JPS58155209A - Method of operating electricity generator driven by turbine with heat-recovered steam - Google Patents

Abstract

PURPOSE:To diminish electricity to be bought on a contract, by positively driving an electricity generator with a heat-recovered steam turbine to fully use the electricity generation capacity when the total electricity use of a factory is at the peak. CONSTITUTION:The total amount of use of electricity at present is detected by a judgment and control unit 11. Valves 7-9 are regulated by the output of the unit 11 to control the flows of steam in a high-pressure bleeder turbine 2 and a heat recovery turbine 4. The turn-on and turn-off of a switch 12 for transmitting the output of an auxiliary electricity generator 6 to an electricity consumption equipment is controlled. A detection signal corresponding to the total used quantity L of electricity at present and produced through a pulse detector 57 and a precision wattmeter equipped with a transmitter is compared with the allowable level D of the total amount by the unit 11. When the quantity L is lower than the level D, the bleed control valve 7 is fully opened and the heat- recovered steam feed control valve 8 is entirely closed and the switch 12 is turned on so that the electric power of the auxiliary electricity generator 6 driven by a low pressure turbine 5 is added to power lines.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an operating power/l of a Tahif generator driven by steam obtained by recovering exhaust heat from factory equipment, etc.
Regarding this, in more detail, the amount of electricity used depends on whether the specified 1fC total power usage equipment's actual power usage is in line with the permitted power usage amount agreed between the business establishment and the electric power company. A method VC for selectively operating a heat recovery steam driven Tahif generator.

Relatively large business establishments have in-house power generation facilities to cover a portion of their electricity needs. In addition, in recent years, with energy conservation, waste heat from factory equipment is actively recovered using exhaust heat recovery boilers, and the obtained steam is supplied to the steam-using equipment in the factory. A V is used to drive the generator.

An example of its outline can be explained with reference to Fig. 1. 1 is a large boiler, and the generated steam drives a high-pressure extraction turbine 2, which rotates a main generator 3, which supplies part of the 1L power required. Ru. 4 is a -[exhaust heat recovery boiler that recovers waste heat from the field equipment, where? The steam is supplied to the steam facility A of the factory, and the steam drives a low-pressure turbine 5, which generates 6 times + 1 g as auxiliary generator 14L + 1 - electric power. .

In this advanced equipment, it is more efficient and economical to send the steam from the heat recovery boiler 4 to the steam using equipment A than to send the steam from the high pressure extraction turbine 2 to the factory's steam using equipment A. Because it is advantageous in terms of performance, the steam from the waste heat recovery boiler 4 can cover the amount of steam required by the steam-using equipment A, and if the amount of steam required by the steam-using equipment A is small or 115 (When the amount of steam increases and becomes excessive, the surplus amount is input to the low pressure turbine 5 and the auxiliary generator 6 is operated.) In other words, the extraction adjustment jf7 is generally closed. , exhaust heat - [Field air supply adjustment valve [8 is open, low LL turbine air supply adjustment valve is closed] F or open depending on the case. Therefore, in any case, the low pressure terpino 5 is stopped, or if there is excess waste heat recovery steam, the VC
-B-I-C Operation at low output (7) Even when the total power consumption of the factory reaches its peak, such as during the daytime during the wheat season, and when it is originally Even if a low-pressure turbine has a considerable power generation capacity, the turbine must be stopped or the output operation reduced. If electricity is to be purchased, the power purchase contract shall be made with a maximum capacity of 100% per year plus a margin.However, due to the same number of peaks in power use per year,
(Use of gravity in power purchase contracts) It is extremely uneconomical to have one value restricted.

The present invention was proposed in order to solve such problems, and the total power consumption in the business office is at its peak vc,
i8! At this point, we decided to actively operate the waste heat recovery boiler and turbine generator, which had not been used effectively in the past, to fully utilize the original private power generation capacity. The purpose is to improve economic efficiency by covering a considerable amount of the total electricity consumption and thereby reducing the pre-purchase cost in the electricity purchase contract.

The present invention provides equipment 1/(m If the total power consumption of all power-using equipment is less than the permissible power usage limit, the VC will stop or reduce the output of the exhaust heat recovery low-pressure turbine generator, and If the temperature is below the limit, the exhaust heat recovery low-pressure turbine generator is started or put into a high output state, and at the same time, the steam supply to the steam-using equipment is covered by the steam from the main gas high-pressure extraction turbine. That is.

Here, the allowable power usage limit is general V, daytime V in this summer
It is determined appropriately based on the peak value of the total power consumption of the field during one year of VC.As an example of the determination method, we will compare the conventional method and the method of the present invention. This will be explained conceptually in Figure 4. Conventionally, in-house power generation was 44,000kw/f (while purchased power was the same <42.0kw/f).
00 kw/H (4) 7vIJ easy fIJU, 42,000
If you purchase a contract with kW/f (a), the total electricity usage during the daytime in summer will be at a peak value of 79,000 kW/I-1, and considering the contract surplus rate of 20%, the total electricity consumption will be 86.00 kW/f (contract). (This is because I want to have w/11's ability to use an electric gradient + iJ function.

Insufficient power amount 79,000-44,000 will be in charge. Of course, in reality, the amount of private power generation varies slightly at each point in time, but to simplify the explanation, it is assumed that the amount of private power generation is constant.

In contrast, the method of the present invention sets the allowable power usage limit I7 to be slightly lower than the peak value, and actively operates the low-pressure turbine generator (l'C) at no higher than this allowable limit I7. and increase the amount of in-house power generation by that amount.For example, 5
．． 000 kw/H. As a result, by simple calculation, the power purchase contract is 42,000-
5.0 (lo=37.000 kw/11, this
This is enough to get you through the small peak hours of the summer.

By the way, the method of the present invention has 171. For example, during peak hours, all or most of the exhaust heat recovery steam that was previously being supplied will be transferred to the low-pressure turbine;
Steam from a high-pressure oil-air turbine is supplied to the steam-using equipment in the V field. In this case, the purity of power generation by the high-pressure bleed air turbine will be reduced by the amount of air supplied, and it is possible that the power generated by the high-pressure bleed air turbine will be reduced by rL, but since the capacity of the high-pressure bleed air turbine is large, even if air is sent to equipment that uses normal steam, the output will decrease. In reality, there are almost no Even if there is a small amount, as mentioned above, the economic efficiency brought about by reducing the amount of contracted electricity purchased due to the active operation of the low-pressure turbine generator (C) will more than compensate for the shortfall.

Next, a specific example of the present invention will be explained with reference to FIG. In the figure, the same parts as in the conventional example are designated by the same reference numerals.
0 is a reverse 1L piece. In this example, the judgment control device 11 detects the current total power usage, and based on this 7L, the steam from the high pressure extraction turbine 2 and the exhaust heat recovery boiler 4b.
The flow of steam is controlled by adjusting each tf7 and tf8.9 @11~, and the output f of the developed electric machine 6 is configured to turn off/off the switch 12 for feeding the output to the electric power usage equipment. I'm here.

The electric power from the purchasing market source 50 is supplied to each gravity-using equipment via the transformer 52, and the signal from the transaction month 1 rule unit 51 is transmitted to the transmitter with the electric power 5153 and the maximum demand electric power El.
'54 VC is humiliated. At that time, the power h with the transmitter
153 output j) to a pulse detector (or converter) 5
5 detects the current total power consumption by the precision electric power meter with transmitter 56 and the pulse detector (or converter) 57, and detects the current total power consumption by using this signal and the pulse detector 55. Based on the signal and 6C, operate the relay box 60 from the manual or automatic dend monitoring control device #58, 59vc, and then close each valve 7, 8, 9, and 12.
Perform all operations.

Such judgment operation is performed in accordance with chart 70-(7) shown in FIG. First, it is determined whether or not the current total power consumption is equal to or higher than the allowable power consumption limit. Make a decision and be up and running: rL
If it is open, it will be END, and if it is open during operation, it will be determined whether the bleed air regulating valve 7 is open or not. In order to supply air to the
Close.

On the other hand 1. When L is less than 0, that is, when the current total power consumption is at or close to the peak, it is determined whether the low-pressure turbine 5 or the developed electric machine 6 is operating, and if it is operating, a command is given to increase its output. If it is not in operation, it issues a command to operate the low-pressure turbine 5 and then issues a command to increase output.

Next, it is determined whether the bleed air regulating valve 7 is fully open or not, and if it is not fully open, a fully open command is issued, and if it is fully open, it is determined whether the exhaust heat factory air supply regulating valve 8 is fully closed. If it is fully open, it will be END, and if it is not fully open, it will issue a fully close command. In addition, it spreads.

In addition, each valve 7, 8.9 has been explained as opening and closing, or of course, the diversion can also be adjusted. -Adjust it.・5. 1) As described above, when the total power consumption reaches its peak or is close to its peak, the present invention is able to monitor the exhaust heat recovery status of the exhaust heat recovery boiler, regardless of the total power consumption. This will actively allow the exhaust heat recovery steam-driven turbine generator to fully utilize its original capacity, compared to the exhaust heat recovery steam-driven turbine generator that was previously operated, resulting in a significant reduction in the contracted power purchase amount. Can be done. In addition, since there is a small peak period in a year for contract power purchasing, considering the fact that VC does not have to make decisions, it is possible to overcome this small period by generating electricity from a low-pressure turbine generator. It is extremely economical to suppress contract electricity purchases.Moreover, fortunately, the steam to be sent to the steam-using equipment is not only the steam from the exhaust heat recovery boiler, but also the steam from the high-pressure extraction turbine. Even if the amount of steam is supplied by this amount, since the capacity of the high-pressure extraction turbine is small, there is virtually no reduction in the amount of power generated by the 7-ton main generator connected to the high-pressure extraction turbine. Moreover, it has the remarkable effect of increasing the amount of private power generation.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet showing a conventional example, FIG. 2 is a flow sheet showing an example of the method of the present invention, FIG. 3 is a flowchart 1 showing an example of judgment operation according to the method of the present invention, and FIG. FIG. 3 is a diagram showing the temporal fluctuation correlation of power consumption for comparing the invention method with the conventional method. 2. High pressure extraction turbine 3. Main generator 40. Exhaust heat recovery boiler 5.Low pressure turbine 6.Developed electrical equipment
7,8.9...Adjusting valve 11...Judgment control device 12
・Switch diagram 1

Claims (1)

[Claims] (1) For equipment configured to supply steam from a high-pressure extraction turbine and an exhaust heat recovery boiler to steam-using equipment, and to drive an exhaust heat recovery low-pressure turbine generator with steam from the exhaust heat recovery boiler, If the total power consumption of the equipment used is less than the allowable limit for power use, C will stop the exhaust heat recovery low-pressure turbine power generation @ or put it in a low output state, and if it is above the allowable limit for power use. Exhaust heat recovery steam dynamic turbine power generation is characterized in that the exhaust heat recovery low-pressure turbine generator is started or put into a high output state, and at the same time, the supply of steam to the steam-using equipment is mainly covered by steam from the high-pressure extraction turbine. How to operate the machine.