JPS5924009A - Rotary dryer or dry distillation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary dryer for carbonization gas used primarily for drying aggregate in asphalt plants.

The rotary dryer that dries bones in asphalt plants used ordinary heavy oil as a heat source, but instead of petroleum, which is 81 times more expensive, the rotary dryer that dries bones is used as a heat source.
, gaseous fuels such as city gas, and solid fuels such as coal and coke have been partially introduced.

By the way, recently, from the viewpoint of energy cost and resource reuse, it has been considered to use carbonized gas from old tires, which is more advantageous than the gaseous fuel or solid fuel mentioned above. Since it is not easy to adjust the time and time, it is limited to one type, such as aluminum melting furnaces and hot water boilers, which do not require this, and the water content fluctuates widely, and the set temperature is ±5 degrees Celsius This could not be used in a rotary dryer for drying aggregates, which requires high heating accuracy.

The present invention utilizes a primary air injection nozzle which blows out air sent from an air supply pipe to a combustion chamber connected to a carbonization gas generating furnace through a communication duct, and sends carbonization gas to the combustion chamber (from the combustion chamber) using the Venturi effect. In addition, a secondary air feed pipe is provided to send outside air into the combustion chamber, and a discharge duct is provided in the communication duct, and a gate valve and a control valve are individually provided in the communication duct and the discharge duct. An object of the present invention is to provide a low dryer which solves the problems, can quickly reduce the heating temperature to a fine 814 degrees, has a low energy cost and is economical, and uses carbonization gas from old tires as MViN. Hereinafter, the present invention will be explained in detail with reference to the drawings.

The attached drawings show one embodiment of the present invention, and in the drawings, reference numeral 1 indicates a rotating cylinder. This rotary cylinder 1 is well known and has an input port 1a for dry materials such as aggregates at one end and a discharge port 1b at the other end. In addition to lowering the discharge port 1b, the annular rail 2 wrapped around the outer circumference f of the rotating flow 1 is fixed to a support base 4.
It is placed on two rollers 3 and supported obliquely on a support base 4, and is rotated in the circumferential direction by a drive device (not shown) 1. The portion 1 of the input port 1a includes a conveyor device v5 such as a belt conveyor that feeds dry materials such as aggregate into the rotary cylinder 1 from the input port 1a, and discharges exhaust gas that has worked to heat the dry material to the outside. Exhaust duct 6
A combustion chamber 7 is connected to a portion 1 of the exhaust port 1b. This combustion chamber has a secondary air injection nozzle 8.
A secondary air supply pipe 9 is connected by a connecting duct 11 (+j4 and a connecting duct equipped with a gate valve 15 to a well-known carbonization gas generating furnace 10 for carbonizing old tires).

The injection nozzle 8 powerfully injects the primary air into the combustion chamber 7F, and uses the Venturi effect 1 generated at this time to send the carbonized gas to the combustion chamber 7 and burn it.
An air supply device 14 (table connected 1. 1
A discharge duct 17 equipped with an on-off valve 16 for releasing the carbonized gas is provided between the pipes 5 and 5, and an on-off damper 18 is provided on the feed pipe 9. Discharge port 1 of the rotating cylinder 1
In part b, there is an external IJt sensor 19 that detects the temperature of dry materials such as the discharged materials f'1., and a valve 12 and a gate. Valve 1
5. The on-off valves 16 are individually provided with control values d20, 21.22 that directly or indirectly receive commands issued from the 1h4V sensor 19 and control their opening and closing, while the conveyance device, 15 is provided with a device 23 which directly or indirectly receives commands issued from the γ illuminance sensor 19 and controls the amount of dry material such as slag material thrown into the rotary cylinder 1. .

Next, the operation of the carbonization gas rotary dryer of the present invention constructed as described above will be explained.

Activate the air supply system d14 to inject primary 2-ton air from the injection nozzle 8.
The carbonized gas from old tires generated in the carbonized gas generator 1O is pumped into the combustion chamber 7 together with primary air by the Venturi effect. Dry materials such as aggregates are fed into the rotating cylinder 1 from the conveying device 5 while being burnt.Due to the above operation, the aggregates etc. do not roll inside the rotating cylinder 1 and are not moved. After drying, one piece is taken out from the outlet 1b.

During the first period of operation, dry materials such as aggregates are charged into the rotary cylinder 1 in a quantity slightly smaller than the supply meter matched to the heat source, and the discharge duct 1 is
When the opening/closing valve f'16 of 7 is fully closed, the gate valve 1
5 is fully opened (the entire amount of the carbonized gas generated by the carbonized gas generating furnace 101 is combusted in the combustion chamber 7.

Therefore, the temperature of the dry material discharged from the discharge port 1b becomes somewhat higher than the predetermined temperature, but this is due to the temperature sensor 19.
by fir met 3 sai 9. Immediately, the gate valve 15 is slightly closed and the on-off valve 16 is opened to allow some of the carbonized gas to flow through the discharge duct 171 to reduce the amount of combustion in the combustion chamber 7.At the same time, the aggregate, etc. As a result, the temperature of the dry material discharged from the discharge port 1b decreases.When the temperature of the dry material falls below the predetermined temperature, the on-off valve 16 is fully closed again. death,
The gate valve 15 is fully opened to combust the entire amount of carbonized gas in the combustion chamber 7 to increase the degree of combustion, while reducing the input amount of drying material to return to the original foreshadowing of the operation. Thereafter, the above procedure is repeated to maintain the drying drum at a predetermined temperature l (range 1), but it is also possible to change the drying temperature by changing only either the carbonization gas ht or the input amount of drying material. When adjusting the combustion state of the carbonized gas, it is done by operating the I4 section valve 12 and the opening/closing damper 18 (by adjusting the flow of the primary air and secondary air).

It should be noted that it is uneconomical to release one carbonization gas into the atmosphere, so %J131'/? S, discharge duct 17
It is connected to water heaters etc. that can be heated safely.

As explained above, since the carbonized gas carbonization dryer of the present invention uses carbonized gas from old tires as a heat source, it is economical with low energy costs.
Temperature adjustment can be done quickly and easily using the gate valve installed in the connecting duct and the opening/closing valve installed in the discharge duct. Can be dried efficiently.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of the rotary dryer of the present invention, Fig. 2 is a cross-sectional view showing the relationship between the combustion chamber, the injection nozzle, the gate valve, etc., and Fig. 3 is It is a top view showing the relationship between a communication duct and a discharge duct. 1...Rotating surface, 1a...Input port, 1b
...Discharge port, 4...Support stand, 7...
...Combustion chamber, 8...Injection nozzle, 9...
Feed pipe, 10...Dry 1■ Gas generator, 1
1... Connection duct, 12...) Control valve, 13... Air supply pipe, 15...
Gate valve, 16...1i11 closed, 17...
...Discharge duct. Applicant: Niigata Iron Works Co., Ltd. Sada Construction Co., Ltd., 1.

Claims (1)

[Claims] It has an inlet and an outlet for dry materials such as aggregates, and is placed on a support stand (
A combustion chamber connected to a carbonization gas generating furnace via a communication duct is connected to the rotating cylinder that is rotatably supported in the circumferential direction.
ll, The above-mentioned communication duct (this is also provided with a gate valve), and the above-mentioned combustion chamber is injected with carbonized gas by the Venturi effect to combust air sent from the air supply pipe to the combustion chamber. A (+lf) injection nozzle for primary air to be sent out and a feed pipe for secondary air to send outside air into the combustion chamber are provided, and the air feed pipe is provided with a control valve.
A rotary dryer for carbonized gas, characterized in that a discharge duct having an opening/closing angle of 9'F is provided between the carbonized gas generating furnace and the gate valve of the communication duct.