SCR (Selective Catalytic Reduction) denitration flow field partitioning system of bituminous coal unit

Abstract

The invention provides a bituminous coal unit SCR denitration flow field partitioning system, and relates to the technical field of denitration, and the system comprises a combustion module, a nitrogen oxide detection module, a flue gas pipeline, a denitration tower, a reducing agent injection module, a catalyst layer, and a control module; the flue gas pipeline comprises a plurality of partition plates, and the area between every two adjacent partition plates is a partitioned flue; the reducing agent spraying module is arranged in the denitration tower and is positioned below an outlet of the partitioned flue; and the reducing agent spraying module is used for spraying a reducing agent to the catalyst layer, and the reducing agent reacts with nitric oxide output from the outlet of each partition flue. A plurality of partition plates are arranged in a flue gas pipeline, and a flue area is divided into a plurality of subarea flues; and the reducing agent injection system is adjusted according to the concentration data, so that effective denitration of the nitrogen oxide is realized, insufficient fusion of the nitrogen oxide and the reducing agent is avoided, and the denitration efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of denitrification technology, and in particular to a SCR denitrification flow field zoning system for a bituminous coal unit. Background Art

[0002] In the power, petrochemical and other industrial fields, the emission control of nitrogen oxides (NOx) released in industrial processes has become increasingly important. Selective catalytic reduction (SCR) denitrification technology uses ammonia to reduce NO in flue gas to non-toxic and non-polluting N2 and water vapor under the action of a catalyst in a specific temperature range to achieve the purpose of removing NOx.

[0003] The SCR denitrification method in the prior art has the problem of poor uniformity of NOx gas, which leads to insufficient reduction, air pollution and other problems, seriously affecting the safe and economic operation of coal-fired units, and further affecting the operating efficiency of the entire denitrification system. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first purpose of the present application is to propose a SCR denitrification flow field zoning system for a bituminous coal unit.

[0006] The second objective of the present application is to provide an electronic device.

[0007] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a SCR denitrification flow field zoning system for a bituminous coal unit, comprising:

[0008] Combustion module, nitrogen oxide detection module, flue gas duct, denitrification tower, reductant injection module, catalyst layer, control module;

[0009] The combustion module is used to mix and burn fuel and oxygen to produce nitrogen oxides;

[0010] The outlet of the combustion module is connected to the inlet of the flue gas duct, and the outlet of the flue gas duct is connected to the inlet of the denitration tower;

[0011] The flue gas duct comprises a plurality of partitions, and the area between adjacent partitions is a partitioned flue;

[0012] The entrance of each of the partitioned flues is provided with the nitrogen oxide detection module;

[0013] The reducing agent injection module is arranged in the denitration tower and is located below the outlet of the partitioned flue; the reducing agent injection module is used to inject the reducing agent into the catalyst layer to react with the nitrogen oxides output from the outlet of each partitioned flue;

[0014] The catalyst layer is arranged in the denitration tower, below the reduction injection module, and is used to provide a reaction site so that the nitrogen oxides and the reducing agent react under the action of the catalyst;

[0015] The control module is used to obtain concentration data detected by the nitrogen oxide detection module and adjust the reductant injection system according to the concentration data.

[0016] Optionally, the catalyst layer includes vanadium titanate, tungstate and molybdate.

[0017] Optionally, the system further comprises: a reducing agent storage module;

[0018] The reducing agent storage module is used to store the reducing agent, and the reducing agent storage module is connected to the reducing agent injection module through a reducing agent transportation pipeline;

[0019] The reducing agent storage module is further used for heating the reducing agent to vaporize the reducing agent.

[0020] Optionally, the reductant injection module includes a main valve, a diverter, a sub-valve, and an injection pipe;

[0021] The main valve is arranged on the reducing agent transport pipeline, located at the inlet of the reducing agent injection module, and is used to control the total flow of the reducing agent injection module;

[0022] The reducing agent transport pipeline is divided into a plurality of sub-pipelines at the flow divider;

[0023] The sub-valve is provided at the inlet of each sub-pipeline;

[0024] The injection pipe is arranged at the end of each of the sub-pipelines, and the sub-valve is used to control the flow of the injection pipe.

[0025] Optionally, the system further comprises a disc mixer;

[0026] The disc mixer is arranged in each of the partitioned flues, and a plurality of the disc mixers are arranged in each of the partitioned flues; the disc mixer is used to adjust the distribution uniformity of the nitrogen oxides.

[0027] To achieve the above-mentioned purpose, a second aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0028] The memory stores computer-executable instructions;

[0029] The processor executes the computer-executable instructions stored in the memory to implement the system as described in any one of the first aspects.

[0030] The SCR denitrification flow field zoning system for a bituminous coal unit provided in the present application divides the flue area into multiple partitioned flues by setting multiple partitions in the flue gas duct; and adjusts the reductant injection system according to concentration data, thereby achieving effective denitrification of nitrogen oxides, avoiding insufficient fusion of nitrogen oxides and reductants, and improving denitrification efficiency.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1 A schematic diagram of the structure of a SCR denitration flow field partitioning system for a bituminous coal unit provided in an embodiment of the present application;

[0034] Figure 2 A schematic structural diagram of a reductant injection module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0036] The embodiment of the present application provides a SCR denitrification flow field zoning system for a bituminous coal unit. Figure 1 This is a schematic diagram of the structure of a SCR denitrification flow field partition system for a bituminous coal unit provided in an embodiment of the present application. Figure 1 As shown, the system includes: a combustion module 10, a nitrogen oxide detection module 20, a flue gas duct 30, a denitration tower 40, a reducing agent injection module 50, a catalyst layer 60, and a control module;

[0037] The combustion module 10 is used to mix and burn fuel and oxygen to produce nitrogen oxides;

[0038] The outlet of the combustion module 10 is connected to the inlet of the flue gas duct 30, and the outlet of the flue gas duct 30 is connected to the inlet of the denitration tower 40;

[0039] The flue gas duct 30 includes a plurality of partitions, and the area between adjacent partitions is a partitioned flue;

[0040] The inlet of each of the partitioned flues is provided with the nitrogen oxide detection module 20;

[0041] The reducing agent injection module 50 is arranged in the denitrification tower 40 and is located below the outlet of the partitioned flue; the reducing agent injection module 50 is used to inject the reducing agent into the catalyst layer 60 to react with the nitrogen oxides output from the outlet of each of the partitioned flues; commonly used reducing agents include ammonia water, liquid ammonia and urea, among which liquid ammonia is a commonly used choice in industry.

[0042] The catalyst layer 60 is disposed in the denitration tower 40, below the reduction injection module, and is used to provide a reaction site so that the nitrogen oxides and the reducing agent react under the action of the catalyst;

[0043] The control module is used to obtain the concentration data detected by the nitrogen oxide detection module 20 and adjust the reductant injection system according to the concentration data.

[0044] In this embodiment, the flue is divided into three partitioned flues by partitions, and the interface of each partitioned flue is close to a square. The resistance in the zone is balanced by the flow blocking and mixing devices, so as to achieve a uniform flow field in the square partition.

[0045] The basic working principle of SCR denitrification technology is to use a reducing agent to selectively reduce nitrogen oxides (NOX) in flue gas into non-toxic, non-polluting nitrogen (N2) and water (H2O) under the action of a certain temperature and catalyst. The role of the catalyst is to reduce the activation energy of the reaction so that the reaction can be carried out in a lower temperature range (usually between 150 and 450°C). The injected reducing agent and NOx in the flue gas need to be fully mixed to ensure the efficiency and effect of the subsequent catalytic reaction. By dividing the flue gas into 3 groups and mixing them evenly in the partitioned flue, the flue gas entering the denitrification tower 40 can efficiently react with the reducing agent under the action of the catalyst in the catalyst layer and be reduced to N2 and H2O.

[0046] Optionally, the catalyst layer 60 includes vanadium titanate, tungstate and molybdate. These catalysts have high activity, selectivity and stability.

[0047] Optionally, the system further comprises: a reducing agent storage module 70;

[0048] The reducing agent storage module is used to store the reducing agent, and the reducing agent storage module is connected to the reducing agent injection module 50 through a reducing agent transportation pipeline;

[0049] The reducing agent storage module is further used for heating the reducing agent to vaporize the reducing agent.

[0050] Figure 2 A schematic diagram of the structure of a reducing agent injection module provided in an embodiment of the present application is shown in FIG. Figure 2 The reductant injection module 50 includes a main valve 51, a diverter 52, a sub-valve 53, and an injection pipe 54;

[0051] The main valve 51 is disposed on the reducing agent transport pipeline, located at the inlet of the reducing agent injection module 50, and is used to control the total flow of the reducing agent injection module 50;

[0052] The reducing agent transport pipeline is divided into a plurality of sub-pipelines at the splitter 52;

[0053] The inlet of each sub-pipeline is provided with the sub-valve 53;

[0054] The injection pipe 54 is disposed at the end of each of the sub-pipelines, and the sub-valve is used to control the flow of the injection pipe 54 .

[0055] In this embodiment, the flow velocities between the partitioned flues may deviate. The deviation law between the flow fields is determined by CFD flow field simulation, and the injection pipes 54 at the ends of the sub-pipelines are controlled separately according to the partitions, and the ammonia injection branch pipes are controlled based on different flow velocities.

[0056] Under the premise of retaining the control logic of the main valve 51, the control module sets the zone interval adjustment logic (mainly including the joint control logic of zone inlet flow velocity measurement, zone branch pipe opening adjustment, zone corresponding emission concentration prevention and control, etc.), and adjusts the total amount of ammonia injection of the corresponding zone through the online data of the zone front-end flow velocity. When the online data of the zone front-end flow velocity changes by 2% and remains for 1 second, adjustment is required. The adjustment amount is linearly adjusted according to the corresponding proportion to realize internal adjustment. The automatic result is corrected through the SCR outlet zone measurement point (the front-end flow velocity online data is measured at the SCR inlet) to maximize the full and uniform mixing of ammonia and nitrogen under variable load conditions.

[0057] Optionally, the system further comprises a disc mixer;

[0058] The disc mixer is arranged in each of the partitioned flues, and a plurality of the disc mixers are arranged in each of the partitioned flues; the disc mixer is used to adjust the distribution uniformity of the nitrogen oxides.

[0059] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the system provided by the above embodiments.

[0060] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the system provided by the above embodiments.

[0061] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the system provided by the above embodiments when executed by a processor.

[0062] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0063] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0064] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0065] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] Any process or system description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0068] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0069] It should be understood that the various parts of the present application can be implemented with hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or systems can be implemented with software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented with hardware, as in another embodiment, it can be implemented with any one of the following technologies known in the art or their combination: a discrete logic circuit with a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit with a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0070] A person skilled in the art may understand that all or part of the steps of the system implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the system embodiment.

[0071] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0072] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A SCR denitrification flow field zoning system for a bituminous coal unit, characterized in that: include: Combustion module, nitrogen oxide detection module, flue gas duct, denitrification tower, reductant injection module, catalyst layer, control module; The combustion module is used to mix and burn fuel and oxygen to produce nitrogen oxides; The outlet of the combustion module is connected to the inlet of the flue gas duct, and the outlet of the flue gas duct is connected to the inlet of the denitration tower; The flue gas duct comprises a plurality of partitions, and the area between adjacent partitions is a partitioned flue; The entrance of each of the partitioned flues is provided with the nitrogen oxide detection module; The reducing agent injection module is arranged in the denitration tower and is located below the outlet of the partitioned flue; the reducing agent injection module is used to inject the reducing agent into the catalyst layer to react with the nitrogen oxides output from the outlet of each partitioned flue; The catalyst layer is arranged in the denitration tower, below the reduction injection module, and is used to provide a reaction site so that the nitrogen oxides and the reducing agent react under the action of the catalyst; The control module is used to obtain concentration data detected by the nitrogen oxide detection module and adjust the reductant injection system according to the concentration data.

2. The system according to claim 1, characterized in that The catalyst layer includes vanadium titanate, tungstate and molybdate.

3. The system according to claim 2, characterized in that The system further includes: a reductant storage module; The reducing agent storage module is used to store the reducing agent, and the reducing agent storage module is connected to the reducing agent injection module through a reducing agent transportation pipeline; The reducing agent storage module is further used for heating the reducing agent to vaporize the reducing agent.

4. The system according to claim 3, characterized in that The reducing agent injection module includes a main valve, a diverter, a sub-valve, and an injection pipe; The main valve is arranged on the reducing agent transport pipeline, located at the inlet of the reducing agent injection module, and is used to control the total flow of the reducing agent injection module; The reducing agent transport pipeline is divided into a plurality of sub-pipelines at the flow divider; The sub-valve is provided at the inlet of each sub-pipeline; The injection pipe is arranged at the end of each of the sub-pipelines, and the sub-valve is used to control the flow of the injection pipe.

5. The system according to claim 4, characterized in that The system also includes a disc mixer; The disc mixer is arranged in each of the partitioned flues, and a plurality of the disc mixers are arranged in each of the partitioned flues; the disc mixer is used to adjust the distribution uniformity of the nitrogen oxides.

6. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the system according to any one of claims 1 to 5.

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