System and method for co-production of calcium oxide and sulphur through coal gasification synergistic with gypsum calcination

A calcium oxide and coal gasification technology, which is applied in the preparation/purification of sulfur, calcium/strontium/barium sulfate, granular/powdered fuel gasification, etc., can solve the problem that the desulfurization process is difficult to meet the emission standards and increase the desulfurization load of the process system , waste of sulfur resources and other issues, to achieve the effect of simple equipment material selection and process control, reducing the probability of occurrence, and ensuring sealing

Active Publication Date: 2019-05-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for high concentration SO 2 flue gas, the inventors found that if the traditional flue gas desulfurization method is used to desulfurize SO in the flue gas 2 , will undoubtedly increase the desulfurization load of the process system, making it difficult for the current desulfurization process to meet the increasingly stringent emission standards
At the same time, the traditional flue gas desulfurization process is used to treat high-concentration SO 2 Flue gas is also a waste of sulfur resources in flue gas

Method used

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  • System and method for co-production of calcium oxide and sulphur through coal gasification synergistic with gypsum calcination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A system for coal gasification and gypsum calcination and co-production of calcium oxide and sulfur includes: U-shaped furnace 4, high-temperature separator I5, and gypsum two-stage calcining furnace 6. The U-shaped furnace 4 is divided into a left calcination section and a right side. In the coal gasification section, the left calcination section is connected to the gypsum preheater I3 and the gypsum storage bin I2 in sequence, and the right coal gasification section is respectively connected to the coal powder storage bin 1 and the second gypsum calciner 6; The left calcining section of the furnace 4 is connected to the high temperature separator I5, and the discharge port at the bottom of the high temperature separator I5 is connected to the gypsum second-stage calcining furnace 6 and the reduction tower 9 respectively, and the gas outlet at the top of the high temperature separator I5 It is connected to the gypsum preheater I3, and the feed port of the second-stage gy...

Embodiment 2

[0074] A system for coal gasification and gypsum calcination and co-production of calcium oxide and sulfur includes: U-shaped furnace 4, high-temperature separator I5, and gypsum two-stage calcining furnace 6. The U-shaped furnace 4 is divided into a left calcination section and a right side. In the coal gasification section, the left calcination section is connected to the gypsum preheater I3 and the gypsum storage bin I2 in sequence, and the right coal gasification section is respectively connected to the coal powder storage bin 1 and the second gypsum calciner 6; The left calcining section of the furnace 4 is connected to the high temperature separator I5, and the discharge port at the bottom of the high temperature separator I5 is connected to the gypsum second-stage calcining furnace 6 and the reduction tower 9 respectively, and the gas outlet at the top of the high temperature separator I5 It is connected to the gypsum preheater I3, and the feed port of the second-stage gy...

Embodiment 3

[0078] A system for coal gasification and gypsum calcination and co-production of calcium oxide and sulfur includes: U-shaped furnace 4, high-temperature separator I5, and gypsum two-stage calcining furnace 6. The U-shaped furnace 4 is divided into a left calcination section and a right side. In the coal gasification section, the left calcination section is connected to the gypsum preheater I3 and the gypsum storage bin I2 in sequence, and the right coal gasification section is respectively connected to the coal powder storage bin 1 and the second gypsum calciner 6; The left calcining section of the furnace 4 is connected to the high temperature separator I5, and the discharge port at the bottom of the high temperature separator I5 is connected to the gypsum second-stage calcining furnace 6 and the reduction tower 9 respectively, and the gas outlet at the top of the high temperature separator I5 It is connected to the gypsum preheater I3, and the feed port of the second-stage gy...

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Abstract

The invention relates to a technology and method for co-production of calcium oxide and sulphur through coal gasification synergistic with gypsum calcination. Calcium sulfate and a reducing substancereact at the high temperature to generate calcium sulfide, the calcium sulfide can continue reacting with the calcium sulfate to generate calcium oxide and high-concentration SO2 flue gas, meanwhile,the calcium oxide can also react with the high-concentration SO2 flue gas at the low temperature to generate elemental sulfur steam, a U-shaped coal gasification calcining furnace, a gypsum second-stage calcining furnace, a reduction tower, a sulphur recovering device, various heat exchangers and the like are utilized, all reaction conditions are precisely controlled, thus the sulphur is preparedthrough low-grade gypsum difficult to treat, meanwhile, the calcium oxide is by-produced, and a by-product, namely the calcium oxide, can replace limestone to serve as a desulfurization and denitrification agent to be recycled.

Description

Technical field [0001] The invention belongs to the field of solid waste resource utilization, and particularly relates to a process and method for co-producing calcium oxide and sulfur by coal gasification and gypsum calcination. Background technique [0002] Disclosure of the background information is only intended to increase the understanding of the overall background of the present invention, and is not necessarily regarded as an acknowledgement or in any form suggesting that the information constitutes the prior art known to those of ordinary skill in the art. [0003] Desulfurization gypsum, also known as flue gas desulfurization gypsum, sulfur gypsum or FGD gypsum, has the same main composition as natural gypsum and is calcium sulfate dihydrate CaSO 4 ·2H 2 O, content ≥93%. Desulfurized gypsum is a by-product of the FGD process. The FGD process is a technology that uses lime-limestone to recover sulfur dioxide from coal or oil flue gas. The technology is to grind lime-lime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/10C01F11/46C01B17/04C10J3/48C10J3/50C10J3/82C10J3/46
Inventor 马春元夏霄张立强崔琳赵希强李军冯太
Owner SHANDONG UNIV
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