SU1616970A1 - Method of producing water-oil suspension - Google Patents

Abstract

This invention relates to liquid carbonaceous fuels, in particular, to the preparation of a coal-water slurry. The goal is to improve the quality of the suspension and simplify the process technology. The preparation is carried out by grinding wet brown coal with water at 30-90 ° C in the presence of a hydrocarbon additive — preferably, an oil or coal fraction is used, boiling in the range of 350 ° C — кК, 0.5-5.0 wt.% on coal to form a slurry. The latter contains 35-45 wt.% Solids, heated it at 200-300 ° C under a pressure of 15-100 atm in a tubular reactor with a slurry feed rate of 0.1-3.0 m / s followed by a decrease in pressure first to 8- 80 atm and cooling the suspension to 30-90 ° C and then reducing the pressure to 3-10 atm. The method allows to obtain, by continuous technology, a storage-stable coal-water slurry from brown coal with a solids content of 60-70 wt.% And having a viscosity after 30 days of storage 0.53-0.67 versus 1.5-2.5 Pa ^. with by a known method. 1 hp ff, 1 tab.

Description

The invention relates to methods for producing concentrated water-suspension and can be used in pipeline transport for the combustion and gasification of coal.

The purpose of the invention is to improve the quality of the coal-water slurry and simplify the technology eg preparation.

It is preferable to use petroleum or coal products having so-called boiling point as hydrocarbon additives. above, such as oil -. Noah or coal fuel oil, pipolysis resin, hydrogenation residues, used oils.

Try on BurypCh coal (, 8 masl; DG 6.0 wt.%; C 43, 7 wt.%; IP 3,0 wt.%) In an amount of 26.6 kg are mixed with 5 wt.% On coal oil fuel oil ( viscosity is conditional at 75 ° C 30.2 "WU, density 0.985 initial boiling point 357 ° C, containing 1.7 wt.% sulfur; setting temperature) and 23.4 kg of water, carried out by wet grinding at 90 ° C. The resulting suspension, containing 60% by weight of water, is heated in a tubular reactor at a pressure of 100 atm at a speed of 3 m / s up to 300 ° C. Then, the heated suspension enters the high-pressure hot separator, where, at a pressure of VO atm, the vapor-gas stream containing 18.5 kg of water and 0.25 kg of gas of the following composition,% by volume, is removed from the top: CO2 82; CO 3; Ol 15 (excluding nitrogen). From the bottom of the separator, the suspension is withdrawn through a heat exchanger, where it is cooled to 90 ° C and fed to a cold high pressure separator, in which the pressure is released to 10 atm. An additional 4.0 kg of water and 0.08 kg of gas, consisting essentially of COj and CO, are removed from the top of the separator.

Luch suspension containing About wt.% Water. Technological parameters for the preparation of this suspension and its rheological properties are presented in table.

; Examples illustrating the effect of various organic additives, their amounts, conditions of heating and drosse-suspension are given in (table .;

Pyrolysis resin has the following characteristics: a density of 0.880 g / cm N.K. 355 ° C; asphaltenes content; 47 wt.%} Sulfur 1.2 wt.%.

Fractional hydrogenation of brown coal with so-called boiling point (fractional composition bb.%: NK 450 ° С42.7; 450-500 ° С 36.5,; above 500 ° С the rest, density 0.985 g / cm, temperature zastyshanil).

Coal fuel oil has the following characteristics: density 1.075 g / cm; initial boiling point viscosity at 75 ° C; 5; temperature

congealing 25 ° C; the sulfur content of 0.45 wt.%

Spent compressor oil (viscosity at 17 cSt, solids content 1.2 wt.%, Density 0.925 g / cm, n. K. 375 ° C).

When the heating rate of the suspension is lower than 0.1 m / s, no nuuk contact is made between the suspension and the hydrocarbon additive, and when the speed of suspension is higher than 3 m / s, the heating is intensified, which does not ensure that the resulting pores in the carbon are filled with hydrocarbon phase.

The amount of the selected additive of 0.5-5% by weight is due to the fact that when the amount of the additive is less than 0.5% by weight, no hydrophobiz is observed on the coal.

0

five

0

five

0

five

Qi on the surface of the coal, and with the amount of hydrocarbon additive more than 5 wt.%, no special improvement in the hydrophobization of the coal is also observed.

The choice of the cooling interval of 30-90 ° C before the second stage of throttling and the residual pressure after the throttling of 3-10 atm is explained by the fact that it is necessary to ensure that the PLC is resistant to separation and the cost of its transfer.

As hydrocarbon fractions, various hydrocarbon products of petroleum or coal origin with a bale should be used. above. At the boiling point of the additive below 350 ° C, part of this fraction enters the vapor phase, which is removed by throttling in the form of vapor.

Thus, the application of this method of obtaining water-carbon sus-. The penny allows to obtain, using continuous technology, stable during storage of BEADS from brown coal with a solids content of 60-70% by weight and having a viscosity after 30 days of storage 0.53-0.67 Pa C against 1.5-2.5 Pa “With by a known method.

Claims (2)

1. Method of obtaining coal-water slurry by grinding wet brown coal with water at 30-90 s to obtain a suspension containing 35-45 wt.% Solids, heating it at a temperature of 200-300 ° C under a pressure of 15-100 atm, depressurizing after barothermal treatment to 8-80 atm to produce the desired product, characterized in that, in order to improve the quality of the suspension and simplify the process, the grinding of coal is carried out in the presence of a hydrocarbon additive, taken in an amount of 0.5-5.0 mas% for coal, heating carried out in a tubular reactor with a feed rate of suspension O, 1-3, Ohm / s, followed by a decrease in pressure first to 8-80 atm and cooling the suspension to 30-90 ° C and then reducing the pressure to 3-10 atm. 2. Method POP.1, characterized in that a petroleum or coal fraction is used as a hydrocarbon additive, which stands out in the range of C50 to k.