CN219300748U

CN219300748U - Decomposing furnace pre-combustion device for cement kiln

Info

Publication number: CN219300748U
Application number: CN202320205190.5U
Authority: CN
Inventors: 李明飞; 鄢载猛; 朱连杰; 汪伟; 刘万平; 金春华
Original assignee: Cino Technology Tianjin Co ltd
Current assignee: Cino Technology Tianjin Co ltd
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-07-04
Anticipated expiration: 2033-02-14

Abstract

The utility model relates to the technical field of solid waste and dangerous waste disposal, in particular to a decomposing furnace pre-combustion device for a cement kiln; the device comprises a step incinerator and a rotary incinerator, wherein the front end of the step incinerator is in a step shape, a feed inlet of the step incinerator is connected with a solid waste alternative fuel inlet, and a discharge outlet at the rear end of the step incinerator is connected with a feed inlet of the rotary incinerator; the rear end of the rotary incinerator is communicated with a kiln tail decomposing furnace; the device can solve the treatment problem of massive solid waste, has wider application range, reduces the influence of the solid waste on a sintering system, improves the disposal capacity of the solid waste, and realizes the recycling, harmless and reduction treatment of the solid waste.

Description

Decomposing furnace pre-combustion device for cement kiln

Technical Field

The utility model relates to the technical field of solid waste and dangerous waste disposal, in particular to a decomposing furnace pre-combustion device for a cement kiln.

Background

Urban household garbage treatment is a main factor affecting urban environmental sanitation management. How to properly treat the municipal solid waste is a great difficulty in the current environmental sanitation treatment, and if the municipal solid waste can be converted into usable resources, the environmental sanitation problem can be solved, and the effect of saving energy can be achieved.

The kiln tail system cooperative device in the current novel dry cement production line is widely applied to the aspect of household garbage disposal, and has obvious advantages in disposal cost and pollution control; not only can the calcination and decomposition time of the solid waste dangerous waste outside the kiln be prolonged through the kiln tail system cooperative device, but also the moisture in the solid waste dangerous waste is reduced, and the influence on the kiln calcination system is reduced; meanwhile, the household garbage can be intensively treated, and the heat value of the solid waste fossil fuel in the garbage can be fully utilized, so that harmless, recycling and reduction treatment of the solid waste hazardous waste are realized.

Patent CN 215723231U discloses a cement kiln solid waste disposal device, has set up a solid waste disposal device by the decomposition furnace, and the device main part is a step furnace, carries out the preliminary treatment earlier before getting into firing system to solid waste danger waste, reduces the influence of solid waste danger waste to firing system, accords with the production demand. In addition, the solid waste and dangerous waste can enter the step furnace after being pretreated.

Patent CN 216431735U provides a horizontal rotary incinerator and a material supply system for disposing hazardous waste, wherein the hazardous waste can enter the rotary incinerator after being pretreated; the pretreatment process comprises the steps of unloading, classifying, screening, crushing, matching and conveying, and meanwhile, deodorizing and fire fighting are also needed to be paid attention to, so that the purposes of increasing the treatment capacity of the rotary incinerator, enabling hazardous wastes to be fed smoothly and adapting to various hazardous wastes as much as possible are achieved.

In the two technical schemes, no matter the step furnace or the rotary incinerator, when the solid waste and dangerous waste enter the front of the furnace, firstly, relatively complex pretreatment processes are carried out on the dangerous waste, when the waste with poor adaptability, large granularity and large volume weight is faced, the pretreatment time and the pretreatment difficulty are increased, and the pretreated waste can not be ensured to meet the heating conditions in the step furnace or the rotary incinerator; secondly, the rotation speed of the rotary incinerator is controllable, but even though the state of the pretreated dangerous waste is screened, the conditions such as materials, humidity and the like are difficult to unify, and the burn-out rate of the waste is affected; the rotary incinerator is at a certain angle with the horizontal direction, waste is convenient to move to a discharge hole in the rotary incineration process, the waste is easy to accumulate at the bottom of the rotary incinerator in the moving process, the step furnace can reduce the problem that the waste is accumulated in the furnace, but solid waste dangerous waste in the step furnace is easy to adhere to the inner wall of the furnace, so that cracks, scaling and deformation occur in the step inside the incinerator, the inside of the step furnace is heated unevenly, and the step furnace is difficult to clean and maintain.

Therefore, the combustion time of the solid waste and the hazardous waste outside the decomposing furnace is prolonged to a certain extent in both the single step furnace and the single rotary furnace, and compared with the decomposing furnace, the working pressure of a part of the decomposing furnace is reduced, but the pretreatment time and the cleaning maintenance work of the step furnace or the rotary furnace are increased.

Disclosure of Invention

In order to solve the problems mentioned in the background art and overcome the defects, the utility model provides the following technical scheme:

the utility model provides a cement kiln is with decomposition furnace precombustion device, precombustion device front end connects solid useless alternative fuel entry, precombustion device rear end is connected with the decomposition furnace, precombustion device is by solid useless alternative fuel entry to the direction that the decomposition furnace pointed, is a cement kiln is with decomposition furnace precombustion device from front to back direction of operation, gyration incinerator rear end and kiln tail decomposition furnace intercommunication, cement kiln is with decomposition furnace precombustion device, and the holistic incline direction of device is by high to low arranging: and the three air inlets on the step incinerator are sequentially lowered from the direction from the tertiary air inlet on the step incinerator to the rotary incinerator to the kiln tail decomposing furnace.

The utility model provides a cement kiln is with decomposition furnace precombustion device includes ladder burning furnace and gyration burning furnace, ladder burning furnace front end bottom is the ladder, and the front end top is equipped with tertiary air entry, ladder burning furnace feed inlet is connected with solid useless alternative fuel entry, ladder burning furnace rear end discharge gate is connected with gyration burning furnace feed inlet, and further be equipped with spiral feeding device between ladder burning furnace feed inlet and the solid useless alternative fuel entry, spiral feeding device sets up being close to ladder burning furnace feed inlet one side.

The whole of the step incinerator is inclined at a certain angle with the horizontal plane from the front to the back in the direction from the feed inlet to the discharge outlet, the tertiary air inlet arranged at the top of the step incinerator is the highest point of the step incinerator, and the discharge outlet of the step incinerator is the lowest point of the joint of the step incinerator and the rotary incinerator.

Further, a plurality of steps are arranged at the bottom of the step incinerator from front to back and from high to low, and the number of the steps can be adjusted according to production requirements; the air cannon is arranged on the step, and a plurality of air cannons can be arranged on the step according to the requirement; the air blowing system can adjust the spraying frequency of the air cannon as required, so that solid waste and dangerous waste in the step incinerator are stirred in the step incinerator, the step is fully preheated, the solid waste and dangerous waste is prevented from being attached to a step after being burnt, the step is difficult to clean, and meanwhile, the preheating and drying time of the solid waste and dangerous waste in the step incinerator can be adjusted and controlled.

Further, the step height in the step incinerator is 200-800mm, and the number of the steps is preferably 5-20 steps; the number of air cannons on each step is preferably 3-5.

Further, two raw material discharging openings are formed in the rear end of the tertiary air inlet at the top of the stepped incinerator; one of the raw material discharging openings is arranged above the part, provided with the step, of the bottom of the front end of the stepped incinerator, and the other raw material discharging opening is arranged at the position, close to the discharge opening, of the rear end of the stepped incinerator and above the position, without the step, of the front end of the discharge opening.

Further, the step incinerator discharge port is connected with the rotary incinerator feed port, a sliding chute is arranged on the side face inside the step incinerator discharge port and inside the rotary incinerator feed port, and the preheated solid waste and dangerous waste enter the rotary incinerator from the step incinerator through the sliding chute.

The rotary incinerator is characterized in that two ends of the bottom of the rotary incinerator are respectively provided with a cylinder supporting device, the whole rotary incinerator is supported by the cylinder supporting devices to form a certain angle with the horizontal direction, and the inclination angle is preferably set to be 3-5 degrees; a rotary driving mechanism is arranged in the cylinder supporting device to drive the rotary incinerator to rotate; the cylinder supporting device rotates clockwise, and the rotary incinerator rotates anticlockwise; the rotation speed of the rotary incinerator can be controlled through the rotary driving device, the preheated and dried solid waste is conveyed to the discharge port through the feed port, and meanwhile, the pre-incineration time of the solid waste in the rotary incineration stage incinerator is controlled.

Further, scraping teeth with different densities are arranged in the rotary incinerator from the feed inlet to the discharge outlet, and scraping arrangement at the feed inlet is sparse, so that the materials pre-dried in the stepped incinerator can be conveniently driven; the rotary incinerator is rotated to drive the materials to move, the materials are precombusted in the moving process, the materials are gradually dispersed and crushed in the moving process towards the direction of the discharge hole, scraping teeth in the rotary incinerator are arranged to be dense gradually, the small materials are conveniently driven to move towards the discharge hole, meanwhile, the heating area of the small materials can be increased, the materials are prevented from being accumulated, the heating is uneven, and the burnout rate is poor.

Compared with the prior art, the utility model has the beneficial effects that:

1. the device is combined, the combined advantages can be fully utilized, the physical and chemical characteristics of solid waste alternative fuels are combined, a set of device for preheating and pre-burning the solid waste and dangerous waste alternative fuels is additionally arranged in front of a kiln tail decomposing furnace, the step incinerator is arranged to preheat and dry the solid waste alternative fuels, and then the solid waste and dangerous waste alternative fuels enter the rotary incinerator to be pre-burnt, so that the calcination decomposition time outside a kiln of the solid waste and dangerous waste is prolonged, the moisture in the solid waste and dangerous waste is reduced, the influence on a kiln calcination system is reduced, the device can be used for treating the garbage with small particle size and also can be used for treating massive solid waste, the application range is wider, the influence of the solid waste on the calcination system is reduced, the disposal capacity of the solid waste is improved, and the recycling, harmless and reduction disposal of the solid waste are realized.

2. Through set up a plurality of air cannons on each step of ladder incinerator, can effectively stir the rubbish fuel, make it fully burn to because the promotion of air cannon can not form the slag adhesion, the air excess factor is high, uses safe and reliable, and does not have relative motion mechanism, the wearing and tearing is little, maintains simply.

3. The step incinerator can also control the stay time of the garbage fuel in the hearth by controlling the spraying frequency of the air cannon, the rotary incinerator can also regulate and control the combustion time of the solid waste garbage in the rotary incinerator by adjusting the rotation speed, the stay time of the solid waste garbage in the incinerator can be independently controlled in the front stage and the rear stage, the burnout efficiency is improved, and the accurate regulation and control of the stay time of the solid waste garbage in the precombustion device can flexibly regulate and control when facing the solid waste garbage with different diameters and forms, so that the operation is convenient.

4. Two raw material discharging openings are arranged for regulating and controlling the temperature in the stepped incinerator, the temperature can be greatly increased when solid wastes are preheated and dried, and the excessive temperature can generate waste gas and damage the incinerator body; when the temperature is too high, raw materials can be respectively put into the furnace through the two raw material discharging openings according to the heating position as required, and the temperature in the furnace is neutralized, so that the effect of cooling and protecting the furnace body is achieved.

5. Scraping teeth arranged in the rotary incinerator are changed from dredging from a feeding hole to a discharging hole, so that large-block materials are convenient to decompose, and

conveying small materials; when the bulk material enters, the scraping teeth at the feed inlet are sparse, so that the bulk material is conveniently driven to burn in the rotary incinerator along with the rotation of the rotary incinerator, the bulk material burns gradually, breaks and becomes smaller, the scraping teeth in the rotary incinerator become more dense gradually, the material is driven to move towards the discharge outlet of the rotary incinerator, and the material is prevented from being deposited in the furnace and heated unevenly.

Drawings

FIG. 1 is a schematic diagram of a decomposing furnace pre-combustion device for a cement kiln;

FIG. 2 is a schematic view of the structure of the rotary incinerator according to the present utility model;

FIG. 3 is a schematic view of different scraping tooth structures in the rotary incinerator of the present utility model;

FIG. 4 is a process flow diagram of example 1 of the present utility model;

1-step incinerator, 11-spiral feeding device, 12-tertiary air inlet, 13-raw material feed opening, 14-step, 15-air blowing system, 16-sliding chute, 2-rotary incinerator, 21-scraping tooth, 22-rotary driving mechanism, 23-cylinder supporting device, 3-decomposing furnace and 4-solid waste alternative fuel inlet.

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.

It should be noted that, without conflict, the embodiments of the present utility model and the features of the embodiments may be combined with each other

Example 1

As shown in fig. 1, the decomposing furnace pre-combustion device for the cement kiln comprises a step incinerator 1 and a rotary incinerator 2, wherein the front end of the step incinerator 1 is in a step shape, a tertiary air inlet 12 is formed in the top of the front end, a feeding hole of the step incinerator 1 is connected with a solid waste alternative fuel inlet 4, and a discharging hole at the rear end of the step incinerator 1 is connected with a feeding hole of the rotary incinerator 2; the rear end of the rotary incinerator 2 is communicated with a kiln tail decomposing furnace 3; the whole inclination direction of the pre-combustion device is arranged from high to low as follows: from the tertiary air inlet 12 on the step incinerator 1 to the rotary incinerator 2 and then to the kiln tail decomposing furnace 3.

The conventional pre-combustion device is generally provided with only one step incinerator 1 or rotary incinerator 2, solid waste dangerous waste is sent into the step incinerator 1 or the rotary incinerator 2 through a feed inlet, combustion is carried out in the step incinerator 1 or the rotary incinerator 2, and then the burnt materials are sent into the decomposing furnace 3, so that the purpose is to prolong the pre-combustion time of the solid waste dangerous waste outside the decomposing furnace 3 by utilizing the pre-combustion device, and main combustion work is still concentrated in the decomposing furnace 3. However, such a setting is small in the combustion effect achieved by the step-type incinerator 1 or the rotary incinerator 3 alone, and since only one step-type incinerator 1 or rotary incinerator 3 is provided, when large-sized waste is handled, it takes a longer time, wastes more energy, and it is difficult to predict whether the desired effect can be satisfied, and the operating pressure of the decomposing furnace 3 is increased intangibly.

As shown in fig. 4, by using the decomposing furnace pre-combustion device for the cement kiln, solid waste and dangerous waste are fed in from a solid waste alternative fuel inlet 4 and fed into the step incinerator 1 through a spiral feeding device 11, and the solid waste alternative fuel fed in from the rotary feeding device 11 naturally falls on a step 14 arranged in the step incinerator 1 because the whole of the decomposing furnace pre-combustion device is at a certain angle with the horizontal plane, and the step 14 is arranged from the feed inlet to the discharge outlet from high to low.

After the solid waste alternative fuel enters the step incinerator 1, the prepared air blowing system 15 is utilized to push the materials on the steps 14 to move towards the next step 14, and the blowing frequency of the air cannon is adjusted, so that the materials are stirred in the step incinerator 1, the effect of full preheating is achieved, the solid waste alternative fuel is prevented from accumulating in the step incinerator 1, and the massive solid waste alternative fuel can be fully preheated and dried; when the solid waste alternative fuel is a substance with better treatment or smaller particle size, the injection frequency of the air cannon can be accelerated, the solid waste alternative fuel can be accelerated to enter the next stage, and the newly-entering solid waste alternative fuel can be preheated and dried in the step incinerator 1, so that the production efficiency is improved.

In the process of preheating and drying the solid waste alternative fuel in the step incinerator 1, the temperature of the step incinerator 1 is increased, a large amount of waste gas is generated due to the temperature increase, and at the moment, the raw material can be put into the raw material through the two raw material discharging openings 13 to neutralize the temperature; the raw material discharging openings 13 are arranged above the part, provided with the step 14, of the front half section of the stepped incinerator 1, and are arranged above the part, provided with the step 14, of the rear half section of the stepped incinerator 1, when the temperature in the stepped incinerator 1 rises, different raw material discharging openings 13 can be selected according to the temperature rising position, raw materials are put into the stepped incinerator, the temperature of the raw materials is utilized to neutralize the temperature in the incinerator 1, meanwhile, the stepped incinerator 1 can be protected, and the service life of the stepped incinerator 1 is prolonged.

The solid waste substituted fuel after preheating and drying in the step incinerator 1 is sent into the rotary incinerator 2 along the sliding chute 11 for pre-incineration; the rotary driving mechanism 22 is arranged in the cylinder supporting device 23, the rotary driving device 22 is opened, the cylinder supporting device 23 starts to rotate clockwise to drive the rotary incinerator 2 to rotate anticlockwise, and the solid waste alternative fuel entering the rotary incinerator 2 is driven to the direction of a discharge hole of the solid incinerator 2.

The scraping teeth 21 arranged on the inner side of the feed inlet of the rotary incinerator 2 are larger in distance, so that solid waste alternative fuel with larger particle size can be conveniently grasped, the solid waste alternative fuel can be driven to move in the rotary incinerator 2, and the phenomenon that massive solid waste alternative fuel directly slides to the bottom of the rotary incinerator due to larger self weight and cannot be fully combusted is prevented; in the rotary incinerator 2, the solid waste alternative fuel is pre-combusted, small solid waste alternative fuel can be completely combusted in the rotary incinerator 2, and large solid waste alternative fuel can be further decomposed and crushed; along with the movement of the solid waste alternative fuel to the discharge port direction of the rotary incinerator 2, the scraping teeth 21 in the rotary incinerator 2 are gradually changed gradually and densely, so that decomposed small materials can be conveniently grasped, the decomposed small materials are fully combusted in the rotary incinerator 2 and then further decomposed and crushed, and meanwhile, the solid waste alternative fuel can be prevented from colliding with the inner wall of the rotary incinerator 2 and damaging the rotary incinerator 2 in the overturning process of the rotary incinerator 2.

When the solid waste alternative fuel in the rotary incinerator 2 moves to the bottom of the rotary incinerator 2, the preheating and pre-incinerating time is prolonged, the working time of each part is controlled, and compared with the material at the moment, whether the particle size, the humidity and the like are changed greatly at the beginning, the material is more favorable for the heating and decomposition of the decomposing furnace 3, and the decomposing furnace 3 is a main heating place, but the preparation of the pre-burning step is quite sufficient, so that the combustion speed in the decomposing furnace 3 can be effectively accelerated, the working pressure of the decomposing furnace 3 is reduced, and the working efficiency is improved.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. The utility model provides a cement kiln is with decomposition stove precombustion device, precombustion device front end is connected solid useless alternative fuel entry (4), precombustion device rear end is connected with decomposition stove (3), its characterized in that: comprises a step incinerator (1) and a rotary incinerator (2); the bottom of the front end of the step incinerator (1) is stepped, a tertiary air inlet (12) is formed in the top of the front end of the step incinerator (1), and a discharge hole at the rear end of the step incinerator (1) is connected with a feed inlet of the rotary incinerator (2); the rear end of the rotary incinerator (2) is communicated with the decomposing furnace (3); the whole inclined direction of the pre-combustion device is from a tertiary air inlet (12) at the top of the step incinerator (1) to a feed inlet of the rotary incinerator (2), and then from high to low to the tail of the rotary incinerator (2), and the pre-combustion device is sequentially arranged.

2. A decomposing furnace pre-combustion device for a cement kiln as claimed in claim 1, characterized in that: the step incinerator (1) is inclined at a certain angle from a feed inlet to a discharge outlet, the tertiary air inlet (12) is the highest point of the step incinerator (1), and the joint of the discharge outlet of the step incinerator (1) and the feed inlet of the rotary incinerator (2) is the lowest point of the step incinerator (1).

3. A decomposing furnace pre-combustion device for a cement kiln as claimed in claim 2, characterized in that: a spiral feeding device (11) is arranged between the feeding hole of the step incinerator (1) and the solid waste alternative fuel inlet (4), and the spiral feeding device (11) is close to one side of the feeding hole of the step incinerator (1).

4. A decomposing furnace pre-combustion device for a cement kiln as claimed in claim 2, characterized in that: the inner bottom of the step incinerator (1) is provided with a plurality of steps (14) from front to back and from top to bottom, the step incinerator is provided with an air blowing system (15), and a plurality of air cannons are arranged on the steps (14) to form the air blowing system (15).

5. The decomposing furnace pre-combustion device for a cement kiln as defined in claim 4, wherein: in the step incinerator (1), the fall between the steps (14) is 200-800mm, and the number of the steps (14) is 5-20 steps; the air blowing system (15) is provided with 3-5 air cannons on each step.

6. A decomposing furnace pre-combustion device for a cement kiln as claimed in claim 2, characterized in that: two raw material discharging openings (13) are arranged behind the tertiary air inlet (12) at the top of the step incinerator (1); two raw material feed openings (13), one is arranged above the part, provided with the step (14), of the front end bottom of the step incinerator (1), and the other raw material feed opening (13) is arranged above the part, close to the part, provided with the step (14), of the discharge opening of the step incinerator (1).

7. A decomposing furnace pre-combustion device for a cement kiln as claimed in claim 1, characterized in that: the step incinerator (1) discharge port is connected with the rotary incinerator (2) feed port, and a sliding chute (16) is arranged on the side surface inside the step incinerator (1) discharge port and inside the rotary incinerator (2) feed port.

8. A decomposing furnace pre-combustion device for a cement kiln as claimed in claim 1, characterized in that: the bottom of the rotary incinerator (2) is provided with a cylinder supporting device (23).

9. A decomposing furnace pre-combustion device for a cement kiln as set forth in claim 8, wherein: a rotary driving mechanism (22) is arranged in the cylinder supporting device (23).

10. A decomposing furnace pre-combustion device for a cement kiln as set forth in claim 8, wherein: scraping teeth (21) with different densities are arranged in the rotary incinerator (2), and the scraping teeth (21) are arranged from a feed inlet to a discharge outlet and are densely distributed.