A rotary kiln tail gas treatment device

Abstract

The application discloses a rotary kiln tail gas treatment device, which comprises a rotary kiln, a tail gas treatment mechanism and a preheating mechanism, the rotary kiln comprises a preheating section and a heating section, the preheating mechanism is installed on the preheating section, the tail gas treatment mechanism comprises a spray tower and a connecting pipe, the connecting pipe is arranged in a V shape, the air inlet of the connecting pipe is communicated with the smoke outlet of the rotary kiln, the air outlet of the connecting pipe is communicated with the spray tower, a dust collecting box is connected to the bottom of the connecting pipe, a plurality of baffles are arranged in the connecting pipe at intervals, and the plurality of baffles are arranged in an inclined manner towards the dust collecting box. The rotary kiln tail gas treatment device can recycle the spraying water, and can fully utilize the heat in the tail gas to avoid waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary kiln, in particular to a rotary kiln tail gas treatment device. BACKGROUND

[0002] Rotary kiln refers to rotary calcination kiln (commonly known as rotary kiln), which belongs to building material equipment. Rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln according to different processing materials. The cement kiln is mainly used for calcining cement clinker, which can be divided into two categories: dry process cement kiln and wet process cement kiln. The metallurgical chemical kiln is mainly used for magnetizing roasting of lean iron ore in steel plant, oxidation roasting of chromium and nickel iron ore, roasting of high alumina bauxite in refractory material plant and roasting of clinker and aluminum hydroxide in aluminum plant. The lime kiln (i.e. active lime kiln) is used for roasting active lime and light-burned dolomite in steel plant and ferroalloy plant.

[0003] A large amount of dust and acid gas will be generated during the use of the rotary kiln, and the tail gas needs to be treated before being discharged. The existing rotary kiln tail gas treatment device only performs simple dust removal treatment during use, and cannot effectively absorb and treat the dust and acid gas in the rotary kiln tail gas, so that the dust and acid gas in the tail gas is discharged into the atmosphere, causing environmental pollution. In view of the above problems, the prior art adds a spray tower to remove the dust and acid gas in the tail gas, but the spray water is not recycled, and the heat of the tail gas is not utilized, so that the high-temperature tail gas is directly discharged into the atmosphere after spray treatment, causing waste. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a rotary kiln tail gas treatment device which can recycle the spray water and fully utilize the heat of the tail gas to avoid waste.

[0005] The purpose of the present application is achieved by the following technical scheme:

[0006] A rotary kiln tail gas treatment device, comprising a rotary kiln, a tail gas treatment mechanism and a preheating mechanism, wherein the rotary kiln comprises a preheating section and a heating section, the preheating mechanism is installed on the preheating section, the tail gas treatment mechanism comprises a spray tower and a connecting pipe, the connecting pipe is arranged in a V shape, the gas inlet of the connecting pipe is communicated with the smoke outlet of the rotary kiln, the gas outlet of the connecting pipe is communicated with the spray tower, the bottom of the connecting pipe is connected with a dust collection box, a plurality of baffles are arranged in the connecting pipe at intervals, and the plurality of baffles are arranged inclined towards the dust collection box, a spray pipe and a first filter screen are installed in the spray tower, the first filter screen is installed below the spray pipe, and the tail gas treatment mechanism further comprises an external water supply device connected with the spray pipe.

[0007] The preheating mechanism comprises a preheating chamber, a water inlet pipe and a water outlet pipe, the preheating chamber is installed outside the preheating section, the water outlet end of the water inlet pipe is communicated with the water inlet end of the spray tower, the water outlet end of the water inlet pipe is communicated with the preheating chamber, the water inlet end of the water outlet pipe is communicated with the preheating chamber, and the water outlet end of the water outlet pipe is communicated with the spray pipe.

[0008] Further, the preheating mechanism further comprises a filter box, the water inlet end of the filter box is communicated with the water outlet end of the spray tower, the water inlet end of the water inlet pipe is communicated with the filter box, and a second filter screen is arranged in the filter box.

[0009] Further, a sewage outlet is arranged at the lower end of the filter box.

[0010] Further, the lower end of the filter box and the lower end of the spray tower are funnel-shaped, the sewage outlet is located at the lowest end of the filter box, and the water outlet end of the spray tower is located at the lowest end of the spray tower.

[0011] Further, the second filter screen divides the internal space of the filter box into a filtering chamber and a connecting chamber, the sewage outlet and the water inlet end of the filter box are communicated with the filtering chamber, and the water inlet end of the water inlet pipe is communicated with the connecting chamber.

[0012] Further, a pipeline is arranged in the preheating chamber, the pipeline is spiral-shaped, the water inlet end of the pipeline is communicated with the water outlet end of the water inlet pipe, and the water outlet end of the pipeline is communicated with the water inlet end of the water outlet pipe.

[0013] Compared with the prior art, the beneficial effects of the present application are that:

[0014] The tail gas treatment mechanism and the preheating mechanism are arranged, so that the preheating section can be heated by the heated spray water, the heat in the tail gas is fully utilized, and the spray water flowing through the preheating section is reflowed into the spray pipe for recycling, thereby avoiding waste. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic view of the rotary kiln tail gas treatment device of the present application;

[0016] Figure 2 FIG. 4 is a structural schematic view of the preheating chamber of the rotary kiln tail gas treatment device of the present application;

[0017] Fig. 1, rotary kiln; 101, preheating section; 102, heating section; 2, tail gas treatment mechanism; 201, connecting pipe; 2011, baffle; 2012, dust collection box; 202, spray tower 202; 2021, spray pipe; 2022, first filter screen; 3, preheating mechanism; 301, preheating chamber; 3011, pipeline; 302, water inlet pipe; 303, drain pipe; 304, filter box; 3041, second filter screen; 3042, blowdown. DETAILED DESCRIPTION

[0018] The application will be further described below in conjunction with the drawings and specific embodiments. It should be noted that the embodiments described below or technical features thereof can be combined with each other to form new embodiments without conflict.

[0019] As Figure 1 With Figure 2 the rotary kiln tail gas treatment device of the application, comprising a rotary kiln 1, a tail gas treatment mechanism 2 and a preheating mechanism 3, the rotary kiln 1 comprises a preheating section 101 and a heating section 102, the preheating mechanism 3 is installed on the preheating section 101, the tail gas treatment mechanism 2 comprises a spray tower 202 and a connecting pipe 201, the connecting pipe 201 is arranged in a V shape, the gas inlet of the connecting pipe 201 is communicated with the smoke outlet of the rotary kiln 1, the gas outlet of the connecting pipe 201 is communicated with the spray tower 202, the bottom of the connecting pipe 201 is connected with a dust collection box 2012, a plurality of baffles 2011 are arranged in the connecting pipe 201, the plurality of baffles 2011 are arranged obliquely towards the dust collection box 2012, a spray pipe 2021 and a first filter screen 2022 are installed in the spray tower 202, the first filter screen 2022 is installed below the spray pipe 2021, the tail gas treatment mechanism 2 further comprises an external water supply device connected with the spray pipe 2021.

[0020] The preheating mechanism 3 comprises a preheating chamber 301, a water inlet pipe 302 and a drain pipe 303, the preheating chamber 301 is installed outside the preheating section 101, the water inlet end of the water inlet pipe 302 is communicated with the water outlet end of the spray tower 202, the water outlet end of the water inlet pipe 302 is communicated with the preheating chamber 301, the water inlet end of the drain pipe 303 is communicated with the preheating chamber 301, and the water outlet end of the drain pipe 303 is communicated with the spray pipe 2021.

[0021] In the present application, a water pump is also installed on the drain pipe 303 or the water inlet pipe 302 to facilitate the transportation of liquid.

[0022] When in use, the user sends the material into the preheating section 101, and then the material is sent into the heating section 102 by the conveying device in the rotary kiln 1, at this time, the heating device installed in the heating section 102 will heat the material in the heating section 102, and a large amount of waste gas will be generated during the heating process of the material, and the generated waste gas will enter the spray tower 202 through the connecting pipe 201, because a plurality of baffles 2011 are arranged in the connecting pipe 201, so that the large particles of dust existing in the waste gas are blocked by the baffles 2011 when the waste gas flows through the connecting pipe 201, and the large particles of dust blocked by the baffles 2011 will fall along the inner wall of the connecting pipe 201 under the action of gravity and be collected in the dust collecting box 2012, and because the plurality of baffles 2011 are arranged in an inclined manner towards the dust collecting box 2012, the dust blocked by the baffles 2011 can be avoided to be stuck at the connection between the baffles 2011 and the connecting pipe 201, and after the waste gas enters the spray tower 202, the spray pipe 2021 will spray liquid to the waste gas, so that the particles in the waste gas are settled and fall on the first filter screen 2022, and at the same time, the liquid will be heated by the heat carried by the waste gas during the contact with the waste gas, and then falls at the lower end of the spray tower 202, and is conveyed to the preheating chamber 301 through the water inlet pipe 302, so as to heat the preheating section 101 wrapped in the preheating chamber 301, thereby increasing the temperature of the material in the preheating section 101, so that the material can be heated more quickly in the heating section 102, thereby making full use of the preheating of the waste gas and reducing the energy consumption, in addition, the liquid will flow back to the spray pipe 2021 through the drain pipe 303 after flowing through the preheating chamber 301, so as to be reused, thereby effectively reducing the waste of water resources, and at the same time, in order to avoid the lack of liquid, the application also provides an external water supply device connected with the spray pipe 2021, so as to supplement the liquid for the spray tower 202 at any time.

[0023] The liquid in the application can be water or an alkaline solution, such as sodium bicarbonate.

[0024] In addition, in order to avoid too many impurities in the liquid flowing through the water inlet pipe 302, the preheating mechanism of the application further comprises a filter box 304, the water inlet end of the filter box 304 is in communication with the water outlet end of the spray tower 202, the water inlet end of the water inlet pipe 302 is in communication with the filter box 304, and the second filter screen 3041 is arranged in the filter box 304.

[0025] When in use, the liquid will enter the filter box 304 and be filtered through the second filter screen 3041 to remove the impurities existing in the liquid, so as to avoid that the liquid is conveyed into the preheating chamber 301 through the water inlet pipe 302 and accumulates in the preheating chamber 301 to block the preheating chamber 301.

[0026] Meanwhile, in order to facilitate the discharge of impurities, the filter box 304 is provided with a blowdown port 3042 at the lower end thereof, and the lower end of the filter box 304 and the lower end of the spray tower 202 are funnel-shaped, the blowdown port 3042 is located at the lowest end of the filter box 304, and the water outlet of the spray tower 202 is located at the lowest end of the spray tower 202, so that the impurities stored in the spray tower 202 can enter the filter box 304, and then be collected through the blowdown port 3042.

[0027] More specifically, the second filter screen 3041 divides the internal space of the filter box 304 into a filter chamber and a connecting chamber, the blowdown port 3042 and the water inlet end of the filter box 304 are communicated with the filter chamber, and the water inlet end of the water inlet pipe 302 is communicated with the connecting chamber.

[0028] By using the second filter screen 3041 to divide the internal space of the filter box 304 into a filter chamber and a connecting chamber, and by communicating the blowdown port 3042 and the water inlet end of the filter box 304 with the filter chamber and the water inlet end of the water inlet pipe 302 with the connecting chamber, the water inlet pipe 302 and the impurities in the liquid can be completely separated, thereby effectively preventing the impurities from entering the water inlet pipe 302, and in order to prevent the impurities from accumulating in the preheating chamber 301, a pipeline 3011 is arranged in the preheating chamber 301, the pipeline 3011 is spiral-shaped, the water inlet end of the pipeline 3011 is communicated with the water outlet end of the water inlet pipe 302, and the water outlet end of the pipeline 3011 is communicated with the water inlet end of the drain pipe 303. The pipeline 3011 is arranged in the preheating chamber 301 to effectively increase the flow rate of the liquid entering the preheating chamber 301, thereby reducing the probability of impurities in the liquid accumulating in the pipeline 3011, and the pipeline 3011 is spiral-shaped to heat the entire preheating section 101, and since the pipeline 3011 is spiral-shaped and has no dead angle, the impurities can be effectively prevented from being stuck, thereby further reducing the probability of impurities in the liquid accumulating in the pipeline 3011.

[0029] The mesh number of the second filter screen 3041 is greater than or equal to the mesh number of the first filter screen 2022.

[0030] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application, and any non-essential changes and substitutions made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A rotary kiln off-gas treatment apparatus, characterized by: The application relates to a rotary kiln (1), a tail gas treatment mechanism (2) and a preheating mechanism (3), wherein the rotary kiln (1) comprises a preheating section (101) and a heating section (102), the preheating mechanism (3) is installed on the preheating section (101), the tail gas treatment mechanism (2) comprises a spray tower (202) and a connecting pipe (201), the connecting pipe (201) is arranged in a V shape, the air inlet of the connecting pipe (201) is communicated with the smoke outlet of the rotary kiln (1), the air outlet of the connecting pipe (201) is communicated with the spray tower (202), the bottom of the connecting pipe (201) is connected with a dust collecting box (2012), a plurality of baffles (2011) are arranged in the connecting pipe (201) at intervals, the baffles (2011) are arranged in an inclined mode towards the dust collecting box, the spray tower (202) is provided with a spray pipe (2021) and a first filter screen (2022), the first filter screen (2022) is installed below the spray pipe (2021), and the tail gas treatment mechanism (2) further comprises an external water supply device connected with the spray pipe (2021). The preheating mechanism (3) comprises a preheating chamber (301), a water inlet pipe (302) and a water outlet pipe (303), the preheating chamber (301) is installed outside the preheating section (101), the water inlet end of the water inlet pipe (302) is communicated with the water outlet end of the spray tower (202), the water outlet end of the water inlet pipe (302) is communicated with the preheating chamber (301), the water inlet end of the water outlet pipe (303) is communicated with the preheating chamber (301), and the water outlet end of the water outlet pipe (303) is communicated with the spray pipe (2021).

2. A rotary kiln off-gas treatment apparatus according to claim 1, characterized in that: The preheating mechanism (3) further comprises a filter box (304), the water inlet end of the filter box (304) is communicated with the water outlet end of the spray tower (202), and the water inlet end of the water inlet pipe (302) is communicated with the filter box (304).

3. A rotary kiln off-gas treatment apparatus according to claim 2, characterised in that: The filter box (304) is provided with a blowdown port (3042) at the lower end.

4. A rotary kiln off-gas treatment apparatus according to claim 3, characterised in that: The lower end of the filter box (304) and the lower end of the spray tower (202) are arranged in a funnel shape, the blowdown port (3042) is located at the lowest end of the filter box (304), and the water outlet end of the spray tower (202) is located at the lowest end of the spray tower (202).

5. A rotary kiln off-gas treatment apparatus according to claim 3, characterised in that: The second filter screen (3041) divides the internal space of the filter box (304) into a filter chamber and a connecting chamber, the blowdown port (3042) and the water inlet end of the filter box (304) are communicated with the filter chamber, and the water inlet end of the water inlet pipe (302) is communicated with the connecting chamber.

6. A rotary kiln off-gas treatment apparatus according to claim 1, characterized in that: The preheating chamber (301) is provided with a pipeline (3011), the pipeline (3011) is arranged in a spiral shape, the water inlet end of the pipeline (3011) is communicated with the water outlet end of the water inlet pipe (302), and the water outlet end of the pipeline (3011) is communicated with the water inlet end of the water outlet pipe (303).

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