Device for treating high-salinity wastewater by using kiln tail gas and recycling high-salinity wastewater

Abstract

The utility model discloses a device for treating and recycling high-salinity wastewater by using kiln tail gas, which comprises a wastewater tail gas reaction tank, a kiln and a high-salinity wastewater storage tank, a chimney of the kiln is connected with a gas inlet end of a gas conveying pipeline, and a gas outlet end of the gas conveying pipeline is inserted into the wastewater tail gas reaction tank; a water pipe is connected to the high-salinity wastewater storage tank, the other end of the water pipe is inserted into the wastewater tail gas reaction tank, a water pump is mounted on the water pipe and pumps high-salinity wastewater in the high-salinity wastewater storage tank into the wastewater tail gas reaction tank, and the gas outlet end of the gas conveying pipeline is located below the liquid level of the high-salinity wastewater in the wastewater tail gas reaction tank. According to the device, the tail gas generated by the kiln can be collected and used for treating high-salinity wastewater, the purpose of recycling water is achieved, emission of the tail gas is reduced, generated solid by-products are high in purity and can be developed into by-products for use, environmental pollution is reduced, and meanwhile benefits can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of kiln tail gas treatment. Specifically, it is a device for treating high-salt wastewater with kiln tail gas and recycling it. Background Art

[0002] The treatment methods of high-salt wastewater mainly include: evaporation method, electrolysis method, membrane separation method, incineration method, biological method, etc. The high-efficiency evaporation technology can successfully separate the salt and water in the wastewater and then treat them separately, which is a relatively thorough method for treating high-salt wastewater. Therefore, this technology is currently widely used in the coal chemical industry, pharmaceutical industry, and pesticide industry. However, for brine with too high content of organic pollutants, foam is very easy to generate during the evaporation process, causing material washing, and at the same time, it may also affect the quality of salt, resulting in excessive organic matter entrained in the produced salt, and further treatment is still required; the biological method has a high removal rate and is suitable for treating wastewater with high water quality requirements and relatively stable water quality. However, it is not good at adapting to water quality changes, the oxygen supply cannot be fully utilized, the air supply is evenly distributed along the pool level, resulting in insufficient oxygen in the front section and excessive oxygen in the rear section, and the aeration structure is huge, occupying a large area; the membrane separation method has compact process equipment, less land occupation, high-quality and stable effluent water quality, and high organic matter removal efficiency. However, the membrane cost is high, making the capital investment of the membrane bioreactor higher than that of the traditional sewage treatment process. Membrane fouling is easy to occur, bringing inconvenience to operation and management, and having relatively high requirements for the process and energy consumption.

[0003] There is a need for a device that collects and centrally treats high-salt wastewater from industrial production and exhaust gas emissions, reduces the waste salt ions in the water for recycling, and at the same time reduces the impact of kiln tail gas on the environment. Summary of the Utility Model

[0004] For this reason, the technical problem to be solved by the utility model is to provide a device for treating high-salt wastewater with kiln tail gas and recycling it, which can reduce the salt content in the high-salt wastewater and recycle it.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A device for treating high-salt wastewater with kiln tail gas and recycling it, including a wastewater and tail gas reaction tank, a kiln, and a high-salt wastewater storage tank. The chimney of the kiln is connected to the intake end of a gas transmission pipeline, the outlet end of the gas transmission pipeline is inserted into the wastewater and tail gas reaction tank, a water pipe is connected to the high-salt wastewater storage tank, the other end of the water pipe is inserted into the wastewater and tail gas reaction tank, and a water pump is installed on the water pipe. The water pump pumps the high-salt wastewater in the high-salt wastewater storage tank into the wastewater and tail gas reaction tank, and the outlet end of the gas transmission pipeline is located below the liquid level of the high-salt wastewater in the wastewater and tail gas reaction tank.

[0006] The above-mentioned device for treating high-salt wastewater with kiln exhaust gas and recycling it, the wastewater exhaust gas reaction tank includes a tank body, a sealing cover and a gas transmission branch pipe, the sealing cover is installed on the top of the tank body, and a support frame is fixedly connected to the inner wall of the tank body, the gas transmission branch pipe is arranged in the wastewater exhaust gas reaction tank along the height direction of the wastewater exhaust gas reaction tank, the gas transmission branch pipe is fixedly connected to the support frame, the air inlet end of the gas transmission branch pipe passes through the sealing cover and is connected to a pneumatic butterfly valve, and the air outlet end of the gas transmission branch pipe extends to the bottom of the tank body; the air outlet end of the gas transmission pipe is connected to the air inlet end of the pneumatic butterfly valve.

[0007] The above-mentioned device for treating high-salt wastewater with kiln tail gas and recycling it, the wastewater tail gas reaction tank is equipped with an annular pipe, the annular pipe is provided with a circular hole, and the outlet end of the gas transmission branch pipe is fluid-conducting with the annular pipe.

[0008] The above-mentioned device for treating high-salt wastewater with kiln exhaust gas and recycling it, has four gas transmission branch pipes arranged in the tank body along its circumferential direction, and the gas transmission branch pipes are installed in the tank body at equal intervals; the gas outlet end of the gas transmission pipe is respectively connected to the pneumatic butterfly valves on the four gas transmission branch pipes through a diversion pipe.

[0009] In the above-mentioned device for treating high-salt wastewater using kiln tail gas and recycling it, an inspection port is arranged on the side wall of the tank body, and legs are fixedly connected to the bottom of the tank body on all sides.

[0010] The above-mentioned device for treating high-salt wastewater with kiln exhaust gas and recycling it, a stirring shaft is coaxially installed in the tank body, an agitator is installed on the stirring shaft, one end of the stirring shaft passes through the sealing cover, a reduction motor is installed on the top of the sealing cover through a bracket, and the output shaft of the reduction motor is transmission-connected to the end of the stirring shaft through a coupling.

[0011] In the above-mentioned device for treating high-salt wastewater using kiln tail gas and recycling it, the agitator is provided with three layers along the axial direction of the agitator shaft, and the agitator is a 6-blade disc turbine.

[0012] In the above-mentioned device for treating high-salt wastewater using kiln tail gas and recycling it, a Roots blower is installed on the gas delivery pipeline.

[0013] The above-mentioned device for treating high-salt wastewater with kiln exhaust gas and recycling it, the bottom of the wastewater exhaust gas reaction tank is provided with a discharge port, the discharge port is fluidly connected with the water inlet of the solid-liquid separator through a pipeline, the water outlet of the solid-liquid separator is connected with the circulating water storage tank through a pipeline, and a filter is installed on the pipeline.

[0014] In the above device for treating high-salt wastewater by using the tail gas of a kiln and recycling it, a conveyor belt is arranged below the solid discharge port of the solid-liquid separator, and the other end of the conveyor belt is arranged above the solid by-product storage tank.

[0015] The technical solution of the present utility model has achieved the following beneficial technical effects:

[0016] 1. The device in the present utility model can collect the tail gas generated by the kiln and use it to treat high-salt wastewater, achieving the purpose of recycling water and reducing the emission of tail gas.

[0017] 2. The solid by-products generated in the present utility model have a relatively high purity and can be developed into by-products for use. While reducing environmental pollution, it can also increase benefits. Description of the Drawings

[0018] Figure 1 Schematic diagram of the present utility model for conveying high-salt wastewater and kiln tail gas into the wastewater and tail gas reaction tank;

[0019] Figure 2 Schematic diagram of the structure of the wastewater and tail gas reaction tank of the present utility model;

[0020] Figure 3 Schematic diagram of the sewage filtration structure discharged from the wastewater and tail gas reaction tank of the present utility model.

[0021] The reference numerals in the drawings are represented as follows: 1-kiln; 2-chimney; 3-gas transmission pipeline; 4-Roots blower; 5-shunt pipe; 6-wastewater and tail gas reaction tank; 601-tank body; 602-gas transmission branch pipeline; 603-pneumatic butterfly valve; 604-annular pipeline; 605-round hole; 606-leg; 607-agitating shaft; 608-agitator; 609-reduction motor; 610-coupling; 611-maintenance opening; 612-discharge port; 613-support frame; 614-sealing cover; 7-high-salt wastewater storage tank; 8-water pump; 9-water pipe; 10-solid-liquid separator; 11-circulating water storage tank; 12-inlet; 13-conveyor belt; 14-solid by-product storage tank. Detailed Embodiments

[0022] In this embodiment, a device for treating high-salt wastewater by using the tail gas of a kiln and recycling it is as Figure 1As shown in the figure, it includes a waste gas reaction tank 6, a kiln 1 and a high-salt wastewater storage tank 7. The chimney 2 of the kiln 1 is connected to the intake end of a gas transmission pipeline 3. The outlet end of the gas transmission pipeline 3 is inserted into the waste gas reaction tank 6. The main pipeline has a diameter of φ377. The mass fraction of CO2 in the waste gas is ≥5% and ≤40%. A Roots blower 4 is installed on the gas transmission pipeline 3 to pressurize the waste gas. A water pipe 9 is connected to the high-salt wastewater storage tank 7, and the other end of the water pipe 9 is inserted into the waste gas reaction tank 6. A water pump 8 is installed on the water pipe 9. The water pump 8 pumps the high-salt wastewater in the high-salt wastewater storage tank 7 into the waste gas reaction tank 6. A filter and a valve are installed at the water outlet of the high-salt wastewater storage tank 7. The outlet end of the gas transmission pipeline 3 is located below the liquid level of the high-salt wastewater in the waste gas reaction tank 6.

[0023] As Figure 2 As shown in the figure, the waste gas reaction tank 6 includes a tank body 601, a sealing cover 614 and a gas transmission branch pipeline 602. The sealing cover 614 is installed on the top of the tank body 601. A support frame 613 is fixedly connected to the inner wall surface of the tank body 601. The gas transmission branch pipeline 602 is arranged in the waste gas reaction tank 6 along the height direction of the waste gas reaction tank 6. The gas transmission branch pipeline 602 is fixedly connected to the support frame 613. The intake end of the gas transmission branch pipeline 602 passes through the sealing cover 614 and is connected to a pneumatic butterfly valve 603. The outlet end of the gas transmission branch pipeline 602 extends towards the bottom of the tank body 601. The outlet end of the gas transmission pipeline 3 is connected to the intake end of the pneumatic butterfly valve 603.

[0024] As Figure 2As shown in the figure, four gas transmission branch pipes 602 are arranged along the circumferential direction inside the tank body 601, and the gas transmission branch pipes 602 are equidistantly installed inside the tank body 601; the outlet end of the gas transmission pipeline 3 is respectively connected to the pneumatic butterfly valves 603 on the four gas transmission branch pipes 602 through a shunt pipe 5; an annular pipeline 604 is installed inside the wastewater tail gas reaction tank 6, and round holes 605 are opened on the annular pipeline 604, and the outlet end of each gas transmission branch pipe 602 is in fluid communication with the annular pipeline 604. After the kiln tail gas enters the gas transmission pipeline 3 through the chimney 2, it is pressurized and transported to the shunt pipe 5 by the Roots blower 4. The model of the Roots blower 4 is RRE-190(3HE-190), and it enters the four gas transmission branch pipes 602 respectively, and finally enters the annular pipeline 604 and is discharged from the round holes 605. The aperture of the round holes 605 is 10 mm, and the annular pipeline 604 is located at the bottom of the pipe. When the tail gas is discharged, it has a good dispersion effect, making the mixing of the tail gas and the high-salt wastewater more uniform. In this embodiment, the bottom of the tank body 601 is an outwardly protruding arc surface, the depth of the straight section of the tank body 601 is 6500 mm, the diameter is 4000 mm, the height of the high-salt wastewater liquid level inside the straight section of the tank body 601 is 4700 mm, and the diameter of the gas transmission branch pipe 602 is 133 mm.

[0025] As Figure 2 shown, a stirring shaft 607 is coaxially installed inside the tank body 601, a stirrer 608 is installed on the stirring shaft 607, the stirrer 608 is arranged in three layers along the axial direction of the stirring shaft 607, the stirrer 608 is a 6-blade inclined leaf disc turbine, the diameter of the stirrer 608 is 1300 mm, the distance between adjacent stirrers 608 is 1400 mm, the distance from the lowermost stirrer 608 to the bottom of the straight section of the tank body 601 is 500 mm, one end of the stirring shaft 607 passes through the sealing cover 614, a reduction motor 609 is installed on the top of the sealing cover 614 through a bracket, the output shaft of the reduction motor 609 is in transmission connection with the end of the stirring shaft 607 through a coupling 610, and the rotation speed of the stirrer 608 is 0 - 95 r / min.

[0026] As Figure 2-3As shown in the figure, a maintenance opening 611 is provided on the side wall of the tank body 601. Legs 606 are fixedly connected to the periphery of the bottom of the tank body 601. A discharge port 612 is provided on the bottom of the waste water and tail gas reaction tank 6. The discharge port 612 is fluidly connected to the water inlet 12 of the solid-liquid separator 10 through a pipeline. The water outlet of the solid-liquid separator 10 is connected to the circulating water storage tank 11 through a pipeline, and a filter is installed on the pipeline. A conveyor belt 13 is provided below the solid discharge port of the solid-liquid separator 10. The other end of the conveyor belt 13 is located above the solid by-product storage tank 14. After the solid-liquid separator 10 is opened, the filter cake naturally falls onto the conveyor belt 13 and is conveyed into the solid by-product storage tank 14 for storage.

[0027] Working principle: High-salt waste water is pumped into the waste water and tail gas reaction tank 6 by a water pump 8. The kiln tail gas from the ore calcining kiln 1 enters the gas transmission pipeline 3. Under the pressure of a Roots blower 4, it is introduced into the waste water and tail gas reaction tank 6, and an acid-base regulator is added to adjust the inside of the waste water and tail gas reaction tank 6 to an alkaline state [pH adjusted to between 8 and 10]. The pH regulator is magnesium oxide or is prepared by the following method: Limestone and magnesite are crushed to 5-50 mesh according to a mass ratio of 1:1 to 1:10, roasted at 400-700 °C for 2-4 h, and the heating rate is 5-10 °C / min; Immediately after the roasting is completed, the roasted product is water quenched, and the water temperature of the water used for water quenching is 40-60 °C. Preferably, the mass ratio of limestone to magnesite is 1:5, roasted at 600 °C for 4 h, and the heating rate is 10 °C / min; Immediately after the roasting is completed, the roasted product is water quenched, and the water temperature of the water used for water quenching is 55 °C. Start the reduction motor 609 to start stirring [the motor frequency is 20-50 Hz, and 30 Hz is used in this embodiment]. After the stirring is completed, open the discharge port 612, and the waste water enters the solid-liquid separator 10 through a pipeline for solid-liquid separation. The waste water separated by the solid-liquid separator 10 is transported to the circulating water storage tank 11 through a pipeline, and filtration is carried out synchronously during the transportation process. The solid separated by the solid-liquid separator 10 is dried and then sent to the solid by-product storage tank 14 through the conveyor belt 13 for storage. The collected solid by-products can be used as raw materials such as lime, and the treated water can be used for industrial production.

[0028] In actual treatment, the calcium ion content in the high-salt waste water changes greatly. The specific change data of calcium ions are as follows (by mass fraction):

[0029] Table 1. Comparison table of high-salt waste water before and after treatment

[0030] Experiment Serial Number <![CDATA[Ca before treatment 2+ > <![CDATA[Processed Ca 2+ > Experiment Serial Number <![CDATA[Ca before processing 2+ > <![CDATA[Processed Ca 2+ > 1 0.7157 0.0126 6 0.6759 0.0151 2 0.8341 0.0156 7 0.7711 0.0076 3 0.5619 0.0147 8 0.2707 0.0101 4 0.6998 0.0076 9 0.6149 0.0076 5 0.5443 0.0076 10 0.6206 0.0050

[0031] It can be seen from the data table that the calcium ion removal effect is remarkable.

[0032] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaustively list all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the claims of this patent application.

Claims

1. An apparatus for treating high-salt wastewater with kiln tail gas and recycling it, characterized in that, It includes a waste water and tail gas reaction tank (6), a kiln (1) and a high-salt waste water storage tank (7). The chimney (2) of the kiln (1) is connected to the intake end of a gas transmission pipeline (3). The outlet end of the gas transmission pipeline (3) is inserted into the waste water and tail gas reaction tank (6). A water pipe (9) is connected to the high-salt waste water storage tank (7), and the other end of the water pipe (9) is inserted into the waste water and tail gas reaction tank (6). A water pump (8) is installed on the water pipe (9), and the water pump (8) pumps the high-salt waste water in the high-salt waste water storage tank (7) into the waste water and tail gas reaction tank (6). The outlet end of the gas transmission pipeline (3) is located below the liquid level of the high-salt waste water in the waste water and tail gas reaction tank (6).

2. The device for treating high-salt wastewater by using kiln tail gas and recycling the same according to claim 1, characterized in that The waste water and tail gas reaction tank (6) includes a tank body (601), a sealing cover (614) and a gas transmission branch pipeline (602). The sealing cover (614) is installed on the top of the tank body (601). A support frame (613) is fixedly connected to the inner side wall surface of the tank body (601). The gas transmission branch pipeline (602) is arranged in the waste water and tail gas reaction tank (6) along the height direction of the waste water and tail gas reaction tank (6), and the gas transmission branch pipeline (602) is fixedly connected to the support frame (613). The intake end of the gas transmission branch pipeline (602) passes through the sealing cover (614) and is connected with a pneumatic butterfly valve (603). The outlet end of the gas transmission branch pipeline (602) extends towards the bottom of the tank body (601). The outlet end of the gas transmission pipeline (3) is connected to the intake end of the pneumatic butterfly valve (603).

3. The device for treating high-salt wastewater by using kiln tail gas and recycling the same according to claim 2, wherein, An annular pipeline (604) is installed in the waste water and tail gas reaction tank (6), and round holes (605) are formed in the annular pipeline (604). The outlet end of the gas transmission branch pipeline (602) is in fluid communication with the annular pipeline (604).

4. A device for treating high-salt wastewater by using kiln tail gas and recycling the treated wastewater according to claim 3, characterized in that, Four gas transmission branch pipelines (602) are arranged along the circumferential direction of the tank body (601), and the gas transmission branch pipelines (602) are installed in the tank body (601) at equal intervals. The outlet end of the gas transmission pipeline (3) is respectively connected to the pneumatic butterfly valves (603) on the four gas transmission branch pipelines (602) through a shunt pipe (5).

5. The device for treating high-salt wastewater by using kiln tail gas and recycling the treated wastewater according to claim 4, wherein An inspection opening (611) is arranged on the side wall of the tank body (601), and support legs (606) are fixedly connected to the periphery of the bottom of the tank body (601).

6. The device for treating high-salt wastewater by using kiln tail gas and recycling the treated wastewater according to claim 2, wherein, A stirring shaft (607) is coaxially installed in the tank body (601). A stirrer (608) is installed on the stirring shaft (607). One end of the stirring shaft (607) passes through the sealing cover (614). A reduction motor (609) is installed on the top of the sealing cover (614) through a bracket. The output shaft of the reduction motor (609) is in transmission connection with the end of the stirring shaft (607) through a coupling (610).

7. An apparatus for treating high-salt wastewater using kiln tail gas and recycling the treated wastewater according to claim 6, characterized in that, The stirrer (608) is arranged in three layers along the axial direction of the stirring shaft (607), and the stirrer (608) is a six-blade inclined blade disc turbine.

8. A device for treating high-salt wastewater by using kiln tail gas and recycling the treated wastewater according to claim 1, characterized in that, A Roots blower (4) is installed on the gas delivery pipeline (3).

9. A device for treating high-salt wastewater by using kiln tail gas and recycling the treated wastewater according to claim 1, characterized in that, A discharge port (612) is provided at the bottom of the waste water and tail gas reaction tank (6). The discharge port (612) is in fluid communication with the water inlet (12) of the solid-liquid separator (10) through a pipeline. The water outlet of the solid-liquid separator (10) is connected to the circulating water storage tank (11) through a pipeline, and a filter is installed on the pipeline.

10. The device for treating high-salt wastewater by using kiln tail gas and recycling the same according to claim 9, wherein, A conveyor belt (13) is provided below the solid discharge port of the solid-liquid separator (10), and the other end of the conveyor belt (13) is arranged above the solid by-product storage tank (14).

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