The method of supplying natural gas to energy technology installation of ammonia production

 

The invention relates to the field of industrial power engineering and chemical technology and can be used in producing synthetic ammonia. In the method of supplying natural gas to the power and process plant for production of ammonia by natural gas and steam in a tubular furnace first-stage steam reforming in a certain ratio and maintaining the temperature of the output gas mixture of about 830With, the supply of air to the second stage of the conversion of methane in the mine the reactor to achieve a ratio of hydrogen to nitrogen of 3:1 and maintaining the temperature of the output converted gas 980-990With, cleaning the converted gas from the carbon dioxide compression mixture of nitric and synthesis of ammonia, the ratio of the vapor-carbon set to 2.8:1, reduce the amount of air to the second stage, and the necessary amount of nitrogen added after the stage of purification of gas from carbon dioxide. The invention allows to reduce the consumption of thermal energy and to reduce the capital cost of the equipment.1 Il.

The invention relates to the field of industrial power engineering and chemical technology and can be ispolbzuet cost a large amount of energy and material resources, therefore, the most important is the development of technological schemes of production based on the energy technology combine to enhance the efficiency of its production.

There is a method of natural gas in energy technology installation by heating in the heat exchanger-regenerator, mixing with the combustion products containing carbon dioxide and superheated steam conversion in a thermochemical reactor and generation of electricity and heat (see EN 2050443 C1, class F 01 To 21/04, 20.12.1995).

There is a method of natural gas in energy technology installation by using the products of the endothermic reaction of fuel and air that is heated in the heat exchanger-regenerator, mixing with the combustion products of the first turbine with superheated steam, electricity generation in the second turbine and heat (see EN 2085754 C1, class F 01 To 21/04, 27.07.1997).

The disadvantages of the known methods is limited use.

Known methods closest to the proposed invention is a method of supplying natural gas to the power and process plant for ammonia production, including the supply of natural gas and steam in a tubular furnace first stage steam RIA on the second step of the conversion of methane in the shaft reactor and maintaining the temperature of the output converted gas 980-990(Handbook of apothica. Moscow "Chemistry", 1986, pp. 83-85, Fig.11-14).

The disadvantage of this method is wasteful expenditure of energy on heating of excessive amounts of steam, and also for pumping a large volume of gas through pipelines because of the high resistance of the piping system.

The technical result, which directed the present invention is to reduce power consumption and reduce capital costs.

This technical result is achieved in that in the method of supplying natural gas to the power and process plant for production of ammonia by natural gas and steam in a tubular furnace first-stage steam reforming in a certain ratio and maintaining the temperature of the output gas mixture of about 830With, the supply of air to the second stage of the conversion of methane in the mine the reactor to achieve a ratio of hydrogen to nitrogen of 3:1 and maintaining the temperature of the output converted gas 980-990With, cleaning the converted gas from the carbon dioxide compression mixture of nitric and synthesis of ammonia, the ratio of the vapor-carbon set to 2.8:1, reduce the amount of air vedii gas purification from carbon dioxide.

The drawing shows a schematic diagram of the power and process installation for implementing the method.

The power and process plant comprises a tubular furnace 1 first-stage steam reforming, coal reactor 2 the second stage of the conversion of methane, stage of purification from carbon dioxide 3, compression nitric mixture of 4 and ammonia synthesis 5.

The method of supplying natural gas to the power and process plant for production of ammonia is carried out as follows.

Natural gas after desulfurization (not shown) is supplied into the tubular furnace 1 first-stage steam reforming, which also receives the water vapor that is mixed in the ratio of 2.8:1. In a tubular furnace fed fuel gas outlet temperature is maintained at the vapor-gas mixture of about 830C. the second step conversion of methane in the mine reactor 2 is fed air to achieve a ratio of hydrogen to nitrogen of 3:1 and maintaining the temperature of the output converted gas 980-990C. the Amount of air to the second stage reduce to 1500 nm3/'clock Converted gas is purified from carbon dioxide 3, after which the gas add the missing amount of nitrogen in costuume ammonia production from natural gas with a capacity of 1360 tons/day or more with tubular furnaces first-stage steam reforming and shaft reactor in the second stage methane conversion is the ratio of steam:carbon on the first stage of 3.6:1. The temperature of the output gas mixture support about 830C. the second step conversion of methane in the mine reactor serves the air to achieve a ratio of hydrogen to nitrogen of 3:1 and maintaining the temperature of the output converted gas 980-990C.

When the decrease in the ratio of steam:carbon on the first step from 3.6:1 to 2.8:1 reduces the load on the pair in the first stage (3,6 -2,8)40000=32000 nm3/h heat Saving will be 320000,804751=19300000 kcal/h;

- reduces the amount of heat for heating excluded pair in the first stage for 320000,804(1000-751)=6430000 kcal/h:

- no additional heating of the same pair in the secondary reforming 830With up to 990That is 2000000 kcal/h

Eliminates heating of the nitrogen in the 2-stage methane conversion.

(980-300)12000,3=245000 kcal/h

Total savings will be 19300000+6430000+2000000+245000=279750000 kcal/h or in terms of natural gas: 2797500008000=3500 Art. nm3/PM

The missing amount of nitrogen, with the contraction Elitny gas 250 Art. nm3/h), and reduced consumption of oxygen at 300 nm3/h In terms of air reducing its submission to the second stage will be 1500 nm3/PM

The total amount of added nitrogen after the stage of purification of gas from carbon dioxide is 1200 nm3/PM

At the same time decreasing the resistance of the gas in the furnace, in the secondary reformer, the pipeline stage of conversion of carbon monoxide and gas purification from carbon dioxide by reducing the volume of gas on the listed stages.

Claims

The method of supplying natural gas to the power and process plant for ammonia production, including the supply of natural gas and steam in a tubular furnace first-stage steam reforming in a certain ratio and maintaining the temperature of the output gas mixture of about 830With, the supply of air to the second stage of the conversion of methane in the mine the reactor to achieve a ratio of hydrogen to nitrogen of 3:1 and maintaining the temperature of the output converted gas 980-990With, cleaning the converted gas from the carbon dioxide compression mixture of nitric and synthesis of ammonia, characterized in that on the first the second step of maintaining the gas temperature at the exit is not above 980-990With, and the necessary amount of nitrogen added after the stage of purification of gas from carbon dioxide.

 

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