JPS62158913A - Industrial waste material melting furnace - Google Patents

Abstract

PURPOSE:To maintain a level of operation and improve an accuracy in an industrial waste material melting furnace of a hot temperature furnace floor type by a method wherein the furnace floor level is detected by a laser type level sensor, and an amount of gas containing oxygen and carbonic combustibles is controlled in response to a detected level. CONSTITUTION:A level of a hot temperature furnace floor A is detected by a laser type level sensor 26. The sensor 26 is provided with three sets of sensing portions 26a and 26b so as to detect a standard level SL, a high level HL and a low level LL and a discriminating portion 26c may discriminate a level of a furnace floor A. When a level shows the high level HL, a flow rate control means 25 is controlled through a control means 26 in such a way as an amount of gas containing oxygen for combustion is increased to more than that found in the case of the standard level SL. In turn, in the case of the low level LL, a feeding volume control means 22 is controlled through a control means 28 in such a way as an amount of feeding of carbonic combustibles is increased. With this arrangement, it is possible to improve an accuracy in maintaining of a furnace floor level.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a high-temperature furnace for melting industrial waste by blowing oxygen-containing gas for combustion from an air supply device into carbon-based combustible materials from a supply facility. The present invention relates to an industrial waste melting furnace configured to form a bed.

[Conventional technology]

Conventionally, when introducing carbon-based combustible materials into a furnace, a fixed amount of carbon-based combustible material was introduced at approximately regular intervals, the upper surface level of the high-temperature hearth was visually checked, and the upper surface level was maintained within a predetermined range. However, the amount and interval of feeding was determined by the worker.

[Problem that the invention seeks to solve]

However, it is actually extremely difficult or impossible to accurately maintain the upper surface level of the high-temperature hearth, and there is still room for further improvement. Ta.

(b) If the upper surface level of the high-temperature hearth becomes too high, a large amount of carbon-based combustible material will accumulate in an unburned state above the combustion zone, and CO□ from the combustion zone will be reduced with C, resulting in a large amount of C
O is generated and burns above the high-temperature hearth, resulting in enormous energy loss.

(2)) If the upper surface level of the high-temperature hearth becomes too low, there will be a shortage of combustible material in the combustion zone, and the temperature of the high-temperature hearth will drop, resulting in a reduction in processing capacity.

(c) It is extremely difficult or impossible to control both the furnace top pressure and the furnace bottom pressure as specified due to changes in the thickness of the high-temperature hearth, so industrial waste and combustible materials are mixed with the gas in the furnace when being charged. The energy loss caused by blowing out of the furnace, clogging due to solidification of the molten material due to insufficient supply of high-temperature gas to the molten material discharge channel, and excessive supply of high-temperature gas to the molten material discharge channel is enormous.

An object of the present invention is to enable the upper surface level of a high-temperature hearth to be maintained at a predetermined level with good accuracy and reliability.

[Means for solving problems]

A characteristic configuration of the present invention is to detect whether the upper surface level of a high temperature hearth for melting industrial waste is a standard level, a high level above the standard level, or a low level below the standard level. Equipped with a laser level detector,
Based on the information from the level detector, the amount of oxygen-containing gas blown into the high temperature hearth is increased when the upper surface level of the high temperature hearth is at the high level than when it is at the standard level. a first automatic control means for automatically operating the flow rate control means of the air supply device; and a first automatic control means for automatically operating the flow rate control means of the air supply device; The second automatic control means is provided to automatically operate the input amount adjusting means of the supply equipment so as to increase the amount of combustible material input into the system, and its effects are as follows.

[For production]

In other words, by using a laser type level detector, it has become possible to automatically and continuously check the upper surface level of a high-temperature hearth, which was previously thought to be impossible to detect automatically.

When the upper surface level of the high-temperature hearth reaches a high level, the amount of oxygen-containing gas blown for combustion is increased to increase the consumption of carbon-based combustible materials, and for example, the amount of input of carbon-based combustible materials is simply reduced. The upper surface level of the high-temperature hearth can be quickly returned to the standard level.

Also, when the top level of the hot hearth falls to a low level, increasing the input of carbon-based combustibles will quickly bring the top level of the hot hearth to normal levels, for example, rather than simply reducing the consumption of carbon-based combustibles. temperature of the high-temperature hearth can be suppressed.

〔Effect of the invention〕

As a result, the upper surface level of the high-temperature hearth can be maintained with high accuracy and reliability, effectively preventing energy loss due to large amounts of CO generation and reduction in processing capacity due to a drop in the temperature of the high-temperature hearth. At the same time, it is possible to reliably control the furnace top pressure and the furnace bottom pressure, and in turn, it is possible to easily and effectively input industrial waste and carbon-based combustible materials without blowing, and it is possible to easily and efficiently input industrial waste and carbon-based combustible materials into the molten material discharge path. By optimizing the amount of high-temperature gas supplied, energy loss due to clogging of melt can be effectively prevented.

In short, it has become possible to provide an industrial waste melting furnace that is even better in terms of operating costs, energy savings, and furnace performance.

〔Example〕 Next, an example will be shown with reference to FIGS. 1 and 2.

A hopper (2) for charging industrial waste and carbon-based combustible materials is placed between the top and bottom of the vertical furnace (1) with a double damper (
3) to form a high-temperature hearth (A) in the lower part of the furnace with the carbon-based combustible material from the hopper (2). The nozzle (5) that supplies combustion air from the blower (4) to the high-temperature hearth (A) is placed in the furnace with its outlet located below the top surface of the high-temperature hearth (A) and near the bottom of the furnace. An ignition burner (7) is attached to the lower part of the furnace.

The upper part of the furnace (1) is an ascending passage (8) for flue gas, and the lower part of the ascending passage (8) is connected to a cuff (9) for supplying air from the blower (4) for after-combustion. , a duct (1
1).

A discharge path (12) for molten waste is connected to the bottom of the furnace so that industrial waste melted in the high-temperature hearth (A) can be recovered, and a lid (13) is provided to open the bottom of the furnace. There is.

In contrast to the input hopper (2), the storage hopper (
A conveyor (15) such as a belt type conveyor (15) that continuously conveys and supplies the carbon-based combustible material from (14) to a thickness set by the level adjustment in (14a), and a storage hopper (
A conveyor (17) such as a set of screws is installed to continuously supply a fixed amount of industrial waste such as mud from
8) is provided with a program operating means (19) that automatically operates the closing operation of opening and closing the upper damper (3a) and then opening and closing the lower damper (3b) at set time intervals. It is configured to automatically supply standard amounts of carbon-based combustible materials and industrial waste into the furnace (1) at set times. Then, on the conveyor (17),
Input amount setting means (20) for artificially changing and setting the feed amount of industrial waste is attached, and the feed rate of carbon-based combustible material is artificially set on the conveyor (15) by a setting device (21). Input amount adjustment means (2) that adjusts according to the supply amount
2) is attached.

The damper (23) that adjusts the amount of combustion air supplied from the blower (4) to the nozzle (5) is provided with a flow rate control means (25) that adjusts the opening according to the amount of blowing that is manually set by the setting device (24). ) is attached.

The light projecting part (26a) is equipped with a laser level detector (26) that detects the upper surface level of the high temperature hearth (A) depending on whether the laser from the light projecting part (26a) reaches the light receiving part (26b). The furnace (1
), the upper surface level of the high-temperature hearth (A) is the standard level (SL), the upper (SL I+) and the lower (SLL),
a high level (HL) higher than the standard level (SL);
and the low level (L) below the standard level (SL).
The means (26c) for determining whether the
6) Prepare for this.

Based on the information from the determining means (26c), when the upper surface level of the hot hearth (A) is at the high level (HL), the air to the hot hearth (A) is lower than when it is at the standard level (SL). In order to increase the blowing amount by the set amount, and
A) The top surface level is the lower part (SLL) of the standard level (SL).
) and low level (+, L), the standard level (SL
), the first automatic control means (27) instructs the flow rate control means (25) to correct the amount of air blown into the high-temperature hearth (A) by a predetermined amount than when it is at the upper part (SLH) of the high temperature hearth (A). It is provided. Also, based on the information from the determination means (26c), the upper surface level of the high temperature hearth (A) is at a low level (LL
) to increase the amount of carbon-based combustible material introduced into the high-temperature hearth (A) by a set amount than when the standard level (SL) is reached.
Automatic control means (28) are provided.

In short, the upper surface level of the high temperature hearth (A) is at the high level (H
L), the consumption of carbon-based combustible materials is accelerated by increasing the amount of air blowing, and the upper surface level of the high-temperature hearth (A) is brought to the standard level (S).
L), and if the upper surface level of the high-temperature hearth (A) reaches the lower level (SLL) of the standard level (SL), the consumption of carbon-based combustible substances is suppressed by reducing the amount of air blown, If the upper surface level of the high-temperature hearth (A) is suppressed and the upper surface level of the high-temperature hearth (A) becomes a low level (LL), the increase in the amount of carbon-based combustible material input will be reduced to the high-temperature hearth (A). It is configured to quickly return the top surface level to the standard level (SL).

[Another example]

The industrial waste inputted from the hopper (2) is, for example, various kinds of industrial waste such as sewage sludge, tire scraps, municipal waste incineration ash, waste catalyst, etc., or its intermediate treatment products, and carbon-based combustible substances are, for example, , coke, smoky coal such as anthracite, graphite electrode scrap, etc.

Oxygen-enriched air, oxygen, etc. may be supplied from the nozzle (5) to the high-temperature hearth (A), in short, a suitable air supply device (4)
, (5) may be configured so that the oxygen-containing gas for combustion is blown into the high temperature hearth (A).

The specific configuration for supplying carbon-based combustible materials to the high-temperature hearth (A) can be changed as appropriate, and they can be connected to supply equipment (14), (
15), (2), and (3).

The specific configuration of the laser level detector (26) can also be selected appropriately, for example, the light emitting part (26a) and the light receiving part (26b).
- It is possible to install the lower two or four or more stages, and in short, the upper surface level of the high-temperature hearth (A) is at the standard level (SL).
, high level (HL), or low level (LL).

Supply equipment (14), (15), (2), (
The input amount adjusting means (22) of 3) operates the conveyor (15) intermittently to change the supply time per time;
It can be changed to one that changes the time interval between opening operations of the damper (3), or any other suitable one.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, with FIG. 1 being an overall vertical sectional view and FIG. 2 being a conceptual diagram of a control configuration. (4), (5)... Air supply device, (14)
, (15), (2), (3)... Supply equipment, (22)... Input amount adjustment means, (25
)...Flow control means, (26)...Level detector, (27)...First automatic control means,
(28)...Second automatic control means, (A)...
...High temperature hearth.

Claims (1)

[Claims] Industrial waste is removed by blowing oxygen-containing gas for combustion from the air supply devices (4) and (5) into the carbon-based combustible materials from the supply facilities (14), (15), (2), and (3). An industrial waste melting furnace configured to form a melting high-temperature hearth (A), wherein the upper surface level of the high-temperature hearth (A) is at a standard level (SL), which is higher than the standard level (SL). A laser level detector (26) is provided to detect whether the level is a high level (HL) or a low level (LL) lower than the standard level (SL). Based on the information, said hot hearth (A)
The air supply device is configured to increase the amount of combustion oxygen-containing gas blown into the high temperature hearth (A) when the upper surface level is at the high level (HL) than when it is at the standard level (SL). (4), a first automatic control means (27) that automatically operates the flow rate control means (25) of (5), and a first automatic control means (27) that automatically operates the flow rate control means (25) of The supply equipment (14), (15), (2), (3) is configured to increase the amount of carbon-based combustible material input into the high temperature hearth (A) compared to the standard level (SL). a second automatic control means (22) that automatically operates the input amount adjustment means (22);
28) Industrial waste melting furnace.