JP2755879B2 - Waste incinerator with boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a municipal waste incinerator provided with a boiler for generating superheated steam.

[0002]

2. Description of the Related Art In a conventional refuse incinerator provided with a boiler that generates superheated steam, a superheater is installed inside a boiler body that generates saturated steam, and a superheater pipe is provided for surface protection. No lining with refractory material. And the main combustion chamber of the refuse incinerator
It is composed of a water-cooled wall that generates saturated steam, and a lining made of a refractory material is applied to a portion where the flame hits.

[0003]

There is a social need to generate high-temperature, high-pressure steam at about 500 ° C. and about 100 atg by incineration combustion gas. However, at present, materials capable of withstanding high temperatures of 500 ° C. in an incineration corrosive gas atmosphere are available. 430 ° C. is the result when no refractory lining is provided.

The temperature of saturated steam of 100 atg is about 31
When the temperature of the main combustion chamber is 0 ° C. and the wall surface of the main combustion chamber is formed of a water-cooled wall tube that generates saturated steam as in the related art, it is necessary to increase the refractory lining range for preventing hot corrosion. An object of the present invention is to provide a refuse incinerator with a boiler that can obtain high-temperature and high-pressure steam at about 500 ° C. and about 100 atg, which was conventionally difficult to obtain with a boiler attached to the refuse incinerator.

[0005]

According to the present invention, in order to solve the above-mentioned problems, the wall of a main combustion chamber is formed by a group of tubes constituting a primary superheater, and steam exiting the primary superheater is guided. A configuration is adopted in which a tube group after the secondary superheater is disposed in the main combustion chamber.

That is, in the present invention, in order to solve the above-mentioned problems, it is not expected to improve the corrosion resistance of the superheater tube by improving the metal material, but to prevent the high temperature corrosion of currently available materials by the fireproof lining. Do. In this case, in order to compensate for the deterioration of the heat transfer performance to the superheater pipe, the superheater pipe is installed in the main combustion chamber which is the hottest gas condition in the incinerator.

When the main combustion chamber is constituted by a water-cooled wall pipe generating saturated steam, the refractory lining range increases,
It is uneconomical to bake the fireproof lining of the pressure resistant part at the saturation temperature from the viewpoint of the boiler efficiency. Therefore, the main combustion chamber is constituted by the superheater pipe in which the refractory lining is indispensable as described above.

[0008] Thus, the main combustion chamber of the refuse incinerator is
Both the wall surface and the heat exchange portion inside the combustion space are formed by a superheater tube. Further, in the present invention, a configuration is adopted in which the entire surface of the tube group constituting the superheater that contacts the combustion gas in the main combustion chamber is lined with a refractory material.

[0009]

According to the present invention, as described above, the main combustion chamber under the high-temperature gas condition is constituted by the superheater pipe, so that the heat transfer performance by the refractory lining applied to the pipe group constituting the superheater in order to prevent high-temperature corrosion. It is possible to compensate for deterioration,
High-temperature steam generation is possible.

The primary superheater is placed on the furnace wall tube, and
Since the subsequent superheaters are installed in the main combustion chamber space, it is possible to control the steam temperature by water injection at the connection of these superheaters.

Further, according to the present invention, in the tube group constituting the superheater, a structure in which the entire surface in contact with the combustion gas in the main combustion chamber is lined with a refractory material, the inside of the furnace due to a change in combustion conditions is not provided. It is possible to respond to changes in the corrosive environment due to changes in radiation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a waste incinerator with a boiler according to the present invention will be described in detail with reference to an illustrated embodiment. In FIG. 1, reference numeral 1 denotes a main combustion chamber, the wall surface of which is formed by a group of tubes constituting a primary superheater 2.

Reference numeral 3 denotes a secondary superheater, and reference numeral 4 denotes a final superheater. Reference numeral 5 denotes a collecting header for the primary superheater. Reference numeral 6 denotes a saturated steam supply pipe, 7 denotes a steam drum, and 8 denotes supply of desuperheated water. Reference numeral 10 denotes an evaporator tube, 11 denotes an economizer, and 12 denotes a saturated steam generator.

In the refuse incinerator shown in FIG. 1, the boiler feed water 13 is preheated by an economizer 11 and then guided to a saturated steam generator 12 via a steam drum 7, where it becomes saturated steam again. Is gathered. The saturated steam is further supplied from a saturated steam supply pipe 6 to an inlet of the primary superheater 2 which forms a wall surface of the main combustion chamber.

The steam superheated in each section of the primary superheater 2 is collected in a primary superheater manifold 5 and then collected.
It is supplied to the secondary and subsequent super heaters 3 installed in the combustion chamber space, and is guided from the final super heater 4 to the main steam line 9. The temperature control of the main steam line 9 is performed by injecting the desuperheated water 8 into the connection between the superheaters 2, 3, and 4, so that the main steam is always kept at a constant temperature.

The primary superheater 2, the secondary superheater 3, and the final superheater 4 constituting the main combustion chamber 1 are all lined with a high-temperature corrosion-resistant and high-heat-conductivity refractory material, and have a superheated steam temperature. While generating steam at about 500 ° C, it withstands continuous use up to an atmospheric gas temperature of about 1,200 ° C.

Since the wall temperature of the main combustion chamber 1 is higher than that of the conventional water cooling pipe using saturated steam, the outlet gas of the main combustion chamber 1 is higher than the conventional gas. By increasing the heat transfer area of No. 11, heat can be recovered, and the required temperature of 20 from the exhaust gas treatment device side
A reduction to 0 ° C. takes place.

As described above, the present invention has been specifically described based on one embodiment. However, it is needless to say that the present invention is not limited to this, and various changes may be made within the scope of the present invention. . For example, in the illustration, the superheater is primary,
Although the secondary and final three stages are employed, this may be increased or decreased as appropriate.

[0019]

As described above in detail, in the incinerator with a boiler according to the present invention, the wall surface of the main combustion chamber is formed by a tube group constituting the primary superheater, and the steam exiting the primary superheater is formed. Is adopted in the main combustion chamber, and the heat transfer area of the superheater can be reduced by installing the superheater pipe in the high-temperature gas region.

Further, the superheater pipe is capable of generating superheated steam at 500 ° C. by the fire-resistant and corrosion-resistant lining.
Furthermore, since the main combustion chamber has a superheater pipe lining configuration instead of a saturated steam water cooling wall lining configuration, the saturating steam generation section is entirely free of lining, so that heat transfer performance can be improved and the entire boiler can be downsized.

Further, according to the present invention, in the tube group constituting the superheater, a structure in which the entire surface that comes into contact with the combustion gas in the main combustion chamber is lined with a refractory material, the inside of the furnace due to a change in the combustion conditions is used. It is possible to respond to changes in the corrosive environment due to changes in radiation.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a waste incinerator with a boiler according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main combustion chamber 2 Primary superheater 3 Secondary superheater 4 Final superheater 7 Steam drum 8 Reduced temperature water 10 Evaporation pipe 11 Economizer 12 Saturated steam generation part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeharu Matsuura 12 Nishikicho, Naka-ku, Yokohama-shi Yokohama Heavy Industries, Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) F22G 1/02 F22G 7 / 00-7/12

Claims (2)

(57) [Claims] In a refuse incinerator provided with a boiler for generating superheated steam, a wall surface of a main combustion chamber is formed by a tube group constituting a primary superheater, and steam exiting the primary superheater is guided. A refuse incinerator with a boiler, wherein a tube group following the next superheater is arranged in the main combustion chamber. 2. A refuse incinerator with a boiler according to claim 1, wherein the entire surface of the tube group constituting the superheater, which comes into contact with the combustion gas in the main combustion chamber, is lined with a refractory material.