Low-calorific-value solid waste fuel and high-calorific-value solid fuel oxygen-controlled conversion heat balance method

Abstract

This invention provides a method for controlling the heat balance of oxygen-controlled thermal conversion using low-calorific-value solid waste fuel and high-calorific-value solid fuel. This method effectively solves the problem of calculating the amount of blended fuel, addressing issues such as deviations between actual operation and design, excessive investment, and high operating costs. The invention includes the following steps: Step 1, obtaining the composition of the low-calorific-value solid waste fuel and the blended high-calorific-value solid fuel, and calculating their respective lower heating values; Step 2, calculating the amount of air entering the furnace for both the low-calorific-value solid waste fuel and the high-calorific-value solid fuel under controlled-oxygen thermal conversion; Step 3, obtaining the overall balance formula Q based on the principle of energy conservation. 输入总 =Q 输出总 Step 4: Calculate Q by calculating the input heat of each input item fed into the reactor. 输入总 Step 5: Calculate Q by calculating the output heat of each of the output items after the reaction. 输出总 Step 6: Calculate the amount of auxiliary fuel to be added.

Description

Technical Field

[0001] This invention relates to a heat balance method for controlled oxygen conversion of low-calorific-value solid waste fuels in conjunction with high-calorific-value solid fuels, which can be used for heat balance calculations for the non-combustion resource utilization of low-calorific-value solid wastes such as sludge and perishable waste. Background Technology

[0002] In controlled-air thermal conversion (OAC) of solid waste fuels (excess air coefficient < 1), the fuel's own calorific value is insufficient to sustain the thermal conversion, necessitating the addition of high-calorific-value solid fuels. With an excess air coefficient α < 1, solid fuels can be converted into gaseous fuels rich in combustible gases such as carbon monoxide, hydrogen, and methane. Compared to direct combustion (α > 1), OAC converts solid fuels into cleaner gaseous fuels, resulting in more complete combustion, higher efficiency, and cleaner combustion gases. Currently, OAC of solid waste fuels has moved from academic research to engineering practice, and has been applied in numerous projects both domestically and internationally. However, compared to direct incineration, the mechanism of OAC is more complex, making it difficult to derive engineering design guidelines from microscopic mechanisms. This leads to a lack of theoretical calculation basis for currently operating and designing projects, with project design relying on experience and the amount of high-calorific-value solid fuel added depending entirely on intuition, resulting in deviations between actual operation and design, and ultimately, excessive investment or operating costs. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of the prior art and provide a reasonably designed method for controlling the oxygen conversion heat balance of low-calorific-value solid waste fuel and high-calorific-value solid fuel. This method can effectively calculate the amount of blended fuel and solves the problems of deviation between actual operation and design, excessive investment, and high operating costs.

[0004] The technical solution adopted by this invention to solve the above problems is: a method for controlling the oxygen conversion heat balance of low-calorific-value solid waste fuel and high-calorific-value solid fuel, specifically including the following steps:

[0005] Step 1: Obtain the composition of low-calorific-value solid waste fuel and high-calorific-value solid fuel blended with additives, and calculate their respective lower heating values;

[0006] Step 2: Calculate the amount of air entering the furnace for low-calorific-value solid waste fuel and high-calorific-value solid fuel under the oxygen-controlled thermal conversion process;

[0007] Step 3: Based on the principle of energy conservation, the overall equilibrium formula Q is obtained. 输入总 =Q 输出总 List the input and output items; among them:

[0008] Q 输入总 Total heat fed into the reactor;

[0009] Q输出总 : Total heat output after the reaction;

[0010] Step 4: Calculate Q by calculating the input heat of each input item fed into the reactor. 输入总 ;

[0011] Step 5: Calculate Q by calculating the output heat of each of the output items after the reaction. 输出总 ;

[0012] Step 6: Calculate the amount of auxiliary fuel to be added.

[0013] In step 1 of this invention, the lower heating values ​​of the two fuels are calculated according to the following equation:

[0014] (1) Lower heating value Q of low-calorific-value solid waste fuel ar低 =339×C ar低 +1030×H ar低 -109×(O ar低 -S ar低 )-25×M ar低 ;

[0015] in:

[0016] C ar低 The percentage of carbon content in low-calorific-value solid waste fuels;

[0017] H ar低 The percentage of hydrogen content in low-calorific-value solid waste fuels;

[0018] O ar低 The percentage of oxygen in low-calorific-value solid waste fuel;

[0019] S ar低 The percentage of sulfur content in low-calorific-value solid waste fuels;

[0020] M ar低 The percentage of water content in low-calorific-value solid waste fuels;

[0021] (2) Lower heating value Q of high-calorific-value solid fuels ar掺 =339×C ar掺 +1030×H ar掺 -109×(O ar掺 -S ar掺 )-25×M ar掺 ;

[0022] in:

[0023] C ar掺 The percentage of carbon content in high-calorific-value solid fuels;

[0024] H ar掺The percentage of hydrogen in high-calorific-value solid fuels;

[0025] O ar掺 The percentage of oxygen in high-calorific-value solid fuels;

[0026] S ar掺 The percentage of sulfur content in high-calorific-value solid fuels;

[0027] M ar掺 : Percentage of water content in high-calorific-value solid fuels.

[0028] In step 2 of this invention:

[0029] (1) Air volume V entering the furnace for low-calorific-value solid waste fuel 低 =W 低 ×[0.0889×C ar低 +0.265×H ar低 -0.0333×(O ar低 -S ar低 )]×α 低 ;

[0030] (2) Air volume V of high-calorific-value solid fuel 掺 =W 掺 ×[0.0889×C ar掺 +0.265×H ar掺 -0.0333×(O ar掺 -S ar掺 )]×α 掺 ;

[0031] in:

[0032] α 低 Excess air coefficient of low-calorific-value solid waste fuels;

[0033] α 掺 Excess air coefficient of high-calorific-value solid fuels;

[0034] V 低 Air volume entering the furnace for low-calorific-value solid waste fuel;

[0035] V 掺 Air volume entering the furnace for high-calorific-value solid fuels;

[0036] W 低 : Quality of low-calorific-value solid waste fuel entering the furnace;

[0037] W 掺 : Quality of high-calorific-value solid fuels fed into the furnace.

[0038] In step 3 of this invention:

[0039] Q 输入总 =Q低总 +Q 掺总 +Q 空总 ,

[0040] Q 输出总 =Q1+Q2+Q3+Q4,

[0041] Therefore, we get:

[0042] Q 低总 +Q 掺总 +Q 空总 =Q1+Q2+Q3+Q4,

[0043] in:

[0044] Q 低总 : Total heat input of low-calorific-value solid waste fuel;

[0045] Q 掺总 Total heat input of high-calorific-value solid fuels;

[0046] Q 空总 The material being introduced into the air has sensible heat;

[0047] Q1: Total sensible heat of the gas after the reaction;

[0048] Q2: Heat loss due to incomplete combustion in machinery;

[0049] Q3: Heat loss from the reactor;

[0050] Q4: The chemical internal energy of the gaseous fuel after the reaction.

[0051] In step 4 of this invention:

[0052] Calculate Q 低总 =Q ar低 ×W 低 ;

[0053] Calculate Q 掺总 =Q ar掺 ×W 掺 ;

[0054] Calculate Q 空总 =Q 空低 +Q 掺低 =V 低 ×q 显 +V 掺 ×q 显 =(V 低 +V 掺 )×q 空显 ;

[0055] in:

[0056] q 空显 Sensible heat of air at a given temperature.

[0057] In step 5 of this invention:

[0058] (1) Calculation Q CO , The reactants are CO, CO2, H2, CH4, O2, and N2, respectively. Sensible heat;

[0059] (2) Calculate Q2 = W 残碳 ×C 热值 ,

[0060] in:

[0061]

[0062] q 残碳 The percentage of solid carbon remaining in the ash residue;

[0063] C 热值 The heat energy generated by the combustion of a unit weight of carbon;

[0064] After converting the formula, we get:

[0065] Q2=(W 低 ×A ar低 +W 掺 ×A ar掺 )×q 残碳 ÷100×33000=330×(W 低 ×A ar低 +W 掺 ×A ar掺 )×q 残碳 ;

[0066] (3) Calculation

[0067] in:

[0068] Q ar.CO The lower heating value of carbon monoxide combustion;

[0069] The lower heating value of hydrogen combustion;

[0070] The lower heating value of methane combustion;

[0071] V CO Volume of carbon monoxide;

[0072] The volume of hydrogen gas;

[0073] The volume of methane.

[0074] In step 6 of this invention: the amount of auxiliary fuel added, W 掺 for:

[0075]

[0076] Compared with the prior art, the present invention has the following advantages and effects:

[0077] 1. In response to the practical situation in engineering projects where low-calorific-value solid waste fuels cannot sustainably undergo controlled oxygen thermal conversion and require the addition of high-calorific-value auxiliary fuels, a set of heat balance calculation methods has been invented for engineering design. This method simplifies the equilibrium boundary conditions and can effectively guide the operation of actual projects.

[0078] 2. Compared with the narrowness of previous project experience judgments, this invention patent has a wider range of applications and is suitable for the calculation of synergistic oxygen-controlled thermal conversion of various low-calorific-value solid waste fuels such as sludge and perishable waste with various industrial solid wastes.

[0079] 3. According to the present invention, the problem of calculating the amount of fuel to be added can be solved well, and the needs of engineering practice can be quickly guided. Attached Figure Description

[0080] Figure 1 This is a flowchart illustrating the method of the present invention. Detailed Implementation

[0081] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments described below are intended to facilitate the understanding of the present invention and do not constitute any limitation thereof.

[0082] For the practical engineering case of "co-gasification of municipal sludge and biomass pellets to produce high-quality fuel gas", the method of this invention is used to calculate the amount of biomass pellet fuel to be added. The specific steps are as follows:

[0083] Step 1: Obtain the composition of the low-calorific-value solid waste fuel and the high-calorific-value solid fuel blended with it, as shown in Table 1, and calculate their respective lower heating values. In this embodiment, the low-calorific-value solid waste fuel is municipal sludge, and the high-calorific-value solid fuel blended with it is biomass pellet fuel.

[0084] Table 1. Composition of low-calorific-value solid waste fuels and blended high-calorific-value solid fuels.

[0085]

[0086] Calculate the lower heating value of the two fuels based on the following equation:

[0087] (1) Lower heating value of municipal sewage sludge:

[0088] Q ar低 =339×Car低 +1030×H ar低 -109×(O ar低 -S ar低 )-25×M ar低 =339×14.95+1030×1.30-109×(11.70-1.43)-25×35=4412.62kJ / kg.

[0089] (2) Lower heating value of biomass pellets:

[0090] Q ar掺 =339×C ar掺 +1030×H ar掺 -109×(O ar掺 -S ar掺 )-25×M ar掺 =339×36.80+1030×5.32-109×(28.71-0.23)-25×7.90=14652.98kJ / kg.

[0091] in:

[0092] Q ar低 The lower heating value of low-calorific-value solid waste fuel, kJ / kg;

[0093] Q ar掺 The lower heating value of high-calorific-value solid fuels, kJ / kg;

[0094] Furthermore, the proportions of the various components in solid fuels are as follows:

[0095] C ar低 +H ar低 +O ar低 +N ar低 +S ar低 +A ar低 +M ar低 =100,

[0096] C ar掺 +H ar掺 +O ar掺 +N ar掺 +S ar掺 +A ar掺 +M ar掺 =100.

[0097] Step 2: Calculate the amount of air entering the furnace for low-calorific-value solid waste fuel and high-calorific-value solid fuel under the controlled oxygen thermal conversion process.

[0098] In this embodiment, the excess air coefficient α of municipal sludge 低 =0.3, the excess air coefficient α of the added biomass pellets 掺=0.4, the hourly feed rate of municipal sludge is 307.69 kg / h, and the hourly feed rate of biomass pellets is W. 掺 Calculate the amount of air entering the furnace, V. 低 and V 掺 .

[0099] Air volume V entering the furnace for low-calorific-value solid waste fuel 低 =W 低 ×[0.0889×C ar低 +0.265×H ar低 -0.0333×(O ar低 -S ar低 )]×α 低 =307.69×[0.0889×14.95+0.265×1.3-0.0333×(11.7-1.43)]×0.3=92.31Nm 3 / h;

[0100] Air volume V for high-calorific-value solid fuels 掺 =W 掺 ×[0.0889×C ar掺 +0.265×H ar掺 -0.0333×(O ar掺 -S ar掺 )]×α 掺 =W 掺 ×[0.0889×36.80+0.265×5.32-0.0333×(28.71-0.23)]×0.40=1.49W 掺 Nm 3 / h.

[0101] in:

[0102] α 低 Excess air coefficient of low-calorific-value solid waste fuels;

[0103] α 掺 Excess air coefficient of high-calorific-value solid fuels;

[0104] V 低 Air volume entering the furnace for low-calorific-value solid waste fuel, Nm³ 3 ;

[0105] V 掺 Air volume entering the furnace for high-calorific-value solid fuels, Nm³ 3 ;

[0106] W 低 : Mass of low-calorific-value solid waste fuel fed into the furnace, kg / h;

[0107] W 掺: Mass of high-calorific-value solid fuel fed into the furnace, kg / h.

[0108] Step 3: Based on the principle of energy conservation, the overall equilibrium formula Q is obtained. 输入总 =Q 输出总 List the input and output items;

[0109] In the controlled-oxygen thermal conversion process, the total heat fed into the reactor is equal to the total heat output after the reaction. The total heat fed into the reactor includes the input heat of low-calorific-value solid waste fuel, the input heat of high-calorific-value solid fuel, and the sensible heat of the input air. The total heat output after the reaction includes the sensible heat of the gas produced after the reaction, heat loss from incomplete mechanical combustion, heat dissipation from the reactor, and the chemical internal energy of the gas. Of the above output heat, the most valuable part in engineering practice is the chemical internal energy of the gas, mainly composed of combustible gases such as carbon monoxide, hydrogen, and methane. This chemical internal energy can be further converted into high-energy-density flue gas for various forms of energy conversion. In this invention example, to simplify the procedure, the small proportion of multi-carbon gas is not considered; only the effects of carbon monoxide, hydrogen, and methane are considered. Engineering experience shows that such simplification does not affect the accuracy requirements of the engineering design. Furthermore, in this embodiment, the temperature of the gas produced after controlled-oxygen conversion is 600°C.

[0110] Listing the input and output items, and providing a detailed explanation of each term in the balance formula, we can obtain the blending amount of high-calorific-value solid fuel.

[0111] Q 输入总 =Q 低总 +Q 掺总 +Q 空总 ,

[0112] Q 输出总 =Q1+Q2+Q3+Q4,

[0113] Therefore, we get:

[0114] Q 低总 +Q 掺总 +Q 空总 =Q1+Q2+Q3+Q4,

[0115] in:

[0116] Q 输入总 Total heat fed into the reactor, kJ / h;

[0117] Q 输出总 Total heat output after the reaction, kJ / h;

[0118] Q 低总 Total heat input of low-calorific-value solid waste fuel, kJ / h;

[0119] Q掺总 Total heat input of high-calorific-value solid fuels, kJ / h;

[0120] Q 空总 Sensible heat of the material entering the air, kJ / h;

[0121] Q1: Total sensible heat of the gas after the reaction, kJ / h;

[0122] Q2: Heat loss due to incomplete combustion of machinery, kJ / h;

[0123] Q3: Heat loss of the reactor, kJ / h;

[0124] Q4: Chemical internal energy of the gas after the reaction, kJ / h;

[0125] Because the calorific value of low-calorific-value solid waste combustion is relatively low (typically around 1000 kcal / kg), and oxygen-controlled thermal conversion (gasification or pyrolysis) is an endothermic reaction requiring a large amount of heat to convert energy from solid to gaseous substances, auxiliary combustion is necessary. This invention patent allows for the calculation of the required amount of auxiliary fuel in this type of engineering project, thus guiding engineering design and practice.

[0126] Step 4: Calculate Q by calculating the input heat of each input item fed into the reactor. 输入总 .

[0127] (1) Calculate Q 低总 :

[0128] In this project case, Q 低总 This refers to the total heat input of municipal sewage sludge, i.e.:

[0129] Q 低总 =Q ar低 ×W 低 =4412.62×307.69=1357719.05kJ / h.

[0130] (2) Calculate Q 掺总 :

[0131] In this project case, Q 掺总 This refers to the total heat input of biomass pellet fuel, i.e.:

[0132] Q 掺总 =Q ar掺 ×W 掺 =14652.98×W 掺 =14652.98W 掺 kJ / h.

[0133] (3) Calculate the sensible heat Q of the input air. 空总 :

[0134] Q 空总 =Q 空低 +Q 掺低 =V 低 ×q 显 +V 掺 ×q 显 =(V 低 +V 掺 )×q 空显 =

[0135] 26.8×(V 低 +V 掺 )=26.8×(92.31+1.49W 掺 )=

[0136] (2473.91+39.93W 掺 )kJ / h;

[0137] in:

[0138] q 空显 The sensible heat of air at a given temperature is a constant; at 20°C, it is 26.8 kJ / Nm³. 3 In engineering practice, 20°C is typically used as the benchmark temperature. Therefore, in this invention, q... 空显 Take a constant of 26.8 kJ / Nm 3 Therefore, we can obtain:

[0139] Q 空总 =26.8×(V) 低 +V 掺 ).

[0140] Calculate Q 输入总 :

[0141] Q 输入总 =Q 低总 +Q 掺总 +Q 空总 =1357719.05 + 14652.98W 掺 +2473.91 +39.93W 掺 = (1360192.96 + 14692.91W) 掺 )kJ / h.

[0142] Step 5: Calculate Q by calculating the output heat of each of the output items after the reaction. 输出总 .

[0143] Q 输出总 =Q1+Q2+Q3+Q4.

[0144] (1) Calculate Q1:

[0145] To calculate Q1, we first need to know the temperature of the fuel gas after controlled-oxygen thermal conversion, as well as the composition of each component. After controlled-oxygen thermal conversion, the fuel gas composition includes CO, CO2, H2, CH4, O2, N2, and H2O. Therefore, we should calculate the sensible heat of each component separately and then sum them up. Q CO , The sensible heats of CO, CO2, H2, CH4, O2, N2, and H2O after the reaction are respectively.

[0146] Taking this project as an example, municipal sludge and biomass are co-gasified, with an outlet gas temperature of approximately 600℃. The proportions of carbon monoxide, hydrogen, and methane in the gas are 10%, 1.0%, and 0.1%, respectively. Based on the law of conservation of mass, the composition of the remaining components in the gas can be calculated separately, or the gas composition can be detected using a gas composition analyzer. In this project embodiment, to better understand the present invention, the law of conservation of mass is used to calculate each component.

[0147] After controlled oxygen thermal conversion in this project, the total fuel gas volume is assumed to be V. 燃气 ,but:

[0148] The volume of carbon monoxide is: V CO =0.10×V 燃气 ;

[0149] The volume of hydrogen gas is:

[0150] The volume of methane is:

[0151] Water vapor volume: Considering that all the hydrogen in the fuel gas comes from the fuel itself and exists as hydrogen, methane, and water after thermal conversion, the volume of water vapor can be calculated:

[0152]

[0153] Volume of carbon dioxide: Considering that all the carbon in the fuel gas comes from the fuel itself, and after thermal conversion exists in the forms of carbon monoxide, methane, and carbon dioxide, the volume of carbon dioxide can be calculated:

[0154]

[0155] Oxygen Volume: Due to the use of controlled-oxygen thermal conversion, the excess air coefficient is less than 1, and theoretically, the fuel gas contains almost no oxygen. Therefore, in this embodiment of the invention, the oxygen volume is considered to be equal to 0, that is:

[0156]

[0157] Furthermore, the oxygen in the gas comes from the oxygen in the fuel and the oxygen in the air. According to this mass balance equation, W can be obtained.掺 With V 燃气 The proportional relationship between them is:

[0158]

[0159] get:

[0160] (92.31+1.49W 掺 )×0.42+50.4+0.40W 掺 =0.10×V 燃气 +44.8 +0.6W 掺 -0.012V 燃气 +2×(42.9+0.34W 掺 -0.101V 燃气 ),

[0161] Right now:

[0162] V 燃气 =363.4 + 2.2W 掺 ;

[0163] Nitrogen volume: Nitrogen comes from nitrogen elements in the fuel and nitrogen from the added air, thus the total amount of nitrogen in the fuel gas can be obtained:

[0164]

[0165] V 燃气 Use W 掺 Substitution yields the volumes of each component in the gas as follows:

[0166] V CO =0.10×V 燃气 =36.34 + 0.22W 掺 ,

[0167]

[0168] At 600℃, the sensible heat of each gas is a constant, which can be found in the engineering handbook, as shown in Table 2. Therefore, the final Q1 composition is obtained.

[0169] Table 2. Sensible heat of various gases at 600℃.

[0170]

[0171]

[0172] (2) Calculate Q2:

[0173] The heat loss due to incomplete mechanical processes is mainly caused by the unutilized solid carbon remaining in the ash. The amount of solid carbon remaining in the ash can be obtained by multiplying the residual carbon ratio by the amount of ash.

[0174] Q2 = W 残碳 ×C 热值 ,

[0175] in:

[0176]

[0177] q 残碳 The percentage of solid carbon remaining in the ash residue;

[0178] C 热值 The heat energy of combustion per unit weight of carbon, which is a theoretical constant, is taken as 33000 kJ / kg;

[0179] Therefore, after transforming the formula, we get:

[0180] Q2=(W 低 ×A ar低 +W 掺 ×A ar掺 )×q 残碳 ÷100×33000=330×(W 低 ×A ar低 +W 掺 ×A ar掺 )×q 残碳 ,

[0181] In this project example, the residual carbon in the ash is approximately 0.3%, therefore:

[0182] Q2 = 330 × (307.69 × 34.45 + W) 掺 ×17.34)×0.003=10493.9+17.12W 掺 .

[0183] (3) Calculate Q3:

[0184] The heat dissipation of the reactor is caused by radiative and convective heat transfer, and varies depending on the manufacturing process, insulation, and size of the reactor, making it difficult to measure with fixed parameters and formulas. Based on engineering experience, the heat dissipation of the reactor accounts for 0.5%-1.5% of the total heat generation. In this example, Q3 is considered to be 1% of the total input energy.

[0185] (4) Calculate Q4:

[0186] Q4 is the chemical internal energy of the fuel gas after oxygen-controlled thermal conversion, mainly supplied by combustible gases such as carbon monoxide, hydrogen, and methane.

[0187]

[0188] in:

[0189] Q ar.CO The lower heating value of carbon monoxide combustion is a constant, taken as 12640 kJ / Nm³. 3 ;

[0190] The lower heating value of hydrogen combustion is a constant, taken as 10790 kJ / Nm³. 3 ;

[0191] The lower heating value of methane combustion is a constant, taken as 35880 kJ / Nm³. 3 ;

[0192] V CO Volume of carbon monoxide, Nm 3 ;

[0193] Volume of hydrogen gas, Nm 3 ;

[0194] Volume of methane, Nm 3 ;

[0195] Therefore, after transforming the formula, we get:

[0196]

[0197] Step 6: Calculate the amount of auxiliary fuel to be added.

[0198] According to Q 输入总 =Q 输出总 By reorganizing steps 1-5 above, we obtain the following equilibrium formula:

[0199]

[0200]

[0201] After combining like terms, the final auxiliary fuel blending amount W is obtained. 掺 for:

[0202]

[0203] Ultimately, we obtained:

[0204] (1360192.96+14692.91W 掺 ) × 0.99 = 113451.9 + 1514.7W 掺 +10493.9 +17.12W 掺 +511422+3068.4W 掺 ,

[0205] get:

[0206] W 掺 =71.5 kg / h.

[0207] Specifically, in the practical engineering case of "co-gasification of municipal sludge and biomass pellets to produce high-quality fuel gas," the method of this invention processes 307.69 kg of municipal sludge per hour, requiring an additional 71.5 kg of biomass pellet fuel. The calculation method in this example is consistent with the actual engineering data, demonstrating that the calculation method of this invention can be used in engineering applications and guide engineering practice.

[0208] Furthermore, it should be noted that all equivalent or simple variations made based on the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this invention or exceed the scope defined in these claims, all of which should fall within the protection scope of this invention.

Claims

1. A method for controlling the oxygen conversion heat balance of low-calorific-value solid waste fuel and high-calorific-value solid fuel, characterized in that: Includes the following steps: Step 1: Obtain the composition of low-calorific-value solid waste fuel and high-calorific-value solid fuel blended with additives, and calculate their respective lower heating values; In step 1, the lower heating values ​​of the two fuels are calculated according to the following equation: (1) Low calorific value of solid waste fuel Q ar低 = 339 x C ar低 + 1030 x H ar低 - 109 x (O ar低 - S ar低 ) - 25 x M ar低 ; in: C ar低 : percentage of carbon content in low-calorific-value solid waste fuel; H ar低 : percentage of hydrogen content in low-calorific-value solid waste fuel Q ar低 : percentage of oxygen content in low-calorific-value solid waste fuel S ar低 The percentage of sulfur content in low-calorific-value solid waste fuels; M ar低 The percentage of water content in low-calorific-value solid waste fuels; (2) Lower heating value Q of high-calorific-value solid fuels ar掺 =339×C ar掺 +1030×H ar掺 -109×(O ar掺 -S ar掺 -25×M ar掺 ; in: C ar掺 The percentage of carbon content in high-calorific-value solid fuels; H ar掺 The percentage of hydrogen in high-calorific-value solid fuels; O ar掺 The percentage of oxygen in high-calorific-value solid fuels; S ar掺 The percentage of sulfur content in high-calorific-value solid fuels; M ar掺 The percentage of water content in high-calorific-value solid fuels; Step 2: Calculate the amount of air entering the furnace for low-calorific-value solid waste fuel and high-calorific-value solid fuel under the oxygen-controlled thermal conversion process; In step 2: (1) Air volume V entering the furnace for low-calorific-value solid waste fuel 低 =W 低 ×[0.0889×C ar低 +0.265×H ar低 -0.0333×(O ar低 -S ar低 )]×α 低 ; (2) Air volume V of high calorific value solid fuel 掺 =W 掺 ×[0.0889×C ar掺 +0.265×H ar掺 -0.0333×(O ar掺 -S ar掺 )]×α 掺 ; in: α 低 Excess air coefficient of low-calorific-value solid waste fuels; α 掺 Excess air coefficient of high-calorific-value solid fuels; V 低 : Air volume entering the furnace for low-calorific-value solid waste fuel; V 掺 Air volume entering the furnace for high-calorific-value solid fuels; W 低 The quality of low-calorific-value solid waste fuel entering the furnace; W 掺 : The mass of high-calorific-value solid fuel entering the furnace; Step 3: Based on the principle of energy conservation, the overall equilibrium formula Q is obtained. 输入总 =Q 输出总 List the input and output items; among them: Q 输入总 Total heat fed into the reactor; Q 输出总 : Total heat output after the reaction; In step 3: Q 输入总 =Q 低总 +Q 掺总 +Q 空总 Q 输出总 =Q1+Q2+Q3+Q4, therefore we get: Q 低总 +Q 掺总 +Q 空总 =Q1+Q2+Q3+Q4; in: Q 低总 Total heat input from low-calorific-value solid waste fuels; Q 掺总 Total heat input of high-calorific-value solid fuels; Q 空总 The material being introduced into the air has sensible heat; Q1: Total sensible heat of the gas after the reaction; Q2: Heat loss due to incomplete combustion in machinery; Q3: Heat loss from the reactor; Q4: The chemical internal energy of the gaseous fuel after the reaction; Step 4: Calculate Q by calculating the input heat of each input item fed into the reactor. 输入总 ; In step 4: Calculate Q 低总 =Q ar低 ×W 低 ; Calculate Q 掺总 =Q ar掺 ×W 掺 ; Calculate Q 空总 =Q 空低 +Q 掺低 =V 低 ×q 显 +V 掺 ×q 显 =(V 低 +V 掺 )×q 空显 ; in: q 空显 Sensible heat of air at a given temperature; Step 5: Calculate Q by calculating the output heat of each of the output items after the reaction. 输出总 ; In step 5: (1) Calculation ;in The sensible heats of CO, CO2, H2, CH4, O2, N2, and H2O after the reaction are respectively. (2) Calculate Q2=W 残碳 ×C 热值 ,in: ； q 残碳 The percentage of solid carbon remaining in the ash residue; C 热值 The heat energy generated by the combustion of a unit weight of carbon; After converting the formula, we get: Q2=(W) 低 ×A ar低 +W 掺 ×A ar掺 (×q) 残碳 ÷100×33000=330×(W) 低 ×A ar低 +W 掺 ×A ar掺 (×q) 残碳 ; (3) Calculation , in: The lower heating value of carbon monoxide combustion; The lower heating value of hydrogen combustion; The lower heating value of methane combustion; Volume of carbon monoxide; Volume of hydrogen gas; Volume of methane; Step 6: Calculate the amount of auxiliary fuel to be added; In step 6: the amount of auxiliary fuel added, W 掺 for: 。

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