Zeolite rotating wheel for treating styrene-containing organic waste gas

Abstract

The invention belongs to the technical field of environmental protection equipment, and particularly discloses a zeolite rotating wheel for treating styrene-containing organic waste gas. The zeolite rotating wheel comprises an anti-polymerization wheel core, a VOCs wheel core and a connecting shaft; the anti-inhibition wheel core is provided with a porous channel structure penetrating front and back, and an anti-inhibition molecular sieve is loaded on the inner wall of the channel; the VOCs wheel core is attached to the rear portion of the anti-polymerization wheel core and is provided with a porous channel structure penetrating front and back, a zeolite molecular sieve is loaded on the inner wall of the channel, and the connecting shaft penetrates through the anti-polymerization wheel core and the VOCs wheel core to connect the anti-polymerization wheel core and the VOCs wheel core in series and fixedly connect the anti-polymerization wheel core and the VOCs wheel core. According to the present invention, the efficient adsorption and concentration of the easily-polymerized styrene component and the conventional non-methane total hydrocarbon can be achieved, the requirements of the chemical industry, the plastic industry, the printing industry, the coating industry and other industries on the styrene-containing and non-methane total hydrocarbon-containing waste gas working condition treatment are met, the purification effect of the styrene-containing organic waste gas is substantially improved, and the service life of the equipment is substantially prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection equipment, and in particular to a zeolite rotor for treating organic waste gas containing styrene. Background Art

[0002] With the rapid development of industries such as chemicals, plastics, printing, and coatings, styrene is widely used as an important chemical raw material. However, during the production process, styrene and other volatile organic compounds are released in a gaseous state, forming waste gas with a pungent odor, which poses a serious threat to the environment and human health. Styrene-containing waste gas has the characteristics of low concentration and large air volume. Directly using traditional combustion methods to treat it is not only economically costly, but also difficult to achieve the ideal treatment effect. At the same time, the easy polymerization characteristics of styrene in waste gas make traditional adsorption materials (such as activated carbon or ordinary molecular sieves) easy to polymerize during the adsorption process, resulting in a decrease in adsorption efficiency and a shortened life of equipment and materials.

[0003] Zeolite wheel technology has gradually become the preferred solution for treating organic waste gas due to its excellent adsorption capacity, high concentration ratio, low operating cost and wide applicability. Zeolite wheel can effectively adsorb most VOCs (volatile organic compounds) on the wheel surface through physical adsorption, and desorb them at a suitable temperature, thereby purifying and treating the waste gas.

[0004] However, most of the current zeolite wheels have difficulty in adsorbing styrene, and styrene is very easy to undergo self-polymerization reactions. The polymers produced can cause problems such as clogging of the wheel core and pipelines, seriously affecting the waste gas treatment efficiency and the service life of the zeolite wheel. Some environmental protection companies have developed anti-polymerization wheels for styrene, but this type of wheel has the technical difficulty of being only sensitive to easily polymerized components such as styrene and insensitive to conventional non-methane hydrocarbon components. This results in poor treatment effects under conditions where industrial waste gas contains both styrene and non-methane hydrocarbons. It is impossible to achieve simultaneous adsorption of styrene and non-methane hydrocarbons through a single wheel device, and the equipment needs to be superimposed, increasing investment and operating costs.

[0005] Therefore, it is particularly important to develop an efficient, stable and economical technology for treating organic waste gas containing styrene and non-methane total hydrocarbons. Summary of the invention

[0006] To solve the above problems, the present invention provides a zeolite rotor for treating styrene-containing organic waste gas, which has a simple structure and can simultaneously adsorb styrene and conventional non-methane total hydrocarbons in the waste gas, thereby reducing the impact of styrene polymerization on waste gas treatment.

[0007] In order to achieve the above object, the specific technical solution adopted by the present invention is as follows:

[0008] A zeolite rotor for treating styrene-containing organic waste gas, comprising:

[0009] The anti-inhibition polymerization wheel core has a porous channel structure that runs through the front and back, and the inner wall of the channel is loaded with an anti-inhibition polymerization molecular sieve for adsorbing styrene components in the exhaust gas;

[0010] The VOCs wheel core is fitted behind the anti-impedance polymerization wheel core and has a porous channel structure that runs through the front and back. The inner wall of the channel is loaded with zeolite molecular sieves for adsorbing non-methane total hydrocarbon components in the exhaust gas;

[0011] The connecting shaft is passed through the anti-polymerization wheel core and the VOCs wheel core to connect the two in series and to be fixedly connected with the two.

[0012] In the above-mentioned zeolite wheel, the porous channel structure is defined as a wheel core main structure having a large number of channels parallel to the axis of the wheel core, which is used to load the molecular sieve for adsorption and for gas to flow back and forth. When the organic waste gas flows through the channels, it comes into contact with the molecular sieve, and the organic matter is adsorbed by it, thereby achieving the purpose of gas purification.

[0013] Preferably, the anti-polymerization wheel core and the VOCs wheel core both include a wheel core skeleton, and the wheel core skeleton includes an inner ring plate, an outer ring plate, and a plurality of partitions connected between the inner surfaces of the inner ring plate and the outer ring plate; the inner ring plate is mounted on the connecting shaft; the partition divides a plurality of fan-shaped areas between the inner ring plate and the outer ring plate, and the porous channel structure includes a plurality of channel modules filled in the fan-shaped areas. Styrene cannot achieve 100% anti-polymerization due to its self-polymerization characteristics. The adsorption material (i.e., the porous channel structure) in the anti-polymerization wheel core needs to be replaced in time to ensure that it maintains a high adsorption efficiency for a long time. Such a structural setting of the wheel core allows the channel module to be disassembled and replaced from the side, reducing the difficulty of replacing the anti-polymerization wheel core, protecting the rear-end VOCs wheel core while extending the service life of the overall equipment, and the VOCs wheel core can also be replaced in the same way.

[0014] Furthermore, the channel module is formed by alternately arranging and interconnecting a first substrate unit and a second substrate unit made of glass fiber, wherein the first substrate unit is planar and the second substrate unit is corrugated.

[0015] Preferably, the anti-polymerization wheel core and the VOCs wheel core are driven to rotate by a power device (such as a motor), and the power device is connected to the outer peripheral surface of the outer ring plate through a transmission chain, so that the axis of the wheel core will not deviate when it rotates.

[0016] Preferably, the zeolite wheel for treating styrene-containing organic waste gas further comprises a space region where an anti-inhibition polymerization wheel core and a VOCs wheel core are located, and the space region is sequentially divided into an adsorption region, a desorption region and a cooling region along the running direction of the wheel core;

[0017] The adsorption zone is the exhaust gas inlet side on the side of the anti-inhibition wheel core, and the corresponding VOCs wheel core side is the exhaust gas outlet side; the desorption zone is the high-temperature gas inlet side on the side of the VOCs wheel core, and the corresponding anti-inhibition wheel core side is the high-temperature gas outlet side; the cooling zone is the cooling gas inlet side on the side of the anti-inhibition wheel core, and the corresponding VOCs wheel core side is the cooling gas outlet side.

[0018] Preferably, the anti-inhibition molecular sieve is one or more of ZEM-5, HZSM-5, USY, SAPO, MOR, and Beta. These anti-inhibition molecular sieves are molecular sieves with a high silicon-aluminum ratio and a pH near neutral, which can avoid the accelerated catalysis of styrene polymerization by the acidic molecular sieve environment and the aluminum-containing molecular sieve environment to the greatest extent, and reduce the occurrence of polymerization reaction.

[0019] Preferably, the zeolite molecular sieve is one or more of NaY, USY, FAU, and ZSM.

[0020] The present invention has the following beneficial effects:

[0021] 1. By combining the anti-polymerization wheel core with the VOCs wheel core, the adsorption of styrene and non-methane total hydrocarbons in the exhaust gas is achieved, avoiding the blockage problem caused by the large-scale polymerization of styrene in the VOCs wheel core and prolonging its service life.

[0022] 2. The porous channel structure is formed by alternating the corrugated and planar substrate units, so that it has a higher specific surface area, high load rate, and low resistance, which effectively improves the adsorption efficiency; in addition, it is not easy to deform, which increases the service life of the wheel core.

[0023] 3. Through the modular setting of the porous channel structure, the difficulty of replacing the anti-resistance polymerization wheel is reduced, the regular replacement needs are met (the replacement cycle depends on the operating conditions), and the rear-end VOCs wheel core is protected.

[0024] 4. The present invention has a simple structure and low installation and operation costs.

[0025] In summary, the present invention can achieve efficient adsorption and concentration of easily polymerized styrene components and conventional non-methane total hydrocarbons, meet the needs of chemical, plastic, printing, coatings and other industries for the treatment of waste gas containing both styrene and non-methane total hydrocarbons, and greatly improve the purification effect of styrene-containing organic waste gas and the service life of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : Operation flow chart of the zeolite rotor used for treating styrene-containing organic waste gas in Example 1.

[0027] Figure 2 : Schematic diagram of the structure of the wheel core (anti-polymerization wheel core and VOCs wheel core) in the zeolite wheel described in Example 1.

[0028] Figure 3 : A partially enlarged schematic diagram of the porous channel structure in the zeolite wheel described in Example 1.

[0029] In the figure: 1-anti-inhibition wheel core, 2-VOCs wheel core, 3-connecting shaft, 4-adsorption zone, 5-desorption zone, 6-cooling zone, 7-desorption heat source; 11-first substrate unit, 12-second substrate unit, 13-wheel core skeleton; 131-inner ring plate, 132-partition plate, 133-outer ring plate. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] A zeolite rotor for treating styrene-containing organic waste gas, such as Figure 1-3 As shown, it includes an anti-resistance polymerization wheel core 1, a VOCs wheel core 2 and a connecting shaft 3; the anti-resistance polymerization wheel core 1 has a porous channel structure that runs through the front and back, and the inner wall of the channel is loaded with an anti-resistance polymerization molecular sieve; the VOCs wheel core 2 is fitted behind the anti-resistance polymerization wheel core 1, has a porous channel structure that runs through the front and back, and the inner wall of the channel is loaded with a zeolite molecular sieve; the connecting shaft 3 is passed through the axis of the anti-resistance polymerization wheel core 1 and the VOCs wheel core 2, connects the two in series and fixes them to the two.

[0033] More specifically, the structures of the anti-polymerization wheel core 1 and the VOCs wheel core 2 are the same, such as Figure 2 As shown, they all include a porous channel structure (gray mesh part) and a wheel core skeleton 13 that supports the porous channel structure. The wheel core skeleton 13 includes an inner ring plate 131, an outer ring plate 133, and a plurality of partitions 132 connected between the inner surfaces of the inner ring plate 131 and the outer ring plate 133; the inner ring plate 131 is mounted on the connecting shaft 3; the partitions 132 divide a plurality of fan-shaped areas between the inner ring plate 131 and the outer ring plate 133, and the porous channel structure includes a plurality of channel modules filled in the fan-shaped areas, and the channel modules can be taken out from the side to realize partial replacement of the wheel core. The channel module is formed by alternatingly arranging the first substrate unit 11 and the second substrate unit 12 made of glass fiber and bonding them to each other ( Figure 3 ), the first substrate unit 11 is planar, and the second substrate unit 12 is corrugated; the molecular sieve is coated on the first substrate unit and the surface of the second substrate unit to form an adsorption coating. In this embodiment, the anti-inhibition molecular sieve is ZEM-5, and the zeolite molecular sieve is NaY.

[0034] The anti-resistance polymerization wheel core 1 and the VOCs wheel core 2 are driven to rotate by a power device, which is a motor, and its output end is connected to a transmission wheel. The transmission wheel and the outer ring plates 133 of the two wheel cores are connected by a winding transmission chain, thereby realizing the motor driving the wheel core.

[0035] The anti-resistance and polymerization wheel core 1 and the VOCs wheel core 2 are spatially and sequentially fixedly divided into an adsorption zone 4, a desorption zone 5 and a cooling zone 6 along the running direction of the wheel core; the adsorption zone 4 is the exhaust gas inlet side on the side of the anti-resistance and polymerization wheel core 1, and the corresponding VOCs wheel core 2 side is the exhaust gas outlet side; the desorption zone 5 is the high-temperature gas inlet side on the side of the VOCs wheel core 2, and the corresponding anti-resistance and polymerization wheel core 1 side is the high-temperature gas outlet side; the cooling zone 6 is the cooling gas inlet side on the side of the anti-resistance and polymerization wheel core 1, and the corresponding VOCs wheel core 2 side is the cooling gas outlet side. The various parts of the rotating wheel core pass through the adsorption zone 4, the desorption zone 5 and the cooling zone 6 in sequence to complete the organic matter adsorption-organic matter desorption-internal cooling cycle process.

[0036] The operation process of the zeolite rotor for treating styrene-containing organic waste gas ( Figure 1 ) is as follows: the organic waste gas is introduced into the wheel core adsorption zone 4, and the two wheel cores of the adsorption zone 4 sequentially adsorb styrene and non-methane total hydrocarbon components, and then discharge the purified gas; the desorption zone 5 introduces the heated waste gas to sequentially desorb the organic matter intercepted by the two-stage wheel cores, and the desorbed waste gas is sent to the deep treatment equipment for incineration and cracking into CO2 and H2O; the cooling zone 6 cools the two wheel cores whose temperatures rise after desorption by introducing cooling gases such as normal temperature waste gas and normal temperature air, so as to continue adsorption; after the cooling gas is discharged, it is heated to 210-230°C (higher than the polymerization temperature of styrene) by the desorption heat source 7 to obtain heated waste gas, which is recycled to the desorption zone 5. Through this process, the efficient, convenient and stable treatment of organic waste gas containing styrene is completed.

[0037] This specific implementation is only an explanation of the present invention, not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A zeolite rotor for treating styrene-containing organic waste gas, characterized in that: include: The anti-inhibition polymerization wheel core (1) has a porous channel structure that runs through the front and back, and the inner wall of the channel is loaded with an anti-inhibition polymerization molecular sieve; The VOCs wheel core (2) is arranged behind the anti-inhibition polymerization wheel core (1) and has a porous channel structure that runs through the front and back, and the inner wall of the channel is loaded with zeolite molecular sieve; The connecting shaft (3) is passed through the anti-polymerization wheel core (1) and the VOCs wheel core (2), connecting the two in series and being fixedly connected to the two.

2. The zeolite rotor for treating styrene-containing organic waste gas according to claim 1, characterized in that: The anti-polymerization wheel core (1) and the VOCs wheel core (2) both include a wheel core frame (13), wherein the wheel core frame (13) includes an inner ring plate (131), an outer ring plate (133), and a plurality of partition plates (132) connected between the inner surfaces of the inner ring plate (131) and the outer ring plate (133); the inner ring plate (131) is mounted on the connecting shaft (3); the partition plates (132) divide a plurality of fan-shaped areas between the inner ring plate (131) and the outer ring plate (133), and the porous channel structure includes a plurality of channel modules filled in the fan-shaped areas.

3. The zeolite rotor for treating styrene-containing organic waste gas according to claim 2, characterized in that: The channel module is formed by alternately arranging and interconnecting a first substrate unit (11) and a second substrate unit (12) made of glass fiber, wherein the first substrate unit (11) is planar and the second substrate unit (12) is corrugated.

4. The zeolite rotor for treating styrene-containing organic waste gas according to claim 2, characterized in that: The anti-polymerization wheel core (1) and the VOCs wheel core (2) are driven to rotate by a power device, and the power device is connected to the outer peripheral surface of the outer ring plate (133) through a transmission chain.

5. The zeolite rotor for treating styrene-containing organic waste gas according to claim 1, characterized in that: It also includes a space area where the anti-polymerization wheel core (1) and the VOCs wheel core (2) are located, and the space area is divided into an adsorption area (4), a desorption area (5) and a cooling area (6) in sequence along the running direction of the wheel core; The adsorption zone (4) is the exhaust gas inlet side on the side of the anti-inhibition wheel core (1), and the corresponding VOCs wheel core (2) side is the exhaust gas outlet side; the desorption zone (5) is the high-temperature gas inlet side on the side of the VOCs wheel core (2), and the corresponding anti-inhibition wheel core (1) side is the high-temperature gas outlet side; the cooling zone (6) is the cooling gas inlet side on the side of the anti-inhibition wheel core (1), and the corresponding VOCs wheel core (2) side is the cooling gas outlet side.

6. The zeolite rotor for treating styrene-containing organic waste gas according to claim 1, characterized in that: The anti-inhibition molecular sieve is one or more of ZEM-5, HZSM-5, USY, SAPO, MOR, and Beta.

7. The zeolite rotor for treating styrene-containing organic waste gas according to claim 1, characterized in that: The zeolite molecular sieve is one or more of NaY, USY, FAU and ZSM.

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