JP2002192165A - Dew condensation water neutralizing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dew condensation water neutralizing apparatus, which can prevent metal ions dissolved in dew condensation water and living organisms, such as algae and bacteria, from closing gaps in a neutralizing agent, thereby sufficiently continuing a good neutralization reaction over the whole of the neutralizing agent. SOLUTION: This neutralizing apparatus is an apparatus for neutralizing acidic dew condensation water generated in a heat exchanger. A coagulating separation part 30 for flocculating definite substances and living organisms present in the dew condensation water to be separated and removed, is installed on the upstream side of a neutralization part 40 for neutralizing the dew condensation water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dew water neutralizing device for neutralizing acidic dew water generated in a heat exchanger.

[0002]

2. Description of the Related Art Condensed water generated from a heat exchanger or the like of a combustor such as a latent heat recovery type combustion device has a strong acidity, and thus it is necessary to drain the water after a neutralization treatment. For this reason, conventionally, the generated strongly acidic dew water is guided to a neutralization tank containing a neutralizing agent to be neutralized, and then drained.

[0003]

However, dew condensation water contains
Metal ions such as iron ions due to the material of the dew condensation part and the dew water passage melt into the neutralization tank through the dew condensation part and the dew water passage that leads the dew water from there, and this iron ion etc. Metal ions react with the neutralizing agent in the neutralizing tank to become a reaction product and clog the gap between the neutralizing agents,
As a result, there is a problem that the passage of the dew water is blocked. In addition, depending on the conditions such as the place where the dew condensation occurs and the location of the dew condensation passage, organisms (including dead bodies) such as algae and bacteria are generated in the dew condensation water, and these organisms (including dead bodies) are generated in the neutralization tank. There were problems such as clogging the gaps of the washes and blocking passages. If the passage in the neutralization tank is closed, the neutralization process will not be performed properly even though the neutralizing agent still has a neutralizing function. In particular, when such a blockage occurs near the entrance in the neutralization tank, short-circuiting occurs only in the upper part of the neutralization tank without passing through each gap of the neutralizing agent packed in the neutralization tank. In some situations, the neutralizing tank must be replaced even though the function of the neutralizing agent has not been fully used.

Accordingly, the present invention solves the above-mentioned drawbacks of the conventional condensed water neutralizer, and removes metal ions, algae, etc. dissolved in the condensed water.
Provided is a dew condensation water neutralization device capable of preventing organisms such as bacteria from closing the gaps of the neutralizing agent and allowing a satisfactory neutralization reaction to be sufficiently continuously performed in the entire neutralizing agent. As an issue.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a dew condensation water neutralizing device according to the present invention is a neutralization device for neutralizing acidic dew water generated in a heat exchanger. The first feature is that an aggregating / separating unit for aggregating and removing certain substances and living organisms existing in the water is provided before the neutralizing unit for neutralizing the dew water. Further, in addition to the first feature, the dew condensation water neutralizing device of the present invention further includes a neutralization tank for introducing dew water, and only a flocculant is disposed without disposing a neutralizing agent in an upstream region in the neutralization tank. A coagulation separation section with
A second feature is that a neutralizing section in which a neutralizing agent is provided is provided in a region downstream of the aggregation separation section. Further, in addition to the first or second feature, the dew condensation water neutralizing device of the present invention has a flocculating agent effective for flocculating and separating a positively charged material and a negatively charged material in the flocculating / separating section. A third feature is that at least one or both of the flocculants effective for the flocculation and separation of the substance are used. Further, in the dew condensation water neutralizing device of the present invention, in addition to the first or second feature, the coagulation / separation unit does not use a coagulant but applies a certain substance or the like present in the dew condensation water by applying a voltage. A fourth feature is that the living organisms are aggregated and separated and removed.

[0006] In the above description, the certain substances and organisms existing in the dew water are all ions, charged colloids, and other charged substances present in the dew water that are relatively easily aggregated and settled. And a substance which easily reacts with the neutralizing agent and precipitates by flowing at least into the neutralizing section.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a neutralization tank, which is a main part of a dew condensation water neutralization apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of the neutralization tank.

A neutralization tank 10, which is a main part of a dew condensation water neutralization device of a combustor such as a latent heat recovery type combustion device, includes a main body 11 and a lid 12.
Consists of The acidic condensed water generated in the heat exchanger passes through the condensed water passage 20 indicated by an arrow, and enters the neutralization tank 1 from the inlet 10a.
While flowing into the main body 11 in a vertical zigzag manner, it flows from one side of the main body 11 to the other, and is discharged from the outlet 10b.

The main body 11 has a plurality of zigzag passage forming partition walls 13, 1 forming a zigzag passage in an internal space.
4 and 15 are provided. Each of the zigzag passage forming partition walls 13, 14, and 15 is provided in the vertical direction, but the upper ends 13 a, 14 a, and 15 a of the partition walls 13, 14 a, and 15 a do not reach the uppermost portion of the main body 11. At the top, there is a space open horizontally. On the other hand, the partition wall 14 for zigzag passage configuration
Is configured to stand upright from the bottom of the main body 11, and the bottom of the inner space of the main body 11 is partitioned at the position of the partition wall 14 without flowing. The height of the partition wall 14 is made lower than the partition plates 13 and 15 on both sides, so that dew condensation water can easily flow along the zigzag passage. In this embodiment, the number of the zigzag passage forming partition walls 13, 14, 15 is three, but if there are more, the above-mentioned partition plates 14 are provided every other one. With respect to the other partition walls 13 and 15, the lower ends 13b and 15b are formed apart from the bottom of the main body 11, and the condensed water flows through the lower ends 1 and 15.
It flows under the 3b and 15b to the next passage.

The zigzag passage forming partition walls 13, 1
Partition wall 13 closest to entrance 10a among 4, 15
Constitutes a guide that guides the dew water entering the main body 11 from the inlet 10a downward along the partition wall 13, and is formed between the partition wall 13 and the side wall to the bottom wall of the main body 11 adjacent thereto. The space to be formed is referred to as a coagulation / separation unit 30.
In this aggregating / separating section 30, without providing the neutralizing agent A,
Only coagulant B is provided. Specifically, the separation wall 1 is provided between the lower end 13 b of the partition wall 13 and the adjacent partition wall 14.
6, a neutralizing agent A is disposed in a region downstream of the separation wall 16 to form a neutralization unit 40, and an upstream region of the separation wall 16 is defined as a coagulation separation unit 30 to separate the two. The separation wall 16 is naturally provided with a passage hole 16a through which the dew condensation water passes. The separation wall 16 may be detachably attached later. A separation wall 17 for the coagulant B is provided at a lower portion of the coagulation / separation unit 30, and the main body 11 below the separation wall 17.
The inner bottom is filled with the flocculant B. The separation wall 17 is removable. Of course, the separation hole 17a
Is provided. The partition wall 13 may be provided with a flow hole 13c communicating with an adjacent passage (neutralizing portion) in the middle thereof.

The neutralizing section 40 is provided in a downstream area of the coagulation / separation section 30. Specifically, it is configured on the back side of the partition wall 13 and downstream of the separation wall 16, but up to just before the treated liquid collecting chamber 50 provided with the outlet 10 b of the neutralization tank 10. The treated liquid collecting chamber 50 is a chamber for temporarily collecting the condensed water after the neutralization treatment, and is provided at the most downstream portion of the neutralization tank 10. The separation wall 18 is also attached to the lower part of the neutralization part 40 so that the neutralizing agent A does not enter below the separation wall 18 to secure the flow of the zigzag passage in the neutralization part 40 of the dew condensation water. ing. In addition, the separation wall 18 is provided with a flow hole 18a for passing dew water.

Examples of the flocculant B include substances such as cations or positively charged colloids such as aluminum sulfate, ferric chloride, and polyaluminum chloride, and organisms (including dead bodies) such as algae and bacteria. Coagulants that can coagulate and settle; substances such as anionic or negatively charged colloids, such as polyacrylamide-based, polyamidine-based, and N-vinylformaldehyde-based cationic polymer flocculants; and algae. And / or a coagulant capable of coagulating and sedimenting organisms (including dead bodies) such as bacteria and bacteria. The coagulant B may be charged periodically in a liquid state. Neutralization tank 10
Dew entering from the inlet 10a of the water, in the agglomeration / separation unit 30, which is the uppermost stream region, is charged with iron ions, other metal ions, colloids, or the like, organisms (including dead bodies), and other substances. The charged object is aggregated by the coagulant B and settled. Therefore, in the dew water that has passed through the aggregating / separating section 30, substances that are easily precipitated by the neutralizing agent A have already been removed, and a large amount of reaction products is prevented from settling. As the neutralizing agent A, for example, granular calcium carbonate can be used.

In the above embodiment, the coagulation / separation unit 30 in which the coagulant B is disposed is provided in the upstream region of the same neutralization tank 10, but only the neutralizer A is provided in the neutralization tank 10. The aggregation / separation unit 30 may be separately provided at a position upstream of the neutralization tank 10. In this case, the condensed water first passes through the separately provided coagulation / separation unit 30, and then enters the neutralization tank 10 to be neutralized. Further, in the dew water neutralization device of the present invention, it is important that the coagulation / separation unit 30 is disposed at a position upstream of the neutralization unit 40. However, it is not always necessary that the neutralization unit 40 be provided in the neutralization tank 10. Absent.

In the above embodiment, the aggregating agent B is used for the aggregating / separating section 30.
By applying a voltage to the dew condensation water flow path of the coagulation / separation unit 30 without using the water, iron ions and other metal ions present in the dew condensation water, and organisms (including dead bodies) such as algae and bacteria
Can be aggregated and settled. The voltage can be applied by providing electrodes on both sides of the flow path of the coagulation / separation unit 30 and applying an appropriately adjusted voltage.

[0015]

According to the present invention, there is provided a neutralizing apparatus for neutralizing acidic dew water generated in a heat exchanger. Therefore, an aggregating / separating unit for aggregating and separating certain substances and organisms present in the dew condensation water is provided upstream of the neutralization unit that neutralizes the dew condensation water. It is possible to prevent dissolved metal ions, algae, bacteria, and other organisms from closing the gaps between the neutralizers, and to ensure that a good neutralization reaction can be performed sufficiently throughout the neutralizer. it can. According to the dew water neutralization device of the second aspect, in addition to the effect of the configuration of the first aspect, a neutralization tank for introducing the dew water is provided, and the neutralization tank is provided in the upstream region in the neutralization tank. Since the aggregating / separating section in which only the aggregating agent is provided without providing the wetting agent is provided, and the neutralizing section in which the neutralizing agent is provided in the downstream region from the aggregating / separating section, the same one neutralization tank is used. As a result, the preliminary removal of the flow path obstruction from the dew condensation water and the neutralization treatment can be performed, so that the space saving and cost reduction effects are large both in terms of equipment and arrangement. According to the dew condensation water neutralizing device of the third aspect, in addition to the effect of the configuration of the first or second aspect, the aggregating / separating section is effective for the aggregating / separating of a positively charged substance. Since at least one or both of the flocculant and the flocculant effective for the flocculation and separation of the negatively charged substance are used, we want to flocculate and remove one or both of the positively charged substance and the negatively charged substance present in the dew water. Aggregation and sedimentation removal are possible depending on the target object. According to the dew condensation water neutralizing device of the fourth aspect, in addition to the effect of the configuration according to the first or second aspect, the coagulation / separation unit performs the dew condensation by applying a voltage without using a coagulant. Because it is configured to coagulate and separate certain substances and organisms present in water, it is possible to electrically coagulate and remove certain substances and organisms present in dew condensation water without using a coagulant. . In this case, it is not necessary to consider the depletion of the flocculant.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a neutralization tank, which is a main part of a dew condensation water neutralization apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of a neutralization tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Neutralization tank 10a Inlet 10b Outlet 11 Main body 12 Lid 13, 14, 15 Partition wall for zigzag passage formation 16, 17, 18 Separation wall 20 Condensation water passage 30 Coagulation separation part 40 Neutralization part 50 Treated liquid collection chamber A Washing agent B Flocculant

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C02F 1/66 540 C02F 1/66 540E 540Z F24H 9/00 F24H 9/00 B (71) Applicant 000221834 Toho Gas Co., Ltd. 19-18, Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi (72) Inventor Hisashi Miyawaki 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo F-term in Noritz Co., Ltd. DB02 DB22 DC07 EA24 EA32 FA02 FA28 4D061 DA08 EA02 EB01 FA11 4D062 BA19 BB05 CA20 DA04 DA05 DA13 DB02 DB22 DC07 EA24 EA32 FA02 FA28

Claims (4)

[Claims] 1. A neutralization device for neutralizing acidic dew water generated in a heat exchanger, wherein the coagulation and separation unit coagulates and separates and removes certain substances and organisms present in the dew water. Is provided upstream of a neutralizing section that neutralizes dew condensation water. 2. A neutralizing tank for introducing dew water is provided, and an aggregating / separating section in which only a flocculant is disposed without disposing a neutralizing agent is provided in an upstream region in the neutralizing tank. 2. The apparatus for neutralizing dew condensation water according to claim 1, further comprising a neutralizing section provided with a neutralizing agent in a downstream region. 3. The aggregating / separating unit uses at least one or both of an aggregating agent effective for aggregating / separating a positively charged material and an aggregating agent effective for aggregating / separating a negatively charged material. 3. The method according to claim 1, wherein
The dew condensation water neutralization device according to 1. 4. The coagulation / separation unit is configured to apply a voltage to coagulate and separate and remove certain substances and organisms present in dew water without using a coagulant. 3. The dew water neutralization device according to 1 or 2.