RU222726U1 - Gas burner modernization device - Google Patents

Abstract

The utility model relates to fuel combustion units and can be used to modernize a gas burner in order to reduce emissions of nitrogen oxides (NOx). A device for upgrading a gas burner, which is a gas manifold with two inlets, internally divided by a partition that provides gas supply from one inlet to the gas outlets on the inner wall of the gas manifold, and from the other inlet to the gas distribution tubes, the ends of which are brought out beyond the plane of the boiler screen , L-shaped gas nozzles are attached to the ends of the gas distribution tubes by threaded connections, providing gas supply outside the air flow leaving the burner. Gas nozzles are equipped with mixers. 1 salary f-ly, 3 ill.

Description

The utility model relates to fuel combustion units and can be used to modernize a gas burner in order to reduce emissions of nitrogen oxides (NOx).

Known gas-oil burners MGMG-6, MGMG-8; MGMG-10, intended for installation on hot water boilers (see Mechanical Engineering, Encyclopedia, editor-in-chief K.V. Frolov, Boiler installations, vol. IV-18, M., 2009, p. 226, fig. 2.4.21) . The gas in the burner in question is supplied to a gas manifold, which has one inlet and provides gas outlet through holes on the inner wall of the gas manifold.

The disadvantage of the considered burner is the low environmental efficiency of fuel combustion due to the design flaws of the burner in the method of organizing the combustion process, in which all gaseous fuel is supplied to the air.

One of the effective ways to reduce NOx emissions is the use of forced flue gas recirculation, which reduces the flame temperature and reduces the concentration of reactants that determine the formation of NOx. In this case, the most effective method is to supply flue gases into the burner channels (SU 1101622 A1, IPC F23D 17/00, published 07/07/1984). This method is implemented in the burner of the TGMP-204 boiler, consisting of two air supply channels (central and peripheral), equipped with tangential registers, a recirculation flue gas input channel is located on the periphery, and a fuel oil nozzle is installed in the center of the heater. The gas part of the burner consists of an annular gas manifold, a gas distribution nozzle in the form of a cone with holes and a gas supply pipe. The internal pipe of the gas manifold is the guide pipe of the steam-mechanical nozzle (Ya.P. Storozhuk. Tests of the TGMP-204 boiler of the 800 MW unit after reconstruction of the flue gas recirculation input into the furnace / Y.P. Storozhuk, D.R. Nosulko // Thermal power engineering. - 1984. - No. 5 - P. 13-15.). This burner was not able to achieve a good NOx reduction result due to design flaws in the combustion process.

To successfully suppress NOx, it is necessary that the recirculated flue gases do not ballast in the root region of the burner, but reach the active combustion zone, where the main formation of NOx occurs. The main disadvantage of this method of organizing combustion remains the need for a system of forced supply of flue gas recirculation with a recirculation smoke exhauster.

The main purpose of the patented utility model is to modernize the burner device to reduce NOx emissions during gas combustion through low-cost replacement of the gas distribution device. The solution to the problem is achieved by installing a new gas distribution device instead of the existing gas distribution device, consisting of a two-channel gas manifold with two inlets, with gas outlet holes on the inner surface of the manifold and gas distribution tubes; inside the gas manifold is divided by a partition that provides gas supply from one inlet to the gas outlet holes on the inner wall of the gas manifold, and from the other entrance - to the gas distribution tubes that lead gas nozzles into the firebox beyond the embrasure.

Mixers can be installed on gas nozzles to organize controlled ejection quality. By organizing intra-furnace recirculation of flue gases by ejecting flue gases directly from the furnace with gas jets, the gas is diluted with flue gases, which ensures a decrease in the flame temperature and the concentration of reacting substances, which leads to a decrease in the formation of NOx.

In fig. 1 - gas distribution device for modernizing the burner assembly.

In fig. 2 - gas distribution device in a disassembled state.

In fig. 3 - burner, modernized with the use of a patented gas distribution device.

The gas distribution device (Fig. 1) consists of a gas manifold 1, two gas inlets 2 and 3, gas outlets 4 located on the inner wall of the gas manifold, and gas distribution tubes 5.

The gas distribution device consists of (Fig. 2): two walls 6 and 7, an outer shell 8 with inlets 2 and 3, a partition 9 with bumpers 10 and 11, an inner shell 12 with gas outlets 4 and gas distribution tubes 5 (not all tubes are shown) . Gas nozzles 13 are connected to the gas distribution tubes. Mixers 14 can be installed on the gas nozzles 13.

In fig. 3 shows a burner 15, on which a gas distribution device 1 is installed with two inlets 2 and 3 and gas distribution tubes 5, the ends of which are brought out beyond the plane of the boiler screen 16; gas nozzles 13 are attached to the gas distribution tubes 5, which provide gas supply 17 outside the air flow 18 coming out of the burner.

The burner is ignited when gas is supplied to inlet 3, which provides gas supply to the gas outlets 4 located on the inner shell of the manifold 1, to gas inlet 2, which provides gas supply to the gas distribution tubes 5, the gas is supplied after the fuel-burning unit has gained power and the furnace has warmed up to sufficient temperatures for stable ignition. Further, the burner power increases due to an increase in gas flow through inlet 2 with a constant or gradually decreasing gas flow through inlet 3. At maximum burner power, the gas flow through inlet 3 can be 10% or less to ensure stabilization of ignition. At intermediate loads, the ratio of gas flow between the inlets depends on the design features of a particular furnace and is determined during the period of operational testing.

The use of a gas distribution device ensures a reduction in the NOx content in flue gases during operation of the modernized burner by 40-70% without reducing the technical and economic characteristics of the fuel combustion plant and the construction of an external flue gas supply system.

Claims (2)

1. A device for upgrading a gas burner, which is a gas manifold with two inlets, internally divided by a partition that provides gas supply from one inlet to the gas outlets on the inner wall of the gas manifold, and from the other inlet to the gas distribution tubes, the ends of which are extended beyond the plane of the screen boiler, L-shaped gas nozzles are attached to the ends of the gas distribution tubes by threaded connections, providing gas supply outside the air flow leaving the burner. 2. The device according to claim 1, characterized in that the gas nozzles are equipped with mixers.