Carbon dioxide absorbing and curing system

Abstract

The utility model discloses a carbon dioxide absorption and solidification system which comprises a reaction device for absorbing and solidifying carbon dioxide to generate a solid-liquid mixture, and a separation device for separating carbon condensate and first mother liquor from the solid-liquid mixture, the separating device is used for separating out a first solid compound from the separated first mother liquor by using a second solid compound and generating second mother liquor, and the feeding device is used for conveying the supersaturated chlorine and the sodium solution to the reaction device and conveying the second solid compound to the separating device. The whole carbon dioxide absorption and solidification system only produces the carbon condensate and the solid product of the first solid compound, and the rest of the second solid compound and the second mother liquor which are used as media can be automatically recycled, so that the operation efficiency of the system is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of low-carbon environmental protection, in particular to a carbon dioxide absorption and solidification system. Background Art

[0002] In the face of global warming, green and low-carbon technologies such as emission reduction, recycling, utilization and storage of carbon dioxide, the main cause of the enhanced greenhouse effect of the atmosphere, have attracted much attention.

[0003] At present, with the development of carbon dioxide capture technology, there is also a lot of recycled and purified carbon dioxide that can be used.

[0004] One of the application scenarios of carbon dioxide is the combined alkali production process, which can not only absorb carbon dioxide and solidify it as an alkali, but also produce sodium bicarbonate, which can be calcined to produce alkali, and its byproduct ammonium chloride can be used as agricultural fertilizer. Therefore, this process can be used to consume purified carbon dioxide while producing applicable compounds.

[0005] However, the combined alkali production process also uses raw materials, including sodium chloride in the sodium bicarbonate production process and ammonium chloride crystallization process. Moreover, when the main purpose is to solidify carbon dioxide, the traditional combined alkali production system has insufficient internal connectivity and low overall cost performance.

[0006] Therefore, when the combined alkali production system is applied to the application of carbon fixation for the purpose of carbon dioxide consumption, there is a demand for an efficient automation system with simpler connectivity within the system. Utility Model Content

[0007] The utility model provides a carbon dioxide absorption and solidification system, which improves the system operation efficiency when carbon is fixed by utilizing a combined alkali making system.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A carbon dioxide absorption and solidification system, comprising a reaction device for absorbing and solidifying carbon dioxide to produce a solid-liquid mixture;

[0010] A separation device for separating carbon solids and a first mother liquid from a solid-liquid mixture;

[0011] A precipitation device for precipitating the first solid compound with the second solid compound in the separated first mother liquid to generate a second mother liquid;

[0012] The supersaturated chlorine and sodium solution is transported to the reaction device, and the second solid compound is transported to the feeding device of the precipitation device.

[0013] Compared with the prior art, the carbon dioxide absorption and solidification system of this case can use seawater as a supply source for generating supersaturated chlorine and sodium solutions for absorption reactions and second solid compounds for precipitation, and at the same time mix the second mother liquor exchanged after precipitation with seawater for use, so that the entire carbon dioxide absorption and solidification system only produces solid products of carbon solids and the first solid compound, and the remaining second solid compounds and second mother liquor used as media can be automatically recycled, effectively improving the system operation efficiency.

[0014] In one embodiment, the reaction device includes a reaction kettle with a stirrer as a carbon dioxide absorption reaction chamber;

[0015] A carbon dioxide storage tank for delivering carbon dioxide to the reactor;

[0016] A liquid ammonia storage tank for delivering liquid ammonia to the reactor;

[0017] A brine pool connected to a feed device and into which supersaturated chlorine and sodium solutions are input and transported to the reactor.

[0018] In order to prevent the potential safety hazard caused by leakage of ammonia in the reactor, the reaction device in some embodiments further includes a pressure relief device, which includes a pressure relief valve and a sodium bisulfate solution tank for neutralizing the released ammonia.

[0019] In one embodiment, in order to make ammonia gas dissolve in water earlier, the reaction device also includes a Bernoulli device for fusing the supersaturated chlorine and sodium solution and liquid ammonia in advance before being transported to the reaction kettle.

[0020] Utilizing Bernoulli's principle, in some embodiments, the salt water pool is a cylindrical pool with an outlet for supersaturated chlorine and sodium solutions disposed at the bottom.

[0021] In one embodiment, the separation device includes a first filter press and a first solid collection tank for recovering carbon solids.

[0022] In one embodiment, the precipitation device includes a mixed liquid storage tank as a precipitation chamber, a condenser built in the mixed liquid storage tank, a second filter press for filtering out the first solid compound, and a second solid collection tank for recovering the first solid compound.

[0023] In one embodiment, the condenser of the mixed liquid storage tank is a water-cooled condenser.

[0024] In one embodiment, the feeding device is a salt field. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a carbon dioxide absorption and solidification system in this case. DETAILED DESCRIPTION

[0026] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0027] Please refer to Figure 1 This case is a system for absorbing and solidifying carbon dioxide with reference to the combined alkali production process. The process of absorbing and solidifying carbon dioxide and producing a solid-liquid mixture is carried out in the reaction device 100. Specifically, the main reaction facility of the reaction device 100 is a reactor 110 with an agitator 111. The reactor 110 serves as a reaction chamber for absorbing and solidifying carbon dioxide, and receives carbon dioxide from a carbon dioxide storage tank 120, liquid ammonia from a liquid ammonia storage tank 130, and saturated chlorine and sodium solutions from a brine pool 140.

[0028] Specifically, the reaction formula in the reactor 110 is:

[0029] Sodium chloride + ammonia + carbon dioxide = = sodium bicarbonate (precipitate) + ammonium chloride

[0030] NaCl+NH3·H2O+CO2=NaHCO3↓+NH4Cl

[0031] More specifically, the detailed reaction equation is

[0032] 1. NH3·H2O+CO2=NH4HCO3

[0033] 2. NH4HCO3+NaCl=NaHCO3↓+NH4Cl

[0034] Ammonia water reacts with carbon dioxide to generate one molecule of ammonium bicarbonate, and ammonium bicarbonate reacts with sodium chloride to generate one molecule of ammonium chloride and sodium bicarbonate precipitate. For the convenience of explanation, in this case, the generated sodium bicarbonate precipitate and ammonium chloride solution are collectively referred to as a solid-liquid mixture.

[0035] Here, it is worth noting that ammonia has a greater solubility, which means that more ammonia can be dissolved in water. Ammonia dissolves to form ammonia water, which is alkaline. An alkaline environment is conducive to the absorption of carbon dioxide because carbon dioxide reacts with ammonia water to form ammonium bicarbonate instead of directly existing in the form of sodium bicarbonate. The solubility of ammonium bicarbonate is greater than that of sodium bicarbonate, which means that under the same conditions, more carbon dioxide can be absorbed.

[0036] Therefore, in order to make the ammonia gas dissolve in water earlier, preferably, the reaction device 100 further includes a Bernoulli device 150 for fusing the supersaturated chlorine and sodium solution with the liquid ammonia before being transported to the reactor 110. Specifically, the diameter of the transport pipe of the supersaturated chlorine and sodium solution coming out of the salt water pool 140 becomes smaller at the connection with the output pipe of the liquid ammonia storage tank 130 to increase the liquid pressure. Here, the mixed solution after fusing with the liquid ammonia is put into the reactor 110.

[0037] At this time, the Bernoulli principle can be used to configure the salt water pool 140 into a cylindrical pool in some embodiments, and the outlet of the supersaturated chlorine and sodium solution is arranged at the bottom. In this way, the weight in the pool itself can be used to provide sufficient liquid supply pressure.

[0038] As described above, the raw material delivery and reaction process of the entire reactor 110 are operated under pressure, so in order to prevent the hidden dangers caused by the leakage of ammonia in the reactor 110, a pressure relief device can be added to the reaction device 100 in some embodiments. The pressure relief device can be a pressure relief valve 161 connected to the reactor 110 and a sodium bisulfate solution tank 160 that neutralizes the argon released from the pressure relief valve 161. The sodium bisulfate solution tank 160 can also be provided with an anti-overflow port 162.

[0039] Specifically, the reaction formula is

[0040] 2NaHSO4+2NH3·H2O=(NH4)2SO4+Na2SO4+2H2O

[0041] In this reaction, sodium bisulfate (NaHSO4) is an acidic solution, while ammonia (NH3·H2O) is an alkaline solution. When the two solutions are mixed together, the acidic and alkaline properties cancel each other out, producing a neutral substance.

[0042] The solid-liquid mixture generated by the reaction in the reactor 110 is separated into a carbon solid and a first mother liquid by the separation device 200. Here, the carbon solid is sodium bicarbonate solid, and the first mother liquid is mainly ammonium chloride (NH4Cl) solution.

[0043] In practical applications, the optional separation device 200 may specifically be a first filter press 210 and a first solid collection tank 220 for recovering carbon solids. The solid-liquid mixture first passes through the first filter press 210, the generated carbon solids are stored in the first solid collection tank 220, and the filtered first mother liquid flows to the precipitation device 300.

[0044] In one embodiment, the precipitation device 300 may include a mixed liquid storage tank 310 as a precipitation chamber and a condenser 320 built in the mixed liquid storage tank 310. Here, the condenser 320 is preferably a water-cooled condenser. At the same time, the mixed liquid storage tank 310 is also provided with a second solid compound input port, where the second solid compound is sodium chloride (NaCl). The second solid compound input port can be set at the upper end or at the lower end in a drawer shape to achieve the effect of inputting soluble solids, which will not be described here.

[0045] In the first mother liquid, the solubility of the main component NH4Cl is greater than that of NaCl at room temperature, but less than that of NaCl at low temperature. Using this principle, the second solid compound, sodium chloride (NaCl), can be used to precipitate the first solid compound, ammonium chloride (NH4Cl), at 278K~283K (5℃~10℃).

[0046] The precipitation device 300 may further include a second filter press 330 for filtering out the first solid compound, that is, ammonium chloride (NH4Cl), from the mixed solution after the precipitation is completed. The first solid compound produced after filtering by the second filter press 330 is stored in the second solid collection tank 340. Meanwhile, the second mother liquor produced at the same time is recovered to the feeding device 400. Here, the second mother liquor is mainly the precipitated sodium chloride (NaCl) solution.

[0047] The application of the feeding device 400 is also the main invention of this case. Preferably, the feeding device 400 can be a salt field that uses seawater. In this way, the recovered second mother liquor can be mixed with seawater, because the recovered second mother liquor itself is a sodium chloride (NaCl) solution, which can be directly recycled and reused without special treatment of the by-products of this system.

[0048] Furthermore, after mixing with seawater, the salt is dried to generate a supersaturated chlorine and sodium solution and a second solid compound, namely sodium chloride (NaCl). The supersaturated chlorine and sodium solution generated here is transported to the salt water pool 140 to enter the next cycle, and the second solid compound is put into the mixed liquid storage tank 310 to enter the next round of the second mother liquid cycle. Here, the second solid compound can be put into the mixed liquid storage tank 310 by automatic suction through a pipeline, or by a timed movement of the accumulated quantity, both of which can achieve the effect of putting the second solid compound from the second solid compound input port of the mixed liquid storage tank 310, which will not be described here. Such an automatic circulation system effectively improves the system operation efficiency.

[0049] As mentioned above, this case protects a carbon dioxide absorption and solidification system, and all technical solutions that are the same or similar to this case should be deemed to fall within the scope of protection of this case.

Claims

1. A carbon dioxide absorption and curing system, characterized in that It comprises a reaction device (100) for absorbing and solidifying carbon dioxide to produce a solid-liquid mixture; A separation device (200) for separating carbon solids and a first mother liquid from the solid-liquid mixture; A precipitation device (300) for precipitating a first solid compound from the separated first mother liquid using a second solid compound to generate a second mother liquid; The supersaturated chlorine and sodium solution is transported to the reaction device (100), and the second solid compound is transported to the feeding device (400) of the precipitation device (300).

2. A carbon dioxide absorption and solidification system as claimed in claim 1, characterized in that The reaction device (100) comprises a reaction kettle (110) with a stirrer (111) as a carbon dioxide absorption reaction chamber; a carbon dioxide storage tank (120) for delivering carbon dioxide to the reactor (110); a liquid ammonia storage tank (130) for conveying liquid ammonia to the reaction kettle (110); A salt water pool (140) is connected to the feeding device (400) and is fed with supersaturated chlorine and sodium solutions from the feeding device (400) and transported to the reaction kettle (110).

3. A carbon dioxide absorption and solidification system as claimed in claim 2, characterized in that The reaction device (100) further comprises a pressure relief device, which comprises a pressure relief valve (161) and a sodium bisulfate solution tank (160) for neutralizing the ammonia gas released from the pressure relief.

4. A carbon dioxide absorption and solidification system as claimed in claim 2, characterized in that The reaction device (100) further comprises a Bernoulli device (150) for fusing the supersaturated chlorine and sodium solution and liquid ammonia in advance before being transported to the reaction kettle (110).

5. A carbon dioxide absorption and solidification system as claimed in claim 2, characterized in that The salt water pool (140) is a cylindrical pool with an outlet for supersaturated chlorine and sodium solutions arranged at the bottom.

6. A carbon dioxide absorption and solidification system as claimed in claim 1, characterized in that The separation device (200) comprises a first filter press (210) and a first solid collection tank (220) for recovering carbon solids.

7. A carbon dioxide absorption and solidification system as claimed in claim 1, characterized in that The precipitation device (300) comprises a mixed liquid storage tank (310) serving as a precipitation chamber, a condenser (320) built in the mixed liquid storage tank (310), a second filter press (330) for filtering out a first solid compound, and a second solid collection tank (340) for recovering the first solid compound.

8. A carbon dioxide absorption and solidification system as claimed in claim 7, characterized in that The condenser (320) of the mixed liquid storage tank (310) is a water-cooled condenser.

9. A carbon dioxide absorption and solidification system according to any one of claims 1 to 8, wherein the feeding device (400) is a salt drying field.

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