CN222173630U - A comprehensive treatment system for ammonia escape at the end of cement kiln - Google Patents

Abstract

The utility model discloses a cement kiln tail ammonia escape comprehensive disposal system, which comprises a kiln tail dust collector, wherein a tail exhaust fan is arranged on the kiln tail dust collector, a first air guiding pipe and a second air guiding pipe are respectively arranged at the air outlet position of the tail exhaust fan, and a first valve and a second valve are respectively arranged on the first air guiding pipe and the second air guiding pipe. The utility model relates to the technical field of cement environment-friendly treatment, in particular to a cement kiln tail ammonia escape comprehensive treatment system, which can realize the recycling of kiln tail waste gas waste heat in a grate cooler, can reduce waste heat waste, does not need to additionally use an ammonia adsorbent, and has lower ammonia escape treatment cost.

Description

Cement kiln tail ammonia escape comprehensive treatment system

Technical Field

The utility model relates to the technical field of cement environment-friendly treatment, in particular to a comprehensive treatment system for cement kiln tail ammonia escape.

Background

The SNCR or SCR technology adopted by the cement kiln denitration system generally has the problems of ammonia escape, on one hand, the ammonia escape causes the rise of denitration cost and has larger corrosiveness to relevant facilities such as a flue and the like, and on the other hand, secondary atmospheric environment pollution can be caused, and the main technical route of the treatment of the ammonia escape at present comprises the steps of reducing ammonia emission by optimizing a desulfurization and denitration system and a production process flow or equipment, adopting an ammonia adsorbent, recycling the ammonia and the like.

The utility model discloses a system for trapping and reutilizing cement kiln ammonia by escaping, which is disclosed in the application number CN202021686544.5. The ammonia escape, trapping and recycling system of the cement kiln comprises a multi-stage ammonia capturing device, a preheater and the preheater, wherein an ammonia adsorbent is arranged in each stage of ammonia capturing device, ammonia molecules in smoke can be adsorbed on the surface or the inside of the ammonia adsorbent, the preheater is connected with the multi-stage ammonia capturing device, and the preheater receives the ammonia adsorbent after the ammonia molecules are adsorbed and preheats the ammonia adsorbent to realize separation of ammonia and the ammonia adsorbent, so that the ammonia is reused. According to the system for trapping and recycling the cement kiln ammonia escape, provided by the embodiment of the utility model, the adsorption rate of ammonia is improved by arranging the multistage ammonia trapping device, and the problem of exceeding of ammonia in the flue gas emission process is solved. Meanwhile, ammonia gas and an ammonia gas adsorbent are separated in the preheater, so that the ammonia gas is reused, and resource waste is avoided. Although this technique can reduce ammonia slip, there may be a problem in that the use of an adsorbent causes an increase in environmental cost.

Disclosure of utility model

(One) solving the technical problems

Aiming at the defects of the prior art, the utility model provides a comprehensive treatment system for ammonia escape from the tail of a cement kiln, which solves the problem of low ammonia treatment efficiency in the existing cement production process.

(II) technical scheme

The cement kiln tail ammonia escape comprehensive treatment system comprises a kiln tail dust collector, wherein a tail exhaust fan is arranged on the kiln tail dust collector, a first air guiding pipe and a second air guiding pipe are respectively arranged at the position of an air outlet of the tail exhaust fan, and a first valve and a second valve are respectively arranged on the first air guiding pipe and the second air guiding pipe.

The Roots blower is arranged at the air outlet of the first air guiding pipe.

The device also comprises a decomposing furnace, wherein a denitration ammonia water spray gun is arranged at the top of the decomposing furnace, and the denitration ammonia water spray gun is communicated with the Roots blower.

The bottom of the decomposing furnace is communicated with the kiln tail of the rotary cement kiln, the kiln head of the rotary cement kiln is communicated with the grate cooler, a plurality of groups of grate cooler cooling fans are arranged outside the grate cooler, and the air outlet of the second air guiding pipe is communicated with the inlet of the grate cooler cooling fans.

As a further preferable mode, the air outlet of the tail exhaust fan is also communicated with a chimney.

(III) beneficial effects

The utility model provides a cement kiln tail ammonia escape comprehensive treatment system. The beneficial effects are as follows:

1. the waste heat of the waste gas at the kiln tail is recycled in the grate cooler, so that waste heat waste can be reduced;

2. The waste gas containing ammonia is fed into the decomposing furnace, so that the consumption of ammonia can be reduced, and meanwhile, the temperature of the assisted compressed air of the ammonia spray gun is increased, and the disturbance of the temperature of the decomposing furnace is reduced;

3. Part of waste gas at the kiln tail forms a closed loop, so that the discharge of the waste gas at the kiln tail and various pollutants thereof is reduced, and the ultra-low emission of the pollutants of the cement kiln is facilitated;

4. No ammonia adsorbent is needed, and the ammonia escape disposal cost is low.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model.

The device comprises a kiln tail dust collector, a tail exhaust fan, a first air guide pipe, a second air guide pipe, a first valve, a second valve, a Roots blower, a decomposing furnace, a denitration ammonia water spray gun, a cement rotary kiln, a grate cooler, a cooling fan and a chimney, wherein the kiln tail dust collector, the tail exhaust fan, the first air guide pipe, the second air guide pipe, the first valve, the second valve, the Roots blower, the decomposing furnace, the denitration ammonia water spray gun, the cement rotary kiln, the grate cooler and the cooling fan.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, the utility model provides a technical scheme that the cement kiln tail ammonia escape comprehensive treatment system comprises a kiln tail dust collector 1, a tail exhaust fan 2 is arranged on the kiln tail dust collector 1, a first air guiding pipe 3 and a second air guiding pipe 4 are respectively arranged at the air outlet position of the tail exhaust fan 2, a first valve 5 and a second valve 6 are respectively arranged on the first air guiding pipe 3 and the second air guiding pipe 4, and the air intake quantity can be respectively controlled through the first valve 5 and the second valve 6.

The air outlet of the tail exhaust fan 2 is also communicated with a chimney 13.

The Roots blower 7 is arranged at the air outlet of the first air guiding pipe 3.

The device also comprises a decomposing furnace 8, wherein a denitration ammonia water spray gun 9 is arranged at the top of the decomposing furnace 8, and the denitration ammonia water spray gun 9 is communicated with the Roots blower 7.

The bottom of the decomposing furnace 8 is communicated with the kiln tail of the rotary cement kiln 10, the kiln head of the rotary cement kiln 10 is communicated with the grate cooler 11, a plurality of groups of grate cooler cooling fans 12 are arranged outside the grate cooler 11, and the air outlet of the second air guide pipe 4 is communicated with the inlet of the grate cooler cooling fans 12.

And all that is not described in detail in this specification is well known to those skilled in the art.

When the flue gas containing ammonia components from the kiln tail dust collector 1 enters the tail exhaust fan 2 and is discharged through three channels, the first channel (the traditional channel) is directly discharged into the chimney 13, the second channel is led out through the first air guiding pipe 3 and is compressed by the Roots blower 7 to form compressed air for the denitration ammonia water spray gun 9, and the compressed air enters the decomposing furnace 8 together with ammonia water sprayed by the denitration ammonia water spray gun 9.

The third channel is to introduce the ammonia-containing waste gas into the grate cooler cooling fan 12 through the second air introducing pipe 4 and enter the grate cooler 11 for combustion, so that the ammonia escape amount can be reduced, and the emission of other pollutants can be reduced.

In conclusion, the system can realize multi-way comprehensive recycling of ammonia in kiln tail waste gas, reduce emission of various pollutants at the kiln tail and improve the heat energy utilization rate of the waste gas.

It should be noted that, the electrical components appearing in this document are all electrically connected to the external master controller and 220V or 380V mains supply, and the master controller may be a conventional known device for controlling a computer, etc., and the control principle, the internal structure, the control switching manner, etc. of the master controller are all conventional means in the prior art, and are directly cited herein, which are not repeated herein, and relational terms such as first and second, etc. are used solely to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. The cement kiln tail ammonia escape comprehensive treatment system is characterized by comprising a kiln tail dust collector (1), wherein a tail exhaust fan (2) is arranged on the kiln tail dust collector (1), a first air guiding pipe (3) and a second air guiding pipe (4) are respectively arranged at the position of an air outlet of the tail exhaust fan (2), and a first valve (5) and a second valve (6) are respectively arranged on the first air guiding pipe (3) and the second air guiding pipe (4);

a Roots blower (7) is arranged at the air outlet of the first air guiding pipe (3);

The device also comprises a decomposing furnace (8), wherein a denitration ammonia water spray gun (9) is arranged at the top of the decomposing furnace (8), and the denitration ammonia water spray gun (9) is communicated with the Roots blower (7);

The bottom of the decomposing furnace (8) is communicated with the kiln tail of the rotary cement kiln (10), the kiln head of the rotary cement kiln (10) is communicated with the grate cooler (11), a plurality of groups of grate cooler cooling fans (12) are arranged outside the grate cooler (11), and the air outlet of the second air guiding pipe (4) is communicated with the inlet of the grate cooler cooling fans (12).

2. The cement kiln tail ammonia escape comprehensive treatment system according to claim 1, wherein the air outlet of the tail exhaust fan (2) is also communicated with a chimney (13).