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Coal carbonization and coal catalytic cracking combined technological method

A catalytic cracking and combined process technology, used in special forms of dry distillation, direct heating dry distillation, petroleum industry and other directions, can solve the problems that are difficult to meet industrial and civil requirements, have not been properly solved, and the moisture content of semi-coke products is high, and achieve long-term performance. The effect of periodic operation, convenient control and high operating cost

Active Publication Date: 2016-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problems existing in the internal heating vertical carbonization furnace are: ① In order to ensure that the gas heat carrier passes through the coal smoothly, only lump coal with a thickness of 20-80mm can be used as raw material; The value is low, which makes it difficult to meet the requirements of industry and civil use, which has a huge impact on subsequent further processing and utilization; ③A large amount of coke quenching high-temperature wastewater is produced by using water-sealed cooling coke discharge method, and the semi-coke product has a high moisture content, which limits the semi-coke product. use, and drying semi-coke will waste a lot of gas; ④The coal material needs to stay for 4-7 hours from the top of the furnace into the carbonization chamber to the coke discharge, the output of a single furnace is low, and the unit investment per ton of coke is high
Therefore, the problem of CO in the regenerated flue gas has not been properly resolved

Method used

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  • Coal carbonization and coal catalytic cracking combined technological method
  • Coal carbonization and coal catalytic cracking combined technological method
  • Coal carbonization and coal catalytic cracking combined technological method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The catalytic cracking reaction is carried out on a small riser type catalytic cracking unit. The catalytic cracking catalyst used in the examples is an industrial equilibrium catalyst (see Table 1 for properties of the fresh catalyst). Hydrogenated residual oil (>350°C) is used as catalytic cracking raw material, the test conditions are: reaction temperature 520°C, solvent-oil ratio 6:1, space velocity 10h -1 . The operating data and flue gas composition of the regenerator are shown in Table 2. Lignite A from a certain area in northern Shaanxi was selected, and its industrial analysis is shown in Table 3. After the raw coal is crushed and screened, the coal powder <6mm is added to the riser dryer, and the raw coal is dried and lifted by the catalytic cracking and reheating flue gas at 753°C. The drying temperature is 150°C, and the dry coal powder enters the fluidization Bed dry distillation reactor, the circulating gas is heated to 620°C by the heating furnace, the...

Embodiment 2

[0045] The catalytic cracking reaction is carried out on a small riser type catalytic cracking unit. The catalytic cracking catalyst used in the examples is an industrial equilibrium catalyst (see Table 1 for properties of the fresh catalyst). Hydrogenated residual oil (>350°C) is used as catalytic cracking raw material, the test conditions are: reaction temperature 520°C, solvent-oil ratio 6:1, space velocity 10h -1 . The operating data and flue gas composition of the regenerator are shown in Table 5. Lignite A from a certain area in northern Shaanxi was selected, and its industrial analysis is shown in Table 3. After the raw coal is crushed and screened, the coal powder <6mm is added to the riser dryer, and the raw coal powder is dried and lifted by the catalytic cracking and reheating flue gas at 700°C. The drying temperature is 300°C, and the dry coal powder enters the flow stream. In the chemical bed dry distillation reactor, the circulating gas is heated to 680°C by t...

Embodiment 3

[0055] Feed trifluoroacetic acid vapor into the heat carrier fed with water vapor, the volume content of trifluoroacetic acid vapor in the heat carrier is 2%, the rest are the same as in Example 1, and the product distribution is shown in Table 9.

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Abstract

The invention discloses a coal carbonization and catalytic cracking combined technological method. feed coal is crushed and sieved, and then enters a preheating dryer, feed coal is dried and dewatered by catalytic cracking second regenerator flue gas and then enters a fluidized bed carbonization reactor, a mixture of catalytic cracking second regenerator flue gas burning produced high temperature flue gas, water and heated cyclic coal gas is taken as a heat carrier, under the conditions of 0.1-0.4MPa (absolute) and 500-750DEG C, pyrolytic reaction is carried out to generate coal gas, tar and semicoke. After gasification, the volume content of added water in the heat carrier is 1-20v%, preferably 3-10v%. The method organically combines coal chemical industry with petroleum refining technology, not only increases the tar yield, improves the calorific value of coal gas, but also realizes high efficiency cascaded utilization of energy.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, and in particular relates to a combined process of coal dry distillation and catalytic cracking. Background technique [0002] The low-temperature dry distillation of coal refers to the low-temperature pyrolysis of lignite or young bituminous coal heated to 500-750°C in the absence of air to generate semi-coke, tar and gas. The existing low-temperature dry distillation production process mainly adopts the internal heating vertical carbonization furnace, which was invented in China, the patent number: ZL200610111733.8 and the Chinese invention patent, application number: 200610137759. Drying section, dry distillation section and cooling section; the furnace adopts a large cavity design, and adopts internal combustion and internal heating heating schemes. After the furnace gas is mixed with air, it enters the flower wall in the furnace, and is ejected and burned through the flower wall h...

Claims

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Application Information

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IPC IPC(8): C10B49/10C10B49/06C10B49/02C10B57/10C10B53/04C10B53/06C10B53/02C10G55/06
CPCY02E50/10
Inventor 张庆军刘文洁王鑫张彪刘继华张忠清
Owner CHINA PETROLEUM & CHEM CORP
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