JPS58200013A - Gasification power generating device - Google Patents

Abstract

PURPOSE:To cause a power generating device to produce a higher output by a method wherein the device is provided with a gas turbine for supplying compressed air to a gasification device, a steam producing device to which a discharged gas from the gas turbine is guided and a steam turbine to which a steam of the steam producing device is guided. CONSTITUTION:A gas turbine 1 is supplied with fuel gas from a gasification furnace 8 through a turbine 17 and a combustion unit 3. Combustion gas from the turbine 4 is guided to a steam producing unit 6 of steam cycle 7 as a combustion air. In this way, since a thermal input for the steam producing unit 6 is increased, the steam turbine can be made to have a high output. Further, it is possible to improve a thermal efficiency of the gasification power generating device.

Description

[Detailed description of the invention] The present invention relates to a gasification power generation device.

High efficiency is achieved by combining a gasification device for oil or heavy oil with a power generation device that consumes the gas produced in this gasification device as fuel, and by secretly transferring heat between the gasification device and the power generation device. Gasification power generation is aimed at achieving this goal. In gasification power generation, it is difficult to store a large amount of fuel gas produced by the gasifier, so the fuel gas produced by the gasifier is immediately supplied to the power generator.

Conventionally, power generation equipment for gasification power generation uses a combined cycle consisting of a combination of a gas turbine and a steam turbine to increase efficiency. The generators feed the respective gasifiers. In a gasifier, coal or heavy oil reacts with air and steam, which are gasifiers, to produce fuel gas containing hydrogen and carbon monoxide as main components. The reaction in this gasifier takes place under pressure,
Therefore, the gasifying agents, air and steam, are supplied to the gasifier at axial pressure. The gas generated in the gasifier undergoes dust removal and desulfurization operations and is supplied to the power generation equipment as fuel gas. - The combined cycle consisting of a combination of a gas turbine and a steam turbine used in conventional gasification power generation The exhaust heat recovery cycle is used in which the gas is supplied only to the combustor of the gas turbine, and the steam generated by the exhaust heat recovery steam generator is used to drive the steam turbine using the amount of heat contained in the exhaust gas of the gas turbine. The problem was that the output was small, making it difficult to increase the output of the power generator.

On the other hand, in the Cascubine, air compressed by a compressor is guided to a combustor, and the combustion gas obtained by burning fuel in the combustor is guided to a turbine to drive the turbine, and this turbine drives the compressor and Drive the generator
In gas turbines, in order to improve thermal efficiency, it is necessary to warm up the turbine inlet temperature during the day, but this temperature is limited by the heat resistance of the turbine blades, and the maximum temperature currently in practical use is 1800°C.
It is. In the combustor of a gas turbine, the combustion gas is diluted with compressed air in order to lower the temperature of the combustion gas to a value of L'1m+, t@. For this reason, the turbine exhaust contains a large amount of oxygen that does not contribute to combustion, and since the turbine air has an island temperature, this turbine exhaust can be used as combustion air to burn fuel. . actually 0
As a combined cycle of a gas turbine and a steam turbine using stored fuel such as oil or process gas,
Exhaust reburning cycles are already in use, in which gas turbine exhaust is introduced into a steam generator as combustion air.

The present invention has been made in view of the above circumstances, and its purpose is to provide a means for increasing the output of a gasification power generation system.

An embodiment of the present invention will be described below based on the drawings.

1 Bacaster There is a bin t, and this gas turbine 1 has a compressor 2. Combustor 3. It is equipped with a turbine 4 and a compressor 2.
The air compressed at The compressor @2 and the generator 5 are driven by the turbine 4, which is guided and performs KW work. In the combustor 3, the v-burning gas is diluted with compressed air in order to lower the temperature of the combustion gas to a temperature limited by the heat resistance performance of the turbine blades of the turbine 4. Therefore, the combustion gas guided to the turbine 4 contains a large amount of oxygen that does not contribute to the smoldering reaction. The combustion gas that has completed its expansion work in the turbine 4 is still partly contained at the turbine outlet and contains oxygen in many lines, so that it is led to the combustion chamber of the steam generator 6 as combustion air. A portion 7 surrounded by a broken line excludes a steam cycle, and the configuration of this steam cycle 7 is a known reheat regeneration cycle used in steam power plants.

8 is a gasifier, and coal or heavy oil as a raw material is supplied to this gasifier 8 via a pipe 9. In addition, a part of the compressed air exiting the compressor 2 of the gas turbine 1 is further compressed by the booster compressor 10 and is supplied to the gasification furnace 8 via the pipe line 11. Further, as the steam which is a gasification agent, a part of the exhaust gas of the pressure turbine 12 of the steam cycle 7 is supplied to the gasification furnace 8 through a pipe 13.

The gas generated by the above-mentioned gasification reaction in the gasifier 8 is led to a dedusting device 15 through a pipe 14 for dedusting treatment, and is further led to a desulfurization device 16 for desulfurization treatment. .

Reference numeral 17 denotes a turbine, in which the gas exiting the desulfurization device 16 is expanded. A part of the gas is extracted from an intermediate stage of the turbine 17 and guided to the incinerator 3 as fuel for the gas turbine 1, and the remaining gas is expanded in the turbine 17 to approximately normal pressure.

This turbine 17 drives a booster compressor 10 and a generator 18 . The gas expanded to approximately normal pressure in the turbine 17 is guided as fuel to the combustion chamber of the steam generator 6, and is then introduced into the above-mentioned gas turbine 1 in the steam generator 6.
The exhaust gas is burned as combustion air, evaporated and superheated in the steam cycle.

Provide heat for reheating.

As explained above, in the present invention, a gasification device for coal or heavy oil, etc., and a gas generated in this gasification device are introduced as a twisting material, and a gasifying agent is introduced into this gasification device. A cast turbine supplies compressed V air, and the gas generated in the gasifier is guided as fuel, and also generates steam to be supplied as a gasifying agent to the gasifier, and the exhaust gas of the gas turbine is used for combustion. Since it is equipped with a steam generator that is guided as air and a steam turbine that guides the steam generated in this steam generator, it is necessary to increase the amount of gas generated in the gasifier compared to conventional gasification power generation equipment. Although the amount of work required to obtain compressed air in the turbine increases, the heat input to the steam generator increases, so the output of the steam turbine can be increased. It also uses existing steam power plants that use coal or oil as fuel for the steam generator and steam turbine.

By combining the above-mentioned gasification device and gas turbine with this steam power plant, a more efficient gasification power generation device can be easily produced for $J1.

[Brief explanation of the drawing]

Figure 2 is a system diagram showing an embodiment of the present invention. l...Gas turbine, 2...Compressor, 3...Combustor. 4...Turbine, 6...Steam generator, 7...Steam cycle, 8...Gasifier, 12...Leech pressure turbine, 17...
turbine

Claims (2)

[Claims] (1) A gasifier that gasifies coal, heavy oil, etc. A gas turbine that includes a compressor, a combustor, and a turbine, supplies compressed air as a gasifying agent to the gasifier, and directs gas generated in the gasifier as fuel; The gas produced in the gasifier is conducted as fuel, and the exhaust gas of the gas turbine is used as combustion air. What is claimed is: 1. A gasification power generation device comprising: a steam generator that is guided as a steam generator; and a steam turbine that guides steam generated in the steam generator. (2) The apparatus according to claim 1, further comprising a turbine for reducing the pressure of the gas produced in the gasifier to approximately normal pressure and guiding it to the steam generator.