CN1276063C

CN1276063C - Low temperature ash-eliminating agent

Info

Publication number: CN1276063C
Application number: CN 03116859
Authority: CN
Inventors: 门振镒
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-05-12
Filing date: 2003-05-12
Publication date: 2006-09-20
Anticipated expiration: 2023-05-12
Also published as: CN1548503A

Abstract

The present invention relates to a low-temperature ash-removing agent. The present invention is characterized in that the percent of the component and the weight is 1 to 15% of manganese oxide (MnO2), 0 to 6% of cupric chloride dihydrate (CuCl2), 30 to 42% of sodium nitrate (NaNO3), 33 to 45% of ammonium chloride (NH4Cl), 1 to 18% of magnesium oxide (MgO) and 0 to 10% of zinc oxide (ZnO) (called zinc ash commonly). The present invention lowers the fire point of fly ash to 200 DGE C to 220 DGE C by introducing manganese oxide to be used as main catalysts. The present invention is used for facilities, such as exhaust boilers, ship main boiler, ship auxiliary boilers, industrial boilers, life boilers, power station boiler economizers, air preheaters, etc. The components act on soot together, carbon in ash is combusted under the working temperature of 200 DGE C to 250 DGE C, the discharge of sulfur dioxide and oxynitride is reduced, and the function of inhibition protection is performed to heat transfer surfaces.

Description

The low temperature deashing agent

Technical field

The present invention is that a kind of being added to is used for removing the boiler surface soot confection of (also claiming cigarette ash or crock), especially a kind of low temperature deashing agent that is used for scavenging (waste heat) boiler smoke in flue or the burner hearth.

Background technology

The deashing agent product can be indicated in U.S. De Lu company " profound energy " cigarette ash scavenging agent and the clever PN1001 cigarette ash of the green wave of Britain scavenging agent; English Patent 1378882 also has relevant record with German Patent 2413520.The medicament component that they adopt is selected for use from following compound mostly:ammonium chloride, cupric chloride, sodium-chlor, iron (ic) chloride, ammonium nitrate, saltpetre, magnesiumcarbonate, lime carbonate, sodium sulfate, ferrous sulfate, copper powder, paraffin etc.Form the cigarette ash scavenging agent as the English Patent record with saltpetre, ammonium nitrate, magnesium basic carbonate, the German Patent record is formed the cigarette ash scavenging agent with ammonium chloride, cupric chloride, iron (ic) chloride, copper powder, pigment, filler.Ammonium nitrate, saltpetre are Nitrates, and in dust-cleaning agent, nitrate is sputtered on the long-pending firmly thing of soot, makes the cigarette ash modification, can form low melting point eutectic, form the trace blast with the carbon a large amount of in the soot and the sulphur of trace, make that incrustation is loosening to drop; But saltpetre is the raw material of making explosive, contacts, rubs with organism or clash into to cause burning or blast, and ammonium nitrate also is explosive material, is the raw material of making fireworks and explosive, and the two all belongs to one-level inorganic oxidizer, and it is unsafe being used for dust-cleaning agent.Cupric chloride is catalyzer and oxygenant preferably, vaporize at once when being heated, its vapor condensation is on soot deposits, infiltrate in the carbon and play katalysis, 300 ℃ of of of of of of the point of ignition of carbon is reduced to about, impel oxidation of coal to burn gradually, but cupric chloride can produces hydrogen chloride gas, increased the acidity of flue gas, the very strong crock of inapplicable removing acidity.Ammonium chloride also is cigarette ash modification salt to be spattered on hard long-pending thing can form low melting point eutectic, makes black dirt become low-melting-point liquid and falls down, and salt produces positive charge ion and can prevent that the formation of dust stratification from reducing SO in the cigarette ash Xia the Zai high temperature simultaneously₃, reduce corrosion to the metal heat-conducting face, be compound preferably in the dust-cleaning agent.

Chinese patent application specification sheets CN1070677A discloses the deashing agent of being made up of SODIUMNITRATE, magnesium oxide, ammonium chloride, zinc oxide, cupric chloride, its ash-removal effect improves, make the burning-point of cigarette ash drop to 250 ℃, but employed copper chloride content is more, it is acid that flue gas is, especially when dewfall boiler is had corrosion after the blowing out, burning-point reduces not enough in addition, and is bad at 200 ℃ of-250 ℃ of through exhaust gas boiler ash-removal effects to working temperature.

Summary of the invention

Because modern large combustion machine exhaust temperature can be hanged down to 200 ℃-250 ℃, and used fuel oil is generally the high boiling point low-quality fuel oil, contain more vanadium, sodium, sulphur, the burning back produces a large amount of carbon granules and contains the cigarette ash and the mud of sulphur trioxide, on waste gas (waste heat) the boiler heat conduction tube wall of exhaust system, generate hard scale, be so-called cigarette ash, be difficult to remove, not only hinder thermal conduction but also corrode tube wall.Purpose of the present invention just provides a kind of working temperature at the low temperature deashing agent that 200 ℃ of-250 ℃ of waste gas (waste heat) boiler uses, and adds timely and appropriately in the burner hearth of waste gas (waste heat) boiler, can remove this cigarette ash.

Technical scheme of the present invention is: a kind of low temperature deashing agent is characterized in that its composition and weight percent are: manganese oxide (MnO ₂) 1-15%, cupric chloride (CuCl ₂) 0-6%, SODIUMNITRATE (NaNO ₃) 30-42%, ammonium chloride (NH ₄Cl) 33-45%, magnesium oxide (MgO) 1-18%, zinc oxide (ZnO) (being commonly called as zinc gray) 0-10%.

The present invention introduces manganese oxide as main catalyzer on the disclosed scheme of Chinese patent application specification sheets CN1070677A basis, other ratio of component is adjusted, and can make the burning-point of cigarette ash drop to 200 ℃-220 ℃.In this programme manganese oxide be catalyzer be again oxygenant, the time impel oxidation of coal in the cigarette ash in burning, suppress the formation of carbon, especially the oiliness cigarette ash that the power set of the fuel oil inferior that burns is discharged has stronger deashing descale effect.Cupric chloride and manganese oxide use simultaneously as promotor mutually in this programme, can strengthen activity of such catalysts, but in order to reduce the generation of hydrogenchloride, the consumption of cupric chloride is limited in below 6%, cigarette ash is acid strong, the consumption of cupric chloride is few, and the crock very strong to acidity (pH value is less than 2.1) is then without cupric chloride.SODIUMNITRATE, ammonium chloride make the cigarette ash modification, form low melting point eutectic with hard long-pending thing, incrustation is become flexible drop.The acid that magnesium oxide, zinc oxide generate in can neutralization reaction as basic oxide, magnesium oxide can also make that the vanadium oxide fusing point improves in the cigarette ash, change the stickiness of cigarette ash, and the dust stratification on heat-transfer surface becomes loose and drops.Above component acting in conjunction is in soot, and under 200 ℃-250 ℃ operational temperature conditions, the carbon in the black dirt is all burnt, and has reduced the discharging of sulfurous gas and oxynitride, and thermal conductive surface is played the inhibition protection effect.

Embodiment

Cigarette ash (soot) itself is tart, and the tart power is caused by contained impurity of fuel and combustion position.The LIGHT DIESEL OIL sulfur-bearing is few, and a little less than the cigarette ash acidity after the combustion, its pH value can be more than 2.8; Inferior heavy diesel oil sulfur-bearing is more, and the cigarette ash after the combustion is acid strong, and its pH value can be below 2.1.The specific embodiment of the present invention is will be according to the proportioning of selected each component of sooty pH value.

Embodiment one, is applicable to pH value at the slightly acidic soot more than 2.8, and deashing agent composition and weight percent are: manganese oxide 1-5%, cupric chloride 6%, SODIUMNITRATE 35%, ammonium chloride 42%, magnesium oxide 10%, zinc oxide (zinc gray) 2-7%.After the burning, soot disappears, and the cindery pH value under dropping is about 6.5.

Embodiment two, are applicable to pH value at the acid soot below 2.8, more than 2.1, and deashing agent composition and weight percent are: manganese oxide 2-11%, cupric chloride 4-6%, SODIUMNITRATE 33-42%, ammonium chloride 33-45%, magnesium oxide 1-11%, zinc oxide (zinc gray) 5-10%.After the burning, soot disappears, and the cindery pH value under dropping is at 7-7.8.

Embodiment three, are applicable to pH value at the strongly-acid soot below 2.1, and deashing agent composition and weight percent are: manganese oxide 10-15%, cupric chloride 0%, SODIUMNITRATE 30%, ammonium chloride 40%, magnesium oxide 18%, zinc oxide (zinc gray) 0-2%.After the burning, soot disappears, and the cindery pH value under dropping is about 8.

Preparation method of the present invention fully mixes by component ratio, generally earlier with manganese oxide, Copper chloride, ammonium chloride are mixed and form cuprammonium, manganese ammonium complex compound together, and then add successively nitre Acid sodium, magnesia and zinc oxide are made mixture of powders at last. During use, spray into stove with nozzle Thorax is regulated frequency and the straying quatity that sprays into according to the ash-removal effect that manifests. The present invention is useless except being used for Outside the gas boiler, also can be used for the major-minor boiler in naval vessel, Industrial Boiler, boiler for domestic and station boiler warp The facilities such as Ji device, air preheater.

Claims

1. a low temperature deashing agent is characterized in that its composition and weight percent are: manganese oxide 1-15%, cupric chloride 0-6%, SODIUMNITRATE 30-42%, ammonium chloride 33-45%, magnesium oxide 1-18%, zinc oxide 0-10%.

2. low temperature deashing agent according to claim 1 is characterized in that its composition and weight percent are: manganese oxide 1-5%, cupric chloride 6%, SODIUMNITRATE 35%, ammonium chloride 42%, magnesium oxide 10%, zinc oxide 2-7%.

3. low temperature deashing agent according to claim 1 is characterized in that its composition and weight percent are: manganese oxide 2-11%, cupric chloride 4-6%, SODIUMNITRATE 33-42%, ammonium chloride 33-45%, magnesium oxide 1-11%, zinc oxide 5-10%.

4. low temperature deashing agent according to claim 1 is characterized in that its composition and weight percent are: manganese oxide 10-15%, cupric chloride 0%, SODIUMNITRATE 30%, ammonium chloride 40%, magnesium oxide 18%, zinc oxide 0-2%.