Method heat recovery with the production of synthesis gas for production of ammonia and methanol

 

The invention relates to the field of industrial power engineering and chemical technology and can be used to obtain the synthesis gas in the production of synthetic ammonia and methanol. In the way of regeneration heat for the production of synthesis gas for production of ammonia and methanol from natural gas or other hydrocarbon raw material containing impurities of sulfur compounds, carried out by chemosorption-catalytic desulfurization under high pressure and temperature with a heat source gas, steam reforming of hydrocarbons in a tubular furnace by combustion of fuel gas and heat recovery of flue gas in the combustion unit equipment, including heat exchange elements located in series along the flue gas zones to heat the gas mixture, the steam-air mixture and overheating of the water vapor pressure of 8.8-10.9 MPa to a temperature of 475-500C, as well as in the areas of feedwater heating and fuel gas heating, heat source gas for hemosorption-catalytic desulfurization carry out flue gas tube furnace in heat exchange elements placed in the unit combustion equipment in the area after the overheated water vapor. The image is>sabreena relates to the field of industrial power engineering and chemical technology and can be used to obtain the synthesis gas in the production of synthetic ammonia and methanol.

There is a method of treatment of natural and process gas for the production of synthesis gas for ammonia production by conducting hemosorption-catalytic desulfurization source of gas under high pressure and temperature (see Handbook for apothica. - M.: Chemistry, 1986, pages 208-215, Fig.111-1). Heat source gas entering the clearing, firing is carried out in the heater.

The disadvantage of this method is the necessity of using separate hardware in the form of fire heater and the low efficiency of its heat, which leads to an increase of total energy consumption.

Closest to the proposed invention is a method of heat recovery for the production of synthesis gas for production of ammonia and methanol from natural gas or other hydrocarbon raw material containing impurities of sulfur compounds (see Handbook for apothica. - M.: Chemistry, 1986, pages 112-121, 83-85), carried out by chemosorption-catalytic desulfurization under high pressure and temperature with heating of the outcome of the flue gas in the unit combustion equipment, includes heat exchange elements located in series along the flue gas zones to heat the gas mixture, steam-air mixtures and for overheated water vapor pressure of 8.8-10.9 MPa to a temperature of 475-500With, as well as in the areas of feedwater heating and preheating of the fuel gas.

The known method has the disadvantage that characterized the lack of use of the heat of the flue gases in the combustion unit of the equipment, caused by inefficient temperature heat source gas flue gas having a high temperature, and lack of heat environments in the unit combustion equipment tubular furnace, which increases the total heat loss from the exhaust flue gases and, as a consequence, the over-expenditure of fuel gas.

The technical result, which directed the present invention is to reduce the consumption of fuel gas through better use of heat of flue gases.

This technical result is achieved in that in the method of regeneration heat for the production of synthesis gas for production of ammonia and methanol from natural gas or other hydrocarbons, avicenum pressure and temperature with a heat source gas, steam reforming of hydrocarbons in a tubular furnace by combustion of fuel gas and heat recovery of flue gas in the combustion unit equipment, including heat exchange elements located in series along the flue gas zones to heat the gas mixture, the steam-air mixture and overheating of the water vapor pressure of 8.8-10.9 MPa to a temperature of 475-500With, as well as in the areas of feedwater heating and fuel gas heating, heat source gas for hemosorption-catalytic desulfurization carry out flue gas tube furnace in heat exchange elements placed in the unit combustion equipment in the area after the overheated water vapor.

This technical result is also achieved by the fact that the heat source gas for hemosorption-catalytic desulfurization is carried out in a heat exchange elements arranged in series along the source gas, first in the area near the exit flue gas, then in the area before the heat exchange elements to heat the feed water.

This technical result is also achieved by the fact that the overheat protection heat exchangers for heating the source gas services the Menno elements, then the supply of protective gas environment, which can be used, for example, nitrogen purge, fuel gas and other

The drawing shows a schematic diagram for implementing the method.

The scheme includes a step hemosorption catalytic desulfurization site heating the source gas in the heat exchange elements placed in the unit 1 combustion apparatus, apparatus for the catalytic hydrogenation of organic sulfur compounds 2 and chemisorption of hydrogen sulfide scavengers of 3. The scheme also includes steam reforming of hydrocarbons in a tubular furnace 4. 5, the exhaust pipe 6 and a steam-methane conversion 7.

The source gas containing an impurity of sulfur compounds, under pressure up to 4.5 MPa heated to 350-400With in the heat exchange elements placed in the unit combustion apparatus 1 in the area after the overheating of the water vapor along the flue gas or to increase the achieved effect in two consecutive steps in the direction of gas flow: first, in the area near the exit flue gas, then in the area before the heat exchange elements to heat the feed water.

Then the gas enters the desulphurization devices 2, 3 and after adding water vapor and heat parovoi conversion of gas-vapor mixture is supplied to vapor conversion 7 and then is sent for further processing in the conversion FROM and to clearing of CO2and WITH the. Block heat utilizing apparatus 1 includes heat exchangers, located in series along the flue gas zones to heat the gas mixture, the steam-air mixture and overheating of the water vapor pressure of 8.8-10.9 MPa to a temperature of 475-500With, as well as in the areas of feedwater heating and preheating of the fuel gas. The flue gas after heat recovery unit heat utilizing apparatus 1 using the exhauster 5 come into the exhaust pipe 6.

Example 1

In accordance with the invention presents a method for production of synthesis gas for ammonia production capacity of 1360 tons/day with the heat source gas in the heat exchange elements placed in the unit combustion apparatus 1 in the area after the overheating of the water vapor along the flue gas.

In the heat exchange elements is supplied source gas under pressure up to 4.5 MPa at temperatures up to 130C.

The flue gas temperature after overheating water vapor - 430-500C. After the heat exchange of the heating elements the temperature of the source gas 350-400With, and flue gas - 390-450C. Firing the heater heating the source gas desulfurization ISE the use of heat and reduce the temperature of exhaust flue gas while maintaining the heating mode other environments in the unit combustion equipment within the allowable. In addition, the exclusion of fire heater unit and eliminates the flow of fuel gas for him. In the end, the saving of fuel gas in the heat equivalent is 3.2 million kcal/hour compared to known methods.

Example 2

Presents a method for production of synthesis gas from example 1 with the same source data, but with the heat source gas desulfurization unit of thermal equipment in two consecutive steps in the direction of gas flow: first, in the area near the exit flue gas, then in the area before the heat exchange elements to heat the feed water.

This solution provides the additional use of heat recovery flue gas as compared with example 1, which conserves fuel gas in the heat equivalent to 5 million kcal/hour compared to known methods.

In connection with the use as a coolant flue gas temperatures up to 500With, and to eliminate the use of alloy steels for the manufacture of heat-exchange elements of the heat source gas by the invention provides protection against overheating when the bus stops and supply environments, implemented in two stages: first, the con is owocnego nitrogen, fuel gas and other

Claims

1. Method heat recovery with the production of synthesis gas for production of ammonia and methanol from natural gas or other hydrocarbon raw material containing impurities of sulfur compounds, carried out by chemosorption-catalytic desulfurization under high pressure and temperature with a heat source gas, steam reforming of hydrocarbons in a tubular furnace by combustion of fuel gas and heat recovery of flue gas in the combustion unit equipment, including heat exchange elements located in series along the flue gas zones to heat the gas mixture, the steam-air mixture and overheating of the water vapor pressure of 8.8-10.9 MPa, temperatures of 475-500C, as well as in the areas of feedwater heating and preheating of the fuel gas, wherein the heat source gas for hemosorption-catalytic desulfurization carry out flue gas tube furnace in heat exchange elements placed in the unit combustion equipment in the area after the overheated water vapor.

2. The method according to p. 1, characterized in that the heat source gas for hemosorption-catalytic services the area near the exit flue gas, then in the area before the heat exchange elements to heat the feed water.

3. The method according to one of the p. 1 or 2, characterized in that the overheat protection heat exchangers for heating the source gas desulfurization at bus stops and supply environments provide first controlled discharge gas after the heat exchange elements, then the supply of protective gas environment, which can be used, for example, nitrogen purge, fuel gas and other

 

Same patents:

The invention relates to the field of industrial power engineering and chemical technology and can be used to obtain the synthesis gas in the production of synthetic ammonia

The invention relates to the field of industrial power engineering and chemical technology and can be used to obtain synthetic ammonia

Power plant // 2211342
The invention relates to a power system, in particular to energy plants operating on a mixture of steam and combustion products

The invention relates to a method for the production of energy with high efficiency

Power plant // 2190104
The invention relates to a power system, in particular to energy plants

Unit // 2174611
The invention relates to power units of thermal power plants (TPP), vehicles and is used for generation of electricity and thermal energy

The invention relates to power engineering, transport engineering, engine

The invention relates to processes of reforming of natural gas for ammonia production

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
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

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!