CN203286559U

CN203286559U - Double-discharging coal feeding device of CFB (Circulating Fluid Bed) boiler

Info

Publication number: CN203286559U
Application number: CN201320107849XU
Authority: CN
Inventors: 韩丁; 石秀书; 胡晓安; 袁伟; 石福渠; 张弛
Original assignee: DATANG WU'AN POWER GENERATION Co Ltd
Current assignee: DATANG WU'AN POWER GENERATION Co Ltd
Priority date: 2013-03-08
Filing date: 2013-03-08
Publication date: 2013-11-13
Anticipated expiration: 2023-03-08

Abstract

A double-discharging coal feeding device of a CFB (Circulating Fluid Bed) boiler comprises a cylindrical coal bunker, wherein a section of inverted cone is connected with the lower part of the cylindrical coal bunker; a small cone is uprightly arranged in the inverted cone; rotating arms are slantly arranged at discharging openings; rotary feeding machines are arranged on discharging pipes which are communicated with the discharging openings; after pressure on coal in the cylindrical coal bunker is reduced by the small cone, the coal is discharged from the two discharging openings through automatic flow and a pushing force of the rotating arms; each rotary feeding machine has the functions of constant feeding and preventing the discharging pipes from being blocked by coal. According to the double-discharging coal feeding device, the height of a coal bunker bay is lowered; the occupied space and the investment are reduced; the problem that the cylindrical coal bunker and a feeding opening are blocked by coal is solved; when coal types vary, the double-discharging coal feeding device can adapt to the variability of the coal types, especially the coal types high in viscidity; the coordination between constant coal feeding and a weighing coal feeder is realized.

Description

The double material coal feeder of a kind of CFB boiler

Technical field

The utility model relates to a kind of CFB boiler coal feeding chamber structure, particularly the double material coal feeder of a kind of CFB boiler.

Background technology

The coal resources of China are relatively abundant, and its reserves account for 90% of national mineral resources reserves, and 95% of fossil energy has huge resource potential.And the Chinese coal great variety of goods, all have distribution from brown coal to the anthracite.The coal utilization of China is take burning as main, and the coal supply system mode of coal mouth under the corresponding list of single coal bunker has been adopted in coal-fired utilization (comprising coal-powder boiler, CFBB) bar none in thermal power plant.Adopt tower silo to add the reverse taper coal bunker, accompany by the anti-block apparatus such as loosening machine, vibrator, air bubble, by coal lock gate hatch start and stop coal supply.The advantage of this system layout mode is that coal supply system is simple, easily design arrangement.Shortcoming is to have the phenomenon of wall built-up chute blockage for the high coal of outer water, single lower coal mouth exists cone angle large simultaneously, give the bunker bay height large, construction investment is also large, and tower silo adds that reverse taper coal bunker height is high, space availability ratio is low, investment is large, material stops up, the yielding card plucked instrument of lock gate hatch etc.

Scientific and technical personnel had developed center feeder in recent years, and it has cancelled the cone section of coal bunker, adopted flat-bottom bin, accompanied by the center feeder coal supply, and this respect reduces the height of bunker bay, has saved investment.Secondly, solve aspect chute blockage its adopt the discharging wall by the internal friction of coal by center material inlet coal supply.There is the problem of following four aspects in actual applications in this center feeder: one, feeder sealing air pressure head is large, and rotation discharging system sealing is difficult, causes discharge system to draw phenomenon bad and that burn motor.Two, poor to coal adaptability,, when coal viscosity is large, when sticking wall is very strong, can form a coal seam in bottom, discharge system is damaged.Three, discharge system measures with volume flow, and it is difficult to coordinate with Gravimetric Coal Feeders.Four, in servicely exist poorly sealed, rotating mechanism to damage and center feed and belt coal-feeding machine such as do not mate at the problem, the most fatal is when the coal total moisture surpasses 10%, can form sticking coal seam in the coal bunker bottom, turning arm has been hanged, scraping the coal ability descends, and then the reduction of exerting oneself, can not meet normal service requirement.

Summary of the invention

In order to overcome the defect of above-mentioned prior art, the purpose of this utility model is to provide a kind of CFB boiler double material coal feeder, reduces the bunker bay height, saves space and investment; Solve the chute blockage problems such as coal bunker and material inlet; When coal is changeable, can adapt to the polytropy of coal, particularly for tough coal; Can realize that quantitative coal supply is connected cooperation with Gravimetric Coal Feeders.

In order to achieve the above object, the technical solution of the utility model is:

The double material coal feeder of a kind of CFB boiler, comprise cylinder coal bunker 1, cylinder coal bunker 1 bottom connects one section reverse taper 2, the interior forward of reverse taper 2 is provided with bocca 3, two forward and reverse reverse taper 2 bottom outside that are arranged on of cone form two discharging openings, discharging opening is tiltedly installed with turning arm 4, is provided with rotary feeder 6 on the discharge duct 5 that is connected with discharging opening, and turning arm 4 and rotary feeder 6 drive by the motor 7 that is arranged at the bottom of storehouse.

Characteristics of the present utility model are:

1, arrange bicone in coal bunker, the bocca decompression, bottom, large cone-shaped coal-forming storehouse, coal is good by the flow by gravity characteristic.

2, the rotary thrust arm is in tilted layout, and thrust is larger, and feed, blocking-proof result are better.

3, coal flows to drainage conduit by turning arm thrust and gravity, arranges rotatory feeder valve in drainage conduit, realizes automatically, quantitatively without the chute blockage feed.

4, two material inlets are connected with follow-up feeder, have reduced 50% chute blockage accident.

5, the coal bunker bottom design and with rotation the coordinating of unloading arm,, even the realization moisture content of coal increases to 10% when above, still can realize not chute blockage.

Description of drawings

Accompanying drawing is structural representation of the present utility model.

The specific embodiment

Below in conjunction with accompanying drawing, structural principle of the present utility model and operation principle are described in detail.

Cylinder coal bunker 1 of the present utility model adopts the steel tower silo, and in storehouse, wall liner adopts corrosion resistant plate or high polyvinyl chloride panel, for making coal, discharges smoothly, adopts the rotation unloading arm, and turning arm 4 is in tilted layout, and makes coal lean on the thrust of gravity and unloading arm to flow to discharging opening.Discharge duct 5 prevents that by the rotatory feeder valve of rotary feeder 6 discharge duct 5 from preventing and the obstruction at feeder connector position, can realize the sealing of rotary system part and the effect of start and stop feed simultaneously.

Operation principle of the present utility model: after the coal in cylinder coal bunker 1 is reduced pressure by bocca 3, thrust by gravity flow and turning arm 4 is discharged coal bunker with it by two discharging openings, arrange rotary feeder 6 on discharge duct 5, rotary feeder 6 has the function of dosing and anti-discharge duct 5 chute blockage.

Changed the structure of former cone coal bunker or flat-bottom coal bunker due to the utility model, changed two discharge gates into by single discharge gate, provide that a kind of spatial altitude utilization rate is high, floor space is little, construction costs is low, guaranteed coal bunker and discharge duct not coal bunker and the feed-type of chute blockage.Cone is set in coal bunker, has reduced the possibility that the coal bunker coal is put up a bridge.Coal is discharged by discharge duct by the thrust of deadweight and turning arm, and turning arm is arranged in large cone segments, has effectively eliminated wall sticking phenomenon, and has increased the downward thrust of coal.Solved the chute blockage problem of coal in coal bunker.In coal bunker bottom, two discharge gates are set, and rotary feeder is set on drainage conduit, rotary feeder can be eliminated in discharge duct and the chute blockage problem of feeder porch, and rotary feeder can dosing simultaneously, with belt coal-feeding machine, mates.Belt coal-feeding machine sealing air pressure is large, and rotary feeder can be realized material sealing, has solved the center feeder sealing bad, the problem of drawing bad equipment.Use this moulded coal chamber structure and prevent blocking of coal bunker batcher, can effectively solve the problem of coal bunker and coal-feeding tube chute blockage, boiler, because disconnected coal blowing out accident rate reduces greatly, has improved the boiler availability coefficient.

Claims

1. double material coal feeder of CFB boiler, comprise cylinder coal bunker (1), it is characterized in that, cylinder coal bunker (1) bottom connects one section reverse taper (2), the interior forward of reverse taper (2) is provided with bocca (3), two forward and reverse reverse taper (2) bottom outside that are arranged on of cone form two discharging openings, discharging opening is tiltedly installed with turning arm (4), be provided with rotary feeder (6) on the discharge duct that is connected with discharging opening (5), turning arm (4) and rotary feeder (6) drive by the motor (7) that is arranged at the bottom of storehouse.