Natural gas type synthesis ammonia energy-saving and emission-reduction technology

A technology of energy saving and emission reduction, process technology, applied in the field of process industry, to achieve the effect of reducing energy consumption and emissions, reducing emissions and energy consumption, good controllability and stability

Inactive Publication Date: 2010-02-10
董宏光 +1
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Problems solved by technology

[0005] Chinese patent CN01134103.3 "Compound amine solvent for recovering low partial pressure carbon dioxide" proposes to use amine solution to directly recover low partial pressure carbon dioxide and apply it to flue gas recovery in Chitianhua,

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  • Natural gas type synthesis ammonia energy-saving and emission-reduction technology
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  • Natural gas type synthesis ammonia energy-saving and emission-reduction technology

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0027] Referring to the Kellogg-type ammonia plant with a production capacity of 62.5t / h, the product unit consumption of this scheme is reduced by 2.5GJ / t compared with the original level. Recover 34t / h of carbon dioxide and 1t / h of argon. It is suitable for energy-saving and emission-reduction technological transformation of the existing natural gas ammonia synthesis device.

[0028] 1. The carbon dioxide recovery part of the flue gas is detailed as follows:

[0029] The pressurized flue gas with a flow rate of 380t / h is dried and pretreated, and most of the water is removed before entering the membrane separator. Since carbon dioxide passes through the membrane more easily, about 80% of the carbon dioxide enters the permeate gas, and at the same time the carbon dioxide in the permeate gas The concentration has reached ...

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Abstract

The invention discloses a natural gas type synthesis ammonia energy-saving and emission-reduction technology, which is characterized in that: a methodology of process systems engineering is adopted torealize mass-energy comprehensive integration, particularly comprising the following steps: carbon dioxide in one section of furnace flue gas is recovered by adopting a combined method of membrane separation and chemical adsorption; deeply cooling, distilling and recovering argon gas in purge gas of a hydrogen recovery device; a great quantity of low-temperature waste heat at the outlet positionof the top of a regenerating tower and an ice engine is recycled by adopting heat pump technology, so as to save cold of the ice engine and pre-heating boiler water; a similar device is used as a reference, the proposal is close to zero discharge, greenhouse gas emission load can be reduced by 50 percent to 100 percent, and carbon dioxide and argon gas are by-products at the same time, and the unit consumption of a product can reach 31GJ/tNH3, and compared with the original process, the energy saving can reach 5 percent to 15 percent. The technology is particularly suitable for the existing synthesis ammonia device which takes natural gas as raw material, so as to carry out energy-saving and emission-reduction technology reconstruction, the energy consumption of the natural gas type synthesis ammonia device based on the design of the proposal is the lowest level in the national similar devices.

Description

technical field [0001] The invention belongs to the technical field of petrochemical, chemical fertilizer and other process industries, and in particular relates to an energy-saving and emission-reducing process technology of a natural gas-type ammonia synthesis device. Background technique [0002] Ammonia is one of the important chemical products and occupies an important position in the national economy. Most nitrogen fertilizers used in agriculture are produced from ammonia. The world's annual synthetic ammonia output has reached more than 100 million tons, of which about 80% ammonia is used to produce chemical fertilizers, and 20% is used as raw materials for other chemical products. Synthetic raw materials mainly include natural gas, light oil, heavy oil and coal. Based on the consideration of plant economy, coal and natural gas are used as the main raw materials of ammonia synthesis plants in my country. At present, there are about 22 sets of large-scale natural ga...

Claims

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Application Information

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IPC IPC(8): C01C1/04C01B31/20C01B23/00
CPCY02P20/10Y02P20/129
Inventor 董宏光钱冬肖武
Owner 董宏光
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