Energy-saving device for low-temperature decomposition of heavy alkali

Abstract

The utility model is suitable for heavy alkali processing technical field provides a kind of energy-saving device of low-temperature decomposition heavy alkali, including MEA preparation jar and reaction kettle, the bottom of MEA preparation jar is connected with the top of reaction kettle by pipeline, the top of reaction kettle is equipped with top cover, and heavy alkali feeding pipe is arranged in top cover, the inner bottom of reaction kettle is equipped with carbon dioxide aeration pipe, a plurality of aeration holes are formed in the side wall of carbon dioxide aeration pipe, and the one end of carbon dioxide aeration pipe is connected with air inlet pipe, air inlet pipe penetrates reaction kettle, and is connected with air pump, the bottom of reaction kettle is equipped with discharge pipe.The utility model provides a kind of energy-saving device of low-temperature decomposition heavy alkali, promotes sodium bicarbonate in heavy alkali to be all decomposed under lower temperature condition by utilizing the reaction of MEA and CO2, simultaneously realizes the recycling of CO2, reduces energy consumption, and saves energy.

Description

Technical Field

[0001] This utility model belongs to the field of heavy alkali processing technology, and in particular relates to an energy-saving device for low-temperature decomposition of heavy alkali. Background Technology

[0002] The calcination of heavy soda ash is the final chemical production process that transforms the heavy soda ash from the carbonization process into a purified product. Therefore, it plays a crucial role in ensuring product quality, yield, and energy consumption. The main task of the calcination process is to calcine the heavy soda ash from the filtration process in a calcining furnace to obtain the finished product, light soda ash. The light soda ash is then hydrated and calcined again to produce heavy soda ash. Simultaneously, the calcination process also requires the purification and cooling of the furnace gas generated during calcination—a mixture containing large amounts of CO2 and NH3—before sending it to the compression workshop for recycling.

[0003] The composition of heavy alkali consists of two phases: a solid phase mainly composed of NaHCO3, followed by Na2CO3 and NaCl, and a liquid phase mainly composed of free water and dissolved ammonium salts (NH4HCO3 and NH4Cl). During the indirect heating process of heavy alkali with medium-pressure steam in the calcining furnace, the following reaction occurs: 2NaHCO3=Na2CO3+CO2+H2O-128.53MJ / kmol; NH4HCO3=NH3+CO2+H2O-185.06MJ / kmol; NaHCO3+NH4Cl=NaCl+NH3+CO2+H2O-154.5MJ / kmol; As can be seen from the above reaction formula, the calcination of heavy soda ash is an endothermic process. Producing one ton of soda ash consumes approximately 2.5 GJ of heat energy, requiring about 1.8 tons of steam, which accounts for about 18% of the comparable comprehensive energy consumption per unit of soda ash. Therefore, the calcination of heavy soda ash is a major energy consumer in soda ash production, and reducing steam consumption during calcination is of great significance for clean production and energy conservation in soda ash production.

[0004] In response, this application proposes an energy-saving device for the low-temperature decomposition of heavy alkali. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving device for low-temperature decomposition of heavy alkali, so as to solve the problems in the background art mentioned above.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving device for low-temperature decomposition of heavy alkali, comprising an MEA preparation tank and a reaction vessel, wherein the bottom of the MEA preparation tank and the top of the reaction vessel are connected by a pipe, the top of the reaction vessel is provided with a top cover, through which a heavy alkali feeding pipe passes, a carbon dioxide aeration pipe is provided at the bottom of the reaction vessel, a plurality of aeration holes are opened on the side wall of the carbon dioxide aeration pipe, one end of the carbon dioxide aeration pipe is connected to an air inlet pipe, the air inlet pipe passes through the reaction vessel and is connected to an air pump, and a discharge pipe is provided at the bottom of the reaction vessel.

[0007] Preferably, a pump is connected to the pipeline between the bottom of the MEA preparation tank and the top of the reactor.

[0008] Preferably, the pipe between the bottom of the MEA preparation tank and the top of the reactor passes through the reactor and is connected to an atomizing nozzle.

[0009] Preferably, the bottom of the heavy alkali feeding pipe is provided with several inclined discharge pipes, and the several discharge pipes are distributed in a circle.

[0010] Preferably, a motor is provided on the top surface of the top cover, and a rotating shaft is provided at the output end of the motor. The rotating shaft passes through the top cover and extends into the interior of the reactor. A stirring rod is connected to the side wall of the rotating shaft inside the reactor.

[0011] Preferably, the top cover is fixed to the reactor by screws.

[0012] This utility model has at least the following beneficial effects: This invention provides an energy-saving device for the low-temperature decomposition of sodium bicarbonate. By utilizing the reaction between MEA and CO2, the sodium bicarbonate in the sodium bicarbonate is completely decomposed at a lower temperature, while CO2 is recovered and utilized, thus reducing energy consumption and saving energy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the internal structure of the reaction vessel of this utility model; Figure 2 This is a schematic diagram of the connection between the aeration pipe and the air pump of this utility model; Figure 3 This is a schematic diagram of the external structure of this utility model.

[0014] In the attached diagram, the following are the reference numerals: 1. Reactor; 2. MEA preparation tank; 3. Pump; 4. Atomizing nozzle; 5. Top cover; 6. Heavy alkali feed pipe; 7. Discharge pipe; 8. Motor; 9. Shaft; 10. Stirring rod; 11. Carbon dioxide aeration pipe; 12. Air inlet pipe; 13. Air pump; 14. Aeration hole; 15. Discharge pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. Example

[0016] Please see Figure 1 , Figure 2 and Figure 3 This utility model provides a technical solution: an energy-saving device for low-temperature decomposition of heavy alkali, including an MEA preparation tank 2 and a reaction vessel 1. Specifically, the reaction vessel 1 is equipped with a heating plate inside, which is electrically connected to a power supply and a temperature controller. The bottom of the MEA preparation tank 2 and the top of the reaction vessel 1 are connected by a pipe. The top of the reaction vessel 1 is equipped with a top cover 5. Specifically, an air outlet pipe passes through the top surface of the top cover 5, and a heavy alkali feeding pipe 6 passes through the top cover 5. A carbon dioxide aeration pipe 11 is provided at the bottom of the reaction vessel 1. Several aeration holes 14 are opened on the side wall of the carbon dioxide aeration pipe 11. One end of the carbon dioxide aeration pipe 11 is connected to an air inlet pipe 12, which passes through the reaction vessel 1 and is connected to an air pump 13. Specifically, the air inlet end of the air pump 13 is connected to the top of the reaction vessel 1 by a pipe (not shown in the figure). A discharge pipe 15 is provided at the bottom of the reaction vessel 1.

[0017] In this embodiment, MEA is prepared into an aqueous solution of a certain concentration in MEA preparation tank 2. After preparation, it is added to reaction vessel 1. Then, the heating plate is activated and the heating temperature is controlled. A certain mass ratio of heavy alkali is added through the heavy alkali feeding pipe 6. After the reaction is completed, all sodium bicarbonate in the heavy alkali is converted into sodium carbonate, ammonia, and carbon dioxide. The generated gas is pumped to the carbon dioxide aeration pipe 11 by the gas pump 13 to make it uniformly contact the mixed solution. At this time, the absorption of CO2 by MEA in reaction vessel 1 is reversible: MEA acts as a CO2 scavenger, and the absorption principle is to use the reaction of weakly alkaline amine solution with weakly acidic CO2 gas to generate water-soluble salts. The CO2 reaction process is as follows: CO2 + 2C2H5OHNH C2H5OHNCOO - +C2H5OHNH2 + ; The direction of the chemical reaction equation is controlled by temperature. At lower temperatures, the reaction moves in the forward direction, while at higher temperatures, the reaction proceeds in the reverse direction. Thus, by utilizing the reaction between MEA and CO2, the sodium bicarbonate in the heavy alkali can be completely decomposed under lower temperature conditions (≤100℃), while simultaneously achieving the recovery and utilization of CO2.

[0018] Furthermore, a pumping pump 3 is connected to the pipe between the bottom of the MEA preparation tank 2 and the top of the reactor 1. The pipe between the bottom of the MEA preparation tank 2 and the top of the reactor 1 passes through the reactor 1 and is connected to an atomizing nozzle 4.

[0019] In this embodiment, the MEA aqueous solution is pumped by the pumping pump 3 and atomized and dispersed in the reaction vessel 1 by the atomizing nozzle 4 to fully capture CO2.

[0020] Furthermore, the bottom of the heavy alkali feed pipe 6 is provided with several inclined discharge pipes 7, which are distributed in a circular pattern.

[0021] In this embodiment, the heavy alkali solution is dispersed through the discharge pipe 7 to facilitate uniform dispersion into the reaction vessel 1.

[0022] Furthermore, a motor 8 is provided on the top surface of the top cover 5. Specifically, the motor 8 is fixedly connected to the top cover 5. A rotating shaft 9 is provided at the output end of the motor 8. Specifically, the rotating shaft 9 is fixedly connected to the output end of the motor 8. The rotating shaft 9 passes through the top cover 5 and extends into the interior of the reactor 1. Specifically, the rotating shaft 9 is slidably connected to the top cover 5. A stirring rod 10 is connected to the side wall of the rotating shaft 9 inside the reactor 1. Specifically, the stirring rod 10 is fixedly connected to the rotating shaft 9.

[0023] In this embodiment, the stirring rod 10 is driven by the motor 8 to stir, thereby accelerating the reaction rate.

[0024] Furthermore, the top cover 5 is fixed to the reactor 1 with screws.

[0025] In this embodiment, the top cover 5 is fixed to the reactor 1 with screws for easy disassembly.

[0026] The working principle and usage process of this utility model: After the utility model is installed, work according to the above implementation method until all working steps are completed.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving device for low-temperature decomposition of heavy alkali, characterized in that, The reactor includes an MEA preparation tank (2) and a reaction vessel (1). The bottom of the MEA preparation tank (2) and the top of the reaction vessel (1) are connected by a pipe. The top of the reaction vessel (1) is provided with a top cover (5). The top cover (5) is provided with a heavy alkali feeding pipe (6). The bottom of the reaction vessel (1) is provided with a carbon dioxide aeration pipe (11). The side wall of the carbon dioxide aeration pipe (11) is provided with several aeration holes (14). One end of the carbon dioxide aeration pipe (11) is connected to an air inlet pipe (12). The air inlet pipe (12) passes through the reaction vessel (1) and is connected to an air pump (13). The bottom of the reaction vessel (1) is provided with a discharge pipe (15).

2. The energy saving device for low temperature decomposition of heavy alkali according to claim 1, characterized in that: A pump (3) is connected to the pipeline between the bottom of the MEA preparation tank (2) and the top of the reactor (1).

3. The energy saving device for low temperature decomposition of heavy alkali according to claim 2, characterized in that: The pipe between the bottom of the MEA preparation tank (2) and the top of the reactor (1) passes through the reactor (1) and is connected to an atomizing nozzle (4).

4. The energy saving device for low temperature decomposition of heavy alkali according to claim 3, characterized in that: The bottom of the heavy alkali feeding pipe (6) is provided with several inclined discharge pipes (7), and the several discharge pipes (7) are distributed in a circle.

5. The energy efficient apparatus for low temperature decomposition of heavy alkali according to claim 4, wherein: The top surface of the top cover (5) is provided with a motor (8), and the output end of the motor (8) is provided with a rotating shaft (9). The rotating shaft (9) passes through the top cover (5) and extends into the interior of the reactor (1). The side wall of the rotating shaft (9) is located inside the reactor (1) and is connected to a stirring rod (10).

6. The energy saving device for low temperature decomposition of heavy alkali according to claim 5, characterized in that: The top cover (5) is fixed to the reactor (1) by screws.

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