SU1430675A1 - Furnace with circulating fluidized bed - Google Patents

Abstract

The invention can be used in steam and heating boilers. The purpose of the invention is to increase the combustion efficiency. The firebox contains a vertical shielded combustion chamber with hearth.,: In the walls of the chamber are located, connected to the channels for subchamber; primary air and return fly ash. Tonka also contains cold ash supply nozzles and recirculation gas channels connected to the nozzles. Under the camera is made solid. The nozzles and nozzles are placed in two parallel rusas with an arrangement in the upper russe of a railroad bridge and mounted tangentially to an axial chamber of an imaginary circle having a diameter of 0.2-0.7 of the chamber diameter. Such a topkk design provides for the afterburning of unburned combustible components in the chamber, reducing the content of solid particles in the flue gases and energy consumption to ensure the circulation of the layer, activates the horizontal mixing of working media in a single vortex. 3 il. yu (L

Description

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: The invention relates to furnace tech- nology and energy magnetic engineering and can be used in steam and hot water boilers: The purpose of the invention is to increase the efficiency of combustion.

FIG. depicts a firebox, longitudinal section; in fig. 2 — node I in FIG. Ij in FIG. 3 is an example of the tangential location of the nozzles.

The circulating fluidized bed furnace contains a vertical shielded combustion chamber 1 with a hearth 2 and 3 nozzles 4 located in its walls, connected with channels 5, 6 and 7 for supplying fuel, primary air and return of ash, branch pipes 8 for supplying cold sol | and channels 9 for supplying recirculated gases, communicated with nozzles 4. Above nozzles 4 (there is a secondary air supply device 10 JHoro and a pilot burner 11. | There are various options for connecting channels 5, 6, 7 and 9 to each other, and | also to the nozzles 4. For example, the channels 9 c 7 | dl under ode gas recirculation and return | entrainment may be first JK connected to each other and then to the channels 6 for supplying (primary air, said sub 1klyuchenie possible directly to cells 4 groin.

i -Under 2 chambers I burned solid. The nozzles 4 and the nozzles 8 are located in at least two parallel lines (themselves with an arrangement in the upper rue | nozzles 8 for feeding cold ash, | And the nozzles 4 and nozzles 8 are installed | tangentially to a coaxial chamber with an adjustable circle, having a diameter co-opaque 0.2-0.7 from chamber I diameter I. I The circulating fluidized bed furnace works as follows:: Channels 5 communicated with nozzles 4 The crushed fuel is fed into chamber 1. Simultaneously with the fuel supply, burner 11,

After the layer of the circulating filler is heated up to the ignition temperature, the nozzles 4 are connected, combined with the primary air cables 6, and the optimum flow rate of the primary and secondary air sources is established after the burnout is complete.

After the thinning of the mode, the calculated temperature of low-temperature combustion is determined based on the conditions of slagging and intensive binding of sulfur oxides. This temperature is provided by supplying the return of the gang, recirculation gases and cold ash, respectively, through channels 7 and 9 n through nozzles 8. At the same time, the combustion of previously unburned combustible components takes place in chamber 1. Since the temperature level is dependent on the characteristics of the fuel, the flow rate of the ash and recirculation gases i is variable.

Feeding the return of ash, recirculation gases, and cold ash back to the combustion chamber 1 allows the solids to be reduced in the flue gases, as well as the energy consumption for circulating the bed.

The arrangement of the pipes 8 above the nozzles 4 is due to the fact that the flue gas cooling cannot be carried out in the zone of ignition and initial combustion.

The installation of nozzles 4 and nozzles 8 tangentially to an imaginary circle having a diameter of 0.2-0.7 of the diameter activates the () isontal mixing of the working media in the resulting vortex, which leads to a burning efficiency.

Claims (1)

 Invention Formula A circulating fluidized bed furnace containing a vertical screened combustion chamber with a hearth and nozzles located in its walls connected to channels for fuel supply, primary: south of air and return-suck, characterized in that it additionally contains cold ash supply nozzles and recirculation gas supply channels, the latter of which are connected to the nozzles, in conjunction with the nozzles installed ta1T-Genally to the coaxial chamber of an imaginary circle having a D11a.meter. which is 0.2-0.7 of the chamber diameter, and is different. G) 1 are located at least two steam bars with a location in the upper branch pipe for feeding ho. Yudnoy ZO-cho, and the Pbd combustion chamber was taken out. cn / yushpym Fan SflSuvf aeff SffS yjfCf