TWI711484B - Nitrogen oxide emission reduction method for flue gas generated by combustion furnace - Google Patents

Abstract

The present invention aims to disclose a nitrogen oxide emission reduction method for flue gas generated by a combustion furnace, which uses a processor to obtain the first flue gas generated by the combustion furnace through combustion processing to determine the nitrogen oxide concentration in the first flue gas. In this way, the first control device is controlled to adjust the flow of the first flue gas through the heat storage chamber and the reformer, and part of the first flue gas is recovered, recombined and reused in the combustion furnace for combustion, and the emission of the first flue gas to the outside is reduced. Environmental pollution caused by.

Description

Nitrogen oxide emission reduction method for flue gas generated by combustion furnace

The present invention relates to an emission reduction method, and particularly refers to a method for controlling the concentration of nitrogen oxides in the flue gas generated by a combustion furnace to meet a standard.

The conventional combustion furnace is matched with a pair of regenerative burners to perform combustion processing. At least one workpiece is carried by a trolley and moved to a combustion chamber of the combustion furnace to be placed, and then the regenerative burner burns flames in the combustion chamber. The heating in the combustion chamber causes the workpiece to be heated for processing.

During the processing process, combustion-supporting air is injected into the regenerative burner, and then passes through the regenerator and combustion chamber in sequence, and then a fuel gas source (such as natural gas) is injected into the combustion chamber and mixed with the combustion-supporting air to use an ignition device to burn the mixed gas. Here, the combustion process is performed in the combustion furnace. Thereafter, the gas burned in the combustion furnace forms high-temperature exhaust gas, which is then discharged through the exhaust port of another regenerative burner, where a pair of regenerative burners are used to match the cycle operation of the combustion furnace.

In the previous paragraph, the above-mentioned high-temperature exhaust gas is high-temperature gas containing nitrogen oxides. In order to avoid the pollution of the environment caused by the combustion of industrial equipment, countries all over the world have set very strict emission standards. With the rise of environmental awareness and government policy advocacy, the future emission regulations for high-temperature exhaust gas will only become more stringent. Check, after the conventional high-temperature exhaust gas is transported to the thermal storage chamber of the regenerative burner, the high-temperature exhaust gas needs to be processed through other equipment until the high-temperature exhaust gas meets the emission standard value. Therefore, how to reduce the concentration of nitrogen oxides in high-temperature exhaust gas to comply with regulations and standards for processing workpieces with industrial combustion furnaces has become a very important issue.

In addition, the application of high-temperature exhaust gas at this stage only has the function of accumulating heat in the regenerator chamber that flows through the regenerative combustor, and no technical means to connect the high-temperature exhaust gas to other equipment for reuse exist. Therefore, the reuse rate of high-temperature exhaust gas is not high, and other equipment needs to be added at the same time. In addition, the time cost for post-treatment of high-temperature exhaust gas shows that the use of high-temperature exhaust gas is still unsatisfactory.

For this reason, the inventor of the present invention made improvements in view of the above-derived problems, and started to develop solutions with the idea of inventing improvements. After many years of thinking, the combustion furnace of the present invention generates flue gas to reduce nitrogen oxides. Arrangement methods are produced to serve the public and promote the development of this industry.

An object of the present invention is to provide a method for reducing nitrogen oxides in flue gas generated by a combustion furnace. When it is determined that the concentration of nitrogen oxides in the first flue gas is too high, the flow of the first flue gas through the heat storage chamber and the reformer can be controlled by , In order to reduce the emission of nitrogen oxides, and the first flue gas is reprocessed and used, so as to reduce the subsequent equipment cost and time cost for the additional treatment of the first flue gas.

An object of the present invention is to provide a method for reducing nitrogen oxides in flue gas generated by a combustion furnace, which uses the first mixed gas to participate in combustion in the combustion furnace, and the chemical components contained in the first mixed gas hinder the combustion reaction and reduce the combustion temperature , Support combustion, reduce the generation of intermediate products, and effectively reduce the generation of nitrogen oxides in the flue gas.

In order to achieve the aforementioned objectives and effects, the present invention discloses a method for reducing nitrogen oxides in flue gas generated by a combustion furnace. A combustion furnace is connected to a control device through a first flow path, and the control device is passed through a second flow path. Connected to a regenerator and a recombiner via a third flow path, the combustion furnace delivers a fuel gas through a fuel pipeline for combustion, and generates a first flue gas from the first flow path to the control device , The steps include: A processor obtains a nitrogen oxide concentration of the first flue gas in the first flow path, calculates and generates a first flow parameter and a second flow parameter, and transmits the first flow parameter and the second flow parameter To the control device; The control device adjusts the flow rate of the first flue gas flowing from the second flow path through the heat storage chamber according to the first flow parameter, and adjusts the first flue gas flowing through the third flow path according to the second flow parameter The flow rate of the reformer, the sum of the flow rate of the first flue gas flowing through the second flow channel and the third flow channel is equal to the flow rate of the first flue gas flowing from the first flow channel through the control device; The reformer receives the first flue gas and transforms it into a first recombined gas; The reformer is connected to the fuel pipeline via a fourth flow path, and the first recombined gas is delivered to the fuel pipeline and mixed with the fuel gas to form a first mixed gas; and The fuel pipeline transports the first mixed gas to the combustion furnace for combustion.

In order to enable your reviewer to have a further understanding and understanding of the features of the present invention and the effects achieved, only the examples and detailed explanations are provided, as follows:

Hereinafter, various embodiments of the present invention will be illustrated by the drawings to describe the present invention in detail; however, the concept of the present invention may be embodied in many different forms, and should not be construed as being limited to the exemplary form set forth herein. Examples.

Here, the process steps executed by the first embodiment of the present invention are described. Please refer to the first figure, which is a flowchart of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the first embodiment of the present invention. As shown in the figure, in the first embodiment of the present invention, a combustion furnace generates flue gas nitrogen oxide emission reduction method, a combustion furnace is connected to a control device through a first flow path, and the control device is connected to a second flow path The regenerator is connected to a recombiner via a third flow path. The combustion furnace delivers a fuel gas through a fuel pipeline for combustion, and generates a first flue gas from the first flow path to the control device. It includes the following steps: Step S10: A processor obtains a nitrogen oxide concentration of the first flue gas in the first flow channel, calculates and generates a first flow parameter and a second flow parameter, and combines the first flow parameter and the second flow parameter The flow parameters are transmitted to the control device; Step S12: The control device adjusts the flow rate of the first flue gas from the second flow path through the heat storage chamber according to the first flow parameter, and adjusts the first flue gas from the third flow according to the second flow parameter The flow rate of the channel flowing through the reformer, the sum of the flow rate of the first flue gas flowing through the second flow channel and the third flow channel is equal to the flow rate of the first flue gas flowing through the control device from the first flow channel; Step S14: The reformer receives the first flue gas and transforms it into a first recombined gas; Step S16: The reformer is connected to the fuel pipeline via a fourth flow path, and the first recombined gas is delivered to the fuel pipeline and mixed with the fuel gas to form a first mixed gas; Step S18: The fuel pipeline transports the first mixed gas to the combustion furnace for combustion.

Next, the structure and composition required by the method for reducing nitrogen oxides in flue gas generated by the combustion furnace of the first embodiment of the present invention will be explained. Please refer to the second figure, which is a schematic structural diagram of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the first embodiment of the present invention. As shown in the figure, the nitrogen oxide emission reduction system for flue gas generated by the combustion furnace of the first embodiment of the present invention includes: a combustion furnace 1, and a fuel gas 100 is transported through a fuel pipe 10 for combustion, and a second A flue gas 12, and the combustion furnace 1 is further connected to a control device 5 through a first flow passage 3. The control device 5 is connected to a heat storage chamber 9 through a second flow path 7 and a recombiner 13 through a third flow path 11; and a processor 15 is arranged on one side of the first flow path 3 and receives the first flue gas 12 to determine the concentration of nitrogen oxides therein, to generate a first flow parameter 150 and a second flow parameter 152 to transmit to the control device 5; wherein, the control device 5 adjusts the first flue gas 12 from the first flue gas according to the first flow parameter 150 The flow of the second flow path 7 to the heat storage chamber 9 and the flow of the first flue gas 12 from the third flow path 11 to the reformer 13 are adjusted according to the second flow parameter 152. The first flow path 3 transports the first flue gas 12 to The flow rate of the control device 5 is equal to the sum of the flow rates of the first flue gas 12 conveyed by the second flow path 7 and the third flow path 11. The reformer 13 receives the first flue gas 12 and transforms it into a first recombined gas 130. 13 is connected to the fuel line 10 through a fourth flow path 17, and the first recombined gas 130 is delivered to the fuel line 10 and mixed with the fuel gas 100 to form a first mixed gas MG1, which is mixed by the fuel line 10 The gas MG1 is sent to the combustion furnace 1 for combustion.

The above-mentioned combustion furnace 1 is a medium-sized industrial combustion equipment for combustion operation in combination with at least one regenerative burner, which generates a first flue gas 12 by performing combustion processing operations on at least one workpiece (not shown). The first flue gas 12 is a high-temperature exhaust gas generated by combustion. It is a gas composed of nitrogen oxides (NOx) and other chemical substances.

The above-mentioned processor 15 includes a gas analyzer 154 (Gas analyzer) and a computer 156. The gas analyzer 154 is electrically connected to the computer 156. The gas analyzer 154 is used to detect the nitrogen oxide concentration of the first flue gas 12 to produce A detection data 1540, and the computer 156 generates a first flow parameter 150 and a second flow parameter 152 according to the detection data 1540.

The above-mentioned control device 5 is an electric regulating valve, which serves as a three-way regulating valve to deliver the first flue gas 12 to the heat storage chamber 9 and the reformer 13 respectively, and according to the first flow parameter 150 and the second flow parameter 150 transmitted by the processor 15 The flow parameter 152 determines the flow ratio of the first flue gas 12 delivered to the heat storage chamber 9 and the reformer 13.

The aforementioned reformer 13 (Reformer) is a reactor that uses the steam reforming method to transform the first flue gas 12 into hydrogen (H2) and carbon dioxide (CO2) rich in hydrogen (H2) and carbon dioxide (CO2) through a reforming reaction. The principle of the steam reforming method is that the catalyst provided in the reformer 13 contacts the chemical substance of the first flue gas 12 to generate a catalytic reaction, and then the first recombined gas 130 is generated through the water-gas conversion reaction through the relevant raw materials.

The aforementioned first recombined gas 130 is a gas containing carbon dioxide and hydrogen, the fuel gas 100 is natural gas, and the first mixed gas MG1 is a gas containing carbon dioxide, hydrogen and natural gas.

Please refer to FIGS. 3 to 5 together, which are schematic diagrams 1 to 3 of the operation of the method for reducing nitrogen oxides from flue gas generated by the combustion furnace according to the first embodiment of the present invention. The process of reducing nitrogen oxides in flue gas generated by the combustion furnace of the present invention will be described below. First, as shown in the third figure, perform step S10: a processor obtains a nitrogen oxide concentration of the first flue gas in the first flow channel, and calculates and generates a first flow parameter and a second flow parameter, and The first flow parameter and the second flow parameter are transmitted to the control device. The combustion furnace 1 performs combustion processing on the workpiece to generate the first flue gas 12, and then receives the nitrogen oxide concentration in the flue gas through the processor 15 to generate the first flow parameter 150 and the second flow parameter 152 and transmit it to the control device 5; Among them, the first flow parameter 150 and the second flow parameter 152 are used to determine the flow ratio of the first flue gas 12 through the heat storage chamber 9 and the reformer 13 in the subsequent steps.

Continuing as shown in Figure 4, step S12 is executed: the control device adjusts the flow rate of the first flue gas from the second flow path through the heat storage chamber according to the first flow parameter, and adjusts the flow rate according to the second flow parameter The flow rate of the first flue gas flowing from the third flow path through the reformer, the sum of the flow rate of the first flue gas flowing through the second flow path and the third flow path is equal to the first flue gas from the first flow path The flow through the control device. For example, if the processor 15 determines that the nitrogen oxide concentration of the first flue gas 12 is too high or exceeds the emission standards set by laws and regulations, it may choose to receive the first flow parameter 150 and the second flow parameter 152 through the control device 5, Only part of the first flue gas 12 is delivered to the thermal storage compartment 9, and the thermal energy of the first flue gas 12 is absorbed by the thermal storage material arranged inside the thermal storage compartment 9 before being discharged to the external environment.

Since not all of the first flue gas 12 passes through the heat storage chamber 9 and is then discharged into the atmosphere, the flow of the first flue gas 12 flowing through the heat storage chamber 9 has been greatly reduced at this stage, thereby reducing the emission of nitrogen oxides. . In addition, in order to prevent 100% of the first flue gas 12 from passing through the heat storage compartment 9 to store heat, other equipment needs to be added to perform subsequent processing of the first flue gas 12 to comply with legal emission standards. Through the command executed by the control device 5 according to the second flow parameter 152, part of the first flue gas 12 is transmitted to the reformer 13 for processing, which can also increase the reuse rate of the first flue gas 12.

Then, as shown in the fifth figure, step S14 is executed: the reformer receives the first flue gas and transforms it into a first recombination gas, step S16: the reformer communicates with the fuel pipeline through a fourth flow path, and The first recombined gas is delivered to the fuel pipeline and mixed with the fuel gas to form a first mixed gas, and step S18: the fuel pipeline delivers the first mixed gas to the combustion furnace for combustion. After the reformer 13 obtains the first flue gas 12, a catalytic reaction is performed to generate the first recombined gas 130. When the combustion furnace 1 is burning, it is originally necessary to input the fuel gas 100 into the combustion chamber (not shown) through the fuel pipe 10 for combustion. Therefore, the first recombination gas 130 generated by the reformer 13 can be selected through the fuel pipe The path 10 is mixed with the fuel gas 100 to form the first mixed gas MG1, which is sent to the combustion furnace 1 to participate in combustion; wherein, the mixing ratio of the first mixed gas MG1 and the fuel gas 100 can be 1-5%, Fuel gas 100-95%, first recombination gas MG1-10%, fuel gas 100-90% or first recombination gas MG1-15%, fuel gas 100-85%. The purpose of the first mixed gas MG1 participating in the combustion in the combustion furnace 1 is to use the carbon dioxide component in the combustion process to hinder the combustion reaction and reduce the combustion temperature. In this way, it can be avoided that the combustion temperature is too high to accelerate the production of nitrogen oxides in the first flue gas 12. In addition, the hydrogen component of the first mixed gas MG1 can be used as a combustion-supporting factor in the combustion process, while avoiding the increase of intermediate products (HCN, CN, OCN) generated by the cracking due to combustion, and these intermediate products are also constituents. One of the chemical components of nitrogen oxides.

Here, the method for reducing nitrogen oxides in flue gas generated by the combustion furnace of the present invention has the following advantages: 1. When it is judged that the nitrogen oxide concentration of the first flue gas 12 is too high, the flow rate of the first flue gas 12 can be shunted to the regenerator 9 and the reformer 13 to control the delivery ratio to reduce the nitrogen oxide emissions. The reuse effect of the first flue gas 12 is also improved, and the equipment cost and time cost for the additional processing of the first flue gas 12 are further reduced. 2. The combustion of the first mixed gas MG1 in the combustion furnace 1 can effectively reduce the generation of nitrogen oxides in the flue gas. Because the chemical components contained in the first mixed gas MG1 have the effects of hindering the combustion reaction, lowering the combustion temperature, supporting combustion, and reducing the generation of intermediate products.

Here, the process steps executed by the second embodiment of the present invention are described. Please refer to Figure 6, which is the first flow chart of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace in the second embodiment of the present invention. As shown in the figure, the nitrogen oxide emission reduction method for flue gas generated by the combustion furnace in the second embodiment of the present invention is after step S18 of the first embodiment, and further includes the following steps, so steps S10 to S18 are omitted for description: Step S20: The combustion furnace burns the first mixed gas to generate a second flue gas. After the processor obtains a nitrogen oxide concentration of the second flue gas in the first flow channel, it determines whether it meets the standard and generates a determination data.

Please also refer to Figures 7 to 8B, which are the second embodiment of the flow chart, the first structural diagram, and the second structural diagram of the method for reducing nitrogen oxides from flue gas generated by the combustion furnace of the second embodiment of the present invention. As shown in the figure, the difference between the second embodiment of the present invention and the first embodiment is that it further includes step S20: the combustion furnace uses the first mixed gas to generate a second flue gas, and the processor operates in the first flow After obtaining the nitrogen oxide concentration of the second flue gas, it is judged whether it meets the standard and a judgment data is generated; wherein, the remaining steps are the same as in the first embodiment, and the description is not repeated here. When the combustion furnace 1 participates in the combustion by the first mixed gas MG1, it will also generate flue gas (represented by the second flue gas 14). After the processor 15 obtains the nitrogen oxide concentration of the second flue gas 14, it will determine the flow rate of the second flue gas 14 that the control device 5 sends to the heat storage chamber 9 and the reformer 13 due to the determination data 158.

As shown in Figures 7 and 8A, when the processor 15 obtains the nitrogen oxide concentration of the second flue gas 14 and generates the determination data 158, it determines that the nitrogen oxide concentration of the second flue gas 14 conforms to the determination data 158. In the case of a standard, the third flow parameter 160 will be generated. The control device 5 adjusts the second flue gas 14 to be completely transmitted to the heat storage compartment 9 according to the third flow parameter 160. In other words, when the processor 15 determines that the second flue gas 14 meets the emission standard, it can choose to control the control device 5 to deliver the second flue gas 14 to the thermal storage compartment 9 for heat storage, and then discharge it to the external environment. Therefore, the nitrogen oxide concentration of the second flue gas 14 no longer needs to be adjusted (it already meets the emission standards), and it is not necessary to send part of the second flue gas 14 to the reformer 13 for reprocessing, so it can flow directly after the heat storage chamber 9 It is discharged into the atmosphere.

As shown in Figure 7 and Figure 8B, if the processor 15 determines that the nitrogen oxide concentration of the second flue gas 14 does not meet a standard according to the determination data 158, a fourth flow parameter 162 and a fifth flow parameter will be generated. Flow parameter 164. The control device 5 will adjust the flow ratio of the second flue gas 14 to the heat storage compartment 9 and the reformer 13 according to the fourth flow parameter 162 and the fifth flow parameter 164. In other words, as long as the nitrogen oxide concentration of the second flue gas 14 does not meet the emission standard after the implementation steps of the first embodiment, or the concentration is still high, the same as the first embodiment can be executed for the second time. Part/all of the steps included, until the exhaust gas meets the standard value. That is, the reformer 13 receives the second flue gas 14 and transforms it into a second recombined gas 132, which is mixed with the fuel gas 100 to form a second mixed gas MG2, which is sent to the combustion furnace 1 to participate in combustion again .

Herein, the present invention has indeed achieved the intended purpose and effect of use, and is ideal and practical compared to the prior art; however, the above-mentioned embodiments are only detailed descriptions of the preferred embodiments of the present invention, and are not intended to limit the present invention. The scope of patent applications for inventions, for example, all other equivalent changes and modifications completed without departing from the technical means disclosed in the present invention, shall be included in the scope of patent applications covered by the present invention.

1: combustion furnace

10: Fuel line

100: Fuel gas

12: The first smoke

14: Second smoke

3: The first runner

5: Control device

7: Second runner

9: Thermal storage compartment

11: Third runner

13: Reorganizer

130: The first combination gas

132: The second combination gas

15: processor

150: The first flow parameter

152: Second flow parameter

154: Gas Analyzer

156: Computer

158: Judgment Data

160: third flow parameter

162: The fourth flow parameter

164: Fifth flow parameter

MG1: The first mixed gas

MG2: second mixed gas

S10: steps

S12: steps

S14: Step

S16: steps

S18: steps

S20: steps

Figure 1: It is a flow chart of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the first embodiment of the present invention; Figure 2: It is a schematic diagram of the structure of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the first embodiment of the present invention; The third figure: It is the first embodiment of the operation schematic diagram of the nitrogen oxide emission reduction method of the flue gas generated by the combustion furnace of the first embodiment of the present invention The fourth figure: It is the action schematic diagram 2 of the method for reducing nitrogen oxides of flue gas generated by the combustion furnace according to the first embodiment of the present invention; Figure 5: It is the third schematic diagram of the operation of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the first embodiment of the present invention; Figure 6: It is the first flow chart of the nitrogen oxide emission reduction method of flue gas generated by the combustion furnace in the second embodiment of the present invention; Figure 7: It is the second flow chart of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the second embodiment of the present invention; Figure 8A: It is a schematic structural diagram 1 of the method for reducing nitrogen oxides in flue gas generated by the combustion furnace according to the second embodiment of the present invention; and Figure 8B: It is the second embodiment of the structure diagram of the nitrogen oxide emission reduction method for flue gas generated by the combustion furnace of the second embodiment of the present invention.

S10: steps

S12: steps

S14: Step

S16: steps

S18: steps

Claims (10)

A method for reducing nitrogen oxides emission from flue gas generated by a combustion furnace. A combustion furnace is connected to a control device through a first flow path, and the control device is connected to a heat storage chamber through a second flow path and a recombination through a third flow path. The combustion furnace delivers a fuel gas through a fuel pipeline for combustion, and delivers a first flue gas from the first flow path to the control device. The steps include: a processor obtains from the first flow path A nitrogen oxide concentration of the first flue gas is calculated to generate a first flow parameter and a second flow parameter, and the first flow parameter and the second flow parameter are transmitted to the control device; the control device is based on The first flow parameter adjusts the flow rate of the first flue gas flowing from the second flow path through the regenerator, and adjusts the flow rate of the first flue gas flowing from the third flow path through the reformer according to the second flow parameter Flow rate, the sum of the flow rates of the first flue gas flowing through the second flow channel and the third flow channel is equal to the flow rate of the first flue gas flowing from the first flow channel through the control device; the reformer receives the first smoke The gas is converted into a first recombination gas; the reformer communicates with the fuel pipeline through a fourth flow path, and the first recombination gas is delivered to the fuel pipeline and mixed with the fuel gas to form a first mixture Gas; and the fuel pipeline transports the first mixed gas to the combustion furnace for combustion. As described in the first item of the scope of patent application, the method for reducing nitrogen oxides by generating flue gas from a combustion furnace, wherein the first recombined gas is a gas containing carbon dioxide and hydrogen, the fuel gas is natural gas, and the first mixed gas is Gas containing carbon dioxide, hydrogen and natural gas. As described in the first item of the scope of patent application, the method for reducing nitrogen oxides from flue gas generated by the combustion furnace, wherein the volume percentage of the first mixed gas and the fuel gas is 5% of the first recombined gas, and the fuel gas 95%, 10% of the first recombination gas, 90% of the fuel gas or 15% of the first recombination gas, and 85% of the fuel gas. The method for reducing nitrogen oxides from flue gas generated by a combustion furnace as described in the first item of the scope of patent application, wherein after the step of conveying the first mixed gas to the combustion furnace for combustion in the fuel pipeline, further comprises: the combustion furnace The first mixed gas is combusted to generate a second flue gas, and after the processor obtains a nitrogen oxide concentration of the second flue gas in the first flow channel, it determines whether it meets the standard and generates a determination data. The method for reducing nitrogen oxides from flue gas generated by a combustion furnace as described in item 4 of the scope of patent application, wherein the first mixed gas is burned in the combustion furnace to generate a second flue gas, and the processor is installed in the first flow channel After obtaining a nitrogen oxide concentration of the second flue gas, in the step of determining whether it meets the standard and generating a determination data, the processor determines that the nitrogen oxide concentration of the second flue gas meets the standard according to the determination data, and A third flow parameter is generated and transmitted to the control device, and the control device adjusts the second flue gas to be completely transmitted from the second flow passage to the heat storage chamber according to the third flow parameter. The method for reducing nitrogen oxides from flue gas generated by a combustion furnace as described in item 4 of the scope of patent application, wherein the first mixed gas is burned in the combustion furnace to generate a second flue gas, and the processor is installed in the first flow channel After obtaining the nitrogen oxide concentration of the second flue gas, in the step of determining whether it meets the standard and generating a determination data, the processor determines that the nitrogen oxide concentration of the second flue gas does not meet the standard according to the determination data, A fourth flow parameter and a fifth flow parameter are generated and transmitted to the control device. The control device adjusts the flow of the second flue gas from the second flow path through the heat storage chamber according to the fourth flow parameter, and according to The fifth flow parameter adjusts the flow of the second flue gas from the third flow path through the reformer. For example, the method for reducing nitrogen oxides from flue gas generated by the combustion furnace described in the scope of patent application, wherein the processor determines that the nitrogen oxide concentration of the second flue gas does not meet the standard according to the determination data, and produces A fourth flow parameter and a fifth flow parameter are transmitted to the control device. The control device adjusts the flow of the second flue gas from the second flow path through the heat storage chamber according to the fourth flow parameter, and according to the first Five flow parameters After the step of adjusting the flow rate of the second flue gas flowing through the reformer from the third flow path, the method further includes: the reformer receives the second flue gas and transforms it into a second recombined gas; the reformer delivers The second recombined gas is sent to the fuel pipeline and mixed with the fuel gas to form a second mixed gas; the fuel pipeline transports the second mixed gas to the combustion furnace for combustion. The method for reducing nitrogen oxides from flue gas generated by a combustion furnace as described in claim 1, wherein in the step of converting the first flue gas into a first recombination gas by the reformer, the reformer The first flue gas is converted by the steam reforming method to form the first recombined gas. As described in item 1 of the scope of patent application, the method for reducing nitrogen oxides from flue gas generated by a combustion furnace, wherein the control device is an electric regulating valve. The method for reducing nitrogen oxides in flue gas generated by a combustion furnace as described in the scope of patent application, wherein the processor includes a gas analyzer and a computer, the gas analyzer is electrically connected to the computer, and the gas analyzer The nitrogen oxide concentration of the first flue gas is detected to generate detection data, and the computer generates the first flow parameter and the second flow parameter according to the detection data.

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