SU1698564A1 - High-pressure steam generator - Google Patents

Abstract

Invention m. used in high-pressure steam generators located in front of high-temperature gas turbines operating in a CCGT cycle. The purpose of the invention is to expand the range of control of the gas temperature at the outlet of the steam generator. In the steam generator with two combustion chambers 1, 6, additional air nozzles 16 and adjustment burners 14 are installed, located respectively in channels 15, 13 on opposite sides of the partition 12, with burners 14 located in channel 13 from the outlet nozzle 19, and the partition 12 m .b. made with a section bent in the direction of the pipe 19. During operation, the combustion products from the channels 13, 15 and the neck 5 meet, mix through the outlet pipe 19 and enter the gas turbine. In this case, the flow rate and temperature of the combustion products are controlled. 1 hp f-ly, 1 ill.

Description

The invention relates to power engineering and can be used in high-pressure steam generators located in front of high-temperature gas turbines operating in a CCGT cycle (combined-cycle plants).

The purpose of the invention is to expand the range of control of the gas temperature at the outlet of the steam generator.

The drawing shows a high-pressure steam generator tower type.

The tower steam generator contains a lower combustion chamber 1. screened by evaporative surfaces 2, bottom burners 3, in the upper part of the lower combustion chamber along the gases there is an evaporation screen 4 and a neck 5. In the upper part of the high-pressure steam generator there is an upper evaporation chamber 6 shielded by evaporation (pa - reheaters) heating surfaces 7, with ceiling burners 8. Behind the combustion chamber, along the gases, a primary superheater 9 is installed, a secondary superheater 10, followed by There is a shielded flue 11, divided by a shielded partition 12 with a section bent toward the exit shielded nozzle. In the split duct 11, adjusting burners 14 are installed on the side shielded wall in the channel 13 formed on the exit side of the gases from the outlet shielded nozzle. In the other duct 15, slot air nozzles 16 are mounted on the side shields, combined by common air

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a box 17 on which a valve 18 is installed. The outlet 19 of a high-pressure steam generator connected to a gas turbine is shielded by heating surfaces.

During operation of a high-pressure steam generator, fuel and air are simultaneously supplied to the lower and upper combustion chambers 1, 6 through hearth burners 3 and heat | full burners 8. In both combustion chambers, combustion and heat exchange occur with the formation of combustion products, which under pressure in several atmospheres and with a high temperature pass, respectively, belonging to each heating chamber of the heating surface. At the same time, fuel in the amount of at least 60% of the total fuel consumption of the high-pressure steam generator is supplied to the lower combustion chamber 1. The combustion products of the lower combustion chamber 1 pass through the evaporation screens 2, then the neck 5 with the temperature of the combustion products close to the temperature of the gases required for the gas turbine. In turn, the rest of the fuel burns in the upper combustion chamber 6. The limitation of fuel consumption is dictated by the danger of metal overheating of the steam superheaters located at the outlet of the upper combustion chamber 6. Combustion products from the upper combustion chamber 6 pass through the high-pressure superheater 9, low-pressure superheater 10 and enter the shielded gas duct 11 with a temperature lower than that for combustion products going to the gas turbine. Behind the flue 11, the combustion products are divided by a shielded partition 12 into two streams. Fuel and air are supplied by burners 14 to the flow of combustion products going to the duct 13, located on the exit side of the shielded nozzle 19. Air is fed into the flow of combustion products going through the other duct 15 through slotted air nozzles 16, the flow of which is controlled by valve 18, set to general

air duct 17. The flow of combustion products from channel 15 affects the temperature of the combustion products coming from the neck 5, correcting it according to

of the required temperature of the combustion products for the gas turbine. Combustion products from channels 13, 15 and neck 5, meeting, are mixed and routed through the shielded outlet pipe.

19 to the gas turbine,

Thus, the proposed design of a high-pressure steam generator allows its use with high-temperature gas turbines, which significantly increases the efficiency of the combined-cycle plant, increases the reliability of the plant as a whole and reduces the intensity of the high-pressure steam generator.

Claims (2)

1. A high-pressure steam generator containing a power case with combustion chambers connected by its gas. passages to a common screened outlet pipe and each equipped with burners and superheater heating surfaces, and in the duct of one of the combustion chambers along the gases after the heating surface at least one longitudinal screened partition is installed with the formation of at least two channels connected in parallel along the gases, different the fact that, in order to expand the range of regulation of the temperature of gases at the outlet of the steam generator, it additionally contains air nozzles and the burners installed in these channels on opposite sides of the partition, and the burners are located in the channel from the outlet of the pipe. 2. The steam generator according to claim 1, 1, and tl and h a y and with the fact that, in order to increase 5 reliability, the partition is made with a plot, bent in the direction of the outlet pipe.