SOx AND NOx REDUCING METHOD OF SINTERING DISCHARGING GAS BY USING ANTHRACITE HAVING LOW NITROGEN AND

专利摘要:
PURPOSE: A method for reducing SOx and NOx of sintering discharging gas by using anthracite having low nitrogen and sulfur is provided. CONSTITUTION: In a conventional facilities where raw materials including iron ore, subsidiary raw materials, and returned sinter are blended in a first mixer with the addition of water and then granulated, the method is characterized in that a quantitative feeder is installed at the lower part of a raw material storage hopper(101, 102).
公开号:KR20020040506A
申请号:KR1020000070570
申请日:2000-11-24
公开日:2002-05-30
发明作者:한경수；이종남；조국진
申请人:이구택；주식회사 포스코；
IPC主号:

专利说明:

SOx AND NOx REDUCING METHOD OF SINTERING DISCHARGING GAS BY USING ANTHRACITE HAVING LOW NITROGEN AND SULFUR}
[11] The present invention sinters using low nitrogen and low sulfur-containing anthracite to minimize the amount of nitrogen oxides and sulfur oxides generated when sintered ore is produced by agglomerating powdered iron ore and various auxiliary materials and heat coke and anthracite. The present invention relates to a method for reducing sulfur oxides and nitrogen oxides in exhaust gas.
[12] As shown in FIGS. 1 and 2, the sintered ore is made of pulverized ore and secondary raw materials (limestone, silica sand, serpentine, etc.) cut out from the sintered soft and raw bins 101 and 102, and fuel coke and anthracite. After mixing and assembling by rotating and sprinkling with water from the tea mixers 104 and 105, charged into the trolley 107, and igniting the surface layer while passing through the ignition furnace 111 at 1200 ° C. Suction body with a strong bonding force between particles by injecting into the main brower 112 while the temperature is raised to 1300 ~ 1400 ℃ by the fuel contained in the blended raw material while the raw material is melted. Is formed).
[13] In the series of sintering processes described above, the reduction and oxidation of the blended raw materials and the solid fuel powdered coke in the sintering machine cart 107 occur almost instantaneously, and the powdered coke is blown in the process of blowing air in the sintering bed downward. By burning rapidly, the temperature is reached to 1350 ~ 1400 ℃.
[14] That is, carbon (87.1%) included in the powdered coke in the reaction process is combined with oxygen in the air sucked from the upper portion of the trolley 107 to become carbon monoxide, and the amount of heat required while reducing the blending material by the generated gas. The sintered compact is formed while transferring heat from the upper layer portion of the blended material to the lower layer portion.
[15] However, when only the buncoke, which is the fuel, is used as a sintered fuel, nitrogen and sulfur components contained in the bunk coke are combined with oxygen in the inhaled air, which causes a serious problem of releasing a large amount of toxic gases NOx and SOx. As a result, a mixture of low nitrogen anthracite coal having less harmful components is used.
[16] Therefore, the more the anthracite coal is used, the more harmful gases emitted in the sintering manufacturing process can be reduced. However, when a large amount of anthracite coal having a small amount of heat is produced in the sintering ore manufacturing process, the productivity and quality are reduced, and thus the current is within 40 to 60%. I use it.
[17] In addition, as shown in FIG. 3, the anthracite coal transported from the mountainous region is mixed with ingot so that it is cut out with the ingot coke in the primary storage bin 301 to be divided into granularity of 5 mm or less suitable for sintered ore production. Anthracite coal with a large distribution of fine particles of 5 mm or less is almost dead at the sorter 304 when flowing into the storage bins 102 and 110 of the blending process, and the bed is separated by the specific gravity of the coke and moisture calorific value. Mixing becomes uneven when used in the inside, and it causes operation fluctuations. In addition, the fuel coke and anthracite are simultaneously extruded to the upper portion of iron ore and secondary raw materials, and sprinkled with water from the primary mixer 104 to be cohesive with water. This strong anthracite coal is locally mixed with the iron ore and is not uniformly distributed in the effective image area (400㎡) of the sintering machine as shown in FIG. Due to the uneven distribution of the anthracite coal in a large amount of harmful gases generated at the time of completion, there is a problem in that the emissions during the continuous manufacturing process are high.
[18] Efforts have been made to solve these problems, but no practically beneficial measures have been proposed.
[19] The present invention was devised to solve the problems in view of the prior art as described above, in the first co-mixer and iron ore and secondary materials except anthracite in the coke and anthracite used as a heat source first mixed in the first mixer When reinforcing the granulator, low nitrogen anthracite-containing anthracite coal is used to reduce nitrogen oxides and sulfides by using low nitrogen anthracite coal to be uniformly coated on the sintered raw material by uniformly coating it on the sintered bed. It is an object of the present invention to provide a method for reducing sulfur oxides and nitrogen oxides in sintered exhaust gas.
[20] This object of the present invention is to add a fuel to the raw material for sintering when producing a sintered ore; Making a blended raw material by mixing powdered coke to have a water content of 6.0% ± 0.5 while sprinkling water on a primary mixer with iron ore and secondary raw materials such as limestone, silica, serpentine and quicklime; After said step is achieved by including the step of pseudo-granulation to uniformly blend the blended raw material with the anthracite coal is established in the secondary granulator.
[1] 1 is a process chart showing a conventional sintered ore manufacturing process,
[2] 2 (a) is a bed cross-sectional view showing a non-uniform assembly state of anthracite coal in the sintering raw material blending process,
[3] (B) is a perspective view showing an effective image area of sintered ore production,
[4] 3 is a process chart showing a process for sintering fuel coke and anthracite coals;
[5] 4 is an improved process chart showing a blending process of anthracite coal according to the present invention;
[6] Figure 5 is a graph showing the effect of reducing SOx emissions according to the anthracite substitution formulation of the present invention,
[7] Figure 6 is a graph showing the effect of reducing NOx emissions according to the anthracite substitution formulation of the present invention.
[8] Explanation of symbols on the main parts of the drawings
[9] 101a, 102a: quantitative extruder, 104: primary mixer,
[10] 105: secondary granulator, 107: sintering machine.
[21] Hereinafter, the present invention will be described in more detail with reference to the drawings.
[22] Referring to FIG. 4, in the present invention, iron ore, sub-materials, and sintered semi-reflectives are mixed with water in the first mixer 104, and then assembled in a secondary granulator 105 to manufacture pseudo particles in a conventional facility. When the amount of fuel to be added is determined by the amount of compound raw material determined according to the amount of production, the quantitative extruders 101a and 102a which can be cut according to a predetermined ratio targeted to the powdered coke and anthracite are provided under the raw material storage hoppers 101 and 102. This is done by installing on.
[23] The use ratio of the pulverized coke and anthracite which are cut out through the above-mentioned quantitative extruders 101a and 102a is determined by applying to the conventional use ratio by the substitution rate according to Equation 1 below.
[24] [Equation 1]
[25] Substitution rate = anthracite coal fixed carbon / powdered coke fixed carbon
[26] In addition, the process of separating and adding anthracite coal and powdered coke has higher cohesion of anthracite than powdered coke, so that the powdered coke is first charged into the sintering raw material and the primary mixer 104 and mixed while sprinkling with water necessary for the sintering process. When the raw material discharged from the process is loaded into the secondary granulator 105 by using a belt conveyor, the anthracite coal required for the amount of the blended raw material is evenly injected.
[27] At this time, the appropriate amount of water is preferably 6.0% ± 0.5.
[28] Therefore, anthracite coal is uniformly distributed in the raw material during granulation reinforcement in the secondary granulator 105, so that it is pseudo-grained to obtain a uniform distribution of anthracite coal without a separate device when charging in the sintering machine trolley.
[29] EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described.
[30] EXAMPLE
[31] The sintered raw material blending ratio used in this example is shown in Table 1 below, and the main raw materials were iron ore and secondary raw materials such as limestone, silica, serpentine, quicklime, and fuel buncoke and anthracite.
[32] Sintered Raw Material CompositionCompounding cost Blended raw materialsNew raw materialsironstone58 ± 1.0 Limestone12.2 ± 1.0 Serpentine1.3 ± 0.2 Quartz sand0 quicklime1.7 ± 0.2 system73.5 Semi-gloss23 ± 2.0 fuelBunk coke3.5 ± 0.2 hard coal Sum100
[33] Based on the raw material blending ratio of the sintered ore manufacture of Table 1, Table 2 below shows the results of industrial analysis and elemental analysis of powdered coke and anthracite.
[34] divisionIndustrial analysis (%)Elemental Analysis (%)Calorific Value (kcal / kg) AHSV.MF.CSN Anthracite A14.054.6381.320.210.376745 Anthracite B15.434.5680.010.190.426641 Bunk coke11.901.0087.100.561.176932
[35] Table 1 and Table 2 shows the results of the actual operation of measuring the harmful gases (SOx, Nox) discharged after the operation of the process and the conventional process of the present invention assembled by separating the anthracite coal under the raw material mixing conditions of Table 3 below. Shown in
[36] divisionConventionalThe present invention Sulfur oxide (ppm)140.7113.6 Nitrogen Oxide (ppm)131.382.2
[37] At this time, the sintering operation conditions were ignition furnace temperature is 1200 ℃, the negative air pressure was 185mb, the air blowing temperature is 150 ℃, after the bed was tested fairly by operating in BTP 7.5M at 620mm.
[38] From the above results, as shown in the industrial analysis and elemental analysis results of the two types of low nitrogen and low sulfur anthracite coal (anthracite coal and anthracite coal B) of Table 2, anthracite coal is separated and assembled into a raw material containing iron ore and powdered coke. In this case, it was found that anthracite coal was uniformly coated on the surface of the blended raw material and uniformly diffused and blended into the charging layer in the sintered bed, thereby significantly reducing SOx and NOx discharged from the sintering process.
[39] And, as shown in Table 2, the amount of fixed carbon as the main heat source contains more than the anthracite coal having a coke of 87 (wt,%), which is 80 to 81 (wt,%), but the total calorific value (by fixed carbon) In terms of calorific value + calorific value), the two fuels are of similar level, and the performance substitution rate in the sintering operation by fixed carbon is 0.93% and 0.92%, respectively, as shown in the following example by Equation 1, thereby replacing the coking coal with anthracite. Preferred proper substitution rate of was obtained.
[40] [Yes]
[41] Anthracite A = 81.32 / 87.10 = 0.93;
[42] Anthracite B = 80.01 / 87.10 = 0.92
[43] In addition, the significant reduction in the amount of sulfur oxides and nitrogen oxides reduced by the present invention as shown in Figs.
[44] As described above, the present invention greatly reduces the amount of SOx and NOx, which are environmental pollutants, without affecting the sintering productivity and quality without additional investment in the uniform coating of anthracite coal in the raw material for sintered ore production. Is a very useful invention.

权利要求:
Claims (3)
[1" claim-type="Currently amended] When fuel is added to a raw material for sintering to produce a sintered ore;
Making a blended raw material by mixing powdered coke to have a water content of 6.0% ± 0.5 while sprinkling water on a primary mixer with iron ore and secondary raw materials such as limestone, silica, serpentine and quicklime;
After the step of pseudo-integrating the blended raw material so as to uniformly blend with the anthracite coal having a grain size in the secondary granulator of sulfur oxides and nitrogen oxides of the sintered exhaust gas using low nitrogen low sulfur anthracite coal Reduction Method.
[2" claim-type="Currently amended] The method for reducing sulfur oxides and nitrogen oxides of sintered exhaust gas using low-nitrogen low sulfur-containing anthracite according to claim 1, wherein the anthracite coal is replaced with coke in the pseudo-granulation step.
[3" claim-type="Currently amended] The method for reducing sulfur oxides and nitrogen oxides of sintered exhaust gas using low nitrogen and low sulfur-containing anthracite according to claim 2, wherein the substitution ratio is a value obtained by dividing the fixed carbon amount of anthracite coal by the fixed coke fixed carbon amount.

类似技术:

---

公开号 | 公开日 | 专利标题

---

US6605130B2|2003-08-12|Pellets incorporated with carbonaceous material

---

KR100584745B1|2006-05-30|An apparatus and method for recycling dust and sludge containing iron ironmaking process using coal and fine ore

---

KR100710943B1|2007-04-24|Process for producing particulate iron metal

---

KR100457896B1|2004-11-18|Method for producing reduced iron

---

AU714097B2|1999-12-16|Method of producing reduced iron pellets

---

EP1713940B1|2010-12-15|Method for manufacturing molten irons

---

EP1096215A2|2001-05-02|Apparatus and method for producing metal through reduction

---

EP1027461B1|2002-05-08|Method and apparatus for making metallic iron

---

CN101532084B|2011-06-29|Method for charging iron ore sintering fuel

---

KR101304686B1|2013-09-06|Part reduced iron for blast furnace and method thereof

---

EP1808498A1|2007-07-18|Process for producing molten iron and apparatus therefor

---

KR101284532B1|2013-07-16|Production of sintered ore

---

JP4807103B2|2011-11-02|Blast furnace operation method

---

CN1043734A|1990-07-11|Reduce the technology of content of sulfur dioxide in the boiler smoke

---

RU2455370C1|2012-07-10|Agglomerate containing titanium oxide for production of granulated metallic iron

---

ES2523700T3|2014-11-28|Briquetted iron by hot molding and process to produce it

---

JP5699567B2|2015-04-15|Method for producing sintered ore

---

KR20020083638A|2002-11-04|Recycling method of waste material by using of coal based iron making process

---

KR101475130B1|2014-12-22|Method for producing sintered ore

---

JP5547879B2|2014-07-16|Carbonaceous material-incorporated iron oxide agglomerate, method for producing the same, and method for producing reduced iron or metallic iron

---

CA2096579C|1998-01-27|Method of producing molten pig iron or molten steel pre-products and a plant therefor

---

JP4490640B2|2010-06-30|Method for producing reduced metal

---

JP3755452B2|2006-03-15|Method for manufacturing raw materials for sintering

---

CN1074047C|2001-10-31|Method for using coal fines in a melt-down gasifier

---

JP4470490B2|2010-06-02|Method for producing semi-reduced agglomerate

同族专利:

---

公开号 | 公开日

---

KR100469298B1|2005-01-31|

引用文献:

---

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

---

法律状态:
2000-11-24|Application filed by 이구택, 주식회사 포스코

---

2000-11-24|Priority to KR20000070570A

---

2002-05-30|Publication of KR20020040506A

---

2005-01-31|Application granted

---

2005-01-31|Publication of KR100469298B1

优先权:

---

申请号 | 申请日 | 专利标题

---

KR20000070570A|KR100469298B1|2000-11-24|2000-11-24|SOx AND NOx REDUCING METHOD OF SINTERING DISCHARGING GAS BY USING ANTHRACITE HAVING LOW NITROGEN AND SULFUR|