Cement kiln tertiary air duct for waste liquid treatment

Abstract

The utility model discloses a cement kiln tertiary air duct for waste liquid disposal, which comprises a decomposing furnace, a rotary kiln, a kiln head cover and a tertiary air duct, the bottom of the decomposing furnace is communicated with the rotary kiln, the rotary kiln is connected with the kiln head cover, and the tertiary air duct is respectively connected with the decomposing furnace and the kiln head cover. The tertiary air pipe comprises a vertical pipe, a flat pipe and an inclined pipe, and a waste liquid spray gun is arranged on the vertical pipe. And a gate valve and an access door are respectively arranged on the flat pipe. The utility model relates to the technical field of cement production, adopts a tertiary air pipe to feed air in a single-side tangential manner, and is convenient to control the tertiary air volume. And the tertiary air volume or temperature can be flexibly adjusted according to the requirement of the waste liquid adding amount. The newly added tertiary air pipe vertical pipe part is equivalent to a small incinerator, and most waste liquid incineration can be completed in the tertiary air pipe vertical pipe. And the waste liquid can be gasified and combusted in the tertiary air pipe vertical pipe with the temperature of about 900 DEG C, so that the interference on the calcining system in the decomposing furnace is reduced, the waste liquid treatment amount is favorably improved, and the calcining system is favorably stabilized.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a cement kiln tertiary air duct used for waste liquid disposal. Background Art

[0002] The existing cement kiln coordinated waste liquid disposal system has three shortcomings: first, the addition point is located in the lower middle part of the decomposition furnace, resulting in unstable calcination temperature, reduced output, increased energy consumption and other problems; second, the tertiary air ducts take in air from both sides of the decomposition furnace, resulting in uneven air distribution and poor temperature control, which also has a certain adverse effect on waste liquid disposal; third, the existing spray gun has a limited waste liquid disposal capacity, and waste liquids of different calorific values ​​need to be pre-matched.

[0003] In order to increase the amount of waste liquid treated and stabilize the thermal system of cement kiln, a cement kiln tertiary air duct for waste liquid treatment was developed. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a cement kiln tertiary air duct for waste liquid disposal, which solves the problem of unreasonable air duct design in the existing cement kiln hazardous waste treatment system.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cement kiln tertiary air duct for waste liquid disposal, comprising a decomposition furnace, a rotary kiln, a kiln head hood and a tertiary air duct, the bottom of the decomposition furnace is connected to the rotary kiln, the rotary kiln is connected to the kiln head hood, and the tertiary air duct is respectively connected to the decomposition furnace and the kiln head hood.

[0008] The tertiary air duct includes a vertical pipe, a horizontal pipe and an inclined pipe, and a waste liquid spray gun is arranged on the vertical pipe.

[0009] The horizontal pipes are respectively provided with gate valves and inspection doors.

[0010] A ash cleaning pipe is arranged in the middle section of the inclined pipe, and a flap valve is arranged at the discharge port of the ash cleaning pipe.

[0011] As further preferred, the waste liquid spray gun includes a low calorific value waste liquid spray gun and a high calorific value waste liquid spray gun.

[0012] As a further preference, an air cannon is provided on one side of the flat tube.

[0013] As a further preference, the riser is located on the side of the decomposition furnace and is arranged in parallel with the decomposition furnace.

[0014] (III) Beneficial effects

[0015] The utility model provides a cement kiln tertiary air duct for waste liquid disposal, which has the following beneficial effects:

[0016] 1. The tertiary air duct is used for single-side tangential air inlet, which is convenient for controlling the tertiary air volume. The tertiary air volume or temperature can be flexibly adjusted according to the amount of waste liquid added.

[0017] 2. The newly added tertiary duct riser is equivalent to a small incinerator, and most of the waste liquid incineration can be completed in the tertiary duct riser. The waste liquid can be gasified and burned in the tertiary duct riser with a temperature of up to about 900℃, which reduces the interference with the calcination system in the decomposition furnace, which is beneficial to increase the waste liquid disposal volume and stabilize the calcination system.

[0018] 3. There are two waste liquid spray guns, which can be used for the disposal of different types of waste liquids, which is conducive to increasing the disposal volume.

[0019] 4. An air cannon is installed at the bottom of the tertiary air duct riser to facilitate the cleaning of the crust.

[0020] 5. A dust cleaning pipe is provided in the middle of the tertiary air duct to facilitate the cleaning of materials inside the tertiary air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model.

[0022] In the figure: 1. decomposition furnace; 2. rotary kiln; 3. kiln head hood; 4. tertiary air duct; 41. vertical pipe; 42. horizontal pipe; 43. inclined pipe; 5. waste liquid spray gun; 51. low calorific value waste liquid spray gun; 52. high calorific value waste liquid spray gun; 6. gate valve; 7. air cannon; 8. inspection door; 9. ash cleaning pipe; 10. flap valve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, the utility model provides a technical solution: a tertiary air duct of a cement kiln for waste liquid disposal, comprising a decomposition furnace 1, a rotary kiln 2, a kiln head hood 3 and a tertiary air duct 4 (the traditional design is two air ducts, and the present design adopts a single one), the bottom of the decomposition furnace 1 is connected to the rotary kiln 2, the rotary kiln 2 is connected to the kiln head hood 3, the tertiary air duct 4 is respectively connected to the decomposition furnace 1 and the kiln head hood 3, and the air inlet of the tertiary air duct 4 is located above the constriction below the second layer of the decomposition furnace 1.

[0025] The tertiary air duct 4 includes a vertical pipe 41, a horizontal pipe 42 and an inclined pipe 43. The vertical pipe 41 is located on the side of the decomposition furnace 1. The vertical pipe 41 is T-shaped and arranged in parallel with the decomposition furnace 1. A waste liquid spray gun 5 is provided on the vertical pipe 41. The waste liquid spray gun 5 includes a low calorific value waste liquid spray gun 51 and a high calorific value waste liquid spray gun 52.

[0026] The waste liquid spray gun 5 forms an angle of 15°-20° with the wall of the pipe where it is located, and the head of the spray gun faces the decomposition furnace 1. The waste liquid spray gun 5 needs to use compressed air to assist flow and dispersion.

[0027] The horizontal pipe 42 is provided with a gate valve 6 and an inspection door 8 respectively.

[0028] An air cannon 7 is provided on one side of the flat tube 42 (for the convenience of cleaning the crust).

[0029] A ash cleaning pipe 9 is provided in the middle section of the inclined pipe 43 , and a flap valve 10 is provided at the discharge port of the ash cleaning pipe 9 .

[0030] Meanwhile, the contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field.

[0031] When in use, the high-temperature exhaust gas generated by the rotary kiln 2 enters the tertiary air duct 4 through the kiln head hood 3, the gate valve 6 is opened, the exhaust gas enters the vertical pipe 41, and the waste liquid is sprayed into the vertical pipe 41 through two waste liquid spray guns 5. The waste liquid is gasified and calcined in a high-temperature environment. The exhaust gas (including dust) generated after combustion enters the decomposition furnace 1 through the horizontal section at the top of the vertical pipe 41, and the granular waste impurities fall into the horizontal pipe 42 and the inclined pipe 43 below. The flap valve 10 is opened to discharge the granular waste through the cleaning pipe 9.

[0032] It should be noted that the electrical components appearing in this article are all connected to the external main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device for controlling computers, etc. Its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, 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 terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cement kiln tertiary air duct for waste liquid disposal, characterized in that: The invention comprises a decomposition furnace (1), a rotary kiln (2), a kiln head cover (3) and a tertiary air duct (4); the bottom of the decomposition furnace (1) is connected to the rotary kiln (2), the rotary kiln (2) is connected to the kiln head cover (3), and the tertiary air duct (4) is respectively connected to the decomposition furnace (1) and the kiln head cover (3); The tertiary air duct (4) comprises a vertical pipe (41), a horizontal pipe (42) and an inclined pipe (43), and a waste liquid spray gun (5) is arranged on the vertical pipe (41); The horizontal pipe (42) is respectively provided with a gate valve (6) and an inspection door (8); A ash cleaning pipe (9) is arranged in the middle section of the inclined pipe (43), and a flap valve (10) is arranged at the discharge port of the ash cleaning pipe (9).

2. The cement kiln tertiary air duct for waste liquid disposal according to claim 1, characterized in that: The waste liquid spray gun (5) comprises a low calorific value waste liquid spray gun (51) and a high calorific value waste liquid spray gun (52).

3. The cement kiln tertiary air duct for waste liquid disposal according to claim 1, characterized in that: An air cannon (7) is provided on one side of the flat tube (42).

4. The cement kiln tertiary air duct for waste liquid disposal according to claim 1, characterized in that: The vertical pipe (41) is located on the side of the decomposition furnace (1) and is arranged in parallel with the decomposition furnace (1).

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