JPH10141012A - Refuse incineration generating plant having independent heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize fuel and to achieve the increase of efficiency, in a refuse generating plant having an independent heater using external fuel serving as a heat source. SOLUTION: An independent heater 04 using external fuel serving as a heat source is provided. The independent heater 04 comprises a superheating part 05 to superheat steam to superheat steam fed to a steam turbine 06 from a waste heat boiler 02; and a hot water absorbing part 07 by which a whole amount or a part of condensate of a steam turbine 02 is caused to produce hot water through heat-exchange with exhaust gas discharged from the superheating part 05. Further, the independent heater is provided with a flasher 13 to introduce hot water flowing out from the hot water absorbing part 07. Steam generated at the flasher 13 is mixed in the steam turbine 06 and drain of the flasher 13 is guided as feed water to the waste heat boiler 02.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste incinerator, a waste heat boiler for recovering waste heat of the waste incinerator, a steam turbine operated by steam from the waste heat boiler, and an independent heat source using an external fuel as a heat source. The present invention relates to a refuse incineration power plant having a heater.

[0002]

2. Description of the Related Art In a conventional refuse incineration power plant, when steam from a waste heat boiler is superheated by an independent heater using an external fuel such as city gas as a heat source, the exhaust gas from the independent heater is directly discharged to the atmosphere. I was FIG. 5 shows a system diagram of a refuse incineration power plant using the conventional technology. In FIG. 5, the exhaust gas discharged from the refuse incinerator 01 is heat-recovered by the waste heat boiler 02, and the generated steam is led to the superheater 05 of the independent heater 04 via the main steam line 03, and the temperature of the steam is raised. This is led to the steam turbine 06. On the other hand, water is supplied to the waste heat boiler 02 via the water supply pump 12.

[0003] Incidentally, FIG. 6 shows a separate heater 04 inside the fluid temperature conditions, the combustion gas temperature with superheated portion 05 by reducing the G ₁ to G _2, the temperature of the vapor lines S ₁ It rises from to S _2. However, the exhaust gas temperature G ₂ did not fall below the steam temperature S ₂ and was released to the atmosphere as it was.

[0004]

As described above, conventionally, the temperature of the combustion gas discharged from the independent heater 04 is 3
The temperature is about 00 ° C to 350 ° C, and effective use of heat has been desired. An object of the present invention is to achieve high efficiency by effectively using fuel in a refuse incineration power plant having an independent heater using an external fuel as a heat source.

[0005]

A refuse incineration power plant according to the present invention, which is provided to solve the above problems, comprises a refuse incinerator, a waste heat boiler for recovering waste heat of the refuse incinerator, and a waste heat boiler. A steam turbine operated with steam, and an independent heater using external fuel as a heat source, the independent heater includes:
Hot water that heats steam supplied from the waste heat boiler to the steam turbine by heat exchange between the superheated portion and the exhaust gas that has exited the superheated portion of the condensate from the steam turbine. And an absorbing portion.

The refuse incineration power plant according to the present invention further has a flasher for introducing hot water flowing out of the hot water absorbing section, and mixes steam generated by the flasher into the steam turbine, and drains the steam from the flash turbine. Is configured to be guided as water supply to the waste heat boiler.

In the thus constructed refuse incineration power plant of the present invention, the steam from the waste heat boiler is superheated in the superheated section by burning the external fuel by the independent heater and then exits the superheated section. Exhaust gas is converted into hot water by heating at least a portion of the condensate of the steam turbine in its hot water absorbing section.

[0008] The hot water is introduced into a flasher, the generated steam is mixed into a steam turbine, and the drain is supplied as water for a waste heat boiler. Therefore, conventionally, the steam from the waste heat boiler was released only by overheating with an independent heater.
The heat of the exhaust gas at 00 ° C to 350 ° C is recovered and effectively used in the refuse incineration power plant.

Further, in the refuse incineration power plant according to the present invention, in addition to the above-described configuration, the steam generated by the flasher and mixed into the steam turbine is heated between the superheating section and the hot water absorption section of the independent heater. It is desirable to adopt a configuration in which a reheating section is provided. With this configuration, in addition to the above-described heat recovery in the superheated portion and the hot water absorption portion, in this reheat portion, heat recovery by steam guided from the flasher to the steam turbine is performed, and the heat efficiency can be further increased. it can.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a waste incineration power plant according to the present invention will be specifically described with reference to the embodiments shown in FIGS. In the following embodiments, the same components as those of the conventional apparatus shown in FIGS. 5 and 6 are denoted by the same reference numerals for simplification of description, and redundant description thereof will be omitted. .

(First Embodiment) First, a waste incineration power plant according to a first embodiment will be described with reference to FIGS. In FIG. 1, an independent heater 04 using an external fuel as a heat source has a hot water absorbing section 07 downstream of the superheat section 05. 08 is a condensing equipment, 09 is a generator, 10 is a bleed steam line, and 11 is a condensing pump.

Reference numeral 13 denotes a flasher which generates steam from the hot water that has exited the hot water absorbing unit 07. The steam is steam line 14
Is mixed into the steam turbine 06, and the drain is sent to the injector 16 by the drain pump 15.

In the refuse incineration power plant of FIG. 1 having such a configuration, the exhaust gas from the refuse incinerator 01 is recovered by the waste heat boiler 02 and then guided to the downstream system. On the other hand, the steam generated from the waste heat boiler 02 is guided to the superheating section 05 of the independent heater 04 via the steam pipe 03 and is superheated, and then guided to the condensate facility 08 via the steam turbine 06.

The condensed condensate is condensed by a condensate pump, and the condensate is partially or completely condensed again into the hot water absorbing portion 0 of the independent heater 04.
After heating to 7, the flasher 13 separates into steam and drain. The steam generated by the flasher 13 is guided to a steam turbine 06 via a pipe 14 and contributes to power generation. After the drain of the flasher 13 is pressurized by the drain pump 15, the drain is returned to the condensate system through the injector 16, and supplied to the waste heat boiler 02 via other water supply equipment including the water supply pump 12.

FIG. 2 explains the fluid temperature in the independent heater 04 described above. The vertical axis indicates temperature, and the horizontal axis indicates sites. That is, part A of FIG. 2 shows the temperature state of the fluid in the superheater 05, and part B shows the temperature state of the fluid in the hot water absorber 07. Incidentally, G ₁ represents an inlet gas temperature of the superheater 05.

S ₁ indicates the temperature of the steam 03 from the waste heat boiler 02, and the steam superheated in the superheating section 05 becomes the temperature S ₂ and is guided to the steam turbine 06. On the other hand, when heat is transferred by the heat exchanger, a heat transfer limit occurs structurally (pinch point ΔS), and therefore, the gas side temperature G ₂ is determined by the steam temperature S ₂ + ΔS.

[0017] Thus those heat exchangers only superheating portion 05 into separate heater 04 is provided is the gas temperature G ₂ is directly discharged to the atmosphere. Therefore the exhaust gas by providing the hot water absorber 07 to equalize the economizer and structure downstream of the heating unit 05 will be further heat recovery to G _3.

Meanwhile, condensate hot water absorber at S ₃ temperature after mixed with a flasher drain at the injector 16 0
Led to 7, a hot water temperature of the S _4. In addition, hot water absorption part 0
By increasing the heat transfer area of 7, it is physically possible to lower the exhaust gas temperature G ₃ to the temperature of S ₃ + ΔS.

Second Embodiment Next, a waste incineration power plant according to a second embodiment will be described with reference to FIGS. In the refuse incineration power plant shown in FIG. 3, the reheating unit 17 is provided between the superheating unit 05 and the hot water absorption unit 07 in the independent heater 04. The reheating unit 17 is configured to heat steam generated by a flasher and mixed into the steam turbine 06. Other configurations are the same as those of the power plant shown in FIG.

FIG. 4 is a drawing corresponding to FIG. 2 showing the state of the fluid temperature in the independent heater 04 of the refuse incineration power plant shown in FIG. In FIG. 4, the vertical axis indicates temperature,
The horizontal axis indicates the site. That is, part A shows the temperature state of the fluid in the superheating unit 05, part C shows the temperature state of the fluid in the reheating unit 17, and part B shows the temperature state of the fluid in the hot water absorbing unit 07.

As in FIG. 2, G ₁ indicates the gas temperature at the inlet of the superheater 05. S ₁ denotes a steam 03 temperature from the waste heat boiler 02, superheated steam is led to the steam turbine 06 becomes the temperature S _2. In the external heater 04 of the refuse incineration power plant shown in FIG. 4, the exhaust gas is further heated to the temperature G ₄ by providing a reheating unit 17 and a hot water absorption unit 07 having the same structure as that of the economizer in the downstream side of the superheating unit 05. Through hot water absorption part 07
It will be heat recovery to a temperature G ₃ outlet.

On the other hand, the condensed water is introduced into the hot water absorbing section 07 at the temperature S ₃ after being mixed with the flasher drain from the flasher 13 by the injector 16, and has the hot water temperature of S ₄ . On the other hand, the steam generated in the flasher 13 passes through the reheating unit 17 and changes from the saturation temperature S ₄ to the superheating temperature S _5.
Get. This steam is passed through a pipe 14 to a steam turbine 06.
, High-efficiency power generation becomes possible by the reheating effect.

[0023]

In the refuse incineration power plant according to the present invention, in addition to the superheated section, a hot water absorption section similar to a economizer is added to the independent heater using the external fuel as a heat source, and the exhaust heat of the external fuel combustion gas is removed. It is possible to improve plant efficiency by recovering the water to the limit, separating hot water from the hot water absorption section into steam and drain with a flasher, and using the steam for power generation.

In addition, in addition to the above, in the case where a reheating section for heating the steam from the flasher is provided in the independent heater, the plant efficiency is further increased by reheating the steam from the flasher and using it for power generation. It is possible to improve.

[Brief description of the drawings]

FIG. 1 is a system diagram of a refuse incineration power plant according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a fluid temperature state inside an independent heater used in the refuse incineration power plant of FIG.

FIG. 3 is a system diagram of a refuse incineration power plant according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a fluid temperature state inside an independent heater used in the refuse incineration power plant of FIG. 3;

FIG. 5 is a system diagram of a conventional refuse incineration power plant.

FIG. 6 is an explanatory diagram showing a fluid temperature state inside an independent heater used in the refuse incineration power plant of FIG.

[Explanation of symbols]

Reference Signs List 01 Waste incinerator 02 Waste heat boiler 03 Main steam line 04 Independent heater 05 Superheated part 06 Steam turbine 07 Hot water absorption part 08 Condensation equipment 09 Generator 10 Extracted steam line 11 Condensate pump 12 Feed water pump 13 Flasher 14 Steam line 15 Drain pump 16 Injector 17 Reheating section G ₁ Independent heater gas inlet temperature G ₂ Independent heater gas outlet temperature S ₁ Superheated section steam inlet temperature S ₂ Superheated section steam outlet temperature G ₃ Hot water absorbing section gas outlet temperature G ₄ Reheat section outlet gas temperature ΔS pinch point S ₃ Hot water absorption section feedwater inlet temperature S ₄ Hot water absorption section hot water exit temperature S ₅ Reheat section exit steam temperature

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akiko Yamagishi 12 Nishikicho, Naka-ku, Yokohama-shi Yokohama Heavy Industries, Ltd.

Claims (2)

[Claims] A waste incinerator, a waste heat boiler for recovering waste heat of the waste incinerator, a steam turbine operated by steam from the waste heat boiler, and an independent heater using external fuel as a heat source The independent heater is configured to exchange heat between a superheater that superheats steam supplied from the waste heat boiler to the steam turbine and exhaust gas that has exited the superheater from the entire or a part of the condensate of the steam turbine. Having a hot water absorbing section to make hot water, and having a flasher for introducing hot water that has exited the hot water absorbing section, mixing the steam generated by the flasher into the steam turbine, A refuse incineration power plant having an independent heater, wherein the drain of the flasher is configured to be guided as feed water for the waste heat boiler. 2. A reheating section for heating steam generated by the flasher and mixed into the steam turbine, between the superheating section and the hot water absorbing section of the independent heater.
A refuse incineration power plant having the independent heater as described.