Whole-flow gas circulation device for chemical absorption

Abstract

The utility model discloses a full-flow gas circulation device for chemical absorption, which relates to the technical field of gas circulation and comprises an air compressor and a carbon dioxide steel cylinder and is used for providing carbon dioxide and air for a gas storage tank. And then air containing carbon dioxide with a certain concentration is pumped into the absorption tower from the bottom of the air storage tank through a flue gas fan. According to the utility model, the compressor and the one-way valve are arranged, so that the recovery of carbon dioxide is realized, the amount of carbon dioxide consumed in the experiment process can be reduced, the experiment cost is saved, and gas in the gas storage tank is prevented from entering the regeneration tower to influence the experiment process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas circulation technical field, especially a full-process gas circulation device for chemical absorption. BACKGROUND

[0002] Because the scale of 4-5Nm3 / h is too small in the chemical absorption research, the experiment has poor simulation to the actual industrial condition, and it is more significant to expand to 10-20Nm3 / h, but the gas source selection of 10-20Nm3 / h is a problem, and the scale is too small to be not suitable for burning oil, and the consumption of gas cylinder gas is too large, taking 10Nm3 / h as an example, 12% carbon dioxide concentration needs a 40L 20kg carbon dioxide bottle per day, and the experimental cost is high.

[0003] Therefore, it is urgent to design a full-process gas circulation device for chemical absorption, which reduces the consumption of carbon dioxide and saves the experimental cost. UTILITY MODEL CONTENT

[0004] The utility model discloses a full-process gas circulation device for chemical absorption.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme: a full-process gas circulation device for chemical absorption, which comprises: a gas storage tank, a flue gas fan, an absorption tower, a regeneration tower and a regenerated gas compressor.

[0006] The air compressor and the carbon dioxide steel bottle are connected with the gas storage tank and are used to provide carbon dioxide and air to the gas storage tank.

[0007] The flue gas fan is connected with the gas storage tank and the absorption tower and is used to pump the carbon dioxide and air in the gas storage tank into the absorption tower, and the decarburization flue gas generated in the absorption tower is conveyed into the gas storage tank through a pipeline.

[0008] The absorption tower is connected with the regeneration tower through a lean-rich liquid heat exchanger, is used to send the rich liquid from the bottom of the absorption tower into the regeneration tower through the lean-rich liquid heat exchanger, and is used to send the lean liquid from the bottom of the regeneration tower into the absorption tower through the lean-rich liquid heat exchanger.

[0009] One end of the regenerated gas compressor is connected with the regeneration tower, the other end is connected with the gas storage tank through a one-way valve, and is used to pump the carbon dioxide in the regeneration tower into the gas storage tank.

[0010] As a further technical scheme of the utility model, the top of the gas storage tank is provided with two pipelines, one is used to recover the decarburization flue gas in the absorption tower, and the other is used to recover the carbon dioxide generated in the regeneration tower.

[0011] As a further technical scheme of the utility model, the carbon dioxide sensor is installed in the pipeline, the carbon dioxide concentration in the gas storage tank and the carbon dioxide concentration change in the absorption tower are monitored in real time.

[0012] As a further technical scheme of the utility model, the PLC control system is arranged in the pipeline, is connected with the air compressor and the regenerated gas compressor, and is used for adjusting the working state of the air compressor and the regenerated gas compressor.

[0013] The utility model has the advantages of:

[0014] The device can reduce the carbon dioxide consumption in the experiment process, save the experiment cost, set the regenerated gas compressor and the check valve, realize the recovery of carbon dioxide, and avoid the influence of the gas in the gas storage tank on the experiment process. DRAWINGS

[0015] Figure 1 A full-process gas circulation device for chemical absorption is provided in the utility model.

[0016] In the drawing: 1, gas storage tank; 2, flue gas fan; 3, absorption tower; 4, lean- rich liquid heat exchanger; 5, regeneration tower; 6, check valve; 7, regenerated gas compressor; 8, air compressor; 9, carbon dioxide cylinder. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described in combination with specific embodiments.

[0018] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end" and "the other end" is the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "set with", "connection" and so on, should do broad sense understanding, for example "connection", can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the intercommunication of two elements inside.For the ordinary skilled person in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0020] Please refer to the attached Figure 1 The utility model provides a kind of full-process gas circulating device for chemical absorption, comprising gas storage tank 1, flue gas fan 2, absorption tower 3, regeneration tower 5 and regeneration gas compressor 7 specifically;

[0021] Air compressor 8 and carbon dioxide steel bottle 9 are connected with gas storage tank 1, for providing carbon dioxide and air into gas storage tank 1;

[0022] Flue gas fan 2 is connected with gas storage tank 1 and absorption tower 3, for pumping the carbon dioxide and air in gas storage tank 1 into absorption tower 3;Decarburization flue gas generated in absorption tower 3 is transmitted into gas storage tank 1 by pipeline;

[0023] Absorption tower 3 is connected with regeneration tower 5 by lean-rich liquid heat exchanger 4, for sending rich liquid from the bottom of absorption tower 3 into regeneration tower 5 through lean-rich liquid heat exchanger 4;And send lean liquid from the bottom of regeneration tower 5 into absorption tower 3 through lean-rich liquid heat exchanger 4;

[0024] One end of regeneration gas compressor 7 is connected with regeneration tower 5, and the other end is connected with gas storage tank 1 through one-way valve 6, for pumping carbon dioxide in regeneration tower 5 into gas storage tank 1.

[0025] Through the device, the amount of carbon dioxide consumed in the experimental process can be reduced, and the experimental cost is saved;By setting regeneration gas compressor 7 and one-way valve 6, the recovery of carbon dioxide is realized, and the gas in gas storage tank 1 from entering regeneration tower 5 to affect the experimental process is avoided.

[0026] In the embodiment, two pipelines are provided at the top of gas storage tank 1, one is used for recovering decarburization flue gas in absorption tower 3, and the other is used for recovering carbon dioxide generated in regeneration tower 5, and the carbon dioxide concentration in air will affect the efficiency of subsequent absorption process. Carbon dioxide sensor can be installed to monitor the carbon dioxide concentration in gas storage tank 1 and the change of carbon dioxide concentration in absorption tower in real time, so as to dynamically adjust the mixing ratio of gas, maintain the appropriate concentration of carbon dioxide in absorption tower, and ensure the efficient operation of the system.

[0027] In use, through the two-way pipeline at the top of the gas storage tank 1, carbon dioxide in the regeneration tower 5 can be recovered in time, effectively reducing carbon emissions during the experiment, saving a lot of resources, and through the setting of the regeneration gas compressor and the one-way valve and other devices, efficient recovery of carbon dioxide is realized, and the utilization efficiency of the equipment is improved.

[0028] In actual operation, the temperature change of the chemical absorption process will have a significant impact on the reaction efficiency and the absorption capacity of carbon dioxide. Heat management devices such as heat exchangers or cooling systems can be added between the absorption tower 3 and the regeneration tower 5 to keep the temperature within the optimal range, avoiding the impact of high or low temperature on gas absorption and decarburization efficiency. For example, using a heat exchanger between the absorption tower 3 and the regeneration tower 5, the heat in the rich liquid is recovered, the energy efficiency is improved, and the overall energy consumption of the system is reduced.

[0029] In the gas circulation system, the control of gas flow and pressure is crucial. Flow meters and pressure sensors can be introduced to monitor the gas flow and pressure of the absorption tower 3 and the regeneration tower 5 in real time, ensuring that the system is always in the best operating condition. According to the pressure change, the working state of the pump and the compressor is automatically adjusted to optimize the efficiency of the gas circulation;

[0030] During the heat exchange process between the rich liquid and the lean liquid, the performance of the absorption liquid can be further optimized. For example, regularly check and replace the absorption liquid, or improve the absorption capacity of the absorption liquid by adding chemical additives to increase the absorption efficiency of carbon dioxide. At the same time, the recycling of the absorption liquid can be explored, such as cleaning and regeneration after each experimental period to reduce the consumption of chemical reagents and prolong the service life of the liquid;

[0031] The regeneration process usually consumes a certain amount of heat energy. The introduction of a waste heat recovery system uses the heat generated by the regeneration tower 5 to heat the absorption tower 3 or other parts that require heat energy, thereby realizing closed-loop utilization of energy and reducing overall energy consumption. If there is a large amount of low-grade heat source in the system, heat pump technology or adsorption cooling technology can be used to further improve the heat energy utilization efficiency of the system.

[0032] In this embodiment, the entire gas circulation system is integrated with an automatic control system, and a PLC control system is used to coordinate and control each link: for example, automatically adjusting the working state of the air compressor 8 and the regeneration gas compressor 7, and real-time adjusting the gas flow, pressure, temperature and other parameters to maximize the utilization rate of the gas;

[0033] The gas storage tank, pipeline and other equipment in contact with carbon dioxide are made of corrosion-resistant materials to avoid corrosion of the equipment under the condition of long-term contact with high-concentration carbon dioxide gas. At the same time, a regular equipment maintenance and inspection mechanism is established to ensure long-term stable operation of the system.

[0034] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A full-process gas circulation device for chemical absorption, characterized by, The device comprises: a gas storage tank (1), a flue gas fan (2), an absorption tower (3), a regeneration tower (5) and a regeneration gas compressor (7); An air compressor (8) and a carbon dioxide cylinder (9) are connected with the gas storage tank (1) for providing carbon dioxide and air to the gas storage tank (1); The flue gas fan (2) is connected with the gas storage tank (1) and the absorption tower (3) for pumping the carbon dioxide and air in the gas storage tank (1) into the absorption tower (3); the decarbonized flue gas generated in the absorption tower (3) is transmitted into the gas storage tank (1) through a pipeline; The absorption tower (3) is connected with the regeneration tower (5) through a lean-rich liquid heat exchanger (4) for sending the rich liquid from the bottom of the absorption tower (3) into the regeneration tower (5) through the lean-rich liquid heat exchanger (4); and sending the lean liquid from the bottom of the regeneration tower (5) into the absorption tower (3) through the lean-rich liquid heat exchanger (4); The regeneration gas compressor (7) is connected with the regeneration tower (5) at one end and connected with the gas storage tank (1) through a one-way valve (6) at the other end for pumping the carbon dioxide in the regeneration tower (5) into the gas storage tank (1).

2. A full flow gas recycle apparatus for chemical absorption according to claim 1, wherein, Two pipelines are arranged at the top of the gas storage tank (1), one of which is used for recovering the decarbonized flue gas in the absorption tower (3), and the other is used for recovering the carbon dioxide generated in the regeneration tower (5).

3. A full flow gas recycle apparatus for chemical absorption according to claim 2, wherein, A carbon dioxide sensor is installed in the pipeline for real-time monitoring of the carbon dioxide concentration in the gas storage tank (1) and the change of the carbon dioxide concentration in the absorption tower (3).

4. A full flow gas recycle apparatus for chemical absorption according to claim 1, wherein A PLC control system is arranged in the pipeline, which is connected with the air compressor (8) and the regeneration gas compressor (7) for adjusting the working state of the air compressor (8) and the regeneration gas compressor (7).

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