CN2044687U

CN2044687U - Pretreetment equipment for grate-fired coal

Info

Publication number: CN2044687U
Application number: CN 89201191
Authority: CN
Inventors: 金并; 王作铭; 黄学成
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-01-25
Filing date: 1989-01-25
Publication date: 1989-09-20

Abstract

The utility model relates to pretreatment equipment for grate-fired coals of industrial boiler and other furnaces, which is composed of a chassis (1), a generator (2), a transmission mechanism (3), a delivery device (4), a screening device (5), a storing device (6), a sprinkling humidifying device (7) and a roll-off granulating device (8), etc. The treating equipment can first screen the primary coals which are sent to the boiler for being burned, and the screened shred coals are made to miliarily molded coals which are sent with the screened lump coals to the boiler for being burned. Thus, the burned calorific efficiency is not only improved but the air pollution is also lightened.

Description

Pretreetment equipment for grate-fired coal

The utility model relates to a kind of burning of coal technology.The stokehold preliminary treatment of coal when being mainly used in grate firings such as Industrial Boiler and other industrial furnaces with raw coal or system coal.

At present, industrial boilers in China and the general used coal of stove layer combustion are raw coal or coal under the unified ration system without dressing of coal by washing, and this coal particle is greatly different in size, and the fines ratio is quite high, and the fines of general granularity＜3mm surpasses 50%.Because ickings is too much and too thin, the increase of fire grate coal leakage rate, the fuel assembly layer is closely knit, and resistance is big, ventilative poor, and it is slow fire burns, and the combustion layer is abundant inadequately, ash content carbon is high, and the unburnt heat loss of solid is bigger.Simultaneously, because the ickings smalls is too much, the flying dust amount increases, and discharges a large amount of flue dust and SO _X, NO _XDeng pernicious gas, caused China's atmosphere pollution.

For this reason, Chinese patent CN86102302A has announced " a kind of chain furnace grate combusting device " patent.This patent is provided with the briquetting roll in the coal bunker bottom, and the bits coal that enters coal bunker is sent into the stove internal combustion after roll is rolled into coal briquette.Because through the rolling coal briquette of making, any surface finish, structure are closely, gas permeability is poor, thereby the thermal efficiency is lower.

In view of the problem of above-mentioned existence, the purpose of this utility model provides a kind of grate firing coal pre-processing device that can improve the boiler layer coal thermal efficiency.

Concrete structure of the present utility model is by providing in the accompanying drawing:

Fig. 1 is a structural representation of the present utility model

Fig. 2 is the structural representation of the utility model roll

For the ease of understanding the utility model, be elaborated below in conjunction with the embodiment that provides in the accompanying drawing:

Grate firing is a complete coal pretreatment system with the coal pre-processing device, the motor of this pre-processing device (2), transmission device (3), conveying device (4), separating screen device (5), storage device (6), spray damping device (7), roll off prilling granulator (8) be installed on that a common chassis (1) is gone up or dolly on.It can be fixedly mounted on the boiler preceding coal bunker or coaling machine as required.Also can move with dolly, be arranged in boiler room and coal yard conveyer before.Set conveying device (4) in the pre-processing device---bring the vertical screw elevator of hopper into, with raw coal sorting just, promote, be delivered to separating screen device (5), behind sub-sieve, the lump coal of＞6mm can be burnt directly into stove, the bits coal of＜6mm then enters storage device (6) And and adjusts its moisture content (mixing with desulfurizing agent in case of necessity) through spray damping device (7), water spray or spraying, through roll off prilling granulator (8), behind the roll off molding, granulating, with branch sift out＞after the lump coal of 6mm mixes, advance the stove burning again.

Be surface roughness and the burning contact-making surface that improves the roll off molding, granulating, the surface design of a roll of roll off prilling granulator (8) becomes to have the grooving (10) of hoop, the surface design of another root roll becomes axial grooving (11), perhaps the forming tank of two granulation rolls is made any cross one another angle, two roll rollings relatively in opposite directions, roll into the plate of chocolate shape, be split into the moulded coal of Chinese chestnut shape then.The granularity of this Chinese chestnut shape moulded coal is no more than 25mm, and the plane of disruption is arranged all around, be easy to catch fire, and granulation continuously again, production efficiency is higher.

Improve the service life of granulation roll for adapting to different industrial furnaces for the And that requires of different grain size moulded coal, on roll off prilling granulator (8), be provided with the centering type governor motion (9) that to regulate two roll centre-to-centre spacing, surface and die cavity wearing and tearing simultaneously two granulation Roller Design become inserted tube-in-tube structure, in case only need be changed roll outer sleeve format roll, can reuse, thereby reduce its use cost.

Use the utility model can not only make the grate firing coal of present Industrial Boiler and other conventional oven kilns; change into the particulate coal that uses through preliminary treatment processing by containing the bits raw coal in a large number; fundamentally improved China's grate firing and gone into the stove state with coal; reached the raising efficiency of combustion; the purpose that energy savings consumes; and fundamentally reduced flue dust and discharge of harmful gases, protected environment.

Claims

1, a kind ofly be used for the grate firing coal pre-processing device that Industrial Boiler and other industrial furnaces use raw coal or system coal, it is characterized in that this pre-processing device motor (2), transmission device (3), conveying device (4), separating screen device (5), storage device (6), spray damping device (7), roll off prilling granulator (8) is installed on a common chassis (1) or the dolly.

2, grate firing according to claim 1 coal pre-processing device is characterized in that conveying device (4) is vertical screw elevator.

3, grate firing according to claim 1 coal pre-processing device, the surface that it is characterized in that a roll of roll off prilling granulator (8) has hoop grooving (10), another roller surface has axial grooving (11), and during work, two rolls are made relative move toward one another.

4, grate firing according to claim 1 coal pre-processing device is characterized in that the forming tank of two granulation rolls of roll off prilling granulator (8) may be made in any cross one another angle, to change the shape of Chinese chestnut shape moulded coal.

5, grate firing according to claim 1 coal pre-processing device is characterized in that its roll off prilling granulator (8) is provided with one and can regulates the centering type governor motion (9) of two roll centre-to-centre spacing.

6, grate firing according to claim 1 coal pre-processing device, the roll that it is characterized in that its roll off prilling granulator (8) is inserted tube-in-tube structure.