JPS61235493A - Slag discharging apparatus for gasifying oven - Google Patents

Abstract

PURPOSE:To provide the title apparatus capable of stably and continuously discharging a slag without affecting operating conditions of a gasifying oven and gasifying performance, by incorporating a heater in a molten slag discharging portion in a spouted bed coal gasifying oven. CONSTITUTION:A spouted bed coal gasifying oven in which a coal and a gasifying agent are fed into a gasifying oven 1 to form a gas by gasification while an ash produced is molten in a high-temp. atmosphere to form a molten slag 5 which is in turn discharged into the outside of the furnace 1, characterized in that the furnace 1 is equipped with a slag hole 12 at the bottom thereof the outer side of which is surrounded by a water-cooled wall 2 branched from the end of a water-cooled wall inlet tube 15 and to which a fireproofing material 11 and a refractory and thermal insulating material 13 are applied and that a heater 14 is incorporated in the refractory and thermal insulating material 13. The above slag discharging apparatus can prevent the slag from being cooled and solidified without affecting operating conditions of the gasifying oven 1 and gasification performance.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a slag discharge device in a gasification furnace, and in particular, it is capable of safely and continuously discharging molten coal ash slag in an entrained bed type coal gasification furnace. Regarding equipment.

(Prior art) Conventionally, when discharging slag from a coal gasification furnace, when the slag discharge port is sealed with slag, the pressure inside the furnace is reduced by removing the gas inside the molten slag reservoir with a pump, etc. There is a method (Japanese Unexamined Patent Publication No. 59-145289) in which the slag is forcibly discharged by increasing the pressure difference, but it has the following serious drawbacks.

There is a risk that the high-temperature gas in the furnace will suddenly flow out and burn out the gas venting system.

(b) There is a risk that the internal pressure will change drastically during slag removal, making stable operation impossible.

In addition, there is a method of preventing the slag from being excessively cooled by branching off a part of the high-temperature gas in the furnace so that the slag discharge port is not sealed by the slag, and causing it to flow backwards through the slag hole. JP-A-58-29887), but it has the following drawbacks.

-Gasification performance deteriorates because some gas is continuously extracted.

However, it is difficult to dispose of the released gas.

(C) Since high-temperature gas flows inside the furnace, there is a risk of burnout of the gas vent system.

(Problems to be Solved by the Invention) The present invention is capable of stably and continuously discharging molten coal ash slag in a gasifier, particularly an entrained bed type coal gasifier, and is capable of stably and continuously discharging molten coal ash slag in a gasifier, particularly an entrained bed coal gasifier. It is an object of the present invention to provide a slag discharge device for a gasifier that can discharge slag without adversely affecting operating conditions and performance.

(Means for Solving the Problems) The present invention incorporates a heater into the fireproof insulation material installed in the constricted part of the slag hole, and cools the slag in that part by heating it intermittently or continuously. The present invention is characterized by preventing solidification, and the present invention is characterized by introducing coal and a gasification agent into a furnace to generate gasification gas, melting the ash in a high-temperature atmosphere, A slag discharge device for a gasifier is characterized in that a heater is incorporated in a molten slag discharge section in an entrained bed type coal gasification furnace in which the molten slag is discharged outside the furnace.

The device of the present invention can be advantageously applied not only to entrained bed type gasifiers but also to slag tap boilers.

An embodiment of the apparatus of the present invention is shown in FIGS. 1 and 2 below. FIG. 1 shows the overall structure of the gasifier, and FIG. 2 shows an enlarged view of the slag hole.

(Structure) The gasifier 1 is surrounded by a water-cooled wall 2, and coal, 4P-3, and a gasifier 4 (air, oxygen-enriched air, oxygen, etc.) are charged into the lower part of the furnace and heated to a high temperature. The ash becomes molten slag 5 and flows down into the ash hopper 6 below.

Cooling water 7 is supplied to the ash hopper 6, and the molten slag 5 that has flowed down is rapidly cooled by the water and discharged to the outside as granulated slag 8.

On the other hand, the coal 9 introduced from a slightly upper position is gasified by utilizing the high temperature inside the furnace. The generated gas 10 is guided outside the furnace and sent to dust removal and desulfurization equipment.

As shown in FIG. 2, a refractory material 11 is installed inside the water-cooled pipe 2I of the water-cooled wall 2 of the gasifier 1 to effectively perform gasification while minimizing the heat transmitted to the water side. A slag hole 12 is provided below the furnace 1 and is designed to be as small as possible in order to minimize the loss of heat downwards.

The outside of the slag hole 12 is surrounded by a water-cooled wall 2 branched from a water-cooled wall inlet header 15, and a refractory material 11 and a refractory insulation material 15 are installed, and a heater 14 is incorporated into the refractory insulation material.

The heater 14 may be of any type, such as an electric type, a high temperature steam type, or a high temperature gas heating type.

The slag discharge device for the gasifier of the present invention described above includes (1)
2. It is possible to prevent the slag from cooling and solidifying without any adverse effect on the operating conditions and gasification performance of the gasifier.
D, 121 The slag hole is selected to be as small as possible to reduce the heat dissipated in the downward direction, thereby contributing to the improvement of gasification performance.

Brief description of the front surface FIG. 1 is a schematic diagram showing the overall configuration of the gasifier of the present invention, and FIG. 2 is a schematic diagram showing an enlarged state of the slag hole portion.

Sub-agent: 1) Akira Sub-agent Ryo Hagi Hara -

Claims (1)

[Claims] In an entrained bed type coal gasification furnace, coal and gasifying agent are put into the furnace to produce gasified gas, and ash is melted in a high-temperature atmosphere and discharged outside the furnace, a heater is installed at the molten slag discharge section. A slag discharge device for a gasifier, characterized in that it incorporates.