CN115751990A - Rotary kiln heat energy circulating system and application thereof - Google Patents
Rotary kiln heat energy circulating system and application thereof Download PDFInfo
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Abstract
The invention discloses a rotary kiln heat energy circulating system and application thereof, and the rotary kiln heat energy circulating system comprises a roasting unit and a preheating unit, wherein one end of the preheating unit is connected with a feeding unit and a flue gas collecting unit, one end of the roasting unit is connected with a discharging unit and an ignition unit, one end of the flue gas collecting unit is connected with a tail gas processing unit, an internal communication structure is arranged between the roasting unit and the preheating unit, the discharging unit is connected with a waste heat recovery unit, one end of the waste heat recovery unit is connected with a cooling unit, the waste heat recovery unit is connected with the preheating unit, the other end of the waste heat recovery unit is connected with the ignition unit, the roasting unit is provided with a first wind power adjusting mechanism, the internal communication structure comprises a heat-insulating shell, one end of the preheating unit is rotatably arranged in the heat-insulating shell, one end of the roasting unit is rotatably arranged in the heat-insulating shell, and one ends, extending into the heat-insulating shell, of the preheating unit and the roasting unit are respectively provided with a first check ring. Solves the problems of low heat energy utilization rate and poor calcining quality of the existing ceramsite rotary kiln.
Description
Technical Field
The invention relates to the technical field of shale ceramsite calcination, in particular to a rotary kiln heat energy circulating system and application thereof.
Background
The ceramsite is an electrodeless light aggregate, has the characteristics of small density, porous interior, uniform shape and components, high strength, firmness and the like, and is widely applied to the fields of building materials, filter materials and refractory heat-insulating materials. The shale ceramsite is prepared by taking natural rock shale as a raw material and carrying out crushing, screening, preheating and roasting on the natural rock shale. The ceramsite is nontoxic, tasteless, compression-resistant, wear-resistant, corrosion-resistant, good in adsorption performance and strength, and wide in application range at present. Firstly, shale raw ore is crushed by a jaw crusher, sieved after being crushed, particles with the particle size of 3mm-5mm are selected as raw materials, then the raw materials are sent into an electric furnace for preheating, immediately sent into a resistance furnace at a target temperature for roasting after preheating is finished, and cooled at room temperature after roasting is finished to obtain ceramsite. The existing preheating and roasting processing modes are mainly divided into two modes, one mode is that one end of the whole rotary kiln is used for preheating, and the other end of the whole rotary kiln is used for roasting, so that heat energy flows in the rotary kiln, and the other mode is that the preheating and roasting rotary kiln is divided into two devices, the preheated raw materials are conveyed to a rotary kiln for roasting, and in order to increase the contact area, stirring equipment is usually arranged in the rotary kiln, so that local high temperature can be prevented, and the heating is uniform.
Chinese patent application publication No. CN107382279A discloses a ceramsite combustion process, which adopts an integrated rotary kiln for preheating and roasting.
The Chinese patent with the publication number of CN217131790U discloses a stepped rotary kiln applied to gangue ceramsite, and a multi-stage kiln with a stepped structure is formed by combining kiln body parts, so that the retention time of material particles in the kiln is prolonged, the material particles are better preheated, the material particles are more fully calcined in a roasting interval, the filling rate in the kiln is higher, and the yield is higher.
In order to ensure the utilization rate of heat energy, a plurality of patents study the recycling of heat sources:
chinese patent No. CN110094968B discloses a thermal ceramsite waste heat recovery kiln, which utilizes calcined ceramsite waste heat as a heat source to recover heat, and discloses a new heat recovery concept.
Chinese patent application No. CN109579555A discloses a device and method for recovering kiln waste heat by using circulating air, which is also used for recovering heat energy in a cooling process.
In view of the problems existing in the existing ceramsite processing process: the preheating temperature and the preheating time are controlled, and the temperature in the preheating stage is controlled between 400 ℃ and 600 ℃. In the preheating stage, the sudden change of the temperature can cause the explosion of raw materials, so that various properties of the finally fired ceramsite are reduced; meanwhile, the gas quantity generated by the raw meal in the roasting stage needs to be controlled, organic matters and carbonate in the raw meal begin to decompose and volatilize to generate gas in the preheating stage of the raw meal, and the gas quantity generated by the raw meal in the roasting stage is reduced after preheating. The two factors of the preheating temperature and the preheating time can influence the quality of the final ceramsite, if the preheating temperature is too high or the preheating time is too long, a large amount of gas can be generated in the raw meal in the preheating stage, and the expansion of the ceramsite is poor due to insufficient expansion gas in the roasting stage of the raw meal; however, insufficient preheating results in cracking of the raw meal during high-temperature firing, all of which affect the final properties of the ceramsite.
In the prior art, although relevant research is carried out on heat energy collection, no relevant research is carried out on overall energy distribution and internal heat circulation management in the ceramsite calcination process.
Disclosure of Invention
The invention aims to provide a preheating system for recycling heat energy of a rotary kiln, which is used for solving the problems of low heat energy utilization rate and poor calcination quality of the conventional ceramsite rotary kiln.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a rotary kiln heat energy circulation system, includes calcination unit and preheats the unit, it is connected with feeding unit and flue gas collection unit to preheat unit one end, calcination unit one end is connected with ejection of compact unit and ignition unit, flue gas collection unit one end is connected with the tail gas processing unit, it is provided with interior UNICOM structure to roast unit and preheat between the unit, ejection of compact unit is connected with waste heat recovery unit, waste heat recovery unit one end is connected with the cooling unit, waste heat recovery unit links to each other with preheating the unit, and the other end links to each other with the ignition unit, the calcination unit is provided with first wind-force adjustment mechanism, interior UNICOM structure includes the heat preservation shell, it rotates to set up in the heat preservation shell to preheat unit one end, calcination unit one end is rotated and is set up in the heat preservation shell, it all is provided with first retaining ring to preheat unit and the one end that calcination unit stretches into the heat preservation shell, be provided with the second retaining ring in the heat preservation shell, first retaining ring and second retaining ring constitute broach cross structure, it is integrative to preheat unit and calcination unit to link to form the linkage segment, be provided with the venthole on the heat preservation shell, it links to set up the wind-through-hole to link to be provided with the wind-force adjustment mechanism outside the linkage through-hole, the linkage through-up the second retaining cover, the calcination unit is connected with the calcination unit, the calcination unit. The first wind power adjusting mechanism mainly cooperates with the ignition unit, and can pump external combustion-supporting air and can also pump high-temperature air in the circulation.
Preferably, a third wind power adjusting mechanism is arranged in the flue gas collecting unit. The third wind power adjusting mechanism is used for selectively conducting the preheating unit, the waste heat recovery unit, the roasting unit and the tail gas treatment unit.
Preferably, the flue gas collecting unit is connected with the ignition unit through a second wind power adjusting mechanism. The second wind power adjusting mechanism can be used for conducting different heat sections.
Preferably, the waste heat recovery unit comprises a heat-conducting rotary cylinder, the outer cover of the heat-conducting rotary cylinder is arranged in the outer cover, one end of the heat-conducting rotary cylinder is connected with the discharging unit, the other end of the heat-conducting rotary cylinder is connected with the cooling unit, the heat-conducting rotary cylinder is driven by the second driving unit, a fourth wind power adjusting mechanism is arranged at one end of the outer cover, and the fourth wind power adjusting mechanism is connected with the ignition unit.
It should be noted that the internal structures of the preheating unit, the roasting unit and the heat-conducting rotary drum are not introduced in the invention, and the common structures in the prior art can be selected, namely, the blades are arranged in the heat-conducting rotary drum, and the materials are enabled to run forwards through rotation.
Preferably, the roasting unit is provided with a first temperature sensor, the preheating unit is provided with a second temperature sensor, a third temperature sensor is arranged in the outer cover, the first, second and third temperature sensors are connected with a control module, the control module is further connected with a first, second, third and fourth wind power adjusting mechanisms, and the control module is further connected with a first driving unit and a second driving unit.
Preferably, the first, second, third and fourth wind power adjusting mechanisms each comprise a plurality of inlets, adjustable valves arranged at the inlets and a blowing device.
The invention also discloses an application of the rotary kiln heat energy circulating system, which comprises the following steps:
s1, starting an ignition unit and a first wind power adjusting mechanism, heating a roasting unit, adjusting a mode of a second wind power adjusting mechanism, and realizing internal circulation of heat of the roasting unit until the temperature of the roasting unit reaches C1; the equipment is first heated to a suitable temperature before calcination, reducing the waiting time. The temperature of the roasting unit rises faster through the internal circulation of the heat of the roasting unit.
S2, communicating the roasting unit with the preheating unit, adjusting a second wind power adjusting mechanism mode, and performing heat external circulation until the temperature of the preheating unit reaches C2; because roasting unit and preheating unit are UNICOM, preheating unit easily heaies up, in order to guarantee the temperature, need execute the extrinsic cycle, heat and keep warm simultaneously.
S3, starting feeding by the feeding unit, setting an initial speed V0 of the first driving unit, preheating the material in the preheating unit, and then entering the roasting unit for roasting; the material is cold material, and the original balance temperature is broken after the material is fed, so that the calcining quality is influenced, the material is operated at low speed, and excessive gas cannot overflow from the preheating unit due to low initial temperature.
S4, the roasted product enters the heat-conducting rotary drum from the discharging unit, the fourth wind power adjusting mechanism conveys heat to the ignition unit, and the third wind power adjusting mechanism conveys heat to the flue gas collecting unit; after the operation for a period of time, the temperature of the whole equipment is basically kept stable, the cooled heat is recovered, part of the heat enters the roasting unit, and the other part of the heat enters the preheating unit, so that the utilization rate of energy is effectively improved.
S5, acquiring the temperature of the preheating unit at intervals, obtaining a calculated temperature change rate K, and adjusting the speed of the first driving unit; because do not shut down work, the material constantly gets into and can make the temperature change, so operate with average speed and be unfavorable for guaranteeing the high quality of product, the defective percentage is higher, consequently can carry out variable speed operation according to temperature variation, if the temperature risees at the excessive speed, then speed promotes, reduces the dwell time at preheating unit, if the temperature reduces very fast then speed reduces, guarantees to preheat the effect.
The specific method for adjusting the first driving unit comprises the following steps:
s51, judging whether the temperatures of the preheating unit and the roasting unit exceed a threshold value or not; whenever a defined maximum temperature, i.e. a given threshold value, cannot be exceeded, it is therefore first determined whether the temperature exceeds the threshold value, and if so, it is justified that further steps need to be adjusted. If the threshold is not exceeded, speed adjustments may be made within the range to ensure optimal warm-up time.
S52, if the temperature change rate exceeds the preset temperature, executing the step S6, and if the temperature change rate does not exceed the preset temperature, calculating the temperature change rate K of the preheating unit;
s53, adjusting the speed V, V = VO (1 + K) according to the temperature change rate;
and S54, repeating the steps S51-S53. Since the temperature is in an unstable state, real-time adjustment is required to ensure that it is in a state that tends to stabilize.
S6, monitoring the first temperature sensor, the second temperature sensor and the third temperature sensor in real time, and adjusting the second wind power adjusting mechanism to perform internal heat circulation of the preheating unit when the temperature detected by the first temperature sensor exceeds C1; when the temperature of the roasting unit is too high, the roasting temperature needs to be reduced, the original external circulation is stopped, and the heat is only circulated in the preheating unit.
And S7, stopping the heat transmission from the fourth wind power adjusting mechanism to the ignition unit if the temperature detected by the first temperature sensor still exceeds C1 after the processing of the step S6. Because the waste heat recovery unit provides heat, therefore need stop the heat supply of waste heat recovery unit to the calcination unit, because the change of ignition unit can have great influence to whole temperature balance, generally do not select the temperature of adjusting the ignition unit, if the unable cooling condition appears, then the optional temperature adjustment of ignition unit.
Regarding the treatment of the tail gas treatment unit, the third wind adjusting mechanism can ensure 30% of opening degree, and part of the tail gas is conveyed to the tail gas treatment unit for tail gas treatment, and this heat loss is a reasonable loss, which cannot be avoided.
Preferably, the regulation scheme of the second wind power regulation mechanism comprises the construction of a temperature regulation model, and the second wind power regulation mechanism is a main regulation unit of the cycle and seriously influences the temperature balance in the cycle. The construction of the temperature regulation model comprises the following steps:
a1, acquiring the temperature of a first temperature sensor, and judging whether the temperature reaches a threshold value; the threshold value can be fixed or variable, and is determined by a plurality of experiments, and is usually set to be 1100-1300 ℃.
If the value is lower than the threshold value, the second wind power adjusting mechanism, the roasting unit and the ignition unit are selected to be conducted to form roasting internal circulation; if the temperature is lower than the threshold value, the temperature is not enough, the roasting cannot be carried out, the temperature needs to be heated, the roasting can be carried out, and the temperature needs to be quickly raised at the moment, so that the internal circulation is selected, the heat loss is reduced, and the temperature can be quickly and effectively raised.
If not, executing the next step; if the temperature is within the threshold value, the temperature is suitable for roasting, and the temperature of the roasting unit does not need to be adjusted, so that the balance can be kept.
A2, acquiring the temperature of the second temperature sensor, and judging whether the temperature reaches a threshold value; under the condition that the temperature of the roasting chamber is proper, namely the temperature of the preheating unit needs to be met, the preheating temperature cannot be too high or too low, and the threshold range is 400-600 ℃.
If the temperature is lower than the threshold value, the second wind power adjusting mechanism, the preheating unit, the roasting unit, the flue gas collecting unit and the ignition unit are selected to be conducted to form preheating internal circulation; through the heat transfer of the roasting unit, the temperature is effectively transferred to the preheating unit through heat movement, and the condition that the temperature is unstable due to the fact that new materials enter the preheating unit is avoided.
If not, executing the next step; if the temperature is not lower than the threshold value, the stable operation state is indicated.
A3, acquiring the temperature of the third temperature sensor, and judging whether the temperature reaches a threshold value;
if the threshold value is within the range, executing the step A2; the temperature change during cooling is indicated to be within the threshold value. The preheating temperature needs to be controlled.
If the value is lower than the threshold value, the step A1 is executed. When the temperature is lower than the threshold value, the fourth wind power adjusting mechanism needs to suck back to transfer part of heat in the roasting kiln, and in the process, the temperature in the roasting chamber changes, so the step A1 needs to be executed to ensure the temperature in the roasting chamber. If the temperature is lower than the threshold value, the cooling speed is too high, so that strong temperature shrinkage stress is generated inside and on the surface of the ceramsite, and reticular fine cracks are generated on the surface of the ceramsite, so that the particle strength of the ceramsite is reduced.
Compared with the prior art, the invention has the beneficial effects that:
according to the rotary kiln heat energy circulating system, the preheating unit and the roasting unit form internal communication and external communication through the internal communication structure, and the whole temperature circulation is reasonable, the temperature control is rapid and accurate by combining the arrangement of the wind power adjusting mechanism, so that the internal part is in a stable circulating state.
According to the application of the rotary kiln heat energy circulating system, different circulating modes are selected through obtaining temperatures of different areas, real-time adjustment is carried out according to different influence factors, the stable circulation is kept based on positive effects, temperature adjustment and rotation speed adjustment are combined, and accurate control of preheating temperature, roasting temperature and cooling temperature is guaranteed. Can reduce the defective rate, improve the energy utilization rate and reduce the energy consumption. Solves the problems of low heat utilization rate and poor calcination quality of the existing ceramsite rotary kiln.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural diagram of an internal communication structure according to the present invention;
FIG. 3 is a schematic view of the heat flow at step S1 of the present invention;
FIG. 4 is a schematic view of the heat flow at step S2 of the present invention;
FIG. 5 is a schematic view of the heat flow at step S4 of the present invention;
FIG. 6 is a schematic diagram of the heat flow in step S8 of the present invention.
Reference numerals are as follows: 1. a roasting unit; 10. a waste heat recovery unit; 100. a first wind power adjusting mechanism; 101. a housing; 102. a heat-conducting rotary drum; 103. a second driving unit; 104. a fourth wind power adjusting mechanism; 11. a cooling unit; 12. a tail gas treatment unit; 2. a preheating unit; 3. a feed unit; 4. a flue gas collection unit; 401. a third wind power adjusting mechanism; 5. a discharging unit; 6. an ignition unit; 7. a first driving unit; 9. an internal communication structure; 901. a heat-insulating shell; 902. a second wind power adjusting mechanism; 905. a first retainer ring; 906. a second retainer ring; 907. and an air outlet cover.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the rotary kiln heat energy circulation system of the embodiment includes a roasting unit 1 and a preheating unit 2, one end of the preheating unit 2 is connected with a feeding unit 3 and a flue gas collecting unit 4, one end of the roasting unit 1 is connected with a discharging unit 5 and an ignition unit 6, one end of the flue gas collecting unit 4 is connected with a tail gas processing unit 12, an internal communication structure 9 is arranged between the roasting unit 1 and the preheating unit 2, the discharging unit 5 is connected with a waste heat recovery unit 10, one end of the waste heat recovery unit 10 is connected with a cooling unit 11, the waste heat recovery unit 10 is connected with the preheating unit 2, the other end is connected with the ignition unit 6, the roasting unit 1 is provided with a first wind power adjusting mechanism 100, the first wind power adjusting mechanism 100 is cooperated with the ignition unit 6 for heat supply and adjustment, the specific structure of the ignition unit 6 is a conventional design, which is not detailed here.
The internal communicating structure 9 comprises a heat-insulating shell 901, one end of a preheating unit 2 is rotatably arranged in the heat-insulating shell 901, one end of a roasting unit 1 is rotatably arranged in the heat-insulating shell 901, one ends, extending into the heat-insulating shell 901, of the preheating unit 2 and the roasting unit 1 are respectively provided with a first retainer ring 905, a second retainer ring 906 is arranged in the heat-insulating shell 901, the first retainer ring 905 and the second retainer ring 906 form a comb tooth crossing structure, the preheating unit 2 and the roasting unit 1 are connected into a whole to form a connecting section, the connecting section is provided with air outlet holes, the air outlet holes are provided with filter screens to prevent materials from entering, the heat-insulating shell 901 is provided with connecting through holes, the connecting through holes are externally provided with air outlet covers 907, the air outlet covers 907 are connected with second wind power adjusting mechanisms 902, air flow enters through the air outlet holes, sequentially passes through the comb tooth sections and enters the air outlet covers 907 from the connecting through holes, the air outlet holes and the connecting through holes are distributed in a staggered manner to play a certain thermosiphon effect, the air flow rate can be automatically improved, the second wind power adjusting mechanisms 902 are connected with the ignition unit 902, and the roasting unit 1 and the preheating unit 2 are provided with a first driving unit 7. The preheating unit 2 and the roasting unit 1 are integrated and driven to operate through the first driving unit 7, spiral blades are arranged in the roasting unit 1 and the preheating unit 2, and materials are driven to be transported in the cylinder body through integral rotation.
A third wind adjusting mechanism 401 is arranged in the flue gas collecting unit 4. The third wind adjusting mechanism 401 is used for conducting and conveying in different cycles, and can ensure a certain degree of normal opening to convey tail gas to the tail gas treatment unit 12 for tail gas treatment.
To reduce the piping layout and to further manage the thermal cycle, the flue gas collection unit 4 is connected to the firing unit 6 by a second wind adjustment mechanism 902.
The waste heat recovery unit 10 comprises a heat-conducting rotary cylinder 102, an outer cover 101 is arranged in the outer cover 101, one end of the heat-conducting rotary cylinder 102 is connected with the discharging unit 5, the other end of the heat-conducting rotary cylinder 102 is connected with the cooling unit 11, the heat-conducting rotary cylinder 102 is driven by a second driving unit 103, one end of the outer cover 101 is provided with a fourth wind power adjusting mechanism 104, and the fourth wind power adjusting mechanism 104 is connected with the ignition unit 6. The structure of the waste heat recovery unit 10 is common equipment in the field, in order to recover heat in the cooling process, a fourth temperature sensor is used for detecting temperature change in the cooling process and judging the cooling process, 3 temperature sensors can be arranged in the outer cover 101, including two ends and the middle part, and the roasted ceramsite in the cooling process can be rapidly cooled to 1000-700 ℃ after passing through an expansion zone with the highest temperature; however, when the temperature is between 700 ℃ and 400 ℃, slow cooling is required, because rapid cooling causes strong temperature shrinkage stress inside and on the surface of the ceramsite, which causes the surface of the ceramsite to generate reticular fine cracks, so that the strength of the granules of the ceramsite is reduced, but rapid cooling can be performed below 400 ℃.
The roasting unit 1 is provided with a first temperature sensor, the preheating unit 2 is provided with a second temperature sensor, a third temperature sensor is arranged in the outer cover 101, the first temperature sensor, the second temperature sensor and the third temperature sensor are connected with a control module, the control module is further connected with a first wind power adjusting mechanism, a second wind power adjusting mechanism, a third wind power adjusting mechanism and a fourth wind power adjusting mechanism, and the control module is further connected with a first driving unit and a second driving unit. The first, second, third and fourth wind power adjusting mechanisms comprise a plurality of access ports, and adjustable valves and air blowing equipment which are arranged at the access ports. The adjustable electromagnetic regulating valve is selected to conduct in different cycles, and the specific conducting mode can be seen in the cycles in the figure.
The embodiment also discloses application of the rotary kiln heat energy circulating system, which comprises the following steps:
s1, starting an ignition unit 6 and a first wind power adjusting mechanism 100, heating a roasting unit 1, adjusting an execution mode of a second wind power adjusting mechanism 902, and realizing internal circulation of heat of the roasting unit until the temperature of the roasting unit 1 reaches C1; as shown in fig. 3, the direction of the arrows indicates the direction of heat flow.
S2, the roasting unit 1 is communicated with the preheating unit 2, the mode of the second wind power adjusting mechanism 902 is adjusted, and heat external circulation is carried out until the temperature of the preheating unit 2 reaches C2; the loop execution mode is shown in fig. 4.
S3, feeding by the feeding unit 3, giving an initial speed V0 of the first driving unit 8, preheating the materials in the preheating unit 2, and then entering the roasting unit 1 for roasting;
s4, the roasted product enters the heat-conducting rotary cylinder 102 from the discharging unit 5, the fourth wind power adjusting mechanism 104 conveys heat to the ignition unit 6, and the third wind power adjusting mechanism 401 conveys heat to the smoke gas collecting unit 4; the cyclic mode, as shown in fig. 5.
S5, acquiring the temperature of the preheating unit 2 at intervals, obtaining a calculated temperature change rate K, and adjusting the speed of the first driving unit; the speed change changes the residence time in the furnace body, and the calcining quality can be effectively provided.
S6, monitoring the first temperature sensor, the second temperature sensor and the third temperature sensor in real time, and adjusting the second wind power adjusting mechanism 902 to perform heat internal circulation of the preheating unit 2 when the temperature detected by the first temperature sensor exceeds C1;
and S7, stopping the heat transmission from the fourth wind power adjusting mechanism 104 to the ignition unit 6 if the temperature detected by the first temperature sensor still exceeds C1 after the processing of the step S6.
S8, the third temperature sensor is required to be judged in the heating process, if the temperature is not within the threshold value, the situation of rapid cooling can occur, so that the temperature needs to be supplemented, the phenomenon of rapid cooling is prevented, the flowing direction of hot air flow is shown in figure 6, and the situation of no crack can be ensured in the cooling process.
The embodiment also discloses an adjusting method of the first driving unit, which comprises the following steps:
s51, judging whether the temperatures of the preheating unit and the roasting unit exceed a threshold value or not;
s52, if the temperature change rate K exceeds the preset temperature, executing the step S6, and if the temperature change rate K does not exceed the preset temperature, calculating the temperature change rate K of the preheating unit;
s53, adjusting the speed V, V = VO (1 + K) according to the temperature change rate;
and S54, repeating the steps S51-S53.
The embodiment further discloses that the adjusting scheme of the second wind adjusting mechanism comprises a temperature adjusting model, and the temperature adjusting model is constructed by:
a1, acquiring the temperature of a first temperature sensor, and judging whether the temperature reaches a threshold value;
if the value is lower than the threshold value, the second wind power adjusting mechanism, the roasting unit and the ignition unit are selected to be conducted to form roasting internal circulation;
if not, executing the next step;
a2, acquiring the temperature of the second temperature sensor, and judging whether the temperature reaches a threshold value;
if the temperature is lower than the threshold value, the second wind power adjusting mechanism, the preheating unit, the roasting unit, the flue gas collecting unit and the ignition unit are selected to be conducted to form preheating internal circulation;
if not, executing the next step;
a3, acquiring the temperature of the third temperature sensor, and judging whether the temperature reaches a threshold value;
if the threshold value is within the range, executing the step A2;
if the value is lower than the threshold value, the step A1 is executed.
According to the rotary kiln heat energy circulating system, different circulating modes are selected for different stages under different conditions, the circulating stability of the whole system is ensured under the operating state, materials are in a stable calcining state, the defective rate is reduced, and the energy utilization rate is improved.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The utility model provides a rotary kiln heat energy circulation system, includes calcination unit (1) and preheats unit (2), it is connected with feeding unit (3) and flue gas collection unit (4) to preheat unit (2) one end, calcination unit (1) one end is connected with ejection of compact unit (5) and ignition unit (6), tail gas processing unit (12), its characterized in that are connected to flue gas collection unit (4) one end:
an inner communication structure (9) is arranged between the roasting unit (1) and the preheating unit (2), the discharging unit (5) is connected with a waste heat recovery unit (10), one end of the waste heat recovery unit (10) is connected with a cooling unit (11), the waste heat recovery unit (10) is connected with the preheating unit (2), the other end of the waste heat recovery unit is connected with an ignition unit (6), and the roasting unit (1) is provided with a first wind power adjusting mechanism (100);
the inner communicating structure (9) comprises a heat insulation shell (901), one end of the preheating unit (2) is rotatably arranged in the heat insulation shell (901), one end of the roasting unit (1) is rotatably arranged in the heat insulation shell (901), one ends of the preheating unit (2) and the roasting unit (1) extending into the heat insulation shell (901) are respectively provided with a first retaining ring (905), a second retaining ring (906) is arranged in the heat insulation shell (901), and the first retaining ring (905) and the second retaining ring (906) form a comb tooth crossing structure;
the preheating unit (2) and the roasting unit (1) are connected into a whole to form a connecting section, air outlets are formed in the connecting section, a connecting through hole is formed in the heat preservation shell (901), an air outlet cover (907) is arranged outside the connecting through hole, the air outlet cover (907) is connected with a second wind power adjusting mechanism (902), the second wind power adjusting mechanism (902) is connected with the ignition unit (6), and the roasting unit (1) and the preheating unit (2) are provided with a first driving unit (7).
2. The rotary kiln heat energy cycle system of claim 1, wherein: and a third wind power adjusting mechanism (401) is arranged in the smoke collecting unit (4).
3. The rotary kiln heat energy cycle system as claimed in claim 2, wherein: the smoke collecting unit (4) is connected with the ignition unit (6) through a second wind power adjusting mechanism (902).
4. The rotary kiln heat energy cycle system as claimed in claim 3, wherein: the waste heat recovery unit (10) comprises a shell (101) and a heat conduction rotary cylinder (102) arranged in the shell (101), one end of the heat conduction rotary cylinder (102) is connected with the discharging unit (5), the other end of the heat conduction rotary cylinder is connected with the cooling unit (11), the heat conduction rotary cylinder (102) is driven through a second driving unit (103), one end of the shell (101) is provided with a fourth wind power adjusting mechanism (104), and the fourth wind power adjusting mechanism (104) is connected with the ignition unit (6).
5. The rotary kiln heat energy cycle system of claim 4, wherein: the roasting unit (1) is provided with a first temperature sensor, the preheating unit (2) is provided with a second temperature sensor, a third temperature sensor is arranged in the outer cover (101), the first temperature sensor, the second temperature sensor and the third temperature sensor are connected with a control module, the control module is further connected with a first wind power adjusting mechanism, a second wind power adjusting mechanism, a third wind power adjusting mechanism and a fourth wind power adjusting mechanism, and the control module is further connected with a first driving unit and a second driving unit.
6. The rotary kiln heat energy cycle system of claim 5, wherein: the first, second, third and fourth wind power adjusting mechanisms comprise a plurality of access ports, and adjustable valves and air blowing equipment which are arranged on the access ports.
7. Use of a rotary kiln heat energy cycle system according to claim 6, comprising the steps of:
s1, starting an ignition unit (6) and a first wind power adjusting mechanism (100), heating the roasting unit (1), adjusting the mode of a second wind power adjusting mechanism (103), and realizing the internal heat circulation of the roasting unit until the temperature of the roasting unit (1) reaches C1;
s2, communicating the roasting unit with the preheating unit, adjusting the mode of a second wind power adjusting mechanism (902), and performing heat external circulation until the temperature of the preheating unit (2) reaches C2;
s3, feeding by the feeding unit (3), giving an initial speed V0 of the first driving unit (8), preheating the materials in the preheating unit (2), and then entering the roasting unit (1) for roasting;
s4, the roasted product enters a heat-conducting rotary cylinder (102) from a discharging unit (5), a fourth wind power adjusting mechanism (104) conveys heat to an ignition unit (6), and a third wind power adjusting mechanism (401) conveys heat to a flue gas collecting unit (4);
s5, acquiring the temperature of the preheating unit at intervals, obtaining a calculated temperature change rate K, and adjusting the speed of the first driving unit;
s6, monitoring the first temperature sensor, the second temperature sensor and the third temperature sensor in real time, and adjusting the second wind power adjusting mechanism (902) to perform internal heat circulation of the preheating unit when the temperature detected by the first temperature sensor exceeds C1;
and S7, stopping the heat transmission from the fourth wind power adjusting mechanism (104) to the ignition unit (6) if the temperature detected by the first temperature sensor still exceeds C1 after the processing of the step S6.
8. Use according to claim 7, characterized in that the adjustment method of the first drive unit comprises the following steps:
s51, judging whether the temperatures of the preheating unit and the roasting unit exceed a threshold value or not;
s52, if the temperature change rate exceeds the preset temperature, executing the step S6, and if the temperature change rate does not exceed the preset temperature, calculating the temperature change rate K of the preheating unit;
s53, adjusting the speed V, V = VO (1 + K) according to the temperature change rate;
and S54, repeating the steps S51-S53.
9. Use according to claim 8, characterized in that: the adjusting scheme of the second wind power adjusting mechanism comprises the following steps of constructing a temperature adjusting model, wherein the constructing of the temperature adjusting model comprises the following steps:
a1, acquiring the temperature of a first temperature sensor, and judging whether the temperature reaches a threshold value;
if the value is lower than the threshold value, the second wind power adjusting mechanism, the roasting unit and the ignition unit are selected to be conducted to form roasting internal circulation;
if not, executing the next step;
a2, acquiring the temperature of the second temperature sensor, and judging whether the temperature reaches a threshold value;
if the temperature is lower than the threshold value, the second wind power adjusting mechanism, the preheating unit, the roasting unit, the flue gas collecting unit and the ignition unit are selected to be conducted to form preheating internal circulation;
if not, executing the next step;
a3, acquiring the temperature of the third temperature sensor, and judging whether the temperature reaches a threshold value;
if the threshold value is within the range, executing the step A2;
if the value is lower than the threshold value, the step A1 is executed.
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| CN202211523799.3A CN115751990B (en) | 2022-11-30 | 2022-11-30 | Rotary kiln heat energy circulation system and application thereof |
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| CN202211523799.3A CN115751990B (en) | 2022-11-30 | 2022-11-30 | Rotary kiln heat energy circulation system and application thereof |
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| CN115751990B (en) | 2023-07-14 |
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