Temperature reduction nozzle unblocking device, air ejector and unblocking method of air ejector

Abstract

The invention discloses a desuperheating nozzle unblocking device, an air ejector and an unblocking method thereof, and belongs to the technical field of flue gas desulfurization. The desuperheating nozzle unblocking device comprises a desuperheating water conveying assembly, the desuperheating water conveying assembly comprises a desuperheating water pipe and a nozzle, the desuperheating water pipe is a hollow pipe body, and the water outlet end of the desuperheating water pipe is connected with the nozzle; the water inlet end of the desuperheating water pipe is connected with a three-way pipe, and the desuperheating water pipe is used for conveying desuperheating water; and the unblocking assembly is arranged in the desuperheating water pipe and the three-way pipe. The desuperheating water pipe and the compressed air pipe are arranged in a sleeved mode, the air outlet end of the compressed air pipe directly faces the nozzle end of the nozzle, after the nozzle is blocked by foreign matter, the air inlet ball valve is opened, and then compressed air can be guided into the nozzle and the desuperheating water pipe through the compressed air pipe; high-pressure compressed air is used for conducting high-pressure cleaning on blockage of the nozzle, online real-time rapid cleaning of the blockage of the nozzle is achieved, cleaning is convenient and rapid, and operation is convenient and fast.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization, and in particular to a temperature reducing nozzle clearing device, an air ejector and a clearing method thereof. Background Art

[0002] At present, coal-fired power plants will produce a lot of flue gas. Due to environmental protection requirements, SO2 in the flue gas needs to be removed. The current main desulfurization method is limestone-gypsum wet desulfurization, which relies on limestone slurry as a raw material to absorb SO2 in the flue gas, react to generate GaS03·1 / 2H2O, and generate hydrated gypsum through oxidation. The oxidation process is an extremely important part of the desulfurization system of coal-fired power plants. At present, forced oxidation process is usually used at home and abroad. The process is divided into two types: fixed air injector (FAS system) and "mixer + air spray gun combined injector" (ALS system). Among them, "fixed air injector" is commonly known as "pipe network injector", and "mixer + air spray gun combined injector" is commonly known as "spear gun injector".

[0003] The oxidation process principle of the fixed air ejector is as follows: the air is transported to the oxidation air main pipe through the oxidation fan, the oxidation air main pipe distributes the air to the branch pipes (generally there are 4-8 branch pipes) through the distributor and evenly enters the absorption tower, the air ejected from the nozzles evenly distributed at the bottom of the branch pipes diffuses upward and participates in the reaction in the slurry pool of the absorption tower.

[0004] However, the oxidation air cooling water nozzle of the fixed air ejector may be clogged due to impurities in the air or poor process water quality. After the nozzle is clogged, the high-temperature air (110-130°C) in the oxidation air branch pipe is not cooled, making it impossible to manually clear or remove the clogged nozzle. On the other hand, the high-temperature air enters the oxidation air branch pipe nozzle and sprays (normal temperature ≤50°C), which can quickly take away the moisture in the slurry around the oxidation air branch pipe nozzle and form gypsum scale. The continuous accumulation of gypsum scale will clog the nozzle, causing poor air outlet and causing the oxidation air branch pipe to vibrate, resulting in the clamp falling off and the air duct breaking. Summary of the invention

[0005] The object of the present invention is to provide a desuperheating nozzle blockage clearing device, an air ejector and a desuperheating nozzle blockage clearing method, so as to solve the above-mentioned desuperheating water nozzle blockage problem.

[0006] In the first aspect, in order to achieve the above-mentioned purpose, the present invention provides a cooling nozzle blockage clearing device, which is applied to the air injector used in the flue gas desulfurization process of coal-fired power generation; the blockage clearing device comprises a cooling water delivery component and a blockage clearing component, the cooling water delivery component comprises a cooling water pipe and a nozzle, the cooling water pipe is a hollow pipe body, the water outlet end of the cooling water pipe is connected to the nozzle, the water inlet end of the cooling water pipe is connected to the tee, the cooling water pipe is used to transport the cooling water body to the nozzle, and the nozzle is used to spray the cooling water body; the blockage clearing component is arranged in the cooling water pipe and the tee, and the blockage clearing component comprises a compressed air pipe, the compressed air pipe is installed in the cooling water pipe and the tee, one end of the compressed air pipe is welded to one end of the tee, and the compressed air pipe is welded to one end of the tee. The compressed air pipe is connected to the inlet ball valve, and the outlet end of the compressed air pipe is opposite to the nozzle end of the nozzle. A gap is set between the outlet end of the compressed air pipe and the inner wall of the nozzle. The compressed air pipe is used to transport compressed gas and clear the nozzle. When in use, the compressed air is introduced into the interior of the compressed air pipe, and the compressed air pipe guides the compressed air introduced into its interior to its outlet end. The outlet end of the compressed air pipe guides the compressed air to form a high-pressure clearing air mass, and the clearing operation of the inside of the nozzle is realized through the gas thrust generated during the diffusion of the high-pressure clearing air mass, thereby reducing the deposition of blockages inside the nozzle, preventing nozzle clogging, and reducing the risk of failure of the clamp falling off and the air duct breaking caused by the vibration of the oxidation air branch pipe due to poor nozzle air outlet.

[0007] The cooling water pipe of the present invention is used for conveying cooling water. One end of the three-way pipe is connected to the cooling water pipe. The cooling water is introduced into the cooling water pipe at one end of the three-way pipe perpendicular to the cooling water pipe. The cooling water is then input into the cooling water pipe. When the nozzle is blocked due to external reasons, the inlet ball valve is opened, and the compressed gas releases the compressed air in the gap between the air outlet end of the compressed air pipe and the nozzle. The compressed air forms a high-pressure air mass inside the connection between the cooling water pipe and the nozzle. The pressure of the high-pressure air mass hits the nozzle outlet of the nozzle, and then the blockage at the nozzle outlet is cleared by the high pressure formed by the high-pressure air mass. The blockage at the nozzle outlet is cleared with high pressure, thereby realizing real-time and rapid nozzle clearing online.

[0008] As a further solution of the present invention: the cooling water pipe has a bent water outlet end, the compressed air pipe is coaxially installed in the cooling water pipe, and the bent water outlet end of the cooling water pipe is used to transport the cooling water in a different direction. The beneficial effect is that the bent water outlet end of the cooling water pipe is parallel to the oxidation air branch pipe in the air ejector, and then when the cooling water transported by the cooling water pipe is ejected through the nozzle, the ejected cooling water follows the gas flowing in the oxidation air branch pipe, so that the cooling water quickly cools the oxidation air branch pipe, and the matching compressed air pipe introduces compressed gas, so that the compressed gas clears the blocked foreign matter in the nozzle. The coaxially arranged cooling water pipe and compressed air pipe can allow the derived compressed gas to be released directly at the nozzle end, so that the compressed gas directly hits the blocked foreign matter in the nozzle, so as to achieve rapid cleaning of the blockage, and the clearing effect is good.

[0009] As a further solution of the present invention: the outlet end of the compressed air pipe is fixedly connected with a plurality of connecting pieces, the other end of the connecting piece is welded to the inner wall of the outlet end of the cooling water pipe, a cooling water flow channel is formed between the plurality of connecting pieces, and the connecting piece is used to limit the outlet end of the compressed air pipe. The beneficial effect is that the plurality of connecting pieces fix and limit the outlet end of the compressed air pipe, preventing the compressed air pipe from shaking when releasing the compressed gas, and ensuring the smooth discharge of the compressed gas.

[0010] As a further solution of the present invention: the connecting piece is a spiral piece, and a spiral cooling water flow channel is formed between several of the connecting pieces, and several of the connecting pieces form a blocking end face of the clearing air mass, which is used for pressurizing the clearing air mass. The beneficial effect is that when the compressed gas is released, the compressed air mass is led out from the air outlet end of the compressed air pipe, and the compressed air mass expands between the connecting piece and the nozzle, so that the connecting piece and the cooling water at the upper end of the connecting piece form a blocking end face, and the upper end of the compressed air mass is blocked. After the compressed air is continuously introduced, the pressure of the compressed air is concentrated between the connecting piece and the nozzle, and the clearing gas is pressurized, so that the gas has a greater pressure to clean the foreign matter that is blocking the nozzle.

[0011] As a further solution of the present invention: a funnel-shaped pressurized cavity is arranged in the nozzle, the pressurized cavity is directly opposite to the air outlet end of the compressed air pipe, and the pressurized cavity is used to accommodate the clearing air mass. The beneficial effect is that the smallest end of the pressurized cavity is directly opposite to the nozzle end of the nozzle, and the clearing air mass has a greater flow rate at the smallest end of the pressurized cavity, allowing the fast-flowing gas to impact and clear the foreign matter blocking the nozzle end of the nozzle, and cooperate with the pressurized air mass to increase the foreign matter clearing effect.

[0012] As a further scheme of the present invention: it also includes a sealing component, the sealing component includes an internal thread sealing seat; the internal thread sealing seat is internally threadedly connected to the cooling water pipe, and the internal thread sealing seat is used to position and install the cooling water pipe; a comb tooth ring is welded at one end of the internal thread sealing seat, and a sealing ring is embedded and connected in the comb tooth ring, the cooling water pipe is connected through the comb tooth ring and is in contact with the sealing ring, and the comb tooth ring and the sealing ring are used for the sealing connection of the cooling water pipe; a plugging plate is welded at the other end of the internal thread sealing seat, and the cooling water pipe is connected through the plugging plate, and the plugging plate is used to be fixedly connected to the air injector, and is in contact and sealed with the cooling water pipe through the comb tooth ring and the sealing ring. After the plugging plate is installed and connected to the air injector, the sealing property of the connection between the cooling water pipe and the internal thread sealing seat is ensured to avoid gas leakage in the air injector, and the sealing effect is good.

[0013] As a further solution of the present invention: a plurality of ribs are welded between the plugging plate and the inner thread sealing seat, the cross section of the ribs is triangular, and the plurality of ribs are used to strengthen the connection between the plugging plate and the inner thread sealing seat. The beneficial effect is that the plurality of ribs are used to strengthen the connection between the plugging plate and the inner thread sealing seat. The plurality of ribs are connected between the plugging plate and the inner thread sealing seat for strengthening the connection, making the connection of the inner thread sealing seat more stable.

[0014] In the second aspect, the present invention also provides an air injector for flue gas desulfurization in coal-fired power generation. The air injector includes a cooling nozzle clearing device, an oxidation air component and a water inlet component; the oxidation air component includes an oxidation air branch pipe, the oxidation air branch pipe is connected to a three-way flange, the blocking plate is bolted to the three-way flange, the cooling nozzle clearing device is perpendicular to the oxidation air branch pipe, the upper bolts of the three-way flange are connected to a gate valve, the cooling water transported by the cooling nozzle clearing device is used to cool the oxidation air branch pipe, and the gate valve is used to seal the three-way flange; the water inlet component includes a water inlet pipe, the water inlet pipe is connected to a water inlet ball valve, and the water outlet end of the water inlet pipe is connected to a three-way pipe.

[0015] The present invention connects a gate valve to the three-way flange, the gate valve is used for cutting off and connecting the three-way flange, the liquid outlet end of the cooling water pipe connected to the plugging plate and the inner thread sealing seat extends into the oxidation air branch pipe, the nozzle of the cooling water pipe diffuses and sprays the cooling water body, so that the cooling water body cools the oxidation air branch pipe, the cooling water body is introduced through the water inlet pipe, the water inlet ball valve on the water inlet pipe is used to open and close the water inlet pipe, the water outlet end of the water inlet pipe is detachably connected to the three-way pipe, when the cooling water pipe needs to be maintained and disassembled, the connection between the water inlet pipe and the three-way pipe is disassembled, and installation and maintenance are convenient.

[0016] As a further solution of the present invention: a gasket is arranged between the blocking plate and the three-way flange, and the gasket is made of polytetrafluoroethylene resin material. Beneficial effect The gasket arranged between the blocking plate and the three-way flange increases the sealing performance, wherein the gasket 404 made of polytetrafluoroethylene resin (PTFE) has better wear resistance, long service life and good sealing effect.

[0017] In the third aspect, the present invention also provides a method for clearing blockage in a cooling nozzle, comprising: after the nozzle is detected to be clogged, starting the cooling nozzle clearing device, introducing compressed air into the compressed air pipe in the cooling nozzle clearing device, and forming a high-pressure clearing air mass inside the nozzle for clearing the nozzle; the nozzle after clearing continues to introduce cooling water from the water inlet assembly, and the nozzle sprays the cooling water into the oxidation air branch pipe for cooling the oxidation air branch pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, the inner and outer tubes of the cooling water pipe and the compressed air pipe are sheathed, and the air outlet end of the compressed air pipe is arranged opposite to the nozzle end of the nozzle. After the nozzle is blocked by foreign matter, the inlet ball valve is opened to introduce compressed air into the nozzle and the cooling water pipe through the compressed air pipe, and the blockage in the nozzle is cleaned with high pressure by high-pressure compressed air, so that the blockage in the nozzle can be cleaned quickly and online in real time, and the cleaning is convenient and fast, and the operation is convenient.

[0020] 2. In the present invention, the passages between several spiral connecting pieces facilitate the circulation of cooling water. Meanwhile, the connecting pieces of the spiral pieces have a larger contact area. When the compressed gas is released, the outlet end of the compressed air pipe leads out a compressed air mass, which expands between the connecting piece and the nozzle, so that the connecting piece and the cooling water at the upper end of the connecting piece form an air blocking end face, thereby blocking the upper end of the compressed air mass. After the compressed air continues to be introduced, the pressure of the compressed air is concentrated between the connecting piece and the nozzle, and the clearing gas is pressurized, so that the gas has a greater pressure to clean the foreign matter blocking the nozzle, thereby further increasing the effect of cleaning the foreign matter in the nozzle, and achieving a good clearing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the temperature reduction nozzle blockage clearing device of the present invention;

[0022] Figure 2 It is a schematic diagram of the compressed air pipe connection structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the air injector of the present invention;

[0024] Figure 4 For the present invention Figure 3The enlarged structural diagram at A in the middle;

[0025] Figure 5 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0026] Figure 6 For the present invention Figure 3 The enlarged structural diagram at C in the middle;

[0027] Figure 7 For the present invention Figure 3 The enlarged structural diagram at D in the middle;

[0028] Figure 8 It is a schematic diagram of the structure of the desuperheating nozzle blockage clearing device of the present invention in use state;

[0029] Fig. 9 It is a schematic structural diagram of the temperature reducing nozzle clearing device of the present invention in a disassembled state.

[0030] In the figure: 1, cooling water delivery assembly; 101, cooling water pipe; 102, nozzle; 103, tee pipe;

[0031] 2. Clearing assembly; 201. Compressed air pipe; 202. Inlet ball valve; 203. Connecting piece; 3. Sealing assembly; 301. Internal thread sealing seat; 302. Comb ring; 303. Sealing ring; 304. Blocking plate; 305. Rib plate; 4. Oxidation air assembly; 401. Oxidation air branch pipe; 402. Three-way flange; 403. Gate valve; 404. Gasket; 5. Water inlet assembly; 501. Water inlet pipe; 502. Water inlet ball valve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example:

[0034] The invention is applied in limestone-gypsum wet desulfurization, which is the mainstream process of current coal-fired power plants. It relies on limestone slurry as raw material to absorb SO2 in flue gas, react to generate GaS03·1 / 2H2O, and generate hydrated gypsum through oxidation.

[0035] See also Figure 1-Figure 2In an embodiment of the present invention, a desuperheating nozzle blockage clearing device is applied to an air injector used in a flue gas desulfurization process for coal-fired power generation; the blockage clearing device comprises: a desuperheating water delivery component 1, the desuperheating water delivery component 1 comprises a desuperheating water pipe 101 and a nozzle 102, the desuperheating water pipe 101 is a hollow pipe body, the outlet end of the desuperheating water pipe 101 is connected to the nozzle 102, the inlet end of the desuperheating water pipe 101 is connected to the tee 103, the desuperheating water pipe 101 is used to transport the desuperheating water body to the nozzle 102, and the nozzle 102 is used to spray the desuperheating water body; the blockage clearing device also comprises a blockage clearing component 2, the blockage clearing component 2 is arranged inside the connection point of the desuperheating water pipe 101 and the tee 103, the blockage clearing component 2 comprises a compressed air pipe 201, the compressed air pipe 201 is installed inside the connection point of the desuperheating water pipe 101 and the tee 103, one end of the compressed air pipe 201 is welded to the tee 10 3, a compressed air pipe 201 is connected to an inlet ball valve 202, an outlet end of the compressed air pipe 201 is directly opposite to the nozzle end of the nozzle 102, a gap is set between the outlet end of the compressed air pipe 201 and the inner wall of the nozzle 102, and the compressed air pipe 201 is used to transport compressed gas and clear the blockage of the nozzle 102; when in use, the compressed air is introduced into the compressed air pipe 201, and the compressed air pipe 201 guides the compressed air introduced into the interior to its outlet end, and the outlet end of the compressed air pipe 201 guides the compressed air to form a high-pressure clearing air mass, and the clearing operation of the nozzle 102 is realized through the gas thrust generated during the diffusion of the high-pressure clearing air mass, thereby reducing the deposition of blockages in the nozzle 102, preventing the nozzle 102 from being blocked, and reducing the risk of the vibration of the oxidation wind branch pipe causing the clamp to fall off and the air pipe to break due to the poor air outlet of the nozzle 102.

[0036] Specifically, the air injector uses limestone slurry as a raw material to absorb SO2 in the flue gas of coal-fired power generation, and reacts to generate GaS03·1 / 2H2O. After the cooling nozzle 102 is blocked, it is unable to cool the oxidation wind branch pipe 401 of the air injector. After the inside of the oxidation wind branch pipe 401 is in a high-temperature state, the high-temperature gas quickly takes away the moisture in the slurry around the injection nozzle on the oxidation wind branch pipe 401 to form gypsum scale, causing the injection nozzle to be continuously and cumulatively blocked, and then causing the oxidation wind branch pipe 401 to vibrate, fall off and break. It is very necessary to clear the cooling nozzle 102. The cooling water pipe 101 in the cooling nozzle blockage clearing device is used to transport cooling water. One end of the three-way pipe 103 is connected to the cooling water pipe 101. The cooling water is introduced into the cooling water pipe 101 at one end of the three-way pipe 103 perpendicular to the cooling water pipe 101. The nozzle 102 at the outlet end of the cooling water pipe 101 diffuses and sprays the cooling water. The sprayed cooling water is used to cool the oxidation air branch pipe 401. The compressed air pipe 201 is fixedly installed at one end of the three-way pipe 103 by welding. When the nozzle 102 is blocked due to external reasons, the air injector detects that the oxidation air branch pipe 401 of the single-stage cooling system is blocked. 1 temperature is greater than 100 degrees Celsius. If the air injector detects that the temperature of the oxidation air branch pipe 401 of the two-stage cooling system is greater than 70 degrees Celsius, the nozzle 102 can be judged to be in a blocked state at this time. The inlet ball valve 202 is opened, and one end of the inlet ball valve 202 is connected to the compressed gas pipeline to introduce compressed gas (greater than or equal to 0.7Mpa) into the compressed air pipe 201. The compressed air pipe 201 is arranged in the cooling water pipe 101. The compressed gas is released in the gap between the outlet end of the compressed air pipe 201 and the nozzle 102. The compressed air is released in the cooling water pipe 101 and the nozzle 102. A high-pressure air mass is formed inside the connection 02, and the pressure of the high-pressure air mass hits the nozzle of the nozzle 102, and then the blockage at the nozzle of the nozzle 102 is cleared by the high pressure formed by the high-pressure air mass, so that the blockage at the nozzle of the nozzle 102 can be cleared with high pressure, and the nozzle 102 can be cleared quickly and in real time online, and cooling water is sprayed on the oxidation air branch pipe 401 to keep the oxidation air branch pipe 401 at a normal temperature, so as to avoid the oxidation air branch pipe 401 from being overheated, causing the injection nozzle of the oxidation air branch pipe 401 to be blocked by gypsum scale, thereby reducing the risk of vibration and breakage of the oxidation air branch pipe 401.

[0037] In the present invention, the cooling water pipe 101 and the compressed air pipe 201 are sleeved with each other, and the air outlet end of the compressed air pipe 201 is arranged opposite to the nozzle end of the nozzle 102. When the nozzle 102 is blocked by foreign matter, the inlet ball valve 202 is opened to introduce the compressed air into the nozzle 102 and the cooling water pipe 101 through the compressed air pipe 201. The blockage in the nozzle 102 is cleaned with high pressure by the high-pressure compressed air, so that the blockage in the nozzle 102 can be cleaned quickly and online in real time. The cleaning is quick and convenient, and the operation is convenient.

[0038] Furthermore, the gap between the air outlet end of the compressed air pipe 201 and the inner wall of the nozzle 102 is 3-7 mm. When the gap between the air outlet end of the compressed air pipe 201 and the inner wall of the nozzle 102 is 5 mm, the compressed air has a better storage space, allowing the expanded air mass to clean the foreign matter blocking the inside of the nozzle 102, thereby ensuring the online cleaning of the nozzle 102.

[0039] Preferably, Figure 1 As shown, the cooling water pipe 101 has a bent water outlet end, and the compressed air pipe 201 is coaxially installed in the cooling water pipe 101. The bent water outlet end of the cooling water pipe 101 is used to transport the cooling water in a different direction. The bent water outlet end of the cooling water pipe 101 is parallel to the oxidation air branch pipe 401 in the air ejector, so that when the cooling water transported by the cooling water pipe 101 is ejected through the nozzle 102, the ejected cooling water follows the gas flowing in the oxidation air branch pipe 401, so that the cooling water quickly cools the oxidation air branch pipe 401, and the matching compressed air pipe 201 introduces compressed gas, so that the compressed gas clears the blocking foreign matter of the nozzle 102. The coaxially arranged cooling water pipe 101 and the compressed air pipe 201 can allow the derived compressed gas to be released directly at the nozzle end of the nozzle 102, so that the compressed gas directly hits the blocking foreign matter of the nozzle 102, so as to quickly clean the blockage, and the clearing effect is good.

[0040] Preferably, Figure 2 As shown, the outlet end of the compressed air pipe 201 is fixedly connected with a plurality of connecting pieces 203, and the other end of the connecting piece 203 is welded to the inner wall of the outlet end of the cooling water pipe 101, and a cooling water flow channel is formed between the plurality of connecting pieces 203, and the connecting piece 203 is used to limit the outlet end of the compressed air pipe 201. The plurality of connecting pieces 203 connected to the compressed air pipe 201 are connected to the inner wall of the outlet end of the cooling water pipe 101, and the channel formed between the plurality of connecting pieces 203 is used for the circulation of cooling water, and the plurality of connecting pieces 203 are used to fix and limit the outlet end of the compressed air pipe 201, so as to prevent the compressed air pipe 201 from shaking when releasing the compressed gas, and ensure the smooth export of the compressed gas.

[0041] Preferably, Figure 2As shown, the connecting piece 203 is a spiral piece, and a spiral cooling water flow channel is formed between several connecting pieces 203, and several connecting pieces 203 form a blocking end face of the clearing air mass, which is used for the pressurization of the clearing air mass. The channel between several spiral connecting pieces 203 is convenient for the circulation of cooling water, and the connecting piece 203 of the spiral piece has a larger contact area. When the compressed gas is released, the compressed air mass is guided out of the air outlet end of the compressed air pipe 201, and the compressed air mass expands between the connecting piece 203 and the nozzle 102, so that the connecting piece 203 and the cooling water at the upper end of the connecting piece 203 form a blocking end face, and the compressed air mass is blocked at the upper end. After the compressed air is continuously introduced, the pressure of the compressed air is concentrated between the connecting piece 203 and the nozzle 102, and the clearing gas is pressurized, so that the gas has a greater pressure to clean the foreign matter blocking the nozzle 102, further increasing the cleaning effect of the foreign matter in the nozzle 102, and the clearing effect is good.

[0042] Preferably, Figure 1 As shown, a funnel-shaped pressurized cavity is provided in the nozzle 102, and the pressurized cavity is directly opposite to the air outlet end of the compressed air pipe 201, and the pressurized cavity is used to accommodate the clearing air mass. A hole-shaped pressurized cavity is provided in the nozzle 102, and the smallest end of the pressurized cavity is directly opposite to the nozzle end of the nozzle 102. The clearing air mass has a greater flow rate at the smallest end of the pressurized cavity, so that the fast-flowing gas impacts and clears the foreign matter blocked at the nozzle end of the nozzle 102, and cooperates with the pressurized air mass to increase the foreign matter clearing effect.

[0043] Preferably, Figure 1As shown, it also includes a sealing component 3, which includes an internal thread sealing seat 301; the internal thread sealing seat 301 is internally threadedly connected to the cooling water pipe 101, and the internal thread sealing seat 301 is used to position and install the cooling water pipe 101; a comb ring 302 is welded at one end of the internal thread sealing seat 301, and a sealing ring is embedded and connected in the comb ring 302, and the cooling water pipe 101 is connected through the comb ring 302 and is in contact with the sealing ring 303, and the comb ring 302 and the sealing ring are used for the sealing connection of the cooling water pipe 101; a plugging plate 304 is welded at the other end of the internal thread sealing seat 301, and the cooling water pipe 101 is connected through the plugging plate 304, and the plugging plate 304 is used to be fixedly connected to the air injector. The inner thread sealing seat 301 is welded with a plugging plate 304, and the plugging plate 304 is fixedly connected to the air ejector by bolts. The cooling water pipe 101 is threadedly connected in the inner thread sealing seat 301, and the cooling water pipe 101 is fixed by the inner thread sealing seat 301. A comb ring 302 is welded at one end of the inner thread sealing seat 301, and a sealing ring is installed in the comb ring 302. The comb ring 302 and the sealing ring are in contact and sealed with the cooling water pipe 101. After the plugging plate 304 is installed and connected to the air ejector, the sealing property of the connection between the cooling water pipe 101 and the inner thread sealing seat 301 is ensured to avoid gas leakage in the air ejector, and the sealing effect is good. At the same time, the threaded cooling water pipe 101 can be disassembled during maintenance, and then the cooling water pipe 101 can be moved as a whole to facilitate later maintenance operations.

[0044] Preferably, Figure 1 As shown, a plurality of ribs 305 are welded between the plugging plate 304 and the inner thread sealing seat 301. The cross section of the ribs 305 is triangular, and the plurality of ribs 305 are used to strengthen the connection between the plugging plate 304 and the inner thread sealing seat 301. A plurality of ribs 305 are connected between the plugging plate 304 and the inner thread sealing seat 301 for strengthening the connection, so that the connection of the inner thread sealing seat 301 is more stable.

[0045] See also Figure 3-Figure 9 The present invention provides an air injector for flue gas desulfurization in coal-fired power generation, comprising a cooling nozzle clearing device, an oxidation air component 4 and a water inlet component 5; the oxidation air component 4 comprises an oxidation air branch pipe 401, the oxidation air branch pipe 401 is connected to a three-way flange 402, a blocking plate 304 is bolted to the three-way flange 402, the cooling nozzle clearing device is perpendicular to the oxidation air branch pipe 401, the upper bolt of the three-way flange 402 is connected with a gate valve 403, the cooling water delivered by the cooling nozzle clearing device is used for cooling the oxidation air branch pipe 401, and the gate valve 403 is used to seal the three-way flange 402; the water inlet component 5 comprises a water inlet pipe 501, the water inlet pipe 501 is connected to a water inlet ball valve 502, and the water outlet end of the water inlet pipe 501 is connected to the three-way pipe 103.

[0046] The oxidation air branch pipe 401 is used to introduce high-temperature oxidation air. The oxidation air branch pipe 401 is connected to a three-way flange 402, and the three-way flange 402 is connected to a plugging plate 304. The cooling nozzle plugging device is connected to the oxidation air branch pipe 401. The three-way flange 402 is connected to a gate valve 403 (the gate valve 403 is a rising stem gate valve). The gate valve 403 is used to cut off and connect the three-way flange 402. The plugging plate 304 and the inner thread sealing seat 301 are connected to the liquid outlet of the cooling water pipe 101, which extends to the oxidation air branch pipe 401. 01, the nozzle 102 of the cooling water pipe 101 diffuses and sprays the cooling water to allow the cooling water to cool the oxidation air branch pipe 401. The cooling water is introduced through the water inlet pipe 501. The water inlet ball valve 502 on the water inlet pipe 501 is used to open and close the water inlet pipe 501. The outlet end of the water inlet pipe 501 is detachably connected to the three-way pipe 103. When the cooling water pipe 101 needs to be disassembled for maintenance, the connection between the water inlet pipe 501 and the three-way pipe 103 is disassembled, and installation and maintenance are convenient.

[0047] Preferably, Figure 6 As shown, a gasket 404 is provided between the plugging plate 304 and the three-way flange 402, and the gasket 404 is made of polytetrafluoroethylene resin material. The gasket 404 provided between the plugging plate 304 and the three-way flange 402 increases the sealing performance, wherein the gasket 404 made of polytetrafluoroethylene resin (PTFE) has better wear resistance, long service life, and good sealing effect.

[0048] Among them, the compressed air pipe 201 and the inlet ball valve 202 are detachably connected. When the compressed air pipe 201 needs to be disassembled, the compressed air pipe 201 and the inlet ball valve 202 are disassembled to facilitate the disassembly and maintenance of the compressed air pipe 201. The detachable connection method between the water inlet pipe 501 and the three-way pipe 103 and the detachable connection method between the compressed air pipe 201 and the inlet ball valve 202 both include detachable connection methods such as snap connection and threaded connection.

[0049] Normal state (such as Figure 8 As shown in the figure, when the nozzle 102 is blocked for a long time and cannot be cleared by introducing high-pressure gas, the cooling water pipe 101 can be disassembled to clear the nozzle 102 at the outlet end of the cooling water pipe 101. The disassembly steps are as follows:

[0050] S1. The gate valve 403 is kept open, and the compressed air inlet ball valve 202 and the cooling water inlet ball valve 502 are closed;

[0051] S2. Remove the inlet ball valve 202 at one end of the compressed air pipe 201, remove the water inlet pipe 501 connected to the tee pipe 103, and drain the compressed air pipe 201, the tee pipe 103 and the cooling water pipe 101, and the remaining water and gas;

[0052] S3. Rotate the compressed air pipe 201 counterclockwise until the hollow conical nozzle 102 is between the comb ring 302 and the rising stem gate valve (such as Fig. 9 As shown), tighten the rising stem gate valve disc clockwise to close the rising stem gate valve;

[0053] S4. Remove the connecting bolts of the three-way flange 402 and the plugging plate 304 in a counterclockwise direction;

[0054] S5. Remove the gasket 404, remove the cooling water pipe 101, the compressed air pipe 201 and the sealing assembly 3;

[0055] S6. Use a needle-shaped object to clear the hollow conical nozzle 102 to achieve manual clearing of the nozzle 102;

[0056] S7. Reinstall according to the above steps in reverse order.

[0057] A method for clearing blockage in a cooling nozzle comprises starting a cooling nozzle clearing device after blockage is detected in the nozzle, introducing compressed air into a compressed air pipe 201 in the cooling nozzle clearing device, and forming a high-pressure clearing air mass inside the nozzle 102 for clearing the blockage in the nozzle 102; the nozzle 102 after clearing the blockage continues to introduce cooling water from a water inlet assembly 5, and the nozzle 102 sprays the cooling water into an oxidation air branch pipe 401 for cooling the oxidation air branch pipe 401.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cooling nozzle clearing device, characterized in that , used in the air injector used in the flue gas desulfurization process of coal-fired power generation; the clearing device includes: A cooling water delivery component, the cooling water delivery component comprises a cooling water pipe and a nozzle, the cooling water pipe is a hollow pipe body, the water outlet end of the cooling water pipe is connected to the nozzle, the water inlet end of the cooling water pipe is connected to the tee pipe, and the cooling water pipe is used to transport cooling water; A clearing assembly, the clearing assembly is arranged in the desuperheating water pipe and the three-way pipe, the clearing assembly includes a compressed air pipe, the compressed air pipe is installed in the desuperheating water pipe and the three-way pipe, one end of the compressed air pipe is welded to one end of the three-way pipe, the compressed air pipe is connected to the inlet ball valve, the air outlet end of the compressed air pipe is directly opposite to the nozzle end of the nozzle, a gap is set between the air outlet end of the compressed air pipe and the inner wall of the nozzle, and the compressed air pipe is used to transport compressed gas and clear the nozzle; When in use, compressed air is introduced into the compressed air pipe, and the compressed air is discharged from the air outlet of the compressed air pipe to form a high-pressure clearing air mass to clear the nozzle.

2. The desuperheating nozzle clearing device according to claim 1, characterized in that: The cooling water pipe has a bent water outlet end, and the compressed air pipe is coaxially installed in the cooling water pipe. The bent water outlet end of the cooling water pipe is used for changing the direction of conveying the cooling water.

3. The desuperheating nozzle clearing device according to claim 1, characterized in that: The air outlet end of the compressed air pipe is fixedly connected with a plurality of connecting plates, the other end of the connecting plates is welded to the inner wall of the water outlet end of the cooling water pipe, a cooling water flow channel is formed between the plurality of connecting plates, and the connecting plates are used to limit the air outlet end of the compressed air pipe.

4. The desuperheating nozzle clearing device according to claim 3 is characterized in that: The connecting piece is a spiral piece, and a spiral cooling water flow channel is formed between a plurality of the connecting pieces. A plurality of the connecting pieces form a clearing air mass blocking end surface, which is used for pressurizing the clearing air mass.

5. The desuperheating nozzle clearing device according to claim 4, characterized in that: A funnel-shaped pressurized cavity is arranged in the nozzle, and the pressurized cavity is directly opposite to the air outlet end of the compressed air pipe, and the pressurized cavity is used to accommodate the clearing air mass.

6. The desuperheating nozzle clearing device according to claim 5, characterized in that: Also included is a sealing assembly, the sealing assembly including an inner thread sealing seat; The inner thread sealing seat is internally threadedly connected to the cooling water pipe, and the inner thread sealing seat is used to position and install the cooling water pipe; A comb tooth ring is welded at one end of the inner thread sealing seat, a sealing ring is embedded in the comb tooth ring, the cooling water pipe is connected through the comb tooth ring and contacts the sealing ring, and the comb tooth ring and the sealing ring are used for sealing connection of the cooling water pipe; A plugging plate is welded to the other end of the inner thread sealing seat, the cooling water pipe is connected through the plugging plate, and the plugging plate is used to be fixedly connected to the air injector.

7. The desuperheating nozzle clearing device according to claim 6, characterized in that: A plurality of ribs are welded between the blocking plate and the inner thread sealing seat, wherein the cross section of the ribs is triangular, and the plurality of ribs are used to strengthen the connection between the blocking plate and the inner thread sealing seat.

8. An air ejector, characterized in that: The air ejector comprises a desuperheating nozzle clearing device, an oxidizing air component and a water inlet component as described in any one of claims 1 to 7; The oxidation wind assembly includes an oxidation wind branch pipe, the oxidation wind branch pipe is connected to a three-way flange, the plugging plate is bolted to the three-way flange, the temperature-reducing nozzle plugging device is vertically connected to the oxidation wind branch pipe, the upper bolt of the three-way flange is connected to a gate valve, the temperature-reducing water delivered by the temperature-reducing nozzle plugging device is used to cool the oxidation wind branch pipe, and the gate valve is used to seal the three-way flange; The water inlet assembly comprises a water inlet pipe, the water inlet pipe is connected to a water inlet ball valve, and the water outlet end of the water inlet pipe is connected to a three-way pipe.

9. The air injector according to claim 8, characterized in that: A gasket is arranged between the blocking plate and the three-way flange, and the gasket is made of polytetrafluoroethylene resin material.

10. A method for clearing blockage of an air ejector, characterized in that: Applied to the air injector according to any one of claims 8 to 9, the blockage clearing method comprises: After the nozzle is detected to be clogged, the temperature-reducing nozzle clearing device is started, compressed air is introduced into the compressed air pipe in the temperature-reducing nozzle clearing device, and a high-pressure clearing air mass is formed inside the nozzle for clearing the nozzle; After being cleared, the nozzle continues to introduce the cooling water of the water inlet assembly, and the nozzle sprays the cooling water into the oxidation air branch pipe to cool the oxidation air branch pipe.

Images