CN107420139A - A kind of low pressure (LP) cylinder cooling steam device and operation method - Google Patents
A kind of low pressure (LP) cylinder cooling steam device and operation method Download PDFInfo
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- CN107420139A CN107420139A CN201710618415.9A CN201710618415A CN107420139A CN 107420139 A CN107420139 A CN 107420139A CN 201710618415 A CN201710618415 A CN 201710618415A CN 107420139 A CN107420139 A CN 107420139A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
Abstract
The invention discloses a kind of low pressure (LP) cylinder cooling steam device and operation method, device to include：Mesolow cylinder communicating pipe, turbine low pressure cylinder, decompressor, Desuperheating device；Mesolow cylinder communicating pipe sets communicating pipe to bypass to be used as cooling steam pipeline；Decompressor, Desuperheating device are installed, and the outlet of decompressor and Desuperheating device is respectively provided with pressure-measuring device, temperature measuring set on cooling steam pipeline.The present invention, according to the cooling parameter needed for turbine low pressure cylinder, can to adjust pressure, temperature, humidity and the flow of cooling steam well, ensure that turbine low pressure cylinder obtains good cooling；So as to solve the low pressure (LP) cylinder of steam turbine extraction condensing back pressure system cooling problem, the application of " steam turbine extraction condensing back pressure system " is expanded.
Description
Technical field
The invention belongs to cogeneration of heat and power field, particularly a kind of low pressure (LP) cylinder cooling steam device and operation method.
Background technology
At present, China's policy gradually payes attention to the popularization of new energy, reduces the ratio of fired power generating unit.For thermal power plant,
The exhaust steam of steam turbine directly discharges typically by air cooling or water-cooling pattern, and this has resulted in huge cold end loss.
Such as the capacity usage ratio of the subcritical pure condensate units of 300MW is about 38%, wherein cold end loss accounts for 45%, using extraction for heat supply
The capacity usage ratio of unit is promoted to 60% afterwards, but the condensation low temperature exhaust heat for still having 20% is discharged, this partial heat by
It is low in grade and be difficult to directly utilize.Simultaneously as power network is consumption new energy electric power, coal group of motors thermoelectricity flexibility is wanted
Continuous reinforcement is asked, coal group of motors need to realize Ultra-low load operation, could meet the peak regulation demand of power network, and this gives coal-fired thermal power unit
Bring great challenge.
At present, the extraction condensing back pressure structure of steam turbine, it is made without more exchanging rotor, you can realize that low pressure (LP) cylinder does not put into operation, should
Technology both can farthest increase external heating load, can realize that unit underload generates electricity with high benefit again.It is meanwhile if right
Cooling steam is first cooled down again, enters back into low pressure (LP) cylinder, then can preferably cool down low pressure (LP) cylinder.But there is presently no preferable
Technology can realize cooling steam is first cooled down again.
The content of the invention
The cooling parameter according to needed for turbine low pressure cylinder of the present invention, bypassed, and connected by setting up communicating pipe
Valve, decompressor, Desuperheating device and steam dehumidifying device are set in pipe bypass, so adjust the pressure of cooling steam, temperature,
Humidity and flow, ensure that turbine low pressure cylinder obtains good cooling.
In order to solve the above problems, the present invention proposes a kind of low pressure (LP) cylinder cooling steam device and operation method.
The technical solution adopted in the present invention is：
A kind of low pressure (LP) cylinder cooling steam device, including mesolow cylinder communicating pipe, heating extraction steam pipe, turbine low pressure cylinder, company
Siphunculus bypass, No.1 valve, No. two valves, decompressor, Desuperheating device and gate valve, after the mesolow cylinder communicating pipe and vapour
Turbine low pressure (LP) cylinder connects and No. two valves is provided with mesolow cylinder communicating pipe, and before No. two valves, mesolow cylinder connects
Siphunculus is bypassed with communicating pipe, heating extraction steam pipe is connected, and No.1 valve, communicating pipe bypass and No. two valves are provided with heating extraction steam pipe
Door is in parallel and is connected with the cooling steam import of turbine low pressure cylinder, and decompressor, desuperheat are sequentially connected in communicating pipe bypass
Device and gate valve.Cooling parameter according to needed for turbine low pressure cylinder, bypassed by setting up communicating pipe, and bypassed in communicating pipe
Upper setting gate valve, decompressor, Desuperheating device, and then pressure, temperature and the flow of cooling steam are adjusted, ensure steam turbine low-pressure
Cylinder obtains good cooling, so as to solve the low pressure (LP) cylinder of steam turbine extraction condensing back pressure system cooling problem；Simultaneously by controlling No.1
Valve, No. two valves, and then the steam discharge of Steam Turbine Through IP Admission is controlled, the work of cooling device is controlled, it is adaptable.
Further, the communicating pipe bypass is additionally provided with pressure-measuring device and temperature measuring set, and pressure-measuring device is located at
Between decompressor and Desuperheating device, temperature measuring set is between Desuperheating device and gate valve.Pressure-measuring device and temperature survey
Instrument monitors the pressure value and temperature value of cooling steam respectively, and then draws pressure value and temperature value and steam turbine low-pressure according to monitoring
Pressure value and temperature value needed for cylinder are compared, it is determined whether cooling steam are depressurized and desuperheat.
Preferably, bypass the communicating pipe and be additionally provided with No.1 bypass, No. three valves, No. four valves and No. five valves, three
Number valve, No. four valves and communicating pipe bypass connect, and No. five valves connect with No.1 bypass, No. three valves be located at decompressor it
Before, No. four valves are between decompressor and pressure-measuring device, No.1 bypass and No. three valves, decompressor, No. four valves
Parallel connection, the point in parallel of No.1 bypass is respectively before No. three valves and No. four between valve and pressure-measuring device.Pass through setting
No.1 bypass, No. three valves, No. four valves, No. five valves, cooling steam can be controlled to enter or do not enter decompressor, and then
Control cooling steam decompression or do not depressurize, do not depressurized in the pressure meet demand of cooling steam, cooling steam by No.1 by
Road is without by decompressor, reducing the passage time of cooling steam, improving efficiency；No. three valves, No. four valves then ensure can
Decompressor is adjusted and safeguarded at any time.
Preferably, the communicating pipe bypass is additionally provided with No. two bypasses, No. six valves, No. seven valves, No. eight valves,
No. six valves, No. seven valves and communicating pipe bypass connect, and No. eight valves and No. two bypasses connect, and No. six valves are located at Desuperheating device
Before, No. four valves are between Desuperheating device and temperature measuring set, No. two bypasses and No. six valves, Desuperheating device, No. seven valves
Door is in parallel, and the points in parallel of No. two bypasses is respectively at No. six between valve and pressure-measuring device and No. seven valves and temperature measuring set
Between.By setting No. two bypasses, No. six valves, No. seven valves, No. eight valves, cooling steam can be controlled to enter or do not enter
Desuperheating device, and then control cooling steam cooling or do not cool, do not cool in the temperature meet demand of cooling steam, cooling is steamed
Vapour is by No. two bypasses without by Desuperheating device, reducing the passage time of cooling steam, improving efficiency；No. six valves, No. seven
Valve then ensures Desuperheating device can be adjusted and be safeguarded at any time.
Preferably, the communicating pipe bypass is additionally provided with steam dehumidifying device, and steam dehumidifying device is located at temperature measuring set
Between gate valve.Dehumidification operation is carried out to cooling steam by steam dehumidifying device, the mass dryness fraction of cooling steam is improved, so as to protect
The blade safety of turbine low pressure cylinder is demonstrate,proved.
A kind of operation method of low pressure (LP) cylinder cooling steam device, comprises the following steps：
Step 1：When cooling steam device does not put into operation, open No.1 valve, No. two valves and close No. three valves,
No. five valves, gate valves, the steam discharge of Steam Turbine Through IP Admission are partly into turbine low pressure cylinder acting and generated electricity, and another part is by heating
Extraction steam pipe exports heat supply；When cooling steam device puts into operation, No. two valves are closed, open No.1 valve, Steam Turbine Through IP Admission
Steam discharge by heating extraction steam pipe export heat supply；
Step 2：After cooling steam device in step 1 puts into operation, when cooling steam needs decompression, No. three valves are opened
Door, No. four valves, gate valves are opened, close No. five valves, the steam discharge of Steam Turbine Through IP Admission draws a tributary as cooling steam elder generation
Into decompressor, decompressor is adjusted, cooling steam exports through No. four valves；When cooling steam need not depressurize, close
No. three valves, No. four valves, open No. five valves, and cooling steam is bypassed through No.1 and exported；
Step 3：When cooling steam needs desuperheat, No. six valves are opened, open No. seven valves, close No. eight valves, it is cold
But steam enters back into Desuperheating device, adjusts Desuperheating device, and the cooling steam after desuperheat is dehumidified into steam dehumidifying device, most
After enter back into turbine low pressure cylinder；When cooling steam does not need desuperheat, No. six valves, No. seven valves are closed, open No. eight valves
Door, cooling steam are dehumidified through No. two bypass outputs into steam dehumidifying device, finally enter back into turbine low pressure cylinder.
Further, in the step 2, the pressure value according to needed for turbine low pressure cylinder, to adjust decompressor and three
Number valve so that the numerical value that pressure-measuring device measures is equal to the pressure value needed for turbine low pressure cylinder.Due to gas pressure with
Temperature has relation, therefore, to assure that cooling steam maintains to enter turbine low pressure cylinder under a certain pressure, prevents to steam turbine low-pressure
The cylinder inner structure of cylinder cause damage the reduction for causing turbine low pressure cylinder service life situation occur.
Preferably, in the step 3, Desuperheating device is adjusted, it is cold that the numerical value for measuring temperature measuring set is more than or equal to this
But the saturation temperature value under steam pressure.Ensure that the temperature of cooling steam on steam condensation temperature, prevents cooling steam from coagulating
Knot, so as to ensure the safety of turbine low pressure cylinder.
Preferably, by adjusting No. six valves or No. eight valves in the step 3, regulation enters the cold of turbine low pressure cylinder
But the flow of steam, the flow of cooling steam is made equal to the flow value needed for turbine low pressure cylinder.Flow is excessive, then takes steamer
The steam discharge of machine intermediate pressure cylinder enters the flow of heating extraction steam pipe, reduces output heat supply；Flow is too small, and cooling steam can not play cooling
The effect of turbine low pressure cylinder.
The present invention compared with the existing technology has advantages below and effect：
1st, the present invention can realize first is cooled down again to the cooling steam for entering turbine low pressure cylinder.
2nd, reasonable in design, simple in construction, dependable performance of the invention, can be according to the pressure and temperature of cooling steam, effectively
Cooling steam is first cooled down again.
3rd, the present invention has carried out dehumidification treatments to cooling steam, improves the mass dryness fraction of steam, ensure that turbine low pressure cylinder
The safety of blade.
4th, cooling steam of the present invention after cooling down again, its temperature is lower, can make it that turbine low pressure cylinder is more preferable
Cooled down, expand the application of " steam turbine extraction condensing back pressure system ".
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the workflow diagram of the present invention.
Label declaration：
Turbine low pressure cylinder 11；Decompressor 12；Pressure-measuring device 13；Desuperheating device 14；
Temperature measuring set 15；Steam dehumidifying device 16；No.1 valve 21；No. two valves 22；
No. three valves 23；No. four valves 24；No. five valves 25；No. six valves 26；
No. seven valves 27；No. eight valves 28；Gate valve 29；Mesolow cylinder communicating pipe 31；
Heating extraction steam pipe 32；Communicating pipe bypass 33；No.1 bypass 34；No. two bypasses 35.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Embodiment 1：As shown in figure 1, a kind of low pressure (LP) cylinder cooling steam device, including mesolow cylinder communicating pipe 31, steam turbine
Low pressure (LP) cylinder 11, decompressor 12, Desuperheating device 14, heating extraction steam pipe 32, gate valve 29, No.1 valve 21 and No. two valves 22, in
Low pressure (LP) cylinder communicating pipe 31 is connected with turbine low pressure cylinder 11, and No. two valves 22 are installed on mesolow cylinder communicating pipe 31；Heating
Extraction steam pipe 32 is connected with mesolow cylinder communicating pipe 31 and tie point is before No. two valves 22, is installed on heating extraction steam pipe 32
No.1 valve 21；It is provided with communicating pipe bypass 33 mesolow cylinder communicating pipe 31, bypasses 33 initiating terminals communicating pipe and connect with mesolow cylinder
Siphunculus connects, and communicating pipe bypasses 33 tail ends and is connected with turbine low pressure cylinder 11, and communicating pipe bypasses 33 initiating terminals and mesolow
The tie point of cylinder communicating pipe installed successively from front to back before No. two valves 22, in communicating pipe bypass 33 decompressor 12,
Desuperheating device 14 and gate valve 29；Gate valve 29, No.1 valve 21 and No. two valves 22 are regulating valves, No. two valves 22, communicating pipes
Bypass 33, the three of heating extraction steam pipe 32 are in parallel relationship.
In use, open and adjust the aperture of 21, No. two valves 22 of No.1 valve, a steam discharge part for Steam Turbine Through IP Admission
Do work and generate electricity into turbine low pressure cylinder 11, another part exports heat supply by heating extraction steam pipe 32；Now closing gate valve 29, cooling
Vapour system does not put into operation；No. two valves 22 are closed, open No.1 valve 21, the steam discharge of Steam Turbine Through IP Admission is substantially all
Heat supply is exported by heating extraction steam pipe 32, now cooling steam system needs to put into operation, opens gate valve 29, Steam Turbine Through IP Admission
One tributary of steam discharge extraction is introduced into decompressor 12 as cooling steam and depressurized, subsequently into the desuperheat of Desuperheating device 14, realization pair
Cooling steam is first cooled down again, and finally, the cooling steam after desuperheat enters turbine low pressure cylinder 11.
Embodiment 2：
The present embodiment is substantially the same manner as Example 1, and distinctive points are：In embodiment 2 in communicating pipe bypass 33 from front to back
It is sequentially connected decompressor 12, pressure-measuring device 13, Desuperheating device 14, temperature measuring set 15, steam dehumidifying device 16 and gate valve
29。
Embodiment 3：
The present embodiment is substantially the same manner as Example 2, and distinctive points are：In embodiment 3 in communicating pipe bypass 33 from front to back
Be sequentially connected No.1 bypass 34, No. three valves 23, decompressor 12,13, No. four valves 24 of pressure-measuring device, Desuperheating device 14,
Temperature measuring set 15, steam dehumidifying device 16 and gate valve 29, No.1 bypass 34 and 12, No. four No. three valves 23, decompressor valves
Door 24 bypasses 33 initiating terminals into parallel relationship, the tie point one of No.1 bypass 34 and communicating pipe bypass 33 positioned at communicating pipe, separately
One between No. four valves 24 and Desuperheating device 14, No. five valves 25 are connected in No.1 bypass 34.No. three valves 23, four
Valve 24 and No. five valves 25 are regulating valve.
In use, opening and adjusting the aperture of No. three valves 23, No. four valves 24, gate valve 29 are opened, closes No. five valves
25, the steam discharge of Steam Turbine Through IP Admission draws a tributary and is introduced into decompressor 12 as cooling steam, according to needed for cooling steam
Pressure value, to adjust decompressor 12 so that the numerical value meet demand that pressure-measuring device 13 measures；When cooling steam need not
During decompression, 23, No. four valves 24 of No. three valves are closed, open No. five valves 25, cooling steam is through the output of No.1 bypass 34.
Embodiment 4：
The present embodiment is substantially the same manner as Example 3, and distinctive points are：In embodiment 4 in communicating pipe bypass 33 from front to back
Be sequentially connected No.1 bypass 34, No. three valves 23,12, No. four valves 24 of decompressor, the bypass of pressure-measuring device 13, two 35,
No. six valves 26,14, No. seven valves 27 of Desuperheating device, temperature measuring set 15, steam dehumidifying device 16 and gate valve 29, No. two bypasses
35 and 14, No. seven No. six valves 26, Desuperheating device valves 27 into parallel relationship, the companies of No. two bypasses 35 and communicating pipe bypass 33
Contact one is between No. four valves 24 and pressure-measuring device 13, and another is positioned at No. seven valves 27 and temperature measuring set 15
Between, connect No. eight valves 28 in No. two bypasses 35.26, No. seven valves 27 of No. six valves and No. eight valves 28 are regulating valve.
In use, opening and adjusting the aperture of No. six valves 26, No. seven valves 27 are opened, close No. eight valves 28, cooling
Steam enters back into Desuperheating device 14, adjusts Desuperheating device 14 so that the numerical value that temperature measuring set 15 measures is this cooling steam pressure
Saturation temperature value under power, the cooling steam after desuperheat enter turbine low pressure cylinder 11；When cooling steam does not need desuperheat, close
26, No. seven valves 27 of No. six valves are closed, open No. eight valves 28, cooling steam enters steam dehumidifying through No. two outputs of bypass 35 and filled
16 are put, then enters back into turbine low pressure cylinder 11.
Embodiment 5：
A kind of operation method of low pressure (LP) cylinder cooling steam device, comprises the following steps：
Step 1：When cooling steam device does not put into operation, open No.1 valve, No. two valves and close No. three valves,
No. five valves, gate valves, the steam discharge of Steam Turbine Through IP Admission are partly into turbine low pressure cylinder acting and generated electricity, and another part is by heating
Extraction steam pipe exports heat supply；When cooling steam device puts into operation, No. two valves are closed, open No.1 valve, Steam Turbine Through IP Admission
Steam discharge by heating extraction steam pipe export heat supply；
Step 2：After cooling steam device in step 1 puts into operation, when cooling steam needs decompression, No. three valves are opened
Door, No. four valves, gate valves are opened, close No. five valves, the steam discharge of Steam Turbine Through IP Admission draws a tributary as cooling steam elder generation
Into decompressor, decompressor is adjusted, cooling steam exports through No. four valves；When cooling steam need not depressurize, close
No. three valves, No. four valves, open No. five valves, and cooling steam is bypassed through No.1 and exported；
Step 3：When cooling steam needs desuperheat, No. six valves are opened, open No. seven valves, close No. eight valves, it is cold
But steam enters back into Desuperheating device, adjusts Desuperheating device, and the cooling steam after desuperheat is dehumidified into steam dehumidifying device, most
After enter back into turbine low pressure cylinder；When cooling steam does not need desuperheat, No. six valves, No. seven valves are closed, open No. eight valves
Door, cooling steam are dehumidified through No. two bypass outputs into steam dehumidifying device, finally enter back into turbine low pressure cylinder.
Embodiment 6：
The present embodiment is substantially the same manner as Example 5, and distinctive points are：Described in embodiment 6 in step 2, work as cooling steam
When needing decompression, the pressure value according to needed for turbine low pressure cylinder, to adjust decompressor and No. three valves so that pressure measxurement
The numerical value that instrument measures is equal to the pressure value needed for turbine low pressure cylinder.
Embodiment 7：
The present embodiment is substantially the same manner as Example 6, and distinctive points are：Described in embodiment 7 in step 3, work as cooling steam
When needing desuperheat, Desuperheating device is adjusted, the numerical value for measuring temperature measuring set is equal to the saturation temperature under this cooling steam pressure
Value.
Embodiment 8：
The present embodiment is substantially the same manner as Example 6, and distinctive points are：Described in embodiment 8 in step 3, work as cooling steam
When needing desuperheat, Desuperheating device is adjusted, the numerical value for measuring temperature measuring set is more than the saturation temperature under this cooling steam pressure
Value.
Embodiment 9：
The present embodiment is substantially the same manner as Example 7, and distinctive points are：By adjusting No. six in step 3 described in embodiment 9
Valve or No. eight valves, regulation make the flow of cooling steam be equal to steamer into the flow of the cooling steam of turbine low pressure cylinder
Flow value needed for machine low pressure (LP) cylinder.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (9)
1. a kind of low pressure (LP) cylinder cooling steam device, it is characterised in that including mesolow cylinder communicating pipe, heating extraction steam pipe, steam turbine
Low pressure (LP) cylinder, communicating pipe bypass, No.1 valve, No. two valves, decompressor, Desuperheating device and gate valve, the mesolow cylinder connection
It is connected after pipe with turbine low pressure cylinder and No. two valves is provided with mesolow cylinder communicating pipe, before No. two valves,
Mesolow cylinder communicating pipe is bypassed with communicating pipe, heating extraction steam pipe is connected, and No.1 valve is provided with heating extraction steam pipe, by communicating pipe
Road is connected with No. two valve in parallel and with the cooling steam import of turbine low pressure cylinder, and decompression is sequentially connected in communicating pipe bypass
Device, Desuperheating device and gate valve.
2. low pressure (LP) cylinder cooling steam device according to claim 1, it is characterised in that the communicating pipe bypass is additionally provided with
Pressure-measuring device and temperature measuring set, between decompressor and Desuperheating device, temperature measuring set is located to be subtracted pressure-measuring device
Between warm device and gate valve.
3. low pressure (LP) cylinder cooling steam device according to claim 2, it is characterised in that the communicating pipe bypass is additionally provided with
No.1 bypass, No. three valves, No. four valves and No. five valves, No. three valves, No. four valves and communicating pipe bypass connect, No. five valves
Door connects with No.1 bypass, and No. three valves be located at before decompressor, No. four valves be located at decompressor and pressure-measuring device it
Between, No.1 bypass and No. three valves, decompressor, No. four valve in parallel, the point in parallel of No.1 bypass respectively No. three valves it
It is preceding and No. four between valve and pressure-measuring device.
4. low pressure (LP) cylinder cooling steam device according to claim 2, it is characterised in that the communicating pipe bypass is also set
No. two bypasses, No. six valves, No. seven valves, No. eight valves are equipped with, No. six valves, No. seven valves and communicating pipe bypass connect, and eight
Number valve and No. two bypasses connect, and No. six valves are located at before Desuperheating device, and No. four valves are located at Desuperheating device and temperature survey
Between instrument, No. two bypasses and No. six valves, Desuperheating device, No. seven valve in parallel, the point in parallel of No. two bypasses is respectively in No. six valves
Between door and pressure-measuring device and No. seven between valve and temperature measuring set.
5. low pressure (LP) cylinder cooling steam device according to claim 2, it is characterised in that the communicating pipe bypass is additionally provided with
Steam dehumidifying device, steam dehumidifying device is between temperature measuring set and gate valve.
6. a kind of operation method of low pressure (LP) cylinder cooling steam device, it is characterised in that any described based on claim 1 to 5
Low pressure (LP) cylinder cooling steam device, comprises the following steps：
Step 1：When cooling steam device does not put into operation, open No.1 valve, No. two valves and close No. three valves, No. five
Valve, gate valve, the steam discharge of Steam Turbine Through IP Admission are partly into turbine low pressure cylinder acting and generated electricity, and another part is drawn gas by heating
Pipe exports heat supply；When cooling steam device puts into operation, No. two valves are closed, open No.1 valve, the row of Steam Turbine Through IP Admission
Vapour exports heat supply by heating extraction steam pipe；
Step 2：After cooling steam device in step 1 puts into operation, when cooling steam needs decompression, No. three valves are opened,
No. four valves, gate valves are opened, close No. five valves, the steam discharge of Steam Turbine Through IP Admission is drawn a tributary and is introduced into as cooling steam
Decompressor, adjusts decompressor, and cooling steam exports through No. four valves；When cooling steam need not depressurize, No. three are closed
Valve, No. four valves, open No. five valves, and cooling steam is bypassed through No.1 and exported；
Step 3：When cooling steam needs desuperheat, No. six valves are opened, open No. seven valves, close No. eight valves, cooling is steamed
Vapour enters back into Desuperheating device, adjusts Desuperheating device, and the cooling steam after desuperheat is dehumidified into steam dehumidifying device, again finally
Into turbine low pressure cylinder；When cooling steam does not need desuperheat, No. six valves, No. seven valves are closed, open No. eight valves, it is cold
But steam is dehumidified through No. two bypass outputs into steam dehumidifying device, finally enters back into turbine low pressure cylinder.
7. the operation method of low pressure (LP) cylinder cooling steam device according to claim 6, it is characterised in that in the step 2,
Pressure value according to needed for turbine low pressure cylinder, to adjust decompressor and No. three valves so that the number that pressure-measuring device measures
Value is equal to the pressure value needed for turbine low pressure cylinder.
8. the operation method of low pressure (LP) cylinder cooling steam device according to claim 7, it is characterised in that in the step 3,
Desuperheating device is adjusted, the saturation temperature value that the numerical value for measuring temperature measuring set is more than or equal under this cooling steam pressure.
9. the operation method of low pressure (LP) cylinder cooling steam device according to claim 8, it is characterised in that in the step 3
By adjusting No. six valves or No. eight valves, regulation makes cooling steam into the flow of the cooling steam of turbine low pressure cylinder
Flow is equal to the flow value needed for turbine low pressure cylinder.
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| CN206267899U (en) * | 2016-11-22 | 2017-06-20 | 华电能源股份有限公司富拉尔基发电厂 | A kind of three-exhauster 200MW turbine low pressure cylinders cooling steam pipe-line system |
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| CN108506057A (en) * | 2018-03-01 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of co-generation unit and adjusting method for cutting off low pressure (LP) cylinder into vapour |
| CN108343480B (en) * | 2018-03-01 | 2023-05-09 | 华电电力科学研究院有限公司 | Condensing back-pumping heat supply system based on double steam extraction of two units and adjusting method |
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