CN224135887U - A sealing air system for preventing high-temperature flue gas from eroding valves - Google Patents
A sealing air system for preventing high-temperature flue gas from eroding valvesInfo
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- CN224135887U CN224135887U CN202520812915.6U CN202520812915U CN224135887U CN 224135887 U CN224135887 U CN 224135887U CN 202520812915 U CN202520812915 U CN 202520812915U CN 224135887 U CN224135887 U CN 224135887U
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- valve
- communicated
- sealing air
- flue gas
- temperature flue
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Abstract
本实用新型公开了一种用于避免高温烟气冲刷阀门的密封风系统，包括炉膛、输粉管道、输粉阀门、密封气管道和密封气阀门，所述输粉管道的输出端与炉膛连通，所述输粉管道上设有输粉阀门，所述密封气管道的输出端与输粉阀门和炉膛之间的输粉管道连通，所述密封气管道的输入端与气源连通，所述密封气管道上设有密封气阀门，与现有技术相比，能够采用常规阀门即可满足要求，使用维护成本低，降低系统阻力。
This utility model discloses a sealing air system for preventing high-temperature flue gas from eroding valves, including a furnace, a pulverized coal conveying pipe, a pulverized coal conveying valve, a sealing gas pipe, and a sealing gas valve. The output end of the pulverized coal conveying pipe is connected to the furnace, and a pulverized coal conveying valve is provided on the pulverized coal conveying pipe. The output end of the sealing gas pipe is connected to the pulverized coal conveying pipe between the pulverized coal conveying valve and the furnace. The input end of the sealing gas pipe is connected to a gas source, and a sealing gas valve is provided on the sealing gas pipe. Compared with the prior art, conventional valves can be used to meet the requirements, resulting in low operating and maintenance costs and reduced system resistance.
Description
Technical Field
The utility model relates to the technical field of pneumatic conveying and in-furnace desulfurization, in particular to the technical field of a sealing air system for avoiding flushing a valve by high-temperature flue gas.
Background
Aiming at the boiler with positive pressure in the hearth, a block valve at the joint of a powder conveying pipeline of a desulfurization system in the boiler and the hearth needs to bear high-temperature flue gas scouring from about 850-1100 ℃ in the hearth when the system is stopped, and the valve needs to adopt a special high-temperature resistant valve corresponding to the high-temperature flue gas scouring or lightens direct scouring of the high-temperature flue gas through complex system pipeline arrangement.
The valve has the defects of high requirements on valve materials, high price, easy damage and high use and maintenance cost because a special high-temperature resistant valve is adopted.
The valve is protected by reducing direct flushing of flue gas through pipeline arrangement, so that the required space range is large enough, the pipeline arrangement is complex, the system resistance is increased, and the installation space is generally not provided on site.
Disclosure of Invention
The utility model aims to solve the problems in the prior art, and provides a sealing air system for avoiding flushing a valve by high-temperature flue gas, which can meet the requirements by adopting a conventional valve, has low use and maintenance cost and reduces the system resistance.
In order to achieve the above purpose, the utility model provides a sealing air system for preventing high-temperature flue gas from flushing a valve, which comprises a hearth, a powder conveying pipeline, a powder conveying valve, a sealing air pipeline and a sealing air valve, wherein the output end of the powder conveying pipeline is communicated with the hearth, the powder conveying pipeline is provided with the powder conveying valve, the output end of the sealing air pipeline is communicated with the powder conveying pipeline between the powder conveying valve and the hearth, the input end of the sealing air pipeline is communicated with an air source, and the sealing air pipeline is provided with the sealing air valve.
Preferably, the powder conveying pipeline is communicated with the desulfurizing agent feeding device, the desulfurizing agent feeding device comprises a limestone powder bin, a screw feeder, a fan and a venturi ejector, the input end of the screw feeder is communicated with the limestone powder bin, the output end of the screw feeder is communicated with the material input end of the venturi ejector, and the output end of the fan is communicated with the air inlet end of the venturi ejector.
Preferably, the limestone powder bin is internally provided with a heating mechanism, the heating mechanism comprises a shunt pipe, a plurality of radiating pipes and a collecting pipe, the shunt pipe is communicated with the collecting pipe through the radiating pipes, the radiating pipes are coiled pipes, and the shunt pipe and the collecting pipe are respectively provided with a heat medium inlet and a heat medium outlet which extend out of the limestone powder bin.
Preferably, a feed inlet is arranged on one side of the limestone powder bin, and a dust removal filter communicated with the limestone powder bin is arranged at the upper end of the limestone powder bin.
Preferably, the dust removal filter comprises a shell, a filter core, a connecting sleeve, an air outlet and a tightening cover, wherein the connecting sleeve is arranged on the inner side of the rear end of the shell, the filter core is arranged in the connecting sleeve, the tightening cover tightly tightening the front end of the filter core is arranged at the front end of the shell, and the air outlet is arranged in the middle of the shell in the connecting sleeve.
Preferably, the air outlet is provided with an air exhaust valve, the air outlet at the front end of the air exhaust valve is communicated with a sealing air pipeline at the upper end of the sealing air valve through a back blowing pipe, and the back blowing pipe is provided with a back blowing valve.
Preferably, the front end of the shell is provided with a connecting port in threaded connection with a jacking cover, and a sealing plug jacked on the front end of the filter core is arranged in the jacking cover.
The utility model has the beneficial effects that the high-temperature flue gas in the hearth is isolated from the valve by introducing the sealing wind, and compared with the prior art, the high-temperature flue gas in the hearth can meet the requirements by adopting the conventional valve, the use and maintenance cost is low, and the system resistance is reduced.
The features and advantages of the present utility model will be described in detail by way of example with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a seal-air system for avoiding high temperature flue gas flushing of a valve in accordance with the present utility model;
fig. 2 is a partial construction view of the dust filter.
In the figure, a 1-hearth, a 2-powder conveying pipeline, a 3-powder conveying valve, a 4-sealing gas pipeline, a 5-sealing gas valve, a 6-desulfurizing agent feeding device, a 7-back blowing pipe, an 8-back blowing valve, a 61-limestone powder bin, a 62-screw feeder, a 63-fan, a 64-Venturi ejector, a 65-heating mechanism, a 66-feeding port, a 67-dust removal filter, a 651-shunt pipe, a 652-radiating pipe, a 653-collecting pipe, a 654-heat medium inlet, a 655-heat medium outlet, a 671-shell, a 672-filter element, a 673-connecting sleeve, a 674-gas outlet, a 675-tightening cover, a 676-gas discharging valve, a 677-connecting port and a 678-sealing plug are arranged.
Detailed Description
Referring to fig. 1 and 2, the sealing air system for preventing high-temperature flue gas from flushing a valve comprises a hearth 1, a powder conveying pipeline 2, a powder conveying valve 3, a sealing air pipeline 4 and a sealing air valve 5, wherein the output end of the powder conveying pipeline 2 is communicated with the hearth 1, the powder conveying valve 3 is arranged on the powder conveying pipeline 2, the output end of the sealing air pipeline 4 is communicated with the powder conveying pipeline 2 between the powder conveying valve 3 and the hearth 1, the input end of the sealing air pipeline 4 is communicated with an air source, and the sealing air valve 5 is arranged on the sealing air pipeline 4.
The powder conveying pipeline 2 is communicated with the desulfurizing agent feeding device 6, the desulfurizing agent feeding device 6 comprises a limestone powder bin 61, a screw feeder 62, a fan 63 and a venturi injector 64, the input end of the screw feeder 62 is communicated with the limestone powder bin 61, the output end of the screw feeder 62 is communicated with the material input end of the venturi injector 64, the output end of the fan 63 is communicated with the air inlet end of the venturi injector 64, feeding stability and controllability are achieved through the screw feeder 62, high-speed injection is generated to form sucking and injection conveying energy through cooperation of the fan 63 and the venturi injector 64, limestone powder is injected into the hearth 1 through the powder conveying pipeline 2, and reliability and continuity of limestone powder adding are improved.
The limestone powder bin 61 is internally provided with a heating mechanism 65, the heating mechanism 65 comprises a shunt pipe 651, a plurality of radiating pipes 652 and a collecting pipe 653, the shunt pipe 651 is communicated with the collecting pipe 653 through the radiating pipes 652, the radiating pipes 652 are coiled pipes, a heat medium inlet 654 and a heat medium outlet 655 which extend out of the limestone powder bin 61 are respectively arranged on the shunt pipe 651 and the collecting pipe 653, the limestone powder is easy to agglomerate when moisture content is about 6%, compressed air is used as an air source to blow the agglomerated limestone material into a circulating fluidized bed boiler, the flue gas desulfurization effect is affected, and the heating mechanism 65 is used for drying the moist limestone powder, so that the problem of the flue gas desulfurization effect is avoided.
One side of the limestone powder bin 61 is provided with a feed inlet 66, and the upper end of the limestone powder bin 61 is provided with a dust removal filter 67 communicated with the limestone powder bin 61.
The dust removing filter 67 comprises a housing 671, a filter core 672, a connecting sleeve 673, an air outlet 674 and a tightening cap 675, wherein the connecting sleeve 673 is arranged on the inner side of the rear end of the housing 671, the filter core 672 is arranged in the connecting sleeve 673, the tightening cap 675 tightly tightening the front end of the filter core 672 is arranged at the front end of the housing 671, the air outlet 674 is arranged in the middle of the housing 671 in the connecting sleeve 673, and when the filter core 672 is replaced and maintained, the filter core 672 can be taken out only by unscrewing the tightening cap 675, so that the dust removing filter is convenient to disassemble and assemble.
The exhaust valve 676 is arranged on the air outlet 674, the air outlet 674 at the front end of the exhaust valve 676 is communicated with the sealing air pipeline 4 at the upper end of the sealing air valve 5 through the blowback pipe 7, the blowback pipe 7 is provided with the blowback valve 8, and the filter element 672 is cleaned in a blowback manner through the blowback pipe 7, so that the filtering efficiency of the filter element 672 is improved, and the manual workload is reduced.
The front end of the shell 671 is provided with a connecting port 677 in threaded connection with a jacking cover 675, the jacking cover 675 is internally provided with a sealing plug 678 jacked on the front end of the filter element 672, the assembly and the disassembly of the jacking cover 675 are convenient, and the fixing reliability is good.
The working process of the utility model comprises the following steps:
In the working process of the sealing air system for preventing the high-temperature flue gas from flushing the valve, when the sealing air valve 5 and the powder conveying valve 3 are in signal interlocking and the in-furnace desulfurization system stops running, the closing signal of the powder conveying valve 3 is transmitted to the sealing air valve 5, the sealing air valve 5 is opened, the powder conveying pipeline 2 at the output end of the powder conveying valve 3 is continuously provided with an air source with the pressure higher than the back pressure of a hearth, the powder conveying valve 3 is isolated from the high-temperature flue gas in the hearth, so that the powder conveying valve 3 is protected from being flushed by the high-temperature flue gas, when the in-furnace desulfurization system starts to run, the opening signal of the powder conveying valve 3 is transmitted to the sealing air valve 5, the sealing air valve 5 is closed, the two sets of systems are ensured to run alternately, the two systems are not interfered with each other, and the powder conveying valve 3 is always in an isolated state with the high-temperature flue gas.
When the filter element 672 is back blown, feeding into the limestone powder bin 61 is stopped, the sealing air valve 5 and the exhaust valve 676 are closed, the powder conveying valve 3 and the fan 63 are in an open state, the back blowing valve 8 is opened, and an air source enters the filter element 672 through the sealing air pipeline 4 at the input end of the sealing air valve 5, the back blowing pipe 7 and the air outlet 674 at the input end of the exhaust valve 676, then passes through the filter element 672 and enters the shell 671, so that back blowing of the filter element 672 is realized.
The powder conveying valve 3 can meet the requirements by adopting a conventional valve, and has low use and maintenance cost.
And complicated pipeline design is not needed for reducing direct flushing of the valve by the flue gas, so that the installation space and the pipeline cost are saved, and the system resistance is reduced.
The above embodiments are illustrative of the present utility model, and not limiting, and any simple modifications of the present utility model fall within the scope of the present utility model.
Claims (7)
1. A sealing air system for avoiding high-temperature flue gas flushing of a valve is characterized by comprising a hearth (1), a powder conveying pipeline (2), a powder conveying valve (3), a sealing air pipeline (4) and a sealing air valve (5), wherein the output end of the powder conveying pipeline (2) is communicated with the hearth (1), the powder conveying valve (3) is arranged on the powder conveying pipeline (2), the output end of the sealing air pipeline (4) is communicated with the powder conveying pipeline (2) between the powder conveying valve (3) and the hearth (1), the input end of the sealing air pipeline (4) is communicated with an air source, and the sealing air valve (5) is arranged on the sealing air pipeline (4).
2. A sealing wind system for avoiding flushing valves with high temperature flue gas according to claim 1, wherein the powder conveying pipeline (2) is communicated with a desulfurizing agent feeding device (6), the desulfurizing agent feeding device (6) comprises a limestone powder bin (61), a screw feeder (62), a fan (63) and a venturi injector (64), the input end of the screw feeder (62) is communicated with the limestone powder bin (61), the output end of the screw feeder (62) is communicated with the material input end of the venturi injector (64), and the output end of the fan (63) is communicated with the air inlet end of the venturi injector (64).
3. A sealing air system for avoiding flushing a valve by high-temperature flue gas according to claim 2, wherein a heating mechanism (65) is arranged in the limestone powder bin (61), the heating mechanism (65) comprises a shunt tube (651), a plurality of radiating tubes (652) and a collecting tube (653), the shunt tube (651) is communicated with the collecting tube (653) through the radiating tubes (652), the radiating tubes (652) are coiled tubes, and a heat medium inlet (654) and a heat medium outlet (655) which extend out of the limestone powder bin (61) are respectively arranged on the shunt tube (651) and the collecting tube (653).
4. A sealing air system for avoiding flushing a valve by high-temperature flue gas according to claim 2, wherein a feed inlet (66) is arranged on one side of the limestone powder bin (61), and a dust removal filter (67) communicated with the limestone powder bin (61) is arranged at the upper end of the limestone powder bin.
5. A seal air system for avoiding flushing a valve with high temperature flue gas as defined in claim 4, wherein the dust filter (67) comprises a housing (671), a filter core (672), a connecting sleeve (673), an air outlet (674) and a tightening cover (675), the inner side of the rear end of the housing (671) is provided with the connecting sleeve (673), the connecting sleeve (673) is internally provided with the filter core (672), the front end of the housing (671) is provided with the tightening cover (675) tightly tightened on the front end of the filter core (672), and the middle position of the housing (671) in the connecting sleeve (673) is provided with the air outlet (674).
6. A sealing air system for avoiding flushing a valve by high-temperature flue gas according to claim 5, wherein the air outlet (674) is provided with an air outlet valve (676), the air outlet (674) at the front end of the air outlet valve (676) is communicated with a sealing air pipeline (4) at the upper end of the sealing air valve (5) through a back-blowing pipe (7), and the back-blowing pipe (7) is provided with a back-blowing valve (8).
7. A seal air system for avoiding flushing valves with high temperature flue gas as defined in claim 5, wherein the front end of the housing (671) is provided with a connection port (677) in threaded connection with a tightening cap (675), and a seal plug (678) tightened against the front end of the filter element (672) is provided in the tightening cap (675).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520812915.6U CN224135887U (en) | 2025-04-27 | 2025-04-27 | A sealing air system for preventing high-temperature flue gas from eroding valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520812915.6U CN224135887U (en) | 2025-04-27 | 2025-04-27 | A sealing air system for preventing high-temperature flue gas from eroding valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN224135887U true CN224135887U (en) | 2026-04-17 |
Family
ID=99432823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202520812915.6U Active CN224135887U (en) | 2025-04-27 | 2025-04-27 | A sealing air system for preventing high-temperature flue gas from eroding valves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN224135887U (en) |
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2025
- 2025-04-27 CN CN202520812915.6U patent/CN224135887U/en active Active
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