Blast furnace gas recovery system

Abstract

The blast furnace gas recovery system comprises a furnace top material tank and a blast furnace, and the furnace top material tank is connected to the furnace top of the blast furnace through a material pipe; a nitrogen pipeline is connected to the furnace top charging bucket, and a nitrogen pipeline valve is installed at the gas outlet end of the nitrogen pipeline. The nitrogen pipeline is connected with a nitrogen back-blowing pipeline, the inlet end of the nitrogen back-blowing pipeline is connected to the nitrogen pipeline, the outlet end of the nitrogen back-blowing pipeline is connected between the inlet end and the outlet end of the material pipe, and nitrogen back-blowing pipeline valves are mounted at the inlet end and the outlet end of the nitrogen back-blowing pipeline; the blast furnace gas recovery system is provided with the nitrogen back-blowing pipeline for back-blowing the material pipe, and the atomization dust remover is arranged on the nitrogen back-blowing pipeline, so that when a scaling layer attached to the inner wall of the material tank is back-blown through the nitrogen back-blowing pipeline, blown particles can be filtered and removed by the atomization dust remover; the material pipe is prevented from being blocked to a certain extent, so that the circulation of airflow is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting, in particular to a blast furnace gas recovery system. Background Art

[0002] Blast furnace gas recovery is an important industrial process, which can not only effectively utilize resources, but also reduce environmental pollution. In the blast furnace smelting process, the generated gas can be recycled after dust removal and purification, which can be used as energy supply and help improve production efficiency. However, there are also some problems in the recovery process. The staff in the factory found that due to the large amount of dust and particulate matter in the blast furnace gas, these substances are easy to form a certain thickness of scaling layer on the inner wall of the material pipe between the furnace top tank and the blast furnace top due to the influence of factors such as flow rate, temperature and pressure when flowing in the pipeline. The formation of the scaling layer is easy to cause the material pipe to be blocked, that is, after a long time of operation, this not only affects the gas circulation efficiency, but also may cause pipeline blockage, bringing inconvenience to production. On the other hand, since the temperature of the recovered gas is relatively high, usually around 300 degrees Celsius, it means that a large amount of heat energy is contained in it. However, this part of the heat energy has not been effectively utilized, resulting in energy waste. Therefore, it is necessary to improve the current blast furnace gas recovery system to further improve the operating efficiency and stability of the gas recovery system. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a blast furnace gas recovery system with a reasonable structural design, which can recover blast furnace gas and avoid pipeline blockage on the one hand, and recover the heat energy generated during gas recovery on the other hand.

[0004] The technical problem to be solved by the utility model is achieved through the following technical scheme: a blast furnace gas recovery system, the recovery system comprises a furnace top material tank and a blast furnace, the furnace top material tank is connected to the blast furnace top through a material pipe;

[0005] A nitrogen pipeline is connected to the furnace top material tank, and a nitrogen pipeline valve is installed at the gas outlet end of the nitrogen pipeline;

[0006] A nitrogen backflush pipeline is connected to the nitrogen pipeline, the inlet end of the nitrogen backflush pipeline is connected to the nitrogen pipeline, and the outlet end is connected between the inlet end and the outlet end of the material pipe, and nitrogen backflush pipeline valves are installed at the inlet end and the outlet end of the nitrogen backflush pipeline;

[0007] A material pipe valve is installed on the outlet end of the material pipe;

[0008] A primary dust removal pipeline is connected to the furnace top material tank, and a heat exchanger, a primary dust collector and a secondary dust collector are arranged in sequence on the dust removal pipeline according to the airflow direction, and a primary dust removal pipeline valve is installed on the inlet and outlet ends of the primary dust removal pipeline;

[0009] A secondary dust removal pipeline is connected to the furnace top material tank, the inlet end of the secondary dust removal pipeline is connected to the furnace top material tank, and the outlet end is connected to the primary dust removal pipeline between the heat exchanger and the primary dust collector, an atomizing dust collector is installed on the secondary dust removal pipeline, and secondary dust removal pipeline valves are installed on the inlet and outlet ends of the secondary dust removal pipeline;

[0010] A stop valve is installed between the heat exchanger of the primary dust removal pipeline and the gas outlet end of the secondary dust removal pipeline.

[0011] Preferably, the primary dust collector and the secondary dust collector are bag dust collectors.

[0012] Preferably, the primary dust collector and the secondary dust collector are installed in series on the primary dust removal pipeline.

[0013] Preferably, flow valves and pressure gauges are provided on both the nitrogen pipeline and the nitrogen backflush pipeline.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] (1) The blast furnace gas recovery system is equipped with a nitrogen backflush pipeline for backflush of the material pipe, and an atomizing dust collector is arranged on the nitrogen backflush pipeline. When the scaling layer attached to the inner wall of the material tank is backflushed through the nitrogen backflush pipeline, the atomizing dust collector can filter and remove the particles under the blow, thereby avoiding blockage of the material pipe to a certain extent, thereby affecting the circulation of the airflow;

[0016] (2) During the recovery of coal gas, since this part of the coal gas contains a large amount of thermal energy, the heat exchanger added to the first-level dust removal pipeline can recover the heat energy generated during the recovery of the coal gas, thereby avoiding energy waste and making the system more environmentally friendly and energy-saving to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure: 1. Furnace top material tank; 2. Material pipe; 3. Blast furnace top; 4. Nitrogen pipeline valve; 5. Nitrogen pipeline; 6. Nitrogen backflush pipeline; 7. Material pipe valve; 8. Primary dust removal pipeline; 9. Heat exchanger; 10. Primary dust collector; 11. Secondary dust collector; 12. Secondary dust removal pipeline; 13. Atomizing dust collector; 14. Secondary dust removal pipeline valve; 15. Stop valve. DETAILED DESCRIPTION

[0019] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0020] Example 1, reference Figure 1 , a blast furnace gas recovery system, the recovery system comprises a furnace top material tank 1 and a blast furnace, the furnace top material tank 1 is connected to the blast furnace top 3 through a material pipe 2;

[0021] A nitrogen pipeline 5 is connected to the furnace top material tank 1, and a nitrogen pipeline valve 4 is installed at the gas outlet end of the nitrogen pipeline 5;

[0022] A nitrogen backflush pipeline 6 is connected to the nitrogen pipeline 5, the inlet end of the nitrogen backflush pipeline 6 is connected to the nitrogen pipeline 5, and the outlet end is connected between the inlet end and the outlet end of the material pipe 2, nitrogen backflush pipeline valves are installed at the inlet end and the outlet end of the nitrogen backflush pipeline 6, and flow valves and pressure gauges are provided on the nitrogen pipeline 5 and the nitrogen backflush pipeline 6;

[0023] A material pipe valve 7 is installed on the outlet end of the material pipe 2;

[0024] A primary dust removal pipeline 8 is connected to the furnace top material tank 1, and a heat exchanger 9, a primary dust collector 10 and a secondary dust collector 11 are arranged on the dust removal pipeline in sequence according to the airflow direction. A primary dust removal pipeline valve is installed on the inlet and outlet ends of the primary dust removal pipeline. The primary dust collector 10 and the secondary dust collector 11 are installed in series on the primary dust removal pipeline 8, and the primary dust collector 10 and the secondary dust collector 11 are bag dust collectors;

[0025] A secondary dust removal pipeline 12 is connected to the furnace top material tank 1, the inlet end of the secondary dust removal pipeline 12 is connected to the furnace top material tank 1, and the outlet end is connected to the primary dust removal pipeline 8 between the heat exchanger 9 and the primary dust collector 10, an atomizing dust collector 13 is installed on the secondary dust removal pipeline 12, and a secondary dust removal pipeline valve 14 is installed on the inlet and outlet ends of the secondary dust removal pipeline 12;

[0026] A stop valve 15 is installed between the heat exchanger 9 of the primary dust removal pipeline 8 and the gas outlet end of the secondary dust removal pipeline 12 .

[0027] When the blast furnace gas recovery system is used, the nitrogen pipeline 5 supplies gas to the furnace top material tank 1, so that the gas in the furnace top material tank 1 is entrained into the primary dust removal pipeline 8, and the primary dust collector 10 and the secondary dust collector 11 on the primary dust removal pipeline 8 remove the impurity particles entrained in the gas. The gas after dust removal is discharged from the outlet end of the primary dust removal pipeline 8 to the later process, and this part of the gas can be recovered;

[0028] When the material pipe 2 needs to be purged, the valve on the nitrogen backflush pipeline 6 can be opened, and the nitrogen gas source in the nitrogen pipeline 5 can be used to backflush the material pipe 2 through the nitrogen backflush pipeline 6. During the backflush, the material pipe valve 7 on the outlet end of the material pipe 2 and the valve and stop valve 15 at the inlet end of the primary dust removal pipeline 8 are kept in a closed state. At this time, the atomizing dust collector 13 filters and absorbs the scaling particles generated during the backflush, and the airflow after the dust removal by the atomizing dust collector 13 enters the primary dust collector 10 and the secondary dust collector 11 for further filtration and absorption.

[0029] It should be noted that during the gas recovery period, since this part of the gas contains a large amount of thermal energy, the heat exchanger 9 added to the first-level dust removal pipeline 8 can exchange the heat energy generated during the gas recovery and recover this part of the heat energy, thereby avoiding energy waste and making the system more environmentally friendly, energy-saving, and economical to a certain extent.

Claims

1. A blast furnace gas recovery system, characterized in that: The recovery system includes a furnace top material tank and a blast furnace, wherein the furnace top material tank is connected to the blast furnace top through a material pipe; A nitrogen pipeline is connected to the furnace top material tank, and a nitrogen pipeline valve is installed at the gas outlet end of the nitrogen pipeline; A nitrogen backflush pipeline is connected to the nitrogen pipeline, the inlet end of the nitrogen backflush pipeline is connected to the nitrogen pipeline, and the outlet end is connected between the inlet end and the outlet end of the material pipe, and nitrogen backflush pipeline valves are installed at the inlet end and the outlet end of the nitrogen backflush pipeline; A material pipe valve is installed on the outlet end of the material pipe; A primary dust removal pipeline is connected to the furnace top material tank, and a heat exchanger, a primary dust collector and a secondary dust collector are arranged in sequence on the dust removal pipeline according to the airflow direction, and a primary dust removal pipeline valve is installed on the inlet and outlet ends of the primary dust removal pipeline; A secondary dust removal pipeline is connected to the furnace top material tank, the inlet end of the secondary dust removal pipeline is connected to the furnace top material tank, and the outlet end is connected to the primary dust removal pipeline between the heat exchanger and the primary dust collector, an atomizing dust collector is installed on the secondary dust removal pipeline, and secondary dust removal pipeline valves are installed on the inlet and outlet ends of the secondary dust removal pipeline; A stop valve is installed between the heat exchanger of the primary dust removal pipeline and the gas outlet end of the secondary dust removal pipeline.

2. A blast furnace gas recovery system according to claim 1, characterized in that: The primary dust collector and the secondary dust collector are bag dust collectors.

3. A blast furnace gas recovery system according to claim 1, characterized in that: The primary dust collector and the secondary dust collector are installed in series on the primary dust removal pipeline.

4. A blast furnace gas recovery system according to any one of claims 1 to 3, characterized in that: Flow valves and pressure gauges are installed on the nitrogen pipeline and the nitrogen backflush pipeline.

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