JPH0874518A - Garbage power generating system using two operating fluid gas turbine - Google Patents

Abstract

PURPOSE: To enable power to be generated by effectively making use of exhaust heat without necessitating any steam turbine power generating facility and any large size low-pressure condenser having pressure less than the atmospheric pressure. CONSTITUTION: In a gas turbine 1, fuel is burnt by a combustor 3, thereby air compressed by a compressor 2 and steam fed from a waste incinerator waste heat boiler pass a turbine part 4 in a state where they are exposed to high temperature, and a generator 5 is operated, so as to generate electric power. Exhaust heat of this gas turbine 1 is recovered by a superheater 7, an evaporator 8, a fuel economizer 10 and a low-pressure evaporator 11, thereby steam is generated, and this steam is injected together with steam fed from the garbage incineration garbage heat boiler to the combustor 3 of the gas turbine 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse power generation system using a dual working fluid gas turbine used for small and medium combustion facilities having a processing capacity of about 200 tons per day.

[0002]

2. Description of the Prior Art FIG. 7 is a system diagram showing a typical prior art dual working fluid gas turbine waste power generation system 50. A waste power generation system 50 using this dual working fluid gas turbine raises the temperature of steam generated in a waste incinerator waste heat boiler, which is a waste heat recovery boiler, to high temperature with the exhaust gas of the gas turbine, and supplies this steam to the steam turbine. This is a waste power generation system that significantly improves the power generation efficiency of waste power generation, and is disclosed in, for example, Japanese Patent Laid-Open No. 5-10107. The above-mentioned steam means water vapor, and hereinafter also means water vapor also in the examples of the present invention, and will be described as steam.

Air entering the gas turbine 1 is compressed by the compressor 2
Becomes high pressure air and enters the combustion chamber 3. The fuel of the gas turbine is supplied to the combustor 3 through the fuel supply line 14 and burns, giving heat to the high-pressure air discharged from the compressor 2, and the high temperature air passes through the turbine section 4 and the generator 5 To generate electricity. The air exiting the turbine section 4 is heated by the superheater 7,
Heat is applied to the evaporator 8, the economizer 10, and the low-pressure evaporator 11, and the temperature is lowered to be discharged from the exhaust stack 13 to the atmosphere.

The supply water supplied to the gas turbine exhaust heat recovery boiler 6 is stored in the water supply tank 21 as pure water suitable for water supply, for example, by the pure water device 22, and is stored in the transfer pump 20. Is sent to the refuse incineration plant via the transfer line 23. Further, the feed water is sent to the deaerator 12 provided in the gas turbine exhaust heat recovery boiler 6 by the deaerator feed water pump 19, heated by the low pressure steam generated in the low pressure evaporator 11 to be deaerated, and then the boiler. It is sent to the economizer 10 provided upstream of the low-pressure evaporator 11 in the gas flow direction by the water supply pump 18. The feed water is preheated by the economizer 10, and then enters the steam drum 9 of the evaporator 8 provided on the upstream side in the gas flow direction of the economizer 10.

On the other hand, the steam from a waste incinerator waste heat boiler (not shown), which is a waste heat recovery boiler, is sent to the superheater 7 of the gas turbine waste heat recovery boiler 6 via the first steam pipe 16. To be Further, the saturated steam generated by the evaporator 8 of the gas turbine exhaust heat recovery boiler 6 merges with the steam from the first steam pipe 16 from the steam drum 9 through the second steam pipe 17, and then enters the superheater 7. Sent.

The high-temperature steam from the superheater 7 is supplied to the steam turbine 24 via the common steam pipe 15a, and the steam turbine 24 drives the generator 25 to generate electric power. The steam from the steam turbine 24 is condensed in a condenser 26. The condensate is returned to the water supply tank 21, and a part of the condensate becomes water again by the deaerator water supply pump 19 and is supplied to the superheater 7 via the pipe 16. Further, a part of the condensate is sent to the refuse incineration plant from the pipe 23 by the transfer pump 20.

Thus, in this prior art, the two turbines 4, 24 and the generators 5, 25 are provided.

Another prior art is Japanese Patent Publication No. 1-31.
No. 012 publication. In this prior art, liquid phase water corresponding to the amount evaporated in the contact operation and transferred to the compressed air as a mixture with air is used as a cooling medium in the downstream of the intercooler of the compressor to reduce the compression power by the intermediate cooling. In order to achieve this without discharging heat to the outside of the cycle, the air used as the combustion-supporting gas, working medium gas, etc., or a gas mainly consisting of air is a part or all of the compressed air compressed by the compressor. Used as a heat recovery medium, brought into contact with superheated liquid phase water, through the air / steam mixture and the cooled liquid phase water, to recover the heat of the turbine exhaust with the air / steam mixture, and also to the cooled liquid In a gas turbine cycle in which phase water is used as a heat recovery medium for heat recovery of the turbine exhaust and intercooling of the compressor, this contact operation evaporates and becomes a mixture with air into compressed air. The liquid phase water that hits is used as the cooling medium in the downstream of the intercooler of the compressor by the cooled liquid phase water obtained by this contact operation, and is used for the contact operation and the heat recovery operation. Is configured for use.

Another prior art is Japanese Patent Publication No. 1-19053.
It is shown in the publication. This prior art is characterized by an operation of pre-cooling raw material air for forming a mixed phase mixture and a method of using the same, which means that a mixed phase mixture having a lower temperature than a simple mixture of compressed air and pressurized water is used. In order to enable the formation of a liquid, liquid phase water was injected into a part or all of the compressed air while compressing air or a gas mainly composed of air used as a combustion-supporting gas or working medium gas with a compressor. Heat recovery of turbine exhaust or heat recovery of turbine exhaust and intercooling of this compressor with a mixed phase mixture of compressed air / water / steam, which is a gas turbine cycle, and compressed air used for forming this mixed phase mixture is previously mixed with this mixed phase mixture. Is configured to cool in part.

In the prior arts disclosed in Japanese Patent Publication Nos. 1-31012 and 1-19053, the cooling water for the compressor intercooler of the gas turbine and the high-pressure air at the compressor outlet are directly mixed by a heat exchanger. Then, the high humidity air is injected into the combustor as a high temperature by exchanging heat with the exhaust gas from the gas turbine outlet, thereby forming a high efficiency gas turbine.

Still another prior art is Japanese Patent Publication No. 54-348.
No. 65 publication. In this prior art, high-temperature superheated steam is produced from the exhaust gas of a gas turbine, and this steam is injected into a gas turbine combustor to form a high-efficiency, high-output gas turbine as compared with a single-fluid operated gas turbine.

[0012]

In such a prior art, the amount of steam obtained by the waste heat boiler of a small to medium-sized incinerator of about 200 t / day is about 30 t / hour at the maximum, and the steam used in the refuse incineration plant is subtracted. And the steam that can be used for power generation is 20
Since the internal efficiency of the steam turbine is about t / hour, the internal efficiency of the steam turbine cannot be expected as much as it has a large capacity.

Further, FIG. 7 using a small amount of steam as described above.
Considering the system shown in Fig. 2, the system becomes a complex system consisting of a gas turbine and a steam turbine compared to the proportion of the power generation scale.
A high vacuum condenser of the mHgG class is required, and the area occupied by the waste incineration plant will be large.

Further, the above two working fluid gas turbine is
It uses only the steam generated by the gas turbine exhaust gas, does not use the low-temperature steam produced outside, and its flow rate changes like the steam sent from the waste incinerator waste heat boiler. It does not use steam.

It is therefore an object of the present invention to have a simple and compact construction which does not require a steam turbine and a steam turbine condenser and which uses externally produced medium and low temperature steam,
Like steam sent from a waste incinerator waste heat boiler,
It is an object of the present invention to provide a refuse power generation system that uses a dual working fluid gas turbine that can use steam whose flow rate fluctuates and has improved efficiency.

[0016]

SUMMARY OF THE INVENTION According to the present invention, steam is injected into a high pressure air in a compressor in a combustor, and the two fluids of the air and the steam are heated to a high temperature by burning a fuel, and a turbine section is A gas turbine exhaust heat recovery boiler that consists of a dual-working fluid gas turbine that drives the generator by passing it through, a superheater and an evaporator, and a gas turbine exhaust heat recovery boiler that recovers exhaust heat from this gas turbine. Steam line for supplying the steam of the above, a waste heat recovery boiler provided in the waste incineration plant, a second steam line for supplying the steam from the waste heat recovery boiler, and a first steam line A steam sent via the second steam line and a steam sent via the second steam line to be supplied to a superheater and a high temperature steam supply line for guiding the obtained high temperature steam to a combustor; Two working flows characterized by containing A dust generation system using a gas turbine. Further, according to the present invention, the gas turbine exhaust heat recovery boiler is arranged on the downstream side in the gas flow direction of the evaporator, and the economizer and the low-pressure evaporator are installed in this order from the upstream side in the supply water supply direction of the evaporator. It is characterized by including a container. Further, the present invention provides an auxiliary combustion device provided on the upstream side in the gas flow direction of the evaporator, an auxiliary combustion device fuel conduit for guiding fuel to the auxiliary combustion device, and a fuel flow rate interposed in the auxiliary combustion auxiliary device fuel pipe. And a flow rate detecting means for detecting the flow rate of the steam sent from the waste heat recovery boiler, which is provided in the first steam pipeline, and is responsive to the output from the flow rate detecting means. The fuel flow rate control valve is operated so that the injection amount of the steam injected into the combustor becomes a predetermined value, and control means for controlling the fuel supply flow rate is provided. Further, according to the present invention, a branch steam line provided by branching from the second steam line, a condenser provided on the downstream side of the branch steam line in the steam supply direction, and the branch steam line interposed. A branch steam line flow rate control valve, and a flow rate detecting unit provided in the first steam line for detecting the flow rate of steam sent from the waste heat recovery boiler.
In response to the output from the flow rate detecting means, the branch steam line flow rate control valve is operated so that the injection amount of the steam injected into the combustor reaches a predetermined value, and the branch steam line flow rate control valve sends the flow rate from the evaporator to the superheater. And a control means for controlling the flow rate of the generated steam. Further, the present invention provides a water supply pipe for supplying water from the economizer to the evaporator, a branch water supply pipe branched from the water supply pipe, and a decompression means interposed in the branch water supply pipe. The branch water supply pipe line is provided with a flasher connected downstream of the pressure reducing means in the supply direction of the water supply. Further, the present invention is a water supply pipe for supplying water from the economizer to the evaporator, a branch water supply pipe branched from the water supply pipe, a flasher connected to the branch water supply pipe, The steam supplied from the waste heat recovery boiler to the branch water supply pipe, the branch water supply pipe flow rate control valve interposed on the upstream side in the supply direction of the water supply of the flasher, and the first steam pipe. Flow rate detecting means for detecting the flow rate of the, and in response to the output of the flow rate detecting means, the branch water supply pipe flow rate control valve is operated so that the injection amount of the steam injected into the combustor becomes a predetermined value. And a control means for controlling the supply flow rate of the supply water supplied to the evaporator. Further, the present invention is arranged on the downstream side in the gas flow direction of the economizer or the evaporator, is provided on the upstream side in the supply direction of the feed water to the evaporator, and has a pressure lower than the pressure of the steam generated by the evaporator. Low-pressure evaporator for generating the steam, a water supply conduit for guiding the water supply from the low-pressure evaporator to the economizer, a water supply conduit flow control valve interposed in the water supply conduit, and the first steam A flow rate detecting means provided in the pipeline for detecting the flow rate of the steam sent from the waste heat recovery boiler, and an injection amount of the steam injected into the combustor in response to the output from the flow rate detecting means. And a control means for controlling the supply flow rate of the feed water guided to the economizer to operate the water supply pipe flow rate control valve so that the value becomes a predetermined value.

[0017]

According to the present invention, the two fluids of compressed air and steam are passed through the turbine portion of the two working fluid gas turbine to drive the generator while being heated to a high temperature by the combustion of fuel. Exhaust heat of the gas discharged from the turbine section is recovered by a gas turbine exhaust heat recovery boiler configured by a superheater and an evaporator, steam is generated by the evaporator, and the steam is generated via the second steam pipeline. The high-temperature steam supply pipe, which is sent to the superheater and is combined with the steam sent from the waste heat recovery steam generator installed in the waste incineration plant via the first steam pipe Is guided to the combustor by the compressed air and is injected into the air in the combustor as vapor that forms the two fluids. As a result, it is necessary to provide a steam turbine power generation facility that uses exhaust heat without wasting it and generate electricity using steam generated by a gas turbine exhaust heat recovery boiler, and a large-scale, low-pressure condensing facility under atmospheric pressure. Disappear.

Further, according to the invention, the gas turbine exhaust heat recovery boiler is arranged on the downstream side in the gas flow direction of the evaporator, and the economizer is provided in this order from the upstream side in the supply water supply direction of the evaporator. Includes vessel and condenser. As a result, the exhaust heat of the gas turbine can be recovered more efficiently.

Further, according to the invention, a fuel flow rate control valve is interposed in the fuel line for the auxiliary combustion device for guiding the fuel to the auxiliary combustion device provided on the upstream side in the gas flow direction of the evaporator. The valve is operated in response to the output from the flow rate detection means provided in the first steam pipeline, and the fuel supply flow rate is controlled by the control means so that the injection amount of steam into the combustor becomes a predetermined value. It With this, the flow rate of the fuel supplied to the auxiliary burner is adjusted according to the flow rate of the steam sent from the waste heat recovery boiler detected by the flow rate detecting means, and the upstream side of the gas flow direction of the evaporator is adjusted. The temperature of the gas can be raised, and the amount of steam generated by the evaporator can be adjusted. Therefore, the injection amount injected into the combustor can be made constant.

Further in accordance with the present invention, a branch steam line flow control valve is interposed in the branch steam line branching from the second steam line and guiding steam to the condenser. The control valve is operated in response to the output from the flow rate detecting means provided in the first steam pipeline, and is sent from the evaporator to the superheater so that the amount of steam injected into the combustor becomes a predetermined value. The flow rate of steam is controlled by the control means. Thereby, the steam generated by the evaporator can be released to the condenser according to the flow rate of the steam sent from the waste heat recovery boiler detected by the flow rate detecting means.
Therefore, the amount of steam injected to the combustor can be made constant.

Further in accordance with the present invention, a flasher is connected to the branch water supply pipe branching from the water supply pipe for supplying water from the economizer to the evaporator, and having the pressure reducing means interposed.
As a result, a part of the feed water supplied from the economizer to the evaporator can be transported to the flasher via the pressure reducing means. Therefore, steam or steam and saturated water can be sent to the refuse incineration plant and surrounding facilities.

Furthermore, according to the present invention, a branch water supply pipe flow control valve is interposed in the branch water supply pipe which is branched from the water supply pipe for supplying water from the economizer to the evaporator and which is connected to the flasher. The branch water supply pipe flow rate control valve is operated in response to the output from the flow rate detecting means provided in the first steam pipe, and vaporizes the steam so that the amount of steam injected into the combustor reaches a predetermined value. The supply flow rate of the feed water to the container is controlled by the control means. Thereby, a part of the feed water supplied from the economizer to the evaporator can be transported to the flasher according to the flow rate of the steam sent from the waste heat recovery boiler detected by the flow rate detecting means. . Therefore,
While keeping the amount of steam injected into the combustor constant,
Steam or steam and saturated water can be sent to the refuse incineration plant and surrounding facilities.

Further, according to the present invention, a low pressure evaporator is provided on the downstream side in the gas flow direction of the economizer or the evaporator, and on the upstream side in the supply direction of the feed water. A water supply pipeline flow control valve is interposed in the water supply pipeline that guides the water supply to the water supply pipeline, and the water supply pipeline flow control valve is responsive to the output from the flow rate detecting means provided in the first steam pipeline. The control means controls the supply flow rate of the feed water to the economizer so that it is operated and the amount of steam injected to the combustor becomes a predetermined value. Thereby, the supply flow rate of the feed water to be sent to the economizer or the evaporator is adjusted according to the flow rate of the steam sent from the waste heat recovery boiler detected by the flow rate detecting means, and is injected into the combustor. The low-pressure steam generated by the low-pressure evaporator can be supplied to, for example, a refuse incineration plant, peripheral facilities, a turbine intermediate stage of a gas turbine, and the like while maintaining a constant amount of injected steam.

[0024]

1 is a system diagram showing a refuse power generation system 51 using a dual working fluid gas turbine according to an embodiment of the present invention.

The air that has entered the gas turbine 1 is compressed by the compressor 2
Becomes high pressure air and enters the combustion chamber 3.

On the other hand, steam from a waste incinerator waste heat boiler (not shown), which is a waste heat recovery boiler, is sent to the superheater 7 of the gas turbine waste heat recovery boiler 6 via the first steam pipe 16. To be The saturated steam generated by the evaporator 8 of the gas turbine exhaust heat recovery boiler 6 is transferred to the steam drum 9
To the steam from the first steam line 16 through the second steam line 17 and enters the superheater 7. This steam is turned into high temperature steam by the superheater 7, and is injected into the combustor 3 via the high temperature steam supply pipe 15.

The fuel of the gas turbine is supplied to the combustor 3 by the fuel supply line 14 and burned, thereby giving heat to the high pressure air discharged from the compressor 2 and the steam injected through the high temperature steam supply line 15. The mixed gas, which is a dual working fluid of hot air and steam, passes through the turbine section 4 and drives the generator 5 to generate electricity. That is, the mixed gas works in the turbine unit 4, and the generated effective work is taken out from the generator 5 as electric power.

The mixed gas of air and steam that has exited the turbine 4 is transferred to the superheater 7, the evaporator 8, the economizer 10 and the low pressure evaporator 11 which are arranged in this order from the upstream side in the flow direction of the gas. It gives heat and becomes low temperature, and is discharged from the exhaust stack 13 to the atmosphere.

The supply water of the gas turbine exhaust heat recovery boiler 6 is stored in the water supply tank 21 as pure water suitable for water supply by the pure water device 22, and is stored by the transfer pump 20. It is sent to the refuse incineration plant via the pipeline 23. Further, the feed water is sent to the deaerator 12 provided in the gas turbine exhaust heat recovery boiler 6 by the deaerator feed water pump 19, heated by the low pressure steam generated in the low pressure evaporator 11 to be deaerated, and then the boiler. The water supply pump 18 sends the water to the economizer 10 provided upstream of the low-pressure evaporator 11 in the gas flow direction. The feed water is preheated by the economizer 10, and then enters the steam drum 9 of the evaporator 8 provided on the upstream side in the gas flow direction of the economizer. The steam generated by the evaporator 8 is sent to the superheater 7 and injected into the combustor 3 as described above.

As described above, in the refuse power generation system using the dual working fluid gas turbine of the present invention, the steam turbine 24,
The generator 25 and the condenser 26 are unnecessary, and the system has a simple structure.

Table 1 shows the examination results of a waste power generation system using the dual working fluid gas turbine of the present invention and a high-efficiency waste power generation according to the prior art, taking a waste incineration capacity of 150 tons / day as an example.

[0032]

[Table 1]

The upper half of Table 1 shows the quantity of the basic waste power generation system, such as capacity. In the lower half, this basic refuse power generation system is used in the present invention and the prior art (JP-A-5-1).
0107) and compare and show each ability.

The waste power generation system using the dual-working fluid gas turbine of the present invention has a simple structure, but has a thermal efficiency, a repowering effect, that is, a power generation output amount increased from the conventional waste power generation output with respect to the gas turbine input amount. Although the ratio is slightly lower than that of the prior art system, the generated power output is large and the thermal efficiency and the repowering effect have almost no difference when the power of auxiliary machinery such as a condenser fan is taken into consideration.

FIG. 2 is a diagram showing the amount of steam generated in the waste incineration waste heat boiler. The amount of steam generated in the incinerator waste heat boiler fluctuates as shown in Fig. 2 depending on the amount of heat generated by the input waste. Therefore, if this steam is directly injected into the combustor 3 of the gas turbine 1, the output of the generator 5 fluctuates by an amount commensurate with the fluctuation of the injection amount of the steam, and stable electric power cannot be obtained.

In order to eliminate this fluctuation in power generation output, there is a method in which only the steam in the valleys of the fluctuating amount of steam in FIG. 2 is guided to the gas turbine 1 and the steam forming the mountains is released. This cannot be said to fully utilize the generated steam.

FIG. 3 is a system diagram showing a refuse power generation system 52 using a dual working fluid gas turbine according to another embodiment of the present invention. The same reference numerals are given to the parts having the same configuration, and the description thereof will be omitted. In the refuse power generation system 52 using the dual working fluid gas turbine of the present embodiment, the condenser 28 is provided and the steam is sent from the steam drum 9 to the superheater 7.
In the steam line 17, the branch steam line 27 is connected to the second steam line 1
It is provided by branching from 7, and is connected to the condenser 28. The branch steam line 27 has a branch steam line flow control valve V.
A is provided. Further, a detector 40, which is a flow rate detecting means for detecting the flow rate of the steam, is provided in the first steam pipeline 16 for guiding the steam from the waste incinerator waste heat boiler, and in response to the output of the detector 40. , The branch steam line flow control valve V
A is configured to be controlled by the control means 41.

In the evaporator 8, a slightly larger amount of steam is generated than the fluctuation of the amount of steam generated in FIG. Detector 4
When the flow rate of the steam sent from the waste incinerator waste heat boiler detected by 0 corresponds to the above-mentioned mountain which is a predetermined value, the opening degree of the branch steam line flow rate control valve VA is increased to increase the evaporator. Most of the steam generated from 8 is sent to the condenser 28 via the branch steam line 27, that is, most of the steam is transported in the direction of arrow A, and a small amount is transported to the second steam line 17. However, when it corresponds to the valley, the opening degree of the branch steam pipe flow rate control valve VA is reduced and most of the generated steam is sent to the superheater 7 to release a small amount of steam in the arrow A direction. That is, by performing such an operation, a constant amount of steam is always injected into the combustor 3 of the gas turbine 1, and a constant power generation output can be obtained from the generator 5.

In the present embodiment, the escape steam from the steam drum 9 is released to the condenser 28 and returned to the water supply tank 21 as condensate, but as another embodiment of the present invention, the inside of the refuse incineration plant. It may be used for steam or air supply to surrounding facilities.

FIG. 4 is a system diagram showing a refuse power generation system 53 using a dual working fluid gas turbine according to another embodiment of the present invention. The same reference numerals are given to the parts having the same configuration, and the description thereof will be omitted.

A fuel branch pipe 29, which is a fuel pipe for an auxiliary combustion device, branched from a fuel supply pipe 14 for feeding fuel to the combustor 3 of the gas turbine 1 is provided, and the upstream side of the gas flow in the evaporator 8 is upstream. It is connected to an auxiliary combustion burner 30, which is an auxiliary combustion device provided in the.

Further, a fuel flow rate control valve V29 is interposed in the fuel branch pipeline 29, and the detector 4 provided in the pipeline 16 is provided.
In response to the output of 0, it is operated via the control means 41.

When the detector 40 detects that the flow rate of the steam from the waste incinerator waste heat boiler has decreased, the fuel flow rate control valve V29 is opened, fuel is sent to the auxiliary combustion burner 30, and the auxiliary combustion burner 30 operates. When operated, the gas temperature on the upstream side in the gas flow direction of the evaporator 8 is increased, the flow rate of steam from the steam drum 9 is increased, and the injection amount of steam to the combustor 3 of the gas turbine 1 is constant. Is controlled so that Thereby, the power generation output of the generator 5 is controlled to be constant.

FIG. 5 is a system diagram showing a refuse power generation system 54 using a dual working fluid gas turbine according to another embodiment of the present invention. The same reference numerals are given to the parts having the same configuration, and the description thereof will be omitted.

A flasher 32 is provided in the refuse power generation system 54 using the dual working fluid gas turbine of this embodiment. Further, a branch water supply pipe 36 is provided branching from a water supply pipe 44 for supplying water from the economizer to the evaporator, and is connected to the flasher. As a result, the superheater 7
It is configured to adjust the flow rate of steam to be sent to and to supply saturated steam and saturated water from the flasher to the customer.

The branch water supply pipe line 36 is provided with a pressure reducing orifice 31, which is a pressure reducing means, on the upstream side of the flasher 32 in the supply direction of the water.

In order to increase the amount of heat recovered from the exhaust gas of the gas turbine 1, that is, to reduce the temperature of the exhaust gas from the exhaust pipe 13 as much as possible, the economizer 10 is supplied with feed water in an amount more than that which can be evaporated by the evaporator 8. The surplus high-temperature water supplied to the evaporator 8 is led to the flasher through the pressure reducing orifice 31, leaving the required amount of water supplied to the evaporator 8. The internal pressure of the flasher 32 is kept at a predetermined pressure by an internal pressure adjusting valve 34 interposed in a pipe 32 for sending steam from the flasher 32. The high-temperature water guided to the flasher 32 is decompressed by the decompression orifice 31, and
It becomes a two-phase fluid of brackish liquid. Use this two-phase fluid with a flasher 3
Lead to 2 and separate into steam and water. The saturated steam and the saturated water are sent to the demand destinations such as a refuse incineration plant and peripheral facilities by a pipe 33 and a pipe 35, respectively.

Further, as another embodiment of the present invention, as shown in phantom lines in place of the decompression orifice 31, a branch water supply pipe flow rate control valve V36 is interposed in the branch water supply pipe, and the first steam pipe 16 is provided. Alternatively, the detector 40 as described above may be provided, and in response to the output from the detector 40, it may be controlled by the control means 41.

Thus, the amount of high-temperature water extracted from the outlet of the economizer 10 is made to correspond to the fluctuation of the flow rate of the steam sent from the waste incinerator waste heat boiler, so that the steam from the evaporator 8 is changed. Can be varied, and a constant amount of steam can be injected into the combustor 3 of the gas turbine 1 without being affected by fluctuations in the flow rate of steam sent from the waste incinerator waste heat boiler. That is, the flow rate of steam from the waste incineration waste heat boiler detected by the detector 40 is
When it corresponds to the mountain, the branch water supply pipe opening / closing valve V36
The branch water supply pipe so as to guide the water supply to the flasher, and when the water corresponds to the valley, the water supply that can generate the insufficient steam from the flow rate corresponding to the mountain is led to the evaporator 8. The road opening / closing valve V36 is operated to the closing side. As a result, saturated steam and saturated water from the flasher can be sent to demand destinations such as a refuse incineration plant and peripheral facilities while keeping the amount of steam injected to the combustor 3 constant. Therefore, a constant power generation output can be obtained.

FIG. 6 is a system diagram showing a refuse power generation system 55 using a dual working fluid gas turbine according to another embodiment of the present invention. The same reference numerals are given to the parts having the same configuration, and the description thereof will be omitted. In the refuse power generation system 55 using the dual working fluid gas turbine of the present embodiment, a second low pressure evaporator 37 and a low pressure economizer 39 are provided on the downstream side of the evaporator 8 in the gas flow direction. A part of the feed water supplied to the low-pressure economizer 39 is supplied to the second low-pressure evaporator 37, and the remaining feed water is supplied to the economizer 10 via the water supply pipe line 42.
The steam generated in the evaporator 37 is transported from the steam drum 38 to a demand destination such as a peripheral facility via the low pressure steam pipeline 43. Further, a water supply pipe flow rate control valve V42 is interposed in the water supply pipe 42, controls the water level of the steam drum 9, and is operated according to the output of the detector 40 provided in the first steam pipe 16. . When the flow rate of the steam sent from the waste incinerator waste heat boiler corresponds to the mountain, the water supply pipe flow rate control valve V42 is closed and the evaporator 8 is closed.
The amount of water supplied to the evaporator 8 is decreased, and when it corresponds to the valley, the water supply pipe flow rate control valve V42 is opened to increase the amount of water supplied to the evaporator 8. As a result, the amount of steam injected to the combustor 3 can be made constant. Therefore, a constant power generation output can be obtained.

The temperature of the exhaust gas on the downstream side in the gas flow direction of the evaporator 8 is related to the flow rate of the steam sent from the waste incinerator waste heat boiler, the gas turbine exhaust gas amount, and the steam injection amount to the gas turbine. Did not drop much, and as a result,
The exhaust gas temperature of the gas discharged from the exhaust stack 13 may be considerably high, the released gas energy may be large, and the discharge loss may increase. As in the present embodiment, the second low pressure evaporator 37 and the low pressure economizer 39 are provided on the downstream side of the evaporator 8 to recover the exhaust heat more efficiently, and generate steam from the steam drum 38 to the low pressure steam pipeline 43. The waste heat recovery efficiency can be improved by sending the waste heat to a demand destination such as a refuse incineration plant and peripheral facilities.

[0052]

According to the present invention, the steam generated by the exhaust heat recovered by the gas turbine exhaust heat recovery boiler is injected into the thermal burner together with the steam sent from the waste exhaust heat recovery boiler. Therefore, waste heat is not wasted and there is no need to install steam turbine power generation equipment and large-scale, low-pressure condensing equipment under atmospheric pressure. A waste power generation system with improved exhaust heat recovery efficiency can be obtained without the need.

Further, according to the present invention, the gas turbine exhaust heat recovery boiler is provided with a economizer and a low pressure evaporator,
Since the exhaust heat can be recovered more efficiently, the power can be generated more efficiently.

Further, according to the present invention, an auxiliary heat device is provided on the upstream side in the gas flow direction of the evaporator of the gas turbine exhaust heat recovery boiler, and the flow rate of steam sent from the waste exhaust heat recovery boiler is increased. It is possible to adjust the amount of steam generated in the evaporator of the gas turbine exhaust heat recovery boiler according to, regardless of the fluctuation of the flow rate of the steam sent from the waste exhaust heat recovery boiler, Since the amount of steam injected into the combustor can be made constant, exhaust heat can be used without waste, and a stable and constant power generation output can be obtained at all times.

Further, according to the present invention, there is provided a condenser for releasing the steam vaporized by the evaporator and condensing the steam.
Waste heat can be wasted because the amount of steam injected to the combustor can be made constant without condensing excess steam generated by the evaporator to waste heat. It is possible to always obtain a stable and constant power generation output.

Further, according to the present invention, the feed water whose amount is equal to or more than that required for the evaporator is introduced into the evaporator, and the surplus high-temperature water is introduced into the decompression means by the branch water supply pipe line to be decompressed and the steam liquid A phase fluid is created, and this brackish liquid two-phase fluid is separated into steam and saturated water by the flasher and can be sent to the refuse incineration plant and peripheral facilities, so that the amount of steam injected to the combustor is kept constant, It is possible to effectively use the recovered exhaust heat without wasting it while keeping the power generation output constant.

Further, according to the present invention, the feed water of which amount is equal to or more than the amount of water required for the evaporator is guided to the evaporator, and the surplus high-temperature water is supplied to the first steam pipe by the branch feed water pipe flow rate control valve. It is controlled and operated in response to the output of the detection means, is guided to the flasher by the branch water supply line, is separated into steam and saturated water by the flasher, and can be sent to the waste incineration plant and peripheral facilities. The amount of steam injected can be kept constant, and the exhaust heat recovered can be effectively used while keeping the power generation output constant.

Further, according to the present invention, a low pressure evaporator for generating a lower pressure steam than the evaporator is provided on the downstream side in the gas flow direction of the economizer or the evaporator, and the low pressure or medium pressure steam is generated. This steam is generated and can be supplied to the refuse incineration plant, peripheral facilities, and the middle stage of the turbine of the gas turbine, so the amount of steam injected into the combustor is kept constant and the power generation output is kept constant. The waste heat can be effectively used without wasting it.

[Brief description of drawings]

FIG. 1 is a system diagram showing a waste power generation system 51 using a dual working fluid gas turbine according to an embodiment of the present invention.

FIG. 2 is a diagram showing the amount of steam generated in a waste incinerator waste heat boiler.

FIG. 3 is a system diagram showing a refuse power generation system 52 using a dual working fluid gas turbine according to another embodiment of the present invention.

FIG. 4 is a system diagram showing a refuse power generation system 53 using a dual working fluid gas turbine according to another embodiment of the present invention.

FIG. 5 is a system diagram showing a refuse power generation system 54 using a dual working fluid gas turbine according to another embodiment of the present invention.

FIG. 6 is a system diagram showing a waste power generation system 55 using a dual working fluid gas turbine according to another embodiment of the present invention.

FIG. 7 is a system diagram showing a waste power generation system 50 using a prior art dual working fluid gas turbine.

[Explanation of symbols]

1 Gas Turbine 2 Gas Turbine Compressor 3 Gas Turbine Combustor 4 Gas Turbine Turbine 5 Gas Turbine Generator 6 Gas Turbine Exhaust Heat Recovery Boiler 7 Superheater 8 Evaporator 9 Steam Drum 10 Coal Saver 11, 37 Low Pressure Evaporator 12 Deaerator 13 Exhaust Cylinder 18 Boiler Water Supply Pump 19 Deaerator Water Supply Pump 20 Water Supply Transfer Pump 21 Water Tank 22 Pure Water Device 24 Steam Turbine 25 Steam Turbine Condenser 26 Low Pressure Condenser 28 Condenser 30 Auxiliary Burner 31 Decompression Orifice 32 Flasher 34 Pressure Control Valve 38 Low Pressure Steam Drum 39 Low Pressure Economizer 50 Conventional Power Generation System 51-55 Waste Power Generation System Using Two Working Fluid Gas Turbines VA Branch Steam Line Flow Control Valve V29 Fuel control valve V36 Branch water supply circuit Flow control valve V42 Water supply Pipe flow control valve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F22B 35/00 J 7526-3L F22D 1/02 7526-3L F22G 3/00 A H02K 7/18 Z

Claims (7)

[Claims] 1. A steam is injected into a high-pressure air in a compressor in a combustor, and the two fluids of the air and the steam are heated to a high temperature by fuel combustion and passed through a turbine section to drive a generator. (Ii) Working fluid gas turbine, a gas turbine exhaust heat recovery boiler that is composed of a superheater and an evaporator and recovers exhaust heat of this gas turbine; and a first steam that supplies steam from the gas turbine exhaust heat recovery boiler. Steam sent through the pipeline, the waste heat recovery steam generator installed in the waste incineration plant, the second steam pipeline that supplies steam from the waste heat recovery boiler, and the first steam pipeline And a high-temperature steam supply conduit for joining the steam sent through the second steam conduit and supplying the resulting high-temperature steam to the combustor. Using working fluid gas turbine Look at the power generation system. 2. The gas turbine exhaust heat recovery boiler comprises:
2. The economizer according to claim 1, further comprising a economizer and a low-pressure evaporator, which are arranged on a downstream side in a gas flow direction of the evaporator and are provided in this order from an upstream side in a supply direction of the feed water of the evaporator. A waste power generation system using a working fluid gas turbine. 3. An auxiliary combustion device provided on the upstream side in the gas flow direction of the evaporator, an auxiliary combustion device fuel conduit for guiding the fuel to the auxiliary combustion device, and a fuel flow rate interposed in the auxiliary combustion device fuel conduit. A fuel flow rate control valve for adjusting the flow rate, flow rate detecting means provided in the first steam pipeline for detecting the flow rate of steam sent from the waste heat recovery boiler, and responding to the output from the flow rate detecting means. And a control means for operating the fuel flow rate control valve and controlling the fuel supply flow rate so that the injection amount of the steam injected into the combustor becomes a predetermined value. 1 or 2
A waste power generation system using the dual-working fluid gas turbine according to 1. 4. A branch steam pipeline provided branching from the second steam pipeline, a condenser provided downstream of the branch steam pipeline in a steam supply direction, and a condenser provided in the branch steam pipeline. Branch steam line flow control valve, and a flow rate detection unit provided in the first steam line for detecting the flow rate of steam sent from the waste heat recovery boiler, and responding to the output from this flow rate detection unit. Control means for operating the branch steam line flow rate control valve so that the amount of steam injected into the combustor becomes a predetermined value, and controlling the flow rate of steam sent from the evaporator to the superheater. The waste power generation system using the dual working fluid gas turbine according to claim 1 or 2, further comprising: 5. A water supply pipe for supplying water from the economizer to the evaporator, a branch water supply pipe branched from the water supply pipe, and a decompression means interposed in the branch water supply pipe. The refuse power generation system using a dual-working fluid gas turbine according to claim 2, further comprising: a flasher connected to the branch water supply pipe line at a downstream side of the pressure reducing means in the supply water supply direction. 6. A water supply conduit for supplying water from the economizer to the evaporator, a branch water supply conduit branched from the water supply conduit, and a flasher connected to the branch water supply conduit. The branch water supply pipe flow rate control valve interposed in the branch water supply pipe on the upstream side in the supply direction of the flusher, and the steam provided from the waste heat recovery steam generator, which is provided in the first steam pipe. Flow rate detecting means for detecting the flow rate of the branch feed water pipe flow rate control valve so that the injection amount of the steam injected into the combustor becomes a predetermined value in response to the output of the flow rate detecting means. And a control means for controlling the supply flow rate of the supply water supplied to the evaporator, the waste power generation system using the dual working fluid gas turbine according to claim 2. 7. A lower pressure than the pressure of the steam generated by the evaporator, which is arranged on the downstream side in the gas flow direction of the economizer or the evaporator and is provided on the upstream side in the direction of supplying water to the evaporator. Low-pressure evaporator for generating the steam of, a water supply conduit for guiding the water supply from the low-pressure evaporator to the economizer, a water supply conduit flow control valve interposed in the water supply conduit, the first steam A flow rate detecting means provided in the pipeline for detecting the flow rate of the steam sent from the waste heat recovery boiler, and the injection amount of the steam injected into the combustor in response to the output from the flow rate detecting means. 3. The control means for operating the water supply pipe flow rate control valve so as to become a predetermined value, and controlling the supply flow rate of the feed water introduced to the economizer. A waste power generation system using a working fluid gas turbine.