CN109913877B

CN109913877B - Easy-to-replace cathode protection device for large drum-shaped rotary filter screen

Info

Publication number: CN109913877B
Application number: CN201910220409.7A
Authority: CN
Inventors: 王廷勇; 许实
Original assignee: Sunrui Marine Environment Engineering Co ltd
Current assignee: Sunrui Marine Environment Engineering Co ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2021-01-26
Anticipated expiration: 2039-03-22
Also published as: CN109913877A

Abstract

A large drum-shaped rotary filter screen cathode protection device easy to replace is characterized in that a linear anode assembly is arranged around a drum-shaped rotary filter screen and comprises an ammeter, tubular metal oxide anodes, cables and a sleeve with holes, wherein the ammeter and the tubular metal oxide anodes are mutually connected in series through the cables and are arranged in the sleeve with the holes; the top end and the bottom end of the sleeve with the hole are respectively fixedly connected with surrounding buildings; the position of each tubular metal oxide anode corresponds to the hole on the wall of the sleeve with the hole. The invention has the advantages that: the method has the advantages of simple operation, detachability, online detection and the like. The ammeter that this equipment was established ties can carry out the inspection often to positive pole operating condition, adopts foraminiferous PVC sleeve pipe both can prevent that the positive pole surface from being washed away by the sea water, extension equipment life, is favorable to the installation of positive pole again to be changed, can guarantee that the electric potential of being protected is near +250mV, satisfies the anticorrosive requirement of equipment such as filter screen.

Description

Easy-to-replace cathode protection device for large drum-shaped rotary filter screen

Technical Field

The invention relates to an easily-replaceable cathode protection device for a large drum-shaped rotary filter screen, and belongs to the field of cathode protection.

Background

Seawater is a harsh corrosive medium, metals are easily corroded in seawater, and chemical factors such as dissolved oxygen, salt content, conductivity and pH value in seawater, physical factors such as temperature, pressure and flow velocity of seawater, and biological factors such as marine organisms and microorganisms in seawater all influence metal corrosion. In the seawater, if no effective protection measures are taken for metal structures such as bridges, platforms, ships, coastal power plants, seawater cooling systems of nuclear power plants and the like, damage or failure due to corrosion can occur within a few years, so that corrosion and protection in the seawater environment are very important technologies. For coastal power plants and nuclear power plants, a coating and cathodic protection combined corrosion prevention method is generally adopted to carry out combined protection on steel structures in a circulating water cooling system, so as to prevent corrosion or reduce corrosion.

The cathodic protection is to lead sufficient direct current to the protected object to generate cathodic polarization on the surface of the protected object, reduce or eliminate the electrode potential difference of various primary batteries causing the corrosion of the protected object, lead the corrosion current to tend to zero, and further achieve the purpose of preventing the corrosion of the protected object. The cathodic protection is divided into a sacrificial anode method (SACP) and an impressed current method (ICCP), and a proper protection method can be selected according to the working conditions of a medium and a protected structure in application. For water filtering facilities such as seawater pumps, large drum-shaped filter screens, condensers and the like, impressed current cathodic protection is generally adopted, and in order to adapt to the installation of different structures, the auxiliary anode can adopt plug-in, embedded and bracket type installation structures.

At present, the conventional impressed current cathodic protection system is used for structures such as a rotary drum-shaped filter screen, a grid, a guide groove and the like, and a bracket type auxiliary anode structure (see fig. 1) is adopted, and an auxiliary anode 1 of the impressed current cathodic protection system is connected with a protected wall 3 by adopting a bracket 2. The disadvantages are that: the installation is complicated, the expense is high, and supplementary positive pole 1 belongs to disposable installation in addition, is unfavorable for anode damage back and changes, also is not convenient for daily inspection and maintenance.

Disclosure of Invention

The invention aims to provide an easily replaceable large drum-shaped rotary filter screen cathode protection device, which solves the problems of complex installation and high cost in the prior art; the auxiliary anode is installed at one time, which is not beneficial to the replacement of the damaged anode and is not convenient for daily inspection and maintenance.

The technical scheme of the invention is as follows: the cathode protection device is characterized in that a linear anode assembly is arranged around the drum-shaped rotary filter screen, the linear anode assembly comprises an ammeter, tubular metal oxide anodes, cables and perforated sleeves, the ammeter and the tubular metal oxide anodes are connected in series through the cables and are arranged in the perforated sleeves, and the ammeter is positioned at the uppermost end; the top end and the bottom end of the sleeve with the hole are respectively fixedly connected with a building body around the drum-shaped rotary filter screen; the position of each tubular metal oxide anode corresponds to the hole on the wall of the sleeve with the hole.

The top end of the sleeve with the hole is hung at the top of the building body, and the bottom end of the sleeve with the hole is connected with the building body through a fixed support.

The outside of cable be equipped with the cable pillar, this cable pillar is fixed in foraminiferous sheathed tube axle center through a plurality of fixing clips, the fixing clip of least significant end with this fixed bolster with the building body coupling, other part or whole fixed bolsters with this fixed bolster with the building body coupling.

The sleeve with the hole is a PVC pipe.

The invention has the advantages that: compared with the traditional cathode protection device, the device has the advantages of simple operation, detachability, on-line detection and the like. The ammeter that this equipment was established ties can carry out the inspection often to positive pole operating condition, adopts foraminiferous PVC sleeve pipe both can prevent that the positive pole surface from being washed away by the sea water, extension equipment life, is favorable to the installation of positive pole again to be changed, can guarantee that the electric potential of being protected is near +250mV (for zinc reference electrode, the same down), satisfies the anticorrosive requirement of equipment such as filter screen.

Drawings

FIG. 1 is a schematic view of a prior art mounting structure of a bracket-type auxiliary anode;

FIG. 2 is an overall schematic block diagram of an embodiment of the present invention;

FIG. 3 is a schematic structural view of the linear anode assembly of FIG. 2;

fig. 4 is a sectional view a-a of fig. 3.

Description of reference numerals: 1-an auxiliary anode; 2, a bracket; 3, a protected wall; 4, building; 5-an anode assembly; 51-an ammeter; 52-tubular metal oxide anode; 53-a cable; 54-cable sheathing; 55-sleeve with hole; 56, fixing a card; 6-seawater; 7, fixing a bracket; 8-drum rotary filter screen (protected body).

Detailed Description

Referring to fig. 2 and 4, the cathode protection device for easily replaceable large drum-shaped rotary filter screen of the present invention is characterized in that two linear anode assemblies 5 (the number of which may be determined according to the requirement) are uniformly arranged around the drum-shaped rotary filter screen 8, wherein each linear anode assembly 5 comprises an ammeter 51, a tubular metal oxide anode 52, a cable 53, a perforated sleeve 55 and a fixing clip 56, the ammeter 51 and the plurality of tubular metal oxide anodes 52 are connected in series through the cable 53 and are arranged in the perforated sleeve 55, and the ammeter 51 is located at the uppermost end; the perforated sleeve 55 is a PVC pipe. A cable protective tube 54 is provided outside the cable 53.

The top end of the linear anode assembly 5 (namely the perforated sleeve 55) is hung at the top of the building body 4, and the linear anode assembly 5 is basically parallel to the protected body (the drum-shaped rotary filter screen 8). The outer side of the cable is provided with a cable protective pipe 54, the cable protective pipe 54 is fixed on the axis of the perforated sleeve 55 through a plurality of fixing clips 56, and the fixing clip 56 at the lowest end is connected with the building body 4 through the fixing bracket 7. Other fixing clips 56 can be connected to the building body 4 by fixing brackets 7.

Each tubular metal oxide anode 52 is positioned corresponding to a hole on the pipe wall of the perforated sleeve 55, so that the tubular metal oxide anode 52 is exposed to seawater, and the tubular metal oxide anode 52 is arranged in the perforated sleeve 55, so that seawater scouring can be prevented, and the work of the anode cannot be influenced. The top end of each string of tubular metal oxide anodes 52 is connected with an ammeter 51 in series, after the cathode protection system starts to work, the ammeter 51 records an initial value, if the value measured by the ammeter is zero in the working process of the system, the system transmits an alarm signal to a main controller, an operator can cut off the power supply and check, and if the anodes are damaged, the damaged tubular metal oxide anodes 52 (together with the cable 53 and the cable protection tube 54) can be taken out and replaced. Each linear anode assembly 5 is connected to a potentiostat positive electrode (conventional art, not shown) via a cable, and to a protected body negative electrode, and forms a circuit via seawater 6. After the cathodic protection system starts working, the potential of the protected body is shifted to be below +250mV through the constant potential rectifier, thereby achieving the purpose of inhibiting metal corrosion.

Claims

1. The cathode protection device is characterized in that a linear anode assembly is arranged around the drum-shaped rotary filter screen, the linear anode assembly comprises an ammeter, tubular metal oxide anodes, cables and perforated sleeves, the ammeter and the tubular metal oxide anodes are connected in series through the cables and are arranged in the perforated sleeves, and the ammeter is positioned at the uppermost end; the top end and the bottom end of the sleeve with the hole are respectively fixedly connected with a building body around the drum-shaped rotary filter screen; the position of each tubular metal oxide anode corresponds to the hole on the wall of the sleeve with the hole;

the top end of the sleeve with the hole is hung at the top of a building body, and the bottom end of the sleeve with the hole is connected with the building body through a fixed support;

the cable protection tube is arranged on the outer side of the cable and is fixed on the axis of the sleeve with the hole through a plurality of fixing clamps, the fixing clamp at the lowest end is connected with the building body through the fixing support, and other parts or all fixing clamps are connected with the building body through the fixing support;

when the cathode protection system starts to work, the ammeter records an initial value, if the value measured by the ammeter is zero in the working process of the system, the system transmits an alarm signal to the main controller, an operator can cut off the power supply and check, and if the anode is damaged, the damaged tubular metal oxide anode, the cable and the cable protective tube are taken out together for replacement.

2. The easily replaceable large drum spin screen cathode protector as claimed in claim 1, wherein the perforated sleeve is PVC tubing.