JPH02259325A - Waste ignition device having boiler - Google Patents

Abstract

PURPOSE:To enable waste combustion device to be applied to an already installed waste combustion device and further to get a high pressure steam by a method wherein the waste combustion device is constituted by a water-cooled wall having a combustion air injection nozzle forming a waste incinerator wall and a boiler having a water pipe wall positioned within the incinerator of the water-cooled wall. CONSTITUTION:Combustion air is supplied by an air blower 7 to a pipe 11 within a water- cooled jacket (a water-cooled wall) 5 and further injected from a nozzle 12 into a combustion gas within a furnace. A wall 13 of a water-cooled jacket may receive heat from the combustion gas within the furnace, cooling water within a water-cooled jacket 5 increases its temperature to become hot water and then the water is supplied to a hot water tank 8. A water pipe wall 15 in which a plurality of water pipes 15c are connected by an upper header 15a and a lower header 15b may receive heat from the hot temperature gas within the furnace to generate steam so as to cause steam of high pressure to be supplied to a drum 18. A pitch of the water pipe 15c of the water pipe wall 15 is displaced by a half pitch of a pitch of a nozzle 12, resulting in that an amount of heat received by the water-cooled jacket 5 is decreased by half, hot water generation is half reduced. Since this is a composing element of a boiler, it is possible to generate steam of high pressure and further there is no prohibition of injection of the combustion air.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for suitably incinerating waste, particularly polymeric waste, and effectively recovering the waste heat as steam.

<Prior art and its problems> In recent years, there has been an increase in the amount of waste made of so-called polymeric materials such as polyester, reused ethylene, urethane, expanded polystyrene, rubber products, etc., and various incinerators for the waste have been provided.

However, conventional furnaces of this type have a so-called built-in furnace structure in which refractories are piled up. When the above-mentioned polymeric waste is fed into a furnace with such a construction structure and incinerated, the furnace wall becomes high in temperature 1 to 2 hours after being incinerated, and the combustibility improves, causing it to burn all at once and due to lack of air. This causes incomplete combustion. Furthermore, if the amount of air for combustion is increased at this time, the combustion temperature will further rise, combustion will become more active, and black smoke will be generated, and this state will continue.

In order to solve these problems, we have provided a device that surrounds the furnace with a quarter-jacket type water-cooled wall, absorbs the constantly generated high heat into cooling water, maintains a stable combustion gas temperature, and obtains good combustion conditions. has been done. Further 600-600f
3 to 4 with high filHzO head air provided on the peripheral wall
The combustion gas is injected into the furnace through a large number of small holes of 11s3zl and is stirred to achieve a uniform air ratio for smooth combustion.

An example of such a device is shown in FIGS. 2 and 9. code 1
' is a water-cooled jacket type incinerator, which has a refractory bottom part 2', and materials to be incinerated are inputted from a waste supply port 5' having a damper 3 (II'). ' is ignited by the flame and starts combustion.Water cooling jacket 5'
The combustion air supply nozzle 6' has a combustion air supply nozzle 6', and the pressurized air supplied from the blower 7 is blown into the furnace through this nozzle. The water in the water cooling jacket that has absorbed heat is gradually heated to 20 DEG C. to 80 DEG C., and then sent to the hot water tank 8'. Further, while the temperature is low, the water is used as cooling water and is again supplied to the water cooling jacket 5' from the pipe 9'. If necessary, the hot water is drawn out via the pipe 10' and used as in-house hot water.

However, the processing time for incinerated materials (polymer-based) is approximately 400 ky/h.
In cases such as R, about 2000 ky/hr of the hot water is turned into steam and wastefully released into the atmosphere.

For this reason, it is desired to modify existing incinerators so that they can produce pressurized steam and use waste heat more effectively.

For this reason, it is possible to install a waste heat boiler in the exhaust gas flow path, but since the heat is transferred from the combustion gas after the heat has been absorbed by the water cooling jacket, the amount of heat is too small to obtain high pressure steam.

For this reason, there is a need for a proposal for a waste incinerator equipped with a boiler that has a simple structure and meets the regulations for pressure vessels.

<Purpose of the Invention> The purpose of the present invention is to propose a structure of a waste incinerator equipped with a boiler that can be used not only in newly installed waste incinerators but also in existing waste incinerators, and which can produce high-pressure steam.

Summary of Means for Combustion> In summary, the present invention provides an apparatus for incinerating waste and recovering its waste heat, including: a water-cooled wall with a combustion air injection nozzle forming a waste incinerator wall; This is a waste incineration device with a boiler, which consists of a boiler with a water pipe wall located therein.

<Example 1> A first example of the present invention will be described with reference to FIGS. 1 and 2. The incinerator is a longitudinal sectional view of a modified version of the conventional water-cooled jacketed device shown in FIG.

In this drawing, the reference numerals in FIG. 8 except for the dash indicate the same members. In this case, combustion air is supplied from the blower 7 to the tube 11 in the water cooling jacket (water tube wall) 5 and is ejected from the nozzle 12 into the furnace. The wall 13 of the water-cooled jacket receives heat from the combustion gas in the furnace, and the cooling water 14 in the water-cooled inner jacket is heated to become hot water, as in the case of the conventional apparatus.

In this embodiment, a plurality of water pipes 15c connect an upper header 15α and a lower header 156, and are made into a panel-shaped water pipe wall 15 at a factory and can be transported to the vicinity of an existing incinerator.

In this case, the ceiling part 17 of the furnace 16 is formed so that it can be attached to and removed from the furnace 16.

After the lower header 156 is carried into the furnace, it is covered with a refractory material to prevent it from burning out during operation. The upper header 15a is connected to the drum 18 by a conduit 19. Further, the drum 18 and the lower header 156 are connected by a downcomer pipe 20.

The water tube wall 15 receives heat from the high-temperature combustion gas in the furnace, generates steam, and supplies high-pressure steam from the drum 18. The pitch of the water pipes in the water pipe wall 15 is shifted by half a pitch from the pitch of the nozzle 12, so the heat received by the water cooling jacket is halved, and the amount of hot water produced is halved. combustion air can be generated without hindering the jetting out of combustion air.

The hot water tank 8 receives hot water from the water cooling jacket 5, and receives a water level signal from a water level transmitter (not shown) installed in the hot water tank 8, which is connected to the conduit 32 in response to a signal from a water level controller 25. Controls the water supply flow rate control valve 26. The hot water in the overwater tank circulates through the pipe 9 to the lower part of the water cooling jacket through the pipe 9, the water cooling jacket, and the hot water tank due to the water level difference between the water cooling jacket 5 and the hot water tank 8, and the water cooling jacket 5 receiving heat.

In addition, pipes 10. Hot water is sent via a hot water supply pump 27. It also controls the flow rate control valve 31 provided in the pipe line 30 into which the pipe is inserted.

Said water cooling jacket 5, hot water tank 8, pipe line 9.10.
32, flow rate control valve 26.31, hot water supply pump 27
A hot water boiler is formed by the controllers 25 and 29.

In addition, since the water tube wall 15 is located inside the furnace and receives a large amount of heat, the drum 18. Header 15α.

15b, conduit 19. In combination with the downcomer pipe 20, a boiler that generates normal pressure steam is formed.

<Embodiment 2> FIG. 5, FIG. 4, and FIG. 5 show a second embodiment. The ceiling part 117 of the incinerator is shaped to include a combustion gas outlet so that the water pipes connected to the header 51cL do not penetrate through the ceiling part, making it easy to assemble the staggered arrangement and double row type water pipe wall. The combustion gas outlet of the ceiling part 117 is connected to a flue and further connected to a boiler, for example, a smoke tube boiler 21, which recovers the heat retained in the combustion exhaust gas.

The steam generated in the water pipe wall 51 passes through the pipe 24 to the boiler 2.
1. The water cap of the boiler 21 and the lower header 51b of the water pipe wall 51 are connected by a pipe line 120.

FIG. 4 is a partial view of the vicinity of the header 51b when the water pipe walls 51d and 51+ are formed in two rows and the furnace head 51b is located outside the casing 24 of the incinerator.

The injection nozzle 61 for supplying combustion air is connected to the casing 2.
The nozzle is placed in contact with the outer surface of the water pipe 51d on the 4th side so that the nozzle is also cooled.

As shown in FIG. 5, the pitch P position of the water pipe 51d and the water pipe 5
When selecting an appropriate pitch P size by shifting the position of the 1g pitch P by half a pitch, the two rows of water tubes should receive heat from the combustion gas in the furnace evenly, and the combustion air should be ejected appropriately. The high-pressure air-water mixture that is generated is boiler 2.
1, it is possible to suitably absorb heat from the boiler 21, recover waste heat, and generate high-pressure steam.

In addition, in FIG. 3, the bottom part 112 has a plurality of ventilation holes 112α.
It is shaped like a perforated plate with a heating air supply chamber 2 at the bottom.
2 and burner 23, heating of the refractory forming the bottom part 112 and heated combustion gas can be supplied into the furnace from the bottom part 112, making it easy to start up the furnace and ensuring a sufficient supply of combustion air. It can eliminate smoke generation and ensure sufficient combustion.

<Embodiment 3> Figures 6 and 7 show a third embodiment, in which the water cooling wall 51d
In the case of a membrane structure formed by a tube and a membrane bar, a pressure air chamber 64 is formed outside the furnace of a plurality of membranes as shown in FIG. Inject combustion air into the furnace.

FIG. 7 shows an enlarged view of the air injection nozzle 62. The axis of this air injection nozzle is oblique to the surface of the membrane bar, and the water pipe 51g on the water pipe wall inside the furnace is blown to prevent the pipe material from being abraded by the flowing medium.

<Effects of the Invention> By carrying out the present invention, it is possible to obtain a device that simultaneously supplies pressurized steam and hot water through combustion during incineration of waste.

It also has the effect that existing incinerators can be easily modified.

[Brief explanation of drawings]

Fig. 1 is a drawing showing a longitudinal section and piping of a device according to a first embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a diagram showing a second embodiment. A vertical sectional view of the device, FIG. 4 is a partial sectional view when the lower header of the water pipe wall is positioned outside the device, FIG. 5 is a sectional view taken along line B-B in FIG. 4, and FIG. FIG. 7 is an enlarged view of part P of the sixth factor, FIG. 8 is a vertical cross-sectional view of a conventional incinerator, and FIG. 9 is a partially enlarged view of part C of FIG. 8. . 1... Incinerator 2... Bottom 4'... Ignition burner 5... Water cooling jacket (water cooling wall) 12... Reinforcement nozzle 15... Water pipe wall 18... Dora Figure 2 Figure 8 Figure 9

Claims (1)

[Claims] 1. In an apparatus for incinerating waste and recovering the waste heat,
A waste incinerator with a boiler comprising a water-cooled wall with a combustion air injection nozzle forming a waste incinerator wall, and a boiler having a water pipe wall located on the inside of the water-cooled wall. 2. A hot water boiler is formed by connecting a water cooling wall with a combustion air injection nozzle and a hot water tank, and providing a control device to control the amount of hot water supplied, and connecting the water pipe wall and a drum to generate pressure vapor. 2. The waste incinerator with a boiler according to claim 1, wherein the boiler is formed to supply two heat sources of steam and hot water. 3. The waste incinerator with a boiler according to claim 2, further comprising a control circuit for controlling the flow rate of the hot water in a pipe line that returns the hot water to the water supply tank using the temperature of the hot water sent out from the hot water tank as a signal.