CN216988472U - Filter screen for cleaning buffer hopper inlet of slag dryer series connection chain - Google Patents

Abstract

The utility model discloses a filter screen for a buffer hopper inlet of a cleaning chain of a slag dryer in series connection, which comprises a cleaning chain head part outlet short section, a buffer hopper and a slag discharge pipe, wherein the filter screen is in a rectangular flange type, is arranged between a lower flange of the cleaning chain head part outlet short section and an upper flange of the buffer hopper and is connected with the periphery of the buffer hopper through detachable bolts, a longitudinal long circular hole is designed on the filter screen, the direction of the hole is arranged according to the ash conveying direction of the cleaning chain, and the length of the hole is based on that a steel belt machine lug plate cannot pass through the hole. The filter screen prevents large slag, steel belt lug plates, welding rods, iron wires and the like from blocking the ash pipe, reduces the impact and abrasion of the ash pipe on downstream equipment and pipelines, improves the reliability and the service life of the equipment, reduces the maintenance cost, and is of great importance to the normal operation of a unit.

Description

Filter screen for cleaning buffer hopper inlet of slag dryer series connection chain

Technical Field

The utility model relates to a dry air-cooled slag conveyor, in particular to a buffer hopper at an outlet of a cleaning chain of a steel belt machine of the slag conveyor.

Background

The slag discharge at the bottom of the furnace adopts an air-cooled slag removal system, each furnace is provided with a set of dry air-cooled slag conveyor, a slag crusher and a secondary air-cooled slag conveyor to directly convey slag to a slag bin, the two furnaces are provided with a steel structure slag bin together, and the horizontal length from the center of the boiler to the existing slag bin is 45.75 m. Due to the limitation of field space, the angles of the first-stage cleaning chain and the second-stage cleaning chain of the steel belt machine are larger than the conventional design values (29.5 degrees of a first-stage steel belt and 38.5 degrees of a second-stage steel belt), the dust accumulation of the lifting section is easy to cause, the cleaning chain scraper is directly buried by dust when the dust amount is large, the rubber of the cleaning chain scraper is seriously worn, and the newly replaced cleaning chain scraper rubber in the unit maintenance can only be used for 3 months. After the cleaning chain scraper rubber is worn, the dust scraping capacity is poor, in order to prevent dust deposition, the cleaning chain scraper jacks up an upper chain and a lower chain to be wound and damaged, a box body air door needs to be opened to suck dust, so that air leakage at the bottom of a furnace is large, the flame center of a hearth is caused to move upwards, the overtemperature and the temperature reduction water quantity of a reheater are large, the exhaust smoke temperature is increased by about 3 ℃, and the boiler efficiency is reduced.

Afterwards, the cleaning chains of the first and second levels are reformed, a series structure is adopted, a buffer hopper is arranged below the head of the cleaning chain, and materials enter a pneumatic conveying pump through an ash discharge valve and are conveyed to a slag bin through positive pressure. The ash slag conveyed by the series cleaning chain often carries slag blocks, the particle size is large, foreign matters such as welding rods in a hearth and lug plates dropped by a steel belt machine sometimes exist, an ash pipe is blocked during pneumatic conveying, a filter screen is specially arranged at the inlet of the buffer hopper, and the problems are effectively solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a filter screen for a buffer hopper inlet of a cleaning chain of a slag dryer in series connection, which prevents large slag, steel belt ear plates, welding rods, iron wires and the like from blocking an ash pipe, reduces impact and abrasion on downstream equipment and pipelines, improves the reliability and service life of the equipment, and reduces maintenance cost.

The utility model has the technical scheme that a filter screen for a cleaning chain buffer hopper inlet in series connection with a slag dryer comprises a cleaning chain head outlet short section, a buffer hopper and a slag discharge pipe, and is characterized in that: the filter screen is rectangle flange formula, installs and is cleaned between chain head export nipple joint lower flange and the buffering fill upper flange, through dismantling bolt and connect all around, sets up the jetting pipe on cleaning chain head export nipple joint, and manual assistance cleans the deposition on the filter screen, and the design has vertical slotted hole on the filter screen, and the direction in hole is unanimous with the defeated grey direction of cleaning chain.

Furthermore, the inner surface of the lower plate of the slag discharging pipe is flush with the upper surface of the filter screen, so that larger slag blocks and foreign matters smoothly slide into the slag discharging pipe.

Furthermore, the included angle alpha between the filter screen and the horizontal plane is 28-32 degrees.

Furthermore, the bottom of the blowing pipe is uniformly provided with small blowing holes.

The utility model has the following beneficial effects:

1. when the boiler is in the stage of starting or other abnormal working conditions, the cleaning chain ash conveying device contains large slag blocks or hearth foreign matters, the filter screen can effectively intercept the foreign matters, the foreign matters can be conveniently cleaned through the adjustment of the angle alpha of the filter screen and the design of the slag discharge pipe, ash can effectively enter the buffer hopper, and the ash is discharged through pneumatic ash removal.

2. The ash amount is increased after the cleaning chains are connected in series, and the design and the arrangement of the filter screen prevent large slag, steel belt ear plates, welding rods, iron wires and the like from blocking the ash pipe, reduce the impact and the abrasion of the large slag on downstream equipment and pipelines, improve the reliability and the service life of the equipment, reduce the maintenance cost and are very important for the normal operation of the unit.

3. The filter screen has the dual functions of intercepting large slag blocks, foreign matters in the hearth and ash.

Drawings

FIG. 1 is a schematic flow chart of the structure of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is a diagram of a buffer hopper inlet screen.

Fig. 4 is a schematic view of an injection lance.

Fig. 5 is a sectional view a-a of fig. 4.

The reference numbers illustrate: the cleaning device comprises a primary cleaning chain 1, a secondary cleaning chain 2, a cleaning chain head 3, a head outlet short section 4, a filter screen 5, a buffer bucket 6, an expansion joint 7, a feed valve 8, a delivery pump 9, an ash conveying pipe 10, a slag discharge pipe 11, a long circular hole 12 and a blowing pipe 13.

Detailed Description

As shown in figure 1, figure 2 and figure 3, the filter screen for cleaning the inlet of the chain buffer hopper in series for the slag dryer provided by the embodiment is an inclined filter screen, the buffer hopper 6 is a square and round, so the filter screen 5 is of a rectangular flange type, and the installation position is that the lower flange of the outlet short section 4 of the chain head part is cleaned and the upper flange of the buffer hopper 6 are connected all around through detachable bolts and can be replaced during maintenance. A pin shaft type observation and inspection small door is arranged on the side surface of the head outlet short section 4, so that the accumulation and falling conditions of materials on the filter screen can be observed irregularly.

The filter screen material is the stainless steel, and is wear-resisting and smooth, according to the delivery capacity and the distribution of particle size class of lime-ash, designs vertical slotted hole 12 on the filter screen, and the downthehole wall does not have the burr, makes things convenient for the sediment ash to smoothly pass through. The length of the hole is based on the fact that the lug plate of the steel belt machine cannot pass through the hole. The thickness of the filter screen 5 is generally 5mm, and the included angle alpha between the filter screen and the horizontal plane is 28-32 degrees.

When the large slag blocks fall on the filter screen 5, the large slag blocks slide to the lower end along the upper surface of the filter screen and enter the slag discharge pipe 11 to be discharged. The inner surface of the lower plate of the square slag discharging pipe 11 is flush with the upper surface of the filter screen 5, so that larger slag blocks and foreign matters can smoothly slide into the slag discharging pipe 11.

As shown in fig. 4 and 5, the blowing pipe 13 is arranged on the cleaning chain head outlet nipple 4, so that the dust on the filter screen 5 can be cleaned manually in an auxiliary manner, and the cleaning effect is good.

The working process is as follows:

fine ash of a cleaning chain of the slag dryer is conveyed through a primary cleaning chain 1 and a secondary tandem cleaning chain 2, and directly falls into a buffer hopper 4 at the head part 3 of the cleaning chain; the entrance of buffering fill sets up slope flange formula filter screen 5, and the design has the slotted hole 12 of certain size through verifying on it, and the direction in hole is arranged according to cleaning chain ash conveying direction, can effectual interception big cinder, including structures such as steel band machine otic placode, welding rod, iron wire, and messenger's fine ash can fall smoothly. The fine ash is driven to enter the feeding valve 8 by the movement of the expansion joint 7, the feeding valve 8 is opened to enter the conveying pump 9, and the fine ash is conveyed to the slag bin through the conveying pipeline by adopting a positive pressure gas conveying system.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the scope of the present invention.

Claims (4)

1. The utility model provides a dry sediment machine series connection cleans chain buffering fill filter screen for entry, includes cleans chain head export nipple joint (4), buffering fill (6), scum pipe (11), characterized by: filter screen (5) are rectangle flange formula, install and clean chain head export nipple joint (4) down between flange and the buffer fill (6) the flange, through dismantling bolt connection all around, set up jetting pipe (13) on cleaning chain head export nipple joint (4), manual supplementary deposition that cleans on the filter screen, it has vertical slotted hole (12) to design on filter screen (5), the direction in hole is unanimous with the chain defeated grey direction of cleaning.

2. The filter screen for the inlet of the buffer hopper of the slag dryer serial cleaning chain as claimed in claim 1, which is characterized in that: the inner surface of the lower plate of the slag discharge pipe (11) is flush with the upper surface of the filter screen (5), so that larger slag blocks and foreign matters smoothly slide into the slag discharge pipe (11).

3. The filter screen for the inlet of the buffer hopper of the slag dryer serial cleaning chain as claimed in claim 1, which is characterized in that: the included angle alpha between the filter screen (5) and the horizontal plane is 28-32 degrees.

4. The filter screen for the inlet of the buffer hopper of the slag dryer serial cleaning chain as claimed in claim 1, which is characterized in that: and small air blowing holes are uniformly distributed at the bottom of the injection pipe (13).

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