detecting unit can respectively with slurry circulating pump with combine blower fan 130 and be connected, and the second control unit can be connected with boiler 110.When slurry circulating pump is in running status, the second detecting unit detects and judges whether associating blower fan 130 exit cigarette temperature is greater than Second Threshold, if so, controls boiler 110 after the second control unit time delay second time period and trips.Because of slurry circulating pump in running order time, flue gas is delivered in absorption tower 142 through associating blower fan 130, stop producing flue gas by controlling boiler 110 tripping operation, thus the exhaust gas volumn entering absorption tower 142 reduces, avoiding reason to combine blower fan 130 exit, to enter flue gas cigarette temperature in absorption tower 142 too high and cause imbalance of pressure to be blasted, and improves the security of use.Wherein, just control boiler 110 after time delay second time period and trip, its object is identical with first time period, does not repeat them here.Second time period and Second Threshold all can set according to absorption tower 142 heatproof intensity.Specific in the present embodiment, the second time period was 180 seconds, and Second Threshold is 190 degrees Celsius.
Refer to Fig. 1, wherein in an embodiment, flue gas system also comprises the 3rd processing module, the pressure fan being provided with supply boiler 110 fuel combustion required air in boiler 110 and air preheater the 112, three processing module being positioned at boiler 110 afterbody are respectively with boiler 110 with combine blower fan 130 and be connected.3rd processing module comprises the 3rd detecting unit and the 3rd control unit, and the 3rd detecting unit is connected with the 3rd control unit.Particularly, the 3rd detecting unit can be connected with air preheater, and the 3rd control unit and can be combined blower fan and is connected with pressure fan.After boiler 110 trips, 3rd control unit control section pressure fan and part combination blower fan 130 after time delay the 3rd time period quit work, 3rd detecting unit detects and judges whether air preheater 112 inlet flue gas temperature is less than the 3rd threshold value, if, 3rd control unit then controls another part pressure fan and another part associating blower fan 130 quits work, and control associating blower fan 130 movable vane and import and export door to be in opening.So, after boiler 110 trips, namely boiler 110 fuel that do not burn away stop producing new flue gas, therefore control section pressure fan and part combination blower fan 130 quit work, also can ensure to transmit remaining exhaust gas volumn and save electricity, when detecting that air preheater 112 inlet flue gas temperature is less than the 3rd threshold value, flue gas basic handling now in flue is complete, control another part pressure fan and another part associating blower fan 130 quit work, and control associating blower fan 130 movable vane and import and export door to be in opening, to keep flue unobstructed.Control the duty of each pressure fan and associating blower fan 130 according to flue gas flow change, ensure flue gas system pressure balance, improve security and economy.Wherein, the 3rd time period can determine according to the flue gas flow of flue gas system.Specific in the present embodiment, the 3rd time period was 5 minutes, and the 3rd threshold value is 205 degrees Celsius.
Refer to Fig. 1, air preheater 112 is positioned at boiler 110 afterbody, utilizes the heat heating fuel of boiler 110 tail flue gas to burn required air to improve boiler 110 efficiency.Specific in the present embodiment, each boiler 110 of flue gas system is provided with two air preheaters 112, and electrostatic precipitator 120 and associating blower fan 130 are also two, an air preheater 112, electrostatic precipitator 120 is connected successively with an associating blower fan 130, form the exhaust gases passes of two groups of parallel connections, to keep flue unobstructed, flue gas system pressure balance.
Refer to Fig. 1, wherein in an embodiment, flue gas system comprises alert process module, be connected with slurry circulating pump, alert process module comprises alarm detecting unit and alarm control unit, and alarm detecting unit is connected with alarm control unit, and alarm detecting unit detects and judges whether to only have a slurry circulating pump to be in running status, if so, alarm control unit controls to send alarm signal.So, by arranging alert process module, sending alarm signal when only having a slurry circulating pump to be in running status, to remind staff's checkout facility whether to have the situations such as fault to occur, shifting to an earlier date the accidents such as pre-blast protection, improve security.
Refer to Fig. 1, wherein in an embodiment, wet desulphurization device 140 also comprises flue gas heat-exchange unit 144, flue gas heat-exchange unit 144 comprises flue gas cool-down parts and flue gas intensification parts, flue gas cool-down parts are between associating blower fan 130 and absorption tower 142 entrance, flue gas intensification parts export between flue gas discharger 150 on absorption tower 142, flue gas heat-exchange unit 144 and alert process model calling, alarm detecting unit detects and judges whether the mair motor of flue gas heat-exchange unit 144 and auxiliary motor all quit work, if so, alarm control unit controls to send alarm signal.
So, by arranging flue gas heat-exchange unit 144, the flue-gas temperature entering absorption tower 142 is reduced by flue gas cool-down parts, to reduce in absorption tower 142 corrosion-resistant process specifications, by flue gas intensification parts, the neat stress after desulfurization process is heated, make exhaust gas temperature reach on dew point, alleviate the corrosion to flue and flue gas discharger 150, be convenient to fume emission.By flue gas heat-exchange unit 144 and alert process model calling, when the mair motor of flue gas heat-exchange unit 144 and auxiliary motor all quit work, send alarm signal, to remind staff's flue gas heat-exchange unit 144 to break down, be convenient to staff and process in time, reliability is high.
As depicted in figs. 1 and 2, a kind of flue gas system control method, comprises the following steps:
Step S110, receives flue gas, is separated and traps the grit in described flue gas.Particularly, by adopt boiler 110, hold in boiler 110 and combustion fuel to produce flue gas, electrostatic precipitator 120 is connected with boiler 110, receives the flue gas provided by boiler 110, is separated and traps the grit in flue gas.Wherein, boiler 110 is the heat energy or other energy heats water or other working medium that utilize fuel combustion to discharge, to produce the equipment of the steam of regulation parameter (temperature, pressure) and quality, hot water or other working medium.Electrostatic precipitator 120 utilizes highfield to make dust particles, and the device under the effect of electrostatic field, grit being separated, trapping.
Step S120, transmits the flue gas through dust removal process, and transmits the carrying capacity of flue gas according to the draught control that described flue gas is subject in transport process.Particularly, associating blower fan 130 can be adopted to transmit flue gas through dust removal process, associating blower fan 130 is provided with regulon, regulon according to the power output of the draught control associating blower fan 130 suffered in transport process of flue gas, to provide the carrying capacity needed for enough transmission flue gas.This associating blower fan 130 mainly overcomes the resistance of wet desulphurization device 140, flue gas is sent to absorption tower 142, and stablizes boiler 110 outlet pressure.
Step S130, receives described flue gas, and carries out desulfurization process by slurry circulating pump to flue gas.Particularly, wet desulphurization device 140 can be adopted, this wet desulphurization device 140 comprises multiple slurry circulating pump and is contained with the absorption tower 142 of slurries, slurry circulating pump is installed in absorption tower 142, absorption tower 142 entrance is connected with associating blower fan 130, absorption tower 142 entrance receives the flue gas that associating blower fan 130 transmits, and makes slurries at absorption tower 142 Inner eycle to carry out desulfurization process to flue gas by slurry circulating pump.Slurry circulating pump can make the slurries in absorption tower 142 constantly circulate, thus the sulfur dioxide in flue gas is absorbed completely.
Step S140, discharges the flue gas after desulfurization process.Connecting flue gas discharger 150 as exported on absorption tower 142, discharging the flue gas after desulfurization process.Flue gas discharger 150 can be chimney.
The control method of above-mentioned flue gas system, receive flue gas, be separated and trap the grit in this flue gas, transmit the flue gas through dust removal process, and the carrying capacity of flue gas is transmitted according to the draught control that flue gas is subject in transport process, receive flue gas, and by serum recycle, desulfurization process is carried out to flue gas, discharge the flue gas after desulfurization process to air.So, the resistance suffered in transport process according to flue gas provides enough carrying capacitys, controlled plant is single, so that when there is the bad working environments such as flue gas flow significantly changes, unit load change, required carrying capacity can be provided rapidly, accurately, maintain flue gas system pressure balance and prevent blast, improve the security of use, cost is low.
Refer to Fig. 2, wherein in an embodiment, step S110 receives flue gas, is separated and after trapping the step of the grit in described flue gas, comprises the following steps:
Step S150, when slurries stop circulation time, detects and judges whether the cigarette temperature at the flue gas desulfurization place of completing is greater than first threshold, stops producing flue gas after if so, time delay first time period.Serum recycle completes by slurry circulating pump, when slurries stop circulation, when namely slurry circulating pump all quits work, slurries in absorption tower 142 can not at tower internal circulation flow, absorption tower 142 inwall does not reduce with the temperature resistant capability of slurry liquid contacts part, be usually located near exit, absorption tower 142, the flue gas desulfurization place of completing is exit, absorption tower namely, namely control boiler 110 by stopping generation flue gas to trip, thus the exhaust gas volumn entering absorption tower 142 reduces, avoid because temperature in absorption tower 142 is too high and blast, improve the security of use.Wherein, just stop after time delay first time period producing flue gas, to guarantee that the flue gas desulfurization place of completing cigarette temperature is greater than the accuracy of first threshold really, the phenomenon preventing the flue gas desulfurization place of completing cigarette temperature to be just greater than first threshold instantaneously occurs, and improves the stability used.First time period and first threshold all can set according to absorption tower 142 heatproof intensity.Specific in the present embodiment, first time period is 15 seconds, and first threshold is 75 degrees Celsius.
Step S160, when slurries are in recurrent state, detect and judges whether the cigarette temperature of flue gas desulfurization porch is greater than Second Threshold, if so, stops after time delay second time period producing flue gas.When slurries are in recurrent state, when namely slurry circulating pump is in running status, flue gas is delivered in absorption tower 142 through associating blower fan 130, namely control boiler 110 by stopping generation flue gas to trip, thus the exhaust gas volumn entering absorption tower 142 reduces, avoid flue gas desulfurization porch namely to combine the flue gas cigarette temperature in blower fan 130 exit too high, and the too high imbalance of pressure that causes of temperature in absorption tower 142 is blasted, improve the security of use.Wherein, just control boiler 110 after time delay second time period and trip, its effect is identical with first time period, does not repeat them here.Second time period and Second Threshold all can set according to absorption tower 142 heatproof intensity.Specific in the present embodiment, the second time period was 180 seconds, and Second Threshold is 190 degrees Celsius.
Refer to Fig. 2, wherein in an embodiment, after step S150 stops producing flue gas or after step S160 stopping generation flue gas, comprise the following steps:
Step S170, reduces the carrying capacity transmitting described flue gas, detects and judge whether flue gas generation place cigarette temperature is less than the 3rd threshold value after time delay the 3rd time period, if so, control to stop providing the carrying capacity transmitting flue gas, and keeps exhaust gases passes unobstructed.So, after stopping produces flue gas, namely boiler 110 fuel that do not burn away stop producing new flue gas, now reduce the carrying capacity transmitting flue gas i.e. control section pressure fan and part combination blower fan 130 to quit work, transmit remaining exhaust gas volumn in guarantee and also save electricity simultaneously, when detecting that flue gas generation place cigarette temperature is less than the 3rd threshold value, flue gas basic handling now in flue is complete, control to stop providing the carrying capacity transmitting flue gas, and keep exhaust gases passes unobstructed, to keep flue gas system pressure balance.Control according to flue gas flow change the carrying capacity transmitting flue gas, ensure flue gas system pressure balance, improve security and economy.Wherein, the 3rd time period can determine according to the flue gas flow of flue gas system.Specific in the present embodiment, the 3rd time period was 5 minutes, and the 3rd threshold value is 205 degrees Celsius.
Refer to Fig. 3, wherein in an embodiment, step S130 receives flue gas, and by serum recycle, flue gas is carried out to the step of desulfurization process, specifically comprises:
Step S132, receives described flue gas, and carries out cooling process to flue gas.By arranging flue gas heat-exchange unit 144, flue gas heat-exchange unit 144 comprises flue gas cool-down parts, between associating blower fan 130 and absorption tower 142 entrance, reduced the flue-gas temperature entering absorption tower 142 by flue gas cool-down parts, to reduce in absorption tower 142 corrosion-resistant process specifications.
Step S134, loop slurry is to carry out desulfurization process to the flue gas through cooling process.
Step S136, heats up through the flue gas of desulfurization process.Flue gas heat-exchange unit 144 comprises flue gas intensification parts, export on absorption tower 142 between flue gas discharger 150, by flue gas intensification parts, the neat stress after desulfurization process is heated, exhaust gas temperature is made to reach on dew point, alleviate the corrosion to flue and flue gas discharger 150, be convenient to fume emission.
Refer to Fig. 2, wherein in an embodiment, described serum recycle carries out desulfurization process to flue gas and carries out desulfurization process specifically by slurry circulating pump loop slurry to flue gas, after step S150 stops producing flue gas or after step S160 stopping generation flue gas, comprises the following steps:
Step S180, when slurry circulating pump is multiple stage, detects that one of them slurry circulating pump is in running order, and described flue gas had and carries out cooling process before desulfurization process, has when carrying out hyperthermic treatment, control to produce flue gas after desulfurization process.Namely stop producing flue gas after boiler 110 trips, if when need restart boiler 110 equipment such as grade after Failure elimination, need first to reset to boiler 110.So, when meeting, one of them slurry circulating pump is in running order, and flue gas had before desulfurization process carry out cooling process, have after desulfurization process and carry out hyperthermic treatment, namely control the mair motor of the flue gas heat-exchange unit 144 of flue gas heating and cooling or auxiliary motor in running order time, boiler 110 can be controlled reset to continue to produce flue gas, when preventing boiler 110 from resetting in running order, wet desulphurization device 140 part is not carried out work and causes produced flue gas can not carry out desulfurization process, improves stability and reliability.
Refer to Fig. 2, wherein in an embodiment, before step S150 stops producing flue gas or before step S160 stopping generation flue gas, comprise the following steps:
Step S143, detects and judges whether to only have a slurry circulating pump to be in running status, if so, sending alarm signal.Sending alarm signal when only having a slurry circulating pump to be in running status, to remind staff's checkout facility whether to have the situations such as fault to occur, shifting to an earlier date the accidents such as pre-blast protection, improve security.
Step S145, detects and judges whether described flue gas carried out cooling process and carry out hyperthermic treatment after desulfurization process before desulfurization process, if not, sent alarm signal.So, whether break down with the equipment reminding staff to control flue gas heating and cooling, be convenient to staff and process in time, reliability is high.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a flue gas system, is characterized in that, comprising:
The electrostatic precipitator be connected with boiler, receives the flue gas provided by described boiler, is separated and traps the grit in described flue gas;
Associating blower fan, is connected with described electrostatic precipitator, transmits the flue gas through dust removal process, and described associating blower fan is provided with regulon, combines the power output of blower fan described in the draught control that described regulon is subject to according to described flue gas in transport process;
Wet desulphurization device, comprise multiple slurry circulating pump and the absorption tower being contained with slurries, described slurry circulating pump is installed in described absorption tower, described absorption tower entrance is connected with described associating blower fan, described absorption tower entrance receives the flue gas that described associating blower fan transmits, and makes slurries at described absorption tower Inner eycle to carry out desulfurization process to flue gas by described slurry circulating pump;
Flue gas discharger, exports with described absorption tower and is connected, discharge the flue gas after desulfurization process;
First processing module and the second processing module, described first processing module and described second processing module are connected with described boiler, described associating blower fan and described wet desulphurization device respectively;
Described first processing module comprises the first detecting unit and the first control unit, described first detecting unit is connected with described first control unit, described first detecting unit is connected with described slurry circulating pump and described absorption tower respectively, described first control unit is connected with described boiler, when described slurry circulating pump all quits work, described first detecting unit detects and judges whether exit, described absorption tower cigarette temperature is greater than first threshold, if so, described boiler trip is controlled after described first control unit time delay first time period;
Described second processing module comprises the second detecting unit and the second control unit, described second detecting unit is connected with described second control unit, described second detecting unit is connected with described slurry circulating pump and described associating blower fan respectively, described second control unit can be connected with described boiler, when described slurry circulating pump is in running status, described second detecting unit detects and judges whether described associating blower fan exit cigarette temperature is greater than Second Threshold, if so, described boiler trip is controlled after described second control unit time delay second time period.
2. flue gas system according to claim 1, it is characterized in that, also comprise the 3rd processing module, be provided with the pressure fan of supply described boiler oil burning required air in described boiler and be positioned at the air preheater of described boiler tail, described 3rd processing module is connected with described boiler and described associating blower fan respectively;
Described 3rd processing module comprises the 3rd detecting unit and the 3rd control unit, when after described boiler trip, described 3rd control unit pressure fan described in control section and the described associating blower fan of part after time delay the 3rd time period quit work, described 3rd detecting unit detects and judges whether described air preheater inlet flue gas temperature is less than the 3rd threshold value, if, described 3rd control unit then controls to combine blower fan described in pressure fan described in another part and another part and quits work, and controls described associating wind motor leaf and import and export door to be in opening.
3. flue gas system according to claim 1, it is characterized in that, comprise alert process module, be connected with described slurry circulating pump, described alert process module comprises alarm detecting unit and alarm control unit, described alarm detecting unit detects and judges whether to only have a described slurry circulating pump to be in running status, and if so, described alarm control unit controls to send alarm signal.
4. flue gas system according to claim 3, it is characterized in that, described wet desulphurization device also comprises flue gas heat-exchange unit, described flue gas heat-exchange unit comprises flue gas cool-down parts and flue gas intensification parts, described flue gas cool-down parts are between described associating blower fan and described absorption tower entrance, described flue gas intensification parts are between the outlet of described absorption tower and described flue gas discharger, described flue gas heat-exchange unit and described alert process model calling, described alarm detecting unit detects and judges whether the mair motor of described flue gas heat-exchange unit and auxiliary motor all quit work, if, described alarm control unit controls to send alarm signal.
5. a flue gas system control method, is characterized in that, comprises the following steps:
Receive flue gas, be separated and trap the grit in described flue gas;
When slurries stop circulation time, detect and judge whether the cigarette temperature at the flue gas desulfurization place of completing is greater than first threshold, stopping after if so, time delay first time period producing flue gas;
When slurries are in recurrent state, detect and judge whether the cigarette temperature of flue gas desulfurization porch is greater than Second Threshold, if so, stopping after time delay second time period producing flue gas; Transmit the flue gas through dust removal process, and transmit the carrying capacity of flue gas according to the draught control that described flue gas is subject in transport process;
Receive described flue gas, and by serum recycle, desulfurization process is carried out to described flue gas;
The flue gas of discharge after desulfurization process.
6. flue gas system control method according to claim 5, is characterized in that, described stopping comprises the following steps after producing flue gas:
Reduce the carrying capacity transmitting described flue gas after time delay the 3rd time period, detect and judge whether the cigarette temperature of flue gas generation place is less than the 3rd threshold value, if so, control to stop providing the carrying capacity transmitting described flue gas, and keep described exhaust gases passes unobstructed.
7. flue gas system control method according to claim 5, is characterized in that, the described flue gas of described reception, and by serum recycle, described flue gas is carried out to the step of desulfurization process, specifically comprises:
Receive described flue gas, and cooling process is carried out to flue gas;
Loop slurry is to carry out desulfurization process to the flue gas through cooling process;
Heat up through the flue gas of desulfurization process.
8. flue gas system control method according to claim 7, is characterized in that, described stopping comprises the following steps before producing flue gas:
Detect and judge whether to only have a slurry circulating pump to be in running status, if so, sending alarm signal;
Detect and judge whether described flue gas carried out cooling process and carry out hyperthermic treatment after desulfurization process before desulfurization process, if not, sent alarm signal.
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| CN108662602B (en) * | 2018-03-13 | 2019-12-27 | 中国神华能源股份有限公司 | Method and system for controlling the temperature of the exhaust smoke of a boiler |
| CN110215826B (en) * | 2019-06-05 | 2023-09-19 | 国能(山东)能源环境有限公司 | Dual-tower decoupling switching system and method for desulfurization and dust removal by circulating fluidized bed semi-dry method and application |
| CN112044257A (en) * | 2020-08-26 | 2020-12-08 | 北京国电龙源环保工程有限公司 | Method for controlling stable operation of desulfurization system |
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