Method of combustion of a hydrocarbon fuel in a burner

FIELD: methods of combustion of hydrocarbon fuels.

SUBSTANCE: the invention is dealt with the method of combustion of a hydrocarbon fuel in a burner. The method of combustion of hydrocarbon fuel in a burner provides, that along the burner external surface a non-corroding technical atmosphere is set in motion, chosen from a group including steam, CO 2 , nitrogen or their mixture. In the capacity of the non-corroding technical aerosphere they use steam. Combustion is carried out at the presence of steam. At least a part of the non-corroding aerosphere is added to the hydrocarbon fuel. The non-corroding aerosphere is used in an amount sufficient to dilute or replace a corroding technical aerosphere existing around the external surface of the burner. The invention allows to avoid a corrosive spraying of the metal and carbonization of the industrial burners exposed to action of the corroding technical aerosphere.

EFFECT: the invention allows to prevent a corrosive spraying of the metal and carbonization of the industrial burners.

5 cl, 1 dwg

 

The present invention relates to fuel combustion, particularly to method and burner for burning a hydrocarbon fuel with the oxidizer.

Hydrocarbon fuel is usually used in the chemical industry for inciting industrial furnaces and heaters to supply heat for carrying out reactions that require heat in the reaction vessel, equipped with appropriate burners.

The main disadvantage of the known burners is damage to the front surface of the burner at high speeds the fuel gas required for industrial burners and metal sputtering caused by correlating the atmosphere in which the surface of the burner at high temperatures.

A known method of burning a hydrocarbon fuel in the burner, which is that the combustion is carried out in the conditions, mainly to prevent damage to the front surface of the burner caused by the hot products of combustion. These conditions have created a special design of the front surface burner (see U.S. patent 5496170, international class F 23 7/00, 1996).

The present invention is to prevent corrosion spray metal and inaugurazione industrial burners exposed to corrosive atmosphere.

This problem is solved by the proposed method of burning hydrocarbon is opleve in the burner, characterized in that along the outer surface of the burner pass non-corroding cast an atmosphere selected from the group comprising water vapor, CO2, nitrogen or a mixture.

Suitable non-corroding cast atmosphere will be any gaseous medium which does not cause corrosion reactions spraying metal or inaugurazione on metal surfaces at elevated temperatures.

Preferred is a method in which as a non-corroding cast of the atmosphere using water vapor.

In addition, preferably, if the combustion is carried out in the presence of water vapor.

Also preferably, when at least part of non-corroding cast of the atmosphere is added to the hydrocarbon fuel.

In addition, preferred is a method in which non-corroding cast atmosphere used in sufficient quantity to dilute or replace the corrosive atmosphere around the outer surface of the burner.

The above problem is solved by the use of the proposed burner for burning a hydrocarbon fuel with an oxidant containing the external metal surfaces of the passages for fuel and oxidizer nozzle for burning fuel with the oxidizer, and the burner is characterized by the fact that it contains located separately concentric wall, surrounding, p is at least part of its external metal surface, and adapted to enter and to pass non-corroding cast atmosphere along the outer metallic surface.

When operating above the burner in the reactor, this wall may be formed of a reflective cladding material in the upper part of the reactor, the outer surface of the burner to a suitable distance and thereby creating a passage for the introduction and transmission of non-corroding cast of the atmosphere during operation of the burner.

The following description shows in detail a specific way of carrying out the invention with reference to the drawing, which shows a view in section of a burner according to the invention, mounted in the upper part of the refractory lining of the reactor.

Burner 1 having an external surface with a cylindrical metal upper surface 2 and a conical metal nozzle 3, is mounted in the upper part of the reactor 4. The annular space 5 between the upper surface 2 and a part of the nozzle 3 is formed between the surface of the burner and refractory lining 6 in the upper part of the burner 2. Through the annular space 5 is passed non-corroding cast atmosphere along the upper surface 2 and is directed to the nozzle 3. Non-corroding cast atmosphere flowing through the annular space 5, protects EXT is th surface from the correlated atmospheric combustion and prevents the reaction of nagarajuna or corrosion spraying metal on the surface, caused by atmosphere combustion. The path of passage for supplying fuel and oxidant are not shown.

Example.

In the pilot unit autothermal reformer (ATR) have different ways of implementing the method according to the present invention using the burner type disclosed in the above U.S. patent No. 5496170. The burner is protected from sputtering metal on the outer wall of the burner flow of water vapor, the current in the sleeve surrounding the burner. External burner nozzle made of alloy, which, as was shown in preliminary experiments, corrosion is affected by metal sputtering without the presence of protective flux of water vapor from the outside. At the same time, the description of individual burners in relation to soot checked by determination of the critical temperature for the particular relationship of water vapor to carbon (S/C). In each experiment to determine the critical temperature by gradually lowering the temperature at the reactor outlet (Toutlet) until then, until you exceed the limit of education say. In addition, this value is determined for the burner without a protective flow of steam at the other identical conditions, i.e. the input stream, the operating pressure and the ratio of water vapor to carbon. The ratio of water vapor to carbon (S/C) determine Kakuma only supplied water vapor in moles, divided by the sum of the hydrocarbons in moles of carbon atoms (C1). Pilot plant used in the above experiments, contains aggregates to provide a multitude of threads reactor ATR reactor ATP and equipment for further processing of the received gas.

The feed streams consist of natural gas, water vapor, oxygen, and hydrogen. All gases compressed to the working pressure and pre-heated to operating temperature. The average composition of natural gas is given in table 1. Natural gas disulfiram before introduction into the reactor APR. The feed streams are combined into three streams and fed into the burner APR. First the feed stream of natural gas, hydrogen and water vapor is heated to a temperature of about 500°C.

The second feed stream containing oxygen and steam, heated to a temperature between 200°and 220°C. a Third feed stream, consisting only of water vapor, heat up to 450°C.

In the reactor ATP spend substochiometric burning and subsequent reaction of catalytic reforming with water vapor and conversion. The compositions of the incoming and outgoing gases are analyzed by gas chromatography. The resulting gas is in equilibrium with respect to reactions of reforming and conversion. Below reactor ATP in the course of flow of the working gas is cooled, and the main part of the water vapor, contained in the formed gas is condensed.

Table 1
ComponentThe mole fraction, %
N20,45
CO21,20
CH495,36
With22,22
With30,45
With40,23
With50,08

Conduct two experiments using the burner, made from industrial alloy Haynes-230. This alloy is previously have without a protective flow of water vapor on the outer wall of the burner if operating conditions with respect to water vapor to the carbon of 0.35 and 0.6, resulting in the outer side of the burner is subjected to sputtering of the metal after approximately 155 hours. Appropriate working conditions in the experiments with the protection of water vapor according to the invention are shown in table 2.

The above type of burner test limit values soot without the presence of steam in the steam sleeve control experiments "SP S/C 0,60 cont." and "SP S/C of 0.35 pin.", given in table 3. Then examine the limit soot, when a certain part of the water vapor is passed through pairs of the howling of the sleeve along the outer wall of the burner. Working conditions during the experiment on the formation of soot are shown in table 3, together with a critical temperature (Tcrit.)e characterizing the soot on the burner.

Table 2
ExperimentNature. gas,

m3/h

when

N.U.
H2,

m3/h

when

N.U.
S/CWater. couples

the sleeve

m3/h at

N.U.
Poutput.,

bar

excess.
Toutlet,

°
Tinput 1,

°
Tinput 2

°
Time

stream

h
Mol. Rel. S/C 0,601002,00,605,027,51020500220163
Mol. Rel. S/C 0,351002,00,353,527,51020499222183

Experiments on metal sputtering is performed at a ratio of water vapor to carbon (S/C) of 0.60 mol. Rel. S/C to 0.60 and 0.35 mol. Rel. S/C of 0.35), respectively. Operating conditions are given in the table, where Tinput 1and Tinput 2- temperature at the inlet of the first and W is cerned fed streams, respectively, and Toutletand Routletthe temperature and pressure of the gas leaving the reactor under conditions in which the reaction of reforming with water vapor and conversion are in balance.

After every experiment, the burner is removed from the reactor ATP for review. At the same time as the burner without a protective flow of water vapor on the outer wall is detected by the surface area exposed to corrosion by spraying metal on the outer surface of the gas nozzle, the outer nozzle burners with a protective water vapor does not show signs of corrosion spraying metal on the outer surface.

200
Table 3
ExperimentsNature. gas,

m3/h at N.U.
H2,

m3/h at N.U.
S/CPoutput., bar excess.Pcrit.,

°
Tinput 1,

°
Tinput 2,

°
Water. pairs in the sleeve,

m3/h at N.U.
SP S/C 0,60 pin.1002,00,6027,5950-960500220About
SP S/C of 0.35 pin.1002,00,3527,5987-9885000
SP S/C 0,60

#1
1002,00,6027,5947-9524991965,0
SP S/C 0,60

#2
1002,00,6027,5947-95150322012
SP S/C 0,35

#1
1002,00,3527,59864992193,5
SP S/C 0,35

#2
1002,00,3527,598748920512
Working conditions and the critical temperature (Tcritfor experiments on the formation of soot (OS), including control experiments without steam in the steam sleeve.

To investigate the formation of soot on the burner, conduct four experiments to determine the critical temperature (Tcrit.for the flow of steam in the steam sleeve. These four experiment is carried out with respect to water vapor - carbon of 0.60 and 0.35, as shown in table 3, which also shows the critical temperature (Tcrit.). Change the flow rate of water vapor in the sleeve, as well as the flow of water vapor in the ground under the by the stream, in order to maintain a constant total flow rate of the water vapor in the process. The results are compared with results for the burners of the same type operated without steam sleeve (control experiments). There were no significant differences. Thus, consumption of steam in the steam sleeve on the outside of the burner in an amount corresponding 8-35% of the total amount of water vapor introduced into the process, does not affect the operation of the burner in relation to soot.

1. A method of burning a hydrocarbon fuel in the burner, characterized in that along the outer surface of the burner pass non-corroding cast an atmosphere selected from the group comprising water vapor, CO2, nitrogen or a mixture.

2. The method according to claim 1, characterized in that as a non-corroding cast of the atmosphere using water vapor.

3. The method according to claim 1, characterized in that the combustion is carried out in the presence of water vapor.

4. The method according to claim 1, characterized in that at least part of non-corroding cast of the atmosphere is added to the hydrocarbon fuel.

5. The method according to any one of claims 1 to 4, characterized in that the non-corroding cast atmosphere used in sufficient quantity to dilute or replace the corrosive atmosphere around the outer surface of the burner.



 

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