The method of producing ammonia

 

(57) Abstract:

The method of producing ammonia from hydrocarbons, water vapor, air, includes compression and purification of raw materials from sulfur compounds, steam and air-steam catalytic conversion of methane, the conversion of carbon monoxide, treatment received nitric mixture from oxygen-containing compounds, compression, synthesis of ammonia in a closed loop, the use of untreated from the sulphur content of the feedstock as fuel, waste heat of the flue gases and the allocation of flue gases into the environment, in this part of raw last clearing of sulfur compounds, drossellied to atmospheric pressure, burn when mixed with air, and the resulting flue gases after disposing of their heat komprimiert and sent to a steam-catalytic conversion of methane, the value of raw materials, past clearing of sulfur compounds and directed to the combustion air of 0.001-0,048 the number of hydrocarbons, and the ratio between the amount of flue gases directed to the conversion of methane and the quantity of air supplied to the vapor catalytic conversion of methane, as well 0,0146-1,685. The technical result consists in reducing the inheritance>/P>The invention relates to the production of ammonia and can be used in the chemical industry.

A method of obtaining ammonia from hydrocarbons, water vapor, air, oxygen, including the removal of sulfur compounds, processoriomodule catalytic conversion of methane in the mine Converter, the conversion of carbon monoxide, treatment received nitric mixture from oxygen-containing compounds, compression, synthesis in a closed loop [1].

The method requires to expend technical oxygen for carrying out the conversion of methane.

The closest in technical essence and the achieved result to the described invention is a method of obtaining amika of hydrocarbons, water vapor, air, including compression and purification of raw materials from sulfur compounds, steam and air-steam catalytic conversion of methane, the conversion of carbon monoxide, treatment received nitric mixture from oxygen-containing compounds, compression, synthesis of ammonia in a closed loop, the use of untreated from the sulphur content of the feedstock as fuel, waste heat resulting from the combustion of fuel, the separation of hydrocarbons due to the feed vapor conversion of methane by oxygen amount greater than required. Oxygen binds with hydrogen and is then output from the system in the form of water. Less feeding oxygen because the quantity supplied to providesnew the conversion of methane to oxygen of the air depends on the stoichiometric ratio between the main components of the gas mixture, which should be (hydrogen+carbon monoxide/ nitrogen=3,0-3.04 from.

The objective of the invention is the reduction of specific consumption of hydrocarbons and the reduction in the number of emitted flue gases in the atmosphere.

This object is achieved in that in the method of producing ammonia from hydrocarbons, water vapor, air, including compression and purification of raw materials from sulfur compounds, steam and air-steam catalytic conversion of methane, the conversion of carbon monoxide, treatment received nitric mixture from oxygen-containing compounds, compression, synthesis of ammonia in a closed loop, the use of untreated from the sulphur content of the feedstock as fuel, waste heat of flue gases, separation of flue gases into the environment, according to the invention the part of raw last clearing of sulfur compounds, drossellied to atmospheric pressure, burn in the mixture is analiticheskoy methane conversion.

The value of raw materials, past clearing of sulfur compounds and directed to the combustion air of 0.001-0,048 the number of hydrocarbons. The amount of flue gases directed to the conversion of methane, as well 0,0146-1,685 from the amount of air directed to the vapor catalytic conversion of methane.

The invention is illustrated by the following examples.

Example 1

Power unit ammonia 57,95 t/h. Ammonia is produced from hydrocarbons, water vapor and air, which komprimiert to the pressure of 43.3 kg/cm2,purify raw materials from sulfur compounds, conduct steam and air-steam catalytic conversion of methane, the conversion of carbon monoxide, treatment received nitric mixture from oxygen-containing compounds, komprimiert to a pressure of 335 kg/cm2,spend the synthesis of ammonia in a closed loop, using crude from sulfur raw materials as fuel, disposed heat of flue gases and emit flue gases into the environment. Part of raw last clearing of sulfur compounds in the number 59,764 nm3/h (0,001 on the quantity of hydrocarbons), drossellied to atmospheric pressure, is burned in a mixture with air is by using a heater natural gas prior to desulfurization. The heater is burned 1149,42 nm3/h of natural gas and is obtained 14000 nm3/h of flue gases with a temperature of 200oC. flue gases Obtained in the amount of 727,7 nm3/h (0,0146 from the amount of air directed to the vapor catalytic conversion of methane) after disposing of their heat komprimiert to the pressure of 34.5 kg/cm2and sent to a steam-catalytic conversion of methane. As a result of use of the invention in comparison with the prototype, the number of gas emissions into the atmosphere is reduced by 0.18%, and the specific consumption of hydrocarbons is reduced by 0,119%(determined using equation katipamula transition [3].

Example 2

The original data in example 2 same as example 1, except that the amount of added flue gas is 34808,31 nm3/h (1,685, compared to the amount of air directed to the vapor catalytic conversion of methane. With the high number of flue gas heat resulting from the exothermic reactions is equal to the amount of heat consumed by the endothermic reactions during the steam-methane conversion and the increase of the flue gas above oksanakozureva to atmospheric pressure for combustion when mixed with air, will be equal 2857, 825 nm3/h (0,048 the number of hydrocarbons).

To carry out combustion with air of hydrocarbons, last clearing of sulfur compounds using a tubular furnace. In a tubular furnace burned 24126 nm3/h of natural gas and it turns out 350000 nm3/h of flue gases with a temperature of 160oC. Specific consumption of hydrocarbons will decrease by 5.7%.

Outside the designated boundaries of 0.001-0,048 and 0,0146-1,685 to achieve tangible economic effect cannot. At values less than 0.001 and 0,0146 effect is small, due to values approaching zero, but values higher than 0,048 and 1,685 it will be impossible to vapor catalytic conversion of methane, so as not to be missed heat conducting endothermic reactions.

Thus, specified in the invention of distinctive features can achieve a reduction of consumption of hydrocarbons and reduce emissions through the use of flue gas as feedstock and recycle flue gas heat.

Sources of information

1. Directory of apothica. So 1, M,1967, S. 95-98, S. 211-366.

2. Directory of apothica. M.: Chemistry, 1986, S. 360-364, 83-85, 213-222.

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The method of producing ammonia from hydrocarbons, water vapor, air, including compression and purification of raw materials from sulfur compounds, steam and air-steam catalytic conversion of methane, the conversion of carbon monoxide, treatment received nitric mixture from oxygen-containing compounds, compression, synthesis of ammonia in a closed loop, the use of untreated from the sulphur content of the feedstock as fuel, waste heat of the flue gases and the allocation of the flue gases in the environment, characterized in that the part of the raw material of 0.001-0,048 the number of hydrocarbons, last clearing of sulfur compounds, drossellied to atmospheric pressure, burn when mixed with air, and the resulting flue gases, in the amount of 0,0146-1,685 from the amount of air directed to the vapor catalytic conversion of methane, after disposing of their heat komprimiert and sent to a steam-catalytic conversion of methane.

 

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