SU1553740A1 - Method of production of peak power of steam-and-gas electric power station - Google Patents

Abstract

The invention allows to increase the generation of peak power in a combined-cycle power plant with in-cycle gasification of solid fuels. The steam and gas power plant contains a gasifier 1, to which pipelines 2, 3, 4 and 32 of the supply of coal, steam, blast air and gasification mixture (exhaust gas of a gas turbine 31) are connected. A peak gas turbine plant comprising a compressor 28, a combustion chamber 29 and a gas turbine 31 is used as the peak source of the gasification mixture. The compressor 28 through the purified water preheater 21 connected to the combustion chamber 29, and the steam turbine high and low pressure heaters 22 and 23 ( parts 15 and 16 high and low pressure) is connected to the pipe 4 of the blast air. If it is necessary to obtain peak power, the supply of steam and blast air to the gasifier 1 is stopped, to which the exhaust gases of the gas turbine 31 of the peak gas turbine unit are supplied as the gasification mixture. The blast air is used to heat the treated water, which is injected into the combustion chamber 29, and the steam turbine condensate. The released steam flow to the gasifier 1 and the steam displaced by the blowing air to the regenerative heating of the condensate generate additional peak power in the steam turbine. 1 hp f-ly, 1 ill.

Description

The invention relates to the field of heat and power engineering and can be used at a combined-cycle power plant I with intra-cycle gasification of solid fuel and with a peak gas-turbine installation.

1 The aim of the invention is to increase peak power (electricity) generation.

The drawing shows a schematic diagram of a combined-cycle power plant where this method is implemented.

The steam and gas power plant contains a gasifier 1 solid fuel, which is connected to pipelines 2-4 of the supply of steam and blast air, respectively. Pipe 4 supplying blast air is connected to the output of the booster compressor 5. Gasifier 1 gas pipeline 6 generator gas communicated through the cleaning device 7 with an expansion gas turbine (WGT) 8 connected at the outlet to the high-pressure steam generator (HSV) 9. Booster compressor 5 that inlet pipe 10 compressed air is connected to the outlet of compressor 11. HSV 9 is connected to the gas turbine (GT) 12 by pipe 13 of the combustion products, and by feed water - with economizer 14. On fresh steam, the STG 9 is connected to the high pressure part 15 ( CWD), and for the second time overheated foMy steam - with part 16 of low pressure (PND) of steam turbine and with gasifier 1. Condensate economizer 14 communicates with low pressure preheater 17 (HDPE) through deaerator 18 And high pressure preheater 19

n 5

,

 , - Q

0

five

nor (lpd). Pipeline 20 for supplying chemically treated water is excluded from heaters 21 of water that is chemically treated and connected to pipeline 4, which is connected to a series-connected high and low pressure air heater 22 and 23 with supply pipes 24 and 25 and condensate return pipes 26 and 27.

The peak gasification mixture source is the peak gas turbine unit, the compressor 28 of which is inlet connected to the blown air pipe 4, the combustion chamber 29 is connected to the preheater 21 and the gas turbine fuel supply line 30, and the gas turbine 31 to the exhaust gas (gas-vapor gasifying gas mixture) is connected to gasifier 1 pipeline 32.

Steam and gas power plant operates as follows.

In the gasifier t pipelines 2-4 supply coal, the second superheated steam and the blowing air from the booster compressor 5, regulating their consumption. The generating gas obtained in the gasifier 1 is fed through the pipeline 6 to the device 7, where it is cleaned of dust and sulfur compounds and then expanded into the RGT 8, which drives the booster compressor 5. The gas from the RGT 8 is burned in the HSV 9, the air in which is burned gas is supplied by compressor 11. Products of combustion of gas through pipeline 13 are fed to IT 12, the exhaust gases of which are cooled in economizer 14 by condensate and released into the atmosphere.

The steam produced in HSV 9 is expanded in the steam turbine FVD 15, reheated again and expanded in BFH 16. The steam used in the BFD 16 condenses, and the condensate is subsequently heated in the HDPE 17. deaerator 18, LFD 19S is saved to economizer 14 and returned to HSV 9 for steam generation.

When peak electricity demand arises, the supply of blast air and steam to the gasifier 1 is stopped. The air is divided into two streams, one of which is heated

and the heating of the condensate in the preheaters 22 and 23, which is released (disconnected from the gasifier 1), with the blowing air displaces the selected steam from the steam turbine (CWD 15 and PND 16) to the heating of the condensate in IND 17 and LDPE 19, which is produced in BF15 and BND 16 additional peak power.

Claims (2)

Formula iso re shadow The method of obtaining peak power chemical water in the preheater 21, 15 chops at the combined-cycle power plant and another - condensate in the air duct nvreM flow control of the blow heater 22 and 23. The cooled air and steam from the steam turbine are blown into the blow air in the compressor 28 of the peak gas turbine unit a gasifier for heating water and connecting the latter to a peak source then into the combustion chamber 29, where gas turbine fuel is also supplied and the chemical water heated in the preheater 21 is injected. The mixture of steam and combustion products is expanded to the pressure of the gasification process. gas turbine 31. Exhaust gases (steam-gas gasifying mixture) through pipeline 32 are directed to gasifier 1, where due to the interaction of carbon dioxide contained in the mixture, oxygen and steam with coal, the generator gas is shmped. The vapor flow displaced into the gas flow 1 disconnected from the gasifier 1 enters the PND 16, where it is expanded, producing additional electrical power. The supply to the combustion chamber 29 of the heated water with the heated blast air increases the capacity of the gas turbine 31 " on the steam and gas power plant nvreM regulating the flow of blast air and steam from the steam turbine to a fuel gasifier; and connecting the latter to a peak gasification mixture source, wherein 5. in order to increase peak power output, stop the flow of blast air and steam to the gasifier, use the peak gas turbine installation, the gas turbine exhaust gases x to the gasifier as the peak gasification mixture source, and blow air to the compressor peak gas turbine unit; cool it before supplying it with chemically purified water, which is injected into the combustion chamber of the gas turbine. 2. The method according to claim 5, wherein the blowing air is divided into two streams, one of which is heating the steam turbine condensate.