• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PURPOSE: Prepared are fuels for clinker fabrication using wastewater sludge and waste oil, and manufacturing system and method thereof. CONSTITUTION: The manufacturing system of fuels for clinker fabrication comprises a heating furnace(3) for drying dewatered sewage sludge to a moisture content less than 25%; a mixer(4) which is equipped with a sprayer for spraying waste oil to dried sewage sludge at the upper side thereof. The heating furnace has lower internal pressure than atmospheric pressure as well as restricts direct contact between sewage sludge and heat sources so that sewage sludge is able to avoid oxidation reaction.
    公开号:KR20020024642A
    申请号:KR1020000056404
    申请日:2000-09-26
    公开日:2002-04-01
    发明作者:임하진
    申请人:임하진；(주)티에이엔；
    IPC主号:
    专利说明:

    Fuel for sintering cement clinker using sewage sludge and its manufacturing apparatus and manufacturing method {Fuels for clinker fabrication using waste-water sludges, and manufacturing system and method
    [4] The present invention relates to sewage sludge, and more particularly, to a method for treating sewage sludge.
    [5] Sewage sludge is a substance having a very high viscosity generated in the process of purifying sewage and wastewater generated in daily life, and containing organic and inorganic substances with a large amount of water. Generally, sewage sludge treatment plants make sewage sludge, which is a by-product sedimented by treating sewage and wastewater, by landfilling or dumping the cake-type sludge by mechanical methods, concentration, or dehydration by heat.
    [6] However, such landfills or dumping at sea caused problems such as lack of landfills, pollution of soil or marine environment, and other methods for dealing with them have been sought. As one of these methods, a method of incineration of sewage sludge has been considered, but the method requires excessive cost due to the equipment and fuel required for incineration, and not only causes a problem of air pollution due to dioxin generated during combustion. This causes problems such as the need to reprocess the ash which is a combustion residue.
    [7] Therefore, in order to treat sewage sludge as described above, not only the environmental problems accompanying the treatment process but also the cost of treatment should be considered. There is also a need for a method of discipline that does not create another problem with the byproducts of the treatment. The present invention relates to a treatment method for such sewage sludge. Sewage sludge contains not only a large amount of organic matter, but also inorganic materials such as SiO 2 , CaO, Al 2 O 3 and Fe 2 O 3 , so that the organic matter contained in the sewage sludge can provide a high calorific value of about 1,500 to 3,500 kcal during combustion. In addition, it is necessary to develop a method for reuse as a cement clinker calcined fuel by using the components of the sludge since the inorganic materials remain without being destroyed by combustion.
    [8] The technical problem to be achieved by the present invention, as described above, relates to a manufacturing apparatus and a manufacturing method for treating the sewage sludge for use as a fuel for cement firing, and a fuel for cement firing as a result.
    [1] FIG. 1 schematically shows a system for treating sewage sludge and a process for treating sewage sludge in order to produce a fuel for cement firing of the present invention.
    [2] 2 (a) and (b) shows a schematic perspective view and a cross-sectional view of the structure of the heating furnace of the indirect heating method according to an embodiment of the present invention.
    [3] 3 is a cross-sectional view showing the structure of a mixer according to an embodiment of the present invention.
    [9] Cement clinker firing fuel production system of the present invention for achieving the above technical problem, a waste oil injector for injecting waste oil into the heating furnace for drying the dewatered sewage sludge and the sewage sludge dried through the heating furnace on the top. It contains a mixer for mixing the dry sewage sludge and waste oil.
    [10] In the fuel production method for cement clinker firing of the present invention for achieving the above technical problem, the step of producing a dry sewage sludge having a water content of 25% or less by weight ratio by heating the dehydrated sewage sludge in a heating furnace and the drying; Mixing sewage sludge with waste oil.
    [11] Cement clinker firing fuel of the present invention for achieving the above technical problem, the sewage sludge having a water content of 25% or more by weight, the solid content of the main component is silicon, aluminum and iron oxides corresponding to the components of the cement clinker and the In order to increase the calorific value of the sewage sludge, the composition includes waste oil uniformly mixed in the sewage sludge.
    [12] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
    [13] FIG. 1 schematically shows a system for treating sewage sludge and a process for treating sewage sludge in order to produce a fuel for cement firing of the present invention. Arrows shown as continuous lines in FIG. 1 indicate the inflow path of sewage sludge, and arrows shown as dashed lines indicate outflow paths of gas, particles, and the like.
    [14] Sewage sludge dehydrated in sewage treatment plant and supplied in the form of cake has a water content of 70 ~ 90%. Therefore, in order to use the sewage sludge as a fuel, water contained in the sewage sludge should be removed.
    [15] Referring to FIG. 1, sewage sludge introduced into the heating furnace 3 for drying may be periodically or continuously introduced from the storage silo 1 by a predetermined amount. A conveyor belt (not shown) may be installed between the outlet of the storage silo 1 and the inlet of the heating furnace 3 to automatically carry out the transfer of sewage sludge. In addition, as shown in Figure 1, the penis (2) for making a massive sewage sludge having a constant size and shape for easy handling may be placed.
    [16] Sewage sludge, which is provided in the form of cake, is very easy to be formed because it contains a polymer material as a coagulant added in the treatment process at the sewage treatment plant and can be molded by hand tools such as centrifugal force forming device, blade or roller press. Can be. Here, in the case where the viscosity of sewage sludge is not suitable for forming a globule, it is preferable to use a compression molding method using a roller press.
    [17] Referring to FIG. 1, the sewage sludge introduced into the heating furnace 3 is heated at a constant temperature to evaporate moisture contained therein. At this time, the temperature of the sewage sludge should not exceed 250 ℃, it is preferably maintained at a temperature of 100 ~ 210 ℃. The drying time of the sewage sludge for sufficient drying depends on the drying temperature, but it is preferably maintained for 20 to 60 minutes. In addition, when the heat source (not shown) of the furnace and the sewage sludge are in direct contact, it is preferable to keep the oxygen concentration low in the furnace 3 to prevent oxidation of the sewage sludge. Therefore, the above object can be achieved by appropriately pumping the air inside by the outside pump 6. Meanwhile, an indirect heating furnace may be used to prevent oxidation of the sewage sludge. As an example, a schematic perspective view and a cross-sectional view of an indirect heating furnace 200 are illustrated in FIGS. 2A and 2B, respectively. Referring to FIG. 2, the heat source is supplied through one or a plurality of pipes 210 penetrating the inside of the heating furnace 200 to block the contact between the sewage sludge and the heat source. Therefore, the heat required for drying is only indirectly transferred to the sewage sludge through the pipe and direct contact is blocked.
    [18] On the other hand, the furnace 3 may be a rotary kiln mainly used for manufacturing cement. In the operation of a conventional rotary kiln, the inflow side is inclined at a predetermined angle higher than the outflow side, so that the inflow moves to the outflow side as the chamber rotates, and the heat source is located at the outflow side. Therefore, the sewage sludge can be continuously supplied without a separate device for the flow of sewage sludge in the kiln, which is very effective in the practice of the present invention. In the rotary kiln, a heat source is supplied by directly injecting a flame into the kiln chamber and by introducing hot air heated by a boiler (not shown) into the chamber without directly injecting a flame. In the case of direct injection, as described above, it is preferable to prevent contact with sewage sludge through a separate pipe for inflow of a heat source, and in the case of inflow of hot air, the pressure in the chamber is kept lower than that of the air without a separate pipe. The oxidation of sewage sludge can be prevented. The chamber pressure of the rotary kiln can be maintained by pumping by a pump 6 connected to the inlet side of sewage sludge, for example an IDD (Induced Draft Fan) as shown in FIG. 1. A filter 5, for example, a bag filter, may be further installed to remove dust and odor contained in the air flowing into the IDF.
    [19] The sewage sludge passed through the furnace 3 is fed into the mixer 4 for mixing with the waste oil. The mixer 4 is provided with a plurality of injectors (not shown) disposed at regular intervals thereon. Waste oil injected through the injector is adsorbed on the surface of the introduced sewage sludge. It should be noted here that the sewage sludge flowing into the mixer 4 is still at a high temperature, so the pressure inside the mixer should be kept low, such as in a furnace, to prevent oxidation of the sewage sludge. Thus, pumping by a pump is necessary, such as in a furnace, to maintain a constant low pressure. This can be done without a separate pump, as shown in FIG. 1, by branching off the piping to the pump 6 used in the furnace and connecting it into the mixer.
    [20] In order to maintain a constant pressure in the mixer, a double-deck structure may be installed in the mixer (300 in FIG. 3). This is illustrated in FIG. 3, that is, the sewage sludge from the heating furnace passes sequentially from the first deck 310 to the second deck 320, and when the sewage sludge is introduced, each deck is inlet 311 and 312. Opening and closing operation can prevent the inflow of outside air. Therefore, the waste oil injected by the waste oil injector 330 installed on the upper part of the second deck 320 is quickly adsorbed by the heat of sewage sludge, and also allows the additional drying effect of the sewage sludge by the heat with mixing. do.
    [21] Waste oil injected in the mixing process may be used waste lubricants, waste oils and the like. The waste oil has a calorific value of about 10,000 kcal / kg or more, and thus, when combined with sewage sludge having a calorific value of about 1,500 to 3,500 kcal / kg in a suitable ratio, it has a calorific value of about 6,000 to 7,000 kcal / kg, which is equivalent to bituminous coal. It can be manufactured from solid fuel.
    [22] Sewage sludge and waste oil used in the present invention are both environmental pollutants and materials that are difficult to dispose of. The present invention makes it possible to utilize the wastes without producing any secondary pollution by preparing solid fuels from these materials and injecting them as fuel in the cement clinker firing process. That is, as described above, sewage sludge contains not only organic matter but also inorganic materials such as SiO 2 , CaO, Al 2 O 3 and Fe 2 O 3 , which are similar to the components of clay used as an auxiliary material of cement. Therefore, by mixing the sewage sludge and the waste oil to use as a fuel for cement clinker firing, it is possible to perform a function as a fuel and a cement raw material after combustion to perform a function as an auxiliary raw material.
    [23] Table 1 shows the composition of the sewage sludge used in the embodiment of the present invention, the composition of the sewage sludge, the composition of the clay which is usually used as a raw material of cement, and the respective loss of ignition.
    [24] divisionSiO 2 Al 2 O 3 Fe 2 O 3 CaOMgOK2ONa 2 OSO 3 P 2 O 5 ClIgnition loss clay64.818.15.62.51.22.31.2---5.3 Sewage Sludge15-306-152 ~ 52 ~ 51 to 20.5 to 1.50.5 to 1.51-41.5-70.2 to 0.440-60
    [25] Loss on ignition represents the percentage of weight loss at a given temperature and at a certain time. In Table 1, the loss on ignition of clay is based on the maintenance of more than 1 hour at 900 ℃, the loss on ignition of sewage sludge is measured on the basis of maintaining more than 1 hour at a temperature of 110 ℃. As shown in Table 1, sewage sludge has a very high loss of solids of 40 to 60%, because sewage sludge contains a considerable amount of organic matter, and this organic matter acts as a reason for showing high calorific value of sewage sludge. On the other hand, sewage sludge has a high content of Al 2 O 3 and Fe 2 O 3 it can be seen that it has a suitable composition as a clay and iron auxiliary raw material.
    [26] Hereinafter, an experimental example of manufacturing cement through a cement clinker firing fuel by mixing sewage sludge and waste oil of the present invention will be described.
    [27] The raw material of this experiment example was manufactured by the method demonstrated with respect to FIG. That is, the dewatered sewage sludge is metered from the storage silo and supplied to the penis through a conveyor, etc., and the sewage sludge formed at a rate of 10 to 30 tons per hour is fed to the rotary kiln. After drying by hot air supplied by the combustion of the rotary kiln boiler, it is supplied to the mixing chamber. The sewage sludge introduced into the mixing chamber was mixed with the waste oil under a pressure of about 0.5 atm to produce a complete cement clinker auxiliary fuel.
    [28] The solidified fuel thus prepared had a water content of about 25% by weight or less, a waste oil content of 15 to 35% by weight, and a calorific value of about 6,000 to 6,500 kal / kg.
    [29] The solidified fuel prepared as described above was mixed with bituminous coal at a constant ratio, and was added to the cement kiln for cement firing as a secondary fuel of cement clinker to prepare a clinker. The solidified fuel was mixed so as to be 10%, 20%, and 30% with respect to bituminous coal, respectively, based on calories. The quality of the clinker prepared as described above and the 28-day strength of the clinker are shown in Table 2. In addition, Table 2 also shows a case where only the coal is used as auxiliary fuel without mixing the solidified fuel of the present invention for comparison.
    [30] divisionFuel Consumption (kg / l-Clinker)Clinker quality Bituminous coalSolid FuelModulus (LSF)Unreacted calcium oxide (%)Cl (ppm)28 days strength (kg / cm 2 ) Sludge 10%99.013.394.71.161387 Sludge 20%88.026.794.51.066393 Sludge 30%77.039.994.20.971388 Comparative example110.0-94.81.156380
    [31] Here, the specific lime saturation factor (LSF), the modulus characterizing the chemical composition and mineral composition of the clinker, and the amount of unreacted calcium oxide (free lime) indicating the degree of plasticity of the cement clinker and the chlorine (Cl) content as impurities Meaning is well known to those of ordinary skill in the art, so description thereof is omitted. As can be seen in Table 2, it can be seen that the lime saturation and the content of unreacted calcium oxide in the case where sludge replaces bituminous coal at a constant ratio are not significantly different from those in case of using only bituminous coal. In addition, it can be seen that the mortar 28-day compressive strength of the clinker, which is a measure of cement strength expression, does not significantly differ from the comparative example, but rather increases slightly. Therefore, it can be seen that the auxiliary fuel mixed with the sewage sludge and the waste oil of the present invention does not cause deterioration of the quality of the cement clinker even if it is included as an auxiliary material of the clinker during firing of the cement clinker after combustion.
    [32] In the above experimental example, the raw material of the present invention added as a fuel of cement clinker is a cement kiln is operated at a high temperature of more than 1,450 ℃, the combustion of harmful substances such as dioxins are completely decomposed to cause problems of air pollution when incineration of sewage sludge. There is no room for it.
    [33] According to the present invention, by mixing sewage sludge which is an environmental pollutant and waste oil to produce a fuel for cement clinker firing, it is not only possible to replace bituminous coal or bunker C oil, which is an auxiliary fuel for cement clinker firing, but also to the sewage sludge and After combustion of the waste oil, the residue of the cement clinker may be used to treat the sewage sludge and the waste oil without fear of secondary contamination.
    权利要求:
    Claims (6)
    [1" claim-type="Currently amended] A furnace for drying the dewatered sewage sludge; And
    A raw material manufacturing system for cement clinker firing comprising a mixer for mixing the dry sewage sludge and waste oil by having a waste oil injector for injecting waste oil into the sewage sludge dried through the heating furnace.
    [2" claim-type="Currently amended] Preparing dried sewage sludge having a water content of 25% or less by heating the dehydrated sewage sludge in a heating furnace to evaporate moisture;
    Raw material manufacturing method for cement clinker firing comprising the step of mixing the dry sewage sludge and waste oil.
    [3" claim-type="Currently amended] The method according to claim 2, wherein the heating furnace in the step of producing the dry sewage sludge is maintained at a pressure lower than atmospheric pressure to suppress oxidation of the sewage sludge.
    [4" claim-type="Currently amended] The method of claim 2, wherein the heating furnace in the step of manufacturing the dry sewage sludge is blocked by direct contact between the sewage sludge and a heat source to suppress oxidation of the sewage sludge. .
    [5" claim-type="Currently amended] The method of claim 2, wherein the mixing step is performed at a pressure lower than atmospheric pressure to prevent combustion of the sewage sludge during mixing.
    [6" claim-type="Currently amended] Sewage sludge whose water content is 25% or less by weight and whose solid content is silicon, aluminum and iron oxides, which are components of the cement clinker;
    Raw material for firing cement clinker comprising waste oil uniformly mixed in the sewage sludge in order to increase the calorific value of the sewage sludge.
    类似技术:
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-09-26|Application filed by 임하진, (주)티에이엔
    2000-09-26|Priority to KR1020000056404A
    2000-09-26|Priority claimed from KR1020000056404A
    2002-04-01|Publication of KR20020024642A
    2002-09-18|Application granted
    2002-09-18|Publication of KR100353394B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020000056404A|KR100353394B1|2000-09-26|Fuels for clinker fabrication using waste-water sludges, and manufacturing system and method thereof|
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