Ammonia injection adjusting device for boiler

Abstract

The utility model relates to the technical field of boiler denitration, in particular to a boiler ammonia injection adjusting device which comprises at least one denitration device installed on the side wall of a boiler, the denitration device comprises a denitration spray gun, denitration swing arms and a denitration column, the end, extending into the boiler, of the denitration spray gun is provided with a plurality of denitration swing arms, and the denitration column is provided with a plurality of denitration holes. The denitration swing arm is rotatably mounted on the denitration spray gun through a rotating shaft, a gear is fixedly mounted on the rotating shaft, the denitration column is slidably mounted in the denitration spray gun, a rack is mounted on the denitration column, and the rack is meshed with the gear; the denitration swing arm comprises a base and a sliding arm installed on the base in a sliding mode, a cavity is formed in the sliding arm, a plurality of denitration spray heads are arranged on the sliding arm, and the denitration spray heads are communicated with the cavity through feeding channels. By changing the spraying range of a catalyst in the denitration swing arm, the catalyst is quickly mixed with boiler flue gas, and the denitration effect of the flue gas is improved.

Description

Technical Field

[0001] The utility model specifically relates to the technical field of boiler denitration, in particular to a boiler ammonia spraying regulating device. Background Art

[0002] In response to the restrictions on boiler nitrogen oxide emissions, commonly used denitrification methods in existing technologies include selective catalytic reduction (SCR) and non-selective catalytic reduction (SNCR).

[0003] The denitrification efficiency of SCR technology can reach more than 90%, but it needs to leave a certain space in the boiler design, and also needs catalysts and a suitable temperature range, and the operating cost is significantly increased. In the circulating fluidized bed boiler, due to the addition of limestone in the furnace, limestone powder and the generated CaSO4 are very likely to cause catalyst poisoning after reaching the tail, which limits the application in the circulating fluidized bed boiler. The SNCR method does not require a catalyst, has a lower operating cost and a short construction period. Urea and ammonia can usually be used as NOx reducing agents. The denitrification efficiency of SNCR technology is generally 50-60%.

[0004] The disadvantages of the denitrification spray gun in the prior art are: 1. There is a deviation in the denitrification efficiency. The concentration of ammonia water is high near the nozzle, and the denitrification efficiency is good. The concentration of ammonia water is low far from the nozzle, and the denitrification efficiency is poor. The overall mixing uniformity is poor, and the denitrification efficiency is relatively poor; 2. The denitrification spray gun is difficult to adjust after installation, and the spray range and amount of the catalyst cannot be adjusted according to the flue gas volume inside the boiler, resulting in unnecessary waste of catalyst. Utility Model Content

[0005] The utility model aims to provide a boiler ammonia injection regulating device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A boiler ammonia spraying regulating device comprises at least one denitration device installed on the side wall of the boiler, the denitration device comprises a denitration spray gun, a denitration swing arm and a denitration column, one end of the denitration spray gun extending into the boiler is provided with a plurality of denitration swing arms, the denitration swing arm is rotatably mounted on the denitration spray gun through a rotating shaft, a gear is fixedly mounted on the rotating shaft, the denitration column is slidably mounted inside the denitration spray gun, a rack is mounted on the denitration column, and the rack is meshed with the gear;

[0008] The denitrification swing arm includes a base and a sliding arm slidably mounted on the base, a cavity is opened inside the sliding arm, a plurality of denitrification nozzles are arranged on the sliding arm, and the denitrification nozzles are connected with the cavity through a feed channel; a feed column is also fixedly mounted on the base, and the feed column is a hollow structure, one end of the feed column extends into the interior of the cavity, and the other end of the feed column is connected with the feed pipe.

[0009] As a further solution of the utility model: a feed pipe is provided inside the denitrification spray gun, one end of the feed pipe is connected to a feed port opened at the tail of the denitrification spray gun, and the other end of the feed pipe is connected to the denitrification swing arm.

[0010] As a further solution of the utility model: the denitrification spray gun is installed on the side wall of the boiler through a mounting bracket, the mounting bracket is fixedly connected to the side wall of the boiler, and the denitrification spray gun is rotatably connected to the mounting bracket; a gear ring is also fixedly installed on the denitrification spray gun.

[0011] As a further solution of the utility model: a slide groove is provided on the base, a guide rod is fixedly installed inside the slide groove, a sliding sleeve is slidably installed on the guide rod, the sliding sleeve is fixedly connected to the sliding arm, and the sliding sleeve is connected to one side of the slide groove through a reset spring.

[0012] As a further solution of the utility model: one end of the denitrification column extending into the boiler is provided with a suction port and at least one discharge port, a mixing chamber is opened inside the denitrification column, a feed pump is also installed inside the denitrification column, the inlet of the feed pump is connected with the suction port, the outlet of the feed pump is connected with the discharge port through a discharge pipe, and a discharge pump is arranged on the discharge pipe; the feed pipe is also connected with a branch pipe, the branch pipe is a hose structure, and the branch pipe is connected with the mixing chamber.

[0013] As a further solution of the utility model: a filter is installed on the suction port.

[0014] As a further solution of the utility model: a telescopic part is also installed at the tail of the denitration spray gun, and the telescopic end of the telescopic part is connected to the denitration column through a connecting rod.

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

[0016] The utility model changes the spray range of the catalyst in the denitration swing arm so that the catalyst is quickly mixed with the boiler flue gas, thereby improving the denitration effect of the flue gas;

[0017] The utility model changes the number of connections between the feed channel and the cavity, so that the denitrification spray gun can adjust the amount of catalyst added according to the amount of flue gas inside the boiler, thereby avoiding excessive use of the catalyst;

[0018] The utility model uses a feed pump to draw the flue gas inside the boiler into the mixing chamber through the suction port, and uses a branch pipe to pass the catalyst into the mixing chamber, so that the flue gas and the catalyst are mixed and reacted in the mixing chamber, and finally the treated flue gas is discharged through the discharge port by a discharge pump, so that the flue gas and the catalyst are fully reacted, avoiding the problem that the flue gas cannot fully contact with the catalyst due to being far away from the denitrification spray gun, thereby further improving the denitrification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the boiler ammonia injection regulating device.

[0020] Figure 2 Schematic diagram of the structure of the denitrification device in the boiler ammonia injection regulating device Figure 1 .

[0021] Figure 3 Schematic diagram of the structure of the denitrification device in the boiler ammonia injection regulating device Figure 2 .

[0022] Figure 4 This is a side view of the boiler ammonia injection regulating device.

[0023] Figure 5 for Figure 4 Cross-sectional view along the AA direction.

[0024] Figure 6 This is a schematic diagram of the structure of the denitrification swing arm in the boiler ammonia injection regulating device.

[0025] In the figure: 10-boiler, 20-denitrification device, 21-denitrification spray gun, 211-feeding pipe, 22-denitrification swing arm, 221-base, 222-sliding arm, 223-cavity, 224-denitrification nozzle, 225-feeding column, 226-chute, 227-guide rod, 228-sleeve, 229-reset spring, 23-denitrification column, 231-mixing chamber, 232-discharging pipe, 233-rack, 234-feeding pump, 235-mounting head, 236-intake port, 237-discharging port, 24-gear ring, 25-feeding port, 26-telescopic member, 27-connecting rod, 28-gear, 30-mounting bracket. DETAILED DESCRIPTION

[0026] 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.

[0027] See also Figure 1-Figure 6In the embodiment of the utility model, a boiler ammonia spraying regulating device includes at least one denitration device 20 installed on the side wall of the boiler 10, the denitration device 20 partially extends into the interior of the boiler 10, the denitration device 20 includes a denitration spray gun 21, a denitration swing arm 22 and a denitration column 23, and the end of the denitration spray gun 21 extending into the interior of the boiler 10 is provided with a plurality of denitration swing arms 22, the denitration swing arms 22 are rotatably mounted on the denitration spray gun 21 through a rotating shaft (not shown in the figure), and a fixed mounting is installed on the rotating shaft. There is a gear 28, the denitration column 23 is slidably installed inside the denitration spray gun 21, and a rack 233 is installed on the denitration column 23, the rack 233 corresponds to the gear 28 one by one, and the rack 233 is meshed with the gear 28. When the denitration column 23 moves along the denitration spray gun 21, the gear 28 is driven to rotate by the rack 233, so that the rotating shaft drives the denitration swing arm 22 to rotate, and the injection range of the catalyst in the denitration swing arm 22 is changed, so that the catalyst is quickly mixed with the boiler flue gas, and the denitration effect of the flue gas is improved;

[0028] See also Figure 5 In the embodiment of the present application, a feed pipe 211 is provided inside the denitration spray gun 21, one end of the feed pipe 211 is connected to a feed port 25 provided at the tail of the denitration spray gun 21, and the other end of the feed pipe 211 is connected to the denitration swing arm 22. Specifically, in the present embodiment, the rotating shaft is a hollow shaft structure, the feed pipe 211 is connected to the rotating shaft, and the rotating shaft is connected to the denitration swing arm 22; it can be understood that the feed port 25 is used to provide a catalyst to the feed pipe 211, the catalyst flows into the denitration swing arm 22 along the feed pipe 211, and is sprayed into the boiler by the denitration swing arm 22 to achieve denitration treatment of the flue gas, and the catalyst is a 5% ammonia solution;

[0029] For further information, see Figure 6 In the embodiment of the present application, the denitration swing arm 22 includes a base 221, a sliding arm 222 slidably mounted on the base 221, a cavity 223 is provided inside the sliding arm 222, and a plurality of denitration nozzles 224 are arranged on the sliding arm 222. The denitration nozzles 224 are connected to the cavity 223 through a feed channel, and the denitration nozzles 224 are used to spray the catalyst after atomization treatment; a feed column 225 is also fixedly mounted on the base 221, and the feed column 225 is fixedly mounted on the base 221. The feed column 225 is a hollow structure. One end of the feed column 225 extends into the interior of the cavity 223. The other end of the feed column 225 is connected to the feed pipe 211. The catalyst enters the interior of the cavity 223 through the feed column 225. By adjusting the sliding distance of the sliding arm 222 on the base 221, the length of the rod section of the feed column 225 extending into the interior of the cavity 223 is changed, so that the distance between the feed column 225 and the cavity 223 is changed, thereby changing the number of conduction channels between the feed channel and the cavity 223, so as to Figure 6For example, in the initial state, the cavity 223 is only connected to the rightmost feed channel, and the rightmost denitrification nozzle 224 sprays the catalyst into the boiler 10. When the sliding arm 222 slides to the right, the distance between the feed column 225 and the cavity 223 increases, and the remaining feed channels are connected to the cavity 223 in turn, thereby increasing the number of denitrification nozzles 224 used, so that the denitrification spray gun 21 can adjust the amount of catalyst added according to the amount of flue gas inside the boiler 10 to avoid excessive use of the catalyst;

[0030] It should be noted that the denitrification spray gun 21 is installed on the side wall of the boiler 10 through a mounting bracket 30, the mounting bracket 30 is fixedly connected to the side wall of the boiler 10, the denitrification spray gun 21 is rotatably connected to the mounting bracket 30, and a seal (not shown in the figure) is provided at the connection between the denitrification spray gun 21 and the mounting bracket 30 to achieve sealing at the installation position of the denitrification spray gun 21; a gear ring 24 is also fixedly installed on the denitrification spray gun 21, and the gear ring 24 is used to cooperate with the rotating mechanism to drive the denitrification spray gun 21 to rotate. As a preferred embodiment, the rotating mechanism can be a speed regulating motor and a driving gear, the driving gear is meshed with the gear ring 24, and the output end of the speed regulating motor is fixedly connected to the driving gear. When the denitrification spray gun 21 is in a rotating state, the denitrification swing arm 22 is controlled to rotate outward by the denitrification column 23. Under the action of centrifugal force, the sliding arm 222 slides outward on the base 221. The sliding distance of the sliding arm 222 on the base 221 can be adjusted by changing the rotation speed of the speed regulating motor.

[0031] Please refer again Figure 6 In the embodiment of the present application, a slide groove 226 is provided on the base 221, a guide rod 227 is fixedly installed inside the slide groove 226, a sleeve 228 is slidably installed on the guide rod 227, the sleeve 228 is fixedly connected to the sliding arm 222, and the sleeve 228 is connected to one side of the slide groove 226 through a reset spring 229. After the denitrification spray gun 21 stops rotating, the sliding arm 222 is reset under the elastic force of the reset spring 229.

[0032] Please refer again Figure 5In the embodiment of the present application, the end of the denitration column 23 extending into the boiler 10 is provided with a mounting head 235, and a suction port 236 and at least one discharge port 237 are provided on the mounting head 235. A mixing chamber 231 is provided inside the denitration column 23, and a feed pump 234 is also installed inside the denitration column 23. The inlet of the feed pump 234 is connected to the suction port 236, and the outlet of the feed pump 234 is connected to the discharge port 237 through a discharge pipe 232, and a discharge pump is provided on the discharge pipe 232; the feed pipe 211 is also connected to a branch pipe, and the branch pipe is a hose structure, and the branch pipe is connected to the mixing chamber 231. In order to further improve the denitration efficiency, an atomizer connected to the branch pipe can be added inside the mixing chamber 231. The nozzle atomizes the catalyst flowing out of the branch pipe to make the contact between the flue gas and the catalyst more sufficient. It can be understood that in this embodiment, in the denitrification process, in addition to spraying the catalyst into the interior of the boiler 10 through the denitrification swing arm 22, this embodiment uses the feed pump 234 to draw the flue gas inside the boiler 10 into the mixing chamber 231 through the suction port 236, and uses the branch pipe to pass the catalyst into the mixing chamber 231, so that the flue gas and the catalyst are mixed and reacted in the mixing chamber 231, and finally the treated flue gas is discharged through the discharge port 237 by the discharge pump, so that the flue gas and the catalyst are fully reacted, thereby avoiding the problem that the flue gas cannot fully contact with the catalyst due to being far away from the denitrification spray gun 21, thereby further improving the denitrification effect.

[0033] It should be noted that, in the embodiment of the present application, a filter is installed on the suction port 236 for filtering and removing dust impurities in the flue gas, and the filter and the denitrification column 23 are detachable to facilitate cleaning of the denitrification column 23.

[0034] In addition, a telescopic part 26 is installed at the tail of the denitrification spray gun 21. The telescopic end of the telescopic part 26 is connected to the denitrification column 23 through a connecting rod 27, which is used to control the movement of the denitrification column 23 inside the denitrification spray gun 21. The telescopic part 26 is a telescopic rod or a cylinder.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A boiler ammonia injection regulating device, comprising at least one denitration device (20) installed on the side wall of a boiler (10), characterized in that: The denitration device (20) comprises a denitration spray gun (21), a denitration swing arm (22) and a denitration column (23); a plurality of denitration swing arms (22) are provided at one end of the denitration spray gun (21) extending into the interior of the boiler (10); the denitration swing arms (22) are rotatably mounted on the denitration spray gun (21) via a rotating shaft; a gear (28) is fixedly mounted on the rotating shaft; the denitration column (23) is slidably mounted inside the denitration spray gun (21); a rack (233) is mounted on the denitration column (23); the rack (233) is meshed with the gear (28); The denitration swing arm (22) comprises a base (221), a sliding arm (222) slidably mounted on the base (221), a cavity (223) being provided inside the sliding arm (222), a plurality of denitration nozzles (224) being provided on the sliding arm (222), and the denitration nozzles (224) being connected to the cavity (223) via a feed channel; a feed column (225) is also fixedly mounted on the base (221), the feed column (225) being a hollow structure, one end of the feed column (225) extending into the interior of the cavity (223), and the other end of the feed column (225) being connected to a feed pipe (211).

2. The boiler ammonia injection regulating device according to claim 1 is characterized in that: A feed pipe (211) is provided inside the denitration spray gun (21), one end of the feed pipe (211) is connected to a feed port (25) provided at the rear of the denitration spray gun (21), and the other end of the feed pipe (211) is connected to the denitration swing arm (22).

3. The boiler ammonia injection regulating device according to claim 1 is characterized in that: The denitration spray gun (21) is mounted on the side wall of the boiler (10) via a mounting bracket (30), the mounting bracket (30) is fixedly connected to the side wall of the boiler (10), and the denitration spray gun (21) is rotatably connected to the mounting bracket (30); a gear ring (24) is also fixedly mounted on the denitration spray gun (21).

4. The boiler ammonia injection regulating device according to claim 1, characterized in that: The base (221) is provided with a slide groove (226), a guide rod (227) is fixedly installed inside the slide groove (226), a slide sleeve (228) is slidably installed on the guide rod (227), the slide sleeve (228) is fixedly connected to the slide arm (222), and the slide sleeve (228) is connected to one side of the slide groove (226) via a return spring (229).

5. The boiler ammonia injection regulating device according to claim 1, characterized in that: An end of the denitration column (23) extending into the boiler (10) is provided with a suction port (236) and at least one discharge port (237); a mixing chamber (231) is provided inside the denitration column (23); a feed pump (234) is also installed inside the denitration column (23); an inlet of the feed pump (234) is connected to the suction port (236); an outlet of the feed pump (234) is connected to the discharge port (237) via a discharge pipe (232); a discharge pump is provided on the discharge pipe (232); the feed pipe (211) is also connected to a branch pipe, the branch pipe is a hose structure, and the branch pipe is connected to the mixing chamber (231).

6. The boiler ammonia injection regulating device according to claim 5, characterized in that: A filter screen is installed on the suction port (236).

7. The boiler ammonia injection regulating device according to claim 6, characterized in that: A telescopic member (26) is also installed at the tail of the denitration spray gun (21), and the telescopic end of the telescopic member (26) is connected to the denitration column (23) via a connecting rod (27).

Images