JPH02305351A - Cogeneration system - Google Patents

Abstract

PURPOSE:To independently execute each control of a heat output and electric supply power by supplying an exhaust steam of a steam turbine to a second kind of an absorption heat pump so as to obtain steam having a pressure higher than that of the exhaust steam, and supplying a part thereof to an absorption refrigerator. CONSTITUTION:A suction air is compressed by a compressor 1 to be supplied to a burner 2 and be burnt together with fuel. A gas turbine 3 is rotated by generated high-pressure high-temperature gas, thus driving a generator 4. The gas out of the gas turbine 3 is supplied to a heat boiler 9, thereby generating steam. A steam turbine 10 is rotated with supply of the steam, thus driving a generator 14 for regulating supply power. The steam out of the steam turbine 10 is supplied to a second kind of an absorption heat pump 25, and further, a part of steam in a high pressure steam pipe 11 is supplied to an absorption refrigerator 22 via a decompression valve 15 so as to be utilized as a drive heat source. When the drive heat source of the absorption refrigerator 22 falls short, the steam from the heat pump 25 can be supplied from a steam pipe 31 to the absorption refrigerator 22.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a system that allows the composition ratio of electric power and thermal output to be flexibly changed according to demand in a cogeneration system that extracts electric power and thermal output at the same time.

[Conventional technology]

Figure 4 shows, for example, "Refrigeration", Vol. 62, No. 713, "Air Conditioning/Hot Water Supply System Planning JP 235-240 (Refrigeration Association 1987)".
FIG. 2 is a system diagram showing a conventional cogeneration system shown in the publication published in March 2013. In the figure, 1 is a compressor that compresses intake air, 2 is a combustor that mixes compressed air and fuel and combusts it, and 3 is a gas that serves as a generator driving source in which the high-pressure combustion gas discharged from combustor 2 expands. turbine,
4 is a generator, 5 is an air intake pipe, 6 is a high-pressure combustion gas pipe, 7 is a compressor 1, a gas turbine 3, and a generator 4
8 is a low pressure combustion gas pipe, 9 is an exhaust heat boiler, 15 is a pressure reducing valve, 17 is a medium pressure steam pipe, 22 is an absorption refrigerator, and 23 is a cold water for taking out cold water from the absorption refrigerator 22. An extraction pipe, 24 is a circulation pump for returning condensed water from the absorption refrigerator 22 to the waste heat boiler 9, 28 is a water pipe,
33 is a pressure reducing valve for steam extraction. Next, the operation will be explained. Air taken in through the air suction pipe 5 is compressed by the compressor 1 and enters the combustor 2. Here, the fuel is mixed and combusted, and the combustion gas passes through the high-pressure combustion gas pipe 6 and rotates the gas turbine 3. Therefore, the generator 4, which is directly connected to the gas turbine 3 through the rotating shaft 7, rotates and obtains electric power. Combustion gas leaving the gas turbine 3 passes through a low-pressure combustion gas pipe 8 and enters an exhaust heat boiler 9. Steam is generated in the waste heat boiler 9 by the heat of the combustion gas, and the reduced temperature exhaust gas is exhausted into the atmosphere. The steam generated in the waste heat boiler 9 enters the absorption refrigerator 22,
It acts as the driving heat source. The water that has undergone heat exchange and condensed in the absorption refrigerator 22 is sent to the waste heat boiler 9 again through the water pipe 28 by the pump 24. Chilled water output is obtained from cold water outlet piping 23. In addition, steam output is obtained from the waste heat boiler 9 via a pressure reducing valve 33 for steam extraction.

[Problems to be Solved by the Invention] Since the conventional cogeneration system is configured as described above, when trying to increase the chilled water output of the absorption chiller or the steam output from the waste heat boiler, the In order to increase the amount of heat, it is necessary to increase the amount of combustion gas, and this poses a problem in that it is difficult to flexibly deal with changes in load, such as by simultaneously increasing power supply and heat output. This invention was made to solve the above-mentioned problems, and aims to provide a cogeneration system that can independently control the amount of electric power supplied and the heat output.

[Means to solve the problem]

A cogeneration system according to the present invention includes a steam turbine that drives a power supply adjustment generator by distributing and inputting steam generated in a waste heat boiler using waste heat from a generator drive source, and a steam turbine that drives a power supply adjustment generator. A type 2 absorption pump that inputs exhaust steam from the turbine and, if necessary, inputs steam from the exhaust heat boiler to generate steam with a higher pressure than the exhaust steam; It is equipped with an absorption refrigerator which inputs a part of the absorption heat pump into the exhaust heat boiler outlet steam as necessary.

[For use]

In the cogeneration system in this invention,
The amount of electricity supplied is controlled by changing the amount of steam flowing into the steam turbine, and the exhaust steam from the steam turbine is input to a second-class absorption heat pump to obtain steam at a higher pressure than the exhaust steam, and a part of it is sent to an absorption chiller. It is possible to supplement the heat source input to the absorption chiller, which decreases as the amount of power generated by the steam turbine generator increases.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
FIG. 1 is a system diagram showing an embodiment of the present invention. In FIG. 1, the same or equivalent components as in FIG. In FIG. 1, 10 is a steam turbine, 11 is a high-pressure steam pipe that connects the waste heat boiler 9 and the steam turbine 1o, 12 is a control valve that controls the flow rate of steam flowing into the steam turbine 1o, 13 is a rotating shaft, and 14 is a A generator for regulating power supply directly connected to the steam turbine 10 by a rotating shaft 13; 16 a low-pressure steam pipe guiding exhaust steam from the steam turbine 10 to a second type absorption heat pump 25; 17 a control valve 1;
18 is a condenser for condensing excess steam, and I9 is a control for guiding excess steam from intermediate pressure steam pipe 17 to condenser 1B. 20 is a water pipe for returning the water condensed in the condenser 18 to the waste heat boiler 9; 21 is a circulation pump that sends the water condensed in the condenser 18 to the waste heat boiler 9; 25 is a heat source using low-pressure steam; Type 2 absorption heat pump that obtains higher pressure steam output as
26 is a pipe for extracting steam from the second type absorption heat pump 25, 27 is a pump for sending water condensed from the input steam in the second type absorption heat pump 25 to the condenser 18, and 29 is a pipe for the second type absorption heat pump 25. A control valve for sending heat source steam from the medium-pressure steam pipe 17, 30 a steam flow rate control valve attached to the steam extraction pipe 26 and branched to the medium-pressure steam pipe 17, and 31 an output of the second type absorption heat pump 25. A steam pipe 32 is used to send steam to the medium pressure steam pipe 17 from the control valve 29 to the medium pressure steam pipe 17.
This is a pressure reducing valve for reducing the pressure inside the low pressure steam pipe 16 to the pressure inside the low pressure steam pipe 16. The second operation will be explained. Air taken in through the air suction pipe 5 is compressed by the compressor 1 and enters the combustor 2. Here, the fuel is mixed and combusted, and the combustion gas passes through the high-pressure combustion gas pipe 6 and rotates the gas turbine 3. Therefore, the generator 4, which is directly connected to the gas turbine 3 through the rotating shaft 7, rotates and obtains electric power. Combustion gas leaving the gas turbine 3 passes through a low-pressure combustion gas pipe 8 and enters an exhaust heat boiler 9. In the exhaust heat boiler 9, 1 air is generated by the heat of the combustion gas, and the exhaust gas whose temperature has decreased is exhausted into the atmosphere. Steam generated in the waste heat boiler 9 passes through a control valve 12 attached to a high pressure steam pipe 11 and flows into an intermediate pressure steam pipe 17. After this steam is reduced to a required pressure by the pressure reducing valve 15, it passes through the control valve 29 and enters the absorption refrigerator 22, where it serves as a driving heat source. On the other hand, the steam branched through the control valve 12 enters the steam turbine 10 and is transferred to the steam turbine 1 by the rotating shaft 13.
The power supply adjustment generator 14, which is directly connected to 0, is rotated to generate electricity. Steam leaving the steam turbine 10 passes through the low-pressure steam pipe 16 and enters the second type absorption heat pump 25, which serves as a driving heat source. The water condensed through heat exchange in the absorption refrigerator 22 and the second type absorption heat pump 25 is led to the water pipe 28 by the pump 24 and the pump 27, passes through the water pipe 28, passes through the condenser 18, and is again used as exhaust heat. It is sent to boiler 9. Absorption refrigerator 22
From this, you can get 5 J forces for cold water. In addition, steam output is obtained from the second type absorption heat pump 25. Further, the control valve 12 controls the flow rate of steam flowing into the steam turbine 10, and controls the amount of electric power obtained from the power supply adjustment generator 14. The control valve 12 does not particularly control the flow rate of steam flowing from the high pressure steam pipe 11 to the intermediate pressure steam pipe 17 via the pressure reducing valve 15. Capacity control of the absorption refrigerator 22 and the second type absorption heat pump 25 can be performed by the control functions installed in each of them if the heat source steam pressure is constant. In order to stabilize the heat source steam pressure of the absorption refrigeration a22 and the second type absorption heat pump 25, the control valve 19 controls the recovery based on the measured value of the internal pressure of the intermediate pressure steam pipe 17 by a pressure sensor (not shown in the figure). The flow rate of steam flowing to the water dispenser 18 is controlled. Excess steam flowing into the condenser 1 from the control valve 19 is cooled and condensed by cooling water flowing through a heat exchanger provided in the condenser 18. The amped water is returned to the waste heat boiler 9 by the circulation pump 21 together with condensed water from the absorption refrigerator 22 and the second type absorption heat pump 25. The control valve 29 is connected to the steam turbine 10 with low power demand.
When the flow rate of steam flowing into the second type absorption heat pump 25 is small, the driving heat source of the second type absorption heat pump 25 is insufficient, so steam is flowed from the medium pressure steam pipe 17 to the second type absorption heat pump 25 to supplement the second type absorption heat pump 25. The steam flow rate is controlled so that the pressure of the heat source steam No. 25 is constant. In addition, when the power demand is high and the flow rate of steam flowing into the steam turbine 10 is large, the drive heat source of the absorption refrigerator 22 is insufficient, so the control valve 30 supplies the output steam of the second type absorption heat pump 25 to steam for replenishment and use. The steam flows from the pipe 31 to the absorption refrigerator 22, and the flow rate of the steam is controlled so that the pressure of the heat source steam of the absorption refrigerator 22 is constant. Incidentally, if the steam ratio of the second type absorption heat pump 25 is given priority over the cold water output of the absorption refrigeration 4!22, the output steam of the second type absorption heat pump 25 is branched as shown in FIG. The structure may be such that the steam pipe 31 input to the absorption refrigerator 22 is omitted. In addition, when the steam pressure at the outlet of the steam turbine 10 is always sufficient as the steam for driving the absorption refrigerator 22, as shown in FIG. A method may also be adopted in which the steam is merged with the outlet steam and distributed to the absorption refrigerator 22 and the second type absorption heat pump 25. Furthermore, although the above embodiments have been described using a gas turbine as an example, a gas engine is used instead of the gas turbine. A diesel engine may be used, or a plurality of diesel engines may be used.

【Effect of the invention】

As described above, according to the present invention, the cogeneration system uses the exhaust heat of the generator drive source to generate steam in the exhaust heat boiler, which is then connected to the steam turbine directly connected to the power supply adjustment generator and the absorption refrigeration system. In addition to obtaining electric power and chilled water output by distributing it to the heat pump, the structure is configured to obtain steam output by using both the steam turbine exhaust steam and the steam generated by the waste heat boiler as the heat source of the second type absorption heat pump. The power supply can be controlled almost independently of each other, and therefore the power supply and heat output can be flexibly controlled.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a cogeneration system according to an embodiment of the present invention, Figs. 2 and 3 are system diagrams showing other embodiments of the cogeneration system according to the invention, and Fig. 4 is a system diagram showing a cogeneration system according to an embodiment of the present invention. It is a system diagram showing an example of a cogeneration system. In the figure, 3 is a generator drive tA (gas turbine), 9
1 is a waste heat boiler, 10 is a steam turbine, 14 is a power supply adjustment generator, 22 is an absorption refrigerator, and 25 is a second type absorption heat pump. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A waste heat boiler that generates steam based on the waste heat of the generator drive source, a steam turbine to which the steam from the waste heat boiler is distributed and supplied to drive a power supply adjustment generator, and an exhaust heat from the steam turbine. The steam from the waste heat boiler is distributed to a second type absorption heat pump which inputs steam and, if necessary, inputs steam from the waste heat boiler to obtain a steam output whose pressure is increased from the pressure of the waste steam. A cogeneration system comprising an absorption refrigerating machine which is supplied with steam and into which a part of the steam output from the second type absorption heat pump can be input.