The distribution of the consumption of steam for steam turbines operating with backpressure, in the production of ammonia

 

The invention relates to the field of industrial power engineering and chemical industry and can be used for the production of ammonia from hydrocarbon gases. In the method of distribution of the consumption of steam for steam turbines operating with backpressure, in the production of ammonia from hydrocarbon gases, the total flow of steam medium-pressure steam turbine operating with backpressure G support level, the value of which is determined by the equation

G=Dor+G+G+G,

where Gop - flow low-pressure steam cleaning gas from CO2and justify the process condensate; G - flow low-pressure steam for deaeration of the feed water; G - flow low-pressure steam to water-ammonia refrigeration unit; Go - flow low-pressure steam heating apparatus, pipelines, and for other purposes. The invention allows to optimize the production and distribution of steam in the production of ammonia, to reduce the cost of generating high-pressure steam and to reduce the flow of feed water. 1 C.p f-crystals, 1 Il.

The invention relates to the field of industrial power engineering and chemical industry and can be used when p is ionirovanii combined cycle power plant (see EN 2050443 C1, class F 01 K 13/00, 20.12.1995) running on natural gas and includes a semi-enclosed gas and closed steam circuits, interconnected by means of a steam boiler.

The disadvantage of this method is of limited use.

There is a method of distribution of the consumption of steam for steam turbines operating with backpressure, in the production of ammonia from natural gas, including: the desulfurization of hydrocarbon gases, catalytic steam reforming in a tubular furnace at a pressure of 2.9 to 3.8 MPa, the compression ratio of the air-driven motor, a steam catalytic conversion in the shaft reactor, two-stage catalytic conversion of carbon monoxide, the use of heat converted gas mixture, the cleaning gas from the carbon dioxide, booster compression produced synthesis gas with electric drive, the synthesis of ammonia in the circulation circuit with a circulating blower and a system of generating superheated water vapor pressure of 3.8 to 4.2 MPa in waste heat boilers by using the heat of the technological processes of heat of flue gases of the reformer furnace in the unit combustion apparatus (BTA) tubular furnace with the waste fumes from the sa steam reforming and other production needs, another part of the steam issue. (See The project's ammonia production capacity of 600 tons/day, second of all, the object 19418-for Rivne REASON the Company p/I-7531, , Severodonetsk, 1968 S. 138 - schema steam and condensate).

The known method has the significant drawback: due to the fact that all the main compressor and the pumps are electric actuators, a significant portion of the obtained vapor pressure of 3.8 to 4.2 MPa cannot be used in the production of ammonia and thrown to the side, which increases the energy costs of the production of ammonia.

Of the known methods is the closest way to distribute the consumption of steam for steam turbines operating with backpressure, in the production of ammonia from hydrocarbon gases by desulfurization of hydrocarbon gases, catalytic steam reforming in a tubular furnace at a pressure of 2.9 to 3.8 MPa, compressed air, steam-air catalytic conversion in the shaft reactor, two-stage conversion of carbon monoxide, heat of the converted gas mixture, gas purification from carbon dioxide booster compression of the produced synthesis gas, ammonia synthesis on the circulation diagram with circulation by using the heat of the technological processes, heat the flue gases of the reformer furnace in the unit combustion apparatus (BTA) tubular furnace, in the auxiliary boiler, ensure the maintenance of the balance of steam, and starting the boiler, generating superheated steam medium pressure (3,8-4,2 MPa) and providing start-up and transient operation modes, using the generated water vapor high pressure of 9.7 to 10.6 MPa) in the first stage of the turbine compressor syngas working with backpressure and having output superheated steam medium pressure (3,8-4,2 MPa), part of which is used for the process of steam reforming, and the other part is used in the second stage of the turbine of the syngas compressor and turbines other compressors, exhausters, pumps condensing turbines and turbines with backpressure from the exhaust low pressure steam (0,4-0,8 MPa), with the issuance of the part of low-pressure steam on the side. (See Technical project ammonia production AM-70 capacity of 1360 tons/day for Kirovo-Chepetsk chemical works, project No. 25040, GIAP, Moscow, 1974, S. 111, 117, 118).

The described method has the disadvantage that part of the low pressure steam is not used in the production of ammonia, and is thrown to the side, which increases the stage because of its low settings. In addition, the issuance of a couple on the side, usually associated with not returning the condensate, which increases the cost of obtaining boiler feed water.

The technical result, which is aimed invention is to optimize the production and distribution of steam in the production of ammonia, reducing the cost of generating high-pressure steam and reducing the flow of feed water.

The technical result is achieved in that in the method of distribution of the consumption of steam for steam turbines operating with backpressure, in the production of ammonia from hydrocarbon gases by desulfurization of hydrocarbon gases, catalytic steam reforming in a tubular furnace at a pressure of 2.9 to 3.8 MPa, compressed air, steam-air catalytic conversion in the shaft reactor, two-stage conversion of carbon monoxide, heat of the converted gas mixture, gas purification from carbon dioxide consumption of low pressure steam, booster compression of the produced synthesis gas, the synthesis of ammonia in the circulation circuit with circulation pump and water-ammonia refrigeration unit, consuming low pressure steam, deaeration nutrients in waste heat boilers through the use of warmth technological processes, heat the flue gases of the reformer furnace in the unit combustion apparatus (BTA) tubular furnace, in the auxiliary boiler, ensure the maintenance of the balance of steam, and starting the boiler, generating superheated steam medium pressure (3,8-4,2 MPa) and providing start-up and transient operation modes, using the generated water vapor high pressure of 9.7 to 10.6 MPa) in the first stage of the turbine compressor syngas working with backpressure and having output superheated steam medium pressure (3,8-4,2 MPa), part of which is used for the process of steam reforming, and the other part is used in the second stage of the turbine of the syngas compressor and condensing turbines and turbines with backpressure from the exhaust low pressure steam (0,4-0,8 MPa), other compressors, exhausters and pumps, with the issuance of the part of low-pressure steam on the side, the total flow of steam medium-pressure steam turbine operating with backpressure G support level, the value of which is determined by the following equation:

G=Dor+G+G+G,

where Gop - flow low-pressure steam cleaning gas from CO2and justify the process condensate;

G - consumption patillo installation;

Go - flow low-pressure steam heating apparatus, pipelines, and for other purposes.

The technical result is also achieved by the fact that the change in the total flow of steam medium-pressure steam turbine operating with backpressure, performed by replacement of part of the turbine exhauster and pumps running with backpressure turbines, condensing turbines or electric actuators.

The drawing shows a schematic diagram of a device for implementing the method.

The device for implementing the method includes: the desulfurization of hydrocarbon gas 1, catalytic steam reforming in a tubular furnace 2 with the unit combustion apparatus 3 and the auxiliary boiler 4, provozglashennoy catalytic conversion of 5 with heat recovery boilers 6, two-stage conversion of carbon monoxide 7 using heat converted gas mixture 8, the cleaning gas from the carbon dioxide 9, booster compression of the synthesis gas 10, the ammonia synthesis 11 circulating blower 12 and water-ammonia refrigeration unit 13, the installation of the preparation of boiler feed water 14, the deaeration of boiler feed water 15, starting the boiler 16, the first stage of the turbine compressor synthesis-ha 18, condensing turbine air compressors and natural gas 19, 20, turbine exhausts and pumps 21, 22, employed with a pressure of 0.4-0.8 MPa, the installation of heating units and pipelines 23.

Hydrocarbon gas in line 24 under the pressure of 3.9 to 4.5 MPa in the desulfurization and passes sequentially through all stages of production. High-pressure steam (9.7 to 10.6 MPa) of the generation system steam line 25 is fed to the first stage of the turbine compressor synthesis gas, after which a portion of the steam medium pressure line 26 is fed to the second stage turbine syngas compressor, the other part of the steam medium pressure going into the reservoir 27, which is distributed: on line 28, the process of reforming, line 29 to a condensing turbine air compressor 19, line 30 for condensing turbine natural gas compressor 20, lines 31 and 32 in the turbine exhauster and pumps, working with a pressure of 0.4-0.8 MPa. Low pressure steam (0,4-0,8 MPa) is collected in the reservoir 33, from which it is distributed: at line 34 in water-ammonia refrigeration unit, on line 35 cleaning gas from carbon dioxide and justify the process condensate line 36 to the deaeration nutrient womem invention presents a method of ammonia production with a capacity of 1,360 tons/day of natural gas from the steam reformer at a pressure of 3.6 MPa and system of generating superheated steam of high pressure to 10 MPa, temperature 482C in the amount of 310 t/h After the first stage of the turbine compressor syngas steam medium pressure (4 MPa) is distributed as follows: 60 t/h in the second condensation stage turbine syngas compressor, 125 t/h on the process of reforming, 60 t/h condensing turbine air compressor, 15 t/h in the condensation stage compressor natural gas, 20 t/h turbine exhauster working with backpressure and 30 t/h turbine pump feed water working pressure. Low pressure steam (0,4-0,8 MPa) 50 t/h after turbines operating with backpressure is used for: gas purification from carbon dioxide 15 t/h, acceleration of the process condensate 11 t/h, water-ammonia refrigeration unit 5 t/h, deaeration of the feed water 9 t/h, heating devices, pipelines and other purposes 10 t/h When this condition is met the most rational level of the total consumption of steam (medium pressure turbines operating with a pressure of 0.4-0.8 MPa.

For comparison, in the prototype, with the total flow of steam (medium pressure turbines operating with a pressure of 0.4-0.8 MPa 75 t/h, with the same consumers of low-pressure steam of abbritti saving high-pressure steam in the amount of 20 t/h or equivalent in terms of 1700 m3/h of natural gas. In addition, the reduction in the issuance of low-pressure steam to the side reduces the amount of feed water.

Claims

1. The distribution of the consumption of steam for steam turbines operating with backpressure, in the production of ammonia from hydrocarbon gases by desulfurization of hydrocarbon gases, catalytic steam reforming in a tubular furnace at a pressure of 2.9 to 3.8 MPa, compressed air, steam-air catalytic conversion in the shaft reactor, two-stage conversion of carbon monoxide, heat of the converted gas mixture, gas purification from carbon dioxide consumption of low pressure steam, booster compression of the produced synthesis gas, the synthesis of ammonia in the circulation circuit with circulation pump and water-ammonia refrigeration plant, consuming low pressure steam, the deaeration of the feed water, with the consumption of low pressure steam, generating superheated vapour high pressure of 9.7 to 10.6 MPa) in waste heat boilers by using the heat of the technological processes of heat of flue gases of the reformer furnace to the combustion unit so the PTO boiler, generating superheated steam medium pressure (3,8-4,2 MPa) and providing start-up and transient operation modes, using the generated water vapor high pressure of 9.7 to 10.6 MPa) in the first stage of the turbine compressor syngas working with backpressure and having output superheated steam medium pressure (3,8-4,2 MPa), part of which is used for the process of steam reforming, the other part of the steam medium pressure is used in the second stage of the turbine of the syngas compressor and turbines other compressors, exhausters, pumps condensing turbines and turbines, working with backpressure from the exhaust low pressure steam (0,4-0,8 MPa), with the issuance of the part of low-pressure steam on the side, characterized in that the total flow of steam medium-pressure steam turbine operating with backpressure G support level, the value of which is determined by the equation

G=Dor+G+G+G,

where Gop - flow low-pressure steam cleaning gas from CO2and justify the process condensate;

G - flow low-pressure steam for deaeration of the feed water;

G - flow low-pressure steam to water-ammonia refrigeration system;

Go - steam flow in a steam turbine, working with backpressure under item 1, characterized in that the change in the total flow of steam medium-pressure steam turbine operating with backpressure performed by replacement of part of the turbine exhauster and pumps running with backpressure turbines, condensing turbines or electric actuators.

 

Same patents:

The invention relates to the field of power engineering and can be used in thermal power plants

Electric generator // 2230197
The invention relates to the field of electrical engineering, namely the electrical industry, and can be used for thermal power stations, steam generators and on ships

Thermal power plant // 2227829
The invention relates to the field of power engineering and can be used in thermal power plants

The invention relates to the field of power engineering and can be used in thermal power plants

The invention relates to ecological systems, and specifically to devices for obtaining and using electrical energy from natural renewable sources of energy on the sea without pollution

The invention relates to the field of power engineering and can be used in boiler plants

The invention relates to the field of power engineering and can be used in boiler plants

The invention relates to the field of power engineering and can be used in thermal power plants

The invention relates to the field of power engineering and can be used in thermal power plants

The invention relates to the field of power engineering and can be used in thermal power plants
The invention relates to the production of ammonia
The invention relates to the production of ammonia and can be used in the chemical industry

The invention relates to the technology of complex processing of hydrocarbon fuel gases, such as methane and other natural gases, to obtain a synthesized substances

The invention relates to the production of ammonia by the catalytic conversion of ammonia synthesis gas

The invention relates to a catalyst for the synthesis of ammonia from hydrogen and nitrogen

The invention relates to a method for joint production of ammonia and urea on the plant includes a reactor for the synthesis of ammonia synthesis reactor urea and the regeneration section of the urea
The invention relates to processes of chemical technology, and in particular to methods of production of ammonia

FIELD: heat power and chemical industries, applicable in production of ammonia.

SUBSTANCE: in the method for steam generation at production of ammonia from hydrocarbon gases, saturation of the hydrocarbon gas after desulfurization and/or process air fed to the secondary reforming is effected due to the use of the flue gas of a tube furnace at a temperature of 160 to 580C, preferably within 220 to 480C, by means of water recirculation.

EFFECT: reduced consumption of energy due to reduction of the total amount of generated steam, reduced consumption of feed water, and recovered gases dissolved in the process condensate.

4 cl, 1 dwg

Up!