JPS58123002A - Coal fluidized combustion boiler equipment with coal drier - Google Patents

Abstract

PURPOSE:To eliminate the need for a pulverized coal fine powder treatment equipment for waste gas as well as effectively utilize raw materials by using waste gas from a coal drier as a fluidizing gas for the coal fluidized combustion boiler having the coal drier in front thereof. CONSTITUTION:Wet coal 21 and hot gas 22 for drying are supplied to a coal drier 20, where the wet coal 21 is dried by the hot gas 22 and supplied as a fuel coal 27 to a coal fluidized combustion boiler 23. In this case, the waste gas 24 from the coal drier 20 is supplied as a fluidizing gas 25 to the boiler 23. When the amount of the waste gas is short as the fluidizing gas, the air 26 is introduced for compensation. By this, fuel coal 27 is burned in fluidized state by means of gas blown up from the lower dispersing plate 28 of the boiler, combined with a medium, and at the same time fine coal powder contained in the waste gas 24 is also burned. On the other hand, waste gas 29 from the boiler 23 is treated by primary and secondary dust collectors and discharged through a heat exchanger 32 to the open air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on a coal fluidized smoldering boiler, and is equipped with a coal dryer as a pre-treatment facility for fuel coal, and the coal dryer drys mill coal to a predetermined moisture content. This invention relates to nine coal fluidized combustion boiler I facilities, which are equipped with coal drying equipment for drying and supplying the dried coal to a coal fluidized combustion boiler as fuel.

A conventional example of the above-mentioned equipment is shown in FIG.

In other words, (1) is a ventilation rotary type coal dryer, and 1ii1
1 charcoal (2) and hot drying gas (3) are supplied. Exhaust gas (4) from this coal dryer (1) passes through a dust collector (6) and is then released into the atmosphere. The above constitutes the drying process (6), and the dried coal (7) dried to a predetermined moisture value in the coal dryer (1) is sent to the combustion process (8), and is then sent to the coal fluidized combustion boiler. (9) is supplied with fuel. This coal fluidized combustion boiler (9)
The exhaust gas (from) passes through the secondary dust collector (b), the secondary dust collector (b), and the heat exchanger (b) before being released into the atmosphere.

Air (b) is heat exchanged in the heat exchanger (to),
Then, it is supplied to the right coal flow piece combustion boiler (9) as fluidizing gas or combustion air (2). By the way, the coal moisture value used in the coal fluidized combustion boiler (9) is generally high-humidity low-quality coal in order to maintain a good combustion period.
It is desirable to keep it as low as possible, and it is essential to dry it as a wIi treatment of coal.

In conventional equipment, the temperature of the exhaust gas αQ from the coal fluidized fluid combustion boiler (9) is as high as 300 to 400 degrees Celsius, and from the perspective of energy conservation, heat is exchanged with the boiler supply air to recover the heat, and dust treatment is performed to dissipate it into the atmosphere. are doing. Maku coal dryer (
1) and the coal flow WhfIA firing boiler situation) have traditionally been considered independently, and this rolled coal dryer (1) is equipped with its own exhaust gas treatment equipment, that is, a dust collector (5), to remove dust. Ninety percent is being dissipated into the atmosphere.

Providing a unique exhaust gas treatment facility in this way would lead to a rise in equipment costs, and furthermore, the dry pulverized coal collected by the dust collector (5) would not be supplied as O fuel to the 6-gas fluid combustion boiler (9). This will result in a loss of raw materials. Furthermore, since high-temperature exhaust gas O4 is regulated, thermal confinement becomes large.

The present invention is a nine-coal pre-combustion boiler facility equipped with a coal drying equipment configured as described above, in which the exhaust gas from the coal dryer is used as a fluidizing gas for combustion in a coal fluidized fluidized smoldering boiler O, The exhaust gas from the coal fluidized combustion boiler is passed through a heat exchanger and then released into the atmosphere, and the hot gas obtained by heat exchange in the heat exchanger is used as hot gas for drying the coal dryer. This book provides a coal fluidized combustion wheeler equipment equipped with a coal drying equipment. According to this configuration, it is possible to omit a coal powder treatment equipment for coal dryer exhaust gas, and to effectively utilize 100% of the input raw material. This enables even more stable boiler operation.

An embodiment of the present invention will be described below with reference to FIG. (
2) is a ventilation rotary type coal dryer, and is supplied with a drying hot gas (2) and a drying hot gas (2). The wet coal (2) supplied to the coal dryer is dried to a predetermined moisture content by the drying hot gas passed between the material layers while being rolled and transferred to the discharge port, and is then dried to a predetermined moisture content as fuel. The coal stream # is fed as coal (2) to the combustion boiler (2).

On the other hand, the exhaust gas from the coal drying equipment is supplied to the coal fluidized combustion boiler as fluidizing gas (2). In this case, if the amount of exhaust gas is insufficient as the amount of fluidizing gas, atmospheric air is induced to compensate. The fuel stone is fluidized together with the medium by the gas blown up from the lower dispersion plate 4 of the boiler and combusted in a circular motion.

At this time, fine coal powder contained in the exhaust gas (2) from the stone dryer is also burned in the boiler. Therefore, the exhaust gas treatment equipment of conventional equipment is no longer required, and the yield of raw materials can be improved.
In addition, handling of dry pulverized coal, which is technically complicated, becomes unnecessary. Exhaust gas from the coal fluidized combustion boiler is treated by the secondary dust collector (1) and the secondary dust collector @, and the heat is recovered by the heat exchanger (2) and released into the atmosphere. Moreover, the unburned coal separated from the exhaust gas 4 by both dust collectors G11G(2) can be fed into the coal fluidized combustion boiler again. On the other hand, the heated air obtained by the heat exchanger (2) is supplied to the coal drying equipment as the aforementioned hot drying gas (2).

FIG. 3 shows another embodiment, in which the heat exchanger (2)
A secondary dust collector Ut (b) is provided at the bottom of the boiler, and a storage tank (2) is provided between the coal dryer Il (e) and the coal fluidized combustion boiler head.

According to the present invention described above, since the exhaust gas from the coal drying equipment can be used as fluidizing gas or combustion air for the coal fluidized combustion boiler, the coal powder treatment equipment for the coal dryer exhaust gas, which has been previously described, can be used. This can be omitted, greatly reducing equipment costs, and the dry pulverized coal in the exhaust gas can be used as part of the fuel for boiler combustion, making it possible to use input raw material Q-1001.
can be used effectively. Further, although the temperature of the exhaust gas from the coal dryer is usually as high as 80 to 100°C, by supplying this exhaust gas to the coal fluidized combustion boiler, the gas temperature can be effectively utilized. On the other hand, since the heated air obtained by exchanging heat between the exhaust gas from the coal fluidized combustion boiler and air is used as the hot air for drying the coal dryer, it has the same effect as the heat recovery performed by conventional wheelers. demonstrate. Furthermore, by directly connecting the coal dryer to the coal fluidized combustion boiler, the moisture content of the fuel coal can be made uniform, and stable and good boiler combustion operation can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing a conventional example, FIG. 2 is a process diagram showing one embodiment of the present invention, and FIG. 3 is a process diagram showing another embodiment of the present invention. (B)...Right leg dryer, (2)...ji@charcoal, (E)...Hot gas for drying, kiln/coal fluidized combustion boiler, (To)...Exhaust gas, (E) ...Gas for stream IIIJ conversion, Kan...fuel coal, Kan...exhaust gas, ω...-secondary dust collector, 6I...secondary dust collector, (to)...heat exchange Kishiro Gonin Yoshihiro Morimoto Figure 1 Figure 2 χ Mamoru Figure 3 i

Claims (1)

[Claims] 1. A coal fluidized combustion boiler IIIK is equipped with a coal dryer as pre-treatment equipment for a combustion stone worker, and the coal tlL dryer dries wet coal to a predetermined moisture value, A coal fluidized fluid combustion boiler equipment equipped with coal drying equipment for supplying the coal as fuel to a coal fluidized fluidized combustion boiler, wherein the exhaust gas from the coal imager is used as fluidizing gas or combustion air for the coal fluidized fluidized combustion boiler. The exhaust gas from the coal fluidized combustion boiler is passed through the heat exchanger 11 and then released into the atmosphere, and the hot gas obtained by heat exchange in the heat exchanger is used as hot gas for drying the coal dryer. Coal fluidized boiler equipment equipped with coal drying equipment characterized by the following.