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A method for inter-bed cooling in wet gas sulfuric acid plants

A kind of equipment and technology of sulfuric acid, applied in the direction of steam generation method, separation method, chemical instrument and method using heat carrier, etc., can solve the problem of unspecified type of interbed cooler

Inactive Publication Date: 2019-01-15
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such boilers are not intended for interbed cooling in the converter, but for subsequent cooling after the converter, and the type of interbed cooler used is not specified

Method used

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  • A method for inter-bed cooling in wet gas sulfuric acid plants
  • A method for inter-bed cooling in wet gas sulfuric acid plants
  • A method for inter-bed cooling in wet gas sulfuric acid plants

Examples

Experimental program
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Effect test

Embodiment 1

[0051] In this example, will contain 0.38vol% CS 2 , 0.36vol%H 2 S and the rest is 30,000Nm of ambient air 3 / h viscose tail gas respectively in figure 1 and 2 shown in the WSA device processing. Additionally, 400kg / h molten sulfur (7) is incinerated to facilitate sulfuric acid production and add supplementary heat to the thermal burner, and 80kg / h low pressure steam (54) is used for atomization of molten sulfur. Natural gas (8) is added to the hot burner to achieve a temperature of 850°C in the hot burner (6). In the catalytic oxidation of CS 2 and H 2 After S, the resulting process gas contains 2-3 vol% SO 2 .

[0052] In this example, the sulfuric acid dew point temperature in the process gas stream (18) at the inlet of the WSA condenser (19) is only 238°C. Consequently, the inlet temperature of the WSA condenser as well as the saturated steam temperature in the steam system have been reduced to 270°C and 255°C, respectively, compared to the maximum values ​​of 290°C...

Embodiment 2

[0064] image 3 Another embodiment of the application of the invention is shown. In this example, the WSA device is configured to make 2 SO 4 , 4wt%H 2 O, 0.3wt%SO 2 Regenerated with 100MTPD waste sulfuric acid (101) of 5.7wt% sulfur-containing hydrocarbons. The spent acid (101 ) is atomized into the thermal burner (6) using atomizing air (102) and the heat input required to maintain the burner temperature of ~1000°C is supplied by burning gas. Hot combustion air is supplied via line (141). In the thermal burner (6), the spent acid is degraded to SO 2 、H 2 O and CO 2 . The process gas (116) from the burner is sent to the waste heat boiler (110) where it is cooled. In a further cooling step, the process gas is cooled in an air preheater (111). The process gas then enters an electrostatic precipitator (112) where dust, mainly from corrosion products of the upstream alkylation process, is removed.

[0065] Optionally, if needed to reduce NOx emissions, an SCR reactor ...

Embodiment 3

[0073] Figure 4 Another embodiment of the application of the invention is shown. In this embodiment, the WSA plant is configured to treat sour gas. will contain 30vol% H 2 S, 0.4vol%CO, 0.1vol%H 2 , 700ppmv COS and the rest is CO 2The acid gas is sent to the hot burner (6) via pipeline (105). In the hot burner, the acid gas is oxidized to SO 2 , CO 2 and H 2 O. Combustion and SO 2 Oxygen required for oxidation is sent to the burner in the form of hot air via line (141). Process gas from the burner enters the waste heat boiler (110) via line (116). In the waste heat boiler, the process gas is cooled to SO 2 Converter inlet temperature. depends on NO x emission requirements, the process gas can then be subjected to NO in the SCR reactor (113) x reduction, and the ammonia required for the SCR reaction is added to the process gas via line (165). Then, include SO 2 The process gas (122) enters SO 2 Converter (12), similar to that in Example 2, the SO 2 The conver...

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Abstract

A method for cooling of process gas between catalytic layers or beds in a sulfuric acid plant is disclosed. In the method, one or more boilers, especially water tube boilers, are used instead of conventional steam superheaters to cool the process gas between the catalytic beds in a SO2 converter of the plant; and in this sulfuric acid device, sulfuric acid is produced from feed gases containing sulfurous components like SO2, H2S, CS2 and COS or liquid feeds like molten sulfur or spent sulfuric acid, and therefore a less complicated and more cost efficient heat exchanger layout is obtained.

Description

technical field [0001] The present invention relates to a method for interbed cooling of a process gas between catalytic layers or catalytic beds in a wet gas sulfuric acid (WSA) plant in which sulfur containing components such as SO 2 、H 2 S, CS 2 and COS) or liquid feeds such as molten sulfur or spent sulfuric acid from alkylation technology or so-called BTX production to produce sulfuric acid. Background technique [0002] Sulfuric acid (H 2 SO 4 ) is an important commercial chemical whose production exceeds 200 million tons / year. It is mainly used in fertilizer production, but it is also used especially in the production of viscose fibers, pigments, in batteries, in the metallurgical industry and in the refining industry. [0003] In sulfuric acid plants, sulfur-containing feed components are typically converted to SO in thermal burners 2 . Then, using the oxidized SO 2 The active catalyst converts SO according to the following reaction 2 The gas is further oxid...

Claims

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Application Information

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IPC IPC(8): C01B17/77
CPCC01B17/77B01D53/8612C01B17/765C01B17/803C01B17/806B01D53/8603B01D2257/306B01D2257/308B01J8/0496B01J8/0453B01J2208/00168Y02P20/10C01B17/775B01D2257/304B01J8/0492B01J2208/00194F22B1/18
Inventor M·利克M·莫勒霍杰
Owner HALDOR TOPSOE AS
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