JPS58153576A - Generating method of steam - Google Patents

Abstract

PURPOSE:To generate superheated steam, by bringing waste gases of combustion into contact with ceramic balls to heat said balls, and bringing said balls into contact with solid powder and granules to heat the powder and granules then feeding the powder and granules together with air into a boiler and heating water tubes and steam tubes. CONSTITUTION:Waste gases 1 of combustion are fed into a heater 2 for ceramic balls and are brought into contact with ceramic balls 5 to heat the balls, whereafter the balls 5 are fed to one end of a rotary heat exchanger 8. Ceramic powder and granules 12 are fed into the exchanger 8 from the other end thereof, and are brought into counter current contact with the balls, whereby the powder and granules 12 are heated. The heated powder and granules 12 and air 41 are mixed to a heated solid-air mixture 23. Such mixture is fed into the lower part of a boiler 24 provided with a water tube groups 26 which evaporates the water flowing in the upper stages to steam and a steam tube group 27 which heats the steam flowing in the lower stages to super heated steam. The water in the group 26 and the steam in the group 27 are heated to generate superheated steam.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for efficiently generating steam, particularly superheated steam, by utilizing the heat retained in dirty exhaust gas containing dust and mist from glass melting furnaces, garbage incinerators, etc.

According to the present invention, ceramic balls, such as alumina balls, and a solid-gas mixture, which is a mixture of air and solid powder particles, such as silica sand, are used as heat carriers, and the heat of the exhaust gas is first applied to the ceramic balls and transferred, Next, the ceramic sphere is brought into contact with the h-body powder body to heat the powder body. The heated powder and granules are fed into a boiler together with air, and the water tubes and steam tubes in the boiler are heated to generate superheated steam.

FIG. 1 is a flowchart that generally explains the method of the present invention. It is.

The combustion exhaust gas 1 is guided into the ceramic ball heating device 2 by a gas supply i13 extending into the device. The ceramic spheres 5 are introduced into the apparatus through the inlet 4 at the top of the apparatus, and as they are discharged in a fixed quantity by the screw feeder 9, they fall downward while forming a moving layer. The injected combustion exhaust gas 1 is distributed between a plurality of dispersion gutter 5' each having an inverted U-shaped cross section or an inverted V-shaped cross section, which are installed radially from the tip of the gas supply pipe inside the device toward the inner wall of the device, and a dispersion gutter 5' that is disposed radially from the tip of the gas supply pipe inside the device toward the inner wall of the device, The current is dispersed without being biased in any direction, and the ceramic spheres are efficiently heated countercurrently with the ceramic spheres.

The dispersion gutter 5' disperses the combustion exhaust gas in the circumferential direction and at the same time promotes a uniform drop of the ceramic spheres. The exhaust gas after heat exchange is discharged from the gas outlet 6 to the outside of the yarn.

The heated ceramic balls enter the Lew feeder 9 through the exit lower part of the lower part of the device.

Ceramic balls are shown in the diagram as heat-resistant and wear-resistant ceramic balls such as alumina, alumina-based spinel, and cordierite.

A dust removal section 10 made of wire mesh or punched metal is provided at the bottom of the outer cylinder of the screw feeder 9 provided at one end of the rotary heat exchanger 8, and the dust that has adhered to the ceramic balls due to contact with the exhaust gas is removed from this section. will be removed.

A screw feeder 11 is also installed at the other end of the rotary heat exchanger.
is provided, from which the ceramic powder 12 to be heated is fed into the apparatus.

The main body of the rotary heat exchanger, that is, the rotating body, is arranged with a downward slope of 37-9 degrees in the direction of the screw feeder 11, which is the feeding device for the powder and granules, and is rotatable on the guide rollers 15. It is mounted on. Reference numeral 16 denotes a one-rotation driving means for the rotary body, and in this embodiment, the zero rotation speed is usually 2 to 5 per minute, which is composed of a motor, a gear rotated by the motor, and a rack that meshes with the gear and surrounds the rotary body. times. Reference numeral 13 indicates an outlet for the heated powder and granular material, and 14 indicates an outlet for the ceramic spheres after heat exchange.

The rotating body includes an outer cylinder 17 and an inner cylinder 1 provided concentrically with the outer cylinder 17.
It consists of 8. The inner cylinder is made of punched metal or wire mesh having a large number of small holes, and each hole has a size that does not prevent the passage of powder particles but prevents the passage of ceramic balls.

Between the inner cylinder and the outer cylinder, there are provided multiple screw blades 19 fixed to both at equal intervals in the circumferential direction, and these blades pass through holes in the inner cylinder to the bottom of the outer cylinder. As the rotating body rotates, the powder and granules that have arrived are pushed out toward the outlet of the granules, and at the same time, the inner cylinder and the outer cylinder rotate integrally. Furthermore, a screw blade 20 is provided between the screw blades, and a screw plate 20 is preferably provided at equal intervals in the circumferential direction, except for a certain length on the powder supply side, and intersects with the screw blades in multiple rows. As the particles are removed from the inner cylinder and rotate, the screw blades scrape up the particles upward in the direction of movement, and they are dropped to a height that exceeds the filled surface of the ceramic balls in the inner cylinder, and then returned to the inner cylinder. The scraper plate 20 is not provided at a certain length on the powder supply side, so the powder particles do not fall onto the ceramic sphere, and the powder particles are brought into contact with the ceramic calves. During this time, as the ceramic particles advance, the powder particles move from the inner tube to the bottom surface of the outer tube toward the supply side of the mixer balls.In this way, the ceramic particles are completely separated from the powder particles.

A weir 21 is provided at the end of the inner surface of the ceramic sphere on the outlet side, and this serves to maintain the amount of the ceramic sphere advancing within the inner cylinder by rotation and inclination at a certain constant ii (height).

The cooled ceramic balls after heat exchange are sent to the ceramic ball heating device 2 through the ceramic ball outlet 14.

After the heated ceramic powder leaves the discharge port 13, it is discharged from a boiler, which will be described later, supplied by a fan 22.
It is mixed with air at about 100° C. from which particulate matter has been removed in a cyclone to form a high-temperature solid-gas mixture 23, which is then sent to a boiler 24.

Details of boiler 24 are shown in FIGS. 4 and 5.

The solid-gas mixture contains 1 ceramic powder such as silica sand or alumina.
Contains a solid-air ratio of 0 to 20 Ay/NWt, 300 to 400
It is fed into the boiler from the inlet 25 at the bottom of the boiler at a temperature of .degree. At the upper level inside the boiler, there is a group of water tubes 26. A large number of water vapor pipe groups 27 are vertically arranged in the lower stage.

Reference numeral 28 indicates a brackish water separator, in which water 29 supplied from the outside enters the water pipe group from the lower header 30 of the upper water pipe group, and as it rises, it is heated countercurrently by the homogeneous mixture, becoming steam and flowing to the upper part. The steam 32 separated by the steam separator enters the steam pipe group from the upper header 33 of the steam pipe group, and as it descends therein, it is converted into a solid-gas mixture in parallel flow. heated and superheated steam 3
5 and is taken out from the lower header 34.

Inside the boiler, a distributor 37 in the shape of two conical shapes joined at the bottom is arranged along the center line, and furthermore, partition plates 36 in the shape of a truncated cone facing downward partition the inside of the boiler at regular intervals in the vertical direction. . The solid-gas mixture introduced from the bottom of the boiler is dispersed by the disperser 37, rises through the gap 38 between the partition plate 36 and the inner wall of the boiler, and passes through the circulating flow path as shown in FIG. to efficiently contact the steam tube group and the water tube group and heat the fluid inside them.

The solid-gas mixture that has reached the upper part of the boiler enters the cyclone 40 through the outlet 39, where the solid content, i.e., the ceramic powder 12, is separated from the gas, i.e., the air, and is transferred to the rotary heat exchange device 8.
sent to The air 41 from which the solid content has been removed is approximately 10
It has a temperature of 0° C. and is mixed with the ceramic powder which is heated again by the fan 22 for air circulation. The surplus air discharged from the cyclone is sent to the bag filter 42, where it is purified and released into the air.

The features of the method of the present invention are as follows.

1. Glass melting furnace because it uses indirect heating method.

Even when the heat source is dirty exhaust gas from a garbage incinerator, etc., there is little corrosion of the metal in the boiler.

2. The heat transfer of the boiler is a fluidized bed type, and the heat transfer coefficient is extremely large, so the boiler can be made compact and superheated steam can be easily obtained.゛3. The solid-gas mixture that is the heat medium is air, and the air at around 100℃ that comes out of the air circulation fan is added with powder (300 to 400℃) heated by a co-rotating heat exchanger. Because it enters the boiler as a powder and granules at a normal temperature, a large amount of work can be obtained with a relatively small fan power.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet that generally explains the method of the present invention;
FIG. 2 is a longitudinal sectional view of the rotary heat exchange device, FIG. 3 is a longitudinal sectional view of the rotary heat exchange device, and FIG. 4 is a front view of the rotary heat exchange device after the outer cylinder is removed. FIG. 5 shows a lateral sectional view of the boiler, and FIG. 6 shows a longitudinal sectional view of the boiler. 1... Exhaust gas 2... Ceramic bulb heating device 5... Ceramic bulb
Death...Rotary heat exchanger 9...Screw feed f 11...Screw feeder 12...Ceramic powder 23...
...solid-gas mixture 24 ...boiler 2
6...Water tube group 27...Steam pipe group
28...Brackish water separator 29...Water
32...Water vapor 35...
Superheated steam 36... Partition plate 37...
...Distributor 40...Cyclone 41...Air '7'2TfJ? Figure 4

Claims (1)

[Claims] 1) In the method of generating steam using combustion exhaust gas, 1) the combustion exhaust gas (1) is introduced into a ceramic ball heating device # (2) and brought into contact with a ceramic ball (5). Step of heating the ceramic sphere; heating the heated ceramic sphere in a rotary heat exchanger (8)
a step of repeatedly bringing the ceramic powder into contact with the ceramic powder (12) fed from the other end of the device in a countercurrent manner to heat the ceramic powder; the heated ceramic powder; A water pipe *(
The boiler (24) is equipped with a steam pipe group (27) for vaporizing the superheated water vapor by flowing water vapor into the lower part of the boiler. A step of generating steam by heating the steam, and then generating superheated steam by heating the steam in the steam pipe group; discharging the solid-gas mixture from the upper part of the boiler and feeding it into the cyclone (40); A steam generation method comprising the steps of separating granular material and feeding the granular material to the other end of the rotary heat exchanger (8).