Partitioned ammonia supply system and method for gas turbine waste heat boiler denitration system

Abstract

The invention provides a gas turbine waste heat boiler denitration system partitioned ammonia supply system and method, and belongs to the technical field of gas turbine waste heat boiler denitration systems.The gas turbine waste heat boiler denitration system partitioned ammonia supply system comprises a flue gas inlet section, a flue gas outlet section, an inlet detection assembly, an outlet detection assembly and an ammonia spraying section; the treated flue gas is discharged from the flue gas outlet section; the flue gas inlet section is subjected to partition detection through the inlet detection assembly, the flue gas outlet section is subjected to partition detection through the outlet detection assembly, and the ammonia spraying amount of the ammonia spraying device in the partition corresponding to the ammonia spraying section is adjusted in a targeted mode by comparing the detection result of the partition of the flue gas inlet section and the detection result of the corresponding partition in the flue gas outlet section. Precise regulation and control of the partitioned ammonia supply amount of the denitration system under variable working conditions are achieved, so that the ammonia consumption is effectively reduced, the situation that the NOx concentration of a flue gas outlet section fluctuates greatly or even exceeds the standard is avoided, the flue gas denitration uniformity is improved, and improvement of the overall performance of the denitration system is facilitated.

Description

Technical Field

[0001] This application belongs to the technical field of denitration systems for gas turbine waste heat boilers, and particularly relates to a partitioned ammonia supply system and method for a denitration system of a gas turbine waste heat boiler. Background Art

[0002] In the flue gas denitration system, due to the large cross-sectional area of the flue and the presence of multiple diameter changes and turns, the flow field and concentration field of the flue gas are generally unevenly distributed, resulting in inaccurate and unrepresentative flow rate and nitrogen oxide measurement results at the on-line denitration measurement points. When adjusting the ammonia supply amount, due to the uneven distribution of the ammonia-nitrogen molar ratio in the reactor, it is easy to cause problems such as excessive or insufficient ammonia injection in local areas, affecting the overall denitration performance of the denitration system. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, a first aspect of the present invention provides a partitioned ammonia supply system for a gas turbine waste heat boiler denitration system.

[0005] A second aspect of the present invention provides a partitioned ammonia supply method for a gas turbine waste heat boiler denitration system.

[0006] In view of this, according to a first aspect of the embodiments of the present application, a partitioned ammonia supply system for a gas turbine waste heat boiler denitration system is proposed, including:

[0007] A flue gas inlet section and a flue gas outlet section;

[0008] An inlet detection component, which is arranged at the flue gas inlet, and the inlet detection component performs partitioned detection on the flue gas inlet section;

[0009] An outlet detection component, which is arranged at the flue gas outlet, and the outlet detection component performs partitioned detection on the flue gas outlet section;

[0010] An ammonia injection section, which is arranged between the flue gas inlet section and the flue gas outlet section, and an ammonia injection device is arranged in the ammonia injection section. The ammonia injection device performs partitioned ammonia supply to the ammonia injection section according to the detection results of the inlet detection component and the outlet detection component.

[0011] In a feasible implementation manner, the flue gas inlet section includes a plurality of inlet partitions, which are arranged along the height direction of the flue gas inlet section;

[0012] The flue gas outlet section includes a plurality of outlet partitions, which are arranged along the height direction of the flue gas outlet section;

[0013] The ammonia injection section includes a plurality of ammonia injection partitions, which are arranged along the height direction of the ammonia injection section;

[0014] Among them, the inlet partition, the ammonia injection partition, and the outlet partition correspond to each other one by one, and the numbers of the inlet partition, the ammonia injection partition, and the outlet partition are the same.

[0015] In a feasible implementation manner, the inlet detection component includes a plurality of inlet detection devices. The inlet detection devices are arranged in the inlet partition, and the inlet detection devices correspond to the inlet partition one by one. The inlet detection devices detect the flue gas concentration and the flue gas flow rate of the corresponding inlet partition.

[0016] The outlet detection component includes a plurality of outlet detection devices. The outlet detection devices are arranged in the outlet partition, and the outlet detection devices correspond to the outlet partition one by one. The outlet detection devices detect the flue gas concentration of the outlet partition.

[0017] The ammonia injection device is arranged in the ammonia injection partition, and the ammonia injection device corresponds to the ammonia injection partition one by one. The ammonia injection device adjusts the ammonia supply amount according to the detection results of the corresponding inlet detection device and the outlet detection device.

[0018] Among them, the flue gas concentration includes O2 concentration and NO x concentration.

[0019] In a feasible implementation manner, the ammonia injection device includes:

[0020] An ammonia injection pipe is arranged in the ammonia injection partition, and a regulating valve is arranged on the ammonia injection pipe.

[0021] An ammonia injection main pipe is communicated with the ammonia injection pipe.

[0022] In a feasible implementation manner, the sectionalized ammonia supply system of the gas turbine waste heat boiler denitration system further includes:

[0023] A catalytic section is arranged between the ammonia injection section and the flue gas outlet section. The catalytic section includes a plurality of catalytic partitions, and the catalytic partitions are arranged along the height direction of the catalytic section.

[0024] Among them, the catalytic partitions correspond to the ammonia injection partitions one by one, and the number of the catalytic partitions is equal to the number of the ammonia injection partitions.

[0025] According to the second aspect of the embodiments of the present application, a sectionalized ammonia supply method for a gas turbine waste heat boiler denitration system is proposed. The method is applied to the sectionalized ammonia supply system of the gas turbine waste heat boiler denitration system as described in any one of the above technical solutions, and includes:

[0026] Performing sectionalized detection;

[0027] According to the NO x concentration and the flue gas flow rate of the flue gas inlet section, obtain the theoretical ammonia supply amount of the ammonia injection section;

[0028] According to the theoretical ammonia supply amount, roughly regulate and control the ammonia supply amount of the ammonia injection section in a sectionalized manner;

[0029] According to the difference between the actual NO concentration in the flue gas outlet section and the set NO concentration in the flue gas outlet section, the ammonia supply amount is finely regulated in zones. x concentration and the set NO x concentration in the flue gas outlet section, the ammonia supply amount is finely regulated in zones.

[0030] In a feasible implementation manner, zone detection is performed, including the steps of:

[0031] The flue gas inlet section is divided into several inlet zones, and an inlet detection device is set in each inlet zone to detect the O2, NO x concentration and the flue gas flow rate in the inlet zone;

[0032] The flue gas outlet section is divided into several outlet zones, and an outlet detection device is set in each outlet zone to detect the O2, NO x concentration and the flue gas flow rate in the outlet zone.

[0033] In a feasible implementation manner, according to the NO x concentration and the flue gas flow rate in the flue gas inlet section, the theoretical ammonia supply amount for the ammonia injection section is obtained, and the steps include:

[0034] During the commissioning operation, the temperature of the flue gas is maintained within a reasonable range;

[0035] Keep the NO x concentration in each outlet zone as the set NO x concentration, and obtain the relationship function between the product value of the NO x concentration and the flue gas flow rate in each inlet zone and the ammonia supply amount;

[0036] During the actual operation process, referring to the relationship function, according to the product value of the actually detected NO x concentration and the flue gas flow rate in each inlet zone, the theoretical ammonia supply amount is obtained.

[0037] In a feasible implementation manner, according to the difference between the actual NO x concentration in the flue gas outlet section and the set NO x concentration in the flue gas outlet section, the ammonia supply amount is finely regulated in zones, and the steps include:

[0038] Check the deviation between the actual NO x concentration and the set NO x concentration in the outlet zone;

[0039] When the absolute value of the difference between the actual NO x concentration and the set NO x concentration in the outlet zone is less than or equal to 5 mg / m 3 ³, no fine zone regulation of the ammonia supply amount is performed;

[0040] When the actual NO in the outlet partition x concentration and the set NO x concentration difference is greater than 5 mg / m 3 , the ammonia supply amount is finely regulated in the partition.

[0041] In a feasible implementation, when the actual NO in the outlet partition x concentration minus the set NO x concentration difference is greater than 5 mg / m 3 , increase the ammonia supply amount until the difference is less than 5 mg / m 3 , and stop the fine partition regulation of the ammonia supply amount;

[0042] When the set NO x concentration minus the actual NO in the outlet partition x concentration difference is greater than 5 mg / m 3 , reduce the ammonia supply amount until the difference is less than 5 mg / m 3 , and stop the fine partition regulation of the ammonia supply amount.

[0043] Compared with the prior art, the partitioned ammonia supply system and method for the denitration system of a gas turbine waste heat boiler in this application have the following beneficial effects:

[0044] The partitioned ammonia supply system for the denitration system of a gas turbine waste heat boiler provided in the embodiment of this application includes a flue gas inlet section, a flue gas outlet section, an inlet detection component, an outlet detection component, and an ammonia injection section. The flue gas to be denitrated enters from the flue gas inlet section, passes through the ammonia injection section for denitration treatment of the flue gas, and the treated flue gas is discharged from the flue gas outlet section; the inlet detection component is used to perform partition detection on the flue gas inlet section, and the outlet detection component is used to perform partition detection on the flue gas outlet section. By comparing the detection results of the corresponding partitions in the flue gas inlet section partition and the flue gas outlet section, the ammonia injection amount of the ammonia injection device in the corresponding partition of the ammonia injection section is adjusted specifically, so as to achieve precise control of the partitioned ammonia supply amount of the denitration system under variable working conditions, thereby effectively reducing the ammonia consumption, and avoiding the situation that the NO x concentration in the flue gas outlet section fluctuates greatly or even exceeds the standard, improving the uniformity of flue gas denitration, and being beneficial to improving the overall performance of the denitration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0046] Figure 1 is a schematic structural diagram of a partitioned ammonia supply system for a gas turbine waste heat boiler denitration system provided by this application;

[0047] Figure 2 Schematic step flow chart of the ammonia supply system for the denitrification system of a gas turbine waste heat boiler in an embodiment provided for this application;

[0048] Among them, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0049] 11. Flue gas inlet section; 12. Flue gas outlet section; 15. Ammonia injection section; 16. Ammonia injection device; 17. Catalytic section;

[0050] 110. Inlet partition; 120. Outlet partition; 130. Inlet detection device; 140. Outlet detection device; 150. Ammonia injection partition; 170. Catalytic partition;

[0051] 161. Ammonia injection pipe; 162. Regulating valve; 163. Main ammonia injection pipe. Specific implementation manners

[0052] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0056] like Figure 1 As shown, according to the first aspect of the embodiment of the present application, a zoned ammonia supply system for a denitrification system of a waste heat boiler of a gas turbine is proposed, comprising: a flue gas inlet section 11, a flue gas outlet section 12, an inlet detection component, an outlet detection component and an ammonia injection section 15; the inlet detection component is arranged at the flue gas inlet, and the inlet detection component performs zoned detection on the flue gas inlet section 11; the outlet detection component is arranged at the flue gas outlet, and the outlet detection component performs zoned detection on the flue gas outlet section 12; the ammonia injection section 15 is arranged between the flue gas inlet section 11 and the flue gas outlet section 12, and an ammonia injection device 16 is arranged in the ammonia injection section 15, and the ammonia injection device 16 performs zoned ammonia supply to the ammonia injection section 15 according to the detection results of the inlet detection component and the outlet detection component.

[0057] The partitioned ammonia supply system of the gas turbine waste heat boiler denitration system provided in the embodiment of the present application includes a flue gas inlet section 11, a flue gas outlet section 12, an inlet detection component, an outlet detection component and an ammonia spraying section 15. The flue gas to be denitrated enters from the flue gas inlet section 11, passes through the ammonia spraying section 15, and the ammonia spraying section 15 performs denitration treatment on the flue gas, and the treated flue gas is discharged from the flue gas outlet section 12; the flue gas inlet section 11 is partitioned and detected by the inlet detection component, and the flue gas outlet section 12 is partitioned and detected by the outlet detection component. By comparing the detection results of the partitions of the flue gas inlet section 11 and the partitions corresponding to the flue gas outlet section 12, the ammonia spraying amount of the ammonia spraying device 16 in the corresponding partition of the ammonia spraying section 15 is adjusted in a targeted manner, so as to realize the precise control of the partitioned ammonia supply amount of the denitration system under variable working conditions, thereby effectively reducing the ammonia consumption and avoiding NO in the flue gas outlet section 12. x Large fluctuations in concentration or even exceeding the standard will occur, which will improve the uniformity of flue gas denitrification and help improve the overall performance of the denitrification system.

[0058] like Figure 1 As shown, in a feasible embodiment, the flue gas inlet section 11 includes a plurality of inlet partitions 110, and the inlet partitions 110 are arranged along the height direction of the flue gas inlet section 11; the flue gas outlet section 12 includes a plurality of outlet partitions 120, and the outlet partitions 120 are arranged along the height direction of the flue gas outlet section 12; the ammonia injection section 15 includes a plurality of ammonia injection partitions 150, and the ammonia injection partitions 150 are arranged along the height direction of the ammonia injection section 15; wherein, the inlet partitions 110, the ammonia injection partitions 150 and the outlet partitions 120 correspond one to one, and the number of the inlet partitions 110, the ammonia injection partitions 150 and the outlet partitions 120 are the same.

[0059] In this technical solution, zoning is carried out along the height direction of the flue longitudinal section, and the number of the inlet zones 110, the ammonia injection zones 150, and the outlet zones 120 is the same and they correspond one by one, so as to ensure that the ammonia injection amount in the ammonia injection zones 150 can accurately correspond to the inlet zones 110 and the outlet zones 120, which is beneficial to realizing the accurate regulation of the ammonia supply amount in different zones.

[0060] It should be noted that due to multiple diameter changes and turns in the flue, the height of each inlet zone 110 is set according to the size and shape of the flue. The height of each inlet zone 110 can be set to the same value, or the height of each inlet zone 110 can be set to different values. Similarly, the height of each outlet zone 120 can be set to the same value, or the height of each outlet zone 120 can be set to different values; the height of each ammonia injection zone 150 can be set to the same value, or the height of each ammonia injection zone 150 can be set to different values.

[0061] Furthermore, the lengths of all the inlet zones 110 are the same, the lengths of all the outlet zones 120 are the same, and the lengths of all the ammonia injection zones 150 are the same, so as to ensure the uniformity of denitration.

[0062] As Figure 1 shown, in a feasible implementation manner, the inlet detection assembly includes a plurality of inlet detection devices 130. The inlet detection devices 130 are arranged in the inlet zones 110, and the inlet detection devices 130 correspond to the inlet zones 110 one by one. The inlet detection devices 130 detect the flue gas concentration and the flue gas flow rate of the corresponding inlet zones 110; the outlet detection assembly includes a plurality of outlet detection devices 140. The outlet detection devices 140 are arranged in the outlet zones 120, and the outlet detection devices 140 correspond to the outlet zones 120 one by one. The outlet detection devices 140 detect the flue gas concentration of the outlet zones 120; the ammonia injection device 16 is arranged in the ammonia injection zone, and the ammonia injection device 16 corresponds to the ammonia injection zones 150 one by one. The ammonia injection device 16 adjusts the ammonia supply amount according to the detection results of the corresponding inlet detection devices 130 and outlet detection devices 140; wherein, the flue gas concentration includes O2 concentration and NO x concentration.

[0063] In this technical solution, an inlet detection device 130 is arranged in each inlet zone 110 to detect the O2 and NO x concentrations and the flue gas flow rate of each inlet zone 110, so as to obtain the theoretical ammonia supply amount, and further obtain the preset flue gas concentration of each outlet zone 120; an outlet detection device 140 is arranged in each outlet zone 120 to detect the O2 and NO x concentrations in the flue gas of each outlet zone 120, and the ammonia supply amount corresponding to the ammonia injection zone 150 is finely adjusted according to the deviation value between the detected flue gas concentration and the preset flue gas concentration.

[0064] Further, the inlet detection device 130 includes a first flue gas sampling device and a flue gas flow measurement device to respectively detect the flue gas concentration and flow rate of the inlet zone 110. The outlet detection device 140 includes a second flue gas sampling device, which only detects the actual flue gas concentration value of the outlet zone 120 and compares it with the preset flue gas concentration value of the outlet zone 120 to obtain the ammonia supply deviation. Specifically, the concentration value for comparison is the NO in the flue gas x concentration.

[0065] As Figure 1 shown, in a feasible implementation manner, the ammonia injection device 16 includes: an ammonia injection pipe 161 and an ammonia injection main pipe 163. The ammonia injection pipe 161 is arranged in the ammonia injection zone 150, and an adjustment valve 162 is arranged on the ammonia injection pipe 161; the ammonia injection main pipe 163 is communicated with the ammonia injection pipe 161.

[0066] In this technical solution, ammonia enters the ammonia injection pipes 161 in each ammonia injection zone 150 from the ammonia injection main pipe 163. By controlling the opening degree of the adjustment valve 162, the ammonia supply amount of the corresponding ammonia injection pipe 161 is controlled, so as to realize the precise regulation of the ammonia supply amount of each ammonia injection zone 150.

[0067] Further, the ammonia injection main pipe 163 vertically penetrates into the ammonia injection section 15, and the ammonia injection main pipe 163 is hermetically connected to the ammonia injection section 15 to ensure that ammonia does not escape from the joint position, ensuring stable and accurate ammonia supply.

[0068] Further, the adjustment valve 162 is an automatic valve. The adjustment valve 162 is connected to the control system, and the opening degree of each valve is automatically adjusted through the control system to automatically control the ammonia supply amount of each ammonia injection zone 150, realizing the automatic control of the denitration input and effectively reducing the work intensity of the operating personnel.

[0069] As Figure 1 shown, in a feasible implementation manner, the ammonia supply system for zoning of the denitration system of the gas turbine waste heat boiler further includes: a catalytic section 17. The catalytic section 17 is arranged between the ammonia injection section 15 and the flue gas outlet section 12. A catalyst is placed in the catalytic section 17 to form a catalytic reaction area. The catalytic section 17 includes a number of catalytic zones 170, and the catalytic zones 170 are arranged along the height direction of the catalytic section 17; wherein, the catalytic zones 170 correspond to the ammonia injection zones 150 one by one, and the number of the catalytic zones 170 is equal to the number of the ammonia injection zones 150.

[0070] In this technical solution, the catalytic section 17 is arranged after the ammonia injection section 15, and the catalytic section 17 is divided into a number of catalytic zones 170 corresponding to the ammonia injection zones 150 one by one, so as to convert NO in the flue gas into nitrogen and water under the catalytic action of the catalyst, removing NO x converted into nitrogen and water, removing NO x .

[0071] Further, the catalyst placed in the catalytic section 17 is an SCR catalyst, which realizes the efficient purification of NOx by reducing the reaction temperature, improving the selectivity, and optimizing the reaction path.

[0072] Such as Figure 2 As shown, according to the second aspect of the present application, a method for ammonia supply in zones of a denitration system for a gas turbine waste heat boiler is proposed, which is applied to the ammonia supply system in zones of a denitration system for a gas turbine waste heat boiler in any of the above technical solutions, and includes:

[0073] Step 100: Conduct zone detection;

[0074] Step 200: Obtain the theoretical ammonia supply amount of the ammonia injection section according to the NO x concentration and the flue gas flow rate at the flue gas inlet section;

[0075] Step 300: Roughly regulate the ammonia supply amount of the ammonia injection section in zones according to the theoretical ammonia supply amount;

[0076] Step 400: Fine-tune the ammonia supply amount in zones according to the difference between the actual NO x concentration at the flue gas outlet section and the set NO x concentration at the flue gas outlet section.

[0077] Through the method for ammonia supply in zones of the denitration system for a gas turbine waste heat boiler provided by the embodiments of the present application, zone detection is respectively carried out on the flue gas inlet section and the flue gas outlet section of the denitration system. Through system operation, the required theoretical ammonia supply amount is automatically calculated according to the NO x concentration and the flue gas flow rate at the flue gas inlet section. First, the ammonia supply amount of the corresponding zone in the ammonia injection section is roughly adjusted in zones according to the theoretical ammonia supply amount. According to the zone detection of the flue gas outlet section, that is, according to the difference between the actual NO x concentration at the flue gas outlet section and the set NO x concentration at the flue gas outlet section, the ammonia supply amount of the corresponding zone in the ammonia injection section is finely adjusted in zones, thereby realizing the automatic and precise regulation of the ammonia supply amount in each zone.

[0078] It can be understood that since the method for ammonia supply in zones of the denitration system for a gas turbine waste heat boiler provided by the embodiments of the present application is applied to the ammonia supply system in zones of the denitration system for a gas turbine waste heat boiler in any of the above technical solutions, the method for ammonia supply in zones of the denitration system for a gas turbine waste heat boiler has all the beneficial effects of the ammonia supply system in zones of the denitration system for a gas turbine waste heat boiler in the above technical solutions.

[0079] In a feasible implementation manner, conducting zone detection includes the steps of: dividing the flue gas inlet section into several inlet zones, setting an inlet detection device in each inlet zone, and detecting O2 and NO in the flue gas in the inlet zone xConcentration and flue gas flow rate; divide the flue gas outlet section into several outlet partitions, and install outlet detection devices in each outlet partition to detect the O2 and NO of the flue gas in the outlet partition x Concentration and flue gas flow rate.

[0080] In this technical solution, the flue gas inlet section and the flue gas outlet section are divided into equal numbers of partitions; the flue gas inlet section is divided into multiple inlet partitions, and inlet detection devices are installed in each inlet partition to detect the O2 and NO of the flue gas in the inlet partition x Concentration and flue gas flow rate, the O2 and NO of the flue gas x Concentration and flue gas flow rate are used to calculate the theoretical ammonia supply amount for each inlet partition; at the same time, the flue gas outlet section is divided into multiple outlet partitions, and outlet detection devices are installed in each outlet partition to detect the O2 and NO of the flue gas in the outlet partition x Concentration and flue gas flow rate, detect the change in flue gas concentration of the corresponding inlet partition and outlet partition through the inlet detection device and the outlet detection device, and compare the change in flue gas concentration between the inlet partition and the corresponding outlet partition, so as to calculate the ammonia supply adjustment amount for each ammonia injection partition in real time and accurately, realize the feedback adjustment of the ammonia supply amount for the ammonia injection partition, and continuously alternate between the rough adjustment and fine adjustment of the ammonia supply amount, thereby helping to achieve accurate zoning control of the ammonia supply amount in the ammonia injection section.

[0081] In a feasible implementation manner, according to the NO in the flue gas inlet section x Concentration and flue gas flow rate, obtain the theoretical ammonia supply amount of the ammonia injection section. The steps include: during the commissioning operation period, maintain the temperature of the flue gas within a reasonable range; keep the NO in each outlet partition x Concentration at the set NO x Concentration, obtain the relationship function between the product value of the NO concentration and flue gas flow rate in each inlet partition and the ammonia supply amount; during the actual operation process, refer to the relationship function, and according to the product value of the actually detected NO concentration and flue gas flow rate in each inlet partition x Concentration, obtain the theoretical ammonia supply amount. x Concentration and flue gas flow rate, obtain the theoretical ammonia supply amount.

[0082] In this technical solution, the steps for obtaining the theoretical ammonia supply amount for each partition are further given. During the commissioning operation period, maintain the temperature of the flue gas at the actual working temperature, so that the NO in each outlet partition x Concentration at the set NO x Concentration, obtain the relationship function between the product value of the NO concentration and flue gas flow rate in each inlet partition at this time and the ammonia supply amount; during the actual operation process, refer to the relationship function between the product value of the NO concentration and flue gas flow rate in the inlet partition x Concentration, and according to the product value of the actually detected NO concentration and flue gas flow rate in each inlet partition x Concentration, obtain the theoretical ammonia supply amount. x Concentration and flue gas flow rate, obtain the theoretical ammonia supply amount.

[0083] In a feasible implementation manner, according to the actual NO x Concentration and setting of flue gas outlet section NO x The difference in concentration can be used to fine-tune the ammonia supply. The steps include: checking the actual NO x Concentration and setting NO x concentration deviation; when the actual NO x Concentration and setting NO x The absolute value of the concentration difference is not greater than 5 mg / m 3 When the actual NO x Concentration and setting NO x The absolute value of the concentration difference is greater than 5 mg / m 3 When the ammonia supply is finely regulated, the amount of ammonia supplied is controlled in different areas.

[0084] In this technical solution, the regulation standard of ammonia supply in each zone is further given, and the actual NO x Concentration and outlet partition setting NO x When the outlet partition's actual NO concentration is compared x The difference between the concentration and the set value shall not exceed ±5mg / m 3 When the export partition is considered NO x The concentration meets the preset requirements. Otherwise, the ammonia supply of the ammonia injection zone corresponding to the outlet zone needs to be fine-tuned until the NO concentration of the outlet zone is x The concentration of NO meets the preset requirements x concentration.

[0085] In one possible implementation, when the actual NO of the outlet partition x Concentration minus setting NO x The difference in concentration exceeds +5 mg / m 3 When the difference is less than 5 mg / m 3 , stop fine-grained control of ammonia supply; when NO x The concentration minus the actual NO in the outlet zone x The difference in concentration is greater than 5 mg / m 3 When the ammonia supply is reduced, the difference is less than 5 mg / m 3 , stop fine-grained zoning control of ammonia supply.

[0086] In this technical solution, when the actual NO of a certain exit partition is detected, x The concentration is higher than the set value and the deviation exceeds 5 mg / m 3 When the ammonia supply is increased, the denitrification efficiency is improved to reduce the NO in the outlet zone.x Concentration until the deviation is less than 5 mg / m 3 ; When the actual NO x concentration in a certain partition at the detection outlet is lower than the set value and the deviation value exceeds 5 mg / m 3 , reduce the ammonia supply to avoid excessive ammonia injection in this ammonia injection partition, so that the NO x concentration in this outlet partition decreases until the deviation value is less than 5 mg / m 3 , then the actual NO x concentration in this outlet partition meets the set NO x concentration.

[0087] It is easy for those skilled in the art to understand that on the premise of no conflict, the above advantageous ways can be freely combined and superimposed.

[0088] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A partitioned ammonia supply system for a denitration system of a gas turbine waste heat boiler, characterized in that, The ammonia supply system for partitioned areas of the denitration system of a gas turbine waste heat boiler includes: A flue gas inlet section and a flue gas outlet section; An inlet detection assembly, which is arranged at the flue gas inlet, and the inlet detection assembly conducts partition detection on the flue gas inlet section; An outlet detection assembly, which is arranged at the flue gas outlet, and the outlet detection assembly conducts partition detection on the flue gas outlet section; An ammonia injection section, which is arranged between the flue gas inlet section and the flue gas outlet section. An ammonia injection device is arranged in the ammonia injection section, and the ammonia injection device supplies ammonia to the ammonia injection section in a partitioned manner according to the detection results of the inlet detection assembly and the outlet detection assembly.

2. The ammonia supply system for partitioned areas of the denitration system of a gas turbine waste heat boiler according to claim 1, wherein The flue gas inlet section includes a plurality of inlet partitions, and the inlet partitions are arranged along the height direction of the flue gas inlet section; The flue gas outlet section includes a plurality of outlet partitions, and the outlet partitions are arranged along the height direction of the flue gas outlet section; The ammonia injection section includes a plurality of ammonia injection partitions, and the ammonia injection partitions are arranged along the height direction of the ammonia injection section; Among them, the inlet partitions, the ammonia injection partitions and the outlet partitions correspond one by one, and the number of the inlet partitions, the ammonia injection partitions and the outlet partitions is the same.

3. The ammonia supply system for partitioned areas of the denitration system of a gas turbine waste heat boiler according to claim 2, wherein The inlet detection assembly includes a plurality of inlet detection devices, the inlet detection devices are arranged in the inlet partitions, the inlet detection devices correspond to the inlet partitions one by one, and the inlet detection devices detect the flue gas concentration and flue gas flow rate of the corresponding inlet partitions; The outlet detection assembly includes a plurality of outlet detection devices, the outlet detection devices are arranged in the outlet partitions, the outlet detection devices correspond to the outlet partitions one by one, and the outlet detection devices detect the flue gas concentration of the outlet partitions; The ammonia injection device is arranged in the ammonia injection partition, the ammonia injection device corresponds to the ammonia injection partition one by one, and the ammonia injection device adjusts the ammonia supply amount according to the detection results of the corresponding inlet detection device and the outlet detection device; Among them, the flue gas concentration includes O2 concentration and NO x concentration.

4. The ammonia supply system for partitioned areas of the denitration system of a gas turbine waste heat boiler according to claim 2, wherein The ammonia injection device includes: An ammonia injection pipe, which is arranged in the ammonia injection partition, and a regulating valve is arranged on the ammonia injection pipe; An ammonia injection main pipe, which is communicated with the ammonia injection pipe.

5. A partitioned ammonia supply system for a denitration system of a gas turbine waste heat boiler according to claim 2, characterized in that, The ammonia supply system for partitioned areas of the denitration system of a gas turbine waste heat boiler further includes: A catalytic section, which is arranged between the ammonia injection section and the flue gas outlet section. The catalytic section includes a plurality of catalytic partitions, and the catalytic partitions are arranged along the height direction of the catalytic section; Among them, the catalytic partitions correspond to the ammonia injection partitions one by one, and the number of the catalytic partitions is equal to the number of the ammonia injection partitions.

6. A method for ammonia supply in zones of a denitration system of a gas turbine waste heat boiler, characterized in that, Applied to the ammonia supply system for partitioned areas of the denitration system of a gas turbine waste heat boiler according to any one of claims 1 to 5, it includes: Conducting partition detection; According to the NO concentration and flue gas flow rate in the flue gas inlet section, obtain the theoretical ammonia supply amount in the ammonia injection section; x ​ According to the theoretical ammonia supply amount, roughly regulate and control the ammonia supply amount of the ammonia injection section; According to the difference between the actual NO concentration in the flue gas outlet section and the set NO concentration in the flue gas outlet section, the ammonia supply amount is finely regulated in a zoned manner. x x ​ 7. A method for ammonia supply in zones of a denitration system of a gas turbine waste heat boiler according to claim 6, characterized in that The partition detection includes the steps of: Divide the flue gas inlet section into several inlet sub - zones, and install inlet detection devices in each of the inlet sub - zones to detect the O2 and NO x concentrations and the flue gas flow rate in the inlet sub - zones; Divide the flue gas outlet section into a number of outlet zones, and install outlet detection devices in each of the outlet zones to detect the O2, NO x concentration and the flue gas flow rate of the flue gas in the outlet zone.

8. A method for ammonia supply in zones of a denitration system of a gas turbine waste heat boiler according to claim 7, characterized in that, The NO in the flue gas inlet section x According to the NO concentration and the flue gas flow rate, obtain the theoretical ammonia supply amount in the ammonia injection section. The steps include: During the commissioning operation, maintain the flue gas temperature within a reasonable range; Maintain the NO of each of the said outlet partitions x concentration at the set NO x concentration, and obtain the product value of the NO x concentration and flue gas flow rate in each of the said inlet partitions and the relational function of the ammonia supply amount; During the actual operation, referring to the relationship function, according to the product value of the NO x concentration and the flue gas flow rate actually detected for each of the inlet partitions, the theoretical ammonia supply amount is obtained.

9. A method for supplying ammonia by different zones in a denitration system of a waste heat boiler of a gas turbine according to claim 8, characterized in that: The difference between the actual NO concentration in the flue gas outlet section and the set NO concentration in the flue gas outlet section is used to finely adjust and control the ammonia supply amount in a partitioned manner. The steps include: x The difference between the actual NO concentration in the flue gas outlet section and the set NO concentration in the flue gas outlet section is used to finely adjust and control the ammonia supply amount in a partitioned manner. The steps include: x The difference between the actual NO concentration in the flue gas outlet section and the set NO concentration in the flue gas outlet section is used to finely adjust and control the ammonia supply amount in a partitioned manner. The steps include: Check the actual NO x concentration in the outlet partition and the deviation from the set NO x concentration; When the absolute value of the difference between the actual NO x concentration in the outlet partition and the set NO x concentration is less than or equal to 5 mg / m 3 , the fine partition regulation of the ammonia supply amount is not carried out; When the absolute value of the difference between the actual NO x concentration in the outlet partition and the set NO x concentration is greater than 5 mg / m 3 , the ammonia supply amount is finely partitioned and regulated.

10. The method for partitioning ammonia supply of a gas turbine waste heat boiler denitration system according to claim 9, characterized in that When the actual NO x concentration in the outlet partition minus the set NO x concentration difference is greater than 5 mg / m 3 , increase the ammonia supply amount until the difference is less than 5 mg / m 3 , and stop the fine partition regulation of the ammonia supply amount; When the set NO x concentration minus the actual NO x concentration difference is greater than 5 mg / m 3 , reduce the ammonia supply amount until the difference is less than 5 mg / m 3 , and stop the fine zoning regulation of the ammonia supply amount.

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