CN2046976U

CN2046976U - High-temp. fume fluidised-bed furnace

Info

Publication number: CN2046976U
Application number: CN89200145U
Authority: CN
Inventors: 林志杰; 伍蔚垣; 陈汉平; 刘德昌
Original assignee: Huangshi Building Materials Energy Saving Equipment Factory; Huazhong University of Science and Technology
Current assignee: Huangshi Building Materials Energy Saving Equipment Factory; Huazhong University of Science and Technology
Priority date: 1988-12-31
Filing date: 1988-12-31
Publication date: 1989-11-01

Abstract

The utility model relates to a high-temperature fume fluidized-bed furnace used for baking materials. A secondary air system is added on the existing drying furnace, and the aperture ratio of the original primary grid plate is raised to 2.4-3.5%; simultaneously the aperture ratio changed structure is adopted, which enlarges the excess air ratio, realizes the heat balance in the furnace, strengthens the flow perturbation in the furnace, improves the two-phase mixing of the gas and the solid, and intensifies the firing; therefore, the heat efficiency is improved. The high-temperature fume fluidized-bed furnace can be used for the industries such as construction material industry, the chemical industry, the metallurgy industry, the light industry, etc.

Description

High-temp. fume fluidised-bed furnace

The utility model is about being used to dry the high-temperature flue gas fluidized bed furnace of material in the industries such as building materials, chemical industry, metallurgy, light industry, machinery.

Existing high-temperature flue gas fluidized bed furnace is mainly by the body of heater that has boiling bed, suspension section, burning chamber, hot exhanst gas outlet, coal supply system, and feed system, one time air inlet system is formed.Air is by pressure fan, through isobaric bellows, air distribution plate, blast cap enter in the stove, the fire coal of sending into coal supply system burns in the boiling mode, produce high-temperature flue gas, discharge from hot exhanst gas outlet through burning chamber then, enter drying plant, the oven dry material.The percent opening of its wind air distribution plate is generally less in existing fluidized bed furnace, just caused the actual intake of a wind too little, air intake for once only simultaneously, so excess air coefficient low (1.05～1.15) in its stove and can not realize heat balance, fluidisation (boiling) is of poor quality, and the heat that produces after the fuel combustion is difficult to be pulled away, be easy to generate overtemperature slagging scorification phenomenon, stable normal for keeping furnace temperature, realize heat balance, generally be forced to open wide the fire door burning, so just increased heat loss, the thermal efficiency of stove is reduced, also pollute the environment simultaneously.

The purpose of this utility model is to provide a kind of high efficiency high-temperature flue gas boiling at the problems referred to above for industrial production.

Fig. 3 is the main cutaway view of the utility model band six hole blast caps.

Fig. 4 is the attached view of the utility model band six hole blast caps;

Fig. 5 is the main cutaway view of the utility model band octal blast cap;

Fig. 6 is the attached view of the utility model band octal blast cap;

Fig. 7 is the main cutaway view of the double 12 hole blast caps of the utility model band;

Fig. 8 is the attached view of the double 12 hole blast caps of the utility model band;

Referring to Fig. 1, the utlity model has body of heater 3, coal supply system 15,4, airducts 10 of feed system, pressure fan 11, design has boiling bed 1 in body of heater 3, suspension section 2, U type burning chamber 6, hot exhanst gas outlet 5, preceding fire door 12, and one advances air distribution plate 8 is installed in the air inlet blast cap 7, cold slag tube 9 under bottom of furnace body boiling bed 1.

Air distribution plate 8 is made by the steel plate of 20 millimeters thick, and area is 1 * 1 meter ², (as Fig. 2) has 180 of the apertures of 39 millimeters of  on it, is equilateral triangle and arranges, and so that blast cap 7 (totally 180) to be installed, the hole 16 that the center has 109 millimeters of  is used for attaching cold slag tube 9.

Referring to having six apertures on Fig. 3,4 blast caps 7, according to the needs that become percent opening with blast cap 7 create two kinds of AB (six small-bores on the A type blast cap are 4.8 millimeters,

The purpose of this utility model is achieved like this: offer the secondary air mouth on boiling bed front wall that has the high-temperature flue gas fluidized bed furnace now or side wall, dispose the secondary air system simultaneously, and its percent opening of air distribution plate on the air inlet of bottom of furnace body brought up to 2.4～3.5%, promptly increase the perforated area (gross area of perforate on percent opening two blast caps of air distribution plate: the area of air distribution plate) on the blast cap.

The percent opening of above-mentioned air distribution plate is for becoming percent opening, and promptly the air distribution plate percent opening of air distribution plate upper periphery and cold cinder hole vicinity is greater than all the other air distribution plate percent openings partly, to improve fluidisation (boiling) quality in the stove.

Above-mentioned secondary air system has directly utilized pressure fan No. one time, picks out from the airduct of a wind, leads to the air inlet of secondary wind.

Because the utility model has been set up secondary air and has been increased the percent opening of air distribution plate, make excess air coefficient reach 2～3.5, for enough air are provided in the burner hearth, take away the heat that produces in the stove and enter dryer, regulate furnace temperature, realize heat balance, avoid the overtemperature slagging scorification.And fuel is gone into be diffused into rapidly behind the stove in the siege everywhere, quicken fire burns, strengthening the gas stream in the stove disturbance, improving gas, solid two-phase mixing, and because the change percent opening of air distribution plate, improved fluidization quality, overheavy firing can be closed fire door simultaneously, carry out closed operation, thereby improved the thermal efficiency of stove greatly, and can improve environment, improved degree of safety.

Find out that from above-mentioned improvement of the present utility model very simply is easy to realize.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is a general structure schematic diagram of the present utility model;

Fig. 2 is the attached view of wind air distribution plate of this practicality;

The Type B small aperture is 4.3 millimeters).A type blast cap is done on the aperture of 84 peripheries that are installed on air distribution plate 8 respectively, and on the contiguous aperture of cold cinder hole 16 position of hole, garden (be drawn in Fig. 2 air distribution plate), the Type B blast cap has 96 to be installed on above-mentioned all the other places position of hole, garden (be do not draw among Fig. 2) respectively, so form and become percent opening, improve fluidization quality.

The percent opening of said structure air distribution plate is 2.4%.

Simultaneously on the front wall of the utility model body of heater 3 boiling beds 1, the top of fire door 12 is offered, secondary air mouth 14, the wind regime of secondary wind are pressure fans 11 that directly utilizes, and secondary air channel 13 is to pick out from an airduct 10.

In above-mentioned structure of the present utility model, owing to adopted the large opening rate of air distribution plate and become percent opening and layout secondary air system, thereby for enough air are provided in the stove, effectively high-temperature flue gas is taken away (entering dryer), and regulated furnace temperature, prevent slagging scorification, strengthen the gas stream in the stove disturbance, improve fluidization quality, improve the gas-solid two-phase and mix overheavy firing.

Test shows that the high-temperature flue gas that the utility model produces is sufficient stable, and efficiency of combustion reaches 95.4%, and the thermal efficiency reaches 89.8%, and energy-saving effect is remarkable.

The utility model can also be implemented like this, the secondary air mouth is opened on the left side wall (or right-side wall) of body of heater 3 boiling beds 1, and set up second blower, connect secondary air channel, and be contained in blast cap such as Fig. 5 on the wind fabric swatch of a wind, 6 have eight apertures (with above-mentioned embodiment, eight small-bores of A type blast cap are 5.2 millimeters, eight small-bores of Type B blast cap are 4.8 millimeters) or as Fig. 7,8 have double 12 apertures, and (12 small-bores of its A type blast cap are 4.8 millimeters, 12 small-bores of Type B blast cap are 4.3 millimeters), and the mode of pressing the foregoing description arranges AB type blast cap on air distribution plate, and this moment, the percent opening of air distribution plate was respectively 2.4% and 3.5%.Other structure then can realize the purpose of this utility model equally with above-mentioned embodiment.

Claims

1. be used to dry a kind of high-temperature flue gas fluidized bed furnace of material, has the band boiling bed, suspension section, burning chamber, the body of heater of hot exhanst gas outlet, coal supply system, feed system, an air inlet system and on an air inlet of bottom of furnace body, air distribution plate is housed, blast cap and cold slag tube, it is characterized in that: on the front wall of body of heater boiling bed or side wall, have secondary air mouth and equipped, the secondary air system is arranged; The air distribution plate percent opening of an air inlet of bottom of furnace body is 2.4～3.5%

2. high-temperature flue gas fluidized bed furnace according to claim 1 is characterized in that: the air distribution plate percent opening of its periphery of air distribution plate and cold cinder hole vicinity is greater than all the other air distribution plate percent openings partly.

3. high-temperature flue gas fluidized bed furnace according to claim 1 and 2 is characterized in that: the secondary air system equipped with the secondary air mouth directly picks out from an airduct.