CN210544391U - Device for treating pressure swing adsorption decarbonization exhaust gas by catalytic oxidation - Google Patents
Device for treating pressure swing adsorption decarbonization exhaust gas by catalytic oxidation Download PDFInfo
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Abstract
The utility model discloses a device for treating pressure swing adsorption decarbonization exhaust gas by catalytic oxidation, which contains CO and VOCS、H2、CO2And sulfide, etc. are connected with an air pipe to form a mixed air pipe; the mixed gas pipe is connected with the cold phase inlet of the heat exchanger, and the cold phase and the hot phase of the heat exchanger are subjected to counter-current heat exchangeHeating; the cold phase outlet pipe is connected with the inlet of the heater and is heated to the required temperature; the outlet pipeline of the heater is connected with the inlet of the desulfurizing tower, and the total sulfur content of the desulfurized gas is less than or equal to 0.1mg/Nm3(ii) a The outlet pipeline of the desulfurizing tower is connected with the inlet of the catalytic oxidation reactor, and oxidation reaction is carried out in the catalytic oxidation reactor to generate H2O and CO2The content of non-methane total hydrocarbon in the outlet gas after the reaction in the catalytic oxidation reactor is less than or equal to 60mg/m3CO content is less than or equal to 1000mg/Nm3The emission standard is reached; the outlet pipeline of the catalytic oxidation reactor is connected with the hot phase inlet of the heat exchanger, and the hot phase outlet is connected to the emptying pipeline for emptying. The device can effectively solve the problem that the environmental protection of the exhaust gas does not reach the standard, and can be used for treating the pressure swing adsorption decarbonization exhaust gas.
Description
Technical Field
The utility model belongs to the technical field of gas separation, especially, relate to a device of catalytic oxidation treatment pressure swing adsorption decarbonization exhaust.
Background
With the deep progress of ecological civilization construction in China, environmental pollution becomes the most concerned topic of people at present, and the requirement for environmental management is higher and higher. The pressure swing adsorption gas adsorption separation technology is widely applied to gas recovery and purification in industries such as steel, gas, electronics, petroleum, chemical engineering and the like, the pressure swing adsorption is used as a gas purification device, adsorption and regeneration are realized by means of pressure change, and a large amount of exhaust gas (reverse gas release and air extraction by analysis) can be generated in the regeneration process.
The pressure swing adsorption decarbonization device discharges gas containing high concentration CO2And a small amount of harmful gases such as CO, VOCs, sulfides, and the like. VOCs (volatile organic compounds) Belongs to volatile organic compounds, most VOCs (volatile organic compounds) have toxicological properties, and some VOCs also have stronger photochemical reaction activity to cause O3An important precursor of pollution, and the products of its atmospheric chemical reactions are important components in fine particulate matter, and also important precursors leading to dust-haze weather. Visible VOCSHas very important promotion effect on the formation of composite air pollution, and can be used for promoting the formation of composite air pollution along with the continuous improvement of the environmental protection requirement of ChinaVolatile Organic Compounds (VOCs)S) Emission restrictions are becoming more stringent, with respect to VOCsSNeeds to be subjected to harmless treatment to meet the regulation requirements of national standard of air pollutant comprehensive emission standard (GB 16297 and newly-released local standard), and the concentration of non-methane total hydrocarbon is reduced to 120mg/Nm3And then, the exhaust to the atmosphere is possible. The sulfide not only causes poisoning of the catalyst in the downstream process and corrosion of equipment, but also pollutes the environment when being discharged into the atmosphere, so that the sulfide needs to be removed before entering the downstream process. CO (carbon monoxide) is a toxic, flammable and explosive gas, is very easily combined with hemoglobin, and has fatal damage to human beings and animals when the content of CO in the air is 2.0 x 10-5At mol/L, people will have dizziness and vomiting within two hours, and when the content reaches 1.2%, people will die within 1-3min, so CO is one of six basic pollutant control items in the environmental air quality Standard of China, and the elimination of CO pollution has important practical significance for human health. For this reason, governments in various places can control CO and VOC in the comprehensive emission standard of air pollutantsSThe emission of the sulfide is strictly regulated, such as DB11/501-2017 of Beijing, DB31/933-2015 of Shanghai, DB13/487-2002 of Hebei and the like, the maximum allowable emission concentration of CO is limited to 1000mg/Nm3The concentration of non-methane total hydrocarbons is reduced to 120mg/Nm3The following.
The reverse air discharge pipeline of the existing pressure swing adsorption decarburization production device is directly discharged to the sky, and the CO in the air is directly discharged if the analysis pumping air is not recycled2、CO、VOCSGases such as sulfide cause pollution of the surrounding environment, and the reverse air release and air extraction are not discharged together. Therefore, it is important to solve the problem of exhaust gas pollution.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the utility model discloses an adopt a catalytic oxidation to handle the device of pressure swing adsorption decarbonization device exhaust, concrete technical scheme is:
an apparatus for treating pressure swing adsorption decarbonized exhaust gas by catalytic oxidation, the apparatus comprising:
a mixing part, a gas-gas heat exchanger (9), a heater (10), a reaction part and an emptying cylinder (13);
wherein the cold phase inlet of the gas-gas heat exchanger (9) is connected with the mixing part through a mixed gas pipe A (3), and the cold phase outlet of the gas-gas heat exchanger (9) is connected with the inlet of the heater (10) through a mixed gas pipe B (4);
an outlet of the heater (10) is connected with an inlet of the reaction part through a mixed gas pipe C (5), and then is connected with a hot phase reaction inlet of the gas-gas heat exchanger (9) through an outlet of the reaction part through a mixed gas pipe E (7);
the hot phase reaction outlet of the gas-gas heat exchanger (9) is connected with the emptying cylinder (13) through a mixed gas pipe F (8).
Furthermore, the mixing part comprises a pressure swing adsorption decarbonization device exhaust gas main pipe (1) and an air pipe (2), and an outlet of the pressure swing adsorption decarbonization device exhaust gas main pipe (1) and an outlet of the air pipe (2) are converged by a mixed air pipe A (3) and then connected with a cold phase inlet of the air-gas heat exchanger (9).
Further, the reaction part comprises a desulfurizing tower (11) and a catalytic oxidation reactor (12);
wherein the inlet of the desulfurizing tower (11) is connected with the outlet of the heater (10) through a mixed gas pipe C (5), the outlet of the desulfurizing tower (11) is connected with the inlet of the catalytic oxidation reactor (12) through a mixed gas pipe D (6), and the outlet of the catalytic oxidation reactor (12) is connected with the hot phase inlet of the gas-gas heat exchanger (9) through a mixed gas pipe E (7).
Furthermore, a temperature measuring point A (20) is arranged on the part of a mixed gas pipe B (4) where the gas-gas heat exchanger (9) is connected with the heater (10).
Furthermore, a temperature measuring point B (21) is arranged at the part of the mixed gas pipe C (5) where the heater (10) is connected with the desulfurizing tower (11).
Furthermore, a temperature measuring point C (23) and an online analyzer A (19) for CO, VOCs and H2 are sequentially arranged on a mixed gas pipe E (7) connected with the catalytic oxidation reactor (12) and the gas-gas heat exchanger (9).
Furthermore, a mixed gas pipe F (8) connected with the gas-gas heat exchanger (9) and the emptying cylinder (13) is sequentially provided with a control valve D (18) and a temperature measuring point D (25).
Furthermore, a mixed gas pipe D (6) part of the desulfurizing tower (11) connected with the catalytic oxidation reactor (12) is provided with a sulfide online analyzer (22).
Further, a mixed gas pipe A (3) connected with the gas-gas heat exchanger (9) of the pressure swing adsorption decarbonization device exhaust gas main pipe (1) is sequentially provided with a CO, VOCs, H2 online analyzer B (24) and a control valve A (15);
the main gas pipe (1) and the air pipe (2) of the pressure swing adsorption decarbonization device are respectively provided with a control valve A (15) and a control valve B (16) before being converged;
the front ends of the control valve A (15) and the control valve B (16) are also provided with an air regulating valve (14) which is connected with CO, VOCs and H2The on-line analyzer A (19) forms a chain, and the air regulating valve (14) is respectively connected with the two ends of the main exhaust gas pipe (1) and the air pipe (2) of the pressure swing adsorption decarbonization device.
Furthermore, a control valve C (17) is connected between the pressure swing adsorption decarbonization device exhaust gas main pipe (1) and the air regulating valve (14), and the control valve C (17) is connected with the mixed gas pipe F (8) and is positioned behind the temperature measuring point D (25).
The beneficial effects of the utility model reside in that:
the utility model provides a new device for treating the exhaust gas of a pressure swing adsorption decarbonization device by catalytic oxidation, which solves the problem that the exhaust gas of the pressure swing adsorption decarbonization device in the prior art can not reach the emission standard. The device has the advantage that the gas discharged by the pressure swing adsorption decarbonization device can be discharged continuously and stably up to the standard, and the total sulfur content of the discharged gas is less than or equal to 0.1mg/Nm3The content of non-methane total hydrocarbons is less than or equal to 60mg/Nm3CO content less than or equal to 1000mg/Nm3Has better technical effect.
Drawings
Fig. 1 is a schematic flow diagram of the device of the present invention.
In FIG. 1, 1-pressure swing adsorptionThe method comprises the following steps of (1) discharging a main gas pipe of a decarbonizing device, 2-an air pipe, 3-a mixed gas pipe A, 4-a mixed gas pipe B, 5-a mixed gas pipe C, 6-a mixed gas pipe D, 7-a mixed gas pipe E, 8-a mixed gas pipe F, 9-a gas-gas heat exchanger, 10-a heater, 11-a desulfurizing tower, 12-a catalytic oxidation reactor, 13-an emptying cylinder, 14-an air regulating valve, 15-a control valve A, 16-a control valve B, 17-a control valve C, 18-a control valve D, 19-CO, VOCs, H2On-line analyzer A, 20-temperature measuring point A, 21-temperature measuring point B, 22-sulfide on-line analyzer, 23-temperature measuring point C, 24-CO, VOCs and H2And (4) an online analyzer B, 25-temperature measuring point D.
Detailed Description
In order to deepen the understanding of the present invention, the following embodiments will be combined to make the present invention do further details, and the present embodiment is only used for explaining the present invention, and does not constitute the limitation of the protection scope of the present invention.
Example 1
As shown in FIG. 1, the present embodiment provides a pressure swing adsorption decarbonization apparatus for removing CO and VOC from the exhaust gasSAnd a sulfide purification device:
in the presence of CO and VOCS、H2、CO2And the main gas pipe (1) of the pressure swing adsorption decarbonization device for sulfides and the like is provided with CO, VOCs and H2An air regulating valve (14) is arranged on the air pipe (2) of the on-line analyzer A (19) and is connected with CO, VOCs and H2The on-line analyzer A (19) forms a chain according to CO, VOCs and H2CO, VOC obtained by on-line analyzer A (19)S、H2The content automatically adjusts the opening degree of the air adjusting valve (14) so as to control the air quantity and the reaction temperature entering the catalytic oxidation reactor (12) and ensure the safe and stable operation of the catalytic oxidation reactor (12).
The main gas pipe (1) of the pressure swing adsorption decarbonization device and the calculation distribution air pipe (2) are evenly mixed and enter a gas-gas heat exchanger (9) through a control valve A (15) and a mixed gas pipe A (3), and the mixed gas and the gas from a catalytic oxidation reactor (9) are subjected to CO and VOC removalS、H2The treated reaction gas is conveyed to a gas-gas heat exchanger (9) through a mixed gas pipe E (7) for gas heat exchange.
After heat exchange, gas enters a heater (10) for heating through a mixed gas pipe B (4), a temperature measuring point A (20) is arranged on the mixed gas pipe B (4), a temperature measuring point B (21) is arranged on a mixed gas pipe C (5), the heater (10) controls the temperature of the temperature measuring point B (21) through electric heating, the heater (10) is required to be adopted to heat the gas at the initial operation stage, after the catalytic oxidation reactor (12) normally operates, the heater (10) can automatically turn off heating, and the gas heat exchanger (9) is used for heating to maintain the normal operation of the catalytic oxidation reactor (12). The gas heater (10) is heated to the required temperature and then is introduced into the desulfurizing tower (11) through the mixed gas pipe C (5) for desulfurization, and the total sulfur content of the desulfurized gas is less than or equal to 0.1mg/Nm3The desulfurized gas enters a catalytic oxidation reactor (12) through a mixed gas pipe D (6) to be subjected to oxidation reaction to generate H2O and CO2The mixed gas pipe E (7) at the outlet of the catalytic oxidation reactor (12) is provided with CO, VOCs and H2An on-line analyzer B (24), a temperature measuring point C (23), and CO, VOCs and H monitoring2The conversion rate and the reaction temperature of the catalytic oxidation reaction are controlled to ensure that the content of the gas non-methane total hydrocarbon after the reaction is less than or equal to 60mg/Nm3The content of CO is less than or equal to 1000mg/Nm3. The outlet gas of the catalytic oxidation reactor (12) enters the gas-gas heat exchanger (9) through the mixed gas pipe E (7) to exchange heat with the pressure swing adsorption decarburization exhaust gas flowing out of the mixed gas pipe A (3), enters the emptying cylinder (13) through the mixed gas pipe F (8) and the control valve D (18) after heat exchange to be discharged at high altitude, and a temperature measuring point D (25) is arranged on the mixed gas pipe E (7) and used for monitoring the heat exchange efficiency of the heat exchanger and regulating and controlling the temperature of the temperature measuring point A (20). When the catalytic oxidation reactor (12) is shut down for maintenance and catalyst replacement, and the system needs air replacement, the air regulating valve (14), the control valve A (15) and the control valve C (17) are closed, the control valve B (16) and the control valve D (18) are opened, and the opening degree of the control valve B (16) is adjusted to adjust the air quantity. When CO, VOCs and H arranged on the main gas pipe (1) of the pressure swing adsorption decarbonization device2CO, VOC obtained by on-line analyzer A (19)SSulfide, H2When the content reaches the emission standard, the valve of the air regulating valve (14) is closed and controlledThe valve A (15) and the control valve D (18) are controlled, and the control valve C (17) is opened to directly discharge.
Taking the reverse vent gas discharged by the pressure swing adsorption decarbonization device as an example, the reverse vent gas flow is 20336.844 Nm3The composition and flow are shown in Table 1, at a pressure of 10 kPa.g and a temperature of 32 ℃.
Table 1, treatment of reverse bleed gas composition and quantity:
adopt the utility model discloses a device of CO in catalytic oxidation treatment pressure swing adsorption decarbonization exhaust gas, control gas heat exchanger (9) operating temperature is 330 ℃, heater (10) operating temperature is 160 ℃, catalytic oxidation reactor (12) operating temperature is 380 ℃, control operating pressure is 5 kPa.g. The catalyst is a platinum noble metal honeycomb catalyst, and the desulfurizer is a zinc oxide fine desulfurizer. Thereby treating CO and VOC by desulfurization and catalytic oxidation reactionSThe pressure swing adsorption decarbonization exhaust gas of sulfide has the CO removal rate of more than 97 percent and VOCSThe removal rate is more than 96.5 percent, the removal rate of sulfide is more than 99.9 percent, and the average value of the CO content in the treated exhaust gas is 800mg/Nm3The average total sulfur content was 0.06mg/Nm3The average non-methane total hydrocarbon content was 55mg/Nm3And can be directly discharged from high altitude through the exhaust funnel.
Example 2
According to the device described in the embodiment 1, the desorption gas discharged from the pressure swing adsorption decarbonization device enters the catalytic oxidation CO removing device, the pressure of the desorption gas is 6 kPa.g, the temperature is 30 ℃, and the composition and the flow rate are shown in the table 2.
Table 2, treatment of reverse bleed gas composition and quantity:
adopt the device of the catalytic oxidation treatment pressure swing adsorption decarbonization exhaust gas CO of the utility model, control the gas-gas heat exchanger9) The operation temperature is 300 ℃, the operation temperature of the heater (10) is 200 ℃, the operation temperature of the catalytic oxidation reactor (12) is 330 ℃, and the operation pressure is controlled to be 5kPa. The catalyst is a palladium noble metal honeycomb catalyst, and the desulfurizer is a combination of a hydrolysis desulfurization catalyst and a ferric oxide and zinc oxide fine desulfurizer. Thereby treating CO and VOC by desulfurization and catalytic oxidation reactionSThe pressure swing adsorption decarbonization desorption gas of the sulfide has the CO removal rate of more than 96.5 percent and VOCSThe removal rate is more than 97.7 percent, the removal rate of sulfide is more than 99.9 percent, and the average value of the CO content in the treated exhaust gas is 600mg/Nm3The average total sulfur content was 0.1mg/Nm3The average non-methane total hydrocarbon concentration was 58mg/Nm3And can be directly discharged from high altitude through the exhaust funnel.
Example 3
According to the device described in the embodiment 1, the desorption gas and the reverse vent gas discharged from the pressure swing adsorption decarbonization device are mixed, and the mixed exhaust gas enters the catalytic oxidation CO removing device, the pressure of the exhaust gas is 8kPa.g, the temperature is 30 ℃, and the composition and the flow rate are shown in Table 3.
Table 3 handles reverse bleed composition and quantity:
adopt the utility model discloses a device of CO in catalytic oxidation treatment pressure swing adsorption decarbonization exhaust gas, control gas heat exchanger (9) operating temperature is 330 ℃, heater (10) operating temperature is 250 ℃, catalytic oxidation reactor (12) operating temperature is 375 ℃, and control operating pressure is 5 kPa.g. The catalyst is 55% platinum and 45% palladium noble metal honeycomb catalyst, and the desulfurizer is a combination of cobalt-molybdenum hydrodesulfurization catalyst and ferric oxide and zinc oxide fine desulfurizer. Thereby treating CO and VOC by desulfurization and catalytic oxidation reactionSThe pressure swing adsorption decarbonization exhaust gas (reverse exhaust gas and desorption gas) of the sulfide has the CO removal rate of over 95.6 percent and VOCSThe removal rate is more than 97.7 percent, the removal rate of sulfide is more than 99.9 percent, and the average value of the CO content in the treated exhaust gas is 950mg/Nm3The average total sulfur content was 0.08mg/Nm3The average non-methane total hydrocarbon content was 52mg/Nm3And can be directly discharged from high altitude through the exhaust funnel.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An apparatus for treating pressure swing adsorption decarbonized exhaust gas by catalytic oxidation, comprising:
a mixing part, a gas-gas heat exchanger (9), a heater (10), a reaction part and an emptying cylinder (13);
wherein the cold phase inlet of the gas-gas heat exchanger (9) is connected with the mixing part through a mixed gas pipe A (3), and the cold phase outlet of the gas-gas heat exchanger (9) is connected with the inlet of the heater (10) through a mixed gas pipe B (4);
an outlet of the heater (10) is connected with an inlet of the reaction part through a mixed gas pipe C (5), and then is connected with a hot phase reaction inlet of the gas-gas heat exchanger (9) through an outlet of the reaction part through a mixed gas pipe E (7);
the hot phase reaction outlet of the gas-gas heat exchanger (9) is connected with the emptying cylinder (13) through a mixed gas pipe F (8).
2. The device according to claim 1, wherein the mixing part comprises a pressure swing adsorption decarbonization device exhaust gas main pipe (1) and an air pipe (2), and an outlet of the pressure swing adsorption decarbonization device exhaust gas main pipe (1) and an outlet of the air pipe (2) are converged by a mixed air pipe A (3) and then are connected with a cold phase inlet of the gas-gas heat exchanger (9).
3. The apparatus according to claim 1, wherein the reaction section comprises a desulfurization tower (11) and a catalytic oxidation reactor (12);
wherein the inlet of the desulfurizing tower (11) is connected with the outlet of the heater (10) through a mixed gas pipe C (5), the outlet of the desulfurizing tower (11) is connected with the inlet of the catalytic oxidation reactor (12) through a mixed gas pipe D (6), and the outlet of the catalytic oxidation reactor (12) is connected with the hot phase inlet of the gas-gas heat exchanger (9) through a mixed gas pipe E (7).
4. The device according to claim 1, characterized in that the portion of the mixed gas pipe B (4) where the gas-gas heat exchanger (9) is connected to the heater (10) is provided with a temperature measuring point A (20).
5. The apparatus according to claim 3, wherein the portion of the mixed gas pipe C (5) where the heater (10) is connected to the desulfurizing tower (11) is provided with a temperature measuring point B (21).
6. The apparatus according to claim 3, characterized in that the mixed gas pipe E (7) connecting the catalytic oxidation reactor (12) and the gas-gas heat exchanger (9) is provided with a temperature measuring point C (23), CO, VOCs and H2On-line analyzer A (19).
7. The device according to claim 1, characterized in that the mixed gas pipe F (8) part of the gas-gas heat exchanger (9) connected with the blow-down drum (13) is provided with a control valve D (18) and a temperature measuring point D (25) in sequence.
8. The apparatus according to claim 3 or 5, characterized in that the mixed gas pipe D (6) connected with the catalytic oxidation reactor (12) of the desulfurization tower (11) is provided with an on-line sulfide analyzer (22).
9. The device according to claim 2, characterized in that the mixed gas pipe A (3) of the main gas pipe (1) of the pressure swing adsorption decarbonization device and the gas-gas heat exchanger (9) is provided with CO, VOCs and H in sequence2An on-line analyzer B (24), a control valve A (15);
the main gas pipe (1) and the air pipe (2) of the pressure swing adsorption decarbonization device are respectively provided with a control valve A (15) and a control valve B (16) before being converged;
the front ends of the control valve A (15) and the control valve B (16) are also provided with an air regulating valve (14) which is connected with CO, VOCs and H2The on-line analyzer A (19) forms a chain, and the air regulating valve (14) is respectively connected with the two ends of the main exhaust gas pipe (1) and the air pipe (2) of the pressure swing adsorption decarbonization device.
10. The apparatus according to claim 9, wherein a control valve C (17) is connected between the main gas pipe (1) and the air regulating valve (14), and the control valve C (17) is connected with the mixed gas pipe F (8) and is positioned behind the temperature measuring point D (25).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117865422A (en) * | 2024-03-13 | 2024-04-12 | 杭州水处理技术研究开发中心有限公司 | Treatment process and system for softening high-salt negative hard wastewater and volatile organic compounds |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117865422A (en) * | 2024-03-13 | 2024-04-12 | 杭州水处理技术研究开发中心有限公司 | Treatment process and system for softening high-salt negative hard wastewater and volatile organic compounds |
| CN117865422B (en) * | 2024-03-13 | 2024-05-28 | 杭州水处理技术研究开发中心有限公司 | Treatment process and system for softening high-salt negative hard wastewater and volatile organic compounds |
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