CN113217922A - Method and system for predicting source output of NOx generated in waste incineration - Google Patents
Method and system for predicting source output of NOx generated in waste incineration Download PDFInfo
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Abstract
The invention discloses a method and a system for predicting the source output of NOx generated by waste incineration. The method comprises the following steps: (1) acquiring an initial fuel N conversion path diagram of an incineration plant; (2) detecting the element components and industrialized analytical components of the received base garbage, and calculating the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2F/(V + F); (3) correcting the conversion rate A of the volatile component N into the NOx according to the mass content ratio of the H/N element, and correcting the conversion rate A of the NOx into the N according to the ratio of the fixed carbon to the combustible component2Conversion rate B of (2); (4) the conversion rate η of the fuel N into NOx, the NOx generation concentration C are calculated. The system comprises: a fuel N conversion map loading module, a correction module, and a prediction module. The fuel N conversion rate predicted by the method and the corresponding NOx generation amount value range are more reliable, and the method and the device are mainly used for analyzing the variation trend of the fuel N conversion rate.
Description
Technical Field
The invention belongs to the field of solid waste management, and particularly relates to a method and a system for predicting the source production of NOx generated by waste incineration.
Background
The NOx control of domestic waste incineration plants in China mainly adopts a selective non-catalytic reduction (SNCR) denitration process, which can reach the discharge limit value of the pollution control Standard for domestic waste incineration (GB 18485-2014), and the NOx discharge concentration can be controlled at 150mg/Nm3Left and right. However, in order to fulfill the requirement of controlling the NOx emission of the ozone precursor in the action plan for preventing and treating atmospheric pollution, the strict limit of the NOx emission of the incineration plant has been reached, for example, the operating Specification of Life refuse treatment facilities in Shenzhen (SZDB/Z233-2017) requires the limit of the NOx emission to be 80mg/m3. To meet the lower and lower emission limit standards, the following two approaches are commonly used: (1) the serial Selective Catalytic Reduction (SCR) denitration process can further reduce the NOx emission concentration to 70mg/m3The average cost of each ton of domestic garbage is as high as40-70 yuan, most incineration plants are difficult to bear; (2) the existing SNCR denitration process is improved, the using amount of urea or ammonia water is increased, the NOx emission concentration can be further reduced, but the ammonia escape is increased, and the greater environmental pollution risk is caused. Therefore, there is a need for a method of reducing NOx emissions without significantly increasing the cost of denitration, the most direct method of which is to prevent the generation of NOx from the source.
The source production of NOx is often influenced by multiple factors, at present, most incineration plants adopt experience values, namely, the pollution prevention and control method which is carried out in the same way is adopted, however, due to the existence of regional differences, garbage compositions in various regions have large differences, the same denitration facility may cause insufficient treatment capacity to cause that the NOx discharge cannot stably reach the standard or the treatment capacity is excessive to cause the increase of ammonia escape risk and the increase of denitration cost.
Disclosure of Invention
The invention provides a method for predicting the N conversion rate and the NOx generation amount of fuel by the characteristics of refuse fuel in an incineration plant running under normal working conditions. The concentration range of NOx which is possibly generated can be predicted according to different regions and different fuels, and a theoretical basis can be provided for more accurately adding the denitration medicament.
To achieve the above object, according to one aspect of the present invention, there is provided a method for predicting a source generation amount of NOx generated by incinerating garbage, comprising the steps of:
(1) acquiring an initial fuel N conversion path diagram of an incineration plant, wherein the fuel N conversion path diagram in the incineration plant is a weighted directed graph, various existing forms of N element in the incineration process of the incineration plant are taken as nodes, the conversion reaction of the N element between different existing forms is taken as an edge, and the conversion rate of the N element between different existing forms is taken as a weight; the fuel N conversion path map nodes comprise fuel N element, volatile component N, fixed component N, NOx and N2；
(2) Detecting the element components and industrialized analytical components of the received base garbage, and calculating the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2F/(V + F); wherein H is the mass of H elementThe content, N is the mass content of the N element, V is the mass proportion of volatile components, and F is the mass proportion of fixed carbon;
(3) correcting the weight from the volatile component N (vol-N) node to the NOx node according to the principle that the weight from the volatile component N (vol-N) node to the NOx node is larger when the H/N element mass content ratio obtained in the step (2) is larger, namely the weight from the volatile component N (vol-N) node to the NOx node is larger, and according to the ratio of the fixed carbon to the combustible component obtained in the step (2), the weight from the volatile component N node to the NOx node is larger when the ratio of the fixed carbon to the combustible component is larger2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2Obtaining a corrected fuel N reforming path diagram;
(4) calculating a conversion rate eta of the fuel N into the NOx according to the fuel N conversion path diagram obtained in the step (3), and calculating a NOx generation concentration C (mg/m) according to the conversion rate eta of the fuel N into the NOx according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the experimental value of the smoke gas amount generated by each ton of garbage is 3800m3。
Preferably, in the method for predicting the source generation amount of NOx in waste incineration, in step (1), the nodes of the fuel N conversion path diagram further include gasified gas N and tar N, NH3And HCN.
Preferably, the method for predicting the source production of the waste incineration NOx comprises the following steps of:
1) and pyrolyzing the fuel N into volatile N and fixed N: the volatile component N and the fixed component N are 76-86% and 14-24% respectively. And the pyrolysis products of the volatile component N are gasification gas N and tar N, wherein the tar N can be converted into the gasification gas N again by 100%. When the gasified gas N is further pyrolyzed, 0-30% of the gasified gas N is directly converted into N230-40% of fuel N will be converted into HCN, and 40-60% of fuel N will be pyrolyzed to form NH3；
2)HCN、NH3Oxidation to NOx, N2Generation of (1): the pyrolysis product of fuel N has HCN and NH3All of the HCN is oxidized to NOx, NH3Oxidation to NOx and N2The proportion of the components is 45-65% and 35-55% respectively; since more than 95% of the N in the coke is oxidized to NOx.
3) Reduction of NOx to N2: NOx formed by oxidation may also be reduced to N286-98% of the NOx will be reduced to N2。
Preferably, in the method for predicting the source generation amount of NOx from waste incineration, in the step (3), the weight between the volatile component N node and the NOx node, that is, the conversion rate a of the volatile component N into NOx is corrected according to the principle that the larger the H/N element mass content ratio obtained in the step (2), the larger the weight between the volatile component N node and the NOx node, specifically:
determining the mass content ratio R of the H/N element1The range of the interval: (0,3]，(3,5]，(5,+∞)；
When the mass content ratio R of the H/N element1At (0, 3)]When the weight A between the volatile component N node and the NOx node is 0.52; when the mass content ratio R of the H/N element1At (3, 5)]When the weight A between the volatile component N node and the NOx node is 0.625; when the mass content ratio R of the H/N element1At (5, + ∞), the weight A between the volatile N node to the NOx node takes 0.74.
Preferably, in the method for predicting the source output of NOx generated by waste incineration, in the step (3), the larger the ratio of the fixed carbon to the combustible component obtained in the step (2) is, the higher the ratio of the fixed carbon to the combustible component is, the NOx node to N is2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2The conversion rate B of (A) is specifically:
determining the ratio R of fixed carbon to combustible2In the range interval: (0,0.10),[0.10,0.12]， (0.12,0.14]，(0.14,0.16]，(0.16,0.18]，(0.18,+∞)；
When ratio R of fixed carbon to combustible component2At (0,0.10), NOx node to N2The weight B between nodes is 0.86; when ratio R of fixed carbon to combustible component2At [0.10,0.12 ]]When NOx is noded to N2The weight B between nodes is taken to be [0.86,0.89 ]](ii) a When ratio R of fixed carbon to combustible component2Is at (0.12, 0.14)]When NOx is noded to N2The weight B between nodes is taken to be (0.89, 0.92)](ii) a When ratio R of fixed carbon to combustible component2At (0.14, 0.16)]When NOx is noded to N2The weight B between nodes is taken to be (0.92, 0.95)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When the ratio R of fixed carbon to combustible component2At (0.18, + ∞) NOx node to N2The weight B between nodes takes 0.98.
Preferably when the ratio R of fixed carbon to combustible components2At [0.10,0.12 ]]When NOx is noded to N2The weight between nodes, B, is 0.86+1.5 (R)2-0.1)。
According to another aspect of the invention, a waste incineration NOx source production amount prediction system is provided and comprises a fuel N conversion path diagram loading module, a correction module and a prediction module;
the fuel N conversion path diagram loading module is used for loading the fuel N conversion path diagram, calculating the conversion rate eta of the fuel N converted into the NOx and submitting the conversion rate eta to the prediction module; the fuel N conversion path diagram in the incineration plant is a weighted directed graph, various existing forms of N element in the incineration process in the incineration plant are taken as nodes, the conversion reaction of the N element between different existing forms is taken as an edge, and the conversion rate of the N element between different existing forms is taken as a weight; the fuel N conversion path map nodes comprise fuel N element, volatile component N, fixed component N, NOx and N2；
The correction module is used for acquiring the mass content ratio R of the H/N elements1H/n and the ratio of fixed carbon to combustible componentsValue R2Correcting the weight from the volatile component N (vol-N) node to the NOx node according to the principle that the weight from the volatile component N (vol-N) node to the NOx node is larger when the mass content ratio of the H/N element is larger, namely the conversion rate A of the volatile component N to the NOx is corrected, and the ratio of the fixed carbon to the combustible component obtained according to the step (2) is larger according to the ratio of the fixed carbon to the combustible component, namely the conversion rate A of the volatile component N to the NOx node is corrected, wherein the ratio of the fixed carbon to the combustible component is larger2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2Correcting the fuel N reforming map of the fuel N reforming map loading module; wherein H is the mass content of the H element, N is the mass content of the N element, V is the mass proportion of the volatile component, and F is the mass proportion of the fixed carbon;
the prediction module calculates a NOx generation concentration C (mg/m) based on a conversion rate eta of the fuel N into the NOx provided by the fuel N conversion map loading module according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the experimental value of the smoke gas amount generated by each ton of garbage is 3800m3。
Preferably, the system for predicting the source production of NOx in waste incineration further includes gasified gas N and tar N, NH at the nodes of the fuel N conversion path diagram3And HCN.
Preferably, in the system for predicting the source generation amount of NOx generated by refuse incineration, the fuel N conversion path diagram of the incineration plant initially loaded by the fuel N conversion path diagram loading module is obtained as follows:
1) and pyrolyzing the fuel N into volatile N and fixed N: the volatile component N and the fixed component N are 76-86% and 14-24% respectively. And the pyrolysis products of the volatile component N are gasification gas N and tar N, wherein the tar N can be converted into the gasification gas N again by 100%. 0 to c when the gasified gas N is further pyrolyzed30% direct conversion to N230-40% of fuel N will be converted into HCN, and 40-60% of fuel N will be pyrolyzed to form NH3；
2)HCN、NH3Oxidation to NOx, N2Generation of (1): the pyrolysis product of fuel N has HCN and NH3All of the HCN is oxidized to NOx, NH3Oxidation to NOx and N2The proportion of the components is 45-65% and 35-55% respectively; since more than 95% of the N in the coke is oxidized to NOx.
3) Reduction of NOx to N2: NOx formed by oxidation may also be reduced to N286-98% of the NOx will be reduced to N2。
Preferably, the system for predicting the amount of NOx generated from waste incineration comprises a correction module for correcting the weight between the volatile component N node and the NOx node, that is, the conversion rate a of the volatile component N into NOx, according to the principle that the larger the H/N element mass content ratio is, the larger the weight between the volatile component N node and the NOx node is, according to the H/N element mass content ratio, specifically:
determining the mass content ratio R of the H/N element1The range of the interval: (0,3]，(3,5]，(5,+∞)；
When the mass content ratio R of the H/N element1At (0, 3)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.52; when the mass content ratio R of the H/N element1At (3, 5)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.625; when the mass content ratio R of the H/N element1At (5, + ∞), the weight A between the volatile N (vol-N) node to the NOx node is 0.74.
Preferably, in the system for predicting the source production of NOx from waste incineration, the correction module is configured to calculate the NOx node to N according to the ratio of the fixed carbon to the combustible component and the larger the ratio of the fixed carbon to the combustible component2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2The conversion rate B of (A) is specifically:
determining the ratio R of fixed carbon to combustible2In the range interval: (0,0.10),[0.10,0.12]， (0.12,0.14]，(0.14,0.16]，(0.16,0.18]，(0.18,+∞)；
When ratio R of fixed carbon to combustible component2At (0,0.10), NOx node to N2The weight B between nodes is 0.86; when ratio R of fixed carbon to combustible component2At [0.10,0.12 ]]When NOx is noded to N2The weight B between nodes is taken to be [0.86,0.89 ]](ii) a When ratio R of fixed carbon to combustible component2Is at (0.12, 0.14)]When NOx is noded to N2The weight B between nodes is taken to be (0.89, 0.92)](ii) a When ratio R of fixed carbon to combustible component2At (0.14, 0.16)]When NOx is noded to N2The weight B between nodes is taken to be (0.92, 0.95)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When the ratio R of fixed carbon to combustible component2At (0.18, + ∞) NOx node to N2The weight B between nodes takes 0.98.
Preferably when the ratio R of fixed carbon to combustible components2At [0.10,0.12 ]]When NOx is noded to N2The weight between nodes, B, is 0.86+1.5 (R)2-0.1)。
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the invention provides a calculation method for predicting fuel N conversion rate and NOx generation amount by two key factors of element mass ratio H/N and fixed carbon content in garbage on the basis of clearing a main path of fuel N conversion in a garbage incineration plant and combining the influence of the characteristics of garbage fuel on each step in a conversion path. It should be noted that: the fuel N conversion rate predicted by the method and the corresponding NOx generation amount value range are more reliable, and the method is mainly used for analyzing the variation trend of the fuel N conversion rate.
The invention mainly solves the problems that the conversion rate of fuel N and the concentration of NOx generated can be predicted in advance through the calculation method, the denitration process and the denitration agent dosage of an incineration plant can be adjusted in a prospective manner, and the double promotion of environmental protection and economic benefit is realized.
The method and the device have more accurate prediction on the condition that the incineration plants meet the specifications of the standard for controlling pollution of household garbage incineration (GB 18485-2014) and the working condition is stable.
Drawings
FIG. 1 is a diagram of an initial fuel N conversion path of an incineration plant provided by an embodiment of the present invention;
FIG. 2 is a Pearson correlation coefficient for 10 variables according to an embodiment of the present invention;
FIG. 3 is a graph of the effect of excess air factor on fuel N conversion for an embodiment of the present invention;
FIG. 4 is a graph showing the effect of fuel N element content, H/N, O/N, on fuel N conversion for an embodiment of the present invention, where FIG. 4a is a graph relating fuel N conversion to fuel N element content and FIG. 4b is a graph relating fuel N conversion to H/N and O/N.
FIG. 5 is R1、R2Influence on the value range of the fuel N conversion rate;
FIG. 6 is a corrected fuel N conversion path diagram provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method for predicting the source generation amount of NOx generated by waste incineration, which comprises the following steps:
(1) acquiring an initial fuel N conversion path diagram of an incineration plant, wherein the fuel N conversion path diagram in the incineration plant is a weighted directed graph, various existing forms of N element in the incineration process of the incineration plant are taken as nodes, the conversion reaction of the N element between different existing forms is taken as an edge, and the conversion rate of the N element between different existing forms is taken as a weight; the Fuel N conversion path diagram nodes comprise Fuel N element (Fuel-N) and volatile component N (v)ol-N), fixed component N (char-N), NOx, and N2(ii) a Preferably comprises gasification gas N (gas-N), tar N (tar-N), NH3、HCN；
Preferably, the initial fuel N conversion path map of the incineration plant is obtained as follows:
1) the fuel N is pyrolyzed into volatile component N and fixed component N. The volatile component N and the fixed component N are 76-86% and 14-24% respectively. And the pyrolysis products of the volatile component N are gasification gas N and tar N, wherein the tar N can be converted into the gasification gas N again by 100%. When the gasified gas N is further pyrolyzed, about 0-30% of the gasified gas N is directly converted into N2. However, under the action of water molecules in the wet flue gas, only 30-40% of fuel N is converted into HCN, and 40-60% of fuel N is pyrolyzed to generate NH3
2)HCN、NH3Oxidation to NOx, N2And (4) generating. The pyrolysis product of fuel N has HCN and NH3All of the HCN is oxidized to NOx, NH3Oxidation to NOx and N2The proportion of (A) is 45-65% and 35-55% respectively. In addition, more than 95% of the N in the coke is oxidized to NOx.
3) Reduction of NOx to N2. NOx formed by oxidation may also be reduced to N2About 86-98% of the NOx will be reduced to N again2。
(2) Detecting the element components and industrialized analytical components of the received base garbage, and calculating the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2F/(V + F); wherein H is the mass content of the H element, N is the mass content of the N element, V is the mass proportion of volatile components, and F is the mass proportion of fixed carbon;
(3) correcting the weight from the volatile component N (vol-N) node to the NOx node according to the principle that the weight from the volatile component N (vol-N) node to the NOx node is larger when the H/N element mass content ratio obtained in the step (2) is larger, namely the weight from the volatile component N (vol-N) node to the NOx node is larger, and according to the ratio of the fixed carbon to the combustible component obtained in the step (2), the weight from the volatile component N node to the NOx node is larger when the ratio of the fixed carbon to the combustible component is larger2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. NOx conversionTo be N2Obtaining a corrected fuel N reforming path diagram;
correcting the weight between the volatile component N (vol-N) node and the NOx node, namely the conversion rate A of the volatile component N into the NOx according to the principle that the weight between the volatile component N (vol-N) node and the NOx node is larger when the mass content ratio of the H/N element obtained in the step (2) is larger, specifically:
determining the mass content ratio R of the H/N element1The range of the interval: (0,3]，(3,5]，(5,+∞)；
When the mass content ratio R of the H/N element1At (0, 3)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.52; when the mass content ratio R of the H/N element1At (3, 5)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.625; when the mass content ratio R of the H/N element1At (5, + ∞), the weight A between the volatile N (vol-N) node to the NOx node is 0.74.
The ratio of the fixed carbon to the combustible component obtained according to the step (2) is from the NOx node to N according to the larger ratio of the fixed carbon to the combustible component2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2The conversion rate B of (A) is specifically:
determining the ratio R of fixed carbon to combustible2In the range interval: (0,0.10),[0.10,0.12]， (0.12,0.14]，(0.14,0.16]，(0.16,0.18]，(0.18,+∞)；
When ratio R of fixed carbon to combustible component2At (0,0.10), NOx node to N2The weight B between nodes is 0.86; when ratio R of fixed carbon to combustible component2At [0.10,0.12 ]]When NOx is noded to N2The weight B between nodes is taken to be [0.86,0.89 ]](ii) a When ratio R of fixed carbon to combustible component2Is at (0.12, 0.14)]When NOx is noded to N2The weight B between nodes is taken to be (0.89, 0.92)](ii) a When ratio R of fixed carbon to combustible component2At (0.14, 0.16)]When NOx is noded to N2The weight B between nodes is taken to be (0.92, 0.95)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0).18]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When the ratio R of fixed carbon to combustible component2At (0.18, + ∞) NOx node to N2The weight B between nodes takes 0.98.
Preferably when the ratio R of fixed carbon to combustible components2At [0.10,0.12 ]]When NOx is noded to N2The weight between nodes, B, is 0.86+1.5 (R)2-0.1)。
(4) Calculating a conversion rate eta of the fuel N into the NOx according to the fuel N conversion path diagram obtained in the step (3), and calculating a NOx generation concentration C (mg/m) according to the conversion rate eta of the fuel N into the NOx according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the experimental value of the smoke gas amount generated by each ton of garbage is 3800m3。
The invention provides a waste incineration NOx source output prediction system which comprises a fuel N conversion path diagram loading module, a correction module and a prediction module;
the fuel N conversion path diagram loading module is used for loading the fuel N conversion path diagram, calculating the conversion rate eta of the fuel N converted into the NOx and submitting the conversion rate eta to the prediction module;
the correction module is used for acquiring the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2Correcting the weight from the volatile component N (vol-N) node to the NOx node according to the principle that the weight from the volatile component N (vol-N) node to the NOx node is larger when the mass content ratio of the H/N element is larger, namely the conversion rate A of the volatile component N to the NOx is corrected, and the ratio of the fixed carbon to the combustible component obtained according to the step (2) is larger according to the ratio of the fixed carbon to the combustible component, namely the conversion rate A of the volatile component N to the NOx node is corrected, wherein the ratio of the fixed carbon to the combustible component is larger2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2Correcting the fuel N reforming map of the fuel N reforming map loading module;
the prediction module calculates a NOx generation concentration C (mg/m) based on a conversion rate eta of the fuel N into the NOx provided by the fuel N conversion map loading module according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the experimental value of the smoke gas amount generated by each ton of garbage is 3800m3。
The following are examples:
a method for predicting the source generation amount of NOx generated by waste incineration comprises the following steps:
(1) acquiring an initial fuel N conversion path diagram of an incineration plant, wherein the fuel N conversion path diagram in the incineration plant is a weighted directed graph, as shown in FIG. 1, various existing forms of N element in the incineration process of the incineration plant are taken as nodes, conversion reaction of the N element between different existing forms is taken as an edge, and the conversion rate of the N element between different existing forms is taken as a weight; the Fuel N conversion path map nodes comprise Fuel N element (Fuel-N), volatile component N (vol-N), fixed component N (char-N), NOx, and N2(ii) a Preferably comprises gasification gas N (gas-N), tar N (tar-N) and NH3、HCN；
The initial fuel N conversion path diagram of the incineration plant is obtained according to the following method:
1) the fuel N is pyrolyzed into volatile component N and fixed component N. The content of volatile component N and the content of fixed component N in the combustible components of the household garbage are 76-86% and 14-24% respectively. The pyrolysis products of the volatile component N are generally gasification gas N and tar N, but under the high-temperature and high-humidity conditions of an incineration plant, the tar N is basically and completely pyrolyzed into the gasification gas N, so that the proportion of the tar N converted into the gasification gas N is 100%.
During the further pyrolysis reaction of the gasification gas N, except for the conversion of most of the gasification gas N into HCN and NH3Also, about 0 to 30% of the nitrogen is directly converted into N2. Conversion of gasified gas N into N2The ratio of (a) depends on the elemental composition: the higher the mass content of N element or the smaller the H/N, O/N element ratio, the gasification gas N is converted into N2The larger the proportion of (c). Kitchen waste components in the household garbage contain more protein, more heterocyclic pyrrole nitrogen and pyridine nitrogen can be generated, HCN can be converted more easily, only 30-40% of fuel N can be converted into HCN under the action of water molecules in wet flue gas, and 40-60% of fuel N can be pyrolyzed to generate NH3。
2)HCN、NH3Oxidation to NOx, N2And (4) generating. The major products of HCN oxidation are NOx (see reactions 1 and 2 in Table 1), and NH3The main products of oxidation are NOx and N2(see reactions 3 and 4 in Table 1). Reaction 4 has a reaction rate of about 390 times that of reaction 3 at 850 ℃, but the enthalpy change of reaction 4 is about 1.5 times that of reaction 3, so the strength of competition of reactions 3 and 4 is mainly affected by the catalyst (coke), and NH is determined3Oxidation to NOx and N2The proportion of (A) is 45-65% and 35-55% respectively. In addition, the N conversion rate of the coke is more than 95 percent because the N in the coke and the coke are simultaneously oxidized and transferred into the smoke and the hot ignition loss rate of the slag burned by the household garbage is less than 5 percent.
3) Reduction of NOx to N2. NOx formed by oxidation may also be reduced to N2The main reducing agent comprises oxidation products CNOx of HCN and NH not participating in oxidation3With CO and CH4The main reactions of the gasified gas and coke are shown as reactions 5-9 in Table 1, and 86-98% of NOx is reduced to N again2Namely, the final residual NOx is only 2-14% of NOx generated by oxidation. This stage is a key step affecting fuel N conversion, and SNCR denitration and SCR denitration actually enhance this reduction process by an exogenous reductant.
TABLE 1 HCN and NH3Oxidation and reduction of NOx
The components of the domestic garbage, the element mass content of the domestic garbage, the NOx generation concentration, the relevant working conditions and the fuel N conversion rate of 8 incineration plants and 14 incineration plants are selected as shown in the table 2. Fuel N conversion refers to the ratio between the actual final amount of NOx produced and the theoretical amount of total fuel N converted to NOx.
TABLE 2 Fuel N conversion and its possible influencing factors
The data are collated as shown in table 2, the main working condition variables comprise furnace temperature (T) and excess air coefficient (EA), the main fuel characteristic variables comprise moisture content (Moi), volatile content (Vol), fixed carbon content (Fix), percentage (R) of fixed carbon in combustible components, wet-based N element mass content (N), dry-based H-to-N element mass ratio (H/N), dry-based O-to-N element mass ratio (O/N), and fuel N conversion rate (η) is taken as a dependent variable. Pearson correlation analysis was performed on the above 10 variables, and the results are shown in fig. 2:
1. the correlation between the furnace temperature and the fuel N conversion rate is small (rho)s0.47) because the reaction temperature and residence time in the waste incinerator can ensure sufficient pyrolysis of fuel N. The solid fuel N can be completely pyrolyzed within 10min, the fuel N in the flue gas can completely react after staying for 1.7s at 800 ℃, and the staying time of the garbage materials and the flue gas in the practical engineering of domestic garbage incineration is generally longer than the shortest staying time proposed by the literature. Therefore, it is considered that both the volatile component N and the fixed component N in the refuse fuel migrate into the gas phase through the pyrolysis process, thereby impairing the correlation with the furnace temperature.
2. Coefficient of excess air andthe correlation of fuel N conversion is weak (ρ)s0.13) because the garbage characteristics of different incineration plants are different greatly, and the inter-group variance and the intra-group variance interfere with each other after data summarization. For example, the content of fixed carbon in the waste of the incineration plant G is 1.5 to 2.0 times that of other incineration plants, and H/N, O/N is 0.17 to 0.41 times and 0.17 to 0.51 times that of other incineration plants respectively. In fact, for the data of a single incineration plant (for example, the B, G, H plant in fig. 3), the larger the excess air factor, the larger the oxygen supply in the oxidation stage, and the more HCN and NH3Oxidation to NOx results in an increase in fuel N conversion of about 0.5%. However, since the excess air ratio determines the stability of combustion and varies with the calorific value of the waste fuel in actual works, it is difficult to control the generation of NOx from the source by adjusting the excess air ratio.
Referring to fig. 2, it can be seen that the influence of the characteristics of the waste industry on the N conversion rate of fuel is reflected in:
1) the fuel N conversion has a negative correlation (rho) with the fixed fractional N (char-N) contents-0.76, -0.71) without significant correlation with volatiles (p)s-0.04). Mainly because the pyrolysis, oxidation and reduction of fuel N in the gas phase are mainly determined by temperature, oxygen concentration and degree of mixing of gases, and have little correlation with volatile content, but the fixed carbon content directly affects the contact area of the gas-solid phase and the number of carbon active sites, affecting the reduction efficiency of NOx.
2) The correlation between the water content of the garbage and the N conversion rate of the fuel is weak (rho)s-0.16), primarily because the waste water cut is so high that its effect on fuel N conversion has reached a threshold. In Table 2, the water content of the garbage is 42.06-55.32%, and in combination with the characteristics of the Chinese domestic garbage, each ton of garbage is burnt to generate 3817m3Marking dry flue gas, and assuming that all water in the garbage enters the flue gas, generating water vapor 523.4-688.4 m for each ton of garbage3Therefore, the moisture content of the wet flue gas is about 12.03-15.28%. Water molecules can generate a large amount of H free radicals under the high-temperature condition to generate NH through hydrogenation reaction with HCN3And reacting with coke to produce CO and H2Can enhance the smoke returnHowever, when the water content is more than 10%, the concentration of HCN and coke is not enough to continuously enhance the reaction, so that the effect is not obvious.
Combining fig. 2 and fig. 4, it can be known that there is a strong correlation between the mass content of the waste elements and the fuel N conversion rate:
the fuel N conversion rate in the refuse raw material of the incineration plant has strong negative correlation (rho) with the mass content of N elementsStrong positive correlation exists between H/N, O/N (rho-0.73)s0.84, 0.82). FIGS. 4a and b are graphs of fuel N conversion rate versus N element mass content and H/N, O/N, respectively. It can be seen that fuel N conversion decreases with increasing elemental N content and increases with increasing H/N, O/N. The main reasons are: during pyrolysis of fuel N, higher N mass content results in higher N content in the pyrolysis product of fuel N2Thereby reducing fuel N conversion; the H elements are main intermediate products HCN and NH3The formed essential elements, higher H element concentration can increase HCN and NH to a certain extent3Yield of, decrease of N2Yield, increasing fuel N conversion; in HCN and NH3The conversion to NOx can be achieved without the involvement of elemental O, and higher elemental O concentrations also increase fuel N conversion.
By combining the above analysis of the influence factors on the fuel N conversion in the actual working conditions of the waste incineration, the quantitative conversion path of the initialized fuel N is determined on the basis of the existing fuel N qualitative conversion path according to the typical range of the fuel characteristics of the household garbage, as shown in FIG. 1.
(2) Detecting the element components and industrialized analytical components of the received base garbage, and calculating the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2F/(V + F); wherein H is the mass content of the H element, N is the mass content of the N element, V is the mass proportion of the volatile component, and the mass proportion of the fixed carbon is F;
(3) correcting the mass content ratio of the elements H/N obtained in the step (2) according to the principle that the larger the mass content ratio of the elements H/N, the larger the weight between a volatile component N (vol-N) node and a NOx nodeDistributing the weight from the node of N (vol-N) to the node of NOx, namely the conversion rate A of the volatile component N converted into NOx, and obtaining the ratio of the fixed carbon to the combustible component according to the step (2) and changing the ratio of the NOx node to the node of N according to the larger ratio of the fixed carbon to the combustible component2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2Obtaining a corrected fuel N reforming path diagram;
correcting the weight between the volatile component N (vol-N) node and the NOx node, namely the conversion rate A of the volatile component N into the NOx according to the principle that the weight between the volatile component N (vol-N) node and the NOx node is larger when the mass content ratio of the H/N element obtained in the step (2) is larger, specifically:
determining the mass content ratio R of the H/N element1The range of the interval: (0,3]，(3,5]，(5,+∞)；
When the mass content ratio R of the H/N element1At (0, 3)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.52; when the mass content ratio R of the H/N element1At (3, 5)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.625; when the mass content ratio R of the H/N element1At (5, + ∞), the weight A between the volatile N (vol-N) node to the NOx node is 0.74.
According to the ratio of the fixed carbon to the combustible component obtained in the step (2), the NOx node is increased to N according to the larger ratio of the fixed carbon to the combustible component2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2The conversion rate B of (A) is specifically:
determining the ratio R of fixed carbon to combustible2In the range interval: (0,0.10),[0.10,0.12]， (0.12,0.14]，(0.14,0.16]，(0.16,0.18]，(0.18,+∞)；
When ratio R of fixed carbon to combustible component2At (0,0.10), NOx node to N2The weight B between nodes is 0.86; when ratio R of fixed carbon to combustible component2At [0.10,0.12 ]]When NOx is noded to N2The weight B between nodes is taken to be [0.86,0.89 ]](ii) a When carbon is fixed withRatio of fuel fractions R2Is at (0.12, 0.14)]When NOx is noded to N2The weight B between nodes is taken to be (0.89, 0.92)](ii) a When ratio R of fixed carbon to combustible component2At (0.14, 0.16)]When NOx is noded to N2The weight B between nodes is taken to be (0.92, 0.95)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When the ratio R of fixed carbon to combustible component2At (0.18, + ∞) NOx node to N2The weight B between nodes takes 0.98.
Preferably when the ratio R of fixed carbon to combustible components2At [0.10,0.12 ]]When NOx is noded to N2The weight between nodes, B, is 0.86+1.5 (R)2-0.1). The NOx generation concentration calculated at this time may be used as a reference value.
Analysis in conjunction with FIGS. 1 and 4 finds independent variables, R respectively, that have a significant effect on fuel N conversion in a waste incineration plant1And R2Where H/N is a representation of the effect of the elemental mass content of the fuel on the N conversion of the fuel, R2As a representative of the effect of fixed carbon content in the fuel on fuel N conversion (R)2The effect of abnormal values of moisture and ash can be circumvented compared to fixed carbon content). R1Mainly influences the pyrolysis product N of gasified gas N2HCN and NH3In a ratio of R to R2Mainly affecting the reduction efficiency of NOx. R is to be1The method comprises three grades of low, medium and high, wherein the H/N value is 1-7, the pyrolysis product corresponding to each grade is represented by a typical value, and as shown in Table 3, when the H/N is not in the interval, the N can be calculated according to the closest grade2HCN and NH3The distribution ratio of (c).
TABLE 3R1Element ratio and pyrolysis product correspondence table
And (3) fitting data to display: at R2When the NOx reduction efficiency is between 10 and 18%, the NOx reduction efficiency is uniformly changed between 86 and 98%, so that the char content is divided into four grades, 10 to 12%, 12 to 14%, 14 to 16%, and 16 to 18%, respectively, corresponding to the NOx reduction efficiency, 86 to 89%, 89 to 92%, 92 to 95%, and 95 to 98%. When the char content is below 10% or above 18%, it can be calculated as the lowest and highest reduction efficiencies, respectively. And because the conversion rate of the N element in the fixed carbon is obviously greater than that of the N element in the volatile component in the primary NOx generation process, namely R2Positive correlation with the primary generation of NOx on the one hand and positive correlation with the reduction of NOx on the other hand, has an adverse effect on the fuel N conversion.
According to the above for R1、R2The interval definition of (2) can divide the fuel N conversion rate under the control of two factors into 12 intervals shown in fig. 5. Overall, fuel N conversion is a function of R1Is increased with increasing R2Increasing and decreasing, but in each interval the fuel N conversion is dependent on R1And increased by increasing. The corrected fuel N conversion map is shown in fig. 6.
(4) Calculating a conversion rate eta of the fuel N into the NOx according to the fuel N conversion path diagram obtained in the step (3), and calculating a NOx generation concentration C (mg/m) according to the conversion rate eta of the fuel N into the NOx according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the experimental value of the smoke gas amount generated by each ton of garbage is 3800m3。
R of incineration plant of this example 81And R2Substituting into the prediction NOx production range in figure 6, the accuracy reaches 75%, and the accuracy is good, and take 4 of them incineration plants as an example, specifically as follows:
the mass content H of H element in the incineration plant (1): 2.56% of N elementThe content n is as follows: 0.55%, volatile content v: 39.21%, fixed carbon content f: 6.55%, R1：4.65，R2：0.1432。
Determination of R1In the interval of (3, 5)]，A＝0.625；R2In the interval of (0.14, 0.16)]And B has a value in the range of (0.92, 0.95)]。
Therefore, the value range of the fuel N conversion rate eta can be calculated to be (0.0336, 0.0537)]The corresponding NOx generation concentration is (160,255)]mg/m3The reference NOx generation concentration is 240mg/m3。
And (3) the mass content H of the H element in the incineration plant (2): 2.76%, and the mass content N of N element: 0.42%, volatile content v: 41.49%, fixed carbon content f: 6.49%, R1：6.57，R2：0.1353。
Determination of R1In the interval of (5, 7)]，A＝0.74；R2In the interval of (0.12, 0.14)]And B has a value in the range of (0.89, 0.92)]。
The value range of the fuel N conversion rate eta can be calculated to be (0.0384, 0.0615)]The corresponding NOx generation concentration is (140,223)]mg/m3The reference NOx generation concentration is 243mg/m3。
And (3) the mass content H of the H element: 1.70 percent, and the mass content of N element N: 1.46%, volatile content v: 39.21%, fixed carbon content f: 10.50%, R1：1.16，R2：0.2112。
Determination of R1The interval is (1, 3)]，A＝0.52；R2Greater than 0.18 and B is 0.98.
From this, it was calculated that the fuel N conversion η was 0.0122 and the corresponding NOx generation concentration was 143mg/m3。
H element mass content H of incineration plant (4): 4.07%, and the mass content N of N element: 1.35%, volatile content v: 35.8%, fixed carbon content f: 6.68% of R1：3.01，R2：0.1572。
Determination of R1In the interval of (3, 5)]，A＝0.625；R2In the interval of (0.14, 0.16)]And B has a value in the range of (0.92, 0.95)]。
From this, fuel N conversion can be calculatedEta is in the range of (0.0338, 0.0541)]The corresponding NOx generation concentration is (395,631)]mg/m3The reference NOx generation concentration is 428mg/m3。
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for predicting the source output of NOx generated by waste incineration is characterized by comprising the following steps:
(1) acquiring an initial fuel N conversion path diagram of an incineration plant, wherein the fuel N conversion path diagram in the incineration plant is a weighted directed graph, various existing forms of N element in the incineration process of the incineration plant are taken as nodes, the conversion reaction of the N element between different existing forms is taken as an edge, and the conversion rate of the N element between different existing forms is taken as a weight; the fuel N conversion path map nodes comprise fuel N element, volatile component N, fixed component N, NOx and N2；
(2) Detecting the element components and industrialized analytical components of the received base garbage, and calculating the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2F/(V + F); wherein H is the mass content of the H element, N is the mass content of the N element, V is the mass proportion of the volatile components, and F is the mass proportion of the fixed carbon;
(3) correcting the weight from the volatile component N node to the NOx node according to the H/N element mass content ratio obtained in the step (2) according to the principle that the larger the H/N element mass content ratio is, the larger the weight from the volatile component N node to the NOx node is, namely, the conversion rate A of converting the volatile component N into the NOx is corrected, and according to the ratio of the fixed carbon to the combustible component obtained in the step (2), the larger the ratio of the fixed carbon to the combustible component is, the higher the conversion rate A of the volatile component N into the NOx is2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2Obtaining a corrected fuel N reforming path diagram;
(4) combustion obtained according to step (3)A fuel N conversion path diagram, calculating the conversion rate eta of the fuel N to the NOx, and calculating the NOx generation concentration C (mg/m) according to the conversion rate eta of the fuel N to the NOx according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the measured flue gas amount of each ton of garbage is 3800m3。
2. The method for predicting the source generation amount of NOx generated by refuse incineration according to claim 1, wherein the node of the fuel N conversion path diagram in the step (1) further includes gasified gas N and tar N, NH3And HCN.
3. The method for predicting the source generation amount of NOx generated by refuse incineration according to claim 1, wherein the initial fuel N conversion path map of the incineration plant is obtained as follows:
1) and pyrolyzing the fuel N into volatile N and fixed N: the volatile component N and the fixed component N are 76-86% and 14-24% respectively. And the pyrolysis products of the volatile component N are gasification gas N and tar N, wherein the tar N can be converted into the gasification gas N again by 100%. When the gasified gas N is subjected to further pyrolysis reaction, 0-30% of the gasified gas N is directly converted into N230-40% of fuel N will be converted into HCN, and 40-60% of fuel N will be pyrolyzed to form NH3；
2)HCN、NH3Oxidation to NOx, N2Generation of (1): the pyrolysis product of fuel N has HCN and NH3All of the HCN is oxidized to NOx, NH3Oxidation to NOx and N2The proportion of the components is 45-65% and 35-55% respectively; since more than 95% of the N in the coke is oxidized to NOx.
3) Reduction of NOx to N2: NOx formed by oxidation may also be reduced to N286-98% of the NOx will be reduced to N2。
4. The method for predicting the source generation amount of NOx generated by incinerating refuse according to claim 1, wherein the step (3) corrects the conversion rate a of the weight of the volatile component N to the NOx node, that is, the conversion rate a of the volatile component N to NOx, according to the principle that the larger the mass content ratio of the H/N element obtained in the step (2), the larger the weight of the volatile component N to the NOx node, specifically:
determining the mass content ratio R of the H/N element1The range of the interval: (0,3]，(3,5]，(5,+∞)；
When the mass content ratio R of the H/N element1At (0, 3)]When the weight A between the volatile component N node and the NOx node is 0.52; when the mass content ratio R of the H/N element1At (3, 5)]When the volatile matter N node reaches the NOx node, the weight A between the volatile matter N node and the NOx node is 0.625; when the mass content ratio R of the H/N element1At (5, + ∞), the weight A between the volatile N node to the NOx node takes 0.74.
5. The method for predicting the source output of NOx generated by incinerating refuse according to claim 1, wherein in the step (3), the ratio of the fixed carbon to the combustible component obtained in the step (2) is increased according to the ratio of the fixed carbon to the combustible component, and the NOx node is increased to N2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2The conversion rate B of (A) is specifically:
determining the ratio R of fixed carbon to combustible2In the range interval: (0,0.10),[0.10,0.12]，(0.12,0.14]，(0.14,0.16]，(0.16,0.18]，(0.18,+∞)；
When ratio R of fixed carbon to combustible component2At (0,0.10), NOx node to N2The weight B between nodes is 0.86; when ratio R of fixed carbon to combustible component2At [0.10,0.12 ]]When NOx is noded to N2The weight B between nodes is taken to be [0.86,0.89 ]](ii) a When ratio R of fixed carbon to combustible component2Is at (0.12, 0.14)]When NOx is noded to N2The weight B between nodes is taken to be (0.89, 0.92)](ii) a When ratio R of fixed carbon to combustible component2At (0.14, 0.16)]Time, NOx festivalPoint to N2The weight B between nodes is taken to be (0.92, 0.95)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.18, + ∞) NOx node to N2The weight B between nodes takes 0.98.
Preferably when the ratio R of fixed carbon to combustible components2At [0.10,0.12 ]]When NOx is noded to N2The weight between nodes, B, is 0.86+1.5 (R)2-0.1)。
6. A waste incineration NOx source production prediction system is characterized by comprising a fuel N conversion path diagram loading module, a correction module and a prediction module;
the fuel N conversion path diagram loading module is used for loading the fuel N conversion path diagram, calculating the conversion rate eta of the fuel N converted into the NOx and submitting the conversion rate eta to the prediction module; the fuel N conversion path diagram in the incineration plant is a weighted directed graph, various existing forms of N element in the incineration process in the incineration plant are taken as nodes, the conversion reaction of the N element between different existing forms is taken as an edge, and the conversion rate of the N element between different existing forms is taken as a weight; the fuel N conversion path map nodes comprise fuel N element, volatile component N, fixed component N, NOx and N2；
The correction module is used for acquiring the mass content ratio R of the H/N elements1H/n and the ratio R of fixed carbon to combustible2Correcting the weight from the volatile component N (vol-N) node to the NOx node according to the principle that the weight from the volatile component N (vol-N) node to the NOx node is larger when the mass content ratio of the H/N element is larger, namely the conversion rate A of the volatile component N to the NOx is corrected, and obtaining the ratio of the fixed carbon to the combustible component according to the step (2) and obtaining the ratio of the fixed carbon to the combustible component according to the ratio of the fixed carbon to the combustible component which is larger when the ratio of the NOx node to the N is corrected2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2Correcting the fuel N reforming map of the fuel N reforming map loading module; wherein H is the mass content of the H element, N is the mass content of the N element, V is the mass proportion of the volatile components, and F is the mass proportion of the fixed carbon;
the prediction module calculates a NOx generation concentration C (mg/m) based on a conversion rate eta of the fuel N into the NOx provided by the fuel N conversion map loading module according to the following formula3)：
Wherein, N is the mass content (%) of fuel N; m (NOx) is the relative molecular mass of NOx and takes the value of 46; m (N) is the mass fraction of the N element, and the value is 14; the measured flue gas amount of each ton of garbage is 3800m3。
7. The msw incineration NOx source generation prediction system of claim 6, wherein the fuel N conversion path diagram nodes further include gasification gas N, tar N, NH3And HCN.
8. The msw incineration NOx source throughput prediction system of claim 6, wherein the fuel N conversion map of the incineration plant initially loaded by the fuel N conversion map loading module is obtained as follows:
1) and pyrolyzing the fuel N into volatile N and fixed N: the volatile component N and the fixed component N are 76-86% and 14-24% respectively. And the pyrolysis products of the volatile component N are gasification gas N and tar N, wherein the tar N can be converted into the gasification gas N again by 100%. When the gasified gas N is subjected to further pyrolysis reaction, 0-30% of the gasified gas N is directly converted into N230-40% of fuel N will be converted into HCN, and 40-60% of fuel N will be pyrolyzed to form NH3；
2)HCN、NH3Oxidation to NOx, N2Generation of (1): the pyrolysis product of fuel N has HCN and NH3All of the HCN is oxidized to NOx, NH3Oxidation to NOx and N2The proportion of the components is 45-65% and 35-55% respectively; since more than 95% of the N in the coke is oxidized to NOx.
3) Reduction of NOx to N2: NOx formed by oxidation may also be reduced to N286-98% of the NOx will be reduced to N2。
9. The system for predicting the source generation amount of NOx generated by incinerating refuse according to claim 6, wherein the correction module corrects the weight between the volatile component N node and the NOx node, that is, the conversion rate a of the volatile component N into NOx according to the principle that the larger the mass content ratio of the H/N element, the larger the weight between the volatile component N node and the NOx node, specifically:
determining the mass content ratio R of the H/N element1The range of the interval: (0,3]，(3,5]，(5,+∞)；
When the mass content ratio R of the H/N element1At (0, 3)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.52; when the mass content ratio R of the H/N element1At (3, 5)]When the weight A between the volatile component N (vol-N) node and the NOx node is 0.625; when the mass content ratio R of the H/N element1At (5, + ∞), the weight A between the volatile N (vol-N) node to the NOx node is taken to be 0.74.
10. The msw incineration NOx source capacity prediction system of claim 6, wherein the correction module calculates the NOx node to N based on the ratio of fixed carbon to combustible components based on the greater the ratio of fixed carbon to combustible components2Correcting NOx nodes to N on the basis of greater weight between nodes2Weight between nodes, i.e. conversion of NOx to N2The conversion rate B of (A) is specifically:
determining the ratio R of fixed carbon to combustible2In the range interval: (0,0.10),[0.10,0.12]，(0.12,0.14]，(0.14,0.16]，(0.16,0.18]，(0.18,+∞)；
When ratio R of fixed carbon to combustible component2At (0,0.10), NOx node to N2The weight B between nodes is 0.86; when ratio of fixed carbon to combustible componentR2At [0.10,0.12 ]]When NOx is noded to N2The weight B between nodes is taken to be [0.86,0.89 ]](ii) a When ratio R of fixed carbon to combustible component2Is at (0.12, 0.14)]When NOx is noded to N2The weight B between nodes is taken to be (0.89, 0.92)](ii) a When ratio R of fixed carbon to combustible component2At (0.14, 0.16)]When NOx is noded to N2The weight B between nodes is taken to be (0.92, 0.95)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.16, 0.18)]When NOx is noded to N2The weight B between nodes is taken to be (0.95, 0.98)](ii) a When ratio R of fixed carbon to combustible component2At (0.18, + ∞) NOx node to N2The weight B between nodes takes 0.98.
Preferably when the ratio R of fixed carbon to combustible components2At [0.10,0.12 ]]When NOx is noded to N2The weight between nodes, B, is 0.86+1.5 (R)2-0.1)。
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