CN86201093U

CN86201093U - Equipment for boiling heavy alcaly-calcining directly using hot air

Info

Publication number: CN86201093U
Application number: CN 86201093
Authority: CN
Inventors: 曾有莘
Original assignee: JIANGXI AMMONIA FACTORY
Current assignee: JIANGXI AMMONIA FACTORY
Priority date: 1986-02-25
Filing date: 1986-02-25
Publication date: 1987-03-11

Abstract

The utility model discloses an apparatus for boiling heavy alkali calcining directly using hot air, mainly comprising a combustion furnace and a boiling calcination furnace. The boiling calcination furnace is arranged above the end part of the combustion furnace, with high temperature heat air current 500-700DEG. C through a specially designed distribution plate, the utility model can directly transfer heat in order to boiling calcinate the heavy alkali. The temperature of a boiling bed can be stably controlled in 160-180DEG. C, and the top and bottom temperature difference of the distribution plate is 400-500DEG. C. The utility model has the advantages of easy fabrication, less investment and easy maintenance, which is suitable for small sized soda producing. The cauterant lost amount of the produced soda is near 0.2-0.3%, which is superior to national standard, the specific gravity can reach 0.7-0.8, which is between the heavy ash and the light ash.

Description

Equipment for boiling heavy alcaly-calcining directly using hot air

This device is applicable to the heavy alkali production of little alkali factory's calcining soda ash.

The converter of the many both at home and abroad at present employing internal heat type steam of weight alkali calcining, it need join medium pressure boiler, the bulky complex of equipment own, processing difficulties.The in addition external-heat converter (stove) of useful oil firing,, equipment heaviness poor because of thermal utilization, maintenance workload is big, labor condition is abominable, newly founds the factory and seldom adopts.China also has the steam fluidized-bed kiln of carrying vapour tube still heater in some little alkali station-services, has indivedual factories then to use the calcining of dried by hot air stream at high temperature pipe.

The purpose of this utility model is the weight alkali calcining device that the calcination loss of seeking a kind of simple and feasible, heat utilization efficiency height, product can meet national standard again.

This device mainly is made up of roasting kiln (3) and fluidized-bed kiln (5).Fluidized-bed kiln (5) is that to make body of heater with general steel plate welding be cylinder-conical ghost.The boiling dielectric distribution plate (4) of stove is a porous plate, and percentage of open area 1.95% is made with heat-resistance stainless steel, in the stove except that heavy alkali distributor no any member, simple in structure, handling ease, maintenance workload is little.

Roasting kiln (3) uses gaseous fuel, and the special safety valve (2) of band labyrinth type sand seal is equipped with on stove top.

Fluidized-bed kiln (5) is directly installed on roasting kiln (3) stove tail top, so that reduce thermosteresis and thermal distortion; Boiling height of bed 2.1-2.4 rice can guarantee to produce stable.

This device flow process is: pressure is that eddy current that the combustible gas of 1100-1400 millimeter water column is gone into roasting kiln (3) through air water separator burns and to chew the air mixed that (1) and Root's blower are sent here, in above-mentioned direct draught burning, be made into 500-700 ℃ high-temperature hot-air, go into porous plate (4), the heavy alkali of direct heat transfer on plate, form ebullated bed and divide the heavy alkali that is situated between to become soda ash, bubbling bed temperature can be stablized and is controlled at 160-180 ℃, upper and lower temperature difference 400-500 ℃ of grid distributor (4).Heavy alkali is with advancing the alkali helical feed and send into ebullated bed through distributor, and finished product soda ash directly send the alkali storehouse to pack through going out the alkali worm conveyor.Internal cyclone separators and diffusion type separator stove outside of calciner gas in stove separates the laggard furnace gas condensing tower of alkali dirt, sends into induced draft fan at last and enters atmosphere after washing tower cleans.

This device heat utilization efficiency is than the high 10-20% of stove, and the loss on ignition of finished product soda ash is 0.2-0.3% only, is better than national standard (GB210-80 regulation soda ash first grade loss on ignition≤0.5%), and proportion 0.7-0.8 is situated between between heavy ash and the light ash.

Accompanying drawing is the sketch of roasting kiln and fluidized-bed kiln, shown in parts be that eddy current burns and to chew (1), safety is cut down (2), roasting kiln (3), grid distributor (4) and fluidized-bed kiln (5).

Claims

1, a kind of weight alkali calcining device of mainly being made up of roasting kiln (3), fluidized-bed kiln (5) is characterized in that directly fluidized-bed kiln (5) being placed roasting kiln (3) stove tail top, no internal heating member in the fluidized-bed kiln (5), boiling height of bed 2.1-2.4 rice.

2,, it is characterized in that the percentage of open area of the inner grid distributor of stove (4) in the calcining furnace (5) is 1.95% by roasting assembly described in the claim 1.