JPH01310202A - Construction of furnace for partial combustion of coal - Google Patents

Abstract

PURPOSE:To improve the rate of ash removal and to separate satisfactorily the gas and slag, by throwing at a high speed high temperature, gas and molten slag generated in a horizontal type furnace for partial combustion of coal into a vertical type furnace for partial combustion of coal in the tangential direction to it and making the molten slag flow down from an overflow port. CONSTITUTION:Into a horizontal type furnace 10 for partial combustion of coal primary air and pulverized coal are blown from the nozzle 12a of a duct 12 which is in the direction tangential to the furnace 10 and secondary air from the nozzle 12b of the duct 12. The pulver ized coal is partially burned as it is swirled at a high speed in the furnace 10 which has been heated to high temperature by a preheating burner 13 at starting. The generated high temperature gas is blown into a vertical type furnace 15 for partial combustion of coal at a high speed in the direction tangential to the furnace 15 and the mist of the molten slag in the high temperature gas hits the circumferential wall and descends along a refractory material 26 to settle into a slag reservoir 16, and as the gas that contains a little amount of the mist swirls by a large swirling energy the gas flows out of a gas duct 25 at the center of the upper face. The slag that melted in the furnace 10 flows in the bottom of the furnace accompanied by the high temperature gas and flows into the furnace 15 tangentially to it from an outlet opening 14 and flows down to a slag reservoir 16 at the middle high section and is cooled and soldified in a water tank 29 and carried out by a conveyor 28.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the structure of a coal partial combustion furnace.

[Conventional technology]

The coal partial combustion furnace is being developed for the purpose of fuel conversion (heavy oil - coal) for general industrial Kahura-fired boilers.
As shown in Fig. 4, a tangential duct 2 is connected to a cylindrical furnace 1.
Combustion air and pulverized coal are input from the furnace, and while they are swirled at high speed, they are partially combusted in a short time by the preheating burner 3, and the ash of the input pulverized coal is discharged as molten ash from the outlet 4 at the bottom of the furnace, resulting in less ash. The purpose is to combust gas in the boiler combustion chamber 5 using air for two-stage combustion. (As a prior art document, there is, for example, the 8th Concave Collection.) [Problems to be Solved by the Invention] However, in the structure of the above-mentioned coal partial combustion furnace, there is a limit to the deashing rate. It is hoped that a coal partial combustion furnace will be developed that can improve the performance.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a structure of a coal partial combustion furnace that can improve the deashing rate and can satisfactorily separate gas and slag.

[Means to solve the problem]

The structure of the coal partial combustion furnace of the present invention for solving the above problems is such that the outlet side of the horizontal coal partial combustion furnace is narrowed down and connected to the vertical coal partial combustion furnace from the tangential direction. An annular slag pool is provided in the section, a slag overflow port is provided on the inner circumferential wall of the slag pool at a position on the side of the horizontal coal partial combustion furnace, and a slag cutting device is provided below the slag overflow port. A gas duct is installed in the center of the upper surface of a coal partial combustion furnace.

It is preferable that the furnace bodies of the horizontal coal partial combustion furnace and the vertical coal partial combustion furnace both have a water-cooled wall structure, and a refractory material is attached to the inner surface.

Further, it is preferable that the gas duct has a water-cooled wall structure.

Furthermore, the body extending to the lower end of the vertical coal partial combustion furnace is
It is preferable that the drag chain conveyor is immersed in a water tank.

[For production]

According to the coal partial combustion furnace of the present invention configured as described above, the high temperature gas obtained by partial combustion while rotating at high speed in the horizontal coal partial combustion furnace is tangentially transferred to the vertical coal partial combustion furnace from the narrowed outlet. It is blown in at a higher speed and flows out from the gas duct in the center of the upper surface while rotating with a large swirling force. In addition, the slag melted in the horizontal coal partial combustion furnace flows along the bottom of the furnace accompanied by the high-temperature gas, flows tangentially into the vertical coal partial combustion furnace from the narrowed outlet, and circulates around the slag pool in the middle and high part. It flows down from the overflow port provided on the inner peripheral wall.

When the slag flowing down from the overflow port solidifies, it is cut and dropped by a slag cutting device.

If the vertical coal partial combustion furnace is equipped with a drag chain conveyor water tank, the slag flowing down from the overflow port will be
After being cooled and solidified in a water tank, it is transported out by a drag chain conveyor.

〔Example〕

An embodiment of the structure of a coal partial combustion furnace according to the present invention will be described with reference to FIGS. 1 and 2. 1o is a horizontal coal partial combustion furnace, and a duct 12 is installed in the tangential direction of one end side of a cylindrical furnace body 11. It is provided. The duct 12 has a nozzle 12a that inputs primary air and pulverized coal, and a nozzle 1 that inputs secondary air.
2b are provided alternately in a four-stage slit shape. Furnace body 1
A preheating burner 13 is provided at the center of one end surface of the fuel cell 1, and the outlet 14 side of the other end is narrowed and connected tangentially to a vertical coal partial combustion furnace 15. An annular slag sump 16 is provided at a middle and high part of the vertical coal partial combustion furnace 15 at a position lower than the bottom of the horizontal coal partial combustion furnace IO. Furnace IO
A slag overflow port 17 is provided at a side position. A slag cutting device 18 is provided below the slag overflow port 17. The slag cutting device 18 has a cutter 21 fixed to the tip of a rod 20 that slidably penetrates the furnace body 19 of the vertical coal partial combustion furnace 15, and a cylinder 22 with the base end of the rod 20 installed outside the furnace. It is connected to the tip of the piston rod 23 via a joint 24. A gas duct 25 is provided at the center of the upper surface of the vertical coal partial combustion furnace 15, with its base end being connected through the gas duct 25.

The furnace body 11 of the horizontal coal partial combustion furnace IO and the furnace body 19 of the vertical coal partial combustion furnace 15 both have a water-cooled wall structure, and a refractory material 2B is attached to the inner surface. In addition, the gas duct 2
5 also has a water-cooled wall structure.

The body 27 extending from the lower end of the vertical coal partial combustion furnace 15 is immersed in a water tank (drag chain conveyor casing) 29 having a drag chain conveyor 28, as shown in FIG. It is located downstream.

To explain the operation of the coal partial combustion furnace of the embodiment with the above structure, primary air and pulverized coal are blown into the horizontal coal partial combustion furnace IO from the nozzle 12a of the duct 12 in the tangential direction, and secondary air is blown from the nozzle 12b. The coal is blown in, and while rotating at high speed, it is partially combusted in the horizontal coal partial combustion furnace IO, which is heated by the preheating burner 13 at the time of startup. The high temperature gas generated by this partial combustion is narrowed down to the outlet 1.
The molten slag mist in the high-temperature gas hits the peripheral wall, runs along the refractory material 26, enters the slag pool 16, and slag The gas with less mist flows out from the gas duct 25 at the center of the upper surface while swirling with a large swirling force.

Further, the slag melted in the horizontal coal partial combustion furnace IO flows through the bottom of the furnace accompanied by the high temperature gas, and flows through the narrowed outlet 14.
The slag flows into the vertical coal partial combustion furnace 15 from the tangential direction as shown by the arrow in FIG.
The slag flows around the slag pool 16 as shown by the arrow and flows down from the slag overflow port 17 provided on the inner circumferential wall 18a. The slag that has flowed down is carried out by driving the groove conveyor 28 in FIG. When the slag flowing down from the overflow port 17 solidifies, it accumulates and the slag flow hole 16b surrounded by the inner circumferential wall lea of the slag reservoir 16 becomes narrower. The slag is cut by a slag cutting device 18 shown in FIG. That is, the cylinder 22 is operated, the rod 20 connected to the piston rod 23 is slid forward, and the cutter 21 fixed at the tip is moved forward.
The hanging and solidified slag is cut and dropped onto a drag chain conveyor 28 in a water tank 29.

〔Effect of the invention〕

As can be seen from the above explanation, according to the structure of the coal partial combustion furnace of the present invention, the high temperature gas and molten slag generated in the horizontal coal partial combustion furnace are fed into the vertical coal partial combustion furnace from a tangential direction at high speed, Since it rotates, the demineralization rate improves. Further, the molten slag is collected in the slag pool of the vertical coal partial combustion furnace and is allowed to flow down from the slag overflow port in the direction of gravity opposite to the flow of the high-temperature gas, so that the high-temperature gas and the molten slag can be separated well.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the structure of a coal partial combustion furnace of the present invention, FIG.
The figure is an overall assembly diagram of a coal partial combustion furnace of the present invention, and FIG. 4 is a cutaway perspective view of a conventional coal partial combustion furnace. lO...Horizontal coal partial combustion furnace 11...Furnace body 12
...Ducts 12a, 12b...
Nozzle 13...Preheating burner 14...Outlet 15...Vertical coal partial combustion furnace 16...Slag reservoir 16a...Inner peripheral wall 113b...Slag flow hole 17...Slag overflow port 18 ... Slag cutting device I9 ... Furnace body 20 ... Rod 21 ... Cutter 22 ... Cutter air cylinder 23 ... Piston rod 24 ... Joint 25
...Gas duct 26...Fireproof material 27...
・Bottom section 28 extending downward...drag chain conveyor

Claims (1)

[Claims] 1) The outlet side of the horizontal coal partial combustion furnace is narrowed down and connected to the vertical coal partial combustion furnace from the tangential direction, and an annular slag reservoir is provided in the middle and high part of the vertical coal partial combustion furnace. A slag overflow port is provided on the inner peripheral wall of the slag basin at a position on the side of the horizontal coal partial combustion furnace, a slag cutting device is provided below the slag overflow port, and a gas duct is installed in the center of the upper surface of the vertical coal partial combustion furnace. Structure of a coal partial combustion furnace. 2) The structure of a coal partial combustion furnace according to claim 1, wherein the body extending from the lower end of the vertical coal partial combustion furnace is immersed in a drag chain conveyor water tank.