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Jiangxi Longjing Environmental Engineering Co., Ltd.

Phone: 0791-88593088

Fax: 0791-88593098

Mobile: 18979156347

18879101596 (Mr. Fu)

Email: JXLJHB@163.com

Website: 333kf.cn

Address: Building 153, Phase II, Jiahai Industrial Park, High-tech Development Zone, Nanchang


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Organic waste gas treatment project

I. VOCs waste gas treatment-low temperature plasma

1 Overview

Low-temperature plasma is the fourth state of matter after solid, liquid, and gaseous states. When the applied voltage reaches the ignition voltage of the gas, gas molecules are broken down, producing a mixture including electrons, various ions, atoms and free radicals . Although the electron temperature is high during the discharge, the temperature of the heavy particles is very low, and the whole system is in a low temperature state, so it is called low temperature plasma. Low-temperature plasma degradation of pollutants is the use of these high-energy electrons, free radicals and other active particles and pollutants in the exhaust gas, so that the pollutant molecules are decomposed in a very short time, and various subsequent reactions occur to achieve the degradation of pollutants the goal of. Low-temperature plasma generation methods include glow discharge, corona discharge, dielectric barrier discharge, radio frequency discharge, sliding arc discharge, jet discharge, atmospheric pressure glow discharge, and sub-atmospheric pressure glow discharge.

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2. Product structure characteristics:

● Strong adaptability, can run continuously and stably for 24 hours at -50 ~ 150 ℃ and saturated humidity, with good treatment effect;

● Minimum wind resistance and low motor power; Small equipment footprint and light weight;

● The main products are low-molecular harmless substances such as water and carbon dioxide, without the addition of any auxiliary agents, and no secondary pollution;

● High degree of automation, easy operation, equipment start and stop very quickly, open as needed. For discontinuities in some chemical production, it can be opened during production, and the operation will be stopped during non-production, which can save a lot of energy. Combination of multiple technologies;

● Long service life, the equipment shell is made of stainless steel, copper, molybdenum, epoxy resin and other materials, has strong oxidation resistance, and can be used continuously for more than 10 years under acidic / alkaline / humid conditions;

● Safety, the equipment can use 24V / 36V power supply, safe and reliable;

● Can be equipped with high-quality imported plasma generator, low frequency of maintenance and replacement.

3. Equipment application range:

Application areas: spraying, painting, chemical, casting, fume, pharmaceuticals, pesticides, tobacco, flavors and fragrances, electronics, plastics, plastics, rubber, asphalt, packaging, leather, resins, adhesives, composite boards, paper, textile, Printing and dyeing, food, feed, slaughter, meat processing, breeding, garbage treatment, sewage treatment, etc.

Application of exhaust gas types: acetone, methyl ethyl ketone, ethyl acetate, formaldehyde, acetaldehyde, ethyl acetate, benzene series, benzene, toluene, xylene, styrene, alkane, olefin, alkyne, aromatic hydrocarbon, phenol, hydrogen sulfide , Thiols, thioethers, ammonia, amines, indole, nitro and other odors and exhaust gases.

Applicable parameter types: high air volume and low concentration of industrial organic waste gas treatment.

4. Process principle and process:

(1) Process principle: When the exhaust gas passes through the plasma generator, in a high-voltage pulsed electric field, an unbalanced high-energy low-temperature plasma is obtained at normal temperature through high-voltage pulse corona discharges with steep front and rear edges and extremely narrow pulse widths (ns). That is, a large number of high-energy electrons (approximately 5eV) and hydroxyl radicals (· OH, · HO2, · O) with strong oxidizing properties and high-energy active particles such as highly oxidizing O3 are used to inelastically collide with organic molecules in the exhaust gas. The chemical bonds of organic molecules are broken, a series of complex oxidation and degradation chemical reactions occur, and finally the toxic and harmful organic substances in the exhaust gas are converted into harmless carbon dioxide and water, so that the exhaust gas is purified.

(2) Process description: After preliminary pretreatment of the exhaust gas, the exhaust gas enters the VOC low-temperature plasma purification equipment and performs a series of complex ionic chemical reactions with highly oxidizing high-energy plasma to oxidize and degrade organic pollutants into harmless Carbon dioxide and water, etc., and finally undergo deep oxidation treatment by an oxidizer. The purified exhaust gas is pumped to the exhaust pipe by the fan, and meets the standard emission.

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Second, VOCs waste gas treatment-photo oxygen catalytic method

1 Overview

Nano-titanium dioxide photocatalyst uses ultraviolet light (UV) as the light source. After irradiating the catalyst material titanium dioxide, the electrons in the valence band are excited by ultraviolet rays, transition to the conduction band to form free electrons, and positively charged holes are formed in the valence band. Electron-hole pairs. Utilizing the oxidizing ability of the generated holes and the reducing ability of free electrons, the photocatalyst material and the oxygen and water in the air undergo an oxidative reaction to become a hydroxyl radical with a strong oxidation effect. Hydroxyl radicals have a high oxidizing capacity and can react with organic compounds in the oxidation process, that is, in the presence of oxygen, the reaction process is as follows: the atomic group of the organic compound intermediate generates an atomic chain reaction with the oxygen molecules, and oxygen is consumed, In the end, organic compounds are decomposed into carbon dioxide and water. At the same time, oxygen and hydrogen radicals can easily damage the cell membrane of bacteria and cause the loss of cytoplasm, and then oxidize the nucleus until the cells are killed and sterilized.

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2. Scope of application:

Application fields: spraying, painting, chemical, pharmaceutical, pesticide, tobacco, flavor and fragrance, electronics, plastic, plastic, rubber, ink, printing, asphalt, packaging, leather, resin, adhesive, composite board, papermaking, textile, printing and dyeing , Food, feed, slaughter, meat processing, breeding, garbage treatment, sewage treatment, etc.

Application of exhaust gas types: benzene, toluene, xylene, styrene, alkanes, alkenes, alkynes, aromatic hydrocarbons, phenol, acetone, methyl ethyl ketone, ethyl acetate, formaldehyde, acetaldehyde, ethyl acetate, benzene series, hydrogen sulfide , Thiols, thioethers, ammonia, amines, indole, nitro and other odors and exhaust gases.

Applicable parameter types: high air volume and low concentration of industrial organic waste gas treatment.

3. Product structure characteristics:

● High efficiency: The number of exhaust UV purification modules can be flexibly configured according to the amount of exhaust gas collected, the wind speed and the concentration of the exhaust gas, and the purification treatment efficiency is high.

● Simple installation and maintenance: It adopts drawer-type plug-in installation, uniform accessories, convenient installation and maintenance. Spare parts can be maintained or replaced online, convenient and flexible, easy to operate, practical and effective.

● Stability: It can work continuously 24 hours a day, fully automatic operation, stable and reliable operation.

● Module design, flexibility and simplicity: Fully consider the instability and complexity of various types of exhaust gas properties, and provide great feasibility, reliability and flexibility for engineering design, supporting, installation, commissioning, maintenance and other aspects.

● Low operating cost: The equipment has no mechanical action, low energy consumption, no special management and daily maintenance, only regular inspection.

● Wide adaptability: The equipment is small in size and light in weight. At the same time, it can be customized according to the actual situation on the site, which can be applied to any terrain space.

● Safe, reliable, and adaptable: Due to the photolysis principle, the module adopts flameproof processing, which eliminates hidden dangers. It has good fireproof, explosion-proof, and anticorrosive performance (all stainless steel casing). The equipment performance is safe and stable, and its service life is more than 10 years.

● Environmental protection: The equipment runs without noise and does not produce secondary pollution

4. Process principle and process:

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In the photocatalytic oxidation equipment, the ozone and • OH (hydroxyl radicals) produced by the reaction of high-energy ultraviolet light beams with air and TiO2 catalysts synergistically decompose and oxidize organic macromolecules. At the same time, the macromolecules break their chain structure under the action of ultraviolet rays. The macromolecular organic compounds are converted into small molecular compounds or completely mineralized to generate water and CO2, which are discharged into the atmosphere through exhaust pipes after reaching the standard.

Third, VOCs exhaust gas treatment-Regenerative thermal combustion RTO

1 Overview

Regenerative Thermal Oxidizer (RTO for short) is an organic waste gas treatment equipment that combines high temperature oxidation with thermal storage technology. This equipment can effectively reduce heat loss and energy consumption resources, and at the same time greatly reduce the exhaust gas temperature after purification. The common form of RTO equipment is two-chamber and three-chamber structures. When dealing with large air volumes, it can also be designed into five-chamber, seven-chamber and other structural forms.

2. Product structure characteristics:

The company's continuous technical innovation in terms of equipment safety, economy, removal rate, etc., makes the product have the following characteristics:

● High purification efficiency, up to 99%, no buffer tank required;

● Using new ceramic heat storage system, the heat utilization efficiency is higher than 97%;

● Auxiliary heating is not needed, and the running cost is low;

● Compact system structure and small footprint;

● Long residence time, full combustion and complete decomposition;

● No secondary pollution such as NOx;

● The range of air volume is 5,000-200,000 cubic meters / hour;

● Small dead zone in the furnace and small pressure loss;

● The system runs stably, safely and reliably;

● Intelligent monitoring of various data in the equipment, accurate control of reaction temperature and reaction time, to ensure that the exhaust gas is fully oxidized and burned in the equipment. High degree of automation control, easy operation and convenient maintenance.

3. Equipment application range:

Application fields: paint production and spray painting; petroleum and chemical industry (such as plastic, rubber, synthetic fiber, organic chemical industry); printing (including iron printing, printing paper, printing plastic); electronic components and wires; pesticides and dyes; medicine; picture tubes, films , Tape and other industrial organic waste gas treatment, industrial waste gas purification.

Application of exhaust gas types: hydrocarbon compounds (aromatics, alkanes, alkenes), benzenes, ketones, phenols, alcohols, ethers, alkanes and other compounds.

Applicable parameter range: large air volume (up to 100,000m3 / h or more for industrial organic waste gas treatment) and low concentration (100PPM-20,000PPM industrial organic waste gas treatment).

4. Process principle and process:

VOC is fully oxidized.

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The organic waste gas to be treated enters the ceramic medium layer of the thermal storage bed A through the induced draft fan (the ceramic medium "stores" the heat of the previous cycle), the ceramic releases heat and the temperature decreases, while the organic waste gas absorbs heat, the temperature rises, and the waste gas leaves After entering the oxidation chamber at a higher temperature, the temperature of the exhaust gas depends on the volume of the ceramic body, the flow rate of the exhaust gas, and the geometry of the ceramic body. In the oxidation chamber, the organic waste gas is supplemented by a burner and heated up to the set oxidation temperature. The organic matter is oxidized and decomposed into carbon dioxide and water. Since the exhaust gas has been preheated in the heat storage chamber, the fuel consumption of the burner is greatly reduced. The oxidation chamber has two functions: one is to ensure that the exhaust gas can reach the set oxidation temperature, and the other is to ensure that there is sufficient residence time for the VOC in the exhaust gas to be fully oxidized.

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The exhaust gas flows through the heat storage bed A and then enters the oxidation chamber for incineration. After it becomes a purified high-temperature gas, it leaves the oxidation chamber and enters the heat storage bed B (which has been cooled in the previous cycle). It releases heat, is discharged after cooling, and is stored. Hot bed B absorbs a large amount of heat and heats up (used to heat exhaust gas in the next cycle). After the treatment, the gas leaves the heat storage bed B and is discharged into the atmosphere through an exhaust fan.

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After the cycle is completed, the intake and exhaust valves are switched once, and the next cycle is entered. The exhaust gas enters from the thermal storage bed B, and the thermal storage bed A is discharged. Before switching, the cleaned gas passes through the backflushing chamber to clean the heat storage bed A to purge the organic matter remaining in the pipeline and the room. This can make the purification rate of the exhaust gas higher, which can reach more than 95%. So alternate.

On the inlet pipe of the exhaust gas source, a tee is installed, and each is installed with a pneumatic valve. When the processing equipment is stopped or a failure occurs, the straight valve is normally open. When working, the production site or central control room issues instructions to start the purification equipment, close the in-line valve, and open the air inlet valve.

The temperature detection element, fan air pressure detection and furnace pressure control are set on the processing device to ensure the normal and safe operation of the equipment.

There are two types of RTO: two-bed, three-bed, and five-bed. The three-bed RTO in the figure above is taken as an example. Organic waste gas enters the thermal storage bed A, which absorbs the heat emitted by the ceramic thermal storage body and heats up. And cool down. The organic waste gas enters the oxidation chamber at a relatively high temperature. In the oxidation chamber, the waste gas is heated by the burner to rise to the oxidation reaction temperature set by the PLC, so that the organic waste gas is oxidized and decomposed into CO2 and water. The oxidized and combusted high-temperature gas enters the cooled thermal storage bed B, transfers heat to the thermal storage body of the thermal storage chamber B through heat exchange, and is finally discharged to the atmosphere through a chimney. At the same time, the thermal storage bed C is cleaned. The valve is adjusted by the PLC, and the exhaust gas enters from the heat storage chamber B which has completely stored heat, and is discharged from the heat storage chamber C, and the heat storage chamber A is cleaned.

The three- and five-chamber RTO processing efficiency is 98%; the heat exchange efficiency is up to 95%; the purge pipeline is added, and there will be no intermittent peaks in emissions; high degree of automation and low maintenance costs.


Links: Jiangxi Jiangjing Environmental Protection Technology Co., Ltd.

Copyright © Jiangxi Longjing Environmental Engineering Co., Ltd. Record number: Gan ICP No. 15000878-1
Tel: 0791-88593088 Fax: 0791-88593098 Mobile: 18979156347 18879101596 (Mr. Fu) Email: JXLJHB@163.com Website: 333kf.cn
Address: Poly Lily, 1369 Qingshan Lake Avenue, Qingshan Lake District, Nanchang City Technical Support:

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