High-temperature and high-concentration powder steam dust purification system

Abstract

The utility model discloses a high-temperature and high-concentration powder steam dust purification system which is characterized in that the lower end of a steam dust conveying negative-pressure main pipeline is vertically connected with the feeding end of a first slurry making tank, and the upper end of the steam dust conveying negative-pressure main pipeline is connected with a gas inlet of a first condensation wetting trapping tower; a plate type condensation trapping device is arranged in the first condensation wetting trapping tower, a slurry collecting area at the bottom of the first condensation wetting trapping tower is connected with a slurry discharging pipe, and the slurry discharging pipe conveys the slurry to a second slurry making tank through a slurry conveying pipe; a gas outlet of the first condensation wetting trapping tower is connected with a gas inlet of the second condensation wetting trapping tower through a pipeline, slurry trapped by the stainless steel wire mesh type condensation trapping device flows downwards to a bottom slurry collecting position, and a bottom slurry collecting area of the second condensation wetting trapping tower is connected with a slurry discharging pipe. The slurry conveying pipe is conveyed to the second slurry making tank through the discharging pipe; and a gas outlet of the second condensation wetting trapping tower is connected to a chimney through a pipeline and a fan.

Description

Technical Field

[0001] The utility model belongs to the technical field of mineral processing, and in particular relates to a high-temperature and high-concentration powder gas and dust purification system. Background Art

[0002] my country's iron ore resources are mostly poor ores and few magnetic ores. Weakly magnetic and difficult-to-select iron ore accounts for more than 70% of the total reserves. Magnetization roasting is an effective method for processing weakly magnetic iron ore. In 2021, Jiugang built a suspension magnetization roasting production line with an annual processing capacity of 1.65 million tons. The roasted sand in the suspension roasting furnace is heat-exchanged in the waste heat boiler and then enters the pulping tank for pulping. Under normal circumstances, the water vapor and dust generated by the contact between the high-temperature roasted sand and water are transported through pipelines into the 280m 2 The bag dust collector was used for treatment. Because the temperature of the roasted sand discharged from the fluidized bed in the original design increased from below 200℃ to about 400℃, the temperature of the roasted sand entering the pulping tank increased, resulting in a significant increase in the water vapor and dust generated. 2 The bag filter cannot be used due to the large amount of water vapor entering the slurry tank. The water vapor and dust generated in the slurry tank all come out from the explosion-proof holes, which does not meet the environmental protection requirements. The dust concentration of the steam and dust coming out reaches 300g / m 3 , which is a high-concentration gas dust. There is no technology in China to purify this kind of high-concentration gas dust. The overall suspension roasting system can operate normally. The current difficulty is that it is difficult to find a suitable process method to deal with water vapor dust (semi-dry and semi-wet) so that the pulping tank can achieve the goal of no dust. Utility Model Content

[0003] The utility model provides a high-temperature and high-concentration powder gas dust purification system, which aims to purify semi-dry and semi-wet water vapor dust to meet the emission standards.

[0004] To this end, the utility model adopts the following technical solutions:

[0005] A high-temperature, high-concentration powder gas and dust purification system, comprising a first pulping tank, a second pulping tank, a negative pressure main pipeline for conveying gas and dust, a first condensation and wetting collection tower, a second condensation and wetting collection tower and a chimney;

[0006] The lower end of the steam and dust conveying negative pressure main pipeline is vertically connected to the feed end of the first pulping tank, and the upper end of the steam and dust conveying negative pressure main pipeline is connected to the gas inlet of the first condensation and wetting capture tower; a plate-type condensation and capture device is provided in the first condensation and wetting capture tower, and the mud captured by the plate-type condensation and capture device flows downward to the bottom mud collection area, and the bottom mud collection area of ​​the first condensation and wetting capture tower is connected to the mud external discharge pipe, and the external discharge pipe sends the mud conveying pipe to the second pulping tank;

[0007] The gas outlet of the first condensation and wetting capture tower is connected to the gas inlet of the second condensation and wetting capture tower through a pipeline. A stainless steel wire mesh condensation and capture device is provided in the second condensation and wetting capture tower. The mud captured by the stainless steel wire mesh condensation and capture device flows downward to the bottom mud collection area. The bottom mud collection area of ​​the second condensation and wetting capture tower is connected to the mud external discharge pipe, and the external discharge pipe delivers the mud delivery pipe to the second slurry making tank.

[0008] The gas outlet of the second condensation and wetting capture tower is connected to the chimney through a pipeline and a fan.

[0009] Furthermore, it also includes an air collecting hood and an air collecting branch pipe. The air collecting hood is arranged above the explosion-proof hole of the first pulping tank. One end of the air collecting branch pipe is connected to the air collecting hood, and the other end is connected to the middle part of the negative pressure main pipe for conveying steam and dust.

[0010] Furthermore, a plurality of condensation and wetting collection devices for reverse flow of water vapor and dust are installed at intervals on the inner wall of the vertical section of the negative pressure main pipeline for conveying steam and dust, and the reverse flow of water vapor is used to form a balanced foam layer to condense the steam.

[0011] The beneficial effects of the utility model are:

[0012] The invention uses high-temperature powder material to enter water and quench to produce high concentration (300g / m 3 ) steam and dust, through multiple condensation and wetting capture devices with reverse flow of water vapor and dust and multi-stage condensation and dust reduction in the first and second condensation and wetting capture towers, the exhaust gas can meet environmental protection requirements, reduce the annual emission of mineral powder by about 10,000 tons, create an annual benefit of 2.6 million yuan, and have significant environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the system principle diagram of the utility model;

[0014] In the figure: 1-the first pulp making tank, 2-the second pulp making tank, 3-the negative pressure main pipeline for conveying steam and dust, 4-the gas collecting hood, 5-the gas collecting branch pipe, 6-the first condensation and wetting capturing tower, 7-the second condensation and wetting capturing tower, 8-the chimney. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0016] like Figure 1 As shown, a high-temperature, high-concentration powder gas and dust purification system includes a first pulping tank 1, a second pulping tank 2, a negative pressure main pipeline 3 for conveying gas and dust, a first condensation and wetting capture tower 6, a second condensation and wetting capture tower 7 and a chimney 8.

[0017] The lower end of the steam and dust conveying negative pressure main pipeline 3 is vertically connected to the feed end of the first pulping tank 1, and the upper end of the steam and dust conveying negative pressure main pipeline 3 is connected to the gas inlet of the first condensation and wetting capture tower 6; it also includes a gas collecting hood 4 and a gas collecting branch pipe 5. The gas collecting hood 4 is arranged above the explosion-proof hole of the first pulping tank 1. One end of the gas collecting branch pipe 5 is connected to the gas collecting hood 4, and the other end is connected to the middle of the steam and dust conveying negative pressure main pipeline 3. A plurality of condensation and wetting capture devices for reverse flow of water vapor and dust are installed at intervals on the inner wall of the vertical section of the steam and dust conveying negative pressure main pipeline 3, and the steam is condensed by forming a balanced foam layer by the reverse flow of water vapor.

[0018] The first condensation and wetting capture tower 6 is provided with a plate-type condensation and capture device, and the mud captured by the plate-type condensation and capture device flows downward to the bottom mud collection area, and the bottom mud collection area of ​​the first condensation and wetting capture tower 6 is connected to the mud external discharge pipe, and the external discharge pipe sends the mud delivery pipe to the second pulping tank 2. The gas outlet of the first condensation and wetting capture tower 6 is connected to the gas inlet of the second condensation and wetting capture tower 7 through a pipeline, and the second condensation and wetting capture tower 7 is provided with a stainless steel wire mesh condensation and capture device, and the mud captured by the stainless steel wire mesh condensation and capture device flows downward to the bottom mud collection area, and the bottom mud collection area of ​​the second condensation and wetting capture tower 7 is connected to the mud external discharge pipe, and the external discharge pipe sends the mud delivery pipe to the second pulping tank 2.

[0019] The gas outlet of the second condensation and wetting capture tower 7 is connected to the chimney 8 through a pipeline and a fan.

[0020] The suspended roasting system of a mine with an annual processing capacity of 1.65 million tons was completed and put into use in 2021. Since the temperature of the roasted sand entering the pulping tank is as high as about 400°C, a large amount of steam and dust will emerge from the pulping tank, which does not meet the national environmental protection requirements. After the use of this process for treatment, the concentration of the discharged steam and dust is less than 20mg / m 3 , in line with environmental protection requirements.

Claims

1. A high-temperature, high-concentration powder dust purification system, characterized in that: It comprises a first pulp making tank (1), a second pulp making tank (2), a negative pressure main pipeline for conveying steam and dust (3), a first condensation and wetting collection tower (6), a second condensation and wetting collection tower (7) and a chimney; The lower end of the steam and dust conveying negative pressure main pipeline (3) is vertically connected to the feed end of the first pulping tank (1), and the upper end of the steam and dust conveying negative pressure main pipeline (3) is connected to the gas inlet of the first condensation and wetting capture tower (6); the first condensation and wetting capture tower (6) is provided with a plate-type condensation and capture device, and the mud captured by the plate-type condensation and capture device flows downward to the bottom mud collection area, and the bottom mud collection area of ​​the first condensation and wetting capture tower (6) is connected to the mud external discharge pipe, and the external discharge pipe sends the mud conveying pipe to the second pulping tank (2); The gas outlet of the first condensation and wetting capture tower (6) is connected to the gas inlet of the second condensation and wetting capture tower (7) through a pipeline. A stainless steel wire mesh condensation and wetting capture device is provided in the second condensation and wetting capture tower (7). The mud captured by the stainless steel wire mesh condensation and wetting capture device flows downward to the bottom mud collection area. The bottom mud collection area of ​​the second condensation and wetting capture tower (7) is connected to the mud external discharge pipe. The external discharge pipe delivers the mud conveying pipe to the second slurry making tank (2). The gas outlet of the second condensation and wetting capture tower (7) is connected to the chimney through a pipeline and a fan.

2. The high-temperature, high-concentration powder gas and dust purification system according to claim 1 is characterized in that: It also comprises an air collecting hood (4) and an air collecting branch pipe (5), wherein the air collecting hood (4) is arranged above the explosion-proof hole of the first pulp making tank (1), and the air collecting branch pipe (5) is connected to the air collecting hood (4) at one end and connected to the middle of the negative pressure main pipe (3) for conveying steam and dust at the other end.

3. The high-temperature, high-concentration powder gas and dust purification system according to claim 1 is characterized in that: A plurality of condensation and wetting collection devices for reverse flow of water vapor and dust are installed at intervals on the inner wall of the vertical section of the negative pressure main pipe (3) for conveying steam and dust, and the reverse flow of water vapor is used to form a balanced foam layer to condense the steam.

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