CN216946527U - Chemical water making system - Google Patents

Abstract

The utility model discloses a chemical water production system, which comprises an ultrafiltration water treatment system, a reverse osmosis water treatment system, a mixed bed water treatment system and a PLC (programmable logic controller) which are sequentially communicated, wherein the PLC is respectively electrically connected with the ultrafiltration water treatment system, the reverse osmosis water treatment system and the mixed bed water treatment system and is used for monitoring and acquiring running state parameters of the ultrafiltration water treatment system, the reverse osmosis water treatment system and the mixed bed water treatment system; ultrafiltration water treatment system is including the raw water tank, fine sand filter, ultrafiltration device, the ultrafiltration water tank that loop through the pipe connection, the input of fine sand filter is equipped with coagulant charge device, ultrafiltration device's input is equipped with germicide charge device, just ultrafiltration device has ultrafiltration belt cleaning device through the pipe connection, the ultrafiltration water tank is equipped with the first liquid level control device who is used for adjusting its liquid level. The chemical water production system disclosed by the utility model realizes the control of each link so as to improve the water production efficiency.

Description

Chemistry water preparation system

Technical Field

The utility model belongs to the technical field of water production, and particularly relates to a chemical water production system.

Background

The process water is consumed in a large amount in a thermal power plant, independent and dispersed control modes are adopted for preparation of existing process water mostly, misoperation occurs in any link, water preparation process interruption can be caused, multiple operators are needed to be used in the control mode, contact among systems is inconvenient, management is difficult, the defects of low water preparation efficiency and easiness in damage of equipment are overcome, the existing equipment needs the operators to monitor whether equipment data are abnormal at regular time, corresponding flow and liquid level are manually adjusted according to the data abnormal condition of the equipment, and labor intensity of workers is increased.

Therefore, how to provide a water production control system to realize the control of each link and further improve the water production efficiency is a technical problem which needs to be solved by technical personnel in the field at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a chemical water making system which realizes the control of each link so as to improve the chemical water making efficiency.

In order to achieve the above object, the present invention provides a chemical water production system, comprising: the ultrafiltration water treatment system is used for pretreating a water source of a power plant and filtering harmful substances such as bacteria, rust, colloid and the like in water; the reverse osmosis water treatment system is used for treating the produced water of the ultrafiltration water treatment system and can remove dissolved solids, colloids, organic matters and bacteria in the water; the mixed bed water treatment system is used for treating the produced water of the reverse osmosis water treatment system and can reduce the hardness, alkalinity and anions and cations in the water; the PLC is respectively electrically connected with the ultrafiltration water treatment system, the reverse osmosis water treatment system and the mixed bed water treatment system and is used for monitoring and collecting the operating state parameters of the ultrafiltration water treatment system, the reverse osmosis water treatment system and the mixed bed water treatment system; the ultrafiltration water treatment system comprises a raw water tank, a fine sand filter, an ultrafiltration device and an ultrafiltration water tank which are sequentially connected through a pipeline, wherein the input end of the fine sand filter is provided with a coagulant dosing device, the input end of the ultrafiltration device is provided with a bactericide dosing device, the ultrafiltration device is respectively connected with an acid and alkali adding system and an ultrafiltration cleaning device through pipelines, and the ultrafiltration water tank is provided with a first liquid level control device for adjusting the liquid level of the ultrafiltration water tank.

Preferably, the coagulant dosing device comprises a coagulant water tank and a coagulant metering pump, the input end of the coagulant metering pump is connected with the coagulant water tank, the input end of the coagulant metering pump is further provided with a flow calibration column, and the output end of the coagulant metering pump is connected with the input end of the fine sand filter.

Preferably, the first liquid level control device comprises a first liquid level switch for acquiring the height information of the internal liquid level of the ultrafiltration water tank, and the first liquid level switch is respectively electrically connected with a raw water pump connected with the output end of the raw water tank and an ultrafiltration water pump connected with the output end of the ultrafiltration water tank through a PLC (programmable logic controller).

Preferably, the reverse osmosis water treatment system comprises a reverse osmosis device assembly, the input end of the reverse osmosis device assembly is connected with the output end of the ultrafiltration water tank through an ultrafiltration water pump, an acid adding device, a scale inhibitor adding device, an SD I automatic determinator, a bactericide adding device, an unqualified water discharge valve, a security filter, a reverse osmosis high-pressure pump and a flushing water pump are sequentially arranged on a pipeline between the input end of the reverse osmosis device assembly and the ultrafiltration water pump, and the output end of the reverse osmosis device assembly is sequentially communicated with a carbon removal fan and a middle water tank through pipelines.

Preferably, the middle water tank is provided with a second liquid level control device, the second liquid level control device is connected with the PLC controller, the second liquid level control device includes a second liquid level switch for acquiring the internal liquid level height information of the middle water tank, and the second liquid level switch is respectively electrically connected with the ultrafiltration water pump connected with the output end of the ultrafiltration water tank and the middle water pump connected with the output end of the middle water tank through the PLC controller.

Preferably, the mixed bed water treatment system comprises a compressed air device, a mixed bed device, an acid adding device for conveying acid for the mixed bed device, an alkali adding device for conveying alkali for the mixed bed device and a desalting water tank which are communicated through pipelines, and the mixed bed device comprises a first mixed bed assembly and a second mixed bed assembly which are sequentially communicated through pipelines.

Preferably, the compressed air device comprises a compressed air pipeline which is connected with the mixed bed device and is used for conveying compressed air, the acid adding device comprises an acid ejector, the acid ejector is connected with the mixed bed device through a pipe, the alkali adding device comprises an alkali ejector, and the alkali ejector is connected with the mixed bed device through a pipe.

Preferably, the input end of the demineralized water tank is connected with the output end of the second mixed bed assembly through a pipeline, and the output end of the demineralized water tank is respectively connected with the demineralized water pump, the flushing water pump, the reclaimed water pump and the self-service water pump through pipelines.

More preferably, the demineralized water tank is provided with a third liquid level control device, and the third liquid level control device is electrically connected with the PLC.

More preferably, when the ultrafiltration water treatment system, the reverse osmosis water treatment system and the mixed bed water treatment system work, the PLC controller needs to start the next system to work normally after the previous system reaches the standard.

By adopting the chemical water making system provided by the utility model, each subsystem can be started and stopped by one key through the PLC controller, and the chemical water making control system can be started and stopped by one key, so that equipment in each link can be controlled, in the working process, the PLC controller can dynamically adjust the liquid levels of the ultrafiltration water tank, the intermediate water tank and the desalting water tank, the condition that the same equipment is started and stopped for multiple times is avoided, the service life of the equipment is prolonged, and the PLC controller interlocks the metering pump of the dosing device to prevent medicament from being retained and deposited, so that the corresponding equipment is polluted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic control diagram of a chemical water production system according to an embodiment of the present invention;

FIG. 2 is a schematic view of a raw water tank apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic view of a coagulant dosing device provided by an embodiment of the present invention;

FIG. 4 is a schematic view of a fine sand filter assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view of an ultrafiltration device according to an embodiment of the present invention;

FIG. 6 is a schematic view of a reverse osmosis water treatment system according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a reverse osmosis germicide addition apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic view of an intermediate tank assembly according to an embodiment of the present invention;

FIG. 9 is a schematic view of a primary mixing bed apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a two-stage mixing bed apparatus according to an embodiment of the present invention;

FIG. 11 is a schematic view of a desalination tank assembly according to an embodiment of the present invention;

wherein: 1. the system comprises an ultrafiltration water treatment system, 11 a raw water tank, 12 a fine sand filter, 13 an ultrafiltration device, 14 an ultrafiltration water tank, 15 a coagulant dosing device, 154 a coagulant water tank, 152 a coagulant metering pump, 153 a flow calibration column, 16 a bactericide dosing device, 17 an acid and alkali adding system, 18 an ultrafiltration cleaning device, 2 a reverse osmosis water treatment system, 21 a reverse osmosis device component, 22 a scale inhibitor adding device, 23 an acid adding device, 24 an SDI automatic determinator, 25 a bactericide adding device, 26 an unqualified water discharge valve, 27 a security filter, 28 a reverse osmosis high-pressure pump, 29 a decarbonizing fan, 290 an intermediate water tank, 3 a mixed bed water treatment system, 31 a compressed air device, 32 a mixed bed device, 321 a first mixed bed component, 322 a second mixed bed component, 33 an acid ejector, 34 an alkali ejector and 35 a brine removal tank.

Detailed Description

The core of the utility model is to provide a chemical water making system which realizes the automatic control of each subsystem, thereby improving the water making efficiency, prolonging the service life of equipment and reducing the labor intensity of operators.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 to 11, an ultrafiltration water treatment system 1 according to the present invention is used for pre-treating a water source of a power plant and filtering harmful substances such as bacteria, rust, and colloid in the water; a reverse osmosis water treatment system 2 for treating the produced water of the ultrafiltration water treatment system 1 and removing dissolved solids, colloids, organic matters and bacteria in the water; the mixed bed water treatment system 3 is used for treating the produced water of the reverse osmosis water treatment system 2 and can reduce the hardness, alkalinity and anions and cations in the water; the PLC is respectively electrically connected with the ultrafiltration water treatment system 1, the reverse osmosis water treatment system 2 and the mixed bed water treatment system 3 and is used for monitoring and acquiring the running state parameters of the ultrafiltration water treatment system 1, the reverse osmosis water treatment system 2 and the mixed bed water treatment system 3; the ultrafiltration water treatment system 1 comprises a raw water tank 11, a fine sand filter 12, an ultrafiltration device 13 and an ultrafiltration water tank 14 which are sequentially connected through a pipeline, a coagulant dosing device 15 is arranged at the input end of the fine sand filter 12, a bactericide dosing device 16 is arranged at the input end of the ultrafiltration device 13, the ultrafiltration device 13 is respectively connected with an acid and alkali adding system 17 and an ultrafiltration cleaning device 18 through pipelines, and the ultrafiltration water tank 14 is provided with a first liquid level control device for adjusting the liquid level of the ultrafiltration water tank.

Specifically, chemistry water preparation system's water source is underground water source and colliery water source, and the output of raw water tank 11 passes through raw water pump and is connected with fine sand filter 12, raw water pump's quantity is 3, and raw water tank 11 is connected with the backwash water pump, backwash water pump's input and raw water tank 11 are connected, backwash water pump's output and fine sand filter 12 are connected, backwash water pump that raw water tank set up is mainly used for preventing that the tiny pore in raw water tank's the filter bed is blocked up, influence the flow of liquid, because the source of system water is different, the water that consequently flows in fine sand filter 12 has two kinds of treatment methods: 1. the underground water source is directly connected with the fine sand filter 12 without entering the raw water tank, but the underground water source needs to be sterilized by adding sodium hypochlorite. 2. The coal mine water source is connected with the fine sand filter 12 through a raw water tank and a raw water pump after being pretreated.

Specifically, the coagulant dosing device 15 comprises a coagulant water tank 151 and two coagulant dosing pumps 152, the input ends of which are connected with the coagulant water tank 151, the number of the coagulant dosing pumps is two, the input end of the coagulant dosing pump 152 is further provided with a flow check column 153, the output end of the coagulant dosing pump 152 is connected with the input end of a fine sand filter, colloidal particles in water can be mutually bonded and gathered together in the water treatment process by arranging the coagulant dosing device 15, so as to treat water quality, accurate addition of coagulant dosage is achieved by arranging the coagulant dosing pump 152, and the coagulant dosing device 15 is connected with a PLC controller, so that the coagulant dosing dosage can be changed by the PLC controller, the flow check column 153 is used for accurately checking the working flow of the coagulant dosing pump 152, the storage tank 154 is provided for collecting the coagulant overflowed from the coagulant tank 151 or the residual coagulant at the bottom of the coagulant tank 151.

Specifically, the number of the fine sand filters 12 is 5, and the fine sand filter applied in the present application is a direct application of the prior art, so the working principle of the fine sand filter 12 will not be described herein.

Specifically, ultrafiltration device 13's quantity is 2, and ultrafiltration device 13's input is equipped with germicide charge device 16, germicide charge device 16 includes germicide solution tank, the solution conveying mechanism who is connected with germicide solution tank output, the quantity of germicide solution tank is two, solution conveying mechanism is 4 groups, ultrafiltration device 13's the output that passes through pipeline and 18 is connected, add acid and add alkali system 17 to ultrafiltration belt cleaning device 18's input connection, add acid and add alkali system 17 and include acid holding vessel and alkali holding vessel, and respectively with the measuring pump that acid holding vessel and alkali holding vessel are connected.

Specifically, the input end of the ultrafiltration water tank 14 is connected with the water production port of the ultrafiltration device 13, and the output end of the ultrafiltration water tank 14 is connected with the input end of the ultrafiltration water pump.

Specifically, the first liquid level control device includes a first liquid level switch for acquiring the internal liquid level height information of the ultrafiltration water tank 14, and the liquid level switch is electrically connected with the raw water pump connected to the output end of the raw water tank 11 and the ultrafiltration water pump connected to the output end of the ultrafiltration water tank 14 through the PLC controller.

Specifically, the control flow of the ultrafiltration water treatment system 1 is as follows:

firstly, it is required to ensure that at least 1 spare raw water pump, at least 2 spare fine sand filters, at least 1 spare ultrafiltration device and at least 1 spare ultrafiltration water tank are provided, and the spare equipment is in a good state, is not in any sequential control, has no fault and is allowed to be started.

And secondly, checking the running condition of each device according to the PLC, and selecting the required device usage number according to the water production amount.

And thirdly, selecting a water source of the chemical water production system, starting the raw water tank and the raw water pump to supply water when the underground water source mode is selected, and waiting for the start of the fine sand filter when the coal mine water source is selected.

Fourthly, starting a coagulant metering pump 152 of the coagulant dosing device 15;

and fifthly, starting the selected fine sand filter 12 for sequential control, and starting the selected ultrafiltration device 13 for sequential control.

Sixthly, after the liquid level of the ultrafiltration water tank 14 of the ultrafiltration water treatment system 1 is 6m, the liquid level information is transmitted to the PLC controller, and the PLC controller controls the ultrafiltration water treatment system to stop working.

In order to ensure good conduction of main media of the ultrafiltration water treatment system 1 and avoid damage to equipment of the ultrafiltration system caused by overlarge medium pressure and flow fluctuation, attention should be paid to the automatic operation process of the subsystem:

1. in order to prevent the medium from flowing empty, the inlet flow rate needs to be more than 20t/h after the selected fine sand filter 12 is exhausted, and the next step can be carried out.

2. In order to avoid the unsmooth waterway and the pressure blockage of the pipeline of the system, the fine sand filter 12 can be put into water production after the selected ultrafiltration device 13 enters a rinsing state.

3. In order to prevent the overpressure of the system when the ultrafiltration device 13 is used for backwashing, when the ultrafiltration water production is switched to backwashing, the front discharge gate of the selected fine sand filter 12 is opened, then ultrafiltration is carried out for backwashing, and after the backwashing is finished and the water production state is put into operation, the front discharge gate of the fine sand filter 12 can be closed; the pressure of the main pipe of the fine sand filter 12 and the pressure of the ultrafiltration inlet are either more than 0.26MPa, and the pressure of the fine sand filter 12 needs to be relieved.

4. Abnormal alarm settings need to be made on the highest liquid level and the lowest liquid level of the ultrafiltration water tank 14, the main pipe pressure and the ultrafiltration inlet pressure of the fine sand filter 12, the inlet flow of the fine sand filter 12 and the states of all devices, and the system is stopped in a limit state.

The PLC controller can start and stop each device of the ultrafiltration water treatment system 1 by one key or independently start and stop each device, when the ultrafiltration water treatment system 1 is started and stopped by one key, each device needs to make water to an ultrafiltration reasonable liquid level so as to start the next device, and because the water making capacity of the device deviates from a design value in the long-period water making process, the ultrafiltration water tank 14 is difficult to reach an absolute water balance, and necessary adjustment is still needed after the liquid level is out of limit.

The liquid level of the ultrafiltration water tank 14 is maintained at 4-5m as the best scheme, when the chemical water production automatic control system is started and stopped by one key, the liquid level of the ultrafiltration water tank 14 of the ultrafiltration water treatment system 1 is greater than 4.5m, so that the subsequent reverse osmosis water treatment system can be started or the ultrafiltration water treatment system can be stopped, when the liquid level of the ultrafiltration water tank 14 exceeds the limit, the ultrafiltration backwashing time, the raw water pump frequency conversion and the reverse osmosis high-pressure pump frequency conversion need to be adjusted, the highest liquid level of the ultrafiltration water tank is 5m, and the specific adjustment steps are as follows:

1. adjusting the ultrafiltration backwashing time: when the ultrafiltration device is used for backwashing, the water inflow of the ultrafiltration water tank is greatly reduced, and the water quantity of the water tank is consumed as a main disturbance quantity; linearly biasing the derived water level of the water tank, and intervening the water production time of ultrafiltration filtration to achieve the relative dynamic balance of the water level of the water tank; when the liquid level is further out of limit, the water production output of the front subsystem and the rear subsystem of the water tank needs to be interfered.

2. Adjusting a raw water pump frequency conversion instruction: when the liquid level of the ultrafiltration water tank is less than 3m, the raw water pump frequency conversion instruction is superposed with a linearization positive offset derived from the water tank liquid level, the maximum is 5Hz, so as to increase the water production amount of the ultrafiltration water treatment system, and when the liquid level of the ultrafiltration water tank 14 is more than 5m, the water production amount is reduced.

3. Frequency conversion adjustment of the reverse osmosis high-pressure pump: when the liquid level of the ultrafiltration water tank 14 is less than 3m, the reverse osmosis high-pressure pump frequency conversion instruction is superposed with the maximum-4 Hz offset.

It should be noted that after the frequency conversion setting is biased, the limitation of the frequency conversion commands in different modes is considered, so that the condition that the service life of a frequency converter is damaged or the overpressure of a pipeline and a membrane element is caused after the commands are set by an operator and superposed with the offset command is prevented. When the liquid level of the ultrafiltration water tank 14 is out of limit, an operator needs to be warned by a light character board, and if the liquid level reaches a protection low value and a protection high overflow value, the ultrafiltration water treatment system and the chemical water production automatic control system are stopped.

Specifically, the reverse osmosis water treatment system 2 comprises a reverse osmosis device assembly 21, the input end of the reverse osmosis device assembly 21 is connected with the output end of an ultrafiltration water tank 14 through an ultrafiltration water pump, a pipeline between the input end of the reverse osmosis device assembly 21 and the ultrafiltration water pump is sequentially provided with an acid adding device 22, a scale inhibitor adding device 23, an SDI automatic determinator 24, a bactericide adding device 25, an unqualified water discharge valve 26, a security filter 27, a reverse osmosis high-pressure pump 28 and a flushing water pump, and the output end of the reverse osmosis device assembly is sequentially communicated with a decarbonization fan 29 and an intermediate water tank 30 through pipelines.

Specifically, the number of the ultrafiltration water pumps is 3, the reverse osmosis devices are two groups, the middle water tank 30 is 2 groups, and the bactericide adding device 25, the scale inhibitor adding device 26, the cartridge filter 27 and the reverse osmosis high-pressure pump 28 are respectively two groups.

Specifically, the reverse osmosis bactericide adding device comprises a bactericide medicine box and a bactericide metering pump connected with the output end of the bactericide medicine box.

Specifically, an acid adding device 22, a scale inhibitor adding device 23, an SDI automatic determinator 24, a bactericide adding device 25, an unqualified water discharge valve 26, a cartridge filter 27, a reverse osmosis high-pressure pump 28, a flushing water pump, a carbon removal fan 29 and an intermediate water tank 30 are all electrically connected with a PLC controller.

Specifically, the carbon removal fan removes water free carbon dioxide by means of air blowing and degassing, water is introduced from the upper part of the equipment, flows through the surface of the packing layer through a spraying device, and air enters from a lower air port and reversely passes through the packing layer. The free carbon dioxide in the water is quickly resolved into the air and discharged from the top, and the residual carbon dioxide in the water is not more than 5 mg/L after being degassed by a carbon removal fan.

Specifically, the SDI automatic determinator 24 is used for determination of SDI (contamination index) values in reverse osmosis water treatment systems.

Specifically, because the ultrafiltration water pump and the reverse osmosis high-pressure pump 28 are closely corresponding and the number of the ultrafiltration water pumps is three, the reverse osmosis high-pressure pump 28 and the reverse osmosis device assembly 21 are two, and the reverse osmosis device is set to correspond to the preselection mode of the ultrafiltration water pump one by one, the specific corresponding mode is as follows:

b1 reverse osmosis-B1 ultrafiltration water pump B2 reverse osmosis-B1 ultrafiltration water pump

B1 reverse osmosis-B2 ultrafiltration water pump B2 reverse osmosis-B2 ultrafiltration water pump

B1 reverse osmosis-B3 ultrafiltration water pump B3 reverse osmosis-B3 ultrafiltration water pump

Specifically, the control flow of the ultrafiltration water treatment system 1 is as follows:

firstly, it is required to ensure that at least 1 spare ultrafiltration water pump, at least 1 spare reverse osmosis device, a scale inhibitor metering pump of the scale inhibitor adding device 26 and a bactericide metering pump of the bactericide adding device 25 are both spare, wherein the spare equipment has a good state, is not in any sequential control, has no fault and is allowed to be started.

When the reverse osmosis water treatment system is started through the PLC, when the PLC acquires that the liquid level of the middle water tank 30 is lower than 1.2 meters, equipment of the reverse osmosis water treatment system is started in a sequential control mode.

Thirdly, opening the unqualified water discharge valve 26 to reach 20 percent, automatically putting into service, and setting the pressure of a main pipe at the inlet of the cartridge filter 27 to be 0.28 MPa;

fourthly, starting the selected ultrafiltration water pump, starting the metering pump of the selected scale inhibitor adding device 26 and starting the metering pump of the selected bactericide device 25;

fifthly, when the SDI measured by the SDI automatic measuring instrument 24 is qualified, exhausting and discharging pollution to the security filter 27;

sixthly, flushing the reverse osmosis membrane of the reverse osmosis device at low pressure for not less than 10 min;

starting the reverse osmosis high-pressure pump 28, wherein the rising rate of the reverse osmosis high-pressure pump 28 is 0.6Hz/s from zero to 26Hz, and when the frequency rises to 28Hz, completely closing the unqualified water discharge valve 26 and the reverse osmosis concentrated water discharge door; when the frequency of the reverse osmosis high-pressure pump 28 reaches 32Hz and the produced water conductivity is less than 100, the reverse osmosis concentrated water discharge door and the unqualified discharge door are closed, and the water is produced normally.

Eighthly, after the liquid level of the reverse osmosis water treatment system reaches 2m, the PLC acquires information to control the reverse osmosis water treatment system 2 to be in a sequential control shutdown state.

For preventing that reverse osmosis water treatment system from opening and stopping the emergence of in-process air hammer and water hammer, equipment operation front gas will be arranged to the greatest extent, and system medium pressure will slowly conduct, avoids medium pressure fluctuation too big, and the antithetical couplet jumps the high-pressure pump and damages reverse osmosis unit's membrane element even, and what need notice among the reverse osmosis system start-up process is:

1. in order to realize unmanned intervention, the reverse osmosis water treatment system is electrically connected with the PLC.

2. In order to avoid overlarge medium pressure fluctuation, the unqualified water discharge valve 26 takes the pressure of a main pipe at the inlet of the security filter 27 and the frequency conversion of a reverse osmosis high-pressure pump as main regulation, and takes PID single-loop closed loop as auxiliary regulation, wherein the ratio of the pressure to the frequency conversion of the reverse osmosis high-pressure pump is about 2: 1; the ramp rate of the high pressure pump variable frequency command is limited to match the regulation speed of the reject water discharge valve 26.

3. When the reverse osmosis device is in operation, the reverse osmosis device assembly 21 is ensured not to work simultaneously, and the first set of reverse osmosis device is prevented from being withdrawn from operation due to low pressure when the second set of reverse osmosis device is started.

4. And abnormal alarm setting is carried out on the lower limit liquid level and the upper limit liquid level of the intermediate water tank 30, the pressure of a main pipe at the inlet of the security filter 27, the flow generated by the reverse osmosis high-pressure pump and the states of all devices, and the reverse osmosis water treatment system is stopped when the liquid level of the intermediate water tank reaches the highest limit state.

Specifically, the intermediate water tank 30 is provided with a second level control device, which is connected to the PLC controller, and the second level control device includes a second level switch for acquiring the internal level height information of the intermediate water tank 30, and the second level switch is electrically connected to the ultrafiltration water pump connected to the output end of the ultrafiltration water tank 14 through the PLC controller and is electrically connected to the intermediate water pump connected to the output end of the intermediate water tank 30.

Specifically, the liquid level of the middle water tank 30 is maintained at 1.2m as the best scheme, when the chemical water production automatic control system is started and stopped, the liquid level of the middle water tank of the reverse osmosis water treatment system 1 is larger than 1.2m, so that the subsequent mixed bed water treatment system can be started, and the liquid level of the middle water tank 30 needs to be adjusted in real time due to the small capacity of the middle water tank, so that the middle water tank 30 actually measures the liquid level value through the second liquid level switch to set the set liquid level value of the corresponding middle water tank, and the outlet regulating valve of the middle water pump is subjected to single-loop closed-loop adjustment. Attention is needed to avoid the problem that the shutdown of the subsystem is caused by untimely liquid level adjustment:

1. when the liquid level of the middle water tank is more than 1.4m, the liquid level over-limit part is subjected to derivative linearization bias to be used as the PID feedforward of the adjusting valve, and the valve position accounts for +/-5 percent, so that the liquid level of the water tank is rapidly balanced.

2. When the middle water tank is larger than 1.9m, the reverse osmosis high-pressure pump frequency conversion instruction is superposed with the offset of-4 Hz, and the water inflow of the water tank is reduced.

Specifically, the mixed-bed water treatment system 3 comprises a compressed air device 31, a mixed-bed device 32, an acid adding device for delivering acid to the mixed-bed device, an alkali adding device for delivering alkali to the mixed-bed device and a desalting water tank 35 which are communicated through pipelines, wherein the mixed-bed device comprises a first mixed-bed assembly 321 and a second mixed-bed assembly 322 which are sequentially communicated through pipelines.

Specifically, the compressed air device 31 comprises a compressed air pipeline which is connected with the mixed bed device 32 and is used for conveying compressed air, the acid adding device comprises an acid ejector 33, the acid ejector 33 is connected with the mixed bed device 32 through a pipe, the alkali adding device comprises an alkali ejector 34, and the alkali ejector 34 is connected with the mixed bed device 32 through a pipe.

Specifically, the input end of the demineralized water tank 35 is connected with the output end of the second mixed bed assembly 322 through a pipeline, and the output end of the demineralized water tank 35 is connected with the demineralized water pump, the flushing water pump, the regeneration water pump and the self-service water pump through pipelines respectively.

Specifically, the demineralized water tank 35 is provided with a third level control device electrically connected to the PLC controller.

More specifically, the number of the intermediate water pumps connected to the output end of the intermediate water tank 30 is three, four sets of the first-stage mixed bed assemblies 321, two sets of the second-stage mixed bed assemblies 322, and two sets of the desalted water tanks 35.

More specifically, the amount of water stored in the demineralized water tank 35 is 3000 tons, and the daily water of the chemical water making automatic control system is 50 to 60 tons, so that the water making period is longer, and the operation amount of workers is reduced.

Specifically, the control flow of the mixed-bed water treatment system 3 is as follows:

firstly, at least 1 set of spare desalted water tanks needs to be ensured, the spare equipment has good state, is not in any sequential control, has no fault and is allowed to be started, more than 1 set of spare intermediate water pumps are selected, and no less than 1 set of spare primary/secondary mixed bed components are selected.

Secondly, after 3 drops into of bed water treatment system that mix, the liquid level of demineralized water tank is less than 8 meters, and after the PLC controller acquireed the information, the PLC controller will mix the in-order control start-up of bed water treatment system:

thirdly, starting the selected middle water pump, opening a pneumatic adjusting valve at the inlet of the first-stage mixed bed component 321 to 15 percent, and automatically starting;

fourthly, starting the selected first-stage mixed bed component, and starting the selected second-stage mixed bed component after the forward washing is finished, the flow is more than 30t/h, and the conductivity is less than 0.5 uS/cm;

fifthly, when the second-stage mixed bed positive washing is finished, the flow is more than 30t/h, the conductivity is less than 0.15uS/cm, and the desalting water tank 35 enters a water production state.

And sixthly, when the liquid level of the desalting water tank reaches 11m, the PLC acquires information to control the mixed bed water treatment system to be in the same control and stop running.

In order to prevent the overpressure of the system when the first-stage mixed bed and the second-stage mixed bed are connected, prevent the water pressure of the desalting water tank 35 from flowing back to the second-stage mixed bed when the mixed bed water treatment system 3 is stopped and consider the ordered conduction of the medium pressure, abnormal alarm setting is carried out on the highest liquid level and the lowest liquid level of the desalting water tank, the pressure, the flow of the mixed bed device and the equipment state, and the mixed bed water treatment system is stopped in a limit state.

Particularly, a coagulant, a bactericide and a scale inhibitor are added into an automatic control system for chemical water production, so that mass propagation and metabolism of microorganisms can be prevented, and colloids and particles can be removed, but the medicament is excessive, and the smooth operation of equipment is threatened. For example, the phosphate of the scale inhibitor creates a material condition for microorganism breeding while inhibiting scale, excessive scale inhibitor and coagulant aid can deposit on the surface of a membrane element to form colloid pollution, so that the membrane flux is rapidly reduced, and the turbidity and SD I of the system water quality are ensured to be qualified in real time, the water yield is stable, and the water quality is good for preventing biological pollution blockage, colloid pollution blockage, particle pollution blockage and chemical scaling of equipment, so that the PLC is respectively and electrically connected with the coagulant adding device 15, the bactericide adding device 25 and the scale inhibitor adding device 23.

Specifically, because reverse osmosis equipment is sensitive to microbial fouling, the breeding of microbes in a conveying pipeline, a fine sand filter 12 and a raw water tank 11 in front of a reverse osmosis water treatment system needs to be considered, a set of bactericide adding device can be additionally arranged to be placed at the input end of the raw water tank 11 or the fine sand filter 12, the microbes are removed before entering the reverse osmosis water treatment system, the microbes are prevented from taking a film of the reverse osmosis device as a carrier and breeding by means of nutritive salt of a reverse osmosis concentrated water section, a biofilm layer is formed on the surface of a reverse osmosis membrane, the water inlet plugging pressure of the reverse osmosis water treatment system is caused to rapidly increase the water yield and rapidly reduce the desalination rate, and the water yield is polluted.

Specifically, the coagulant metering pump 152, the bactericide metering pump and the scale inhibitor metering pump are respectively connected with the PLC controller, so that the coagulant metering pump 152, the bactericide metering pump and the scale inhibitor metering pump are interlocked and integrated into the automatic chemical water production control system, the next operation step is interlocked or the corresponding system is protected to be stopped in the state of the coagulant metering pump 152, the bactericide metering pump and the scale inhibitor metering pump, and the PLC controller timely stops the work of the coagulant metering pump 152, the bactericide metering pump and the scale inhibitor metering pump when the automatic chemical water production control system stops water production, so that the chemicals are prevented from being retained and deposited, and the corresponding equipment is prevented from being polluted.

Specifically, the equipment of the automatic chemical water production control system is designed for multi-set volume water production, a dynamic simulation test is carried out on the corresponding relation between the water production and the dosing amount to obtain a dosing pump frequency conversion instruction, and after the water production of the equipment is changed, the dosing pump frequency conversion is automatically adjusted.

Specifically, a chemical water making system is total, with ultrafiltration water processing system 1, reverse osmosis water processing system 2, 3 systems of mixed bed water processing system link up in order, realize chemical water making automatic control system's a key opens and stops the function, will mix ultrafiltration water tank 14 in ultrafiltration water processing system 1, middle water tank 30 in reverse osmosis water processing system 2, demineralized water tank 35 control in mixed bed water processing system 3 is at dynamic balance, avoid equipment frequently to open and stop in whole system water cycle, reach a key system water back water balance.

Specifically, the three subsystems of the ultrafiltration water treatment system 1, the reverse osmosis water treatment system 2 and the mixed bed water treatment system 3 are also provided with a key start-stop function, when the three subsystems of the ultrafiltration water treatment system 1, the reverse osmosis water treatment system 2 and the mixed bed water treatment system 3 are started and stopped and all started, the key start-stop function of the chemical water production automatic control system defaults to be automatically started or started and stopped and started by a key after the three subsystems reach the standard, and the PLC controls the chemical water production automatic control system to be started and stopped by a key.

More specifically, when the three subsystems of the automatic chemical water production control system are started and stopped by one key, the liquid level of the demineralized water tank 35 is transmitted to the PLC controller, and the PLC controller controls the sequential control of the one-key start and stop of the automatic chemical water production control system. The water flow direction is taken as the standard, the water treatment system 1, the reverse osmosis water treatment system 2 and the mixed bed water treatment system 3 are sequentially thrown into the water treatment system in a forward direction during starting, and the water treatment system is stopped in a reverse direction during stopping.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A chemical water production system, comprising:

the ultrafiltration water treatment system (1) is used for pretreating a water source of a power plant and filtering out harmful substances such as bacteria, rust and colloid in water;

the reverse osmosis water treatment system (2) is used for treating the produced water of the ultrafiltration water treatment system (1) and removing dissolved solids, colloids, organic matters and bacteria in the water;

the mixed bed water treatment system (3) is used for treating the produced water of the reverse osmosis water treatment system (2) and reducing the hardness, alkalinity and anions and cations in the water;

the PLC is respectively electrically connected with the ultrafiltration water treatment system (1), the reverse osmosis water treatment system (2) and the mixed bed water treatment system (3) and is used for monitoring and collecting the operating state parameters of the ultrafiltration water treatment system (1), the reverse osmosis water treatment system (2) and the mixed bed water treatment system (3);

ultrafiltration water processing system (1) is including looping through pipe connection's raw water tank (11), fine sand filter (12), ultrafiltration device (13), ultrafiltration water tank (14), the input of fine sand filter (12) is equipped with coagulant charge device (15), the input of ultrafiltration device (13) is equipped with germicide charge device (16), just ultrafiltration device (13) have ultrafiltration belt cleaning device (18) through the pipe connection, ultrafiltration water tank (14) are equipped with the first liquid level control device who is used for adjusting its liquid level.

2. A chemical water making system according to claim 1, wherein said coagulant dosing device (15) comprises a coagulant water tank (151) and a coagulant metering pump (152) having an input end connected to said coagulant water tank (151), said coagulant metering pump (152) further having a flow check column (153) at its input end, said coagulant metering pump (152) having an output end connected to said input end of said fine sand filter.

3. A chemical water production system according to claim 1, wherein the first liquid level control device comprises a first liquid level switch for obtaining the internal liquid level information of the ultrafiltration water tank (14), and the first liquid level switch is electrically connected with the raw water pump connected with the output end of the raw water tank (11) and the ultrafiltration water pump connected with the output end of the ultrafiltration water tank (14) through a PLC controller.

4. A chemical water production system according to claim 1, wherein the reverse osmosis water treatment system (2) comprises a reverse osmosis device assembly (21), wherein an input end of the reverse osmosis device assembly (21) is connected with an output end of the ultrafiltration water tank (14) through an ultrafiltration water pump, a pipeline between the input end of the reverse osmosis device assembly (21) and the ultrafiltration water pump is sequentially provided with an acid adding device (22), a scale inhibitor adding device (23), an SDI automatic determinator (24), a bactericide adding device (25), a defective water discharge valve (26), a security filter (27), a reverse osmosis high-pressure pump (28) and a flushing water pump, and an output end of the reverse osmosis device assembly is sequentially communicated with a decarbonization fan (29) and an intermediate water tank (30) through a pipeline.

5. A chemical water production system according to claim 4, wherein the intermediate tank (30) is provided with a second level control means, the second level control means being connected to the PLC controller, the second level control means comprising a second level switch for obtaining information on the internal level of the intermediate tank (30), the second level switch being electrically connected to the ultrafiltration pump electrically connected to the output of the ultrafiltration tank (14) and to the intermediate pump electrically connected to the output of the intermediate tank (30) via the PLC controller, respectively.

6. A chemical water production system according to claim 1, wherein the mixed bed water treatment system (3) comprises a compressed air device (31), a mixed bed device (32), an acid adding device for delivering acid to the mixed bed device, an alkali adding device for delivering alkali to the mixed bed device and a demineralized water tank (35) which are connected by a pipeline, and the mixed bed device comprises a first mixed bed component (321) and a second mixed bed component (322) which are connected in sequence by a pipeline.

7. A chemical water production system according to claim 6, wherein the compressed air device (31) comprises a compressed air conduit connected to the mixed bed device (32) for conveying compressed air, the acid adding device comprises an acid injector (33), the acid injector (33) is in pipe connection with the mixed bed device (32), the alkali adding device comprises an alkali injector (34), and the alkali injector (34) is in pipe connection with the mixed bed device (32).

8. A chemical water production system according to claim 6, wherein the input end of the demineralized water tank (35) is connected with the output end of the second mixed bed assembly (322) through a pipeline, and the output end of the demineralized water tank (35) is respectively connected with the demineralized water pump, the flushing water pump, the regenerating water pump and the self-service water pump through pipelines.

9. A chemical water production system according to claim 6, wherein the demineralized water tank (35) is provided with a third level control means, said third level control means being electrically connected to said PLC controller.

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