Aeration control system and aeration control method
A control system and aeration technology, applied in water aeration, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems that are expensive, take hours or even days, and have not yet been fully popularized
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Embodiment 1
[0081] Set the desired dissolved oxygen concentration. The set dissolved oxygen value is to make the actual aeration amount as close or consistent as possible to the expected value by changing the aeration amount;
[0082] Select the control mode according to the difference between the DO actual value and the set value (expected value);
[0083] According to the difference between the DO set value and the DO actual value, the measured value of the oxygen consumption rate (OUR) tester, the measured value of the oxygen transfer efficiency (OTE) tester and the above Calculate the required aeration volume according to the actual air volume;
[0084] Adjust the fan according to the aeration rate; and when there is a large impact load or other factors that cause the deviation between the actual value of DO and the set value to exceed ±k1, the system will automatically switch to the DO feedback control mode, so that the actual value of DO can be adjusted rapidly. Back to the normal ...
Embodiment 2
[0090] The volume of the aeration tank is 0.25m 3 , Since the measurement period of the OUR measuring instrument is 15 minutes, the control period is set to 15min, SOTE=20%, SOTR=0.03kg / h, k=0.75, C * ∞20 is the saturated dissolved oxygen value at 20°C;
[0091] The initial setting value of dissolved oxygen is 2. After connecting the OUR meter, OTE meter, DO meter and aeration system to the PLC, the aeration control can be started. The three values of OUR, OTE and DO are The change will be transmitted to the PLC control cabinet through the signal transmission line, and the actual required air volume will be calculated, and the command will be transmitted to the flow control valve to achieve the command value by changing its opening, and the actual air volume value will be displayed on the signal screen through the signal line.
[0092] Under stable conditions, the OUR and OTE values do not change much, and the control quality of dissolved oxygen is stable within the rang...
specific Embodiment
[0094] 1. When OUR=30mg / L·h, DO 设定值 =2.0mg / L, OTE=8%, if the actual dissolved oxygen DO 实际值 =1.5mg / L, then Q=9.21L / min;
[0095] 2. When OUR=30mg / L·h, DO 实际值 When it rises to 2.0mg / L, Q=7.86L / min at this time;
[0096] 3. If OUR=30mg / L·h, k1=0.5mg / L, DO 实际值 When it drops to 1.4mg / L, the system starts DO feedback control, setting β=5, the last aeration Q is 8.48L / min, and now the aeration Q rises to 11.48L / min.
[0097] From 1 to 2, since the actual dissolved oxygen rises from 1.5mg / L to 2mg / L under the action of a large air volume at this time, the aeration volume also decreases accordingly, so that the actual dissolved oxygen gradually falls back closer to the set value ;From 1 to 3, due to |C 设定值 -C 实际值 |>k1(k1=0.5mg / L), start the DO feedback protection system, and the aeration volume is based on |C 设定值 -C 实际值 |The difference is adjusted so that the actual dissolved oxygen value can quickly return to the normal fluctuation range.
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