CN218544459U - Be used for cement kiln to deal with spiral staircase stove in coordination - Google Patents

Abstract

The utility model discloses a be used for cement kiln to deal with rotary furnace in coordination, including rotatory center post (1), around rotatory center post (1) spiral arrangement's multistage rotatory hearth (2), set up feed inlet (3) on rotatory hearth (2) top, set up at collection ash chute (4) of rotatory hearth (2) low side and set up the compressed air big gun on rotatory hearth (2) of each grade. The invention has the unique advantages of relative simplicity, small occupied area, less investment, stable and reliable operation, lower operation cost, strong solid waste adaptability, high burnout rate and the like. The high-temperature environment of the cement rotary kiln system is utilized, secondary pollution is avoided, and meanwhile, heat in the household garbage can replace part of coal to be used. Through high-temperature incineration and mineralized high-temperature sintering of cement clinker, biomass, solid waste, household garbage and the like are used for replacing part of cement production fuels, and recycling and harmless treatment are realized.

Description

Be used for cement kiln to deal with spiral staircase stove in coordination

Technical Field

The utility model relates to a belong to cement kiln and deal with the field in coordination, especially a be used for cement kiln to deal with rotary furnace in coordination.

Background

When solid waste and household garbage are incinerated and disposed by utilizing an industrial kiln, in order to solve the problem that heterogeneous solid waste cannot be stably combusted, the heat value of materials entering a furnace is generally subjected to restrictive requirements, and targeted equipment structure development is carried out on areas which are dry, fired, combusted and burnt out so as to ensure the incineration disposal effect. At present, the solid waste incineration disposal devices commonly used in the cement industry mainly have the following types:

1) The technology of the hot plate furnace and the decomposing furnace comprises the following steps: and the solid waste is sent into a hot plate furnace for incineration disposal after simple dehydration and coarse crushing. The bottom of the hot plate furnace is provided with a rotary furnace plate, and the interior of the hot plate furnace is provided with refractory materials. The hot plate furnace and the decomposing furnace are integrated, the decomposing furnace is implanted in a cone part, part or all of tertiary air of the cement kiln system enters the decomposing furnace after rotating for about 270 degrees through the hot plate furnace, solid waste and preheated raw materials enter the hot plate furnace through different channels and are mixed with the tertiary air to be combusted on the surface of the furnace plate, and unburned materials and ash residues are scraped into the decomposing furnace through a scraper at the joint of the hot plate furnace and the decomposing furnace to be further combusted.

2) The technology of the step furnace and the decomposing furnace: and after the solid waste is simply dehydrated and coarsely crushed, sending the solid waste into a hot plate furnace for incineration disposal. The method comprises the steps of modifying a furnace entering tertiary air area, implanting a stepped furnace with an inclination angle of 12-15 degrees at the bottom of a decomposing furnace, enabling part or all of tertiary air of a furnace body to pass through the stepped furnace, feeding solid waste into the stepped furnace through sealed feeding, utilizing a hydraulic device or a compressed air injection device at the bottom of the stepped furnace to slide on the stepped furnace and enable part of the tertiary air to roll and move slowly, controlling the combustion temperature of the solid waste in the stepped furnace through the action of the tertiary air and partial hot raw materials, and enabling unburned materials and ash residues to fall into a cement kiln system at the tail end of the stepped furnace to be burned.

3) Grate furnace and decomposing furnace technology: and (4) after the solid waste is simply dehydrated, sending the solid waste into a grate furnace for incineration disposal. The solid waste is pushed by a moving grate on an inclined grate, is dried, heated and ignited to burn slowly by primary air which is blown upwards from the bottom and preheated to 200-250 ℃, the combustion temperature of the grate is adjusted by controlling the proportion of combustion-supporting air, and flue gas generated by burning is sent into a decomposing furnace through a thermal pipeline to be disposed. The slag is sent to a raw material mill to replace part of raw materials after being quenched and cooled by water.

However, the above prior art has the following obvious drawbacks:

1) The technology of the hot plate furnace and the decomposing furnace comprises the following steps: the hot plate furnace is implanted into the conical part of the decomposing furnace, so that the effective volume and the stable control of the flow field of the decomposing furnace are adversely affected, the balance of the original sintering system is damaged to a certain extent, and the control requirement is improved. The higher-moisture solid waste can be combusted on the surface of the furnace tray only in a fixed bed mode in the hot tray furnace, and the burnout rate of the materials entering the furnace by the scraper is low. When the garbage heat value, the moisture and the ash content fluctuate greatly, the working condition of the hot plate furnace is not easy to control, and the coal consumption and the power consumption of a firing system are increased.

2) The technology of the step furnace and the decomposing furnace: the residence time of the material is strictly dependent on the movement frequency of the grate at the bottom or the purging frequency of the compressed air. The solid waste material can be ignited and combusted on the surface of the stepped furnace in limited contact with the tertiary air, segregation phenomenon can occur along with the combustion, and the control requirement of the system is relatively high.

3) Grate furnace and decomposing furnace technology: the technology adopts cold air as combustion-supporting air, water quenching slag discharging, heat radiation of a thermal pipeline introduced into the decomposing furnace and the like, so that the heat utilization efficiency of the system is reduced. The solid waste is dried on the surface of the grate furnace, the combustion of the primary air and flame is required to release heat together, the combustion of the solid waste is only carried out in a limited shallow space, and the burning-out can be realized only by depending on longer retention time.

Disclosure of Invention

The utility model discloses an aim at solves above-mentioned tradition systematically and solves solid useless problem of burning in coordination processing in-process existence, burns the decomposing furnace bottom of system at present large-scale cement clinker and burns, implants a rotary ladder formula and burns the device, inserts the tertiary air of cement production, and through realizing that high temperature tertiary air is opposite with the solid useless rubbish flow direction of feeding, form the mode against the current, solid useless rubbish rapid draing of feeding, catch fire, realize stable burning.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a be used for cement kiln to deal with spiral terraced stove in coordination, includes rotatory center post, around the multistage rotary hearth that rotatory center post spiral set up, set up the feed inlet on rotary hearth top, set up the ash collecting chute in rotary hearth low side and set up the compressed air cannon on each level rotary hearth.

The rotary central column is a secondary combustion pipe with a hollow structure, the top end of the rotary central column is communicated with the upper end of the cement kiln decomposing furnace, and the bottom end of the rotary central column is communicated with the ash return pipe.

The rotary hearth is of a stepped pipeline structure and comprises two pipe orifices, namely a hot air inlet at the top end and a hot air interface at the bottom end; the rotary hearth is communicated with the upper end of the cement kiln decomposing furnace through a hot air inlet, and the rotary hearth is connected with high-temperature tertiary air through a hot air interface.

The ash collecting chute is of a closed pipeline structure, the top end of the ash collecting chute is communicated with the bottom end of the rotary hearth at the last stage, and the lower end of the ash collecting chute is communicated with the ash return pipe.

The utility model provides a be used for cement kiln to deal with rotary furnace in coordination, still includes back ash pipe, back ash pipe top respectively with rotatory center post the collection ash chute is linked together, and the bottom is linked together with the cellar for storing things tail smoke chamber of cement kiln dore furnace.

The compressed air cannon comprises a compressed air nozzle and a compressed air interface, and the compressed air nozzle is arranged on each stage of rotary hearth step; and the compressed air interface is arranged on the outer pipe wall of each stage of rotary hearth and is connected with the compressed air pump.

The utility model provides a be used for cement kiln to deal with rotary furnace in coordination, still includes temperature-detecting device, and temperature-detecting device sets up rotatory hearth top for temperature and accident in the control rotary furnace put out a fire, prevent that too high temperature from causing the interior coking of stove.

Compare in current coprocessing technique in coordination, the utility model discloses the creation has following advantage:

1) The concurrent flow incinerator type of hot plate furnace, stepped furnace, grate furnace, etc. has material contacting with 900-1000 deg.c high temperature tertiary air, and the countercurrent rotary ladder type incinerator has material contacting with over 1100 deg.c high temperature airflow, initial material stoving strength, igniting speed, burning speed, etc. obvious advantages.

2) Compared with concurrent flow furnace types such as a hot plate furnace, a step furnace, a grate furnace and the like, the temperature distribution in the spiral ladder furnace is more gentle and reasonable, and a high-temperature area above 1200 ℃ is not easy to appear.

3) The rotary ladder countercurrent incinerator has better control on the material combustion time than concurrent furnaces such as a hot plate furnace, a ladder furnace, a grate furnace and the like. In the turning and blowing process of the materials from top to bottom, loose and surface materials are easily carried by high-temperature airflow from top to bottom to flow back, the combustion time of the materials in the furnace is further prolonged, and the countercurrent mode is also favorable for turning and distributing the materials.

4) Utilize the spiral ladder center post structure, set up the postcombustion pipe for partial tiny particle material can the postcombustion, further improves the burnout rate of material in the stove, reduces the influence to decomposing furnace, smoke chamber. Meanwhile, the design of the secondary combustion pipe is also beneficial to staged combustion control and reduction of emission of nitrogen oxides.

5) The implantation of the rotary furnace does not invade and occupy, does not damage the structure of the original decomposing furnace, air pipe parameters and the like, furthest reduces the damage to the technological design parameters of a cement kiln firing system, and is beneficial to the stability of the thermal regulation and production control of the cement kiln.

6) The rotary ladder furnace has the advantages of relatively simple structure, small occupied area, less investment, stable and reliable operation and lower operation cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is an installation schematic diagram of the present invention;

FIG. 3 is a schematic view of the installation of the compressed air cannon of the present invention;

in the drawings: 1-rotating central column, 2-rotating hearth, 3-feeding port, 4-ash collecting chute, 5-compressed air nozzle, 6-hot air inlet port, 7-hot air interface, 8-ash returning pipe, 9-compressed air interface, 10-kiln tail smoke chamber, 11-cement kiln decomposing furnace and 12-raw material feeding port.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

As shown in fig. 1 and 2, the rotary ladder furnace for the cooperative disposal of the cement kiln comprises a rotary central column 1, a plurality of stages of rotary hearths 2 spirally arranged around the rotary central column 1, a feeding port 3 arranged at the top end of each rotary hearth 2, an ash collecting chute 4 arranged at the lower end of each rotary hearth 2 and a compressed air cannon arranged on each stage of rotary hearth 2.

The rotary central column 1 is a hollow secondary combustion pipe, the top end of the rotary central column 1 is communicated with the upper end of the cement kiln decomposing furnace, and the bottom end of the rotary central column 1 is communicated with an ash return pipe 8.

The rotary hearth 2 is of a stepped pipeline structure and comprises two pipe orifices, namely a hot air inlet 6 positioned at the top end and a hot air interface 7 positioned at the bottom end; the rotary hearth 2 is communicated with the upper end of a cement kiln decomposing furnace 11 through a hot air inlet 6, and the rotary hearth 2 is connected with high-temperature tertiary air through a hot air connector 7.

The ash collecting chute 4 is of a closed pipeline structure, the top end of the ash collecting chute 4 is communicated with the bottom end of the rotary hearth 2 at the last stage, and the lower end of the ash collecting chute 4 is communicated with the ash return pipe 8.

The utility model provides a be used for cement kiln to deal with spiral elevator stove in coordination, still includes ash return pipe 8, ash return pipe 8 top respectively with rotatory center post 1 ash collection chute 4 is linked together, and the bottom is linked together with the kiln tail smoke chamber 10 of cement kiln dore furnace 11.

As shown in fig. 3, the compressed air cannon comprises a compressed air nozzle 5 and a compressed air interface 9, wherein the compressed air nozzle 5 is arranged on each step of the rotary hearth 2; and a compressed air interface 9 is arranged on the outer pipe wall of each stage of rotary hearth 2 and is connected with a compressed air pump.

A is used for the cement kiln to deal with the rotary furnace cooperatively, also include the temperature detection device and set up in the top of the rotary hearth 2 and raw meal feed inlet 12 adjacent to feed inlet 3, adjust the raw meal feed amount entering the rotary furnace through the raw meal feed inlet 12 of single-point or multipoint, is used for controlling the temperature in the rotary furnace and accident to put out a fire; the temperature detection device is arranged at the top of the rotary hearth 2 and used for monitoring the temperature in the rotary furnace and preventing the coking in the rotary furnace caused by overhigh temperature.

The rotary ladder furnace is implanted at the furnace entering section of the tertiary air pipe, biomass, solid waste and household garbage enter from a feeding port 3 at the upper part of the rotary ladder furnace, high-temperature tertiary air enters from a hot air port 7 at the lower part of the rotary ladder furnace, and air and material flow directions form a counter-flow mode.

1) Materials with smaller granularity and low moisture can be quickly dried and fired in a short time and directly enter the cement kiln decomposing furnace 11 along with tertiary air; and the material with larger granularity and higher moisture is burnt by falling into the first-stage hearth of the rotary ladder furnace, and is regularly sprayed and blown by the compressed air nozzles arranged on the steps and the side wall, the incompletely burnt material is continuously turned and blown to the second-stage hearth for burning, and the like until the material enters the last-stage hearth of the rotary ladder furnace.

2) High-temperature tertiary air enters from the last stage of hearth, particles which are incompletely combusted and have smaller particle sizes can be carried by high-temperature air flow at 900-1000 ℃ to be continuously dried and combusted in the rotary furnace, the high-temperature air flow gradually rises in the rotary furnace, along with the turning, drying and burning of biomass, solid waste and domestic garbage in each stage of hearth, the air flow temperature gradually rises to over 1100 ℃, the high-temperature air flow rises to the tail end of the rotary furnace, which enters the furnace, and meets the materials which just enter the rotary furnace, the materials which have smaller particle sizes and lower water contents can be quickly dried and fired in a short time, and the high-temperature air flow enters the first pot body of the decomposing furnace.

3) The material which is not completely combusted in the last stage of hearth enters an ash collecting chute, is regularly blown by a compressed air nozzle to be vibrated and loosened and then enters an ash returning pipe, large-particle material falls into the ash returning pipe to enter a kiln tail smoke chamber, fine material enters a central air duct along with wind to be secondarily combusted, and enters a second pot body of the decomposing furnace along with high-temperature air flow.

4) The feeding ports of the biomass, solid waste and household garbage are connected with hot raw materials, and the hot raw materials are combined with a temperature detection device arranged at the top of a hearth for controlling the temperature in the rotary ladder furnace and extinguishing fire by accident, so that coking in the furnace is prevented from being caused by overhigh temperature.

In the present embodiment, the first and second electrodes are,

1) According to the tertiary air pipe and the convenience of butt joint, the rotary furnace can be arranged in a pre-heater tower and on the side surface of the decomposing furnace. The design of the specification of the rotary ladder furnace hearth is carried out according to the cooperative treatment capacity, and the section wind speed of the furnace hearth and the furnace inlet is designed to be 20-30 m/s.

2) According to different furnace types, the tertiary air interface of the rotary elevator furnace can be branched with the tertiary air pipe on one side or directly butted with the main pipeline, and the hot air furnace inlet is connected with the first pot body of the decomposing furnace. The air quantity entering the rotary ladder furnace and the original tertiary air pipe can be controlled by a tertiary valve on the pipeline. The air quantity passing through the rotary elevator furnace accounts for 60-80% of the tertiary air.

3) The spiral ladder structure can be flexibly designed in 0.5-2 circles according to the equipment arrangement and design requirements, and can be composed of 4-12 stages of hearths, each stage of hearth is provided with an air box on steps, and a plurality of compressed air nozzles are designed on the vertical surface and the side surface and used for turning, vibrating and blowing materials.

4) The upper part of the central column of the spiral ladder is connected with a secondary combustion pipe to be connected into the decomposing furnace, the lower part of the central column of the spiral ladder is provided with an ash collecting chute and an ash returning pipe, and the ash collecting chute is provided with a plurality of compressed air nozzles for vibrating and dispersing and dredging the hard-burning large materials.

5) The biomass, solid waste, household garbage and other materials are fed into the rotary ladder furnace from the feeding port, and a hot raw material port is reserved and enters the rotary ladder furnace from the feeding port.

6) The step hearth in the rotary ladder furnace uses a 200-300 mm thick anti-caking Pi Weijing plate material, so that the risk of skinning and coking is reduced; other heating surfaces are provided with heat insulation layers with the thickness of 200-300 mm, and the materials of the heat insulation layers are nano heat insulation materials and high-temperature high-strength casting materials, so that the long-term stable operation of the equipment is ensured.

The utility model discloses the cubic wind that inserts cement production, through the solid useless rubbish flow direction opposite who realizes high temperature cubic wind and feeding, form the mode against the current, to the solid useless rubbish rapid draing of feeding, catch fire, realize the stable combustion, the waste gas that wherein produces gets into and continues burning decomposition in the decomposition furnace, the lime-ash entering rotary kiln tail smoke-box of production lasts to calcine the solidification. Compared with the existing various solid waste disposal devices (such as a hot plate furnace, a step furnace, a grate furnace and the like), the rotary furnace has the unique advantages of relatively simple system, small occupied area, less investment, stable and reliable operation, lower operation cost, strong solid waste adaptability, high burnout rate and the like. The high-temperature environment of the cement rotary kiln system is utilized, secondary pollution is avoided, and meanwhile, heat in the household garbage can replace part of coal to be used. Through high-temperature incineration and mineralized high-temperature sintering of cement clinker, biomass, solid waste, household garbage and the like are used for replacing part of cement production fuel, recycling and harmless treatment are realized, the improvement of local natural environment is facilitated, and good social benefit, environmental benefit and economic benefit are achieved.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides a be used for cement kiln to deal with spiral terraced stove in coordination which characterized in that, including rotatory center post (1), around rotatory center post (1) spiral set's multistage rotatory hearth (2), set up feed inlet (3) on rotatory hearth (2) top, set up in the ash collection chute (4) of rotatory hearth (2) low side and set up the compressed air cannon on rotatory hearth (2) of each grade.

2. The cement kiln co-disposal spiral ladder furnace as claimed in claim 1, wherein the rotating central column (1) is a hollow secondary combustion pipe, the top end of the rotating central column (1) is communicated with the upper end of the cement kiln decomposing furnace (11), and the bottom end of the rotating central column (1) is communicated with the ash returning pipe (8).

3. The cement kiln co-treatment rotary ladder furnace as claimed in claim 1, wherein the rotary hearth (2) is a ladder pipe structure comprising two pipe openings, namely a hot air inlet (6) at the top end and a hot air port (7) at the bottom end; the rotary hearth (2) is communicated with the upper end of a cement kiln decomposing furnace (11) through a hot air inlet (6), and the rotary hearth (2) is connected with high-temperature tertiary air through a hot air connector (7).

4. The cement kiln co-disposal rotary ladder furnace as claimed in claim 1, wherein the ash collection chute (4) is of a closed pipeline structure, the top end of the ash collection chute (4) is communicated with the bottom end of the rotary hearth (2) at the last stage, and the lower end of the ash collection chute (4) is communicated with the ash return pipe (8).

5. The cement kiln co-disposal rotary ladder furnace as claimed in claim 1, further comprising an ash return pipe (8), wherein the top end of the ash return pipe (8) is respectively communicated with the rotary central column (1) and the ash collection chute (4), and the bottom end is communicated with a kiln tail smoke chamber (10) of the cement kiln decomposing furnace (11).

6. The cement kiln disposing together shaft furnace as claimed in claim 1, wherein the compressed air cannon comprises a compressed air nozzle (5) and a compressed air interface (9), the compressed air nozzle (5) is disposed on each step of the rotary hearth (2); and a compressed air interface (9) is arranged on the outer pipe wall of each stage of rotary hearth (2) and is connected with a compressed air pump.

7. The cement kiln disposing together spiral elevator furnace as claimed in claim 1, further comprising a temperature detecting means disposed on top of said rotary hearth (2) and a single-point or multi-point raw material feeding port (12) disposed at the top of the rotary hearth (2) adjacent to the feeding port (3).

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