A gas purification system

Abstract

The application discloses a gas purification system and relates to the technical field of temperature swing adsorption towers. The gas purification system comprises a raw material gas supply pipeline, N adsorption towers, an inlet gas gating assembly, an outlet gas gating assembly, a purified gas output pipeline, a cooling unit, a heating unit and a regeneration gas output pipeline; N is an integer, and N is greater than or equal to 4; the inlet gas gating assembly is connected with the raw material gas supply pipeline, the inlet ends of the N adsorption towers, the inlet end of the heating unit and the regeneration gas output pipeline respectively; the outlet gas gating assembly is connected with the outlet ends of the N adsorption towers, the purified gas output pipeline, the outlet end of the cooling unit and the outlet end of the heating unit respectively; and the inlet end of the cooling unit is connected with the purified gas output pipeline. The application can reduce the loss of purified gas in the process of temperature rise desorption and temperature drop resorption of the adsorption towers in the gas purification system.

Description

Technical Field

[0001] This application relates to the field of temperature-switching adsorption tower technology, and more specifically to a gas purification system, which is particularly suitable for the purification and treatment of industrial waste gas containing impurities such as sulfides and / or tar, naphthalene, etc. Background Technology

[0002] Raw material gases containing impurities such as sulfides, tar, and naphthalene, such as industrial waste gases, are often purified through gas purification systems. A gas purification system typically includes an adsorption tower, a heating unit, and a cooling unit. The adsorption tower removes impurities using temperature-switched adsorption (TSA). In short, it utilizes the characteristic that the equilibrium adsorption capacity of the adsorbent in the adsorption tower decreases with increasing temperature, alternating between adsorption and regeneration steps.

[0003] Specifically, the adsorption step refers to the adsorbent in the adsorption tower adsorbing impurities in the feed gas at the adsorption temperature. The regeneration step includes heating desorption and cooling resorption. Heating desorption refers to the heating unit raising the temperature of the adsorbent in the adsorption tower above the adsorption temperature, causing the impurities adsorbed on the adsorbent to desorb and leave the adsorbent. Cooling resorption refers to the cooling unit lowering the temperature of the adsorbent in the adsorption tower back to the adsorption temperature, allowing the adsorbent to restore its ability to adsorb impurities.

[0004] In existing gas purification systems, such as the prior art with publication number CN108977235A and application date of September 17, 2018, a device for removing impurities from coal gas using a variable temperature adsorption method is mentioned. In this prior art, the heating unit is a regenerated gas heater, and the cooling unit is a secondary pipe connected in parallel with the regenerated gas heater.

[0005] Thus, in existing patent literature, a portion of the purified gas output after the adsorption step in the adsorption tower is used as regeneration gas. The regeneration gas, heated by a regeneration gas heater, raises the temperature of the adsorbent in the adsorption tower for desorption, and then, through a secondary pipe, the unheated regeneration gas is used to lower the temperature of the adsorbent in the adsorption tower for resorption. Since the regeneration gas passing through the regeneration gas heater and the regeneration gas passing through the secondary pipe require two separate purified gas streams, this results in significant losses of purified gas.

[0006] Therefore, how to reduce the loss of purified gas in the adsorption tower of the gas purification system during the process of heating desorption and cooling resorption is still a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, in order to solve the above-mentioned technical problems, this application provides a gas purification system, which includes a raw gas supply pipeline, N adsorption towers, an inlet gas selection component, an outlet gas selection component, a purified gas output pipeline, a cooling unit, a heating unit, and a regeneration gas output pipeline; N is an integer and N≥4; The air intake selection assembly is connected to the raw material gas supply pipeline, the air intake of N adsorption towers, the air intake of the heating unit, and the regeneration gas output pipeline, respectively. The gas outlet selection component is connected to the gas outlet of N adsorption towers, the purified gas output pipeline, the gas outlet of the cooling unit, and the gas outlet of the heating unit, respectively; the gas inlet of the cooling unit is connected to the purified gas output pipeline. Among them, the outlet gas selection component and the inlet gas selection component can divide the N adsorption towers into adsorption section adsorption towers, cooling section adsorption towers and heating section adsorption towers, and switch between adsorption section adsorption towers, heating section adsorption towers and cooling section adsorption towers alternately; the raw material gas supply pipe, adsorption section adsorption tower, purified gas output pipe, cooling unit, cooling section adsorption tower, heating unit, heating section adsorption tower and regeneration gas output pipe are connected in sequence.

[0008] Beneficial Effects: Unlike existing technologies, in this application, the raw gas supply pipe, the adsorption tower, and the purified gas output pipe are connected sequentially. The raw gas supply pipe supplies raw gas to the adsorption tower, enabling the adsorption tower to perform the adsorption step, thus reducing impurities and converting the raw gas into purified gas for output. The cooling unit receives a portion of the purified gas output from the adsorption tower as regeneration gas and cools it before introducing it into the cooling adsorption tower for cooling and re-adsorption. The heating unit receives the regeneration gas output from the cooling adsorption tower and heats it before introducing it into the heating adsorption tower for heating and desorption. This provides at least three technical advantages. First, it allows the adsorption and regeneration steps to be performed in parallel within different adsorption towers, ensuring that an adsorption tower is always available within the gas purification system to perform the adsorption step continuously. Second, heating desorption and cooling re-adsorption are achieved using the same purified gas stream, thus reducing the loss of purified gas. Thirdly, the regenerated gas passing through the cooling adsorption tower can be preheated due to heat exchange with the cooling adsorption tower, thereby reducing the heat energy required by the heating unit to heat the regenerated gas. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the gas purification system of this application; Figure 2 This is a schematic diagram showing the connection relationship between the adsorption section adsorption tower, the heating section adsorption tower, and the cooling section adsorption tower formed at a certain moment in the gas purification system of this application. Figure 3 The gas purification system of this application is in Figure 2 A schematic diagram showing the connection relationship between the adsorption section, the heating section, and the cooling section adsorption tower formed at another time after the indicated time. Figure 4 The gas purification system of this application is in Figure 3 A schematic diagram showing the connection relationship between the adsorption section, the heating section, and the cooling section adsorption tower formed at another time after the indicated time. Figure 5 This is a schematic diagram of the connection relationships of some structures of the gas purification system of this application. Figure 5 The first manual valve is not shown. Figure 6 yes Figure 5 Enlarged schematic diagram of the central intake gate assembly. Figure 6 The first manual valve is not shown. Figure 7 yes Figure 5 Enlarged schematic diagram of the central air outlet gate component. Figure 7 The first manual valve is not shown. Figure 8 This is a schematic diagram showing the connection relationship between the first selector valve and the first manual valve among any one of the first selector valve, second selector valve, third selector valve, fourth selector valve, fifth selector valve, and sixth selector valve of the gas purification system of this application. Figure 8 The first manual valve is shown. Figure 9 This is a schematic diagram showing the connection relationship between the inlet gas selection component, the outlet gas selection component, the purified gas output pipeline, the cooling unit, and the heating unit of the gas purification system of this application. Figure 10 yes Figure 9 Enlarged schematic diagram of region A in the middle; Figure 11 yes Figure 9 Enlarged schematic diagram of region B in the middle; Figure 12 This is a schematic diagram showing the connection relationship between the bypass pipeline, the raw gas supply pipeline, and the gas-liquid separation device of the gas purification system of this application; Figure 13 This is a schematic diagram of the structural composition of either the raw material gas inlet valve group or the purified gas outlet valve group of the gas purification system of this application. Figure 14 This is a schematic diagram of the structure of either the bypass valve group or the regenerated gas outlet valve group of the gas purification system of this application.

[0010] Explanation of reference numerals in the attached figures: Gas purification system 10; raw material gas supply pipe 100; inlet gas selection component 200; adsorption tower 300; adsorption section adsorption tower 30a; heating section adsorption tower 30b; cooling section adsorption tower 30c; outlet gas selection component 400; purified gas output pipeline 500; cooling unit 600; heating unit 700; regeneration gas output pipeline 800; bypass pipeline 900; gas-liquid separator 1000; first branch 1100; third manual valve 1110; first automatic flow regulating valve 1120; fourth manual valve 1130; second branch 1200; fifth manual valve 1210. Raw material gas inlet valve group 13; purified gas outlet valve group 14; bypass valve group 15; regenerated gas outlet valve group 16; first electric metal-sealed butterfly valve a1; first electric sector blind valve a2; second electric metal-sealed butterfly valve a3; third electric metal-sealed butterfly valve b1; second electric sector blind valve b2. First selector valve 210; Second selector valve 220; Third selector valve 230; Fourth selector valve 410; Fifth selector valve 420; Sixth selector valve 430; First manual valve 11; First programmable valve 12; Water cooler 610; pressurizing fan 620; cooling water inlet pipe 630; cooling water return pipe 640; cooling device 650; gas flow path 660; flow path selection component 670; third on / off valve 671; second automatic flow regulating valve 680; Heater 710; Steam heater 710a; Steam inlet 711a; Condensate outlet 712a; Heating inlet 713a; Heating outlet 714a; Condensate delivery pipeline 720; Back pressure pipeline 721; Drainage pipeline 722; Back pressure valve 723; First on / off valve 724; Second on / off valve 725; Drainage valve 726. Detailed Implementation

[0011] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] To facilitate understanding, the meanings of some terms are defined below.

[0013] Raw gas: The original gas mixture to be fed into the adsorption tower for purification.

[0014] Purified gas: The gas output after the raw material gas has been purified by the adsorption tower.

[0015] Regeneration gas: This is a portion of the purified gas obtained in the regeneration step. It is used as a gaseous medium to carry desorbed impurities into the adsorption tower, enabling the adsorption tower to complete the regeneration step.

[0016] Please see Figures 1-2 As shown, the gas purification system 10 of this application includes a raw gas supply pipeline 100, N adsorption towers 300, an inlet gas selection component 200, an outlet gas selection component 400, a purified gas output pipeline 500, a cooling unit 600, a heating unit 700, and a regeneration gas output pipeline 800. N is an integer, and N≥4.

[0017] The air intake selection component 200 is connected to the raw material gas supply pipeline 100, the air intake of N adsorption towers 300, the air intake of the heating unit 700, and the regeneration gas output pipeline 800.

[0018] The gas outlet selection component 400 is connected to the gas outlets of N adsorption towers 300, the purified gas output pipeline 500, the gas outlet of the cooling unit 600, and the gas outlet of the heating unit 700. The gas inlet of the cooling unit 600 is connected to the purified gas output pipeline 500.

[0019] The outlet gas selection component 400 and the inlet gas selection component 200 can divide the N adsorption towers 300 into adsorption section adsorption tower 30a, cooling section adsorption tower 30c, and heating section adsorption tower 30b, and switch between these sections alternately. The raw material gas supply pipe 100, adsorption section adsorption tower 30a, purified gas output pipe 500, cooling unit 600, cooling section adsorption tower 30c, heating unit 700, heating section adsorption tower 30b, and regeneration gas output pipe 800 are connected sequentially.

[0020] In the above manner, the raw material gas supply pipe 100, the adsorption tower 30a, and the purified gas output pipe 500 are sequentially connected. The raw material gas supply pipe 100 supplies raw material gas to the adsorption tower 30a, enabling the adsorption tower 30a to perform the adsorption step, thereby reducing impurities and converting the raw material gas into purified gas for output. The cooling unit 600 can receive a portion of the purified gas output from the adsorption tower 30a as regeneration gas and cool it before introducing it into the cooling adsorption tower 30c, allowing the cooling adsorption tower 30c to cool down and re-adsorb. The heating unit 700 can receive the regeneration gas output from the cooling adsorption tower 30c and heat it before introducing it into the heating adsorption tower 30b, allowing the heating adsorption tower 30b to heat up and desorb. This achieves at least the following three technical effects. Firstly, the adsorption and regeneration steps can be performed in parallel within different adsorption towers 300, ensuring that an adsorption section adsorption tower 30a is always available within the gas purification system 10 to perform the adsorption step continuously. Secondly, the heating desorption and cooling resorption are achieved using the same purified gas stream, thus reducing the loss of purified gas. Thirdly, the regeneration gas passing through the cooling section adsorption tower 30c can be preheated through heat exchange with the cooling section adsorption tower 30c, thereby reducing the heat energy required by the heating unit 700 to heat the regeneration gas.

[0021] Optionally, the raw material gas may include, but is not limited to, blast furnace gas or coke oven gas, and the pressure of the raw material gas in the raw material gas supply pipe 100 may be 10 kPa to 25 kPa, but is not limited to this.

[0022] Optionally, the adsorbent in the adsorption tower 300 can be set according to the impurities to be adsorbed. For example, and not as a limitation, in one example, the impurities in the feed gas can be sulfides and / or tar, naphthalene, etc., and the adsorbent in the adsorption tower 300 can include adsorbents for adsorbing sulfides and adsorbents for adsorbing tar and naphthalene. For details, please refer to the prior art, which will not be repeated here.

[0023] It should be noted that the adsorption tower 300 can sequentially cycle between the adsorption section 30a, the heating section 30b, and the cooling section 30c. After the adsorbent in the adsorption section 30a becomes saturated, it is switched to the heating section 30b for desorption at elevated temperatures. After desorption at elevated temperatures in the heating section 30b, it is switched to the cooling section 30c for resorption at lower temperatures. Thus, by sequentially cycling the adsorption tower 300 between the adsorption section 30a, the heating section 30b, and the cooling section 30c, the adsorption tower 300 can repeatedly perform the adsorption and regeneration steps.

[0024] Optionally, in one example, in the gas purification system 10, the number of adsorption towers 30a in the adsorption section can be greater than either the number of adsorption towers 30c in the cooling section or the number of adsorption towers 30b in the heating section, so as to ensure that the gas purification system 10 still has sufficient purified gas output after providing sufficient regeneration gas to perform the regeneration step.

[0025] For example, and not as a limitation, in one example, multiple adsorption towers 30a in the adsorption section are arranged in parallel, with at least one cooling adsorption tower 30c and at least one heating adsorption tower 30b, but not limited thereto.

[0026] As an example, but not a limitation, in another example, multiple adsorption towers 30a arranged in parallel are connected in series between the raw material gas supply pipe 100 and the purified gas output pipe 500; multiple cooling adsorption towers 30c arranged in parallel are connected in series between the cooling unit 600 and the heating unit 700; and multiple heating adsorption towers 30b arranged in parallel are connected in series between the heating unit 700 and the regeneration gas output pipe 800, but are not limited thereto.

[0027] Optionally, the proportion of purified gas received by the cooling unit 600 in the total purified gas output of all adsorption towers 30a in the adsorption sections can be no more than 20%. This ensures that the gas purification system 10 still has no less than 80% of purified gas available for output. It should be noted that in other alternative examples, the proportion of purified gas received by the cooling unit 600 in the total purified gas output of all adsorption towers 30a in the adsorption sections can also be greater than 20%.

[0028] Optionally, the inlet air selection component 200 and the outlet air selection component 400 can switch the connection state of the adsorption tower 300 so that the adsorption tower 300 can be switched to an adsorption section adsorption tower 30a, a heating section adsorption tower 30b, or a cooling section adsorption tower 30c.

[0029] Combination Figure 1 See Figures 2-4 As shown, and not limited to, the example is illustrated with N=5. The five adsorption towers 300 are numbered sequentially from adsorption tower 1 to adsorption tower 5.

[0030] like Figure 2 As shown, at a certain moment, the first to third adsorption towers switch to adsorption section adsorption tower 30a, the fourth adsorption tower switches to cooling section adsorption tower 30c, and the fifth adsorption tower switches to heating section adsorption tower 30b.

[0031] like Figure 3 As shown, in Figure 2 At another time after the indicated time, the first adsorption tower switches to the heating section adsorption tower 30b, the second to fourth adsorption towers switch to the adsorption section adsorption tower 30a, and the fifth adsorption tower switches to the cooling section adsorption tower 30c.

[0032] like Figure 4 As shown, in Figure 3 At another time after the indicated time, the first adsorption tower switches to the cooling section adsorption tower 30c, the second adsorption tower switches to the heating section adsorption tower 30b, and the third to fifth adsorption towers switch to the adsorption section adsorption tower 30a.

[0033] Combination Figures 1-4 See Figure 5 and Figure 6 As shown, the intake gate assembly 200 includes N first gate valves 210, N second gate valves 220 and N third gate valves 230.

[0034] N first selector valves 210 correspond one-to-one with N adsorption towers 300. Each first selector valve 210 is connected to the inlet of the corresponding adsorption tower 300 and the raw material gas supply pipeline 100 to switch the connection state and the blockage state of the inlet of the corresponding adsorption tower 300 and the raw material gas supply pipeline 100.

[0035] N second selector valves 220 correspond one-to-one with N adsorption towers 300. Each second selector valve 220 is connected to the air inlet of the corresponding adsorption tower 300 and the air inlet of the heating unit 700, so as to switch the connection state and the blockage state between the air inlet of the corresponding adsorption tower 300 and the air inlet of the heating unit 700.

[0036] N third selector valves 230 correspond one-to-one with N adsorption towers 300. Each third selector valve 230 is connected to the inlet end of the corresponding adsorption tower 300 and the regeneration gas output pipeline 800 to switch the connection state and the blockage state of the inlet end of the corresponding adsorption tower 300 and the regeneration gas output pipeline 800.

[0037] In the above manner, the N first selector valves 210, the N second selector valves 220, and the N third selector valves 230 can cooperate with each other to perform corresponding operations when the corresponding adsorption tower 300 needs to be switched to the adsorption section adsorption tower 30a, the cooling section adsorption tower 30c, and the heating section adsorption tower 30b.

[0038] When the corresponding adsorption tower 300 needs to be switched to the adsorption section adsorption tower 30a, the inlet end of the corresponding adsorption tower 300 and the raw material gas supply pipeline 100 need to be switched to a connected state through the first selector valve 210, and the inlet end of the corresponding adsorption tower 300 and the inlet end of the heating unit 700 need to be switched to a blocked state through the second selector valve 220, and the inlet end of the corresponding adsorption tower 300 and the regeneration gas output pipeline 800 need to be switched to a blocked state through the third selector valve 230.

[0039] When the corresponding adsorption tower 300 needs to be switched to the heating section adsorption tower 30b, the inlet end of the corresponding adsorption tower 300 and the raw material gas supply pipeline 100 need to be switched to the blocking state through the first selector valve 210, and the inlet end of the corresponding adsorption tower 300 and the inlet end of the heating unit 700 need to be switched to the blocking state through the second selector valve 220, and the inlet end of the corresponding adsorption tower 300 and the regeneration gas output pipeline 800 need to be switched to the connecting state through the third selector valve 230.

[0040] When the corresponding adsorption tower 300 needs to be switched to the cooling section adsorption tower 30c, the inlet end of the corresponding adsorption tower 300 and the raw material gas supply pipeline 100 need to be switched to the blocking state through the first selector valve 210, and the inlet end of the corresponding adsorption tower 300 and the inlet end of the heating unit 700 need to be switched to the connecting state through the second selector valve 220, and the inlet end of the corresponding adsorption tower 300 and the regeneration gas output pipeline 800 need to be switched to the blocking state through the third selector valve 230.

[0041] Combination Figures 1-4 See Figure 5 and Figure 7 As shown, optionally, the exhaust gas selection assembly 400 includes N fourth selection valves 410, N fifth selection valves 420 and N sixth selection valves 430.

[0042] N fourth selector valves 410 correspond one-to-one with N adsorption towers 300. Each fourth selector valve 410 is connected to the gas outlet of the corresponding adsorption tower 300 and the purified gas output pipeline 500 to switch the connection state and the blockage state of the gas outlet of the corresponding adsorption tower 300 and the purified gas output pipeline 500.

[0043] N fifth selector valves 420 correspond one-to-one with N adsorption towers 300. Each fifth selector valve 420 is connected to the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the cooling unit 600, so as to switch the connection state and the blockage state between the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the cooling unit 600.

[0044] N sixth selector valves 430 correspond one-to-one with N adsorption towers 300. Each sixth selector valve 430 is connected to the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the heating unit 700, so as to switch the connection state and the blockage state between the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the heating unit 700.

[0045] In the above manner, the N third selector valves 230, the N fourth selector valves 410, and the N fifth selector valves 420 can cooperate with each other to perform corresponding operations when the corresponding adsorption tower 300 needs to be switched to the adsorption section adsorption tower 30a, the cooling section adsorption tower 30c, and the heating section adsorption tower 30b.

[0046] When the corresponding adsorption tower 300 needs to be switched to the adsorption section adsorption tower 30a, the corresponding gas outlet of the adsorption tower 300 and the purified gas output pipeline 500 need to be switched to a connected state through the fourth selector valve 410, and the corresponding gas outlet of the adsorption tower 300 and the gas outlet of the cooling unit 600 need to be switched to a blocked state through the fifth selector valve 420, and the corresponding gas outlet of the adsorption tower 300 and the gas outlet of the heating unit 700 need to be switched to a blocked state through the sixth selector valve 430.

[0047] When the corresponding adsorption tower 300 needs to be switched to the heating section adsorption tower 30b, the gas outlet of the corresponding adsorption tower 300 and the purified gas output pipeline 500 need to be switched to the blocking state through the fourth selector valve 410, and the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the cooling unit 600 need to be switched to the blocking state through the fifth selector valve 420, and the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the heating unit 700 need to be switched to the connecting state through the sixth selector valve 430.

[0048] When the corresponding adsorption tower 300 needs to be switched to the cooling section adsorption tower 30c, the gas outlet of the corresponding adsorption tower 300 and the purified gas output pipeline 500 need to be switched to the isolation state through the fourth selector valve 410, and the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the cooling unit 600 need to be switched to the communication state through the fifth selector valve 420, and the gas outlet of the corresponding adsorption tower 300 and the gas outlet of the heating unit 700 need to be switched to the isolation state through the sixth selector valve 430.

[0049] Combination Figures 5-7 See Figure 8 As shown, optionally, the first gate valve 210, the second gate valve 220, the third gate valve 230, the fourth gate valve 410, the fifth gate valve 420 and the sixth gate valve 430 can all switch between an open state and a closed state to achieve switching between a connected state and a blocked state.

[0050] For example, and not as a limitation, the first selector valve 210, the second selector valve 220, the third selector valve 230, the fourth selector valve 410, the fifth selector valve 420 and the sixth selector valve 430 may each include the first programmable valve 12.

[0051] Optionally, the gas purification system 10 may include a first manual valve 11, which is configured corresponding to a first programmable valve 12. Each first programmable valve 12 may be connected in series with a first manual valve 11 upstream. Thus, when the corresponding first programmable valve 12 is damaged, the corresponding first manual valve 11 can be closed to facilitate the maintenance of the corresponding first programmable valve 12.

[0052] It should be noted that a manual valve is a valve that can accept the force of a human hand as the driving force to open and close the valve body. A programmable valve is a valve that is connected to a drive device, so that the drive device opens and closes according to the control signal received by the drive device.

[0053] It is particularly noteworthy that, in other alternative embodiments, the first selector valve 210, the second selector valve 220, the third selector valve 230, the fourth selector valve 410, the fifth selector valve 420, and the sixth selector valve 430 can all be valves other than the first programmable valve 12 that can switch between open and closed states.

[0054] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the cooling unit 600 includes a water cooler 610, the air inlet of which is connected to the purified air output pipeline 500, and the air outlet of which is connected to the air outlet selection component 400.

[0055] The water cooler 610 is used to receive part of the purified gas output from the adsorption tower 30a in the adsorption section as regeneration gas and cool the regeneration gas before passing it in reverse through the gas outlet selection component 400 to the adsorption tower 30c in the cooling section, so that the adsorption tower 30c in the cooling section is cooled and re-adsorbed.

[0056] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the cooling unit 600 includes a pressurizing fan 620, the air inlet of the pressurizing fan 620 is connected to the purified air output pipeline 500, and the air outlet of the pressurizing fan 620 is connected to the air inlet of the water cooler 610.

[0057] The pressurizing fan 620 is used to receive part of the purified gas output from the adsorption tower 30a in the adsorption section as regeneration gas and to pressurize the regeneration gas. The water cooler 610 receives the pressurized regeneration gas.

[0058] In the above manner, the pressurized fan 620 can compensate for, but is not limited to, the pressure drop of regenerated gas in the water cooler 610 and the cooling section adsorption tower 30c.

[0059] Optionally, the pressurizing blower 620 can pressurize the regeneration gas to 3 kPa to 7 kPa, but is not limited thereto. For example, and not as a limitation, the pressurizing blower 620 can pressurize the regeneration gas to 3 kPa, 5 kPa, or 7 kPa.

[0060] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the heating unit 700 includes a heater 710, the air inlet of which is connected to the air inlet selection component 200, and the air outlet of which is connected to the air outlet selection component 400.

[0061] The heater 710 is used to receive the regenerated gas after it has passed through the cooling adsorption tower 30c in reverse and heats the regenerated gas before passing it through the outlet gas selection component 400 in reverse through the heating adsorption tower 30b, so that the heating adsorption tower 30b is heated and desorbed.

[0062] Optionally, combined Figures 1-4 See Figures 9-11 As shown, heater 710 is a steam heater 710a, which has a steam inlet 711a, a condensate outlet 712a, a heating inlet 713a, and a heating outlet 714a.

[0063] Steam inlet 711a is used to receive heating steam, and heating inlet 713a is used to receive regenerated gas after it has passed through the cooling adsorption tower 30c in reverse. Condensate outlet 712a is used to output condensate formed after the heating steam has cooled the gas. Heating outlet 714a is connected to the gas outlet selection component 400 and is used to output the regenerated gas heated by the heating steam to the gas outlet selection component 400.

[0064] Optionally, the steam heater 710a can heat the regeneration gas to 150°C to 170°C, but is not limited thereto. For example, and not as a limitation, the regeneration gas passing through the cooling adsorption tower 30c can be preheated to 70°C to 90°C due to heat exchange with the cooling adsorption tower 30c, thereby reducing the amount of heating steam required by the steam heater 710a to heat the regeneration gas.

[0065] For example, and not limited to, the feed gas can be blast furnace gas or coke oven gas. The regenerated gas exiting the adsorption tower 30b in the heating section has a temperature of 110℃~130℃, which is relatively high and can be used directly in boilers or gas turbines without cooling. In this way, the calorific value of the regenerated gas is indirectly increased, and impurities carried by the regenerated gas can be avoided from clogging the pipeline.

[0066] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the heating unit 700 includes a condensate delivery pipe 720, and the cooling unit 600 includes a cooling water inlet pipe 630 and a cooling water return pipe 640.

[0067] The inlet end of the condensate delivery pipeline 720 is connected to the condensate outlet, and the outlet end of the condensate delivery pipeline 720 is connected to the cooling water return pipeline 640.

[0068] The outlet end of the cooling water inlet pipe 630 is connected to the inlet end of the water cooler 610, and the cooling water return pipe 640 is connected to the return end of the water cooler 610.

[0069] In this way, condensate can be transported to cooling water return pipe 640 through condensate delivery pipe 720. In this way, condensate can be used to replenish the lost cooling water, thereby reducing production costs.

[0070] Optionally, the ratio of the flow rate of the condensate delivery pipeline 720 to the flow rate of the cooling water delivery pipeline, calculated by mass ratio, can be 1:40 to 1:60.

[0071] By employing the above method, since the flow rate of condensate is significantly less than that of cooling water, the condensate's temperature, after being absorbed by the cooling water, is less likely to cause a substantial increase in the cooling water's temperature. In other words, the condensate has little impact on the temperature change of the cooling water. Therefore, the condensate can be recycled back into the cooling water.

[0072] By way of example, and not limitation, for example, in one example, the flow rate ratio of the condensate delivery line 720 to the cooling water delivery line may be 1:40; for example, in another example, the flow rate ratio of the condensate delivery line 720 to the cooling water delivery line may be 1:50; for example, in yet another example, the flow rate ratio of the condensate delivery line 720 to the cooling water delivery line may be 1:60.

[0073] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the cooling unit 600 includes a cooling device 650. The outlet of the cooling device 650 is connected to the inlet of the cooling water inlet pipe 630, and the inlet of the cooling device 650 is connected to the outlet of the cooling water return pipe 640. The cooling device 650 is used to cool the heat-carrying cooling water output from the cooling water return pipe and deliver it to the cooling water inlet pipe 630 through water evaporation and / or air convection.

[0074] As an example, and not a limitation, the cooling device 650 includes, but is not limited to, a cooling tower or other device that can dissipate heat through water evaporation and / or air convection.

[0075] Combination Figures 1-4 See Figures 9-11 As shown, optionally, the condensate delivery line 720 includes a back pressure line 721 and a drain line 722.

[0076] The parallel back pressure pipeline 721 and the drain pipeline 722 are connected in series between the inlet end of the condensate delivery pipeline 720 and the outlet end of the condensate delivery pipeline 720.

[0077] The back pressure pipeline 721 is equipped with a back pressure valve 723, a first on / off valve 724, and a second on / off valve 725. The back pressure valve 723 is connected in series between the first on / off valve 724 and the second on / off valve 725. The drain pipeline 722 is equipped with a drain valve 726.

[0078] In this way, the steam trap 726 allows condensate in the steam heater 710a to be discharged in a timely manner and prevents uncondensed heating steam from being discharged. This prevents condensate accumulation from affecting heating efficiency and also prevents uncondensed heating steam from being discharged, thus avoiding energy waste. After the first on / off valve 724 and the second on / off valve 725 are opened, the back pressure valve 723 can establish back pressure at the outlet of the steam trap 726 to improve the smoothness of drainage from the steam trap 726 and prevent condensate from flashing due to a sudden pressure drop after being discharged from the steam trap 726.

[0079] It should be noted that both the first on / off valve 724 and the second on / off valve 725 can be valves capable of switching between an open state and a closed state. For example, and not as a limitation, both the first on / off valve 724 and the second on / off valve 725 can be one or more of a second manual valve and a second programmable valve. In this embodiment, the example is given where both the first on / off valve 724 and the second on / off valve 725 are second manual valves.

[0080] Optionally, the back pressure established by the back pressure valve 723 at the outlet of the drain valve 726 can be 0.4MPa~0.5MPa, and the hydraulic pressure of the cooling water return pipe can be no more than 0.3MPa, but is not limited thereto.

[0081] In one example, the back pressure established by the back pressure valve 723 at the outlet of the steam trap 726 can be 0.4 MPa, and the hydraulic pressure in the cooling water return pipe can be 0.2 MPa, but is not limited thereto. In another example, the back pressure established by the back pressure valve 723 at the outlet of the steam trap 726 can be 0.46 MPa, and the hydraulic pressure in the cooling water return pipe can be 0.27 MPa, but is not limited thereto. In yet another example, the back pressure established by the back pressure valve 723 at the outlet of the steam trap 726 can be 0.5 MPa, and the hydraulic pressure in the cooling water return pipe can be 0.3 MPa, but is not limited thereto.

[0082] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the cooling unit 600 has multiple gas flow paths 660 and flow path selection components 670. Each gas flow path 660 extends from the inlet end of the cooling unit 600 to the outlet end of the cooling unit 600, and the flow paths of different gas flow paths 660 are different. Multiple sets of pressurized fans 620 are respectively arranged in different gas flow paths 660. Multiple sets of water coolers 610 are respectively arranged in different gas flow paths 660, and the multiple sets of water coolers 610 are arranged in parallel between the outlet end of the cooling water inlet pipe and the inlet end of the cooling water return pipe. The branch selection component is set corresponding to different gas flow paths 660, so as to independently close or open any one or more gas flow paths 660.

[0083] It should be noted that as long as there are non-shared branches between different gas flow paths 660, the flow paths of the different gas flow paths 660 are considered to be different. Multiple sets of pressurized fans 620 can be separately installed on at least two non-shared branches of gas flow paths 660, and multiple sets of water coolers 610 can be installed on at least two non-shared branches of gas flow paths 660.

[0084] Using the above method, one or more pressurized fans 620 and water coolers 610 on the gas flow path 660 can be selected for activation as needed. For example, a portion of the pressurized fans 620 and a portion of the water coolers 610 can be selected as backups, while another portion of the pressurized fans 620 and another portion of the water coolers 610 can be selected as primary devices. When the primary devices are functioning normally, the gas flow path 660 flowing through the primary devices is activated, and the gas flow path 660 flowing through the backup devices is closed. When the primary devices fail, the gas flow path 660 flowing through the backup devices is activated, and the gas flow path 660 flowing through the primary devices is closed.

[0085] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the flow path selection component 670 includes multiple third on-off valves 671, each corresponding to a multiple gas flow path 660. The combination of the open and closed states of the multiple third on-off valves 671 allows for the independent closing or opening of any one or more gas flow paths 660. For example, and not as a limitation, the third on-off valve 671 can be a sixth manual valve. It should be noted that in other alternative embodiments, the third on-off valve 671 can also be an automatic valve.

[0086] Optionally, combined Figures 1-4 See Figures 9-11 As shown, the cooling unit 600 may include a second automatic flow regulating valve 680, which may be disposed on at least one gas flow path 660. In this manner, when the gas flow path 660 through the second automatic flow regulating valve is activated, the flow rate can be regulated by the second automatic flow regulating valve 680.

[0087] It should be noted that an automatic flow regulating valve refers to a valve equipped with a corresponding drive device, such as an electric drive device, a pneumatic drive device, or a hydraulic drive device, to achieve flow regulation through the drive device.

[0088] Optionally, combined Figure 1 See Figure 12As shown, the gas purification system 10 includes a gas-liquid separator 1000 connected in series with the raw gas supply pipeline 100. Thus, the gas-liquid separator 1000 can pre-separate mechanical water from the raw gas, reducing the impact of mechanical water on the adsorbent in the adsorption tower 300. This mechanical water can be suspended water particles, mist, or condensate.

[0089] Optionally, combined Figure 1 See Figures 12-14 As shown, the gas purification system 10 includes a bypass pipeline 900, a raw material gas inlet valve group 13, a purified gas outlet valve group 14, a bypass valve group 15, and a regenerated gas outlet valve group 16.

[0090] The raw gas inlet valve assembly 13 is located at the inlet end of the raw gas supply pipe 100, and the purified gas outlet valve assembly 14 is located at the outlet end of the purified gas output pipe 500. The inlet end of the bypass pipe 900 is connected to the upstream of the raw gas inlet valve assembly 13, and the outlet end of the bypass pipe 900 is connected to the downstream of the purified gas outlet valve assembly 14.

[0091] The regenerated gas outlet valve assembly 16 is located at the outlet end of the regenerated gas output pipeline 800, and the inlet gas selection component 200 is connected to the upstream of the regenerated gas outlet valve assembly 16; the outlet gas selection component 400 is connected to the upstream of the purified gas outlet valve assembly 14, and the connection position between the inlet end of the cooling unit 600 and the purified gas output pipeline 500 is located downstream of the outlet gas selection component 400 and upstream of the purified gas outlet valve assembly 14.

[0092] In the manner described above, when the adsorption tower 300 can normally switch between the adsorption section adsorption tower 30a, the heating section adsorption tower 30b, and the cooling section adsorption tower 30c, the bypass valve group 15 can be closed while the raw material gas inlet valve group 13, the purified gas outlet valve group 14, and the regenerated gas outlet valve group 16 are opened. This allows the adsorption section adsorption tower 30a to continuously adsorb impurities in the raw material gas, converting the raw material gas into purified gas for output. In the event of a malfunction in the adsorption tower 300, the cooling unit 600, and / or the heating unit 700, the bypass valve group 15 can be temporarily opened while the raw material gas inlet valve group 13, the purified gas outlet valve group 14, and the regenerated gas outlet valve group 16 are closed, allowing the raw material gas to be output through the bypass pipeline 900.

[0093] In this way, although the impurities in the raw gas output through the bypass pipeline 900 are not treated by the adsorption tower 300, the gas purification system 10 can meet the temporary gas demand when maintenance is required.

[0094] Optionally, combined Figure 1 See Figures 12-14As shown, the raw gas inlet valve group 13, the purified gas outlet valve group 14, the bypass valve group 15, and the regenerated gas outlet valve group 16 can all include valves that can switch between open and closed states.

[0095] For example, rather than limiting, in combination Figure 1 See Figures 12-14 As shown, the bypass valve group 15 and the regenerated gas outlet valve group 16 may each include a first electric metal-sealed butterfly valve a1, a first electric sector blind valve a2 and a second electric metal-sealed butterfly valve a3 connected in sequence, but are not limited thereto.

[0096] For example, rather than limiting, in combination Figure 1 See Figures 12-14 As shown, both the raw gas inlet valve group 13 and the purified gas outlet valve group 14 may include a third electrically operated metal-sealed butterfly valve b1 and a second electrically operated sector blind valve b2 connected in series. Specifically, in the raw gas inlet valve group 13, the second electrically operated sector blind valve b2 is located downstream of the third electrically operated metal-sealed butterfly valve b1. In the purified gas outlet valve group 14, the second electrically operated sector blind valve b2 is located upstream of the third electrically operated metal-sealed butterfly valve b1, but this is not a limitation.

[0097] Optionally, combined Figure 1 See Figure 12 As shown, a first branch 1100 and a second branch 1200 are connected in parallel between the raw gas inlet valve group 13 and the gas-liquid separator 1000. The first branch 1100 is equipped with a third manual valve 1110, a first automatic flow regulating valve 1120, and a fourth manual valve 1130 connected in series. The second branch 1200 is equipped with a fifth manual valve 1210.

[0098] Using the above method, either the first branch 1100 or the second branch 1200 can be selected as needed. For example, when the first automatic flow regulating valve 1120 is functioning normally, the third manual valve 1110 and the fourth manual valve 1130 are opened, and the fifth manual valve 1210 is closed, so that the first automatic flow regulating valve 1120 can be used to automatically regulate the flow rate into the gas-liquid separator 1000. For example, if the first automatic flow regulating valve 1120 is damaged, the third manual valve 1110 and the fourth manual valve 1130 are temporarily closed, and the fifth manual valve 1210 is opened, so that the flow rate into the gas-liquid separator 1000 can be manually regulated through the fifth manual valve 1210.

[0099] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A gas purification system, characterized by, The gas purification system includes a raw gas supply pipeline, N adsorption towers, an inlet gas selection component, an outlet gas selection component, a purified gas output pipeline, a cooling unit, a heating unit, and a regenerated gas output pipeline; N is an integer, and N≥4; The air intake selection assembly is connected to the raw material gas supply pipeline, the air intake ends of N adsorption towers, the air intake end of the heating unit, and the regeneration gas output pipeline, respectively. The gas outlet selection component is connected to the gas outlets of N adsorption towers, the purified gas output pipeline, the gas outlet of the cooling unit, and the gas outlet of the heating unit, respectively; the gas inlet of the cooling unit is connected to the purified gas output pipeline. The outlet gas selection component and the inlet gas selection component can divide the N adsorption towers into adsorption section adsorption towers, cooling section adsorption towers and heating section adsorption towers, and switch between the adsorption section adsorption towers, the heating section adsorption towers and the cooling section adsorption towers alternately; the raw material gas supply pipe, the adsorption section adsorption towers, the purified gas output pipe, the cooling unit, the cooling section adsorption towers, the heating unit, the heating section adsorption towers and the regeneration gas output pipe are connected in sequence.

2. The gas purification system of claim 1, wherein, The cooling unit includes: A water cooler, wherein the air inlet of the water cooler is connected to the purified gas output pipeline, and the air outlet of the water cooler is connected to the air outlet selection component; The water cooler is used to receive part of the purified gas output from the adsorption section of the adsorption tower as regeneration gas, and after cooling the regeneration gas, it is passed in reverse through the outlet gas selection component to the cooling section of the adsorption tower, so that the cooling section of the adsorption tower is cooled and re-adsorbed.

3. The gas purification system according to claim 2, characterized in that, The cooling unit includes: A pressurizing fan, wherein the air inlet of the pressurizing fan is connected to the purified air output pipeline, and the air outlet of the pressurizing fan is connected to the air inlet of the water cooler; The pressurizing fan is used to receive part of the purified gas output from the adsorption tower of the adsorption section as regeneration gas and pressurize the regeneration gas; the water cooler receives the pressurized regeneration gas.

4. The gas purification system according to claim 1, characterized in that, The heating unit includes: A heater, wherein the inlet end of the heater is connected to the inlet selection component, and the outlet end of the heater is connected to the outlet selection component; The heater is used to receive the regenerated gas after it has passed through the cooling section adsorption tower in reverse, and to heat the regenerated gas and then pass it through the outlet gas selection component in reverse through the heating section adsorption tower, so that the heating section adsorption tower is heated and desorbed.

5. The gas purification system according to claim 4, characterized in that, The heater is a steam heater, which has: a steam inlet, a condensate outlet, a heating inlet, and a heating outlet; The steam inlet is used to receive heating steam, and the heating inlet is used to receive the regenerated gas after it has passed through the cooling adsorption tower in the reverse direction; the condensate outlet is used to output the condensate formed by the heating steam after cooling; the heating outlet is connected to the gas outlet selection component and is used to output the regenerated gas heated by the heating steam to the gas outlet selection component.

6. The gas purification system according to claim 5, characterized in that, The cooling unit includes: A water cooler, wherein the air inlet of the water cooler is connected to the purified gas output pipeline, and the air outlet of the water cooler is connected to the air outlet selection component; The water cooler is used to receive part of the purified gas output from the adsorption section of the adsorption tower as regeneration gas and cool the regeneration gas before passing it in reverse through the outlet gas selection component to the cooling section of the adsorption tower, so that the cooling section of the adsorption tower cools down and re-adsorbs. The heating unit includes a condensate delivery pipeline, and the cooling unit includes a cooling water inlet pipeline and a cooling water return pipeline; The inlet end of the condensate delivery pipeline is connected to the condensate outlet, and the outlet end of the condensate delivery pipeline is connected to the cooling water return pipeline. The outlet end of the cooling water inlet pipe is connected to the inlet end of the water cooler, and the cooling water return pipe is connected to the return end of the water cooler.

7. The gas purification system according to claim 6, characterized in that, The condensate delivery pipeline includes a back pressure pipeline and a drain pipeline; The parallel back pressure pipeline and the drain pipeline are connected in series between the inlet end of the condensate delivery pipeline and the outlet end of the condensate delivery pipeline. The back pressure pipeline is equipped with a back pressure valve, a first on / off valve, and a second on / off valve; the back pressure valve is connected in series between the first on / off valve and the second on / off valve; the drain pipeline is equipped with a drain valve.

8. The gas purification system according to claim 1, characterized in that, The intake gating component includes: N first selector valves correspond one-to-one with N adsorption towers. Each first selector valve is connected to the inlet of the corresponding adsorption tower and the raw material gas supply pipeline to switch the connection state and the blockage state between the inlet of the corresponding adsorption tower and the raw material gas supply pipeline. N second selector valves correspond one-to-one with N adsorption towers. Each second selector valve is connected to the air inlet of the corresponding adsorption tower and the air inlet of the heating unit to switch the connection state and the blockage state between the air inlet of the corresponding adsorption tower and the air inlet of the heating unit. And N third selector valves, each corresponding to one of the N adsorption towers. Each third selector valve is connected to the inlet of the corresponding adsorption tower and the regeneration gas output pipeline to switch the connection state and the blockage state between the inlet of the corresponding adsorption tower and the regeneration gas output pipeline.

9. The gas purification system according to claim 1, characterized in that, The air outlet selection component includes: N fourth selector valves correspond one-to-one with N adsorption towers. Each fourth selector valve is connected to the outlet of the corresponding adsorption tower and the purified gas output pipeline to switch the connection state and the blockage state between the outlet of the corresponding adsorption tower and the purified gas output pipeline. N fifth selector valves correspond one-to-one with N adsorption towers. Each fifth selector valve is connected to the outlet of the corresponding adsorption tower and the outlet of the cooling unit to switch the connection state and the blockage state between the outlet of the corresponding adsorption tower and the outlet of the cooling unit. And N sixth selector valves, each corresponding to one of the N adsorption towers. Each sixth selector valve is connected to the outlet of the corresponding adsorption tower and the outlet of the heating unit to switch the connection and blockage states between the outlet of the corresponding adsorption tower and the outlet of the heating unit.

10. The gas purification system according to claim 1, characterized in that, The gas purification system includes a gas-liquid separation device connected in series with the raw material gas supply pipeline.

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