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A system and method for synergistic gypsum calcination and carbon thermal reduction of petroleum coke

A petroleum coke and gypsum technology, applied in chemical instruments and methods, sulfur preparation/purification, inorganic chemistry, etc., can solve the problems of petroleum coke that is difficult to handle, and achieve the effects of saving consumption, saving resources, and improving economy

Active Publication Date: 2021-05-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the technical problems raised in the above-mentioned prior art, the purpose of the present invention is to provide a system and method for petroleum coke synergistic gypsum calcination and carbon thermal reduction, which can not only solve the problem of low-grade industrial gypsum (mainly calcium sulfate) and petroleum coke in China Difficult to deal with, but also can make it co-resource utilization, recovery of high-quality sulfur and calcium oxide

Method used

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  • A system and method for synergistic gypsum calcination and carbon thermal reduction of petroleum coke

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Experimental program
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Effect test

Embodiment 1

[0057] The particle size of the desulfurized gypsum is 60μm-3mm. Firstly, it is sent to the gypsum preheater through the feeder to accurately control the feeding amount, and is preheated to 500°C for preheating and drying. The preheated hemihydrate gypsum is added to the reduction calcination zone of the calciner, and petroleum coke and gypsum (particle size 60μm-3mm) are mixed according to C / CaSO 4 After the molar ratio of effective components is 20:1, it is mixed with high-temperature flue gas for indirect heat exchange, and then calcined. The calcining temperature is 800°C, and the calcining time is 40 minutes. The calcined solid product is CaS powder. The CaS powder is sent to the oxidation calcination zone of the calciner, and reacts with the incoming oxygen at 700°C to generate CaO and high-concentration SO 2 gas. high concentration SO 2 Gas (SO 2 content of 20%) into the carbon thermal reduction furnace, and petroleum coke for carbon thermal reduction, petroleum cok...

Embodiment 2

[0060] The particle size of phosphogypsum is 60μm-3mm. Firstly, the feeding amount is accurately controlled by the feeder and sent to the gypsum preheater, and it is preheated to 500°C for preheating and drying. The preheated phosphogypsum is added to the reduction calcination zone of the calciner, petroleum coke and gypsum (particle size 60μm-3mm) are mixed according to C / CaSO 4 The active components are mixed at a molar ratio of 10:1, and then indirect heat exchange with high-temperature flue gas for calcination. The calcination temperature is 650°C and the calcination time is 20 minutes. The calcined solid product is CaS powder. The CaS powder is sent to the oxidation calcination zone of the calciner, and reacts with the incoming oxygen at 750°C to generate CaO and high-concentration SO 2 gas. high concentration SO 2 Gas (SO 2 content of 10%) into the carbon thermal reduction furnace, and petroleum coke for carbon thermal reduction, petroleum coke and flue gas according...

Embodiment 3

[0063] The particle size of the natural gypsum is 60μm-3mm. Firstly, the feeding amount is accurately controlled by the feeder and sent to the gypsum preheater, and it is preheated to 700°C for preheating and drying. The preheated natural gypsum is added to the reduction calcination zone of the calciner, and petroleum coke and gypsum (particle size 60μm-3mm) are mixed according to C / CaSO 4 After the molar ratio of effective components is 5:1, it is mixed with high-temperature flue gas for indirect heat exchange, and then calcined. The calcining temperature is 850°C, and the calcining time is 20 minutes. The calcined solid product is CaS powder. The CaS powder is sent to the oxidation calcination zone of the calciner, and reacts with the incoming oxygen at 800°C to generate CaO and high-concentration SO 2 gas.

[0064] high concentration SO 2 Gas (SO 2 content of 30%) into the carbon thermal reduction furnace, and petroleum coke for carbon thermal reduction, petroleum coke ...

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Abstract

The invention discloses a system and method for petroleum coke synergistic gypsum calcination and charcoal thermal reduction. The system and the calcination furnace are divided into an upper section and a lower section, the upper section is an oxidation calcination area, and the lower section is a reduction calcination area. An oxygen-containing gas inlet is provided; the lower section is respectively connected with the gypsum source and the petroleum coke source; the carbon thermal reduction tower, its gas inlet is connected with the gas outlet of the calciner through a high-temperature separator, its solid inlet is connected with the petroleum coke source, and its solid outlet It is connected with the calciner; the gas inlet of the sulfur recovery device is connected with the gas outlet of the carbon thermal reduction tower. Not only can it solve the problem that low-grade industrial gypsum (mainly calcium sulfate) and high-sulfur carbon materials in China are difficult to handle, but it can also make them collaborative resource utilization and recover high-quality sulfur and calcium oxide. Alleviate the current situation of shortage of sulfur resources in our country and reduce the foreign dependence on sulfur resources. In addition, calcium oxide can replace limestone as a desulfurization agent for wet desulfurization.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a process and method for cooperating petroleum coke with gypsum calcination and charcoal thermal reduction. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the rapid development of my country's high-concentration phosphate fertilizer and phosphoric acid industry, the output of by-product phosphogypsum has increased dramatically. At present, the annual discharge of phosphogypsum in my country is nearly 100 million tons, and the cumulative accumulation is nearly 500 million tons. With the continuous improvement of my country's environmental prot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/04C01F11/08
CPCC01B17/0482C01F11/08
Inventor 马春元夏霄张立强赵希强李军冯太
Owner SHANDONG UNIV
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