How do paper mills deal with exhaust gases? What is the method used for the waste gas treatment of t

The control of waste gas in the pulping process of the paper mill is mainly reflected in three aspects: first, the odor generated in the pulping production process will be sent to the alkali boiler for combustion through a complete sealed conveying system, such as NCG non-condensing gas from the pulp line, evaporation tank, causticizing and stripping tower, its composition contains H2S, CH3SH, CH3SCH3, CH3SSH3 and other sulfur-containing compounds, and also contains turpentine, methanol, water vapor, nitrogen, oxygen and other gases, which are corrosive. Toxic and explosive. Therefore, not doing the necessary ** NCG is bound to have a significant impact on air quality.

Jinhai Pulp & Paper Mill sends the NCG generated in the system to the alkali boiler for combustion, which can not only prevent it from causing serious pollution to the air, but also effectively improve sulfur. Second, the waste gas generated by pulp bleaching and preparation of chemicals is chemically treated by the exhaust gas scrubber, converted into a gas that does not pollute the air, and then discharged into the atmosphere; Third, the dust generated by the combustion of power boilers, alkali boilers and lime kilns is set up with efficient electrostatic precipitator equipment to remove the dust before the combustion tail gas is discharged. Their dust removal efficiency is more than 99%, removing most of the fly ash and dust in the flue, effectively ensuring air quality and human health.

If you are looking for exhaust gas treatment, it is recommended to find a manufacturer with rich professional experience, because this can reduce a lot of time and costs, and can give you a lot of suggestions on how to solve the exhaust gas and meet the emission standards.

At present, the state control environment is quite strict, and fines of hundreds of thousands or millions are imposed at every turn, so environmental issues are extremely important.

Personal suggestion: In this regard, it is recommended to find manufacturers in Kunshan, Xinlan Environmental Protection Company focuses on waste gas treatment and provides one-stop solutions, which can be considered.

Several methods commonly used in the treatment of exhaust gas in printing plants:

1. Activated carbon adsorption device adsorption treatment method: Advantages: international commonly used method, the effect is obvious, the principle is simple, mainly the use of activated carbon surface physical adsorption to separate VOCs from the gas and utilize, combined with scrubber or catalytic combustion device treatment effect is better; Disadvantages:

The activated carbon filter layer needs to be replaced regularly, which is a kind of physical adsorption, and has high requirements for the humidity and dust of the exhaust gas at the inlet of the equipment.

2. Catalytic combustion treatment method of catalytic combustion device: Advantages: low investment and operating costs; Disadvantages: There are potential safety hazards and explosion-proof measures are required; secondary pollution; Requires human guarding.

3. Scrubber washing method: Advantages: The initial investment is relatively low, which is suitable for the situation that the exhaust gas composition is relatively single; Disadvantages:

The treatment effect is greatly affected by the investment in operating costs, the equipment covers a large area, the operating costs are high, and a large amount of wastewater is generated, which needs to be treated twice.

4. Plant liquid method: Advantages: The initial investment is relatively low, suitable for the treatment of organic waste gas with complex composition, and suitable for the treatment of organic waste gas in almost all situations; Disadvantages: The processing effect is unstable.

5. High-energy particle treatment method: Advantages: good reputation, low investment and operation costs, no secondary pollution; Disadvantages: The humidity and dust in the exhaust gas have high requirements, and the treatment effect of the exhaust gas with high concentration and large air volume is not obvious.

6. Biological method: Advantages: the treatment effect is stable, the later operation cost is low, and the project is relatively atmospheric, which is conducive to improving the image of users; Disadvantages: large footprint, insufficient flexibility, high upfront investment costs, and greater impact by the external environment.

Printing factories and printing and dyeing factories will produce a large amount of polluting dust and gas in the production process, which has caused damage to the environment.

Lin Sen suggested that you can use spray exhaust gas purification tower equipment, for different waste gas using different chemicals, printing and dyeing factory waste gas treatment customization, can be applied to the treatment of high concentration, difficult to biodegradable pollutants, high treatment effect, printing plant waste gas treatment equipment, generally use acid and alkali neutralization and conversion into harmless salts, when it has a certain inlet speed of the dusty gas through the inlet pipe into the impact, impact the water layer and change the direction of movement of the gas, the two dust particles due to inertia continue to move in the original direction.

Most of the dust particles stay in the water after adhesion with water, after the impact water bath, there is a part of the dust particles with the gas movement, and the impact water mist and combined with the circulating spray water, in the exhaust gas purification tower to further fully mix the effect, printing and dyeing waste gas treatment installation, at this time the dust particles in the dust-containing gas will be captured by water, the dust water diameter centrifugation or filtration separation, through the tower wall into the circulation pool, purified gas discharge, wastewater in the circulation pool diameter dosing treatment after recycling, sediment regular waterlogging, transportation.

1. Treatment of combustible gas

1) The emission of combustible gas, if the emission is large, it is necessary to choose as little place as possible to prohibit fire, and have corresponding fire extinguishers, sand and water.

2) The discharge of combustible gas in the cylinder must be operated by the staff on the outlet side to prevent gas emission injury.

3) In the combustion treatment, a pressure reducing valve must be installed to control the speed of the gas, so that the gas can be discharged as slowly as possible, so that it can be completely burned in the combustion device, and the combustion method has RCO, RTO, etc.

2. Treatment of toxic gases

1) When handling toxic gases, workers must wear gas masks, gloves and other labor protection tools that are not related to the handling, and are prohibited from entering the gas treatment area.

2) Discharge of small amounts of toxic gases directly into the atmosphere, which must be discharged as far as possible with the consent of the controlled exporter and diluted to concentrations below the allowable level of the emissions.

3) Absorbents and adsorbents used in the treatment of toxic gases should only be used to ensure their effectiveness.

3. Treatment of combustible gas:

1) Powders, petroleum, petroleum and flammable substances to be attached to the valve of the container or when using the instrument shall be disassembled and the bottom shall be cleaned before gas treatment.

2) It is strictly forbidden to dispose of gases and combustible gases near the same place to prevent accidents. (3) There shall be no ignition source, no burning substances and ** substances near the gas treatment.

4. Treatment of inert gas:

1) Discharge to an appropriate place outdoors.

2) When the cylinder or machine is indoors, it can be connected to the exhaust pipe and guided to the outside to be discharged slowly.

The treatment methods of industrial waste gas include combustion method and absorption method, and the washing tower and activated carbon adsorption tower are usually used with UV photo-oxygen catalytic treatment. Kunshan Yuanhe Environmental Protection Technology Co., Ltd. is an environmental protection company integrating equipment manufacturing and engineering installation. The waste gas treatment equipment produced by the company includes acid and alkali waste gas treatment equipment, industrial dust removal equipment, industrial VOC treatment equipment and related supporting pipe valves.

General industrial waste gas treatment includes organic waste gas treatment, dust waste gas treatment, acid and alkali waste gas treatment, odor waste gas treatment and air sterilization, disinfection and purification.

At present, physical removal methods are generally used to remove particulate matter in exhaust gas, such as cyclone dust removal, wet dust removal, and electrostatic precipitator.

The purification methods for toxic and harmful gases generally include absorption method, adsorption method, catalytic reactor, and biological dust removal method. Then discharge after reaching the national standard.

The waste gas of the chemical plant is used to create material wealth for the country and reduce pollution by using the raw materials, intermediates, products and by-products lost in the production process. Therefore, the purification and improvement of chemical waste gas treatment is an important technical measure for enterprises to tap their internal potential, increase production and save, turn harm into profit, turn waste into treasure, eliminate pollution and protect the atmospheric environment. There are a variety of methods for separating hazardous substances from chemical exhaust gases.

For example, cryolite and alumina are produced from the fluorine-containing waste gas of phosphate fertilizer plant, coke oven gas is used from coke oven exhaust gas, sulfur resources are used from flue gas, and the desulfurization technology of natural gas is improved to achieve the purpose of sulfur resources.

On the other hand, for the substances with low content of some components in the exhaust gas, which do not have the best value, but will cause air pollution, it is necessary to strengthen the research on the exhaust gas purification technology. For example, in the process of fuel combustion and some production and processing, it is inevitable to emit harmful dust into the atmosphere, in this case, certain dust removal measures should be taken to deal with it. For example, in petrochemical production, carcinogenic, teratogenic and mutagenic aromatic hydrocarbon compounds are often discharged, the content of these substances is generally not very high, there is not much value, but if it is discharged arbitrarily, it will bring great harm to people's life safety and health, and effective waste gas treatment measures should be taken to ensure that it meets the emission standards.

Hello landlord, according to the questions you raised, the following will be answered in detail for you:

The toxic and harmful gases discharged in chemical production often contain a variety of pollutants, its physical and chemical properties are complex, and the toxicity is not the same, if not treated, it will seriously pollute the environment and affect human health.

Principles of chemical waste gas treatment

Gaseous pollutants such as SO2, NOX, CO, NH3, H2O, organic waste gases. The physical and chemical properties of pollutants are used to treat them by absorption, adsorption, combustion, catalytic conversion and other methods.

Particulate pollutants such as dust, soot, fog droplets, and dust mist. Taking advantage of its large mass, it is separated by the action of external force, which is usually called dust removal.

General treatment methods for chemical waste gases

The choice of waste gas treatment method for a chemical plant depends on the chemical and physical properties of the exhaust gas, its concentration, emissions, emission standards, and the economic value of its reuse as a feedstock or by-product. The general methods of chemical waste gas treatment are: absorption method, adsorption method, thermal decomposition method, incineration and catalytic combustion method.

What are the waste gas treatment methods in chemical plants?

There are three main methods for treating waste gas in chemical plants:

1. Absorption method: In the treatment of organic compounds in chemical waste gas, the chemical absorption method is mostly used.

2. Adsorption method: The adsorption method can be applied to purify the waste gas containing solvents or organic matter emitted from chemical production such as coatings, paints, plastics, rubber, etc., and activated carbon is usually used as an adsorbent.

3. Incineration method: organic pollutants or odorous substances in the waste gas of organic chemical production can be treated by direct combustion method or catalytic combustion method.

Direct combustion can be done with flares or incinerators; The flare combustion method is used to treat the exhaust gas containing enough combustibles, and the calorific value of the exhaust gas needs to be more than 1925kJ m3, and the flare is an atmospheric burner, and the combustion efficiency is low. If a forced air burner is used similar to a boiler or industrial furnace, the combustion effect is better than that of a flare. Direct combustion is usually carried out at about 1000 °C, and the products CO2, N2 and water vapor are completely burned.

Hope it helps!

Hello. The treatment of waste gas from chemical plants is still relatively strict. First of all, it is necessary to know the substances and content in the exhaust gas.

in order to be processed. To put it intuitively, it is necessary to know what products cause the exhaust gas, and to test the concentration and substance of the exhaust gas. In this way, you will know how to dispose of the waste.

Exhaust gases from chemical plants are generally not easy to deal with. It is necessary to have a qualified enterprise and a team with experience in dealing with it. Otherwise, it will be very troublesome. The device is up, and the processing result is not good. Then the rectification takes a long time. Both sides are delayed.

Hello! Now, in order to protect the environment, there are special waste gas treatment facilities!

The exhaust gases of chemical plants are specially treated.

Paper mill effluent generally contains high concentrations of organic matter, suspended solids, color, nitrogen and phosphorus, etc., and requires special treatment. Here are a few paper mill wastewater treatment methods:

Biochemical treatment: The paper mill wastewater is passed through biochemical treatment units such as aeration tanks, aerobic tanks and anaerobic tanks, and microorganisms are used to degrade organic matter and nutrients such as nitrogen and phosphorus, and relatively clean effluent is obtained. The treatment effect of this method is stable and the operating cost is low.

Flocculation and sedimentation method: By adding flocculant, the suspended solids, chromaticity and other solid impurities in the coincidental sewage are condensed into large particles, and then they are separated and removed by sedimentation tanks and other equipment. This method is suitable for the treatment of paper mill wastewater containing a large amount of suspended matter.

Membrane separation technology: Ultrafiltration, nanofiltration and other membrane separation technologies are used to separate, concentrate and remove specific dissolved substances from the wastewater of the Zhuzhi paper mill. This method has excellent treatment effect and high effluent quality, but it has high requirements for equipment and relatively high construction cost.

As far as I know, the integrated sewage treatment device with oxygen H3MBR independently developed by Evergrande Xingye Environmental Protection can meet the sewage treatment needs of paper mills. Specifically, please consult the function of the product in detail.

It is necessary to choose the corresponding treatment method according to the specific characteristics and economic conditions of the sewage, and the single or multiple methods can be used for combined treatment to achieve better treatment effect and cost saving.

Because the pollutants contained in the papermaking wastewater itself are very complex, it is a kind of industrial wastewater that is difficult to treat, and the main pollutants of the wastewater are, there are suspended flocculents, papermaking fiber fragments, COD, color, SS, etc., and it is illegal to discharge the water of the papermaking workshop without treatment. Therefore, the use of sewage treatment equipment to treat the sewage generated by paper mills is an effective measure.

Paper mill wastewater treatment method process.

1. After the wastewater enters the wastewater treatment system, the larger debris is separated through the wastewater barrier grid, enters the grid pool, and enters the coagulation tank.

2. The addition of polyaluminum chloride and polyacrylamide will produce a coagulation reaction.

3. Air flotation method to remove SS and part of BOD in wastewater.

4. The air float water can enter the anaerobic and aerobic poles for biochemistry to remove most of the BOD and COD of the water.

5. After being treated by the secondary sedimentation tank, the COD and chromaticity of the wastewater cannot meet the national discharge standards, and the discharge by chemical coagulation method meets the standards.

6. The addition of sewage decolorizer can achieve the decolorization, flocculation and sedimentation of wastewater.