CN211902391U - Device is prevented leaking by catalytic unit flue gas - Google Patents

Abstract

The utility model discloses a device is prevented leaking by catalytic unit flue gas, include the auxiliary line that communicates with exhaust-heat boiler and flue gas desulfurization device respectively, exhaust-heat boiler and flue gas desulfurization device all communicate the auxiliary line water seal tank through the auxiliary line, the end of giving vent to anger of the auxiliary line of cartridge at the auxiliary line water seal tank extends to the end lower part in the auxiliary line water seal tank, the auxiliary line water seal tank communicates the chimney through the blast pipe, the bottom intercommunication of auxiliary line water seal tank has first circulating pipe, the below of blast pipe is equipped with the overflow pipe of intercommunication auxiliary line water seal tank, the auxiliary line water seal tank communicates the overflow tank through the overflow pipe, the lower extreme of overflow pipe extends to the bottom in the overflow tank, the overflow tank from last intercommunication in proper order has step-down drain pipe and pressure boost inlet tube. The utility model discloses can make the flue subline reach zero leakage, make catalytic unit's flue gas all discharge after desulfurization system handles to the environmental protection hidden danger that the long period run of remove device exists.

Description

Device is prevented leaking by catalytic unit flue gas

Technical Field

The utility model relates to a device is prevented leaking by catalytic unit flue gas.

Background

The oil refinery catalytic unit waste heat boiler and the flue gas desulfurization device are respectively provided with a secondary line for coping with the sudden situation of the main line, the secondary lines on the oil refinery catalytic unit waste heat boiler and the flue gas desulfurization device are directly communicated with a chimney, the secondary lines of the oil refinery catalytic unit waste heat boiler secondary line flue gas desulfurization device are respectively provided with a set of flue butterfly valve for controlling whether the secondary lines are started, but the rubber elastomer in the flue butterfly valve is in a high-temperature corrosive flue gas environment containing catalyst dust particles for a long time, the flue butterfly valve is easy to cause the phenomenon of internal leakage of flue gas, so that partial flue gas is directly discharged to the chimney, and the waste heat loss and the hidden danger of environmental protection exist; meanwhile, when the waste heat boiler breaks down and needs to be maintained, a flue butterfly valve is arranged on an air inlet pipeline of the waste heat boiler to be opened or closed, and when the waste heat boiler is maintained, the rubber elastomer in the flue butterfly valve on the air inlet pipeline is in a corrosive flue gas environment containing catalyst dust particles due to the fact that the rubber elastomer is at high temperature for a long time, and the phenomenon of internal leakage of flue gas is easy to occur in the flue butterfly valve. Because the characteristics of the flue butterfly valve are limited, zero leakage cannot be realized, and the effect of complete sealing cannot be achieved if the flue butterfly valve is continuously replaced or maintained.

Disclosure of Invention

The utility model discloses the technical problem that needs to solve provides a device is prevented leaking by catalytic unit flue gas, can make the flue subline reach zero leakage, makes catalytic unit's flue gas all discharge after desulfurization system handles to the environmental protection hidden danger that the long periodic motion of remove device exists.

For solving foretell technical problem, the utility model discloses an including the auxiliary line that communicates with exhaust-heat boiler, step-down orifice plate and flue gas desulphurization device respectively, its structural feature is that exhaust-heat boiler, step-down orifice plate and flue gas desulphurization device all communicate the auxiliary line water seal tank through the auxiliary line, and the cartridge extends to the bottom lower part in the auxiliary line water seal tank at the end of giving vent to anger of the auxiliary line of auxiliary line water seal tank, the auxiliary line water seal tank communicates the chimney through the blast pipe, the bottom of auxiliary line water seal tank communicates escape canal and last water component respectively through first circulating pipe, is equipped with the overflow pipe on the auxiliary line water seal tank, the overflow pipe is located blast pipe horizontal position below, the auxiliary line water seal tank communicates the overflow jar through the overflow pipe, and the lower extreme of overflow pipe extends to the bottom lower part in the overflow jar.

The auxiliary line water-sealed tank is provided with an air inlet hole, an adjusting hole and an exhaust hole, the air inlet hole and the exhaust hole are located on the same horizontal position, the adjusting hole is located below the exhaust hole, the auxiliary line penetrates through the air inlet hole, the exhaust pipe is communicated with the exhaust hole, and the overflow pipe is communicated with the adjusting hole.

The first circulating water pipe comprises a main pipeline, one end of the main pipeline is communicated with the bottom of the secondary line water seal tank, the other end of the main pipeline is communicated with a circulating water inlet pipe and a waste water drainage pipe which are arranged in parallel, the drainage end of the waste water drainage pipe is communicated with a drainage ditch, a gate valve is arranged on the waste water drainage pipe, the water inlet end of the circulating water inlet pipe is communicated with a water feeding part, and the gate valve is arranged on the circulating water inlet pipe.

The water inlet end and the water outlet end of the gate valve of the circulating water inlet pipe are connected in parallel with branches, and the branches are sequentially provided with the gate valve and the throttle orifice plate.

The lower part of overflow jar is equipped with the level gauge, the intercommunication has overflow drain pipe and overflow inlet tube on the overflow jar, the overflow jar communicates the escape canal through the overflow drain pipe, the overflow jar communicates the parts of intaking through the overflow inlet tube.

A flue butterfly valve can be arranged on the auxiliary line.

The exhaust-heat boiler passes through intake pipe and step-down orifice plate intercommunication, the intake pipe includes first air-feed pipe, maintenance water seal tank and second air-feed pipe, and the end of giving vent to anger that first air-feed pipe inserted maintenance water seal tank and first air-feed pipe extends to the bottom lower part in the maintenance water seal tank, the lateral wall of maintenance water seal tank pass through the second air-feed pipe with exhaust-heat boiler's inlet end intercommunication, the bottom of maintenance water seal tank communicates escape canal and water-feeding part respectively through second circulating water pipe.

When the utility model is used, when the main line of the waste heat boiler and the flue gas desulfurization device normally runs, the auxiliary line needs to be closed, namely the auxiliary line is not started, the circulating water is injected into the auxiliary line water seal tank through the first circulating water pipe by the water feeding part, and the liquid level of the circulating water in the auxiliary line water seal tank is higher than the position of the air outlet end of the auxiliary line in the auxiliary line water seal tank, so that the pressure in the auxiliary line water seal tank is higher than the pressure in the auxiliary line, thereby realizing the water seal of the auxiliary line; when the problem appears in the thread of exhaust-heat boiler and flue gas desulphurization device and the auxiliary line needs to be adopted, the water feeding part discharges the circulating water from the auxiliary line water seal tank through the first circulating water pipe, the flue gas can enter the auxiliary line water seal tank to be discharged, meanwhile, the circulating water is arranged in the first circulating water pipe and the overflow tank to achieve the effect of water seal, the leakage of the flue gas when passing through the auxiliary line water seal tank is avoided, the zero leakage of the flue auxiliary line is achieved, the flue gas of the catalytic device is discharged after being treated by the desulphurization system, and therefore the environmental protection hidden danger existing in the long-period operation of the device is eliminated.

Drawings

The invention will be further explained with reference to the following figures and examples:

FIG. 1 is a schematic diagram of a catalytic device according to the prior art;

fig. 2 is a schematic structural diagram of the present invention;

FIG. 3 is a schematic view of the construction of the secondary line water-sealed tank of FIG. 2;

fig. 4 is a schematic view of the sub-line of fig. 2 in a non-use state.

In the figure: 1-waste heat boiler, 2-pressure reducing pore plate, 3-flue gas desulfurization device, 4-exhaust pipe, 5-secondary line, 6-flue butterfly valve, 7-chimney, 8-water feeding part, 9-drainage ditch, 10-overflow pipe, 11-overflow tank, 12-overflow drain pipe, 13-overflow inlet pipe, 14-waste water drain pipe, 15-first air feed pipe, 16-maintenance water seal tank, 17-second air feed pipe, 18-air inlet hole, 19-adjusting hole, 20-air outlet hole, 21-gate valve, 22-throttling pore plate, 23-circulation inlet pipe, 24-water inlet and drain hole, 25-secondary line water seal tank and 26-liquid level meter.

Detailed Description

In order to clearly understand the design concept and the embodiments based on the design concept of the present invention, it is necessary to simply introduce the secondary line 5 of the existing smoke device before describing the embodiments of the present invention. Referring to fig. 1, a secondary line 5 is arranged on both a catalytic unit waste heat boiler 1 and a flue gas desulfurization unit 3 of an oil refinery to cope with a sudden situation (the main line is not shown in the figure) occurring in the main line, the secondary lines 5 on the catalytic unit waste heat boiler 1 and the flue gas desulfurization unit 3 of the oil refinery are directly communicated with a chimney 7, and a flue butterfly valve 6 for controlling whether the secondary line 5 is used is arranged on each of the catalytic unit waste heat boiler, the pressure reduction pore plate and the secondary line of the flue gas desulfurization unit of the oil refinery, but a rubber elastomer in the flue butterfly valve 6 is in a corrosive flue gas environment containing catalyst dust particles at high temperature for a long time, so that the flue butterfly valve 6 is easy to cause the internal leakage phenomenon of flue gas, which causes that part of the flue gas is directly discharged to the chimney; meanwhile, when the waste heat boiler 1 breaks down and needs to be maintained, the air inlet pipeline of the waste heat boiler 1 is also provided with a flue butterfly valve 6 to be opened or closed, and when the waste heat boiler 1 is maintained, the rubber elastomer in the flue butterfly valve 6 on the air inlet pipeline is in a corrosive flue gas environment containing catalyst dust particles due to the fact that the rubber elastomer is at a high temperature for a long time, and the phenomenon of internal leakage of flue gas easily occurs in the flue butterfly valve 6. Because the flue butterfly valve 6 characteristics limit, can't accomplish zero and leak, if continue to change flue butterfly valve 6 or the maintenance is unable to reach the effect of complete sealing.

The utility model is improved aiming at the problem that the flue gas leakage occurs when the auxiliary line 5 is normally closed, as shown in figure 2, the flue gas leakage preventing device of the catalytic device comprises the auxiliary line 5 which is respectively communicated with the waste heat boiler 1, the pressure reduction pore plate 2 and the flue gas desulfurization device 3, a flue butterfly valve 6 can be arranged on the auxiliary line 5, the working pressure of the auxiliary line water seal tank 25 can be reduced by using the flue butterfly valve 6, the reconstruction difficulty of the auxiliary line 5 is reduced, the waste heat boiler 1 and the flue gas desulfurization device 3 are both communicated with the auxiliary line water seal tank 25 through the auxiliary line 5, the air outlet end of the auxiliary line 5 inserted in the auxiliary line water seal tank 25 extends to the lower part in the auxiliary line water seal tank 25, the auxiliary line water seal tank 25 is communicated with a chimney 7 through an exhaust pipe 4, the flue 6 can be arranged on the exhaust pipe 4, the bottom of the auxiliary line water seal tank 25 is respectively communicated with a drainage ditch 9 and a water feeding part 8 through a first, be equipped with overflow pipe 10 on the subline water sealed tank 25, overflow pipe 10 is located blast pipe 4 and locates the horizontal position below, subline water sealed tank 25 communicates overflow tank 11 through overflow pipe 10, the lower extreme of overflow pipe 10 extends to the end lower part in the overflow tank 11, the lower part of overflow tank 11 is equipped with level gauge 26, overflow tank 11 from the top down communicates in proper order has overflow drain pipe 12 and overflow inlet tube 13, overflow tank 11 communicates escape canal 9 through overflow drain pipe 12, overflow tank 11 communicates water-feeding part 8 through overflow inlet tube 13, water-feeding part 8 here is the water-feeding pump in this embodiment. Meanwhile, the waste heat boiler 1 is communicated with the pressure reduction pore plate 2 through an air inlet pipe, the air inlet pipe comprises a first air supply pipe 15, a maintenance water seal tank 16 and a second air supply pipe 17, the first air supply pipe 15 is inserted into the maintenance water seal tank 16, the air outlet end of the first air supply pipe 15 extends to the lower portion of the bottom of the maintenance water seal tank 16, the side wall of the maintenance water seal tank 16 is communicated with the air inlet end of the waste heat boiler 1 through the second air supply pipe 17, and the bottom of the maintenance water seal tank 16 is communicated with the drainage ditch 9 and the water feeding part 8 through a second circulating water pipe respectively.

Referring to fig. 3, an air inlet 18, an adjusting hole 19 and an air outlet 20 are formed in the side wall of the secondary line water-sealed tank 25, a water inlet and drain hole 24 is formed in the bottom of the secondary line water-sealed tank 25, the air inlet 18 and the air outlet 20 are in the same horizontal position and are symmetrically arranged, the adjusting hole 19 is located below the air outlet 20, the secondary line 5 penetrates through the air inlet 18 and penetrates into the secondary line water-sealed tank 25, the air outlet end of the secondary line 5 is located below the adjusting hole 19, the exhaust pipe 4 is communicated with the air outlet 20, and the overflow pipe 10 is communicated with the adjusting hole 19; the air inlet hole 18 and the air outlet hole 20 are positioned at the same horizontal position, the adjusting hole 19 is positioned below the air inlet hole 18, namely the horizontal height of the adjusting hole 19 is lower than that of the air outlet hole 20, and meanwhile, the height of the adjusting hole 19 is the maximum height of circulating water in the secondary line water-sealed tank 25, so that the water inlet of the air outlet pipe 4 is avoided; the first circulating water pipe is communicated with the water inlet and drain hole 24 and comprises a main pipeline, one end of the main pipeline is communicated with the bottom of the secondary line water seal tank 25, the other end of the main pipeline is communicated with a circulating water inlet pipe 23 and a waste water drain pipe 14 which are arranged in parallel, the drain end of the waste water drain pipe 14 is communicated with a drain ditch 9, the waste water drain pipe 14 is provided with a gate valve 21, the water inlet end of the circulating water inlet pipe 23 is communicated with the water supply part 8, the circulating water inlet pipe 23 is provided with a gate valve 21, the water inlet end and the water outlet end of the gate valve 21 of the circulating water inlet pipe 23 are connected in parallel with a branch pipe, and the branch pipe is; the function of the first circulating water pipe is to fill water or drain the subline water-sealed tank 25 according to the service condition of the subline water-sealed tank 25, when water is filled, the gate valve 21 on the waste water drain pipe 14 is closed, the gate valve 21 on the branch is closed, the gate valve 21 on the circulating water inlet pipe 23 is opened, when most of circulating water enters, the gate valve 21 on the circulating water inlet pipe 23 is closed, the gate valve 21 on the branch is opened, the flow rate of the circulating water can be reduced when the circulating water flows through the throttle orifice 22, and the circulating water is matched with the left overflow tank 11 to prevent the water from flooding the exhaust pipe 4; when the water is drained, the gate valve 21 on the branch is closed, the gate valve 21 on the circulating water inlet pipe 23 is closed, the gate valve 21 on the waste water drain pipe 14 is opened, and the circulating water in the secondary line water-sealed tank 25 flows to the drainage ditch 9 through the waste water drain pipe 14, so that the secondary line 5 can be conveniently used.

In the utility model, the working principle and structure of the waste heat boiler 1 (model: B-1501), the secondary line water-sealed tank 25 (model: V-1501B) and the chimney 7 (model: ST-1501) are all known principles and structures, and are not described herein; the flue gas desulfurization device in this embodiment may be any type that matches the waste heat boiler 1, and the working principle and structure of the flue gas desulfurization device are also known principles and structures, and are not described herein again.

When the utility model is used, referring to fig. 4, when the main line of the exhaust-heat boiler 1 and the flue gas desulfurization device 3 normally runs, the secondary line 5 needs to be closed, i.e. the secondary line 5 is not started, the gate valve 21 on the exhaust pipe 4 is closed, the water feeding component 8 injects the circulating water into the secondary line water seal tank 25 through the first circulating water pipe, and the liquid level of the circulating water in the secondary line water-sealed tank 25 is higher than the position of the air outlet end of the secondary line 5 in the secondary line water-sealed tank 25, the pressure intensity in the secondary line water-sealed tank 25 is larger than the pressure intensity in the secondary line 5 through continuous water injection, thereby realizing the water seal of the secondary line 5, because the height of the exhaust hole 20 is above the adjusting hole 19, when the height of the circulating water in the secondary line water-sealed tank 25 reaches the height of the adjusting hole 19, overflowed circulating water flows into the overflow tank 11 along with the overflow pipe 10, so that the circulating water is prevented from overflowing into the exhaust pipe 4 due to excessive water injection of the circulating water. Referring to fig. 2, when exhaust-heat boiler 1 and flue gas desulphurization unit 3's thread goes wrong and needs adopt subline 5, water-feeding part 8 discharges the circulating water from subline water seal tank 25 through waste water drain pipe 14, makes the flue gas can get into subline water seal tank 25 and discharge, injects the circulating water in overflow tank 11, all is equipped with the circulating water in first circulating water pipe and the overflow tank 11 and reaches the effect of water seal, the emergence of leaking appears when avoiding the flue gas to pass through subline water seal tank 25. Referring to fig. 2, when the exhaust-heat boiler 1 is maintained, circulating water is fed into the maintenance water seal tank 16 through the second circulating water pipe by the water feeding part 8, the circulating water passes through the air outlet end of the first air supply pipe 15, and along with the continuous injection of the circulating water, the pressure of the circulating water makes the first air supply pipe 15 unable to supply flue gas, so as to achieve the technical effect of water seal, and thus the flue gas cannot be conveyed to the exhaust-heat boiler 1 through the second air supply pipe 17, so as to avoid leakage; after the maintenance of the waste heat boiler 1 is completed, the circulating water in the maintenance water seal tank 16 is discharged to the drainage ditch 9 through the second circulating water pipe, no circulating water in the maintenance water seal tank 16 carries out water seal on the flue gas, and the flue gas is sent into the waste heat boiler 1 through the second gas sending pipe 17. The utility model discloses reached and to have made flue subline 5 reach zero leakage, made catalytic unit's flue gas all discharge after desulfurization system handles to the environmental protection hidden danger that the long period run of remove device exists.

Claims (7)

1. A flue gas leakage prevention device for a catalytic device comprises a secondary line (5) which is respectively communicated with a waste heat boiler (1), a pressure reduction pore plate (2) and a flue gas desulfurization device (3), and is characterized in that the waste heat boiler (1), the pressure reduction pore plate (2) and the flue gas desulfurization device (3) are communicated with a secondary line water seal tank (25) through the secondary line (5), the air outlet end of the secondary line (5) inserted in the secondary line water seal tank (25) extends to the lower bottom part in the secondary line water seal tank (25), the secondary line water seal tank (25) is communicated with a chimney (7) through an exhaust pipe (4), the bottom of the secondary line water seal tank (25) is respectively communicated with a drainage ditch (9) and a water feeding component (8) through a first circulating water pipe, an overflow pipe (10) is arranged on the secondary line water seal tank (25), the overflow pipe (10) is positioned below the horizontal position of the exhaust pipe (4), and the secondary line water seal tank (25) is communicated with an overflow tank (11) through the overflow pipe, the lower end of the overflow pipe (10) extends to the bottom lower part in the overflow tank (11).

2. A flue gas leakage preventing device for a catalytic unit as defined in claim 1, wherein the sub-line water-sealed tank (25) is provided with an air inlet (18), an adjusting hole (19) and an air outlet (20), the air inlet (18) and the air outlet (20) are located at the same horizontal position, the adjusting hole (19) is located below the air outlet (20), the sub-line (5) is disposed through the air inlet (18), the exhaust pipe (4) is communicated with the air outlet (20), and the overflow pipe (10) is communicated with the adjusting hole (19).

3. A flue gas leakage preventing device for a catalytic device according to claim 1, wherein the first circulating water pipe comprises a main pipeline, one end of the main pipeline is communicated with the bottom of the secondary water-sealed tank (25), the other end of the main pipeline is communicated with a circulating water inlet pipe (23) and a waste water drain pipe (14) which are arranged in parallel, the water drain end of the waste water drain pipe (14) is communicated with the drainage ditch (9), a gate valve (21) is arranged on the waste water drain pipe (14), the water inlet end of the circulating water inlet pipe (23) is communicated with the water feeding component (8), and the circulating water inlet pipe (23) is provided with the gate valve (21).

4. A flue gas leakage preventing device for a catalytic unit according to claim 3, wherein the inlet end and the outlet end of the gate valve (21) of the circulating inlet pipe (23) are connected in parallel with a branch, and the branch is provided with the gate valve (21) and the orifice plate (22) in sequence.

5. A flue gas leakage preventing device for catalytic unit as defined in claim 1, wherein a liquid level meter (26) is provided at the lower part of said overflow tank (11), said overflow tank (11) is connected with an overflow drain pipe (12) and an overflow inlet pipe (13), said overflow tank (11) is connected to a drain (9) through said overflow drain pipe (12), and said overflow tank (11) is connected to a water supply member (8) through said overflow inlet pipe (13).

6. A device against leakage of flue gases for catalytic units, as in claim 1, characterized in that said secondary line (5) is provided with a flue butterfly valve (6).

7. A flue gas leakage preventing device for a catalytic unit according to any one of claims 1 to 6, wherein said exhaust-heat boiler (1) is connected to the pressure-reducing orifice plate (2) through an inlet pipe, said inlet pipe comprising a first gas supply pipe (15), a maintenance water-sealed tank (16) and a second gas supply pipe (17), said first gas supply pipe (15) is inserted into the maintenance water-sealed tank (16) and the outlet end of the first gas supply pipe (15) extends to the lower bottom part of the inside of the maintenance water-sealed tank (16), the side wall of the maintenance water-sealed tank (16) is connected to the inlet end of said exhaust-heat boiler (1) through the second gas supply pipe (17), and the bottom of said maintenance water-sealed tank (16) is connected to the drainage ditch (9) and the water supply part (8) through the second circulating water pipe, respectively.

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