Gas film cooler and anti-blocking device for tail gas of glass curing smelting furnace

Abstract

The invention relates to a gas film cooler and a glass curing tail gas smelting furnace anti-blocking device comprising the gas film cooler, the gas film cooler is arranged at the lower end of the device and consists of a gas inlet pipe, an outer pipe, an inner pipe, a middle pipe, an upper gas distributor, an air knife, a bottom gas distributor and a tail gas inlet, the device has the functions of feeding smelting furnace tail gas, cooling the tail gas and preventing tail gas particles from depositing on a pipe wall to block and corrode a pipeline; the upper end of the device further comprises a connecting pipe, the connecting pipe is composed of a straight pipe part, a bent pipe part, an access hole sealing plate and a reversible flush valve, the straight pipe part is used for depositing tail gas particles and providing a dredging and overhauling channel for the connecting pipe and the gas film cooler, and tail gas is led to the wet dust collector through the bent pipe part. Purging airflow is formed through the structural design, particulate matter deposition is prevented from corroding and blocking a pipeline, the overhauling dredging opening is provided for dredging the pipeline conveniently, and stable operation of a tail gas treatment system is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of radioactive waste glass solidification, and specifically is an air film cooler and an exhaust gas anti-blocking device for a radioactive waste liquid glass solidification furnace including the air film cooler. The device is used to delay the deposition of particles and can be used to clear and flush pipelines. Background Art

[0002] Vitrification is currently recognized as the best solution for treating high-level radioactive waste in the world, and it is also the only high-level radioactive waste disposal method that has been applied in engineering in the world. The continuous development of the vitrification system has improved the long-term stability of the vitrified body, and the development of the vitrification process technology has promoted the industrialization and commercialization of nuclear waste vitrification. So far, the nuclear waste vitrification process technology has experienced a one-step tank process, a two-step process of a rotary calcining furnace plus an induction heating metal melting furnace, a Joule heating ceramic furnace, and a cold crucible induction heating process.

[0003] Tail gas treatment is one of the key technologies in the high-level waste vitrification process. During the vitrification process, nitrogen oxides, volatiles, particulate matter and water vapor in the furnace are extracted by the induced draft fan and enter the wet dust collector through the pipeline for dust removal. The high-temperature tail gas from the furnace has a temperature of about 400-600℃. At the same time, because it contains water vapor, the particulate matter and volatile matter in the tail gas are easily deposited on the pipeline at the outlet of the furnace. Excessive deposition will cause pipeline blockage. At the same time, the pipeline is severely corroded by the combined effects of water vapor, nitrogen oxides, volatiles and particulate matter, which affects the service life of the pipeline.

[0004] In order to solve the problem of blockage of cold crucible tail gas pipeline, the French Atomic Energy Commission document (Cold Crucible Induction Melter (CCIM) Demonstration Using a Representative Savannah River Site Sludge Simulant On the Large-Size Pilot Platform at the CEA-Marcoule, GIROLD C et al.; proceedings of the 2008 Waste Management Symposium, 2008.) proposed that at the tail gas outlet of the cold crucible furnace, a mechanical vibration device is installed in the vertical section to return the sediment to the furnace, and a water injection device is installed in the horizontal section to allow possible sediment to flow to the wet dust collector with water. At the same time, a temperature and pressure measuring device is installed on the pipeline to monitor whether the tail gas pipeline is blocked. This solution alleviates the blockage problem of the exhaust pipe to a certain extent. However, it cannot solve the deposition of exhaust particles at the bends of the exhaust pipe, especially after water is sprayed in the horizontal pipe. The deposited particles are hardened under the action of water and the heating of the high-temperature exhaust gas. In this case, even if mechanical vibration is used, the pipe deposits cannot be removed by vibration. Only this part of the pipe can be replaced to ensure the normal operation of the exhaust system.

[0005] The Joule-heated ceramic furnace of the Hanford Vitrification Plant (WTP) in the United States adopts a slurry feeding method (LAW Primary Offgas Process (LOP) and LAW Secondary Offgas / Vessel Vent Process (LVP) System Design Description, MARKMAN D, KRUGERA. et al; ORP-68769 Revision 0, 2022.). In order to avoid the blockage of the tail gas outlet of the furnace, a film cooler is provided at the tail gas outlet of the furnace. The film cooler takes in compressed air from the air inlet at the upper end. After the air flow enters the bottom end of the film cooler, it turns back upward, and then the gas is blown out from the louver gap inside the film cooler and flows downstream along the inner wall. The tail gas of the furnace enters from the tail gas inlet of the film cooler. At the same time, a dotted air outlet is also opened at the bottom of the film cooler to prevent the volatile particles in the furnace from being deposited at the bottom of the film cooler as much as possible. This design allows the inner wall of the film cooler to be cooled by compressed air and prevents volatiles and particles from being deposited in the film cooler. However, in actual applications, since there is a certain angle between the blowing direction of the louver and the inner wall of the pipe, particles are still deposited on the inner wall of the film cooler, causing blockage. Secondly, the point openings in the direction of the air inlet of the film cooler cannot completely prevent the deposition of particles. Since the deposited particles are highly corrosive, the bottom of the film cooler is severely corroded. Thirdly, the film cooler is only equipped with one air inlet, and there is no gas distributor inside the film cooler. The gas flow distribution inside the film cooler is uneven, which causes serious local particle deposition during use, leading to blockage. Fourth, the pipe at the bend leading to the wet dust collector of the exhaust gas treatment system is the most prone to blockage, but the document does not provide a solution for preventing blockage and unblocking the pipe from the film cooler to the wet dust collector.

[0006] The Joule-heated ceramic furnace of the German VEK vitrification plant adopts the liquid feeding method (Cold demonstration of the VEK vitrification technology in a full-scale mock-up facility GRüNEWALD W, ROTH G, TOBIE W, et al., WM'00 conference, 2000.). The tail gas of the furnace is discharged from the top of the furnace and enters the vertical pipe and the horizontal pipe in turn. The vertical pipe and the horizontal pipe are equipped with independent cleaning devices to prevent the deposition of particles. The principle is based on air shock wave cleaning. Within a few milliseconds, several liters of compressed air are released to generate extremely effective ultrasonic waves, which cause the particles on the wall of the tail gas pipe to fall off. However, this scheme easily causes fluctuations in the furnace pressure inside the furnace, thereby causing fluctuations in the furnace glass solidification process. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an air film cooler and an anti-blocking device for tail gas of a high-level waste liquid glass solidification furnace including the air film cooler, which is suitable for the tail gas intake, tail gas cooling and connecting the glass solidification furnace and the wet dust collector of the high-level waste liquid glass solidification furnace. The device includes an air film cooler and a connecting pipe. The function of the air film cooler is the tail gas intake and tail gas cooling of the glass solidification furnace. It is composed of an upper gas distributor, an air intake pipe, an outer pipe, an intermediate pipe, an inner pipe, an air knife assembly, a bottom gas distributor and a tail gas inlet; the function of the connecting pipe is to connect the air film cooler and the wet dust collector, and it is composed of a straight pipe part, a curved pipe part, an inspection port sealing plate, a variable direction flushing valve, etc. When the air film cooler and the connecting pipe are working, the compressed air in the two air intake side pipes enters the cavity between the outer pipe and the inner pipe, and then flows downward after being evenly distributed by the upper gas distributor. A part of the compressed air is blown out through the bottom air outlet to prevent particles from depositing and corroding the bottom of the film cooler. The remaining compressed air returns upward and enters the middle tube and several internal wind knives stacked to form a cavity, flows to the inner wall of the film cooler through the gap between two adjacent wind knives and flows along the inner wall, and the exhaust gas in the furnace flows in the center of the film cooler, which delays the deposition of particles on the inner wall of the film cooler and cools the exhaust gas and the film cooler. The exhaust gas of the furnace and the compressed air blown out of the film cooler then enter the connecting pipe. The large particles in the exhaust gas enter the straight pipe part of the connecting pipe due to inertia and deposit there. The exhaust gas flows to the wet dust collector through the elbow part, reducing the risk of pipeline blockage caused by the deposition of exhaust gas particles at the elbow. By measuring the pressure difference between the tail gas of the furnace and the connecting pipe, the deposition and blockage of particles in the film cooler and the connecting pipe can be determined. When the pressure difference is large, the inspection port at the upper end of the straight pipe of the connecting pipe can be opened to clean the particles deposited on the inner wall of the connecting pipe and the film cooler. These particles fall into the furnace and continue to melt into glass. The particles deposited on the curved pipe part of the connecting pipe can be flushed through the variable flushing valve after closing the inspection port of the straight pipe part of the connecting pipe, and the flushing sewage flows into the wet dust collector at the rear end. The exhaust anti-blockage device of the present invention can improve the operating stability and reliability of the glass solidification exhaust treatment system, and reduce the risk of shutdown and replacement of the exhaust pipe due to blockage of the exhaust pipe.

[0008] The technical solution adopted by the present invention is as follows:

[0009] An air film cooler, characterized in that it is composed of an upper gas distributor, an air inlet pipe, an outer pipe, an intermediate pipe, an inner pipe, an air knife assembly, a bottom gas distributor and an exhaust gas inlet;

[0010] The upper gas distributor is in the shape of a ring, and the ring body is provided with through holes;

[0011] The side of the air intake pipe is provided with a through hole, which is connected to an air intake side pipe;

[0012] The lower opening of the air inlet pipe is sealed and connected to the upper opening of the outer pipe; an upper gas distributor is fixed between the air inlet pipe and the outer pipe, and an intermediate pipe is fixed on the ring of the upper gas distributor;

[0013] The intermediate tube is nested in the outer tube, and the upper end of the intermediate tube is fixed on the upper gas distributor ring body;

[0014] The upper opening of the inner tube is fixedly connected to the upper opening of the air intake pipe;

[0015] The upper opening of the outer tube and the upper opening of the intermediate tube are sealed and connected via an upper gas distributor, and the inner tube is nested in the circular ring of the upper gas distributor;

[0016] The upper gas distributor through hole is located between the outer tube and the middle tube, and is used for compressed air to enter the gap between the outer tube and the middle tube from the air inlet pipe to form a downward compressed air flow;

[0017] The upper opening of the air knife assembly is sealedly connected to the lower opening of the inner tube;

[0018] The bottom gas distributor has upper and lower openings and is shaped like a flying saucer. The inside of the saucer body is hollow. Air inlets and outlets are arranged on the upper and lower surfaces of the saucer body. The air inlet on the upper surface of the saucer body is in the shape of a slit, and the air outlet on the lower surface of the saucer body is in the shape of a hole. A step is arranged above the opening of the saucer body, and an air outlet blade is arranged on the step. The air outlet blade is in the shape of a ring-shaped constriction.

[0019] The wind knife assembly is composed of at least two wind knives stacked on each other; the wind knife has upper and lower openings and is in the shape of an inverted cup; the lower opening of the wind knife is provided with an air inlet hole, the upper opening of the wind knife is provided with a step, and the step is provided with a wind knife blade, and the wind knife blade is in the shape of a ring-shaped neck; the upper and lower wind knives are stacked in pairs, and the edge of the upper wind knife cup is inverted and sealed to the lower wind knife step; compressed air enters the lower wind knife air inlet hole and forms a purge airflow through the wind knife blade; the wind knife assembly and the inner wall of the inner tube are purged and flow upward along the inner wall to form an air film, delaying the deposition of particles on the wind knife assembly and the inner wall of the inner tube;

[0020] The lower edge of the wind knife at the bottom of the wind knife assembly is sealed and connected to the upper step of the bottom gas distributor, and the bottom gas enters the bottom wind knife air inlet hole and forms a purge airflow through the wind outlet blade of the bottom gas distributor;

[0021] The lower opening of the tail gas inlet is sealed and connected to the glass solidification furnace below, and the upper opening of the tail gas inlet is sealed and connected to the lower opening of the bottom gas distributor.

[0022] Optionally, the upper opening of the air knife assembly is sealed and welded to the lower opening of the inner tube;

[0023] Optionally, the upper opening of the air inlet pipe is fixedly connected to the upper opening of the inner pipe via a flange;

[0024] Optionally, the lower opening of the air inlet pipe and the upper opening of the outer pipe are fixed and sealed and welded at the upper gas distributor;

[0025] Optionally, the wind knife assembly has two stacked upper and lower wind knives, and the edge of the upper wind knife cup is inverted and sealed and welded to the lower wind knife step;

[0026] Optionally, the lower edge of the wind knife at the bottom of the wind knife assembly is seal-welded to the upper step of the bottom gas distributor.

[0027] The present invention also provides a glass solidification furnace tail gas anti-blocking device comprising the air film cooler, and the device also comprises a connecting pipe;

[0028] The upper opening of the air inlet pipe is sealed and connected to the lower opening of the connecting pipe;

[0029] The upper end of the connecting pipe is divided into two parts, consisting of a straight pipe part, a curved pipe part, an inspection port sealing plate, and a variable-direction flushing valve; the end of the straight pipe part is provided with an inspection port sealing plate, and the middle opening of the straight pipe part is sealed and connected with a variable-direction flushing valve; the end of the curved pipe part can be connected to a rear-end wet dust collector;

[0030] The glass solidification melting furnace tail gas anti-blocking device has a lower flange at the upper end of an air inlet pipe and an upper flange at the lower end of a connecting pipe. The air inlet pipe and the connecting pipe are sealed and connected via the lower flange and the upper flange.

[0031] Optionally, the end of the bent pipe portion is connected to a rear wet dust collector via a bent pipe flange.

[0032] The working principle of the air film cooler of the present invention is:

[0033] The compressed air enters the lower wind knife air inlet hole and forms a purge airflow through the wind knife blade; the air is blown through the wind knife assembly and the inner wall of the inner tube and flows upward along the inner wall to form an air film, delaying the deposition of particles on the wind knife assembly and the inner wall of the inner tube; the lower edge of the wind knife at the bottom of the wind knife assembly is sealed with the upper step of the bottom airflow distributor; the compressed air flows downward from the air inlet pipe into the gap between the outer tube and the middle tube, and after the bottom airflow reaches the bottom airflow distributor, part of the compressed air enters the bottom wind knife air inlet hole and forms a purge airflow through the air outlet blade of the bottom airflow distributor; part of the gas turns back upward to form an upward compressed air flow in the gap between the wind knife assembly, the inner tube and the middle tube, and the compressed air enters the lower wind knife air inlet hole and forms a purge airflow through the wind knife blade; the air is blown through the wind knife assembly and the inner wall of the inner tube and flows upward along the inner wall to form an air film, delaying the deposition of particles on the wind knife assembly and the inner wall of the inner tube;

[0034] There is an exhaust gas inlet at the bottom of the bottom gas distributor. Compressed air can form a purge airflow through the upper surface air inlet and the lower surface air outlet of the bottom gas distributor to purge the lower exhaust gas inlet to prevent particulate matter from being deposited on the exhaust gas inlet.

[0035] The tail gas anti-blocking device works as follows:

[0036] Large particles in the exhaust gas enter the straight pipe part of the connecting pipe due to inertia and settle there, while the remaining particles in the exhaust gas flow to the wet dust collector through the curved pipe part of the connecting pipe;

[0037] The exhaust gas anti-clogging device determines the deposition and blockage of particulate matter in the air film cooler and the connecting pipe by measuring the pressure difference between the furnace exhaust gas and the connecting pipe. When the pressure difference is large, the inspection port seal at the upper end of the straight pipe part of the connecting pipe can be opened to clean the particulate matter deposited on the connecting pipe, the inner pipe of the air film cooler and the inner wall of the wind knife assembly. These particulate matter falls into the glass solidification furnace and can continue to melt into glass.

[0038] The exhaust gas anti-clogging device can be used to regularly flush particulate matter deposited in the curved pipe portion of the connecting pipe through a variable-direction flushing valve, and the flushing sewage flows into the wet dust collector at the rear end.

[0039] The beneficial effects of the present invention are:

[0040] There is a purge airflow at the bottom exhaust gas inlet of the air film cooler, which can effectively reduce the inlet temperature and prevent high-temperature particles from depositing and corroding the inlet.

[0041] The interior of the film cooler is composed of several stacked wind knives, which can form a purge airflow flowing along the inner wall of the film cooler during operation, delaying the deposition of particles on the inner wall of the film cooler and reducing the risk of the film cooler being blocked by deposited particles.

[0042] The connecting pipe is divided into a straight pipe part and a curved pipe part. During operation, large particles in the exhaust gas enter the straight pipe part due to inertia, and small particles flow through the curved pipe part to the wet dust collector, reducing the risk of blockage in the curved pipe part due to particle deposition. On the other hand, the straight pipe part is equipped with an inspection flange, which can regularly clean the particles on the straight pipe part of the connecting pipe and the inner wall of the air film cooler, greatly reducing the risk of blockage in the air film cooler due to particle deposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the connecting pipe

[0044] Figure 2 Schematic diagram of the upper air inlet pipe and connecting flange of the air film cooler

[0045] Figure 3 Schematic diagram of the upper air flow distributor of the air film cooler

[0046] Figure 4 This is a cross-sectional view of a film cooler.

[0047] Figure 5This is a schematic diagram of the air knife of the air film cooler

[0048] Figure 6 This is a schematic diagram of the gas distributor, air knife assembly and inner tube assembly at the bottom of the air film cooler

[0049] Figure 7 This is a schematic diagram of two stacked air knives in a film cooler. Figure 7 A is the main view, Figure 7 B is a cross-sectional view

[0050] Figure 8 This is a schematic diagram of the gas distributor at the bottom of the film cooler. Figure 8 A is the top view, Figure 8 B is the bottom view

[0051] Fig. 9 This is a cross-sectional view of the gas distributor at the bottom of the film cooler.

[0052] Fig.10 This is a schematic diagram of the assembly of the air film cooler and connecting pipe of the glass solidification tail gas anti-blocking device DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention shall not be limited thereto.

[0054] See also Figure 4 and Fig.10As shown in the figure, a device for preventing tail gas from being blocked in a glass solidifying furnace includes a film cooler 3 and a connecting pipe 2. The function of the film cooler 3 is to intake the tail gas of the glass solidifying furnace, cool the tail gas and delay the deposition of particulate matter. It is composed of a compressed air intake pipe 4, a lower flange 6 connected to the connecting pipe 2, an upper gas distributor 12, a wind knife assembly 17 composed of several wind knives for forming an air film, an inner pipe 15, an intermediate pipe 16, an outer pipe 14, a bottom gas distributor 22 and a tail gas inlet 19. The function of the connecting pipe 2 is to connect the film cooler 3 and the wet dust collector of the tail gas system. It is composed of a straight pipe part 9, a curved pipe part 7, a maintenance port sealing plate 10, a variable flushing valve 11, an upper flange 5 connected to the film cooler, and a pipeline flange 8 connected to the wet dust collector. When the air film cooler 3 and the connecting pipe 2 are in operation, the compressed air in the two air intake side pipes of the air intake pipe 4 enters the cavity 20 between the air intake pipe 4 and the inner pipe 15, and then flows downward after being evenly distributed by the upper gas distributor 12. A part of the compressed air enters through the air inlet 25 of the bottom gas distributor 22 and is blown out from the air outlet 26 to prevent particulate matter from depositing at the bottom of the film cooler 3 and corroding the bottom of the film cooler 3. Another part of the compressed air, after reaching the bottom gas distributor 22, turns back upward through the bottom of the intermediate tube 16 and enters the intermediate tube 16 and the internal several wind knives stacked to form a cavity 18, and then first enters the bottom wind knife air inlet hole 23, and then flows to the inner wall of the film cooler 3 and flows along the inner wall after being guided by the bottom gas distributor air outlet blade 221. The remaining compressed air passes through the bottom air inlet hole 23 of the wind knife in turn and forms a purge airflow through the wind knife air outlet blade 24; purges the wind knife assembly 17 and the inner wall of the inner tube 15 and flows upward along the inner wall to form an air film, delaying the deposition of particulate matter on the wind knife assembly 17 and the inner wall of the inner tube 15; the exhaust gas in the furnace flows in the center of the film cooler 3, thereby preventing particulate matter from depositing on the inner wall of the film cooler 3 and cooling the exhaust gas and the film cooler 3. The compressed air blown out of the furnace exhaust and the air film cooler 3 then enters the connecting pipe 2. Due to inertia, the large particles in the exhaust enter the straight pipe part 9 of the connecting pipe 3 and settle. The exhaust flows to the wet dust collector through the curved pipe part 7, reducing the risk of the exhaust particles being deposited at the curved pipe and causing the pipeline to be blocked. By measuring the pressure difference between the furnace exhaust and the rear end of the connecting pipe 2, the deposition and blockage of the particles in the air film cooler 3 and the connecting pipe 2 can be judged. When the pressure difference is large, the inspection port seal 10 at the upper end of the straight pipe part 9 of the connecting pipe 2 can be opened to clean the particles deposited on the inner wall of the connecting pipe 2 and the air film cooler 3. These particles fall into the furnace and continue to melt into glass. The particles deposited in the curved pipe part 7 of the connecting pipe 2 can be flushed through the variable flushing valve 11 after closing the inspection port seal 10 of the straight pipe part 9 of the connecting pipe 2, and the flushing sewage flows into the wet dust collector at the rear end.

[0055] See also Figure 1The connecting pipe 2 includes a straight pipe portion 9, a curved pipe portion 7, an inspection port sealing plate 10, a variable direction flushing valve 11, a flange 5 connected to the air film cooler, and a pipeline flange 8 connected to the wet dust collector.

[0056] See also Figure 2 A through hole is provided on the side of the air inlet pipe 4 of the air film cooler 3, which is connected to two air inlet side pipes, and a flange 6 is connected to the upper end of the air inlet pipe 4.

[0057] See also Figure 3 The upper gas distributor 12 of the film cooler 3 is provided with a plurality of through holes 13 .

[0058] See also Figure 4 , after the compressed air of the two air intake side pipes in the air intake pipe 4 of the air film cooler 3 enters the cavity 20 between the air intake pipe 4 and the inner pipe 15, it is evenly distributed by the upper gas distributor 12 and flows downward. A part of the compressed air enters through the air inlet 25 of the bottom air flow bottom gas distributor 22 and is blown out from the air outlet 26 to prevent particles from being deposited at the bottom of the air film cooler 3 and corroding the bottom of the air film cooler 3. The other part of the compressed air, after reaching the bottom gas distributor 22, turns back upward through the bottom of the middle pipe 16 and enters the middle pipe 16 and the internal several wind knives stacked to form a cavity 18, and then first enters the bottom air inlet through hole 23 of the bottom wind knife, and is guided by the wind knife bottom gas distributor air outlet blade 221 It flows backward toward the inner wall of the air film cooler 3 and flows along the inner wall, and the remaining compressed air passes through the air inlet hole 23 at the bottom of the wind knife in turn and then forms a purge airflow through the wind knife air outlet blade 24; it purges the inner wall of the wind knife assembly 17 and the inner tube 15 and flows upward along the inner wall to form an air film, delaying the deposition of particulate matter on the inner wall of the wind knife assembly 17 and the inner tube 15; the exhaust gas in the furnace flows in the center of the air film cooler 3 to delay the deposition of particulate matter on the inner wall of the air film cooler 3 and cool the exhaust gas and the air film cooler 3.

[0059] See also Figure 5 , Figure 6 , the air film cooler 2 is further described, the wind knife is provided with a plurality of wind knife air inlet holes 23 at the bottom end, and an air outlet blade 24 at the upper end; six of the wind knives are stacked in sequence to form a wind knife assembly 17, and the bottom 29 of the upper wind knife and the mounting step 28 of the lower wind knife are welded together, and compressed air enters the wind knife air inlet hole 23 and is guided by the air outlet blade 24 to form a purge airflow flowing along the inner wall of the air film cooler 2.

[0060] See also Figure 7 , the stacking of the wind knife assembly 17 is further described, the two wind knives are stacked, the airflow enters along the bottom air inlet hole 23 of the upper wind knife, and blows out along the air outlet blade 24 of the lower wind knife, forming a purge airflow flowing along the inner wall of the air film cooler 2;

[0061] See also Figure 7, 8 9, the bottom gas distributor 22 has an air outlet blade 221 at the upper end, and the bottom gas distributor 22 and the air knife stacked thereon are welded together through the mounting step 231 and the bottom 29 of the upper air knife. The upper air knife air inlet hole 23 and the air outlet blade 221 of the bottom gas distributor 22 form a purge airflow; the bottom gas distributor 22 has a plurality of narrow slit air inlets 25, so that the compressed air flowing from the upper end of the air film cooler 3 can enter the cavity 27 in the bottom gas distributor through the narrow slit air inlet 25, and be blown out through the air outlet 26 of the bottom gas distributor 22, which is used to purge the exhaust air inlet 19 at the bottom of the air film cooler to prevent particulate matter from being deposited on the air inlet 19.

[0062] See also Fig.10 The film cooler 3 and the connecting pipe 2 are installed in the order of the connecting pipe 2, the air inlet pipe 4 (including the inner pipe 15), the upper gas distributor 12, the wind knife assembly 17, the outer pipe 14 of the film cooler 3 (including the middle pipe 16 inside), and the bottom gas distributor 22.

[0063] The use instructions of the gas film cooler and the connecting pipe of the glass solidification melting furnace of the present invention are as follows:

[0064] During the glass solidification process, nitrogen oxides, volatiles, particulate matter and water vapor in the furnace are drawn out by the induced draft fan from the furnace through the pipeline into the wet dust collector for dust removal. The high-temperature exhaust gas from the furnace is at a temperature of about 400-600°C. At the same time, because it contains water vapor, the particulate matter and volatiles in the exhaust gas are easily deposited on the pipeline at the exhaust gas outlet of the furnace. Excessive deposition will cause the pipeline to be blocked. At the same time, the pipeline is severely corroded under the combined effects of water vapor, nitrogen oxides, volatiles and particulate matter, which affects the service life of the pipeline. The anti-blocking device of a glass solidification furnace of the present invention has the functions of exhaust gas intake, exhaust gas cooling, delaying particulate matter blockage and corrosion prevention. The specific working process is as follows: the compressed air in the intake pipe is evenly distributed by the upper gas distributor and then flows downward. A portion of the compressed air is blown out through the outlet of the bottom gas distributor to prevent particles from depositing at the bottom furnace exhaust air inlet of the air film cooler. The remaining compressed air returns upward and enters the middle tube and several stacked wind knives to form a cavity. It flows to the inner wall of the air film cooler through the gap between two adjacent wind knives (the bottom is the gap between the bottom wind knife and the bottom gas distributor outlet blade) and flows along the inner wall. The exhaust gas in the furnace flows in the center of the air film cooler, which delays the deposition of particles on the inner wall of the air film cooler and cools the exhaust gas and the air film cooler. The compressed air blown out of the furnace exhaust gas and the air film cooler then enters the connecting pipe. The large particles in the exhaust gas enter the straight pipe part of the connecting pipe due to inertia and deposit there. The exhaust gas flows to the wet dust collector through the curved pipe part, reducing the risk of pipeline blockage caused by the deposition of exhaust gas particles at the curved pipe. By measuring the pressure difference between the furnace exhaust and the rear end of the connecting pipe, the deposition and blockage of particulate matter in the film cooler and the connecting pipe can be determined. When the pressure difference is large, the inspection port seal at the upper end of the straight pipe part of the connecting pipe can be opened to clean the particulate matter deposited on the inner wall of the connecting pipe and the film cooler. These particulate matter falls into the furnace and continues to melt into glass. The particulate matter deposited on the curved pipe part of the connecting pipe can be regularly flushed through a variable directional flushing valve after closing the inspection port seal of the straight pipe part of the connecting pipe, and the flushing sewage flows into the wet dust collector at the rear end. The glass solidification furnace exhaust anti-blockage device of the present invention can effectively reduce the exhaust temperature, delay the corrosion of pipelines by particulate matter deposition, and facilitate inspection and maintenance. It is an effective way to maintain the smooth operation of the glass solidification exhaust treatment device.

Claims

1. A film cooler, characterized in that: It is composed of an upper gas distributor 12, an air inlet pipe 4, an outer pipe 14, an intermediate pipe 16, an inner pipe 15, an air knife assembly 17, a bottom gas distributor 22 and an exhaust gas inlet 19; The upper gas distributor 12 is in a ring shape, and a through hole 13 is provided around the ring; The side of the air intake pipe 4 is provided with a through hole, which is connected to an air intake side pipe; The lower end of the air inlet pipe 4 is sealed and connected to the upper end of the outer pipe 14; an upper gas distributor 12 is fixed between the air inlet pipe 4 and the outer pipe 14, and an intermediate pipe 16 is fixed on the ring of the upper gas distributor 12; The intermediate tube 16 is nested in the outer tube 14, and the upper end of the intermediate tube 16 is fixed on the annular ring of the upper gas distributor 12; The upper end of the inner tube 15 is fixedly connected to the upper end of the air intake pipe 4; The upper end of the outer tube 14 and the upper end of the intermediate tube 16 are sealed and connected through the upper gas distributor 12, and the inner tube 15 is nested in the circular ring of the upper gas distributor 12; The through hole of the upper gas distributor 12 is located between the outer tube 14 and the middle tube 16, and is used for compressed air to enter the gap between the outer tube 14 and the middle tube 16 from the air inlet pipe 4 to form a downward compressed air flow; The upper end of the air knife assembly 17 is sealed and connected to the lower end of the inner tube 15; The bottom gas distributor 22 has upper and lower openings and is shaped like a flying saucer. The inside of the saucer body is hollow. Air inlets and outlets are arranged on the upper and lower surfaces of the saucer body. The air inlet 25 on the upper surface of the saucer body is in the shape of a slit, and the air outlet 26 on the lower surface of the saucer body is in the shape of a hole. A step is arranged above the opening of the saucer body, and an air outlet blade 221 is arranged on the step. The air outlet blade 221 is in the shape of a ring-shaped contraction. The wind knife assembly 17 is composed of at least two wind knives stacked on each other; the wind knife has upper and lower openings and is in the shape of an inverted cup; the lower opening of the wind knife is provided with an air inlet hole 23, the upper opening of the wind knife is provided with a step, and the step is provided with a wind knife blade 24, and the wind knife blade 24 is in the shape of a ring-shaped neck; the upper and lower wind knives stacked in pairs, the upper wind knife cup edge is inverted and sealed to the lower wind knife step; compressed air enters the lower wind knife air inlet hole 23 and forms a purge airflow through the wind knife blade 24, purges the wind knife assembly 17 and the inner wall of the inner tube 15 and flows upward along the inner wall to form an air film, delaying the deposition of particles on the wind knife assembly 17 and the inner wall of the inner tube 15; The lower edge of the bottom wind knife of the wind knife assembly 17 is sealed and connected to the upper step of the bottom gas distributor 22, and the bottom gas enters the bottom wind knife air inlet hole 23 and forms a purge airflow through the air outlet blade 221 of the bottom gas distributor 22; The lower end of the tail gas inlet 19 is sealed and connected to the glass solidification furnace below, and the upper end of the tail gas inlet 19 is sealed and connected to the lower end of the bottom gas distributor 22.

2. The film cooler according to claim 1, characterized in that: The upper end of the air knife assembly 17 is sealed and welded to the lower end of the inner tube 15 .

3. The film cooler according to claim 1, characterized in that: The upper end of the air inlet pipe 4 is fixedly connected to the upper end of the inner pipe 15 via a flange.

4. The film cooler according to claim 1, characterized in that: The lower opening of the air inlet pipe 4 and the upper opening of the outer pipe 14 are fixed and sealed and welded at the upper gas distributor 12 .

5. The film cooler according to claim 1, characterized in that: The wind knife assembly 17 has two stacked upper and lower wind knives, and the edges of the upper wind knife cups are inverted and sealed and welded to the lower wind knife steps.

6. The film cooler according to claim 1, characterized in that: The lower edge of the wind knife at the bottom of the wind knife assembly 17 is sealed and welded to the upper step of the bottom gas distributor 22 .

7. A device for preventing tail gas from being blocked in a glass solidification furnace comprising the gas mold cooler according to claim 1, characterized in that: Also includes a connecting pipe 2; The upper opening of the air inlet pipe 4 is sealed and connected to the lower opening of the connecting pipe 2; The upper end of the connecting pipe 2 is divided into two parts, consisting of a straight pipe part 9, a curved pipe part 7, an inspection port sealing plate 10, and a variable-direction flushing valve 11; the end of the straight pipe part 9 is provided with an inspection port sealing plate 10, and the middle opening of the straight pipe part 9 is sealed and connected to a variable-direction flushing valve 11; the end of the curved pipe part 7 can be connected to the rear-end wet dust collector.

8. The device for preventing tail gas from being blocked in a glass solidification furnace according to claim 7, characterized in that: A lower flange 6 is disposed at the upper end of the air inlet pipe 4 , and an upper flange 5 is disposed at the lower end of the connecting pipe 2 . The air inlet pipe 4 and the connecting pipe 2 are sealed and connected via the lower flange 6 and the upper flange 5 .

9. The device for preventing tail gas from being blocked in a glass solidification furnace according to claim 7, characterized in that: The end of the elbow portion 7 is connected to the rear wet dust collector via an elbow flange 8 .

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