CN105200442A

CN105200442A - Boiler detergent

Info

Publication number: CN105200442A
Application number: CN201410702361.0A
Authority: CN
Inventors: 董亚伦
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-11-29
Filing date: 2014-11-29
Publication date: 2015-12-30

Abstract

The invention relates to a boiler detergent, and belongs to the field of chemical cleaning. The boiler detergent comprises EDTA, soluble barium salt, a buffering agent, a buffered corrosive agent, a reducing agent and hydrochloric acid; under the action of hydrochloric acid, iron rust, silicate and carbonate can be dissolved, in addition, as the detergent contains barium salt, compact calcium sulfate and magnesium sulfate boiler scale can be dissolved, EDTA is added, dissolution of boiler scale is accelerated, the efficiency is improved, the buffering agent and the buffered corrosive agent can prevent corrosion of the detergent to the boiler wall, and the reducing agent can reduce ferric iron into ferrous iron to prevent hydrolysis of ferric iron from causing turbidness of the detergent. The boiler detergent provided by the invention is low in cost, can remove scale under various situations, is good in the descaling effect, and is non-corrosive to equipment.

Description

A kind of boiler detergent

Technical field

The present invention relates to chemical industry cleaning field, be specifically related to a kind of boiler detergent.

Background technology

Through long-play, inevitably there is incrustation scale, corrosion problem in boiler.Due to the generation of dirt, thermal conduction is deteriorated, so that boiler effect reduces, therefore be difficult to reach specified steam output; And because thermal conduction is deteriorated, make metal superheat, under boiler pressure effect, boiler tube generation bulge, even explodes; Therefore, after gyp, necessary method scale removal should be taked.The coking of fire coal, fuel-oil or fuel-gas boiler, carbon distribution situation, desulfurization, deashing etc. are all that we will in the face of the problem with process.

Single structure from boiler, drum, water wall tube, convection bank, smoke pipe and fire tube, downtake, header, superheater, economizer and auxiliary facility all can pollute because of production reason and corrode, boiler heat-transfer is deteriorated, fuel consumption increases, working cost rises, and boiler life shortens.

The harm of incrustation scale can be summarized as follows:

1. waste fuel, reduce boiler thermal output

Because the little decades of times of thermal conductivity of the thermal conductivity ratio steel of incrustation scale is to hundreds of times.Therefore when boiler has incrustation scale, the heat transfer property of boiler surface is deteriorated, fuel combustion institute liberated heat can not be delivered in feedwater effectively, a large amount of heats is taken away by flue gas, cause funnel temperature to raise, heat loss due to exhaust gas increases, and the thermo-efficiency of boiler reduces.In this case, for ensureing the parameter of boiler, just must add fuel more, improving temperature and the flue-gas temperature of burner hearth, therefore causing waste of fuel.Someone estimates, boiler surface has the incrustation scale that 1mm is thick, waste fuel about 3% ~ 5%.

2. affect safe operation of the boiler

Boiler scale is usually created on the very high boiler surface of thermal load.Because incrustation scale heat conductivility is very poor, metal pipe-wall local temperature is caused greatly to raise.When temperature has exceeded the allowable temperature that metal can bear, the overheated and creep of because of metal, intensity has reduced, and under boiler working pressure, bulge can occur metal, bore a hole and break, affect safe operation of the boiler.

3. incrustation scale can cause metal corrosion under scale

Under the condition having incrustation scale to adhere in boiler surface, from the hole of incrustation scale, the pot water that infiltrates of gap, sharply evaporate between the scale crust and boiler surface of deposition.Under scale crust, pot water can be concentrated to very high density.Wherein some material can produce heavy corrosion, as NaOH etc. to boiler surface under the condition of high-temperature high concentration.Fouling, corrosion process are mutually promoted, and can cause the damage of metal heated very soon, to cause boiler generation pipe explosion accident.

4. reduce boiler output

After gyp, because thermal conduction is deteriorated, boiler rated evaporating capacity or specified quantity of heat production is reached, just need many consume fuel.But along with the increase of fouling thickness, and the grate area of furnace volume is certain, and fuel consumption is restricted, therefore exerting oneself of boiler will be reduced.

5. fouling can reduce boiler work-ing life

Incrustation scale on boiler surface, must thoroughly remove guarantee safe and economical boiler and run.Artificial, mechanical or employing pharmaceutical chemicals scale removal all can affect the work-ing life of boiler.

General boiler can adopt scale remover scale removal under three kinds of states:

1st class: new boiler, from dispatching from the factory to installing, is still no more than 10 months, the thinner or rustless person of inner iron rust.

IIth class: boiler Long-time Shut-down, or the inner iron rust of new boiler comparatively thick one.

IIIth class: moving dress boiler internal has thicker iron rust, the person that has incrustation scale again.

And these three kinds of states generally can adopt different scale removers, and scale remover general at present exist price high, certain corrosion is existed to equipment and descale effect is not fine.

Summary of the invention

For above Problems existing, the object of the present invention is to provide a kind of boiler detergent, this scale remover cost is low, can scale removal in all cases, and features high scale-removing effect is corrosion-free to equipment.

The technical solution used in the present invention is as follows: a kind of boilercompound, is characterized in that, its composition component is:

EDTA0.2-2mol/l

Soluble barium salt 0.2-1mol/l

Buffer reagent 0.1-0.5mol/l

Corrosion inhibitor 0.05-0.5mol/l

Reductive agent 0.1-0.5mol/l

Hydrochloric acid 0.5-2mol/l.

Described soluble barium salt is at least one in bariumchloride, barium acetate, nitrate of baryta.

Described buffer reagent is at least one in sodium-acetate, Potassium ethanoate, ammonium acetate.

Described corrosion inhibitor is at least one in Lan-826, IS-129, IS-156, tetrahydroglyoxaline.

Described reductive agent is at least one in hydrazine hydrate, tin protochloride, xitix.

Compound method of the present invention is: in the sealed plastic container with stirring, under whipped state, hydrochloric acid is configured to the hydrochloric acid of 0.5-2mol/l, add EDTA again, soluble barium salt, buffer reagent, corrosion inhibitor, reductive agent be dissolved into prescribed concentration, solvent temperature is room temperature, then be stirred to all reagent to be dissolved into completely in water, stir again and fully mix to all the components for 30-180 minute, then load in the plastic containers of sealing stand-by.

Principle of the present invention is: the dirty main component due to boiler is iron rust, calcium sulfate, magnesium sulfate, silicate, carbonate, under hydrochloric acid effect, iron rust, silicate, carbonate can be dissolved, and owing to containing barium salt in scale remover, fine and close calcium sulfate can become barium sulfate with barium salt with magnesium sulfate bird nest, barium sulfate is suspended in scale remover, calcium magnesium salts to be dissolved in scale remover thus to reach removes fine and close calcium sulfate, the object of magnesium sulfate bird nest, add EDTA, because the complex ability of EDTA and metal ion is strong, thus the dissolving of bird nest can be accelerated, raise the efficiency, buffer reagent and corrosion inhibitor can prevent scale remover to the corrosion of boiler wall, reductive agent can reduce ferric iron and become ferrous iron and prevent ferric hydrolysis from causing the muddiness of scale remover.

The invention has the beneficial effects as follows: this scale remover cost is low, can scale removal in all cases, features high scale-removing effect, corrosion-free to equipment.

Embodiment

embodiment 1

In the sealed plastic container with stirring, under whipped state, hydrochloric acid is configured to the hydrochloric acid of 1mol/l, add EDTA again, bariumchloride, ammonium acetate buffer reagent, IS-156 corrosion inhibitor, Reduction with Stannous Chloride agent be dissolved into concentration and be respectively 0.2mol/l, 0.4mol/l, 0.3mol/l, 0.3mo/l, 0.25mol/l, solvent temperature is room temperature, then be stirred to all reagent to be dissolved into completely in water, stir again and fully mix to all the components for 60 minutes, stand-by in sealed plastic container.

embodiment 2

In the sealed plastic container with stirring, under whipped state, hydrochloric acid is configured to the hydrochloric acid of 1.5mol/l, add EDTA again, barium acetate, sodium acetate buffer agent, tetrahydroglyoxaline corrosion inhibitor, xitix reductive agent be dissolved into concentration and be respectively 0.2mol/l, 0.25mol/l, 0.25mol/l, 0.2mo/l, 0.2mol/l, solvent temperature is room temperature, then be stirred to all reagent to be dissolved into completely in water, stir again and fully mix to all the components for 90 minutes, stand-by in sealed plastic container.

embodiment 3

In the sealed plastic container with stirring, under whipped state, hydrochloric acid is configured to the hydrochloric acid of 1.8mol/l, add EDTA again, barium acetate, ammonium acetate buffer reagent, tetrahydroglyoxaline corrosion inhibitor, hydrazine hydrate reduction agent be dissolved into concentration and be respectively 0.2mol/l, 0.25mol/l, 0.35mol/l, 0.2mo/l, 0.2mol/l, solvent temperature is room temperature, then be stirred to all reagent to be dissolved into completely in water, stir again and fully mix to all the components for 120 minutes, stand-by in sealed plastic container.

embodiment 4

In the sealed plastic container with stirring, under whipped state, hydrochloric acid is configured to the hydrochloric acid of 1.8mol/l, add EDTA again, nitrate of baryta, ammonium acetate buffer reagent, Lan-826 corrosion inhibitor, hydrazine hydrate reduction agent be dissolved into concentration and be respectively 0.2mol/l, 0.35mol/l, 0.35mol/l, 0.25mo/l, 0.25mol/l, solvent temperature is room temperature, then be stirred to all reagent to be dissolved into completely in water, stir again and fully mix to all the components for 60 minutes, stand-by in sealed plastic container.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. a boilercompound, is characterized in that, its composition component is:

EDTA0.2-2mol/l

Soluble barium salt 0.2-1mol/l

Buffer reagent 0.1-0.5mol/l

Corrosion inhibitor 0.05-0.5mol/l

Reductive agent 0.1-0.5mol/l

Hydrochloric acid 0.5-2mol/l.

2. a kind of boilercompound according to claim 1, is characterized in that, described soluble barium salt is at least one in bariumchloride, barium acetate, nitrate of baryta.

3. a kind of boilercompound according to claim 1, is characterized in that, described buffer reagent is at least one in sodium-acetate, Potassium ethanoate, ammonium acetate.

4. a kind of boilercompound according to claim 1, is characterized in that, described corrosion inhibitor is at least one in Lan-826, IS-129, IS-156, tetrahydroglyoxaline.

5. a kind of boilercompound according to claim 1, is characterized in that, described reductive agent is at least one in hydrazine hydrate, tin protochloride, xitix.