CN114368818A - Preparation system and preparation method of circulating cooling water make-up water of power plant - Google Patents

Abstract

The invention discloses a preparation system of circulating cooling water make-up water of a power plant, relates to the technical field of cooling water preparation, and solves the problems of complex process, sewage generation, high operation and maintenance difficulty, low automation degree, high investment cost and the like of the conventional water purification treatment process. The system comprises a river water lifting system and a dosing mechanical mixing system, wherein a water outlet of a rotary mixer is communicated with a clarification tank, clear water separated from the clarification tank is introduced into a valveless filter, filtered water of the valveless filter is communicated to a water production tank through the water outlet, the water production tank is conveyed to each water using point through a water supply pump, and the clarification tank and the valveless filter are communicated to a middle water tank through a sewage discharge outlet; the intermediate water tank is communicated with a sludge concentration tank, the sludge concentration tank is communicated with a sludge dewatering device through a sludge pump, and filtrate of the sludge dewatering device is returned to the intermediate water tank; the supernatant of the sludge concentration tank is communicated to a reclaimed water tank, and the reclaimed water tank is communicated to the rotary mixer through a reclaimed water pump. The effects of simple process, low operation cost and no sewage discharge and sewage discharge cost are achieved.

Description

Preparation system and preparation method of circulating cooling water make-up water of power plant

Technical Field

The invention relates to the technical field of cooling water preparation, in particular to a circulating cooling water make-up water preparation system of a power plant and a preparation method thereof.

Background

With the continuous acceleration of the industrialization process, the production type enterprises have increasing demands for the production water, the cost of the production water and the water supply capacity of the supply end are considered, and it is important to ensure the water pressure and the water quantity stability of the production water in the production process of the enterprises. The invention mainly aims to meet the requirements of production water or raw production water after purifying low-pollution river water, so that the river water is recycled, and the dependence of enterprises on municipal tap water is reduced.

The existing river water purification treatment process has the basic conditions of complex process, sewage generation, high operation and maintenance difficulty, low automation degree and high investment cost, so that an economical and practical automatic treatment process which is simple in process, low in operation cost, low in manual labor intensity, low in overhaul difficulty and free of sewage generation and sewage cost is urgently needed.

Disclosure of Invention

The invention aims to provide a preparation system of circulating cooling water make-up water of a power plant, which aims to solve the requirements of stable and low energy consumption of the existing part of production enterprises on the production water, does not generate sewage and sewage discharge cost, and is economical and practical.

The technical purpose of the invention is realized by the following technical scheme:

a preparation system of circulating cooling water make-up water of a power plant comprises a rotary mixer, the rotary mixer is communicated with a river water lift pump for pumping river water into the rotary mixer and a chemical adding mechanical mixing system for adding medicaments, a water outlet of the rotary mixer is communicated with a clarification tank,

clear water separated from the clarification tank is introduced into the valveless filter, filtered water of the valveless filter is communicated to a water production tank through a water outlet, the water production tank is conveyed to each water using point through a water supply pump, and the valveless filter is communicated to a middle water tank through a sewage discharge outlet;

the intermediate water tank is communicated with a sludge concentration tank, the sludge concentration tank is communicated with a sludge dewatering device through a sludge pump, and filtrate of the sludge dewatering device is returned to the intermediate water tank; the supernatant of the sludge concentration tank is communicated to a reclaimed water tank, and the reclaimed water tank is communicated to the rotary mixer through a reclaimed water pump.

Furthermore, the mechanical drug adding mixing system comprises a PAC adding pump for adding PAC and a PAM adding pump for adding PAM.

Furthermore, the inlet of the river water lift pump is communicated with a river channel water intake, and a river water turbidimeter is further arranged at the river channel water intake.

Furthermore, the mud discharging side of the clarification tank is communicated to the middle water tank through a plurality of electric mud discharging valves.

Furthermore, a forced backwashing electric valve is arranged on the valveless filter, the valveless filter monitors backwashing frequency through a backwashing tuning fork material level, backwashing is carried out through the forced backwashing electric valve after the frequency is lower than a set value, and backwashing water is discharged through a sewage discharge outlet.

Furthermore, the bottom of the valveless filter is sequentially provided with a bearing plate, a stainless steel water filtering cap, natural pebbles and natural quartz sand from bottom to top, wherein the natural pebbles are provided with three layers according to a grading scheme, and the natural quartz sand is provided with two layers according to a grading scheme.

Still further, the water application point includes a medicated mechanical mixing system.

Furthermore, the depth of the sludge inlet pipe of the sludge concentration tank inserted into the tank is half of the total depth, and the sludge discharge pipe adopts a branch-shaped perforated pipe.

The invention also aims to provide a preparation system of the circulating cooling water make-up water of the power plant, which does not generate sewage and sewage discharge cost and is economical and practical.

The technical purpose of the invention is realized by the following technical scheme:

a preparation method of circulating cooling water make-up water of a power plant comprises the following steps,

s1: opening a river water lift pump, pumping the river water to a rotary mixer, adding PAC (polyaluminium chloride), adding PAM (polyacrylamide) after PAC neutralizes charges and colloid is destabilized to form fine flocs, and further increasing the volume of the flocs;

s2: s1, flocculating the coagulated water in a clarification tank and removing colloids in the water, filtering the separated clear water in a valveless filter, allowing the filtered water in the valveless filter to flow to a water production tank through a water outlet, and automatically backwashing the water to flow to a middle water tank;

s3: pumping water in the intermediate water tank to a sludge concentration tank through a lifting pump, treating sludge water in the sludge concentration tank through a sludge dewatering device, transporting a sludge cake outwards, and returning filtrate to the intermediate water tank;

s4: and the supernatant of the sludge concentration tank enters the middle water tank and is lifted to the rotary mixer again.

Furthermore, in step S2, the clarification tank is a hydraulic circulation clarification tank, the coagulated river enters from the bottom of the hydraulic circulation clarification tank, is sprayed into the throat through the nozzle, forms vacuum suction active suspended sludge near the bell mouth at the lower part of the throat, and the raw water and the return sludge are rapidly mixed in the throat and enter the first reaction chamber and the second reaction chamber;

finishing flocculation process in the first reaction chamber and the second reaction chamber, wherein destabilizing impurities are retained by active sludge through contact flocculation, a sludge-water mixture in the second reaction chamber passes through a sedimentation area, and clear water rises in a clear water area after sludge-water separation and is collected by a water collecting tank to enter the gravity type valveless filter;

and one part of the separated active sludge enters the first reaction chamber through backflow, the other part of the residual sludge judges the sludge height and the sludge concentration through the first ultrasonic sludge level meter and the sludge concentration meter, and sludge is discharged through a plurality of electric sludge discharge valves.

In conclusion, the invention has the following beneficial effects:

the circulating cooling water make-up water preparation system integrates an independent mature process unit and novel equipment, has stable and reliable performance and stronger shock resistance, does not influence the continuous operation of the whole system when the independent system is in sludge discharge, back flushing and overload operation, has high automation degree, convenient operation, low equipment manufacturing difficulty and low project construction cost, does not need an external water source in the production process, only has qualified produced water and dewatered sludge as a system product, and has obvious energy-saving and emission-reducing effects;

each process treatment unit is optimized, the water production effect is more stable, the automatic operation of the whole process is realized through the logic programs of equipment, an electric valve and an instrument while the water consumption requirement is met, and the labor intensity and the use of medicaments are greatly reduced;

and the dosage is adjusted according to the fluctuation of the water quality of the incoming water by a river turbidimeter, so that the waste of the medicament caused by excessive dosage in the operation process is avoided, and the operation cost is reduced.

Drawings

FIG. 1 is a schematic diagram of the overall plant architecture (PID diagram) of the present invention;

FIG. 2 is a schematic view of the overall process flow of the present invention.

In the figure, 1, a river water lifting system; 1.1, a river water lift pump; 1.2, a rotary mixer; 1.3, a flow meter; 1.4, taking a water inlet of a river channel; 1.5, a first water outlet; 1.6, a water supply valve; 1.7, a river turbidity meter;

2. a dosing mechanical mixing system; 2.1, automatically dissolving a medicine box by PAM; 2.2, a PAM feeding pump; 2.3, PAM feed valve; 2.4, automatically dissolving a medicine box by PAC; 2.5, PAC dosing pump; 2.6, PAC feed valve; 2.7, a PAM feed inlet; 2.8, PAC feed inlet;

3. a hydraulic circulating clarification tank; 3.1, a first ultrasonic mud level meter; 3.2, a first electric mud valve; 3.3, a second electric mud valve; 3.4, a second water outlet; 3.5, a first sludge discharge port; 3.6, a second sludge discharge port; 3.7, a sludge concentration meter;

4. a valveless filter; 4.1, forcibly backwashing the electric valve; 4.2, backwashing the tuning fork material level; 4.3, a water inlet turbidimeter; 4.4, a produced water turbidimeter; 4.5, a third water outlet; 4.6, a sewage draining outlet;

5. a water production constant-pressure water supply system; 5.1, a water production tank; 5.2, a produced water liquid level meter; 5.3, a constant pressure water supply pump; 5.4, a fourth water outlet;

6. a sludge dewatering system; 6.1, an intermediate water pool; 6.2, a sludge lift pump; 6.3, a sludge concentration tank; 6.4, a first ultrasonic liquid level meter; 6.5, a second ultrasonic liquid level meter; 6.6, a sludge pump; 6.7, PAM pump; 6.8, spinning a dehydrator; 6.9, a fifth water outlet; 6.10, a sixth water outlet; 6.11, a seventh water outlet; 6.12, a sludge outlet valve; 6.13, PAM supply valve; 6.14, a second ultrasonic mud level meter;

7. a reclaimed water lifting system; 7.1, a reclaimed water tank; 7.2, a reclaimed water pump; 7.3 and an eighth water outlet.

Detailed Description

The following further describes the embodiments of the present invention with reference to the drawings, and the present embodiment is not to be construed as limiting the invention.

A preparation system of circulating cooling water make-up water of a power plant is shown in figure 1 and comprises a river water lifting system 1, wherein the river water lifting system 1 comprises a rotary mixer 1.2, the rotary mixer 1.2 is provided with a low-speed stirring paddle blade for feeding in and discharging out from the lower part, the coagulating sedimentation time is prolonged, a PAM (polyacrylamide) feeding port is separately arranged in the middle and is separated from a PAC (polyaluminium chloride) feeding point, and the use of a medicament is saved so as to achieve a better coagulating effect;

the rotary mixer 1.2 is communicated with a river water lift pump 1.1 for pumping river water into the rotary mixer and a drug adding mechanical mixing system 2 for adding drugs through a communicating pipeline,

an inlet of the river water lift pump 1.1 is communicated with a river channel water intake 1.4, and a communicating pipeline at the position of the river channel water intake 1.4 is also provided with a water supply valve 1.6 and a river water turbidimeter 1.7 so as to control water inflow and adjust the adding amount of the chemical adding mechanical mixing system 2 according to the river water turbidity.

As shown in fig. 1, the dosing mechanical mixing system 2 comprises a PAM automatic dissolving tank 2.1 and a PAC automatic dissolving tank 2.4, the PAM automatic dissolving tank 2.1 is communicated with a communication pipeline through a PAM feeding port 2.7, a PAM feeding pump 2.2 for driving and a PAM feeding valve 2.3 for opening and closing are installed at the PAM feeding port 2.7, the PAC automatic dissolving tank 2.4 is communicated with the communication pipeline through a PAC feeding port 2.8, a PAC feeding pump 2.5 for driving and a PAC feeding valve 2.6 for opening and closing are installed at the PAC feeding port 2.8, wherein the PAM feeding pump 2.2 and the PAC feeding pump 2.5 adopt frequency conversion;

PAM automatic dissolve medical kit 2.1, PAC automatic dissolve medical kit 2.4 and are full-automatic equipment, three boxcars, and the feeding screw rod adopts the frequency conversion, according to intake flowmeter 1.3 and the concentration automatic speed governing that dispenses. The powder storage hopper is provided with a heat preservation measure to prevent the powder from losing efficacy due to water absorption. Each box body is provided with an independent stirrer, the third box body is provided with a floating ball liquid level meter, and when the liquid medicine is at a low position, water is automatically fed; wherein the PAM curing time is not less than 45 min.

As shown in fig. 1 and fig. 2, the PAM and PAC dissolved water sources are both taken from a constant pressure water supply system; PAM is prepared with concentration of 2-2.5 per mill, and anion polyacrylamide is adopted for preparation; PAC preparation concentration is 8% -12%, and 30% solid polyaluminium chloride (spray type) is adopted for preparation.

As shown in fig. 1, a first water outlet 1.5 is arranged on the outlet side of a rotary mixer 1.2, a flowmeter 1.3 is arranged at the position of the first water outlet 1.5, the outer end of the first water outlet 1.5 is communicated with a hydraulic circulation clarification tank 3, two opposite direction sludge discharge systems are arranged on the sludge discharge side (bottom side) of the hydraulic circulation clarification tank 3, the two opposite direction sludge discharge systems comprise a first sludge discharge port 3.5 and a second sludge discharge port 3.6 which are communicated with the bottom of the hydraulic circulation clarification tank, a first electric sludge discharge valve 3.2 and a second electric sludge discharge valve 3.3 are respectively arranged on the first sludge discharge port 3.5 and the second sludge discharge port 3.6, and the outer ends of the first sludge discharge port 3.5 and the second sludge discharge port 3.6 are communicated to a middle water tank 6.1.

In order to facilitate the realization of automatic sludge discharge, a first ultrasonic sludge level meter 3.1 is also arranged at the top of the hydraulic circulating clarification tank 3, and a sludge concentration meter 3.7 is also arranged in the hydraulic circulating clarification tank to judge the sludge height and the sludge concentration so as to facilitate the immediate sludge discharge; the hydraulic circulation clarifying tank 3 carries out air-blast to the sediment sand mud through the perforation aeration pipe when the operation of mud discharging is carried out, prevents that river sand from appearing hardening and can't arrange mud smoothly.

The hydraulic circulation clarification tank 3 is made of steel plates and is of a full-above-ground type, a rotary ladder stand is arranged on the side wall, an overhaul channel is arranged at the top, and the diameter of an overhaul manhole is not less than DN 600; the upper part of the hydraulic circulation clarification tank 3 is connected with a second water outlet 3.4, a water inlet turbidimeter 4.3 is arranged on the second water outlet 3.4, and clean water separated from the hydraulic circulation clarification tank 3 is introduced into the gravity type valveless filter 4;

as shown in fig. 1, the upper part of the gravity type valveless filter 4 is connected with a third water outlet 4.5, filtered water is communicated to a produced water constant pressure lifting system through the third water outlet 4.5, a produced water turbidimeter 4.4 is also arranged at the third water outlet 4.5, the bottom of the valveless filter 4 is connected with a sewage discharge port 4.6, and the outer end of the sewage discharge port 4.6 is communicated to a middle water pool 6.1;

as shown in figure 1, the water production constant-pressure lifting system comprises a water production tank 5.1 communicated with a third water outlet 4.5, a water production liquid level meter 5.2 is installed in the water production tank 5.1, the bottom end of the water production tank 5.1 is connected with a fourth water outlet 5.4, a constant-pressure water supply pump 5.3 is installed at the fourth water outlet 5.4 and is conveyed to water consumption points of various factories through a water supply pump, and the water consumption points comprise water inlets of a PAM automatic dissolving medicine box 2.1 and a PAC automatic dissolving medicine box 2.4.

As shown in fig. 1, the top of the valveless filter 4 is also connected with a forced backwashing electric valve 4.1, the valveless filter 4 is provided with a backwashing tuning fork level meter through a backwashing tuning fork level 4.2 to monitor backwashing frequency, backwashing is carried out through the forced backwashing electric valve 4.1 after the frequency is lower than a set value, and backwashing water is discharged through a sewage discharge outlet 4.6.

As shown in figure 1, when the valveless filter 4 filters, the water from the hydraulic circulation clarifier 3 flows into the siphon ascending pipe through the water inlet pipe after passing through the water inlet and distribution tank, and the water flows downwards in the siphon ascending pipe and is uniformly distributed on the filter material layer through the water baffle plate below the top cover, and passes through the filter material layer and the supporting layer;

the bottom of the valveless filter 4 is sequentially provided with (a) a bearing layer from bottom to top: sequentially comprises a bearing plate and a stainless steel water filtering cap; (b) a filter material layer: sequentially comprises natural pebbles and natural quartz sand. Wherein, the natural pebbles are provided with three layers according to the gradation, and the natural quartz sand is provided with two layers according to the gradation; the natural pebbles are divided into natural pebbles with the thickness of 100 mm to 8mm, natural pebbles with the thickness of 100 mm to 4mm, natural quartz sand with the thickness of 350 mm to 1 mm and natural quartz sand with the thickness of 150mm to 0.6 mm to 1.2mm from bottom to top in sequence.

The middle water tank 6.1 is communicated with a sludge dewatering system 6, the sludge dewatering system 6 comprises a sludge concentration tank 6.3, the bottom of the middle water tank 6.1 is communicated with the sludge concentration tank 6.3 through a fifth water outlet 6.9, a sludge lifting pump 6.2 driven is arranged at the fifth water outlet 6.9,

the sludge inlet pipe of the sludge concentration tank 6.3 is inserted into the tank to a depth which is half of the total depth, the sludge discharge pipe adopts a branch-shaped perforated pipe, and the diameter of an opening is not less than 12 mm; the water is distributed by branch-type water distribution pipes, the pipe diameters of the branch-type water distribution pipes are sequentially reduced along the water flow direction, and the branch-type water distribution pipes are uniformly distributed; the effluent of the sludge concentration tank 6.3 adopts a peripheral effluent weir trough and is provided with an effluent scum baffle.

As shown in figure 1, a first ultrasonic liquid level meter 6.4 is arranged at the top of a middle water pool 6.1, a second ultrasonic liquid level meter 6.5 and a second ultrasonic sludge level meter 6.14 are arranged at the top of a sludge concentration pool 6.3, the outlet side of the sludge concentration pool 6.3 is communicated with a sixth water outlet 6.10, a sludge pump 6.6 and a sludge outlet valve 6.12 are arranged at the position of the sixth water outlet 6.10, the outer end of the sixth water outlet 6.10 is communicated with a sludge dewatering device,

in the embodiment, the sludge dewatering device is a spinning dewatering machine 6.8, and filtrate of the spinning dewatering machine 6.8 is returned to the middle water pool 6.1 through a seventh water outlet 6.11 on the spinning dewatering machine; the outlet end of the PAM automatic dissolving medicine box 2.1 is also communicated with the mud inlet end of the spinning dehydrator 6.8 through a PAM pump 6.7 and a PAM feed valve 6.13.

As shown in fig. 1, the supernatant of the sludge concentration tank 6.3 is communicated to a reclaimed water lift system 7, the reclaimed water lift system 7 comprises a reclaimed water tank 7.1, the outlet side of the reclaimed water tank 7.1 is connected with an eighth water outlet 7.3, and the eighth water outlet 7.3 is communicated to the top of a rotary mixer 1.2 through a reclaimed water pump 7.2.

The water supply valve 1.6, the PAM feed valve 2.3, the PAC feed valve 2.6, the first electric mud valve 3.2, the second electric mud valve 3.3, the forced back-flushing electric valve 4.1, the sludge outlet valve 6.12 and the PAM feed valve 6.13 are all electric valves, so that the automatic operation of the whole set of system can be conveniently controlled in the future, and the manual operation is further reduced.

A method for preparing make-up water of circulating cooling water of a power plant, as shown in figures 1 and 2, comprises the following steps,

s1: opening a river water lift pump 1.1, pumping the river water to a rotary mixer 1.2, measuring the turbidity of the taken water by a river water turbidimeter 1.7 arranged at the front end of the rotary mixer 1.2, automatically adding or manually setting the adding amount according to a set program, and automatically starting a chemical adding mechanical mixing system 2 when the turbidity of the taken water is more than or equal to 500NTU to enhance the coagulation effect; PAC is added, PAM is added after the PAC neutralizes charges and colloid is destabilized to form fine flocs, and the floc volume is further increased;

PAC feeding point is arranged at the front end of the rotary mixer 1.2, and PAM feeding point is arranged in the middle of the rotary mixer 1.2; fully coagulating and reacting in a rotary mixer 1.2, and adding PAC10mg/L and PAM1.2mg/L;

s2: s1, flocculating the coagulated water by a hydraulic circulating clarification tank 3 and removing colloid in the water, filtering the separated clear water by a valveless filter 4, allowing the filtered water in the valveless filter 4 to flow to a water production tank 5.1 through a water outlet, and automatically backwashing the water to flow to a middle water tank 6.1;

fully mixing the materials by a rotary mixer 1.2, clarifying by a hydraulic circulating clarification tank 3, storing sludge at the bottom of the tank body, and discharging the sludge to an intermediate water tank 6.1 through a gravity sludge discharge pipe;

wherein the clarification tank is a hydraulic circulating clarification tank 3, a throat pipe adjusting device is arranged, and the adjusting height range is not less than 400 mm; the coagulated river water enters from the bottom of the hydraulic circulating clarification tank 3, is sprayed into a throat pipe at the flow rate of 7.5m/s through a nozzle, vacuum suction active suspended sludge is formed near a bell mouth at the lower part of the throat pipe, and raw water and return sludge are quickly mixed in the throat pipe and enter a first reaction chamber and a second reaction chamber;

finishing flocculation process in the first reaction chamber and the second reaction chamber, wherein destabilizing impurities are retained by active sludge through contact flocculation, a sludge-water mixture in the second reaction chamber passes through a sedimentation zone, and clear water rises at a flow velocity of 1.0mm/s in a clear water zone after sludge-water separation and is collected by a water collecting tank to enter the gravity type valveless filter 4;

one part of the separated active sludge enters the first reaction chamber through backflow, the other part of the residual sludge is judged for sludge height and sludge concentration through the first ultrasonic sludge level meter 3.1 and the sludge concentration meter 3.7, automatic sludge discharge is realized through the first electric sludge discharge valve 3.2 and the second electric sludge discharge valve 3.3, and the single sludge discharge time is set to be 0.5 h;

s3: pumping water in the intermediate water tank 6.1 to a sludge concentration tank 6.3 through a lifting pump, treating sludge water in the sludge concentration tank 6.3 through a sludge dewatering device, transporting a sludge cake outwards, and returning filtrate to the intermediate water tank 6.1;

wherein, the backwashing water or the sludge discharge of the hydraulic circulation clarifying tank 3 and the valveless filter tank 4 are pumped to a sludge concentration tank 6.3 by a sludge lifting pump 6.2 through an intermediate water tank 6.1, and then the sludge is dewatered by a PAM pump 6.7 and a spinning dewaterer 6.8, and the dewatered sludge is transported for external disposal.

S4: the supernatant fluid of the sludge concentration tank 6.3 enters a middle water tank 7.1 and is lifted to the top end of the rotary mixer 1.2 again;

wherein, the supernatant liquor of the sludge concentration tank 6.3 automatically flows to the reclaimed water tank 7.1, and then is pumped to the inlet of the rotary mixer 1.2 by the reclaimed water pump 7.2.

The circulating cooling water make-up water preparation system has the advantages of simple process unit, reliable technology, compact and reasonable structure, high automation degree, low equipment requirement, low labor intensity, high water production stability, low maintenance frequency, high economical efficiency and high practicability;

external water sources are not needed, and production water of each unit in the process is from a water production tank 5.1; the continuous operation results show that: the turbidity of the system produced water is less than or equal to 7NTU, the highest turbidity of the incoming water reaches 650NTU, the maximum removal rate reaches 98.9 percent, the monthly average medicament usage amount PAC10mg/L and PAM1.2mg/L;

an external water source is not needed in the production process, and only qualified produced water and dehydrated sludge are produced as system products, so that the energy-saving and emission-reducing effects are remarkable.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a recirculated cooling water make-up water preparation system of power plant which characterized in that: comprises a rotary mixer (1.2), the rotary mixer (1.2) is communicated with a river water lift pump (1.1) for pumping river water into the rotary mixer and a drug adding mechanical mixing system (2) for adding drugs, a water outlet of the rotary mixer (1.2) is communicated with a clarification tank,

clear water separated from the clarification tank is introduced into the valveless filter (4), filtered water of the valveless filter (4) is communicated to a water production tank (5.1) through a water outlet, the water production tank (5.1) is conveyed to each water using point through a water supply pump, and the valveless filter (4) is communicated to a middle water tank (6.1) through a sewage discharge outlet (4.6);

the intermediate water tank (6.1) is communicated with a sludge concentration tank (6.3), the sludge concentration tank (6.3) is communicated with a sludge dewatering device through a sludge pump (6.6), and filtrate of the sludge dewatering device is returned to the intermediate water tank (6.1); the supernatant of the sludge concentration tank (6.3) is communicated to a middle water tank (7.1), and the middle water tank (7.1) is communicated to a rotary mixer (1.2) through a middle water pump (7.2).

2. The system of claim 1, wherein the system comprises: the drug-adding mechanical mixing system (2) comprises a PAC adding pump (2.5) for adding PAC and a PAM adding pump (2.2) for adding PAM.

3. The system for preparing the circulating cooling water make-up water of the power plant according to claim 1 or 2, characterized in that: the river water lift pump (1.1) inlet is communicated with the river channel water intake (1.4), and a river water turbidity meter (1.7) is further arranged at the river channel water intake (1.4).

4. The system of claim 1, wherein the system comprises: the mud discharging side of the clarification tank is communicated to a middle water tank (6.1) through a plurality of electric mud discharging valves.

5. The system for preparing the circulating cooling water make-up water of the power plant according to claim 1 or 4, wherein: a forced backwashing electric valve (4.1) is arranged on the valveless filter (4), the valveless filter (4) monitors backwashing frequency through a backwashing tuning fork material level (4.2), backwashing is carried out through the forced backwashing electric valve (4.1) after the frequency is lower than a set value, and backwashing water is discharged through a drain outlet (4.6).

6. The system of claim 1, wherein the system comprises: the bottom of the valveless filter (4) is sequentially provided with a bearing plate, a stainless steel water filtering cap, natural pebbles and natural quartz sand from bottom to top, wherein the natural pebbles are provided with three layers according to the gradation, and the natural quartz sand is provided with two layers according to the gradation.

7. The system of claim 1, wherein the system comprises: the water consumption point comprises a dosing mechanical mixing system (2).

8. The system of claim 1, wherein the system comprises: the depth of the sludge inlet pipe of the sludge concentration tank (6.3) inserted into the tank is half of the total depth, and the sludge discharge pipe adopts a branch-shaped perforated pipe.

9. A preparation method of circulating cooling water make-up water of a power plant is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

s1: opening a river water lift pump (1.1), pumping the river water to a rotary mixer (1.2), firstly adding PAC, and after the PAC neutralizes charges and colloid is destabilized to form fine flocs, adding PAM to further increase the volume of the flocs;

s2: s1, flocculating the coagulated water in the clarifying tank and removing colloid in the water, filtering the separated clear water in a valveless filter (4), allowing the filtered water in the valveless filter (4) to flow to a water production tank (5.1) through a water outlet, and automatically backwashing the water to flow to a middle water tank (6.1);

s3: water in the intermediate water tank (6.1) is pumped to a sludge concentration tank (6.3) through a lift pump, sludge water in the sludge concentration tank (6.3) is treated by a sludge dewatering device, sludge cakes are transported outside, and filtrate returns to the intermediate water tank (6.1);

s4: the supernatant of the sludge concentration tank (6.3) enters a middle water tank (7.1) and is lifted to the rotary mixer (1.2) again.

10. The method for preparing the make-up water of the circulating cooling water of the power plant according to claim 9, characterized in that: in the step S2, the clarification tank is a hydraulic circulation clarification tank (3), the coagulated river water enters from the bottom of the hydraulic circulation clarification tank (3), is firstly sprayed into a throat pipe through a nozzle, vacuum suction active suspended sludge is formed near a bell mouth at the lower part of the throat pipe, and raw water and return sludge are quickly mixed in the throat pipe and enter a first reaction chamber and a second reaction chamber;

finishing flocculation process in the first reaction chamber and the second reaction chamber, wherein destabilizing impurities are retained by active sludge through contact flocculation, a sludge-water mixture in the second reaction chamber passes through a sedimentation zone, and clear water rises in a clear water zone after sludge-water separation and is collected by a water collecting tank to enter a gravity type valveless filter (4);

and one part of the separated active sludge enters the first reaction chamber through backflow, the other part of the residual sludge judges the sludge height and the sludge concentration through the first ultrasonic sludge level meter (3.1) and the sludge concentration meter (3.7), and sludge is discharged through a plurality of electric sludge discharge valves.

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