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 830
With, 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 32000
0,804(1000-751)=6430000 kcal/h:- no additional heating of the same pair in the secondary reforming 830With up to 990That is 2000000 kcal/hEliminates heating of the nitrogen in the 2-stage methane conversion.(980-300)12000,3=245000 kcal/hTotal savings will be 19300000+6430000+2000000+245000=279750000 kcal/h or in terms of natural gas: 2797500008000=3500 Art. nm3/PMThe 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/PMThe total amount of added nitrogen after the stage of purification of gas from carbon dioxide is 1200 nm3/PMAt 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.
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
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 the mean-pressure steam used for the process of steam reforming and/or for the compressor drives is subjected to humidification by injection of the process condensate or feed water, and the obtained humidified steam is overheated by the heat of the flue gas in a unit of the heat-using equipment of the reforming tube furnace.
EFFECT: reduced consumption of energy due to reduction of the amount of generated steam and reduced of the amount of generated steam and reduced consumption of feed water; provided additional cleaning of the process condensate and recovering of gases dissolved in it in the process of steam humidification in the mass transfer device.
2 cl, 1 dwg
FIELD: power engineering.
SUBSTANCE: proposed steam-turbine plant for geothermal power station includes primary circuit consisting of geothermal circulation system and secondary circuit consisting of steam-turbine plant cycle. To increase thermodynamic efficiency of utilization of geothermal waters, plant is furnished additionally with evaporator, heat exchanger, gas-expansion machine and circulating pump. Mass flow rate of working medium getting into primary interwell heat exchanger greatly exceeds flow rate of medium circulating in steam turbine plant circuit. Working medium heated to saturation temperature is divided on surface into two flows. First flow gets into evaporator and further on into turbine and condenser, second flow is directed into heat exchanger whereto cooling water is directed from condenser for heating. Said water, after heating, is fed to low-potential heat consumers.
EFFECT: increased efficiency of power cycle at maximum decrease of temperature of waste thermal water.
1 dwg
FIELD: heat power engineering.
SUBSTANCE: invention relates to stationary thermal power stations of large and medium rating. According to invention, energy of combusted fuel is used three times, namely to create reactive thrust, to operate in gas turbine and to generate steam for steam turbine and which provide high efficiency of power station summing up efficiencies of reactive engine, gas and steam turbines. Depending on required power, from one to three similar-type electric generators can be connected in reactive-gas turbine cycle. Power rating of electric generator for steam cycle is chosen depending on heat generated at reactive-gas turbine cycle. Linear dimensions of power plant converting heat energy of fuel into mechanical energy are scaled depending on power output of designed power station.
EFFECT: simplified design and technology of manufacture, repair and servicing of power station.
4 dwg
FIELD: power engineering.
SUBSTANCE: proposed gas-steam thermoelectric plant contains gas-steam turbine unit with high-pressure gas turbine, counterpressure steam turbine, power-generating and ecological steam lines, steam-gas mixture heat recovery unit with steam recovery boiler, gas-water heater, gas cooler-condenser, separated water heat recovery unit. Low-pressure steam-gas turbine and afterburner chamber are arranged additionally in gas-steam turbine unit, afterburner chamber being installed between high-pressure gas turbine and low-pressure steam-gas turbine. Output of counterpressure steam turbine is connected by ecological steam line with output of high-pressure gas turbine and with after-burner chamber.
EFFECT: provision of designing of gas-steam thermoelectric plant of higher power output and economy using existing counterpressure steam turbines with standard initial parameters of steam.
2 dwg
FIELD: power engineering; ship engines.
SUBSTANCE: according to proposed method atmospheric air is compressed, contactly cooled and regeneratively heated by heat of waste steam-gas mixture, and fuel is combusted in said air with supply of power-generating steam flow into fuel combustion zone. Steam-gas mixture, thus formed, is expanded and useful work of expansion is used for compressing air and executing external work, generating electric energy for driving different mechanisms, for instance, vehicles. heat of steam-gas mixture, after expansion and regenerative removal of heat, is recovered for generation of steam, steam-gas mixture is cooled, its steam component is condensed and condensate, thus formed, is cooled and used for cooling and condensing of steam-gas mixture. Cooling of compressed moistened air is carried out at its contact with water in saturated state, or with saturated water vapor formed at recovery of heat of waste steam-gas mixture, and overheated steam is used as power-generating steam flow and for cooling of steam-gas turbine.
EFFECT: increased thermal economy of gas-steam plant.
2 dwg
FIELD: power engineering.
SUBSTANCE: working medium in proposed steam-gas turbine plant is mixture of combustion products and steam formed in mixing chamber before steam-gas turbine. Combustion products are formed in combustion chamber located after compressor, and steam is formed in heat exchanger-evaporator located after steam-gas turbine. Flow rate of steam is not less than 15% of flow rate of gas. Thermal efficiency of steam-gas turbine plant does not exceed 60%.
EFFECT: possibility of creating aircraft engine on base of steam-gas turbine plant 3-4 times exceeding shaft-turbine engines and turboprop engines by specific power and 2-3 times, by economy.
3 cl, 6 dwg
FIELD: power engineering.
SUBSTANCE: according to proposed method of operation of gas-steam thermoelectric plant, atmospheric air is compressed in compressor and fuel is combustion in said air, useful work of high-pressure turbine is used for compressing the air, useful work of low-pressure turbine is used to drive electric generator and generate power. Heat of waste steam-gas mixture is recovered for generation of superheated steam. Superheated steam is expanded in counterpressure steam turbine whose useful work is used for generation of power, and "ecological" steam expanded in counterpressure steam turbine is fed to combustion products coming out of high-pressure gas turbine, and "power generating: steam is fed into fuel burning zone of additional combustion chamber.
EFFECT: increased power and improved economy of gas-steam thermoelectric plant, possibility of use of existing gas and steam turbines with standard parameters of steam for creating said thermoelectric plant.
2 dwg
FIELD: power engineering, gas industry, shipbuilding.
SUBSTANCE: proposed gas-steam plant contains gas-steam turbine unit with air cleaner-air cooler, air compressor, regenerator and steam-gas turbine, and steam-gas mixture heat recovery unit with evaporator and steam superheater. Gas-steam turbine unit is furnished additionally with mixing chamber arranged between air compressor and regenerator. Steam-gas mixture heat recovery unit is connected additionally by pipeline coupling evaporator with mixing chamber of gas-steam turbine unit and steam superheater with cooling system of steam-gas turbine of gas-steam turbine unit.
EFFECT: increased specific power and efficiency of plant.
2 dwg
FIELD: power engineering.
SUBSTANCE: invention relates to methods of modernization of existing steam turbine thermoelectric plants. Proposed method of operation of steam-turbine thermoelectric plant with-turbine set with stepped expansion of combustion products and intermediate supply of heat of fuel comes to the following: heat of combustion products expanded in gas-turbine unit is recovered, high-pressure steam is generated and expanded in steam turbines of thermoelectric plants. To generate high pressure steam, feed water is used deaerated in thermoelectric plant. Said feed water is deaerated additionally by vacuum method. Steam condensate of steam turbines of thermoelectric plant is divided into two flows, one of which is directed for vacuum deaeration and the other is heated in low-pressure heaters of steam turbines, is deaerated at elevated pressure and is used as heating agent for vacuum deaeration of feed water.
EFFECT: increased power output and economy of thermoelectric plant at moderate capital outlays.
2 dwg
