CN220090535U - No fan VOCs processing apparatus suitable for tank field exhales gas - Google Patents
No fan VOCs processing apparatus suitable for tank field exhales gas Download PDFInfo
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- CN220090535U CN220090535U CN202320613125.6U CN202320613125U CN220090535U CN 220090535 U CN220090535 U CN 220090535U CN 202320613125 U CN202320613125 U CN 202320613125U CN 220090535 U CN220090535 U CN 220090535U
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 239000003507 refrigerant Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 72
- 239000007789 gas Substances 0.000 abstract description 51
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 36
- 238000005086 pumping Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model discloses a fan-free VOCs treatment device suitable for tank field exhaled air, which comprises a low-temperature medium storage tank, a low-temperature pump, a VOCs condenser, a gas ejector, a VOCs condensate storage tank and tank field exhaled air, wherein a heat exchange coil is arranged in the low-temperature medium storage tank, the ejection pumping force of vaporized nitrogen is utilized to ensure that the air quantity is more stable to control, the cold quantity of the nitrogen generated by gasifying liquid nitrogen can be effectively stored and utilized, the device is used for treating the exhaled air containing the VOCs tank field, the VOCs components in the device are recovered, the load of a subsequent gas treatment device can be also realized while economic benefits are generated, and the energy consumption is reduced.
Description
Technical Field
The utility model relates to the field of volatile organic gas recovery, in particular to a fan-free VOCs treatment device suitable for tank farm exhaled breath.
Background
During routine tank farm preservation and handling operations, a significant amount of exhaled breath of the size containing VOCs is often generated. Because of the small amount of ventilation and large fluctuations, a suitable blower cannot be selected, typically a blower bypass loop, to adjust. In this way, not only is the control unstable, but the energy consumption is also high for the continuous operation. Meanwhile, due to the need of nitrogen seal, a large amount of liquid nitrogen is usually required to be vaporized in the tank area, and if a cold storage device is not provided, part of cold energy is wasted.
Disclosure of Invention
In view of the problems existing in the prior art, the utility model aims to provide an efficient and energy-saving fan-free VOCs treatment device suitable for tank farm exhaled breath.
The technical scheme of the utility model is as follows:
the utility model provides a no fan VOCs processing apparatus suitable for tank field exhales gas, includes cryogenic medium holding vessel, cryopump, VOCs condenser, gas ejector and VOCs condensate storage tank, be equipped with the heat exchange coil in the cryogenic medium holding vessel, the import and the cold source of heat exchange coil pass through the refrigerant inlet pipe and are connected, the export and the gas inlet at gas ejector top of heat exchange coil pass through the pipeline connection, gas ejector lateral part takes out the gas inlet and lets in the tank field exhales gas, gas ejector lateral part takes out the gas outlet and passes through the pipeline connection with the lateral part gas inlet of VOCs condenser;
the liquid outlet at the bottom of the low-temperature medium storage tank is divided into two paths, wherein the first path is as follows: the device is connected with an inlet of a low-temperature pump through a low-temperature medium discharging pipe, an outlet of the low-temperature pump is connected with a liquid inlet at the side part of a shell side of the VOCs condenser through a pipeline, and a liquid outlet at the bottom of the VOCs condenser is connected with a liquid inlet at the top of a VOCs condensate storage tank through a pipeline; and a liquid outlet at the side part of the VOCs condenser is connected with a liquid inlet at the side part of the low-temperature medium storage tank through a pipeline.
Further, the second path of the liquid outlet at the bottom of the cryogenic medium storage tank is: the device is connected with a liquid inlet at the side part of the VOCs condensate storage tank through a pipeline, and a liquid outlet at the side part of the VOCs condensate storage tank is connected with a downstream tank area through a condensate pipe.
Further, the side gas outlet of the VOCs condenser is connected to a downstream clean tank farm by a pipe.
Further, the heat source is connected with the heat exchange coil through a pipeline.
Further, a cold insulation layer is arranged outside the low-temperature medium storage tank, and the bottom of the low-temperature medium storage tank is of a conical structure; the heat exchange coil is a bare tube or a finned tube.
Further, the VOCs condenser adopts a vertical tube structure, and is externally provided with a cold insulation layer.
Further, a pressure difference alarm is arranged between the side gas inlet of the VOCs condenser and the side gas outlet of the VOCs condenser, and the pressure of the pressure difference alarm is 1-5 KPa.
Compared with the prior art, the utility model has the following beneficial effects:
compared with the prior art, the utility model eliminates the fan conveying equipment, ensures more stable air quantity control by utilizing the injection pumping force of the vaporized nitrogen, can effectively store and utilize the cold quantity of the nitrogen generated by the gasification of the liquid nitrogen, is used for treating the exhaled air of the VOCs-containing tank area, recovers the VOCs components therein, generates economic benefit, and can also reduce the load of a subsequent gas treatment device.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model.
In the figure: 1. a low temperature medium storage tank; 2. a cryogenic pump; 3. VOCs condenser; 4. a gas injector; 5. VOCs condensate storage tank; 6. the tank area exhales air; 7. a heat exchange coil; 8. a refrigerant feed pipe; 9. a low-temperature medium discharging pipe; 10. a condensate pipe; 11. a differential pressure alarm; side gas inlets of the N1 and VOCs condenser; side gas outlets of the N2 and VOCs condenser; liquid outlet at bottom of the condenser for N3 and VOCs; n4, a liquid inlet at the side part of the VOCs condenser; n5, a liquid outlet at the side part of the VOCs condenser; n6, a liquid outlet at the bottom of the low-temperature medium storage tank; and N7, a liquid inlet at the side part of the low-temperature medium storage tank.
Detailed Description
The utility model will be further described with reference to the accompanying drawings, but the scope of protection of the utility model is not limited to the described scope.
As shown in figure 1, a fan-free VOCs treatment device suitable for tank field exhaled breath comprises a low-temperature medium storage tank 1, a low-temperature pump 2, a VOCs condenser 3, a gas ejector 4, a VOCs condensate storage tank 5 and tank field exhaled breath 6, wherein a heat exchange coil 7 is arranged in the low-temperature medium storage tank 1, the heat exchange coil 7 is a bare pipe or a finned pipe, and the material of the heat exchange coil 7 is aluminum, copper or stainless steel; the VOCs condenser 3 adopts a vertical tube structure, and is externally provided with a cold insulation layer.
The inlet of the heat exchange coil 7 is connected with a cold source through a refrigerant feeding pipe 8, and the storage temperature of the low-temperature medium storage tank 1 is controlled by the output temperature of the low-temperature medium. The flow rate of the liquid nitrogen is controlled by the temperature of the gasified nitrogen. In order to prevent crystallization blockage, the bottom of the low-temperature medium storage tank 1 adopts a conical structure, so that the smoothness of sinking, conveying and circulation of liquid is ensured. In addition, a cold insulation layer is arranged outside the low-temperature medium storage tank 1.
The outlet of the heat exchange coil 7 is connected with a gas inlet at the top of the gas ejector 4 through a pipeline, a side air-pumping gas inlet of the gas ejector 4 is led into the tank area for exhaling gas 6, and a side air-pumping gas outlet of the gas ejector 4 is connected with a side air inlet N1 of the VOCs condenser through a pipeline.
The liquid outlet N6 at the bottom of the low-temperature medium storage tank is divided into two paths, wherein the first path is as follows: the liquid outlet N6 at the bottom of the low-temperature medium storage tank is connected with the inlet of the low-temperature pump 2 through a low-temperature medium discharging pipe 9, the outlet of the low-temperature pump 2 is connected with the liquid inlet N4 at the side part of the VOCs condenser through a pipeline, and the liquid outlet N3 at the bottom of the VOCs condenser is connected with the liquid inlet at the top of the VOCs condensate storage tank 5 through a pipeline; the liquid outlet N5 at the side of the VOCs condenser is connected with the liquid inlet N7 at the side of the low-temperature medium storage tank through a pipeline.
The second path of the liquid outlet N6 at the bottom of the low-temperature medium storage tank is as follows: the second path of the liquid outlet N6 at the bottom of the low-temperature medium storage tank is as follows: the device is connected with a liquid inlet at the side part of the VOCs condensate storage tank 5 through a pipeline, and a liquid outlet at the side part of the VOCs condensate storage tank 5 is connected with a downstream tank area through a condensate pipe 10; the gas outlet N2 at the side part of the VOCs condenser is connected with the downstream clean tank area through a pipeline.
A pressure difference alarm 11 is arranged between a side gas inlet N1 of the VOCs condenser and a liquid outlet N2 at the bottom of the low-temperature medium storage tank, and the pressure of the pressure difference alarm is 1-5 Kpa, so that the heat exchanger can be immediately found and subjected to temperature return treatment when the heat exchanger is frozen.
Comprises a heat source which is connected with a heat exchange coil 7 through a pipeline.
Specifically, the upstream liquid nitrogen is gasified in the heat exchange coil 7 of the low-temperature medium storage tank 1 to generate cold energy, and meanwhile, the temperature of the low-temperature medium is reduced, and the storage temperature of the low-temperature medium storage tank 1 is controlled by the output temperature of the low-temperature medium. The flow rate of the liquid nitrogen is controlled by the temperature of the gasified nitrogen;
the low-temperature medium after cooling is conveyed to the VOCs condenser 3 through the low-temperature pump 2, the tank field exhaled gas containing VOCs enters the heat exchange tube through the side gas inlet N1 of the VOCs condenser to cool and condense, and condensed organic liquid is downwards collected through the heat exchanger tube box to be collected into the VOCs condensate storage tank 5 under the action of gravity through the tube wall. And outputting the purified tail gas from a liquid outlet N2 at the bottom of the low-temperature medium storage tank. The low-temperature refrigerant is conveyed to a liquid inlet at the side part of the VOCs condenser at the lower part of the heat exchanger through the low-temperature pump 2, enters a shell side of the heat exchanger, exchanges heat with exhaled air of a tank area containing VOCs therein, and returns to the low-temperature medium storage tank 1 through a liquid outlet N5 at the side part of the VOCs condenser at the upper part of the heat exchanger after the temperature rises to exchange cold energy with liquid nitrogen so as to be cooled to a specified temperature, and is recycled. The inlet and outlet of the tube side of the VOCs condenser 3 are provided with a pressure difference alarm 11, and the model of the pressure difference alarm 11 is PDIA-003.
The purified tail gas can be conveyed back to the tank area as nitrogen seal or downstream treatment equipment, and the conveying pressure is provided due to the existence of the gas ejector 4, so that the device does not introduce a centrifugal fan.
Liquid nitrogen enters the low-temperature medium storage tank 1 through the refrigerant feed pipe 8 and the corresponding control valve TV001, is vaporized in the heat exchange coil 7 in the low-temperature medium storage tank 1, and enters the gas ejector 4 through the flow control valve. The temperature of the liquid nitrogen after vaporization is controlled by the feeding amount of the liquid nitrogen, so that the temperature is not too low; in the gas ejector 4, part of nitrogen is used for tank field nitrogen seal, and the other part is used as driving fluid to pump the exhalant gas of the tank field, so that the exhalant gas of the tank field can overcome pipeline resistance and enter the low-temperature treatment system device, and meanwhile, the temperature of the nitrogen just gasified is lower and is mixed with the exhalant gas of the original VOCs tank field, and the exhalant gas can be precooled to fully utilize the cold quantity of liquid nitrogen. The flow of cryogenic nitrogen is controlled by the pumping pressure (PT 003).
Examples
Exhaled tail gas from methanol tank area (15 ℃ C., normal pressure, content about 122 g/Nm) 3 The balance nitrogen), feed rate 300Nm 3 And/h. The adopted intermediate low-temperature medium is; the secondary refrigerant (freezing point below-65 ℃ C., methanol in the example).
The upstream liquid nitrogen is gasified in the heat exchange coil 7 in the low-temperature medium storage tank 1 to generate cold energy, and meanwhile, the temperature of the low-temperature medium is reduced, the storage temperature of the low-temperature medium storage tank 1 is controlled to be-45 ℃ to-55 ℃, and the storage temperature is controlled by the output temperature (T002) of the low-temperature medium. The flow rate of the liquid nitrogen is controlled by the temperature (T001) of gasified nitrogen, the feed flow rate is 129-150 kg/h, and the temperature of the output nitrogen is controlled at-80 to-100 ℃. In order to prevent crystallization blockage, the bottom of the low-temperature medium storage tank adopts a conical structure, so that the smoothness of sinking, conveying and circulation of liquid is ensured;
the cooled low-temperature medium is conveyed to a VOCs condenser 3 through a low-temperature pump 2, the VOCs condenser 3 adopts a vertical tube array structure, a cold insulation layer is arranged outside, a low-temperature refrigerant is conveyed to a liquid inlet N4 at the side part of the VOCs condenser through the low-temperature pump 2, enters a heat exchanger shell side, exchanges heat with exhaled air at a tank area containing the VOCs, and is returned to a low-temperature medium storage tank 1 through a liquid outlet N5 at the side part of the VOCs condenser when the temperature is increased to (-30 to-35 ℃), exchanges cold energy with liquid nitrogen so as to be cooled to a specified temperature, and is recycled;
the exhaled air of the tank area containing VOCs is mixed with the ejecting nitrogen and then enters the heat exchange tube through the side gas inlet N1 of the VOCs condenser to exchange heat with a low-temperature medium, the condensed organic liquid is condensed to-40 to-45 ℃, and the condensed organic liquid is collected downwards through the tube wall under the action of gravity and is collected into the VOCs condensate storage tank 5 through the tube box of the heat exchanger; the pressure difference alarm 11 is arranged at the inlet and outlet of the tube side of the VOCs condenser 3, the alarm pressure is set to be 1-5 kpa, and the heat exchanger can be immediately found and subjected to temperature return treatment when the heat exchanger is frozen. The purified tail gas is output from a liquid outlet N2 at the bottom of the low-temperature medium storage tank and is conveyed back to the tank area to serve as nitrogen seal or downstream treatment equipment, and the conveying pressure is provided due to the existence of the gas ejector 4, so that the device does not need to be introduced into a centrifugal fan;
liquid nitrogen enters the low-temperature medium storage tank 1 through the refrigerant feed pipe 8 and the corresponding control valve TV001, is vaporized in the heat exchange coil 7 in the low-temperature medium storage tank 1, and enters the gas ejector 4 through the flow control valve. The temperature after the vaporization of the liquid nitrogen is controlled by the feeding amount of the liquid nitrogen, the temperature is controlled to be-80 to-100 ℃, nitrogen is used as a driving fluid in the gas injector 4, the exhaled gas of the tank area is pumped, and the flow of the low-temperature nitrogen is controlled by the pumping pressure (PT 003) to ensure that the pressure is more than or equal to 2kpa;
the concentration of methanol in the tail gas treated by the method is lower than 2.5 g/Nm3, and the recovery rate of VOCs is more than or equal to 97 percent. The method effectively recovers the economic components, generates higher economic benefit, greatly reduces the operation load of the downstream tail gas treatment device and reduces the operation cost.
Claims (7)
1. The utility model provides a no fan VOCs processing apparatus suitable for tank field exhales gas, its characterized in that includes cryogenic medium holding vessel (1), cryogenic pump (2), VOCs condenser (3), gas ejector (4) and VOCs condensate storage tank (5), be equipped with heat exchange coil (7) in cryogenic medium holding vessel (1), the import and the cold source of heat exchange coil (7) are passed through refrigerant inlet pipe (8) and are connected, the export of heat exchange coil (7) passes through the pipeline with the gas inlet at gas ejector (4) top and is connected, gas ejector (4) lateral part bleed gas body entry lets in tank field exhales gas (6), gas ejector (4) lateral part bleed gas body export and VOCs condenser's lateral part gas inlet (N1) pass through the pipeline connection;
the liquid outlet (N6) at the bottom of the low-temperature medium storage tank is divided into two paths, wherein the first path is as follows: the device is connected with an inlet of a low-temperature pump (2) through a low-temperature medium discharging pipe (9), an outlet of the low-temperature pump (2) is connected with a liquid inlet (N4) at the side part of a shell side of a VOCs condenser through a pipeline, and a liquid outlet (N3) at the bottom of the VOCs condenser is connected with a liquid inlet at the top of a VOCs condensate storage tank (5) through a pipeline; the liquid outlet (N5) at the side part of the VOCs condenser is connected with the liquid inlet (N7) at the side part of the low-temperature medium storage tank through a pipeline.
2. A fan-less VOCs treatment apparatus for tank farm exhaled breath according to claim 1, wherein the second path of the liquid outlet (N6) at the bottom of the cryogenic medium storage tank is: the device is connected with a liquid inlet at the side part of the VOCs condensate storage tank (5) through a pipeline, and a liquid outlet at the side part of the VOCs condensate storage tank (5) is connected with a downstream tank area through a condensate pipe (10).
3. A fan-less VOCs treatment plant adapted for use with tank farm exhaled breath according to claim 2, characterised in that the side gas outlet (N2) of the VOCs condenser is connected to the downstream clean tank farm by a pipe.
4. A fan-less VOCs treatment plant adapted for tank farm exhaled breath according to claim 3, characterised in that it comprises a heat source connected by piping to the heat exchange coil (7).
5. The fan-free VOCs treatment device suitable for the exhaled breath of a tank farm according to claim 4 is characterized in that a cold insulation layer is arranged outside the cryogenic medium storage tank (1), and the bottom of the cold insulation layer is of a conical structure; the heat exchange coil (7) is a bare tube or a finned tube.
6. The fan-free VOCs treatment device suitable for the exhaled breath of the tank farm according to claim 5 is characterized in that the VOCs condenser (3) adopts a vertical tube array structure, and is externally provided with a cold insulation layer.
7. The fan-free VOCs treatment device suitable for the tank farm exhaled breath is characterized in that a pressure difference alarm (11) is arranged between a side gas inlet (N1) of the VOCs condenser and a side gas outlet (N2) of the VOCs condenser, and the pressure of the pressure difference alarm is 1-5 KPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320613125.6U CN220090535U (en) | 2023-03-27 | 2023-03-27 | No fan VOCs processing apparatus suitable for tank field exhales gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320613125.6U CN220090535U (en) | 2023-03-27 | 2023-03-27 | No fan VOCs processing apparatus suitable for tank field exhales gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220090535U true CN220090535U (en) | 2023-11-28 |
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ID=88846447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320613125.6U Active CN220090535U (en) | 2023-03-27 | 2023-03-27 | No fan VOCs processing apparatus suitable for tank field exhales gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220090535U (en) |
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2023
- 2023-03-27 CN CN202320613125.6U patent/CN220090535U/en active Active
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