CN210934447U - A device for combined treatment of malodorous gas - Google Patents

Abstract

The utility model relates to a gaseous technical field that purifies especially relates to a combined treatment foul gas's device, including scrubbing tower, oxidation tower, washing circulation tank, spray circulation tank and ozone water generator, foul gas passes through the pipeline, fan and spark arrester and is connected with the inlet end of scrubbing tower, the end of giving vent to anger of scrubbing tower passes through the pipeline and is connected with the inlet end of oxidation tower, the inside fixedly connected with spraying system of oxidation tower, spraying system is connected with washing circulation tank through pipeline and pump respectively, the bottom of scrubbing tower goes out the water end and passes through the pipeline and is connected with washing circulation tank. The utility model discloses an utilize UV photodissociation technique, ozone oxidation's processing technology and photooxidation technique combination technology to handle foul gas, make it can be quick effectual produce a large amount of hydroxyl free radicals, make its treatment effect to foul gas improve by a wide margin.

Description

A device for combined treatment of malodorous gas

technical field

The utility model relates to the technical field of gas purification, in particular to a device for combined treatment of malodorous gas.

Background technique

As air quality has an important impact on many fields of social production and social life, the quality and protection of the atmospheric environment has attracted more and more attention and attention, and odorous gas pollution has become one of the major problems of atmospheric environmental pollution. Production, municipal sewage, sludge treatment and garbage disposal facilities are the main sources of malodorous gases, as well as the corresponding production sources of chemical pharmaceuticals, rubber and plastics, paints and coatings, printing and dyeing leather, food, livestock breeding and fermentation pharmaceuticals.

There are many kinds of odorous substances and a wide range of sources, which can cause different degrees of toxicity to the human respiratory, digestive, cardiovascular, endocrine and nervous systems. Among them, aromatic compounds such as benzene, toluene and styrene can also cause deformities and cancers in the human body. Therefore, The treatment of malodorous gas has attracted great attention. At present, most of the treatment methods for malodorous gas on the market are single treatment. However, due to the low content of oxygen and water in the malodorous gas, the amount of hydroxyl groups produced is not enough to meet the purification requirements of the malodorous gas, and the treatment effect is not good.

Utility model content

(1) Technical problems solved

Aiming at the deficiencies of the prior art, the utility model provides a device for combined treatment of malodorous gas, which has the advantages of being convenient for treating malodorous gas, and solves the problem of using a single method for treatment, resulting in less generation of hydroxyl radicals and ineffective treatment of malodorous gas. Good, the problem of not meeting the emission standards.

(2) Technical solutions

In order to realize the above-mentioned technical problems, the present utility model provides such a device for combined treatment of malodorous gas, including a washing tower, an oxidation tower, a washing circulating water tank, a spraying circulating water tank and an ozone water generator. The flame arrester is connected to the air inlet end of the washing tower, the air outlet end of the washing tower is connected to the air inlet end of the oxidation tower through a pipeline, and the inside of the oxidation tower is fixedly connected with a spray system, and the spray system passes through the The pipeline and the pump are connected with the washing circulating water tank, and the bottom outlet end of the washing tower is connected with the washing circulating water tank through the pipeline.

The spray circulating water tank is connected to the ozone water inlet end of the ozone water generator through pipes and pumps, the outlet end of the ozone water generator is connected to the spray system in the middle of the oxidation tower through pipes, and the drainage at the bottom of the oxidation tower is connected. The end is connected with the spray circulating water tank through the pipeline.

Further, the oxidation tower is operated at normal pressure, the operating temperature of the oxidation tower is 20-25 ° C, the spray system is fixedly connected with a micro-mist nozzle, and the top of the washing tower is fixedly connected with a spray device.

Further, bulk fillers are fixedly connected to the middle of the oxidation tower, and the surfaces of the bulk fillers are coated with metal oxides, and the metal oxides are one of Al ₂ O ₃ , TiO ₂ or MnO ₂ .

Further, a UV lamp is fixedly connected to the bottom of the inside of the oxidation tower, and a demister is fixedly connected to the top of the inside of the oxidation tower, and the demister is a stainless steel wire mesh structure.

(3) Beneficial effects

The utility model provides a device for combined treatment of malodorous gas, which has the following beneficial effects:

1. The combined device and treatment method for treating malodorous gas utilizes UV photolysis technology, ozone oxidation treatment technology and photooxidation technology combined process to treat malodorous gas, so that it can quickly and effectively generate a large number of hydroxyl radicals, making it effective against malodorous gas. The gas treatment effect is greatly improved.

2. The combined device and treatment method for treating malodorous gas uses ultraviolet lamps to irradiate ozone to generate hydroxyl radicals, and conducts rapid and effective deep oxidation treatment of malodorous factor pollutants in malodorous gas, so that VOC pollutants are quickly and completely degraded into Substances that are not harmful to the environment.

3. The combined device and method for treating malodorous gas, because a large amount of ozone is added for the reaction, can effectively generate a large amount of hydroxyl radicals, and can oxidize the organic pollutants in the gas. Compared with other single ozone oxidation reactions on the market Or the method of directly oxidizing the oxygen and water in the malodorous gas by the ultraviolet lamp to generate a small amount of hydroxyl radicals.

Description of drawings

Fig. 1 is the schematic flow sheet of the utility model;

Fig. 2 is a schematic diagram of the structure of the oxidation tower of the present invention.

In the figure: 1. Washing tower; 2. Oxidation tower; 3. Washing circulating water tank; 4. Spraying circulating water tank; 5. Ozone water generator; 6. Bulk packing; 7. Spraying system; 8. Ultraviolet lamp; 9 , demister.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to Figure 1-2, a device for combined treatment of malodorous gas, including a washing tower 1, an oxidation tower 2, a washing circulating water tank 3, a spraying circulating water tank 4 and an ozone water generator 5, the malodorous gas passes through pipes, fans and resistors. The firearm is connected with the inlet end of the washing tower 1, the outlet end of the washing tower 1 is connected with the inlet end of the oxidation tower 2 through the pipeline, and the inside of the oxidation tower 2 is fixedly connected with a spray system 7, and the spray system 7 passes through the pipeline and The pump is connected to the washing circulating water tank 3, and the bottom outlet end of the washing tower 1 is connected to the washing circulating water tank 3 through a pipeline.

The spray circulating water tank 4 is connected with the ozone water inlet end of the ozone water generator 5 through pipes and pumps, and the outlet end of the ozone water generator 5 is connected with the spray system 7 in the middle of the oxidation tower 2 through pipes, and the drainage at the bottom of the oxidation tower 2 is connected. The end is connected to the spray circulating water tank 4 through a pipeline.

The oxidation tower 2 is operated at atmospheric pressure, the operating temperature of the oxidation tower 2 is 20-25 ° C, the spray system 7 is fixedly connected with a micro-mist nozzle, the middle of the oxidation tower 2 is fixedly connected with a bulk filler 6, and the surface of the bulk filler 6 is coated There are metal oxides, the metal oxide is one of Al ₂ O ₃ , TiO ₂ or MnO ₂ , a spray device is fixedly connected to the top inside the washing tower 1, and an ultraviolet lamp 8 is fixedly connected to the bottom of the inside of the oxidation tower 2, A demister 9 is fixedly connected to the top inside the oxidation tower 2, and the demister 9 is a stainless steel wire mesh structure.

In addition, the present utility model also discloses a treatment method of the above device for treating malodorous gas in combination, comprising the following steps;

Step 1. The malodorous gas enters the inlet end of the washing tower through the collection system, pipes and fans. The spray device inside the washing tower can spray and wash the entering malodorous gas, which has the effects of dust removal, oil removal and cooling. The main function of shower washing is to remove the dust particles in the malodorous gas, and to cool the malodorous gas to control the temperature of the malodorous gas at 20-25 degrees Celsius, which is convenient for entering the subsequent system. This step can be skipped when required by subsequent systems.

Step 2. The water after pretreatment spraying and washing flows into the washing circulating water tank through the bottom drain end of the washing tower for natural sedimentation treatment, and the supernatant after the natural sedimentation is transported to the spray device in the washing tower 1 again through pipelines and pumps , spray, wash and cool the odorous gas. A temperature measuring device is installed at the outlet of the washing tower to detect the temperature of the odorous gas exiting the washing tower. When the temperature at the outlet of the washing tower is too high, the spray washing can be adjusted by the control system. The amount of water sprayed by the pump is controlled to meet the temperature control requirements. This step is a circulation system.

Step 3. The odorous gas that has been washed enters the inlet end of the oxidation tower through the pipeline, and the air flow direction inside the oxidation tower is from bottom to top. The ozone water is sprayed out from the chemical nozzle, which is in full contact with the entering malodorous gas. At the same time, the ozone gas in the ozone water reacts under the irradiation of the ultraviolet lamp to generate hydroxyl radicals, and the hydroxyl radicals react with the malodorous factors in the malodorous gas. It is oxidized to carbon dioxide and water, at which point most of the malodorous factors have been removed.

Step 4. In the oxidation tower, the spray system at the bottom of the bulk packing sprays ozone water downward, and the surface of the bulk packing is coated with metal oxides. These oxides can remove the water molecules in the odorous gas after being irradiated by light. And part of the uncatalyzed ozone gas is catalyzed into hydroxyl radicals for a second time, and a more sufficient secondary contact is carried out in the bulk filler, and the secondary oxidation of the malodor factor is carried out for a longer time to ensure the complete removal of the malodor factor. After the gas with odor factor passes through the upper secondary bulk packing again, the water droplets contained in the gas are removed by the demister at the top of the oxidation tower to reach the emission standard, and the purified harmless gas is evacuated through the chimney.

Step 5. The sprayed droplets flow to the bottom of the oxidation tower and flow to the spray circulating water tank by gravity. The water in the spray circulating water tank enters the ozone water generator again through pipes and pumps, and the ozone water generator passes through. The low-pressure DC electrolyzed water produces ozone water, which is then input to the spray system in the oxidation tower for spraying. When the detection device at the outlet detects that the gas discharge does not meet the standard, the spray water and ozone can be increased through the control system. This step for a circulatory system.

The utility model utilizes UV photolysis technology, ozone oxidation treatment technology and photooxidation technology combined process to treat malodorous gas, so that it can quickly and effectively generate a large number of hydroxyl radicals, so that the treatment effect on malodorous gas is greatly improved.

UV photolysis technology and ozone oxidation treatment technology is an advanced oxidation technology that combines ozone with ultraviolet radiation. Under the irradiation of ultraviolet light (wavelength 185nm), ozone decomposes to generate active hydroxyl radicals (-OH), The reaction mechanism is as follows:

O ₃ +H ₂ O+hv——O ₂ +H ₂ O ₂

H ₂ O ₂ +hv——2-OH

In the utility model, the amount of hydroxyl radicals generated is increased by adding ozone, and the ozone water is decomposed into a uniform micro-mist of 20-40um through the action of the micro-atomizing nozzle. The nozzle surface is irradiated by an ultraviolet lamp with a wavelength of 185nm. Since the ozone water micro-mist particles are very small and evenly distributed on the cross section of the oxidation tower, the ultraviolet light can fully irradiate all the micro-mist particles, so that they can fully react , produce hydroxyl radicals, and carry out advanced oxidation treatment (AOP).

The filler used in the utility model is a bulk filler, and the surface of the bulk filler is coated with metal oxides (Al2O3, TiO2, MnO2, etc.), and these oxides can remove the water molecules and parts of the rising odorous gas under light irradiation. The catalyzed ozone gas undergoes secondary catalysis into hydroxyl radicals, and the malodorous gas undergoes more sufficient secondary contact in the bulk filler 6, and the malodorous factor is subjected to secondary oxidation for a longer time to ensure the complete removal of the malodorous factor.

Taking TiO2 as an example, TiO2 can undergo redox reactions under light conditions. Since its electronic structure is a full valence band and an empty conduction band, when the photon energy (hv) reaches or exceeds its band gap energy, the electrons will It can be excited from the valence band to the conduction band, and at the same time generate corresponding holes in the valence band, that is, generate electron (e-), hole (h+) pairs, usually, the conduction band electrons and valence band holes in the activated state will It is recombined into a neutral body (N), producing energy, which is dissipated in the form of light energy (hv) or heat energy.

When a suitable capture agent or surface defect state exists, the recombination of electrons and holes is inhibited, and a redox reaction occurs on the surface, in which the valence band holes are good oxidants, and the conduction band electrons are good reducing agents. In photocatalytic semiconductors, holes have greater reactivity and carry the main part of the photon energy, which generally reacts with H2O or OH- adsorbed on the surface to form surface hydroxyl groups with strong oxidizing properties. The reaction formula is as follows:

OH+h ⁺ — OH

H ₂ O+h ⁺ — OH+H ⁺

For electrons, they generally react with oxygen molecules adsorbed on the surface, and the generated reactive oxygen molecules not only participate in the reduction reaction, but also another source of surface hydroxyl groups. The specific reaction formula is:

O ₂ +e ^- —·O ₂ ^-

·O ₂ ^- +H ₂ O— ·OOH+OH ^-

2·OOH—H ₂ O ₂ +O ₂

·OOH+H ₂ O+e ^- -H ₂ O ₂ +OH ^-

H ₂ O ₂ +e ^- — OH+OH ^-

The hydroxyl group has a reaction energy of 402.8MJ/mol, so it can completely decompose various organic substances, and finally generate non-toxic products such as CO ₂ and H ₂ O.

The device can collect data online through an online monitor according to the concentration of the odorous gas, and process it through PLC to adjust the system's spray water volume, the irradiation intensity of the ultraviolet lamp, the residence time of the gas and other indicators. Malodorous gases of different concentrations.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. The utility model provides a device of combined treatment foul gas, includes scrubbing tower (1), oxidation tower (2), washing circulation tank (3), sprays circulation tank (4) and ozone water generator (5), its characterized in that: the malodorous gas is connected with the gas inlet end of a washing tower (1) through a pipeline, a fan and a flame arrester, the gas outlet end of the washing tower (1) is connected with the gas inlet end of an oxidation tower (2) through a pipeline, a spraying system (7) is fixedly connected inside the oxidation tower (2), the spraying system (7) is respectively connected with a washing circulating water tank (3) through a pipeline and a pump, and the water outlet end at the bottom of the washing tower (1) is connected with the washing circulating water tank (3) through a pipeline;

the spraying circulating water tank (4) is connected with an ozone water inlet end of the ozone water generator (5) through a pipeline and a pump, an outlet end of the ozone water generator (5) is connected with a spraying system (7) in the middle of the oxidation tower (2) through a pipeline, and a water discharging end at the bottom of the oxidation tower (2) is connected with the spraying circulating water tank (4) through a pipeline.

2. A combined malodorous gas treatment device as claimed in claim 1, wherein: the oxidation tower (2) is operated at normal pressure, the operating temperature of the oxidation tower (2) is 20-25 ℃, the spray system (7) is fixedly connected with a micro-mist nozzle, and the top inside the washing tower (1) is fixedly connected with a spray device.

3. A combined malodorous gas treatment device as claimed in claim 1, wherein: the middle part of the oxidation tower (2) is fixedly connected with a bulk packing (6), and the surface of the bulk packing (6) is coated with metal oxide.

4. A combined malodorous gas treatment device as claimed in claim 1, wherein: the bottom fixedly connected with ultraviolet lamp (8) of oxidation tower (2) inside, the inside top fixedly connected with demister (9) of oxidation tower (2), and demister (9) are the stainless steel wire net structure.

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