TWM526924U - Exhaust gas purifying equipment - Google Patents

Description

Exhaust gas purification equipment

The present invention relates to a purification device, and more particularly to an exhaust gas purification device.

Referring to Fig. 1, a new high-performance organic solvent recovery device is disclosed in Taiwan Patent No. M373772. The organic solvent recovery device 1 is configured to recover an organic solvent in the exhaust gas to be treated, and includes a pre-cooler 11 for cooling the exhaust gas to be treated, and a hydrophilic organic solvent for absorbing the waste gas to be treated. a treated scrubber 12 for treating exhaust gas, a temperature and humidity control unit 13 for adjusting the temperature and humidity of the treated exhaust gas, and an activated carbon for adsorbing the lipophilic organic solvent in the treated exhaust gas Attached to unit 14. When the activated carbon adsorption/desorption unit 14 adsorbs the lipophilic organic solvent to a saturated state, the activated carbon adsorption/desorption unit 14 is subjected to a desorption treatment to return to an unsaturated state.

The desorption treatment heats the activated carbon adsorption/desorption unit 14 by water vapor to desorb the lipophilic organic solvent from the activated carbon. The water vapor and the lipophilic organic solvent are discharged from the activated carbon adsorption and desorption unit 14, and are treated by a condenser (not shown) and a separator (not shown) to obtain a liquid lipophilic organic solvent. And wastewater formed from the water vapor. When the wastewater meets the wastewater discharge standard, it is discharged into the natural environment. If it does not meet the wastewater discharge standard, it is transported to the wastewater treatment plant for treatment.

In the conventional high-performance organic solvent recovery device, the organic solvent can be efficiently recovered. However, when the activated carbon adsorption/desorption unit 14 performs the desorption treatment, waste water is continuously generated, and the waste water is continuously discharged into the natural environment. Although the wastewater may eventually meet the wastewater discharge standards, it will still cause damage to the natural environment.

Therefore, the object of the present invention is to provide an exhaust gas purifying apparatus which can reduce the amount of waste water discharged and can be reused.

Therefore, the novel exhaust gas purifying apparatus is suitable for purifying a waste gas to be treated containing a hydrophilic organic substance and a lipophilic organic substance, and is suitable for connecting a water vapor supply device for supplying water vapor. The exhaust gas purifying apparatus comprises a washing device, a suction and desorption device connected to the washing device, a condensation device connected to the suction and desorption device, a separation device connected to the condensation device, and a connection device and a washing device Conveying device.

The washing apparatus includes a first outer casing defining a first accommodating space and a washing unit. The first accommodating space has an air inlet and an air outlet for the exhaust gas to be treated to enter. The washing unit is disposed in the first accommodating space of the first outer casing for spraying and contacting the washing liquid of the exhaust gas to be treated. The washing liquid can recover the hydrophilic organic matter in the exhaust gas to be treated entering from the air inlet, so that the exhaust gas to be treated forms the treated exhaust gas and is discharged from the air outlet, and the washing liquid forms a waste liquid. The suction and detachment device comprises a second outer casing defining a second accommodating space and an adsorbent disposed in the second accommodating space. The second accommodating space has an air inlet unit and an exhaust unit. The suction and desorption device can be operated in an adsorption mode and a desorption mode. In the adsorption mode, the adsorbent recovers the lipophilic organic matter in the treated exhaust gas entering from the gas inlet unit, so that the treated exhaust gas forms a purge gas and is discharged from the exhaust port unit, and the adsorbent An adsorbent having the lipophilic organic substance is formed. In the desorption mode, the adsorbent with the lipophilic organic substance is activated by the water vapor entering from the gas inlet unit, and the lipophilic organic substance is detached, and the water vapor and the lipophilic organic substance are discharged from the row. The port unit is discharged. The condensing device is configured to condense the water vapor discharged from the suction and desorption device with the lipophilic organic matter to form wastewater and liquid lipophilic organic matter. The separation device is used to separate the wastewater and the liquid lipophilic organic matter. The delivery device is configured to deliver at least a portion of the wastewater separated from the separation device to the washing device such that the wastewater is part of the scrubbing liquid.

The utility model has the advantages that the waste water generated by the suction and desorption device of the exhaust gas purifying device in the desorption mode is sent to the washing device for reuse by the conveying device, and as a part of the washing liquid, The discharge of the wastewater into the natural environment is reduced, and at the same time, the amount of the washing liquid can be reduced.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, a first embodiment of the novel exhaust gas purifying apparatus is suitable for purifying a waste gas to be treated containing a hydrophilic organic substance and a lipophilic organic substance, and is suitable for connecting a water vapor supply device for supplying water vapor (Fig. Show). The waste gas to be treated is, for example but not limited to, an exhaust gas produced in the process of preparing a polyurethane (PU). The hydrophilic organic substance is, for example but not limited to, dimethylformamide (DMF). The lipophilic organic material is for example but not limited to toluene. In this embodiment, the waste gas to be treated is an exhaust gas produced in the process of preparing a polyurethane, the hydrophilic organic substance includes dimethylformamide, and the lipophilic organic substance includes toluene. Since the water vapor supply device is not the main technical feature of the present invention, and the water vapor supply device is well known to those skilled in the art, the details are not described here for the sake of streamlining.

The exhaust gas purifying apparatus comprises a washing device 3, a suction and desorption device 5 connected to the washing device 3, a condensation device 6 connected to the suction and desorption device 5, a separation device 7 connected to the condensation device 6, and a connection device The separating device 7 and the conveying device 8 of the washing device 3, a heating device 9 connecting the suction and removal device 5 and the separating device 7, and a temperature sensing device 10 connected to the heating device 9.

The washing device 3 is for example but not limited to a horizontal scrubber or an upright scrubber. In the present embodiment, the washing device 3 is a horizontal washing tower. The washing device 3 includes a first outer casing 31 defining a first accommodating space 30, a washing unit 32, and a first circulation line unit 33 connecting the first outer casing 31.

The first accommodating space 30 has an air inlet 301 for entering the exhaust gas to be treated, an air outlet 302, and a liquid discharge port 303.

The washing unit 32 is disposed in the first accommodating space 30 of the first outer casing 31 and includes a plurality of spaced apart sprayers 321 . The sprinklers 321 are used to spray and contact the washing liquid of the exhaust gas to be treated. The washing liquid is for example but not limited to water. The washing liquid can absorb the hydrophilic organic substance and recover it from the waste gas to be treated through the compatibility with the hydrophilic organic substance entering the exhaust gas to be treated from the air inlet 301, so that the to-be-processed The exhaust gas is converted into the treated exhaust gas and discharged from the gas outlet 302, and the washing liquid is converted into waste liquid by absorbing the hydrophilic organic matter, and is deposited at the bottom of the first accommodating space 30 of the first outer casing 31, and then It is discharged from the liquid discharge port 303.

The first circulation line unit 33 is for circulating the waste liquid discharged from the liquid discharge port 303 to the washing unit 32 so that the waste liquid is used as a part of the washing liquid. Until the concentration of the hydrophilic organic substance in the waste liquid reaches a predetermined value, the operation of circulating the waste liquid to the washing unit 32 is stopped, and the waste liquid is discharged from the liquid discharge port 303 to a collection tank (not shown) Show). Through the first circulation line unit 33, the waste liquid is used as a part of the washing liquid, and the waste liquid can be directly used instead of continuously feeding the washing liquid from a washing liquid supply device (not shown). The washing liquid is not sent to the washing liquid supply device again until the concentration of the hydrophilic organic substance in the waste liquid reaches a predetermined value and is discharged, which not only reduces the amount of the washing liquid but also increases the waste liquid. The concentration of the hydrophilic organic matter.

Further, the washing apparatus 3 further includes a cooling unit 34 in order to increase the efficiency of recovering the hydrophilic organic matter from the washing liquid. The cooling unit 34 is connected to the washing unit 32 and the first circulation line unit 33, and is used to reduce the temperature of the washing liquid and the temperature of the waste liquid. When the temperature of the washing liquid and the temperature of the waste liquid are lower than the temperature of the waste gas to be treated, the washing liquid and the waste liquid can exchange heat with the hydrophilic organic substance of the waste gas to be treated to make the hydrophilic The organic matter is coagulated and recovered from the waste gas to be treated. The cooling unit 34 is for example but not limited to a heat exchanger. In a variant of the embodiment, the washing device 3 further comprises a temperature and humidity adjusting unit (not shown). The temperature and humidity adjustment unit is disposed in the first accommodating space 30 of the first outer casing 31 of the washing device 3 and adjacent to the air outlet 302. The temperature and humidity adjustment unit is configured to adjust the temperature and humidity of the treated exhaust gas, such as cooling and dehumidification, so that the dew point temperature of the treated exhaust gas adjusted by the temperature and humidity adjustment unit is the same as the dew point temperature of the to-be-treated exhaust gas. It is discharged from the gas outlet 302 again. The temperature and humidity adjustment unit is, for example but not limited to, a heat exchanger.

In order to further enhance the benefit of the recovery of the hydrophilic organic liquid by the washing liquid and reduce the load of the cooling unit 34 of the washing device 3 to cool the washing liquid, the exhaust gas purifying device further comprises a connection to the washing device 3 and for reducing the to-be-processed Cooling device 2 for the temperature of the gas. The cooling device 2 includes a first cooling unit 21 and a second cooling unit 22. The first cooling unit 21 is used to pre-cool the gas to be treated. The second cooling unit 22 is configured to perform a second cooling of the gas to be treated cooled by the first cooling unit 21, so that the gas to be treated enters the washing device 3 at a predetermined temperature, and then the washing liquid is recovered. The benefits of this hydrophilic organic matter. The first cooling unit 21 and the second cooling unit 22 are, for example but not limited to, a heat exchanger. In a variant of the embodiment, the cooling device 2 can also use a cooling unit to cool the gas to be treated until the gas to be treated enters the washing device 3 at the predetermined temperature. In a further variant of the embodiment, the cooling device 2 is arranged in the first housing space 30 of the first housing 31 of the washing device 3 and adjacent to the air inlet 301.

The suction and detachment device 5 includes a second outer casing 51 defining a second accommodating space 50, and an adsorbent 52 disposed in the second accommodating space 50. The second accommodating space 50 has an air inlet unit 501 and an air outlet unit 502. The air inlet unit 501 includes a first air inlet 5011 and a second air inlet 5012. The exhaust port unit 502 includes a first exhaust port 5021 and a second exhaust port 5022. The adsorbent is, for example but not limited to, activated carbon or zeolite or the like. The suction and desorption device 5 can be operated in one adsorption mode and one desorption mode. In the adsorption mode, the adsorbent 52 recovers the lipophilic organic matter in the treated exhaust gas entering from the first air inlet 5011, and the treated exhaust gas forms a purge gas and is discharged from the first exhaust port 5021. And the adsorbent 52 forms an adsorbent with the lipophilic organic substance. In the desorption mode, the adsorbent with the lipophilic organic substance is activated by the water vapor supply device and the water vapor entering from the second air inlet 5012 is activated to disengage the lipophilic organic substance, and The water vapor and the lipophilic organic matter are discharged from the second exhaust port 5022. The suction and desorption device 5 is, for example but not limited to, a fixed activated carbon bed, a fluidized floating activated carbon bed, or an activated carbon fiber bed. In the present embodiment, the suction and desorption device 5 is a stationary activated carbon bed.

Since the adsorption capacity of the adsorbent 52 of the adsorption and desorption device 5 is affected by the temperature and relative humidity of the treated exhaust gas, generally, the higher the relative humidity of the treated exhaust gas, the adsorption of the adsorbent 52. The lower the capacity, therefore, in order to increase the efficiency of adsorbing the lipophilic organic substance in the adsorption mode, the exhaust gas purifying apparatus further comprises a connection between the washing device 3 and the suction and desorption device 5 and is connected thereto. The washing device 3 and the adjusting device 4 of the suction and detachment device 5. The adjusting device 4 is configured to adjust at least one of temperature and humidity of the treated exhaust gas. The adjustment device 4 includes a heat exchanger 41 for adjusting the temperature of the treated exhaust gas such that the adsorbent 52 effectively adsorbs and recovers the lipophilic organic matter from the treated exhaust gas. Further, the temperature of the treated exhaust gas is adjusted by the adjusting device 4 without being on a saturation curve of a relative humidity line such as 100% of a psychometric chart. In a variant of the embodiment, the adjusting device 4 is disposed in the first accommodating space 30 of the first outer casing 31 of the washing device 3 and adjacent to the air outlet 302.

The condensing device 6 is connected to the suction and desorption device 5, and is configured to condense the water vapor discharged from the second exhaust port 5022 of the exhaust port unit 502 of the suction and desorption device 5 with the lipophilic organic substance to form Waste water and liquid lipophilic organic matter. The condensing device 6 is for example but not limited to a heat exchanger. The separating device 7 is connected to the condensing device 6 and is used to separate the wastewater and the liquid lipophilic organic matter. The separation device 7 is for example but not limited to a water separator.

The conveying device 8 is connected to the separating device 7 and the first circulation line unit 33 of the washing device 3, and is used for conveying at least a part of the waste water separated from the separating device 7 to the washing unit 32 of the washing device 3, The waste water is used as a part of the washing liquid, which in turn can reduce the discharge of the waste water into the natural environment, and at the same time, the amount of the washing liquid supplied from the washing liquid supply device can be reduced.

The heating device 9 includes a first heating unit 91 connected to the separating device 7, and a second inlet of the air inlet unit 501 connecting the first heating unit 91 and the second accommodating space 50 of the suction and detachment device 5. The second heating unit 92 of the port 5012. The first heating unit 91 is configured to convert another portion of the wastewater separated from the separation device 7 into the water vapor, thereby reducing the discharge of the wastewater into the natural environment, and at the same time reducing the water vapor. The amount of water vapor supplied by the supply equipment. The second heating unit 92 is configured to raise the temperature of the water vapor flowing out of the first heating unit 91 to provide sufficient kinetic energy to rapidly vaporize the oleophilic organic matter away from the adsorbent 52, and then lift the The sorbent 52 desorbs the lipophilic organic material in the desorption mode, shortens the desorption time, prolongs the life of the adsorbent 52, and increases the frequency of use of the absorption and desorption device 5.

The temperature sensing device 10 is located between the second heating unit 92 of the heating device 9 and the second air inlet 5012 of the air inlet unit 501 of the second housing space 50 of the suction and removal device 5, and is used for detecting the Water vapor temperature.

Referring to FIG. 3, a second embodiment of the present novel exhaust gas purifying apparatus is similar to the first embodiment, and is mainly different from the first embodiment in that when the condensing device 6 is a heat exchanger, the exhaust gas purifying device further includes A second circulation line unit 20 connecting the condensing device 6 and the heat exchanger 41 of the adjusting device 4. The second circulation line unit 20 is for conveying a heat exchange medium between the condensing device 6 and the heat exchanger 41 of the adjusting device 4. After the heat exchange medium (for example, the refrigerant) enters the condensing device 6 to exchange heat with the water vapor and the lipophilic organic matter, the temperature of the heat exchange medium increases, and is sent to the adjustment via the second circulation line unit 20. The heat exchanger 41 of the apparatus 4 serves as a heat exchange medium for the heat exchanger 41. After the heat exchange medium exchanges heat with the treated exhaust gas, the temperature of the heat exchange medium is lowered, and then sent to the condensing device 6 via the second circulation line unit 20, and serves as the heat of the condensing device 6. Exchange media, and then achieve energy savings.

Referring to FIG. 4, a third embodiment of the present invention is similar to the first embodiment. The main difference is that when the second cooling unit 22 of the cooling device 2 is a heat exchanger, the exhaust gas purification device further includes A heat exchanger 41 connecting the adjusting device 4 and a third circulating line unit 40 of the second cooling unit 22 of the cooling device 2. The third circulation line unit 40 is for conveying a heat exchange medium between the heat exchanger 41 of the adjustment device 4 and the second cooling unit 22 of the cooling device 2. After the heat exchange medium (for example, the refrigerant) enters the second cooling unit 22 of the cooling device 2 to exchange heat with the gas to be treated, the temperature of the heat exchange medium increases, and is sent to the third circulation line unit 40 via the third circulation line unit 40. The heat exchanger 41 of the adjusting device 4 serves as a heat exchange medium for the heat exchanger 41. After the heat exchange medium exchanges heat with the treated exhaust gas, the temperature of the heat exchange medium is lowered, and then sent to the second cooling unit 22 of the cooling device 2 via the third circulation line unit 40, and The heat exchange medium of the second cooling unit 22 of the cooling device 2, in turn, achieves an energy saving effect.

In summary, the exhaust gas purifying apparatus of the present invention transmits the waste water generated by the suction and desorption apparatus 5 of the exhaust gas purifying apparatus in the desorption mode to the washing unit 32 of the washing apparatus 3 through the conveying device 8, and reuses As a part of the washing liquid, the waste water can be reduced to the natural environment, and at the same time, the amount of the washing liquid can be reduced, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

2‧‧‧Cooling device
21‧‧‧First cooling unit
22‧‧‧Second cooling unit
3‧‧‧Washing device
31‧‧‧ first shell
30‧‧‧First accommodation space
301‧‧‧air inlet
302‧‧‧ outlet
303‧‧‧Draining port
32‧‧‧Washing unit
321‧‧‧Sprinkler
33‧‧‧First circulating piping unit
34‧‧‧Cooling unit
4‧‧‧Adjustment device
41‧‧‧ heat exchanger
5‧‧‧Sucking and desorbing device
51‧‧‧ second casing
50‧‧‧Second accommodation space
501‧‧‧ inlet unit
5011‧‧‧First air inlet
5012‧‧‧second air inlet
502‧‧‧Exhaust port unit
5021‧‧‧first exhaust
5022‧‧‧second exhaust port
52‧‧‧ adsorbent
6‧‧‧Condensing device
7‧‧‧Separation device
8‧‧‧Conveyor
9‧‧‧ heating device
91‧‧‧First heating unit
92‧‧‧Second heating unit
10‧‧‧Temperature sensing device
20‧‧‧Second circulation piping unit
40‧‧‧ Third circulation piping unit

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a schematic view of a conventional organic solvent recovery apparatus disclosed in Taiwan Patent No. M373772; Is a schematic view of a first embodiment of the present invention; FIG. 3 is a schematic view of a second embodiment of the novel exhaust gas purification apparatus; and FIG. 4 is a third embodiment of the novel exhaust gas purification apparatus. A schematic diagram of the.

2‧‧‧Cooling device

51‧‧‧ second casing

21‧‧‧First cooling unit

50‧‧‧Second accommodation space

22‧‧‧Second cooling unit

501‧‧‧ inlet unit

3‧‧‧Washing device

5011‧‧‧First air inlet

31‧‧‧ first shell

5012‧‧‧second air inlet

30‧‧‧First accommodation space

502‧‧‧Exhaust port unit

301‧‧‧air inlet

5021‧‧‧first exhaust

302‧‧‧ outlet

5022‧‧‧second exhaust port

303‧‧‧Draining port

52‧‧‧ adsorbent

32‧‧‧Washing unit

6‧‧‧Condensing device

321‧‧‧Sprinkler

7‧‧‧Separation device

33‧‧‧First circulating piping unit

8‧‧‧Conveyor

34‧‧‧Cooling unit

9‧‧‧ heating device

4‧‧‧Adjustment device

91‧‧‧First heating unit

41‧‧‧ heat exchanger

92‧‧‧Second heating unit

5‧‧‧Sucking and desorbing device

10‧‧‧Temperature sensing device

Claims (6)

An exhaust gas purifying device, which is suitable for purifying a waste gas to be treated containing a hydrophilic organic substance and a lipophilic organic substance, and is suitable for connecting a water vapor supply device for supplying water vapor, the exhaust gas purification device comprising: a washing device, including a first a casing defining a first accommodating space, the first accommodating space having an air inlet and an air outlet for entering the exhaust gas to be treated, and a washing unit disposed at the first capacity of the first casing a washing liquid for spraying and contacting the exhaust gas to be treated, the washing liquid recovering hydrophilic organic matter in the exhaust gas to be treated entering from the air inlet, so that the exhaust gas to be treated forms the treated exhaust gas and Discharged from the air outlet, and the washing liquid forms a waste liquid; a suction and release device connected to the washing device, comprising a second outer casing defining a second receiving space, and the second receiving space has an inlet a port unit and a vent unit, and an adsorbent disposed in the second accommodating space, the absorbing and desorbing device can be operated in a suction a mode and a desorption mode, wherein the adsorbent recovers the lipophilic organic matter in the treated exhaust gas entering from the gas inlet unit, so that the treated exhaust gas forms a purge gas from the exhaust port The unit is discharged, and the adsorbent forms an adsorbent having the lipophilic organic substance, and in the desorption mode, the adsorbent carrying the lipophilic organic substance is activated by the water vapor entering from the gas inlet unit, thereby The lipophilic organic substance is detached, and the water vapor and the oleophilic organic substance are discharged from the vent unit; a condensing device is connected to the absorbing and desorbing device for discharging the water vapor discharged from the absorbing and desorbing device The oleophilic organic substance is condensed to form waste water and liquid lipophilic organic matter; a separating device is connected to the condensing device for separating the wastewater and the liquid lipophilic organic substance; and a first conveying device is connected to the separating device and the washing device And at least a portion of the wastewater separated from the separation device is sent to the washing device to make the wastewater as part of the washing liquid An exhaust gas purifying apparatus according to claim 1, further comprising a heating device connected to the suction and desorption device and the separation device, the heating device including a further portion connected to the separation device for separating the separation device The wastewater is converted to a first heating unit of the water vapor. The exhaust gas purifying apparatus according to claim 2, wherein the heating means further comprises a second heating unit connected to the first heating unit and the suction and desorption means for raising the temperature of the water vapor. The exhaust gas purifying apparatus according to claim 3, further comprising a temperature sensing device located between the second heating unit of the heating device and the suction and desorption device for detecting the temperature of the water vapor. The exhaust gas purifying apparatus according to claim 1, further comprising an adjusting device between the washing device and the suction and desorption device, the adjusting device for adjusting at least one of temperature and humidity of the treated exhaust gas. The exhaust gas purifying apparatus according to claim 1, further comprising a cooling device connected to the washing device and configured to lower the temperature of the gas to be treated.