CN112387315A - Efficient mixed bed regeneration method - Google Patents
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Abstract
The invention discloses a high-efficiency mixed bed regeneration method. The method adopts an automatic valve and a water quality online monitoring instrument, innovatively optimizes a mixed bed regeneration method, a step sequence and key control parameters, and increases the limit of valve in-place conditions in the mixed bed regeneration step sequence regeneration process, thereby improving the mixed bed regeneration effect. The regeneration step sequence of the optimized mixed bed is as follows: backwashing layering, settling, draining, premixing, regenerating I, regenerating II, replacing, flushing, cleaning, draining, mixing, degreasing, filling water, washing draining, washing and refluxing, and relieving pressure. The invention avoids the acid cross of the system, improves the regeneration effect of the mixed bed, protects the equipment and ensures that the effluent quality of the mixed bed reaches the standard.
Description
Technical Field
The invention relates to a high-efficiency mixed bed regeneration method, and belongs to the field of control systems.
Background
The mixed bed process of the demineralized water treatment system is used for producing high-quality demineralized water, and the conductivity of produced water is required to be less than 0.2 mu s/cm so as to meet the requirement of water for producing special steel. In order to ensure the water quality of the product, acid and alkali are needed to regenerate the anions and cations after the mixed bed is operated for a period of time. Because the regeneration step sequence is complex and needs to be carried out through the logic switching of a plurality of valves, the mixed bed regeneration process is generally completed by adopting PLC program control. The regeneration step sequence is realized by setting the time of each step through a program and switching valves, and the whole regeneration process is completed through the steps of backwashing layering, regeneration, replacement, flushing, cleaning, water drainage, air mixing, flushing and the like. Before the regeneration I step, other valves are closed, and then an acid inlet valve and an alkali inlet valve are opened, so that the mixed bed completes the regeneration and replacement processes. In the process, if any one of the backwashing water inlet valve, the normal water inlet valve, the water production valve and the air inlet valve is not closed tightly due to faults, acid can be connected into a corresponding pipeline in series to cause damage, and the regeneration effect is greatly reduced. The general production line is produced by connecting a plurality of mixed beds in parallel, a total water inlet pipeline and a total water outlet pipeline are connected together, once acid liquor enters a normal water inlet pipeline through a backwashing water inlet valve, other normally operated mixed beds are connected with acid water in series, the conductivity of outlet water is increased, and the outlet water of other mixed beds is polluted; if the normal water producing valve is not tight, the acid water is directly connected into the water outlet pipeline in series, and the consequence is more serious.
In order to avoid the situation, some limiting conditions are added in the program, and the regeneration step sequence of the mixed bed is reasonably optimized, so that the system can safely operate, and the regeneration effect of the mixed bed is improved.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide an efficient mixed bed regeneration method, which optimizes the mixed bed regeneration step sequence by increasing the limiting conditions, improves the regeneration effect and ensures the water yield and the water quality of a mixed bed system.
The invention adopts the automatic valve and the water quality on-line monitoring instrument, innovatively optimizes the mixed bed regeneration method, and improves the regeneration efficiency; in order to ensure that the effluent is not polluted, improve the regeneration efficiency of the mixed bed and increase the conditions, double insurance is arranged. Taking the outlet conductance detection value of the mixed bed as the running condition: when the mixed bed is in a normal operation state and the water outlet conductance is more than 0.2 mu s/cm, the equipment is forced to stop operation.
The invention provides a high-efficiency mixed bed regeneration method, which comprises the following steps:
(1) increasing the operation conditions in the mixed bed regeneration step: before regeneration I begins, confirming that a backwashing water inlet valve, a water outlet valve and an air inlet valve are closed, and if one valve is not closed in place, forcing the equipment to automatically stop;
(2) taking the outlet conductance data of each mixing bed as an operation condition, and forcing equipment to stop operation when the other mixing beds are in a normal operation state and the outlet conductance is more than 0.2 mu s/cm; taking the outlet conductance detection value of the mixed bed as the running condition: when the mixed bed is in a normal operation state and the water outlet conductance is more than 0.2 mu s/cm, the equipment is forced to stop operation. Thus, double insurance is arranged, and the safe operation of the mixed bed is ensured.
(3) Adjusting and optimizing the running state and running time of each step valve, wherein the optimized regeneration step of the mixed bed is as follows: backwashing layering, settling, draining, premixing, regenerating I, regenerating II, replacing, flushing, cleaning, draining, mixing, degreasing, filling water, washing draining, washing and refluxing, and relieving pressure.
All other valves were closed before regeneration premixing as a condition for opening the acid inlet valve. The following situations are avoided: firstly, if the water inlet valve is not closed tightly, the acid liquor flows backwards from the upper end of the mixing bed through the water inlet valve and enters the main water inlet pipe, and is mixed with other normally filtered mixing beds to pollute the water quality of effluent; secondly, if the backwashing water inlet valve is not tight, the acid water directly enters the main water inlet pipe through the backwashing water inlet valve, and the result is the same as that of the first step; thirdly, if the air inlet valve is not closed tightly, acid liquor enters the compressed air pipe through the valve, and other gas-using equipment can be damaged; and fourthly, if the water outlet valve is not closed tightly, the acid water directly enters the main water outlet pipe through the water outlet valve to pollute the main outlet water, so that water quality accidents are caused, and the consequences are more serious.
Aiming at the situation, the valve switch in-place signal is used as a necessary condition for system operation, a program is programmed, when the mixed bed is in regeneration and premixing, the backwashing water inlet valve, the mixed bed water inlet, the water production and the air inlet valve are confirmed to be closed, and if one valve is not closed in place, the equipment is forced to stop operation. And starting after the equipment fault is eliminated.
In the above regeneration method, the specific operation of step (3) is as follows:
1) backwash stratification (1800 s): closing a water outlet valve of the mixed bed, opening an exhaust valve of the mixed bed, opening an upper discharge valve, opening a backwashing water inlet valve, starting a water supply pump of the mixed bed, adjusting the opening of a manual valve of backwashing water inlet, wherein the backwashing flow is 75m3/h-85m3/h；
2) Sedimentation (900 s): stopping the water supply pump of the mixed bed, closing the back washing water inlet valve of the mixed bed, confirming that the back washing water inlet valve of the mixed bed is in a closed state, and closing the upper discharge valve of the mixed bed;
3) drainage (580 s): opening a middle discharge valve of the mixed bed, confirming the opening degree of the middle discharge manual valve on site, and ensuring that the liquid level is 200mm +/-5 mm above the resin layer;
4) premix (60 s): confirming the closing of the water inlet valve, the water outlet valve, the backwashing water inlet valve and the air inlet valve of the mixed bed, opening the valve of the acid inlet pipe of the mixed bed, opening the valve of the alkali inlet pipe of the mixed bed, opening the water inlet valve of the acid ejector, opening the water inlet valve of the alkali ejector and starting the regeneration water pump, wherein the flow of the acid pre-ejection inlet is 25-30m3The flow rate of an alkali pre-injection inlet is 20-25m3H, the pre-injection time is 60 s;
the acid is hydrochloric acid, and the alkali is sodium hydroxide;
5) regeneration i (1500 s): opening an acid inlet valve of an acid ejector, opening an alkali inlet valve of an alkali ejector, and keeping the mass concentration of the acid regeneration liquid in the mixed bed to be 5% and the mass concentration of the alkali regeneration liquid to be 4%; the regeneration time is 1500 s;
6) regeneration ii (1200 s): closing an acid inlet valve of the acid ejector, confirming that the acid inlet valve of the acid ejector is closed, and adding alkali for the regeneration time of 1200 s;
in the regeneration step I, acid and alkali are regenerated simultaneously, and in the regeneration step II, alkali is regenerated;
7) substitution (2700 s): closing the alkali inlet valve of the alkali ejector, confirming that the alkali inlet valve of the alkali ejector is closed, enabling the middle exhaust valve to be in an open state, and setting the replacement time to be 2700 s;
8) rinsing (600 s): stopping the regeneration pump, closing a water inlet valve of the acid ejector, closing a water inlet valve of the alkali ejector, closing a valve of an acid inlet pipe of the mixed bed, closing a valve of a alkali inlet pipe of the mixed bed, confirming that the valves are closed, opening the water inlet valve of the mixed bed, opening a middle discharge valve, and starting a water supply pump of the mixed bed;
9) cleaning (600 s): opening a lower discharge valve of the mixed bed, closing a middle discharge valve, cleaning for 600s, and cleaning by using secondary desalted water at the upstream of the mixed bed;
10) drainage (480 s): stopping the mixed bed water supply pump, and draining 480s until the liquid level is 150-200 mm above the resin layer;
11) mixing (120 s): opening an air inlet valve of the mixed bed, closing a lower discharge valve of the mixed bed, and controlling the air inlet pressure of the mixed bed to be 0.1-0.2MPa and the mixing time to be 120 s;
12) defatting (120 s): opening a lower discharge valve and closing an air inlet valve of the mixed bed;
13) water filled (240 s): starting a water inlet valve of the mixed bed, starting a water supply pump of the mixed bed, and entering the next step when water is filled until a vent valve of the mixed bed has water overflow;
14) main wash drain (2500 s): closing an exhaust valve of the mixed bed, draining 2500s through a lower discharge valve, and opening a water outlet valve of the mixed bed;
15) forward wash reflux (3000 s): when the water is positively washed until the drainage conductivity is less than or equal to 10 mus/cm, the mixed bed reflux valve is opened, the mixed bed lower drainage valve is closed, when the water is positively washed until the drainage conductivity is less than or equal to 0.2 mus/cm, the mixed bed water supply pump is stopped, the mixed bed reflux valve is closed, and the mixed bed water inlet valve is closed;
16) pressure relief (30 s): and opening an exhaust valve of the mixing bed, and relieving pressure for 30s for later use.
The invention has the beneficial effects that:
the step sequence optimization provided by the invention avoids the acid cross of the system, improves the regeneration effect of the mixed bed, protects the equipment and ensures that the quality of the effluent of the mixed bed reaches the standard.
Drawings
FIG. 1 is a schematic view of the connection of a mixed bed valve and a pipeline. The valves in the figure are all pneumatic cut-off valves and can be remotely and automatically switched.
In the figure: the device comprises a water inlet pipe 1, a backwashing pipe 2, an acid inlet pipe 3, an air inlet pipe 4, an upper exhaust pipe 5, a lower exhaust pipe 6, a water outlet pipe 7, a mixed bed 8, an exhaust pipe 9, a pneumatic cut-off valve 10, a middle exhaust valve 11, a flow meter 12 and a conductivity meter 13.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
the invention provides a high-efficiency mixed bed regeneration method, which comprises the following steps:
(1) increasing the operation conditions in the mixed bed regeneration step: before regeneration I begins, confirming that a backwashing water inlet valve, a water outlet valve and an air inlet valve are closed, and forcing equipment to automatically stop if one valve is not closed in place;
(2) taking the outlet conductance data of each mixing bed as an operation condition, and forcing equipment to stop operation when the other mixing beds are in a normal operation state and the outlet conductance is more than 0.2 mu s/cm; taking the outlet conductance detection value of the mixed bed as the running condition: when the mixed bed is in a normal operation state and the water outlet conductance is more than 0.2 mu s/cm, the equipment is forced to stop operation. Thus, double insurance is arranged, and the safe operation of the mixed bed is ensured.
(3) Adjusting and optimizing the running state and running time of each step valve, wherein the optimized regeneration step of the mixed bed is as follows: backwashing layering, settling, draining, premixing, regenerating I, regenerating II, replacing, flushing, cleaning, draining, mixing, degreasing, filling water, washing draining, washing and refluxing, and relieving pressure.
All other valves were closed before regeneration premixing as a condition for opening the acid inlet valve. The following situations are avoided: firstly, if the water inlet valve is not closed tightly, the acid liquor flows backwards from the upper end of the mixing bed through the water inlet valve and enters the main water inlet pipe, and is mixed with other normally filtered mixing beds to pollute the water quality of effluent; secondly, if the backwashing water inlet valve is not tight, the acid water directly enters the main water inlet pipe through the backwashing water inlet valve, and the result is the same as that of the first step; thirdly, if the air inlet valve is not closed tightly, acid liquor enters the compressed air pipe through the valve, and other gas-using equipment can be damaged; and fourthly, if the water outlet valve is not closed tightly, the acid water directly enters the main water outlet pipe through the water outlet valve to pollute the main outlet water, so that water quality accidents are caused, and the consequences are more serious.
Aiming at the situation, the valve switch in-place signal is used as a necessary condition for system operation, a program is programmed, when the mixed bed is in regeneration and premixing, the backwashing water inlet valve, the mixed bed water inlet, the water production and the air inlet valve are confirmed to be closed, and if one valve is not closed in place, the equipment is forced to stop operation. And starting after the equipment fault is eliminated.
In the above regeneration method, the specific operation of step (3) is as follows:
1) backwash stratification (1800 s): close offA water outlet valve of the mixed bed is opened, an exhaust valve of the mixed bed is opened, an upper discharge valve is opened, a backwashing water inlet valve is opened, a water supply pump of the mixed bed is started, the opening degree of a manual valve of backwashing water inlet is adjusted, and the backwashing flow is 75m3/h-85m3/h；
2) Sedimentation (900 s): stopping the water supply pump of the mixed bed, closing the back washing water inlet valve of the mixed bed, confirming that the back washing water inlet valve of the mixed bed is in a closed state, and closing the upper discharge valve of the mixed bed;
3) drainage (580 s): opening a middle discharge valve of the mixed bed, confirming the opening degree of the middle discharge manual valve on site, and ensuring that the liquid level is 200mm +/-5 mm above the resin layer;
4) premix (60 s): confirming the closing of the water inlet valve, the water outlet valve, the backwashing water inlet valve and the air inlet valve of the mixed bed, opening the valve of the acid inlet pipe of the mixed bed, opening the valve of the alkali inlet pipe of the mixed bed, opening the water inlet valve of the acid ejector, opening the water inlet valve of the alkali ejector and starting the regeneration water pump, wherein the flow of the acid pre-ejection inlet is 25-30m3The flow rate of an alkali pre-injection inlet is 20-25m3H, the pre-injection time is 60 s;
the acid is hydrochloric acid, and the alkali is sodium hydroxide;
5) regeneration i (1500 s): opening an acid inlet valve of an acid ejector and an alkali inlet valve of an alkali ejector to keep the mass concentration of the acid regeneration liquid in the mixed bed to be 5% and the mass concentration of the alkali regeneration liquid to be 4%; the regeneration time is 1500 s;
6) regeneration ii (1200 s): closing an acid inlet valve of the acid ejector, confirming that the acid inlet valve of the acid ejector is closed, and adding alkali for the regeneration time of 1200 s;
in the regeneration step I, acid and alkali are regenerated simultaneously, and in the regeneration step II, alkali is regenerated;
7) substitution (2700 s): closing the alkali inlet valve of the alkali ejector, confirming that the alkali inlet valve of the alkali ejector is closed, enabling the middle exhaust valve to be in an open state, and setting the replacement time to be 2700 s;
8) rinsing (600 s): stopping the regeneration pump, closing the water inlet valve of the acid ejector, closing the water inlet valve of the alkali ejector, closing the valve of the acid inlet pipe of the mixed bed, closing the valve of the alkali inlet pipe of the mixed bed, confirming that the valves are closed, opening the water inlet valve of the mixed bed, enabling the middle discharge valve 11 (the middle discharge is the discharge of acid-alkali regeneration waste liquid in the regeneration process) to be in an open state, and starting the water supply pump of the mixed bed;
9) cleaning (600 s): opening a lower discharge valve of the mixed bed, closing a middle discharge valve, cleaning for 600s, and cleaning by using secondary desalted water at the upstream of the mixed bed;
10) drainage (480 s): stopping the mixed bed water supply pump, and draining 480s until the liquid level is 150-200 mm above the resin layer;
11) mixing (120 s): opening an air inlet valve of the mixed bed, closing a lower discharge valve of the mixed bed, and controlling the air inlet pressure of the mixed bed to be 0.1-0.2MPa and the mixing time to be 120 s;
12) defatting (120 s): opening a lower discharge valve and closing an air inlet valve of the mixed bed;
13) water filled (240 s): starting a water inlet valve of the mixed bed, starting a water supply pump of the mixed bed, and entering the next step when water is filled until a vent valve of the mixed bed has water overflow;
14) main wash drain (2500 s): closing an exhaust valve of the mixed bed, draining 2500s through a lower discharge valve, and opening a water outlet valve of the mixed bed;
15) forward wash reflux (3000 s): when the water is positively washed until the drainage conductivity is less than or equal to 10 mus/cm, the mixed bed reflux valve is opened, the mixed bed lower drainage valve is closed, when the water is positively washed until the drainage conductivity is less than or equal to 0.2 mus/cm, the mixed bed water supply pump is stopped, the mixed bed reflux valve is closed, and the mixed bed water inlet valve is closed;
16) pressure relief (30 s): and opening an exhaust valve of the mixing bed, and relieving pressure for 30s for later use.
TABLE 11 # -3# Mixed bed operation and regeneration sequences
The mixed bed regeneration control system of the four-film high-quality water production line of the Tai-Gai energy power plant tries out the control method. The three sets of mixing beds run in parallel, the three sets of mixing beds are periodically regenerated in turn according to time, and when one set of mixing bed is regenerated, the other two sets of mixing beds produce water normally. The operation and regeneration steps of the No. 1 mixed bed are shown in Table 1, and each step is operated according to the adjusted step, and the operation time can be properly adjusted according to the condition of the mixed bed. In order to prevent acid channeling, when premixing is started, other valves are required to be completely closed, only an acid inlet and alkali inlet valve is opened, in the command of opening the acid inlet valve, backwashing water inlet valve, normal water inlet, water production and in-place closing condition of an air inlet valve are added, any valve in-place closing signal does not return, the acid inlet valve opening command cannot be sent, and after the time exceeds 5s, the mixed bed is regenerated and automatically stopped. After the valve fault is processed, the operation can be continued.
Claims (5)
1. A high-efficiency mixed bed regeneration method is characterized by comprising the following steps:
(1) increasing the operation conditions in the mixed bed regeneration step: before regeneration I begins, confirming that a backwashing water inlet valve, a water outlet valve and an air inlet valve are closed, and if one valve is not closed in place, forcing the equipment to automatically stop;
(2) taking the outlet conductance data of each mixing bed as an operation condition, and forcing equipment to stop operation when the other mixing beds are in a normal operation state and the outlet conductance is more than 0.2 mu s/cm;
(3) adjusting and optimizing the running state and running time of each step valve, wherein the optimized regeneration step of the mixed bed is as follows: backwashing layering, settling, draining, premixing, regenerating I, regenerating II, replacing, flushing, cleaning, draining, mixing, degreasing, filling water, washing draining, washing and refluxing, and relieving pressure.
2. The efficient mixed bed regeneration method of claim 1, wherein: taking a valve switch in-place signal as a necessary condition for system operation, programming, confirming that a backwashing water inlet valve, a mixed bed water inlet valve, a water production valve and an air inlet valve are closed before the mixed bed is regenerated and premixed, and forcibly stopping the equipment if one valve is not closed in place; and starting after the equipment fault is eliminated.
3. The efficient mixed bed regeneration method of claim 1, wherein: the run time for each step is: the backwashing layering time is 1800 s; the settling time is 900 s; the drainage time is 580 s; the premixing time is 60 s; the regeneration I time is 1500 s; the regeneration II time is 1200 s; the replacement time was 2700 s; the rinsing time was 600 s; the cleaning time is 600 s; the drainage time is 480 s; the mixing time was 120 s; the fat dropping time is 120 s; the water filling time is 240 s; the water drainage time of the main washing is 2500 s; the forward washing reflux time is 3000 s; the pressure relief time was 30 s.
4. The efficient mixed bed regeneration method of claim 1, wherein: the specific operation of the step (3) is as follows:
1) backwashing and layering: closing a water outlet valve of the mixed bed, opening an exhaust valve of the mixed bed, opening an upper discharge valve, opening a backwashing water inlet valve, starting a water supply pump of the mixed bed, adjusting the opening of a manual valve of backwashing water inlet, wherein the backwashing flow is 75m3/h-85m3/h；
2) And (3) settling: stopping the water supply pump of the mixed bed, closing the back washing water inlet valve of the mixed bed, confirming that the back washing water inlet valve of the mixed bed is in a closed state, and closing the upper discharge valve of the mixed bed;
3) draining: opening a middle discharge valve of the mixed bed, confirming the opening degree of the middle discharge manual valve on site, and ensuring that the liquid level is 200mm +/-5 mm above the resin layer;
4) premixing: confirming the closing of the water inlet valve, the water outlet valve, the backwashing water inlet valve and the air inlet valve of the mixed bed, opening the valve of the acid inlet pipe of the mixed bed, opening the valve of the alkali inlet pipe of the mixed bed, opening the water inlet valve of the acid ejector, opening the water inlet valve of the alkali ejector and starting the regeneration water pump, wherein the flow of the acid pre-ejection inlet is 25-30m3The flow rate of an alkali pre-injection inlet is 20-25m3H, the pre-injection time is 60 s;
5) regeneration I: opening an acid inlet valve of an acid ejector and an alkali inlet valve of an alkali ejector to keep the mass concentration of the acid regeneration liquid in the mixed bed to be 5% and the mass concentration of the alkali regeneration liquid to be 4%; the regeneration time is 1500 s;
6) and (2) regeneration II: closing an acid inlet valve of the acid ejector, confirming that the acid inlet valve of the acid ejector is closed, and adding alkali for the regeneration time of 1200 s;
7) and (3) replacement: closing the alkali inlet valve of the alkali ejector, confirming that the alkali inlet valve of the alkali ejector is closed, enabling the middle exhaust valve to be in an open state, and setting the replacement time to be 2700 s;
8) washing: stopping the regeneration pump, closing a water inlet valve of the acid ejector, closing a water inlet valve of the alkali ejector, closing a valve of an acid inlet pipe of the mixed bed, closing a valve of a alkali inlet pipe of the mixed bed, confirming that the valves are closed, opening the water inlet valve of the mixed bed, opening a middle discharge valve, and starting a water supply pump of the mixed bed;
9) cleaning: opening a lower discharge valve of the mixed bed, closing a middle discharge valve, and cleaning for 600s by using secondary desalted water at the upstream of the mixed bed;
10) draining: stopping the mixed bed water supply pump, and draining 480s until the liquid level is 150-200 mm above the resin layer;
11) mixing: opening an air inlet valve of the mixed bed, closing a lower discharge valve of the mixed bed, and controlling the air inlet pressure of the mixed bed to be 0.1-0.2MPa and the mixing time to be 120 s;
12) fat dropping: opening a lower discharge valve and closing an air inlet valve of the mixed bed;
13) filling water: starting a water inlet valve of the mixed bed, starting a water supply pump of the mixed bed, and entering the next step when water is filled until a vent valve of the mixed bed has water overflow;
14) direct washing and draining: closing an exhaust valve of the mixed bed, draining 2500s through a lower discharge valve, and opening a water outlet valve of the mixed bed;
15) forward washing and refluxing: when the water is positively washed until the drainage conductivity is less than or equal to 10 mus/cm, the mixed bed reflux valve is opened, the mixed bed lower drainage valve is closed, when the water is positively washed until the drainage conductivity is less than or equal to 0.2 mus/cm, the mixed bed water supply pump is stopped, the mixed bed reflux valve is closed, and the mixed bed water inlet valve is closed;
16) pressure relief: and opening an exhaust valve of the mixing bed, and relieving pressure for 30s for later use.
5. The efficient mixed bed regeneration method of claim 4, wherein: the acid is hydrochloric acid, and the alkali is sodium hydroxide.
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| CN113546691A (en) * | 2021-07-26 | 2021-10-26 | 北京百灵天地智慧环境科技有限公司 | Weak acid resin softening bed regeneration system and regeneration method |
| CN115364907A (en) * | 2022-02-17 | 2022-11-22 | 无锡市新永大环保设备有限公司 | Mixed bed cation-anion resin backwashing layering method |
| WO2023071140A1 (en) * | 2021-10-27 | 2023-05-04 | 华能国际电力股份有限公司大连电厂 | Remote monitoring system and method for resin conveying of condensed water fine treatment system |
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Application publication date: 20210223 |