section Home Production, Amateur Radio amateur Model aircraft, rocket- Useful, entertaining	Stealth master Electronics Physics Technologies invention	space Mystery Earth Mysteries Secrets of the Ocean Stealth section Map
Use of material is permitted for reference (for websites - hyperlinks)

INVENTION
Russian Federation Patent RU2151956

RADIATION BURNER

Name of the inventor: Shmelev VM .; Margolin AD
The name of the patentee: Institute of Chemical Physics, Russian Academy of Sciences. NN Semenova
Address for correspondence: 117977, Moscow, ul. Kosygin 4, Institute of Chemical Physics, Russian Academy of Sciences, the patent department
Starting date of the patent: 1999.03.03

The invention relates to a power system, namely the radiation burners, and can be used for domestic and industrial needs in various thermal power plants, in the household and household gas stoves, heaters, dryers, furnaces. The radiant burner comprising a body, an injector in the form of a gas nozzle with a mixing tube, ceramic perforated emitting nozzle and a radiation shield, the radiation shield is in the form of a set of extended geometric elements, eg plates, cylinders made of quartz or ceramics forming-hole cells with cells transverse dimension of 10 mm and a height not less than the transverse dimension of the cells having a total flow area relative more than 0.8, and is removed from the surface of the nozzle by a distance not greater than the transverse dimension of the cells, but not more than one third the size of the nozzle cross that provides completeness of combustion of fuel and a sharp decline in the amount of CO in the combustion products, improving combustion stability in a wide range of changes in fuel pressure, increase the radiation efficiency, improve the radiation pattern and the extension of the scope of the burner.

DESCRIPTION OF THE INVENTION

The invention relates to a power system, namely the radiation burners, and can be used for domestic and industrial needs in various thermal power plants, in the household and household gas stoves, heaters, dryers, furnaces.

Industrial burner is known (US N 5174744 from 29.12.92g patent.) With low emissions of CO and _NO x to the atmosphere, which consists of a mixing unit of fuel and oxidant, the perforated ceramic plates (nozzles), at which the combustion gas, and light mesh screen that is, heating the burner flame, increases the temperature of the emitting surface of the matrix and contributes to the oxidation of CO to CO _2, reducing CO emissions, and the screen is mounted above the burner plate at a distance that depends on the length of the flame.

A drawback of this burner is weak mechanical strength light metal mesh screen and its cover in the form of a special ceramic foam, and a substantial manufacturing complication burner.

Known radiation burner (copyright certificate N 2066023, cl. 6 F 23 D 14/12, 1994), comprising a housing with a perforated lid, playing the role of radiation shield fitted in the outlet portion of the body emitting nozzle.

A drawback of this burner are high demands on the thermal and oxidative stability of screen caps that determine the need to use expensive nickel steel grades. Availability screen cover increases the hydraulic resistance deteriorates combustion stability at low fuel pressures, and ensures reduction of carbon monoxide in the combustion products below 0.008%.

The closest technical solution is a burner infrared radiation, comprising a housing with the adjoining reflector injector as a gas nozzle and disposed in the inlet portion of the mixing tube body, a reflector arranged opposite the output cut of the latter, and arranged in the outlet portion of the housing to form a combustion chamber ceramic emitting nozzle with a flat front and the radiating surface and the mesh screen (copyright certificate N 2084762, cl. 6 F 23 D 14/12, 1994). The combustion of the fuel-air mixture in the burner occurs mainly in the surface zone within the channels and on the surface of the emitting nozzle and post-combustion of unburnt components in the space between the ceramic matrix and the mesh screen. The use of screen mesh increases the radiative burner efficiency. However, use of the grid increases the flow resistance path, limits the length of the burner, and does not provide a sufficient reduction in CO emissions. Using the perimeter reflector and the burner is not efficient enough, although somewhat improved radiation pattern.

The object of the invention is to provide a burner having improved environmental and performance characteristics which can provide fuel combustion efficiency and a sharp decrease in the amount of CO in the combustion products, improving combustion stability in a wide fuel pressure variation range, an increase in radiation efficiency, improve the radiation pattern and the expansion application burner.

This object is achieved in that the radiating burner comprising a housing, the injector of the gas nozzles to the mixing tube, ceramic perforated emitting nozzle and a radiation screen, the radiation screen is made as a set elongated geometric elements, eg plates, cylinders made of quartz or ceramic-forming cell openings with a cross mesh size not less than 10 mm and a height not less than the transverse dimension of the cells having a total flow area relative more than 0.8, and is removed from the surface of the nozzle by a distance not greater than the transverse dimension of the cells, but not more than one third transverse nozzle size.

Hitherto radiation screens mounted on a nozzle surface radiation burners, typically fabricated of a metal mesh or a perforated thin metal plate. Surprisingly, when the radiation shield in the form of extended geometries of ceramic or quartz material operational and environmental characteristics of the burner increase sharply. In the proposed radiation burner thanks to the great height of the screen cells a significant portion of radiation flux from the surface emitting nozzle reflected walls screen cells back and combustion zone of the nozzle surface is isolated from the mixing of cold ambient air, which leads to an increase in the surface temperature of the emitting nozzle and the temperature of the combustion products to a value providing a complete before completion of the chemical reactions inside the display screen and cells. In addition, the length of the screen elements improves the radiation pattern due to clipping of the side lobe, which allows the screen to perform an additional function of the reflector and the relative high total flow area of ​​the screen openings-cells (greater than 0.8), low flow resistance causes the flow of combustion products, resulting in improving combustion stability in a wide range of fuel pressure changes. It should be noted that in conventional flat panel displays with increasing relative total passage section above 0.5 drastically reduced reflectivity of the screen. High performance and environmental characteristics of the burner and and a good radiation pattern extend the scope of the burner, as a powerful source of infrared radiation.

The proposed technical solution shown on the attached drawing, which shows a longitudinal section of the burner (s) and a top view of the screen is constructed as a cylinder set. The proposed radiation burner comprises a housing 1, an injector arranged in the form of gas nozzle 2 to the mixing tube 3, a ceramic perforated emitting nozzle 4 and the radiation shield 5, formed as a set of extended geometric elements, eg plates, cylinders made of quartz or ceramics forming cell-opening cross mesh size not less than 10 mm and a height not less than the transverse dimension of the cells having relatively more than the total flow section 0.8. The screen set at a distance H, is not greater than the transverse dimension of the cells, but not more than one third of the cross nozzle size.

The burner operates as follows. The gas emerging from the nozzle 2 into the mixing tube 3, injects a required amount of air, forming a gas-air mixture of the desired composition, which penetrates through the ceramic nozzle perforated walls, burns near its surface. The combustion products from the combustion zone pass through the radiation screen of the cell, placed directly above the nozzle surface, which is due to a substantial extent its elements prevents the penetration of cold air into the reaction zone, ensures complete perfection of chemical reactions with the exclusion quenching incomplete conversion products from their mixture with cold air, and the total relative large orifice defining a minor hydraulic resistance to the flow of combustion products, enhances the combustion stability in a wide range of fuel pressure change.

The surface of the nozzle is heated to a high temperature, as a powerful source of infrared radiation. Radiation stream passes through the nozzle surface extended radiation shield cell surface remote from the nozzle by a distance not greater than the transverse dimension of the cells, wherein the portion of the radiation reflected back by the cell walls and the nozzle is absorbed by the surface, increasing its temperature and flue gas temperature to a value of 1000-1200 ^{o C.} This in turn leads to further increase in the radiation flux from the surface of the nozzle and an increase in the radiation efficiency of the burner, and to maintain high temperature combustion products at a distance of 10 mm from the surface of the nozzle in front of the screen and provides a full screen cells completeness of chemical reactions, including oxidation of the CO to CO _2. The long screen reduces heat loss and radiation to the side, forming a thermal stream of products of combustion and directed the radiation flux, performing an additional function of the reflector.

Selected parameters of the radiation of the screen is defined as follows. Transverse cell size of at least 10 mm at a relative flow area greater than 0.8 provides a minor hydraulic resistance to flow of the combustion products of the burner ensuring stable operation in a wide range of fuel flow. The height of the radiation shield is not less than the transverse dimension of the cells provides complete perfection of chemical reactions with the exclusion of "quenching" of eliminating the penetration of cold ambient air into the afterburner CO zone and provides reflected a significant part of the radiation flux on the surface of the emitting nozzle reduces losses heat and radiation side and the formation of a thermal stream of combustion products and directional flux. Removing the screen from the surface of the nozzle at a distance no greater than the transverse dimension of the cells, provides sufficient transparency to the screen of the emerging radiation.

Making the screen geometric elements of the common varieties of quartz or heat-resistant ceramics causes low cost and longevity of the screen, but also good optical properties of the cell walls (sufficient reflectivity and low for quartz infrared transmittance in the region of 2-2.5 mm). The mesh screen structure design provides its high strength.

Experimental Study of Radiation burner with the selected parameters of the radiation screen showed its high efficiency. When installing a radiation shield, constructed as a set of 24 thin-walled quartz cylinder 30 mm high, 16 mm in diameter at a distance of 5 mm from a standard flat surface perforated with a ceramic nozzle of 1 mm diameter channels has increased the radiating surface temperature to ^200-250 o C , to increase the radiation efficiency of 60% and reducing the concentration of carbon monoxide by 20 times. The burner operated stably in a wide range of gas flow rate, up to a low specific heat capacity of 50-100 kW / m ² and was characterized by a good radiation pattern due to a significant reduction of radiation side.

Thus, the technical solution of the burner design is aimed at solving this problem and to achieve the specified technical result - increasing environmental and operating the burner performance by ensuring complete combustion of fuel and a sharp decline in amount of CO, improve combustion stability over a wide fuel pressure variation range, increasing its radiation efficiency and improve the radiation pattern.

CLAIM

Radiation burner comprising a housing, an injector in the form of a gas nozzle with a mixing tube, ceramic perforated emitting nozzle and a radiation shield, characterized in that the radiation shield is in the form of a set of extended geometric elements, eg plates, cylinders made of quartz or ceramics forming cells retention adapter with transverse mesh size not less than 10 mm and a height not less than the transverse size of cells having a relative cumulative flow area greater than 0.8, and is removed from the surface of the nozzle by a distance not greater than the transverse dimension of the cells, but not more than one third the size of the nozzle cross- .

print version
Publication date 21.03.2007gg

NEW ARTICLES AND PUBLICATIONS
	The technology of manufacture of universal joints for besvarochnogo, threadless, besflyantsevogo connection pipe segments in high-pressure pipelines (a video)
	Oil and petroleum products purification technology
	On the possibility of moving mechanical system due to internal forces
	Glow liquid in a thin dielectric kanaloh
	The relationship between quantum and classical mechanics
	Millimeter waves in medicine. A New Look. IIM therapy
	Magnetic engine
	The heat source on the basis of units nososnyh