JPH0449006B2 - - Google Patents

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 oil-fired boilers, and as shown in Figure 4, the cylindrical furnace 1
Combustion air and pulverized coal are input from the tangential duct 2, and are partially combusted in a short time by the preheating burner 3 while rotating at high speed. The aim is to combust the gas with less ash in the boiler combustion chamber 5 using air for two-stage combustion. (As a prior art document, there is, for example, the lecture collection of the 8th Coal Utilization Technology Research Conference.) [Problem to be solved by the invention] However, in the structure of the above coal partial combustion furnace,
Since there is a limit to the deashing rate, there is a desire for a coal partial combustion furnace that can improve the deashing rate.

[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 reservoir is provided in the section, and a slag overflow port is provided on the inner peripheral wall of the slag reservoir 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 provided in the center of the upper surface of the vertical 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.

Further, it is preferable that the body extending from the lower end of the vertical coal partial combustion furnace is immersed in the drag chain conveyor water tank.

[Effect]

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 with 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 a drag chain conveyor water tank is provided below the vertical coal partial combustion furnace, the slag flowing down from the overflow port is cooled and solidified in the water tank before being carried out by the 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. 12 are provided. The duct 12 is a nozzle 1 that injects primary air and pulverized coal.
2a, nozzles 12b for injecting secondary air are provided alternately in a four-stage slit shape. A preheating burner 13 is provided at the center of one end face of the furnace body 11, and the outlet 14 side at the other end is narrowed down to form a vertical coal partial combustion furnace 1.
5 from the tangential direction. An annular slag reservoir 1 is located in 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 10.
6 is provided, and the inner peripheral wall 16 of the slag reservoir 16
A slag overflow port 17 is provided at a position on the horizontal coal partial combustion furnace 10 side. A slag cutting device 18 is provided below the slag overflow port 17. The slag cutting device 18 has a cutter 21 fixed at the tip of a rod 20 that slidably penetrates the furnace body 19 of the vertical coal partial combustion furnace 15.
The proximal end of the piston rod 23 is connected via a joint 24 to the tip of a piston rod 23 of a cylinder 22 installed outside the furnace. 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 10 and the furnace body 19 of the vertical coal partial combustion furnace 15 both have a water-cooled wall structure, and a refractory material 26 is attached to the inner surface.
Further, the gas duct 25 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 of the above structure, primary air and pulverized coal are blown into the horizontal coal partial combustion furnace 10 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 10, 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.
4 into the vertical partial coal combustion furnace 15 from the tangential direction as shown by the arrow in FIG. 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 10 flows along the bottom of the furnace accompanied by the high-temperature gas, and flows into the vertical coal partial combustion furnace 15 from the narrowed outlet 14 in the tangential direction as shown by the arrow in FIG. The slag flows down to the slag pool 16 in the middle and high part, goes around the slag pool 16 as shown by the arrow, and reaches the slag overflow port 17 provided in the inner circumferential wall 16a.
flow further down. The slag that has flowed down is immersed in the water in the water layer 29 shown in FIG. 1, where it is cooled and solidified, and then settles and accumulates on the upper drag chain conveyor 28, so that it is carried out by the drive of the drag chain conveyor 28, as shown in FIG. 3. . The slag flowing down from the overflow port 17 solidifies and accumulates on the inner peripheral wall 1 of the slag reservoir 16.
Since the slag flow hole 16b surrounded by the slag flow hole 16b becomes narrower, the slag that hangs down from the slag overflow port 17 and becomes solidified is removed by the slag cutting device 18 shown in FIG.
Cut by. That is, the cylinder 22 is actuated and the rod 20 connected to the piston rod 23 is activated.
By sliding the cutter 2 forward, the cutter 2 fixed at the tip
At step 1, 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, Because it rotates,
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 vertical sectional view showing an embodiment of the structure of a coal partial combustion furnace of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a coal partial combustion furnace of the present invention. FIG. 4 is a cutaway perspective view of a conventional coal partial combustion furnace. 10... Horizontal coal partial combustion furnace, 11... Furnace body,
12...Duct, 12a, 12b...Nozzle, 1
8... Preheating burner, 14... Outlet, 15... Vertical coal partial combustion furnace, 16... Slag pool, 16a...
...Inner peripheral wall, 16b...Slag flow hole, 17...Slag overflow port, 18...Slag cutting device, 19...
Furnace body, 20... Rod, 21... Cutter, 22
... Air cylinder for cutter, 23 ... Piston rod, 24 ... Coupling, 25 ... Gas duct,
26... Refractory material, 27... Body extending downward, 28... Drag chain conveyor, 29... Water tank (drag chain conveyor casing).

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, and the slag A slag overflow port is provided on the inner peripheral wall of the basin at a position on the horizontal coal partial combustion furnace side, a slag cutting device is provided below the slag overflow port, and a gas duct is provided in the center of the upper surface of the vertical coal partial combustion furnace. The structure of a coal partial combustion furnace consisting of: 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.