CN215863459U - Organic waste gas grading temperature control catalytic oxidation treatment device - Google Patents
Organic waste gas grading temperature control catalytic oxidation treatment device Download PDFInfo
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- CN215863459U CN215863459U CN202121682357.4U CN202121682357U CN215863459U CN 215863459 U CN215863459 U CN 215863459U CN 202121682357 U CN202121682357 U CN 202121682357U CN 215863459 U CN215863459 U CN 215863459U
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Abstract
The utility model discloses an organic waste gas grading temperature control catalytic oxidation device, which comprises an organic waste gas conveying fan, an inlet flame arrester, a gas-liquid separator, a desulfurization tank, a primary filter, a pipeline mixer, an LEL concentration analyzer, a sulfur content analyzer, a buffer tank and a secondary filter which are sequentially communicated; the outlet of the secondary filter is divided into two paths, one path is connected with the heat exchanger through a main path valve, and the other path is sequentially connected with a sulfur content analyzer and an exhaust funnel through a bypass valve; one path of the heat exchanger is connected with the exhaust funnel, the other path of the heat exchanger is connected with the first-stage electric heating reactor, one path of the first-stage electric heating reactor is connected with the second-stage electric heating reactor, the other path of the first-stage electric heating reactor is connected with a pipeline between the heat exchanger and the exhaust funnel through the first-stage bypass valve, and the pipeline is also connected with a pipeline between the second-stage electric heating reactor and the heat exchanger through the second-stage bypass valve; the pipeline mixer is also connected with an air supplementing fan. The device treats a large amount of VOCs waste gas of storage tanks and automobile loading platforms in the petrochemical industry.
Description
Technical Field
The utility model belongs to the field of organic waste gas treatment, and particularly relates to a device for treating organic waste gas by stage temperature control catalytic oxidation.
Background
The organic waste gas generated in petrochemical industry mainly contains heavy oil such as fuel oil (light oil), wax, grease and the like, and tailings such as asphalt, tar and the like, has the characteristics of complex components, flammability, explosiveness, difficulty in treatment and the like, and is a difficult point in the organic waste gas treatment industry. Due to high concentration, flammability and explosiveness of petrochemical waste gas and high requirements of petrochemical industry on explosion prevention and fire prevention of devices (open fire is not allowed in a furnace and high temperature exceeding the burning point of organic components is not allowed), the organic waste gas in the petrochemical industry can be treated almost only by adopting catalytic oxidation technology at present, but the traditional catalytic oxidation has poor treatment effect on the petrochemical organic waste gas because the waste gas has complex components, namely fuel oil (light oil) components which are easy to oxidize and heavy oil and tailings components which are difficult to oxidize. The proposed patent of the company mainly aims at the characteristic of complex components of the waste gas in the petrochemical tank field, and adopts the technology of absorbing hydrogen sulfide by a desulfurization adsorbent, carrying out primary oxidation treatment on fuel oil and heavy oil, and carrying out secondary oxidation treatment on stubborn tailings components to treat all components in the waste gas to reach the standard. Organic waste gas in the atmosphere exceeds a certain concentration, which is not only harmful to human health directly, but also can generate photochemical smog through sunlight irradiation under certain conditions, thus causing harm to the environment and human beings.
Chinese patent CN107213769B discloses a hierarchical catalytic oxidation treatment device for organic waste gas, and the existing implementation scheme is mainly a first-level catalytic oxidation device, which cannot effectively control the catalytic combustion temperature of organic waste gas, and is difficult to treat some stubborn organic components with high burning point, and finally difficult to reach the emission concentration standard of organic waste gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for treating organic waste gas by stage temperature control catalytic oxidation, which is used for treating a large amount of VOCs waste gas in a storage tank and an automobile loading platform in the petrochemical industry.
The technical solution for realizing the purpose of the utility model is as follows:
a device for graded temperature control catalytic oxidation of organic waste gas comprises an organic waste gas conveying fan, an inlet flame arrester, a gas-liquid separator, a desulfurizing tank, a primary filter, a pipeline mixer, an LEL concentration analyzer, a sulfur content analyzer, a buffer tank and a secondary filter which are sequentially communicated;
the outlet of the secondary filter is divided into two paths, one path is connected with the heat exchanger through a main path valve, and the other path is sequentially connected with an outlet flame arrester and an exhaust funnel through a bypass valve; the outlet of the hot side of the heat exchanger is connected with an exhaust funnel, the outlet of the cold side of the heat exchanger is connected with a primary electric heating reactor, one path of the primary electric heating reactor is connected with a secondary electric heating reactor, the outlet of the secondary electric heating reactor is connected with the heat exchanger, the other path of the secondary electric heating reactor is connected with a pipeline between the heat exchanger and the exhaust funnel through a primary bypass valve, and the pipeline is also connected with a pipeline between the secondary electric heating reactor and the heat exchanger through a secondary bypass valve; the pipeline mixer is also connected with an air supplementing fan.
Compared with the prior art, the utility model has the following remarkable advantages:
the technical scheme of the utility model can effectively treat the complex petrochemical waste gas containing inorganic sulfur, organic sulfur, light oil, heavy oil and tailings, and has the key points that firstly, the method takes pretreatment measures of a gas-liquid separator, a desulfurizing tank and a filter to remove interference factors which are not beneficial to catalytic oxidation, such as water, dust, sulfur and the like carried by inlet gas, and then innovatively improves the traditional one-stage catalytic oxidation into two stages, realizes different temperature control of two-stage catalytic reactors, and realizes graded catalytic treatment on the complex petrochemical waste gas containing inorganic sulfur, organic sulfur, light oil, heavy oil and tailings, thereby achieving the full treatment on the complex waste gas components.
Drawings
Fig. 1 is a view showing the overall arrangement of the apparatus.
Detailed Description
The utility model is further described with reference to the following figures and embodiments.
With reference to fig. 1, the organic waste gas graded temperature control catalytic oxidation device comprises an organic waste gas conveying fan, an inlet flame arrester 1, a gas-liquid separator 2, a desulfurization tank, a primary filter, a pipeline mixer 6, an LEL concentration analyzer, a sulfur content analyzer 8, a buffer tank 9 and a secondary filter 10 which are sequentially communicated.
The outlet of the secondary filter 10 is divided into two paths, one path is connected with a heat exchanger 13 through a main path valve 11, and the other path is sequentially connected with an outlet flame arrester 18 and an exhaust funnel 19 through a bypass valve 12; an outlet of the hot side of the heat exchanger 13 is connected with an exhaust gas cylinder 19, an outlet of the cold side of the heat exchanger is connected with a primary electric heating reactor 14, one path of the primary electric heating reactor 14 is connected with a secondary electric heating reactor 15, an outlet of the secondary electric heating reactor 15 is connected with the heat exchanger 13, the other path of the secondary electric heating reactor is connected with a pipeline between the heat exchanger 13 and the exhaust gas cylinder 19 through a primary high-temperature bypass valve 16, and the pipeline is also connected with a pipeline between the secondary electric heating reactor 15 and the heat exchanger 13 through a secondary high-temperature bypass valve 17.
The pipeline mixer 6 is also connected with an air supplementing fan, two air supplementing fans (5-1/5-2) are arranged in the embodiment, and the purpose of the method is to dilute the supplied high-concentration organic waste gas and control the concentration of the waste gas below an explosion limit, so that the safety of the device is ensured.
In the embodiment, two groups of parallel-connected desulfurizing tanks (3-1/3-2) and a primary filter (4-1/4-2) are arranged, the gas-liquid separator 2 is divided into two paths which are respectively connected with the two desulfurizing tanks, and valves are arranged on the two paths of pipelines.
A first rupture disk 20-1 is arranged on the pipeline between the buffer tank 9 and the secondary filter 10, a second rupture disk 20-2 is arranged on the pipeline between the heat exchanger 13 and the primary electric heating reactor 14, and a third rupture disk 20-2 is arranged on the pipeline between the secondary electric heating reactor 15 and the heat exchanger 13.
The organic waste gas staged temperature control catalytic oxidation device of the embodiment is also provided with a nitrogen input pipeline, the nitrogen input pipeline is divided into two paths, one path is connected with the organic waste gas conveying fan and the pipeline of the inlet flame arrester 1, and the other path is connected with the pipeline between the main path valve 11 and the heat exchanger 13.
The system comprises a desulfurizing tank (3-1/3-2), a primary filter (4-1/4-2), an air supplementing fan (5-1/5-2), a pipeline mixer 6, an LEL concentration analyzer (7-1/7-2), a sulfur content analyzer 8, a buffer tank 9, a secondary filter 10, a main path valve 11, a bypass valve 12, a heat exchanger 13, a primary electric heating reactor 14, a secondary electric heating reactor 15, a primary high-temperature bypass valve 16, a secondary high-temperature bypass valve 17, an outlet flame arrester 18, an exhaust funnel 19 and a rupture disc (20-1/20-2/20-3).
Aiming at the characteristic of complex components of the waste gas in the petrochemical tank field, the technology of absorbing hydrogen sulfide by a desulfurization adsorbent, carrying out primary oxidation treatment on fuel oil and heavy oil, and carrying out secondary oxidation treatment on light oil and stubborn tailings components is adopted to treat all the components in the waste gas to reach the standard.
This system device passes through the outer waste gas conveying fan of system and gets into entry spark arrester 1 with the organic waste gas that the composition is complicated earlier through the pipeline, and entry spark arrester 1 adopts two-way pipeline to hinder detonation buckled plate type spark arrester, effectively prevents anterior segment pipeline entering system device after taking place the burning. Normal waste gas reentries vapour and liquid separator 2 again, effectively separates out the liquid drop through inside silk screen demister, guarantees to enter into next stage digester water content, ensures the activity of desulfurizer. Two groups of parallel desulfurization tanks (3-1/3-2) and primary filters (4-1/4-2) are arranged, when one group of desulfurization tanks (3-1) fails, the primary filters (4-1) need to be replaced after resistance is increased, and the other group of desulfurization tanks (3-2) and the primary filters (4-2) are put into a system to operate through a valve switch, so that online replacement of the desulfurizer and the filters is ensured. The desulfurizer in the desulfurizing tank is mainly columnar granular active carbon and is used for absorbing hydrogen sulfide in waste gas, the sulfur content entering a downstream catalytic device is controlled, the catalyst at the rear end is guaranteed to be poisoned due to excessive hydrogen sulfide, the primary filter (4-1/4-2) is mainly used for filtering dust passing through the desulfurizer, and the concentration of the dust also influences the activity of the catalyst. After the waste gas is desulfurized and dedusted, diluting the high-concentration waste gas with air by using an air supply fan (5-1/5-2), detecting the concentration of the organic waste gas by using an LEL concentration analyzer (7-1/7-2), supplying air by using the air supply fan to control the concentration of the waste gas to be below 25% of the lower explosion limit, then feeding the waste gas into a buffer tank 9, and arranging a sulfur content analyzer 8 before the waste gas enters the buffer tank 9 to ensure that the hydrogen sulfide entering a rear-end catalytic device is less than 6 ppm. Waste gas enters a buffer tank 9, the buffer time of the buffer tank 9 meets the reaction action time of all instruments and valves, the concentration of the organic waste gas entering the catalytic reactor is controlled within the lower explosion limit, and hydrogen sulfide entering the reactor is ensured to be less than 6ppm, so that the purpose is to protect the catalyst. As the air supplementing fan (5-1/5-2) sucks air and then carries certain dust, the pipeline after entering the buffer tank 9 is provided with the secondary filter 10 for filtering the dust of the air. And the concentration of the waste gas entering the catalytic heat exchange is controlled within the lower explosion limit, the sulfur content does not exceed the standard, the main path valve 11 is opened after the dust does not exceed the standard, otherwise, the main path valve is closed 11, and the bypass valve 12 is opened for direct discharge. The waste gas meeting the requirements enters the first-stage electric heating reactor 14 after entering the plate heat exchanger 13, in order to save space and optimize arrangement, the electric heater is not provided with a shell independently, the shell is designed together with the first-stage electric heating reactor 14, a heating core is arranged at the upstream, and a catalyst is arranged at the downstream. The waste temperature initially entering the heat exchanger 13 is normal temperature, after the waste heat is heated to 350 ℃ by the heating core of the first-stage electric heating reactor 14, the heat exchanger 13 stops working, the 350 ℃ waste gas enters the catalyst layer to react, fuel oil and heavy oil in the waste heat are treated to release heat, the temperature rise of the waste gas entering the catalyst is low when the concentration of the organic waste gas is low, the temperature of the waste gas entering the catalyst is high when the concentration of the waste gas is high, and the temperature of the waste gas may exceed the bearing temperature of the catalyst, and at this time, the first-stage high-temperature bypass valve 16 is opened to control the temperature of the waste gas entering the second-stage heating reactor 15. When the temperature of the waste gas entering the secondary electric heating reactor 15 is lower than 450 ℃, the secondary heating core needs to be opened to heat the waste gas until 450 ℃, the temperature of the waste gas entering the secondary catalyst is ensured, and light oil and stubborn tailings are removed. And when the secondary reaction outlet is over-heated, a secondary high-temperature bypass valve 17 is opened to control the secondary catalysis temperature, so that the catalyst is protected from being over-heated. The temperature of the exhaust gas outlet of the normal secondary reactor is about 520 ℃, the hot exhaust gas after catalytic combustion enters the plate heat exchanger 13 to heat the cold exhaust gas at the inlet of the plate heat exchanger 13, and the primary electric heating core does not need to be started to operate after the cold exhaust gas is heated to 350 ℃. After entering the plate heat exchanger 13 to heat the cold waste gas, the temperature of the hot waste gas is about 150 ℃, and the hot waste gas enters the outlet flame arrester 18 and is discharged to the exhaust funnel 19 after reaching the standard. The nitrogen in the system is used for purging pipelines, and the compressed air is used for valve control or instrument control. The system device is provided with the rupture disk (20-1/20-2/20-3) according to the specification requirement, so that the system is guaranteed to be decompressed through the rupture disk (20-1/20-2/20-3) after being overpressurized, and the system device is guaranteed to be safe to operate.
Claims (6)
1. The organic waste gas grading temperature control catalytic oxidation device is characterized by comprising an organic waste gas conveying fan, an inlet flame arrester (1), a gas-liquid separator (2), a desulfurizing tank, a primary filter, a pipeline mixer (6), an LEL concentration analyzer (7), a sulfur content analyzer (8), a buffer tank (9) and a secondary filter (10) which are sequentially communicated;
the outlet of the secondary filter (10) is divided into two paths, one path is connected with the heat exchanger (13) through a main path valve (11), and the other path is sequentially connected with an outlet flame arrester (18) and an exhaust funnel (19) through a bypass valve (12); the outlet of the hot side of the heat exchanger (13) is connected with an exhaust funnel (19), the outlet of the cold side of the heat exchanger is connected with a primary electric heating reactor (14), one path of the primary electric heating reactor (14) is connected with a secondary electric heating reactor (15), the outlet of the secondary electric heating reactor (15) is connected with the heat exchanger (13), the other path of the secondary electric heating reactor (15) is connected with a pipeline between the heat exchanger (13) and the exhaust funnel (19) through a primary bypass valve (16), and the pipeline is also connected with a pipeline between the secondary electric heating reactor (15) and the heat exchanger (13) through a secondary bypass valve (17); the pipeline mixer (6) is also connected with an air supplementing fan.
2. The device for graded temperature control catalytic oxidation of organic waste gas according to claim 1, wherein the number of the air supply fans is two.
3. The device for staged temperature-controlled catalytic oxidation of organic waste gas according to claim 1, wherein the gas-liquid separator 2 is divided into two paths, and the two paths are respectively connected with two desulfurization tanks, and valves are arranged on the two paths of pipelines.
4. The device for graded temperature control and catalytic oxidation of organic waste gas as claimed in claim 1, wherein the pipelines of the buffer tank (9) and the secondary filter (10) are provided with a first rupture disk (20-1), the pipelines of the heat exchanger (13) and the primary electric heating reactor (14) are provided with a second rupture disk (20-2), and the pipelines of the secondary electric heating reactor (15) and the heat exchanger (13) are provided with a third rupture disk (20-2).
5. The staged temperature-controlled catalytic oxidation device for organic waste gas according to claim 1, wherein a nitrogen input pipeline is further provided, the nitrogen input pipeline is divided into two paths, one path is connected with the organic waste gas delivery fan and the pipeline of the inlet flame arrester 1, and the other path is connected with the pipeline between the main path valve (11) and the heat exchanger (13).
6. The staged temperature-controlled catalytic oxidation device for organic exhaust gas according to claim 1, wherein the heat exchanger (13) is a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121682357.4U CN215863459U (en) | 2021-07-23 | 2021-07-23 | Organic waste gas grading temperature control catalytic oxidation treatment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121682357.4U CN215863459U (en) | 2021-07-23 | 2021-07-23 | Organic waste gas grading temperature control catalytic oxidation treatment device |
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| CN215863459U true CN215863459U (en) | 2022-02-18 |
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| CN202121682357.4U Active CN215863459U (en) | 2021-07-23 | 2021-07-23 | Organic waste gas grading temperature control catalytic oxidation treatment device |
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