CN110500148A - A kind of high back pressure heat supply of large turbine-generator set and monitoring method and system - Google Patents
A kind of high back pressure heat supply of large turbine-generator set and monitoring method and system Download PDFInfo
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- CN110500148A CN110500148A CN201910782957.9A CN201910782957A CN110500148A CN 110500148 A CN110500148 A CN 110500148A CN 201910782957 A CN201910782957 A CN 201910782957A CN 110500148 A CN110500148 A CN 110500148A
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- heat exchanger
- valve
- measuring device
- high back
- back pressure
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Classifications
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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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/003—Arrangements for measuring or testing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
Abstract
The invention belongs to high back pressure heat supply monitoring and control technologies, more particularly to the high back pressure heat supply and monitoring method and system of a kind of large turbine-generator set, system includes cross over pipe butterfly valve, vacuum pump, high back pressure heat exchanger, heat user heat exchanger, subsidiary water tank, variable frequency pump, condensate pump, heat user heat exchanger, monitoring system, high back pressure heat exchanger vapour side pressure force measuring device, high back pressure heat exchanger water side entrance temperature measuring device, heat user heat exchanger water side entrance temperature measuring device, heat user heat exchanger water side outlet temperature measuring device, 1 exhaust temperature measuring device of low pressure (LP) cylinder, 2 exhaust temperature measuring device of low pressure (LP) cylinder and pipeline, valve, the latent heat of vaporization is released in condensation after making full use of steam to do work using the present invention, realize outside central heating heat supply, it is horizontal to improve comprehensive utilization of energy.
Description
Technical field
The invention belongs to high back pressure heat supply monitoring and control technologies, and in particular to a kind of highback of large turbine-generator set
Press heat supply and monitoring method and system.
Background technique
Due to miniature boiler heating low efficiency, cause air pollution serious, National Development and Reform Committee, Bureau of Energy etc., which combine, to issue
Cloth " cogeneration of heat and power management method " requires central heating, and large quantities of Thermal generation units carry out cogeneration of heat and power transformation or newly-built thermoelectricity
Coproduction unit.However it is condensed and is released by condenser after the extraction for heat supply formula large turbine-generator set steam acting being widely used
There are a large amount of cold source energies in the latent heat of vaporization.
Summary of the invention
To solve the above-mentioned problems, the high back pressure heat supply and monitoring side the present invention provides a kind of large turbine-generator set
Method and system, specific technical solution are as follows:
A kind of the high back pressure heat supply and monitoring method of large turbine-generator set, comprising the following steps:
S1: it is checked before heat supply:
Generating set is in shutdown status, review and validate with high back pressure heat exchanger, heat user heat exchanger, subsidiary water tank,
Whether each valve event is normal on the connected pipeline of variable frequency pump, and confirms that each valve is in close state, and cross over pipe butterfly valve is complete
It opens；
S2: hot-water supply system water filling operation and inspection:
Generating set is in shutdown status, and the tenth shut-off valve and the 9th shut-off valve standard-sized sheet before and after heat user heat exchanger supplement water
The 8th shut-off valve standard-sized sheet on case aqueduct, the 5th shut-off valve of variable frequency pump front and back, the 6th shut-off valve and the 7th shut-off valve are complete
It opens, third regulating valve is gradually opened, and is filled the water to heat user system, sufficiently starts variable frequency pump after water filling, and gradually promote its turn
Speed checks the leakage situation of pipeline and each valve；
S3: the starting of high back pressure vacuum:
After starting vacuum pump and normal operation, high back pressure heat exchanger vapour side vacuum is made to reach generating set starting service condition；
S4: just starting；
After generating set starting and normal operation, the first shut-off valve of standard-sized sheet, the second shut-off valve and third shut-off valve, monitoring system root
The aperture that the first regulating valve is adjusted according to the test data of heat user heat exchanger water side outlet temperature measuring device keeps heat user hot
The leaving water temperature of exchanger reaches heating demand, when the aperture only by adusting the first regulating valve can not improve heat user heat exchange
When the leaving water temperature of device, monitoring system turns down cross over pipe butterfly valve gradually to improve the leaving water temperature of heat user heat exchanger；
S5: the operating condition of generating set is monitored:
Monitoring system is measured according to high back pressure heat exchanger vapour side pressure force measuring device, high back pressure heat exchanger water side entrance temperature
Device, heat user heat exchanger water side entrance temperature measuring device, heat user heat exchanger water side outlet temperature measuring device
The operating condition of measurement data monitoring generating set；
S6: heating system is stopped transport:
The first regulating valve is gradually turned down, until complete close；First regulating valve closes the first shut-off valve, the second shut-off valve, after exiting
Three shut-off valves；；Generating set is out of service, stops variable frequency pump operation；Third regulating valve is gradually turned down, until complete close；It closes
8th shut-off valve, the 7th shut-off valve, the 6th shut-off valve.
Preferably, the step S5 is specific as follows:
When monitoring system monitors high back pressure heat exchange according to the measurement data of high back pressure heat exchanger vapour side pressure force measuring device
The vapour lateral pressure P of device is higher than setting value PSettingWhen, monitoring system improves heating system water flow velocity by increasing the revolving speed of variable frequency pump
The vapour lateral pressure of high back pressure heat exchanger is set to reach requirement；
If monitoring the vapour lateral pressure P of high back pressure heat exchanger lower than setting value PSettingWhen, monitoring system is by reducing variable frequency pump
Revolving speed improve heating system water flow velocity so that the vapour lateral pressure of high back pressure heat exchanger is reached requirement；
When monitoring system monitors heat user heat according to the measurement data of heat user heat exchanger water side outlet temperature measuring device
The leaving water temperature T of exchangerOutLower than setting value TIt sets outWhen, monitoring system increases heat user by increasing the aperture of the first regulating valve
The input energy of heat exchanger makes the leaving water temperature of heat user heat exchanger reach requirement, and when the first regulating valve standard-sized sheet cannot still make
When the leaving water temperature of heat user heat exchanger is met the requirements, monitoring system then gradually turns the aperture of cross over pipe butterfly valve down；
As the leaving water temperature T for monitoring heat user heat exchangerOutHigher than setting value TIt sets outWhen, monitoring system is adjusted by reducing first
The input energy that the aperture of section valve reduces heat user heat exchanger makes the leaving water temperature of heat user heat exchanger reach requirement；
When monitoring system monitors the measurement temperature of 2 exhaust temperature measuring device of 1 exhaust temperature measuring device of low pressure (LP) cylinder or low pressure (LP) cylinder
Degree is more than threshold value TLow rowWhen, monitoring system opens regulating valve and carries out spray cooling.
A kind of the high back pressure heat supply and monitoring system of large turbine-generator set, the Turbo-generator Set include boiler again
Hot device, high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder；The low pressure (LP) cylinder includes low pressure (LP) cylinder 1, low pressure (LP) cylinder 2, generator；It further include cross over pipe butterfly
Valve, vacuum pump, high back pressure heat exchanger, heat user heat exchanger, subsidiary water tank, variable frequency pump, condensate pump, heat user heat exchange
Device, monitoring system, high back pressure heat exchanger vapour side pressure force measuring device, high back pressure heat exchanger water side entrance temperature measurement dress
It sets, heat user heat exchanger water side entrance temperature measuring device, heat user heat exchanger water side outlet temperature measuring device, low pressure
1 exhaust temperature measuring device of cylinder, 2 exhaust temperature measuring device of low pressure (LP) cylinder and pipeline, valve；
The cross over pipe butterfly valve is arranged on the cross over pipe between intermediate pressure cylinder and low pressure (LP) cylinder, for adjusting heat user heat exchanger vapour
Side pressure of steam supply adjusts the leaving water temperature of heat user heat exchanger by adjusting pressure of steam supply；
The air intake of the high back pressure heat exchanger is connected with exhaust equipment of LP casing, and the water outlet of high back pressure heat exchanger passes through
Pipeline is connect with condensate pump；The condensate pump is for carrying out the water condensed in high back pressure heat exchanger steam chest to be delivered to pot
Furnace reheater keeps the recycling of generating set therrmodynamic system working medium；
The air intake of the heat user heat exchanger passes sequentially through the second shut-off valve, the first regulating valve, the first non-return valve, first section
Only the cross over pipe between valve and the intermediate pressure cylinder and low pressure (LP) cylinder before cross over pipe butterfly valve is connected, and the venthole of heat user heat exchanger is logical
Third shut-off valve is crossed to connect with the steam chest of high back pressure heat exchanger；
The water side entrance of the heat user heat exchanger is connect by the tenth shut-off valve with the water side outlet of high back pressure heat exchanger；
The water side outlet of heat user heat exchanger is connect by the 9th shut-off valve with the water inlet of heat user heat exchanger；The heat user changes
The water outlet of hot device passes sequentially through the 7th shut-off valve, third non-return valve, the 6th shut-off valve and connect with variable frequency pump；The frequency conversion water
Pump passes sequentially through the second non-return valve, the 5th shut-off valve is connect with the water side entrance of high back pressure heat exchanger；
The subsidiary water tank passes sequentially through the 8th shut-off valve, the 4th non-return valve, third regulating valve, the 6th shut-off valve and variable frequency pump
Connection；
The steam chest of the vacuum pump and high back pressure heat exchanger is by pipeline connection, for indoor to high back pressure heat exchanger vapour
Air is aspirated, its vacuum is kept；
The high back pressure heat exchanger vapour side pressure force measuring device is connect with the steam chest of high back pressure heat exchanger, for measuring highback
Press the indoor pressure of heat exchanger vapour；
High back pressure heat exchanger water side entrance temperature measuring device is mounted at the water side entrance of high back pressure heat exchanger, is used
The temperature intake at measurement high back pressure heat exchanger water side entrance；
Heat user heat exchanger water side entrance temperature measuring device is mounted at the water side entrance of heat user heat exchanger, is used
The temperature intake at measurement heat user heat exchanger water side entrance；
The heat user heat exchanger water side outlet temperature measuring device is mounted at the water side outlet of heat user heat exchanger, is used
The temperature being discharged at measurement heat user heat exchanger water side outlet；
The 1 exhaust temperature measuring device of low pressure (LP) cylinder is used to measure the exhaust temperature of low pressure (LP) cylinder 1；
The 2 exhaust temperature measuring device of low pressure (LP) cylinder is used to measure the exhaust temperature of low pressure (LP) cylinder 2；
The monitoring system is for acquiring high back pressure heat exchanger vapour side pressure force measuring device, high back pressure heat exchanger water side entrance
Temperature measuring device, heat user heat exchanger water side entrance temperature measuring device, heat user heat exchanger water side outlet temperature are surveyed
Device, 1 exhaust temperature measuring device of low pressure (LP) cylinder, the measuring signal of 2 exhaust temperature measuring device of low pressure (LP) cylinder are measured, and is believed according to measurement
Number cross over pipe butterfly valve, the first regulating valve, vacuum pump, the second regulating valve, variable frequency pump, third regulating valve are controlled；
The monitoring system respectively with high back pressure heat exchanger vapour side pressure force measuring device, high back pressure heat exchanger water side entrance temperature
Spend measuring device, heat user heat exchanger water side entrance temperature measuring device, the measurement of heat user heat exchanger water side outlet temperature
It is device, 1 exhaust temperature measuring device of low pressure (LP) cylinder, 2 exhaust temperature measuring device of low pressure (LP) cylinder, cross over pipe butterfly valve, the first regulating valve, true
Empty pump, the connection of the second regulating valve, variable frequency pump, third regulating valve.
It preferably, further include the second regulating valve, the 4th shut-off valve, the output end of the condensate pump passes sequentially through the second tune
Section valve, the 4th shut-off valve are connect with low pressure (LP) cylinder.
The invention has the benefit that the invention proposes a kind of high back pressure heat supplies of large turbine-generator set and monitoring
Method and system, the present invention monitors the vapour lateral pressure of high back pressure heat exchanger by monitoring system, heat user heat exchanger goes out
The exhaust temperature of coolant-temperature gage, low pressure (LP) cylinder, the operating condition of auto-control generating set improve generating set operation stability.
The present invention is by will be between the intermediate pressure cylinder and low pressure (LP) cylinder before the air inlet of heat user heat exchanger and cross over pipe butterfly valve
Cross over pipe connection, the gas outlet of heat user heat exchanger is connect with the steam chest of high back pressure heat exchanger and low pressure (LP) cylinder
Exhaust outlet is connect with high back pressure heat exchanger, and the latent heat of vaporization is released in condensation after making full use of steam to do work, and is realized to concentrate outward and be adopted
Warm heat supply, it is horizontal to improve comprehensive utilization of energy.
Detailed description of the invention
Fig. 1 is the high back pressure heat supply of large turbine-generator set a kind of in the present invention and the structural schematic diagram of monitoring system；
Wherein: 1- cross over pipe butterfly valve, the first shut-off valve of 2-, the first non-return valve of 3-, the first regulating valve of 4-, the second shut-off valve of 5-, 6-
Third shut-off valve, 7 vacuum pumps, the 4th shut-off valve of 8-, the second regulating valve of 9-, 10- condensate pump, 11- high back pressure heat exchanger,
12- high back pressure heat exchanger vapour side pressure force measuring device, 13- high back pressure heat exchanger water side entrance temperature measuring device, 14-
Five shut-off valves, the second non-return valve of 15-, 16- variable frequency pump, the 6th shut-off valve of 17-, 18- third non-return valve, the 7th shut-off valve of 19-,
20- heat user heat exchanger, 21- third regulating valve, the 4th non-return valve of 22-, the 8th shut-off valve of 23-, 24- subsidiary water tank, 25- heat are used
Family heat exchanger water side outlet temperature measuring device, the 9th shut-off valve of 26-, 27- heat user heat exchanger, the tenth shut-off valve of 28-,
29- heat user heat exchanger water side entrance temperature measuring device, 2 exhaust temperature measuring device of 30- low pressure (LP) cylinder, 1 row of 31- low pressure (LP) cylinder
Stripping temperature measuring device, 32- monitoring system.
Specific embodiment
In order to better understand the present invention, the present invention will be further explained below with reference to the attached drawings and specific examples:
As shown in Figure 1, a kind of high back pressure heat supply of large turbine-generator set and monitoring system, Turbo-generator Set includes boiler
Reheater, high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder；Low pressure (LP) cylinder includes low pressure (LP) cylinder 1, low pressure (LP) cylinder 2, generator；It further include cross over pipe butterfly valve
1, vacuum pump 7, high back pressure heat exchanger 11, heat user heat exchanger 27, subsidiary water tank 24, variable frequency pump 16, condensate pump 10,
Heat user heat exchanger 20, monitoring system 32, high back pressure heat exchanger vapour side pressure force measuring device 12, high back pressure heat exchanger water side
Inlet temperature measuring device 13, heat user heat exchanger water side entrance temperature measuring device 29, heat user heat exchanger water side go out
Mouth temperature measuring device 25,1 exhaust temperature measuring device 31 of low pressure (LP) cylinder, 2 exhaust temperature measuring device 30 of low pressure (LP) cylinder and pipeline,
Valve；
Cross over pipe butterfly valve 1 is arranged on the cross over pipe between intermediate pressure cylinder and low pressure (LP) cylinder, for adjusting 27 vapour of heat user heat exchanger
Side pressure of steam supply adjusts the leaving water temperature of heat user heat exchanger 27 by adjusting pressure of steam supply；
The air intake of high back pressure heat exchanger 11 is connected with exhaust equipment of LP casing, and the water outlet of high back pressure heat exchanger 11 passes through
Pipeline is connect with condensate pump 10；Condensate pump 10 is for the water condensed in 11 steam chest of high back pressure heat exchanger to be delivered to
Boiler reheater keeps the recycling of generating set therrmodynamic system working medium；The output end of condensate pump 10 passes sequentially through second
Regulating valve 9, the 4th shut-off valve 8 are connect with low pressure (LP) cylinder；
The air intake of heat user heat exchanger 27 passes sequentially through the second shut-off valve 5, the first regulating valve 4, the first non-return valve 3, first
Cross over pipe between shut-off valve 2 and the intermediate pressure cylinder and low pressure (LP) cylinder before cross over pipe butterfly valve 1 is connected, and heat user heat exchanger 27 goes out
Steam ports is connect by third shut-off valve 6 with the steam chest of high back pressure heat exchanger 11；
The water side entrance of heat user heat exchanger 27 is connected by the water side outlet of the tenth shut-off valve 28 and high back pressure heat exchanger 11
It connects；The water side outlet of heat user heat exchanger 27 is connect by the 9th shut-off valve 26 with the water inlet of heat user heat exchanger 20；Heat
The water outlet of user's heat exchanger 20 passes sequentially through the 7th shut-off valve 19, third non-return valve 18, the 6th shut-off valve 17 and variable frequency pump
16 connections；Variable frequency pump 16 passes sequentially through the second non-return valve 15, the water side of the 5th shut-off valve 14 and high back pressure heat exchanger 11 enters
Mouth connection；
Subsidiary water tank 24 passes sequentially through the 8th shut-off valve 23, the 4th non-return valve 22, third regulating valve 21, the 6th shut-off valve 17 and becomes
Frequency water pump 16 connects；
The steam chest of vacuum pump 7 and high back pressure heat exchanger 11 is by pipeline connection, for in 11 steam chest of high back pressure heat exchanger
Air aspirated, keep its vacuum；
High back pressure heat exchanger vapour side pressure force measuring device 12 is connect with the steam chest of high back pressure heat exchanger 11, for measuring highback
Press the indoor pressure of 11 vapour of heat exchanger；
High back pressure heat exchanger water side entrance temperature measuring device 13 is mounted at the water side entrance of high back pressure heat exchanger 11, is used
The temperature intake at measurement 11 water side entrance of high back pressure heat exchanger；
Heat user heat exchanger water side entrance temperature measuring device 29 is mounted at the water side entrance of heat user heat exchanger 27, is used
The temperature intake at measurement 27 water side entrance of heat user heat exchanger；
Heat user heat exchanger water side outlet temperature measuring device 25 is mounted at the water side outlet of heat user heat exchanger 27, is used
The temperature being discharged at measurement 27 water side outlet of heat user heat exchanger；
1 exhaust temperature measuring device 31 of low pressure (LP) cylinder is used to measure the exhaust temperature of low pressure (LP) cylinder 1；
2 exhaust temperature measuring device 30 of low pressure (LP) cylinder is used to measure the exhaust temperature of low pressure (LP) cylinder 2；
Monitoring system 32 is for acquiring high back pressure heat exchanger vapour side pressure force measuring device 12, high back pressure heat exchanger water side entrance
Temperature measuring device 13, heat user heat exchanger water side entrance temperature measuring device 29, heat user heat exchanger water side outlet temperature
Measuring device 25,1 exhaust temperature measuring device 31 of low pressure (LP) cylinder, the measuring signal of 2 exhaust temperature measuring device 30 of low pressure (LP) cylinder are spent, and
Cross over pipe butterfly valve 1, the first regulating valve 4, vacuum pump 7, the second regulating valve 9, variable frequency pump 16, third are adjusted according to measuring signal
Valve 21 is controlled；
Monitoring system 32 respectively with high back pressure heat exchanger vapour side pressure force measuring device 12, high back pressure heat exchanger water side entrance temperature
Spend measuring device 13, heat user heat exchanger water side entrance temperature measuring device 29, heat user heat exchanger water side outlet temperature
Measuring device 25,1 exhaust temperature measuring device 31 of low pressure (LP) cylinder, 2 exhaust temperature measuring device 30 of low pressure (LP) cylinder, cross over pipe butterfly valve 1,
One regulating valve 4, vacuum pump 7, the second regulating valve 9, variable frequency pump 16, third regulating valve 21 connect.
High back pressure heat exchanger water side entrance temperature measuring device 13, heat user heat exchanger water side outlet temperature measurement dress
Set 25, heat user heat exchanger water side entrance temperature measuring device 29,2 exhaust temperature measuring device 30 of low pressure (LP) cylinder, 1 row of low pressure (LP) cylinder
Stripping temperature measuring device 31 respectively includes E type thermocouple.
High back pressure heat exchanger vapour side pressure force measuring device 12 includes EJA series of pressure transmitters.
Condensate pump 10 uses the type tube of NLT350-400 × 6 pouch-type vertical multi-stage centrifugal pump.Vacuum pump 7 uses 2BW4
353-OMK4-Z type liquid-ring vacuum pump.Variable frequency pump 16 uses 1800KLS-23 type vertical diagonal flow pump.Monitoring system (32) is adopted
With OVATION scattered control system；Regulating valve 4,9,21 uses electric control valve；Shut-off valve 2,5,6,8,14,17,19,23,
26,28 bellows stop valve is used；Cross over pipe butterfly valve 1 uses electric butterfly valve；High back pressure heat exchanger 11 and heat user heat exchanger
20 use tubing heat exchanger；Non-return valve 3,15,18,22 uses stainless steel horizontal type non-return valve.
System Working Principle:
The working principle of system: heating system is mainly by the way that the working-medium water circulation of heat user is taken away turbine low pressure cylinder steam discharge
Heat, since the coolant-temperature gage that the working-medium water of heat user is recycled into condenser is higher than environment temperature, thus turbine discharge carry on the back
The back pressure of pressure ratio pure condensed steam device operating condition is high, and steam turbine acting generated energy can be reduced, but turbine discharge condenses the vaporization released
Latent heat is fully used, and improves comprehensive utilization of energy level.The working-medium water of heat user flows through condenser and absorbs steam turbine
After the heat of low pressure (LP) cylinder steam discharge, temperature is not able to satisfy the temperature requirement of heat user, thus from Steam Turbine Through IP Admission and low pressure
Steam extraction is heated at cylinder cross over pipe, adjusts steam extraction amount by cross over pipe butterfly valve 1 when unit load is low；As the working-medium water Hui Ning of heat user
When vapour device inlet temperature is higher, the aperture for turning down the first regulating valve 4 reduces steam extraction amount, and it is defeated to heating system energy to reduce steam extraction
Enter；Condenser vacuum is run by design value, so that the working-medium water of heat user is returned condenser inlet temperature by adjusting steam extraction amount and is being set
Within the scope of evaluation, while the revolving speed of variable frequency pump 16 is adjusted to change the working medium water flow velocity of heat user, reach effectively control condenser
Vacuum.
By taking the subcritical of certain 330MW, a resuperheat, two cylinders, two air exhauster group carry out Heat Supply Engineering application as an example, put down
Equal thermic load is 50 W/m2, corresponding 9,000,000 m of area of heat-supply service2, unit basic parameter is as shown in table 1.
1 thermal power plant unit basic parameter of table
| Parameter | Unit | Numerical value |
| Rated power | MW | 330 |
| Main steam pressure (absolute pressure) | MPa | 17.75 |
| Main steam temperature | ℃ | 540 |
| Reheated steam pressure (absolute pressure) | MPa | 3.72 |
| Reheat steam temperature | ℃ | 540 |
| Intermediate pressure cylinder exhaust steam pressure (absolute pressure) | MPa | 1.02 |
| Intermediate pressure cylinder exhaust temperature | ℃ | 352.1 |
| Working speed | r/min | 3000 |
| High back pressure heat exchanger vapour lateral pressure (absolute pressure) | kPa | 45 |
| High back pressure heat exchanger water side inflow temperature | ℃ | 55 |
| Heat user heat exchanger inflow temperature | ℃ | 75.7 |
| Heat user heat exchanger leaving water temperature | ℃ | 97 |
A kind of the high back pressure heat supply and monitoring method of large turbine-generator set, comprising the following steps:
S1: it is checked before heat supply:
Generating set is in shutdown status, reviews and validate and high back pressure heat exchanger 11, heat user heat exchanger 27, supplement water
Whether each valve event is normal on the connected pipeline of case 24, variable frequency pump 16, and confirms that each valve is in close state, cross over pipe
1 standard-sized sheet of butterfly valve.
S2: hot-water supply system water filling operation and inspection:
Generating set is in shutdown status, 27 the tenth shut-off valve 28 of front and back of heat user heat exchanger and 26 standard-sized sheet of the 9th shut-off valve,
23 standard-sized sheet of the 8th shut-off valve on 24 aqueduct of subsidiary water tank, variable frequency pump 16 front and back the 5th shut-off valve 14, the 6th shut-off valve
17 and 19 standard-sized sheet of the 7th shut-off valve, third regulating valve 21 gradually open, to heat user pipe-line system fill the water, sufficiently water filling after start
Variable frequency pump 16, and its revolving speed is gradually promoted, check the leakage situation of pipeline and each valve.
S3: the starting of high back pressure vacuum:
After starting vacuum pump 7 and normal operation, 11 vapour side vacuum of high back pressure heat exchanger is made to reach generating set starting operation item
Part.
S4: just starting；
After generating set starting and normal operation, standard-sized sheet the first shut-off valve 2, the second shut-off valve 5 and third shut-off valve 6, monitoring system
System 32 adjusts the aperture of the first regulating valve 4 according to the test data of heat user heat exchanger water side outlet temperature measuring device 25,
The leaving water temperature of heat user heat exchanger 27 is set to reach heating demand, when the aperture only by adusting the first regulating valve 4 can not mention
When the leaving water temperature of high heat user heat exchanger 27, monitoring system 32 turns down cross over pipe butterfly valve 1 gradually to improve the friendship of heat user heat
The leaving water temperature of parallel operation 27.
S5: the operating condition of generating set is monitored:
Monitoring system 32 is according to high back pressure heat exchanger vapour side pressure force measuring device 12, high back pressure heat exchanger water side entrance temperature
Measuring device 13, heat user heat exchanger water side entrance temperature measuring device 29, heat user heat exchanger water side outlet temperature are surveyed
Measure the operating condition of the measurement data monitoring generating set of device 25；It is specific as follows:
When monitoring system 32 monitors high back pressure heat according to the measurement data of high back pressure heat exchanger vapour side pressure force measuring device 12
The vapour lateral pressure P of exchanger 11 is higher than setting value PSettingWhen=45 ± 5 kPa, monitoring system 32 is by increasing turning for variable frequency pump 16
Speed, which improves heating system water flow velocity, makes the vapour lateral pressure of high back pressure heat exchanger 11 reach requirement；
If monitoring the vapour lateral pressure P of high back pressure heat exchanger 11 lower than setting value PSettingWhen=45 ± 5 kPa, monitoring system 32 is logical
The revolving speed for crossing reduction variable frequency pump 16, which improves heating system water flow velocity, makes the vapour lateral pressure of high back pressure heat exchanger 11 reach requirement；
When monitoring system 32 monitors hot use according to the measurement data of heat user heat exchanger water side outlet temperature measuring device 25
The leaving water temperature T of family heat exchanger 27OutLower than setting value TIt sets outAt=97 ± 2 DEG C, monitoring system 32 is by increasing the first regulating valve
The input energy that 4 aperture increases heat user heat exchanger 27 makes the leaving water temperature of heat user heat exchanger 27 reach requirement, the
When still the leaving water temperature of heat user heat exchanger 27 cannot be made to meet the requirements when one 4 standard-sized sheet of regulating valve, monitoring system 32 is then gradually
Turn the aperture of cross over pipe butterfly valve 1 down；
As the leaving water temperature T for monitoring heat user heat exchanger 27OutHigher than setting value TIt sets outAt=97 ± 2 DEG C, monitoring system 32 is logical
The input energy for crossing the aperture reduction heat user heat exchanger 27 of the first regulating valve 4 of reduction makes the water outlet of heat user heat exchanger 27
Temperature reaches requirement；
When monitoring system 32 monitors 2 exhaust temperature measuring device 30 of 1 exhaust temperature measuring device 31 of low pressure (LP) cylinder or low pressure (LP) cylinder
Measuring temperature is more than threshold value TLow rowAt=120 DEG C, monitoring system 32 opens regulating valve 9 and carries out spray cooling.
S6: heating system is stopped transport:
The first regulating valve 4 is gradually turned down, until complete close；First regulating valve 4 closes the first shut-off valve 2, the second shut-off valve after exiting
5, third shut-off valve 6；；Generating set is out of service, stops variable frequency pump 16 and runs；Third regulating valve 21 is gradually turned down, until
Quan Guan；Close the 8th shut-off valve 23, the 7th shut-off valve 19, the 6th shut-off valve 17.
The present invention is not limited to above-described specific embodiment, and the foregoing is merely preferable case study on implementation of the invention
, it is not intended to limit the invention, any modification done within the spirit and principles of the present invention and changes equivalent replacement
Into etc., it should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of high back pressure heat supply of large turbine-generator set and monitoring method, it is characterised in that: the following steps are included:
S1: it is checked before heat supply:
Generating set is in shutdown status, reviews and validate and high back pressure heat exchanger (11), heat user heat exchanger (27), benefit
Whether each valve event is normal on the connected pipeline of water-filling case (24), variable frequency pump (16), and confirms that each valve is in and close shape
State, cross over pipe butterfly valve (1) standard-sized sheet；
S2: hot-water supply system water filling operation and inspection:
Generating set is in shutdown status, the tenth shut-off valve (28) and the 9th shut-off valve (26) before and after heat user heat exchanger (27)
Standard-sized sheet, the 8th shut-off valve (23) standard-sized sheet on subsidiary water tank (24) aqueduct, the 5th shut-off valve before and after variable frequency pump (16)
(14), the 6th shut-off valve (17) and the 7th shut-off valve (19) standard-sized sheet, third regulating valve (21) are gradually opened, and are infused to heat user system
Water sufficiently starts variable frequency pump (16) after water filling, and gradually promotes its revolving speed, checks the leakage situation of pipeline and each valve；
S3: the starting of high back pressure vacuum:
After starting vacuum pump (7) and normal operation, high back pressure heat exchanger (11) vapour side vacuum is made to reach generating set starting fortune
Row condition；
S4: just starting；
After generating set starting and normal operation, the first shut-off valve of standard-sized sheet (2), the second shut-off valve (5) and third shut-off valve (6),
Monitoring system (32) adjusts first according to the test data of heat user heat exchanger water side outlet temperature measuring device (25) and adjusts
The aperture of valve (4) makes the leaving water temperature of heat user heat exchanger (27) reach heating demand, when only by adusting the first regulating valve
(4) when aperture can not improve the leaving water temperature of heat user heat exchanger (27), monitoring system (32) gradually turns down cross over pipe butterfly
Valve (1) is to improve the leaving water temperatures of heat user heat exchanger (27)；
S5: the operating condition of generating set is monitored:
Monitoring system (32) is according to high back pressure heat exchanger vapour side pressure force measuring device (12), high back pressure heat exchanger water side entrance
Temperature measuring device (13), heat user heat exchanger water side entrance temperature measuring device (29), heat user heat exchanger water side go out
The operating condition of the measurement data monitoring generating set of mouth temperature measuring device (25)；
S6: heating system is stopped transport:
The first regulating valve (4) are gradually turned down, until complete close；First regulating valve (4) closes the first shut-off valve (2), second after exiting
Shut-off valve (5), third shut-off valve (6)；Generating set is out of service, stops variable frequency pump (16) operation；Gradually turn down third tune
It saves valve (21), until complete close；Close the 8th shut-off valve (23), the 7th shut-off valve (19), the 6th shut-off valve (17).
2. a kind of high back pressure heat supply of large turbine-generator set according to claim 1 and monitoring method, feature exist
In: the step S5 is specific as follows:
When monitoring system (32) monitors highback according to the measurement data of high back pressure heat exchanger vapour side pressure force measuring device (12)
The vapour lateral pressure P of heat exchanger (11) is pressed to be higher than setting value PSettingWhen, monitoring system (32) is by increasing turning for variable frequency pump (16)
Speed, which improves heating system water flow velocity, makes the vapour lateral pressure of high back pressure heat exchanger (11) reach requirement；
If monitoring the vapour lateral pressure P of high back pressure heat exchanger (11) lower than setting value PSettingWhen, monitoring system (32) passes through reduction
The revolving speed of variable frequency pump (16), which improves heating system water flow velocity, makes the vapour lateral pressure of high back pressure heat exchanger (11) reach requirement；
When monitoring system (32) is monitored according to the measurement data of heat user heat exchanger water side outlet temperature measuring device (25)
The leaving water temperature T of heat user heat exchanger (27)OutLower than setting value TIt sets outWhen, monitoring system (32) is by increasing the first regulating valve
(4) input energy that aperture increases heat user heat exchanger (27) reaches the leaving water temperature of heat user heat exchanger (27) to want
It asks, when the first regulating valve (4) standard-sized sheet, cannot still be such that the leaving water temperature of heat user heat exchanger (27) meets the requirements, monitoring system
(32) aperture of cross over pipe butterfly valve (1) is then gradually turned down；
As the leaving water temperature T for monitoring heat user heat exchanger (27)OutHigher than setting value TIt sets outWhen, monitoring system (32) is by subtracting
The input energy that the aperture of small first regulating valve (4) reduces heat user heat exchanger (27) makes going out for heat user heat exchanger (27)
Coolant-temperature gage reaches requirement；
When monitoring system (32) monitors 1 exhaust temperature measuring device (31) of low pressure (LP) cylinder or 2 exhaust temperature measuring device of low pressure (LP) cylinder
(30) measurement temperature is more than TLow rowWhen, monitoring system (32) opens regulating valve (9) and carries out spray cooling.
3. a kind of high back pressure heat supply of large turbine-generator set and monitoring system, the Turbo-generator Set includes boiler reheating
Device, high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder；The low pressure (LP) cylinder includes low pressure (LP) cylinder 1, low pressure (LP) cylinder 2, generator；It is characterized by: also wrapping
Include cross over pipe butterfly valve (1), vacuum pump (7), high back pressure heat exchanger (11), heat user heat exchanger (27), subsidiary water tank (24),
Variable frequency pump (16), condensate pump (10), heat user heat exchanger (20), monitoring system (32), high back pressure heat exchanger vapour side pressure
Force measuring device (12), high back pressure heat exchanger water side entrance temperature measuring device (13), heat user heat exchanger water side entrance
Temperature measuring device (29), heat user heat exchanger water side outlet temperature measuring device (25), 1 exhaust temperature of low pressure (LP) cylinder measurement dress
Set (31), 2 exhaust temperature measuring device (30) of low pressure (LP) cylinder and pipeline, valve；
The cross over pipe butterfly valve (1) is arranged on the cross over pipe between intermediate pressure cylinder and low pressure (LP) cylinder, for adjusting heat user heat exchange
Device (27) vapour side pressure of steam supply adjusts the leaving water temperature of heat user heat exchanger (27) by adjusting pressure of steam supply；
The air intake of the high back pressure heat exchanger (11) is connected with exhaust equipment of LP casing, and high back pressure heat exchanger (11) goes out
The mouth of a river is connect by pipeline with condensate pump (10)；The condensate pump (10) is used for will be in high back pressure heat exchanger (11) steam chest
The water of condensation carries out being delivered to boiler reheater, keeps the recycling of generating set therrmodynamic system working medium；
The air intake of the heat user heat exchanger (27) passes sequentially through the second shut-off valve (5), the first regulating valve (4), first inverse
Only valve (3), the first shut-off valve (2) are connected with the cross over pipe between the intermediate pressure cylinder and low pressure (LP) cylinder before cross over pipe butterfly valve (1), and heat is used
The venthole of family heat exchanger (27) is connect by third shut-off valve (6) with the steam chest of high back pressure heat exchanger (11)；
The water side entrance of the heat user heat exchanger (27) passes through the tenth shut-off valve (28) and high back pressure heat exchanger (11)
The connection of water side outlet；The water side outlet of heat user heat exchanger (27) passes through the 9th shut-off valve (26) and heat user heat exchanger (20)
Water inlet connection；The water outlet of the heat user heat exchanger (20) passes sequentially through the 7th shut-off valve (19), third non-return valve
(18), the 6th shut-off valve (17) is connect with variable frequency pump (16)；The variable frequency pump (16) pass sequentially through the second non-return valve (15),
5th shut-off valve (14) is connect with the water side entrance of high back pressure heat exchanger (11)；
The subsidiary water tank (24) passes sequentially through the 8th shut-off valve (23), the 4th non-return valve (22), third regulating valve (21), the 6th
Shut-off valve (17) is connect with variable frequency pump (16)；
The steam chest of the vacuum pump (7) and high back pressure heat exchanger (11) is by pipeline connection, for high back pressure heat exchanger
(11) the indoor air of vapour is aspirated, and keeps its vacuum；
The high back pressure heat exchanger vapour side pressure force measuring device (12) connect with the steam chest of high back pressure heat exchanger (11), is used for
Measure the indoor pressure of high back pressure heat exchanger (11) vapour；
The high back pressure heat exchanger water side entrance temperature measuring device (13) is mounted on the water side of high back pressure heat exchanger (11)
Inlet, for measuring the temperature intake at high back pressure heat exchanger (11) water side entrance；
The heat user heat exchanger water side entrance temperature measuring device (29) is mounted on the water side of heat user heat exchanger (27)
Inlet, for measuring the temperature intake at heat user heat exchanger (27) water side entrance；
The heat user heat exchanger water side outlet temperature measuring device (25) is mounted on the water side of heat user heat exchanger (27)
Exit, for measuring the temperature being discharged at heat user heat exchanger (27) water side outlet；
The 1 exhaust temperature measuring device (31) of low pressure (LP) cylinder is used to measure the exhaust temperature of low pressure (LP) cylinder 1；
The 2 exhaust temperature measuring device (30) of low pressure (LP) cylinder is used to measure the exhaust temperature of low pressure (LP) cylinder 2；
The monitoring system (32) is for acquiring high back pressure heat exchanger vapour side pressure force measuring device (12), high back pressure heat exchanger
Water side entrance temperature measuring device (13), heat user heat exchanger water side entrance temperature measuring device (29), heat user heat exchange
Device water side outlet temperature measuring device (25), 1 exhaust temperature measuring device (31) of low pressure (LP) cylinder, 2 exhaust temperature of low pressure (LP) cylinder measurement dress
The measuring signal of (30) is set, and cross over pipe butterfly valve (1), the first regulating valve (4), vacuum pump (7), second are adjusted according to measuring signal
Section valve (9), variable frequency pump (16), third regulating valve (21) are controlled；
The monitoring system (32) respectively with high back pressure heat exchanger vapour side pressure force measuring device (12), high back pressure heat exchanger water
Side entrance temperature measuring device (13), heat user heat exchanger water side entrance temperature measuring device (29), heat user heat exchanger
Water side outlet temperature measuring device (25), 1 exhaust temperature measuring device (31) of low pressure (LP) cylinder, 2 exhaust temperature measuring device of low pressure (LP) cylinder
(30), cross over pipe butterfly valve (1), the first regulating valve (4), vacuum pump (7), the second regulating valve (9), variable frequency pump (16), third tune
Save valve (21) connection.
4. a kind of high back pressure heat supply of large turbine-generator set according to claim 3 and monitoring system, feature exist
In: it further include the second regulating valve (9), the 4th shut-off valve (8), the output end of the condensate pump (10) passes sequentially through the second adjusting
Valve (9), the 4th shut-off valve (8) are connect with low pressure (LP) cylinder.
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