Preparation device of dry quenching coal slag adsorbent for CO2 adsorption

Abstract

The utility model discloses a preparation device of a dry quenching coal slag adsorbent for CO2 adsorption, which relates to the technical field of carbon dioxide adsorbent preparation equipment and comprises an ammonification tower, a filtering device, a reaction washing device, a granulation forming device and a drying device which are sequentially connected from front to back, the ammonification tower comprises a water vapor outlet in the top, an ammonification reaction part in the middle and an ammonification coal slag outlet in the bottom from top to bottom, and the water vapor outlet is connected with a wastewater storage tank; the ammoniation reaction part comprises a plurality of slope-shaped ammoniation steps which are arranged from top to bottom, the topmost ends of the ammoniation steps are connected with dry quenching coal slag inlets, each ammoniation step consists of an ammoniation table top and ammonia water pipes, one ammonia water pipe is arranged between every two ammoniation table tops, and the ammonia water pipes are communicated with the ammoniation table tops. The ammonia water pipe is provided with a plurality of ammoniation nozzles for spraying ammonia water to the ammoniation table top, an ammonia water inlet of the ammonia water pipe is fixed on a shell of the ammoniation tower, and the ammonia water inlet is connected with an external ammonia water pipeline; and the ammoniated coal slag outlet is connected with the filtering device.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide adsorbent preparation equipment, in particular to a preparation device for a dry quenching coal slag adsorbent used for CO2 adsorption. Background Art

[0002] The current CO2 capture and storage technology is mainly adsorption technology. Accordingly, the research and development of CO2 adsorbents has received much attention. How to further ensure the adsorption effect and desorption effect of the adsorbent is the key and difficulty of the research and development of CO2 adsorbents. At the same time, given the large demand for CO2 adsorbents, whether the preparation of CO2 adsorbents can be scaled up with low energy consumption and low cost is also the key and difficulty of the research and development of CO2 adsorbents. Utility Model Content

[0003] The utility model aims to provide a preparation device of a dry quenching coal slag adsorbent for CO2 adsorption, which is used to solve the technical problems of complex preparation process and high preparation energy consumption in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A preparation device for a dry quenched coke slag adsorbent for CO2 adsorption comprises an ammoniation tower, a filtering device, a reaction and washing device, a granulation and molding device, and a drying device connected in sequence from front to back. The ammoniation tower comprises a water vapor outlet at the top, an ammoniation reaction part in the middle, and an ammoniation coal slag outlet at the bottom from top to bottom, and the water vapor outlet is connected to a wastewater storage tank; the ammoniation reaction part comprises a plurality of sloped ammoniation steps arranged from top to bottom, and the top of the ammoniation steps is connected to a dry quenched coke slag inlet, the ammoniation steps are composed of an ammoniation table and an ammonia water pipe, an ammonia water pipe is arranged between every two ammoniation tables, and the ammonia water pipe is provided with a plurality of ammoniation nozzles for spraying ammonia water to the ammoniation table, the ammonia water inlet of the ammonia water pipe is fixed on the shell of the ammoniation tower, and the ammonia water inlet is connected to an external ammonia water pipeline; the ammonia coal slag outlet is connected to the filtering device.

[0006] The CDQ coal slag enters the ammoniation tower from the CDQ coal slag inlet. The high-temperature coal slag slides down the steps in the reactor, and contacts and reacts with the ammonia water sprayed from the ammonia water pipes between different steps, and cools the high-temperature coal slag. The cooled coal slag is filtered, and then the ammoniation coal slag is transferred to the propanol solution of aluminum isopropoxide, washed, filtered and granulated, and finally the adsorbent is dried. The whole device realizes the temperature-graded ammoniation of the high-temperature CDQ coal slag, and the obtained adsorbent product has good CO2 adsorption and desorption effects.

[0007] Preferably, a heat exchanger is further included between the water vapor outlet and the wastewater storage tank, the heat exchanger includes a tube side and a shell side, the inlet of the tube side is connected to the water vapor outlet at the top of the ammonia tower, the outlet of the tube side is connected to the wastewater storage tank, and both ends of the shell side are connected to the drying device. This scheme achieves the purpose of fully recycling and utilizing the waste heat of dry quenching coal slag and coal powder for adsorbent production, which helps to save energy and reduce emissions in the entire production process. At the same time, with the help of the heat exchanger, a large amount of water vapor is condensed into water, reducing the emission of waste gas.

[0008] Preferably, the filtrate outlet of the filtration device is connected to the ammonia water inlet through a pipeline with a valve. This arrangement is conducive to achieving full utilization of ammonia water.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] The preparation device provided by the utility model realizes the temperature-graded ammoniation of high-temperature dry quenching coal slag, which is conducive to fully utilizing the waste heat of the high-temperature dry quenching coal slag, and the prepared adsorbent has good CO2 adsorption and desorption effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the preparation process of Example 1;

[0012] Figure 2 The figure is a schematic diagram of the appearance structure of the ammonia tower;

[0013] Figure 3 It is a schematic diagram of a partial cross-sectional structure of an ammoniaizing tower;

[0014] Figure 4 It is an enlarged schematic diagram of the amination step portion of the amination tower;

[0015] Figure 5 It is a partially enlarged schematic diagram of the appearance of the ammonia tower;

[0016] Figure 6 It is the working principle schematic diagram of the ammonia tower;

[0017] Figure 7 This is a comparison chart of the adsorption capacity of adsorbents prepared with different ammonia concentrations at the same temperature (35°C) and pressure (1atm);

[0018] Figure 8 This is a comparison chart of the adsorption capacity of adsorbents prepared with different ammoniation times at the same temperature (35°C) and gas pressure (1atm).

[0019] Fig. 9 Comparison of gas pressure and adsorption capacity of adsorbents prepared by different carbon sources and preparation methods at the same temperature (35°C);

[0020] Fig.10 The temperature-desorption amount comparison diagram of adsorbents prepared by different carbon sources and preparation methods at the same gas pressure (1atm);

[0021] Figures 2 to 5 The numbers in the figure are: 1. water vapor outlet; 2. ammoniating reaction section; 2-1. ammoniating step; 2-2. ammoniating table; 2-3. ammonia water pipe; 2-3-1. ammoniating nozzle; 2-3-2. ammonia water inlet; 3. ammoniating coal slag outlet; 4. CDQ coal slag inlet. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with various embodiments and drawings. The implementation of the present invention includes but is not limited to the following embodiments.

[0023] Throughout the specification, unless otherwise specified, the terms used herein should be understood as the meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the utility model belongs. In the event of a conflict, this specification takes precedence.

[0024] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0025] Example 1

[0026] like Figure 1 As shown in the figure, it is a schematic diagram of the preparation process of CO2 adsorbent in this embodiment. Figures 2 to 6As shown in the structure of the ammoniation tower, it can be seen that the preparation device used in this embodiment includes an ammoniation tower, a filtering device, a reaction washing device, a granulation molding device, and a drying device connected in sequence from front to back. The ammoniation tower includes a water vapor outlet 1 at the top, an ammoniation reaction part 2 in the middle, and an ammoniation coal slag outlet 3 at the bottom from top to bottom. The water vapor outlet 1 is connected to a wastewater storage tank; the ammoniation reaction part 2 includes a plurality of sloped ammoniation steps 2-1 arranged from top to bottom, and the top of the ammoniation step 2-1 is The ammonia step 2-1 is connected to the dry quenching coal slag inlet 4, and the ammonia step 2-1 is composed of an ammonia table 2-2 and an ammonia pipe 2-3. An ammonia pipe 2-3 is arranged between every two ammonia tables 2-2. The ammonia pipe 2-3 is provided with a plurality of ammonia nozzles 2-3-1 for spraying ammonia water to the ammonia table 2-2. The ammonia inlet 2-3-2 of the ammonia pipe 2-3 is fixed on the shell of the ammonia tower, and the ammonia inlet 2-3-2 is connected to an external ammonia pipeline; the ammonia coal slag outlet 3 is connected to the filtering device. In addition, the preparation device of this embodiment also includes a heat exchanger arranged between the water vapor outlet 1 and the wastewater storage tank, the heat exchanger includes a tube side and a shell side, the inlet of the tube side is connected to the water vapor outlet 1 at the top of the ammonia tower, the outlet of the tube side is connected to the wastewater storage tank, and the two ends of the shell side are connected to the drying device. In order to make full use of ammonia water, the filtrate outlet of the filtering device is connected to the ammonia inlet through a pipeline with a valve. The filtering device, reaction washing device, granulation forming device, and drying device of this embodiment are all common devices available on the market. As long as they can achieve the corresponding functions, they will not be described in detail here.

[0027] The specific process of producing the adsorbent in this embodiment is described as follows: CDQ slag at 600-700°C is taken, and the CDQ slag is loaded into the uppermost ammoniation step 2-1 in the ammoniation reaction part 2 from the CDQ slag inlet 4 of the ammoniation tower, and rolled down with the help of the slope, while ammonia water enters the ammonia water pipe 2-3 through the ammonia water inlet 2-3-2, and is sprayed onto the CDQ slag that has turned over on the ammoniation step 2-1 through the ammoniation nozzle 2-3-1, cooling the CDQ slag while ammoniating the CDQ slag. In this process, ammonia water and the high-temperature CDQ slag are reacted with each other. The hot steam generated by the contact with the coal slag is discharged from the water vapor outlet 1, cooled by the heat exchanger, and then enters the wastewater storage tank; the ammoniation of the dry quenching coal slag rolls all the way down to the ammoniation coal slag outlet 3, and is transferred to the filtering device after the ammoniation of the dry quenching coal slag is cooled; the ammoniation of the dry quenching coal slag is filtered, the filtered ammonia water is collected, and the one that meets the production conditions is returned to the ammonia water inlet 2-3-2, and the filtered residue is transferred to the reaction washing device filled with 1mol / L aluminum isopropoxide propanol solution, and stirred for 15min at 600r / min. The obtained reaction system is filtered, and the filtrate is transferred to the wastewater storage tank, and the filter residue is washed with propanol and water for 3 times, and the washing liquid after washing is transferred to the wastewater storage tank. After washing, the filter residue is granulated and dried with gas heated by the heat exchanger, and the dry quenching coal slag adsorbent for CO2 adsorption can be obtained.

[0028] The testing process of the prepared adsorbent is as follows: it is obtained through the American Micromeritics ASAP 2020 test. Before conducting the gas adsorption experiment, about 100 mg of the sample must be degassed at 150°C in a degassing station for 24 hours in vacuum. After the degassing is completed and weighed, it is transferred to the ASAP2020 adsorption instrument analysis station for a gas static adsorption test, and the adsorption amount (ml / g) is calculated according to the weight increase of the adsorbent; a desorption experiment is carried out, and the adsorbent to be desorbed that is sufficient under certain conditions is desorbed at different temperatures and pressures, and the desorption amount (ml / g) is calculated according to the weight loss of the adsorbent.

[0029] Experimental Example Process 1: In order to explore the effect of different ammonia concentrations on adsorption performance, according to the specific process of producing the adsorbent mentioned above, ammonia of different concentrations was used for ammoniaization, such as Figure 7 As shown, it is a comparison chart of the adsorption amount of adsorbents prepared with different ammonia concentrations at the same temperature (35°C) and air pressure (1atm). When the ammonia concentration is 15%, the adsorption activity of the adsorbent reaches the maximum.

[0030] Experimental Example 2: In order to explore the effect of different ammoniation times on adsorption performance, according to the specific process of producing the adsorbent mentioned above, different ammoniation times were used for ammoniation, such as Figure 8 As shown, it is a comparison chart of the adsorption amount of adsorbents prepared with different ammoniation times at the same temperature (35°C) and gas pressure (1atm). When the ammoniation time is 12 minutes, the adsorption activity of the adsorbent reaches the maximum.

[0031] Experimental Example 3: In order to explore the effects of temperature and carbon source on adsorption and desorption performance during the preparation process, the experimental samples were set up as follows:

[0032] (1) The ammonia concentration was 15%, the ammoniation time was 12 minutes, and adsorbent C-1 was prepared according to the above-mentioned specific process for producing the adsorbent;

[0033] (2) The concentration of ammonia water was 15%, the ammoniation time was 12 minutes, the CDQ coal slag was replaced with commercial activated carbon (Aladdin reagent CAS No. 7440-44-0), and the commercial activated carbon was heated to 700° C. under a nitrogen atmosphere. Adsorbent C-2 was obtained according to the above-mentioned specific process for producing the adsorbent.

[0034] (3) The concentration of ammonia water is 15%, and the ammoniation time is 12 minutes. The cooled dry quenched coke slag is soaked in ammonia water for 12 minutes, and then transferred to a propanol solution containing aluminum isopropoxide and stirred at 600 r / min for 15 minutes. Finally, the precipitate is filtered, washed with water for 3 times, granulated and dried to obtain adsorbent C-3.

[0035] (4) The concentration of ammonia water is 15%, and the ammoniation time is 12 minutes. The commercial activated carbon is soaked in ammonia water for 12 minutes, and then transferred to a propanol solution containing aluminum isopropoxide and stirred at 600 r / min for 15 minutes. Finally, the precipitate is filtered, washed with water three times, granulated, and dried to obtain adsorbent C-4.

[0036] (5) The ammonia concentration is 15% and the ammoniation time is 12 minutes. The ammoniation tower in the above device is replaced with a common leaching reaction device, and adsorbent C-5 is prepared according to the above specific process for producing the adsorbent.

[0037] (6) The concentration of ammonia water is 15%, the ammoniation time is 12 minutes, the CDQ coal slag is replaced with commercial activated carbon, and the commercial activated carbon is heated to 700° C. under a nitrogen atmosphere, and the ammoniation tower in the above device is replaced with a common leaching reaction device. Adsorbent C-6 is obtained according to the above specific process for producing the adsorbent.

[0038] The pressure-adsorption amount comparison diagram of the adsorbents prepared by different carbon sources and preparation methods at the same temperature (35°C) and the temperature-desorption amount comparison diagram at the same pressure (1atm) are shown as follows: Fig. 9 and Fig.10 As shown. It is not difficult to see that the C-1 adsorbent prepared using coal slag has a stronger adsorption capacity for CO2, and realizes waste utilization and reduces the cost of coal slag treatment. Using different water vapor temperatures, the C-1 and C-2 adsorbents that have adsorbed CO2 were purged for 12 minutes, and the desorption effects of the six catalysts at different temperatures were compared. Under 120°C water vapor purge, the six catalysts were able to completely remove the adsorbed CO2, indicating that the adsorbent prepared in this application has improved CO2 adsorption performance and the desorption performance has not decreased. In addition, by comparing the C-5 adsorbent and the C-6 adsorbent, it can be seen that the amination tower provided in this embodiment is not only conducive to the centralized treatment of waste gas and the reduction of waste gas emissions, but also plays a positive role in the adsorption performance of the adsorbent. This may be based on the step-by-step reduction of the amination reaction temperature in the amination tower and the full contact between coal slag and ammonia.

[0039] The above embodiment is only one of the preferred implementation modes of the present utility model and should not be used to limit the protection scope of the present utility model. Any changes or modifications that are made to the main design concept and spirit of the present utility model without any substantive significance, as long as the technical problems solved are still consistent with the present utility model, should be included in the protection scope of the present utility model.

Claims

1. A preparation device for dry quenching coal slag adsorbent for CO2 adsorption, characterized in that: The invention comprises an ammoniation tower, a filtering device, a reaction and washing device, a granulation and forming device, and a drying device which are connected in sequence from front to back. The ammoniation tower comprises a water vapor outlet at the top, an ammoniation reaction part in the middle, and an ammoniation coal slag outlet at the bottom from top to bottom, and the water vapor outlet is connected to a wastewater storage tank; the ammoniation reaction part comprises a plurality of sloped ammoniation steps arranged from top to bottom, and the top of the ammoniation steps is connected to a dry quenching coal slag inlet, the ammoniation steps are composed of an ammoniation table and an ammonia water pipe, an ammonia water pipe is arranged between every two ammoniation tables, and a plurality of ammoniation nozzles for spraying ammonia water to the ammoniation table are arranged on the ammonia water pipe, the ammonia water inlet of the ammonia water pipe is fixed on the shell of the ammoniation tower, and the ammonia water inlet is connected to an external ammonia water pipeline; the ammonia coal slag outlet is connected to the filtering device.

2. The preparation device according to claim 1, characterized in that: It also includes a heat exchanger arranged between the water vapor outlet and the wastewater storage tank, the heat exchanger includes a tube side and a shell side, the inlet of the tube side is connected to the water vapor outlet at the top of the amination tower, the outlet of the tube side is connected to the wastewater storage tank, and both ends of the shell side are connected to the drying device.

3. The preparation device according to claim 2, characterized in that: The filtrate outlet of the filtering device is connected to the ammonia water inlet through a pipeline with a valve.

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