Boiler flue gas denitration / desulfurization lance

Abstract

The invention aims to provide a boiler flue gas denitration / desulfurization spray gun, comprising a tubular gun barrel, a nozzle is arranged at the front end of the gun barrel, an air inlet pipe and a liquid inlet pipe are arranged at the rear section of the gun barrel, the air inlet pipe is located at or close to the rear end of the gun barrel, a pipe seat for restraining and fixing the barrel body of the gun barrel is arranged on the furnace body of the boiler, the gun barrel is in translational motion relative to the furnace body of the boiler, or a combined adjustment structure scheme is adopted, in which the gun barrel is in translational motion and rotation relative to the furnace body of the boiler. Not only is the installation convenient, but also the position reached by the nozzle is adjusted, so that the position of the water agent atomization area in the flue or the hopper is selected within a wider range, and the position of the nozzle is adjusted to achieve the best treatment effect.

Description

Technical Field

[0001] This invention relates to boiler auxiliary environmental protection equipment, specifically a spray gun that can be attached to the boiler flue gas passage for spraying desulfurization or denitrification water agents. Background Technology

[0002] With increased environmental awareness and improved environmental regulations, flue gas emissions from boiler equipment are subject to strict restrictions, meaning that boiler flue gas emissions must meet the requirements of environmental regulations.

[0003] Boilers primarily use coal as their calorific value feedstock. However, with the diversification of energy sources, there is a clear trend and strong demand among boiler users with the means to adopt natural gas. Nevertheless, the complete replacement of coal with clean energy will take time. For flue gas treatment of coal-fired boilers or those using similar feedstocks, achieving emission standards is becoming increasingly challenging. Practice and experiments have demonstrated the significant effectiveness of using spray guns to inject urea-containing aqueous solutions into the flue gas path for desulfurization and denitrification of high-temperature flue gas. There are several options for the installation location of the spray guns, including installation at the bottom of the boiler. However, this requires manually removing the ash discharge gate valve at the bottom of the boiler. Since the boiler flue gas flow direction is bottom inlet and top outlet, and the bottom temperature is close to 1000 degrees Celsius, the removal of the gate valve causes molten ash to fall from the boiler, posing a significant safety hazard to operators and causing severe pollution to the workshop environment.

[0004] Furthermore, during the use of the spray gun, the supply of the solution needs to be increased according to changes in the NOx content of the exhaust gas. The spray gun needs to be disassembled, and the water-to-air ratio needs to be adjusted promptly to achieve a good atomization effect. Both the installation of the spray gun and the adjustment of the atomization effect pose significant safety risks and generate serious pollution to the on-site working environment.

[0005] In existing technologies, the location and spray direction of the spray guns used for flue gas desulfurization and denitrification are fixed. An improvement solution is proposed, entitled "A Desulfurization and Denitrification Spray Gun Angle Adjustment System" (Publication (Announcement) No.: CN216769461U). This invention relates to the field of boiler flue gas treatment. The boiler is provided with an installation opening that fits with the atomizing spray gun; the atomizing spray gun is externally connected to an angle adjustment device, which drives the atomizing spray gun to move around the installation opening to adjust the nozzle angle of the atomizing spray gun. The above-mentioned technical solutions have the following drawbacks. First, the adjustment of the spray area depends on the adjustment of the spray gun angle. If the nozzle is considered a point, the position of that point remains fixed. If the flow velocity of the sprayed gas-liquid mixture is constant, it is difficult to achieve a larger radius spray area simply by adjusting the spray gun angle. Second, achieving spray gun nozzle angle adjustment requires meeting two conditions: first, the nozzle end must be hinged to the furnace or flue wall, allowing for rotation; second, a telescopic rod must be installed to provide power to drive the spray gun to rotate. The problem is that there is no foundation nearby on the furnace or flue wall to support the telescopic rod, or the choice of supporting foundation is limited. Therefore, the solutions provided in the above literature are difficult to implement in actual production, and sometimes even impossible. Summary of the Invention

[0006] The purpose of this invention is to provide a boiler flue gas denitrification / desulfurization spray gun that is not only easy to install but also facilitates adjustment of the nozzle's reach.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a boiler flue gas denitrification / desulfurization spray gun, comprising a tubular gun rod, a nozzle at the front end of the gun rod, an air inlet pipe and a liquid inlet pipe at the rear end of the gun rod, the air inlet pipe being located at or near the rear end of the gun rod, characterized in that: a tube seat constraining and fixing the gun rod body is arranged on the boiler furnace body, the gun rod being translational relative to the boiler furnace body, or adopting a scheme of adjustment structure combining translational and rotational movement of the gun rod relative to the boiler furnace body.

[0008] In the above technical solution, the gun barrel body can be any existing technology. The key point of this invention is that it provides a tube seat to constrain and fix the barrel body, which can realize the sliding displacement of the gun barrel on the tube seat and then apply locking. This can realize the most basic translational displacement adjustment. The position that the nozzle at the front end of the gun barrel can reach in the flue or ash hopper is adjustable, so that it can reach a wider range of positions in the water atomization area in the flue or ash hopper, which is beneficial to adjust the nozzle position to achieve the best treatment effect.

[0009] Option 2 of the above schemes, namely the gun rod, has a combined translational and rotational adjustment structure relative to the boiler body. The gun rod has both translational and rotational movement modes and is constrained and fixed when the spray gun is adjusted to a suitable position and posture, which can ensure that the position of the atomization zone of the sprayed water agent has a wide range of choices. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a structural diagram of a specific embodiment of the present invention; Figure 3 , 4 Figures 5 and 6 are for each component. Figure 6 It uses a state structure diagram. Detailed Implementation

[0011] See Figure 1 A boiler flue gas denitrification / desulfurization spray gun includes a tubular gun rod 10. A nozzle 14 is provided at the front end of the gun rod 10, and an air inlet pipe 11, a liquid inlet pipe 12, and a spare pipe 13 are provided at the rear end of the gun rod 10. The air inlet pipe 11 is located at or near the rear end of the gun rod 10. A pipe seat 20 for constraining and fixing the rod body of the gun rod 10 is arranged on the boiler body. The gun rod 10 has a translational adjustment structure relative to the boiler body.

[0012] The above scheme is based on Scheme 1. The key difference between Scheme 2 and Scheme 1 is that the gun rod 10 has a combined translational and rotational adjustment structure relative to the boiler body. In Scheme 2, the gun rod 10 includes both translational and rotational movement adjustment methods, thus ensuring more flexible selection of the position and range of the sprayed water atomization zone.

[0013] The significant technological advancements of Schemes 1 and 2 are reflected in the fact that, without considering the pressure of the pressurized gas and the flow rate of the water agent, since the position of the nozzle 14 can be translated or combined with rotational displacement, the nozzle 14 can more easily reach the corresponding position inside the ash hopper or flue, thereby expanding the reachable area of ​​the water agent atomization zone.

[0014] The following provides a detailed explanation of Scheme 1, and the relevant solutions also explain the specific implementation of Scheme 2. Therefore, the preferred solution of Scheme 2 will not be described in the following explanation.

[0015] The tube seat 20 is a movable sleeve fitted onto the gun rod 10. The tube seat 20 has a radial locking unit that locks and restricts the axial displacement of the gun rod 10 within its cavity. Since the tube seat 20 is loosely fitted onto the gun rod 10, the gun rod 10 can move along the core direction within the tube seat 20. Once it reaches an appropriate position, it is locked by the locking unit. At this point, the position of the gun rod 10 retracted or extended within the flue or ash hopper is determined, and the position of the nozzle 14 is accordingly determined. Combined with the pressure of the pressurized gas and the flow rate of the water agent, the position and range of the atomization zone of the sprayed water agent are determined. The selection of the locking unit is straightforward; for example, a threaded hole 221 can be opened in the tube wall of the tube seat 20 and fitted with a locking screw 222.

[0016] Combination Figure 1 The tube seat 20 is slidably arranged on the slide block 30. The slide block 30 includes two parallel and spaced slide rails 31. The tube wall of the tube seat 20 has trunnion-shaped protruding slide pins 21. The two slide pins 21 are slidably engaged with the two slide rails 31 that constitute the slide block 30, and the two are locked together.

[0017] In the above scheme, the sliding engagement between the sliding column 21 and the slide rail 31 limits the linear motion of the tube seat 20, which is a basic form of translational operation. The direction of the linear motion is the direction of the slide rail 31. After the tube seat 20 and the gun rod 10 are locked by the locking unit, the tube seat 20 and the gun rod 10 can be regarded as an integral structure. Therefore, the gun rod 10 moves with the tube seat 20 relative to the direction defined by the slide rail 31. Without considering the rotation of the sliding column 21 in the slide rail 31, the gun rod 10 moves in the direction defined by the slide rail 31 while keeping the rod core parallel.

[0018] Combination Figure 1 , 2 The outer wall section of one end of the tube seat 20 has a cross-section of a square tube section 22 with a two-sided, four-sided or hexagonal profile. The tube seat 20 has a sliding column 21 concentrically arranged on opposite sides around the circumference. The outer section of the sliding column 21 is a threaded section 211. The slide rail 31 has a strip hole 311 forming a limiting guide part. The square tube section of the tube seat 20 is placed between the two slide rails 31. The sliding column 21 is inserted into the strip hole 311 of the slide rail 31 of the two slide seats 30 and the threaded section protruding to the outside of the strip hole 311 is connected to a nut 40. The square tube segment 22 serves two purposes: firstly, it facilitates the opening of threaded holes for locking screws on the flat side of the square tube segment 22; secondly, the corner of the junction of adjacent planes is provided with a sliding post 21, so that when the corner part contacts the inner side of the slide rail 31 during assembly, it will not cause a change in the distance between the two slide rails 31, thus avoiding deformation of the slide rails 31 when the nut 40 is tightened on the sliding post 21. At the same time, the corner of the square tube segment 22 with the sliding post 21 has the function of moderately pressing the slide rail 31, ensuring a stable and reliable fixation between the square tube segment 22 and the slide rail 31.

[0019] To facilitate the installation of this invention in the boiler ash hopper area, this invention provides a base plate 50, combined with... Figure 1 The base plate 50 is arranged on the bottom ash hopper wall A of the boiler body. A slide seat 30 consisting of two parallel and spaced slide rails 31 is mounted on the base plate 50. A trunnion-shaped protruding slide column 21 is provided on the tube seat 20. The two slide columns 21 are slidably engaged with the two slide rails 31 that constitute the slide seat 30 and the two are locked together. The base plate 50 has an empty area 51 for the gun rod 10 to pass through.

[0020] The base plate 50 has an empty area 51 for the gun rod 10 to pass through, which is a strip-shaped space between two slide rails 31. Sliding or foldable baffles 52 are provided above and below the gun rod 10. The empty area 51 ensures that the gun rod 10 can pass through and is arranged, while also reserving space for the gun rod 10 to move without interference as it moves with the tube seat 20. Under normal circumstances, baffles are not necessary because the ash hopper is under negative pressure during normal boiler operation, and no fire particles or dust will fall. The attached figure shows the case of foldable baffle 52. If the negative pressure environment is disrupted due to malfunction or other reasons, or if a heavy fire piece falls, the baffle 52 can play a certain role in environmental protection and safety.

[0021] The slide rail 31 is U-shaped. The U-shaped area between the first and second arms 31 and 31b forms a strip hole 311, and the two strip holes 311 are arranged in the same direction and with the same core. The first arm 31 is adjacent to and flush with the flue wall, and the second arm 31b is far away and flush with the flue wall. The free end of the second arm 31b has an externally mounted protruding rod 32, and the end of the protruding rod 32 has a connecting rod 33 extending toward the side where the flue wall is located. As shown in the figure, when the base plate 50 is provided, the slide rail 31 is directly welded to the base plate 50. The outline of the base plate 50 is similar to a concave shape. The first arm 31 is directly welded to the side plate edges of the empty area 51. The U-shaped rod formed by the first and second arms 31 and 31b is perpendicular to the base plate 50. The angled rod or L-shaped rod formed by the protruding rod 32 and the connecting rod 33 provides a T-shaped opening at one end of the slide block 30. This T-shaped opening matches the T-shaped shape formed by the trunnion-shaped protruding slide column 21 of the tube seat 20. Therefore, the tube seat 20 with the slide column 21 can be assembled from the T-shaped opening. During assembly, the base plate 50 with the slide block 30 can be first installed on the ash hopper wall A, then the tube seat 20 can be initially installed on the slide block 30, and then the gun rod 10 can be installed on the tube seat 20. The installation process is labor-saving and quick. During debugging, three degrees of freedom can be adjusted: first, the position of the tube seat 20 along the length of the slide rail 31 can be adjusted by rotating the tube seat 20 around the core of the slide column 21 within the slide rail 31, that is, adjusting the core direction of the tube seat 20, i.e., adjusting the angle between the core of the tube seat 20 and the reference plane, such as the horizontal plane; third, the axial displacement of the gun rod 10 in the core direction of the tube seat 20 can adjust the distance between the nozzle 14 and the tube seat 20. The above three adjustment schemes can adjust the position and spray direction of the nozzle 14, so that the spray area and position are adjusted to a suitable spatial area to obtain the best denitrification or desulfurization effect.

Claims

1. A boiler flue gas denitrification / desulfurization spray gun, comprising a tubular gun rod (10), a nozzle (14) disposed at the front end of the gun rod (10), an air inlet pipe (11) and a liquid inlet pipe (12) disposed at the rear end of the gun rod (10), the air inlet pipe (11) being located at or near the rear end of the gun rod (10), characterized in that: The tube seat (20) of the rod body of the gun rod (10) is arranged on the furnace body of the boiler. The gun rod (10) has a combined translational and rotational adjustment structure relative to the furnace body of the boiler. The tube seat (20) is slidably arranged on the slide (30). The slide (30) includes two parallel and spaced slide rails (31). The tube wall of the tube seat (20) has trunnion-shaped protruding slide columns (21). The slide columns (21) are cylindrical. The two slide columns (21) and the two slide rails (31) constituting the slide (30) simultaneously form a sliding and rotating fit, and the two form a locking fit. The outer section of the slide column (21) is a threaded section. The slide rail (31) has a strip hole (311) forming a limiting guide. The slide column (21) is inserted into the strip hole (311) of the slide rail (31) of the two slide blocks (30) and the threaded section protruding to the outside of the strip hole (311) is connected to a nut (40). The outer wall section of one end of the tube seat (20) has a cross section of a square tube section (22) with a two-sided, four-sided or six-sided profile. Sliding columns (21) are coaxially arranged on opposite sides of the circumference of the tube seat (20). The square tube section of the tube seat (20) is placed between two sliding rails (31). The slide rail (31) is U-shaped. The U-shaped area between the first and second arms (31a, 31b) forms a strip hole (311), and the two strip holes (311) are arranged in the same direction and with the same core. The first arm (31a) is adjacent to and flush with the flue wall, and the second arm (31b) is far away and flush with the flue wall. The free end of the second arm (31b) has an externally mounted protruding rod (32), and the end of the protruding rod (32) has a connecting rod (33) extending toward the side where the flue wall is located.

2. The boiler flue gas denitrification / desulfurization spray gun according to claim 1, characterized in that: The tube seat (20) is a sleeve that is movably fitted onto the gun barrel (10). The tube seat (20) has a radial locking unit that locks and restricts the axial displacement of the gun barrel (10) within the cavity of the tube seat (20).

3. The boiler flue gas denitrification / desulfurization spray gun according to claim 1, characterized in that: The base plate (50) is arranged on the bottom ash hopper wall A of the boiler body, and the slide (30) is installed on the base plate (50). The base plate (50) has an empty area for the gun rod (10) to pass through.

4. The boiler flue gas denitrification / desulfurization spray gun according to claim 3, characterized in that: The base plate (50) has an empty area for the gun rod (10) to pass through, which is a strip-shaped space between two slide rails (31). Sliding or folding baffles (52) are provided above and below the gun rod (10).

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