JP2771724B2 - Urban waste incineration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a waste heat recovery boiler for exhaust gas from an incinerator provided with a secondary combustion auxiliary gas supply section, and supplies steam generated from the waste heat recovery boiler to a power generation steam turbine. A municipal garbage incinerator provided with a steam supply path for supplying and a combustion type superheater for raising the temperature of the steam in the steam supply path, specifically, the steam generated from the waste heat recovery boiler has a temperature of Low, therefore, if it is used as it is as the power source of the power generation steam turbine, the power generation efficiency is poor, so it is overheated to obtain a higher temperature superheated steam, which is then used as the power source of the power generation steam turbine. Supply to increase power generation efficiency,
The present invention relates to an incinerator for municipal waste provided with the combustion type superheater.

[0002]

2. Description of the Related Art Conventionally, this kind of municipal garbage incinerator uses the ambient temperature air as it is as secondary air to be supplied to the incinerator, and discharges the combustion exhaust gas from the combustion type superheater as it is to the atmosphere. It has been proposed to adopt such a configuration.

[0003]

However, the municipal garbage to be put into the incinerator is a mixture of easily combustible and hard-to-burn garbage, for example, from dry wood chips and paper to moist kitchen garbage. In addition, the amount of municipal waste to be treated per unit time also varies, and it is inevitable that the combustion temperature will vary considerably. Since the temperature of the secondary combustion air is low, if the secondary combustion air is supplied into the incinerator, the temperature of the exhaust gas to be subjected to secondary combustion tends to be too low, so that the complete combustion state can be stabilized. There was a problem that it was not easy to maintain. If a stable complete combustion state cannot be maintained, the generation of dioxin and carbon monoxide is difficult to suppress, and dust is likely to be generated. Therefore, stable complete combustion has been desired from the viewpoint of pollution control. Therefore, an object of the present invention is to provide a municipal garbage incineration apparatus that can maintain a stable complete combustion state and has high thermal efficiency.

[0004]

A first characteristic configuration of the municipal garbage incinerator according to the present invention for achieving this object is as follows.
A waste heat recovery boiler for exhaust gas from an incinerator having a secondary combustion auxiliary combustion gas supply unit; a steam supply path for supplying steam generated from the waste heat recovery boiler to a power generation steam turbine; the combustion superheater for raising the temperature of the vapor in the road provided, wherein the combustion exhaust gas from the combustion type superheater, said secondary combustion combustion support leads to the gas supply unit secondary combustion gas supplying passage and, for drying A drying gas supply path leading to the gas supply section and a primary combustion gas supply path leading to the primary combustion auxiliary combustion gas supply section are provided .

[0005]

If a secondary combustion gas supply path for guiding the combustion exhaust gas from the combustion type superheater to the secondary combustion auxiliary gas supply section is provided, the secondary exhaust gas is supplied through the secondary combustion gas supply path. Since a high-temperature combustion exhaust gas from the combustion type superheater can be supplied as a secondary combustion gas into the incinerator from the combustion auxiliary combustion gas supply unit, it is possible to prevent the combustion temperature from dropping too much, and to stabilize. The maintained complete combustion state can be maintained . Further, a drying gas supply path for guiding the combustion exhaust gas from the combustion type superheater to the drying gas supply unit and a primary combustion gas supply path for guiding the combustion exhaust gas to the primary combustion auxiliary combustion gas supply unit are provided. Then, a high-temperature drying gas and a primary combustion gas having a high oxygen concentration can be supplied into the incinerator through the drying gas supply path and the primary combustion gas supply path. as a result,
Even if the municipal garbage to be treated is sufficiently dried with a drying gas, it can be burned, so that a stable combustion state can be easily obtained, and furthermore, the supplied combustion gas itself. Is already at a high temperature, the temperature of the object to be treated is quickly increased, gasification is promoted, and the combustion efficiency is further improved.

[0006]

As a result, the combustion exhaust gas from the combustion type superheater, which has been directly discharged into the atmosphere, can be effectively used to maintain a complete combustion state and to achieve a high thermal efficiency incinerator for municipal garbage. Could be provided. With this configuration, generation of unburned gas can be prevented, so that generation of carbon monoxide and dioxin can be suppressed. or,
The amount of generated dust is also reduced.

[0007]

Next, an embodiment of the municipal garbage incinerator according to the present invention will be described with reference to the drawings. As shown in FIG.
A stoker-type incinerator 1 that incinerates 50 t / d of municipal waste, and 11.4 × 10 ⁴ N generated from the incinerator 1.
an exhaust gas treatment device 2 for treating exhaust gas of m ³ / h, and
The municipal garbage incineration device is configured by the power generation device 3 that generates power using the heat of the exhaust gas. The incinerator 1 comprises a receiving hopper 4 for receiving an object to be treated as municipal waste.
And a stoker for conveying the object to be processed received from the receiving hopper 4 is disposed in the furnace main body.
A burner 5 for assisting and igniting is provided on the wall surface on the side opposite to the side provided with. The workpieces received from the receiving hopper 4 are sequentially transferred, and are burned while being dried. In order to complete the combustion of the unburned gas, a secondary combustion space 7 is formed in the upper space at 400 ° C.
A secondary combustion auxiliary gas supply unit 9 for supplying a gas of 2.0 × 10 ⁴ Nm ³ / h is provided facing the secondary combustion space 7, and on the downstream side of the secondary combustion space 7, A waste heat recovery boiler 6 that forms a waste heat recovery boiler accommodating space 8 and recovers a part of the amount of heat of the combustion exhaust gas is provided. The exhaust gas treatment device 2 is provided with a flue gas passage 10 whose exhaust gas inlet is opened on the downstream side of the waste heat recovery boiler accommodating space 8, and in the middle of a flow path leading to a chimney 11 of the flue gas passage 10. , Bag filter 12, smoke washing device 13,
It is configured by connecting a white smoke prevention device 14. The power generator 3 includes a power generating steam turbine 17 including a high-pressure turbine 15 and a low-pressure turbine 16, a generator 18 driven by the power-generating steam turbine 17, and 3 generated from the waste heat recovery boiler 6.
A steam supply path 19 for supplying steam at 10 ° C. to the high-pressure turbine 15 is provided. In the middle of the steam supply path 19, a combustion type superheater 20 provided with a superheating burner 30 for raising the temperature of 310 ° C. steam generated from the waste heat recovery boiler 6 to 500 ° C. is provided. A reheating pipe 27 for reheating steam from the side turbine 15 and supplying it to the low-pressure turbine 16 is provided, and a combustion type reheater 21 is provided in the middle of the reheating pipe 27. In the figure, reference numeral 32 denotes a reheating burner. The combustion type reheater 21
At 400 ° C., 3.9 × 10 ⁴ Nm ³ / h of flue gas can be obtained, and the flue gas is supplied to the white smoke prevention device 14 so as to be supplied to the white smoke prevention device 14.
Is plumbed. The combustion type superheater 20 maintained the air ratio at 2 to increase the oxygen concentration at 400 ° C. and 8.3.
X 10 ⁴ Nm ³ / h, and a part of this combustion exhaust gas is 2.0 × 10 ⁴ Nm ³ / h.
As the secondary combustion auxiliary gas in the incinerator 1
A secondary combustion gas supply 22 leading to the secondary combustion auxiliary combustion gas supply unit 9 is provided. The remainder of the combustion exhaust gas with the increased oxygen concentration is used as a drying gas and a primary combustion assisting gas for the object to be treated in the incinerator as a drying gas supply unit 23 and a primary combustion auxiliary combustion gas supply unit 24. In order to supply 3.15 × 10 ⁴ Nm / h ³ each, a pipe branched from the middle of the secondary combustion gas supply path 22 is provided with a drying gas supply path 33 and a primary combustion gas supply path 34.
Is formed. In the figure, reference numerals 28, 29, and 35 denote dampers for adjusting a gas flow rate. The steam or water at 52 ° C. from the low-pressure side turbine 16 is supplied to the waste heat recovery boiler 6 in a state where the steam or water is heated to 250 ° C. by heat exchange with the exhaust gas of the incinerator 1. A heat exchange pipe 25 passing through the flue gas passage 10 of the incinerator 1 is provided. A supply water supply section 26 is provided in the middle of the heat exchange pipe 25. By applying heat to the waste heat recovery boiler 6, 300
Exhaust gas that has reached 150 ° C.
2, at 91 ° C., into the smoke cleaning device 13, at 65 ° C., into the white smoke prevention device 14, where 400 ° C. from the combustion reheater 21, 3.9 × 10 ⁴ Nm ³ / h, and the temperature is raised to 150 ° C. and 15.3 × 10
The exhaust gas is discharged from the chimney 11 into the atmosphere as ⁴ Nm ³ / h exhaust gas with white smoke eliminated.

[0008] 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 the drawings]

FIG. 1 is an explanatory view showing an embodiment of a municipal garbage incinerator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incinerator 6 Waste heat recovery boiler 9 Secondary combustion auxiliary gas supply part 17 Power generation steam turbine 19 Steam supply path 20 Combustion superheater 22 Secondary combustion gas supply path 23 Drying gas supply part 24 Primary combustion auxiliary combustion Gas supply unit 33 Gas supply path for drying 34 Gas supply path for primary combustion

Continued on the front page (72) Inventor Koji Ishida 1-47, Shishitsuhigashi 1-chome, Naniwa-ku, Osaka-shi, Osaka (72) Inventor Yoshio Inoue 3- 1-3 Nihonbashi Muromachi, Chuo-ku, Tokyo, Japan No. Kubota Corporation Tokyo Head Office (56) References JP-A-57-164202 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23G 5/44 F22B 1/18 F22G 3 / 00 F23G 5/46

Claims (1)

(57) [Claims] 1. A waste heat recovery boiler (6) for exhaust gas from an incinerator (1) having a secondary combustion auxiliary gas supply section (9), and steam generated from the waste heat recovery boiler (6) Municipal waste incineration provided with a steam supply path (19) for supplying steam to a power generation steam turbine (17) and a combustion type superheater (20) for raising the temperature of the steam in the steam supply path (19). an apparatus, wherein the combustion exhaust gas from the combustion type superheater (20), the secondary combustion gas supply passage for guiding the combustion aid gas supply section for secondary combustion (9) (22) as well as the drying gas supply unit An incinerator for municipal waste provided with a drying gas supply path (33) leading to (23) and a primary combustion gas supply path (34) leading to a primary combustion auxiliary combustion gas supply part (24).