SU1640105A1 - Method of producing granulated sulphur - Google Patents

Abstract

This invention relates to methods for granulating sulfur and can be used in plants processing sulfur ores and receiving sulfur as a commercial product. The aim of the invention is to simplify the process and reduce sulfur emissions to the environment. The essence of the method is that the cooling and granulation of sulfur is carried out by contacting liquid sulfur with wet saturated steam circulating in a closed loop. Dry granulated steam is obtained at the exit of the granulator, from which wet saturated vapor is produced in a recuperative heat exchanger. The humidity of the saturated steam supplied to the cooling and granulation of sulfur is calculated using the above formula. 1 il.

Description

The invention relates to the sulfur industry and can be used in enterprises processing sulfur ores and receiving sulfur as a commercial product.

The aim of the invention is to simplify the process and reduce sulfur emissions to the surrounding atmosphere.

The drawing shows an installation that implements the method

The installation consists of a tank 1 for liquid sulfur, a pump 2, a granulation device 3, a granulation tower 4, a louver grille 5, a separator 6, a fan 7, a recuperative heat exchanger 8, and a steam line 9.

Liquid sulfur with a temperature of 123- from tank 1 is fed by a sulfur pump-2 to granulation device 3, located in the upper part of granulation tower 4, where sulfur is dispersed and its drops are cooled by upward flow of moist saturated steam and freeze "At the same time, all moisture contained in the steam is completely evaporated, i.e. dry saturated steam is obtained, which is discharged through the louvered grill 5 from the upper part of the tower 4 to the separator 6, in which sulfur dust is carried away with the steam separately. with help in The fan 7 is fed to a recuperative heat exchanger 8, in which the heat produced by the steam in the tower is removed from the liquid sulfur. In this case, the steam becomes wet saturated. The heat removal from steam and its final humidity is controlled by the flow rate of cooling water supplied to the recuperative heat exchanger 7. Moist saturated steam is supplied via a steam line 9 to the lower part of the granulation tower 4 and used for cooling the liquid sulfur.

05 4

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PRI me R. Sulfur with a temperature of 125 ° C is fed to a unit for the granulation of liquid sulfur with a capacity of 1 million million tons per year. In granulation towers, sulfur is granulated and cooled to 100 ° C with moist saturated steam. For this, granulation towers supply gas with moisture W determined by the formula:

W

Gc

(t. tc.) r with

de G - hourly performance

installations (120 t / h); Ss - weight heat capacity of sulfur

(1 kJ / kg hail); r0 is the heat of fusion of sulfur

(40 kJ-kg); g. - heat of vaporization

water (22,626 kJ / kg); K - 1.05 - coefficient taking into account heat loss to the environment;

Gn - hourly steam consumption for sulfur cooling (21 t / h); t temperature of liquid sulfur

(125 ° C); tc - sulfur temperature after

cooling (100 ° C); Thus, W is 0.156. The installation consists of three granulation towers with a sulfur productivity of 40 t / h each. Steam consumption per tower 7 t / h or 11,700 (steam density at 100 ° C is 1,673 kg / m 2) Steam supply to each tower is made by fans with a capacity of 11,700 m / h and a pressure of 1,475 Pa each.

To obtain wet saturated steam with moisture content W 0.156 from dry saturated steam, the latter is cooled in recuperative heat exchangers with water, the amount of heat taken from dry saturated steam equal to the amount of heat taken from sulfur in the granulation towers. This provides a set value of humidity at the entrance to the granulation towers. The cooling water is heated in heat exchangers from

t6 (20 to tBt 90 ° C, then the water flow is determined by the formula

- - .jl,

at

C (t

.

- t

e,

)

where CB 4.19 kJ / kg, hail - weight

water heat capacity Thus G6 27 t / h.

The proposed method, in comparison with the known, allows to simplify the process by eliminating the stage of preparation of the carrier gas with droplets of volatile matter suspended in it.

material, and also reduce sulfur emissions to the surrounding atmosphere by circulating a cooling agent in a closed loop.

Claims (1)

Invention Formula The method of obtaining granulated sulfur, which involves supplying liquid sulfur to the granulator, cooling it and granulating upon contact with a cooling agent. agent different the fact that, in order to simplify the process and reduce sulfur emissions to the environment, the circulating closed circuit saturated water vapor with humidity determined by the formula five 0 W Gc Gn С с .Јt с - tcAl + Г с  where GC is the amount of granulated sulfur; Gn - steam consumption for granulation sulfur; Cc is the weight heat capacity of sulfur; t is the temperature of liquid sulfur; 10 - granulated temperature sulfur; gc is the heat of fusion of sulfur; r p is the heat of evaporation of water; K is a factor for taking heat losses into the environment, and the steam leaving the granulator is cooled to a moisture content corresponding to the humidity of the saturated steam supplied to the granulation stage. tf LJ V / F zht 7