SU1705672A1 - System for preparing fuel for combustion - Google Patents

Abstract

The invention relates to a power system and can be used in thermal power plants to prepare fuel for combustion in a steam generator furnace using low quality fuels. The invention improves the quality of drying solid fuels. The system contains a raw coal bunker 1, a feeder 2. supplying coal to a drying shaft 3. where the gases generated in the combustion chamber 4 also enter, which is supplied with liquid or gaseous fuel from an external source. The output of the drying shaft 3 is connected to the mill 5. The output of which is connected to the dust concentrator 6, where the fuel dried in the drying shaft 3 and ground in the mill 5 is divided into two parts - most of it goes to the main burners 7. And the smaller goes to the cyclone 9 wherefrom the collected dust is fed to the main burners 7, and the elusive dust and gases are fed to the additional combustion chamber 4 and additional burners 10. 1 sludge.

Description

The invention relates to a power system and can be used in thermal power plants to prepare fuel for combustion in the furnace of a steam generator when using low quality fuels.

Closest to the claimed device is a system for preparing fuel for burning, including a series-connected raw coal hopper, feeder, drying shaft, in communication with the steam generator furnace, a mill, a dust concentrator and a cyclone, the dust outlet of which is connected to the main burners of the steam generator furnace, and the exhaust pipe with additional burners in the furnace of the steam generator, and the drying shaft is connected by a gas pipeline to the furnace.

A disadvantage of the known device is the low quality of drying.

The purpose of the invention is to increase the efficiency of preparing fuel for combustion by improving the quality of drying.

The drawing schematically shows the proposed system.

The system comprises a raw coal hopper 1, a feeder 2, a drying shaft 3. connected in its upper part to an additional combustion chamber 4, and in the lower part to a mill 5, a dust concentrator 6, the dust extraction pipe of which is connected to the main burners 7 of the furnace 8 steam generator! and its exhaust pipe d. the inlet of the cyclone 9. The dust exhaust pipe of the cyclone 9 is connected to the main burners 7 of the furnace 8 of the steam generator, as well as to the additional combustion chamber 4, and the exhaust pipe of the cyclone 9 is connected to the additional burners 10 of the furnace 8 of the steam generator and located above the main burners 7, and with an additional combustion chamber 4 through the exhauster 11.

In an additional combustion chamber, a fuel supply 12 from an external source is provided. The drying shaft 3 can be in communication with the furnace 8 by a gas intake 13

The system for preparing fuel for combustion works as follows.

Solid crude fuel (coal) of poor quality from the hopper 1 through the feeder 2 enters the drying shaft 3. Gases for drying and transporting fuel are generated in the additional combustion chamber 4 as a result of the combustion of coal dust coming from cyclone 9. or (and) gaseous or liquid fuel entering through the supply 12. The amount of coal dust or gaseous or liquid fuel supplied to the additional combustion chamber 4 is determined by the required heat for drying solid crude fuel (coal). Coal grinding takes place in a mill 5. The dust-gas mixture is divided into two parts in a dust concentrator 6. The main part of the dried dust, together with the part of the gases and water vapor released during drying, goes to the main burners 7 of the furnace 8. A smaller part of the dried dust (up to 30% ) with most of the gases (up to 70%) enters cyclone 9, where most of the dust is captured in the cyclone and sent to the main burners of the boiler and to the additional combustion chamber 4. Part of the dust not captured in the cyclone together with the gases through the exhauster 11 enters the additional combustion chamber4, creating conditions for maintaining relatively low temperatures, in order to avoid slagging and lowering the temperature of the chamber walls (which allows the additional combustion chamber to be uncooled), and the other part goes to additional burners 10 furnace 8 steam generator. In the case of supplying the system with a gas pipeline 13, gases for drying and transporting fuel can be taken from the furnace 8 of the steam generator through the gas pipeline 13, which communicates the furnace 8 of the steam generator with s. Shilnym shaft 3.

Claims (1)

Claim A system for preparing fuel for combustion, which includes sequentially connected raw coal bins, a feeder, a drying shaft connected to the steam generator furnace, a mill, a dust concentrator and a cyclone, the dust outlet of which is connected to the main burners of the steam generator furnace, and the exhaust pipe to additional burners and a steam generator furnace characterized in that. that, in order to improve the efficiency of preparing fuel for burning by improving the quality of drying, the system is equipped with an additional combustion chamber, the output of which is connected to the drying shaft, and the fuel inlet is connected to an external source, and the non-exhaust pipe of the dust concentrator is connected to the main burners of the furnace of the steam generator, and the exhaust pipe of the dust concentrator with the inlet pipe of the cyclone, the dust exhaust pipe of the cyclone is connected to the main burners of the furnace of the steam generator and to the additional chamber Rania, and an exhaust pipe of the cyclone communicates with the additional steam generator furnace burners arranged above the main and additional combustion chamber.