CN102701470A

CN102701470A - Special corrosion and scale inhibitor for boiler

Info

Publication number: CN102701470A
Application number: CN2012101921211A
Authority: CN
Inventors: 程终发; 孔令广; 孙群峰; 刘强; 刘见; 侯敬恒
Original assignee: Shandong Taihe Water Treatment Co Ltd
Current assignee: Shandong Taihe Water Treatment Co Ltd
Priority date: 2012-06-12
Filing date: 2012-06-12
Publication date: 2012-10-03

Abstract

The invention provides a special corrosion and scale inhibitor for a boiler. The special corrosion and scale inhibitor is composed of hydroxyethylidene diphosphonic acid, ethylene diamine tetra (methylene phosphonic acid) sodium, diethylene triamine pentamethylene phosphonic acid, hydrolytic polymaleic anhydride, acrylic acid-hydroxypropyl acrylate copolymer and deionized water. The special corrosion and scale inhibitor has higher dispersion capability and higher calcium tolerance and still can effectively control scale formation under conditions of high hardness, high alkali, high iron, high pH and high temperature. The special corrosion and scale inhibitor can be matched with other traditional scale inhibition and dispersion agents for use, simultaneously has very higher corrosion inhibition capability and is a more ideal corrosion and scale inhibition dispersion agent for water treatment of the boiler.

Description

A kind of boiler special corrosion and scale inhibitor

Technical field

The invention belongs to the industrial circulating cooling water processing technology field, be specifically related to a kind of boiler special corrosion and scale inhibitor.

Background technology

Because of soluble ion and multiple acid ion and trace metal ions such as the calcium that contains different amts, magnesium, boiler recirculated water heat-transfer surface can produce incrustation scale or corrosion in the water body.The traditional water treatment technology of boiler is after its fouling, needs to stop to carry out physics or matting.If equipment fouling or corrode before cleaning will many consumes energy in the day-to-day operation process, increase the rate of water make-up and the blowdown flow rate of system, the waste great lot of water resources shortens service life of equipment.The use of boiler corrosion-and scaling-inhibiting water treating agent can make the dirt that generates in the boiler running process loose, the spallation, in small, broken bits that becomes gradually, is finally taken to boiler bottom by current; Outside blowdown discharge system, equipment avoids matting, forms layer protecting film at the equipment inwall simultaneously; Can fundamentally prevent corrosion and scale formation; Raising system heat exchanger effectiveness, energy-saving and cost-reducing, effectively prolong service life of equipment.

Patent CN1257841B proposes a kind of corrosion-retarding scale inhibitor for boiler, is made up of the raw material of following weight percentage: organic multicomponent phosphonic acids and salt 25 ~ 40% thereof, HPMA 30 ~ 45%; Zinc sulfate 2 ~ 7%; Nitrogen-containing heterocycle compound 1 ~ 3%, alkyl oxide 0.2 ~ 2%, surplus is a solvent.Patent CN102399010A discloses a kind of boiler and has used Scale inhibitors, is made up of Di-Sodium Phosphate 3-8 part, vinylformic acid 50-60 part, acryloyl isopropylamine base methylsulfonic acid 2-8 part following weight part.Patent CN101921021A discloses a kind of boiler scale inhibitor, is made up of EDTA Disodium 2 ~ 5% following weight percent; HPMA 5 ~ 10%, natrium humate 20 ~ 40%, sulfonic acid amber dicaprylate salt 2 ~ 3%; Urotropine 2 ~ 5%, ATMP 10 ~ 15%, water surplus.

In above patent, organic phosphonate since have inhibition and scale inhibition dual-use function form headed by the selection kind, but only depend on the corrosion inhibition of organic phosphonate, its effect is still not ideal enough, also need add has synergistic inhibiter with it.At present; Though Scale inhibitors commonly used can solve the scale problems of Industrial Boiler water treatment to a certain extent; But still having a lot of defectives, they are not high to the calcium ion tolerance in the water, scale inhibition ability drop in iron content and butyraceous water; With other water treating corrosion and scale inhibitors composite, compatibility is not fully up to expectations, can not reach the technical requirements of boiler scale-inhibition.

The present invention provides a kind of boiler special corrosion and scale inhibitor.

[ Summary of the invention]

The object of the present invention is to provide a kind of boiler special corrosion and scale inhibitor, technical solution of the present invention is:

The boiler special corrosion and scale inhibitor of being prepared, each constituent mass per-cent consists of:

HEDP: 5～10%;

Ethylene diamine tetra methylene phosphonic acid sodium: 1～8%;

Diethylene triamine pentamethylene phosphonic: 5～12%;

HPMA: 20～30%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 3～6%;

Deionized water: surplus.

Compared with prior art; Positively effect of the present invention is: suppress and the lattice distortion effect through the good chelating of organic phosphine, lower bound, and gather and the good dispersing property of thing to red oxide of iron, dirt, clay and grease, under, high ferro hard, high-alkali at height, high pH, the hot conditions; Still can control fouling effectively; And can with the composite use of other existing dirt dispersion agents, have very high corrosion inhibiting ability simultaneously, be a kind of comparatively ideal boiler special corrosion and scale inhibitor.

[ Embodiment]

Embodiment of the present invention below is provided.

Embodiment 1

A kind of boiler special corrosion and scale inhibitor forms by following mass percent configuration:

HEDP: 6%;

Ethylene diamine tetra methylene phosphonic acid sodium: 2%;

Diethylene triamine pentamethylene phosphonic: 6%;

HPMA: 21%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 4%;

Deionized water: surplus.

Embodiment 2

HEDP: 7%;

Ethylene diamine tetra methylene phosphonic acid sodium: 3%;

Diethylene triamine pentamethylene phosphonic: 7%;

HPMA: 22%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 5%;

Deionized water: surplus.

Embodiment 3

HEDP: 8%;

Ethylene diamine tetra methylene phosphonic acid sodium: 2%;

Diethylene triamine pentamethylene phosphonic: 6%;

HPMA: 22%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 5%;

Deionized water: surplus.

Embodiment 4 (most preferred embodiment)

HEDP: 5%;

Ethylene diamine tetra methylene phosphonic acid sodium: 8%;

Diethylene triamine pentamethylene phosphonic: 5%;

HPMA: 24%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 5%;

Deionized water: surplus.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the present invention's design; Can also make some improvement and retouching, these improvement and retouching also should be regarded as in protection scope of the present invention.

Claims

1. boiler special corrosion and scale inhibitor, it is characterized in that: its each constituent mass per-cent consists of:

HEDP: 5～10%;

Ethylene diamine tetra methylene phosphonic acid sodium: 1～8%;

Diethylene triamine pentamethylene phosphonic: 5～12%;

HPMA: 20～30%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 3～6%;

Deionized water: surplus.

2. a kind of boiler special corrosion and scale inhibitor according to claim 1 is characterized in that: each constituent mass per-cent is:

HEDP: 5%;

Ethylene diamine tetra methylene phosphonic acid sodium: 8%;

Diethylene triamine pentamethylene phosphonic: 5%;

HPMA: 24%;

Vinylformic acid-Propylene glycol monoacrylate multipolymer: 5%;

Deionized water: surplus.