CN212262785U - Device for recovering high-purity SiO2 and hydrochloric acid - Google Patents
Device for recovering high-purity SiO2 and hydrochloric acid Download PDFInfo
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- CN212262785U CN212262785U CN202021099478.1U CN202021099478U CN212262785U CN 212262785 U CN212262785 U CN 212262785U CN 202021099478 U CN202021099478 U CN 202021099478U CN 212262785 U CN212262785 U CN 212262785U
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Abstract
The utility model provides a retrieve device of high-purity SiO2 and hydrochloric acid, including consecutive exhaust gas pipe, solid recovery unit and sour gas purifier, solid recovery unit deposits the recovery with the granule separation in the gas, obtains particulate matter SiO2 GeO2, sour gas purifier passes through two-stage hydrochloric acid absorption tower and purifies gas to obtain the hydrochloric acid product, the gas after the purification is passed through the fan and is drawn to exhaust chimney high altitude and discharge. The water consumption of the utility model is greatly reduced, which is only 0-20% of the water consumption of the prior proposal, and no waste water is discharged, thus treating waste gas and protecting environment, and achieving the purposes of energy saving and emission reduction; the utility model does not need to use alkali liquor, has no additional pollution, greatly reduces the operating cost of the device and reduces the cost; the utility model can recover high-purity hydrochloric acid solution with higher concentration, and increase the income of accessories; the utility model discloses recoverable pollution-free SiO2, the GeO2 particulate matter that obtains increases the annex income.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, especially, relate to a retrieve device of high-purity SiO2 and hydrochloric acid.
Background
At present, the method of vapor deposition is adopted in the production of core rods in the optical communication industry, and the production process comprises the following steps: the method comprises the steps of core rod deposition, core rod sintering and degassing, core rod extension, core rod data detection, core rod connection, cladding deposition, cladding sintering and degassing, optical fiber preform data detection and warehousing and the like.
In the deposition process, SiCl4 and GeCl4 complete hydrolysis reaction in high-temperature flame to generate SiO2 and GeO2, and the SiO2 and the GeO2 are deposited on the outer surface of the rotating target rod, wherein H2 and O2 are excessive in the reaction process, SiCl4 is used as a main raw material, and GeCl4 is used as a doping agent. The process is carried out in a closed cavity, and the main pollutants of the generated reaction waste gas are quartz dust (SiO2 and GeO2) and HCl which are pumped to a waste gas treatment system of a comprehensive treatment station through an exhaust pipeline.
The degassing process is that the furnace is firstly purged by N2, the temperature is raised to 1200 ℃, and then mixed gas of Cl2 and He is introduced for dehydration. Cl2 reacted as a dehydration gas. The dehydration sintering process is carried out in a closed cavity, main pollutants of generated reaction waste gas are HCl and Cl2, and the reaction waste gas is pumped to a waste gas treatment system of a comprehensive treatment station through an exhaust pipeline.
At present, the process of optical cable production in the optical communication transmission material industry and the metal cable industry adopts a vapor deposition method, tail gas is generated in the process, and the main components of the tail gas are HCL, SIO2, H2O, N2, O2 and the like; at present, in the optical cable industry, two-stage wet-type electric dust removal and two-stage alkali washing acid removal methods are adopted for tail gas treatment, although the emission requirements can be met, the alkali consumption and water consumption are huge, the investment is huge, the generation is useless, the treated tail liquid can be only treated, and the method is neither environment-friendly nor can create revenue.
The current environmental protection scheme is only limited to converting harmful substances into harmless components to achieve standard emission, a large amount of capital is needed to be invested for achieving the purpose to maintain equipment operation, and extra emission is generated after treatment, so that the environmental protection scheme has no economic value. The traditional technology is that alkaline solution is added for neutralization for acid recovery, a large amount of waste salt solution is generated through acid-base reaction, the waste salt solution is allowed to be discharged in some areas at present, but the waste salt solution is not allowed to be discharged in many areas, if the waste salt solution is not allowed to be discharged, a multi-effect evaporation device is required to be added for treating the waste liquid into waste salt, the addition of the multi-effect evaporation device not only increases a huge investment, but also the waste salt still needs to be further treated. The waste salt belongs to industrial solid waste according to the national standard of the environmental protection and treatment law of solid waste pollution of the people's republic of China and GB50585-2007 general rules of hazardous waste identification standards. The current process generates a large amount of solid waste while treating the waste gas. In conclusion, the original method treats both symptoms and root causes, and is not environment-friendly and beneficial to generation.
Disclosure of Invention
In view of the above, the present invention is directed to a device for recovering high purity SiO2 and hydrochloric acid to solve the above mentioned problems in the background art.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a device for recovering high-purity SiO2 and hydrochloric acid comprises a waste gas exhaust pipe, a solid recovery device and an acid gas purification device which are sequentially connected, wherein particles in gas are separated, precipitated and recovered by the solid recovery device to obtain particulate matter SiO2/GeO2, the acid gas purification device purifies the gas by two stages of hydrochloric acid absorption towers to obtain hydrochloric acid products, and the purified gas is pulled to an exhaust chimney to be discharged at high altitude by a fan.
Further, a gas-solid separator is arranged in the solid recovery device and used for separating, settling and recovering the particulate matters, the gas inlet of the gas-solid separator is connected with a waste gas exhaust pipe, and the gas outlet of the gas-solid separator is connected with an acid gas purification device.
Furthermore, drying devices are arranged below ash buckets of the gas-solid separators and used for drying and recovering the recovered particles.
Further, the acid gas purification device comprises a first-stage hydrochloric acid absorption tower and a second-stage hydrochloric acid absorption tower which are connected with each other.
Furthermore, a pressure sensor and a flow sensor are arranged at the joint of the waste gas exhaust pipe and the solid recovery device.
And the monitoring center comprises an upper computer and is used for receiving data of the pressure sensor and the flow sensor and controlling the operating frequency of the fan.
Compared with the prior art, the device and the method for recovering high-purity SiO2 and hydrochloric acid have the following advantages:
(1) the water consumption of the utility model is greatly reduced, which is only 0-20% of the water consumption of the prior proposal, and no waste water is discharged, thus treating waste gas and protecting environment, and achieving the purposes of energy saving and emission reduction;
(2) the utility model does not need to use alkali liquor, has no additional pollution, greatly reduces the operating cost of the device and reduces the cost;
(3) the utility model can recover high-purity hydrochloric acid solution with higher concentration, and increase the income of accessories;
(4) the utility model discloses recoverable pollution-free SiO2, the GeO2 particulate matter that obtains increases the annex income.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a schematic diagram of an apparatus for recovering high purity SiO2 and hydrochloric acid according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for recovering high-purity SiO2 and hydrochloric acid according to an embodiment of the present invention.
Description of reference numerals:
1-a first gas-solid separator; 2-a second gas-solid separator; 3-a first hydrochloric acid absorption tower; 4-a secondary hydrochloric acid absorption tower; 5, a fan; 6-chimney.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. 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 present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1-2, a device for recovering high-purity SiO2 and hydrochloric acid comprises a waste gas exhaust pipe, a solid recovery device and an acid gas purification device which are connected in sequence, wherein the solid recovery device separates, precipitates and recovers particles in gas to obtain particulate matter SiO2/GeO2, the acid gas purification device purifies the gas after passing through a primary hydrochloric acid 3 absorption tower box and a secondary hydrochloric acid absorption tower 4 to obtain a hydrochloric acid product, and the purified gas is pulled to an exhaust chimney 6 to be discharged at high altitude through a fan 5.
Because the waste gas to be treated mainly contains dust (SiO2 and GeO2) and acid gas (HCL), the acid gas is treated by adopting an alkali neutralization mode; however, the dust to be treated is mainly SiO2 and GeO2, and can react with the alkali liquor to generate sodium silicate and sodium germanate, so that the alkali liquor becomes viscous, the fluidity is reduced, the risk of blockage is caused by circulating accumulation, therefore, dust needs to be removed firstly, the utility model enters a solid recovery device after tail gas containing acid and solid enters the solid recovery device, a gas-solid separator is arranged in the solid recovery device and comprises a first gas-solid separator 1 and a second gas-solid separator 2, in the embodiment, the gas-solid separator adopts a combination of a cyclone dust collector and a bag-type dust collector, when in use, the gas collecting pipe of the cyclone dust collector is connected with the waste gas exhaust pipe, the exhaust pipe of the cyclone dust collector is connected with the air inlet of the bag-type dust collector, the air outlet of the bag-type dust collector is connected with the acid gas purification device, wherein, cyclone is used for tentatively subsiding the recovery with the separation of large granule, reduces the impact of large granule to rear sack cleaner filter media, improves sack life. And the residual micro particles are further treated by adopting a bag-type dust collector to ensure that the particles SiO2 and GeO2 reach the standard and are discharged without entering a subsequent acid gas purification system. The solid recovery efficiency of the cyclone dust collector can reach about 70 percent, and the bag-type dust collector can realize the discharge reaching the standard when the content of particulate matters in the gas is lower than 30mg/m 3.
In this embodiment, in order to prevent the acid-containing tail gas from corroding the solid recovery device, a device shell of the cyclone dust collector is made of glass Fiber Reinforced Plastic (FRP); the equipment shell of the bag-type dust collector adopts carbon steel and an anticorrosive coating, and the filter material adopts needle felt plated PTFE.
The utility model discloses an ash bucket below of cyclone and sack cleaner all is equipped with drying device for carry out drying process to the particulate matter of retrieving, retrieve.
The residual acid-containing tail gas enters an acid gas purification device, the concentration of hydrochloric acid can be ensured due to first-stage absorption, but a part of HCL gas cannot be absorbed, so that the absorption of the HCL gas as the tail gas cannot reach the standard, a two-stage washing absorption scheme is adopted, and because the HCL is very soluble in water, water is adopted as an absorbent, the acid gas is introduced into a hydrochloric acid absorption tower, the water enters the tower from the top of the tower, the HCl continuously enters a water tank under the pushing of concentration difference, and a tower kettle obtains a high-purity hydrochloric acid solution. The effect of the two-stage water washing can ensure that HCL in the tail gas is discharged up to the standard. The hydrochloric acid absorption tower can absorb acidic components to recover pure hydrochloric acid products with the weight of 20-25%, and the hydrochloric acid products obtained by continuous operation enter a hydrochloric acid storage tank. Sent into a hydrochloric acid tank car by a delivery pump for sale or reuse. When the pure hydrochloric acid product is actually recovered, 10000m3/h of tail gas needs to be added with 0.4t/h of water, the gas amount is increased, and the water amount is increased by multiple times; with the increase of the gas quantity, the water consumption is slightly reduced because the water content in the tail gas is relatively increased.
The fan is controlled by a frequency converter, the pressure and the flow at the waste gas inlet are used as guidance, and the running state of the fan is controlled by adjusting the frequency to adapt to the running load of the production line.
The whole system of the electronic sensor (pressure/temperature/liquid level and the like) for collecting key parameters is controlled by a PLC (programmable logic controller), programming is matched with an actual process, configuration optimization man-machine interaction is realized, the system realizes automatic operation, operation is basically unattended, core data has a report function, the labor cost is reduced, and the labor intensity is reduced.
In this embodiment, the fan is pressed the setting entirely and is controlled the amount of wind of fan at any time at 6 ~ 7KPAG, presses the data that change according to the fan rear to control the amount of wind of fan, when pressing to change display data and being less than the rated value, then the fan amount of wind is little, need match the regulation to variable frequency fan, the utility model discloses an sour gas purification device needs PLC control: the interlocking control of the circulating pump and the liquid level and the interlocking control of the liquid level and the regulating valve;
when the liquid level is low time limit, through adjusting the flowing back regulating valve aperture of minifying, reduce out the liquid measure, open the water route regulating valve aperture, increase the quantity of water, when the liquid level is high time limit, through adjusting the flowing back regulating valve aperture of minifying, increase out the liquid measure, adjust the water route regulating valve aperture of minifying, reduce the quantity of water.
The utility model adopts a dry solid recovery device to recover the particulate SiO2/GeO2, does not pollute the subsequent hydrochloric acid solution after recovering the particulate, and does not influence the sale of hydrochloric acid; because the purity of SiO2/GeO2 generated in the flue gas is very high, if the flue gas is not polluted by alkali liquor, the flue gas is a better material after being dried, and certain economic benefit can be generated; after the particles are recovered, the emission of the smoke particles can reach the standard; secondly, 20-25% of hydrochloric acid products are recovered, and because the prior solid recovery facility is provided, and the purity of the HCL gas is very high, the quality of the recovered hydrochloric acid is very high, the sale of the hydrochloric acid can generate higher economic benefit, a large amount of alkali liquor can not be consumed, and the operation cost is saved; the two-stage hydrochloric acid absorption tower ensures that acid gas in tail gas and particulate indexes are discharged up to standard, and meets the requirement of environmental protection.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A device for recovering high-purity SiO2 and hydrochloric acid is characterized in that: including consecutive exhaust-gas line, solid recovery unit and sour gas purification device, the granule separation in the solid recovery unit will be gaseous deposits the recovery, obtains particulate matter SiO2/GeO2, sour gas purification device purifies gas through two-stage hydrochloric acid absorption tower to obtain hydrochloric acid product, the gas after the purification is drawn to exhaust stack high altitude through the fan and is discharged.
2. The device for recovering high-purity SiO2 and hydrochloric acid according to claim 1, wherein: the solid recovery device is internally provided with a gas-solid separator for separating, settling and recovering particulate matters, the gas inlet of the gas-solid separator is connected with a waste gas exhaust pipe, and the gas outlet of the gas-solid separator is connected with an acid gas purification device.
3. The device for recovering high-purity SiO2 and hydrochloric acid according to claim 2, wherein: and drying devices are arranged below the ash buckets of the gas-solid separators and are used for drying the recovered particles and recovering the particles.
4. The device for recovering high-purity SiO2 and hydrochloric acid according to claim 1, wherein: the acid gas purification device comprises a first-stage hydrochloric acid absorption tower and a second-stage hydrochloric acid absorption tower which are connected.
5. The device for recovering high-purity SiO2 and hydrochloric acid according to claim 1, wherein: and a pressure sensor and a flow sensor are arranged at the joint of the waste gas exhaust pipe and the solid recovery device.
6. The device for recovering high-purity SiO2 and hydrochloric acid according to claim 5, wherein: the monitoring center comprises an upper computer and is used for receiving data of the pressure sensor and the flow sensor and controlling the running frequency of the fan.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021099478.1U CN212262785U (en) | 2020-06-15 | 2020-06-15 | Device for recovering high-purity SiO2 and hydrochloric acid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021099478.1U CN212262785U (en) | 2020-06-15 | 2020-06-15 | Device for recovering high-purity SiO2 and hydrochloric acid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226066A (en) * | 2021-12-20 | 2022-03-25 | 中国建筑材料科学研究总院有限公司 | SiO recycled from tail gas2Method and apparatus for powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226066A (en) * | 2021-12-20 | 2022-03-25 | 中国建筑材料科学研究总院有限公司 | SiO recycled from tail gas2Method and apparatus for powder |
| CN114226066B (en) * | 2021-12-20 | 2024-04-12 | 中国建筑材料科学研究总院有限公司 | SiO recovered from tail gas 2 Method and device for powder |
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