KR102022089B1 - Degassing apparatus - Google Patents

Abstract

The task is to further enhance the removal of dissolved oxygen, free carbon and residual chlorine in open degassers and to improve the corrosion protection of copper or copper tubes in circulating hot water systems. The present invention relates to an open type degassing apparatus for removing dissolved oxygen, free carbon, and residual chlorine from water supply circulating in a circulation hot water supply system, comprising: a tank having a water storage portion below and an air stagnation portion above; A water supply pipe for introducing water supplied from the outside into the air stagnation part in the tank, a spray nozzle mounted at the tip of the water supply pipe, and spraying the supplied water supply into the air stagnation part in a spray form; A drain pipe for discharging water to the outside of the open degassing unit, an intake pipe for introducing air from the atmosphere outside the tank to the air stagnation part in the tank, and an exhaust pipe for discharging air from the air stagnation part in the tank to the atmosphere outside the tank The distance between the intake and exhaust ports of the intake pipe and the exhaust inlet of the exhaust pipe It was set as the open type degassing apparatus of the structure arrange | positioned so that it may become maximum in a sieving space.

Description

Degasser {DEGASSING APPARATUS}

The present invention relates to an open type degassing apparatus for removing dissolved oxygen, free carbon, and residual chlorine in a feedwater circulating in a circulation hot water supply system.

In a hot water supply system in a large building such as a hotel, a hospital, or a collective house, a forced hot water supply system of a central hot water supply system is often adopted. As shown in FIG. 1, the circulation hot water supply system is generally a supply pipe 2 which is a pipe from the hermetic storage tank 1 and the hermetic storage tank 1 to each hot water supply field 5. And a return pipe 3, an expansion tank 4, and a circulation pump 6, which are pipes from the front end of each hot water supply field 5 to the closed type water storage tank 1, respectively.

In this configuration, the water stored in the high-priced water tank (7) is sent to and heated in a closed water storage tank installed on the ground or underground, and the hot water from this closed water storage tank is supplied to each room and equipment through the supply pipe (2). Used by opening of the hot water supply 5, excess hot water is returned to the closed water storage tank 1 through the return pipe 3 and heated again, and water is used from the high price water tank 7 to the closed water storage tank 1 as much as used. Is replenished. FIG. 1 is an example of a downward hot water supply system in which a circulation pump is provided in a lower layer, and in the hot water supply system of FIG. 1, water sent to the closed water storage tank 1 is heated in the boiler 8. 9 is a circulation pump for sending water from the closed water storage tank 1 to the boiler 8 and for sending hot water heated from the boiler 8 to the closed water storage tank 1.

In such a circulation hot water supply system, copper pipes or copper alloy pipes such as phosphorous copper are often used as pipes such as supply pipes and return pipes. Copper and copper alloy pipes are used because they have excellent antibacterial properties against bacteria such as Legionella bacteria, and have excellent workability. Because it is granted. However, when copper pipes or copper alloy pipes are used as the piping material for the circulation hot water supply system, depending on the operating environment and operating conditions, it is possible to cause problems of leakage due to corrosion such as type II formula or erosion. Is being experienced.

The cause of corrosion of the copper pipe or copper alloy pipe is known to be caused by dissolved oxygen, free carbon, and residual chlorine in the conventional water supply, and an open degassing device is installed in the middle of the circulation pipe of the circulation hot water supply system. It is proposed to suppress corrosion by separating and removing (see Patent Literature 1 as an example).

In the conventional type of open type degassing apparatus, it is provided with a closed type water storage tank, a supply pipe which is a pipe from the said closed type water storage tank to each hot water supply field, a return pipe which is a pipe from the front end of each hot water supply field to a closed type water storage tank, and a circulation pump. Circulating hot water supply system, which is an open degassing device for removing dissolved oxygen, free carbon, and residual chlorine in a water supply flowing through a circulating hot water supply system, is installed in a supply pipe and / or a return pipe, A water supply pipe which communicates with a tank having an air stagnation on its upper surface, a sealed water tank, and discharges the water supplied from the tip end to the closed water tank to the air stagnation in a bubbled state, and supplies the treated water to the supply pipe from the reservoir of the tank. One end of the drain pipe extends upward through the center of the reservoir near the bottom of the tank, At the same time, the other end has an intake pipe open to the atmosphere outside the tank, one end is open to the air stagnant part of the tank, and the other end is provided with an exhaust pipe open to the atmosphere outside the tank. The supplied water is discharged into the stagnant air in the tank to vaporize it, separated from the dissolved oxygen, free carbon, and residual chlorine contained in the water supply, falling into the water reservoir in the tank, and falling into the reservoir in the tank, through the supply pipe and / or the return pipe. It was configured to be supplied with.

Japanese Patent Laid-Open No. 2010-255882

However, in the open type degassing apparatus of the prior art, it was possible to remove dissolved oxygen, free carbon, and residual chlorine from the feedwater circulating in the circulation hot water supply system, but their removal is not necessarily sufficient, so that the copper tube or There is a problem that the corrosion of the copper alloy tube can not be completely prevented.

Moreover, in the open type degassing apparatus of the conventional system, the problem that the circulation amount of the air which circulates through the air stagnation part of a tank is not enough, and water droplets invade from the end part of the air stagnation part side of an intake pipe, and the end part of the air stagnation part side of an exhaust pipe. There is also a problem of degrading the function of the supply pipe and the exhaust pipe.

The present invention has been made to solve this problem. In particular, studies have been made on the problem that dissolved oxygen, free carbon and residual chlorine cannot be sufficiently removed, and the degree of removal of dissolved oxygen, free carbon and residual chlorine, and the end portion of the air stagnation part of the intake pipe, The present invention has emerged by showing that a very important causal relationship exists between the distance between the end of the exhaust pipe and the end of the air stagnation part.

That is, this invention makes it a subject to improve the removal function of dissolved oxygen, free carbon, and residual chlorine in an open type degassing apparatus, and to improve the corrosion prevention effect of the copper pipe or copper alloy pipe of a circulation hot water supply system.

That is, in order to solve the said subject, in the invention which concerns on the 1st viewpoint of this invention, in the open type degassing apparatus for removing dissolved oxygen, free carbon, and residual chlorine from the water supply which distribute | circulates a circulation hot water supply system, a water storage part below And a tank having an air stagnation upward, a water supply pipe for introducing water supplied from the outside of the open type degassing apparatus into the air stagnation section in the tank, and a water supply mounted and supplied to the tip of the water supply pipe to the air stagnation section. A spray nozzle for ejecting in the form, a drain pipe for discharging the treated water collected in the reservoir in the tank to the outside of the open degassing apparatus, an intake pipe for introducing air from the atmosphere outside the tank to the air stagnation in the tank, An exhaust pipe for discharging air from the air stagnation part in the tank into the atmosphere outside the tank; The distance between the exhaust inlet of the intake pipe and the exhaust pipe outlet was set to gaebangsik degassing apparatus of the structure arranged such that the maximum in the stagnant air space portion.

Moreover, in the invention which concerns on the 2nd viewpoint of this invention, an air-retention part has a rectangular parallelepiped shape, arrange | positions the intake_outlet of the intake pipe in the vicinity of either one of a pair of mutually opposing sides, and has the other side It was set as the open type degassing apparatus of the structure which arrange | positioned the exhaust_inlet of an exhaust pipe in the vicinity.

Moreover, in the invention which concerns on the 3rd viewpoint of this invention, in the open type degassing apparatus of invention which concerns on a 1st or 2nd viewpoint, it was set as the open type degassing apparatus of the structure which arrange | positioned the blowing fan in the vicinity of the intake inlet of an intake pipe.

Further, in the invention according to the fourth aspect of the present invention, in the open degassing apparatus of the invention according to any one of the first to third aspects, a spinning cover is provided at the intake exhaust outlet of the intake pipe and / or the exhaust inlet of the exhaust pipe. It was set as the open type degassing apparatus of the structure comprised.

By setting it as the above-mentioned structure, it is possible to further improve the removal function of dissolved oxygen, free carbon, and residual chlorine of an open type degassing apparatus, and to improve the corrosion prevention effect of the copper pipe or copper alloy pipe of a circulation hot water supply system.

1 is a diagram illustrating an example of a system diagram of a circulation hot water supply system.
2 is a schematic longitudinal cross-sectional view showing an embodiment of the open degassing apparatus of the present invention.
3 is a perspective view for explaining an arrangement position of an intake exhaust port and an exhaust inlet port.

1 shows an example of a circulating hot water supply system equipped with an open degassing apparatus according to the present invention, and includes a boiler 8, a hermetic storage tank 1, a supply pipe 2, a return pipe 3, and an expansion tank 4 ), Circulation pumps 6 and 9, a plurality of hot water supply tanks 5, and an elevated water tank 7, and the hot water heated in the boiler 8 is once stored in the sealed storage tank 1, and then a supply pipe ( The hot water is heated to each hot water supply 5 through 2), and the remaining hot water is refluxed in the return pipe 3 to be heated in the boiler 8 again. When hot water is consumed, an amount of water corresponding to the consumption amount is to be supplied from the high price bath 7.

The open type degassing apparatus according to the present invention can be provided in the supply pipe 2 and / or the return pipe 3. For example, as shown in FIG. 1, it is installed in the supply pipe | tube near the sealed water storage tank 1 (installation position A). In the circulation hot water supply system, it may be provided above the hot water supply 5 instead of the lower side like the installation position A (installation position B). It may also be provided in the return pipe as in the installation position C.

Next, the open type degassing apparatus 10 which concerns on this invention is demonstrated based on FIG.

The open type degassing apparatus 10 which concerns on this invention supplies the water supply supplied from the outside of the tank 11 and the open type degassing apparatus 10 provided with the water storage part 12 below and the air stagnation part 13 above. The spray nozzle which sprays the water supply pipe 14 for introduce | transducing into the air retention part 13 in the tank 11, and the water supply attached to the front-end | tip part of the water supply pipe 14 in the sprayed state to the air retention part 13, and is sprayed. (15), a drain pipe (17) for discharging the treated water collected in the reservoir (12) in the tank (11) to the outside of the open type degassing apparatus (10), and the tank (from the atmosphere outside the tank (11). Intake pipe 18 for introducing air into air stagnation part 11 in 11 and exhaust pipe 21 for discharging air from air stagnation part 13 in tank 11 into the atmosphere outside tank 11. ). In addition, P is a pump for sending processed water, and V is a drain valve for controlling the water level h of the reservoir 12.

And regarding the arrangement | positioning of the intake exhaust port 19 which is the front end of the air retention part 13 side of the intake pipe 18, and the exhaust inlet 22 which is the front end of the air retention part 13 side of the exhaust pipe 21, It is arrange | positioned so that the distance from the inlet 22 may become the maximum in the space of the air retention part 13.

Herein, the distance between the intake and exhaust outlets 19 and the exhaust inlet 22 is the maximum in the space of the air stagnation part 13, and the relative distance between the intake and exhaust outlets 19 and the exhaust inlet 22 is described. It means that is arranged so as to be the maximum in the space of the air stagnation part (13).

For example, when the shape of the air stagnation part 13 is a rectangular parallelepiped shape, the intake exhaust port 19 is located in the vicinity of either side X of a pair of opposing sides X and X of which the distance shown in FIG. 3 is maximum. ), And the exhaust inlet 22 may be arranged near the other side X, and in the same manner, either one of the pair of opposing sides Y and Y in which the distance shown in FIG. 3 is maximized. The intake exhaust port 19 may be arranged near the side Y, and the exhaust inlet 22 may be arranged near the other side Y.

By arranging the intake and exhaust outlets 19 and the exhaust inlet 22 in this way, the effect of removing dissolved oxygen, free carbon, and residual chlorine from the water supply flowing through the circulation hot water supply system as described later is greatly improved.

Next, the operation method of the open type degassing apparatus 10 of this invention is demonstrated. The feed water containing dissolved air, free carbon, residual chlorine and heated in the closed bottom water tank 1 is sent from the water supply pipe 14 into the tank 11. A spray nozzle 15 is provided at the tip end of the water supply pipe 14, and the spray nozzle 15 is preferably sprayed extensively to the air stagnation part 13 in the tank 11 with water supply as fine as possible. . In order to spray water to the air stagnation part 13 extensively, it is preferable to spray water supply upwards. In the spray nozzle 15, the place which sprays water supply may be one place or multiple places. The sprayed water is discharged to the air stagnation part 13 in the tank 11 in the form of fine particles, but since it is heated to a temperature of about 60 ° C., it is easily vaporized (water vapor) and dissolved air contained in the water supply, Free carbon, residual chlorine is separated.

Water vapor separated from the dissolved air, free carbon, and residual chlorine is re-liquefied in the tank 11 and becomes water droplets and falls to the reservoir 12 in the tank 11, and the water supply of the reservoir 12 is drained. ) Is discharged out of the tank and fed to the supply line. Dissolved air, free carbon, and residual chlorine separated in the air stagnation part 13 in the tank 11 together with the air in the air stagnation part 13 discharge the exhaust pipe 21 at the exhaust inlet 22 in the tank 11. Through the exhaust outlet 23 is discharged out of the tank. The air discharge at the exhaust inlet 22 is promoted by the air being pushed into the air stagnation part 13 from the intake exhaust pipe 19. If the intake pipe 18 is clogged or air is not pushed in from the intake exhaust pipe 19 to the air retention section 13 without the intake pipe 18, the exhaust outlet 23 of the exhaust pipe 21 The amount of free carbon and residual chlorine released into the air stagnant portion gradually increases, and the concentration gradually increases, and redissolved in the water supply of the reservoir, so that the free carbon or residual chlorine is not sufficiently reduced.

In the open type degassing apparatus of the present invention, the intake pipe 18 extends from the vicinity of the lower surface of the tank 11 to the upper side through the inside of the reservoir 12. Since the water supply of the water storage part 12 is heated to the temperature of about 60 degreeC, the intake pipe 18 through the inside of the water storage part 12 is heated by the heated water supply, and stays in the intake pipe 18 further. To heat the air. The heated air rises in the intake pipe 18, is pushed into the tank 11 from the intake outlet 19, and is taken in through the intake pipe 19 through the intake pipe 20 at the intake inlet 20 which passes outside the tank 11. Create a flow of air to the furnace. The intake pipe 18 is not limited to one, but can also be provided in plurality. The exhaust inlet 22 is preferably located above the intake outlet 19, more preferably on the upper surface of the tank 11, and by such arrangement, the exhaust inlet 22 is smooth from the intake outlet 19 to the exhaust inlet 22 of the intake pipe. It is possible to create a flow of air.

As described above, in order to create a smooth flow of air from the intake outlet 19 of the intake pipe to the exhaust inlet 22, a blower fan 24 is further provided near the intake inlet 20 of the intake pipe 18. It is also good. By doing so, the air flow from the intake exhaust port 19 of the intake pipe to the exhaust inlet 22 becomes smoother, and the function of the open degassing apparatus can be further improved.

In addition, in order to prevent water from filling in the intake pipe 18 and / or the exhaust pipe 21 and deteriorating the flow of air from the intake outlet 19 of the intake pipe to the exhaust inlet 22, the intake pipe 18 is prevented. It is also possible to provide a spin cover 25 at the intake and exhaust ports 19 and / or the exhaust inlet 22 of the exhaust pipe 21. By doing so, it becomes possible to prevent the functional deterioration of the open type degassing apparatus in advance.

Although it does not specifically limit as a dimension of the open type degassing apparatus installed in a general circulation hot water supply system, In the case of making a tank into a rectangular parallelepiped shape, the bottom area (D) in FIG. 2 is 100,000-320,000 mm <2> (200-400 mm x 500-) 800 mm rectangular shape), and the height H is preferably 500 to 1000 mm.

During operation of the circulating hot water supply system, the water level h of the reservoir is set to 200 to 500 mm (approximately 25 to 60% of the height H), and the amount of air discharged from the exhaust port (air indentation at the intake outlet) (V2) is approximately 1.5 to 13 m3 / h, and the amount of circulation of the water supply to the water supply pipe in a closed water reservoir (equivalent to the amount of water discharged from the supply pipe to the supply pipe and / or the return pipe) (V1) is approximately 30 to 50 It is operated at l / min. It is preferable that ratio (V2 / V1) of air discharge | release amount V2 and the circulation amount V1 of water supply is 0.5-6.0. If it is less than 0.5, the amount of water to be treated with respect to the amount of discharged air is increased, and the removal rate of dissolved air or the like is not sufficient. If it exceeds 6.0, the amount of exhaust air increases, and together with the discharge of dissolved air, the outflow of water vapor to the outside of the tank also increases, resulting in a loss of circulating water. More preferably, the range of V2 / V1 is 1.0 to 5.0. In addition, although the tank 11 shown in FIG. 2 was assumed to be a rectangular parallelepiped shape, the shape is not limited to this, For example, a cylindrical shape may be sufficient.

Example

Hereinafter, the Example of this invention is described and the effect is demonstrated. In addition, in this Example, the Example of this invention shows one Embodiment of this invention, This invention is not limited to this.

Example 1

In Fig. 2, an experiment was conducted using an open degassing apparatus having the following shape and dimensions, and it was confirmed how much dissolved air, free carbon, and residual chlorine in the feed water could be separated and removed.

Dimensional shape of the open type degassing device: rectangular parallelepiped tank with a bottom surface of 300mm × 600mm and a height H of 800mm

Intake port 22: copper pipe having a cross section of about 564 mm2

Intake pipe 18: A copper tube having an outer diameter of 28.58 mm, a thickness of 0.89 mm, and an inner end area of 564 mm 2.

Further, the intake air outlet 19 is arranged near the side X1 (upper corner of the reservoir in the lower left of FIG. 2), and the exhaust inlet 22 is arranged near the side X2 (the upper right corner of FIG. 2). It was.

The water level h of the reservoir was maintained at about 400 mm, the water supply amount (= drainage amount) V1 was controlled to 2.4 m 3 / h and the temperature of the water supply to 55 to 65 ° C. At this time, the air discharge amount V2 at the exhaust port was substantially constant within the range of 2.0 to 2.2 m 3 / h. The amount of air flowing through the intake pipe was also the same. (V2 / V1) is approximately 0.8 to 0.9.

As an indicator of dissolved air, dissolved oxygen concentration, free carbon song, and residual chlorine concentration were monitored for 24 hours in the water supply pipe (14 in FIG. 2) and the drain pipe (17 in FIG. 2) of the open degassing apparatus, respectively, to confirm the situation of separation and removal. .

Comparative Example 1

As a comparative example, in the same apparatus as in the first embodiment, the intake air outlet 18 is arranged near the side Y1 (upper corner of the reservoir at the lower right of FIG. 2), and the exhaust inlet 22 is arranged on the side X2 (FIG. The same evaluation was performed using the apparatus arrange | positioned in the vicinity of the upper right corner of 2.

Table 1 shows the average values of dissolved oxygen concentration, free carbon concentration and residual chlorine concentration after monitoring for 24 hours. As shown in Table 1, in Example 1 according to the present invention, it was confirmed that the removal rate of the dissolved oxygen, free carbon, and residual chlorine can be significantly improved with respect to Comparative Example 1.

Example 1 Comparative Example 1 Concentration in water supply
(Mg / l) Degassing Water
Concentration (mg / l) Concentration in water supply
(Mg / l) Degassing Water
Concentration (mg / l) Dissolved oxygen 10 5 10 7 Glass carbon 24 2 24 5 Residual chlorine 0.5 0.02 0.5 0.05

1: Hermetically sealed water tank
2: supply pipe
3: return tube
4: expansion tank
5: hot water supply
6: circulation pump
7: expensive tank
8: boiler
9: circulation pump
10: open degassing apparatus of the present invention
11: tank
12: reservoir
13: air stagnation
14: water supply pipe
15: spray nozzle
16: water spouted from the spray nozzle in a spray state
17: drain pipe
18: intake pipe
19: intake exhaust
20: intake inlet
21: exhaust pipe
22: exhaust inlet
23: exhaust outlet
24: blower fan
25: spinning cover
P: circulation pump
V: Valve
A: Installation portion of the open type degassing apparatus of the present invention
B: installation portion of the open type degassing apparatus of the present invention
C: mounting portion of the open type degassing apparatus of the present invention

Claims (4)

In the open type degassing apparatus for removing dissolved oxygen, free carbon, and residual chlorine from feed water circulating in a circulation hot water supply system,
A tank having a water storage section below and an air stagnation section above;
A water supply pipe for introducing water supplied from the outside of the open degassing apparatus into the air stagnation portion in the tank;
A spray nozzle which sprays the water supplied to the air stabilization part, which is installed and supplied to the tip of the water supply pipe;
A drain pipe for discharging the water supply collected and treated in the reservoir in the tank to the outside of the open degassing apparatus;
An intake pipe for introducing air from the atmosphere outside the tank to the air stagnation portion in the tank;
An exhaust pipe for discharging air in the air stagnation part in the tank into the atmosphere outside the tank;
The distance between the intake and exhaust ports of the intake pipe and the exhaust inlet of the exhaust pipe is maximized in the air stagnation space;
The spray nozzle ejects the water supply upwards of the tank,
The intake pipe extends through the water reservoir from above the lower surface of the tank upwards,
The air stabilization portion has a rectangular parallelepiped shape, and the air intake and exhaust ports of the intake pipe are disposed near one side of a pair of mutually opposite sides having a maximum distance, and the exhaust inlet of the exhaust pipe is disposed near the other side. An open degassing apparatus characterized in that. delete The method of claim 1,
An open type degassing apparatus characterized by arranging a blowing fan in the vicinity of an intake inlet of the intake pipe. The method according to claim 1 or 3,
An open degassing apparatus characterized by comprising a spinning cover at the intake exhaust port of the intake pipe and / or the exhaust inlet of the exhaust pipe.

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