CN104129862A

CN104129862A - Cleaning agent for removing boiler silicon scale

Info

Publication number: CN104129862A
Application number: CN201410372222.6A
Authority: CN
Inventors: 程晓婷; 李洪社; 喻果
Original assignee: WEIHAI XIANGYU ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Current assignee: WEIHAI XIANGYU ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Priority date: 2014-07-31
Filing date: 2014-07-31
Publication date: 2014-11-05

Abstract

The invention relates to a cleaning agent for removing boiler silicon scale, and relates to boiler water treatment. The cleaning agent for removing boiler silicon scale comprises, in percent by weight, 10-15% of polycarboxylic acid, 40-50% of glycolic acid, 1-2% of a surfactant, 0.5-1% of a corrosion inhibitor, 2-3% of diethylene triaminepentaacetic acid (DTPA) ammonium salt, and the balance water. The preparation method comprises: successively adding water, polycarboxylic acid, glycolic acid, the surfactant, the corrosion inhibitor and DTPA ammonium salt into a container, stirring at room temperature for 10-15 min, so as to obtain the product. The product comprises the advantages that polycarboxylic acid, glycolic acid and DTPA ammonium salt are combined and have synergic effect, and have extremely strong solubilizing permeation peeling effects on silicon scale, and the cleaning agent is low in cost and substantial in effect.

Description

A kind of for removing the clean-out system of boiler silicon dirt

Technical field

The present invention relates to boiler water processing, is a kind of clean-out system of efficient removal boiler silicon dirt specifically.

Background technology

If the water that contains hardness just enters boiler without processing, after operation for some time, on feedwater side heating surface, will adhere to securely some solid deposits, this phenomenon is called fouling.The solid deposits of sticking on heating surface is just called incrustation scale.Under certain condition, solid sediment also can be separated out in pot water, is loose suspension, is called grain slag.Grain slag can be removed with blowdown, if but blowdown not in time, part grain slag also can be on heating surface or the slow position deposition of flow under and change into incrustation scale (being conventionally referred to as " secondary incrustation scale ").The reason of gyp, is first to contain calcium magnesium hardness or iron ion in feedwater, and silicone content is too high; Simultaneously again due to due to the High Temperature High Pressure special conditions of boiler.

Dirt in boiler scale, especially high-duty boiler, is mainly the vitriol of calcium magnesium and silicate, iron dirt, and they at high temperature form the composite salt of hard and compact; Dirt in hot water boiler is main mainly with carbonate scale, the iron dirt of calcium magnesium, and dirt is loose.And interchanger dirt mostly is carbonate, vitriol, iron dirt, silicon dirt and biological sludge in industrial etc., dirty porosity and looseness, is water-insoluble calcium carbonate and magnesium carbonate and various alkali formula molysite.Therefore, boiler acid pickling scale removal is more than general water-heater scale removal difficulty, complex process.

The dirt that hardness ions forms, common mineral acid, organic acid just can be removed; But the general chemical reagent of silicates dirt cannot be removed.

Summary of the invention

Product of the present invention is removed not thorough for boiler silicate scale in the past, complex operation, the shortcoming such as effect the is undesirable and one researched and developed is efficiently removed silicon scale washing agent, this clean-out system reaches more than 98% boiler silicon dirt clearance, and to boiler without any chemical corrosion.

Technical scheme of the present invention is that boiler silicon scale washing agent comprises that the weight percent of each component is:

Poly carboxylic acid 10-15%,

Oxyacetic acid 40-50%,

Tensio-active agent 1-2%,

Inhibiter 0.5-1%,

Diethylene triamine pentacetic acid (DTPA) amine salt 2-3%,

All the other are water.

Its preparation method is: water, poly carboxylic acid, oxyacetic acid, tensio-active agent, inhibiter, DTPA ammonium salt are added in container in proportion successively, at room temperature stir 10-15 minutes, obtain product.

The invention has the beneficial effects as follows: use DTPA ammonium salt replacement EDETATE SODIUM salt and EDTA ammonium salt descale effect good, not only silicon dirt is had to good removal effect, hardness ions dirt in boiler is also had to remarkable descale effect; Oxyacetic acid, poly carboxylic acid and DTPA ammonium salt compound aqueous solution have synergy, once molten effect of the complexing of its generation to the clearance of the stupid dirty silicon dirt of boiler up to more than 98%.

Operation instruction of the present invention: this product can adopt blowing out washing out method during equipment out of use, also can adopt not blowing out washing out method at equipment run duration; In the time carrying out not blowing out cleaning, this product usage quantity is generally 100-500ppm, sends into (concrete chemical feeding quantity is depending on scaling degree) in boiler by confluent.

embodiment

Embodiment 1:

Choose by weight percentage raw material

Poly carboxylic acid 15%,

Oxyacetic acid 40%,

Tensio-active agent 2%,

Inhibiter 1%,

Diethylene triamine pentacetic acid (DTPA) amine salt 2%,

All the other are water.

Water, poly carboxylic acid, oxyacetic acid, tensio-active agent, inhibiter, DTPA ammonium salt are added in container in proportion successively, at room temperature stir 10-15 minutes, obtain product.

Embodiment 2:

Choose by weight percentage raw material

Poly carboxylic acid 15%,

Oxyacetic acid 50%,

Tensio-active agent 2%,

Inhibiter 0.5%,

Diethylene triamine pentacetic acid (DTPA) amine salt 1.5%,

All the other are water.

application test and result

1. test sample source: embodiment 1, embodiment 2.

2. detect descaling rate experiment

2.1 test methods: adopt volumetric method in National Standard Method GB25148 to judge descaling rate.

2.2 processs of the test: get two steel pipes that silicate deposition is serious, in access detergent line, clean steel pipe 2h by the rinse water containing sample, be full of water gaging volume of water in steel pipe after cleaning.

2.4 test-results:

Can find out from experimental principle and table, the practical application effect of case study on implementation product of the present invention, completely up to standard; As long as add this product by confluent in cleaning boiler process, wash cycles 2-3h can remove the silicon dirt in boiler.

Claims

1. for its component of clean-out system of removing boiler silicon dirt be: comprise water, poly carboxylic acid, oxyacetic acid, tensio-active agent, inhibiter, a DTPA ammonium salt, the weight percent of each component is:

Poly carboxylic acid 10-15%,

Oxyacetic acid 40-50%,

Tensio-active agent 1-2%,

Inhibiter 0.5-1%,

Diethylene triamine pentacetic acid (DTPA) amine salt 2-3%,

All the other are water.

2. as described in right 1, the poly carboxylic acid in formula can be the one of polyacrylic acid, polymaleic acid.

3. the tensio-active agent in filling a prescription as claimed in claim 1 can be one or more of emulsifying agent ABS, OP-10 or 1227.

4. the inhibiter in filling a prescription is as claimed in claim 1 one or more of copper inhibitor or carbon steel corrosion inhibitor.

5. the preparation method of boiler silicon scale washing agent is as claimed in claim 1: water, poly carboxylic acid, oxyacetic acid, tensio-active agent, inhibiter, DTPA ammonium salt are added in container in proportion successively, at room temperature stir 10-15 minutes, obtain product.