SU1528723A1 - Method of controlling the process of reduction of gaseous sulfur dioxide of metallurgical production - Google Patents

Abstract

The invention relates to a process for the production of elemental sulfur from sulfur dioxide waste gases and can be used in the non-ferrous metallurgy, chemical and petrochemical industries in the process of reducing sulfur dioxide with hydrocarbon gas. The aim of the invention is to reduce the specific consumption of the reducing gas. The method involves adjusting the ratio of costs to the smelting unit of the reducing gas and the total oxygen consumption in the blast by changing the supply of the reducing gas with a correction in relation to the sum of the concentrations of hydrogen sulfide and carbon dioxide to the concentration of sulfur dioxide in the reduced gas at the outlet of the melting unit. 2 tab., 1 Il.

Description

The invention relates to a process for the production of elemental sulfur from waste sulfur gases and can be used in the non-ferrous metallurgy, chemical and petrochemical industries in the process of reducing sulfur dioxide with hydrogen-hydrogen gas.

The purpose of the invention is to reduce the specific consumption of the reducing gas.

The drawing shows the implementation of the proposed method.

The scheme includes a melting unit 1 for melting metallurgical furnace, to which oxygen is supplied through the duct 2 and air through the duct 3, flow meters 4 and 5 on the oxygen and air supply lines, respectively, flow meter 6 on the reducing gas supply line, oxygen analyzer 7 , an actuator 8 for changing the supply of reducing gas to the unit aptec 1, a regulator 9 for reducing gas flow rate and a gas analyzer 10 for determining.

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00

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the content in the recovered gas is hydrogen sulphide, urode sulfur dioxide, and sulfurous anhydride.

The method is carried out as follows.

When the oxygen consumption in the blast varies, which is determined by the volume of the metallurgical feedstock processed and its sulfur content, the amount of sulfuric anhydride formed accordingly changes, which makes it necessary to control the flow of reducing gas. In this case, the current amounts of technical oxygen, air and reducing gas, respectively, are measured by flowmeters 4.5 and 6, and the oxygen content in technical oxygen is also measured by analyzer 7, the amount of oxygen in the blast is determined:

(V

tchin

VQ ,, V3o, A, o 0.21)

3, the regulating gas flow rate regulator 9 generates a signal of the difference between the desired and the current values of the ratio of reducing gas to oxygen in the blast. Then, with a negative sign, the difference is reduced, and with a positive sign, the consumption of the reducing gas is increased, while maintaining the ratio of reducing gas to oxygen in the blast with the help of the actuator 8 equal to 0.3-0.4.

In addition, the exact value of the target ratio of the reducing gas to oxygen in the blast is determined by the results of the gas analyzer (chromatograph) 10 by the value of the ratio of the sum of hydrogen sulfide and carbon monoxide to sulfur dioxide, which should be equal to 2.

Because of the air leaks that occur when working

unit, the ratio varies

HiS + COS

- -PP- By reading gazoanalioOq,

The mash 10 is periodically corrected to a given ratio of reducing gas to oxygen in the blast.

The proposed method was tested under experimental-industrial conditions and the data obtained are presented in Table. 1 and 2.

The analysis of the data shows that in the proposed control method

50

five

5 o

Q

with

By maintaining the ratio of reducing gas (CH) to the oxygen content in the blast smelting 0.3-0.4, the required ratio between the reduction product (hydrogen sulfide and carbon sulfoxide) to sulfur dioxide is close to 2 (1 , 72-2.2), providing the highest yield of elemental sulfur at the catalytic stage.

Compared to limestone, the proposed method increases the greater degree of sulfur recovery by 5-10%. Due to maintaining a more accurate ratio between the reduction products using the proposed adjustment of natural gas consumption with a lower consumption of reducing agent for the exact sulfur produced (650 vs. 750 nm).

When the ratio of the reducing gas (CH) to oxygen in the blast (O) is less than 0.3, the ratio between the sum of hydrogen sulfide 4, carbon dioxide and carbon dioxide to sulfur dioxide is much less than 2 (1.02-1.28), which reduces i-;

  CH

sulfur craving. With respect to -

g more than 0.4 in recovery products

the content of hydrogen sulfide and the ratio of the sum + COS to SOj increase. however, significantly more than 2 (2.89-2.7), which also leads to low sulfur recovery.

Example: Controlled the process of obtaining elemental sulfur, while controlling the flow rate of natural gas by changing the amount of oxygen in the blast of the flue gas. The amount of natural gas was 7430 m / h, the amount of oxygen in the blast was 17280. Current ratio ---: 0.43. The specified ratio is 0.33. The amount of oxygen () f

p dut1) a 17400 m / h. The required amount of reducing gas 5740 MV4.

five

The amount of natural gas was reduced by 1,690 m / h, in order to maintain

SCL given ratio ---, jj,

2

PRI mme R 2. The control was conducted under the conditions of Example 1. The amount of natural gas is 4540 m / h, the amount of oxygen in blast is 16210 m / h, the current

an attitude

0.28, specified ratio of oxygen

CH4

CH pchia --- 0, j3,

1 in the blast 17400 m / h.

To maintain a given ratio, neither --- 0.33 is necessary for natural

gas 5740 m / h.

Increase the amount of natural gas by 1200 m / h.

Technical and economic advantages of the invention compared with the prototype consist in increasing the yield of elemental sulfur by 10.5%, simplifying the process control scheme by reducing the number of analyzes of the source gas (1 time per shift against 1 time per 1 h of the prototype) and eliminating measurements its consumption at 1350 s; increase control accuracy; reducing the consumption of reducing gas by 10-15%.

Claims (1)

Formula invented and The process control method for the recovery of sulphurous gases from metallurgy - but 5287236 production, including the regulation of the supply of the reducing gas, oxygen and air flows into the melting unit, and with the fact that, in order to reduce the specific consumption of the reducing gas, the concentrations of hydrogen sulphide, sulfur dioxide are additionally measured Q carbon and sulfur dioxide in the reduced gas at the outlet of the melting unit, based on the values of which determine the ratio of the sum of the concentrations of hydrogen sulfide and sulfur dioxide 15 carbon to the concentration of sulfurous anhydride, and the concentration of α-oxygen in the oxygen stream, the flow rate of oxygen supplied to the smelting unit, the current value of the reduction ratio gas and total oxygen consumption and regulate it with a correction in relation to the sum of the concentrations of hydrogen sulfide and carbon dioxide to the concentration of sulfur dioxide. I - t a b l and c a 1 1 time per hour - 0.5-0.7 1 time per shift Continuously, 0.55-0.6 automatically SOj concentration. in the starting process gas, it is 12-40%. T a i C a 2 750 --650 Editor N. Kishtulints Compiled by G. Ogadzhanov Tehred M. Didyk Proofreader N. King Order 7607/19 Circulation 435 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 -----------. Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription