Product overview

Adsorption recovery is mainly to use adsorption materials to adsorb the organic solvent in the waste gas, and then desorption to recycle the organic solvent. In organic waste gas treatment process, adsorption is one of the methods with good treatment effect and wide application. Adsorbents include activated carbon, diatomite, zeolite and so on, among which activated carbon is the most widely used. Through the adsorption system, not only the VOCs concentration in the exhaust gas can be greatly reduced, and the exhaust gas can be discharged up to the standard, but also the collected materials can be reused for production through desorption, so as to realize the material recycling and reduce the material consumption.

Process principle description

Adsorption: the waste gas containing VOCs passes through the adsorbent bed, VOCs are adsorbed in the microporous structure of the adsorbent, and the clean gas is discharged into the atmosphere.

Desorption: when the adsorbent is saturated, it loses its adsorption function and needs to be regenerated. The adsorbent is mainly gasified by heat source and then carried out by the carrier.

Purge: in the process of heating and gasification of adsorbate, the adsorbent is also heated correspondingly. Low temperature is conducive to adsorption, so it is necessary to reduce the temperature of adsorbent.

Product features and advantages

Advanced design concept: system integration, standardized / modular design makes the construction period more flexible / turnkey project, so that customers can leave the project to expert.

Large adsorption capacity: fast adsorption and regeneration, high adsorption efficiency and high recovery rate

Excellent and efficient operation performance: processing efficiency is above 90%.

Reliable safety performance: multiple monitoring and warning / multiple safety interlock to ensure efficient and safe operation.

Convenient and fast network interaction performance: remote control, real-time online monitoring.

Simple and efficient operation performance: modular management, programmed control, automatic operation / simple, efficient, fast, easy maintenance.

Application industry

It is suitable for pharmaceutical, film coating, painting, high strength and high modulus polyethylene (PE fiber and diaphragm), semiconductor Polymer materials, packaging printing, leather making (superfine fiber), petrochemical industry, etc.

Product overview

（Activated carbon fiber (ACF) adsorption recovery device is a device which uses activated carbon fiber (ACF) as adsorption material, through advanced, efficient, safe and reliable process, mechatronics automatic control technology to treat the organic waste gas from various industries in the production process, and fully recover the organic solvent in the industrial waste gas.

1.The adsorber can be divided into four cores, eight cores, ten cores and twelve cores.

2.Applicable conditions waste gas component: single component, with recycling value.

Process principle description

ACF adsorber (attached)

After the organic waste gas enters the adsorber, it circulates through the following three processes.

Adsorption process: the organic solvent in the exhaust gas is adsorbed on the surface of ACF adsorption material.

Desorption process: the organic solvent on the surface of the adsorption material is desorbed by water vapor, and then condensed and recovered.

Drying process: hot air or room temperature air is introduced to dry the adsorption material, remove the water on the surface, and reduce the temperature at the same time.

Product features and advantages

Application industry

It is suitable for organic gas recovery from chemical, pharmaceutical, polymer materials, hydrogen peroxide, insulating materials and other industries.

Component: single component, with recycling value.

Product overview

Adsorption concentration unit is a new generation of VOCs treatment equipment independently developed by Huashijie. It is a method that organically combines the adsorption concentration unit and the thermal oxidation unit. It is mainly aimed at the organic waste gas with large air volume and low concentration. After adsorption purification and desorption, it is converted into organic waste gas with small air volume and high concentration for thermal oxidation treatment, and the heat released by organic matter combustion is effectively utilized.

Process principle description

Process schematic diagram

Technological features

Characteristics of molecular sieve rotor + RTO combination process:

Oxidation temperature ~ 800 ℃

The heat transfer efficiency is more than 95% when the regenerative ceramic is used as the heat exchanger

The treatment efficiency is 90% - 99%

The floor area is relatively moderate

Maximum temperature resistance ~ 1000 ℃

Can deal with sulfur, halogen and other organic substances

Suitable for continuous operation

Characteristics of molecular sieve rotor + CO combination process：

Oxidation temperature ~ 300 ℃

Tube or plate type heat exchanger is used, and the heat exchange efficiency is about 65%

Treatment efficiency 90% - 99%

The floor area is relatively small

Maximum temperature resistance ~ 500 ℃

Cannot deal with sulfur, halogen and other organic substances

Suitable for intermittent operation

Application industry

Exhaust gas treatment of various painting workshops (automobile manufacturing, shipbuilding, bicycle manufacturing, aircraft manufacturing, metal products, etc.)

Exhaust gas treatment of various printing workshops (gravure printing, building decoration material printing, other printing processes)

Exhaust gas treatment of aluminum profile production and coating process

Exhaust gas treatment in the manufacturing process of various electronic products

Exhaust gas treatment in the manufacturing process of semiconductor integrated circuit and liquid crystal display (LCD)

Exhaust gas treatment of lithium ion battery manufacturing (electrode forming process, electrolyte filling process)

Exhaust gas treatment in the production process of resin, rubber, tire and other products

Exhaust gas treatment of volatile organic compounds from automobile repair shop and dry cleaning shop

Treatment of exhaust gas containing nitrogen, sulfur, chlorine and other impurities

Product overview

Honeycomb activated carbon adsorption treatment of organic waste gas is to make use of the characteristic of activated carbon micropores that can absorb organic substances to absorb the organic waste gas of large volume low concentration in the organic solvent to activated carbon and concentrated it, the clean gas directly discharged after adsorption purification. Catalytic combustion desorption is to heat the adsorbed organic solvent in the activated carbon to the boiling point by using the hot air generated from the decomposition of organic waste gas in catalytic combustion, and then introduce the concentrated high concentration waste gas into the catalytic combustion device for thermal oxidation reaction and discharge after reaching the standard.

Air volume: 5000-100000 nm 3 /h

Components: organic waste gas

Concentration: ≤ 1000mg/nm 3

Process principle description

Honeycomb activated carbon adsorption bed

The principle of honeycomb activated carbon adsorption catalytic combustion desorption is to make use of the strong adsorption characteristic of activated carbon and low boiling point of organic solvent, first use activated carbon adsorption, when the activated carbon adsorption reaches saturation, start the catalytic combustion device, use electric heating to produce a small amount of hot air about 60 ~ 120 ℃ to heat the saturated activated carbon, so that the organic solvent in the activated carbon reaches boiling point to desorption After the thermal oxidation reaction, the high concentration waste gas entering the catalytic combustion device becomes clean and harmless gas and is directly discharged, or enters the heat exchange device, and the high concentration waste gas desorbed from the activated carbon is preheated in the heat exchange device to achieve the goal It is close to the temperature of thermal oxidation, and then the thermal oxidation reaction is carried out in the catalytic combustion device. In this way, only a small amount of heat is provided by the electric heater to reach the thermal oxidation temperature, which reduces the power of the electric heater of the catalytic combustion device, makes the catalytic combustion device and the desorption process of activated carbon achieve low power operation, and reduces the operation cost.

Technological features

1.High adsorption efficiency and strong adsorption capacity

Honeycomb activated carbon has larger specific surface area, higher adsorption efficiency and stronger adsorption capacity than granular carbon and columnar carbon.

2.Wide range of application

Honeycomb activated carbon is suitable for sulfur dioxide, nitrogen oxides, nitrogen oxides, aromatic compounds and other major air pollutants, as well as various toxic and harmful gases, volatile VOC gases and organic solvents emitted by industrial and mining enterprises.

3.Small area, simple maintenance and high efficiency

Honeycomb activated carbon equipment has compact structure, small floor area, simple and convenient maintenance and management, low operation cost, and the purification rate of organic waste gas after adsorption treatment by honeycomb activated carbon method is more than 90%.

Product features and advantages

Application industry

Suitable for coating, spraying, printing, chemical industry and other industries.

Air volume: 5000 ~ 100000 Nm3 / h

Component: organic waste gas

Concentration: ≤ 1000mg / Nm3

Product overview

The basic principle of regenerative thermal oxidizer is to oxidize organic waste gas (VOCs) to CO2 + H2O at high temperature (≥ 760 ℃). The purification efficiency is as high as 99%. The high temperature gas produced by oxidation flows through the special ceramic regenerator to make the ceramic body warm up and "store heat". The next process is that the waste gas passes through the ceramic which has "stored heat" and transfers the heat of the ceramic to the waste gas. The organic waste gas passes through the ceramic as the carrier of the heat exchanger for repeated heat exchange, so as to save the fuel consumption of waste gas heating and reduce the operation cost. The heat recovery efficiency is as high as 95%。Under the condition of medium and high concentration, RTO can output waste heat and make use of it in the form of steam, hot air and hot water, so as to achieve economic benefits while meeting the environmental protection objectives.

Process principle description

Rotary RTO

Rotary RTO is to change the position of the exhaust gas into the ceramic through the rotation of the rotary wing, so as to realize the alternate conversion of the heat storage zone and the heat release zone. The ceramic regenerator is divided into 12 zones, five air inlet zones, five air outlet zones, one purging zone and one dead zone. Each heat storage zone experiences the process of heat storage, heat release and purging in turn, and works continuously.

Three bed RTO

Product features and advantages

Application industry

Suitable for painting, spraying, chemical, pharmaceutical, printing and other industries.

Air volume: 1000 ~ 1000000nm 3/h

Component: the component is complex, has no recycling value, and is difficult to reuse

Concentration:1000mg/Nm3＜concentration＜25%LEL

The inlet temperature of rotary RTO is not higher than 100℃, and that of bed RTO is not higher than 200℃

Rotary RTO requires no corrosion components in exhaust gas 

Product overview

Co uses catalytic combustion technology to make the organic waste gas burn without flame under the condition of lower starting temperature (300-400 ℃). In the process of catalytic combustion, the catalyst can reduce the activation energy, and the surface of the catalyst has adsorption function, which makes the reactant molecules concentrate on the surface to improve the reaction rate and accelerate the oxidation process. Compared with direct combustion, the catalytic combustion of organic waste gas has the characteristics of low starting temperature and low energy consumption. In some cases, no external heating is required after the ignition temperature is reached. The purification rate of organic waste gas treated by catalytic combustion is generally over 95%, and the final product is harmless CO2 and H2O (heteroatom organic compounds and other combustion products), so there is no secondary pollution. Co uses high performance catalyst, Pt and PD noble metal catalyst with ceramic support. The dispersion of noble metal active position is high, catalytic activity is high, service life is long, pressure loss is small, which reduces the total energy consumption of the whole machine.

Process principle description

CO

VOCs flow direction 1: driven by the desorption fan, low concentration VOCs gas from the cooling area of the molecular sieve rotor enters the cold side channel of the first stage heat exchanger for heat exchange, and the gas temperature rises from 60 ℃ to 200 ℃ and then flows back to the desorption sector of the molecular sieve rotor. High temperature gas desorbs a large number of VOCs molecules from the zeolite surface of the molecular sieve rotor to form high concentration VOCs, and the concentration is controlled below 10g / m3.

VOCs flow to two directions Driven by the desorption fan, the high concentration VOCs gas enters the cold side channel of the two-stage heat exchanger for heat exchange. The gas temperature rises from 120 ℃ to 300 ℃ and then enters the catalytic combustion chamber. The temperature meter in the catalytic combustion chamber checks the temperature of the VOCs gas after entering. If the temperature of the VOCs gas is lower than 300 ℃, the burner in the catalytic combustion chamber will ignite automatically to heat  the gas again until the temperature is between 300 ℃ and 350 ℃. Then VOCs gas flows through the burner and then flows through the surface of catalyst to produce flameless combustion. The organic molecules in VOCs are oxidized and decomposed into CO2 and H2O, and a lot of heat energy is released at the same time. The specific heat ratio of VOCs is about 25 ℃ / g. when the concentration of VOCs is 10g / M 3, the temperature rises 250 ℃. Therefore, the temperature of 300 ℃ VOCs increases to 550 ℃ after catalytic combustion. After catalytic combustion, VOCs gas is oxidized and decomposed into clean high temperature gas, which flows through the hot side channel of the first stage heat exchanger and the hot side channel of the second stage heat exchanger to provide them with heat energy for heat exchange in the cold side channel, and then discharged into the atmosphere through the chimney. In the later design of waste heat recovery and utilization, the high-temperature and clean gas will also be recycled to provide heat energy for Party A's production workshop, hot water supply or environmental heating supply.

Product features and advantages

Application industry

Suitable for painting, spraying, printing and other industries

Air volume: 5000 ~ 1000000nm 3 / h

Components: ethyl acetate, propyl acetate, ethanol

Concentration: 200mg / Nm3 < concentration < 1200mg / Nm3

The inlet temperature of RCO is not lower than 300 ℃, and the outlet temperature is not higher than 600 ℃

Overall introduction of the equipment

The device is an integrated box type device integrating biological trickling filter and biological filter module, spray humidification system, fan, air duct, heating device, power distribution cabinet, frequency converter, electrical appliance, instrument and PLC automatic control system. Modular and standardized design, mass production, effective cost reduction, faster delivery.

Core advantage

technological process

Huashijie biological treatment process is composed of biological trickling filtration and biological filtration. It is also called two-stage biological process. It can treat both soluble and insoluble pollutants. The rear fan is adopted, and the negative pressure inside the device works to reduce the emission of waste gas to the environment as much as possible.

The process flow of two-stage biological waste gas treatment is as follows:

After the waste gas enters the device, the biotrickling section in the device and the spray liquid exchange gas and liquid reversely on the packing surface. Most of the soluble pollutants are transferred from the gas phase to the water phase, and the spray liquid circulates. The pollutants in the water phase are used by the microorganisms attached to the packing surface, and are degraded into harmless substances through microbial life activities.

The insoluble pollutants enter the biofilter section with the waste gas, and are captured by the biofilm attached to the surface of the filler, and are digested as nutrients to further realize the harmless treatment of pollutants. The waste liquid produced by the microbial system can be discharged into the sewage system of the plant or the sewage treatment plant due to the absence of harmful substances and B / C ≥ 0.3.

working principle

The pollution substances in the waste gas components are transformed into carbon dioxide, water, polysaccharides, protein organic substances and microbial cell components, inorganic salts and other low harmful or harmless substances by using the life metabolism activities of microorganisms, so as to realize the effective treatment of the components of waste gas pollutants. The process of the transformation of pollutants in micro objects is shown in the following figure: