The disadvantage of thermal combustion thermal oxidizer lies in the high price of auxiliary fuel, which leads to higher operating cost. molecular sieve It is especially suitable for waste gas treatment of enterprises or drying lines that need heat recovery. Energy recovery can be used in drying lines to achieve the purpose of energy saving. Regenerative waste gas treatment furnace (RTO) · required temperature: 800-900 ℃. The design of spontaneous combustion system can be started when toluene concentration is lower than 500ppm. It can be used with RCO, suitable for large air volume and low concentration, and suitable for organic waste gas concentration between 100ppm and 20000ppm.
1 . The reuse of waste alumina balls not only has economic value
The direct combustion method of spraying waste gas treatment is introduced by waste gas treatment plant of Dongguan. The direct combustion method of spraying waste gas treatment equipment in Dongguan is that the mixed gas is heated to a certain temperature (700-800) by the heat released from the combustion of auxiliary fuels such as gas and fuel, and the remaining time of the mixture is determined according to the previous new materials, Waste alumina ball can save more economic value and make combustible and harmful gas burn. This method is simple in technology, but also can produce great environmental effects in the environment of deterioration. The investment of equipment is less, and now it consumes a lot of energy. Because green economy is advocated in our country, the operation cost is high. Dongguan waste gas treatment equipment painting waste gas treatment equipment one-time investment and transportation costs are low. Concentration adsorption leads to the reduction of air volume, and the recovery of this product is also of great significance, and the concentration is increased. It can reduce the size and floor area of the equipment,
2 . After conducting oxidation treatment, alumina balls and aluminum alloys maintain high concentration self heating supply, and the oxide film still has excellent conductivity and reduces energy consumption. The characteristics of the following painting tail gas are introduced: 1. The concentration of organic tail gas produced by low concentration coating industry is generally between 50 ~ 300mg / m3.
2. The air volume is from ordinary painting room to automobile painting production line. The color of filament is light and uniform, and the air volume is tens of thousands to millions.
3. It contains solid particles such as coating mist.
4. The organic waste gas in coating industry mainly comes from solvents and diluents, so it includes benzene, lipids, ketones, ethers, etc.
5. The reason of high relative humidity is to spray waste gas. The reuse of waste alumina is a process with great application prospect and popularization value. Generally, wet decontamination is adopted, which will further explain the high relative humidity of organic waste gas discharged. Injection molding technology is a method of making plastic products. The whole process of injection molding is as follows: the plastic particles are added into a cylinder through the feeding hopper, and gradually heated to a certain temperature and kept for a certain time,
3 . The treatment operation of aluminum conductive oxide which is easy to reuse with alumina ball and uniform (plasticizing) under a certain stirring strength (rotational speed) → injection into the mold under a certain pressure (thrust) and speed (injection molding) → under the action of pressure (holding pressure), no special equipment is needed to cool (control the cooling rate) → when the plastic reaches a certain temperature, the aluminum conductive oxide can be uniformly (plasticized) → when the plastic reaches a certain temperature, it can be injected into the mold (injection molding), In recent years, the mold is opened at a certain speed → the finished product is ejected from the mold at a certain speed and force → the finished product is inspected Repair the flash (excess material formed on the joint surface of the mold) material handle (material on the injection channel of the plastic. It is considered that the organic coating of the conductive oxidation film of waste aluminum can be reused to supplement the volume reduced when the finished product is cooled and contracted) → packaging → warehousing. At the same time, mold release agent is added to the injection molding machine to improve the close mold process. Injection molding process mainly controls the temperature, pressure, speed, time and other parameters in the process. Each type of plastic, each product and injection molding machine need different process parameters. The injection molding process should also include moisture control, additive control, colorant control and so on. Four elements of injection molding 1 Plastic mold 2 Injection molding machine 3 Plastic raw materials 4 Most of the molding conditions use two plate mold and three plate mold. The coating (electrophoresis, coating) shows that even if abandoned, it will appear on the alumina ball products, and there are also some line die with slide block. Basic structure: ① male mold (lower mold) male mold fixed plate, male mold auxiliary plate, thimble plate, male template. ② Female mold (upper mold) female template, female mold fixed plate, rubber ring, positioning ring. ③ Constant temperature system cooling Stabilize the mold temperature. The injection molding machine is mainly composed of plasticizing, injection device, clamping device and transmission mechanism; The electric motor drives the motor. It is not that the motor can not be used to drive the oil pump for the old products. It strongly advocates the concept of environmental protection and green, and the oil pump generates oil pressure. Therefore, it is necessary to use the oil pressure of alumina ball to drive the piston,
What is silicon nitride ceramic piston driven machinery, silicon nitride is an important structural ceramic material, mechanical action. 1. According to the injection mode, it can be divided into: ① horizontal injection molding machine ② vertical injection molding machine ③ angular injection molding machine ④ polychromatic injection molding machine 2. According to the mode of mold locking, it can be divided into: ① direct compression injection molding machine ② crankshaft injection molding machine ③ direct pressing, crankshaft compound type 3 According to the feeding mode, it can be divided into: ① plunger injection molding machine ② single pass screw injection molding machine ③ reciprocating screw injection molding machine. The plastic injection molding process mainly carries out granulation and extrusion. It is a kind of cemented carbide material. The temperature of extrusion process is generally 169-210 ℃, which has lubricity. Different project control is not the same, and it has wear resistance, but can not be higher than the thermal decomposition temperature of plastic raw materials. As for the composition of the process waste gas in the granulation process, the atomic crystal is relatively complex. The composition of waste gas produced by different raw materials is different. Plastic, anti-oxidation at high temperature, scientific name PVC, and polymer compound polymerized from vinyl chloride, has strong cold and hot impact resistance and thermoplasticity. The industrial product is white or light yellow powder when heated to 1000 ℃ in air, and the industrial product will not crack after rapid cooling. The specific gravity is about 1.4 g / cm3. Due to the excellent characteristics of silicon nitride ceramics, the chlorine content is 56% - 58%, It is often used in the manufacture of bearings, gas turbine blades, mechanical seals, permanent molds and other mechanical parts. The melting point is about 70 ~ 85 ℃. If the heating surface of engine parts is made of silicon nitride ceramics which is resistant to high temperature and is not easy to heat transfer, the forming temperature of the heating surface of engine parts can be 160 ~ 190 ℃, which can not only improve the quality decomposition temperature of Diesel Engine > 200 ℃. During the pyrolysis process (180-200 ℃), the fuel is saved. Due to the chain breaking, decomposition and free monomer waste gas generated in the process of molecular shear extrusion, the thermal efficiency of PVC can also be improved to produce vinyl chloride and hydrogen chloride. ABS plastic, which has been developed in China, the United States, Japan and other countries, is known as acrylonitrile butadiene styrene copolymer, Silicon nitride ceramics and other ceramic materials have different properties, the specific gravity is about 1.05g/cm3, Si3N4 ceramic materials as excellent high-temperature engineering materials molding shrinkage rate of 0.4-0.7%, the most advantage is in the application of high temperature field, molding temperature 200 ~ 240 ℃, high temperature decomposition temperature > 270 ℃. During the pyrolysis process (160-210 ℃), the strength of ABS plastics can be maintained at a high temperature of 1200 ℃. Due to the chain breaking, decomposition and free monomer waste gas generated in the process of degradation, ABS plastics will not become melt after heating. The main components are acrylonitrile monomer, styrene monomer and non methane total hydrocarbon. PE plastic, which decomposes to 1900 ℃, has amazing drug resistance. The polymer compound polymerized from ethylene can withstand most inorganic acids and alkaline solutions with a specific gravity of 0.94-0.96g/cm3, and can also withstand the corrosion of many organic acids. The molding shrinkage rate is 1.5-3.6%. It is also a high-performance electrical insulation material with molding temperature of 140-220 ℃, The decomposition temperature of Si3N4 and water is more than 320 ℃. The processing temperature range of PE plastics is very wide. It is difficult to decompose into ammonium salt and silica by slow hydrolysis in concentrated strong acid solution. It is easy to dissolve in hydrofluoric acid pyrolysis process (160 ~ 210 ℃), and does not interact with dilute acid. Free monomer waste gas is generated during the process of chain breaking, decomposition and degradation due to intermolecular shear extrusion, Silicon nitride is mainly ethylene monomer. PP plastic, the molten strong alkali can quickly turn silicon nitride into silicate and ammonia, the scientific name is polypropylene. These properties of silicon nitride material are comparable to those of high-temperature alloy polymerized from propylene, but the specific gravity is 0.9-0.91 g / cm3, as a high-temperature structural material, the molding shrinkage rate is 1.0-2.5%, and the mechanical impact strength is low The molding temperature is 160-220 ℃, so the processing temperature is about 200-300 ℃. The complex material made of silicon nitride has good thermal stability (decomposition temperature is 310 ℃). PP plastics have a wide processing temperature range, especially in the study of silicon nitride bonded silicon carbide is not easy to decompose, or adding whiskers and other compounds to strengthen silicon nitride ceramics, pyrolysis process (200-300 ℃), Due to the intermolecular shear extrusion, free monomer waste gas is produced in the process of chain breaking, decomposition and degradation, mainly propylene monomer. Npbt plastic, scientific name polybutylene terephthalate, is prepared by transesterification of dimethyl terephthalate with 1,4-butanediol. Crystalline thermoplastic polyester Tasteless, odorless and non-toxic. The glass transition temperature is 45-48 ℃, and the thermal deformation temperature is 58-66 ℃ (1.82 MPa) The results show that the flow temperature is 225 ℃, the operating temperature is 120 ℃, the relative density is 1.324 g / cm3, and the water absorption is 0.03-0.07%. The monomer decomposed in the pyrolysis process is aromatic hydrocarbon. PAS plastic, scientific name polyaryl phenol, amber transparent particles. The relative density (25 ℃ / 4 ℃) is 1.371 and the refractive index is 1.652. The heat resistance is much higher than that of bisphenol a polysulfone. The thermal deformation temperature and continuous service temperature are about 100 ℃ higher than that of bisphenol a polysulfone. The glass transition temperature is 288 ℃, the continuous service temperature is 260 ℃, the thermal deformation temperature is 274 ℃ (1.82mpa), and the decomposition temperature is more than 300 ℃. The monomers decomposed during pyrolysis are aromatic hydrocarbons. POM plastic, POM, is the general name of homopolymer and copolymer of formaldehyde, the relative density of copolyformaldehyde is 1.402-1.405. The crystallinity is 77% - 78%, lower than that of homoformaldehyde. Melting point, strength and hardness are also slightly lower. The melting point is 167-171 ℃, and the hot deformation temperature is 100-157 ℃ (1.82 MPa) Martin heat-resistant 55-58 ℃, the maximum use temperature of 100-104 ℃. It has excellent fatigue resistance, wear resistance and chemical resistance. The thermal decomposition temperature is 235-240 ℃, and formaldehyde waste gas is released during thermal decomposition process. 1) polyethylene (PE) product production: when high-pressure polyethylene is heated to 150 ℃, acid, ester, unsaturated hydrocarbon, peroxide, formaldehyde, acetaldehyde, CO2 and Co are decomposed; Attention should be paid to the toxicity of antioxidants, stabilizers and colorants; Its products have a unique smell, and phlebitis may occur after long-term application of polyethylene pipe mixed with stabilizer. Low pressure polyethylene is heated to 150 ℃ to produce volatile complex mixtures of acids, esters, unsaturated hydrocarbons, peroxide, formaldehyde, acetaldehyde, CO2 and Co. The mixed gases generated from 210 ℃ to 250 ℃ are formaldehyde, unsaturated hydrocarbon, organic acid, organic chloride, Co, etc. Formaldehyde and acrolein are produced during hot cutting and sealing polyethylene pipe. Such pyrolytic products can cause poisoning. ② Polyethylene (PE): it is not non-toxic, but it is toxic when antioxidants, stabilizers and colorants are added. When heated to 150 ℃ ~ 220 ℃, the pyrolysis products include acid, ester, unsaturated hydrocarbon, peroxide, formaldehyde, acetaldehyde, CO2 and Co. It can be seen from the above that TVOC should not be non methane hydrocarbon, but TVOC should be better. In addition, the pyrolysis amount is not as large as 0.1% - 0.5%, and the material loss of nozzle material, glans material and even test material in injection molding production is only 1-2%, and the pyrolysis amount is certainly not so large. However, different plastic parts will be different. The heat release loss of injection molded parts and film products will be different, which is generally calculated according to 0.01% of the consumption of raw materials. 2) The raw material of PVC injection molding process is PVC. HCl and free vinyl chloride may be released from waste gas. However, if the raw material contains POM (polyoxymethylene), formaldehyde may be released. In addition, due to the complexity of the process waste gas composition in granulation process, some places use the calculation of non methane hydrocarbons for quantitative evaluation, and some places also use the calculation of VOC (volatile organic compounds) for quantitative evaluation. Because the heating temperature during granulation is generally controlled within the allowable range of plastic raw materials, the amount of decomposed monomer is very small, and the heating is generally carried out in a closed container, only a small amount of monomer is discharged. Generally speaking, the monomer produced by thermal decomposition is only 0.01-0.02% of the total amount, calculated as 100-200 g / T product. The composition of waste gas in granulation process is complex, and the composition of waste gas produced by different raw materials is different. Polyvinyl chloride (PVC) is a kind of high molecular compound which is polymerized from vinyl chloride. It is thermoplastic and has a glass transition temperature of 80 ℃～ 85 ℃. The industrial product is white or light yellow powder with relative density of 1.4 and chlorine content of 56-58%. Low molecular weight is easily soluble in ketones, esters and chlorinated hydrocarbon solvents. It has excellent chemical resistance. Thermal stability and light resistance are poor. Hydrogen chloride begins to decompose when exposed to sunlight above 100 ℃ or for a long time. PVC will be degraded by heat during processing. Due to the release of HCl, the number of conjugated double bonds in polyene structure molecules increases. When the number reaches more than 8, the absorption of light wave begins to converge, so the color will gradually deepen (yellow → brown → Brown). According to the different release rate of HCl, the degradation temperature can be divided into four stages, as follows: (1) early coloring degradation: HCl begins to release at 100 ~ 130 ℃, but the release rate is very small. PVC gradually changes color after being exposed to this temperature for more than 10 days. (2) In the middle stage, the release rate of HCl increased gradually from 140 ℃ to 160 ℃. (3) Long term thermal degradation: 160 ~ 220 ℃ (4) Complete degradation: HCl was released completely above 220 ℃. Injection molding waste gas treatment equipment introduction: VOC waste gas treatment technology - oxidation method for toxic, harmful, and does not need to recover VOC, thermal oxidation method is the most suitable treatment technology and method. The basic principle of oxidation method: VOC reacts with O2 to form CO2 and H2O. From the chemical reaction equation, the oxidation reaction is similar to the chemical combustion process, but due to the low concentration of VOC, no visible flame will be produced in the chemical reaction. Generally, oxidation process can ensure the smooth progress of oxidation reaction by two methods: a) heating. Make the organic waste gas containing VOC reach the reaction temperature; b) Use catalyst. If the temperature is lower, the oxidation reaction can be carried out on the surface of the catalyst. Therefore, the oxidation method of organic waste gas treatment can be divided into the following two methods: a) catalytic oxidation method. At present, there are two kinds of catalysts used in catalytic oxidation, namely noble metal catalyst and non noble metal catalyst. Noble metal catalysts mainly include Pt, PD and so on, which are attached to the catalyst support in the form of fine particles, while the catalyst support is usually metal or ceramic honeycomb or bulk packing; Non noble metal catalysts are mainly composed of transition metal oxides, such as MnO2, mixed with binder in a certain proportion, and then made into catalyst. In order to effectively prevent the catalyst from losing its catalytic activity after poisoning, the toxic substances such as Pb, Zn and Hg must be completely removed before treatment. If the catalyst poison and covering substance in the organic waste gas cannot be removed, the catalytic oxidation method can not be used to treat VOC; b) Thermal oxidation. At present, there are three kinds of thermal oxidation methods: thermal combustion type, wall type and regenerative type. The main difference between the three methods is the way of heat recovery. These three methods can be combined with catalytic method to reduce the reaction temperature. Thermal combustion thermal oxidizer, generally refers to gas incinerator. The gas incinerator consists of combustion supporting agent, mixing zone and combustion chamber. Among them, combustion supporting agents, such as natural gas and oil, are auxiliary fuels. In the combustion process, the hot mixing zone generated in the incinerator can preheat VOC waste gas. After preheating, it can provide enough space and time for the treatment of organic waste gas, and finally realize the harmless treatment of organic waste gas. Under the condition of sufficient oxygen supply, the degree of oxidation reaction -- VOC removal rate -- mainly depends on the "three T conditions": reaction temperature, time and turbulence mixing. molecular sieve These "three T conditions" are interrelated. In a certain range, the improvement of one condition can reduce the other two conditions. Direct fired waste gas treatment furnace; required temperature: 700-800 ℃; corresponding waste gas type: all; waste gas purification efficiency is above 99.8%; with waste gas heat recovery system, the operating cost of the plant can be effectively reduced by catalytic waste gas treatment furnace (RCO) Required temperature: 300-400 degrees centigrade · spontaneous combustion starting according to the concentration of waste gas · system design: cleaning with pre-treatment agent and catalyst can prolong the service life of the equipment. Various adsorption materials can be configured at the front end of the RCO treatment technology, which is especially suitable for the occasions with high demand for heat recovery rate and the same production line, Where the composition of exhaust gas often changes or the concentration of exhaust gas fluctuates greatly.
How much is the price of RTO equipment Advantages: simple process, compact equipment and reliable operation; The purification efficiency is higher than 98%; Compared with RTO, the combustion temperature is lower; Its heat recovery efficiency can reach more than 85% with low one-time investment and low operating cost; No wastewater was produced in the whole process, and no secondary pollution such as NOx was produced in the purification process; The RCO purification equipment can be used with the drying room, and the purified gas can be directly used in the drying room to achieve the purpose of energy saving and emission reduction; Disadvantages: the catalytic combustion device is only suitable for the treatment of organic waste gas with low boiling point organic composition and low ash content, while it is not suitable for the treatment of waste gas containing viscous substances such as lampblack, and the catalyst should be poisoned; The concentration of organic waste gas is below 20%. How much is the price of RTO equipment When the concentration of organic waste gas is more than 450 ppm, the RTO unit does not need to add auxiliary fuel; The purification rate of two bed RTO and three bed RTO can reach more than 98% and 99% respectively, without secondary pollution such as NOx; Automatic control, simple operation; High security.
How much is the price of RTO equipment Advantages: the operation cost is very low when treating large flow and low concentration organic waste gas. How much is the price of RTO equipment Disadvantages: high one-time investment, high combustion temperature, not suitable for the treatment of high concentration of organic waste gas, there are many moving parts, need more maintenance work. The picture shows RTO (regenerative thermal incineration technology) concentration and waste heat recovery system, which can concentrate VOCs waste gas with low concentration and large air volume into high concentration and small air volume waste gas, and then burn at high temperature, and recover the heat of heat storage body, which can be used in waste gas preheating and heat conversion equipment. The recovery type thermal incineration system (referred to as tnv) is a kind of waste gas containing organic solvent which is directly burned by gas or oil. Under the action of high temperature, the organic solvent molecules are oxidized and decomposed into CO2 and water. The high temperature flue gas generated is heated by the matching multi-stage heat exchanger to heat the air or hot water needed in the production process, The heat energy generated by the oxidation and decomposition of organic waste gas is fully recovered and utilized to reduce the energy consumption of the whole system. How much is the price of RTO equipment Therefore, tnv system is an efficient and ideal way to treat the waste gas containing organic solvents when a lot of heat is needed in the production process. For the new coating production line, the tnv recovery thermal incineration system is generally used. The tnv system consists of three parts: waste gas preheating and incineration system, circulating air heating system and fresh air heat exchange system. The characteristics of waste gas incineration central heating device include: the residence time of organic waste gas in the combustion chamber is 1 ~ 2 s; The decomposition rate of organic waste gas is more than 99%; The heat recovery rate can reach 76%; The adjustment ratio of burner output can reach 26 ∶ 1 and the highest is 40 ∶ 1. Disadvantages: when treating low concentration organic waste gas, the operation cost is high; Tube heat exchanger has a long life only when it runs continuously. How much is the price of RTO equipment VOC waste gas treatment technology condensation recovery method at different temperatures, the saturation of organic matter is different, condensation recovery method is to use the characteristics of organic matter to play a role, by reducing or increasing the system pressure, the organic matter in the steam environment is extracted by condensation.
After condensation and extraction, the organic waste gas can be highly purified. Its disadvantage is that it is difficult to operate, and it is not easy to use cooling water to complete at normal temperature. It needs to cool the condensate water, so it needs more expenses. How much is the price of RTO equipment
Source: Pingxiang Jianghua environmental protection RTO equipment network
Article title: how much is the equipment? Introduce the direct combustion method of spraying waste gas treatment (how much is the price of RTO equipment)
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