CN103585854B - A kind of charcoal absorption, N 2the technique of desorption recycling organic exhaust gas - Google Patents
A kind of charcoal absorption, N 2the technique of desorption recycling organic exhaust gas Download PDFInfo
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- CN103585854B CN103585854B CN201310520571.3A CN201310520571A CN103585854B CN 103585854 B CN103585854 B CN 103585854B CN 201310520571 A CN201310520571 A CN 201310520571A CN 103585854 B CN103585854 B CN 103585854B
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Abstract
The invention provides a kind of charcoal absorption, N
2the technique of desorption recycling organic exhaust gas, described processing step is as follows: organic exhaust gas is carried out pretreatment by the cold filter of table, organic exhaust gas after pretreatment is sent into the first absorbent charcoal adsorption tank again and is adsorbed, after the first absorbent charcoal adsorption tank has adsorbed, system enters desorption stage, now, the second absorbent charcoal adsorption tank enters absorption phase; Organic exhaust gas after desorption reclaims after condensation, and after system desorption completes, tackle the first absorbent charcoal adsorption tank and carry out cooling process to uniform temperature, then carry out blowback to it and sweep, blowback is down to normal temperature after sweeping end, so that next recycles; Described first absorbent charcoal adsorption tank and the above step of the second absorbent charcoal adsorption tank cycle alternation.Present invention process can not cause secondary pollution, and energy consumption is low, and the organic solvent quality reclaimed is purer.
Description
[technical field]
The present invention relates to a kind of charcoal absorption, N
2the technique of desorption recycling organic exhaust gas.
[background technology]
VOCs be a class boiling point 50 DEG C ~ 260 DEG C, saturated vapor pressure, more than the volatile organic compound of 133.3Pa, has very large harm to health and ecological environment under room temperature.How effectively this kind of organic exhaust gas of recycling and administration, can not only avoid environmental pollution, and turn waste into wealth, reduce the cost of investment of enterprise, realize the doulbe-sides' victory of social benefit and economic benefit.
In current organic solvent recovery method, what be most widely used is still based on " charcoal absorption-water vapour desorption-condensation is reclaimed ", but this method exists more problem in actual applications.Developing a kind of in recent years take nitrogen as the organic exhaust gas absorption method of heat carrier.
Such as application number is the Chinese patent of 200810114892.2, disclosing a kind of take nitrogen as active carbon fiber organic gas recovery method and the system of desorption medium, it take NACF as the fixed-bed adsorber of adsorbent, adopt hot nitrogen desorption, energy is recycling organic exhaust gas and nitrogen simultaneously; This desorption recovery process using anti-flammability gas replacement steam as heat carrier efficiently solves the variety of problems because steam desorption brings, and instead of charcoal absorption-water vapour desorption absorption method to a certain extent.But, because the thermal capacity of anti-flammability gas is less than steam, the heat exchange area causing air heat clearing house to need is relatively large, and these volatile organic gas are reclaimed in condensation, required condensation temperature is lower, in addition, the organic exhaust gas of the gas that desorption desorbs still containing higher concentration after condensation, these make this recovery process on engineering application, have certain limitation.
Because VOCs gas boiling point is low, volatile, saturated vapor pressure is more than 133.3Pa at normal temperatures, and heat transmission equipment is had high input, and energy consumption is high, and the organic exhaust gas of condensed gas still containing higher concentration.Prior art mainly adopts the condensation of large area heat exchanger, and reclaim end in desorption condensation and increase a second adsorption device and carry out the condensed gas of adsorption treatment, this not only makes technique more complicated and controls difficulty to strengthen, and too increases the cost of investment of enterprise simultaneously.
[summary of the invention]
The technical problem to be solved in the present invention, is to provide a kind of charcoal absorption, N
2the technique of desorption recycling organic exhaust gas, this technique can not cause secondary pollution, and energy consumption is low, and the organic solvent quality reclaimed is purer.
The present invention is achieved in that
A kind of charcoal absorption, N
2the technique of desorption recycling organic exhaust gas, described processing step is as follows:
Step 10, organic exhaust gas enter the cold filter of table by main air blower and carry out pretreatment, and organic exhaust gas after pretreatment is sent into the first absorbent charcoal adsorption tank again and adsorbed;
Step 20, when first absorbent charcoal adsorption tank absorption arrival one preset breakthrough point time, close and open corresponding valve, make the first absorbent charcoal adsorption tank enter the desorption system stage, the second absorbent charcoal adsorption tank enters the adsorption system stage;
Step 30, the N used in storage nitrogen tank
2replace the gas in the first absorbent charcoal adsorption tank, and the gas displaced is sent back in the cold filter of table, carry out adsorption treatment by the second absorbent charcoal adsorption tank; When online oxygen analyser detects that desorption system oxygen content is less than 0.5%, control desorption system pressure and close N after 4 ~ 10KPa
2supply, adds N in thermal desorption system pipeline
2oN cycle desorption blower fan carries out circulation desorption, the organic exhaust gas parsed divides two parts, a part flows through two-stage condensation equipment, a part is through shunt valve, then two parts gas and vapor permeation, mixed gas reheats, and is then sent in the first absorbent charcoal adsorption tank by circulating fan and proceeds desorption; After flowing through the high-concentration organic waste gas condensation after the desorption of two-stage condensation equipment, enter purification system;
After step 40, desorption terminate, when the layer of charcoal temperature in the first absorbent charcoal adsorption tank drops to below the boiling temperature of VOCs gas, close and open corresponding valve, extraction fresh air carries out blowback and sweeps, and heats the boiling temperature of this fresh air to VOCs gas simultaneously; The gas purged out enters in the cold filter of table again, carries out adsorption treatment by the first absorbent charcoal adsorption tank;
After step 50, blowback sweep end, condensation cooling is carried out to intrasystem gas, the layer of charcoal in the first absorbent charcoal adsorption tank is lowered the temperature, so that next recycles finally by this condensed gas;
Described first absorbent charcoal adsorption tank and the above step of the second absorbent charcoal adsorption tank cycle alternation.
Further, in described step 30, the organic exhaust gas flowing through the desorption of two-stage condensation equipment first tentatively cools through two-stage condensation front equipment end heat exchanger, partial organic substances cooling fluid can be obtained, remaining gas enters further deep layer condensation in B grade condensing unit again, and cooling fluid and condensate recovery liquid enter purification system after intermediate storage tank; The desorption that circulates again is sent back in the first absorbent charcoal adsorption tank after being heated by heater after condensed remainder gas mixes with the organic exhaust gas of the desorption through shunt valve.
Further, in described step 30, partial condensation air quantity (that equipment produces) is respectively 1:1 ~ 1:12 with the ratio of bypass air quantity (that equipment produces), desorption system temperature setting 80 ~ 350 DEG C.
Further, in described step 30, when online oxygen conten analyser detects oxygen content > 2% in desorption system, give the alarm, desorption system stops heating and circulation desorption, opens corresponding valve, again carries out nitrogen displacement in system, as oxygen content < 0.5%, reopen desorption manipulation.
Further, described blowback flyback time is 20% ~ 30% of desorption time; Described anti-purge air quantity is equal with desorption air quantity.
Further, described technique is by PLC control program system whole-process automatic control.
Tool of the present invention has the following advantages:
The present invention adopts partial condensation to reclaim and reverse purging process, not only effectively solve prior art problem, enormously simplify technique, reduce production cost, and the limitation that in overcoming desorption removal process in the past, high, the heat transmission equipment of energy consumption has high input, maintain the feature that organic matter quality that hot gas desorption reclaims is purer; In addition, technological process of the present invention by the detection analyzing and processing to the data such as pressure, temperature, oxygen content of system, realizes whole-process automatic control by PLC control program system.
[accompanying drawing explanation]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the process schematic representation of embodiments of the invention.
In figure, each label is expressed as follows:
1, cold filter is shown; 2, main air blower; 3, Three-way butterfly valve;
A, the first absorbent charcoal adsorption tank; B, the second absorbent charcoal adsorption tank;
A1, A2, A3, A4, the first valve; B1, B2, B3, B4, the second valve;
4, the 3rd valve; 5, the 4th valve; 6, the 5th valve; 7, oil pump; 8, the 6th valve;
9, the 7th valve; 10, oxygen conten analyser; 11, condenser; 12, heater;
13, the 8th valve 14, the 9th valve; 15, circulation desorption blower fan;
16, two-stage condensation equipment; 17, shunt valve; 18, intermediate storage tank.
[detailed description of the invention]
Refer to shown in Fig. 1, embodiments of the invention are described in detail.
The present invention relates to a kind of charcoal absorption, N
2the technique of desorption recycling organic exhaust gas, described processing step is as follows:
Step 10, organic exhaust gas enter the cold filter of table by main air blower and carry out pretreatment, and organic exhaust gas after pretreatment is sent into the first absorbent charcoal adsorption tank again and adsorbed;
Step 20, when first absorbent charcoal adsorption tank absorption arrival one preset breakthrough point time, close and open corresponding valve, make the first absorbent charcoal adsorption tank enter the desorption system stage, the second absorbent charcoal adsorption tank enters the adsorption system stage;
Step 30, the N used in storage nitrogen tank
2gas in displacement desorption system, and the gas displaced is sent back in the cold filter of table, carry out adsorption treatment by the second absorbent charcoal adsorption tank; When online oxygen analyser detects that desorption system oxygen content is less than 0.5%, control desorption system pressure and close N after 4 ~ 10KPa
2supply, adds N in thermal desorption system
2, then circulate desorption, and the organic exhaust gas of desorption divides two parts, and a part flows through two-stage condensation equipment, and a part is through shunt valve, and then two parts gas and vapor permeation, sends back in the second absorbent charcoal adsorption tank by circulating fan; After flowing through the high-concentration organic waste gas condensation after the desorption of two-stage condensation equipment, enter purification system;
After step 40, desorption terminate, when the layer of charcoal temperature in the first absorbent charcoal adsorption tank drops to below the boiling temperature of VOCs gas, close and open corresponding valve, extraction fresh air carries out blowback and sweeps, and heats the boiling temperature of this fresh air to VOCs gas simultaneously; The gas purged out enters in the cold filter of table again, carries out adsorption treatment by the second absorbent charcoal adsorption tank;
After step 50, blowback sweep end, condensation cooling is carried out to intrasystem gas, the layer of charcoal in the first absorbent charcoal adsorption tank is lowered the temperature, so that next recycles finally by this condensed gas;
Described first absorbent charcoal adsorption tank and the above step of the second absorbent charcoal adsorption tank cycle alternation.
Concrete, in described step 30, the organic exhaust gas flowing through the desorption of two-stage condensation equipment first tentatively cools through two-stage condensation front equipment end heat exchanger, partial organic substances cooling fluid can be obtained, remaining gas enters further deep layer condensation in B grade condensing unit again, and cooling fluid and condensate recovery liquid enter purification system after intermediate storage tank; The desorption that circulates again is sent back in the first absorbent charcoal adsorption tank after being heated by heater after condensed remainder gas mixes with the organic exhaust gas of the desorption through shunt valve.
In described step 30, partial condensation air quantity (namely by the air quantity of two-stage condensation) is respectively 1:1 ~ 1:12 with the ratio of bypass air quantity (namely by the air quantity of shunt valve), desorption system temperature setting 80 ~ 350 DEG C.In bipolar condensing plant, gas divides two-way to walk: lead up to and first tentatively cool and then deep layer condensation (this is partial condensation); One tunnel without cooling condensation equipment directly by bipolar condensing plant (this is bypass).
In described step 30, when online oxygen conten analyser detects oxygen content > 2% in desorption system, give the alarm, desorption system stops heating and circulation desorption, open corresponding valve, again carry out nitrogen displacement in system, as oxygen content < 0.5%, reopen desorption manipulation.
Described blowback flyback time is 20% ~ 30% of desorption time; Described anti-purge air quantity is equal with desorption air quantity.Described technique is by PLC control program system whole-process automatic control.
Below in conjunction with specific embodiment, the present invention is further illustrated.
Embodiment
Emphasis consults Fig. 1, and processing step is as follows:
One, organic exhaust gas by main air blower 2 enter table cold filter 1 carry out pretreatment, be fed to the first absorbent charcoal adsorption tank A through pretreated organic exhaust gas and adsorb, open the first valve A2, purified gas is discharged by exhaust outlet; Second absorbent charcoal adsorption tank B is now in desorption and regeneration stage or stand-by phase, ensures that cleaning system can operate continuously, does not affect workshop and normally produce;
When arriving breakthrough point after two, the first absorbent charcoal adsorption tank A adsorbs a period of time, close first valve A1, A2, open second valve B1, B2, make the second absorbent charcoal adsorption tank B enter adsorption system, the first absorbent charcoal adsorption tank A enters desorption system.
Three, the first absorbent charcoal adsorption tank A enters desorption stage, opens the 3rd valve 4, the 4th valve 5, the 8th valve 13, the 9th valve 14, first valve A3, A4, uses N
2gas in exchange system, switch three-way valve 3 connects a, c end, and the gas displaced is sent into absorption front-end pipelines; When online oxygen conten analyser 10 detection system oxygen concentration is less than 0.5%, switch three-way valve 3 connects a, b end, ensure that desorption system pressure is close nitrogen gas supply the 3rd valve 4, the 4th valve 5 after 4 ~ 10kpa, close the 8th valve 13, start circulation desorption blower fan 15, open the 6th valve 8, the 7th valve 9, open oil pump 7, heater 12 is started working, simultaneously open cold condenser 16, regulate the air quantity of shunt valve 17, system carries out desorption condensation recovery.
High-concentration organic waste gas after desorb divides two parts, and a part flows through two-stage condensation equipment 16, and a part is through shunt valve 17, and then two parts gas and vapor permeation is got back in circulating-heating loop, sends the first absorbent charcoal adsorption tank A back to by circulating fan 15; The desorption gas flowing through two-stage condensation equipment 16 first tentatively cools through front end heat exchanger, partial organic substances cooling fluid can be obtained, remaining gas enters further deep layer condensation in B grade condensing unit again, and cooling fluid and condensate recovery liquid enter purification system after intermediate storage tank 18.Condensed remainder gas is again sent back in the first absorbent charcoal adsorption tank A by heater 12 desorption that circulates after mixing through the desorption gas of shunt valve 17.After reaching setting desorption time, close heater 12 by PLC control system, close the 9th valve 14, open the 8th valve 13, open cold condenser 11, first absorbent charcoal adsorption tank A carries out cooling processing simultaneously.The ratio of partial condensation air quantity and shunt valve air quantity is respectively 1:1, and system desorption temperature sets 90 DEG C.
The change of the oxygen content in online oxygen conten analyser 10 real-time monitoring system, and carry out control treatment by PLC system, when giving the alarm during oxygen content > 2% in desorption system, heater 12 stops heating, close circulating fan 15, open the 3rd valve 4, the 4th valve 5, first valve A2, carry out nitrogen displacement in system, as oxygen content < 0.5%, reopen desorption manipulation.
Four, when the first absorbent charcoal adsorption tank A layer of charcoal temperature reaches the following temperature of VOCs boiling point, open anti-purging system: close condenser 11, close the 8th valve 13, open the 5th valve 6, the 9th valve 14, connecting tee valve a, c hold, heater 12 (setting heter temperature is VOCs boiling temperature), system is carried out blowback and is swept.The gas purged out through triple valve a, c end send back to absorption front-end preprocessor system namely enter table cold filter 1 carry out pretreatment.Blowback flyback time is 20% of desorption time, and anti-purge air quantity is desorption air quantity.Purging terminates rear closedown heater 12 and the 9th valve 14, open cold condenser 11 and the 8th valve 13, and gas sends into the first absorbent charcoal adsorption tank A to reduce layer of charcoal temperature after passing through condenser 11, so that next recycles.
Five, step one, two, three, four automatic cycles carry out, two adsorption tanks alternating sorbent, desorption, cooling.
Six, the analyzing and processing that technological process of the present invention detects data by PLC control program system by the pressure to system, temperature, oxygen content etc. completes, and whole process controls automatically.
In the present invention, show cold filter and belong to front-end preprocessor system, it is mainly used in most suspended substances and granule foreign in filtration treatment organic exhaust gas, regulates EGT, is conducive to improving the absorption property of active carbon and extends service life of active carbon; The change of oxygen content concentration in oxygen conten analyser on-line real time monitoring system, ensures the safe operation of system; Circulation desorption blower fan is the power of gas circulating flow in desorption system, and nitrogen circulation can be allowed to use, and saves the consumption of nitrogen; Shunt valve, makes the hot gas after partial detachment directly send adsorption tanks from bypass back to by circulating fan without condensation, to reduce the heat exchange area of condenser, realizes recycling of heat, reduces energy consumption.
The present invention adopts partial condensation to reclaim and reverse purging process, not only effectively solve prior art problem, enormously simplify technique, reduce production cost, and the limitation that in overcoming desorption removal process in the past, high, the heat transmission equipment of energy consumption has high input, maintain the feature that organic matter quality that hot gas desorption reclaims is purer; In addition, technological process of the present invention by the detection analyzing and processing to the data such as pressure, temperature, oxygen content of system, realizes whole-process automatic control by PLC control program system.
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present invention and change, should be encompassed in scope that claim of the present invention protects.
Claims (6)
1. a charcoal absorption, N
2the technique of desorption recycling organic exhaust gas, is characterized in that: described processing step is as follows:
Step 10, organic exhaust gas enter the cold filter of table by main air blower and carry out pretreatment, and organic exhaust gas after pretreatment is sent into the first absorbent charcoal adsorption tank again and adsorbed;
Step 20, when adsorb arrival one preset breakthrough point time, close and open corresponding valve, make the first absorbent charcoal adsorption tank enter the desorption system stage, the second absorbent charcoal adsorption tank then enters the adsorption system stage;
Step 30, the N used in storage nitrogen tank
2replace the gas in the first absorbent charcoal adsorption tank, and the gas displaced is sent back in the cold filter of table, carry out adsorption treatment by the second absorbent charcoal adsorption tank; When online oxygen analyser detects that desorption system oxygen content is less than 0.5%, control desorption system pressure and close N after 4 ~ 10KPa
2supply, adds N in thermal desorption system pipeline
2oN cycle blower fan carries out circulation desorption, desorption organic exhaust gas out divides two parts, a part flows through two-stage condensation equipment, a part is through shunt valve, then two parts gas and vapor permeation, is sent in heater by circulating fan and heats, then reenter in the first absorbent charcoal adsorption tank and proceed desorption; After flowing through the high-concentration organic waste gas condensation after the desorption of two-stage condensation equipment, enter purification system;
After step 40, desorption terminate, when the layer of charcoal temperature in the first absorbent charcoal adsorption tank drops to below the boiling temperature of VOCs gas, close and open corresponding valve, extraction fresh air carries out blowback and sweeps, and heats the boiling temperature of this fresh air to VOCs gas simultaneously; The gas purged out enters in the cold filter of table again, carries out adsorption treatment by the second absorbent charcoal adsorption tank;
After step 50, blowback sweep end, condensation cooling is carried out to intrasystem gas, the layer of charcoal in the first absorbent charcoal adsorption tank is lowered the temperature, so that next recycles finally by this condensed gas;
Described first absorbent charcoal adsorption tank and the above step of the second absorbent charcoal adsorption tank cycle alternation.
2. a kind of charcoal absorption according to claim 1, N
2the technique of desorption recycling organic exhaust gas, it is characterized in that: in described step 30, the organic exhaust gas flowing through the desorption of two-stage condensation equipment first tentatively cools through two-stage condensation front equipment end heat exchanger, partial organic substances cooling fluid can be obtained, remaining gas enters further deep layer condensation in B grade condensing unit again, and cooling fluid and condensate recovery liquid enter purification system after intermediate storage tank; Condensed remainder gas is sent in the first absorbent charcoal adsorption tank the desorption that circulates after being heated by heater after mixing through the desorption organic exhaust gas of shunt valve again.
3. a kind of charcoal absorption according to claim 1 and 2, N
2the technique of desorption recycling organic exhaust gas, it is characterized in that: in described step 30, the ratio of partial condensation air quantity and bypass air quantity is respectively 1:1 ~ 1:12, desorption system temperature setting 80 ~ 350 DEG C.
4. a kind of charcoal absorption according to claim 1, N
2the technique of desorption recycling organic exhaust gas, it is characterized in that: in described step 30, when online oxygen conten analyser detects oxygen content > 2% in desorption system, give the alarm, desorption system stops heating and circulation desorption, opens corresponding valve, again carries out nitrogen displacement in system, as oxygen content < 0.5%, reopen desorption manipulation.
5. a kind of charcoal absorption according to claim 1, N
2the technique of desorption recycling organic exhaust gas, is characterized in that: described blowback flyback time is 20% ~ 30% of desorption time; Described anti-purge air quantity is equal with desorption air quantity.
6. a kind of charcoal absorption according to claim 1, N
2the technique of desorption recycling organic exhaust gas, is characterized in that: described technique is by PLC control program system whole-process automatic control.
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