A gas-liquid reactor for treating malodorous gases

Abstract

The present application discloses a gas-liquid reaction tower for treating malodorous gases, comprising a reaction tower body, wherein a liquid accumulation chamber is provided at the bottom of the reaction tower body, and an aerator for aerating external waste gas into the liquid in the liquid accumulation chamber; a gas-liquid mixing device for emulsifying waste gas overflowed due to the liquid in the liquid accumulation chamber reaching a saturated dissolved absorption state, a spraying device for spraying the waste gas, a defoaming and decomposing device for removing foam in the waste gas and decomposing ozone, and a negative pressure fan for discharging the waste gas from the reaction tower body are sequentially arranged above the aerator; the technical solution of the present application improves the treatment efficiency and treatment effect of malodorous gases and reduces the treatment cost.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a gas-liquid reactor for treating malodorous gases. Background Art

[0002] The petroleum industry is an industry with heavy odor pollution, which has received great attention worldwide. The main odor components produced by oil refining are hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, ethyl sulfide, carbon disulfide, dimethyl disulfide, ammonia, methylamine, dimethylamine, trimethylamine, benzene, toluene, xylene, styrene, phenol, cresol, total sulfur, total hydrocarbons, C1-C8 hydrocarbons and other substances. These odor pollutants are classified as sulfides, hydrocarbons, ammonia, organic amines, etc.

[0003] The main source of malodorous gases in residents' daily lives is leachate, which is a secondary pollutant produced by extraction, hydrolysis and fermentation during the stacking and disposal of garbage due to the leaching and scouring of rainwater and the immersion of surface water and groundwater. It mainly comes from the inherent water of the garbage itself and the water produced by the biochemical reaction of the garbage, including leachate from comprehensive garbage treatment plants, food waste treatment plants, domestic waste treatment plants and landfills. During the treatment process, leachate produces high concentrations of malodorous gases, the main components of which are ammonia and hydrogen sulfide, as well as organic substances such as mercaptans, sulfides, ethanol, volatile organic acids, alkanes, esters, etc. produced during the leachate treatment process.

[0004] Malodorous gas has many pollutants, which not only have a serious impact on the ecological environment, but also have great harm to human health, causing serious damage to human vision and sense of smell. Some of them have great potential threats to human hair, skin and endocrine system, and may even cause poisoning and death. The development process of malodorous gas treatment technology has evolved from the initial water washing method to the currently commonly used activated carbon adsorption method, biological deodorization method, plant liquid deodorization method and high-energy ion deodorization treatment process.

[0005] Traditional malodorous gas treatment processes such as the biofilter method have the disadvantages of large footprint, sensitivity to environmental climate change, poor shock load resistance and complex operation; the plant liquid deodorization method has the disadvantages of high operating costs and being greatly affected by climate factors; the high-energy ion deodorization method has high operation and maintenance costs and safety risks. Summary of the invention

[0006] The present application proposes a gas-liquid reaction tower for treating malodorous gases, which improves the treatment efficiency and treatment effect of malodorous gases and reduces the treatment cost.

[0007] The embodiment of the present application provides a gas-liquid reaction tower for treating malodorous gases, comprising a reaction tower body, wherein a liquid accumulation chamber and an aerator for aerating external waste gas into the liquid in the liquid accumulation chamber are provided at the bottom of the reaction tower body; a gas-liquid mixing device for emulsifying waste gas overflowed due to the liquid in the liquid accumulation chamber reaching a saturated dissolved absorption state, a spraying device for spraying waste gas, a defoaming decomposition device for removing foam in the waste gas and decomposing ozone, and a negative pressure fan for discharging waste gas out of the reaction tower body are sequentially provided above the aerator;

[0008] The liquid outlet of the liquid accumulation chamber is connected to an external ozone catalytic oxidation device, and the ozone catalytic oxidation device is used to perform ozone oxidation treatment on the liquid discharged from the liquid accumulation chamber. The ozone catalytic oxidation device is provided with a liquid discharge port for discharging the treated liquid and an exhaust port for discharging ozone, and an emulsification layer connected to the liquid discharge port and the exhaust port is provided between the spray device and the gas-liquid mixing device.

[0009] In some embodiments, the liquid in the fluid accumulation cavity is set to water.

[0010] In some embodiments, the aerator is configured as a cyclone aerator, and the cyclone aerator includes a cyclone air guide pipe for conveying the waste gas, and the cyclone air guide pipe is provided with a plurality of cyclone aeration heads for aerating the waste gas into the liquid in the liquid accumulation chamber.

[0011] In some embodiments, the gas-liquid mixing device includes a plurality of cyclone tubes arranged in parallel, and a spiral flow channel is provided inside the cyclone tube for the exhaust gas to flow through.

[0012] In some embodiments, a guide column is coaxially disposed inside the swirl tube, and a plurality of swirl blades are sequentially mounted on the guide column along its length direction, and a spiral flow channel for the exhaust gas to flow through is formed between the plurality of swirl blades.

[0013] In some embodiments, the spray device includes a spray pipe connected to an external spray liquid, and a plurality of spray heads for spraying the spray liquid are installed on the spray pipe, and the spray liquid is set to be hydrogen peroxide.

[0014] In some embodiments, the defoaming and decomposition device includes a folding plate defoaming layer for defoaming and a catalytic decomposition layer for catalytically decomposing ozone.

[0015] In some embodiments, a plurality of defoaming folding plates arranged in parallel are installed in the defoaming folding plate layer, a gap between two adjacent defoaming folding plates constitutes a flow channel for the exhaust gas to flow through, and the flow channel is arranged in a curved shape.

[0016] In some embodiments, the catalytic decomposition layer is filled with a plurality of wire meshes, and the wire meshes are configured as a wire mesh structure made of manganese oxide material.

[0017] In some embodiments, a uniform gas layer for uniformly rising the exhaust gas is provided between the aerator and the gas-liquid mixing device.

[0018] Compared with the prior art, the beneficial effects of the present application are: the structure of the existing malodorous gas treatment device is improved, and the reaction tower performs four-stage treatment on the waste gas, namely: the waste gas is directly exposed to the liquid in the liquid accumulation chamber and transported to an external ozone catalytic oxidation device for oxidation; the waste gas is secondary mixed with the liquid input by the ozone catalytic oxidation device in the gas-liquid mixing device, flows into the liquid accumulation chamber and is transported to the external ozone catalytic oxidation device for a second oxidation, thereby achieving the purpose of circulation treatment; the third oxidation is performed by the spray liquid sprayed by the spray device; the fourth oxidation is performed by the catalytic decomposition layer of the defoaming decomposition device; thereby greatly improving the treatment efficiency and treatment effect of the waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the gas-liquid reaction tower structure of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the aerator for this application;

[0022] Figure 3 This is a top view of the gas-liquid mixing device structure of this application;

[0023] Figure 4 This is a top view of the cyclone structure of this application;

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] A gas-liquid reaction tower for treating malodorous gas proposed in this embodiment comprises a reaction tower body 1, wherein a liquid accumulation chamber 2 and an aerator 3 for aerating external waste gas into the liquid in the liquid accumulation chamber 2 are provided at the bottom of the reaction tower body 1; a gas-liquid mixing device 4 for emulsifying waste gas overflowed due to the liquid in the liquid accumulation chamber 2 reaching a saturated dissolved absorption state, a spraying device 5 for spraying waste gas, a defoaming decomposition device 6 for removing foam in waste gas and decomposing ozone, and a negative pressure fan 7 for discharging waste gas out of the reaction tower body 1 are sequentially provided above the aerator 3;

[0028] The liquid outlet of the liquid accumulation chamber 2 is connected to an external ozone catalytic oxidation device 8, and the ozone catalytic oxidation device 8 is used to perform ozone oxidation treatment on the liquid discharged from the liquid accumulation chamber 2. The ozone catalytic oxidation device 8 is provided with a liquid discharge port for discharging the treated liquid and an exhaust port for discharging ozone. An emulsification layer 9 connected to the liquid discharge port and the exhaust port is provided between the spray device 5 and the gas-liquid mixing device 4.

[0029] It should be noted that this embodiment improves the structure of the existing gas-liquid reaction tower for treating malodorous gases. In the reaction tower body 1, the malodorous gases are treated in four stages, which greatly improves the treatment efficiency and treatment effect, and reduces the treatment cost.

[0030] First, the external exhaust gas is exposed to the liquid in the liquid storage chamber 2 through the aerator 3, so that the liquid exposed to the exhaust gas is transported to the external ozone catalytic oxidizer, and is oxidized by ozone to form ozone water dissolved with ozone and a portion of undissolved ozone gas. This is the first treatment of the exhaust gas.

[0031] Then, the ozone water and the ozone gas enter the emulsion layer 9 in the reaction tower body 1 together, and during the aeration process at the bottom of the reaction tower body 1, the waste gas overflowed due to the saturated dissolution and absorption state of the liquid in the liquid accumulation chamber 2 will continue to rise to the gas-liquid mixing device 4, so that in the gas-liquid mixing device 4, the rising waste gas and the ozone water falling in the emulsion layer 9 will fully contact and emulsify to form an emulsion, which will flow into the liquid accumulation chamber 2 again under the action of gravity, and will be discharged into the external ozone catalytic oxidizer for cyclic oxidation treatment. This is the second treatment of the waste gas;

[0032] The waste gas discharged from the gas-liquid mixing device 4 will rise again and pass through the spray device 5. The spray device 5 is connected to an external spray liquid. In this embodiment, the spray liquid is set as an oxidant, so that the waste gas can be oxidized again. This is the third treatment of the waste gas; it should be noted that the second treatment is a cyclic treatment method. After the first and second oxidation treatments, the toxic and harmful substances in the waste gas are basically oxidized. Therefore, the spray device 5 in this embodiment can be used as a backup device. When the amount of gas exposed at the bottom is too large, the first and second oxidation treatments will be incomplete. At this time, the spray device 5 can be turned on to spray and oxidize the waste gas, thereby ensuring a more thorough treatment, and also achieving the purpose of energy saving and avoiding waste of resources. This is the third treatment of the waste gas;

[0033] The exhaust gas after three oxidation treatments continues to rise to the defoaming and decomposition device 6. First, the folding plate defoaming layer 61 will remove the foam and impurities in the exhaust gas. After the removal, only non-toxic and harmless gases and a part of ozone are basically left in the exhaust gas. At this time, when passing through the catalytic decomposition layer 62, the ozone can be further decomposed to ensure that the exhaust gas is non-toxic and harmless gas, and finally discharged from the negative pressure fan 7. This is the fourth treatment of the exhaust gas.

[0034] In summary, through four times of exhaust gas treatment, toxic and harmful substances in the exhaust gas can be completely removed, so that the exhaust gas meets the emission standards. The structural design is simple, the exhaust gas treatment efficiency and effect are high, the cost is low, and it is conducive to promotion.

[0035] Furthermore, in this embodiment, the liquid in the liquid accumulation chamber 2 is set to be water.

[0036] Further, refer to Figure 2 The aerator 3 is configured as a cyclone aerator 3, and the cyclone aerator 3 includes a cyclone air guide pipe 31 for conveying the waste gas, and the cyclone air guide pipe 31 is equipped with a plurality of cyclone aeration heads 32 for aerating the waste gas into the liquid in the liquid accumulation chamber 2, so as to improve the aeration effect.

[0037] Further, refer to Figure 3 and Figure 4 The gas-liquid mixing device 4 includes a plurality of cyclone tubes 41 arranged in parallel, and a spiral flow channel for the exhaust gas to flow through is provided inside the cyclone tubes 41. When the exhaust gas passes through the gas-liquid mixing device 4, since the flow channel of the exhaust gas is a spiral flow channel, the time and path of the exhaust gas flow can be increased, so that the exhaust gas can be more fully contacted and merged with the liquid falling from above to form an emulsion, making the emulsification more thorough.

[0038] Furthermore, a guide column 42 is coaxially provided inside the swirl tube 41, and a plurality of swirl blades 43 are sequentially installed on the guide column 42 along its length direction. A spiral flow channel for the exhaust gas to flow through is formed between the plurality of swirl blades 43. After the exhaust gas enters the swirl tube 41, it can spirally rise along the guidance of the swirl blades 43, thereby fully contacting with the liquid.

[0039] Furthermore, the spray device 5 includes a spray pipe connected to an external spray liquid, and a plurality of spray heads for spraying the spray liquid are installed on the spray pipe. The spray liquid is set to be hydrogen peroxide. The selection of hydrogen peroxide here can effectively oxidize the waste gas, making the waste gas treatment more thorough.

[0040] Furthermore, the defoaming and decomposing device 6 comprises a folded plate defoaming layer 61 for defoaming and a catalytic decomposition layer 62 for catalytically decomposing ozone.

[0041] Furthermore, a plurality of parallel arranged defoaming folding plates are installed in the folding plate defoaming layer 61, and the gap between two adjacent defoaming folding plates constitutes a flow channel for the exhaust gas to flow through, and the flow channel is arranged in a curved shape. In this embodiment, the flow channel of the exhaust gas is formed by the gap between a plurality of flat arranged defoaming folding plates, and the flow channel is designed in a curved shape, which can increase the residence time of the exhaust gas in the folding plate defoaming layer 61, and can also increase the contact area between the exhaust gas and the defoaming folding plates, thereby improving the foam removal effect.

[0042] Furthermore, the catalytic decomposition layer 62 is filled with a plurality of wire meshes, and the wire meshes are set to a wire mesh structure made of manganese oxide. In this embodiment, the wire mesh structure can firstly filter the exhaust gas, and secondly, since the exhaust gas contains ozone, the wire mesh structure is set to be made of manganese oxide material, which can oxidize and decompose the ozone in the exhaust gas, thereby improving the treatment effect of the exhaust gas and making the discharged exhaust gas non-toxic and harmless.

[0043] Furthermore, an air-evening layer 10 for uniformly rising the exhaust gas is provided between the aerator 3 and the gas-liquid mixing device 4. Since the aerator 3 generates a certain force in the process of aerating the exhaust gas, adding an air-evening layer 10 between the aerator 3 and the gas-liquid mixing device 4 can buffer the rising of the exhaust gas, thereby allowing the exhaust gas to enter the gas-liquid mixing device 4 evenly and smoothly so as to fully contact and mix with the liquid falling from above.

[0044] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A gas-liquid reaction tower for treating malodorous gases, characterized in that: The invention comprises a reaction tower body, wherein a liquid accumulation chamber and an aerator for aerating external waste gas into the liquid in the liquid accumulation chamber are provided at the bottom of the reaction tower body; a gas-liquid mixing device for emulsifying waste gas overflowed due to the liquid in the liquid accumulation chamber reaching a saturated dissolved absorption state, a spraying device for spraying waste gas, a defoaming and decomposing device for removing foam in the waste gas and decomposing ozone, and a negative pressure fan for discharging waste gas out of the reaction tower body are sequentially provided above the aerator; The liquid outlet of the liquid accumulation chamber is connected to an external ozone catalytic oxidation device, and the ozone catalytic oxidation device is used to perform ozone oxidation treatment on the liquid discharged from the liquid accumulation chamber. The ozone catalytic oxidation device is provided with a liquid discharge port for discharging the treated liquid and an exhaust port for discharging ozone, and an emulsified layer connected to the liquid discharge port and the exhaust port is provided between the spray device and the gas-liquid mixing device; The aerator is configured as a cyclone aerator, and the cyclone aerator comprises a cyclone air guide pipe for conveying the waste gas, and the cyclone air guide pipe is provided with a plurality of cyclone aeration heads for aerating the waste gas into the liquid in the liquid accumulation chamber; The gas-liquid mixing device comprises a plurality of swirl tubes arranged in parallel, wherein a spiral flow channel is provided inside the swirl tube for the exhaust gas to flow through; A guide column is coaxially arranged inside the swirl tube, and a plurality of swirl blades are sequentially installed on the guide column along its length direction, and a spiral flow channel for the exhaust gas to flow through is formed between the plurality of swirl blades.

2. The gas-liquid reaction tower for treating malodorous gas according to claim 1, characterized in that: The liquid in the liquid accumulation cavity is set to be water.

3. The gas-liquid reaction tower for treating malodorous gas according to claim 1, characterized in that: The spray device comprises a spray pipe connected with an external spray liquid, and a plurality of spray heads for spraying the spray liquid are installed on the spray pipe, and the spray liquid is set to be hydrogen peroxide.

4. The gas-liquid reaction tower for malodorous gas treatment according to claim 1, characterized in that: The defoaming and decomposing device comprises a folding plate defoaming layer for defoaming and a catalytic decomposition layer for catalytically decomposing ozone.

5. The gas-liquid reaction tower for treating malodorous gas according to claim 4, characterized in that: A plurality of defoaming folding plates arranged in parallel are installed in the defoaming folding plate layer, and the gap between two adjacent defoaming folding plates constitutes a flow channel for the exhaust gas to flow through, and the flow channel is arranged in a curved shape.

6. The gas-liquid reaction tower for treating malodorous gas according to claim 4, characterized in that: The catalytic decomposition layer is filled with a plurality of wire meshes, and the wire meshes are arranged as a wire mesh structure made of manganese oxide material.

7. The gas-liquid reaction tower for treating malodorous gas according to claim 1, characterized in that: An air-homogenizing layer for evenly rising the waste gas is also provided between the aerator and the gas-liquid mixing device.

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