CN103910422B - A kind of intelligence joins the algorithm that alum is thrown alum method and joined alum concentration and liquid level - Google Patents

Abstract

The invention discloses an intelligent alum mixing and feeding method and an algorithm for mixing alum concentration and liquid level, based on an intelligent alum mixing and feeding system experience database and an intelligent algorithm, with a PLC controller as the control core component, and an industrial computer as the control unit. Man-machine interface equipment, automatically mixes alum and throws alum. The intelligent alum distribution system includes PLC controller, automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve, raw alum pump, raw alum tank, high-level alum tank, mixer, raw alum pipe, water inlet pipe, and raw alum tank liquid level gauge , High-level alum pool liquid level gauge and alum outlet pipe. The invention realizes the automation of the dosing system, reduces the labor intensity of workers, improves the configuration of the coagulant and the accuracy of alum injection, and is beneficial to improve the water quality of water supply; the dosage is more accurate and economical, and the actual control effect is more intelligent. Greatly improve the reliability and safety of the alum feeding system. It ensures that the waterworks can save energy, reduce consumption and increase efficiency, and its economic and social benefits are very significant.

Description

An intelligent alum mixing and feeding method and an algorithm for mixing alum concentration and liquid level

technical field

The invention relates to the technical field of tap water production, in particular to an intelligent alum mixing and feeding method and an algorithm for mixing alum concentration and liquid level.

Background technique

Conventional alum addition process in modern water purification plants mainly includes: flocculant configuration, dosing, mixing, reaction, flocculation, etc. The system is mainly composed of automatic alum distribution system, dosing system and other parts.

Coagulation is the most important treatment process in the water purification system, and it is also the main component of the cost of water production. Whether the dosage of coagulant is accurate or not directly affects the whole process of water treatment. In addition, the consumption of chemicals is also the cost of water production. The main components of the dosing and precipitation process directly affect the final water quality and treatment costs.

At present, most of the alum distribution methods in domestic water plants are manual alum distribution, which consists of a raw alum tank, a high-level alum tank, a manual control valve, a water injector, an electronic clock and a dosing pipeline. The alum mix is measured by a small metering pool and an electronic clock, and the raw alum is added to the high-level alum pool by a pump and a water injector, and then the concentration of the alum solution is determined by a laboratory test.

Adding alum is usually done by metering pump or gravity + manual control valve.

Alum is manually mixed. This way of mixing alum requires the on-duty personnel to pay attention to the level of adding liquid at all times to prevent overflow of alum, and it is difficult to control the concentration of alum.

The dosing method of the metering pump uses the frequency and stroke of the metering pump as the indirect control parameters of the alum flow control, and part of the flow current meter is used for feedback control. The metering pump throwing alum system is shown in Figure 1. The dosing amount can be automatically controlled with more experience, but the control accuracy is not high, and the observation level and on-site work experience of the on-duty personnel are relatively high, and the maintenance required for the equipment is relatively large. At the same time, according to actual use experience, the accuracy and stability of the feedback value of the flowing current meter need to be improved, and the failure rate and maintenance work of the equipment are relatively high; there is a serious nonlinearity between the frequency and stroke of the metering pump and the theoretical flow rate, when the metering pump After the diaphragm deteriorates, the flow rate will be greatly reduced, endangering production safety.

Gravity + manual control valve mode, usually equipped with a corresponding rotameter for crop dosage feedback, the dosage can be precisely controlled. However, this method requires the dosing staff to estimate the amount of alum based on experience, and can only be manually operated on site, which makes the alum injection personnel a lot of work. They must always pay attention to the source water flow and turbidity changes to adjust the valve, and it is easy to produce Human error.

After retrieval, in the prior art, the invention patent "automatic control algorithm of tap water coagulation alum injection" ( CN101556458) discloses an automatic control algorithm of tap water coagulation alum injection based on artificial neural network for feedforward control and fuzzy feedback control. It includes: learning the process parameters of the input control through the artificial neural network, identifying the internal corresponding relationship among the system parameters, so as to predict the control value of the core's detection source water parameters, and then use the method of fuzzy control feedback to predict the value Make corrections, and finally get a control amount of alum that meets the needs to control the work of the metering pump, and complete the whole process of alum control. The utility model "an executive mechanism for coagulation and alum injection in tap water" ( CN201942549U ) discloses an actuator for coagulation and alum injection in tap water, which belongs to the field of automatic control. The actuator is arranged between the alum inlet pipe and the alum outlet pipe, the actuator includes a centrifugal pump, an electronic regulating valve, a flow controller and a flow meter, the inlet of the centrifugal pump is connected with the alum inlet pipe, The outlet of the centrifugal pump is connected to the alum outlet pipe through the electronic regulating valve and the flow meter, and the electronic regulating valve, the flow controller and the flow meter form a flow control loop. The utility model "Electronic Regulating Valve Special for Gravity Self-flowing Alum" ( CN201407362 ) discloses an electronic regulating valve for gravity self-flowing alum. The front end of the valve stem is connected to the valve core, the upper end of the valve core is provided with a horizontal limit and a sealing boss, and a sealing plunger is arranged under the boss, and the sealing plunger has a contraction angle not greater than 2° downward; the movement of the sealing plunger The stroke is 25mm≥H≥16mm; the diameter of the sealing hole on the upper surface of the valve seat is D≤10mm. "Automatic emergency treatment device for breaking alum in tap water production" ( CN201338959 ) The utility model discloses an automatic emergency treatment device for breaking alum in tap water production, which includes a main supply pump for alum solution, an auxiliary supply pump for alum solution, and a main supply pump for alum solution and /or the alum solution auxiliary supply pump is connected to the alum solution supply pipe of China Unicom, the alum solution supply pipe is provided with an alum solution flowmeter, and the signal output of the alum solution flowmeter is connected to the programmable automation controller; The signal output end is connected to the opening and closing control end of the alum solution auxiliary supply pump; the programmable automatic controller is used for automatic control of the action of the alum solution main supply pump and the alum solution auxiliary supply pump. "Pulsating automatic alum feeding machine" ( CN2551637) discloses a pulsating automatic alum feeding machine capable of executing electrical signals. The pressure water solenoid valve is installed on the water inlet pipe of the water ejector, and is connected in parallel with the clean water valve; the clean water valve is connected in series with the clean water solenoid valve; the manual alum valve, flow meter, and check valve are connected in parallel with the clean water solenoid valve in sequence. Then it is connected to the water injector; the buffer is installed horizontally on the liquid outlet pipe of the water injector. Above prior art, all do not overcome alum in tap water production well and add alum automation degree is low, the drawback that the workman's labor intensity is big, it is necessary to improve further.

Contents of the invention

The technical problem to be solved by the present invention is to provide an intelligent method for alum distribution and alum distribution and an algorithm for alum concentration and liquid level, which can overcome the disadvantages of low automation of alum distribution and alum addition and high labor intensity of workers in tap water production , improve the configuration of coagulant and the accuracy of alum injection, better respond to changes in source water quality, and further improve the safety and reliability of water supply.

The technical scheme adopted in the present invention is:

An intelligent alum distribution and alum feeding method, based on the experience database and intelligent algorithm of the intelligent alum distribution and alum feeding system, with a PLC controller as the control core component, and an industrial computer or a touch screen as a man-machine interface device to automatically calculate and control the alum liquid The liquid level, concentration, alum dosage; include the following steps:

Step 1: Automatically mix alum under the control of PLC controller, the main process is as follows:

(1) Turn on the power, turn on the PLC controller, and select the alum distribution mode; determine the raw alum pool for alum distribution;

(2) Record the concentration and liquid level of the alum solution in the current high-level alum pool; read the set concentration and set liquid level of the alum;

(3) Calculation of alum concentration and alum liquid level: through the PLC controller, based on the experience database and intelligent algorithm of the intelligent alum distribution system, determine the ratio of raw alum and water according to the relevant parameters of raw alum and water, Calculate the liquid level and concentration of mixed alum in the high-level alum pool;

(4) Start the raw alum pump to lift the raw alum from the raw alum pool to the high-level alum pool;

(5) Read the value of the liquid level gauge in the high-level alum tank, and stop the raw alum pump after the raw alum level in the high-level alum pool reaches the set value;

(6) Turn on the water filling solenoid valve on the water inlet pipe on the high level alum pool to discharge water, read the value of the high level alum pool liquid level gauge, drain water until the liquid level in the high level alum pool reaches the predetermined value, and close the water filling solenoid valve;

(7) Start the mixer to work, stir, and stop stirring after reaching the predetermined time;

(8) Complete the work of mixing alum;

Step 2: Alum is automatically fed under the control of the PLC controller. The main process is as follows:

(1) According to the relevant parameters of the source water, through the PLC controller, based on the experience database and intelligent algorithm of the intelligent alum distribution system, the alum consumption and the theoretical alum flow rate are calculated;

(2) Select the control mode and determine the required alum dosage;

(3) Start to add alum, and control the opening of the automatic regulating valve through the PID control program, according to the current alum dosage and feedback signal, so as to control the alum dosage;

(4) Complete the work of throwing alum.

In the above method, an intelligent alum distribution and alum feeding system is adopted for automatic alum distribution and alum feeding. The intelligent alum distribution and alum feeding system includes a PLC controller, a raw alum pool, a raw alum pipe, a raw alum pump, a high-position alum pool, a mixer, Alum outlet pipe, automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve, water inlet pipe, raw alum pool level gauge, high level alum pool level gauge, source water flow meter, source water turbidity meter and source water sampling pipe;

Connect the original alum pool, the original alum pump and the high-position alum pool through the original alum pipe, connect the high-position alum pool, the automatic regulating valve and the electromagnetic flowmeter through the alum outlet pipe, and connect the water-adding solenoid valve and the high-position alum pool with the water inlet pipe; The mixer is installed on the high-level alum tank; the source water flow meter and the source water turbidity meter are installed on the source water sampling pipe; Pool level gauge; the water adding solenoid valve, raw alum pump, mixer, raw alum pool level gauge, high level alum pool level gauge, source water flow meter, source water turbidity meter, automatic regulating valve and electromagnetic flowmeter are all It is electrically connected with the PLC controller.

The PLC controller is equipped with various intelligent modules such as alum dosage calculation and control module, alum liquid concentration calculation module, alum pool liquid level control module and PLC controller with fault processing module. The fault processing module includes a signal abnormal processing module; when a problem occurs in the equipment, the fault processing module will report to the police in time, and record the alarm information, and automatically switch to normal alum distribution and alum injection; when the high-level alum pool level gauge fluctuates abnormally due to interference When the abnormality processing module starts the abnormality processing algorithm, the interference data is corrected in time; when the source water turbidity meter or source water flow meter fails, the fault processing module will alarm in time, and start the emergency dosing program, and add alum according to the historical data before the fault. .

The above-mentioned intelligent alum distributing and feeding system also includes a manual control box installed in the electrical part, a filter and a backwash anti-clogging valve; the filter and the backwash anti-clogging valve are installed on the alum outlet pipe adjacent to the high-level alum tank.

In the above-mentioned intelligent alum distribution and alum input method, the alum distribution mode includes central control inching and PLC automatic.

In the above-mentioned intelligent alum distribution method, the mixer workflow includes:

(1) Select the working mode of the mixer, select PLC automatic;

(2) Confirm that the mixer is in the remote position, the mixer has no fault signal, and the mixer is in the PLC automatic position;

(3) Start the program and start the mixer;

(4) Determine whether the mixer is faulty;

(5) The timer counts, and the mixer is turned off after five minutes.

In the above-mentioned intelligent alum mixing method, a special concentration calculation method is adopted when calculating the concentration of alum (that is, the concentration of the diluted alum solution), and the calculation method of the concentration of alum comprises:

(1) The raw alum pump is turned on;

(2) Record the concentration and liquid level of raw alum in the raw alum pool currently used for alum mixing;

(3) Use the following formula to calculate the concentration of mixed alum: mixed alum concentration = raw liquid level of raw alum pool * original concentration of raw alum pool * 1300.0/(1300.0-3.0* current concentration of raw alum pool) + (current liquid level of raw alum pool - raw liquid level )*100.0*1.3)/(liquid level of raw alum pool)*1300.0/(1300.0-3.0*concentration of raw alum pool)+(current liquid level of raw alum pool-raw liquid level of raw alum pool)*1.3).

In the above intelligent alum mixing method, when calculating the alum liquid level, the following formula is used to calculate the raw alum liquid level to be added (that is, in the high-level alum tank, the liquid level after adding the required raw alum and the high level The difference between the original alum liquid level in the alum pool): the level of raw alum that needs to be added = the concentration setting value of the original alum pool * the setting value of the alum concentration / (K1-3.0 * the setting value of the alum concentration * 10.0) - alum The current concentration of the pool * the current liquid level of the alum pool / (K1-3.0 * the current liquid level of the alum pool * 10.0); (where K1 is the specific gravity coefficient of the original alum);

Described alum consumption calculation adopts following formula:

When NTU_Y<=N1, calculate alum consumption (Kg/m ³ )=20.0-(N1-NTU_Y)*J1;

When N1<NTU_Y<=N2, calculate alum consumption (Kg/m ³ )=20.0+(NTU_Y-N2)*J2

Among them, N1, N2, J1, and J2 come from the corresponding table of empirical data, NTU represents turbidity, and NTU_Y represents the turbidity value of source water;

Calculate the theoretical dosage of alum according to the alum consumption:

Calculation formula for adding alum flow:

Theoretical alum dosing flow (L ³ ) = calculated alum consumption * control coefficient * Q alum (m ³ ) * 0.001*0.1* (K2-3.0* current dosing alum concentration)/K2/current dosing alum concentration;

Current dosing alum consumption (Kg/m ³ )=dosing alum concentration*10.0*K2/(K2-3.0*dosing alum concentration)*current dosing alum flow rate*1000000.0/dosing alum concentration;

(Wherein K2 is the specific gravity coefficient of alum, and Q alum refers to the electromagnetic flowmeter reading about alum).

An algorithm for mixing alum concentration and liquid level, in the alum mixing and feeding process of tap water production, through the PLC controller, based on the experience database and intelligent algorithm of the intelligent mixing and feeding system, according to the relevant parameters of raw alum and water Determine the proportional relationship between raw alum and water, and calculate the liquid level and concentration of mixed alum in the high-level alum pool.

The above-mentioned algorithm of alum concentration and liquid level can adopt the following formula to calculate the required alum concentration:

Mixed alum concentration=raw liquid level of raw alum pool*original concentration of raw alum pool*1300.0/(1300.0-3.0*current concentration of raw alum pool)+(current liquid level of raw alum pool-raw liquid level)*100.0*1.3)/(raw alum pool liquid level)*1300.0/(1300.0-3.0*concentration of raw alum pool)+(current liquid level of raw alum pool-original liquid level of raw alum pool)*1.3).

For the above-mentioned algorithm of mixing alum concentration and liquid level, when calculating the mixing alum liquid level, the following formula is used to calculate the raw alum liquid level to be added: the raw alum liquid level to be added = the concentration setting value of the raw alum pool * the mixing alum setting liquid / (K1-3.0*setting value of alum concentration*10.0)-current concentration of alum pool*current liquid level of alum pool/(K1-3.0*current liquid level of alum pool*10.0); (where K1 is the specific gravity coefficient of raw alum).

The present invention also provides an installation method for an intelligent alum distribution and feeding system. The intelligent distribution and feeding system includes an integrated alum distribution and feeding control cabinet, a raw alum tank, a high-level alum tank, a mixer, a raw alum pipe, a valve, Water inlet pipe, raw alum pool level gauge, high level alum pool level gauge, source water flow meter, source water turbidity meter, source water sampling pipe, alum outlet pipe and manual control box;

The integrated alum distribution control cabinet includes a cabinet body, an electrical part located at the upper part of the cabinet body and a pipeline equipment part located at the lower part of the cabinet body, the electrical part includes a PLC controller, electrical components, and a touch screen, and the touch screen is installed On the surface of the cabinet; the pipeline equipment part includes an automatic regulating valve, an electromagnetic flowmeter, a water adding electromagnetic valve and a raw alum pump;

Connect the raw alum tank, raw alum pump, valve and high-level alum tank in sequence through the raw alum pipe; Alum pool; the mixer is installed on the high-level alum pool; the source water flow meter and the source water turbidity meter are installed on the source water sampling pipe; The pool is equipped with a high-level alum pool level gauge; the water adding solenoid valve, raw alum pump, mixer, raw alum pool level gauge, high-level alum pool level gauge, source water flow meter, source water turbidity meter, automatic regulating valve Both the electromagnetic flowmeter and the PLC controller are electrically connected;

The specific installation steps include:

Step 1: Prepare the raw alum pool and high-level alum pool;

Step 2: Install the integrated alum distribution control cabinet: pre-install the control program in the PLC controller, including the concentration calculation program for automatically calculating the concentration of alum liquid, the program for automatically calculating and controlling the alum dosage, and the fault handling module; Install the PLC controller, touch screen, electrical components, and manual control box on the upper part of the cabinet, among which, the touch screen is installed on the surface of the cabinet, and the automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve and raw alum pump are installed on the inside of the cabinet. In the lower part, use the alum outlet pipe to connect the automatic regulating valve and the electromagnetic flowmeter; use wires to connect the water adding solenoid valve, raw alum pump, automatic regulating valve and electromagnetic flowmeter with the PLC controller;

Step 3: Use the raw alum pipe to connect the raw alum tank, the raw alum pump, the valve and the high-level alum tank in sequence, and use the alum outlet tube to connect the high-level alum tank, the automatic regulating valve in the control cabinet and the electromagnetic flowmeter in sequence , use the water inlet pipe to connect the water filling solenoid valve and the high-level alum pool in the control cabinet in turn;

Step 4: Install the mixer on the high-level alum tank; install the source water flow meter and source water turbidity meter on the source water sampling pipe; install the original alum tank level gauge on the original alum tank, and install the high-level alum tank pool level gauge;

Step 5: Electrically connect the mixer, raw alum pool level gauge, high-level alum pool level gauge, source water flow meter, and source water turbidity meter to the PLC controller; connect the mixer, raw alum pump and manual control box The control lines are connected separately;

Step 6: Install valves in the alum outlet pipe and the original alum pipe, and install a filter and backwash anti-blocking valve on the alum outlet pipe adjacent to the high-level alum tank;

Step 7: Debug and complete the installation.

The beneficial effects of the present invention are:

1. Compared with the manual control mode of adding alum in the past, the automation of the dosing system is realized through the dosing control algorithm, which reduces the labor intensity of workers, improves the configuration of coagulant and the accuracy of alum dosing, and is conducive to improving the quality of water supply.

2. Compared with the previous method of relying on the technology and experience of operators, through the establishment of a database of alum dosage under various conditions and environmental changes, the dosage is more accurate, economical, and the actual control effect is more intelligent.

3. Compared with the manual inspection method in the past, the reliability and safety of the alum casting system are greatly improved by establishing the data, the industrial computer (touch screen) alarm and video monitoring system of the equipment operation status.

4. Guarantee the water plant to achieve energy saving, efficiency increase and production safety, and its economic and social benefits are very significant. the

Description of drawings

Fig. 1 is a metering pump throwing alum system in the prior art;

Figure 2 is a schematic diagram of the connection mode of each component of the intelligent alum distribution system (without the integrated intelligent alum distribution and alum control cabinet);

Fig. 3 is a structural schematic diagram of an integrated intelligent alum distribution and alum throwing control cabinet;

Fig. 4 is a schematic diagram of the connection mode of each component of the alum distributing and feeding system (with an integrated intelligent distributing and feeding control cabinet) of the present invention.

In the figure: 1. Raw alum tank, 2. Electric valve, 3. Manual maintenance valve, 4. Raw alum pipe, 5. Water adding solenoid valve, 6. Check valve, 7. Raw alum pump, 8. High alum pool, 9. Alum outlet pipe, 10. Electromagnetic flowmeter, 11. Automatic regulating valve, 12. PLC controller, 13. Touch screen, 14. Cabinet body.

Detailed ways

The present invention is based on the experience database and intelligent algorithm of the intelligent alum distributing and feeding system, the PLC is the control core component, the industrial computer or the touch screen is used as the man-machine interface device, and alum is mixed and fed in combination with system equipment such as distributing alum and feeding alum.

As shown in Figure 2, the intelligent alum distribution system includes PLC controller, raw alum tank 1, electric valve 2, manual maintenance valve 3, raw alum pipe 4, water adding solenoid valve 5, check valve 6, raw alum pump 7 , high level alum pool 8, alum outlet pipe 9, electromagnetic flowmeter 10, automatic regulating valve 11, mixer, water inlet pipe, raw alum pool level gauge, high level alum pool level gauge, source water flow meter, source water turbidity meter , Source water sampling tube. (Some equipment is not shown in the figure)

Connect the raw alum tank, electric valve, manual maintenance valve, raw alum pump, check valve and high-level alum tank in sequence through the raw alum pipe, and connect the high-level alum tank, automatic regulating valve and electromagnetic flowmeter through the alum outlet pipe in sequence; The water pipes are connected to the water-adding solenoid valve and the high-level alum tank in turn; the mixer is installed on the high-level alum tank; the source water flow meter and the source water turbidity meter are installed on the source water sampling pipe; the original alum tank is installed with a raw alum Pool level gauge, the high level alum pool is equipped with a high level alum pool level gauge; the water adding solenoid valve, raw alum pump, mixer, raw alum pool level gauge, high level alum pool level gauge, source water flow meter, The source water turbidity meter, the automatic regulating valve and the electromagnetic flowmeter are all electrically connected with the PLC controller. The specific layout of various pipelines such as raw alum pipe, alum outlet pipe, water inlet pipe and source water sampling pipe can be determined according to actual needs.

The raw alum pump includes 1# raw alum pump and 2# raw alum pump; the described raw alum pool includes 1# raw alum pool, 2# raw alum pool and 3# raw alum pool, and the high position alum pool includes 1# High level alum pool and 2# high level alum pool.

PLC controller with fault processing module. When there is a problem with the equipment (such as raw alum pump, solenoid valve, regulating valve, alum adding flowmeter), it will alarm in time and record the alarm information, and the control cabinet will automatically switch to the trouble-free one (there are 2 presets), ensuring Normal with alum, cast alum. The fault processing module comes with a signal abnormal processing module. When the high-level alum pool level gauge fluctuates abnormally due to interference, the abnormal processing algorithm is started, and the interference data can be corrected in time according to the trend of alum or water supply to ensure the normality and concentration of alum. of precision. When the source water turbidity meter or the source water flow meter fails, the control cabinet will alarm in time, and start the emergency dosing program, and add alum in a short period of time according to the historical data before the failure, so as to ensure that the water plant will not be out of alum. Guarantee the safe water supply of the water plant.

The alum distribution control is composed of PLC as the core. For each control object (valve or pump), there are on-site manual, remote jog, and automatic operation modes, which are convenient for installation, commissioning and maintenance of equipment.

The components are further described below.

Raw alum pump: used to send raw alum to the high-level alum pool to mix with water for dilution and dispensing. There are 2 sets of equipment (one for use and one for standby)

Raw alum level gauge: record the amount of raw alum consumed, the data is involved in the calculation of the alum distribution formula, and the control system prompts the on-duty personnel.

Water adding solenoid valve: Control adding water to dilute the raw alum.

High-level alum pool liquid level gauge: measure the liquid level of the high-level alum pool, calculate the liquid level of the dosing raw alum and the liquid level of the water distribution by the alum distribution algorithm, and control the action of the alum pump and the water adding solenoid valve through the liquid level signal.

High-level alum pool: the diluted alum pool, which stores the diluted alum solution. The alum solution is lifted from the original alum pool to the high-level alum pool for dilution by a lift pump, and stirred by a mixer, which can be controlled remotely or on site.

Automatic dispensing process and operating instructions:

1. Alum distribution mode selection (central control jog/PLC automatic)

2. If you choose PLC automatic, then judge whether the following conditions are true:

1# Raw alum lifting pump is at the remote location, 1# Raw alum pump is not faulty, the electromagnetic is at the remote location, the host computer interface alum distribution system is at the PLC automatic position, 1# high-level alum pool liquid level gauge is not faulty, the raw alum pool liquid level Greater than the lower limit, 1# alum tank is not in the state of alum mixing;

The 2# raw alum lifting pump is at the remote location, the 2# raw alum pump is free of fault, the electromagnetic is at the remote location, the alum distribution system of the host computer interface is at the PLC automatic position, the 2# high-level alum tank liquid level gauge is not faulty, and the raw alum tank liquid level Greater than the lower limit, 2# alum pool is not in the state of alum mixing;

3. If it is not established, the equipment failure alarm will be issued, and the upper computer will prompt to switch the original alum pool; if it is established, the 1# and 2# alum pools will be ready.

4. Start the alum distribution, set whether to switch the alum pool (default switch)

5. Record the concentration and liquid level (mm) of the current high-level alum pool, read the set concentration and set liquid level (mm) of alum.

6. Calculate the liquid level of raw alum that needs to be added (that is, in the high-level alum pool, the difference between the liquid level after adding the required raw alum and the original alum liquid level in the high-level alum pool): the level of raw alum that needs to be added =Concentration setting value of original alum pool*mixing alum setting liquid/(K1-3.0*setting value of mixing alum concentration*10.0)-current concentration of alum pool*current liquid level of alum pool/(K1-3.0*current alum pool liquid bit*10.0); (where K1 is the specific gravity coefficient of raw alum).

7. Judging whether the height of raw alum added is within the normal range (greater than 0 and less than the set liquid level), then start the raw alum pump, otherwise return to step 2.

8. Determine whether there is alum pool failure. If yes, go back to step 2, otherwise go to the next step.

9. Determine whether the liquid level has reached the level of adding raw alum, if so, go to the next step, otherwise:

If the timer counts and determines that the liquid level has not changed, it will prompt the raw alum pipeline to alarm, and return to step 2.

10. Stop the raw alum pump and open the solenoid valve for adding water.

11. Determine whether the set liquid level is reached, if yes, go to the next step, otherwise:

If the timer counts and determines that the liquid level has not changed, it will prompt an alarm for the water adding pipeline, and return to step 2.

12. Close the water filling solenoid valve.

13. The blender starts the program.

14. End.

About mixer working mode selection:

1. Select the working mode of the mixer (central control jog/PLC automatic), if you choose PLC automatic, proceed to the next step.

2. Confirm that the mixer is in the remote position, the mixer has no fault signal, and the mixer is in the PLC automatic position.

3. Proceed to the next step in any of the following cases:

⑴ The liquid level of the high-level alum pool is greater than 0.8 meters, and the interval is 30 minutes.

⑵ Automatically start after mixing alum.

4. The blender starts the program.

5. Start the blender.

6. Fault judgment of the mixer: if yes, the upper computer will alarm, otherwise go to the next step;

7. Time the timer and turn off the mixer after 5 minutes.

About the calculation method of the concentration of alum (that is, the concentration of the diluted alum solution):

1. The raw alum pump is turned on;

2. Record the concentration and liquid level of the current high level alum pool;

3. Calculation of alum concentration: concentration of alum concentration = original liquid level of alum pool * original concentration of alum pool * 1300.0/(1300.0-3.0* current concentration of alum pool) + (current liquid level of alum pool - original liquid level) * 100.0 * 1.3)/( The liquid level of the original alum pool)*1300.0/(1300.0-3.0*the concentration of the original alum pool)+(the current liquid level of the alum pool-the original liquid level of the alum pool)*1.3).

The alum feeding system is mainly composed of PLC controller, high level alum tank (high position), automatic regulating valve, electromagnetic flowmeter, alum tank liquid level gauge, source water flow meter, turbidity meter and manual control box.

The components are further described below.

Automatic regulating valve: to control the dosage of alum liquid, the control method is to adjust the flow rate of the agent and the negative feedback of the flow rate. It can be controlled remotely and manually on site.

Electromagnetic flowmeter: read the flow rate of the dosing alum, and give feedback signal to the control valve at the same time.

High-level alum tank liquid level gauge: measure the liquid level of the high-level alum tank, and the data participate in the calculation and alarm of the alum-adding program.

Source water flow meter and source water turbidity meter: installed on the source water sampling pipe, the data participates in the program calculation

Manual control box: In local conditions, the raw alum pump, iron pump and mixer can be manually controlled on site.

The operation process of automatic alum feeding is:

1. Calculate the alum consumption based on the current source water turbidity.

Alum consumption is calculated using the following formula:

When NTU_Y<=N1, calculate alum consumption (Kg/m ³ )=20.0-(N1-NTU_Y)*J1;

When N1<NTU_Y<=N2, calculate alum consumption (Kg/m ³ )=20.0+(NTU_Y-N2)*J2

Among them, N1, N2, J1, and J2 come from the corresponding table of empirical data, NTU represents turbidity, and NTU_Y represents the turbidity value of source water.

2. Calculate the theoretical dosage of alum according to the alum consumption.

Calculation formula for adding alum flow:

Theoretical alum dosing flow (L ³ ) = calculated alum consumption * control coefficient * Q alum (m ³ ) * 0.001*0.1* (K2-3.0* current dosing alum concentration)/K2/current dosing alum concentration;

Current dosing alum consumption (Kg/m ³ )=dosing alum concentration*10.0*K2/(K2-3.0*dosing alum concentration)*current dosing alum flow rate*1000000.0/dosing alum concentration;

(Wherein K2 is the specific gravity coefficient of alum, and Q alum refers to the electromagnetic flowmeter reading about alum).

3. Select the control mode:

Central control jog → manually set the dosage of alum;

PLC automatic → program calculates the theoretical dosage;

4. The upper computer displays "the current required alum dosage";

5. The PID control program controls the opening of the automatic regulating valve according to the current alum dosage and the feedback signal, so as to control the alum dosage;

6. The upper computer displays "regulating valve opening";

7. If the specified flow cannot be adjusted within 10 minutes, the upper computer will alarm "regulating valve failure": (1) It may be that the pipeline is blocked;

(2) The regulating valve fails to operate;

8. Regularly open the program (to prevent the control valve from being blocked);

9. Small flow maintenance program (to prevent alum failure when replacing the unit);

An installation method of an intelligent alum distributing and feeding system. The intelligent alum distribution and feeding system includes an integrated alum distribution and feeding control cabinet, a raw alum tank, a high-level alum tank, a mixer, a raw alum pipe, a valve, a water inlet pipe, a raw alum tank liquid level gauge, and a high-level alum tank liquid level gauge , source water flow meter, source water turbidity meter, source water sampling pipe, alum outlet pipe and manual control box.

As shown in Figures 3 and 4, the integrated alum distribution control cabinet includes a cabinet body 14, an electrical part located at the upper part of the cabinet body and a pipeline equipment part located at the lower part of the cabinet body, and the electrical part includes a PLC controller 12. Electrical components, touch screen 13, the touch screen is installed on the surface of the cabinet; the pipeline equipment part includes automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve and raw alum pump; various joints are installed and connected at the bottom of the cabinet: The raw alum pipe joint, the water inlet pipe joint, the alum outlet pipe joint, the water distribution mixing well joint and the sedimentation tank joint; the electromagnetic flowmeter is connected to the alum outlet pipe joint through pipelines, and the automatic regulating valve is respectively connected to the water distribution mixing well joint and the water distribution mixing well joint and the sedimentation tank joint through pipelines Sedimentation tank joint (conveniently connect the alum outlet pipe to send the prepared raw alum to the dosing point), the water adding solenoid valve is connected to the water inlet pipe joint through the water pipe, and the raw alum pump is connected to the raw alum pipe joint through the pipeline. (Wherein, the automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve and raw alum pump in Fig. 3 are the automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve and raw alum pump in Fig. In the cabinet body, connect the original corresponding equipment with pipelines). The intelligent alum distribution system used in the above intelligent alum distribution method can also adopt this control cabinet mode: PLC controller, electrical components, touch screen, automatic regulating valve, electromagnetic flowmeter, water adding solenoid valve and raw alum pump, etc. The one-piece integrated installation is installed in the same cabinet to form the one-piece alum distribution control cabinet.

Use the raw alum pipe to connect the raw alum tank, raw alum pump, valve and high-level alum tank in sequence, use the alum outlet pipe to connect the high-level alum tank, automatic regulating valve and electromagnetic flowmeter in sequence, and use the water inlet pipe to connect the water adding solenoid valve and High-level alum tank; the mixer is installed on the high-level alum tank; the source water flow meter and the source water turbidity meter are installed on the source water sampling pipe; The alum pool is equipped with a high-level alum pool level gauge; the touch screen, water adding solenoid valve, raw alum pump, mixer, raw alum pool level gauge, high-level alum pool level gauge, source water flow meter, source water turbidity meter, Both the automatic regulating valve and the electromagnetic flowmeter are electrically connected with the PLC controller.

The installation method of described intelligent distribution alum throwing alum system comprises the steps:

Step 1: Prepare the raw alum pool and high-level alum pool;

Step 2: Install the integrated alum distribution control cabinet: pre-install the control program in the PLC controller, including the concentration calculation program for automatic calculation of the concentration of alum liquid, the program for automatic calculation and control of alum dosage; the PLC controller , touch screen, electrical components, and manual control box are installed on the upper part of the cabinet. Among them, the touch screen is installed on the surface of the cabinet, and the automatic regulating valve, electromagnetic flowmeter, water solenoid valve and raw alum pump are installed on the lower part of the cabinet. The alum pipe is connected to the automatic regulating valve and the electromagnetic flowmeter; the water adding solenoid valve, the raw alum pump, the automatic regulating valve and the electromagnetic flowmeter are connected to the PLC controller with wires;

Step 3: Use the raw alum pipe to connect the raw alum tank, the raw alum pump, the valve and the high-level alum tank in sequence, and use the alum outlet tube to connect the high-level alum tank, the automatic regulating valve in the control cabinet and the electromagnetic flowmeter in sequence , use the water inlet pipe to connect the water filling solenoid valve and the high-level alum pool in the control cabinet in turn;

Step 4: Install the mixer on the high-level alum tank; install the source water flow meter and source water turbidity meter on the source water sampling pipe; install the original alum tank level gauge on the original alum tank, and install the high-level alum tank pool level gauge;

Step 5: Electrically connect the mixer, raw alum pool level gauge, high-level alum pool level gauge, source water flow meter, and source water turbidity meter to the PLC controller; connect the mixer, raw alum pump and manual control box The control lines are connected separately;

Step 6: Install valves in the alum outlet pipe and the original alum pipe, and install a filter and backwash anti-blocking valve on the alum outlet pipe adjacent to the high-level alum pool;

Step 7: Debug and complete the installation.

The size and specific installation location of the integrated alum distribution and alum control cabinet can be determined according to actual needs, and then other equipment can be connected through pipelines. Arrangement and layout can be determined according to actual needs.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims (9)

1. an intelligence joins alum throwing alum method, join based on alum Dosing system experience database, intelligent algorithm by intelligence, take PLC as control core parts, adopt industrial computer or touch-screen as human interface device, automatically calculate and control liquid level, concentration, the alum dosage of alum liquid; Comprise the steps:

Step one: automatically carry out joining alum under PLC controls, main technique is as follows:

(1) switch on power, open PLC, select to join alum pattern; Determine the former alum pond of joining alum;

(2) alum liquid concentration, the liquid level in current high-order alum pond is recorded; Alum setting concentration, setting liquid level are joined in reading;

(3) calculating is joined alum concentration, is joined alum liquid level: pass through PLC, join based on alum Dosing system experience database, intelligent algorithm by intelligence, determine the proportionlity of former alum and water according to the relevant parameters of former alum and water, calculate in high-order alum pond and join alum liquid level, join alum concentration;

(4) start former alum pump, former alum is risen to high-order alum pond from former alum pond;

(5) read the numerical value of high-order alum pit level meter, after the former alum liquid level in high-order alum pond reaches set(ting)value, stop former alum pump;

(6) water solenoid valve that adds opened on the water inlet pipe on high-order alum pond discharges water, and reads the numerical value of high-order alum pit level meter, discharges water to the liquid level in high-order alum pond and reaches preset value, close and add water solenoid valve;

(7) start stirrer work, stir, after reaching the scheduled time, stop stirring;

(8) complete and join alum work;

Step 2: automatically carry out throwing alum under PLC controls, main technique is as follows:

(1) according to the relevant parameters of source water, by PLC, join based on alum Dosing system experience database, intelligent algorithm by intelligence, calculate alum consumption and theory add alum flow;

(2) select master mode, determine required alum dosage;

(3) start to throw alum, by PID sequence of control, control automatic regulating valve aperture according to current alum dosage and feedback signal, thus control alum dosage;

(4) work of throwing alum is completed.

2. intelligence according to claim 1 joins alum throwing alum method, it is characterized in that, adopt intelligence to join alum Dosing system automatically to join alum and throw alum, described intelligence joins that alum Dosing system comprises PLC, former alum pond, former alum pipe, former alum pump, high-order alum pond, stirrer, goes out alum pipe, automatic regulating valve, magnetic flow meter, adds water solenoid valve, water inlet pipe, former alum pit level meter, high-order alum pit level meter, source Water Flowmeters, source water turbidity instrument and source water sampling tube;

Connecting former alum pond, former alum pump and high-order alum pond by former alum pipe, connecting high-order alum pond, automatic regulating valve and magnetic flow meter by going out alum pipe, water inlet pipe connects and adds water solenoid valve and high-order alum pond; Described stirrer is arranged on high-order alum pond; Described source Water Flowmeters and source water turbidity instrument are arranged on the water sampling tube of source; Described former alum pond is provided with former alum pit level meter, and described high-order alum pond is provided with high-order alum pit level meter; Described water solenoid valve, former alum pump, stirrer, former alum pit level meter, high-order alum pit level meter, source Water Flowmeters, source water turbidity instrument, automatic regulating valve and the magnetic flow meter of adding all is electrically connected with PLC.

3. intelligence according to claim 2 joins alum throwing alum method, and it is characterized in that, described PLC is with alum dosage calculation and control module, alum liquid concentration calculation module, alum pit level control module and fault processing module.

4. intelligence according to claim 3 joins alum throwing alum method, and it is characterized in that, described fault processing module comprises abnormal signal processing module; When equipment goes wrong, fault processing module and alarm, and record alarm message, automatically switch to and normally join alum, throwing alum; When high-order alum pit level meter occurs unusual fluctuations because of interference, abnormality processing module starts abnormality processing algorithm, revises interfering data in time; When source water turbidity instrument or source water ga(u)ge break down, fault processing module and alarm, and start and emergent add program, throw alum according to historical data before fault.

5. intelligence according to claim 2 joins alum throwing alum method, it is characterized in that, also comprises the Non-follow control case, strainer and the back washing anti-blocking valve that are arranged on electric part; Described strainer and back washing anti-blocking valve installation go out on alum pipe contiguous high-order alum pond; Described join alum pattern comprise middle control crawl and PLC automatic.

6. intelligence according to claim 1 and 2 joins alum throwing alum method, and it is characterized in that, described stirrer workflow comprises:

(1) select stirrer operating mode, select PLC automatic;

(2) stirrer is confirmed at remote location, stirrer trouble free signal, stirrer at PLC automated location;

(3) opening program, starts stirrer;

(4) judge whether stirrer has fault;

(5), during timer, after five minutes, stirrer is closed.

7. intelligence according to claim 1 and 2 joins alum throwing alum method, it is characterized in that,

Calculate when joining alum concentration and adopt special density calculating method, described density calculating method comprises:

(1) former alum pump is opened;

(2) the current former alum concentration in former alum pond, liquid level for joining alum is recorded;

(3) following formulae discovery is adopted to join alum concentration: to join alum concentration=former alum pond stoste position * former alum pond original content * 1300.0/ (1300.0-3.0* current former alum pond concentration)+(current former alum pit level-stoste position) * 100.0*1.3/ (former alum pit level) * 1300.0/ (1300.0-3.0* former alum pond concentration)+(former alum pond current level-stoste position, former alum pond) * 1.3;

When alum liquid level is joined in calculating, the former alum liquid level adopting following formulae discovery to add: former alum liquid level=former alum pond concentration set point * need be added and join alum setting liquid level/(K1-3.0* joins alum concentration set point * 10.0)-alum pond existing concentration * current alum pit level/(K1-3.0* current alum pit level * 10.0); (wherein K1 is former alum specific gravity factor);

Described alum consumption calculates and adopts following formula:

Work as NTU_Y<=N1, calculate alum consumption (Kg/m ³)=20.0-(N1-NTU_Y) * J1;

Work as N1<NTU_Y<=N2, calculate alum consumption (Kg/m ³)=20.0+ (NTU_Y-N2) * J2

Wherein N1, N2, J1, J2 are from rule of thumb data correspondence table, and NTU represents turbidity, and NTU_Y represents source water turbidity value;

Calculate theory according to alum consumption and add alum flow:

Add alum flow rate calculation formula:

Theory adds alum flow (L ³)=calculate alum consumption * control coefficient * Q alum (m ³)/K2/ is current adds alum concentration for * 0.001*0.1* (K2-3.0* is current adds alum concentration);

The current alum that adds consumes (Kg/m ³the current alum flow * 1000000.0/ that adds of)=add alum concentration * 10.0*K2/ (K2-3.0* adds alum concentration) * adds alum concentration,

Wherein K2 is alum specific gravity factor, and Q alum refers to the magnetic flow meter reading about alum.

8. join the algorithm of alum concentration and liquid level for one kind, it is characterized in that, the alum of joining produced at tap water is thrown in alum technique, pass through PLC, join based on alum Dosing system experience database, intelligent algorithm by intelligence, determine the proportionlity of former alum and water according to the relevant parameters of former alum and water, calculate in high-order alum pond and join alum liquid level, join alum concentration;

Adopt and join alum concentration needed for following formulae discovery:

Join alum concentration=former alum pond stoste position * former alum pond original content * 1300.0/ (1300.0-3.0* current former alum pond concentration)+(current former alum pit level-stoste position) * 100.0*1.3/ (former alum pit level) * 1300.0/ (1300.0-3.0* former alum pond concentration)+(former alum pond current level-stoste position, former alum pond) * 1.3;

When alum liquid level is joined in calculating, the former alum liquid level adopting following formulae discovery to add: need add former alum liquid level=former alum pond concentration set point * and join alum setting liquid level/(K1-3.0* joins alum concentration set point * 10.0)-alum pond existing concentration * current alum pit level/(K1-3.0* current alum pit level * 10.0), wherein K1 is former alum specific gravity factor.

9. intelligence joins an installation method for alum Dosing system,

Described intelligence is joined alum Dosing system and is comprised integral type and join alum and throw alum housing, former alum pond, high-order alum pond, stirrer, former alum pipe, valve, water inlet pipe, former alum pit level meter, high-order alum pit level meter, source Water Flowmeters, source water turbidity instrument, source water sampling tube, go out alum pipe and Non-follow control case;

Described integral type is joined alum and is thrown alum housing and comprise cabinet, be positioned at the electric part on cabinet top and be positioned at the pipeline equipment part of cabinet bottom, and described electric part comprises PLC, electrical element, touch-screen, and described touch-screen is arranged on cabinet surface; Described pipeline equipment part comprises automatic regulating valve, magnetic flow meter, adds water solenoid valve and former alum pump;

Connecting former alum pond, former alum pump, valve and high-order alum pond successively by former alum pipe, connecting high-order alum pond, automatic regulating valve and magnetic flow meter successively by going out alum pipe, water inlet pipe connects successively and adds water solenoid valve and high-order alum pond; Described stirrer is arranged on high-order alum pond; Described source Water Flowmeters and source water turbidity instrument are arranged on the water sampling tube of source; Described former alum pond is provided with former alum pit level meter, and described high-order alum pond is provided with high-order alum pit level meter; Described water solenoid valve, former alum pump, stirrer, former alum pit level meter, high-order alum pit level meter, source Water Flowmeters, source water turbidity instrument, automatic regulating valve and the magnetic flow meter of adding all is electrically connected with PLC;

Concrete installation steps comprise:

Step one: get out former alum pond, high-order alum pond;

Step 2: installation integral type is joined alum and thrown alum housing: be pre-installed the sequence of control in PLC, comprises the concentration computation program, the automatically calculating that automatically calculate alum liquid concentration and the program, the fault processing module that control alum dosage; PLC, touch-screen, electrical element, Non-follow control case are installed to the top in cabinet, wherein, touch-screen is installed to cabinet surface, by automatic regulating valve, magnetic flow meter, adding water solenoid valve and former alum pump and be installed to bottom in cabinet, connecting automatic regulating valve and magnetic flow meter with going out alum pipe; Electricity consumption bundle of lines adds water solenoid valve, former alum pump, automatic regulating valve and magnetic flow meter and PLC connects;

Step 3: connect the former alum pump in former alum pond, housing, valve and high-order alum pond with former alum pipe successively, connecting automatic regulating valve in high-order alum pond, housing and magnetic flow meter successively with going out alum pipe, connecting successively with water inlet pipe and adding water solenoid valve and high-order alum pond in housing;

Step 4: stirrer is installed on high-order alum pond; Source Water Flowmeters and source water turbidity instrument are installed on the water sampling tube of source; Former alum pond installs former alum pit level meter, installs high-order alum pit level meter in high-order alum pond;

Step 5: stirrer, former alum pit level meter, high-order alum pit level meter, source Water Flowmeters, source water turbidity instrument are electrically connected with PLC; Stirrer, control circuit between former alum pump and Non-follow control case are connected respectively;

Step 6: going out in alum pipe and former alum pipe to install valve, installs strainer and back washing anti-blocking valve in contiguous going out on alum pipe of high-order alum pond;

Step 7: debug, completes installation.