CN110950309B - Petroleum coke and gypsum calcination and carbon thermal reduction system and method - Google Patents
Petroleum coke and gypsum calcination and carbon thermal reduction system and method Download PDFInfo
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- CN110950309B CN110950309B CN201911144067.1A CN201911144067A CN110950309B CN 110950309 B CN110950309 B CN 110950309B CN 201911144067 A CN201911144067 A CN 201911144067A CN 110950309 B CN110950309 B CN 110950309B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0473—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by reaction of sulfur dioxide or sulfur trioxide containing gases with reducing agents other than hydrogen sulfide
- C01B17/0482—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by reaction of sulfur dioxide or sulfur trioxide containing gases with reducing agents other than hydrogen sulfide with carbon or solid carbonaceous materials
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
- C01F11/08—Oxides or hydroxides by reduction of sulfates
Abstract
The invention discloses a system and a method for calcining petroleum coke and gypsum and reducing carbon heat, wherein the system comprises a calcining furnace, a heat exchanger and a heat exchanger, wherein the calcining furnace is divided into an upper section and a lower section, the upper section is an oxidation calcining area, the lower section is a reduction calcining area, the upper section is connected with the lower section, and an oxygen-containing gas inlet is arranged at the joint; the lower section is respectively connected with a gypsum source and a petroleum coke source; the gas inlet of the carbon heat reduction tower is connected with the gas outlet of the calcining furnace through a high-temperature separator, the solid inlet of the carbon heat reduction tower is connected with a petroleum coke source, and the solid outlet of the carbon heat reduction tower is connected with the calcining furnace; and a gas inlet of the sulfur recovery device is connected with a gas outlet of the charcoal heat reduction tower. The method can solve the problem that low-grade industrial gypsum (mainly calcium sulfate) and high-sulfur carbon materials in China are difficult to treat, and can realize cooperative resource utilization and recover high-quality sulfur and calcium oxide. The current situation of shortage of sulfur resources in China is relieved, and the external dependence of the sulfur resources is reduced. In addition, the calcium oxide can replace limestone as a desulfurizing agent for wet desulphurization.
Description
Technical Field
The invention relates to the technical field of solid waste resource utilization, in particular to a process and a method for petroleum coke cooperated with gypsum calcination and carbon thermal reduction.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the high concentration of phosphate fertilizer and phosphate fertilizerThe rapid development of the phosphoric acid industry, the yield of the byproduct phosphogypsum is increased sharply. At present, the annual emission amount of phosphogypsum in China is nearly hundred million tons, and the accumulated accumulation amount is nearly 5 hundred million tons. With the continuous improvement of the environmental protection requirement in China, the sulfur-containing flue gas discharged by coal-fired power plants, steel plants and the like needs to be provided with a flue gas desulfurization device, wherein a wet desulfurization unit mainly based on a limestone-gypsum method accounts for about 85% of the total installed capacity. At present, the annual output of the desulfurized gypsum in China is about one hundred million tons, the components of the desulfurized gypsum are similar to that of phosphogypsum, and the main component is CaSO4·2H2And O. The industrial gypsum contains acidic and harmful substances, and must be specially stacked, so that the land occupation is large, the resources are wasted, and the long-term stacking of the industrial gypsum can pollute underground water and cause secondary pollution.
Petroleum coke is a product formed by separating light oil from heavy oil through distillation of crude oil, and then carrying out a thermal cracking process on the heavy oil, wherein sulfur is one of impurities affecting the quality of the petroleum coke, the sulfur content of the petroleum coke depends on the sulfur content of residual oil, 30-40% of sulfur in the residual oil is remained in the petroleum coke, and the sulfur in the petroleum coke can be divided into organic compounds (thioether, mercaptan, sulfonic acid and the like) of sulfur and inorganic compounds (ferric sulfide and sulfate) of sulfur. Generally, the desulfurization effect is not large when the petroleum coke is calcined to about 1300 ℃, the desulfurization effect can be obvious only when the calcination temperature is increased to about 1450 ℃, and the petroleum coke is difficult to utilize at present.
The sulfur has the lowest molecular weight and high unit value in all sulfur-containing products; the storage and transportation cost is low; and the sulfur can be used as a production raw material of most sulfur-containing products, and the application is wide. China is a country with shortage of sulfur resources, the import quantity and the consumption quantity of sulfur are in the forefront of the world every year, the external dependence is high, the sulfur is used as one of important chemical raw materials, and the market value and the application value of the sulfur are far higher than those of sulfuric acid.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide a system and a method for calcining petroleum coke and gypsum and performing carbon thermal reduction, which can solve the problem that low-grade industrial gypsum (mainly calcium sulfate) and petroleum coke in China are difficult to treat, and can realize cooperative resource utilization and recover high-quality sulfur and calcium oxide. The current situation of shortage of sulfur resources in China is relieved, and the external dependence of the sulfur resources is reduced. In addition, the calcium oxide can replace limestone as a desulfurizer for wet desulphurization, thereby reducing the exploitation of limestone resources and protecting the ecological environment.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a system for calcining petroleum coke and calcining gypsum and reducing the petroleum coke by using carbon heat comprises:
the calcining furnace is divided into an upper section and a lower section, the upper section is an oxidation calcining zone, the lower section is a reduction calcining zone, the upper section is connected with the lower section, and an oxygen-containing gas inlet is arranged at the joint;
the lower section is respectively connected with a gypsum source and a petroleum coke source;
the gas inlet of the carbon heat reduction tower is connected with the gas outlet of the calcining furnace, the solid inlet of the carbon heat reduction tower is connected with the petroleum coke source, and the solid outlet of the carbon heat reduction tower is connected with the calcining furnace;
and a gas inlet of the sulfur recovery device is connected with a gas outlet of the charcoal heat reduction tower through a high-temperature separator, and is used for providing an environment for condensing and recovering sulfur.
The calcining furnace is divided into two sections, the lower part is a reduction calcining zone, the zone has high reduction potential, the CaS powder is calcined in the temperature range of 600-900 ℃, the produced CaS powder is conveyed to the upper part of the calcining furnace and reacts with oxygen at high temperature (more than 700 ℃) to produce CaO and high-concentration SO2A gas. The change of the calcining mechanism has lower reaction temperature than the original calcining mode, and simultaneously, the sintering of CaO powder is reduced due to the reduction of the reaction temperature, so that CaO has higher desulfurization activity.
And a solid outlet of the carbon heat reduction tower is connected with the calcining furnace and is used for conveying the dead coke generated by the petroleum coke in the carbon heat reduction tower to the calcining furnace to be used as a catalyst and a reducing agent. Tests show that the spent coke generated after the sulfur dioxide is thermally reduced by petroleum coke carbon is added into a calcining furnace and can effectively reduce the decomposition temperature and the decomposition time of calcium sulfate when used as a catalyst for the synergistic calcination of gypsum and petroleum coke, so that the decomposition temperature of the calcium sulfate is matched with the optimal temperature of the process for preparing sulfur by the sulfur dioxide through the thermal reduction of the carbon, a flue gas treatment device between the calcining furnace and a thermal reduction tower is omitted, and the equipment investment is saved.
In addition, the recycling of the petroleum coke spent coke can obviously improve the decomposition efficiency of gypsum, the desulfurization efficiency of the petroleum coke and the concentration of sulfur dioxide in flue gas, thereby improving the quality of calcined product calcium oxide and the yield of sulfur. When the spraying slurry prepared from the high-quality calcium oxide is used for flue gas desulfurization, the flue gas desulfurization effect can be improved.
In some embodiments, a gypsum preheater is connected between the calciner and the gypsum source. The gypsum is preheated to better carry out calcination decomposition.
In some embodiments, a calcium oxide bin is also included, the calcium oxide bin being connected to the product outlet of the calciner. The calcium oxide storage bin is used for storing the co-calcined product of the gypsum and the petroleum coke.
Further, a calcium oxide cooling device is connected between the calcium oxide storage bin and the calcining furnace. Used for cooling the calcined product, and is convenient to store after being cooled.
In some embodiments, the high temperature flue gas generated by the burner is indirectly heat exchanged with the mixture of gypsum and petroleum coke in the calciner.
A method for calcining petroleum coke in cooperation with gypsum and reducing the petroleum coke by using carbon heat comprises the following steps:
adding the preheated gypsum and petroleum coke into a reduction calcining zone of a calcining furnace for calcining, wherein the petroleum coke and the gypsum are calcined according to C/CaSO4Adding the effective components at a molar ratio of 5-20:1, wherein the calcined product is CaS powder;
the CaS powder is sent to an oxidation calcining zone of a calcining furnace and reacts with introduced oxygen-containing gas at high temperature to generate CaO and high-concentration SO2A gas;
high concentration of SO2The gas is deliveredThe obtained product is sent to a carbothermic reduction tower to be carbothermic reduced with petroleum coke to obtain elemental sulfur and spent coke;
the spent coke is conveyed to a reduction calcination zone of a calciner as a catalyst for the co-calcination of gypsum and petroleum coke.
When petroleum coke and gypsum are in accordance with C/CaSO4When the molar ratio of the effective components is 5-20:1, CO in the calcining flue gas is added2The ratio of the partial pressure to the partial pressure of the reducing gas is less than 10, the calcined product of the gypsum is CaS powder, and the calcination temperature in the step is lower and is 600-900 ℃.
In some embodiments, the oxygen-containing gas has an oxygen concentration of 1% to 40%.
In some embodiments, the temperature of the reduction calcination zone calcination is 600-900 ℃.
In some embodiments, the temperature of the calcination in the oxidative calcination zone is 700-1100 ℃.
In some embodiments, the petroleum coke and the flue gas in the carbon thermal reduction tower are in accordance with effective components C/SO2The molar ratio is 1-5: 1 was added.
In some embodiments, the temperature of the carbothermic reduction is from 700 ℃ to 1000 ℃.
The temperature of the carbothermic reduction is slightly lower than the calcining temperature in the calcining furnace, so that the gas product in the calcining furnace is directly introduced into the carbothermic reduction tower after being separated by the high-temperature separator to remove solids, the carbothermic reduction is carried out, the conversion rate of sulfur dioxide can be better improved, the sulfur yield is improved, the burden of subsequent flue gas desulfurization is reduced, and the industrial cost is saved.
In some embodiments, the temperature of the preheated gypsum is from 300 ℃ to 700 ℃.
The invention has the beneficial effects that:
under the catalytic action of the spent coke of the sulfur dioxide thermally reduced by the petroleum coke, the petroleum coke synergistically decomposes the gypsum, greatly reduces the decomposition temperature of the calcium sulfate, improves the decomposition efficiency of the calcium sulfate and the yield of calcium oxide, and improves the desulfurization efficiency of the petroleum coke.
The solid waste calcium sulfate is recycled to produce high-value sulfur and calcium oxide, and the calcium oxide can replace limestone as a raw material of the desulfurization and denitrification agent;
the calcining furnace adopts the indirect heat exchange form of the mixture of the hot flue gas, the gypsum and the petroleum coke, SO that the SO in the high-temperature flue gas decomposed by the calcium sulfate is improved2The concentration improves the economy of the downstream carbon thermal reduction process;
the spent coke discharged by the carbothermic reduction process is used as a catalyst for decomposing calcium sulfide, so that the problem that the spent coke generated by the carbothermic reduction technology is difficult to treat is solved, the consumption of high-quality carbon materials is reduced, resources are saved, and the economy is improved;
petroleum coke is used as a catalyst for gypsum calcination, and during calcination, a sulfur-containing complex which is difficult to desorb in a high-sulfur carbon material is pyrolyzed and released, SO that SO in flue gas is increased2Or S2The steam concentration increases the recovery amount of sulfur and improves the sulfur yield;
the process provides a brand-new sustainable pollution-free treatment mode for the industrial gypsum and the high-sulfur carbon material solid waste which are difficult to treat at present, realizes the resource utilization of the industrial gypsum, can relieve the current situation of the shortage of sulfur resources in China, reduces the external dependence of the sulfur resources, can replace limestone as a raw material of a desulfurization and denitrification agent by the by-product calcium oxide, reduces the exploitation of the limestone and protects the ecological environment, and therefore, the process has wide market prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a system for calcining petroleum coke and reducing gypsum by using carbon heat in cooperation with the petroleum coke.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention is further illustrated by the following examples:
a method for calcining petroleum coke in cooperation with gypsum and reducing by using charcoal heat mainly comprises the following steps:
gypsum (with particle size of 60 μm-3mm, and can be natural gypsum, phosphogypsum, desulfurized gypsum or their mixture, etc.) is stored in a gypsum storage bin, and is firstly conveyed to a gypsum preheater (gypsum preheater, and can be solid preheaters in various forms such as multi-stage cyclone separator series connection, etc.) for preheating and drying by accurately controlling the feeding amount through a feeder, the heating medium is waste heat flue gas discharged by an indirect heating calciner, the temperature of the waste heat flue gas is 900-1300 ℃, and the main component is N2、CO2、H2O, preheating gypsum to 300-700 ℃ from normal temperature;
the preheated and dried semi-hydrated gypsum enters a reduction calcining zone of a calcining furnace and is mixed with petroleum coke (the grain diameter is 60 mu m-3mm) in the reduction calcining zone of the calcining furnace according to the C/CaSO4The effective components are added at a molar ratio of 5-20:1, and are mixed with high temperature flue gas (main component is N) generated by a combustor2S steam, SO2、CO、CO2Etc.) indirect heat exchange, and the reaction is carried out at the temperature range of 600-900 ℃, the reaction time is 10-60 min, and the main component of the reaction solid product is CaS powder.
The CaS powder is sent to an oxidation calcining zone of a calcining furnace and reacts with the introduced oxygen at the temperature of 700-1100 ℃ to generate CaO powder and high-concentration SO2Gas, high concentration SO2SO in gas2The content is 5-40%.
One part of calcium oxide powder can be mixed with coal powder and enter a furnace for combustion to carry out in-furnace desulfurization, and the desulfurization temperature in the calcium oxide furnace is 800-1200 ℃. One part can be sent into a flue gas purification system, and a limestone wet desulphurization process, a semi-dry desulphurization process or a dry desulphurization process is selected according to production process conditions; the flue gas generated by the calcining furnace and the desulfurized flue gas in the furnace are purified by a flue gas purification system and then are exhausted;
high concentration SO discharged from calcining furnace2Introducing flue gas into a carbon thermal reduction system (the main equipment is a carbon thermal reduction tower, a high-temperature separator and the like, the carbon thermal reduction tower can be in various forms such as an entrained flow bed, a bubbling bed, a micro fluidized bed, a spouted bed, a fixed bed, a moving bed and the like), and introducing SO into a carbon thermal reduction system2The smoke with the content of 5 to 40 percent and the petroleum coke are subjected to oxidation-reduction reaction and SO reaction at the temperature of between 700 and 1000 DEG C2Reduced by petroleum coke into elemental sulfur steam; reducing gas containing elemental sulfur steam (temperature 800-1100 deg.C, main component is N2S steam, CO2Etc.) is first fed into a high-temperature separator for gas-solid separation, the surfaces of the separated solid carbon material particles contain difficultly decomposed sulfur-containing complexes (including sulfur organic compounds (thioether, mercaptan, sulfonic acid, etc.) and sulfur inorganic compounds (iron sulfide, sulfate), etc.), the treatment capacity is accurately controlled by a feeder, and exhaust gas (the main component is N) is reduced by carbon heat2、CO、CO2Etc.) the gas phase is fed to a calciner as a catalyst for the calcination decomposition of the gypsum.
Reducing gas from a high-temperature separator (which can be a high-temperature cyclone separator, a high-temperature axial flow separator, a high-temperature ceramic filter and other separators in various forms) enters a reheater to be cooled, the temperature of the reducing gas is reduced from 800-1100 ℃ to 450-500 ℃, a cooling medium is exhaust gas, and the temperature of the exhaust gas is increased from 50-90 ℃ to 350-400 ℃; the reduced reducing gas enters a fine dust removal device (which can be a metal mesh filter, a ceramic filter and other fine dust removal filters in various forms), solid powder with smaller particle size in the reducing gas is removed, and the separated solid powder is returned to a combustor to be burnt as fuel; the reduced gas after dust removal enters a sulfur recovery system (the sulfur recovery system mainly comprises a reheater, a sulfur recovery device, a sulfur storage tank and other equipment) to recover sulfur, the collected sulfur is stored in the sulfur storage tank, and the sulfur is recoveredThe temperature of the exhausted gas after being sulfonated is reduced from 200 ℃ to 300 ℃ to 50 ℃ to 90 ℃ after being dehydrated by a steam cooler, after the exhausted gas is heated to 350 ℃ to 400 ℃ by the reducing gas cooling waste heat in a reheater, one part of the exhausted gas is used as carrier gas to carry carbon thermal reduction exhausted coke and is conveyed to a calcining furnace to be used as a gypsum calcining catalyst, the other part of the exhausted gas is used as temperature regulating gas to return to a carbon thermal reduction tower to regulate the reaction temperature, and other sulfur-containing byproducts (H) in the carbon thermal reduction process are inhibited2S、COS、CS2Etc.).
The feeder can be a screw feeder, a gas-locking feeder and other feeding forms.
The gas conveying process is provided with conveying power by an induced draft fan or a blower.
The air locking feeders are arranged at the outlet of the gypsum storage bin, the outlet of the high-sulfur carbon material storage bin and the carbon thermal reduction spent coke discharge pipeline, so that the sealing performance of the system is ensured while the material conveying amount is accurately controlled.
Reducing gas is subjected to gas-solid pre-separation through a high-temperature separator, large-particle coke depletion is separated, the reducing gas is cooled through a reheater and enters a fine powder separator for secondary dust removal, and sulfur is condensed and recovered through a sulfur condenser. The purity of the recovered sulfur reaches more than 99.7 percent and meets the first-class standard of industrial sulfur.
Example 1
The particle size of the desulfurized gypsum is 60 mu m-3mm, the desulfurized gypsum is firstly conveyed to a gypsum preheater by accurately controlling the feeding amount through a feeding machine, the desulfurized gypsum is preheated to 500 ℃, and preheating and drying are carried out. Adding the preheated semi-hydrated gypsum into a reduction calcining zone of a calcining furnace, wherein the petroleum coke and the gypsum (the particle size is 60 mu m-3mm) are in accordance with C/CaSO4The mole ratio of the effective components is 20:1, and indirectly exchanging heat with high-temperature flue gas after mixing, and calcining at 800 ℃ for 40 min. The calcined solid product was CaS powder. The CaS powder is sent to an oxidation calcining zone of a calcining furnace and reacts with introduced oxygen at 700 ℃ to generate CaO and high-concentration SO2A gas. High concentration of SO2Gas (SO)2The content is 20 percent) is put into a carbothermic reduction furnace to be carbothermic reduced with petroleum coke, and the petroleum coke and flue gas are subjected to carbothermic reduction according to the effective components of C/SO2Adding the raw coke with the molar ratio of 2:1, conveying the generated dead coke to a calcining furnace to participate in calciningAnd (4) reacting.
In the calcining furnace, the content of calcium oxide in the solid product is 95 percent (mass percentage), and the decomposition rate of the desulfurized gypsum is about 99 percent.
Example 2
The particle size of the phosphogypsum is 60 mu m-3mm, the feeding amount is accurately controlled by a feeding machine and is conveyed to a gypsum preheater, the temperature is preheated to 500 ℃, and preheating and drying are carried out. Adding the preheated phosphogypsum into a reduction calcining zone of a calcining furnace, wherein the petroleum coke and the gypsum (the grain diameter is 60 mu m-3mm) are in accordance with C/CaSO4The molar ratio of the effective components is 10: 1, and indirectly exchanging heat with high-temperature flue gas after mixing, and calcining at 650 ℃ for 20 min. The calcined solid product was CaS powder. The CaS powder is sent to an oxidation calcining zone of a calcining furnace and reacts with introduced oxygen at 750 ℃ to generate CaO and high-concentration SO2A gas. High concentration of SO2Gas (SO)210 percent) of the total content of the components enter a carbothermic reduction furnace to be carbothermic reduced with petroleum coke, and the petroleum coke and flue gas are subjected to carbothermic reduction according to the effective components of C/SO2The molar ratio is 4:1, and the generated dead coke is conveyed to a calcining furnace to participate in the calcining reaction.
In the calcining furnace, the content of calcium oxide in the solid product is 93%, and the decomposition rate of the desulfurized gypsum is 98.5%.
Example 3
The particle size of the natural gypsum is 60 mu m-3mm, the natural gypsum is firstly conveyed to a gypsum preheater by accurately controlling the feeding amount through a feeding machine, and the natural gypsum is preheated to 700 ℃ for preheating and drying. Adding the preheated natural gypsum into a reduction calcining zone of a calcining furnace, wherein the petroleum coke and the gypsum (the particle size is 60 mu m-3mm) are in accordance with C/CaSO4The mole ratio of the effective components is 5: 1, and indirectly exchanging heat with high-temperature flue gas after mixing, and calcining at 850 ℃ for 20 min. The calcined solid product was CaS powder. The CaS powder is sent to an oxidation calcining zone of a calcining furnace and reacts with introduced oxygen at 800 ℃ to generate CaO and high-concentration SO2A gas.
High concentration of SO2Gas (SO)230 percent) of the total content of the components enter a carbothermic reduction furnace to be carbothermic reduced with petroleum coke, and the petroleum coke and flue gas are subjected to carbothermic reduction according to the effective components of C/SO2Mole ofThe addition is carried out according to the ratio of 1:1, and the generated spent coke is conveyed to a calcining furnace to participate in the calcining reaction.
In the calcining furnace, the content of calcium oxide in the solid product is 96 percent, and the decomposition rate of the desulfurized gypsum is 99 percent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A system for calcining petroleum coke in cooperation with gypsum and reducing by using charcoal heat is characterized in that: the method comprises the following steps:
the calcining furnace is divided into an upper section and a lower section, the upper section is an oxidation calcining zone, the lower section is a reduction calcining zone, the upper section is connected with the lower section, and an oxygen-containing gas inlet is arranged at the joint;
the lower section is respectively connected with a gypsum source and a petroleum coke source;
the gas inlet of the carbon heat reduction tower is connected with the gas outlet of the calcining furnace, the solid inlet of the carbon heat reduction tower is connected with the petroleum coke source, and the solid outlet of the carbon heat reduction tower is connected with the calcining furnace;
and a gas inlet of the sulfur recovery device is connected with a gas outlet of the charcoal heat reduction tower through a high-temperature separator, and is used for providing an environment for condensing and recovering sulfur.
2. The system for calcining petroleum coke and reducing gypsum and carbon heat in cooperation with the petroleum coke as claimed in claim 1, wherein: and a gypsum preheater is connected between the calcining furnace and the gypsum source.
3. The system for calcining petroleum coke and reducing gypsum and carbon heat in cooperation with the petroleum coke as claimed in claim 1, wherein: the calcium oxide storage bin is connected with a product outlet of the calcining furnace.
4. The system for calcining petroleum coke and reducing gypsum and carbon heat in cooperation with the petroleum coke as claimed in claim 3, wherein: and a calcium oxide cooling device is connected between the calcium oxide storage bin and the calcining furnace.
5. The system for calcining petroleum coke and reducing gypsum and carbon heat in cooperation with the petroleum coke as claimed in claim 1, wherein: in the calcining furnace, the mixture of the high-temperature flue gas generated by the burner and the gypsum and the petroleum coke adopts an indirect heat exchange mode.
6. A method for calcining petroleum coke in cooperation with gypsum and reducing by using charcoal heat is characterized in that: the method comprises the following steps:
adding the preheated gypsum and petroleum coke into a reduction calcining zone of a calcining furnace for calcining, wherein the petroleum coke and the gypsum are calcined according to C/CaSO4Adding the effective components at a molar ratio of 5-20:1, wherein the calcined product is CaS powder;
the CaS powder is sent to an oxidation calcining zone of a calcining furnace and reacts with introduced oxygen-containing gas at high temperature to generate CaO and high-concentration SO2A gas;
high concentration of SO2Conveying the gas into a carbothermic reduction tower, and carrying out carbothermic reduction on the gas and the petroleum coke to obtain a sulfur simple substance and spent coke;
the spent coke is conveyed to a reduction calcination zone of a calciner as a catalyst for the co-calcination of gypsum and petroleum coke.
7. The method of claim 6, wherein the petroleum coke is used in conjunction with the calcination of gypsum and the carbothermic reduction, and the method comprises the following steps: the calcining temperature of the reduction calcining zone is 600-900 ℃.
8. The method of claim 6, wherein the petroleum coke is used in conjunction with the calcination of gypsum and the carbothermic reduction, and the method comprises the following steps: the calcining temperature of the oxidizing calcining zone is 700-1100 ℃.
9. The method of claim 6, wherein the petroleum coke is used in conjunction with the calcination of gypsum and the carbothermic reduction, and the method comprises the following steps: the temperature of the carbothermic reduction is 700-1000 ℃.
10. The method of claim 6, wherein the petroleum coke is used in conjunction with the calcination of gypsum and the carbothermic reduction, and the method comprises the following steps: the oxygen concentration of the oxygen-containing gas is 1-40%.
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