Unlock instant, AI-driven research and patent intelligence for your innovation.

A system and method for collecting, purifying and recovering tank top gas in a storage tank area

A technology for storage tank area and top gas, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high discharge outlet concentration, low absorption efficiency of light hydrocarbons, and the purification efficiency cannot stably meet the requirements of emission standards. , to enhance the desorption effect, save the cost of waste gas treatment, and increase the overall stability and reliability.

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
View PDF22 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low absorption efficiency of the absorption method for light hydrocarbons, after a period of operation, the concentration of light hydrocarbons at the discharge port will become higher and higher due to the "dead cycle", resulting in the concentration of non-methane total hydrocarbons in the purified gas soon exceeding 100mg / m 3 , even exceeding the 25g / m3 stipulated in the "Emission Standard of Air Pollutants for Oil Storage Depots" 3 The limit value and purification efficiency cannot stably meet the requirements of the existing emission standards

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A system and method for collecting, purifying and recovering tank top gas in a storage tank area
  • A system and method for collecting, purifying and recovering tank top gas in a storage tank area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Attached figure 1 The treatment system is used to treat the breathing gas produced by the benzene storage tank farm, and the concentration of benzene in the exhaust gas on the top of the tank is 2.2×10 4 mg / m 3 .

[0037] The tank area is equipped with a nitrogen supplement pipeline. When the pressure on the top of the tank is lower than 50PaG, nitrogen supplement is started; when the pressure reaches 150PaG, nitrogen supplement is stopped. When the tank top pressure reaches 1200PaG, the remote switch valve is opened, and the exhaust gas in the tank enters the summarizing pipeline; when the exhaust gas pressure in the summarizing pipeline reaches 1100PaG, the liquid ring compressor is started to transport the exhaust gas to the adsorption separation device. Fill 10% alumina, 20% silica gel, 50% macroporous activated carbon, and 20% molecular sieve from the inlet to the outlet of the adsorption tank. The pore diameter of alumina is 50nm, the pore diameter of silica ge...

Embodiment 2

[0041] Attached figure 2 Said treatment system, the treatment pollution source is the waste gas from the top of the tank area of ​​the waste oil tank, and the concentration of hydrogen sulfide in the waste gas is 1000mg / m 3 , the organic sulfide is 150mg / m 3 , non-methane total hydrocarbon concentration 4.2×10 5 mg / m 3 .

[0042] The difference from Example 1 is that the exhaust gas first enters the pretreatment device 7 for desulfurization, and the desulfurization is treated by low-temperature diesel absorption + desulfurizer. Straight-run gas oil is used for diesel absorption, the initial boiling point is 190°C, the absorption temperature is 10°C, the volume ratio of absorbent to diesel is 1:0.05; the desulfurizer is 30wt% N-methyldiethanolamine (MDEA). The volume ratio is 0.1.

[0043] After desulfurization treatment, the exhaust gas enters the adsorption separation equipment, and is filled with 5% alumina, 20% modified silica gel, 60% microporous activated carbon, an...

Embodiment 3

[0047] The treatment process and operating conditions are the same as in Example 2, except that the height of the adsorption zone is 60% of the filling height, and the switching time of the adsorption tower is 10 minutes. After 10 adsorption regeneration cycles, the concentration of benzene in the purified gas at the outlet of the adsorption tower is less than 4mg / m 3 , toluene concentration 3 , xylene concentration 3 , non-methane total hydrocarbon concentration 3 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a system and method for collecting, purifying and recovering tank top gas in a storage tank area, including (1) collecting tank top gas in a unified manner through a nitrogen-sealing self-control component, a summary pipeline pressure sensor and a remote switch valve; (2) collecting waste gas Enter the adsorption separation device through the air-entraining equipment, and the adsorption separation device is an adsorption tank arranged side by side. According to the flow direction of the gas in the adsorption tank, the adsorbents filled in the adsorption tank are alumina, silica gel and / or modified silica gel, Activated carbon, molecular sieve; when the height of the adsorption zone of one adsorption tank reaches 10% to 70% of the filling height, switch to the next adsorption tank for adsorption, and at the same time perform desorption treatment on the adsorption tank. The invention can efficiently collect and purify the waste gas discharged from the storage tank, has the advantages of short treatment process, high recovery efficiency, and good long-term operation stability, and is suitable for storage tanks such as oil storage tank farms, oily sewage tank farms, and oil intermediate tank farms. Exhaust gas is discharged from the top of the tank.

Description

technical field [0001] The invention belongs to the field of waste gas treatment, and in particular relates to a system and method for collecting, purifying and recovering tank top gas in a storage tank area. It is suitable for the treatment of exhaust gas from tank roofs in petroleum refining, petrochemical, oil sales and other refined oil tank farms, oily sewage tank farms, intermediate tank farms for oil products, and chemical oil product tank farms. Background technique [0002] In oil refining and chemical enterprises, various storage tanks will emit waste gas containing organic components during normal use, such as acid water tanks, waste oil tanks, product intermediate tanks, crude oil tanks, refined oil tanks, chemical product tanks, etc. Long-term activities of staff in an environment polluted by these substances may cause diseases such as the respiratory system, digestive system, and reproductive system, and may also cause body lesions or even cancer; when the shor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01D53/14
CPCB01D53/04B01D53/1456B01D53/1493B01D2252/10B01D2252/20B01D2252/204B01D2253/102B01D2253/104B01D2253/106B01D2253/116B01D2259/40086
Inventor 郭兵兵刘忠生祝月全刘洋王海波朴勇戴金玲李经纬
Owner CHINA PETROLEUM & CHEM CORP