CN207024949U - Industrial VOC waste gas rich catalytic thermal combustion treatment system - Google Patents

Abstract

The utility model discloses an industrial VOC waste gas concentrated catalytic thermal combustion treatment system, including a spray treatment module, a drying module, a concentration module and a catalytic burner, the waste gas discharge pipe is connected to the spray treatment module, the spray treatment module is connected to the drying channel of the drying module, the drying module is connected to the concentration module, the concentration module is connected to the catalytic burner, the exhaust flue gas pipe of the catalytic burner is connected to the exhaust main pipe, and the exhaust main pipe is provided with a branch pipeline connected to the heat source interface of the drying module. The advantages and beneficial technical effects are as follows: the recycled flue gas is dried and then enters for combustion and decomposition; it is burned and degraded after being concentrated; the exhaust heat of the combustion chamber is fully recycled, the energy-saving effect is obvious, and the VOC is completely burned and degraded, and no pollution is caused to the environment.

Description

Industrial VOC waste gas rich catalytic thermal combustion treatment system

【Technical field】

The utility model relates to a waste gas treatment device, in particular to an industrial VOC waste gas concentrated catalytic thermal combustion treatment system.

【Background technique】

The drying kiln can be used to heat and dry the paint and coating on the surface of the workpiece. During the high-temperature treatment of the workpiece, the volatile organic compound (VOC) gas in the workpiece is directly discharged into the environment along with the exhaust gas, which will cause serious pollution to the environment and cause physical damage to the staff and residents in the area.

At present, the industry mainly adopts condensation method, adsorption-vacuum desorption post-absorption method, combustion method, membrane separation and other treatment methods. The existing organic waste gas treatment methods are single and complex in structure. Either the treatment effect is poor, or most of the energy is consumed. Increase processing costs.

【Content of utility model】

The purpose of this utility model is to address the above-mentioned deficiencies in the prior art, to provide a kind of industrial VOC exhaust gas concentrated catalytic thermal combustion that can eliminate the pollution of volatile organic compound (VOC) gas emission to a great extent, has a simple structure, energy saving and high efficiency, and is more environmentally friendly. processing system.

In order to achieve the above object, the utility model is achieved in the following way: the industrial VOC exhaust gas concentrated catalytic thermal combustion treatment system includes a spray treatment module, a drying module, a concentration module and a catalytic burner, and the exhaust gas discharge pipe is connected with the spray treatment module , the spray treatment module is connected to the drying channel of the drying module, the drying module is connected to the concentration module, the concentration module is connected to the catalytic burner, and the exhaust gas pipe of the catalytic burner Connecting with the discharge main pipe The discharge main pipe is provided with a branch pipeline connected with the heat source interface of the drying module.

The spray treatment module includes a treatment tower, and at least one humidification treatment chamber and a secondary dust removal chamber are arranged in sequence from bottom to top in the treatment tower, and a filter is provided between the humidification treatment chamber and the secondary dust removal chamber. The packing layers are separated; the first spray device is arranged in the secondary dust removal chamber, and the first spray device is installed above the secondary dust removal chamber; the treatment tower is provided with a flue gas inlet and a gas outlet, The flue gas inlet is connected to the humidification treatment chamber, the gas outlet is connected to the secondary dust removal chamber, a second spray device is arranged on the humidification treatment chamber, and a treatment liquid pool is arranged at the bottom of the treatment tower. The second spraying device is connected with the treatment liquid pool through a delivery pipe and a water pump.

The first spraying device or the second spraying device includes a spiral coil pipe arranged in the secondary dust removal chamber or humidification treatment chamber, and several spray heads are arranged on the spiral coil pipe, which can make the flue gas and The treatment liquid is sprayed for effective contact to remove sulfide and nitrogen oxides in the flue gas to the greatest extent.

The humidification treatment chamber is arranged in stages, and the humidification treatment chamber is divided into at least two sub-humidification treatment chambers through the auxiliary filter packing layer; .

The concentration module includes a primary concentration part and a secondary concentration part, and the primary concentration part is connected with the secondary concentration part through a purification discharge port. The flue gas is absorbed and concentrated by the first-level concentration unit, and then passed through the second-level concentration unit to absorb the concentration. The flue gas can be treated to meet the atmospheric emission standard and then discharged through the chimney.

A third adsorption module is installed in the first-stage concentration part, and the third adsorption module is installed on the rotating shaft, and the first-stage concentration part is provided with a flue gas inlet, a purification outlet, a desorption inlet, and a concentration outlet. The purification discharge port is connected to the air inlet of the secondary enrichment part, and the concentration discharge port is connected to the concentration collection box through a pipeline, and the concentration collection box is connected to the air inlet of the regenerative heat exchanger.

The secondary enrichment part includes a first adsorption module and a second adsorption module, the first adsorption module and the second adsorption module are respectively provided with an air inlet, a purification discharge port, a desorption inlet and a concentration discharge port, and the purification discharge The outlet can be directly connected to the chimney, and the purified gas that meets the emission standard is discharged through the chimney; the purification discharge port of the first-stage enrichment part is respectively connected to the air inlet of the first adsorption module and the second adsorption module, and in Valves are respectively provided on the pipelines of the air intake; valves are respectively provided on the pipelines between the purification discharge port and the chimney; the concentration discharge ports of the first adsorption module and the second adsorption module can be connected with the collection box, and Valves are respectively arranged on the pipelines connecting the concentration outlets of the first adsorption module and the second adsorption module to the converging tank; the desorption inlets of the first adsorption module and the second adsorption module are connected to the desorption inlet pipe, A valve is installed on the intake pipe.

The desorption inlet of the primary concentration part is connected to the chimney through a mixing device, and the mixing device is provided with an air input pipe for introducing air. The desorption inlets of the first adsorption module and the second adsorption module in the secondary concentration part are connected with the chimney through a mixing device. By mixing part of the treated flue gas with air for desorption, exhaust emissions can be reduced, waste heat can be recycled, and energy can be saved. In the mixing device, the volume ratio of air to flue gas is 3:1-3, preferably, the volume ratio of air to flue gas is 3:1.

Compared with the prior art, the utility model has the advantages and beneficial technical effects as follows: all the high-temperature flue gas containing VOC gas is desulfurized and removes large particles through the spray treatment module, reducing the emission of flue gas dust; The waste gas after leaching treatment is dried with the recycled flue gas and then burned and decomposed, which can reduce the processing burden and improve the combustion effect; all the high-temperature flue gas containing VOC gas is burned and degraded after concentration treatment, which can reach almost zero emission standards ; The energy-saving effect of the catalytic burner is obvious, and the VOC is completely degraded by combustion, and no longer pollutes the environment.

【Description of drawings】

Fig. 1 is the system flow diagram of the industrial VOC waste gas rich catalytic thermal combustion treatment system of the utility model;

Fig. 2 is a structural schematic diagram of the spray treatment module in the industrial VOC waste gas concentrated catalytic thermal combustion treatment system of the utility model

Fig. 3 is a structural schematic diagram of the enrichment module in the industrial VOC waste gas enriched catalytic thermal combustion treatment system of the present invention.

【detailed description】

The utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments.

The industrial VOC waste gas concentrated catalytic thermal combustion treatment system, as shown in Figure 1, includes a spray treatment module 2, a drying module 7, a concentration module 8 and a catalytic burner 6, and the waste gas discharge pipe 1 of the furniture spraying workshop and the spray The processing module 2 is connected to handle possible sulfides and remove large particles; the spray processing module 2 is connected to the drying channel of the drying module 7 and is used to dry the waste gas after the spray treatment to reduce the processing burden, improve the combustion effect; the drying module 7 is connected to the enrichment module 8, the enrichment module 8 is connected to the catalytic burner 6, and the exhaust gas pipe of the catalytic burner 6 is connected to the exhaust main pipe, The discharge main pipe is discharged through the chimney; the discharge main pipe is provided with a branch pipeline connected with the heat source interface of the drying module 7 .

A regulating valve 14 is provided between the drying module 7 and the connecting pipe of the catalytic burner 6 . A smoke distribution box 9 is arranged on the discharge main pipe, and the branch pipeline is connected with the smoke distribution box 9 .

Described catalytic burner 6 can be photocatalytic burner, can directly buy the mature product sold on the market, and it mainly utilizes photocatalyst titanium dioxide (TiO2) to absorb the light energy of external radiation, make it directly convert into chemical energy. Some organic substances that are difficult to be oxidized by ozone, such as chloroform, carbon tetrachloride, and hexachlorobenzene, can be effectively decomposed, so it has special significance for organic substances that are difficult to degrade. The effective oxidant for photocatalysis is hydroxyl radicals (HO ), the oxidation of hydroxyl radicals (HO) is higher than that of common ozone, hydrogen peroxide, potassium permanganate, hypochlorous acid, etc.

The drying module 7 is a heat exchanger, which includes a drying channel and a heat exchange channel, the drying channel is connected to the outlet of the spray treatment module 2, and the heat exchange channel is connected to the branch pipeline for Recycling exhaust waste heat to dry exhaust gas, energy saving, and the effect is obvious.

The spray treatment module, as shown in Figure 2, includes a treatment tower, in which at least one humidification treatment chamber 11 and a secondary dedusting chamber 12 are sequentially arranged from bottom to top in the treatment tower, and the humidification treatment chamber 11 There is a filter packing layer 13 between the secondary dust removal chamber 12; a first spray device 53 is arranged in the secondary dust removal chamber 12, and the first spray device 53 is installed in the secondary dust removal chamber 12 above; the first spraying device 53 includes a spiral coil tube with the secondary dust removal chamber, and several shower heads are arranged on the spiral coil tube, and the first spraying device 53 passes through the conveying pipe and the first The water pump 52 is connected to the water storage tank 51; the side wall of the treatment tower is provided with a flue gas inlet near the bottom to connect with the exhaust gas discharge pipe 1, the bottom is provided with a drain port 16, and the top of the upper part is provided with an air outlet, and the flue gas inlet is connected to the humidification treatment chamber 11. The air outlet communicates with the secondary dust removal chamber. A treatment liquid pool 41 is provided at the bottom of the treatment tower for collecting the treatment liquid flowing down from the water outlet 16 . The drain port 16 can be placed below the liquid level in the treatment liquid pool 41, so as to avoid the overflow of flue gas. The upper part of the humidification treatment chamber 11 is provided with a second spray device 43, and the second spray device 43 is connected to the treatment liquid pool 41 through a delivery pipe through a second water pump 42 to recycle the treatment in the treatment liquid pool 41. The liquid sprays the flue gas entering from the flue gas inlet with a water bath to effectively remove sulfide and active nitrogen oxides in the flue gas. The spraying device 43 includes a spiral coil in the humidification treatment chamber 11, and a number of spray heads are arranged on the spiral coil, so that the smoke can be effectively contacted with the spray of the treatment liquid, and the dust in the smoke can be removed to the greatest extent. Sulfides and nitrogen oxides.

Wherein, the treatment liquid pool 41 is filled with a recyclable treatment liquid, and the treatment liquid may be an alkali solution, preferably lime water. A water level monitoring sensor is arranged in the treatment liquid pool 41, and when the water level of the treatment liquid in the treatment liquid pool 41 drops to a certain level, an alarm is sent or a treatment liquid is added.

The thickness of the filter packing layer 13 is 25-40 cm, which is fixed on the side wall of the treatment tower. The filter packing layer 13 is filled with Raschig rings. The size of the Raschig ring is 36mm-40mm. The ceramic Raschig ring is preferred, the ceramic wall thickness is 4mm-8mm, the price is low, and the filtering effect is obvious. Most preferably, the thickness of the filter packing layer 13 is 33-36 cm.

For the spray treatment module, on the basis of the above, the humidification treatment chamber 11 is arranged in stages, and the inside of the humidification treatment chamber 11 is divided into at least two sub-humidification treatment chambers (one sub-humidification treatment chamber) by auxiliary filter packing layer 15 chamber and secondary sub-humidification treatment chamber). The spraying devices 43 are respectively arranged in the first-level sub-humidification treatment chamber and the second-level sub-humidification treatment chamber. The flue gas is first sprayed through the primary humidification treatment chamber, then filtered through the auxiliary filter packing layer 15, and then enters the secondary humidification treatment chamber for spray treatment, then humidified through the filter packing layer 13, and then enters the secondary dust removal chamber 12 for dust removal deal with.

The auxiliary filter packing layer 15 has a thickness of 16-25 cm, and is fixed on the side wall of the treatment tower. Pall rings are filled in the auxiliary filter packing layer 15 . Using the Pall ring can effectively save 20%-40% of packing volume. Most preferably, the thickness of the filter packing layer 13 is 17-23 cm.

The concentration module, as shown in FIG. 3 , includes a primary concentration part and a secondary concentration part, and the primary concentration part is connected to the secondary concentration part through a purification discharge port. The flue gas is absorbed and concentrated by the first-level concentration unit, and then passed through the second-level concentration unit to absorb the concentration. The flue gas can be treated to meet the atmospheric emission standard and then discharged through the chimney.

A third adsorption module is installed in the first-stage concentration part, and the third adsorption module is installed on the rotating shaft, and the first-stage concentration part is provided with a flue gas inlet, a purification outlet, a desorption inlet, and a concentration outlet. The purification discharge port is connected to the air inlet of the secondary enrichment part, and the concentration discharge port is connected to the concentration collection box through a pipeline, and the concentration collection box is connected to the inlet of the regenerative heat exchanger 4 . The flue gas containing VOC enters from the flue gas inlet, passes through the adsorption surface of the third adsorption module, and then is discharged through the purification discharge port, which can absorb and remove 60-70% of the VOC in the flue gas; when desorption is required, the desorption gas Entering from the desorption inlet, the third adsorption module rotates around the rotating shaft, so that the desorption surface of the third adsorption module faces the desorption inlet, and the desorption gas will elute the high-concentration VOC adsorbed in the third adsorption module, and then enter the concentration collection box from the concentration discharge port . The primary enrichment part is of rotary wheel type, simple in structure, easy to use, and can work continuously.

The secondary enrichment part includes a first adsorption module and a second adsorption module, the first adsorption module and the second adsorption module are respectively provided with an air inlet, a purification discharge port, a desorption inlet and a concentration discharge port, and the purification discharge The outlet can be directly connected to the chimney, and the purified gas that meets the emission standard is discharged through the chimney. The purification outlets of the primary enrichment part are respectively connected to the air inlets of the first adsorption module and the second adsorption module, and valves are respectively arranged on the air inlet pipes. Valves are respectively arranged on the pipes between the purification outlet and the chimney. The concentration outlets of the first adsorption module and the second adsorption module may be connected to a collection box, and valves are respectively arranged on the pipelines connecting the concentration outlets of the first adsorption module and the second adsorption module to the collection box. The desorption inlets of the first adsorption module and the second adsorption module are connected to a desorption intake pipe, and a valve is installed on the desorption intake pipe.

When the first adsorption module and the second adsorption module are working, they are controlled by valves. The first adsorption module performs adsorption and filtration, while the second adsorption module performs desorption, and then switches to perform desorption in the first adsorption module. Adsorption filtration is carried out in the second adsorption module. After being adsorbed and filtered, the flue gas to be treated can reach the emission standard, and is directly discharged into the chimney through the purification outlet. The desorbed eluate gases from the first and second adsorption modules contain higher concentrations of volatile organic compounds (VOCs). In this way, the gas treatment amount can be reduced, the fuel consumption can be reduced, the cost can be saved, and it is more energy-saving and environmentally friendly.

The desorption inlet of the primary concentration part is connected to the chimney through a mixing device, and the mixing device is provided with an air input pipe for introducing air. The desorption inlets of the first adsorption module and the second adsorption module in the secondary concentration part are connected with a chimney through a mixing device. By using part of the flue gas to mix with air for desorption, exhaust gas emissions can be reduced, waste heat can be recovered and utilized, and energy can be saved. In the mixing device, the volume ratio of air to flue gas is 3:1-3, preferably, the volume ratio of air to flue gas is 3:1.

The first-stage enrichment part can be a zeolite runner, and the zeolite runner can further increase the concentration ratio, improve the VOC removal efficiency and reduce the processing cost by adjusting parameters such as desorption temperature and desorption gas flow rate, so as to reduce the concentration after concentration. Dispose of equipment, reduce energy consumption. A third adsorption module is arranged in the primary concentration part, and the third adsorption module is filled with zeolite. The concentration of VOCs in the exhaust gas can be increased through the first-stage enrichment part, which can reduce the fuel consumption of the combustion and decomposition furnace. Generate harmless CO ₂ and H ₂ O. It can make the VOC inlet concentration reach the self-sustaining concentration of the regenerative incineration system, without adding auxiliary fuel, and greatly reduce energy consumption; it is easy to realize fully automatic control and has high safety; the concentration of waste gas to be treated can fluctuate greatly.

The secondary concentration part adopts dual gas paths to work continuously, and two adsorption beds (the first adsorption module and the second adsorption module) are used alternately. First, use one of the adsorption beds to absorb the organic waste gas, stop the adsorption when it is almost saturated, and then use the desorption gas to desorb the organic matter from the activated carbon to regenerate the activated carbon; the desorbed organic matter has been concentrated (the concentration is dozens of times higher than the original one) ) and sent to the combustion decomposition furnace for direct combustion into carbon dioxide and water vapor. When the concentration of organic waste gas reaches more than 500PPm, the organic waste gas can maintain spontaneous combustion in the combustion chamber without external heating. The exhaust gas after combustion passes through the heat exchanger to heat the air, and the hot air is sent to the adsorption bed for the regeneration of activated carbon. In this way, the heat energy required for combustion and adsorption can be satisfied, and the purpose of energy saving can be achieved. After regeneration, it can enter the next adsorption; during desorption, the purification operation can be carried out with another adsorption bed, which is suitable for both continuous operation and discontinuous operation.

Wherein, the first adsorption module and the second adsorption module may be activated carbon filters, or honeycomb activated carbon.

The preferred specific embodiments of the present utility model have been described in detail above, and it should be understood that those skilled in the art can make many modifications and changes according to the concept of the present utility model without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims .

Claims (7)

1. the industrial dense catalytic thermal burning processing system of VOC waste gas, it is characterised in that：Including spray process module, irradiation modules, dense Contracting module and catalytic burner, exhaust emission tube are connected with the spray process module, and the spray process module is done with described The dry channel connection of dry module, the irradiation modules are connected with the concentration module, and the concentration module is fired with the catalysis Burner connects, and the discharge fume pipe of the catalytic burner is connected the discharge manifold with discharge manifold and is provided with a branch line It is connected with the thermal source interface of the irradiation modules；The spray process module, including a treating column, set in the treating column Put down it is supreme be sequentially provided with least one humidification process chamber and final dusting chamber, between the humidification process chamber and final dusting chamber It is separated by provided with filter packing layer；The first spray equipment is set in the final dusting intracavitary, first spray equipment is installed on The top of the final dusting chamber；The treating column is provided with gas approach and gas outlet, and the gas approach connection is described to be added Wet process chamber, the gas outlet connect the final dusting chamber, the second spray equipment, institute are provided with the humidification process chamber State treating column bottom and processing liquid pool is set, second spray equipment is connected by delivery pipe through water pump with the processing liquid pool.

2. the dense catalytic thermal burning processing system of industrial VOC waste gas as claimed in claim 1, it is characterised in that：First spray Shower device or the second spray equipment include setting the final dusting chamber or the spiral coil of humidification process intracavitary, in the spiral Some spray heads are provided with coil pipe.

3. the dense catalytic thermal burning processing system of industrial VOC waste gas as claimed in claim 2, it is characterised in that：At the humidification Manage chamber to set for classification, the humidification process intracavitary is divided into minimum two sub- humidification process chambers by aided filter packing layer； The sub- humidification process chamber of one-level and the sub- humidification process intracavitary of two level set the spray equipment respectively.

4. the dense catalytic thermal burning processing system of industrial VOC waste gas as claimed in claim 1, it is characterised in that：The enrichment mode Block includes primary concentration portion and secondary concentration portion, and the primary concentration portion is connected by purifying floss hole with secondary concentration portion；Cigarette Gas can reach fume treatment air discharge by passing through secondary concentration portion adsorption concentration after primary concentration portion Adsorption Concentration again Pass through smoke stack emission after standard.

5. the dense catalytic thermal burning processing system of industrial VOC waste gas as claimed in claim 4, it is characterised in that：The one-level is dense 3rd adsorption module is set in contracting portion, and the 3rd adsorption module is installed in rotating shaft, and is provided with the primary concentration portion Gas approach, purification floss hole, solution suction side and concentration outlet, the purification floss hole and the air inlet in secondary concentration portion Connection, concentration floss hole are connected by pipeline with concentration collector, the air inlet of the concentration collector and heat regenerator Connection.

6. the dense catalytic thermal burning processing system of industrial VOC waste gas as claimed in claim 5, it is characterised in that：The two level is dense Contracting portion includes the first adsorption module and the second adsorption module, set respectively on first adsorption module and the second adsorption module into Gas port, purification floss hole, solution suction side and concentration outlet, the purification floss hole can directly be connected with chimney, will purify The gas for meeting discharge standard afterwards passes through smoke stack emission；The purification floss hole in the primary concentration portion adsorbs with described first respectively The connection of module and the second adsorption module air inlet, and it is respectively arranged with valve on the pipeline of air inlet；The purification floss hole Valve is respectively arranged with pipeline between chimney；The concentration outlet of first adsorption module and the second adsorption module can To be connected with collector, and in the pipe that is connected with collector of concentration outlet of first adsorption module and the second adsorption module Valve is respectively arranged with road；The solution suction side connection desorption air inlet pipe of first adsorption module and the second adsorption module, Valve is installed in the desorption air inlet pipe.

7. the dense catalytic thermal burning processing system of industrial VOC waste gas as claimed in claim 6, it is characterised in that：The one-level is dense The solution suction side in contracting portion is connected by mixing arrangement with chimney, and the mixing arrangement is provided with the air input for being used to introduce air Pipe.