Method for reduction of hazardous emissions from burners with flame combustion

FIELD: oil and gas industry.

SUBSTANCE: invention is related to method for reduction of hazardous emissions from burners with flame combustion that includes supply of absorbent to burner and collection of used absorbent; the method is distinguished by absorbent delivery into flue gases formed in the post-flame area in quantity of 5-7% of fuel consumption.

EFFECT: reduction of hazardous emissions into atmosphere, in particular sulphur oxides, and improvement of operating economy and reliability of a boiler unit.

1 cl, 1 ex

 

The invention relates to methods of gas purification from harmful substances generated by the combustion of solid and liquid and gaseous fuels.

There is a method of reducing harmful emissions generated by the combustion of fuel, including the supply of natural zeolites (clinoptilolite composition (Na2K2)·O·Al2O3·10SiO2·8H2O) inside the boiler is mixed with the fuel before combustion (see RF patent №2057165, IPC C10L 9/10, C10L 10/00, publ. 27.03.1996).

Closest to the claimed method is the reduction of harmful emissions from the combustion of coal in furnaces fluidized bed, in which the coal is burned together with pre-loaded with an inert material such as sand or clay, with the addition of natural zeolite as an additive to reduce harmful emissions, including sulfur oxides (see RF patent №2421505, IPC C10L 10/00, publ. 20.06.2011, bull. No. 17).

The disadvantages of the known ways of reducing harmful emissions is the high consumption of the adsorbent, as well as reducing the efficiency of the boiler unit because of the increased ballast fuel by adding additives.

The technical result of the invention is to reduce emissions of harmful substances, in particular oxides of sulfur, as well as improving the efficiency and reliability of the boiler unit.

The result of the temperature is raised to those the way to reduce harmful emissions from furnaces with flaring fuel combustion, including the filing of the adsorbent in the furnace and collect the spent adsorbent, characterized in that the flow of the adsorbent produced in the flue gases formed in polaramine zone of the boiler, at the rate of 5-7% of fuel consumption.

The essence of the proposed method lies in the fact that produce a continuous supply of sorbent in the flue gases formed in polaramine zone of the boiler, at the rate of 5-7% of fuel consumption.

During operation of the boiler produces a continuous supply of adsorbent (natural zeolites, alumina, ash) in the flue gases formed in polaramine zone of the boiler, using, for example, devices, systems blasting surfaces or direct its blowing in the surge shaft of the boiler, as well as through devices listed systems will collect the spent sorbent and the output from the cycle gas purification.

Due to the absorption of shares contained in flue gases vapors of sulfuric acid (H2SO4simultaneously with the decrease in the concentration of SO2and SO3in the combustion products is reduced to the dew point temperature of the flue gases. When this becomes possible boiler unit with deeper cooling of the combustion products at the exit, which improves the reliability of the air the heater (there is a decrease probable corrosion rate in the zone temperatures of 80-120°C). In addition, lowering the dew point temperature of the flue gases in real conditions can improve the efficiency of the boiler in comparison with the work normally (without using the proposed technology).

During the continuous feed of the adsorbent in the flue gases formed in polaramine zone and passing through the surge shaft of the boiler, creating optimal thermal conditions for the adsorbents of harmful emissions and becomes more prolonged contact of the adsorbent with the combustion products. In terms of the proposed method of reducing harmful emissions from furnaces with flaring fuel combustion may use different dry adsorbents such as natural zeolites, alumina, ash. It does not reduce the temperature of the flue gas at the furnace outlet, therefore, is not disturbed nominal (basic) mode of operation of the boiler.

The method is as follows.

After starting the boiler up to operating parameters to produce a continuous supply of adsorbent (natural zeolite, fly ash, alumina) in the flue gases formed in polaramine zone of the boiler, the optimal number of which in the particular case of the use of any particular adsorbent is determined from the condition of the economic minimum costs related to the implementation of the method:

{bopt=limf(And)AndminAnd=f(And1)+f(And2)+f(And3)+C

where bopt- optimal conditions techno-economic assessment of the relative consumption of the adsorbent;

And the total cost method, RUR/year;

f(And1- fuel costs;

f(And2) - the cost of the adsorbent is supplied into the convective mine boiler;

f(And3) - payment for emissions of sulfur oxides, which depends on the amount of adsorbent;

Listed components of the total costs are a function of the flow rate of the adsorbent;

With operating costs.

Example. The boiler BKZ-220-F with flare combustion carbon was used Kharanorskaya field (Qnp12MJ/kg (2000 kcal/kg), WR≈40%, AR≈8,6%, SR=0,3%). Flue gases has been cleaned from harmful emissions with nature is underwater zeolite (clinoptilolite composition (Na 2K2)·O·Al2O3·10SiO2·SH2O), which were submitted in convective mine through the system for shot blast cleaning of heating surfaces. Consumption of natural zeolites were maintained at 5% of estimated fuel consumption at nominal mode of operation of the boiler.

The result was a reduction of total emission of sulphur oxides by 49% (from 149,2 g/s to 76.5 g/s), increasing the efficiency gross boiler by 0.83% (90,87% to 91.7%), reducing the fuel consumption of 0.15 kg/s (16,21 kg/s to 16.06 kg/s), reducing the flue gas temperature at 13°C (159°C to 146°C).

Thus, we can conclude that the invention allows to reduce the emissions of sulfur oxides on boilers burning solid and liquid and gaseous fuels, as well as to improve the reliability and efficiency of the boiler by reducing the cost of cleaning and boiler operation due to reduced spending on zeolites and fuel.

The way to reduce harmful emissions from furnaces with flaring fuel combustion, including the filing of the adsorbent in the furnace and collect the spent adsorbent, characterized in that the flow of the adsorbent produced in the flue gases formed in polaramine zone of the boiler, at the rate of 5-7% of fuel consumption.



 

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2 cl, 3 dwg, 1 tbl, 1 ex

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1 cl, 25 ex, 2 tbl

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2 tbl, 1 ex

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5 tbl, 2 ex

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2 tbl

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2 tbl

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11 cl, 7 tbl, 11 ex

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11 cl, 7 tbl, 11 ex

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2 cl, 5 ex, 1 tbl, 4 dwg

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13 cl, 1 dwg, 7 tbl, 9 ex

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13 cl, 1 dwg, 7 tbl, 9 ex

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12 cl, 6 tbl, 12 ex

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12 cl, 6 tbl, 12 ex

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1 cl, 1 ex, 1 tbl

FIELD: chemistry.

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11 cl, 4 tbl, 6 ex

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil producing and processing industry. The invention is related to the method for reduction of vapour pressure by introduction into oil of 9-11 mg/kg of an additive representing CnH2n+1COONa, where n=10-16. The additive is introduced singly at 6-10 subsequent fillings of the tank.

EFFECT: reduction of vapour pressure.

2 tbl

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