Production process for preparing liquid ammonia from coke-oven gas

Abstract

The invention provides a production process for preparing liquid ammonia from coke-oven gas, which comprises the following steps: feeding the coke-oven gas under a pressure grade for organic matter adsorption, feeding the coke-oven gas subjected to adsorption treatment into a low-pressure machine for pressurizing to a set pressure, sequentially carrying out desulfurization and decarbonization purification treatment, carrying out primary methanation on the purified gas, and carrying out secondary methanation on the purified gas, the methanation reaction of carbon monoxide is completed, a part of gas subjected to primary methanation is extracted and sent to secondary methanation, the gas subjected to secondary methanation is cooled and separated and then enters a cold box, and liquid methane is separated out. According to the whole production process, the coke-oven gas conversion procedure is omitted, the first-stage methanation aims at oxycarbide methanation, the second-stage methanation aims at the content of outlet oxycarbide, and the energy consumption is reduced and the LNG yield is greatly increased by utilizing the cascade arrangement of the first-stage methanation and the second-stage methanation.

Description

technical field

[0001] The invention relates to the technical field of chemical industry, in particular to a production process for preparing liquid ammonia from coke oven gas. Background technique

[0002] New energy, as the inevitable development of future energy, has become the focus of global attention. In addition to the traditional wind, light, and water, in recent years, hydrogen has been favored by the world as a completely pollution-free new energy after combustion, but pure hydrogen Production costs, storage methods, and transportation requirements are high and there are technical difficulties. There is still a time test for industrialization, although hydrogen energy vehicles have been used to a certain extent.

[0003] In recent years, liquid ammonia, as a hydrogen-rich substance, has been gradually recognized as having the same clean characteristics as hydrogen utilization, and has very mature technology and experience in production, storage, and transportation,...

Examples

Embodiment Construction

[0036] The application proposes a production process for preparing liquid ammonia from coke oven gas, comprising the following steps:

[0037] S1. Send the coke oven gas to the pressure level for organic matter adsorption;

[0038] S2. The coke oven gas after adsorption treatment is sent to the low-pressure machine to be pressurized to the set pressure, followed by desulfurization and decarburization purification treatment in sequence;

[0039] S3. The purified gas enters primary methanation to complete the methanation reaction of carbon monoxide;

[0040] S4. Extract part of the gas after primary methanation and send it to secondary methanation;

[0041] S5. The gas that has undergone secondary methanation is cooled and separated and then enters the cold box to separate liquid methane;

[0042] S6. After the gas cooling and separation of the secondary methanation, the remaining gas and the newly added ammonia gas are sent to the high-pressure compressor for compression trea...

technical field

[0001] The invention relates to the technical field of chemical industry, in particular to a production process for preparing liquid ammonia from coke oven gas. Background technique

[0002] New energy, as the inevitable development of future energy, has become the focus of global attention. In addition to the traditional wind, light, and water, in recent years, hydrogen has been favored by the world as a completely pollution-free new energy after combustion, but pure hydrogen Production costs, storage methods, and transportation requirements are high and there are technical difficulties. There is still a time test for industrialization, although hydrogen energy vehicles have been used to a certain extent.

[0003] In recent years, liquid ammonia, as a hydrogen-rich substance, has been gradually recognized as having the same clean characteristics as hydrogen utilization, and has very mature technology and experience in production, storage, and transportation,...

Examples

Embodiment Construction

[0036] The application proposes a production process for preparing liquid ammonia from coke oven gas, comprising the following steps:

[0037] S1. Send the coke oven gas to the pressure level for organic matter adsorption;

[0038] S2. The coke oven gas after adsorption treatment is sent to the low-pressure machine to be pressurized to the set pressure, followed by desulfurization and decarburization purification treatment in sequence;

[0039] S3. The purified gas enters primary methanation to complete the methanation reaction of carbon monoxide;

[0040] S4. Extract part of the gas after primary methanation and send it to secondary methanation;

[0041] S5. The gas that has undergone secondary methanation is cooled and separated and then enters the cold box to separate liquid methane;

[0042] S6. After the gas cooling and separation of the secondary methanation, the remaining gas and the newly added ammonia gas are sent to the high-pressure compressor for compression trea...

Images