JP2890147B2 - Method for producing coal liquefaction product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for producing a coal liquefaction product, and more particularly to a method for continuously transferring sludge accumulated at the bottom of a hydrogenation reaction tower constituting a coal liquefaction facility from the hydrogenation reaction tower. The present invention relates to a method for producing a coal liquefaction product which can be discharged.

[0002]

2. Description of the Related Art There is a coal liquefaction facility for liquefying coal such as lignite or bituminous coal to produce a liquid fuel or the like. As is well known, such a coal liquefaction facility has a structure in which various towers and tanks are connected via pipes. In the tower and tanks, pulverized coal and fine powder are contained. A hydrogenation reaction tower is provided in which a slurry-like raw material obtained by mixing a catalyst and a solvent is supplied, and hydrogen gas is blown upward from a lower portion thereof.

[0003] As shown in FIG. 2 of the hydrogenation reaction tower 1, which is a schematic illustration of a partially omitted configuration, a slurry formed by mixing at least pulverized coal, a finely divided catalyst and a solvent. A raw material supply pipe p for supplying a raw material r in a shape communicates with the raw material supply pipe p.

[0004] A funnel-shaped bottom 1a on the lower side of the hydrogenation reaction tower 1
A hydrogen gas injection pipe 2 for blowing hydrogen gas g upwardly into the inside of the reaction tower body 1 communicates with the lower top portion, and the inclined surface of the funnel-shaped bottom portion 1a has a stagnation area 1c extending over the entire inner side thereof. Sludge discharge pipe 3 for discharging sludge s
Are connected to each other.

The operation of the hydrogenation reaction tower 1 having the above structure will be described below. A slurry-like raw material r is supplied from a raw material supply pipe p into the inside of the hydrogenation reaction tower 1 and a hydrogen gas injection pipe is provided. Hydrogen gas g is blown from 2. Then, the raw material r inside the hydrogenation reaction tower 1 is stirred by the force of the injected hydrogen gas g.

[0006] By such stirring, the pulverized coal in the raw material r reacts with the finely divided catalyst and the solvent to produce a desired useful coal liquefaction product, and together with this, useless sludge s Is also generated.

Next, the coal liquefaction product thus produced is recovered together with the finely divided catalyst from the upper part of the hydrogenation reaction tower 1 and sent to the next step, while unnecessary sludge s is removed from the hydrogenation reaction tower 1. It descends toward the lower funnel-shaped bottom 1a, and grows and stays in a lump in the retention area 1c of the funnel-shaped bottom 1a.

As described above, when the sludge s accumulates in the accumulation region 1c, the sludge s gradually accumulates in the lower part of the hydrogenation reaction tower 1 and not only shortens the residence time of the raw material r inside the hydrogenation reaction tower 1 but also decreases. As a result, since the sludge s stays in the end, the sludge stagnates continuously from the sludge discharge pipe 3 provided in the funnel-shaped bottom 1a together with a part of the coal liquefaction product as shown in FIG. Had been discharged.

Of course, the supply of the slurry-like raw material r, the hydrogenation reaction of this raw material r, the recovery of the coal liquefaction product and the finely divided catalyst, and the discharge of the sludge s are performed in parallel and continuously. Needless to say.

[0010]

However, in the conventional sludge discharge pipe having the above structure, the suction port is provided in the funnel-shaped bottom portion, that is, the stagnation area where the sludge accumulates. The sludge discharge pipe became clogged at the suction port, making it impossible to continuously discharge the sludge that had stayed.Therefore, the continuous operation of the coal liquefaction facility had to be stopped each time. The occupancy rate is decreasing.

For this reason, a large amount of coal liquefaction product is discharged together with sludge before the sludge is formed into a large lump at the expense of a certain amount of recovery of the coal liquefaction product. It cannot be avoided effectively.

Clogging of the sludge discharge pipe mainly relates to the degree of sludge growth and the amount of sludge stagnation in the stagnation area at the funnel-shaped bottom. In this state, it is considered to flow into the suction port of the sludge discharge pipe and form a bridge at this suction port.

In this case, it is considered that clogging of the sludge discharge pipe can be eliminated by increasing the inner diameter of the sludge discharge pipe. However, this results in a large decrease in the recovery rate of the coal liquefaction product. This is not preferable for improving the productivity of the product, and therefore, even if the cause is different, exactly the same result as the decrease in the operation rate of the coal liquefaction facility is brought about.

Accordingly, the present invention provides a method for producing a coal liquefaction product which can discharge sludge more effectively without causing clogging of a sludge discharge pipe, and which can improve the recovery rate of the coal liquefaction product. The purpose is to provide.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. Therefore, the gist of the method for producing a coal liquefaction product according to the present invention is to provide at least a pulverized coal and a pulverized catalyst. The solvent is supplied to the hydrogenation reaction tower, hydrogen gas is blown from the bottom of the hydrogenation reaction tower upward, and the produced coal liquefaction product is taken out together with the catalyst from the top of the hydrogenation reaction tower. At the lower part of the reaction tower, the sludge discharge area opened downward at a location where sludge generated during the hydrogenation reaction stays at the bottom of the hydrogenation reaction tower and is located away from the inner wall of the hydrogenation reaction tower The sludge is continuously discharged by a pipe.

[0016]

According to the method for producing a coal liquefaction product according to the present invention, the inlet of the sludge discharge pipe is separated from the funnel-shaped bottom and the inner wall, which are the accumulation and accumulation area of the massive sludge, so that the large-sized massive Sludge is not sucked, and the clogging rate is reduced.

Further, since the sludge having a small particle size is effectively discharged as described above, the residence time of the sludge is shortened, and as a result, the sludge does not grow into a large particle size. Reduce the incidence of clogging.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydrogenation reaction tower according to the present invention will be described below with reference to FIG. I do.

The structure of the hydrogenation reaction tower is substantially the same as that of the conventional one, and as shown in FIG. 1, the hydrogenation reaction tower 1 is provided with a funnel-shaped bottom 1a at the lower part, and at least this A raw material supply pipe p for supplying a slurry-like raw material r obtained by mixing the obtained coal, the finely divided catalyst, and the solvent is communicated, and hydrogen gas is blown into the inside from the lower top portion of the funnel-shaped bottom portion 1a. Hydrogen gas injection pipe 2 and sludge discharge pipe 3 to be described later.
And are in communication.

The sludge discharge pipe 3 is located at the radial center of the hydrogenation reaction tower 1 and is a massive sludge s over the entire area inside the funnel-shaped bottom 1a at the bottom of the hydrogenation reaction tower 1.
Has a suction opening 3a that opens downward in the vicinity of the upper part of the retention area 1c where the water stays, and is directed upward by a predetermined length and then bent horizontally, and the hydrogenation reaction tower 1 is kept horizontal.
And is led out through the cylindrical body 1b.

The mode of operation will be described below. A slurry-like raw material r is supplied from the raw material supply pipe p into the inside of the hydrogenation reaction tower 1, and a hydrogen gas g is supplied from the hydrogen gas injection pipe 2 in an upward direction. When injected, the raw material r inside the hydrogenation reaction tower 1 is stirred by the force of the jet of the hydrogen gas g, whereby the pulverized coal constituting the raw material r, the finely divided catalyst, and the solvent react with each other. As a result, an intended useful coal liquefaction product is produced, and unnecessary sludge s is produced.

Next, the coal liquefaction product and the finely divided catalyst are recovered from the top of the hydrogenation reaction tower 1 and sent to the next step, while the sludge s descends toward the funnel-shaped bottom 1a of the hydrogenation reaction tower 1. At the same time, it grows in the retaining area 1c of the funnel-shaped bottom 1a and tends to stay in a lump.

However, it is considered that the lump of the sludge s stagnate in the stagnation area 1c is very close to or in contact with the lump s. g and the lump of sludge s rise again while being separated by the agitating action of the upward jet, and the lump and lump of sludge s separated during the ascending flow sequentially flow into the suction port 3a to form one of the coal liquefaction products. Along with the part, it was discharged very smoothly from the sludge discharge pipe 3.

This means that the amount of coal liquefaction product discharged together with the sludge s can be reduced, in other words, an improvement in the recovery rate of coal liquefaction product.

Incidentally, in the present invention, it is desirable to set the sludge discharge speed from the sludge discharge pipe 3 appropriately. That is, the sludge discharge speed depends on the descent speed of the lump of sludge s and the particle size of the lump, but is not less than the flow rate at which the sludge discharge pipe 3 is not blocked, and the recovery rate of the product is deteriorated or worn. It is preferable to set the flow rate within a range that does not adversely affect the flow rate.

As will be understood from the above description, it is possible to avoid the state in which the sludge s cannot be discharged by only slightly changing the configuration of the sludge discharge pipe 3, and it is possible to greatly improve the operation rate of the coal liquefaction facility. become.

In the above, an example has been described in which the suction port 3a of the sludge discharge pipe 3 is located at the center in the radial direction of the reaction tower main body 1. However, the position of the suction port 3a is farther from the inner wall, and the sludge s rises from the bottom. A certain effect can be expected if the distance is within a possible range. Therefore, the scope of the technical idea of the present invention is not limited by the above-described embodiment.

[0028]

As described above in detail, according to the method for producing a coal liquefaction product according to the present invention, the suction port of the sludge discharge pipe is separated from the funnel-shaped bottom and the inner wall, which are the accumulation and accumulation areas of the sludge. Therefore, sludge having a small particle size is effectively discharged, and in addition, the residence time of the sludge in the stagnation area is reduced by such effective discharge, and the sludge is discharged until it grows into a large lump, The rate of clogging of the sludge discharge pipe decreases.

The massive sludge retained in the retaining area rises with the force of the hydrogen gas jet blown from the lower portion of the funnel-shaped bottom, and the sludge lump separates from the sludge. The sludge lump and lump are in turn,
Since it is sucked into the sludge discharge pipe opened downward at a location away from the inner wall of the hydrogenation reaction tower in the sludge retention area, the sludge lump approaches or touches as in the conventional case. As a result, it is possible to reduce the possibility of forming a bridge by being sucked into the sludge discharge pipe as a mass of the state, thereby enabling continuous discharge of the sludge.

Therefore, according to the present invention, in addition to the effect of improving the production efficiency accompanying the continuation of the continuous operation of the coal liquefaction facility, the sludge lump is sucked apart, so that the coal liquefaction discharged together with the sludge Since the amount of the product can be reduced, a great effect can be expected for the improvement of the recovery rate of the coal liquefaction product.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of a hydrogenation reaction tower according to one embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating a partially omitted configuration of a hydrogenation reaction tower according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hydrogenation reaction tower 1a ... Funnel-shaped bottom of hydrogenation reaction tower 1b ... Cylinder part of hydrogenation reaction tower 1c ... Retention area 2 ... Hydrogen gas injection pipe 3 ... Sludge discharge pipe 3a ... Suction port g ... Hydrogen gas p ... raw material supply pipe r ... raw material s ... sludge

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000105567 Cosmo Oil Co., Ltd. 1-1-1, Shibaura, Minato-ku, Tokyo (72) Inventor Nobuo Yamada 2-5 Brownwell, Mowell Porters Road, Victoria, Australia Within Liquidity (Victoria) Beatty Limited (72) Inventor Masaaki Tamura Mowell Porters Road, Victoria, Victoria 2-5 Int.Cl. ⁶ , DB name) C10G 1/06

Claims (1)

(57) [Claims] At least pulverized coal, a finely divided catalyst and a solvent are supplied to a hydrogenation reaction tower, and hydrogen gas is blown upward from the bottom of the hydrogenation reaction tower to an inside of the hydrogenation reaction tower to produce a liquefied coal. The product is taken out from the upper part of the hydrogenation reaction tower together with the catalyst.The lower part of the hydrogenation reaction tower is a sludge retention area which is generated during the hydrogenation reaction and stays at the bottom of the hydrogenation reaction tower. A method for producing a coal liquefaction product, wherein said sludge is continuously discharged at a position distant from the inner wall of the tower by a sludge discharge pipe opened downward.