CN112833677A - Carbon anode roasting pre-purification process based on flue gas circulation - Google Patents

Carbon anode roasting pre-purification process based on flue gas circulation Download PDF

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Publication number
CN112833677A
CN112833677A CN202011571382.5A CN202011571382A CN112833677A CN 112833677 A CN112833677 A CN 112833677A CN 202011571382 A CN202011571382 A CN 202011571382A CN 112833677 A CN112833677 A CN 112833677A
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China
Prior art keywords
flue gas
roasting
carbon anode
process based
flue
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Pending
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CN202011571382.5A
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Chinese (zh)
Inventor
瞿赞
范兰
黄文君
丰来国
徐浩淼
晏乃强
高冠群
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Shanghai Jiaotong University
Yancheng Lanfeng Environmental Engineering Technology Co Ltd
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Shanghai Jiaotong University
Yancheng Lanfeng Environmental Engineering Technology Co Ltd
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Priority to CN202011571382.5A priority Critical patent/CN112833677A/en
Publication of CN112833677A publication Critical patent/CN112833677A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0031—Regulation through control of the flow of the exhaust gases

Abstract

The invention relates to a carbon anode roasting pre-purification process based on flue gas circulation. Compared with the prior art, the invention can obviously reduce the subsequent smoke treatment capacity; the heat of the circulating flue gas of the roasting furnace is recovered, and the fuel consumption is reduced; the high temperature of the flame path of the roasting furnace is utilized to realize the deep removal of the circulating flue gas organic pollutants; has the advantages of simple process and low cost.

Description

Carbon anode roasting pre-purification process based on flue gas circulation
Technical Field
The invention belongs to a flue gas purification technology in the field of environmental protection, and particularly relates to a carbon anode roasting flue gas circulating purification process.
Background
The raw aluminum yield of China is continuously first in the world for more than ten years, the carbon anode yield for providing the anode for electrolytic aluminum is very high, and the flue gas of the roasting furnace is one of the main sources of the emission of atmospheric pollutants in the carbon industry and mainly contains particles and SO2The environmental protection department has issued a modification list of aluminum industry pollutant emission standard Standard (GB 25465-. Thus, under the stringent requirements of the new standards, many carbon enterprises are at risk of centralized remediation or even overall shutdown.
At present, particulate matters, sulfur oxides and nitrogen oxides are removed by adopting an electric capture method, wet desulphurization, SCR and other denitration processes in the carbon industry for most of roasting flue gas, the attention on the treatment of the asphalt smoke and the organic pollutants is insufficient, and a new treatment unit is required to be added if the control on the asphalt smoke and the organic pollutants needs to be strengthened. Meanwhile, the roasting flue gas amount is large, the outlet temperature is high, and the subsequent flue gas purification equipment can be utilized for treatment only by cooling at first, so that the heat loss is caused. Therefore, the development of an energy-saving low-cost roasting flue gas purification process is of great significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a carbon anode roasting pre-purification process based on flue gas circulation, which can deeply remove organic pollutants, realize heat recovery, reduce fuel consumption and reduce roasting flue gas treatment capacity.
The purpose of the invention can be realized by the following technical scheme: a carbon anode roasting pre-purification process based on flue gas circulation is characterized in that a part of high-temperature flue gas is extracted from a main flue between a roasting furnace and a flue gas purification device and is used as circulating flue gas, introduced into a combustion-supporting air pipeline of the roasting furnace to be mixed, and then introduced into a fire path of the roasting furnace to pre-purify roasting flue gas.
Furthermore, the flue gas discharged from the roasting furnace passes through a cyclone dust collector, a quantitative adsorption material is added into the flue gas, and the flue gas is circulated after part of dust is removed in advance.
Furthermore, the adsorbing material is waste powder such as petroleum coke, calcined coke, carbon anode and the like, the particle size of the adsorbing material is 100-300 meshes, and the adding amount of the adsorbing agent in each cubic smoke is 100-300 mg.
Further, a draught fan is adopted to pump out 10-40% of roasting smoke gas by volume percentage from the main flue for circulation.
Furthermore, the induced draft fan is a high temperature resistant and corrosion resistant fan, and the high temperature flue gas is led out and conveyed to a combustion air pipeline.
Furthermore, a circulating flue gas leading-out pipeline is arranged on the main flue, and the included angle between the circulating flue gas leading-out pipeline and the main flue is 20-80 degrees.
Furthermore, the circulating flue gas extracted from the main flue is monitored by an online instrument, passes through the flow control device and is introduced into a combustion air pipeline of the roasting furnace.
Further, the online instrument monitors the content and the temperature of oxygen in the flue gas;
furthermore, the flow control device is a high-temperature-resistant and corrosion-resistant valve.
Further, an oxygen supplementing system is adopted to supplement pure oxygen with the volume of 1-10% of the circulating flue gas so as to ensure that the oxygen content of the circulating flue gas can meet the requirement of the sufficient combustion of the circulating flue gas and combustion-supporting air.
Further, the temperature of the flue gas extracted from the main flue is within the range of 300-650 ℃.
Furthermore, the flue gas purification device is a conventional roasting flue gas purification device and is used for carrying out deep purification treatment on pollutants.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the cyclone dust collector is arranged at the outlet of the roasting furnace to pre-remove dust in the flue gas, then the flue gas is connected with the conventional roasting flue gas purification device through the main flue, meanwhile, part of the flue gas is extracted before the flue gas enters the conventional roasting flue gas purification device and circularly returns to the roasting furnace, and the flue gas amount to be subsequently purified can be obviously reduced through flue gas circulation;
2. by recycling the flue gas of the high-temperature roasting furnace, the heat of the recycled flue gas can be recovered and used for preheating the combustion-supporting flue gas and reducing the fuel consumption;
3. the high temperature of the flame path of the roasting furnace is utilized to realize the deep removal of the circulating smoke organic pollutants, and particularly, the asphalt smoke and the organic pollutants can be effectively removed by returning the circulating smoke to the roasting furnace;
4. has the advantages of simple process and low cost.
5. The existing mainstream process for purifying the carbon anode roasting smoke is to remove dust and asphalt smoke by electric coking and then desulfurize by wet washing equipment, and the smoke treatment is not carried out by adopting smoke circulation. The main reason for this is probably that the smoke contains a large amount of sticky pollutants such as asphalt smoke and tar, which are easily accumulated in the pipeline, and the pipeline is corroded and blocked, resulting in difficulty in maintenance. Therefore, the invention is provided with a cyclone dust removal system, and the asphalt smoke and tar are primarily removed by utilizing the process waste material powder of the carbon factory, such as petroleum coke, calcined coke, carbon anode and the like, so that the smoke is cleaner, and the adverse effect on the pipeline can be reduced when the smoke is circularly treated. In addition, aiming at the problem that the oxygen content of the circulating flue gas is possibly insufficient, an oxygen content monitoring system and a pure oxygen supplementing system are specially arranged, so that the full combustion of the flue fuel of the roasting furnace can be guaranteed, and the original carbon roasting process parameters cannot be adversely affected.
Drawings
FIG. 1 is a schematic structural diagram of a flue gas dry desulfurization process of the present invention;
fig. 2 is a schematic structural diagram of the positions of the flue gas circulation flue and the main flue.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention is described in detail below with reference to specific figures and examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in figure 1, a carbon anode roasting flue gas pre-purification process based on flue gas circulation is characterized in that fuel 101 and combustion-supporting air 102 are input into a roasting furnace 1, carbon anode roasting is carried out in the roasting furnace 1, generated flue gas firstly removes part of dust in advance through a cyclone dust collector 2, then enters a conventional roasting flue gas purification device 8 (which can be any one of the existing flue gas purification processes such as electric coke catching, denitration or desulfurization processes) through a main flue 3, a circulation flue gas leading-out pipeline 4 is arranged on the main flue 3, an included angle between the circulation flue gas leading-out pipeline 4 and the main flue 3 is 20-80 degrees (as shown in figure 2), the circulation flue gas leading-out pipeline 4 is connected to a combustion-supporting air pipeline in front of the roasting furnace through a circulation pipeline, a flue gas flow regulating valve 6 and an induced draft fan 5 are further arranged on the circulation pipeline, and a part of high-temperature flue gas is extracted from the main flue 3, monitoring the oxygen content in the circulating flue gas through an online instrument, if the oxygen is insufficient, supplementing pure oxygen with the volume of 1-10% into the circulating flue gas through an oxygen supplementing system 7 to ensure that the oxygen content can meet the requirement of sufficient combustion of the circulating flue gas and combustion-supporting air, adjusting the flow of the circulating flue gas through a flue gas flow regulating valve 6, introducing the circulating flue gas into a combustion-supporting air pipeline of a roasting furnace, mixing the circulating flue gas with the combustion-supporting air 102, heating the combustion-supporting air by using the heat of the circulating flue gas to reduce the fuel consumption, introducing the circulating flue gas into a flame path of the roasting furnace 1, and deeply combusting and purifying volatile organic pollutants in the circulating flue gas by using the high temperature in.
According to the roasting flue gas amount of 200000Nm3The system of/h is illustrated by way of example, with flue gasThe oxygen content in (c) was calculated as 15%. After the roasting flue gas passes through the cyclone dust collector, a part of high-temperature roasting flue gas is directly extracted from the flue through the induced draft fan and is supplemented to the inlet of the flame path, and the roasting flue gas is mixed with combustion air and fuel in the flame path and then roasted.
Example 1:
1. adding petroleum coke powder with the particle size of 100-300 meshes as an adsorbent into a cyclone dust collector, wherein the addition amount of the adsorbent in each cubic smoke is 200mg, firstly performing pre-dedusting treatment on the high-temperature roasting smoke by using the cyclone dust collector to remove most of dust in the smoke, and maintaining the pre-treated roasting smoke at 650 ℃ so as to be convenient for subsequent waste heat recovery;
2. leading out about 10 percent (about 20000Nm3/h) of high-temperature circulating flue gas from an outlet pipeline of the cyclone dust collector by using a draught fan;
3. 1200Nm3Pure O at a pressure of 0.6 MPa/h2As supplementary oxygen, introducing into the circulating flue and mixing with the circulating flue gas;
4. and spraying the circulating flue gas with the adjusted oxygen content into a flame path of the roasting furnace through a plurality of nozzles to mix with combustion air and fuel and then burn.
5. Passing laboratory 200m3The experiment of the simulated roasting and flue gas purification system in the/h scale shows that after the process of the embodiment 1, the content of the asphalt tar is reduced by about 8 percent, and the fuel consumption is reduced by 6 percent.
Example 2:
1. adding carbon anode waste powder with the particle size of 100-300 meshes into a cyclone dust collector as an adsorbent, wherein the addition amount of the adsorbent in each cubic smoke is 100mg, firstly carrying out pre-dedusting treatment on high-temperature roasting smoke by using the cyclone dust collector to remove most of dust in the smoke, and maintaining the pre-treated roasting smoke at 650 ℃ so as to be convenient for subsequent waste heat recovery;
2. leading out about 20 percent (about 20000Nm3/h) of high-temperature circulating flue gas from an outlet pipeline of the cyclone dust collector by using a draught fan;
3. 2400Nm3Pure O at a pressure of 0.6 MPa/h2As supplementary oxygen, introducing into the circulating flue and mixing with the circulating flue gas;
4. and spraying the circulating flue gas with the adjusted oxygen content into a flame path of the roasting furnace through a plurality of nozzles to mix with combustion air and fuel and then burn.
5. Passing laboratory 200m3The experiment of the simulated roasting and flue gas purification system in the/h scale shows that after the process of the embodiment 1, the content of the asphalt tar is reduced by about 15 percent, and the fuel consumption is reduced by 11 percent.
Example 3:
1. adding calcined coke powder with the particle size of 100-300 meshes into a cyclone dust collector as an adsorbent, wherein the addition amount of the adsorbent in each cubic flue gas is 300mg, firstly carrying out pre-dedusting treatment on high-temperature roasting flue gas by using the cyclone dust collector to remove most of dust in the flue gas, and maintaining the pre-treated roasting flue gas at 650 ℃ so as to carry out waste heat recovery in the subsequent process;
2. a draught fan is utilized to lead out about 30 percent (about 20000Nm3/h) of high-temperature circulating flue gas from an outlet pipeline of the cyclone dust collector;
3. 3600Nm3Pure O at a pressure of 0.6 MPa/h2As supplementary oxygen, introducing into the circulating flue and mixing with the circulating flue gas;
4. and spraying the circulating flue gas with the adjusted oxygen content into a flame path of the roasting furnace through a plurality of nozzles to mix with combustion air and fuel and then burn.
5. Passing laboratory 200m3The experiment of the simulated roasting and flue gas purification system in a/h scale shows that after the process of the embodiment 1, the content of the asphalt tar is reduced by about 22 percent, and the fuel consumption is reduced by 16 percent.

Claims (10)

1. A carbon anode roasting pre-purification process based on flue gas circulation is characterized in that part of high-temperature flue gas is extracted from a main flue between a roasting furnace and a flue gas purification device and is used as circulating flue gas, introduced into a roasting furnace combustion air pipeline for mixing, and then introduced into a roasting furnace flue for pre-purifying roasting flue gas.
2. A carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 1, wherein the flue gas discharged from the roasting furnace is firstly passed through a cyclone, and is subjected to flue gas circulation after a certain amount of adsorbing material is added into the cyclone and part of dust is removed in advance.
3. The carbon anode roasting pre-purification process based on flue gas circulation as claimed in claim 2, wherein the adsorbing material is waste powder of petroleum coke, calcined coke, carbon anode, etc., the particle size is 100-300 mesh, and the adding amount of the adsorbent per cubic flue gas is 100-300 mg.
4. The carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 1, is characterized in that a draught fan is adopted to extract roasting flue gas with the volume percentage of 10-40% from a main flue for circulation.
5. The carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 4, wherein the induced draft fan is a high temperature resistant and corrosion resistant fan, and is used for leading out high temperature flue gas and conveying the high temperature flue gas to a combustion air pipeline.
6. The carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 1, wherein a circulating flue gas leading-out pipeline is arranged on the main flue, and the included angle between the circulating flue gas leading-out pipeline and the main flue is 20-80 degrees.
7. The carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 1, wherein the circulating flue gas extracted from the main flue is monitored by an on-line instrument, passes through a flow control device and is introduced into a roasting furnace combustion air pipeline.
8. The carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 5, wherein the on-line instrument monitors the oxygen content and temperature in the flue gas; the flow control device is a high-temperature-resistant and corrosion-resistant valve.
9. The carbon anode roasting prepurification process based on flue gas circulation as claimed in claim 1, wherein an oxygen supplementing system is adopted to ensure that the oxygen content can meet the requirement of sufficient combustion of the circulating flue gas and combustion-supporting air by supplementing pure oxygen with 1-10% of the volume of the circulating flue gas.
10. The carbon anode roasting pre-purification process based on flue gas circulation as claimed in claim 1, wherein the temperature of the flue gas extracted from the main flue is within the range of 300-650 ℃;
the flue gas purification device is a conventional roasting flue gas purification device and is used for carrying out deep purification treatment on pollutants.
CN202011571382.5A 2020-12-27 2020-12-27 Carbon anode roasting pre-purification process based on flue gas circulation Pending CN112833677A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004210904A (en) * 2002-12-27 2004-07-29 Ngk Insulators Ltd Gasification system of biomass
CN101306312A (en) * 2008-06-24 2008-11-19 中国铝业股份有限公司 Flue gas cleaning treatment method during producing carbon product
CN201772442U (en) * 2010-08-12 2011-03-23 王石柱 Oxygen supplementation type fume gas circulation combustion device
CN105295962A (en) * 2014-07-28 2016-02-03 宝山钢铁股份有限公司 Method and device for reducing emission of NOx in waste flue gas of coke oven
CN106439796A (en) * 2016-11-09 2017-02-22 中国环境科学研究院 Flue gas volume/nitric oxide emission reduction system of low-load coal-fired boiler
CN111545003A (en) * 2020-05-20 2020-08-18 山东大学 Method for purifying tar in carbon electrode roasting furnace flue gas

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004210904A (en) * 2002-12-27 2004-07-29 Ngk Insulators Ltd Gasification system of biomass
CN101306312A (en) * 2008-06-24 2008-11-19 中国铝业股份有限公司 Flue gas cleaning treatment method during producing carbon product
CN201772442U (en) * 2010-08-12 2011-03-23 王石柱 Oxygen supplementation type fume gas circulation combustion device
CN105295962A (en) * 2014-07-28 2016-02-03 宝山钢铁股份有限公司 Method and device for reducing emission of NOx in waste flue gas of coke oven
CN106439796A (en) * 2016-11-09 2017-02-22 中国环境科学研究院 Flue gas volume/nitric oxide emission reduction system of low-load coal-fired boiler
CN111545003A (en) * 2020-05-20 2020-08-18 山东大学 Method for purifying tar in carbon electrode roasting furnace flue gas

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