JP2523646B2 - Clinker ash transportation system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pulverized coal burning boiler, and more particularly to a transportation system suitable for adjusting the water content of bottom clinker ash and improving transportation efficiency.

(Prior Art) Conventionally, in a pulverized coal burning boiler, clinker and ash generated by combustion in the furnace descend and accumulate at the bottom of the furnace and are discharged by a water-sealed clinker conveyor. Draining of clinker ash including particles of particle size is dependent on gravity, and is discharged to the outside by a clinker hopper having a water-sealed structure arranged at the bottom of the furnace and a clinker conveyor configured inside. Normally, this clinker conveyor is installed only in a portion having a water-sealing structure, and therefore, for transporting the clinker to the clinker silo, it is transported to the upper part of the silo by another silo conveyor.

However, due to the recent technological progress, the performance of the pulverized coal pulverizer has been improved, and as a result, the particle size of the pulverized coal has been improved and the combustion ash has become finer accordingly. At the same time, as a measure to reduce nitrogen oxides, the cross-sectional area of the furnace tends to be large, and the rising speed of the combustion gas in the furnace slows down.Therefore, the clinker hopper arranged at the bottom of the furnace has a small size. Clinker ash tended to fall. Therefore, the amount of water associated with the ash discharged from the water sealing section by the clinker conveyor also tends to increase.

(Problems to be solved by the invention) Although the bottom ash has a water content in the range of 50% to 55% at the clinker conveyor outlet, the clinker ash with a high water content has an extremely low transportation efficiency. By storing this in a silo, the water content of 41 ~
When it exceeds 45%, only water separates and stays at the top of the silo as surface water. This surface water had a problem that it suddenly dropped when it was discharged from the clinker silo to a truck. Further, even when the structure of the conveyor is well drained, there is a problem that the ash transportation efficiency is lowered.
An object of the present invention is to solve the above problems and provide a system for efficiently transporting bottom clinker ash.

(Means for Solving Problems) The above object is achieved by mixing bottom ash having a high water content with dry fly ash to adjust the water content to an appropriate value.

(Function) By mixing dry fine fly ash into a clinker having a high water content and a relatively large particle size, the clinker ash is in a densely packed state and can maintain a uniform and appropriate water content.

Embodiment An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a clinker hopper, 2 is a clinker conveyor, and 3 is a clinker conveyor.
Is a rotary valve, 4 is a fly ash chute, 5 is a silo conveyor, 6 is a clinker silo, 7 is a hydraulic gate, 8 is a pulverized coal burner, 9 is a furnace, 10 is a fly ash hopper, and 11 is a chimney. The clinker and the ash generated by the combustion in the furnace 9 are deposited on the bottom of the furnace 9 and transported to the outside of the furnace 9 by the water-sealed clinker conveyor 2, where they are collected by a collecting means such as a dust collector (not shown). The fly ash is introduced from the fly ash hopper 10 through the fly ash chute 4 into the silo conveyor 5 in a predetermined amount, and fine particles and coarse particles are uniformly mixed. As mentioned above, clinker ash containing a large water content of 10 mm and a large particle size of 10 mm inside and outside is properly mixed with fine fly ash of 200 mesh inside and outside, so that the clinker ash has a uniform and appropriate water content. It is adjusted to a finely packed state of good quality and is sequentially deposited on the upper part of the clinker silo 6 via the clinker conveyor 5. Therefore, such a clinker in a finely packed state in which the water content is uniform and adjusted to an appropriate water content does not generate surface water. Although the collection means and the fly ash and clinker mixing means are not limited to the illustrated embodiment, the mixing ratio of fly ash and clinker is maintained so that the finely packed state with good water retention is maintained in the clinker silo as described above. Is optimally adjusted and controlled according to the traveling speed of the clinker conveyor, combustion conditions in the furnace 9, coal type, and the like.

(Effect of the invention) By carrying out the present invention, transport efficiency is improved without requiring a water draining device for a clinker conveyor, and the water content of the clinker ash is adjusted to a value of approximately 41% or less to generate surface water in the clinker silo. Is gone.

[Brief description of drawings]

FIG. 1 is a layout showing an embodiment of a clinker ash transportation system according to the present invention. 1 ... Clinker hopper, 2 ... Clinker conveyor 3 ... Rotary valve, 4 ... Fly ash chute 5 ... Silo conveyor, 6 ... Clinker silo 7 ... Hydraulic gate, 8 ... Pulverized coal burner 9 ... Furnace , 10 …… Fly ash hopper 11 …… Chimney

Claims (1)

(57) [Claims] 1. A clinker hopper having a water-sealed structure arranged at the bottom of a pulverized coal burning boiler furnace, a clinker conveyor configured in the clinker hopper, and a silo installed from a terminal end of the clinker conveyor to a clinker silo. A clinker ash transportation system having a conveyor, characterized by comprising means for introducing and mixing fly ash from a fly ash collecting means into a starting portion of the silo conveyor, and means for adjusting the water content of the clinker ash by the mixing. Clinker ash transportation system.