CN212510484U - Recycling device for tank field tail gas or process tail gas - Google Patents
Recycling device for tank field tail gas or process tail gas Download PDFInfo
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- CN212510484U CN212510484U CN202021641966.0U CN202021641966U CN212510484U CN 212510484 U CN212510484 U CN 212510484U CN 202021641966 U CN202021641966 U CN 202021641966U CN 212510484 U CN212510484 U CN 212510484U
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Abstract
The utility model provides a cyclic utilization device of tank field tail gas or technology tail gas which characterized in that: comprises a storage tank or a pressurized nitrogen discharging container, a buffer tank, a compressor, a condenser and a nitrogen recovery tank; the inlet of the buffer tank is connected with a storage tank or a pressurized nitrogen discharging container, and the outlet of the buffer tank is connected with a compressor; the compressor is connected with the condenser; the condenser is provided with a tail gas inlet, a tail gas outlet, a condensate discharge port, a cooling medium inlet and a cooling medium outlet, the tail gas inlet is connected with the compressor, and the tail gas outlet is connected with the inlet of the nitrogen recovery tank; the nitrogen recovery tank is provided with an inlet, a fresh compressed nitrogen inlet, a circulating nitrogen outlet and a discharge port, and the circulating nitrogen outlet is connected with a storage tank or a pressurized nitrogen discharge container. The utility model discloses can not discharge or greatly reduced exhaust emissions, consequently can reduce operating cost, save the nitrogen gas quantity, and safe and reliable.
Description
Technical Field
The utility model discloses a cyclic utilization device of tank field tail gas or pressurization nitrogen gas discharge container technology tail gas.
Background
In the production process of petroleum, chemical, light industry and pharmaceutical enterprises, storage tanks are often adopted to store raw materials, intermediate products and products, and in order to prevent air from entering the storage tanks, the storage tanks need to be kept to operate under micro-positive pressure (0.2-10 kPa). Fluctuations in the pressure within the tank, which are often regulated by means of a breather valve, can occur as a result of changes in the air temperature or the liquid level within the tank. For example, when the temperature is low at night and the pressure in the tank is reduced, nitrogen needs to be supplemented into the tank, and when the temperature is increased in daytime and the pressure is increased, the gas needs to be discharged; or the liquid level in the tank is reduced, the gas phase pressure is reduced, nitrogen needs to be supplemented, the liquid level is increased, the gas phase pressure is increased, and tail gas needs to be discharged. The medium in the storage tank often contains some volatile substances, so that the discharged gas contains volatile substances (such as VOC), the direct discharge does not meet the environmental protection requirement, the environment is polluted, and the part of tail gas must be treated.
Some process materials need to be supplemented with nitrogen for pressurized conveying. When materials in a container (tank or kettle) need to be conveyed, pressurized nitrogen is input into the container, after the materials are conveyed, the gas in the container needs to be discharged, and the generated exhaust process tail gas often contains volatile substances (such as VOC) and is directly discharged to pollute the environment and needs to be treated.
The existing treatment method of tank area tail gas or process tail gas comprises condensation adsorption, absorption, membrane separation, catalytic combustion, thermal combustion and the like, and due to the characteristics of intermittent emission or large flow change of the tail gas, low concentration of volatile substances, low boiling point and the like, the adopted treatment device has the problems of complex equipment, high operation cost, non-ideal treatment effect, safety and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a tail gas pressurization cyclic utilization device can not discharge or greatly reduced exhaust emissions, consequently can reduce operating cost, saves the nitrogen gas quantity, and safe and reliable.
The main contents of the utility model are: the tail gas from the tank area or the technological process is collected in the buffer tank in a centralized mode, the micro-positive pressure of the buffer tank is controlled, when the pressure of the buffer tank rises, the compressor is started, and the pressurized and heated gas is sent to the cooler. The cooler is cooled with a cooling medium (such as chilled water) to remove some of the higher boiling components in the vapor phase. The cooled gas phase enters a nitrogen recovery tank. When the tank farm storage or process requires pressurized nitrogen, the nitrogen recovery tank is replenished with pressurized nitrogen. In special cases, when the pressure of the nitrogen recovery tank is lower than a set value (such as 100kPag), fresh nitrogen is used for supplementing; when the pressure of the nitrogen recovery tank exceeds a set value (such as 800kPag), the nitrogen recovery tank is discharged to a tail gas recovery system.
The utility model provides a cyclic utilization device of tank field tail gas or technology tail gas which characterized in that: comprises a storage tank or a pressurized nitrogen discharging container, a buffer tank, a compressor, a cooler and a nitrogen recovery tank, wherein all the devices are connected by pipelines. The buffer tank is provided with a tail gas inlet and a tail gas outlet, the tail gas inlet collects the tail gas or the process tail gas in the tank area, and the tail gas outlet is connected with the tail gas inlet of the compressor; the tail gas outlet of the compressor is connected with the tail gas inlet of the cooler; the cooler is provided with a tail gas inlet, a tail gas outlet, a condensate discharge port, a cooling medium inlet and a cooling medium outlet, the tail gas inlet is connected with the tail gas outlet of the compressor, and the tail gas outlet is connected with the tail gas inlet of the nitrogen recovery tank; the nitrogen recovery tank is provided with a tail gas inlet, a fresh compressed nitrogen inlet, a circulating nitrogen outlet and a tail gas discharge port, the tail gas inlet of the nitrogen recovery tank is connected with the tail gas outlet of the cooler, the circulating nitrogen outlet is connected with a tank storage tank or a pressurized nitrogen discharge container compressed nitrogen inlet, the fresh compressed nitrogen inlet is used for supplementing fresh compressed nitrogen, and the tail gas discharge port is used for discharging redundant recovered nitrogen.
The buffer tank is provided with a pressure gauge for detecting and controlling the pressure of the buffer tank; and the nitrogen recovery tank is provided with a pressure gauge for detecting and controlling the pressure of the nitrogen recovery tank.
Preferably, when the buffer tank is used for recycling the tail gas in the tank field, the pressure of the buffer tank is controlled to be 0.1-10 kPag, and a safe discharge port is arranged on the buffer tank; when the buffer tank is used for recycling the process tail gas of the pressurized nitrogen discharging container, the pressure is controlled to be 0.1 kPag-3.0 MPag.
Preferably, the pressure of the buffer tank is controlled using a variable frequency compressor.
Preferably, the outlet pressure of the compressor is controlled to be 0.1-3.0 MPag.
Preferably, the chiller cooling medium is chilled water, and in the absence of chilled water, it may be replaced by circulating cooling water or other cooling medium.
Preferably, the pressure of the nitrogen recovery tank is controlled to be 0.1-3.0 MPag.
The utility model discloses can be used to all basin with nitrogen protection and the technology tail gas cyclic utilization that the pressurization nitrogen gas container of unloading produced, if there is not special circumstances, possible not exhaust tail gas.
Drawings
Fig. 1 is a schematic view of the present invention.
The labels in FIG. 1 are: 1. a storage tank or pressurized nitrogen discharge vessel; 2. a buffer tank; 3. a buffer tank pressure gauge; 4. a compressor; 5. a cooler; 6. a nitrogen recovery tank; 7. nitrogen recovery tank pressure gauge
Detailed Description
The following description of the embodiment of the present invention, referring to fig. 1, will further explain the embodiments of the present invention, such as the mutual positions and connection relationships between the components, the functions and operation principles of the components, etc.
The utility model provides a cyclic utilization device of tank field tail gas or technology tail gas which characterized in that: comprises a storage tank or a pressurized nitrogen discharging container 1, a buffer tank 2, a compressor 4, a cooler 5 and a nitrogen recovery tank 6, wherein the devices are connected by pipelines. The buffer tank 2 is provided with a tail gas inlet and a tail gas outlet, the tail gas inlet collects the tail gas or the process tail gas in the tank area, and the tail gas outlet is connected with the tail gas inlet of the compressor 4; the tail gas outlet of the compressor 4 is connected with the tail gas inlet of the cooler 5; the cooler 5 is provided with a tail gas inlet, a tail gas outlet, a condensate discharge port, a cooling medium inlet and a cooling medium outlet, the tail gas inlet is connected with the tail gas outlet of the compressor 4, and the tail gas outlet is connected with the tail gas inlet of the nitrogen recovery tank 6; the nitrogen recovery tank 6 is provided with a tail gas inlet, a fresh compressed nitrogen inlet, a circulating nitrogen outlet and a tail gas discharge port, the tail gas inlet of the nitrogen recovery tank 6 is connected with the tail gas outlet of the cooler 5, the circulating nitrogen outlet is connected with the compressed nitrogen inlet of the tank storage tank or the pressurized nitrogen discharge container 1, the fresh compressed nitrogen inlet is used for supplementing fresh compressed nitrogen, and the tail gas discharge port is used for discharging redundant recovered nitrogen.
The buffer tank 2 is provided with a buffer tank pressure gauge 3 for detecting and controlling the pressure of the buffer tank; and a nitrogen recovery tank pressure gauge 7 is arranged on the nitrogen recovery tank 6 and used for detecting and controlling the pressure of the nitrogen recovery tank 6.
Nitrogen is normally circulated between the storage tank or pressurized nitrogen discharge vessel 1 and the nitrogen recovery tank 6 at all times. The pressure of the nitrogen recovery tank 6 is kept within a certain range (such as 0.1-3.0 MPag), nitrogen does not need to be supplemented, and tail gas is not discharged outwards. In special cases, when the pressure of the nitrogen recovery tank 6 exceeds a set value (such as 3.0MPag), the nitrogen recovery tank is discharged to a tail gas treatment system; when the nitrogen recovery tank 6 pressure is below the set point (e.g., 0.1MPag), make-up is performed with compressed nitrogen.
Preferably, when the buffer tank 2 is used for recycling the tail gas in the tank field, a safe discharge port is arranged on the buffer tank 2, and the pressure of the safe discharge port is controlled to be 0.1-10 kPag; when the buffer tank 2 is used for recycling the tail gas of the pressurized nitrogen discharging container, the pressure is controlled to be 0.1 kPag-3.0 MPag.
Preferably, the pressure of the buffer tank 2 is controlled using a variable frequency compressor 4.
Preferably, the outlet pressure of the compressor 4 is controlled within 0.1-3.0 MPag.
Preferably, the cooling medium of the cooler 5 is chilled water, and when the chilled water is not available, circulating cooling water or other cooling media can be used instead.
Preferably, the pressure of the nitrogen recovery tank 6 is controlled to be 0.1-3.0 MPag.
The invention has been described above with reference to fig. 1, it is obvious that the invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made by the method concept and technical solution of the invention, or the concept and technical solution of the invention can be directly used in other occasions without improvement, all within the scope of the invention.
Claims (3)
1. The utility model provides a cyclic utilization device of tank field tail gas or technology tail gas which characterized in that: comprises a storage tank or a pressurized nitrogen discharging container, a buffer tank, a compressor, a condenser and a nitrogen recovery tank; the buffer tank is connected with a storage tank or a pressurized nitrogen discharging container and is connected with a compressor; the compressor is connected with the condenser; the condenser is provided with a tail gas inlet, a tail gas outlet, a condensate discharge port, a cooling medium inlet and a cooling medium outlet, the tail gas inlet is connected with the compressor, and the tail gas outlet is connected with the inlet of the nitrogen recovery tank; the nitrogen recovery tank is provided with an inlet, a fresh compressed nitrogen inlet, a circulating nitrogen outlet and a discharge port, and the circulating nitrogen outlet is connected with a storage tank or a pressurized nitrogen discharge container.
2. The recycling device of tank farm tail gas or process tail gas according to claim 1, characterized in that: the buffer tank is provided with a buffer tank pressure gauge.
3. The recycling device of tank farm tail gas or process tail gas according to claim 1, characterized in that: the nitrogen recovery tank is provided with a nitrogen recovery tank pressure gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021641966.0U CN212510484U (en) | 2020-08-10 | 2020-08-10 | Recycling device for tank field tail gas or process tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021641966.0U CN212510484U (en) | 2020-08-10 | 2020-08-10 | Recycling device for tank field tail gas or process tail gas |
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| Publication Number | Publication Date |
|---|---|
| CN212510484U true CN212510484U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021641966.0U Active CN212510484U (en) | 2020-08-10 | 2020-08-10 | Recycling device for tank field tail gas or process tail gas |
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| CN (1) | CN212510484U (en) |
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2020
- 2020-08-10 CN CN202021641966.0U patent/CN212510484U/en active Active
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