SU1555468A1 - Method of conveying molten sulfur - Google Patents

Abstract

The invention relates to the mining industry and can be used in enterprises that extract sulfur by the method of underground smelting. The goal is to reduce heat and energy costs. Molten sulfur (PC) is fed into the pipeline (TP) at 135 - 140 ° C. In the process of moving the RS through the TP, the TP is continuously heated on its separate sections by means of steam jackets. In the remaining sections of the TP, the temperature of the PC is measured and they are periodically heated when the temperature drops to 120 - 122 ° C. The length of the TP portions with constant and periodic heating (L ^{_{p. O.}} And L ^{_{d. O.)}} Were determined, respectively of the expressions L _bp = G ^_p. C _with (T _with - T _with ) / G _t (I _t -I _k ) -Q and L _d ^{. _about.} = G _with ^. C _to (T _c - T _a) ^Q. K, where G _with - the flow of the transported RS, t / h

C _с - weight specific heat of RS, kJ / kg / deg

T _с , T _с - RS temperatures at the inlet and outlet, respectively, of constantly and periodically heated sections of TP, ° С

G _t - hourly consumption of heat carrier for heating of 1 rm. TP

t / h

I _t , I _c - enthalpy coolant, respectively, at the inlet and outlet of the heated sections of the TP, kJ / kg

Q - heat loss to the environment from the surface of 1 pm TP, kJ / rm. h

K is the coefficient of accounting for the irregularity of heat losses from the TP surface. 1 il.

Description

The invention relates to the mining industry and can be used in enterprises that extract sulfur by the method of underground smelting,

The purpose of the invention is to reduce heat and energy consumption,

The drawing shows a diagram of the molten sulfur transportation line.

Liquid (molten) sulfur with a temperature of 135-140 ° C is fed from the metering tank through the valve 2 through the pipeline 3 using sulfur

pump 4 to the warehouse of sulfur. In order to maintain the transported sulfur in the liquid state during its transportation through pipeline 3, the latter is heated. The heating is performed with steam or hot water, which is fed into the shirts 5 of pipeline 3, or produced by electric heating with the help of heating elements 6. Heat energy supplied with a heating agent, is partially spent on compensation of heat losses from the surface of the pipeline 3 to the environment, and partly goes to heat the transported liquid sulfur. To reduce the heat energy consumption for associated gas Pipeline heating uses the physical heat of liquid sulfur, for which heating of pipeline 3 is carried out only in certain sections (main heating) alternating with sections of pipeline 3, where a short-term periodical heating is turned on (additional heating). Additional periodical heating of individual sections of the pipeline 3 is automatically activated when the temperature of the transported sulfur drops to 120 - 122 C. To do this, temperature sensors 7 are installed at the outlet of the additional heated sections, the pulse from which is fed to the amplifier 8 and further to the multi-point controller 9. The latter automatically switches on the additional heating of individual sections of the pipeline 3 as the temperature drops to 120-122 ° C and turns it off when the sulfur temperature rises to 123-125 ° C. Additional heating of individual sections of the pipeline is effected, for example, by electrical heating, for which these sections are equipped with

electric heating.

Liquid,

tapes

sulfur with a temperature of 120-122 ° C during periods when additional heating is not included, and with a temperature of 123-125 ° C during periods when additional periodic heating is switched on, it is supplied to permanently heated sections of pipeline 3 equipped with jackets 5, in which serves, for example, water vapor. The latter is taken from the main steam line 10 and is supplied via steam lines 11 through gate valves 12 to shirts 5 of pipeline 3. Steam condensate coming out of shirts 5 is fed through pipelines 13 through valves 14 to a condensate collector and is used for the technical needs of the mine.

The length of each continuously or periodically heated pipeline during the movement of liquid sulfur is calculated by the formulas:

GC Cj: Vtjc - tЈ2

 (Y

Gc Cc (t with - fcj)

five

0

five

0

five

t -

w J s

where „,„ and 1 л.о are the lengths of constantly and periodically heated sections of pipeline 1, respectively;

Gc - flow rate of transported liquid sulfur, t / h;

Сс - weight heat capacity of molten sulfur, kJ / / kg - hail; liquid sulfur temperatures at the inlet and outlet of the constantly and periodically heated pipeline sections, ° C; hourly flow rate of the heat carrier for heating 1 p, m of the pipeline, t / h; the enthalpy of the coolant, respectively, at the inlet and outlet of the heated sections of the pipeline, kJ / kg; q - heat loss to the environment from the surface of 1 pm of pipeline, kJ / p.

K - coefficient of accounting for the uneven heat losses from the surface of the pipeline

water, K 3,

i

Claims (2)

1. A method of transporting molten sulfur, which includes a constant heating of the pipeline during the movement of molten sulfur through it, characterized in that, in order to reduce the heat power consumption, a constant heating of the pipeline is carried out in its individual sections, and in other sections of the pipeline the temperature is measured transported molten sulfur and they are periodically heated when the temperature of sulfur decreases to 120-122 ° C. 2. A method according to claim 1, characterized in that the constant and periodic heating of the pipeline is carried out in areas whose length is respectively determined from the expressions . Gc Ccvtc-tc) by  five G with (with)  q. TO ; 555468 where 1st is 15 20 25 thirty About 4-0 GC ss c. G. -i ik one TO lengths, respectively, of constantly and periodically heated sections, m; consumption of transported molten sulfur, t / h; weighted heat capacity of molten sulfur, kJ / kg hail; liquid sulfur temperatures at the inlet and outlet of the constantly and periodically heated pipeline sections, ° C; hourly flow rate of the heat carrier for heating of 1 pm of pipeline, t / h; the enthalpy of the coolant, respectively, at the inlet and outlet of the heated pipeline sections, kJ / kg; heat loss to the environment from the surface of 1 pm of pipeline, kJ / p.m-h; coefficient to account for the uneven heat loss from the surface of the pipeline. $