JP3267377B2 - Drain water neutralizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain water neutralizer used for an exhaust heat recovery type heat exchanger such as a condensing boiler.

[0002]

2. Description of the Related Art Generally, drain water generated in a heat recovery type heat exchanger is strongly acidic, and if drained as it is, there is a risk of eroding concrete grooves. Release into the groove. However, this type of neutralizer normally neutralizes the metal neutralizer made of an alkaline earth metal such as magnesium as a lattice block through drain water, but oxidation products and impurities adhere to the neutralizer. This has the disadvantage that the performance tends to deteriorate and the life is generally short.

[0003]

Accordingly, a method of collecting drain water in a tank containing a metal neutralizing material, inverting the neutralization tank every time a certain amount of water is collected, and draining the collected drain water. Can be considered. When the water is drained at a time as described above, the products and impurities attached to the upper surface of the neutralizing material are washed away, so that there is an advantage that the neutralizing performance is maintained for a long time. In addition to the above, there is a problem that the cost of the treated water increases, and the PH value of the treated water fluctuates because the time required to accumulate a predetermined amount fluctuates due to fluctuations in temperature, operating conditions, and the like. The present invention solves these problems and, by using a reversing neutralization tank, prevents the adhesion of impurities and the like to the metal neutralizing material, does not require any external power source or control equipment, and It is an object of the present invention to provide a drain water neutralizer capable of keeping the PH value after treatment within a specified range.

[0004]

As shown in FIG. 1, the drain water neutralizer according to the present invention tilts when a certain amount of water accumulates, releases the accumulated water, and returns to the first tank, ie, A.
A tank, a second tank fixed below the tank A, receiving water discharged from the tank A, and discharging from the outlet D at the bottom, that is, a tank B; A third tank C, which tilts when the same amount of water as the tank A receives water flowing down from the tank A and releases the collected water, that is, a tank C,
The metal neutralizing material E is installed in the tank, and the lower end of the arm F protruding downward from the tank A engages with the locking plate G protruding from the tank C to tilt the tank A. Up to this, the tilt of the C tank is locked.

[0005]

[Action] It takes a certain amount of time to neutralize a certain amount of drain water.
The drain water in tank C is treated until it is sufficiently alkaline, so that the amount of drain water generated fluctuates. A part of the next drain water flowing down from the outlet D is used to return to neutral.

[0006]

1 and 2 show an embodiment of a neutralizer according to the present invention, in which A to C tanks, an arm F provided in each tank,
The outflow port D, the locking plate G, and each rotating shaft K are all made of plastic, and the tanks A and C are supported on the case L by the rotating shaft K, and tilt when a certain amount of drain water is accumulated. Then, after discharging the accumulated drain water, it returns. The tank B is fixed to the case L below the tank A, and receives the drain water discharged from the tank A,
It is discharged from the outlet D at the bottom as it is. In the C tank, a metal neutralizing material E constituted by connecting a plurality of magnesium plates in a lattice shape is mounted, and the lower end of an arm F protruding downward from the A tank and the C tank. The engagement of the protruding locking plate G locks the tilting of the tank C until the tank A tilts. Further, the treated water discharged from the tank C is received by the drainage receiving tank I and drained from the drainage pipe J.

In the following operation, numerical values in parentheses are examples for simplifying the description. Now, in FIG.
The tank contains the last minute (160 cc) of drain water,
It is assumed that the tilting of the tank C due to the load is prevented by the engagement between the locking plate G and the arm F, and the tank B is empty. In this state, the drain water flows down from the drain pipe H to the tank A (for example, over 15 minutes), and a certain amount (200
cc), first, the tank A tilts, and the drain water accumulated in the tank A flows into the tank B in about 1 second. At the same time, the drain water flows down from the outlet D of the tank B to the tank C. At first, the flow of the entire amount is completed in a certain time (5 seconds) determined by the diameter of the outlet D. The tank C tilts slightly later than the tank A, and releases the retained treated water in about 1 second. FIG. 2 shows the state at this time. When the tank C returns, since the tank A has already returned, the locking plate G comes into contact with the arm F, but passes almost without resistance due to the principle of leverage. Approximately 4 seconds after the tank C returned, the drain water (16
Although it tries to tilt again with a load of 0 cc), it is locked to the arm F in a state where it is slightly tilted to the left from FIG. 1, and in that state, the neutralization treatment of the drain water in the C tank is performed.

[0008] In the above example, it took 15 minutes to accumulate 200 cc in the A tank, but the operating time fluctuates, so that the next required time is unknown. In particular, it takes a long time to reach PH = 5, so if the processing time is insufficient,
It will be drained with strong acidity. Therefore, the capacity of each tank, the surface area of the neutralizing material, The diameter of the outlet is determined, and the strongly acidic drain water flowing down from the tank B while the tank C is tilted (in this case, 4
0 cc) so that this is in the acidic direction (eg PH = 5.
It is re-neutralized to 5). In this way, since the PH value saturates when the required time is longer, it is possible to design so as to return to the allowable value (for example, PH = 8.5) even if it is longer. Actually, the required time is about 30 minutes even under the operating conditions where the generation of condensed water is the least, and therefore, when the required time is 10 to 30 minutes, PH =
It is set to be 5.5 to 8.5. Of course, it is also possible to make the volume of each tank and the surface area of the neutralizing material sufficiently large to completely neutralize the alkali and then re-neutralize it to neutrality (PH = 7). Since there is an allowable range (P
H = 5 to 9) may be set appropriately.

[0009]

The drain water neutralizer according to the present invention stores a fixed amount of drain water and treats the same. Therefore, the required amount of the metal neutralizing material is smaller than that in which the drain water is continuously passed and treated. By inverting the neutralization tank and draining it at once, impurities and products adhering to the neutralizing material can be washed out, so that the neutralizing performance can be maintained for a long time, and the drain water Even if the generation amount fluctuates, PH
The neutralization treatment can be performed so that the value always falls within the specified range, and there is an advantage that no external power source or control equipment is required.

[Brief description of the drawings]

FIG. 1 is a side view of the inside of a case of an embodiment of a drain water neutralizer according to the present invention.

FIG. 2 is a side view in the case showing the operation of the above.

[Explanation of symbols]

 A First tank or A tank B Second tank or B tank C Third tank or C tank D Outlet E Metal neutralizer F Arm G Locking plate H Drain pipe I Drain receiving tank J Drain pipe K times Active axis L case

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-47-33763 (JP, A) JP-A-61-76820 (JP, A) Real opening Sho-60-155997 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) C02F 1 / 66,1 / 00 B01J 4/00 F24H 9/00

Claims (1)

(57) [Claims] 1. A first tank that tilts when a certain amount of water accumulates, releases the accumulated water, and returns, a water tank fixed below the first tank and discharged from the first tank. Receiving the water flowing down from the second tank and the second tank, which is provided below the second tank and receiving the water flowing down from the second tank, and accumulates the same amount of water as the first tank. And a third tank that returns by releasing accumulated water, with a metal neutralizing material installed in the third tank, and a lower end of an arm protruding downward from the first tank. Wherein the tilting of the third tank is locked until the first tank tilts by engagement with a locking plate protruding from the third tank.