A high temperature and wear resistant denitrification long spray gun

Abstract

The utility model discloses a high-temperature-resistant and wear-resistant denitrification long spray gun, comprising a sleeve, a plurality of gripping nails are welded on the outer surface of the sleeve, a refractory castable is coated on the outer side of the sleeve, a plurality of nozzles are arranged on the sleeve away from the flue gas side, the refractory castable is provided with holes for avoiding the nozzles at the nozzles, the sleeve support is fixed on a bracket, and the bracket is fixedly arranged on the furnace wall; the spray gun is directly installed in a high-temperature flue at a furnace outlet of 600-1000°C, and a reducing agent urea solution is directly pyrolyzed by high-temperature hot flue gas, thereby solving the problem of no heat source for pyrolysis of urea solution and saving the investment cost of additional heating device; by increasing the length of the spray gun, the problems of short spray distance and incomplete coverage of the short spray gun are solved; by coating the castable on the outer surface of the spray gun, the problem of high-temperature deformation of the solution of the long spray gun is solved; after the spray gun is used, the problem of substandard denitrification performance is solved, thereby bringing considerable economic benefits to the enterprise.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water heating chain boiler flue gas denitrification, and in particular to a high-temperature resistant and wear-resistant denitrification long spray gun. Background Art

[0002] As national environmental emission standards continue to rise, heating grate-type hot water boilers must adopt SCR (Selective Catalytic Reduction) denitrification technology to meet NOx emission standards. Traditionally, there are two methods for injecting urea solution: The first involves pyrolyzing the urea solution with hot air at 500-600°C, then injecting it into the catalyst inlet flue through an ammonia injection grid; the second involves injecting it directly into the furnace using a short lance. However, some grate-type hot water boilers lack hot air, and even with hot air, the temperature is only around 100°C. Pyrolysis of the urea solution requires additional heating equipment to heat the cold air to 500-600°C, increasing investment and operating costs.

[0003] At the same time, the cross-section of the furnace of the grate-type hot water boiler is relatively large, and the spraying distance is generally very short when using a short spray gun. Moreover, the high-temperature flue gas in the furnace or flue is instantly evaporated after the spray, so it cannot completely cover the entire furnace or flue. The main problems are low denitrification efficiency and high urea consumption, which ultimately lead to substandard denitrification NOx emission indicators, resulting in boiler shutdown and economic losses to the company. Utility Model Content

[0004] The purpose of the utility model is to provide a high-temperature resistant and wear-resistant denitrification long spray gun to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-temperature resistant and wear-resistant denitrification long spray gun, which includes a sleeve, a plurality of grabbing nails are welded on the outer surface of the sleeve, the outer side of the sleeve is coated with a refractory castable, a plurality of nozzles are arranged on the sleeve away from the flue gas side, the refractory castable is provided with holes at the nozzles to avoid the nozzles, the sleeve is supported and fixed on a bracket, and the bracket is fixed on the furnace wall.

[0006] Preferably, the long denitrification lance is directly arranged in the high-temperature flue at the furnace outlet.

[0007] Preferably, the sleeve is made of 310S material.

[0008] Preferably, one end of the sleeve is provided with inlets for reducing agent, atomizing air and cooling air.

[0009] Beneficial effects: Compared with the prior art, the beneficial effects of the utility model are as follows: the spray gun is directly installed in the high-temperature flue at the furnace outlet of 600-1000℃, and the reducing agent urea solution is directly pyrolyzed by the high-temperature hot flue gas, which solves the problem of no heat source for pyrolysis of urea solution and saves the investment cost of additional heating device; by increasing the length of the spray gun, the problems of short spray distance and incomplete coverage of the short spray gun are solved; by coating the outer surface of the spray gun with castable, the problem of high-temperature deformation of the solution of the long spray gun is solved; after the use of the spray gun, the problem of substandard denitrification performance is solved, which brings considerable economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the installation layout of the utility model.

[0011] Figure 2 It is the main view of the utility model.

[0012] Figure 3 for Figure 2 AA cross-sectional view.

[0013] In the accompanying drawings: 1- casing, 2- grab nail, 3- refractory castable, 4- nozzle, 5- bracket. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0015] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0016] Example

[0017] Referring to the accompanying drawings, in one embodiment of the present invention, a high-temperature, wear-resistant, and long denitrification lance comprises a sleeve 1 made of 310S material. Several gripping nails 2 are welded to the outer surface of the sleeve 1. The outer surface of the sleeve 1 is coated with a refractory castable 3. Several nozzles 4 are provided on the sleeve 1 facing away from the flue gas. The refractory castable 3 has holes at the nozzles 4 to allow for the nozzles 4 to pass through. The sleeve 1 is supported and fixed on a bracket 5, which is fixed to the furnace wall. One end of the sleeve 1 is provided with inlets for reducing agent, atomizing air, and cooling air.

[0018] The denitrification long spray gun is directly placed in the high-temperature flue at the furnace outlet of 600-1000℃, and the high-temperature hot flue gas is used to directly pyrolyze the reducing agent urea solution. Figure 1 It can be seen that the high-temperature flue can be arranged between the furnace outlet and the convection tube bundle, and only one position needs to be selected for arrangement.

[0019] Because the installation location can reach temperatures of 600-1000°C, the spray gun must be designed for high-temperature and wear resistance. The spray gun sleeve 1 is typically made of 310S material, but 310S softens and deforms at temperatures of 800-1000°C. Therefore, gripping pins 2 are welded tightly to the outer surface of the sleeve 1 to secure the refractory castable. Refractory castable 3 is then applied to the outer surface of the sleeve 1. Only after the castable 3 has hardened can the spray gun be moved and installed. Because the sleeve 1 is relatively long, it must be secured to a bracket 5, which can be fixed to the furnace wall before installation to provide support for the entire spray gun.

[0020] In the utility model, the spray gun is directly installed in the high-temperature flue at the outlet of the furnace at 600-1000℃, and the reducing agent urea solution is directly pyrolyzed by the high-temperature hot flue gas, which solves the problem of no heat source for the pyrolysis of urea solution and saves the investment cost of additional heating device; by increasing the length of the spray gun, the problems of short spray distance and incomplete coverage of the short spray gun are solved; by coating the outer surface of the spray gun with castable, the problem of high-temperature deformation of the solution of the long spray gun is solved; after the spray gun is used, the problem of substandard denitrification performance is solved, which brings considerable economic benefits to the enterprise; the application has a simple structure, strong practicality, and simple operation, which is worthy of promotion.

[0021] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

Claims

1. A high temperature and wear resistant denitrification long spray gun, characterized by: The invention comprises a sleeve (1), the outer surface of which is welded with a plurality of gripping nails (2), the outer side of which is coated with a refractory castable (3), a plurality of nozzles (4) being arranged on the sleeve (1) away from the flue gas side, the refractory castable (3) being provided with holes at the nozzles (4) for avoiding the nozzles (4), the sleeve (1) being supported and fixed on a bracket (5), and the bracket (5) being fixedly arranged on the furnace wall.

2. A high temperature resistant and wear resistant denitrification long spray gun according to claim 1, characterized in that: The long denitration lance is directly arranged in the high-temperature flue at the furnace outlet.

3. The high temperature and wear resistant denitrification long spray gun according to claim 1 is characterized in that: The material of the sleeve (1) is 310S material.

4. The high temperature and wear resistant denitrification long spray gun according to claim 1 is characterized in that: One end of the sleeve (1) is provided with inlets for reducing agent, atomizing air and cooling air.

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