CN1854087A - Water treating agent of boiler - Google Patents

Abstract

A boiler water treatment chemical consists of sodium hydrate, monometallic sodium orthophosphate, hydroxyl-ethylene phosphoric acid, ethylenimine, hydrazine, sodium humate, sodium sulfite, sodium phosphate and deionized water. It has better water quality and saves energy sources.

Description

A kind of water treating agent for boilers

Technical field

The invention belongs to chemical industry and water treatment field, relate to a kind of water conditioner, further, the present invention relates to a kind of water treating agent for boilers.

Background technology

The equipment material of boiler systems generally is different from other industrial cycle equipment, and its easier comparatively speaking fouling, often needs clean.At present mostly existing a lot of restrainers are at the various recycle systems, and when being applied to boiler systems, its corrosion mitigating effect is subjected to great limitation.

A kind of qualified water treating agent for boilers must play scale inhibition and the double effect of inhibition effectively.Scale inhibition mainly is meant the scale inhibition to boiler body, and the object of inhibition comprises the pipeline that boiler body and steam pass through, heat exchanger and condensing water conduit.

Ca ²⁺, Mg ²⁺Be main incrustation ion, employed in the market boiler mostly is furnished with ion-exchanger and removes them.But other some solvability salts are owing to the concentration and evaporation of pot water in the water, and concentration constantly increases, and still has to exceed its solubleness and the possibility of fouling.Particularly at high temperature positions such as smoke pipes, because the strong vaporization of urgency of water, cause that probably some salt separates out because of the too high crystallization of partial concn.The boiler of Here it is many use softening waters is the reason of fouling still.Though this phenomenon can be eased by increasing blowdown flow rate, this wastes a large amount of energy on the one hand, because the increase of blowdown flow rate makes the pot alkalinity of water descend, usually is lower than the lower limit of national standard on the other hand, has accelerated corrosive speed.So it is very necessary that the pot hydromining is got suitable scale inhibition measure.

Dissolved oxygen in the water is the principal element that causes boiler corrosion.Because the speed of kettle temperature high-solubility oxygen and iron reaction is very fast.Boiler for no deoxygenator, adopt the measure of chemical deoxidization to be absolutely necessary, for the boiler that deoxygenator is arranged, because present deoxygenator deoxygenation can not be thorough, the boiler of some discontinuous operations particularly, when every day firm blow-on, thermal deaerator does not almost have effect, is necessary so take chemical deoxidization as a kind of mode of remedying yet.

Causing another main factor of boiler corrosion is Fe ³⁺The heating system of closed is mostly adopted in present office building, hotel etc., and the water of condensation reuse can account for about 80% of boiler feedwater, if steam-pipe, condensing water conduit, the inhibition measure that positions such as heat exchanger are unnecessary, the iron of pipe surface just dissolving enter in the condensed water, because Fe ³⁺Have stronger oxidisability, can accelerate the speed of boiler corrosion greatly.

CO in the boiler feedwater ₂Gas is overflowed from water owing to being heated after entering boiler, together enters heat exchanger with steam, is dissolved in again in the water of condensation, makes water be acid.The corrosion of iron is accelerated greatly under acidic conditions, and a large amount of iron dissolve in the condensed water, have to sometimes condensed water is drained, because condensing water temperature is higher, this certainly will cause a large amount of wastes of the energy.Therefore, need address this problem.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of water treating agent for boilers, and according to weight percent, the prescription of employing is as follows:

Sodium hydroxide: 3-4%

SODIUM PHOSPHATE, MONOBASIC: 1-2%

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 15-20%

Hexahydroaniline: 5-7%

Diamine: 4-6%

Sodium humate: 0.1-1%

S-WAT: 1-3%

Tertiary sodium phosphate: 2-3%

Deionized water: 60-70%.

As preferred embodiment a kind of, water treating agent for boilers of the present invention is according to weight percent, and the prescription of employing is as follows:

Sodium hydroxide: 3.2%

SODIUM PHOSPHATE, MONOBASIC: 1.6%

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 16%

Hexahydroaniline: 6%

Diamine: 4.8%

Sodium humate: 0.4%

S-WAT: 2%

Tertiary sodium phosphate: 2.4%

Deionized water: 63.6%.

Water treating agent for boilers of the present invention mainly contains compositions such as organic poly-phosphine carboxylate salt, dispersion agent, Scale inhibitors, oxygen scavenger, is alkalescence, and outward appearance is black, and is little thick, density about 1.1 * 10 ³Kg/M ³Medicament of the present invention can both keep high efficiency in wider temperature range and pressure range.Because boiler internal flue, furnace wall, upcast, downtake, economizer etc. are located temperature surface appearance etc. and are not quite similar, the moulding mechanism of incrustation scale, the composition of dirt is also different, single Scale inhibitors often can not be taken into account comprehensively, even can cause the adverse consequences that throw out increases, severe patient also can cause pipe to stop up and cause pipe explosion accident.Water conditioner of the present invention is then at the moulding mechanism of incrustation scale under the different situations, select for use multiple effective Scale inhibitors with strong points scientifically to combine, can destroy the lattice rule preface of incrustation scale effectively, make incrustation scale loose come off powdered, or incrustation scale is evenly dispersed in agglutination in the water, or the incrustation ion chelating is become inner complex.Antiscale in several ways can also be removed original a small amount of dirt dissolving in the pot.

The inventor is also according to different inhibition mechanisms; the characteristic of bonded boiler High Temperature High Pressure has added multiple inhibiter in water conditioner of the present invention, because these Synergism of Inhibitors; in conjunction with the oxygen scavenger of medicament of the present invention, can protect the boiler corrosion effectively again.Facts have proved that this polycomponent inhibiter not only corrosion mitigating effect is good, and have good thermostability.

The disadvantage of traditional inorganic oxygen scavenger is the saltiness that increases pot water, and traditional organic oxygen scavenger is subjected to the restriction of temperature condition.Oxygen scavenger in the medicament of the present invention is organic oxygen scavenger, and this oxygen scavenger easily decomposes when high temperature, but degradation production has very strong deoxygenation ability equally.The speed of response of this oxygen scavenger and dissolved oxygen is exceedingly fast, can before entering boiler, remove supplementary feed most dissolved oxygen, oxygen scavenger, the iron of boiler inner wall and the situation that dissolved oxygen reacts simultaneously of having avoided traditional oxygen scavenger to occur in use after adding in the supplementary feed pipeline.In addition, this oxygen scavenger can also reduce the Fe of supplementary feed ³⁺, the Fe of generation ²⁺Can be become stable compound by the sequestrant chelating in the medicament of the present invention, eliminate its detrimentally affect boiler.

Multiple vapour-phase inhibitor in the water conditioner of the present invention can seethe with excitement and steam participates in circulation together with water, effectively the protect concrete waterpipe.After boiler used water conditioner of the present invention, condensed water was slight alkalinity, and the limpid inclusion-free of water quality is better than the requirement that boiler is mended knot water far away.Because the temperature of condensed water is higher, only the condensed water reuse just can reduce fuel consumption 20-40%, and obviously the benefit of bringing therefrom is considerably beyond input cost.

Embodiment

Water treating agent for boilers according to preferred formulated this law provided by the present invention, be specially: sodium hydroxide 3.2%, SODIUM PHOSPHATE, MONOBASIC 1.6%, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 16%, hexahydroaniline 6%, diamine 4.8%, sodium humate 0.4%, S-WAT 2%, tertiary sodium phosphate 2.4%, deionized water 63.6% are ready for use on follow-up boiler water processing.

Claims (2)

1. a water treating agent for boilers is characterized in that, according to weight percent, the prescription of employing is as follows:

Sodium hydroxide: 3-4%

SODIUM PHOSPHATE, MONOBASIC: 1-2%

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 15-20%

Hexahydroaniline: 5-7%

Diamine: 4-6%

Sodium humate: 0.1-1%

S-WAT: 1-3%

Tertiary sodium phosphate: 2-3%

Deionized water: 60-70%.

2. water treating agent for boilers as claimed in claim 1 is characterized in that, according to weight percent, the prescription of employing is as follows:

Sodium hydroxide: 3.2%

SODIUM PHOSPHATE, MONOBASIC: 1.6%

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 16%

Hexahydroaniline: 6%

Diamine: 4.8%

Sodium humate: 0.4%

S-WAT: 2%

Tertiary sodium phosphate: 2.4%

Deionized water: 63.6%.