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Process of preparing synthetic natural gas by carbon black tail gas

A technology for synthesizing natural gas and tail gas, applied in the petroleum industry, gas fuel, fuel and other directions, can solve problems such as environmental pollution, and achieve the effects of high heat utilization rate, high reliability and simple process

Active Publication Date: 2014-01-08
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, carbon black enterprises have not processed carbon black tail gas, and its utilization is mainly to recover the high-temperature heat. A large amount of tail gas is directly discharged into the atmosphere, causing serious environmental pollution.

Method used

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  • Process of preparing synthetic natural gas by carbon black tail gas
  • Process of preparing synthetic natural gas by carbon black tail gas
  • Process of preparing synthetic natural gas by carbon black tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] According to the current production process of carbon black by the oil furnace method, after passing through the three-stage cyclone separator and the pulse bag filter, the temperature of the carbon black tail gas drops to 80-140°C, and this gas is the raw material gas of the present invention.

[0053] The carbon black tail gas from the carbon black plant at about 140°C (see Table 1 for the composition) is pressurized to 80kpa by the blower, and after dust removal by the bag filter, it enters the shift reaction preheater and is heated to 200°C, and the outlet temperature of the shift reaction gas is 250°C , the gas residence time is 50s. The shift reaction preheater uses the heat released by the shift reaction to heat the shift reaction intake air, and then enters the sulfur-tolerant shift reactor. Under the action of a common sulfur-tolerant shift catalyst, 42% of the CO and water in the gas The steam undergoes a sulfur-tolerant shift reaction (see equation 1). At the...

Embodiment 2

[0070] The carbon black tail gas from the carbon black factory at about 101°C (see Table 2 for the composition) is separated from gas and water, pressurized by a blower to 50kpa, and enters the ceramic filter. The filter time of the ceramic filter is 5 minutes, and the blowback is 1 minute. Blow alternately. After passing through the ceramic filter, the dust content of the gas is reduced to 5-10mg / Nm 3 .

[0071] The dedusted gas enters the shift reaction preheater and is heated to 250°C, and then enters the shift reactor. Under the action of the catalyst (QSC-3 sulfur-resistant shift catalyst commercially available from a domestic company), 52% of the CO and water vapor in the gas Sulfur tolerance shift reaction occurs (see reaction formula 1). The outlet temperature of the shift reaction gas is 320° C., the gas residence time is 30 s, and the start-up and heat utilization methods of the shift reaction are the same as those in Example 1. The cooled mixed gas enters the coo...

Embodiment 3

[0084] The carbon black tail gas from the carbon black plant at about 120°C (see Table 5) is pressurized by the blower to 70kpa, enters the bag filter for dust removal, enters the shift reaction preheater to be heated to 250°C, and then enters the shift reactor. Under the action of K8-11 conversion catalyst), 48% of CO in the gas undergoes a conversion reaction with water vapor (see reaction formula 1), the outlet temperature of the conversion reaction gas is 310°C, and the gas residence time is 40s. The heater preheats the raw material mixture, and the start-up and heat utilization methods of the shift reaction are the same as those in Example 1. The main components of the mixed gas exiting the shift reaction system are CO, CO 2 、H 2 , N 2 and water vapor, the mixed gas enters the cooler to be cooled to normal temperature and then enters the gas-water separator to separate the liquid water and then enters the chemical solvent alcoholamine absorption method desulfurization a...

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Abstract

The invention discloses a process of preparing synthetic natural gas by carbon black tail gas. After the carbon black tail gas is subjected to blowing, dust removal and CO conversion, CO and vapor in the carbon black tail gas are converted into H2 and CO2; the carbon black tail gas is then subjected to cooling dewatering, sulfur removal and pressurization, methanation is performed; methane concentration is performed to obtain the synthetic natural gas after cooling, dewatering and drying. The process has the advantages that the process of preparing the synthetic natural gas by industrial-scale carbon black tail gas is provided for the first time, and recovery of industrial emission, energy conservation, emission reduction and turning waste into wealth are achieved; the heat, vapor and sulfide in the carbon black tail gas are utilized, heating, vapor supplementing and cooling are not required, and the process is simple; a great amount of heat is released during conversion and methanation, heat of operating units is comprehensively utilized through reasonable design, external supply of heat is not required, and byproduct high-quality steam is also produced; high-purity methane products can be produced and are processed into CNG, LNG or urban gas and can also be processed into chemical materials.

Description

technical field [0001] The invention relates to a process for preparing synthetic natural gas, in particular to a process for preparing synthetic natural gas by using carbon black tail gas. Background technique [0002] Carbon black is an amorphous carbon formed by incomplete combustion or pyrolysis of gaseous or liquid hydrocarbons under the condition of insufficient air. It is a loose, light and extremely fine black powder substance with high dispersibility and insoluble In various solvents, the relative density is 1.8-2.1. Its composition is mainly elemental carbon, and contains a small amount of oxygen, hydrogen and sulfur, as well as other impurities and moisture, etc., and its microcrystals have a quasi-graphite structure. [0003] Carbon black is mainly used as a reinforcing agent and filler for rubber. Carbon black for rubber accounts for 90% of the total carbon black, of which about 70% is used in tire manufacturing, and about 80% of carbon black consumption is use...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 陈耀壮李洁赖崇伟蒋贵仲雷菊梅
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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