CN111306526B - Drainage main pipe system recycling and discharging device of auxiliary system of coal-fired steam drum boiler - Google Patents
Drainage main pipe system recycling and discharging device of auxiliary system of coal-fired steam drum boiler Download PDFInfo
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- CN111306526B CN111306526B CN202010130548.3A CN202010130548A CN111306526B CN 111306526 B CN111306526 B CN 111306526B CN 202010130548 A CN202010130548 A CN 202010130548A CN 111306526 B CN111306526 B CN 111306526B
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- drain
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- 238000004064 recycling Methods 0.000 title claims description 5
- 238000007599 discharging Methods 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000011084 recovery Methods 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims description 75
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000011033 desalting Methods 0.000 claims description 4
- 230000002209 hydrophobic effect Effects 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000004071 soot Substances 0.000 description 54
- 230000000737 periodic effect Effects 0.000 description 6
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 4
- 239000003657 drainage water Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- 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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a drainage mother pipe system recovery and discharge device of an auxiliary system of a coal-fired steam drum boiler, which belongs to the field of thermal energy power engineering in the coal-fired power generation industry, and comprises a mother pipe system drainage system, a drainage recovery system and a drainage discharge system; according to the invention, drainage of auxiliary systems on the side of the coal-fired steam drum boiler after ultra-low emission modification is intensively recovered, and drainage recovery and emission adopt a main pipe structure, so that efficient switching of drainage recovery and emission systems can be realized; the drainage recovery system is additionally provided with a branch which returns to the drainage system, so that the smooth drainage of unqualified water quality of the drainage recovery system can be realized according to the monitored water quality condition of the drainage tank, and the drainage recovery quality is ensured; considering that saturation temperature under hydrophobic pressure is closer to that of the No. six low-pressure heater, according to the principle of energy cascade utilization, each auxiliary system of the boiler is recovered to the No. six low-pressure heater in a hydrophobic mode, compared with the scheme that the water is directly recovered to the deaerator, the problem that the efficiency of the unit is reduced due to the fact that steam supply is heated and the water is drained is avoided.
Description
Technical Field
The invention relates to a drainage main pipe recovery and discharge device of an auxiliary system of a coal-fired steam drum boiler, and belongs to the field of thermal energy power engineering in the coal-fired power generation industry.
Background
In recent years, ultra-low emission reconstruction engineering is comprehensively implemented in coal-fired power plants, and denitration, desulfurization, dust removal systems and other matched equipment are mainly upgraded and reconstructed so that smoke and dust meet ultra-low emission standards. For coal-fired power plants with the MW level of 300MW and below, because the drum configured by the boiler needs continuous and periodic pollution discharge, in the ultra-low emission modification process of the coal-fired unit, the drainage water generated by adding or modifying equipment is often discharged to a periodic pollution discharge expansion vessel and then discharged to a trench, so that the drainage water of a boiler system is not fully recovered, and a large amount of recoverable drainage water is wasted.
After the ultra-low emission of the coal-fired unit is reformed, the directly increased drainage of the auxiliary system of the boiler generally comprises denitration soot blowing drainage, soot blowing drainage of a low-temperature economizer, heat tracing drainage of electric dust removal and the like; after denitration is modified in an ultralow mode, ammonium bisulfate with strong cohesiveness is more easily generated due to the fact that the ammonia escape amount in the flue gas is increased, so that the problem of ammonium bisulfate blockage frequently occurs in the air preheater, the soot blowing frequency of the air preheater after the denitration is modified in an ultralow mode is obviously increased, and the soot blowing water-repellent capacity of the air preheater is increased.
For the air heater matched with ultralow emission reconstruction of the drum boiler of the coal-fired unit, the continuous operation time is long and the drainage is large, so that the air heater is one of the important focus directions of drainage recovery of an auxiliary system of the boiler. In order to solve or alleviate the problem of the blockage of the ammonium bisulfate type air preheater, the main scheme is that a heater is additionally arranged at the outlet of a fan so as to improve the comprehensive temperature of the cold end of the outlet of the air preheater and the metal wall temperature in the air preheater, so that the ammonium bisulfate condensation area in the air preheater moves upwards to the hot section of the air preheater, and the soot blowing operation of the hot section of the air preheater is facilitated. At present, the drainage of a heater generally has two recovery schemes, (1) drainage, a drainage tank, a drainage pump and a deaerator, and the main problems are complex system, corrosion of the drainage pump, failure of the water level of the drainage tank and the like; (2) The main problem of the drainage condenser is that the drainage energy of the heater after the drainage condenser is taken away by circulating water, so that energy loss is caused, and the thermal economy of a unit is reduced; when the steam trap is installed, the steam-water separation function failure of the steam trap is easy to occur, the steam trap capacity is reduced, and even a steam trap system cannot operate; the furnace side drainage is conveyed to the condenser at the machine side through a pipeline, and pipeline water hammer and vibration are easy to generate due to thermal stress deviation generated by longer pipeline drainage, so that the safe operation of a drainage system is influenced; in addition, the drainage system of the condenser is not tightly sealed and leaks like a certain device, and the vacuum operation of the condenser can be greatly influenced, so that the safe and economic operation of a unit is influenced. A series of problems exist in the two schemes, and drainage generated by drainage of a coal-fired steam drum boiler heater is often discharged to a trench through a periodic blowdown flash tank. For scheme (1), the problem of unit operation safety is solved through further optimal design, and for scheme (2), the steam is not recovered for a long time through the condenser in unit operation in most cases.
The drainage of the soot blowing system of the coal-fired drum boiler body is also mostly discharged to a periodic blowdown flash tank at present. After the ultra-low emission is modified, no comprehensive drainage recovery and emission device for the auxiliary system of the coal-fired steam drum boiler exists, and the problems of drainage heat recovery and quality waste of the auxiliary system of the boiler are generally solved. The drainage comprehensive recovery and discharge device of the auxiliary system of the coal-fired steam drum boiler can effectively recover drainage of the auxiliary system of the boiler, and improves the running economy of the boiler.
Disclosure of Invention
Aiming at the problem that drainage of an auxiliary system of the coal-fired steam drum boiler is not fully recovered after ultra-low emission modification, the invention provides a drainage main pipe system recovery and emission device of the auxiliary system of the coal-fired steam drum boiler.
The invention solves the problems by adopting the following technical scheme: the drainage mother pipe system recovery and discharge device of the auxiliary system of the coal-fired steam drum boiler is characterized by comprising a mother pipe drainage system, a drainage recovery system and a drainage discharge system;
The main pipe drainage system comprises a denitration soot blowing drainage pipe, a low-temperature economizer soot blowing drainage pipe, an air preheater soot blowing drainage pipe, an electric dust collector ash bucket heat tracing drainage pipe, a boiler body soot blowing drainage pipe and a heater drainage pipe, wherein the denitration soot blowing drainage pipe, the low-temperature economizer soot blowing drainage pipe, the air preheater soot blowing drainage pipe, the electric dust collector ash bucket heat tracing drainage pipe, the boiler body soot blowing drainage pipe and the heater drainage pipe are respectively provided with a denitration soot blowing drainage electric valve, a low-temperature economizer soot blowing drainage electric valve, an air preheater soot blowing drainage electric valve, an electric dust collector ash bucket heat tracing drainage electric valve, a boiler body soot blowing drainage electric valve and a heater drainage electric valve, and the denitration soot blowing drainage pipe, the low-temperature economizer soot blowing drainage pipe, the air preheater soot blowing drainage pipe, the electric dust collector ash bucket heat tracing drainage pipe, the boiler body soot blowing drainage pipe and the boiler drainage pipe are arranged in parallel and are all connected to the main drainage pipe;
The drainage recovery system comprises a drainage recovery electric main valve, a drainage tank, a first drainage pump, a second drainage pump and a sixth low-pressure heater, wherein a drainage inlet of the drainage tank is communicated with a drainage main pipe, the drainage recovery electric main valve is arranged at the drainage inlet of the drainage tank, a water outlet of the drainage tank is communicated with water inlets of the first drainage pump and the second drainage pump, a drainage tank manual valve is arranged at the water outlet of the drainage tank, the first drainage pump and the second drainage pump are arranged in parallel, a first drainage pump manual valve and a first drainage pump check valve are respectively arranged at the water inlet and the water outlet of the first drainage pump, a second drainage pump manual valve and a second drainage pump check valve are respectively arranged at the water inlet and the water outlet of the second drainage pump, the water outlet of the first drainage pump and the second drainage pump are respectively divided into two branches to be respectively communicated to the drainage system and the sixth low-pressure heater, and a first manual valve, an electric regulating valve, a second manual valve and a check valve are respectively arranged at the water inlet of the sixth low-pressure heater;
The drainage system comprises a drainage electric main valve and a regular drainage expansion vessel, the regular drainage expansion vessel is communicated with the drainage main pipe, the drainage electric main valve is arranged on a pipeline between the drainage main pipe and the regular drainage expansion vessel, the regular drainage expansion vessel is also connected with a water outlet branch of a first drainage pump and a water outlet branch of a second drainage pump, and a drainage manual valve is arranged on the water outlet branch of the first drainage pump and the water outlet branch of the second drainage pump.
Further, the drain tank is connected with a boiler desalting water pipeline, and an emergency cooling electric valve of the drain tank is arranged on the desalting water pipeline.
Further, the back pipeline of the drain tank manual valve is connected with a drain tank emergency water drain pipeline and a drain tank sampling pipeline, and the drain tank emergency water drain manual valve and the drain tank sampling manual valve are respectively installed on the drain tank emergency water drain pipeline and the drain tank sampling pipeline and are used for monitoring drain water quality.
Further, the first drainage pump and the second drainage pump are provided with frequency converters, the drainage tank is provided with a liquid level meter, and the drainage tank is combined with an electric regulating valve and used for controlling the liquid level of the drainage pump and regulating drainage flow.
Compared with the prior art, the invention has the following advantages and effects: (1) The drainage of each auxiliary system on the side of the coal-fired drum boiler after ultra-low emission modification is intensively recovered, and the drainage recovery and emission adopt a main pipe structure, so that the efficient switching of the drainage recovery and emission systems can be realized; (2) The drainage recovery system is additionally provided with a branch which returns to the drainage system, so that the smooth drainage of unqualified water quality of the drainage recovery system can be realized according to the monitored water quality condition of the drainage tank, and the drainage recovery quality is ensured; (3) Considering that saturation temperature under hydrophobic pressure is closer to that of the No. six low-pressure heater, according to the principle of energy cascade utilization, each auxiliary system of the boiler is recovered to the No. six low-pressure heater in a hydrophobic mode, compared with the scheme that the water is directly recovered to the deaerator, the problem that the efficiency of the unit is reduced due to the fact that steam supply is heated and the water is drained is avoided.
Drawings
Fig. 1 is a schematic view of the overall structure of an apparatus according to an embodiment of the present invention.
In the figure: the boiler comprises a denitration soot blowing drainage pipeline 1, a low-temperature economizer soot blowing drainage pipeline 2, an air preheater soot blowing drainage pipeline 3, an electric dust-removing ash bucket heat tracing drainage pipeline 4, a boiler body soot blowing drainage pipeline 5, a heater drainage pipeline 6, a denitration soot blowing drainage electric valve 7, a low-temperature economizer soot blowing drainage electric valve 8, an air preheater soot blowing drainage electric valve 9, an electric dust-removing ash bucket heat tracing drainage electric valve 10, a boiler body soot blowing drainage electric valve 11, a heater drainage electric valve 12, a drainage main pipe 13, a drainage recovery electric main valve 14, a drainage discharge electric main valve 15, a drainage tank emergency cooling electric valve 16, a drainage tank 17, a drainage tank manual valve 18, a drainage tank emergency drainage manual valve 19, a drainage tank sampling manual valve 20, a drainage pump manual valve 21, a drainage pump 22, a drainage pump check valve 23, a drainage pump manual valve 24, a drainage pump 25, a drainage pump 26, a drainage manual valve 27, a periodic expansion tank 28, a manual valve 29, an electric control valve 30, a drainage pump 32 and a low-pressure check valve 31.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
The boiler of the 330MW ultra-supercritical coal-fired unit of a certain power plant is a subcritical pressure once intermediate reheat control circulating drum furnace, and the model is SG-1120/17.50-M732. The boiler adopts a swinging type burner for temperature adjustment, four corners arrangement, tangential combustion, a positive pressure direct blowing powder making system, a single hearth, open-air arrangement of a U-shaped type, solid slag discharge, an all-steel frame structure and balanced ventilation.
The unit completes ultra-low emission reconstruction in 2018, and after reconstruction, the multi-channel drainage of the auxiliary system of the boiler is discharged to a periodic blowdown flash tank of the boiler and then to a trench; the drain of the heater is recycled to the condenser through the pipeline, and because sealing is not tight and leakage occurs in a certain device in the pipeline of the condenser is removed in the earlier stage, the problem of vacuum reduction of the condenser is caused, the drain recycling pipeline is not put into operation temporarily, so that the drain of the heater cannot be timely and smoothly recycled, and a large amount of drain of the heater is discharged to a regular blowdown flash tank, so that the problems of recoverable drain heat and quality waste are caused.
In order to solve the problems, a set of drainage mother pipe system recovery and discharge device of an auxiliary system of a coal-fired steam drum boiler is designed and installed, and the device comprises a mother pipe system drainage system, a drainage recovery system and a drainage discharge system, as shown in fig. 1.
The main pipe drainage system comprises a denitration soot blowing drainage pipe 1, a low-temperature economizer soot blowing drainage pipe 2, an air preheater soot blowing drainage pipe 3, an electric dust-collecting ash bucket heat tracing drainage pipe 4, a boiler body soot blowing drainage pipe 5 and a heater drainage pipe 6, wherein the denitration soot blowing drainage pipe 1, the low-temperature economizer soot blowing drainage pipe 2, the air preheater soot blowing drainage pipe 3, the electric dust-collecting ash bucket heat tracing drainage pipe 4, the boiler body soot blowing drainage pipe 5 and the heater drainage pipe 6 are respectively provided with a denitration soot blowing electric valve 7, a low-temperature economizer soot blowing electric valve 8, an air preheater soot blowing drainage electric valve 9, an electric dust-collecting ash bucket heat tracing drainage electric valve 10, a boiler body soot blowing electric valve 11 and a heater drainage electric valve 12, and the denitration soot blowing drainage pipe 1, the low-temperature economizer soot blowing drainage pipe 2, the air preheater drainage pipe 3, the electric dust bucket heat tracing drainage pipe 4, the boiler body drainage pipe 5 and the heater drainage pipe 6 are arranged in parallel and are all connected to a drainage pipe 13.
The operating pressure and temperature of the primary auxiliary systems of the boiler, which are involved in the hydrophobic recovery, meet the following requirements: 1. when the denitration system blows ash, the opening of a soot blowing steam regulating valve is regulated, the pressure of an SCR soot blowing main pipe (the pressure behind a soot blowing pneumatic valve of the denitration system) is maintained to be 1.0MPa, the steam temperature is set to be 350 ℃, the soot blower automatically exits when the soot blowing pressure of the soot blower is smaller than 0.9 MPa or larger than 1.5MPa, and the soot blowing water delivery temperature of the denitration system must be more than 200 ℃; 2. the low-temperature economizer adopts an air preheater steam source for blowing ash, the pressure of a soot blowing steam regulating valve is set to be 1.0MPa, the steam temperature is set to be 300-350 ℃, and the soot blowing water delivery temperature of the low-temperature economizer must be more than 180 ℃; 3. an auxiliary header is arranged below 30% load of the air preheater for supplying steam, the steam pressure is 0.8-1.0MPa, and the temperature is 250-350 ℃; when the load is above 30%, the main body supplies steam, and the pressure of the soot blowing steam regulating valve is set to be 1.5MPa and the temperature is set to be 330 ℃; 4. when the boiler body is used for blowing ash and the air preheater and the low-temperature economizer are used for blowing ash by adopting a boiler body steam source, the pressure of a steam regulating valve of the body for blowing ash is set to be 1.7MPa, the pressure of a steam regulating valve of the air preheater is set to be 1.5MPa, the temperature is 330 ℃, long blowing steam pressure and short blowing steam pressure are automatically withdrawn when the pressure of the long blowing steam and the short blowing steam pressure are less than 1.05MPa, and the low-temperature economizer is automatically withdrawn when the pressure of blowing ash is more than 1.2 MPa; 5. the rated steam supply pressure of the air heater is 0.6MPa, the rated steam supply temperature is 240 ℃, the maximum steam supply pressure is 1.8MPa, and the maximum steam supply temperature is 280 ℃;
The drainage recovery system comprises a drainage recovery electric main valve 14, a drainage tank 17, a first drainage pump 22, a second drainage pump 25 and a sixth low-pressure heater 33, wherein a drainage inlet of the drainage tank 17 is communicated with a drainage main pipe 13, the drainage recovery electric main valve 14 is arranged at the drainage inlet of the drainage tank 17, a water outlet of the drainage tank 17 is communicated with water inlets of the first drainage pump 22 and the second drainage pump 25, a drainage tank manual valve 18 is arranged at a water outlet of the drainage tank 17, the first drainage pump 22 and the second drainage pump 25 are arranged in parallel, a first drainage pump manual valve 21 and a first drainage pump check valve 23 are respectively arranged at a water inlet and a water outlet of the first drainage pump 22, a second drainage pump manual valve 24 and a second drainage pump check valve 26 are respectively arranged at a water inlet and a water outlet of the second drainage pump 25, a water outlet of the first drainage pump 22 and the second drainage pump 25 are respectively communicated to a drainage system and the sixth low-pressure heater 33, and a first electric control valve 30, a second control valve 31 and a second control valve 32 are respectively arranged at a water inlet of the sixth low-pressure heater 33;
The drainage system comprises a drainage electric main valve 15 and a regular drainage expansion tank 28, the regular drainage expansion tank 28 is communicated with the drainage main pipe 13, the drainage electric main valve 15 is arranged on a pipeline between the drainage main pipe 13 and the regular drainage expansion tank 28, the regular drainage expansion tank 28 is also connected with a water outlet branch of a first drainage pump 22 and a second drainage pump 25, and a drainage manual valve 27 is arranged on the water outlet branch of the first drainage pump 22 and the second drainage pump 25.
The drain tank 17 is connected with a boiler demineralized water pipeline, and a drain tank emergency cooling electric valve 16 is arranged on the demineralized water pipeline. The back pipeline of the drain tank manual valve 18 is connected with a drain tank emergency drain pipeline and a drain tank sampling pipeline, and a drain tank emergency drain manual valve 19 and a drain tank sampling manual valve 20 are respectively installed on the drain tank emergency drain pipeline and the drain tank sampling pipeline and are used for monitoring drain water quality.
In order to prevent cavitation of the drain pump, the drain tank 17 needs to have a certain height pressure head, and in order to make the drain smooth, it is necessary to ensure that the elevation of the water inlet pipe orifice of the drain tank 17 is lower than that of the drain main pipe 13 of the auxiliary system of the boiler, and the drain tank 17 and the drain pump are arranged at zero meter. The drain pump is used for one, a set of electric regulating valve group is arranged on the drain main pipe behind the drain pump, and the liquid level in the drain tank 17 is regulated and controlled within a set safety range by regulating the flow of the drain water entering the deaerator. A check valve is arranged before the drain water enters the deaerator to prevent the drain water from flowing back.
The first and second drain pumps 22 and 25 are provided with frequency converters, the drain tank 17 is provided with a liquid level meter, and the electric regulating valve 30 is combined for controlling the liquid level of the drain pump and regulating the drain flow. The drain tank 17 is provided with temperature and pressure monitoring and measuring equipment, and the top of the drain tank 17 is provided with a safety valve and a steam exhaust valve.
The main equipment parameters of the drainage main pipe recovery and discharge device of the auxiliary system of the boiler are as follows: the flow of the drain pump is 20 Nm/h, the lift is 120m, the working temperature is less than 150 ℃, and the working pressure is less than 0.5MPa; an ultrasonic flowmeter, a flow rate of 20 Nm/h, an operating temperature of less than 150 ℃, an operating pressure of less than 0.5MPa and a DN65; drain tank 17, volume 2 m.
After the device is put into operation, the device is stable in operation, and the drainage of each auxiliary system of the boiler can be effectively recovered, so that the running economy of the unit is improved.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (4)
1. The drainage mother pipe system recovery and discharge device of the auxiliary system of the coal-fired steam drum boiler is characterized by comprising a mother pipe drainage system, a drainage recovery system and a drainage discharge system;
The main pipe drainage system comprises a denitration soot-blowing drainage pipe (1), a low-temperature economizer soot-blowing drainage pipe (2), an air preheater soot-blowing drainage pipe (3), an electric dust-collecting ash bucket heat-tracing drainage pipe (4), a boiler body soot-blowing drainage pipe (5) and a heater drainage pipe (6), wherein the denitration soot-blowing drainage pipe (1), the low-temperature economizer soot-blowing drainage pipe (2), the air preheater soot-blowing drainage pipe (3), the electric dust-collecting ash bucket heat-tracing drainage pipe (4), the boiler body soot-blowing drainage pipe (5) and the heater drainage pipe (6) are respectively provided with a denitration soot-blowing drainage electric valve (7), a low-temperature economizer soot-blowing electric valve (8), an air preheater soot-blowing drainage electric valve (9), an electric dust-collecting ash bucket heat-tracing drainage electric valve (10), a boiler body soot-blowing drainage electric valve (11) and a heater drainage electric valve (12), and the denitration drainage pipe (1), the low-temperature economizer soot-blowing drainage pipe (2), the air preheater drainage pipe (3), the electric dust bucket heat-collecting ash bucket (4), the boiler body drainage pipe (5) and the heater drainage pipe (6) are connected in parallel to the main pipe (13);
The drainage recovery system comprises a drainage recovery electric main valve (14), a drainage tank (17), a first drainage pump (22), a second drainage pump (25) and a sixth low-pressure heater (33), the drain inlet of the drain tank (17) is communicated with the drain main pipe (13), and the drainage recovery electric main valve (14) is arranged at the drainage inlet of the drainage tank (17), the water outlet of the drain tank (17) is communicated with the water inlets of the first drain pump (22) and the second drain pump (25), and a drain tank manual valve (18) is arranged at the water outlet of the drain tank (17), the first drainage pump (22) and the second drainage pump (25) are arranged in parallel, a first drain pump manual valve (21) and a first drain pump check valve (23) are respectively arranged at the water inlet and the water outlet of the first drain pump (22), a manual valve (24) of the second drainage pump and a check valve (26) of the second drainage pump are respectively arranged at the water inlet and the water outlet of the second drainage pump (25), the water outlets of the first drainage pump (22) and the second drainage pump (25) are divided into two branches which are respectively communicated with a drainage discharge system and a sixth low-pressure heater (33), a first manual valve (29), an electric regulating valve (30), a second manual valve (31) and a check valve (32) are arranged at the water inlet of the sixth low-pressure heater (33);
The drainage system comprises a drainage electric main valve (15) and a regular drainage expansion vessel (28), wherein the regular drainage expansion vessel (28) is communicated with a drainage main pipe (13), the drainage electric main valve (15) is arranged on a pipeline between the drainage main pipe (13) and the regular drainage expansion vessel (28), the regular drainage expansion vessel (28) is also connected with a water outlet branch of a first drainage pump (22) and a second drainage pump (25), and a drainage manual valve (27) is arranged on a water outlet branch of the first drainage pump (22) and the second drainage pump (25);
the drain tank (17) is connected with a boiler desalting water pipeline, and a rear pipeline of the drain tank manual valve (18) is connected with a drain tank emergency water drain pipeline and a drain tank sampling pipeline.
2. The drainage mother pipe system recycling and discharging device of the auxiliary system of the coal-fired steam drum boiler according to claim 1, wherein a drainage tank emergency cooling electric valve (16) is installed on the desalting water pipeline.
3. The drainage mother pipe system recycling and discharging device of the auxiliary system of the coal-fired steam drum boiler according to claim 1, wherein a drainage tank emergency drainage manual valve (19) and a drainage tank sampling manual valve (20) are respectively installed on the drainage tank emergency drainage pipeline and the drainage tank sampling pipeline.
4. The drainage mother pipe system recovery and discharge device of the auxiliary system of the coal-fired steam drum boiler according to claim 1, wherein the first drainage pump (22) and the second drainage pump (25) are provided with frequency converters, and the drainage tank (17) is provided with a liquid level meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130548.3A CN111306526B (en) | 2020-02-28 | 2020-02-28 | Drainage main pipe system recycling and discharging device of auxiliary system of coal-fired steam drum boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130548.3A CN111306526B (en) | 2020-02-28 | 2020-02-28 | Drainage main pipe system recycling and discharging device of auxiliary system of coal-fired steam drum boiler |
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| Publication Number | Publication Date |
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| CN111306526A CN111306526A (en) | 2020-06-19 |
| CN111306526B true CN111306526B (en) | 2024-07-02 |
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| CN105180142B (en) * | 2015-09-02 | 2017-05-31 | 华北电力科学研究院有限责任公司 | A kind of soot blowing heating coil hydrophobic and steam recovery system and method |
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