A multi-mode system for treating volatile organic compounds

Abstract

The present invention provides a system for treating volatile organic compounds in multiple ways, which includes a condensation separation device, a combustion device, a pretreatment device, a concentration device and a waste heat recovery device, wherein the outlet of the pretreatment device is respectively connected to the inlet one of the valve and the condensation separation device, the gas outlet of the condensation separation device is respectively connected to the inlet of the adsorption chamber of the concentration device and the atmosphere, the gas outlet of the desorption chamber of the concentration device is connected to the inlet two of the valve, the outlet three of the valve is connected to the combustion device, the outlet four of the valve is connected to the waste heat recovery device, and the waste heat recovery device is connected to the gas inlet of the desorption chamber of the concentration device. The present invention integrates a pretreatment device, a condensation separation device, a concentration device, a combustion device and a waste heat recovery device, and can provide a variety of different solutions for different VOCs concentrations and types, and is suitable for the integrated treatment of different types of VOCs in factories.

Description

Technical Field

[0001] The invention belongs to the field of volatile organic compound treatment, in particular to a system for treating volatile organic compounds in multiple ways. Background Art

[0002] VOCs (volatile organic compounds) refer to organic compounds with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10Pa and volatility at 20°C. VOCs are usually divided into several categories, including non-methane hydrocarbons, oxygen-containing organic compounds, halogenated hydrocarbons, nitrogen-containing organic compounds, and sulfur-containing organic compounds. VOCs react under the action of light and heat to form ozone, which is itself an important component of atmospheric PM2.5. Some VOCs have been listed as carcinogens, such as vinyl chloride, benzene, polycyclic aromatic hydrocarbons, etc. A large part of VOCs has a noticeable odor, which will seriously affect people's quality of life.

[0003] At present, the main methods for treating VOCs include combustion, adsorption enrichment and reprocessing, and condensation recovery. The combustion method is mainly used for the treatment of high-concentration VOCs gases, which mainly uses the flammability of organic matter to pyrolyze it to achieve harmless gas emissions; adsorption enrichment and reprocessing technology can reduce the primary investment cost and operating costs through desorption and regeneration after adsorption enrichment, and provide the possibility for the resource utilization of waste gas VOCs; the condensation recovery method is to introduce organic waste gas into the condenser, and use the different vapor partial pressures of VOCs at different temperatures to gradually condense VOCs into liquid, and then recover them. The condensation method is suitable for treating high-concentration, small-flow organic waste gas. Existing factories can only treat one or a few VOCs gases of different concentrations and types, and the treatment plan is fixed, single, and not flexible enough.

[0004] Based on the above situation, the present invention provides a method for flexibly selecting different treatment schemes according to different concentrations and types of VOCs, which is suitable for the integrated treatment of different types of VOCs in factories. Summary of the invention

[0005] The present invention aims to provide a system for treating volatile organic compounds in multiple ways, which can treat VOCs differently according to their concentrations and types.

[0006] The technical solution of the present invention is:

[0007] A system for treating volatile organic compounds in multiple ways includes a condensation separation device and a combustion device. The system is special in that it also includes a pretreatment device, a concentration device and a waste heat recovery device. The outlet of the pretreatment device is connected to the first inlet of a valve, the outlet of the pretreatment device is connected to the condensation separation device, the gas outlet of the condensation separation device is connected to the inlet of an adsorption chamber of a concentration device and the atmosphere respectively, the adsorption chamber of the concentration device has an outlet connected to the atmosphere, the gas outlet of the desorption chamber of the concentration device is connected to the second inlet of the valve, the third outlet of the valve is connected to the combustion device, the fourth outlet of the valve is connected to the waste heat recovery device, the waste heat recovery device is connected to the gas inlet of the desorption chamber of the concentration device, the exhaust gas outlet of the combustion device is connected to the waste heat recovery device, the gas outlet of the waste heat recovery device is also connected to the condensation separation device, and the condensation separation device is also connected to the inlet of the waste heat recovery device.

[0008] Preferably, the concentrating device includes a shell and a partition plate which divides the space inside the shell into an adsorption chamber and a desorption chamber; the adsorption chamber has a gas inlet and a gas outlet, the gas inlet of the adsorption chamber is connected to the gas outlet of the first gas-liquid separator, the gas outlet of the second gas-liquid separator and the gas outlet of the fourth gas-liquid separator of the condensation separation device, and the gas outlet of the adsorption chamber is connected to the atmosphere; a lifting mechanism for lifting the regenerable activated carbon plate is also provided in the adsorption chamber; the desorption chamber is also provided with a gas inlet and a gas outlet, the gas inlet of the desorption chamber is connected to the outlet of the waste heat recovery device, the gas outlet of the desorption chamber is connected to the second inlet of the valve, and a descending mechanism for descending the regenerable activated carbon plate is provided in the desorption chamber; an upper baffle and a lower baffle movably connected to the partition plate are provided on the partition plate, and a first telescopic rod for pushing the regenerable activated carbon plate in the adsorption chamber to the desorption chamber via the upper baffle is provided on one side of the regenerable activated carbon plate at the adsorption position in the adsorption chamber; a second telescopic rod for pushing the regenerable activated carbon plate to the adsorption chamber via the lower baffle is provided on one side of the regenerable activated carbon plate at the desorption position in the desorption chamber.

[0009] Preferably, a pressure sensor is provided above and below the regenerable activated carbon plate at the adsorption position in the adsorption chamber, and a pressure sensor is provided above and below the regenerable activated carbon plate at the desorption position in the desorption chamber.

[0010] Preferably, the lifting mechanism includes transmission mechanisms respectively arranged on the front and rear sides of the adsorption chamber, each transmission mechanism includes a belt and two rotating shafts, one belt is sleeved on the two rotating shafts, a fixed bar is arranged on the belt at the same interval, and the motor drives one of the rotating shafts to rotate, so that the belt rotates; the fixed bars of the transmission mechanisms on the front and rear sides are aligned one by one on their respective horizontal planes, and the renewable activated carbon plate is placed on the fixed bars and moves upward synchronously;

[0011] The descending mechanism includes transmission mechanisms respectively arranged on the front and rear sides of the desorption chamber, each transmission mechanism includes a belt and two rotating shafts, one belt is sleeved on the two rotating shafts, a fixed bar is arranged on the belt at the same interval, and the motor drives one of the rotating shafts to rotate, so that the belt rotates; the fixed bars of the transmission mechanisms on the front and rear sides are aligned one by one on their respective horizontal planes, and the renewable activated carbon plates are placed on the fixed bars and move downward synchronously.

[0012] Preferably, the condensation separation device includes a first precooler, a first gas-liquid separator, a condenser in the refrigeration unit, a second gas-liquid separator, a cold recovery device, a third gas-liquid separator, a liquid nitrogen condenser, and a fourth gas-liquid separator which are connected in sequence, and the fourth gas-liquid separator is again connected to the adsorption chamber inlet of the concentration device through the cold recovery device; the condensation separation device also includes a second precooler and a fifth gas-liquid separator which are connected in series, and the second precooler and the fifth gas-liquid separator are also connected to the condenser in the refrigeration unit after being connected in series; the gas outlet of the first gas-liquid separator and the gas outlet of the second gas-liquid separator are also respectively connected to the adsorption chamber inlet of the concentration device; the gas outlets of the second gas-liquid separator and the cold recovery device are also directly connected to the atmosphere; the refrigerant outlet of the liquid nitrogen condenser is connected to the waste heat recovery device.

[0013] Preferably, the waste heat recovery device includes a first heat recovery device, a second heat recovery device and a gas storage heater which are connected in sequence, and the outlet of the gas storage heater is connected to the gas inlet of the desorption chamber of the concentration device; the first heat recovery device is connected to the outlet four of the valve, the second heat recovery device is connected to the exhaust gas outlet of the combustion device, and the second heat recovery device is also connected to the atmosphere; the gas whose heat is recovered by the first heat recovery device is discharged into the gas storage recovery tank for storage or is connected to the condenser in the refrigeration unit through the second precooler and the fifth gas-liquid separator in sequence.

[0014] Preferably, the combustion device comprises a three-chamber regenerative burner having three regenerative chambers and one oxidation chamber, wherein the regenerative chambers are provided with ceramic spherical regenerative bodies, and the oxidation chambers are provided with auxiliary burners.

[0015] Preferably, the surface of the ceramic spherical heat storage body is provided with grooves and / or penetrating channels.

[0016] Preferably, the pretreatment device includes a three-stage filter, a pressure buffer tank, and a flow control valve connected in series.

[0017] Preferably, the liquid outlets of the first gas-liquid separator, the second gas-liquid separator, the third gas-liquid separator, the fourth gas-liquid separator, and the fifth gas-liquid separator are respectively connected to a liquid storage recovery tank, and the liquid storage recovery tank has four partitions: the first gas-liquid separator and the fifth gas-liquid separator are both connected to the first partition of the liquid storage recovery tank, and the second gas-liquid separator, the third gas-liquid separator, and the fourth gas-liquid separator are respectively connected to the other three partitions of the liquid storage recovery tank one by one.

[0018] The advantages of the present invention are: (1) the present invention integrates a pretreatment device, a condensation separation device, a concentration device, a combustion device and a waste heat recovery device, and can provide five different solutions for different VOCs concentrations and types, which is suitable for the integrated treatment of different types of VOCs in factories;

[0019] (2) The concentration device automatically determines the saturation of the renewable activated carbon plate through a sensor, and can quickly replace the renewable activated carbon plate. Multiple renewable activated carbon plate positions are set in the adsorption chamber to cool the renewable activated carbon plate;

[0020] (3) The condensation separation device adopts graded condensation recovery, and can select different condensation points for recovery according to the boiling point of the substance to be recovered, thus reducing excessive use of energy;

[0021] (4) Before the VOCs in this scheme flow into the concentration device, they have been cooled by the first precooler or the condensation separation device, and the temperature is reduced, which is conducive to the adsorption of VOCs by the renewable activated carbon plate;

[0022] (5) The surface of the ceramic spherical heat storage body is provided with grooves and / or through-channels to increase the surface area for heat exchange and improve the exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Schematic diagram of the overall process of the present invention.

[0024] Figure 2 : Cross-section of a three-chamber regenerative burner.

[0025] Figure 3 : A simplified cross-sectional view of a concentration device (the lifting and lowering mechanisms are not shown).

[0026] Figure 4 :Schematic diagram of liquid storage recovery tank partition.

[0027] Figure 5 : Figure 3 Right view of the middle lifting mechanism.

[0028] Figure 6 : Control principle diagram of the concentration device.

[0029] Among them: 1. three-stage filter; 2. pressure buffer tank; 3. flow control valve; 4. first precooler; 5. first gas-liquid separator; 6. condenser in refrigeration unit; 7. liquid storage recovery tank; 8. second gas-liquid separator; 9. cold recovery device; 10. third gas-liquid separator; 11. nitrogen recovery tank; 12. liquid nitrogen condenser; 13. liquid nitrogen storage tank; 14. fourth gas-liquid separator; 15. concentration device; 16. combustion device; 17. first regenerator; 18. second regenerator; 19. gas storage heater; 20. gas storage recovery tank; 21. second precooler; 22. valve; 23. Rotating shaft; 24. Belt; 29. ​​Fan; 30. Renewable activated carbon plate; 31. Fixing bar; 32. Upper baffle; 33. Lower baffle; 34. Ceramic spherical heat storage body; 35. Auxiliary burner; 36. Oxidation chamber; 37. Heat storage chamber; 38. Pressure sensor; 39. First partition; 40. Second partition; 41. Third partition; 42. Fourth partition; 431. First telescopic rod; 432. Second telescopic rod; 44. Fifth gas-liquid separator; 45. Adsorption chamber; 46. Partition plate; 47. Shell; 48. Desorption chamber; 49. Gas quality detection sensor. DETAILED DESCRIPTION

[0030] like Figure 1 The present invention includes a pretreatment device, a condensation separation device, a concentration device 15, a combustion device 16 and a waste heat recovery device. The outlet of the pretreatment device is connected to the inlet 1 of the valve 22, the outlet of the pretreatment device is connected to the condensation separation device, the gas outlet of the condensation separation device is connected to the inlet of the adsorption chamber 45 of the concentration device 15 and the atmosphere respectively, the adsorption chamber 45 of the concentration device 15 has an outlet connected to the atmosphere, the gas outlet of the desorption chamber 48 of the concentration device 15 is connected to the inlet 2 of the valve 22, the outlet 3 of the valve 22 is connected to the combustion device 16, the outlet 4 of the valve 22 is connected to the waste heat recovery device, the waste heat recovery device is connected to the gas inlet of the desorption chamber 48 of the concentration device 15, the exhaust gas outlet of the combustion device 16 is connected to the waste heat recovery device, the gas outlet of the waste heat recovery device is also connected to the condensation separation device, and the condensation separation device is also connected to the inlet of the waste heat recovery device.

[0031] Specifically, the condensation separation device includes a first precooler 4, a first gas-liquid separator 5, a condenser 6 in the refrigeration unit, a second gas-liquid separator 8, a cold recovery device 9, a third gas-liquid separator 10, a liquid nitrogen condenser 12, and a fourth gas-liquid separator 14, which are connected in sequence. The fourth gas-liquid separator 14 is connected to the inlet of the adsorption chamber 45 of the concentration device 15 again through the cold recovery device 9; the condensation separation device also includes a second precooler 21 and a fifth gas-liquid separator 44 connected in series, and the second precooler 21 and the fifth gas-liquid separator 44 are also connected in series with the refrigeration unit. The condenser 6 is connected; the gas outlet of the first gas-liquid separator 5 and the gas outlet of the second gas-liquid separator 8 are respectively connected to the entrance of the adsorption chamber 45 of the concentration device 15; the refrigerant inlet of the liquid nitrogen condenser 12 is connected to the liquid nitrogen storage tank 13, and the refrigerant outlet of the liquid nitrogen condenser 12 is connected to the first regenerator 17 of the waste heat recovery device through the nitrogen recovery tank 11, and the gas outlets of the second gas-liquid separator 8 and the fourth gas-liquid separator 14 are also directly connected to the atmosphere respectively; the function of the cold recovery device 9 is to recover the cold of the gas passing through the liquid nitrogen condenser 12. The condensation separation device adopts graded condensation recovery, and different condensation points can be selected for recovery according to the boiling point of the material to be recovered, thereby reducing excessive use of energy.

[0032] Specifically, the first precooler 4, the second precooler 21, and the condenser 6 in the refrigeration unit are all shell and tube heat exchangers; the liquid nitrogen condenser 12 is a plate heat exchanger; the cold recovery device 9, the first regenerator 17, and the second regenerator 18 are all plate-fin cross-flow heat exchangers. The first precooler 4 and the second precooler 21 both use deep well water to cool the VOCs gas, and the liquid nitrogen becomes gas after passing through the liquid nitrogen condenser 12 and is temporarily stored in the nitrogen recovery tank 11.

[0033] There are two routes for condensation separation. The first route is for the airflow passing through the precooler (the first precooler 4 or the second precooler 21), the first gas-liquid separator 5, the condenser 6 in the refrigeration unit, the second gas-liquid separator 8, and enters the concentration device 15 after condensation is completed; the second route is for the airflow passing through the precooler (the first precooler 4 or the second precooler 21), the first gas-liquid separator 5, the condenser 6 in the refrigeration unit, the second gas-liquid separator 8, the cold recovery device 9, the third gas-liquid separator 10, the liquid nitrogen condenser 12, the fourth gas-liquid separator 14, the cold recovery device 9, and enters the concentration device 15 after condensation is completed. The difference between the two routes is the different degree of condensation, which can be selected as needed.

[0034] like Figure 3The concentration device 15 includes a shell 47 and a partition plate 46 that divides the space in the shell 47 into an adsorption chamber 45 and a desorption chamber 48. The adsorption chamber 45 has a gas inlet and a gas outlet. The gas inlet of the adsorption chamber 45 is connected to the gas outlet of the first gas-liquid separator 5, the gas outlet of the second gas-liquid separator 8, and the gas outlet of the fourth gas-liquid separator 14 of the condensation separation device, and the gas outlet of the adsorption chamber 45 is connected to the atmosphere; the adsorption chamber 45 is also provided with a lifting mechanism for lifting the regenerable activated carbon plate 30, and the desorption chamber 48 is also provided with a gas inlet and a gas outlet. The gas inlet of the desorption chamber 48 is connected to the air or nitrogen outlet of the waste heat recovery device, and the gas outlet of the desorption chamber 48 is connected to the inlet 2 of the valve 22. The desorption chamber 48 is provided with a descending mechanism for descending the regenerable activated carbon plate 30. Structure; an upper baffle 32 and a lower baffle 33 movably connected to the partition plate 46 are provided on the partition plate 46, a pressure sensor 38 is respectively provided above and below the regenerable activated carbon plate 30 at the adsorption position in the adsorption chamber 45, and a pressure sensor 38 is respectively provided above and below the regenerable activated carbon plate 30 at the desorption position in the desorption chamber 48, which can detect the pressure status in real time; a first telescopic rod 431 for pushing the regenerable activated carbon plate 30 in the adsorption chamber 45 to the desorption chamber 48 through the upper baffle 32 is provided on one side of the regenerable activated carbon plate 30 at the adsorption position in the adsorption chamber 45; a second telescopic rod 432 for pushing the regenerable activated carbon plate 30 to the adsorption chamber 45 through the lower baffle 33 is provided on one side of the regenerable activated carbon plate 30 at the desorption position in the desorption chamber 48. Preferably, the adsorption chamber 45 and the desorption chamber 48 are respectively provided with a fan 29; during adsorption and desorption, the upper baffle 32 and the lower baffle 33 are closed to keep the adsorption chamber 45 and the desorption chamber 48 not connected.

[0035] The regenerated activated carbon plate 30 of the concentrator 15 is a rectangular plate made of recyclable activated carbon with strong adsorption capacity. Under high temperature, the organic waste gas adsorbed by the waste activated carbon is quickly analyzed and desorbed to form a new active surface. The regenerated activated carbon has adsorption capacity again and is recycled in the adsorption chamber 45.

[0036] The lifting mechanism and the lowering mechanism can respectively adopt existing structures in the prior art. Preferably, the lifting mechanism and the lowering mechanism can adopt but not limited to the following structures: Figure 3 and Figure 5 The lifting mechanism includes two parts respectively arranged on the front and rear sides of the adsorption chamber 45 ( Figure 3The transmission mechanism comprises a belt 24 and two rotating shafts 23, one belt 24 is sleeved on the two rotating shafts 23, a fixed bar 31 is arranged on the belt 24 at the same distance, and the motor drives one of the rotating shafts to rotate, so that the belt 24 rotates; the fixed bars 31 of the transmission mechanism on the front and rear sides are aligned one by one on their respective horizontal planes, and three renewable activated carbon plates 30 are placed on the three-layer fixed bars 31, and the renewable activated carbon plates 30 can move upward synchronously. The descending mechanism comprises transmission mechanisms respectively arranged on the front and rear sides of the desorption chamber 48, and the fixed bars 31 are also arranged on the belt 24 of the transmission mechanism, and the three renewable activated carbon plates 30 are placed on the three-layer fixed bars 31 and move downward synchronously.

[0037] like Figure 6 The working principle of the concentrator 15 is as follows: the pressure sensors 38 installed on and below the topmost regenerable activated carbon plate 30 in the adsorption chamber 45 automatically monitor and send the values ​​to the controller of the concentrator 15, and the controller monitors the pressure difference changes between the inlet and outlet. When the regenerable activated carbon plate 30 is saturated, the gas flow is blocked, resulting in an increase in the pressure difference. When it exceeds the preset limit, the controller of the concentrator 15 preliminarily determines that the regenerable activated carbon plate 30 may be close to saturation, sends a signal to control the upper baffle 32 to open, and the first telescopic rod 431 extends to provide lateral thrust, pushing the topmost regenerable activated carbon plate 30 from the adsorption chamber 45 to the desorption chamber 48, and the fixing bar 31 provides support. Then the controller of the concentrator 15 controls the motor of the lifting mechanism to operate, and the belt 24 of the adsorption chamber 45 moves to move the next layer of the regenerable activated carbon plate 30 to a position flush with the upper baffle 32. The controller of the concentrator 15 controls the motor of the descending mechanism to operate, and the regenerable activated carbon plate 30 in the desorption chamber 48 will move down with the belt 24 to desorb. During desorption, the pressure sensor 38 automatically monitors and compares the pressure difference at that time with the pressure difference after desorption. When the two are close, desorption is completed. After desorption is completed, a signal is sent to control the lower baffle 33 to open, and the second telescopic rod 432 is extended to provide lateral thrust to push the regenerable activated carbon plate 30 after desorption from the desorption chamber 48 to the adsorption chamber 45, so that desorption is completed. The regenerable activated carbon plate 30 is cooled at the bottom, saving the cooling step.

[0038] like Figure 2 The combustion device 16 includes a three-chamber regenerative burner, which has three regenerative chambers 37 and an oxidation chamber 36. A ceramic spherical regenerative body 34 is arranged in the regenerative chamber 37, and an auxiliary burner 35 is arranged in the oxidation chamber 36. Preferably, the surface of the ceramic spherical regenerative body 34 is provided with grooves and / or through channels to increase the surface area of ​​heat exchange and improve the exchange efficiency.

[0039] The working process of the combustion device 16 is:

[0040] 1. VOCs enter the No. 1 regenerator 37. The ceramic spherical regenerator 34 in the No. 1 regenerator 37 stores the heat of the previous cycle. The ceramic spherical regenerator 34 releases heat to cool down, while the VOCs absorb heat to increase the temperature. After leaving the regenerator 37, the VOCs enter the oxidation chamber 36 at a higher temperature. The VOCs are heated by the auxiliary burner 35 in the oxidation chamber 36 to the set oxidation temperature, so that the VOCs components therein are decomposed into carbon dioxide and water.

[0041] Second: VOCs are burned in the oxidation chamber 36, and become purified high-temperature gas, which then leaves the oxidation chamber 36 and enters the No. 2 regenerator 37. The No. 2 regenerator 37 has been cooled in the previous cycle. The high-temperature gas releases heat and cools down, passes through the second regenerator 18, and then is discharged into the atmosphere. The ceramic spherical regenerator 34 in the No. 2 regenerator 37 absorbs a large amount of heat and heats up, which is used to heat VOCs in the next cycle. At the same time, a small stream of purified gas is introduced to clean the No. 3 regenerator 37, and the remaining VOC waste gas in the No. 3 regenerator 37 is cleaned and blown into the oxidation chamber 36, otherwise it will be discharged into the atmosphere in the next cycle.

[0042] Three: After the cycle is completed, the next cycle begins, VOCs enter from the No. 2 heat storage chamber 37, and are discharged from the No. 3 heat storage chamber 37. After the switch, the No. 1 heat storage chamber 37 is cleaned. This is repeated alternately.

[0043] The waste heat recovery device includes a first heat recovery device 17, a second heat recovery device 18 and a gas storage heater 19 which are connected in sequence, and the outlet of the gas storage heater 19 is connected to the gas inlet of the desorption chamber 48 of the concentration device 15; the first heat recovery device 17 is connected to the outlet four of the valve 22, and the first heat recovery device 17 recovers the heat of the gas discharged from the desorption chamber 48, and the second heat recovery device 18 is connected to the exhaust gas outlet of the combustion device 16, and the second heat recovery device 18 recovers the heat in the combustion exhaust gas in the oxidation chamber 36 of the combustion device 16. The second heat recovery device 18 is also connected to the atmosphere, and the combustion exhaust gas of the combustion device 16 exchanges heat with the second heat recovery device 18 and is discharged into the atmosphere; the gas whose heat is recovered by the first heat recovery device 17 is discharged into the gas storage recovery tank 20 for storage or is connected to the condenser 6 in the refrigeration unit through the second precooler 21 and the fifth gas-liquid separator 44 in sequence.

[0044] The waste heat recovery device can select nitrogen or air to pass through the first regenerator 17 and the second regenerator 18 and then reach the gas storage heater 19. If the temperature of the nitrogen or air is not enough, the heating function in the gas storage heater 19 is started for heating, and then it is sent to the desorption chamber 48 for desorption. For the subsequent condensation recovery or entering the gas storage recovery tank 20, hot nitrogen is used for desorption, and for the subsequent entry into the combustion device 16, hot air is used for desorption. Nitrogen is an inert gas and will not react with VOCs or activated carbon, so it can be safely used in the desorption process. Hot nitrogen desorption can not only better desorb VOCs from activated carbon, but also regenerate activated carbon so that it can be used again in the adsorption process, extending the service life of the adsorbent and reducing operating costs. Preferably, when the second regenerator 18 heats the air, the air can be transported to the oxidation chamber 36 of the combustion device 16 to improve combustion efficiency.

[0045] The pretreatment device of the present invention comprises a three-stage filter 1, a pressure buffer tank 2, and a flow control valve 3 connected in series. Other pretreatment equipment and combinations thereof may also be used according to actual conditions. The output end of the pretreatment device is respectively connected to the first precooler 4 and the valve 22 of the condensation separation device.

[0046] Preferably, since the liquid substances recovered by condensation through the gas-liquid separators are condensed under different temperature conditions and the types of substances contained therein are different, they are stored separately to facilitate subsequent separation and purification. The liquid outlets of the first gas-liquid separator 5, the second gas-liquid separator 8, the third gas-liquid separator 10, the fourth gas-liquid separator 14, and the fifth gas-liquid separator 44 are respectively connected to the liquid storage recovery tank 7, and the liquid storage recovery tank 7 has four partitions: the first gas-liquid separator 5 and the fifth gas-liquid separator 44 are connected to the first partition 39 of the liquid storage recovery tank 7, and the second gas-liquid separator 8, the third gas-liquid separator 10, and the fourth gas-liquid separator 14 are respectively connected to the other three partitions of the liquid storage recovery tank 7. That is, the liquid separated by the first gas-liquid separator 5 and the fifth gas-liquid separator 44 enters the first partition 39; the liquid separated by the second gas-liquid separator 8 enters the second partition 39; Figure 4 The liquid separated by the third gas-liquid separator 10 enters the second partition 40; Figure 4 The liquid separated by the fourth gas-liquid separator 14 enters the third partition 41; Figure 4 The fourth division 42.

[0047] Preferably, the present invention further comprises a pretreatment device, which comprises a three-stage filter 1, a pressure buffer tank 2 and a flow control valve 3 connected in series. The outlet of the pretreatment device is connected to the inlet of the valve 22, and the outlet of the pretreatment device is connected to the condensation separation device.

[0048] The present invention can provide 5 gas treatment solutions with different VOCs concentrations and types:

[0049] The first solution: VOC concentration is low and needs to be condensed and recovered. VOCs pass through the three-stage filter 1, the pressure buffer tank 2, the flow control valve 3, the first precooler 4, the first gas-liquid separator 5, and then enter the concentration device 15. After adsorption purification, they are directly discharged into the atmosphere. After the regenerated activated carbon plate 30 attached with VOCs is desorbed, it is discharged from the gas outlet of the desorption chamber 48 through the valve 22 into the first regenerator 17, and the heat is transferred to the air or nitrogen. The cooled VOCs can enter the second precooler 21, the fifth gas-liquid separator 44, and then condensed and recovered: select the condensation route as needed. If the concentration test of the gas quality detection sensor 49 is qualified, it is directly discharged into the atmosphere. If the concentration test is unqualified, the following tail gas treatment is performed: it is combined with the VOCs from the first gas-liquid separator 5, and then enters the concentration device 15 together, repeating the above process after entering the concentration device 15.

[0050] In this solution, the VOCs have been condensed and recovered before flowing into the concentration device 15 , and the temperature has been reduced, which is beneficial to the adsorption of VOCs by the regenerable activated carbon plate 30 .

[0051] The second solution: VOC concentration is high and needs to be condensed and recovered. VOCs pass through the three-stage filter 1, the pressure buffer tank 2, the flow control valve 3, the first precooler 4, the first gas-liquid separator 5, and then are condensed and recovered for liquid storage: the condensation route is selected as needed. If the concentration test of the gas quality detection sensor 49 is qualified, it is directly discharged into the atmosphere. If the concentration test is unqualified, the tail gas is treated as follows: then enter the concentration device 15, after adsorption and desorption, enter the regenerative burner through the valve 22 for treatment or enter the first regenerator 17, and finally enter the gas storage recovery tank 20 for gaseous storage.

[0052] In this solution, the VOCs have been condensed and recovered before flowing into the concentration device 15 , and the temperature has been reduced, which is beneficial to the adsorption of VOCs by the regenerable activated carbon plate 30 .

[0053] The third option: VOC concentration is low and does not need to be recycled. VOCs pass through the three-stage filter 1, the pressure buffer tank 2, the flow control valve 3, the first precooler 4, the first gas-liquid separator 5, and then enter the concentration device 15. After adsorption and desorption, they pass through the valve 22 and enter the three-chamber regenerative burner. After heating, the dotted line represents that the air enters the three-chamber regenerative burner. The oxidized exhaust gas passes through the second regenerator 18, transfers heat to air or nitrogen, and the exhaust gas meets the emission standards and is finally discharged into the atmosphere.

[0054] In this solution, the VOCs have been cooled by the first precooler 4 before flowing into the concentration device 15 , and the temperature is reduced, which is beneficial to the adsorption of VOCs by the regenerable activated carbon plate 30 .

[0055] The fourth solution: VOC concentration is high and does not need to be recycled. VOCs pass through the three-stage filter 1, the pressure buffer tank 2, the flow control valve 3, and then enter the heat storage chamber 37 through the valve 22 for combustion. After heating and oxidation, the exhaust gas passes through the second regenerator 18 to transfer heat to air or nitrogen. The exhaust gas meets the emission standards and is finally discharged into the atmosphere.

[0056] The fifth solution: recover in gaseous state without condensation. VOCs pass through the three-stage filter 1, the pressure buffer tank 2, the flow control valve 3, the first precooler 4, the first gas-liquid separator 5, and then enter the concentration device 15. After adsorption and desorption, they pass through the valve 22 and enter the first regenerator 17 to transfer heat to air or nitrogen. After cooling, the VOCs can enter the gas storage recovery tank 20 for gaseous storage.

[0057] In this solution, the VOCs have been cooled by the first precooler 4 before flowing into the concentration device 15 , and the temperature is reduced, which is beneficial to the adsorption of VOCs by the regenerable activated carbon plate 30 .

Claims

1. A system for treating volatile organic compounds in multiple ways, comprising a condensation separation device and a combustion device (16), characterized in that: The system also comprises a pretreatment device, a concentration device (15) and a waste heat recovery device, wherein the outlet of the pretreatment device is connected to the inlet 1 of the valve (22), the outlet of the pretreatment device is connected to the condensation separation device, the gas outlet of the condensation separation device is connected to the inlet of the adsorption chamber (45) of the concentration device (15) and the atmosphere respectively, the adsorption chamber (45) of the concentration device (15) has an outlet connected to the atmosphere, the gas outlet of the desorption chamber (48) of the concentration device (15) is connected to the inlet 2 of the valve (22), the outlet 3 of the valve (22) is connected to the combustion device (16), the outlet 4 of the valve (22) is connected to the waste heat recovery device, the waste heat recovery device is connected to the gas inlet of the desorption chamber (48) of the concentration device (15), the exhaust gas outlet of the combustion device (16) is connected to the waste heat recovery device, the gas outlet of the waste heat recovery device is also connected to the condensation separation device, and the condensation separation device is also connected to the inlet of the waste heat recovery device.

2. The multi-mode system for treating volatile organic compounds according to claim 1, characterized in that: The concentration device (15) comprises a shell (47) and a partition plate (46) for dividing the space inside the shell (47) into an adsorption chamber (45) and a desorption chamber (48); the adsorption chamber (45) has a gas inlet and a gas outlet, the gas inlet of the adsorption chamber (45) is connected to the gas outlet of the first gas-liquid separator (5), the gas outlet of the second gas-liquid separator (8), and the gas outlet of the fourth gas-liquid separator (14) of the condensation separation device, and the gas outlet of the adsorption chamber (45) is connected to the atmosphere; a lifting mechanism for lifting the regenerable activated carbon plate (30) is also provided in the adsorption chamber (45); the desorption chamber (48) is also provided with a gas inlet and a gas outlet, the gas inlet of the desorption chamber (48) is connected to the outlet of the waste heat recovery device, and the desorption chamber (48) The gas outlet is connected to the second inlet of the valve (22); a descending mechanism for descending the regenerable activated carbon plate (30) is provided in the desorption chamber (48); an upper baffle (32) and a lower baffle (33) movably connected to the partition plate (46) are provided on the partition plate (46); a first telescopic rod (431) for pushing the regenerable activated carbon plate (30) in the adsorption chamber (45) through the upper baffle (32) into the desorption chamber (48) is provided on one side of the regenerable activated carbon plate (30) at the adsorption position in the adsorption chamber (45); and a second telescopic rod (432) for pushing the regenerable activated carbon plate (30) through the lower baffle (33) into the adsorption chamber (45) is provided on one side of the regenerable activated carbon plate (30) at the desorption position in the desorption chamber (48).

3. The multi-mode system for treating volatile organic compounds according to claim 2, characterized in that: A pressure sensor (38) is provided above and below the regenerable activated carbon plate (30) at the adsorption position in the adsorption chamber (45), and a pressure sensor (38) is provided above and below the regenerable activated carbon plate (30) at the desorption position in the desorption chamber (48).

4. The multi-mode system for treating volatile organic compounds according to claim 3, characterized in that: The lifting mechanism comprises transmission mechanisms respectively arranged on the front and rear sides of the adsorption chamber (45), each transmission mechanism comprising a belt (24) and two rotating shafts (23), one belt (24) being sleeved on the two rotating shafts (23), a fixing bar (31) being arranged on the belt (24) at equal intervals, and a motor driving one of the rotating shafts (23) to rotate, thereby rotating the belt (24); the fixing bars (31) of the transmission mechanisms on the front and rear sides are aligned one by one on their respective horizontal planes, and the regenerable activated carbon plates (30) are placed on the fixing bars (31) and move upward synchronously; The descending mechanism comprises transmission mechanisms respectively arranged on the front and rear sides of the desorption chamber (48), each transmission mechanism comprising a belt (24) and two rotating shafts (23), one belt (24) being sleeved on the two rotating shafts (23), a fixing bar (31) being arranged on the belt (24) at equal intervals, and a motor driving one of the rotating shafts (23) to rotate, thereby rotating the belt (24); the fixing bars (31) of the transmission mechanisms on the front and rear sides are aligned one by one on their respective horizontal planes, and the renewable activated carbon plates (30) are placed on the fixing bars (31) and move downward synchronously.

5. The multi-mode system for treating volatile organic compounds according to claim 4, characterized in that: The condensation separation device comprises a first precooler (4), a first gas-liquid separator (5), a condenser (6) in a refrigeration unit, a second gas-liquid separator (8), a cold recovery device (9), a third gas-liquid separator (10), a liquid nitrogen condenser (12), and a fourth gas-liquid separator (14) which are connected in sequence, and the fourth gas-liquid separator (14) is connected to the inlet of the adsorption chamber (45) of the concentration device (15) again through the cold recovery device (9); the condensation separation device also comprises a second precooler (21) and a The fifth gas-liquid separator (44), the second precooler (21) and the fifth gas-liquid separator (44) are connected in series and are also connected to the condenser (6) in the refrigeration unit; the gas outlet of the first gas-liquid separator (5) and the gas outlet of the second gas-liquid separator (8) are also respectively connected to the inlet of the adsorption chamber (45) of the concentration device (15); the gas outlets of the second gas-liquid separator (8) and the cold recovery device (9) are also directly connected to the atmosphere; and the refrigerant outlet of the liquid nitrogen condenser (12) is connected to the waste heat recovery device.

6. The multi-mode system for treating volatile organic compounds according to claim 5, characterized in that: The waste heat recovery device comprises a first heat recovery device (17), a second heat recovery device (18) and a gas storage heater (19) which are connected in sequence, wherein the outlet of the gas storage heater (19) is connected to the gas inlet of the desorption chamber (48) of the concentration device (15); the first heat recovery device (17) is connected to the outlet 4 of the valve (22), the second heat recovery device (18) is connected to the exhaust gas outlet of the combustion device (16), and the second heat recovery device (18) is also connected to the atmosphere; the gas from which heat is recovered by the first heat recovery device (17) is discharged into the gas storage recovery tank (20) for storage or is connected to the condenser (6) in the refrigeration unit through the second precooler (21) and the fifth gas-liquid separator (44) in sequence.

7. The multi-mode system for treating volatile organic compounds according to claim 6, characterized in that: The combustion device (16) comprises a three-chamber regenerative burner having three regenerative chambers (37) and an oxidation chamber (36). A ceramic spherical regenerative body (34) is arranged in the regenerative chamber (37), and an auxiliary burner (35) is arranged in the oxidation chamber (36).

8. The multi-mode system for treating volatile organic compounds according to claim 7, characterized in that: The surface of the ceramic spherical heat storage body (34) is provided with grooves and / or penetrating channels.

9. The multi-mode system for treating volatile organic compounds according to claim 8, characterized in that: The pretreatment device comprises a three-stage filter (1), a pressure buffer tank (2), and a flow control valve (3) which are sequentially connected in series.

10. The multi-mode system for treating volatile organic compounds according to claim 9, characterized in that: The liquid outlets of the first gas-liquid separator (5), the second gas-liquid separator (8), the third gas-liquid separator (10), the fourth gas-liquid separator (14), and the fifth gas-liquid separator (44) are respectively connected to the liquid storage recovery tank (7), and the liquid storage recovery tank (7) has four partitions: the first gas-liquid separator (5) and the fifth gas-liquid separator (44) are both connected to the first partition (39) of the liquid storage recovery tank (7), and the second gas-liquid separator (8), the third gas-liquid separator (10), and the fourth gas-liquid separator (14) are respectively connected to the other three partitions of the liquid storage recovery tank (7) in a one-to-one correspondence.

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