JPH0835629A - Garbage incineration plant - Google Patents

Abstract

(57) [Summary] [Objective] To provide a highly economical waste incineration plant capable of efficiently exchanging heat while reducing the facility cost for attaching a superheater to the waste incineration plant. [Structure] A pair of stoker-type refuse incinerators in which a flue 8 for secondary combustion is formed in a space above the incineration zone 13 and a waste heat boiler 9 is provided downstream of the flue 8 1 are provided in parallel, and a superheater 2 that superheats the steam generated in the waste heat boiler 9 and a power generator 3 that supplies the superheated steam to generate electric power are provided. It is composed of a counter flow heat exchanger composed of a heat supply side fluid flow path 2b flowing from below to above and a heat reception side fluid flow path 2c from which heat receiving side fluid flows from above to below, and the pair of the refuse incinerators 1 Installed in the lower space between the heat supply side fluid flow path 2b and the gas flow path 6a that guides the gas that has passed through the heat supply side fluid flow path 2b to the flue 8; A steam flow path 7b leading to the turbine is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of stoker-type gas turbines having a flue for secondary combustion formed in a space above an incineration zone and a waste heat boiler provided downstream of the flue. The waste incinerators are installed side by side, and a superheater that superheats the steam generated in the waste heat boiler, and a power generation device that supplies the steam superheated in the superheater to generate electric power are constructed. Regarding incineration plant.

[0002]

2. Description of the Related Art In recent years, in particular, a garbage power generation system for generating electric power by effectively utilizing heat generated in a garbage incinerator has attracted attention. In order to avoid high temperature corrosion of heat exchange parts such as heat transfer tubes, it is not possible to superheat the steam generated by the waste heat boiler to a high temperature.Therefore, combustion-type overheating using city gas or propane gas as the supply fuel A waste incineration plant has been proposed in which a furnace is installed outside the incinerator to superheat steam from a waste heat boiler to improve power generation efficiency.

[0003]

However, since the superheater used in such a waste incineration plant becomes quite large, it is necessary to attach it to an existing waste incineration plant or to construct a new waste incineration plant. It is necessary to secure a considerable site, and in order to realize a mechanism that guides the heating fluid of the superheater to the flue of the refuse incinerator to promote secondary combustion, There was a risk that various equipment costs would be increased, such as the necessity of providing a large blower fan in order to lead to the flue located in the upper space. Further, if such a heat fluid is conveyed by providing a long conveyance path, the heat exchange efficiency in the superheater is also reduced.

An object of the present invention is to provide a highly economical waste incineration plant capable of contributing to highly efficient power generation by reducing the facility cost for attaching a superheater to the waste incineration plant.

[0005]

To achieve this object, a characteristic structure of a refuse incineration plant according to the present invention is that a superheater is provided with a heat-supply-side fluid flow path in which a heat-supply-side fluid flows from a lower side to an upper side, and a heat-receiving side. The heat-supply-side fluid flow path is constituted by a counter-flow heat exchanger consisting of a heat-reception-side fluid flow path in which a side fluid flows downward from above, and is installed in a lower space between the pair of refuse incinerators. There is provided a gas flow path that guides the gas that has passed through to the flue and a steam flow path that guides the steam from the heat receiving side fluid flow path to the steam turbine for power generation.

[0006]

In general, a refuse incineration plant is constructed by arranging a pair or a plurality of refuse incinerators in parallel in consideration of operation during maintenance. In the upper space between the garbage incinerators,
A soot blower mechanism for cleaning the heat exchange section of the waste heat boiler is provided, but the space below it is unnecessarily opened. On the other hand, the power generator is installed on the floor near the ground for easy maintenance.

Therefore, by installing the superheater in the lower space between the pair of refuse incinerators, the dead space originally required is effectively utilized, and it is not necessary to secure a separate installation space. You can

Further, if the counter-flow heat exchanger is constituted by the heat-supply-side fluid flow path in which the heat-supply-side fluid flows upward from below and the heat-reception-side fluid flow path in which the heat-reception-side fluid flows downward from above, The heat-receiving side fluid, which is steam generated in the waste heat boiler installed at the upper part of the refuse incinerator, can be supplied to the power generator installed on the first floor without providing a long transfer path, and the heat-supplying side fluid can be supplied. The high temperature gas can be supplied to the flue formed in the upper part of the refuse incinerator without providing a long transportation path. Therefore, the gas passage that guides the gas that has passed through the heat supply side fluid passage to the flue and the steam passage that leads the steam from the heat receiving side fluid passage to the steam turbine for power generation have an extremely short length. Therefore, heat loss can be minimized and efficient heat exchange can be performed.

[0009]

As described above, according to the present invention, it is possible to reduce the facility cost for attaching a superheater to a refuse incineration plant and to enable efficient heat exchange to contribute to highly efficient power generation. It is now possible to provide a waste incineration plant that is rich in nature.

[0010]

EXAMPLES Examples will be described below. As shown in FIGS. 1 and 2, the waste incineration plant has a flue 8 for secondary combustion formed in the space above the incineration zone 13 and a waste heat boiler 9 provided downstream of the flue 8. A pair of stoker-type waste incinerators 1 that are configured are arranged in parallel so that the incineration zone 13 has a parallel posture, and a superheater 2 that superheats the steam generated in the waste heat boiler 9, and A power generator 3 for supplying electric power by supplying steam superheated by the superheater 2 is provided.

The pair of refuse incinerators 1 is shown in FIGS.
As shown in, the hopper 11 is loaded with the crane mechanism 10a from the garbage pit 10 that stores the municipal waste collected by the garbage truck, and the lower part of the hopper 11 is provided with the dust supply device 12 as shown in FIG. Drying zone 13 for drying the pushed dust while conveying it with a stoker mechanism
a, combustion zone 13b for combustion treatment, post-combustion zone 13 for ashing
An incineration zone 13 composed of c and an ash treatment device 14 for melting generated ash are provided, and heat recovery is provided downstream of the flue 8 for secondary combustion formed in the space above the combustion zone 13b. An electric precipitator 15 and a bag filter 1 are provided as an exhaust gas treatment device that is provided with a waste heat boiler 9 and further removes dust and harmful gas from the exhaust gas that has passed through the waste heat boiler 9.
6, a smoke washing device 17 and the like are provided.

The waste heat boiler 9 is disposed on the 4th to 5th floors above the ground, and in the side thereof, that is, in the upper space between the pair of refuse incinerators, for cleaning the heat exchange part of the waste heat boiler 9. The soot blower mechanism 5 is provided to periodically blow a gas onto the heat exchange section to remove adhered dust and the like.

As shown in FIGS. 1 and 2, the superheater 2
Is a combustion type superheater that uses city gas as a fuel, and is provided below the soot blower mechanism 5, and the heat supply side fluid, which is the high temperature combustion gas burned by the burner 2a, flows upward from below. The counterflow heat exchanger is composed of a flow path 2b and a heat-receiving-side fluid flow path 2c in which a heat-receiving-side fluid that is steam generated in the waste heat boiler 9 flows downward from above.

A portion of the high-temperature, clean combustion gas that has passed through the heat-supply-side fluid flow path 2b passes through a gas flow path 6a that leads to the inlet of the flue 8 and smoke from both incinerators 1 Way 8
The air and exhaust gas in the flue 8 are superheated and agitated to promote complete combustion, and the rest is sent to both of the electrostatic precipitators 15 through the gas flow path for exhaust gas treatment. Further, the steam generated in the pair of waste heat boilers 9 is guided to the heat receiving side fluid passage 2c via the steam passage 7a, and the steam from the heat receiving side fluid passage 2c flows through the steam passage 7b. It is guided to the steam turbine 3a for power generation installed on the first floor via the power supply and used for power generation.

Since the exhaust gas of the refuse incinerator 1 contains corrosive gases such as chlorides and sulfides, the waste gas is 800 to 950 ° C. from the viewpoint of high temperature corrosion prevention, but the waste gas is not used. About 300 steam is generated in the heat boiler 9.
Can only overheat to around ℃.

Therefore, the superheater 2 is connected to the waste incinerator 1
When the steam generated in the waste heat boiler 9 is superheated to, for example, about 100 kgf / cm ² and 500 ° C. and supplied to the steam turbine 3 a, power generation driven by the steam turbine 3 a Electric power is generated by the machine 3b.
That is, the steam turbine 3a and the generator 3b constitute the power generator 3.

Another embodiment will be described below. The superheater is not limited to the combustion type superheater, but in addition, a superheater that superheats steam by supplying exhaust gas of the gas turbine as a combined cycle provided with a gas turbine that drives a generator May be

As shown in FIG. 3, the ash processing apparatus 14 for melting and processing the ash generated in the refuse incinerator 1 is not particularly required and is optional. Further, the number of the refuse incinerators 1 constituting the refuse incineration plant is not limited to two and may be a plurality of two or more.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is a schematic front view of a refuse incineration plant.

[Figure 2] Cross-sectional view of the main part of a refuse incineration plant

FIG. 3 is a schematic sectional view of a refuse incinerator.

FIG. 4 is a schematic plan view of a refuse incinerator.

[Explanation of symbols]

 1 garbage incinerator 2 superheater 2b heat supply side fluid flow path 2c heat receiving side fluid flow path 3 power generator 6a gas flow path 7b vapor flow path 8 flue 13 incineration zone

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F23G 5/46 ZAB A (72) Inventor Hiroaki Nikaido 1-1-1 Hama, Amagasaki, Hyogo Co., Ltd. Kubota Technology Development Laboratory

Claims (1)

[Claims] 1. A flue (8) for secondary combustion is formed in a space above an incineration zone (13), and a waste heat boiler (9) is provided downstream of the flue (8). A pair of stoker-type waste incinerators (1) are installed side by side, and the waste heat boiler (9) is installed.
A waste incineration plant comprising a superheater (2) that superheats the steam generated in 1. and a power generation device (3) that supplies the steam superheated by the superheater (2) to generate electricity. Then, the superheater (2) is provided with a heat-supply-side fluid flow path (2b) in which the heat-supply-side fluid flows upward from below and a heat-reception-side fluid flow path (2c) in which the heat-reception-side fluid flows downward from above. And a gas that has passed through the heat-supply-side fluid flow path (2b) is installed in the lower space between the pair of refuse incinerators (1). A waste incineration plant provided with a gas flow path (6a) leading to 8) and a steam flow path (7b) leading the steam from the heat receiving side fluid flow path (2c) to a steam turbine for power generation.