JPH08270460A - Blast furnace gas burning gas turbine - Google Patents

Abstract

PURPOSE: To constitute in such a way as to prevent the lowering of performance and corrosion caused by moisture and harmful components contained in blast furnace gas. CONSTITUTION: In a blast furnace gas burning gas turbine with blast furnace gas as a fuel, a chevron vane type demister is disposed in a fuel gas pipeline for leading blast furnace gas. In this chevron vane type demister, a large number of bent plates 3 are fitted across an upper and a lower frames 1, 2, and mist collecting plates 4 are fitted to the bent plates 3 at every bend. Mist in the blast furnace gas flowing in a gas flow direction along the walls of the bent plates 3 is caught by the collecting plates 4 so as to flow down to a lower groove 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace gas-fired gas turbine which uses waste gas from a blast furnace as a fuel.

[0002]

2. Description of the Related Art Blast furnace gas is a waste gas of a blast furnace and is a kind of producer gas and combustible gas. The gas composition of the blast furnace gas is carbon monoxide (CO), nitrogen (N ₂ ) and carbon dioxide (C
O _2), etc., the heating value is low (900Kcal / Nm ^3).

In the blast furnace gas, sodium (Na), potassium (K), etc., which are hard water components, sulfur compounds (SO ₂ , SO ₃ ), nitric acid compounds (NO _x ), organic matter, and other moisture are contained. In addition to containing components that are extremely harmful when they act, they also contain dust such as iron oxide (FeO, Fe ₂ O ₂ ).

Moisture in the blast furnace gas becomes saturated or supersaturated depending on the operating condition on the blast furnace side and is carried into the fuel gas pipe, but becomes mist by cooling the fuel gas pipe.

[0005]

When the blast furnace gas having the above-mentioned properties is sucked into the fuel gas compressor, it becomes a clay-like substance due to mist and dust, which adheres to the blade surface and deteriorates performance and rotation. Causes vibration of the body.

When the blast furnace gas is compressed and the gas temperature rises, the harmful components, the mist, the temperature and the harmful conditions are matched, and the blades and other materials are damaged, and the durability of the rotor is reduced. It shortens the life significantly.

The present invention has been made to solve this problem, and provides a blast furnace gas-fired gas turbine configured to prevent performance deterioration and corrosion due to water and harmful components contained in the blast furnace gas. Is an issue.

[0008]

In order to solve the above-mentioned problems in a blast furnace gas-fired gas turbine using blast furnace gas as a fuel, the present invention provides a fuel gas pipe for guiding the blast furnace gas and a dust collector for removing the blast furnace gas. A blast furnace gas-fired gas turbine having a structure in which a mist separator is installed in either one of the above.

As the mist separator in the blast furnace gas-fired gas turbine according to the present invention, a chevron vane type demister or other known mist separator may be appropriately adopted.

[0010]

In the blast furnace gas-fired gas turbine according to the present invention, as described above, by installing the mist separator (demister) in the fuel gas pipe or in the dust collector, the water content in the fuel gas becomes mist separator. It becomes mist drain and is removed.

Therefore, there is no environment that produces harmful conditions of harmful components in fuel gas, moisture and temperature, and the factors that damage the material of the rotor and shorten the life disappear, and the performance deterioration due to dust adhesion is excessive. No vibration occurs. Therefore, the reliability of the plant components is further improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A blast furnace gas fired gas turbine according to the present invention will be specifically described below with reference to the embodiments shown in FIGS. FIG. 1 is a perspective view of a chevron vane demister as a mist separator arranged in a fuel gas pipe of a blast furnace gas-fired gas turbine according to an embodiment of the present invention.

This demister has upper and lower frames 1 and 2.
A large number of curved plates 3 are passed over and attached. Curved plate 3
A mist collecting plate 4 is attached for each bend, and the mist flowing along the wall surface of the curved plate 3 in the gas flow direction is received by the collecting plate 4 and flows down into the groove 5 in the lower part.

The mist flying along with the gas flow also collides with the curved plate 3 and is collected by the collecting plate 4 by the same action and separated from the gas flow.

Next, FIG. 2 shows a wet electrostatic precipitator for removing dust from the blast furnace gas in a blast furnace gas-fired gas turbine according to another embodiment of the present invention. A mist separator is provided in the precipitator. Is installed. That is, in the wet electrostatic precipitator shown in FIG. 2, a mist separator (demister) 16 is attached to the outlet duct 15 thereof.

In this wet type electrostatic precipitator, fuel gas enters the inlet duct 11 from the direction of the arrow on the left side, passes through the multi-pore lattice window 12, passes through the discharge pole 13 and the dust collecting electrode 14, and is collected and discharged. It reaches the duct 15.

The mist is removed by the mist separator (demister) 16 attached to the outlet duct 15 by the demister action described with reference to FIG. In FIG. 2, reference numeral 17 is a hopper, reference numeral 18 is an internal ladder, reference numeral 1
9 is a dust collector ceiling, and 20 is a manhole.

Although the present invention has been specifically described based on the illustrated embodiments, the present invention is not limited to these embodiments, and the shape and structure thereof are within the scope of the present invention shown in the claims. It goes without saying that various changes may be added to the.

For example, in the above embodiment, a chevron vane type demister is used as the mist separator and the mist separator is provided in the wet electrostatic precipitator, but the mist separator is not limited to this. The dust collector also need not be a wet electrostatic precipitator.

[0020]

As described above, in the blast furnace gas-fired gas turbine according to the present invention, the mist separator is installed in either the fuel gas pipe for guiding the blast furnace gas or the dust collector for removing the blast furnace gas. The separator removes the harmful substances in the blast furnace gas and other factors that reduce the stress of the rotating body due to the impure water mist, so that the life of the rotating body is significantly extended. Therefore, according to the present invention, the reliability of the blast furnace gas-fired gas turbine is further improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a demister in a blast furnace gas-fired gas turbine according to a first embodiment of the present invention.

FIG. 2 is an assembly view of a blast furnace gas-fired gas turbine according to a second embodiment of the present invention in which a demister is attached to the dust collector.

[Explanation of symbols]

 1, 2 Frame 3 Curved plate 4 Collection plate 5 Groove 11 Inlet duct 12 Multi-hole grid window 13 Discharge pole 14 Dust collecting electrode 15 Inlet duct 16 Demister 17 Hopper

Claims (1)

[Claims] 1. A blast furnace gas-fired gas turbine using blast furnace gas as a fuel, wherein a mist separator is installed in either a fuel gas pipe for introducing the blast furnace gas or a dust collector for removing the blast furnace gas. Blast furnace gas fired gas turbine.