CN103255426A - Cathode protection method for bottom plate of high concentration coal slurry storage tank - Google Patents

Abstract

The invention discloses a cathode protection method for a bottom plate of a high concentration coal slurry storage tank, and in particular relates to the cathode protection method for the bottom plate of the high concentration coal slurry storage tank for conveying coal by a high concentration coal slurry pipeline in a long distance. The method comprises the following steps that: (1) the anode groundbed at the bottom of the storage tank is a netty anode groundbed consisting of an MMO (Mixed Metal Oxide) ribbon anode and a conductive titanium sheet, wherein the anode net is located in a sand layer of a tank base foundation and close to the bottom plate of the tank; (2) in order to ensure the accuracy and lasting effect of protective potential measurement of the bottom plate of the tank, each storage tank is provided with an appropriate amount of zinc reference electrodes and copper sulfate reference electrodes, wherein the zinc reference electrodes and the copper sulfate reference electrodes can be separately buried or jointly buried; and (3) in order to detect the protective effect of the bottom plate outside the storage tank, appropriate amount of test piles are installed in appropriate positions around each storage tank. The method is simple in construction, low in expense and small in occupied area, and is not limited by terrain. The bottom plate of the storage tank can be effectively protected by using the cathode protection method, so that the method is widely applied to protection of metal storage tanks.

Description

High density coal slurry storage tank bottom plate cathode protecting process

Technical field

The present invention relates to a kind of high density coal slurry storage tank bottom plate cathode protecting process, be specifically related to high density coal slurry storage tank bottom plate cathode protecting process.

Background technology

What impressed current mode anode groundbed was commonly used is shallow embedding distributing anode groundbed, deep-wall type anode groundbed, flexible anode groundbed.

Shallow embedding distributing anode groundbed system refers to that the depth of burying is no more than the anode groundbed of 15m.Its construction is simple, can bury underground according to requirement of engineering is distributed; Expense is low.Weak point is the protection potential skewness, and other metal structures existence are on every side disturbed; Influenced greatly by ground system; Limited by landform; Continuity in time, resistivity can increase, and influences the output of protective current.Be rarely used in the storage tank protection now.

Deep-wall type anode groundbed system refers to that in the underground deep layer wellhole (well depth is greater than 15m usually) vertically installs the groundbed of or many anodes, and to be used for surface soil resistivity very high or spatial surface is narrow and small, can't satisfy under the envrionment conditions that shallow ground bed installing space and required anode grounding resistance require more.It is not subjected to landform to limit, take up an area of little; The anode groundbed stake resistance is little; Protection domain is big.Weak point is that construction is complicated, is subjected to the constraint of geologic condition; Need drilling well, one-time investment is than higher, and can not guarantee the success of once digging a well, and has greater risk.At present in storage tank protection, be mainly used in building storage tank after add protection or add protection.

Flexible anode ground bed system is a kind of softness, linear supplementary anode.The flexible anode advantage is more, and outward current is evenly distributed, and is serious even preservative coat destroys, even naked pipe, also can provide enough protective currents; Protection potential is evenly distributed, and has avoided overprotection and the not enough problem of protection in the protection; With strong points, very little to other metal structures disturbing influences; Be applicable to the edatope of different soils resistivity; Can effectively solve the shielding of complex grid internal area and mutual interference problem, can be according to on-the-spot needs intercepting random length.The weak point price is expensive slightly.

Summary of the invention

It is simple to the purpose of this invention is to provide a kind of construction, and expense is low, and protection potential is evenly distributed, and is not subjected to restriction, the little high density coal slurry storage tank bottom plate cathode protecting process of occupation of land of landform.

In order to overcome above-mentioned deficiency, technical scheme of the present invention is to solve like this: high density coal slurry storage tank bottom plate cathode protecting process, carry out as follows:

1), the tank bottom anode groundbed is formed the net like anode groundbed by MMO ribbon anode and conduction titanium sheet;

Described net like anode groundbed is arranged in the sand layer of jar base plinth, and the position of close tank bottom, the interval≤1m of described MMO anode strap, wherein MMO anode strap buried depth≤0.35m;

Interval≤the 4m of described conduction titanium sheet wherein conducts electricity the buried depth≤0.35m of titanium sheet, and anode strap, conduction titanium sheet all are arranged in the sand layer of jar base plinth;

2), every storage tank arranges zinc reference electrode and the copper sulfate reference electrode of at least one quantity, zinc reference electrode and copper sulfate reference electrode are separately buried underground or are buried underground together, zinc reference electrode and copper sulfate reference electrode all should be wrapped in the chemical coke, and zinc reference electrode and copper sulfate reference electrode are embedded in the position near storage tank bottom plate;

3), at least two detective poles should be installed in the position of every storage tank periphery, each test panel of detective pole has 4～8 connection terminals, all cathode cable and anode cables of being drawn by storage tank all should pass through the link box, introduce equipment again, have 8 covers in each link box and connect element.

The invention has the beneficial effects as follows: the storage tank bottom plate outer wall is behind brushing paint; in welding process, because welding high temperature 30% figure layer meeting breakage is arranged; not map brushing of weld layer in addition; have 50% base plate lower surface not scheme layer protection like this, MMO net like anode groundbed system by the titanium-based metal oxide anode with to putting the mutual webbed anode groundbed form of vertical laying of titanium connection piece.This anode groundbed can closely be laid with storage tank bottom plate, therefore can make cathodic protection current be evenly distributed, unshielded and disturb, can make characteristics such as jar center and peripheral protection potential basically identical; For the storage tank that anti seepage membrane is arranged, the protection effect is particularly good; Can adopt many energising point modes, make distribution of current more even.Construction is simple, and expense is low, and restriction, the occupation of land that can not be subjected to landform are little.Adopt cathode protecting process effectively to protect storage tank bottom plate, be widely used in the protection of metal tank.

Embodiment

Below in conjunction with embodiment so that summary of the invention is described further:

A kind of high density coal slurry storage tank bottom plate cathode protecting process is characterized in that carrying out as follows:

1), the tank bottom anode groundbed is formed the net like anode groundbed by MMO ribbon anode and conduction titanium sheet;

Described net like anode groundbed is arranged in the sand layer of jar base plinth, and the position of close tank bottom, the interval≤1m of described MMO anode strap, wherein MMO anode strap buried depth≤0.35m;

Interval≤the 4m of described conduction titanium sheet wherein conducts electricity the buried depth≤0.35m of titanium sheet, and anode strap, conduction titanium sheet all are arranged in the sand layer of jar base plinth;

2), every storage tank arranges zinc reference electrode and the copper sulfate reference electrode of at least one quantity, zinc reference electrode and copper sulfate reference electrode are separately buried underground or are buried underground together, zinc reference electrode and copper sulfate reference electrode all should be wrapped in the coke, and zinc reference electrode and copper sulfate reference electrode are embedded in the position near storage tank bottom plate;

3), at least two detective poles should be installed in the position of every storage tank periphery, each test panel of detective pole has 4～8 connection terminals, all cathode cable and anode cables of being drawn by storage tank all should pass through the link box, introduce equipment again, have 8 covers in each link box and connect element.

Given embodiment can not be interpreted as limiting the scope of the invention, thereby nonessential improvement and adjustment that the professional and technical personnel has done according to content and the design philosophy of foregoing invention also belong to protection scope of the present invention.

Claims (1)

1. high density coal slurry storage tank bottom plate cathode protecting process is characterized in that carrying out as follows:

1), the tank bottom anode groundbed is formed the net like anode groundbed by MMO ribbon anode and conduction titanium sheet;

Described net like anode groundbed is arranged in the sand layer of jar base plinth, and the position of close tank bottom, the interval≤1m of described MMO anode strap, wherein MMO anode strap buried depth≤0.35m;

Interval≤the 4m of described conduction titanium sheet wherein conducts electricity the buried depth≤0.35m of titanium sheet, and anode strap, conduction titanium sheet all are arranged in the sand layer of jar base plinth;

2), every storage tank arranges zinc reference electrode and the copper sulfate reference electrode of at least one quantity, zinc reference electrode and copper sulfate reference electrode are separately buried underground or are buried underground together, zinc reference electrode and copper sulfate reference electrode all should be wrapped in the coke, and zinc reference electrode and copper sulfate reference electrode are embedded in the position near storage tank bottom plate;

3), at least two detective poles should be installed in the position of every storage tank periphery, each test panel of detective pole has 4～8 connection terminals, all cathode cable and anode cables of being drawn by storage tank all should pass through the link box, introduce equipment again, have 8 covers in each link box and connect element.