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Revamping of a claus plant with a sulfuric acid plan

A Claus reaction, Claus tail gas technology, applied in combustion equipment, sulfur preparation/purification, lighting and heating equipment, etc., can solve the problem of not realizing the beneficial effects of Claus process and sulfuric acid process, etc.

Pending Publication Date: 2021-12-10
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, recycling of sulfuric acid is only considered as a reduction to sulfuric acid and has not been evaluated for H 2 SO 4 Consequences of recycling for wet sulfuric acid process or Claus process, i.e., not recognizing H 2 SO 4 Recirculation needs to reduce the O directed to the Claus reactor 2 amount, and did not achieve a favorable effect on the Claus process and the sulfuric acid process

Method used

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  • Revamping of a claus plant with a sulfuric acid plan
  • Revamping of a claus plant with a sulfuric acid plan
  • Revamping of a claus plant with a sulfuric acid plan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0249] Example 1: Calculation of combustion air.

Embodiment 11

[0250] Example 1.1: Calculation of combustion air demand for gas

[0251] The flow of combustion air into the Claus reactor is usually controlled by measuring the other feed gas flows, and using their composition, the air demand per unit feed gas flow is calculated by comparing the air demand of each feed stream to Add to calculate the total air requirement:

[0252] G 空气 =∑K i ·G i

[0253] K i is the air demand coefficient, unit air flow per feed stream i; G i is the flow rate of feed stream i. The unit can be freely selected according to the nature of the feed stream, however, care should be taken to ensure that each air requirement (K i ··G i ) units are equal. For airflow, the typical flow unit is Nm 3 / h, kg / h and kmol / h, for liquid streams most commonly m 3 / h and kg / h.

[0254] Air demand factor K i Calculated from the composition of the feed stream. For containing 100vol% CH 4 For the feed stream, the air demand can be calculated from the following chem...

Embodiment 12

[0260] Example 1.2: H 2 Calculation of S gas demand for combustion air

[0261] Conversion of H in the feed gas 2 S of O 2 The requirement is achieved by taking into account that the full H 2 S oxidizes, but expects H 2 S and SO 2 The ratios are calculated in the range of 2-4.

[0262] h 2 S and SO 2 The ratio R is defined as:

[0263]

[0264] In the equation, n is the number of moles and α is H 2 S to SO 2 proportion. On the right side of the equation, n H2S is the H in the feed gas 2 moles of S.

[0265] h 2 The chemical reaction for S oxidation is

[0266] h 2 S+3 / 2O 2 → SO 2 +H 2 o

[0267] Using stoichiometry and rearranging the equations for R, O 2 demand becomes

[0268]

[0269] where n H2S is the H in the feed gas 2 Moles of S, nO 2 is to obtain a given H in the converted gas 2 S and SO 2 O required for the ratio R 2 number of moles. Considering the H in the feed gas 2 S concentration, yH in combustion air 2 S (mole fraction) and ...

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Abstract

The present invention relates to a revamp process for modifying a sulfur abatement plant comprising a Claus process plant producing elemental sulfur, said Claus process plant comprising a Claus reaction furnace and 1 or more Claus conversion stages, each Claus conversion stage comprising a conversion reactor and a means for elemental sulfur condensation, and a means of Claus tail gas oxidation configured for receiving a Claus tail gas from said Claus process plant and configured for providing an oxidized Claus tail gas, said process revamp comprising the steps of a. providing a sulfuric acid producing tail gas treatment plant producing sulfuric acid, and b. providing a means for transferring an amount or all of the sulfuric acid produced in said sulfuric acid producing tail gas treatment plant to said Claus reaction furnace characterized in the moles of sulfur in the transferred sulfuric acid relative to the moles of elemental sulfur withdrawn from the Claus process plant is from 3% or 5% to 15%, 20% or 25% with the associated benefit of enabling a higher sulfur abatement capacity and / or a higher extent of sulfur removal, while producing elemental sulfur, which is a product of value which may be handled with few safety restrictions, compared to e.g. sulfuric acid, while avoiding excessive use of support fuel due to compensate for energy consumed by evaporation of sulfuric acid in the Claus reaction furnace.

Description

technical field [0001] The present invention relates to a retrofitting method for improving sulfur removal, operating cost and H 2 One or more of the ability of S to convert to elemental sulfur and sulfuric acid. Background technique [0002] h 2 S is a common by-product of many processes including hydrodesulfurization of refinery streams, natural gas processing and viscose fiber production. Ideally, the H 2 converts S before it is emitted into the atmosphere, because H 2 S is highly toxic, odorous and environmentally challenging. [0003] In the refining process, in addition to producing the notoriously high concentrations of H 2 In addition to S gas, a so-called acidic water stripping gas, which contains approximately equal amounts of H 2 S, H 2 O and NH 3 . [0004] Especially in refineries, for the reduction of H 2 The process of choice for the S has always been the Claus process, which has been known and optimized over the past eight decades. Claus Craft by H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/04C01B17/76B01D53/52F23C6/00
CPCC01B17/0404C01B17/0253C01B17/76C01B17/80F23C6/042B01D53/523B01D53/8615B01D2255/20723Y02P20/129C01B17/0447C01B17/0452B01J19/0013B01J19/2405B01J19/2465B01J2219/00157C01B17/0456C01B17/775C01B17/806C01P2006/80B01D53/1481B01D53/1493F23G7/06F23G2209/14
Inventor M·特莱夫森M·利克M·莫勒霍杰
Owner HALDOR TOPSOE AS