CN109507359B - Simulation experiment device and test method for moving bed high-temperature calcination reaction - Google Patents
Simulation experiment device and test method for moving bed high-temperature calcination reaction Download PDFInfo
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- CN109507359B CN109507359B CN201811354910.4A CN201811354910A CN109507359B CN 109507359 B CN109507359 B CN 109507359B CN 201811354910 A CN201811354910 A CN 201811354910A CN 109507359 B CN109507359 B CN 109507359B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
A simulation experiment device and a test method for a moving bed high-temperature calcination reaction comprise a particle bed calcination reaction experiment section, a heating system, a horizontal moving system, a plurality of temperature sensors and a data acquisition control system. The heating temperature of the experimental device can reach 1200K at most, carbonate with different calcination reaction temperatures can be researched, the calcination reaction characteristics of the carbonate under the condition that the heat flow on the surface of the calcination section is in alternating heating conditions along with time in the axial direction and the radial direction of the experimental section can be researched, and the calcination reaction characteristics of the carbonate under the condition that the concentration of carbon dioxide in the calcination section is different can be researched.
Description
Technical Field
The invention belongs to the technical field of strengthening of high-temperature calcination reactions of raw materials in the industries of metallurgy, chemical industry and the like, and particularly relates to a simulation experiment device and a test method for a moving bed high-temperature calcination reaction.
Background
Aiming at the characteristics of uneven bed temperature and uneven product quality in the bulk material calcining process in the fields of metallurgy and chemical industry, an effective heating mode is needed to solve the problem of contradiction between heating strengthening and temperature homogenization in the bulk material bed, the product quality is effectively improved, and the method has very important significance for promoting the development of metallurgy and chemical industry.
At present, the experimental research on temperature homogenization and reaction strengthening in the bulk material calcining process is less, and documents indicate that the heating mode that the heat flow changes in a sine mode or a square wave mode along with the time is beneficial to the temperature homogenization of materials, but only single particles are simulated, the model is greatly simplified, and the action characteristic of the alternating heating mode on a bulk material bed layer is unclear. Meanwhile, the existing research simplifies the moving bed into a fixed bed for research, and has certain limitations. Therefore, a moving bed high-temperature calcination reaction simulation experiment device which can be used for laboratory research is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a simulation experiment device and a test method for a moving bed high-temperature calcination reaction, which can be used for researching the influence of the heating rate, the heating mode, the carbon dioxide atmosphere pressure, the particle size and the particle bed porosity on the moving bed high-temperature calcination reaction process in the carbon dioxide atmosphere.
In order to achieve the purpose, the invention adopts the technical scheme that:
a simulation experiment device for moving bed high-temperature calcination reaction comprises:
the experimental section 1 is cylindrical and horizontally arranged, and a granular bed calcination reaction is carried out in the experimental section;
the heating system wraps one section of the experimental section 1, and a radial space exists between the heating system and the experimental section 1 to heat the currently wrapped part, so that the temperature of the heated part is dynamically changed in the axial direction of the experimental section 1;
the horizontal moving system controls the heating system to move along the axial direction of the experimental section 1, so that the part of the experimental section 1, which is wrapped by the heating system, changes along with the axial movement;
and the data acquisition control system 8 is used for acquiring temperature data of different axial and radial positions in the experimental section 1 to obtain the non-uniform distribution of the temperature in the calcining reaction process.
The heating system comprises a plurality of annular heating furnaces connected with the control cabinet, each annular heating furnace sequentially wraps one section of the experiment section 1, and a radial space exists between each annular heating furnace and the experiment section 1.
The dynamic change in the axial direction is: according to the installation sequence, the power of each annular heating furnace is changed in a square wave or sine wave mode.
The horizontal moving system comprises a guide rail 9 connected with the control cabinet and a pulley 10 of the heating system, the current wrapped part of the experimental section 1 is changed by controlling the moving direction and speed of the heating system, and the calcination reaction is carried out at the set heating temperature.
Temperature sensors are arranged at different axial and radial positions inside the experimental section 1.
The experiment section 1 is of a bed layer structure filled with carbonate particles, and can realize dynamic regulation and control of an axial material heating mode.
The atmosphere of the high-temperature calcination reaction in the experimental section 1 is carbon dioxide atmosphere.
The invention also provides a test method of the simulation experiment device for the high-temperature calcination reaction by using the moving bed, which comprises the following steps:
1) controlling the heating power of the experimental section:
the data acquisition control system 8 reads temperature information set by experimental contents, adjusts the power of each heating system, enables the temperature of the carbon dioxide heated by the heating systems to reach a set value, and enables the temperature to dynamically change in the axial direction of the test section (1);
2) horizontal movement control:
controlling the movement speed of a heating system through a horizontal moving system to enable the experimental section 1 to carry out calcination reaction at a set temperature;
3) measurement of internal temperature distribution in experimental section
Reading temperature data of different axial and radial positions in the experimental section 1 through a data acquisition system 8 to obtain non-uniform distribution of temperature in the calcining reaction process;
4) activity measurement of high-temperature calcination reaction product
The weight of the experimental section 1 before and after the experiment is measured, and the generation amount of the carbonate calcination decomposition product is calculated; the activity of the product is converted according to the consumption of the hydrochloric acid under a certain time by hydrating the decomposition product and adding the hydrochloric acid with a certain concentration.
The experimental section of the invention controls the heating power: the heating rate of each heating furnace is preset for the control system, and the circulating current of the heating furnaces is adjusted, so that the heat flow on the surface of the experimental section dynamically changes along with time.
Horizontal movement control: the horizontal movement speed of the heating furnace is preset for the control system, and the rotating speed of a motor of the horizontal movement system of the heating furnace is adjusted to drive the connecting rod mechanism to move, so that the heating furnace moves horizontally.
Measuring the internal temperature distribution of the experimental section: and reading readings of temperature sensors at different radial positions in the experimental section according to a data acquisition system, and non-uniformity of radial temperature distribution in the particle bed.
Activity measurement of high-temperature calcination reaction product: the consumption of carbonate and the product generation amount in the carbonate calcining process can be converted by measuring the weight of the experimental sections before and after the experiment; hydrating a certain amount of product sample, neutralizing hydroxide generated in the product hydration process by using hydrochloric acid with a certain concentration, accurately recording the consumption of the hydrochloric acid when the time is just 10min, and expressing the activity of the product by the milliliter number of the hydrochloric acid consumed in 10 min.
Compared with the prior art, the invention has the beneficial effects that:
1. the simulation experiment device and the test method for the high-temperature calcination reaction of the moving bed can research the reaction characteristics of the high-temperature calcination process under the carbon dioxide atmosphere and make up the defects that the existing research only aims at the air atmosphere and is simplified into a fixed bed;
2. the simulation experiment device and the test method for the high-temperature calcination reaction of the moving bed have the advantages that the highest temperature can reach 1200K, the range of experimental research is widened, and the high-temperature calcination reaction characteristics of different carbonates in the carbon dioxide atmosphere can be researched.
3. The simulation experiment device and the test method for the high-temperature calcination reaction of the moving bed can research the influence of the heating rate, the carbon dioxide atmosphere pressure, the particle size and the porosity of the particle bed on the high-temperature calcination reaction process.
4. The invention relates to a simulation experiment device and a test method for high-temperature calcination reaction of a moving bed, which can be used for researching a high-temperature calcination reaction experiment system and an experiment method of a granular bed in an alternating heating mode in the axial direction.
5. According to the simulation experiment device and the test method for the high-temperature calcination reaction of the moving bed, the used circulating working medium is the product of the high-temperature calcination reaction, so that the resource recycling of the product can be realized, and the simulation experiment device and the test method are environment-friendly and pollution-free.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
Embodiments of the invention are further illustrated by the following figures and examples:
referring to fig. 1, the apparatus of the present invention comprises an experimental section 1, a heating system wrapping the experimental section 1, a horizontal movement system, and a data acquisition control system 8.
The heating system comprises a plurality of annular heating furnaces connected with the control cabinet, 6 heating furnaces are selected in the figure, and the number of the heating furnaces is respectively a first heating furnace 2, a second heating furnace 3, a third heating furnace 4, a fourth heating furnace 5, a fifth heating furnace 6 and a sixth heating furnace 7. Each annular heating furnace wraps one section of the experiment section 1 in sequence, a radial space exists between each annular heating furnace and the experiment section 1, and each annular heating furnace can move horizontally through the radial space. The heating system heats the current wrapped part, so that the temperature of the heated part dynamically changes in the axial direction of the experimental section 1.
The horizontal moving system comprises a guide rail 9 connected with the control cabinet and a pulley 10 of the heating system, the heating system moves axially along the experimental section 1 by controlling the moving direction and speed of the heating system, the part of the experimental section 1, which is wrapped by the heating system, changes along with the movement, and the calcination reaction is carried out at the set heating temperature.
The test method of the invention is as follows:
1) controlling the heating power of the experimental section:
the data acquisition control system 8 adjusts the power of each heating furnace through the control cabinet according to the temperature data set by the experimental content, so that the temperature of the carbon dioxide at the outlet of the heating system reaches a set value;
2) controlling the lifting of the heating furnace:
the movement speed of the heating furnace on the slide rail 9 is controlled by the horizontal movement system, the rotation speed of a motor of the horizontal movement system is adjusted, the connecting rod mechanism is driven to move, the heating furnace moves horizontally, and the wrapped part of the experimental section 1 is subjected to calcination reaction at the temperature of the heating furnace.
3) Measurement of internal temperature distribution in experimental section
Reading the data of the temperature sensors at different radial positions in the experimental section 1 through a data acquisition control system 8 to obtain the non-uniform distribution of the temperature in the calcining reaction process;
4) high temperature calcination reaction product activity and yield measurements
The consumption of carbonate and the product generation amount in the carbonate calcining process can be converted by measuring the weight of the experimental sections before and after the experiment; hydrating a certain amount of product sample, neutralizing hydroxide generated in the product hydration process by using hydrochloric acid with a certain concentration, accurately recording the consumption of the hydrochloric acid when the time is just 10min, and expressing the activity of the product by the milliliter number of the hydrochloric acid consumed in 10 min.
Referring to fig. 1, when a high-temperature calcination reaction performance test needs to be performed on carbonate particles in a carbon dioxide atmosphere with a certain concentration, in an experimental section assembly stage, according to test contents, required carbonate particles are filled in an experimental section 1, a certain number of temperature sensors are arranged in the experimental section, and the experimental section 1 is connected with other systems, so that no leakage of each interface is ensured.
Before the experiment begins, as shown in figure 1, carbon dioxide with a certain concentration is filled in an experimental section until a set value is reached; and then, adjusting the power of the heating furnace six 7, the heating furnace five 6 and the heating furnace four 5 to be continuously increased by adjusting a control cabinet of the heating system to realize the preheating effect, adjusting the power of the heating furnace one 2, the heating furnace two 3 and the heating furnace three 4 to be dynamically changed in the axial direction (such as square wave or sine wave change), and starting to perform the calcination reaction characteristic test of the experimental section 1.
After the reactants in the experimental section completely react, further performance test is carried out if necessary, and the next performance test can be carried out by adjusting the concentration of carbon dioxide in the experimental section and the structure of the granular bed and repeating the steps.
The high-temperature calcination reaction characteristics of the carbonate under different working conditions and structural parameters can be evaluated by testing the calcination reaction characteristics of experimental sections filled with different carbonate particles, different particle diameters and different porosities at different horizontal movement speeds and heating modes.
Claims (4)
1. A simulation experiment device for moving bed high-temperature calcination reaction is characterized by comprising:
the experimental section (1) is of a bed layer structure filled with carbonate particles, is cylindrical and horizontally arranged, and carries out particle bed calcination reaction in the experimental section;
heating system, parcel experiment section (1) wherein one section and with experiment section (1) between have radial space, heat the part of current parcel, make the temperature of heated part change in the axial of experiment section (1), heating system includes a plurality of annular heating furnace that link to each other with the switch board, each annular heating furnace wraps up in proper order experiment section (1) in wherein one section, and with experiment section (1) between have radial space, change in the axial takes place: according to the installation sequence, the power of each annular heating furnace is changed in a square wave or sine wave manner;
the horizontal moving system controls the heating system to move axially along the experimental section (1) so that the part of the experimental section (1) wrapped by the heating system changes along with the axial movement; the horizontal moving system comprises a guide rail (9) connected with the control cabinet and a pulley (10) of the heating system, the current wrapped part of the experimental section (1) is changed by controlling the moving direction and speed of the heating system, and the calcination reaction is carried out at the set heating temperature;
the data acquisition control system (8) is used for acquiring temperature data of different axial and radial positions in the experimental section (1) to obtain non-uniform distribution of temperature in the calcining reaction process; the weight of the experimental section (1) before and after the experiment is measured, and the generation amount of the carbonate calcination decomposition product is calculated; the activity of the product is converted according to the consumption of the hydrochloric acid under a certain time by hydrating the decomposition product and adding the hydrochloric acid with a certain concentration.
2. Simulation test unit for moving bed high-temperature calcination reactions according to claim 1, characterized in that temperature sensors are arranged at different axial and radial positions inside the test section (1).
3. The simulation experiment device for the moving bed high-temperature calcination reaction according to claim 1, wherein the atmosphere of the high-temperature calcination reaction in the experiment section (1) is a carbon dioxide atmosphere.
4. A test method based on the moving bed high-temperature calcination reaction simulation experiment device of any one of claims l to 3, which is characterized by comprising the following steps:
1) controlling the heating power of the experimental section:
the data acquisition control system (8) reads temperature information set by experimental contents, adjusts the power of each heating system, enables the temperature of the carbon dioxide heated by the heating systems to reach a set value, and enables the temperature to change in the axial direction of the experimental section (1);
2) horizontal movement control:
controlling the movement speed of a heating system through a horizontal moving system to enable the experimental section (1) to carry out calcination reaction at a set temperature;
3) measurement of internal temperature distribution in experimental section
Reading temperature data of different axial and radial positions in the experimental section (1) through a data acquisition control system (8) to obtain non-uniform distribution of temperature in the calcining reaction process;
4) activity measurement of high-temperature calcination reaction product
The weight of the experimental section (1) before and after the experiment is measured, and the generation amount of the carbonate calcination decomposition product is calculated; the activity of the product is converted according to the consumption of the hydrochloric acid under a certain time by hydrating the decomposition product and adding the hydrochloric acid with a certain concentration.
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| CA2196841C (en) * | 1997-02-05 | 2001-04-03 | Christian Roy | Horizontal moving and stirred bed reactor |
| JP3567852B2 (en) * | 2000-04-21 | 2004-09-22 | 住友金属工業株式会社 | Rotary kiln |
| CN201607355U (en) * | 2010-01-26 | 2010-10-13 | 宝山钢铁股份有限公司 | Oxidization and heat treatment simulation test device in controllable atmosphere or vacuum environment |
| CN202757438U (en) * | 2012-08-13 | 2013-02-27 | 合肥荣业新材料设备有限公司 | Double tube removable cryogenic vacuum atmosphere tube furnace |
| CN103486849B (en) * | 2013-09-06 | 2015-11-18 | 内蒙古工业大学 | A kind of variable-atmosphere burning clinker of cement rotary kiln testing equipment |
| CN104931376B (en) * | 2015-04-30 | 2017-10-13 | 菏泽学院 | High-temp solid powder adheres to the test device and method of testing of wall built-up characteristic |
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| CN107213853A (en) * | 2016-03-22 | 2017-09-29 | 河南永大化工有限公司 | A kind of laboratory multistage insulation fixed bed reactor |
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