Flue gas sealing device suitable for ultra-large-section flue gas denitration reducing agent injection system

Abstract

The utility model discloses a flue gas sealing device suitable for a flue gas denitration reducing agent injection system with a super-large section, which is arranged in a flue for injecting a denitration reducing agent in a waste heat boiler of a gas turbine, and a group of denitration reducing agent injection system pipes are arranged in the flue. A plurality of sealing skid blocks are arranged at the position, penetrating through the flue top plate, of the denitration reducing agent injection system pipe, flue gas leakage is prevented, and the denitration reducing agent injection system pipe penetrates through the sealing skid blocks and then is fixed to the flue outer supporting structure. According to the utility model, the plurality of sealing skid blocks are arranged at the position where the denitration reducing agent injection system pipe penetrates through the flue top plate, and the sealing skid blocks carry out sealing and heat preservation on the position where the flue gas denitration reducing agent injection system pipe penetrates through the flue top plate, so that the flue gas leakage is prevented, and the heat energy loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas denitration treatment technical field, concretely relates to a flue gas sealing device suitable for super large section flue gas denitration reducing agent injection system. BACKGROUND

[0002] The gas turbine is a kind of high-temperature high-pressure gas generated by using fuel combustion as working medium, rotates turbine by airflow, and then converts the kinetic energy of gas into mechanical energy.The gas turbine has the advantages of high efficiency, large power, small volume, low investment, low running cost and long service life etc.It can be started quickly without external power supply, and has good mobility, and can drive peak load in power grid and serve as emergency backup, which can better guarantee the safe operation of power grid.Moreover, the gas turbine does not emit SO2, dust particles and other pollutants during operation, is widely used in energy power generation industry, and belongs to clean energy.

[0003] However, due to the existence of high-temperature combustion scene, NOx emission is inevitable, and the conventional low-nitrogen burner technology is used to control NOx emission to 50mg / m 3 With the continuous tightening of environmental emission standards, the emission problem of NOx in flue gas of gas turbine has gradually attracted attention, and the demand for denitration of gas turbine is increasing.The denitration of gas turbine is often in limited installation space, and the denitration reducing agent injection system is distributed on the super large section of waste heat boiler, in order to ensure the uniformity of reducing agent injection, the reducing agent injection system is generally composed of many injection pipes, the flue gas section is large, and there are many leakage points, so the sealing between flue gas section and reducing agent injection pipe also becomes a technical difficulty of the process.

[0004] Therefore, the utility model provides a sealing device suitable for super large section flue gas denitration reducing agent injection system, which achieves the effects of sealing flue gas and heat insulation. UTILITY MODEL CONTENTS

[0005] In view of the problems in the prior art, the utility model provides a flue gas sealing device suitable for super large section flue gas denitration reducing agent injection system, which adopts pry block type assembly structure, can adjust the number of pry blocks according to the specification of flue gas section, and is flexible to install.

[0006] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0007] A flue gas sealing device suitable for a flue gas denitration reducing agent injection system is installed in a flue of a gas turbine waste heat boiler injecting a denitration reducing agent, a group of denitration reducing agent injection system pipes are arranged in the flue, a plurality of sealing prizing blocks are arranged at the position where the denitration reducing agent injection system pipes pass through the flue top plate, so as to prevent flue gas leakage, and the denitration reducing agent injection system pipes are fixed to an outer support structure of the flue after passing through the sealing prizing blocks.

[0008] Further, the sealing prizing block comprises a primary sealing plate and a secondary sealing plate, the primary sealing plate is fixed to an outer heat preservation surface in the flue, high-temperature-resistant sealing and heat preservation filler is filled between the primary sealing plate and the secondary sealing plate, and the secondary sealing plate is fixed to the flue top plate through a secondary sealing plate support structure.

[0009] Further, the primary sealing plate is a multi-steel-plate laminated structure, and adjacent two steel plates are laminated and welded.

[0010] Further, a group of left half holes are uniformly arranged at the right end of the first steel plate along the width direction of the first steel plate, a right half hole and a left half hole are arranged at the left end and the right end of each middle steel plate respectively, and a right half hole matched with the left half hole is arranged at the left end of the last steel plate.

[0011] Further, the secondary sealing plate comprises a secondary sealing plate body, a group of circular holes matched with the denitration reducing agent injection system pipes are arranged on the secondary sealing plate body, the secondary sealing plate is connected to the secondary sealing plate support structure, and the secondary sealing plate support structure is fixed to the flue top plate.

[0012] Further, the denitration reducing agent injection system pipes are fixed to the outer support structure of the flue after passing through the primary sealing plate, the flue top plate and the circular holes of the secondary sealing plate.

[0013] Further, the number of the sealing prizing blocks is adjusted according to the flue gas cross section specification.

[0014] Compared with the prior art, the utility model has the beneficial effects as follows:

[0015] 1) the utility model discloses a plurality of sealing prizing blocks are arranged at the position where the denitration reducing agent injection system pipes pass through the flue top plate, the sealing prizing blocks seal and preserve heat at the position where the flue gas denitration reducing agent injection system pipes pass through the flue top plate, flue gas leakage is prevented, and heat energy loss is reduced.

[0016] 2) the primary sealing plate of the utility model is laminated and welded by a plurality of steel plates, flue gas scouring can be avoided, flue gas leakage points are reduced, sealing performance is improved, the multi-steel-plate laminated structure is assembled in blocks, field installation is facilitated, a semicircular hole type is arranged on each steel plate, and the installation of the denitration reducing agent injection system pipes is facilitated.

[0017] 3) The utility model discloses a sealing pry block, which adjusts the number of pry blocks according to the flue gas cross section specification and is flexibly installed. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a sealing device pry block schematic view of the utility model;

[0019] Figure 2 It is a secondary sealing plate schematic view of the utility model;

[0020] Figure 3 It is a primary sealing plate schematic view of the utility model;

[0021] Figure 4 It is a semicircular hole schematic view on the adjacent primary sealing plate of the utility model;

[0022] Figure 5 It is a sealing device assembly schematic view of the utility model.

[0023] In the drawing: 1, primary sealing plate; 101, left half hole; 102, right half hole; 2, high-temperature-resistant sealing heat preservation filler; 3, secondary sealing plate; 301, round hole; 4, secondary sealing plate support structure; 5, flue outer support structure; 6, denitration reducing agent injection system pipe; 7, flue inner heat preservation outer surface; 8, flue top plate. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings, but the range protected by the utility model is not limited to the range.

[0025] Please refer to Figure 5 A flue gas sealing device suitable for super-large cross section flue gas denitration reducing agent injection system is installed in the flue of the flue gas turbine waste heat boiler injection denitration reducing agent, a group of denitration reducing agent injection system pipes 6 are arranged in the flue, the denitration reducing agent injection system pipes 6 pass through the flue top plate 8 and are provided with a plurality of sealing pry blocks, the sealing pry blocks seal and heat preserve the flue top plate 8 where the denitration reducing agent injection system pipes 6 pass through, prevent flue gas leakage and reduce heat energy loss. The number of sealing pry blocks is adjusted according to the flue gas cross section specification. The denitration reducing agent injection system pipes 6 are fixed to the flue outer support structure 5 after passing through the sealing pry blocks.

[0026] The flue gas sealing device adopts pry block type assembly structure, the number and combination mode of pry blocks can be flexibly adjusted according to the flue gas cross section specification, and the pry blocks can be connected by welding or bolts. Each sealing device pry block is composed of a primary sealing plate 1, a high-temperature-resistant sealing heat preservation filler 2, a secondary sealing plate 3 and a secondary sealing plate support structure 4.

[0027] Please refer to Figure 1, the sealing pry block includes a first sealing plate 1 and a second sealing plate 3, the first sealing plate 1 is fixed to the heat preservation outer surface 7 in the flue, the first sealing plate 1 and the second sealing plate 3 are filled with high-temperature-resistant sealing heat preservation filler 2, further preventing smoke leakage and reducing heat loss. The second sealing plate 3 is fixed to the flue top plate 8 through the second sealing plate support structure 4.

[0028] Please refer to Figure 3 , the first sealing plate 1 is a multi-steel plate laminated structure, and adjacent two steel plates are laminated and welded. In this embodiment, the first sealing plate 1 is laminated and welded by multiple steel plates, which can avoid smoke scouring, reduce smoke leakage points, increase sealing performance, and facilitate on-site installation by adopting block assembly construction of multi-steel plate laminated structure.

[0029] Please refer to Figure 4 , a group of left half holes 101 are evenly arranged on the right end of the first steel plate along the width direction, right half holes 102 and left half holes 101 are arranged on the left end and the right end of each steel plate in the middle, respectively, and the left end of the last steel plate is provided with a right half hole 102 matched with the left half hole in size. When the denitration reducing agent injection system pipe 6 passes through the first sealing plate 1, the pipe is first placed in the half hole, and then another steel plate is pushed in and welded.

[0030] Please refer to Figure 2 , the second sealing plate 3 includes a second sealing plate body, a group of circular holes 301 matched with the denitration reducing agent injection system pipe 6 in size are arranged on the second sealing plate body, the second sealing plate 3 is connected to the second sealing plate support structure 4, and the second sealing plate support structure 4 is fixed to the flue top plate 8.

[0031] The denitration reducing agent injection system pipe 6 is fixed to the flue outer support structure 5 after passing through the first sealing plate 1, the flue top plate 8 and the circular hole 301 of the second sealing plate 3.

Claims

1. A flue gas sealing device suitable for a flue gas denitration reductant injection system, installed in the flue of a gas turbine waste heat boiler injecting a denitration reductant, a set of denitration reductant injection system pipes (6) being arranged in the flue, characterized in that The denitration reducing agent injection system pipe (6) passes through the flue top plate (8) and is provided with a plurality of sealing props to prevent flue gas leakage. The denitration reducing agent injection system pipe (6) is fixed to the flue outer support structure (5) after passing through the sealing props.

2. The flue gas sealing device suitable for the flue gas denitration reducing agent injection system with super-large cross section according to claim 1, characterized in that The sealing props include a first sealing plate (1) and a second sealing plate (3). The first sealing plate (1) is fixed to the flue inner heat preservation outer surface (7). The first sealing plate (1) and the second sealing plate (3) are filled with high-temperature-resistant sealing heat preservation filler (2). The second sealing plate (3) is fixed to the flue top plate (8) through the second sealing plate support structure (4).

3. The flue gas sealing device suitable for the flue gas denitration reducing agent injection system with super-large cross section according to claim 2, characterized in that The first sealing plate (1) is a multi-steel plate laminated structure. Adjacent two steel plates are laminated and welded.

4. The flue gas sealing device suitable for the flue gas denitration reducing agent injection system with super-large cross section according to claim 3, characterized in that The right end of the first steel plate is uniformly provided with a group of left half holes (101) along the width direction. The left end and the right end of each steel plate in the middle are respectively provided with right half holes (102) and left half holes (101). The left end of the last steel plate is provided with a right half hole (102) matched with the left half hole in size.

5. A flue gas sealing device suitable for use in a flue gas denitration reducing agent injection system for a super large cross section according to claim 4, characterized in that The second sealing plate (3) includes a second sealing plate body. A group of circular holes (301) matched with the denitration reducing agent injection system pipe (6) in size are formed in the second sealing plate body. The second sealing plate (3) is connected to the second sealing plate support structure (4). The second sealing plate support structure (4) is fixed to the flue top plate (8).

6. A flue gas sealing device suitable for use in a flue gas denitration reducing agent injection system for a super large cross section according to claim 4, characterized in that The denitration reducing agent injection system pipe (6) is fixed to the flue outer support structure (5) after passing through the first sealing plate (1), the flue top plate (8) and the circular holes (301) of the second sealing plate (3).

7. The flue gas sealing device suitable for the flue gas denitration reducing agent injection system with super-large cross section according to claim 1, characterized in that The number of the sealing props is adjusted according to the flue gas cross section specification.

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