JPS589A - Waste heat recovery device for fluidized bed type incinerator - Google Patents

Abstract

PURPOSE:To improve heat recovery efficiency and facilitate maintenance, in a fluidized bed incinerator, by inserting a heat pipe in the upper layer of the fluidized bed. CONSTITUTION:The heat pipe 3 has its upper portion penetrating the boiler wall in the boiler water 2C and the upper wall 1a of the incinerator furnace, and its lower portion being inserted in the upper layer 4a of the fluidized bed 4. The heat pipe 3 is in direct contact with the fluidized bed particles, which are maintained at high temperature due to combustion heat, to effect heat recovery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for directly recovering waste heat from the fluidized bed of a fluidized bed incinerator.

As a waste heat recovery device for an incinerator for municipal solid waste, etc., there is a recuperator (combustion gas-air heat exchanger) or a waste heat boiler installed downstream of the incinerator main body. Recuperators have poor heat recovery efficiency and are mainly used only to preheat the combustion air of the incinerator, and waste heat boilers are large in size even though they can only obtain low-pressure steam, and both There is a problem with dust adhering to the tubes of both devices.

The present invention uses a heat pipe type boiler, which has recently become widely used, for the above-mentioned heat recovery by placing the heat pipe in the upper layer of the fluidized bed, thereby achieving high heat recovery efficiency and easy maintenance. It was developed as a unique device.

The heat pipe boiler referred to here has a structure in which the boiler water in the steam drum and the heat transfer section (heat recovery section) outside the drum are thermally connected by a large number of rod-shaped heat conductors, that is, heat pipes.

A waste incinerator equipped with such a boiler will be explained with reference to FIG.

The figure is a longitudinal cross-sectional view showing the principle of this device, where ■ is the incinerator body;
2 is a steam drum, 3 is a heat pipe.

4 is the fluidized bed, 5 is the waste thrown in from the waste input port 6, 7
8 is a combustion air inlet, 8 is a fluidized bed particle circulation path, 9 is a furnace exhaust gas port, and 10 is an incombustible material discharge port.

2a, 2bH boiler 2 water inlet, steam outlet, 2c
This is boiler water. In the figure, the upper part of the heat pipe 3 is submerged in the boiler water 2c, and the upper part of the heat pipe 3 is inserted into the boiler wall and the incinerator upper wall 1a.
The lower part thereof is inserted into the upper part 4a of the fluidized bed 4. In this way, in the present invention, the heat pipe 3, which is a member that sucks up waste heat, has a high temperature due to the combustion heat. Since heat is recovered by direct contact with the fluidized bed particles, the heat recovery efficiency is better than conventional requipelators or waste heat boilers, which recover heat by contact with exhaust gas.

In addition, there is no fear that the heat recovery efficiency will decrease due to dust adhering to the tube, and maintenance is easier. Note that FIG. 2 shows an example in which a heat pipe type boiler is attached to the side of the incinerator 1, and the heat pipe type boiler is placed in a horizontal position. The one shown in FIG. 1 or the one shown in FIG. 2 may be selected as appropriate depending on how well it fits in the installation location of the device.

[Brief explanation of drawings]

Figure 1 shows the principle of a waste heat recovery device in which a heat pipe of a heat pipe boiler is installed in the upper layer of the fluidized bed of a fluidized bed incinerator of the present invention, and Figure 2 shows the principle of a waste heat recovery device in which a heat pipe of a heat pipe boiler is installed in the upper layer of the fluidized bed of a fluidized bed incinerator. Both are longitudinal cross-sectional views showing examples attached to the sides. 1. Incinerator body 2, steam drum 3, heat pipe 4, fluidized bed 5, trash 6, garbage input port a, combustion chamber air inlet 8, fluidized bed particle circulation path 9, exhaust gas port 10, non-combustible material discharge port application Person Mitsui Engineering & Shipbuilding Co., Ltd. Agent Shigeo Kawata

Claims (1)

[Claims] A waste heat recovery device in which a heat pipe from a heat pipe boiler is installed in the upper part of the fluidized bed of a fluidized bed incinerator.