CN106006797A - Evaporation condenser circulating water treatment method - Google Patents

Abstract

The invention relates to a method for treating circulating water of an evaporating condenser, which can treat the circulating water in the evaporating condenser, and can also treat the make-up water of the evaporating condenser. The invention can filter, sterilize and activate the circulating water of the evaporative condenser, prevent impurities in the circulating water, and soften the supplementary water, so as to fundamentally solve the scaling, corrosion and bacterial problems of the evaporative condenser.

Description

A kind of circulating water treatment method of evaporative condenser

technical field

The invention relates to a method for treating circulating water of an evaporative condenser, which belongs to the field of water treatment and is mainly used in conjunction with the evaporative condenser.

Background technique

The evaporative condensing chiller based on evaporative cooling technology has performed well in the actual use of central air-conditioning systems. It has been well received by users in terms of energy saving and emission reduction, green environmental protection, and economic operation, and its market share has risen rapidly.

However, since the evaporative condenser mainly relies on the evaporation and heat dissipation of the spray water, the evaporation of the spray cooling circulating water is large (accounting for 30% to 40% of the water retention), and the concentration is fast, so there are the following problems in the operation process: (1) ) Scaling problem, the scaling of the coil increases the thermal resistance, and the fouling blocks the nozzle, causing uneven water spraying and affecting cooling. (2) Corrosion problems affect normal operation. (3) Water quality control, the concentration caused by water evaporation, and the floating dust in the air will increase the chance of scaling after entering the circulating water body. (4) Bacterial problems, which may infect the surrounding population with the potential danger of Legionella.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a method for treating the circulating water of the evaporative condenser, which can filter, sterilize and activate the circulating water of the evaporative condenser to prevent impurities from appearing in the circulating water, and fundamentally solve the problem of Scaling problems, corrosion problems and bacterial problems of evaporative condensers.

The technical scheme adopted in the present invention is:

A method for treating circulating water in an evaporative condenser, comprising an evaporative condenser, the evaporative condenser is provided with a water inlet and a water outlet, the water outlet is directly connected to the water tank of the evaporative condenser, and the water inlet directly communicated with the water tank, or the water inlet communicated with the spray system of the evaporative condenser,

The method includes:

Pump out the circulating water in the water tank through the water outlet;

Filtration treatment: The pumped circulating water is filtered and then sent to the evaporative condenser through the water inlet.

Preferably, the present invention may also include, sterilization treatment: subjecting the filtered circulating water to sterilization treatment;

Activation treatment: Activate the filtered circulating water.

Preferably, sterilization treatment and activation treatment can be selected one by one; or, sterilization treatment and activation treatment can be selected at the same time, and when sterilization treatment and activation treatment are selected at the same time, there is no sequence of sterilization treatment and activation treatment, or sterilization treatment and activation treatment Processing takes place simultaneously.

Preferably, a filter bag is used for the filtration treatment; an ultraviolet germicidal lamp is used for the sterilization treatment in the sterilization treatment step; and a radio frequency electrode energy converter is used for the activation treatment in the activation treatment step.

The present invention also includes a circulating water comprehensive treatment tank, and the filtering treatment step, the sterilization treatment step and the activation treatment step are all carried out in the circulating water comprehensive treatment tank.

Before sending the treated circulating water into the evaporative condenser through the water inlet, it is necessary to test the conductivity, pH and Cl- of the circulating water, and judge whether to discharge the circulating water to the outside according to the actual detection values.

At the same time, before sending the treated circulating water into the evaporative condenser through the water inlet, it is necessary to test the conductivity, pH and Cl- of the circulating water, and judge whether to discharge the circulating water to the outside according to the actual detection values;

The way to discharge circulating water to the outside is to control the opening of the sewage discharge port on the comprehensive treatment tank for circulating water, so as to realize the discharge of circulating water.

The present invention also includes

Softening treatment: Send tap water into the softening tank for softening treatment to obtain supplementary water;

The evaporative condenser supplements the evaporated water: the supplementary water is sent into the evaporative condenser through the supplementary water inlet of the evaporative condenser to supplement the water evaporated by the evaporative condenser.

Beneficial effects of the present invention:

The invention can filter, sterilize and activate the circulating water of the evaporating condenser, prevent impurities from appearing in the circulating water, and fundamentally solve the fouling, corrosion and bacterial problems of the evaporating condenser.

Description of drawings

Fig. 1 is a flow chart of the present invention;

Fig. 2 is a cross-sectional view of the circulating water comprehensive treatment tank.

Among them: 2. Circulating water comprehensive treatment tank; 21. Circulating water inlet; 22. Circulating water outlet; 23. Filter bag; 24. Ultraviolet germicidal lamp; 25. Radio frequency electrode energy converter.

detailed description

Referring to Fig. 1 and Fig. 2, the present invention provides a method for treating the circulating water of the evaporative condenser, which can treat the circulating water in the evaporative condenser, and can also treat the make-up water of the evaporative condenser.

These two aspects will be elaborated in the following

Regarding the treatment of circulating water:

Since the circulating water is circulated in the evaporative condenser, and during the process of use, the dust in the outside air can easily enter the water tank (circulating water), and the accumulation of dust will cause sticky sludge in the evaporative condenser , and in the process of circulating water circulation, bacteria are easy to breed in circulating water, and scale-forming ions in circulating water will also form large hard scale during the process of circulation, and then adhere to the evaporative condenser.

In order to solve the above problems, we need to treat the circulating water.

The specific method is:

(1) The evaporative condenser is provided with a water inlet and a water outlet, the water outlet is directly connected with the water tank of the evaporative condenser, the water inlet is directly connected with the water tank, or the water inlet It communicates with the spray system of the evaporative condenser.

In this way, we can export the circulating water in the evaporative condenser, and process the exported circulating water conveniently.

(2) The extracted circulating water is sent to the evaporative condenser through the water inlet after being filtered.

In this step, filter bag 23 is usually used to filter the circulating water, thus preventing the formation of sludge on the evaporative condenser, and also preventing corrosion under scale.

(3) Sterilize the filtered circulating water.

This step is usually achieved by using an ultraviolet germicidal lamp 24 .

Ultraviolet wavelengths in the range of 240-280nm most damage the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in bacteria and viruses, causing growth cell death and (or) regenerative cell death, to achieve the effect of sterilization . Especially when the wavelength is 253.7nm, the bactericidal effect of ultraviolet rays is the strongest. The ultraviolet emission wavelength of the equipment is in the range of 200-290nm, which can effectively inactivate the bacteria existing in the circulating water.

Since the bacteria can be effectively killed, it can prevent the surrounding people from being infected with the bacteria, and it can also prevent the bacteria from corroding the evaporation condenser.

In addition, due to the activity of bacteria, a large amount of biological slime will be produced, and killing the bacteria can also solve the generation of slime.

(4) Activate the filtered circulating water.

This step is usually implemented by using a radio frequency electrode energy converter 25 .

The radio frequency electrode energy converter 25 transmits radio frequency energy of a specific frequency into the water, distorting and deforming the arrangement order of the scale-forming ions to form loose and powdery scale without forming large hard scale.

Simply put, it can improve the dissolution rate of circulating water for scaling substances and prevent the precipitation of scaling ions in circulating water.

What needs to be explained here is that there is no sequence between step (3) and step (4). Of course, these two steps can also be carried out at the same time, or one of them can be selected.

(5) Detect the treated circulating water, the detected parameters are conductivity, PH and Cl-, and judge whether to discharge the circulating water to the outside according to the actual detected values.

According to the actual value detected by the detection device, refer to the comparison value. If the conductivity is too high (higher than the reference value), it means that the circulating water in the evaporating condenser can no longer be recycled. At this time, the circulating water needs to be discharged. Of course It is also necessary to inject make-up water (which can be tap water or softened tap water) into the evaporative condenser (injection amount = discharge amount), so as to control the conductivity to a specified value range.

Similarly, the pH value and Cl- also refer to the electrical conductivity, and will not be repeated here.

(6) Pump the treated circulating water into the evaporative condenser through the water inlet.

It should be emphasized that the filtration treatment (step (2)), sterilization treatment (step (3)) and activation treatment (step (4)) can be completed in the same equipment, which is the circulating water comprehensive treatment tank 2 .

Referring to Fig. 2, the circulating water comprehensive treatment tank 2 is provided with a circulating water inlet 21 and a circulating water outlet 22, and the circulating water inlet 21 is located at the top of the circulating water comprehensive treatment tank 2, and the circulating water outlet 22 is located at the circulating water comprehensive treatment tank 2. At the bottom of the treatment tank 2, the water inlet channel in the middle of the filter bag 23 is directly connected with the circulating water inlet 21. In the comprehensive treatment tank 2 for circulating water, the outside of the filter is an auxiliary treatment space, and an ultraviolet sterilizer is installed in the auxiliary treatment space. Lamp 24 and RF electrode energy converter 25.

Of course, the bottom of the comprehensive circulating water treatment tank 2 can also be provided with a sewage outlet to facilitate the discharge of circulating water to the outside in step (5).

The treated circulating water can be directly sent to the water tank of the evaporative condensation system or the spray system of the evaporative condensation system.

When the treated circulating water is sent to the spray system of the evaporative condensation system, it can ensure that all the water sprayed from the spray system has been treated, thereby greatly reducing the chance of fouling on the evaporative condenser.

About supplemental water

Since a large amount of water evaporates during the use of the evaporative condenser, it is necessary to replenish the amount of water in the evaporated part, and most of the existing replenished water is tap water, which contains a large amount of Ca ²⁺ and Mg ²⁺ , and the water will become insoluble calcium carbonate (CaCO ₃ ) and magnesium hydroxide (Mg(OH) ₂ ) to precipitate when heated, and sometimes MgCO ₃ will also be generated and attached to the heat exchange tube of the evaporative condenser. Treat tap water.

Specifically, it is to soften the supplementary tap water: send the tap water into the softening tank for softening treatment to obtain supplementary water; then send the supplementary water into the evaporative condenser through the supplementary water inlet of the evaporative condenser to supplement the evaporative condenser evaporated moisture.

The soft water tank is filled with ion exchange resin, which usually accounts for 50%-90% of the volume of the whole soft water tank. The tap water inlet is usually located on the top of the soft water tank, and the soft water outlet is located at the bottom of the soft water tank. Tap water enters the soft water tank through the tap water inlet, and tap water enters the soft water tank from the upper part. The tap water contacts with the ion exchange resin, so that the hardness components Ca ²⁺ and Mg ²⁺ in the water exchange with Na ⁺ in the resin, thereby adsorbing the water Ca ²⁺ , Mg ²⁺ , so that the water is softened, and the hardness of the softened water must be ≤0.05mmol/L.

Then the softened tap water is sent to the evaporative condenser. Since the water sent to the evaporative condenser contains less Ca ²⁺ and Mg ²⁺ , the occurrence of scaling can be greatly reduced.

Claims (8)

1. A method for treating circulating water in an evaporative condenser, comprising an evaporative condenser, characterized in that: the evaporative condenser is provided with a water inlet and a water outlet, and the water outlet is directly connected to the water tank of the evaporative condenser communicated, the water inlet is directly communicated with the water tank, or the water inlet is communicated with the spray system of the evaporative condenser, The method includes: Pump out the circulating water in the water tank through the water outlet; Filtration treatment: The pumped circulating water is filtered and then sent to the evaporative condenser through the water inlet. 2. according to the described evaporative condenser circulating water treatment method of claim 1, it is characterized in that: Sterilization treatment: Sterilize the filtered circulating water; Activation treatment: Activate the filtered circulating water. 3. The circulating water treatment method of evaporative condenser according to claim 2, characterized in that: sterilization treatment and activation treatment can be selected; or, sterilization treatment and activation treatment can be selected at the same time, and at the same time of sterilization treatment and activation treatment When selecting, there is no sequence of sterilization treatment and activation treatment, or sterilization treatment and activation treatment are carried out at the same time. 4. The evaporative condenser circulating water treatment method according to claim 2, characterized in that: in the filtration process, filter bags are used to filter; in the sterilizing process, ultraviolet germicidal lamps are used to sterilize; in the activation process The activation treatment is carried out by radio frequency electrode energy converter. 5. The method for treating circulating water of an evaporative condenser according to claim 4, characterized in that: a comprehensive circulating water treatment tank is included, and the filtration treatment step, the sterilization treatment step and the activation treatment step are all in the comprehensive circulating water treatment tank conduct. 6. The method for treating circulating water in an evaporative condenser according to claim 1, characterized in that: before the treated circulating water is sent into the evaporative condenser through the water inlet, it is also necessary to detect the conductivity, pH and Cl _- , and judge whether to discharge circulating water to the outside according to the actual detection value. 7. The evaporative condenser circulating water treatment method according to claim 5, characterized in that: before the treated circulating water is sent into the evaporative condenser through the water inlet, it is also necessary to detect the electrical conductivity, pH and Cl _- , and judge whether to discharge circulating water to the outside according to the actual detection value; The way to discharge circulating water to the outside is to control the opening of the sewage discharge port on the comprehensive treatment tank for circulating water, so as to realize the discharge of circulating water. 8. The evaporative condenser circulating water treatment method according to claim 1, characterized in that: it also includes Softening treatment: Send tap water into the softening tank for softening treatment to obtain supplementary water; The evaporative condenser supplements the evaporated water: the supplementary water is sent into the evaporative condenser through the supplementary water inlet of the evaporative condenser to supplement the water evaporated by the evaporative condenser.