CN102515208A

CN102515208A - Method and apparatus for producing sodium sulfite through 100% recovery of boiler exhaust gas by sodium carbonate

Info

Publication number: CN102515208A
Application number: CN2011103239186A
Authority: CN
Inventors: 廖树汉
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-30
Filing date: 2006-10-30
Publication date: 2012-06-27

Abstract

The invention provides an apparatus which is the first apparatus for producing water-soluble sodium sulfite capable of replacing insoluble calcium sulfite by using sodium carbonate capable of replacing limestone or lime. The method of the invention can reduce the abrasion and corrosion of the apparatus, and obtain the sodium sulfite with price higher than that of calcium sulfite, thereby the profitability can be acquired. The method comprises the following steps: sodium carbonate is introduced from a composite overflow foam tower top and then is discharged from the bottom of the tower; SO2 is introduced from the tower bottom, the rising exhaust gas blows the sodium carbonate liquid of each layer of porous sheet to liquid foams, SO2 is reacted with sodium carbonate to generate sodium sulfite when SO2 bumps with the liquid foams; SO2 for rising exhaust gas is gradually reduced, when the exhaust gas rises to a front two layers which are the liquid foam layer on the tower top, SO2 and sodium carbonate are subjected to a complete reaction, no SO2 on the tower top is discharged; the descending sodium carbonate is gradually reduced, the sodium carbonate is completely absorbed by SO2 before being discharged from a front two layers which are the foam layer at the tower bottom, the front two layers which are the liquid foam layer are full of SO2, and the sodium sulfite discharged from the tower bottom contains no sodium carbonate.

Description

Produce the method and the device thereof of S-WAT with yellow soda ash 100% recovery boiler waste gas

At present, China has and surpasses 1.6 hundred million tons of sulfurous gas and enter atmosphere, and 20 cities that topsoil is the most serious have 16 in China in the world, and the acid rain influence area accounts for 1/3 of area.2008, Guangzhou Environmental Protection Agency says, 10 rainfalls in Guangzhou, and having 8 times is acid rain.This shows that the flue dust sulphur removal is a difficult problem.Because flue dust contains sulfurous gas quantity pettiness, claim that at present advanced Wingdale desulfurization process falls behind, equipment is expensive; The calcium sulfite price is low again, and main is solid-state Wingdale, calcium sulfite easy blocking, wearing and tearing desulfurizing device; Make manufacturer lose more than gain, economical impaired, thereby promote difficulty.

Acid rain except that sulfurous acid, also has nitrous acid.In the past, country does not report the harm of nitrous acid the monitoring of acid rain, includes nitrous acid harm in monitoring removing scope now.

At present, do not see the report of producing S-WAT with yellow soda ash recovery boiler waste gas.Method and device thereof with yellow soda ash 100% recovery boiler waste gas production S-WAT that present technique proposes are called for short present method and device thereof, can help to address the above problem.

With the method and the device thereof of yellow soda ash 100% recovery boiler waste gas production S-WAT, its beneficial effect is: make the boiler sulphur removal make up deficits and increase surpluses.

With the method and the device thereof of yellow soda ash 100% recovery boiler waste gas production S-WAT, the technical scheme that its technical solution problem is adopted is, but with after the boiler waste gas dedusting, absorbs boiler waste gas with yellow soda ash liquid and obtain S-WAT; After it can send into compound overflow foam column (3) dedusting that dedusting agent is housed with boiler waste gas (1) with blower fan (2); Dust-removing waste gas is sent into again acquisition S-WAT in the compound overflow foam column (5) that yellow soda ash liquid is housed with blower fan (4), thereby the method for using yellow soda ash 100% recovery boiler waste gas to produce S-WAT is able to normal operation.Like Fig. 1

The existing operation of introducing with boiler waste gas production S-WAT method.

Boiler waste gas contains the sulfurous gas of trace, eliminates its relatively difficulty fully.

What present technique proposed produces the S-WAT method with yellow soda ash recovery boiler waste gas, and ability 100% is eliminated sulfurous gas, obtains liquid product.

Blower fan is sent into dust-removing waste gas in the compound overflow foam column that yellow soda ash liquid is housed again, and sulfur dioxide gas passes the porous plate of compound overflow foam column, and when yellow soda ash liquid was blown out foam layer, the yellow soda ash of bump bubble film reacted the generation S-WAT.Every cubic metre has 1,000,000 to 8,000,000 foams that sulfur dioxide gas is wrapped up in the compound overflow foam column, and makes the sulfur dioxide gas bump that in vacuole, rolls, and makes the sulfurous gas can be fully and yellow soda ash reaction generation S-WAT.S-WAT is water-soluble, handles more easily than water-fast calcium sulfite, eliminate calcium sulfite the friction that equipment produces is damaged, and the S-WAT price is higher than calcium sulfite, makes the boiler sulphur removal make up deficits and increase surpluses.

Below be described further through embodiment.

Compound overflow foam column is to carry out the device of producing the method for S-WAT with yellow soda ash 100% recovery boiler waste gas.

Compound overflow foam column, its beneficial effect is: can be with the sulfurous gas full scale clearance, can 100% reclaim sulfurous gas, less than 2% sulfurous gas, also can produce S-WAT with concentration content.

Compound overflow foam column, the technical scheme that its technical solution problem is adopted are by transparent tube (6), to be uniformly distributed with the porous plate (7) of aperture, upflow tube (8), turnover gas-liquid pipe (9) composition; Its installation is, sealing transparent tube one end is with the polylith porous plate segment distance of being separated by; Be installed in the transparent tube; Upflow tube passes porous plate, and upflow tube upper end is near last block porous plate, and the upflow tube lower end is near piece porous plate down; The sealing transparent tube the other end is installed into out gas-liquid pipe at sealing transparent tube upper and lower ends; Make compound overflow foam column (10) be able to normal operation.Like Fig. 1

Compound overflow foam column operation is introduced:

Sulfur dioxide gas gets at the bottom of tower, discharges from cat head; Yellow soda ash liquid gets into from cat head, at the bottom of tower, discharges.Yellow soda ash liquid is passed the sulfur dioxide gas of porous plate and is blown out vacuole; When yellow soda ash vacuole floor height was crossed upflow tube, the yellow soda ash vacuole became yellow soda ash liquid and stays on this porous plate from the porous plate of overflow mouth of pipe inflow lower floor; Passed the sulfurous gas of this porous plate again and blown out yellow soda ash vacuole layer; The yellow soda ash vacuole flows into the porous plate of a lower floor again from the overflow mouth of pipe, from again repeatedly, until being gone out by tower bottom flow.Control yellow soda ash flow quantity makes a small amount of vacuole flow into the porous plate of one deck down from the overflow mouth of pipe; The pilot-gas flow; Make the two-layer vacuole layer of cat head keep the former entering concentration of yellow soda ash liquid, make on the waste gas to the cat head three first layers, sulfurous gas with yellow soda ash liquid complete reaction; Sulfurous gas is all reclaimed; Cat head does not just have sulfurous gas to discharge, make at the bottom of the tower equally before the sulfurous gas of two-layer vacuole layer keep former entering concentration, will discharge the not liquid of carbonated sodium at the bottom of the tower.Sulfurous gas and the reaction of yellow soda ash liquid generate S-WAT, make its concentration of the every rising layer of sulfurous gas just reduce, and sulfurous gas rises through multilayer, and concentration constantly reduces, and is raised to the cat head three first layers, and sulfurous gas does not have.

Every cubic metre can produce 8,000,000 foams sulfur dioxide gas is wrapped up in the compound overflow foam column, and makes sulfur dioxide gas in vacuole, roll.In the compound overflow foam column up to a hundred blocks of porous plates can be arranged, hold tens cubic metres of yellow soda ash vacuole foams; Upflow tube makes every layer of foamy most foams go the rounds tens times at this layer foam layer, makes tens bumps of yellow soda ash liquid sulfurous gas of every layer; In compound overflow foam column, sulfurous gas bump yellow soda ash liquid several thousand times carries out slap-up reaction, and the sulfurous gas ability 100% that guarantees to get in the compound overflow foam column is recovered.

The Figure of description explanation:

1. boiler waste gas, 2. blower fan, 3. compound overflow foam column, 4. blower fan, 5. formula overflow foam column, 6. transparent tube 7. is uniformly distributed with the porous plate of aperture, 8. upflow tube, 9. upflow tube, 10. compound overflow foam column.

Claims

1. produce the method and the device thereof of S-WAT with yellow soda ash 100% recovery boiler waste gas, it is characterized in that, but, absorb boiler waste gas with yellow soda ash liquid and obtain S-WAT after the boiler waste gas dedusting; After it can send into the compound overflow foam column dedusting that dedusting agent is housed with boiler waste gas with blower fan; With blower fan dust-removing waste gas is sent in the compound overflow foam column that yellow soda ash liquid is housed again and to be obtained S-WAT, thereby the method for using yellow soda ash 100% recovery boiler waste gas to produce S-WAT is able to normal operation.

2. compound overflow foam column according to claim 1 is characterized in that, by transparent tube, is uniformly distributed with the porous plate of aperture, upflow tube, and the turnover gas-liquid pipe is formed; Its installation is, sealing transparent tube one end is with the polylith porous plate segment distance of being separated by; Be installed in the transparent tube; Upflow tube passes porous plate, and upflow tube upper end is near last block porous plate, and the upflow tube lower end is near piece porous plate down; The sealing transparent tube the other end is installed into out gas-liquid pipe at sealing transparent tube upper and lower ends; Make compound overflow foam column be able to normal operation.