CN208332234U - A kind of hot rinse-system of super critical boiler system - Google Patents
A kind of hot rinse-system of super critical boiler system Download PDFInfo
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- CN208332234U CN208332234U CN201820951239.0U CN201820951239U CN208332234U CN 208332234 U CN208332234 U CN 208332234U CN 201820951239 U CN201820951239 U CN 201820951239U CN 208332234 U CN208332234 U CN 208332234U
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Abstract
The utility model relates to a kind of hot rinse-systems of super critical boiler system, including extraction steam pipe group and conveyance conduit；The entrance of extraction steam pipe group is separately connected this machine auxiliary steam header and as the occasion requires the second high-pressure heater, and outlet is separately connected the second high-pressure heater of the machine oxygen-eliminating device, the first high-pressure heater of the machine and the machine；The entrance of conveyance conduit connects the outlet of low-level (stack-gas) economizer as the occasion requires, outlet connection the machine plate heat exchanger；Extraction steam pipe group and conveyance conduit, which pass through, extracts the running the machine water supply of heat as the occasion requires, by heating using steam extraction as the occasion requires come plate heat exchanger, high-pressure heater and the oxygen-eliminating device to the machine, realizes hot flushing process of the boiler under the state of misfiring.The utility model can realize the heating and hot flushing for water supply before boiler startup, extend the service life of super critical boiler, can be widely applied to power plant for energy conservation environmental technology field.
Description
Technical field
The utility model relates to power plant for energy conservation environmental technology field, in particular to a kind of hot punchings of super critical boiler system
Wash system.
Background technique
Currently, super critical boiler startup stage requires to be heated to the vapor (steam) temperature of separator by hot flushing
190℃.Separator temperature is heated to 190 DEG C and realized generally by following procedure by routine: by auxiliary vapour header to oxygen-eliminating device
Boiler feed temperature is increased to 80 DEG C or so by heating, then by extracting the steam discharge of steam turbine high-pressure cylinder as the occasion requires to No. two high pressures
Feed temperature is further increased to 120 DEG C or so, temperature is further heated to 190 DEG C after ignition of the boiler later by heater.
But ignition of the boiler initial stage feed temperature is lower, boiler duty is insufficient, and the heating surface of superheater and reheater is general
Store-through is in dry combustion method, amount of cooling water deficiency problem, and heating surface rate temperature change is larger, steam temperature is higher.In order to reduce vapor (steam) temperature
Change rate needs to spray desuperheating water, this just easily causes the peeling of oxide skin and then blocks heating surface.Due to initial start stage steam stream
Amount is smaller, cannot promptly take away the oxide skin peeled off, in big flow, oxide skin is in the lesser elbow shape of caliber
At blocking, cause heating surface overtemperature, aggravates the generation of oxide skin；In the raised situation of set grid-connection load, steam is cooling not
Foot further causes heating surface overtemperature even booster, and the oxide skin to fall off may be deposited in Steam Turbine's Main Vaper Valve, adjust and make at valve
At valve bite, the safe and stable operation of unit is threatened.
Therefore, unit starting stage heating surface temperature rise rate, temperature are all higher, and vapor (steam) temperature often deviates when steam turbine red switch
Design value is unfavorable for steam turbine starting；Set grid-connection initial stage feed temperature is relatively low, and it is more that water supply absorbs heat in economizer,
It causes economizer exit flue-gas temperature relatively low, the reaction temperature of denitrating flue gas is not achieved for a long time, denitration spray ammonia, which cannot be put into, to be made
It is exceeded at discharging, so that flue gas denitrification system 3~4 hours generally after grid-connected put into, cause smoke emissioning pollution object exceeded, it is dirty
Contaminate atmospheric environment.
Utility model content
In order to solve the above technical problems, technical solution provided by the utility model are as follows: a kind of heat of super critical boiler system
State rinse-system, water-cooling wall, oxygen-eliminating device, high-pressure heater, low temperature including super critical boiler and in super critical boiler save
Coal device, plate heat exchanger and condenser further include extraction steam pipe group and conveyance conduit；
The second high-pressure heater extraction line, outlet are separately connected the machine first as the occasion requires for the entrance connection of the extraction steam pipe group
The second high-pressure heater of high-pressure heater and the machine；
The entrance of the conveyance conduit connects the outlet of low-level (stack-gas) economizer as the occasion requires, outlet connection the machine plate heat exchanger；
The extraction steam pipe group and conveyance conduit, which pass through, extracts the running the machine water supply of heat as the occasion requires, reaches not
The hot purpose for rinsing super critical boiler in the state of igniting.
Optimally, the extraction steam pipe group is equipped with valve group, to control Steam-water Flow, aperture in extraction steam pipe group, and
The extraction steam pipe group includes the first extraction line and the second extraction line；First extraction line entrance connection is second high as the occasion requires
Press heater extraction line, outlet connection the first high-pressure heater of the machine；Second extraction line entrance connection as the occasion requires second
High-pressure heater extraction line, outlet connection the second high-pressure heater of the machine.
Optimally, first extraction line is equipped with non-return valve and first manual valve, sets on second extraction line
There is electric check valve.
Optimally, the circuit for forming the plate heat exchanger and low-level (stack-gas) economizer is equipped with several second hand-operated valves and boosting
Pump.
After the above hot rinse-system, the utility model has the advantages that (1) before ignition of the boiler, by facing
Machine steam extraction realizes that the bypath system in super critical boiler system was established, the steam of reheater circulates, and slow using Low Temperature Steam
Slow heated, reheater heating surface, it is possible to prevente effectively from the problem of at the initial stage of ignition heating surface temperature rise rate transfinites；(2) ignition of the boiler
Preceding mistake, reheater have boosted, and shorten the increasing temperature and pressure time, and vapor (steam) temperature has also obtained good control, improve steam turbine
Red switch condition, extend the service life of steam turbine；(3) being heated by steam extraction as the occasion requires improves feed temperature into furnace water supply,
Caloric receptivity of the water supply in economizer reduces, so that denitration reaction area flue-gas temperature significantly improves, realizes that investment is de- in advance
Nitre sprays the purpose of ammonia system, avoids not up to standard problem of the environment protection emission index within a very long time after set grid-connection.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the hot rinse-system of super critical boiler system.
Specific embodiment
The following describes the utility model in further detail with reference to the accompanying drawings.
When carrying out hot flushing to super critical boiler system, comprising the following steps:
(1) the closed cycle water in the machine plate heat exchanger is transported in low-level (stack-gas) economizer as the occasion requires and carries out flue gas,
Heat-setting water in the machine plate heat exchanger is transmitted back to again the condensed water after heating is then transported to the machine low pressure and is added to 80 DEG C
In hot device；
(2) water faced in machine auxiliary steam header is transported in the oxygen-eliminating device of the machine using conveyance conduit and is heated, so that step
(1) water supply in inside oxygen-eliminating device is warming up to 140 DEG C, and then 140 DEG C of water supply is transported in the machine high-pressure heater；
(3) a part of steam in the second high-pressure heater as the occasion requires is extracted into the second high-pressure heater of the machine, to this
Water supply in the second high-pressure heater of machine is heated, and temperature is increased to 180 DEG C, is then transported to 180 DEG C of water supply
In the first high-pressure heater of the machine；
(4) a part of steam in the second high-pressure heater as the occasion requires is extracted into the first high-pressure heater of the machine, to this
Water supply in the first high-pressure heater of machine is heated, and temperature is increased to 220 DEG C, is then sent into the water-cooling wall of the machine boiler
In, reach the hot cleaning parameter that misfires of super critical boiler.
In view of in practical situations, the water supply of super critical boiler 10 DEG C of temperature drop in economizer, the temperature drop in water-cooling wall
20 DEG C, so that the vapor (steam) temperature of boiler startup separator is about 190 DEG C, realize the hot flushing in the case of boiler misfires.
In actual steam extraction as the occasion requires operation, it may be transported in the machine due to excessive steam as the occasion requires and cause to coagulate
Vapour device liquid level is high, therefore, increases discharge pipe line before condensate pump outlet is precision processing, controls condenser liquid level, in this way can
Temperature of the water supply in oxygen-eliminating device is improved, and the mixed bed reproduction time can be extended.
Such as Fig. 1, a kind of hot rinse-system of super critical boiler system, including super critical boiler and be located at super critical boiler
Interior water-cooling wall 1, oxygen-eliminating device 2, high-pressure heater, low-level (stack-gas) economizer 3, plate heat exchanger 4 and condenser 5, further includes extraction steam pipe
Group 6 and conveyance conduit 7；The second high-pressure heater extraction line 8, outlet are separately connected this as the occasion requires for the entrance connection of extraction steam pipe group 6
The first high-pressure heater of machine 9 and the second high-pressure heater of the machine 10；The entrance of conveyance conduit 7 connects the 11 of low-level (stack-gas) economizer as the occasion requires
Outlet, the outlet of conveyance conduit 7 connects the machine plate heat exchanger 4；Extraction steam pipe group 6 and conveyance conduit 7 are by extracting in operation
The machine of heat as the occasion requires water supply, achieve the purpose that hot flushing super critical boiler in the state of misfiring.Extraction steam pipe
It is equipped with valve group 601 in group 6, to control Steam-water Flow, aperture in extraction steam pipe group 6, and extraction steam pipe group 6 includes the first pumping
Steam pipe road 61 and the second extraction line 62.
In power plant's setting, general that at least two units are arranged, operating status is operated together including two units and separate unit
Unit operation, to ensure that equipment is in normal condition, in the utility model when it is implemented, operating status is the fortune of unit as the occasion requires
Row, the machine unit are in state to be launched.At this point, the condensed water come out from the condenser 5 of the machine successively passes through condensate pump
501, it is entered in the plate heat exchanger 4 of the machine after precision processing 502 and gland heater 503, from the plate heat exchanger 4 of the machine
In the closed cycle water that comes out enter as the occasion requires in low-level (stack-gas) economizer 11, using the flue gas heat in low-level (stack-gas) economizer 11 as the occasion requires to this
The closed cycle water of machine is heated, and the water supply after heating is transported to heat-setting water in the plate heat exchanger 4 of the machine again；And
Afterwards, the 7th low-pressure heater 12 and the 8th low-pressure heater of the machine are crossed in the water supply come out from the plate heat exchanger of the machine 4
13, into the 6th low-pressure heater 14 of the machine, the condensed water come out from the 6th heater 14 of the machine by the machine the
The oxygen-eliminating device 2 for entering the machine after five low-pressure heaters 15, at this point, being pumped to from some vapor that this machine auxiliary steam header 16 comes
To be heated to the water supply in oxygen-eliminating device 2 in the oxygen-eliminating device 2 of the machine；Then, the water supply warp come out from the oxygen-eliminating device of the machine 2
It crosses after fore pump 17 and feed pump 18 into the machine third high-pressure heater 19, the second high pressure of the machine is successively passed through in then water supply
After heater 11, the first high-pressure heater of the machine 11, feed temperature is heated to 220 DEG C, finally, from the first hyperbaric heating of the machine
The water supply come out in device 11 is sent into the wall-cooling surface 1 of the machine, carries out the hot flushing of boiler, and when the Fe ion in water supply
The hot flushing for stopping boiler when content is every liter of 30 microgram, is ready for the starting work of boiler.
In order in flexible modulation the utility model feedwater flow and opening and closing, be provided with valve group 601, be located at connection as the occasion requires
Valve group 601 in first extraction steam pipe group 61 of the second high-pressure heater extraction line 9 and the first high-pressure heater of the machine 10 is wrapped
Non-return valve 601a and first manual valve 601b are included, being located at connection, the second high-pressure heater extraction line 9 and the machine second are high as the occasion requires
Pressing the valve group 601 on the second extraction line 62 of heater extraction line 11 includes electric check valve 601c.
In order to realize that there is pressure water supply in the plate heat exchanger 4 place circuit of the machine, it is provided with booster 20 in the loop.
After the above hot rinse-system, the utility model has the advantages that (1) before ignition of the boiler, by facing
Machine steam extraction realizes that the bypath system in super critical boiler system was established, the steam of reheater circulates, and slow using Low Temperature Steam
Slow heated, reheater heating surface, it is possible to prevente effectively from the problem of at the initial stage of ignition heating surface temperature rise rate transfinites；(2) ignition of the boiler
Preceding mistake, reheater have boosted, and shorten the increasing temperature and pressure time, and vapor (steam) temperature has also obtained good control, improve steam turbine
Red switch condition, extend the service life of steam turbine；(3) being heated by steam extraction as the occasion requires improves feed temperature into furnace water supply,
The raising of feed temperature is so that caloric receptivity of the water supply in economizer reduces, so that denitration reaction area flue-gas temperature obviously mentions
Height realizes the purpose of the spray ammonia system of investment denitration in advance, and environment protection emission index is within a very long time after avoiding set grid-connection
Problem not up to standard.
Claims (4)
1. a kind of hot rinse-system of super critical boiler system, the water cooling including super critical boiler and in super critical boiler
Wall, oxygen-eliminating device, high-pressure heater, low-level (stack-gas) economizer, plate heat exchanger and condenser, which is characterized in that further include extraction steam pipe group
And conveyance conduit；
The second high-pressure heater extraction line, outlet are separately connected the first high pressure of the machine as the occasion requires for the entrance connection of the extraction steam pipe group
The second high-pressure heater of heater and the machine；
The entrance of the conveyance conduit connects the outlet of low-level (stack-gas) economizer as the occasion requires, outlet connection the machine plate heat exchanger；
The extraction steam pipe group and conveyance conduit, which pass through, extracts the running the machine water supply of heat as the occasion requires, reaches and is misfiring
In the state of it is hot rinse super critical boiler purpose.
2. a kind of hot rinse-system of super critical boiler system according to claim 1, which is characterized in that the steam extraction
Pipe group is equipped with valve group, and to control Steam-water Flow, aperture in extraction steam pipe group, and the extraction steam pipe group includes the first steam extraction
Pipeline and the second extraction line；The second high-pressure heater extraction line, outlet connect as the occasion requires for the first extraction line entrance connection
Connect the first high-pressure heater of the machine；The second extraction line entrance connects the second high-pressure heater extraction line as the occasion requires, outlet
Connect the second high-pressure heater of the machine.
3. a kind of hot rinse-system of super critical boiler system according to claim 2, which is characterized in that described first
Extraction line is equipped with non-return valve and first manual valve, and second extraction line is equipped with electric check valve.
4. a kind of hot rinse-system of super critical boiler system according to claim 3, which is characterized in that described in composition
The circuit of plate heat exchanger and low-level (stack-gas) economizer is equipped with several second hand-operated valves and booster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820951239.0U CN208332234U (en) | 2018-06-20 | 2018-06-20 | A kind of hot rinse-system of super critical boiler system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820951239.0U CN208332234U (en) | 2018-06-20 | 2018-06-20 | A kind of hot rinse-system of super critical boiler system |
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| Publication Number | Publication Date |
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| CN208332234U true CN208332234U (en) | 2019-01-04 |
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| CN201820951239.0U Active CN208332234U (en) | 2018-06-20 | 2018-06-20 | A kind of hot rinse-system of super critical boiler system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716666A (en) * | 2018-06-20 | 2018-10-30 | 华润电力（渤海新区）有限公司 | A kind of hot purging method of super critical boiler system and system |
-
2018
- 2018-06-20 CN CN201820951239.0U patent/CN208332234U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716666A (en) * | 2018-06-20 | 2018-10-30 | 华润电力（渤海新区）有限公司 | A kind of hot purging method of super critical boiler system and system |
| CN108716666B (en) * | 2018-06-20 | 2023-11-10 | 华润电力（渤海新区）有限公司 | Thermal state flushing method and system for supercritical boiler system |
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