CN111013353A - Treatment process of fluorite drying tail gas - Google Patents
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- CN111013353A CN111013353A CN201911346292.3A CN201911346292A CN111013353A CN 111013353 A CN111013353 A CN 111013353A CN 201911346292 A CN201911346292 A CN 201911346292A CN 111013353 A CN111013353 A CN 111013353A
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Abstract
The invention relates to a fluorite drying tail gas treatment process, which comprises the following steps: the fluorite drying tail gas is firstly dedusted, then high boiling point organic matters in the tail gas are condensed and liquefied through cooling and condensation and then discharged, then the tail gas is circularly washed and desulfurized under the action of an alkaline solution, and finally the washed tail gas is subjected to peculiar smell treatment and then is discharged after reaching the standard. The invention realizes the effective treatment of dust, sulfur dioxide and organic matters in the fluorite drying tail gas, and the content of each pollution factor in the emptying tail gas meets the latest environmental protection requirement. According to the invention, the smoke is cooled and condensed, and high-boiling-point organic matters in the smoke are separated, so that the content of the organic matters entering the tail gas peculiar smell treatment facility is greatly reduced, and the operation cost and the early equipment investment of the peculiar smell advanced treatment facility are greatly reduced.
Description
Technical Field
The invention relates to a treatment process of fluorite drying tail gas, and belongs to the field of tail gas treatment.
Background
Fluorite, also called fluorite, is a mineral, an isometric crystal system, the main component of which is calcium fluoride (molecular formula CaF)2) The appearance is white, yellow, purple, green and the like due to different impurity mixtures such as iron, aluminum, silicon, calcium, sulfur and the like. Fluorite is mostly used for preparing hydrofluoric acid, thereby further preparing fluorine-containing inorganic salts and fluorine-containing organic chemicals. In hydrofluoric acid production, the moisture content of fluorite is required to be strictly controlled to be lower than a certain level, so that the fluorite needs to be dried. The fluorite drying tail gas contains a large amount of dust and a small amount of sulfur dioxide; in addition, fluorite contains a small amount of flotation agents (mostly high-boiling-point organic matters such as oleic acid and the like), so that fluorite drying tail gas contains non-methane total hydrocarbon organic matters, and the over-high content of the non-methane total hydrocarbon organic matters is just the main reason for peculiar smell of the fluorite drying tail gas.
Chinese patent document CN 108815961A discloses a process for treating fluorite drying tail gas, and the invention can effectively remove dust, sulfur dioxide and organic matters in the fluorite drying tail gas through processes of dust removal, alkali washing and UV photolysis catalysis. However, the process disclosed in the patent does not relate to pretreatment of organic matters in tail gas, and has the defects of high UV photolysis catalytic load, poor odor removal effect after long-term use, large equipment investment and high operation cost.
Therefore, the development of the fluorite drying tail gas treatment process with low investment and low operation cost has important significance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a treatment process of fluorite drying tail gas, which can effectively condense and liquefy organic matters with high boiling point in the fluorite drying tail gas and then separate the organic matters, remove peculiar smell in the tail gas, reduce the environmental protection treatment cost of enterprises and improve the economic benefits of the enterprises.
The technical scheme of the invention is as follows:
a treatment process of fluorite drying tail gas comprises the following steps:
the fluorite drying tail gas is firstly dedusted, then high boiling point organic matters in the tail gas are condensed and liquefied through cooling and condensation and then discharged, then the tail gas is circularly washed and desulfurized under the action of an alkaline solution, and finally the washed tail gas is subjected to peculiar smell treatment and then is discharged after reaching the standard.
According to the invention, the temperature of the fluorite drying tail gas after temperature reduction and condensation is preferably 15-75 ℃.
According to the invention, the alkaline solution is preferably NaOH solution or KOH solution, the pH value is 9-14, and the temperature is 10-50 ℃. So as to ensure that the alkaline washing absorption efficiency of the washing tower reaches the best.
According to the invention, the peculiar smell treatment is UV photolysis catalysis or activated carbon adsorption.
According to the invention, the preferable treatment process of the fluorite drying tail gas is carried out by adopting the following treatment devices:
the treatment device comprises a cyclone dust collector, a bag-type dust collector, a cooling and condensing device, a washing device, an odor treatment device and a chimney; the cyclone dust collector, the bag-type dust collector, the cooling and condensing device, the washing device, the peculiar smell treatment device and the chimney are sequentially connected; the cooling condensing device comprises a flue gas heat exchanger and a gas-liquid separator which are connected in series; the washing device comprises a washing tower, a washing circulating pump and a washing liquid heat exchanger; the washing circulating pump is connected with the bottom of the washing tower, the washing liquid heat exchanger is connected with the top of the washing tower, and the washing circulating pump is connected with the washing liquid heat exchanger to form a circulating loop;
the method comprises the following steps:
the method comprises the steps of sequentially introducing fluorite tail gas to be treated into a cyclone dust collector and a bag-type dust collector to recover large-particle fluorite in the tail gas, then enabling the large-particle fluorite to enter a flue gas heat exchanger to enable water vapor and high-boiling-point organic matters in the tail gas to be condensed and liquefied, separating the condensed and liquefied organic matters through a gas-liquid separator and then discharging the condensed and liquefied organic matters, arranging an alkaline solution in a washing tower, pumping the alkaline solution into a washing liquid heat exchanger through a washing circulating pump to heat, then entering the washing tower from the top of the washing tower to circularly wash the fluorite tail gas subjected to gas-liquid separation, removing gases such as.
According to the invention, the filtering wind speed of the bag-type dust collector is preferably 0.3-2.0 m/s.
According to the invention, preferably, the flue gas heat exchanger is a tubular heat exchanger, and the outer diameter of a heat exchange tube of the tubular heat exchanger is
Or
Further preferably, the wall thickness of the heat exchange tube is 2-6 mm, and the heat exchange tube is made of carbon steel or stainless steel.
According to the invention, the gas-liquid separator is preferably a cyclone separator.
According to the invention, the washing tower is a packing tower; preferably, the packing is a plastic pall ring, a Raschig ring, a ladder ring, a Heil ring or a wire mesh corrugated pipe, the height of the packing is 8-12 m, and the air velocity of the empty tower is 0.8-5.0 m/s.
According to the invention, the washing liquid heat exchanger is preferably a tubular heat exchanger or a plate heat exchanger and is made of carbon steel or stainless steel.
The invention has the technical characteristics that:
according to the invention, the fluorite drying tail gas is cooled to 15-75 ℃, the characteristics of different organic matter boiling point distributions in the tail gas are utilized, so that non-methane total hydrocarbon organic matters which mainly generate peculiar smell in the tail gas are condensed and liquefied for gas-liquid separation, more than 70% of the non-methane total hydrocarbon organic matters are removed before the tail gas is washed, peculiar smell substances in the tail gas are greatly reduced, and the problem of incomplete peculiar smell treatment caused by overhigh concentration of the non-methane total hydrocarbon organic matters in the tail gas at the front end is avoided in subsequent peculiar smell treatment.
The invention has the beneficial effects that:
(1) according to the invention, the fluorite drying tail gas is subjected to dust removal, cooling condensation, washing and advanced treatment and then is discharged at high altitude, so that the effective treatment of large-particle dust, sulfur dioxide, organic matters and peculiar smell gas in the fluorite drying tail gas is realized, and the concentration of particulate matters in the treated tail gas is reduced to 10mg/m3The sulfur dioxide is reduced to 30mg/m3The concentration of non-methane total hydrocarbon organic matters is reduced to 5mg/m3The latest environmental requirements are satisfied below.
(2) According to the invention, the fluorite drying tail gas is cooled and condensed, and the high-boiling-point organic matters in the fluorite drying tail gas are condensed and liquefied and then separated, so that the total flow of the tail gas and the content of the organic matters in the tail gas are greatly reduced, the washing and advanced treatment pressure in the subsequent process is reduced, the operation cost and the early equipment investment of the washing tower and the advanced treatment device are reduced, the service lives of the washing tower and the advanced treatment device are prolonged, and the popularization and the application of the fluorite drying tail gas treatment process are facilitated.
(3) The invention provides an effective and reliable fluorite drying tail gas treatment process with low investment and low operation cost, reduces the environmental protection treatment cost of enterprises, improves the economic benefit of the enterprises, and makes positive contribution to the environmental protection.
Drawings
FIG. 1 is a schematic view of a device for treating fluorite drying tail gas in the present invention.
In the figure: 1-cyclone dust collector; 2-bag dust collector; 3-flue gas heat exchanger; 4-a gas-liquid separator; 5-a washing tower; 6-washing circulating pump; 7-washing liquid heat exchanger; 8-a peculiar smell treatment device; 9-a draught fan; 10-chimney.
Detailed description of the invention
The invention is further described below by way of specific application examples in conjunction with the accompanying drawings, but is not limited thereto.
Example 1
A treatment process of fluorite drying tail gas comprises the following steps:
the fluorite drying tail gas is firstly dedusted, then high-boiling-point organic matters in the tail gas are condensed and liquefied through cooling and condensation and then discharged, then the tail gas is circularly washed and desulfurized under the action of an alkaline solution, and finally the tail gas after washing is subjected to peculiar smell treatment and then is discharged after reaching the standard.
Wherein the temperature of the fluorite drying tail gas after cooling and condensation is controlled to be 15-75 ℃, the alkaline solution is NaOH solution, the pH value is 10, and the temperature is 30 ℃, so that the best alkaline washing absorption efficiency of the washing tower is ensured.
The peculiar smell treatment is UV photolysis catalysis.
Example 2
As shown in fig. 1, a treatment process of fluorite drying tail gas is performed by adopting the following treatment devices:
the treatment device comprises a cyclone dust collector 1, a bag-type dust collector 2, a cooling and condensing device, a washing device, an odor treatment device 8 and a chimney 10; the cyclone dust collector 1, the bag-type dust collector 2, the cooling and condensing device, the washing device, the peculiar smell processing device 8 and the chimney 10 are sequentially connected; the cooling condensing device comprises a flue gas heat exchanger 3 and a gas-liquid separator 4 which are connected in series; the washing device comprises a washing tower 5, a washing circulating pump 6 and a washing liquid heat exchanger 7; the washing circulating pump 6 is connected with the bottom of the washing tower 5, the washing liquid heat exchanger 7 is connected with the top of the washing tower 5, and the washing circulating pump 6 is connected with the washing liquid heat exchanger 7 to form a circulating loop;
peculiar smell processing apparatus 8 and chimney 10 between still be provided with draught fan 9, peculiar smell processing apparatus 8 be UV photodissociation catalytic cleaner.
The filtering air speed of the bag-type dust collector 2 is 0.3-2.0 m/s, the flue gas heat exchanger 3 is a tubular heat exchanger, and the outer diameter of a heat exchange tube of the tubular heat exchanger is
The wall thickness of the heat exchange tube is 4mm, and the heat exchange tube is made of carbon steel.
The gas-liquid separator 4 is a cyclone separator; the washing tower 5 is a packed tower; the filler is a plastic pall ring, the height of the filler is 10m, and the air speed of the empty tower is 3 m/s;
the method comprises the following steps:
the method comprises the steps of sequentially introducing fluorite tail gas to be treated into a cyclone dust collector 1 and a bag-type dust collector 2 to recover large-particle fluorite in the tail gas, then introducing the fluorite tail gas into a flue gas heat exchanger 3 to condense and liquefy water vapor and high-boiling-point organic matters in the tail gas, separating the condensed and liquefied organic matters through a gas-liquid separator 4 and discharging the condensed and liquefied organic matters, arranging an alkaline solution in a washing tower 5, pumping the alkaline solution into a washing liquid heat exchanger 7 through a washing circulating pump 6 to heat, then entering the washing tower 5 from the top of the washing tower 5 to circularly wash the fluorite tail gas subjected to gas-liquid separation, removing gases such as sulfur dioxide, removing peculiar smell through.
Example 3
The difference is that the odor treatment device 8 adopts an activated carbon adsorption device as in example 2.
Example 4
The process is as described in example 2 except that the basic solution is a KOH solution, pH 11 and temperature 25 ℃.
Comparative example 1
The difference is that the cooling and condensing treatment is not carried out, and the whole process flow comprises the steps of dust removal, washing, peculiar smell treatment and high-altitude discharge.
Test examples
When the fluorite drying tail gas treatment is carried out in the processes of example 2 and comparative example 1, the concentrations of particulate matters, sulfur dioxide and non-methane total hydrocarbon organic matters at each position are detected, and the results are shown in tables 1 and 2. The concentration of the particulate matters in the fluorite drying tail gas to be treated is 20000mg/m3The sulfur dioxide concentration is 115mg/m3The concentration of non-methane total hydrocarbon organic matters is 130mg/m3。
Table 1 results of exhaust gas detection at each position in example 2
Table 2 results of tail gas detection at each position in comparative example 1
By comparing the results of the analysis of the tail gas in the positions shown in table 1, the removal rate of the particulate matters in the flue gas heat exchanger, the gas-liquid separator and the washing tower reaches 25.0%, the removal rate of the sulfur dioxide reaches 75.7%, the removal rate of the non-methane total hydrocarbon organic matters reaches 83.1%, and the content of each pollution factor in the treated tail gas meets the latest ultralow emission requirement.
As can be seen by comparing Table 1 and Table 2, the concentration of the organic matters other than methane total hydrocarbons at the outlet of the bag-type dust collector of comparative example 1, i.e. the inlet of the washing tower, reaches 130mg/m3In example 2, after temperature reduction and condensation, the concentration of non-methane total hydrocarbon organic matters at the outlet of the gas-liquid separator is only 35mg/m3. 105mg/m compared to comparative example 13The method reduces 73.1 percent, avoids the problem of incomplete peculiar smell treatment caused by overhigh concentration of non-methane total hydrocarbon organic matters contained in the tail gas at the front end in the subsequent peculiar smell treatment, greatly reduces the operation load of a peculiar smell treatment device, greatly reduces the operation cost and the early equipment investment of the peculiar smell treatment device, prolongs the service lives of a washing tower and an advanced treatment device, and is more favorable for popularization and application of a fluorite drying tail gas treatment process.
Claims (10)
1. A treatment process of fluorite drying tail gas comprises the following steps:
the fluorite drying tail gas is firstly dedusted, then high boiling point organic matters in the tail gas are condensed and liquefied through cooling and condensation and then discharged, then the tail gas is circularly washed and desulfurized under the action of an alkaline solution, and finally the washed tail gas is subjected to peculiar smell treatment and then is discharged after reaching the standard.
2. The fluorite drying tail gas treatment process as claimed in claim 1, wherein the temperature of the fluorite drying tail gas after cooling and condensation is 15-75 ℃.
3. The process for treating fluorite drying tail gas as claimed in claim 1, wherein the alkaline solution is NaOH solution or KOH solution, the pH value is 9-14, and the temperature is 10-50 ℃.
4. The process for treating fluorite drying tail gas as claimed in claim 1, wherein the odor treatment is UV photolysis catalysis or activated carbon adsorption.
5. The process for treating fluorite drying tail gas as claimed in claim 1, wherein the process for treating fluorite drying tail gas is carried out by adopting the following treatment devices:
the treatment device comprises a cyclone dust collector, a bag-type dust collector, a cooling and condensing device, a washing device, an odor treatment device and a chimney; the cyclone dust collector, the bag-type dust collector, the cooling and condensing device, the washing device, the peculiar smell treatment device and the chimney are sequentially connected; the cooling condensing device comprises a flue gas heat exchanger and a gas-liquid separator which are connected in series; the washing device comprises a washing tower, a washing circulating pump and a washing liquid heat exchanger; the washing circulating pump is connected with the bottom of the washing tower, the washing liquid heat exchanger is connected with the top of the washing tower, and the washing circulating pump is connected with the washing liquid heat exchanger to form a circulating loop;
the method comprises the following steps:
the method comprises the steps of sequentially introducing fluorite tail gas to be treated into a cyclone dust collector and a bag-type dust collector to recover large-particle fluorite in the tail gas, then introducing the fluorite tail gas into a flue gas heat exchanger to condense and liquefy water vapor and high-boiling-point organic matters in the tail gas, separating the organic matters by a gas-liquid separator, discharging the organic matters, pumping alkaline solution into a washing liquid heat exchanger by a washing circulating pump in a washing device for heating, then entering a washing tower from the top of the washing tower to circularly wash the fluorite tail gas subjected to gas-liquid separation, removing gases such as sulfur dioxide, removing peculiar smell by a peculiar smell treatment device.
6. The fluorite drying tail gas treatment process according to claim 5, wherein the filtering wind speed of the bag-type dust collector is 0.3-2.0 m/s.
7. The process for treating fluorite drying tail gas as claimed in claim 5, wherein the flue gas heat exchanger is a tubular heat exchanger, and the outer diameter of a heat exchange tube of the tubular heat exchanger is
Or
Further preferably, the wall thickness of the heat exchange tube is 2-6 mm, and the heat exchange tube is made of carbon steel or stainless steel.
8. The process for treating fluorite stoving tail gas as set forth in claim 5, wherein the gas-liquid separator is a cyclone separator.
9. The process for treating fluorite stoving tail gas as set forth in claim 5, wherein the washing tower is a packed tower; preferably, the packing is a plastic pall ring, a Raschig ring, a ladder ring, a Heil ring or a wire mesh corrugated pipe, the height of the packing is 8-12 m, and the air velocity of the empty tower is 0.8-5.0 m/s.
10. The process for treating fluorite drying tail gas as claimed in claim 5, wherein the washing liquid heat exchanger is a tubular heat exchanger or a plate heat exchanger, and is made of carbon steel or stainless steel.
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Cited By (5)
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| CN111437708A (en) * | 2020-05-15 | 2020-07-24 | 四川轻化工大学 | Multifunctional VOC (volatile organic compound) gas barrier system |
| CN111514703A (en) * | 2020-04-30 | 2020-08-11 | 上海化工研究院有限公司 | Deep purification treatment device and process for tail gas discharged by fiberboard production line |
| CN111632464A (en) * | 2020-06-17 | 2020-09-08 | 中山市美亮美机电设备有限公司 | Industrial baking waste gas purification system |
| CN112604431A (en) * | 2020-11-19 | 2021-04-06 | 衡阳鸿宇化工有限责任公司 | Tail gas treatment device for aluminum trichloride production and use method thereof |
| CN113521943A (en) * | 2021-06-29 | 2021-10-22 | 宁波明讯实业有限公司 | Small-air-volume automobile spray paint and automobile plastic modified waste gas treatment process |
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