JPS6285136A - Electric power generating method - Google Patents

Abstract

PURPOSE:To improve the energy utilizing efficiency, by applying three or more latent-and-actual heat accumulating type regenerators, increasing the number of heat accumulating regenerators in an excessed gas condition, while increasing the number of radiating regenerators in a high power load condition, in a generator utilizing the heat of burning gas. CONSTITUTION:Plural latent-and-actual heat accomulating type regenerators of four sets, for example, are prepared, and a low pressure coke furnace gas is burned in a combustor 11 in an ordinary condition, feeding the resultant high temperature gas to two regenerators 14 to store the heat. At the same time, a high pressure air is fed from a high pressure blower 15 to the other two regenerators 14 where the heat is already stored to collect the heat, and the resultant high temperature and high pressure air is led to a gas turbine 12 to generate power. When the above accomulation and radiation are completed, the accumulation and the radiation are converted to continue the power generation. On the other hand, when the gas is excessive and the power load is low at night, for example, the excessive gas is burned to increase the combustion amount to accumulate the heat in three regenerators 14 while the heat is radiated from one regenerator 14, to reduce the power generation amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a power generation method particularly suitable for a system for in-house power generation by burning by-product gas such as coke oven gas in a steel plant.

[Prior art and its problems] In steel works, by-product gas such as coke oven gas is burned to generate in-house power, but it is known that the power used fluctuates. Conventionally, in response to load fluctuations such as high energy loads during the day and low energy loads at night, large gas holders have been installed to store by-product gas at night and use it during the day. However, this method can only partially compensate for the imbalance in energy usage between day and night. For this reason, some gas is released at night. A huge gas holder would be required to absorb all of the gas, which is unrealistic considering equipment costs and installation space.

[Purpose of the Invention] This invention was made in view of the above circumstances, and its purpose is to increase the amount of combustion gas burned when there is a surplus of gas at night or when the electric power load is low, and to reduce the amount of power generation. The purpose of this project is to develop a power generation method that can cope with day and night energy load fluctuations by reducing the amount of combustion gas and increasing the amount of power generated when gas is needed or when electricity is under high load.

[Structure, operation, and effects of the invention] This invention is a method of burning gas and using the heat to generate electricity, using three or more latent and obvious heat storage type heat storage devices,
A power generation method in which combustion gas is guided to a part of the heat storage device to store heat, while high-pressure air (or gas) is passed through another heat storage device where the heat is radiated to a high temperature, and then guided to a gas turbine generator to generate electricity. , when there is a surplus of gas at night or when the power load is low, the gas combustion m is increased and the number of heat storage devices is increased.
While reducing the amount of power generation by reducing the number of heat storage units that radiate heat, during the daytime when the power load is high, the amount of gas burned is reduced, the number of heat storage units that store heat is reduced, and the number of heat storage units that radiate heat is increased.
1 amount.

As described above, when generating power while simultaneously storing and dissipating heat using a latent sensible heat storage type heat storage device, the present invention reverses the ratio of heat storage and heat dissipation between night and day and switches between heat storage and heat dissipation. Depending on the gas combustion amount and emission 1! This is a power generation method characterized by controlling the amount.

[Example] The method will be explained below with reference to the illustrated embodiments.

This power generation system consists of 4 latent sensible heat storage type heat storage devices 14
have. Low-pressure coke oven gas is burned and smoked in a combustor 11, and the high-temperature gas generated by the combustion is transferred to two heat storage units 14.
and store heat. - High pressure blower 15 for high pressure air
The heat from the heat storage device 14 is then heated and turned into high-temperature air, which is then guided to the gas turbine generator 12 to generate electricity. As mentioned above, two heat storage devices are normally used to store heat and the remaining two are used to discharge heat.
Once heat dissipation is complete, the system switches between heat storage and heat dissipation to continue generating electricity.

In this power generation system, when load fluctuations occur between day and night, for example, when there is a surplus of gas at night or when the power load is low, the
As shown in a), three heat storage units (for example, NQ 1 to Nα) are installed to burn excess gas, increase the amount of gas combustion, and store heat.
3) Increase the amount of heat storage.

On the other hand, the number of heat storage units that radiate heat is set to one (NQ4) to reduce the amount of heat radiated and the number of power generation layers. Conversely, during high power loads during the day, heat storage and heat radiation are switched, and as shown in Figure 1(b), one heat storage device (Nα1) stores heat and three heat storage devices (Nα1) radiate heat.
2 to NQ4) to reduce the amount of combustion and increase the amount of power generation.

By the above method, it is possible to increase or decrease the amount of combustion gas in response to a surplus or shortage of gas, and to generate electricity by decreasing or increasing the amount of nitrogen generated.

Here, as shown in FIG. 2, the heat storage device 14 preferably utilizes a hot air stove. As shown in an enlarged view in FIG. 3, the heat storage device 17 has a large number of gas circulation vibe groups 19 disposed within a heat storage material filling section 18. The substance to be filled in the filling portion 18 is preferably a substance that changes into solid-liquid at 1300° C. or lower, such as NaF. During heat storage, the high-temperature combustion gas imparts heat to the filler, causing the filler to melt. Conversely, during heat dissipation, the filler applies heat to the air and solidifies it.

Although not shown in the figure, since the exhaust gas from the gas turbine is high-temperature air, using this air as combustion air during heat storage is effective in reducing energy loss.

[Brief explanation of drawings]

FIG. 1(a) is an explanatory diagram showing an example of the power generation method when there is a surplus of gas according to the present invention, FIG. 1(b) shows the power generation method during high power load, and FIG. An explanatory diagram showing an example of a heat storage device, FIG. 3 is an enlarged view of section A in FIG. 2. 11... Combustor, 12... Gas turbine power generation layer, 1
3...Air preheater, 14...Latent and obvious heat storage type heat storage device,
15... High pressure blower, 17... Heat storage device, 18...
Heat storage material filling section, 19...Gas distribution vibe group. Applicant's representative Patent attorney Takehiko Suzue Figure 1 (a) Figure 1 (b)
EM-photochromic power h-1 nin Fig. 2 Fig. 3

Claims (1)

[Claims] In the method of burning gas and generating electricity using the heat, three or more latent sensible heat storage type heat storage devices are used, and the combustion gas is used to store heat in the heat storage device, and a separate high-pressure gas is used to radiate heat from the heat storage device at the same time. A power generation method characterized by increasing the number of heat accumulators that store heat and increasing the number of heat accumulators that radiate heat during high power loads to control the amount of gas combustion and the amount of power generation.