CN212511205U - Biomass straw combustion system for cement kiln - Google Patents
Biomass straw combustion system for cement kiln Download PDFInfo
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- CN212511205U CN212511205U CN202020477165.9U CN202020477165U CN212511205U CN 212511205 U CN212511205 U CN 212511205U CN 202020477165 U CN202020477165 U CN 202020477165U CN 212511205 U CN212511205 U CN 212511205U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/125—Fuels from renewable energy sources, e.g. waste or biomass
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Abstract
The utility model relates to the field of cement kiln equipment, in particular to a biomass straw combustion system for a cement kiln, which comprises a shed for stacking straws and a crusher for crushing the straws, wherein the outlet of the crusher is provided with a transmission mechanism which is connected with a metering and feeding system; the metering feeding system is connected with a rotary feeder; the rotary feeder is connected with the combustion device. The utility model discloses a living beings straw combustion system that cement kiln was used, through piling canopy, breaker, transport mechanism, measurement feed system, gyration down glassware and burner's setting, can realize the breakage and the follow-up burning of straw, can make the straw come the part as biomass fuel to replace cement kiln tradition coal fuel, reduce the pollution that tradition coal fuel brought.
Description
Technical Field
The utility model relates to a cement kiln equipment field is a living beings straw combustion system that cement kiln used particularly.
Background
The cement industry is a large consumer of coal resources and one of the key industries of energy conservation and emission reduction in China, and the cement kiln can reduce the coal consumption and NOx emission by using biomass fuel.
As a big agricultural country, the biomass fuel resources such as straws and the like are rich, the biomass straws are used for replacing the traditional coal fuel of the cement kiln, the biomass fuel has the advantages of less pollution after combustion, cement production doped with gray matter, emission reduction and the like, and the biomass fuel is an effective way for promoting low carbon, environmental protection and emission reduction of the cement industry and promoting efficient comprehensive utilization of the straws.
However, the straw has the problems of low substitution rate due to low heat value, poor combustion stability of the cement kiln, difficulty in storage, feeding and conveying and the like, and is not mature in application in cement plants.
Meanwhile, alkaline substances in the straws cause the skinning of the decomposing furnace to influence the operation of a production line, and although the straw biomass fuel is gradually applied to the electric power industry in China, the application of the straw biomass fuel in a cement plant is immature.
Therefore, the key technology of combining the high-energy consumption cement industry and the deep utilization of straw biomass is developed, and the novel biomass alternative fuel combustion equipment is developed, so that the biomass alternative fuel has become a main development trend of the biomass alternative fuel in the cement industry.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a combustion system that can be used for the cement kiln to living beings straw.
In order to realize the purpose, the utility model discloses a technical scheme be:
a biomass straw combustion system for a cement kiln comprises a shed for stacking straws and a crusher for crushing the straws, wherein a conveying mechanism is arranged at an outlet of the crusher and is connected with a metering and feeding system; the metering feeding system is connected with a rotary feeder; the rotary feeder is connected with the combustion device.
The combustion system further comprises a straw storage reservoir; the crusher is connected with the straw storage room through a conveying mechanism.
The metering and feeding system comprises a metering scale, and the metering scale is connected with a buffering and flow stabilizing bin; the conveying mechanism is connected with the metering scale through the buffer steady flow bin.
The conveying mechanism comprises a primary conveying mechanism for connecting the crusher and the straw storage warehouse; the primary conveying mechanism comprises a primary belt conveyor; one end of the primary belt conveyor is positioned below the outlet of the crusher, and the other end of the primary belt conveyor extends to the feed inlet of the straw storage warehouse
The conveying mechanism also comprises a secondary conveying mechanism used for connecting the straw storage warehouse with the metering scale; the second grade transport mechanism includes ejection of compact scraper conveyor, the discharge gate at the straw repository is connected to ejection of compact scraper conveyor one end, and the other end is connected with measurement feed system through transporting the belt.
The metering scale is connected with a distributing valve; and the outlets of the material distributing valves are respectively connected with the rotary feeder through connecting pipelines.
Each rotary feeder is connected with a straw feeding pipeline through a communicating pipeline, and the end part of the straw feeding pipeline is connected with a fan for supplying air.
The combustion system also comprises a combustion device for combustion, the combustion device comprises a furnace body, and a feeding mechanism for feeding materials and fuel is arranged on the furnace body; the feeding mechanism comprises a throwing component for throwing materials and a feeding component for throwing fuel; the furnace body is connected with an air inlet pipeline for the tertiary air to enter; the feeding component comprises a feeding pipeline which is arranged on the furnace body and used for feeding materials; the feeding component comprises a coal powder feeding pipeline and a biomass fuel feeding pipeline; a material feeding channel is arranged on the feeding pipeline, and a coal powder feeding channel is arranged on the coal powder feeding pipeline; a biomass throwing channel is arranged on the biomass fuel feeding pipeline; the central lines of the material feeding channel, the coal powder feeding channel and the biomass feeding channel are intersected.
The pulverized coal feeding pipeline and the biomass fuel feeding pipeline are distributed on two sides of the feeding pipeline.
The combustion device is provided with a plurality of feeding mechanisms, and all feeding components are uniformly distributed on the furnace body.
The processing technology of the biomass straw combustion system for the cement kiln is characterized by comprising the following steps of:
(1) straw storage: the original straws are sent into a cement factory after being subjected to packaging operation, and the other side is in a shed;
(2) crushing straws: the straw fine crusher is arranged in the piling shed, materials are placed on the plate link chain machine by a forklift or a grab bucket machine during production, and the plate link chain machine conveys bundled straws to a crusher hopper when in operation; conveying the crushed straws to a straw storage room through a belt conveyor;
(3) straw storage and kiln conveying: the straw storage warehouse adopts a concrete square warehouse design, a scraper discharging device is arranged in the square warehouse, the scraper discharging device uniformly and stably conveys materials to a discharge port of the straw storage warehouse, straws discharged from the discharge port flow into a scraper conveyor, the scraper conveyor drives the straws above the scraper conveyor to move, so that the straws are conveyed to a transfer belt, and the transfer belt conveys the materials sent by the scraper conveyor to a stokehole metering and feeding system; the straw material is conveyed into a buffering steady flow bin through a transfer belt, is stirred and then enters a metering scale or a rotor scale for metering, and is conveyed into a combustion device through pipeline air force after being locked by a rotary feeder; thereby realizing the combustion of the straw material.
The utility model has the advantages that:
the utility model discloses a biomass straw combustion system for cement kiln, which can realize the crushing and the subsequent combustion of the straw through the arrangement of a shed, a crusher, a conveying mechanism, a metering feeding system, a rotary feeder and a combustion device, and can ensure that the straw is used as biomass fuel to partially replace the traditional coal fuel of the cement kiln, thereby reducing the pollution caused by the traditional coal fuel; the utility model discloses a combustion system discloses regards biomass straw as alternative fuel from front end broken handle, stores the technology until the in-kiln processing of cement, makes it can satisfy the cement mill serialization, automatic production requirement to improve biomass fuel's substitution rate, guarantee to use the stability of alternative fuel back kiln system operating mode and do not influence grog product quality, finally realize straw biomass fuel minimizing, innocent treatment, improve enterprise economy and social.
Drawings
The contents of the various figures of the specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the metering and feeding system of the present invention when connected to a combustion device.
Fig. 3 is a front view of the combustion apparatus of the present invention.
Fig. 4 is a cross-sectional view taken along a-a of fig. 3.
The labels in the above figures are:
1. furnace body, 2, input pipeline, 3, buggy charge-in pipeline, 4, biomass fuel charge-in pipeline, 5, intake stack.
Detailed Description
The following description of the preferred embodiments of the present invention will be made in further detail with reference to the accompanying drawings.
What need explain in advance here, what the utility model discloses in heap canopy, breaker, transport mechanism, measurement feed system, gyration glassware adopted all is prior art, has optimized the mode of overall arrangement throughout this year mainly, reaches the technological effect that single part can not reach through the cooperation between the part.
A biomass straw combustion system for a cement kiln comprises a shed 6 for stacking straws and a crusher 7 for crushing the straws, wherein a conveying mechanism is arranged at an outlet of the crusher 7 and is connected with a metering and feeding system; the metering and feeding system is connected with a rotary feeder 15; the rotary feeder 15 is connected with a combustion device; the utility model discloses shed 6 is used for storing straw, simply is a factory warehouse, and breaker 7 is used for carrying out crushing treatment to straw with larger size; the conveying mechanism is used for transferring the crushed straws, and the metering and feeding system is used for controlling the biomass fuel to enter the combustion device, namely the weight of the straws in the decomposing furnace; the rotary blanking device 15 mainly has the function of locking air and then entering the decomposing furnace; the combustion device is used for burning the straws, so that the generated heat energy can convert the materials (namely raw materials) put in from the putting component into the clinker, and the production of the subsequent procedures is facilitated.
Preferably, the combustion system of the present invention further comprises a straw storage 9; the straw storage 9 provides a place for placing crushed straws, and is convenient to match with a metering and feeding system to quantitatively feed materials to a combustion device; in addition, as preferred, the straw storage warehouse 9 of the utility model is internally provided with a scraper unloading device 91; here the scraper discharge device can be of foreign technology, such as the scraper discharge device disclosed in model B3500-XT01, or a simple scraper discharge device can be used, such as: the scraper discharging device is a scraper, the scraper is connected with a driving mechanism, such as an air cylinder, a conveyor belt and the like, and the fine crushed straws in the straw storage can be discharged outside to enter the next working procedure through the movement of the scraper in the straw storage; the scraper discharge device 91 can discharge the crushed straws in the straw storage 9, so that the crushed straws can fall onto the storage scraper conveyor conveniently, and the crushed straws can be transported conveniently; the crusher 7 is connected with a straw storage 9 through a conveying mechanism; the storage of the crushed straws is convenient.
Preferably, the metering and feeding system of the utility model comprises a metering scale, wherein the metering scale is connected with a buffer steady flow bin 12; the conveying mechanism is connected with the metering scale through a buffer steady flow bin 12; the buffering steady flow bin 12 has a good stabilizing effect, and broken straws are prevented from directly entering the rotor scale 13 to be measured and impact the rotor scale 13, so that the whole system is more smooth in transition.
Preferably, the conveying mechanism in the utility model comprises a primary conveying mechanism 8 for connecting the crusher 7 and the straw storage 9; the primary conveying mechanism 8 comprises a primary belt conveyor; one end of the primary belt conveyor is positioned below the outlet of the crusher 7, and the other end of the primary belt conveyor extends to the feed inlet of the straw storage 9; the primary conveying mechanism 8 can ensure that the crushed straws enter the straw storage 9 from the crusher 7; in addition, the conveying mechanism in the utility model also comprises a second-stage conveying mechanism for connecting the straw storage warehouse 9 and the weighing scale; the secondary conveying mechanism comprises a discharging scraper conveyor 10, one end of the discharging scraper conveyor 10 is connected to a discharging port of the straw storage warehouse 9, and the other end of the discharging scraper conveyor is connected with the metering feeding system through a transfer belt 11; through the arrangement of the secondary conveying mechanism, the crushed straws can be transferred into the metering and feeding system from the straw storage 9; the quantity of the straws entering the combustion device can be conveniently and accurately controlled subsequently; the scraper conveyor plays the effect of horizontal pay-off, transports the belt and transports the straw in small, broken bits to setting for the height, uses through the cooperation of scraper conveyor and transport belt, can realize the straw in small, broken bits from the low to the transport of eminence.
Preferably, the metering scale in the utility model is connected with a distributing valve 14; the outlet of the distributing valve 14 is connected with a rotary feeder 15 through a connecting pipeline respectively; each rotary feeder 15 is connected with a straw feeding pipeline through a communication pipeline, and the end part of the straw feeding pipeline is connected with a fan 16 for supplying air; the fuel distributing valve 14 has a flow distributing function, and then the connecting pipeline, the communicating pipeline and the straw feeding pipeline are matched for use, so that multi-pipeline feeding operation can be performed on the combustion device according to the requirement; the problem of insufficient fuel caused by single-position feeding of the straws is avoided; the material distributing valve is a known technology, and aims to enable materials discharged by the metering scale to enter different pipelines as required through the arrangement of the material distributing valve so as to provide a basis for multi-position material supply of a subsequent combustion device; the problem of uneven combustion in the furnace caused by single-position feeding of the straws is avoided.
Preferably, the middle combustion system of the utility model further comprises a combustion device for combustion, wherein the combustion device comprises a furnace body, and a feeding mechanism for feeding materials and fuel is arranged on the furnace body; the feeding mechanism comprises a throwing component for throwing materials and a feeding component for throwing fuel; the furnace body is connected with an air inlet pipeline for the tertiary air to enter; the feeding component comprises a feeding pipeline which is arranged on the furnace body and used for feeding materials; the feeding component comprises a coal powder feeding pipeline and a biomass fuel feeding pipeline; a material feeding channel is arranged on the feeding pipeline, and a coal powder feeding channel is arranged on the coal powder feeding pipeline; a biomass throwing channel is arranged on the biomass fuel feeding pipeline; the central lines of the material feeding channel, the coal powder feeding channel and the biomass feeding channel are intersected; the utility model discloses a combustion device of a fuel complementary system, which can supply a plurality of fuels into a furnace body 1 through the optimization of a feeding mechanism, and can well solve the problem that the inner wall of the furnace body 1 is easy to crust in the industry; meanwhile, the large-scale production of cement clinker can be met, resources are saved, the production cost is reduced, and the reduction and harmless disposal of biomass fuels such as straws and the like are realized; the utility model discloses a view from the whole, the utility model discloses a combustion device, in fact is just the complementary device of many fuel, through the cooperation of biomass fuel and buggy, can guarantee better that the fuel is fully burnt at combustion device, is favorable to the effective decomposition of raw meal; the combustion device cannot be caused by C l in biomass fuel-、Na2O and K2The introduction of harmful components such as O causes the occurrence of risks such as skinning; simultaneously the utility model discloses the tertiary air is rotary-cut motion in furnace body 1 to the intermixture between raw meal, biomass fuel and the buggy of better assurance.
Preferably, in the utility model, the feeding pipeline 2 is provided with a material feeding channel, and the pulverized coal feeding pipeline 4 is provided with a pulverized coal feeding channel; a biomass throwing channel is arranged on the biomass fuel feeding pipeline 3; the central lines of the material feeding channel, the coal powder feeding channel and the biomass feeding channel are intersected; due to the arrangement, materials, biomass fuels and coal dust can be thrown to the position close to the center of the furnace body 1, so that the subsequent mixing of tertiary air, the materials, the coal dust and the biomass fuels can be facilitated, and the subsequent combustion mixing is facilitated.
Preferably, in the utility model, the pulverized coal feeding pipeline 4 and the biomass fuel feeding pipeline 3 are distributed on two sides of the throwing pipeline 2; the arrangement is convenient for follow-up air intake matched with tertiary air, can ensure sufficient combustion of the biomass fuel and the coal dust, and simultaneously avoids the problems of skinning and the like caused by alkaline substances in the biomass fuel on the inner wall of the furnace body 1.
Preferably, the biomass fuel feeding pipeline 3 is arranged close to the throwing pipeline 2; due to the arrangement, the material can quickly contact with the biomass fuel after cooling the tertiary air, and the primary decomposition of the material can be realized; in addition, as a larger optimization, the included angle interval of the horizontal projection between the biomass fuel feeding pipeline 3 and the throwing pipeline 2 in the utility model is 10-30 degrees; by adopting the arrangement mode within the distinguishing range, the biomass fuel can be contacted with the material more quickly, and meanwhile, the biomass fuel on the surface can deflagrate, so that the primary decomposition of the biomass fuel on the material can be ensured; in practical use, the included angle interval may be 25 degrees.
Preferably, the included angle between the horizontal projection of the pulverized coal feeding pipeline 4 and the horizontal projection of the throwing pipeline 2 in the utility model is 30-60 degrees; due to the arrangement, the biomass fuel is mixed with the materials to realize primary combustion decomposition, and then is contacted and mixed with the coal powder, so that the fuel can be continuously supplied; the aim is to continuously and effectively decompose the biomass fuel and the coal powder; in practice the angle is conventionally chosen to be 45, although other angles may be used.
Preferably, the utility model disclosesThe air inlet pipeline is positioned below the feeding mechanism; by the arrangement, the tertiary air can be mixed with the material firstly, and the temperature of the tertiary air can be reduced after the material is mixed with the tertiary air, so that high temperature and high O are avoided2The concentrated tertiary air is directly mixed with the high-volatile biomass fuel, so that the deflagration phenomenon is avoided.
Preferably, the air inlet pipeline is obliquely arranged, so that the tertiary air can do rotary cutting motion along the inside of the furnace body 1, the subsequent materials and the fuel can be conveniently mixed, and the subsequent combustion and the decomposition of the materials can be better ensured; in addition, the air inlet pipeline is preferably arranged close to the material feeding pipeline 2; an opening at one end of the air inlet pipeline close to the furnace body 1 extends towards a biomass fuel feeding pipeline 3 in an adjacent feeding mechanism; the tertiary air can be mixed with the material firstly, and the temperature of the tertiary air can be reduced after the material is mixed with the tertiary air, so that high temperature and high O are avoided2The concentrated tertiary air is directly mixed with the high-volatile biomass fuel, so that the deflagration phenomenon is avoided.
Preferably, in the utility model, the lowest ends of the pulverized coal feeding channel and the biomass fuel feeding channel are positioned on the same plane; the mixing uniformity of the tertiary air, the pulverized coal and the biomass fuel can be ensured, the continuous supply of the fuel is ensured, and the continuous operation of a combustion tank is ensured; in addition, the plane of the lower end of the material feeding channel is higher than the planes of the lower ends of the coal feeding channel and the biomass fuel feeding channel, so that the tertiary air and the materials are uniformly mixed, and the lowest end of the material feeding channel is higher than the planes of the coal feeding channel and the biomass fuel feeding channel; the material ventilation channel, the coal material feeding channel and the biomass fuel feeding channel have height difference, so that the mixed material and tertiary air are better mixed with the biomass material; the uniformity of the combustion of the materials and the fuel is better ensured.
Preferably, the combustion device of the utility model is provided with a plurality of feeding mechanisms, and all feeding components are uniformly distributed on the furnace body 1; the subsequent arrangement is convenient, and meanwhile, the full decomposition of the materials can be better ensured; the detonation problem is avoided; during actual distribution, the pulverized coal feeding pipeline 4, the material feeding pipeline 2 and the fuel feeding pipeline in each feeding mechanism are sequentially distributed on the furnace body 1 clockwise; the distance between each other is adjusted according to actual needs.
Preferably, in the utility model, the air inlet pipe is provided with a flow regulating valve; the air inlet quantity of the air inlet pipeline can be adjusted; the tertiary air enters the furnace body 1 through an air inlet pipeline, and the tertiary air entering the furnace body 1 contacts with the material firstly and then contacts with the biomass fuel; with the arrangement, the tertiary air can be mixed with the material firstly, and the temperature of the tertiary air can be reduced after the material is mixed with the tertiary air, so that high temperature and high O are avoided2The concentrated tertiary air is directly mixed with the high-volatile biomass fuel, so that the deflagration phenomenon is avoided; in addition, the pulverized coal has longer combustion time, can continuously and effectively decompose materials, and ensures the uniformity of material decomposition.
Based on the above statements, the following discussion is made in connection with specific embodiments in order to more clearly express the innovative points of the present invention.
The utility model discloses a burner is actually exactly a double fuel complementary unit, through biomass fuel and buggy segmentation co-combustion to the realization is to the abundant decomposition of material.
The specific reasons are the combustion characteristics of biomass alternative fuels, such as high volatile content, high flammability (deflagration), low burning resistance and low heat value; meanwhile, with global energy development and comprehensive resource utilization, the cement industry has a trend towards the use of traditional low-grade coal, and the low-grade coal has the characteristics of high ash content, low volatile component and the like;
the utility model discloses just combine the burning characteristics of biomass fuel and inferior coal to carry out resource synthesis and use, through optimizing burner's overall structure, realize that the matching of tertiary air, biomass fuel, buggy and material is used, guarantee fuel high efficiency and utilize, the material fully decomposes.
The method specifically comprises the following steps: the furnace body 1 is provided with two feeding mechanisms, and each feeding mechanism comprises a coal powder feeding pipeline 4, a material feeding pipeline 2 and a biomass fuel feeding pipeline 3; the biomass fuel feeding pipeline is connected with the straw feeding pipeline, and meanwhile, the biomass of the utility model can adopt the straws mentioned above; from the top view, the two feeding mechanisms are symmetrically arranged; the device is characterized by being calibrated to a coal powder feeding pipeline I4-1, a material feeding pipeline I2-1, a biomass fuel feeding pipeline I3-1, a coal powder feeding pipeline II4-2, a material feeding pipeline II2-2 and a biomass fuel feeding pipeline II 3-2; each pipeline is sequentially distributed in the furnace body 1 in an annular way; the inlet of the air inlet pipeline is positioned below the material feeding pipeline 2; as shown in the drawings.
When the biomass fuel mixer works, firstly, the air inlet pipeline is connected with a high-temperature tertiary air input device, tertiary air rotary cutting is mixed with materials input from the material input pipeline II2-2, and then the tertiary air rotary cutting is mixed with biomass fuels input from the biomass fuel feed pipeline II3-2, and the design mainly aims at preventing high temperature and high O2The concentrated tertiary air is directly mixed with the high-volatile biomass fuel to generate a deflagration phenomenon; the temperature of the entering tertiary air can be reduced by adding the low-temperature raw materials, so that the problems are effectively avoided;
designing the position of a biomass fuel feeding point to be close to a raw material feeding point, and controlling the design angle within 25 degrees; the preliminary combustion of the raw materials can be better ensured, and the influence on the mixing of the raw materials and the biomass fuel due to long distance is avoided; meanwhile, the phenomenon that the mixing of raw materials and biomass fuel is influenced due to the close distance can be avoided.
After continuous work, the tertiary air is continuously and rotatably cut to the lower end of a feeding channel in the coal powder feeding pipeline I4-1, the temperature of the tertiary air mixed with the material feeding pipeline II2-2 and the biomass fuel feeding pipeline II3-2 is moderate, and the tertiary air is continuously mixed and combusted with the coal powder fed from the coal powder feeding pipeline I4-1, so that the coal powder has longer combustion time, and the materials fed into the furnace body 1 from the material feeding pipeline I2-1 and the material feeding pipeline II2-2 can be continuously and effectively decomposed; after continuous movement, the tertiary air is rotationally cut to the biomass fuel feeding pipeline I3-1, at the moment, because the tertiary air has been subjected to combustion and decomposition reaction with the coal, the biomass fuel and the raw meal at the front section, the tertiary air enters the biomass fuel feeding pipeline I3-1, and O at the cross section2The concentration is greatly reduced and basically has no explosionThe occurrence of the phenomenon of skin formation. And finally, the tertiary air moves to a coal powder feeding pipeline II4-2, and the tertiary air and the coal powder are continuously mixed for combustion and decomposition reaction. At this point, the entire fluid cross-section movement process is complete.
Based on the disclosure of the above content, the combustion device disclosed by the present invention can be developed, the fuel is put into the combustion device by different areas, the problem of local deflagration can be avoided, in addition, the rotary cutting direction of the tertiary air can be planned, the full utilization of the fuel can be better ensured, and the full decomposition of the material can be ensured at the same time.
The processing technology of the biomass straw combustion system for the cement kiln is characterized by comprising the following steps of:
1. straw storage: the original straws are sent into a cement factory after packaging operation, the moisture content of the straws entering the factory is required to be not higher than 20%, the straws are packaged and piled in a piling shed 6 by a forklift, the designed storage amount needs to meet the usage amount of a cement kiln 5d, and the specific storage amount is determined according to the actual requirement;
2. crushing straws: the straw fine crusher 7 is arranged in the piling shed 6, during production, a forklift or a grab bucket machine is used for pushing materials into a horizontal feeding section of the plate link chain machine, the material pushing speed is controlled, the quantity of bale feeding in unit time is controlled, and when the plate link chain machine operates, bales are conveyed to a hopper of the crusher 7; the particle size of the crushed straws is controlled within 50mm (the two-dimensional size is less than 80mm), so that the substitute fuel is fully combusted in the decomposing furnace; the crushed straws are conveyed to a straw storage 9 through a belt conveyor;
3. storing and conveying broken straws in a kiln: the straw storage 9 adopts a concrete square bin design, a scraper discharging device 91 is arranged in the bin, and materials are uniformly and stably discharged into a discharging scraper conveyor 10 through an artificial intelligent control system when the discharging amount of the materials meets the requirement of furnace burning; then the materials sent out by the scraper conveyor are conveyed to a stokehole metering and feeding system through a transfer belt 11;
4. according to the characteristics of straw combustion (extremely flammable and high volatility), the direct combustion scheme of the decomposing furnace is adopted in the process of putting the alternative fuel into the kiln, and a new alternative fuel feeding point is arranged at the position of an upper combustor of a decomposing furnace cylinder close to a C4 cyclone discharging point, so that the phenomena of deflagration and local high temperature in the furnace are avoided; straw fuel is conveyed into the buffering and steady flow bin 12 through a belt, enters a rotor scale for metering after being stirred, is conveyed into a decomposing furnace for combustion through pipeline gas power after being locked by the rotary feeder 15, and the feeding and combustion operation of the straw is finished.
Additionally, the utility model discloses in to the cement manufacture line of 5000t/d, the straw fuel substitution volume is less than 20%, can adopt the single channel to carry to the dore furnace, if the substitution rate improves to 20 ~ 40%, need adopt the binary channels, just need add branch material valve 14, specifically set up as required.
The straw substitute fuel pneumatic conveying adopts a Roots blower 16 for air supply, the configured air quantity is designed according to 3.5kg of straw/m 3 air, and the pipe diameter of a straw feeding pipeline for conveying the straw is calculated according to the air speed of 25-30 m/s.
The most ash content of the straws is SiO2 and CaO, and the most ash content of the straws can be used as raw materials to be added, and the design of the ingredients is adjusted; mixing the straw ash and the raw materials, and then feeding the mixture into a decomposing furnace, namely the combustion device, wherein the straw ash is used as a raw material of subsequent clinker; mixing the straw ash accounting for 1-2% of the total amount of the subsequent clinker with the raw materials, and adding the mixture into a decomposing furnace; the material proportioning is adjusted according to the chemical components of the raw materials such as limestone, sandstone, clay and the like in combination with the ash component of the straw, so that the clinker rate value is controlled, and the chemical components and the mineral composition of the clinker are not greatly changed.
The ash content of the straw contains harmful components of alkali and Cl < - > ions, the fuel substitution amount exceeds 15 percent or Cl < - > in clinker exceeds 350ppm, a bypass air-releasing and chlorine-removing system needs to be arranged, part of chlorine-containing dust gas is extracted from a smoke chamber, dust is recovered by dust collecting equipment after the dust is quenched by a cooling system, and the influence on the operation of a cement kiln system and the product quality is reduced.
Obviously the specific implementation of the present invention is not limited by the above-mentioned manner, and various insubstantial improvements made by the method concept and technical solution of the present invention are all within the protection scope of the present invention.
Claims (10)
1. A biomass straw combustion system for a cement kiln is characterized by comprising a shed for stacking straws and a crusher for crushing the straws, wherein a conveying mechanism is arranged at an outlet of the crusher and is connected with a metering and feeding system; the metering feeding system is connected with a rotary feeder; the rotary feeder is connected with the combustion device.
2. The biomass straw combustion system for the cement kiln as claimed in claim 1, wherein the combustion system further comprises a straw storage; the crusher is connected with the straw storage room through a conveying mechanism.
3. The biomass straw combustion system for the cement kiln as claimed in claim 1, wherein the metering and feeding system comprises a metering scale, and the metering scale is connected with a buffer steady flow bin; the conveying mechanism is connected with the metering scale through the buffer steady flow bin.
4. The biomass straw combustion system for the cement kiln as claimed in claim 1, wherein the conveying mechanism comprises a primary conveying mechanism for connecting the crusher and the straw storage warehouse; the primary conveying mechanism comprises a primary belt conveyor; one end of the primary belt conveyor is positioned below the outlet of the crusher, and the other end of the primary belt conveyor extends to the feed inlet of the straw storage warehouse.
5. The biomass straw combustion system for the cement kiln as claimed in claim 4, wherein the conveying mechanism further comprises a secondary conveying mechanism for connecting the straw storage and the metering scale; the second grade transport mechanism includes ejection of compact scraper conveyor, the discharge gate at the straw repository is connected to ejection of compact scraper conveyor one end, and the other end is connected with measurement feed system through transporting the belt.
6. The biomass straw combustion system for the cement kiln as claimed in claim 3, wherein the metering scale is connected with a material distributing valve; and the outlets of the material distributing valves are respectively connected with the rotary feeder through connecting pipelines.
7. The biomass straw combustion system for the cement kiln as claimed in claim 6, wherein each rotary feeder is connected with a straw feeding pipeline through a communicating pipeline, and the end of the straw feeding pipeline is connected with a fan for supplying air.
8. The biomass straw combustion system for the cement kiln as claimed in claim 1, wherein the combustion system further comprises a combustion device for combustion, the combustion device comprises a furnace body, and a feeding mechanism for feeding materials and fuel is arranged on the furnace body; the feeding mechanism comprises a throwing component for throwing materials and a feeding component for throwing fuel; the furnace body is connected with an air inlet pipeline for the tertiary air to enter; the feeding component comprises a feeding pipeline which is arranged on the furnace body and used for feeding materials; the feeding component comprises a coal powder feeding pipeline and a biomass fuel feeding pipeline; a material feeding channel is arranged on the feeding pipeline, and a coal powder feeding channel is arranged on the coal powder feeding pipeline; a biomass throwing channel is arranged on the biomass fuel feeding pipeline; the central lines of the material feeding channel, the coal powder feeding channel and the biomass feeding channel are intersected.
9. The biomass straw combustion system for the cement kiln according to claim 8, wherein the pulverized coal feeding pipeline and the biomass fuel feeding pipeline are distributed on two sides of the throwing pipeline.
10. The biomass straw combustion system for the cement kiln as claimed in claim 9, wherein a plurality of feeding mechanisms are arranged on the combustion device, and each feeding component is uniformly distributed on the furnace body.
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| CN202020477165.9U CN212511205U (en) | 2020-04-03 | 2020-04-03 | Biomass straw combustion system for cement kiln |
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| CN202020477165.9U CN212511205U (en) | 2020-04-03 | 2020-04-03 | Biomass straw combustion system for cement kiln |
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| CN202020477165.9U Active CN212511205U (en) | 2020-04-03 | 2020-04-03 | Biomass straw combustion system for cement kiln |
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