CN108671719A - A kind of VOCs collection and treatment devices - Google Patents

Abstract

The invention discloses a VOCs collection and treatment device, which includes a VOCs trap. The VOCs trap includes a main frame, a sub-frame, an outer adsorption layer formed by a plurality of activated carbon plates, and a plurality of activated carbon plates. The inner adsorption layer formed in one week, the inner adsorption layer is surrounded by the outer adsorption layer, the outer adsorption layer is fixed on the main frame, the inner adsorption layer is fixed on the sub-frame, the sub-frame is fixedly connected with the main frame, the inner adsorption layer and the outer adsorption layer A closed photocatalytic chamber is formed between the layers, and a number of ultraviolet lamps are evenly distributed in the photocatalytic chamber. The middle part of the inner adsorption layer forms a circulation chamber. The upper end of the main frame is provided with an exhaust port connected to the circulation chamber, and a fan is fixed in the exhaust port. , the blower creates negative pressure in the flow chamber, the outside of the outer adsorption layer is covered with a filter, and the filter is fixed on the main frame. The VOCs collection and treatment device of the present invention has the advantages of high efficiency, easy installation, multifunctional integration, and low cost.

Description

A VOCs collection and treatment device

technical field

The invention belongs to the technical field of gas purification, and in particular relates to a VOCs collection and treatment device.

Background technique

Volatile organic compounds (Volatile Organic Compounds, referred to as VOCs) are listed as the second largest category of air pollutants, after dust. According to the definition of the US Federal Environmental Protection Agency, volatile organic compounds refer to all carbon compounds related to atmospheric photochemical reactions except CO, CO2, H2CO3, metal carbides, metal carbonates and ammonium carbonate. Some species in VOCs will seriously deteriorate the surrounding air environment, seriously disturb the daily life of residents around the factory area, and cause harm to human health and ecological environment. Therefore, the removal of VOCs has attracted the attention of the whole society. At present, the traditional VOCs treatment mode is to set up an on-site purification system for the VOCs emission sources of each enterprise to treat the emissions on-site. This method is very effective for pollution sources with large pollution discharge loads, continuous emissions, and relatively concentrated pollution. However, there are still many enterprises whose production characteristics are: intermittent production process and scattered discharge points; the characteristics of exhaust gas are: large air volume and not too high concentration. In this case, the investment and operation costs of the traditional local treatment mode are high. It is of great practical significance to find a treatment method with high efficiency and low investment to solve the problem of collection and purification of such waste gas.

Contents of the invention

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a VOCs collection and processing device, including a VOCs catcher, and the VOCs catcher includes a main frame, a subframe, and a circle formed by several activated carbon plates. The outer adsorption layer, the inner adsorption layer formed by a circle of activated carbon plates, the inner adsorption layer is surrounded by the outer adsorption layer, the outer adsorption layer is fixed on the main frame, the inner adsorption layer is fixed on the sub-frame, the sub-frame and the main frame The frame is fixedly connected, and a closed photocatalytic chamber is formed between the inner adsorption layer and the outer adsorption layer. Several ultraviolet lamps are evenly distributed in the photocatalytic chamber, and the middle part of the inner adsorption layer forms a circulation cavity. An exhaust port, a fan is fixed in the exhaust port, the fan creates negative pressure in the flow chamber, the outside of the outer adsorption layer is covered with a filter screen, and the filter screen is fixed on the main frame.

The activated carbon plate includes a grid-like hanger and honeycomb activated carbon located in each grid, and the honeycomb activated carbon matches the grid.

The VOCs collection and processing device also includes a desorption box and a catalytic combustion box. The desorption box is provided with an air inlet and an air outlet. The desorption box is provided with a grid for placing honeycomb activated carbon. The interior is divided into an air inlet chamber and an air outlet chamber, the air inlet is connected to the air inlet chamber, and the air outlet is connected to the air outlet chamber. The catalytic combustion box is provided with an inlet and an outlet, and the catalytic combustion box is sequentially provided with a primary catalytic chamber, a combustion chamber, The secondary catalytic chamber, the primary catalytic chamber and the secondary catalytic chamber are respectively equipped with honeycomb precious metal catalysts, the combustion chamber is equipped with a burner, the primary catalytic chamber is connected to the inlet, the secondary catalytic chamber is connected to the outlet, and the outlet is connected to a gas distributor , one side of the gas distributor is connected to a chimney, the other way is connected to the air inlet of the desorption box through the detachable first air pipe, the gas outlet of the desorption box is connected to the inlet of the catalytic combustion box through the detachable second air pipe, and the second A desorption fan is installed on the trachea, and a make-up fan is connected to the inlet.

The active components of the honeycomb noble metal catalyst are noble metals platinum and palladium.

A heat recovery box is provided between the desorption fan and the inlet of the catalytic combustion box, and heat recovery chambers are respectively connected to the inlet of the desorption fan and the catalytic combustion box in the heat recovery box, and heat sinks are installed between the gas distributor and the chimney , the heat sink is located in the heat recovery cavity.

The desorption fan, catalytic combustion box, heat recovery box, make-up fan, and chimney are all installed on a movable mobile vehicle.

The working principle of the present invention is:

Arrange multiple VOCs traps in places such as factories, workshops or warehouses that have a large area and cannot be collected by pipelines. Due to the negative pressure in the flow chamber, the exhaust gas is pushed by the pressure to filter out particles or fibers through the filter screen, and then through the outer adsorption layer, part of the VOCs is adsorbed and trapped by the honeycomb activated carbon, and the remaining exhaust gas is photocatalytically treated in the photocatalytic chamber. , the VOCs in the photocatalytically treated gas are secondarily adsorbed and trapped by the honeycomb activated carbon in the inner adsorption layer, and the treated clean gas enters the circulation chamber and is discharged by the fan.

When the VOCs trap works for a period of time, the honeycomb activated carbon in the inner and outer adsorption layers is saturated, and the honeycomb activated carbon is taken out and placed on the grid in the desorption box. Connect the first air pipe to the air inlet of the desorption box, and the second air pipe to the heat recovery box. Turn on the desorption fan to form a circulating airflow between the desorption box and the catalytic combustion box. The burner in the combustion chamber is turned on to heat the airflow, and the hot airflow blows and desorbs VOCs from the honeycomb activated carbon. The hot airflow with VOCs is preheated by the heat recovery box and then enters the catalytic combustion box. After primary catalysis, high-temperature combustion, and secondary catalysis in the catalytic combustion box, VOCs generate harmless substances such as CO ₂ and water vapor. The gas after combustion and catalytic treatment is distributed by the gas distributor, partly discharged from the chimney, and partly enters the air inlet of the desorption box through the first gas pipe to form a hot air flow that blows out and desorbs the honeycomb activated carbon. The make-up fan supplies fresh air to the catalytic combustion box. The gas discharged from the chimney needs to exchange heat with the airflow with VOCs through the heat sink in the heat recovery box, preheat the airflow with VOCs, and then pass through the chimney discharge.

The beneficial effects of the present invention are: (1) high efficiency, the purification efficiency of the VOCs trap is high (>90%), and the treatment effect is stable; (2) easy to install, the VOCs trap is convenient and flexible to install, and can be fixed or mobile as required (3) multi-functional integration, combining VOCs trap with desorption box and catalytic combustion box, integrating waste gas collection and purification The treatment in one package effectively solves the problems of slow air flow and pollutant accumulation in the workplace; (4) low cost, and can be flexibly matched with VOCs traps, desorption boxes, and catalytic combustion boxes according to site size and other factors, and can effectively adapt to different The use environment, without the use of a large number of pipelines, reduces the cost input.

Description of drawings

Fig. 1 is a schematic structural diagram of a VOCs trap;

Fig. 2 is the structural representation of desorption box, catalytic combustion box;

Fig. 3 is the working principle diagram of desorption box and catalytic combustion box;

Figure 4 is a schematic diagram of the structure of the activated carbon plate.

Detailed ways

The present invention will be further described now in conjunction with accompanying drawing.

As shown in Figures 1 and 4, a VOCs collection and processing device includes a VOCs catcher, and the VOCs catcher includes a main frame 1, a sub-frame 2, and an outer adsorption layer formed by surrounding a circle with several activated carbon plates. 3. The inner adsorption layer 4 formed by a circle of activated carbon plates, the inner adsorption layer 4 is surrounded by the outer adsorption layer 3, the outer adsorption layer 3 is fixed on the main frame 1, and the inner adsorption layer 4 is fixed on the sub-frame 2, The sub-frame 2 is fixedly connected with the main frame 1, and a closed photocatalytic chamber 5 is formed between the inner adsorption layer 4 and the outer adsorption layer 4. Several ultraviolet lamp tubes 6 are evenly distributed in the photocatalytic chamber 5, and the inner adsorption layer 4 is surrounded by The circulation chamber 7, the upper end of the main frame 1 is provided with an exhaust port 8 communicating with the circulation chamber 7, and a fan 9 is fixed in the exhaust port 8, and the fan 9 makes a negative pressure in the circulation chamber 7, and the outside of the outer adsorption layer 3 is covered with a filter Net 10, filter screen 10 is fixed on the main frame 1.

The activated carbon plate includes grid-like hangers 12 and honeycomb activated carbon 13 located in each grid 12 , and the honeycomb activated carbon 13 matches the grid 12 .

Since the honeycomb activated carbon 13 in the VOCs trap will be saturated after absorbing a certain amount of VOCs, the subsequent adsorption capacity will weaken until it fails. Like this just must constantly change the honeycomb activated carbon 13 in the activated carbon plate.

As shown in Figure 2 and Figure 3, in order to reduce the use cost of consumable honeycomb activated carbon 13, and at the same time to treat VOCs more thoroughly. Add desorption box 14 and catalytic combustion box 15 for supporting use in the VOCs collection and treatment device, the desorption box 14 is provided with an air inlet 16 and an air outlet 17, and the desorption box 14 is provided with a honeycomb activated carbon 13 The network frame 18, the network frame 18 divides the interior of the desorption box into an air inlet chamber 19 and an air outlet chamber 20, the air inlet 16 communicates with the air inlet chamber 19, and the air outlet 17 communicates with the air outlet chamber 20, and the catalytic combustion box 15 is provided with There is an inlet 21 and an outlet 22. The inside of the catalytic combustion chamber 15 is provided with a primary catalytic chamber, a combustion chamber 23, and a secondary catalytic chamber. The primary catalytic chamber and the secondary catalytic chamber are respectively equipped with a honeycomb-shaped noble metal catalyst 24, and the combustion chamber 23 A burner 25 is installed in the middle, the primary catalytic chamber is connected to the inlet 21, the secondary catalytic chamber is connected to the outlet 22, the outlet 22 is connected to the gas distributor 26, one side of the gas distributor 26 is connected to the chimney 27, and the other way passes through the detachable first Air pipe 28 communicates with the air inlet 16 of desorption box 14, and the gas outlet of desorption box 14 communicates with the inlet 21 of catalytic combustion box 15 through detachable second air pipe 29, and desorption fan 30 is installed on the second air pipe 29, and the inlet 21 is connected with make-up fan 31.

The active components of the honeycomb noble metal catalyst 24 are precious metal platinum, palladium, and platinum palladium noble metal catalyst, which has the characteristics of excellent high temperature resistance and low light-off temperature, can reduce the energy consumption of the catalytic combustion box 15, and improve the treatment efficiency of VOCs. It can improve the decomposition efficiency of VOCs and accelerate the decomposition speed, thereby reducing the energy consumption of the catalytic combustion box 15 and improving the processing efficiency of VOCs.

A heat recovery box 32 is provided between the desorption fan 30 and the inlet 21 of the catalytic combustion box 15, and a heat recovery cavity 34 connecting the desorption fan 30 and the inlet 21 of the catalytic combustion box 15 is provided in the heat recovery box 32, and the gas distribution A cooling fin 33 is installed between the device 26 and the chimney 27, and the cooling fin 33 is located in the heat recovery cavity 34. The heat released by the cooling fins 33 is used to preheat the VOCs-containing gas entering the catalytic combustion box 15, thereby improving the catalytic decomposition efficiency of VOCs.

An exhaust fan 36 is installed on the chimney 27 .

Desorption blower fan 30, catalytic combustion box 15, heat recovery box 32, make-up fan 31, chimney 27 are all installed on a movable mobile car 37. Larger-scale enterprises can set a mobile car 37 that contains catalytic combustion box 15 and heat recovery box 32 in the factory area, set one or more fixed desorption boxes 14, and set a plurality of VOCs catchers. The collection and treatment of VOCs in the factory area can reduce the cost as much as possible and improve the utilization efficiency of equipment.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative work. Technical solutions that can be obtained through logical analysis, reasoning or limited experiments based on the concept of the invention should be within the scope of protection determined by the claims.

Claims (6)

1. A VOCs collection and processing device, characterized in that it includes a VOCs catcher, and the VOCs catcher includes a main frame, a subframe, an outer adsorption layer formed by surrounding a plurality of activated carbon plates, and a plurality of activated carbon plates. The inner adsorption layer formed in a circle, the inner adsorption layer is surrounded by the outer adsorption layer, the outer adsorption layer is fixed on the main frame, the inner adsorption layer is fixed on the sub-frame, the sub-frame is fixedly connected with the main frame, the inner adsorption layer and the A closed photocatalytic chamber is formed between the outer adsorption layers. Several ultraviolet lamps are evenly distributed in the photocatalytic chamber. The middle part of the inner adsorption layer forms a circulation cavity. There is a fan, and the fan creates a negative pressure in the circulation chamber, and the outer side of the outer adsorption layer is covered with a filter screen, which is fixed on the main frame. 2. The VOCs collection and processing device according to claim 1, wherein the activated carbon plate includes a grid-shaped hanger and honeycomb activated carbon located in each grid, and the honeycomb activated carbon matches the grid. 3. VOCs collection and treatment device as claimed in claim 2, is characterized in that, described VOCs collection and treatment device also comprises desorption box, catalytic combustion box, and described desorption box is provided with air inlet and gas outlet, The desorption box is provided with a grid frame for placing honeycomb activated carbon. The grid frame divides the inside of the desorption box into an air inlet chamber and an air outlet chamber. There are inlets and outlets. The catalytic combustion box is equipped with a primary catalytic chamber, a combustion chamber, and a secondary catalytic chamber in sequence. The primary catalytic chamber and the secondary catalytic chamber are respectively equipped with honeycomb-shaped precious metal catalysts, and a burner is installed in the combustion chamber. , the primary catalytic chamber is connected to the inlet, the secondary catalytic chamber is connected to the outlet, and the outlet is connected to a gas distributor. The gas outlet of the box is connected to the inlet of the catalytic combustion box through a detachable second air pipe, a desorption fan is installed on the second air pipe, and a supplementary fan is connected to the inlet. 4. The VOCs collection and treatment device according to claim 3, wherein the active components of the honeycomb noble metal catalyst are noble metals platinum and palladium. 5. The VOCs collection and processing device as claimed in claim 3, characterized in that, a heat recovery box is provided between the inlet of the desorption fan and the catalytic combustion box, and a heat recovery box is provided to connect the desorption fan and the catalytic combustion box respectively. In the heat recovery cavity at the inlet of the combustion box, a cooling fin is installed between the gas distributor and the chimney, and the cooling fin is located in the heat recovery cavity. 6. The VOCs collection and processing device according to claim 5, wherein the desorption fan, catalytic combustion box, heat recovery box, make-up fan, and chimney are all installed on a movable mobile vehicle.