The method of combined synthesis gas and electric energy

 

The invention relates to the production of synthesis gas, more particularly to a method for the combined synthesis gas and electricity. The method of combined synthesis gas and electrical energy includes at least a step for synthesis gas by combustion of the secondary fuel flow with air receiving flue gas, the flue gas transmission mode of heat transfer from the steam reforming reactions of hydrocarbons in the heat exchange reactor and the stage production of electricity by combustion of the primary fuel flow with air in the combustion chamber of a gas turbine receiving the combustion gas is subjected to expansion in a gas turbine. This flue gas is withdrawn from the heat exchange reactor is fed to the combustion of the primary fuel flow with air in the combustion chamber of the gas turbine. The invention improves the production of excess electrical energy while improving the efficiency of combustion of the primary fuel flow into the combustion chamber of the gas turbine. 1 C.p. f-crystals, 2 ill., table 2.

The invention relates to the production of synthesis gas, more particularly to a method of combined floor is to be in heat exchange reactors, the advantage is a high degree of convection heat transfer in comparison with heat transfer by radiation, as, for example, of the reformer furnace. This is provided largely by supplying in excess of the combustion air, which limits the temperature of the combustion gases.

Usually in the heat exchange reactor serves a preheated stream of sweet hydrocarbons mixed with steam.

The reforming process is carried out in the presence of reforming catalyst located in the heat exchange reactor. The reforming process proceeds according to the following reactions:The process of steam reforming in the heat exchange reactor causes the carrying out endothermic reactions so that the product exiting the reforming catalyst in the cooling part of the heat required for the reforming process. The remainder required in the reactor heat is provided by burning fuel in the combustion chamber of the heat exchange reactor and by receiving the flow of hot flue gas, which is directed along the external walls of the catalyst layer in the mode of heat transfer is WKR to atmospheric or increased pressure.

Burning carried out with an excess of air to reach the temperature of the combustion gases necessary for the prevailing obtain convection heat transfer to the catalyst through the walls of the catalyst layer.

The synthesis gas produced in the heat exchange reactor, suitable for a number of syntheses, for example methanol, or hydrogen or carbon monoxide following each of the other stages.

In accordance with standard technological scheme of the combustion air serves in excess in the reactor by means of the compressor. The necessary energy for him and other auxiliary equipment (i.e. compressors, blowers, pumps, and so on) in the system based on the heat exchange reactor is achieved by applying external energy or by producing energy on site, usually with steam or gas turbines. By analogy with the heat exchange reactor of the gas turbine requires a significant amount of excess air for combustion in order to control the temperature of the flue gas.

There is a method of combined synthesis gas and electric energy by the combustion of the secondary fuel flow with air receiving flue gas, flue gas transmission mode Teploobmen energy by combustion of the primary fuel flow to the combustion air in the combustion chamber of a gas turbine receiving the combustion gas, the expansion of the combustion gases in a gas turbine. Furnace gas use from one stage (after combustion in the combustion chamber for combustion in another stage (EP 0569796, CL 10 G 9/20, 18.11.93).

In addition, there is a method of combined synthesis gas and electric energy, containing at least the stage of synthesis gas by burning a fuel with air and steam to produce a flue gas and the stage of producing electric energy by use of the combustion gas in the gas turbine (see patent 2111602, CL F 02 To 23/10, 06.07.1983).

The objective of the invention is to increase the production of excess electrical energy while improving the efficiency of combustion of the primary fuel flow into the combustion chamber of the gas turbine.

The problem is solved in the way that the combined synthesis gas and electrical energy, comprising at least a step for synthesis gas by combustion of the secondary fuel flow with air receiving flue gas, flue gas transmission mode of heat transfer from the steam reforming reactions of hydrocarbons in the heat exchange reactor and the stage production of electricity by combustion of the primary fuel flow with in rbine, due to the fact that the combustion gas discharged from the heat exchange reactor is fed to the combustion of the primary fuel flow with air in the combustion chamber of the gas turbine.

According to preferred feature of the proposed method air for combustion of the secondary fuel flow is compressed air from the compressor of the gas turbine.

The proposed method is as follows.

The combustion air required in the heat exchange reactor, is fed into the gas turbine compressor where it is compressed and fed to the combustion chamber heat exchanger steam reactor, where it is used for burning liquid or gaseous fuels to obtain the corresponding flow of the combustion gas as the heating medium in the reactor. Oxygen-containing stream exiting the heat exchange reactor, used for burning additional fuel with receiving the exhaust gas, which is served in a gas turbine expander and, finally, in the General section of the heat recovery.

Installation for the implementation of the proposed and known methods is schematically represented in the attached drawing, where Fig.1 illustrates the invention, and Fig.2 - level equipment.

The drawing shows the following POS - ine feed the primary stream of liquid or gaseous fuel; 2B - supply line of the secondary flow of liquid or gaseous fuels; 3 - line air supply; 4 - gas turbine compressor;
5 - line compressed air for fuel combustion;
6 - combustor heat exchange reactor;
7 - heat-exchange reactor;
8 - line exhaust synthesis gas;
9 - line exhaust flue gas fed either an additional combustion chamber 10 in Fig.1, or not shown on the drawing the General section of the heat recovery according to Fig.2;
10 - additional combustor;
11 - line flue gas;
12 - gas turbine expander;
13 - line drain extended exhaust gas fed or not shown on the drawing the General section of the heat recovery according to Fig.1, or into the combustion chamber 6 of the heat exchange reactor 7 in Fig.2.

Referring to Fig.1, the air from the environment along the line 3 serves in a gas turbine compressor 4, where it is compressed in one or several stages.

The compressed air line 5 is fed to the combustion chamber 6 of the heat exchange reactor 7, where it is in excess injected into reaction with a secondary flow of liquid or gaseous fuel supplied through line 2B, receiving a flow of fuel is constituent for endothermic reforming process, absorbing heat and taking place in the catalytic chamber of the heat exchange reactor 7, where line 1 serves a mixture of hydrocarbons and steam.

Coming out of the reactor 7 flue gas is cooled in the heat and with the remaining unreacted oxygen on line 9 serves in an additional combustion chamber 10, where it is in excess reacts with the first stream of liquid or gaseous fuel supplied through line 2A, to obtain the flue gas exhaust line 11 in the gas turbine expander 12, which extends to a pressure close to atmospheric, and 13 are directed to is not shown in the drawing the General section of the heat recovery.

Produced by the gas turbine, the energy can be used to drive a turbine generator or compressor (not shown).

According to the method according to Fig.2 exhaust line 11 of the exhaust gas expands in the turbine expander 12 to the pressure required for the implementation of the steam reforming reactor 7.

In tables 1 and 2 summarizes the basic terms and results of the process of steam reforming. The data of table 1 show the proposed method, and the data of table 2 - state of the art.

SRO fuel testifies to the achievement of the task.


Claims

1. The method of combined synthesis gas and electrical energy, comprising at least a step for synthesis gas by combustion of the secondary fuel flow with air receiving flue gas, flue gas transmission mode of heat transfer from the steam reforming reactions of hydrocarbons in the heat exchange reactor and the stage production of electricity by combustion of the primary fuel flow with air in the combustion chamber of a gas turbine receiving the combustion gas is subjected to expansion in a gas turbine, wherein the combustion gas discharged from the heat exchange reactor, served on the combustion of the primary fuel flow with air in the combustion chamber of the gas turbine.

2. The method according to p. 1, characterized in that the air for combustion of the secondary fuel flow is compressed air from the compressor of the gas turbine.

 

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