Methanation system and method for preparing natural gas from coke-oven gas

Abstract

The invention provides a methanation system and method for preparing natural gas from coke-oven gas. The system comprises a homogeneous methanation reactor with a quench gas distributor and a heat insulation methanation reactor; tower entering gas consists of three parts including purified coke oven gas, supplementing CO2 and medium pressure steam; the other path of purified coke oven gas is usedas quench gas, and enters an array pipe of the homogeneous methanation reactor from the quench gas distributor to take methanation reaction; the self low temperature can be used for inhibiting the hotpoint temperature fly temperature of the reactor bed layer, wherein two kinds of different methanation catalysts are respectively filled in the array pipes of the homogeneous methanation reactor; other space in the array pipe is filled by heat conduction porcelain balls; heat released by methanation reaction is fast moved away through circulation water in a reactor shell pass; meanwhile, a heat insulation methanation reactor is connected in series behind the homogeneous methanation reactor for supplementary methanation reaction so as to improve the methanation depth; qualified natural gas products are produced. The coke oven gas methanation reaction process has the advantages that the operation temperature is constant; the methanation catalyst is well protected; the catalysis efficiency is high; the energy is saved; the operation is easy.

Description

technical field

[0001] The invention belongs to the technical field of synthetic natural gas, in particular to a methanation system and method for producing natural gas from coke oven gas. Background technique

[0002] The core technology of synthetic natural gas is methanation catalyst and methanation process technology. Among them, the development of methanation catalyst is relatively mature, and there are countless research institutes in China that master the production process of methanation catalyst. The natural gas chemical plants all adopt foreign technology and technology, and the domestic technology has not yet realized industrial application due to immaturity; the key to the methanation technology is to solve the problems of large heat release and difficult heat extraction during the reaction process, and maintain the reactor The key to natural gas synthesis technology is to keep the bed temperature constant and prevent catalyst deactivation and sintering under hig...

Examples

Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] A methanation method of coke oven gas to natural gas, the flow rate of coke oven gas from the system is 4000Nm 3 / h, pressure 9.0MPa, supplemented with CO 2 Airflow 1000Nm 3 / h, add water vapor 500Nm 3 / h, the three-way gas is passed into the gas mixing tank V101 and mixed evenly to form a raw material gas of 5500Nm into the tower 3 / h, the temperature reaches 220°C after heat exchange through the first tube heat exchanger E101, and then heated to 305°C by the first electric heater E201, and then passed into the upper part of the uniform temperature methanation reactor R1, and the The methanation catalyst catalyzes the reaction;

[0030] The other path of the coke oven gas is used as the chilled gas at a temperature of 20°C, and the flow rate is adjusted to 4000Nm by the chilled gas flow regulating valve FIQ104 3 / h, from the ventilation hole on the cold ...

technical field

[0001] The invention belongs to the technical field of synthetic natural gas, in particular to a methanation system and method for producing natural gas from coke oven gas. Background technique

[0002] The core technology of synthetic natural gas is methanation catalyst and methanation process technology. Among them, the development of methanation catalyst is relatively mature, and there are countless research institutes in China that master the production process of methanation catalyst. The natural gas chemical plants all adopt foreign technology and technology, and the domestic technology has not yet realized industrial application due to immaturity; the key to the methanation technology is to solve the problems of large heat release and difficult heat extraction during the reaction process, and maintain the reactor The key to natural gas synthesis technology is to keep the bed temperature constant and prevent catalyst deactivation and sintering under hig...

Examples

Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] A methanation method of coke oven gas to natural gas, the flow rate of coke oven gas from the system is 4000Nm 3 / h, pressure 9.0MPa, supplemented with CO 2 Airflow 1000Nm 3 / h, add water vapor 500Nm 3 / h, the three-way gas is passed into the gas mixing tank V101 and mixed evenly to form a raw material gas of 5500Nm into the tower 3 / h, the temperature reaches 220°C after heat exchange through the first tube heat exchanger E101, and then heated to 305°C by the first electric heater E201, and then passed into the upper part of the uniform temperature methanation reactor R1, and the The methanation catalyst catalyzes the reaction;

[0030] The other path of the coke oven gas is used as the chilled gas at a temperature of 20°C, and the flow rate is adjusted to 4000Nm by the chilled gas flow regulating valve FIQ104 3 / h, from the ventilation hole on the cold ...

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