JPS5928231Y2 - acid cooler - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cooler for sulfuric acid, nitric acid, phosphoric acid, etc.

An anode corrosion protection method was used in which a shell with a heat exchange chamber inside was connected to the anode side, a cathode rod was inserted into the heat exchange chamber, and a predetermined acidic liquid was supplied into the heat exchange chamber to cool the acidic liquid. In acid coolers, an oxide film is formed on the inner peripheral surface of the shell to prevent the shell from being corroded by the acidic liquid being cooled.

Conventionally, from the viewpoint of corrosion resistance, the above-mentioned cathode rod is generally made of steroid C (chemical components Ni 58 , Mo 17
~19, Cr11-14, Mn0.2.

This is because the rod material made of Sil, Fe 6-9%) is used...Steroy C has a very low electrical conductivity comparable to that of nichrome wire.

On the other hand, since this cathode rod is long, the voltage drop is large.

Therefore, there is a problem that it is difficult to maintain the potential of the oxide film.

Therefore, the present invention provides an acid cooler that solves these problems.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

This embodiment relates to a shell-and-tube type cooler for cooling hot concentrated acid.

1 is a stainless steel shell connected to the anode side,
Partition plates 2 and 3 are provided near both ends of the interior to form a heat exchange chamber 4 for medium heat, and a communication chamber 5 is formed between one of the partition plates 2 and one end wall 1a of the shell 1. It is.

Further, a partition wall 6 is provided between the other partition plate 3 and the other end wall 1b of the shell 1 to form a cooling water supply chamber 7 and a cooling water discharge chamber 8.

9 is a cooling water supply pipe connected to the cooling water supply chamber 7; 1
0 is a cooling water discharge pipe connected to the cooling water discharge chamber 8, 1
1 is a large number of heat exchange tubes that pass through the heat exchange chamber 4 and communicate the cooling water supply chamber 7 and the cooling water discharge chamber 8 with the communication chamber 5; 13 is a sulfuric acid supply pipe; 14 is a sulfuric acid discharge pipe It is.

Reference numeral 15 denotes a cathode rod inserted into the heat exchange chamber 4 through one end wall 1a and one partition plate 2 of the shell 1, and includes an outer cylinder 16 made of No. It is made up of a bar material 17 with high electrical conductivity such as copper, copper alloy, aluminum, etc. inserted into the holder.

Reference numeral 18 denotes a tip camp whose small diameter portion is inserted into the distal end of the outer cylinder 16 and welded to the outer cylinder 16, and numeral 19 denotes a tip camp whose small diameter portion is inserted into the proximal end of the outer cylinder 16 and is welded to the rod 1.
7 is a proximal end cap with a bolt 20 secured and a large diameter portion welded to the proximal end of the outer cylinder 16; 21 is a bend formed in the cap 19; a bolt screwed into TL; 22 is a bolt 2;
This is a nut that is screwed into the bolt 20 and presses the end of the electric wire 23 that fits into the bolt 20 to the base end camp 19.

24 are screw holes 25 formed in the outer cylinder 16 at appropriate intervals.
The male torsion that is screwed into the rod 17 and presses against the bar 17 to bring the rod 17 into contact with the outer cylinder 16, 26 is the above-mentioned torsion, Jl,
25 to seal each screw hole 25.

Note that the cross-sectional shape of the bar 17 is circular as shown in FIG.
Various shapes are possible, such as a crescent shape as shown in FIG. 4 and a rectangle as shown in FIG.

In the above configuration, hot concentrated sulfuric acid (90 to 98% H2SO4
, 50 to 130° C.) is supplied into the heat exchange chamber 4 through the supply pipe 13, and cooling water is supplied into each tube 11 through the supply pipe 9 button and the supply chamber 7.

As a result, the hot concentrated sulfuric acid is cooled by the cooling water, and the cooled concentrated sulfuric acid is discharged to a predetermined location via the discharge pipe 14.

The cooling droplets are also discharged via the discharge chamber 8 and the discharge pipe 10.

On the other hand, when a current is passed between the shell 1 and the cathode rod 15, an oxide film is formed on the inner peripheral surface of the shell 1 in the heat exchange chamber 4.
This prevents the shell 1 from being corroded by the hot concentrated sulfuric acid that is being cooled.

As described above, according to the acid cooler of the present invention, the cathode rod is composed of a corrosion-resistant outer cylinder and a rod with high electrical conductivity inserted into the outer cylinder. Not only is the rod less likely to be corroded by the acidic liquid being cooled, but the voltage drop is small due to the action of the rod, even though the cathode rod is long.

Therefore, it is possible to reliably maintain the potential of the oxide film formed on the inner peripheral surface of the shell.

Furthermore, the cost is low because the amount of expensive outer cylinders can be reduced to about half compared to the conventional method.

Furthermore, since a means for bringing the bar into contact with the outer cylinder is provided,
The rod and the outer cylinder are electrically connected reliably.

[Brief explanation of drawings]

The figure shows one embodiment of the present invention, and FIG. 1 shows a schematic explanatory diagram,
FIG. 2 is a longitudinal cross-sectional view of the main part, and FIGS. 3 to 5 are cross-sectional views of the main part showing modified examples of the bar. DESCRIPTION OF SYMBOLS 1... Shell, 4... Heat exchange chamber, 7... Cooling water supply chamber, 8... Cooling water discharge chamber, 15... Cathode rod, 16
... Outer cylinder, 17 ... Bar material, 24 ... Male thread (means for connecting).

Claims (1)

[Scope of utility model registration request] An anode corrosion protection method was used in which a shell with a heat exchange chamber inside was connected to the anode side, a cathode rod was inserted into the heat exchange chamber, and a predetermined acidic liquid was supplied into the heat exchange chamber to cool the acidic liquid. In the acid cooler, the cathode rod is provided with a corrosion-resistant outer cylinder;
1. An acid cooler comprising a rod having high electrical conductivity inserted into the outer cylinder, and comprising means for bringing the rod into contact with the outer cylinder.