Method for increasing tar yield by coupling aromatization of hydrocarbons with coal pyrolysis

A technology of tar yield and aromatization, applied in the energy field, can solve the problem of no effect, etc., and achieve the effects of easy recycling, reducing costs, and improving tar yield.

Active Publication Date: 2011-08-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It was found that only the pretreatment of coal samples with hydrogen at 2-3 MPa and 350-400 °C can increase the tar yield to a certain extent, and other gas pretreatments have no effect on increasing the pyrolysis tar yield (Cypres et al. , Fuel Process, Technol, 1988, 20: 337)

Method used

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  • Method for increasing tar yield by coupling aromatization of hydrocarbons with coal pyrolysis
  • Method for increasing tar yield by coupling aromatization of hydrocarbons with coal pyrolysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mo / HZSM-5 is selected as the catalyst, and its preparation method is: soak the ammonium molybdate solution on the HZSM-5 powder, immerse at room temperature for 16 hours, dry at 120°C for 4 hours, bake at 500°C for 6 hours, form into tablets, and screen out 20-40 mesh particles.

[0023] The selected coal is Shenmu coal, and its industrial analysis and elemental analysis are shown in Table 1. The test uses 5g of coal, 1g of catalyst, the pyrolysis conditions are temperature 700°C, constant temperature time 30min, pressure 0.1MPa, reaction gas 25ml / minCH 4 , into the reactor through the gas inlet. After passing through the catalyst layer and then entering the coal seam, the liquid product generated by pyrolysis is taken out of the reactor with the gas and collected by a cold trap (-20°C). Separation of oil and water according to ASTM D95-83 method. The resulting tar yield was 21.5 wt.% daf and the semi-char yield was 65.6 wt.% daf.

Embodiment 2

[0025] Mo / HZSM-5 is selected as the catalyst, and its preparation method is: soak the ammonium molybdate solution on the HZSM-5 powder, immerse at room temperature for 16 hours, dry at 120°C for 4 hours, bake at 500°C for 6 hours, form into tablets, and screen out 20-40 mesh particles.

[0026] The selected coal is Shenmu coal, and its industrial analysis and elemental analysis are shown in Table 1. The test uses 5g of coal, 1g of catalyst, the pyrolysis conditions are temperature 700°C, constant temperature time 30min, pressure 0.1MPa, reaction gas 60ml / min CH4, enter the reactor from the gas inlet. After passing through the catalyst layer and then entering the coal seam, the liquid product generated by pyrolysis is taken out of the reactor with the gas and collected by a cold trap (-20°C). Separation of oil and water according to ASTM D95-83 method. The tar yield thus obtained was 19.0 wt.% daf, and the semi-char yield was 66.1 wt.% daf.

Embodiment 3

[0028] Mo / HZSM-5 is selected as the catalyst, and its preparation method is: soak the ammonium molybdate solution on the HZSM-5 powder, immerse at room temperature for 16 hours, dry at 120°C for 4 hours, bake at 500°C for 6 hours, form into tablets, and screen out 20-40 mesh particles.

[0029]The selected coal is Shenmu coal, and its industrial analysis and elemental analysis are shown in Table 1. The test uses 5g of coal, 1g of catalyst, the pyrolysis conditions are temperature 750°C, constant temperature time 30min, pressure 0.1MPa, reaction gas 25ml / min CH4, enter the reactor from the gas inlet. After passing through the catalyst layer and then entering the coal seam, the liquid product generated by pyrolysis is taken out of the reactor with the gas and collected by a cold trap (-20°C). Separation of oil and water according to ASTM D95-83 method. The tar yield thus obtained was 20.8 wt.% daf and the semi-char yield was 64.9 wt.% daf.

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Abstract

The utility model provides a method for increasing tar yield by coupling aromatization of hydrocarbons with coal pyrolysis. According to the method, hydrocarbon components taken as pyrolysis atmosphere are fed into a pyrolysis reactor through an inlet, activated by load-type metal catalysts and subjected to the aromatization, and then enter a coal pyrolysis layer for coupling pyrolysis with coal; and the reaction conditions are as follows: the temperature ranges from 300 DEG C to 1000 DEG C, the pressure ranges from 0.1 MPa to 3.0 MPa, the gas hourly space velocity ranges from 60 mL/g/h to 48000 mL/g/h, and the temperature is maintained constant for 0 minutes to 240 minutes. The method adopts hydrocarbons as the pyrolysis atmosphere instead of pure hydrogen gas for the pyrolysis, and increases the tar yield by coupling aromatization of hydrocarbons with coal pyrolysis. In the process, the cost of hydropyrolysis is reduced while the yield of tar is higher than the yield of tar produced by hydropyrolysis under the same conditions. Besides, the catalysts are not mixed with coal, and thus the catalysts are easy to be recycled and used repeatedly.

Description

technical field [0001] The invention belongs to the field of energy technology. Specifically, it relates to a method for increasing tar yield by coupling hydrocarbon aromatization and coal pyrolysis. Background technique [0002] Coal dominates China's energy structure. Coal accounts for about 70% of primary energy production and consumption. At present, the utilization of coal in my country is mainly coking and power generation. Due to technical reasons and other reasons, the energy utilization rate is low, and the environmental pollution is serious. Therefore, clean coal conversion technology is imperative. Advanced coal conversion technologies mainly include coal pyrolysis technology, gasification technology, liquefaction technology, and polygeneration technology coupled by these technologies. Among them, the pyrolysis of coal has attracted the attention of more and more researchers because of its diversity of products and mild reaction conditions. The liquid product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00C10G1/06
Inventor 胡浩权周逊靳立军
Owner DALIAN UNIV OF TECH
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