The method of controlling the contact apparatus sulfate production

 

(57) Abstract:

The invention relates to a method of managing heterogeneous catalytic chemical reactions and can be used in the manufacture of sulfuric acid obtained by the oxidation of sulfur dioxide. In the method of controlling the apparatus sulfate production stabilize the temperature of the inlet gas in the first layer of the catalyst control by bypassing cold gas by external heat exchanger, adjust setting this controller the main controller according to the temperature measured by thermocouple installed at a height of 1/3-1/4 of the entrance to the layer, clarify the task of the regulator on the outlet gas temperature of the layer, optionally measure the speed of the reaction of oxidation of SO2in SO3at the entrance to the first layer of catalyst on the value of the dynamic effect of the catalytic reaction. The method allows to increase the sensitivity and performance management system contact apparatus fluctuations in the concentration of sulphur dioxide and breach temperature regime with the aim of increasing product yield catalytic reaction and reduce environmental pollution. 1 Il.

The invention relative to the manufacture of sulfuric acid, obtained by oxidation of sulfur dioxide.

Known way to control the contact apparatus in the manufacture of sulphuric acid, which measure the flow rate and the temperature of the processed gas and the concentration of sulfur dioxide in it. Control actions of the form depending on the values of these parameters [RF Patent N 1265139, class C 01 B 17/6, 23.10.86)

The disadvantage of this method is the inertia and significant error management system that leads to decreased performance and yield of sulphur dioxide in the environment.

Closest to the invention to the technical essence is a way of managing the contact device by which to ensure the stable operation of the apparatus stabilize the temperature of the inlet gas in the first layer of the catalyst control by bypassing cold gas by external heat exchanger. Setting this knob adjusts the main controller according to the temperature measured by thermocouple, which is installed at a height of 1/3 - 1/4 of the entrance to the layer and specified by the regulator on the gas temperature at the outlet of the layer [A. G. Amelin. Technology sulfuric acid. -M.: Chemistry, 1983, S. 299-303].

The disadvantage of this method aulette that in certain periods the mode of operation of the contact device may not be optimal, that means lowering the degree of contact and increase the emission of sulfur dioxide into the atmosphere with harmful environmental consequences.

The objective of the invention is to increase the sensitivity and performance management system contact apparatus fluctuations in the concentration of sulphur dioxide and violation of the temperature regime, with the aim of increasing product yield catalytic reaction and reduce environmental pollution.

This object is achieved in that in the known method of controlling the apparatus, sulfuric acid production, which stabilize the temperature of the inlet gas in the first layer of the catalyst control by bypassing cold gas by external heat exchanger, adjust setting this controller the main controller according to the temperature measured by thermocouple installed at a height of 1/3 - 1/4 of the entrance to the layer, clarify the task of the regulator on the outlet gas temperature of the layer, optionally measure the speed of the reaction of oxidation of SO2in SO3at the entrance to the first layer of catalyst on the value of the dynamic effect of catalytic reactions.

The essence of izopet the apparatus according to the proposed method.

The block diagram contains the contact device 1, catalyst 2, thermocouple 3, 4, 5, temperature controllers 6, 7, 8, the sensor dynamic effect of reaction (DER) 9, the Converter 10, the valve 11.

The method is as follows. Control the gas temperature at the inlet into the first layer of catalyst thermocouple 3, at a height of 1/3-1/4 of the entrance to the first layer by thermocouple 4, and the output layer of thermocouple 5. When changing the concentration of SO2at the entrance to the apparatus of the first changes the temperature of the gas at the outlet of the layer. Causing the controller 8 adjusts the setting of the controller 7, which will change the task to the controller 6. The latter generates a signal to the valve 11 to change the gas temperature at the inlet of the device. Such temperature control is as long as the degree of transformation of matter, and therefore the reaction rate of oxidation of SO2does not reach the calculated optimum values for the first catalyst layer, which is registered by sensor DER 9. From this point, control the speed of the chemical reaction of oxidation on the contour, consisting of a sensor DER 9, the Converter 10, the inverter 6 and the valve 11, while providing instantaneous control for the slightest variations of concentration is t change the rate of oxidation of sulfur dioxide. The Converter 10 operates in the controller 6, which, in turn, generates a control signal to control valve 11 and to change the gas temperature at the inlet of the reactor. The signal of the sensor 9 is proportional to the speed of the oxidation reaction in accordance with the expression (see the "Surface" of 1993. N 11. c. 122):

f0= Pr- P = GJ, (1)

where J is the rate of a chemical catalytic reaction;

f0- the dynamic effect of the catalytic reaction;

Pris the gas pressure on the surface of the catalyst;

P is the gas pressure on the walls of the reactor;

G - factor, dependent on the pulse of molecules of reactant and reaction products.

Estimated value of the dynamic effect of the oxidation reaction SO2arising from the manufacture of sulfuric acid by the contact method, when the temperature of the gas mixture at the inlet into the first layer of the contact mass: T = 400oC, the pressure of the gas mixture: P = 105PA and content of SO2: 7%.

Substituting the above data in expressions (1) and considering that the oxidation reaction proceeds in accordance with the equation: 2SO2+ O2= 2SO33, we obtain the following value of the dynamic effect: f0= -0,824 102PA.

= 1,2 PA. This deviation is recorded by different sensors of the force.

Thus, the proposed method can improve the sensitivity and performance management system contact apparatus fluctuations in the concentration of sulphur dioxide and violation of the temperature regime, with the aim of increasing product yield catalytic reaction and reduce environmental pollution.

The method of controlling the apparatus, sulfuric acid production, which stabilize the temperature of the inlet gas in the first layer of the catalyst control by bypassing cold gas by external heat exchanger, adjust setting this controller the main controller according to the temperature measured by thermocouple installed at a height of 1/3 - 1/4 of the entrance to the layer, clarify the task of the regulator on the outlet gas temperature of the layer, characterized in that it further measure the speed of the reaction of oxidation of SO2in SO3at the entrance to the first layer of catalyst on the value of the dynamic effect of the catalytic reaction.

 

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FIELD: chemistry.

SUBSTANCE: invention refers to methods of producing sulphur trioxide and tetrabromphthalic anhydride. Sulphur trioxide is produced by method involving that the first gas flow containing SO2, SO3 and oxygen and/or air, is supplied to vanadium-containing catalyst layer wherein SO2 is oxidised in SO3, and the second gas flow containing sulphur trioxide is isolated. This method is improved with supplying evaporated sulphur to the first gas flow, so produced mixture is supplied through considerable part of catalyst layer then exposed at one or more temperatures within approximately 450 to 700C. Sulphur is oxidised to SO2. Consequently the second gas flow isolated from lower tail end of catalyst layer is enriched with sulphur trioxide to be used for producing compounds, such as tetrabromphthalic anhydride.

EFFECT: inventions allow for higher process efficiency.

34 cl, 5 dwg, 2 tbl, 7 ex

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