JPH01300196A - Cleaning of titanium made condenser cooling tube - Google Patents

Abstract

PURPOSE:To remove adhered substance containing calcium carbonate, which is adhered to the inner surface of cooling tubes by a method wherein acid is poured into cooling water in the condenser cooling tubes made of titanium and the acid is circulated. CONSTITUTION:A condenser inlet port valve 7 and a condenser outlet port valve 8 are closed under a condition that water introducing pipes 6, a sea water inlet water chamber 4, titanium tubes 2, a sea water outlet port water chamber 5 are filled with sea water and a sea water circulating pump 10 in a hydrochloric acid pouring system 9 is operated to circulate sea water. The hydrochloric acid is poured into the sea water through a pouring seat 11 provided at the downstream side of the pump 10. The pouring amount of the hydrochloric acid is regulated by a PH-meter 13 provided at the downstream side of the pouring seat 11 so as to obtain the PH value of the degree of 1-2. The sea water is acidified by the hydrochloric acid, poured into the sea water, whereby marine organism, such as acorn shells and the like which are adhered to the inner surface of the water chambers 4, 5 and titanium cooling pipes 2, may be removed by dissolution.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a condenser, and in particular to a method for dissolving marine organisms etc. attached to the cooling pipe of a condenser made of titanium. This article relates to a method for removing marine organisms from a condenser.

(Prior art) Aluminum brass pipes have traditionally been widely used as cooling pipes in condensers of power plants, and in order to prevent corrosion from seawater, an iron coating is formed on the inner surface of the cooling pipes. ing. To form an iron film, there are a method of chemically injecting ferrous sulfate and an iron electrolysis method. However, even if an iron coating is formed, it is impossible to completely prevent corrosion of aluminum brass by seawater, and iron injection is not preferable from the viewpoint of environmental protection.

Therefore, in recent years, cooling pipes made of titanium, which has perfect corrosion resistance in seawater, have been used instead of aluminum brass pipes.

(Problem to be solved by the invention) Titanium tubes, which have come to be used in place of conventional aluminum brass tubes, have excellent corrosion resistance, but
Compared to aluminum brass pipes, they have the disadvantage that marine organisms are more likely to adhere to them. Among the marine organisms that adhere to the inner surface of pipes,
Fujibo, in particular, sticks to the inner surface of cooling pipes and causes many problems, such as a reduction in the cooling area due to cooling pipe blockages and problems during internal inspection of the cooling pipes. However, a complete removal effect was not obtained, and in the end, when the condenser was opened and inspected, jet cleaning or a method of forcibly removing the fujibubble with a stick removal rod was used. There is.

However, these removal methods generate excessive pressure and scratches on the titanium tube, and damage to the cooling tube caused by this has become a problem.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to remove marine organisms such as Fujitbo that have firmly adhered to the inner surface of a titanium cooling pipe without damaging the cooling pipe.

[Structure of the invention]

(Means for Solving the Problems) The present invention injects acid into cooling water inside a titanium condenser cooling pipe, circulates the acid, and removes deposits including calcium carbonate that have adhered to the inner surface of the cooling pipe. This is a method for cleaning titanium condenser cooling pipes characterized by dissolving and removing them.

(Function) The acid injected into the cooling water is a carbon calcium (CaCO3
) and decomposes calcium carbonate while generating carbon dioxide (Co, ).For example, when hydrochloric acid is used as the acid, the following reaction occurs.

CaC0, + 2HCQ-+CaCQ, + tl□O
The reaction rate between 10CO2 hydrochloric acid and calcium carbonate is extremely fast, and it is possible to easily dissolve and remove Fujibuki etc. attached to the inner wall of the cooling pipe.

(Example) Hereinafter, in 6 drawings for explaining an example of the present invention using drawings, a condenser 20 includes a large number of titanium tubes 2 arranged inside a main body shell 1 and a titanium tube supporting these. It is composed of a plate 3, a seawater inlet chamber 4 defined by the titanium tube plate 3, a seawater outlet chamber 5, and a water pipe 6 for introducing seawater into the ice chamber. A hydrochloric acid injection system 9 for removing marine organisms is provided between the condenser inlet valve 7 and the condenser outlet valve 8 of the water conduit 6, and a seawater circulation pump 10. A hydrochloric acid injection amount 11 and a pH meter 12.13 are installed. In the above configuration, the piping of the hydrochloric acid injection system 9 includes the water chambers 4 and 5 and the water conduit 6.
It is desirable to provide a rubber lining or a tar-epoxy coating, such as that applied to , to provide acid corrosion resistance.

In the above configuration, the condenser inlet valve 7 and the condenser outlet valve 8 are closed with the water conduit 6, the seawater inlet water chamber 4, the titanium tube 2, and the seawater outlet water chamber 5 filled with seawater, and the hydrochloric acid injection system is The seawater circulation pump 10 No. 9 is operated to circulate seawater. Hydrochloric acid is injected into seawater from an injection volume 11 provided downstream of the pump 10. The amount of hydrochloric acid to be injected is adjusted to be approximately P) 11 to 2 using a PH meter 13 installed downstream of the amount 11 to be injected.

The hydrochloric acid injected into the seawater makes the seawater acidic and dissolves and removes marine organisms such as Fujibo, which have adhered to the water chambers 4 and 5 and the inner surface of the titanium cooling pipe 2.

The degree of removal of marine creatures such as Fujibo can be monitored by continuously measuring the pH of seawater using a pH meter 12 installed upstream of the Wi ring pump 11. In other words, while Fujibushi remains in the seawater system, hydrochloric acid is consumed due to the dissolution of calcium carbonate, so the circulation pump 1
Openings can be seen at pH values around 0. When marine organisms such as Fujitbo are completely dissolved, the pH value becomes almost constant. At that point it is considered complete and the condenser inlet valve 8
, open the outlet valve 9 and discharge the seawater to the outside of the system.6 Since the hydrochloric acid used in the examples described above is a highly corrosive acid, the condenser itself, including the condenser itself, is Although there are concerns about corrosion of parts, all seawater systems are rubber-lined and coated with tar-epoxy, so there is no problem with corrosion from hydrochloric acid.

〔Effect of the invention〕

As described above, the present invention is capable of reliably removing marine organisms such as Fujibo by injecting acid into the conduit pipe that leads seawater to the condenser. The huge amount of time and cost required for conventional jet cleaning and other physical removal methods that were used to remove barnacles attached to the cooling pipes can be reduced, and the removal can be done without damaging the cooling pipes. can be expected to have a significant effect on safety.

[Brief explanation of the drawing]

The drawing shows a titanium condenser showing one embodiment of the present invention. 1... Condenser body shell 2... Titanium cooling pipe 3...
・Titanium tube plate 4...Seawater inlet water chamber 5...Seawater outlet water chamber 6...Water pipe 7...Condenser inlet valve
8... Condenser outlet valve 9... Hydrochloric acid injection system 10.
... Circulation pump 11 ... Hydrochloric acid injection seat 12.13
...PH total 14...Gate valve 20...Condenser agent Patent attorney Noriyuki Chika Ken Yudo Daishimaru Ken

Claims (1)

[Claims] Inject acid into the cooling water inside the titanium condenser cooling pipe,
A method for cleaning a titanium condenser cooling pipe characterized by circulating this acid to dissolve and remove deposits containing calcium carbonate adhering to the inner surface of the cooling pipe.