CN1093741A - High-efficient combustion-supporting coke-knocking descaling additive for combustion furnace - Google Patents

Abstract

A kind of high-efficient combustion-supporting coke-knocking descaling additive for combustion furnace composition, it is by saltpetre SODIUMNITRATE complex compound (KNO ₃NaNO ₃), yellow soda ash (potassium), sodium-chlor (potassium), γ-ferric oxide, aluminum oxide, silicon oxide, magnesium oxide and calcium oxide are formed.It has tar uncombined carbon and low grade coal combustion-supporting, and the loose modification of cigarette ash coking is come off, and improves roasting kiln thermal conductance efficient, thereby save energy reduces the dusty gas discharging and slows down effect such as roasting kiln corrosion rate.Be widely used in the lumped coal of burning, the various roasting kilns of powder coal or oil, safety easy to use, and shelf-stable.

Description

High-efficient combustion-supporting coke-knocking descaling additive for combustion furnace

The invention belongs to bunker coal and oil are improved burning, reduce smog and the settling that does not need or be easy to remove cigarette ash and the additive that in fuel or fire, adds.

Burn when bunker coal, oil drop in the stove, divide the materials such as volatile combustible hydrocarbon polymer, hydrogen that are situated between, enter the prosperous strong stage of burning.But often because air capacity is under-supply, and volatile matter is difficult for after-flame in the fuel, be things such as uncombined carbon tar afterwards, form coking and fouling, black smoke and carbon monoxide, dusty gass such as various sulfur oxides, nitrogen oxide and divide to be situated between.Efficiency of combustion is reduced, and the calorific value of fuel fails to give full play to, and causes energy dissipation.Therefore in present energy deficiency, be difficult to guarantee under the situation of the required ature of coal coal of the boiler source of goods, how overheavy firing effect, coke-knocking descaling reduces smoke-discharging pollution, improves thermo-efficiency, is the task of top priority in fact.The ignition dope of domestic and foreign literature report, the coke-knocking descaling agent, though sweetening agent etc. are various in style, practical application is all undesirable.As Japanese Patent JP58164696(1983) disclosed a kind of additive for fire coal, it is to be mixed and made into by silicon-dioxide, diatomite, magnesium oxide and ferric oxide, complex manufacturing, the cost height uses enterprise to be difficult to bear.Chinese patent CN 87101187.5(1987) a kind of additive of Gong Buing is by charcoal element, sulfur flour, aluminium powder, ammonium nitrate etc. are made, what CN 90106347.9(1990) announce is by potassium permanganate, potassium oxide, SODIUMNITRATE etc. are made, what CN 89105697.1(1989) announce is by gac, the plain powder of charcoal, alum, magnesium oxide, ferric oxide etc. are made, though cost is low, but because metal-salt content is low in the major ingredient, to safety, combustion-supporting, decoking, pollution treatment dye, reduction is corroded etc., and effect is not all attained ideal.

For this reason, the object of the invention provides a kind of roasting kiln efficient combustion-supporting, and coke-knocking descaling reduces harmful gas emission, slows down corrosion and energy-conservation additive, safety easy to use, and shelf-stable.

The present invention is a kind of roasting kiln efficient combustion-supporting, and coke-knocking descaling reduces dusty gas discharging and energy-conservation additive, the composition that it is made up of following each component.

Component weight (%)

Saltpetre SODIUMNITRATE complex compound (KNO ₃NaNO ₃) 1-20

Yellow soda ash (or salt of wormwood) 31-49

Sodium-chlor (or Repone K) 20-56

γ-ferric oxide 1-5

Aluminum oxide 1-3

Silicon oxide 1-4

Magnesium oxide 1-8

Calcium oxide 1-8

The manufacturing of compositions of additives of the present invention is to carry out according to a conventional method, and technology is easy, and cost is low.At first with the each component raw material drying, by mechanical disintegration, prepare burden by proportioning more respectively, after stirring is mixed, screen, getting particle diameter is the shallow river look pressed powder of 0.12-0.45 millimeter, is the product additive.Product is non-explosive type pressed powder, safety, and storage root of Dahurian angelica stability is high, is stored in 0-40 ℃ of relative humidity less than in 93 ± 0.5% hermetically sealed packing bags, and weather resistance reaches 2 years mass conservations storage period.

Component saltpetre SODIUMNITRATE complex compound (KNO in the compositions of additives of the present invention ₃NaNO ₃) be ignition dope, can make coal seam burning by different level in burner hearth, along with the progressively rising of coal seam temperature, can remedy the air capacity deficiency in the stove, impel burning perfect, make inflammable gas, semicoke and char combustion in suspension carbon granules and the coal seam are complete.Yellow soda ash (or salt of wormwood) is sulphur-fixing agent, have desulfuration and remove cigarette ash coking and absorption acidic oxide function, weaken bonding force with the furnace wall contact surface, make burnt layer ash bed be easy to loose powderyization, impel the burnt dirt of slagging scorification to come off, and can be with the dusty gas carbon monoxide, various sulfur oxides and nitrogen oxide are fixed, make it to discharge, thereby reduce its quantity discharged greatly, the corrosion that has also slowed down roasting kiln with slag.Sodium-chlor (or Repone K) and γ-ferric oxide are the loose properties-correcting agent of cigarette ash coking, in the ash-cleaning and coke-removing of boiler, destroy burnt molecular structure, make established hard coking, loose modification comes off, and help the stability of ignition dope, make product of the present invention use, store and transportation on guarantee safety.Component oxide γ-ferric oxide, silicon oxide, aluminum oxide, magnesium oxide and calcium oxide have the effect that oxidation is combustion-supporting and the high-temp combustion delay is stable.

Because the rational formula that compositions of additives of the present invention has adopted above-mentioned each component to form, therefore has efficient combustion-supporting, coke-knocking descaling, reduce multiple functions such as harmful gas emission, be applicable to the various roasting kilns of burning lumped coal, powder coal or oil, safety easy to use, its superiority is fairly obvious, be in particular in following some:

1. combustion-supporting additive of the present invention has tar and the combustion-supporting effect of low grade coal.Because oxygenation effect, make the carbon part ratio of combustion in tar and the low grade coal more complete, cause aflame carbon and hydrocarbons residual particles to reduce, make the ash content component trend standard in the slag, ash melting point reduces, slag adhesion slagging scorification situation makes moderate progress, and molten Jie's degree of ashes also can correspondingly improve simultaneously, helps environment protection treating.

2. after coke-knocking descaling drops into additive in roasting kiln, not only can avoid newborn cigarette ash coking and fouling to produce, and the hard decoking incrustation of not removing for a long time can make it progressively come off using additive of the present invention after 25 days.Because features high scale-removing effect has also reduced the blowing out cycle, reduces fireman's labour intensity greatly.

3. energy-conservation owing to removed low burnt dirt (the burnt dirty thermal conductivity: metallic thermal conductivity=0.025: 1), directly improve burning thermal conductance efficient, thermosteresis is reduced of thermal conductivity, thereby saved the energy, boiler unit's steam consumption of coal is lowered, and industrial furnace can be saved 5-17%, and powder coal stove can be saved 1-3%.

4. reduction harmful gas emission, additive can make harmful dusty gas quantity discharged that roasting kiln discharges from 158-228mg/KM ³-STD is reduced to 100mg/KM ³-STD has reduced environmental pollution.Also slowed down the corrosion of roasting kiln, reduced corrosion rate and can reach about 45%, prolong the work-ing life of roasting kiln greatly.

5. not only production technique is simple and easy for additive of the present invention easy to use, and cost is low, and consumption is few, and safety easy to use is respond well.Only need in fuel, to add 2/10000ths additive of the present invention, the old dirt of old Jiao of burner hearth furnace wall can be removed totally, use ten thousand afterwards/ maintenance dose, can avoid new burnt dirt knot long-pending.Additive evenly can be spread on coal-fired surface or its solution be sprinkled upon on the feeding web of coal dust.Additive of the present invention or its solution can be sprayed in the burner hearth with spray gun oil-firing boiler and to get final product.

The present invention further sets forth by following examples, but does not place restrictions on scope of the present invention.

Embodiment 1-6

With the each component drying, make water content less than 5%, pass through mechanical disintegration more respectively, make particle diameter reach the 0.12-0.45 millimeter, prepare burden, after stirring is mixed by the proportioning of following each embodiment, screen, getting particle diameter is the light red pressed powder additive product of 0.12-0.45 millimeter.

Component	Weight %
								Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5	Embodiment 6
Saltpetre SODIUMNITRATE complex compound (KNO 3·NaNO 3)	1	5.5	3	10.5	20	11
							Yellow soda ash (or salt of wormwood)	32	41.5	36.5	31	47	49
Sodium-chlor (or Repone K)	56	25	41.5	47.5	23	20
							γ-jeweler's rouge	1	5	3	1	2	1
Aluminum oxide	1	3	2	1	1	1
							Silicon oxide	1	4	2	1	4	2
Magnesium oxide	4	8	6	4	2	8
							Calcium oxide	4	8	6	4	1	8

The additive product of embodiment 1-3 is applicable to lumped coal roasting kiln (industrial furnace).The additive product of embodiment 4-6 is applicable to the powder coal roasting kiln.

Claims (2)

1, a kind of roasting kiln efficient combustion-supporting, coke-knocking descaling reduces dusty gas discharging and energy-conservation compositions of additives, it is characterized in that said composition is made up of following each component:

Component weight (%)

Saltpetre SODIUMNITRATE complex compound (KNO ₃NaNO ₃) 1-20

Yellow soda ash (or salt of wormwood) 31-49

Sodium-chlor (or Repone K) 20-56

γ-ferric oxide 1-5

Aluminum oxide 1-3

Silicon oxide 1-4

Magnesium oxide 1-8

Calcium oxide 1-8

2, compositions of additives as claimed in claim 1 is characterized in that said composition is to have the pressed powder that particle diameter is the 0.12-0.45 millimeter.