CN1039459A

CN1039459A - Multifunction alkaline recovering smoke and waste steam boiler

Info

Publication number: CN1039459A
Application number: CN 89104007
Authority: CN
Inventors: 张世乐
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-06-12
Filing date: 1989-06-12
Publication date: 1990-02-07
Anticipated expiration: 2004-06-12
Also published as: CN1027708C

Abstract

The invention relates to the reclaimer of pulp mill's pulping waste liquor burning back waste-gas heat and alkali dirt, and it is mainly combined by waste heat boiler, alkali dirt automatic separation and collection system and bearing.Be mainly used in following small-sized factory of 20 tons of slurry/days, also can be used for the medium-sized factory about 30 tons of slurry/days.It can make fume afterheat convert steam, hot water and hot blast to and use for producing, and the utilization rate of fume afterheat is up to about 80%.It can also make a large amount of alkali dirt in the flue gas separate automatically, capture and melt down, and it cooperates with venturi, and total dust removal efficiency is about 90%, and alkali recovery improves 5～10%.

Description

Multifunction alkaline recovering smoke and waste steam boiler

The invention relates to the reclaimer of pulp mill's pulping waste liquor burning back waste-gas heat and alkali dirt.

At present, domestic and international large and medium-sized pulp mill mostly adopts the method for burning black liquor to reclaim alkaline matter (NaOH and Na in the black liquor ₂S), be reused for slurrying, simultaneously, a large amount of waste heats that utilize the organic substance in the burning black liquor to emit produce steam, use for producing, and turn waste into wealth.But the alkali recovery equipment investment of large and medium-sized factory is huge, is not suitable for little factory and uses.At present, both at home and abroad the black liquor of pulp making of the small-sized factory of great majority below 20 tons of slurry/days all directly enters rivers, causes environmental pollution, and domestic now have only a few factory

Adopt the supporting alkali that carries out of simple and easy injection stove and alkali dirt expansion chamber to reclaim, through facts have proved for many years, it is simple in structure, investment is less, easily for the workman grasps, certain economic benefit and social benefit are arranged, but shortcoming is quite a few;

1. alkali recovery is low, only reaches 50～55%.

2. the expansion chamber operating condition is abominable, and labor strength is big.The flue gas that comes out from simple and easy injection stove reaches 900 ℃, contain a large amount of alkali dirt and fused mass in the flue gas, produce second-time burning after entering expansion chamber, first Room of expansion chamber is often burnt aglowly, cleaning alkali dirt in the workman can't go into, alkali dirt is cumulative, can become very hard, be difficult to remove, will could remove with air drill sometimes.

3. it is long to remove the alkali dirt time, one less important more than ten days, causes alkali to reclaim imbalance between each workshop section, if furnace outage time is longer, the black liquor amount is too many, can't store, and have to enter rivers, if can not enter rivers, slurrying and copy paper and have to stop production causes than large economy and loses.

4. the utilization rate of fume afterheat is extremely low, has only about 10%, and most waste heats are wasted, and the alkali cost recovery is increased.

5. the flue gas that enters Venturi tube behind expansion chamber is considerably beyond 250 ℃, make Venturi tube can not directly evaporate black liquor, can only spray water dedusting and reduce flue-gas temperature, can't reuse from the alkali dirt waste water that contains that Venturi tube and cyclone separator come out, enter rivers, cause the pollution of environment and the waste heat of waste flue gas.

6. because spray cooling dedusting in the Venturi tube makes the flue gas that enters air-introduced machine and chimney contain a large amount of water vapours, in air-introduced machine and inner wall of stack condensation, these condensed waters contain certain pH value, easily cause the corrosion failure of air-introduced machine and chimney.

7. the economizer bank in the expansion chamber easily amasss alkali dirt, and heat exchange effect is poor, and red-hot alkali dirt also can corrode tube wall.

The purpose of the invention provides to a kind of multi-functional alkali of small-sized pulp mill and reclaims smoke and waste steam boiler, the waste heat that it can utilize the burning black liquor to produce removes to produce hot water, steam and hot blast can make alkali dirt separate automatically simultaneously and automatic the capture, can also automatic transport return simple and easy injection stove.

The main structure of the invention is: be made up of waste heat boiler, alkali dirt automatic separation and collection system and bearing (11) from top to bottom, and communicate with the top of the simple and easy injection stove (14) of front.Waste heat boiler in the alkaline recovering smoke and waste steam boiler partly comprises: the water-cooled smoke exhaust pipe (1) that is communicated with simple and easy injection stove (14) top, as the water-cooled cyclonic separation cover (2) of boiler wall, admittedly be suspended in these separation sleeve central authorities flue (3), be positioned at lifting pipe (4), steamdrum (5) and down-flow pipe (6) that the water-cooled cyclonic separation is overlapped outer upside.

Alkali dirt separates automatically and trapping system comprises transmission mechanism (9) and the alkali dirt discharge bucket (10) that water-cooled cyclonic separation cover (2), flue (3), air preheat chuck (7), the alkali dirt capturing device (8) on seating plane and this device are beneath.

For the ease of alkali dirt being carried back simpler and easy injection stove go burning, be preferably in automatic separation of alkali dirt and trapping system and be provided with the alkali dirt automatic conveying system that comprises to dirt device (12) and alkali dirt conveyer (13) afterwards.

Accompanying drawing 1 is that alkali dirt expansion chamber of the prior art and the matching used structure of simple and easy injection stove are illustrated two views.

In accompanying drawing 1: 1. smoke exhaust pipe; 2. expansion chamber; 3. economizer bank; 4. partition wall; 5. simple and easy injection stove;

Accompanying drawing 2 is that the invention and the matching used structure of simple and easy injection stove are illustrated two views.

In accompanying drawing 2, the flue gas of discharging from simple and easy injection stove (14) top at first enters the center of the water-cooled smoke exhaust pipe (1) of this waste heat boiler, this pipe has external jacket, cold water is become the hot water discharge to use for pulp washing by high temperature (about 900 ℃) flue gas heating after feeding chuck, flue gas enters the inwall of water-cooled cyclonic separation cover (2) and air preheat chuck (7) and rotates decline along its inwall with tangential direction after flowing through the water-cooled smoke exhaust pipe, the heavier alkali dirt that is mixed in the flue gas falls furnace bottom, and lighter alkali dirt upwards escapes and enter Venturi tube enter the tubulation of flue from the bottom of flue (3) with flue gas after, be full of water (flue is actually a heat exchanger) around the flue tubulation, also be full of water in the water-cooled cyclonic separation cover, be communicated with steamdrum, constitute natural convection loop.When water when the lower end flows into, absorbed the part heat of flue gas, make partly water vapor and become water, vapour mixture and flow to steamdrum (5) by lifting pipe (4), steam is emitted for producing use from steamdrum.Simultaneously, replenishing soft water to steamdrum again enters respectively by down-flow pipe (6) in flue and the water-cooled cyclonic separation cover.

Reduced to about 250 ℃ from the flue-gas temperature that discharge on the flue top, entered venturi again and directly evaporate the black liquor use.

Become hot blast after entering the heat that cold air in the air preheat chuck absorbs the flue gas in the stove, send back in the simple and easy injection stove combustion-supporting.

Alkali dirt heavier in the flue gas is along in the alkali dirt capturing device (8) that drops under the rotation of air preheat chuck inwall on the seating plane, and this device is the rotating blade formula, drives through transmission mechanism, alkali dirt is scraped into alkali dirt discharged struggle against (10).

This multifunction alkaline recovering smoke and waste steam boiler is lowermost to be bearing (11).

If below alkali dirt is discharged bucket, establish to dirt device (12), enter alkali dirt conveyer (13) again behind the alkali dirt of the bucket of acceptance discharge earlier, just can send alkali dirt automatically back in the simple and easy injection stove and burn.

The invention is mainly used in following small-sized factory of 20 tons of slurry/days, also can be used for 30 tons of medium-sized factories about slurry/day.

The advantage of the invention is:

One, can make fume afterheat convert steam, hot blast, hot water to for production and application, the utilization rate of fume afterheat is up to about 80%. And the fume afterheat utilization rate of alkali dirt expansion chamber is less than 10%.

Two, can make a large amount of alkali dirt in the flue gas automatically separate, capture, melt down, the cleaning of blowing out midway alkali dirt has guaranteed that simple and easy injection stove moves continuously, and has realized the automation mechanized operation of alkali dirt cleaning.

Three, flue gas is behind the invention and venturi two-stage dust removal, and total dust removal efficiency can reach about 90%, and flue gas is behind alkali dirt expansion chamber and venturi two-stage dust removal, total dust removal efficiency only about 70～80%.Simultaneously, the invention cooperate with venturi all recyclable utilization of alkali dirt under removing, so alkali recovery is than cooperating venturi to improve 5～10% with alkali dirt expansion chamber.

Four, fume afterheat is fully used and has improved alkali recovery, so social benefit of the invention and remarkable in economical benefits.

(by designing the estimation tabulation) is relatively with the invention and the benefit of using alkali dirt expansion chamber below for example.

Claims

1, a kind of multifunction alkaline recovering smoke and waste steam boiler that can utilize the waste heat that sends when burning black liquid, be communicated with the top of simple and easy injection stove (14), it is characterized in that combining by waste heat boiler, alkali dirt automatic separation and collection system and bearing (11) from top to bottom.

2, alkaline recovering smoke and waste steam boiler according to claim 1, it is characterized in that wherein waste heat boiler comprise the water-cooled smoke exhaust pipe (1) that is communicated with simple and easy injection stove top, as the water-cooled cyclonic separation cover (2) of boiler wall, admittedly be suspended in these separation sleeve central authorities flue (3), be positioned at lifting pipe (4), steamdrum (5) and the down-flow pipe (6) of the outer upside of water-cooled cyclonic separation cover.

3, alkaline recovering smoke and waste steam boiler according to claim 1 and 2 is characterized in that the automatic separation and collection of alkali dirt system comprises water-cooled cyclonic separation cover (2), flue (3), air preheat chuck (7), is positioned at alkali dirt capturing device (8) and transmission mechanism (9) below this device and alkali dirt discharge bucket (10) on the seating plane.

4, alkaline recovering smoke and waste steam boiler according to claim 3 is characterized in that also being provided with the alkali dirt induction system that comprises to dirt device (12) and alkali dirt conveyer (13) below the automatic separation and collection of the alkali dirt system.