SU916545A1 - Apparatus for controlling gas pressure on blast furnace grate - Google Patents

Description

The invention relates to gas ⁴ , the blast furnaces of ferrous metallurgy plants and can find an example _; neniya at regulation of tap of gases in other productions.

A device for controlling gas pressure at the top of a blast furnace is known, which includes a throttle group, which represents a complex of rotary chokes grouped in one unit.

The purpose of the throttle group is to create an increased gas pressure under the top of the blast furnace, which is achieved by reducing the flow area of the throttle group by closing part of the throttles.

In the throttle group of known construction, five branch pipes of various diameters are mounted in parallel. Three of them of larger diameter (700–1000 mm) are formed by electrified chokes. One of smaller diameter (300500 mm) is equipped with a throttle with auto2

matically controlled drive, gaining momentum from the gas pressure under the blast furnace throat. The fifth nozzle (usually with a diameter of 300 mm), may not have a choke, is located at the bottom and is designed to pass water. The throttle group is equipped with a spray irrigation system [1]

A disadvantage of the known device is that its design does not allow to provide density in the closed position, which is typical for rotary chokes. In this regard, when the pressure of the blast-furnace gas is activated at the gas utilization bes * ⁵ compressor turbine (GUBT) and the throttle group is installed on the GUBT bypass, the passage of gas through the throttle group is up to 50%, which significantly reduces the efficiency of GUBT use.

Closest to the proposed technical essence and the achieved result is a device for

916545

gas pressure at the top of the blast furnace, which includes gas supply and exhaust chambers, valves with saddles, shut-off cone, stem, actuators of displacement of locking cones, irrigation system [21.

The disadvantage of this device is the need to overcome large efforts from the pressure of the gas acting on the surface of the locking cone. ten

The purpose of the invention is to improve the reliability of the operation.

This goal is achieved by the fact that in a device for controlling gas pressure at the top of a blast furnace, 15 which includes a gas supply and gas outlet chambers, valves with saddles, stop cones, a stem, movement drives of stop cones, the irrigation system _{} a} gas supply chamber with a coaxial bottom is installed inside the gas discharge chamber, each pair of valve seats fixed to a diameter— [directly in the walls of the gas supplying chamber with a flexible element in one seat, and 25 in each pair of stop cones one is located outside it ,. and the other on the inside of the gas supplying chamber, and they are equipped with irrigation actuators. thirty

The gas supply and gas discharge chambers are connected to the valve by-pass pipe; a slag removal system is installed in the conical bottom of the gas-conducting chamber. ₃₅

FIG. 1 is a schematic diagram of the device; in fig. 2 is a section A-A in FIG. 1; in fig. 3 — node 1 in FIG. one.

The device consists of a gas supplying chamber 1 having a cylindrical ₄₀ conical shape and installed inside the gas discharge chamber 2. In the wall of the gas supplying chamber 1 valve sockets 3 are installed in pairs. In the sockets of a pair of valves 3, locking cones 4 are installed, located one with the outside and the other from the inside of the gas supplying chamber 1.

The locking cones 4 are installed in pairs of valves fixed on one 5P rod 5, equipped with the main drive 6 of the translational movement and the additional drive 7 of the rotational movement. In addition, chambers 1 and 2 communicate with each other by-pass through a 55 gas flue 8 equipped with a rotary valve 9. The gas supply chamber is equipped with an irrigation system 1O. In the lower part, the gaon-conducting chamber has a system 11 for removing sludge under pressure. One of the valves located in pairs is equipped with a flexible element 12, providing hermetic closing of the valves.

The device works as follows.

The gas from the gas supplying chamber 1, which has a cylindrical-conical shape, enters the gas supplying chamber 2 | through the valve sockets 3 arranged in pairs in the wall of the gas-supplying camera 1. By pressing the locking cones 4 to the valve sockets 3 by moving the rod 5 by actuators 6 and 7 alternately closed pairs of valves. Since the gas pressure acts on the pairwise mounted cones 4 in opposite directions, the forces on the drives 6 are not transmitted from the gas pressure, but are perceived by the rods 5 themselves as internal forces.

Possible errors in the manufacture of the structure are compensated for by closing the valves located in pairs by the fact that one of them is equipped with a flexible element 12, which, deforming, perceives the possible difference between the linear dimensions, ensuring reliable closure of both valves with cones 4.

To ensure that the cones 4 fit snugly to the valve sockets 3 under conditions of their overgrowth (sediments), as well as to prevent the cones from sticking when they are closed for a long time, along with the forward movement, they carry out rotational motion by the actuators 7, which can be combined with the actuator 6

The irrigation system 1O provides water to the device. After closing the valves and raising the gas pressure under the blast furnace throat to the nominal value, the rotary valve 9 on the bypass duct 8 is put into operation. It is also possible to use the device with automatic maintenance of the gas pressure above the furnace one of the pair-arranged valves without valve 9. Sludge removal from the device under pressure is carried out on the system 11.

The advantages of the proposed device is to increase the reliability of its work by increasing the density

916545

five

designs with relatively small

efforts to close and open valves.

Claims (2)

Claim 1. A device for regulating gas pressure at the top of a blast furnace, including a gas supply and gas outlet chambers, valves with saddles, stop cones, a stem, actuators for moving the stop cones, an irrigation system, characterized in that, in order to improve operational reliability, the gas supply the chamber 15 is installed inside the gas exhaust chamber, each pair of seats mounted diametrically in the walls of the gas a supply chamber with a flexible element in one saddle, and in each pair of stop cones one is located on the outside, the other on the inside of the paddle 5 of the chamber, and they are equipped with rotational drives. • 2. Device by π. 1, which is connected with the fact that the gas supplying and gas exhausting chambers are connected by a bypass gas pipeline, and a sludge removal system is installed in the bottom of the gas supplying chamber.