JPH05240061A - Compound generating system - Google Patents

Abstract

PURPOSE:To utilize the fuel so effectively in a way of coping with a load variation by setting up a combustible gas generator, a coal liquefier, a turbine performing generation with combustible gas and liquefied coal, and a liquefied coal storage tank storing excess liquefied coal and simultaneously feeding it to the turbine, respectively. CONSTITUTION:Fuel of coal, etc., air as an oxidizer, etc., and water are fed into a gasifier furnace (combustible gas generator) 1 from respective lines 2-4, thereby generating a combustible gas of hydrogen or the like. A part of this generated combustible gas is fed into a gas turbine 7 from a line 5 via a gas purifier 6, and the rest is fed to a hydrogen separator 10 from a line 11. In addition, this separated hydrogen is fed to a coal liquefier 13 from a line 12. Likewise at the gas turbine 7, the combustible gas and liqufied coal are burned, thereby driving a generator 7a. On the other hand, a liquefied coal storage tank 16 stores amount of excess liquefied coal to be fed out of the coil liquefier 13, and simultaneously feeds this liquefied coal to the gas turbine 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined power generation device for generating electric power using combustible gas and liquefied coal.

[0002]

2. Description of the Related Art In recent years, it has been attempted to generate combustible gas such as hydrogen and carbon monoxide from a fuel such as coal by a combustible gas generator and supply the combustible gas to a gas turbine for power generation. For example, coal is blown together with air into a gasifier under high temperature and high pressure, where coal is partially burned (oxidized) and reduced to generate coal gasification gas (combustible gas),
Some use this as fuel for gas turbines.

[0003]

By the way, in the above-described power generation device, the turbine is rotated by the combustible gas generation device, for example, the coal gasification gas generated in the gasification furnace, and the generator generates electric energy. In addition, the gasifier is designed to meet the demand for electricity during daytime. However, since the power demand fluctuates day and night rather than constant (for example, at night, the power demand is smaller than during the daytime), it is necessary to change the load of the gasifier depending on the power load. Since the inside of the furnace is maintained at high temperature and high pressure by the combustion of coal and the like to partially oxidize and reduce the coal, it is difficult to control when the operating conditions change, and it is not desirable to change the operating conditions. Further, even if the control can be performed, it is necessary to maintain the temperature and pressure inside the furnace at high temperature.For example, when the load is half, it is necessary to blow more than half the amount of fuel into the furnace, resulting in poor power generation efficiency. turn into.

Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a combined power generation device capable of efficiently changing a load.

[0005]

In order to achieve the above object, a combined power generation device of the present invention comprises a combustible gas generation device for generating a combustible gas such as hydrogen, a coal liquefaction device for liquefying coal, and the above-mentioned combustible gas. A turbine for generating power by the combustible gas from the gas generator and the coal liquefaction device and the liquefied coal, and a liquefied coal storage tank for storing the excess liquefied coal from the coal liquefaction device and supplying the liquefied coal to the turbine were provided. It is a thing.

[0006]

The combustible gas generated by the combustible gas generation device and the coal liquefied by the coal liquefaction device are guided to the turbine and, after combustion, rotate around the turbine to generate electric energy in the generator of the turbine. When the electric power load decreases, for example, at a time when the electric power demand is low, such as at night, the fuel to the turbine becomes excessive, and excess liquefied coal from the coal liquefaction device is guided to the liquefied coal storage tank and stored. . As a result, the load can be changed without changing the operating conditions of the combustible gas generation device and the coal liquefaction device, and further, the liquefied coal in the tank can be contributed as fuel to the turbine during normal power load such as daytime. Therefore, even if the load is reduced, the fuel can be effectively used and the load can be changed efficiently.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a combustible gas generator for generating combustible gas such as hydrogen from fuel such as coal.
As this device has a gasification furnace for gasifying coal high temperature (about 1200 to 1600 ° C.) high pressure (about 20~40kg / cm ²⁾ below,
In this embodiment, a case of a gasification furnace as a combustible gas generator will be described.

In the gasification furnace 1, an oxidant line 2 and a water line 3 for blowing an oxidant such as air or oxygen into the furnace 1.
And a coal fuel line 4 are connected. The gasifier 1 partially burns (oxidizes) coal and reduces it to generate a coal gasification gas containing hydrogen and carbon monoxide. The ash generated during gasification of coal is glassy slag. Is discharged as. The coal gasification gas is cooled through a gas cooling unit (not shown) and then flows into the gas line 5.

The gas line 5 is connected to a gas turbine 7 via a gas purification device 6 for desulfurizing and dedusting the gas. An exhaust heat recovery device 8 that recovers a part of the sensible heat of the exhaust gas from the turbine 7 as steam is connected downstream of the gas turbine 7. The steam from the exhaust heat recovery device 8 is supplied to the steam turbine 9, and the steam turbine 9 drives the generator 9a.

Further, a part of the gas from the gas purifying device 6 is introduced to the hydrogen separating device 10 downstream of the gas purifying device 6 in the gas line 5, and the gas from the hydrogen separating device 10 is introduced into the gas line 5. A hydrogen separation gas line 11 for returning the gas is connected. The hydrogen separator 10 separates hydrogen in gas by molecular adsorption, membrane separation, etc., and the separated hydrogen flows into the hydrogen line 12. The hydrogen line 12 is connected to a coal liquefaction device 13, and the coal liquefaction device 13 is connected to a coal supply line 14.

The coal liquefaction apparatus 13 mixes coal (pulverized coal) with heavy oil to form a paste, which is hydrocracked under high temperature and high pressure to produce fuel oil. It is configured to hydrogenate and liquefy coal by the liquefaction method or the like. The coal liquefaction device 13 is connected to a liquefied coal supply line 15 that guides liquefied coal to the turbine 7 as fuel for the gas turbine 7. The gas turbine 7 uses coal gasification gas and liquefied coal as fuel,
These are burned to rotate the turbine 7 to drive the generator 7a. The liquefied coal supply line 15 is connected to a liquefied coal line 17 having a control valve 17a that guides excess liquefied coal in the line 15 to the liquefied coal storage tank 16. The liquefied coal storage tank 16 stores liquefied coal, is connected to a delivery line 18 for sending the liquefied coal outside the system, and the liquefied coal in the tank 16 is liquefied coal line 17 and liquefied coal supply line 15
It is also configured to be supplied to the gas turbine 7 via.

Further, the coal liquefaction apparatus 13 is connected to a residue line 19 through which a residue such as a residue or heavy oil generated during the liquefaction of coal flows out, and the residue line 19 is the gasification furnace. 1, so that the residue is blown into the gasification furnace 1.

Next, the operation of this embodiment will be described.

While the coal is blown into the gasification furnace 1 through the fuel line 4, the oxidant such as air or oxygen from the oxidant line 2 and the water from the water line 3 are blown into the furnace 1, respectively, and the coal is High temperature (about 1200-1600 ℃) High pressure (about 20
It is partially burned (oxidized) and reduced under ~ 40 kg / cm ² ) to produce coal gasification gas containing hydrogen and carbon monoxide as main components.

The produced coal gasification gas flows into the gas line 5 after cooling, is desulfurized and dedusted through the gas purification device 6, and then a part thereof (for example, about a part of the gas from the gasification furnace 1 Half) is led to the gas turbine 7. The remaining gas flows into the hydrogen separation gas line 11, and the hydrogen separation device 1
After the hydrogen in the gas is separated via 0, the gas line 1
It returns to 1 and flows into the gas turbine 7. In addition, in the hydrogen separator 10, about 20 to 30 is contained in the gas from the gasification furnace.
% Hydrogen is included, and it is possible to separate a sufficient amount of hydrogen required for the coal liquefaction unit.

The hydrogen separated in the hydrogen separator 10 is introduced into the coal liquefier 13 via the hydrogen line 12, and in the presence of this hydrogen, the coal from the supply line 14 is liquefied. . The liquefied liquefied coal is supplied to the gas turbine 7 via the liquefied coal supply line 15.

The coal gasification gas and liquefied coal that have flowed into the gas turbine 7 are combusted, and the combustion exhaust gas turns the turbine 7, which drives the generator 7a to generate electric energy.

After the sensible heat of the gas discharged from the gas turbine 7 is recovered by the exhaust heat recovery device 8 and cooled, it is guided to the outside of the system and opened to the atmosphere, for example, through a chimney. The steam generated in the exhaust heat recovery device 8 is supplied to the steam turbine 9 to rotate around the turbine 9 and electric energy is generated in the generator 9a.

During this operation, when the electric power load decreases, that is, when the amount of electric power generation is smaller than during the normal electric power load such as daytime (a time zone such as nighttime when the demand for electric power is low), for example, the liquefied coal line 17 is used. The flow rate control valve 17a is appropriately opened according to the decrease in the load (so that excess fuel corresponding to the decrease in the load flows into the liquefied coal line 17). As a result, fuel corresponding to the load is supplied to the gas turbine 7, and excess liquefied coal from the coal liquefaction device 13 flows into the liquefied coal storage tank 16. That is, the gasification furnace 1 and the coal liquefaction device 13 are operated without changing their operating conditions, only the flow rate of the liquefied coal to the gas turbine 7 is controlled, and the fuel amount to the turbine 7 is adjusted according to the load. Will be done.

Therefore, the gasification furnace 1 and the coal liquefaction device 13 can be simply controlled by controlling the flow rate control valve 17a according to the load.
Since the fuel amount to the turbine 7 can be adjusted without changing the operating condition of, the electric power load can be easily changed.

The liquefied coal storage tank 16 stores and stores surplus liquefied coal at low power demand, such as at night, so that it is stored in the turbine 7 during normal power load such as daytime.
As a fuel to the gas turbine 7 is supplied to the gas turbine 7 through the liquefied coal line 17 and the liquefied coal supply line 15 by a pump (not shown) or the like, the fuel when the load is reduced can be effectively used for power generation. It is possible to improve the power generation efficiency. This makes it possible to efficiently change the load. Further, since the surplus fuel when the load is reduced can be used as the fuel for power generation, the coal liquefaction device 13 can be downsized, and the turbine 7 is driven by the coal gasification gas and the liquefied coal. Since the gasification furnace 1 can be downsized, the entire apparatus can be made compact. Further, since the liquefied coal is guided to and stored in the liquefied coal storage tank 16, it is easy to store the fuel, and the liquefied coal is transported to another plant by a pipeline or the like via the delivery line 18, It can also be used as a raw material for the chemical industry.

Further, in the coal liquefaction apparatus 13, when the coal is liquefied, a large amount of residuals such as residues and heavy oil appears compared to the gasification furnace 1, but the residuals are passed through the residuals line 19. It is blown into the gasification furnace 1. By being blown into the gasification furnace 1 in this manner, most of the fuel is gasified in the gasification furnace 1 because the gasification is performed at a temperature equal to or higher than the melting point of the fuel, so that the fuel contained in the residue is also gasified. As a result, the fuel efficiency is improved, and the rest is discharged as glassy slag that is environmentally harmless, which facilitates the handling of ash.

In this embodiment, coal is used as the combustible gas fuel, but any fuel may be used as long as it produces a combustible gas containing hydrogen or the like, for example petroleum. Liquefied heavy oil, coal liquefaction residue, organic waste, industrial waste, general plastic waste, etc. can also be used as fuel. In these cases, the ash is discharged as environmentally non-polluting glassy slag, which causes a waste problem. Contribute to the solution.

[0025]

In summary, according to the present invention, the combustible gas generation device, the coal liquefaction device, the turbine for generating power by the combustible gas and the liquefied coal, and the liquefaction for storing excess liquefied coal and supplying the liquefied coal to the turbine Since it has a coal storage tank, it has an excellent effect of being able to efficiently change the electric power load.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Gasification furnace (combustible gas generator) 7 Turbine 13 Coal liquefier 16 Liquefied coal storage tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F02C 6/00 A 7910-3G

Claims (1)

[Claims] 1. A combustible gas generation device for generating a combustible gas such as hydrogen, a coal liquefaction device for liquefying coal, and a turbine for generating power by the combustible gas and liquefied coal from the combustible gas generation device and the coal liquefaction device. And a liquefied coal storage tank for storing excess liquefied coal from the coal liquefaction device and supplying the liquefied coal to a turbine.