TW202014528A - Preparation method and system of combustion-supporting agent dehydrating converter sludge to generate a mud cake - Google Patents

Abstract

This invention relates to a preparation method and a system for combustion-supporting agent. The method includes: dehydrating converter sludge to generate a mud cake, wherein the mud cake contains 40wt%-70wt% of iron oxide, 10wt%-30wt% of calcium oxide and 20wt%-40wt% of water; adding 0.1wt%-0.0001wt% of the mud cake into a fuel according to the total weight of the fuel; and uniformly stirring the mud cake and the fuel, wherein the 0.1wt%-0.0001wt% of mud cake is used as a combustion-supporting agent in the fuel. The system includes a converter smoke recovery device for recovering converter smoke by using a wet recycle method to generate the converter sludge, a dehydrating equipment for dehydrating the converter sludge to generate the mud cake, a combustion device provided with the fuel and used for adding the 0.1wt%-0.0001wt% of the mud cake into the fuel according to the total weight of the fuel, and a stirring device for uniformly mixing and stirring the mud cake and the fuel. Accordingly, the present invention enables resources to be efficiently utilized and reduce pollution emission.

Description

Method and system for preparing combustion aid

The invention is a preparation method and system of a combustion aid, in particular to a preparation method and system of a combustion aid using recovered converter dust and mud.

As my country's economy continues to develop rapidly, the urbanization process accelerates, the population continues to increase, and the annual coal consumption has increased substantially year by year. Coal combustion is the main method of coal utilization. my country's energy structure is mainly dominated by coal, causing serious pollution to the environment.

Secondly, more and more people use transportation, however, people must pay a very high price for this. Because the number of steam locomotives increases day by day, the pollution produced also expands, and the greenhouse gases and suspended particles of the exhaust gas generated by the transportation will have a great impact on our health and living environment. Since 2005, many countries have successively announced and promoted a ban on the sale of fuel-fueled vehicles. They plan to ban the sale of some or all fossil fuels (including gasoline, liquefied petroleum gas, and diesel) as power sources in the next few decades. Vehicles to achieve the goals of improving air pollution and slowing down global warming.

In summary, how to efficiently use resources and minimize emission pollution has become an urgent task before us. Therefore, there is an urgent need to develop a powerful coal-burning additive to achieve complete combustion, thereby reducing pollutant emissions.

In view of the incomplete fuel consumption of automobiles and locomotives and the serious pollution of the environment caused by coal burning in factories, the increase of greenhouse gases and suspended particulates affects our health and living environment. The purpose of the present invention is to provide a method and system for preparing a combustion aid to complete combustion in a steam locomotive or factory to reduce environmental pollution and reduce suspended particulates, sulfur oxides, nitrogen oxides and volatile organic compounds The purpose of emitting and increasing combustion efficiency.

In order to achieve the above object, the present invention provides a method for preparing a combustion aid and a system thereof. The preparation of the combustion aid uses recycling of steelmaking converter dust, which is a by-product produced during the steelmaking process of the converter. With high iron content, high calcium content, high water content, and its fineness, high viscosity, high activity, and many debris, the converter dust and sludge system is a valuable secondary resource. If it is not recycled, it is not only a waste In addition to mineral resources, it will also occupy a lot of land area and pollute the environment.

At present, most of the converter dust recovery is based on the wet method, and the converter dust is produced in the form of dust sludge. According to relevant statistics, my country's steel output has stabilized at more than 800 million tons in recent years. For every ton of steel produced, more than 100 kg of iron-bearing dust and sludge are produced. my country's annual production of iron-bearing dust and sludge is more than 80 million tons. Steel production includes sintering, pelletizing, iron making and other procedures. Each production procedure is equipped with dust removal equipment to ensure that emissions are up to standard. Iron-containing dust and sludge are the particles collected in the dust removal process, and the dust or dust generated in the steel production process, such as sintered dust, blast furnace gas ash, mud, converter dust and oxide scale, etc. Under normal circumstances, the amount of iron-containing dust and iron scale accounts for about 6 to 10% of the steel output. Most of the dust particles are very fine and often contain harmful impurities such as lead, zinc and alkali metal oxides and should be recycled.

In order to achieve the above object, the present invention can provide a method for preparing a combustion aid, which can include: (a) dewatering a converter dust sludge to produce a mud cake, the mud cake including 40wt%~70wt% iron oxide, 10wt%~ 30wt% calcium oxide and 20wt%~40wt% Water; (b) add 0.1wt% to 0.0001wt% of the mud cake to the fuel relative to the total weight of a fuel; and (c) mix and mix the mud cake and the fuel; wherein, 0.1wt % To 0.0001wt% of the mud cake acts as a combustion aid in the fuel.

In the aforementioned method for preparing a combustion aid of the present invention, after the step of generating the mud cake may further include a first combustion step, in which the fuel reacts to form a nitrogen oxide, a sulfur oxide, A hydrocarbon or a suspended particle.

In the foregoing preparation method of the combustion aid of the present invention, after the mud cake and the fuel are mixed and stirred, a second combustion step may be further included, and the second combustion step may include a temperature range between 200°C and 700°C In one embodiment, the reaction temperature may be between 250°C and 650°C; in another embodiment, the reaction temperature may be between 300°C and 600°C.

In the aforementioned preparation method of the combustion aid of the present invention, when the reaction temperature can be between 400°C and 500°C, Fe ^{3+ on the} surface of the iron oxide is reduced to Fe ²⁺ via carbon monoxide, and then Fe ²⁺ oxidizes the nitrogen The substance is reduced to a nitrogen gas. The total reaction formula is as follows: C+1/2O ₂ →1/2N ₂ +CO ₂ (Equation 1)

In the foregoing preparation method of the combustion aid of the present invention, the fuel may be a solid fuel or a liquid fuel; wherein, the solid fuel may include coal, a combustible black or brownish black sedimentary rock, a coke or a carbonaceous substance The liquid fuel may include one or more liquid hydrocarbons, including a fishing boat fuel, an automobile fuel, a locomotive fuel, a diesel, a crude oil, or a coal-fired boiler fuel.

In order to achieve the other object mentioned above, the present invention can provide a preparation system for a combustion aid, which can include a converter soot recovery device, a dehydration device, a combustion device and a stirring device. First, the converter soot recovery device can recover a converter soot through a wet process to produce a converter dust. Secondly, the dewatering equipment can convert the converter dust and mud Dehydration is performed to produce a mud cake, which includes 40 wt% to 70 wt% iron oxide, 10 wt% to 30 wt% calcium oxide, and 20 wt% to 40 wt% water. In addition, the combustion device may be provided with a fuel, and 0.1% to 0.0001% by weight of the mud cake is added to the fuel relative to the total weight of the fuel. Furthermore, the stirring device can mix and stir the mud cake and the fuel; wherein, 0.1 wt% to 0.0001 wt% of the mud cake is used as a combustion aid in the fuel.

In the aforementioned preparation system of the combustion aid of the present invention, after the mud cake is produced, a first combustion step may be performed in the combustion device, in which the fuel reacts to form a nitrogen oxide and a sulfur Oxide, a hydrocarbon or a suspended particulate.

In the aforementioned preparation system of the combustion aid of the present invention, after the mud cake and the fuel are mixed and stirred, a second combustion step may be performed in the combustion device, and the combustion step includes a temperature range of 200°C to 700°C A reaction temperature between. In one embodiment, the reaction temperature may be between 250°C and 650°C; in another embodiment, the reaction temperature may be between 300°C and 600°C.

In the aforementioned preparation system of the combustion aid of the present invention, when the reaction temperature is between 400°C and 500°C, Fe ^{3+ on the} surface of the iron oxide is reduced to Fe ²⁺ via carbon monoxide, and then Fe ²⁺ oxidizes the nitrogen The material is reduced to nitrogen.

In the foregoing preparation system of the combustion aid of the present invention, the fuel may be a solid fuel or a liquid fuel; wherein, the solid fuel may include coal-fired, a combustible black or brown-black sedimentary rock, a coke or a carbonaceous substance The liquid fuel may include one or more liquid hydrocarbons, including a fishing boat fuel, an automobile fuel, a locomotive fuel, a diesel, a crude oil, or a coal-fired boiler fuel.

Based on the above many advantages, and in order for the reviewing committee to further understand the present invention, a preferred embodiment is disclosed as follows, in conjunction with the drawings and drawing numbers, The detailed description of the composition of the present invention and the effect achieved by it are as follows.

1‧‧‧Combustion agent preparation system

10‧‧‧Converter soot recovery device

11‧‧‧Converter soot

12‧‧‧Converter dust and mud

20‧‧‧Dehydration equipment

21‧‧‧ Mud cake

21’‧‧‧combustion aid

30‧‧‧Combustion device

301‧‧‧ Nitrogen oxide

302‧‧‧Sulfur oxide

303‧‧‧Hydrocarbon

304‧‧‧ suspended particles

31‧‧‧ Fuel

40‧‧‧Stirring device

1 is a flow chart of the preparation method of the combustion aid of Example 1 of the invention; FIG. 2 is a block diagram of the preparation method of the combustion aid of Example 1 of the invention; FIG. 3 is a preparation system of the combustion aid of Example 2 of the invention 4 is a block diagram of a preparation system for a combustion aid according to Embodiment 2 of the present invention.

The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. In addition, the present invention can also be implemented or applied by other different specific embodiments, and various modifications and changes can be made without departing from the spirit of the present invention.

Please refer to FIG. 1 to FIG. 2. FIG. 1 is a flowchart of the method for preparing the combustion aid of Embodiment 1 of the present invention; and FIG. 2 is a block diagram of the method of preparing the combustion aid of Embodiment 1 of the present invention.

As shown in FIG. 2, by-products of molten steel and converter dust 12 are produced in the steelmaking process of the converter. As shown in FIG. 1, an embodiment of the present invention is a method for preparing a combustion aid, including step S101: The converter dust 12 is dehydrated to produce a mud cake 21, which includes 40wt%~70wt% iron oxide, 10wt%~30wt% calcium oxide and 20wt%~40wt% water; Step S102: relative to a fuel The total weight of 31, add 0.1wt% to 0.0001wt% of the mud cake 21 to the fuel 31; and step S103: the mud cake 21 and the fuel 31 are mixed and stirred; wherein, 0.1wt% to 0.0001wt% The mud cake 21 is used as a combustion aid 21' in the fuel 31.

As shown in FIG. 1, after the step of producing the mud cake, a first combustion step (step S1011) is further included, in which the fuel reacts to form a nitrogen oxide, a sulfur oxide, and a hydrocarbon in the first combustion step Compound or a suspended particle. After the mud cake and the fuel are mixed and stirred, a second combustion step (step S104) is further included. The combustion step includes a reaction temperature ranging from 200°C to 700°C; wherein the reaction temperature is 400 Between ℃ and 500℃, the Fe ^{3+ on the} surface of the iron oxide is reduced to Fe ²⁺ through carbon monoxide, and the Fe ²⁺ reduces the nitrogen oxide to nitrogen, the total reaction formula is as follows: C+1/2O ₂ → 1/2N ₂ +CO ₂ (Formula 1)

Secondly, the converter dust 12 includes the calcium oxide having a desulfurization function, which can reduce the combustion of sulfur oxide emissions.

The fuel is a solid fuel or a liquid fuel; wherein the solid fuel includes coal-fired fuel, and the liquid fuel includes a fishing boat fuel oil, an automobile fuel oil, a locomotive fuel oil, a diesel fuel, or a coal-fired boiler fuel oil. In general coal-fired power plants, coal usually turns into a fine powder, which is burned in the air to generate steam to drive turbines to generate electricity. The entire process is at a high temperature, and the generated pollutants nitric oxide and carbon dioxide are difficult to isolate. Coal does not chemically react with air, but directly reacts with oxygen-containing materials (such as iron oxide).

At the reaction temperature of 400°C, 450°C and 500°C, the higher the reaction temperature is, the higher the activity of the iron oxide is, which can increase the removal efficiency and operation time of the nitrogen oxide and the sulfur oxide. Therefore, the nitrogen The more oxides and sulfur oxides are removed. With the increase of the inflow concentration and the flow rate, whether the nitrogen oxide or the sulfur oxide is in contact with the iron powder, the iron powder participating in the reaction is consumed faster, which reduces the effect of the removal rate. The combustion aid 21' used in the present invention can increase the combustion of the fuel 31 by 15% to 20% in the second combustion step, and can effectively remove the sulfur oxidation generated by the fuel 31 in the first combustion process Matter 25%~35%, removal of nitrogen oxides 20%~60%, removal of carbon monoxide and the hydrocarbon 50%~70%, removal of soot 50%~70%.

Please refer to FIG. 3 to FIG. 4. FIG. 3 is a schematic diagram of the combustion aid preparation system according to Embodiment 2 of the present invention; and FIG. 4 is a block diagram of the combustion aid preparation system according to Embodiment 2 of the present invention.

As shown in FIGS. 3 and 4, Embodiment 2 of the present invention is a combustion aid preparation system 1, which may include a converter dust recovery device 10, a dehydration device 20, a combustion device 30 and a stirring device 40. First, the converter soot recovery device 10 can recover a converter soot 11 through a wet process to produce a converter dust 12. Secondly, the dewatering equipment 20 can dehydrate the converter dust 12 to produce a mud cake 21, the mud cake 21 includes 40wt%~70wt% iron oxide, 10wt%~30wt% calcium oxide and 20wt%~40wt% Water. In addition, the combustion device 30 may be provided with a fuel 31, and 0.1% to 0.0001% by weight of the mud cake 21 is added to the fuel 31 relative to the total weight of the fuel 31. Furthermore, the stirring device 40 can mix and stir the mud cake 21 and the fuel 31; wherein, 0.1 wt% to 0.0001 wt% of the mud cake 21 is used as a combustion aid 21' in the fuel 31.

As shown in FIGS. 3 and 4, after the mud cake 21 is produced, a first combustion step may be performed in the combustion device 30, in which the fuel 31 reacts to form a nitrogen oxide 301, a Sulfur oxide 302, a hydrocarbon 303 or a suspended particulate 304. As shown in FIG. 4, after the mud cake 21 and the fuel 31 are mixed and stirred, a second combustion step may be performed in the combustion device 30. The combustion step includes a temperature range between 200°C and 700°C. One reaction temperature. When the reaction temperature is between 400°C and 500°C, the Fe ^{3+ on the} surface of the iron oxide is reduced to Fe ²⁺ via carbon monoxide, and the Fe ²⁺ reduces the nitrogen oxide 301 to nitrogen to reduce the nitrogen oxidation The amount of 301 emissions. Secondly, the iron oxide in the mud cake 21 can reduce the nitrogen oxide 301 to generate nitrogen gas, which can effectively suppress dioxin.

The present invention will be tested in three ways. First, add the oxidizer to the fuel tank of automobile, locomotive fuel, diesel or fishing boat and mix it with the fuel, then test the tail row of automobile, locomotive, diesel vehicle or fishing boat, and add the front and rear tail row The nitrogen oxide Emissions of substances, the sulfur oxides, the suspended particulates and the hydrocarbons. Secondly, the fuel consumption of the fuel oil of small-scale factory fuel boilers before and after the addition of the oxidant, and the emissions of the nitrogen oxides, the sulfur oxides, the suspended particulates and the hydrocarbons. Furthermore, the amount of fuel used before and after adding the oxidant to the medical waste incinerator, and the emissions of the nitrogen oxides, the sulfur oxides, the suspended particulates, the hydrocarbons, and dioxin.

The application range of the combustion aid of the present invention includes: 1. Use of fuel oil for steam and diesel locomotives; 2. Use of fuel oil (diesel) for fishing boats; 3. Use of internal and external fuel oil and coal-fired boilers; 4. Incinerator, medical waste Adding to the burning of the material treatment site; 5. Adding to the use of animal carcasses incineration; and 6. Adding to the use of thermal power plants, generator fuel, and coal-fired power generation.

With the preparation method and system of the combustion aid of the present invention, the produced combustion aid can be used as a fuel additive for small fuel boilers, which can increase the combustion efficiency, reduce the amount of fuel, coal, and reduce suspended particulates (PM2.5, PM10 and CH), nitrogen oxides and sulfur oxides emissions. Secondly, the combustion aid can also be used as a fuel additive for diesel, gas, and locomotives, which can reduce fuel consumption, increase horsepower, and reduce emissions of suspended particulates (PM2.5, PM10, and CH), nitrogen oxides, and sulfur oxides.

The above embodiments are only examples for the convenience of description, and the scope of rights claimed by the present invention should be subject to the scope of the patent application, and not limited to the above embodiments.

1‧‧‧Combustion agent preparation system

10‧‧‧Converter soot recovery device

11‧‧‧Converter soot

20‧‧‧Dehydration equipment

21‧‧‧ Mud cake

30‧‧‧Combustion device

31‧‧‧ Fuel

40‧‧‧Stirring device

Claims (10)

A method for preparing a combustion aid includes: (a) dewatering a converter dust sludge to produce a mud cake, the mud cake including 40 wt% to 70 wt% iron oxide, 10 wt% to 30 wt% calcium oxide and 20 wt% to 40 wt % Water; (b) add 0.1wt% to 0.0001wt% of the mud cake to the fuel relative to the total weight of a fuel; and (c) mix and mix the mud cake and the fuel; wherein, 0.1 The wt% to 0.0001 wt% of the mud cake acts as a combustion aid in the fuel. The method for preparing a combustion aid as described in item 1 of the patent application scope, wherein after the step of generating the mud cake, a first combustion step is further included, in which the fuel reacts to form a nitrogen oxide, A sulfur oxide, a hydrocarbon or a suspended particulate. The method for preparing a combustion aid as described in item 1 of the patent application scope, wherein after the mud cake and the fuel are mixed and stirred, a second combustion step is further included. The second combustion step includes a temperature range of 200°C~ A reaction temperature between 700 °C. The method for preparing a combustion aid as described in item 3 of the patent application scope, wherein, when the reaction temperature is between 400°C and 500°C, Fe ^{3+ on the} surface of the iron oxide is reduced to Fe ²⁺ , Fe ² via carbon monoxide ⁺ Then reduce the nitrogen oxide to nitrogen. The method for preparing a combustion aid as described in item 1 of the patent application scope, wherein the fuel is a solid fuel or a liquid fuel. A combustion aid preparation system includes: a converter soot recovery device that recovers a converter soot through a wet process to produce a converter dust and sludge; and a dehydration device that dehydrates the converter soot to produce a mud cake, the mud cake package Including 40wt% ~ 70wt% iron oxide, 10wt% ~ 30wt% calcium oxide and 20wt% ~ 40wt% water; a combustion device, set a fuel, relative to the total weight of the fuel, 0.1wt% to 0.0001wt % Of the mud cake is added to the fuel; and a stirring device, the mud cake and the fuel are mixed and stirred; wherein, 0.1 wt% to 0.0001 wt% of the mud cake is used as a combustion aid in the fuel. The preparation system for a combustion adjuvant as described in item 6 of the patent application scope, wherein, after the mud cake is produced, a first combustion step is performed in the combustion device, and the fuel reacts to form a nitrogen in the first combustion step Oxide, a sulfur oxide, a hydrocarbon or a suspended particulate. A preparation system for a combustion aid as described in item 6 of the patent application scope, wherein after the mud cake and the fuel are mixed and stirred, a second combustion step is performed in the combustion device, and the second combustion step includes a temperature range A reaction temperature between 200 ℃ ~ 700 ℃. The system for preparing a combustion aid described in item 8 of the patent application scope, wherein, when the reaction temperature is between 400°C and 500°C, Fe ^{3+ on the} surface of the iron oxide is reduced to Fe ²⁺ , Fe ²⁺ via carbon monoxide Then reduce the nitrogen oxide to nitrogen. The system for preparing a combustion aid as described in item 6 of the patent application scope, wherein the fuel is a solid fuel or a liquid fuel.

Images