Desulfurization and denitration method and device for industrial flue gas

Abstract

The invention discloses a desulfurization and denitrification method and device for industrial flue gas. The method comprises the following steps: judging whether the content of nitric oxide in flue gas is higher than a preset threshold value or not; if yes, whether the smoke flow speed is higher than a preset flow speed threshold value or not is judged; if yes, whether the flue gas temperature is higher than a preset temperature threshold value or not is judged; if yes, whether the rising and falling duration time of the content of the oxynitride in the smoke is higher than a preset time threshold value or not is judged; if yes, whether the reaction speed of the flue gas and the ammonia gas is lower than a preset reaction threshold value or not is judged; if yes, it is judged that the area of the ammonia gas discharge hole is increased, decreased or unchanged, the accuracy of the ammonia gas release amount can be improved, the situation that ammonia children escape after the ammonia gas cannot fully react due to quantitative release of the ammonia gas can be avoided, and meanwhile the influence on the external environment due to the fact that redundant ammonia gas is discharged along with gas after being not reacted can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization and denitrification of industrial flue gas, in particular to a method and a device for desulfurization and denitrification of industrial flue gas. Background Art

[0002] The main purpose of the desulfurization and denitrification system for industrial flue gas is to reduce the emission of atmospheric pollutants and protect the environment and human health. The desulfurization and denitrification system can effectively remove sulfur dioxide and nitrogen oxides from flue gas, both of which are the main components of atmospheric pollution. By reducing their emissions, the system helps reduce atmospheric acidification and the formation of photochemical smog, thereby significantly improving air quality.

[0003] In the process of denitrification, existing equipment needs to use ammonia to chemically react with nitrogen oxides to reduce nitrogen oxides in flue gas. Existing ammonia emissions are generally fixed-dose emissions. The content of nitrogen oxides in flue gas is variable. At the same time, the flow rate, temperature and reaction efficiency of the flue gas are also variable. Quantitative emissions can easily lead to the failure of excess ammonia to fully react, causing ammonia escape, making it easy for the final flue gas to exceed the ammonia standard, affecting the atmospheric environment, and also causing a waste of ammonia. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a method and device for desulfurization and denitrification of industrial flue gas, which can accurately control the emission of ammonia so that ammonia can fully react with nitrogen oxides in the flue gas, reduce unnecessary ammonia emission, avoid ammonia escape, avoid the impact of excess ammonia on the environment caused by flue gas emission, and reduce the waste of ammonia.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method and device for desulfurization and denitrification of industrial flue gas, which comprises the following steps:

[0008] Determine whether the nitrogen oxide content in the flue gas is higher than a preset threshold;

[0009] If so, determine whether the flue gas flow rate is higher than a preset flow rate threshold;

[0010] If so, determine whether the flue gas temperature is higher than a preset temperature threshold;

[0011] If so, it is determined whether the duration of the rise and fall of the nitrogen oxide content in the flue gas is higher than a preset time threshold;

[0012] If so, it is determined whether the reaction rate of the flue gas and ammonia is lower than a preset reaction threshold;

[0013] If so, it is determined whether the area of ​​the ammonia discharge hole increases, decreases, or remains unchanged.

[0014] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, if it is judged that the content of nitrogen oxides in the flue gas is higher than a preset content threshold, and it is judged that the duration of the increase of the content of nitrogen oxides in the flue gas is higher than the preset content threshold, the area of ​​the ammonia discharge hole is increased;

[0015] If it is determined that the nitrogen oxide content in the flue gas is higher than the preset content threshold, and it is determined that the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole remains unchanged;

[0016] If it is determined that the nitrogen oxide content in the flue gas is lower than a preset content threshold, and if it is determined that the duration of the decrease in the nitrogen oxide content in the flue gas is higher than a preset time threshold, the area of ​​the ammonia discharge hole is reduced.

[0017] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, it further comprises:

[0018] If it is determined that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is lower than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is lower than the preset time threshold, and the reaction rate of the flue gas and ammonia is higher than the preset content threshold, then the area of ​​the ammonia discharge hole remains unchanged;

[0019] If it is judged that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is judged to be higher than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than the preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than the preset reaction threshold, then the area of ​​the ammonia discharge hole is increased;

[0020] If it is determined that the nitrogen oxide content in the flue gas is higher than a preset content threshold, and the flue gas flow rate is higher than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is higher than a preset time threshold, and the reaction rate of the flue gas and ammonia is lower than a preset reaction threshold, then the area of ​​the ammonia discharge hole is increased;

[0021] If it is determined that the nitrogen oxide content in the flue gas is lower than a preset content threshold, and the flue gas flow rate is lower than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is lower than a preset time threshold, and the reaction rate of the flue gas and ammonia is higher than a preset content threshold, then the area of ​​the ammonia discharge hole is reduced;

[0022] If it is determined that the content of nitrogen oxides in the flue gas is higher than a preset content threshold, and the flue gas flow rate is determined to be lower than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is lower than a preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than a preset reaction threshold, then the area of ​​the ammonia discharge hole is reduced;

[0023] If it is judged that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is higher than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is lower than the preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than the preset reaction threshold, then the area of ​​the ammonia discharge hole remains unchanged.

[0024] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, the method further comprises: after determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further comprises:

[0025] Determine whether the flue gas flow rate is higher than a preset flow rate threshold;

[0026] If so, determine whether the flue gas temperature is higher than a preset temperature threshold;

[0027] If so, the area of ​​the ammonia discharge hole increases;

[0028] Determine whether the flue gas flow rate is higher than a preset flow rate threshold: if the flue gas flow rate is higher than the preset flow rate threshold, and the flue gas temperature is not lower than the preset threshold, determine whether the flue gas volume increases, and if so, increase the area of ​​the ammonia gas discharge hole;

[0029] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is higher than the preset flow rate threshold, and the flue gas volume does not increase, then the ammonia gas discharge hole area is increased;

[0030] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is lower than the preset temperature threshold, and the flue gas flow rate is lower than the preset flow rate threshold; and the flue gas volume does not increase, then the ammonia gas discharge hole area is reduced;

[0031] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is higher than the preset flow rate threshold; or if the nitrogen oxide content in the flue gas is higher than the preset content threshold, and the flue gas volume does not increase, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the area of ​​the ammonia discharge hole is increased;

[0032] Determine whether the above-mentioned flue gas temperature is higher than the preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is lower than the preset flow rate threshold; or the nitrogen oxide content in the flue gas is lower than the preset content threshold, and the flue gas volume does not increase, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the area of ​​the ammonia discharge hole remains unchanged.

[0033] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, the method further comprises: after determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further comprises:

[0034] Determine whether the flue gas temperature is higher than a preset temperature threshold;

[0035] If so, determine whether the flue gas flow rate is higher than a preset flow rate threshold;

[0036] If so, determine whether the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than a preset time threshold;

[0037] If so, the area of ​​the ammonia discharge hole increases;

[0038] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is higher than the preset content threshold, then the flue gas flow rate is higher than the preset flow rate threshold, and the ammonia discharge hole area is increased;

[0039] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the flue gas flow rate is lower than the preset flow rate threshold, and the ammonia gas discharge hole area is reduced;

[0040] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is higher than the preset content threshold, then the flue gas flow rate is lower than the preset flow rate threshold, and the ammonia discharge hole area remains unchanged;

[0041] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease in the nitrogen oxide content in the flue gas is higher than the preset time threshold, then the flue gas flow rate is higher than the preset flow rate threshold, and the ammonia discharge hole area remains unchanged;

[0042] Determine whether the above-mentioned flue gas temperature is higher than the preset temperature threshold; if it is judged that the flue gas temperature is higher than the preset temperature threshold, and it is judged that the duration of the decrease in the nitrogen oxide content in the flue gas is lower than the preset content threshold, then it is judged that the flue gas flow rate is higher than the preset flow rate threshold, and the area of ​​the ammonia discharge hole is increased.

[0043] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, the method further comprises: after determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further comprises:

[0044] It is determined whether the reaction rate of flue gas and ammonia is lower than the preset reaction threshold.

[0045] If so, determine whether the flue gas temperature is higher than a preset temperature threshold;

[0046] If so, determine whether the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than a preset time threshold;

[0047] If so, the area of ​​the ammonia discharge hole increases;

[0048] If it is determined that the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is increased;

[0049] If it is determined that the reaction rate of the flue gas and ammonia is higher than the preset threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole remains unchanged;

[0050] If it is determined that the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase of the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is reduced;

[0051] If the reaction rate of flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase of nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is reduced.

[0052] If the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease of the nitrogen oxide content in the flue gas is lower than the preset content threshold, the area of ​​the ammonia discharge hole is reduced;

[0053] If the reaction rate of flue gas and ammonia is higher than a preset threshold, and the flue gas temperature is higher than a preset temperature threshold, and the duration of the decrease of nitrogen oxide content in the flue gas is higher than a preset time threshold, the area of ​​the ammonia discharge hole is reduced;

[0054] If the reaction rate of flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the decrease in the nitrogen oxide content in the flue gas is lower than the preset content threshold, the area of ​​the ammonia discharge hole is reduced.

[0055] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, the method and device include:

[0056] The reaction device comprises a reaction box, pipes arranged at both ends of the reaction box, and a temperature sensor, a nitrogen oxide detector, a flow rate detector and a laser sensor arranged inside the pipes.

[0057] As a preferred embodiment of the method and device for desulfurization and denitrification of industrial flue gas of the present invention, a partition is arranged inside the reaction box, a cover plate is slidably installed on the top of the partition, a group of electric telescopic rods are arranged on the top of the partition, a group of limit blocks are arranged on the top of the cover plate, one end of the electric telescopic rod is fixedly connected to the limit block, three gas pipes are arranged on the top of the reaction box, one end of the gas pipes passes through the top of the reaction box and extends to the inside of the reaction box.

[0058] Beneficial effects of the present invention: The present invention uses multiple sensors to obtain the content of nitrogen oxides in the flue gas, the flow rate of the flue gas, the temperature of the flue gas, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas to determine the amount of ammonia released. This can improve the accuracy of the ammonia release amount, avoid the situation where ammonia escapes due to the inability of ammonia to fully react due to the quantitative release of ammonia, and at the same time avoid the influence of excess ammonia on the external environment after being discharged with the gas after unreacted. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0060] Figure 1The present invention is a schematic flow chart of a method and device for desulfurization and denitrification of industrial flue gas.

[0061] Figure 2 It is a schematic diagram of the overall structure of the desulfurization and denitrification method and device for industrial flue gas.

[0062] Figure 3 This is a schematic diagram of the internal structure of a method and device for desulfurization and denitrification of industrial flue gas. DETAILED DESCRIPTION

[0063] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0064] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0065] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0066] Example 1

[0067] Reference Figure 1 , which is the first embodiment of the present invention, provides a method and device for desulfurization and denitrification of industrial flue gas, which comprises the following steps:

[0068] Determine whether the nitrogen oxide content in the flue gas is higher than a preset threshold;

[0069] If so, determine whether the flue gas flow rate is higher than a preset flow rate threshold;

[0070] If so, determine whether the flue gas temperature is higher than a preset temperature threshold;

[0071] If so, it is determined whether the duration of the rise and fall of the nitrogen oxide content in the flue gas is higher than a preset time threshold;

[0072] If so, it is determined whether the reaction rate of the flue gas and ammonia is lower than a preset reaction threshold;

[0073] If so, the area of ​​the ammonia discharge hole increases, decreases or remains unchanged.

[0074] Further, if it is determined that the content of nitrogen oxides in the flue gas is higher than a preset content threshold, and it is determined that the duration of the increase in the content of nitrogen oxides in the flue gas is higher than the preset content threshold, the area of ​​the ammonia discharge hole is increased;

[0075] If it is determined that the nitrogen oxide content in the flue gas is higher than the preset content threshold, and it is determined that the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole remains unchanged;

[0076] If it is determined that the nitrogen oxide content in the flue gas is lower than a preset content threshold, and if it is determined that the duration of the decrease in the nitrogen oxide content in the flue gas is higher than a preset time threshold, the area of ​​the ammonia discharge hole is reduced.

[0077] Furthermore, it also includes:

[0078] If it is determined that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is lower than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is lower than the preset time threshold, and the reaction rate of the flue gas and ammonia is higher than the preset content threshold, then the area of ​​the ammonia discharge hole remains unchanged;

[0079] If it is judged that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is judged to be higher than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than the preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than the preset reaction threshold, then the area of ​​the ammonia discharge hole is increased;

[0080] If it is determined that the nitrogen oxide content in the flue gas is higher than a preset content threshold, and the flue gas flow rate is higher than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is higher than a preset time threshold, and the reaction rate of the flue gas and ammonia is lower than a preset reaction threshold, then the area of ​​the ammonia discharge hole is increased;

[0081] If it is determined that the nitrogen oxide content in the flue gas is lower than a preset content threshold, and the flue gas flow rate is lower than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is lower than a preset time threshold, and the reaction rate of the flue gas and ammonia is higher than a preset content threshold, then the area of ​​the ammonia discharge hole is reduced;

[0082] If it is determined that the content of nitrogen oxides in the flue gas is higher than a preset content threshold, and the flue gas flow rate is determined to be lower than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is lower than a preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than a preset reaction threshold, then the area of ​​the ammonia discharge hole is reduced;

[0083] If it is judged that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is higher than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is lower than the preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than the preset reaction threshold, then the area of ​​the ammonia discharge hole remains unchanged.

[0084] Furthermore, the method further comprises: after the step of determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further comprises:

[0085] Determine whether the flue gas flow rate is higher than a preset flow rate threshold;

[0086] If so, determine whether the flue gas temperature is higher than a preset temperature threshold;

[0087] If so, the area of ​​the ammonia discharge hole increases;

[0088] Determine whether the flue gas flow rate is higher than a preset flow rate threshold: if the flue gas flow rate is higher than the preset flow rate threshold, and the flue gas temperature is not lower than the preset threshold, determine whether the flue gas volume increases, and if so, increase the area of ​​the ammonia gas discharge hole;

[0089] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is higher than the preset flow rate threshold, and the flue gas volume does not increase, then the ammonia gas discharge hole area is increased;

[0090] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is lower than the preset temperature threshold, and the flue gas flow rate is lower than the preset flow rate threshold; and the flue gas volume does not increase, then the ammonia gas discharge hole area is reduced;

[0091] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is higher than the preset flow rate threshold; or if the nitrogen oxide content in the flue gas is higher than the preset content threshold, and the flue gas volume does not increase, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the area of ​​the ammonia discharge hole is increased;

[0092] Determine whether the above-mentioned flue gas temperature is higher than the preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is lower than the preset flow rate threshold; or the nitrogen oxide content in the flue gas is lower than the preset content threshold, and the flue gas volume does not increase, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the area of ​​the ammonia discharge hole remains unchanged.

[0093] Furthermore, the method further comprises: after the step of determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further comprises:

[0094] Determine whether the flue gas temperature is higher than a preset temperature threshold;

[0095] If so, determine whether the flue gas flow rate is higher than a preset flow rate threshold;

[0096] If so, determine whether the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than a preset time threshold;

[0097] If so, the area of ​​the ammonia discharge hole increases;

[0098] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is higher than the preset content threshold, then the flue gas flow rate is higher than the preset flow rate threshold, and the ammonia discharge hole area is increased;

[0099] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the flue gas flow rate is lower than the preset flow rate threshold, and the ammonia gas discharge hole area is reduced;

[0100] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is higher than the preset content threshold, then the flue gas flow rate is lower than the preset flow rate threshold, and the ammonia discharge hole area remains unchanged;

[0101] Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease in the nitrogen oxide content in the flue gas is higher than the preset time threshold, then the flue gas flow rate is higher than the preset flow rate threshold, and the ammonia discharge hole area remains unchanged;

[0102] Determine whether the above-mentioned flue gas temperature is higher than the preset temperature threshold; if it is judged that the flue gas temperature is higher than the preset temperature threshold, and it is judged that the duration of the decrease in the nitrogen oxide content in the flue gas is lower than the preset content threshold, then it is judged that the flue gas flow rate is higher than the preset flow rate threshold, and the area of ​​the ammonia discharge hole is increased.

[0103] Furthermore, the method further comprises: after the step of determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further comprises:

[0104] It is determined whether the reaction rate of flue gas and ammonia is lower than the preset reaction threshold.

[0105] If so, determine whether the flue gas temperature is higher than a preset temperature threshold;

[0106] If so, determine whether the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than a preset time threshold;

[0107] If so, the area of ​​the ammonia discharge hole increases;

[0108] If it is determined that the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is increased;

[0109] If it is determined that the reaction rate of the flue gas and ammonia is higher than the preset threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole remains unchanged;

[0110] If it is determined that the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase of the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is reduced;

[0111] If the reaction rate of flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase of nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is reduced.

[0112] If the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease of the nitrogen oxide content in the flue gas is lower than the preset content threshold, the area of ​​the ammonia discharge hole is reduced;

[0113] If the reaction rate of flue gas and ammonia is higher than a preset threshold, and the flue gas temperature is higher than a preset temperature threshold, and the duration of the decrease of nitrogen oxide content in the flue gas is higher than a preset time threshold, the area of ​​the ammonia discharge hole is reduced;

[0114] If the reaction rate of flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the decrease in the nitrogen oxide content in the flue gas is lower than the preset content threshold, the area of ​​the ammonia discharge hole is reduced.

[0115] It should be noted that there are three thresholds for the nitrogen oxide content, one is the normal threshold, one is higher than the normal threshold and the other is lower than the normal threshold. There are also three thresholds for the flue gas flow rate, one is the normal flow threshold, one is higher than the normal flow rate threshold, and the other is lower than the normal flow rate threshold. There are three thresholds for the flue gas temperature, the first is the normal temperature threshold, the second is the threshold higher than the normal temperature threshold, and the third is the threshold lower than the normal temperature threshold. There are two thresholds for the duration of the increase and decrease of the nitrogen oxide content in the flue gas, one is the duration of the increase, and the other is the duration of the decrease. The reaction rate of the flue gas and ammonia is the first normal reaction threshold, the second is the threshold lower than the reaction rate, and the third is the threshold higher than the normal reaction rate. The model of the temperature sensor 103 is TMP006, the model of the nitrogen oxide detector 104 is Model 42i-HLNOx Analyze, the model of the flow rate detector 105 is SITRANSF Meters, and the model of the laser sensor 106 is LASERCHECK NH3.

[0116] Example 2

[0117] Reference Figures 2-3 , which is the second embodiment of the present invention, and provides a method and device for desulfurization and denitrification of industrial flue gas, which includes a reaction device 100, wherein the reaction device 100 includes a reaction box 101, pipes 102 arranged at both ends of the reaction box 101, a temperature sensor 103, a nitrogen oxide detector 104, a flow rate detector 105 and a laser sensor 106 arranged inside the pipe 102.

[0118] Furthermore, a partition 101a is provided inside the reaction box 101, a cover plate 101b is slidably installed on the top of the partition 101a, a group of electric telescopic rods 101c are provided on the top of the partition 101a, and a group of limit blocks 101d are provided on the top of the cover plate 101b. One end of the electric telescopic rod 101c is fixedly connected to the limit block 101d. Three gas pipes 101e are provided on the top of the reaction box 101, and one end of the gas pipe 101e passes through the top of the reaction box 101 and extends into the interior of the reaction box 101.

[0119] It should be noted that an exhaust hole is opened on the top of the partition 101a, the width of the exhaust hole is smaller than the width of the cover plate 101b, and the length of the exhaust hole is the same as the length of the cover plate 101b.

[0120] When in use, the electric telescopic rod 101c is started by the control system. When the telescopic end of the electric telescopic rod 101c is extended and retracted toward the inside of the reaction box 101, it drives the limit block 101d to move inward. The limit block 101d drives the cover plate 101b to move. The movement of the cover plate 101b makes the covered exhaust hole larger. Further, when the electric telescopic rod 101c is retracted, the cover plate 101b moves to make the covered exhaust smaller.

[0121] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0122] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0123] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0124] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method and device for desulfurization and denitrification of industrial flue gas, characterized in that: The steps include: Determine whether the nitrogen oxide content in the flue gas is higher than a preset content threshold; If so, determine whether the flue gas flow rate is higher than a preset flow rate threshold; If so, determine whether the flue gas temperature is higher than a preset temperature threshold; If so, it is determined whether the duration of the rise and fall of the nitrogen oxide content in the flue gas is higher than a preset time threshold; If so, it is determined whether the reaction rate of the flue gas and ammonia is lower than a preset reaction threshold; If so, it is determined whether the area of ​​the ammonia discharge hole increases, decreases, or remains unchanged.

2. The method and device for desulfurization and denitrification of industrial flue gas according to claim 1, characterized in that: If it is determined that the nitrogen oxide content in the flue gas is higher than a preset content threshold, and it is determined that the duration of the increase in the nitrogen oxide content in the flue gas is higher than a preset time threshold, the area of ​​the ammonia discharge hole is increased; If it is determined that the nitrogen oxide content in the flue gas is higher than the preset content threshold, and it is determined that the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole remains unchanged; If it is determined that the nitrogen oxide content in the flue gas is lower than a preset content threshold, and if it is determined that the duration of the decrease in the nitrogen oxide content in the flue gas is higher than a preset time threshold, the area of ​​the ammonia discharge hole is reduced.

3. The method and device for desulfurization and denitrification of industrial flue gas according to claim 1 or 2, characterized in that: Also includes: If it is determined that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is lower than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is lower than the preset time threshold, and the reaction rate of the flue gas and ammonia is higher than the preset content threshold, then the area of ​​the ammonia discharge hole remains unchanged; If it is judged that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is judged to be higher than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than the preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than the preset reaction threshold, then the area of ​​the ammonia discharge hole is increased; If it is determined that the nitrogen oxide content in the flue gas is higher than a preset content threshold, and the flue gas flow rate is higher than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is higher than a preset time threshold, and the reaction rate of the flue gas and ammonia is lower than a preset reaction threshold, then the area of ​​the ammonia discharge hole is increased; If it is determined that the nitrogen oxide content in the flue gas is lower than a preset content threshold, and the flue gas flow rate is lower than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is lower than a preset time threshold, and the reaction rate of the flue gas and ammonia is higher than a preset content threshold, then the area of ​​the ammonia discharge hole is reduced; If it is determined that the content of nitrogen oxides in the flue gas is higher than a preset content threshold, and the flue gas flow rate is determined to be lower than a preset flow rate threshold, and the duration of the rise and fall of the nitrogen oxide content in the flue gas is lower than a preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than a preset reaction threshold, then the area of ​​the ammonia discharge hole is reduced; If it is judged that the content of nitrogen oxides in the flue gas is higher than the preset content threshold, and the flue gas flow rate is higher than the preset flow rate threshold, and the duration of the increase and decrease of the nitrogen oxide content in the flue gas is lower than the preset time threshold, and the reaction rate of the flue gas and ammonia is not lower than the preset reaction threshold, then the area of ​​the ammonia discharge hole remains unchanged.

4. The method and device for desulfurization and denitrification of industrial flue gas according to claim 3, characterized in that: The method further includes: after the step of determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further includes: Determine whether the flue gas flow rate is higher than a preset flow rate threshold; If so, determine whether the flue gas temperature is higher than a preset temperature threshold; If so, the area of ​​the ammonia discharge hole increases; Determine whether the flue gas flow rate is higher than a preset flow rate threshold: if the flue gas flow rate is higher than the preset flow rate threshold, and the flue gas temperature is not lower than the preset threshold, determine whether the flue gas volume increases, and if so, increase the area of ​​the ammonia gas discharge hole; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is higher than the preset flow rate threshold, and the flue gas volume does not increase, then the ammonia gas discharge hole area is increased; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is lower than the preset temperature threshold, and the flue gas flow rate is lower than the preset flow rate threshold; and the flue gas volume does not increase, then the ammonia gas discharge hole area is reduced; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is higher than the preset flow rate threshold; or if the nitrogen oxide content in the flue gas is higher than the preset content threshold, and the flue gas volume does not increase, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the area of ​​the ammonia discharge hole is increased; Determine whether the above-mentioned flue gas temperature is higher than the preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the flue gas flow rate is lower than the preset flow rate threshold; or the nitrogen oxide content in the flue gas is lower than the preset content threshold, and the flue gas volume does not increase, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the area of ​​the ammonia discharge hole remains unchanged.

5. The method and device for desulfurization and denitrification of industrial flue gas according to claim 4, characterized in that: The method further includes: after the step of determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further includes: Determine whether the flue gas temperature is higher than a preset temperature threshold; If so, determine whether the flue gas flow rate is higher than a preset flow rate threshold; If so, determine whether the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than a preset time threshold; If so, the area of ​​the ammonia discharge hole increases; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is higher than the preset content threshold, then the flue gas flow rate is higher than the preset flow rate threshold, and the ammonia discharge hole area is increased; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, then the flue gas flow rate is lower than the preset flow rate threshold, and the ammonia gas discharge hole area is reduced; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is higher than the preset content threshold, then the flue gas flow rate is lower than the preset flow rate threshold, and the ammonia discharge hole area remains unchanged; Determine whether the flue gas temperature is higher than a preset temperature threshold; if the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease in the nitrogen oxide content in the flue gas is higher than the preset time threshold, then the flue gas flow rate is higher than the preset flow rate threshold, and the ammonia discharge hole area remains unchanged; Determine whether the above-mentioned flue gas temperature is higher than the preset temperature threshold; if it is judged that the flue gas temperature is higher than the preset temperature threshold, and it is judged that the duration of the decrease in the nitrogen oxide content in the flue gas is lower than the preset content threshold, then it is judged that the flue gas flow rate is higher than the preset flow rate threshold, and the area of ​​the ammonia discharge hole is increased.

6. The method and device for desulfurization and denitrification of industrial flue gas according to claim 5, characterized in that: The method further includes: after the step of determining whether the content of nitrogen oxides in the flue gas exceeds a preset content threshold, the method further includes: It is determined whether the reaction rate of flue gas and ammonia is lower than the preset reaction threshold. If so, determine whether the flue gas temperature is higher than a preset temperature threshold; If so, determine whether the duration of the increase and decrease of the nitrogen oxide content in the flue gas is higher than a preset time threshold; If so, the area of ​​the ammonia discharge hole increases; If it is determined that the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is increased; If it is determined that the reaction rate of the flue gas and ammonia is higher than the preset threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the increase in the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole remains unchanged; If it is determined that the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase of the nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is reduced; If the reaction rate of flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the increase of nitrogen oxide content in the flue gas is lower than the preset time threshold, the area of ​​the ammonia discharge hole is reduced. If the reaction rate of the flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease of the nitrogen oxide content in the flue gas is lower than the preset content threshold, the area of ​​the ammonia discharge hole is reduced; If the reaction rate of flue gas and ammonia is higher than the preset threshold, and the flue gas temperature is higher than the preset temperature threshold, and the duration of the decrease of nitrogen oxide content in the flue gas is higher than the preset time threshold, the area of ​​the ammonia discharge hole is reduced; If the reaction rate of flue gas and ammonia is lower than the preset reaction threshold, and the flue gas temperature is lower than the preset temperature threshold, and the duration of the decrease in the nitrogen oxide content in the flue gas is lower than the preset content threshold, the area of ​​the ammonia discharge hole is reduced.

7. The desulfurization and denitrification device for industrial flue gas according to any one of claims 1 to 6, characterized in that: include; A reaction device (100) comprising a reaction box (101), pipes (102) arranged at both ends of the reaction box (101), a temperature sensor (103), a nitrogen oxide detector (104), a flow rate detector (105) and a laser sensor (106) arranged inside the pipe (102).

8. The desulfurization and denitrification device for industrial flue gas according to claim 7, characterized in that: A partition (101a) is provided inside the reaction box (101), a cover plate (101b) is slidably mounted on the top of the partition (101a), a group of electric telescopic rods (101c) are provided on the top of the partition (101a), and a group of limit blocks (101d) are provided on the top of the cover plate (101b), one end of the electric telescopic rod (101c) is fixedly connected to the limit block (101d), and three gas pipes (101e) are provided on the top of the reaction box (101), and one end of the gas pipe (101e) passes through the top of the reaction box (101) and extends into the interior of the reaction box (101).

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