CN112662445A - Method for mixing and burning chicken manure and rice hull in biomass boiler - Google Patents
Method for mixing and burning chicken manure and rice hull in biomass boiler Download PDFInfo
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
A method for mixing and burning chicken manure and rice hull in a biomass boiler in the technical field of solid fuel mixing and blending methods of the biomass boiler comprises the following steps: firstly, screening a chicken manure and rice hull mixed material, corn straws, rice straws, reed stalks, pure rice hulls and waste wood boards as biomass fuel; secondly, performing full analysis on the biomass fuel; thirdly, selecting a key index as a blending control index from the aspects of influencing the combustion stability and the emission environmental protection of the boiler and reducing the soot formation and corrosion of a heating surface; fourthly, blending the chicken manure and rice hull mixed material with coarse limestone powder according to a certain proportion before blending with other fuels; and fifthly, blending the mixed material of the chicken manure and the rice hull and other fuels according to a reasonable ratio by taking the blending control index as a reference. The invention solves the problems of various biomass fuels, complex components, large characteristic difference, unreasonable mixing and influence on the combustion stability, emission environmental protection and operation safety of the boiler.
Description
Technical Field
The invention relates to a blending method in the technical field of biomass boiler solid fuel, in particular to a blending method for blending biomass boiler solid fuel by using total moisture, S element, CL element and K element2Biomass boiler with reasonable proportioning of four key indexes O to biomass fuelA method for mixing materials by burning chicken manure and rice hull.
Background
The biomass solid fuel is used as a clean renewable energy source and is a unique renewable carbon resource, not only has the characteristics of wide distribution and rich reserves, but also has the advantages of being renewable, environment-friendly, zero-emission of carbon dioxide and the like, and the effective utilization of the biomass energy source becomes an important way for solving the world energy problem and improving the living environment of human in the 21 st century.
As a big agricultural country, China has huge biomass energy reserves, the total amount of biomass such as various crop straws, wood waste and the like exceeds 10 hundred million tons, and the biomass solid fuel has good environmental benefits when being used for direct combustion power generation. In recent years, the poultry industry in China has been rapidly developed, and the poultry feeding quantity and the poultry egg yield have been kept the first world and the second world for poultry meat yield for many years. The rice hulls are commonly used as padding materials in the poultry large-scale breeding process, the moisture-proof and heat-preservation effects are achieved, and a large amount of chicken manure and rice hull mixed materials are generated along with the increase of the breeding amount of chickens.
The chicken manure can be used as an organic fertilizer after fermentation treatment, but the content of the chicken manure in the mixed material of the chicken manure and the rice hulls only accounts for about 20 percent, the fertilizer efficiency is far lower than that of pure chicken manure, and on the other hand, the mixed material contains 80 percent of the rice hulls, so that the mixed material has high flammability, can be used as a solid fuel to be mixed with other agriculture and forestry biomass fuels, can effectively remove residual germs in the chicken manure, and is low in cost due to the fact that the mixed material of the chicken manure and the rice hulls is mixed, and the mixed material of the chicken manure and the rice hulls is beneficial to improving the.
The biomass used as the fuel in the field of power generation has a plurality of advantages, but the biomass fuel has a plurality of varieties, complex components, large characteristic differences and regionality and seasonality, so that the biomass fuel is obviously different from the traditional fossil fuel. The straw fuel contains higher alkali metal elements and chlorine elements, and alkali metal salts are easily formed in the combustion process and condensed together with fly ash particles on a heating surface to form accumulated ash and coke blocks, so that the heat exchange effect of the heating surface of a boiler is reduced, and meanwhile, the corrosion of a heat exchange pipeline is aggravated; besides high contents of alkali metal elements and chlorine elements, the chicken manure and rice hull mixed material also contains higher moisture and sulfur elements, and the combustion stability of the boiler is influenced and the environmental-friendly emission and the operation safety of the boiler are also influenced due to overhigh mixing combustion proportion.
In order to ensure the quality of fuel entering a furnace, sampling inspection needs to be carried out on the fuel of a biomass power plant before the fuel enters the plant, and fuel blending needs to be carried out before the fuel enters the furnace for combustion, but at present, the management of the fuel blending of the biomass power plant is relatively extensive, the plant-entering inspection generally only comprises moisture, ash content, volatile matter, fixed carbon and a calorific value, the moisture and the calorific value are used as blending control indexes, the fuel blending does not consider how to reduce the ash deposition and corrosion on the heating surface of the boiler from the fuel end, the ash deposition on the heating surface of the biomass boiler at present is also a main reason that frequent shutdown for ash removal is seriously needed, and the continuous operation period of the biomass boiler at present only lasts about. If the mixing amount of the chicken manure and rice hull mixed material exceeds 20%, the continuous operation period of the boiler can be maintained for about one month, and non-stop accidents such as leakage, pipe explosion and the like occur frequently, so that the long-period stable operation and safety of the boiler are seriously influenced. Although the price of the chicken manure and rice hull mixed material is low, if the continuous operation time of the boiler is short, the number of electricity generation hours is reduced, the overhaul cost is increased, and the project economy may not be increased or decreased, so that the continuous stable operation period of the boiler needs to be prolonged while the blending proportion of the chicken manure and rice hull mixed material is improved, and the non-stop times are reduced.
In addition, the biomass boiler desulfurization system mostly adopts a furnace calcium spraying process route, the desulfurizer adopts quicklime powder, and the conveying mode adopts pneumatic conveying, so that the requirements on particle size and purity are high, the particle size of granularity is required to be less than 1mm, the purity is required to be more than 80%, the cost is high, the price per ton exceeds 400 yuan, and in addition, the sulfur content in the chicken manure and rice hull mixed material is high, the blending combustion proportion is increased, the consumption of the desulfurizer is increased, the desulfurization cost is further increased, and meanwhile, the high-load operation and even overload operation of the desulfurization system are caused, so that the environmental-friendly emission of the boiler cannot reach the standard, and safety hidden dangers.
Disclosure of Invention
The invention provides a method for mixing and burning chicken manure and rice hull in a biomass boiler aiming at the defects of the prior art. The present invention solves several problems: firstly, biomass fuels are various in types, complex in components and large in characteristic difference, and unreasonable fuel mixing combustion can affect the stability and safety of boiler combustion; secondly, the conventional fuel inspection and blending indexes cannot reduce the problems of ash deposition and corrosion on the heating surface of the boiler from the fuel end; thirdly, the contents of water, sulfur, chlorine and alkali metal elements in the mixed material of the chicken manure and the rice hull are high, and the unreasonable blending influences the combustion stability, the emission environmental protection and the operation safety of the boiler; fourthly, the problems of overload operation of a desulfurization system and high cost of calcium spraying in the furnace caused by the increase of the mixed combustion proportion of the chicken manure and the rice hull.
The invention is realized by the following technical scheme, and the invention comprises the following steps: firstly, screening a chicken manure and rice hull mixed material, corn straws, rice straws, reed stalks, pure rice hulls and waste wood boards as biomass fuel; secondly, performing total analysis on the biomass fuel, wherein the total analysis comprises industrial analysis, heat value analysis, element analysis, ash component analysis and ash fusibility analysis; thirdly, from the aspects of influencing the combustion stability and the emission environmental protection of the boiler and lightening the soot formation and the corrosion of the heating surface, the total moisture, the S element, the CL element and the K element are selected2Taking the four key indexes as the blending control indexes; fourthly, uniformly blending the chicken manure and rice hull mixed material with coarse limestone powder outside the furnace according to a certain proportion before blending the chicken manure and rice hull mixed material with other fuels; fifthly, blending the mixed material of the chicken manure and the rice hull with other fuels according to a reasonable ratio.
In the invention, the biomass fuel is used as renewable energy solid fuel, the combustion characteristics of the biomass fuel have certain similarity with coal, and the characteristic analysis indexes of the biomass fuel are the same as those of coal component analysis, including industrial analysis, heat value analysis, element analysis, ash component analysis, ash fusibility analysis and the like; the industrial analysis mainly comprises the analysis of the moisture, ash content, volatile matter and fixed carbon of the fuel, and the content difference of the ash content, the volatile matter and the fixed carbon of various biomass fuels is small because of the content difference of various cropsThe growth characteristics and the harvesting time are different, so that the difference of the moisture content of the biomass fuel is large, a large amount of heat can be brought away by the moisture in the combustion process, the heat value of the biomass fuel is directly influenced, and the moisture content can indirectly reflect the heat value of the biomass fuel; the element analysis mainly comprises C, H, O, N, S, CL and other element analysis, wherein C, H and O are main components, the content difference of various biomass fuels is small, N element is basically below 1% and basically has no influence on the biomass characteristics, and S and CL elements are less in content but directly applied to environment-friendly emission of a boiler and corrosion of a heating surface of the boiler; during boiler combustion, the fusion and flowability of fuel ash can be accurately estimated according to ash components, and the corrosion of fly ash to combustion chamber and the contamination and slagging tendency of boiler can be judged according to the content of alkali metal oxides such as potassium and sodium in ash, which is mainly represented by K in the index of ash components2And (4) the content of O.
The invention selects the total water, the S element, the CL element and the K element from the aspects of influencing the combustion stability of the boiler and reducing the soot deposition and the corrosion on the heating surface of the boiler2And the O four chemical examination indexes are used as quality blending control indexes and are applied to the fuel blending management of the biomass power plant.
Furthermore, in order to improve the mixing proportion of the chicken manure and rice hull mixed material, high-quality fuel with complementary characteristics is selected as supplementary fuel, and in order to ensure the combustion stability of the boiler and reduce the ash deposition and corrosion of the heated area of the boiler, the total moisture, the S element, the CL element and the K element2The four mass blending indexes of O are respectively controlled within 25 percent, 0.2 percent, 0.35 percent and 12 percent. From the analysis of the total analysis result of the biomass fuel, when the blending proportion of the chicken manure and rice hull mixture is increased, in order to control the moisture content, the blending proportion of the rice hulls, the reeds and the waste wood boards is increased; to control the S element and K2The content of O, rice husk and reed mixing amount should be increased; in order to control the content of the CL element, the doping amount of the waste wood board is increased; the corn straw and the rice straw are only suitable for serving as supplementary fuel, but the corn straw and the rice straw are large in supply quantity and high in cost performance, and the mixing quantity of the corn straw and the rice straw is properly increased from the viewpoint of ensuring the fuel diversity and the supply stability.
Further, the maximum blending amount of the chicken manure and rice hull mixed material is controlled to be below 45%, when the blending amount of the chicken manure and rice hull mixed material is 40-45%, the blending amount of reed stalks is 15-20%, the blending amount of pure rice hulls is 15-20%, the blending amount of waste wood boards is 15-20%, and the blending total amount of corn straws and rice straws is controlled to be below 10%.
Further, when the mixing amount of the chicken manure and rice hull mixed material is 35-40%, the mixing amount of reed stalks is 15-20%, the mixing amount of pure rice hulls is 15-20%, the mixing amount of waste wood boards is 15-20%, and the mixing total amount of corn straws and rice straws is controlled to be below 20%.
Further, when the mixing amount of the chicken manure and rice hull mixed material is 30-35%, the mixing amount of reed stalks is 10-15%, the mixing amount of pure rice hulls is 10-15%, the mixing amount of waste wood boards is 10-15%, and the mixing total amount of corn straws and rice straws is controlled to be below 30%.
Further, the invention screens the fuel according to the blending index, when the biomass fuel contains all moisture, S element, CL element and K element2The four doping indexes of O are all under the condition of the following content, and the invention can be better realized.
Further, in order to ensure fuel diversity and fuel supply stability, an optimal blending scheme is provided, wherein the blending amount of the chicken manure and rice hull mixture is 31%, the blending amount of corn straws is 20%, the blending amount of rice straws is 10%, the blending amount of reed stalks is 13%, the blending amount of pure rice hulls is 13%, and the blending amount of waste wood boards is 13%.
Further, according to the invention, the granularity of the coarse wollastonite powder is less than 5mm, and the purity of the coarse wollastonite powder is more than 50%, and according to the sulfur content of the chicken manure and rice hull mixed material and the purity of the coarse wollastonite powder, the mixing proportion is calculated according to the Ca/S molar ratio of 2.5, and the coarse wollastonite powder and the chicken manure and rice hull mixed material are uniformly mixed outside the furnace.
Furthermore, the mixed material of the chicken manure and the rice hulls which is mixed with the coarse limestone powder is fed into a boiler for combustion and used up in the same day, so that potential safety hazards caused by long-time storage and heating of the coarse limestone powder in fuel are avoided.
Furthermore, the length of the straw fuel is required to be less than 15cm, the length, the width and the height of the waste wood board are required to be less than 10cm multiplied by 5cm multiplied by 3cm, and the technical requirements of a feeding system are met.
Compared with the prior art, the invention has the following beneficial effects: firstly, comprehensive analysis of fuel characteristics is beneficial to screening high-quality biomass fuel; second, select the total moisture, the S element, the CL element and the K2The four chemical examination indexes O are more scientific and comprehensive as blending control indexes, and contribute to reducing the boiler dust deposition, coking and corrosion from the fuel end; thirdly, a blending scheme of the chicken manure and rice hull mixed material is provided, so that the blending amount of the chicken manure and rice hull mixed material is increased, meanwhile, the fuel blending diversity and the supply stability are ensured, the main steam pressure and the temperature of the boiler are ensured to be more stable, the exhaust gas temperature is lower, and the thermal efficiency of the boiler is higher; and fourthly, a novel desulfurization process for adding the coarse limestone powder outside the furnace aiming at the chicken manure and rice hull mixed material is provided, so that the pressure of desulfurization in the furnace is favorably reduced, and the process is more economical.
Drawings
FIG. 1 is a flow chart of the blending process according to the embodiment of the present invention.
Detailed Description
The following embodiments of the present invention are described in detail with reference to the accompanying drawings, and the embodiments and specific operations of the embodiments are provided on the premise of the blending flow of the present invention, but the scope of the present invention is not limited to the following embodiments.
Example 1
The installed scale of an agriculture and forestry biomass power plant in a northeast region is 30MW, 1 120t/h high-temperature ultrahigh-pressure biomass circulating fluidized bed boiler is matched, the boiler parameters are 13.34MPa and 540 ℃, main fuels are local crop straws, chicken manure and rice hull mixed materials of a white feather chicken farm nearby a plant area, forestry wastes, local building waste wood boards and the like, and the fuel consumption per hour is about 30 tons.
Screening the biomass fuel:
the method is characterized by combining the seasonality, the supply amount and the fuel price of various local fuels, and screening the chicken manure and rice hull mixed material, corn straw, rice straw, reed straw, pure rice hull and waste wood board as boiler fuels.
And (3) full analysis of fuel components:
according to the latest edition of related detection methods and standards of solid biomass fuels released by the national standardization committee of China, the fuels are subjected to full analysis, and the analysis results are as follows:
TABLE 1 Industrial analysis of Biomass fuels
TABLE 2 elemental analysis of Biomass fuels
Table 3 biomass fuel ash composition test results
| Categories | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | TiO2 | SO3 | P2O5 | K2O | Na2O |
| Chicken manure and rice hull mixed material | 41.40 | 1.07 | 0.79 | 10.21 | 5.45 | 0.01 | 6.47 | 14.51 | 12.99 | 1.86 |
| Corn stalk | 42.66 | 2.66 | 1.16 | 10.80 | 7.25 | 0.10 | 1.06 | 2.66 | 21.18 | 0.30 |
| Pure rice husk | 88.14 | 0.90 | 0.51 | 1.26 | 0.46 | 0.10 | 0.66 | 0.97 | 4.14 | 0.24 |
| Rice straw | 74.67 | 0.83 | 0.45 | 4.42 | 3.16 | 0.26 | 2.21 | 1.08 | 8.53 | 2.14 |
| Reed pole | 77.92 | 0.42 | 0.31 | 3.37 | 1.34 | 0.01 | 2.06 | 0.54 | 5.76 | 3.02 |
| Waste wood board | 54.70 | 2.78 | 0.90 | 18.62 | 4.52 | 0.65 | 1.30 | 1.15 | 9.96 | 1.63 |
Table 4 biomass fuel ash fusibility test results
| Class of fuel | Deformation temperature DT (. degree. C.) | Softening temperature ST (. degree. C.) | Hemispherical temperature HT (. degree. C.) | Flow temperature FT (. degree. C.) |
| Chicken manure and rice hull mixed material | 1080 | 1150 | 1170 | 1180 |
| Corn stalk | 1110 | 1140 | 1180 | 1190 |
| Pure rice husk | ＞1500 | —— | —— | —— |
| Rice straw | 1210 | 1290 | 1320 | 1390 |
| Reed pole | 1180 | 1230 | 1260 | 1360 |
| Waste wood board | 1190 | 1290 | 1300 | 1320 |
Selecting fuel blending control indexes:
from the aspects of influencing the combustion stability and the emission environmental protection of the boiler and reducing the dust and corrosion on the heating surface, the total moisture, the S element, the CL element and the K element are selected2Taking four key indexes as blending control indexes; in order to improve the mixing proportion of the mixed materials of the chicken manure and the rice hull, high-quality fuel with complementary characteristics is selected as supplementary fuel, and simultaneously, the total moisture, the S element, the CL element and the K element are added2The four indexes of O are controlled within 25%, 0.2%, 0.35% and 12% respectively.
TABLE 5 comparative analysis table of fuel blending control indexes
Calculating a reasonable blending proportion:
the fuel blending is carried out according to the optimal blending scheme provided by the invention, and four blending control indexes can be controlled at a lower level.
TABLE 6 analysis table of the components of the fuel mixture according to the optimal blending scheme
Calculating the mixing proportion of the coarse limestone powder:
the sulfur content of the chicken manure and rice hull mixed material is 0.69 percent, the purity of purchased coarse limestone powder is 54.1 percent, the price of each ton is only about 90 yuan, and the mixing proportion of the coarse limestone powder and the chicken manure and rice hull mixed material is 1 according to the Ca/S molar ratio of 2.5: 31.
the calcium content of the coarse limestone powder is only 67% of that of the quicklime powder, and the desulfurization efficiency is slightly reduced due to the blending outside the furnace, so that the same desulfurization effect is achieved, the consumption of the coarse limestone powder is about twice of that of the quicklime powder, but the cost of the coarse limestone powder is less than one fourth of that of the quicklime powder, so that the running cost of the desulfurization by blending the coarse limestone powder outside the furnace is only less than half of that of the desulfurization by spraying calcium in the furnace, and the risk of overload running of a calcium spraying desulfurization system in the furnace due to the increase of the blending amount of the chicken manure and rice hull is avoided.
Uniformly blending the mixed material of the chicken manure and the rice hulls with the coarse limestone powder:
according to the optimal blending scheme, 223.2 tons of the mixed materials of the chicken manure and the rice hulls are consumed every day, about 20 tons of the mixed materials of the chicken manure and the rice hulls are consumed every day, about 10 cars of the mixed materials of the chicken manure and the rice hulls enter a factory every day, and each car of the mixed materials of the chicken manure and the rice hulls is uniformly blended every dayThe coarse limestone powder is mixed in a chicken manure and rice hull mixed material entering a factory, and according to the calculated mixing proportion of the coarse limestone powder, about 650 kg of the coarse limestone powder is mixed in each chicken manure and rice hull mixed material, and the weight is weighed based on the weight of fuel. Because the sulfur content of other biomass fuels is lower, the allowance is considered when the blending proportion of the coarse limestone powder is calculated, SO that the blending proportion of the coarse limestone powder can basically meet the requirement of desulfurization, and SO can be completely blended2To a discharge concentration of 50mg/Nm3Within the range, the requirement of environmental protection emission is met, and a calcium spraying system in the furnace is not started at ordinary times and is only used as a standby desulfurization means in emergency. In addition, the chicken manure and rice hull mixed material doped with the coarse limestone powder is used up in the same day, so that long-time storage is avoided.
Mixing the chicken manure and rice hull mixed material with other fuels:
the method comprises the following steps of uniformly blending the chicken manure and rice hull mixed material blended with the coarse limestone powder and other fuels according to the optimal blending scheme, performing layered material distribution and rolling blending on the mixed material and shell and wood fuels by utilizing the characteristics of light weight and bulkiness of the straw fuels and large gaps in the dough during blending, distributing the shell and wood fuels in three layers according to the blending ratio, sequentially distributing the shell and wood fuels in three layers, and uniformly blending after rolling for more than 3 times.
The uniformly mixed fuel can be stacked near the feeding port, and is conveyed to the front of the furnace through a feeding belt according to the boiler consumption, and then is conveyed into the furnace through a feeder to be combusted.
Examples 2 to 4:
when the blending ratio of the chicken manure and rice hull mixture was appropriately increased when the supply of the high-quality fuel was increased according to the seasonality and supply amount of the fuel, fuel blending calculation was performed based on the fuel composition analysis in example 1 to obtain the composition analysis of the mixed fuel of examples 2 to 4, as shown in tables 7 to 9.
Table 7 table for analyzing components of mixed fuel of example 2
Table 8 analysis table of mixed fuel composition in example 3
Table 9 table for analyzing components of mixed fuel of example 4
Example 5:
blending the coarse wollastonite powder and the chicken manure rice hull mixture, blending the chicken manure rice hull mixture blended with the coarse wollastonite powder and other fuels in sequence according to the blending proportion of the embodiment 2-4 and the steps in the embodiment 1, and feeding the mixture to a boiler for combustion.
In a biomass power plant of example 1, a year-round application study of an example of a blended chicken manure and rice hull blend was conducted according to the blending scheme of examples 1-5, and the main steam flow, main steam pressure, main steam temperature, SO, and main steam flow of a boiler during statistical tests were recorded2Emission concentration, number of times of blowing-out and non-stop times are shown in the following table.
Table 10 example operating data statistics table
Note: the boiler parameters were not taken into account as statistical mean values during the blow down period.
According to the application research of the embodiment of the method for mixing and burning the chicken manure and rice hull mixed materials 1-5 in a biomass power plant in the embodiment 1, the biomass boiler can basically run at full load, the main steam pressure and the temperature are within the allowable deviation of the design values, and SO is added2The discharge concentration is 50/Nm3And the continuous operation period exceeds three months, no non-stop accident occurs, and the operation effect is far beyond disorder blending.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A method for mixing and burning chicken manure and rice hull in a biomass boiler is characterized by comprising the following steps:
firstly, screening a chicken manure and rice hull mixed material, corn straws, rice straws, reed stalks, pure rice hulls and waste wood boards as biomass fuel;
secondly, performing total analysis on the biomass fuel, wherein the total analysis comprises industrial analysis, heat value analysis, element analysis, ash component analysis and ash fusibility analysis;
thirdly, from the aspects of influencing the combustion stability and the emission environmental protection of the boiler and lightening the soot formation and the corrosion of the heating surface, the total moisture, the S element, the CL element and the K element are selected2Taking four key indexes of O as quality blending control indexes, wherein the four quality blending indexes are respectively controlled within 25%, 0.2%, 0.35% and 12%;
fourthly, uniformly blending the mixed material of the chicken manure and the rice hulls with the coarse limestone powder outside the furnace according to a certain proportion before blending the mixed material with other fuels;
and fifthly, blending the mixed material of the chicken manure and the rice hull and other fuels according to a reasonable ratio by taking the blending control index as a reference.
2. The method for mixing the chicken manure and the rice hulls of the biomass boiler according to claim 1, wherein the maximum mixing amount of the chicken manure and the rice hulls is controlled to be below 45%, when the mixing amount of the chicken manure and the rice hulls is 40-45%, the mixing amount of reed stalks is 15-20%, the mixing amount of pure rice hulls is 15-20%, the mixing amount of waste wood boards is 15-20%, and the mixing total amount of corn straws and rice straws is controlled to be below 10%.
3. The method for mixing the chicken manure and the rice hulls of the biomass boiler according to claim 1, wherein when the mixing amount of the chicken manure and the rice hulls is 35-40%, the mixing amount of reed stalks is 15-20%, the mixing amount of pure rice hulls is 15-20%, the mixing amount of waste wood boards is 15-20%, and the mixing total amount of corn straws and rice straws is controlled to be below 20%.
4. The method for mixing the chicken manure and the rice hulls of the biomass boiler according to claim 1, wherein when the mixing amount of the chicken manure and the rice hulls is 30-35%, the mixing amount of reed stalks is 10-15%, the mixing amount of pure rice hulls is 10-15%, the mixing amount of waste wood boards is 10-15%, and the mixing total amount of corn straws and rice straws is controlled to be below 30%.
5. The method of mixing chicken manure and rice hulls for biomass boilers as claimed in any one of claims 1 to 4, wherein an optimal blending scheme is provided for ensuring fuel diversity and fuel supply stability, wherein the mixing amount of chicken manure and rice hulls is 31%, the mixing amount of corn stalks is 20%, the mixing amount of rice stalks is 10%, the mixing amount of reed stalks is 13%, the mixing amount of pure rice hulls is 13%, and the mixing amount of waste wood board is 13%.
6. The method for mixing the chicken manure and the rice hull of the biomass boiler as recited in any one of claims 1 to 5, wherein the mixing proportion of the coarse wollastonite powder and the chicken manure and the rice hull is calculated according to the sulfur content of the chicken manure and the rice hull and the purity of the coarse wollastonite powder, wherein the molar ratio of Ca to S is 2.5, the coarse wollastonite powder and the chicken manure and the rice hull are uniformly mixed outside the boiler, the granularity of the coarse wollastonite powder is less than 5mm, and the purity of the coarse wollastonite powder is more than 50%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113587137A (en) * | 2021-08-13 | 2021-11-02 | 山东水发智慧能源有限公司 | Biomass fuel blending combustion system for biomass boiler |
| CN113755223A (en) * | 2021-09-28 | 2021-12-07 | 西安热工研究院有限公司 | Low PM10Preparation method of discharged biomass fuel |
| CN114106901A (en) * | 2021-10-27 | 2022-03-01 | 中船重工（上海）新能源有限公司 | Preparation method of biomass fuel and biomass fuel |
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