SU887459A1 - Method of automatic control of sulphur dioxide production process - Google Patents

Description

acts on the regulatory body (block) 6 of the air supply to the furnace. The regulating unit 7 receives data on the gas temperatures of the furnace furnace, raw materials and air supplied to the furnace and measured with thermocouples and the corresponding 8, 9 and 10.

The method of automatic winding the process of sickle gas is carried out as follows.

The sigpal from gas analyzer 1, measuring concept 1 of sickle gas on furnace outlet 2, enters the fuktsiopalny unit 3. If the conceptual pressure of the natural gas from the furnace 2 does not go beyond the allowable range, and the change in the signal given to the acceptance of serppt gas from the furnace per unit of time exceeds the specified range , the block 3 acts through the regulator 4, the switch 5 of the regulator 5 of the regulator 6, which changes the flow rate of the air that is supplied to the air. When the concentration of eruptive gas after the furnace 2 reaches the upper or lower limits of the allowable range or irn changes in the concentration of sulfur dioxide in the furnace kiln per unit of time less than a predetermined value, unit 3 acts on the regulating unit 7. In this case, unit 7 generates a control action depending on the temperature difference between the material flows after and before the furnace, measured by thermocouples 8, 9 and 10 and through the switch 5, acts on the regulator 6, which changes the flow rate of air that is fed into the furnace. When returning the concentration of sulfur dioxide to the furnace 2 within the specified range and changing the concentration of eoric gas after the furnace burns at a time higher than the specified value, unit 3 prohibits the block 7 from block 5, and the flow of air supplied to the oven 2 through blocks 4, 5 and 6, depending on the change in the co-titration of a series gas after the furnace, measured by the gas analyzer 1. In this case, the following functional dependencies are realized in the control unit blocks.

The fuction unit 3 checks the logical conditions on the input signal from sensor 1, which determine two possible ways of controlling the process of obtaining a gas.

The first option is determined by the condition:

(С „„. CD.) С, „„) А (. С, (А.) ДС „), (1)

where sshah. Cinin - specified tops and faints of the acceptable range of traders and sulfur dioxide after-treatment center 2;

LSO is the specified value of the change in the co-transfusion of sulfur dioxide after the furnace 2;

Cr (t) is the current value of the concentration of sulfur gas after the furnace 2;

DSG (Dt) -change of sulfur dioxide co-transference after the furnace 2.

At the same time, the conditions indicated above, the signal from sensor 1 through the functional block 3 feeds on controller 4 and switch 5. At the same time, fuction unit 3 forms a primer O, which goes to regulator block 7 and switch 5. In this case, the regulator

4 generates a control action, for example, by adjusting the PI-ditch. In this case, the regulating unit 7 forms an additional feature O and does not result in the formation of a control action according to the temperature gradient of the material flows after n before the furnace 2. When the switch 5 of the specified signal comes from the functional unit 3, the control effect of regulator 4 and prizpak About from the regulating unit 7, the switch 5 exerts an influence on the regulator 6.

The second variant of the control method for the production of sickle gas is determined by the condition:

(C, groin Cr (t)) V (C, n, n C, (-.} V ACg (Dt)

DSO. (2)

When this condition is fulfilled, the functional block 3 forms the sign 1, which nots on the regulating block 7 and the switch 5 on the other input. Regulator 4 in this case does not produce a control action. The control unit 7 generates a control action, for example, according to the PI law, it is governed by the temperature difference after and before the furnace. In this case, when the control unit 5 receives the control action from the regulating unit 7, the switchboard

5 operates on the regulatory authority 6.

The proposed method for automatic control of the process for the production of sulfur dioxide may increase the period of stabilization of sulfur dioxide after the furnace by an average of 0.5%.

Claims (2)

1. Author's certificate of the USSR 611876, cl. From 01B to 17/50, 1976. 2.Bernshtein I.M.N. Dr. Automation of the control of sulfuric acid production. M., Himi, 1975, p. 64. fffffffff / 77i, / y ZffJ