CN111100960A - Method for improving combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of iron and steel plant - Google Patents
Method for improving combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of iron and steel plant Download PDFInfo
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- CN111100960A CN111100960A CN201911291397.3A CN201911291397A CN111100960A CN 111100960 A CN111100960 A CN 111100960A CN 201911291397 A CN201911291397 A CN 201911291397A CN 111100960 A CN111100960 A CN 111100960A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
- C21B5/004—Injection of slurries
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Abstract
The invention discloses a method for improving the combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of a steel plant, which comprises the following steps: carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake; the oil sludge cake and raw coal or pulverized coal are proportioned and premixed in proportion to obtain a primary mixture; and adding the primary mixture into raw coal in proportion, and then carrying out wet grinding to obtain a final-grade mixture, wherein the final-grade mixture is used as pulverized coal for blast furnace injection. The method of the invention realizes the purpose of uniformly mixing the viscous oil sludge with the pulverized coal, so that the combustion rate of the final mixture used as the pulverized coal for blast furnace injection is obviously improved and the combustion stability is ensured. The method of the invention not only improves the combustion rate of the pulverized coal for blast furnace injection, but also effectively utilizes the oil sludge which is difficult to use originally.
Description
Technical Field
The invention belongs to the technical field of blast furnace coal injection, and particularly relates to a method for improving the combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of a steel plant.
Background
The use of coal powder to partially replace coke is one of the main means for reducing the production cost of blast furnaces, and most of blast furnaces in China select pulverized coal for injection, and the granularity of the pulverized coal is generally below 74 um. After the pulverized coal enters a rotary area of the blast furnace along with compressed air, the pulverized coal cannot be completely combusted due to the limitation of combustion environment and time, and the generated unburned pulverized coal is CO in the blast furnace and the furnace2The slag and the iron continue to react, and the reasonable production amount of the unburned pulverized coal in smelting and the reaction consumption amount of the unburned pulverized coal in the blast furnace are in dynamic balance. If the injection amount of the pulverized coal is continuously increased, the dynamic balance is destroyed, which shows that the fuel consumption of iron per ton is increased, and the economic benefit of production is reduced. It can be seen that the key factor for limiting the further increase of the injection amount of the pulverized coal is the burning rate of the pulverized coal in the rotary area of the blast furnace.
The self-produced oil sludge of iron and steel works mainly comes from steel making and steel rolling, and the oil sludge consists of water, oil and fine iron filings. The just produced oil sludge is in a thin paste shape, after precipitation, the fished oil sludge precipitate still contains a large amount of water and oil, the content of the water and the oil is generally more than 50%, and the rest is scrap iron, so that the iron content is high, and the impurities are few. The oil in the oil sludge is mainly grease such as lubricating oil, lubricating grease, gear oil, hydraulic oil and the like. If the oil sludge is added into the pulverized coal, the thermal decomposition and preferential combustion processes of the oil components in the oil sludge before 500 ℃ can promote the early ignition of the pulverized coal, and the heat value of the fuel is improved; the heat released by the ferroferric oxide in the oil sludge in the oxidation process is supplied to the pulverized coal for combustion, so that the ignition point of the pulverized coal is further reduced, and the combustion of fixed carbon is promoted; the iron oxide can catalyze the carbon-oxygen reaction, so that the reaction speed of the carbon is improved. Therefore, the oil sludge added to the pulverized coal can play a role in improving the combustion rate of the pulverized coal in a rotary area of the blast furnace.
However, the self-produced oil sludge water of steel plants has high oil content and can not be directly matched with pulverized coal for use; and the oil sludge is sticky, the bulk specific gravity of the oil sludge is more important than that of the powdered coal, and the oil sludge and the powdered coal are difficult to be uniformly mixed, so that the combustion rate fluctuation of the powdered coal is large, and the stable smooth operation of a blast furnace is not facilitated. Therefore, it is necessary to develop a technique for improving the combustion rate of pulverized coal for blast furnace injection by using sludge produced by a steel plant.
Disclosure of Invention
The invention aims to solve the problems that the self-produced oil sludge of the steel plant cannot be directly mixed with pulverized coal and is not uniformly mixed due to the reasons of high water content, high oil content, viscosity, higher bulk specific gravity than the pulverized coal bulk ratio and the like, thereby providing a method for improving the combustion rate of the pulverized coal for blast furnace injection by using the self-produced oil sludge of the steel plant.
In order to achieve the above object, the present invention provides a method for increasing a combustion rate of pulverized coal for blast furnace injection using self-produced oil sludge of a steel plant, comprising:
step 1), carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake;
step 2) mixing the oil sludge cake and raw coal or pulverized coal in proportion for premixing to obtain a primary mixture;
and 3) adding the primary mixture into raw coal according to a proportion, and then carrying out damp milling to obtain a final-grade mixture, wherein the final-grade mixture is used as pulverized coal for blast furnace injection.
Preferably, in the step 1), the water and oil content in the oil sludge cake is controlled to be less than 10%.
Preferably, in the step 2), the mass ratio of the oil sludge cake to the raw coal or the pulverized coal is controlled to be 1: 3-20.
Preferably, in the step 2) above, since the sludge is relatively viscous, the sludge cake and the raw or pulverized coal are premixed using strong agitation for the uniformity of the primary mixture.
Preferably, in the step 3), the mass percentage of the oil sludge in the final-stage mixture is controlled to be 0.5-2%, and the proportion of the primary mixture and the raw coal is calculated according to the proportion.
In the method for improving the combustion rate of the pulverized coal for blast furnace injection by using the oil sludge produced by the steel plant, the raw coal is not wet-milled coal, and the pulverized coal is a product obtained by wet-milling the raw coal. In addition, the wet grinding is a process of grinding the raw coal and a process of mixing the primary mixture with the raw coal.
The sludge produced by the iron and steel works may be used alone to increase the combustion rate of the pulverized coal for blast furnace injection, or may be used in combination with other materials contributing to the increase in the combustion rate of the pulverized coal for blast furnace injection. When the oil sludge is mixed with other materials for use, the other materials can be added according to the method of the invention, or can be added into the pulverized coal according to the adding mode of the other materials. Compared with other materials, the self-produced oil sludge of the steel plant has the characteristics of less impurities, high iron content, high heat value and no harm to a blast furnace.
The method has the beneficial effects that: the oil and the ferroferric oxide contained in the iron-containing oil sludge of the iron and steel plant are beneficial to improving the combustion rate of the pulverized coal for blast furnace injection in a blast furnace convolution area, the iron and steel plant has less impurities, high iron content and high heat value, is harmless to a blast furnace, and the oil sludge is used as a substance for improving the combustion rate of the pulverized coal by utilizing the characteristics of the oil sludge produced by the iron and steel plant. The invention adopts the processes of filter pressing, premixing and wet grinding, realizes the purpose of uniformly mixing viscous oil sludge and pulverized coal, obviously improves the combustion rate of the final mixture used as the pulverized coal for blast furnace injection and ensures the combustion stability. The method has simple and reasonable design and easy implementation, improves the combustion rate of the pulverized coal for blast furnace injection, efficiently utilizes the oil sludge which is difficult to use originally, and is very beneficial to the development of the circular economic work of iron and steel plants.
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In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic flow chart showing the method for improving the combustion rate of pulverized coal for blast furnace injection by using self-produced oil sludge of a steel plant according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the method for improving the combustion rate of pulverized coal for blast furnace injection by using self-produced oil sludge of a steel plant according to the present invention comprises: carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake; the oil sludge cake and raw coal/pulverized coal are proportioned according to a proportion and premixed to obtain a primary mixture; the primary mixture is added into raw coal in proportion, and then the mixture is subjected to wet grinding to obtain a final-grade mixture, and the final-grade mixture is used as pulverized coal for blast furnace injection.
Example 1: the method for improving the combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of a steel plant specifically comprises the following steps: carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake; the oil sludge cake and raw coal/pulverized coal are proportioned according to a proportion and premixed to obtain a primary mixture; the primary mixture is added into raw coal in proportion, and then the mixture is subjected to wet grinding to obtain a final-grade mixture, and the final-grade mixture is used as pulverized coal for blast furnace injection.
In example 1, the water and oil contents of the oil sludge cake obtained after the filter pressing treatment of the oil sludge produced by the steel plant were controlled to 10% or less, the mass ratio of the oil sludge cake to the raw coal/pulverized coal was controlled to 1:3, and the ratio of the primary mixture to the raw coal was calculated based on the mass percentage of the oil sludge to the final mixture being 2%.
As an example of practical production of example 1, 20kg of the oil cake was premixed with 60kg of pulverized coal to obtain 80kg of a primary mixture, and then 80kg of the primary mixture was added to 920kg of raw coal to obtain 1000kg of a final mixture by wet grinding. In this practical production example of example 1, the ratio of the primary mixture to the raw coal when forming the final mixture was 1:11.5, and the mass percentage of sludge in the resulting final mixture was 2%.
Example 2: the method for improving the combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of a steel plant specifically comprises the following steps: carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake; the oil sludge cake and raw coal/pulverized coal are proportioned according to a proportion and premixed to obtain a primary mixture; the primary mixture is added into raw coal in proportion, and then the mixture is subjected to wet grinding to obtain a final-grade mixture, and the final-grade mixture is used as pulverized coal for blast furnace injection.
In example 2, the water and oil contents of the oil sludge cake obtained after the filter pressing treatment of the oil sludge produced by the steel plant were controlled to 10% or less, the mass ratio of the oil sludge cake to the raw coal/pulverized coal was controlled to 1:10, and the ratio of the primary mixture to the raw coal was calculated based on the mass percentage of the oil sludge to the final mixture being 1%.
As an example of practical production in example 2, 10kg of sludge cake was premixed with 100kg of pulverized coal to obtain 110kg of a primary mixture, and then the 110kg of the primary mixture was added to 890kg of raw coal, followed by wet grinding to obtain 1000kg of a final mixture. In this practical production example of example 2, the ratio of the primary mixture to the raw coal when forming the final mixture was 1:8, and the mass percentage of sludge in the resulting final mixture was 1%.
Example 3: the method for improving the combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of a steel plant specifically comprises the following steps: carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake; the oil sludge cake and raw coal/pulverized coal are proportioned according to a proportion and premixed to obtain a primary mixture; the primary mixture is added into raw coal in proportion, and then the mixture is subjected to wet grinding to obtain a final-grade mixture, and the final-grade mixture is used as pulverized coal for blast furnace injection.
In example 3, the content of water and oil in an oil sludge cake obtained after filter pressing treatment of the oil sludge produced by the steel plant was 10% or less, the mass ratio of the oil sludge cake to raw coal/pulverized coal was 1:20, and the ratio of the primary mixture to the raw coal was calculated based on the mass percentage of the oil sludge to the final mixture being 0.5%.
As an example of the actual production of example 3, 5kg of the sludge cake was premixed with 100kg of the pulverized coal to obtain 105kg of the primary mixture, and then the 105kg of the primary mixture was added to 895kg of the raw coal, followed by wet grinding to obtain 1000kg of the final mixture. In this practical production example of example 3, the ratio of the primary mixture to the raw coal when forming the final mixture was 1:8.5, and the mass percentage of sludge in the resulting final mixture was 0.5%.
The sludge produced by the iron and steel works may be used alone to increase the combustion rate of the pulverized coal for blast furnace injection, or may be used in combination with other materials contributing to the increase in the combustion rate of the pulverized coal for blast furnace injection. When the oil sludge is mixed with other materials for use, the other materials can be added according to the method of the invention, or can be added into the pulverized coal according to the adding mode of the other materials. Compared with other materials, the self-produced oil sludge of the steel plant has the characteristics of less impurities, high iron content, high heat value and no harm to a blast furnace.
The method of the invention has the advantages that: the oil and the ferroferric oxide contained in the iron-containing oil sludge of the iron and steel plant are beneficial to improving the combustion rate of the pulverized coal for blast furnace injection in a blast furnace convolution area, the iron and steel plant has less impurities, high iron content and high heat value, is harmless to a blast furnace, and the oil sludge is used as a substance for improving the combustion rate of the pulverized coal by utilizing the characteristics of the oil sludge produced by the iron and steel plant. The invention adopts the processes of filter pressing, premixing and wet grinding, realizes the purpose of uniformly mixing viscous oil sludge and pulverized coal, obviously improves the combustion rate of the final mixture used as the pulverized coal for blast furnace injection and ensures the combustion stability. The method has simple and reasonable design and easy implementation, improves the combustion rate of the pulverized coal for blast furnace injection, efficiently utilizes the oil sludge which is difficult to use originally, and is very beneficial to the development of the circular economic work of iron and steel plants.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (5)
1. A method for improving the combustion rate of pulverized coal for blast furnace injection by utilizing self-produced oil sludge of a steel plant is characterized by comprising the following steps:
step 1), carrying out filter pressing treatment on oil sludge produced by a steel plant to obtain an oil sludge cake;
step 2) mixing the oil sludge cake and raw coal or pulverized coal in proportion for premixing to obtain a primary mixture;
and 3) adding the primary mixture into raw coal according to a proportion, and then carrying out wet grinding to obtain a final-grade mixture, wherein the final-grade mixture is used as pulverized coal for blast furnace injection.
2. The method for improving the combustion rate of pulverized coal for blast furnace injection by using the self-produced sludge of a steel and iron plant according to claim 1, wherein in the step 1), the water and oil contents in the sludge cake are controlled to be 10% or less.
3. The method for improving the combustion rate of pulverized coal for blast furnace injection by using oil sludge produced by a steel plant according to claim 2, wherein in the step 2), the mass ratio of the oil sludge cake to raw coal or pulverized coal is controlled to be 1: 3-20.
4. The method for improving the combustion rate of pulverized coal for blast furnace injection by using the self-produced oil sludge of the steel and iron plant as claimed in claim 3, wherein in the step 3), the mass percentage of the oil sludge to the final-stage mixture is controlled to be 0.5% -2%, and the proportion of the primary mixture and the raw coal is calculated according to the proportion.
5. The method for improving the combustion rate of pulverized coal for blast furnace injection using the self-produced oil sludge of the iron and steel plant as claimed in any one of claims 1 to 4, wherein in the step 2), the oil sludge cake is premixed with raw coal or pulverized coal using strong stirring.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108793665A (en) * | 2017-04-28 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of processing method of cold rolling oil-containing waste water biological sludge and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108793665A (en) * | 2017-04-28 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of processing method of cold rolling oil-containing waste water biological sludge and application |
Non-Patent Citations (1)
| Title |
|---|
| 杨作清等: "《钢铁工业水处理实用技术与应用》", 30 June 2015, 冶金工业出版社 * |
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