CN105597490B - Organic waste gas adsorption, desorption, concentration and purification system and method thereof - Google Patents

Organic waste gas adsorption, desorption, concentration and purification system and method thereof

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Publication number
CN105597490B
CN105597490B CN201410673481.2A CN201410673481A CN105597490B CN 105597490 B CN105597490 B CN 105597490B CN 201410673481 A CN201410673481 A CN 201410673481A CN 105597490 B CN105597490 B CN 105597490B
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CN
China
Prior art keywords
temperature
gas
waste gas
desorption
heat exchanger
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CN201410673481.2A
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Chinese (zh)
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CN105597490A (en
Inventor
张丰堂
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杰智环境科技股份有限公司
张丰堂
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Priority to CN201410673481.2A priority Critical patent/CN105597490B/en
Publication of CN105597490A publication Critical patent/CN105597490A/en
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Publication of CN105597490B publication Critical patent/CN105597490B/en

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Abstract

The invention discloses an organic waste gas adsorption and desorption concentration and purification system, which is characterized in that before waste gas enters a zeolite rotating wheel concentration device, a temperature and humidity return unit is used for leading out waste heat of an incinerator and heating the waste gas, so that the temperature and the relative humidity of the waste gas entering the zeolite rotating wheel concentration device are increased, the adsorption capacity of the zeolite rotating wheel concentration device on organic substances in the waste gas can be improved, and the removal efficiency of the organic substances in the waste gas is further improved. In addition, the organic waste gas adsorption, desorption, concentration and purification system and the method thereof heat the waste gas by using the waste heat of the incinerator, and control the flow rate of the high-temperature gas of the incinerator led out according to the temperature of the waste gas, so the system has the advantage of reducing energy consumption because a device and/or a pipeline for heating are not additionally arranged, in addition, the pressure loss caused by an additional component in a system pipeline can be reduced, and the complexity of the system can be reduced.

Description

Organic waste gas adsorption, desorption, concentration and purification system and method thereof

Technical Field

The invention relates to an organic waste gas adsorption, desorption, concentration and purification system and a method thereof, which are used for reducing or removing organic substances in waste gas.

Background

In many processes, exhaust gas containing organic substances is generated, and most of volatile organic substances are harmful to human bodies, so that the exhaust gas generated in the processes can be discharged to the external environment after being purified and meeting the exhaust emission standard. The existing organic waste gas purification system adopts a zeolite rotating wheel concentration device and an incinerator, wherein the inside of the zeolite rotating wheel concentration device is partitioned into an adsorption area and a desorption area, a zeolite rotating wheel continuously rotates to pass through the adsorption area and the desorption area, waste gas generated in the process is introduced into the adsorption area, organic substances in the waste gas are adsorbed by the zeolite rotating wheel, the zeolite rotating wheel rotates to the desorption area, the organic substances adsorbed on the zeolite rotating wheel are desorbed by introduced desorption gas flow, and desorption gas flow with the desorbed organic substances is introduced into the incinerator for incineration. Therefore, through the rotation operation of the zeolite rotating wheel, the zeolite rotating wheel continuously repeats the steps of adsorption and desorption, and organic substances contained in the waste gas passing through the zeolite rotating wheel concentration device are reduced to the emission standard and then can be discharged into the atmosphere.

In some processes (such as spraying process), the exhaust gas generated by the process contains a large amount of particulate matter, therefore, a scrubber or other dust-cleaning device is often used to scrub the exhaust gas at the rear end of the process to reduce the particulate matter in the exhaust gas, so that the exhaust gas is finally discharged at low temperature and high humidity.

However, the low-temperature and high-humidity exhaust gas is not favorable for the removal efficiency of the hydrophobic zeolite to the organic substances in the zeolite rotating wheel concentration device, specifically, the higher the temperature of the exhaust gas is, the lower the removal efficiency of the zeolite rotating wheel to the organic substances in the exhaust gas is, for example, isopropanol is taken as an example, when the exhaust gas reaches above 45 ℃, the removal efficiency of the zeolite rotating wheel to the isopropanol is reduced to below 92%, and the removal efficiency is rapidly reduced along with the increase of the temperature; however, if the temperature of the exhaust gas is too low (generally below 20 ℃), the wheel surface of the zeolite wheel may be condensed and wet because the temperature is lower than the dew point temperature of the desorbed gas, and the removal efficiency may be rapidly reduced; under the conditions of temperature and other conditions, the higher the relative humidity of the waste gas is, the lower the removal efficiency of the zeolite rotating wheel to organic substances in the waste gas is, for example, isopropanol or acetone, when the relative humidity of the waste gas reaches more than 85%, the removal efficiency of the zeolite rotating wheel to the isopropanol or the acetone is rapidly reduced to less than 90%, and the removal efficiency is rapidly reduced along with the increase of the relative humidity.

Accordingly, when the conventional organic waste gas purification system is applied to the treatment of waste gas with low temperature and high humidity, the organic matter removal efficiency is poor, and the energy consumption is low.

Disclosure of Invention

In order to solve the problem that the removal efficiency of organic matters is poor when the existing organic waste gas purification system is applied to treating low-temperature and high-humidity waste gas, the invention provides an organic waste gas adsorption, desorption, concentration and purification system and method.

In order to achieve the above and other objects, the present invention provides an organic waste gas adsorption, desorption, concentration and purification system, comprising an incinerator, a waste heat bypass heat exchanger, a zeolite wheel concentration device, a temperature sensor and a temperature return control unit; the waste heat bypass heat exchanger is connected with the combustion chamber to introduce high-temperature gas of the combustion chamber for heat exchange; the zeolite rotating wheel concentration device is provided with an adsorption area, a blowing area and a desorption area, wherein the inlet end of the adsorption area is connected with a waste gas inlet pipe, the outlet end of the adsorption area is connected with a chimney, the inlet end of the blowing area is used for inputting blowing gas flow, the outlet end of the blowing area is connected with the waste heat bypass heat exchanger, the blowing gas flow is heated by the waste heat bypass heat exchanger to be used as desorption gas flow and input to the inlet end of the desorption area, and the outlet end of the desorption area is connected with the incinerator; the temperature sensor is arranged at the inlet end of the waste gas inlet pipe close to the adsorption area and used for measuring the temperature in the waste gas inlet pipe; the temperature return and humidity control unit is connected to the waste gas inlet pipe, high-temperature gas is led out from the incinerator by the temperature return and humidity control unit to heat waste gas in the waste gas inlet pipe, and the flow of the led-out high-temperature gas is controlled according to the temperature measured by the temperature sensor.

In the above adsorption, desorption, concentration and purification system, the temperature and humidity return unit comprises a temperature return heat exchanger, a flow guide line and a circulating windmill, the temperature return heat exchanger is connected to the waste heat bypass heat exchanger, and the high-temperature gas at the outlet of the waste heat bypass heat exchanger is introduced into the chimney and flows to the chimney after passing through the temperature return heat exchanger; the drainage pipeline is provided with an eduction pipe and a return pipe, two ends of the eduction pipe are connected with the inlet end of the adsorption area and the temperature return heat exchanger, and two ends of the return pipe are connected with the temperature return heat exchanger and the waste gas inlet pipe; and the circulating windmill is used for pumping and leading out a part of waste gas at the inlet end of the adsorption area to the temperature return exchanger through the lead-out pipe and conveying the waste gas subjected to heat exchange with high-temperature gas to the waste gas inlet pipe through the return pipe, and the circulating windmill determines the pumped flow according to the temperature measured by the temperature sensor.

In the above organic waste gas adsorption, desorption, concentration and purification system, a particulate filter is disposed in front of the inlet end of the adsorption zone for filtering particulate matters in the waste gas input from the waste gas inlet pipe.

The above organic waste gas adsorption, desorption, concentration and purification system, wherein the incinerator is a direct-fired incinerator, the incinerator is provided with a preheating heat exchanger connected with the combustion chamber, the outlet end of the desorption region is connected to the preheating heat exchanger, the desorption gas flow flows to the combustion chamber after being preheated by the preheating heat exchanger, and forms high-temperature gas after being combusted, the high-temperature gas enters the preheating heat exchanger for heat exchange, the waste heat bypass heat exchanger is connected with the preheating heat exchanger, and the high-temperature gas at the outlet of the preheating heat exchanger exchanges heat with the return heat exchanger through the waste heat bypass heat exchanger.

In the organic waste gas adsorption, desorption, concentration and purification system, the communication groove body is arranged at the outlet end of the combustion chamber, and the preheating heat exchanger, the waste heat bypass heat exchanger and the temperature return heat exchanger are arranged in the communication groove body in a close manner.

In the above organic waste gas adsorption, desorption, concentration and purification system, the temperature and humidity return unit comprises a tail gas recovery pipeline, a proportional control valve and a counterweight type check damper, and the inlet end and the outlet end of the tail gas recovery pipeline are respectively connected to the exhaust pipeline and the waste gas inlet pipe of the incinerator; the proportional control valve is arranged on the tail gas recovery pipe in an on-line manner, and proportionally controls the flow passing through the tail gas recovery pipe according to the temperature sensed by the temperature sensor; the counterweight type check air door is arranged on the exhaust pipe of the incinerator and is adjacent to the inlet end of the tail gas recovery pipeline, and the opening size of the counterweight type check air door is determined according to the air pressure in the exhaust pipe.

In the above organic waste gas adsorption, desorption, concentration and purification system, a particulate filter is disposed in front of the inlet end of the adsorption zone for filtering particulate matters in the waste gas input from the waste gas inlet pipe.

In order to achieve the above and other objects, the present invention further provides a method for absorbing, desorbing, concentrating and purifying organic waste gas, which is used for treating waste gas containing organic substances, the method for absorbing, desorbing, concentrating and purifying organic waste gas comprises the following steps: a, introducing the waste gas into a zeolite rotating wheel concentration device through a waste gas inlet pipe, wherein the zeolite rotating wheel concentration device at least comprises an adsorption area and a desorption area, the inlet end of the adsorption area is connected with the waste gas inlet pipe, the outlet end of the adsorption area is connected with a chimney, the inlet end of the desorption area inputs desorption gas flow, the outlet end of the desorption area is connected with an incinerator, and the incinerator is used for incinerating the desorption gas flow from the desorption area; b leading high-temperature gas of the incinerator to the waste gas inlet pipe, and heating waste gas in the waste gas inlet pipe; c measuring the temperature in the exhaust gas inlet pipe; d controlling the flow of the high temperature gas drawn from the incinerator according to the measured temperature. Therefore, the waste gas at the inlet end of the adsorption area of the zeolite rotating wheel concentration device is heated and dehumidified, so that the adsorption capacity of the zeolite rotating wheel concentration device on organic substances is improved.

In the above method for purifying organic waste gas by adsorption and desorption concentration, steps b to d are repeated to raise the temperature of the waste gas in the waste gas inlet pipe to 20-40 ℃ and the relative humidity to be lower than 80%.

In the above organic waste gas adsorption, desorption, concentration and purification method, in the step b, the high-temperature gas is led out from the combustion chamber of the incinerator, or the high-temperature gas is tail gas at the outlet end of the incinerator.

Therefore, the organic waste gas adsorption, desorption, concentration and purification system and the method thereof can increase the temperature and reduce the relative humidity of the waste gas in the waste gas inlet pipe before the waste gas enters the zeolite rotating wheel concentration device, thereby enhancing the adsorption capacity of the zeolite rotating wheel concentration device on the organic substances in the waste gas and improving the removal efficiency of the organic substances in the waste gas. In addition, the organic waste gas absorbing, desorbing, concentrating and purifying system of the invention utilizes waste heat of the incinerator to heat the waste gas in the waste gas inlet pipe, and does not need to additionally install a heating device and/or a pipeline, so the system has the advantage of reducing energy consumption, in addition, the pressure loss caused by an additional component in the pipeline of the system can be reduced, and the complexity of the system can be reduced.

Drawings

Fig. 1 is a schematic configuration diagram of an organic waste gas adsorption, desorption, concentration and purification system according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a configuration of the organic waste gas adsorption, desorption, concentration and purification system according to the first embodiment of the present invention, which does not include a particulate matter filter.

Fig. 3 is a schematic configuration diagram of an organic waste gas adsorption, desorption, concentration and purification system according to a second embodiment of the present invention.

Fig. 4 is a schematic configuration diagram of an organic waste gas adsorption, desorption, concentration and purification system according to a third embodiment of the present invention.

[ notation ] to show

1 organic waste gas adsorption and desorption concentration purification system

110 incinerator

111 combustion chamber

112,113 regenerator

114 poppet valve

120 waste heat bypass heat exchanger

130 zeolite rotary wheel concentration device

131 adsorption zone

132 blow off zone

133 desorption zone

134 zeolite runner

140 temperature sensor

150 temperature return and humidity control unit

151 temperature return heat exchanger

152 drain line

152a lead-out pipe

152b return pipe

153 circulation windmill

160 waste gas inlet pipe

170 chimney

180 particulate matter filter

2 organic waste gas absorption, desorption, concentration and purification system

210 incinerator

211 combustion chamber

212 preheat heat exchanger

215 communicating trough body

220 waste heat bypass heat exchanger

250 temperature return and humidity control unit

251 back temperature heat exchanger

252 flow line

252a lead-out tube

252b return pipe

253 circulation windmill

310 incinerator

311 combustion chamber

312 exhaust line

314 poppet valve

350 temperature return and humidity control unit

351 tail gas recovery pipeline

352 proportional control valve

353 counterweight type non-return air door

360 buffer gas flow line

361 control valve

362 buffer tank

Detailed Description

For a fuller understanding of the objects, features and effects of the present invention, reference should now be made to the following detailed description taken in conjunction with the accompanying drawings, in which:

the system and method for absorbing, desorbing, concentrating and purifying organic waste gas are used for treating waste gas discharged from the rear end of the process, and particularly, some processes (such as spraying process) perform dust scrubbing treatment on the waste gas by using a scrubbing tower before discharging the waste gas to remove most of particulate matters in the waste gas, and the temperature of the waste gas passing through the scrubbing tower is reduced to 20-30 ℃ and the humidity is increased to 100%. The organic waste gas adsorption, desorption, concentration and purification method comprises the following steps: a, introducing the waste gas into a zeolite rotating wheel concentration device through a waste gas inlet pipe, wherein the zeolite rotating wheel concentration device at least comprises an adsorption area and a desorption area, the inlet end of the adsorption area is connected with the waste gas inlet pipe, the outlet end of the adsorption area is connected with a chimney, the inlet end of the desorption area inputs desorption gas flow, the outlet end of the desorption area is connected with an incinerator, and the incinerator is used for incinerating the desorption gas flow from the desorption area; b leading high-temperature gas of the incinerator to the waste gas inlet pipe, and heating waste gas in the waste gas inlet pipe; c measuring the temperature in the exhaust gas inlet pipe; d controlling the flow of the high temperature gas drawn from the incinerator according to the measured temperature. Therefore, the waste gas at the inlet end of the adsorption area of the zeolite rotating wheel concentration device is heated and dehumidified, so that the adsorption capacity of the zeolite rotating wheel concentration device on organic substances is improved.

As shown in fig. 1, the organic waste gas adsorption, desorption, concentration and purification system 1 according to the first embodiment of the present invention is used for treating organic waste gas generated after a manufacturing process, and includes an incinerator 110, a waste heat bypass heat exchanger 120, a zeolite wheel concentrator 130, a temperature sensor 140 and a temperature and humidity control unit 150.

The incinerator 110 has a combustion chamber 111, and a burner or an electric heater is provided in the combustion chamber 111 to burn an introduced gas.

The waste heat bypass heat exchanger 120 is connected to the combustion chamber 111 to introduce the high temperature gas of the combustion chamber 111 for heat exchange, wherein the high temperature gas introduced by the combustion chamber 111 serves as a heating source.

The zeolite rotating wheel concentrating device 130 has an adsorption region 131, a blowing region 132 and a desorption region 133, wherein the adsorption region 131, the blowing region 132 and the desorption region 133 form a partition in the tank body, the zeolite rotating wheel 134 is disposed in the tank body and can rotate to pass through the adsorption region 131, the desorption region 133 and the blowing region 132 in sequence, in the adsorption region 131, the zeolite rotating wheel 134 adsorbs organic substances in the exhaust gas, in the desorption region 33, the organic substances adsorbed on the zeolite rotating wheel 134 are desorbed by desorption gas flow, and in the blowing region 132, the desorbed zeolite rotating wheel 134 is cooled and dehumidified by blowing gas flow.

Wherein, the inlet end of the adsorption zone 131 is connected with the exhaust gas inlet pipe 160 and the outlet end is connected with the chimney 170, and the exhaust gas is adsorbed by the adsorption zone 131 and then is discharged to the chimney 170; the inlet end of the blowing area 132 is used for inputting low-temperature blowing gas flow, the outlet end is connected to the waste heat bypass heat exchanger 120, the low-temperature blowing gas is heated by the waste heat bypass heat exchanger 120 and then is used as desorption gas flow and is input to the inlet end of the desorption area 133, the outlet end of the desorption area 133 is connected to the incinerator 110, and the desorption gas flow containing organic substances is introduced into the incinerator 110 for incineration treatment.

The temperature sensor 140 is disposed at an inlet end of the exhaust gas inlet pipe 160 near the adsorption region 131, and is used for measuring a temperature in the exhaust gas inlet pipe 160.

The temperature and humidity control unit 150 is connected to the exhaust gas inlet pipe 160, and the temperature and humidity control unit 150 heats the exhaust gas in the exhaust gas inlet pipe 160 by the high temperature gas extracted from the incinerator 110, and controls the flow rate of the extracted high temperature gas according to the temperature measured by the temperature sensor 140. The high temperature gas from the incinerator 110 is mixed with the exhaust gas in the exhaust gas inlet pipe 160 to heat the exhaust gas, and the temperature of the exhaust gas is raised to 20-40 ℃ and the relative humidity is lower than 80% before the exhaust gas enters the adsorption zone 131 of the zeolite wheel concentration device 130.

In this embodiment, the temperature and humidity return unit 150 includes a temperature return heat exchanger 151, a flow guiding line 152 and a circulating windmill 153, the temperature return heat exchanger 151 is connected to the waste heat bypass heat exchanger 120, and the high temperature gas at the outlet of the waste heat bypass heat exchanger 120 is introduced into the temperature return heat exchanger 151 and flows to the chimney 170; the drainage pipeline 152 has an outlet pipe 152a and a return pipe 152b, both ends of the outlet pipe 152a are connected to the inlet end of the adsorption region 131 and the temperature-returning heat exchanger 151, and both ends of the return pipe 152b are connected to the temperature-returning heat exchanger 151 and the exhaust gas inlet pipe 160; the circulation windmill 153 is disposed on the drainage line 152 and electrically connected to the temperature sensor 140, the circulation windmill 153 is used for pumping and leading out a part of the exhaust gas at the inlet end of the adsorption region 131 to the temperature return exchanger 151 through the lead-out pipe 152a, and for delivering the exhaust gas after heat exchange with the high-temperature gas to the exhaust gas inlet pipe 160 through the return pipe 152b, and the circulation windmill 153 determines the pumping flow rate according to the temperature measured by the temperature sensor 140.

For example, when the temperature measured by the temperature measuring device 140 is lower than a predetermined value (e.g., 20 ℃), the circulation fan 153 increases the circulation air volume, so as to increase the flow rate of the exhaust gas pumped to the temperature-returning heat exchanger 151, and further increase the flow rate of the exhaust gas that is heated to a higher temperature and is sent back to the exhaust gas inlet pipe 160 through the return pipe 152 b. When the temperature measured by the temperature measuring device 140 is higher than a predetermined value (e.g., 40 ℃), the circulation fan 153 decreases the circulation air volume, so that the flow rate of the exhaust gas pumped to the temperature-returning heat exchanger 151 decreases, and the flow rate of the exhaust gas that is at a higher temperature after heat exchange and is sent back to the exhaust gas inlet pipe 160 through the return pipe 152b decreases.

In the embodiment, the incinerator 110 is exemplified as a double-channel regenerative incinerator, two regenerators 112,113 are connected to both sides of the combustion chamber 111, and the inlet and outlet of the incinerator 110 can be opened and closed by a poppet valve 114 or other valve set. The type of the incinerator 110 and the arrangement of the related pipelines of the inlet and outlet gases are not limited to the embodiment and the drawings, and the incinerator 110 may be a three-tank regenerative incinerator or a rotary regenerative incinerator.

Accordingly, in the organic exhaust gas adsorption, desorption, concentration and purification system 1 according to the first embodiment of the present invention, the temperature of the exhaust gas in the exhaust gas inlet pipe 160 is increased and the relative humidity is decreased by the temperature and humidity control unit 150 before the exhaust gas enters the zeolite wheel concentration device 130, so that the adsorption capacity of the zeolite wheel concentration device 130 on the organic substances in the exhaust gas can be improved, and the removal efficiency of the organic substances in the exhaust gas can be further improved. In addition, the organic waste gas absorption, desorption, concentration and purification system 1 according to the first embodiment of the present invention utilizes the high temperature gas bypassed from the combustion chamber 111 of the incinerator 110 to heat the blowing gas stream as the high temperature desorption gas stream, and simultaneously, the high temperature gas is further led out to heat the exhaust gas circulating in the temperature return heat exchanger 151, and the heated exhaust gas flows to the exhaust gas inlet pipe 160 through the diversion pipeline 152 to raise the temperature of the exhaust gas in the exhaust gas inlet pipe 160, without additionally installing a heating device and/or a pipeline, so that the present invention has an advantage of reducing energy consumption, and in addition, the pressure loss caused by additional components in the pipeline of the system can be reduced, and the complexity of the system can be reduced.

As shown in fig. 2, the organic exhaust gas adsorption, desorption, concentration and purification system 1 according to the first embodiment of the present invention may further comprise a particulate filter 180, wherein the particulate filter 180 is disposed in front of the inlet end of the adsorption region 131 for filtering particulate matters in the exhaust gas inputted from the exhaust gas inlet pipe 160, so as to reduce particulate matters in the exhaust gas from blocking pipelines, the zeolite wheel 134 and other components through which the exhaust gas passes.

Fig. 3 is a schematic configuration diagram of an organic waste gas adsorption, desorption, concentration and purification system 2 according to a second embodiment of the present invention. The second embodiment of the present invention is different from the first embodiment mainly in the structure and arrangement of the incinerator, the waste heat bypass heat exchanger, and the temperature and humidity return unit. In addition, in the drawings of the present embodiment, the same reference numerals are used for the same components as those of the first embodiment.

In the second embodiment of the present invention, the incinerator 210 is implemented as a direct combustion incinerator, the incinerator 210 has a preheating heat exchanger 212 connected to the combustion chamber 211, and the outlet end of the desorption region 133 is connected to the preheating heat exchanger 212, the desorption gas stream containing organic substances flows to the combustion chamber 211 after being preheated by the preheating heat exchanger 212, and the desorption gas stream is preheated by the high temperature gas formed by combustion entering the preheating heat exchanger, i.e. the high temperature gas and the desorption gas stream subsequently entering the preheating heat exchanger 212.

In this embodiment, the waste heat bypass heat exchanger 220 is connected to the preheating heat exchanger 212 of the incinerator 210, and the high-temperature gas flowing out of the preheating heat exchanger 212 is used as a heat source for heat exchange, so that the desorption gas flow entering the waste heat bypass heat exchanger 220 exchanges heat with the high-temperature gas.

The temperature-returning heat exchanger 251 of the temperature-returning humidity-controlling unit 250 of this embodiment is connected to the waste heat bypass heat exchanger 220, and the high-temperature gas at the outlet of the waste heat bypass heat exchanger 220 is introduced into the chimney 170 and flows through the temperature-returning heat exchanger 251.

Specifically, the preheating heat exchanger 212, the waste heat bypass heat exchanger 220, and the temperature return heat exchanger 251 are disposed adjacent to each other and communicated with each other, so that the high-temperature gas formed by the combustion in the combustion chamber 211 sequentially passes through the preheating heat exchanger 212, the waste heat bypass heat exchanger 220, and the temperature return heat exchanger 251. As shown, the outlet end of the combustion chamber 211 may be provided with a communication tank 215, and the preheating heat exchanger 212, the waste heat bypass heat exchanger 220 and the temperature returning heat exchanger 251 are adjacently disposed in the communication tank 215.

The drainage line 252 of the temperature and humidity control unit 250 of this embodiment has an outlet 252a and a return pipe 252b, wherein two ends of the outlet 252a are connected to the inlet of the adsorption region 131 and the temperature heat exchanger 251, and two ends of the return pipe 252b are connected to the temperature heat exchanger 251 and the exhaust gas inlet pipe 160.

The circulation windmill 253 of the temperature and humidity control unit 250 of the present embodiment is disposed on the drainage line 252 and electrically connected to the temperature sensor 140, the circulation windmill 253 is used for pumping and leading out a part of the exhaust gas at the inlet end of the adsorption region 131 to the temperature return exchanger 251 through the outlet pipe 252b, and conveying the exhaust gas after heat exchange with the high-temperature gas back to the exhaust gas inlet pipe 160 through the return pipe 252b, and the circulation windmill 253 determines the flow rate of pumping according to the temperature measured by the temperature sensor 140.

In this embodiment, the organic waste gas adsorption, desorption, concentration and purification system 2 may comprise a particulate filter 180, the particulate filter 180 is disposed in front of the inlet end of the adsorption zone 131 for filtering particulate matters in the waste gas inputted from the waste gas inlet pipe 160, so as to reduce the particulate matters in the waste gas from blocking the pipeline, the zeolite wheel 134 and other components through which the waste gas passes.

Accordingly, in the organic exhaust gas adsorption, desorption, concentration and purification system 2 according to the second embodiment of the present invention, the temperature of the exhaust gas in the exhaust gas inlet pipe 160 is increased and the relative humidity is decreased by the temperature and humidity control unit 250 before the exhaust gas enters the zeolite wheel concentration device 130, so that the adsorption capacity of the zeolite wheel concentration device 130 on the organic substances in the exhaust gas can be improved, and the removal efficiency of the organic substances in the exhaust gas can be further improved. In addition, the organic waste gas adsorption, desorption, concentration and purification system 2 according to the second embodiment of the present invention allows the high temperature gas combusted in the combustion chamber 211 of the incinerator 210 to flow through the preheating heat exchanger 212, the waste heat bypass heat exchanger 220 and the temperature return heat exchanger 251, so as to heat the purge gas flow as the high temperature desorption gas flow by the high temperature gas combusted in the combustion chamber 211, and heat the waste gas in the diversion pipeline 252, and the heated waste gas flows back to the waste gas inlet pipe 160 through the diversion pipeline 252, so as to raise the temperature of the waste gas in the waste gas inlet pipe 160, without additionally installing a heating device and/or a pipeline, thereby reducing energy consumption.

As shown in fig. 4, it is a schematic configuration diagram of an organic waste gas adsorption, desorption, concentration and purification system 3 according to a third embodiment of the present invention. The third embodiment of the present invention is different from the first embodiment mainly in the structure and configuration of the temperature and humidity return unit, and in addition, the same reference numerals are used for the elements in the drawings of the present embodiment that have the same functions and functions as the first embodiment.

In the third embodiment of the present invention, the temperature and humidity control unit 350 of the organic waste gas adsorption, desorption, concentration and purification system 3 includes a tail gas recovery pipeline 351, a proportional control valve 352 and a counterweight check damper 353.

The inlet end and the outlet end of the tail gas recycling line 351 are respectively connected to the exhaust line 312 of the incinerator 310 and the exhaust gas inlet pipe 160, wherein the exhaust line 312 is used for discharging the gas after the combustion treatment of the incinerator 310 to the chimney 170.

The proportional control valve 352 is disposed on the exhaust gas recycling line 351, and the proportional control valve 352 proportionally controls the flow rate through the exhaust gas recycling line 351 according to the temperature sensed by the temperature sensor 140 through the opening size of the valve; for example, when the temperature measured by the temperature sensor 140 is lower than a predetermined value (e.g., 20 ℃), the proportional control valve 352 is also opened to increase the flow rate of the combustion-treated high-temperature gas passing through the tail gas recovery line 351. When the temperature measured by the temperature measuring device 140 is higher than a predetermined value (e.g., 40 ℃), the proportional control valve 352 is closed to reduce the flow rate of the high-temperature gas after the combustion process through the exhaust gas recovery line 351.

The counterweight type check damper 353 is disposed on the exhaust line 312 of the incinerator 310 and close to the inlet end of the exhaust gas recovery line 351, the counterweight type check damper 353 has a counterweight linkage structure (not shown) related to the pressure of the air in the pipe, and the opening size of the counterweight type check damper 353 is determined according to the pressure of the air in the exhaust line 312.

Specifically, when the proportional control valve 352 is open, the flow in the exhaust line 312 flows to the exhaust recovery line 351, and the counter weight check damper 353 is closed down or fully closed due to the decrease in air pressure in the exhaust line 312; when the proportional control valve 352 is closed, the airflow in the exhaust line 312 flows to the counterweight check damper 242, and the counterweight check damper 353 is kept open because the air pressure in the exhaust line 312 is not changed, so that the airflow in the exhaust line 312 flows to the chimney 170 through the counterweight check damper 353.

In this embodiment, the organic waste gas adsorption, desorption, concentration and purification system 3 may comprise a particulate filter 180, the particulate filter 180 is disposed in front of the inlet end of the adsorption zone 131 for filtering particulate matters in the waste gas inputted from the waste gas inlet pipe 160, so as to reduce the particulate matters in the waste gas from blocking the pipeline, the zeolite wheel 134 and other components through which the waste gas passes.

In addition, in this embodiment, the tail gas recycling line 351 can be connected to a buffer gas line 360, a control valve 361 and a buffer tank 362 are disposed on the buffer gas line 360, when the lift valve 314 of the incinerator switches the flow direction, the control valve 361 is opened, and the tail gas of the incinerator 310 is introduced into the buffer tank 362, so that the tail gas which may contain organic matters is sent to the zeolite wheel concentration device 130 for treatment.

Accordingly, in the organic waste gas adsorption, desorption, concentration and purification system 3 according to the third embodiment of the present invention, the temperature of the waste gas in the waste gas inlet pipe 160 is increased and the relative humidity is decreased by the temperature and humidity control unit 350 before the waste gas enters the zeolite wheel concentration device 130, so that the adsorption capacity of the zeolite wheel concentration device 130 on the organic substances in the waste gas can be improved, and the removal efficiency of the organic substances in the waste gas can be further improved. In addition, the organic waste gas adsorption, desorption, concentration and purification system 3 according to the third embodiment of the present invention heats the waste gas in the waste gas inlet pipe 160 by using the waste heat of the tail gas from the incinerator outlet, without additionally installing a heating device and/or a pipeline, so that it has an advantage of reducing energy consumption, and in addition, it can reduce the pressure loss caused by additional components in the pipeline of the system, and can reduce the complexity of the system.

While the invention has been disclosed in terms of preferred embodiments, it will be understood by those skilled in the art that such embodiments are merely illustrative of the invention and should not be construed as limiting the scope of the invention. It should be noted that all changes and substitutions equivalent to the embodiments are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims (7)

1. The utility model provides an organic waste gas inhales concentrated clean system of desorption which characterized in that contains:
an incinerator having a combustion chamber;
a waste heat bypass heat exchanger connected to the combustion chamber to introduce high temperature gas of the combustion chamber for heat exchange;
the zeolite rotating wheel concentration device is provided with an adsorption area, a blowing area and a desorption area, wherein the inlet end of the adsorption area is connected with a waste gas inlet pipe, the outlet end of the adsorption area is connected with a chimney, the inlet end of the blowing area is used for inputting blowing gas flow, the outlet end of the blowing area is connected with the waste heat bypass heat exchanger, the blowing gas flows through the waste heat bypass heat exchanger to be heated and then is used as desorption gas flow and is input to the inlet end of the desorption area, and the outlet end of the desorption area is connected with the incinerator;
the temperature sensor is arranged at the inlet end of the waste gas inlet pipe close to the adsorption area and used for measuring the temperature in the waste gas inlet pipe; and
the temperature return humidity control unit is connected to the waste gas inlet pipe, high-temperature gas is led out from the incinerator by the temperature return humidity control unit to heat the waste gas in the waste gas inlet pipe, the flow of the led-out high-temperature gas is controlled according to the temperature measured by the temperature sensor, and the temperature return humidity control unit comprises:
the temperature returning heat exchanger is connected with the waste heat bypass heat exchanger, and high-temperature gas at the outlet of the waste heat bypass heat exchanger is introduced into the chimney and flows to the chimney after passing through the temperature returning heat exchanger;
the drainage pipeline is provided with an eduction pipe and a return pipe, two ends of the eduction pipe are connected with the inlet end of the adsorption area and the temperature return heat exchanger, and two ends of the return pipe are connected with the temperature return heat exchanger and the waste gas inlet pipe; and
and the circulating windmill is used for pumping and leading out a part of waste gas at the inlet end of the adsorption area to the temperature-returning heat exchanger through the leading-out pipe and conveying the waste gas subjected to heat exchange with high-temperature gas to the waste gas inlet pipe through the return pipe, and the circulating windmill determines the pumping flow according to the temperature measured by the temperature sensor.
2. The system for absorbing, desorbing, concentrating and purifying organic waste gas as claimed in claim 1, wherein a particulate filter is disposed in front of the inlet end of the adsorption zone for filtering particulate matters in the waste gas introduced from the waste gas inlet pipe.
3. The system of claim 1 or 2, wherein the incinerator is a direct-fired incinerator having a preheating heat exchanger connected to the combustion chamber, and the outlet of the desorption zone is connected to the preheating heat exchanger, the desorption gas flows to the combustion chamber after being preheated by the preheating heat exchanger, and after being combusted, the desorption gas flows into the preheating heat exchanger for heat exchange, the waste heat bypass heat exchanger is connected to the preheating heat exchanger, and the high temperature gas at the outlet of the preheating heat exchanger exchanges heat with the return heat exchanger through the waste heat bypass heat exchanger.
4. The system of claim 3, wherein the outlet of the combustion chamber is provided with a communicating tank, and the preheating heat exchanger, the waste heat bypass heat exchanger and the temperature recovery heat exchanger are adjacently disposed in the communicating tank.
5. The system for absorbing, desorbing, concentrating and purifying organic waste gas as claimed in claim 3, wherein a particulate filter is disposed in front of the inlet end of the adsorption zone for filtering particulate matters in the waste gas introduced from the waste gas inlet pipe.
6. The utility model provides an organic waste gas inhales concentrated clean system of desorption which characterized in that contains:
an incinerator having a combustion chamber;
a waste heat bypass heat exchanger connected to the combustion chamber to introduce high temperature gas of the combustion chamber for heat exchange;
the zeolite rotating wheel concentration device is provided with an adsorption area, a blowing area and a desorption area, wherein the inlet end of the adsorption area is connected with a waste gas inlet pipe, the outlet end of the adsorption area is connected with a chimney, the inlet end of the blowing area is used for inputting blowing gas flow, the outlet end of the blowing area is connected with the waste heat bypass heat exchanger, the blowing gas flows through the waste heat bypass heat exchanger to be heated and then is used as desorption gas flow and is input to the inlet end of the desorption area, and the outlet end of the desorption area is connected with the incinerator;
the temperature sensor is arranged at the inlet end of the waste gas inlet pipe close to the adsorption area and used for measuring the temperature in the waste gas inlet pipe; and
the temperature return humidity control unit is connected to the waste gas inlet pipe, high-temperature gas is led out from the incinerator by the temperature return humidity control unit to heat the waste gas in the waste gas inlet pipe, the flow of the led-out high-temperature gas is controlled according to the temperature measured by the temperature sensor, and the temperature return humidity control unit comprises:
a tail gas recovery pipeline, wherein the inlet end and the outlet end of the tail gas recovery pipeline are respectively connected with the exhaust pipeline of the incinerator and the waste gas inlet pipe;
the proportional control valve is arranged on the tail gas recovery pipe in an on-line manner, and proportionally controls the flow passing through the tail gas recovery pipe according to the temperature sensed by the temperature sensor; and
the counterweight type check air door is arranged on the exhaust pipe of the incinerator and close to the inlet end of the tail gas recovery pipeline, and the opening size of the counterweight type check air door is determined according to the air pressure in the exhaust pipe.
7. An organic waste gas adsorption and desorption concentration purification method of the organic waste gas adsorption and desorption concentration purification system according to any one of claims 1 to 6, which is used for treating waste gas containing organic substances, and is characterized in that the organic waste gas adsorption and desorption concentration purification method comprises the following steps:
a, introducing the waste gas into a zeolite rotating wheel concentration device through a waste gas inlet pipe, wherein the zeolite rotating wheel concentration device at least comprises an adsorption area and a desorption area, the inlet end of the adsorption area is connected with the waste gas inlet pipe, the outlet end of the adsorption area is connected with a chimney, the inlet end of the desorption area inputs desorption gas flow, the outlet end of the desorption area is connected with an incinerator, and the incinerator is used for incinerating the desorption gas flow from the desorption area;
b leading high-temperature gas of the incinerator to the waste gas inlet pipe, and heating waste gas in the waste gas inlet pipe, wherein the high-temperature gas is led out from a combustion chamber of the incinerator, or the high-temperature gas is tail gas at an outlet end of the incinerator;
c measuring the temperature in the exhaust gas inlet pipe;
d controlling the flow of the high-temperature gas drawn out from the incinerator according to the measured temperature; and
e repeating the steps b to d to increase the temperature of the exhaust gas in the exhaust gas inlet pipe to 20-40 ℃ and the relative humidity to be lower than 80%.
CN201410673481.2A 2014-11-20 2014-11-20 Organic waste gas adsorption, desorption, concentration and purification system and method thereof CN105597490B (en)

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