CN201565344U

CN201565344U - Improved belt coal feeder

Info

Publication number: CN201565344U
Application number: CN2008201794840U
Authority: CN
Inventors: 石福军
Original assignee: 石福军
Current assignee: Jingyuan No.2 Electricity Generating Co., Ltd.
Priority date: 2008-12-02
Filing date: 2008-12-02
Publication date: 2010-09-01
Anticipated expiration: 2018-12-02

Abstract

The utility model provides an improved belt coal feeder, which belongs to the technical field of automatic coal supply devices generally adopted in the present coal-fired power stations and used for supplying raw coal for coal pulverizers, and aims to clean up coal particles and coal dust which are accumulated during the operation of the coal feeder. The belt coal feeder comprises a bottom plate adopting the structure of an inclined plane with a certain inclination, and solves the problems that power consumption, chain and scrapping plate abrasion and electrical and mechanical failures are caused due to the adoption of a chain cleaning scrapping plate mechanism of an electric weighing belt coal feeder in the prior art. Besides, in order to reduce coal dust leak, to dry raw coal and to improve the weighing accuracy of the coal feeder, for a medium-speed coal pulverizer, the casing seal of the coal feeder is changed into the seal at a coal supply pipe outlet in the medium-speed coal pulverizer, that is, a section of thicker pipe is welded at the end part of the coal supply pipe positioned in the machine body of the coal pulverizer. Mixed primary air enters a seal air room through a seal air pipe; and the upper end of the seal air room is inclosed, the lower end is tapered, and the opening is over against a bowl mill.

Description

Modified belt-type feeder

One, affiliated technical field

The utility model relates to the automatically coal feeding device for coal pulverizer supply raw coal that a kind of current coal-fired power plant generally adopts.

Two, background technology

At present, widely used electronic-weighing belt-type feeder is made up of support, feeding belt mechanism, Weighing mechanism, chain type cleaning scraping plate mechanism, chute blockage and disconnected coal recoil simulator, lubricating pipe, electric and microcomputer control cabinet and power supply power cabinet etc.

One, when feeder moved, the coal that bonds on the adhesive tape scraped by the belt cleaning balde; The adhesive tape inboard then by behind the self-cleaning belt tensioning drum, is fallen by the cylinder end face if any adhering to coal ash; The existence of sealing wind also can make coal ash produce.These coal ash all accumulate in the bottom of feeder body, as untimely removing, often might cause spontaneous combustion, even can hinder the normal operation of feeder belt.Therefore, the feeder design has a cover chain scraper cleaning system, is used to clear up the long-pending coal of feeder organism bottom.Flight chain drives sprocket wheel by motor by reductor and drags, and the chain of the band wing scrapes coal ash to feeder outlet discharge.The problem that exists is: clearing apparatus itself is understood because of machinery, electric or control system fault take place influences the normal operation of feeder; Clearing apparatus need consume electric power; Galling can take place in chain, scraper plate and feeder base plate.

Its two, the mechanical seal of feeder own is reliable, can think do not have to leak.Yet in pressurized direct pulverizing coal system, feeder design sealing wind action is that the coal dust that stops wind of mixing of higher temperature to carry in the coal pulverizer is oppositely scurried into feeder along the feeder outlet, causes feeder obstruction, organism temperature rising, inner accumulated powder spontaneous combustion etc.The program that pulverized coal preparation system is stopped transport is to stop feeder earlier, after stop coal pulverizer.Maintenance situation from all previous feeder, the inner more serious accumulated powder (due to the interior coal dust blowback of mill) that exists of feeder, need take a long time and clear up, thereby the on-stream time of having postponed the feeder maintenance, increased personnel labor intensity and power consumption (high-power industrial dust collector power consumption).In addition, in service at feeder the disconnected coal of coal pulverizer because the sticking coal of run coal bin often takes place, the coal dust in the coal pulverizer can be along the hole that is formed centrally in the coal bunker directly by blowback between coal conveyer belt.As seen feeder sealing wind can not play sealing function fully under special operation condition, and feeder is on the contrary owing to the operation of band blast, and ubiquity leaks the powder phenomenon; Feeder running platform dust content is bigger, and equipment and ground health are difficult to keep.Feeder feeds sealing wind, also can influence its weighing precision.If the sealing air amount that feeds is excessive, in body, can produce bigger coal dust, the operation conditions that is difficult to observe the coal supply belt from peep hole; Sealing wind also can blow off coal from belt, increased the cleaning work amount.

Three, utility model content

The technical problems to be solved in the utility model provides a kind of less wear, fault-free, can not power consumption and discharge the feeder of housing inner product coal automatically and continuously, and this feeder enclosure interior is not born sealing air pressure, can realize not having foreign material cleaning in leakage operation and pulverized coal preparation system gravity flow sampling, the raw coal, coal charge recovery.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of modified belt-type feeder comprises feeder base plate, feeder filter screen, dustproof overhead gage, dustproof lower baffle plate, chute blockage signal detection baffle plate, support, sealing device.It is characterized in that the feeder base plate is the ramp structure with certain gradient, the feeder coal dust that gathers in service can be at it under the effect of gravity, and the frictional force that overcomes with the inclined-plane enters coal pulverizer from flowing to the feeder discharging opening.Therefore the chain type of prior art feeder cleaning scraping plate mechanism and driving motor thereof and reductor should be removed.

Sealing device is positioned at the coal-feeding tube exit of medium-speed pulverizer, no longer feeds sealing wind in the feeder housing.Specifically one section thicker pipe has been welded in the coal-feeding tube end in the medium-speed pulverizer body exactly, mixes a wind and enters the sealing air compartment by sealing air pipe; Sealing air compartment upper end closed, lower end convergent, opening are over against petty bowl.

Further, dustproof overhead gage and the dustproof lower baffle plate that is connected with the body both sides is installed,, reliable mechanical type feeder chute blockage signal detection baffle plate is installed at tapping 2～3 of the appropriate location perforates of dustproof overhead gage at the feeding belt output.

Further, there are feeder filter screen, this filter screen to pass through the gap of preventing dust between overhead gage and the dustproof lower baffle plate in the design of feeder discharge end.

The utility model compared with prior art has following beneficial effect:

1, because the cancellation of chain scraper cleaning system is simplified the structure of current feeder, and component number significantly reduces, and wearing and tearing reduce, and the cost of feeder, maintenance cost reduce, operational reliability improves.

2, as long as feeder stops into coal, the coal on the belt is walked sky, and gathering of a large amount of coal grains, coal dust can not taken place in the feeder housing again, and the internal work environment of a cleaning also is provided for the maintenance of feeder simultaneously, makes the minimizing that contacts of maintainer and coal dust.

3, the feeder housing no longer bears blast one time, is atmospheric pressure state, thereby can prevent the leak-stopping powder and improve the weighing precision of feeder; Also be the optimal design of the on-line measurement of pressure tube cell and the sampler condition of providing convenience, in the time of can realizing many tube cells of pressurized direct pulverizing coal system etc., gravity flow, closed sampling (not shown), thereby but several times ground improves the sampling operating efficiency, obtains having more the test data of directive significance.

4, can reduce coal supply system operation power consumption; Feeder overhauls equipment such as need not to employ industrial dust collector again and clears up, also can saves energy.

5, other additional windfall of the utility model:

A. owing to designed dustproof overhead gage and dustproof lower baffle plate at the feeder output, feeder chute blockage signal detection baffle plate is installed in perforate on dustproof overhead gage, can improve feeder chute blockage protection accuracy of action, reliability greatly.

B. can adopt in coal pulverizer raw coal inlet place and mix a wind sealing, mixing a wind is hot blast, can strengthen the drying to raw coal, is beneficial to improve the coal pulverizer milling efficiency.

C. owing to the increase of feeder discharge end height and the increase in space, the feeder filter screen can be set, further foreign material such as the wooden stick in the Ex-all raw coal, ironware, woven bag.Because no blast in the feeder carries out the recovery that foreign material are cleared up or trickled down the coal grain at the feeder foreign material cleaning door (in the suitable position redesign, not shown) of can directly opening in service.

Four, description of drawings

Fig. 1 is the structural representation (front view) of prior art belt-type feeder;

Fig. 2 is the structural representation (front view) of the utility model belt-type feeder;

Fig. 3 is based on medium-speed pulverizer raw coal inlet sealed structural representation of the present utility model;

Fig. 4 is the design profile figure of sealing device among Fig. 3.

Among the figure: 1-feed end door, 2-belt tensioning drum, 3-charging aperture, 4-tension roller, the defeated material of 5-belt, 6-head roll, 7-discharge end door, the import of 8-sealing air, the 9-tightener sprocket, 10-clears up scraper plate, 11-discharging opening, 12-drive sprocket, 13-chute blockage signal detection baffle plate, the 14-overhead gage that prevents dust, 15-feeder filter screen, the 16-lower baffle plate that prevents dust, the 17-support, 18-coal-feeding tube, 19-sealing air pipe, 20-sealing device, 21-feeder base plate, 22-seals air compartment, the petty coal machine of 23-inner cone.

Five, the specific embodiment

As shown in Figure 2: a kind of modified belt-type feeder comprises feeder base plate (21), feeder filter screen (15), dustproof overhead gage (14), dustproof lower baffle plate (16), chute blockage signal detection baffle plate (13), support (17), sealing device (20).Feeder base plate (21) and level ground angle α ≮ 40 °; Dustproof overhead gage (14) is positioned at the feeding belt output with dustproof lower baffle plate (16) and is connected with the body both sides; Support (17) firmly supports the feeder body, and feeder switch board etc. can be fixed on the support.

Referring to Fig. 3, Fig. 4: sealing device (20) is positioned at the exit of the coal-feeding tube (18) of medium-speed pulverizer, promptly welded one section thicker pipe in the end of coal-feeding tube (18), form a sealing air compartment (22), sealing air compartment upper end closed, lower end convergent, opening are over against petty bowl; Mix a wind and enter sealing air compartment (22) by sealing air pipe (19).The inlet of coal-feeding tube (18) is connected with feeder discharging opening (11).Sealing air pipe (19) should meet the support requirement to coal pulverizer inner cone (23) passing through coal pulverizer inner cone (23) wall place.The sealing air import (8) of prior art feeder will be cancelled.

As of the present utility model further perfect, referring to Fig. 2: the appropriate location at dustproof overhead gage (14) has 2～3 holes, at this reliable mechanical type feeder chute blockage signal detection baffle plate (13) is installed, on the feeder housing, offers the peep hole (not shown) that can observation signal detects baffle plate (13) action situation.

As of the present utility model further perfect, referring to Fig. 2: feeder filter screen (15) passes through the gap between dustproof overhead gage (14) and the dustproof lower baffle plate (16), and the mesh of feeder filter screen (15) should be able to guarantee to design material granularity by coal breaker, and (≤25mm) coal grain can pass through smoothly.The spacing of dustproof overhead gage (14) and dustproof lower baffle plate (16) is got 250～300mm, so that the bulk foreign material can directly be rolled to the dustproof baffle plate outside along feeder filter screen (15).

As of the present utility model further perfect again, stagnant at doorframe or other convex-concave positions in order to prevent coal dust, compressed air scavenging pipeline (not shown) reasonable in design is answered in feeder inside, regularly carries out internal sweep; Purge and also can be used as a preceding self-care measure execution of feeder maintenance.

The utility model relates to the buildup cleaning and the sealing device transformation of prior art belt-type feeder can distinguish independent enforcement.

Claims

1. modified belt-type feeder, comprise feeder base plate, feeder filter screen, dustproof overhead gage, dustproof lower baffle plate, chute blockage signal detection baffle plate, support, sealing device, it is characterized in that the feeder base plate is the ramp structure with certain gradient, has carried out firm support with support to the feeder body.

2. modified belt-type feeder according to claim 1 is characterized in that one section thicker pipe has been welded in the coal-feeding tube end in the medium-speed pulverizer body corresponding with feeder, mixes a wind and enters the sealing air compartment by sealing air pipe; Sealing air compartment upper end closed, lower end convergent, opening are over against petty bowl.

3. modified belt-type feeder according to claim 1 is characterized in that at the feeding belt output dustproof overhead gage and the dustproof lower baffle plate that is connected with the body both sides being installed; 2～3 of the appropriate location perforates of dustproof overhead gage, reliable mechanical type feeder chute blockage signal detection baffle plate is installed at tapping.

4. modified belt-type feeder according to claim 1 is characterized in that having feeder filter screen, this filter screen to pass through the gap of preventing dust between overhead gage and the dustproof lower baffle plate in the design of feeder discharge end.