CN207066152U - Stove waste heat from tail gas raw coal drying system - Google Patents

Abstract

The utility model discloses a kind of stove waste heat from tail gas raw coal drying system.The system includes raw coal system, drying system and dust pelletizing system, the core component of drying system is tower drier, the tower drier includes flue and dispenser, the high-temperature tail gas of non-removing dust passes through from flue, dried by walling of flue and raw coal heat exchange, dispenser increase raw coal whereabouts flow, the cleaning tail gas hot blast direct contact heat transfer drying crossed with dust removal process, ensure that the degree of purity of raw coal.The system footprint area is small, saves the energy.

Description

Stove waste heat from tail gas raw coal drying system

Technical field

The utility model is applied to the industrial furnace system equipment of the industries such as mine, metallurgy, building materials, is related to one kind and utilizes stove The raw coal drying system of kiln high-temperature tail gas waste heat, the industrial furnace being particularly suitable for use in by the use of coal dust as the energy.

Background technology

The industrial furnace of the industries such as mine, metallurgy, building materials is production necessary equipment, and these stoves generally consider in design The heat recovery of high-temperature tail gas and comprehensive utilization.Accompanying drawing 1 is to use coal dust to equip letter for a kind of Limestone rotary kiln of the energy Figure, including rotary kiln, preheater, cooler, burner, flue, deduster, air blower and chimney.Rotary kiln exists lime stone Calcining be lime under high temperature, and coal dust is blowed into rotary kiln and provides high-temperature calcination heat energy by burner, cooler by high-temperature lime and Combustion air carries out heat exchange, improves the combustion-supporting efficiency of air, and preheater is carried using the high temperature of tail gas to entering kiln lime stone Preceding baking preheating, high-temperature tail gas cool.Generally, about 200-300 DEG C of the exhaust temperature come out from preheater, through cold But after, into deduster dedusting, then pump into chimney discharge and diffuse through air blower.

The high-temperature tail gas come out from preheater, to meet the job requirement of deduster（Typically≤200 DEG C）Arranged, it is necessary to take Apply and radiating and cooling is carried out to high-temperature tail gas, conventional measure is to use mechanical air cooler, and cooling pipe is forced using natural air Interior high-temperature tail gas.This type of cooling, that is, the waste heat of high-temperature tail gas is wasted, also increases power consumption.

Raw coal as calcined by rotary kiln fuel is influenceed by market condition, and its water content is often higher, reaches as high as sometimes To more than 20%, the production efficiency that processing coal dust is ground by raw coal is had a strong impact on.To meet the demand for fuel of calcined by rotary kiln, lead to Often need to be separately provided dryer and hot-blast stove to raw coal progress drying and processing（Combustion of Hot Air Furnace raw coal, improve and dry for dryer It is dry to use hot blast）, then ground, so as to add the equipment complexity of coal dust production, add floor space and energy consumption.

The content of the invention

The utility model solve technical problem be：Raw coal is dried using stove high-temperature tail gas waste heat, accomplishes stove The abundant recycling of kiln exhaust gas heat, reduce raw coal drying energy consumption.

The utility model adopts the technical scheme that：

Stove waste heat from tail gas raw coal drying system includes raw coal system, drying system and dust pelletizing system.The raw coal system The feeding system of machine composition is carried including feed ore deposit groove, oscillating feeder I and elevating hopper, and by oscillating feeder II and belt feeder The discharge system of composition.The drying system includes tower drier, hot air duct and air blower, and the air blower passes through hot blast Tail gas hot blast is sent into the bottom of tower drier by pipeline；There is flue to pass through among the tower drier, inside is disposed with scattered Cloth device；The dust pelletizing system includes drying system deduster and drying system air-introduced machine, and drying system air-introduced machine is by tail gas hot blast Extracted out from tower drier top, be sent into drying system deduster.

The utility model obtain technological progress be：The system is dried using stove high-temperature tail gas waste heat to raw coal, Fuel is not used additionally, has saved the energy.Raw coal is separated by flue and untreated high-temperature tail gas, clear with removing dust processing Clean tail gas directly contacts drying, ensure that the degree of purity of raw coal.

Brief description of the drawings

Fig. 1 is rotary kiln production process schematic diagram；

Fig. 2 is the utility model schematic flow sheet；

Wherein：1- preheaters, 2- rotary kilns, 3- coolers, 4- burners, 5- flues, 6- dedusters, 7- air-introduced machines, 8- Chimney, 9- feed ore deposits groove, 10- oscillating feeders I, 11- feedings bucket elevator, 12- belt feeders, 13- dispensers, 14- warm-air pipes Road, 15- air blowers, 16- air outlets, 17- baker system dust removings device, 18- drying systems air-introduced machine, 19- drying systems chimney, 20- chimney intakes, 21- flue outlets, 22- oscillating feeders II, 23- tower driers.

Embodiment

Accompanying drawing 1 is rotary kiln production process schematic diagram, and coal dust firing is given rotary kiln 2 to provide heat energy, calcining by burner 4 Lime, high-temperature lime blanking, high-temperature flue gas after the cooling of cooler 3 exchange heat with lime stone in preheater 1, entered through flue 5 Deduster 6, it is sent into chimney 8 through air-introduced machine 7 and discharges.

Stove waste heat from tail gas raw coal drying system as shown in Figure 2, including three systems, raw coal system, drying system and Dust pelletizing system.Raw coal system includes the feeding system that feeder channel 9, oscillating feeder I 10 and feeding bucket elevator 11 form, Yi Ji The discharge system that the oscillating feeder II 22 and belt feeder 12 of the lower section of tower drier 23 form.The loaded machine of raw coal is sent into feed In ore deposit groove 9, it is sent into through oscillating feeder I 10 and feeding bucket elevator 11 in baker, raw coal is rolled in baker in " it " font Backflow to move and fall, fallen into after drying in the bottom hopper of bottom, card is then transported to by oscillating feeder II 22 and belt feeder 12 Car, the raw coal after drying is sent to coal dust milling station by truck.

Drying system includes tower drier 23, hot air duct 14 and air blower 15, the cigarette receiving chimney 8 of hot air duct 14, air blast The tail gas hot blast cleaned after dedusting is sent into tower drier 23 by machine 15 by hot air duct 14, and tail gas hot blast is in baker Flow from bottom to top, the falling direction with raw coal is on the contrary, ensure that the sufficient heat exchange of tail gas hot blast and raw coal.Tail gas hot blast by The air outlet 16 of baker comes out, into dust pelletizing system.The chimney intake 20 of tower drier connects with preheater 1, and flue goes out Mouth 21 is connected with deduster 6, and flue 5 is passed through among tower drier 23, and raw coal is transferred heat to by flue metallic walls, Play a part of drying raw coal.It is disposed with " it " font dispenser 13 in tower drier 23, dispersible whereabouts stream, while can Increase raw coal whereabouts flow, extend the time of contact of raw coal and dispenser 13 and tail gas hot blast, be advantageous to the abundant drying of raw coal.

Dust pelletizing system includes drying system deduster 17, drying system air-introduced machine 18 and drying system chimney 19, exhaust gas heat After wind dries raw coal, the air outlet 16 through the top of tower drier 23 enters in drying system deduster 17, and removing dust meets The tail gas hot blast drying system air-introduced machine 18 of emission request is sent into drying system chimney 19 and discharged.

The raw coal drying system is dried using waste heat from tail gas to raw coal, and tail gas is divided into two parts, a part of tail gas warp Turn into the tail gas hot blast of cleaning after dedusting, pump into tower drier, dried with raw coal direct contact heat transfer.Another part high temperature The non-removing dust of tail gas, passes through out of flue, is exchanged heat and dried using walling of flue, not contacted directly with raw coal, prevent raw coal to be contaminated, It ensure that the degree of purity of raw coal.

The raw coal drying system makes full use of original flue, and floor space is small；The system is entered using waste heat from tail gas to raw coal Row drying, does not use fuel additionally, saves the energy.

Claims (1)

1. a kind of stove waste heat from tail gas raw coal drying system, including raw coal system, drying system and dust pelletizing system, its feature exist In：The raw coal system includes feed ore deposit groove（9）, oscillating feeder I（10）With feeding bucket elevator（11）The feeding system of composition, With by oscillating feeder II（22）And belt feeder（12）The discharge system of composition；The drying system includes tower drier （23）, hot air duct（14）And air blower（15）, the air blower（15）Pass through hot air duct（14）Tail gas hot blast is sent into vertical Formula dryer（23）Bottom；The tower drier（23）There is flue centre（5）Pass through, inside is disposed with dispenser（13）； The dust pelletizing system includes drying system deduster（17）With drying system air-introduced machine（18）, the drying system air-introduced machine（18） By tail gas hot blast from tower drier（23）Top is extracted out, is sent into drying system deduster（17）.