CN111219723A - VOC waste gas non-adsorption and non-desorption direct catalytic combustion treatment equipment and method - Google Patents

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a VOC waste gas non-absorption and non-desorption direct catalytic combustion treatment device and a method. The energy of the invention is recycled and supplied by energy recovery generated by VOC waste gas oxidation, thus avoiding energy waste.

Description

VOC waste gas non-adsorption and non-desorption direct catalytic combustion treatment equipment and method

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a VOC waste gas non-adsorption and non-desorption direct catalytic combustion treatment device and a method.

Background

Can produce waste gas at industrial production's in-process, waste gas directly discharges away and can cause the pollution to the environment, needs handle, if exhaust-gas treatment does not reach standard, can cause the pollution to the surrounding environment, also can influence the producer and continue production, for this reason, we propose kind of VOC waste gas and do not have direct catalytic combustion treatment equipment and method of desorption.

Disclosure of Invention

The invention aims to provide equipment and a method for directly catalyzing and burning VOC waste gas without adsorption and desorption, so as to solve the technical problems.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a VOC waste gas does not have direct catalytic combustion treatment facility of desorption of inhaling, includes the heat exchanger, its characterized in that, the heat exchanger on be equipped with cold side air inlet, cold side gas outlet, hot side air inlet and hot side gas outlet, the cold side air inlet connect and be equipped with first fan, the heat exchanger side be equipped with the catalysis and fire burning furnace, the catalysis fire burning furnace on be equipped with gas inlet and gas outlet, gas inlet pass through the pipeline and be connected with the hot side gas outlet, gas outlet pass through the pipeline and be connected with the hot side air inlet, the hot side gas outlet pass through pipe connection to be equipped with the second fan, still be equipped with the motor, the motor provide whole equipment power.

Further, the cold side air inlet is provided with a filter through a pipeline.

And a flame arrester is arranged between the cold-side air inlet and the filter.

And a safe emptying adjusting electromagnetic valve is arranged between the catalytic combustion furnace and the hot-side air inlet.

And an electric heating device is further arranged between the hot-side air outlet and the catalytic combustion furnace.

Further, the heating device is connected with a controller through a wire, and an alarm is arranged on the controller.

Further arranged, the controller is connected with the filter, the flame arrester, the safe emptying adjusting electromagnetic valve, the alarm, the electric heating device and the motor through leads

A VOC waste gas non-adsorption and desorption direct catalytic combustion treatment method comprises the following steps:

s1: filtering the VOC waste gas by a filter under the action of a first fan to filter particulate impurities;

s2: the VOC waste gas treated by S1 enters a flame arrester to ensure safety;

s3: the VOC waste gas passing through S2 enters a heat exchanger for preheating, and the temperature is preheated to 200-250 ℃;

s4: the VOC waste gas finished by S3 enters a catalytic combustion furnace with a catalyst for low-temperature oxidation, more than 95% of the VOC waste gas is converted into CO2 and H2O (called hot flue gas), and because a large amount of heat is released by oxidation reaction, the temperature of the treated air (called hot flue gas) containing CO2 and H2O is continuously increased to 20-180 ℃;

s5: and (2) enabling the flue gas generated after the S4 treatment to enter a heat exchanger of S3 and cooling to 30-80 ℃, successfully recovering the waste heat of hot flue gas (CO2 and H2O are called as hot flue gas) with high efficiency, successfully preheating the VOC waste gas in the S2 to a preset temperature, greatly reducing the energy consumption required for heating the VOC waste gas in the second step, and realizing real energy conservation.

S6: the cooled flue gas (qualified flue gas which can be discharged contains CO2 and H2O) is discharged through a second fan.

Compared with the prior art, the invention has the beneficial effects that: the absorption and desorption-free direct catalytic combustion reduces the use of resources: on one hand, the heat exchanger preheats the VOC waste gas entering from the first inlet and cools the treated waste gas from the second inlet; the energy of the invention is recycled and supplied by energy recovery generated by VOC waste gas oxidation, thus avoiding energy waste.

Drawings

Fig. 1 is a schematic diagram of a system configuration.

Fig. 2 is a flowchart.

1. A heat exchanger; 2. a cold side air inlet; 3. a hot side air outlet; 4. a hot side air inlet; 5. a cold side gas outlet; 6. a catalytic combustion furnace; 7. a gas inlet; 8. a gas outlet; 9. a first fan; 10. a second fan; 11. a motor; 12. a controller; 13. an electric heating device; 14. a flame arrestor; 15. and (4) safely emptying the adjusting electromagnetic valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a VOC waste gas non-absorption and non-desorption direct catalytic combustion processing device comprises a heat exchanger 1 and a controller 12, wherein the heat exchanger 1 is connected with the controller 12 through a lead, and the VOC waste gas non-absorption and non-desorption direct catalytic combustion processing device is characterized in that a cold side air inlet 2, a hot side air outlet 3, a hot side air inlet 4 and a cold side air outlet 5 are arranged on the heat exchanger 1, a first fan 9 is connected with the cold side air inlet 2, a catalytic combustion furnace 6 is arranged on the side surface of the heat exchanger 1, a gas inlet 7 and a gas outlet 8 are arranged on the catalytic combustion furnace 6, the gas inlet 7 is connected with the hot side air outlet 3 through a pipeline, the gas outlet 8 is connected with the hot side air inlet 4 through a pipeline, an air outlet is arranged on the catalytic combustion furnace 6, the air outlet is connected with the hot side, and a motor 11 is also arranged, and the motor 11 provides power for the whole equipment.

Further setting, cold side air inlet 3 be equipped with the filter through the pipe connection, carry out prefilter to waste gas, filter particulate matter. The filter may be disposed in front of the first fan or behind the first fan.

Further, a flame arrester 14 is arranged between the cold-side air inlet 3 and the filter, so that internal gas can be prevented from flowing back.

Further, a safe emptying adjusting electromagnetic valve 15 is arranged between the catalytic combustion furnace 6 and the hot-side air inlet 4, and can be opened when the internal temperature is too high to control the temperature.

Further, an electric heating device 13 is arranged between the hot side air outlet and the catalytic combustion furnace 6, and the electric heating device 13 can be started when the heat supply is insufficient.

Further, the heating device 13 is connected with a controller 12 through a lead, the controller is provided with an alarm, and the alarm is a temperature and pressure alarm

Further, the controller 12 is connected with the filter, the flame arrester 14, the safe emptying adjusting electromagnetic valve 15, the alarm, the electric heating device 13 and the motor 11 through leads.

A VOC waste gas non-adsorption and desorption direct catalytic combustion treatment method comprises the following steps:

s1: filtering the VOC waste gas by a filter under the action of a first fan 9 to filter particulate impurities;

s2: the VOC waste gas treated by S1 enters the flame arrester 14, so that safety is ensured;

s3: the VOC waste gas passing through S2 enters a heat exchanger 1 for preheating, and the temperature is preheated to 200-250 ℃;

s4: the VOC waste gas finished by S3 enters a catalytic combustion furnace 6 with a catalyst for low-temperature oxidation, more than 95% of the VOC waste gas is converted into CO2 and H2O (called hot flue gas), and because a large amount of heat is released by oxidation reaction, the temperature of the treated air (called hot flue gas) containing CO2 and H2O is continuously increased to 20-180 ℃;

s5: and (2) enabling the flue gas generated after the S4 treatment to enter a heat exchanger of S3 and cooling to 40-80 ℃, successfully recovering the waste heat of hot flue gas (CO2 and H2O are called as hot flue gas) with high efficiency, successfully preheating the VOC waste gas in the S2 to a preset temperature, greatly reducing the energy consumption required for heating the VOC waste gas in the second step, and realizing real energy conservation.

S6: the cooled flue gas (which may be discharged as qualified flue gas containing CO2 and H2O) is vented by the second fan 10.

The working principle of the system is as follows:

one, start up

1. When the air conditioner is started, the second fan is started firstly;

2. after 120 seconds, adjusting the air quantity of the second fan to 1/3, starting the catalytic combustion furnace for heating, and simultaneously starting the electric heating device;

3. when the temperature T1 of the gas inlet 7 of the catalytic combustion furnace reaches 230 ℃, starting a first fan W1;

4. the gas outlet temperature T2 of the catalytic combustion furnace is interlocked with a safety emptying adjusting electromagnetic valve N3/a first fan W1:

a. when the gas outlet temperature T2 of the catalytic combustion furnace reaches 275 ℃, selectively closing heating groups (10KW x 2, 20KW x 2, 50KW and 100KW heating groups) in catalytic combustion to adjust the gas outlet temperature T2 of the catalytic combustion furnace, and ensuring that the temperature is 275 ℃ to less than or equal to T2 to 280 ℃; (general considerations may eventually be taken into account for 20KW-50KW)

b. When the heating group and the electric heating device in the catalytic combustion are all closed, the gas outlet temperature T2 of the chemical combustion furnace still continuously rises to be more than or equal to 281 ℃, the safe emptying adjusting electromagnetic valve N3 is controlled, and the air volume of the safe emptying adjusting electromagnetic valve N3 is increased; if the temperature T2 of the gas outlet of the catalytic combustion furnace is less than or equal to 275 ℃, reducing the air quantity of a safe emptying regulating electromagnetic valve N3; until T2 is within control range; if the N3 is fully opened, and when the T2 is higher than 285 ℃, the next step is carried out;

c. and when the gas outlet temperature T2 of the catalytic combustion furnace still continuously rises to 285 ℃, controlling the first fan W1 to reduce the first W1 intake air volume until the gas outlet temperature T2 of the catalytic combustion furnace is in the control range.

d. After the operation is carried out, the gas outlet temperature T2 of the catalytic combustion furnace still continues to rise and is higher than 290 ℃, a fault audible and visual alarm is sent, the first fan W1 is turned off, and the furnace is stopped emergently.

e. When stopped, the first fan W1 is held in a fully open position.

5. The pressure P of the catalytic combustion furnace is interlocked with a safe emptying adjusting electromagnetic valve N3/a first fan W1, when the pressure P of the catalytic combustion furnace is more than or equal to 0.2MPa, the safe emptying adjusting electromagnetic valve N3 is opened, when the pressure P of the catalytic combustion furnace is more than or equal to 0.22MPa, the first fan W1 is reduced until the first fan W1 is stopped, and when the pressure P of the catalytic combustion furnace is more than or equal to 0.25MPa, a fault sound-light alarm is sent out, and the furnace is stopped emergently; when P is less than or equal to 0.2MPa,

gradually starting up the first fan W1 until the fan is fully started; when shutdown, the first W1 remains in the fully open position.

Second, halt

When the machine is stopped, the heating is stopped firstly, and when the gas outlet temperature T2 of the catalytic combustion furnace is reduced to 100 ℃, other controls recover the initial state and stop the operation of the fan.

Example 1

The principle is as follows: the normal-temperature VOC organic gas is preheated to 230 ℃ by using high-temperature (280 ℃) flue gas at the outlet of the catalytic combustion furnace, enters the catalytic combustion furnace for catalytic combustion, and supplements electric heating heat by using heat emitted by combustion reaction, so that the temperature of the flue gas at the outlet of the catalytic combustion furnace is kept at 280 ℃, and the system stably operates.

Calculation of the amount of heat absorbed or released by the air as its temperature increases or decreases

1. Setting:

air flow rate: v is 20000m 3/h;

air density (25 ℃, 1 atm): 1.293kg/m3 needs to compensate air heat loss, Q loss is 1225143360 joules/h 340.31KW

The temperature difference generated by the heat loss of the air needs to be compensated: delta T47 deg.C

Converting the compensation heating power by using an electric heating wire: the heating efficiency of the electric heating wire is 90 percent

Electricity consumption 60KW heats 20000m3 air:

Q＝CMΔT＝4.2*1000*M*ΔT

can raise the temperature of the compensating air to 7 DEG C

Calculation of combustion heat of waste gas (toluene, xylene, etc.)

Setting: 3 groups of color printers produce 4 colors of medium-load production every day,

using ink: 16.5 barrels, 15kg of each barrel,

the amount of solvent used: 200 kg;

the ink comprises the following components:

xylene: 5 percent; ethyl acetate: 10 percent; butanone: 5 percent; toluene: 40 percent of

Solvent components: toluene: 100 percent

The combustion value is obtained by checking: xylene: 43045.34 kj/kg;

ethyl acetate: 17272.86 kj/kg;

butanone: 23918.11 kj/kg;

toluene: 42445.65 kj/kg;

and (3) calculating: burn value of solvent volatilized in ink per hour:

1. xylene: 43045.34 × 5 × 16.5 × 15/10 ═ 53268.43kj/h

2. Ethyl acetate: 17272.86 × 10 × 16.5 × 15/10 ═ 42750.18kj/h3, butanone: 23918.11 × 5 × 16.5 × 15/10 ═ 29598.52kj/h

4. Toluene: 42445.65, 16.5, 15/10, 420211.93kj/h solvent burn value 545829.06kj/h volatilized per hour of ink

And (3) calculating: solvent fuel value

Setting: the amount of solvent consumed per day that is actually effectively discharged into the system: 80 percent of

Namely: 200kg by 80% — 160kg, calculated 10 hours per day, per hour: 16kg hourly solvent burning value 42445.65 16 679130.4kj/h

Conversion to J/S340266.67J/S

Conversion success rate KW 340.27KW

20000m3 air can be heated to generate a 47 ℃ temperature difference.

Thirdly, preheating air entering the catalytic combustion furnace to the highest temperature: 230 ℃, highest temperature of flue gas out of the catalytic combustion furnace: 280 ℃, temperature difference to be compensated: 50 deg.C

Fourth, conclusion

The heat generated by the combustion of waste gas and the heat generated by the heating of the electric furnace wire are not less than

The heat loss of the system and the heat taken away by the discharge can reduce the electricity consumption required by electric heating if the concentration of the waste gas exceeds the set concentration, and the system can also operate even without heating by a heating wire.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims (8)

1. The utility model provides a VOC waste gas does not have direct catalytic combustion treatment facility of desorption of inhaling, includes the heat exchanger, its characterized in that, the heat exchanger on be equipped with cold side air inlet, cold side gas outlet, hot side air inlet and hot side gas outlet, the cold side air inlet connect and be equipped with first fan, the heat exchanger side be equipped with the catalysis and fire burning furnace, the catalysis fire burning furnace on be equipped with gas inlet and gas outlet, gas inlet pass through the pipeline and be connected with the hot side gas outlet, gas outlet pass through the pipeline and be connected with the hot side air inlet, the hot side gas outlet pass through pipe connection to be equipped with the second fan, still be equipped with the motor, the motor provide whole equipment power.

2. The VOC waste gas non-absorption and desorption direct catalytic combustion treatment device as claimed in claim 1, wherein the cold side air inlet is connected with a filter through a pipeline.

3. The VOC waste gas non-adsorption and desorption direct catalytic combustion treatment device as claimed in claim 2, wherein a flame arrester is arranged between the cold-side air inlet and the filter.

4. The VOC exhaust gas non-adsorption and desorption direct catalytic combustion processing apparatus according to claim 1, wherein a safety vent adjusting solenoid valve is provided between the catalytic combustion furnace and the hot side air inlet.

5. The VOC exhaust gas non-absorption desorption direct catalytic combustion treatment apparatus according to claim 1, wherein an electric heating device is further provided between the hot side air outlet and the catalytic combustion furnace.

6. The VOC waste gas non-absorption and desorption direct catalytic combustion treatment equipment according to claim 5, wherein the heating device is connected with a controller through a wire, and the controller is provided with an alarm.

7. The VOC waste gas non-absorption and desorption direct catalytic combustion treatment equipment according to claim 6, wherein the controller is connected with the filter, the flame arrester, the safe emptying adjusting electromagnetic valve, the alarm, the electric heating device and the motor through leads.

8. The method for treating VOC waste gas by direct catalytic combustion without desorption according to any one of claims 1-6, wherein the method comprises the following steps: the method comprises the following steps:

s1: filtering the VOC waste gas by a filter under the action of a first fan to filter particulate impurities;

s2: the VOC waste gas treated by S1 enters a flame arrester to ensure safety;

s3: the VOC waste gas passing through S2 enters a heat exchanger for preheating;

s4: the VOC waste gas finished by the step S3 enters a catalytic combustion furnace with a catalyst for low-temperature oxidation; more than 95% of VOC waste gas is converted into CO2 and H2O (called hot flue gas), and a large amount of heat is released by oxidation reaction, so that the temperature of the treated air (called hot flue gas) containing CO2 and H2O is continuously increased;

s5: the flue gas generated after the S4 treatment enters a heat exchanger of S3 and is cooled, the waste heat of hot flue gas (CO2 and H2O are called as hot flue gas) is successfully and efficiently recovered, and the VOC waste gas in S2 is successfully preheated to a preset temperature:

s6: the cooled flue gas (qualified flue gas which can be discharged contains CO2 and H2O) is discharged through a second fan.

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