JPH0682005A - Boiler equipped with refuse incinerator - Google Patents

Abstract

PURPOSE:To provide a refuse incinerator to which a super-heater-equipped boiler is installed from which high temperature and high pressure superheated steam is available. CONSTITUTION:The symbol 1 represents a main combustion chamber. The furnace wall is formed with a group of pipes which constitute a primary super heater 2. A secondary super heater 3 and an end heater 4 are laid out in a space of the main combustion chamber 1. The feed water 13 which has passed through an economizer 11 is turned into a saturated steam in a saturated steam generation section 12 and collected into a steam drum 7 and supplied to the super heater from there. The primary heater 2 which constitutes the main combustion chamber 1 and the secondary and subsequent super heaters 3 and 4 installed in the combustion space are made of high temperature and corrosion resistant materials in all cases. They are lined with refractories having a high thermal conductivity as well. Based on this construction, a refuse incinerator is designed to withstand the continuous service of an ambient gas whose temperature is available up to 200 deg.C, generating superheated steam of 500 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of an municipal solid waste incinerator equipped with a boiler for producing superheated steam.

[0002]

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

[0003]

Although there is a social need to generate high temperature and high pressure steam of about 100 atg at 500 ° C by refuse incineration combustion gas, at present, a material that can withstand a high temperature of 500 ° C in a refuse incineration corrosive gas atmosphere. Since it does not exist, about 430 ° C is the actual result when the refractory lining is not used.

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

[0005]

In order to solve the above-mentioned problems, the present invention forms the wall surface of the main combustion chamber with a group of tubes constituting a primary superheater, and guides the vapor leaving the primary superheater. A configuration is adopted in which the tube group after the secondary super heater is arranged 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 pipe by improving the metal material surface, and the high temperature corrosion prevention of the currently available material is carried out by the fire resistant lining. To do. In this case, in order to compensate for the decrease in heat transfer performance to the superheater tube, the superheater tube is installed in the main combustion chamber, which is the hottest gas condition in the incinerator.

When the main combustion chamber is composed of a water-cooled wall tube that produces saturated steam, the refractory lining range increases, but at 310 ° C.
It is uneconomical to consider the fireproof lining of the pressure-resistant part at the saturation temperature of, considering the boiler efficiency. Therefore, the main combustion chamber is composed of the superheater tube in which the refractory lining is indispensable as described above.

In this way, 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 super heater tube. Further, in the present invention, a configuration is adopted in which all surfaces of the tube group constituting the superheater that come into contact with the combustion gas in the main combustion chamber are lined with a refractory material.

[0009]

In the present invention, as described above, the main combustion chamber under the high temperature gas condition is composed of the superheater pipe, so that the heat transfer performance by the fireproof lining applied to the pipe group constituting the superheater for the purpose of preventing high temperature corrosion It is possible to compensate for deterioration,
Can generate high temperature steam.

Further, the primary super heater is attached to the furnace wall tube and 2
Since the following super heaters are installed in the main combustion chamber space, it becomes possible to control the steam temperature by water injection at the connection of these super heaters.

Further, according to the present invention, in the tube group which constitutes the superheater, in which all the surfaces of the main combustion chamber which come into contact with the combustion gas are lined with a refractory material, the inside of the furnace caused by the change of the combustion condition is adopted. It is possible to respond to changes in the corrosive environment due to changes in radiation.

[0012]

Embodiments Hereinafter, a refuse incinerator with a boiler according to the present invention will be specifically described based on illustrated embodiments. 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 is a secondary superheater, and 4 is a final superheater. Reference numeral 5 is a collective superposition of the primary super heaters. Reference numeral 6 represents a saturated steam supply pipe, 7 represents a steam drum, and 8 represents supply of reduced temperature water. Reference numeral 10 is an evaporation pipe, 11 is an economizer, and 12 is a saturated steam generating part.

In the waste incinerator shown in FIG. 1, the boiler feed water 13 is preheated by the economizer 11 and then guided to the saturated steam generation section 12 via the steam drum 7, where it becomes saturated steam and becomes steam steam again. Be assembled in. The saturated steam is further supplied from the saturated steam supply pipe 6 to the inlet of the primary superheater 2 which constitutes the wall surface of the main combustion chamber.

After the steam superheated in each part of the primary superheater 2 is collected in the primary superheater collecting pipe header 5,
It is supplied to the secondary and subsequent super heaters 3 installed in the combustion chamber space and 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 reduced-temperature water 8 to the connection part of each super heater 2, 3, 4, and 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 refractory material having high-temperature corrosion resistance and high thermal conductivity, and have a superheated steam temperature. It can withstand continuous use up to atmospheric gas temperature of about 1,200 ℃ while generating steam of about 500 ℃.

Since the wall temperature of the main combustion chamber 1 is higher than that of the conventional water-cooled pipe using saturated steam, the outlet gas of the main combustion chamber 1 is higher than that of the conventional water cooling pipe. It is possible to recover heat by increasing the heat transfer area of 11, which is the required temperature of 20 from the exhaust gas treatment device side.
Reduction to 0 ° C is performed.

Although the present invention has been specifically described with reference to one embodiment, the present invention is not limited to this, and various modifications may be made within the scope of the present invention. . For example, in the one shown, the super heater is
The secondary and final three stages are adopted, but this may be increased or decreased as appropriate.

[0019]

As described above in detail, in the waste incinerator with a boiler according to the present invention, the wall surface of the main combustion chamber is formed by the tube group constituting the primary superheater, and the steam discharged from the primary superheater is used. Since the tube group after the secondary superheater through which the superheater is introduced is arranged in the main combustion chamber, the heat transfer area of the superheater can be reduced by installing the superheater tube in the high temperature gas region.

Further, the superheater pipe is capable of generating superheated steam at 500 ° C. by the fireproof / corrosion resistant lining.
Furthermore, since the main combustion chamber is composed of the saturated steam water cold wall lining structure and the super heater pipe lining structure, the saturated steam generation part does not have any lining, the heat transfer performance can be improved, and the size of the entire boiler can be reduced.

Further, according to the present invention, in the tube group which constitutes the superheater, in which all the surfaces of the main combustion chamber which come into contact with the combustion gas are lined with a refractory material, the inside of the furnace caused by the change of the combustion condition is adopted. It is possible to respond to changes in the corrosive environment due to changes in radiation.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Main Combustion Chamber 2 Primary Superheater 3 Secondary Superheater 4 Final Superheater 7 Steam Drum 8 Dehumidifying Water 10 Evaporation Pipe 11 Economizer 12 Saturated Steam Generation Section

Front page continuation (72) Inventor Shigeharu Matsuura 12 Nishiki-cho, Naka-ku, Yokohama City Mitsubishi Heavy Industries, Ltd. Yokohama Works

Claims (2)

[Claims] 1. In a refuse incinerator equipped with a boiler for generating superheated steam, the wall surface of the main combustion chamber is formed by a group of tubes constituting a primary superheater, and the steam discharged from the primary superheater is introduced. A waste incinerator with a boiler, characterized in that a tube group after the next superheater is arranged in the main combustion chamber. 2. The refuse incinerator with a boiler according to claim 1, wherein in the tube group constituting the super heater, all surfaces of the main combustion chamber that come into contact with combustion gas are lined with a refractory material.