JPS6089616A - Incinerating device for heavy oil ash - Google Patents

Abstract

PURPOSE:To facilitate operation, to make a device compact, and to improve the quality of incinerated residues, by a method wherein a line which returns residues, collected by a cyclone and a bag filter, to a fluidized bed, is disposed. CONSTITUTION:Residues, stowed in a residue preliminary hopper 34, are discharged by a feeder 36, are conveyed to a line 38 by means of a compressed air generated by an air compressor 22, and are blown in a fluidized-bed furnace 27 through a 3-way switch valve 25 which selects the direction of the feeder 36. The blow-in residues are incinerated in the fluidized-bed furnace 27, and exhaust gas, contained by the residues, is exhausted to the outside of a system through a cyclone 28, a heat exchanger 30, a bag filter 31, and an exhaust gas fan 32. Meanwhile, the residues, collected by the cyclone 28 and the bag filter 31, are conveyed by a conveyor and are stowed in a residue hopper 35.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incinerator that can be applied to the treatment of heavy oil ash or all incinerated materials that can be incinerated in a fluidized bed furnace, and at least
This invention relates to the improvement of an incineration device for heavy oil ash, etc., which is equipped with a fluidized bed furnace, a cyclone, a heat exchanger, and a bag filter, and these are connected in that order.

The ducts generated in heavy oil-fired boilers are collected using electrostatic precipitators, etc., but in order to facilitate the disposal of the ducts (hereinafter referred to as the heavy oil method) and to recover the valuable materials they contain, it is generally incinerated. storage processing is being carried out. Various types of incineration processes have been developed, one of which is the fluidized bed incineration method.

As shown in FIG. 1, the conventional heavy oil ash incineration equipment used to carry out this fluidized bed incineration process includes a heavy oil ash hopper 1, a fluidized bed furnace 5, a cyclone 6, and a heat exchanger 8. and the bag filter 9 are connected in this order, and the cyclone 6 and the bag filter 9 are connected to the auxiliary combustion furnace 11, in other words, it is composed of a fluidized bed furnace system and an auxiliary combustion furnace system. It is something.

In this heavy oil ash incinerator, as shown in Fig. 1, a fixed amount of heavy oil ash held in a heavy oil ash hopper 1 is discharged by a feeder 3, transferred to a pipe line by compressed air obtained by an air compressor 2, and then transferred to a fluidized bed furnace. Inject into the sand layer part 5.

On the other hand, in this incinerator, air is introduced into a heat exchanger 8 by an air fan 7, and the air heated by this is boosted in pressure by a high-pressure blower 4 and blown into a fluidized bed to bring the sand into a fluidized state at a high temperature. I'll keep it.

The above-mentioned heavy oil ash is blown together with compressed air into the sand layer which is in a fluidized state at a high temperature adjusted in this way, and is heated and ignited. The ignited heavy oil ash burns and passes through the space (freeboard section) in the fluidized bed furnace 5, whereupon the combustion is completed and most of the residue is collected by the cyclone 6, and the exhaust gas containing the residue is It exchanges heat with air in a heat exchanger 8 and reaches a bag filter 9. This bag filter 9 collects most of the residue in the exhaust gas, and the exhaust gas passes through the exhaust gas fan 1° as a clean gas to exit the system.

The residue collected by the cyclone 6 and bag filter 9 still contains unburned matter, so it is sent to the auxiliary combustion furnace 11, where the unburned matter is incinerated, and the residue is transferred to a conveyor or the like. The residue is transferred and stored in the residue hopper 12.

The residue stored in the residue hopper 2 is transferred to the residue discharger 1.
3, it is discharged from there and packed into bags.

However, this heavy oil ash incinerator has two problems: firstly, it is complicated because it has an auxiliary combustion furnace system, and secondly, it is difficult to burn heavy oil ash, which is difficult to burn, and heavy oil ash with a high carbon content. Therefore, the quality of the residue does not improve even if incineration is performed in both the fluidized bed furnace 5 and the auxiliary combustion furnace 11. Third, in the auxiliary furnace, most of the residue is burned while floating, so the residue is not absorbed by the exhaust gas. As a result, the load on the bag filter 9 increases.

The present invention was made in view of and to solve the problems of the conventional technology, and by eliminating the auxiliary combustion furnace system, it is possible to simplify the operation, make the device more compact,
The purpose of the present invention is to provide a new incineration device for heavy oil ash, etc., which can improve the quality of incineration residue.

In order to achieve this objective, the heavy oil ash, etc. incineration apparatus of the present invention is equipped with at least a fluidized bed furnace, a cyclone, a heat exchanger, and a bag filter, and these are connected in that order. In the incinerator, a line was installed to return the residue collected by the cyclone and bag filter to the fluidized bed furnace. The present invention is characterized in that it is configured such that after incineration of 1 day's worth, the residue is incinerated again in the same fluidized bed furnace system.

Hereinafter, the present invention will be described in detail with reference to illustrative embodiments.

FIG. 2 shows a system diagram of the heavy oil ash incinerator according to the present invention, 21 is a heavy oil ash hopper, 22 is an air compressor, 23 is a gate valve for selecting the compressed air system, and 24 is a feeder for rotary pulp. It is designed to emit a fixed amount using a device such as an ejector, etc., and then feed it using an ejector or the like using compressed air. 25 is a three-way switching valve for selecting the supply route of heavy oil ash or residue, 26 is a high-pressure blower, 27 is a fluidized bed furnace, 28 is a cyclone, 29 is an air fan, 30 is a heat exchanger, 31 is a bag filter, 32 is a The gas fan 33 is a distributor that selectively distributes the residue to a residue preliminary hopper 34 or a residue hopper 35. Reference numeral 36 denotes a feeder, which discharges the residue from the residue preparatory hoppers 3 and 4 in a fixed amount using a rotary valve or the like, and feeds the residue using an ejector using compressed air. 37 is a residue ejector. 38 is a line, one end of which communicates with the feeder 36 and the other end of which communicates with the three-way switching valve 25.

Next, the operation of the heavy oil ash incinerator constructed as described above will be explained according to the incineration process with reference to FIG.

In this heavy oil ash incinerator, the heavy oil ash held in the heavy oil ash hopper 21 is discharged by the feeder 24, and the air compressor 2
The compressed air obtained by 2 is injected along the line into the sand bed section of the transfer 1-fluidized bed furnace 27. At this time, the three-way switching valve 25 selects the direction of the feeder 24.

On the other hand, in this incinerator, air introduced by an air fan 29 is heated in a heat exchanger 30, and after being boosted in pressure by a high pressure blower 26, it is blown into the sand portion of a fluidized bed furnace 27 to keep the sand at a high temperature and in a fluidized state. I'll keep it.

The above-mentioned heavy oil ash is blown together with compressed air into the sand layer which is in a fluidized state at a high temperature adjusted as described above, and is heated and ignited in the sand layer. The ignited heavy oil ash is combusted\, and the fluidized bed furnace 2
The combustion is completed while passing through the 7 reli board part of 7, most of the residue is collected by the cyclone 28, and the exhaust gas containing the residue exchanges heat with air in the heat exchanger 30 and is sent to the bag filter 31. reach.

Most of the residue in the exhaust gas is collected by this bag filter 31, and the exhaust gas becomes clean gas and is sent to the exhaust gas fan 32.
is discharged from the system.

The residue collected by the cyclone 28 and bag filter 31 is transferred by a conveyor or the like and stored in a residue preliminary hopper 34.

The residue stored in the residue preliminary hopper 34 contains a considerable amount of unburned matter. This residue containing unburned matter is further incinerated in the following steps in order to reduce its volume and improve its quality.

That is, the residue stored in the residue preliminary hopper 34 is discharged by the feeder 36, and the compressed air obtained by the air compressor 22 is used to transfer it to the line 38, and the three-way switching valve 25 selects the direction of the feeder 36. Through the fluidized bed furnace 27
Infuse into.

Thereafter, the blown residue is incinerated in the fluidized bed furnace 27 as described above, and the exhaust gas containing the residue is incinerated in the cyclone 2.
8, heat exchanger 30, bag filter 31, exhaust gas fan 3
2 and then discharged from the system.

On the other hand, the residue collected by the cyclone 28 and bag filter 31 is transferred by a conveyor or the like and stored in a residue hopper 35.

The residue was incinerated twice in the fluidized bed furnace 27, so
It contains almost no unburned matter, has a reduced volume, and has improved quality.

As described above, the heavy oil ash incineration apparatus of the present invention is equipped with at least a fluidized bed furnace, a cyclone, a heat exchanger, and a bag filter, and these are connected in that order. In this incinerator, a line is provided to return the residue collected by the cyclone and bag filter to the fluidized bed furnace. Since it only uses a bed furnace system, the process is simple and the equipment is compact, resulting in fewer troubles, easy operation, and extremely stability. For materials, the desired quality of residue can be achieved by repeating the incineration process two or more times.

Furthermore, materials to be incinerated that are easily combustible only need to be incinerated once, resulting in energy savings. Thirdly, since the load on the bag filter is reduced, the bag filter can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional heavy oil ash incinerator, and FIG. 2 is a system diagram of a heavy oil ash incinerator according to the present invention. 21... Heavy oil ash hopper, 22... Air compressor, 23...
Gate valve, 24... Feeder, 25... Three-way switching valve, 26
・・High pressure proir, 27・・Fluidized bed furnace, 28・・Cyclone, 29・・Air fan, 30・・Heat exchanger, 31・・
Bag filter, 32...Exhaust gas fan, 33...Distributor, 34...Residue preliminary hopper, 35...Residue hoist/:, 3
6... Feeder, 37... Residue discharger, 38... Line.

Claims (1)

[Claims] At least, in an incinerator for heavy oil ash, etc., which is equipped with a fluidized bed furnace, a cyclone, a heat exchanger, and a bag filter, and these are connected in that order, the residues collected by the cyclone and the bag filter are An incineration device for heavy oil ash, etc., characterized by being equipped with a line for returning it to a bed furnace.