CN114538565A - System for predicting residual water production in reverse osmosis device cleaning period - Google Patents
System for predicting residual water production in reverse osmosis device cleaning period Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention discloses a system for predicting residual water production in a cleaning cycle of a reverse osmosis device, which comprises a historical average water production constant block of the reverse osmosis device, a switching value constant block, a real-time water production flow analog input block of the reverse osmosis device, a switching value input block of a high-pressure water feed pump running state of the reverse osmosis device, a chemical cleaning switching value input block of the reverse osmosis device, a first two-out one switching block, an accumulation block, a first pulse block, a first delay block, a second two-out one switching block, a first subtraction block, an absolute value block, a first division block, a comparison equal block, a second subtraction block, a third two-out one switching block, a fourth two-out one switching block, an addition block, a first comparison larger block, a fifth two-out one switching block, a second division block, a residual water production analog output block in a cleaning cycle of the reverse osmosis device and a new historical average water production analog output block of the reverse osmosis device, the system can predict the residual water production amount of the reverse osmosis device before the next recovery cleaning.
Description
Technical Field
The invention belongs to the technical field of thermal control of a water treatment system, and relates to a system for predicting residual water production in a cleaning period of a reverse osmosis device.
Background
At present, reverse osmosis devices are widely applied as desalination treatment processes in water treatment systems of various industries. Although the pretreatment process of reverse osmosis inlet water is mature, the occurrence of reverse osmosis membrane pollution is inevitable, and the time for recovering and cleaning the reverse osmosis membrane is important. In the actual production process, the operating personnel can only carry out the comprehensive judgement reverse osmosis membrane through operating parameters such as the reverse osmosis membrane pressure of intaking, intersegmental pressure difference, product water flow and whether need carry out recovery and wash, can't direct prediction go out reverse osmosis membrane recovery abluent specific time point, can't accurate the accuse to reverse osmosis unit's recovery cleaning cycle for recovery is washd and is lacked planning nature, promptness.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing a system for predicting the amount of water produced remaining in a reverse osmosis unit during a cleaning cycle, which system is capable of predicting the amount of water produced remaining in the reverse osmosis unit before the next recovery cleaning is performed.
In order to achieve the purpose, the system for predicting the residual water production in the cleaning period of the reverse osmosis device comprises a historical average water production constant block of the reverse osmosis device, a switching value constant block, a real-time water production flow analog quantity input block of the reverse osmosis device, a switching value input block of the running state of a high-pressure water feed pump of the reverse osmosis device, a switching value input block of the reverse osmosis device for finishing chemical cleaning, a first one-out-of-two switching block, an accumulation block, a first pulse block, a first time delay block, a second one-out-of-one switching block and a first subtraction block, the system comprises an absolute value block, a first division block, a comparison equal block, a second subtraction block, a third alternative switching block, a fourth alternative switching block, an addition block, a first comparison greater block, a fifth alternative switching block, a second division block, a residual water production quantity analog quantity output block in a reverse osmosis device cleaning period and a new historical average water production quantity analog quantity output block of the reverse osmosis device;
the output ends of the historical average water production constant block, the switching value constant block and the second division block of the reverse osmosis device are connected with the input end of the first alternative switching block, and the output end of the first alternative switching block is connected with the input end of the third alternative switching block, the input end of the first division block, the input end of the first subtraction block, the input end of the second subtraction block and the input end of the addition block;
the reverse osmosis device finishes connection of a chemical cleaning switching value input block with an input end of a first delay block and an input end of a second alternative switching block, an output end of the first delay block is connected with an input end of an accumulation block through a first pulse block, a real-time water flow analog value input block of the reverse osmosis device and a switching value input block of a high-pressure water feed pump running state of the reverse osmosis device are connected with the input end of the accumulation block, and an output end of the accumulation block is connected with an input end of the second alternative switching block and an input end of a second subtraction block;
the output end of the second alternative switching block is connected with the input end of the first subtraction block, the input end of the comparison equal block and the input end of the third alternative switching block, the output end of the first subtraction block is connected with the input end of the first division block through the absolute value block, the output end of the first division block and the input end of the comparison equal block are connected with the input end of the fourth alternative switching block, the output end of the fourth alternative switching block is connected with the input end of the first comparison larger block, the output end of the first comparison larger block is connected with the input end of the third alternative switching block, the output end of the third alternative switching block is connected with the input end of the addition block, the output end of the addition block is connected with the input end of the second division block, the output end of the second division block is connected with the new historical average water making quantity analog output block of the reverse osmosis device and the input end of the fifth alternative switching block, the output ends of the reverse osmosis device for completing the chemical cleaning of the switch quantity input block and the second subtraction block are connected with the input end of the fifth alternative switching block, and the output end of the fifth alternative switching block is connected with the residual water production quantity analog quantity output block in the cleaning period of the reverse osmosis device.
The device also comprises a reverse osmosis device high-pressure feed water pump frequency analog input block, a reverse osmosis device inter-segment pressure difference analog input block, a second comparison larger block, a third comparison larger block, a fourth comparison larger block, a smaller block, a first and block, a second delay block, a second pulse block, a third delay block, a first RS trigger block, a third and block, a second RS trigger block and a reverse osmosis device completion chemical cleaning switching value output block;
the input block of the reverse osmosis device inter-segment pressure difference analog quantity is connected with the input end of the third larger block and the input end of the smaller block, the input block of the reverse osmosis device high-pressure feed water pump frequency analog quantity is connected with the input end of the second larger block and the input end of the fourth larger block, the output end of the second larger block and the output end of the third larger block are connected with the input end of the first and the input end of the first delay block, the output end of the fourth larger block and the output end of the smaller block are connected with the input end of the second and the input end of the second delay block, the output end of the second delay block is connected with the R pin of the first RS trigger block and the R pin of the second RS trigger block through the second pulse block, the output end of the first and the output end of the first RS trigger block are connected with the S pin of the first RS trigger block, the output end of the third delay block and the output end of the first RS trigger block are connected with the input end of the third and the input end of the block And the output end of the third and block is connected with an S pin of the second RS trigger block, and the output end of the second RS trigger block is connected with the reverse osmosis device to complete chemical cleaning switching value output block and the reverse osmosis device to complete chemical cleaning switching value input block through the reverse osmosis device.
The output of the fourth alternative switching block is compared with a constant value of 0.05 by a first comparison larger block.
The output of the second alternative switching block is compared with the block equal to the fixed value 0.
The output of the addition block is divided by the constant value 2 of the second division block.
The delay time of the first delay block is 5s, and the pulse time of the first pulse block is 0.5 s.
And the output of the frequency analog quantity input block of the high-pressure water feed pump of the reverse osmosis device is subjected to second comparison to be larger than the block and is subjected to large value selection with a preset value of 40 Hz.
And the output of the reverse osmosis device intersegment pressure difference analog quantity input block is subjected to third comparison to be larger than the output of the block and is subjected to large value selection with a preset value of 160 kPa.
And the output value of the frequency analog quantity input block of the high-pressure feed pump of the reverse osmosis device is compared with the output value of the frequency analog quantity input block of the reverse osmosis device by a fourth comparison, and the output value is selected to be larger than the output value of the frequency analog quantity input block of the reverse osmosis device by 40 Hz.
The output of the reverse osmosis device intersegment pressure difference analog quantity input block is selected to be a small value when the ratio is smaller than the block and the preset value is 90 kPa.
The pulse time of the second pulse block is 5 s.
The delay time of the second delay block is 200 s.
The delay time of the third delay block is 180 s.
The invention has the following beneficial effects:
when the system for predicting the residual water production amount in the reverse osmosis device cleaning period is specifically operated, the residual water production amount in the reverse osmosis device cleaning period is monitored in real time in a circuit simulation mode, so that the integral operation state of the reverse osmosis device in the cleaning period is controlled, the recovery cleaning of the reverse osmosis device is carried out in a planned mode, the occurrence of the shutdown accident of the water treatment system caused by the sudden recovery cleaning operation is avoided, and the safety and the stability of the water treatment system are improved. In addition, with the increase of the service time of the reverse osmosis membrane, the method can continuously perform superposition calculation updating on the historical average water production amount of the reverse osmosis device, further improve the accuracy of prediction of the residual water production amount, and simultaneously can be used as a reference judgment basis for the running condition of a pretreatment system of the reverse osmosis device.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the calculation of the frequency analog of the high-pressure feed pump of the reverse osmosis device.
Wherein, 1 is a historical average water production quantity constant block of the reverse osmosis device, 2 is a switching value constant block, 3 is a real-time water production flow analog quantity input block of the reverse osmosis device, 4 is a switching value input block of a high-pressure water supply pump running state of the reverse osmosis device, 5 is a switching value input block of the reverse osmosis device for completing chemical cleaning, 6 is a first alternative switching block, 7 is an accumulation block, 8 is a first pulse block, 9 is a first delay block, 10 is a second alternative switching block, 11 is a first subtraction block, 12 is an absolute value block, 13 is a first division block, 14 is a comparison equal block, 15 is a second subtraction block, 16 is a third alternative switching block, 17 is a fourth alternative switching block, 18 is an addition block, 19 is a first comparison greater block, 20 is a fifth alternative switching block, 21 is a second division block, 22 is a residual water production analog quantity output block in a cleaning period of the reverse osmosis device, and, 23 is a new historical average water making quantity analog output block of the reverse osmosis device, 24 is a reverse osmosis device high-pressure water feeding pump frequency analog input block, 25 is a reverse osmosis device inter-segment pressure difference analog input block, 26 is a second comparison larger block, 27 is a third comparison larger block, 28 is a fourth comparison larger block, 29 is a smaller block, 30 is a first and block, 31 is a second and block, 32 is a second delay block, 33 is a second pulse block, 34 is a third delay block, 35 is a first RS trigger block, 36 is a third and block, 37 is a second RS trigger block, and 38 is a reverse osmosis device completion chemical cleaning switching quantity output block.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and do not limit the scope of the disclosure of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1 and 2, the system for predicting the remaining water production in the cleaning cycle of the reverse osmosis device according to the present invention includes a historical average water production constant block 1 of the reverse osmosis device, a switching value constant block 2, a real-time water production flow analog input block 3 of the reverse osmosis device, a high-pressure water supply pump operation state switching value input block 4 of the reverse osmosis device, a reverse osmosis device completion chemical cleaning switching value input block 5, a first one-out switching block 6, an accumulation block 7, a first pulse block 8, a first delay block 9, a second one-out switching block 10, a first subtraction block 11, an absolute value block 12, a first division block 13, a comparison and equaling block 14, a second subtraction block 15, a third one-out switching block 16, a fourth one-out switching block 17, an addition block 18, a first comparison and greater block 19, a fifth one-out switching block 20, a second division block 21, a remaining water production analog output block 22, a residual water production in the cleaning cycle of the reverse osmosis device, a residual water production rate analog output block 2, a residual water production rate analog output block 4, a residual water production rate analog output block in the cleaning cycle of the reverse osmosis device, a water production rate analog input block 9, a water production rate analog output block, a second subtraction block 10, a second subtraction block, a third block, a fourth block, a, A new historical average water making quantity analog output block 23 of the reverse osmosis device, a frequency analog input block 24 of a high-pressure water feeding pump of the reverse osmosis device, a differential pressure analog input block 25 between sections of the reverse osmosis device, a second comparison larger than block 26, a third comparison larger than block 27, a fourth comparison larger than block 28, a smaller than block 29, a first and block 30, a second and block 31, a second delay block 32, a second pulse block 33, a third delay block 34, a first RS trigger block 35, a third and block 36, a second RS trigger block 37 and a reverse osmosis device completion chemical cleaning switching quantity output block 38;
the output ends of the historical average water making quantity constant block 1, the switching quantity constant block 2 and the second division block 21 of the reverse osmosis device are connected with the input end of the first alternative switching block 6, and the output end of the first alternative switching block 6 is connected with the input end of the third alternative switching block 16, the input end of the first division block 13, the input end of the first subtraction block 11, the input end of the second subtraction block 15 and the input end of the addition block 18;
the reverse osmosis device finishes connection of a chemical cleaning switching value input block 5 and an input end of a first delay block 9 and an input end of a second alternative switching block 10, an output end of the first delay block 9 is connected with an input end of an accumulation block 7 through a first pulse block 8, a real-time water yield analog value input block 3 of the reverse osmosis device and a high-pressure water feed pump running state switching value input block 4 of the reverse osmosis device are connected with an input end of the accumulation block 7, and an output end of the accumulation block 7 is connected with an input end of the second alternative switching block 10 and an input end of a second subtraction block 15;
the output end of the second alternative switching block 10 is connected with the input end of a first subtraction block 11, the input end of a comparison equal block 14 and the input end of a third alternative switching block 16, the output end of the first subtraction block 11 is connected with the input end of a first division block 13 through an absolute value block 12, the output end of the first division block 13 and the input end of the comparison equal block 14 are connected with the input end of a fourth alternative switching block 17, the output end of the fourth alternative switching block 17 is connected with the input end of a first comparison larger block 19, the output end of the first comparison larger block 19 is connected with the input end of the third alternative switching block 16, the output end of the third alternative switching block 16 is connected with the input end of an addition block 18, the output end of the addition block 18 is connected with the input end of a second division block 21, the output end of the second division block 21 is connected with the new historical average water production analog quantity output block 23 of the reverse osmosis device and the input end of a fifth alternative switching block 20, the output ends of the reverse osmosis device finished chemical cleaning switching value input block 5 and the second subtraction block 15 are connected with the input end of a fifth alternative switching block 20, and the output end of the fifth alternative switching block 20 is connected with a residual water production analog quantity output block 22 in a cleaning period of the reverse osmosis device.
The reverse osmosis device inter-segment pressure difference analog input block 25 is connected with the input end of a third comparison larger block 27 and the input end of a smaller block 29, the reverse osmosis device high-pressure water-feeding pump frequency analog input block 24 is connected with the input end of a second comparison larger block 26 and the input end of a fourth comparison larger block 28, the output end of the second comparison larger block 26 and the output end of the third comparison larger block 27 are connected with the input end of a first and block 30, the output end of the fourth comparison larger block 28 and the output end of the smaller block 29 are connected with the input end of a second and block 31, the output end of the second and block 31 is connected with the input end of a second delay block 32 and the input end of a third delay block 34, the output end of the second delay block 32 is connected with the R pin of a first RS trigger block 35 and the R pin of a second RS trigger block 37 through a second pulse block 33, the output end of the first and block 30 is connected with the S pin of the first RS trigger block 35, the output end of the third delay block 34 and the output end of the first RS flip-flop block 35 are connected to the input end of the third and block 36, the output end of the third and block 36 is connected to the S pin of the second RS flip-flop block 37, and the output end of the second RS flip-flop block 37 is connected to the reverse osmosis apparatus completion chemical cleaning switching value output block 38 and the reverse osmosis apparatus completion chemical cleaning switching value input block 5.
The prediction conditions of the residual water production amount in the cleaning period of the reverse osmosis device comprise the following conditions: determining the value of a historical average water production constant of the reverse osmosis device according to the historical operating parameters of the reverse osmosis device, wherein the value is the block 1; the difference value between the real-time water production flow accumulated value of the reverse osmosis device and the historical average reverse osmosis water production amount is the residual water production amount; whether the difference between the accumulated value of the water production flow and the historical average water making amount of reverse osmosis in one cleaning period of the reverse osmosis device exceeds 5% or not is judged, and the new historical average water making amount of the reverse osmosis device is recalculated; the reverse osmosis unit completion chemical cleaning switching value output block 38 indicates that the reverse osmosis unit performs a chemical cleaning as a condition for resetting the real-time accumulated value of the water production flow rate of the reverse osmosis unit in a cleaning cycle and also as a condition for resetting the remaining water production amount in the cleaning cycle of the reverse osmosis unit.
Determining the historical average water making amount of the reverse osmosis device in each cleaning period by analyzing the historical parameters, and setting the value as the output value of the historical average water making amount constant block 1 of the reverse osmosis device; the switching value constant block 2 outputs 0 when in initial use and then always outputs 1, and the historical average water making value constant block 1 of the reverse osmosis device outputs through the first alternative switching block 6.
When the output of the reverse osmosis device high-pressure feed water pump running state switching value input block 4 is 1, the high-pressure pump is in a running state and activates the input enabling end of the accumulation block 7, and at the moment, the reverse osmosis device real-time produced water flow analog value input block 3 carries out produced water flow accumulation through the accumulation block 7 and then inputs the accumulated water flow and the output value of the first one-out-of-two switching block 6 into the second subtraction block 15 for subtraction calculation.
The output value of the accumulation block 7 and the output value of the reverse osmosis device finishing the chemical cleaning switching value input block 5 are respectively input to the first input end and the input enabling end of the second alternative switching block 10, and because the historical average water making quantity of the reverse osmosis device is kept unchanged in the same cleaning period, after the reverse osmosis finishes one-time chemical cleaning (namely the reverse osmosis device finishes the chemical cleaning switching value input block 5 to output 1), a new historical average water making quantity is recalculated according to the relation between the accumulated value of the accumulation block 7 and the historical average water making quantity of the reverse osmosis device, so that the second input end of the second alternative switching block 10 is preset to be 0.
When the output of the reverse osmosis device finishing the chemical cleaning switching value input block 5 is 0, it means that the reverse osmosis device does not finish the chemical cleaning and is in a cleaning period. At this time, the output of the fifth alternative switching block 20 is the calculated value of the second subtraction block 15, and the remaining water production amount in the reverse osmosis device cleaning cycle is obtained.
When the reverse osmosis device finishes the output of the chemical cleaning switching value input block 5 to be 0, the reverse osmosis device does not finish the chemical cleaning, the output value of the second alternative switching block 10 is 0, after the comparison of the second alternative switching block 14 and the 0, the input enabling end of the fourth alternative switching block 17 is triggered to output 0, then after the comparison of the first alternative switching block 19 and the fixed value 0.05, the output of the first comparison block 19 is greater than 0, the input enabling end of the third alternative switching block 16 is not activated, and the output end of the third alternative switching block 16 is the output value of the first alternative switching block 6; at this time, the output value of the third alternative switching block 16 and the output value of the first alternative switching block 6 are the same value and are used as the input of the adding block 18 together, and the input is input into the new historical average water production quantity analog output block 23 of the reverse osmosis device after being calculated by the adding block 18 and the second division block 21, so that the obtained historical average water production quantity of the reverse osmosis device is kept unchanged, and the calculation of the residual water production quantity of the reverse osmosis device in the same period is not influenced.
When the output of the reverse osmosis device finishing the chemical cleaning switching value input block 5 is 1, the output value of the second alternative switching block 10 is the accumulated value of the accumulation block 7, and the accumulated value can be regarded as the reverse osmosis accumulated water production amount at the end of the cleaning period. At this time, the output value of the first alternative switching block 6 and the output value of the second alternative switching block 10 are subtracted by the first subtraction block 11 and then substituted into the absolute value block 12 to obtain the absolute value. The output value of the absolute value block 12 and the output value of the first alternative switching block 6 are subjected to division operation by a first division block 13, so that the relative error between the accumulated water production amount of the reverse osmosis device and the historical average water production amount of the reverse osmosis device at the end of the cleaning period is calculated.
Since the input enable terminal of the fourth one-of-two switching block 17 is not triggered, the output of the fourth one-of-two switching block 17 is the output value of the first division block 13, the output of the fourth one-of-two switching block 17 is greater than the output of the block 19 by the first comparison and compared with the fixed value of 0.05, when the relative error is less than 0.05, the output of the first compare greater block 19 is 0, the input enable terminal of the third alternative switching block 16 is not activated, the output of the third alternative switching block 16 is made the output value of the first alternative switching block 6, the output value is the historical average water making quantity of the reverse osmosis device, the output ends of the third alternative switching block 16 and the first alternative switching block 6 are calculated together by an adding block 18 and a second dividing block 21, inputting the obtained output value into a new historical average water production analog output block 23 of the reverse osmosis device, wherein the historical average water production of the reverse osmosis device is kept unchanged at the moment; when the relative error is more than 0.05, the output of the first comparison larger block 19 is 1, the input enabling end of the third one-out switching block 16 is activated, the output of the third one-out switching block 16 is the output value of the second one-out switching block 10, the output value of the first one-out switching block 6 and the output value of the second one-out switching block 10 are calculated by the addition block 18 and the second division block 21 and finally input to the new historical average water production analog quantity output block 23 of the reverse osmosis device, the new historical average water production quantity of the reverse osmosis device is represented at the moment, and meanwhile the new historical average water production quantity is substituted into the first input end of the first one-out switching block 6 to be used as the historical average water production quantity of the reverse osmosis device in the next cleaning period and participate in the calculation of the residual water production quantity in the cleaning period of the reverse osmosis device.
When the output of the reverse osmosis device finishing the chemical cleaning switching value input block 5 is 1, activating the input enabling end of the fifth alternative switching block 20, wherein the output of the fifth alternative switching block 20 is the calculated value of the second division block 21, resetting the residual water production amount in the cleaning period of the reverse osmosis device, and finally inputting the residual water production amount to the residual water production amount analog output block 22 in the cleaning period of the reverse osmosis device, wherein the residual water production amount of the reverse osmosis device in a new cleaning period is obtained at this moment.
When the output of the reverse osmosis device finished chemical cleaning switching value output block 38 is 1, the reverse osmosis device is delayed for 5 seconds by the first delay block 9 and then input into the first pulse block 8, the pulse time is 0.5s, and then the reverse osmosis device is input into the reset end of the accumulation block 7, and the accumulated value of the water output flow of the reverse osmosis device is cleared.
The output of the reverse osmosis device high-pressure feed pump frequency analog input block 24 is subjected to large value selection by a second comparison larger than block 26 and a preset value of 40Hz, the output of the reverse osmosis device inter-stage pressure difference analog input block 25 is subjected to large value selection by a third comparison larger than block 27 and a preset value of 160kPa, when the output values are met, the output value of the first and block 30 is 1, and then the first RS trigger block 35 outputs 1, which indicates that the reverse osmosis device runs stably, and the inter-stage pressure difference reaches a chemical cleaning condition, so that the chemical cleaning is required to be carried out as soon as possible.
The output of the reverse osmosis device high-pressure feed pump frequency analog input block 24 is subjected to large value selection with a preset value of 40Hz through a fourth comparison larger than block 28, the output of the reverse osmosis device inter-stage pressure difference analog input block 25 is subjected to large value selection with a preset value of 90kPa through a third comparison larger than block 27, when the output is met, the output value of the second and block 31 is 1, the output of the second and block 31 is delayed for 180s through a third delay block 34, the output value of the first RS trigger block 35 is output 1 through a third and block 36, the output value of the third and block 36 triggers the second RS trigger block 37 to output 1, then the reverse osmosis device finishes the chemical cleaning switching value output block 38 to output 1, which indicates that the reverse osmosis device runs stably, one chemical cleaning is finished, and the operation of the next cleaning period is started.
After the output value 1 of the second and block 31 is delayed by 200s by the third delay block 34, the delayed signal is input into the second pulse block 33, and the pulse time is 5 s; then, the data are respectively input into the first RS trigger block 35 and the second RS trigger block 37, and the first RS trigger block 35 and the second RS trigger block 37 are reset, which means that when one-time chemical cleaning is completed, the chemical cleaning state is reset, so that the chemical cleaning state can be counted when cleaning is started next time.
The output value of the reverse osmosis device chemical cleaning completion switching value output block 38 is the input value of the reverse osmosis device chemical cleaning completion switching value input block 5, and the output value of the reverse osmosis device inter-stage differential pressure analog value input block 25 is the first-stage differential pressure value or the second-stage differential pressure value of the reverse osmosis device.
Claims (10)
1. A system for predicting residual water production in a reverse osmosis device cleaning period is characterized by comprising a reverse osmosis device historical average water production constant block (1), a switching value constant block (2), a reverse osmosis device real-time water production flow analog input block (3), a reverse osmosis device high-pressure water feed pump running state switching value input block (4), a reverse osmosis device chemical cleaning completion switching value input block (5), a first alternative switching block (6), an accumulation block (7), a first pulse block (8), a first delay block (9), a second alternative switching block (10), a first subtraction block (11), an absolute value block (12), a first division block (13), a comparison equal block (14), a second subtraction block (15), a third alternative switching block (16), a fourth alternative switching block (17), an addition block (18), a first comparison larger block (19), A fifth alternative switching block (20), a second division block (21), a residual water making quantity analog output block (22) in a reverse osmosis device cleaning period and a new historical average water making quantity analog output block (23) of the reverse osmosis device;
the output ends of a historical average water production constant block (1), a switching constant block (2) and a second division block (21) of the reverse osmosis device are connected with the input end of a first alternative switching block (6), and the output end of the first alternative switching block (6) is connected with the input end of a third alternative switching block (16), the input end of a first division block (13), the input end of a first subtraction block (11), the input end of a second subtraction block (15) and the input end of an addition block (18);
the reverse osmosis device finishes connection of a chemical cleaning switching value input block (5) with an input end of a first delay block (9) and an input end of a second alternative switching block (10), an output end of the first delay block (9) is connected with an input end of an accumulation block (7) through a first pulse block (8), a real-time water yield analog value input block (3) of the reverse osmosis device and a high-pressure water feed pump running state switching value input block (4) of the reverse osmosis device are connected with an input end of the accumulation block (7), and an output end of the accumulation block (7) is connected with an input end of the second alternative switching block (10) and an input end of a second subtraction block (15);
the output of the second two-out-of-one switching block (10) is connected to the input of a first subtraction block (11), to the input of a comparison and equalisation block (14) and to the input of a third two-out-of-one switching block (16), the output of the first subtraction block (11) is connected via an absolute value block (12) to the input of a first division block (13), the output of the first division block (13) and the input of the comparison and equalisation block (14) are connected to the input of a fourth two-out-of-one switching block (17), the output of the fourth two-out-of-one switching block (17) is connected to the input of a first larger-than-block (19), the output of the first larger-than-block (19) is connected to the input of a third two-out-of-one switching block (16), the output of the third two-out-of-one switching block (16) is connected to the input of an addition block (18), the output of the addition block (18) is connected to the input of a second division block (21), the output end of the second division block (21) is connected with the input ends of a new historical average water production quantity analog quantity output block (23) of the reverse osmosis device and a fifth alternative switching block (20), the reverse osmosis device finishes chemical cleaning on-off quantity input block (5) and the output end of the second subtraction block (15) are connected with the input end of the fifth alternative switching block (20), and the output end of the fifth alternative switching block (20) is connected with a residual water production quantity analog quantity output block (22) in a cleaning period of the reverse osmosis device.
2. The system for predicting the residual water production amount in the reverse osmosis device cleaning cycle according to claim 1, further comprising a reverse osmosis device high-pressure feed water pump frequency analog input block (24), a reverse osmosis device inter-stage pressure difference analog input block (25), a second comparison larger than block (26), a third comparison larger than block (27), a fourth comparison larger than block (28), a smaller comparison block (29), a first and block (30), a second and block (31), a second delay block (32), a second pulse block (33), a third delay block (34), a first RS trigger block (35), a third and block (36), a second RS trigger block (37) and a reverse osmosis device completion chemical cleaning switching value output block (38);
the differential pressure analog input block (25) between the sections of the reverse osmosis device is connected with the input end of a third comparing and larger block (27) and the input end of a smaller block (29), the frequency analog input block (24) of the high-pressure feed water pump of the reverse osmosis device is connected with the input end of a second comparing and larger block (26) and the input end of a fourth comparing and larger block (28), the output end of the second comparing and larger block (26) and the output end of the third comparing and larger block (27) are connected with the input ends of a first and a block (30), the output end of the fourth comparing and larger block (28) and the output end of the smaller block (29) are connected with the input ends of a second and a block (31), the output end of the second and a block (31) is connected with the input end of a second delay block (32) and the input end of a third delay block (34), the output end of the second delay block (32) is connected with the R pin of a first RS trigger block (35) and the R pin of a second RS trigger block (37) through a second pulse block (33), the output end of the first and the block (30) is connected with the S pin of the first RS trigger block (35), the output end of the third delay block (34) and the output end of the first RS trigger block (35) are connected with the input end of the third and the block (36), the output end of the third and the block (36) is connected with the S pin of the second RS trigger block (37), and the output end of the second RS trigger block (37) is connected with the chemical cleaning switching value input block (5) by the reverse osmosis device to complete the chemical cleaning switching value output block (38) and the reverse osmosis device to complete the chemical cleaning switching value input block (5).
3. The system for predicting the amount of water produced remaining in a ro unit cleaning cycle according to claim 2, wherein the output of the fourth alternative switching block (17) is compared with a constant value of 0.05 through a first greater-than-first comparison block (19).
4. The system for predicting the amount of water remaining in a reverse osmosis unit cleaning cycle according to claim 2, wherein the delay time of the first delay block (9) is 5s and the pulse time of the first pulse block (8) is 0.5 s.
5. The system for predicting the amount of water produced remaining in a ro plant cleaning cycle according to claim 2, wherein the output of the ro plant high pressure feed pump frequency analog input block (24) is selected to be greater than the predetermined value of 40Hz by a second comparison greater than block (26).
6. The system for predicting the amount of water remaining in a ro plant cleaning cycle according to claim 2, wherein the output of the ro plant inter-stage pressure difference analog input block (25) is selected to be greater than a predetermined value of 160kPa through a third comparison greater than block (27).
7. The system for predicting the amount of water produced remaining in a ro plant cleaning cycle according to claim 2, wherein the output value of the ro plant high pressure feed pump frequency analog input block (24) is selected to be greater than the predetermined value of 40Hz by a fourth comparison greater than block (28).
8. The system for predicting the amount of water produced remaining in a reverse osmosis unit during a cleaning cycle according to claim 2, wherein the output of the block (25) for inputting the analog quantity of the pressure difference between the sections of the reverse osmosis unit is selected to be smaller than the block (29) and a predetermined value of 90 kPa.
9. The system for predicting the amount of water production remaining in a reverse osmosis unit cleaning cycle of claim 2, wherein the second pulse block (33) has a pulse time of 5 s.
10. The system for predicting the amount of water production remaining in a reverse osmosis unit wash cycle of claim 2,
the output of the second alternative switching block (10) is compared with a fixed value 0 by a comparison equal block (14);
the output of the addition block (18) is divided by the constant value 2 of the second division block (21);
the delay time of the second delay block (32) is 200 s;
the delay time of the third delay block (34) is 180 s.
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