JP2564174B2 - Coal rapid pyrolysis equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for rapid thermal decomposition of coal. More specifically, it is possible to industrially obtain high value-added chemical raw materials such as tar oil by rapidly pyrolyzing low-carbon coal using the residual heat of red hot coke without the need for a new high-temperature gas generator. The present invention relates to a rapid coal pyrolysis apparatus.

[Prior Art] Conventionally, a method is known in which coal is pyrolyzed and gasified to be converted into city gas, industrial fuel gas, water gas and the like. To pyrolyze and gasify coal, pulverized coal (pulverized coal) as a raw material and a high-temperature gas for heating to a high temperature,
A method has been adopted in which a pyrolysis reaction product generated by contacting for a short time in a reactor is sequentially separated into char, tar oils, gas and the like and collected (for example, JP-A-57-159886).
(See the official gazette).

JP-A-57-159886 discloses an invention of a method for gasifying coal, according to which a heat source required for gasifying coal is a method for burning a part of raw coal. ,
It is secured by mixing high-temperature recycle char with coal, but it requires high-temperature gas generation equipment for the thermal decomposition reaction.

[Problems to be Solved by the Invention] However, in the above-described method according to the conventional technique, it is necessary to newly provide equipment for generating a high-temperature gas for heating pulverized coal to a high temperature, and therefore the equipment cost only increases. In addition, there is a problem that the running cost in terms of energy for heating the high temperature gas also becomes high.

The present invention solves the conventional problems as described above, reduces the equipment cost of the high-temperature gas generation equipment and the preheating device as much as possible, and also the energy for heating the high-temperature gas for heating the pulverized coal to a high temperature. As a result of earnest studies aimed at providing an industrially advantageous rapid thermal cracking apparatus for coal, which can significantly reduce the cost, an apparatus for rapid thermal cracking of low-carbon coal by utilizing the residual heat of red hot coke The present invention has been completed and the present invention has been completed.

[Means for Solving the Problems] In order to solve the above problems, the present invention is an apparatus for rapidly pyrolyzing coal using the residual heat of red hot coke extruded from a coke oven. Coke receiver that receives red hot coke, a reaction tube that causes the pyrolysis reaction by contacting the red hot coke and the raw coal supplied from the raw coal feeder, and a char separator that separates char from the reaction product of the pyrolysis reaction , And a liquid product separator for separating a liquid product via a cooler are sequentially arranged, respectively, and a rapid coal pyrolysis apparatus is featured.

BEST MODE FOR CARRYING OUT THE INVENTION In the rapid thermal decomposition apparatus according to the present invention, a coke receiver is arranged so as to be connected to a coke oven. The coke receiver serves to receive the red hot coke that has been bitten out of the coke oven. The coke receiver is movable, and a reaction tube is arranged behind the coke receiver. The reaction tube is arranged between the coke receiver and the char separator, and plays the function of bringing the raw coal supplied from the raw coal feeder into contact with the red hot coke and rapidly pyrolyzing the raw coal by the sensible heat of the red hot coke. .

The raw material coal feeder has a function of feeding the raw material coal to a reaction tube which is disposed between the coke receiver and the char separator and which performs a thermal decomposition reaction. The raw coal feeder is located near the coke receiver in the reaction tube.

The temperature in the reaction tube depends on the type of raw coal, but it is 600
It is selected in the range of up to 1000 ℃. If the temperature is lower than 600 ° C, the C-C bond cleavage of the raw material coal is unlikely to occur, and the temperature is 1000 ° C.
If it exceeds, the radical component once produced having a large molecular weight is polycondensed and conversion to char becomes difficult, so that both are not preferable. Particularly preferable in the above temperature range is 650 to 850 ° C.

The raw coal fed from the raw coal feeder is not particularly limited, but low grade coal (subbituminous coal, lignite) such as low coking degree weak coking coal or non-coking coal can be used. Raw coal is preferably crushed to have a large surface area, and the particle size distribution is 80% when the diameter is 3 mm or less.
It is preferably about 200 or less, and particularly preferably 200
About 70% by weight of pulverized coal for boilers is passed through a filter of mesh (74μ).

In the reaction tube, the raw material coal comes into contact with the red hot coke, and is rapidly heated by the residual heat of the red hot coke to cause a thermal decomposition reaction. Cleavage of C—C bond occurs in the raw material coal, resulting in hydrocarbon gas, tar oils, etc. A liquid product is produced. The reaction tube can also be combined with coke cyclic digestion (CDQ) equipment.

The residence time of the raw material coal in the reaction tube varies depending on the temperature of the red hot coke, the type of the raw material coal, the particle size, the type of the target product obtained by thermal decomposition, etc., but can be selected within 10 seconds. The rate of temperature rise of the raw material coal varies depending on the temperature of the red hot coke in the reaction tube and the residence time of the raw material coal in the reaction tube, but rapid heating of about several degrees to 10 ⁶ ° C / sec is suitable.

The reaction products of the thermal decomposition reaction include char, hydrocarbon gas,
Since it contains a liquid product, the reaction product is transferred to a char separator to separate the char, the rest is transferred to a liquid product separator equipped with a cooler to separate the liquid product, and finally the hydrocarbon gas. Can be obtained. Separation / purification of the liquid product is extremely advantageous because the existing chemical product recovery / purification facility installed for the purpose of recovering and refining by-products generated during coke production can be used as it is.

Liquid products such as hydrocarbon gas and tar oil obtained by pyrolyzing with the rapid coal pyrolysis apparatus according to the present invention can be utilized as chemical raw materials.

[Examples] Hereinafter, a rapid thermal decomposition apparatus for coal according to the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the examples described below as long as the gist thereof is not exceeded. .

FIG. 1 is a schematic view of an example of a rapid coal pyrolysis apparatus according to the present invention.

In FIG. 1, the red hot coke discharged from the coke oven (1) is received by a coke receiver (2). After connecting the coke receiver (2) and the reaction tube (3), raw material coal pulverized and adjusted to a predetermined particle size is continuously supplied to the reaction tube (3) through the raw material coal feeder (4), and at the same time. The red hot coke is sent from the coke receiver (2) to the reaction tube (3).

Raw coal comes into contact with red hot coke and is heated rapidly,
The reaction product generated by the thermal decomposition reaction and generated by the thermal decomposition reaction is first transferred to a char separator (5) to separate the char, and the rest is separated into a liquid product equipped with a cooler (7). It can be transferred to the machine (6) to separate and collect the liquid product and finally to collect the hydrocarbon gas via the pressure control valve (8).

[Effects of the Invention] The rapid thermal decomposition apparatus for coal according to the present invention has the following particularly advantageous effects, and its industrial utility value is extremely large.

(1) The rapid coal pyrolysis apparatus according to the present invention utilizes the residual heat of the red hot coke blown out from the coke oven as a heat source necessary for the pyrolysis reaction, and thus does not require new high temperature gas generation equipment.

(2) It also has the advantage that it can be obtained by combining it with the coke dry digestion (CDQ) equipment. Compared to the conventional rapid pyrolysis method for coal, inexpensive low-grade coal, hydrocarbon gas useful as a chemical raw material, tar Liquid products such as oils can be obtained at a significantly low cost.

(3) Furthermore, according to the rapid coal pyrolysis apparatus of the present invention, liquid products such as hydrocarbon gas and tar oil produced by the rapid pyrolysis of coal are recovered as by-products generated during coke production. The existing chemical product recovery and refining equipment for refining can be used as it is for recovery and purification.

[Brief description of drawings]

FIG. 1 is a schematic view of an example of a rapid coal pyrolysis apparatus according to the present invention. 1 ... Coke oven, 2 ... Coke receiver 3 ... Reaction tube, 4 ... Raw coal feeder 5 ... Char separator, 6 ... Liquid product separator 7 ... Cooler, 8 ... Pressure control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-159886 (JP, A) JP-A-59-80492 (JP, A) JP-A-57-205485 (JP, A)

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A device for rapidly pyrolyzing coal by using residual heat of red hot coke discharged from a coke oven, a coke receiver for receiving red hot coke discharged from the coke oven, a red hot coke and a raw coal feeder. A reactor for contacting the raw material coal supplied from the reactor to carry out the thermal decomposition reaction, a char separator for separating char from the reaction product of the thermal decomposition reaction, and a liquid product from the reaction product via a cooler. A rapid coal pyrolysis apparatus, characterized in that liquid product separators for separating coal are sequentially arranged.