RU2771427C1 - Blast-furnace gas cleaning system - Google Patents

Abstract

FIELD: ferrous metallurgy.

SUBSTANCE: invention relates to the utilization of secondary energy resources in ferrous metallurgy, in particular in blast-furnace production, and is intended for use in gas cleaning systems, in particular in scrubbers for wet gas cleaning of blast-furnace gas. The gas cleaning system includes a housing, inlet and outlet gas pipes, a water supply system and a water removal system, at least two hydraulic seals equipped with control throttles connected by a rigid drive to a float chamber, and a hydraulic unit, including a hydraulic turbine and an asynchronous motor, while the hydraulic unit is installed in series with control throttle on one of the scrubber hydraulic seals.

EFFECT: invention makes it possible to obtain additional electric power by utilizing excess combined pressure of water and gas.

2 cl, 1 dwg

Description

The invention relates to the utilization of secondary energy resources in ferrous metallurgy, in particular in blast-furnace production, and is intended for use in gas cleaning systems, in particular in scrubbers for wet gas cleaning of blast-furnace gas.

Known systems for energy recovery of blast-furnace gas [USSR Author's certificate No. 1420023, C21B 5/06, publ. 08/30/1986].

Such systems include the main element of the GUBT (gas recovery uncompressed turbine) - the unit, which operates due to the pressure drop of blast-furnace gas, rotates the electric generator.

However, potential energy resources are available in subsequent blocks of the blast furnace production cycle, in particular, in gas cleaning systems.

Known methods of wet gas cleaning of blast furnace gas [patent No. 2324525, IPC C21B 5/06, publ. May 20, 2008].

Such methods are implemented in a wet jet scrubber device.

Water after irrigation of the gas flow coming from the blast furnace is discharged into the sludge tray of the gas cleaning system. In the lower conical (bunker) part of the scrubber, drain pipes (hydraulic seals) with control throttles are embedded. Each throttle is connected by means of a system of levers and rods with a specific remote float chamber. When the water level in the scrubber rises, the float mounted on the shaft rises. Conversely, when the water level drops, the float lowers, turning the shaft. The end of the shaft through the sealing bottom box is brought out of the float chamber and, with the help of a lever and an adjustable rod, turns the control throttle lever “to discharge water” or to “close”. Despite the excess gas pressure in the scrubber, water is not completely discharged from the scrubber and the gas cleaning process is sealed.

In this case, the pressure of the geodesic column of water in the scrubber and the excess pressure of the gas are not used.

Thus, in the prior art there is a possibility associated with the disposal of excess combined pressure of water and gas in the scrubber.

Known designs of small hydropower [USSR Author's certificate No. 1204774, IPC F03B 13/00, publ. 01/15/1986].

Such systems are installed on water level differences in natural conditions or man-made dams.

At the same time, documents describing the possibility of installing such units on gas cleaning systems, including blast-furnace gases, are not known in the prior art due to such restrictions as water purity, as well as the need to ensure the technological level of water in the scrubber.

The present invention proposes a technological scheme for utilizing the excess combined pressure of water and gas, consisting of a wet gas scrubber, including a housing, inlet and outlet gas pipes, a water supply system and a water removal system, at least two hydraulic seals equipped with control throttles connected by a hard drive to a float chamber, and a hydraulic unit, including a hydraulic turbine and an asynchronous motor, the hydraulic unit being installed in series with the control throttle on one of the scrubber hydraulic seals.

The technical result of the invention is to obtain additional electricity by utilizing the excess combined pressure of water and gas.

In addition, the system may include at least one bypass valve installed in parallel with the hydraulic unit. Such a design can additionally pass water in case of emergencies or when the turbine is taken out for repair.

The essence of the present invention is further illustrated by the following graphics:

Figure 1. Technological scheme for the disposal of excess combined pressure of water and gas, where:

1 - scrubber (gas cleaning apparatus based on gas flushing with liquid);

2 – gas inlet pipe (provides gas supply to the scrubber);

3 - float chamber (ensures the maintenance of a given water level);

4 - hard drive (a system of levers and rods that connects the control throttle with an external float chamber, which ensures the transfer of force to the mechanism);

5 - water seal (a curved pipe in which water is retained, preventing the penetration of gases from the scrubber into the environment);

6 - backup choke, bypass (backup water flow);

7 - pre-turbine gate (designed to supply or stop the supply of water to the hydraulic unit);

8 - hydraulic unit (a unit that combines a hydraulic turbine and an engine together with their auxiliary systems);

9 - water removal system;

10 - sludge tray of the gas cleaning system (ensuring the removal of polluted water from the circulating cycle for subsequent cleaning);

11 - frame of the hydraulic unit (fixes the hydraulic unit on the foundation and ensures the rigidity of the structure);

12 - foundation (building load-bearing structure that takes all the loads from overlying structures and distributes them over the base).

The implementation of the proposed system takes place in accordance with Fig. one.

Water after irrigation of the gas flow coming from the blast furnace is discharged through the gas inlet fitting (2) into the sludge tray of the gas cleaning system (10). In the lower conical (bunker) part of the scrubber (1), drain pipes (water seals) (5) with control throttles are embedded. Each throttle is connected by means of a system of levers and rods (4) with an external float chamber (3). When the water level in the scrubber (1) rises, the float attached to the shaft rises. Conversely, when the water level drops, the float lowers, turning the shaft. The end of the shaft through the sealing bottom box is brought out of the float chamber and with the help of a lever and an adjustable rod (4) turns the control throttle lever (6) “to discharge water” or to “close”. Despite the excess gas pressure in the scrubber, water is not completely discharged from the scrubber and the gas cleaning process is sealed.

Water from the scrubber (1) through the hydraulic seal (5) through the pre-turbine seal (7) enters the flow path of the hydraulic turbine (8), is supplied to the impeller, creates a torque on the turbine shaft and is then discharged through the outlet pipeline (9) to the slurry tray of the system gas cleaners (10).

The hydraulic turbine is fixed by a frame (11) on the foundation (12) and consists of a stator part, which includes a fore chamber, a shaft casing with stator columns, an impeller chamber, which, together with a suction pipe diffuser, form a flow path, and a rotor part, consisting of an impeller , shaft, bearing assembly and shaft seal (not shown).

The proposed system allows you to get 75 kW of electricity, which can be used, including for internal production needs.

Thus, the proposed system ensures the achievement of the technical result.

Claims (2)

1. A blast-furnace gas cleaning system, consisting of a wet gas scrubber, including a housing, inlet and outlet gas pipes, a water supply system and a water removal system, at least two hydraulic seals equipped with control throttles connected by a hard drive to a float chamber, and a hydraulic unit, including a hydraulic turbine and an asynchronous motor, and the hydraulic unit is installed in series with the control throttle on one of the scrubber hydraulic seals. 2. The system according to claim 1, characterized in that it contains at least one bypass valve installed in parallel with the hydraulic unit.

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