JPS6026261Y2 - Constant heat drying incinerator - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention combines a rotary dryer and an upright cylindrical single-stage incinerator equipped with a rotating arm that rotates and blows air into a horizontal layer hearth. The present invention relates to a device, and more specifically, it relates to a device that supplies combustion gas at the outlet of an incinerator to the dryer so that the temperature at the inlet of the dryer is constant, and inputs it as a heat source for the dryer.

[Conventional technology]

Conventionally, a pollution-free treatment device has been proposed for treating sludge, etc., in which combustion gas at the exit of an incinerator is heated by a secondary burner as necessary and sent to a dryer, which is then input as a heat source for the dryer. (Sho 48-74069).

In addition, the combustion gas at the outlet of the incinerator is sent to the drying furnace and input as a heat source for the drying furnace, and the primary and secondary burners of the incinerator are controlled according to the temperature inside the incinerator, and the incinerator A vertical multistage incinerator has been proposed in which the amount of combustion gas fed at the outlet of the incinerator is adjusted (Japanese Patent Laid-Open No. 50-9978).

[Problem that the invention attempts to solve]

However, since the secondary burner of the former processing device is installed in the supply section of the dryer, if a delay in ignition of the secondary burner occurs, the gas containing incompletely burned components sent from the incinerator to the dryer will dry up. There is a risk that the raw material may leak outside through the raw material input port of the dryer before it is completely combusted in the feed section of the dryer, which poses the problem of causing foul odor and pollution.

In addition, the latter multistage incinerator maintains the temperature of the incinerator by igniting both or one of the primary burner and secondary burner installed in different stages, and the amount of combustion gas fed at this constant temperature is controlled. The temperature inside the drying oven is kept constant by opening and closing the temperature control bar of the drying oven, but depending on the condition of the raw materials, the temperature inside the incinerator does not fall below a predetermined temperature. And the calorific value of the secondary burner was set to be high.

Therefore, if both the primary burner and secondary burner, which are installed in different stages of a multi-stage incinerator, are installed in a single-stage incinerator and the raw materials are incinerated by both burners, the raw materials on the hearth will be Due to the heat generated, some raw materials may harden into clinker, causing clinker trouble.

The purpose of this invention is to be able to always supply a constant amount of heat to the rotary dryer without causing clinker trouble in the incinerator, and to ensure that gas containing incompletely burned components is supplied from the incinerator to the dryer. The purpose of this is to prevent foul odor pollution caused by leakage from the raw material input port of the dryer to the outside.

[Means for solving problems]

The present invention is a device that uses combustion gas from an upright circular single-stage incinerator as a heat source for a rotary dryer, and a secondary burner is installed at the top of the incinerator so that the central direction of the flame is directed inside the duct. The secondary burner is automatically controlled by the temperature inside the duct near the entrance of the rotary dryer.

[Effect]

In the foot heat drying incinerator of this invention, when the temperature of the combustion gas in the duct near the inlet of the rotary dryer decreases due to insufficient heat generation in the incinerator, the secondary burner ignites and supplies the gas to the rotary dryer. Always keep the amount of heat constant.

Since the fire force of the secondary burner is not directed at the inside of the incinerator, there is no risk that the raw materials in the incinerator will harden into clinker due to the operation of the secondary burner, and the secondary burner is placed at the top of the furnace with its fire force. Since the central direction is provided along the inside of the duct, incompletely burned components in the combustion gas sent from the incinerator to the dryer are completely combusted.

Example The apparatus of the present invention will be explained based on the embodiments shown in the drawings.

As shown in FIG. 1, raw materials are fed into an inlet 2 of a rotary dryer 1, and dried raw materials are fed from an outlet 3 via a conveyor 4 into a feeder 6 of an upright cylindrical single-stage incinerator 5. .

A hollow shaft 8 protrudes from a hole 14 in the center of the hearth of the incinerator 5, and rotary arms 9 extend radially from the hollow shaft 8.

The hollow shaft 8 is rotated by a drive device 10, and a blower 11 pressurizes air into the hollow shaft 8.

Air is ejected from the blowhole 12 of the rotating arm 9 toward the hearth 7.

A claw 13 provided on the rotary arm 9 transfers the raw material on the hearth 7 to the central hole 14 in a thin spiral.

A conveyor 15 is connected to the central hole 14 to discharge the incinerated raw material to the outside of the furnace.

A primary burner 17 whose flame direction is directed toward the hearth 7 on the furnace wall 16
will be established.

A combustion gas duct 20 is provided from a combustion gas outlet 19 at the top of the furnace to an inlet of the dryer 1, and the combustion gas from the incinerator 5 is used as a heat source for the dryer 1.

A characteristic configuration of the present invention is that a secondary burner 18 is connected to a combustion gas outlet 19 at the top of the furnace and a flame extends along the inside of a duct 20.
A control device 23 including a temperature sensor is installed inside a duct 20 near the sunset of the dryer 1.

The control device 23 automatically operates the secondary burner 18 based on the output of an internal temperature sensor when the temperature of the combustion gas in the duct 20 falls below a predetermined value.

The exhaust air from the dryer 1 is discharged to the outside through a duct 21 and a dust separator 22, and the amount of heat combusted on the hearth is used to discharge the exhaust gas from the dryer 1 to the outside.
When the required amount of heat can be covered, that is, when the temperature inside the duct 20 near sunrise of the dryer 1 reaches a predetermined value, the secondary burner 18 is automatically adjusted (extinguished or castrated).

The raw material is combusted by the oxygen in the air ejected from the rotary arm 9, and is pushed by the claws 13 of the rotary arm 9, spiraling around the hearth 7 and reaching the central hole 14.

When the raw material reaches the central hole 14, it burns up and turns into ash, which falls into the hole 14 and is discharged to the outside via the conveyor 15.

As mentioned above, the fire power of the secondary burner 1B for adjustment of the device of the present invention is not directed at all into the inside of the incinerator 5, so even if the secondary burner 18 operates together with the primary burner 17, the raw material will not be in the form of clinker. It won't happen.

When the amount of combustion heat on the hearth temporarily decreases due to changes in the moisture content, calorific value, etc. of the raw materials, the tact 20 near the entrance of the dryer 1
Although the temperature inside the dryer 1 decreases, the control device 23 operates and immediately activates the secondary burner 18 to compensate for the insufficient amount of heat, so the temperature of the combustion gas input to the dryer 1, that is, the amount of heat is maintained constant.

Once the combustion heat on the hearth is restored, the controller 23 turns off (extinguishes or energizes) the secondary burner 18.

Further, even when the raw material is incompletely combusted, the temperature inside the duct 20 near the entrance of the dryer 1 decreases and the secondary burner 18 is activated immediately.

Since the fire force of the secondary burner 18 extends along the inside of the duct 20, even if the exhaust gas sent from the incinerator 5 to the dryer 1 contains gas containing incomplete combustion components, the secondary burner 18 Since the incompletely combusted components are re-combusted by the ignition of step 18, completely combusted gas is always supplied to the dryer 1.

This prevents incomplete combustion components with a strong burnt odor from leaking outside from the inlet 2 of the dryer 1 and causing foul odor pollution.

Therefore, the heat input to the dryer 1 is stable, and efficient heat production drying can always be performed.

As shown in FIG. 2, instead of installing the secondary burner 18 at the outlet 19 at the top of the incinerator 5, it is also possible to install it in parallel with the duct 20 and draw the flame into the inside of the duct 20.

None of the illustrated embodiments require external fuel to process the feedstock under steady state conditions.

For example, a slurry material with a moisture content of 70% is fed into the dryer 1 at 4.5 times per hour.
When drying to a moisture content of 25% by adding 9 to 000, the required amount of heat is approximately 2.300.000 kcal per hour,
The solid content calorific value of the raw material is 3゜QQQk per ko
cal, the amount of heat naturally generated in the incinerator 5 is 2.00% per hour even after subtracting heat radiation, latent heat of vaporization of residual moisture, etc.
700.0OOkcal, and if the combustion gas is input to the dryer 1, drying and incineration can be performed without auxiliary fuel.

[Effect of idea]

As mentioned above, according to the present invention, in a device that uses combustion gas from an upright cylindrical single-stage incinerator as a heat source for a rotary dryer, the secondary burner is placed at the top of the incinerator in the direction of the center of the flame. By installing a secondary burner along the inside of the duct and automatically controlling this secondary burner according to the inlet temperature of the dryer, it is possible to always supply a constant amount of heat to the rotary dryer, and it is possible to Unlike non-polluting treatment equipment, it does not cause odor pollution due to delayed ignition of the secondary burner, and it has the advantage of not forming clinker-like lumps on the hearth of the upright cylindrical single-stage incinerator. It has a positive effect.

[Brief explanation of drawings]

FIG. 1 is an elevational view, partially in section, of an apparatus according to one embodiment of the present invention, and FIG. 2 is a partial elevational view of another embodiment. 1: Dryer, 5: Incinerator, 7: Hearth, 9: Rotating arm, 16
: Furnace wall, 17: - secondary burner, 18 2nd secondary burner, 19:
Outlet, 20: Duct, 23: Control device.

Claims (1)

[Claims for Utility Model Registration] A rotary dryer, an upright cylindrical single-stage incinerator connected to the dryer, and a duct leading from the combustion gas outlet of the incinerator to the inlet of the dryer. , the incinerator is equipped with a rotary arm that generates fumes while rotating on a horizontal layer hearth, a primary burner, and a secondary burner; The secondary burner is installed at the top of the incinerator so that the central direction of the flame is along the inside of the duct, and the secondary burner is installed inside the duct near the inlet of the dryer. A foot heat drying and incineration device comprising a temperature sensor that detects the temperature inside the duct, and a control device that automatically controls the secondary burner based on the output of the temperature sensor.