CN210772276U - Zero leakage system of flue butterfly valve - Google Patents
Zero leakage system of flue butterfly valve Download PDFInfo
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- CN210772276U CN210772276U CN201921568550.8U CN201921568550U CN210772276U CN 210772276 U CN210772276 U CN 210772276U CN 201921568550 U CN201921568550 U CN 201921568550U CN 210772276 U CN210772276 U CN 210772276U
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- butterfly valve
- flue
- flue butterfly
- heat exchanger
- boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model discloses a zero leakage system of flue butterfly valve relates to a boiler flue gas sealing technique field, be equipped with the heat exchanger between boiler and the boiler draught fan, former flue butterfly valve, a airtight air system of clean flue butterfly valve and bypass flue butterfly valve sharing, airtight air system includes a draught fan and No. two draught fans, the inlet end and the air intercommunication of a draught fan, the inlet end and the chimney intercommunication of No. two draught fans, the cold wind inlet end that the end of giving vent to anger of a draught fan and No. two draught fans passes through pipeline intercommunication heat exchanger respectively, the cold wind end of giving vent to anger of heat exchanger is through the inlet end intercommunication of pipeline and former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve respectively, and be equipped with the valve of controlling each flue air inlet respectively on each connecting tube of heat exchanger and former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve. The utility model discloses simple structure, convenient to use reduces the station service power consumption rate, has reduced the maintenance cost, has effectively practiced thrift the cost.
Description
Technical Field
The utility model relates to a boiler flue gas seals technical field, especially relates to a zero leakage system of flue butterfly valve.
Background
The flue gas that the boiler produced can only pass through the chimney emission after needing to pass through flue gas desulfurization denitration system, and the flue butterfly valve is flue gas emission's key equipment, is the bridge between boiler system and the flue gas desulfurization denitration system, and its performance directly influences boiler system and desulfurization denitration system's normal operating and safety.
The existing flue gas desulfurization and denitration process generally comprises a main flue communicated with a boiler induced draft fan, flue gas enters from the main flue and enters a desulfurization and denitration system through an original flue butterfly valve for treatment, and the treated clean flue gas is discharged from a clean flue butterfly valve to a chimney. In order to facilitate maintenance or enable the device to continue to work under abnormal conditions, a bypass flue communicated with a boiler induced draft fan is usually arranged, a bypass flue butterfly valve is arranged on the bypass flue, and the bypass flue is directly communicated with an emptying chimney. In order to seal and prevent leakage when each flue butterfly valve is closed, sealing air must be introduced into a gap between the flue butterfly valve and the flue through a sealing air system, so that smoke on two sides of the flue butterfly valve is blocked and sealed. When the unit normally operates, the original flue butterfly valve and the clean flue butterfly valve are in a fully-opened state, the bypass flue butterfly valve is in a fully-closed state, and the bypass flue butterfly valve is sealed through sealing air; when the SOx/NOx control system breaks down, and the unit still need move, bypass flue butterfly valve is in full open mode, and former flue butterfly valve and clean flue butterfly valve are in the state of closing entirely, and it is sealed to former flue butterfly valve and clean flue butterfly valve through sealed wind this moment to guarantee the normal maintenance in the SOx/NOx control system.
The sealing air system in the prior art mainly takes air from the atmosphere, so that the temperature difference deformation and the thermal stress of a flue butterfly valve are reduced, the sealing reliability is improved, in addition, the temperature of the flue butterfly valve is also prevented from being reduced when cold air is adopted, and the corrosion of corrosive media in hot flue gas to the flue butterfly valve is caused, so that the flue butterfly valve is generally heated by an electric heater, the flue butterfly valve is connected with the electric heater to provide sealing air for the flue butterfly valve, the energy consumption for heating the sealing air is large, and the operation cost is high; in addition, the clean flue gas discharged to a chimney is used as sealing air for recycling, although the temperature of the clean flue gas is higher than that of air, the temperature of the clean flue gas is lower than that of the original flue gas, the clean flue gas is condensed to generate mist after the temperature of the flue gas is reduced, and the mist is more corrosive than untreated high-temperature flue gas, so that the problems that equipment is easy to damage, the operation and maintenance amount is increased and the like are caused.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned utility model not enough, provide a zero leakage system of flue butterfly valve, solved the investment height that exists among the prior art, the big problem of power consumption.
In order to realize the purpose of the utility model, the utility model adopts the technical scheme that: a flue butterfly valve zero leakage system comprises a boiler and a boiler induced draft fan connected with the boiler, wherein the boiler induced draft fan is communicated with a desulfurization and denitrification system through a main flue, the desulfurization and denitrification system is communicated with a chimney through a pipeline, an original flue butterfly valve is arranged in the main flue, and a clean flue butterfly valve is arranged in a connecting pipeline of the desulfurization and denitrification system and the chimney; the boiler induced draft fan is also communicated with the chimney through a bypass flue, and a bypass flue butterfly valve is arranged in the bypass flue; the system is characterized in that a heat exchanger is arranged between the boiler and a boiler induced draft fan, the air outlet end of the boiler is connected with the hot air inlet end of the heat exchanger, and the hot air outlet end of the heat exchanger is connected with the air inlet end of the boiler induced draft fan; airtight air system includes draught fan and No. two draught fans, the inlet end and the air intercommunication of draught fan, the inlet end and the chimney intercommunication of No. two draught fans, the cold wind inlet end through pipeline intercommunication heat exchanger respectively of the end of giving vent to anger of draught fan and No. two draught fans, the cold wind end of giving vent to anger of heat exchanger is through the inlet end intercommunication of pipeline and former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve respectively, and is equipped with the valve of controlling former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve air inlet respectively on each connecting tube of heat exchanger and former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve.
Furthermore, the regulating valves for respectively controlling the air outlet volume of the first draught fan and the air outlet volume of the second draught fan are arranged on the connecting pipeline of the first draught fan and the heat exchanger and the connecting pipeline of the second draught fan and the heat exchanger, and the mixing proportion of the flue gas discharged by the chimney and the air is controlled by regulating the air outlet volume of the first draught fan and the air outlet volume of the second draught fan, so that the temperature of the sealing air and the flue gas of the boiler can be controlled.
Furthermore, a temperature measuring instrument is arranged at the cold air outlet end of the heat exchanger and used for measuring the temperature of the mixed gas of the flue gas and the air discharged by the chimney.
Further, the heat exchanger is a tubular heat exchanger.
The utility model has the advantages that: the system adopts the heat exchanger to exchange heat between the mixed gas of air and flue gas discharged by a chimney and the flue gas of a boiler, a heater is not needed to heat sealing air, and energy conservation and consumption reduction are realized; because the flue gas discharged by the chimney has temperature, the temperature is increased more quickly when the flue gas is mixed with air and subjected to heat exchange by the heat exchanger, the working efficiency is improved, and the phenomenon that the temperature of the flue gas of the boiler is reduced too much due to the simple air heat exchange is prevented, so that the flue gas of the boiler is condensed and fogged, and each device in a flue is seriously corroded; the system has the advantages of simple structure, convenient use, reduction of plant power consumption rate, reduction of maintenance cost and effective saving of cost.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: boiler 1, boiler draught fan 2, flue 3, SOx/NOx control system 4, chimney 5, former flue butterfly valve 6, clean flue butterfly valve 7, bypass flue 8, bypass flue butterfly valve 9, heat exchanger 10, draught fan 11, draught fan No. two 12, valve 13, governing valve 14, thermoscope 15.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, a flue butterfly valve zero leakage system comprises a boiler 1 and a boiler induced draft fan 2 connected with the boiler 1, wherein the boiler induced draft fan 2 is communicated with a desulfurization and denitrification system 4 through a main flue 3, the desulfurization and denitrification system 4 is communicated with a chimney 5 through a pipeline, an original flue butterfly valve 6 is arranged in the main flue 3, and a clean flue butterfly valve 7 is arranged in a connecting pipeline between the desulfurization and denitrification system 4 and the chimney 5; the boiler induced draft fan 2 is also communicated with a chimney 5 through a bypass flue 8, and a bypass flue butterfly valve 9 is arranged in the bypass flue 8; the raw flue butterfly valve 6, the clean flue butterfly valve 7 and the bypass flue butterfly valve 9 share a closed air system, a heat exchanger 10 is further arranged between the boiler 1 and the boiler induced draft fan 2, the air outlet end of the boiler 1 is connected with the hot air inlet end of the heat exchanger 10, and the hot air outlet end of the heat exchanger 10 is connected with the air inlet end of the boiler induced draft fan 2; the closed air system comprises a first induced draft fan 11 and a second induced draft fan 12, wherein the air inlet end of the first induced draft fan 11 is communicated with air, the air inlet end of the second induced draft fan 12 is communicated with a chimney 5, the air outlet ends of the first induced draft fan 11 and the second induced draft fan 12 are respectively communicated with the cold air inlet end of the heat exchanger 10 through pipelines, regulating valves 14 for respectively controlling the air outlet amount of the first induced draft fan 11 and the air outlet amount of the second induced draft fan 12 are arranged on a connecting pipeline of the first induced draft fan 11 and the heat exchanger 10 and a connecting pipeline of the second induced draft fan 12 and the heat exchanger 10, and the mixing ratio of the flue gas discharged by the chimney 5 and the air can be controlled by regulating the air outlet amounts of the first induced draft fan 11 and the second induced; a cold air outlet end of the heat exchanger 10 is respectively communicated with the air inlet ends of the original flue butterfly valve 6, the clean flue butterfly valve 7 and the bypass flue butterfly valve 9 through pipelines, and valves 13 for respectively controlling the air inlet of the original flue butterfly valve 6, the air inlet of the clean flue butterfly valve 7 and the air inlet of the bypass flue butterfly valve 9 are arranged on the connecting pipelines of the heat exchanger 10 and the original flue butterfly valve 6, the connecting pipelines of the clean flue butterfly valve 7 and the bypass flue butterfly valve 9; a temperature measuring instrument 15 is arranged at the cold air outlet end of the heat exchanger 10 and used for measuring the temperature of the mixed gas of the flue gas and the air discharged by the chimney 5; the heat exchanger 10 is a tubular heat exchanger 10.
The working principle is as follows: when the unit normally operates, the original flue butterfly valve 6 and the clean flue butterfly valve 7 are in a fully open state, the bypass flue butterfly valve 9 is in a fully closed state, and the bypass flue butterfly valve 9 is sealed by sealing air; when the desulfurization and denitrification system 4 breaks down and the unit still needs to operate, the bypass flue butterfly valve 9 is in a fully open state, the original flue butterfly valve 6 and the clean flue butterfly valve 7 are in a fully closed state, and at the moment, the original flue butterfly valve 6 and the clean flue butterfly valve 7 are sealed through sealing air, so that normal maintenance in the desulfurization and denitrification system 4 is ensured; the opening and closing of the original flue butterfly valve 6, the clean flue butterfly valve 7 and the bypass flue butterfly valve 9 are realized by the opening and closing of a valve 13 on a pipeline connecting the original flue butterfly valve and the clean flue butterfly valve with the heat exchanger 10.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (4)
1. A flue butterfly valve zero leakage system comprises a boiler and a boiler induced draft fan connected with the boiler, wherein the boiler induced draft fan is communicated with a desulfurization and denitrification system through a main flue, the desulfurization and denitrification system is communicated with a chimney through a pipeline, an original flue butterfly valve is arranged in the main flue, and a clean flue butterfly valve is arranged in a connecting pipeline of the desulfurization and denitrification system and the chimney; the boiler induced draft fan is also communicated with the chimney through a bypass flue, and a bypass flue butterfly valve is arranged in the bypass flue; the system is characterized in that a heat exchanger is arranged between the boiler and a boiler induced draft fan, the air outlet end of the boiler is connected with the hot air inlet end of the heat exchanger, and the hot air outlet end of the heat exchanger is connected with the air inlet end of the boiler induced draft fan; airtight air system includes draught fan and No. two draught fans, the inlet end and the air intercommunication of draught fan, the inlet end and the chimney intercommunication of No. two draught fans, the cold wind inlet end through pipeline intercommunication heat exchanger respectively of the end of giving vent to anger of draught fan and No. two draught fans, the cold wind end of giving vent to anger of heat exchanger is through the inlet end intercommunication of pipeline and former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve respectively, and is equipped with the valve of controlling former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve air inlet respectively on each connecting tube of heat exchanger and former flue butterfly valve, clean flue butterfly valve and bypass flue butterfly valve.
2. The flue butterfly valve zero leakage system of claim 1, wherein regulating valves for controlling air outlet volume of the first induced draft fan and the second induced draft fan respectively are arranged on the connecting pipeline of the first induced draft fan and the heat exchanger and the connecting pipeline of the second induced draft fan and the heat exchanger.
3. The flue butterfly valve zero leakage system of claim 1, wherein a temperature measuring instrument is arranged at a cold air outlet end of the heat exchanger.
4. The flue butterfly valve zero leakage system of claim 1, wherein the heat exchanger is a tubular heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921568550.8U CN210772276U (en) | 2019-09-20 | 2019-09-20 | Zero leakage system of flue butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921568550.8U CN210772276U (en) | 2019-09-20 | 2019-09-20 | Zero leakage system of flue butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210772276U true CN210772276U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921568550.8U Active CN210772276U (en) | 2019-09-20 | 2019-09-20 | Zero leakage system of flue butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210772276U (en) |
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2019
- 2019-09-20 CN CN201921568550.8U patent/CN210772276U/en active Active
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