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Method for treating sulfur-containing and hydrocarbon-containing waste gas

A treatment method and exhaust gas technology, applied in the field of environmental governance, can solve problems such as high device failure rate, high hydrocarbon concentration, and low safety, and achieve the effects of low device failure rate, low oxidation temperature, and good safety

Active Publication Date: 2014-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the method adopts catalytic combustion, the uncondensed organic sulfide may poison and deactivate the catalytic combustion catalyst. When hydrogen sulfide exists in the gas, the poisoning phenomenon will be more serious; when the method adopts regenerative combustion, the gas can be burned The concentration of hydrocarbons in the water drops to 120mg / m 3 Above, the organic sulfide and hydrogen sulfide in the gas are oxidized to SO with low toxicity and low pollution 2 , but the regenerative combustion temperature is generally above 800°C, and at least two reversing switching valves are required to switch frequently to change the gas flow direction. The failure rate of the valve group is high, the energy consumption is high, and the safety is poor.
[0006] To sum up, the existing treatment methods for hydrocarbon-containing and sulfur-containing gas in refineries either have no dehydrocarbon capability, or have dehydrocarbon capability but the concentration of hydrocarbons in the purified gas is still high, or although they can dehydrocarbon and desulfurization, the device failure rate is high , high energy consumption, slightly lower security

Method used

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  • Method for treating sulfur-containing and hydrocarbon-containing waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A gas oil storage tank area and a waste oil tank area discharge exhaust gas, the temperature is about 40°C, and the total hydrocarbon concentration is 9×10 4 ~40×10 4 mg / m 3 , the sulfide concentration is 1000mg / m 3 about.

[0024] The fresh diesel is normal second-line diesel with an initial boiling point of 200°C. It comes from the fractionation tower of the refinery unit at a temperature of 60°C. After heat exchange and cooling to 12°C, it enters the absorption tower. Packing is installed in the absorption tower, and the number of theoretical plates is 4. , the volume ratio of liquid to gas in the absorption tower (standard state) is 50:1000, and the total hydrocarbon concentration of the exhaust gas from the top of the absorption tower is 12000mg / m 3 Around, the sulfide concentration is 60mg / m 3 about.

[0025] The exhaust gas from the absorption tower is diluted with air to a total hydrocarbon concentration of 4400mg / m3 3 After heat exchange and heating to 22...

Embodiment 2

[0028] Hydrogen sulfide 2000mg / m3 in waste gas from sour water tank area of ​​an oil refinery 3 About, organic sulfide 150mg / m 3 Around, total hydrocarbon concentration 40×10 4 mg / m 3 about.

[0029] Fresh diesel oil is normal second-line diesel oil with an initial boiling point of 200°C. It comes from the fractionation tower of the refinery unit at a temperature of 60°C. After heat exchange and cooling to 10°C, it enters the absorption tower. Packing is installed in the absorption tower, and the number of theoretical plates is 5. , the volume ratio of liquid to gas in the absorption tower (standard state) is 80:1000, and the total hydrocarbon concentration of the exhaust gas from the top of the absorption tower is 10000mg / m 3 Around, the sulfide concentration is 90mg / m 3 about.

[0030] The exhaust gas from the absorption tower is diluted with air to a total hydrocarbon concentration of 3500mg / m3 3 Then, after heat exchange and heating to 230°C, it enters the catalytic ...

Embodiment 3

[0032] Hydrogen sulfide 1000mg / m3 contained in waste gas from a waste oil tank area of ​​an oil refinery 3 About, dimethyl disulfide 300mg / m 3 About, methyl mercaptan 60mg / m 3 Around, total hydrocarbon concentration 20×10 4 mg / m 3 about.

[0033] The fresh diesel oil is normal second-line diesel oil with an initial boiling point of 200°C. It comes from the fractionation tower of the refinery unit at a temperature of 60°C. After heat exchange and cooling to 5°C, it enters the absorption tower. Packing is installed in the absorption tower, and the number of theoretical plates is 4. , the volume ratio of liquid to gas in the absorption tower (standard state) is 20:1000, and the total hydrocarbon concentration of the exhaust gas from the top of the absorption tower is 9000mg / m 3 Around, the sulfide concentration is 90mg / m 3 about.

[0034] The exhaust gas from the absorption tower is diluted with air to a total hydrocarbon concentration of 3500mg / m3 3 Then, after heat excha...

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Abstract

The invention discloses a method for treating sulfur-containing and hydrocarbon-containing waste gas, in particular to a method for treating the exhausted gas which is generated from a sour water tank, a slop oil tank and an oxidized sweetening device of an oil refinery. The sulfur-containing and hydrocarbon-containing waste gas firstly enters into an absorption tower to be subjected to absorption and dehydrocarbon by low-temperature diesel oil, and then enters into a catalytic oxidation reactor, and then respectively passes through a catalytic oxidation desulfurization layer and a catalytic oxidation dehydrocarbon bed layer to be purified and finally exhausted. The method guarantees the hydrocarbon components of the waster gas to be effectively recycled and also guarantees the exhaust gas to be discharged up to the standard, thereby having good comprehensive treating effect.

Description

technical field [0001] The invention provides a method for treating waste gas containing hydrocarbon and sulfur, in particular a method for treating waste gas discharged from acid water tanks, waste oil tanks and oxidative sweetening devices of refineries, belonging to the field of environmental treatment. Background technique [0002] In refineries, acid water tanks, waste oil tanks, oxidation sweetening devices, etc. all discharge hydrocarbon-containing and sulfur-containing waste gas, and the concentration of hydrocarbons in the gas can reach 300,000-600,000 mg / m 3 , the total concentration of hydrogen sulfide and organic sulfide can reach hundreds of mg / m 3 , although the concentration of hydrogen sulfide in the tail gas of the oxidative sweetening unit is not high, the concentration of organic sulfide can reach hundreds of mg / m 3 , This kind of gas is emitted into the atmosphere, on the one hand, it wastes oil and gas energy, on the other hand, it also pollutes the env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/14B01D53/52B01D53/72
Inventor 刘忠生方向晨王海波李凌波
Owner CHINA PETROLEUM & CHEM CORP
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