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United acid manufacturing method by utilizing sulfuretted hydrogen and sulphur

A hydrogen sulfide and sulfur technology, applied in sulfur compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as unplanned shutdown of devices, dew point corrosion of economizers, corrosion leakage of heat pipe economizers, etc., to avoid dew point corrosion , the effect of improving the efficiency of use

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the wet conversion process, the main problem is that the outlet of the third stage of the converter and the economizer after the medium temperature superheater are prone to dew point corrosion
Therefore, the heat pipe economizer frequently has corrosion leakage, which often causes unplanned shutdown of the device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the 150kt / a hydrogen sulfide and sulfur combined acid production plant, the input amount of 25% hydrogen sulfide gas is 1500Nm 3 / h, the input amount of sulfur is 5.2t / h, which is wet acid production process at this time. The steam pressure of the two fire tube boilers at the outlet of the third section of the converter and after the medium temperature superheater is controlled at 5.6MPa. Under this production load and working condition, the two fire tube boilers are running well, and the exhaust gas inspection is carried out from the condensate acid discharge pipe of the equipment, and no condensate acid is discharged. The device has been in continuous production for 15 days, and the two boilers are in stable operation, with no discharge of condensed acid, no corrosion leaks, and no unplanned shutdown.

Embodiment 2

[0018] In the 150kt / a hydrogen sulfide and sulfur combined acid production plant, the input amount of 25% hydrogen sulfide gas is 1500Nm 3 / h, the input amount of sulfur is 5.2t / h, which is wet acid production process at this time. The steam pressure of the two fire tube boilers at the outlet of the third section of the converter and after the medium temperature superheater is controlled from 5.6 MPa to 5.1 MPa. Under this production load and working condition, the two fire tube boilers are running well, and the exhaust gas inspection is carried out from the condensate acid discharge pipe of the equipment, and no condensate acid is discharged. The device has been in continuous production for 15 days, and the two boilers are in stable operation, with no discharge of condensed acid, no corrosion leaks, and no unplanned shutdown.

Embodiment 3

[0020] In the 150kt / a hydrogen sulfide and sulfur combined acid production plant, the input amount of 25% hydrogen sulfide gas is raised to 2000Nm 3 / h, the input amount of sulfur is 5.2t / h, which is wet acid production process at this time. The steam pressure of the two fire tube boilers at the outlet of the third section of the converter and after the medium temperature superheater is controlled at 5.1MPa. Under this production load and working condition, the two fire tube boilers are running well, and the exhaust gas inspection is carried out from the condensate acid discharge pipe of the equipment, and no condensate acid is discharged. The device has been in continuous production for 15 days, and the two boilers are in stable operation, with no discharge of condensed acid, no corrosion leaks, and no unplanned shutdown.

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PUM

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Abstract

The invention relates to a united acid manufacturing method by utilizing sulfuretted hydrogen and sulphur. The method is characterized in that in a united acid manufacturing production process by utilizing the sulfuretted hydrogen and the sulphur, a fire-tube boiler is adopted at a third section of outlet of a converter and behind an intermediate temperate superheater; the evaporating pressure of the boiler is controlled to be 5.1-5.6Mpa, and the saturation temperature is 265-271 DEG C, the inner wall temperature of a fire tube is improved, and the temperature of the fire tube wall is 265.5-271.4 DEG C, so that the condition that the temperature of the fire tube wall is higher than the dew point temperature of sulfuric acid in the gas is guaranteed, and the dew point temperature in a whole sulfuretted hydrogen working condition is 263 DEG C, so that the dew point corrosion is avoided; meanwhile, two acid manufacturing working conditions of a wet method and a dry method are considered, two fire tube boilers are adopted to be connected in series for operation; when the acid is manufactured by the wet method, the pressure of the two boilers is controlled to be 5.1-5.6Mpa; when the acid is manufactured by a dry method, the dew point of the sulfuric acid in the gas is about 155 DEG C according to the test of the dew point of the sulfuric acid in gas; the two boilers are separated to operate; the pressure of the first boiler is controlled to be 4.0-4.8Mpa; the pressure of the second boiler is controlled to be 1.0-1.8Mpa; and low-pressure steam is directly produced, and the heat is further recovered. With the adoption of the method provided by the invention, the dew point corrosion is avoided, and the use efficiency of process equipment is greatly improved.

Description

technical field [0001] The invention relates to a method for jointly producing acid by hydrogen sulfide and sulfur. Background technique [0002] Sulfuric acid is one of the important basic chemical raw materials and the most important product in the chemical industry. It is mainly used to manufacture inorganic chemical fertilizers, and secondly as a basic chemical raw material for smelting of non-ferrous metals, petroleum refining, petrochemicals, textile printing and dyeing, etc. It has a wide range of uses. [0003] At present, sulfuric acid production has different production processes due to different sources of raw materials, mainly sulfuric acid production process, pyrite acid production process, smelting flue gas acid production process, hydrogen sulfide acid production process and gypsum acid production process. The above methods all need to use vanadium catalyst to make SO 2 direct oxidation to SO 3 , collectively referred to as the "contact method" acid produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
Inventor 张向东李育新李烨鹏盛荣华刘莉胡继承陈又兴
Owner CHINA PETROLEUM & CHEM CORP
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