SU1078199A2 - System for preparing high-ash solid fuel and coal dressing waste for burning - Google Patents

Abstract

THE SYSTEM OF PREPARATION FOR THE BURNING OF HIGH-ash SOLID FUEL AND WASTE OF ENRICHMENT OF COAL by the author. St. No. 1028952, characterized in that, in order to increase reliability and efficiency, the fluidized bed furnace is divided by a vertical partition into two autonomous compartments, with the aero mix feed line to the burners and the additional gas duct connected to different compartments. (L sh co with

Description

The invention relates to the preparation of fuel for combustion and can be used in thermal power plants.

Systems are known for preparing the combustion of high-ash solid fuels and coal wastes containing a grinding device, a separator with a return pipeline, dust collectors, a finished dust bunker with a dust pipe, a combustion device, and a mixture of a mixture of aerosols in the burner 1.

The disadvantage of these systems is the low efficiency of combustion due to the lack of heat treatment of the finished fuel before combustion.

A system is also known to prepare for the combustion of high-ash solid fuels and coal wastes containing a grinding device, a separator with a return pipeline, dust collectors, a dust bunker with a dust pipe, a combustion device, and a mixture of feed mixtures to the burners. In this system, the combustion device for additional heat treatment of the finished dust is made in the form of a fluidized bed furnace and the return pipeline is connected below the level, and the finished dust bunker dust line and the aero mix feed line to the burners are above the level. Here, a part of the fuel, which constitutes the return fraction of the separator, is heat treated in a fluidized bed, and the rest of the fuel is mixed in it and fed to the burners. The gaseous products of combustion formed in the fluidized bed are divided into two streams, one of which is fed to the grinding device on the sub-suspension of the fuel, and the second serves as a transporting agent for the heat-treated fuel 2.

However, due to the increased flow of air into the fluidized bed furnace, the efficiency of this system is reduced, and the danger of explosion when the combustion products contact the fuel bed with the fuel remains.

The aim of the invention is to increase the explosion safety and efficiency.

This goal is achieved by the fact that in the preparation system for the incineration of high-ash solid fuels and coal wastes containing a grinding device, a separator with return pipelines, dust collectors, a finished dust bunker with dust pipes, an aero mix feed line, and a combustion device. fluidized bed with a connection to it below the level of the return pipe layer, and above - the dust pipe of the finished dust bunker, the air mixture supply line to the burners and the connection of the upper part of the furnace with azohodom to the inlet of the grinding apparatus combustor with a fluidized bed is divided by a vertical partition into two independent compartments and fuel mixture in the supply line

the burners and the additional flue pipe are connected to different compartments.

The drawing shows a system for preparing for the combustion of high-ash solid fuels and coal waste.

The system contains a raw fuel bunker 1 with a feeder 2, a grinding device 3, a separator 4 with a return pipe 5 and a feeder 6, dust collectors 7, a finished dust bin 8 with a dust pipe 9 equipped with a feeder 10, a fluidized bed furnace 11 separated by a vertical partition

12 on two autonomous compartments 13 and 14. Compartment

13 is connected at the top by a flue 15 with an inlet of the grinding device 3. Compartment 14 is connected by an air mixture supply pipe 16 to the burners 17 of the furnace 18 of the boiler 19 equipped with an air heater 20. Air ducts 21-24 connect the air heater to the burners 17 of the furnace 18, the fan 25 and further to the compartments 13 and 14

0 and exit from compartment 13. Air duct 24 is connected to fan 25 installed on duct 22. Return pipe 5 of separator 4 and dust pipe 9 are connected through mixer 26 using ejector 27 to sections 13 and 14 of furnace 11 below

fluidized bed level, and the mixture feed supply pipe 16 is connected to compartment 14 above the layer level. The bunker 8 of the finished dust is connected by a dust pipe 28 to the upper part of the compartment 14 of the firebox 11.

The system works as follows. The raw fuel from the hopper 1 is fed by the feeder 2 to the grinding device 3, where it is dried and milled. The dust from the device 3 is expelled by the existent agent into the separator 4, where it is separated from the non-ground fuel. From the separator, the dust enters the dust collectors 7, where it is separated from the drying agent and sent to the finished dust bin 8. Undercut fuel is fed by a feeder 6 from separator 4 through return line 5 to

0 mixer 26, where it is mixed with fuel coming from the bunker 8. The mixture through the ejector 27 enters compartment 13, where it burns in a fluidized bed with an excess of air much larger than one (o (mat 2.5-3) and compartment 14 where it is gasified with an excess of air much smaller than a unit ("mc 0.1-0.3). Such combustion regimes do not require placement of heat-receiving heating surfaces in a fluidized bed.

Part of the fuel from the hopper 8 feeders

0 10 can be directed along the dust line 28 to the air mixture supply pipe 16 to the burners, which is necessary to regulate the boiler load, since the air and fuel consumption in the compartment 14 should remain unchanged.

5 Combustion air or gasification to compartments 13 and 14 is supplied from air heater 20 through duct 24. Combustible gases formed during gasification of fuel

gases from compartment 14 pick up dust coming through dust pipe 28 from bunker 8 and transport the aero mix 16 to the burners 13 for burning in the furnace 18. This prepares the fuel to heat the formation of combustion gases, which intensifies dust ignition and reduces underburning The required excess air in compartment 14 is maintained by controlling the flow of air through the duct 22. The low value of the excess air coefficient in compartment 13 allows its size to be reduced and its efficiency to be improved.

gasification and heat treatment of dust, which improves the efficiency of combustion. Combustible combustion products from compartment 13 are mixed with air supplied through duct 23 and directed to the inlet of the grinding unit 3 for drying the fuel. The high excess air in compartment 13 ensures the absence of chemical incomplete combustion and explosion safety in the dust preparation system.

Thus, in the proposed fuel preparation system, the explosion safety and efficiency of the dust system and boiler plant are increased.

Claims (1)

SYSTEM FOR PREPARING FOR THE BURNING OF HIGH-ASH SOLID FUEL AND CARBON ENCRYPTION WASTE by ed. St. No. 1028952, characterized in that, in order to increase reliability and economy, the fluidized bed furnace is divided by a vertical partition into two autonomous compartments, and the pipeline for supplying air mixtures to the burners and an additional gas duct are connected to different compartments. 25 22 77 2Ϊ