Pre-dedusting device for selective catalytic reduction denitration system

Abstract

The utility model relates to the field of flue gas treatment of coal-fired power plants, and discloses a pre-dedusting device for a selective catalytic reduction denitration system, which comprises a filter part, a mounting plate, a linear walking mechanism, a soot blowing component and a soot collecting hopper. By arranging the filter part, coke blocks in the flue gas can be intercepted before the flue gas enters the SCR reactor; the soot blowing assembly is driven by the arranged linear walking mechanism to do linear reciprocating motion, and coke blocks intercepted on the filtering piece can be blown; the condition of large-area dust accumulation on the filter piece and a filter plate at the top of the SCR reactor can be avoided, abrasion and scouring of a catalyst are reduced, and the service life of the catalyst is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of smoke treatment in coal-fired power plants, in particular to a pre-dust removal device for a selective catalytic reduction denitration system. Background Art

[0002] Selective catalytic reduction technology is the mainstream denitrification method in coal-fired power plants. In order to improve the economy of the units, most power plants use high-alkali metal coal for blending. The blending of high-alkali coal is prone to cause coking of the boiler water-cooled wall. During the soot blowing process, after the coke blocks fall off the heating surface, some of the coke blocks will follow the flue gas to the SCR reactor. Although the filter on the top of the SCR reactor can intercept the coke blocks in the flue gas, as the amount of intercepted coke blocks increases, the fly ash in the flue gas will bond with the coke blocks, causing a large area of ​​ash accumulation on the surface of the filter; the ash accumulation has formed a large obstacle to the inflow of flue gas, increased the pressure in the flue, and significantly increased the local flue gas flow rate passing through the filter, aggravating the wear and erosion of the catalyst and reducing the service life of the catalyst. Utility Model Content

[0003] Based on the above problems, the purpose of the utility model is to provide a pre-dust removal device for a selective catalytic reduction denitration system to solve the problems existing in the above-mentioned prior art.

[0004] The utility model adopts the following technical solutions:

[0005] The utility model provides a pre-dust removal device for a selective catalytic reduction denitration system, comprising:

[0006] A filter element, wherein the filter element is arranged inside the vertical section of the flue;

[0007] A mounting plate, wherein the number of the mounting plates is two, and the two mounting plates are respectively arranged on both sides above the filter element and are respectively connected to the inner wall of the flue;

[0008] A linear walking mechanism, wherein the number of the linear walking mechanisms is two and they are respectively arranged on the corresponding mounting plates;

[0009] A sootblowing assembly, wherein the sootblowing assembly is located above the filter element, and both ends of the sootblowing assembly are respectively connected to the two linear travel mechanisms;

[0010] An ash collecting hopper is arranged at the bottom of the horizontal section of the flue and is correspondingly arranged below the filter element.

[0011] Furthermore, the linear travel mechanism includes an electric travel wheel, and the sootblowing assembly is connected to the electric travel wheel; a groove is provided on the top surface of the mounting plate along the length direction, and the electric travel wheel is movably connected to the mounting plate through the groove.

[0012] Furthermore, the electric walking wheel includes a wheel body, the bottom of which is movably engaged in the groove; the wheel body is rotatably connected to the wheel seat via a rotating shaft, and the sootblowing assembly is connected to the wheel seat; a rotating driving component is provided on the wheel seat, and the output shaft of the rotating driving component is dynamically connected to one end of the rotating shaft.

[0013] Furthermore, the sootblowing assembly includes a connecting rod, both ends of which are respectively connected to the corresponding wheel seats; and a plurality of sootblowers arranged at intervals are connected to the connecting rod.

[0014] Furthermore, a reducing agent nozzle is sealed and penetrated through the vertical section of the flue, and a plurality of branch pipes arranged at intervals are connected to the reducing agent nozzle, and the filter element is located above the branch pipe and connected to the branch pipe.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] The filter element is provided to intercept coke blocks in the flue gas before the flue gas enters the SCR reactor; the linear travel mechanism is provided to drive the soot blowing assembly to perform linear reciprocating motion, so as to blow away the coke blocks intercepted on the filter element; the large-area dust accumulation on the filter element and the filter plate on the top of the SCR reactor can be avoided, thereby reducing the wear and erosion of the catalyst and increasing the service life of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the installation of a pre-dust removal device for a selective catalytic reduction denitration system according to the utility model;

[0019] Figure 2 for Figure 1 Enlarged view of part A.

[0020] Explanation of the reference numerals: 1. filter element; 2. mounting plate; 3. linear travel mechanism; 31. electric travel wheel; 311. wheel body; 312. rotating shaft; 313. wheel seat; 314. rotating drive component; 32. groove; 4. ash hopper; 5. flue; 6. SCR reactor; 7. air preheater; 8. reducing agent nozzle; 81. branch pipe; 9. soot blowing assembly; 91. connecting rod; 92. soot blower. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-Figure 2 As shown, the present embodiment discloses a pre-dust removal device for a selective catalytic reduction denitrification system, including a filter element 1, which is arranged inside a vertical section of a flue 5. There are two mounting plates 2, which are respectively arranged on both sides above the filter element 1 and are respectively connected to the inner wall of the flue 5; there are two linear travel mechanisms 3, which are respectively arranged on corresponding mounting plates 2; a soot blowing assembly 9 is located above the filter element 1, and its two ends are respectively connected to the two linear travel mechanisms 3; an ash collecting hopper 4 is arranged at the bottom of the horizontal section of the flue 5, and is correspondingly arranged below the filter element 1.

[0023] In this embodiment, one end of the flue 5 is connected to the economizer outlet, the other end of the flue 5 is connected to the top inlet of the SCR reactor 6, and the bottom outlet of the SCR reactor 6 is connected to the air preheater 7; a plurality of plate catalysts are arranged at intervals in the upper and lower parts of the SCR reactor 6, and are all located below the top filter plate of the SCR reactor 6; the filter element 1 is configured as a filter screen, the filter element 1 and the mounting plate 2 are both horizontally arranged, and the mounting plate 2 is fixedly connected to the inner wall of the flue 5.

[0024] A reducing agent nozzle 8 is sealed and penetrated through the vertical section of the flue 5. One end of the reducing agent nozzle 8 is connected to the reducing agent supply device. The other end of the reducing agent nozzle 8 horizontally penetrates into the flue 5 and is fixedly connected to a plurality of branch pipes 81 arranged at intervals. The filter element 1 is located above the branch pipe 81 and is connected to the branch pipe 81 by welding. The reducing agent can be set to ammonia. The reducing agent supply device is a prior art, and its working principle and use method are known, which will not be repeated here.

[0025] The ash hopper 4 is used to collect the coke blocks intercepted by the filter element 1. An air lock and an ash discharge valve are installed at the lower part of the ash hopper 4 to regularly clean the coke blocks in the ash hopper 4. The air lock and the ash discharge valve are both prior arts, and their working principles and methods of use are known, which will not be repeated here.

[0026] By adopting this solution, the filter element 1 is provided to intercept the coke in the flue gas before the flue gas enters the SCR reactor 6; the linear travel mechanism 3 is provided to drive the soot blowing assembly 9 to perform linear reciprocating motion, so as to blow away the coke intercepted on the filter element 1; the large-area dust accumulation on the filter element 1 and the filter plate on the top of the SCR reactor 6 can be avoided, thereby reducing the wear and erosion of the catalyst and increasing the service life of the catalyst.

[0027] Further optimizing the scheme, the linear travel mechanism 3 includes an electric travel wheel 31, and the soot blowing assembly 9 is connected to the electric travel wheel 31; the top surface of the mounting plate 2 is provided with a groove 32 along the length direction, and the electric travel wheel 31 is movably connected to the mounting plate 2 through the groove 32. The electric travel wheel 31 drives the soot blowing assembly 9 to reciprocate above the filter element 1, so as to achieve the effect of blowing away the coke blocks intercepted on the filter element 1.

[0028] According to a further optimization scheme, the electric walking wheel 31 includes a wheel body 311, the bottom of which is movably engaged in the groove 32; the wheel body 311 is rotatably connected to the wheel seat 313 through the rotating shaft 312, and the soot blowing assembly 9 is connected to the wheel seat 313; a rotating driving component 314 is provided on the wheel seat 313, and the output shaft of the rotating driving component 314 is dynamically connected to one end of the rotating shaft 312.

[0029] In this embodiment, the rotary drive component 314 is configured as a motor, and the fixed end of the rotary drive component 314 is fixed to the wheel seat 313. The rotary drive component 314 drives the rotating shaft 312 to rotate, and the rotating shaft 312 drives the wheel body 311 to rotate, so as to achieve the effect of driving the soot blowing assembly 9 to perform linear motion.

[0030] According to a further optimized solution, the sootblowing assembly 9 includes a connecting rod 91 , both ends of which are fixedly connected to corresponding wheel seats 313 ; and a plurality of sootblowers 92 arranged at intervals are fixedly connected to the connecting rod 91 .

[0031] In this embodiment, the air outlet of the soot blower 92 is arranged downward, and the air outlet is located above the filter element 1. By making a plurality of soot blowers 92 perform linear reciprocating motion above the filter element 1, the coke blocks on the filter element 1 can be purged.

[0032] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A pre-dust removal device for a selective catalytic reduction denitration system, characterized in that: include: A filter element (1), the filter element (1) being arranged inside a vertical section of a flue (5); A mounting plate (2), wherein the number of the mounting plates (2) is two, and the two mounting plates (2) are respectively arranged on both sides above the filter element (1) and are respectively connected to the inner wall of the flue (5); A linear walking mechanism (3), wherein the number of the linear walking mechanisms (3) is two and they are respectively arranged on the corresponding mounting plates (2); A soot blowing assembly (9), the soot blowing assembly (9) is located above the filter element (1), and two ends of the soot blowing assembly (9) are respectively connected to the two linear travel mechanisms (3); An ash collecting hopper (4) is arranged at the bottom of the horizontal section of the flue (5) and is correspondingly arranged below the filter element (1).

2. The pre-dust removal device for a selective catalytic reduction denitration system according to claim 1, characterized in that: The linear travel mechanism (3) comprises an electric travel wheel (31), and the sootblowing assembly (9) is connected to the electric travel wheel (31); a groove (32) is provided on the top surface of the mounting plate (2) along the length direction, and the electric travel wheel (31) is movably connected to the mounting plate (2) via the groove (32).

3. The pre-dust removal device for the selective catalytic reduction denitration system according to claim 2, characterized in that: The electric walking wheel (31) comprises a wheel body (311), the bottom of which is movably engaged in the groove (32); the wheel body (311) is rotatably connected to a wheel seat (313) via a rotating shaft (312), and the sootblowing assembly (9) is connected to the wheel seat (313); a rotating driving component (314) is provided on the wheel seat (313), and an output shaft of the rotating driving component (314) is dynamically connected to one end of the rotating shaft (312).

4. The pre-dust removal device for a selective catalytic reduction denitration system according to claim 3, characterized in that: The sootblowing assembly (9) comprises a connecting rod (91), both ends of which are respectively connected to corresponding wheel seats (313); and a plurality of sootblowers (92) arranged at intervals are connected to the connecting rod (91).

5. The pre-dust removal device for a selective catalytic reduction denitration system according to claim 1, characterized in that: A reducing agent nozzle (8) is sealed and penetrated through the vertical section of the flue (5); the reducing agent nozzle (8) is connected to a plurality of branch pipes (81) arranged at intervals; the filter element (1) is located above the branch pipes (81) and is connected to the branch pipes (81).

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