Blast furnace gas carbon capture pretreatment system and adsorption and desorption mechanism

Abstract

The invention relates to the technical field of blast furnace gas treatment, and discloses an adsorption and desorption mechanism of a blast furnace gas carbon capture pretreatment system, which comprises a tower body, the bottom and the top of which are respectively provided with a first opening and a second opening; the heat exchange pipeline is arranged in the tower body, the heat exchange pipeline is communicated with a gas inlet of a pressure swing adsorption mechanism in the blast furnace gas carbon capture pretreatment system or a first opening of another tower body, a treatment cavity is formed between the heat exchange pipeline and the inner side wall of the tower body, the treatment cavity is filled with an adsorbent, and the treatment cavity is communicated with the first opening and the second opening; the gas distributor is communicated with the heat exchange pipeline; the first opening is further used for being communicated with a first air outlet of the pressure swing adsorption mechanism; the second opening is used for being communicated with an inlet of the pressure swing adsorption mechanism; according to the blast furnace gas heat utilization device, blast furnace gas heat can be efficiently utilized, waste of heat energy is prevented, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace gas treatment, and in particular to a blast furnace gas carbon capture pretreatment system and an adsorption analysis mechanism. Background Art

[0002] The CO2 in the steel industry mainly comes from the emission of gas from the blast furnace process. Every ton of pig iron produced will generate 1300-1600m 3 Blast furnace gas, which is mainly composed of combustible gases such as N2 (40-60%), CO2 (15-30%), CO (20-30%), H2 (1-3%) and CH4 (0.2-0.5%) and impurity gases such as O2 (0.2-0.4%), H2O (6-8%), H2S / COS (100-200ppm), also contains certain pressure and temperature. Capturing CO2 from blast furnace gas can reduce CO2 emissions from steel production.

[0003] For the reduction of CO2 emissions in the blast furnace process, adsorption capture is a carbon emission reduction technology with good prospects. According to the process requirements, the current application of adsorption mainly includes the combination of temperature swing adsorption and pressure swing adsorption. This technology uses the difference in adsorption performance of different gases to selectively adsorb adsorbents. Usually, temperature swing adsorption is used for blast furnace gas pretreatment to remove impurity gases in the gas, reduce the impact of impurity gases on carbon capture, and ensure the efficient capture of CO2 by subsequent carbon capture devices; then pressure swing adsorption is used to capture CO2 in blast furnace gas to obtain high-concentration CO2 gas. The temperature of blast furnace gas is generally above 100°C, which is not conducive to gas adsorption. Cooling treatment will cause heat waste, resulting in heat that cannot be used. Summary of the invention

[0004] The object of the present invention is to provide a blast furnace gas carbon capture pretreatment system and an adsorption and analysis mechanism, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides an adsorption and analysis mechanism of a blast furnace gas carbon capture pretreatment system, comprising:

[0006] A tower body, the bottom and the top of which are respectively provided with a first opening and a second opening;

[0007] a heat exchange pipeline, which is arranged in the tower body, the heat exchange pipeline is connected to the air inlet of the pressure swing adsorption mechanism of the blast furnace gas carbon capture pretreatment system or the first opening of another tower body, a processing chamber is formed between the heat exchange pipeline and the inner wall of the tower body, the processing chamber is filled with adsorbent, and the processing chamber is connected to the first opening and the second opening;

[0008] A gas distributor, which is connected to the heat exchange pipeline;

[0009] The first opening is also used to communicate with the first gas outlet of the pressure swing adsorption mechanism;

[0010] The second opening is used to communicate with the inlet gas of the pressure swing adsorption mechanism;

[0011] The adsorbent in the processing chamber includes a saturated state and a resolved state;

[0012] Wherein, when the adsorbent in the processing chamber is in a saturated state, the gas distributor passes blast furnace gas into the heat exchange pipeline so that the blast furnace gas exchanges heat with the adsorbent through the pipe wall of the heat exchange pipeline to form low-temperature gas, and at the same time, the adsorbent enters a decomposition state, and the low-temperature gas is passed into the pressure swing adsorption mechanism to adsorb and capture CO2, or the low-temperature gas is passed into the first opening of another tower body in a decomposition state;

[0013] When the adsorbent in the processing chamber is in a decomposition state, the low-temperature coal gas in the heat exchange pipeline in the other tower body enters the processing chamber through the first opening to purge the adsorbent and then enters the pressure swing adsorption mechanism through the second opening to adsorb and capture CO2, or the unadsorbed concentrated coal gas in the pressure swing adsorption mechanism enters the processing chamber through the first opening to purge the adsorbent and then enters the pressure swing adsorption mechanism through the second opening to adsorb and capture CO2.

[0014] Optionally, the gas distributor includes a plurality of external pipelines and a plurality of internal pipelines that are connected to each other, the plurality of external pipelines are used to connect to the blast furnace gas, and the plurality of internal pipelines are connected to the heat exchange pipeline.

[0015] Optionally, the heat exchange pipeline is a plurality of spiral tubes, and the plurality of spiral tubes are connected to the plurality of internal pipelines.

[0016] Optionally, a plurality of the spiral tubes are interconnected.

[0017] Optionally, a plurality of the spiral tubes are arranged vertically side by side.

[0018] Optionally, the blast furnace gas flow direction in the internal pipeline is perpendicular to the blast furnace gas flow direction in the spiral tube array.

[0019] The present invention also provides a blast furnace gas carbon capture pretreatment system, comprising:

[0020] Gas source;

[0021] The adsorption and analysis mechanism of the blast furnace gas carbon capture pretreatment system, the heat exchange pipeline is connected to the gas source, and the gas source is used to transport the blast furnace gas to the heat exchange pipeline;

[0022] A pressure swing adsorption mechanism is used to capture CO2 from the blast furnace gas, and obtain high-concentration C gas after adsorption, and the non-adsorbed gas is concentrated gas. The pressure swing adsorption mechanism is provided with an air inlet and a first air outlet;

[0023] The air inlet is connected to the heat exchange pipeline or the second outlet, the first air outlet is connected to the first opening, and the first air outlet is used to transport the concentrated coal gas to the first opening.

[0024] Optionally, the pressure swing adsorption mechanism is further provided with a second gas outlet, and the second gas outlet is used to discharge the high-concentration CO2 gas.

[0025] Optionally, a gas storage tank is also included, and the gas storage tank is connected to the second opening.

[0026] Optionally, the blast furnace gas carbon capture pretreatment system has multiple adsorption and analysis mechanisms.

[0027] The present invention discloses the following technical effects: by arranging an adsorbent that has completed adsorption in a processing chamber, and then passing blast furnace gas into a heat exchange pipeline through a gas distributor, the impurity gas adsorbed on the adsorbent can be thermally resolved through heat exchange between the heat exchange pipeline and the adsorbent, and the regeneration of the adsorbent is completed. At the same time, after the temperature of the blast furnace gas is reduced, a low-temperature gas is formed and passed into the processing chamber of a tower body that has completed the resolution, and the adsorbent is decontaminated and then enters a pressure swing adsorption mechanism for adsorption treatment or is directly passed into the pressure swing adsorption mechanism for adsorption treatment. The unabsorbed concentrated gas is again passed into the processing chamber through a first opening to purge the adsorbent that is in a resolution state, and the impurity gas resolved from the adsorbent is discharged through a second opening to achieve adsorbent regeneration. This can not only effectively reduce the temperature of the blast furnace gas, but also enable the adsorbent that has completed adsorption to be resolved and regenerated, and efficiently utilize the heat of the blast furnace gas, prevent the waste of thermal energy, and improve energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 It is a schematic diagram of the structure of the adsorption and analysis mechanism of the present invention;

[0030] Figure 2 This is a schematic structural diagram of a blast furnace gas carbon capture pretreatment system according to the present invention;

[0031] Figure 3 It is a schematic diagram of multiple adsorption and analysis mechanisms of the present invention.

[0032] In the figure: 1. tower body; 11. first opening; 12. second opening; 13. heat exchange pipeline; 14. processing chamber; 15. gas distributor; 151. external pipeline; 152. internal pipeline; 2. pressure swing adsorption mechanism; 3. gas source; 4. high concentration CO2 gas. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figure 1-Figure 3 The present invention provides an adsorption and analysis mechanism of a blast furnace gas carbon capture pretreatment system, comprising:

[0036] The tower body 1 has a first opening 11 and a second opening 12 at its bottom and top respectively;

[0037] A heat exchange pipeline 13 is arranged in the tower body 1, and the heat exchange pipeline 13 is connected to the air inlet of the pressure swing adsorption mechanism 2 in the blast furnace gas carbon capture pretreatment system or the first opening 11 of another tower body 1. A processing chamber 14 is formed between the heat exchange pipeline 13 and the inner wall of the tower body 1, and the processing chamber 14 is filled with an adsorbent. The processing chamber 14 is connected to the first opening 11 and the second opening 12;

[0038] A gas distributor 15, which is connected to the heat exchange pipeline 13;

[0039] The first opening 11 is also used to communicate with the first gas outlet of the pressure swing adsorption mechanism 2;

[0040] The second opening 12 is used to communicate with the inlet gas of the pressure swing adsorption mechanism 2;

[0041] The adsorbent in the processing chamber 14 includes a saturated state and a resolved state;

[0042] When the adsorbent in the processing chamber 14 is in a saturated state, the gas distributor 15 passes the blast furnace gas into the heat exchange pipeline 13 so that the blast furnace gas is heat exchanged with the adsorbent through the pipe wall of the heat exchange pipeline 13 to form low-temperature gas. At the same time, the adsorbent enters a desorption state, and the low-temperature gas is passed into the pressure swing adsorption mechanism 2 for adsorption and capture of CO2, or the low-temperature gas is passed into the first opening 11 of another tower body 1 in a desorption state.

[0043] When the adsorbent in the processing chamber 14 is in a decomposition state, the low-temperature coal gas in the heat exchange pipeline 13 in the other tower body 1 enters the processing chamber 14 through the first opening 11 to purge the adsorbent, and then enters the pressure swing adsorption mechanism 2 through the second opening 12 to adsorb and capture CO2, or the unadsorbed concentrated coal gas in the pressure swing adsorption mechanism 2 enters the processing chamber 14 through the first opening 11 to purge the adsorbent, and then enters the pressure swing adsorption mechanism 2 through the second opening 12 to adsorb and capture CO2.

[0044] By setting an adsorbent that has completed adsorption in the processing chamber 14, and then passing the blast furnace gas into the heat exchange pipeline 13 through the gas distributor 15, the impurity gas adsorbed on the adsorbent can be thermally decomposed through the heat exchange between the heat exchange pipeline 13 and the adsorbent, and the adsorbent can be regenerated. At the same time, the blast furnace gas temperature is reduced to form low-temperature gas, which is passed into the processing chamber 14 of the tower body 1 that has completed decomposition to remove impurities from the adsorbent and then enters the pressure swing adsorption mechanism 2 for adsorption treatment or directly enters the pressure swing adsorption mechanism 2 for adsorption treatment. The unadsorbed concentrated gas is re-introduced into the processing chamber 14 through the first opening to purge the adsorbent in the decomposition state, and the impurity gas decomposed from the adsorbent is discharged through the second opening 12 to achieve adsorbent regeneration. This can not only effectively reduce the blast furnace gas temperature, but also enable the adsorbent that has completed adsorption to be decomposed and regenerated, efficiently utilize the heat of the blast furnace gas, prevent waste of thermal energy, and improve energy utilization efficiency.

[0045] Furthermore, the adsorbent is an adsorbent containing impurities after temperature swing adsorption.

[0046] According to a further optimization scheme, the gas distributor 15 includes a plurality of external pipelines 151 and a plurality of internal pipelines 152 that are connected to each other. The plurality of external pipelines 151 are used to connect to the blast furnace gas, and the plurality of internal pipelines 152 are connected to the heat exchange pipeline 13 .

[0047] Further optimizing the scheme, the heat exchange pipeline 13 is a plurality of spiral tubes, and the plurality of spiral tubes are connected with the plurality of internal pipelines 152. The plurality of spiral tubes are connected. The plurality of spiral tubes are arranged vertically side by side. The blast furnace gas flow direction in the internal pipeline 152 is perpendicular to the blast furnace gas flow direction in the spiral tubes.

[0048] Multiple external pipelines 151, multiple internal pipelines 152 and multiple spiral tubes cooperate to realize multi-point distributed air intake and heat the adsorbent at different positions, which can achieve uniform heating of the adsorbent and prevent uneven heating of the adsorbent during conventional thermal regeneration, local over-high or over-low temperatures, and incomplete regeneration of the adsorbent, and effectively reduce the volume and footprint of the entire device.

[0049] The present invention also provides a blast furnace gas carbon capture pretreatment system, comprising:

[0050] Gas source 3;

[0051] An adsorption and analysis mechanism of a blast furnace gas carbon capture pretreatment system, wherein a heat exchange pipeline 13 is connected to a gas source 3, and the gas source 3 is used to transport blast furnace gas to the heat exchange pipeline 13;

[0052] The pressure swing adsorption mechanism 2 is used to capture CO2 from blast furnace gas, and obtain high-concentration CO2 gas 4 after adsorption, and the unadsorbed gas is concentrated gas. The pressure swing adsorption mechanism is provided with an air inlet and a first air outlet;

[0053] The air inlet is connected to the heat exchange pipeline 13 or the second outlet 12 , and the first air outlet is connected to the first opening 11 . The first air outlet is used to transport concentrated coal gas to the first opening 11 .

[0054] As a further optimization scheme, a second gas outlet is also provided on the pressure swing adsorption mechanism 2, and the second gas outlet is used to discharge the high-concentration CO2 gas 4.

[0055] A further optimized solution further includes a gas storage tank, which is connected to the second opening 12 .

[0056] The gas storage tank can be used to store the gas with impurities discharged from the second opening 12 .

[0057] According to a further optimization scheme, a blast furnace gas carbon capture pretreatment system has multiple adsorption and analysis mechanisms, and the multiple adsorption and analysis mechanisms can operate alternately, so that the blast furnace gas carbon capture pretreatment system maintains good working efficiency.

[0058] This embodiment uses steel blast furnace gas as the CO2 capture raw gas for illustration, and the composition of the raw gas is shown in Table 1.

[0059] Table 1

[0060]

[0061] The blast furnace gas temperature is 120°C, which is cooled to 40°C. It enters the pressure swing adsorption mechanism 2 for CO2 capture, and finally obtains a high-concentration CO2 gas 4.

[0062] The composition of the obtained high concentration CO2 gas 4 is shown in Table 2:

[0063] Table 2

[0064]

[0065] Furthermore, the composition of the blast furnace gas raw gas is the same, the blast furnace gas temperature is 120°C, and the blast furnace gas temperature after cooling is 60°C. It enters the pressure swing adsorption mechanism 2 for CO2 capture, and finally obtains a high-concentration CO2 gas 4.

[0066] The composition of the obtained high concentration CO2 gas 4 is shown in Table 3:

[0067] Table 3

[0068]

[0069] Comparative Example 1

[0070] The composition of the blast furnace gas raw gas is the same, the blast furnace gas temperature is 120°C, and the blast furnace gas without cooling directly enters the pressure swing adsorption mechanism 2 for CO2 capture, and finally obtains a high-concentration CO2 gas 4.

[0071] The composition of the obtained high concentration CO2 gas 4 is shown in Table 4:

[0072] Table 4

[0073]

[0074] In this comparative example, the blast furnace gas was not cooled, resulting in too high a pressure swing adsorption temperature and poor CO2 adsorption effect. The purity of the CO2 product gas obtained was only 60.2%, indicating that the blast furnace gas needs to be cooled.

[0075] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0076] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An adsorption and analysis mechanism for a blast furnace gas carbon capture pretreatment system, characterized in that: include: A tower body (1) having a first opening (11) and a second opening (12) respectively disposed at the bottom and the top; A heat exchange pipeline (13) is arranged in the tower body (1), the heat exchange pipeline (13) is connected to the air inlet of the pressure swing adsorption mechanism (2) in the blast furnace gas carbon capture pretreatment system or the first opening (11) of another tower body (1), a processing chamber (14) is formed between the heat exchange pipeline (13) and the inner wall of the tower body (1), the processing chamber (14) is filled with an adsorbent, and the processing chamber (14) is connected to the first opening (11) and the second opening (12); A gas distributor (15), which is in communication with the heat exchange pipeline (13); The first opening (11) is also used to communicate with the first gas outlet of the pressure swing adsorption mechanism (2); The second opening (12) is used to be in gas communication with the inlet of the pressure swing adsorption mechanism (2); The adsorbent in the processing chamber (14) includes a saturated state and a resolved state; When the adsorbent in the processing chamber (14) is in a saturated state, the gas distributor (15) passes blast furnace gas into the heat exchange pipeline (13) so that the blast furnace gas is heat exchanged with the adsorbent through the pipe wall of the heat exchange pipeline (13) to form low-temperature gas. At the same time, the adsorbent enters a desorption state, and the low-temperature gas is passed into the pressure swing adsorption mechanism (2) to adsorb and capture CO2, or the low-temperature gas is passed into the first opening (11) of another tower body (1) in a desorption state. When the adsorbent in the processing chamber (14) is in a desorbed state, the low-temperature coal gas in the heat exchange pipeline (13) in the other tower body (1) enters the processing chamber (14) through the first opening (11) to purge the adsorbent, and then enters the pressure swing adsorption mechanism (2) through the second opening (12) to adsorb and capture CO2, or the unadsorbed concentrated coal gas in the pressure swing adsorption mechanism (2) enters the processing chamber (14) through the first opening (11) to purge the adsorbent, and then enters the pressure swing adsorption mechanism (2) through the second opening (12) to adsorb and capture CO2.

2. The adsorption and analysis mechanism of the blast furnace gas carbon capture pretreatment system according to claim 1, characterized in that: The gas distributor (15) comprises a plurality of external pipelines (151) and a plurality of internal pipelines (152) which are connected to each other. The plurality of external pipelines (151) are used to connect the blast furnace gas, and the plurality of internal pipelines (152) are connected to the heat exchange pipeline (13).

3. The adsorption and analysis mechanism of the blast furnace gas carbon capture pretreatment system according to claim 2, characterized in that: The heat exchange pipeline (13) is a plurality of spiral tubes, and the plurality of spiral tubes are connected to the plurality of internal pipelines (152).

4. The adsorption and analysis mechanism of the blast furnace gas carbon capture pretreatment system according to claim 3, characterized in that: A plurality of the spiral tubes are interconnected.

5. The adsorption and analysis mechanism of the blast furnace gas carbon capture pretreatment system according to claim 3, characterized in that: A plurality of the spiral tubes are arranged vertically and side by side.

6. The adsorption and analysis mechanism of the blast furnace gas carbon capture pretreatment system according to claim 3, characterized in that: The direction of the blast furnace gas flow in the internal pipeline (152) is perpendicular to the direction of the blast furnace gas flow in the spiral tube array.

7. A blast furnace gas carbon capture pretreatment system, characterized in that: include: Gas source (3); An adsorption and analysis mechanism for a blast furnace gas carbon capture pretreatment system according to any one of claims 1 to 6, wherein the heat exchange pipeline (13) is connected to the gas source (3), and the gas source (3) is used to transport the blast furnace gas to the heat exchange pipeline (13); A pressure swing adsorption mechanism (2) is used to capture CO2 from the blast furnace gas, and obtain high-concentration CO2 gas (4) after adsorption, and the non-adsorbed gas is concentrated gas. The pressure swing adsorption mechanism is provided with an air inlet and a first air outlet; The air inlet is connected to the heat exchange pipeline (13) or the second outlet (12), the first air outlet is connected to the first opening (11), and the first air outlet is used to transport the concentrated coal gas to the first opening (11).

8. A blast furnace gas carbon capture pretreatment system according to claim 7, characterized in that: The pressure swing adsorption mechanism (2) is also provided with a second gas outlet, and the second gas outlet is used to discharge the high-concentration CO2 gas (4).

9. A blast furnace gas carbon capture pretreatment system according to claim 7, characterized in that: It also includes a gas storage tank, which is connected to the second opening (12).

10. A blast furnace gas carbon capture pretreatment system according to claim 7, characterized in that: The blast furnace gas carbon capture pretreatment system has multiple adsorption and analysis mechanisms.

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