CN109647167A - A kind of comprehensive recycling system and method for PVC salkali waste and gas burning kiln exhaust gas - Google Patents
A kind of comprehensive recycling system and method for PVC salkali waste and gas burning kiln exhaust gas Download PDFInfo
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- CN109647167A CN109647167A CN201910072574.2A CN201910072574A CN109647167A CN 109647167 A CN109647167 A CN 109647167A CN 201910072574 A CN201910072574 A CN 201910072574A CN 109647167 A CN109647167 A CN 109647167A
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- burning kiln
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- 239000002699 waste material Substances 0.000 title claims abstract description 58
- 238000004064 recycling Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Substances [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- 238000005273 aeration Methods 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000010521 absorption reaction Methods 0.000 claims abstract description 33
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims abstract description 17
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims abstract description 17
- 239000012267 brine Substances 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 100
- 238000009826 distribution Methods 0.000 claims description 16
- 239000007791 liquid phase Substances 0.000 claims description 15
- 239000000945 filler Substances 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- 239000003546 flue gas Substances 0.000 claims 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000460 chlorine Substances 0.000 abstract description 2
- 229910052801 chlorine Inorganic materials 0.000 abstract description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000005997 Calcium carbide Substances 0.000 description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
Abstract
The present invention proposes the comprehensive recycling system and method for a kind of PVC salkali waste and gas burning kiln exhaust gas.The comprehensive recycling system includes circulating slot, salkali waste liquid pump, absorption tower, aeration tower, the circulating slot connects the absorption tower with salkali waste liquid pump by pipeline, the aeration tower is connected with gas burning kiln exhaust piping, blower is provided on the gas burning kiln exhaust piping, the aeration tower connects the absorption tower by exhaust pipe.The comprehensive recycling system and method for acetylene salkali waste and gas burning kiln exhaust gas proposed by the present invention, by the CO in the spent lye generated in acetylene production and gas burning kiln tail gas2Carry out reaction production Na2CO3, and by the Na of generation2CO3Reuse cleans as crude brine and uses into the primary brine system of chlorine industry.Achieve the purpose that comprehensive utilization of waste, while reducing influence of the waste generated in system production to environment.
Description
Technical field
The invention belongs to chemical fields, and in particular to a kind of method of comprehensive utilization of acetylene production by-product.
Background technique
In calcium carbide process PVC production technology, acetylene gas processed is mainly reacted with water using calcium carbide, the thick acetylene gas which generates
In containing impurity, the thick acetylene gas such as hydrogen sulfide, hydrogen phosphide also need the soda lye pair by 15% after sodium hypochlorite is peace and quiet
Thick acetylene gas is neutralized, and removes the impurity such as sulfuric acid, the phosphoric acid being wherein mingled with.Spent lye concentration that treated about 9% is made
For waste discharge processing.
Lime gas burning kiln uses the CO that generates in calcium carbide production process as the burning energy, CO full combustion in gas burning kiln
High temperature is generated, lime stone decomposes at a high temperature of gas burning kiln, generates calcium oxide and CO2, CO2With gas burning kiln tail gas through dust separation
After be directly discharged into atmosphere.
The above-mentioned processing method of the prior art, leads to the waste of a large amount of caustic soda.In addition, the tail gas temperature of lime gas burning kiln discharge
Up to 100 DEG C of degree, being discharged into atmosphere and also resulting in waste heat cannot make full use of.It may also suppress side reaction using the high-temperature of the exhaust gas
Generation.
Summary of the invention
The technical problem to be solved by the present invention is to by the CO in the spent lye generated in acetylene production and gas burning kiln tail gas2Into
Row reaction production Na2CO3, comprehensively utilize waste.Based on this, the first purpose of this invention is to propose a kind of PVC salkali waste and gas
The comprehensive recycling system of firing exhaust gas.
Second object of the present invention is the comprehensive recycling method for proposing a kind of PVC salkali waste and gas burning kiln exhaust gas.
Realize above-mentioned purpose technical solution of the present invention are as follows:
The comprehensive recycling system of a kind of PVC salkali waste and gas burning kiln exhaust gas, including circulating slot salkali waste liquid pump, absorption tower, gas washing
Tower,
The circulating slot connects the absorption tower with salkali waste liquid pump by pipeline, and the aeration tower is connected with gas burning kiln exhaust gas
Pipeline, is provided with blower on the gas burning kiln exhaust piping, and the aeration tower connects the absorption tower by exhaust pipe.
Wherein, the aeration tower is provided with liquid phase circulation pipeline.Aeration tower is provided on the liquid phase circulation pipeline to follow
Ring pump；The aeration tower is packed tower, and the import of liquid phase circulation pipeline is connected to the liquid distribution trough above filler (that is, gas washing
Tower bottom liquid is by pump driving circulation, under drenching from aeration tower top through liquid distribution trough).Because exhaust temperature is high, dust is more, this
Aeration tower does not spray form with common spray head, but uses form of bio-carrier.Filler used can be identical with absorption tower.
Wherein, the circulating slot is connected with acetylene spent alkali line；It is connected with exhaust gas guide pipe at the top of the absorption tower, it is described
Exhaust gas guide pipe protrudes into circulating slot.Exhaust gas guide pipe protrudes into about 300-500mm in circulating slot, it is not necessary to extend under liquid level.
Wherein, the absorption tower is packed tower, the filler of filled PVC material in tower, is provided with liquid distribution above filler
Device；The circulating slot is connected to the liquid distribution trough in tower by pipeline.
Wherein, the aeration tower is connected in the absorption tower by exhaust pipe, and exhaust pipe import is connected to positioned at institute
The gas distribution tube below filler is stated, is the region for converging liquid below gas distribution tube, the region of the convergence liquid is logical
It crosses pipeline and connects the circulating slot.
A kind of comprehensive recycling method of PVC salkali waste and gas burning kiln exhaust gas, comprising steps of
1) start salkali waste liquid pump, controlled by valve, by the spent lye and absorption tower formation liquid phase circulation in circulating slot；It opens
Dynamic aeration tower circulating pump would be enclosed in the liquid phase in aeration tower and form circulation.
2) gas burning kiln tail gas is evacuated in system using blower, tail gas first pass through aeration tower by in tower from top to bottom
Water circulation heat exchange, by the temperature of tail gas be reduced to 90 DEG C hereinafter, removing the dust being mingled in tail gas simultaneously.
3) tail gas that aeration tower comes out by cooling enters in absorption tower, is reacted in Ta Nei with salkali waste, produces
Na2CO3。
4) tail gas is discharged through absorption tower top exit, is introduced into circulating slot through guide wire, prevents tail gas air quantity from crossing senior general and follows
Ring tank liquid is blown in atmosphere.
Wherein, the spent lye that acetylene cleaning process generates is sent to reaction scene using tank car or pipeline, tank car transport is useless
Salkali waste is unloaded in slot from flowing to when alkali using unloading recessing, alkali in groove liquid of unloading is beaten by pump into circulating slot spare；Use pipe
It is spare into circulating slot that salkali waste is then directly turned when conveying in road.
Wherein, the blower be provided with emptying outlet, using emptying outlet on valving system pressure be 30~
50kPa。
The salkali waste liquid pump can multifunctional use because this system be interval start, can be used the pump as discharge pump dress
Vehicle can also unload, and circulating pump when reaction then as driving waste liquid uses.
It is in absorption operation, pump discharge is constant, it is found by experiment that, air quantity is bigger, and assimilation effect is better.Herein propose one
Kind preferred proportion: in step 3), the flow of pump and the volume ratio of fan delivery are 1:(110~130).
For example, pump discharge 25m3/ h, then fan delivery control is 2750~3250m3/h。
Preferably, in step 3), with the lasting extension in reaction time, the NaOH concentration in salkali waste holds reduction, generation
Na2CO3Concentration gradually rises；When NaOH concentration is down to 1% or less in salkali waste, it is considered as fully reacting.It then will be in circulating slot
Na2CO3Solution is delivered to primary brine removal of impurities and uses.
Further, tail gas is discharged through absorption tower top exit, is introduced into circulating slot through guide wire.
The beneficial effects of the present invention are:
The comprehensive recycling technology of acetylene salkali waste and gas burning kiln exhaust gas in PVC production proposed by the present invention, including comprehensive recycling
System and method, the CO in spent lye that this comprehensive recycling technology generates acetylene production and gas burning kiln tail gas2It is reacted
Produce Na2CO3, and by the Na of generation2CO3Reuse cleans as crude brine and uses into the primary brine system of chlorine industry.
Achieve the purpose that comprehensive utilization of waste, while reducing influence of the waste generated in system production to environment.
Detailed description of the invention
Fig. 1 is the structure diagram of the comprehensive recycling system of PVC salkali waste and gas burning kiln exhaust gas of the invention.
In figure, component is corresponding with number are as follows:
Circulating slot 1, salkali waste liquid pump 2 unload recessing 3, absorption tower 4, gas distribution tube 5, aeration tower circulating pump 6, aeration tower 7,
The outlet 8 of emptying, exhaust gas guide pipe 9, blower 10.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.This field skill
Art personnel, without departing from the spirit of the present invention can be with it is to be understood that the scope of the present invention is not limited only to specific embodiment
Carry out various modifications and alterations.
If not otherwise specified, means employed in specific embodiment are this field conventional technology.
Embodiment 1,
Referring to Fig. 1, the comprehensive recycling system of a kind of PVC salkali waste and gas burning kiln exhaust gas, including circulating slot 1, salkali waste liquid pump 2,
Absorption tower 4, aeration tower 7,
The circulating slot 1 connects the absorption tower 4 by pipeline and salkali waste liquid pump 2, and the aeration tower is connected with gas burning kiln
Exhaust piping is provided with blower 10 on the gas burning kiln exhaust piping, the outlet 8 of emptying is provided on blower, in the blower
Outlet utilizes hand valve emissions adjustment system pressure.
The aeration tower 7 connects the absorption tower 4 by exhaust pipe.
Further, the aeration tower is provided with liquid phase circulation pipeline, is provided with gas washing on the liquid phase circulation pipeline
Tower circulating pump 6.The aeration tower is packed tower, and the import of liquid phase circulation pipeline is connected to the liquid distribution trough above filler.It fills out
Material uses the φ 75mm plum-blossom ring of PVC material.
The circulating slot is connected with acetylene spent alkali line；Exhaust gas guide pipe 9, the exhaust gas guide are connected at the top of absorption tower
Pipe 9 protrudes into circulating slot 1, and exhaust gas guide pipe protrudes into about 300mm in circulating slot.
The absorption tower 4 is packed tower, the φ 75mm plum blossom ring filler of filled PVC material in tower, is provided with above filler
Liquid distribution trough；Circulating slot 1 is connected to the liquid distribution trough in tower by pipeline,
The aeration tower 7 is connected in the absorption tower 4 by exhaust pipe, and exhaust pipe import is connected to positioned at filler
The gas distribution tube 5 of lower section, being distributed in gas is the region for converging liquid below 5 pipes, and the region of the convergence liquid passes through pipe
Line connects the circulating slot.
One comprehensive recycling system can only use a circulating slot, and the system of the present embodiment uses two slots (1# in figure
And 2#) mutual backup, storage capacity is more.In the present embodiment, recessing 3 is unloaded in circulating slot connection, will unload recessing 3 by salkali waste liquid pump
Interior lye is beaten into circulating slot spare.
Embodiment 2
The comprehensive recycling method of a kind of PVC salkali waste and gas burning kiln exhaust gas, the spent lye that wherein acetylene cleaning process generates make
It is sent with tank car or pipeline to reaction scene, salkali waste is unloaded in slot from flowing to using unloading recessing when tank car transport salkali waste, unload recessing
Interior lye is beaten by pump into circulating slot spare；Using then directly turning when pipeline, salkali waste is spare into circulating slot.
The comprehensive recycling method of the present embodiment, using the system of embodiment 1, by the synthesis of acetylene salkali waste and gas burning kiln exhaust gas
Reuse.Comprising steps of
1) start salkali waste liquid pump 2, controlled by valve, by the spent lye and absorption tower formation liquid phase circulation in circulating slot；
Start aeration tower circulating pump 6, the liquid phase that would be enclosed in aeration tower forms circulation.
2) gas burning kiln tail gas (about 100 DEG C) is evacuated in system using blower, and is adjusted in fan outlet using the discharge of hand valve
Save system pressure, control pressure be 30-50kPa, tail gas first pass through aeration tower by with the water circulation heat exchange in tower from top to bottom,
By the temperature of tail gas be reduced to 90 DEG C hereinafter, removing the dust being mingled in tail gas simultaneously.
3) tail gas that aeration tower comes out by cooling enters in absorption tower, is reacted in Ta Nei with salkali waste, produces
Na2CO3.Control pump discharge 25m3/ h, fan delivery 3000m3/h。
4) tail gas is discharged through absorption tower top exit, is introduced into circulating slot through guide wire, prevents tail gas air quantity from crossing senior general and follows
Ring tank liquid is blown in atmosphere.
In step 3), with the lasting extension in reaction time, the NaOH concentration in salkali waste holds reduction, the Na of generation2CO3It is dense
Degree gradually rises；The concentration of wherein alkali is measured using Dual alkali.When NaOH concentration is down to 1% or less in salkali waste, it is considered as reaction
Completely, it is pumped using 2# by the Na in circulating slot 1 by valve control2CO3Solution entrucking is transported to primary brine removal of impurities and uses.
Using method of the invention, for producing 300000 tons of PVC process units per year, year can hundred Na of output folding2CO3About 2000 tons/
Year；Increase about 4,000,000 yuan of the output value.
Above embodiment be only preferred embodiments of the present invention will be described, not to the scope of the present invention into
Row limits, and without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technical side of the invention
The all variations and modifications that case is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (10)
1. the comprehensive recycling system of a kind of PVC salkali waste and gas burning kiln exhaust gas, which is characterized in that including circulating slot, salkali waste liquid pump, inhale
Tower, aeration tower are received,
The circulating slot connects the absorption tower with salkali waste liquid pump by pipeline, and the aeration tower is connected with gas burning kiln flue gas leading
Road, is provided with blower on the gas burning kiln exhaust piping, and the aeration tower connects the absorption tower by exhaust pipe.
2. the comprehensive recycling system of PVC salkali waste according to claim 1 and gas burning kiln exhaust gas, which is characterized in that described to wash
Gas tower is provided with liquid phase circulation pipeline, is provided with aeration tower circulating pump on the liquid phase circulation pipeline；The aeration tower is to fill out
Expect tower, the import of liquid phase circulation pipeline is connected to the liquid distribution trough above filler.
3. the comprehensive recycling system of PVC salkali waste according to claim 1 and gas burning kiln exhaust gas, which is characterized in that described to follow
Annular groove is connected with acetylene spent alkali line；It is connected with exhaust gas guide pipe at the top of absorption tower, the exhaust gas guide pipe protrudes into circulating slot.
4. the comprehensive recycling system of described in any item PVC salkali waste and gas burning kiln exhaust gas, feature exist according to claim 1~3
In the absorption tower is packed tower, the filler of filled PVC material in tower, is provided with liquid distribution trough above filler；The circulation
Slot is connected to the liquid distribution trough in tower by pipeline.
5. the comprehensive recycling system of PVC salkali waste according to claim 4 and gas burning kiln exhaust gas, which is characterized in that described to wash
Gas tower is connected in the absorption tower by exhaust pipe, and exhaust pipe import connection is located at the gas distribution below the filler
Pipe is the region for converging liquid below the gas distribution tube, and the region of the convergence liquid described in pipeline connection by following
Annular groove.
6. the comprehensive recycling method of a kind of PVC salkali waste and gas burning kiln exhaust gas, which is characterized in that comprising steps of
1) start salkali waste liquid pump, by the spent lye and absorption tower formation liquid phase circulation in circulating slot；Starting aeration tower circulating pump will
The liquid phase being enclosed in aeration tower forms circulation；
2) gas burning kiln tail gas is evacuated in system using blower, tail gas first passes through aeration tower by following with the water in tower from top to bottom
Ring heat exchange, by the temperature of tail gas be reduced to 90 DEG C hereinafter, removing the dust being mingled in tail gas simultaneously；
3) tail gas that aeration tower comes out by cooling enters in absorption tower, is reacted in Ta Nei with salkali waste, and Na is produced2CO3；
4) tail gas is discharged through absorption tower top exit, is introduced into circulating slot through guide wire.
7. comprehensive recycling method according to claim 6, which is characterized in that use tank car or pipeline by acetylene cleaning process
The spent lye of generation is sent to reaction scene, salkali waste is unloaded in slot from flowing to using unloading recessing when tank car transport salkali waste, is unloaded recessing
Interior lye is beaten by pump into circulating slot spare；Using then directly turning when pipeline, salkali waste is spare into circulating slot.
8. comprehensive recycling method according to claim 6 or 7, which is characterized in that the blower is provided with emptying outlet, benefit
It is 30~50kPa with the valving system pressure in emptying outlet.
9. comprehensive recycling method according to claim 6 or 7, which is characterized in that in step 3), the flow and blower wind of pump
The volume ratio of amount is 1:(110~120).
10. comprehensive recycling method according to claim 6 or 7, which is characterized in that in step 3), with the reaction time
Lasting to extend, the NaOH concentration in salkali waste holds reduction, the Na of generation2CO3Concentration gradually rises；When NaOH concentration is down in salkali waste
When 1% or less, it is considered as fully reacting, then by the Na in circulating slot2CO3Solution is delivered to primary brine removal of impurities and uses.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337269A (en) * | 2020-09-07 | 2021-02-09 | 甘肃北方三泰化工有限公司 | Waste gas recycling system and application method in crude salt refining |
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