CN111434372B - A method and device for treating prebaked anode roasting flue gas - Google Patents

A method and device for treating prebaked anode roasting flue gas Download PDF

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CN111434372B
CN111434372B CN201910033889.6A CN201910033889A CN111434372B CN 111434372 B CN111434372 B CN 111434372B CN 201910033889 A CN201910033889 A CN 201910033889A CN 111434372 B CN111434372 B CN 111434372B
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flue gas
desulfurization
defluorination
sodium hydroxide
nozzle
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CN111434372A (en
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王文博
宋海琛
刘竹昕
刘雅锋
李雪娇
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Shenyang Aluminium And Magnesium Engineering And Research Institute Co Ltd
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Shenyang Aluminium And Magnesium Engineering And Research Institute Co Ltd
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    • 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
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
    • 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/68—Halogens or halogen compounds

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Abstract

本发明公开一种治理预焙阳极焙烧烟气的方法及装置，来自培烧炉烟气从主管道进入脱硫除氟装置，在主管道的端部外设有雾化装置，氢氧化钠溶液自雾化装置的喷口喷出，氢氧化钠溶液与焙烧烟气在脱硫除氟装置中发生反应，所述喷口与主管道的圆形截面相切，脱硫除氟后的烟气通过输送管道进入到布袋除尘器中，布袋除尘器对烟气中的固体颗粒物进行脱除，烟气在经过脱硫除氟和颗粒物脱除之后通过引风机进入到烟囱,本发明的优点是：雾化后的脱硫除氟剂氢氧化钠喷淋到烟气中，由于氢氧化钠溶液喷口与烟道的走向相切，使得烟气在脱硫除氟装置中的走向变为螺旋状，更容易发生反应，提高了氢氧化钠溶液与酸性气体反应效率，整个过程无废液产生。

Figure 201910033889

The invention discloses a method and a device for treating pre-baked anode roasting flue gas. The flue gas from an incubator enters a desulfurization and defluorination device from a main pipeline, an atomizing device is arranged outside the end of the main pipeline, and a sodium hydroxide solution is automatically The nozzle of the atomization device is sprayed out, and the sodium hydroxide solution reacts with the roasting flue gas in the desulfurization and defluorination device. In the bag filter, the bag filter removes the solid particles in the flue gas, and the flue gas enters the chimney through the induced draft fan after desulfurization, defluorination and particle removal. The fluorine agent sodium hydroxide is sprayed into the flue gas. Since the nozzle of the sodium hydroxide solution is tangent to the flue, the flue gas in the desulfurization and defluorination device becomes a spiral, which is more likely to react and improve the hydrogen The reaction efficiency of sodium oxide solution and acid gas, no waste liquid is produced in the whole process.

Figure 201910033889

Description

Method and device for treating flue gas generated by roasting of prebaked anode
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a method for treating carbon roasting flue gas.
Background
In the electrolytic aluminum industry, roasting is an important process in the production process of carbon products, and the main pollutant in the production process of prebaked anodes is roasting smoke. The flue gas contains harmful substances such as fluoride, dust, sulfur dioxide and the like, and can cause harm to animals and plants, particularly, the acidic gases such as sulfur dioxide and hydrogen fluoride have strong corrosivity, so that the flue gas not only can cause harm to human bodies, but also can cause corrosive influence on production equipment and the like. Therefore, the roasting flue gas of the carbon plant can be discharged only after being desulfurized, defluorinated and dedusted by the flue gas purification system.
At present, the roasting flue gas is collected by an electric tar precipitator to collect tar and most of dust in the flue gas, and then is desulfurized and defluorinated by a desulfurizing and defluorinating device, and finally the dust in the flue gas is removed by a dedusting device.
The traditional process route has long flow and high investment cost, and the temperature of the flue gas needs to be reduced for the trapping efficiency of the electrical tar precipitator, thereby causing energy waste. Meanwhile, in recent years, due to the continuous improvement of a burning control system of the roasting furnace, the amount of tar contained in roasting smoke is very low, and an electric tar precipitator cannot play the main role of the tar, so that the equipment investment is wasted.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method and a device for treating prebaked anode roasting flue gas, and the specific technical scheme is as follows:
a method for treating flue gas from a prebaked anode roasting device comprises the steps that flue gas from a roasting furnace enters a desulfurization and defluorination device from a main pipeline, an atomization device is arranged outside the end part of the main pipeline, a sodium hydroxide solution is sprayed out from a nozzle of the atomization device, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device to carry out desulfurization and defluorination on the roasting flue gas; the spout is tangent with the circular cross-section of trunk line, and the flue gas after the desulfurization defluorination enters into the sack cleaner through pipeline, and the sack cleaner carries out the desorption to the solid particulate matter in the flue gas, and the flue gas discharges in the atmosphere after entering into the chimney through the draught fan after desulfurization defluorination and particulate matter desorption.
The inner wall of the conveying pipeline is provided with heating rods, and the heating rods are arranged on the inner wall of the conveying pipeline in a crossed mode.
The invention further discloses a device for realizing the method, which is provided with a main pipeline, wherein one end of the main pipeline is connected with a flue gas outlet of the roasting furnace, the other end of the main pipeline is connected with the end part of the desulfurization and defluorination device, the end part of the main pipeline is externally provided with an atomization device, a sodium hydroxide solution is sprayed out from a nozzle of the atomization device, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device to perform desulfurization and defluorination on the roasting flue gas; the spout is tangent with the circular cross-section of trunk line, and the below of desulfurization defluorinating device is connected in pipeline's one end, the other end of conveyer pipe is connected on the sack cleaner, and the vent in draught fan is connected to one side of sack cleaner, and the air outlet of draught fan is connected in the chimney.
The number of the nozzles is multiple.
The inner wall of the desulphurization and defluorination device is provided with a spiral groove.
The spiral groove head is arranged corresponding to the nozzle of the atomization device, and the tail is arranged corresponding to the end of the conveying pipeline.
The invention has the advantages that: the atomized sodium hydroxide solution of the desulfurization and defluorination agent is sprayed into flue gas, and the trend of the flue gas in the desulfurization and defluorination device is changed into spiral shape due to the tangent trend of the sodium hydroxide solution nozzle and the flue, so that the flue gas is easy to react, the reaction time is prolonged, the reaction efficiency of the sodium hydroxide solution and the acid gas is improved, and no waste liquid is generated in the whole process.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
fig. 2 is a schematic view of the cross-sectional structure a-a of fig. 1.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings, as shown in fig. 1 and fig. 2, a method for treating flue gas from a prebaked anode roasting furnace, the flue gas from the roasting furnace enters a desulfurization and defluorination device 2 from a main pipeline 1, an atomization device 4 is arranged outside the end part of the main pipeline 1, a sodium hydroxide solution is sprayed out from a nozzle 3 of the atomization device 4, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device 2 to perform desulfurization and defluorination on the roasting flue gas; because spout 3 is tangent with the circular cross-section of trunk line 1, consequently, the flue gas that comes from trunk line 1 is different with the sodium hydroxide wind direction that comes from atomizing device spout 3, produce spiral wind direction in desulfurization defluorinating device 2, and spiral groove along in the desulfurization defluorinating device 2 flows, not only can increase the active area like this, can also prolong reaction time, flue gas after the desulfurization defluorinating passes through conveying pipeline 8 and enters into sack cleaner 5, sack cleaner 5 carries out the desorption to the solid particulate matter in the flue gas, after flue gas enters into chimney 7 through draught fan 6 after desulfurization defluorinating and particulate matter desorption, discharge in the atmosphere.
The inner wall of the conveying pipeline 8 is provided with the heating rods 9, the heating rods 9 are arranged on the inner wall of the conveying pipeline 8 in a crossed mode, and the light and small dust (below 1 micron) moves along with the airflow and is very close to the airflow streamline and can bypass fibers. However, after the filter material is collided by gas molecules which do thermal motion (namely Brownian motion), the original motion direction is changed, the contact chance of dust and fibers is increased, the dust can be captured, and when the diameter of the filter material fibers is thinner, the porosity is smaller, the capture rate is higher, and therefore the filter material is more beneficial to dust removal.
The invention further discloses a device for realizing the method, which is provided with a main pipeline 1, wherein one end of the main pipeline 1 is connected with a flue gas outlet of a roasting furnace, the other end of the main pipeline is connected with the end part of a desulfurization and defluorination device 2, an atomization device 4 is arranged outside the end part of the main pipeline 1, a sodium hydroxide solution is sprayed out from a nozzle 3 of the atomization device 4, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device 2 to perform desulfurization and defluorination on the roasting flue gas; spout 3 is tangent with the circular cross-section of trunk line 1, and the below of desulfurization defluorinating device 2 is connected in pipeline 8's one end, pipeline 8's the other end is connected on sack cleaner 5, and the vent in draught fan 6 is connected to one side of sack cleaner 5, and the air outlet of draught fan 6 is connected in chimney 7.
The number of the spouts 3 is plural.
The inner wall of the desulphurization and defluorination device 2 is provided with a spiral groove.
The spiral groove head is arranged corresponding to the nozzle 3 of the atomization device, and the tail is arranged corresponding to the end of the conveying pipeline 8.

Claims (5)

1.一种治理预焙阳极焙烧烟气的方法，其特征在于：来自培烧炉烟气从主管道进入脱硫除氟装置的顶部，在主管道的端部外设有雾化装置，氢氧化钠溶液自雾化装置的喷口喷出，氢氧化钠溶液与焙烧烟气在脱硫除氟装置中发生反应，对焙烧烟气进行脱硫除氟；所述喷口与主管道的圆形截面相切，脱硫除氟后的烟气通过输送管道进入到布袋除尘器中，布袋除尘器对烟气中的固体颗粒物进行脱除，烟气在经过脱硫除氟和颗粒物脱除之后通过引风机进入到烟囱后，排放到大气中；所述输送管道内壁设有加热棒，所述加热棒交叉设置在输送管道的内壁上。1. a method for treating pre-baked anode roasting flue gas is characterized in that: the top of the desulfurization and defluorination device from the incubator flue gas enters the desulfurization and defluorination device from the main pipeline, and the end of the main pipeline is provided with an atomizing device, and the hydrogen The sodium solution is sprayed from the nozzle of the atomization device, and the sodium hydroxide solution reacts with the roasting flue gas in the desulfurization and defluorination device, and the roasting flue gas is desulfurized and defluorinated; the nozzle is tangent to the circular section of the main pipeline, The flue gas after desulfurization and defluorination enters into the bag filter through the conveying pipeline, and the bag filter removes the solid particles in the flue gas. , and is discharged into the atmosphere; the inner wall of the conveying pipeline is provided with heating rods, and the heating rods are arranged crossly on the inner wall of the conveying pipeline. 2.一种实施权利要求1所述方法的治理预焙阳极烟气的装置，其特征在于：设有主管道，主管道的一端连接培烧炉烟气出口，另外一端连接于脱硫除氟装置的顶端，在主管道的端部外设有雾化装置，氢氧化钠溶液自雾化装置的喷口喷出，氢氧化钠溶液与焙烧烟气在脱硫除氟装置中发生反应，对焙烧烟气进行脱硫除氟；所述喷口与主管道的圆形截面相切，脱硫除氟装置的下方连接于输送管道的一端，所述输送管的另一端连接于布袋除尘器上，布袋除尘器的一侧连接于引风机的通风口，引风机的出风口连接于烟囱。2. a device implementing the method of claim 1 for treating pre-baked anode flue gas, characterized in that: be provided with a main pipe, one end of the main pipe is connected to the flue gas outlet of the incubator, and the other end is connected to the desulfurization and defluorination device There is an atomizing device outside the end of the main pipe, the sodium hydroxide solution is sprayed from the nozzle of the atomizing device, and the sodium hydroxide solution reacts with the roasting flue gas in the desulfurization and defluorination device. Desulfurization and defluorination are carried out; the nozzle is tangent to the circular section of the main pipeline, the lower part of the desulfurization and defluorination device is connected to one end of the conveying pipe, the other end of the conveying pipe is connected to the bag filter, and one end of the bag filter is connected. The side is connected to the ventilation opening of the induced draft fan, and the air outlet of the induced draft fan is connected to the chimney. 3.根据权利要求2所述的治理预焙阳极烟气的装置，其特征在于：所述喷口的数量为多个。3 . The device for treating prebaked anode flue gas according to claim 2 , wherein the number of the nozzles is multiple. 4 . 4.根据权利要求2所述的治理预焙阳极烟气的装置，其特征在于：脱硫除氟装置内壁设有螺旋状凹槽。4 . The device for treating prebaked anode flue gas according to claim 2 , wherein the inner wall of the desulfurization and defluorination device is provided with a spiral groove. 5 . 5.根据权利要求4所述的治理预焙阳极烟气的装置，其特征在于：所述螺旋状凹槽头部与雾化装置的喷口相应设置，尾部与输送管道的端部相应设置。5 . The device for treating prebaked anode flue gas according to claim 4 , wherein the head of the spiral groove is arranged corresponding to the nozzle of the atomizing device, and the tail is arranged corresponding to the end of the conveying pipe. 6 .
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CN112807999A (en) * 2021-01-13 2021-05-18 沈阳铝镁设计研究院有限公司 Low-temperature denitration system of aluminum oxide roasting furnace
CN113267049A (en) * 2021-06-02 2021-08-17 济宁碳素集团有限公司 Flue gas treatment method and device

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CN204656330U (en) * 2015-05-30 2015-09-23 四川省品信机械有限公司 A kind of desulfurizing tower
CN206746299U (en) * 2017-03-20 2017-12-15 南京碧林环保科技有限公司 Absorption tower for carbon baking furnace flue gas desulfurization
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