JPH11344295A - Piping system using frictional resistance decreasing agent for aqueous medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat waste water of aqueous medium at a low price by installing an adsorption tank filled with active carbon, a passage extending from an ordinary circulating passage to the adsorption tank, and a passage returning from the adsorption tank to the circulating passage. SOLUTION: A piping system 10 uses cooling water cooled by a cooling tower 13 for exchanging heat by a refrigerating machine 11, and aqueous medium containing frictional resistance decreasing agent is circulated by a pump 19 through a circulating passage 17 connecting these components. In this case, a passage 32 extending from the circulating passage 17 to the adsorption tank 30, and a passage 34 returning from the adsorption tank 30 to the circulating passage 17 are installed. Active carbon is filled in the adsorption tank 30. When purifying waste water, after valves 40 and 42 are opened and a valve 44 is closed, the water medium is caused to circulate by the pump 19 through passages 32 and 34, and the frictional resistance decreasing agent is caused to be adsorbed to the active carbon of the absorption tank 30. As a result, the waste water of the water medium is treated at a low price.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe system using an aqueous medium containing a frictional resistance reducing agent, whereby an aqueous medium containing a frictional resistance reducing agent for an aqueous medium can be efficiently and economically treated. About possible piping systems.

[0002]

2. Description of the Related Art In a heat medium transfer system for cooling and heating, a heat medium transfer system for production in factories, and the like, the length of piping is long, the cost of piping equipment is enormous, and the power for water transport is increased. The transportable distance is shorter. As an advantageous method for reducing the equipment cost and reducing the water transfer power, it is conceivable to reduce the pipe resistance of the water flowing in the pipe. Therefore, a method of adding a polymer or a special surfactant to an aqueous medium has been developed, and many proposals have been made on additives so far. For example, Japanese Patent Publication No. 4-6231, Japanese Patent Publication No. 5-47534,
JP-A-60-99199 and the like. However, the polymer added as an additive is inevitably subjected to mechanical deterioration, particularly breakage of the polymer chain, and as a result, the deteriorated additive remains in the fluid in the tube. When a surfactant is used as an additive, mechanical deterioration hardly occurs, and the surfactant can be used for a longer period than a polymer surfactant. However, even when a surfactant is used, other dirt also occurs in the piping, so that the aqueous medium needs to be periodically replaced in order to purify the inside of the piping. However, most of the frictional resistance reducing agents added to the aqueous medium cannot be drained as they are organic substances. Therefore, it was necessary to transfer the aqueous medium to another tank, transfer it to a wastewater treatment plant, remove the additive by activated carbon adsorption method or the like, and then drain it. Since this method transfers a large amount of aqueous medium, the transfer cost is high, and there is a problem in economy.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a piping system using an aqueous medium containing a frictional resistance reducing agent, in which the wastewater treatment of the aqueous medium containing the frictional resistance reducing agent is performed. It is an object of the present invention to provide a piping system that can be performed at low cost.

[0004]

SUMMARY OF THE INVENTION According to the present invention, wastewater treatment of a frictional resistance reducing agent for an aqueous medium can be performed on site by incorporating an adsorption device for bringing activated carbon into contact with an aqueous medium into a piping system. Things. That is, the present invention provides, in a piping system using an aqueous medium containing a frictional resistance reducing agent, an adsorption tank filled with activated carbon, a path from piping equipment to the adsorption tank, and a path from the adsorption tank to return to the piping equipment. This is a piping system using a frictional resistance reducing agent for an aqueous medium. The temperature at which the frictional resistance reducing agent is adsorbed by activated carbon in the adsorption tank is preferably 30 ° C. or higher. In another aspect of the present invention, the adsorption tank loaded with activated carbon is made to be a movable type that can be attached to and detached from piping equipment, and when performing wastewater treatment, the adsorption tank is connected to the piping equipment to perform wastewater treatment.

According to the present invention, since wastewater can be treated on site without being transferred to a wastewater treatment plant, a transfer system is not required, and an economically advantageous piping system can be provided.
Further, by making the adsorption tank movable so as to be detachable from the piping equipment, the installation space for the adsorption tank is not required, and the equipment cost of the piping system can be reduced, which is more economically advantageous. The adsorption tank used in the present invention can be installed at any position in the piping system. That is, it can be installed on the roof of a building, underground, or on the ground outside the building. Further, as described above, the adsorption tank may be of a movable type that is detachable. In addition, the position where the aqueous medium is taken in and taken out of the adsorption tank can be an upper position, a side surface, or a lower position of the adsorption tank, and is not particularly limited.

The present invention can be used in a piping system using a water-cooled refrigerator or an air-cooled refrigerator. In the case of a water-cooled refrigerator, the piping system of the water medium is used in both the piping system on the cooling water side and the piping system on the air conditioner side. Therefore, the present invention is applied to the piping system on both the cooling water side and the air conditioner side. Can be used. For an air-cooled refrigerator,
Since the piping system for the aqueous medium is used in the piping system on the air conditioner side, the present invention can be used in the piping system on the air conditioner side. The piping system using the present invention is not limited to the cooling and heating of a building, but may be any piping system using an aqueous medium containing a frictional resistance reducing agent. For example, there are a heating and cooling medium transfer system for performing district heating and cooling, and a production medium transfer system for factory production.

The frictional resistance reducing agent is not particularly limited as long as it is an organic compound that reduces frictional resistance. For example, a composition comprising a viscoelastic surfactant and an organic electrolyte described in JP-B-4-6231, JP-B 5-47534
And a composition containing a quaternary ammonium salt described in JP-A-8-231941. Specific examples include lauryltrimethylammonium chloride, cocoyltrimethylammonium chloride, mistoiltrimethylammonium chloride, palmityltrimethylammonium chloride, stearyltrimethylammonium chloride, oleyltrimethylammonium chloride, tallowtrimethylammonium chloride, ercitrimethylammonium chloride, myristoyl ( (Hydroxyl) dimethyl ammonium chloride, palmityl (hydroxyl) dimethyl ammonium chloride, stearyl (hydroxyl) dimethyl ammonium chloride, oleyl (hydroxyl) dimethyl ammonium chloride, tallow (hydroxyl) dimethyl ammonium chloride, erucyl (hydroxyl) dichloride Tillammonium chloride, myristoyldi (hydroxyl) methylammonium chloride, palmityldi (hydroxyl) methylammonium chloride, stearyldi (hydroxyethyl) methylammonium chloride, oleyldi (hydroxyethyl) methylammonium chloride, talodi (hydroxyethyl) methylammonium chloride, ercildi (Hydroxyethyl) methylammonium chloride, myristoyltri (hydroxyethyl) methylammonium chloride, palmityltri (hydroxy) ammonium chloride,

Stearyl tri (hydroxyethyl) ammonium chloride, oleyltri (hydroxyethyl) ammonium chloride, tallow tri (hydroxyethyl) ammonium chloride, ersyltri (hydroxyethyl) ammonium chloride, lauryltrimethylammonium hydroxide, cocoyltrimethylammonium hydroxide, myristoyltrimethyl Ammonium hydroxide, palmityltrimethylammonium hydroxide, stearyltrimethylammonium hydroxide, oleyltrimethylammonium hydroxide, tallowtrimethylammonium hydroxide, ersyltrimethylammonium hydroxide, myristoyl (hydroxyl) dimethylammonium hydroxide, palmityl (Hydroxyl) dimethylammonium hydroxide, stearyl (hydroxyl) dimethylammonium hydroxide, oleyl (hydroxyl) dimethylammonium hydroxide, tallow (hydroxyl) dimethylammonium hydroxide, ersyl (hydroxyl) dimethylammonium hydroxide, myristoyldi (hydroxyl) methylammonium Hydroxide, palmityl (hydroxy) methylammonium hydroxide, stearyldi (hydroxyethyl) methylammonium hydroxide, oleyldi (hydroxyethyl) methylammonium hydroxide,

Tarodi (hydroxyethyl) methylammonium hydroxide, erucyldi (hydroxyethyl) methylammonium hydroxide, myristoyltri (hydroxyl) ammonium hydroxide, palmityltri (hydroxyl) ammonium hydroxide,
Stearyl tri (hydroxyethyl) ammonium hydroxide, oleyltri (hydroxyethyl) ammonium hydroxide, tallowtri (hydroxyethyl) ammonium hydroxide, ersyltri (hydroxyethyl) ammonium hydroxide, myristyltrimethylammonium salicylate, palmityltrimethylammonium salicylate Rate, stearyl trimethyl ammonium salicylate, oleyl trimethyl ammonium salicylate, tallow trimethyl ammonium salicylate, palmityl (hydroxyl) dimethyl ammonium salicylate, stearyl (hydroxyl) dimethyl ammonium salicylate, tallow (hydroxyl) dimethyl ammonium salicylate Tyrates, palmityl (hydroxy) methyl Ammonium salicylate, stearyldi (hydroxyl) methylammonium salicylate, tarodi (hydroxyl) methylammonium salicylate, stearyltri (hydroxyl) ammonium salicylate, tallowtri (hydroxyl) ammonium salicylate, oleyltri (hydroxyl) ammonium Including, but not limited to, a mixture of one or more salts such as salicylate, and one or more salts such as sodium hydroxybenzoate, sodium hydroxynaphthoate, sodium salicylate, and the like. .

[0010] Further, as a frictional resistance reducing agent, JP-A-60-1985
-99199, JP-A-9-302324, and compositions containing an alkylamine oxide.
Specific examples include lauryl dimethylamine oxide, cocoyl dimethylamine oxide, myristoyl dimethylamine oxide, palmityl dimethylamine oxide,
Stearyl dimethyl amine oxide, oleyl dimethyl amine oxide, tallow dimethyl amine oxide, ersyl dimethyl amine oxide, stearyl di (hydroxyethyl) amine oxide, oleyl di (hydroxyethyl) amine oxide, talodi (hydroxyethyl)
Examples include, but are not limited to, one or a mixture of two or more of amine oxide, erucyldi (hydroxyethyl) amine oxide, and the like.

The concentration of the frictional resistance reducing agent added to the aqueous medium is not particularly limited, but it is generally preferred to use 50 to 10,000 ppm, more preferably 100 to 5000 ppm. If the amount is less than this range, the effect of reducing the frictional resistance becomes insufficient, and if the amount exceeds this range, the cost increases due to an increase in the amount used, instead of the effect of reducing the frictional resistance. It takes time to remove the frictional resistance reducing agent. In the aqueous medium used in the present invention, in addition to the frictional resistance reducing agent, various rust inhibitors such as amines for preventing corrosion of pipes, scale inhibitors for preventing contamination of pipes, metal chelating agents, and the like. Various solvents such as ethylene glycol can be added for use.

In the present invention, the activated carbon used in the adsorption tank may be any activated carbon generally used for adsorbing a surfactant or the like, and the particle shape and particle size are not particularly limited.
The amount of activated carbon used is required to be 1 to 100 times by weight, and preferably 5 to 50 times, of the frictional resistance reducing agent to be treated. If the amount is less than this range, not only does the processing time take longer, but also the frictional resistance reducing agent cannot be sufficiently removed. Even if it exceeds this range, there is a problem that the cost increases due to an increase in the amount of use instead of shortening the processing time. The treatment temperature for adsorbing a surfactant or the like in the aqueous medium may be within this temperature range, since the activated carbon adsorbs the surfactant or the like if the aqueous medium is a liquid. Is preferably in the range of 30 to 70 ° C. For this reason,
The piping system of the present invention can be provided with a heating source such as a heater for heating the aqueous medium in the piping system entering the adsorption tank as needed.

[0013]

Embodiments and examples of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a schematic diagram of Embodiment 1 of a piping system of the present invention in which an adsorption tank 30 is provided in a piping system 10 on a cooling water side in a cooling system using a water-cooled refrigerator.
This piping system 10 uses cooling water cooled by the cooling tower 13 and exchanges heat with the refrigerator 11 .A circulation path 17 that connects the cooling tower 13 and the refrigerator 11 is provided. Pump containing aqueous medium
Circulate by 19 This piping system has a normal circulation path 17
In addition, a path 32 from the circulation path to the adsorption tank 30 and a path 34 from the adsorption tank to the circulation path 17 are provided. Adsorption tank
30 is loaded with activated carbon. Circulation route 17 of routes 32 and 34
Valves 40 and 42 are provided in the vicinity of the part branched from the, and can be opened when purifying wastewater. Further, a valve 44 is provided in a portion of the circulation route 17 between the portions where the routes 32 and 34 are branched, so that the valve 44 can be closed when purifying waste water. When purifying wastewater in the piping system 10, the valves 40 and 42 are opened and the valve 44 is closed, the aqueous medium is circulated through the paths 32 and 34 by the pump 36, and the frictional resistance reducing agent is activated carbon in the adsorption tank 30. To be absorbed. Note that a heat pump may be provided instead of the refrigerator 11.

(Embodiment 2) FIG. 2 is a schematic diagram of Embodiment 2 of the piping system of the present invention in which an adsorption tank 30 is provided on the roof of a building in the piping system on the air conditioner side. This piping system 20
Is for circulating cold water cooled by the refrigerator 11 in the circulation path 27 and exchanging heat with the air conditioners 22, 24 on each floor. In the second embodiment, similarly to the first embodiment, a path 32 from the circulation path 27 to the adsorption tank 30 and a path 34 returning from the adsorption tank to the circulation path 27 are provided, and the adsorption tank 30 is loaded with activated carbon. is there. Further, similarly to the first embodiment, valves 40, 42 and a valve 44 are provided. When purifying wastewater in the circulation path 27 in this piping system 20, the aqueous medium in the circulation path 27 is circulated through the paths 32 and 34 by the pump 36, and the frictional resistance reducing agent is converted into activated carbon in the adsorption tank 30. Adsorb.

(Embodiment 3) FIG. 3 is a schematic view of Embodiment 3 and shows a movable adsorption tank unit in which the adsorption tank is detachable and movable in a piping system of the present invention used for a building cooling / heating system. The mobile adsorption tank unit is
It is housed in 53 and provided with wheels 55 so that the adsorption tank unit can be easily moved. This adsorption tank unit is provided with an adsorption tank 50 loaded with activated carbon. Further, a path 52 to the adsorption tank 50 and a path 54 to return from the adsorption tank are provided, and connection portions 60 and 62 are provided at the leading end of this path. In FIG. 3, the right side of the dashed line AA ′ represents the piping of the cooling and heating system. The connections 60, 62 can be connected to corresponding connections of the piping of the cooling and heating system. Valves near connections 60,62 in paths 52,54
56 and 58 are provided and can be opened and closed. In addition, a heater 51 is provided in a path 52 near the adsorption tank 50, so that an aqueous medium passing through the path 52 can be heated to increase the adsorption speed of activated carbon in the adsorption tank 50. ing. When performing wastewater treatment in this cooling and heating system, the connection sections 60 and 62 of the adsorption tank unit piping are connected to the corresponding piping connection sections of the cooling and heating system, and the valves 56 and 58 are connected.
And the valve of the piping on the cooling and heating system side is opened, the aqueous medium is sent from the cooling and heating system side to the adsorption tank 50 through the path 52 by the pump 57, and the frictional resistance reducing agent is adsorbed on the activated carbon in the adsorption tank, and the aqueous medium after adsorption is Is returned to the piping of the cooling and heating system to perform wastewater treatment. After the wastewater treatment, the valves 56 and 58 on the adsorption tank unit side and the corresponding piping valve on the cooling and heating system side are closed, and the connection sections 60 and 62 of the adsorption tank are removed from the connection sections on the cooling and heating system side. The connecting portions 60 and 62 can be connected by a known method so that the aqueous medium does not leak in the connected state.

Here, in order to investigate the friction reducing effect and the state of removal by activated carbon for various friction reducing agents, N in Table 1 was used.
o. Aqueous solutions to which a predetermined concentration of a friction reducing agent shown in 1 to 6 was added were prepared. For comparison, lauryl alcohol EO
Was added to prepare an aqueous solution. The friction reducing effect of these aqueous solutions and the time required for removing the friction reducing agent were measured. The friction reduction effect was evaluated based on the vortex reduction effect. Specifically, in a 200 ml beaker, 6 mm x 30 mm
Was stirred at a speed of 900 rpm, and the vortex depth (xcm) was determined according to the following criteria. The smaller the value of x, the greater the friction reducing effect. Table 2 shows the results. 0 = <x = <1: ◎ 1 <x = <2.5: ○ 2.5 <x = <4: △ 4 <x = <5: ×

The experiment for removing the friction reducing agent was carried out using an experimental circulating device as shown in FIG. This experimental apparatus has a tank 70 having a capacity of 10 liters, and an adsorption tank 72 containing 10 g of granular activated carbon for adsorption (special grade reagent, manufactured by Wako Co., Ltd.).
0 g is charged, and the aqueous solution is circulated by the pump 74 at a rate of 5 liter / min. Table 2 shows the COD of an aqueous solution in which these friction reducing agents were dissolved at a predetermined concentration.
Shown in Here, the value of COD was determined by measuring the COD of the sampled aqueous medium with a digital COD meter (HC-407 manufactured by Central Science Co., Ltd.). An aqueous solution having a predetermined concentration was circulated at a predetermined temperature at a rate of 5 L / min through the circulation device shown in FIG. 4, and the time required to adsorb the friction reducing agent was measured. The time required for adsorption is measured by periodically sampling the aqueous solution in the tank and measuring the COD (chemical oxygen demand), and is expressed as the time required for the COD to become 10 mg / l or less. Further, a friction reducing agent having the same concentration as the initial concentration was again added to the aqueous solution from which the friction reducing agent had been removed as described above, and the friction reducing effect was measured again. Table 2 shows the results.

Table 1 Kinds Compound name a Oleyldihydroxylmethylammonium chloride: Na salicylate = 1: 1 b Tallow trimethylhydroxyllammonium chloride: Na salicylate = 1: 1 c Oleyldimethylamine oxide d Oleyldihydroxylamine oxide e Lauryl alcohol EO 8 Mole

Table 2 Additives Aqueous medium Additive removal Friction reduction effect No. Kind Concentration COD Temperature Required time Removal After treatment (ppm) (mg / l) (° C) (hrs) Before treatment Re-addition 1a 800 558 25 10.1 ◎ ◎ Actual 2 a 800 558 40 4.0 ◎ ◎ Application 3 b 1000 773 25 13.7 ○ ○ Example 4 c 800 518 25 12.2 ○ 〜 ◎ ○ 〜 ◎ 5c 800 518 40 5.7 ○ 〜 ◎ ○ 〜 ◎ 6 d 800 522 25 9.2 ○ 〜 ◎ ○ 〜 ◎ Ratio 1 e 800 515 25 3.7 × × comparison 2 e 800 515 40 3.6 × × From the results in Table 2, all of the additives a, b, c, and d have good friction reducing effects. However, it can be seen that it can be used as the friction reducing agent of the present invention. Also, it can be seen that the time required for removing the friction reducing agent is shorter when the processing temperature is higher.

[0020]

As described above, according to the present invention, it is possible to obtain a piping system capable of performing inexpensive wastewater treatment of an aqueous medium containing a frictional resistance reducing agent.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a piping system on a cooling water side according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a piping system on an air conditioner side according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a suction tank unit according to a third embodiment of the present invention in which the suction tank is detachably movable.

FIG. 4 is a schematic diagram of a circulation device for an experiment for removing a frictional drag reducing agent.

[Explanation of symbols]

 10, 20 Piping system 11 Refrigerator 13 Cooling tower 15 Expansion tank 17 Circulation path 19 Pump 22, 24 Air conditioner 30, 50 Adsorption tank 32, 34 Path 36, 57 Pump 40, 42, 44 Valve 53 Frame 55 Wheel 56, 58 Valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hitoshi Sugawara 1-3-7 Honjo, Sumida-ku, Tokyo Inside Lion Corporation (72) Inventor Shigeo Nishihara 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo East (72) Inventor Minoru Kawashima 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (3)

[Claims] In a piping system using an aqueous medium containing a frictional resistance reducing agent, an adsorption tank filled with activated carbon, a path from a normal circulation path to the adsorption tank, and a return from the adsorption tank to the circulation path. A piping system using a frictional resistance reducing agent for an aqueous medium, which has a path. 2. The piping system according to claim 1, wherein said frictional resistance reducing agent is adsorbed by activated carbon in said adsorption tank at a temperature of 30 ° C. or higher. 3. The piping system according to claim 1, wherein the adsorption tank unit including the adsorption tank is detachable from the piping equipment and is movable.