CN104460741A - Outlet temperature control system and method of EC - Google Patents
Outlet temperature control system and method of EC Download PDFInfo
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- CN104460741A CN104460741A CN201410428126.9A CN201410428126A CN104460741A CN 104460741 A CN104460741 A CN 104460741A CN 201410428126 A CN201410428126 A CN 201410428126A CN 104460741 A CN104460741 A CN 104460741A
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Abstract
The invention discloses an outlet temperature control system of an EC. The outlet temperature control system comprises a second cooling device connected with a first cooling device in parallel through a pipeline, and a second smoke flow detection device adjacent to a first smoke flow detection device. When the target temperature value does not meet a preset condition, a controller obtains a second smoke flow value detected by the second smoke flow detection device and works out the target temperature value according to the second smoke flow value; when the target temperature value worked out according to the second smoke flow value does not meet the preset condition, the controller obtains a second cooling parameter detected by the second cooling device and works out the target temperature value according to the second cooling parameter. The invention further discloses an outlet temperature control method of the EC. The outlet temperature control system and method of the EC can rapidly exclude faults and guarantee continuous and stable implementation of the process.
Description
Technical field
The present invention relates to dry dedusting technology field, more specifically, relate to a kind of outlet temperature for evaporation cooler control system and method.
Background technology
The high-temperature flue gas of a large amount of 900 DEG C ~ 1200 DEG C can be produced in convertor steelmaking process, and containing a large amount of dust in high-temperature flue gas, therefore, before high-temperature flue gas being carried out reclaim or diffusing process, need to remove the dust in high-temperature flue gas, dry method dust is conventional dust collection method.
In dust removal process, in order to meet electrostatic precipitator (Electrostatic Precipitator, EP) working temperature, before by flue gas suction EP, first flue gas is inputted devaporizer (Evaporative Cooling, EC), the temperature of flue gas in EC is reduced by the mode of spraying water and input steam, the outlet temperature of flue gas is dropped to about 200 DEG C, then, uses the blower fan being arranged on EP exit to carry out dedusting by cooled flue gas suction EP.In the process, if EC outlet temperature is too high, then the flue-gas temperature entering EP is too high, and the ratio resistance of dust reduces, and affects the use of EP, directly affects efficiency of dust collection; If EC outlet temperature is too low, the flue gas water cut entering EP can be caused too high, and crude particle dust humidity is excessive, easily produces wet grey phenomenon, and can produce condensation, condensation housing can be caused to corrode or high pressure creepage, cause device damage.As can be seen here, the EC outlet temperature control of flue gas is the key link of dust removing effects.
Traditional E C outlet temperature control system comprises: the inlet end of EC, EC connects exhanst gas outlet and the outlet of steam mixing duct, steam mixing duct entrance parallel join water pipeline and jet chimney; The outlet of EC connects the outlet connecting fan of EP, EP; EC outlet temperature is controlled by programmable logic controller (PLC) (Programmable Logic Controller, PLC).
Carrying out control to EC outlet temperature is regulate the current outlet temperature of EC, makes EC Current Temperatures in setting range.Because the temperature of flue gas in EC is reduced by the mode of water spray, when spray flow is relatively large, the current outlet temperature of EC is relatively low; When spray flow is relatively little, the current outlet temperature of EC is relatively high; Same, when PLC detects that the current outlet temperature of EC is higher, increased by the aperture controlling spray flow valve, increase spray flow; When PLC detects that the current outlet temperature of EC is higher, reduced by the aperture controlling spray flow valve, reduce spray flow.In addition, because the flue gas in EC needs by blower fan suction EP, the air quantity of blower fan produces temperature and pressure compensation to flue gas in EC, the temperature of flue gas and spray flow shape proportion relation in fan delivery and EC, when fan delivery changes, spray flow also changes thereupon; Meanwhile, the effect of blower fan is by the flue gas suction EP in EC, therefore, fan delivery with dust in flue gas and spray flow and steam content change and change.
Seen from the above description, in traditional E C outlet temperature control system, influence each other between the current outlet temperature of EC and spray flow, also influence each other between fan delivery and spray flow meanwhile.Due in control system with EC in current outlet temperature, spray flow and fan delivery any parameter be also subject to the impact of other parameters, logical relation is complicated, wherein the fluctuation of any one parameter all can cause the fluctuation of EC outlet temperature, and all there is a lot of disturbance factor in each parameter, when the current outlet temperature of EC is abnormal, cannot fault be investigated, affect the normal operation of technological process.
Summary of the invention
In view of this, the outlet temperature for evaporation cooler control system that the embodiment of the present invention provides and method, when the current outlet temperature of EC is abnormal, can investigate fault fast and accurately, ensure the operation that technological process is continual and steady.
First aspect, embodiments provide a kind of outlet temperature for evaporation cooler control system, comprise: controller, devaporizer EC and export the electrostatic precipitator EP be connected with described EC, described EC sidewall is provided with the first cooling device, and described EP exports connection first flue gas flow pick-up unit; Also comprise: by the second cooling device of pipeline and described first cooling device parallel join, and the second flue gas flow pick-up unit be disposed adjacent with described first flue gas flow pick-up unit; Wherein, it is open-minded that described controller controls described first cooling device, and described second cooling device is closed; Described first cooling device detects the first cooling parameter obtained, detect with described first flue gas flow pick-up unit the first flue gas flow obtained and input described controller, described controller carries out computing according to described first cooling parameter and described first flue gas flow and obtains target temperature value; When described target temperature value does not meet pre-conditioned, described controller obtains described second flue gas flow pick-up unit and detects the second flue gas flow value obtained, and carries out computing according to described second flue gas flow value and obtain target temperature value; When the described target temperature value obtained according to the second flue gas flow value computing do not meet described pre-conditioned time, described controller obtains described second cooling device and detects the second cooling parameter obtained, and cools parameter according to described second and carry out computing and obtain target temperature value.
Preferably, described first cooling device comprises the first water pipeline and first jet chimney of parallel join; Described second cooling device comprises the second water pipeline with described first water pipeline parallel join, and with the second jet chimney of described first jet chimney parallel join; Described first cooling parameter comprises the first spray flow of described first water pipeline, and the first steam flow of described first jet chimney; Described second cooling parameter comprises the second spray flow of described second water pipeline, and the second steam flow of described second jet chimney; Described controller obtains described second cooling device and detects the second cooling parameter obtained, comprise: described controller controls described first water pipeline and cuts out, described second water pipeline is open-minded, obtains described second spray flow, obtains target temperature value according to described second spray flow computing; When the described target temperature value obtained according to the second spray flow computing do not meet described pre-conditioned time, described controller controls described first jet chimney and cuts out, described second jet chimney is open-minded, obtain described second steam flow, and obtain target temperature value according to described second steam flow computing.
Preferably, described first cooling device comprises the first water pipeline and first jet chimney of parallel join; Described second cooling device comprises the second water pipeline with described first water pipeline parallel join, and with the second jet chimney of described first jet chimney parallel join; Described first cooling parameter comprises the first spray flow of described first water pipeline, and the first steam flow of described first jet chimney; Described second cooling parameter comprises the second spray flow of described second water pipeline, and the second steam flow of described second jet chimney; Described controller obtains described second cooling device and detects the second cooling parameter obtained, comprise: described controller controls described first water pipeline and described first jet chimney is closed simultaneously, described second water pipeline and described second jet chimney are opened simultaneously, obtain described second spray flow and described second steam flow, and obtain target temperature value according to described second spray flow and described second steam flow computing.
Preferably, described first water pipeline is provided with the first water spray stop valve and the first spray flow pick-up unit for detecting described first spray flow; Described second water pipeline is provided with the second water spray stop valve and the second spray flow pick-up unit for detecting described second spray flow; Described first jet chimney is provided with the first steam stop valve and the first steam flow detection device for detecting described first steam flow; Described second jet chimney is provided with the second steam stop valve and the second steam flow detection device for detecting described second steam flow; Wherein, described first spray flow pick-up unit, described second spray flow pick-up unit, described first water spray stop valve, described second water spray stop valve, described first steam flow detection device, described second steam flow detection device, described first steam stop valve are connected with described controller signals with described second steam stop valve; Described controller is by controlling described first water spray stop valve, the opening and cut off and control corresponding pipeline and open and cut out of described second water spray stop valve, described first steam stop valve and described second steam stop valve.
Preferably, the pressure pipeline of described first flue gas flow pick-up unit is provided with the first pipe rupture valve; The pressure pipeline of described second flue gas flow pick-up unit is provided with the second pipe rupture valve; Described first pipe rupture valve is connected with described controller signals with described second pipe rupture valve, before the described second flue gas flow pick-up unit of described controller acquisition detects the second flue gas flow value obtained, it is open-minded that described controller controls described second pipe rupture valve, and described first pipe rupture valve is closed.
Second aspect, the embodiment of the present invention additionally provides a kind of outlet temperature for evaporation cooler control method, comprising: the first cooling parameter and the first memory address obtaining the first cooling device input; Read the first flue gas flow stored in described first memory address; Carry out computing according to described first cooling parameter and described first flue gas flow and obtain target temperature; When described target temperature does not meet pre-conditioned, obtain the second memory address; Read the second flue gas flow stored in described second memory address; Target temperature value is obtained according to described second flue gas flow computing; When the described target temperature value obtained according to the second flue gas flow computing do not meet described pre-conditioned time, obtain described second cooling device input the second cooling parameter; Target temperature value is obtained according to described second cooling parameter computing.
Preferably, the second cooling parameter of described acquisition second cooling device input, comprising: send out code to the first water pipeline, sends provisioning instruction to the second water pipeline; Obtain the second spray flow of described second water pipeline; Target temperature value is obtained according to described second spray flow computing; When the described target temperature value obtained according to the second spray flow computing do not meet described pre-conditioned time, to first jet chimney send out code, to second jet chimney send OPEN; Obtain the second steam flow of described second jet chimney.
Preferably, the second cooling parameter of described acquisition second cooling device input, comprising: send out code to described first water pipeline and described first jet chimney simultaneously; Send OPEN to described second water pipeline and described second jet chimney simultaneously; Obtain described second spray flow and described second steam flow.
Preferably, described to described first water pipeline send out code be specially, on described first water pipeline first water spray stop valve send out code; Described to described first jet chimney send out code be specially, on described first jet chimney first steam stop valve send out code; Described to described second water pipeline send OPEN be specially, on described second water pipeline second water spray stop valve send OPEN; Described to described second jet chimney send OPEN be specially, on described second jet chimney second steam stop valve send OPEN.
Preferably, before acquisition second memory address, described method also comprises: send OPEN to the second pipe rupture valve; Out code is sent to the first pipe rupture valve.
As seen from the above description, outlet temperature for evaporation cooler control system provided by the present invention and method, be provided with the cooling device of two cover parallel joins, and two cover flue gas flow pick-up units.When EC outlet temperature is abnormal, the current device run is switched to the backup device of this device, compared with prior art, the impact affected between the parameter of EC outlet temperature need not be considered, can fix a breakdown fast, ensure the carrying out that technological process is continual and steady.And, if EC outlet temperature is normal after switching, then can determine to cause the factor of EC outlet temperature exception to be produced by the equipment be switched; Compared with prior art, the factor causing EC outlet temperature exception can also be determined fast and accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Shown in accompanying drawing, above-mentioned and other object of the present invention, Characteristics and advantages will be more clear.Reference numeral identical in whole accompanying drawing indicates identical part.Deliberately do not draw accompanying drawing by physical size equal proportion convergent-divergent, focus on purport of the present invention is shown.
The structural representation of the EC outlet temperature control system that Fig. 1 provides for the embodiment of the present invention;
The second embodiment structural representation of the EC outlet temperature control system that Fig. 2 provides for the embodiment of the present invention;
The EC outlet temperature control method process flow diagram that Fig. 3 provides for the embodiment of the present invention.
Embodiment
According to the relation in control system between each parameter, spray flow, steam flow and EP exiting flue gas flow three parameters are the Important Parameters affecting EC outlet temperature, and in three parameters, the fluctuation of any one parameter all can cause very large impact to EC outlet temperature.Therefore, in the embodiment of the present invention, arrange redundant loop for above-mentioned three parameters, concrete scheme is as follows.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
During in order to avoid EC outlet temperature appearance exception, cannot investigate reason, the present embodiment provides following scheme.Refer to Fig. 1, Fig. 1 shows the EC outlet temperature control system structural drawing that the embodiment of the present invention provides, described control system comprises: controller 11, EC12, and export with EC12 the EP13 be connected, EC12 sidewall is provided with the first cooling device 14, EP13 and exports connection first flue gas flow pick-up unit 15.Described control system also comprises, with second cooling device 16 of the first cooling device 14 by pipeline parallel join, and the second flue gas flow pick-up unit 17 be disposed adjacent with the first flue gas flow pick-up unit 15.
In process operation process, first cooling device 14 is in opening state under the adjustment of controller 11, second cooling device 16 is in closed condition under the adjustment of controller 11, simultaneously, first flue gas flow pick-up unit 15 will detect the first flue gas flow input control device 11 obtained, controller 11 first cooling device 14 is detected obtain first cooling parameter and the first flue gas flow carry out computing according to the program of writing in advance, obtain target temperature value, and it is pre-conditioned to judge whether this target temperature value meets.
According to actual production technique, be spray flow, steam flow and EP exiting flue gas flow on the larger parameter of EC outlet temperature impact, in the present embodiment, using common to spray flow and steam flow as cooling parameter.And in three parameters, EP exiting flue gas flow produces the maximum probability of fluctuation, therefore, when target temperature value does not meet pre-conditioned, the maximum probability that first flue gas flow has an impact, first, controller 11 reads the second flue gas flow pick-up unit 17 and detects the second flue gas flow obtained, and the second flue gas flow is carried out computing according to the program of writing in advance, obtain target temperature value; If meet pre-conditioned according to the target temperature value that the second flue gas flow computing obtains, then technological process proceeds; Otherwise controller controls the first cooling device 14 and cuts out, and controls the second cooling device 16 open-minded, obtain the second cooling device 16 and detect the second cooling parameter obtained, row operation of going forward side by side obtains target temperature value.
It may be noted that, in the embodiment of the present invention, do not meet pre-conditioned comprising: in Preset Time, target temperature value is greater than the maximal value of preset temperature range always, or be less than the minimum value of preset temperature range always, or fluctuate in the scope exceeding preset temperature range.
In addition, in process operation process, the parameter of each device input control device 11 is in continuous renewal, and controller 11 constantly obtains new parameter and carries out computing, obtain new target temperature value, constantly detect target temperature value with Time Controller 11 and whether meet pre-conditioned.
The EC outlet temperature control system that the present embodiment provides, is provided with the cooling device of two cover parallel joins, and two cover flue gas flow pick-up units.When EC outlet temperature is abnormal, the current device run is switched to the backup device of this device, compared with prior art, the impact affected between the parameter of EC outlet temperature need not be considered, can fix a breakdown fast, ensure the carrying out that technological process is continual and steady.And, if EC outlet temperature is normal after switching, then can determine to cause the factor of EC outlet temperature exception to be produced by the equipment be switched; Compared with prior art, the factor causing EC outlet temperature exception can also be determined fast and accurately.
In art production process, by the mode of water spray in EC and input steam, the high-temperature flue gas in EC is cooled, therefore, in order to the understanding technical scheme of the present invention making those skilled in the art clearly detailed, also refer to Fig. 2, the second embodiment structural representation of the EC outlet temperature control system that Fig. 2 provides for the embodiment of the present invention, on the basis of above-described embodiment, composition graphs 2 is described by the present embodiment.
In the present embodiment, first cooling device 14 comprises the first water pipeline 141 and the first jet chimney 142 of parallel join, second cooling device 16 comprises the second water pipeline 161 with the first water pipeline 141 parallel join, and with the second jet chimney 162 of the first jet chimney 142 parallel join.First water pipeline 141, first jet chimney 142, second water pipeline 161 is connected steam mixing duct with the outlet of the second jet chimney 162, by steam mixing duct steam mixed and be transported in EC, therefore, first cooling parameter comprises: the first spray flow of the first water pipeline 141, and the first steam flow of described first jet chimney 142; Second cooling parameter comprises: the first spray flow of the second water pipeline 161, and the first steam flow of described first jet chimney 162.
Due in cooling parameter, the probability of spray flow fluctuation is relatively large, the probability of steam flow fluctuation is relatively little, therefore, controller controls the first cooling device 14 and cuts out, control the second cooling device 16 open-minded, obtain the second cooling device 16 and detect the second cooling parameter obtained, can be switch one by one according to the probability of parameter fluctuation, be specially: controller 11 controls the first water pipeline 141 and cuts out, second water pipeline 161 is open-minded, obtains the second spray flow, and obtains target temperature value according to the second spray flow computing; If meet pre-conditioned according to the target temperature value that the second spray flow computing obtains, technological process continues; If this target temperature value does not meet pre-conditioned, controller 11 controls the first jet chimney 142 and cuts out, and the second jet chimney 162 is open-minded, obtains the second steam flow, and obtains target temperature value according to the second steam flow computing.This mode controlling to switch, not only can regulate target temperature value by the mode switching pipeline, can also lock the factor affecting target temperature value quickly and accurately.
Certainly, above-mentioned control mode is only a preferred exemplary of the present invention, technical solution of the present invention is not limited thereto, the another kind of optimal way that acquisition second cooling device 16 provided by the invention detects the second cooling parameter obtained comprises: controller 11 controls the first water pipeline 141 and the first jet chimney 142 is closed simultaneously, second water pipeline 161 and the second jet chimney 162 are opened simultaneously, obtain the second spray flow and the second steam flow, and obtain target temperature value according to the second spray flow and the second steam flow computing.This control mode, can be adjusted to target temperature value and meet pre-conditioned, thus ensure the carrying out of technological process fast and stable within the shortest time.
It may be noted that, the control mode of the embodiment of the present invention is not limited only to above-mentioned two kinds, can also when target temperature value meet pre-conditioned, flue gas flow pick-up unit, spray flow pick-up unit and steam flow detection device are switched, the present invention does not limit this simultaneously.
Because traditional E C outlet temperature control system is by controlling spray flow governor valve control spray flow, whole piece pipeline need not be closed, and the EC outlet temperature control system that the embodiment of the present invention provides need to pipeline open and closedown regulates, therefore, the EC outlet temperature control system concrete structure that provides of the embodiment of the present invention is as follows: the first water pipeline 141 is provided with the first spray flow variable valve 1411, for detecting the first spray flow pick-up unit 1412 and the first water spray stop valve 1413 of the first spray flow; Second water pipeline 161 is provided with the second spray flow variable valve 1611, for detecting the second spray flow pick-up unit 1612 and the second water spray stop valve 1613 of the second spray flow; First jet chimney 142 is provided with the first steam flow detection device 1421 and the first steam stop valve 1422 for detecting described first steam flow; Second jet chimney 162 is provided with the second steam flow detection device 1621 and the second steam stop valve 1622 for detecting described second steam flow.
Wherein, the spray flow of controller 11 by regulating the aperture of the first spray flow variable valve 1411 to regulate the first water pipeline, by the spray flow regulating the aperture of the second spray flow variable valve 1611 to regulate the first water pipeline, first spray flow pick-up unit 1412, second spray flow pick-up unit 1612, first steam flow detection device 1421 and the second steam flow detection device 1621 will detect the corresponding parameter input control device 11 obtained, controller 11 constantly adjusts the aperture of the first spray flow variable valve 1411 or the second spray flow variable valve 1611 according to the target temperature value calculated.When target temperature value does not meet pre-conditioned, controller 11 to spray water opening and cutting off and controlling corresponding pipeline and open and cut out of stop valve 1613, first steam stop valve 1422 and the second steam stop valve 1622 by controlling the first water spray stop valve 1413, second.To the concrete operations order of pipeline, as foregoing description, the present invention repeats no more herein.
The present embodiment, by arranging stop valve on different pipeline, when target temperature value does not meet pre-conditioned, can switch pipeline in time, thus ensures normally carrying out of technological process; And pipeline is arranged corresponding functional devices, if pipeline fault, the device of generation fault can be checked out accurately, thus reason of can fixing a breakdown in time.
It may be noted that, because flue gas flow pick-up unit is by the pressure of pressure pipeline and the mode calculating pressure reduction detects EP exiting flue gas flow, after a period of time, the particle in flue gas can be infected with on pressure pipeline, thus affects the accuracy of pressure.In order to solve the problem, the pressure pipeline of the first flue gas flow pick-up unit 15 that the embodiment of the present invention provides is provided with the first pipe rupture valve; The pressure pipeline of the second flue gas flow pick-up unit 17 is provided with the second pipe rupture valve.When controller 11 obtains the first flue gas flow, controller 11 can control the second pipe rupture valve and cut out, and the second flue gas flow pick-up unit 17 is quit work, then can purge the pressure pipeline of the second flue gas flow pick-up unit 17; When controller 11 obtains the second flue gas flow, the first pipe rupture valve can be controlled and close, the first flue gas flow pick-up unit 15 be quit work, and the pressure pipeline of the second flue gas flow pick-up unit 17 is purged.In the present embodiment, by pipe rupture valve, flue gas flow pick-up unit is switched, when not affecting technological process and normally carrying out, can also be cleared up by purging the pressure pipeline of cut-off flue gas flow pick-up unit, thus pressure line clear can be kept, data flue gas flow pick-up unit being detected obtain are more accurate, simultaneously also can serviceable life of prolong smoke flow detector.
In addition, the mode that above-described embodiment arranges Redundant Control loop for flue gas flow, spray flow and steam flow is described, based on technological thought of the present invention, other factors are also comprised to the factor that EC outlet temperature can have an impact, such as, EP exiting flue gas pressure etc., the embodiment of the present invention can also arrange redundant loop for the loop of other factors, and the present invention does not limit this.Certainly, above are only optimal technical scheme provided by the invention, wherein, the redundant loop of each parameter not only can be one, and also can be some when not affecting technological process and normally carrying out, the present invention does not limit this.
According to foregoing description, outlet temperature for evaporation cooler control system provided by the present invention, is provided with the cooling device of two cover parallel joins, and two cover flue gas flow pick-up units.When EC outlet temperature is abnormal, the current device run is switched to the backup device of this device, compared with prior art, the impact affected between the parameter of EC outlet temperature need not be considered, can fix a breakdown fast, ensure the carrying out that technological process is continual and steady.And, if EC outlet temperature is normal after switching, then can determine to cause the factor of EC outlet temperature exception to be produced by the equipment be switched; Compared with prior art, the factor causing EC outlet temperature exception can also be determined fast and accurately.
Based on said apparatus, the embodiment of the present invention additionally provides outlet temperature for evaporation cooler control method, see the EC outlet temperature control method process flow diagram that Fig. 3, Fig. 3 provide for the embodiment of the present invention, said method comprising the steps of:
Step S101: the first cooling parameter and the first memory address obtaining the first cooling device input.
The controller of the embodiment of the present invention is that PLC, PLC and EC outlet temperature control system sets up signal connection, receives the parameter of EC outlet temperature control system input.Because technological process is carried out in process, all the time a cooling device is only had in operation, and two flue gas flow pick-up units can run simultaneously, now PLC can receive two flue gas flows simultaneously, therefore, PLC, when programming, is respectively two flue gas flows and arranges two different memory addresss, one of them memory address is read address by default.
Step S102: read the first flue gas flow stored in the first memory address.
Wherein, the first flue gas flow pick-up unit is detected the first flue gas flow obtained and writes in the first memory address and store by PLC; Second flue gas flow pick-up unit is detected the second flue gas flow obtained to write in the second memory address and store, in the present embodiment, when PLC reads flue gas flow, first give tacit consent to the first flue gas flow in reading first memory address.Certainly, also can give tacit consent to the second flue gas flow in reading second memory address, the present invention does not limit this.
Step S103: carry out computing according to the first cooling parameter and the first flue gas flow and obtain target temperature.
Programme in advance according to the relation between each parameter of control system in PLC, when reading the parameter of each device input of control system, carrying out computing according to the program of writing in advance, obtaining target temperature value, target temperature value being detected simultaneously.
Step S104: when target temperature does not meet pre-conditioned, obtains the second memory address.
Detecting target temperature value described in the embodiment of the present invention specifically comprises: judge target temperature value whether in preset temperature range, if not in preset temperature range, whether exceed Preset Time, if in Preset Time, target temperature value all not in preset temperature range, then thinks that target temperature value does not meet pre-conditioned.
In the present embodiment, target temperature value does not comprise following situation in preset range: target temperature value is greater than the maximal value of preset temperature range, or is less than the minimum value of preset temperature range, or fluctuates in the scope exceeding preset temperature range.
Step S105: read the second flue gas flow stored in the second memory address.
Because flue gas flow is the factor of maximum probability of fluctuating in the factor affecting EC outlet temperature, therefore, when target temperature value does not meet pre-conditioned, read the second flue gas flow.
It may be noted that, when PLC reads the second flue gas flow, out code can be sent to the first pipe rupture valve of the first flue gas flow pick-up unit, the pressure pipeline of the first flue gas flow pick-up unit is cut off, first flue gas flow pick-up unit is quit work, purging instruction can be sent, so that the pressure pipeline of cleaning the first flue gas flow pick-up unit simultaneously.Certainly, if now the pressure pipeline of the second flue gas flow pick-up unit is in closed condition, first needs to send OPEN to the second pipe rupture valve, and detect the second flue gas flow pick-up unit and whether can use.
Step S106: obtain target temperature value according to the second flue gas flow computing.
Step S107: when the target temperature value obtained according to the second flue gas flow computing does not meet pre-conditioned, obtains the second cooling parameter of the second cooling device input.
According to the above-mentioned description to device, in the present embodiment, the second cooling parameter obtaining the second cooling device input comprises: send out code to the first water pipeline, send provisioning instruction to the second water pipeline; Obtain the second spray flow of the second water pipeline; Target temperature value is obtained according to the second spray flow computing; When the target temperature value obtained according to the second spray flow computing does not meet pre-conditioned, send out code to the first jet chimney, send OPEN to the second jet chimney; Obtain the second steam flow of the second jet chimney; Or, send out code to the first water pipeline and the first jet chimney simultaneously; Send OPEN to the second water pipeline and the second jet chimney simultaneously; Obtain the second spray flow and the second steam flow.
Certainly, PLC closes the first water pipeline by sending out code to the first water spray stop valve on the first water pipeline; The second water pipeline is opened by sending OPEN to the second water spray stop valve on the second water pipeline; The first jet chimney is closed by sending out code to the first steam stop valve on the first jet chimney; The second jet chimney is opened by sending OPEN to the second steam stop valve on the second jet chimney.
Step S108: obtain target temperature value according to the second cooling parameter computing.
After control loop all switches, when the target temperature value that PLC computing obtains still does not meet pre-conditioned, think technological process fault.
Comprehensively above-mentioned, outlet temperature for evaporation cooler control system provided by the present invention and method, be provided with the cooling device of two cover parallel joins, and two cover flue gas flow pick-up units.When EC outlet temperature is abnormal, the current device run is switched to the backup device of this device, compared with prior art, the impact affected between the parameter of EC outlet temperature need not be considered, can fix a breakdown fast, ensure the carrying out that technological process is continual and steady.And, if EC outlet temperature is normal after switching, then can determine to cause the factor of EC outlet temperature exception to be produced by the equipment be switched; Compared with prior art, the factor causing EC outlet temperature exception can also be determined fast and accurately.
Be understandable that, the present invention can be used in numerous general or special purpose computing system environment or configuration.Such as: personal computer, server computer, handheld device or portable set, laptop device, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer, the distributed computing environment comprising above any system or equipment etc. based on microprocessor.
The present invention can describe in the general context of computer executable instructions, such as program module.Usually, program module comprises the routine, program, object, assembly, data structure etc. that perform particular task or realize particular abstract data type.Also can put into practice the present invention in a distributed computing environment, in these distributed computing environment, be executed the task by the remote processing devices be connected by communication network.In a distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium comprising memory device.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. outlet temperature for evaporation cooler control system, comprise: controller, devaporizer EC and export the electrostatic precipitator EP be connected with described EC, described EC sidewall is provided with the first cooling device, and described EP exports connection first flue gas flow pick-up unit, it is characterized in that, also comprise:
By the second cooling device of pipeline and described first cooling device parallel join, and the second flue gas flow pick-up unit be disposed adjacent with described first flue gas flow pick-up unit;
Wherein, it is open-minded that described controller controls described first cooling device, and described second cooling device is closed; Described first cooling device detects the first cooling parameter obtained, detect with described first flue gas flow pick-up unit the first flue gas flow obtained and input described controller, described controller carries out computing according to described first cooling parameter and described first flue gas flow and obtains target temperature value;
When described target temperature value does not meet pre-conditioned, described controller obtains described second flue gas flow pick-up unit and detects the second flue gas flow value obtained, and carries out computing according to described second flue gas flow value and obtain target temperature value; When the described target temperature value obtained according to the second flue gas flow value computing do not meet described pre-conditioned time, described controller obtains described second cooling device and detects the second cooling parameter obtained, and cools parameter according to described second and carry out computing and obtain target temperature value.
2. control system as claimed in claim 1, it is characterized in that, described first cooling device comprises the first water pipeline and first jet chimney of parallel join; Described second cooling device comprises the second water pipeline with described first water pipeline parallel join, and with the second jet chimney of described first jet chimney parallel join; Described first cooling parameter comprises the first spray flow of described first water pipeline, and the first steam flow of described first jet chimney; Described second cooling parameter comprises the second spray flow of described second water pipeline, and the second steam flow of described second jet chimney;
Described controller obtains described second cooling device and detects the second cooling parameter obtained, and comprising:
Described controller controls described first water pipeline and cuts out, and described second water pipeline is open-minded, obtains described second spray flow, obtains target temperature value according to described second spray flow computing;
When the described target temperature value obtained according to the second spray flow computing do not meet described pre-conditioned time, described controller controls described first jet chimney and cuts out, described second jet chimney is open-minded, obtain described second steam flow, and obtain target temperature value according to described second steam flow computing.
3. control system as claimed in claim 1, it is characterized in that, described first cooling device comprises the first water pipeline and first jet chimney of parallel join; Described second cooling device comprises the second water pipeline with described first water pipeline parallel join, and with the second jet chimney of described first jet chimney parallel join; Described first cooling parameter comprises the first spray flow of described first water pipeline, and the first steam flow of described first jet chimney; Described second cooling parameter comprises the second spray flow of described second water pipeline, and the second steam flow of described second jet chimney;
Described controller obtains described second cooling device and detects the second cooling parameter obtained, and comprising:
Described controller controls described first water pipeline and described first jet chimney is closed simultaneously, described second water pipeline and described second jet chimney are opened simultaneously, obtain described second spray flow and described second steam flow, and obtain target temperature value according to described second spray flow and described second steam flow computing.
4. control system as claimed in claim 2 or claim 3, is characterized in that, described first water pipeline being provided with the first water spray stop valve and the first spray flow pick-up unit for detecting described first spray flow; Described second water pipeline is provided with the second water spray stop valve and the second spray flow pick-up unit for detecting described second spray flow; Described first jet chimney is provided with the first steam stop valve and the first steam flow detection device for detecting described first steam flow; Described second jet chimney is provided with the second steam stop valve and the second steam flow detection device for detecting described second steam flow;
Wherein, described first spray flow pick-up unit, described second spray flow pick-up unit, described first water spray stop valve, described second water spray stop valve, described first steam flow detection device, described second steam flow detection device, described first steam stop valve are connected with described controller signals with described second steam stop valve; Described controller is by controlling described first water spray stop valve, the opening and cut off and control corresponding pipeline and open and cut out of described second water spray stop valve, described first steam stop valve and described second steam stop valve.
5. control system as claimed in claim 1, is characterized in that, the pressure pipeline of described first flue gas flow pick-up unit is provided with the first pipe rupture valve; The pressure pipeline of described second flue gas flow pick-up unit is provided with the second pipe rupture valve;
Described first pipe rupture valve is connected with described controller signals with described second pipe rupture valve, before the described second flue gas flow pick-up unit of described controller acquisition detects the second flue gas flow value obtained, it is open-minded that described controller controls described second pipe rupture valve, and described first pipe rupture valve is closed.
6. outlet temperature for evaporation cooler control method, is characterized in that, comprising:
Obtain the first cooling parameter and the first memory address of the first cooling device input;
Read the first flue gas flow stored in described first memory address;
Carry out computing according to described first cooling parameter and described first flue gas flow and obtain target temperature;
When described target temperature does not meet pre-conditioned, obtain the second memory address;
Read the second flue gas flow stored in described second memory address;
Target temperature value is obtained according to described second flue gas flow computing;
When the described target temperature value obtained according to the second flue gas flow computing do not meet described pre-conditioned time, obtain described second cooling device input the second cooling parameter;
Target temperature value is obtained according to described second cooling parameter computing.
7. control method as claimed in claim 6, is characterized in that, the second cooling parameter of described acquisition second cooling device input, comprising:
Send out code to the first water pipeline, send provisioning instruction to the second water pipeline;
Obtain the second spray flow of described second water pipeline;
Target temperature value is obtained according to described second spray flow computing;
When the described target temperature value obtained according to the second spray flow computing do not meet described pre-conditioned time, to first jet chimney send out code, to second jet chimney send OPEN;
Obtain the second steam flow of described second jet chimney.
8. control method as claimed in claim 6, is characterized in that, the second cooling parameter of described acquisition second cooling device input, comprising:
Send out code to described first water pipeline and described first jet chimney simultaneously;
Send OPEN to described second water pipeline and described second jet chimney simultaneously;
Obtain described second spray flow and described second steam flow.
9. as claimed in claim 7 or 8 control method, is characterized in that, describedly sends out code to described first water pipeline and is specially, and sends out code to the first water spray stop valve on described first water pipeline;
Described to described first jet chimney send out code be specially, on described first jet chimney first steam stop valve send out code;
Described to described second water pipeline send OPEN be specially, on described second water pipeline second water spray stop valve send OPEN;
Described to described second jet chimney send OPEN be specially, on described second jet chimney second steam stop valve send OPEN.
10. control method as claimed in claim 6, it is characterized in that, before acquisition second memory address, described method also comprises:
OPEN is sent to the second pipe rupture valve;
Out code is sent to the first pipe rupture valve.
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