CN111348649A - Process for preparing activated carbon by using resource conditions of cement production line - Google Patents
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- CN111348649A CN111348649A CN202010175395.4A CN202010175395A CN111348649A CN 111348649 A CN111348649 A CN 111348649A CN 202010175395 A CN202010175395 A CN 202010175395A CN 111348649 A CN111348649 A CN 111348649A
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- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
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Abstract
The invention discloses a process for preparing activated carbon by using resource conditions of a cement production line, which comprises the following steps: by utilizing oxygen production equipment in cement production, nitrogen separated in the production process is stored, and a nitrogen storage tank is connected with a carbonization furnace; carbon dioxide captured from the flue gas of the cement kiln is stored and collected, and a carbon dioxide storage tank is connected with the activation furnace; feeding the carbonaceous material and nitrogen into a carbonization furnace for heating and carbonizing treatment, and removing non-carbon elements to prepare a carbonized material with an initial pore structure; and (2) feeding the prepared carbonized material and carbon dioxide into an activation furnace for heating treatment, wherein the carbonized material is subjected to partial oxidation reaction of carbon atoms in the graphite microcrystal by using the carbon dioxide as an oxidizing gas at high temperature, and meanwhile, some volatile components are removed from the graphite microcrystal to form a rich pore structure in the carbon material, so that the activated carbon product is prepared. Which can prepare the activated carbon product by utilizing the resource conditions of the cement kiln.
Description
Technical Field
The invention relates to the technical field of cement, in particular to a process for preparing activated carbon by utilizing resource conditions of a cement production line.
Background
The active carbon is a multifunctional adsorbent, has good adsorption performance, and can be prepared by processing carbonaceous raw materials (biomass, mineral substances, plastics and the like) through a series of procedures by a physical method or a chemical method. The preparation process of the active carbon mainly comprises two important links of carbonization and activation. The main purpose of the carbonization process is to remove non-carbon elements, so that the carbonized material obtains necessary strength and forms an initial pore structure. Using N in general2Or rare inert gas is used as the carbonization protective gas. The activation process develops the pore structure of the carbonized material in the same direction, and further forms more abundant pore structures. The activation process is basically divided into a physical activation method, also called a gas activation method, in which a carbonized material is subjected to CO at a high temperature2And oxidizing gas is used for causing partial oxidation reaction of carbon atoms in the graphite microcrystals, and simultaneously removing some volatile components from the graphite microcrystals to form a rich pore structure in the carbon material.
In the cement production process, the flue gas of the cement kiln contains a large amount of CO2And can collect and prepare CO2Utilizing; and the oxygen-enriched combustion oxygen generation of the cement kiln can additionally produce N2Gas, comprehensive cement technology such as treating CO in flue gas2And nitrogen generated by oxygen production is discharged, so that resources are wasted. Large amounts of CO may be required in industrial production of activated carbon2As activators and N2As the protective gas, if the resource condition of a cement production line can be used for preparing the activated carbon, the cost can be reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a process for preparing activated carbon by using cement production line resource conditions, which can prepare activated carbon products by using cement kiln resource conditions and reduce the cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the process for preparing the activated carbon by utilizing the resource conditions of the cement production line comprises the following steps:
1) by utilizing oxygen production equipment in cement production, nitrogen separated in the production process is stored, and a nitrogen storage tank is connected with a carbonization furnace;
2) carbon dioxide captured from the flue gas of the cement kiln is stored and collected, and a carbon dioxide storage tank is connected with the activation furnace;
3) feeding the carbonaceous material and nitrogen into a carbonization furnace for heating and carbonizing treatment, and removing non-carbon elements to prepare a carbonized material with an initial pore structure;
4) and (2) feeding the prepared carbonized material and carbon dioxide into an activation furnace for heating treatment, wherein the carbonized material is subjected to partial oxidation reaction of carbon atoms in the graphite microcrystal by using the carbon dioxide as an oxidizing gas at high temperature, and meanwhile, some volatile components are removed from the graphite microcrystal to form a rich pore structure in the carbon material, so that the activated carbon product is prepared.
Wherein, the carbonaceous material is required to be pretreated before the step 3): and (3) crushing and drying the carbon-containing material to remove moisture and volatile non-combustible components, and then removing iron from the dried carbon-containing material.
In the step 1), oxygen prepared by the oxygen generating equipment in cement production is used for oxygen-enriched combustion of the cement kiln.
The rear ends of the carbonization furnace and the activation furnace are respectively provided with an induced draft fan, and gas is introduced into the furnace body through the induced draft fans.
And 4) adjusting the pH value of the activated carbon product prepared in the step 4) through an acid-base regulator, and drying to finally prepare the activated carbon product meeting the product requirement.
The waste activated carbon formed after the activated carbon preparation product is used is returned to the cement kiln for replacing fuel for use.
And the carbon dioxide is input into the activation furnace, and the delivery amount of the carbon dioxide is controlled by a gas flowmeter.
All be equipped with the manometer on nitrogen gas storage jar and the carbon dioxide storage jar.
The outlet of the draught fan is correspondingly connected with a gas purification processor, and gas discharged from the draught fan is finally discharged into the atmosphere through purification treatment.
And conveying combustible gas discharged by the draught fan to a decomposing furnace of a cement production line, and entering the decomposing furnace for combustion treatment.
Compared with the prior art, the invention has the following advantages:
the process for preparing the activated carbon by using the resource conditions of the cement production line has reasonable design, can prepare activated carbon products by using the resource conditions of the cement kiln, effectively treats wastes such as carbon-containing biomass, sludge, waste paper and the like, reduces the cost and has good environmental protection value.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the process for preparing activated carbon according to the present invention.
FIG. 2 is a schematic view of the pretreatment of carbonaceous material according to the present invention.
FIG. 3 is a schematic view of the present invention for preparing activated carbon by carbonization and activation.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in figures 1 to 3, the process for preparing the activated carbon by utilizing the resource conditions of the cement production line fully utilizes the resource technical conditions of a cement plant, utilizes the oxygen generation and separation of the fused oxygen-enriched combustion and the carbon dioxide collected from the smoke of the cement kiln to prepare the activated carbon product with high adsorption performance by taking wastes such as carbon-containing biomass, sludge, waste paper and the like as raw materials.
The carbon-containing material in the process of preparing the activated carbon by utilizing the resource conditions of the cement production line is N2Under the protection of gas environment and a certain temperature, removing non-carbon elements to ensure that the carbonized material obtains necessary strength and forms an initial pore structure to finish the carbonization process; the carbonized material utilizes CO at high temperature2As an oxidizing gas, carbon atoms present in the graphite crystallites are partially oxidized, and at the same time some of the volatile components are removed from the graphite crystallites, inside the carbon materialForming abundant pore structures to prepare an activated carbon product; the preparation technology of the process has the advantages of cyclicity and economy. The carbon content of the activated carbon product is more than 90 percent, and the initial heating value is generally more than 7000 kcal/kg. The activated carbon as an adsorbent material can be applied to environmental protection treatment such as deodorization, water purification and the like in the cement industry, and when the activated carbon is repeatedly used for many times, the adsorption performance of the activated carbon is weakened, the waste activated carbon can also be used as a furnace substitute fuel.
The process for preparing the activated carbon by utilizing the resource conditions of the cement production line comprises the following steps:
by utilizing oxygen production equipment in cement production, nitrogen separated in the production process is stored, and a nitrogen storage tank is connected with a carbonization furnace;
carbon dioxide captured from the flue gas of the cement kiln is stored and collected, and a carbon dioxide storage tank is connected with the activation furnace;
pretreating the carbonaceous material: crushing and drying the carbon-containing material to remove moisture and volatile non-combustible components, and then removing iron from the dried carbon-containing material; inputting the treated dry carbonaceous material and nitrogen into a carbonization furnace for heating and carbonization treatment, and removing non-carbon elements to prepare a carbonized material with an initial pore structure;
and (2) feeding the prepared carbonized material and carbon dioxide into an activation furnace for heating treatment, wherein the carbonized material is subjected to partial oxidation reaction of carbon atoms in the graphite microcrystal by using the carbon dioxide as an oxidizing gas at high temperature, and meanwhile, some volatile components are removed from the graphite microcrystal to form a rich pore structure in the carbon material, so that the activated carbon product is prepared.
Pressure gauges are arranged on the nitrogen storage tank and the carbon dioxide storage tank; the carbon dioxide is input into the activation furnace, and the delivery amount of the carbon dioxide is controlled by a gas flowmeter.
Oxygen prepared by oxygen generating equipment in cement production is used for oxygen-enriched combustion in a cement kiln; the rear ends of the carbonization furnace and the activation furnace are respectively provided with an induced draft fan, and gas is introduced into the furnace body through the induced draft fans.
The outlet of the induced draft fan is correspondingly connected with a gas purification processor, and gas discharged by the induced draft fan is finally discharged into the atmosphere through purification treatment; combustible gas discharged by the induced draft fan is conveyed to a decomposing furnace of a cement production line and enters the decomposing furnace for combustion treatment.
And adjusting the pH value of the prepared activated carbon product through an acid-base regulator, and drying to finally prepare the activated carbon product meeting the product requirement.
The waste activated carbon formed after the activated carbon product is prepared and used is returned to the cement kiln to be used for replacing fuel, so that the cost is reduced, and the environment is protected.
The process for preparing the activated carbon has reasonable design, can prepare activated carbon products by utilizing the resource conditions of the cement kiln, effectively treats wastes such as carbon-containing biomass, sludge, waste paper and the like, reduces the cost and has good environmental protection value.
The preferable specific process route is as follows:
1) pretreatment of carbonaceous materials: because the carbon-containing materials are different in size, moisture and carbon content, firstly, the carbon-containing materials are crushed and dried to remove moisture and volatile non-combustible components, the dried carbon-containing materials are subjected to metal removal through an iron removal device, and finally, the dried and sorted pretreated carbon-containing materials are stored in a closed container through conveying equipment.
2) Oxygen plant N2And (3) a gas conveying process: production of O by cement production line oxygen production equipment2When N is present2Separate deposit as an additional product into N2In the gas storage device, the storage device is provided with a gas pressure gauge to ensure the tightness. N is a radical of2The storage device is connected with the inlet end of the carbonization furnace through a gas pipeline, N2The gas conveying pipeline is provided with a gas flowmeter, and N can be adjusted according to the carbonization yield2The conveying amount is used for ensuring the proper inert condition of the reaction environment of the carbonization furnace.
3) CO trapped by carbon dioxide in cement kiln2And (3) a gas conveying process: CO prepared by capturing carbon dioxide in cement kiln2Except that a part of the product is produced as dry ice and the like, a part of CO with the purity of 99 percent2In a gas-tight container, the storage device is provided with a gas pressure gauge to ensure tightnessAnd the active carbon is used as an activating agent for producing the active carbon. CO 22The storage device is connected with the inlet end of the activation furnace through a gas pipeline, and CO is2The gas transmission pipeline is provided with a gas flowmeter, and CO can be adjusted according to the yield and quality of the active carbon2The conveying amount is used for ensuring the proper reaction condition of the activation furnace without CO2Too high usage of the activating agent causes too much reaction of the carbonized material, damages the structures of mesopores and micropores of the activated carbon material, causes the increase of the number of coarse pores and causes the small specific surface area of the activated carbon; is not caused by CO2The carbonization material is incompletely reacted due to too little activating agent, an effective certain number of mesopore and micropore structures are not formed, and the specific surface area of the activated carbon is small.
4) Carbonizing and activating furnace device: the carbonization and activation furnace device is core key equipment for carbonizing and activating carbon-containing materials, and the rear end of the furnace body device is provided with an induced draft fan:
firstly, carbon-containing materials are fed into a furnace body device through conveying equipment, and an induced draft fan feeds N into the furnace body device2Introducing gas into the furnace, heating the furnace body to a certain temperature by a heating device for carbonization treatment, and preparing a carbonized material; gas discharged by the induced draft fan is purified by a gas disposal container, and finally harmless gas is discharged into the atmosphere;
secondly, the prepared carbonized material is activated in a furnace body device. The air inlet pipeline at the end of the furnace body is switched to CO2Gas pipeline, induced draft fan to discharge CO2Introducing gas into the activation furnace, and setting reasonable CO through a flowmeter2And (4) heating the activation furnace to a certain temperature through a heating device to carry out activation treatment, so as to obtain the primary activated carbon material. In the activation process, gas (containing combustible gas such as CO) discharged by the draught fan is connected with a cement production line decomposing furnace through a gas conveying pipeline and enters the decomposing furnace for combustion treatment, so that the gas can replace part of fuel.
And finally, adjusting the pH value of the prepared primary activated carbon through a pH adjusting device to meet the product requirement, and drying through a drying device to finally prepare the activated carbon product.
The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.
The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (10)
1. A process for preparing activated carbon by utilizing resource conditions of a cement production line is characterized by comprising the following steps: the process for preparing the activated carbon comprises the following steps:
1) by utilizing oxygen production equipment in cement production, nitrogen separated in the production process is stored, and a nitrogen storage tank is connected with a carbonization furnace;
2) carbon dioxide captured from the flue gas of the cement kiln is stored and collected, and a carbon dioxide storage tank is connected with the activation furnace;
3) feeding the carbonaceous material and nitrogen into a carbonization furnace for heating and carbonizing treatment, and removing non-carbon elements to prepare a carbonized material with an initial pore structure;
4) and (2) feeding the prepared carbonized material and carbon dioxide into an activation furnace for heating treatment, wherein the carbonized material is subjected to partial oxidation reaction of carbon atoms in the graphite microcrystal by using the carbon dioxide as an oxidizing gas at high temperature, and meanwhile, some volatile components are removed from the graphite microcrystal to form a rich pore structure in the carbon material, so that the activated carbon product is prepared.
2. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: the carbonaceous material is required to be pretreated before the step 3): and (3) crushing and drying the carbon-containing material to remove moisture and volatile non-combustible components, and then removing iron from the dried carbon-containing material.
3. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: in the step 1), oxygen prepared by the oxygen generating equipment in cement production is used for oxygen-enriched combustion of the cement kiln.
4. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: the rear ends of the carbonization furnace and the activation furnace are respectively provided with an induced draft fan, and gas is introduced into the furnace body through the induced draft fans.
5. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: and 4) adjusting the pH value of the activated carbon product prepared in the step 4) through an acid-base regulator, and drying to finally prepare the activated carbon product meeting the product requirement.
6. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: the waste activated carbon formed after the activated carbon preparation product is used is returned to the cement kiln for replacing fuel for use.
7. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: and the carbon dioxide is input into the activation furnace, and the delivery amount of the carbon dioxide is controlled by a gas flowmeter.
8. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 1, wherein: all be equipped with the manometer on nitrogen gas storage jar and the carbon dioxide storage jar.
9. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 5, wherein: the outlet of the draught fan is correspondingly connected with a gas purification processor, and gas discharged from the draught fan is finally discharged into the atmosphere through purification treatment.
10. The process for preparing activated carbon by using the resource conditions of the cement production line as claimed in claim 5, wherein: and conveying combustible gas discharged by the draught fan to a decomposing furnace of a cement production line, and entering the decomposing furnace for combustion treatment.
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Citations (5)
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| JPH11171524A (en) * | 1997-10-03 | 1999-06-29 | Katsuhiro Shimada | Active carbon made from waste paper and its production |
| CN101332991A (en) * | 2008-07-31 | 2008-12-31 | 福建师范大学 | Method for preparing tung shell-based activated carbon by gas oxidation method |
| CN102140708A (en) * | 2011-01-27 | 2011-08-03 | 济南大学 | Active carbon fiber and preparation method thereof |
| CN107824026A (en) * | 2017-11-15 | 2018-03-23 | 安徽海螺建材设计研究院 | A kind of cement kiln flue gas collecting carbonic anhydride treater |
| CN208200391U (en) * | 2018-04-17 | 2018-12-07 | 光大环保技术研究院（南京）有限公司 | The system for preparing coupling synthesis gas power generation for active carbon |
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2020
- 2020-03-13 CN CN202010175395.4A patent/CN111348649A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11171524A (en) * | 1997-10-03 | 1999-06-29 | Katsuhiro Shimada | Active carbon made from waste paper and its production |
| CN101332991A (en) * | 2008-07-31 | 2008-12-31 | 福建师范大学 | Method for preparing tung shell-based activated carbon by gas oxidation method |
| CN102140708A (en) * | 2011-01-27 | 2011-08-03 | 济南大学 | Active carbon fiber and preparation method thereof |
| CN107824026A (en) * | 2017-11-15 | 2018-03-23 | 安徽海螺建材设计研究院 | A kind of cement kiln flue gas collecting carbonic anhydride treater |
| CN208200391U (en) * | 2018-04-17 | 2018-12-07 | 光大环保技术研究院（南京）有限公司 | The system for preparing coupling synthesis gas power generation for active carbon |
Non-Patent Citations (2)
| Title |
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| 张宗见: "ZnO/活性炭纤维复合材料的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
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