Stepped pre-combustion furnace for treating cement dangerous waste

Abstract

The utility model discloses a stepped pre-combustion furnace for treating cement dangerous waste, which comprises a furnace body, a feeding chamber is arranged at the top of the furnace body, a rotatable spiral conveyor is mounted in the feeding chamber, the spiral conveyor is driven by an external motor, and a feeding port is arranged on the feeding chamber. And a first tertiary air inlet is formed in the feeding chamber. The top of the furnace body is provided with a second tertiary air inlet, and the second tertiary air inlet is provided with an adjusting valve. The utility model relates to the technical field of cement hazardous waste treatment, in particular to a stepped pre-combustion furnace for treating cement hazardous waste, which is characterized in that two groups of tertiary air inlets are arranged, hot air in a cement kiln is introduced into a feeding chamber and a furnace body, the hazardous waste is dried by the hot air, moisture in the hazardous waste is removed, and further, the hazardous waste is further treated by the hot air. And the mincing roller is arranged at the inlet of the furnace body and can be used for mincing the hazardous waste, so that the hazardous waste is combusted more sufficiently, and residues are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cement hazardous waste disposal, in particular to a stepped pre-combustion furnace for treating cement hazardous waste. Background Art

[0002] Cement hazardous waste includes sludge, paint slag, slag, activated carbon, rectification residue, waste liquid, etc. Among them, the components and characteristic pollutants of paint slag and rectification residue are complex, and their components vary depending on the raw materials used in the rectification process, but most of them contain aromatic compounds, hydrocarbon-based compounds, hydrocarbon derivatives, tar and other components. Usually, it is a viscous liquid or solid.

[0003] At present, the common method for treating the above-mentioned hazardous waste is to introduce the hazardous waste into a pre-combustion furnace, ignite the hazardous waste through high temperature, and the combustion products enter the decomposition furnace for re-combustion, and finally form cement clinker after calcination.

[0004] Due to the large viscosity of the hazardous waste, in fact, the hazardous waste often cannot be effectively burned in the pre-combustion furnace, and part of the hazardous waste will adhere to the inner wall of the pre-combustion furnace, thus forming a blockage. For this reason, engineers usually install air cannons on the steps. For example, a new type of stepped pre-combustion furnace disclosed in the Chinese authorized patent CN218469089 U can blow the hazardous waste to prevent adhesion to a certain extent through the air cannons, but it is difficult to completely eliminate the adhesion phenomenon of the hazardous waste only by the air cannons. Therefore, engineers have to regularly open the pre-combustion furnace for blockage cleaning work. Summary of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a stepped pre-combustion furnace for treating cement hazardous waste, and solves the problem of low disposal efficiency of the existing pre-combustion furnace.

[0007] (2) Technical Solutions

[0008] To achieve the above purpose, the utility model provides the following technical solutions: A stepped pre-combustion furnace for treating cement hazardous waste, including a furnace body, a feeding chamber is arranged at the top of the furnace body, a rotatable screw feeder is installed in the feeding chamber, the screw feeder is driven by an external motor, and a feeding port is arranged on the feeding chamber.

[0009] A first inlet for tertiary air is arranged on the feeding chamber.

[0010] A second inlet for tertiary air is arranged at the top of the furnace body, and a regulating valve is arranged on the second inlet for tertiary air.

[0011] A fuel platform is arranged in the furnace body, and stepped steps are arranged on the side of the fuel platform.

[0012] A humidity sensor is also arranged inside the furnace body.

[0013] A rotatable crushing roller is arranged inside the furnace body, and the crushing roller is located at the entrance of the furnace body.

[0014] A plurality of air cannons are arranged outside the furnace body, and the air outlets of the air cannons are directly opposite to the steps.

[0015] A hydraulic cylinder is arranged inside the fuel platform, a push plate is installed at the free end of the hydraulic cylinder, and the push plate is embedded on the steps.

[0016] A discharge port is arranged at the bottom of the furnace body.

[0017] As a further preference, a plurality of diversion platforms are arranged on the inner wall of the furnace body.

[0018] As a further preference, an exhaust gas discharge port is arranged on the furnace body, a switching valve is arranged on the exhaust gas discharge port, and an activated carbon filter layer is installed inside the exhaust gas discharge port.

[0019] As a further preference, an exhaust gas pipe is installed at the outlet of the exhaust gas discharge port, the end of the exhaust gas pipe is inserted into a waste liquid absorption tank, and a tail discharge port is arranged on the waste liquid absorption tank.

[0020] (III) Beneficial effects

[0021] The utility model provides a stepped pre-combustion furnace for treating cement hazardous waste. It has the following

[0022] beneficial effects:

[0023] For the stepped pre-combustion furnace for treating cement hazardous waste, by arranging two groups of tertiary air inlets, the hot air in the cement kiln is introduced into the feeding chamber and the furnace body. The hazardous waste is dried by the hot air to remove the moisture therein. Further, a crushing roller is arranged at the entrance of the furnace body to crush the hazardous waste, so that it burns more fully and reduces the existence of residues. Furthermore, by arranging air cannons and hydraulic cylinders, the remaining hazardous waste can be turned over and cleaned to prevent it from adhering in the furnace. Finally, the hazardous waste is fully burned during the process of passing through multiple steps, thereby improving the disposal efficiency. Description of the drawings

[0024] Figure 1 It is a schematic structural diagram of the utility model.

[0025] In the figure: 1. Furnace body; 2. Feeding chamber; 3. Screw feeder; 4. Motor; 5. Feeding port; 6. First inlet for tertiary air; 7. Second inlet for tertiary air; 8. Regulating valve; 9. Fuel platform; 10. Steps; 11. Humidity sensor; 12. Crushing roller; 13. Air cannon; 14. Hydraulic cylinder; 15. Pusher plate; 16. Discharge port; 17. Flow guiding platform; 18. Exhaust gas discharge port; 19. On-off valve; 20. Activated carbon filter layer; 21. Exhaust gas discharge pipe; 22. Waste liquid absorption tank; 23. Tail discharge port. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] As Figure 1 shown, the present invention provides a technical solution: a stepped pre-combustion furnace for treating cement hazardous waste, including a furnace body 1. A feeding chamber 2 is arranged at the top of the furnace body 1. A rotatable screw feeder 3 is installed in the feeding chamber 2. The screw feeder 3 is driven by an external motor 4. A feeding port 5 is arranged on the feeding chamber 2.

[0028] A first inlet 6 for tertiary air is arranged on the feeding chamber 2.

[0029] A second inlet 7 for tertiary air is arranged at the top of the furnace body 1. A regulating valve 8 is arranged on the second inlet 7 for tertiary air. It should be noted that the hot air temperature (800 - 1250 degrees) introduced by the second inlet 7 for tertiary air is higher than that of the first inlet 6 for tertiary air. Therefore, the hazardous waste can be easily ignited.

[0030] An inclined fuel platform 9 is arranged inside the furnace body 1. Under the blowing of the hot air, the hazardous waste burns while sliding down along the platform to the steps 10. A stepped structure of steps 10 is arranged on the side of the fuel platform 9.

[0031] A humidity sensor 11 is also arranged inside the furnace body 1. The humidity inside the furnace body 1 can be detected through the humidity sensor 11, so as to control the air intake volume of the second inlet 7 for tertiary air through the regulating valve 8.

[0032] A rotatable crushing roller 12 (made of high-temperature resistant ball mill cast iron material, with a high temperature resistance of about 1500 degrees) is arranged inside the furnace body 1. The crushing roller 12 is located at the entrance of the furnace body 1.

[0033] A plurality of air cannons 13 are arranged outside the furnace body 1. The air outlets of the air cannons 13 are directly facing the steps 10.

[0034] The interior of the fuel platform 9 is provided with a hydraulic cylinder 14 (which needs to be treated with a high-temperature resistant coating, with a high-temperature resistance above 1000 degrees). The free end of the hydraulic cylinder 14 is installed with a push plate 15 (made of high-temperature resistant nodular cast iron material, with a high-temperature resistance of about 1500 degrees). The push plate 15 is embedded on the step 10. A plurality of flow guiding platforms 17 are arranged on the inner wall of the furnace body 1. The purpose of setting the flow guiding platforms 17 is that when the air cannon 13 blows the hazardous waste, after the hazardous waste is guided by the flow guiding platforms 17, it can return to the step 10 again to continue burning.

[0035] An exhaust gas discharge port 18 is arranged on the furnace body 1. A switching valve 19 is arranged on the exhaust gas discharge port 18. An activated carbon filter layer 20 is installed in the exhaust gas discharge port 18. An exhaust gas discharge pipe 21 is installed at the outlet of the exhaust gas discharge port 18. The end of the exhaust gas discharge pipe 21 is inserted into a waste liquid absorption tank 22. A tail discharge port 23 is arranged on the waste liquid absorption tank 22. The exhaust gas generated during the combustion of the hazardous waste is discharged through the exhaust gas discharge port 18. After being filtered by the activated carbon filter layer 20, it then enters the waste liquid absorption tank 22 through the exhaust gas discharge pipe 21. The waste liquid absorption tank 22 contains a desulfurization treatment liquid, which can absorb the sulfides in the exhaust gas. The exhaust gas is finally discharged through the tail discharge port 23. It should be noted that this exhaust gas treatment mechanism is only an auxiliary waste discharge mechanism, and the main exhaust gas in the furnace body 1 ultimately directly enters the decomposition furnace and burns out.

[0036] An outlet 16 is arranged at the bottom of the furnace body 1.

[0037] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0038] During use, the hazardous waste enters the feeding chamber 2 through the feeding port 5. The motor 4 is started to drive the spiral feeder 3 to rotate, thereby conveying the hazardous waste. Hot air from the cement kiln is introduced through the first inlet 6 of the tertiary air, thereby drying the hazardous waste.

[0039] Before the hazardous waste enters the furnace body 1, an external motor is used to drive the crushing roller 12 to rotate, thereby crushing the hazardous waste to make its volume smaller and more convenient for full combustion.

[0040] After that, open the regulating valve 8 and introduce the hot air from the cement kiln through the second air inlet 7 of the tertiary air. The hot air rapidly raises the temperature inside the furnace body 1, thus igniting the hazardous waste. The hazardous waste starts to burn on the fuel platform 9. During the burning process, the hazardous waste slides down from the inclined fuel platform 9 to the steps 10 on the right. To prevent the hazardous waste from sticking to the steps 10, turn on the air cannon 13 to blow the hazardous waste, thereby turning it over. At the same time, supply air (oxygen) into the furnace body 1 to enable the continuous burning of the hazardous waste. After that, turn on the hydraulic cylinder 14 and push the hazardous waste onto the next layer of steps 10 through the push plate 15. Repeat this process in sequence until the hazardous waste is completely burned. Then, the residue can be discharged through the discharge port 16.

[0041] In summary, for this stepped pre-combustion furnace used for treating cement hazardous waste, by setting two groups of tertiary air inlets, the hot air in the cement kiln is introduced into the feeding chamber and the furnace body. The hot air dries the hazardous waste to remove the moisture therein. Further, a crushing roller is provided at the furnace body inlet to crush the hazardous waste, so as to enable it to burn more fully and reduce the existence of residues. Even further, by setting the air cannon and the hydraulic cylinder, the remaining hazardous waste can be turned over and cleaned to prevent it from sticking inside the furnace. Finally, the hazardous waste is fully burned during the process of passing through multiple steps, thus improving the disposal efficiency.

[0042] It should be noted that the electrical components mentioned in this text are all electrically connected to an external main controller and 220V or 380V mains electricity. And the main controller can be a conventional known device such as a computer that plays a control role. Its control principle, internal structure, and control switch method, etc. are all conventional means of the existing technology and are directly cited here without further elaboration. In this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stepped pre-combustion furnace for treating cement hazardous waste, characterized in that: The furnace body (1) comprises a feeding chamber (2) disposed on the top of the furnace body (1), a rotatable screw feeder (3) being installed in the feeding chamber (2), the screw feeder (3) being driven by an external motor (4), and a feeding port (5) being disposed on the feeding chamber (2); The feed chamber (2) is provided with a first tertiary air inlet (6); A second tertiary air inlet (7) is provided at the top of the furnace body (1), and a regulating valve (8) is provided on the second tertiary air inlet (7); A fuel platform (9) is arranged in the furnace body (1), and a stepped step (10) is arranged on the side of the fuel platform (9); A humidity sensor (11) is also provided in the furnace body (1); A rotatable grinding roller (12) is arranged in the furnace body (1), and the grinding roller (12) is located at the entrance of the furnace body (1); A plurality of air cannons (13) are arranged outside the furnace body (1), and air outlets of the air cannons (13) face the step (10); A hydraulic cylinder (14) is arranged inside the fuel platform (9), a push plate (15) is installed at the free end of the hydraulic cylinder (14), and the push plate (15) is embedded in the step (10); A discharge port (16) is provided at the bottom of the furnace body (1).

2. A stepped pre-combustion furnace for treating cement hazardous waste according to claim 1, characterized in that: The inner wall of the furnace body (1) is provided with a plurality of flow guide platforms (17).

3. The step-type pre-combustion furnace for treating cement hazardous waste according to claim 1 is characterized in that: The furnace body (1) is provided with a waste gas discharge port (18), a switch valve (19) is provided on the waste gas discharge port (18), and an activated carbon filter layer (20) is installed in the waste gas discharge port (18).

4. The step-type pre-combustion furnace for treating cement hazardous waste according to claim 3 is characterized in that: A waste gas discharge pipe (21) is installed at the outlet of the waste gas discharge port (18), the end of the waste gas discharge pipe (21) is inserted into a waste liquid absorption tank (22), and a tail discharge port (23) is provided on the waste liquid absorption tank (22).

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