CN101275739A - Semi-boiling circulating bed dust removing combustion returning combustion furnace of helical feeding paddy hull or the like straw bran - Google Patents

Abstract

Disclosed is a semi-boiling cycling bed dust removal burner of the straw bran such as the screw rice hull etc., particularly a stream boiler, a condition oil boiler, an air stove and a straw source device of the general industrial furnace provided with a screw bran feeding device, a semi-boiling bed, a main and an assistant draught fan, a dust return fan, a bottom fan and a gas recirculation duct, which are used to separating the smoke and then recycle to the chamber for burning the straw stem, the sawdust and the leaves etc. through the external dust removal device.

Description

The semi-boiling circulating bed dust removing combustion returning combustion furnace of straw brans such as a kind of helical feeding paddy hull

The present invention relates to the semi-boiling circulating bed dust removing combustion returning combustion furnace technology of straw brans such as a kind of helical feeding paddy hull, especially be provided with partly seethe with excitement oblique flat combined fire grate and spiral of staged and raise rice husk, sawdust, the straw burning energy device of the circumference chamber structure of chaff device feeding port, end blower fan mouth.

At present, combustion apparatus such as known rice husk generally are to adopt jejune combustion technology flat, oblique various fire grate, and its burner hearth carbon distribution height, combustion rate are low, and smoke dust discharge concentration is more high, the efficient development and utilization of China's agricultural straw energy that is far from suitable.

The objective of the invention is: after the straw chopping chaffization, be fed into the mechanical force spiral and realize within the half boiling burner hearth thoroughly burning and NOx reduces discharging, purifies the purpose of the energy-conserving and environment-protective of flue dust.

The object of the present invention is achieved like this: in the burner hearth of side, circle structure, the material inlet that spiral is raised the chaff device is offered on the top of one side or plurality of side, in mouthful in the thorax every correspondence establish the oblique flat combined fire grate of staged half ebullated bed and (tiltedly establish on the row and stick up mouth, hole, ditch bar ladder, the ladder combination is passed to be under the mistake to spare and is established vertical wind distributing hole, ditch, mouth or put down arc air port, the ditch fire bars combined type that blows into perpendicular, the flat raft bed is the conventional fire grate of flat, bar structural formula), row is down end wind thorax and establishes vertical clapboard and the air distribution inside door; Be corresponding back side wall on the fire grate or be provided with resistance cigarette bank, what bank divided into that high pressure returns dirt blower fan leader tape returns dirt mouth (mouthful circumscribed outer secondary wind Roots blower of body of heater that is connected to), mouthful lead to come the ash disposal mouth of the outer dust arrester of stove, and the flue collector branch before the outer dust arrester of stove there is tobacco blending gas to recycle smoke pipe again to lead to end blower fan tobacco blending and go.Like this, raising the chaff device when spiral of the present invention raises chaff to go into stove burning normal, it is descending constantly that the material of rice husk straw chaff then pushes away the stand along the oblique down gravity of combined fire grate, the shell chaff of being gone simultaneously is subjected to perpendicular wind hole again, mouth upwards air blast stream is half boiling shape burning, treat then to meet again when boiling is spread out the flat raft bed with the material of sedimentation burning the big wind-force thrust that makes progress, just be stacked in semi-boiling circulating bed it " sky " with the conflux strand of under resistance cigarette bank, taking advantage of a situation of dirt of returning of returning the outer dust arrester of stove on the dirt mouth, the boiling burner hearth had not only prevented air coefficient excessive of boiling but also had realized the boiling material of flue gas recycled hot blast, therefore coincidence has realized that in present low NOx combusting technology NOx reduces discharging and the outer circulation device for eliminating smoke and dust efficiently purifies flue dust and the raising efficiency of combustion develops simultaneously and the purpose of energy-conserving and environment-protective.

Owing to adopted such scheme, the present invention to realize the thorough burning of rice husk, straw and purify flue dust and purpose that NOx reduces discharging, will make positive contribution for the development of the energy resource apparatus and technology of China direct combustion straw.

The invention will be further described below in conjunction with Figure of description

Cut open (signal) front view among accompanying drawing a kind of embodiment of the present invention.

Among the figure 1, the spheroidal graphite cast-iron combined fire grate stick up the mouth ladder pass and make up vertical core, ditch, mouthful fire grate lath (or board-like vertical core mouth, ditch fire bars) be combined into the oblique flat raft ebullated bed of partly seething with excitement of end wind air blast (letter tiltedly fire grate or claim half ebullated bed); 2, the perpendicular wind hole of row's bar, mouth, ditch (the perpendicular air port of letter); 3, fixing (machinery) fire grate bar flat raft combination ebullated bed (simple flat raft bed); 4, electric screw is raised chaff burning pusher, material inlet (simple spiral is raised the chaff device); 5, dirt road, mouth (the dirt mouth is returned in letter) are returned in external deduster circulation; 6, the outer secondary wind jet negative pressure leader tape that blows hard of giving of row of holding concurrently returns the roots blower (the dirt blower fan is returned in letter) of dirt; 7, external is combination dust arrester (contracted division dirt device) in addition; 8, be connected to main induced draft fan (simple main induced draft fan) after the external deduster; 9, end thorax dispensing air and the cyclic high-temperature that presss from both sides tobacco blending gas draw in cigarette or the routine, the flue gas of low temperature air blast (or high temperature draws cigarette air distribution all-in-one), air dispensing machines (letter end blower fan); 10, air port, the end; 11, end wind thorax; 12, boiling burner hearth; 13, operation fire door; 14, be the perpendicular road of ash disposal (the perpendicular grey-way of letter) with the thermal cycle pot; 15, fire-resistant block resistance plume protrudes furnace wall bank (letter resistance cigarette bank); 16, burner hearth overdoes, exports (simple burner); 17, hanger; 18, the brick or cast furnace wall (simple furnace wall) of refractory ring; 19, alumina silicate heat-insulation layer (simple heat-insulation layer); 20, air distribution take part in Taoism (simple air distribution road); 21, end thorax actuating doors; 22, every thorax allotment air distribution inside door (simple air distribution inside door); 23, flue collector; 24, the heat of heat-conducting work medium (water, gas, oil) cyclic system is imitated pot system (letter pot system); 25, height cigarette temperature is called flue tube door, lock (cigarette door lock is transferred in letter); 26, pull ash-containing plate; 27, body of heater; 28, working medium overcurrent cooling holder bank pipe (Jian Tuokan pipe); 29, material inlet; 30, base plate; 31, deduster smoke inlet; 32, flue gas recirculation smoke pipe; 33, bed comb beam; 34, flue gas flow auxiliary induced draft fan (simple auxiliary induced draft fan).In the accompanying drawings, within the body of heater 27 of round, square body, middle part boiling stockhole is cavity and establish furnace wall 18 week up and down, depend on holder bank pipe 28 handicapping cigarette banks 15 thereafter, front upper part is opened laterally outer material inlet 29 (mouthful 29 raise chaff device 4 in body 18 peripheral hardware spirals), mouthfuls 29 tiltedly establish fire grate 1, tiltedly establish combination flat raft bed 3 in position, a back lower bottom part to lower raft 30, constitute the boiling burner hearth 12 of end wind thorax 11 (establish dividing plate in the thorax 11 and open air distribution inside door 22) and the exhausted large space in top under 13 of the row; The outlet 16 that overdoes of logical blow-on thorax is gone up on thorax 12 top, and mouthful 16 butt joint pots are 24; Pot is that 24 tails have flue collector 23, when road 23 feeds the smoke inlet 31 of the outer dust arrester 7 of stoves and logical the establishing of tobacco blending transfer cigarette door lock 25 to insert end blower fans 9; Machine 9 connects the air port, the end 10 of wind thorax 11 front portions, the end.

Claims (5)

1. the semi-boiling circulating bed dust removing combustion returning combustion furnace of straw brans such as helical feeding paddy hull, have spiral and raise side, circle moulding formulas such as chaff device (24), it is characterized in that: half ebullated bed (1) that makes up with oblique fire grate (1) and flat raft bed (3) is its function center, bed (1) is gone up and is boiling burner hearth (12), thorax (12, back furnace wall (18) handicapping cigarette bank (15), wall 18 logical peripheral hardwares under the bank 15 return dirt mouth (5), and mouthful (15) are logical joins the external dust arrester of secondary wind formula leader tape (7) institute laying dust ash by returning dirt blower fan (6); Bed (1) is end wind thorax (11) down, establishing wind inside door (22) in the corresponding row of thorax (11) (1) bed (3) two districts, and air port, the end (10) is opened in the front portion, and the common boiling half boiling ring by flue gas recirculation flue (32) tobacco blending and air distribution road (20) that mouthful (10) external end blower fan (9) draws the flue gas recirculation flue (32) of flue collector (23) through transferring cigarette door lock (25) and coming with auxiliary induced draft fan (34) tobacco blending follows that straw bran also combines the combustion furnace structure of returning grey machine (6) leader tape air distribution clean combustion on bed (1) of bed.

2. combustion furnace according to claim 1, its concrete feature is: said oblique fire grate (1) is to be provided with the perpendicular air port (2) of vertical air blast and whenever to stick up mouth vertical core, ditch, mouthful platform step fire bars by hole, ditch, pig's tongue, row's combining structure of passing declivity.

3. combustion furnace according to claim 1, its concrete feature is: return the passage of the outer straight-through external dust arrester (7) of ash mouthful (5) and return dirt blower fan (6) along what incision had a secondary wind jet flow negative pressure leader tape principle.

4. combustion furnace according to claim 1, its concrete feature is: air port, the end (10) by end blower fan (9) with organic in the secondary wind that returns dirt blower fan (6), flue gas recirculation flue (32) accents cigarette door lock (25) and join to come flue collector (23) flue gas, the given minimum of air " approximating 1 " give the wind coefficient and on half ebullated bed (1) the chaff straw and half Boiling Combustion principle of the outer circulation smoke abatement and dust control of the straw energy that comes realization low NOx combustion.

5. combustion furnace according to claim 1, its concrete feature is: be provided with resistance cigarette bank (15), bank (15) is tucked in down the special structure of opening the back furnace wall (18) that returns dirt mouth (5).

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