SU1495571A1 - Boiler unit - Google Patents

Abstract

The invention relates to fluidized bed combustion devices and makes it possible to increase the economy and reliability by post-burning of the ash and dip. The boiler plant (KU) contains a combustion chamber (CS) 1 with an air distribution grille (BP) 2 and a manifold made of two pipes 10, under which a screw conveyor (PC) 11 is located, which adjusts the layer height, returning the dip to the volume of COP 1, removes focal residues from COP 1 when stopping CU. The control of the load on the CU is carried out by changing the revolutions of the PC 11 and its operation time for external ash removal or recirculation. KU allows to increase maneuverability and reliability when performing KS 1 from autonomous modules, to increase profitability by afterburning of fly ash and failure when using fuel of different quality and variable operating modes. 2 Il.

Description

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The invention relates to fluidized bed combustion devices and can be used in thermal power plants, as well as in the chemical and metallurgical industries for the production and processing of mineral raw materials.

The purpose of the invention is to increase efficiency and reliability by post-burning of ash and failure.

Fig, G depicted KOTejjbHa installation; figure 2 - section aa in figure 1.

The boiler plant contains a fluidized bed combustion chamber 1, in the lower part connected to an air distribution pan 2 with an air collector connected by hot air duct 3 to an air heater 4 ,. in the upper part, communicated with the cyclone 5 installed in the duct 6 in front of the heating surfaces (not shown) and the heater preheater 4 and the connected line 7, the recirculation of ablation with a fan 8, with a combustion chamber 1, as well as an ash removal device JKCleaned to chamber 1 and channel 9 ash removal.

The blown collector is made of at least two pipes 10, an ash removal device is located under the barrel, completed in the form of a reversible screw conveyor 1I connected at its ends to the channel 9 of ash removal and transfer line 7 of the entrainment recirculation connected by bypass lines 12 and 13 to the gas duct 6 and the hot air pipeline 3, the fan 8 being installed on the recirculation line 7 after the cyclone 5 and in front of the screw conveyor 11. At the ends of the conveyor 11, the grilles 14 are installed. Installation is under each two pipes 10 individual lnyh transporter 11 allows the modules to create a systemic theme.

Boiler installation works as follows.

Prior to starting the starting chamber of the ignition (not shown) of the fluidized bed, the screw conveyor 11, the recirculation fan 8 and the cyclone 5 are turned on. Air is supplied by a blower fan (not shown) through the pipeline 3 to the pipes 10. The lining is inert backfilling layer (focal

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residues), the height of which is regulated by the conveyor 11. Fuel is supplied to the combustion chamber 1 and kindled. In the combustion process, the flue gases enter the cyclone 5, from which the gas purified from entrainment is directed to the flue 6, and the solid particles return to the combustion chamber 1 via the recirculation line 7. Until the temperature of the bed, which ensures stable combustion of the fuel, is reached, the fan 8 operates continuously and then can be switched on periodically, based on the requirements of minimum flue losses.

After ignition and the beginning of the process of the failure of focal residues, the quality of burning is controlled. In the case of a large underburning, the screw conveyor 11 is reversed in the direction of the recycling fan 8. The dip advanced to lattice 14 gushes into the volume of the combustion chamber 1. In this way, the failure recirculation is carried out. Underburning in the form of fly ash in the flue gases from the cyclone 5 and the flue 6 enters through line 12 to the inlet of the fan 8. Some of the gases fall between the pipes 10, the fire and the layer.

If it is necessary to change the load of the boiler plant, for example, to increase it, the bed height increases by increasing the fuel supply to the combustion chamber I and the amount of air both through conduit 3 and through lines 13 and 7 to the openings between the pipes 10. This forces the combustion process and contributes afterburning combustible in the dip.

When the load is reduced, the fuel supply is reduced and, if necessary, improvements in the burning process turn on the conveyor 11 for recycling. Adding, via line I2, to line 7 of the recirculation, gases from the flue 6, regulate the oxygen content in the bed and the rate of combustion reaction, and hence the load value. If necessary, a deep load reduction disable one of the modules.

Load control is also carried out by changing the speed of the conveyor 11 and its operating time for external ash removal or recycling.

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Claims (1)

SUMMARY OF THE INVENTION A boiler plant comprising a combustion chamber connected in the lower part to an air distribution grill with an air collector connected by a hot air pipe to an air heater, and in the upper part, connected to a cyclone installed in the duct in front of the heating surfaces and an air heater and connected by an ablation recirculation line equipped with a fan, with a combustion chamber, and also an ash removal device connected to the latter and the ash removal channel, characterized in that, with In order to increase efficiency and reliability by burning off the ablation 20 and the failure, the air collector is made of at least two pipes, under which there is an ash removal device made in the form of a reversible screw conveyor 25 connected at its ends to the aforementioned ash removal channel and an ablation recirculation line connected by-pass lines to the gas duct and the hot air pipe, wherein the 3Q fan is installed on the ablation recirculation line after the cyclone and in front of the screw conveyor. Aa FIG. 2