JPH01244117A - Turbo type combustion device - Google Patents

Abstract

PURPOSE:To improve general purpose property through reduction of the feed initial pressure of gas fuel, by providing an ejector to suck and mix fuel gas along with injection of pressurized steam. CONSTITUTION:A flow passage 28 through which pressurized steam is fed is connected to a burner 2. An ejector 13 to suck and mix fuel gas through a fuel passage 14 along with injection of pressurized steam is mounted as a fuel feed means. Fuel gas, having low feed initial pressure, through a fuel passage is boosted through the action of pressurized steam to feed a high pressure to the burner 2. This constitution enables reduction of a feed initial pressure and improvement of general purpose property.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a combustor that burns gas fuel from a fuel passage with pressurized air from a compressor, and a gas fuel driven by hot air from the combustor. The present invention relates to a turbo combustion device in which a turbine is linked to the compressor.

[Conventional technology]

Conventionally, it was possible to perform high-load combustion by simply connecting a fuel line with low pressure, such as a city gas supply pipe, to the combustor and mixing only the combustion air from the compressor with the gas fuel in the combustor. 'It was composed of sea urchins.

[Problem to be solved by the invention]

However, the NOx concentration of the exhaust gas tends to be as high as, for example, 150 ppm, and there is room for improvement in terms of air pollution prevention.

In addition, in order to improve versatility, if the gas fuel supply source pressure is lowered, for example to about 1.2 kg/cffl-G in the city gas medium pressure line, the turndown ratio in self-blade operation will be 1; 2.0. The turndown ratio was insufficient for practical use.

An object of the present invention is to lower the gas fuel supply source pressure and increase versatility, while simultaneously and sufficiently achieving lower NOx and increasing the turndown ratio by rational means.

[Means to solve the problem]

The characteristic configuration of the present invention is to provide a flow path for supplying pressurized steam to a combustor for burning gas fuel from a fuel path with pressurized air from a compressor, and to eject pressurized steam from the flow path. An ejector that sucks and mixes gaseous fuel from the fuel passage is provided as a fuel supply means to the combustor, and its effects are as follows.

[For production]

That is, for example, 5-10 kg/ctl- from the boiler
When the high-pressure steam of G is supplied to the ejector as pressurized steam, the pressure of the gas fuel from the fuel path whose source pressure is relatively low is increased by the action of the pressurized steam, and the gas fuel is supplied from the ejector to the combustor at high pressure. , the turndown ratio is, for example, 1;
4, which can be sufficiently expanded compared to the prior art described above.

To explain further, in a turbo combustion device, the minimum gas fuel supply amount that allows self-operation and the air supply pressure from the compressor at that time are constant as device characteristics, and as the gas fuel supply amount increases, the air supply pressure from the compressor increases. rises.

The maximum gas fuel supply amount is constant as a device characteristic so that the air supply pressure of the compressor at that time is approximately equal to the gas fuel supply pressure. Therefore, the higher the gas fuel supply pressure is, the larger the maximum gas fuel supply amount can be, and the turndown ratio can be expanded.

Furthermore, by supplying an appropriate amount of steam to the combustor, the flame temperature of the combustor can be appropriately lowered, and the N[lX concentration in the exhaust gas can be significantly reduced, for example, to less than half of the conventional value.

〔Effect of the invention〕

As a result, the gas fuel source pressure is lowered, increasing versatility, while reducing NOx and increasing the turndown ratio all at once, resulting in turbo-type combustion that is even better in terms of environmental hygiene and ability to respond to load fluctuations. We are now able to provide equipment.

〔Example〕

Next, examples will be shown with reference to drawings.

At the bottom of the first water tank (1), there is a combustor (
A combustion chamber (3) is formed for the combustion chamber (3), and a number of first smoke pipes (4) connected to the combustion chamber (3) are provided in the upper and lower middle of the first water tank (1), and the hot air from the combustor (2) is A first exchanger (^) is formed to evaporate the water stored in the first water tank (1).

A large number of second smoke pipes (5) connected to the first smoke pipe (4) are provided above the water storage surface (11L) of the first water tank (1),
A second heat exchanger (B) superheats the steam generated in the first water tank (1) with hot air from the combustor (2) and sends it to the recovery path (6).
has been formed.

A second water tank connected to the water supply channel (7) is located above the first water tank (1).
A water tank (8) is provided, a number of third smoke pipes (10) connected to the second smoke pipe (5) and the exhaust path (9) are provided in the second water tank (8), and water from the water supply channel (7) is burned. The water storage surface (
A water preheater (C) is formed to supply hot water so as to maintain WL) within a set range.

In short, water and steam are passed through the feed water preheater (C), the first heat exchanger (A), and the second heat exchanger (B) in this order, and the combustor (2
) The steam is heated with hot air from the
It is structured so that it can be obtained from

A compressor (12) is interposed in the supply path (11) of combustion air to the combustor (2), and low pressure gas fuel is supplied from the fuel path (14) at a rate of about 1.2 kg/cnf-G. The combustor (2) is configured to supply an amount of pressurized air to the combustor (2) for complete combustion.

A gas turbine (16) driven by the hot air is provided in the supply path (15) that sends hot air from the first heat exchanger (A) to the second heat exchanger (B), and the gas turbine (16) and the compressor ( 12) are interlocked and connected so that the compressor (12) is driven by the energy of the hot air.

A filter (18) and a check valve (19) are provided in the air suction passage (17) of the compressor (12), and an electric blower (20) for starting is connected to the air suction passage (17) of the compressor (12). (20) is configured to send combustion air, and the compressor (12) is configured to send air sucked from the filter (18) to the combustor (2) during self-blade operation.

5 to 10 kg/kg from the second heat exchanger (B) to the combustor (2)
A flow path (28) for supplying pressurized steam of c The structure is such that an appropriate amount of water vapor can be supplied through the flow path (28) to lower the Noxal level of the exhaust gas from the exhaust path (9).

The fuel passage (14) is ejected from the flow passage (28).
) ejector that sucks and mixes gas fuel from (13
) is provided as a fuel supply means to the combustor (2), and the gas fuel supply pressure is increased by the action of the ejector (13), so that the turndown ratio can be increased by increasing the combustion chamber load. .

Oil tank (21), electric oil pump (22),
An oil cooler (23) that uses cold water from a water supply channel (7) is connected to a lubricating oil circulation path (24) for a rotating shaft that links a gas turbine (16) and a compressor (12)
25).

[Another example]

Next, another embodiment will be described.

The combustion method of the combustor (2), the type of gas fuel, and the source pressure can be changed as appropriate.

The amount and pressure of steam supplied through the steam supply flow path (2B) can be appropriately selected, and the steam supply source may be a separately priced boiler or the like. That is, the boiler may be omitted and the hot air from the gas turbine (16) may be supplied to another device as a heating source or oxygen-containing gas for combustion.

The steam amount control valve (29) may be manually operated or may be automatically operated by a controller to maintain the flame temperature of the combustor (2>) within a set range.

The specific structure of the boiler can be changed as appropriate; for example, the number of heat exchangers (A) and (B) may be one or three or more.

Note that although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structures and methods shown in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings are conceptual diagrams showing embodiments of the present invention. (2)...Combustor, (12)...Compressor, (13)...Ejector, (1
4) Fuel path, (16) Gas turbine, (28) Steam supply flow path, (A)
, (B)... Heat exchanger.

Claims (1)

[Claims] 1. The fuel path (
14) is provided with a combustor (2) for burning gas fuel from the combustor (2), and a turbo combustion device in which a gas turbine (16) driven by hot air from the combustor (2) is linked to the compressor (12). A flow path (28) for supplying pressurized steam to the combustor (2) is provided, and gas fuel from the fuel path (14) is discharged as the pressurized steam is ejected from the flow path (28). A turbo combustion device that is provided with an ejector (13) that performs suction and mixing as a fuel supply means to the combustor (2). 2. Provide steam generation heat exchangers (A) and (B) heated by hot air from the combustor (2), and the heat exchanger (A)
, (B) are connected to the flow path (28) for supplying the pressurized steam.