SCR (Selective Catalytic Reduction) pulse type steam soot blower

Abstract

The utility model discloses an SCR pulse type steam soot blower, and belongs to the technical field of flue gas denitration. Comprising an SCR reactor, pulse type steam soot blowing components are arranged on the two sides of the SCR reactor, each pulse type steam soot blowing component comprises a steam main pipe, side pipes, a connecting pipe, an auxiliary blowing pipe and an electromagnetic valve, the steam main pipe is arranged on one side of the SCR reactor, the side pipes are transversely and evenly distributed on the side wall of the steam main pipe, and the connecting pipes are transversely arranged at the upper end of the steam main pipe; the auxiliary blowpipe is communicated with the upper part of the SCR reactor; and the electromagnetic valve is arranged on the side pipe and the auxiliary blowpipe. According to the utility model, the pulse-type steam soot blowing component is adopted to carry out multi-section soot cleaning on a plurality of grids of the SCR reactor from top to bottom, so that the furnace ash of the grids in the SCR reactor can be effectively cleaned. In addition, furnace ash cleaned by the pulse type steam ash blowing component is blown to the bottom of the SCR reactor through the auxiliary blowing pipe and is discharged through the air leakage pipe, and the furnace ash can be effectively prevented from being scattered on the grating again.

Description

Technical Field

[0001] The utility model relates to an SCR pulse steam soot blowing device, belonging to the technical field of flue gas denitration. Background Art

[0002] SCR denitrification technology is highly valued and widely used in the power industry for its high removal efficiency and adaptability to current environmental protection requirements. In developed countries with strict environmental protection requirements such as Germany, Japan, the United States, Canada, the Netherlands, Austria, Sweden, Denmark and other countries, SCR denitrification technology has become one of the most widely used and mature technologies. According to the experience of developed countries, SCR denitrification technology will inevitably become the main denitrification technology for coal-fired boilers in my country's thermal power plants and will be used more and more widely. The SCR system generally consists of an ammonia storage system, an ammonia and air mixing system, an ammonia injection system, a reactor system, an economizer bypass, an SCR bypass, a detection and control system, etc. Liquid ammonia is sent from the liquid ammonia tank truck to the liquid ammonia storage tank by the unloading compressor, and then evaporated into ammonia gas in the evaporator tank and then enters the boiler area through the ammonia buffer tank and the delivery pipeline. After being evenly mixed with air, it enters the SCR reactor through the distribution pilot valve for internal reaction. The SCR reactor is set in front of the air preheater. Ammonia is evenly distributed and mixed with flue gas above the SCR reactor through a special spray device. After mixing, the flue gas undergoes a reduction reaction through the catalyst layer in the reactor. During this working process, ash accumulation will occur in the SCR denitrification device, thus affecting the denitrification reaction efficiency.

[0003] At present, a retractable rake-type steam soot blower is commonly used in the market to remove the dust accumulated on the catalyst surface. The soot blowing strength is relatively large and the loose dust removal effect is good. However, the rake-type steam soot blower has a complex structure and needs to be introduced into the SCR reactor when cleaning the SCR reactor. The operation time is long, which affects the normal operation of the SCR reactor.

[0004] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an SCR pulse steam soot blowing device which can quickly clean soot and does not affect the normal operation of the SCR reactor in view of the above shortcomings.

[0006] An optimization scheme, an SCR pulse steam soot blowing device, includes an SCR reactor, pulse steam soot blowing components are arranged on both sides of the SCR reactor, the pulse steam soot blowing components include a steam main pipe, a side pipe, a connecting pipe, an auxiliary blow pipe and a solenoid valve, the steam main pipe is arranged on one side of the SCR reactor, a plurality of side pipes are arranged, the side pipes are uniformly distributed laterally on the side wall of the steam main pipe, the side pipes are connected to the side wall of the SCR reactor, the connecting pipe is laterally arranged at the upper end of the steam main pipe, the auxiliary blow pipe is connected to the upper part of the SCR reactor, the connecting pipes of the pulse steam soot blowing components on both sides of the SCR reactor are connected to the auxiliary blow pipe, a plurality of solenoid valves are arranged, and the solenoid valves are arranged on the side pipes and the auxiliary blow pipe.

[0007] Furthermore, the connecting pipes of the pulse steam soot blowing components on both sides of the SCR reactor are connected and arranged on the upper part of the auxiliary blowing pipe.

[0008] Furthermore, the connecting pipes of the pulse steam soot blowing components on both sides of the SCR reactor are connected to the auxiliary blowing pipes.

[0009] Furthermore, the solenoid valve on the auxiliary blowpipe is arranged at the lower part of the connecting pipe.

[0010] Furthermore, a gas release pipe is provided at the lower part of the SCR reactor, and a solenoid valve is provided on the gas release pipe.

[0011] Furthermore, the inner cavity of the SCR reactor is symmetrically provided with a plurality of evenly distributed grids, and the grids are evenly arranged on both sides of the inner cavity of the SCR reactor.

[0012] Furthermore, the number of the side pipes is arranged in one-to-one correspondence with the grilles.

[0013] Furthermore, one end of the side pipe communicating with the SCR reactor is placed on the upper part of the grid.

[0014] Furthermore, the side tube is placed in the inner cavity of the SCR reactor and is provided with an air guide plate at one end thereof, an air outlet is provided between the air guide plate and the side tube, and the air outlet is arranged close to the grille.

[0015] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0016] The utility model adopts a pulse steam soot blowing component to perform multi-stage soot cleaning on multiple grids of the SCR reactor from top to bottom, which can effectively clean the ash on the grids in the SCR reactor. In addition, the ash cleaned by the pulse steam soot blowing component is blown to the bottom of the SCR reactor through an auxiliary blowpipe and discharged through an air vent pipe, which can effectively prevent the ash from being scattered on the grid again. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the SCR pulse steam sootblowing device of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of a mixing barrel of the SCR pulse steam sootblowing device of the utility model;

[0019] In the figure, 1-SCR reactor, 2-pulse steam soot blowing component, 3-steam main pipe, 4-side pipe, 5-connecting pipe, 6-auxiliary blow pipe, 7-solenoid valve, 8-vent pipe, 9-grid, 10-air guide plate, 11-air outlet. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "top surface", "bottom surface" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] Examples, such as Figure 1 and 2 As shown, the utility model provides an SCR pulse steam soot blowing device, including an SCR reactor 1, pulse steam soot blowing components 2 are arranged on both sides of the SCR reactor 1, the pulse steam soot blowing components 2 include a steam main pipe 3, a side pipe 4, a connecting pipe 5, an auxiliary blowpipe 6 and a solenoid valve 7, the steam main pipe 3 is arranged on one side of the SCR reactor 1, a plurality of side pipes 4 are arranged, the side pipes 4 are uniformly distributed laterally on the side wall of the steam main pipe 3, the side pipe 4 is connected to the side wall of the SCR reactor 1, the connecting pipe 5 is arranged laterally at the upper end of the steam main pipe 3, the auxiliary blowpipe 6 is connected to the upper part of the SCR reactor 1, the connecting pipes 5 of the pulse steam soot blowing components 2 on both sides of the SCR reactor 1 are connected to the auxiliary blowpipe 6, a plurality of solenoid valves 7 are arranged, and the solenoid valve 7 is arranged on the side pipe 4 and the auxiliary blowpipe 6.

[0024] The connecting pipes 5 of the pulse steam soot blowing components 2 on both sides of the SCR reactor 1 are connected and arranged on the upper part of the auxiliary blowing pipe 6 .

[0025] The connecting pipes 5 of the pulse steam soot blowing components 2 on both sides of the SCR reactor 1 are connected to the auxiliary blowing pipes 6 .

[0026] The solenoid valve 7 on the auxiliary blowpipe 6 is arranged at the lower part of the connecting pipe 5 .

[0027] A gas release pipe 8 is provided at the lower part of the SCR reactor 1 , and a solenoid valve 7 is provided at the gas release pipe 8 .

[0028] The inner cavity of the SCR reactor 1 is symmetrically provided with a plurality of evenly distributed grids 9 , and the grids 9 are evenly arranged on both sides of the inner cavity of the SCR reactor 1 .

[0029] The number of the side pipes 4 and the grilles 9 are arranged in one-to-one correspondence.

[0030] One end of the side pipe 4 communicating with the SCR reactor 1 is placed on the upper part of the grid 9 .

[0031] The side pipe 4 is placed in the inner cavity of the SCR reactor 1 , and one end thereof is provided with an air guide plate 10 . An air outlet 11 is provided between the air guide plate 10 and the side pipe 4 . The air outlet 11 is provided close to the grille 9 .

[0032] The working principle of this utility model:

[0033] The steam main pipe 3 is fed with high-pressure steam gas. When the SCR reactor 1 is cleaned, the side pipe 4 on the upper part of the SCR reactor 1 is intermittently opened from top to bottom through the solenoid valve 7. After the steam gas cleans the grille 9 on the upper part of the SCR reactor 1, the side pipe 4 on the lower part can be opened to clean the grille 9 of the next SCR reactor 1.

[0034] When steam is introduced into the side pipe 4 to clean the grid 9, the solenoid valve 7 of the auxiliary blowpipe 6 and the solenoid valve 7 of the vent pipe 8 are opened at the same time, and the steam blows the ash to the middle of the SCR reactor 1. The auxiliary blowpipe 6 blows the ash blown to the middle of the SCR reactor 1 to the bottom of the SCR reactor 1 and discharges it through the vent pipe 8. After the ash is discharged, the solenoid valves 7 of the auxiliary blowpipe 6 and the vent pipe 8 are closed, waiting for the next grid 9 to be processed.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0036] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. SCR pulse steam sootblowing device, characterized by: The invention comprises an SCR reactor (1), wherein pulse steam soot blowing components (2) are arranged on both sides of the SCR reactor (1), wherein the pulse steam soot blowing components (2) comprise a steam main pipe (3), a side pipe (4), a connecting pipe (5), an auxiliary blowing pipe (6) and a solenoid valve (7), wherein the steam main pipe (3) is arranged on one side of the SCR reactor (1), a plurality of side pipes (4) are arranged, the side pipes (4) are uniformly distributed laterally on the side wall of the steam main pipe (3), the side pipes (4) are connected to the side wall of the SCR reactor (1), the connecting pipe (5) is arranged laterally on the upper end of the steam main pipe (3), the auxiliary blowing pipe (6) is connected to the upper part of the SCR reactor (1), the connecting pipes (5) of the pulse steam soot blowing components (2) on both sides of the SCR reactor (1) are connected to the auxiliary blowing pipe (6), and a plurality of solenoid valves (7) are arranged, and the solenoid valves (7) are arranged on the side pipe (4) and the auxiliary blowing pipe (6).

2. The SCR pulse steam sootblowing device according to claim 1 is characterized in that: The connecting pipes (5) of the pulse steam soot blowing components (2) on both sides of the SCR reactor (1) are connected and arranged on the upper part of the auxiliary blowing pipe (6).

3. The SCR pulse steam sootblowing device according to claim 1 is characterized in that: The connecting pipes (5) of the pulse steam soot blowing components (2) on both sides of the SCR reactor (1) are connected to the auxiliary blowing pipes (6).

4. The SCR pulse steam sootblowing device according to claim 1, characterized in that: The solenoid valve (7) on the auxiliary blowpipe (6) is arranged at the lower part of the connecting pipe (5).

5. The SCR pulse steam sootblowing device according to claim 1, characterized in that: A gas discharge pipe (8) is provided at the lower part of the SCR reactor (1), and the gas discharge pipe (8) is provided with a solenoid valve (7).

6. The SCR pulse steam sootblowing device according to claim 1, characterized in that: The inner cavity of the SCR reactor (1) is symmetrically provided with a plurality of evenly distributed grids (9), and the grids (9) are evenly arranged on both sides of the inner cavity of the SCR reactor (1) from top to bottom.

7. The SCR pulse steam sootblowing device according to claim 6, characterized in that: The number of the side pipes (4) is arranged in one-to-one correspondence with the number of the grilles (9).

8. The SCR pulse steam sootblowing device according to claim 7, characterized in that: One end of the side pipe (4) connected to the SCR reactor (1) is placed on the upper part of the grid (9).

9. The SCR pulse steam sootblowing device according to claim 8, characterized in that: The side pipe (4) is placed in the inner cavity of the SCR reactor (1) and is provided with an air guide plate (10) at one end thereof. An air outlet (11) is provided between the air guide plate (10) and the side pipe (4), and the air outlet (11) is arranged close to the grille (9).

Images