CN108224452B - Device for removing volatile organic compounds through catalytic combustion - Google Patents
Device for removing volatile organic compounds through catalytic combustion Download PDFInfo
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- CN108224452B CN108224452B CN201810061891.XA CN201810061891A CN108224452B CN 108224452 B CN108224452 B CN 108224452B CN 201810061891 A CN201810061891 A CN 201810061891A CN 108224452 B CN108224452 B CN 108224452B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/20—Supplementary heating arrangements using electric energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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Abstract
The invention relates to a device for removing volatile organic compounds by catalytic combustion, belonging to the field of waste gas purification treatment. The device is a horizontal box-type structure, and a gas mixing section, a gas preheating section, a catalytic reaction I section, a catalytic reaction II section, a heat exchange section and an adsorption section are sequentially arranged from a raw gas inlet to a tail gas outlet. The device provided by the invention has the advantages of ingenious and compact design and stable operation, realizes the quick replacement of the catalyst, has the efficiency of removing the volatile organic compounds up to more than 97 percent, and reduces the investment and operation cost.
Description
Technical Field
The invention relates to a device for removing volatile organic compounds by catalytic combustion, belonging to the field of waste gas purification treatment.
Background
The definition of Volatile Organic Compounds (VOCs) by the World Health Organization (WHO) is a generic term for volatile organic compounds having a melting point below room temperature and a boiling point in the range of 50-260 ℃. Mainly volatile hydrocarbon and derivatives thereof, including hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, lipids, amines, organic acids and the like, are pollutants with large emission at present.
Currently, most of the VOCs requiring purification come from chemical processes that use large amounts of organic solvents. The purification treatment process is basically divided into two categories: the first type is recycling, and the molecular structure of VOCs is not destroyed mainly by methods such as physical absorption, adsorption and the like; such treatment methods are mainly directed to high concentrations of>5000mg/m3) Or more expensive VOCs. The second type is chemical reaction treatment, which generally introduces an oxidant into the VOCs to oxidize the VOCs into non-toxic or low-toxic chemical substances by a method of destroying the molecular structure of the VOCs; such treatment methods are mainly directed to medium or low concentrations of (<1000mg/m3) The VOCs of (1).
The chemical reaction treatment method is widely applied to combustion technology, and can be divided into direct flame combustion and catalytic combustion. The end product of combustion of VOCs is CO2，H2O, etc., although this process does not recover a portion of the VOCs that can be reused, heat can be recovered due to the combustion reaction which occurs as a strong exotherm.
Direct flame combustion is the direct combustion of combustible harmful components in exhaust gases as fuel. To ensure stable combustionThe method is only suitable for purifying the waste gas with high concentration of combustible harmful components or the waste gas with high heat value when the harmful components are combusted. The catalytic combustion is to completely oxidize harmful combustible components in the VOCs into CO under the action of a catalyst2And H2O, and the like.
The catalytic combustion of most hydrocarbons and CO can be carried out at 300-500 c, relative to the feature that direct flame combustion must be carried out at high temperatures around 1100 c. Therefore, catalytic combustion has become one of effective means for purifying exhaust gas containing hydrocarbons, and the removal rate is generally 95% or more.
However, how to further improve the efficiency of the technology for treating VOCs by catalytic combustion becomes one of the bottlenecks in the fields of wide application of catalytic combustion technology and purification treatment of exhaust gas. In order to meet the increasing technical requirements of catalytic combustion for treating VOCs, technical personnel in the field generally continuously improve the performance of a catalytic combustion catalyst, meanwhile, the design of a catalytic combustion device is more prone to efficient integrated design, how to achieve the optimal energy utilization efficiency of different heat absorption and release processes inside the catalytic combustion device through the logistics and energy flow distribution of an optimized system, and meanwhile, a reaction system is more miniaturized and integrated, so that the energy efficiency of the whole system is improved, and the method is a fundamental premise for the practicability of the catalytic combustion technology.
Disclosure of Invention
The invention aims to provide a device for removing volatile organic compounds by catalytic combustion, which can solve the following problems: firstly, the driving and stable operation of the device are simplified; secondly, the quick replacement of the catalyst is realized; thirdly, the efficiency of efficiently removing the volatile organic compounds is ensured; and fourthly, the device is multifunctional, the compactness of the device is improved, and the investment and the operation cost are reduced.
In order to achieve the purpose, the invention adopts the technical scheme that: a device for removing volatile organic compounds by catalytic combustion is characterized in that a gas mixing section, a gas preheating section, a catalytic reaction I section, a catalytic reaction II section, a heat exchange section and an adsorption section are sequentially arranged from a raw gas inlet to a tail gas outlet, a preheated air inlet is arranged above the raw gas inlet, an electric heater and a gas distributor I are arranged in the gas preheating section, and a catalyst filling frame I and a catalyst loading and unloading port I are arranged in the catalytic reaction I section; a catalyst loading frame II and a catalyst loading and unloading port II are arranged at the catalytic reaction II section; the heat exchange section is provided with a gas distributor II and a heat exchanger tube array, the outer side of the top of the heat exchange section is provided with an air outlet, and the outer side of the bottom of the heat exchange section is provided with an air inlet; the adsorption section is provided with an adsorbent loading and unloading opening and an adsorbent loading and unloading frame.
Furthermore, a regeneration gas inlet is arranged on the outer side of the top of the adsorption section.
Furthermore, a check valve set is arranged between the heat exchange section and the adsorption section.
Further, an air jacket is arranged between the raw material gas inlet and the gas mixing section, and an air distributor is arranged on the air jacket. The air jacket can play a role in preserving heat and heating feed gas containing volatile organic compounds, and the load of an electric heater in a subsequent gas preheating section is reduced.
Furthermore, the electric heater is provided with a heating fin and a power supply wiring.
Furthermore, at least one monitoring port is arranged at the bottom of the device.
The bottom of the device is also provided with a base.
The use method of the device comprises the following steps:
s1, raw material gas containing volatile organic compounds enters from a raw material gas inlet of a device for removing the volatile organic compounds through catalytic combustion; air enters the heat exchange section from the air inlet and flows out from the air outlet, and preheated air enters the reaction device again from the preheated air inlet;
s2, the preheated air firstly flows into an air jacket and then enters an air distributor, and the air and the feed gas containing the volatile organic compound are reversely intersected to be fully mixed in a gas mixing section;
s3, enabling the mixed gas to enter a gas preheating section, heating the mixed gas to a reaction temperature through an electric heater, sequentially entering a catalytic reaction I section and a catalytic reaction II section, and enabling the mixed gas after the catalytic reaction II section to enter a heat exchange section to exchange heat with air;
and S4, the mixed gas after heat exchange enters an adsorption section to carry out physical adsorption, and reaction tail gas reaching the emission standard flows out of the reaction device through a tail gas outlet.
The device for removing the volatile organic compounds through catalytic combustion integrates gas mixing, preheating, catalytic reaction and physical adsorption, and has high volatile organic compound removal efficiency. The device for removing volatile organic compounds by catalytic combustion is divided into different functional sections such as a preheating section, a catalytic reaction I section, a catalytic reaction II section, a heat exchange section, an adsorption section and the like. The method of combining catalytic reaction and physical adsorption is adopted to ensure that the content of volatile organic compounds in the discharged tail gas reaches the standard; the preheating section quickly preheats the feed gas containing the volatile organic compounds and the air in an electric heating mode, and ensures that the feed gas containing the volatile organic compounds and the air quickly generate chemical reaction of the volatile organic compounds and the air after flowing through the catalytic reaction section; the reaction heat generated by the reaction can be rapidly taken away by the built-in heat exchanger through air, so that the air participating in the reaction is preheated while the temperature of the catalytic reaction section is effectively controlled, and the system efficiency of the whole process is greatly improved.
The invention also arranges a loading and unloading port of the catalyst or the adsorbent on the side of the device for removing the volatile organic compounds by catalytic combustion, and the catalyst or the adsorbent can be pre-loaded in a corresponding fixed frame for integral loading and unloading, thereby greatly simplifying the catalyst loading and greatly reducing the loading time of the catalyst. The adsorption section of the device for removing volatile organic compounds by catalytic combustion is specially provided with a regeneration gas inlet, and the heat released by the reaction in the catalytic reaction I section and the catalytic reaction II section can be used for regenerating the adsorbent, so that the recycling of the adsorbent is realized, and the operation cost is reduced.
The device provided by the invention has the advantages of ingenious and compact design and stable operation, realizes the quick replacement of the catalyst, has the efficiency of removing the volatile organic compounds up to more than 97 percent, and reduces the investment and operation cost.
Drawings
FIG. 1 is a schematic perspective view of an apparatus for removing VOCs by catalytic combustion;
FIG. 2 is a side view of an apparatus for catalytic combustion devolatilization;
FIG. 3 is a top plan view of an apparatus for catalytic combustion devolatilization;
FIG. 4 is a schematic view of the internal flow of an apparatus for catalytic combustion devolatilization;
FIG. 5 is a schematic view of the air distributor inside the apparatus for catalytic combustion devolatilization.
The device comprises a raw material gas inlet 1a, a raw material gas inlet 1b, a tail gas outlet 1c, an air inlet 1d, an air outlet 1e, a preheated air inlet 1f, a regeneration gas inlet 2a, a gas mixing section 2b, a gas preheating section 2c, a catalytic reaction I section, a catalytic reaction II section, a catalytic reaction 2e, a heat exchange section 2f, an adsorption section 1, an air jacket 2, an air distributor 3, an electric heater, a power supply connection 5, a heating fin 6, a gas distributor I, 7, a catalyst filling frame I, 8, a catalyst loading and unloading port I, 9, a catalyst filling frame II, 10, a catalyst loading and unloading port II, 11, a gas distributor II, 12, a heat exchanger tube array 13, an adsorbent loading and unloading port 1, an adsorbent filling frame 15, a one-way valve bank, 16, a monitoring port 17 and a device base.
Detailed Description
The invention will be described in more detail below with reference to the accompanying figures 1-5 and the specific examples, without limiting the scope of the invention.
As shown in figure 1, the device for removing volatile organic compounds by catalytic combustion is a horizontal box-type structure, and raw material gas and air are mixed in a gas mixing section 2a at the inlet of the device and then sequentially enter a gas preheating section 2b, a catalytic reaction I section 2c, a catalytic reaction II section 2d, a heat exchange section 2e and an adsorption section 2f of the device.
The areas for removing the volatile organic compounds mainly comprise a catalytic reaction I section 2c, a catalytic reaction II section 2d, a heat exchange section 2e and an adsorption section 2f, wherein the catalytic reaction I section 2c realizes the primary removal of the volatile organic compounds, the catalytic reaction II section 2d further removes the volatile organic compounds, and the catalytic reaction I section 2c and the catalytic reactionThe principle of removing volatile organic compounds in the second stage 2d is to remove the volatile organic compounds by catalytic combustion technology, i.e. harmful combustible components in the volatile organic compounds are completely oxidized into CO under the action of catalyst2And H2O, etc., the adsorption section 2f mainly adopts a physical adsorption method to realize the removal of the volatile organic compounds, and the physical adsorbent is arranged in the adsorption section 2f to ensure that trace volatile organic compounds are further adsorbed on the basis of finishing the removal of most of the volatile organic compounds by the catalytic reaction I section 2c and the catalytic reaction II section 2d, thereby achieving the purpose of efficiently removing the volatile organic compounds.
Since the raw material gas is firstly subjected to catalytic combustion reaction with air in the catalytic reaction I section 2c and the catalytic reaction II section 2d, the temperature of the raw material gas is rapidly raised. Therefore, the heat exchange section 2e is arranged in the device, air in the heat exchange section 2e absorbs reaction heat generated by the catalytic combustion reaction of volatile organic compounds and air in the catalytic reaction I section 2c and the catalytic reaction II section 2d through the heat exchanger tube nest 12, and the air flowing through the heat exchange section 2e is preheated to a proper temperature while the temperature of the air flow in the reaction device is effectively controlled, so that the heat exchange loss can be effectively reduced, and the energy efficiency of the whole device for removing the volatile organic compounds through catalytic combustion is improved.
The catalyst loading and unloading mouth I8 of I section 2c of catalytic reaction is equipped with in the top outside of I section 2c of catalytic reaction, can load and unload the catalyst in I section 2c of catalytic reaction, simultaneously in I section 2c of catalytic reaction, is equipped with the catalyst filling frame I7 of I section of catalytic reaction. The catalyst can be filled in the catalyst filling frame I7 of the catalytic reaction I section 2c in advance for integral reloading, so that the catalyst filling is greatly simplified, and the filling time of the catalyst is greatly reduced. Similarly, the catalyst and the adsorbent in the catalytic reaction II section 2d and the adsorption section 2f can be replaced integrally.
The adsorbent in the adsorption section 2f reaches saturation after being used for a certain period of time, and at this time, the adsorbent needs to be replaced with fresh one or regenerated. The device can realize the regeneration of the adsorbent by utilizing the self reaction heat release. During regeneration, air no longer enters the heat exchange section 2e through the air inlet 1c and flows out from the air outlet 1 d. Instead, air directly enters the device from the preheated air inlet 1e and carries out catalytic reaction with raw material gas, and cold air is not introduced into the heat exchange section 2 e. The temperature can not reduce by a wide margin after the high temperature gas that air and feed gas reaction produced flows through heat transfer section 2e, this part high temperature gas can further flow through adsorption section 2f, after heating the adsorbent of this section to the uniform temperature, let in regeneration gas (air or nitrogen) at regeneration gas entry 1f, stop simultaneously to preheat the material of air entry 1e and feed gas entry 1a department, after letting in regeneration gas, under the effect of pressure, check valve group 15 self-closing, regeneration gas can only pass through high temperature adsorbent bed and flow out by tail gas export 1b, thereby realize the regeneration of adsorbent. If one time is not enough to fully regenerate the catalyst, the adsorbent can be fully regenerated by performing a plurality of cycles according to the flow scheme.
The specific method for removing the volatile organic compounds by the device for removing the volatile organic compounds through catalytic combustion provided by the invention comprises the following steps:
(1) the raw material gas containing the volatile organic compounds enters the device from a right raw material gas inlet 1a of the device for removing the volatile organic compounds through catalytic combustion; air enters the heat exchanger tube nest 12 of the built-in heat exchanger in the heat exchange section 2e from the air inlet 1c and then flows out from the air outlet 1d, and the preheated air enters the device again from the external pipeline through the preheated air inlet 1 e.
(2) When the volatile organic compound removing process is stable, the air in the heat exchange section 2e can absorb the reaction heat generated by the catalytic combustion reaction of the volatile organic compound and the air in the catalytic reaction I section 2c and the catalytic reaction II section 2d, and the air flowing through the heat exchange section 2e is preheated to 80-120 ℃ while the temperature of the air flow in the reaction device is effectively controlled. The heat exchange process is carried out in the heat exchange section 2e in the device, so that the heat exchange loss can be effectively reduced, and the energy efficiency of the whole device for removing the volatile organic compounds by catalytic combustion is improved.
(3) Preheated air enters the device from the preheated air inlet 1e through an external pipeline and then flows into the air jacket 1 at first, the air jacket 1 can play a role in preserving heat and heating feed gas containing volatile organic compounds, and the load of the electric heater 3 in the subsequent gas preheating section 2b is reduced.
(4) Air enters the air distributor 2 from the air jacket 1, and the air and the feed gas containing the volatile organic compounds are reversely intersected, so that the two air flows can be fully mixed in the gas mixing section 2a, and the subsequent catalytic combustion reaction is facilitated.
(5) Mixing air with raw material gas containing volatile organic compounds, feeding the mixture into a gas preheating section 2b, heating the mixture gas to a proper temperature in the preheating section by an electric heater 3, feeding the mixture gas into a catalytic reaction I section 2c, performing catalytic reaction on harmful combustible components in the volatile organic compounds and the air on the surface of a catalyst in the catalytic reaction I section 2c, and oxidizing part of the volatile organic compounds into CO2And H2O, and the like.
(6) The mixed gas for realizing the partial removal of the volatile organic compounds enters a catalytic reaction II section 2d from a catalytic reaction I section 2c, and on the surface of the catalyst in the catalytic reaction II section 2d, harmful combustible components in the volatile organic compounds continue to perform catalytic reaction with air, so that most of the volatile organic compounds are removed.
(7) The temperature of the mixed gas for removing most of volatile organic compounds is further increased due to the occurrence of catalytic reaction. The gas with relatively high temperature enters the heat exchange section 2e through the catalytic reaction section II 2d, and the air and the high-temperature mixed gas exchange heat.
(8) The mixed gas after heat exchange enters the adsorption section 2f through the check valve group 15, a physical adsorbent is arranged in the adsorption section 2f, and trace volatile organic compounds are further adsorbed on the basis that most of 2d volatile organic compounds are removed in the catalytic reaction I section 2c and the catalytic reaction II section, so that the purpose of efficiently removing the volatile organic compounds is achieved.
(9) After two times of catalytic reactions and one time of adsorption and removal, the reaction tail gas reaching the emission standard flows out of the tail gas outlet 1b to be catalytically combusted to remove the volatile organic compounds.
The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (5)
1. A device for removing volatile organic compounds by catalytic combustion is characterized in that a gas mixing section (2a), a gas preheating section (2b), a catalytic reaction I section (2c), a catalytic reaction II section (2d), a heat exchange section (2e) and an adsorption section (2f) are sequentially arranged from a raw gas inlet (1a) to a tail gas outlet (1b), a preheated air inlet (1e) is arranged above the raw gas inlet (1a), an electric heater (3) and a gas distributor I (6) are arranged in the gas preheating section (2b), and a catalyst filling frame I (7) and a catalyst loading and unloading port I (8) are arranged in the catalytic reaction I section (2 c); a catalyst loading frame II (9) and a catalyst loading and unloading opening II (10) are arranged at the catalytic reaction II section (2 d); a gas distributor II (11) and a heat exchanger tube nest (12) are arranged on the heat exchange section (2e), an air outlet (1d) is arranged on the outer side of the top of the heat exchange section (2e), and an air inlet (1c) is arranged on the outer side of the bottom of the heat exchange section (2 e); the adsorption section (2f) is provided with an adsorbent loading and unloading opening (13) and an adsorbent loading and unloading frame (14); a regeneration gas inlet (1f) is arranged at the outer side of the top of the adsorption section (2f), and a check valve group (15) is arranged between the heat exchange section (2e) and the adsorption section (2 f).
2. The apparatus according to claim 1, characterized in that an air jacket (1) is provided between the feed gas inlet (1a) and the gas mixing section (2a), and an air distributor (2) is provided on the air jacket (1).
3. The device according to claim 1, characterized in that the electric heater (3) is provided with heating fins (5) and power supply wiring (4).
4. Device according to claim 1, characterized in that at least one monitoring port (16) is provided at the bottom of the device.
5. Device according to claim 1, characterized in that a base (17) is also provided at the bottom of the device.
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| CN201810061891.XA CN108224452B (en) | 2018-01-23 | 2018-01-23 | Device for removing volatile organic compounds through catalytic combustion |
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| CN201810061891.XA CN108224452B (en) | 2018-01-23 | 2018-01-23 | Device for removing volatile organic compounds through catalytic combustion |
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| CN108224452B true CN108224452B (en) | 2020-01-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100951052B1 (en) * | 2010-02-22 | 2010-04-01 | 신장철 | Apparatus for deodorizing and improving contaminated air |
| CN204768199U (en) * | 2015-06-24 | 2015-11-18 | 上海蓝科石化环保科技股份有限公司 | Small -size VOCs exhaust gas purification device suitable for cubic catalyst |
| CN204880159U (en) * | 2015-08-03 | 2015-12-16 | 广东俐峰环保科技有限公司 | Catalystic combustion device |
| CN106345294A (en) * | 2016-10-28 | 2017-01-25 | 平越 | Catalytic oxidation device for organic waste gas |
| CN206094118U (en) * | 2016-09-19 | 2017-04-12 | 南通海阳节能环保科技有限公司 | An organic waste gas purifier |
-
2018
- 2018-01-23 CN CN201810061891.XA patent/CN108224452B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100951052B1 (en) * | 2010-02-22 | 2010-04-01 | 신장철 | Apparatus for deodorizing and improving contaminated air |
| CN204768199U (en) * | 2015-06-24 | 2015-11-18 | 上海蓝科石化环保科技股份有限公司 | Small -size VOCs exhaust gas purification device suitable for cubic catalyst |
| CN204880159U (en) * | 2015-08-03 | 2015-12-16 | 广东俐峰环保科技有限公司 | Catalystic combustion device |
| CN206094118U (en) * | 2016-09-19 | 2017-04-12 | 南通海阳节能环保科技有限公司 | An organic waste gas purifier |
| CN106345294A (en) * | 2016-10-28 | 2017-01-25 | 平越 | Catalytic oxidation device for organic waste gas |
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