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Installation includes a throttle assembly built in the blast-furnace outlet pipe and at least two gas turbines with blast furnace gas heaters also built in the outlet pipe and being parallel with the throttle assembly. Each of the gas turbines having a control diaphragm and a stop diaphragm is provi

Installation includes a throttle assembly built in the blast-furnace outlet pipe and at least two gas turbines with blast furnace gas heaters also built in the outlet pipe and being parallel with the throttle assembly. Each of the gas turbines having a control diaphragm and a stop diaphragm is provided with a separate drive for turning thereof. The installation is also furnished with an isodromic regulator, for the gas pressure under the shaft top of the blast furnace, electrically connected to the separate drives of the throttles, being a part of a throttle unit and by means of a logic control unit being connected to separate drives of the control diaphragms of the gas turbines. The regulator preselects a sequence of operation of the above drives, when in the process of gas pressure control under the shaft top in the super-capacity blast furnace, to open in the first-turn the control diaphragms of the gas turbines and then to open the throttles which are a part of the throttle assembly. But when closing, the throttles are operated in the first turn and after that the control diaphragms are closed. Connected according to an electric circuit, contacts of switches are switched on by the logic control unit. The control diaphragms of the gas turbines are furnished with switches which operate when the control diaphragm turning at a position of closing up to the position corresponds to a given gas flow rate.

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An installation for controlling the gas pressure under the shaft top of a super-capacity blast furnace comprising: a throttle assembly built in an outlet gas pipe of said blast furnace having at least two control throttles arranged in parallel with respect to the gas flow and having separate drives

An installation for controlling the gas pressure under the shaft top of a super-capacity blast furnace comprising: a throttle assembly built in an outlet gas pipe of said blast furnace having at least two control throttles arranged in parallel with respect to the gas flow and having separate drives for turning said control throttles; at least two utility gas turbines connected to said outlet gas pipe of said blast furnace in parallel to each other and to said throttle assembly, each of said gas turbines having a control diaphragm and a stop diaphragm with separate drives for turning said diaphragms; a blast furnace gas heater mounted before each of said gas turbines for preheating the blast furnace gas fed to said gas turbines to a predetermined value; first switches mounted on said drives for turning each control throttle of said throttle assembly and being actuatable upon closure of said control throttles; second switches mounted on said drives for turning said control diaphragms of said gas turbines and being actuatable upon closure of said control diaphragms to a predetermined extent corresponding to a minimum flow rate of blast furnace gas through said gas turbine at which the gas preheating in said preheater is not cut off automatically; third switches mounted on said drives for turning each control throttle, with the exception of a first control throttle, and each control diaphragm of said gas turbines operating when said control throttles and control diaphragms are completely open; a pressure regulator having a sensor for measuring the pressure of said blast furnace gas under the shaft top and having a setter, said regulator being electrically connected to all said drives for turning said control throttles and control diaphragms, said regulator generating a signal to said drives to open said control throttles and control diaphragms when said blast furnace gas pressure under the shaft top exceeds a predetermined value, said regulator generating a signal to said drives to close said control throttles and control diaphragms when the pressure under the shaft top drops down below a specified limit; and an electrical control device which includes all contacts of said first, second and third switches and which transmits said signals from said pressure regulator to said separate drives for moving said control throttles and control diaphragms in a specified order, said pressure regulator acting on only one separate drive at any instant of time.