JPS62170820A - Measuring method for coal slurry by weighing sampler - Google Patents

Abstract

PURPOSE:To exactly grasp a transfer quantity of a coal slurry by measuring a sampling capacity, a coal slurry capacity and a coal slurry weight and deriving an apparent specific gravity of the coal slurry, and thereafter, expressing a capacity value in terms of a weight value. CONSTITUTION:As for a coal slurry which has been collected to a sample receiver 6 through a valve 6a, its weight W1 is measured by a load cell 6b or a balance, and a capacity V1 of the coal slurry is measured by a liquid-level meter 6c, etc. Water of a tank 7 of a capacity corresponding to a total quantity of the quantity of said collected coal slurry and the quantity of mixed gas is transferred to a weighing tank 8 through a line 7b, weight W2 of water is measured by a load cell 8a or the balance, and a total sample quantity V2 containing the mixed gas is known. In this way, after an apparent specific gravity of the coal slurry passing through a flow meter has been derived by a calculation, a capacity value of the coal slurry by the flow meter is expressed in terms of a weight value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weighing method for transferring coal slurry.

In recent years, coal slurry obtained by mixing fine coal powder, heavy oil (or water), and additives such as surfactants has been developed as a fuel to replace petroleum.

This coal slurry is stored or transported as is,
Although it has the advantage of being handled in the same way as liquid fuel, coal slurry has problems such as small amounts of air being mixed in, and differences in specific gravity values depending on the type of coal used as a raw material.

These facts have been confirmed through laboratory testing of coal slurry or root-scale pilot plant testing.

Table 1 More than one example of property analysis Table 1 is an example of property analysis of coal slurry.Among these, the amount of air mixed in varies depending on the history of the coal slurry, and also changes to some extent depending on the coal concentration. do. For this reason, when managing the transfer of coal slurry, it is preferable to adopt weight standards rather than volume standards.

The present invention addresses the above-mentioned problems by collecting coal slurry from a coal slurry transfer pipe and measuring its sampling volume (v2), coal slurry volume (Vl), and coal slurry weight (Wl). , apparent specific gravity of coal slurry (SG
) and then converts the volume value into a weight value. The purpose of this invention is to provide a calibration method using a weighing sampler.

Next, the calibration method using the coal slurry measuring sampler of the present invention will be explained with reference to an embodiment shown in FIG. 1. (1) is a coal slurry transfer pipe;
The flow rate is controlled by a pipe, and it becomes the main flow path for coal slurry. In addition, (3) is a branch sampling pipe for the metering sampler, which receives the sample coal slurry by opening and closing the valve (4) according to the signal from the volumetric flowmeter (2), or by opening and closing it arbitrarily. Vessel (6)
It can be collected to. Note that the weighing sampler of the present invention is the part (9) indicated by a broken line. The coal slurry collected into the sample receiver (6) via the valve (6α) is measured for weight-IN (W□) by a load cell (6h) or a balance, and by a liquid level gauge (6c) (e.g. capacitance type liquid level gauge)
The capacity of the coal slurry (■□) is measured. Water in the tank (7) with a capacity corresponding to the total amount of the above-mentioned collected coal slurry and mixed gas is poured into the line (7b).
The weight of water (T2) is transferred to the measuring tank (8) through
is measured by a load cell (8α) or a balance, the total sampling amount (v2) including mixed gas is found, and the amount of air released at the time of sampling (V, Z) is Vα - v2 - ■1
It is obtained by calculating.

The calibration method using the coal slurry measuring sampler of the present invention is to sample the coal slurry from the coal slurry transfer pipe (1) as described above, and calculate the sampling volume (v2), the coal slurry volume (Vl), and the coal slurry weight (W1). ) by measuring
After calculating the apparent specific gravity (SC,) of the coal slurry passing through the flowmeter, the volume value of the coal slurry measured by the flowmeter is converted into a weight value, making it possible to accurately grasp the amount of coal slurry transferred. be.

In addition, if the above calculation example is explained based on FIG.
FR in the figure is the indicated value of the flowmeter (1/7 I!i n or m
3/hr), PO is the pressure at the time of flow measurement (kg/cIL
2G), G is the gauge pressure, To is the temperature at the time of flow measurement ("C
), Wl is the coal slurry weight (g or 9), vl is the coal slurry capacity ((cIrL3 or l) rail meter CL
), Pl is the pressure at the sample receiver (6) (kP/cm 2Gr ), T1 is the pressure at the sample receiver (6)
The temperature at [(calculated as To, , , T1 in the example), v2 is the total sampling amount ((coal slurry + air) water displacement amount (
Calculated from T2)), P2 is the pressure in the water tank (7) (kit/cm 2 G), T2 is the temperature in the water tank (7) ("C), and T2 is the temperature of the water in the measuring tank (8). weight(
g or Yu), therefore, weight conversion is obtained from FRxSG K.

Further, the above calculation example is illustrated by a concrete example as follows.

(Calculation example) Value indicated by volumetric flow rate box 2) of coal slurry: 501/
min pressure (Po): 3kg/cnL2G, temperature (
To): 70'C weighing sampler data Coal slurry weight (Wl): 8000g Coal slurry Coal slurry weight near 000ci3 (T170℃
(P, = 0 - wG) Total amount of coal slurry collected (T2) Near 050c*3 [Temperature (
T2) = 40℃] (corrected as absolute pressure) Therefore, 501 / min x 1.114-55-7
A weight conversion value of kg/min is obtained. For reference, the specific gravity value of coal slurry without correcting the amount of mixed air is a difference of about 2.5% when comparing the accurate value using this data on the amount of mixed air and the value when not using the data. This value depends on the amount of air mixed in, that is, the history of the coal slurry, and this is an example of the effectiveness of the calibration method using the weighing sampler of the present invention.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the calibration method using a coal slurry measuring sampler according to the present invention, and FIG. 2 is an explanatory diagram of symbols used in calculation. (1) Coal slurry transfer piping. Sub-agents: 2 patent attorneys and non-Kaihon important cultural documents Iri1

Claims (1)

[Claims] Coal slurry is collected from the coal slurry transfer pipe, and its sampling volume (V_2), coal slurry volume (V_1),
A method for weighing coal slurry using a weighing sampler, characterized in that the coal slurry weight (W_1) is measured, the apparent specific gravity (SG) of the coal slurry is determined, and then the volume value is converted into a weight value.