CN104266536A - Air cooling tower liquid level control method and device - Google Patents
Air cooling tower liquid level control method and device Download PDFInfo
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- CN104266536A CN104266536A CN201410497883.1A CN201410497883A CN104266536A CN 104266536 A CN104266536 A CN 104266536A CN 201410497883 A CN201410497883 A CN 201410497883A CN 104266536 A CN104266536 A CN 104266536A
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Abstract
The invention discloses an air cooling tower liquid level control method and device. An effective liquid level is selected by comparing the difference values between a detected first liquid level, a detected second liquid level and a third calculated liquid level with a preset liquid level difference value. The effective liquid level is obtained through two liquid level detection results and a liquid level calculation result so as to accurately obtain the liquid level of an air cooling tower and reduce the possibility of larger errors of the liquid level of the cooling tower. A second comparison result is obtained by comparing the height of the effective liquid level and a liquid level set point. The second comparison result is used for adjusting the valve opening degree of a drain valve so as to accurately control the drain valve and further achieve accurate adjustment of the liquid level of the cooling tower.
Description
Technical field
The present invention relates to Liquid level field, particularly relate to a kind of air cooling tower liquid level controlling method and device.
Background technology
Air separation unit, namely each component gas in air is separated, its idiographic flow is from air self-cleaning strainer, air compressor machine, chilldown system to air cleaning system, supercharger, decompressor, then to air separation column, any one link goes wrong all directly can affect the production of air separation unit.
Wherein, air cooling tower is the visual plant of chilldown system in air separation unit, in air separation unit system production process, air cooling tower level sensing with relate to device security and stable conditions whether significant process when controlling and control.
In normal productive process, no matter, all can cause more serious consequence if there is too high or too low situation in air cooling tower liquid level.When liquid level is too high, air cooling tower liquid level can exceed air compressor machine, and enters air cooling tower outlet conduit, and pressure-air can be with free state steam to enter molecular sieve, causes molecular sieve equipment water entering accident; When liquid level is too low, pressure-air can be caused to enter recirculated water return main, and then damage the nozzle of cooling fan, meanwhile, pressure-air can destroy the network of rivers, causes the security incident of equipment.
Therefore, in present air separation unit, need one badly and air cooling tower liquid level is accurately detected and the device controlled.
Summary of the invention
In view of this, the invention provides a kind of air cooling tower liquid level controlling method and device, to realize accurately detecting air cooling tower liquid level and controlling, its concrete scheme is as follows:
A kind of air cooling tower liquid level controlling method, comprising:
Direct-detection air cooling tower liquid level, obtains the first liquid level and the second liquid level;
Obtain inflow and water yield, and by air cooling tower floor space, calculate air cooling tower liquid level, i.e. the 3rd liquid level;
More described first liquid level, the second liquid level and the 3rd liquid level difference between any two and the size of default level imbalance value, obtain comparative result, chooses effective liquid level according to comparative result;
Height between more described effective liquid level and level-set point, obtains the second comparative result, is regulated by the valve opening of described second comparative result to draining valve.
Further, described foundation comparative result also comprises after choosing effective liquid level:
Fault liquid level is chosen according to comparative result;
Choose abort situation according to fault liquid level, blowdown process is carried out to described abort situation.
Further, also comprise:
Preset liquid level warning value;
When any one reaches liquid level warning value in described first liquid level, the second liquid level or the 3rd liquid level, send the first alarm signal.
Further, also comprise:
The experience aperture data of setting draining valve valve;
When the valve opening of described draining valve exceeds the default open range of experience aperture data, send the second alarm signal.
Further, described foundation fault liquid level also comprises after choosing abort situation:
Alert process is carried out to described abort situation.
A kind of air cooling tower fluid level control device, comprise: the first liquid level detection device, second liquid level detection device, first electromagnetic flowmeter, second electromagnetic flowmeter, 3rd electromagnetic flowmeter, takes into account the controller that the 3rd electromagnetic flowmeter is connected respectively with described first liquid level detection device, the second liquid level detection device, the first electromagnetic flowmeter, the second Electromagnetic Flow, wherein:
Described first liquid level detection device and the second liquid level detection device are arranged at the mutually level both sides of air cooling tower, for measuring liquid level in described air cooling tower, obtain the first liquid level and the second liquid level respectively;
Described first electromagnetic flowmeter is for obtaining chilled water inflow;
Described second electromagnetic flowmeter is for obtaining general cold water inflow;
Described 3rd electromagnetic flowmeter is for obtaining air cooling tower water yield;
Described controller is used for obtaining air cooling tower liquid level by chilled water inflow, general cold water inflow and air cooling tower water yield, i.e. the 3rd liquid level, simultaneously described controller is also also the size of difference between any two and default level imbalance value for comparing the first liquid level, the second liquid level and the 3rd, obtain comparative result, effective liquid level is chosen according to comparative result, described controller is also for the height between more described effective liquid level and level-set point, obtain the second comparative result, regulated by the valve opening of described second comparative result to draining valve.
Further, described controller comprises: acquiring unit, the computing unit be connected with described acquiring unit, the first comparing unit be connected respectively with described acquiring unit and computing unit, the second comparing unit be connected with described first comparing unit, the regulon be connected with described second comparing unit, wherein:
Described acquiring unit is for obtaining the first liquid level, the second liquid level, chilled water inflow, general cold water inflow and air cooling tower water yield;
Described computing unit is used for according to described chilled water inflow, general cold water inflow and air cooling tower water yield, calculates air cooling tower liquid level, i.e. the 3rd liquid level;
Described first comparing unit is used for more described first liquid level, the second liquid level and the 3rd liquid level difference between any two and the size of default level imbalance value, obtains comparative result, chooses effective liquid level according to comparative result;
Described second comparing unit is used for the height between more described effective liquid level and level-set point, obtains the second comparative result;
Described regulon is used for regulating according to the valve opening of described second comparative result to draining valve.
Further, described controller also comprises: the blowdown unit be connected with described first comparing unit, wherein:
Described first comparing unit chooses fault liquid level according to comparative result;
Described blowdown unit is used for choosing abort situation according to fault liquid level, carries out blowdown process to described abort situation.
Further, also comprise: the first alarm unit be connected with described first liquid level detection device, the second liquid level detection device and controller respectively,
Described first alarm unit presets liquid level warning value, when any one reaches liquid level warning value in described first liquid level, the second liquid level or the 3rd liquid level, sends the first alarm signal.
Further, also comprise: the second alarm unit be connected with described controller,
Described second alarm unit is used for, when the valve opening of draining valve exceedes the default open range of the experience aperture data of controller setting, sending the second alarm signal.
As can be seen from technique scheme, air cooling tower liquid level controlling method disclosed in the present application and device, by comparing with the size of default level imbalance value difference between any two in the first liquid level detected and the second liquid level and the 3rd liquid level three that calculates, choose effective liquid level, this programme obtains effective liquid level by two level sensing results and a liquid level result of calculation, achieve the accurate acquisition to air cooling tower liquid level, decrease the possibility of air cooling tower liquid level appearance compared with big error; And the height between more effective liquid level and level-set point, obtain the second comparative result, regulated by the valve opening of the second comparative result to draining valve, achieve the accurate control to draining valve valve, and furthermore achieved that the fine adjustment to air cooling tower liquid level.
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 or description of the prior art 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.
The flow chart of Fig. 1 a kind of air cooling tower liquid level controlling method disclosed in the embodiment of the present invention;
The structural representation of Fig. 2 a kind of air cooling tower fluid level control device disclosed in the embodiment of the present invention;
The structural representation of Fig. 3 a kind of controller disclosed in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described 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.
The invention discloses an air cooling tower liquid level controlling method, its flow chart as shown in Figure 1, comprising:
Step S11, direct-detection air cooling tower liquid level, obtain the first liquid level and the second liquid level;
At a certain At The Height of air cooling tower, two identical liquid level detection devices are set, two liquid level detection devices are separately positioned on the both sides of air cooling tower, be used for respectively detecting the liquid level of air cooling tower, obtain the first liquid level and the second liquid level, be designated as L01A and L01B respectively.
By arranging two liquid level detection devices, to measure liquid levels be to make the degree of accuracy of measurement result improve.
Step S12, acquisition inflow and water yield, and by air cooling tower floor space, calculate air cooling tower liquid level, i.e. the 3rd liquid level;
At two water inlets of air cooling tower, electromagnetic flowmeter is set respectively, two water inlets are respectively general cold water inlet and chilled water water inlet, be used for measuring the inflow of water inlet, if the flow of inlet water of the electromagnetic flowmeter metering of chilled water water inlet is the flow of inlet water of the electromagnetic flowmeter metering of F01A, Pu Lengshuijinshuikouchu is F01B; At the delivery port of air cooling tower, also electromagnetic flowmeter is set, is used for measuring the water yield at the mouth of a river, if the water flow of the electromagnetic flowmeter metering of air cooling tower water outlet is F01C.
Because air cooling tower is fixing, the floor space of air cooling tower is exactly known, if the floor space of air cooling tower is S, so, liquid level i.e. the 3rd liquid level L01C of the air cooling tower calculated is:
Preset liquid level warning value, as long as be no matter the first liquid level L01A or the second liquid level L01B or the 3rd liquid level L01C when wherein having at least one liquid level to reach liquid level warning value, just send the first alarm signal, point out some liquid levels to exceed liquid level warning value.
Different liquid levels exceeds the alarm signal difference that alarming value sends, as different colors, or different volumes, or different chimes of dooms, this is no longer going to repeat them.
Step S13, compare the first liquid level, the second liquid level and the 3rd liquid level difference between any two and the size of default level imbalance value, obtain comparative result, choose effective liquid level according to comparative result;
Preset level imbalance value H, obtain the first liquid level L01A, the second liquid level L01B and the 3rd liquid level L01C difference between any two, difference between any two and default level imbalance value are compared, draws comparative result.
When | L01A-L01B| >=H, | L01A-L01C| >=H and | during L01B-L01C| >=H, judge that L01C is as effective liquid level, because L01C is result of calculation, when difference between any two is all greater than level imbalance value, judge that L01C is worth the most accurately as in three liquid levels, i.e. effective liquid level, no matter L01A, L01B and L01C difference result between any two how, L01C is the result calculated, think that it is normal outcome, now, L01A and L01B is fault liquid level, now, choose according to fault liquid level and occur location of fault, and report to the police, prompting is carried out blowdown process to the position of breaking down and is reached normal condition to make liquid level,
When | L01A-L01B| < H, | L01A-L01C| < H and | during L01B-L01C| < H, judge that L01A is as effective liquid level, L01B and L01C is also normal level, now, reports to the police and blowdown process without the need to carrying out;
When | L01A-L01B| >=H, | L01A-L01C| >=H and | during L01B-L01C| < H, judge that L01B is as effective liquid level, L01A is fault liquid level, in this case, the difference between L01B and L01C is only had to be less than level imbalance value, and L01C is result of calculation, belong to normal level, L01B is so only had to be effective liquid level, L01A is fault liquid level, now, chooses location of fault according to fault liquid level, and report to the police, remind and blowdown process is carried out to the position of breaking down reach normal condition to make liquid level;
When | L01A-L01B| >=H, | L01A-L01C| < H and | during L01B-L01C| >=H, judge that L01A is as effective liquid level, L01B is fault liquid level, in this case, the difference between L01A and L01C is only had to be less than level imbalance value, and L01C is result of calculation, belong to normal level, L01A is so only had to be effective liquid level, L01B is fault liquid level, now, chooses location of fault according to fault liquid level, and report to the police, remind and blowdown process is carried out to the position of breaking down reach normal condition to make liquid level;
When | L01A-L01B| < H, | L01A-L01C| >=H and | during L01B-L01C| >=H, judge that L01C is as effective liquid level, L01A and L01B is fault liquid level, in this case, it is no matter the difference of L01A and L01C or the difference of L01B and L01C is all greater than level imbalance value, now, can conclude that L01A and L01B is fault liquid level, can only set L01C is effective liquid level, location of fault is chosen according to fault liquid level, and report to the police, remind and blowdown process is carried out to the position of breaking down reach normal condition to make liquid level.
Wherein, at sewage outfalls setting 4 solenoid valve for water of air cooling tower, by solenoid valve for water, blowdown process is carried out to fault liquid level.
Step S14, height between more effective liquid level and level-set point, obtained the second comparative result, regulated by the valve opening of the second comparative result to draining valve.
Preset level-set point, when effective liquid level is higher than level-set point, draining valve controlling opening of valve increases gradually, makes liquid level maintain in the normal range (NR) of level-set point;
When effective liquid level is lower than level-set point, draining valve controlling opening of valve reduces gradually, and liquid level is maintained in the normal range (NR) of level-set point.
Air cooling tower liquid level controlling method disclosed in the present embodiment, by comparing with the size of default level imbalance value difference between any two in the first liquid level detected and the second liquid level and the 3rd liquid level three that calculates, choose effective liquid level, this programme obtains effective liquid level by two level sensing results and a liquid level result of calculation, achieve the accurate acquisition to air cooling tower liquid level, decrease the possibility of air cooling tower liquid level appearance compared with big error; And the height between more effective liquid level and level-set point, obtain the second comparative result, regulated by the valve opening of the second comparative result to draining valve, achieve the accurate control to draining valve valve, and furthermore achieved that the fine adjustment to air cooling tower liquid level.
Further, air cooling tower liquid level controlling method disclosed in the present embodiment, after step s 14, can also comprise:
The experience aperture data of step S15, setting draining valve valve;
After air cooling tower runs a period of time, sum up the data in running, can show that the valve opening of draining valve can be stabilized within the scope of one, the experience aperture data of a fixed value as draining valve valve are chosen within the scope of this, and by the default open range of this scope empirically aperture data.
Step S16, when the valve opening of draining valve exceeds the default open range of experience aperture data, send the second alarm signal.
When valve opening exceeds default open range, namely send alarm signal, as: when valve opening is greater than the maximum of default open range, send alarm signal, prompting valve opening is excessive; When valve opening is less than the minimum of a value of default open range, send alarm signal, prompting valve opening is too small, to regulate timely valve opening.
Present embodiment discloses a kind of air cooling tower fluid level control device, its structural representation as shown in Figure 2, comprising:
First liquid level detection device 21, second liquid level detection device 22, first electromagnetic flowmeter 23, second electromagnetic flowmeter 24,3rd electromagnetic flowmeter 25, the controller 26 be connected with the first liquid level detection device 21, second liquid level detection device 22, first electromagnetic flowmeter 23, second electromagnetic flowmeter 24 and the 3rd electromagnetic flowmeter 25 respectively.
Wherein, the first liquid level detection device 21 is arranged at the mutually level both sides of air cooling tower with the second liquid level detection device 22, for measuring liquid level in air cooling tower, obtains the first liquid level L01A and the second liquid level L01B respectively.
First electromagnetic flowmeter 23 is arranged at chilled water water inlet, for obtaining chilled water inflow, is set to F01A; Second electromagnetic flowmeter 24 is arranged at general cold water inlet, for obtaining general cold water inflow, is set to F01B; 3rd electromagnetic flowmeter 25 is arranged at air cooling tower delivery port, for obtaining air cooling tower water yield, is set to F01C.
Controller 26 for calculating air cooling tower liquid level by chilled water inflow F01A, general cold water inflow F01B and water yield F01C, i.e. the 3rd liquid level L01C.
Because air cooling tower is fixing, the floor space of air cooling tower is exactly known, if the floor space of air cooling tower is S, so, liquid level i.e. the 3rd liquid level L01C of the air cooling tower calculated is:
Air cooling tower fluid level control device disclosed in the present embodiment, can also comprise: the first alarm unit be connected with the first liquid level detection device, the second liquid level detection device and controller respectively.
First alarm unit is used for presetting liquid level warning value, as long as be no matter that the first liquid level L01A or the second liquid level L01B or the 3rd liquid level L01C are when wherein having at least one liquid level to reach liquid level warning value, just send the first alarm signal, point out some liquid levels to exceed liquid level warning value.
Controller 26 also for comparing the first liquid level L01A, the second liquid level L01B and the 3rd liquid level L01C difference between any two and the size of default level imbalance value, obtains comparative result, chooses effective liquid level according to comparative result.
Preset level imbalance value H, obtain the first liquid level L01A, the second liquid level L01B and the 3rd liquid level L01C difference between any two, difference between any two and default level imbalance value are compared, draws comparative result.
When | L01A-L01B| >=H, | L01A-L01C| >=H and | during L01B-L01C| >=H, judge that L01C is as effective liquid level, because L01C is result of calculation, when difference between any two is all greater than level imbalance value, judge that L01C is worth the most accurately as in three liquid levels, i.e. effective liquid level, no matter L01A, L01B and L01C difference result between any two how, L01C is the result calculated, think that it is normal outcome, now, L01A and L01B is fault liquid level, now, choose according to fault liquid level and occur location of fault, and report to the police, prompting is carried out blowdown process to the position of breaking down and is reached normal condition to make liquid level,
When | L01A-L01B| < H, | L01A-L01C| < H and | during L01B-L01C| < H, judge that L01A is as effective liquid level, L01B and L01C is also normal level, now, reports to the police and blowdown process without the need to carrying out;
When | L01A-L01B| >=H, | L01A-L01C| >=H and | during L01B-L01C| < H, judge that L01B is as effective liquid level, L01A is fault liquid level, in this case, the difference between L01B and L01C is only had to be less than level imbalance value, and L01C is result of calculation, belong to normal level, L01B is so only had to be effective liquid level, L01A is fault liquid level, now, chooses location of fault according to fault liquid level, and report to the police, remind and blowdown process is carried out to the position of breaking down reach normal condition to make liquid level;
When | L01A-L01B| >=H, | L01A-L01C| < H and | during L01B-L01C| >=H, judge that L01A is as effective liquid level, L01B is fault liquid level, in this case, the difference between L01A and L01C is only had to be less than level imbalance value, and L01C is result of calculation, belong to normal level, L01A is so only had to be effective liquid level, L01B is fault liquid level, now, chooses location of fault according to fault liquid level, and report to the police, remind and blowdown process is carried out to the position of breaking down reach normal condition to make liquid level;
When | L01A-L01B| < H, | L01A-L01C| >=H and | during L01B-L01C| >=H, judge that L01C is as effective liquid level, L01A and L01B is fault liquid level, in this case, it is no matter the difference of L01A and L01C or the difference of L01B and L01C is all greater than level imbalance value, now, can conclude that L01A and L01B is fault liquid level, can only set L01C is effective liquid level, location of fault is chosen according to fault liquid level, and report to the police, remind and blowdown process is carried out to the position of breaking down reach normal condition to make liquid level.
Wherein, at sewage outfalls setting 4 solenoid valve for water of air cooling tower, by solenoid valve for water, blowdown process is carried out to fault liquid level.
Controller 26, also for the height between more effective liquid level and level-set point, obtains the second comparative result, is regulated by the valve opening of the second comparative result to draining valve.
Preset level-set point, when effective liquid level is higher than level-set point, draining valve controlling opening of valve increases gradually, makes liquid level maintain in the normal range (NR) of level-set point;
When effective liquid level is lower than level-set point, draining valve controlling opening of valve reduces gradually, and liquid level is maintained in the normal range (NR) of level-set point.
Air cooling tower fluid level control device disclosed in the present embodiment, by comparing with the size of default level imbalance value difference between any two in the first liquid level detected and the second liquid level and the 3rd liquid level three that calculates, choose effective liquid level, this programme obtains effective liquid level by two level sensing results and a liquid level result of calculation, achieve the accurate acquisition to air cooling tower liquid level, decrease the possibility of air cooling tower liquid level appearance compared with big error; And the height between more effective liquid level and level-set point, obtain the second comparative result, regulated by the valve opening of the second comparative result to draining valve, achieve the accurate control to draining valve valve, and furthermore achieved that the fine adjustment to air cooling tower liquid level.
Air cooling tower fluid level control device disclosed in the present embodiment, can also comprise: the second alarm unit 27 be connected with controller, wherein:
Second alarm unit 27 is for exceeding the default open range of experience aperture data of controller setting during in the valve opening of draining valve, send the second alarm signal.
After air cooling tower runs a period of time, sum up the data in running, can show that the valve opening of draining valve can be stabilized within the scope of one, the experience aperture data of a fixed value as draining valve valve are chosen within the scope of this, and by the default open range of this scope empirically aperture data.
When valve opening exceeds default open range, namely send alarm signal, as: when valve opening is greater than the maximum of default open range, send alarm signal, prompting valve opening is excessive; When valve opening is less than the minimum of a value of default open range, send alarm signal, prompting valve opening is too small, to regulate timely valve opening.
Present embodiment discloses a kind of controller of air cooling tower fluid level control device, its structural representation as shown in Figure 3, comprising:
Acquiring unit 31, the computing unit 32 be connected with acquiring unit 31, the first comparing unit 33 be connected respectively with acquiring unit 31 and computing unit 32, the second comparing unit 34 be connected with the first comparing unit 33, the regulon 35 be connected with the second comparing unit 34.
Wherein, acquiring unit 31 is for obtaining the first liquid level L01A, the second liquid level L01B, chilled water inflow F01A, general cold water inflow F01B and air cooling tower water yield F01C.
Computing unit 32 is for calculating air cooling tower liquid level according to chilled water inflow F01A, general cold water inflow F01B and air cooling tower water yield F01C, i.e. the 3rd liquid level L01C, concrete computational process is identical with a upper embodiment.
First comparing unit 33 is for comparing the first liquid level L01A, the second liquid level L01B and the 3rd liquid level L01C difference between any two and the size of default level imbalance value, obtain comparative result, choose effective liquid level according to comparative result, concrete comparison procedure is identical with a upper embodiment.
Second comparing unit 34, for the height between more effective liquid level and level-set point, obtains the second comparative result, and concrete comparison procedure is identical with a upper embodiment.
Regulon 35 is for regulating according to the valve opening of the second comparative result to draining valve.
Controller disclosed in the present embodiment, be applied to air cooling tower fluid level control device, obtain effective liquid level by two level sensing results and a liquid level result of calculation, achieve the accurate acquisition to air cooling tower liquid level, decrease the possibility of air cooling tower liquid level appearance compared with big error; And the height between more effective liquid level and level-set point, obtain the second comparative result, regulated by the valve opening of the second comparative result to draining valve, achieve the accurate control to draining valve valve, and furthermore achieved that the fine adjustment to air cooling tower liquid level.
Preferably, controller disclosed in the present embodiment, can also comprise: the blowdown unit 36 be connected with the first comparing unit 33.
First comparing unit 33 chooses fault liquid level according to comparative result, and blowdown unit 36, for choosing abort situation according to fault liquid level, carries out blowdown process to abort situation, so that liquid level recovers normal in time.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random access memory (RAM), internal memory, read-only storage (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. an air cooling tower liquid level controlling method, is characterized in that, comprising:
Direct-detection air cooling tower liquid level, obtains the first liquid level and the second liquid level;
Obtain inflow and water yield, and by air cooling tower floor space, calculate air cooling tower liquid level, i.e. the 3rd liquid level;
More described first liquid level, the second liquid level and the 3rd liquid level difference between any two and the size of default level imbalance value, obtain comparative result, chooses effective liquid level according to comparative result;
Height between more described effective liquid level and level-set point, obtains the second comparative result, is regulated by the valve opening of described second comparative result to draining valve.
2. method according to claim 1, is characterized in that, described foundation comparative result also comprises after choosing effective liquid level:
Fault liquid level is chosen according to comparative result;
Choose abort situation according to fault liquid level, blowdown process is carried out to described abort situation.
3. method according to claim 1, is characterized in that, also comprises:
Preset liquid level warning value;
When any one reaches liquid level warning value in described first liquid level, the second liquid level or the 3rd liquid level, send the first alarm signal.
4. method according to claim 1, is characterized in that, also comprises:
The experience aperture data of setting draining valve valve;
When the valve opening of described draining valve exceeds the default open range of experience aperture data, send the second alarm signal.
5. method according to claim 2, is characterized in that, described foundation fault liquid level also comprises after choosing abort situation:
Alert process is carried out to described abort situation.
6. an air cooling tower fluid level control device, it is characterized in that, comprise: the first liquid level detection device, second liquid level detection device, first electromagnetic flowmeter, the second electromagnetic flowmeter, the 3rd electromagnetic flowmeter, the controller that the 3rd electromagnetic flowmeter is connected is taken into account respectively with described first liquid level detection device, the second liquid level detection device, the first electromagnetic flowmeter, the second Electromagnetic Flow, wherein:
Described first liquid level detection device and the second liquid level detection device are arranged at the mutually level both sides of air cooling tower, for measuring liquid level in described air cooling tower, obtain the first liquid level and the second liquid level respectively;
Described first electromagnetic flowmeter is for obtaining chilled water inflow;
Described second electromagnetic flowmeter is for obtaining general cold water inflow;
Described 3rd electromagnetic flowmeter is for obtaining air cooling tower water yield;
Described controller is used for obtaining air cooling tower liquid level by chilled water inflow, general cold water inflow and air cooling tower water yield, i.e. the 3rd liquid level, described controller is also for comparing the first liquid level, the second liquid level and the 3rd liquid level difference between any two and the size of default level imbalance value simultaneously, obtain comparative result, effective liquid level is chosen according to comparative result, described controller is also for the height between more described effective liquid level and level-set point, obtain the second comparative result, regulated by the valve opening of described second comparative result to draining valve.
7. device according to claim 6, it is characterized in that, described controller comprises: acquiring unit, the computing unit be connected with described acquiring unit, the first comparing unit be connected respectively with described acquiring unit and computing unit, the second comparing unit be connected with described first comparing unit, the regulon be connected with described second comparing unit, wherein:
Described acquiring unit is for obtaining the first liquid level, the second liquid level, chilled water inflow, general cold water inflow and air cooling tower water yield;
Described computing unit is used for according to described chilled water inflow, general cold water inflow and air cooling tower water yield, calculates air cooling tower liquid level, i.e. the 3rd liquid level;
Described first comparing unit is used for more described first liquid level, the second liquid level and the 3rd liquid level difference between any two and the size of default level imbalance value, obtains comparative result, chooses effective liquid level according to comparative result;
Described second comparing unit is used for the height between more described effective liquid level and level-set point, obtains the second comparative result;
Described regulon is used for regulating according to the valve opening of described second comparative result to draining valve.
8. device according to claim 7, is characterized in that, described controller also comprises: the blowdown unit be connected with described first comparing unit, wherein:
Described first comparing unit chooses fault liquid level according to comparative result;
Described blowdown unit is used for choosing abort situation according to fault liquid level, carries out blowdown process to described abort situation.
9. device according to claim 6, is characterized in that, also comprises: the first alarm unit be connected with described first liquid level detection device, the second liquid level detection device and controller respectively,
Described first alarm unit presets liquid level warning value, when any one reaches liquid level warning value in described first liquid level, the second liquid level or the 3rd liquid level, sends the first alarm signal.
10. device according to claim 6, is characterized in that, also comprises: the second alarm unit be connected with described controller,
Described second alarm unit is used for, when the valve opening of draining valve exceedes the default open range of the experience aperture data of controller setting, sending the second alarm signal.
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| CN113238587A (en) * | 2021-04-30 | 2021-08-10 | 上海材料研究所 | Liquid level control device and method for water immersion ultrasonic detection water tank |
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| CN104266536B (en) | 2016-05-11 |
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