JPS62182532A - Gas turbine combustion system for low calorie coal gas - Google Patents

Abstract

PURPOSE:To provide stabilized combustion over the full range from startup to full load by adding beforehand oxygen as needed to a gas turbine combustor for low calorie coal gas. CONSTITUTION:Low calorie coal gas supplied from a supply opening 1 is burned in a gas combustion tube 2 and its flame is led to a gas turbine. The state of flame combustion is detected by a flame detection device 11 and/or the composition of supplied gas is detected by a gas chromatography 10, and a control device 12 controls an oxygen supply valve 6 as needed and a suitable amount of oxygen is added and it is possible to maintain stable combustion. Oil for ignition from a supply tube 5 is only used when starting this device. Further, it is not necessary to supply or enrich oxygen to a gassification furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to multi-shaft series equipment, etc. by suppressing combustion instability that occurs when the calorie content of coal gas generated from an air-blown coal gasifier decreases for some reason. The present invention relates to preventing stall of a turbine in a vehicle.

Conventional technology and its problems The instability of low-calorie coal gas gas turbine combustion is accompanied by a direct reduction in gas turbine output and compressor air pressure, and in severe cases, a loss in the amount of air supplied to the gasifier. There is a risk that this could lead to a serious accident involving the entire combined power generation system.

If extremely low-calorie coal gas is supplied to gas turbine combustion for low-calorie coal gas, or load fluctuations exceeding a certain limit are required, combustion will become unstable and parallel operation of multi-shaft gas turbine power generation will become difficult.

For example, in commercial aircraft, a single series multi-shaft configuration is common, so starting and stopping each axis is considered to be far more frequent than in conventional steam and carbine systems. A gas turbine combustor for low-calorie coal gas has not yet been developed.

Means for Solving the Problems In this regard, the present invention provides that when the combustion state of a gas turbine for low-calorie coal gas becomes unstable, the combustion flame and the input gas components are gear-locked, and if necessary, the gas turbine is directly connected to the gas turbine. The idea is to premix oxygen in the combustor to ensure healthy operation throughout the gas turbine's entire range from startup to full load.

This method limits so-called auxiliary fuels such as oil and LNG to ignition use, and eliminates the need to supply or enrich oxygen to the gasifier, significantly improving the operability and safety of coal gasification combined cycle power generation. Of course.

Example The present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a low-calorie coal gas supply port, 2 is a gas combustion tube, and the flame burned in the gas combustion tube 2 is guided to a gas turbine. 3 is an igniter, 4 is an oxygen supply pipe, 5 is an ignition oil supply pipe, 6 is an oxygen supply valve, 7 is a secondary air supply port, 8 is a support plate for the supply pipes 4 and 5, and 9 is a coal gas passage. Hole 10 is a gas component detection device for detecting the components of the supplied coal gas. Gas chromatography can normally be used as the gas component detection device 10, but the point is to detect gas components such as H, Co, and methane, gas quality, or It is sufficient if the calorie content can be detected. Reference numeral 11 denotes a flame detection device, which usually uses an ultraviolet detector, but may also be of any other type that can detect the ignition state, temperature, etc.; 12 is a control circuit for controlling the oxygen supply valve 6; The opening/closing and opening degree of the oxygen supply valve 6 are controlled to be appropriate based on comprehensive judgment based on the output of the component detection device IO and the output of the flame detection device 11. Simply, the OR of the re-output may be taken and the oxygen supply valve 6 may be opened in the event of any malfunction, but control based on a comprehensive judgment graph is also possible.

Further, the oxygen supply valve 6 can be opened or closed, or the degree of opening can be adjusted appropriately.

Although the ignition oil supply pipe 5 and the oxygen supply pipe 4 are shown as double pipes so that oxygen passes between the inner and outer cylinders,
This design can be changed arbitrarily.

Functions and Effects With the above configuration, the flame detection device detects the flame combustion state and/or the supply gas component state, and the control device i controls the oxygen supply valve 6 as necessary to supply an appropriate amount of oxygen to maintain stable combustion. I can do it. It is sufficient to use ignition oil only when starting the device.

Furthermore, by adopting this device system, it becomes unnecessary to supply or enrich oxygen to the gasifier, and the equipment for that purpose can also be omitted.

[Brief explanation of drawings]

The accompanying drawings are detailed illustrations of embodiments of the present invention. ■...Coal gas supply port? ...Gas combustion pipe, 3...
- Igniter, 4... Oxygen supply pipe, 5... Ignition oil supply pipe, 6... Oxygen supply valve, 7... Secondary air supply port, 8... Support plate, 9... Through hole, 10...Gas component detection device, 11...Flame detection device, 12...Control circuit and above

Claims (1)

[Claims] By pre-mixing oxygen in the gas turbine combustor for low-calorie coal gas as necessary, it is possible to stabilize combustion during unstable operation of the gas turbine, such as during startup, shutdown, load fluctuations, and minimum load operation, and improve the efficiency of the entire complex plant. A low-calorie gas turbine combustion system for coal and gas that aims to ensure healthy operation.