CN209854067U - Combined device for improving quality and efficiently utilizing semi-coke tail gas in whole process integration - Google Patents
Combined device for improving quality and efficiently utilizing semi-coke tail gas in whole process integration Download PDFInfo
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- CN209854067U CN209854067U CN201920401123.4U CN201920401123U CN209854067U CN 209854067 U CN209854067 U CN 209854067U CN 201920401123 U CN201920401123 U CN 201920401123U CN 209854067 U CN209854067 U CN 209854067U
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Abstract
The utility model discloses a full flow integrates and improves matter and high-efficient integrated device who utilizes semicoke tail gas, has solved the high, high value utilization, the equipment investment of influence semicoke tail gas of semicoke tail gas nitrogen content height, and the problem that running cost is high. The technical scheme includes that the device comprises a semi-coke oven, a tail gas outlet of the semi-coke oven is connected with a semi-coke tail gas purification system, the semi-coke tail gas purification system is respectively connected with a fuel inlet of the semi-coke oven and a decarburization unit of a chemical device, and a combustion-supporting gas inlet of the semi-coke oven is respectively connected with a carbon dioxide tail gas outlet of the decarburization unit and an oxygen generation station. The utility model discloses the system is simple, reduce nitrogen content in the semicoke tail gas effectively, improve semicoke tail gas quality, reduce chemical plant apparatus's equipment investment and running cost.
Description
Technical Field
The utility model relates to a coal chemical industry technical field, specific integrated device who improves matter and high-efficient semicoke tail gas that utilizes of full flow that says so.
Background
The semicoke is a solid carbonaceous product obtained by pyrolyzing low-metamorphic, non-caking or weak-caking high-volatile coal at medium and low temperature, a large amount of semicoke production coal is stored in the Jinan, Shaanxi, Mongolian and Ning junction areas in large quantity, and the semicoke can replace common coke and is widely applied to the industries of ferroalloy, calcium carbide, synthetic gas and the like.
The currently widely used semicoke production device is an internal heating type vertical retort furnace from a Lurgi retort furnace, the heat source of the dry distillation is from combustion flue gas of the dry distillation furnace tail gas and air, and coal is directly contacted with high-temperature flue gas for dry distillation to generate tar and coke oven gas. Due to the adoption of the medium-low temperature dry distillation technology, the coal tar which is a byproduct in the semi-coke production is low-temperature coal tar, the H/C (atomic ratio) of the coal tar is generally 1.2-1.49, and the coal tar is easy to hydrogenate and refine to produce high-value oil products such as naphtha, diesel and the like. The main components of the semicoke tail gas comprise: h2、CO、CO2、CH4、N2Etc. the content of nitrogen in the tail gas is high>40% v), low heat value (2000 kCal/Nm)3) The carbon monoxide content is more than 10 percent v, so the fuel is not suitable for residents, at present, most of the fuel is used as industrial fuel gas, is used for industries such as small-scale power generation, magnesium-aluminum processing and the like, and has low economic benefit. H2CO is an important basic chemical raw material, and a series of high-value chemical products can be produced by using the CO as the raw material, but N which is abundantly present in semicoke2Resulting in high denitrification cost. Therefore, the nitrogen in the semi-coke tail gas is removed at low cost, the high-value utilization of the semi-coke tail gas resource is realized, and the method has greater development potentialStrength and wide development prospect.
At present, there are two main processes for removing nitrogen in the semi-coke tail gas, one is a post-treatment process, and the purified semi-coke tail gas is denitrified by PSA, freezing and other processes. The method has the problems of large tail gas treatment capacity, high investment, high energy consumption and the like, and the denitrification cost is high and is not suitable for adoption through practical inspection; the other is a pre-treatment process, and the aim of reducing the content of nitrogen is fulfilled by reducing the nitrogen entering the semi-coke tail gas. The external heating type gas retort can isolate high-temperature flue gas containing nitrogen from semi-coke tail gas so as to obtain semi-coke tail gas with low nitrogen content, but the production scale of the external heating type gas retort cannot be enlarged, so that the external heating type gas retort is not suitable for large-scale application. At present, the technology of using oxygen-enriched or pure oxygen to replace air as a combustion improver to be burnt with fuel gas, reducing the nitrogen content in the high-temperature flue gas of the internal heating type gas retort and reducing the nitrogen content in the semi-coke tail gas attracts attention of researchers. One technical scheme is that a special pure oxygen burner is adopted for pure oxygen combustion, but the pure oxygen burner has high investment and is difficult to popularize; the technical scheme is that a dilution combustion technology is adopted, most researches are carried out at present by adopting steam as a dilution medium, but the steam consumption is high, the economy is poor, and meanwhile, the steam is easy to condense and damages a high-temperature flue.
Disclosure of Invention
The utility model aims at solving the technical problem, provide a system is simple, effectively reduce nitrogen content in the semicoke tail gas, improve semicoke tail gas and chemical product quality, reduce equipment investment and running cost's full flow integration and upgrade and the high-efficient integrated unit who utilizes semicoke tail gas.
The technical scheme includes that the device comprises a semi-coke oven, a tail gas outlet of the semi-coke oven is connected with a semi-coke tail gas purification system, the semi-coke tail gas purification system is respectively connected with a fuel gas inlet of the semi-coke oven and a decarburization unit of a chemical device, and a combustion-supporting gas inlet of the semi-coke oven is respectively connected with a carbon dioxide tail gas outlet of the decarburization unit and an oxygen outlet of an oxygen generation station.
The chemical device is a hydrogen production device, a methanol device, an ethylene glycol device, an ammonia synthesis device or a methanation device.
And a synthesis gas outlet of the decarburization unit is connected with a chemical product production unit.
Has the advantages that:
(1) the utility model integrates and utilizes the decarbonization unit of the chemical device, and introduces the semi-coke tail gas part of the semi-coke tail gas purification system into the decarbonization unit to remove the carbon dioxide brought in during the semi-coke preparation, thereby reducing the investment of the semi-coke tail gas upgrading equipment; pure oxygen is provided by the oxygen generation station to reduce the nitrogen content in the semi-coke tail gas and improve the quality of the semi-coke tail gas;
(2) the semi-coke tail gas from the semi-coke tail gas purification system is partially led back into the semi-coke oven to be used as fuel; the method comprises the following steps of providing pure oxygen as combustion-supporting gas by using an oxygen generation station, and ingeniously mixing the carbon dioxide tail gas of the byproduct of the decarburization unit with the pure oxygen for diluting the pure oxygen, stabilizing the production operation of a semicoke preparation device and solving the problem of high investment of a pure oxygen burner;
(3) the carbon dioxide mixed with the pure oxygen can also dilute the dry distillation heat carrier gas after being sent into the semicoke furnace, so that the carbon content in the heat carrier gas is improved, the yield of semicoke tail gas and tar is increased, and the economy of semicoke preparation is improved;
(4) because the addition of nitrogen in the combustion-supporting gas is directly reduced, the content of nitrogen in the semi-coke tail gas is reduced to be within 5% v from more than 45% v, and the quality of the semi-coke tail gas is improved.
Drawings
Fig. 1 is a structural diagram of the present invention.
Wherein, the system comprises a 1-semicoke furnace, a 2-semicoke tail gas purification system, a 3-decarburization unit, a 4-chemical product production unit and a 5-oxygen generation station.
Detailed Description
The invention will be further explained with reference to the drawings:
referring to fig. 1, a tail gas outlet of a semi-coke oven 1 is connected with a semi-coke tail gas purification system 2, the semi-coke tail gas purification system 2 is respectively connected with a fuel gas inlet of the semi-coke oven 1 and a decarburization unit 3 of a chemical device, and a combustion-supporting gas inlet of the semi-coke oven 1 is respectively connected with a carbon dioxide tail gas outlet of the decarburization unit 3 and an oxygen outlet of an oxygen generation station 5. And a synthesis gas outlet of the decarburization unit 3 is connected with a chemical product production unit 4. The utility model discloses in, hydrogen plant, methyl alcohol device, ethylene glycol device, synthetic ammonia device or methanation device etc. can be enumerated to the chemical plant device, all have the decarbonization unit among these chemical plant devices, integrate semicoke preparation and chemical production process through the full flow, make the semicoke tail gas of low calorific value can improve the matter for produce high value chemical products, created higher economic benefits, social and environmental benefit.
The process comprises the following steps:
referring to fig. 1, raw material coal is fed into a semi-coke oven 1, produced semi-coke products are discharged from the bottom of the semi-coke oven 1, semi-coke tail gas discharged from a tail gas outlet at the top of the semi-coke oven 1 is firstly fed into a semi-coke tail gas purification system 2 for purification treatment, then a part of the semi-coke tail gas is returned to a fuel gas inlet of the semi-coke oven 1 as fuel gas, the rest of the semi-coke tail gas is fed into a decarburization unit 3 of a chemical plant for removing carbon dioxide, and decarburized synthesis gas is fed into a chemical product production unit; carbon dioxide tail gas discharged from a carbon dioxide tail gas outlet of the decarburization unit 3 is mixed with pure oxygen from the oxygen generation station 5, the mixture is diluted with the pure oxygen and then is sent into a combustion-supporting gas inlet of the semicoke furnace 1 as combustion-supporting gas, in the semicoke furnace 1, the combustion-supporting gas and the fuel gas are mixed and combusted to generate heat carrier flue gas which is used as heat carrier gas required by semicoke preparation and is used for pyrolyzing raw material coal to generate semicoke, tar and semicoke tail gas.
Claims (3)
1. The combined device comprises a semi-coke oven and is characterized in that a tail gas outlet of the semi-coke oven is connected with a semi-coke tail gas purification system, the semi-coke tail gas purification system is respectively connected with a fuel gas inlet of the semi-coke oven and a decarburization unit of a chemical device, and a combustion-supporting gas inlet of the semi-coke oven is respectively connected with a carbon dioxide tail gas outlet of the decarburization unit and an oxygen outlet of an oxygen generation station.
2. The integrated upgrading and efficient semicoke tail gas utilization combined plant of claim 1, wherein the chemical plant is a hydrogen plant, a methanol plant, an ethylene glycol plant, an ammonia synthesis plant or a methanation plant.
3. The integrated upgrading and high-efficiency semicoke tail gas combined plant of claim 1 or 2, wherein a synthesis gas outlet of the decarburization unit is connected with a chemical product production unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920401123.4U CN209854067U (en) | 2019-03-27 | 2019-03-27 | Combined device for improving quality and efficiently utilizing semi-coke tail gas in whole process integration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920401123.4U CN209854067U (en) | 2019-03-27 | 2019-03-27 | Combined device for improving quality and efficiently utilizing semi-coke tail gas in whole process integration |
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| CN209854067U true CN209854067U (en) | 2019-12-27 |
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| CN201920401123.4U Active CN209854067U (en) | 2019-03-27 | 2019-03-27 | Combined device for improving quality and efficiently utilizing semi-coke tail gas in whole process integration |
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2019
- 2019-03-27 CN CN201920401123.4U patent/CN209854067U/en active Active
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