SCR (Selective Catalytic Reduction) catalyst protection device for boiler flue gas treatment

Abstract

The utility model discloses an SCR (Selective Catalytic Reduction) catalyst protection device for boiler flue gas treatment, which belongs to the technical field of boiler flue gas treatment and comprises a boiler flue, a mounting plate is arranged in the boiler flue, a plurality of SCR catalyst modules are arranged in the mounting plate, a steam soot blower is arranged on one side of the boiler flue, and a plurality of SCR catalyst modules are arranged on the other side of the boiler flue. Air guide pipes are symmetrically arranged in the steam soot blower, a plurality of air outlet holes are evenly formed in the upper end and the lower end of each air guide pipe, a positioning and collecting assembly is arranged on the side, away from the steam soot blower, of the boiler flue, and a grating filter screen is arranged at the upper end of one side of the positioning and collecting assembly. The air outlet holes are formed in the upper end and the lower end of the air guide pipe, so that the grating filter screen can be continuously cleaned, blocked dust and impurities are ensured to enter the collecting box to be stored, and meanwhile, pores of a catalyst can be purged, so that internal blockages are reduced, the effective contact area of reactants and the catalyst is increased, and the flue gas denitration efficiency is ensured; the equipment operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of boiler flue gas treatment technology, and specifically relates to an SCR catalyst protection device for boiler flue gas treatment. BACKGROUND

[0002] In the boiler flue gas treatment process, in order to realize the standard discharge of nitrogen oxides in flue gas, the selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) combined denitration technology is usually adopted, and the SCR device is usually arranged in the boiler flue for use.

[0003] Due to the complex composition of flue gas inside the boiler flue and the large amount of dust contained therein, in the actual operation process, the impurities such as coke blocks and castable particles carried in the flue gas are prone to block the pore structure of the SCR catalyst, and the conventional soot blowing equipment cannot effectively remove such blockages, so that the SCR catalyst will be seriously blocked in a short period of time, which will reduce the denitration efficiency, increase the power consumption during the operation of the boiler, and also significantly shorten the operation cycle of the boiler. UTILITY MODEL CONTENTS

[0004] To solve the problems raised in the above background technology, the utility model provides an SCR catalyst protection device for boiler flue gas treatment, which has the characteristics of long catalyst service life and low energy consumption.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an SCR catalyst protection device for boiler flue gas treatment, comprising a boiler flue, an installation plate is arranged inside the boiler flue, a plurality of SCR catalyst modules are arranged inside the installation plate, a steam soot blower is arranged on one side of the boiler flue, a gas guide pipe is symmetrically arranged inside the steam soot blower, a plurality of gas outlets are uniformly arranged on the upper and lower ends of the gas guide pipe, a positioning and collecting assembly is arranged on the side of the boiler flue away from the steam soot blower, and a grating filter screen is arranged on the upper end of one side of the positioning and collecting assembly.

[0006] Preferably, the positioning and collecting assembly comprises a positioning seat, a limiting spring, a collecting box, a slag discharge device, a support frame, a pull rod, a guide rod, a positioning plug and a plug-in rod, wherein the collecting box is arranged on one side of the boiler flue, the slag discharge device is arranged at the bottom end inside the collecting box, the support frame is arranged in the middle of the inside of the collecting box, the pull rod is arranged inside the support frame, the positioning plug is arranged at one end of the pull rod, the guide rod is arranged inside the upper end of the positioning plug, the limiting spring is sleeved on the surface of the guide rod, the positioning seat is arranged at one end of the support frame, and the plug-in rod is arranged in the middle of the inside of the grating filter screen corresponding to the positioning seat.

[0007] Preferably, a lifting hole is arranged in the upper end of the plug-in rod, and a limiting ring is arranged on the bottom end surface of the plug-in rod corresponding to the positioning seat.

[0008] Preferably, the pull rod is internally provided with a pull ring, and the support frame is internally provided with a movable slot corresponding to the pull rod and the positioning plug.

[0009] Preferably, the boiler flue and the collecting box are internally provided with a slag discharge groove corresponding to the bottom end of the grid filter.

[0010] Preferably, the slag discharging device comprises a dust baffle, an abutting block, a limiting baffle, a damping rotating shaft and a fixing shaft, the collecting box is internally provided with the fixing shaft, the surface of the fixing shaft is provided with the dust baffle, the bottom end of the collecting box is internally provided with the damping rotating shaft, one side of the damping rotating shaft is provided with the limiting baffle, and the collecting box is internally provided with the abutting block corresponding to the dust baffle.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1、The positioning and collecting assembly is arranged, so that the grid filter can be conveniently positioned and installed, the stability and convenience of the grid filter installation are improved, the use strength of the equipment is ensured, the installation efficiency is improved, the collected dust and impurities can be conveniently cleaned, the collection effect of the equipment is improved, the convenience in use is ensured, and human resources are saved.

[0013] 2、The utility model discloses a gas outlet is arranged on the upper end and the lower end of the air guide pipe, so that the grid filter can be continuously cleaned, the dust and impurities are prevented from entering the collecting box and being stored, the catalyst pores can be swept, the internal blockage is reduced, the effective contact area of the reactant and the catalyst is improved, the flue gas denitration efficiency is ensured, the equipment operation cost is reduced, and the flow resistance when the flue gas passes through is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural side view of the utility model;

[0016] Figure 3 It is a structural schematic view of the positioning and collecting assembly of the utility model;

[0017] Figure 4 It is a structural schematic view of the slag discharging device of the utility model.

[0018] In the figure: 1, boiler flue; 2, positioning collection assembly; 21, positioning seat; 22, limit spring; 23, collection box; 24, deslagging device; 241, dust baffle; 242, abutting block; 243, limit baffle; 244, damping rotating shaft; 245, fixed shaft; 25, support frame; 26, pull rod; 27, guide rod; 28, positioning plug; 29, plug-in rod; 3, mounting plate; 4, SCR catalyst module; 5, air outlet hole; 6, air guide pipe; 7, steam sootblower; 8, grid filter screen. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] Please refer to Figures 1-4 The utility model provides the following technical scheme: a kind of SCR catalyst protection device for boiler flue gas treatment, including boiler flue 1, the inside of boiler flue 1 is provided with mounting plate 3, the inside of mounting plate 3 is provided with several SCR catalyst modules 4, one side of boiler flue 1 is provided with steam sootblower 7, steam sootblower 7 is provided with air guide pipe 6 in symmetry in the inside, the upper and lower ends of air guide pipe 6 are evenly provided with several air outlet holes 5, one side of boiler flue 1 away from steam sootblower 7 is provided with positioning collection assembly 2, and the upper end of one side of positioning collection assembly 2 is provided with grid filter screen 8.

[0021] Specifically, positioning collection assembly 2 includes positioning seat 21, limit spring 22, collection box 23, deslagging device 24, support frame 25, pull rod 26, guide rod 27, positioning plug 28 and plug-in rod 29, wherein, one side of boiler flue 1 is provided with collection box 23, the inside bottom end of collection box 23 is provided with deslagging device 24, the inside middle of collection box 23 is provided with support frame 25, the inside of support frame 25 is provided with pull rod 26, one end of pull rod 26 is provided with positioning plug 28, the upper end inside of positioning plug 28 is provided with guide rod 27, and the surface of guide rod 27 is sleeved with limit spring 22, one end of support frame 25 is provided with positioning seat 21, and the inside middle of grid filter screen 8 is provided with plug-in rod 29 corresponding to positioning seat 21.

[0022] By adopting the above technical scheme, the SCR catalyst module 4 is hoisted into the inside of the boiler flue 1 and installed corresponding to the mounting plate 3, then the air guide pipe 6 is connected to the exhaust end of the steam soot blower 7 and inserted into the inside of the boiler flue 1 for use, finally the grid filter screen 8 is installed, the plug-in rod 29 in the middle of the grid filter screen 8 is plugged into the corresponding positioning seat 21, and the pull rod 26 is pulled to drive the positioning plug 28 to slide along the guide rod 27 and make the limiting spring 22 be stressed and compressed, when the limiting stop ring on the surface of the plug-in rod 29 abuts against the upper end of the positioning seat 21, the pull rod 26 is loosened to make the limiting spring 22 reset, at this time the positioning plug 28 is inserted into the inside of the plug-in rod 29 to fix the grid filter screen 8, ensuring the convenience and stability of the installation of the grid filter screen 8.

[0023] Specifically, the inside of the upper end of the plug-in rod 29 is provided with a hoisting hole, and the bottom end surface of the plug-in rod 29 is provided with a limiting stop ring corresponding to the positioning seat 21.

[0024] By adopting the above technical scheme, the accuracy and stability of the installation of the grid filter screen 8 are ensured, and the convenience of disassembly and assembly of the grid filter screen 8 is improved.

[0025] Specifically, the inside of the pull rod 26 is provided with a pull ring, and the inside of the support frame 25 is provided with a movable slot corresponding to the pull rod 26 and the positioning plug 28.

[0026] By adopting the above technical scheme, the convenience of adjustment of the pull rod 26 is ensured, the stability of movement of the pull rod 26 is ensured, and the use effect is ensured.

[0027] Specifically, the bottom end of the grid filter screen 8 is provided with a slag discharge groove corresponding to the boiler flue 1 and the collecting box 23.

[0028] By adopting the above technical scheme, the dust and impurities blocked by the grid filter screen 8 can be conveniently accumulated at the bottom end, and the dust and impurities can be conveniently collected into the collecting box 23.

[0029] Specifically, the slag discharge device 24 includes a dust blocking plate 241, an abutting block 242, a limiting baffle 243, a damping rotating shaft 244 and a fixed shaft 245, wherein the inside of the collecting box 23 is provided with the fixed shaft 245 penetrating through, the surface of the fixed shaft 245 is provided with the dust blocking plate 241, the middle of the bottom end of the collecting box 23 is provided with the damping rotating shaft 244, one side of the damping rotating shaft 244 is provided with the limiting baffle 243, and the inside of the collecting box 23 is provided with the abutting block 242 corresponding to the dust blocking plate 241.

[0030] By adopting the above technical scheme, when it is needed to discharge and clean the dust collected in the collecting box 23, the limiting baffle 243 is rotated along the damping rotating shaft 244 so as to no longer block the dust baffle 241, then the dust baffle 241 is rotated along the fixed shaft 245 to be opened, at this time, the dust accumulated in the collecting box 23 can be treated, the use quality of the equipment is ensured, and the flue gas treatment quality is improved.

[0031] The steam soot blower 7 in the utility model is a prior art disclosed, and the selected model is DS+EHS3000MM.

[0032] The working principle and use process of the utility model: when the utility model is used, during the boiler flue gas treatment, the reduction reaction between ammonia and nitrogen oxides needs to be catalyzed by the SCR catalyst module 4 installed in the inside of the boiler flue 1, harmful nitrogen oxides are converted into harmless nitrogen and water through the reduction reaction, so that the purpose of denitration is realized, and the emission of atmospheric pollutants is reduced; the SCR catalyst module 4 usually adopts vanadium pentoxide as an active component, and is mixed with tungsten trioxide and molybdenum trioxide to improve the thermal stability of the catalyst, and titanium dioxide is used as a carrier material.

[0033] The SCR catalyst module 4 is hoisted to the inside of the boiler flue 1 and is installed in correspondence with the mounting plate 3, then the air guide pipe 6 is connected to the exhaust end of the steam soot blower 7 and is inserted into the inside of the boiler flue 1 for use, finally, the grid filter screen 8 is installed, the plug-in rod 29 in the middle of the grid filter screen 8 is plugged into the corresponding positioning seat 21, and the pull rod 26 is pulled to drive the positioning plug block 28 to slide along the guide rod 27 and make the limiting spring 22 compress under stress; when the limiting stop ring on the surface of the plug-in rod 29 abuts against the upper end of the positioning seat 21, the pull rod 26 is loosened to make the limiting spring 22 reset, at this time, the positioning plug block 28 is inserted into the inside of the plug-in rod 29 to fix the grid filter screen 8, the convenience and stability of the installation of the grid filter screen 8 are ensured, and when the SCR catalyst module 4 is used, the impurities such as coke blocks and castable particles carried in the flue gas are filtered and blocked by the grid filter screen 8, the grid filter screen 8 can be opened for work, the airflow is blown out from the air outlet hole 5 opened in the inner wall of the air guide pipe 6, the airflow goes upward to make the dust enter the collecting box 23 along the grid filter screen 8 for collection, and the airflow goes downward to blow and sweep the pores of the SCR catalyst module 4, so that the internal blockage is reduced and the catalytic efficiency is improved.

[0034] When it is needed to discharge and clean the dust collected in the collecting box 23, the limiting baffle 243 is rotated along the damping rotating shaft 244 so as to no longer block the dust baffle 241, then the dust baffle 241 is rotated along the fixed shaft 245 to be opened, at this time, the dust accumulated in the collecting box 23 can be treated, the use quality of the equipment is ensured, and the flue gas treatment quality is improved.

[0035] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for protecting an SCR catalyst from the flue gases of a boiler, comprising a flue gas duct (1) of a boiler, characterized in that: The inside of the boiler flue (1) is provided with a mounting plate (3), the inside of the mounting plate (3) is provided with a plurality of SCR catalyst modules (4), one side of the boiler flue (1) is provided with a steam soot blower (7), the inside of the steam soot blower (7) is symmetrically provided with an air guide pipe (6), a plurality of air outlets (5) are uniformly arranged on the upper and lower ends of the air guide pipe (6), and one side of the boiler flue (1) away from the steam soot blower (7) is provided with a positioning and collecting assembly (2). The upper end of one side of the positioning and collecting assembly (2) is provided with a grating filter screen (8).

2. A protective device for SCR catalysts for the treatment of flue gases from boilers according to claim 1, characterized in that: The positioning and collecting assembly (2) comprises a positioning seat (21), a limiting spring (22), a collecting box (23), a deslagging device (24), a support frame (25), a pull rod (26), a guide rod (27), a positioning plug (28) and a plug-in rod (29), wherein one side of the boiler flue (1) is provided with the collecting box (23), the inside bottom end of the collecting box (23) is provided with the deslagging device (24), the inside middle of the collecting box (23) is provided with the support frame (25), the inside of the support frame (25) is provided with the pull rod (26), one end of the pull rod (26) is provided with the positioning plug (28), the upper end inside of the positioning plug (28) is provided with the guide rod (27), the surface of the guide rod (27) is sleeved with the limiting spring (22), one end of the support frame (25) is provided with the positioning seat (21), and the inside middle of the grating filter screen (8) is provided with the plug-in rod (29) corresponding to the positioning seat (21).

3. A protective device for SCR catalysts for the treatment of flue gases from boilers according to claim 2, characterized in that: The upper end inside of the plug-in rod (29) is provided with a lifting hole, and the bottom end surface of the plug-in rod (29) is provided with a limiting stop ring corresponding to the positioning seat (21).

4. A protective device for SCR catalysts for the treatment of flue gases from boilers according to claim 2, characterized in that: The inside of the pull rod (26) is provided with a pull ring, and the inside of the support frame (25) is provided with a movable groove corresponding to the pull rod (26) and the positioning plug (28).

5. A protective device for SCR catalysts for the treatment of flue gases from boilers according to claim 2, characterized in that: The bottom end of the grating filter screen (8) is provided with a deslagging groove corresponding to the grating filter screen (8) on one side of the boiler flue (1) and the collecting box (23).

6. A protective device for SCR catalysts for the treatment of flue gases from boilers according to claim 2, characterized in that: The deslagging device (24) comprises a dust baffle (241), an abutting block (242), a limiting baffle (243), a damping rotating shaft (244) and a fixed shaft (245), wherein the inside of the collecting box (23) is provided with the fixed shaft (245) penetrating through, the surface of the fixed shaft (245) is provided with the dust baffle (241), the bottom end middle of the collecting box (23) is provided with the damping rotating shaft (244), one side of the damping rotating shaft (244) is provided with the limiting baffle (243), and the inside of the collecting box (23) is symmetrically provided with the abutting block (242) corresponding to the dust baffle (241).

Images