Infrared temperature measurement cooperative control flue gas depth denitration system

Abstract

The utility model discloses an infrared temperature measurement cooperative control flue gas depth denitration system. The system comprises an infrared temperature measurement system, an SNCR (selective non-catalytic reduction) denitration system and a PNCR denitration system, the infrared temperature measuring system is arranged on the incinerator; the SNCR denitration system and the PNCR denitration system are both located on the side wall of the incinerator. The SNCR denitration system comprises an ammonia water solution storage system, an ammonia water solution dilution system and an ammonia water injection system; the ammonia water solution storage system and the ammonia water solution dilution system are connected with the ammonia water injection system; the PNCR denitration system comprises a PNCR denitration storage system, a conveyor and a denitration injection system; the conveyor, the PNCR denitration storage system and the denitration injection system are connected in sequence. The system has the advantages of low investment and operation cost and capability of realizing ultralow emission of NOx.

Description

Technical Field

[0001] This utility model relates to the field of municipal solid waste treatment, and more specifically, it is a denitrification system for flue gas from municipal solid waste incineration. More specifically, it is an infrared temperature measurement-assisted control system for deep denitrification of flue gas. Background Technology

[0002] Currently, incineration has become the mainstream technology for waste treatment in my country, effectively achieving the harmless, reduced-volume, and resource-based treatment of waste. The flue gas generated during incineration must be purified to meet pollutant emission standards before being released. Environmental operating costs constitute a major part of the operating costs of waste-to-energy incineration plants; therefore, reducing environmental operating costs can effectively improve the economic efficiency of the plant.

[0003] Waste incineration plants typically employ SNCR (Synthetic Non-Reactive Catalytic Reduction) in-furnace denitrification technology, using ammonia as the denitrification agent. However, with increasingly stringent environmental regulations, existing SNCR systems are no longer sufficient to meet ultra-low emission requirements, necessitating the addition of an external SCR (Self-Reactive Catalytic Reduction) system. The SCR system can use ammonia or ammonia as the denitrification agent. Ammonia gas is generated through high-temperature air or flue gas evaporation, urea hydrolysis, or pyrolysis. Under the action of a catalyst, the ammonia reacts with NOx in the flue gas to produce N2 and H2O, achieving NOx removal.

[0004] However, the SCR denitrification reaction temperature needs to be above 180℃, which not only requires the addition of a heat exchanger but also the installation of a fixed catalyst layer. This consumes a large amount of steam and increases system resistance, thus increasing both investment and the operation and maintenance costs of the flue gas purification system. Based on this, this invention proposes a deep denitrification technology for waste incineration flue gas.

[0005] Currently, the main way to achieve ultra-low NOx emissions from waste incineration flue gas is to add an SCR denitrification system. However, adding an SCR denitrification device not only increases system resistance but also consumes a large amount of steam. In addition, the catalyst layer needs to be replaced regularly, and the replaced catalyst is hazardous waste that needs to be disposed of by a qualified professional manufacturer, which greatly increases investment and operating costs.

[0006] Therefore, it is necessary to develop a denitrification system that reduces investment and operating costs while achieving ultra-low NOx emissions. Summary of the Invention

[0007] The purpose of this invention is to provide an infrared temperature measurement and coordinated control system for deep denitrification of flue gas, which is a high-efficiency in-furnace denitrification system. It maximizes the efficiency of the denitrification system while minimizing investment and operating costs. The investment and operating costs are low, much lower than those of the SCR denitrification system, and it can achieve ultra-low NOx emissions.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: an infrared temperature measurement and coordinated control flue gas deep denitrification system, characterized in that it includes an infrared temperature measurement system, an SNCR denitrification system, and a PNCR denitrification system;

[0009] The infrared temperature measurement system is installed on the incinerator;

[0010] Both the SNCR and PNCR denitrification systems are located on the side wall of the incinerator;

[0011] The SNCR denitrification system includes an ammonia solution storage system, an ammonia solution dilution system, and an ammonia injection system. The ammonia solution storage system and the ammonia solution dilution system are both connected to the ammonia injection system. The SNCR denitrification system mainly consists of three parts: an ammonia solution storage system, an ammonia solution dilution system, and an injection system. Ammonia solution is injected into the furnace area with a temperature of 850℃~1000℃. The NH3 in the ammonia solution undergoes a selective non-catalytic reduction reaction with NOx in the flue gas to generate N2, thereby removing NOx from the flue gas.

[0012] The PNCR denitrification system comprises a PNCR denitrification storage system, a conveyor, and a denitrification injection system; these three systems are connected sequentially. The PNCR denitrification system mainly consists of a denitrification and storage system, and a conveyor and injection system. The denitrification agent uses a polymer material as a carrier, polymerizing and loading amino components onto the polymer material to form a powder. This powder is injected into the furnace through the conveyor system. At a high temperature of 750-1050℃, the chemical bonds at the junctions between the polymer carrier and the amino groups break, releasing a large amount of amino groups. These amino groups react with NOx in the flue gas to generate non-toxic and pollution-free nitrogen, carbon dioxide, and water, ultimately removing NOx from the flue gas.

[0013] In the above technical solution, the ammonia solution storage system includes an ammonia solution storage tank and an ammonia solution transfer pump;

[0014] The ammonia solution dilution system includes a dilution water storage tank and a dilution water transfer pump;

[0015] The ammonia solution storage tank, the ammonia solution transfer pump, and the ammonia injection system are connected in sequence.

[0016] The dilution water storage tank, dilution water transfer pump, and ammonia water injection system are connected in sequence.

[0017] In the above technical solution, the ammonia water injection system and the denitrification injection system are respectively connected to the compressed air system.

[0018] In the above technical solution, the ammonia injection system is set in the first reaction zone of the incinerator;

[0019] The denitrification injection system is located in the second reaction zone of the incinerator.

[0020] In the above technical solution, the temperature of the first reaction zone is 850℃~1000℃;

[0021] The temperature in the second reaction zone is 750-1050℃.

[0022] In the above technical solution, the ammonia water injection system includes multiple SNCR spray guns; the multiple SNCR spray guns are distributed around the first reaction zone, so that the arrangement of the SNCR spray guns covers the entire cross section of the furnace, achieving efficient denitrification and ultra-low emissions;

[0023] The denitrification injection system includes multiple PNCR denitrification spray guns; the multiple PNCR denitrification spray guns are distributed around the second reaction zone in pairs, vertically connected around the perimeter, so that the arrangement of the PNCR denitrification spray guns covers the entire cross section of the furnace, achieving efficient denitrification and ultra-low emissions.

[0024] In the above technical solution, the infrared temperature measurement system is installed at the top of the incinerator, above the SNCR and PNCR denitrification systems. The infrared temperature measurement system mainly consists of an optical system, a photoelectric detector, a signal amplifier, signal processing, and display output. Compared with conventional temperature field measurement methods, it has advantages such as high accuracy, short response time, non-contact operation, wide measurement range, real-time continuous measurement capability, and convenient maintenance.

[0025] The advantages of this utility model are mainly reflected in the following aspects:

[0026] (1) High efficiency denitrification; The infrared temperature measurement system in this utility model can continuously and accurately measure the temperature field inside the incinerator, accurately control the input of the denitrification system spray gun, improve denitrification efficiency and reduce ammonia escape.

[0027] (2) Achieve ultra-low emissions; This utility model can increase the NOx removal rate in flue gas to over 90%, ensuring stable ultra-low NOx emissions;

[0028] (3) Low investment cost; Compared with the SCR system, the equipment of this utility model is simple, occupies less space, is easy to maintain, and has a low investment cost.

[0029] (4) Low operating cost; This utility model does not require a heat exchanger, resulting in low system resistance, low energy consumption, and low operating cost.

[0030] (5) No hazardous waste is generated; This utility model does not require the setting of a fixed catalyst layer, so no hazardous waste is generated;

[0031] (6) High reliability; In the event of a failure in the SNCR denitrification system, the PNCR denitrification system can still achieve ultra-low NOx emissions without shutting down the furnace, and the system has high reliability. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the in-furnace deep denitrification system of this utility model.

[0033] Figure 2 This is a schematic diagram of the SNCR spray gun arrangement in this utility model.

[0034] Figure 3 This is a schematic diagram of the PNCR denitrification spray gun arrangement in this utility model.

[0035] In the diagram, 1-infrared temperature measurement system, 2-ammonia solution storage tank, 3-ammonia solution transfer pump, 4-dilution water storage tank, 5-dilution water transfer pump, 6-ammonia water injection system, 6.1-SNCR spray gun, 7-PNCR denitrification storage system, 8-jet blower, 9-PNCR spray gun, 9.1-PNCR denitrification spray gun, 10-incinerator, 10.1-first reaction zone, 10.2-second reaction zone, 11-compressed air system 1. Detailed Implementation

[0036] The following detailed description, in conjunction with the accompanying drawings, illustrates the implementation of this utility model. However, these descriptions do not constitute a limitation of the present utility model and are merely illustrative. Furthermore, the advantages of this utility model will become clearer and easier to understand through this description.

[0037] As shown in the attached figures: an infrared temperature measurement-coordinated control system for deep denitrification of flue gas includes an infrared temperature measurement system 1, an SNCR denitrification system, and a PNCR denitrification system;

[0038] Infrared temperature measurement system 1 is installed on incinerator 10;

[0039] Both the SNCR and PNCR denitrification systems are located on the side wall of incinerator 10;

[0040] The SNCR denitrification system includes an ammonia solution storage system, an ammonia solution dilution system, and an ammonia injection system 6; the ammonia solution storage system and the ammonia solution dilution system are both connected to the ammonia injection system 6.

[0041] The PNCR denitrification system includes a PNCR denitrification storage system 7, a conveyor 8, and a denitrification injection system 9; the conveyor, the PNCR denitrification storage system 7, and the denitrification injection system 9 are connected in sequence (e.g., Figure 1 (As shown).

[0042] Furthermore, the ammonia solution storage system includes an ammonia solution storage tank 2 and an ammonia solution transfer pump 3;

[0043] The ammonia solution dilution system includes a dilution water storage tank 4 and a dilution water transfer pump 5;

[0044] Ammonia solution storage tank 2, ammonia solution transfer pump 3, and ammonia injection system 6 are connected in sequence;

[0045] The dilution water storage tank 4, the dilution water transfer pump 5, and the ammonia water injection system 6 are connected in sequence (e.g., Figure 1 (As shown).

[0046] Furthermore, the ammonia injection system 6 and the denitrification injection system 9 are respectively connected to the compressed air system 11 (e.g., Figure 1 (As shown).

[0047] Furthermore, the ammonia injection system 6 is installed in the first reaction zone 10.1 of the incinerator 10;

[0048] The denitrification injection system 9 is installed in the second reaction zone 10.2 of the incinerator 10 (e.g., Figure 1 (As shown).

[0049] Furthermore, the temperature of the first reaction zone 10.1 is 850℃~1000℃;

[0050] The temperature of the second reaction zone 10.2 is 750-1050℃.

[0051] Furthermore, the ammonia injection system 6 includes multiple SNCR spray guns 6.1; the multiple SNCR spray guns 6.1 are distributed around the first reaction zone 10.1;

[0052] The denitrification injection system 9 includes multiple PNCR denitrification spray guns 9.1; the multiple PNCR denitrification spray guns 9.1 are distributed around the second reaction zone 10.2 (e.g., Figure 2 (As shown).

[0053] Furthermore, the infrared temperature measurement system 1 is installed at the top of the incinerator 10 and above the SNCR denitrification system and the PNCR denitrification system (e.g., Figure 3 (As shown).

[0054] Compared to the traditional SNCR+SCR denitrification system, the infrared temperature measurement and coordinated control flue gas deep denitrification system of this invention utilizes the infrared temperature measurement system 1 to accurately measure the temperature field inside the furnace, and accurately control the SNCR and PNCR denitrification systems to spray the denitrification agent into the appropriate area of ​​the incinerator 10, thereby improving the utilization efficiency of the denitrification agent and reducing ammonia escape. The arrangement of the SNCR spray gun 6.1 and the NCR denitrification spray gun 9.1 covers the entire cross-section of the furnace of the incinerator 10, achieving efficient denitrification and ultra-low emissions.

[0055] The working process of the infrared temperature measurement and coordinated control flue gas deep denitrification system of this utility model is as follows: The infrared temperature measurement system 1 accurately measures the temperature field of the furnace. After data analysis, the corresponding SNCR spray gun 6.1 (i.e., SNCR dual-fluid spray gun) and PNCR denitrification spray gun 9.1 are activated in the reaction temperature range. The ammonia solution delivery pump 3 delivers 25% ammonia solution from the ammonia solution storage tank 2 to the SNCR spray gun 6.1 (i.e., SNCR dual-fluid spray gun). During this period, the dilution water delivery pump 5 uses demineralized water in the dilution water storage tank 4 to dilute the 25% ammonia solution to about 10%. The ammonia solution is then atomized and sprayed into the furnace of the incinerator 10 by the compressed air through the compressed air system 11. The conveyor 8 (i.e., the jet blower) delivers the polymer denitrification agent from the PNCR denitrification storage system 7 (and denitrification agent chamber) to the PNCR denitrification spray gun 9.1. The polymer denitrification agent is then sprayed into the furnace of the incinerator 10 by the compressed air through the compressed air system 11. Under high temperature conditions, NH3 in ammonia water and amino groups formed by the breakdown of polymeric denitrification agents react with NOx in flue gas to generate N2, thereby achieving the purpose of removing NOx.

[0056] The above description is merely one specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0057] All other unspecified parts belong to the prior art.

Claims

1. An infrared temperature measurement cooperative control flue gas deep denitration system, characterized in that: Including an infrared temperature measurement system (1), an SNCR denitrification system, and a PNCR denitrification system; An infrared temperature measurement system (1) is installed on the incinerator (10); Both the SNCR and PNCR denitrification systems are located on the side wall of the incinerator (10); The SNCR denitrification system includes an ammonia solution storage system, an ammonia solution dilution system, and an ammonia injection system (6); the ammonia solution storage system and the ammonia solution dilution system are both connected to the ammonia injection system (6); The PNCR denitrification system includes a PNCR denitrification storage system (7), a conveyor (8), and a denitrification injection system (9); the conveyor, the PNCR denitrification storage system (7), and the denitrification injection system (9) are connected in sequence.

2. The infrared temperature measurement and collaborative control flue gas deep denitration system according to claim 1, characterized in that: The ammonia solution storage system includes an ammonia solution storage tank (2) and an ammonia solution transfer pump (3); The ammonia solution dilution system includes a dilution water storage tank (4) and a dilution water transfer pump (5); The ammonia solution storage tank (2), the ammonia solution transfer pump (3), and the ammonia injection system (6) are connected in sequence; The dilution water storage tank (4), the dilution water transfer pump (5), and the ammonia water injection system (6) are connected in sequence.

3. The infrared temperature measurement and collaborative control flue gas deep denitration system according to claim 1 or 2, characterized in that: The ammonia injection system (6) and the denitrification injection system (9) are respectively connected to the compressed air system (11).

4. The infrared temperature measurement and collaborative control flue gas deep denitration system according to claim 3, characterized in that: The ammonia injection system (6) is installed in the first reaction zone (10.1) of the incinerator (10); The denitrification injection system (9) is located in the second reaction zone (10.2) of the incinerator (10).

5. The infrared temperature measurement and collaborative control flue gas deep denitration system according to claim 4, characterized in that: The temperature of the first reaction zone (10.1) is 850℃~1000℃; The temperature of the second reaction zone (10.2) is 750-1050℃.

6. The infrared temperature measurement and collaborative control flue gas deep denitration system according to claim 5, characterized in that: The ammonia injection system (6) includes multiple SNCR spray guns (6.1); the multiple SNCR spray guns (6.1) are distributed around the first reaction zone (10.1); The denitrification spray system (9) includes multiple PNCR denitrification spray guns (9.1); the multiple PNCR denitrification spray guns (9.1) are distributed around the second reaction zone (10.2).

7. The infrared thermometry-coordinated control system for deep denitrification of flue gas according to claim 6, characterized in that: The infrared temperature measurement system (1) is installed on top of the incinerator (10) and above the SNCR denitrification system and the PNCR denitrification system.

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