Tank field waste gas recovery device

Abstract

A tank field waste gas recovery device belongs to the technical field of chemical tail gas treatment. Comprising a butyraldehyde storage tank, a cooler, a packing absorption tower and an RTO waste gas treatment device, a breather valve is arranged at the top of the butyraldehyde storage tank, a heat insulation structure is further arranged on the upper side of the butyraldehyde storage tank, an outlet of the breather valve is communicated with the bottom of the packing absorption tower, and a cold octanol outlet of the cooler is communicated with the upper portion of the packing absorption tower. And a top outlet of the packing absorption tower is communicated with the RTO waste gas treatment device. A heat insulation structure is additionally arranged on the tank top of the butyraldehyde storage tank to reduce the influence of heat radiation, and butyraldehyde volatilization is reduced. Volatilized butyraldehyde enters from the bottom of the packing absorption tower, cooled octanol enters from the top of the packing absorption tower, gas containing butyraldehyde is sprayed, butyraldehyde components in the tank field waste gas are removed, and the waste gas with butyraldehyde removed enters an RTO waste gas treatment device to be treated. Peculiar smell in a tank area is effectively reduced, and the pressure and temperature of the butyraldehyde storage tank are kept stable.

Description

Technical Field

[0001] The invention discloses a tank area waste gas recovery device, belonging to the technical field of chemical tail gas treatment. Background Art

[0002] Butyraldehyde storage tanks are generally fixed-roof storage tanks, and the butyraldehyde medium inside them is easy to volatilize, especially in the high temperature in summer, which is more likely to cause large fluctuations in the temperature and pressure of the storage tank, resulting in a strong environmental odor on site; the butyraldehyde tank area has a large material storage volume and a low boiling point of butyraldehyde. The volatile butyraldehyde gas causes a strong odor in the tank area. The butyraldehyde odor threshold is extremely low (0.00045--0.00085ppm), and the odor risk is relatively high, which brings obstacles to the construction of odor-free factories. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the deficiencies of the existing technology and provide a tank area waste gas recovery device to effectively remove butyraldehyde organic matter entrained in the gas phase components of the tank area and reduce the risk of odor.

[0004] The technical solution adopted by the utility model to solve its technical problems is: the tank area waste gas recovery device includes a butyraldehyde storage tank, a cooler, a packed absorption tower and an RTO waste gas treatment device, a breathing valve is provided on the top of the butyraldehyde storage tank, and a heat insulation structure is also provided on the upper side of the butyraldehyde storage tank, the outlet of the breathing valve is connected to the bottom of the packed absorption tower, the cold octanol outlet of the cooler is connected to the upper part of the packed absorption tower, and the top outlet of the packed absorption tower is connected to the RTO waste gas treatment device.

[0005] Preferably, the thermal insulation structure includes a thermal insulation layer, which is coated on the top of the butyraldehyde storage tank.

[0006] Preferably, the thermal insulation structure further includes a top plate, which is fixed to the top of the butyraldehyde storage tank through a plurality of fixing columns, and the top plate is spaced apart on the upper side of the thermal insulation layer.

[0007] Preferably, the method further comprises an octanol distillation device, which is connected to the hot octanol inlet of the cooler and the bottom outlet of the packed absorption tower.

[0008] Preferably, the octanol distillation device comprises an octanol distillation tower and an octanol pre-distillation tower, the octanol distillation tower is connected to the hot octanol inlet of the cooler, and the octanol pre-distillation tower is connected to the bottom outlet of the packed absorption tower.

[0009] Preferably, an octanol delivery pump is provided on the pipeline between the bottom outlet of the packed absorption tower and the octanol pre-distillation tower.

[0010] Preferably, the outlet of the octanol pre-distillation tower is connected to the inlet of the octanol distillation tower.

[0011] Preferably, a butyraldehyde waste gas pressure stabilizing mechanism is provided on the pipeline between the breathing valve and the packed absorption tower.

[0012] Preferably, the butyraldehyde waste gas pressure stabilizing mechanism includes a buffer tank and a throttle valve, which are arranged in sequence from the breathing valve to the packed absorption tower, and the buffer tank is provided with a safety valve and an air intake check valve.

[0013] Preferably, the butyraldehyde storage tank includes a mixed butyraldehyde storage tank and an isobutyraldehyde storage tank, and the breathing valve on the top of the mixed butyraldehyde storage tank and the isobutyraldehyde storage tank is arranged in parallel.

[0014] Compared with the existing technology, the above technical solution of the tank area waste gas recovery device has the following beneficial effects:

[0015] Thermal insulation has been added to the top of the butyraldehyde storage tank to reduce the effects of thermal radiation and minimize butyraldehyde volatilization. Volatized butyraldehyde enters the bottom of the packed absorption tower, while cooled octanol enters the top. This sprays the butyraldehyde-containing gas, removing butyraldehyde components from the tank area's exhaust gas. The resulting exhaust gas then enters the RTO waste gas treatment unit for treatment. This effectively reduces odor in the tank area and maintains stable pressure and temperature in the butyraldehyde storage tanks.

[0016] The butyraldehyde organic matter carried in the gas phase components of the tank area is removed, the lower explosion limit of the RTO waste gas treatment device is lowered, the non-methane total hydrocarbon content of the RTO waste gas treatment device is reduced, and the long-term operation of the RTO waste gas treatment device can be stabilized, solving the safety and environmental protection problems in the operation process of the RTO waste gas treatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the waste gas recovery device in the tank area.

[0018] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0019] Among them: 1. mixed butyraldehyde storage tank 2, isobutyraldehyde storage tank 3, breathing valve 4, buffer tank 5, throttle valve 6, packed absorption tower 7, cooler 8, octanol distillation tower 9, RTO waste gas treatment device 10, octanol pre-distillation tower 11, octanol delivery pump 12, thermal insulation layer 13, top plate 14, fixed column. DETAILED DESCRIPTION

[0020] Figures 1-2 This is the best embodiment of the waste gas recovery device in the tank area. Figures 1-2 The utility model is further described.

[0021] Reference Figure 1The tank area waste gas recovery device includes a butyraldehyde storage tank, a cooler 7, a packed absorption tower 6 and an RTO waste gas treatment device 9. A breathing valve 3 is provided on the top of the butyraldehyde storage tank, and the outlet of the breathing valve 3 is connected to the bottom of the packed absorption tower 6. The cold octanol outlet of the cooler 7 is connected to the upper part of the packed absorption tower 6, and the top outlet of the packed absorption tower 6 is connected to the RTO waste gas treatment device 9.

[0022] The butyraldehyde storage tank in this embodiment includes a mixed butyraldehyde storage tank 1 and an isobutyraldehyde storage tank 2, and the breathing valve 3 at the top of the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2 is arranged in parallel. In addition, a butyraldehyde waste gas pressure stabilizing mechanism is provided on the pipeline between the breathing valve 3 at the top of the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2 and the packed absorption tower 6. The butyraldehyde waste gas stabilizing mechanism allows butyraldehyde to enter the packed absorption tower 6 stably, ensuring that the butyraldehyde is fully processed, avoiding large-scale fluctuations in butyraldehyde causing waste of processing raw materials or butyraldehyde entering the RTO waste gas treatment device directly without being processed.

[0023] Specifically, the butyraldehyde waste gas pressure stabilization mechanism includes a buffer tank 4 and a throttle valve 5, which are arranged in sequence from the breathing valve 3 to the packed absorption tower 6. The buffer tank 4 is equipped with a safety valve and an air intake check valve. The safety valve is used to relieve pressure when the butyraldehyde gas volume is very large to ensure safety. The air intake check valve is used to inject air into the breathing valve through the air intake check valve when the temperature in the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2 drops and air needs to be admitted, thereby preventing a large negative pressure from forming inside the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2.

[0024] The tank farm waste gas recovery unit also includes an octanol distillation unit, which is connected to the hot octanol inlet of cooler 7 and the bottom outlet of packed absorption tower 6. Specifically, the octanol distillation unit includes an octanol distillation tower 8 and an octanol pre-distillation tower 10. The octanol distillation tower 8 is connected to the hot octanol inlet of cooler 7, and the octanol pre-distillation tower 10 is connected to the bottom outlet of packed absorption tower 6. An octanol delivery pump 11 is provided on the pipeline between the bottom outlet of packed absorption tower 6 and the octanol pre-distillation tower 10. The outlet of the octanol pre-distillation tower 10 is connected to the inlet of the octanol distillation tower 8.

[0025] See also Figure 2 A thermal insulation structure is also provided on the upper side of the butyraldehyde storage tank. The thermal insulation structure includes a thermal insulation layer 12, which is coated on the top of the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2. The thermal insulation structure in this embodiment also includes a top plate 13, which is fixed to the top of the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2 by a plurality of fixing columns 14, and the top plate 13 is spaced apart on the upper side of the thermal insulation layer 12. The thermal insulation layer 12 and the top plate 13 reduce the impact of heat radiation and reduce the volatilization of butyraldehyde.

[0026] Working process: The volatilized butyraldehyde in the mixed butyraldehyde storage tank 1 and the isobutyraldehyde storage tank 2 is discharged into the buffer tank 4 through the breathing valve. The butyraldehyde in the buffer tank 4 enters the packed absorption tower 6 after passing through the throttle valve. Butyraldehyde enters from the bottom of the packed absorption tower 6, and the cooled octanol enters from the top of the packed absorption tower 6. The gas containing butyraldehyde is sprayed, and the butyraldehyde components in the tank area exhaust gas are removed. The exhaust gas after butyraldehyde removal enters the RTO exhaust gas treatment device 9 for treatment. It effectively reduces the odor in the tank area and maintains the pressure and temperature of the butyraldehyde storage tank stable. It removes the butyraldehyde organic matter entrained in the gas phase components of the tank area, reduces the lower explosion limit of the RTO exhaust gas treatment device 9, reduces the non-methane total hydrocarbon content of the RTO exhaust gas treatment device 9, can stabilize the long-term operation of the RTO exhaust gas treatment device 9, and solves the safety and environmental protection problems during the operation of the RTO exhaust gas treatment device 9.

[0027] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A tank area waste gas recovery device, characterized by: The invention comprises a butyraldehyde storage tank, a cooler, a packed absorption tower and an RTO waste gas treatment device. A breathing valve is provided on the top of the butyraldehyde storage tank, and an insulation structure is also provided on the upper side of the butyraldehyde storage tank. The outlet of the breathing valve is connected to the bottom of the packed absorption tower, the cold octanol outlet of the cooler is connected to the upper part of the packed absorption tower, and the top outlet of the packed absorption tower is connected to the RTO waste gas treatment device.

2. The tank area waste gas recovery device according to claim 1, characterized in that: The thermal insulation structure includes a thermal insulation layer, which is coated on the top of the butyraldehyde storage tank.

3. The tank area waste gas recovery device according to claim 2, characterized in that: The heat insulation structure further includes a top plate, which is fixed to the top of the butyraldehyde storage tank through a plurality of fixing columns, and the top plate is spaced apart and arranged on the upper side of the heat insulation layer.

4. The tank area waste gas recovery device according to claim 1, characterized in that: The invention also comprises an octanol distillation device, which is connected to the hot octanol inlet of the cooler and the bottom outlet of the packed absorption tower.

5. The tank area waste gas recovery device according to claim 4, characterized in that: The octanol distillation device comprises an octanol distillation tower and an octanol pre-distillation tower. The octanol distillation tower is connected to the hot octanol inlet of the cooler, and the octanol pre-distillation tower is connected to the bottom outlet of the packed absorption tower.

6. The tank area waste gas recovery device according to claim 5, characterized in that: An octanol delivery pump is provided on the pipeline between the bottom outlet of the packed absorption tower and the octanol pre-distillation tower.

7. The tank area waste gas recovery device according to claim 5, characterized in that: The outlet of the octanol pre-distillation tower is connected to the inlet of the octanol distillation tower.

8. The tank area waste gas recovery device according to claim 1, characterized in that: A butyraldehyde waste gas pressure stabilizing mechanism is provided on the pipeline between the breathing valve and the packed absorption tower.

9. The tank area waste gas recovery device according to claim 8, characterized in that: The butyraldehyde waste gas pressure stabilizing mechanism includes a buffer tank and a throttle valve, which are arranged in sequence from the breathing valve to the packed absorption tower. The buffer tank is provided with a safety valve and an air intake one-way valve.

10. The tank area waste gas recovery device according to claim 1, characterized in that: The butyraldehyde storage tank comprises a mixed butyraldehyde storage tank and an isobutyraldehyde storage tank, and the breathing valve on the top of the mixed butyraldehyde storage tank and the isobutyraldehyde storage tank is arranged in parallel.

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