Purification system for iron-making raw gas of European smelting furnace

Abstract

The utility model belongs to the technical field of gas purification, and particularly discloses an European smelting furnace ironmaking raw gas purification system which comprises an European smelting furnace, a pipeline I communicated with the European smelting furnace, a cyclone dust collector communicated with the pipeline I, a pipeline II communicated with a bag-type dust collector, a pipeline III communicated with the bag-type dust collector, and a pipeline III communicated with the pipeline II. The pipeline III is communicated with a residual pressure turbine generator, the residual pressure turbine generator is communicated with a pipeline IV, the pipeline IV is communicated with a washing tower, the washing tower is communicated with a pipeline V, and the pipeline V is communicated with a gas cabinet. In the prior art, gas purification needs to consume a large amount of water resources. According to the coal gas washing device, the coal gas is subjected to dust removal treatment before being subjected to water washing treatment, then part of pressure and heat energy of the coal gas are converted into mechanical energy through the residual pressure turbine generator, so that the original high-temperature and high-pressure coal gas is cooled and decompressed, and then the low-temperature and low-pressure coal gas is introduced into the washing tower to be subjected to water washing treatment; the original water for cooling and reducing the pressure of the coal gas is saved, and the water resource consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas purification, in particular to a raw coal gas purification system for ironmaking in an Ouye furnace. Background Art

[0002] my country's steel industry consumes a large amount of resources, which are converted into fuel in the form of coal gas. The Ouye furnace has the advantages of flexible operation and the ability to use coal for direct smelting, which greatly reduces the dependence on coke and is perfectly compatible with traditional steelmaking processes. The essence of the Ouye furnace is to separate the reduction zone and the soft melting zone in the traditional blast furnace smelting process, realizing a new non-blast furnace ironmaking process that uses power coal as the main fuel and raw ore, sintering, and pellets as raw materials. The reduction function of iron oxides is carried out in the Ouye reduction shaft furnace, and the melting is carried out in the Ouye gasifier. At the same time, the gasifier also serves as a gasification function. The gasifier uses coal foam and coal injection as the main fuels, with a small amount of coke added. Pure oxygen is supplied from the lower tuyeres of the gasifier, which reacts with the fuel in the furnace to form high-temperature, highly reducing coal gas, thereby producing a large amount of coal gas while producing molten iron.

[0003] The basic method for purifying coal gas under existing technology is to perform preliminary purification of the coal gas by dry dust removal or wet dust removal on the way to the user, then wash the coal gas with water using a venturi tube, and finally deliver the purified gas to the user for use.

[0004] However, since the raw gas for ironmaking has a high temperature and a high pressure in the gas transmission pipeline, simply using a venturi tube to wash the gas with water will result in high-temperature and high-pressure gas. The gas contains a large amount of energy, and a large amount of water is needed to cool the gas. This will lead to a large degree of water resource consumption, and the energy contained in the gas will also be lost in vain. Utility Model Content

[0005] The purpose of the utility model is to provide a raw gas purification system for ironmaking in an Ouye furnace, so as to solve the problem that a large amount of water resources needs to be consumed in gas purification under the existing technology.

[0006] In order to achieve the above-mentioned purpose, the basic solution provided by the utility model is: a raw gas purification system for ironmaking in an Ouye furnace, including an Ouye furnace, the Ouye furnace is connected to a pipeline one, the other end of the pipeline one is connected to a cyclone dust collector, the cyclone dust collector is connected to a pipeline two, the other end of the pipeline two is connected to a bag dust collector, the bag dust collector is connected to a pipeline three, the other end of the pipeline three is connected to a waste pressure turbine generator, the waste pressure turbine generator is connected to a pipeline four, the other end of the pipeline four is connected to a washing tower, the washing tower is connected to a pipeline five, and the other end of the pipeline five is connected to a gas tank.

[0007] The principle and beneficial effect of the present invention are as follows: before the coal gas is subjected to water washing treatment, the dust content of the coal gas is reduced to a great extent by combining dry dust removal with wet dust removal, and then a part of the pressure energy and heat energy contained in the coal gas is converted into mechanical energy by a waste pressure turbine generator. The waste pressure turbine generator can convert this part of the mechanical energy into electrical energy and utilize it. After the above process, the temperature and pressure of the originally high-temperature and high-pressure coal gas are reduced, and then the low-temperature and low-pressure coal gas is passed into a washing tower for water washing treatment, which saves water originally used to cool and reduce the pressure of the coal gas, thereby reducing water resource consumption.

[0008] Option 2, which is the preferred basic option, has a valve 1 on pipe 3. Valve 1 is a pressure regulating valve, which can be used to control the pressure and flow of the gas.

[0009] Option 3, a preferred alternative to Option 2, connects Pipeline 3 to Pipeline 6, with both ends of Pipeline 6 connected to Pipeline 3. Pipeline 6 is equipped with Valves 2 and 3, located on one side of Valve 1 and the other side of Valve 1, respectively. Valves 2 and 3 are pressure-regulating valves. By connecting a branch pipe in parallel to Pipeline 3, they maintain normal gas flow and control gas pressure and flow in the event that Valve 1 fails to operate.

[0010] Option 4, the preferred alternative to the basic option, connects Pipeline 3 to Pipeline 7, the other end of which is connected to Pipeline 4. Valve 4 is installed at one end of Pipeline 7, and valve 5 is installed at the other end. By connecting a branch pipe in parallel to the residual pressure turbine generator line, normal gas delivery can be maintained even if the residual pressure turbine generator is inoperative.

[0011] Solution 5, a preferred alternative to the basic solution, connects Pipeline 4 to Pipeline 8, the other end of which is connected to a safety relief tower. Valve 6 is installed on Pipeline 8. The safety relief tower allows for the safe combustion and release of substandard gas from the gas pipeline before it is released to users, ensuring that the gas available to users meets quality standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The diagram is a structural diagram of a raw gas purification system for ironmaking in a European metallurgical furnace. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below through specific implementation methods:

[0014] The figure marks in the drawings of the specification include: Ouye furnace 1, pipeline one 2, cyclone dust collector 3, pipeline two 4, bag dust collector 5, pipeline three 6, residual pressure turbine generator 7, pipeline four 8, washing tower 9, pipeline five 10, gas tank 11, valve one 12, pipeline six 13, valve two 14, valve three 15, pipeline seven 16, valve four 17, valve five 18, pipeline eight 19, safety release tower 20, valve six 21.

[0015] Example

[0016] like Figure 1 As shown: A raw gas purification system for ironmaking in an Ouye furnace, comprising an Ouye furnace 1, connected to the Ouye furnace 1 is a pipe 2, the other end of the pipe 2 is connected to a cyclone dust collector 3, the cyclone dust collector 3 is connected to a pipe 2 4, the other end of the pipe 2 4 is connected to a bag dust collector 5, the bag dust collector 5 is connected to a pipe 3 6, the other end of the pipe 3 6 is connected to a pressure turbine generator 7, the pressure turbine generator 7 is connected to a pipe 4 8, the other end of the pipe 4 8 is connected to a washing tower 9, the washing tower 9 is connected to a pipe 5 10, and the other end of the pipe 5 10 is connected to a gas tank 11.

[0017] A valve one 12 is provided on pipeline three 6, and pipeline three 6 is connected to pipeline six 13. Both ends of pipeline six 13 are connected to pipeline three 6. Pipeline six 13 is provided with valve two 14 and valve three 15. Valve two 14 and valve three 15 are located on one side of valve one 12 and the other side of valve one 12 respectively. Pipeline three 6 is connected to pipeline seven 16. The other end of pipeline seven 16 is connected to pipeline four 8. One end of pipeline seven 16 is provided with valve four 17. The other end of pipeline seven 16 is provided with valve five 18. Pipeline four 8 is connected to pipeline eight 19. The other end of pipeline eight 19 is connected to a safety relief tower 20. Pipeline eight 19 is provided with valve six 21.

[0018] The implementation method of this embodiment is as follows:

[0019] When the coal gas needs to be purified, the coal gas in the Ouye furnace 1 is first passed into the cyclone dust collector 3 through the pipeline 1 2. The cyclone dust collector 3 performs preliminary dust removal on the coal gas. Then the coal gas enters the bag dust collector 5 through the pipeline 2 4. The bag dust collector 5 further removes the dust on the coal gas. Then the coal gas enters the residual pressure turbine generator 7 through the pipeline 3 6. At the same time, the control valve 12 adjusts the coal gas flow. The residual pressure turbine generator 7 cools and reduces the pressure of the coal gas. Then the coal gas enters the washing tower 9 through the pipeline 4 8. The washing tower 9 washes the coal gas with water. Then the coal gas enters the gas tank 11 through the pipeline 5 10. The purified coal gas is stored in the gas tank 11.

[0020] The above is only an embodiment of the present invention, and the common knowledge of the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A raw gas purification system for ironmaking in a European metallurgical furnace, characterized in that: The invention comprises an Ouye furnace (1), wherein the Ouye furnace (1) is connected to a pipe 1 (2), the other end of the pipe 1 (2) is connected to a cyclone dust collector (3), the cyclone dust collector (3) is connected to a pipe 2 (4), the other end of the pipe 2 (4) is connected to a bag dust collector (5), the bag dust collector (5) is connected to a pipe 3 (6), the other end of the pipe 3 (6) is connected to a pressure turbine generator (7), the pressure turbine generator (7) is connected to a pipe 4 (8), the other end of the pipe 4 (8) is connected to a washing tower (9), the washing tower (9) is connected to a pipe 5 (10), and the other end of the pipe 5 (10) is connected to a gas tank (11).

2. The raw gas purification system for ironmaking in a European metallurgical furnace according to claim 1, characterized in that: The pipeline three (6) is provided with a valve one (12).

3. The raw gas purification system for ironmaking in a European metallurgical furnace according to claim 2, characterized in that: The pipeline three (6) is connected to the pipeline six (13), and both ends of the pipeline six (13) are connected to the pipeline three (6). The pipeline six (13) is provided with a valve two (14) and a valve three (15), and the valve two (14) and the valve three (15) are respectively located on one side of the valve one (12) and the other side of the valve one (12).

4. The raw gas purification system for ironmaking in a European metallurgical furnace according to claim 1, characterized in that: The pipeline three (6) is connected to the pipeline seven (16), the other end of the pipeline seven (16) is connected to the pipeline four (8), one end of the pipeline seven (16) is provided with a valve four (17), and the other end of the pipeline seven (16) is provided with a valve five (18).

5. The raw gas purification system for ironmaking in a European metallurgical furnace according to claim 1, characterized in that: The pipeline 4 (8) is connected to the pipeline 8 (19), the other end of the pipeline 8 (19) is connected to the safety release tower (20), and the pipeline 8 (19) is provided with a valve 6 (21).

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