JPH0362755B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Fields] Since vegetable charcoal is a solid with an irregular shape, it is more inconvenient in terms of handling such as transportation and storage than liquid fuel. There is growing interest in the technology of fluidizing and transporting these plant charcoal materials, but there are two
There are two factors. One of these is the transport benefits of fluidized handling, and the other is the expectation for an alternative fuel that is more similar to oil in terms of economic efficiency in the near future. Recently, research has been progressing to develop a mixed slurry of coal and water. The present invention relates to a water slurry (hereinafter referred to as CCWS) made by adding water to vegetable charcoal, and a method and apparatus for producing the same. [Prior art] There are various methods of crushing solid materials such as coal as shown in Table 1, but in addition to the lack of economical crushers, it is difficult to reduce the particle diameter to 100 microns or less. was. Carbonized plant matter has not been industrialized, but it is similar on a laboratory scale.
However, since it is easier to crush than coal, it has the advantage of slightly lower power consumption. Using this fine powder, water and dispersion stabilizer,

【table】

[Table] (Note) - Items marked are promising for producing ultrafine particles.
A water slurry can be produced by mixing under these conditions.
Recently, studies have begun to consider methods of simultaneously performing pulverization and slurrying. The diagram below simply shows the conventional technology for making water slurry from coal in the following three ways.
(There is no technology for making water slurry from carbonized plant matter.)

[Problems to be solved by the present invention]

In commercially available crushers such as those mentioned above, the process leading to slurry formation is two or three stages, and the particle size of the granules does not become less than 100 microns, so the melting machine (mass coloder) has been improved and improved. 20 in process
The present invention is characterized by the discovery of a manufacturing method for pulverizing it into particles of micron size or less and making it into an aqueous slurry. We focused on improving the upper and lower two grinders that are the heart of the product name Mascolloider, which can be said to be a representative melting machine, and developed the Vitrified Grinder (Whetstone).
This polymer composite vitrified grinder (trade name: Grindel) was attached to a mass colloider to continuously finely grind the carbonized plant matter to 20 microns or less over a long period of time. Now that water and a dispersant have been added, fine pulverization and stable carbide and
A method for producing water slurry was developed. As a result, power consumption is low, and manufacturing costs are 1/2 to 1/5 of those using the various crushers shown in the table.
It was moderately hot. When judged as a total system, it was found that the one-step manufacturing method greatly contributed to improving productivity. [Means for solving the problem] The gist of the present invention is that 0.8 to 1.2 parts by weight of water and/or alcohol (vegetable char: water and/or The present invention relates to a vegetable carbide water slurry characterized by containing alcohol (=55:45 to 45:55), a method for producing the same, and an apparatus for producing the slurry. CCWS is a yield-value pseudoplastic fluid that exhibits ticnotropic behavior, but various factors influence the production of CCWS with high concentration, fluidity, and stability. The main factors are:
The basic physical properties of carbonized plant matter, the particle size distribution of carbide, dispersants, etc., and the manufacturing process using a melting and crushing machine. First, its basic physical properties are that unlike coal, it is porous and can absorb moisture.
The basic physical properties of coal vary greatly depending on its production area, but
Carbonized plant matter shows almost the same value without being greatly affected by the type of plant, carbonization conditions, etc.
Since it contains almost no impurities such as sulfur and other organic substances, quality control is easy. Next, regarding particle size and particle size distribution, when pulverized using a mass colloid, the particle size distribution is mostly between 20 and 10 microns compared to coal, and the yield in this range exceeds 90%. Since the particle size of the carbide particles was uniform, a highly stable water slurry could be produced. Next, regarding dispersants, there are two methods for dispersing solid particles, such as carbonized plant matter, in a liquid. Some polymers bind (or adsorb) to produce steric repulsion. By adjusting the particle size distribution, it is possible to increase the concentration (referring to the weight ratio of carbide to water, when the ratio of carbide is high), but as it is, it is difficult to maintain good fluidity.
CCWS is not available. Therefore, a small amount of dispersant is required to provide fluidity. Anionic and nonionic dispersants are mainly used. The anion type mainly charges the surface of the carbide particles negatively and provides a dispersion effect by repelling the surface charge. In addition, nonionic materials have a dispersing effect mainly due to steric hindrance of long molecular chains. Note that anionic compounds can have both effects by polymerizing them. Most dispersants for coal/water slurries can be used as the dispersant used in the present invention. Among them, anionic NoF-1-W manufactured by Nihon Yushi Industries (KK)
and NoF-6-W are inexpensive, and when added up to 1% in pure terms based on the carbide weight,
Stable for about 2 weeks. Stability varies slightly depending on the addition method. The best method of addition is to spray the aqueous dispersant solution in several portions in the form of mist. It was also confirmed that if added all at once, the production time would be about twice as long. Another feature is that the dispersant does not need to be selected or added in an appropriate amount depending on the brand of carbide, manufacturing method, etc. However, although some consideration must be given to PH, temperature dependence, history of shear resistance layers, etc., this does not determine the manufacturing method. In order for carbide particles to remain stable without settling for a long time, they must be stabilized by mutual dispersion of the particles and by a network structure formed by the particles (weak aggregates). However, dispersion stabilization and stabilization by weak aggregates are contradictory, and skillful control was the key to technological development.
It has been found that producing a water slurry is highly stable, and all of these problems have been solved. [Function] Fig. 1 shows a schematic diagram of the carbide/water slurry production process, which will be explained below. A dispersion stabilizer with a purity of 50% for 30 kg of bark charcoal containing 7% moisture as a carbide (water content becomes 2.1 kg).
Add 27.9 kg of water to 0.558 kg, stir well with a mixer, and add the aqueous solution to the carbide. In this state, the weight of water is 1 per weight of carbide, and the pure concentration of the dispersant is equivalent to 1% with respect to the weight of carbide. When water mixed with a dispersant is added to the carbide and kneaded for several minutes using a ribbon mixer, a kneaded product weighing approximately 113 kg is obtained.
This kneaded material was pushed into the first mass colloider equipped with a polymer composite grinder using a screw pushing device, with a clearance of 0.06 m/
m, and while the kneaded body is melted, the carbide and water are integrated by the action of the dispersant to form a slurry. This slurry is sent through a pipe and pushed into the No. 2 mass colloider, with a clearance of 0.01m/m.
Adjust to. The ability to adjust the clearance to 0.01 m/m is the basis of the present invention. Second
CCWS discharges continuously from the exit of the unit. The carbide particle size distribution in this slurry is shown below. Moreover, the viscosity was 5500 cp.

[Table] The weight of the carbide/water slurry obtained at this time is approximately
It weighed 56.4Kg. The volume is 43. Also, the specific gravity was approximately 1.3. Fig. 1 shows a schematic diagram of the carbide/water slurry manufacturing process, and below, carbide/alcohol (CCAS) will be explained. Charcoal powder, which is treated as waste at steel factories, contains around 12% water. Add 100 kg of ethyl alcohol with a moisture content of 20% or less to 100 kg of this carbide (water content is 12 kg), and add sodium alkyl ether sulfate with a purity of 98% and a purity of 95%.
Add 1 kg (equivalent to 0.5% of the total weight) of a dispersing/stabilizing material made by mixing sodium α-olefin sulfonate at a weight ratio of 1:1, and mix the polymer composite Grindel using a screw pushing device. When the charcoal-alcohol mixture is pushed into the built-in No. 1 mass colloider and adjusted to a clearance of 0.06 m/m, the charcoal-alcohol mixture is melted, and the charcoal and ethyl alcohol are combined by the action of the dispersion and stabilizer to form a slurry. When this slurry is sent through a pipe to the No. 2 mass colloider, which has a clearance adjusted to 0.01 m/m, the carbide is further pulverized and a stabilized carbide/alcohol slurry (CCAS) is continuously discharged from the discharge port. . The carbide particle size distribution in this CCAS is shown below. Moreover, the viscosity was 4200CP.

〔Example〕

A specific example will be described in detail below based on FIG. We will explain the manufacturing method and equipment for CCWS, which uses carbonized industrial waste (mainly waste paper) as raw material. First, the carbide is coarsely pulverized using two machines A (with a pulverizing capacity of 30 [Kg/Hr] when using a 0.1 [m/m] screen), and each 30 kg of the raw material carbide is coarsely pulverized. Carbide is sent to the main body in appropriate amounts by A-1, and is crushed by the engagement of A-3 installed in A-2, which moves at 4500 [r・p・m], and A-4, which is fixed to A. is,
It is discharged through A-5 of 0.1 [m/m]. The voltage consumed by one unit at this time is 200V (3 phases), and the current consumption is approximately 7 [AH]. On the other hand, 25.8 kg of water, dispersion stabilizer manufactured by NOF Industries KK, nonionic NoF-6-
Weigh out 0.558 kg of W (50% pure solution), mix well with a simple stirrer, and store (make 2 batches in advance). Next, 30 kg of the carbide powder pulverized in A was put into two machines B whose openings were closed by B-1, and then one dose of the dispersion stabilizer aqueous solution was uniformly put in, and then
-2 was closed and mixed for about 8 minutes by B-3 operating at 55 r.p.m. 43 each, a total of 86 (about 113 kg) primary CCWS were manufactured. The voltage consumption of this one unit is 200V (3 phase) and the current consumption is 5AH. The slurry produced in B-1 is discharged cleanly by opening the hole in B-1 and turning on the switch. Next, the slurry is attached to C (100
[Kg/Hr] ability) is sent to D. The voltage consumption of C is 200V (3 phases), and the current consumption is 0.7 [AH]. For D, adjust the clearance in advance. Close D-2 with the switch OFF,
Firmly lock D-3. Turn D-4 and D-
The point where D-6 comes into contact with 5 and D-4 remains stationary is set as 0 point, and the clearance for pre-processing pulverization is 0.06.
Set to [m/m] (3 scales) and lock. When D is turned on, D-6 is 1450 [r・p・m]
113 kg of CCWS was produced in about 52 minutes, and D
- Emitted from 7. This consumption voltage is 200V (3
phase), the current consumption is 4.0 to 4.4 [AH]. this
CCWS also has a finishing clearance of 0 to 0.01m/
The carbide grain size is 20.
A stable CCWS can be obtained that is adjusted to below microns. This current consumption is 3.6 to 3.9 [AH].
The particle size of the CCWS finally obtained was 6500 cp. Also, when calculating the running cost from the power consumption, it was 0.2 yen/Kg. The particle size distribution of this CCWS is shown below.

[Effects of the present invention]

Grinding carbide using a dry method consumes a lot of power and may involve risks such as explosion.
It is also associated with human health problems such as surrounding dirt. Therefore, pulverization using a wet method is being considered. However, it is very difficult to reduce carbide particles to 20 microns or less, and obtaining such fine particles requires high processing costs. Recently, the CCS concept (coal cartridge system) has been proposed, and a new CCCS concept (charcoal cartridge system) is being considered. In particular, the production of CCWS using carbonized combustible materials from municipal garbage and industrial waste as raw materials is considered an important technology for the 21st century. In order to satisfy this concept, it is necessary to develop a system and equipment that can miniaturize carbide particles and produce a water slurry in one step. As a result of the present invention, by using this system, any production system can be set up at low cost, from small scale to large scale, at the site where carbide is produced, which is a major pillar in promoting resource and energy conservation. In the present invention, it has been confirmed that not only water slurry but also carbide and alcohol slurry can be produced using alcohol (ethyl, methyl, etc.) instead of water. This means that alcohol and finely divided carbide can be transported efficiently at the same time, and when importing carbide and alcohol from overseas, high concentrations can be transported, which can be expected to be economical.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the process for producing a carbide water slurry of the present invention. FIGS. 2A and 2B are an overall view and a sectional view showing essential parts of the apparatus for producing carbide water slurry of the present invention. The corresponding numbers and abbreviations in the drawings are as follows.

【table】

Claims (1)

[Claims] 1. 0.8 to 1.2 of water and/or alcohol per 1 weight of vegetable charcoal crushed to 50 microns or less
A vegetable carbonized slurry characterized by containing parts by weight. 2. A method for producing a vegetable charred slurry, characterized in that the vegetable charred material is continuously ground to a particle size of 50 microns or less, and at the same time, the amount of water and/or alcohol is in the range of 0.8 to 1.2 parts by weight per 1 part by weight of the vegetable charred material. 3. A plant charred material slurry production device comprising a pulverizing device made by combining a grinder inside a melting machine with a polymer, and capable of simultaneously pulverizing the plant charred material and slurrying it in one step.