SU1314191A1 - Apparatus for burning fuel - Google Patents

Abstract

The invention relates to devices for utilization of lean hydrocarbon gas-air mixtures (HS) with a concentration below the lower ignition limit by the combustion method and can be used in the energy, chemical and coal sectors. The purpose of the invention is to improve the quality of combustion of HS with different heat of combustion by automatically controlling the combustion process. Preheating / Egazy S teloomeni} rtHs serve the injuries. The latter burns out from the side (PS), through the walls they go up to the boiler and the heat from the side of the combustion system through the system Thermocouples with backup X. T PSHPPSH / C system regulated by heating in the heat exchanger, the HS is fed into the pipe 4 chambers (K) 1 of combustion through a tangential nozzle 6. The latter is installed outside of K 1 from the side of the fuel nozzle 5. The HS burns into K 1. Then products of combustion (PS), giving part of his About heat through the wall of pipe 4 of the HS and heating it to the ignition temperature, enter the pipe 2 of the PS outlet, from where it enters the heat exchanger and then into the waste heat boiler. When the heat of combustion of the HS increases relative to the nominal, the PS redistributes through pipes 2 and 7 by rotating the valves 8 and 9 working through the control system from two thermocouples 10 and 11. When the heat of combustion of the HS decreases relative to the nominal through the control system from thermocouples 10 and 11 it turns on nozzle with reserve fuel. 1 il. (L s / G system for extinguishing with QD. N liquid fuel Gas-air mixture of steel

Description

1131419

The invention relates to devices for utilization of hydrocarbon gas-air mixtures with a concentration of the lower-lower ignition limit by the combustion method and can be used in power engineering, chemical, coal and other industrial zones.

The aim of the invention is to improve the quality of combustion of gas-air mixtures with different heats of heat by automatically regulating the combustion process.

The drawing shows schematically a fuel burning device, tS longitudinal section. .

The device contains a combustion chamber 1 with a nozzle 2 for exhausting combustion products and a central tube 4 installed in the chamber 1 20 with an annular gap 3, provided with a fuel inlet 5 at the inlet. The central tube 4 outside the combustion chamber 1 is provided with a 25 tangential nozzle 6 inputs of the gas-air mixture, and the chamber 1 itself. It has the second branch pipe 7 of the exhaust of combustion products, while the branch pipes 2 and 7 of the removal of the combustion products are equipped with 30 rotary valves 8 and 9, respectively, interlocked with each other. m inside chamber 1, behind the output slice of the Central Tpy6j5i 4 and in the annular gap 3, an additional 35 thermocouples 10 and 11 are installed, controlling the shutters 8 and 9.

The device works as follows.

Through the tangential nozzle 6 40, the gas-air mixture preheated in the heat exchanger is fed into the central pipe 4, which burns in the combustion chamber 1. Then the products of combustion, giving away some of their heat 45 through the wall of the pipe 4 to the swirling flow of the gas-air mixture and heating

it to the ignition temperature (800-900 ° C), enter the pipe 2

removal of combustion products, from where they enter the heat exchanger (not shown), where the initial gas-air mixture is heated to 400-450 ° C. After the heat exchanger, the combustion products are sent to the waste-heat boiler or other heat exchangers.

The proposed device allows to burn lean hydrocarbon gas-air mixtures with a concentration of coal.

5 0 5

0 5

0

five

hydrogen gases below the lower ignition limit and heat of combustion less than 350 kJ / m. In this case, there are no losses from underburning fuel. In addition, it is possible to automatically control the combustion process when changing the heat of combustion used to burn lean hydrocarbon gas mixtures.

The automatic adjustment is as follows.

With an increase in the heat of combustion of the gas-air mixture relative to the nominal combustion process moves into the pipe 4, which reduces the temperature difference in thermocouples 10 and 11 and through the control system leads to covering the valve 8 and opening the valve 9. There is a redistribution of combustion products in the pipes 2 and 7, heat transfer from the combustion products to the gas-air mixture is reduced. The combustion process moves to the combustion chamber 1, restoring its temperature regime and the nominal temperature difference on thermocouples.

When the heat of combustion of the gas-air mixture decreases relative to the nominal combustion process, it partially moves from the combustion chamber 1 to the annular gap 3. The temperature difference in the thermocouples increases, and the nozzle with reserve liquid fuel automatically switches on through the control system. The burning process is restored.

Claims (1)

Claims An apparatus for burning a fuel, comprising a combustion chamber with a branch pipe for discharging combustion products and installed in. An annular gap chamber has a central pipe equipped with a fuel inlet at the inlet, characterized in that, in order to improve the combustion quality of gas / air mixtures with different heat of combustion by automatically controlling the combustion process, the central pipe outside the combustion chamber 1 and from the fuel inlet side is tangential the inlet of the gas-air mixture, and the chamber itself has a second outlet for the combustion products, with both outlet pipes for exhaust products 313141914 The wounds are equipped with rotary dampers of the central tube and in annular rings interlocked with each other; the gap is additionally installed inside the chamber behind the output couples controlling the dampers.