JPS61250416A - Combustion method for solid petroleum residue - Google Patents

Abstract

PURPOSE:To control slagging trouble during combustion, by supplying and burning slagging inhibitors including specific compounds as effective components together with solid petroleum residue (SPR). CONSTITUTION:Slagging inhibitors including, as effective components, one or more than one kind out of compounds of Ca, Mg, Al, Si and Fe, are fed to a boiler together with SPR and burnt. The mixture ratio of the slagging inhibi tor to SPR is within a range of 0.01-0.5wt%, preferably, 0.03-0.1wt%. Slagging inhibitors, being in the form of powder or in the form of water slurry dispersed therein or water solution dissolved therein, or, if safety permits, in the form of oil slurry or oil solution, are added to SPR, mixed therewith and used for boiler combustion. By this, slagging during combustion is effectively controlled and troubles of reduction of operation due to the contamination inside the boiler is improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for burning solid petroleum residue (hereinafter abbreviated as SPR) for fuel, and more specifically, to a method for suppressing slagging problems during combustion of SPR. This is the purpose.

In the present invention, SPR refers to petroleum distillation residues that are solid at room temperature, such as petroleum pitch, petroleum coke,
Indicates asphalt, etc.

(Conventional technology) SPR has been attracting attention as a boiler fuel in recent years, but
When used as a fuel, there are many problems that must be solved, such as poor combustion, fouling inside the furnace, and an increase in unburned matter.

Among these, the most serious problem with SPR combustion is that slagging occurs during combustion, which fouls the inside of the furnace, leading to a situation where the operation has to be shortened.

(Problems to be Solved by the Invention) In order to solve the above-mentioned problem of shortened operation due to contamination inside the furnace during SPR combustion, there are solutions such as increasing the capacity of the furnace or widening the spacing between the water pipes. Both options are being considered, but they all have the drawback of being too expensive.

Another possible solution is to inject a slagging inhibitor into the combustion atmosphere during SPR combustion, but no slagging inhibitor suitable for SPH has been found so far.

Therefore, an object of the present invention is to find a slagging inhibitor suitable for SPH and to use this to suppress slagging problems during combustion of SPR.

(Means for Solving the Problem) In order to solve the above object, the inventors of the present application conducted intensive research and found that Ca, Mg, Al* S<, l
It was discovered that the compound 'g is a suitable slagging agent for SPH, and a combustion method for SPH using this compound was completed.

That is, in this invention, when SPR is burned in a boiler, Ca, Mg, kl p S S
A slagging suppressant containing one or more compounds of + F g as an active ingredient is supplied to a boiler and combustion is performed.

Slagging inhibitors used in the invention include inorganic silica compounds, organic silica compounds, inorganic calcium compounds, inorganic magnesium compounds, inorganic aluminum compounds,
They are inorganic iron compounds, organic calcium compounds, organic magnesium compounds, organic aluminum compounds, and organic iron compounds.

Specifically, for example, M(j”Os t MIF(OH)
* r C(LCOm rCa (OH)x + F
#t01 j Fe*O+ + FgO(OH),
kl (OH)i ) MQOrM*Os r Cα0
'r szo, l Calcium maleate, Magnesium malate, Magnesium citrate.

Magnesium succinate, iron malate, iron cono-phosphate, iron benzoate, aluminum malate, aluminum cono-phosphate, aluminum acetate, calcium benzoate, magnesium benzoate, magnesium salicylate, calcium acetate, magnesium acetate, 2Na @O・sis, ,
5ffl(OCHs)a, etc.

The mixing ratio of slagging inhibitor is 0.0 to SPR.
1-0.5% by weight, preferably 0.03-0.1% by weight
Used within the range of

If the mixing ratio is less than 0.01 weight, the slagging suppression effect will not be sufficient, and if it is more than 0.5 weight, the disadvantage is that the ash content during combustion will be extremely increased, which is not preferable.

The slagging inhibitor used in this invention may be in the form of a powder, an aqueous slurry dispersed in water, an aqueous solution dissolved in water, or an oil slurry or solution when safely punched. It is added to SPH, mixed and used for boiler combustion.

In the combustion of SPH, careful attention is paid to moisture content, which affects combustion efficiency, but when adding the slagging inhibitor in powder form as described above, there is no moisture introduced.
It has the advantage that the active ingredient can be injected as is.

When added as a powder, examples of slagging inhibitors include silica compounds, MUCOs, Mg (OH'')
l.

CaCO3, Cc (OH)z p TexOs r
Fas 04p Feo (OH)p Al (O
H) s rAltOs, MgO, CcLO, ? Calcium oleate, magnesium malate, magnesium citrate, magnesium succinate, iron malate, iron succinate.

1 or 2 f of iron benzoate, aluminum malate, aluminum succinate, albanium acetate, calcium benzoate, magnesium benzoate, magnesium salicylate, calcium acetate, magnesium acetate! ! The above are used.

In addition, when adding as a water slurry, some moisture may be brought in, but it is easy to handle and has high quantitative properties.
1. Furthermore, when the slagging inhibitor is added as an aqueous solution, it is the most chemically stable and the easiest to handle. The effect is the same as in the case of slurry 〇 above.

In addition, when adding as an aqueous slurry or an aqueous solution, an aqueous slurry or an aqueous solution of one or more of the above compounds is used.

The above-mentioned slagging inhibitor is injected into, for example, a fuel SPR line, and is sprayed together with the SPR into a boiler for combustion.

The slagging suppressant may be added at any position as long as it is sufficiently mixed with the SPR, but by injecting it before the SPR grinding mill, the SPR can be pulverized efficiently.

Specifically, for example, a predetermined amount of SPRK for fuel is quantitatively added using a powder injector or a metering pump provided at the inlet of the grinding mill, and the fuel SPRK is used for combustion.

Furthermore, as a method of supplying the slagging inhibitor to the boiler together with the SPR, the slugging inhibitor may be directly supplied to the boiler separately from the SPR so that the mixing ratio is as described above.

(Effect of the invention) In the combustion of SPH, Nα contained in SPH,
V, S, etc. form low melting point substances during combustion, which is a cause of slagging problems, but as in this invention, S
1 of the compounds Ctz, Mg, kl, Si, Fa in PR
When a slagging inhibitor consisting of a species or two or more species is added and combustion is performed, S, V, Nα, etc. and the compounds constituting the slagging agent combine to form a compound with a high melting point. Makes it harmless and suppresses slugging.

In addition, the slagging inhibitor used in this invention has a remarkable effect of softening the ash, and the ash, etc. once attached to the boiler wall surface, etc., is changed into a state that is easy to detach, and this also suppresses slagging.

Therefore, according to the present invention, slagging during combustion is effectively suppressed, and the problem of shortening operation due to dirt inside the furnace is improved.

On the other hand, according to the present invention, when the above-mentioned slugging inhibitor is added to the inlet of the SPR pulverizing nozzle, the slagging inhibitor also has the effect as a pulverizing aid in the pulverizing mill, and therefore the pulverizing efficiency of the SPH increases. This makes SPR fine particles, which effectively solves the problems of clogging of the powder line, deterioration of combustibility, dirt in the furnace, and remaining unburned matter.

(Example) Examples of this invention will be shown below.

Petroleum coke was used as SPR, and predetermined amounts of various slagging inhibitors were added, and ashing treatment was performed once at 600° C. for 20 hours, and the remaining ash was used to form 3 x 3 cubes. The melting properties of this cube were measured using a high temperature heating microscope manufactured by Ern5tLgitz.

The results are shown in Table 1.

Conventionally, it has been known that compounds such as F, , C, and Mσ lower the melting point of coal ash, but for petroleum coke, as is clear from Table 1, the slagging inhibitor according to the present invention has been added. The melting point obtained by combustion was effectively increased, and the formation of slag on the furnace wall was suppressed, and the peelability of the generated slag was improved, making it clear that it had a slagging suppressing effect. .

Claims (1)

[Claims] When solid petroleum residue is burned in a boiler, a slugging inhibitor containing one or more of Ca, Mg, Al, Si, and Fe compounds as an active ingredient is supplied to the boiler together with the solid petroleum residue. A method of burning solid petroleum residue.