CN113617188A - Sintering waste gas treatment method for optical fiber preform - Google Patents
Sintering waste gas treatment method for optical fiber preform Download PDFInfo
- Publication number
- CN113617188A CN113617188A CN202010380606.8A CN202010380606A CN113617188A CN 113617188 A CN113617188 A CN 113617188A CN 202010380606 A CN202010380606 A CN 202010380606A CN 113617188 A CN113617188 A CN 113617188A
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- China
- Prior art keywords
- gas
- filler
- venturi
- tower
- waste gas
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002912 waste gas Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005245 sintering Methods 0.000 title claims abstract description 18
- 239000013307 optical fiber Substances 0.000 title claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 36
- 239000003513 alkali Substances 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 11
- 231100000719 pollutant Toxicity 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000000746 purification Methods 0.000 claims abstract description 5
- 238000005201 scrubbing Methods 0.000 claims abstract description 4
- 239000002351 wastewater Substances 0.000 claims description 5
- 239000013505 freshwater Substances 0.000 claims description 4
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 231100001261 hazardous Toxicity 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 abstract description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 14
- 229910052801 chlorine Inorganic materials 0.000 description 14
- 239000000460 chlorine Substances 0.000 description 14
- 239000000356 contaminant Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 206010010904 Convulsion Diseases 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000036461 convulsion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- 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
- B01D53/14—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 by absorption
- B01D53/1406—Multiple stage absorption
-
- 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
- B01D53/14—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 by absorption
- B01D53/1412—Controlling the absorption process
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The application relates to a method for treating sintering waste gas of an optical fiber preform, which comprises the following steps: step 10, gas enters a Venturi scrubbing tower, and gas pollutants and sprayed liquid are contacted in a Venturi throat pipe to generate mass transfer; step 20, absorbing the gas pollutants into spraying liquid; step 30, the gas after primary purification enters a filler washing tower to be absorbed and neutralized by circulating alkali liquor again, and sintering waste gas reaches the allowable emission standard; and step 40, adding high-efficiency filler into the filler washing tower, wherein the adding amount of the 30% alkali solution is controlled by ORP. The invention has high absorption efficiency, adopts two-stage absorption of the Venturi filler integrated tower, and ensures that the exhaust emission is lower than the strictest national emission standard; the negative pressure air-conditioning system is beneficial to safety and health, and can form stable negative pressure in an upstream air pipe (under the condition of fan failure) due to the venturi siphon effect, so that a small amount of air draft is kept, and hazardous gas in the air pipe cannot escape to the surrounding space (in a workshop).
Description
Technical Field
The application belongs to the field of optical fiber production and manufacturing, and particularly relates to a method for treating sintering waste gas of an optical fiber preform.
Background
The process mode of 'spraying alkaline washing chlorine/dynamic wave scrubber + absorption tower' is mainly adopted for treating waste gas after sintering in the optical fiber preform industry, and a plurality of problems exist in the actual operation process. Such as large occupied area, low absorption efficiency, easy blockage, unfavorable safety and personnel health and the like. Chlorine-containing waste gas and air from sintering, gas cabinets and the like are collected by an air duct and discharged to a sintering waste gas treatment system. Normally, the contaminant in the gas is chlorine. The sintering waste gas treatment process mainly comprises a process of spraying alkali and washing a chlorine/dynamic wave washer and an absorption tower. The waste gas flows from top to bottom in the kinetic wave reverse spraying section, and the alkali liquor is sprayed into the gas flow from bottom to top, so that the momentum of the alkali liquor and the momentum of the gas are balanced, and a layer of foam area is formed in the area where the gas passes through. The region is a strong turbulent region, the liquid surface of the region is updated quickly, so that the dynamic wave scrubber can effectively absorb the waste gas. Meanwhile, the waste gas can be cooled and dedusted. And the waste gas after temperature removal and dust removal enters an alkali liquor absorption tower. Chlorine-containing waste gas is absorbed again by alkali liquor in the alkali washing tower, and the waste gas reaching the standard is discharged through a chimney.
The prior art generally has low absorption efficiency. The prior art can not achieve the ideal unpicking and washing effect, and is not beneficial to safety and health. Because there is no venturi siphon effect, stable negative pressure cannot be formed in the upstream air pipe (under the condition of equipment faults such as a fan and the like), certain air suction quantity cannot be maintained, and highly toxic gas in the air pipe can escape to the surrounding space (in a workshop), so that great potential safety hazards and risks exist. The prior art is not energy-saving, environment-friendly, large in water consumption and uneconomical. The floor space is large, the operation is complex, the structural layout is wide, and the field installation is complex. The system is easy to block during operation. A large amount of pollutants (gas or dust) cannot be removed, the load of the packing alkaline washing tower is greatly increased (the packing is easy to block), and the operation cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the defects in the prior art, the method for treating the sintering waste gas of the optical fiber perform is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for treating sintering waste gas of an optical fiber preform comprises the following steps:
step 10, gas enters a Venturi scrubbing tower, and gas pollutants and sprayed liquid are contacted in a Venturi throat pipe to generate mass transfer;
step 20, absorbing the gas pollutants into spraying liquid;
step 30, the gas after primary purification enters a filler washing tower to be absorbed and neutralized by circulating alkali liquor again, and sintering waste gas reaches the allowable emission standard;
and step 40, adding high-efficiency filler into the filler washing tower, wherein the adding amount of the 30% alkali solution is controlled by ORP.
And step 50, when the set value is reached, discharging waste water into the regulating tank, and supplementing fresh water into the tower kettle to supplement the liquid level.
And step 60, the purified gas passes through a fan and then is discharged into the atmosphere through a chimney.
In one embodiment, the step 40 includes:
the concentration of soluble salt generated by the neutralization reaction is controlled by a conductivity meter.
In one embodiment, the step 60 includes:
and automatically adjusting the frequency of the guide fan according to the pressure of the upstream air pipe.
The invention has the beneficial effects that: the invention has high absorption efficiency, adopts two-stage absorption of the Venturi filler integrated tower, and ensures that the exhaust emission is lower than the strictest national emission standard; the negative pressure air-conditioning system is beneficial to safety and health, and can form stable negative pressure in an upstream air pipe (under the condition of fan failure) due to the venturi siphon effect, so that a small amount of air draft is kept, and hazardous gas in the air pipe cannot escape to the surrounding space (in a workshop).
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
Fig. 1 is a schematic flow chart of a method according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A method for treating sintering waste gas of an optical fiber preform comprises the following steps:
step 10, gas enters a Venturi scrubbing tower, and gas pollutants and sprayed liquid are contacted in a Venturi throat pipe to generate mass transfer;
step 20, absorbing the gas pollutants into spraying liquid;
step 30, the gas after primary purification enters a filler washing tower to be absorbed and neutralized by circulating alkali liquor again, and sintering waste gas reaches the allowable emission standard;
and step 40, adding high-efficiency filler into the filler washing tower, wherein the adding amount of the 30% alkali solution is controlled by ORP.
And step 50, when the set value is reached, discharging waste water into the regulating tank, and supplementing fresh water into the tower kettle to supplement the liquid level.
And step 60, the purified gas passes through a fan and then is discharged into the atmosphere through a chimney.
In one embodiment, the step 40 includes:
the concentration of soluble salt generated by the neutralization reaction is controlled by a conductivity meter.
In one embodiment, the step 60 includes:
and automatically adjusting the frequency of the guide fan according to the pressure of the upstream air pipe.
The specific process comprises the steps of collecting chlorine-containing waste gas and air from sintering, a gas holder and the like through air pipes and discharging the chlorine-containing waste gas and the air to the system, wherein the system adopts a novel process of a Venturi and filler integrated tower. Normally, the contaminant in the gas is chlorine. The gas first enters a venturi scrubber where the gaseous contaminants come into violent contact with the sprayed liquid in the venturi throat, causing mass transfer. A large amount of gaseous pollutants is absorbed into the spray liquor. The gas after primary purification enters a filler washing tower to be absorbed and neutralized by circulating alkali liquor again, and sintering waste gas reaches the allowable discharge standard. The packed scrubber uses high efficiency packing. The amount of 30% caustic solution added is controlled by ORP. The concentration of soluble salt generated by the neutralization reaction is controlled by a conductivity meter. When the set value is reached, the waste water is discharged to the regulating tank. Fresh water is fed to the column bottom to replenish the liquid level. The purified gas passes through a fan and then is discharged into the atmosphere through a chimney, and the tail gas meets the allowable discharge standard. And automatically adjusting the frequency of the guide fan according to the pressure of the upstream air pipe. The system can also be used as an emergency treatment system in case of chlorine leakage.
The invention has the beneficial effects that: 1) the absorption efficiency is high. The two-stage absorption of the venturi and the integrative tower of packing is adopted in the scheme, and the tail gas emission is ensured to be lower than the strictest national emission standard.
2) Is beneficial to safety and health. Because the siphon effect of venturi can form stable negative pressure (under the condition of fan trouble) in the tuber pipe of upstream, keep a small amount of convulsions, the interior hazardous gas of tuber pipe can not escape to surrounding space (in the workshop factory building).
3) The system can also be used as an emergency absorption device of chlorine. When a large amount of chlorine is discharged, the chlorine reacts with alkali to release a large amount of heat, so that the chlorine cannot be directly absorbed by a packed tower. While venturi scrubbers are particularly suited for the removal of large, high-concentration, exothermic contaminants or particulates. In addition, the alkali liquor circulating tank is stored with enough alkali liquor to neutralize the absorbed chlorine.
4) The process is well controlled. The water inlet, the water discharge and the alkali addition are all automatically controlled. The wastewater discharge concentration is stable.
5) The occupied area is small. The Venturi tower and the packed tower are all placed on the top of the alkali liquor circulating tank, and the structural layout is compact. And the field installation is simple.
6) Not easy to be blocked and low in operation cost. The Venturi serves as pretreatment equipment, a large amount of pollutants (gas or dust) are removed, and the load of the filler alkaline washing tower is reduced (the filler is compared)
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. The method for treating the sintering waste gas of the optical fiber preform is characterized by comprising the following steps of:
step 10, gas enters a Venturi scrubbing tower, and gas pollutants and sprayed liquid are contacted in a Venturi throat pipe to generate mass transfer;
step 20, absorbing the gas pollutants into spraying liquid;
step 30, the gas after primary purification enters a filler washing tower to be absorbed and neutralized by circulating alkali liquor again, and sintering waste gas reaches the allowable emission standard;
step 40, adding high-efficiency filler into the filler washing tower, wherein the adding amount of 30% alkali solution is controlled by ORP;
step 50, when the set value is reached, waste water is discharged into a regulating tank, and fresh water is supplemented into a tower kettle to supplement the liquid level;
and step 60, the purified gas passes through a fan and then is discharged into the atmosphere through a chimney.
2. The method of claim 1, wherein the step 40 comprises:
the concentration of soluble salt generated by the neutralization reaction is controlled by a conductivity meter.
3. The method of claim 1, wherein the step 60 comprises:
and automatically adjusting the frequency of the guide fan according to the pressure of the upstream air pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010380606.8A CN113617188A (en) | 2020-05-08 | 2020-05-08 | Sintering waste gas treatment method for optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010380606.8A CN113617188A (en) | 2020-05-08 | 2020-05-08 | Sintering waste gas treatment method for optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113617188A true CN113617188A (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010380606.8A Pending CN113617188A (en) | 2020-05-08 | 2020-05-08 | Sintering waste gas treatment method for optical fiber preform |
Country Status (1)
| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731605A (en) * | 2016-12-29 | 2017-05-31 | 临沂圣大环保工程有限公司 | Nitrate method phosphoric acid plant vent gas from reaction tank processing unit and method |
| CN107051159A (en) * | 2017-05-08 | 2017-08-18 | 内蒙古君正化工有限责任公司 | A kind of chlorine cyclic absorption equipment |
-
2020
- 2020-05-08 CN CN202010380606.8A patent/CN113617188A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731605A (en) * | 2016-12-29 | 2017-05-31 | 临沂圣大环保工程有限公司 | Nitrate method phosphoric acid plant vent gas from reaction tank processing unit and method |
| CN107051159A (en) * | 2017-05-08 | 2017-08-18 | 内蒙古君正化工有限责任公司 | A kind of chlorine cyclic absorption equipment |
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