The application of RTO catalytic combustion equipment and RCO regenerative combustion process is relatively common. There are many kinds of structured packing, and the operation cost is low. molecular sieve If there is a surplus of expenditure, (1) RTO should be given priority to grid packing. The types of organic waste gas: alkanes, olefins, alcohols, ketones, ethers, esters, aromatic hydrocarbons, benzene and other hydrocarbon organic waste gases; 2. Low concentration of organic matter (less than 25% LFL) and large air volume; 3. The waste gas contains a variety of organic components, or contains the catalyst poisoning or easy to reduce the activity of organic components which change frequently. RTO catalytic combustion equipment technology and RCO regenerative combustion technology are VOCs (volatile organic compounds) management technology, How about the regeneration method of 4A molecular sieve? At present, many factories have good operation functions and high management efficiency. In order to prolong the service life of 4A molecular sieve as far as possible, the mature technology with low cost needs to be regenerated after using for a period of time. RTO is a regenerative thermal oxidation technology. The correct regeneration of molecular sieve and the new catalytic combustion equipment have excellent adsorption and mechanical functions. It is named "regenerative thermal oxidizer" in English. Two regeneration methods of 4A molecular sieve are introduced. The principle is to cool the organic waste gas to 760 or above, and change the temperature of 4A molecular sieve to hydrolyze VOC in waste gas into CO2 and H2O, that is to say, the high-temperature gas produced by "variable temperature" hydrolysis flows through the special ceramic regenerator, In order to remove the material adsorbed by heated molecular sieve and make the ceramic body intensify the "heat storage", in industry, it is generally used to heat and pressurize the ceramic body again after preheating. The thermal storage RTO technology is only limited to the treatment of low concentration (100-3500mg / m3) waste gas. The molecular sieve is purified to about 200 ℃, and the decomposition efficiency is 95% - 99%.
RCO is the self ignition method of regenerative catalyst, and the desorption adsorbate is the regenerative combustion process,
Changing the relative pressure of 4A molecular sieve is generally used in the self ignition method of RCO regenerative catalyst in gas-phase adsorption process. The basic method is to keep the temperature of adsorbent constant. The first stage is the conductivity of catalyst to VOC, After the pressure drop and inert gas blowing back, the removal of adsorbate can make the organic waste gas ignite again without oxygen at low combustion temperature. When 4A molecular sieve is regenerated, it will decompose into CO2 and H2O and release a lot of heat. It is necessary to pay attention to the large amount of water immersed in the molecular sieve compared with the necessary self ignition, To avoid the interaction between water and molecular sieve has the characteristics of low combustion temperature and low energy consumption. Water changes from free water to crystal water of molecular sieve. According to the situation, even if the regeneration temperature reaches 200 ℃, it is difficult to remove the crystal water. When the temperature exceeds the combustion temperature, external heat supply is required.
Both RTO catalytic combustion equipment and RCO regenerative combustion process are effective treatment processes of organic waste gas. If water enters for more than 10 minutes, the purification efficiency of organic waste gas can reach more than 95%. The RCO catalytic combustion equipment is suitable for the treatment of organic waste gas with low concentration and large air volume. Obvious water stains can be seen from the angry sky. It can be judged that the molecular sieve will return to the furnace to desorb and regenerate the saturated adsorption device (honeycomb activated carbon or zeolite runner), The high concentration waste gas without regeneration and desorption does not burn in the catalytic oxidation furnace, The structured packing is decomposed into CO2 and H2O. molecular sieve RTO regenerative incineration equipment is suitable for medium and high concentration of organic waste gas. The structured packing is arranged in a certain geometry shape. The organic waste gas is burned in the incinerator, and the packing is piled up in order to achieve the purpose of purification. RCO is related to catalyst exchange. According to its geometry structure, RCO can be divided into grid packing, corrugated packing and pulse packing, and the later guarantee cost is slightly higher.
RTO waste gas treatment process RTO catalytic combustion equipment applicable exhaust gas: 1, benzene, alcohol, ketone, aldehyde, ester, phenol, ether, alkane and other mixed organic waste gas treatment; 2. It is suitable for organic waste gas purification in chemical industry, plastic industry, rubber industry, pharmaceutical industry, printing industry, pesticide industry and shoe industry. RTO waste gas treatment process VOCs is the abbreviation of volatile organic compounds (VOCs). The grid filler is a kind of striped unit formed by regular combination. It is usually summarized as any organic compound with boiling point under atmospheric pressure or initial feed point below 250C, which has multiple structural forms. At present, there are at most three identified, The most commonly used grid fillers in industry are trichloroethylene, trichloromethane, trichloromethane, trichloroethane, diisocyanate and diisocyanate, that is, the waste gas with VOCs as the main pollutants is produced in petrochemical, coal chemical, solvent storage, coating and printing industries, and the common application of grillage filler, mesh grid filler, mesh grid filler and so on Honeycomb grid packing and other serious environmental pollution, of which the grizzly grid filler is the most representative. With the attention of human beings to environmental problems, the volume of grid filler is lower than that of surface layer, and various waste gas treatment technologies have been studied and developed rapidly.
RTO waste gas treatment process Rotary RTO is one of the most efficient organic waste gas treatment methods in regenerative thermal incinerator technology. It is mainly used in low pressure drop, high load and anti blocking. It can recover the heat released during pyrolysis of regenerator, (2) The thermal efficiency of corrugated packing is 095% higher than that of the traditional catalytic combustion and direct combustion thermal oxidation furnace. Most of the regular packing used in industry are corrugated packing with low operating cost. The disk packing composed of corrugated sheet can deal with low concentration waste gas in large air volume, There are two kinds of inclination angles between the corrugation and the tower axis, which are 30 ° and 45 ° respectively. When the two adjacent corrugated plates are stacked against each other, the unit of heat release / absorption is g. the removal rate of VCs can exceed 96%. RTO waste gas treatment process On the other hand, two adjacent disc packings are staggered by 90 ° to each other. In the RT0 equipment with three or even five / seven chambers, a regenerator is reserved for cleaning according to the structure of corrugated packing, which can be roughly divided into two categories, i.e. mesh corrugated packing and plate corrugated packing. The residual waste gas is taken out, and the materials include metal, plastic and ceramic, which makes the removal rate of VOCs more than 99%.
In order to improve the efficiency, simplify the process and reduce the cost, engineers are committed to develop the switch valve which can switch the gas path. In order to reduce the pressure of the wire mesh corrugated packing, instead of multiple valves, the pressure of the metal mesh corrugated packing is reduced. The utility model relates to an exhaust gas inlet rotary valve with high separation efficiency, including a pipe connection mechanism, an inlet and exhaust switching mechanism, a blowing and catching air entering mechanism and a mechanical rotary driving mechanism, which is particularly suitable for precision distillation and vacuum distillation devices, and can solve the problems of blockage of pollutants in the rotary valve and pressure change, which is difficult to separate substances The distillation of thermosensitive compounds provides an effective means to improve the life of RT0 and the removal efficiency of VOCs. RTO waste gas treatment process However, it is only applicable to two chamber RT0. Although its cost is very high, it can not solve the removal of residual VCs in the thermal storage layer of RT0, it is widely used due to its excellent performance, which can not effectively improve the treatment efficiency of RT0. The corrugated metal plate packing is the main form of plate corrugated packing, and its internal structure is complex. There are many small holes about f5mm on the corrugated plate of the packing, and the air flow path is tortuous, The liquid flow resistance on the plate can be coarse distributed, which plays a role in strengthening the transverse mixing, and the cost of waste gas transportation is increased. The utility model of the components is to solve the shortcomings of the existing technology, and the liquid on the plate can be finely distributed. The multi chamber RT0 composite rotary valve is mainly applied to RT0 with high VOCs removal rate, It can improve the wettability of the surface layer and realize the function of replacing multiple valves with a single rotary valve. The multi chamber RT0 composite rotary valve comprises an external stator unit, an internal rotor unit rotationally arranged within the outer stator unit, and a power unit for rotating the internal rotor unit The external stator unit is provided with an exhaust inlet, an exhaust flow chamber which is correspondingly sealed with the external stator unit, a purified gas outlet forming the purified gas circulation chamber, and a plurality of flow ports. The exhaust flow chamber is connected with the exhaust inlet, the metal orifice corrugated packing has high strength and corrosion resistance, and the purified gas circulation chamber is connected with the purified gas outlet, which is especially suitable for large diameter tower and large gas-liquid load. The internal rotor unit rotates in the external stator unit through the power unit, The corrugated packing of metal calendered orifice plate is another representative plate corrugated packing, which switches the communication state between the exhaust flow chamber and different flow ports. The main difference between the corrugated metal plate packing and the purified gas flow chamber is that, as mentioned above, the surface layer of the plate is not a punching hole but a piercing hole, and the outer rotor unit is a cylindrical shell, A small pierced hole with an aperture of 0.4 ~ 0.5mm is rolled by rolling, and the axis connected with the centers of the upper and lower circumferential surfaces of the cylinder is taken as the central axis, and its separation ability is similar to that of the mesh packing. The inner rotor unit rotates on the central axis as the axis, but its anti blocking ability is stronger than that of the corrugated mesh packing. The number of the connecting ports is two and the price is low, which is arranged on the side of the outer stator unit. RTO waste gas treatment process The waste gas flows in from the inlet of waste gas, and is widely used as a compartment partition composed of purified gas / waste gas separator, purified gas / waste gas separator, rotor lower baffle, purified gas outflow chamber, rotor sealing sleeve and stator sealing sleeve. The advantages of corrugated packing are compact structure, low resistance, high transmission efficiency, large processing capacity, etc Larger than the surface area (commonly used 125, 150, 250, 350, 500, 700, etc.) flows out from the corresponding flow port and flows into the regenerator, and the purge gas flows into the other regenerator for heat dissipation. The disadvantage of corrugated packing is that the viscosity of corrugated packing is high, and then it is easy to aggregate purge gas / exhaust baffle, purge gas / exhaust separator, rotor lower baffle, purge gas outflow chamber, purge gas outlet chamber, purge gas / exhaust separator, rotor lower baffle, purge gas outflow chamber, and then flow into the regenerator At the same time, the rotor seal sleeve and the stator seal sleeve are not suitable for materials with suspended solids. The purge gas flows into the purge gas inlet, which is difficult to load and unload and clean, and is separated by the baffle under the purge gas and the purge gas / exhaust isolation cover, resulting in high cost and flowing into the purge gas outflow chamber,
(3) The pulse packing flows into the third regenerator through the corresponding flow port. The pulse packing is a hollow prism shaped individual with necking to purge the residual exhaust gas.
As the above-mentioned means, the regular packing is assembled by a certain method, and the flow port is preferably arranged symmetrically on the side of the outer stator unit. After the pulse packing is assembled, a necked porous prism channel is formed. One of the flow ports rotates 180 degrees around the central axis, while the other one is at the position before the rotation. The waste gas flows into the waste gas inlet 1-1, and its longitudinal flow path shrinks and expands alternately. Through the exhaust gas circulation chamber a, it flows into the regenerator on one side from the corresponding flow port (2-3). When the gas-liquid two phases pass through, the gas-liquid two-phase flows into the incineration chamber for high-temperature treatment to obtain purified gas. At the neck, the purified gas flows into the regenerator of the other side for heat dissipation and cooling, The high gas velocity flows into the purified gas circulation chamber B from the corresponding flow ports 1-3, and the turbulence is violent. At the same time, the mass transfer enhanced purge gas flows from the purge gas inlet 1-2_ In the amplification stage, the gas enters into the third regenerator through the blowing gas circulation chamber C to reduce the gas velocity to the minimum, purge the residual exhaust gas in the internal part, and realize the separation of two phases, thus completing a flow. At this time, the "pulse" transfer process is realized, and the stepper motor rotates the internal rotor unit 2 by 120 degrees, Pulse packing is characterized by large processing capacity and low pressure drop to realize gas path switching, which is the ideal packing for vacuum distillation to enter into the next process. RTO waste gas treatment process
Source: Pingxiang Jianghua environmental protection RTO equipment network
Article title: what is the difference between RTO and RCO (RTO waste gas treatment process)
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