CN216878578U - Nitrogen protection's degrease technology organic waste gas condensation recovery processing system - Google Patents
Nitrogen protection's degrease technology organic waste gas condensation recovery processing system Download PDFInfo
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- CN216878578U CN216878578U CN202220249624.7U CN202220249624U CN216878578U CN 216878578 U CN216878578 U CN 216878578U CN 202220249624 U CN202220249624 U CN 202220249624U CN 216878578 U CN216878578 U CN 216878578U
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Abstract
The utility model discloses a nitrogen-protected organic waste gas condensation and recovery treatment system for a degreasing process, which comprises a nitrogen generator, an organic waste gas generation device, a heat exchanger, a condenser, a fan, a first flow controller and an adsorption and desorption system which are sequentially connected; the condensate outlet of the condenser is connected with a collecting tank. According to the nitrogen-protected degreasing process organic waste gas condensation recovery treatment system, nitrogen is used as the blowing gas and the carrier gas, the gas in the system can be blown to the oxygen content of almost zero, the nitrogen is used as the main component in the operation process, the explosion risk of organic pollutants can be almost completely avoided under the condition of almost no oxygen, the safety of the system is improved, and the treatment gas amount can be obviously reduced.
Description
Technical Field
The utility model relates to the technical field of environmental protection, in particular to a nitrogen-protected condensation and recovery treatment system for organic waste gas of a degreasing process.
Background
In the general organic waste gas treatment process, considering factors such as explosion limit concentration of organic pollutants, a large treatment gas amount is required to reduce the concentrations of the organic pollutants and oxygen, and for recycling the organic pollutants in the waste gas, operations of adsorption enrichment, desorption, condensation and recovery of adsorbents such as activated carbon are generally performed.
Patent specification with publication number CN 111617594 a discloses a process for recycling organic waste gas by activated carbon adsorption and nitrogen desorption condensation, which comprises the following steps: the organic waste gas enters an activated carbon adsorption tank through a filter for adsorption, and after the adsorption of the activated carbon adsorption tank is completed, the system enters a desorption stage; at the moment, the other activated carbon adsorption tank arranged in parallel carries out adsorption; condensing the desorbed organic waste gas by a condenser to obtain an organic matter cooling liquid, introducing the condensed air to cool the activated carbon adsorption tank after the circulation adsorption is finished so as to facilitate the next circulation use; and a plurality of activated carbon adsorption tanks arranged in parallel alternately perform the steps.
The patent specification with the publication number of CN 205412597U discloses an energy-saving organic waste gas condensing and recycling device, which comprises a shell provided with an air inlet and an air outlet, wherein the air inlet is provided with an air inlet door, the air outlet is provided with an air outlet door, a heating area, an adsorption area and a condensation area are sequentially arranged between the air inlet and the air outlet in the shell, an air duct with the air door is arranged between the adsorption area and the condensation area, the heating area is provided with a heater, the adsorption area is provided with an organic matter adsorption material, and the condensation area is provided with a surface cooler; a desorption channel is arranged between the adsorption zone and the heating zone; a heat circulating channel is arranged between the condensing zone and the heating zone; the heat circulation channel and the desorption channel are both provided with heat exchangers, and the heat circulation channel is also provided with a fan.
SUMMERY OF THE UTILITY MODEL
The utility model provides a nitrogen-protected organic waste gas condensation and recovery treatment system for a degreasing process, which uses nitrogen as a blowing gas and a carrier gas, can blow gas in the system to the oxygen content of almost zero, takes the nitrogen as a main component in the operation process, can almost completely avoid the explosion risk of organic pollutants under the condition of almost no oxygen, improves the safety of the system, and can also obviously reduce the treatment gas amount.
The specific technical scheme is as follows:
a nitrogen-protected degreasing process organic waste gas condensation recovery treatment system comprises a nitrogen generator, an organic waste gas generation device, a heat exchanger, a condenser, a fan, a first flow controller and an adsorption and desorption system which are sequentially connected;
the condensate outlet of the condenser is connected with a collecting tank.
When the degreasing process organic waste gas condensation recovery processing system protected by nitrogen is used, nitrogen is generated by the nitrogen generator firstly, oxygen in each device, part and pipeline of the system is exhausted, under the action of the fan, hot organic waste gas generated by the organic waste gas generating device during operation is carried by nitrogen carrier gas and is cooled by the heat exchanger and then enters the condenser, organic pollutants in the organic waste gas in the condenser are condensed and enter the collecting tank for recycling, non-condensable matters (possibly including some non-condensable organic pollutants) enter the absorption and desorption system through the fan and the first flow controller, the adsorption of the non-condensable organic pollutants is completed, and clean gas is finally discharged.
In a preferred embodiment, in the nitrogen-protected degreasing process organic waste gas condensation and recovery processing system, a first bypass connected with the organic waste gas generation device is arranged between the fan and the first flow controller, a second flow controller is arranged on the first bypass, and condensed organic waste gas can flow back to the organic waste gas generation device to be used as make-up gas, so that the nitrogen consumption is reduced, and the working cost of the nitrogen generator is reduced.
In a preferred embodiment, the nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process comprises at least two adsorption tanks, and the first flow controller is in switchable communication with any one or more adsorption tanks to adsorb residual organic pollutants.
Further, for any adsorption tank, when it is connected with the first flow controller, its gas outlet is connected with the cooling medium inlet of the heat exchanger. The gas outlet of the adsorption tank communicated with the first flow controller flows out relatively cold clean gas which can be used as a cooling medium to cool the nitrogen carrying the hot organic waste gas in the heat exchanger. The cooling medium of the heat exchanger may be cooling water or the like in addition to the above-mentioned relatively cool clean gas.
In a preferred embodiment, in the nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process, the cooling medium outlet of the heat exchanger is divided into two paths, one path is communicated with the atmosphere through a valve, and the other path is switchably communicated with any one or more adsorption tanks which are adsorbed with non-condensable organic pollutants through a heating device. When the relatively cold clean gas flowing out of the gas outlet of the adsorption tank communicated with the first flow controller is used as a cooling medium of the heat exchanger, the temperature of the clean gas rises after heat exchange with nitrogen carrying hot organic waste gas, and the clean gas can enter the adsorption tank which adsorbs noncondensable organic pollutants after being further heated by the heating device and is used for desorbing the organic pollutants adsorbed in the adsorption tank. The adsorption tank can be provided with heating components such as electric heating components and the like for desorption.
Furthermore, the nitrogen-protected degreasing process organic waste gas condensation recovery treatment system is characterized in that a second bypass is arranged between the organic waste gas generation device and the heat exchanger, and a gas outlet of any adsorption tank is communicated with the second bypass when the adsorption tank is communicated with the heating device. What the gas outlet of the adsorption tank that communicates with heating device flows is the hotter gas that contains the organic pollutant of noncondensation, gets into the colder clean gas of heat exchanger heatable, preheats for follow-up desorption, reduces heating device's operating pressure, and is further, can get into the condenser of transferring lower temperature and carry out the degree of depth condensation to can recycle the organic pollutant of noncondensation under former condensing temperature.
In a preferred embodiment, the nitrogen-protected degreasing process organic waste gas condensation and recovery treatment system comprises at least two carbon molecular sieve nitrogen making devices which can be alternately used.
In a preferred embodiment, in the nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process, a filtering device is arranged between the condenser and the collecting tank and used for filtering particulate matters, so that the particulate matters and pure liquid organic matters are respectively collected.
In a preferred example, the nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process is a finned tube heat exchanger.
In a preferred embodiment, the nitrogen-protected organic waste gas condensation and recovery processing system for the degreasing process is provided with an oxygen detector and a temperature regulating valve. The oxygen detector can display the oxygen concentration in the organic waste gas generating device in real time, so that the nitrogen amount generated by the nitrogen generator can be adjusted according to the oxygen concentration, the overall low or even 0 oxygen concentration of the system is ensured, the safety of the system is improved, and explosion is avoided. The temperature regulating valve can be opened when the temperature in the organic waste gas generating device is too high, so that the temperature is reduced.
In a preferred example, the nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process is provided with a PLC control system capable of controlling the actions of all the components.
Compared with the prior art, the utility model has the main advantages that:
according to the nitrogen-protected degreasing process organic waste gas condensation recovery treatment system, nitrogen is used as the purge gas and the carrier gas, the gas in the system can be purged until the oxygen content is almost zero, and the nitrogen is used as the main component in the operation process, so that the organic pollutant explosion risk can be almost completely avoided under the condition of almost no oxygen, the safety of the system is improved, and the treatment gas amount can be remarkably reduced.
The nitrogen-protected degreasing process organic waste gas condensation recovery treatment system is reasonable and compact in structural layout, convenient to operate, manage and maintain, capable of saving power consumption and reducing operating cost, optimized in pipeline system design, and capable of paying attention to pipeline sealing and shock absorption, improving organic waste gas collection efficiency and ensuring that all volatile organic waste gases are discharged after reaching standards after being treated.
Drawings
FIG. 1 is a schematic view of an embodiment of a nitrogen-protected organic waste gas condensing and recycling system for degreasing process;
in the figure:
1-Nitrogen generator 2-organic waste gas generating device 3-heat exchanger
4-condenser 5-fan 6-collecting tank
7-first flow controller 8-heating device 9-adsorption and desorption system
10-second flow controller.
Detailed Description
The utility model is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
As shown in fig. 1, the nitrogen-protected organic waste gas condensation and recovery processing system for degreasing process in the present embodiment includes a nitrogen generator 1, an organic waste gas generating device 2, a heat exchanger 3, a condenser 4, a fan 5, a first flow controller 7, and an adsorption and desorption system 9, which are connected in sequence.
The condensate outlet of the condenser 4 is connected with a filtering device (not shown) and a collecting tank 6 in sequence.
A first bypass connected with the organic waste gas generating device 2 is arranged between the fan 5 and the first flow controller 7, and a second flow controller 10 is arranged on the first bypass.
The adsorption and desorption system 9 comprises two adsorption tanks, and the first flow controller 7 is in switchable communication with any one or two adsorption tanks.
For any of the adsorption tanks, when it is connected to the first flow controller 7, its gas outlet is connected to the cooling medium inlet of the heat exchanger 3.
The outlet of the cooling medium of the heat exchanger 3 is divided into two paths, wherein one path is communicated with the atmosphere through a valve (not shown), and the other path is switchably communicated with any one or two adsorption tanks which are adsorbed with non-condensable organic pollutants through a heating device 8.
A second bypass is arranged between the organic waste gas generating device 2 and the heat exchanger 3, and when any adsorption tank is communicated with the heating device 8, the gas outlet of the adsorption tank is communicated with the second bypass.
The nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process is further provided with a PLC control system capable of controlling the actions of all the components.
Application example
The nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process is applied to degreasing waste gas treatment and organic pollutant condensation and recovery in a PTFE (polytetrafluoroethylene) film production workshop. The organic waste gas generating device 2 is a degreasing oven (degreasing furnace) in a material thermal processing workshop, a nitrogen inlet and a feed inlet of the organic waste gas generating device share the same port, and the nitrogen inlet and the feed inlet are well sealed except the feed inlet and a discharge outlet so as to prevent air from entering to the maximum extent. The volume of the degreasing furnace is 0.5-1.5 m3And the working temperature is 250 ℃. The collection amount of the waste gas in hours is set to be 6-20 times of the volume of the degreasing furnace.
The concentration of organic pollutants in the waste gas generated by the degreasing furnace is higher than 150g/m3The main component is hydrogenated heavy naphtha (CAS: 64742-48-9), also called isoparaffin, is C11H24Mixed alkanes of predominantly isomeric forms, average moleculesThe amount is about 156, the saturated vapor pressure at 20 ℃ is 0.106kPa, the vapor density/air density is 5.4, and the explosion limit V/V is 0.7-5.4%. The application example adopts the design of excessive nitrogen protection, prevents air from entering the degreasing furnace, and isolates air oxidation. The degreasing furnace is provided with an oxygen detector and a temperature regulating valve, and the degreasing furnace is heated after the oxygen content in the degreasing furnace reaches the standard.
The outlet temperature of the condenser 4 is less than 40 ℃, 65 vol% of condensed organic waste gas passes through the fan 5 and then circulates to the degreasing furnace, and 35% of the condensed organic waste gas enters the absorption and desorption system 9. The two adsorption tanks in the adsorption-desorption system 9 are used alternately, i.e. one is used for adsorption and the other is used for desorption.
The nitrogen generator 1 includes two carbon molecular sieve nitrogen generation devices that can be used alternately. Compressed air flows through the adsorption tower from bottom to top, components such as oxygen, water, carbon dioxide and the like are adsorbed on the surface of the carbon molecular sieve by utilizing different adsorption forces of the molecular sieve on nitrogen, oxygen and the like under different pressures, and nitrogen which is not adsorbed is collected at an outlet to become product gas which flows out of the upper end of the adsorption tower and enters the buffer tank. After a period of time, the oxygen adsorbed by the carbon molecular sieve in the adsorption tower is saturated and needs to be regenerated. Regeneration is accomplished by stopping the adsorption step and reducing the pressure in the adsorption column. After the short-term pressure equalization of the adsorption tower is completed, the pressure reduction is started, the adsorbed components such as oxygen, water, carbon dioxide and the like are removed, and the regeneration process is completed. The two adsorption towers are alternately used for adsorption and regeneration, so that the product nitrogen with stable flow and purity is generated.
The heat exchanger 3 is a finned tube heat exchanger. The hot gas travels through the tube pass. The gas outlet of the adsorption tank, which is connected to the first flow controller 7, discharges relatively cool clean gas, which can be used as a cooling medium to cool the nitrogen gas carrying the hot organic waste gas in the heat exchanger 3. Atomized water vapor can be sprayed on the fins to realize evaporation heat absorption assisted air cooling scattering, the gas is rapidly cooled from a thermal state of more than or equal to 200 ℃ to below 40 ℃, and the concentration of isoparaffin after gas condensation is controlled to be lower than 24g/m3. After the gas is cooled, the isoparaffin with the concentration higher than the saturation concentration is separated out and liquefied to form fog drops, when the gas passes through the filtering material of the filtering device, the liquid drops are partially captured and collected to form regenerated raw oil, the particulate matters are intercepted by the filter,the system periodically changes the filter.
The adsorption tank adopts granular activated carbon as an adsorbent to carry out adsorption and desorption, the adsorption working temperature of the adsorption tank is lower than 40 ℃, the desorption working temperature is not lower than 230 ℃, heat exchange heating is adopted, electric heating heat compensation is adopted for insufficient temperature, high-concentration waste gas after desorption enters a condenser 4 to further separate isoparaffin after being preliminarily cooled by a heat exchanger 3. Activated carbon does not have the risk of spontaneous combustion under the protection of nitrogen, and adsorption tank desorption operating temperature can be higher, and the desorption is more thorough, and the security can obtain guaranteeing.
When the nitrogen-protected degreasing process organic waste gas condensation recovery treatment system of the application example is used, nitrogen is generated by the nitrogen generator 1, oxygen in each device, part and pipeline of the system is exhausted, under the action of the fan 5, hot organic waste gas generated by the operation of the degreasing furnace is carried by nitrogen carrier gas and is cooled by the heat exchanger 3 and then enters the condenser 4, organic pollutants in the organic waste gas in the condenser 4 are condensed and then enter the collection tank 6 through the filtering device for recycling of liquid organic matters, non-condensable matters (possibly including some non-condensable organic pollutants) enter the adsorption tank through the fan 5 and the first flow controller 7 to complete adsorption of the non-condensable organic pollutants, the temperature of clean gas exhausted after adsorption of the adsorption tank is low, the clean gas can be used as a cooling medium for primarily cooling the entering hot waste gas by the heat exchanger 3, and can be directly exhausted after the temperature of the clean gas rises, also can be used as the desorption gas and be used for the desorption process of another adsorption tank after heating by heating device 8, the gas that has organic pollutant that the desorption produced can carry out the circulation degree of depth desorption and recycle of organic pollutant through heat exchanger 3 cooling, condenser 4 condensation once more.
The Total Volatile Organic Compound (TVOC) removal rate of the nitrogen-protected degreasing process organic waste gas condensation recovery treatment system in the application example is 99.65%, and the emission is 0.007t isoparaffin/year.
According to the requirements of the emission standard of pollutants for the synthetic resin industry (GB31572-2015), the emission of non-methane total hydrocarbons (isoparaffin in the embodiment) of all the resins (except organic silicon resin) is 0.3kg/t of the product. The Polytetrafluoroethylene (PTFE) film of the application example is produced by 300 kilometers every year and is about 25t, and finally, the non-methane total hydrocarbon emission of the unit product of the application example is converted to 0.28kg/t, which meets the requirement.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the utility model as defined by the appended claims.
Claims (10)
1. The nitrogen-protected organic waste gas condensation and recovery treatment system for the degreasing process is characterized by comprising a nitrogen generator (1), an organic waste gas generation device (2), a heat exchanger (3), a condenser (4), a fan (5), a first flow controller (7) and an adsorption and desorption system (9) which are sequentially connected;
the condensate outlet of the condenser (4) is connected with a collecting tank (6).
2. The nitrogen-protected degreasing process organic waste gas condensation and recovery processing system is characterized in that a first bypass connected with the organic waste gas generation device (2) is arranged between the fan (5) and the first flow controller (7), and a second flow controller (10) is arranged on the first bypass.
3. The nitrogen-protected degreasing process organic waste gas condensation recovery processing system as claimed in claim 1, wherein the adsorption and desorption system (9) comprises at least two adsorption tanks, and the first flow controller (7) is switchably communicated with any one or more adsorption tanks;
for any adsorption tank, when the adsorption tank is communicated with the first flow controller (7), the gas outlet of the adsorption tank is communicated with the cooling medium inlet of the heat exchanger (3).
4. The nitrogen-protected degreasing process organic waste gas condensation recovery treatment system as claimed in claim 3, wherein the cooling medium outlet of the heat exchanger (3) is divided into two paths, one path is communicated with the atmosphere through a valve, and the other path is switchably communicated with any one or more adsorption tanks adsorbed with non-condensable organic pollutants through a heating device (8).
5. The nitrogen-protected degreasing process organic waste gas condensation and recovery treatment system is characterized in that a second bypass is arranged between the organic waste gas generation device (2) and the heat exchanger (3);
for any canister, its gas outlet communicates with the second bypass when it is connected to the heating means (8).
6. The nitrogen-protected degreasing process organic waste gas condensation recovery processing system as claimed in claim 1, wherein the nitrogen generator (1) comprises at least two carbon molecular sieve nitrogen generation devices which can be used alternately.
7. The nitrogen-protected degreasing process organic waste gas condensation and recovery processing system as claimed in claim 1, wherein a filtering device is arranged between the condenser (4) and the collection tank (6).
8. The nitrogen-protected degreasing process organic waste gas condensation recovery treatment system as claimed in claim 1, wherein the heat exchanger (3) is a finned tube heat exchanger.
9. The nitrogen-protected degreasing process organic waste gas condensation and recovery processing system as claimed in claim 1, wherein the organic waste gas generation device (2) is provided with an oxygen detector and a temperature regulating valve.
10. The nitrogen-protected degreasing process organic waste gas condensation and recovery treatment system as claimed in any one of claims 1 to 9, wherein the nitrogen-protected degreasing process organic waste gas condensation and recovery treatment system is provided with a PLC control system capable of controlling actions of each component.
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| CN202220249624.7U CN216878578U (en) | 2022-01-30 | 2022-01-30 | Nitrogen protection's degrease technology organic waste gas condensation recovery processing system |
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