Novel titanium slag system matched steam boiler denitration equipment

Abstract

The utility model relates to the technical field of flue gas denitration, in particular to novel steam boiler denitration equipment matched with a titanium slag system. The system comprises a boiler body, a flue gas pipeline and an SCR reactor, the boiler body is connected with the SCR reactor through the flue gas pipeline, a urea injection device is arranged on the flue gas pipeline at an outlet of the boiler body, and the urea injection device is provided with a plurality of groups of urea spray guns which are uniformly distributed in the flue gas pipeline at the outlet of the boiler body. According to the equipment, a traditional mode of spraying urea solution at the top of the boiler is changed into a mode of installing the urea spray gun at the bottom outlet of the boiler, the problem of low boiler heat efficiency caused by crystal substances formed by combination of the urea solution and impurities is solved, under the same burner load, the temperature of the boiler outlet is reduced by 60-100 DEG C, the blowing-out time is shortened, and urea reacts with flue gas more fully and effectively; the urea utilization rate is improved, the urea consumption is reduced by about 1-2kg / t, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas denitration technical field, concretely relates to a novel titanium slag system supporting steam boiler denitration equipment. BACKGROUND

[0002] At present, the flue gas denitration of the steam boiler matched with the titanium slag electric furnace is mainly through the way of spraying urea solution into the hearth, using high temperature environment to promote the reaction of NOx (nitrogen oxide) in the flue gas and urea to generate nitrogen and water, so as to achieve the purpose of reducing NOx emission.

[0003] However, in actual operation, the urea solution sprayed in the furnace is easy to chemically react or physically mix with the dust, fly ash and other impurities in the coal gas, forming crystalline substances that are difficult to remove. These crystalline substances not only adhere to the outer wall of the boiler pipeline, causing a significant decrease in heat transfer efficiency and affecting the heat exchange effect, but also cause the outlet temperature of the boiler to abnormally rise, up to 410 DEG C. This not only increases energy consumption, but also threatens the safe and stable operation of the equipment.

[0004] At the same time, in order to maintain the equipment, it is necessary to stop the furnace for about 20 to 30 hours per month for internal dust cleaning, which not only increases the annual maintenance cost, including labor and material cost, but also prolongs the production downtime, shortens the normal operation period of the boiler between two overhauls, and affects the continuity and economic benefit of production. SUMMARY

[0005] The utility model aims at providing a novel titanium slag system supporting steam boiler denitration equipment to solve the problem of low boiler thermal efficiency caused by the combination of urea solution and impurities to form crystalline substances in the prior art.

[0006] To achieve the above-mentioned purpose, a novel titanium slag system supporting steam boiler denitration equipment is provided, comprising a boiler body, a flue gas pipeline and an SCR reactor, the boiler body is connected with the SCR reactor through the flue gas pipeline, and the flue gas pipeline at the outlet of the boiler body is provided with a urea injection device, wherein:

[0007] The urea injection device is provided with a plurality of urea spray guns, and the plurality of urea spray guns are uniformly distributed in the flue gas pipeline at the outlet of the boiler body.

[0008] As a further improvement of the technical solution, the urea spray gun is connected to the main conveying pipe through the distribution pipe, and the main conveying pipe is connected to the storage tank.

[0009] As a further improvement of the technical solution, a flow meter, a flow regulating valve and a manual ball valve are sequentially arranged on the distribution pipe close to the direction of the urea spray gun, and a total valve is arranged on the main conveying pipe.

[0010] As a further improvement of the technical solution, the automatic control system is further provided with a controller, and the flow meter, the flow regulating valve and the urea injection gun are electrically connected with the controller.

[0011] As a further improvement of the technical solution, the flue gas pipeline at the outlet of the boiler body is further provided with a temperature sensor and a heating device, and the temperature sensor and the heating device are electrically connected with the controller.

[0012] As a further improvement of the technical solution, the SCR reactor is internally provided with multiple layers of catalysts.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] 1. In the new titanium slag system supporting steam boiler denitration equipment, the traditional urea solution spraying at the top of the furnace is replaced by the urea injection gun installed at the bottom outlet of the boiler, and the use of the existing urea injection gun in the furnace is stopped, thereby solving the problem of low boiler thermal efficiency caused by the combination of urea solution and impurities to form crystalline substances. After the urea injection gun is transformed, under the same burner load, the outlet temperature of the boiler is reduced by 60-100℃, because the new injection gun installation method avoids the combination of urea solution and dust and impurities in the coal gas on the outer wall of the boiler pipeline to form crystalline substances, thereby greatly reducing the generation of boiler pipe wall attachments, and further shortening the shutdown time caused by the problem of ash accumulation.

[0015] 2. In the new titanium slag system supporting steam boiler denitration equipment, the new injection gun installation method makes the reaction of urea and flue gas more sufficient and effective, improves the utilization rate of urea, thereby reducing the amount of urea by about 1-2 kg / t under the condition of achieving the same denitration effect. This directly reduces the consumption cost of urea, and further reduces the overall production cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a schematic diagram of the overall structure of the present application;

[0017] Fig. 2 It is a schematic diagram of the structure of the urea injection device of the present application.

[0018] The meanings of the various reference numerals in the drawings are as follows:

[0019] 1. Boiler body; 2. Flue gas pipeline; 3. Urea injection device; 31. Urea injection gun; 32. Flow meter; 33. Flow regulating valve; 34. Manual ball valve; 35. Total valve; 36. Storage tank; 37. Distribution pipe; 38. Main conveying pipe; 4. SCR reactor; 41. Catalyst. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0021] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot 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" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited. Embodiments

[0023] Please refer to Figs. 1-2 The present embodiment aims to provide a new type of titanium slag system supporting steam boiler denitration equipment, which includes a boiler body 1, a flue gas pipeline 2, and an SCR reactor 4. A urea injection device 3 is arranged at the flue gas pipeline 2 at the outlet of the boiler body 1.

[0024] The boiler body 1 is the core part of the entire system, responsible for generating steam and discharging flue gas containing NOx. The flue gas is guided to the SCR reactor 4 through the flue gas pipeline 2, and in this process, the urea injection device 3 processes the flue gas at the outlet of the boiler body 1. This design changes the traditional way of spraying urea solution from the top of the furnace, effectively avoiding the combination of urea solution with dust, fly ash and other impurities in the flue gas to form crystalline substances that are difficult to remove. These problems in the original system can cause a decrease in heat transfer efficiency, affect the heat exchange effect, and even cause the outlet temperature of the boiler to abnormally rise, threatening the safe and stable operation of the equipment.

[0025] The urea injection device 3 is provided with multiple groups of urea injection guns 31, which are uniformly distributed in the flue gas duct 2 at the outlet of the boiler body 1. The installation position of the urea injection guns 31 enables the urea solution to mix with the flue gas rapidly after entering the flue gas duct 2, reducing the opportunity for the urea solution to come into contact with impurities, thereby significantly reducing the generation of boiler pipe wall deposits. At the same time, the reaction of urea with flue gas is more complete and effective, improving the utilization rate of urea, thereby reducing the amount of urea used while achieving the same denitration effect, saving about 1-2 kg / t.

[0026] The controller adjusts the flow rate by using a PID (Proportional-Integral-Derivative) control algorithm based on the real-time flow data provided by the flow meter 32. When the flow rate detected by the flow meter 32 deviates from the preset value, the controller immediately adjusts the opening of the flow regulating valve 33 to restore it to the set flow rate range. For example, if the flow rate is detected to be too low, the controller will increase the opening of the flow regulating valve 33, and vice versa. This ensures that the flow rate of the urea solution is always maintained within the optimal range, typically 100-200 L / h, to meet the denitration needs under different working conditions.

[0027] In addition, the controller is also electrically connected to the urea injection guns 31, which can dynamically adjust the working state of the urea injection guns 31 according to changes in flue gas flow and NOx concentration. For example, when the flue gas flow increases or the NOx concentration rises, the controller will increase the injection frequency or amount of the urea injection guns 31, and vice versa. This process is achieved through pre-set control logic and algorithms, ensuring sufficient mixing and reaction of urea and flue gas, and improving denitration efficiency.

[0028] To further optimize the urea injection process, the flue gas duct 2 at the outlet of the boiler body 1 is also equipped with a temperature sensor and a heating device, both of which are connected to the controller to monitor and adjust the flue gas temperature. The flue gas temperature can be adjusted according to actual conditions to maintain it between 300°C and 400°C, which is the optimal temperature range for the reaction of urea with NOx.

[0029] The SCR reactor 4 is internally configured with multiple layers of catalysts 41, which are essential for promoting the chemical reaction between NOx and urea, significantly improving denitration efficiency.

[0030] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A new type of titanium slag system matching steam boiler denitration equipment, characterized in that: The device comprises a boiler body (1), a flue gas pipeline (2) and an SCR reactor (4), the boiler body (1) is connected with the SCR reactor (4) through the flue gas pipeline (2), the flue gas pipeline (2) at the outlet of the boiler body (1) is provided with a urea injection device (3), wherein: The urea injection device (3) is provided with a plurality of groups of urea injection guns (31), and the plurality of groups of urea injection guns (31) are uniformly distributed in the flue gas pipeline (2) at the outlet of the boiler body (1).

2. The new type of titanium slag system matched with a steam boiler denitration equipment according to claim 1, characterized in that: The urea injection gun (31) is connected to a main conveying pipe (38) through a distribution pipe (37), and the main conveying pipe (38) is connected to a storage tank (36).

3. The new type of titanium slag system matched with a steam boiler denitration equipment according to claim 2, characterized in that: A flow meter (32), a flow regulating valve (33) and a manual ball valve (34) are sequentially arranged on the distribution pipe (37) in the direction close to the urea injection gun (31), and a total valve (35) is arranged on the main conveying pipe (38).

4. The new type of titanium slag system matched with a steam boiler denitration equipment according to claim 3, characterized in that: An automatic control system is further included, the automatic control system is provided with a controller, and the flow meter (32), the flow regulating valve (33) and the urea injection gun (31) are electrically connected with the controller.

5. The new type of titanium slag system matched with a steam boiler denitration equipment according to claim 4, characterized in that: The flue gas pipeline (2) at the outlet of the boiler body (1) is further provided with a temperature sensor and a heating device, and the temperature sensor and the heating device are electrically connected with the controller.

6. The new type of titanium slag system matched steam boiler denitration equipment according to claim 1, characterized in that: The SCR reactor (4) is internally provided with a plurality of layers of catalysts (41).

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