RU2480673C1 - Device for fuel burning - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: device for fuel burning includes central and peripheral air channels with swirlers arranged in a cylindrical body, the main and additional headers, rotary gas-dispensing tubes, installed on a circumference between air channels. Outlet holes of some tubes are arranged tangentially, and of the other ones - radially to the axis of the device, along the device axis there is additionally a central channel of gas supply installed, at the same time the ratio of the area of outlet holes of the central channel of gas supply to the total area of gas outlet holes of rotary gas dispensing tubes and central channel of gas supply

makes 0.1-0.4. Gas-dispensing tubes are connected with the main header, and the central channel of gas supply - with an additional header.

EFFECT: invention makes it possible to reduce content of nitrogen oxides in combustion products and provide for stable operation of a device in a range of control of thermal capacity of a device and safe mode of equipment operation in general.

2 dwg

Description

The invention relates to the field of energy and can be used for burning gaseous fuels, as well as in the chemical, petrochemical and other industries.

A device containing a combustion chamber, burners located in two tiers, and nozzles of sharp blasting of tiers are known. The method of burning fuel is carried out by mixing it with part of the air, creating a vertical flame and supplying the rest of the air in the form of several air jets dispersed over the height of the furnace, in which, in order to reduce the concentration of nitrogen oxides in the combustion products, the air flow in each jet is set higher than the previous one and the flow rate in the upper stream is supported by at least half of the total air flow rate in the streams (SU 1456699, IPC: F23C 7/00, published 07.02.89).

The disadvantage of this method of combustion is that for its implementation it is necessary to have sufficient dimensions of the furnace space (the height of the furnace) to accommodate elements of the fuel combustion system, which is not always possible in practice, especially when reconstructing existing equipment.

The closest to the claimed invention in technical essence and the achieved result is a device for burning gaseous fuels, comprising central and peripheral air channels with swirls located in the housing, a collector and rotary gas-distributing tubes installed on the circumference between the air channels, and the outlet openings of the tube part are located tangentially, and the rest - radially to the axis of the device, while additionally installed a second collector, the ratio of the diameter of the circle, on which the gas distribution tubes are located, the inner diameter of the burner body is 0.45-0.7, the ratio of the total areas of the tangential and radial openings is 0.5-1.0, while the gas distribution tubes with tangential and radial outlet openings are connected to different collectors (RU 2076271, IPC: F23D 14/24 published on 03/27/1997).

The disadvantage of the known device adopted for the prototype, as well as the reason that impedes the achievement of the desired technical result when using the aforementioned known device, is that in case of deep unloading of equipment to ensure gas pressure not lower than the alarm setpoint, it is necessary to disconnect some of the devices. The measure is necessary and necessary to ensure safe operation of the equipment.

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information, as well as identification of sources containing information about analogues of the claimed invention, allowed to establish that the applicant did not find a technical solution characterized by signs identical or equivalent to those proposed.

The determination from the list of identified analogues of the prototype as the closest technical solution for the totality of features made it possible to identify in the claimed device a combination of significant distinctive features in relation to the technical result perceived by the applicant, as set forth in the following claims.

Therefore, the claimed invention meets the patentability criterion of "novelty."

To verify the conformity of the claimed invention with the condition “inventive step”, the applicant conducted an additional search of solutions known from the prior art. The search results showed that the present invention does not follow in a manner explicit to the expert from the prior art and determined by the applicant.

The claimed technical device allows to obtain a deeper level of reduction of the content of nitrogen oxides in the combustion products and to ensure stable operation of the device in the range of regulation of the thermal power of the device from 10% to 100% and safe operation of the equipment as a whole. The presence of rotary gas distribution tubes in combination with a central gas supply channel additionally installed along the device axis and made of two coaxial pipes with a conical nozzle with gas outlet openings, and the ratio of the area of gas outlet openings of the central gas supply channel to the total total area of gas outlet openings of the rotary gas distribution pipes gas supply

составляет 0,1-0,4, позволяет получить более глубокое снижение концентрации окислов азота в продуктах сгорания за счет обогащения центральной зоны топливом, создавая на начальном участке факела условия смешения с избытком газа, что в свою очередь приводит к горению смеси с пониженной температурой и с пониженным образованием оксидов азота, и обеспечить безопасную работу оборудования в диапазоне регулирования тепловой мощности устройства от 10% до 100%. Устойчивость работы предлагаемого устройства обеспечивается за счет того, что газовые струи центральной подачи газа распределяются в воздушном потоке на границе зоны обратных токов со скоростями воздуха, близкими к нулю.

is 0.1-0.4, it allows to obtain a deeper decrease in the concentration of nitrogen oxides in the combustion products due to the enrichment of the central zone with fuel, creating mixing conditions with an excess of gas in the initial section of the flare, which in turn leads to combustion of the mixture at a lower temperature and with reduced formation of nitrogen oxides, and to ensure safe operation of the equipment in the range of regulation of the thermal power of the device from 10% to 100%. The stability of the proposed device is provided due to the fact that the gas jets of the central gas supply are distributed in the air stream at the boundary of the reverse current zone with air velocities close to zero.

The device for burning fuel includes a cylindrical body, central and peripheral air channels with swirls, rotary gas distribution tubes mounted on a circle between the air channels, with the outlet openings of the tubes parting tangentially and the rest radially to the axis of the device, a central channel is additionally installed along the axis of the device gas supply, and the ratio of the area of the outlet openings of the Central gas supply channel to the total total area of the gas outlet rotary g azo tubes and a central gas supply channel

составляет 0,1-0,4, кроме того, газораздающие трубки соединены с основным коллектором, а центральный канал подачи газа - с дополнительным коллектором.

is 0.1-0.4, in addition, the gas distribution tubes are connected to the main manifold, and the central gas supply channel to the additional manifold.

Figure 1 shows a General view of a device for burning fuel;

figure 2 shows a diagram of the direction of the gas jets relative to the cross section of the Central jet.

The device for burning fuel contains a cylindrical body 1, central 2 and peripheral 3 air channels with swirls 4,5, a gate 6 for distributing air between channels 2 and 3, rotary gas distribution tubes 7, the openings of which are located tangentially and radially to the axis of the air channel, connected to the main manifold 8, the Central gas supply channel 9, mounted along the axis of the burner and connected to an additional manifold 10.

The device operates as follows.

The air enters in a single stream through the central air channel 2, where it is twisted by means of a swirler 4, forming a swirling stream. Gaseous fuel is supplied to the gas distribution tubes 7 through the manifold 8 and the central gas channel 9 through the manifold 10, which is mixed with the air supplied through the central air channel 2 and ignited by an ignition device (not shown). Since the resulting gas-air mixture has an excess of gas, not all gas, but part of it, burns out in the initial section of the flare. Unburned gas is mixed with air, which is supplied through a peripheral channel 3 with a swirler 5, and the resulting combustible mixture burns out in the subsequent zones of the torch. The regulation of the amount of air supplied to the air channels is carried out using a gate 6 by turning it around its axis.

Claims (1)

A device for burning fuel, comprising central and peripheral air channels located in a cylindrical housing with swirls, a primary and secondary manifold mounted on a circumference between the air channels, rotary gas distribution tubes, the outlet openings of some of the tubes being tangentially located, and the rest being radially to the axis of the device, which differs the fact that the axis of the device additionally has a central gas supply channel, while the ratio of the area of the outlet openings of the central to Nala feed gas to the total combined area of the gas outlet pipes and pivoting gazorazdayuschih central gas supply duct

is 0.1-0.4, and the gas distribution tubes are connected to the main manifold, and the central gas supply channel is connected to the additional manifold.

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