Deodorizing device for malodorous waste gas

Abstract

The utility model belongs to the technical field of disinfection and deodorization, and particularly relates to a deodorization device for malodorous waste gas. Comprising an ozone generator, a gas catalytic reactor and a controller. One end of the gas catalytic reactor is communicated with the malodorous waste gas through a gas inlet pipeline, the other end of the gas catalytic reactor is communicated with the atmosphere through an exhaust pipeline, a waterproof breathable layer and a catalytic reaction layer are further arranged in the gas catalytic reactor, and the gas catalytic reactor further comprises an ozone inlet pipe communicated with the ozone generator; and an air outlet of the air heater faces the interior of the gas catalytic reactor. According to the device disclosed by the utility model, the catalytic oxidation reaction of mixed gas of ozone and malodorous waste gas is accelerated on the surface of the catalyst by adopting the synergistic catalytic oxidation effect of ozone and the catalyst, and the purposes of disinfection and deodorization can be achieved by one-time passing, so that the reaction efficiency of ozone and malodorous waste gas and the disinfection and deodorization effect on the malodorous waste gas are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of disinfection and deodorization technology, specifically relating to a deodorization device for malodorous waste gas. Background Technology

[0002] Odorous exhaust gases mainly originate from industrial production processes such as chemical, pharmaceutical, printing and dyeing, and leather processing, as well as from urban waste disposal and sewage treatment plants. The composition of odorous exhaust gases is complex, primarily consisting of gases such as hydrogen sulfide, ammonia, methanethiol, and hydrocarbon compounds. Direct emission of these gases not only pollutes the atmospheric environment but also has serious effects on human health, such as irritating the eyes, nose, and throat, and causing symptoms like headaches and nausea.

[0003] Malodorous gases can be broadly classified into five categories: ① sulfur-containing compounds, such as hydrogen sulfide, thiols, and thioethers; ② chlorine-containing compounds, such as amines, amides, and indoles; ③ halogens and their derivatives, such as chlorine and halogenated hydrocarbons; ④ hydrocarbons, such as alkanes, alkenes, alkynes, and aromatic hydrocarbons; and ⑤ oxygen-containing organic compounds, such as alcohols, phenols, aldehydes, ketones, and organic acids.

[0004] Malodor is a complex smell that affects the human sense of smell. While the concentration of malodorous gases is usually low, even low concentrations can have a severe psychological impact. For example, the main components of malodorous gases produced during wastewater treatment include hydrogen sulfide, ammonia, and activated sludge droplets, as well as small amounts of organic gases such as methanethiol and methylamine. These components are highly volatile and easily diffuse into the atmosphere; some are toxic, such as hydrogen sulfide. Hydrogen sulfide is an inorganic compound with the chemical formula H₂∑. Under standard conditions, it is a colorless, flammable, acidic gas that is highly toxic and diffuses easily. At low concentrations, it smells like rotten eggs; at higher concentrations, it is odorless (high concentrations of hydrogen sulfide can numb the olfactory nerves), and at extremely low concentrations, it has a sulfurous smell. Hydrogen sulfide is acutely toxic; inhaling even a small amount of high-concentration hydrogen sulfide can be fatal within a short time. Low concentrations of hydrogen sulfide can affect the eyes, respiratory system, and central nervous system. Other malodorous components can also have varying degrees of impact on the human body. Moreover, their odor threshold concentration is very low; the minimum detection limit of the analytical instrument for malodorous substances is 10. -6 ~10 -9 Volume ratio, while the human olfactory threshold for most foul-smelling exhaust gases is only 10. -9 The volume ratio shows that even a small amount of malodorous gas emitted can have a strong effect, causing serious odor pollution.

[0005] Currently, the main treatment methods for odorous waste gases include physical methods, physicochemical methods, and biological methods. Physical methods mainly include dilution and masking methods; physicochemical methods mainly include adsorption, chemical absorption, catalytic photolysis, and ozone oxidation; biological methods utilize the metabolic activity of microorganisms to convert harmful substances in waste gases into harmless substances.

[0006] There is no comprehensive, economical, and reasonable solution for treating malodorous waste gases, either domestically or internationally. In practice, a single treatment method often fails to achieve the desired treatment effect. Utility Model Content

[0007] In order to better solve the pollution problems caused by malodorous waste gas, this utility model proposes to provide an ozone deodorization device for malodorous waste gas.

[0008] Ozone is a strong oxidant and a broad-spectrum disinfectant. When ozone decomposes, it releases free radical oxygen [O]: O3→O 2+ [0], free ground oxygen [O], also known as highly reactive atomic oxygen, has a strong oxidizing ability. This invention utilizes the strong oxidizing ability of ozone and the highly reactive atomic oxygen produced by its decomposition, combined with the catalytic effect of a highly efficient catalyst, to achieve the purpose of disinfection and deodorization of malodorous waste gas.

[0009] The technical measures of this utility model are:

[0010] An odor deodorization device for malodorous waste gas includes an ozone generator, a gas catalytic reactor, and a controller. The gas catalytic reactor has one end connected to the malodorous waste gas via an inlet pipe and the other end connected to the atmosphere via an exhaust pipe. The gas catalytic reactor also includes a waterproof and breathable layer and a catalytic reaction layer. Furthermore, the gas catalytic reactor includes an ozone inlet pipe connected to the ozone generator and a hot air blower with its outlet facing the interior of the gas catalytic reactor.

[0011] The ozone generator described herein can employ either corona discharge ozone generation technology or proton exchange membrane (PEM) electrolytic ozone generation technology. As a preferred option, PEM electrolytic ozone generation technology produces ozone with higher concentration and purer composition, resulting in better disinfection and deodorization of malodorous waste gases.

[0012] The ozone inlet pipe is connected to the ozone generator via a pipe.

[0013] The catalytic reaction layer consists of multiple layers of catalysts, which are semi-waterproof. Preferably, the catalysts are arranged in an alternating pattern, increasing the contact area and residence time between the gas and the catalyst, while reducing resistance to gas flow.

[0014] The waterproof and breathable layer has a dense mesh structure, which can effectively intercept water vapor in malodorous exhaust gas, prevent water vapor from damaging the waterproof properties of the catalyst, and extend the service life of the catalyst.

[0015] The hot air blower can be turned on periodically in a controlled manner to dry the catalyst in the catalytic reaction layer with hot air, so as to keep the catalyst in a semi-waterproof state, thereby maintaining the performance of the catalyst and extending its service life.

[0016] This novel device utilizes the synergistic catalytic oxidation effect of ozone and a catalyst, accelerating the catalytic oxidation reaction of the ozone and odorous waste gas mixture on the catalyst surface. Disinfection and deodorization are achieved in a single pass, significantly improving the reaction efficiency between ozone and odorous waste gas, as well as the disinfection and deodorization effect. Simultaneously, the waterproof and breathable layer and the hot air blower work together to self-maintain the catalyst, greatly extending its lifespan. Compared with existing technologies, this ozone catalytic oxidation technology device offers advantages such as simple operation, rapid reaction efficiency, excellent treatment effect, small footprint, low investment cost, stable operation, and no secondary pollution. It has broad application prospects in disinfection, deodorization, air purification, and exhaust gas treatment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a device for disinfecting and deodorizing malodorous waste gas using ozone.

[0018] In the diagram, 1-gas catalytic reactor, 2-exhaust pipe, 3-catalytic reaction layer, 4-hot air blower, 5-inlet pipe, 6-waterproof and breathable layer, 7-ozone inlet pipe, 8-ozone generator, 9-controller. Detailed Implementation

[0019] The ozone water disinfection device for purified water systems in the pharmaceutical industry according to this invention will be further described below with reference to the accompanying drawings.

[0020] An odor deodorization device for malodorous waste gas includes an ozone generator 8, a gas catalytic reactor 1, and a controller 9.

[0021] The ozone generator 8 described herein can employ either corona discharge ozone generation technology or proton exchange membrane (PEM) electrolytic ozone generation technology. As a preferred option, the PEM electrolytic ozone generation technology produces ozone with higher concentration and purer composition, resulting in better disinfection and deodorization of malodorous waste gases.

[0022] The gas catalytic reactor 1 is connected to the malodorous waste gas at one end through the air inlet pipe 5 and to the atmosphere at the other end through the exhaust pipe 2. The gas catalytic reactor 1 also has a waterproof and breathable layer 6 and a catalytic reaction layer 3 inside. The gas catalytic reactor 1 also includes an ozone inlet pipe 7 connected to the ozone generator 8, and a hot air blower 4 with the air outlet facing the inside of the gas catalytic reactor 1.

[0023] The malodorous waste gas passes through the intake pipe 5, first through the waterproof and breathable layer 6, and then through the catalytic reaction layer 3. The waterproof and breathable layer 6 has a dense mesh structure, which can effectively intercept water vapor in the waste gas, prevent water vapor from damaging the waterproof properties of the catalyst, and extend the service life of the catalyst.

[0024] The catalytic reaction layer 3 is composed of multiple catalyst layers, with its surface coated with various precious metal catalysts and a waterproof coating. The catalyst is semi-waterproof, allowing the mixture of odorous waste gas and ozone to fully contact and undergo catalytic oxidation on its surface. Simultaneously, it prevents water vapor carried by the gas from adsorbing onto the catalyst surface and affecting its catalytic performance. Preferably, the catalysts are arranged in a staggered manner, forming a baffled airflow channel, which increases the contact area and residence time between the gas and the catalyst, while reducing the resistance to gas flow.

[0025] The hot air blower 4 is electrically connected to the controller 9 and can be turned on periodically in a controlled manner to dry the catalyst in the catalytic reaction layer 3 with hot air, so as to keep the catalyst in a semi-waterproof state, maintain the catalytic activity of the catalyst, and extend the service life of the catalyst.

[0026] The controller 9 is also electrically connected to the ozone generator (8) and is responsible for controlling the periodic activation of the ozone generator 8. The controller can be simply implemented using a microcontroller or PLC.

[0027] A fan can also be installed inside the air intake pipe 5 to increase the power for the entry of malodorous exhaust gas.

[0028] In operation, the malodorous waste gas enters the gas catalytic reactor 1 through the inlet pipe 5, where some water vapor is intercepted by the waterproof and breathable layer 6. Ozone generated by the ozone generator 8 enters the gas catalytic reactor 1 through the ozone inlet pipe 7. The malodorous waste gas and ozone are mixed in the gas catalytic reactor 1 and flow together through the catalytic reaction layer 3, where a catalytic oxidation reaction occurs on the catalyst surface to achieve the purpose of disinfection and deodorization of the malodorous waste gas. The waste gas treated by ozone catalytic oxidation is discharged through the exhaust pipe 2. The entire process does not require circulation and can achieve the purpose of disinfection and deodorization in a single pass.

[0029] This invention utilizes the synergistic catalytic oxidation effect of ozone and a catalyst, accelerating the catalytic oxidation reaction of the ozone and odorous waste gas mixture on the catalyst surface. This significantly improves the reaction efficiency between ozone and odorous waste gas, as well as the disinfection and deodorization effect (both sterilization and deodorization rates >90%). Compared with existing technologies, this ozone catalytic oxidation technology offers advantages such as simple operation, rapid reaction efficiency, excellent treatment effect, small footprint, low investment cost, stable operation, and no secondary pollution. It has broad application prospects in disinfection, deodorization, air purification, and exhaust gas treatment.

Claims

1. A deodorization device for malodorous waste gas, characterized in that, It includes an ozone generator (8), a gas catalytic reactor (1), and a controller (9); the gas catalytic reactor (1) is connected to the malodorous waste gas at one end through an air inlet pipe (5) and to the atmosphere at the other end through an exhaust pipe (2). The gas catalytic reactor (1) also has a waterproof and breathable layer (6) and a catalytic reaction layer (3) inside. The gas catalytic reactor (1) also includes an ozone inlet pipe (7) connected to the ozone generator (8) and a hot air blower (4) with the air outlet facing the inside of the gas catalytic reactor (1).

2. The deodorization device according to claim 1, characterized in that, The ozone generator (8) is a proton exchange membrane electrolysis ozone generator.

3. The deodorization device according to claim 1, characterized in that, After the malodorous exhaust gas passes through the air inlet pipe (5), it first passes through the waterproof and breathable layer (6) and then through the catalytic reaction layer (3). The waterproof and breathable layer (6) has a dense mesh structure.

4. The deodorization device according to claim 1, characterized in that, The catalytic reaction layer (3) is composed of multiple catalysts, which are arranged in an alternating manner to form a baffled air duct.

5. The deodorizing device according to claim 1, characterized in that, The hot air blower (4) is electrically connected to the controller (9), and the controller (9) is also electrically connected to the ozone generator (8).

6. The deodorization device according to claim 5, characterized in that, The controller (9) mentioned above is a microcontroller or a PLC.

7. The deodorizing device according to claim 1, characterized in that, A fan is installed inside the air intake pipe (5).

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