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Process for producing hydrogen by use of burning carbon black tail gas

A process and tail gas technology, which is applied in the process field of using carbon black tail gas to produce hydrogen, can solve problems such as environmental pollution, and achieve the effects of simple process flow, energy saving and stable operation.

Active Publication Date: 2014-01-22
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 for producing hydrogen by use of burning carbon black tail gas
  • Process for producing hydrogen by use of burning carbon black tail gas
  • Process for producing hydrogen by use of burning carbon black tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The carbon black tail gas from the carbon black plant at about 80°C (see Table 1 for the composition) enters the water-cooled shock tube after blowing to 50kpa, the circulating cooling water contacts the hot carbon black tail gas, the temperature drops to normal temperature, and enters the gas-water separator for separation The liquid water enters the desulfurization system for desulfurization, and the desulfurization method adopts the NHD (polyethylene glycol dimethyl ether) method.

[0040] The gas enters from the lower part of the absorption tower and passes through the absorption tower from bottom to top; the regenerated NHD solution (lean liquid) enters from the upper part of the absorption tower and passes through the absorption tower from top to bottom, and the counter-flowing NHD and mixed gas are fully absorbed in the absorption tower Contact, H in gas 2 S, SO 2 , SO 3 and CO 2 absorbed.

[0041] The absorbent that has absorbed the acid gas is called rich l...

Embodiment 2

[0051] The carbon black tail gas from the carbon black plant at about 140°C (see Table 1 for components) is pressurized by the blower at 50kpa, then enters the bag filter for dust removal, enters the shift reaction preheater and heats it to 200°C, then enters the shift reactor. Under this condition, CO in the gas undergoes a shift reaction with water vapor (see equation 1). At the beginning of the reaction, use the high-temperature gas from the carbon black plant or an electric heater to heat the raw material intake. After the reaction starts, use the high-temperature mixed gas from the shift reactor to preheat the raw material intake. The main component of the mixed gas from the shift preheater is CO , CO 2 、H 2 , N 2 And water vapor, the hot gas is used to heat the desulfurized and decarbonized rich liquid to further recover heat. The cooled mixed gas enters the cooler to cool to normal temperature, then enters the gas-water separator to separate liquid water, and then en...

Embodiment 3

[0061] The carbon black tail gas from the carbon black plant at about 120°C (see Table 5 for components) is pressurized by the blower to 70kpa, then 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 the catalyst, the CO in the gas and water vapor undergo a transformation reaction, and the transformed hot gas enters the transformation preheater to preheat the raw material mixture gas, and the main component of the mixture gas exiting the transformation reaction system is CO 2 、H 2 , N 2 And water vapor, the mixed gas enters the cooler to cool to normal temperature, then enters the gas-water separator to separate liquid water, and enters the desulfurization system. The desulfurization method adopts the PDS method, and the operation mode is the same as that of Example 1. After desulfurization, the total S content is lower than 1mg / m 3 , CO 2 Content below 100 mg / m 3 .

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Abstract

The invention discloses a process for producing hydrogen by use of burning carbon black tail gas. The process comprises the following steps of blasting the burning carbon black tail gas, cooling for dewatering, desulfurizing, drying, pressurizing, and carrying out pressure swing adsorption and separation to obtain the hydrogen. The process has the beneficial effects that (1) the process used for purifying the hydrogen from the burning carbon black tail gas in an industrial scale manner is firstly proposed, so that a great amount of the burning carbon black tail gas blown into atmosphere at present is produced into the hydrogen, and the device is stable to operate, has high reliability and high heat utilization ratio, and can achieve the effects of recycling the industrial effluent gas, saving energy, reducing emission and turning wastes into wealth; (2) high-temperature heat released in the production process of a carbon black plant is utilized, the used heat and the heat released are comprehensively considered, the whole process flow is designed reasonably, and the heat of all operating units can be utilized comprehensively, so that an external heat source is not required to be supplemented, and the energy can be saved; (3) hydrogen sulfide and water vapor in the burning carbon black tail gas originally are utilized for sulfur tolerant conversion directly, and the process flow is simple; (4) the hydrogen with high purity can be produced as a hydrogen source required by chemical engineering.

Description

technical field [0001] The invention relates to a hydrogen production process, in particular to a hydrogen production process 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 used in the automotive industry. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C01B3/16C01B3/50
CPCY02E60/32
Inventor 陈耀壮毛震波谭平华李洁蒋贵仲
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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