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Waste gas treatment

For chemical enterprises all kinds of waste gas from the source would be optimized to reduce the emissions, the waste gas compositions would be analyzed, then uses the technology such as separation, solvent absorption, adsorption stripping and chemical reaction to recycle the resource, and then use the selectively choosing desulfurization denitration technology, catalytic incineration, regenerative thermal incineration(RTO), photo catalytic oxidation, light resonant decomposition, decomposition of plasma treatment technology to meet the discharging standard.

 
 

Waste gas treatment technology

  • Catalytic oxidation washing technology
  • Adsorption and desorption technology - temperature adsorption
  • Introduction of nitrogen oxide resource technology
  • VOCs Incineration Technology - Direct Incineration
  • VOCs Incineration Technology - Regenerative Thermal Incineration
  • VOCs incineration technology - direct catalytic incineration
  • VOCs Incineration Technology - Regenerative Catalytic Incineration
  • Low Temperature Plasma Exhaust Gas Treatment Technology
  • Photocatalytic Oxidation Technology
  • Low light resonance technology

Technical introduction: Catalytic oxidation washing technology is a new and efficient catalytic oxidation of waste gas technology, it is the use of strong oxidizing agents sodium hypochlorite, hydrogen peroxide, potassium permanganate, persulfate, chlorine dioxide and other oxidants in the presence of heterogeneous catalyst conditions, Oxidative degradation of pollutants in the exhaust gas, the mechanism is divided into two coexistence, 1, direct oxidation of pollutants in the exhaust gas as the final product or oxidation of intermediate products; 2, the pollutants in the exhaust
First transferred to the liquid phase, and then the waste liquid for deep catalytic oxidation.
In the catalytic oxidation washing technology is the use of heterogeneous catalyst, the catalyst to join the speed up the reaction, which is: First, reduce the activation energy of the reaction; Second, change the reaction process. The process of catalytic oxidation can be considered as: the pollutants and oxidant molecules in the exhaust gas diffuse into the liquid phase, and then the pollutants in the liquid phase are adsorbed on the catalyst surface, and then the pollutants and oxidant molecules on the catalyst surface catalytic oxidation reaction occurs, The reaction product is desorbed and returned to the liquid phase.
Catalytic oxidation and washing technology in the exhaust gas treatment is the use of oxidative absorption of liquid oxidation of the gas phase of the pollutants in the oxidation of washing down, and then catalytic degradation, organic matter can eventually be degraded to carbon dioxide and water, inorganic degradation of inorganic ions. Catalytic oxidation washing technology in the pharmaceutical, dyes, chemical, coal-fired power plants, waste power plants and other industries have achieved good results in the exhaust gas treatment.

Basic process:

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Process Description: Exhaust gas catalytic oxidation washing technology, the exhaust gas from the absorption tower into the exhaust pipe, after the gas into the filler into the absorption tower, the absorption of liquid through the circulation pump into the top of the tower, the absorption of gas, the waste into the catalytic oxidation bed Layer, the depth of the removal of pollutants.

Technical characteristics: 1, adaptability, for most of the exhaust has a good removal rate and degradation rate.
2, the operating costs are moderate. In the presence of the catalyst, the amount of waste liquid is greatly reduced, thereby greatly reducing the cost of water.
3, easy to operate control, exhaust gas absorption oxidation reaction speed, the reaction is complete, because it is a physical – chemical process, it is easy to control.
4, low temperature and pressure can be carried out in the exhaust gas degradation, mild conditions, than the plasma, photolysis and other conventional technical safety.

Technical Description: Variable temperature adsorption (TSA) is based on the separation of components to be separated at different temperatures in the adsorption capacity difference to achieve separation, due to the use of temperature fluctuations in the cycle of operation, low temperature adsorption of strong adsorption components at high temperatures to get off Attached, adsorbent can be recycled, cooled and recycled. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: This process is a double column adsorption. VOCs exhaust gas after dust and cooling into the adsorption tower A, after adsorption exhaust gas discharge standards, A tower adsorption saturation to switch to B tower adsorption, and A tower into the regeneration process (divided into thermal desorption and hot air drying process), so the cycle Reciprocating, working in turns. After desorption, the organic gas is condensed at 1 to 2 levels, enters the separation tank in the form of a mixed solution, or directly enters the incineration unit. The purified gas is discharged into the atmosphere by the draft fan.

Technical characteristics: 1, complete regeneration, high recovery rate, product loss rate is low;
2, suitable for a single component, air volume 10000 ~ 150000m3 / h, the concentration of 1000 ~ 66250mg / m3 of waste gas for processing;
3, the combination of compact devices, a high degree of automation, easy to operate;
4, for chemical, pharmaceutical, printing and dyeing industries VOCs gas resources, including high boiling point organic matter purification and so on.

Technical brief introduction: sulfuric acid oxidation NOX direct absorption technology is to waste NOX in the realization of resource, harmless treatment, according to the needs of users can be used for the production of disperse diazo reagent – nitrosyl sulfuric acid or nitroxyl chloride , To replace sodium nitrite, thereby reducing costs and improve product quality.
The technology not only governs the NOX pollution problem, but also reclaims the nitrogen resources and produces the great economic value, conforms to the clean production and the circular economy development request, the environmental protection benefit and the considerable economic benefit both.

Process flow:

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Process Description: sulfuric acid oxidation NOX direct absorption method, the chemical production process directly through the NOX into the concentrated sulfuric acid medium, the occurrence of oxidation – reduction reaction, the formation of nitrosyl sulfuric acid.
SO2 + 2NO2 + H2SO4 → 2NOHSO4
NO + NO2 + 2H2SO4 → 2NOHSO4 + H2O
(2) reaction; if the exhaust gas composition to NO can be the main access to the oxidation chamber, through the air (air), the amount of NO in the exhaust gas composition, To adjust the NO and NO2 ratio, to achieve the use of resources. In addition, the process also to achieve the simultaneous treatment of sulfur dioxide.

Technical characteristics: 1, innovative technology, the typical wet denitrification, with complete independent intellectual property rights.
2, nitrogen oxide removal efficiency of up to 95% -98%; one-time resource NOX, no secondary pollution.
3, as the production of disperse diazo reagent, the higher the content of NOX in the exhaust gas, the more obvious the economic benefits.
4, low operating costs, the main energy consumption: the recycling of absorbent.
5, the equipment is simple, small footprint, flexible operation, open parking convenience, inspection and maintenance costs low.

Technical brief introduction: direct burning and purifying device (PAI) will be combustible components in the exhaust gas as fuel, exhaust through the filter and flame arrester, through the heat exchanger heated to about 500oC, and then into the incinerator, the reaction after the formation of CO2 and H2O. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: In operation, the draft fan entrained with contaminant-laden airflow into the incineration chamber, and the incinerator inlet is equipped with a spoiler for the complete mixing of the exhaust and oxygen molecules. The exhaust gas is passed through a filter and a flame arrester, heated to about 500oC through a heat exchanger, and then enters the incinerator, and generates CO2 and H2O after the reaction. Incineration process exotherm, after the reaction of high temperature gas heat exchanger heat exchanger for the preheating of imported gas, high temperature gas after heat exchange, the fan into the atmosphere.

Technical features: 1, only applies to deal with high concentrations of organic gases or higher heat value of organic gases;
2, air volume ≤ 3000 m3, concentration ≥ 5000 ppm VOCs, the processing efficiency of up to 98% or more;
3, and make full use of the reaction heat generated by combustion, heat transfer efficiency of 65%, saving energy.

Technical brief: Thermal incineration generally refers to the use of regenerative thermal incinerator (RTO), the organic waste gas heated to 760oC or more, so that the exhaust gas VOCs decomposed into harmless CO2 and H2O. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: Thermal incineration generally refers to the regenerative thermal incineration (RTO), the main structure of the device has a regenerator, combustion chamber, ceramic filler bed and switching valve. The principle is to heat the organic waste to 760oC or more, so that the exhaust gas VOCs oxidized into harmless CO2 and H2O. The high temperature gas produced by the oxidation is subjected to a “heat storage” through a specially designed regenerator, which is used to preheat the subsequent exhaust gas. Each RTO has more than two regenerators, each regenerative chamber in turn heat storage – exotherm – purge program, cycle, continuous operation.

Technical characteristics: 1, for the air volume of thousands to tens of thousands of m3 / h, VOCs volume fraction of 0.01% -0.20% of the situation;
2, VOCs removal rate ≥ 95%, up to 99%; thermal efficiency ≥ 90%, fully energy conservation;
3, easy to operate, a high degree of automation, a key to start;
4, safe and reliable operation, long life, easy maintenance.

Technical Description: The exhaust gas is heated to a catalytic ignition temperature (typically> 220 ° C) by direct catalytic incineration (PAC) equipment. And then into the catalytic reaction bed, under the action of the catalyst, the oxidation reaction to produce harmless CO2 and H2O. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: After passing through the filter (fire), the exhaust gas is heated by the heat exchanger and the electric heater to heat the exhaust gas to the catalytic ignition temperature (typically> 220oC). And then into the catalytic reaction bed, under the action of the catalyst, the oxidation reaction to produce harmless CO2 and H2O. As the reaction exotherm, so that after the reaction gas temperature rise to a certain temperature. After the reaction of high temperature gas heat exchanger heat exchanger, so that the inlet gas preheating, while high temperature gas to reduce the temperature, and finally by the induced draft fan into the atmosphere.

Technical characteristics: 1, by adding a catalyst to reduce the temperature required for oxidation reaction, thereby reducing energy consumption;
2, for low concentrations, small air volume of organic waste gas; VOCs removal rate ≥ 98%;
3, efficient heat exchanger, thermal efficiency of 65% or more;
4, electric heating, flameless burning;
5, the reaction temperature is low, equipment, low cost, long life, less heat loss.

Technical Description: The exhaust gas is heated to the catalytic ignition temperature by regenerative catalytic incineration (PAC) equipment. Under the action of the catalyst, the oxidation reaction produces harmless CO2 and H2O, which combines the regenerative incineration and catalytic incineration Advantages in one. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: The exhaust gas is initially heated to the catalytic ignition temperature through the heat exchanger, and then into the catalytic reaction bed, under the action of the catalyst, the oxidation reaction to produce harmless CO2 and H2O, the subsequent need for external heating or the need for very little Heat. As the oxidation reaction exotherm, the temperature of the reaction increases to a certain temperature. The high temperature gas produced by the oxidation is subjected to “heat storage” through a specially designed regenerator, which is used to preheat the subsequent exhaust gas. The exhaust gas is completely decomposed through the catalyst bed. Each RTO has more than two regenerators, each regenerative rotation of the heat storage – heat – purge procedures, cycle, continuous operation.

Technical features: 1, set regenerative burning and catalytic incineration in one;
2, suitable for low concentration, large amount of air emissions;
3, energy saving and environmental protection, thermal efficiency ≥ 90%;
4, purification efficiency, VOC removal rate ≥ 95%, up to 98%;
5, the air volume is small, can be used electric heating, to achieve flameless combustion;
6, in a certain concentration range, to adapt to fluctuations in the concentration of exhaust gas.

Technical Description: Low-temperature plasma technology is generated by the acceleration of the electric field to produce high-energy electrons. When the electron average energy exceeds the bond energy of the molecular key of the target compound, the molecular bond breaks and the catalyst can promote the decomposition of the pollutant molecules, The purpose of gaseous pollutants. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: The exhaust gas enters the plasma reaction device through the draft fan. The plasma generation mode is the dielectric barrier discharge (DBD). The plasma produced by this method has the characteristics of high energy and fast reaction, so that the pollutant gas decomposes in a short time. (TiO2, MnO2, etc.), improve the reactivity, so that VOCs, malodorous gases or other pollutants completely converted to CO2, H2O, N2 and other small molecules, purified gas filter to remove ozone, Into the atmosphere.

Technical features: 1, fast response, not subject to gas speed limit;
2, the electrode is not directly in contact with the exhaust, there is no corrosion equipment problems;
3, mainly used for stench, or air flow in the 1000 ~ 60000m3 / h, organic matter concentration of less than 500mg / m3 of waste gas treatment;
4, suitable for chemical, pharmaceutical, printing and dyeing industries such as low concentrations of VOCs gas purification, methyl mercaptan, methyl sulfide, CS2, ammonia and other odorous gas purification, nitrogen and oxygen removal.

Technical Description: Photocatalytic oxidation technology that under light irradiation, the catalyst absorbs light energy equal to the following bandgap energy, so that the surface of the incentive to produce electrons (e-) and holes (h +), these electrons and holes have Very strong reduction and oxidation ability, with water or stored oxygen reaction, the rapid generation of strong oxidizing ability of hydroxyl radical (-OH) and super oxygen ions (O2-). -OH has a high oxidation potential, is an oxidation group, can oxidize most of the organic pollutants in the electrons, so that the original does not absorb light material directly oxidative decomposition. Most volatile organic compounds can be sufficiently degraded in 2-3 seconds under the combined action of ultraviolet light and catalyst, and the photocatalytic oxidation technology has high removal efficiency for volatile organic pollutants. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: Exhaust gas before the first pretreatment, remove the acid gas and then into the purification equipment; exhaust gas into the photocatalytic oxidation equipment, the exhaust gas compounds are cracked and oxidized into small molecules, such as CO2, H2O and so on. Due to the presence of nano-scale active catalyst, under the action of ultraviolet light, resulting in a more intense catalytic degradation function, and ultimately the exhaust gas molecules completely decomposed, the standard after the fan discharged into the air.

Technical characteristics: 1, photocatalytic oxidation technology deodorization efficiency: high efficiency to remove hydrogen sulfide, ammonia, thiols, volatile organic compounds (VOC), inorganic and other malodorous gases, deodorization efficiency up to 99% ;
2, a wide range of applications: widely used in pharmaceutical, pesticide, rubber, petrochemical, sewage plants and other needs deodorant places;
3, the technology can adapt to high, low concentration, atmospheric, different odor gas deodorant cleaning treatment, 24 hours a day can work continuously, stable and reliable, and low operating costs, without special management and routine maintenance, only for regular an examination.
4, external light catalytic oxidation equipment, low energy consumption, equipment, low wind resistance, can save exhaust power consumption.
5, photocatalytic oxidation technology Scope:
Such as hydrogen sulfide, ammonia, thiols, styrenes and other stench produced by kraft pulp, oil refining, coking, petrochemical, gas, manure, pharmaceutical, pesticide, synthetic resin, rubber, waste disposal, sewage treatment, leather processing, gas. The technology to deal with chemical waste gas, methyl mercaptan gas, paint room gas treatment, toluene gas tail gas treatment, raw material pharmaceutical tail gas treatment, furniture factory paint exhaust have a better effect.

Technical brief introduction: the microwave on the organic waste gas or inorganic waste gas for rapid cracking split, and then use high-energy high ozone UV light beam decomposition of oxygen molecules in the air to produce free oxygen, that is, reactive oxygen, due to free oxygen carrying positive and negative electronic imbalance so Combined with oxygen molecules, and then produce ozone. And finally through the ozone generator to produce enough oxygen ions to oxidize the exhaust gas, so that the exhaust gas to produce carbon dioxide and water effect.
Organic exhaust gas → microwave + light solution + O2 → O- + O2- (reactive oxygen) + O2 → O3 → CO2 + H2O
Change the molecular structure of malodorous gas molecules, so that organic or inorganic macromolecule odor compounds molecular chain, in the light microwave damage process, into low molecular weight compounds, such as C02, H20 and so on. For the convenience of understanding, with technical principles introduced.

Basic process:

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Process flow:

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Process Description: Odor gas (industrial waste gas) using the exhaust equipment input to the purification equipment, the purification equipment using high-energy UV ultraviolet light and ozone on the decomposition of malodorous gas decomposition reaction, the degradation of malodorous gas substances into low molecular weight compounds, Water and carbon dioxide, and then through the exhaust pipe out of the room

Technical characteristics: 1, microwave photolysis technology can be efficient in addition to odor, can efficiently remove volatile organic compounds (VOC), inorganic, hydrogen sulfide, ammonia, mercaptans and other major pollutants, as well as a variety of malodorous, Deodorization efficiency of up to 99% or more, especially suitable for purification of high concentrations of atmospheric emissions;
2, without adding any material, only need to set the corresponding exhaust pipe and exhaust power, so that odor / industrial waste deodorization decomposition purification.
3, the equipment operating costs are low, microwave photolysis equipment without any mechanical action, no noise, no need to manage and routine maintenance, only for regular inspection, equipment, low energy consumption, can save a lot of exhaust power consumption;
4, equipment covers an area of small, suitable for compact layout, the venue is very small and other special conditions.
5, microwave photolysis technology for: acetone, butanone, ethyl acetate, VOC, formaldehyde, acetaldehyde, ethyl acetate, benzene, benzene, toluene, xylene, styrene, alkanes, Aromatic hydrocarbons, phenols, hydrogen sulfide, mercaptans, thioethers, ammonia, amines, indoles, nitro and other odor and exhaust.
6, the scope of application: paint factory deodorant, rubber factory deodorant, plastic factory, paint factory deodorant, spray shop deodorant, furniture factory deodorant, tanneries deodorant, tobacco deodorant, chemical deodorization, paper mill Smelly, deodorant, deodorant, deodorant, deodorant, sewage treatment plant deodorant, VOC organic waste gas treatment deodorant, fecal treatment, synthetic fiber, synthetic resin, industrial wastewater, domestic sewage treatment and other industries Treatment, odor treatment, tail gas treatment, odor purification, air purification, disinfection and so on.

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