What is the working principle of exhaust gas purification environmental protection equipment?

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The working principle of exhaust gas purification environmental protection equipment is to purify the harmful components in the exhaust gas such as sulfide and chloride into some neutralizing salt compounds through combustion, reaction and so on through physical and chemical methods.

First of all, the exhaust gas purification equipment needs to understand the content and composition of the reactants, which substances are included, and then we add substances that can be purified with the exhaust gas according to the composition of the reactants.

Then, the exhaust gas is effectively purified by the filler of the exhaust gas. The purified gas and filler are then separated and discharged separately.

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

The working principle of different waste gas treatment equipment is different. Under different working conditions, the composition of the exhaust gas produced is different, and the waste gas treatment equipment selected is also different. There are many types of waste gas treatment equipment, and the commonly used waste gas treatment equipment are:

Catalytic combustion equipment, photo-oxygen purifier, plasma purifier, oil fume purifier, spray tower, activated carbon adsorption box, etc.

Activated carbon adsorption box (activated carbon adsorption method).

Principle: The adsorption method is one of the effective methods to deal with low-concentration VOCs, which is to use adsorbents to adsorb VOCs in the gas, and discharge the purified gas into the atmosphere. Commonly used adsorbents include granular activated carbon, zeolite, polymer adsorption resin, activated carbon fiber, activated alumina and silica gel.

Due to the low activated carbon ** and good adsorption effect, it is the most commonly used adsorbent at present.

Scope of application: It is mainly used to adsorb NO in the waste gas by absorbing materials and adsorbents, and due to the small adsorption capacity, this method is only suitable for the waste gas treatment with low NO concentration and small gas volume.

Spray tower (water absorption method).

Principle: Using the characteristics of some substances in the odor that they are easily soluble in water, the odor components are directly in contact with the water, so as to dissolve in the water to achieve the purpose of deodorization.

Scope of application: water-soluble, odorous gas from organized emission sources.

Advantages: simple process, convenient management, low equipment operation cost, secondary pollution, need to treat the washing liquid.

Disadvantages: The purification efficiency is low, it should be used in combination with other technologies, and the treatment effect on mercaptans, fatty acids, etc. is poor.

Aeration activated sludge deodorization method

Principle: The odorous substance is dispersed into the mixture containing activated sludge in the form of aeration, and the odorous substance is degraded by the microorganisms grown in suspension The application range is wide.

Scope of application: Japan has been used for odor treatment in manure treatment plants and sewage treatment plants.

Advantages: After the activated sludge is acclimatized, the removal rate of the odorous components that do not exceed the limit load can reach more than that.

Disadvantages: Limited by the aeration intensity, the application of this method still has certain limitations.

Dilution diffusion method

Principle: The odorous gas is discharged into the atmosphere through the chimney, or diluted with odorless air to reduce the concentration of odorous substances to reduce odor.

Scope of application: It is suitable for the treatment of medium and low concentrations of odorous gases emitted by organizations.

Advantages: low cost, simple equipment.

Disadvantages: susceptible to meteorological conditions, malodorous substances still exist.

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Exhaust gas recirculation (EGR) systems are used to reduce nitrogen oxide in exhaust gases.

nox). Nitrogen and oxygen react chemically only under high temperature and high pressure conditions.

The temperature and pressure in the combustion chamber of the engine meet the above conditions, and even more so during forced acceleration.

When the engine is running under load, the EGR valve.

Open, so that a small amount of exhaust gas enters the intake manifold and enters the combustion chamber with the combustible mixture. The EGR valve closes at idle, leaving little exhaust gas recirculation to the engine. Automobile exhaust gas is a non-slippery gas gas (excluding fuel and oxygen acacifier), which does not participate in combustion in the combustion chamber.

It reduces the combustion temperature and pressure by absorbing part of the heat generated by combustion to reduce the amount of nitrogen oxide produced and sold. The amount of exhaust gases entering the combustion chamber increases as the engine speed and load increases.

The purpose of the exhaust gas recirculation is to reduce the amount of nitrogen oxides in the exhaust gas, and the exhaust gas can not be burned, so as to reduce the temperature of the cylinder and inhibit the generation of nitrogen oxidation and trapped objects.

The current exhaust gas purification technology is introduced as follows

Adsorption equipment (activated carbon.

Adsorption equipment):

The equipment is mainly used to treat organic waste gas and odorous gas, the principle of which is to use the unbalanced and unsaturated molecular gravity on the surface of activated carbon to adsorb gas molecules, when the pollutants in the waste gas are adsorbed to the solid surface, the separation and purification effect of pollutants and air is achieved.

Absorption Equipment (Chemical Solution Absorption Technology):

Diesel fuel and kerosene are used.

Acid and alkali liquid, vegetable liquid and other media, the cross-flow method is used to make the exhaust gas and the absorbent fully contact for chemical reaction.

In order to achieve the effect of absorbing and purifying the exhaust gas.

Low-temperature plasma waste gas treatment equipment:

This technology uses a large number of electrons generated by the discharge of the medium plasma under the action of the external electric field of the pollutants to bombard the pollutants, so that the pollutants can produce ionization, dissociation, excitation and other reactions, and then convert them into simple small molecule safety substances, so that the harmful substances become non-toxic, harmless or low-toxicity substances, so as to achieve the effect of purifying the exhaust gas.

Photocatalytic oxidation waste gas treatment equipment:

High-intensity ultraviolet rays produced by photooxidation and microwave light.

Direct irradiation of pollutant molecules will cause the pollutant molecules to be broken and the molecular chain will be cracked and the structure will be changed, and the polymer pollutants will be decomposed into harmless carbon dioxide.

or water, in order to complete the purpose of exhaust gas purification.

Biological deodorization waste gas treatment equipment:

Biological deodorization waste gas treatment technology is to use microorganisms to absorb waste gas substances through metabolism, and use pollutant substances as nutrients for microorganisms, so as to continuously convert harmful substances into carbon dioxide, water and cytoplasm in Wuhai during metabolic activities.

Wait. Molecular sieve.

Rotor regenerative incineration waste gas treatment process:

The secondary technology is very similar to catalytic combustion, except that a runner molecular sieve is added to the original catalytic combustion, and its regenerative oxidation furnace can use the catalyst for combustion more effectively.

What are the components of the exhaust gas purification treatment system? Let's take a look today. Other Notes:

The exhaust gas purification treatment system is composed of a gas collection hood, exhaust gas treatment equipment, a fan, an air duct and a chimney. The commonly used waste gas treatment principle is to remove or reduce the harmful gas emissions of acid and alkali waste gas, organic waste gas and odorous gas, so as to protect environmental protection and purify the air.

The respective functions of the parts that make up the exhaust gas purification treatment system are:

1. Gas collection hood.

The gas hood, as the name suggests, is used to collect gases, and it is an indispensable prelude to the exhaust gas treatment system. Its performance has a direct impact on the efficiency of the exhaust gas treatment system. Due to the different structures of pollution source equipment and production and operation processes, the forms of gas collection hoods are diverse.

2. Waste gas treatment equipment.

Waste gas treatment equipment has been developed rapidly in recent years, especially under the pressure of environmental protection. Common equipment spray tower, plasma deodorization, UV photo-oxygen integration, biological deodorization, silane combustion tower, RTO RCO catalytic combustion, etc. For different industries, different exhaust gases have different processes.

3. a fan. The fan provides the power of gas flow in the exhaust gas treatment system, which is generally equipped at the air inlet as needed, and the air outlet is equipped with a fan to introduce the treated gas into the chimney through the fan for discharge.

4. an air duct. The pipes used to transport the air flow in the exhaust gas treatment system are called air ducts, through which the equipment and components of the system are connected as a whole.

5. a chimney. The chimney is the exhaust device of the exhaust gas treatment system. Because the purified flue gas still contains a certain amount of pollutants. These pollutants diffuse in the atmosphere, dilute, and eventually settle to the ground.

Expand knowledge: what are the common faults and troubleshooting methods of exhaust gas treatment system

1. The power supply is abnormal

Contact the power supply department to see if the RTO system has been supplied; Check the relevant power switches and circuits; Pay attention to whether the air switch and fuse are blown.

2. Fan failure

1) Whether the communication between the PLC and the display screen is normal, such as whether the communication line is loose and falls off.

2) If the fan is automatically stopped, the power cabinet can be powered off and then restarted.

3) If the fan motor fails, it may cause the motor to overcurrent, which will give an alarm.

3. Low wind pressure of the fan alarm

1) Check whether the motor is running and whether there is any abnormal noise; No broken or loose belts; Whether the bearings, circuits, and motors are powered on normally.

2) Observe the rotation of the fan, if there is no abnormality in the rotation, replace the differential pressure switch.

3) If it still cannot return to normal after restarting, it needs to be checked and repaired by technicians.

4. Low compressed air pressure

1) Confirm whether the manual valve on the main compressed air pipeline is open.

2) Confirm whether the gas supply system is decent and slippery, and observe whether the pressure gauge indicates whether the pressure is there. If so, check whether the pressure switch parameter setting is correct (or damaged; If not, contact to check whether the air compressor and dryer are working properly.

3) Check that there is no leakage in the compressed air pipeline, and if it is normal, check whether there is leakage in the compressed air pipeline.

There are many kinds of waste treatment, mainly dust removal and denitrification.

The equipment and principles of dust removal mainly include the following categories: biological nanofilm, cloud dust suppression, wet dust collection, gravity dust removal, inertial dust removal, cyclone separator dust removal, bag dust removal, electrostatic precipitator removal, etc.

The current method of denitrification is mainly SCR denitrification, which refers to the decomposition of urea solution in the mixed area of the exhaust pipeline when it encounters high temperature flue gas to generate NH3 as the reducing agent, and uses its high selective reducibility to NOx to generate harmless nitrogen (N2) and water (H2O) in the catalytic reaction zone, and the reaction mechanism is as follows. The reaction principle is as follows:

Urea is pyrolyzed and hydrolyzed to produce ammonia gas, which provides raw materials for the reaction.

Urea specific reactions:

Urea pyrolysis reaction: CO(NH2)2 NH3+HNCO(1)Urea hydrolysis reaction: HNCO+2H2O NH3+CO2(2) denitrification principle reaction:

Standard SCR reaction: 4NH3 + 4NO+O2 4NH2+6H2O(3) Fast SCR reaction: 4NH3+2NO2+O2 3N2+6H2O(4) Slow SCR reaction:

8nh3+6no2 → 7n2+12h2o（5）

This is provided by Hebei Zhengyin Steel Structure, and we are happy to answer for you. The types of waste gas treatment equipment selected are different according to different treatment conditions. Commonly used waste gas treatment equipment includes photo-oxygen purifiers, plasma purifiers, activated carbon adsorption boxes, catalytic combustion equipment, welding fume purifiers, oil fume purifiers, etc.

How the photo-oxygen purifier works:

After the odorous gas is input to the photo-oxygen purifier by the exhaust equipment, the equipment uses the UV ultraviolet beam to decompose the oxygen molecules in the air to produce free oxygen, which needs to be combined with the oxygen molecules due to the imbalance of the positrons and negatives carried by the free oxygen, and then produce ozone. The reaction formula is as follows:

UV O2 O-+O (free oxygen) O+O2 O3 (ozone);

The special high-energy and high-ozone performs a synergistic decomposition and oxidation reaction on the odorous gas, so that the odorous gas substances are degraded and converted into low-molecular compounds, water and carbon dioxide, and then discharged outside through the exhaust pipe, so as to achieve the purpose of deodorization and killing.

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

Exhaust gas treatment towers

The main function of spray tower, water washing waste gas tower, washing tower and acid mist treatment tower is to reduce the concentration of waste gas through washing, and let the waste gas enter the packing layer through the dosing system, which plays a neutralizing role in acid and alkali waste gas, and is a common equipment for reducing the concentration of waste gas pretreatment. The cyclone tower is a kind of exhaust gas tower, which can make the desulfurization and deacidification more fully by using the role of cyclone, and play the role of desulfurization and deacidification.

Activated carbon adsorption equipment

Enterprises commonly used have activated carbon adsorption box, through the pre-treatment of the waste gas tower, into the activated carbon adsorption box, activated carbon has a good adsorption effect on VOCs waste gas molecular particles, can play a role in purifying the exhaust gas.

Plasma waste gas treatment equipment

The main principle is to release ozone by generating a strong electromagnetic field, so as to decompose odorous gases and achieve good effects of deodorization and oil smoke.

Biological deodorization towers

Also known as biological trickling filter tower, it is a process of absorbing odorous gases, such as sulfide gas, ammonia and other waste gases, and releasing carbon dioxide and water through the cultivation of biological bacteria.

Pulse dust removal equipment

Divided into dry dust removal and wet dust removal, the dry dust collector is mainly for dry dust, using the principle of electromagnetic field, so that the dust is rotated and thrown out under the action of gravity, and then into ash at the bottom of the equipment tower, and then cleaned by mechanical vibration. Wet dust removal equipment, also known as wet electric dust removal, is mainly aimed at wet dust, fine particles, and some odorous bubble dust to clean, and uses spray cleaning to make the dust treatment cleaner and no secondary pollution.

Catalytic combustion equipment

Also known as RCO, the equipment has adsorption and desorption, heat storage, purging, release of heat energy, repeated operation, through the role of catalyst, the general temperature is between 300 -500, so that the exhaust gas is flameless combustion at low temperature, so that the exhaust gas treatment is more complete.

Hope it helps!